JP2007053572A - Radio communication system and radio communication method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a radio communication system and a radio communication method which are simle in the reception of broad cast notification and excellent in immediacy. <P>SOLUTION: In the radio communication system, which is composed of a control station having a command console, a base station connected to the control station and a plurality of mobile stations, the control station has a processor and a storage section, and the base station has a first radio set for transmission, a first radio set for reception, and a second radio set for transmission for transmission to and reception from the plurality of mobile stations; and the second radio set for transmission is configured to send out a disturbance signal disturbing communication between radio sets performing inter-mobile-station direct communication among the plurality of mobile stations in response to a command from the command console. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a radio communication system and a radio communication method, and more particularly, to a radio communication system and a radio communication method capable of receiving an emergency broadcast message also by a mobile station that is talking to a mobile station outside the service area.

  One of the digital radio systems currently in practical use is a mobile communication system defined by the standard ARIB STD-T79 (Association of Radio Industries and Businesses-T79) (for example, see Non-Patent Document 1). . FIG. 4 is a diagram showing a schematic configuration of a public municipal digital mobile communication system. This public municipal digital mobile communication system shows a minimum system configuration example. One base station covers a mobile station operation area with one base station. It adds a direct communication function. Therefore, in general, a system composed of a plurality of base stations, relay stations, and a large number of mobile stations is common, but for the sake of convenience of explanation, description will be made with reference to FIG. 4 having the simplest configuration.

  4, a plurality of mobile stations 403-1, 403-2, 403-3,... In a communication area 405 (also referred to as a communication zone) between a control station 401 and a base station 402 (also referred to as a control station). A communication connection service for direct communication between 403-N and a base station or between mobile stations via a base station or between mobile stations, or a mobile station 403-4 outside the communication area 405 and a mobile station 403 in the communication area 405 -N is a system configured to perform a communication connection service with N. Note that the control station 401 may be installed in the vicinity of the base station 402, or may be installed in a place distant from the place. In this case, the control station 401 and the base station 402 are generally connected by a transmission line 404 such as a wired or micro line. In the following description, the mobile stations 403-1, 403-2, 403-3, 403-4,... 403-N are collectively referred to as the mobile station 403. Here, although described as a mobile station, the mobile station includes a radio device, a portable radio device, an information terminal station, or the like mounted on a vehicle or the like.

  The control station 401 maintains and manages a communication connection and a service area between the base station 402 and the plurality of mobile stations 403 in the digital wireless communication system. The control station 401 is provided with a line control device, and performs a call control from a mobile station or a control for setting a communication route.

  Thus, FIG. 5 shows radio carrier frequency allocation permitted for use in a public municipal digital mobile communication system using digital radio technology defined by the standard ARIB STD-T79. In FIG. 5, 112 waves (f1, f2,...) Having a width of 25 KHz and a radio carrier f of about 262 MHz to 266 MHz are recognized in the uplink direction, that is, in the direction from the mobile station to the base station. Further, in the downlink direction, that is, in the direction from the base station to the mobile station, a radio carrier F of about 271 MHz to 275 MHz, which is 9 MHz away from 262 MHz in the uplink direction, has a width of 25 KHz and 112 waves (F1, F2,...). It recognized. Accordingly, in the communication of the digital wireless communication system, the frequencies in the upstream direction f1, f2,..., The downstream directions F1, F2,. Each system can use one or a plurality of radio carriers according to the scale. Further, in the standard ARIB STD-T79, the radio carrier W is set so that the mobile stations 403-4 and 403-N located between the mobile stations, for example, outside the communication area 405, can directly communicate with each other. It recognized. This wireless carrier W also has a bandwidth of 25 KHz, and a dozen waves (W1, W2,...) Are recognized.

