JP2008259057A - Mobile communication terminal and terminal control method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent call incoming to a mobile communication terminal from being disabled. <P>SOLUTION: A mobile communication terminal 10 comprises: a cell shift detecting section 12a for detecting a cell-shift of the terminal itself; a notification information receiving section 12b for receiving, in notification information of a cell that is a shift destination, an SIB 1 that is notification information constitutive data common for the unit of a group of cells, containing CN domain information of the relevant cell when the cell shift is detected; and a location registration control section 12c for judging whether to perform location registration at the cell of the shift destination on the basis of the CN domain information contained in the received SIB 1. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a mobile communication terminal and a terminal control method in the mobile communication terminal.

  A mobile communication terminal such as a mobile phone receives broadcast information from a destination base station when moving between radio wave reachable areas (hereinafter referred to as “cells”) from one base station. The broadcast information is information regarding cells that are candidates for the migration destination.

  In a mobile communication network, information common to cell group units and cell units is managed as broadcast information, and is notified to mobile communication terminals at regular intervals. Here, the cell group is a set of cells set for management in the mobile communication network. Moreover, the change content of the broadcast information for each cell is managed by information (for example, value-tag in a W-CDMA (Wideband Code Division Multiple Access) system) that can determine whether the broadcast information has been changed.

  In the W-CDMA system, broadcast information includes information such as one MIB (Master Information Block) and a plurality of SIBs (System Information Blocks). Here, MIB is information for determining the SIB configuration and broadcast information change, SIB1 is common information for each group of cells, and SIB2 to 16 are common information for each cell. The MIB is a PLMN value-tag that is information for determining whether or not the data content of the SIB1 is changed, and a Cell value- that is information for determining whether or not the data content of the SIB2 to 16 is changed. Contains tag.

  The mobile communication terminal selects a migration destination cell based on the broadcast information received in the migration destination candidate cell, and performs cell migration. The determination of whether the cell being located is different from the migration destination candidate cell is performed by comparing the cell specifying information. If there is even one piece of different information, it is determined that the cell is different. In the W-CDMA system, for example, a scrambling code, an FID (Frequency Identifier), and a Cell ID are used as cell identification information. Cell ID is data assigned to each cell in order to identify a cell to which broadcast information is transmitted. Since the cell ID is information included in SIB3, whether the cell is the same after receiving the broadcast information. Judgment needs to be made.

  When the value-tag value included in the broadcast information received in the migration destination candidate cell is different from the value in the migration source cell, the cell unit corresponding to the corresponding value-tag and the cell unit common Since the information has changed, the mobile communication terminal needs to acquire the corresponding broadcast information.

Also, broadcast information that is common information for each cell group and each cell acquired in the mobile communication terminal is stored in association with the cell identification information of the cell. When the broadcast information has already been received and stored, the stored broadcast information is reused, so that new acquisition of broadcast information becomes unnecessary. Technologies relating to these processes are disclosed in, for example, Patent Documents 1 and 2.
JP 2003-153324 A JP 2004-112148 A

  In the prior art, when a value-tag (for example, PLMN value-tag) related to a group unit of a cell included in broadcast information changes between a cell migration source and a migration destination, the mobile communication terminal (For example, SIB1). Depending on the cell configuration of the mobile communication network, there is no change in the common information for each cell unit at the cell migration source and the migration destination, but only the common information for each cell group may be changed. The PLMN value-tag related to the cell group unit also changes.

  However, the PLMN value-tag may not change when only specific information among a plurality of pieces of information constituting the common information for each group of cells is changed. For example, in the W-CDMA system, there are the following cases. In the W-CDMA system, SIB1, which is broadcast information related to common information in units of cells, includes NAS (Non Access Stratum) system information, CN (CoreNetwork) domain information, timer / counter values in the Idle / Cell_DCH state, etc. It is comprised by. However, when only the CN domain information that is information indicating the location registration area is different between the cell migration source and the migration destination, and other common information is the same, the PLMN value-tag is the same. Here, the location registration area is an area (a set of cells) covered by the same location registration.

