JP4775049B2 - Re-transmission method and mobile radio communication terminal when communication is disconnected - Google Patents

Description

  The present invention relates to a mobile radio communication terminal such as a mobile phone, and in particular, a retransmission technique when reception quality deteriorates due to geographical conditions during movement and communication between a base station and a mobile radio communication terminal is disconnected. About.

  At present, mobile radio communication terminals such as mobile phones using a plurality of communication methods are widely used. In particular, mobile radio communication terminals having various functions such as a mobile radio communication terminal equipped with a GPS (Global Positioning System) function. Is popular. Effective use of these functions is expected to realize stable communication and communication with high added value for the user.

  A mobile radio communication terminal can communicate with other mobile radio communication terminals while moving using base stations arranged at appropriate intervals so that service areas are in contact with each other as relay points. When moving through a place where the electric field is extremely weak locally, even in a service area, such as in a valley of a building or in a tunnel on a highway, in a mobile communication, between base stations A temporary communication failure occurs. In that case, if the base station side disconnects the wireless line and executes a process of disconnecting the line connection by a predetermined call termination process to the other party of the call and releases the connected line, the caller After passing through the weak electric field portion, the call operation must be executed again to resume the call.

  As a means for solving such a problem, in Patent Document 1, when a call is interrupted by entering a local weak electric field area, the mobile radio telephone is immediately re-called from its own device when it leaves the area. The process of sending the specific information is included in advance in the calling process when calling the other party or any subsequent process, and the base station side includes the calling process from the mobile radio telephone or the arbitrary process When specific information is included, respond to the call interruption from the wireless telephone, hold the previous wireless line for a certain period of time, and the previous call destination is disconnected and reconnected By including the process of re-connecting with the other party after waiting for communication resumption from the wireless telephone to be done once after telling that the process is being performed, the line is immediately connected after the end of the passage of the local weak electric field part Automatically technology that can resume the call reconnect has been proposed.

  Further, in Patent Document 2, when the mobile radio telephone and the base station detect that the call is interrupted due to mutual radio wave interruption, the base station notifies the mobile network exchange station of the radio wave interruption. A station holds a call on the network side for a certain period of time, during which the mobile radiotelephone or base station continues to send a predetermined message, and the base station or mobile radiotelephone detects the predetermined message for a certain period of time. When this is notified to the mobile radiotelephone or the base station and the mobile network switching center respectively, the mobile network switching center releases the call hold and reconnects the call. The call can be reconnected quickly and easily after passing through the weak electric field region.

  Also, in mobile radio communication terminals using W-CDMA (Wideband-Code Division Multiple Access), reception quality deteriorates due to geographical conditions such as tunnels, shadows of high-rise buildings, etc., and the base station and mobile radio communication terminals A function is provided for reconnecting the original communication when reception timing synchronization is lost and communication is disconnected. Implementation of reconnection is managed by a timer, and if a communicable base station is detected before the timer expires, reconnection processing is performed, and the base station that can communicate before the timer expires If it is not detected, the reconnection process is not performed. A timer for managing the reconnection is transmitted from the base station to the mobile radio communication terminal. Hereinafter, a timer that manages the execution of reconnection is referred to as a reconnection timer.

  4 to 5 show the time relationship between the reception quality and the reconnection timer when the conventional mobile radio communication terminal performs the reconnection process. FIG. 4 shows a case where the reconnection is successful, and FIG. This shows the case where reconnection fails. The curve associated with the reception quality represents the reception quality of the base station with which the mobile radio communication terminal is communicating.

  In the operation when the reconnection in FIG. 4 is successful, the reception quality of the base station 1 deteriorates due to the influence of a tunnel or the like while communicating with the base station 1, leading to a reception quality that makes it impossible to maintain a call. Communication with the base station is disconnected. Since the reconnection timer is started from the time when the communication is disconnected, and then the base station 2 is detected before the reconnection timer expires, and the reconnection processing is performed at that time, the original communication is reconnected. Is done.

  On the other hand, in the operation when the reconnection shown in FIG. 5 fails, the reception quality of the base station 1 deteriorates due to the influence of a tunnel or the like while communicating with the base station 1, and the reception cannot be maintained. When the quality is reached, the communication with the base station is disconnected. Since the reconnection timer is started from the time when the communication is disconnected and the base station 2 cannot be detected thereafter until the reconnection timer expires, the reconnection of the original communication fails. When the base station 2 is detected after the reconnection timer expires, the mobile radio communication terminal registers its location in the base station 2 from that point and enters a normal standby state.