  Further, each radio carrier is divided into frames as shown in FIG. 6, and the frame is further divided into four slots, and then a control channel C and a communication channel S are allocated to the slots. Here, one frame is 40 ms, for example. The control channel C is a channel for performing connection control of a wireless line, and the communication channel S is a channel for performing a telephone call and data communication. A carrier including one or more control channels is referred to as a control carrier, and a carrier constituted only by communication channels is referred to as a communication carrier.

  FIG. 7 shows a frame configuration of a control channel (hereinafter referred to as a control ch) defined in the standard ARIB STD-T79, and FIG. 7A shows the downlink direction, that is, from the base station. A control channel in the mobile station direction is shown, and FIG. 7B shows a communication channel in the downlink direction.

  In the mobile communication system as described above, simultaneous notification is performed in the case of a disaster warning or other emergency, and the operation of simultaneous notification in that case will be described with reference to FIG. In FIG. 8, the control station 401 always transmits an empty line signal to each mobile station 403 at a predetermined cycle (step 801). As a result, the control station 401 and each mobile station 403 located in the communication area 405 Are synchronized. In this description, the control station 401 is described. However, the control station 401 and the base station 402 may be configured integrally. A dotted line 809 indicates a state in which the base station 401 and a plurality of mobile stations 403 can communicate. For example, the mobile station 403 -N and the mobile station 403-4 typically indicate a state in which communication with the base station 401 is not possible. Represents.

  Next, when the control station 401 makes a simultaneous notification, a “broadcast” button is pressed on the display screen of a command console (not shown) of the control station 401. When this “broadcast” button is pressed, the control station 401 uses the control channel C general call channel PCH (which will be described later) to all mobile stations 403 including mobile stations already in communication. A simultaneous report is made (step 802). It should be noted that in the simultaneous notification, there are a case where all mobile stations of the mobile communication system are notified collectively and a case where a specific group is notified. When making a broadcast to a specific group, it is sent with a group number identification signal, for example, an appropriate group identification signal of 00 to 99, so that only a specific group receives the broadcast message 802. It has become. In addition, a switching signal to a designated call channel, for example, F1 is attached to this simultaneous notification.

  The mobile station 403-1 that has received the broadcast report switches to the communication channel S, for example, the communication channel S3 (shown in FIG. 6) based on the switching signal F1 to the designated call channel (step 803). . Then, the mobile station 403-1,... Transmits emergency notification contents such as tsunami information and evacuation information transmitted from the control station 401 via the communication channel S3 (signal format shown in FIG. 7B). Disaster information is received (step 804). Accordingly, the mobile station 403-1,... That has received the contents of the simultaneous notification can hear emergency disaster information from the speaker. In the case of text information, the emergency information displayed on the display device of the mobile station 403 is displayed. It is possible to visually check disaster information.

  The mobile station 403-1,... That receives the broadcast content 804 receives and registers that it has received the broadcast content in its own storage unit (step 805).

  Next, the control station 401 uses the communication channel S, for example, the communication channel S2, to confirm whether or not the contents of the simultaneous notification have been received by all the mobile stations 403 after a predetermined time has elapsed. (Step 806). Note that the “after a predetermined time has elapsed” is a time sufficient for the operator of the mobile station 403 to register an order, for example, after a few seconds.

  Confirmation of an acceptance response from the control station 401 is performed by a well-known polling method, for example. That is, the control station 401 inquires by polling whether or not the contents of the simultaneous notification are received and registered in the storage unit of the mobile station 403-1,... Using the communication channel S3 (step 806). For a plurality of mobile stations 403-1,..., For example, the presence / absence of acceptance registration is confirmed in the order of the numbers of the mobile stations, such as mobile stations 403-1, 403-2,.

  The mobile station 403-1,... That has received the polling signal for the presence / absence of acceptance registration transmits a flag of a confirmation signal for acceptance registration to the control station 401 (step 807). As described above, in the digital mobile communication system, simultaneous calling, emergency disaster information notification, reception confirmation, and the like are performed.