  This is because on the mobile communication network side, broadcast information may be set in a plurality of devices such as a plurality of RNCs (Radio Network Controllers) and may not be managed uniquely. The above includes cases where the RNC vendors are different. Furthermore, there is a possibility that the setting error of the station data is the cause.

  The mobile communication terminal needs to determine whether the common information has changed by acquiring the value-tag included in the broadcast information in the migration destination candidate cell. However, when the PLMN value-tag regarding the cell group unit is the same as described above, the mobile communication terminal can determine that the broadcast information (SIB1) common to the cell group unit is different. As a result, the notification information could not be acquired.

  By the way, when the mobile communication terminal moves from cell to cell, if it is detected that the CN domain information included in the broadcast information (SIB1) common to the cell group units is different, it is necessary to perform location registration. However, when the mobile communication terminal moves from cell to cell, if the PLMN value-tag related to the cell group unit is the same, the broadcast information (SIB1) common to the cell group unit is not acquired as described above. The communication terminal could not judge the difference in CN domain information. For this reason, even when location registration is required, location registration is not performed, and as a result, there are cases where incoming calls cannot be made under the corresponding cell.

  The present invention has been made in order to solve the above-described problems, and is capable of preventing a mobile communication terminal that performs communication via the mobile communication network as described above from being disabled from receiving an incoming call. An object is to provide a communication terminal and a terminal control method.

  In order to achieve the above object, a mobile communication terminal according to the present invention includes a cell transition detection unit that detects that the terminal itself has transitioned into a cell, and a transition destination when cell transition is detected by the cell transition detection unit Included in the broadcast information received by the broadcast information receiving means, and broadcast information receiving means for receiving broadcast information common to the cell group unit, including information indicating the location registration area of the cell. And location registration control means for determining whether or not to perform location registration in the migration destination cell based on information indicating the location registration area to be transferred.

  In the mobile communication terminal according to the present invention, triggered by cell transition, broadcast information common to cell group units, including information indicating a cell location registration area, such as CN domain information, is received. Accordingly, since only the location registration area is different before and after the cell transition, it is possible to determine the difference in information indicating the location registration area of the cell even when the information for determining the change of the broadcast information is not different. Based on this determination, location registration is performed in the corresponding cell, so that it is possible to receive a call even in a cell that has conventionally been disabled.

  The broadcast information received by the broadcast information receiving means is associated with cell specifying information for specifying the cell from which the broadcast information is received, and is used to perform at least one of location registration and communication in the destination cell. A storage means for storing the received information, and the broadcast information receiving means acquires cell specifying information for specifying the destination cell, and the acquired cell specifying information is not included in the information stored by the storing means. It is desirable to receive broadcast information of the destination cell.

  According to this configuration, the broadcast information of the cell received by the mobile communication terminal is stored in association with the cell specifying information. Therefore, when a cell that has already received and stored cell broadcast information has been received, the broadcast information is received as information used to perform location registration and / or communication in the destination cell. Is no longer necessary. Note that the information used for performing the location registration here may include information used for the determination by the location registration control means. This eliminates the use of a data reception channel for receiving the broadcast information, and can reduce power consumption in the mobile communication terminal.

  By the way, the present invention can be described as an invention of a mobile communication terminal as described above, and can also be described as an invention of a terminal control method as follows. This is substantially the same invention only in different categories, and has the same operations and effects.

  That is, the terminal control method according to the present invention is a terminal control method in a mobile communication terminal, in which when a cell transition is detected in a cell transition detection step for detecting that the terminal itself moves into a cell, The broadcast information reception step for receiving broadcast information common to the cell group unit, including the information indicating the location registration area of the cell, among the broadcast information of the destination cell, and the broadcast information reception step. And a location registration control step of determining whether to perform location registration in the migration destination cell based on information indicating a location registration area included in the broadcast information.

  In the present invention, since only the location registration area is different before and after the cell transition, it is possible to determine the difference in information indicating the location registration area of the cell even when the information for determining the change of the broadcast information is not different. Become. As a result, according to the present invention, location registration is performed in the corresponding cell, so that it is possible to receive a call even in a cell that has conventionally been disabled.

