A method and device for establishing a call connection

Abstract

An embodiment of the invention relates to the technical field of communications, and in particular relates to a method and a device for establishing call connection, which are used for improving the success rate of establishing the call connection between a called terminal and a calling terminal. Terminals reside in an LTE (Long Term Evolution) network, and receive paging messages, which are issued by a core network, under the LTE network; the terminals send extended service requests to the core network, wherein the extended service requests are used for requesting the core network to send redirection messages to the terminals; when determining that the redirection messages sent by the core network are not received within a preset time interval, the terminals determine that a 2G / 3G (Second Generation / Third Generation) network near the terminals is searched; the terminals send first location updating requests to the core network; the terminals receive first location updating responses sent by the core network, enable the 2G / 3G network to reside, and establish the call connection according to the paging messages. By using the method provided by the embodiment of the invention, that even if the terminals do not receive the redirection messages within the preset time interval, the call connection can still be successfully established; thus, the success rate of establishing the call connection between the called terminal and the calling terminal is improved.

Description

technical field [0001] The embodiments of the present invention relate to the communication field, and in particular to a method and device for establishing a call connection. Background technique [0002] With the rapid development of communication technology, Long Term Evolution (LTE for short) network, as the main evolution direction of mobile communication at present, has been paid more and more attention by major operators and equipment manufacturers. Currently, a terminal can use both the LTE network and the 2G / 3G network. The LTE network cannot support voice services in the Circuit Switched (CS) domain, while the 2G / 3G network supports voice services in the CS domain. At present, in order to enable terminals to receive paging of voice services under LTE access, Circuit Switched Fallback (CSFB) technology is adopted, that is, terminals preferentially reside on the LTE network to enjoy high-speed data services. When the called (Mobile Terminating Call, MTCall for short...

AI Technical Summary

Problems solved by technology

For example, if the core network fails to parse the ESR message successfully, it will not send a redirection message to the called terminal. At this time, the called terminal cannot receive the redirection message within the preset duration of the T3417_EXT timer, causing the called terminal to communicate with the host Failed to call terminal to establish MTCall call connection

It can be seen that the success rate of establishing a call connection between the called terminal and the calling terminal in the prior art is low

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