Digital cellular telecommunications system (Phase 2+); Universal Mobile Telecommunications System (UMTS); LTE; Single Radio Voice Call Continuity (SRVCC); Stage 2 (V10.0.0; 3GPP TS 23.216 version 10.0.0 Release 10)
The present document specifies the architecture enhancements for Single Radio Voice Call Continuity (SRVCC) between E-UTRAN access and 3GPP2's 1xCS@ and between E-UTRAN access and 3GPP's UTRAN/GERAN accesses and between UTRAN (HSPA) access and 3GPP's UTRAN/GERAN accesses@ for Circuit Switched (CS) calls that are anchored in the IMS. 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 E-UTRAN/UTRAN (HSPA) access to 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 and the handling of IMS emergency call continuity@ are covered in this specification. The handover of non-voice PS bearer from E-UTRAN is specified by the procedures defined in TS 23.401 [2]@ TS 23.060 [10]@ TS 25.413 [11] and TS 43.129 [12]. The handover of non voice PS bearer from UTRAN (HSPA) is specified by the procedures defined in TS 23.060 [10]@ TS 25.413 [11] and TS 43.129 [12]. Handling of SRVCC from 3GPP UTRAN/GERAN CS accesses to E-UTRAN/UTRAN (HSPA) direction is not specified in this release.