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Method and device for circuit domain fallback of a dual-card terminal, and terminal

A circuit domain fallback and terminal technology, which is applied in the communication field, can solve problems such as access failure, CSFB time extension, and inability to reside, so as to improve the success rate, shorten the fallback delay, and improve user experience.

Active Publication Date: 2022-03-22
ZTE CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

During the CSFB process, the terminal often fails to fall back to the cell redirected by the network. The terminal can only continue to search for other cells until it successfully resides in a cell and establishes a telephone service. This may cause a long CSFB delay
[0003] Related technologies have the following problems: the terminal falls back to the frequency point indicated by the network but cannot camp or fails to access, and the terminal needs to continue searching for other cells, which may lead to a long CSFB delay and affect user experience

Method used

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  • Method and device for circuit domain fallback of a dual-card terminal, and terminal
  • Method and device for circuit domain fallback of a dual-card terminal, and terminal
  • Method and device for circuit domain fallback of a dual-card terminal, and terminal

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] Such as figure 1 As shown, the methods for dual-card terminal CS domain fallback may include:

[0048] Step 101: When CSFB occurs on the first SIM card, make the following judgment on the second SIM card:

[0049] 1) The second SIM card currently resides in a 2G or 3G cell normally, and the serving cell of the second SIM card can provide circuit switched (CS, Circuit Switched) services.

[0050]2) The second SIM card and the first SIM card belong to the same operator, or the PLMN of the cell where the second SIM card is located is the RPLMN of the first SIM card, or the PLMN of the cell where the second SIM card is located exists in the RPLMN of the first SIM card EPLMN or EHPLMN list;

[0051] Step 102: When the second SIM card satisfies the two conditions at the same time, fall back the first SIM card to the current serving cell of the second SIM card.

[0052] Here, when the second SIM card cannot satisfy the two conditions at the same time, that is to say, the ab...

Embodiment 2

[0079] A dual-card terminal circuit domain fallback device, such as Figure 4 shown, including:

[0080] Judging module 41, used for judging whether the second SIM card satisfies the following two conditions when the circuit domain fallback occurs on the first SIM card:

[0081] The second SIM card currently normally resides in a 2G or 3G cell and the current serving cell of the second SIM card can provide circuit switched CS services;

[0082] The second SIM card and the first SIM card belong to the same operator, or the public land mobile network PLMN of the cell where the second SIM card is located is the registered public land mobile network RPLMN of the first SIM card, or the The PLMN of the cell where the second SIM card is located exists in the peer-to-peer public land mobile network EPLMN or equivalent home public land mobile network EHPLMN list of the first SIM card;

[0083] The execution module 42 is configured to drop the first SIM card back to the current servin...

Embodiment 3

[0098] A terminal such as Figure 5 shown, including:

[0099] the first SIM card 51;

[0100] second SIM card 52;

[0101] A memory 53 storing a dual-card terminal circuit domain fallback program;

[0102] The processor 54 is configured to execute the dual-card terminal circuit domain fallback program to perform the following operations: when a circuit domain fallback occurs on the first SIM card, determine whether the second SIM card meets the following two conditions: the second SIM card Currently normally camped in a 2G or 3G cell and the current serving cell of the second SIM card can provide circuit switched CS services; the second SIM card and the first SIM card belong to the same operator, or the second SIM card The public land mobile network PLMN of the cell where the card is located is the registered public land mobile network RPLMN of the first SIM card, or the PLMN of the cell where the second SIM card is located exists in the peer-to-peer public land mobile net...

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Abstract

This paper discloses a method, device, and terminal for circuit domain fallback of a dual-card terminal, including: when a circuit domain fallback occurs on the first SIM card, judging whether the second SIM card satisfies the following two conditions: the second SIM card is currently normal Residing in a 2G or 3G cell and the current serving cell of the second SIM card can provide CS services; the second SIM card and the first SIM card belong to the same operator, or the cell where the second SIM card is located The PLMN is the RPLMN of the first SIM card, or the PLMN of the cell where the second SIM card is located exists in the EPLMN or EHPLMN list of the first SIM card; when the second SIM card satisfies the two conditions at the same time , returning the first SIM card to the current serving cell of the second SIM card. The application can improve the success rate of the first cell selection of the dual-card terminal CSFB and shorten the fallback delay.

Description

technical field [0001] The present invention relates to the communication field, in particular to a method and device for circuit domain fallback of a dual-card terminal, and a terminal. Background technique [0002] Currently, CSFB (Circuit Switch Fallback) technology is a process that is often triggered when a terminal needs to perform telephone services in a Long Term Evolution (LTE, Long Term Evolution) network. During the CSFB process, the terminal often fails to fall back to the cell redirected by the network. The terminal can only continue to search for other cells until it successfully camps in a cell and establishes a telephone service, which may cause a long CSFB delay. [0003] The related technology has the following problems: the terminal falls back to the frequency point indicated by the network but cannot camp or fails to access, and the terminal needs to continue to search for other cells, which may cause a long CSFB delay and affect user experience. Conten...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04W36/00H04W36/08H04W36/14H04W36/30H04W88/06
CPCH04W36/0066H04W36/0088H04W36/08H04W36/14H04W36/30H04W88/06
Inventor 王亚南
Owner ZTE CORP