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Content for  TS 23.216  Word version:  16.4.0

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1  ScopeWord‑p. 7
This document specifies the architecture enhancements for Single Radio Voice Call Continuity (SRVCC) between the following access systems for voice calls that are anchored in the IMS:
  • from E UTRAN to 3GPP2 1xCS;
  • from E UTRAN to UTRAN/GERAN;
  • from UTRAN (HSPA) to UTRAN/GERAN.
  • from UTRAN/GERAN to E-UTRAN.
  • from GERAN to UTRAN (HSPA).
  • from NG-RAN to UTRAN.
This document will not describe 3GPP2 functional entities. However, interfaces between both 3GPP and 3GPP2 functional entities are described in this specification.
SRVCC from E UTRAN access to 3GPP2 1xCS is covered in this specification, including the handling of IMS emergency call continuity. Handling of non voice component and SRVCC from 3GPP2 1xCS to E UTRAN direction is not specified in this release.
SRVCC from NG-RAN/E UTRAN/UTRAN (HSPA) access and 3GPP UTRAN/GERAN CS accesses for voice calls that are anchored in the IMS, as well as the coordination between the SRVCC for voice call and the handover of non voice PS bearers are covered in this specification. SRVCC with IMS emergency call continuity from E-UTRAN/UTRAN (HSPA) to 3GPP UTRAN/GERAN CS accesses and from NG-RAN to UTRAN for voice calls is covered in this specification. SRVCC with eCall over IMS continuity from E-UTRAN/UTRAN (HSPA) to 3GPP UTRAN/GERAN CS accesses is covered in this specification. SRVCC with priority handling from E-UTRAN to 3GPP UTRAN/GERAN CS accesses for voice or voice and video calls is also covered in this specification. The handover of non voice PS bearer from E-UTRAN is specified by the procedures defined in TS 23.401, TS 23.060, TS 25.413 and TS 43.129. The handover of non-voice PS bearer from UTRAN (HSPA) is specified by the procedures defined in TS 23.060, TS 25.413 and TS 43.129. The handover of non-voice PS bearer from NG-RAN to UTRAN is not supported.
This document specifies the architecture enhancements for Single Radio Video Call Continuity (vSRVCC) from E-UTRAN to UTRAN-CS access for Video Calls that are anchored in the IMS.
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2  References