  Hereinafter, preferred embodiments of a mobile communication terminal and a terminal transition control method according to the present invention will be described in detail with reference to the drawings. In the description of the drawings, the same elements are denoted by the same reference numerals, and redundant description is omitted.

  Broadcast information will be described as a premise of the configuration and operation of the present embodiment described below. The broadcast information is composed of a plurality of data, and is transmitted from the base station in units of the data. Hereinafter, in order to clearly distinguish individual data as constituent elements of the broadcast information and the aggregate, the former is referred to as “broadcast information configuration data” and the latter is referred to as “broadcast information”. In the present embodiment, a W-CDMA system will be mainly described as an example. In the W-CDMA system, broadcast information is composed of MIB and SIB 1 to 16.

  FIG. 1 shows an overall configuration of a mobile communication system 1 including a mobile communication terminal 10 according to the present embodiment, and a configuration of the mobile communication terminal 10. Specifically, the mobile communication terminal 10 corresponds to a mobile phone that can perform mobile communication using a W-CDMA system. As shown in FIG. 1, in the mobile communication system 1, the mobile communication terminal 10 is connected so as to be able to communicate with one of the base stations 20 included in the mobile communication system 1 via a wireless communication line. To perform mobile communication. The base station 20 is a well-known base station that uses a cell corresponding to each base station as a communication area. The mobile communication system 1 includes a plurality of base stations 20.

  As described above, broadcast information (broadcast signal) including a plurality of broadcast information configuration data is transmitted from the base station 20. The broadcast information configuration data is periodically transmitted at regular intervals according to the type according to the determined schedule. FIG. 2 shows a schedule for transmitting the broadcast information configuration data. The horizontal and vertical axes in FIG. 2 indicate the time axis (unit is ms).

  In the W-CDMA system, for example, the MIB of the broadcast information configuration data is transmitted at 80 ms intervals such as 0 ms, 80 ms, 160 ms, and 240 ms after the reference time. Further, the MIB includes data such as a carrier code, a value-tag, and schedule information indicating a transmission schedule of each SIB. The value-tag is data for determining whether or not the data content of the broadcast information configuration data (each SIB) has been changed. The value-tag for determining whether or not the data content of SIB1 has been changed is a PLMN value-tag, and the value-tag for determining whether or not the data content of SIB2 to 16 has been changed is Cell value- It is a tag. The value-tag is set according to each broadcast information configuration data of the cell. If the value-tag is different before and after the cell transition, the broadcast information configuration data corresponding to the value-tag Judged to be different before and after migration.

  Of the broadcast information configuration data, SIB1 is broadcast information (configuration data) common to cell group units, and includes CN domain information that is information indicating a cell location registration area. The CN domain information is configured by a LAC (Location Area Code) and a RAC (Routing Area Code), and indicates a code assigned to each area in order to identify the location registered area. SIB1 is transmitted at an interval of 1280 ms, such as after 380 ms (from a reference time) and after 1660 ms.

  Of the broadcast information configuration data, SIB2 to 16 are broadcast information (configuration data) in units of cells. Among them, the SIB3 is transmitted at regular intervals such as 640 ms and includes a Cell ID. Cell ID is data assigned to each cell in order to identify a cell to which broadcast information is transmitted. Each of the SIBs 2 to 16 includes information for the mobile communication terminal 10 to perform location registration and communication in the cell.

  When the mobile communication terminal 10 moves to a cell, the mobile communication terminal 10 first determines whether or not the MIB of the broadcast information configuration data has been received and the data content of each SIB included in the MIB has been changed. Information to be discriminated is referred to, and an SIB as required is received.

  Subsequently, a detailed configuration of the mobile communication terminal 10 will be described. As shown in FIG. 1, the mobile communication terminal 10 includes a transmission / reception unit 11, a control unit 12, and a storage unit 13 as functional components.

