Determination method for voice service scheme of VoLTE (Voice over Long Term Evolution) terminal and VoLTE terminal

Abstract

The invention provides a determination method for a voice service scheme of a VoLTE (Voice over Long Term Evolution) terminal and the VoLTE terminal. The method comprises the following steps: reselecting from a 2G / 3G (Two-Generation / Three-Generation) cell to an LTE cell by the VoLTE terminal according to cell signal intensity measured in a preset range; if a reselected LTE cell identity is stored at the VoLTE terminal, transmitting a first position updating request to a mobile management entity MME by the VoLTE terminal, wherein a VoLTE voice service scheme restriction identity is carried in the first position updating request, so an IMS (IP Multimedia Subsystem) unregistration request message of the VoLTE terminal is transmitted to an IMS by a home subscriber server HSS according to the VoLTE voice service scheme restriction identity carried in a first position updating message; receiving, by the VoLTE terminal, an IMS unregistration success response message transmitted by the IMS; determining circuit switched fallback CSFB according to the IMS unregistration success response message to serve as the voice service scheme of the VoLTE terminal to perform the voice service.

Description

technical field [0001] The embodiment of the present invention relates to the field of communication technologies, and in particular to a method for determining a voice service scheme of a VoLTE terminal and a VoLTE terminal. Background technique [0002] Compared with the 2G / 3G network, the Long Term Evolution (LTE for short) network has only the Packet Switch Domain (PS Domain for short) and no Circuit Switched Domain (CS Domain for short), so the LTE network Realizing the voice service in the middle is the technology that the operator mainly considers. The voice service solution (Voice over LTE, referred to as VoLTE) based on the multimedia subsystem (IP Multimedia Subsystem, referred to as IMS) has become the target solution, which can cooperate with the LTE network or 4G core network (Evolved Packet Core, referred to as the EPC network) to achieve End-to-end voice service based on PS domain. [0003] According to the 3rd Generation Partnership Project (3GPP agreement ...

AI Technical Summary

Problems solved by technology

Since the SRVCC technology requires the remote terminal to update the media plane through the IMS network, the handover interruption time is relatively long, and because the SRVCC signaling process, the IMS domain handover and the synchronization mechanism of the air interface handover are not perfect, the handover process is relatively complicated, so The success rate of switching is not high

Therefore, for VoLTE terminals that frequently perform voice services in LTE network coverage cells and move from LTE cells to 2G / 3G cells in a short period of time, when SRVCC technology is used for voice service handover, the handover interruption time is long and the handover success rate is low. High, which seriously affects the communication quality of VoLTE terminal voice services, and the user experience is poor

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