24.1.14 V2X Sidelink Communication / Pre-configured authorisation / UE in RRC_IDLE/RRC_Connected on an E-UTRAN cell operating on the carrier frequency for V2X configuration / SLSS and MasterInformationBlock-SL-V2X message Transmission

36.523-13GPPEvolved Universal Terrestrial Radio Access (E-UTRA) and Evolved Packet Core (EPC)Part 1: Protocol conformance specificationRelease 16TSUser Equipment (UE) conformance specification

24.1.14.1 Test Purpose (TP)

(1)

with { UE is authorized for performing V2X sidelink Communication, and UE is out of coverage on the frequency used for V2X sidelink communication, in RRC_CONNECTED on Cell1/f1/PLMN1 which is operating on the anchor carrier frequency as the one pre-configured in the UE/USIM and is broadcasting SystemInformationBlockType21; and has selected GNSS or the cell as synchronization source}

ensure that {

when { networkControlledSyncTx is not configured, and for the V2X sidelink Communication frequency syncTxThreshIC is configured, and the RSRP measurement of the reference cell for V2X sidelink communication transmission is below the value of syncTxThreshIC }

then { UE transmits SLSS and MasterInformationBlock-SL-V2X message on the frequency used for V2X sidelink communication }

}

(2)

with { UE is authorized for performing V2X sidelink Communication, and UE is out of coverage on the frequency used for V2X sidelink communication, in RRC_CONNECTED on Cell1/f1/PLMN1 which is operating on the anchor carrier frequency as the one pre-configured in the UE/USIM and is broadcasting SystemInformationBlockType21; and has selected GNSS or the cell as synchronization source }

ensure that {

when { networkControlledSyncTx is configured and set to on }

then { UE transmits SLSS and MasterInformationBlock-SL-V2X message on the frequency used for V2X sidelink communication }

}

(3)

with { UE is authorized for performing V2X sidelink Communication, and UE is out of coverage on the frequency used for V2X sidelink communication, in RRC_IDLE on Cell1/f1/PLMN1 which is operating on the anchor carrier frequency as the one pre-configured in the UE/USIM and is broadcasting SystemInformationBlockType21; and has selected GNSS or the cell as synchronization source }

ensure that {

when { for the V2X sidelink Communication frequency syncTxThreshIC is configured; and the RSRP measurement of the reference cell for V2X sidelink communication transmission is below the value of syncTxThreshIC }

then { UE transmits SLSS and MasterInformationBlock-SL-V2X message on the frequency used for V2X sidelink communication }

}

(4)

with { UE is authorized for performing V2X sidelink Communication, and UE is out of coverage on the frequency used for V2X sidelink communication, in RRC_IDLE on Cell1/f1/PLMN1 which is operating on the anchor carrier frequency as the one pre-configured in the UE/USIM and is broadcasting SystemInformationBlockType21; and typeTxSync for the concerned frequency is set to gnss }

ensure that {

when { There isn’t reliable GNSS in accordance with TS 36.101 and TS 36.133. UE detects a SLSS=0 SyncRef UE with S-RSRP exceeds the minimum requirement defined in TS 36.133 }

then { UE select the SyncRef UE as synchronization source }

}

(5)

with { UE is authorized for performing V2X sidelink Communication, and UE is out of coverage on the frequency used for V2X sidelink communication, in RRC_IDLE on Cell1/f1/PLMN1 which is operating on the anchor carrier frequency as the one pre-configured in the UE/USIM and is broadcasting SystemInformationBlockType21; and typeTxSync for the concerned frequency is set to gnss }

ensure that {

when { There isn’t reliable GNSS in accordance with TS 36.101 and TS 36.133. UE can’t detect a SLSS=0 SyncRef UE with S-RSRP exceeds the minimum requirement defined in TS 36.133 }

then { UE select eNB as synchronization source }

}

24.1.14.2 Conformance requirements

References: The conformance requirements covered in the current TC are specified in: TS 36.331 subclause 5.10.7.1, 5.10.7.2, 5.10.7.3, 5.10.7.4 and 5.10.8.2.

[TS 36.331, clause 5.10.7.1]

Figure 5.10.7.1-1: Synchronisation information transmission for sidelink communication or V2X sidelink communication, in (partial) coverage

Figure 5.10.7.1-2: Synchronisation information transmission for sidelink communication or V2X sidelink communication / sidelink discovery, out of coverage

The purpose of this procedure is to provide synchronisation information to a UE. For sidelink discovery, the synchronisation information concerns a Sidelink Synchronisation Signal (SLSS) and, in case of PS related discovery, also timing information and some additional configuration parameters (i.e. the MasterInformationBlock-SL message), while for sidelink communication or V2X sidelink communication it concerns an SLSS and the MasterInformationBlock-SL or MasterInformationBlock-SL-V2X message. A UE transmits synchronisation information either when E-UTRAN configures it to do so by dedicated signalling (i.e. network based), or when not configured by dedicated signalling (i.e. UE based) and E-UTRAN broadcasts (in coverage) or pre-configures a threshold (out of coverage).