The following documents contain provisions which, through reference in this text, constitute provisions of the present document.
  • References are either specific (identified by date of publication, edition number, version number, etc.) or non specific.
  • For a specific reference, subsequent revisions do not apply.
  • For a non-specific reference, the latest version applies. In the case of a reference to a 3GPP document (including a GSM document), a non-specific reference implicitly refers to the latest version of that document in the same Release as the present document.
[1]
TR 21.905: "Vocabulary for 3GPP Specifications".
[2]
TS 23.401: "GPRS enhancements for E-UTRAN access".
[3]
TS 23.402: "Architecture enhancements for non-3GPP accesses".
[4]
3GPP2 X.S0042-0: "Voice Call Continuity between IMS and Circuit Switched System".
[5]  Void.
[6]  Void.
[7]
TR 36.938: "Improved Network Controlled Mobility between E-UTRAN and 3GPP2/Mobile WiMAX Radio Technologies".
[8]
3GPP2 A.S0008-C: "Interoperability Specification (IOS) for High Rate Packet Data (HRPD) Radio Access Network Interfaces with Session Control in the Access Network".
[9]
TS 22.278: "Service requirements for the Evolved Packet System (EPS)".
[10]
TS 23.060: "General Packet Radio Service (GPRS); Service description; Stage 2".
[11]
TS 25.413: "UTRAN Iu interface Radio Access Network Application Part (RANAP) signalling".
[12]
TS 43.129: "Packet-switched handover for GERAN A/Gb mode; Stage 2".
[13]
TS 23.292: "IP Multimedia Subsystem (IMS) Centralized Services: Stage 2".
[14]
TS 23.237: "IP Multimedia Subsystem (IMS) Service Continuity: Stage 2".
[15]
TS 23.002: "Network Architecture".
[16]
TS 36.300: "Evolved Universal Terrestrial Radio Access (E-UTRA) and Evolved Universal Terrestrial Radio Access Network (E-UTRAN); Overall description; Stage 2".
[17]  Void.
[18]
TS 23.009: "Handover procedures".
[19]
TS 25.331: "Radio Resource Control (RRC) protocol specification".
[20]
3GPP2 A.S0014: "Interoperability Specification (IOS) for cdma2000 Access Network Interfaces".
[21]
TS 33.210: "3G Security; Network Domain Security; IP network layer security".
[22]
TS 33.401: "3GPP System Architecture Evolution (SAE): Security architecture".
[23]
TS 48.008: "Mobile Switching Centre - Base Station System (MSC-BSS) interface; Layer 3 specification".
[24]
TS 48.018: "General Packet Radio Service (GPRS); Base Station System (BSS) - Serving GPRS Support Node (SGSN); BSS GPRS Protocol (BSSGP)".
[25]
TS 33.102: "3G Security; Security architecture".
[26]
TS 22.173: "IP Multimedia Core Network Subsystem (IMS) Multimedia Telephony Service and supplementary services".
[27]
TS 23.003: "Numbering, addressing and identification".
[28]
TS 23.167: "IP Multimedia Core Network Subsystem (IMS) emergency sessions".
[29]
TS 23.271: "Functional stage 2 description of Location Services (LCS)".
[30]
TS 36.413: "Evolved Universal Terrestrial Radio Access Network (E-UTRAN); S1 Application Protocol (S1AP)".
[31]
TS 22.101: "Service aspects; Service principles".
[32]
TS 23.203: "Policy and charging control architecture".
[33]
ITU T Recommendation H.324 Annex K: "Media oriented negotiation acceleration procedure" and associated changes to Annex J".
[34]
TS 26.111: "Codec for circuit switched multimedia telephony service; Modifications to H.324".
[35]
TR 26.911: "Codec(s) for Circuit-Switched (CS) multimedia telephony service; Terminal implementor's guide".
[36]
TS 36.423: "Evolved Universal Terrestrial Radio Access Network (E-UTRAN); X2 Application Protocol (X2AP)".
[37]
TS 29.303: "Domain Name System Procedures; Stage 3".
[38]
TS 22.002: "Circuit Bearer Services (BS) supported by a Public Land Mobile Network (PLMN)".
[39]
TS 22.003: "Circuit Teleservices supported by a Public Land Mobile Network (PLMN)".
[40]
TS 23.251: "Network sharing; Architecture and functional description".
[41]
TS 29.002: "Mobile Application Part (MAP) specification".
[42]
TS 23.272: "Circuit Switched (CS) fallback in Evolved Packet System (EPS)".
[43]
TS 26.267: "eCall data transfer; In-band modem solution; General description".
[44]
TS 24.008: "Mobile radio interface Layer 3 specification; Core network protocols; Stage 3".
[45]
TS 23.502: "Procedures for the 5G System".
[46]
TS 38.423: "Xn application protocol (XnAP)".
[47]
TS 38.413: "NG Application Protocol (NGAP)".
[48]
TS 23.501: "System Architecture for the 5G System; Stage 2".
[49]
TS 38.300: "NR and NG-RAN Overall Description; Stage 2".
[50]
TS 23.273: "5G System (5GS) Location Services (LCS); Stage 2".
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3  Definitions and abbreviationsWord‑p. 9

3.1  Definitions

For the purposes of the present document, the terms and definitions given in TR 21.905 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.
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 for more information.
Emergency Session Transfer Number for SRVCC (E-STN-SR):
see TS 23.237.
IMS-based MPS Session:
see TS 23.401.
Session Transfer Number for SRVCC (STN-SR):
see TS 23.237.
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. For UTRAN-CS, it represents the Circuit Switched (CS) multimedia calls as specified in TS 22.101.
For the purposes of the present document, the following terms and definitions given in TS 23.401 apply:
eCall Only Mode:
See TS 23.401.
For the purposes of the present document, the following terms and definitions given in TS 22.101 apply:
eCall:
See TS 22.101.
Minimum Set of Data (MSD):
See TS 22.101.
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3.2  Abbreviations |R11|Word‑p. 10
For the purposes of the present document, the abbreviations given in TR 21.905 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.
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 and TS 23.003
SRVCC
Single Radio Voice Call Continuity
vSRVCC
Single Radio Video Call Continuity
MME_SRVCC
MME Supporting 5G-SRVCC
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