JP2002078001A - Portable communication terminal, and mobile communication system using it and remote control method for its communication function - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a portable communication terminal the start/stop of the communication function of which can be remotely controlled from other terminal by the user of the portable communication terminal without the need for request to the communication enterprise in order to prevent illegal use of the portable communication terminal on the occurrence of missing/theft of the portable communication terminal. SOLUTION: A communication section of the portable communication terminal 1 is independently provided with a communication function control circuit to control the communication function of its communication circuit for a speech. The communication function control circuit has a recognition function of a password, a position registration function, a communication function of a communication control signal, and a communication function start/stop function and is always in operation independently of an ON/OFF state of the power supply and a start/stop state of the communication function of the communication circuit. The other communication terminal 4 transmits a communication function start/stop signal to the portable communication terminal 1 via a mobile subscriber exchange 3 and a base station 2, the communication function control circuit of the portable communication terminal authenticates the password and starts/stops the communication function of the communication circuit when the password is coincident.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mobile communication terminal, a mobile communication system using the same, and a remote control method of a communication function thereof. The present invention relates to a mobile communication system including an exchange for controlling communication between terminals, a mobile communication terminal used for the mobile communication terminal, and a remote control method of the communication function.

[0002]

2. Description of the Related Art In a conventional portable communication terminal, when it is lost or stolen and then reaches another person's hand, a power supply is turned on by a user's hand.
It is impossible to stop the FF / communication function or the like, and usually the communication function is often stopped by a service stop request to a communication carrier. An exchange in a communication company has communication control state information for each subscriber (portable communication terminal) and activates / stops a communication function for each subscriber.

When the power of the portable communication terminal is turned off, external control cannot be performed, and it is necessary to wait until the power is turned on.

[0004]

In the above-mentioned conventional portable communication terminal, since the communication function stop processing is performed on the exchange side, it is necessary to contact a communication carrier, and the user himself / herself starts and stops the communication function. Can not do. Therefore, in the communication function control by the exchange, there may be a delay until the start / stop of the communication function, such as when the communication carrier is out of business hours. Since it is necessary to have communication control information for each subscriber, the scale of the switching system may be increased.

In addition, the power of the portable communication terminal is turned off,
Alternatively, when the communication control function is stopped, there is a problem that it is impossible to control the communication terminal from outside.

Further, even when the communication function is stopped in the exchange, the location registration function of the portable communication terminal does not operate, so that there is a problem that the position of the portable communication terminal cannot be grasped. It was difficult to do so.

Therefore, an object of the present invention is to improve operability and maintainability in preventing unauthorized use of a portable communication terminal when it is lost or stolen. In other words, an object of the present invention is to provide a communication terminal control function that allows a user to remotely start and stop a communication function by a remote operation from another terminal by a user, instead of requesting a communication carrier. As for the operation method, since the remote operation can be performed by the simple message communication between the communication terminals, the communication function operation can be easily performed. In addition, the function to promptly stop or start the communication function such as loss or theft, and to operate the location registration function and password identification function even when the communication function is stopped, so that the position of the lost or stolen location can be grasped. , And remote operation is always possible within the call area regardless of the power supply ON / OFF state.

[0008]

A portable communication terminal according to a first aspect of the present invention includes a base station corresponding to a service area for wireless communication, and an exchange for controlling communication between the terminals via the base station. In a mobile communication terminal of a mobile communication system comprising: a communication circuit for communicating with another communication terminal via the base station; and a constant power supply to some circuits irrespective of an ON state or an OFF state of a power supply of a main body. And a position recognition control unit that is provided separately from the communication circuit, and performs position registration of the terminal via the base station.
A password recognition control unit for transmitting and receiving a message for controlling a communication function of the communication circuit via the base station and performing authentication of the received password; and a recognition result of the password recognition control unit. A communication start / stop control unit for starting or stopping the communication function of the communication circuit, receiving power from the power supply circuit at all times, and operating even when the communication function of the communication circuit is stopped; A function control circuit, and has a configuration in which activation or stop of a communication function of the communication circuit can be controlled by a message from another communication terminal.

