6.2.3 Inter-RAT Cell Reselection

38.523-13GPP5GSPart 1: ProtocolRelease 16TSUser Equipment (UE) conformance specification

6.2.3.1 Inter-RAT cell reselection / From E-UTRA_IDLE to NR RRC_IDLE (lower priority & higher priority, Srxlev based)

6.2.3.1.1 Test Purpose (TP)`

(1)

with { UE in E-UTRA RRC_Idle state }

ensure that {

when { UE detects the cell re-selection criteria are met for the cell which belongs to the lower priority inter-RAT NR cell }

then { UE reselects the cell which belongs to the lower priority inter-RAT NR cell }

}

(2)

with { UE in E-UTRA RRC_Idle state }

ensure that {

when { UE detects the cell re-selection criteria are met for the cell which belongs to the higher priority inter-RAT NR cell }

then { UE reselects the cell which belongs to the higher priority inter-RAT NR cell }

}

6.2.3.1.2 Conformance requirements

References: The conformance requirements covered in the present TC are specified in: 3GPP TS 36.304, clause 5.2.4.1, 5.2.4.2 and 5.2.4.5. Unless otherwise stated these are Rel-15 requirements.

[TS 36.304, clause 5.2.4.1]

Absolute priorities of different E-UTRAN frequencies or inter-RAT frequencies may be provided to the UE in the system information, in the RRCConnectionRelease message, or by inheriting from another RAT at inter-RAT cell (re)selection. In the case of system information, an E-UTRAN frequency or inter-RAT frequency may be listed without providing a priority (i.e. the field cellReselectionPriority is absent for that frequency). If priorities are provided in dedicated signalling, the UE shall ignore all the priorities provided in system information. If UE is in camped on any cell state, UE shall only apply the priorities provided by system information from current cell, and the UE preserves priorities provided by dedicated signalling and deprioritisationReq received in RRCConnectionReject unless specified otherwise. When the UE in camped normally state, has only dedicated priorities other than for the current frequency, the UE shall consider the current frequency to be the lowest priority frequency (i.e. lower than any of the network configured values). While the UE is camped on a suitable CSG cell in normal coverage, the UE shall always consider the current frequency to be the highest priority frequency (i.e. higher than any of the network configured values), irrespective of any other priority value allocated to this frequency. When the HSDN capable UE is in High-mobility state, the UE shall always consider the HSDN cells to be the highest priority (i.e. higher than any other network configured priorities). When the HSDN capable UE is not in High-mobility state, the UE shall always consider HSDN cells to be the lowest priority (i.e. lower than network configured priorities). If the UE capable of sidelink communication is configured to perform sidelink communication and can only perform the sidelink communication while camping on a frequency, the UE may consider that frequency to be the highest priority. If the UE capable of V2X sidelink communication is configured to perform V2X sidelink communication and can only perform the V2X sidelink communication while camping on a frequency, the UE may consider that frequency to be the highest priority. If the UE capable of V2X sidelink communication is configured to perform V2X sidelink communication and can only use pre-configuration while not camping on a frequency, the UE may consider the frequency providing inter-carrier V2X sidelink configuration to be the highest priority. If the UE capable of sidelink discovery is configured to perform Public Safety related sidelink discovery and can only perform the Public Safety related sidelink discovery while camping on a frequency, the UE may consider that frequency to be the highest priority.

NOTE 1: The prioritization among the frequencies which UE considers to be the highest priority frequency is left to UE implementation.

If the UE is capable either of MBMS Service Continuity or of SC-PTM reception and is receiving or interested to receive an MBMS service and can only receive this MBMS service while camping on a frequency on which it is provided, the UE may consider that frequency to be the highest priority during the MBMS session TS 36.300 [2] as long as the two following conditions are fulfilled:

1) Either:

– the UE is capable of MBMS service continuity and the reselected cell is broadcasting SIB13; or

– the UE is capable of SC-PTM reception and the reselected cell is broadcasting SIB20;

2) Either:

– SIB15 of the serving cell indicates for that frequency one or more MBMS SAIs included and associated with that frequency in the MBMS User Service Description (USD) TS 26.346 [22] of this service; or

– SIB15 is not broadcast in the serving cell and that frequency is included in the USD of this service.

If the UE is capable either of MBMS Service Continuity or of SC-PTM reception and is receiving or interested to receive an MBMS service provided on a downlink only MBMS frequency, on a frequency used by dedicated MBMS cells, on a frequency used by FeMBMS/Unicast-mixed cells as defined in TS 36.300 [2], or on a frequency belonging to PLMN different from its registered PLMN, the UE may consider cell reselection candidate frequencies at which it can not receive the MBMS service to be of the lowest priority during the MBMS session TS 36.300 [2], as long as the above mentioned condition 1) is fulfilled for the cell on the MBMS frequency which the UE monitors or this cell broadcasts SIB1-MBMS and as long as the above mentioned condition 2) is fulfilled for the serving cell.

NOTE 2: Example scenarios in which the previous down-prioritisation may be needed concerns the cases where camping is not possible, while the UE can only receive this MBMS frequency when camping on a subset of cell reselection candidate frequencies, e.g. the MBMS frequency is a downlink only carrier, the MBMS frequency is used by dedicated MBMS cells, the MBMS frequency is used by FeMBMS/Unicast-mixed cells TS 36.300 [2], or the MBMS frequency belongs to a PLMN different from UE’s registered PLMN.

If the UE is not capable of MBMS Service Continuity but has knowledge on which frequency an MBMS service of interest is provided, it may consider that frequency to be the highest priority during the MBMS session TS 36.300 [2] as long as the reselected cell is broadcasting SIB13.

If the UE is not capable of MBMS Service Continuity but has knowledge on which downlink only frequency, on which frequency used by dedicated MBMS cells, on which frequency used by FeMBMS/Unicast-mixed cells as defined in TS 36.300 [2] or on which frequency belonging to PLMN different from its registered PLMN an MBMS service of interest is provided, it may consider cell reselection candidate frequencies at which it can not receive the MBMS service to be of the lowest priority during the MBMS session TS 36.300 [2] as long as the cell on the MBMS frequency which the UE monitors is broadcasting SIB13 or SIB1-MBMS.

NOTE 3: The UE considers that the MBMS session is ongoing using the session start and end times as provided by upper layers in the USD i.e. the UE does not verify if the session is indicated on MCCH.

In case UE receives RRCConnectionReject with deprioritisationReq, UE shall consider current carrier frequency and stored frequencies due to the previously received RRCConnectionReject with deprioritisationReq or all the frequencies of EUTRA to be the lowest priority frequency (i.e. lower than any of the network configured values) while T325 is running irrespective of camped RAT. The UE shall delete the stored deprioritisation request(s) when a PLMN selection is performed on request by NAS TS 23.122 [5].

NOTE 4: Connecting to CDMA2000 does not imply PLMN selection.

NOTE 5: UE should search for a higher priority layer for cell reselection as soon as possible after the change of priority. The minimum related performance requirements specified in TS 36.133 [10] are still applicable.

The UE shall delete priorities provided by dedicated signalling when:

– the UE enters a different RRC state; or

– the optional validity time of dedicated priorities (T320) expires; or

– a PLMN selection is performed on request by NAS TS 23.122 [5].

NOTE 6: Equal priorities between RATs are not supported.

The UE shall only perform cell reselection evaluation for E-UTRAN frequencies and inter-RAT frequencies that are given in system information and for which the UE has a priority provided.

The UE shall not consider any black listed cells as candidate for cell reselection.

The UE shall inherit the priorities provided by dedicated signalling and the remaining validity time (i.e., T320 in E-UTRA and NR, T322 in UTRA and T3230 in GERAN), if configured, at inter-RAT cell (re)selection.

NOTE 7: The network may assign dedicated cell reselection priorities for frequencies not configured by system information.

While T360 is running, redistribution target is considered to be the highest priority (i.e. higher than any of the network configured values). UE shall continue to consider the serving frequency as the highest priority until completion of E-UTRAN Inter-frequency Redistribution procedure specified in 5.2.4.10 if triggered on T360 expiry/ stop.

[TS 36.304, clause 5.2.4.2]

For NB-IoT measurement rules for cell re-selection is defined in sub-clause 5.2.4.2.a.

When evaluating Srxlev and Squal of non-serving cells for reselection purposes, the UE shall use parameters provided by the serving cell.

Following rules are used by the UE to limit needed measurements:

– If the serving cell fulfils Srxlev > SIntraSearchP and Squal > SIntraSearchQ, the UE may choose not to perform intra-frequency measurements.

– Otherwise, the UE shall perform intra-frequency measurements.

– The UE shall apply the following rules for E-UTRAN inter-frequencies and inter-RAT frequencies which are indicated in system information and for which the UE has priority provided as defined in 5.2.4.1:

– For an E-UTRAN inter-frequency or inter-RAT frequency with a reselection priority higher than the reselection priority of the current E-UTRA frequency the UE shall perform measurements of higher priority E-UTRAN inter-frequency or inter-RAT frequencies according to TS 36.133 [10].

– For an E-UTRAN inter-frequency with an equal or lower reselection priority than the reselection priority of the current E-UTRA frequency and for inter-RAT frequency with lower reselection priority than the reselection priority of the current E-UTRAN frequency:

– If the serving cell fulfils Srxlev > SnonIntraSearchP and Squal > SnonIntraSearchQ, the UE may choose not to perform measurements of E-UTRAN inter-frequencies or inter-RAT frequency cells of equal or lower priority unless the UE is triggered to measure an E-UTRAN inter-frequency which is configured with redistributionInterFreqInfo.

– Otherwise, the UE shall perform measurements of E-UTRAN inter-frequencies or inter-RAT frequency cells of equal or lower priority according to TS 36.133 [10].

– If the UE supports relaxed monitoring and s-SearchDeltaP is present in SystemInformationBlockType3, the UE may further limit the needed measurements, as specified in sub-clause 5.2.4.12.

[TS 36.304, clause 5.2.4.5]

For NB-IoT inter-frequency cell reselection shall be based on ranking as defined in sub-clause 5.2.4.6.

If threshServingLowQ is provided in SystemInformationBlockType3 and more than 1 second has elapsed since the UE camped on the current serving cell, cell reselection to a cell on a higher priority E-UTRAN frequency or inter-RAT frequency than the serving frequency shall be performed if:

– A cell of a higher priority EUTRAN, NR or UTRAN FDD RAT/ frequency fulfils Squal > ThreshX, HighQ during a time interval TreselectionRAT; or

– A cell of a higher priority UTRAN TDD, GERAN or CDMA2000 RAT/ frequency fulfils Srxlev > ThreshX, HighP during a time interval TreselectionRAT.

Otherwise, cell reselection to a cell on a higher priority E-UTRAN frequency or inter-RAT frequency than the serving frequency shall be performed if:

– A cell of a higher priority RAT/ frequency fulfils Srxlev > ThreshX, HighP during a time interval TreselectionRAT; and

– More than 1 second has elapsed since the UE camped on the current serving cell.

Cell reselection to a cell on an equal priority E-UTRAN frequency shall be based on ranking for Intra-frequency cell reselection as defined in sub-clause 5.2.4.6.

If threshServingLowQ is provided in SystemInformationBlockType3 and more than 1 second has elapsed since the UE camped on the current serving cell, cell reselection to a cell on a lower priority E-UTRAN frequency or inter-RAT frequency than the serving frequency shall be performed if:

– The serving cell fulfils Squal < ThreshServing, LowQ and a cell of a lower priority EUTRAN, NR or UTRAN FDD RAT/ frequency fulfils Squal > ThreshX, LowQ during a time interval TreselectionRAT; or

– The serving cell fulfils Squal < ThreshServing, LowQ and a cell of a lower priority UTRAN TDD, GERAN or CDMA2000 RAT/ frequency fulfils Srxlev > ThreshX, LowP during a time interval TreselectionRAT.

Otherwise, cell reselection to a cell on a lower priority E-UTRAN frequency or inter-RAT frequency than the serving frequency shall be performed if:

– The serving cell fulfils Srxlev < ThreshServing, LowP and a cell of a lower priority RAT/ frequency fulfils Srxlev > ThreshX, LowP during a time interval TreselectionRAT; and

– More than 1 second has elapsed since the UE camped on the current serving cell.

Cell reselection to a higher priority RAT/ frequency shall take precedence over a lower priority RAT/ frequency, if multiple cells of different priorities fulfil the cell reselection criteria.

The UE shall not perform cell reselection to NR or UTRAN FDD cells for which the cell selection criterion S is not fulfilled.

For cdma2000 RATs, Srxlev is equal to -FLOOR(-2 x 10 x log10 Ec/Io) in units of 0.5 dB, as defined in [18], with Ec/Io referring to the value measured from the evaluated cell.

For cdma2000 RATs, ThreshX, HighP and ThreshX, LowP are equal to -1 times the values signalled for the corresponding parameters in the system information.

In all the above criteria the value of TreselectionRAT is scaled when the UE is in the medium or high mobility state as defined in subclause 5.2.4.3.1. If more than one cell meets the above criteria, the UE shall reselect a cell as follows:

– If the highest-priority frequency is an E-UTRAN frequency, a cell ranked as the best cell among the cells on the highest priority frequency(ies) meeting the criteria according to clause 5.2.4.6;

– If the highest-priority frequency is from another RAT, a cell ranked as the best cell among the cells on the highest priority frequency(ies) meeting the criteria of that RAT.

Cell reselection to another RAT, for which Squal based cell reselection parameters are broadcast in system information, shall be performed based on the Squal criteria if the UE supports Squal (RSRQ) based cell reselection to E-UTRAN from all the other RATs provided by system information which UE supports. Otherwise, cell reselection to another RAT shall be performed based on Srxlev criteria.

Cell reselection to NR, for which a cell reselection parameter, q-RxLevMinSUL is broadcast in system information and the UE supports SUL, shall be performed based on Srxlev criteria taking the parameter into account.

6.2.3.1.3 Test description

6.2.3.1.3.1 Pre-test conditions

System Simulator:

– E-UTRA Cell 1, NR Cell 1.

– System information combination 31 as defined in TS 36.508-1 [7] clause 4.4.3.1 is used in E-UTRA Cell.

– System information combination NR-6 as defined in TS 38.508-1 [4] clause 4.4.3.1.3 is used in NR Cell.

UE:

– None.

Preamble:

– With E-UTRA Cell 1 "Non-suitable "Off" cell" and NR Cell 1 "Serving cell" in accordance with TS 38.508-1 [4], Table 6.2.2.1-3, the UE is brought to state 1N-A, RRC_IDLE Connectivity (NR), in accordance with the procedure described in TS 38.508-1 [4], Table 4.5.2.2-2. 5G-GUTI and ngKSI are assigned and security context established.

– the UE is switched-off

– With E-UTRA Cell 1 "Serving cell" and NR Cell 1 "Non-suitable "Off" cell" in accordance with TS 38.508-1 [4], Table 6.2.2.1-3, the UE is brought to state RRC_IDLE using generic procedure parameters Connectivity (E-UTRA/EPC) and Unrestricted nr PDN (On) in accordance with the procedure described in TS 38.508-1 [4], clause 4.5.2. 4G GUTI and eKSI are assigned and security context established.

6.2.3.1.3.2 Test procedure sequence

Table 6.2.3.1.3.2-1/2 illustrate the downlink power levels and other changing parameters to be applied for the cell at various time instants of the test execution. The exact instants on which these values shall be applied are described in the texts in this clause. Row marked "T0" denotes the conditions in the preamble. Configurations marked "T1", "T2" and "T3" are applied at the points indicated in the Main behaviour description in Table 6.2.3.1.3.2-3.

Table 6.2.3.1.3.2-1: Time instances of cell power level and parameter changes for E-UTRA Cell 1 and NR Cell 1 in FR1

Parameter

Unit

E-UTRA

Cell 1

NR

Cell 1

Remark

T0

Cell-specific RS EPRE

dBm/15kHz

-85

The power level values are assigned to ensure UE registered on E-UTRA cell 1

SS/PBCH

SSS EPRE

dBm/SCS

Off

T1

Cell-specific RS EPRE

dBm/15kHz

-95

The power level values are assigned to satisfy both SrxlevNR Cell 1 > Threshx, low and SrxlevE-UTRA Cell 1 < Threshserving, low

SS/PBCH

SSS EPRE

dBm/SCS

-80

T2

Cell-specific RS EPRE

dBm/15kHz

-80

The power level values are assigned to ensure UE registered on E-UTRA cell 1

SS/PBCH

SSS EPRE

dBm/SCS

-95

, SrxlevE-UTRA Cell 1 > Threshx, high

T3

Cell-specific RS EPRE

dBm/15kHz

-95

The Priority and power level values are assigned to satisfy SrxlevNR Cell 1 > Threshx, high

SS/PBCH

SSS EPRE

dBm/SCS

-80

Note1: Power level “Off” is defined in TS 38.508-1 [4] Table 6.2.2.1-3.

Table 6.2.3.1.3.2-2: Time instances of cell power level and parameter changes for E-UTRA Cell 1 and NR Cell 1 in FR2

Parameter

Unit

E-UTRA Cell 1

NRCell 1

Remark

T0

Cell-specific RS EPRE

dBm/15kHz

FFS

The power level values are assigned to ensure UE registered on E-UTRA cell 1

SS/PBCH

SSS EPRE

dBm/SCS

Off

T1

Cell-specific RS EPRE

dBm/15kHz

FFS

The power level values are assigned to satisfy both SrxlevNR Cell 1 > Threshx, low and SrxlevE-UTRA Cell 1 < Threshserving, low

SS/PBCH

SSS EPRE

dBm/SCS

FFS

T2

Cell-specific RS EPRE

dBm/15kHz

FFS

The power level values are assigned to ensure UE registered on E-UTRA cell 1

SS/PBCH

SSS EPRE

dBm/SCS

FFS

, SrxlevE-UTRA Cell 1 > Threshx, high

T3

Cell-specific RS EPRE

dBm/15kHz

FFS

The Priority and power level values are assigned to satisfy SrxlevNR Cell 1 > Threshx, high

SS/PBCH

SSS EPRE

dBm/SCS

FFS

Note1: Power level “Off” is defined in TS 38.508-1 [4] Table 6.2.2.1-3.

Table 6.2.3.1.3.2-3: Main behaviour

St

Procedure

Message Sequence

TP

Verdict

U – S

Message

1

The SS adjusts the E-UTRAN and NR Cell power levels according to row "T1" in table 6.2.3.1.3.2-1/2.

2

Wait for 1 second to allow UE to recognise the change.

3

Check: Does the test result of generic test procedure in TS 38.508-1 [4] Table 4.9.9.2.2-1 indicate that the UE is camped on NR Cell 1?

1

P

4

Void.

5

The SS adjusts the E-UTRAN and NR Cell power levels according to row "T2" in table 6.2.3.1.3.2-1/2.

6

Wait for 1 second to allow UE to recognise the change.

7

The test result of generic test procedure in TS 38.508-1 [4] Table 4.9.7.2.2-1 indicate that the UE is camped on E-UTRAN Cell 1.

8

The SS notifies the UE of change of System Information on E-UTRAN Cell 1.

<–

Paging

9

The SS changes Priority of NR cell 1 in SystemInformationBlockType24. And the systemInfoValueTag in the SystemInformationBlockType1 of E-UTRA Cell 1 is increased.

10

Wait for 6 s for UE to receive system information.

11

The SS re-adjusts the E-UTRAN and NR Cell levels according to row "T3" in table 6.2.3.1.3.2-1/2.

12

Check: Does the test result of generic test procedure in TS 38.508-1 [4] Table 4.9.9.2.2-1 indicate that the UE is camped on NR Cell 1?

2

P

13

Void.

6.2.3.1.3.3 Specific message contents

Table 6.2.3.1.3.3-1: SystemInformationBlockType3 of EUTRA Cell 1 (preamble and all steps, Table 6.2.3.1.3.2-3)

Derivation Path: TS 36.508 [7], Table 4.4.3.3-2

Information Element

Value/remark

Comment

Condition

SystemInformationBlockType3 ::= SEQUENCE {

cellReselectionServingFreqInfo SEQUENCE {

threshServingLow

10

20 dB

}

}

Table 6.2.3.1.3.3-2: SystemInformationBlockType24 of EUTRA Cell 1 (preamble, Table 6.2.3.1.3.2-3)

Derivation path: TS 36.508 [7], Table 4.4.3.3-20

Information Element

Value/Remark

Comment

Condition

SystemInformationBlockType24-r15 ::= SEQUENCE {

carrierFreqListNR-r15 SEQUENCE (SIZE (1..maxFreq)) OF CarrierFreqNR-r15 {

1 entry

CarrierFreqNR-r15[1] SEQUENCE {

entry 1

carrierFreq-r15

Downlink NR ARFCN of SSB for NR Cell 1

cellReselectionPriority-r15

3

threshX-High-r15

20

40 dB

threshX-Low-r15

10

20 dB

}

}

t-ReselectionNR-r15

7

}

Table 6.2.3.1.3.3-3: SIB2 of NR Cell 1(preamble and all steps, Table 6.2.3.1.3.2-3)

Derivation Path: TS 38.508-1 [4], Table 4.6.2-1

Information Element

Value/remark

Comment

Condition

SIB2 ::= SEQUENCE {

cellReselectionServingFreqInfo SEQUENCE {

threshServingLowP

10

20 dB

cellReselectionPriority

3

}

}

Table 6.2.3.1.3.3-4: SIB5 of NR Cell 1(preamble and all steps, Table 6.2.3.1.3.2-3)

Derivation Path: TS 38.508-1 [4], Table 4.6.2-4

Information Element

Value/remark

Comment

Condition

SIB5 ::= SEQUENCE {

carrierFreqListEUTRA SEQUENCE (SIZE (1..maxEUTRA-Carrier)) OF CarrierFreqEUTRA {

1 entry

CarrierFreqEUTRA[1] SEQUENCE {

entry 1

carrierFreq

Downlink EUTRA ARFCN as E-UTRA Cell 1 used

cellReselectionPriority

5

threshX-High

10

20 dB

threshX-Low

20

40 dB

}

}

t-ReselectionEUTRA

7

}

Table 6.2.3.1.3.3-5: Paging (step 8, Table 6.2.3.1.3.2-3)

Derivation path: TS 36.508 [7], Table 4.6.1-7

Information Element

Value/Remark

Comment

Condition

Paging ::= SEQUENCE {

systemInfoModification

True

}

Table 6.2.3.1.3.3-6: SystemInformationBlockType1 of EUTRA Cell 1 (step 9, Table 6.2.3.1.3.2-3)

Derivation Path: TS 36.508 [7], Table 4.4.3.2-3

Information Element

Value/remark

Comment

Condition

SystemInformationBlockType1 ::= SEQUENCE {

systemInfoValueTag

1

Previous value is 0

}

Table 6.2.3.1.3.3-7: SystemInformationBlockType24 of EUTRA Cell 1 (step 9, Table 6.2.3.1.3.2-3)

Derivation path: TS 36.508 [7], Table 4.4.3.3-20

Information Element

Value/Remark

Comment

Condition

SystemInformationBlockType24-r15 ::= SEQUENCE {

carrierFreqListNR-r15 SEQUENCE (SIZE (1..maxFreq)) OF CarrierFreqNR-r15 {

1 entry

CarrierFreqNR-r15[1] SEQUENCE {

entry 1

carrierFreq-r15

Same downlink SSB ARFCN as used for NR Cell 1

cellReselectionPriority-r15

5

threshX-High-r15

10

20 dB

threshX-Low-r15

20

40 dB

}

}

t-ReselectionNR-r15

7

7 Seconds

}

Table 6.2.3.1.3.3-8: TRACKING AREA UPDATE REQUEST (Step 7, Table 6.2.3.1.3.2-3)

Derivation Path: TS 38.508-1 [4], Table 4.9.7.2.3-1

Information Element

Value/remark

Comment

Condition

EPS update type

EPS update type Value

‘010’B

Combined TA/LA updating

combined_TA_LA

‘000’B

TA updating

TA_only

NOTE: The message shall be integrity protected using the 5GS security context available in the UE.

Condition

Explanation

TA_only

This condition applies if the UE is configured to initiate EPS attach or if explicitly specified.

combined_TA_LA

This condition applies if the UE is configured to initiate combined EPS/IMSI attach or if explicitly specified.

Table 6.2.3.1.3.3-9: REGISTRATION REQUEST (Step 12, Table 6.2.3.1.3.2-3)

Derivation Path: TS 38.508-1 [4], Table 4.7.1-6.

Information Element

Value/remark

Comment

Condition

EPS NAS message container

TRACKING AREA UPDATE REQUEST message

See Table 6.2.3.1.3.3-10

Table 6.2.3.1.3.3-10: TRACKING AREA UPDATE REQUEST (Table 6.2.3.1.3.3-9)

Derivation Path: TS 38.508-1 [4], Table 4.9.9.2.3-2 with condition Mapped EPS security context

6.2.3.2 Inter-RAT cell reselection / From E-UTRA_IDLE to NR RRC_IDLE (lower priority & higher priority, Squal based)

6.2.3.2.1 Test Purpose (TP)

(1)

with { UE in E-UTRA RRC_IDLE state }

ensure that {

when { UE detects the cell re-selection criteria are met for the cell which belongs to the lower priority inter-RAT NR cell}

then { UE reselects the cell which belongs to the lower priority inter-RAT NR cell }

}

(2)

with { UE in E-UTRA RRC_IDLE state }

ensure that {

when { UE detects the cell re-selection criteria are met for the cell which belongs to the higher priority inter-RAT NR cell}

then { UE reselects the cell which belongs to the higher priority inter-RAT NR cell }

}

6.2.3.2.2 Conformance requirements

References: The conformance requirements covered in the present TC are specified in: 3GPP TS 36.304, clause 5.2.4.1, 5.2.4.2 and 5.2.4.5. Unless otherwise stated these are Rel-15 requirements.

