JP2013093678A - Wireless communication system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To surely prevent unauthorized use of a terminal station even when the terminal station is stolen or lost.SOLUTION: A wireless communication system of a SCPC method comprises: a terminal station having a terminal station storage part for storing an identifier for identifying the terminal station; a base station wirelessly connected to the terminal station; and a communication desk which is connected to the base station and performs an instruction for the terminal station. When an operation part in the communication desk accepts a function restriction request for restricting a function of a specific terminal station, the communication desk makes the base station repeatedly transmit a function restriction request signal including an identifier of the specific terminal station to the terminal station. When the identifier of the specific terminal station included in the function restriction request signal received from the base station agrees with an identifier of the terminal station stored in a terminal station storage part; the terminal station shifts to a function restriction state for restricting a function of the terminal station, and transmits a function restriction response signal for showing that the function restriction request signal has been received to the base station. When receiving the function restriction response signal, the communication desk makes the repetitive transmission of the function restriction request signal be stopped.

Description

  The present invention relates to a wireless communication system that performs a wireless call or the like between a terminal station and a communication console via a base station. For example, when the terminal station is stolen or the terminal station is lost, the terminal station The present invention relates to a digital mobile communication system capable of limiting the functions of

FIG. 1 shows a schematic configuration example of a wireless communication system related to this technical field. In this wireless communication system, an SCPC method (Single Channel Per Carrier) in which one carrier is assigned to one channel for transmitting voice data is used. The SCPC digital wireless system is defined by, for example, the digital communication system standard ARIB STD-T61.
In the system of FIG. 1, a communication console (also referred to as a control console or command board) 10, a private branch exchange (PBX) 70 for connection to an extension telephone, a line controller 20, and a base station 30 (1 ), Mobile devices (mobile radio devices) 40 (1) to 40 (4) that are mobile stations, on-vehicle devices (on-vehicle wireless devices) 50 (1) to 50 (3) that are mobile stations, and fixed or half Fixed stations 60 (1) to 60 (2).

  The communication console 10 and the line control device 20 are connected by a wired transmission line 5, the line control device 20 and the PBX 70 are connected by a wired transmission line 6, and the line control device 20 and the base station 30 (1) are wired. Alternatively, they are connected by a transmission line 4 such as a micro line. A plurality of base stations 30 can be installed. When representing a plurality of base stations, it is referred to as a base station 30; when representing a plurality of portable devices, it is referred to as a portable device 40; when representing a plurality of in-vehicle devices, it is referred to as an in-vehicle device 50; When a fixed station is represented, it is called a fixed / semi-fixed station 60. In addition, the portable device 40, the in-vehicle device 50, and the fixed / semi-fixed station 60 are collectively referred to as a terminal station.

  The terminal station can be wirelessly connected to the base station 30, and the communication console 10, the terminal station, and the terminal stations are connected by telephone communication through base station communication via the base station 30. Further, the terminal stations can be connected by direct communication between the terminal stations without using the base station 30. In FIG. 1, for example, the portable device 40 (1) and the vehicle-mounted device 50 (1) are connected by base station communication, and the portable device 40 (3) and the portable device 40 (4) communicate directly between terminal stations (in this case, (Direct communication between mobile stations)

Each base station 30 has a base zone (also referred to as a communication zone or a communication area). For example, the base station 30 (1) has a base zone 1, but due to frequency restrictions, a plurality of base stations 30 (1) have a plurality of base zones. Transmission to the terminal station is performed using the same transmission frequency (downstream signal frequency from the base station to the terminal station: f2), and the same reception frequency (upstream signal frequency from the terminal station to the base station: f1). It is comprised so that it may receive using. As described above, in base station communication via a base station, duplex communication in which bidirectional communication is performed simultaneously is possible.
Further, in the direct communication between terminal stations, the frequency f3 is used in both the upstream and downstream directions, and simplex communication that allows communication in only one direction at the same time is performed.

  In this wireless communication system, in base station communication from a terminal station to another terminal station, for example, base station communication from a portable device 40 in the base zone 1 to another portable device 40 in the same base zone 1 Is configured such that the audio signal transmitted from the transmission source portable device 40 is returned by the base station 30 and transmitted to all the terminal stations in the base zone 1. This is because the uplink signal frequency from the terminal station to the base station 30 is only one wave (frequency f1), so that when a terminal station is already in a call, other terminal stations cannot transmit. It is also for notifying other terminal stations of the content of the call. For this reason, duplex communication is substantially impossible in base station communication between terminal stations, and simplex communication is performed.

  Patent Document 1 below describes an SCPC digital wireless system based on ARIB STD-T61.

JP 2011-71703 A

In the above-described wireless communication system, for example, when a terminal station is stolen or the terminal station is lost, the contents of communication between other terminal stations may be intercepted by a person who has illegally obtained the terminal station. There is.
The present invention has been made to solve such a problem, and prevents unauthorized interception of communication contents even when the terminal station is stolen or the terminal station is lost. An object of the present invention is to provide a wireless communication system capable of preventing unauthorized use of a terminal station.

