KR100617547B1 - Cell selection method of mobile communication terminal - Google Patents

Abstract

The present invention provides a cell selection method of a mobile communication terminal, comprising: a first step of storing cell removal information that can be acquired when a cell is selected by a terminal in a buffer; A second step of storing information of the buffer in a memory of the terminal when the power of the terminal is turned off after the first step; And a third step of lowering the ARFCN priority of the removed cell stored in the buffer or the memory when selecting the cell of the terminal after the second step, thereby removing previously stored when selecting a cell in the terminal. By setting the cell priority based on the information of the cell, the efficiency of the terminal operation can be improved and a quick service can be provided to the user.

Description

Method for cell selection of mobile station in mobile communication system

1 is a block diagram of a mobile communication terminal to which the present invention is applied;

2 is a flowchart illustrating a cell selection method of a mobile communication terminal according to the present invention;

3 is a conceptual diagram illustrating an example of storing cell information in a buffer and a memory according to the present invention.

Explanation of symbols on the main parts of the drawings

10: terminal 11: buffer

12 memory 13 control unit

The present invention relates to a cell selection method of a mobile communication terminal. In particular, when selecting a cell in the terminal, a cell priority is set based on information of a previously removed cell, thereby improving efficiency of a terminal operation and a user. The present invention relates to a cell selection method of a mobile communication terminal suitable for providing a fast service to a mobile station.

In the case of the conventional GSM terminal, a procedure for managing the Forbidden Public Land Mobile Network (PLMN) and the Forbidden Location Area Code (LAC) has been implemented.

The GSM terminal includes a SIM card (Subscriber Identify Module card) which is a kind of smart card. In order to make a GSM call, the SIM card is inserted and then the call is made. Therefore, the SIM card can be inserted into any phone and has the advantage.

In addition, PLMN is a European term used to refer to a GSM system and contains information necessary for cell rejection from a network when checking information of the terminal 40.

LAC also refers to a code that bundles multiple base stations and makes them available in one radius.

Thus, in the related art, after managing a Forbidden PLMN or a Forbidden LAC, the information is deleted after a specific time.

However, since the information is deleted after a certain time after managing the Forbidden PLMN / LAC in the prior art, after turning off the power of the terminal or after a specific time elapses, the base station corresponding to the Forbidden PLMN from the base station to the terminal The technology used for cell attempt in a subsequent cell selection procedure is not implemented by managing a BA (Broadcasting Control Channel (BACH) Allocation) list, which is cell information to be transmitted.

Therefore, the prior art has an inefficiency in the operation of the terminal because there is a limit in the cell priority setting, there was a limit in providing a fast service to the user.

Accordingly, the present invention has been proposed to solve the above-mentioned general problems, and an object of the present invention is to operate a terminal by setting a cell priority based on information of a previously stored cell when selecting a cell in the terminal. It is to provide a cell selection method of a mobile communication terminal that can improve the efficiency of the service and provide a quick service to the user.

In order to achieve the above object, the cell selection method of the mobile communication terminal according to an embodiment of the present invention,

A first step of storing, in a buffer, cell removal information that can be acquired when the cell is selected by the terminal; A second step of storing information of the buffer in a memory of the terminal when the power of the terminal is turned off after the first step; And a third step of lowering the ARFCN priority of the removed cell stored in the buffer or the memory when the cell is selected by the terminal after the second step.

Hereinafter, an embodiment of the present invention as described above, according to the spirit of the cell selection method of the mobile communication terminal will be described with reference to the drawings.

1 is a block diagram of a mobile communication terminal to which the present invention is applied.

Here, reference numeral 10 is a terminal used in a GSM system or the like, 11 is a buffer for temporarily storing information in the terminal 10, 12 is a memory for storing information of the terminal 10, 13 is The control unit manages the buffer 11 and the memory 12 and controls the operation of the terminal 10.

2 is a flowchart illustrating a cell selection method of a mobile communication terminal according to the present invention.

As shown therein, a first step (ST11) of storing cell removal information that can be learned when the cell is selected by the terminal 10 in the buffer 11; A second step (ST12) of storing the acquired cell removal information of the buffer (11) in the memory (12) of the terminal (10) when the terminal (10) is powered off after the first step; A third step of reducing the time required for cell selection by adjusting the priority of the removed cells stored in the buffer 11 or the memory 12 when selecting a cell of the terminal 10 after the second step ( ST13).

In the first step, the obtainable cell removal information may be configured to include one or more of a cell ARFCN, a mobile country code / mobile network code (MCC / MNC), and a BACH (BCCH Allocation) list of system information. It is done.

In the second step, the memory 12 is characterized by using a nonvolatile memory.

In the third step, the PLMN (Public Land Mobile Network) selected from the MM (Mobility Management) or RR (Radio Resource) in the power-on or no service of the terminal 10 is the memory 12 It is characterized in that the cell selection of the terminal 10 is performed by checking whether it is stored in the terminal.

In the third step, the cell is selected when the cell exists in the corresponding PLMN.

In the third step, it is characterized by adjusting the priority of the removed cells using Absolute Radio Frequency Channel Numbers (ARFCN).

The third step above is characterized by adjusting to give a lower ARFCN priority of the removed cell.