[TS 36.304, clause 5.2.4.1]

Absolute priorities of different E-UTRAN frequencies or inter-RAT frequencies may be provided to the UE in the system information, in the RRCConnectionRelease message, or by inheriting from another RAT at inter-RAT cell (re)selection. In the case of system information, an E-UTRAN frequency or inter-RAT frequency may be listed without providing a priority (i.e. the field cellReselectionPriority is absent for that frequency). If priorities are provided in dedicated signalling, the UE shall ignore all the priorities provided in system information. If UE is in camped on any cell state, UE shall only apply the priorities provided by system information from current cell, and the UE preserves priorities provided by dedicated signalling and deprioritisationReq received in RRCConnectionReject unless specified otherwise. When the UE in camped normally state, has only dedicated priorities other than for the current frequency, the UE shall consider the current frequency to be the lowest priority frequency (i.e. lower than any of the network configured values). While the UE is camped on a suitable CSG cell in normal coverage, the UE shall always consider the current frequency to be the highest priority frequency (i.e. higher than any of the network configured values), irrespective of any other priority value allocated to this frequency. When the HSDN capable UE is in High-mobility state, the UE shall always consider the HSDN cells to be the highest priority (i.e. higher than any other network configured priorities). When the HSDN capable UE is not in High-mobility state, the UE shall always consider HSDN cells to be the lowest priority (i.e. lower than network configured priorities). If the UE capable of sidelink communication is configured to perform sidelink communication and can only perform the sidelink communication while camping on a frequency, the UE may consider that frequency to be the highest priority. If the UE capable of V2X sidelink communication is configured to perform V2X sidelink communication and can only perform the V2X sidelink communication while camping on a frequency, the UE may consider that frequency to be the highest priority. If the UE capable of V2X sidelink communication is configured to perform V2X sidelink communication and can only use pre-configuration while not camping on a frequency, the UE may consider the frequency providing inter-carrier V2X sidelink configuration to be the highest priority. If the UE capable of sidelink discovery is configured to perform Public Safety related sidelink discovery and can only perform the Public Safety related sidelink discovery while camping on a frequency, the UE may consider that frequency to be the highest priority.

NOTE 1: The prioritization among the frequencies which UE considers to be the highest priority frequency is left to UE implementation.

If the UE is capable either of MBMS Service Continuity or of SC-PTM reception and is receiving or interested to receive an MBMS service and can only receive this MBMS service while camping on a frequency on which it is provided, the UE may consider that frequency to be the highest priority during the MBMS session TS 36.300 [2] as long as the two following conditions are fulfilled:

1) Either:

– the UE is capable of MBMS service continuity and the reselected cell is broadcasting SIB13; or

– the UE is capable of SC-PTM reception and the reselected cell is broadcasting SIB20;

2) Either:

– SIB15 of the serving cell indicates for that frequency one or more MBMS SAIs included and associated with that frequency in the MBMS User Service Description (USD) TS 26.346 [22] of this service; or

– SIB15 is not broadcast in the serving cell and that frequency is included in the USD of this service.

If the UE is capable either of MBMS Service Continuity or of SC-PTM reception and is receiving or interested to receive an MBMS service provided on a downlink only MBMS frequency, on a frequency used by dedicated MBMS cells, on a frequency used by FeMBMS/Unicast-mixed cells as defined in TS 36.300 [2], or on a frequency belonging to PLMN different from its registered PLMN, the UE may consider cell reselection candidate frequencies at which it can not receive the MBMS service to be of the lowest priority during the MBMS session TS 36.300 [2], as long as the above mentioned condition 1) is fulfilled for the cell on the MBMS frequency which the UE monitors or this cell broadcasts SIB1-MBMS and as long as the above mentioned condition 2) is fulfilled for the serving cell.

NOTE 2: Example scenarios in which the previous down-prioritisation may be needed concerns the cases where camping is not possible, while the UE can only receive this MBMS frequency when camping on a subset of cell reselection candidate frequencies, e.g. the MBMS frequency is a downlink only carrier, the MBMS frequency is used by dedicated MBMS cells, the MBMS frequency is used by FeMBMS/Unicast-mixed cells TS 36.300 [2], or the MBMS frequency belongs to a PLMN different from UE’s registered PLMN.

If the UE is not capable of MBMS Service Continuity but has knowledge on which frequency an MBMS service of interest is provided, it may consider that frequency to be the highest priority during the MBMS session TS 36.300 [2] as long as the reselected cell is broadcasting SIB13.

If the UE is not capable of MBMS Service Continuity but has knowledge on which downlink only frequency, on which frequency used by dedicated MBMS cells, on which frequency used by FeMBMS/Unicast-mixed cells as defined in TS 36.300 [2] or on which frequency belonging to PLMN different from its registered PLMN an MBMS service of interest is provided, it may consider cell reselection candidate frequencies at which it can not receive the MBMS service to be of the lowest priority during the MBMS session TS 36.300 [2] as long as the cell on the MBMS frequency which the UE monitors is broadcasting SIB13 or SIB1-MBMS.

NOTE 3: The UE considers that the MBMS session is ongoing using the session start and end times as provided by upper layers in the USD i.e. the UE does not verify if the session is indicated on MCCH.

In case UE receives RRCConnectionReject with deprioritisationReq, UE shall consider current carrier frequency and stored frequencies due to the previously received RRCConnectionReject with deprioritisationReq or all the frequencies of EUTRA to be the lowest priority frequency (i.e. lower than any of the network configured values) while T325 is running irrespective of camped RAT. The UE shall delete the stored deprioritisation request(s) when a PLMN selection is performed on request by NAS TS 23.122 [5].

NOTE 4: Connecting to CDMA2000 does not imply PLMN selection.

NOTE 5: UE should search for a higher priority layer for cell reselection as soon as possible after the change of priority. The minimum related performance requirements specified in TS 36.133 [10] are still applicable.

The UE shall delete priorities provided by dedicated signalling when:

– the UE enters a different RRC state; or

– the optional validity time of dedicated priorities (T320) expires; or

– a PLMN selection is performed on request by NAS TS 23.122 [5].

NOTE 6: Equal priorities between RATs are not supported.

The UE shall only perform cell reselection evaluation for E-UTRAN frequencies and inter-RAT frequencies that are given in system information and for which the UE has a priority provided.

The UE shall not consider any black listed cells as candidate for cell reselection.

The UE shall inherit the priorities provided by dedicated signalling and the remaining validity time (i.e., T320 in E-UTRA and NR, T322 in UTRA and T3230 in GERAN), if configured, at inter-RAT cell (re)selection.

NOTE 7: The network may assign dedicated cell reselection priorities for frequencies not configured by system information.

While T360 is running, redistribution target is considered to be the highest priority (i.e. higher than any of the network configured values). UE shall continue to consider the serving frequency as the highest priority until completion of E-UTRAN Inter-frequency Redistribution procedure specified in 5.2.4.10 if triggered on T360 expiry/ stop.

[TS 36.304, clause 5.2.4.2]

Following rules are used by the UE to limit needed measurements:

– If the serving cell fulfils Srxlev > SIntraSearchP and Squal > SIntraSearchQ, the UE may choose not to perform intra-frequency measurements.

– Otherwise, the UE shall perform intra-frequency measurements.

– The UE shall apply the following rules for NR inter-frequencies and inter-RAT frequencies which are indicated in system information and for which the UE has priority provided as defined in 5.2.4.1:

– For a NR inter-frequency or inter-RAT frequency with a reselection priority higher than the reselection priority of the current NR frequency, the UE shall perform measurements of higher priority NR inter-frequency or inter-RAT frequencies according to TS 38.133 [8].

– For a NR inter-frequency with an equal or lower reselection priority than the reselection priority of the current NR frequency and for inter-RAT frequency with lower reselection priority than the reselection priority of the current NR frequency:

– If the serving cell fulfils Srxlev > SnonIntraSearchP and Squal > SnonIntraSearchQ, the UE may choose not to perform measurements of NR inter-frequencies or inter-RAT frequency cells of equal or lower priority;

– Otherwise, the UE shall perform measurements of NR inter-frequencies or inter-RAT frequency cells of equal or lower priority according to TS 38.133 [8].

[TS 36.304, clause 5.2.4.5]

For NB-IoT inter-frequency cell reselection shall be based on ranking as defined in sub-clause 5.2.4.6.

If threshServingLowQ is provided in SystemInformationBlockType3 and more than 1 second has elapsed since the UE camped on the current serving cell, cell reselection to a cell on a higher priority E-UTRAN frequency or inter-RAT frequency than the serving frequency shall be performed if:

– A cell of a higher priority EUTRAN, NR or UTRAN FDD RAT/ frequency fulfils Squal > ThreshX, HighQ during a time interval TreselectionRAT; or

– A cell of a higher priority UTRAN TDD, GERAN or CDMA2000 RAT/ frequency fulfils Srxlev > ThreshX, HighP during a time interval TreselectionRAT.

Otherwise, cell reselection to a cell on a higher priority E-UTRAN frequency or inter-RAT frequency than the serving frequency shall be performed if:

– A cell of a higher priority RAT/ frequency fulfils Srxlev > ThreshX, HighP during a time interval TreselectionRAT; and

– More than 1 second has elapsed since the UE camped on the current serving cell.

Cell reselection to a cell on an equal priority E-UTRAN frequency shall be based on ranking for Intra-frequency cell reselection as defined in sub-clause 5.2.4.6.

If threshServingLowQ is provided in SystemInformationBlockType3 and more than 1 second has elapsed since the UE camped on the current serving cell, cell reselection to a cell on a lower priority E-UTRAN frequency or inter-RAT frequency than the serving frequency shall be performed if:

– The serving cell fulfils Squal < ThreshServing, LowQ and a cell of a lower priority EUTRAN, NR or UTRAN FDD RAT/ frequency fulfils Squal > ThreshX, LowQ during a time interval TreselectionRAT; or

– The serving cell fulfils Squal < ThreshServing, LowQ and a cell of a lower priority UTRAN TDD, GERAN or CDMA2000 RAT/ frequency fulfils Srxlev > ThreshX, LowP during a time interval TreselectionRAT.

Otherwise, cell reselection to a cell on a lower priority E-UTRAN frequency or inter-RAT frequency than the serving frequency shall be performed if:

– The serving cell fulfils Srxlev < ThreshServing, LowP and a cell of a lower priority RAT/ frequency fulfils Srxlev > ThreshX, LowP during a time interval TreselectionRAT; and

– More than 1 second has elapsed since the UE camped on the current serving cell.

Cell reselection to a higher priority RAT/ frequency shall take precedence over a lower priority RAT/ frequency, if multiple cells of different priorities fulfil the cell reselection criteria.

The UE shall not perform cell reselection to NR or UTRAN FDD cells for which the cell selection criterion S is not fulfilled.

For cdma2000 RATs, Srxlev is equal to -FLOOR(-2 x 10 x log10 Ec/Io) in units of 0.5 dB, as defined in [18], with Ec/Io referring to the value measured from the evaluated cell.

For cdma2000 RATs, ThreshX, HighP and ThreshX, LowP are equal to -1 times the values signalled for the corresponding parameters in the system information.

In all the above criteria the value of TreselectionRAT is scaled when the UE is in the medium or high mobility state as defined in subclause 5.2.4.3.1. If more than one cell meets the above criteria, the UE shall reselect a cell as follows:

– If the highest-priority frequency is an E-UTRAN frequency, a cell ranked as the best cell among the cells on the highest priority frequency(ies) meeting the criteria according to clause 5.2.4.6;

– If the highest-priority frequency is from another RAT, a cell ranked as the best cell among the cells on the highest priority frequency(ies) meeting the criteria of that RAT.

Cell reselection to another RAT, for which Squal based cell reselection parameters are broadcast in system information, shall be performed based on the Squal criteria if the UE supports Squal (RSRQ) based cell reselection to E-UTRAN from all the other RATs provided by system information which UE supports. Otherwise, cell reselection to another RAT shall be performed based on Srxlev criteria.

Cell reselection to NR, for which a cell reselection parameter, q-RxLevMinSUL is broadcast in system information and the UE supports SUL, shall be performed based on Srxlev criteria taking the parameter into account.

6.2.3.2.3 Test description

6.2.3.2.3.1 Pre-test conditions

System Simulator:

– E-UTRA Cell 1 and NR Cell 1.

– System information combination 31 as defined in TS 36.508 [7] clause 4.4.3.1, and message contents defined in clause 4.4.3.3 with QBASED condition is used in E-UTRA cell.

– System information combination NR-6 as defined in TS 38.508-1 [4] clause 4.4.3.1.3, and message contents defined in clause 4.6.1 and clause 4.6.2 with QBASED condition is used in NR Cell.

UE:

None.

Preamble:

With E-UTRA Cell 1 "Non-suitable "Off" cell" and NR Cell 1 "Serving cell" in accordance with TS 38.508-1 [4], Table 6.2.2.1-3, the UE is brought to state 1N-A, RRC_IDLE Connectivity (NR), in accordance with the procedure described in TS 38.508-1 [4], Table 4.5.2.2-2. 5G-GUTI and ngKSI are assigned and security context established.

The UE is switched-off.

With E-UTRA Cell 1 "Serving cell" and NR Cell 1 "Non-suitable "Off" cell" in accordance with TS 38.508-1 [4], Table 6.2.2.1-3, the UE is brought to state RRC_IDLE using generic procedure parameters Connectivity (E-UTRA/EPC) and Unrestricted nr PDN (On) in accordance with the procedure described in TS 38.508-1 [4], clause 4.5.2. 4G-GUTI and eKSI are assigned and security context established.

6.2.3.2.3.2 Test procedure sequence

Table 6.2.3.2.3.2-1/2 illustrate the downlink power levels and other changing parameters to be applied for the cell at various time instants of the test execution. The exact instants on which these values shall be applied are described in the texts in this clause. Configurations marked "T1","T2" and "T3" are applied at the points indicated in the Main behaviour description in Table 6.2.3.2.3.2-3.

Table 6.2.3.2.3.2-1: Time instances of cell power level and parameter changes for E-UTRA Cell and NR Cell in FR1

Parameter

Unit

E-UTRA Cell 1

NR Cell 1

Remark

T1

Cell-specific RS EPRE

dBm/15kHz

-95

The power level values are assignen to ensure UE reselected to NR Cell 1: both Squal ServingCell, E-UTRA Cell1 < ThreshServing, LowQ and SqualnonServingCell, NR Cell1 > ThreshNR Cell1,LowQ

SS/PBCH SSS EPRE

dBm/SCS

-80

RSRQ

dB

-11.46

-11.17

Qqualmin

dB

-20

-25

NocE-UTRA

dBm/15kHz

-95

NocNR

dBm/SCS

-90

T2

Cell-specific RS EPRE

dBm/15kHz

-80

The power level values are assignen to ensure UE reselected back to E-UTRA Cell 1: Squal nonServingCell, E-UTRA Cell1 > ThreshE-UTRA Cell1, HighQ

SS/PBCH SSS EPRE

dBm/SCS

-95

RSRQ

dB

-3.76

-16.98

Qqualmin

dB

-20

-25

NocE-UTRA

dBm/15kHz

-95

NocNR

dBm/SCS

-90

T3

Cell-specific RS EPRE

dBm/15kHz

-95

The power level values are assignen to ensure UE reselected to NR Cell 1: Squal nonServingCell, NR Cell1 > Thresh NR Cell1, HighQ

SS/PBCH SSS EPRE

dBm/SCS

-80

RSRQ

dB

-11.46

-11.17

Qqualmin

dB

-20

-25

NocE-UTRA

dBm/15kHz

-95

NocNR

dBm/SCS

-90

Table 6.2.3.2.3.2-2: Time instances of cell power level and parameter changes for E-UTRA Cell and NR Cell in FR2

Parameter

Unit

E-UTRA Cell 1

NR Cell 1

Remark

T1

Cell-specific RS EPRE

dBm/15kHz

FFS

The power level values are assignen to ensure UE reselected to NR Cell 1: both Squal ServingCell, E-UTRA Cell1 < ThreshServing, LowQ and SqualnonServingCell, NR Cell1 > ThreshNR Cell1,LowQ

SS/PBCH SSS EPRE

dBm/SCS

FFS

RSRQ

dB

FFS

FFS

Qqualmin

dB

-20

-25

NocE-UTRA

dBm/15kHz

FFS

NocNR

dBm/SCS

FFS

T2

Cell-specific RS EPRE

dBm/15kHz

FFS

The power level values are assignen to ensure UE reselected back to E-UTRA Cell 1: Squal nonServingCell, E-UTRA Cell1 > ThreshE-UTRA Cell1, HighQ

SS/PBCH SSS EPRE

dBm/SCS

FFS

RSRQ

dB

FFS

FFS

Qqualmin

dB

-20

-25

NocE-UTRA

dBm/15kHz

FFS

NocNR

dBm/SCS

FFS

T3

Cell-specific RS EPRE

dBm/15kHz

FFS

The power level values are assignen to ensure UE reselected to NR Cell 1: Squal nonServingCell, NR Cell1 > Thresh NR Cell1, HighQ

SS/PBCH SSS EPRE

dBm/SCS

FFS

RSRQ

dB

FFS

FFS

Qqualmin

dB

-20

-25

NocE-UTRA

dBm/15kHz

FFS

NocNR

dBm/SCS

FFS

Table 6.2.3.2.3.2-3: Main behaviour

St

Procedure

Message Sequence

TP

Verdict

U – S

Message

1

The SS changes Cell-specific RS EPRE level for E-UTRA Cell 1 and SS/PBCH SSS EPRE level for NR Cell 1 according to row "T1" in table 6.2.3.2.3.2-1/2.

2

Check: Does the test result of generic test procedure in TS 38.508-1 [4] Table 4.9.9.2.2-1 indicate that the UE is camped on NR Cell 1?

NOTE: This is the first time in this test case that the UE moves from S1 to N1.

1

3

The SS transmits an RRCRelease message on NR Cell 1.

<–

NR RRC: RRCRelease

4

The SS changes Cell-specific RS EPRE level for E-UTRA Cell 1 and SS/PBCH SSS EPRE level for NR Cell 1 according to row "T2" in table 6.2.3.2.3.2-1/2.

5

The UE selects E-UTRAN Cell 1 and performs the generic test procedure in TS 38.508-1 [4] Table 4.9.7.2.2 from steps 1-6.

6

The SS transmits an RRCConnectionRelease message to release RRC connection and move to RRC_IDLE on E-UTRAN Cell 1.

<–

E-UTRA RRC: RRCConnectionRelease

7

The SS changes the NR cell priority broadcast in system information on E-UTRAN Cell 1.

8

Notify UE change of System Information on E-UTRAN Cell 1.

<–

E-UTRA RRC: Paging

9

Wait for 6 s for UE to receive system information.

10

The SS changes Cell-specific RS EPRE level for E-UTRA Cell 1 and SS/PBCH SSS EPRE level for NR Cell 1 according to row "T3" in table 6.2.3.2.3.2-1/2.

11

Check: Does the test result of generic test procedure in TS 38.508-1 [4] Table 4.9.9.2.2-1 indicate that the UE is camped on NR Cell 1?

2

12

Void.

6.2.3.2.3.3 Specific message contents

Table 6.2.3.2.3.3-1: SystemInformationBlockType1 for E-UTRA Cell 1 (preamble and all steps, Table 6.2.3.2.3.2-3)

Derivation path: TS 36.508-1 [7], Table 4.4.3.2-3

Information Element

Value/Remark

Comment

Condition

SystemInformationBlockType1 ::= SEQUENCE {

nonCriticalExtension SEQUENCE {

nonCriticalExtension SEQUENCE {

cellSelectionInfo-v920 SEQUENCE {

q-QualMin-r9

-20

}

}

}

}

Table 6.2.3.2.3.3-2:SystemInformationBlockType3 for E-UTRA Cell 1 (preamble and all steps, Table 6.2.3.2.3.2-3)

Derivation path: TS 36.508 [7], Table 4.4.3.3-2

Information Element

Value/Remark

Comment

Condition

SystemInformationBlockType3 ::= SEQUENCE {

lateNonCriticalExtension {

q-QualMin-r9

-20

threshServingLowQ-r9

12

}

}

Table 6.2.3.2.3.3-3:SystemInformationBlockType24 for E-UTRA Cell 1 (preamble, Table 6.2.3.2.3.2-3)

Derivation path: TS 36.508 [7], Table 4.4.3.3-20

Information Element

Value/remark

Comment

Condition

SystemInformationBlockType24-r15 ::= SEQUENCE {

carrierFreqListNR-r15 SEQUENCE (SIZE (1..maxFreq)) OF CarrierFreqNR-r15 {

1 entry

CarrierFreqNR-r15[1] SEQUENCE {

entry 1

carrierFreq-r15

Downlink NR ARFCN of SSB for NR Cell 1

cellReselectionPriority-r15

3

threshX-Q-r15 SEQUENCE {

threshX-HighQ-r15

20

threshX-LowQ-r15

5

}

q-QualMin-r15

-25

}

}

t-ReselectionNR-r15

7

}

Table 6.2.3.2.3.3-4:SIB1 for NR Cell 1 (preamble and all steps, Table 6.2.3.2.3.2-3)

Derivation path: TS 38.508-1 [4], Table 4.6.1-28

Information Element

Value/Remark

Comment

Condition

SIB1 ::= SEQUENCE {

cellSelectionInfo SEQUENCE {

q-QualMin

-25

-25dB

}

}

Table 6.2.3.2.3.3-5:SIB2 for NR Cell 1 (preamble and all steps, Table 6.2.3.2.3.2-3)

Derivation path: TS 38.508-1 [4], Table 4.6.2-1

Information Element

Value/Remark

Comment

Condition

SIB2 ::= SEQUENCE {

cellReselectionServingFreqInfo SEQUENCE {

threshServingLowQ

26

}

}

Table 6.2.3.2.3.3-6:SIB5 for NR Cell 1 (preamble and all steps, Table 6.2.3.2.3.2-3)

Derivation path: TS 38.508-1 [4], Table 4.6.2-4

Information Element

Value/Remark

Comment

Condition

SIB5 ::= SEQUENCE {

carrierFreqListEUTRA SEQUENCE (SIZE (1..maxEUTRA-Carrier)) OF CarrierFreqEUTRA {

1 entry

CarrierFreqEUTRA[1] SEQUENCE {

entry 1

carrierFreq

Downlink EUTRA ARFCN as E-UTRA Cell 1 used

cellReselectionPriority

5

threshX-Q SEQUENCE {

threshX-HighQ

12

threshX-LowQ

5

}

}

}

t-ReselectionEUTRA

7

}

Table 6.2.3.2.3.3-7:SystemInformationBlockType24 for E-UTRA Cell 1 (step 7, Table 6.2.3.2.3.2-3)

Derivation path: TS 36.508 [7], Table 4.4.3.3-20

Information Element

Value/remark

Comment

Condition

SystemInformationBlockType24-r15 ::= SEQUENCE {

carrierFreqListNR-r15 SEQUENCE (SIZE (1..maxFreq)) OF CarrierFreqNR-r15 {

1 entry

CarrierFreqNR-r15[1] SEQUENCE {

entry 1

carrierFreq-r15

Downlink NR ARFCN of SSB for NR Cell 1

cellReselectionPriority-r15

5

threshX-Q-r15 SEQUENCE {

threshX-HighQ-r15

5

threshX-LowQ-r15

20

}

q-QualMin-r15

-25

}

}

t-ReselectionNR-r15

7

}

Table 6.2.3.2.3.3-8: Paging for E-UTRA Cell 1 (step 8, Table 6.2.3.2.3.2-3)

Derivation path: TS 36.508 [7], Table 4.6.1-7

Information Element

Value/Remark

Comment

Condition

Paging ::= SEQUENCE {

pagingRecordList

Not present

systemInfoModification

True

etws-PrimaryNotificationIndication

Not present

nonCriticalExtension

Not present

}

Table 6.2.3.2.3.3-9: SystemInformationBlockType1 for E-UTRA Cell 1 (step 9, Table 6.2.3.2.3.2-3)

Derivation path: TS 36.508-1 [7], Table 4.4.3.2-3

Information Element

Value/Remark

Comment

Condition

SystemInformationBlockType1 ::= SEQUENCE {

systemInfoValueTag

1

}

Table 6.2.3.2.3.3-10: REGISTRATION REQUEST (Step 11, Table 6.2.3.2.3.2-3)

Derivation Path: TS 38.508-1 [4], Table 4.7.1-6.

Information Element

Value/remark

Comment

Condition

EPS NAS message container

TRACKING AREA UPDATE REQUEST message

See Table 6.2.3.2.3.3-11

Table 6.2.3.2.3.3-11: TRACKING AREA UPDATE REQUEST (Table 6.2.3.2.3.3-10)

Derivation Path: TS 38.508-1 [4], Table 4.9.9.2.3-2 with condition Mapped EPS security context

6.2.3.3 Inter-RAT cell reselection / From NR RRC_IDLE to E-UTRA_IDLE (lower priority & higher priority, Srxlev based)

6.2.3.3.1 Test Purpose (TP)

(1)

with { UE in NR RRC_Idle state }

ensure that {

when { UE detects the cell re-selection criteria are met for the cell which belongs to the higher priority E-UTRA frequency }

then { UE reselects to the E-UTRA cell }

}

(2)

with { UE in NR RRC_Idle state }

ensure that {

when { UE detects the cell re-selection criteria are met for the neighour cell which belongs to the lower priority E-UTRA frequency }

then { UE reselects to the E-UTRA cell }

}

6.2.3.3.2 Conformance requirements

References: The conformance requirements covered in the present TC are specified in: 3GPP TS 38.304, clause 5.2.4.1, 5.2.4.2 and 5.2.4.5. Unless otherwise stated these are Rel-15 requirements.

[TS 38.304, clause 5.2.4.1]

Absolute priorities of different NR frequencies or inter-RAT frequencies may be provided to the UE in the system information, in the RRCRelease message, or by inheriting from another RAT at inter-RAT cell (re)selection. In the case of system information, an NR frequency or inter-RAT frequency may be listed without providing a priority (i.e. the field cellReselectionPriority is absent for that frequency). If priorities are provided in dedicated signalling, the UE shall ignore all the priorities provided in system information. If UE is in camped on any cell state, UE shall only apply the priorities provided by system information from current cell, and the UE preserves priorities provided by dedicated signalling and deprioritisationReq received in RRCRelease unless specified otherwise. When the UE in camped normally state, has only dedicated priorities other than for the current frequency, the UE shall consider the current frequency to be the lowest priority frequency (i.e. lower than any of the network configured values).

The UE shall only perform cell reselection evaluation for NR frequencies and inter-RAT frequencies that are given in system information and for which the UE has a priority provided.

In case UE receives RRCRelease with deprioritisationReq, UE shall consider current frequency and stored frequencies due to the previously received RRCRelease with deprioritisationReq or all the frequencies of NR to be the lowest priority frequency (i.e. lower than any of the network configured values) while T325 is running irrespective of camped RAT. The UE shall delete the stored deprioritisation request(s) when a PLMN selection is performed on request by NAS (TS 23.122 [9]).