The synchronisation information transmitted by the UE may be derived from information/ signals received from E-UTRAN (in coverage) or received from a UE acting as synchronisation reference for the transmitting UE or received from GNSS. In the remainder, the UE acting as synchronisation reference is referred to as SyncRef UE.

[TS 36.331, clause 5.10.7.2]

A UE capable of V2X sidelink communication and SLSS/PSBCH transmission shall, when transmitting non-P2X related V2X sidelink communication in accordance with 5.10.13, and if the conditions for V2X sidelink communication operation as defined in 5.10.1d are met and when the following conditions are met:

1> if in coverage on the frequency used for V2X sidelink communication, as defined in TS 36.304 [4, 11.4]; and has selected GNSS or the cell as synchronization reference as defined in 5.10.13.3; or

1> if out of coverage on the frequency used for V2X sidelink communication, as defined in TS 36.304 [4, 11.4], and the frequency used to transmit V2X sidelink communication is included in v2x-InterFreqInfoList in RRCConnectionReconfiguration or in v2x-InterFreqInfoList within SystemInformationBlockType21 of the serving cell/ PCell; and has selected GNSS or the cell as synchronization reference as defined in 5.10.13.3:

2> if in RRC_CONNECTED; and if networkControlledSyncTx is configured and set to on; or

2> if networkControlledSyncTx is not configured; and for the concerned frequency syncTxThreshIC is configured; and the RSRP measurement of the reference cell, selected as defined in 5.10.13.3, for V2X sidelink communication transmission is below the value of syncTxThreshIC:

3> transmit SLSS on the frequency used for V2X sidelink communication in accordance with 5.10.7.3 and TS 36.211 [21];

3> transmit the MasterInformationBlock-SL-V2X message on the frequency used for V2X sidelink communication, in the same subframe as SLSS, and in accordance with 5.10.7.4;

1> else:

2> for the frequency used for V2X sidelink communication, if syncOffsetIndicators is included in SL-V2X-Preconfiguration:

3> if syncTxThreshOoC is included in SL-V2X-Preconfiguration; and the UE is not directly synchronized to GNSS, and the UE has no selected SyncRef UE or the S-RSRP measurement result of the selected SyncRef UE is below the value of syncTxThreshOoC; or

3> if the UE selects GNSS as the synchronization reference source:

4> transmit SLSS in accordance with 5.10.7.3 and TS 36.211 [21];

4> transmit the MasterInformationBlock-SL-V2X message, in the same subframe as SLSS, and in accordance with 5.10.7.4;

[TS 36.331, clause 5.10.7.3]

The UE shall select the SLSSID and the subframe in which to transmit SLSS as follows:

1> if triggered by V2X sidelink communication and in coverage on the frequency used for V2X sidelink communication, as defined in TS 36.304 [4, 11.4]; or

1> if triggered by V2X sidelink communication, and out of coverage on the frequency used for V2X sidelink communication, and the concerned frequency is included in v2x-InterFreqInfoList in RRCConnectionReconfiguration or in v2x-InterFreqInfoList within SystemInformationBlockType21 of the serving cell/ PCell;

2> if the UE has selected GNSS as synchronization reference in accordance with 5.10.8.2:

3> select SLSSID 0;

3> use syncOffsetIndicator included in the entry of v2x-SyncConfig corresponding to the concerned frequency in v2x-InterFreqInfoList, that includes txParameters and gnss-Sync;

3> select the subframe(s) indicated by syncOffsetIndicator;

2> if the UE has selected a cell as synchronization reference in accordance with 5.10.8.2:

3> select the SLSSID included in the entry of v2x-SyncConfig configured for the concerned frequency, that includes txParameters and does not include gnss-Sync;

3> use syncOffsetIndicator corresponding to the selected SLSSID;

3> select the subframe(s) indicated by syncOffsetIndicator;

1> else if triggered by V2X sidelink communication and the UE has GNSS as the synchronization reference:

2> select SLSSID 0;

2> if syncOffsetIndicator3 is configured for the frequency used for V2X sidelink communication in SL-V2X-Preconfiguration:

3> select the subframe indicated by syncOffsetIndicator3;

2> else:

3> select the subframe indicated by syncOffsetIndicator1;

1> else:

2> select the synchronisation reference UE (i.e. SyncRef UE) as defined in 5.10.8;

2> if the UE has a selected SyncRef UE and inCoverage in the MasterInformationBlock-SL or MasterInformationBlock-SL-V2X message received from this UE is set to TRUE; or

2> if the UE has a selected SyncRef UE and inCoverage in the MasterInformationBlock-SL or MasterInformationBlock-SL-V2X message received from this UE is set to FALSE while the SLSS from this UE is part of the set defined for out of coverage, see TS 36.211 [21]:

3> select the same SLSSID as the SLSSID of the selected SyncRef UE;

3> select the subframe in which to transmit the SLSS according to the syncOffsetIndicator1 or syncOffsetIndicator2 included in the preconfigured sidelink parameters (i.e. preconfigSync in SL-Preconfiguration or v2x-CommPreconfigSync in SL-V2X-Preconfiguration defined in 9.3) corresponding to the concerned frequency, such that the subframe timing is different from the SLSS of the selected SyncRef UE;

2> else if the UE has a selected SyncRef UE and the SLSS from this UE was transmitted on the subframe indicated by syncOffsetIndicator3 that is included in the syncOffsetIndicators in SL-V2X-Preconfiguration, and is corresponding to the frequency used for V2X sidelink communication:

3> select SLSSID 169;

3> select the subframe indicated by syncOffsetIndicator2;

2> else if the UE has a selected SyncRef UE:

3> select the SLSSID from the set defined for out of coverage having an index that is 168 more than the index of the SLSSID of the selected SyncRef UE, see TS 36.211 [21];

3> select the subframe in which to transmit the SLSS according to syncOffsetIndicator1 or syncOffsetIndicator2 included in the preconfigured sidelink parameters (i.e. preconfigSync in SL-Preconfiguration or v2x-CommPreconfigSync in SL-V2X-Preconfiguration defined in 9.3), such that the subframe timing is different from the SLSS of the selected SyncRef UE;

2> else (i.e. no SyncRef UE selected):

3> if triggered by V2X sidelink communication, randomly select, using a uniform distribution, an SLSSID from the set of sequences defined for out of coverage except SLSSID 168 and 169, see TS 36.211 [21];

3> else, randomly select, using a uniform distribution, an SLSSID from the set of sequences defined for out of coverage, see TS 36.211 [21];

3> select the subframe in which to transmit the SLSS according to the syncOffsetIndicator1 or syncOffsetIndicator2 (arbitrary selection between these) included in the preconfigured sidelink parameters (i.e. preconfigSync in SL-Preconfiguration or v2x-CommPreconfigSync in SL-V2X-Preconfiguration defined in 9.3);

[TS 36.331, clause 5.10.7.4]

The UE shall set the contents of the MasterInformationBlock-SL or MasterInformationBlock-SL-V2X message as follows:

1> if in coverage on the frequency used for the sidelink operation that triggered this procedure as defined in TS 36.304 [4, 11.4]:

2> set inCoverage to TRUE;

2> set sl-Bandwidth to the value of ul-Bandwidth as included in the received SystemInformationBlockType2 of the cell chosen for the concerned sidelink operation;

2> if tdd-Config is included in the received SystemInformationBlockType1:

3> set subframeAssignmentSL to the value representing the same meaning as of subframeAssignment that is included in tdd-Config in the received SystemInformationBlockType1;

2> else:

3> set subframeAssignmentSL to none;

2> if triggered by sidelink communication; and if syncInfoReserved is included in an entry of commSyncConfig from the received SystemInformationBlockType18:

3> set reserved to the value of syncInfoReserved in the received SystemInformationBlockType18;

2> if triggered by sidelink discovery; and if syncInfoReserved is included in an entry of discSyncConfig from the received SystemInformationBlockType19:

3> set reserved to the value of syncInfoReserved in the received SystemInformationBlockType19;

2> if triggered by V2X sidelink communication; and if syncInfoReserved is included in an entry of v2x-SyncConfig from the received SystemInformationBlockType21:

3> set reserved to the value of syncInfoReserved in the received SystemInformationBlockType21;

2> else:

3> set all bits in reserved to 0;

1> else if out of coverage on the frequency used for V2X sidelink communication as defined in TS 36.304 [4, 11.4]; and the concerned frequency is included in v2x-InterFreqInfoList in RRCConnectionReconfiguration or in v2x-InterFreqInfoList within SystemInformationBlockType21 of the serving cell/ PCell:

2> set inCoverage to TRUE;

2> set sl-Bandwidth to the value of the corresponding field included in v2x-InterFreqInfoList;

2> set subframeAssignmentSL and reserved to the value of the corresponding field included in the preconfigured sidelink parameters (i.e. v2x-CommPreconfigGeneral in SL-V2X-Preconfiguration defined in 9.3);

1> else if out of coverage on the frequency used for V2X sidelink communication as defined in TS 36.304 [4, 11.4]; and the UE selects GNSS timing as the synchronization reference source and syncOffsetIndicator3 is not included in SL-V2X-Preconfiguration:

2> set inCoverage to TRUE;

2> set sl-Bandwidth, subframeAssignmentSL and reserved to the value of the corresponding field included in the preconfigured sidelink parameters (i.e. v2x-CommPreconfigGeneral in SL-V2X-Preconfiguration defined in 9.3);

1> else if the UE has a selected SyncRef UE (as defined in 5.10.8):

2> set inCoverage to FALSE;

2> set sl-Bandwidth, subframeAssignmentSL and reserved to the value of the corresponding field included in the received MasterInformationBlock-SL or MasterInformationBlock-SL-V2X;

1> else:

2> set inCoverage to FALSE;

2> set sl-Bandwidth, subframeAssignmentSL and reserved to the value of the corresponding field included in the preconfigured sidelink parameters (i.e. preconfigGeneral in SL-Preconfiguration or v2x-CommPreconfigGeneral in SL-V2X-Preconfiguration defined in 9.3);

1> set directFrameNumber and directSubframeNumber according to the subframe used to transmit the SLSS, as specified in 5.10.7.3;

1> submit the MasterInformationBlock-SL or MasterInformationBlock-SL-V2X message to lower layers for transmission upon which the procedure ends;

[TS 36.331, clause 5.10.8.2]

The UE shall:

1> if triggered by V2X sidelink communication, and in coverage on the frequency for V2X sidelink communication; or

1> if triggered by V2X sidelink communication, and out of coverage on the frequency for V2X sidelink communication, and the frequency used to transmit V2X sidelink communication is included in v2x-InterFreqInfoList in RRCConnectionReconfiguration or in v2x-InterFreqInfoList within SystemInformationBlockType21 of the serving cell/ PCell:

2> if typeTxSync is configured for the concerned frequency and set to enb:

3> select a cell as the synchronization reference source as defined in 5.10.13.3;

2> else if typeTxSync for the concerned frequency is not configured or is set to gnss, and GNSS is reliable in accordance with TS 36.101 [42] and TS 36.133 [16]:

3> select GNSS as the synchronization reference source;

2> else (i.e., there is no GNSS which is reliable in accordance with TS 36.101 [42] and TS 36.133 [16]):

3> search SLSSID=0 on the concerned frequency to detect candidate SLSS, in accordance with TS 36.133 [16];

3> when evaluating the detected SLSS, apply layer 3 filtering as specified in 5.5.3.2 using the preconfigured filterCoefficient as defined in 9.3, before using the S-RSRP measurement results;

3> if the S-RSRP of the SyncRef UE identified by the detected SLSS exceeds the minimum requirement defined in TS 36.133 [16]:

4> select the SyncRef UE;

3> else (i.e., no SLSSID=0 detected):

4> select a cell as the synchronization reference source as defined in 5.10.13.3;

24.1.14.3 Test description

24.1.14.3.1 Pre-test conditions

System Simulator:

SS-NW

– Cell 1

– System information combination 29 as defined in TS 36.508 [18] clause 4.4.3.1 is used in E-UTRA Cell 1.

– 1 GNSS simulator

SS-UE

– SS-UE1: as defined in TS 36.508 [18], configured for and operating as V2X sidelink Communication transmitting and receiving device (as defined in TS 36.508 [18] clause 6.2.3.5), as well as, transmitting Synchronisation information on the resources which the UE is expected to use for transmission and reception.

UE:

– V2X sidelink related configuration

– The UE is authorised to perform V2X Sidelink Communication

– The UE is equipped with below information in UE or in a USIM containing default values (as per TS 36.508 [18]).

Table 24.1.14.3.1-1: UE/ USIM configuration

USIM field

Priority

Value

Access Technology Identifier

EFUST

Service n°119 (V2X) supported

EFVST

As per TS 36.508 [18] clause 4.9.3.4

EFV2X_CONFIG

SL-V2X-Preconfiguration field as defined in Table 24.1.14.3.3-5

Geographical area field as defined in TS 36.508 [18] clause 4.9.3.1.

