13.1.19 Emergency call setup from E-UTRAN RRC_IDLE / IMS VoPS supported / EMC BS not supported / CS fallback to UTRAN or GERAN with redirection

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

13.1.19.1 Test Purpose (TP)

(1)

with { UE is in E-UTRA RRC_IDLE state having received ATTACH ACCEPT set to IMS Voice over PS supported and Emergency bearer services indicator not supported }

ensure that {
when { the user initiates an emergency call }

then { UE transmits an RRCConnectionRequest message with establishmentCause set to "emergency" and an EXTENDED SERVICE REQUEST message with Service type IE set to "mobile originating CS fallback emergency call or 1xCS fallback emergency call" and attempts a CS emergency call on UTRAN or GERAN cell }

}

13.1.19.2 Conformance requirements

References: The conformance requirements covered in the present TC are specified in: TS 23.272 clause 4.6, TS 24.301 clause 5.6.1.1 and TS 23.167 Annex H. Unless otherwise stated these are Rel-9 requirements.

[TS 23.272, clause 4.6]

When UE is performing CS fallback procedure for Mobile Originating Call for the purpose of emergency call, it shall indicate to the MME that this CS fallback request is for emergency purpose. MME also indicates to the E-UTRAN via the appropriate S1-AP message that this CS fallback procedure is for emergency purpose. If PS handover is initiated, E‑UTRAN may indicate priority level of the CS fallback to the target RAT, as specified in TS 25.413 [29], in order to prepare radio resource at target RAT in appropriate way, e.g. priority allocation of the RAB resource.

NOTE 1: E-UTRAN may use the emergency indication for selecting a particular radio access network (2G or 3G) for CS emergency handling.

[TS 24.301, clause 5.6.1.1]

The UE shall invoke the service request procedure when:

d) the UE in EMM-IDLE or EMM-CONNECTED mode is configured to use CS fallback and has a mobile originating CS fallback request from the upper layer;

[TS 23.167, Annex H]

This clause details the domain priority and selection (see clause 7.3) for UE that attempts to make an emergency session for UTRAN and E-UTRAN radio access networks based on the UE attach status to CS or PS domains and the network support for IMS emergency and IMS voice over PS.

The following table (Table H.1) defines these rules based on the UE (last 2 columns) for different initial conditions (first 4 columns) when an emergency session is initiated and when the UE is not in limited service state.

Table H.1: Domain Selection Rules for emergency session attempts for UTRAN and E-UTRAN radio access networks

CS Attached

PS Attached

VoIMS

EMS

First EMC Attempt

Second EMC Attempt

A

N

Y

Y

Y

PS

CS if available and supported

B

N

Y

N

Y

PS or CS if the emergency session includes at least voice.

PS if the emergency session contains only media other than voice.

PS if first attempt in CS

CS if first attempt in PS

C

N

Y

Y or N

N

CS if available and supported and if the emergency session includes at least voice.

No attempt is made in the PS domain

D

Y

N

Y or N

Y or N

CS if the emergency session includes at least voice.

PS if available and EMS is "Y" and emergency session contains only media other than voice.

PS if available and EMS is "Y"

E

Y

Y

Y

Y

If the emergency session includes at least voice, follow rules in TS 22.101 [8] which say to use the same domain as for a non-EMC

PS if the emergency session contains only media other than voice.

PS if first attempt in CS

CS if first attempt in PS

F

Y

Y

Y or N

N

CS if the emergency session includes at least voice.

No attempt is made in the PS domain

G

Y

Y

N

Y

CS if the emergency session includes at least voice.

PS if the emergency session contains only media other than voice.

PS

EMC = Emergency Session. EMC includes also normal calls initiated in the CS domain that are treated by the CS CN as emergency calls.

VoIMS = Voice over IMS over PS sessions support as indicated by IMS Voice over PS session supported indication as defined in TS 23.401 [28] and TS 23.060 [2].

EMS = IMS Emergency Services supported as indicated by Emergency Service Support indicator as defined in TS 23.401 [28] and TS 23.060 [2].

NOTE: If the UE selects the CS domain and initiates a normal call using the dialled local emergency number (see clause 7.1.2), and the UE enters limited service state (e.g. due to a Location Registration failing), then the UE camps on an acceptable cell (see TS 23.122 [41]) and may proceed with the EMC by initiating an emergency call in limited service state.

13.1.19.3 Test description

13.1.19.3.1 Pre-test conditions

System Simulator:

– Cell 1.

– System information combination 10 as defined in TS 36.508 [18] clause 4.4.3.1 is used in E-UTRA cell.