  FIG. 6 is a flowchart showing a reconnection operation when communication is disconnected in a conventional mobile radio communication terminal.

  In FIG. 6, when the mobile phone terminal is in a communication state with the other party via the base station (S1), the state is changed to a state in which communication is cut off due to reception quality deterioration of the base station with which the mobile phone terminal is communicating (S2). ), A reconnection timer is started (S3). If another base station is detected while the reconnection timer is measuring time (S4: Y), the communication state is again switched to the communication partner via the base station (S1), and the reconnection timer is initialized. . On the other hand, when the reconnection timer expires in a state where another base station cannot be detected (S4: N) (S5: Y), the reconnection timer is initialized and a transition is made to the end of call state (S6). Thereafter, the detection of the base station is continued (S7), and if the base station is detected (S7: Y), the location registration is performed and the normal standby state is set (S8). When the base station is not detected (S7: N), the base station detection operation (S7) is repeated.

JP-A-5-284091 JP-A-6-315006

  According to the above prior art, the reconnection timer puts the communication on hold for a certain period of time for a situation in which the mobile radio communication terminal temporarily enters the weak electric field region during communication and the communication is disconnected. When the communication is possible after escaping from the weak electric field, it is possible to cancel the hold state and continue the communication. Is set at about 30 seconds for voice calls and about 3 minutes for data communications, and is a value that cannot be arbitrarily changed by the user.

  On the other hand, for example, in a tunnel, radio waves from the base station do not reach, reception quality deteriorates, communication is likely to be disconnected, and another base station cannot be detected until it passes through the tunnel, Although the original communication cannot be reconnected, the transit time in the tunnel is not constant depending on the length of the tunnel or the vehicle speed. For this reason, if it is not possible to exit the tunnel within the set time of the reconnection timer, detection of another base station will be unsuccessful during that time, and communication will be possible if the tunnel exits. The communication is completely disconnected.

  In this way, in the case where the reconnection timer expires just before leaving the tunnel and the original communication cannot be reconnected, the user must perform a re-transmission operation of the original communication immediately after leaving the tunnel. become. For example, when a large amount of data is downloaded by packet communication, the large amount of data must be downloaded again, resulting in a problem that the operability is deteriorated.

  From the user's point of view, in such a case, reconnection processing should be performed at the time of exiting the tunnel, but this is not possible with the conventional terminal. On the other hand, when a traffic jam occurs in the tunnel and it takes time until the user exits the tunnel, a situation in which the user no longer desires reconnection or reconnection is assumed.

  In view of the above problems, an object of the present invention is that when a mobile radio communication terminal in communication is disconnected in an area where radio waves from a base station are blocked, the mobile radio communication after the communication disconnection is performed. An object of the present invention is to provide means for enabling a terminal to perform a re-transmission operation for the communication destination automatically and appropriately.

  The present invention possesses a position information acquisition function such as GPS (Global Positioning System) and a database in which areas such as tunnels where radio waves from a base station are blocked and communication cannot be maintained are specified on a map. A mobile radio communication terminal that, when the communication is disconnected, a base station such as a tunnel where the communication is disconnected from the location information obtained from the GPS function and the database held by the mobile radio communication terminal If it is an area where it is impossible to maintain communication due to the interruption of radio waves from the base station, In addition to the acquired reconnection timer, a timer is set inside the terminal, and when moving to a communicable environment, a call is automatically made to the other party.

Specifically, according to the re-transmission method at the time of disconnection of communication according to the present invention, the mobile radio communication terminal has an area on the map in which radio waves from the location information acquisition means and the base station are blocked and communication cannot be maintained. When the communication is disconnected when the specified database is held, the location information obtained from the location information acquisition means is compared with the database, and the location where the communication is disconnected is the radio wave from the base station. Is matched with an area where communication cannot be maintained and the second timer longer than the first timer acquired from the base station and the first timer set separately from the first timer start timer, after the first timer has timed, and when said second timer has become possible to communicate with the base station or another base station before the time is up, the cutting of Characterized by redialing automatically the address of the destination telephone number or destination site of Communication.