A typical configuration of the wireless communication system of the present invention for solving the above-described problems is as follows. That is,
A terminal station having a terminal station storage unit that stores an identifier for identifying the own station; a base station that is wirelessly connected to the terminal station; and a communication console that is connected to the base station and instructs the terminal station An SCPC wireless communication system that assigns one carrier to one channel for transmitting voice data,
The communication console has a communication console operation unit that receives an input from an operator, and when the communication console operation unit receives a function restriction request that restricts the function of a specific terminal station, the identifier of the specific terminal station Including a function restriction request signal including the base station to the terminal station repeatedly,
The terminal station restricts the function of the own station when the identifier of the terminal station included in the function restriction request signal received from the base station matches the identifier of the own station stored in the terminal station storage unit. A function restriction response signal indicating that the function restriction request signal has been received is transmitted to the base station while entering the function restriction state,
When the communication console receives the function restriction response signal via the base station, the communication console stops the repeated transmission of the function restriction request signal.

  According to the above configuration, even if the terminal station is stolen or the terminal station is lost, the function restriction of the terminal station can be reliably performed from the communication console, thereby preventing unauthorized use of the terminal station. be able to.

It is a figure which shows the example of schematic structure of the radio | wireless communications system which concerns on embodiment of this invention. It is a figure which shows the structure of the communication console, line | wire control apparatus, and base station which concern on embodiment of this invention. It is a figure which shows the structure of the portable device which concerns on embodiment of this invention. It is a figure which shows operation | movement when the portable device which concerns on embodiment of this invention receives a function restriction request. It is a figure which shows operation | movement when the portable device which concerns on embodiment of this invention will be in a reset state.

Hereinafter, embodiments of the present invention will be described with reference to FIGS. FIG. 1 is a schematic configuration example of a radio communication system according to the present technical field as described in the background art, and is a diagram illustrating a schematic configuration example of a radio communication system according to an embodiment of the present invention. Description of the points described in the background art is omitted.
In the example of FIG. 1, a control station is configured by the communication console 10, the line control device 20, the base station 30, and the PBX 70, but the communication console 10 forms a control station, and the line control device 20, the base station 30, The PBX 70 may be separated from the control station. A configuration without the PBX 70 is also possible. For example, when there is one base station, the functions of the communication console and the line control device can be incorporated in the base station. Further, the functions of the line control device 20 may be combined as appropriate, for example, by incorporating them into the communication console 10.

In the example of FIG. 1, the number of base stations 30 is one, but may be two or more. Moreover, although the portable device 40 is four, what is necessary is just one or more. Further, the in-vehicle device 50 and the fixed / semi-fixed station 60 may be omitted.
In the example of FIG. 1, individual numbers are assigned to the communication console 10 and each terminal station as identifiers (IDs), and each individual number is stored in the storage unit of the communication console 10 and each terminal station. Has been. For example, the individual number of the communication console 10 is 100, the individual number of the portable device 40 (1) is 401, the individual number of the portable device 40 (2) is 402, and the individual number of the in-vehicle device 50 (1). Is 501 and the individual number of the fixed / semi-fixed station 60 (1) is 601.

In the wireless communication system of this embodiment, when there is a communication request (including a call request) from the communication console 10 to the terminal station, or a communication request (call communication) from the terminal station to the communication console 10 or another terminal station. Emergency transmission that wirelessly communicates communication data such as voice together with a synchronization signal (synchronous burst (SB)) for synchronizing reception between the transmission side and the reception side. The method is used.
The wireless communication system of FIG. 1 is, for example, a fire and ambulance wireless communication system, and the portable device 40 and the vehicle-mounted device 50 are wireless devices mounted on a fire engine or an ambulance, and the base zone has a radius of several kilometers to several It is about 10 km.

FIG. 2 is a block diagram illustrating a schematic configuration of the communication console 10, the line control device 20, and the base station 30 in the embodiment of the present invention.
First, the configuration of the communication console 10 will be described.
The communication console 10 includes a control unit 11, a storage unit 12, a display unit 13, an operation unit 14, a speaker 15 that outputs voice, and a microphone 16 to which an operator's voice is input, which is configured by a CPU (Central Processing Unit) and the like. Composed. The operation unit 14 receives various instructions from the operator. For example, a function restriction request button for giving a function restriction request instruction for restricting the function of the terminal station, or a function for releasing the function restriction of the terminal station. Function restriction release button for instructing restriction release, PTT button for making a call using PTT (Push To Talk), Ending button for ending the call, Dial button for entering individual number of terminal station Etc.

The control unit 11 is connected to each component of the communication console 10 and controls each component. For example, when a function restriction request instruction for restricting the function of the terminal station is received from the operation unit 14, a function restriction request signal is controlled to be transmitted from the base station 30 to the terminal station via the line control device 20. Further, when receiving a function restriction release instruction for releasing the function restriction of the terminal station from the operation unit 14, control is performed such that a function restriction release signal is transmitted from the base station 30 to the terminal station via the line control device 20. .
Further, the function restriction request signal, which is a response to the function restriction request signal from the terminal station via the base station 30, is transmitted intermittently, for example, repeatedly at a constant period, to the terminal station. When the signal is received, control is performed to stop the transmission of the function restriction request signal from the base station 30. Alternatively, the function restriction release response signal that is a response to the function restriction release signal from the terminal station via the base station 30 is transmitted intermittently by repeating transmission of the function restriction release signal to the terminal station. Is received, control is performed to stop transmission of the function restriction release signal from the base station 30.

  The storage unit 12 stores an operation program for the CPU of the control unit 11 to operate. The CPU of the control unit 11 operates by reading the operation program from the storage unit 12. The storage unit 12 stores an individual number 100 that is an identifier (ID) of the communication console 10 and also stores an individual number that is an identifier (ID) of each terminal station.