  The transmission / reception unit 11 is connected to an antenna and is means for transmitting / receiving radio waves for mobile communication with the base station 20. The transmission / reception unit 11 also performs conversion between communication data and radio waves.

  The control unit 12 is connected to the transmission / reception unit 11 and the storage unit 13 and is means for controlling and executing the mobile communication function of the mobile communication terminal 10. In the mobile communication terminal 10, there are cell transition and location registration as mobile communication functions controlled by the control unit 12. The cell migration process indicates that the cell used by the mobile communication terminal 10 changes as a result of the mobile communication terminal 10 switching the base station 20 that is the communication partner. The switching of the base station 20 includes not only switching to the base station 20 configured as a separate body but also a communication method (used frequency band, modulation / demodulation method, codec decoding method, etc.) in communication with the same base station 20. Includes switching.

  The location registration process refers to the mobile communication terminal 10 notifying the mobile communication network of the CN domain information (LAC, RAC) included in the broadcast information (SIB1). The mobile communication terminal 10 performs the above notification to the mobile communication network immediately after the power is turned on and when the CN domain information in the cell after the cell transition process is different from that before the cell transition.

  Moreover, the control part 12 is comprised including the cell transition detection part 12a, the alerting | reporting information receiving part 12b, and the location registration control part 12c as a component which concerns on this invention.

  The cell transition detection unit 12a is a cell transition detection unit that detects that the own terminal 10 has performed a cell transition. The cell transition detection unit 12a detects the cell transition by monitoring the operation of the control unit 12. When the cell transition detection unit 12a detects that the terminal 10 has transitioned to the cell, the cell transition detection unit 12a notifies the broadcast information reception unit 12b of that fact.

  The broadcast information receiving unit 12b is means for receiving broadcast information of a cell transition destination cell (a cell selected as a transition destination). That is, the broadcast information receiving unit 12b is broadcast information receiving means for receiving at least SIB1 in the broadcast information of the destination cell when cell transition is detected by the cell transition detection unit 12a. The broadcast information is received via the transmission / reception unit 11. The broadcast information receiving unit 12b outputs the received SIB1 to the location registration control unit 12c. In the conventional mobile communication terminal, SIB1 is not received unless the PLMN value-tag included in the MIB differs between before and after the cell transition. Also, the broadcast information other than SIB1 is used by the control unit 12 as information for performing location registration and communication in the migration destination cell.

  Also, the broadcast information receiving unit 12b outputs the received broadcast information to the storage unit 13 in association with cell specifying information for specifying a cell (destination) from which the broadcast information is received. When the cell transition is detected by the cell transition detection unit 12a, the broadcast information receiving unit 12b acquires cell specifying information for specifying the destination cell as described later, and the acquired cell specifying information is stored in the storage unit. It is good also as receiving alerting | reporting information only when it is not contained in the information memorize | stored by 13. FIG. In that case, the broadcast information receiving unit 12b outputs the cell specifying information to the location registration control unit 12c.

  Here, the cell specifying information for specifying a cell corresponds to a scrambling code, a Cell value-tag, and a Cell ID. Here, the scrambling code is an identification code of the sector constituting the cell, and can be obtained by receiving from the base station 20. Further, as described above, the Cell value-tag can be acquired from the MIB in the broadcast information, and the CellID can be acquired from the SIB3.

  The location registration control unit 12c is a means for controlling location registration of the terminal 10 with respect to the mobile communication network. Specifically, the location registration control unit 12c is a location registration control unit that determines whether to perform location registration in the destination cell based on the CN domain information included in the SIB1 received by the broadcast information receiving unit 12b. . In this determination, if the CN domain information included in the SIB1 received by the broadcast information receiving unit 12b matches the CN domain information in the cell before transition, it is determined that location registration is not performed, and the cell before transition is determined. If it is not coincident with the CN domain information in FIG. The location registration control unit 12c holds the CN domain information of the cell in which the location registration is made in order to make the above determination.