NOTE: UE should search for a higher priority layer for cell reselection as soon as possible after the change of priority. The minimum related performance requirements specified in TS 38.133 [8] are still applicable.

The UE shall delete priorities provided by dedicated signalling when:

– the UE enters a different RRC state; or

– the optional validity time of dedicated priorities (T320) expires; or

– a PLMN selection is performed on request by NAS (TS 23.122 [9]).

NOTE 2: Equal priorities between RATs are not supported.

The UE shall not consider any black listed cells as candidate for cell reselection.

The UE shall inherit the priorities provided by dedicated signalling and the remaining validity time (i.e. T320 in NR and E-UTRA), if configured, at inter-RAT cell (re)selection.

NOTE 3: The network may assign dedicated cell reselection priorities for frequencies not configured by system information.

[TS 38.304, clause 5.2.4.1]

Following rules are used by the UE to limit needed measurements:

– If the serving cell fulfils Srxlev > SIntraSearchP and Squal > SIntraSearchQ, the UE may choose not to perform intra-frequency measurements.

– Otherwise, the UE shall perform intra-frequency measurements.

– The UE shall apply the following rules for NR inter-frequencies and inter-RAT frequencies which are indicated in system information and for which the UE has priority provided as defined in 5.2.4.1:

– For a NR inter-frequency or inter-RAT frequency with a reselection priority higher than the reselection priority of the current NR frequency, the UE shall perform measurements of higher priority NR inter-frequency or inter-RAT frequencies according to TS 38.133 [8].

– For a NR inter-frequency with an equal or lower reselection priority than the reselection priority of the current NR frequency and for inter-RAT frequency with lower reselection priority than the reselection priority of the current NR frequency:

– If the serving cell fulfils Srxlev > SnonIntraSearchP and Squal > SnonIntraSearchQ, the UE may choose not to perform measurements of NR inter-frequencies or inter-RAT frequency cells of equal or lower priority;

– Otherwise, the UE shall perform measurements of NR inter-frequencies or inter-RAT frequency cells of equal or lower priority according to TS 38.133 [8].

[TS 38.304, clause 5.2.4.5]

If threshServingLowQ is broadcast in system information and more than 1 second has elapsed since the UE camped on the current serving cell, cell reselection to a cell on a higher priority NR frequency or inter-RAT frequency than the serving frequency shall be performed if:

– A cell of a higher priority NR or EUTRAN RAT/frequency fulfils Squal > ThreshX, HighQ during a time interval TreselectionRAT

Otherwise, cell reselection to a cell on a higher priority NR frequency or inter-RAT frequency than the serving frequency shall be performed if:

– A cell of a higher priority RAT/ frequency fulfils Srxlev > ThreshX, HighP during a time interval TreselectionRAT; and

– More than 1 second has elapsed since the UE camped on the current serving cell.

Cell reselection to a cell on an equal priority NR frequency shall be based on ranking for intra-frequency cell reselection as defined in sub-clause 5.2.4.6.

If threshServingLowQ is broadcast in system information and more than 1 second has elapsed since the UE camped on the current serving cell, cell reselection to a cell on a lower priority NR frequency or inter-RAT frequency than the serving frequency shall be performed if:

– The serving cell fulfils Squal < ThreshServing, LowQ and a cell of a lower priority NR or E-UTRAN RAT/ frequency fulfils Squal > ThreshX, LowQ during a time interval TreselectionRAT.

Otherwise, cell reselection to a cell on a lower priority NR frequency or inter-RAT frequency than the serving frequency shall be performed if:

– The serving cell fulfils Srxlev < ThreshServing, LowP and a cell of a lower priority RAT/ frequency fulfils Srxlev > ThreshX, LowP during a time interval TreselectionRAT; and

– More than 1 second has elapsed since the UE camped on the current serving cell.

Cell reselection to a higher priority RAT/frequency shall take precedence over a lower priority RAT/frequency if multiple cells of different priorities fulfil the cell reselection criteria.

If more than one cell meets the above criteria, the UE shall reselect a cell as follows:

– If the highest-priority frequency is an NR frequency, the highest ranked cell among the cells on the highest priority frequency(ies) meeting the criteria according to clause 5.2.4.6;

– If the highest-priority frequency is from another RAT, the highest ranked cell among the cells on the highest priority frequency(ies) meeting the criteria of that RAT.

6.2.3.3.3 Test description

6.2.3.3.3.1 Pre-test conditions

System Simulator:

– NR Cell 1, E-UTRA Cell 1is different priority inter-RAT Cell.

– System information combination NR-6 as defined in TS 38.508-1 [4] clause 4.4.3.1.3 is used in NR Cell.

– System information combination 31 as defined in TS 36.508-1 [18] clause 4.4.3.1 is used in E-UTRA Cell.

UE:

None.

Preamble:

– With E-UTRA Cell 1 "Serving cell" and NR Cell 1 "Non-suitable "Off" cell" in accordance with TS 38.508-1 [4], Table 6.2.2.1-3, the UE is brought to state RRC_IDLE using generic procedure parameters Connectivity (E-UTRA/EPC) and Unrestricted nr PDN (On) in accordance with the procedure described in TS 38.508-1 [4], clause 4.5.2. 4G GUTI and eKSI are assigned and security context established.

– the UE is switched-off.

– With E-UTRA Cell 1 "Non-suitable "Off" cell" and NR Cell 1 "Serving cell" in accordance with TS 38.508-1 [4], Table 6.2.2.1-3, the UE is brought to state 1N-A, RRC_IDLE Connectivity (NR), in accordance with the procedure described in TS 38.508-1 [4], Table 4.5.2.2-2. 5G-GUTI and ngKSI are assigned and security context established.

6.2.3.3.3.2 Test procedure sequence

Table 6.2.3.3.3.2-1/2 illustrate the downlink power levels and other changing parameters to be applied for the cell at various time instants of the test execution. The exact instants on which these values shall be applied are described in the texts in this clause. Row marked "T0" denotes the conditions in the preamble. Configurations marked "T1", "T2" and "T3" are applied at the points indicated in the Main behaviour description in Table 6.2.3.3.3.2-3.

Table 6.2.3.3.3.2-1: Time instances of cell power level and parameter changes for E-UTRA Cell 1 and NR Cell 1 in FR1

Parameter

Unit

NR

Cell 1

E-UTRA

Cell 1

Remark

T0

Cell-specific RS EPRE

dBm/15kHz

-Off

The power level values are assigned to ensure UE registered on NR Cell 1

SS/PBCH

SSS EPRE

dBm/SCS

-88

T1

Cell-specific RS EPRE

dBm/15kHz

-75

The power level values are assigned to satisfy SrxlevE-UTRA Cell 1> Threshx, high

SS/PBCH

SSS EPRE

dBm/SCS

-95

T2

Cell-specific RS EPRE

dBm/15kHz

-95

The power level values are assigned to ensure UE reselected back to NR Cell 1: both SrxlevE-UTRA Cell 1 < Threshserving, low and SrxlevNR Cell 1 > Threshx, low.

SS/PBCH

SSS EPRE

dBm/SCS

-78

T3

Cell-specific RS EPRE

dBm/15kHz

-75

The power level values are assigned to satisfy both SrxlevNR Cell 1 < Threshserving, low and SrxlevE-UTRA Cell 1 > Threshx, low.

SS/PBCH

SSS EPRE

dBm/SCS

-95

Table 6.2.3.3.3.2-2: Time instances of cell power level and parameter changes for E-UTRA Cell 1 and NR Cell 1 in FR2

Parameter

Unit

NR

Cell 1

E-UTRA

Cell 1

Remark

T0

Cell-specific RS EPRE

dBm/15kHz

-Off

The power level values are assigned to ensure UE registered on NR Cell 1

SS/PBCH

SSS EPRE

dBm/SCS

FFS

T1

Cell-specific RS EPRE

dBm/15kHz

-75

The power level values are assigned to satisfy SrxlevE-UTRA Cell 1> Threshx, high

SS/PBCH

SSS EPRE

dBm/SCS

FFS

T2

Cell-specific RS EPRE

dBm/15kHz

-95

The power level values are assigned to ensure UE reselected back to NR Cell 1: both SrxlevE-UTRA Cell 1 < Threshserving, low and SrxlevNR Cell 1 > Threshx, low.

SS/PBCH

SSS EPRE

dBm/SCS

FFS

T3

Cell-specific RS EPRE

dBm/15kHz

-75

The power level values are assigned to satisfy both SrxlevNR Cell 1 < Threshserving, low and SrxlevE-UTRA Cell 1 > Threshx, low.

SS/PBCH

SSS EPRE

dBm/SCS

FFS

Table 6.2.3.3.3.2-3: Main behaviour

St

Procedure

Message Sequence

TP

Verdict

U – S

Message

1

The SS adjusts the NR and E-UTRAN Cell power levels according to row "T1" in table 6.2.3.3.3.2-1/2.

2

Void

3

Check: Does the test result of generic test procedure in TS 38.508-1 [4] Table 4.9.7.2.2-1 is performed and the UE is camped on E-UTRAN Cell 1?

1

4

The SS adjusts the NR and E-UTRAN Cell power levels according to row "T2" in table 6.2.3.3.3.2-1/2.

5

Void

6

Generic test procedure in TS 38.508-1 [4] Table 4.9.9.2.2-1 take place and UE is camped on NR Cell 1

7

The SS transmits RRCRelease message on NR Cell 1.

<–

NR:RRCRelease

8

The SS notifies the UE of change of System Information on NR Cell 1 by send Short Message on PDCCH using P-RNTI.

<–

NR: ShortMessage

9

The SS changes Priority of E-UTRA cell 1 in the SIB5 of NR Cell 1, The ValueTag of SIB5 in the SIB1 is increased on NR Cell 1.

10

Wait for 2.1* modification period to allow the new system information to take effect.

11

The SS adjusts the NR and E-UTRAN Cell power levels according to row "T3" in table 6.2.3.3.3.2-1/2.

12

Void

13

Check: Does the test result of generic test procedure in TS 38.508-1 [4] Table 4.9.7.2.2-1 is performed and the UE is camped on E-UTRAN Cell 1?

2

6.2.3.3.3.3 Specific message contents

Table 6.2.3.3.3.3-1: SIB2 of NR Cell 1(preamble and all steps, Table 6.2.3.3.3.2-3)

Derivation Path: TS 38.508-1 [4], Table 4.6.2-1

Information Element

Value/remark

Comment

Condition

SIB2 ::= SEQUENCE {

cellReselectionServingFreqInfo SEQUENCE {

threshServingLowP

10

20 dB

}

}

Table 6.2.3.3.3.3-2: SIB5 of NR Cell 1(preamble and all steps, Table 6.2.3.3.3.2-3)

Derivation Path: TS 38.508-1 [4], Table 4.6.2-4

Information Element

Value/remark

Comment

Condition

SIB5 ::= SEQUENCE {

carrierFreqListEUTRA SEQUENCE (SIZE (1..maxEUTRA-Carrier)) OF CarrierFreqEUTRA {

1 entry

CarrierFreqEUTRA[1] SEQUENCE {

entry 1

carrierFreq

Downlink EUTRA ARFCN as E-UTRA Cell 1 used

cellReselectionPriority

5

threshX-High

10

20 dB

threshX-Low

20

40 dB

}

}

t-ReselectionEUTRA

7

7 Seconds

}

Table 6.2.3.3.3.3-3: SystemInformationBlockType3 of EUTRA Cell 1 (preamble and all steps, Table 6.2.3.3.3.2-3)

Derivation Path: TS 36.508 [7], Table 4.4.3.3-2

Information Element

Value/remark

Comment

Condition

SystemInformationBlockType3 ::= SEQUENCE {

cellReselectionServingFreqInfo SEQUENCE {

threshServingLow

10

20 dB

}

Table 6.2.3.3.3.3-4: SystemInformationBlockType24 of EUTRA Cell 1 (preamble and all steps, Table 6.2.3.3.3.2-3)

Derivation path: TS 36.508 [7], Table 4.4.3.3-20

Information Element

Value/Remark

Comment

Condition

SystemInformationBlockType24-r15 ::= SEQUENCE {

carrierFreqListNR-r15 SEQUENCE (SIZE (1..maxFreq)) OF CarrierFreqNR-r15 {

1 entry

CarrierFreqNR-r15[1] SEQUENCE {

entry 1

carrierFreq-r15

Same downlink SSB ARFCN as used for NR Cell 1

cellReselectionPriority-r15

3

threshX-High-r15

20

40 dB

threshX-Low-r15

10

20 dB

}

}

t-ReselectionNR-r15

7

7 Seconds

}

Table 6.2.3.3.3.3-5: SIB5 of NR Cell 1(Step 9, Table 6.2.3.3.3.2-3)

Derivation Path: TS 38.508-1 [4], Table 4.6.2-4

Information Element

Value/remark

Comment

Condition

SIB5 ::= SEQUENCE {

carrierFreqListEUTRA SEQUENCE (SIZE (1..maxEUTRA-Carrier)) OF CarrierFreqEUTRA {

1 entry

CarrierFreqEUTRA[1] SEQUENCE {

entry 1

carrierFreq

Downlink EUTRA ARFCN as E-UTRA Cell 1 used

cellReselectionPriority

3

threshX-High

20

40 dB

threshX-Low

10

20 dB

}

}

t-ReselectionEUTRA

7

7 Seconds

}

Table 6.2.3.3.3.3-6: SIB1 of NR Cell 1 (step 9, Table 6.2.3.3.3.2-3)

Derivation Path: TS 38.508-1 [4], Table 4.6.1-5

Information Element

Value/remark

Comment

Condition

SIB1 ::= SEQUENCE {

si-SchedulingInfo

SI-SchedulingInfo

}

Table 6.2.3.3.3.3-7: SI-SchedulingInfo (si-SchedulingInfo in Table 6.2.3.3.3.3-6)

Derivation Path: TS 38.508-1 [4], Table 4.6.3-130A

Information Element

Value/remark

Comment

Condition

SI-SchedulingInfo ::= SEQUENCE {

schedulingInfoList SEQUENCE (SIZE(1..maxSI-Message)) OF SchedulingInfo {

1 entry

SchedulingInfo[1] SEQUENCE {

entry 1

sib-MappingInfo SEQUENCE (SIZE (1..maxSIB)) OF SIB-TypeInfo {

1 entry

SIB-TypeInfo[1] SEQUENCE {

entry 1

type

sibType5

valueTag

1

}

}

}

}

}

Table 6.2.3.3.3.3-8: TRACKING AREA UPDATE REQUEST (Step 3, Table 6.2.3.3.3.2-3)

Derivation Path: TS 38.508-1 [4], Table 4.9.7.2.3-1 with condition First-N1-to-S1 = TRUE

Table 6.2.3.3.3.3-9: TRACKING AREA UPDATE REQUEST (Step 13, Table 6.2.3.3.3.2-3)

Derivation Path: TS 38.508-1 [4], Table 4.9.7.2.3-1 with condition First-N1-to-S1 = FALSE

Table 6.2.3.3.3.3-10: REGISTRATION REQUEST (Step 6, Table 6.2.3.3.3.2-3)

Derivation Path: TS 38.508-1 [4], Table 4.7.1-6.

Information Element

Value/remark

Comment

Condition

EPS NAS message container

TRACKING AREA UPDATE REQUEST message

See Table 6.2.3.3.3.3-12

Table 6.2.3.3.3.3-11: TRACKING AREA UPDATE REQUEST (Table 6.2.3.3.3.3-10)

Derivation Path: TS 36.508 [2], Table 4.7.2-27.

Information Element

Value/remark

Comment

Condition

EPS update type

EPS update type Value

‘000’B

TA updating

"Active" flag

‘0’B

No bearer establishment requested

NAS key set identifier

NAS key set identifier

the eKSI value for the current mapped EPS security context

TSC

‘1’B

mapped security context

6.2.3.4 Inter-RAT cell reselection / From NR RRC_IDLE to E-UTRA_IDLE (lower priority & higher priority, Squal based)

6.2.3.4.1 Test Purpose (TP)

(1)

with { UE in NR RRC_Idle state }

ensure that {

when { UE detects the cell re-selection criteria are met for the cell which belongs to the lower priority inter-RAT E-UTRA cell }

then { UE reselects the cell which belongs to the lower priority inter-RAT E-UTRA cell }

}

(2)

with { UE in NR RRC_Idle state }

ensure that {

when { UE detects the cell re-selection criteria are met for the cell which belongs to the higher priority inter-RAT E-UTRA cell }

then { UE reselects the cell which belongs to the higher priority inter-RAT E-UTRA cell }

}

6.2.3.4.2 Conformance requirements

References: The conformance requirements covered in the present TC are specified in: 3GPP TS 38.304, clause 5.2.4.1, 5.2.4.2 and 5.2.4.5. Unless otherwise stated these are Rel-15 requirements.

[TS 38.304, clause 5.2.4.1]

Absolute priorities of different NR frequencies or inter-RAT frequencies may be provided to the UE in the system information, in the RRCRelease message, or by inheriting from another RAT at inter-RAT cell (re)selection. In the case of system information, an NR frequency or inter-RAT frequency may be listed without providing a priority (i.e. the field cellReselectionPriority is absent for that frequency). If priorities are provided in dedicated signalling, the UE shall ignore all the priorities provided in system information. If UE is in camped on any cell state, UE shall only apply the priorities provided by system information from current cell, and the UE preserves priorities provided by dedicated signalling and deprioritisationReq received in RRCRelease unless specified otherwise. When the UE in camped normally state, has only dedicated priorities other than for the current frequency, the UE shall consider the current frequency to be the lowest priority frequency (i.e. lower than any of the network configured values).

The UE shall only perform cell reselection evaluation for NR frequencies and inter-RAT frequencies that are given in system information and for which the UE has a priority provided.

In case UE receives RRCRelease with deprioritisationReq, UE shall consider current frequency and stored frequencies due to the previously received RRCRelease with deprioritisationReq or all the frequencies of NR to be the lowest priority frequency (i.e. lower than any of the network configured values) while T325 is running irrespective of camped RAT. The UE shall delete the stored deprioritisation request(s) when a PLMN selection is performed on request by NAS (TS 23.122 [9]).

NOTE: UE should search for a higher priority layer for cell reselection as soon as possible after the change of priority. The minimum related performance requirements specified in TS 38.133 [8] are still applicable.

The UE shall delete priorities provided by dedicated signalling when:

– the UE enters a different RRC state; or

– the optional validity time of dedicated priorities (T320) expires; or

– a PLMN selection is performed on request by NAS (TS 23.122 [9]).

NOTE 2: Equal priorities between RATs are not supported.

The UE shall not consider any black listed cells as candidate for cell reselection.

The UE shall inherit the priorities provided by dedicated signalling and the remaining validity time (i.e. T320 in NR and E-UTRA), if configured, at inter-RAT cell (re)selection.

NOTE 3: The network may assign dedicated cell reselection priorities for frequencies not configured by system information.

[TS 38.304, clause 5.2.4.1]

Following rules are used by the UE to limit needed measurements:

– If the serving cell fulfils Srxlev > SIntraSearchP and Squal > SIntraSearchQ, the UE may choose not to perform intra-frequency measurements.

– Otherwise, the UE shall perform intra-frequency measurements.

– The UE shall apply the following rules for NR inter-frequencies and inter-RAT frequencies which are indicated in system information and for which the UE has priority provided as defined in 5.2.4.1:

– For a NR inter-frequency or inter-RAT frequency with a reselection priority higher than the reselection priority of the current NR frequency, the UE shall perform measurements of higher priority NR inter-frequency or inter-RAT frequencies according to TS 38.133 [8].

– For a NR inter-frequency with an equal or lower reselection priority than the reselection priority of the current NR frequency and for inter-RAT frequency with lower reselection priority than the reselection priority of the current NR frequency:

– If the serving cell fulfils Srxlev > SnonIntraSearchP and Squal > SnonIntraSearchQ, the UE may choose not to perform measurements of NR inter-frequencies or inter-RAT frequency cells of equal or lower priority;

– Otherwise, the UE shall perform measurements of NR inter-frequencies or inter-RAT frequency cells of equal or lower priority according to TS 38.133 [8].

[TS 38.304, clause 5.2.4.5]

If threshServingLowQ is broadcast in system information and more than 1 second has elapsed since the UE camped on the current serving cell, cell reselection to a cell on a higher priority NR frequency or inter-RAT frequency than the serving frequency shall be performed if:

– A cell of a higher priority NR or EUTRAN RAT/frequency fulfils Squal > ThreshX, HighQ during a time interval TreselectionRAT

Otherwise, cell reselection to a cell on a higher priority NR frequency or inter-RAT frequency than the serving frequency shall be performed if:

– A cell of a higher priority RAT/ frequency fulfils Srxlev > ThreshX, HighP during a time interval TreselectionRAT; and

– More than 1 second has elapsed since the UE camped on the current serving cell.

Cell reselection to a cell on an equal priority NR frequency shall be based on ranking for intra-frequency cell reselection as defined in sub-clause 5.2.4.6.

If threshServingLowQ is broadcast in system information and more than 1 second has elapsed since the UE camped on the current serving cell, cell reselection to a cell on a lower priority NR frequency or inter-RAT frequency than the serving frequency shall be performed if:

– The serving cell fulfils Squal < ThreshServing, LowQ and a cell of a lower priority NR or E-UTRAN RAT/ frequency fulfils Squal > ThreshX, LowQ during a time interval TreselectionRAT.

Otherwise, cell reselection to a cell on a lower priority NR frequency or inter-RAT frequency than the serving frequency shall be performed if:

– The serving cell fulfils Srxlev < ThreshServing, LowP and a cell of a lower priority RAT/ frequency fulfils Srxlev > ThreshX, LowP during a time interval TreselectionRAT; and

– More than 1 second has elapsed since the UE camped on the current serving cell.

Cell reselection to a higher priority RAT/frequency shall take precedence over a lower priority RAT/frequency if multiple cells of different priorities fulfil the cell reselection criteria.

If more than one cell meets the above criteria, the UE shall reselect a cell as follows:

– If the highest-priority frequency is an NR frequency, the highest ranked cell among the cells on the highest priority frequency(ies) meeting the criteria according to clause 5.2.4.6;

– If the highest-priority frequency is from another RAT, the highest ranked cell among the cells on the highest priority frequency(ies) meeting the criteria of that RAT.

6.2.3.4.3 Test description

6.2.3.4.3.1 Pre-test conditions

System Simulator:

– NR Cell 1 and E-UTRA Cell 1

– System information combination NR-6 as defined in TS 38.508-1 [7] clause 4.4.3.1, and message contents defined in clause 4.6.1 and clause 4.6.2 with QBASED condition is used in NR cell.

– System information combination 31 as defined in TS 36.508 [7] clause 4.4.3.1, and message contents defined in clause 4.4.3.3 with QBASED condition is used in E-UTRA cell.

UE:

None.

Preamble:

With E-UTRA Cell 1 "Serving cell" and NR Cell 1 "Non-suitable "Off" cell" in accordance with TS 38.508-1 [4], Table 6.2.2.1-3, the UE is brought to state RRC_IDLE using generic procedure parameters Connectivity (E-UTRA/EPC) and Unrestricted nr PDN (On) in accordance with the procedure described in TS 38.508-1 [4], clause 4.5.2. 4G-GUTI and eKSI are assigned and security context established

The UE is switched-off.

With E-UTRA Cell 1 "Non-suitable "Off" cell" and NR Cell 1 "Serving cell" in accordance with TS 38.508-1 [4], Table 6.2.2.1-3, the UE is brought to state 1N-A, RRC_IDLE Connectivity (NR), in accordance with the procedure described in TS 38.508-1 [4], Table 4.5.2.2-2. 5G-GUTI and ngKSI are assigned and security context established..

6.2.3.4.3.2 Test procedure sequence

Table 6.2.3.4.3.2-1/2 illustrate the downlink power levels and other changing parameters to be applied for the cell at various time instants of the test execution. The exact instants on which these values shall be applied are described in the texts in this clause. Configurations marked "T1","T2" and "T3" are applied at the points indicated in the Main behaviour description in Table 6.2.3.4.3.2-3.

Table 6.2.3.4.3.2-1: Time instances of cell power level and parameter changes for NR Cell (FR1)

Parameter

Unit

NR Cell 1

E-UTRA Cell 1

Remark

T1

Cell-specific RS EPRE

dBm/15kHz

-80

The power level values are assigned to ensure UE reselected to E-UTRA Cell 1: both Squal ServingCell, NR Cell1 < ThreshServing, LowQ and SqualnonServingCell, E-UTRA Cell1 > ThreshX, LowQ

SS/PBCH SSS EPRE

dBm/SCS

-95

RSRQ

dB

-21.20

-3.76

Qqualmin

dB

-25

-20

NocE-UTRA

dBm/15kHz

-95

NocNR

dBm/SCS

-85

T2

Cell-specific RS EPRE

dBm/15kHz

-95

The power level values are assigned to ensure UE reselected back to NR Cell 1: Squal nonServingCell, NR Cell1 > ThreshX, HighQ

SS/PBCH SSS EPRE

dBm/SCS

-80

RSRQ

dB

-11.96

-11.46

Qqualmin

dB

-25

-20

NocE-UTRA

dBm/15kHz

-95

NocNR

dBm/SCS

-85

T3

Cell-specific RS EPRE

dBm/15kHz

-80

The power level values are assigned to ensure UE reselected to E-UTRA Cell 1: Squal nonServingCell, E-UTRA Cell1 > ThreshX, HighQ

SS/PBCH SSS EPRE

dBm/SCS

-95

RSRQ

dB

-21.20

-3.76

Qqualmin

dB

-25

-20

NocE-UTRA

dBm/15kHz

-95

NocNR

dBm/SCS

-85

Table 6.2.3.4.3.2-2: Time instances of cell power level and parameter changes for NR Cell (FR2)

Parameter

Unit

NR Cell 1

E-UTRA Cell 1

Remark

T1

Cell-specific RS EPRE

dBm/15kHz

FFS

The power level values are assigned to ensure UE reselected to E-UTRA Cell 1: both Squal ServingCell, NR Cell1 < ThreshServing, LowQ and SqualnonServingCell, E-UTRA Cell1 > ThreshX, LowQ

SS/PBCH SSS EPRE

dBm/SCS

FFS

RSRQ

dB

FFS

FFS

Qqualmin

dB

-25

-20

NocE-UTRA

dBm/15kHz

FFS

NocNR

dBm/SCS

FFS

T2

Cell-specific RS EPRE

dBm/15kHz

FFS

The power level values are assigned to ensure UE reselected back to NR Cell 1: Squal nonServingCell, NR Cell1 > ThreshX, HighQ

SS/PBCH SSS EPRE

dBm/SCS

FFS

RSRQ

dB

FFS

FFS

Qqualmin

dB

-25

-20

NocE-UTRA

dBm/15kHz

FFS

NocNR

dBm/SCS

FFS

T3

Cell-specific RS EPRE

dBm/15kHz

FFS

The power level values are assignee to ensure UE reselected to E-UTRA Cell 1: Squal nonServingCell, E-UTRA Cell1 > ThreshX, HighQ

SS/PBCH SSS EPRE

dBm/SCS

FFS

RSRQ

dB

FFS

FFS

Qqualmin

dB

-25

-20

NocE-UTRA

dBm/15kHz

FFS

NocNR

dBm/SCS

FFS

Table 6.2.3.4.3.2-3: Main behaviour

St

Procedure

Message Sequence

TP

Verdict

U – S

Message

1

The SS changes SS/PBCH SSS EPRE level for NR Cell 1 and Cell-specific RS EPRE level for E-UTRA Cell 1 according to row "T1" in table 6.2.3.4.3.2-1/2/3.