  The communication console 10 is configured as described above, and gives various instructions to the terminal station via the base station 30. For example, using the microphone 16 and the speaker 15, a call regarding a command to the terminal station is performed with the terminal station via the base station 30. The communication console 10 also receives a function restriction request signal for restricting the function of the terminal station and a function restriction release signal for releasing the function restriction of the terminal station based on an instruction from the operator via the operation unit 14. And the like are transmitted from the base station 30 to the terminal station.

Next, the configuration of the line control device 20 will be described.
The line control device 20 includes a control unit 21 and a storage unit 22 configured by a CPU or the like, and the control unit 21 includes a communication line between terminal stations via the base station 30, and between the terminal station and the communication console 10. The telephone line between the extension telephone via the PBX 70 and the terminal station, the telephone line between the extension telephone via the PBX 70 and the communication console 10, and the like. It performs control such as call control from a station or an extension telephone.
The storage unit 22 of the line control device 20 stores an operation program for operating the CPU of the control unit 21, and the CPU of the control unit 21 operates by reading the operation program from the storage unit 22.

Next, the configuration of the base station 30 will be described.
The base station 30 includes a base station transmission unit 33, a base station reception unit 34, a control unit 31 configured by a CPU and the like, and a storage unit 32. The control unit 31 includes each component of the base station 30 and Connected and controls each component. The storage unit 32 stores an operation program for the CPU of the control unit 31 to operate. The CPU of the control unit 31 reads the operation program from the storage unit 32 and operates.
The base station transmission unit 33 transmits a call signal, a control signal, and the like from the communication console 10 to the terminal station at the radio frequency f2. The base station receiving unit 34 receives a call signal, a control signal, and the like transmitted from the terminal station at the radio frequency f1.

  Next, the configuration of the terminal station will be described. Here, the configuration of the portable device 40 will be described with reference to FIG. 3, but the terminal stations other than the portable device 40 have substantially the same configuration as the portable device 40. FIG. 3 is a block diagram illustrating a schematic configuration of the portable device 40. The portable device 40 shown in FIG. 3 uses a base station wave of a pair of uplink radio carrier (frequency f1) and downlink radio carrier (frequency f2), and can perform simultaneous transmission / reception via the base station 30. Is a wireless communication device. That is, individual communication with the communication console 10 and other terminal stations performed via the base station 30 is performed by duplex using the transmission unit 43 and the first reception unit 44 described later. The portable device 40 is a wireless communication device that directly communicates with other terminal stations by the simplex method without going through the base station 30. That is, direct communication between terminal stations is performed by simplex transmission on a wireless carrier (frequency f3) using a transmission unit 43 and a second reception unit 45 described later.

In FIG. 3, reference numeral 41 denotes a control unit that is connected to each component of the portable device 40 and controls each component. The control unit 41 includes a function restriction response transmission completion waiting timer 41a. The function of the control unit 41 will be described later.
Reference numeral 42 denotes a storage unit connected to the control unit 41. The storage unit 42 stores an operation program for the CPU of the control unit 41 to operate. The CPU of the control unit 41 reads the operation program from the storage unit 42 and operates.
In addition, the storage unit 42 stores an individual number 42a that is an identifier (ID) of the portable device 40 and a function restriction flag 42b. The function restriction flag 42b is turned on when a function restriction request signal for restricting the function of the terminal station is received from the communication console 10, and turned off when a function restriction release signal is received. In the present embodiment, the individual number 42a and the function restriction flag 42b are stored in a nonvolatile memory such as an EEPROM (Electrically Erasable Programmable Read-Only Memory) so that the memory is retained even when the power of the portable device 40 is turned off. It has become.
Note that the function restriction flag 42b may be configured to be turned off by an operation of the operator from the operation unit 83 of the portable device 40. In this case, it is necessary to input from the operation unit 83 a password that enables an operation to turn off the function restriction flag 42b.

  43 is a transmission unit, 44 is a first reception unit that receives a base station wave (frequency f2) from the base station 30, 45 is a second reception unit that receives a direct wave (frequency f3) from another terminal station, and 46 Is an antenna duplexer that separates transmission / reception paths for simultaneous transmission / reception, 47 is an antenna for transmission / reception with the base station 30 and direct communication with other terminal stations, and 49 is a speaker for outputting voice and sound. The transmitter 43, the first receiver 44, and the second receiver 45 are connected to the controller 41 and the antenna duplexer 46, respectively.

In addition, it includes a receiver 81 that outputs sound and sound, a microphone 82 that inputs sound, an operation unit 83 that receives input from an operator, an LCD (Liquid Crystal Display) that performs various displays, an LED (Light Emitting Diode), and the like. However, in the case of an in-vehicle device or a fixed or semi-fixed station, there is a case in which these configurations are connected as a handset separately from the main body. The display unit 84 includes, for example, LEDs each indicating a wireless transmission state and a wireless reception state. The operation unit 83 and the display unit 84 may be integrated with a touch panel, for example.
The speaker 49, the receiver 81, the microphone 82, the operation unit 83, and the display unit 84 are electrically connected to the control unit 41, respectively. A sound signal is transmitted from the control unit 41 to the speaker 49 and the receiver 81, a sound is output from the speaker 49 and the receiver 81, and a sound signal from the microphone 82 is transmitted to the control unit 41.