  The location registration control unit 12c is acquired by the broadcast information receiving unit 12b when cell shift is detected by the cell shift detection unit 12a but SIB1 is not received by the broadcast information receiving unit 12b as described above. It is determined whether or not to perform location registration based on the CN domain information included in the SIB1 stored in the storage unit 13 and associated with the cell specific information. When the notification information receiving unit 12b determines to perform location registration, the notification information receiving unit 12b instructs the control unit 12 to perform location registration processing, and the control unit 12 performs location registration.

  The storage unit 13 is a storage unit that stores the broadcast information (broadcast information configuration data) input from the broadcast information receiving unit 12b in association with the cell identification information of the cell from which the broadcast information is received. Here, the broadcast information (broadcast information configuration data) is information used for performing location registration and communication by the control unit 12 in the cell, and specifically corresponds to SIB1 to SIB16. However, the notification information configuration data stored in the storage unit 13 is not necessarily used for both location registration and communication, and may be used for either one. The broadcast information configuration data stored in the storage unit 13 may also include information (SIB1 including CN domain information) used for determination of location registration by the location registration control unit 12c.

  The storage unit 13 stores the cell specifying information in the cell information storage table 13a and the notification information in the notification information storage area 13b. FIG. 3 shows an example of the cell information storage table 13a. As shown in FIG. 3, the cell information storage table 13a includes a scrambling code storage area 131, a value-tag storage area 132, and a Cell ID storage area 133, and is cell identification information input from the broadcast information receiving unit 12b. The scrambling code, cell value-tag, and cell ID data are stored in association with each other. Note that the data example in FIG. 3 shows a state in which cell identification information for the four left cells 30a to 30d is stored in an example of the cell configuration shown in FIG. Also, the broadcast information storage area 13b has an area for storing broadcast information configuration data of SIB1 to 16 in association with the scrambling code, Cell value-tag, and Cell ID. That is, the broadcast information storage area 13b stores broadcast information configuration data so that it can be acquired based on the cell identification information. The above is the functional configuration of the mobile communication terminal 10 according to the present embodiment.

  FIG. 4 shows a hardware configuration of the mobile communication terminal 10 according to the present embodiment. As shown in FIG. 4, a mobile communication terminal 10 includes a CPU (Central Processing Unit) 101, a RAM (Random Access Memory) 102, a ROM (Read Only Memory) 103, an operation unit 104, a wireless communication unit 105, a display 106, and an antenna 107. It is comprised by the hardware of these. In addition, the mobile communication terminal 10 has components (not shown) such as a voice processing unit, a speaker, and a microphone for functioning as a mobile phone. These components are connected so that various signals can be input and output via a bus. The functions described above are exhibited by the operation of these components.

  Subsequently, processing (terminal control method) executed by the mobile communication terminal 10 of the present embodiment will be described using the flowchart of FIG. This process is performed when the mobile communication terminal 10 performs cell transition, for example, when a user carrying the mobile communication terminal 10 moves.

  First, in the mobile communication terminal 10, the control unit 12 measures the reception level of the radio wave related to the broadcast information transmitted from the base station 20, and selects a migration destination candidate cell based on the reception level. At this time, the cell transition detection unit 12a detects that the cell transition is performed (S11, cell transition detection step). The cell transition detection unit 12a notifies the broadcast information reception unit 12b that the cell transition is performed.

  Subsequently, a scrambling code is acquired by the broadcast information receiving unit 12b (S12). The scrambling code is acquired by receiving a scrambling code from the base station 20 whose communication area is the cell selected by the control unit 12, and outputting the received scrambling code from the control unit 12 to the broadcast information receiving unit 12b. Is done. Subsequently, the broadcast information receiving unit 12b determines whether the same scrambling code as the scrambling code is stored in the cell information storage table 13a of the storage unit 13 (S13).

  When the same scrambling code is stored, the broadcast information receiving unit 12b receives the MIB from the base station 20 having the selected cell as the communication area (S14). On the other hand, if the same scrambling code is not stored, the process proceeds to S24 and later.