A portable communication terminal according to a second aspect of the present invention comprises:
2. The portable communication terminal according to claim 1, wherein the communication function control circuit, upon receiving the communication function control request signal, recognizes the request as a start of control of the communication function for the communication circuit and returns a communication function control request reception signal. When the subsequent processing is started and a password for authenticating the validity of the communication function control and a communication function control signal designating either activation or deactivation of the communication function are received, a pre-set password in the own terminal is received. Verifies the number with the received PIN,
In the case where they match in the authentication, a configuration is provided in which start or stop of the communication function of the communication circuit is controlled based on the communication function control signal received at the same time.

A mobile communication system according to a third aspect of the present invention is a mobile communication system comprising a base station corresponding to a service area for wireless communication and an exchange for controlling communication between terminals via the base station. 3. The mobile communication terminal according to claim 1, wherein the mobile communication terminal moves in the service area and transmits and receives a signal to and from the base station, and is connected to the exchange for controlling a communication function of a communication circuit of the mobile communication terminal. And a communication terminal for transmitting a message.

[0011] In a mobile communication system according to a fourth aspect of the present invention, in the mobile communication system according to the third aspect, when the mobile communication terminal is not in the service area, the mobile station transmits the mobile communication terminal to the mobile communication system. A configuration for temporarily storing a message for controlling the communication function to a terminal, and transmitting the stored message for controlling the communication function to the mobile communication terminal when the mobile communication terminal enters the service area. Having.

According to a fifth aspect of the present invention, there is provided a remote control method for a communication function of a portable communication terminal, comprising: a base station corresponding to a service area for wireless communication; and an exchange for controlling communication between the terminals via the base station. In the method for controlling a communication function of a portable communication terminal used in a mobile communication system, a communication function control circuit provided separately from a communication circuit for performing communication with another communication terminal of the portable communication terminal always includes a power supply. The communication function control circuit of the mobile communication terminal transmits a communication function control request signal indicating a request to start control of a communication function from the communication terminal on the transmission side to the mobile communication terminal via the exchange. When the communication function control request signal is received, the communication function control request reception signal indicating the reception of the communication function control request signal is recognized as a request to start control of the communication function for the communication circuit. Sends back, transmits a message requesting the input of the communication function control signal for designating either the start or stop of the personal identification number and a communication function for authenticating the validity of the communication function control to the communication terminal,
According to the message in the communication terminal, transmitting a personal identification number and a communication function control signal, and receiving the personal identification number and the communication function control signal in the communication function control circuit of the portable communication terminal, a previously set personal identification number and Authentication with the received security code is performed, and if they match, according to the information on the start or stop of the communication function control signal received at the same time,
A step of starting or stopping a communication function of the communication circuit.

According to a sixth aspect of the present invention, there is provided a remote control method for a communication function of a portable communication terminal, comprising: a base station corresponding to a service area for wireless communication; and an exchange for controlling communication between the terminals via the base station. In the method for controlling a communication function of a portable communication terminal used in a mobile communication system, a communication function control circuit provided separately from a communication circuit for performing communication with another communication terminal of the portable communication terminal always includes a power supply. Supply, a communication function control request signal indicating a request to start control of a communication function is transmitted from the communication terminal on the transmitting side to the portable communication terminal via the exchange, and the exchange sends the communication function control request signal to the portable communication terminal. After transmitting the communication function control request signal, if the communication control request reception signal could not be received within a predetermined time, it is determined that the mobile communication terminal is out of the communication area,
A message requesting an input of a communication function control signal for designating either a password or a communication function for authenticating the validity of the communication function control for the communication terminal on behalf of the mobile communication terminal. In accordance with the message, the communication terminal transmits a password and a communication function control signal, and the exchange temporarily stores a communication function control request signal, a password and a communication function control signal which are control information of these communication functions. When the mobile communication terminal enters the call area, the control information of the held communication function is transmitted to the mobile communication terminal, and the personal identification number and the communication function are stored in the communication function control circuit of the mobile communication terminal. When the control signal is received, authentication is performed between the preset password and the received password, and if they match, the communication function control signal received at the same time is received. In accordance with the information of the dynamic or stop, a step of performing start or stop the communication function of the communication circuit.