The operation unit 83 receives various instructions from the operator. For example, a PTT button for making a call using PTT (Push To Talk), an end button for ending the call, the communication console 10, and the like. A dial button for inputting the individual number of the terminal station.
For example, the telephone number is entered or selected by the operation unit 83, the PTT button is pressed once, and a response is received from the other party to enter a call state. When a voice is input from the microphone 82 while the PTT button is being pressed in a call state, the voice signal is transmitted from the transmitter 43 as a call signal. When the call end button is pressed in the call state, the call state ends.

  The control unit 41 encodes the audio signal input from the microphone 82 and outputs the encoded audio signal to the transmission unit 43. Also, the audio signal received by the first receiving unit or the second receiving unit is received, decoded, and output to the speaker 49 or the receiver 81. In addition, the control unit 41 creates a control signal such as a function restriction response signal and outputs the control signal to the transmission unit 43. Further, it receives a control signal such as a function restriction request signal received by the first receiver, and analyzes and processes it. The control unit 41 performs various controls based on the operation input received by the operation unit 83. In addition, various displays are performed on the display unit 84.

In addition, when receiving the function restriction request signal from the communication console 10, the control unit 41 turns on the function restriction flag 42b and sets the function restriction state in which the function of the portable device 40 is restricted. Specifically, when a function restriction request signal is received from the communication console 10 via the base station 30, the individual number of the function restriction target terminal station included in the function restriction request signal is stored in the storage unit 42. If it matches, the transmission unit 43 is instructed to transmit a function restriction response signal, and the function restriction response transmission completion waiting timer 41a is started. When the transmission unit 43 completes transmission of the function restriction response signal or when the function restriction response transmission completion waiting timer 41a times out, the function restriction state is entered.
When the control unit 41 receives a function restriction release signal from the communication console 10 via the base station 30, the control unit 41 turns off the function restriction flag 42b and releases the function restriction of the portable device 40. To.

Here, the function restriction state is a state where at least a part of the functions of the portable device 40 is stopped, and is, for example, at least one of the following (1) to (9). The states (1) to (9) can be appropriately combined with a function restriction state.
(1) The call transmission operation from the portable device 40 is stopped. For example, the operation of the buttons on the operation unit necessary for the call transmission operation is invalidated. As a result, it is possible to prevent unauthorized information such as false information from being transmitted to other terminal stations and communication consoles. In addition, it is possible to prevent other terminal stations from entering a call-disabled state (transmission lock state).
(2) The sound and sound output operations from the speaker and receiver of the portable device 40 are stopped. For example, the operation of the buttons on the operation unit necessary for the call reception operation is invalidated. This can prevent unauthorized interception of communication from other terminal stations and communication consoles.
(3) The display on the LCD of the display unit 84 is changed from the display content so far to a specific content set in advance.
(4) The display content on the LCD is turned off.
(5) Set the LCD display to a frozen state (a fixed state that does not change).
(6) Turn off the LED indicating the wireless transmission state and the LED indicating the wireless reception state.
(7) Set the LED indicating the wireless transmission state and the LED indicating the wireless reception state to the frozen state.
(8) A part or all of the input from the operation unit 83 is invalidated. For example, input of a button necessary for an operation for viewing information such as individual numbers of other terminal stations stored in the storage unit 42 of the portable device 40 is invalidated. However, when the password that enables the operation to turn off the function restriction flag 42b is configured to be input from the operation unit 83, the input of the button used for this operation is validated.
(9) As a function restriction state notification signal for notifying that the function restriction state has been entered, for example, a function restriction response signal is repeatedly transmitted to the communication console 10 via the base station 30 intermittently, for example, at a constant cycle. To do. This signal includes the individual number of the portable device 40 and information indicating that the portable device 40 is in the function restriction state.

  In the present embodiment, when the portable device 40 enters the function restriction state, the control signal transmission / reception function is maintained, but the call transmission operation is stopped, the call reception operation is stopped, and the voice and sound from the speaker and the receiver are stopped. Output function is stopped, the function restriction flag 42b is turned on, the LED indicating the wireless transmission state and the LED indicating the wireless reception state are frozen in the off state, and the LCD display is frozen in the off state. All the inputs from the unit 83 are invalidated, and a function restriction response signal as a function restriction state notification signal is repeatedly transmitted to the communication console 10 via the base station 30 at a constant period. When the function restriction release signal is received from the communication console 10, the transmission of the function restriction response signal is stopped and the function restriction flag 42b is turned off.

  In the portable device 40, the audio signal input from the microphone 82 is encoded by the control unit 41 and subjected to predetermined signal processing for transmission, and then input to the transmission unit 43. The signal input to the transmission unit 43 is subjected to predetermined modulation for transmission, converted to a predetermined transmission frequency f1, and output from the antenna 47 via the antenna duplexer 46, and then transmitted to the base station 30 and other terminal stations. Sent to.

On the other hand, a radio carrier (frequency f 2) from the base station transmission unit 33 of the base station 30 is received by the antenna 47 and input to the first reception unit 44 via the antenna duplexer 46. The signal input to the first receiver 44 is amplified at a high frequency, converted to a predetermined intermediate frequency, further demodulated, and supplied to the controller 41. After predetermined signal processing is performed and decoded by the control unit 41, sound is output from the speaker 49 or the receiver 81.
A radio carrier (frequency f3) by direct communication from another terminal station is received by the antenna 47 and input to the second receiving unit 45 via the antenna duplexer 46. The signal input to the second receiver 45 is amplified at a high frequency, converted to a predetermined intermediate frequency, further demodulated, and supplied to the controller 41. After predetermined signal processing is performed and decoded by the control unit 41, sound is output from the speaker 49 or the receiver 81.

