Cross-region call processing method, MME, HSS and eMSC

Abstract

The embodiment of the invention provides a cross-region call processing method, an MME, an HSS and an eMSC, and the method comprises the steps: after receiving a TAU request message initiated by UE ina call state, sending a position updating message to the HSS; extracting an STNSR associated with an overflow ATCF when the UE registers the overflow IMS from a location update confirmation message returned by the HSS; receiving a switching request reported by the base station; and sending an eSRVCC switching request message carrying the STNSR of the overflow ATCF to an eMSC, and enabling the eMSC to address the overflow ATCF based on the STNSR of the overflow ATCF and pre-configured adjacent ATCF information, and completing eSRVCC switching together with the overflow ATCF. According to the scheme provided by the embodiment of the invention, the call continuity can be kept even if the user triggers the eSRVCC switching in a cross-region 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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