2

Check: Does the test result of test steps 1 to 6 of generic test procedure in TS 38.508-1 [4] Table 4.9.7.2.2 indicate that the UE is camped on E-UTRA Cell 1?

1

3

The SS transmits an RRCConnectionRelease message to release RRC connection and move to RRC_IDLE on E-UTRAN Cell 1.

<–

E-UTRA RRC: RRCConnectionRelease

4

The SS changes SS/PBCH SSS EPRE level for NR Cell 1 and Cell-specific RS EPRE level for E-UTRA Cell 1 according to row "T2" in table 6.2.3.4.3.2-1/2/3.

5

The UE selects NR Cell 1 and performs the generic test procedure in TS 38.508-1 Table 4.9.9.2.2-1 with condition ‘connected without release‘.

6

The SS transmits an RRCRelease message on NR Cell 1.

<–

NR RRC: RRCRelease

7

The SS changes the E-UTRA cell priority broadcast in system information on NR Cell 1.

8

Notify UE change of System Information on NR Cell 1.

<–

NR RRC: ShortMessage

9

Wait for 6 s for UE to receive system information.

10

The SS changes SS/PBCH SSS EPRE level for NR Cell 1 and Cell-specific RS EPRE level for E-UTRA Cell 1 according to row "T3" in table 6.2.3.4.3.2-1/2/3.

11

Check: Does the test result of test steps 1 to 6 of generic test procedure in TS 38.508-1 [4] Table 4.9.7.2.2 indicate that the UE is camped on E-UTRA Cell 1?

2

12

The SS transmits an RRCConnectionRelease message to release RRC connection and move to RRC_IDLE on E-UTRAN Cell 1.

<–

E-UTRA RRC: RRCConnectionRelease

6.2.3.4.3.3 Specific message contents

Table 6.2.3.4.3.3-1:SIB1 for NR Cell 1 (preamble and all steps, Table 6.2.3.4.3.2-3)

Derivation path: TS 38.508-1 [4], Table 4.6.1-28

Information Element

Value/Remark

Comment

Condition

SIB1 ::= SEQUENCE {

cellSelectionInfo SEQUENCE {

q-QualMin

-25

}

}

Table 6.2.3.4.3.3-2:SIB2 for NR Cell 1 (preamble and all steps, Table 6.2.3.4.3.2-3)

Derivation path: TS 38.508-1 [4], Table 4.6.2-1

Information Element

Value/Remark

Comment

Condition

SIB2 ::= SEQUENCE {

cellReselectionServingFreqInfo SEQUENCE {

threshServingLowQ

9

}

Table 6.2.3.4.3.3-3:SIB5 NR Cell 1 (preamble, Table 6.2.3.4.3.2-3)

Derivation path: TS 38.508-1 [4], Table 4.6.2-4

Information Element

Value/remark

Comment

Condition

SIB5 ::= SEQUENCE {

carrierFreqListEUTRA SEQUENCE (SIZE (1..maxEUTRA-Carrier)) OF CarrierFreqEUTRA {

1 entry

CarrierFreqEUTRA[1] SEQUENCE {

entry 1

carrierFreq

Downlink E-UTRA ARFCN for E-UTRA Cell 1

threshX-Q SEQUENCE {

threshX-HighQ

20

threshX-LowQ

10

}

}

}

t-ReselectionEUTRA

7

}

Table 6.2.3.4.3.3-4: SystemInformationBlockType1 for E-UTRA Cell 1 (preamble and all steps, Table 6.2.3.4.3.2-3)

Derivation path: TS 36.508-1 [7], Table 4.4.3.2-3

Information Element

Value/Remark

Comment

Condition

SystemInformationBlockType1 ::= SEQUENCE {

nonCriticalExtension SEQUENCE {

nonCriticalExtension SEQUENCE {

cellSelectionInfo-v920 SEQUENCE {

q-QualMin-r9

-20

}

}

}

}

Table 6.2.3.4.3.3-5:SystemInformationBlockType3 for E-UTRA Cell 1 preamble and all steps, Table 6.2.3.4.3.2-3)

Derivation path: TS 36.508 [7], Table 4.4.3.3-2

Information Element

Value/Remark

Comment

Condition

SystemInformationBlockType3 ::= SEQUENCE {

lateNonCriticalExtension {

q-QualMin-r9

-20

threshServingLowQ-r9

26

}

}

Table 6.2.3.4.3.3-6:SystemInformationBlockType24 for E-UTRA Cell 1 (preamble and all steps, Table 6.2.3.4.3.2-3)

Derivation path: TS 36.508 [7], Table 4.4.3.3-20

Information Element

Value/remark

Comment

Condition

SystemInformationBlockType24-r15 ::= SEQUENCE {

carrierFreqListNR-r15 SEQUENCE (SIZE (1..maxFreq)) OF CarrierFreqNR-r15 {

1 entry

CarrierFreqNR-r15[1] SEQUENCE {

entry 1

carrierFreq-r15

Downlink NR ARFCN of SSB for NR Cell 1

cellReselectionPriority-r15

5

threshX-Q-r15 SEQUENCE {

threshX-HighQ-r15

10

threshX-LowQ-r15

20

}

q-QualMin-r15

-25

}

}

t-ReselectionNR-r15

7

}

Table 6.2.3.4.3.3-7: SIB5 NR Cell 1 (step 7, Table 6.2.3.4.3.2-3)

Derivation path: TS 38.508-1 [4], Table 4.6.2-4

Information Element

Value/remark

Comment

Condition

SIB5 ::= SEQUENCE {

carrierFreqListEUTRA SEQUENCE (SIZE (1..maxEUTRA-Carrier)) OF CarrierFreqEUTRA {

1 entry

CarrierFreqEUTRA[1] SEQUENCE {

entry 1

carrierFreq

Downlink E-UTRA ARFCN for E-UTRA Cell 1

cellReselectionPriority

5

q-QualMin

-20

threshX-Q SEQUENCE {

threshX-HighQ

12

threshX-LowQ

20

}

}

}

t-ReselectionEUTRA

7

}

Table 6.2.3.4.3.3-8: SIB1 of NR Cell 1 (step 9, Table 6.2.3.4.3.2-3)

Derivation Path: TS 38.508-1 [4], Table 4.6.1-5

Information Element

Value/remark

Comment

Condition

SIB1 ::= SEQUENCE {

cellSelectionInfo SEQUENCE {

q-QualMin

-25

}

si-SchedulingInfo

SI-SchedulingInfo

}

Table 6.2.3.4.3.3-9: SI-SchedulingInfo (si-SchedulingInfo in Table 6.2.3.4.3.3-6)

Derivation Path: TS 38.508-1 [4], Table 4.6.3-130A

Information Element

Value/remark

Comment

Condition

SI-SchedulingInfo ::= SEQUENCE {

schedulingInfoList SEQUENCE (SIZE(1..maxSI-Message)) OF SchedulingInfo {

1 entry

SchedulingInfo[1] SEQUENCE {

entry 1

sib-MappingInfo SEQUENCE (SIZE (1..maxSIB)) OF SIB-TypeInfo {

1 entry

SIB-TypeInfo[1] SEQUENCE {

entry 1

type

sibType5

valueTag

1

}

}

}

}

}

Table 6.2.3.4.3.3-10: REGISTRATION REQUEST (Step 5, Table 6.2.3.4.3.2-3)

Derivation Path: TS 38.508-1 [4], Table 4.7.1-6.

Information Element

Value/remark

Comment

Condition

EPS NAS message container

TRACKING AREA UPDATE REQUEST message

See Table 6.2.3.4.3.3-11

Table 6.2.3.4.3.3-11: TRACKING AREA UPDATE REQUEST (Table 6.2.3.4.3.3-10)

Derivation Path: TS 38.508-1 [4], Table 4.9.9.2.3-2 with condition Mapped EPS security context

6.2.3.5 Inter-RAT cell reselection / From NR RRC_IDLE to E-UTRA_IDLE according to RAT priority provided by dedicated signalling (RRCRelease)

6.2.3.5.1 Test Purpose (TP)

(1)

with { UE in NR RRC_IDLE state having received an RRCRelease message including cellReselectionPriorities }

ensure that {

when { UE detects the cell re-selection criteria are met for the cell which belongs to the higher priority RAT }

then { UE reselects the cell which belongs to the higher priority RAT }

}

}

(2)

with { UE in NR RRC_IDLE state having received an RRCRelease message including a cellReselectionPriorities }

ensure that {

when { UE detects the cell re-selection criteria are met for the cell which belongs to the lower priority RAT }

then { UE reselects the cell which belongs to the lower priority RAT }

}

}

(3)

with { UE in NR RRC_IDLE state having received an RRCRelease message including a cellReselectionPriorities }

ensure that {

when { T320 expires }

then { UE reselects a cell by applying the cellReselectionPriority broadcast in the system information }

}

}

(4)

with { UE in NR RRC_IDLE state and reselection priorities have been provided in dedicated signalling }

ensure that {

when { T320 has not expired }

then { The UE shall ignore all the priorities provided in system information, and not perform cell reselection evaluation for NR frequencies and E-UTRA frequencies for which the UE doesn’t have a priority provided }

}

}

6.2.3.5.2 Conformance requirements

References: The conformance requirements covered in the present TC are specified in: 3GPP TS 38.304: clause 5.2.4.1 and 5.2.4.5, 3GPP TS 38.331:clause 5.3.8.3 and 5.3.8.4. Unless otherwise stated these are Rel-15 requirements.

[TS 38.304, clause 5.2.4.1]

Absolute priorities of different NR frequencies or inter-RAT frequencies may be provided to the UE in the system information, in the RRCRelease message, or by inheriting from another RAT at inter-RAT cell (re)selection. In the case of system information, an NR frequency or inter-RAT frequency may be listed without providing a priority (i.e. the field cellReselectionPriority is absent for that frequency). If priorities are provided in dedicated signalling, the UE shall ignore all the priorities provided in system information. If UE is in camped on any cell state, UE shall only apply the priorities provided by system information from current cell, and the UE preserves priorities provided by dedicated signalling and deprioritisationReq received in RRCRelease unless specified otherwise. When the UE in camped normally state, has only dedicated priorities other than for the current frequency, the UE shall consider the current frequency to be the lowest priority frequency (i.e. lower than any of the network configured values).

The UE shall only perform cell reselection evaluation for NR frequencies and inter-RAT frequencies that are given in system information and for which the UE has a priority provided.

In case UE receives RRCRelease with deprioritisationReq, UE shall consider current frequency and stored frequencies due to the previously received RRCRelease with deprioritisationReq or all the frequencies of NR to be the lowest priority frequency (i.e. lower than any of the network configured values) while T325 is running irrespective of camped RAT. The UE shall delete the stored deprioritisation request(s) when a PLMN selection is performed on request by NAS (TS 23.122 [9]).

NOTE: UE should search for a higher priority layer for cell reselection as soon as possible after the change of priority. The minimum related performance requirements specified in TS 38.133 [8] are still applicable.

The UE shall delete priorities provided by dedicated signalling when:

– the UE enters a different RRC state; or

– the optional validity time of dedicated priorities (T320) expires; or

– a PLMN selection is performed on request by NAS (TS 23.122 [9]).

NOTE 2: Equal priorities between RATs are not supported.

The UE shall not consider any black listed cells as candidate for cell reselection.

The UE shall inherit the priorities provided by dedicated signalling and the remaining validity time (i.e. T320 in NR and E-UTRA), if configured, at inter-RAT cell (re)selection.

NOTE 3: The network may assign dedicated cell reselection priorities for frequencies not configured by system information.

[TS 38.304, clause 5.2.4.2]

Following rules are used by the UE to limit needed measurements:

– If the serving cell fulfils Srxlev > SIntraSearchP and Squal > SIntraSearchQ, the UE may choose not to perform intra-frequency measurements.

– Otherwise, the UE shall perform intra-frequency measurements.

– The UE shall apply the following rules for NR inter-frequencies and inter-RAT frequencies which are indicated in system information and for which the UE has priority provided as defined in 5.2.4.1:

– For a NR inter-frequency or inter-RAT frequency with a reselection priority higher than the reselection priority of the current NR frequency, the UE shall perform measurements of higher priority NR inter-frequency or inter-RAT frequencies according to TS 38.133 [8].

– For a NR inter-frequency with an equal or lower reselection priority than the reselection priority of the current NR frequency and for inter-RAT frequency with lower reselection priority than the reselection priority of the current NR frequency:

– If the serving cell fulfils Srxlev > SnonIntraSearchP and Squal > SnonIntraSearchQ, the UE may choose not to perform measurements of NR inter-frequencies or inter-RAT frequency cells of equal or lower priority;

– Otherwise, the UE shall perform measurements of NR inter-frequencies or inter-RAT frequency cells of equal or lower priority according to TS 38.133 [8].

[TS 38.331, clause 5.3.8.3]

The UE shall:

1> delay the following actions defined in this sub-clause 60 ms from the moment the RRCRelease message was received or optionally when lower layers indicate that the receipt of the RRCRelease message has been successfully acknowledged, whichever is earlier;

1> stop timer T380, if running;

1> stop timer T320, if running;

1> if T390 is running:

2> stop timer T390 for all access categories;

2> perform the actions as specified in 5.3.14.4;

1> if the AS security is not activated, perform the actions upon going to RRC_IDLE as specified in 5.3.11 with the release cause ‘other’ upon which the procedure ends;

1> if the RRCRelease message includes redirectedCarrierInfo indicating redirection to eutra:

2> if cnType is included:

3> after the cell selection, indicate the available CN Type(s) and the received cnType to upper layers;

NOTE: Handling the case if the E-UTRA cell selected after the redirection does not support the core network type specified by the cnType, is up to UE implementation.

1> if the RRCRelease message includes the cellReselectionPriorities:

2> store the cell reselection priority information provided by the cellReselectionPriorities;

2> if the t320 is included:

3> start timer T320, with the timer value set according to the value of t320;

1> else:

2> apply the cell reselection priority information broadcast in the system information;

1> if deprioritisationReq is included:

2> start or restart timer T325 with the timer value set to the deprioritisationTimer signalled;

2> store the deprioritisationReq until T325 expiry;

1> if the RRCRelease includes suspendConfig:

2> apply the received suspendConfig;

2> reset MAC and release the default MAC Cell Group configuration, if any;

2> re-establish RLC entities for SRB1;

2> if the RRCRelease message with suspendConfig was received in response to an RRCResumeRequest or an RRCResumeRequest1:

3> stop the timer T319 if running;

3> in the stored UE Inactive AS context:

4> replace the KgNB and KRRCint keys with the current KgNB and KRRCint keys;

4> replace the C-RNTI with the temporary C-RNTI in the cell the UE has received the RRCRelease message;

4> replace the cellIdentity with the cellIdentity of the cell the UE has received the RRCRelease message;

4> replace the physical cell identity with the physical cell identity of the cell the UE has received the RRCRelease message;

4> replace the suspendConfig with the current suspendConfig;

2> else:

3> store in the UE Inactive AS Context the configured suspendConfig, the current KgNB and KRRCint keys, the ROHC state, the C-RNTI used in the source PCell, the cellIdentity and the physical cell identity of the source PCell, and all other parameters configured except with ReconfigurationWithSync;

2> suspend all SRB(s) and DRB(s), except SRB0;

2> indicate PDCP suspend to lower layers of all DRBs;

2> if the t380 is included:

3> start timer T380, with the timer value set to t380;

2> if the RRCRelease message is including the waitTime:

3> start timer T302 with the value set to the waitTime;

3> inform the upper layer that access barring is applicable for all access categories except categories ‘0’ and ‘2’;

2> indicate the suspension of the RRC connection to upper layers;

2> enter RRC_INACTIVE and perform cell selection as specified in TS 38.304 [20];

1> else

2> perform the actions upon going to RRC_IDLE as specified in 5.3.11, with the release cause ‘other’.

[TS 38.331, clause 5.3.8.4]

The UE shall:

1> if T320 expires:

2> if stored, discard the cell reselection priority information provided by the cellReselectionPriorities or inherited from another RAT;

2> apply the cell reselection priority information broadcast in the system information.

6.2.3.5.3 Test description

6.2.3.5.3.1 Pre-test conditions

System Simulator:

– NR Cell 1, E-UTRA Cell 1 is inter-RAT cell.

– System information combination NR-6 as defined in TS 38.508-1 [4] clause 4.4.3.1.3 is used in NR Cell.

– System information combination 31 as defined in TS 36.508-1 [18] clause 4.4.3.1 is used in E-UTRA Cell.

UE:

None.

Preamble:

– With E-UTRA Cell 1 "Serving cell" and NR Cell 1 "Non-suitable "Off" cell" in accordance with TS 38.508-1 [4], Table 6.2.2.1-3, the UE is brought to state RRC_IDLE using generic procedure parameters Connectivity (E-UTRA/EPC) and Unrestricted nr PDN (On) in accordance with the procedure described in TS 38.508-1 [4], clause 4.5.2. 4G GUTI and eKSI are assigned and security context established.

– the UE is switched-off.

– With E-UTRA Cell 1 "Non-suitable "Off" cell" and NR Cell 1 "Serving cell" in accordance with TS 38.508-1 [4], Table 6.2.2.1-3, the UE is brought to state 3N-A, RRC_CONNECTED Connectivity (NR), in accordance with the procedure described in TS 38.508-1 [4], Table 4.5.4.2-3. 5G-GUTI and ngKSI are assigned and security context established.

6.2.3.5.3.2 Test procedure sequence

Table 6.2.3.5.3.2-1/2 illustrate the downlink power levels and other changing parameters to be applied for the cell at various time instants of the test execution. The exact instants on which these values shall be applied are described in the texts in this clause. Row marked "T0" denotes the conditions in the preamble. Configurations marked "T1", "T2" and so on are applied at the points indicated in the Main behaviour description in Table 6.1.3.5.3.2-3.

Table 6.2.3.5.3.2-1: Time instances of cell power level and parameter changes for E-UTRA cell 1 and NR cell 1 in FR1

Parameter

Unit

NR

Cell 1

E-UTRA

Cell 1

Remark

T0

Cell-specific RS EPRE

dBm/15kHz

OFF

The power level values are assigned to satisfy Srxlev NR Cell 1 > 0 and SrxlevE-UTRA Cell 1 < 0. And UE camping on NR Cell 1 is guaranteed.

SS/PBCH

SSS EPRE

dBm/SCS

-88

T1

Cell-specific RS EPRE

dBm/15kHz

-70

The power level values are assigned to satisfy SrxlevE-UTRA cell 1 > Threshx,high.

SS/PBCH

SSS EPRE

dBm/SCS

-90

T2

Cell-specific RS EPRE

dBm/15kHz

-104

The power level values are such that camping on NR Cell 1 is guaranteed.

SS/PBCH

SSS EPRE

dBm/SCS

-78

T3

Cell-specific RS EPRE

dBm/15kHz

-88

The power level values are assigned to satisfy both SrxlevNR Cell 1 < Threshserving, low and SrxlevE-UTRA Cell 1 > Threshx, low.

SS/PBCH

SSS EPRE

dBm/SCS

-104

T4

Cell-specific RS EPRE

dBm/15kHz

-104

The power level values are such that camping on NR Cell 1 is guaranteed.

SS/PBCH

SSS EPRE

dBm/SCS

-78

T5

Cell-specific RS EPRE

dBm/15kHz

-70

The power level values are assigned to satisfy SrxlevNR cell 1 > Threshserving, low and SrxlevE-UTRA cell 1 > Threshx,high.

SS/PBCH

SSS EPRE

dBm/SCS

-90

Table 6.2.3.5.3.2-2: Time instances of cell power level and parameter changes for E-UTRA Cell 1 and NR Cell 1 in FR2

Parameter

Unit

NR

Cell 1

E-UTRA

Cell 1

Remark

T0

Cell-specific RS EPRE

dBm/15kHz

OFF

The power level values are assigned to satisfy Srxlev NR Cell 1 > 0 and SrxlevE-UTRA Cell 1 < 0. And UE camping on NR Cell 1 is guaranteed.

SS/PBCH

SSS EPRE

dBm/SCS

FFS

T1

Cell-specific RS EPRE

dBm/15kHz

-70

The power level values are assigned to satisfy SrxlevE-UTRA cell 1 > Threshx,high.

SS/PBCH

SSS EPRE

dBm/SCS

FFS

T2

Cell-specific RS EPRE

dBm/15kHz

-104

The power level values are such that camping on NR Cell 1 is guaranteed.

SS/PBCH

SSS EPRE

dBm/SCS

FFS

T3

Cell-specific RS EPRE

dBm/15kHz

-88

The power level values are assigned to satisfy both SrxlevNR Cell 1 < Threshserving, low and SrxlevE-UTRA Cell 1 > Threshx, low.

SS/PBCH

SSS EPRE

dBm/SCS

FFS

T4

Cell-specific RS EPRE

dBm/15kHz

-104

The power level values are such that camping on NR Cell 1 is guaranteed.

SS/PBCH

SSS EPRE

dBm/SCS

FFS

T5

Cell-specific RS EPRE

dBm/15kHz

-70

The power level values are assigned to satisfy SrxlevNR cell 1 > Threshserving, low and SrxlevE-UTRA cell 1 > Threshx,high.

SS/PBCH

SSS EPRE

dBm/SCS

FFS

Table 6.2.3.5.3.2-3: Main behaviour

St

Procedure

Message Sequence

TP

Verdict

U – S

Message

1

The SS transmits RRCRelease message including cellReselectionPriorities on NR Cell 1.

NR:RRCRelease

2

The SS adjusts the NR and E-UTRAN Cell power levels according to row "T1" in table 6.2.3.5.3.2-1/2.

3

Check: Does the UE transmit an RRC CONNECTION REQUEST on E-UTRA Cell 1 within the next 30 Seconds?

4

F

4

The test steps 1 to 8 of generic test procedure in TS 38.508-1 [4] Table 4.5.4.2-3 are performed on NR Cell 1.

5

The SS transmits RRCRelease message including cellReselectionPriorities on NR Cell 1.

<–

NR:RRCRelease

6

Check: Does the test result of generic test procedure in TS 38.508-1 [4] Table 4.9.7.2.2-1 is performed and the UE is camped on E-UTRAN Cell 1?

1

7

The SS adjusts the NR and E-UTRAN Cell power levels according to row "T2" in table 6.2.3.5.3.2-1/2.

8

Generic test procedure in TS 38.508-1 [4] Table 4.9.9.2.2-1 take place and the UE is camped on NR Cell 1.

9

The SS adjusts the NR and E-UTRAN Cell power levels according to row "T3" in table 6.2.3.5.3.2-1/2.

10

The SS transmits RRCRelease message including cellReselectionPriorities on NR Cell 1.

<–

NR:RRCRelease

11

Check: Does the test result of generic test procedure in TS 38.508-1 [4] Table 4.9.7.2.2-1 is performed and the UE is camped on E-UTRAN Cell 1?

2

12

The SS adjusts the NR and E-UTRAN Cell power levels according to row "T4" in table 6.2.3.5.3.2-1/2.

13

Generic test procedure in TS 38.508-1 [4] Table 4.9.9.2.2-1 take place and the UE is camped on NR Cell 1.

14

The SS transmits RRCRelease message including cellReselectionPriorities on NR Cell 1.

<–

NR:RRCRelease

15

The SS adjusts the NR and E-UTRAN Cell power levels according to row "T5" in table 6.2.3.5.3.2-1/2.

16

Wait for 5 minutes from step 17 to ensure that T320 expires.

17

Check: Does the test result of generic test procedure in TS 38.508-1 [4] Table 4.9.7.2.2-1 is performed and the UE is camped on E-UTRAN Cell 1?