  After the MIB is received by the broadcast information receiving unit 12b, a cell value-tag is extracted and acquired from the MIB by the broadcast information receiving unit 12b. Subsequently, the broadcast information receiving unit 12b determines whether the same Cellvalue-tag as the acquired Cell value-tag is stored in the cell information storage table 13a of the storage unit 13 (S15).

  When the same Cell value-tag is stored, the broadcast information receiving unit 12b receives SIB3 from the base station 20 having the selected cell as a communication area (S16). On the other hand, if the same Cell value-tag is not stored, the process proceeds to S24 and later. At this time, SIB1 to be acquired in S24 may be received simultaneously. This is to suppress power consumption at the time of receiving the broadcast information configuration data in S24 as much as possible.

  After the SIB3 is received by the broadcast information receiving unit 12b, the cell ID is extracted from the SIB3 and acquired by the broadcast information receiving unit 12b. Subsequently, the broadcast information receiving unit 12b determines whether the same Cell ID as the acquired Cell ID is stored in the cell information storage table 13a of the storage unit 13 (S17).

  When the same Cell ID is stored, broadcast information of SIBs 1 to 16 stored in the broadcast information storage area 13b as broadcast information (configuration data) of the cell selected in S11 by the broadcast information receiving unit 12b. It is determined that the configuration data can be used. That is, when cell information of the destination cell is included in the information stored in the storage unit 13 by the notification information receiving unit 12b, the notification information (configuration data) stored in the storage unit 13 is used. Broadcast information of cells other than the above is not received.

  In that case, SIB1 memorize | stored in the memory | storage part 13 or SIB1 received by the alerting | reporting information receiving part 12b (when SIB1 is received in S16) is acquired by the location registration control part 12c. Moreover, each SIB which is alerting | reporting information structure data memorize | stored in the memory | storage part 13 is acquired by the control part 12 as alerting | reporting information structure data for performing position registration and communication in the cell selected as a transfer destination ( S18). When each SIB memorize | stored in the memory | storage part 13 is acquired, each SIB which concerns on the cell specified by each cell specific information is acquired based on said each cell specific information. A part of each SIB used by the control unit 12 may use the SIB received by the broadcast information receiving unit 12b.

  On the other hand, if the same Cell ID is not stored, the process proceeds to S24 described below. As described above, when it is determined that any one of the cell specifying information is not stored in the cell information storage table 13a of the storage unit 13, broadcast information configuration data that has not been received by the broadcast information receiving unit 12b is received. (S24, notification information receiving step). Here, the received broadcast information configuration data includes SIB1, which is broadcast information configuration data common to cell groups. That is, in the mobile communication terminal 10, when cell transition is detected, SIB1, which is broadcast information configuration data common to cell group units, including CN domain information is received. If SIB1 has already been received in S17, SIB1 is not received again (in this case, S17 is a notification information receiving step).

  Subsequently, the broadcast information received by the broadcast information receiving unit 12b is output to the storage unit 13 in association with the cell specifying information for specifying the cell from which the broadcast information is received, and stored in the storage unit 13 ( S25, storage step). At the same time, the SIB1 received from the notification information receiving unit 12b to the location registration control unit 12c is output. Also, each received SIB is output from the broadcast information receiving unit 12b to the control unit 12 as broadcast information configuration data for performing location registration and communication in the cell selected as the migration destination.

  Subsequently, the process (S25) in which the cell specifying information and the notification information are stored in the storage unit 13 will be described in more detail with reference to the flowchart of FIG. First, the scrambling code received in S12 is stored in the scrambling code storage area 131 of the cell information storage table 13a in the storage unit 13 (S251, storage step). Subsequently, the Cell value-tag extracted from the MIB received in S14 is stored in the value-tag storage area 132 of the cell information storage table 13a in the storage unit 13 in association with the scrambling code ( S252, storage step).

  Subsequently, the Cell ID extracted from the SIB3 received in S16 is stored in the Cell ID storage area 133 of the cell information storage table 13a in the storage unit 13 in association with the scrambling code and the Cell value-tag. (S253, storage step). Subsequently, in the broadcast information storage area 13b in the storage unit 13, each SIB that is broadcast information configuration data received in S24 is stored in the scrambling code, Cell value-tag, and Cell ID stored in the cell information storage table 13a. Stored in association with each other (S254, storage step). The SIB stored in the broadcast information storage area 13b may include SIB1.

