Tech-invite  3GPPspace  IETFspace
21  22  23  24  25  26  27  28  29  31  32  33  34  35  36  37  38  4‑5x

Content for  TR 23.856  Word version:  10.0.0

Top   Top   None   None   Next
1…   5… 
1 Scope  2 References  3 Definitions and abbreviations  4 Requirements  4.1 General  4.2 Architectural Requirements  4.3 SRVCC Performance Requirements 
...

 

1  Scope  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.
Up

2  References  p. 7

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]
TR 22.278: "Service requirements for the Evolved Packet System (EPS)".
[3]
TS 23.216: " Single Radio Voice Call Continuity (SRVCC); Stage 2".
[4]
TS 23.237: "IP Multimedia Subsystem (IMS) Service Continuity; Stage 2".
[5]
TS 36.133: "Requirements for support of radio resource management.
[6]
TS 23.401: "General Packet Radio Service (GPRS) enhancements for Evolved Universal Terrestrial Radio Access Network (E-UTRAN) access".
[7]
TS 23.292: "IP Multimedia Subsystem (IMS) centralized services".
[8]
TS 23.228: "IP Multimedia Subsystem (IMS); Stage 2".
[9]
TS 36.413: " Evolved Universal Terrestrial Radio Access (E-UTRA) ; S1 Application Protocol (S1AP)".
[10]
TS 23.272: "Circuit Switched Fallback in Evolved Packet System; Stage 2".
[11]
RFC 3264:  "An Offer/Answer Model with the Session Description Protocol (SDP)".
[12]
TS 23.203: "Policy and charging control architecture".
[13]
TS 23.334: "IP Multimedia Subsystem (IMS) Application Level Gateway (IMS-ALG) - IMS Access Gateway (IMS-AGW) interface: Procedures descriptions".
[14]
TS 23.206: "Voice Call Continuity (VCC) between Circuit Switched (CS) and IP Multimedia Subsystem (IMS); Stage 2".
Up

3  Definitions and abbreviations  p. 8

3.1  Definitions  p. 8

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

3.2  Abbreviations  p. 8

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

4  Requirements  p. 8

4.1  General  p. 8

  • 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  p. 8

  • 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  p. 8

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

Up   Top   ToC