Single-mode service continuity implementation method and single-mode service continuity system

Abstract

A method for realizing a single radio voice call continuity and a single radio voice call continuity system are disclosed. After a UE-1 establishes an IMS session with a remote leg through a PS network, wherein in the IMS session, signaling is anchored to an ICP and media is anchored to an AGW controlled by the ICP, the method is realized as follows: sending a handover request by a control net element of the PS network to an eMSC to request a handover of the IMS session to a CS network access mode; after receiving the handover request, preparing a media link resource by the eMSC for the UE-1 to communicate with the eMSC and sending a call request to the ICP; and controlling the AGW to correlate a media link established by the call request with a remote leg media link of the IMS session by the ICP. The method can effectively solve the problem existing in the prior art that the duration of interruption is too long, and improve user experience.

Description

technical field [0001] The invention relates to the communication field, in particular to a single-mode service continuity realization method and a single-mode service continuity system. Background technique [0002] IP Multimedia Core Network Subsystem (IMS for short) is an IP-based network architecture proposed by the 3rd Generation Partnership Project (3GPP for short), which builds an open and flexible service environment, supports multimedia applications, and can provide users with rich multimedia services. [0003] In the IMS service system, the control layer and the service layer are separated, and the control layer does not provide specific services, but only provides necessary functions such as triggering, routing, and charging to the service layer. [0004] The triggering and control functions of services in the control layer are performed by a call session control function (Call Session Control Function, CSCF for short). The call session control function is divid...

AI Technical Summary

Problems solved by technology

[0050] It can be seen from the above that since the SC AS set in the home network does not anchor the media path, the existing single-mode service continuity implementation method needs to perform an update operation on the remote user in steps 310-311, and The transmission delay of the IMS signaling for the update operation is relatively long, which will cause a long time to wait for the new media path to be established after the CS media is established, thus causing the call interruption time to be too long

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