KR100584444B1 - Method for selecting cell in multi mobile terminal - Google Patents

Abstract

The present invention provides a method for cell selection in a multi-band mobile communication terminal, comprising: a first step of searching for a received signal power of each cell if a service fails to be provided from a cell providing a service or if there is a roaming request; A second process of acquiring system information on a cell having the above-described reception power, and generating and databaseting an absolute frequency channel number list according to a band / public mobile network using the public mobile network information and neighbor cell information included in the system information. And a fourth process of performing camping on using the absolute frequency channel number list according to the database band / public mobile network. Therefore, the present invention allows the user to receive a fast service by reducing the camping on attempt time when changing the band / PLMN in the multi-band mobile communication terminal.

Multiband mobile communication terminal, cell selection, absolute frequency channel number list database

Description

Cell selection method of multi-band mobile communication terminal {METHOD FOR SELECTING CELL IN MULTI MOBILE TERMINAL}             

1 is a block diagram of a multi-band mobile communication terminal according to an embodiment of the present invention

2 is a flowchart illustrating a cell selection process of a multi-band mobile communication terminal according to an embodiment of the present invention.

3 illustrates an ARFCN list database according to an embodiment of the present invention.

The present invention relates to a multi-band mobile communication terminal, and more particularly, to a cell selection method of a multi-band mobile communication terminal.

Global System for Mobile Communication (GSM) is a digital mobile phone system classified as a 2'nd Generation (2G) cellular system and is widely used in Europe and elsewhere. GPRS (General Packet Radio Services), developed based on GSM, is a more advanced packet-based mobile communication service. It is a third generation (3G) for providing high quality voice and multimedia services. This is an evolutionary step towards mobile communication systems, especially UMTS (Universal Mobile Telecommunication System). UMTS is based on the GSM communications standard, but uses wide band, Code Division Multiple Access (CDMA) technology, and provides packet-based text, digitized voice or video and mobile phone or computer users anywhere in the world. It provides a service that can transmit multimedia data at high speed of 2Mbps or more. The UMTS uses the concept of a virtual connection called a packet-switched connection using a packet protocol such as the Internet Protocol (IP), and is always accessible to any other end point in the network. Mobile communication technology will evolve from 2G (2'nd Generation) cellular systems, especially GSM / GPRS to 3G (3G) mobile communication systems, especially UMTS. But the transition from 2G to 3G will be gradual over the years, for quite some time. This allows the network operator to work with both technologies, namely GSM / GPRS and UMTS, and to provide the user with a mobile terminal that can also work with IS-95B, IS 95-C, IMT-2000, etc. I felt the need to do it. Accordingly, recently, multi-band mobile communication terminals capable of operating in various communication technologies such as GSM / GPRS and UMTS, IS-95B, IS 95-C, and IMT-2000 have been developed and used.

However, such a multi-band mobile communication terminal takes a long time because roaming or missing a frequency in the weak field requires cell search for each band. For example, if there are five cells belonging to one frequency band (GSM) and three cells belonging to another frequency band (UMTS), the multi-band mobile communication terminal needs to search a total of eight cells. It takes much more time than searching.

As such, when the cell search takes a long time, the multi-band mobile communication terminal may not perform camping on quickly. That is, there is a disadvantage in that cell selection cannot be performed quickly. If the cell selection is not made quickly, the user may feel uncomfortable because the waiting time for the service is long.

Accordingly, an object of the present invention is to provide a method in a multiband mobile communication terminal which performs camping on quickly by shortening a cell search time in a multiband mobile communication terminal.

Another object of the present invention is to database each of the list of Absolute Radio Frequency Channel Number (ARFCN) according to each PLMN (Public Land Mobile Network) information and band information during cell search, each database It is to provide a method for quickly camping on using the ARFCN list.

According to the above object, in the cell selection method of the multi-band mobile communication terminal, a first process of failing to receive service from a cell providing a service or searching for a received signal power of each cell when there is a roaming request; And a second process of acquiring system information on a cell having a reception power greater than or equal to a predetermined value as a result of the search, and an absolute frequency channel according to a band / public mobile network using public mobile network information and neighbor cell information included in the system information. And a fourth step of generating a number list and making a database, and a fourth step of performing camping on using the absolute frequency channel number list according to the band / public mobile network.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. It should be noted that the same elements in the figures are represented by the same numerals wherever possible. In addition, detailed descriptions of well-known functions and configurations that may unnecessarily obscure the subject matter of the present invention will be omitted.