Preamble:

– The UE is registered, Idle Mode, UE Test Mode E Activated (state 2A) according to TS 36.508 [18] on Cell 1.

24.1.14.3.2 Test procedure sequence

Table 24.1.14.3.2-1 and Table 24.1.14.3.2-2 illustrate the downlink power levels and other changing parameters to be applied for the cell and SS-UE (resp.) at various time instants of the test execution. Row marked "T0" denotes the initial conditions after preamble, while columns marked "T1" … "Tn" are to be applied subsequently. The exact instants on which these values shall be applied are described elsewhere in the present clause.

Table 24.1.14.3.2-1: Time instances of cell power level and parameter changes

Parameter

Unit

Cell 1

T0

Cell-specific RS EPRE

dBm/15kHz

-88

T1

Cell-specific RS EPRE

dBm/15kHz

-79

T2

Cell-specific RS EPRE

dBm/15kHz

-88

Table 24.1.14.3.2-2: Time instances of simulated SS-UE power level and parameter changes

Parameter

Unit

SS-UE1

T0

Cell-specific RS EPRE

dBm/15kHz

"Off"

T1

Cell-specific RS EPRE

dBm/15kHz

-79

T2

Cell-specific RS EPRE

dBm/15kHz

"Off"

Table 24.1.14.3.2-3: Main behaviour

St

Procedure

Message Sequence

TP

Verdict

U – S

Message

00

Trigger the UE to reset UTC time.

NOTE: The UTC time reset may be performed by MMI or AT command (+CUTCR).

0

SS configures:

GNSS simulator is configured for Scenario #1: Scenario #1: static in Geographical area #1, and starts step 1 to simulate a location in the centre of Geographical area #1 as defined in TS 36.508 [18] Table 4.11.2-2. Geographical area #1 is also pre-configured in the UE.

1

The SS configures:

SS-NW sets cell 1 parameters according to the row "T0" in table 24.1.14.3.2-1 in order to match SLSS transmission condition.

2

The SS transmits a Paging message including a systemInfoModification for cell1.

<–

Paging

3

From the beginning of the next modification period the SS transmits SystemInformationBlockType21 according to Table 24.1.14.3.3-1.

<–

SystemInformationBlockType21

4

Wait for 1.1 modification periods for the UE to receive SystemInformationBlockType21 message.

4A

Steps 1 – 10a7 from the generic test procedure for Generic Radio Bearer Establishment (State 3) defined in TS 36.508 [18] clause 4.5.3 take place.

5

Close UE Test Loop with bit E0 in UE test loop mode E LB setup IE set to one (transmission mode).

<–

CLOSE UE TEST LOOP

6

The UE responds with CLOSE UE TEST LOOP COMPLETE.

–>

CLOSE UE TEST LOOP COMPLETE

7

UE transmits a SidelinkUEInformation message requesting resources for transmission of V2X sidelink communication in RRC_CONNECTED

–>

SidelinkUEInformation

8

SS-NW transmits an RRCConnectionReconfiguration message assigning V2X sidelink communication transmission resources for RRC_CONNECTED with condition SETUP and UE-SELECTED.

<–

RRCConnectionReconfiguration

9

The UE submits RRCConnectionReconfigurationComplete message to confirm acceptance of the new configuration.

–>

RRCConnectionReconfigurationComplete

EXCEPTION: Steps 10 – 11 is repeated 3 times.

10

Check: Does the UE transmit SLSS?

UE shall: select Cell1 as synchronization reference

– select the one of the SLSSIDs configured by eNB randomly;

– select the corresponding subframe in which to transmit the SLSS according to the syncOffsetIndicator included in SystemInformationBlockType21.

NOTE: Although the UE is expected to transmit continuously, only the STCH PDCP SDU packets which need to be checked are shown explicitly in the step sequence.

–>

SLSS

1

P

11

Check: Does the UE transmit MasterInformationBlock-SL-V2X message in the same subframe as the SLSS in step 10?

–>

MasterInformationBlock-SL-V2X

1

P

12

The SS transmits a Paging message including a systemInfoModification for cell1.

<–

Paging

13

From the beginning of the next modification period the SS transmits SystemInformationBlockType21 according to Table 24.1.14.3.3-2.

<–

SystemInformationBlockType21

14

Wait for 1.1 modification periods for the UE to receive SystemInformationBlockType21 message and perform RSRP measurement.

EXCEPTION: Steps 15 – 16 is repeated 3 times.

15

Check: Does the UE transmit SLSS?

UE shall select GNSS as synchronization reference:

– select the SLSSID = 0;

– select the subframe in which to transmit the SLSS according to the syncOffsetIndicator included in SystemInformationBlockType21 randomly.

