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A csfb calling method and system

A calling method and calling system technology, applied in the field of CSFB calling method and system, can solve problems such as not receiving MME, failing to establish a call, calling failure, etc., and achieve the effect of avoiding call failure

Active Publication Date: 2022-03-18
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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  • A csfb calling method and system
  • A csfb calling method and system
  • A 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 call method, including:

[0033] When the mobile terminal CSFB is over, the MSC processes the SGS interface according to the network where the mobile terminal is located: When the mobile terminal returns to the 4G network, keep the SGS interface is activated; when the mobile terminal resides in 2 / 3G network, then SGS interface;

[0034] When the mobile terminal has a call piping, the MSC pactions according to the status of the SGS interface.

Embodiment 2

[0036] Such as figure 1 , 2 As shown, a CSFB call method is disclosed in the present embodiment, wherein the mobile terminal has a 4G multi-mode card, 4G multi-mode card selection CSFB technology to implement voice calls.

[0037] The method includes the following steps:

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

[0039] The joint attachment process specifically transmits an ATTACH Request message to the MME for the 4G multi-mode card of the mobile terminal, where parameter attach type indicates a combined EPS / IMSI attachment process, and the parameter indicates that the mobile terminal has CSFallback capabilities, MME sends SGSAP-Location- Update-request message gives the corresponding VLR, including the NEW LAI, 4G Module IMSI, MME Name, and Location Update Type, VLR stores MME information, and creates SGS association with 4G multi-mode card under MME, VLR According to the user information and locati...

Embodiment 3

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

[0061] MSC, for processing SGS interface according to the network where the mobile terminal is located, after the mobile terminal is located, the SGS interface is maintained when the mobile terminal returns to the 4G network; when the mobile terminal resides in 2 / 3G network SGS interface;

[0062] The MSC is also used to pace it according to the status of the SGS interface when there is a call piping on the mobile terminal.

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Abstract

The invention discloses a CSFB calling method. When the CSFB call of a mobile terminal ends, the MSC processes 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 in an active state; when the mobile terminal resides in 2 / 3G network, the SGs interface is suspended; when the mobile terminal has an incoming call to page, the MSC performs paging according to the status of the SGs interface. Correspondingly, a CSFB calling system is also disclosed. The method and system can realize that when the mobile terminal fails to return to the 4G network from the 2 / 3G network, and the cell where the mobile terminal resides is the same as the cell where it falls back, the mobile terminal can still be paged, thereby avoiding call failure.

Description

Technical field [0001] The present invention relates to the field of communication technologies, and more particularly to a CSFB call method and system. Background technique [0002] Currently, in the 4G network, when the voice call service is performed, the CircuitSwitch Fall Back, CSFB will fall back to 2G (2ndgeneration) network or 3G (3rd generation) network Voice traffic by 2 / 3G network; when the voice call is over, you need to return 4G network from 2 / 3G network. [0003] If the mobile terminal resides in the 2 / 3G network, the mobile terminal resides, and the resident community is the same as the falling cell, and the location area update flow is not performed. The MSC cannot perceive the mobile terminal to return 4G network failure, still keep SGS Interface activation state, when the mobile terminal has an incoming call, the MSC still issues a paging request, and at this time, the mobile terminal resides in the 2 / 3G network, receives a paging request of the MME, an...

Claims

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Application Information

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Patent Type & Authority Patents(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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