In another embodiment of the present invention, the re-transmission method at the time of communication disconnection is such that the mobile radio communication terminal has a location information acquisition means and an area where radio waves from the base station are blocked and communication cannot be maintained. The database specified above is held, the location information obtained periodically from the location information acquisition means is compared with the database, radio waves from the base station are blocked, and communication cannot be maintained. A notice is given when it is predicted to enter the area, and when communication is disconnected after the notice , the first timer acquired from the base station and the first timer are set separately. start the longer second timer from the first timer, the first timer after the time is up, and the second timer of the base station or another base station before the time is up When the signal becomes possible, characterized by redialing automatically to the cut address of the outgoing telephone number or the destination site of Communication.

The mobile wireless communication terminal of the present invention includes a location information acquisition unit that acquires the location of the terminal during communication, a database that stores data in which an area where communication cannot be maintained is specified on a map, a base A first timer acquired from a station and a timer unit having a second timer longer than the first timer set separately from the first timer, and the position information when the communication is disconnected A function of collating the position of the own terminal acquired by the acquiring unit with the data registered in the database , and the result of the collation is data in which the position of the own terminal is registered in the incommunicable position information registering unit; a function to start the counting to start the first and the second timer when a matching, after the first timer has timed, and the second timer is time-up Wherein when communication with the base station or another base station becomes available, has a function of re-transmitting to the cut address of the outgoing telephone number or the destination site of the communication has to.

A mobile radio communication terminal according to another embodiment of the present invention stores a position information acquisition unit that acquires the position of the terminal during communication and data in which an area where communication cannot be maintained is specified on a map. comprising a database for, and a timer unit having a first timer and a long second timer from the first timer set separately from the first timer obtained from the base station, from the position information acquisition unit A function of collating position information obtained periodically with data registered in the database , and as a result of the collation, it is predicted that the radio wave from the base station is cut off and an area where communication cannot be maintained is predicted. a function for advance notice when it is, when the communication after the advance notice has been disconnected, the a function to start counting the first and start the second timer, the first timer Thailand After up and when said second timer has become possible to communicate with the base station or another base station before the time is up, the cut address of the outgoing telephone number or the destination site of Communication The function to re-send to is provided.

  The present invention periodically acquires position information by GPS, and communication disconnection occurred in the tunnel from the position information immediately before the communication disconnection and the map information database stored in the mobile radio communication terminal. If it is determined that, after the reconnection process fails, the call is automatically re-sent to the other party when the call is disconnected if it is possible to make a call through the tunnel. At that time, there is a traffic jam in the tunnel, and it takes time to exit the tunnel, and the user does not want to reconnect or may not need to reconnect. Prepare a timer that can set the desired time. Hereinafter, this timer is referred to as an application timer. If the reconnection timer is longer than the application timer, the reconnection timer is prioritized and the application timer does not operate.

  In the present invention, the GPS function acquires position information when the call is disconnected, compares the information with a database, and when the position where the call is disconnected is determined to be an area where radio waves from the base station are blocked, the application By setting a timer, it is possible to automatically perform a re-call, so when a call is disconnected in a tunnel or the like, it is possible to improve the problem of forcing the user to re-call immediately after leaving the tunnel or the like.

  Furthermore, when information on the location where the call is likely to be cut off is acquired by the GPS function, the call is interrupted in the background before the call is cut off. The call is interrupted because it enters the tunnel. Please wait for a while. By superimposing such information on the voice and informing the connection destination or both, it is possible to obtain another effect that the communication status can be transmitted to the connection destination or both.

  FIG. 1 is a block configuration diagram of a mobile radio communication terminal showing an embodiment of the present invention.

  In FIG. 1, the wireless unit (1) has functions of performing wireless transmission / reception via a base station, measuring signal reception quality from the base station, and receiving broadcast information of the base station. The position information acquisition unit (2) includes a GPS receiver and has a function of measuring the current position of the mobile radio communication terminal. The incommunicable location information registration unit (3) has map information and stores information related to places where communication is impossible, such as tunnels. The timer unit (4) stores a reconnection timer acquired from the broadcast information received from the base station by the radio unit (1) and an application timer that can arbitrarily specify the set time by the user. The timer information is reported to the control unit (5).