3

6.2.3.5.3.3 Specific message contents

Table 6.2.3.5.3.3-1: SIB2 of NR Cell 1(preamble and all steps, Table 6.2.3.5.3.2-3)

Derivation Path: TS 38.508-1 [4], Table 4.6.2-1

Information Element

Value/remark

Comment

Condition

SIB2 ::= SEQUENCE {

cellReselectionServingFreqInfo SEQUENCE {

threshServingLowP

5

10dB

}

}

Table 6.2.3.5.3.3-2: SIB5 of NR Cell 1(preamble and all steps, Table 6.2.3.5.3.2-3)

Derivation Path: TS 38.508-1 [4], Table 4.6.2-4

Information Element

Value/remark

Comment

Condition

SIB5 ::= SEQUENCE {

carrierFreqListEUTRA SEQUENCE (SIZE (1..maxEUTRA-Carrier)) OF CarrierFreqEUTRA {

1 entry

CarrierFreqEUTRA[1] SEQUENCE {

entry 1

carrierFreq

Downlink EARFCN as E-UTRA Cell 1 used

cellReselectionPriority

5

threshX-High

13

26 dB

threshX-Low

5

10 dB

}

}

t-ReselectionEUTRA

7

7 Seconds

}

Table 6.2.3.5.3.3-3: SystemInformationBlockType3 for EUTRA Cell 1 (preamble and all steps, Table 6.2.3.5.3.2-3)

Derivation Path: TS 36.508 [7], Table 4.4.3.2

Information Element

Value/remark

Comment

Condition

SystemInformationBlockType3 ::= SEQUENCE {

cellReselectionServingFreqInfo SEQUENCE {

threshServingLow

5

10dB

}

}

Table 6.2.3.5.3.3-4: SystemInformationBlockType24 for EUTRA Cell 1 (preamble and all steps, Table 6.2.3.5.3.2-3)

Derivation path: TS 36.508 [7], Table 4.4.3.3-20

Information Element

Value/Remark

Comment

Condition

SystemInformationBlockType24-r15 ::= SEQUENCE {

carrierFreqListNR-r15 SEQUENCE (SIZE (1..maxFreq)) OF CarrierFreqNR-r15 {

1 entry

CarrierFreqNR-r15[1] SEQUENCE {

entry 1

carrierFreq-r15

Same downlink SSB ARFCN as used for NR Cell 1

cellReselectionPriority-r15

3

threshX-High-r15

20

40dB

threshX-Low-r15

10

20dB

}

}

t-ReselectionNR-r15

7

7 Seconds

}

Table 6.2.3.5.3.3-5 RRCRelease (step1, Table 6.2.3.5.3.2-3)

Derivation Path: TS 38.508-1 [4], Table 4.6.1-16

Information Element

Value/remark

Comment

Condition

RRCRelease ::= SEQUENCE {

criticalExtensions CHOICE {

rrcRelease SEQUENCE {

cellReselection Priorities SEQUENCE {

freqPriorityListEUTRA

Not present

Step1

freqPriorityListEUTRA SEQUENCE (SIZE (1..maxFreq)) OF FreqPriorityEUTRA {

1 entry

FreqPriorityListEUTRA[1] SEQUENCE {

entry 1

carrierFreq

Downlink ARFCN of E-UTRA Cell 1

cellReselectionPriority

5

Step5

3

Step10

3

Step14

}

}

freqPriorityListNR SEQUENCE (SIZE (1..maxFreq)) OF FreqPriorityNR {

1 entry

FreqPriorityNR[1] SEQUENCE {

entry 1

carrierFreq

Downlink SSB ARFCN of NR Cell 1

cellReselectionPriority

4

Step1

4

Step5

4

Step10

4

Step14

}

}

t320

Not present

Step1

Not present

Step5

Not present

Step10

min5

5 minutes

Step14

}

}

}

}

Table 6.2.3.5.3.3-6: REGISTRATION REQUEST (Step 8 and Step13, Table 6.2.3.5.3.2-3)

Derivation Path: TS 38.508-1 [4], Table 4.7.1-6.

Information Element

Value/remark

Comment

Condition

EPS NAS message container

TRACKING AREA UPDATE REQUEST message

See Table 6.2.3.5.3.3-7

Table 6.2.3.5.3.3-7: TRACKING AREA UPDATE REQUEST (Table 6.2.3.5.3.3-6)

Derivation Path: TS 38.508-1 [4], Table 4.9.9.2.3-2 with condition Mapped EPS security context

6.2.3.6 Inter-RAT cell reselection / From E-UTRA_IDLE to NR RRC_IDLE according to RAT priority provided by dedicated signalling (RRConnRelease)

6.2.3.6.1 Test Purpose (TP)

(1)

with { UE in E-UTRA RRC_Idle state having received RRCConnectionRelease including IdleModeMobilityControlInfo containing cellReselectionPriority for NR cell}

ensure that {

when { UE detects the cell re-selection criteria are met for the cell which belongs to the lower priority inter-RAT NR cell based on the configured RAT priority provided by dedicated signaling}

then { UE reselects the cell which belongs to the lower priority inter-RAT NR cell}

}

(2)

with { UE in NR RRC_IDLE state having inherit RAT priority provided by dedicated signaling with the remaining validity time}

ensure that {

when { UE discard the inherit RAT priority upon connection establishment}

then { UE reselects a cell by applying the cellReselectionPriority broadcast in the system information}

6.2.3.6.2 Conformance requirements

References: The conformance requirements covered in the present TC are specified in: 3GPP TS 36.304, clause 5.2.4.1, and 3GPP TS 38.304, clause 5.2.4.1. Unless otherwise stated these are Rel-15 requirements.

[TS 36.304, clause 5.2.4.1]

Absolute priorities of different E-UTRAN frequencies or inter-RAT frequencies may be provided to the UE in the system information, in the RRCConnectionRelease message, or by inheriting from another RAT at inter-RAT cell (re)selection. In the case of system information, an E-UTRAN frequency or inter-RAT frequency may be listed without providing a priority (i.e. the field cellReselectionPriority is absent for that frequency). If priorities are provided in dedicated signalling, the UE shall ignore all the priorities provided in system information. If UE is in camped on any cell state, UE shall only apply the priorities provided by system information from current cell, and the UE preserves priorities provided by dedicated signalling and deprioritisationReq received in RRCConnectionReject unless specified otherwise. When the UE in camped normally state, has only dedicated priorities other than for the current frequency, the UE shall consider the current frequency to be the lowest priority frequency (i.e. lower than any of the network configured values). While the UE is camped on a suitable CSG cell in normal coverage, the UE shall always consider the current frequency to be the highest priority frequency (i.e. higher than any of the network configured values), irrespective of any other priority value allocated to this frequency. When the HSDN capable UE is in High-mobility state, the UE shall always consider the HSDN cells to be the highest priority (i.e. higher than any other network configured priorities). When the HSDN capable UE is not in High-mobility state, the UE shall always consider HSDN cells to be the lowest priority (i.e. lower than network configured priorities). If the UE capable of sidelink communication is configured to perform sidelink communication and can only perform the sidelink communication while camping on a frequency, the UE may consider that frequency to be the highest priority. If the UE capable of V2X sidelink communication is configured to perform V2X sidelink communication and can only perform the V2X sidelink communication while camping on a frequency, the UE may consider that frequency to be the highest priority. If the UE capable of V2X sidelink communication is configured to perform V2X sidelink communication and can only use pre-configuration while not camping on a frequency, the UE may consider the frequency providing inter-carrier V2X sidelink configuration to be the highest priority. If the UE capable of sidelink discovery is configured to perform Public Safety related sidelink discovery and can only perform the Public Safety related sidelink discovery while camping on a frequency, the UE may consider that frequency to be the highest priority.

NOTE 1: The prioritization among the frequencies which UE considers to be the highest priority frequency is left to UE implementation.

If the UE is capable either of MBMS Service Continuity or of SC-PTM reception and is receiving or interested to receive an MBMS service and can only receive this MBMS service while camping on a frequency on which it is provided, the UE may consider that frequency to be the highest priority during the MBMS session TS 36.300 [2] as long as the two following conditions are fulfilled:

1) Either:

– the UE is capable of MBMS service continuity and the reselected cell is broadcasting SIB13; or

– the UE is capable of SC-PTM reception and the reselected cell is broadcasting SIB20;

2) Either:

– SIB15 of the serving cell indicates for that frequency one or more MBMS SAIs included and associated with that frequency in the MBMS User Service Description (USD) TS 26.346 [22] of this service; or

– SIB15 is not broadcast in the serving cell and that frequency is included in the USD of this service.

If the UE is capable either of MBMS Service Continuity or of SC-PTM reception and is receiving or interested to receive an MBMS service provided on a downlink only MBMS frequency, on a frequency used by dedicated MBMS cells, on a frequency used by FeMBMS/Unicast-mixed cells as defined in TS 36.300 [2], or on a frequency belonging to PLMN different from its registered PLMN, the UE may consider cell reselection candidate frequencies at which it can not receive the MBMS service to be of the lowest priority during the MBMS session TS 36.300 [2], as long as the above mentioned condition 1) is fulfilled for the cell on the MBMS frequency which the UE monitors or this cell broadcasts SIB1-MBMS and as long as the above mentioned condition 2) is fulfilled for the serving cell.

NOTE 2: Example scenarios in which the previous down-prioritisation may be needed concerns the cases where camping is not possible, while the UE can only receive this MBMS frequency when camping on a subset of cell reselection candidate frequencies, e.g. the MBMS frequency is a downlink only carrier, the MBMS frequency is used by dedicated MBMS cells, the MBMS frequency is used by FeMBMS/Unicast-mixed cells TS 36.300 [2], or the MBMS frequency belongs to a PLMN different from UE’s registered PLMN.

If the UE is not capable of MBMS Service Continuity but has knowledge on which frequency an MBMS service of interest is provided, it may consider that frequency to be the highest priority during the MBMS session TS 36.300 [2] as long as the reselected cell is broadcasting SIB13.

If the UE is not capable of MBMS Service Continuity but has knowledge on which downlink only frequency, on which frequency used by dedicated MBMS cells, on which frequency used by FeMBMS/Unicast-mixed cells as defined in TS 36.300 [2] or on which frequency belonging to PLMN different from its registered PLMN an MBMS service of interest is provided, it may consider cell reselection candidate frequencies at which it can not receive the MBMS service to be of the lowest priority during the MBMS session TS 36.300 [2] as long as the cell on the MBMS frequency which the UE monitors is broadcasting SIB13 or SIB1-MBMS.

NOTE 3: The UE considers that the MBMS session is ongoing using the session start and end times as provided by upper layers in the USD i.e. the UE does not verify if the session is indicated on MCCH.

In case UE receives RRCConnectionReject with deprioritisationReq, UE shall consider current carrier frequency and stored frequencies due to the previously received RRCConnectionReject with deprioritisationReq or all the frequencies of EUTRA to be the lowest priority frequency (i.e. lower than any of the network configured values) while T325 is running irrespective of camped RAT. The UE shall delete the stored deprioritisation request(s) when a PLMN selection is performed on request by NAS TS 23.122 [5].

NOTE 4: Connecting to CDMA2000 does not imply PLMN selection.

NOTE 5: UE should search for a higher priority layer for cell reselection as soon as possible after the change of priority. The minimum related performance requirements specified in TS 36.133 [10] are still applicable.

The UE shall delete priorities provided by dedicated signalling when:

– the UE enters a different RRC state; or

– the optional validity time of dedicated priorities (T320) expires; or

– a PLMN selection is performed on request by NAS TS 23.122 [5].

NOTE 6: Equal priorities between RATs are not supported.

The UE shall only perform cell reselection evaluation for E-UTRAN frequencies and inter-RAT frequencies that are given in system information and for which the UE has a priority provided.

The UE shall not consider any black listed cells as candidate for cell reselection.

The UE shall inherit the priorities provided by dedicated signalling and the remaining validity time (i.e., T320 in E-UTRA and NR, T322 in UTRA and T3230 in GERAN), if configured, at inter-RAT cell (re)selection.

NOTE 7: The network may assign dedicated cell reselection priorities for frequencies not configured by system information.

While T360 is running, redistribution target is considered to be the highest priority (i.e. higher than any of the network configured values). UE shall continue to consider the serving frequency as the highest priority until completion of E-UTRAN Inter-frequency Redistribution procedure specified in 5.2.4.10 if triggered on T360 expiry/ stop.

[TS 38.304, clause 5.2.4.1]

Absolute priorities of different NR frequencies or inter-RAT frequencies may be provided to the UE in the system information, in the RRCRelease message, or by inheriting from another RAT at inter-RAT cell (re)selection. In the case of system information, an NR frequency or inter-RAT frequency may be listed without providing a priority (i.e. the field cellReselectionPriority is absent for that frequency). If priorities are provided in dedicated signalling, the UE shall ignore all the priorities provided in system information. If UE is in camped on any cell state, UE shall only apply the priorities provided by system information from current cell, and the UE preserves priorities provided by dedicated signalling and deprioritisationReq received in RRCRelease unless specified otherwise. When the UE in camped normally state, has only dedicated priorities other than for the current frequency, the UE shall consider the current frequency to be the lowest priority frequency (i.e. lower than any of the network configured values).

The UE shall only perform cell reselection evaluation for NR frequencies and inter-RAT frequencies that are given in system information and for which the UE has a priority provided.

In case UE receives RRCRelease with deprioritisationReq, UE shall consider current frequency and stored frequencies due to the previously received RRCRelease with deprioritisationReq or all the frequencies of NR to be the lowest priority frequency (i.e. lower than any of the network configured values) while T325 is running irrespective of camped RAT. The UE shall delete the stored deprioritisation request(s) when a PLMN selection is performed on request by NAS (TS 23.122 [9]).

NOTE: UE should search for a higher priority layer for cell reselection as soon as possible after the change of priority. The minimum related performance requirements specified in TS 38.133 [8] are still applicable.

The UE shall delete priorities provided by dedicated signalling when:

– the UE enters a different RRC state; or

– the optional validity time of dedicated priorities (T320) expires; or

– a PLMN selection is performed on request by NAS (TS 23.122 [9]).

NOTE 2: Equal priorities between RATs are not supported.

The UE shall not consider any black listed cells as candidate for cell reselection.

The UE shall inherit the priorities provided by dedicated signalling and the remaining validity time (i.e. T320 in NR and E-UTRA), if configured, at inter-RAT cell (re)selection.

NOTE 3: The network may assign dedicated cell reselection priorities for frequencies not configured by system information.

6.2.3.6.3 Test description

6.2.3.6.3.1 Pre-test conditions

System Simulator:

– E-UTRA Cell 1, NR Cell 1 is different priority inter-RAT NR cell.

– System information combination 31 as defined in TS 36.508-1 [7] clause 4.4.3.1 is used in E-UTRA Cell.

– System information combination NR-6 as defined in TS 38.508-1 [4] clause 4.4.3.1.3 is used in NR Cell.

UE:

– None.

Preamble:

– With E-UTRA Cell 1 "Non-suitable "Off" cell" and NR Cell 1 "Serving cell" in accordance with TS 38.508-1 [4], Table 6.2.2.1-3, the UE is brought to state 1N-A, RRC_IDLE Connectivity (NR), in accordance with the procedure described in TS 38.508-1 [4], Table 4.5.2.2-2. 5G-GUTI and ngKSI are assigned and security context established.

– the UE is switched-off.

– With E-UTRA Cell 1 "Serving cell" and NR Cell 1 "Non-suitable "Off" cell" in accordance with TS 38.508-1 [4], Table 6.2.2.1-3, the UE is brought to state RRC_CONNECTED using generic procedure parameters Connectivity (E-UTRA/EPC) and Unrestricted nr PDN (On) in accordance with the procedure described in TS 38.508-1 [4], clause 4.5.4. 4G GUTI and eKSI are assigned and security context established.

6.2.3.6.3.2 Test procedure sequence

Table 6.2.3.6.3.2-1/2 illustrate the downlink power levels and other changing parameters to be applied for the cell at various time instants of the test execution. The exact instants on which these values shall be applied are described in the texts in this clause. Row marked "T0" denotes the conditions in the preamble. Configurations marked "T1", "T2" and "T3" are applied at the points indicated in the Main behaviour description in Table 6.2.3.6.3.2-3.

Table 6.2.3.6.3.2-1: Time instances of cell power level and parameter changes for E-UTRA Cell 1 and NR Cell 1 in FR1

Parameter

Unit

E-UTRA

Cell 1

NR

Cell 1

Remark

T0

Cell-specific RS EPRE

dBm/15kHz

-85

The power level values are assigned to ensure UE registered on E-UTRA cell 1

SS/PBCH

SSS EPRE

dBm/SCS

Off

T1

Cell-specific RS EPRE

dBm/15kHz

-95

The power level values are assigned to satisfy both SrxlevE-UTRA Cell 1 < Threshserving, low and SrxlevNR Cell 1 > Threshx, low.

SS/PBCH

SSS EPRE

dBm/SCS

-80

T2

Cell-specific RS EPRE

dBm/15kHz

-80

The power level values are assigned to satisfy both SrxlevNR Cell 1 < Threshserving, low and SrxlevE-UTRA Cell 1 > Threshx, low

SS/PBCH

SSS EPRE

dBm/SCS

-95

Table 6.2.3.6.3.2-2: Time instances of cell power level and parameter changes for E-UTRA Cell 1 and NR Cell 1 in FR2

Parameter

Unit

E-UTRA

Cell 1

NR

Cell 1

Remark

T0

Cell-specific RS EPRE

dBm/15kHz

FFS

The power level values are assigned to ensure UE registered on E-UTRA cell 1

SS/PBCH

SSS EPRE

dBm/SCS

Off

T1

Cell-specific RS EPRE

dBm/15kHz

FFS

The power level values are assigned to satisfy both SrxlevE-UTRA Cell 1 < Threshserving, low and SrxlevNR Cell 1 > Threshx, low.

SS/PBCH

SSS EPRE

dBm/SCS

FFS

T2

Cell-specific RS EPRE

dBm/15kHz

FFS

The power level values are assigned to satisfy both SrxlevNR Cell 1 < Threshserving, low and SrxlevE-UTRA Cell 1 > Threshx, low

SS/PBCH

SSS EPRE

dBm/SCS

FFS

Table 6.2.3.6.3.2-3: Main behaviour

St

Procedure

Message Sequence

TP

Verdict

U – S

Message

1

The SS transmmits RRCConnectionRelease message with dedicated priority information and validtity timer to the UE on E-UTRA cell 1.

<–

E-UTRA: RRCConnectionRelease

2

The SS adjusts the E-UTRAN and NR Cell power levels according to row "T1" in table 6.2.3.6.3.2-1/2.

3

Check: Does the test result of generic test procedure in TS 38.508-1 [4] Table 4.9.9.2.2-1 indicate that the UE is camped on NR Cell 1?

NOTE: This is the first time in this test case that the UE moves from S1 to N1.

1

4

Void.

5

The SS adjusts the E-UTRAN and NR Cell power levels according to row "T2" in table 6.2.3.6.3.2-1/2.

6

Check: Does the test result of generic test procedure in TS 38.508-1 [4] Table 4.9.7.2.2-1 is performed and the UE is camped on E-UTRAN Cell 1?

2

6.2.3.6.3.3 Specific message contents

Table 6.2.3.6.3.3-1: SystemInformationBlockType3 of EUTRA Cell 1 (preamble and all steps, Table 6.2.3.6.3.2-3)

Derivation Path: TS 36.508 [7], Table 4.4.3.3-2

Information Element

Value/remark

Comment

Condition

SystemInformationBlockType3 ::= SEQUENCE {

cellReselectionServingFreqInfo SEQUENCE {

threshServingLow

10

20 dB

}

}

Table 6.2.3.6.3.3-2: SystemInformationBlockType24 of EUTRA Cell 1 (preamble and all steps, Table 6.2.3.6.3.2-3)

Derivation path: TS 36.508 [7], Table 4.4.3.3-20

Information Element

Value/Remark

Comment

Condition

SystemInformationBlockType24-r15 ::= SEQUENCE {

carrierFreqListNR-r15 SEQUENCE (SIZE (1..maxFreq)) OF CarrierFreqNR-r15 {

1 entry

CarrierFreqNR-r15[1] SEQUENCE {

entry 1

carrierFreq-r15

Same downlink SSB ARFCN as used for NR Cell 1

cellReselectionPriority-r15

5

threshX-High-r15

20

40 dB

threshX-Low-r15

10

20 dB

}

}

t-ReselectionNR-r15

7

7 Seconds

}

Table 6.2.3.6.3.3-3: SIB2 of NR Cell 1(preamble and all steps, Table 6.2.3.6.3.2-3)

Derivation Path: TS 38.508-1 [4], Table 4.6.2-1

Information Element

Value/remark

Comment

Condition

SIB2 ::= SEQUENCE {

cellReselectionServingFreqInfo SEQUENCE {

threshServingLowP

10

20 dB

}

}

Table 6.2.3.6.3.3-4: SIB5 of NR Cell 1(preamble and all steps, Table 6.2.3.7.3.2-3)

Derivation Path: TS 38.508-1 [4], Table 4.6.2-4

Information Element

Value/remark

Comment

Condition

SIB5 ::= SEQUENCE {

carrierFreqListEUTRA SEQUENCE (SIZE (1..maxEUTRA-Carrier)) OF CarrierFreqEUTRA {

1 entry

CarrierFreqEUTRA[1] SEQUENCE {

entry 1

carrierFreq

Downlink EUTRA ARFCN as E-UTRA Cell 1 used

threshX-High

20

40 dB

threshX-Low

10

20 dB

}

}

t-ReselectionEUTRA

7

7 Seconds

}

Table 6.2.3.6.3.3-5: RRCConnectionRelease message for EUTRA Cell 1 (step 1 of Table 6.2.3.6.3.2-3)

Derivation path: TS 36.508 [7], Table 4.6.1-15

Information Element

Value/Remark

Comment

Condition

RRCConnectionRelease ::= SEQUENCE {

criticalExtensions CHOICE {

c1 CHOICE {

rrcConnectionRelease-r8 SEQUENCE {

IdleModeMobilityControlInfo SEQUENCE {

freqPriorityListEUTRA SEQUENCE (SIZE (1.. maxFreq)) OF FreqPriorityEUTRA {

1 entry

freqPriorityListEUTRA[1] SEQUENCE {

entry 1

carrierFreq

DownLink ARFCN-Value of E-UTRA cell 1

cellReselectionPriority

4

}

}

t320

Not present

freqPriorityListNR-r15 SEQUENCE (SIZE (1..maxFreq)) OF FreqPriorityNR-r15 {

1 entry

FreqPriorityNR-r15[1] SEQUENCE {

entry 1

carrierFreq-r15

Same Downlink SSB ARFCN as used for NR Cell 1

cellReselectionPriority-r15

3

}

}

}

}

}

}

}

6.2.3.7 Inter-RAT cell reselection / From NR RRC_IDLE to E-UTRA RRC_IDLE, Snonintrasearch

6.2.3.7.1 Test Purpose (TP)

(1)

with { UE in NR RRC_IDLE state, and the UE is not in high mobility state }

ensure that {

when { Snonintrasearch is non-zero in system information }

then { UE perform measurement and reselects to cell which belongs to the high priority E-UTRA cell even if Srxlev>Snonintrasearch }

}

6.2.3.7.2 Conformance requirements

References: The conformance requirements covered in the present TC are specified in: 3GPP TS 38.304, clause 5.2.4.1, 5.2.4.2 and 5.2.4.5. Unless otherwise stated these are Rel-15 requirements.

[TS 38.304, clause 5.2.4.1]

Absolute priorities of different NR frequencies or inter-RAT frequencies may be provided to the UE in the system information, in the RRCRelease message, or by inheriting from another RAT at inter-RAT cell (re)selection. In the case of system information, an NR frequency or inter-RAT frequency may be listed without providing a priority (i.e. the field cellReselectionPriority is absent for that frequency). If priorities are provided in dedicated signalling, the UE shall ignore all the priorities provided in system information. If UE is in camped on any cell state, UE shall only apply the priorities provided by system information from current cell, and the UE preserves priorities provided by dedicated signalling and deprioritisationReq received in RRCRelease unless specified otherwise. When the UE in camped normally state, has only dedicated priorities other than for the current frequency, the UE shall consider the current frequency to be the lowest priority frequency (i.e. lower than any of the network configured values).

The UE shall only perform cell reselection evaluation for NR frequencies and inter-RAT frequencies that are given in system information and for which the UE has a priority provided.

In case UE receives RRCRelease with deprioritisationReq, UE shall consider current frequency and stored frequencies due to the previously received RRCRelease with deprioritisationReq or all the frequencies of NR to be the lowest priority frequency (i.e. lower than any of the network configured values) while T325 is running irrespective of camped RAT. The UE shall delete the stored deprioritisation request(s) when a PLMN selection is performed on request by NAS (TS 23.122 [9]).

NOTE: UE should search for a higher priority layer for cell reselection as soon as possible after the change of priority. The minimum related performance requirements specified in TS 38.133 [8] are still applicable.

The UE shall delete priorities provided by dedicated signalling when:

– the UE enters a different RRC state; or

– the optional validity time of dedicated priorities (T320) expires; or

– a PLMN selection is performed on request by NAS (TS 23.122 [9]).

NOTE 2: Equal priorities between RATs are not supported.

The UE shall not consider any black listed cells as candidate for cell reselection.

The UE shall inherit the priorities provided by dedicated signalling and the remaining validity time (i.e. T320 in NR and E-UTRA), if configured, at inter-RAT cell (re)selection.

NOTE 3: The network may assign dedicated cell

[TS 38.304, clause 5.2.4.2]

Following rules are used by the UE to limit needed measurements:

– If the serving cell fulfils Srxlev > SIntraSearchP and Squal > SIntraSearchQ, the UE may choose not to perform intra-frequency measurements.

– Otherwise, the UE shall perform intra-frequency measurements.

– The UE shall apply the following rules for NR inter-frequencies and inter-RAT frequencies which are indicated in system information and for which the UE has priority provided as defined in 5.2.4.1:

– For a NR inter-frequency or inter-RAT frequency with a reselection priority higher than the reselection priority of the current NR frequency, the UE shall perform measurements of higher priority NR inter-frequency or inter-RAT frequencies according to TS 38.133 [8].

– For a NR inter-frequency with an equal or lower reselection priority than the reselection priority of the current NR frequency and for inter-RAT frequency with lower reselection priority than the reselection priority of the current NR frequency:

– If the serving cell fulfils Srxlev > SnonIntraSearchP and Squal > SnonIntraSearchQ, the UE may choose not to perform measurements of NR inter-frequencies or inter-RAT frequency cells of equal or lower priority;

– Otherwise, the UE shall perform measurements of NR inter-frequencies or inter-RAT frequency cells of equal or lower priority according to TS 38.133 [8].

[TS 38.304, clause 5.2.4.5]

If threshServingLowQ is broadcast in system information and more than 1 second has elapsed since the UE camped on the current serving cell, cell reselection to a cell on a higher priority NR frequency or inter-RAT frequency than the serving frequency shall be performed if:

– A cell of a higher priority NR or EUTRAN RAT/frequency fulfils Squal > ThreshX, HighQ during a time interval TreselectionRAT

Otherwise, cell reselection to a cell on a higher priority NR frequency or inter-RAT frequency than the serving frequency shall be performed if:

– A cell of a higher priority RAT/ frequency fulfils Srxlev > ThreshX, HighP during a time interval TreselectionRAT; and

– More than 1 second has elapsed since the UE camped on the current serving cell.

Cell reselection to a cell on an equal priority NR frequency shall be based on ranking for intra-frequency cell reselection as defined in sub-clause 5.2.4.6.

If threshServingLowQ is broadcast in system information and more than 1 second has elapsed since the UE camped on the current serving cell, cell reselection to a cell on a lower priority NR frequency or inter-RAT frequency than the serving frequency shall be performed if:

– The serving cell fulfils Squal < ThreshServing, LowQ and a cell of a lower priority NR or E-UTRAN RAT/ frequency fulfils Squal > ThreshX, LowQ during a time interval TreselectionRAT.

