Method for switching the session control path of IP multimedia core network subsystem centralized service

摘要

A method for switching the session control path of IMS centralized services is provided. When the condition for switching the session control path is satisfied during the ICS session based on the first session control path, the following steps are performed: one party of the ICS UE and ICCF of the ICS session transmits the request of switching the session control path to the other party; the receiving party identifies the ICS session corresponding to the request, and transmits an acknowledgement response to the transmitting party; and the ICCF and ICS UE set the session control path corresponding to the identified ICS session as the second session control path and transfer the subsequent session control information associated with the ICS session via the second session control path; wherein the first or second session control path is one of the PS session control path and the CS session control path.

主权项

1. A method for switching a session control path of an internet protocol multimedia core network subsystem centralized service, wherein, during an internet protocol multimedia core network subsystem centralized service session based on a first session control path, when a condition for switching the session control path is satisfied, the following steps are performed:
A: one party of: party (a) an internet protocol multimedia core network subsystem centralized service user equipment and party (b) an internet protocol multimedia core network subsystem circuit switched control function corresponding to the internet protocol multimedia core network subsystem centralized service session transmits a request for switching the session control path to another party, wherein each of party (a) and party (b) can transmit the request for switching the session control path; B: after a receiving party of the request for switching the session control path receives the request, the receiving party identifies the internet protocol multimedia core network subsystem centralized service session corresponding to the request and sends a response of session control path switching acknowledgement to a transmitting party of the request; and C: said internet protocol multimedia core network subsystem circuit switched control function and said internet protocol multimedia core network subsystem centralized service user equipment sets the session control path corresponding to the identified internet protocol multimedia core network subsystem centralized service session as a second session control path, and subsequent session control information associated with the internet protocol multimedia core network subsystem centralized service session is transferred through the second session control path; wherein each of the first or second session control path is one of a packet switched session control path and a circuit switched session control path; and wherein the first and second session control paths are of different kinds of control paths; wherein said condition for switching the session control path is one or more of the following: (a) a domain interface corresponding to said first session control path does not meet communication requirement of the session control path or is not available, while a domain interface corresponding to the second session control path meets the communication requirement of the session control path; (b) according to service requirements, the session control path needs to be switched to the second session control path; (c) a message indicating to switch the session control path sent by the network according to operator's strategy is received; or (d) the session control path is switched to the second session control path based on internet protocol multimedia core network subsystem network management strategy, and wherein during the whole process of switching the session control path, a bearer control path and a bearer path of the session remain unchanged.