Next, a call operation between terminal stations via the base station according to the present embodiment will be described. Here, as an example, a call operation from the portable device 40 (1) to the vehicle-mounted device 50 (1) shown in FIG. 1 via the base station will be described.
First, the operation unit 83 of the portable device 40 (1) as the transmission source is operated, and for example, the individual number 501 of the other in-vehicle device 50 (1) is input or selected with a dial key or the like, and the PTT button is once pressed. When pressed, the call operation for transmitting the synchronization signal and the individual call signal from the transmission unit 43 is repeated. The individual call signal includes the other party individual number 501 and 401 which is the individual number of the portable device 40 (1) as the transmission source. The individual call signal is received by the base station 30 (1) in the base zone to which the portable device 40 (1) belongs.

  In the base station 30 (1), the received individual call signal is transmitted back from the base station 30 (1) wirelessly, and from the base station 30 (1) via the line control device 20, the communication console 10 and others. Is transmitted to the other base station 30 and transmitted from the other base station 30 by radio.

  The counterpart on-board device 50 (1) that has received the individual call signal from the base station 30 (1) matches the individual number of the other party included in the individual call signal with the individual number of the own station. Perform incoming calls. The terminal station other than the other party and the communication console 10 do not perform the incoming operation of the individual call signal because the other party individual number included in the individual call signal is different from the individual number of the own station. At this time, the terminal station that has received an individual call signal different from the individual number of the own station enters a transmission lock state in which the transmission operation is impossible. However, the communication console 10 does not enter the transmission lock state. The transmission lock state can be recognized by the operator of the terminal station by turning on the LED on the display unit 84 of the terminal station.

  When the other vehicle-mounted device 50 (1) performs a response operation, for example, once the PTT button is pressed, the vehicle-mounted device 50 (1) stops the incoming operation, and the vehicle-mounted device 50 (1) receives a synchronization signal and an individual response signal. Is sent. The individual response signal includes the other party individual number and the transmission source individual number in this case, that is, the individual number 401 of the portable device 40 (1) and the individual number 501 of the in-vehicle device 50 (1). The individual response signal is received by the base station 30 (1) in the base zone to which the in-vehicle device 50 (1) belongs.

  In the base station 30 (1), the received individual response signal is wirelessly returned from the base station 30 (1) and transmitted from the base station 30 (1) to the other base station 30 via the line controller 20. And transmitted back from the other base station 30 by radio.

  When the source portable device 40 (1) receives the individual response signal from the in-vehicle device 50 (1) via the base station 30 (1), the calling device such as ringing is stopped and the in-vehicle device 50 (1). A call state in which call synchronization is established with Since the call state is displayed on the display unit 84 of the portable device 40 (1) and the in-vehicle device 50 (1) by an LED or the like, the operator of the portable device 40 (1) and the in-vehicle device 50 (1) You can know that

When the call state is established, in the transmission source portable device 40 (1), when the PTT button is pressed and voice is input from the microphone 82 in the pressed state, the call signal including the synchronization signal, the individual number signal, and the voice signal Is generated, and the generated call signal is wirelessly transmitted from the transmission unit 43. The individual number signal includes the individual number 401 of the portable device 40 (1) that is the transmission source. In this way, the voice input from the microphone 82 is transmitted when the PTT button is pressed. In addition, it can also comprise so that an individual number signal may be included in a synchronizing signal.
The call signal transmitted from the portable device 40 (1) is received by the base station 30 (1) in the base zone to which the in-vehicle device 50 (1) belongs.

  In the base station 30 (1), the received call signal is wirelessly returned from the base station 30 (1) and transmitted from the base station 30 (1) to the other base station 30 via the line controller 20. Transmitted from the other base station 30 and transmitted by radio.

  In the in-vehicle device 50 (1), the call signal transmitted back from the base station 30 (1) is received by the first receiving unit 44, and is output from the speaker 49 and the receiver 81 through the control unit 41.

In the terminal station other than the portable device 40 (1) and the in-vehicle device 50 (1) in the call state, the return signal is received from the base station 30 (1) and the other base station 30, and the call signal being received is changed. Since the included transmission source individual number is not the same as the transmission source individual number of the own station, it can be recognized that the call signal being received is not a call signal transmitted from the own station to another mobile station.
These other terminal stations are in the transmission lock state, but in the transmission lock state, for example, by performing a monitoring operation such as pressing the PTT button, the audio signal from the portable device 40 (1) is monitored. That is, audio can be output from the speaker 49 or the receiver 81.

  Thereafter, in the in-vehicle device 50 (1), in order to perform a dialogue, for example, when the sound from the transmission source portable device 40 (1) is interrupted, the PTT button is pressed, and the microphone 82 inputs the sound while the PTT is pressed. Then, the call signal including the synchronization signal, the individual number signal, and the voice signal is wirelessly transmitted from the transmission unit 43. The individual number signal includes the individual number 501 of the in-vehicle device 50 (1) that is the transmission source.