– If (px_RATComb_Tested = EUTRA_UTRA)

– cell 5 is configured as ”Suitable Neighbour cell”

– If (px_RATComb_Tested = EUTRA_GERAN)

– cell 24 is configured as ”Suitable Neighbour cell”

UE:

None.

Preamble:

– The UE is in state Registered, Idle mode (state 2) on Cell 1 according to [18].

13.1.19.3.2 Test procedure sequence

Table 13.1.19.3.2-0: instances of cell power level and parameter changes

Parameter

Unit

Cell 1

Remark

T1

Cell-specific RS EPRE

dBm/15kHz

-115

The power levels are such that reselection back to cell 1 should not occur

Table 13.1.19.3.2-1: Main behaviour

St

Procedure

Message Sequence

TP

Verdict

U – S

Message

1

Cause the UE to originate emergency call. (see Note 1)

2

Check: Does the UE transmit an RRCConnectionRequest message on Cell 1?

–>

RRCConnectionRequest

1

P

3

The SS transmits an RRCConnectionSetup message on Cell 1.

<–

RRCConnectionSetup

4

Check: Does the UE transmit an RRCConnectionSetupComplete message on Cell 1 including an EXTENDED SERVICE REQUEST message with Service type IE set to "mobile originating CS fallback emergency call or 1xCS fallback emergency call"?

–>

RRCConnectionSetupComplete

1

P

EXCEPTION: Steps 5a1 to 5b15 describe behaviour that depends on the UE capability; the "lower case letter" identifies a step sequence that takes place if a capability is supported.

5a1

IF (px_RATComb_Tested = EUTRA_UTRA), the SS reconfigures:

Cell 1 as a "Suitable cell",

Cell 5 as the "Serving cell".

5a2

The SS transmits an RRCConnectionRelease message indicating redirection to cell 5

<–

RRCConnectionRelease

5a3

Check: Does the UE transmit a RRC CONNECTION REQUEST message on Cell 5 with Establishment cause: Emergency Call?

–>

RRC CONNECTION REQUEST

1

P

5a3A1

The SS changes cell 1 power level according to the row “T1” in table 13.1.19.3.2-0

5a4

The SS transmits an RRC CONNECTION SETUP message.

<–

RRC CONNECTION SETUP

5a5

The UE transmits an RRC CONNECTION SETUP COMPLETE message.

–>

RRC CONNECTION SETUP COMPLETE

EXCEPTION: In parallel to the events described in step 5a6 to 5a17 the step specified in Table 13.1.19.3.2-2 takes place.

5a6

The UE transmits a CM SERVICE REQUEST with CM Service Type indicating ‘Emergency call establishment.

–>

CM SERVICE REQUEST

5a7

The SS transmits AUTHENTICATION REQUEST

<–

AUTHENTICATION REQUEST

5a8

The UE transmits AUTHENTICATION RESPONSE

–>

AUTHENTICATION RESPONSE

5a9

The SS transmits a SECURITY MODE COMMAND message for the CS domain.

<–

SECURITY MODE COMMAND

5a10

The UE transmits a SECURITY MODE COMPLETE message.

–>

SECURITY MODE COMPLETE

5a11

The UE transmits an EMERGENCY SETUP message.

–>

EMERGENCY SETUP

5a12-5a17

Steps 12 to 17 of the test procedure in TS 34.123-1 [7] subclause 13.2.1.1 are performed.

NOTE: Emergency call is established.

5a17A

The SS transmits a SECURITY MODE COMMAND message for the PS domain.

(See Note 2)

<–

SECURITY MODE COMMAND

5a17B

The UE transmits a SECURITY MODE COMPLETE message.

–>

SECURITY MODE COMPLETE

5a18

The SS transmits a ROUTING AREA UPDATE ACCEPT.

<–

ROUTING AREA UPDATE ACCEPT

5a19

The UE sends ROUTING AREA UPDATE COMPLETE.

–>

ROUTING AREA UPDATE COMPLETE

5a20

Wait for 2 seconds to provide enough time to finish up optional IMS deregistration.

5b1

IF (px_RATComb_Tested = EUTRA_GERAN), the SS reconfigures:

Cell 1 as a "Suitable cell",

Cell 24 as the "Serving cell".

5b2

The SS transmits an RRCConnectionRelease message indicating redirection to cell 24

<–

RRCConnectionRelease

5b3

Check: Does the UE transmit a CHANNEL REQUEST message on Cell 24 with Establishment cause: Emergency call?

–>

CHANNEL REQUEST

1

P

5b3A1

The SS changes cell 1 power level according to the row “T1” in table 13.1.19.3.2-0

5b4

The SS transmits an IMMEDIATE ASSIGNMENT message.