  As described above, mobile stations located in the communication area 405 such as the mobile stations 403-1, 403-2, 403-3,... Communicate with each other through the base station 402. The mobile station that is performing communication is also forcibly disconnected, and a simultaneous notification is immediately received in response to the simultaneous notification in the control station 401, the designated call channel is switched, and emergency disaster information can be received. . However, when the mobile station 403-N located in the communication area 405 is directly communicating with the mobile station 403-4 located outside the communication area 405 as shown in FIG. 8 (step 808), the mobile station 403-N cannot receive the simultaneous notification from the control station 401. That is, as shown in FIG. 5, between the base station and the mobile station, the radio carrier f is used in the uplink direction and each radio carrier of the radio carrier F is used in the downlink direction. In direct communication, a radio carrier W different from the radio carriers f and F is used. Therefore, the mobile station 403-N that performs direct communication between the mobile stations cannot receive the broadcast message from the control station 401, and the mobile station 403-N receives the broadcast message until the direct communication between the mobile stations is completed. Can not.

  Thus, in the mobile communication system described above, emergency disaster information such as tsunami information and evacuation information is transmitted to the mobile station that has received the simultaneous notification. It is possible to respond to evacuation guidance, recovery activities, etc. based on the above, but local government officials who have not received simultaneous reports, disaster prevention agency staff, etc. cannot know emergency disaster information. Thus, for example, the disaster prevention center staff confirms the response to an order from a mobile station that has received a general report, and uses a telephone line or a communication line for each mobile station that does not receive an order response. Currently, emergency disaster information is communicated. In addition, the control station 401 periodically sends an emergency broadcast signal when an emergency broadcast is issued, and shifts from outside the communication area 405 of the base station 402 to the base station communication area during the emergency broadcast. Mobile stations can receive emergency broadcasts.

  However, this method is inadequate as a mobile communication system that enables emergency disaster information because it takes too much time for individual communication when there are a large number of mobile stations that have not been confirmed and can be trusted. Moreover, it is desired to realize a mobile communication system that can quickly transmit emergency disaster information to as many mobile stations as possible.

  In addition, a broadcast report calling method (see, for example, Patent Document 1) discloses a technique in which a master station quickly starts a broadcast to the terminal station when the master station starts the broadcast to the terminal station. Has been.

JP 2001-313603 A Standard ARIB STD-T79: Municipal digital mobile communication system TYPE1, The Japan Radio Industry Association

  In the conventional method described above, the contents of emergency broadcasts can be received by most mobile stations in the communication area of the base station, but are not forcibly disconnected when communicating using direct communication waves. Therefore, the emergency simultaneous communication cannot be received until the call is finished.

  An object of the present invention is to provide a radio communication system and a radio communication method that are simple to receive a broadcast message and excellent in urgency.

  Another object of the present invention is to provide a radio communication system and a radio communication method capable of reliably transmitting a simultaneous report to a mobile station located in a base station area.

  Still another object of the present invention is to provide a wireless communication system and a wireless communication method capable of receiving an emergency broadcast message even for a mobile station performing direct communication.

  The present invention provides a radio communication system comprising a control station having a command console, a base station coupled to the control station, and a plurality of mobile stations, wherein the control station includes a processing device and a storage unit, , Having a first transmission radio, a first reception radio, and a second transmission radio for transmitting / receiving to / from the plurality of mobile stations, and based on an instruction from the command console, The transmitting radio device is configured to transmit an interference signal that interferes with communication of a mobile station that performs direct communication between mobile stations among the plurality of mobile stations.

  In the radio communication system of the present invention, the first transmission radio and the second transmission radio have different frequencies.

  Further, in the radio communication system of the present invention, the storage unit of the control station stores a frequency of a predetermined radio carrier for performing direct communication between the mobile stations, and among the plurality of mobile stations, between the mobile stations. The interference signal that interferes with the communication of a radio that is performing direct communication is a predetermined radio carrier frequency for performing direct communication between the mobile stations stored in the storage unit based on an instruction from the command console. Is the same frequency signal.