The call signal transmitted from the in-vehicle device 50 (1) is received by the base station 30 (1) in the base zone to which the in-vehicle device 50 (1) belongs.
In the base station 30 (1), the received call signal is wirelessly returned from the base station 30 (1) and transmitted from the base station 30 (1) to the other base station 30 via the line controller 20. Transmitted from the other base station 30 and transmitted by radio.
As described above, a call is made between the portable device 40 (1) and the in-vehicle device 50 (1).

  When the call is to be ended, the end of the call is performed by performing an end call operation such as pressing the end call button on the operation unit 83 in the transmission source portable device 40 (1) or the partner in-vehicle device 50 (1) in the call state. A signal is transmitted with the synchronization signal. In the terminal station where the call termination operation has been performed or the terminal station which has received the call termination signal, the call state is canceled and the state before entering the call state is restored.

Next, a control signal transmission / reception operation between the communication console and the terminal station according to the present embodiment will be described. Here, as an example, a control signal transmission / reception operation between the communication console 10 shown in FIG. 1 and the portable device 40 (1) will be described.
First, for example, when a notification that the portable device 40 (1) has been lost is received from another terminal station or a general telephone, the operator of the communication console 10 operates the operation unit 14 of the communication console 10, for example, dialing Input or select 401, which is the individual number of the portable device 40 (1), using a key or the like, and press the function restriction request button. Thereby, the function restriction request instruction is repeatedly transmitted from the communication console 10 to the base station 30 via the line control device 20. Each time the base station 30 receives a function restriction request instruction, the base station 30 wirelessly transmits a function restriction request signal together with a synchronization signal. The function restriction request instruction or the function restriction request signal transmitted from the communication console 10 or the base station 30 includes a partner individual number 401 and 100 that is the individual number of the communication console 10 of the transmission source.
Instead of repeatedly transmitting a function restriction request instruction from the communication console 10 to the base station 30, when the base station 30 receives the function restriction request instruction once, the function restriction request signal is repeatedly transmitted wirelessly. Also good.

  The counterpart portable device 40 (1) that has received the function restriction request signal from the base station 30 has a destination individual number 401 included in the function restriction request signal that matches the individual number 401 of the own station. Recognize that this is a function restriction request.

After the portable device 40 (1) recognizing the function restriction request addressed to the local station places the local station in the function restricted state, the portable device 40 (1) repeatedly transmits a function restriction response signal together with the synchronization signal. The The function restriction response signal also functions as a function restriction state notification signal. The function restriction response signal includes the individual number 100 of the communication console 10 and 401 which is the individual number of the transmission source portable device 40 (1). The base station 30 that has received the function restriction response signal transmits the function restriction response signal to the communication console 10 via the line control device 20.
The communication console 10 that has received the function restriction response signal recognizes that the portable device 40 (1) is in the function restriction state based on the individual number 401 of the portable device 40 (1) included in the function restriction response signal.

When the communication console 10 recognizes that the portable device 40 (1) has entered the function restriction state, the communication console 10 stops repeatedly sending the function restriction request instruction to the base station 30, and the base station 30 transmits the function restriction request signal. To stop. When the base station 30 repeatedly transmits the function restriction request signal in response to a single function restriction request instruction, the communication console 10 transmits the function restriction request signal to the base station 30 via the line control device 20. The base station 30 instructs to stop the repeated transmission and stops the repeated transmission of the function restriction request signal. Even if the transmission of the function restriction request signal is stopped, the repeated transmission of the function restriction response signal from the portable device 40 (1) is continued.
After that, for example, when a notification that the portable device 40 (1) has been found is received by another terminal station or a general telephone, the operator of the communication console 10 operates the operation unit 14 of the communication console 10, for example, dialing Input or select 401, which is the individual number of the portable device 40 (1), using a key or the like, and press the function restriction release button. As a result, a function restriction release instruction is transmitted from the communication console 10 to the base station 30 via the line control device 20. Receiving the function restriction release instruction, the base station 30 wirelessly transmits a function restriction release signal together with a synchronization signal. The function restriction release instruction and the function restriction request signal transmitted from the communication console 10 or the base station 30 include a destination individual number 401 and 100, which is the individual number of the communication console 10 of the transmission source.

The partner mobile device 40 (1) that has received the function restriction release signal from the base station 30 has the destination individual number 401 included in the function restriction release signal coincident with the individual number 401 of the own station. Recognizing that the function restriction is released, the local station is put into the function restriction release state, and the repeated transmission of the function restriction response signal (function restriction state notification signal) is stopped.
Note that when the communication console 10 repeatedly transmits a function restriction release signal from the base station 30 and the portable device 40 (1) receives the function restriction release signal, it wirelessly transmits a function restriction release response signal to the base station 30, When the communication console 10 receives the function restriction release response signal via the base station 30, the communication console 10 may be configured to stop transmission of the function restriction release signal. In this way, it is possible to reliably release the function restriction.

Next, in this embodiment, an operation when the portable device 40 receives a function restriction request will be described with reference to FIG. FIG. 4 is a diagram illustrating an operation when the control unit of the portable device according to the present embodiment receives a function restriction request.
First, when the control unit 41 of the portable device 40 receives information indicating that the function restriction request signal from the communication console 10 has been received from the first receiving unit 44 (step S41), the own station is the target station for the function restriction request. It is determined whether or not (step S42). Specifically, it is determined whether or not the individual number of the target station included in the function restriction request signal from the communication console 10 matches the portable device individual number 42a stored in the storage unit 42 of the own station. . If they do not match, that is, if the own station is not the target station for the function restriction request (No in step S42), the function restriction request message is discarded (step S48), and the process ends.