<–

IMMEDIATE ASSIGNMENT

5b5

The UE transmit a CM SERVICE REQUEST with CM service type IE indicating “Emergency call establishment”

–>

CM SERVICE REQUEST

5b5A

The UE transmits a Classmark Change message

–>

CLASSMARK CHANGE

EXCEPTION: Step 5b5B describes behaviour that depends on the UE capability.

5b5B

IF pc_UTRA then the UE transmits a Utran Classmark message

–>

UTRAN CLASSMARK CHANGE

5b6

The SS transmits an AUTHENTICATION REQUEST message.

<–

AUTHENTICATION REQUEST

5b7

The UE transmits an AUTHENTICATION RESPONSE message.

–>

AUTHENTICATION RESPONSE

5b7A

The SS transmits a CIPHERING MODE COMMAND message.

<–

CIPHERING MODE COMMAND

5b7B

The UE transmits a CIPHERING MODE COMPLETE message.

–>

CIPHERING MODE COMPLETE

5b8

The UE transmits an EMERGENCY SETUP message.

–>

EMERGENCY SETUP

5b9-5b15

Steps 11 to 17 of the generic test procedure in TS 51.010-1 subclause 10.2.3 are performed on Cell 24.
NOTE: the CS call setup is completed.

5b16

The SS transmits DISCONNECT.

<–

DISCONNECT

5b17

The UE transmits RELEASE..

–>

RELEASE

5b18

The SS transmits RELEASE COMPLETE.

<–

RELEASE COMPLETE

5b19

The SS transmits CHANNEL RELEASE, with GPRS Resumption Field set to 1

<–

CHANNEL RELEASE

5b20-5b30

Steps 1 to 11 of the generic test procedure in sub clause 6.4.2.9 are performed.

At the end of this test procedure sequence, the UE is in end state GERAN idle (G1) according to TS 36.508.

Note 1: The trigger in step 1 is the same as in the generic procedure in 36.508 clause 6.4.3.5.

Note 2: A real network will initiate the security mode command procedure for the PS domain immediately after receiving the ROUTING AREA UPDATE REQUEST, but in this test procedure it was chosen to complete the procedure for CS domain first, in order to avoid the possibility of a security mode command procedure running in parallel with another RRC procedure.

Table 13.1.19.3.2-2: Parallel behaviour

St

Procedure

Message Sequence

TP

Verdict

U – S

Message

1

The UE transmits a ROUTING AREA UPDATE REQUEST message.

–>

ROUTING AREA UPDATE REQUEST

13.1.19.3.3 Specific message contents

Table 13.1.19.3.3-1: ATTACH ACCEPT (Preamble)

Derivation Path: 36.508 Table 4.7.2-1

Information Element

Value/remark

Comment

Condition

EPS network feature support

‘0000 0001’B

IMS voice over PS session in S1 mode supported, emergency bearer services in S1 mode not supported

Table 13.1.19.3.3-2: RRCConnectionRequest (step 2, Table 13.1.19.3.2-1)

Derivation Path: 36.508, Table 4.6.1-16

Information Element

Value/remark

Comment

Condition

RRCConnectionRequest ::= SEQUENCE {

criticalExtensions CHOICE {

rrcConnectionRequest-r8 SEQUENCE {

establishmentCause

emergency

}

}

}

Table 13.1.19.3.3-3: EXTENDED SERVICE REQUEST (step 4, Table 13.1.19.3.2-1)

Derivation Path: TS 36.508, Table 4.7.2-14A

Information Element

Value/remark

Comment

Condition

Service type

‘0010’B

mobile originating CS fallback emergency call or 1xCS fallback emergency call

CSFB response

Not present

Table 13.1.19.3.3-4: RRCConnectionRelease (step 5a2, Table 13.1.19.3.2-1)

Derivation Path: TS 36.508, Table 4.7.2-14A

Information Element

Value/remark

Comment

Condition

RRCConnectionRelease ::= SEQUENCE {

criticalExtensions CHOICE {

c1 CHOICE {

rrcConnectionRelease-r8 SEQUENCE {

redirectedCarrierInfo ::= CHOICE {

Utran

f8

}

}

}

Table 13.1.19.3.3-5: RRCConnectionRelease (step 5b2, Table 13.1.19.3.2-1)

Derivation Path: TS 36.508, Table 4.7.2-14A

Information Element

Value/remark

Comment

Condition

RRCConnectionRelease ::= SEQUENCE {

criticalExtensions CHOICE {

c1 CHOICE {

rrcConnectionRelease-r8 SEQUENCE {

redirectedCarrierInfo ::= CHOICE {

Geran

f11

}

}

}