  Furthermore, the wireless communication method of the present invention is a wireless communication system comprising a control station having a command console, a base station coupled to the control station, and a plurality of mobile stations, wherein the control station moves from the base station to the plurality of mobile stations. When transmitting broadcast information to a station using a predetermined radio carrier frequency, the control station is configured to transmit an interference signal from the base station using a radio carrier frequency different from the radio carrier frequency. .

  In the wireless communication method of the present invention, when the control station transmits broadcast information from the base station to the plurality of mobile stations using a predetermined wireless carrier frequency, the base station transmits the jamming signal. Thereafter, the broadcast information is transmitted after a predetermined time.

  In the radio communication method of the present invention, the interference signal is the same radio carrier as a radio carrier used by a mobile station that performs direct communication between mobile stations among the plurality of mobile stations.

  As described above, according to the present invention, it is possible to realize a radio communication system that is easy to receive a simultaneous report and excellent in urgency. In addition, since a wireless communication system can be configured to reliably transmit a broadcast message to a mobile station located in the base station area, particularly a mobile station that is directly communicating, it is suitable for a municipal digital mobile communication system for public use. The effect is great.

  An embodiment of the present invention will be described with reference to FIGS. The configuration of the wireless communication system is the same as the system configuration shown in FIG. FIG. 1 shows a control station 101 and a base station 102 according to an embodiment of the present invention. Note that the control station 101 and the base station 102 correspond to the control station 401 and the base station 402 shown in FIG.

  The control station 101 includes a control device 103 and a command console 104, and maintains and manages a communication connection and a service area between the base station 102 and a plurality of mobile stations. The control station 101 is provided with a processing device (line control device) 105 for performing control such as call control from a mobile station, setting of a communication route, or calling of a general call. The command console 104 includes an operation console 107 and a display unit 108.

  The base station 102 is provided with a receiving radio 109 (referred to as a first receiving radio) and a transmitting radio 110 (referred to as a first transmitting radio) for communicating with the mobile station 403. However, a transmission radio 111 (referred to as a second transmission radio) is further provided. Note that the mobile communication system to which this is applied uses digital radio technology defined in the standard ARIB STD-T79 (see, for example, Non-Patent Document 1) as in the conventional mobile communication system shown in FIG. A radio carrier frequency allocation (shown in FIG. 5) and a frame configuration (shown in FIG. 7) that are permitted to be used in the regional disaster prevention system are used, and detailed description thereof is omitted here.

  The reception radio 109 receives the uplink radio carrier f from the mobile station located in the communication area 405, and the transmission radio 110 transmits the downlink radio carrier F to the mobile station located in the communication area 405. It is a radio that transmits. On the other hand, the transmission wireless device 111 is a wireless device that transmits an interference wave, and for example, transmits a wireless carrier W from the base station 102. That is, the wireless device transmits a wireless carrier W for direct communication between mobile stations, for example, the same wireless carrier as the wireless carrier W1.

  FIG. 2 is a block diagram illustrating a schematic configuration of the mobile station 403. The mobile station shown in FIG. 2 uses, for example, a pair wave of an uplink radio carrier f1 and a downlink radio carrier F1 and can transmit and receive simultaneously, and a radio carrier W for direct communication between mobile stations. For example, a wireless communication apparatus capable of communicating with a mobile station located outside the communication area 405 by the wireless carrier W1 is shown. In FIG. 2, 201 is an antenna for performing transmission / reception with the base station 102, 202 is a high-speed switch for simultaneous transmission / reception, 203 is a reception unit, 204 is a reception signal processing unit, and 205 is A speaker, 206 is a control unit, 207 is a storage unit, 208 is a display unit, 209 is an operation unit, 210 is a microphone, 211 is a transmission signal processing unit, and 212 is a transmission unit.