–>

SLSS

1

P

16

Check: Does the UE transmit MasterInformationBlock-SL-V2X message in the same subframe as the SLSS in step 15?

–>

MasterInformationBlock-SL-V2X

1

P

17

The SS configures:

SS-NW sets cell 1 parameters according to the row "T1" in table 24.1.14.3.2-1 in order to mismatch SLSS transmission condition.

18

Void

19

Check: Does the UE transmit SLSS and MasterInformationBlock-SL-V2X message?

–>

SLSS

MasterInformationBlock-SL-V2X

1

F

20

The SS transmits an RRCConnectionReconfiguration message according to Table 24.1.14.3.3-3.

<–

RRCConnectionReconfiguration

21

The UE transmits an RRCConnectionReconfigurationComplete message.

–>

RRCConnectionReconfigurationComplete

EXCEPTION: Steps 22 – 23 is repeated 3 times.

22

Check: Does the UE transmit SLSS?

UE shall select GNSS as synchronization reference:

– select the SLSSID = 0;

– select the subframe in which to transmit the SLSS according to the syncOffsetIndicator included in SystemInformationBlockType21 randomly.

–>

SLSS

2

P

23

Check: Does the UE transmit MasterInformationBlock-SL-V2X message in the same subframe as the SLSS in step 22?

–>

MasterInformationBlock-SL-V2X

2

P

24

SS-NW stops transmitting GNSS RF signals but the GNSS simulation of Scenario #1 continues to run in the GNSS simulator

25

Void

EXCEPTION: Steps 26 – 27 is repeated 3 times.

26

Check: Does the UE transmit SLSS?

UE shall select Cell1 as synchronization reference:

– select one of the SLSSIDs as the SLSSID configured by eNB;

– select the corresponding subframe in which to transmit the SLSS according to the syncOffsetIndicator included in SystemInformationBlockType21.

–>

SLSS

2

P

27

Check: Does the UE transmit MasterInformationBlock-SL-V2X message in the same subframe as the SLSS in step 26?

–>

MasterInformationBlock-SL-V2X

2

P

28

The SS-NW releases the connection.

<–

RRCConnectionRelease

29

Check: Does the UE transmit SLSS and MasterInformationBlock-SL-V2X message?

–>

SLSS

MasterInformationBlock-SL-V2X

3

F

30

The SS configures:

SS-NW sets cell 1 parameters according to the row "T2" in table 24.1.14.3.2-1 in order to match SLSS transmission condition.

SS-NW starts transmitting GNSS RF signals from the continuing simulation of Scenario #1.

31

Void

EXCEPTION: Steps 32 – 33 is repeated 3 times.

32

Check: Does the UE transmit SLSS?

UE shall select GNSS as synchronization reference:

– select the SLSSID = 0;

– select the subframe in which to transmit the SLSS according to the syncOffsetIndicator included in SystemInformationBlockType21 randomly.

–>

SLSS

3

P

33

Check: Does the UE transmit MasterInformationBlock-SL-V2X message in the same subframe as the SLSS in step 32?

–>

MasterInformationBlock-SL-V2X

3

P

33A

SS-NW stops transmitting GNSS RF signals

34

SS configures:

SS-UE1 in accordance with " T1" defined in Table 24.1.14.3.2-2.

SS-UE1 continuously transmits SLSS and MasterInformationBlock-SL-V2X message in the same subframe as the SLSS. SLSS-ID is set to 0, syncOffsetIndicator is set to syncOffsetIndicator included in the first entry of v2x-SyncConfig corresponding to the concerned frequency in v2x-InterFreqInfoList included in SystemInformationBlockType21

<–

SLSS

MasterInformationBlock-SL-V2X

35

Void

36

Void

EXCEPTION: Steps 37 – 38 is repeated 3 times.

37

Check: Does the UE transmit SLSS?

UE shall synchronise to SS-UE1 and:

– select the SLSSID = 0;

– select the subframe in which to transmit the SLSS according to the syncOffsetIndicator included in the second entry of v2x-SyncConfig corresponding to the concerned frequency in v2x-InterFreqInfoList included in SystemInformationBlockType21 such that the subframe timing is different from the SLSS of the selected SyncRef UE.

–>

SLSS

4

P

38

Check: Does the UE transmit MasterInformationBlock-SL-V2X message in the same subframe as the SLSS in step 37?

–>

MasterInformationBlock-SL-V2X

4

P

39

SS configures:

SS-UE1 in accordance with " T2" defined in Table 24.1.14.3.2-2.