Otherwise, cell reselection to a cell on a lower priority NR frequency or inter-RAT frequency than the serving frequency shall be performed if:

– The serving cell fulfils Srxlev < ThreshServing, LowP and a cell of a lower priority RAT/ frequency fulfils Srxlev > ThreshX, LowP during a time interval TreselectionRAT; and

– More than 1 second has elapsed since the UE camped on the current serving cell.

Cell reselection to a higher priority RAT/frequency shall take precedence over a lower priority RAT/frequency if multiple cells of different priorities fulfil the cell reselection criteria.

If more than one cell meets the above criteria, the UE shall reselect a cell as follows:

– If the highest-priority frequency is an NR frequency, the highest ranked cell among the cells on the highest priority frequency(ies) meeting the criteria according to clause 5.2.4.6;

– If the highest-priority frequency is from another RAT, the highest ranked cell among the cells on the highest priority frequency(ies) meeting the criteria of that RAT.

6.2.3.7.3 Test description

6.2.3.7.3.1 Pre-test conditions

System Simulator:

– NR Cell 1, E-UTRA Cell 1 is higher priority inter-RAT cell.

– System information combination NR-6 as defined in TS 38.508-1 [4] clause 4.4.3.1.3 is used in NR Cell.

– System information combination 31 as defined in TS 36.508-1 [7] clause 4.4.3.1 is used in E-UTRA Cell.

UE:

None.

Preamble:

– With E-UTRA Cell 1 "Serving cell" and NR Cell 1 "Non-suitable "Off" cell" in accordance with TS 38.508-1 [4], Table 6.2.2.1-3, the UE is brought to state RRC_IDLE using generic procedure parameters Connectivity (E-UTRA/EPC) and Unrestricted nr PDN (On) in accordance with the procedure described in TS 38.508-1 [4], clause 4.5.2. 4G GUTI and eKSI are assigned and security context established.

– the UE is switched-off.

– With E-UTRA Cell 1 "Non-suitable "Off" cell" and NR Cell 1 "Serving cell" in accordance with TS 38.508-1 [4], Table 6.2.2.1-3, the UE is brought to state 1N-A, RRC_IDLE Connectivity (NR), in accordance with the procedure described in TS 38.508-1 [4], Table 4.5.2.2-2. 5G-GUTI and ngKSI are assigned and security context established.

6.2.3.7.3.2 Test procedure sequence

Table 6.2.3.7.3.2-1/2 illustrate the downlink power levels and other changing parameters to be applied for the cell at various time instants of the test execution. The exact instants on which these values shall be applied are described in the texts in this clause. Row marked "T0" denotes the conditions in the preamble. Configurations marked "T1"is applied at the points indicated in the Main behaviour description in Table 6.2.3.7.3.2-3.

Table 6.2.3.7.3.2-1: Time instances of cell power level and parameter changes for E-UTRA Cell 1 and NR Cell 1 in FR1

Parameter

Unit

NR

Cell 1

E-UTRA

Cell 1

Remark

T0

Cell-specific RS EPRE

dBm/15kHz

Off

The power level values are assigned to ensure UE registered on NR Cell 1

SS/PBCH

SSS EPRE

dBm/SCS

-88

T1

Cell-specific RS EPRE

dBm/15kHz

-75

The power level values are assigned to satisfy Srxlev NR Cell 1 >Snonintrasearch and SrxlevE-UTRA Cell 1> Threshx, high.

SS/PBCH

SSS EPRE

dBm/SCS

-90

Table 6.2.3.7.3.2-2: Time instances of cell power level and parameter changes for E-UTRA Cell 1 and NR Cell 1 in FR2

Parameter

Unit

NR

Cell 1

E-UTRA

Cell 1

Remark

T0

Cell-specific RS EPRE

dBm/15kHz

Off

The power level values are assigned to ensure UE registered on NR Cell 1

SS/PBCH

SSS EPRE

dBm/SCS

FFS

T1

Cell-specific RS EPRE

dBm/15kHz

-75

The power level values are assigned to satisfy Srxlev NR Cell 1 >Snonintrasearch and SrxlevE-UTRA Cell 1> Threshx, high.

SS/PBCH

SSS EPRE

dBm/SCS

FFS

Table 6.2.3.7.3.2-3: Main behaviour

St

Procedure

Message Sequence

TP

Verdict

U – S

Message

1

The SS adjusts the NR and E-UTRAN Cell power levels according to row "T1" in table 6.2.3.7.3.2-1/2.

2

Check: Does the test result of generic test procedure in TS 38.508-1 [4] Table 4.9.7.2.2-1 is performed and the UE is camped on E-UTRAN Cell 1?

1

6.2.3.7.3.3 Specific message contents

Table 6.2.3.7.3.3-1: SIB2 of NR Cell 1 (preabmle and all steps, Table 6.2.3.7.3.2-3)

Derivation Path: TS 38.508-1 [4], Table 4.6.2-1

Information Element

Value/remark

Comment

Condition

SIB2 ::= SEQUENCE {

cellReselectionServingFreqInfo SEQUENCE {

s-NonIntraSearchP

3

6 dB

threshServingLowP

3

6 dB

}

}

Table 6.2.3.7.3.3-2: SIB5 of NR Cell 1(preamble and all steps, Table 6.2.3.7.3.2-3)

Derivation Path: TS 38.508-1 [4], Table 4.6.2-4

Information Element

Value/remark

Comment

Condition

SIB5 ::= SEQUENCE {

carrierFreqListEUTRA SEQUENCE (SIZE (1..maxEUTRA-Carrier)) OF CarrierFreqEUTRA {

1 entry

CarrierFreqEUTRA[1] SEQUENCE {

entry 1

carrierFreq

Downlink EUTRA ARFCN as E-UTRA Cell 1 used

cellReselectionPriority

5

threshX-High

10

20 dB

threshX-Low

20

40 dB

}

}

t-ReselectionEUTRA

7

7 Seconds

}

Table 6.2.3.7.3.3-3: SystemInformationBlockType3 of EUTRA Cell 1 (preamble and all steps, Table 6.2.3.7.3.2-3)

Derivation Path: TS 36.508 [7], Table 4.4.3.3-2

Information Element

Value/remark

Comment

Condition

SystemInformationBlockType3 ::= SEQUENCE {

cellReselectionServingFreqInfo SEQUENCE {

threshServingLow

3

6 dB

}

}

Table 6.2.3.7.3.3-4: SystemInformationBlockType24 for EUTRA Cell 1 (preamble and all steps, Table 6.2.3.7.3.2-3)

Derivation path: TS 36.508 [7], Table 4.4.3.3-20

Information Element

Value/Remark

Comment

Condition

SystemInformationBlockType24-r15 ::= SEQUENCE {

carrierFreqListNR-r15 SEQUENCE (SIZE (1..maxFreq)) OF CarrierFreqNR-r15 {

1 entry

CarrierFreqNR-r15[1] SEQUENCE {

entry 1

carrierFreq-r15

Same downlink SSB ARFCN as used for NR Cell 1

cellReselectionPriority-r15

3

threshX-High-r15

15

30 dB

threshX-Low-r15

15

30 dB

}

t-ReselectionNR-r15

7

7 Seconds

}

6.2.3.8 Inter-RAT cell reselection / From E-UTRA RRC_IDLE to NR RRC_IDLE, Snonintrasearch

6.2.3.8.1 Test Purpose (TP)

(1)

with { UE in E-UTRA RRC_Idle state, and the UE is not in high mobility state }

ensure that {

when { Snonintrasearch is non-zero in system information }

then { UE perform measurement and reselects to cell which belongs to the high priority NR cell even if Srxlev>Snonintrasearch }

}

6.2.3.8.2 Conformance requirements

References: The conformance requirements covered in the present TC are specified in: 3GPP TS 36.304, clause 5.2.4.1, 5.2.4.2 and 5.2.4.5. Unless otherwise stated these are Rel-15 requirements.

[TS 36.304, clause 5.2.4.1]

Absolute priorities of different E-UTRAN frequencies or inter-RAT frequencies may be provided to the UE in the system information, in the RRCConnectionRelease message, or by inheriting from another RAT at inter-RAT cell (re)selection. In the case of system information, an E-UTRAN frequency or inter-RAT frequency may be listed without providing a priority (i.e. the field cellReselectionPriority is absent for that frequency). If priorities are provided in dedicated signalling, the UE shall ignore all the priorities provided in system information. If UE is in camped on any cell state, UE shall only apply the priorities provided by system information from current cell, and the UE preserves priorities provided by dedicated signalling and deprioritisationReq received in RRCConnectionReject unless specified otherwise. When the UE in camped normally state, has only dedicated priorities other than for the current frequency, the UE shall consider the current frequency to be the lowest priority frequency (i.e. lower than any of the network configured values). While the UE is camped on a suitable CSG cell in normal coverage, the UE shall always consider the current frequency to be the highest priority frequency (i.e. higher than any of the network configured values), irrespective of any other priority value allocated to this frequency. When the HSDN capable UE is in High-mobility state, the UE shall always consider the HSDN cells to be the highest priority (i.e. higher than any other network configured priorities). When the HSDN capable UE is not in High-mobility state, the UE shall always consider HSDN cells to be the lowest priority (i.e. lower than network configured priorities). If the UE capable of sidelink communication is configured to perform sidelink communication and can only perform the sidelink communication while camping on a frequency, the UE may consider that frequency to be the highest priority. If the UE capable of V2X sidelink communication is configured to perform V2X sidelink communication and can only perform the V2X sidelink communication while camping on a frequency, the UE may consider that frequency to be the highest priority. If the UE capable of V2X sidelink communication is configured to perform V2X sidelink communication and can only use pre-configuration while not camping on a frequency, the UE may consider the frequency providing inter-carrier V2X sidelink configuration to be the highest priority. If the UE capable of sidelink discovery is configured to perform Public Safety related sidelink discovery and can only perform the Public Safety related sidelink discovery while camping on a frequency, the UE may consider that frequency to be the highest priority.

NOTE 1: The prioritization among the frequencies which UE considers to be the highest priority frequency is left to UE implementation.

If the UE is capable either of MBMS Service Continuity or of SC-PTM reception and is receiving or interested to receive an MBMS service and can only receive this MBMS service while camping on a frequency on which it is provided, the UE may consider that frequency to be the highest priority during the MBMS session TS 36.300 [2] as long as the two following conditions are fulfilled:

1) Either:

– the UE is capable of MBMS service continuity and the reselected cell is broadcasting SIB13; or

– the UE is capable of SC-PTM reception and the reselected cell is broadcasting SIB20;

2) Either:

– SIB15 of the serving cell indicates for that frequency one or more MBMS SAIs included and associated with that frequency in the MBMS User Service Description (USD) TS 26.346 [22] of this service; or

– SIB15 is not broadcast in the serving cell and that frequency is included in the USD of this service.

If the UE is capable either of MBMS Service Continuity or of SC-PTM reception and is receiving or interested to receive an MBMS service provided on a downlink only MBMS frequency, on a frequency used by dedicated MBMS cells, on a frequency used by FeMBMS/Unicast-mixed cells as defined in TS 36.300 [2], or on a frequency belonging to PLMN different from its registered PLMN, the UE may consider cell reselection candidate frequencies at which it can not receive the MBMS service to be of the lowest priority during the MBMS session TS 36.300 [2], as long as the above mentioned condition 1) is fulfilled for the cell on the MBMS frequency which the UE monitors or this cell broadcasts SIB1-MBMS and as long as the above mentioned condition 2) is fulfilled for the serving cell.

NOTE 2: Example scenarios in which the previous down-prioritisation may be needed concerns the cases where camping is not possible, while the UE can only receive this MBMS frequency when camping on a subset of cell reselection candidate frequencies, e.g. the MBMS frequency is a downlink only carrier, the MBMS frequency is used by dedicated MBMS cells, the MBMS frequency is used by FeMBMS/Unicast-mixed cells TS 36.300 [2], or the MBMS frequency belongs to a PLMN different from UE’s registered PLMN.

If the UE is not capable of MBMS Service Continuity but has knowledge on which frequency an MBMS service of interest is provided, it may consider that frequency to be the highest priority during the MBMS session TS 36.300 [2] as long as the reselected cell is broadcasting SIB13.

If the UE is not capable of MBMS Service Continuity but has knowledge on which downlink only frequency, on which frequency used by dedicated MBMS cells, on which frequency used by FeMBMS/Unicast-mixed cells as defined in TS 36.300 [2] or on which frequency belonging to PLMN different from its registered PLMN an MBMS service of interest is provided, it may consider cell reselection candidate frequencies at which it can not receive the MBMS service to be of the lowest priority during the MBMS session TS 36.300 [2] as long as the cell on the MBMS frequency which the UE monitors is broadcasting SIB13 or SIB1-MBMS.

NOTE 3: The UE considers that the MBMS session is ongoing using the session start and end times as provided by upper layers in the USD i.e. the UE does not verify if the session is indicated on MCCH.

In case UE receives RRCConnectionReject with deprioritisationReq, UE shall consider current carrier frequency and stored frequencies due to the previously received RRCConnectionReject with deprioritisationReq or all the frequencies of EUTRA to be the lowest priority frequency (i.e. lower than any of the network configured values) while T325 is running irrespective of camped RAT. The UE shall delete the stored deprioritisation request(s) when a PLMN selection is performed on request by NAS TS 23.122 [5].

NOTE 4: Connecting to CDMA2000 does not imply PLMN selection.

NOTE 5: UE should search for a higher priority layer for cell reselection as soon as possible after the change of priority. The minimum related performance requirements specified in TS 36.133 [10] are still applicable.

The UE shall delete priorities provided by dedicated signalling when:

– the UE enters a different RRC state; or

– the optional validity time of dedicated priorities (T320) expires; or

– a PLMN selection is performed on request by NAS TS 23.122 [5].

NOTE 6: Equal priorities between RATs are not supported.

The UE shall only perform cell reselection evaluation for E-UTRAN frequencies and inter-RAT frequencies that are given in system information and for which the UE has a priority provided.

The UE shall not consider any black listed cells as candidate for cell reselection.

The UE shall inherit the priorities provided by dedicated signalling and the remaining validity time (i.e., T320 in E-UTRA and NR, T322 in UTRA and T3230 in GERAN), if configured, at inter-RAT cell (re)selection.

NOTE 7: The network may assign dedicated cell reselection priorities for frequencies not configured by system information.

While T360 is running, redistribution target is considered to be the highest priority (i.e. higher than any of the network configured values). UE shall continue to consider the serving frequency as the highest priority until completion of E-UTRAN Inter-frequency Redistribution procedure specified in 5.2.4.10 if triggered on T360 expiry/ stop.

[TS 36.304, clause 5.2.4.2]

For NB-IoT measurement rules for cell re-selection is defined in sub-clause 5.2.4.2.a.

When evaluating Srxlev and Squal of non-serving cells for reselection purposes, the UE shall use parameters provided by the serving cell.

Following rules are used by the UE to limit needed measurements:

– If the serving cell fulfils Srxlev > SIntraSearchP and Squal > SIntraSearchQ, the UE may choose not to perform intra-frequency measurements.

– Otherwise, the UE shall perform intra-frequency measurements.

– The UE shall apply the following rules for E-UTRAN inter-frequencies and inter-RAT frequencies which are indicated in system information and for which the UE has priority provided as defined in 5.2.4.1:

– For an E-UTRAN inter-frequency or inter-RAT frequency with a reselection priority higher than the reselection priority of the current E-UTRA frequency the UE shall perform measurements of higher priority E-UTRAN inter-frequency or inter-RAT frequencies according to TS 36.133 [10].

– For an E-UTRAN inter-frequency with an equal or lower reselection priority than the reselection priority of the current E-UTRA frequency and for inter-RAT frequency with lower reselection priority than the reselection priority of the current E-UTRAN frequency:

– If the serving cell fulfils Srxlev > SnonIntraSearchP and Squal > SnonIntraSearchQ, the UE may choose not to perform measurements of E-UTRAN inter-frequencies or inter-RAT frequency cells of equal or lower priority unless the UE is triggered to measure an E-UTRAN inter-frequency which is configured with redistributionInterFreqInfo.

– Otherwise, the UE shall perform measurements of E-UTRAN inter-frequencies or inter-RAT frequency cells of equal or lower priority according to TS 36.133 [10].

– If the UE supports relaxed monitoring and s-SearchDeltaP is present in SystemInformationBlockType3, the UE may further limit the needed measurements, as specified in sub-clause 5.2.4.12.

[TS 36.304, clause 5.2.4.5]

For NB-IoT inter-frequency cell reselection shall be based on ranking as defined in sub-clause 5.2.4.6.

If threshServingLowQ is provided in SystemInformationBlockType3 and more than 1 second has elapsed since the UE camped on the current serving cell, cell reselection to a cell on a higher priority E-UTRAN frequency or inter-RAT frequency than the serving frequency shall be performed if:

– A cell of a higher priority EUTRAN, NR or UTRAN FDD RAT/ frequency fulfils Squal > ThreshX, HighQ during a time interval TreselectionRAT; or

– A cell of a higher priority UTRAN TDD, GERAN or CDMA2000 RAT/ frequency fulfils Srxlev > ThreshX, HighP during a time interval TreselectionRAT.

Otherwise, cell reselection to a cell on a higher priority E-UTRAN frequency or inter-RAT frequency than the serving frequency shall be performed if:

– A cell of a higher priority RAT/ frequency fulfils Srxlev > ThreshX, HighP during a time interval TreselectionRAT; and

– More than 1 second has elapsed since the UE camped on the current serving cell.

Cell reselection to a cell on an equal priority E-UTRAN frequency shall be based on ranking for Intra-frequency cell reselection as defined in sub-clause 5.2.4.6.

If threshServingLowQ is provided in SystemInformationBlockType3 and more than 1 second has elapsed since the UE camped on the current serving cell, cell reselection to a cell on a lower priority E-UTRAN frequency or inter-RAT frequency than the serving frequency shall be performed if:

– The serving cell fulfils Squal < ThreshServing, LowQ and a cell of a lower priority EUTRAN, NR or UTRAN FDD RAT/ frequency fulfils Squal > ThreshX, LowQ during a time interval TreselectionRAT; or

– The serving cell fulfils Squal < ThreshServing, LowQ and a cell of a lower priority UTRAN TDD, GERAN or CDMA2000 RAT/ frequency fulfils Srxlev > ThreshX, LowP during a time interval TreselectionRAT.

Otherwise, cell reselection to a cell on a lower priority E-UTRAN frequency or inter-RAT frequency than the serving frequency shall be performed if:

– The serving cell fulfils Srxlev < ThreshServing, LowP and a cell of a lower priority RAT/ frequency fulfils Srxlev > ThreshX, LowP during a time interval TreselectionRAT; and

– More than 1 second has elapsed since the UE camped on the current serving cell.

Cell reselection to a higher priority RAT/ frequency shall take precedence over a lower priority RAT/ frequency, if multiple cells of different priorities fulfil the cell reselection criteria.

The UE shall not perform cell reselection to NR or UTRAN FDD cells for which the cell selection criterion S is not fulfilled.

For cdma2000 RATs, Srxlev is equal to -FLOOR(-2 x 10 x log10 Ec/Io) in units of 0.5 dB, as defined in [18], with Ec/Io referring to the value measured from the evaluated cell.

For cdma2000 RATs, ThreshX, HighP and ThreshX, LowP are equal to -1 times the values signalled for the corresponding parameters in the system information.

In all the above criteria the value of TreselectionRAT is scaled when the UE is in the medium or high mobility state as defined in subclause 5.2.4.3.1. If more than one cell meets the above criteria, the UE shall reselect a cell as follows:

– If the highest-priority frequency is an E-UTRAN frequency, a cell ranked as the best cell among the cells on the highest priority frequency(ies) meeting the criteria according to clause 5.2.4.6;

– If the highest-priority frequency is from another RAT, a cell ranked as the best cell among the cells on the highest priority frequency(ies) meeting the criteria of that RAT.

Cell reselection to another RAT, for which Squal based cell reselection parameters are broadcast in system information, shall be performed based on the Squal criteria if the UE supports Squal (RSRQ) based cell reselection to E-UTRAN from all the other RATs provided by system information which UE supports. Otherwise, cell reselection to another RAT shall be performed based on Srxlev criteria.

Cell reselection to NR, for which a cell reselection parameter, q-RxLevMinSUL is broadcast in system information and the UE supports SUL, shall be performed based on Srxlev criteria taking the parameter into account.

6.2.3.8.3 Test description

6.2.3.8.3.1 Pre-test conditions

System Simulator:

– E-UTRA Cell 1, NR Cell 1 is higher priority inter-RAT NR cell.

– System information combination 31 as defined in TS 36.508-1 [7] clause 4.4.3.1 is used in E-UTRA Cell.

– System information combination NR-6 as defined in TS 38.508-1 [4] clause 4.4.3.1.3 is used in NR Cell.

UE:

– None.

Preamble:

– With E-UTRA Cell 1 "Non-suitable "Off" cell" and NR Cell 1 "Serving cell" in accordance with TS 38.508-1 [4], Table 6.2.2.1-3, the UE is brought to state 1N-A, RRC_IDLE Connectivity (NR), in accordance with the procedure described in TS 38.508-1 [4], Table 4.5.2.2-2. 5G-GUTI and ngKSI are assigned and security context established.

– the UE is switched-off.

– With E-UTRA Cell 1 "Serving cell" and NR Cell 1 "Non-suitable "Off" cell" in accordance with TS 38.508-1 [4], Table 6.2.2.1-3, the UE is brought to state RRC_IDLE using generic procedure parameters Connectivity (E-UTRA/EPC) and Unrestricted nr PDN (On) in accordance with the procedure described in TS 38.508-1 [4], clause 4.5.2. 4G GUTI and eKSI are assigned and security context established.

6.2.3.8.3.2 Test procedure sequence

Table 6.2.3.8.3.2-1/2 illustrate the downlink power levels and other changing parameters to be applied for the cell at various time instants of the test execution. The exact instants on which these values shall be applied are described in the texts in this clause. Row marked "T0" denotes the conditions in the preamble. Configurations marked "T1"is applied at the points indicated in the Main behaviour description in Table 6.2.3.8.3.2-3.

Table 6.2.3.8.3.2-1: Time instances of cell power level and parameter changes for E-UTRA Cell and NR Cell in FR1

Parameter

Unit

E-UTRA

Cell 1

NR

Cell 1

Remark

T0

Cell-specific RS EPRE

dBm/15kHz

-85

The power level values are assigned to ensure UE registered on E-UTRA Cell 1

SS/PBCH

SSS EPRE

dBm/SCS

Off

T1

Cell-specific RS EPRE

dBm/15kHz

-90

The power level values are assigned to satisfy Srxlev E-UTRA Cell 1 >Snonintrasearch and and SrxlevNR Cell 1> Threshx, high.

SS/PBCH

SSS EPRE

dBm/SCS

-80

Table 6.2.3.8.3.2-2: Time instances of cell power level and parameter changes for E-UTRA Cell and NR Cell in FR2

Parameter

Unit

E-UTRA

Cell 1

NR

Cell 1

Remark

T0

Cell-specific RS EPRE

dBm/15kHz

FFS

The power level values are assigned to ensure UE registered on E-UTRA Cell 1

SS/PBCH

SSS EPRE

dBm/SCS

Off

T1

Cell-specific RS EPRE

dBm/15kHz

FFS

The power level values are assigned to satisfy Srxlev E-UTRA Cell 1 >Snonintrasearch and and SrxlevNR Cell 1> Threshx, high.

SS/PBCH

SSS EPRE

dBm/SCS

FFS

Table 6.2.3.8.3.2-3: Main behaviour

St

Procedure

Message Sequence

TP

Verdict

U – S

Message

1

The SS adjusts the E-UTRAN and NR Cell power levels according to row "T1" in table 6.2.3.8.3.2-1/2.

2

Check: Does the test result of generic test procedure in TS 38.508-1 [4] Table 4.9.9.2.2-1 indicate that the UE is camped on NR Cell 1?

NOTE: This is the first time in this test case that the UE moves from S1 to N1.

1

3

Void.

6.2.3.8.3.3 Specific message contents

Table 6.2.3.8.3.3-1: SystemInformationBlockType3 of EUTRA Cell 1 (preamble and all steps, Table 6.2.3.8.3.2-3)

Derivation Path: TS 36.508 [7], Table 4.4.3.3-2

Information Element

Value/remark

Comment

Condition

SystemInformationBlockType3 ::= SEQUENCE {

cellReselectionServingFreqInfo SEQUENCE {

s-NonIntraSearch

3

6 dB

threshServingLow

3

6 dB

}

Table 6.2.3.8.3.3-2: SystemInformationBlockType24 of EUTRA Cell 1 (preamble and all steps, Table 6.2.3.8.3.2-3)

Derivation path: TS 36.508 [7], Table 4.4.3.3-20

Information Element

Value/Remark

Comment

Condition

SystemInformationBlockType24-r15 ::= SEQUENCE {

carrierFreqListNR-r15 SEQUENCE (SIZE (1..maxFreq)) OF CarrierFreqNR-r15 {

1 entry

CarrierFreqNR-r15[1] SEQUENCE {

entry 1

carrierFreq-r15

Same downlink SSB ARFCN as used for NR Cell 1

cellReselectionPriority-r15

5

threshX-High-r15

10

20 dB

threshX-Low-r15

20

40 dB

}

}

t-ReselectionNR-r15

7

7 Seconds

}

Table 6.2.3.8.3.3-3: SIB2 of NR Cell 1 (preabmle and all steps, Table 6.2.3.8.3.2-3)

Derivation Path: TS 38.508-1 [4], Table 4.6.2-1

Information Element

Value/remark

Comment

Condition

SIB2 ::= SEQUENCE {

cellReselectionServingFreqInfo SEQUENCE {

threshServingLowP

3

6 dB

}

}

Table 6.2.3.8.3.3-4: SIB5 of NR Cell 1(preamble and all steps, Table 6.2.3.8.3.2-3)

Derivation Path: TS 38.508 [6], Table 4.6.2-4

Information Element

Value/remark

Comment

Condition

SIB5 ::= SEQUENCE {

carrierFreqListEUTRA SEQUENCE (SIZE (1..maxEUTRA-Carrier)) OF CarrierFreqEUTRA {

1 entry

CarrierFreqEUTRA[1] SEQUENCE {

entry 1

carrierFreq

Downlink EUTRA ARFCN as E-UTRA Cell 1 used

cellReselectionPriority

3

threshX-High

15

30 dB

threshX-Low

15

30 dB

}

}

t-ReselectionEUTRA

7

7 Seconds

}

6.2.3.9 Void

6.2.3.10 Inter-RAT cell reselection / From E-UTRA_IDLE to NR RRC_IDLE / schedulingInfoList-v12j0

6.2.3.10.1 Test Purpose (TP)

(1)

with { the UE is in E-UTRA IDLE state and SystemInformationBlockType24 scheduled by optional extended field schedulingInfoList-v12j0 in SystemInformationBlockType1 is broadcasted }

ensure that {

when { UE detects the cell re-selection criteria is met for a lower priority NR cell }

then { UE reselects to the NR cell }

}

6.2.3.10.2 Conformance requirements

References: The conformance requirements covered in the current TC are specified in: TS 36.331, clause 5.2.3 and 5.2.3a and TS 36.304, clause 5.2.4.1, 5.2.4.2 and 5.2.4.5. Unless otherwise stated these are Rel-15 requirements.