  If the own station is the target station for the function restriction request (Yes in step S42), the control unit 41 turns on the function restriction flag 42b (step S43), and sends a transmission request for the function restriction response signal to the transmission unit 43. (Step S44) and the function restriction response transmission completion waiting timer 41a is set (step S45). The transmission unit 43 wirelessly transmits a function restriction response signal, and when the transmission of the function restriction response signal is completed, transmits information indicating that the transmission of the function restriction response signal is completed to the control unit 41. In the present embodiment, the control unit 41 repeatedly sends a function restriction response signal transmission request to the transmission unit 43, and the transmission unit 43 transmits the function restriction response signal each time.

  When the control unit 41 receives information indicating that the transmission of the function restriction response signal is completed from the transmission unit 43 or when the function restriction response transmission completion waiting timer 41a times out (Yes in step S46), the control unit 41 A reset process is performed (step S47), and the process ends. Here, the reset process is to set the operation state of the portable device 40 to the initial state when the power is turned on.

Next, in this embodiment, the operation when the portable device 40 is in a reset state will be described with reference to FIG. FIG. 5 is a diagram illustrating an operation of the control unit 41 when the portable device 40 is in a reset state.
When the control unit 41 enters the reset state, the control unit 41 activates various tasks for initializing the portable device 40 (step S51).

  Next, the control unit 41 determines whether or not the function restriction flag 42b is on (step S52). If the function restriction flag 42b is in the off state, the normal mode that is not in the function restriction state is entered (step S53), and this process ends. In the normal mode, normal functions such as a call between terminal stations are executed.

  If the function restriction flag 42b is in the on state, the function restriction mode, which is the function restriction state, is entered (step S54), and this process ends. In the function restriction mode, the transmission / reception function of the control signal is maintained, but the call transmission operation is stopped, the call reception operation is stopped, the sound and sound output operation from the speaker and the receiver is stopped, and the wireless transmission state is changed. The LED indicating the wireless reception state and the LED indicating the wireless reception state are frozen in the off state, the display on the LCD is frozen in the off state, all the inputs from the operation unit 83 are invalidated, and the function restriction as a function restriction state notification signal A response signal is transmitted to the communication console 10 via the base station 30 at a fixed period. When the function restriction release signal is received from the communication console 10, the transmission of the function restriction response signal is stopped and the function restriction flag 42b is turned off.

According to the present embodiment, at least the following effects (1) to (6) can be obtained.
(1) A function restriction request signal is repeatedly transmitted from a communication console to a terminal station subject to function restriction, and the terminal station that has received the function restriction request signal transmits a function restriction response signal to the communication console. When the function restriction response signal is received, repeated transmission of the function restriction request signal is stopped, so that the terminal station can be surely placed in the function restriction state.
Therefore, even if the terminal station is stolen or the terminal station is lost, unauthorized use of the terminal station can be prevented, and transmission of unauthorized information or leakage of confidential information such as the operating status of the wireless communication system can be prevented. Can be prevented. For example, in a fire and emergency wireless communication system, it is possible to prevent interception of information that should be concealed, such as the address of a disaster site, damage status, victim's name, and personal information of disaster status.

(2) Since the terminal station that has entered the function restriction state repeatedly transmits a function restriction state notification signal including the identifier of the terminal station and information indicating that the function restriction state has been entered, to the communication console. It becomes easy to search for the location of the terminal station.
(3) The terminal station has a function restriction flag in the non-volatile memory. When the function restriction flag is on, the terminal station is set to the function restriction state. When the function restriction flag is off, the terminal station functions. Since the normal state is not restricted, the function restricted state can be maintained even if the power supply of the terminal station is once cut off, for example, even when a battery for supplying power to the terminal station is removed.
(4) When the terminal station is in the function restriction state, if the function restriction release signal is received from the communication console, the function restriction state of the terminal station is released. For example, when a lost terminal station is found. The terminal station can be returned to the operating state.

(5) When the terminal station is in a function-restricted state, the LCD display on the display unit is turned off, the LED indicating the wireless transmission state of the terminal station and the LED indicating the wireless reception state are turned off, and both are set in a frozen state. Therefore, it can be assumed that the terminal station is not operating. Therefore, for example, since it is not necessary for the unauthorized acquirer of the terminal station to notice that the function restriction state notification signal is transmitted, the function restriction state notification signal can be repeatedly transmitted to the communication console. . Note that the wireless transmission state and the wireless reception state are, for example, a state in which the terminal station is transmitting or receiving a control signal or an audio signal with a communication console or another terminal station.
(6) Since the input from the terminal station operation unit is invalidated when the terminal station is in the function restriction state, it is easy to prevent unauthorized use of the terminal station.

In addition, this invention is not limited to the said embodiment, It cannot be overemphasized that it can change variously in the range which does not deviate from the summary.
In the embodiment, the individual number is used as the identifier (ID) of the communication console or terminal station. However, the identification number is not limited to the individual number as long as the communication console or each terminal station can be identified.
In addition, the present invention is understood not only as a system for executing processing according to the present invention, but also as an apparatus and method, a program for realizing such a method and system, and a recording medium for recording the program. can do.
Further, the present invention may be configured such that the CPU performs control by executing a control program stored in a memory, or may be configured as a hardware circuit.