40

Void

EXCEPTION: Steps 41-42 are repeated 3 times.

41

Check: Does the UE transmit SLSS?

UE shall select Cell1 as synchronization reference:

– select one of the SLSSIDs configured by eNB;

– select the corresponding subframe in which to transmit the SLSS according to the syncOffsetIndicator included in SystemInformationBlockType21.

–>

SLSS

3,5

P

42

Check: Does the UE transmit MasterInformationBlock-SL-V2X message in the same subframe as the SLSS in step 41?

–>

MasterInformationBlock-SL-V2X

3,5

P

42A

Generic procedure for Generic Radio Bearer Establishment (State 3) defined in TS 36.508 [18] clause 4.5.3 takes place

43

The SS transmits an OPEN UE TEST LOOP message to exit the UE test loop mode.

<–

OPEN UE TEST LOOP

44

The UE transmits an OPEN UE TEST LOOP COMPLETE message.

–>

OPEN UE TEST LOOP COMPLETE

45

The SS transmits a DEACTIVATE TEST MODE message to de-activate UE radio bearer test mode procedure.

<–

DEACTIVATE TEST MODE

46

The UE transmits a DEACTIVATE TEST MODE COMPLETE message.

–>

DEACTIVATE TEST MODE COMPLETE

24.1.14.3.3 Specific message contents

Table 24.1.14.3.3-1: SystemInformationBlockType21 for Cell 1(step 3, Table 24.1.14.3.2-3)

Derivation Path: 36.508 [18], table 4.4.3.3-19

Information Element

Value/remark

Comment

Condition

SystemInformationBlockType21-r14 ::= SEQUENCE {

sl-V2X-ConfigCommon-r14 SEQUENCE {

v2x-InterFreqInfoList-r14 SEQUENCE (SIZE (1..maxFreq)) OF SL-InterFreqInfoV2X-r14 {

SIB

SL-InterFreqInfoV2X-r14[1] SEQUENCE {

v2x-UE-ConfigList-r14 SEQUENCE (SIZE (1.. maxCellIntra)) OF SL-V2X-InterFreqUE-Config-r14 {

SL-V2X-InterFreqUE-Config-r14[1] SEQUENCE {

v2x-SyncConfig-r14 SEQUENCE (SIZE (1..maxSL-V2X-SyncConfig-r14)) OF SL-SyncConfigNFreq-r13 {

SL-SyncConfigNFreq-r13[1] SEQUENCE {

asyncParameters-r13 SEQUENCE {

syncCP-Len-r13

normal

syncOffsetIndicator-r13

1

slssid-r13

30

}

txParameters-r13 SEQUENCE {

syncTxParameters-r13 SEQUENCE {

alpha-r12

al0

p0-r12

31

}

syncTxThreshIC-r13

7

-85dBm

The threshold for starting transmission of SLSS

syncInfoReserved-r13

Not present

syncTxPeriodic-r13

Not present

}

rxParameters-r13

Not present

syncOffsetIndicator-v1430

Not present

gnss-Sync-r14

Not present

}

SL-SyncConfigNFreq-r13[2] SEQUENCE {

asyncParameters-r13 SEQUENCE {

syncCP-Len-r13

normal

syncOffsetIndicator-r13

2

slssid-r13

50

}

txParameters-r13 SEQUENCE {

syncTxParameters-r13 SEQUENCE {

alpha-r12

al0

p0-r12

31

}

syncTxThreshIC-r13

7

-85dBm

The threshold for starting transmission of SLSS

syncInfoReserved-r13

Not present

syncTxPeriodic-r13

Not present

}

rxParameters-r13

Not present

syncOffsetIndicator-v1430

Not present

gnss-Sync-r14

Not present

}

}

}

}

}

}

}

}

Table 24.1.14.3.3-2: SystemInformationBlockType21 for Cell 1(step 13, Table 24.1.14.3.2-3)

Derivation Path: 36.508 [18], table 4.4.3.3-19

Information Element

Value/remark

Comment

Condition

SystemInformationBlockType21-r14 ::= SEQUENCE {

sl-V2X-ConfigCommon-r14 SEQUENCE {

v2x-InterFreqInfoList-r14 SEQUENCE (SIZE (1..maxFreq)) OF SL-InterFreqInfoV2X-r14 {

SIB

SL-InterFreqInfoV2X-r14[1] SEQUENCE {

v2x-UE-ConfigList-r14 SEQUENCE (SIZE (1.. maxCellIntra)) OF SL-V2X-InterFreqUE-Config-r14 {