  In the operation of the wireless communication apparatus, first, the operation unit 209 is operated, for example, the other party's mobile station number is input using a numeric keypad, and a call button is pressed. Since the transmission state is entered when the other party leaves, the audio signal input from the microphone 210 is input to the transmission unit 212 after being subjected to predetermined signal processing for transmission by the transmission signal processing unit 211. The signal input to the transmission unit 212 is subjected to predetermined modulation for transmission, converted to a predetermined transmission frequency f1, output from the antenna 301 via the changeover switch 202, and received by the receiving radio 109 of the base station 102. Sent to.

  On the other hand, a signal from the partner mobile station is received by the antenna 201 and input to the receiving unit 203 via the changeover switch 202. The signal input to the reception unit 203 is amplified at a high frequency, converted to a predetermined intermediate frequency, further demodulated, and supplied to the reception signal processing unit 204. The reception signal processing unit 204 outputs an audio signal from the speaker 205 after predetermined signal processing. In the case of data, the data is displayed on the display unit 208.

  When the mobile station 403 performs direct communication between mobile stations, the operator operates the operation unit 209 to select a wireless carrier W for direct communication, for example, an allowed wireless carrier W1. The wireless carrier W1 can be used to talk to the other mobile station. In this case, the wireless carrier W1 stores the wireless carrier permitted in advance in the storage unit 207. Note that, for example, when a call is made by FDMA (Frequency Division Multiple Access) with one wave of the wireless carrier W1, the call is made by a well-known press talk method. In the case of TDMA (Time Division Multiple Access), simultaneous two-way communication is possible. However, in any case, it goes without saying that the mobile station operates in synchronization with the other mobile station. In this case, for example, the synchronization method generally operates in synchronization with the synchronization signal of the calling mobile station in direct communication between mobile stations.

  Next, simultaneous notification of the mobile communication system of the present invention will be described with reference to FIG. First, the control station 101 always transmits an empty signal (step 301) from the processing device 105 to each mobile station 403 via the transmission radio 110 at a predetermined cycle, whereby the control station 101 and each mobile station 403 are transmitted. And is synchronized. A dotted line 302 is shown to distinguish between a mobile station that can receive an empty line signal from the transmitting radio 110 and a mobile station that cannot receive it.

  In step 304, the mobile station 403 -N located within the communication area of the base station 101 and the mobile station 403-4 located outside the communication area of the base station 101 at this time point are direct communication waves between mobile stations, that is, wireless The case where it communicates using the carrier W1 is shown. Therefore, in this state, the mobile station 403-N cannot communicate with the base station 101, and cannot receive emergency information such as a simultaneous report from the base station 101, for example.

  Step 305 shows a jamming signal transmission step. For example, in the control station 101, the interference signal transmission is a movement in which the operator operates the operation unit 107 of the command console 104 to activate the processing device 105 and performs direct communication from the transmission radio 111 of the base station 102. A jamming signal is transmitted to a station, for example, the mobile station 403-N.

  This will be described below. This disturbing signal functions to forcibly terminate a call of a mobile station that is directly communicating, for example, the mobile station 403-N, before making a simultaneous report. That is, the communication between the mobile station 403-N and the mobile station 403-4 performing direct communication is interrupted, and the mobile station 403-N is forcibly placed in a standby state. Therefore, the disturbing wave works to disturb the synchronization of communication. As a specific method for disturbing the synchronization, for example, a wireless carrier W1 having the same frequency as the wireless carrier W1 used for direct communication is transmitted from the transmitting wireless device 111. When the wireless carrier W1 is transmitted from the transmitting wireless device 111 to the communication area 405 in this way, the mobile station 403-N using the wireless carrier W1 cannot receive from the mobile station 403-4, and the mobile station The control unit 206 of 403-N determines that there is no communication, ends direct communication, and enters a standby state. This is because the signal of the wireless carrier W1 transmitted from the transmitting wireless device 111 disturbs the synchronization of the mobile station 403-N. In the above-described embodiment, one wave of the wireless carrier W1 has been described. However, a plurality of wireless carriers W1, W2,... May be permitted as described with reference to FIG. In advance, the control station 101 stores a plurality of wireless carriers W1, W2,... Permitted in the storage unit 106, and transmits wireless carriers corresponding to the wireless carriers W1, W2,. As a result, all the mobile stations 403 that are directly communicating in the communication area 405 of the base station 102 are forcibly terminated (step 306), and set to a standby state. The mobile station 403-4 naturally ends the call (step 307).

