Method for realizing single mode business continuity and single mode business continuity system

摘要

A method for implementing single radio voice call continuity, comprises: User Equipment (UE) establishing an IP Multimedia Core Network Subsystem (IMS) session with a remote user through a Packet Switch (PS) network, wherein the IMS session is anchored to an enhanced Mobile Switch Center (eMSC); the PS network sending a handover request to the eMSC for handing over the IMS session to gain access through a Circuit Switch (CS) network; the eMSC receiving the handover request, establishing a media link, and relating a newly established media link with a remote media link of the IMS session, so that the UE can communicate with 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 carrying out update operation on the media of the remote user and reduces the interruption time in the call.