[0014]

DESCRIPTION OF THE PREFERRED EMBODIMENTS First, the outline of the present invention will be described.
The present invention is characterized in that a communication unit in a portable communication terminal used in a mobile communication system is provided with a communication function control circuit for controlling a communication function of a communication circuit for a call independently. In the communication function control circuit, a password authentication function, a location registration function, a communication control signal communication function,
It has a stop function, and its operation always functions irrespective of the ON (ON) / OFF (OFF) state of the power supply of the portable communication terminal body and the start / stop state of the communication function of the communication circuit.

By having a communication function control circuit in the portable communication terminal, when a signal for starting / stopping a communication function from another calling communication terminal to the called portable communication terminal is generated, the calling communication terminal in the portable communication terminal is generated. Authentication is performed between the transmitted personal identification number and the personal identification number in the mobile communication terminal, and if they match, the communication function of the mobile communication terminal can be started / stopped.

When the mobile communication terminal is out of the communication area, the communication function control signal is temporarily held in the exchange, and when the mobile communication terminal enters the communication area, communication for control processing of the communication function is started immediately. Perform start / stop processing. Since this operation is performed irrespective of ON / OFF of the power supply, the start / stop function of the communication function can always be operated in a state other than the area outside the call area. Also, after the communication function is stopped,
Since the location registration function operates, the location of the portable communication terminal can be registered in the exchange, and the caller communication terminal can grasp the location of the called portable communication terminal.

Next, embodiments of the present invention will be described in detail with reference to the drawings.

FIG. 1 is a block diagram of an embodiment of the present invention. Referring to FIG. 1, the mobile communication system of the present invention communicates with a portable communication terminal 1 having a communication function control circuit, which is a called subscriber, and has a call service area 21 and wirelessly communicates with the portable communication terminal 1. Base station (BS) 2
A mobile subscriber exchange (LS) 3 having a signal holding memory 31 and controlling communication between the mobile communication terminal 1 and other subscribers via the base station 2, and a wired or wireless network (not shown). And a communication terminal 4 that is a calling subscriber connected to the mobile subscriber exchange 3 via the mobile subscriber exchange 3.

FIG. 2 is a block diagram showing an example of the detailed internal configuration of the portable communication terminal 1. Referring to FIG. 2, a mobile communication terminal 1 includes a voice / data communication circuit (MV) 11 for performing normal voice / data communication processing via a base station 2 and a power supply circuit ( PW) 12 and a communication function control circuit (COM) 1 provided separately therefrom.
3 is provided.

The communication function control circuit 13 includes a position recognition control unit (ER) 131 and a password authentication control unit (KY) 132
And a communication function start / stop control unit (ONF) 133. The communication function control circuit 13 is directly supplied with power from the power supply circuit 12, and the portable communication terminal 1 (main body)
Is always supplied with power only to the communication function control circuit 13 even when the power supply is turned off.
Can be operated irrespective of ON / OFF of the power supply of the main body. Note that the power of the main unit is turned off
At that time, power supply to other blocks is cut off.

The location recognition control unit 131 is a block for performing a location registration process of a normal portable communication terminal via the base station 2. The location recognition control unit 131 of the base station 2 having jurisdiction over the communication service area 21 where the own portable communication terminal 1 is located. It has a function of registering the position (base station identification information) in the mobile subscriber exchange 3.

