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A call implementation method, device and terminal for circuit domain fallback

A technology of circuit domain fallback and implementation method, applied in the field of wireless communication, can solve the problems of CSFB calling failure affecting user experience, etc., and achieve the effect of improving user experience

Active Publication Date: 2021-01-15
CHINA MOBILE COMM LTD RES INST +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] The purpose of the technical solution of the present invention is to provide a call implementation method, device and terminal for circuit domain fallback, which is used to solve the problem in the prior art that CSFB call failure affects user experience

Method used

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  • A call implementation method, device and terminal for circuit domain fallback
  • A call implementation method, device and terminal for circuit domain fallback
  • A call implementation method, device and terminal for circuit domain fallback

Examples

Experimental program
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Effect test

Embodiment 1

[0046] refer to figure 2 According to the first embodiment of the present invention, the circuit domain fallback CSFB call implementation method is applied to a terminal, and the call implementation method includes the steps of:

[0047] S210, within the first period of time after sending the CSFB service request, monitor whether a valid redirection signaling is received;

[0048] S220. When the effective redirection signaling is not received, select a cell that can be camped on and call in a cell that can be camped on and obtained by searching in the inter-system standard that was dropped back when the historical CS domain fallback is successfully completed.

[0049] Specifically, combined with figure 1 , using the CSFB call implementation method described in the embodiment of the present invention, before step S210, the terminal UE may send a CSFB service request to the mobility management node MME, the mobility management node MME sends a CSFB indication message to the ba...

Embodiment 2

[0059] refer to image 3 The method for implementing a CSFB call in CSFB fallback according to Embodiment 2 of the present invention is applied to a terminal, and the method for implementing a call includes the steps of:

[0060] S310, within the first period of time after sending the CSFB service request, monitor whether a valid redirection signaling is received;

[0061] S320, when no valid redirection signaling is received within the second period of time after sending the CSFB service request, search in the different system standard that was dropped when the historical circuit domain fallback was successfully completed, and obtain a resident cell; wherein the first duration is greater than the second duration;

[0062] S330. When valid redirection signaling is not received within the first period of time after the CSFB service request is sent, select a resident cell that can be searched and obtained in the different system standard that was dropped when the historical cir...

Embodiment 3

[0074] refer to Figure 4 According to the third embodiment of the present invention, the circuit domain fallback CSFB call implementation method is applied to a terminal, and the call implementation method includes the steps of:

[0075] S410, the terminal sends a CSFB service request to the mobile management node MME, starts the first timer and the second timer, and sets the timing length of the first timer to be the first duration, and the timing length of the second timer to be the second duration ;

[0076] Specifically, the second timer may be called an alien system background search timer, the first timer may be called an alien system redirect timer, and the first duration is longer than the second duration. The length setting of the second duration can refer to the signal strength of the current LTE serving cell. For example, when the terminal sends a CSFB service request, if it is measured in real time that the signal strength of the current LTE serving cell is lower...

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Abstract

The invention provides a CSFB call realization method and device and a terminal. The method comprises that within a first time length after that a CSFB service request is sent, whether an effective redirection signaling is received is monitored; and if NO, a cell that can be resided in and is obtained by searching a fallback disparate system standard when historical CSFB succeeds is selected and acall is made. Via the method, CSFB can be completed rapidly, and compared with the prior art, the CSFB time delay is reduced greatly, the success rate of CSFB calls is improved greatly, and the userexperience is improved.

Description

technical field [0001] The present invention relates to the technical field of wireless communication, in particular to a call implementation method, device and terminal for circuit domain fallback. Background technique [0002] As a subsequent evolution technology of 3G, LTE (Long Term Evolution) has unique technical advantages such as high data rate, low delay, and flexible bandwidth configuration. CSFB (Circuit Switched Fallback) refers to the technology that a terminal residing on the LTE network leaves the LTE network and returns to the 2 / 3G network to initiate a CS domain voice call due to the need for voice services. It has been widely used in the LTE network. [0003] Usually, a CSFB call mainly consists of three processes: the redirection process issued by the network falls back to 2 / 3G, the search for 2 / 3G network signal resides and reads system messages, and the voice call is made in the 2 / 3G network. Falling back to GSM as an example, combined with figure 1 , t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04W36/14H04W36/34
CPCH04W36/14H04W36/34
Inventor 阮航王小旭
Owner CHINA MOBILE COMM LTD RES INST
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