A multi-band mobile communication terminal often receives a mobile communication service from a predetermined cell, but misses a frequency in a weak electric field, and receives a service from a cell providing a service, or selects a cell and camps on again when there is a roaming request. However, the conventional multi-band mobile communication terminal has a disadvantage in that the cell reselection time is long and the camping on time is long because the cells for each band must be searched (search). In order to solve such a problem, the multi-band mobile communication terminal of the present invention makes a database of ARFCN lists according to PLMN information and band information of each cell during cell search, and does not receive service from a cell providing a service, or roaming. When requested, the camper can be quickly turned on using the database-based ARFCN list. Accordingly, the multi-band mobile communication terminal of the present invention reduces the cell selection time when the band / PLMN is changed so that the user can be provided with a fast service.

Hereinafter, the configuration and operation of a multi-band mobile communication terminal according to an embodiment of the present invention will be described. 1 is a block diagram of a multi-band mobile communication terminal according to an embodiment of the present invention. 1, a multi-band mobile communication terminal according to an embodiment of the present invention, the control unit 102, the multi-band transceiver 104, the first signal processor 106, the second signal processor 108, the third The signal processor 110 and the memory 112 are configured.

The control unit 102 controls the overall operation of the multi-band mobile communication terminal and receives a mobile communication service by selecting a predetermined cell and fails to receive the service from the cell providing the service, or if there is a roaming request, the received signal power of each cell. Navigate. The controller 102 searches for received signal power to obtain system information on a cell having a received power of a predetermined value or more, and to database the ARFCN list according to the PLMN information and the band information of the acquired system information. The control unit 102 selects a cell using the database ARFCN list, and camps on the selected cell.

The multi-band transmitter / receiver 104 separates the received signals of the first, second, and third bands received through the antenna, respectively, so that the first signal processor 106, the second signal processor 108, and the third signal processor ( Output to 110). In addition, the multi-band transceiver 104 may transmit the first, second, and third band transmission signals received from each of the first signal processor 106, the second signal processor 108, and the third signal processor 110. Output to the outside through. At this time, the antenna is preferably a multi-band antenna that can transmit and receive three bands.

The first signal processor 106 processes transmit and receive signals of the first band under the control of the controller 102, the second signal processor 108 processes transmit and receive signals of the second band, and the third signal processor 110. Processes the transmit / receive signal of the third band. The first, second, and third bands may be different bands, for example, GSM, DCS, or PCS bands.

The memory 112 may be configured as a non-volatile memory that can be electrically read / write, etc., and stores the ARFCN list databased by the controller 102.

2 is a flowchart illustrating a camping-on process of a multi-band mobile communication terminal according to an embodiment of the present invention, and FIG. 3 is a diagram illustrating an ARFCN list database according to an embodiment of the present invention.

1 through 3, a multi-band mobile communication terminal according to an embodiment of the present invention generates and databases an ARFCN list according to PLMN information and band information of each cell and selects a cell using the ARFCN list. It will be described in detail.

The control unit 102 fails to receive the service from the cell providing the service in step 22, or proceeds to step 24 if there is a roaming request. The control unit 102 searches for the received signal power of each cell in step 24. That is, the control unit 102 measures the reception power of the broadcast control channel (BCCH) signal broadcast from each cell. BCCH is a point-to-multi point downlink unidirectional channel used to notify cell information to each terminal and includes system information of the corresponding cell.

After searching for the received signal power of each cell, the controller 102 acquires system information about a cell having a received power of a predetermined value or more in step 26. That is, the controller 102 obtains system information of a corresponding cell from a BCCH signal having a reception power of a predetermined value or more. The system information includes PLMN information and neighbor cell information of the corresponding cell. The control unit 102 generates and databases an ARFCN list according to a band / PLMN using PLMN information and neighbor cell information of system information in step 28. That is, the controller 102 generates a list of ARFCNs having a reception power of a predetermined value or more for each band / PLMN type, and makes a database.