  Next, returning to FIG. 5, the entire process will be described. When the process of S18 or S25 is completed, SIB1 is acquired in the location registration control unit 12c. Here, based on the CN domain information included in the acquired SIB1, the location registration control unit 12c determines whether to perform location registration in the cell selected as the migration destination (S19, location registration control step). As described above, when the CN domain information included in the acquired SIB1 matches the CN domain information in the cell before the transition, it is determined that the location registration is not performed, and the current location is present (before the transition). If it does not match the CN domain information in the cell, it is determined that the location registration is performed. At this time, the CN domain information of the migration destination cell is stored by the location registration control unit 12c for the next determination.

  When it is determined that the location registration is to be performed, the location registration control unit 12c stores in the control unit 12 that the location registration after cell transfer is necessary (S20). On the other hand, if it is determined not to perform location registration, the above storage process (S20) is not performed. Subsequently, the control unit 12 performs cell migration to the cell selected as the migration destination (S21). This cell transition process is performed according to the information of the broadcast information configuration data acquired by the control unit 12 in S18 or S25.

  Subsequently, the control unit 12 determines whether or not location registration is necessary (S22). This determination is made based on whether or not the location registration is necessary is stored in the control unit 12. When it is stored in the control unit 12 that location registration is required in S20, the control unit 12 performs location registration processing (S23). This location registration processing is performed according to the information of the notification information configuration data acquired by the control unit 12 in S18 or S25. On the other hand, if it is not stored in the control unit 12 that location registration is necessary, the location registration process (S23) is not performed.

  Thereafter, in the mobile communication terminal 10, communication is performed in the cell after cell transition by the function of the control unit 12 or the like. This communication is performed according to the information of the broadcast information configuration data acquired by the control unit 12 in S18 or S25. Subsequently, the mobile communication terminal 10 returns to the process of selecting a migration destination candidate cell (S11), and the subsequent processes are repeatedly executed. The above is a series of processes executed by the mobile communication terminal 10 according to the present embodiment.

  Here, together with the cell configuration shown in FIG. 7 and the configuration of information related to the cell, processing executed by the mobile communication terminal 10 according to the present embodiment and comparison with the conventional mobile communication terminal will be described. As schematically shown in FIG. 7, each cell 30 (generic name of the cells 30 a to 30 g) is included in a cell group 40 (generic name of the groups 40 a and 40 b). When the mobile communication terminal moves from the cell 30a of the same group 40a to the cell 30b, the CN domain information in the cell 30a and the cell 30b is different between “# 1” and “# 10”, respectively. It is necessary to perform location registration in the cell 30b.

  In the mobile communication terminal 10 according to the present embodiment, since the SIB1 including the CN domain information is acquired in response to the cell transition, it can be recognized that the CN domain information is different from before the cell transition, Location registration is performed after cell transfer.

  On the other hand, in the conventional mobile communication terminal, whether or not to receive SIB1 is determined by whether or not the PLMN value-tag included in the MIB is different before and after the cell transition. However, since the PLMN value-tag does not differ by “α” in the group 40a (because it is not changed), the conventional mobile communication terminal does not receive the SIB1. Therefore, the conventional mobile communication terminal cannot recognize that the CN domain information is different from before the cell transition after the cell transition, and therefore, location registration is not performed. If the location registration is not performed, there is a problem that when the mobile communication terminal receives an incoming call, the incoming call cannot be made.

  As described above, the mobile communication terminal 10 according to the present embodiment receives SIB1, which is broadcast information configuration data common to cell group units, including CN domain information, triggered by cell transition. Accordingly, since only the CN domain information is different before and after the cell transition, it is possible to determine the difference in the CN domain information even when the PLMN value-tag is not different. Thereby, in the mobile communication terminal 10 according to the present embodiment, by performing location registration in the corresponding cell, it is possible to receive a call even in a cell in which a conventional call cannot be received.

