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CSFB calling method and system

A calling method and a calling system technology, applied in the field of CSFB calling method and system, can solve the problems of not receiving MME, unable to establish a call, call failure, etc.

Active Publication Date: 2019-10-11
CHINA UNITED NETWORK COMM GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] If the return fails, the mobile terminal stays on the 2 / 3G network, and the cell where the mobile terminal resides is the same as the cell that fell back, the location area update process will not be performed, and the MSC cannot perceive the failure of the mobile terminal to return to the 4G network, and still maintains SGs The interface is activated. When the mobile terminal has an incoming call, the MSC still sends a paging request to the MME. At this time, the mobile terminal resides on the 2 / 3G network, cannot receive the paging request from the MME, and cannot establish a call, resulting in call failure.

Method used

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  • CSFB calling method and system

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Such as figure 1 As shown, this embodiment provides a CSFB calling method, including:

[0033] When the CSFB call of the mobile terminal ends, the MSC handles the SGs interface according to the network where the mobile terminal is located: when the mobile terminal returns to the 4G network, the SGs interface is kept active; when the mobile terminal resides in the 2 / 3G network, the SGs is suspended interface;

[0034] When the mobile terminal has an incoming call to page, the MSC performs paging according to the state of the SGs interface.

Embodiment 2

[0036] Such as figure 1 , 2 As shown, this embodiment discloses a CSFB calling method, wherein the mobile terminal has a 4G multi-mode card, and the 4G multi-mode card selects the CSFB technology to implement voice calls.

[0037] The method comprises the steps of:

[0038] Step 101, when the mobile terminal is turned on, start the joint attachment process of the 4G multi-mode card;

[0039] The joint attach process is specifically that the 4G multimode card of the mobile terminal sends an Attach Request message to the MME, in which the parameter Attach Type indicates that this is a joint EPS / IMSI attach process, and the parameter indicates that the mobile terminal has the CSFallback capability, and the MME sends SGsAP-LOCATION- The UPDATE-REQUEST message is sent to the corresponding VLR. The message includes parameters such as new LAI, IMSI of the 4G multi-mode card, MME name, and Location Update Type. The VLR stores the MME information and creates an association with the S...

Embodiment 3

[0060] This embodiment provides a CSFB calling system, including MSC, MME, mobile terminal,

[0061] The MSC is used to process the SGs interface according to the network where the mobile terminal is located after the CSFB call of the mobile terminal ends: when the acquired mobile terminal returns to the 4G network, keep the SGs interface active; when the acquired mobile terminal resides in the 2 / 3G network, hang Start the SGs interface;

[0062] The MSC is also used to page the mobile terminal according to the status of the SGs interface when there is an incoming call.

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Abstract

The invention discloses a CSFB (Call Session Fallback) calling method, which comprises the following steps that: after a CSFB call of a mobile terminal is finished, an MSC (Mobile Switching Center) processes an SGs (Serving Gateway) interface according to a network in which the mobile terminal is located: when the mobile terminal returns to a 4G network, an SGs interface is kept in an activated state; when the mobile terminal resides in the 2 / 3G network, the SGs interface is suspended; and when the mobile terminal has incoming call paging, the MSC performs paging according to the state of theSGs interface. Correspondingly, the invention further discloses a CSFB calling system. When the mobile terminal fails to return to the 4G network from the 2 / 3G network and the resident cell is the same as the falling cell, the mobile terminal can still be paged, so that the situation of call failure is avoided.

Description

technical field [0001] The present invention relates to the technical field of communication, in particular to a CSFB calling method and system. Background technique [0002] At present, in the 4G network, when the voice call service is performed, the Circuit Switch Fall Back (CSFB) technology is usually used to drop the 4G (4th Generation) voice call service to the 2G (2nd Generation) network or 3G (3rd Generation) network. , to provide voice services through the 2 / 3G network; when the voice call ends, it needs to return to the 4G network from the 2 / 3G network. [0003] If the return fails, the mobile terminal stays on the 2 / 3G network, and the cell where the mobile terminal resides is the same as the cell that fell back, the location area update process will not be performed, and the MSC cannot perceive the failure of the mobile terminal to return to the 4G network, and still maintains SGs When the interface is activated, when the mobile terminal has an incoming call, the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04W8/24H04W36/14H04W68/02
CPCH04W8/24H04W36/14H04W68/02
Inventor 张余
Owner CHINA UNITED NETWORK COMM GRP CO LTD
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