Method and terminal for telephone response

Abstract

Embodiments of the present invention provide a method and terminal for telephone response, which relate to the field of communication, and can shorten the calling time delay and improve the called call completion rate. The method is as follows: the terminal sends an extended service request message to the mobility management network element, and the extended service request message is used to indicate that the terminal needs to fall back to the Global System for Mobile Communications GSM or the Evolved Universal Terrestrial Radio Access Network UTRAN; when the terminal determines that the mobility management network element After receiving the extended service request message, and when the preset time arrives, the terminal has not received the fallback instruction from the base station, the terminal determines that it cannot receive the fallback instruction from the base station; the terminal falls back to the GSM / UTRAN execution circuit Switch CS domain call flow. The embodiment of the present invention is applied to fast fallback 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...

AI Technical Summary

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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