METHOD FOR REALIZING SINGLE RADIO VOICE CALL CONTINUITY AND SINGLE RADIO VOICE CALL CONTINUITY SYSTEM.

摘要

A method for realizing single radio voice call continuity includes the following steps: a User Equipment (UE) sets up an IP Multimedia Core Network Subsystem (IMS) session with a remote user through a Packet Switch (PS) network, while the IMS session is anchored to an enhanced Mobile Switch Center (eMSC); the PS network sends a handover request to the eMSC to request that the IMS session is handed over to be accessed through a Circuit Switch (CS) network; the eMSC receives the handover request, establishes a media link, and relates the newly established media link to the remote media link of the IMS session, so that the UE can call the remote user through the newly established media link and the remote media link. The present invention also provides a system and an eMSC for supporting single radio voice call continuity. By anchoring the signaling and the media of the IMS session, the present invention avoids the update operation for the media of the remote user, and reduces the interruption time of the call.