Patent ID: 9326302
Filing Date: 2016-04-26
CPC Classification: H04L,H04W

Claim Text:
1. A method for implementing reverse Single Radio Voice Call Continuity (rSRVCC), comprising the following steps of: upon receiving a handover request for a terminal from a Circuit Switch (CS) domain, sending by a current Mobile Switch Center (MSC) a transfer request regarding the terminal or a session in which the terminal participates to an IP Multimedia Core Network Subsystem Control Function Entity (ICFE); and after receiving the transfer request, initiating by the ICFE a media connection establishment flow between the terminal and a far end; wherein, when signaling anchors the current MSC, the step of initiating by the ICFE a media connection establishment flow between the terminal and the far end after receiving the transfer request comprises: sending by the ICFE a connection establishment message to the terminal through the current MSC after receiving the transfer request; wherein, when media anchors the current MSC, the transfer request carries transfer request association information; and, the media connection establishment flow comprises: sending by the ICFE to the terminal the connection establishment message through the MSC, wherein the connection establishment message carries the transfer request association information, and the connection establishment message forwarded by the current MSC to the terminal carries media resource information of the current MSC; establishing by the current MSC a media connection with the terminal after receiving a message carrying media resource information from the terminal; and associating by the current MSC the media connection between the current MSC and the terminal with the media connection between the current MSC and the far end according to the transfer request association information.