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Content for  TR 23.856  Word version:  10.0.0

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1  ScopeWord‑p. 7

SR-VCC has been standardized in Release 8 TS 23.216 to provide seamless continuity when UE handovers from E-UTRAN to UTRAN/GERAN.
This document contains the results of feasibility study of the requirements and the alternative solutions to improve the handover performance of SRVCC.
The objective of this study is as follows:
  • Evaluating the performance of current Rel 8 SRVCC solution;
  • Enhancing the performance of the SR-VCC Flow Break with regard to the roaming and non-roaming case;
  • Enhancing SR-VCC handover performance while minimizing the impacts on the network architecture for the directions
    • from EUTRAN to UTRAN/GERAN; and
    • from UTRAN to UTRAN/GERAN.

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.
TR 21.905: "Vocabulary for 3GPP Specifications".
TR 22.278: "Service requirements for the Evolved Packet System (EPS)".
TS 23.216: " Single Radio Voice Call Continuity (SRVCC); Stage 2".
TS 23.237: "IP Multimedia Subsystem (IMS) Service Continuity; Stage 2".
TS 36.133: "Requirements for support of radio resource management.
TS 23.401: "General Packet Radio Service (GPRS) enhancements for Evolved Universal Terrestrial Radio Access Network (E-UTRAN) access".
TS 23.292: "IP Multimedia Subsystem (IMS) centralized services".
TS 23.228: "IP Multimedia Subsystem (IMS); Stage 2".
TS 36.413: " Evolved Universal Terrestrial Radio Access (E-UTRA) ; S1 Application Protocol (S1AP)".
TS 23.272: "Circuit Switched Fallback in Evolved Packet System; Stage 2".
RFC 3264:  "An Offer/Answer Model with the Session Description Protocol (SDP)".
TS 23.203: "Policy and charging control architecture".
TS 23.334: "IP Multimedia Subsystem (IMS) Application Level Gateway (IMS-ALG) - IMS Access Gateway (IMS-AGW) interface: Procedures descriptions".
TS 23.206: "Voice Call Continuity (VCC) between Circuit Switched (CS) and IP Multimedia Subsystem (IMS); Stage 2".

3  Definitions and abbreviationsWord‑p. 8

3.1  Definitions

For the purposes of the present document, the terms and definitions given in TR 21.905 apply.

3.2  Abbreviations

For the purposes of the present document, the abbreviations given in TR 21.905 apply.

4  Requirements

4.1  General

  • The impact to the existing SRVCC architecture should be minimized.
  • NO impact on UE.
  • The impact to the EPS should be minimized.
  • The impact to the existing SRVCC procedure should be minimized.

4.2  Architectural Requirements

  • The solution shall keep backward compatibility to the UE of previous releases.
  • The solution shall support Local Breakout scenarios according to TS 23.228, with the possibility of having the P-CSCF either in the visited network or in the home network.
  • The SRVCC enhancement solution shall not negatively affect the SRVCC emergency call procedures.

4.3  SRVCC Performance Requirements

  • The interruption time of SRVCC is not higher than 300ms as required in TS 22.278, from EUTRAN to UTRAN.

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