The password authentication control unit 132 has a function of transmitting / receiving a communication function control signal / message to / from the communication terminal 4 on the calling side via the base station 2 and the mobile subscriber exchange 3, and a function of authenticating a password. The communication function control signal is communicated with the communication terminal 4, and if the authentication with the password from the communication terminal 4 matches, the control operation is transferred to the communication start / stop control unit 133 together with the communication function control signal.

The communication start / stop controller 133 is a block having a function of managing the communication function state of the portable communication terminal 1 and a function of starting / stopping the communication function.
In accordance with the communication function control signal from the communication device 2, the communication function of the voice / data communication circuit 11 is started / stopped.

Next, the operation of the present system will be described in detail with reference to the sequence diagrams of FIGS.
FIG. 3 shows a signal / message transmission / reception sequence between the communication terminal 4, the mobile subscriber exchange 3, and the mobile communication terminal 1 when the mobile communication terminal 1 is in the call service area 21 at the time of calling the communication terminal 4. Reference numeral 4 denotes a transmission / reception sequence when the mobile communication terminal 1 is not in the call service area 21 when the communication terminal 4 makes a call.

When starting or stopping the communication function from the communication terminal 4 on the transmitting side to the portable communication terminal 1 on the receiving side,
Call from the communication terminal 4 to the mobile communication terminal 1 via the mobile subscriber exchange 3 (dial the number of the mobile communication terminal 1)
Then, a communication function control request signal indicating a request to start setting and controlling the communication function is transmitted.

In the mobile subscriber exchange 3, when the communication function control request signal is input to the communication control information from the calling communication terminal 4, the called mobile communication terminal 1 is called via the base station 2. Transmits the communication function control request signal.

Communication function control circuit 13 in portable communication terminal 1
When a communication function control request signal addressed to the terminal itself is received, unlike a call for a normal telephone call, it is recognized as a start request for setting and control of a communication function for the voice / data communication circuit 11, and the subsequent processing proceeds. That is, a communication function control request reception signal indicating the reception of the communication function control request signal is returned to the mobile subscriber exchange 3 via the base station 2, and the communication function control information is transmitted to the communication terminal 4 on the transmitting side. A password for authenticating the validity of the communication function control, and a communication function control signal (communication function start signal and communication function stop signal, hereinafter referred to as communication function control ( (A start / stop signal) or a communication function start / stop signal).

After transmitting the communication function control request signal to the mobile communication terminal 1, the mobile subscriber exchange 3 receives the communication function control request reception signal within a predetermined time. It is determined that it is within the call service area 21 (the area within the call area), and the connection processing between the communication terminal 4 on the calling side and the portable communication terminal 1 on the called side is continued.
Transmits a message for requesting input of a password and a communication function control signal to the communication terminal 4.

The message for requesting the input of a personal identification number and a communication function control signal transmitted to the communication terminal 4 is automatically generated by the mobile subscriber exchange 3 which has received the communication function control request reception signal from the portable communication terminal 1. Can be
In this case, the mobile communication terminal 1 does not need to transmit the message.

The communication terminal 4 on the calling side responds to the message for requesting the input of a personal identification number / communication function control signal and the personal identification number set in the portable communication terminal 1 on the receiving side and a desired communication function control signal (communication function activation). Signal or communication function stop signal). The input signal is transmitted to the mobile communication terminal 1 via the mobile subscriber exchange 3 and the base station 2.

On the other hand, if the mobile subscriber exchange 3 does not receive the communication function control request reception signal within a predetermined time after transmitting the communication function control request signal to the portable communication terminal 1,
The mobile subscriber exchange 3 determines that the mobile communication terminal 1 on the receiving side is outside the communication service area 21 (out of the communication area), and issues a password and a communication function to the communication terminal 4 on the calling side in place of the mobile communication terminal 1. A message requesting input of a control signal and a message indicating that the portable communication terminal 1 is out of the service area are transmitted.

