U – S

Message

1

Make the UE attempt an IMS speech call.

–

–

–

–

2

Check: Does the UE transmit an RRCSetupRequest message with ‘establishmentCause’ set to ‘mo-VoiceCall’?

–>

NR RRC: RRCSetupRequest

–

P

3

SS transmit an RRCSetup message.

<–

NR RRC: RRCSetup

–

–

4

Check: Does the UE transmit an RRCSetupComplete message to confirm the successful completion of the connection establishment and to initiate the session management procedure by including the SERVICE REQUEST message?

–>

NR RRC: RRCSetupComplete
5GMM: SERVICE REQUEST

–

P

5

The SS transmits a SecurityModeCommand message to activate AS security.

<–

NR RRC: SecurityModeCommand

–

–

6

Check: Does the UE transmit a SecurityModeComplete message and establish the initial security configuration?

–>

NR RRC: SecurityModeComplete

–

P

7

The SS transmits an RRCReconfiguration message and a SERVICE ACCEPT message to establish SRB2 and DRB(s).

<–

NR RRC: RRCReconfiguration
5GMM: SERVICE ACCEPT

–

–

–

EXCEPTION: In parallel to step 8 below, the steps specified in Table 4.9.15.2.2-2 take place.

–

–

–

–

8

The UE transmits an RRCReconfigurationComplete message.

–>

NR RRC: RRCReconfigurationComplete

–

–

–

EXCEPTION: Steps 9a1 to 9b4 describe behaviour that depends on UE configuration; the “lower case letter” identifies a step sequence that takes place if such configuration was conducted.

–

–

–

–

9a1-9a4

IF the UE is configured to use preconditions THEN steps 2-5 of Annex A.4.1 of TS 34.229-5 [47] take place.

–

–

–

–

9b1-9b4

ELSE steps 2-5 of Annex A.4.2 of TS 34.229-5 [47] take place.

–

–

–

–

10

The SS transmits an RRCReconfiguration message and a PDU SESSION MODIFICATION COMMAND message.

<–

NR RRC: RRCReconfiguration
5GMM: DL NAS TRANSPORT
5GSM: PDU SESSION MODIFICATION COMMAND

–

–

–

EXCEPTION: In parallel to steps 11 and 12 below, step 13a1 or 13b1 occur.

–

–

–

–

11

The UE transmits an RRCReconfigurationComplete message.

–>

NR RRC: RRCReconfigurationComplete

–

–

12

Check: Does the UE transmit an ULInformationTransfer message, an UL NAS TRANSPORT message and a PDU SESSION MODIFICATION COMPLETE message?

–>

NR RRC: ULInformationTransfer

5GMM: UL NAS TRANSPORT

5GSM: PDU SESSION MODIFICATION COMPLETE

–

P

–

EXCEPTION: Steps 13a1 to 13b3 describe behaviour that depends on UE configuration; the “lower case letter” identifies a step sequence that takes place if such configuration was conducted.

–

–

–

–

13a1-13a7

IF the UE is configured to use preconditions THEN steps 6-12 of Annex A.4.1 of TS 34.229-5 [47] take place.

–

–

–

–

13b1-13b3

ELSE steps 6-8 of Annex A.4.2 of TS 34.229-5 [47] take place.

–

–

–

–

U – S

Message

–

EXCEPTION: Steps 1a1 to 1b1 describe behaviour that depends on UE configuration; the “lower case letter” identifies a step sequence that takes place if such configuration was conducted.

–

–

–

–

1a1

IF the UE is configured to use preconditions THEN step 1 of Annex A.4.1 of TS 34.229-5 [47] takes place.

–

–

–

–

1b1

ELSE step 1 of Annex A.4.2 of TS 34.229-5 [47] takes place.

–

–

–

–

Information Element

Value/remark

Comment

Condition

RRCSetupRequest ::= SEQUENCE {

rrcSetupRequest SEQUENCE {

establishmentCause

mo-VoiceCall

}

}

Information Element

Value/remark

Comment

Condition

Service type

Service type value

‘0001’B

data

Information Element

Value/remark

Comment

Condition

PDU session ID

Same value as sent in PDU SESSION ESTABLISHMENT REQUEST message.

Authorized QoS rules

Reference QoS rule #7 as defined in Table 4.8.2.1-7 using condition IMS_VOICE.

Authorized QoS flow descriptions

Reference QoS flow #5 as defined in Table 4.8.2.3-5.