  Step 308 is a step of calling a simultaneous notification. This step 308 is transmitted from the transmission radio 110 of the base station 102 after a predetermined period T from the interference signal transmission of step 305. The period after the predetermined period T is a period in which the mobile station that performs direct communication determines that there is no communication, ends direct communication, and enters a standby state, and is usually about 1 second to several seconds. Note that the period T can be experimentally determined in advance.

  When the control station 101 makes a simultaneous notification, a “broadcast” button is pressed on the display screen of the display unit 108 of the command console of the control station 101. When this “broadcast” button is pressed, the processing unit 105 of the control station 101 transmits a “broadcast” signal to each mobile station 403 using the control channel C (shown in FIG. 6) (step S1). 308). The format of the downlink control channel at this time is shown in FIG. In FIG. 7A, R is a burst transient response guard time, P is a preamble, CAC is a control signal (including a general call channel PCH), E is a collision control bit, SW is a synchronization word, CI Indicates carrier information, CC indicates a color code (interference countermeasure code), and I indicates an idle bit. Each numerical value represents the number of bits, and is composed of a total of 320 bits. This broadcast message signal includes a signal for switching to a designated communication channel (these are collectively referred to as broadcast message information). The broadcast information is transmitted from the control station 101 to each mobile station 403 through the general call channel PCH of the control signal CAC.

  In step 309, the designated communication channel is switched. That is, in the mobile station 403 that has received the broadcast information, the control unit 206 detects a switching signal from the broadcast information to the designated call channel, and based on this detection signal, the communication channel S, for example, the communication channel S3 (FIG. 6), the reception channel timing of the wireless communication apparatus is switched.

  Thereafter, the control station 101 transmits broadcast information, for example, emergency disaster information such as tsunami information and evacuation information, using the downlink communication channel S3 (step 310). The format of the downlink communication channel in this case is shown in FIG. In FIG. 7B, R is a burst transient response guard time, P is a preamble, TCH is a traffic channel, FACCH is a high-speed associated control channel, SW is a synchronization word, CI is carrier information, and CC is , Color code (interference countermeasure code), SACCH indicates a low-speed associated control channel, RCH indicates a housekeeping channel, and B / I indicates a busy / idle bit. Each numerical value represents the number of bits, and is composed of a total of 320 bits. Then, emergency disaster information such as tsunami information and evacuation information is transmitted from the control station 101 to each mobile station 403 using the traffic channel TCH. The traffic channel TCH has a licensee specific user area defined in the standard ARIB STD-T79, and emergency disaster information is inserted into this area and sent, for example.

  When each mobile station 403 receives this emergency disaster information, the reception signal processing unit 204 can decode the information into voice and listen to the emergency disaster information from the speaker 205. In addition, when the emergency disaster information from the control station 101 includes character information, it is possible to decode the character information and display the emergency disaster information on the display device 208.

  The mobile station 403 that has received the broadcast information receives and registers that it has received the broadcast information in its own storage unit 207 (steps 311 and 312).

  Next, the control station 101 uses the communication channel S, for example, the communication channel S2, to confirm whether or not the broadcast information has been received by all the mobile stations 403 after a predetermined time has elapsed. (Step 313). Note that the “after a predetermined time has elapsed” is a time sufficient for the operator of the mobile station 603 to register an order, for example, after a few seconds. Confirmation of an acceptance response from the control station 101 is performed by a well-known polling method, for example. That is, for example, the control station 101 inquires by polling whether or not the broadcast information has been received and registered in the storage unit 207 of the mobile station 403 using the communication channel S3. For a plurality of mobile stations 403, for example, the presence / absence of registration of orders is confirmed in the order of the mobile station numbers, such as mobile stations 403-1, 403-2,... 403-N.