In response to these messages, after inputting a personal identification number and a communication function control (start / stop) signal from the communication terminal 4, the mobile subscriber exchange 3 sets the receiving side portable communication terminal 1 to the call service area 21. The communication function control information (communication function control request signal, personal identification number, communication function control (start / stop) signal, etc.) is temporarily held in the signal holding memory 31 until the mobile communication terminal 1 Performs transmission processing of the control information of the communication function held in the signal holding memory 31 to the portable communication terminal 1 when the user enters the communication area. That is, the communication function control request signal is transmitted to the mobile communication terminal 1.
When the communication function control request reception signal is returned within a predetermined time, the personal identification number and the communication function control (start / stop) signal are transmitted to the mobile communication terminal 1.

Whether the portable communication terminal 1 has entered the communication area can be determined by a position registration request from the portable communication terminal 1. That is, the communication function control circuit 1
The position recognition control unit 131 of the third base station monitors the base station identification information (number) transmitted from the base station 2 and, when the base station 2 can newly receive the base station 2, recognizes that it has entered the call service area 21 and recognizes the base station 2. A signal for requesting location registration of the terminal is transmitted to the mobile subscriber exchange 3 together with the base station identification information. The mobile subscriber exchange 3 registers the location of the mobile communication terminal 1 in the location registration database (registers the base station identification number) based on the location registration request.

When the communication function control circuit 13 in the portable communication terminal 1 on the receiving side receives the personal identification number / communication function control (start / stop) signal, it sets a predetermined personal identification number in the terminal itself and the received personal identification number. Authenticate.

If they match in the authentication, the communication start / stop control unit 133 in the communication function control circuit 13
According to the information on the activation or deactivation of the dialed communication function control signal, the own portable communication terminal 1 (voice / data communication circuit 1)
The communication function of 1) is started or stopped, and a communication function control completion message is transmitted to the communication terminal 4 on the transmitting side.

Note that the control information (communication function control request signal, personal identification number, communication function control signal, etc.) of the communication function stored in the mobile subscriber exchange 3 when the mobile communication terminal 1 enters the area from outside the communication area. Is received, a communication function control completion message indicating the completion of the communication function control processing is sent to the mobile subscriber exchange 3. Mobile subscriber exchange 3
Receives the communication function control completion message from the mobile communication terminal 1, calls back the communication terminal 4 on the transmitting side, and transmits the communication function control completion message.

The mobile communication terminal 1 in which the communication function of the voice / data communication circuit 11 is stopped by the above-described processing.
In this case, even if the power is turned on, communication for a normal call cannot be performed. As a result, unauthorized use at the time of loss or theft can be prevented.

Further, even when the portable communication terminal 1 (the voice / data communication circuit 11) on the receiving side is in a communication function stopped state, the position recognition control unit 131 in the communication function control circuit 13
Since the communication operation is possible in the password authentication circuit 132, the communication terminal 4 transmits a communication function control signal (communication function start signal) designating the start of the communication function again and sets the communication function in the portable communication terminal 1. By doing so, the communication function of the portable communication terminal 1 (its voice / data communication circuit 11) which has been in the communication function suspended state can be restarted. Furthermore, based on the location registration information for the mobile subscriber exchange 3 based on the base station identification information (number) from the base station 2 of the mobile communication terminal 1, the communication terminal 4 on the calling side determines the location of the mobile communication terminal 1. The position can be grasped (confirmed).

An example of a method for confirming the position of the portable communication terminal 1 will be described below.

First, the communication terminal 4 transmits a position recognition control signal to the portable communication terminal 1. When the mobile communication terminal 1 receives the position recognition control signal, the mobile communication terminal 1 transmits a control signal for transmitting a base station identification number to the communication terminal 4 to the mobile subscriber exchange 3. The mobile subscriber exchange 3
Upon receiving the control signal, the base station transmits the base station identification number to the communication terminal 4, and the communication terminal 4 receives the base station identification number.