  The control unit (5) controls the execution of various functions provided in the mobile radio communication terminal. As control directly related to the present invention, the position information acquired by the position information acquisition unit (2) when the call is disconnected. And the communication location information registration part (3) are compared, and if the communication is disconnected at a place where communication is impossible, such as a tunnel, the reconnection timer and application timer are read from the timer part (4) and reconnected. The main operations of the present invention such as processing and re-transmission processing are executed.

  Although not shown, the mobile radio communication terminal has a battery as an operating power source. When the mobile radio communication terminal is configured as a mobile phone, it is necessary for a key input unit, a display unit, and telephone communication. And various other components such as a call means and an incoming call notification means. The control unit (5) also includes a storage unit including various memories such as a CPU, ROM, RAM, and non-volatile memory (flash memory, etc.) in the control unit (5). The CPU controls the operation of each part of the mobile radio communication terminal by executing a control program stored in a ROM or a non-volatile memory. The RAM stores various data used when the CPU executes various programs. Used as a work area for temporary storage.

  FIG. 2 is a flowchart showing the operation of the first example of the present embodiment. The operation of the present embodiment will be described below with reference to FIGS. In the present embodiment, it is assumed that a fixed time arbitrarily selected by the user is set in the application timer of the timer unit (4).

  The user dials the telephone number of the other party's terminal from the mobile radio communication terminal or enters the address of the connection site for packet communication and sends the call, and the other terminal and the connection site for packet communication respond by receiving the incoming call. At this time, the control unit (5) of the mobile radio communication terminal stores the telephone number of the other party whose communication has been started or the address of the connection site for packet communication in the storage unit. In this way, the mobile radio communication terminal enters a communication state (S1).

  On the other hand, the position information acquisition unit (2) periodically updates the current position information with the data received from the GPS (S2). Thereafter, when the mobile station is out of synchronization with the base station due to reception quality deterioration of the base station with which the mobile radio communication terminal is currently communicating (S3), the position information acquisition unit (2) last updated at that time By comparing the information with the database of the incommunicable location information registration unit (3) (S4), it is determined whether or not the out-of-synchronization location is an area where there is a possibility of communication disconnection such as a tunnel (S5). ).

  If the last updated location information does not match the area information on the database that may cause communication disconnection (S5: N), this communication disconnection is not due to an area that may be disconnected such as a tunnel. Therefore, it is not possible to predict whether or not it will recover after a certain time. Therefore, only the reconnection timer of the timer unit (4) is started to start timing (S6), and the search for the base station is started. If a base station or another base station that has been communicating until now is detected (S7: Y), a reconnection process is performed to establish a call state again (S1), and a reconnection timer is initialized.

  When the base station is not detected (S7: N), this base station search operation is repeated until the reconnection timer expires (S8: N). If the base station is not detected before the reconnection timer expires (S8: Y), the reconnection timer of the timer unit (4) is initialized and transitioned to the end of call state (S9). The search for the base station is continued (S10). If a base station is detected (S10: Y), the detected base station enters a standby state (S20). When the base station cannot be detected (S10: N), the search for the base station is continuously repeated.

  On the other hand, the location information acquisition unit (2) last updated at the point of time (S3) when it is out of synchronization with the base station is compared with the database of the incommunicable location information registration unit (3) (S4). As a result, when it matches the area information where the radio wave is cut off, such as a tunnel registered in the database of the incommunicable location information registration unit (3) (S5: Y), it is read from the timer unit (4). The app timer and the reconnection timer are compared (S11). As a result of the comparison, if the reconnection timer is longer (S11: Y), the reconnection timer is activated to start timing (S6), and the above-described processing after (S6) is performed. Although it is unthinkable to set the normal application timer to be shorter than the reconnection timer, (S11) is provided to prevent malfunction due to a setting error or the like.

  If the result of the comparison is that the app timer is longer (S11: N), the reconnection timer and the app timer are activated simultaneously to start timing (S12). Then, before the reconnection timer expires, another base station is detected (S13: Y), and when the reconnection process is successful, the communication state is again established as in the above-described operation (S1). If another base station is not detected before the reconnection timer expires (S14: Y), the reconnection timer of the timer unit (4) is initialized and transitioned to the call-ending state (S15). Until the application timer expires, the standby state for re-calling (out-of-service standby) is maintained (S16).

