Cross-region call processing method, mme, hss and emsc

Abstract

An embodiment of the present invention provides a cross-area call processing method, MME, HSS, and eMSC. The method includes: after receiving a TAU request message initiated by a UE in a call state, sending a location update message to the HSS; The location update confirmation message extracts the STNSR of the ATCF associated with the UE when the UE registers and overflows from the IMS; after receiving the handover request reported by the base station, it sends the eSRVCC handover request message carrying the STNSR of the ATCF to the eMSC, so that The eMSC addresses the outgoing ATCF based on the STNSR of the outgoing ATCF and pre-configured neighboring ATCF information, and completes eSRVCC handover together with the outgoing ATCF. The solution provided by the embodiment of the present invention can ensure that the user can maintain the continuity of the call even if the eSRVCC switching is triggered in the cross-area call state.

Description

technical field [0001] The embodiments of the present invention relate to the technical field of communications, and in particular to a cross-area call processing method, MME, HSS and eMSC. Background technique [0002] VoLTE (Voice over Long Term Evolution, long-term evolution voice) can be used in an LTE (Long Term Evolution, long-term evolution) coverage area to implement a voice service. Wherein, VoLTE refers to an LTE voice service based on IMS (IP Multimedia Subsystem, IP Multimedia Subsystem). When the user roams out of the LTE coverage area, the SRVCC (Single Radio Voice Call Continuity) technology is usually used to switch the user's voice service from VoLTE to the 2G network or 3G network to ensure the continuity of the voice service. [0003] The connection state between the user equipment and the MME (Mobility Management Entity, mobility management entity) during the moving process after the user equipment is turned on can be divided into three states among ECM-...

AI Technical Summary

Problems solved by technology

[0005] In the current network, after the user equipment crosses the province in the call state, the IMS registration of the roaming province will cause call drop; if the IMS registration of the roaming province is not performed, once the user equipment is in the call state and the roaming province triggers eSRVCC handover , since there is no STNSR of the ATCF associated with the current call (that is, the ATCF of the roaming province) on the MME of the province that is roaming in, it will inevitably happen that the eMSC cannot address the ATCF of the province that is roaming out, resulting in the failure of the eSRVCC handover process, and call drops will still occur

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