The following two methods are conceivable for the communication terminal 4 to confirm the location of the portable communication terminal 1 from the base station identification number.

The first method is that, when the communication terminal 4 transmits a base station identification number together with a position search control signal to the switching system, the switching system searches for an address from the base station identification number, 4 is a method of transmitting the location address information of the mobile communication terminal 1 and the vicinity map data to the terminal 4. The communication terminal 4 (user) can confirm the location (area) of the mobile communication terminal 1 based on the received address and map data.

The second method is a method in which the communication terminal 4 has data (corresponding to an enormous amount of data) between the base station identification number and the actual address. The communication terminal 4 can confirm the location (area) of the portable communication terminal 1 by searching for and displaying the actual address by referring to the corresponding data with the received base station identification number.

As another embodiment of the present invention, in the communication function control circuit 13 described above, in addition to the communication start / stop control unit 133, a function of referring to a memory (address book or the like) of a communication terminal, By providing a circuit unit having a function such as a power ON / OFF function, it is possible to remotely control the portable communication terminal 1 in various forms.

It is also possible to prompt the input of a personal identification number and a communication function control signal by voice guidance or the like in addition to the simple message.

[0046]

According to the present invention, the following effects can be obtained.

First, the first effect is that the communication function of the mobile communication terminal on the receiving side can be started / stopped from the communication terminal on the transmitting side, and in the case of emergency such as loss or theft of the communication terminal, This means that the communication function can be stopped and started immediately without having to request a third party.

The second effect is that by providing a communication control function in the portable communication terminal, remote control can be performed on the exchange system without being affected by a major function change or the like. It is.

A third effect is that since the communication control circuit is individually connected to the power supply, it is possible to remotely control the portable communication terminal regardless of whether the power supply is on or off. It is.

[Brief description of the drawings]

FIG. 1 is a block diagram showing an embodiment of a mobile communication system according to the present invention.

FIG. 2 is a diagram illustrating a configuration of a mobile communication terminal according to the present invention.

FIG. 3 is a diagram showing a signal / message transmission / reception sequence between each terminal and an exchange when the portable communication terminal is in a call service area when a call is made by the communication terminal.

FIG. 4 shows a signal between each terminal and the exchange when the mobile communication terminal is not in the call service area at the time of calling the communication terminal.
It is a figure which shows the transmission / reception sequence of a message.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Mobile communication terminal 2 Base station 3 Mobile subscriber exchange 4 Communication terminal 11 Voice / data communication circuit 12 Power supply circuit 13 Communication function control circuit 131 Position recognition control part 132 PIN authentication control part 133 Communication start / stop control part

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 5J104 AA07 AA12 EA08 KA01 NA05 NA38 NA43 PA02 5K027 AA11 BB04 BB08 CC08 HH22 HH24 5K033 BA08 DA01 DA19 DB25 EC01 5K067 AA32 DD17 DD27 EE02 EE10 EE16 HH23

Claims (6)

