Method and system for implementing reverse single radio voice call continuity
AssigneeZte Corporation
InventorsZhenhua Xie, Quanjun Tao
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Abstract
A method and system for implementing reverse Single Radio Voice Call Continuity (rSRVCC) are provided in the present invention. The method includes: after receiving a handover request from a Circuit Switch (CS) domain, a current Mobile Switch Center (MSC) sending a transfer request regarding a terminal subscriber or a session in which the terminal subscriber participates to an IP Multimedia Core Network Subsystem (IMS) Control Function Entity (ICFE); and after receiving the transfer request, the ICFE initiating a media connection establishment flow between the terminal and a far end. The technical solution of the present invention ensures rSRVCC when a terminal hands over from a CS domain to a PS domain.
Claims17
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.
A method for implementing reverse Single Radio Voice Call Continuity (rSRVCC), comprising the following steps of:
- upon receiving by a current Mobile Switch Center (MSC) a handover request for a terminal from a Circuit Switch (CS) domain, a handover command being immediately sent to the CS domain to reach a base station system of the CS domain and sending by the current MSC a first transfer request regarding the terminal or a session in which the terminal participates to an IP Multimedia Core Network Subsystem Control Function Entity (ICFE), the first transfer request sent from the current MSC to the ICFE carrying handover terminal subscriber association information according to which the ICFE can determine the corresponding terminal;
- after accessing a destination network, sending by the terminal a second transfer request, the second transfer request targeting the ICFE or passing the ICFE;
- and,
- after receiving the second transfer request, sending by the ICFE a transfer response to the terminal.
A system for implementing reverse Single Radio Voice Call Continuity (rSRVCC), comprising a Mobile Switch Center (MSC), a terminal and an IP Multimedia Core Network Subsystem Control Function Entity (ICFE), wherein:
- the MSC comprises a processor which executes steps of:
- when the MSC is a current MSC, upon receiving a handover request for the terminal from a Circuit Switch (CS) domain, sending a first transfer request regarding the terminal or a session in which the terminal participates to the ICFE, wherein a handover command is immediately sent to the CS domain to reach a base station system of the CS domain upon the MSC receives the handover request for the terminal from the CS domain, and the first transfer request sent from the MSC to the ICFE carries handover terminal subscriber association information according to which the ICFE can determine the corresponding terminal;
- the terminal comprises a processor which executes steps of:
- after accessing a destination network, sending a second transfer request;
- the second transfer request targeting the ICFE or passing the ICFE;
- the ICFE comprises a processor which executes steps of:
- sending a transfer response to the terminal after receiving the second transfer request.
Dependencies are inferred from the claim text.