3 Definitions and abbreviations

23.2163GPPRelease 16Single Radio Voice Call Continuity (SRVCC)Stage 2TS

3.1 Definitions

For the purposes of the present document, the terms and definitions given in TR 21.905 [1] and the following apply. A term defined in the present document takes precedence over the definition of the same term, if any, in TR 21.905 [1].

1xCS: The 3GPP2 legacy circuit switched signalling system as defined in 3GPP2 X.S0042-0 [4].

3GPP SRVCC UE: A 3GPP SRVCC UE is a UE enhanced for IMS Service Continuity with the additional UE capabilities described in this specification for SRVCC NG-RAN to 3GPP UTRAN and / or between E-UTRAN and 3GPP UTRAN and / or between E-UTRAN and 3GPP GERAN and / or between UTRAN (HSPA) and 3GPP UTRAN and 3GPP GERAN.

Correlation MSISDN: An MSISDN used for correlation of sessions. See TS 23.003 [27] for more information.

Emergency Session Transfer Number for SRVCC (E-STN-SR): see TS 23.237 [14].

IMS-based MPS Session: see TS 23.401 [2].

Session Transfer Number for SRVCC (STN-SR): see TS 23.237 [14].

Single Radio Voice Call Continuity (SRVCC): Voice call continuity between IMS over PS access and CS access for calls that are anchored in IMS when the UE is capable of transmitting/receiving on only one of those access networks at a given time.

Single Radio Video Call Continuity (vSRVCC): Video call continuity from E-UTRAN to UTRAN-CS for calls that are anchored in the IMS when the UE is capable of transmitting/receiving on only one of those access networks at a given time. In this specification, the term vSRVCC is introduced for Single Radio Video Call Continuity to differentiate it from Single Radio Voice Call Continuity (SRVCC).

CS to PS Single Radio Voice Call Continuity (CS to PS SRVCC): SRVCC from UTRAN to E-UTRAN, and SRVCC from GERAN to UTRAN/E-UTRAN.

Video Call: For IMS over E-UTRAN, it represents the session using bidirectional voice and synchronised real time video as specified in TS 22.173 [26]. For UTRAN-CS, it represents the Circuit Switched (CS) multimedia calls as specified in TS 22.101 [31].

For the purposes of the present document, the following terms and definitions given in TS 23.401 [2] apply:

eCall Only Mode: See TS 23.401 [2].

For the purposes of the present document, the following terms and definitions given in TS 22.101 [31] apply:

eCall: See TS 22.101 [31].

Minimum Set of Data (MSD): See TS 22.101 [31].

3.2 Abbreviations

For the purposes of the present document, the abbreviations given in TR 21.905 [1] and the following apply. An abbreviation defined in the present document takes precedence over the definition of the same abbreviation, if any, in TR 21.905 [1].

1xCS IWS Single Radio Voice Call Continuity Interworking solution Function for 3GPP2 1xCS

ARP Allocation and Retention Priority

C‑MSISDN Correlation MSISDN

MPS Multimedia Priority Service

MSD Minimum Set of emergency related Data

SAI Service Area Identifier as defined in TS 25.413 [11] and TS 23.003 [27]

SRVCC Single Radio Voice Call Continuity

vSRVCC Single Radio Video Call Continuity

MME_SRVCC MME Supporting 5G-SRVCC