The operation of the cell selection method of the mobile communication terminal according to the present invention configured as described above will be described in detail with reference to the accompanying drawings.

First, the present invention is to set the cell priority based on the information of the previously stored removed cells when selecting a cell in the terminal.

Thus, the present invention is applicable to a terminal having a buffer 11 and its own memory 12 available in selecting a cell of the GSM terminal 10.

The terminal 10 stores the cell removal information that can be learned at the time of cell selection in the buffer 11. The cell removal information includes a cell ARFCN, MCC / MNC (Mobile Country Code / Mobile Network Code), and a list of system information (BA).

Cell Absolute Radio Frequency Channel Numbers (ARFCN) refers to a channel numbering scheme used to identify a designated RF channel of a GSM radio system.

Thus, when allocating spectrum for a mobile communication system, the radio channel is identified by the ARFCN. If the mobile communication system operates in the frequency division duplex (FDD) mode, the channel number is associated with a radio channel of uplink and downlink. In the case of GSM (Global System for Mobile communication) 900, ARFCN 1 ~ 124 is used, GSM1800 uses ARFCN 512 ~ 885, and GSM1900 uses ARFCN 512 ~ 810.

Mobile Country Code (MCC) is a country code for a mobile device. MCC operates in three digits.

MNC (Mobile Network Code) is a network code for a portable device.

The MNC, which identifies IMT-2000 carriers, also operates in two digits in Japan's existing mobile phones, Western GSM systems, and ANSI-41 (equivalent to Japan's CDMAOne).

The combination of MCC and MNC thus uniquely identifies the carrier.

In addition, when the power of the terminal 10 is turned off, the information of the buffer 11 is stored in the memory 12 of the terminal 10.

Then, when selecting a cell of the terminal 10, the ARFCN priority of the removed cell stored in the buffer 11 or the memory 12 is set to low to give a low value.

This will be described in more detail as follows.

1) First step

When the cell is selected, the MCC / MNC and BA list of the corresponding cell may be acquired through the ARFCN and system information of the removed cell, and the acquired information is stored in the buffer 11 of the terminal.

The stored information is stored up to n ARFCNs and m PLMNs per PLMN depending on whether the buffer 11 and the memory 12 are available.

In total, m * n ARFCNs are stored.

3 is a conceptual diagram illustrating an example of storing cell information in a buffer and a memory according to the present invention.

2) second stage

When the power is turned off, the information of the buffer 11 is stored in the memory 12 of the terminal 10 having no volatility so that it can be referred to later when turned on.

3) 3rd step

It is checked whether the PLMN selected in the MM (Mobility Management) or the RR (Radio Resource) in the power-on of the terminal 10 or No Service is stored in the memory 12.

In this case, the protocol of the GSM terminal 10 includes an MM stage, an RR stage, and a Layer 1 stage. In addition, the MM stage is connected to the network side to exchange network codes, perform routing (Routing), and send them to the RR stage. The RR stage receives the signal from the MM stage and sends the signal to the layer 1 stage, and performs radio resource management. In the first layer, protocol processing is performed in the physical layer.

Therefore, when a cell of the corresponding PLMN exists, the ARFCN priority of the corresponding cell is set to low when the cell is selected.

This can shorten the time required for cell selection.

As such, the present invention improves the efficiency of terminal operation and provides fast service to the user by setting cell priorities based on information of previously removed cells when selecting a cell in the terminal.

Although the preferred embodiment of the present invention has been described above, the present invention may use various changes, modifications, and equivalents. It is clear that the present invention can be applied in the same manner by appropriately modifying the above embodiments. Accordingly, the above description does not limit the scope of the invention as defined by the limitations of the following claims.

As described above, the cell selection method of the mobile communication terminal according to the present invention shortens the cell search time by preventing cell attempts to unnecessary cells based on information of previously stored cells when a cell selection situation occurs in the terminal. This improves the efficiency of the terminal operation and has the effect of providing a quick service to the user.

Claims (7)

A first step of storing, in a buffer, cell removal information that can be acquired when the cell is selected by the terminal; A second step of storing, in the memory of the terminal, the acquired cell removal information of the buffer when the terminal is powered off after the first step; And a third step of reducing the time required for cell selection by adjusting the priority of the removed cells stored in the buffer or the memory when the cell is selected by the terminal after the second step. Cell selection method of communication terminal. The method of claim 1, wherein the obtainable cell removal information in the first step is: Cell ARFCN, MCC / MNC, cell selection method of a mobile communication terminal, characterized in that it comprises a one or more of the BA list of information of the system. The method of claim 1, wherein the memory in the second step, A cell selection method of a mobile communication terminal, characterized by using a nonvolatile memory. The method of claim 1, wherein the third step, And performing cell selection of the terminal by checking whether the PLMN selected in the MM or RR in the power-on or no service of the terminal is stored in the memory. The method of claim 4, wherein the third step, The cell selection method of the mobile communication terminal, characterized in that for selecting a cell when the cell exists in the PLMN. 6. The method of claim 1, wherein the third step comprises: A cell selection method of a mobile communication terminal, characterized in that for adjusting the priority of the removed cell using the ARFCN. The method of claim 6, wherein the third step, And adjusting the ARFCN priority of the removed cell to a lower level.

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