Method, device and mobile terminal for implementing single radio frequency voice call continuity before ringing

Abstract

The invention provides a method and apparatus for implementing single radio voice call continuity before ringing, and a mobile terminal. The method comprises the following steps: sending a call establishment request message to an LTE network; receiving indication switching information issued by the LTE network when the signal of the LTE network becomes worse; when it is unknown that whether the LTE network supports switching of the single radio voice call continuity before ringing bSRVCC switching, defaulting that the LTE network supports the bSRVCC switching, and switching a network access module from an LTE module to a 2 / 3G module; synchronizing a call state under the LTE module to a circuit switching domain of the 2 / 3G module; when a message indicating that a call of the circuit switching domain is being established and sent by a network side is received, continuing to perform a subsequent call establishment action, or otherwise, performing call drop. By adoption of the method and apparatus provided by the invention, the failure rate of the bSRVCC switching before a session progress message is received can be reduced, thereby reducing the probability of call drop.

Description

technical field [0001] The present invention relates to the technical field of wireless communication, and in particular, to a method, a device and a mobile terminal for realizing the continuity of a single radio frequency voice call before ringing. Background technique [0002] With the continuous development of mobile phone technology and the gradual deepening of 4G networks, 4G-based voice services have developed rapidly. 4G-based voice services are an IP data transmission technology that can carry all services on the 4G network. There is no need to rely on the previous 2G / 3G network, so as to realize the unification of data and voice services on the same network; that is to say, through the support of 4G-based voice services, we can not only enjoy high-speed data in the 4G network. data services, and it can also be used for higher-quality voice and video calls. [0003] The single-radio voice call continuity scheme is a standard scheme to keep the phone continuous when ...

AI Technical Summary

Problems solved by technology

[0007] In the prior art, for the case where the terminal receives a handover instruction from the network before receiving the session progress message, it will be assumed that the network does not support bSRVCC by default, regardless of whether the actual network supports bSRVCC, it will appear because the default network does not support bSRVCC causes the problem that the terminal does not switch, resulting in phone call drop phenomenon

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