Single wireless channel voice business continuity field switching method

Abstract

A domain switching process of the continuity of a single radio channel voice service comprises that an UE switches in an IMS domain from an LTE / SAM network, the LTE / SAM networking initiates the switching request from the LTE / SAM to a CS domain after building up a conversation with far-end nodes, a target GERAN / UTRAN sends the switching finish message to a VMSC when the UE is switched in the target GERAN / UTRAN of the CS domain, the VMSC sends the MAP sending finish signal message to an S-IWF to inform the S-IWF that the UE has switched in the CS switch-in network from the LTE / SAE network, an VCC AS is informed to release the VCC AS of the conversation to the IMS network resource of the LTE / SAE network after the UE sends the switching finish message or after the S-IWF has received the MAP sending finish signal message. And the single radio channel voice service can return back to the original conversation channel according to the original conversation resource when the UE switching is failed.

Description

technical field [0001] The present invention relates to the field of communications, and more particularly, relates to a method for accessing single wireless channel voice service continuity ( Single Radio VoiceCall Continuity, referred to as SRVCC) domain switching method. Background technique [0002] In order to ensure the continuity of voice services between the circuit (Circuit Switched, referred to as CS) domain and the IP (Internet Protocol, Internet Protocol) multimedia subsystem (IP Multimedia Core Network Subsystem, referred to as IMS) domain, that is, Voice Call Continuity (Voice Call Continuity) , referred to as VCC), the traditional solution is shown in Figure 1: [0003] Dual-mode user equipment (User Equipment, referred to as UE), registered in both the CS domain and the IMS domain, when the UE initiates a voice service in the CS domain or the IMS domain, it is anchored to the voice service continuity application server (Voice Call Continuity Application Ser...

AI Technical Summary

Problems solved by technology

[0068] The above technology has the following problem: after the ICCF / VCC AS receives the ISUP initial address message (step 106 and step S111), it will release the session established between the ICCF / VCC AS and the UE via LTE / SAE, and the UE may The handover command has not been received, or the handover is in progress. The session path at this time is shown in Figure 6. There is only CS network between the UE and the remote node-the remote node is connected. Only when the UE is successfully handed over to the CS domain, the UE and the remote node are connected

If the UE fails to switch to the CS domain successfully, the current session of the UE will be released, because the UE cannot return to the original session channel to continue the session

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