  When the same base station or another base station is detected in the standby state for re-transmission (S17: Y), the control unit (5) registers the location in the base station and stores the storage unit. The caller's phone number or packet communication connection site address stored in is read out, and the call is retransmitted to the phone number or packet communication connection site that was communicating before the synchronization was lost. Re-establish (S19). If another base station is not detected before the application timer expires (S18: Y), the application timer of the timer unit (4) is initialized, and then the normal base station detection is continued ( If a base station is detected (S10) (S10: Y), the location is registered and a normal standby state is entered (S20).

  According to the present embodiment, when communication is disconnected due to loss of synchronization or the like during communication, the location information obtained from the GPS function is collated with the database held by the mobile radio communication terminal. When the location is determined to be an area where the radio wave from the base station such as a tunnel is blocked, in addition to the reconnection timer acquired from the base station, a timer is set inside the terminal, and the reconnection timer Even after the time is up, when you move to an environment where you can communicate before the timer set in the terminal times out, it will automatically be re-sent to the other party and you can resume communication. The user does not have to perform an operation for re-transmission.

  FIG. 3 is a flowchart showing the operation of the second example of the present embodiment.

  The basic configuration of this embodiment is the same as that of the first embodiment, but the advantages of the GPS function are further devised. In other words, in this embodiment, when information on a position where the call is likely to be cut off is acquired by the GPS function, the call is interrupted because it enters the tunnel in the background before the call is cut off. "Please wait." Etc. are superimposed on the voice, and the connection destination or both are notified. As described above, in this embodiment, the GPS function can be used to obtain the effect of transmitting the call status to the connection destination.

  Next, the operation of the characteristic part of the present embodiment will be described with reference to FIGS.

  The user dials the telephone number of the other party's terminal from the mobile radio communication terminal or enters the address of the connection site for packet communication and sends the call, and the other terminal and the connection site for packet communication respond by receiving the incoming call. However, the control unit (5) of the mobile radio communication terminal stores in the storage unit the telephone number of the other party whose communication has been started or the address of the connection site for packet communication. In this way, the mobile radio communication terminal enters a communication state (S1).

  On the other hand, the location information acquisition unit (2) periodically updates the current location information with the data received from the GPS (S2), and the control unit (5) registers the updated location information as the incommunicable location information. By periodically collating with the database of the part (3) (S21), the mobile radio communication terminal can move to an area where there is a possibility of disconnection of communication such as a tunnel from the last updated position information and the position information before update. It is determined whether or not there is a possibility of entering (S22), and when there is a possibility that the mobile radio communication terminal enters an area where there is a possibility of disconnection of communication such as a tunnel (S22: Y), Before the call is disconnected, the call will be interrupted because it enters the tunnel. Please wait for a while. Notice to notify (S23).

  Thereafter, when the mobile radio communication terminal is out of synchronization with the base station due to degradation of reception quality of the base station with which the mobile radio communication terminal is currently communicating (S3: Y), the communication disconnection notice (S23) is sent. It is determined whether or not there is (S31), and if there is no communication disconnection notice (S31: N), only the reconnection timer is activated (S6), and there is a communication disconnection notice immediately before At (S31: Y), it is determined that this out-of-synchronization state has entered the area notified by the advance notice, and the reconnection timer and application timer of the timer unit (4) are started simultaneously. Since the subsequent operation is the same as that of the first embodiment, detailed description thereof is omitted.

  According to the present embodiment, the location information obtained from the GPS function and the database held by the mobile radio communication terminal when communication is likely to be cut off in an area such as a tunnel where radio waves from the base station are blocked. It can be determined that communication is likely to be disconnected from the network, and it can be communicated to itself and the other party that communication is likely to be interrupted and that communication is possible again after exiting the tunnel. Therefore, it is possible to predict when the communication is resumed when the communication is disconnected.

  In the above embodiment, the tunnel has been described as an example. However, as an environment in which the same effect can be obtained, the underground and the elevator can be raised. If such an area where radio waves are blocked is registered in the incommunicable position information registration unit (3) as a database, the effect of the present invention can be obtained.

  In the above embodiment, the time set in the application timer has been described as being set regardless of the area where the radio wave from the base station is blocked. By estimating the time until communication is possible, the time set in the application timer is selected for each area and registered in the incommunicable location information registration unit (3), and the location where the communication is disconnected is When it coincides with an area where the radio wave from the station is blocked and communication cannot be maintained, the setting time of the application timer registered in association with the area is read out from the incommunicable position information registration unit (3). The timer may be set in the application timer of the timer unit (4).