  Further, as in the present embodiment, in the mobile communication terminal 10, it is desirable that SIB1 to 16 that are broadcast information configuration data of the received cell are stored in the storage unit 13 in association with the cell specifying information. As a result, when the broadcast information of the cell is already received and stored, the broadcast information is received as information used to perform at least one of location registration and communication in the destination cell. Is no longer necessary. As a result, the mobile communication terminal 10 does not need to use a data reception channel for receiving broadcast information, and power consumption in the mobile communication terminal 10 can be reduced. In addition, although it is desirable that all the SIBs 1 to 16 as the broadcast information configuration data are stored in the mobile communication terminal 10, it is not always necessary to store all the SIBs 1 to 16. For example, in the mobile communication terminal 10 according to the present embodiment, it is not necessary to store the SIB3 that is always received when a cell is transferred. Further, the storage unit 13 itself is not necessarily provided in the mobile communication terminal 10.

  In the present embodiment, the mobile communication terminal 10 is a mobile phone, but a terminal that can perform mobile communication other than that, such as a PC (Personal Computer) or a PDA (Personal Digital) having a mobile communication function. Assistance). In this embodiment, the mobile communication system is W-CDMA. However, W-CDMA is not necessarily required as long as the configuration of broadcast information is similar to that of this embodiment.

It is a figure which shows the structure of the mobile communication terminal which concerns on embodiment of this invention. It is a figure which shows the structure of the alerting | reporting information transmitted from a base station, and the timing transmitted. It is a figure which shows the cell information storage table of the memory | storage part in a mobile communication terminal. It is a figure which shows the hardware constitutions of the mobile communication terminal which concerns on embodiment of this invention. It is a flowchart which shows the process (terminal control method) performed with the mobile communication terminal which concerns on embodiment of this invention. It is a flowchart which shows the process in which a memory | storage part memorize | stores alerting | reporting information and cell specific information. It is a figure which shows the example of a structure of the information which concerns on a cell and a cell.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Mobile communication system, 10 ... Mobile communication terminal, 11 ... Transmission / reception part, 12 ... Control part, 12a ... Cell transition detection part, 12b ... Broadcast information receiving part, 12c ... Location registration control part, 13 ... Storage part, 13a ... Cell information storage table, 131 ... scrambling code storage area, 132 ... value-tag storage area, 133 ... Cell ID storage area, 13b ... broadcast information storage area, 101 ... CPU, 102 ... RAM, 103 ... ROM, 104 ... operation , 105 ... wireless communication unit, 106 ... display, 107 ... antenna, 20 ... base station.

Claims (3)

Cell transition detection means for detecting that the terminal itself transitions to the cell;
When cell transition is detected by the cell transition detection means, broadcast information that receives broadcast information common to cell group units, including information indicating the location registration area of the cell, among broadcast information of the destination cell Information receiving means;
Location registration control means for determining whether to perform location registration in the destination cell based on information indicating a location registration area included in the notification information received by the notification information receiving means;
A mobile communication terminal comprising: In order to associate the broadcast information received by the broadcast information receiving means with the cell specifying information for specifying the cell from which the broadcast information is received, and perform at least one of location registration and communication in the destination cell It further comprises storage means for storing information to be used,
The broadcast information receiving means acquires cell specifying information for specifying the destination cell, and if the acquired cell specifying information is not included in the information stored in the storage means, the broadcast information of the destination cell Receive,
The mobile communication terminal according to claim 1. A terminal control method in a mobile communication terminal,
A cell transition detection step for detecting that the terminal itself transitions to the cell;
When cell transition is detected in the cell transition detection step, broadcast information that receives broadcast information common to cell group units, including information indicating the location registration area of the cell, among broadcast information of the destination cell An information receiving step;
A location registration control step for determining whether to perform location registration in the destination cell based on information indicating a location registration area included in the broadcast information received in the broadcast information receiving step;
A terminal control method including:

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