SL-V2X-InterFreqUE-Config-r14[1] SEQUENCE {

v2x-SyncConfig-r14 SEQUENCE (SIZE (1..maxSL-V2X-SyncConfig-r14)) OF SL-SyncConfigNFreq-r13 {

SL-SyncConfigNFreq-r13[1] SEQUENCE {

asyncParameters-r13 SEQUENCE {

syncCP-Len-r13

normal

syncOffsetIndicator-r13

1

slssid-r13

30

}

txParameters-r13 SEQUENCE {

syncTxParameters-r13 SEQUENCE {

alpha-r12

al0

p0-r12

31

}

syncTxThreshIC-r13

7

-85dBm

The threshold for starting transmission of SLSS

syncInfoReserved-r13

Not present

syncTxPeriodic-r13

Not present

}

rxParameters-r13

Not present

syncOffsetIndicator-v1430

Not present

gnss-Sync-r14

Not present

}

SL-SyncConfigNFreq-r13[2] SEQUENCE {

asyncParameters-r13 SEQUENCE {

syncCP-Len-r13

normal

syncOffsetIndicator-r13

2

slssid-r13

50

}

txParameters-r13 SEQUENCE {

syncTxParameters-r13 SEQUENCE {

alpha-r12

al0

p0-r12

31

}

syncTxThreshIC-r13

7

-85dBm

The threshold for starting transmission of SLSS

syncInfoReserved-r13

Not present

syncTxPeriodic-r13

Not present

}

rxParameters-r13

Not present

syncOffsetIndicator-v1430

Not present

gnss-Sync-r14

Not present

}

}

}

}

}

}

typeTxSync-r14

gnss

ENUMERATED {gnss, enb, ue, spare1}

}

}

Table 24.1.14.3.3-3: RRCConnectionReconfiguration (step 20, Table 24.1.14.3.2-3)

Derivation Path: 36.508 [18], table 4.6.1-8B

Information Element

Value/remark

Comment

Condition

RRCConnectionReconfiguration ::= SEQUENCE {

criticalExtensions CHOICE {

c1 CHOICE {

rrcConnectionReconfiguration-r8 SEQUENCE {

nonCriticalExtension SEQUENCE {

nonCriticalExtension SEQUENCE {

nonCriticalExtension SEQUENCE {

nonCriticalExtension SEQUENCE {

nonCriticalExtension SEQUENCE {

sl-SyncTxControl-r12 SEQUENCE {

networkControlledSyncTx-r12

on

This field indicates whether the UE shall transmit synchronisation information (i.e. become synchronisation source). Value On indicates the UE to transmit synchronisation information while value Off indicates the UE to not transmit such information.

}

}

}

}

}

}

}

}

}

}

Table 24.1.14.3.3-4: SidelinkUEInformation (step 7, Table 24.1.14.3.2-3)

Derivation Path: 36.508 [18], table 4.6.1-21B

Information Element

Value/remark

Comment

Condition

SidelinkUEInformation-r12 ::= SEQUENCE {

criticalExtensions CHOICE {

c1 CHOICE {

sidelinkUEInformation-r12 SEQUENCE {

nonCriticalExtension SEQUENCE {

nonCriticalExtension SEQUENCE {

v2x-CommRxInterestedFreqList-r14 SEQUENCE (SIZE (1..maxFreqV2X-r14)) OF INTEGER (1..maxFreq)

Not present

v2x-CommTxResourceReq-r14 SEQUENCE {

v2x-CommTxFreqList-r14 SEQUENCE (SIZE (1..maxFreqV2X-r14)) OF { INTEGER (1..maxFreq) }

[f5 in TS 36.508 [18] clause 6.2.3.5]

Configured in SIB21

v2x-TypeTxSyncList-r14 SEQUENCE (SIZE (1..maxFreqV2X-r14)) OF SEQUENCE {

SL-TypeTxSync-r14

Not checked

}

v2x-DestinationInfoList-r14 SEQUENCE (SIZE (1..maxSL-Dest-r12)) OF SEQUENCE {

SL-DestinationIdentity-r12

Not checked

}

}

}

}

}

}

}

}

Table 24.1.14.3.3-5: SL-V2X-Preconfiguration

Derivation Path: 36.508 [18], table 6.8.2.1-1

Information Element

Value/remark

Comment

Condition

SL-V2X-Preconfiguration-r14 ::= SEQUENCE {

anchorCarrierFreqList-r14 SEQUENCE (SIZE (1..maxFreq)) OF SEQUENCE {

1 entries

ARFCN-ValueEUTRA-r9[1]

f1 in TS 36.508 [18] clause 6.2.3.1

}

}