Dual-mode single-standby voice service continuity realization method and Internet protocol (IP) multimedia subsystem

Abstract

The invention provides a dual-mode single-standby voice service continuity realization method and an Internet protocol (IP) multimedia subsystem. The method comprises the following steps that: A, when local user equipment issues a session request from a long-term evolution (LTE) network, a service continuity control application server (SCC AS) in an information management system (IMS) anchors media links of the local user equipment and opposite user equipment onto a media functional processing entity in the IMS; and B, after the local user equipment is switched from evolved universal terrestrial radio access network (E-UTRAN) access to Gsm edge radio access network (GERAN) / terrestrial radio access network (UTRAN) access, the SCC AS updates the media link of the local user equipment to be the media link between a mobile switching center (MSC) Server and the media functional processing entity. By the method and the subsystem, the interruption time of a media plane in the switching of the user equipment from the LTE network to a 2G / 3G network can be shortened, and user experiences are improved.

Description

technical field [0001] The invention relates to the field of wireless communication, in particular to a method for realizing dual-mode single-standby voice service continuity (SRVCC) and an IP multimedia subsystem (IMS). Background technique [0002] In the initial stage of Long-Term Evolution (LTE) network construction, its signal coverage is limited. When a user uses the LTE network for voice calls and moves to a place where the LTE network signal is weak but the 2G / 3G network signal coverage is better, In order to maintain the continuity of the voice service, it is necessary to switch the voice call from the LTE network to the 2G / 3G network. Since there is currently no terminal capable of simultaneously attaching to and sending and receiving data on both the LTE network and the 2G / 3G network, the voice service continuity between the LTE network and the 2G / 3G network is based on the dual-mode single-standby mode. [0003] At present, the third generation partnership (3GPP...

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Problems solved by technology

However, due to the uncertainty of the UE's access location, for example, the user may be roaming, the delay of the session update signaling from the SCC AS to the remote UE and the update of the media link may take a long time, In this way, when the terminal switches from the LTE network to the 2G / 3G network, it cannot receive the media of the peer UE within a certain period of time, which will cause the user to experience a period of sound interruption and poor user experience.

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