[TS 36.331, clause 5.2.3]

When acquiring an SI message, the UE shall:

1> determine the start of the SI-window for the concerned SI message as follows:

2> if the concerned SI message is configured in the schedulingInfoList, schedulingInfoListExt (if present) or if the concerned SI message is configured in the pos-schedulingInfoList and si-posOffset is not configured;

3> for the concerned SI message, determine the number n which corresponds to the order of entry in the concatenated list of SI messages configured by schedulingInfoList, schedulingInfoListExt (if present) and posSchedulingInfoList in SystemInformationBlockType1;

3> determine the integer value x = (n – 1)*w, where w is the si-WindowLength;

3> the SI-window starts at the subframe #a, where a = x mod 10, in the radio frame for which SFN mod T = FLOOR(x/10), where T is the si-Periodicity of the concerned SI message;

2> else if the concerned SI message is configured by the posSchedulingInfoList and si-posOffset is configured determine the start of the SI-window for the concerned SI message as follows:

3> determine the number m which corresponds to the number of SI messages with an associated si-Periodicity of 8 radio frames (80 ms), configured by schedulingInfoList and schedulingInfoListExt (if present) in SystemInformationBlockType1;

3> for the concerned SI message, determine the number n which corresponds to the order of entry in the list of SI messages configured by posSchedulingInfoList in SystemInformationBlockType1;

3> determine the integer value x = m*w + (n – 1)*w, where w is the si-WindowLength

3> the SI-window starts at the subframe #a, where a = x mod 10, in the radio frame for which SFN mod T = FLOOR(x/10) + 8, where T is the si-posPeriodicity of the concerned SI message;

NOTE: E-UTRAN should configure an SI-window of 1 ms only if all SIs are scheduled before subframe #5 in radio frames for which SFN mod 2 = 0.

1> receive DL-SCH using the SI-RNTI from the start of the SI-window and continue until the end of the SI-window whose absolute length in time is given by si-WindowLength, or until the SI message was received, excluding the following subframes:

2> subframe #5 in radio frames for which SFN mod 2 = 0;

2> any MBSFN subframes;

2> any uplink subframes in TDD;

1> if the SI message was not received by the end of the SI-window, repeat reception at the next SI-window occasion for the concerned SI message;

[TS 36.331, clause 5.2.3a]

When acquiring an SI message, the BL UE or UE in CE or NB-IoT UE shall:

1> determine the start of the SI-window for the concerned SI message as follows:

2> if the concerned SI message is configured in the schedulingInfoList, schedulingInfoListExt (if present) or if the concerned SI message is configured in the pos-schedulingInfoList and si-posOffset is not configured;

3> for the concerned SI message, determine the number n which corresponds to the order of entry in the concatenated list of SI messages configured by schedulingInfoList, schedulingInfoListExt (if present) in SystemInformationBlockType1-BR (or SystemInformationBlockType1-NB in NB-IoT) and posSchedulingInfoList in SystemInformationBlockType1-BR;

3> determine the integer value x = (n – 1)*w, where w is the si-WindowLength-BR (or si-WindowLength in NB-IoT);

2> else if the concerned SI message is configured by the posSchedulingInfoList and si-posOffset is configured determine the start of the SI-window for the concerned SI message as follows:

3> determine the number m which corresponds to the number of SI messages with an associated si-Periodicity of 8 radio frames (80 ms), configured by schedulingInfoList and schedulingInfoListExt (if present) in SystemInformationBlockType1-BR;

3> for the concerned SI message, determine the number n which corresponds to the order of entry in the list of SI messages configured by posSchedulingInfoList in SystemInformationBlockType1-BR;

3> determine the integer value x = m*w + (n – 1)*w, where w is the si-WindowLength-BR;

3> the SI-window starts at the subframe #a, where a = x mod 10, in the radio frame for which SFN mod T = FLOOR(x/10) + 8, where T is the si-posPeriodicity of the concerned SI message;

2> if the UE is a NB-IoT UE:

3> the SI-window starts at the subframe #0 in the radio frame for which (H-SFN * 1024 + SFN) mod T = FLOOR(x/10) + Offset, where T is the si-Periodicity of the concerned SI message and, Offset is the offset of the start of the SI-Window (si-RadioFrameOffset);

2> else:

3> the SI-window starts at the subframe #0 in the radio frame for which SFN mod T = FLOOR(x/10), where T is the si-Periodicity of the concerned SI message;

1> if the UE is a NB-IoT UE:

2> receive and accumulate SI message transmissions on DL-SCH from the start of the SI-window and continue until the end of the SI-window whose absolute length in time is given by si-WindowLength, starting from the radio frames as provided in si-RepetitionPattern and in subframes as provided in downlinkBitmap, or until successful decoding of the accumulated SI message transmissions excluding the subframes used for transmission of NPSS, NSSS, MasterInformationBlock-NB/ MasterInformationBlock-TDD-NB and SystemInformationBlockType1-NB. If there are not enough subframes for one SI message transmission in the radio frames as provided in si-RepetitionPattern, the UE shall continue to receive the SI message transmission in the radio frames following the radio frame indicated in si-RepetitionPattern;

1> else:

2> receive and accumulate SI message transmissions on DL-SCH on narrowband provided by si-Narrowband, from the start of the SI-window and continue until the end of the SI-window whose absolute length in time is given by si-WindowLength-BR, only in radio frames as provided in si-RepetitionPattern and subframes as provided in fdd-DownlinkOrTddSubframeBitmapBR in bandwidthReducedAccessRelatedInfo, or until successful decoding of the accumulated SI message transmissions;

1> if the SI message was not possible to decode from the accumulated SI message transmissions by the end of the SI-window, continue reception and accumulation of SI message transmissions on DL-SCH in the next SI-window occasion for the concerned SI message;

[TS 36.304, clause 5.2.4.1]

Absolute priorities of different E-UTRAN frequencies or inter-RAT frequencies may be provided to the UE in the system information, in the RRCConnectionRelease message, or by inheriting from another RAT at inter-RAT cell (re)selection. In the case of system information, an E-UTRAN frequency or inter-RAT frequency may be listed without providing a priority (i.e. the field cellReselectionPriority is absent for that frequency). If priorities are provided in dedicated signalling, the UE shall ignore all the priorities provided in system information. If UE is in camped on any cell state, UE shall only apply the priorities provided by system information from current cell, and the UE preserves priorities provided by dedicated signalling and deprioritisationReq received in RRCConnectionReject unless specified otherwise. When the UE in camped normally state, has only dedicated priorities other than for the current frequency, the UE shall consider the current frequency to be the lowest priority frequency (i.e. lower than any of the network configured values). While the UE is camped on a suitable CSG cell in normal coverage, the UE shall always consider the current frequency to be the highest priority frequency (i.e. higher than any of the network configured values), irrespective of any other priority value allocated to this frequency. When the HSDN capable UE is in High-mobility state, the UE shall always consider the HSDN cells to be the highest priority (i.e. higher than any other network configured priorities). When the HSDN capable UE is not in High-mobility state, the UE shall always consider HSDN cells to be the lowest priority (i.e. lower than network configured priorities). If the UE capable of sidelink communication is configured to perform sidelink communication and can only perform the sidelink communication while camping on a frequency, the UE may consider that frequency to be the highest priority. If the UE capable of V2X sidelink communication is configured to perform V2X sidelink communication and can only perform the V2X sidelink communication while camping on a frequency, the UE may consider that frequency to be the highest priority. If the UE capable of V2X sidelink communication is configured to perform V2X sidelink communication and can only use pre-configuration while not camping on a frequency, the UE may consider the frequency providing inter-carrier V2X sidelink configuration to be the highest priority. If the UE capable of sidelink discovery is configured to perform Public Safety related sidelink discovery and can only perform the Public Safety related sidelink discovery while camping on a frequency, the UE may consider that frequency to be the highest priority.

NOTE 1: The prioritization among the frequencies which UE considers to be the highest priority frequency is left to UE implementation.

If the UE is capable either of MBMS Service Continuity or of SC-PTM reception and is receiving or interested to receive an MBMS service and can only receive this MBMS service while camping on a frequency on which it is provided, the UE may consider that frequency to be the highest priority during the MBMS session TS 36.300 [2] as long as the two following conditions are fulfilled:

1) Either:

– the UE is capable of MBMS service continuity and the reselected cell is broadcasting SIB13; or

– the UE is capable of SC-PTM reception and the reselected cell is broadcasting SIB20;

2) Either:

– SIB15 of the serving cell indicates for that frequency one or more MBMS SAIs included and associated with that frequency in the MBMS User Service Description (USD) TS 26.346 [22] of this service; or

– SIB15 is not broadcast in the serving cell and that frequency is included in the USD of this service.

If the UE is capable either of MBMS Service Continuity or of SC-PTM reception and is receiving or interested to receive an MBMS service provided on a downlink only MBMS frequency, on a frequency used by dedicated MBMS cells, on a frequency used by FeMBMS/Unicast-mixed cells as defined in TS 36.300 [2], or on a frequency belonging to PLMN different from its registered PLMN, the UE may consider cell reselection candidate frequencies at which it cannot receive the MBMS service to be of the lowest priority during the MBMS session TS 36.300 [2], as long as the above mentioned condition 1) is fulfilled for the cell on the MBMS frequency which the UE monitors or this cell broadcasts SIB1-MBMS and as long as the above mentioned condition 2) is fulfilled for the serving cell.

NOTE 2: Example scenarios in which the previous down-prioritisation may be needed concerns the cases where camping is not possible, while the UE can only receive this MBMS frequency when camping on a subset of cell reselection candidate frequencies, e.g. the MBMS frequency is a downlink only carrier, the MBMS frequency is used by dedicated MBMS cells, the MBMS frequency is used by FeMBMS/Unicast-mixed cells TS 36.300 [2], or the MBMS frequency belongs to a PLMN different from UE’s registered PLMN.

If the UE is not capable of MBMS Service Continuity but has knowledge on which frequency an MBMS service of interest is provided, it may consider that frequency to be the highest priority during the MBMS session TS 36.300 [2] as long as the reselected cell is broadcasting SIB13.

If the UE is not capable of MBMS Service Continuity but has knowledge on which downlink only frequency, on which frequency used by dedicated MBMS cells, on which frequency used by FeMBMS/Unicast-mixed cells as defined in TS 36.300 [2] or on which frequency belonging to PLMN different from its registered PLMN an MBMS service of interest is provided, it may consider cell reselection candidate frequencies at which it cannot receive the MBMS service to be of the lowest priority during the MBMS session TS 36.300 [2] as long as the cell on the MBMS frequency which the UE monitors is broadcasting SIB13 or SIB1-MBMS.

NOTE 3: The UE considers that the MBMS session is ongoing using the session start and end times as provided by upper layers in the USD i.e. the UE does not verify if the session is indicated on MCCH.

In case UE receives RRCConnectionReject with deprioritisationReq, UE shall consider current carrier frequency and stored frequencies due to the previously received RRCConnectionReject with deprioritisationReq or all the frequencies of EUTRA to be the lowest priority frequency (i.e. lower than any of the network configured values) while T325 is running irrespective of camped RAT. The UE shall delete the stored deprioritisation request(s) when a PLMN selection is performed on request by NAS TS 23.122 [5].

NOTE 4: Connecting to CDMA2000 does not imply PLMN selection.

NOTE 5: UE should search for a higher priority layer for cell reselection as soon as possible after the change of priority. The minimum related performance requirements specified in TS 36.133 [10] are still applicable.

The UE shall delete priorities provided by dedicated signalling when:

– the UE enters a different RRC state; or

– the optional validity time of dedicated priorities (T320) expires; or

– a PLMN selection is performed on request by NAS TS 23.122 [5].

NOTE 6: Equal priorities between RATs are not supported.

The UE shall only perform cell reselection evaluation for E-UTRAN frequencies and inter-RAT frequencies that are given in system information and for which the UE has a priority provided.

The UE shall not consider any black listed cells as candidate for cell reselection.

The UE shall inherit the priorities provided by dedicated signalling and the remaining validity time (i.e., T320 in E-UTRA and NR, T322 in UTRA and T3230 in GERAN), if configured, at inter-RAT cell (re)selection.

NOTE 7: The network may assign dedicated cell reselection priorities for frequencies not configured by system information.

While T360 is running, redistribution target is considered to be the highest priority (i.e. higher than any of the network configured values). UE shall continue to consider the serving frequency as the highest priority until completion of E-UTRAN Inter-frequency Redistribution procedure specified in 5.2.4.10 if triggered on T360 expiry/ stop.

[TS 36.304, clause 5.2.4.2]

For NB-IoT measurement rules for cell re-selection is defined in sub-clause 5.2.4.2.a.

When evaluating Srxlev and Squal of non-serving cells for reselection purposes, the UE shall use parameters provided by the serving cell.

Following rules are used by the UE to limit needed measurements:

– If the serving cell fulfils Srxlev > SIntraSearchP and Squal > SIntraSearchQ, the UE may choose not to perform intra-frequency measurements.

– Otherwise, the UE shall perform intra-frequency measurements.

– The UE shall apply the following rules for E-UTRAN inter-frequencies and inter-RAT frequencies which are indicated in system information and for which the UE has priority provided as defined in 5.2.4.1:

– For an E-UTRAN inter-frequency or inter-RAT frequency with a reselection priority higher than the reselection priority of the current E-UTRA frequency the UE shall perform measurements of higher priority E-UTRAN inter-frequency or inter-RAT frequencies according to TS 36.133 [10].

– For an E-UTRAN inter-frequency with an equal or lower reselection priority than the reselection priority of the current E-UTRA frequency and for inter-RAT frequency with lower reselection priority than the reselection priority of the current E-UTRAN frequency:

– If the serving cell fulfils Srxlev > SnonIntraSearchP and Squal > SnonIntraSearchQ, the UE may choose not to perform measurements of E-UTRAN inter-frequencies or inter-RAT frequency cells of equal or lower priority unless the UE is triggered to measure an E-UTRAN inter-frequency which is configured with redistributionInterFreqInfo.

– Otherwise, the UE shall perform measurements of E-UTRAN inter-frequencies or inter-RAT frequency cells of equal or lower priority according to TS 36.133 [10].

– If the UE supports relaxed monitoring and s-SearchDeltaP is present in SystemInformationBlockType3, the UE may further limit the needed measurements, as specified in sub-clause 5.2.4.12.

[TS 36.304, clause 5.2.4.5]

For NB-IoT inter-frequency cell reselection shall be based on ranking as defined in sub-clause 5.2.4.6.

If threshServingLowQ is provided in SystemInformationBlockType3 and more than 1 second has elapsed since the UE camped on the current serving cell, cell reselection to a cell on a higher priority E-UTRAN frequency or inter-RAT frequency than the serving frequency shall be performed if:

– A cell of a higher priority EUTRAN, NR or UTRAN FDD RAT/ frequency fulfils Squal > ThreshX, HighQ during a time interval TreselectionRAT; or

– A cell of a higher priority UTRAN TDD, GERAN or CDMA2000 RAT/ frequency fulfils Srxlev > ThreshX, HighP during a time interval TreselectionRAT.

Otherwise, cell reselection to a cell on a higher priority E-UTRAN frequency or inter-RAT frequency than the serving frequency shall be performed if:

– A cell of a higher priority RAT/ frequency fulfils Srxlev > ThreshX, HighP during a time interval TreselectionRAT; and

– More than 1 second has elapsed since the UE camped on the current serving cell.

Cell reselection to a cell on an equal priority E-UTRAN frequency shall be based on ranking for Intra-frequency cell reselection as defined in sub-clause 5.2.4.6.

If threshServingLowQ is provided in SystemInformationBlockType3 and more than 1 second has elapsed since the UE camped on the current serving cell, cell reselection to a cell on a lower priority E-UTRAN frequency or inter-RAT frequency than the serving frequency shall be performed if:

– The serving cell fulfils Squal < ThreshServing, LowQ and a cell of a lower priority EUTRAN, NR or UTRAN FDD RAT/ frequency fulfils Squal > ThreshX, LowQ during a time interval TreselectionRAT; or

– The serving cell fulfils Squal < ThreshServing, LowQ and a cell of a lower priority UTRAN TDD, GERAN or CDMA2000 RAT/ frequency fulfils Srxlev > ThreshX, LowP during a time interval TreselectionRAT.

Otherwise, cell reselection to a cell on a lower priority E-UTRAN frequency or inter-RAT frequency than the serving frequency shall be performed if:

– The serving cell fulfils Srxlev < ThreshServing, LowP and a cell of a lower priority RAT/ frequency fulfils Srxlev > ThreshX, LowP during a time interval TreselectionRAT; and

– More than 1 second has elapsed since the UE camped on the current serving cell.

Cell reselection to a higher priority RAT/ frequency shall take precedence over a lower priority RAT/ frequency, if multiple cells of different priorities fulfil the cell reselection criteria.

The UE shall not perform cell reselection to NR or UTRAN FDD cells for which the cell selection criterion S is not fulfilled.

For cdma2000 RATs, Srxlev is equal to -FLOOR(-2 x 10 x log10 Ec/Io) in units of 0.5 dB, as defined in [18], with Ec/Io referring to the value measured from the evaluated cell.

For cdma2000 RATs, ThreshX, HighP and ThreshX, LowP are equal to -1 times the values signalled for the corresponding parameters in the system information.

In all the above criteria the value of TreselectionRAT is scaled when the UE is in the medium or high mobility state as defined in subclause 5.2.4.3.1. If more than one cell meets the above criteria, the UE shall reselect a cell as follows:

– If the highest-priority frequency is an E-UTRAN frequency, a cell ranked as the best cell among the cells on the highest priority frequency(ies) meeting the criteria according to clause 5.2.4.6;

– If the highest-priority frequency is from another RAT, a cell ranked as the best cell among the cells on the highest priority frequency(ies) meeting the criteria of that RAT.

Cell reselection to another RAT, for which Squal based cell reselection parameters are broadcast in system information, shall be performed based on the Squal criteria if the UE supports Squal (RSRQ) based cell reselection to E-UTRAN from all the other RATs provided by system information which UE supports. Otherwise, cell reselection to another RAT shall be performed based on Srxlev criteria.

Cell reselection to NR, for which a cell reselection parameter, q-RxLevMinSUL is broadcast in system information and the UE supports SUL, shall be performed based on Srxlev criteria taking the parameter into account.

6.2.3.10.3 Test description

6.2.3.10.3.1 Pre-test conditions

System Simulator:

– E-UTRA Cell 1, NR Cell 1.

– System information combination 1 as defined in TS 36.508 [7] clause 4.4.3.1 is used in E-UTRA Cell 1. SystemInformationBlockType1 is broadcasted with extended fields as specified in Table 6.2.3.10.3.3-1. And SystemInformationBlockType24 is broadcasted according to scheduling information specified in Table 6.2.3.10.3.3-1.

– System information combination NR-1 defined in TS 38.508-1 [4] clause 4.4.3.1.3 is used in NR Cell 1.

UE:

– None.

Preamble:

– With E-UTRA Cell 1 "Non-suitable "Off" cell" and NR Cell 1 "Serving cell" in accordance with TS 38.508-1 [4], Table 6.2.2.1-3, the UE is brought to state RRC_CONNECTED 1N-A, Connectivity (NR), in accordance with the procedure described in TS 38.508-1 [4], Table 4.5.2.2-2. 5G-GUTI and ngKSI are assigned and security context established.

– The UE is switched-off

– With E-UTRA Cell 1 "Serving cell" and NR Cell 1 "Non-suitable "Off" cell" in accordance with TS 38.508-1 [4], Table 6.2.2.1-3, the UE is brought to state RRC_IDLE using generic procedure parameters Connectivity (E-UTRA/EPC) and Unrestricted nr PDN (On) in accordance with the procedure described in TS 38.508-1 [4], clause 4.5. 4. 4G GUTI and eKSI are assigned and security context established.

6.2.3.10.3.2 Test procedure sequence

Table 6.2.3.10.3.2-1/2 illustrate the downlink power levels and other changing parameters to be applied for the cell at various time instants of the test execution. The exact instants on which these values shall be applied are described in the texts in this clause. Row marked "T0" denotes the conditions in the preamble. Configurations marked "T1", "T2" and "T3" are applied at the points indicated in the Main behaviour description in Table 6.2.3.10.3.2-3.

Table 6.2.3.10.3.2-1: Time instances of cell power level and parameter changes for E-UTRA Cell 1 and NR Cell 1 in FR1

Parameter

Unit

E-UTRA

Cell 1

NR

Cell 1

Remark

T0

Cell-specific RS EPRE

dBm/15kHz

-85

The power level values are assigned to ensure UE registered on E-UTRA cell 1

SS/PBCH

SSS EPRE

dBm/SCS

Off

T1

Cell-specific RS EPRE

dBm/15kHz

-95

The power level values are assigned to satisfy both SrxlevNR Cell 1 > Threshx, low and SrxlevE-UTRA Cell 1 < Threshserving, low

SS/PBCH

SSS EPRE

dBm/SCS

-80

Note1: Power level “Off” is defined in TS 38.508-1 [4] Table 6.2.2.1-3.

Table 6.2.3.10.3.2-2: Time instances of cell power level and parameter changes for E-UTRA Cell 1 and NR Cell 1 in FR2

Parameter

Unit

E-UTRA Cell 1

NR

Cell 1

Remark

T0

Cell-specific RS EPRE

dBm/15kHz

-82

The power level values are assigned to ensure UE registered on E-UTRA cell 1

SS/PBCH

SSS EPRE

dBm/SCS

Off

T1

Cell-specific RS EPRE

dBm/15kHz

-98

The power level values are assigned to satisfy both SrxlevNR Cell 1 > Threshx, low and SrxlevE-UTRA Cell 1 < Threshserving, low

SS/PBCH

SSS EPRE

dBm/SCS

-78

Note1: Power level “Off” is defined in TS 38.508-1 [4] Table 6.2.2.1-3.

Table 6.2.3.10.3.2-3: Main behaviour

St

Procedure

Message Sequence

TP

Verdict

U – S

Message

1

The SS adjusts the E-UTRAN and NR Cell power levels according to row "T1" in table 6.2.3.10.3.2-1/2.

1A

Wait for 1s (Note 2).

1B

The SS transmits an RRCConnectionRelease message to release RRC connection and move to E-UTRA RRC_IDLE.

<–

RRC: RRCConnectionRelease

2

Check: Does the test result of generic test procedure in TS 38.508-1 [4] Table 4.9.9.2.2-1 indicate that the UE is camped on NR Cell 1 within 34s for FR1 or 130s for FR2? (Note 1)

1

P

Note 1: The wait time for reselection to an newly detected Inter-RAT NR cell is selected to cover Tdetect,NR (32s for FR1 and 4*32s=128s for FR2) + TSI-NR (1280 ms system information block type scheduling) = 33.28s rounded up to 34s for FR1 and 129.28s rounded up to 130s for FR2.

Note 2: The wait time 1 sec is added to allow the NR cell to be setup before RRC is released on E-UTRAN. This will avoid the UE to miss the Tdetect,NR window if the NR cell is not up.

6.2.3.10.3.3 Specific message contents

Table 6.2.3.10.3.3-1: SystemInformationBlockType1 for cell 1 (preamble and all steps, Table 6.2.3.11.3.2-3)

Derivation Path: TS 36.508 [7], Table 4.4.3.2-3

Information Element

Value/Remark

Comment

Condition

SystemInformationBlockType1 ::= SEQUENCE {

nonCriticalExtension SEQUENCE {

lateNonCriticalExtension SEQUENCE {

nonCriticalExtension SEQUENCE {

nonCriticalExtension SEQUENCE {

nonCriticalExtension SEQUENCE {

nonCriticalExtension SEQUENCE {

nonCriticalExtension SEQUENCE {

schedulingInfoList-v12j0 SEQUENCE (SIZE (1..maxSI-Message)) OF SEQUENCE {

2 entries

It includes the same number of entries, and listed in the same order, as in schedulingInfoList (without suffix).

SchedulingInfo-v12j0[1] SEQUENCE {

entry 1

SIB-MappingInfo-v12j0

Not present

}

SchedulingInfo-v12j0[2] SEQUENCE {

entry 2

SIB-MappingInfo-v12j0 SEQUENCE (SIZE (1..maxSIB-1)) OF SIB-Type-v12j0 {

1 entry

SIB-Type-v12j0[1]

sibType24-v1530

entry 2, SIB24 is mapped into the SI message scheduled via the second entry of schedulingInfoList (without suffix)

}

}

}

}

}

}

}

}

}

}

}

Table 6.2.3.10.3.3-2: SystemInformationBlockType3 of EUTRA Cell 1 (preamble and all steps, Table 6.2.3.10.3.2-3)

Derivation Path: TS 36.508 [7], Table 4.4.3.3-2

Information Element

Value/remark

Comment

Condition

SystemInformationBlockType3 ::= SEQUENCE {

cellReselectionServingFreqInfo SEQUENCE {

threshServingLow

10

20 dB

}

}

Table 6.2.3.10.3.3-3: SystemInformationBlockType24 of EUTRA Cell 1 (preamble and all steps, Table 6.2.3.10.3.2-3)

Derivation path: TS 36.508 [7], Table 4.4.3.3-20

Information Element

Value/Remark

Comment

Condition

SystemInformationBlockType24-r15 ::= SEQUENCE {

carrierFreqListNR-r15 SEQUENCE (SIZE (1..maxFreq)) OF CarrierFreqNR-r15 {

1 entry

CarrierFreqNR-r15[1] SEQUENCE {

entry 1

carrierFreq-r15

Downlink NR ARFCN of SSB for NR Cell 1

cellReselectionPriority-r15

3

threshX-Low-r15

10

20 dB

}

}

}

6.2.3.11 Inter-RAT cell reselection / From E-UTRA_IDLE to NR RRC_IDLE / schedulingInfoListExt-r12

6.2.3.11.1 Test Purpose (TP)

(1)

with { the UE is in E-UTRA IDLE state and SystemInformationBlockType24 scheduled by optional extended field schedulingInfoListExt-r12 in SystemInformationBlockType1 is broadcasted }

ensure that {

when { UE detects the cell re-selection criteria is met for a lower priority NR cell }

then { UE reselects to the NR cell }

}

6.2.3.11.2 Conformance requirements

References: The conformance requirements covered in the current TC are specified in: TS 36.331, clause 5.2.3 and 5.2.3a and TS 36.304, clause 5.2.4.1, 5.2.4.2 and 5.2.4.5. Unless otherwise stated these are Rel-15 requirements.

