Telephone response method and terminal

Abstract

The embodiment of the invention provides a telephone response method and a terminal, and relates to the field of communication. The delay of the caller can be shortened, and the call rate of the called can be improved. The method comprises the following steps: the terminal sends an extended service request message to a mobile management network element, wherein the extended service request messageis used for indicating the terminal to fall back to a global mobile communication system (GSM) or an evolved universal terrestrial radio access network (UTRAN); when the terminal determines that themobile management network element receives the extended service request message, and the terminal does not receive a different system drop indication sent by a base station at the arrival of a presettime, the terminal determines that the different system drop indication sent by the base station cannot be received; and the terminal drops to the GSM / UTRAN to execute a circuit switching (CS) domaintelephone flow. The telephone response method provided by the embodiment of the invention is applied to the fast drop in CSFB.

Description

technical field [0001] The invention relates to the communication field, in particular to a method and terminal for telephone response. Background technique [0002] With the rapid development of mobile communication technology, the International Organization for Standardization 3rd Generation Partnership Project (3rdGeneration Partnership Project, 3GPP) proposed the Long Term Evolution (LTE) network architecture, which provides a high-bandwidth wireless access network with High data transmission rate, low latency, optimized packet data and many other advantages. At present, the voice service is still one of the main services of various operators. Due to the insufficient coverage in the early stage of LTE network construction, for example, the Internet Protocol Multimedia Subsystem (IMS) adopted by LTE is still in the construction process, and most user equipment (User Equipment) , UE) and networks currently do not support IMS, and the construction of Global System for Mobi...

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Problems solved by technology

[0004] In the above process, when the cooperation between network elements is abnormal, the eNodeB may not receive the CSFB instruction from the core network, or the eNodeB may not issue a different system instruction to the terminal due to reasons such as abnormal cooperation between network elements, or the signal quality Due to mutation and other reasons, the UE did not receive the redirection instruction from the base station for a period of time, and the call failed, affecting user experience

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