  The mobile station 403 that has received the polling signal for the inquiry about the presence / absence of the registration of instructions transmits a confirmation signal of the registration of orders to the control station 101 (steps 314 and 315).

  With the above configuration, the mobile station that is directly communicating between the mobile stations within the communication area of the base station can also reliably terminate the call and receive the broadcast information from the base station. Since broadcast information can be transmitted to all mobile stations, a highly reliable broadcast wireless communication system can be realized. In the above-described embodiment, an example has been described in which a broadcast message is transmitted (step 308) after a predetermined period T after transmission of a disturbing signal (step 305). First, send to the mobile station that can receive the broadcast information, then send the jamming signal, terminate the call of the mobile station that is directly communicating, send the broadcast information again, The mobile station may be configured to receive broadcast information. In general, broadcast information is transmitted periodically and repeatedly, so that broadcast information can be received when a mobile station outside the communication area returns to the communication area. Can also be easily implemented.

  Although the present invention has been described in detail above, the present invention is not limited to the embodiments of the mobile communication system and the wireless communication method described herein, and is widely applied to mobile communication systems and wireless communication methods other than those described above. It goes without saying that it can be adapted.

The block diagram of schematic structure of one Example of this invention is shown. The block diagram of schematic structure of the mobile station used for this invention is shown. The flowchart for demonstrating operation | movement of this invention is shown. It is a figure which shows schematic structure of the radio | wireless communications system with which this invention is applied. It is a figure which shows the frequency allocation of the radio carrier defined by standard ARIB STD-T79. It is a figure which shows the frame structure defined by standard ARIB STD-T79. It is a figure which shows the format of the control channel and communication channel which are used by this invention. The flowchart for demonstrating operation | movement of the conventional radio | wireless communications system is shown.

Explanation of symbols

  101, 401: Control station, 102, 402: Base station, 103: Control device, 104: Command console, 105: Processing device, 106, 207: Storage unit, 107, 209: Operation unit, 108, 208: Display unit, 109: reception wireless device, 110, 111: transmission wireless device, 201: antenna, 202: changeover switch, 203: reception unit, 204: reception signal processing unit, 205: speaker, 206: control unit, 210: microphone, 211: transmission signal processing unit, 212: transmission unit, 403: mobile station, 404: transmission path, 405: communication area.

Claims (3)

  In a wireless communication system including a control station having a command console, a base station coupled to the control station, and a plurality of mobile stations, the control station includes a processing device and a storage unit, and the base station includes the plurality of mobile stations. A first transmission radio for transmitting / receiving data to / from the mobile station, a first reception radio, and a second transmission radio, and the second transmission radio based on an instruction from the command console. A radio communication system characterized by transmitting an interference signal that interferes with communication of a mobile station performing direct communication between mobile stations among the plurality of mobile stations.   2. The radio communication system according to claim 1, wherein the storage unit of the control station stores a frequency of a predetermined radio carrier for performing direct communication between the mobile stations, and among the plurality of mobile stations, between the mobile stations. The interference signal that interferes with the communication of a radio that is performing direct communication is a predetermined radio carrier frequency for performing direct communication between the mobile stations stored in the storage unit based on an instruction from the command console. A radio communication system characterized by being a signal having the same frequency as   In a radio communication system comprising a control station having a command console, a base station coupled to the control station, and a plurality of mobile stations, the control station uses a predetermined radio carrier frequency from the base station to the plurality of mobile stations. When transmitting broadcast information, the control station transmits a jamming signal from the base station using a radio carrier frequency different from the radio carrier frequency.

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