Method, device and system for processing reverse single radio voice call continuity

摘要

The present invention provides a method, device, and system for processing reverse single radio voice call continuity. The method includes, before handing over a voice service from a CS domain network to a PS domain network, preconfiguring, in the PS domain network by a UE, information about resources needed for the voice service handover; and in the process of handing over, by the UE, the voice service from the CS domain network to the PS domain network, establishing a forwarding channel between a first network element of the PS domain and a second network element of the CS domain by using the preconfigured information about resources, where the forwarding channel is configured to forward voice service data between the UE and a peer UE after the UE accesses the PS domain network.

主权项

1. A method for processing reverse single radio voice call continuity, comprising:
during or before handing over a voice service from a circuit switched domain network to a packet switched domain network, performing an IMS registration; and in the process of handing over, by the user equipment, the voice service from the circuit switched domain network to the packet switched domain network, establishing a forwarding channel between a first network element of the packet switched domain network and a second network element of the circuit switched domain network, wherein the forwarding channel is configured to transmit voice service data between the user equipment and a peer user equipment after the user equipment accesses the packet switched domain network, and wherein the first network element is an access transfer gateway (ATCF/ATGW) and the second network element is a mobile switching center supporting a reverse single radio voice call continuity (SRVCC) service; wherein the establishing the forwarding channel between the first network element of the packet switched domain network and the second network element of the circuit switched domain network uses preconfigured information about resources needed for the handing over and comprises controlling, by a mobility management entity (MME) using the preconfigured information about resources, the establishment of the forwarding channel between the first network element of the packet switched domain network and the second network element of the circuit switched domain network; wherein the controlling the establishment of the forwarding channel comprises the second network element forwarding a handover request to the MME; and wherein the preconfigured information about resources comprises at least context information that is pre-registered in the packet switched domain network by the user equipment, and the context information comprises at least information about a session transfer number for the reverse voice call continuity service (STN-SR).