It is a block block diagram of the mobile radio | wireless communication terminal which shows embodiment of this invention. It is a flowchart which shows operation | movement of the 1st Example of this embodiment. It is a flowchart which shows operation | movement of the 2nd Example of this embodiment. It is a figure which shows the time relationship between the reception quality at the time of a mobile radio | wireless communication terminal performing a reconnection process, and a reconnection timer. It is a figure which shows the time relationship between the reception quality at the time of a mobile radio | wireless communication terminal performing a reconnection process, and a reconnection timer. It is a flowchart which shows the reconnection operation | movement at the time of the communication disconnection in the conventional mobile radio | wireless communication terminal.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Radio | wireless part 2 Position information acquisition part 3 Communication impossible position information registration part 4 Timer part 5 Control part

Claims (7)

When the mobile radio communication terminal has a database that specifies the location information acquisition means and the area on the map where the radio wave from the base station is blocked and the communication cannot be maintained, and communication is disconnected The location information obtained from the location information acquisition means is collated with the database, and the location where the communication is cut off coincides with the area where the radio wave from the base station is blocked and the communication cannot be maintained. Sometimes, after starting the first timer acquired from the base station and the second timer longer than the first timer set separately from the first timer , the first timer is timed up, and wherein when the second timer has become possible to communicate with the base station or another base station before the time is up, add the cut destination telephone number or destination site communication Recall process when communication disconnection, characterized by redialing automatically relative scan. The mobile wireless communication terminal has a location information acquisition means and a database in which an area where radio communication from the base station is blocked and communication cannot be maintained is specified on the map, and the location information acquisition means periodically The position information obtained in advance and the database are collated, and a notice of advance notice is given when it is predicted that a radio wave from the base station is cut off and the communication cannot be maintained, and the notice of notice is given. When communication is later disconnected , the first timer acquired from the base station and a second timer longer than the first timer set separately from the first timer are started, and the first timer after the timer has timed, and the when the second timer has become possible to communicate with the base station or another base station before the time is up, the destination telephone number of the cutting communication Recall process when communication disconnection is properly characterized by redialing automatically the address of the destination site. A position information acquisition unit that acquires the position of the self terminal during communication, a database maintained is not possible areas of communication to store data that is specified on the map, the first timer and said acquired from the base station A timer unit having a second timer longer than the first timer set separately from the first timer ;
The function of collating the position of the terminal acquired by the position information acquisition unit with the data registered in the database when the communication is disconnected, and the position of the terminal as a result of the verification is not possible to communicate a function to start the counting to start the first and the second timer when matches the data registered in the location information registration section, after the first timer has timed, and the second When communication with the base station or another base station becomes possible before the timer expires, a function is provided for re-sending to the destination telephone number or destination site address of the disconnected communication. A mobile radio communication terminal. A position information acquisition unit that acquires the position of the self terminal during communication, a database maintained is not possible areas of communication to store data that is specified on the map, the first timer and said acquired from the base station A timer unit having a second timer longer than the first timer set separately from the first timer ;
The function of collating the position information periodically obtained from the position information acquisition unit with the data registered in the database , and as a result of the collation, radio waves from the base station are cut off and communication cannot be maintained. a function for advance notice when it is expected to enter the area, when the communication after the advance notice is disconnected, the function of starting the time measurement by activating the first and second timers, the second When communication with the base station or another base station becomes possible after one timer expires and before the second timer expires, the telephone number of the disconnected communication or A mobile radio communication terminal having a function of re-transmitting to an address of a connection destination site . In the database , a location where communication with the base station is predicted to be disconnected when communication is performed while moving, and map data are registered in association with each other. The mobile radio communication terminal according to claim 3 or 4. The mobile radio communication terminal according to any one of claims 3 to 5, wherein the time set in the second timer is configured to be arbitrarily set by a user. The time set in the second timer is selected for each area where radio waves from the base station are cut off and registered in the database , and the place where the communication is cut off is cut off from the base station. A function to read the set time of the second timer registered in association with the area and set it as an initial value in the second timer when it matches an area where communication cannot be maintained The mobile radio communication terminal according to any one of claims 3 to 5, wherein the mobile radio communication terminal is provided.

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