Method and mobile terminal for searching cell

A mobile terminal, cell search technology, applied in access restriction, electrical components, wireless communication and other directions, can solve the problems of long time in the initial cell search method, off-network, and small range of candidate search lists, etc., to achieve shortened time, The effect of improving efficiency and expanding range

Inactive Publication Date: 2009-12-09
HUAWEI DEVICE (SHENZHEN) CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, the cell search method in the prior art has a small range of candidate search lists, and in some application scenarios, it still cannot improve the efficiency of cell search.
[0006] For example, there are two adjacent cells with different frequencies, the first cell and the second cell. After the mobile terminal is successfully handed over from the first cell to the second cell, the mobile terminal loses synchronization on the second cell before the measurement control message is delivered. At this time, the second cell cannot know the neighbor cell information of the second cell of the mobile terminal through the measurement control message (Measurement Control), and the cell frequency and primary scrambling code of the first cell have been deleted from the candidate list of the mobile terminal. During the cell search process, the mobile terminal searches the candidate list, but only the frequency and primary scrambling code of the second cell are in the candidate search list, but the second cell cannot currently reside, which will cause the mobile terminal to be unable to search for the cell for a long time. Eventually lead to disconnection and have to search through the initial cell search method, and the initial cell search method usually takes a long time

Method used

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  • Method and mobile terminal for searching cell
  • Method and mobile terminal for searching cell
  • Method and mobile terminal for searching cell

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Experimental program
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specific Embodiment 1

[0020] The cells can be divided into: acceptable cells, resident cells, prohibited cells, and reserved cells.

[0021] An acceptable cell means that the user terminal can only obtain some limited and most basic services in the cell, for example, it can only make emergency calls. Cells that do not belong to prohibited cells and whose signal quality meets certain requirements can be considered as acceptable cells.

[0022] A cell that can be camped on means that the mobile terminal can obtain normal communication services in the cell, for example, it can make a voice call, send a short message, and so on. Not belonging to a prohibited cell, the signal quality meets certain requirements, the PLMN to which it belongs is the PLMN selected by the mobile terminal or the Equivalent Public Land Mobile Network (EPLMN for short), and the PLMN or EPLMN mentioned is not in the prohibited cell Within the routing location area, such a cell can be considered as a campable cell.

[0023] A f...

Embodiment 1

[0031] Such as figure 1 Shown is a flow chart of a cell search method according to an embodiment of the present invention, including:

[0032] Step 101, record the historical cell frequency into the candidate search list of the mobile terminal, the historical cell frequency is the frequency of the cell where the mobile terminal has camped and / or the frequency of a neighboring cell of the cell where the mobile terminal has camped;

[0033] Step 102: When the mobile terminal starts to search for a cell, if no cell that can be camped on can be found according to the frequency of the candidate cell in the candidate search list and the primary scrambling code, then search for a cell that can camp on according to the frequency of the historical cells in the candidate search list. district.

[0034] Specifically, in step 101, when the mobile terminal camps on a cell, record the frequency of the cell and its neighbors in the candidate search list, instead of recording the frequencies...

specific Embodiment 2

[0036] Such as figure 2 Shown is the flow chart of the cell search method in Embodiment 2 of the present invention, including:

[0037] Step 201, when the mobile terminal releases the connection in the CELL_DCH state, it starts to search for cells that can camp on from the candidate search list.

[0038] Step 202, read the frequency and primary scrambling code of a candidate cell from the candidate search list.

[0039]Step 203, the mobile terminal searches for a cell according to the read frequency and primary scrambling code of the candidate cell.

[0040] Step 204 , judging whether the searched cell can be camped on, if the searched cell is possible to camp on, then the mobile terminal chooses to camp on the currently searched cell, otherwise, executes step 205 .

[0041] Step 205 , judging whether there is a next candidate cell in the candidate search list, if yes, execute step 206 ; otherwise, execute step 207 .

[0042] Step 206, read the frequency and primary scramb...

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Abstract

The invention discloses a method and a mobile terminal for searching a cell. The method comprises the following steps: recording frequency of a historic cell in an alternate search list of the mobile terminal, wherein the historic cell frequency is frequency of a cell resided by the mobile terminal and/or frequency of a cell adjacent to the cell resided by the mobile terminal; and if no residing cell is searched according to the frequency of an alternate cell recorded in the alternate search list and a primary scrambling code, searching a residing cell according to the frequency of the historic cell in the alternate search list, wherein the alternate cell comprises the cell resided by the mobile terminal last time and/or the cell adjacent to the cell resided by the mobile terminal last time. The embodiment adds the frequency of the historic cell into the alternate search list, enlarges the searching range of the cell, can improve the searching efficiency of the cell and shorten the searching time of the cell.

Description

technical field [0001] The invention relates to mobile communication technology, in particular to a cell search method and a mobile terminal. Background technique [0002] Usually, the network search process of the mobile terminal is very short, and can be completed within a few seconds after the mobile terminal is turned on. The network search capability of a mobile terminal can be used as an important index to evaluate the quality of a mobile terminal. [0003] The network search process of a mobile terminal in a Wideband Code Division Multiple Access (WCDMA) network is usually to select a Public Land Mobile Network (PLMN) first when the mobile terminal is turned on or disconnected from the network. , and then search for cells belonging to the PLMN, and select a suitable cell to camp on. [0004] In order to shorten the subsequent cell search process, in the prior art, after initially searching for a suitable cell, the frequency and primary scrambling code (Primary Scram...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04W48/16H04W88/02
Inventor 刘音张强张轶湛杜霄鹏陈文峰陈功吴林森
Owner HUAWEI DEVICE (SHENZHEN) CO LTD
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