3 is a diagram illustrating an ARFCN list for each band / PLMN database according to an embodiment of the present invention. Referring to FIG. 3, the ARFCN list according to GSM band / PLMN A is 1,2,3,4,6,7,10,20,30,40,50, and the ARFCN list according to GSM band / PLMN B is 60. , 61,62,63,70,80,82,83,84,90. The ARFCN list according to DCS band / PLMN C is 512,513,514,515,589,590,600,601 and the ARFCN list according to PCS band / PLMN D is 512,513,514,515,590,610,620,630. As described above, the control unit 102 generates a list of ARFCNs having a reception strength of a predetermined value or more for each band / PLMN and forms a database.

The control unit 102 performs camping on using the ARFCN list according to the band / PLMN databased as described above in step 30. Hereinafter, the process of step 30 will be described in more detail as an example. When the PLMN A is used, the control unit 102 receives each cell when there is a change in the electric field or when the PLMN needs to be changed by the user or when there is no suitable neighboring cell. Search for signal power. The controller 102 obtains band information and ARFCN information from a signal having a reception power of a predetermined value or more. Then, the control unit 102 reads the ARFCN list for PLMN A from the ARFCN list for each band / PLMN type previously databased, and assigns the ARFCN to the ARFCN corresponding to the GSM / PLMN A databased in advance. First try camping. For example, band information and ARFCN information obtained by receiving signal power search are 1,2,3,4,6,7,8,9,10,15,17,20,30,40,50,60,61,62 , 63, 70, 80, 82, 83, 84, 90, 512 (DCS), 513 (PCS), 589 (DCS), 600 (DCS), 601 (DCS), 630 (PCS) As shown in FIG. 3, first, camping attempts are made for ARFCNs 1,2,3,4,6,7,10,20,30,40,50 corresponding to GSM / PLMN A. However, if camping on is not successful after attempting to camp on ARFCN corresponding to PLMN A, the controller 102 attempts to camp on ARFCN of the remaining PLMN except PLMN A. Therefore, since the control unit 102 first attempts to camp on the ARFCN having a high probability of successful camping, the camping on can be performed much faster.

In the above description of the present invention, specific embodiments have been described, but various modifications may be made without departing from the scope of the present invention. Therefore, the scope of the present invention should not be defined by the described embodiments, but should be determined by the equivalent of claims and claims.

As described above, the present invention provides a database of ARFCN lists according to PLMN information and band information of each cell when a cell is searched in a multi-band mobile communication terminal, and does not receive a service from a cell providing a service or a roaming request. Camping on is performed quickly by using databaseized ARFCN list. Accordingly, the multi-band mobile communication terminal of the present invention reduces the cell selection time when the band / PLMN is changed so that the user can be provided with a fast service.

Claims (3)

In the cell selection method in a multi-band mobile communication terminal, A first process of searching for a received signal power of each cell if a service fails to be provided from a cell providing a service or there is a roaming request; A second process of acquiring system information on a cell having a reception power of a predetermined value or more as a result of the search; A third process of generating and databaseting an absolute frequency channel number list for each type according to band information and public mobile network information using the public mobile network information and neighbor cell information included in the system information; And a fourth process of performing camping on using the absolute frequency channel number list. The method of claim 1, wherein the fourth process is A first step of searching for received signal power of each cell if the service fails to be provided while receiving a service from a specific public mobile network or if there is a roaming request; A second step of acquiring absolute frequency channel number information for each band from a signal having a received power equal to or greater than a predetermined value as a result of the received signal power search of the first step; A third step of reading the absolute frequency channel number list; And performing a camping-on attempt on the absolute frequency channel number corresponding to a specific air mobile network in the absolute frequency channel number list among the obtained absolute frequency channel number information for each band. The method of claim 2, If the camping on is not successful after attempting to camp on the absolute frequency channel number corresponding to the specific air mobile network, a fifth step of attempting to camp on the absolute frequency channel number corresponding to the remaining air mobile network except for the specific air mobile network is further performed. Method characterized by including

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