[Claims] 1. A portable communication terminal of a mobile communication system comprising: a base station corresponding to a service area for wireless communication; and an exchange for controlling communication between terminals via the base station. A communication circuit for performing communication with the communication terminal, a power supply circuit capable of constantly supplying power to a part of the circuit regardless of the power-on state or the power-off state of the main body, provided separately from the communication circuit, A position recognition control unit for performing position registration of the own terminal via the base station, for transmitting and receiving a message for controlling a communication function of the communication circuit via the base station, and for authenticating a received password; And a communication start / stop control unit for starting or stopping a communication function of the communication circuit based on a recognition result of the password recognition control unit. And a communication function control circuit operable even when the communication function of the communication circuit is stopped, and controls the start or stop of the communication function of the communication circuit by a message from another communication terminal. A mobile communication terminal characterized by being made possible. 2. When the communication function control circuit receives a communication function control request signal, the communication function control circuit recognizes it as a request to start control of the communication function for the communication circuit, returns a communication function control request reception signal, and starts subsequent processing. When receiving a password for authenticating the validity of the communication function control and a communication function control signal designating either activation or deactivation of the communication function, a predetermined password in the terminal and the received password are received. 2. The mobile communication terminal according to claim 1, wherein the mobile communication terminal performs authentication with a number, and when the authentication is matched, starts or stops the communication function of the communication circuit based on the communication function control signal received at the same time. . 3. A mobile communication system comprising a base station corresponding to a service area for wireless communication, and an exchange for controlling communication between terminals via the base station, wherein the mobile station moves within the service area and communicates with the base station. 3. The mobile communication terminal according to claim 1, which transmits and receives signals, and a communication terminal connected to the exchange and transmitting a message for controlling a communication function of a communication circuit to the mobile communication terminal. Characteristic mobile communication system. 4. The exchange, when the mobile communication terminal is not in the service area, temporarily stores a message for controlling the communication function from the communication terminal to the mobile communication terminal, wherein the mobile communication terminal The mobile communication system according to claim 3, wherein the mobile communication terminal transmits the stored message for controlling the communication function to the portable communication terminal when the mobile communication terminal enters the service area. 5. A method for controlling a communication function of a mobile communication terminal used in a mobile communication system comprising a base station corresponding to a service area for wireless communication and an exchange for controlling communication between the terminals via the base station. A power supply is always supplied to a communication function control circuit provided separately from a communication circuit for performing communication with another communication terminal of the portable communication terminal, and the portable communication terminal transmits the portable communication terminal via the exchange from the communication terminal. A communication function control request signal indicating a request to start control of the communication function is transmitted to the terminal, and when the communication function control request signal is received by the communication function control circuit of the portable communication terminal, the communication function for the communication circuit is Recognizes the request as a control start request, returns a communication function control request reception signal indicating reception of the communication function control request signal, and corrects the communication function control to the communication terminal. Send a message requesting the input of a communication function control signal that specifies either the activation or deactivation of a password and a communication function to authenticate the, according to the message at the communication terminal, a password and a communication function control signal When the communication function control circuit of the mobile communication terminal receives the personal identification number and the communication function control signal, it performs authentication of a predetermined personal identification number and the received personal identification number, and when they match, simultaneously. A remote control method for a communication function of a mobile communication terminal, wherein the communication function of the communication circuit is started or stopped according to information on the start or stop of the received communication function control signal. 6. A method for controlling a communication function of a mobile communication terminal used in a mobile communication system comprising a base station corresponding to a service area for wireless communication and an exchange for controlling communication between terminals via the base station. A power supply is always supplied to a communication function control circuit provided separately from a communication circuit for performing communication with another communication terminal of the portable communication terminal, and the portable communication terminal transmits the portable communication terminal via the exchange from the communication terminal. A communication function control request signal indicating a request to start control of the communication function is transmitted to the terminal, and after the communication function control request signal is transmitted to the portable communication terminal by the exchange, the communication control request is received within a predetermined time. If no signal is received, it is determined that the mobile communication terminal is out of the service area, and the communication function control is authenticated for the communication terminal on behalf of the mobile communication terminal. A message for requesting the input of a communication function control signal for designating any one of activation and deactivation of a password and a communication function is transmitted, and the communication terminal transmits a password and a communication function control signal according to the message. The exchange temporarily stores a communication function control request signal, a password, and a communication function control signal which are control information of these communication functions, and when the mobile communication terminal enters the communication area, the communication function of the held communication function is stored. When the control information is transmitted to the mobile communication terminal, and the password and the communication function control signal are received by the communication function control circuit of the mobile communication terminal, authentication of the previously set password and the received password is performed. If they match, the communication function of the communication circuit may be started or stopped according to the start or stop information of the communication function control signal received at the same time. Remote control method of the communication function of the mobile communication terminal according to claim.