Multimode wireless terminal and circuit domain fallback method thereof

Abstract

The invention relates to the field of wireless communication, and discloses a multi-mode wireless terminal and a circuit domain fallback method thereof. In the present invention, the circuit domain method includes the following steps: when the second communication mode is in an idle state, the first communication mode monopolizes the first antenna group, the first and second communication modes share the second antenna group, and the second communication mode uses the shared The second antenna group maintained by the second antenna group maintains the cell information of the second communication mode; when the second communication mode initiates a circuit domain call, the connection is established directly according to the cell information of the second communication mode maintained by the shared second antenna group; when the second communication When the modules are in the connected state, the second communication mode exclusively occupies the second antenna group for voice communication in the circuit domain, and the first communication mode exclusively occupies the first antenna group. The present invention can greatly reduce the circuit domain fallback call setup delay when the first communication mode falls back to the second communication mode in the communication process, and realize voice and data service communication at the same time.

Description

technical field [0001] The invention relates to the field of wireless communication, in particular to a multi-mode wireless terminal. Background technique [0002] With the vigorous development of various Internet applications, the existing third generation (3G, 3 Generation) communication network can no longer meet the growing demands of people. The wireless communication system is increasingly showing the development trend of mobility, broadband and Internet. Under this situation, as the fourth generation (4G, 4 Generation) communication technology, LTE (Long Term Evolution, 3GPP (Third Generation Partnership Project) ) long-term evolution project) will become the direction of network evolution in the future. [0003] The LTE network is based on the Internet Protocol (IP, Internet Protocol) architecture, and can only provide voice over IP (VoIP, Voice over IP) services based on the packet domain (PS, Packet Switched). and service control capability, therefore, it is nece...

AI Technical Summary

Problems solved by technology

Compared with the traditional 2G / 3G voice call, when the terminal falls back from LTE to the 2G / 3G network in the CSFB scheme, there are additional processes such as measurement, synchronization and system message reading of the 2G / 3G target cell, even including location area update ( LU) process, resulting in an increase of call connection delay of 1 to 4 seconds, resulting in a long call connection time or even more than 10 seconds, and poor user experience

In addition, the call setup time increases, and there is a risk of a reduced call setup success rate;

[0007] (2) It takes a long time to return to LTE after the call ends

After the voice service ends on the 2G / 3G network, it returns to the LTE network through reselection. There is a second-level unreachable time, and the terminal cannot perform communication services, which affects user experience;

[0008] (3) If GSM (Global System of Mobile Communication, Global System for Mobile Communication) is dropped, voice and data services cannot be concurrently

[0009] (4) If the GSM is dropped, the calling and called services of the PS cannot be performed because the voice and data services cannot be concurrently

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