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