[TS 36.331, clause 5.2.3]

When acquiring an SI message, the UE shall:

1> determine the start of the SI-window for the concerned SI message as follows:

2> if the concerned SI message is configured in the schedulingInfoList, schedulingInfoListExt (if present) or if the concerned SI message is configured in the pos-schedulingInfoList and si-posOffset is not configured;

3> for the concerned SI message, determine the number n which corresponds to the order of entry in the concatenated list of SI messages configured by schedulingInfoList, schedulingInfoListExt (if present) and posSchedulingInfoList in SystemInformationBlockType1;

3> determine the integer value x = (n – 1)*w, where w is the si-WindowLength;

3> the SI-window starts at the subframe #a, where a = x mod 10, in the radio frame for which SFN mod T = FLOOR(x/10), where T is the si-Periodicity of the concerned SI message;

2> else if the concerned SI message is configured by the posSchedulingInfoList and si-posOffset is configured determine the start of the SI-window for the concerned SI message as follows:

3> determine the number m which corresponds to the number of SI messages with an associated si-Periodicity of 8 radio frames (80 ms), configured by schedulingInfoList and schedulingInfoListExt (if present) in SystemInformationBlockType1;

3> for the concerned SI message, determine the number n which corresponds to the order of entry in the list of SI messages configured by posSchedulingInfoList in SystemInformationBlockType1;

3> determine the integer value x = m*w + (n – 1)*w, where w is the si-WindowLength

3> the SI-window starts at the subframe #a, where a = x mod 10, in the radio frame for which SFN mod T = FLOOR(x/10) + 8, where T is the si-posPeriodicity of the concerned SI message;

NOTE: E-UTRAN should configure an SI-window of 1 ms only if all SIs are scheduled before subframe #5 in radio frames for which SFN mod 2 = 0.

1> receive DL-SCH using the SI-RNTI from the start of the SI-window and continue until the end of the SI-window whose absolute length in time is given by si-WindowLength, or until the SI message was received, excluding the following subframes:

2> subframe #5 in radio frames for which SFN mod 2 = 0;

2> any MBSFN subframes;

2> any uplink subframes in TDD;

1> if the SI message was not received by the end of the SI-window, repeat reception at the next SI-window occasion for the concerned SI message;

[TS 36.331, clause 5.2.3a]

When acquiring an SI message, the BL UE or UE in CE or NB-IoT UE shall:

1> determine the start of the SI-window for the concerned SI message as follows:

2> if the concerned SI message is configured in the schedulingInfoList, schedulingInfoListExt (if present) or if the concerned SI message is configured in the pos-schedulingInfoList and si-posOffset is not configured;

3> for the concerned SI message, determine the number n which corresponds to the order of entry in the concatenated list of SI messages configured by schedulingInfoList, schedulingInfoListExt (if present) in SystemInformationBlockType1-BR (or SystemInformationBlockType1-NB in NB-IoT) and posSchedulingInfoList in SystemInformationBlockType1-BR;

3> determine the integer value x = (n – 1)*w, where w is the si-WindowLength-BR (or si-WindowLength in NB-IoT);

2> else if the concerned SI message is configured by the posSchedulingInfoList and si-posOffset is configured determine the start of the SI-window for the concerned SI message as follows:

3> determine the number m which corresponds to the number of SI messages with an associated si-Periodicity of 8 radio frames (80 ms), configured by schedulingInfoList and schedulingInfoListExt (if present) in SystemInformationBlockType1-BR;

3> for the concerned SI message, determine the number n which corresponds to the order of entry in the list of SI messages configured by posSchedulingInfoList in SystemInformationBlockType1-BR;

3> determine the integer value x = m*w + (n – 1)*w, where w is the si-WindowLength-BR;

3> the SI-window starts at the subframe #a, where a = x mod 10, in the radio frame for which SFN mod T = FLOOR(x/10) + 8, where T is the si-posPeriodicity of the concerned SI message;

2> if the UE is a NB-IoT UE:

3> the SI-window starts at the subframe #0 in the radio frame for which (H-SFN * 1024 + SFN) mod T = FLOOR(x/10) + Offset, where T is the si-Periodicity of the concerned SI message and, Offset is the offset of the start of the SI-Window (si-RadioFrameOffset);

2> else:

3> the SI-window starts at the subframe #0 in the radio frame for which SFN mod T = FLOOR(x/10), where T is the si-Periodicity of the concerned SI message;

1> if the UE is a NB-IoT UE:

2> receive and accumulate SI message transmissions on DL-SCH from the start of the SI-window and continue until the end of the SI-window whose absolute length in time is given by si-WindowLength, starting from the radio frames as provided in si-RepetitionPattern and in subframes as provided in downlinkBitmap, or until successful decoding of the accumulated SI message transmissions excluding the subframes used for transmission of NPSS, NSSS, MasterInformationBlock-NB/ MasterInformationBlock-TDD-NB and SystemInformationBlockType1-NB. If there are not enough subframes for one SI message transmission in the radio frames as provided in si-RepetitionPattern, the UE shall continue to receive the SI message transmission in the radio frames following the radio frame indicated in si-RepetitionPattern;

1> else:

2> receive and accumulate SI message transmissions on DL-SCH on narrowband provided by si-Narrowband, from the start of the SI-window and continue until the end of the SI-window whose absolute length in time is given by si-WindowLength-BR, only in radio frames as provided in si-RepetitionPattern and subframes as provided in fdd-DownlinkOrTddSubframeBitmapBR in bandwidthReducedAccessRelatedInfo, or until successful decoding of the accumulated SI message transmissions;

1> if the SI message was not possible to decode from the accumulated SI message transmissions by the end of the SI-window, continue reception and accumulation of SI message transmissions on DL-SCH in the next SI-window occasion for the concerned SI message;

[TS 36.304, clause 5.2.4.1]

Absolute priorities of different E-UTRAN frequencies or inter-RAT frequencies may be provided to the UE in the system information, in the RRCConnectionRelease message, or by inheriting from another RAT at inter-RAT cell (re)selection. In the case of system information, an E-UTRAN frequency or inter-RAT frequency may be listed without providing a priority (i.e. the field cellReselectionPriority is absent for that frequency). If priorities are provided in dedicated signalling, the UE shall ignore all the priorities provided in system information. If UE is in camped on any cell state, UE shall only apply the priorities provided by system information from current cell, and the UE preserves priorities provided by dedicated signalling and deprioritisationReq received in RRCConnectionReject unless specified otherwise. When the UE in camped normally state, has only dedicated priorities other than for the current frequency, the UE shall consider the current frequency to be the lowest priority frequency (i.e. lower than any of the network configured values). While the UE is camped on a suitable CSG cell in normal coverage, the UE shall always consider the current frequency to be the highest priority frequency (i.e. higher than any of the network configured values), irrespective of any other priority value allocated to this frequency. When the HSDN capable UE is in High-mobility state, the UE shall always consider the HSDN cells to be the highest priority (i.e. higher than any other network configured priorities). When the HSDN capable UE is not in High-mobility state, the UE shall always consider HSDN cells to be the lowest priority (i.e. lower than network configured priorities). If the UE capable of sidelink communication is configured to perform sidelink communication and can only perform the sidelink communication while camping on a frequency, the UE may consider that frequency to be the highest priority. If the UE capable of V2X sidelink communication is configured to perform V2X sidelink communication and can only perform the V2X sidelink communication while camping on a frequency, the UE may consider that frequency to be the highest priority. If the UE capable of V2X sidelink communication is configured to perform V2X sidelink communication and can only use pre-configuration while not camping on a frequency, the UE may consider the frequency providing inter-carrier V2X sidelink configuration to be the highest priority. If the UE capable of sidelink discovery is configured to perform Public Safety related sidelink discovery and can only perform the Public Safety related sidelink discovery while camping on a frequency, the UE may consider that frequency to be the highest priority.

NOTE 1: The prioritization among the frequencies which UE considers to be the highest priority frequency is left to UE implementation.

If the UE is capable either of MBMS Service Continuity or of SC-PTM reception and is receiving or interested to receive an MBMS service and can only receive this MBMS service while camping on a frequency on which it is provided, the UE may consider that frequency to be the highest priority during the MBMS session TS 36.300 [2] as long as the two following conditions are fulfilled:

1) Either:

– the UE is capable of MBMS service continuity and the reselected cell is broadcasting SIB13; or

– the UE is capable of SC-PTM reception and the reselected cell is broadcasting SIB20;

2) Either:

– SIB15 of the serving cell indicates for that frequency one or more MBMS SAIs included and associated with that frequency in the MBMS User Service Description (USD) TS 26.346 [22] of this service; or

– SIB15 is not broadcast in the serving cell and that frequency is included in the USD of this service.

If the UE is capable either of MBMS Service Continuity or of SC-PTM reception and is receiving or interested to receive an MBMS service provided on a downlink only MBMS frequency, on a frequency used by dedicated MBMS cells, on a frequency used by FeMBMS/Unicast-mixed cells as defined in TS 36.300 [2], or on a frequency belonging to PLMN different from its registered PLMN, the UE may consider cell reselection candidate frequencies at which it cannot receive the MBMS service to be of the lowest priority during the MBMS session TS 36.300 [2], as long as the above mentioned condition 1) is fulfilled for the cell on the MBMS frequency which the UE monitors or this cell broadcasts SIB1-MBMS and as long as the above mentioned condition 2) is fulfilled for the serving cell.

NOTE 2: Example scenarios in which the previous down-prioritisation may be needed concerns the cases where camping is not possible, while the UE can only receive this MBMS frequency when camping on a subset of cell reselection candidate frequencies, e.g. the MBMS frequency is a downlink only carrier, the MBMS frequency is used by dedicated MBMS cells, the MBMS frequency is used by FeMBMS/Unicast-mixed cells TS 36.300 [2], or the MBMS frequency belongs to a PLMN different from UE’s registered PLMN.

If the UE is not capable of MBMS Service Continuity but has knowledge on which frequency an MBMS service of interest is provided, it may consider that frequency to be the highest priority during the MBMS session TS 36.300 [2] as long as the reselected cell is broadcasting SIB13.

If the UE is not capable of MBMS Service Continuity but has knowledge on which downlink only frequency, on which frequency used by dedicated MBMS cells, on which frequency used by FeMBMS/Unicast-mixed cells as defined in TS 36.300 [2] or on which frequency belonging to PLMN different from its registered PLMN an MBMS service of interest is provided, it may consider cell reselection candidate frequencies at which it cannot receive the MBMS service to be of the lowest priority during the MBMS session TS 36.300 [2] as long as the cell on the MBMS frequency which the UE monitors is broadcasting SIB13 or SIB1-MBMS.

NOTE 3: The UE considers that the MBMS session is ongoing using the session start and end times as provided by upper layers in the USD i.e. the UE does not verify if the session is indicated on MCCH.

In case UE receives RRCConnectionReject with deprioritisationReq, UE shall consider current carrier frequency and stored frequencies due to the previously received RRCConnectionReject with deprioritisationReq or all the frequencies of EUTRA to be the lowest priority frequency (i.e. lower than any of the network configured values) while T325 is running irrespective of camped RAT. The UE shall delete the stored deprioritisation request(s) when a PLMN selection is performed on request by NAS TS 23.122 [5].

NOTE 4: Connecting to CDMA2000 does not imply PLMN selection.

NOTE 5: UE should search for a higher priority layer for cell reselection as soon as possible after the change of priority. The minimum related performance requirements specified in TS 36.133 [10] are still applicable.

The UE shall delete priorities provided by dedicated signalling when:

– the UE enters a different RRC state; or

– the optional validity time of dedicated priorities (T320) expires; or

– a PLMN selection is performed on request by NAS TS 23.122 [5].

NOTE 6: Equal priorities between RATs are not supported.

The UE shall only perform cell reselection evaluation for E-UTRAN frequencies and inter-RAT frequencies that are given in system information and for which the UE has a priority provided.

The UE shall not consider any black listed cells as candidate for cell reselection.

The UE shall inherit the priorities provided by dedicated signalling and the remaining validity time (i.e., T320 in E-UTRA and NR, T322 in UTRA and T3230 in GERAN), if configured, at inter-RAT cell (re)selection.

NOTE 7: The network may assign dedicated cell reselection priorities for frequencies not configured by system information.

While T360 is running, redistribution target is considered to be the highest priority (i.e. higher than any of the network configured values). UE shall continue to consider the serving frequency as the highest priority until completion of E-UTRAN Inter-frequency Redistribution procedure specified in 5.2.4.10 if triggered on T360 expiry/ stop.

[TS 36.304, clause 5.2.4.2]

For NB-IoT measurement rules for cell re-selection is defined in sub-clause 5.2.4.2.a.

When evaluating Srxlev and Squal of non-serving cells for reselection purposes, the UE shall use parameters provided by the serving cell.

Following rules are used by the UE to limit needed measurements:

– If the serving cell fulfils Srxlev > SIntraSearchP and Squal > SIntraSearchQ, the UE may choose not to perform intra-frequency measurements.

– Otherwise, the UE shall perform intra-frequency measurements.

– The UE shall apply the following rules for E-UTRAN inter-frequencies and inter-RAT frequencies which are indicated in system information and for which the UE has priority provided as defined in 5.2.4.1:

– For an E-UTRAN inter-frequency or inter-RAT frequency with a reselection priority higher than the reselection priority of the current E-UTRA frequency the UE shall perform measurements of higher priority E-UTRAN inter-frequency or inter-RAT frequencies according to TS 36.133 [10].

– For an E-UTRAN inter-frequency with an equal or lower reselection priority than the reselection priority of the current E-UTRA frequency and for inter-RAT frequency with lower reselection priority than the reselection priority of the current E-UTRAN frequency:

– If the serving cell fulfils Srxlev > SnonIntraSearchP and Squal > SnonIntraSearchQ, the UE may choose not to perform measurements of E-UTRAN inter-frequencies or inter-RAT frequency cells of equal or lower priority unless the UE is triggered to measure an E-UTRAN inter-frequency which is configured with redistributionInterFreqInfo.

– Otherwise, the UE shall perform measurements of E-UTRAN inter-frequencies or inter-RAT frequency cells of equal or lower priority according to TS 36.133 [10].

– If the UE supports relaxed monitoring and s-SearchDeltaP is present in SystemInformationBlockType3, the UE may further limit the needed measurements, as specified in sub-clause 5.2.4.12.

[TS 36.304, clause 5.2.4.5]

For NB-IoT inter-frequency cell reselection shall be based on ranking as defined in sub-clause 5.2.4.6.

If threshServingLowQ is provided in SystemInformationBlockType3 and more than 1 second has elapsed since the UE camped on the current serving cell, cell reselection to a cell on a higher priority E-UTRAN frequency or inter-RAT frequency than the serving frequency shall be performed if:

– A cell of a higher priority EUTRAN, NR or UTRAN FDD RAT/ frequency fulfils Squal > ThreshX, HighQ during a time interval TreselectionRAT; or

– A cell of a higher priority UTRAN TDD, GERAN or CDMA2000 RAT/ frequency fulfils Srxlev > ThreshX, HighP during a time interval TreselectionRAT.

Otherwise, cell reselection to a cell on a higher priority E-UTRAN frequency or inter-RAT frequency than the serving frequency shall be performed if:

– A cell of a higher priority RAT/ frequency fulfils Srxlev > ThreshX, HighP during a time interval TreselectionRAT; and

– More than 1 second has elapsed since the UE camped on the current serving cell.

Cell reselection to a cell on an equal priority E-UTRAN frequency shall be based on ranking for Intra-frequency cell reselection as defined in sub-clause 5.2.4.6.

If threshServingLowQ is provided in SystemInformationBlockType3 and more than 1 second has elapsed since the UE camped on the current serving cell, cell reselection to a cell on a lower priority E-UTRAN frequency or inter-RAT frequency than the serving frequency shall be performed if:

– The serving cell fulfils Squal < ThreshServing, LowQ and a cell of a lower priority EUTRAN, NR or UTRAN FDD RAT/ frequency fulfils Squal > ThreshX, LowQ during a time interval TreselectionRAT; or

– The serving cell fulfils Squal < ThreshServing, LowQ and a cell of a lower priority UTRAN TDD, GERAN or CDMA2000 RAT/ frequency fulfils Srxlev > ThreshX, LowP during a time interval TreselectionRAT.

Otherwise, cell reselection to a cell on a lower priority E-UTRAN frequency or inter-RAT frequency than the serving frequency shall be performed if:

– The serving cell fulfils Srxlev < ThreshServing, LowP and a cell of a lower priority RAT/ frequency fulfils Srxlev > ThreshX, LowP during a time interval TreselectionRAT; and

– More than 1 second has elapsed since the UE camped on the current serving cell.

Cell reselection to a higher priority RAT/ frequency shall take precedence over a lower priority RAT/ frequency, if multiple cells of different priorities fulfil the cell reselection criteria.

The UE shall not perform cell reselection to NR or UTRAN FDD cells for which the cell selection criterion S is not fulfilled.

For cdma2000 RATs, Srxlev is equal to -FLOOR(-2 x 10 x log10 Ec/Io) in units of 0.5 dB, as defined in [18], with Ec/Io referring to the value measured from the evaluated cell.

For cdma2000 RATs, ThreshX, HighP and ThreshX, LowP are equal to -1 times the values signalled for the corresponding parameters in the system information.

In all the above criteria the value of TreselectionRAT is scaled when the UE is in the medium or high mobility state as defined in subclause 5.2.4.3.1. If more than one cell meets the above criteria, the UE shall reselect a cell as follows:

– If the highest-priority frequency is an E-UTRAN frequency, a cell ranked as the best cell among the cells on the highest priority frequency(ies) meeting the criteria according to clause 5.2.4.6;

– If the highest-priority frequency is from another RAT, a cell ranked as the best cell among the cells on the highest priority frequency(ies) meeting the criteria of that RAT.

Cell reselection to another RAT, for which Squal based cell reselection parameters are broadcast in system information, shall be performed based on the Squal criteria if the UE supports Squal (RSRQ) based cell reselection to E-UTRAN from all the other RATs provided by system information which UE supports. Otherwise, cell reselection to another RAT shall be performed based on Srxlev criteria.

Cell reselection to NR, for which a cell reselection parameter, q-RxLevMinSUL is broadcast in system information and the UE supports SUL, shall be performed based on Srxlev criteria taking the parameter into account.

6.2.3.11.3 Test description

6.2.3.11.3.1 Pre-test conditions

System Simulator:

– E-UTRA Cell 1, NR Cell 1.

– System information combination 1 as defined in TS 36.508 [7] clause 4.4.3.1 is used in E-UTRA Cell 1. SystemInformationBlockType1 is broadcasted with extended fields as specified in Table 6.2.3.11.3.3-1. And SystemInformationBlockType24 is broadcasted according to scheduling information specified in Table 6.2.3.11.3.3-1.

– System information combination NR-1 as defined in TS 38.508-1 [4] clause 4.4.3.1.3 is used in NR Cell 1.

UE:

– None.

Preamble:

– With E-UTRA Cell 1 "Non-suitable "Off" cell" and NR Cell 1 "Serving cell" in accordance with TS 38.508-1 [4], Table 6.2.2.1-3, the UE is brought to state RRC_CONNECTED 1N-A, Connectivity (NR), in accordance with the procedure described in TS 38.508-1 [4], Table 4.5.2.2-2. 5G-GUTI and ngKSI are assigned and security context established.

– the UE is switched-off

– With E-UTRA Cell 1 "Serving cell" and NR Cell 1 "Non-suitable "Off" cell" in accordance with TS 38.508-1 [4], Table 6.2.2.1-3, the UE is brought to state RRC_IDLE using generic procedure parameters Connectivity (E-UTRA/EPC) and Unrestricted nr PDN (On) in accordance with the procedure described in TS 38.508-1 [4], clause 4.5.4. 4G GUTI and eKSI are assigned and security context established.

6.2.3.11.3.2 Test procedure sequence

Table 6.2.3.11.3.2-1/2 illustrate the downlink power levels and other changing parameters to be applied for the cell at various time instants of the test execution. The exact instants on which these values shall be applied are described in the texts in this clause. Row marked "T0" denotes the conditions in the preamble. Configurations marked "T1", "T2" and "T3" are applied at the points indicated in the Main behaviour description in Table 6.2.3.11.3.2-3.

Table 6.2.3.11.3.2-1: Time instances of cell power level and parameter changes for E-UTRA Cell 1 and NR Cell 1 in FR1

Parameter

Unit

E-UTRA

Cell 1

NR

Cell 1

Remark

T0

Cell-specific RS EPRE

dBm/15kHz

-85

The power level values are assigned to ensure UE registered on E-UTRA cell 1

SS/PBCH

SSS EPRE

dBm/SCS

Off

T1

Cell-specific RS EPRE

dBm/15kHz

-95

The power level values are assigned to satisfy both SrxlevNR Cell 1 > Threshx, low and SrxlevE-UTRA Cell 1 < Threshserving, low

SS/PBCH

SSS EPRE

dBm/SCS

-80

Note1: Power level “Off” is defined in TS 38.508-1 [4] Table 6.2.2.1-3.

Table 6.2.3.11.3.2-2: Time instances of cell power level and parameter changes for E-UTRA Cell 1 and NR Cell 1 in FR2

Parameter

Unit

E-UTRA Cell 1

NRCell 1

Remark

T0

Cell-specific RS EPRE

dBm/15kHz

-82

The power level values are assigned to ensure UE registered on E-UTRA cell 1

SS/PBCH

SSS EPRE

dBm/SCS

Off

T1

Cell-specific RS EPRE

dBm/15kHz

-98

The power level values are assigned to satisfy both SrxlevNR Cell 1 > Threshx, low and SrxlevE-UTRA Cell 1 < Threshserving, low

SS/PBCH

SSS EPRE

dBm/SCS

-78

Note1: Power level “Off” is defined in TS 38.508-1 [4] Table 6.2.2.1-3.

Table 6.2.3.11.3.2-3: Main behaviour

St

Procedure

Message Sequence

TP

Verdict

U – S

Message

1

The SS adjusts the E-UTRAN and NR Cell power levels according to row "T1" in table 6.2.3.11.3.2-1/2.

1A

Wait for 1s (Note 2).

1B

The SS transmits an RRCConnectionRelease message to release RRC connection and move to E-UTRA RRC_IDLE.

<–

RRC: RRCConnectionRelease

2

Check: Does the test result of generic test procedure in TS 38.508-1 [4] Table 4.9.9.2.2-1 indicate that the UE is camped on NR Cell 1 within 34s for FR1 or 130s for FR2? (Note 1)

1

P

Note 1: The wait time for reselection to an newly detected Inter-RAT NR cell is selected to cover Tdetect,NR (32s for FR1 and 4*32s=128s for FR2) + TSI-NR (1280 ms system information block type scheduling) = 33.28s rounded up to 34s for FR1 and 129.28s rounded up to 130s for FR2.

Note 2: The wait time 1 sec is added to allow the NR cell to be setup before RRC is released on E-UTRAN. This will avoid the UE to miss the Tdetect,NR window if the NR cell is not up.

6.2.3.11.3.3 Specific message contents

Table 6.2.3.11.3.3-1: SystemInformationBlockType1 for E-UTRA Cell 1 (Preamble and all steps)

Derivation Path: TS 36.508 [7], Table 4.4.3.2-3

Information Element

Value/Remark

Comment

Condition

SystemInformationBlockType1 ::= SEQUENCE {

nonCriticalExtension SEQUENCE {

lateNonCriticalExtension SEQUENCE {

nonCriticalExtension SEQUENCE {

nonCriticalExtension SEQUENCE {

nonCriticalExtension SEQUENCE {

nonCriticalExtension SEQUENCE {

nonCriticalExtension SEQUENCE {

schedulingInfoListExt-r12 SEQUENCE (SIZE (1..maxSI-Message)) OF SchedulingInfoExt-r12 {

1 entry

SchedulingInfoExt-r12[1] SEQUENCE {

entry 1

si-Periodicity-r12

rf64

SIB-MappingInfo-v12j0 SEQUENCE (SIZE (1..maxSIB-1)) OF SIB-Type-v12j0 {

1 entry

SIB-Type-v12j0[1]

sibType24-v1530

entry 1

}

}

}

}

}

}

}

}

}

}

}

Table 6.2.3.11.3.3-2: SystemInformationBlockType3 of E-UTRA Cell 1 (preamble and all steps , Table 6.2.3.11.3.2-3)

Derivation Path: TS 36.508 [7], Table 4.4.3.3-2

Information Element

Value/remark

Comment

Condition

SystemInformationBlockType3 ::= SEQUENCE {

cellReselectionServingFreqInfo SEQUENCE {

threshServingLow

10

20 dB

}

}

Table 6.2.3.11.3.3-3: SystemInformationBlockType24 of E-UTRA Cell 1 (preamble and all steps, Table 6.2.3.11.3.2-3)

Derivation path: TS 36.508 [7], Table 4.4.3.3-20

Information Element

Value/Remark

Comment

Condition

SystemInformationBlockType24-r15 ::= SEQUENCE {

carrierFreqListNR-r15 SEQUENCE (SIZE (1..maxFreq)) OF CarrierFreqNR-r15 {

1 entry

CarrierFreqNR-r15[1] SEQUENCE {

entry 1

carrierFreq-r15

Downlink NR ARFCN of SSB for NR Cell 1

cellReselectionPriority-r15

3

threshX-Low-r15

10

20 dB

}

}

}