Circuit domain fallback method, base station and terminal

A circuit domain fallback and base station technology, applied in the field of communications, can solve the problems of inability to normally complete CS voice services, CSFB failure, poor user experience, etc., to avoid fallback failure, improve success rate, and ensure the effect of user perception
CN107592644BActive Publication Date: 2020-11-06CHINA UNITED NETWORK COMM GRP CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
CHINA UNITED NETWORK COMM GRP CO LTD
Publication Date
2020-11-06

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Abstract

The invention provides a circuit switched fallback (CSFB) method, a base station and a terminal. A delay decision timer is added on a base station side, and the base station starts the delay decisiontimer when a first measurement report is received and acquires an inter-system frequency point with the highest signal strength and transmits the inter-system frequency point with the highest signal strength to the terminal after timing of the delay decision timer arrives at preset time, so that the terminal falls back to the inter-system frequency point with the highest signal strength to initiate a voice service request; the success rate of CSFB is increased; a fallback instruction is transmitted to the terminal not only according to the first measurement report; the randomness in selectinga first inter-system frequency point when the terminal measures the signal strength is avoided; fallback failure of the terminal caused by fallback through an inter-system frequency point with a relatively weak signal is avoided; CSFB call delay is not increased excessively; and user perception is ensured.
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Description

technical field

[0001] The present invention relates to the field of communication technologies, and in particular to a circuit domain fallback method, a base station and a terminal. Background technique

[0002] The LTE (Long Term Evolution, Long Term Evolution) network designed based on the all-IP design of the packet domain cannot bear traditional circuit domain voice services. The target solution for carrying voice is the VoLTE (Voice The Over LTE) solution carries a VoIP service (Voice over Internet Protocol, VoIP). However, before the VoLTE industry is mature and the LTE network is ready, it is still necessary to use the 2G / 3G network to carry voice, that is, to use the CSFB (Circuit Switched Fallback) solution to directly use the 2 / 3G network to provide voice services. The basic idea of ​​the CSFB solution is that when the terminal resides in the idle state of the LTE network or in the connection state of the data service, when there is a voice service demand (callin...

Claims

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