The present specification includes at least the following configurations.
The first configuration is
A terminal station having a terminal station storage unit that stores an identifier for identifying the own station; a base station that is wirelessly connected to the terminal station; and a communication console that is connected to the base station and instructs the terminal station An SCPC wireless communication system that assigns one carrier to one channel for transmitting voice data,
The communication console has a communication console operation unit that receives an input from an operator, and when the communication console operation unit receives a function restriction request that restricts the function of a specific terminal station, the identifier of the specific terminal station Including a function restriction request signal including the base station to the terminal station repeatedly,
The terminal station restricts the function of the own station when the identifier of the terminal station included in the function restriction request signal received from the base station matches the identifier of the own station stored in the terminal station storage unit. A function restriction response signal indicating that the function restriction request signal has been received is transmitted to the base station while entering the function restriction state,
When the communication console receives the function restriction response signal via the base station, the communication console stops the repeated transmission of the function restriction request signal.

The second configuration is
A wireless communication system in the first configuration,
The terminal station that has entered the function restriction state repeatedly wirelessly transmits a function restriction state notification signal including an identifier of the terminal station and information indicating that the function restriction state has been entered to the base station. Wireless communication system.
The function restriction state notification signal may be the same signal as the function restriction response signal.

The third configuration is
A wireless communication system in the first configuration or the second configuration,
The terminal station storage unit has a function restriction flag composed of a nonvolatile memory. When the terminal station enters the function restriction state, the function restriction flag is turned on and the terminal station is powered on. When the function restriction flag is on, the wireless communication system is characterized in that the terminal station is placed in a function restriction state.

The fourth configuration is
A wireless communication system according to the first configuration to the third configuration,
When the communication console operation unit receives a function restriction release instruction for releasing the function restriction of a specific terminal station, the communication console receives a function restriction release signal including an identifier of the specific terminal station from the base station. To the terminal station,
When the terminal station identifier included in the function restriction release signal received from the base station matches the terminal station identifier stored in the terminal station storage unit, the terminal station sets the function restriction state of the terminal station. A wireless communication system characterized by being released.

The fifth configuration is
A wireless communication system in the fourth configuration,
The wireless communication system, wherein the terminal station stops the repeated transmission of the function restriction state notification signal when the function restriction state of the own station is released.

The sixth configuration is
A wireless communication system according to the first configuration to the fifth configuration,
The terminal station has a terminal station display unit that displays wireless transmission / reception state information indicating a wireless transmission state and a wireless reception state of the terminal station, and displays the wireless transmission / reception state information when the function is restricted. A wireless communication system characterized in that it is not displayed on the part.

The seventh configuration is
A wireless communication system according to the sixth configuration,
The wireless communication system, wherein the terminal station does not display any information on the terminal station display unit when the function restriction state is entered.

  1 ·· Base zone, 4, 5, 6 ·· Transmission path 10 ·· Communication console, 11 ·· Communication console control unit, 12 ·· Communication console storage unit, 13 ·· Communication console display unit, 14 ·· Communication Console operation unit, 15 ·· Speaker, 16 ·· Mic, 20 ·· Line control device, 21 ·· Line control device control unit, 22 ·· Line control device storage unit, 30 ·· Base station, 31 ·· Base station Control unit 32 .... Base station storage unit 33 ... Base station transmission unit 34 ... Base station reception unit 40 ... Portable device 41 ... Portable device control unit 41a ... Wait for completion of function restriction response transmission Timer, 42.. Portable device storage unit, 42 a .. portable device individual number, 42 b... Function restriction flag, 43... Transmission unit, 44... First reception unit, 45. Antenna duplexer, 47 ・ ・ Antenna, 49 ・ ・ Speaker, 50 ・ ・ In-vehicle device, 60 ・ ・ Fixed / Semi-solid Bureau, 70 ... PBX, 81 ... receiver, 82 ... microphone, 83 ... portable device operating unit, 84 ... portable device display.

Claims (3)

A terminal station having a terminal station storage unit that stores an identifier for identifying the own station; a base station that is wirelessly connected to the terminal station; and a communication console that is connected to the base station and instructs the terminal station An SCPC wireless communication system that assigns one carrier to one channel for transmitting voice data,
The communication console has a communication console operation unit that receives an input from an operator, and when the communication console operation unit receives a function restriction request that restricts the function of a specific terminal station, the identifier of the specific terminal station Including a function restriction request signal including the base station to the terminal station repeatedly,
The terminal station restricts the function of the own station when the identifier of the terminal station included in the function restriction request signal received from the base station matches the identifier of the own station stored in the terminal station storage unit. A function restriction response signal indicating that the function restriction request signal has been received is transmitted to the base station while entering the function restriction state,
When the communication console receives the function restriction response signal via the base station, the communication console stops the repeated transmission of the function restriction request signal. A wireless communication system according to claim 1, wherein
The terminal station that has entered the function restriction state repeatedly wirelessly transmits a function restriction state notification signal including an identifier of the terminal station and information indicating that the function restriction state has been entered to the base station. Wireless communication system. The wireless communication system according to claim 1 or 2,
The terminal station storage unit has a function restriction flag composed of a nonvolatile memory. When the terminal station enters the function restriction state, the function restriction flag is turned on and the terminal station is powered on. When the function restriction flag is on, the wireless communication system is characterized in that the terminal station is placed in a function restriction state.

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