Voice service switching method, terminal device and chip

Abstract

The embodiment of the invention provides a voice service switching method, terminal equipment and a chip. The method comprises the following steps: the terminal equipment uses a first network to carry out IMS registration and starts an IMS timer; if the PDU session is not established within the timing duration of the IMS timer, determining first retry time of the PDU session establishment request and starting a first timer for timing; and if the PDU session is established within the timing duration of the IMS timer but IMS registration is not completed, determining second retry time of the IMS registration request and starting a second timer to time. And forbidding the first network within the retry time and switching to use the second network to establish the IMS voice service or the circuit switched fallback CSFB voice service, stopping using the second network when the timing duration of the timer reaches the retry time, and switching to use the first network to establish the IMS voice service. According to the embodiment of the invention, the terminal can use the 5G network to the maximum extent, and the terminal is prevented from ping-pong between the 5G network and the 4G network.

Description

technical field [0001] The present application relates to the technical field of mobile communication, in particular to a voice service switching method, terminal equipment and a chip. Background technique [0002] 5G (NR) is the fifth-generation mobile communication network. It is a brand-new mobile communication technology. Compared with 2 / 3 / 4G technology, it can provide access with large bandwidth, full connection and low latency. The Internet protocol (internet protocol, IP) multimedia subsystem (IP multimedia subsystem, IMS) is a network system for providing multimedia services based on an IP network. The IMS can provide voice solutions for 4G networks and 5G networks. [0003] Generally speaking, when the 4G network supports Circuit Switch fallback (CSFB), before the IMS registration is successful, the voice communication can be performed through the 4G network fallback to the 2 / 3G network, so the voice communication can be guaranteed through the CS domain , the termi...

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Problems solved by technology

[0004] However, the voice communication under the 5G network can only be carried out through the IMS domain, and the voice communication cannot be guaranteed before the IMS registration is successful. At this time, the terminal device cannot reside in the 5G network for a long time.

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