Wireless device and control method, program

Abstract

To provide a radio device and a control method that can keep an alarm range within an appropriate range.SOLUTION: A radio device is mounted on a vehicle and comprises receiving means, position information acquiring means, and determining means. The receiving means receives a predetermined radio signal including position information of other vehicles transmitted from other vehicles. The position information acquiring means acquires position information of an own vehicle. The determining means compares the position information of other vehicles and the position information of the own vehicle, and determines, on the basis of comparison results, whether or not to execute a predetermined operation set when the predetermined radio signal is received.SELECTED DRAWING: Figure 5

Description

Technical Field

[0001] The present invention relates to a wireless device, a control method, and a program.

Background Art

[0002] Patent Document 1 describes the following train protection wireless relay system. In the train protection wireless relay system described in Patent Document 1, a protection wireless device that has received a protection transmission signal from a protection wireless device of another train further performs protection relay transmission to another train. According to this configuration, since protection relay transmission can be further performed to another train through other trains, the transmission range of the protection transmission can be expanded to a certain distance range or more.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] In the train protection wireless relay system described in Patent Document 1, there is a problem that, depending on the situation, protection relay transmission may occur continuously multiple times, and the transmission range may not be able to be kept within an appropriate range.

[0005] An object of the present invention is to provide a wireless device, a control method, and a program that solve the above problems.

Means for Solving the Problems

[0006] To solve the above problems, one aspect of the present invention is a wireless device mounted on a vehicle, comprising a receiving means, a location information acquisition means, and a determination means. The receiving means receives a predetermined wireless signal that includes location information of another vehicle transmitted from another vehicle. The location information acquisition means acquires the location information of the own vehicle. The determination means compares the location information of the other vehicle with the location information of the own vehicle and, based on the comparison result, determines whether or not to perform a predetermined operation set when a predetermined wireless signal is received.

[0007] Furthermore, one aspect of the present invention is a method for controlling a wireless device mounted on a vehicle. This control method includes the step of receiving a predetermined wireless signal that includes location information of another vehicle transmitted from another vehicle. This control method also includes the step of acquiring location information of the own vehicle. This control method also includes the step of comparing the location information of the other vehicle with the location information of the own vehicle and determining, based on the comparison result, whether or not to perform a predetermined operation set when the predetermined wireless signal is received.

[0008] Furthermore, one aspect of the present invention is a program to be executed by a computer in a wireless device mounted on a vehicle. The program causes the computer to function as a receiving means for receiving a predetermined wireless signal including location information of another vehicle transmitted from another vehicle, a location information acquisition means for acquiring location information of the own vehicle, and a determination means for comparing the location information of the other vehicle with the location information of the own vehicle and determining whether or not to execute a predetermined operation set when the predetermined wireless signal is received, based on the comparison result. [Effects of the Invention]

[0009] According to each aspect of the present invention, the alarm activation range can be kept within an appropriate range. [Brief explanation of the drawing]

[0010] [Figure 1] This figure shows an example configuration of a train radio system according to an embodiment of the present invention. [Figure 2] This is a block diagram showing an example configuration of a vehicle-mounted radio according to an embodiment of the present invention. [Figure 3] This flowchart shows an example of the operation of a vehicle-mounted radio according to an embodiment of the present invention. [Figure 4] This is a schematic diagram illustrating an example of the operation of a train radio system according to an embodiment of the present invention. [Figure 5] This is a block diagram showing the minimum configuration of a wireless device according to an embodiment of the present invention. [Figure 6] This flowchart shows the minimum configuration of a control method for a wireless device according to an embodiment of the present invention. [Figure 7] This is a block diagram showing a basic configuration example of a computer according to an embodiment of the present invention. [Modes for carrying out the invention]

[0011] Embodiments of the present invention will be described below with reference to the drawings. In each drawing, the same or corresponding components are given the same reference numerals, and their descriptions are omitted as appropriate.

[0012] (Train radio system) Figure 1 shows an example configuration of a train radio system according to an embodiment of the present invention. The train radio system 200 shown in Figure 1 comprises onboard radio units 1-a, 1-b, 1-c, and 1-d, a control console 3, a central unit 4, and base stations 5-x and 5-y. In the example shown in Figure 1, onboard radio units 1-a and 1-b are mounted on the leading or trailing car 10 of train 100-1 traveling on the down or up line of a certain route. Onboard radio units 1-c and 1-d are mounted on the leading or trailing car 10 of train 100-2 traveling on the up or down line of the same route. Onboard radio units 1-a, 1-b, 1-c, and 1-d are connected to onboard antennas 2-a, 2-b, 2-c, and 2-d, respectively. The control console 3 and central unit 4 are installed in a control center that manages train operations. Base stations 5-x and 5-y are installed along the railway line. In the following, when referring to the on-board radio stations 1-a to 1-d collectively, they will be referred to as on-board radio station 1. Similarly, when referring to trains 100-1 to 100-2 collectively, they will be referred to as train 100. Furthermore, when referring to base stations 5-x and 5-y collectively, they will be referred to as base station 5. On-board radio station 1 is one example of the configuration of the radio device according to the present invention.

[0013] The onboard radio 1 has the function of a train protection radio device and the function of enabling radio communication between the crew of train 100 and the dispatcher operating the control console 3. The train protection radio device is a device that transmits and receives radio signals for the purpose of protecting surrounding trains in the event of an emergency such as an accident or malfunction. The function for enabling radio communication can be the same as that of an existing system. The onboard radio 1 communicates with the control console 3 via the base station 5 and the central unit 4. The base station 5 has the function of communicating wirelessly with the onboard radio 1 and the function of communicating via wired connection with the central unit 4, and relays communication between the onboard radio 1 and the central unit 4. The central unit 4 controls communication between the control console 3 and the multiple base stations 5.

[0014] In this embodiment, the signal transmitted and received by the on-board radio 1 as a train protection radio device is called a protection signal. The operation of the on-board radio 1 to transmit a protection signal is called a protection alert. The operation of the on-board radio 1 to issue an alarm when it receives a protection signal is called a protection alert reception operation. The signal transmitted and received between the on-board radio 1 and the base station 5 is called a train radio signal. In this embodiment, the protection signal includes the location information of the on-board radio 1 that first issued the protection alert, as will be explained below.

[0015] (Configuration of the on-board radio) Figure 2 is a block diagram showing an example configuration of the on-board radio 1. The on-board radio 1 can be configured using, for example, one or more computers and peripheral devices such as a radio device, controls, a handset, a speaker, a microphone, indicator lights, and a satellite positioning system receiver. Furthermore, the on-board radio 1 has a functional configuration consisting of hardware such as computers and peripheral devices, and software such as programs executed by the computers, as shown in Figure 2. Specifically, the on-board radio 1 shown in Figure 2 has a functional configuration consisting of a location information acquisition unit 11, a receiving unit 12, a transmitting unit 13, a determination unit 14, a command and communication unit 15, and an input / output unit 16.

[0016] The position information acquisition unit 11 includes, for example, a satellite positioning signal receiving device such as GPS (Global Positioning System) and an antenna, and acquires the measurement result of the position information (longitude and latitude) of the current position of the on-board radio 1 using the satellite positioning system. Note that the position information acquisition unit 11 is not limited to acquiring position information using the satellite positioning system, but may also acquire position information by, for example, attaching a device that can transmit detailed position information from near the railway tracks to the on-board radio 1.

[0017] The receiving unit 12 receives the protection signal transmitted by the other on-vehicle radio 1. When the receiving unit 12 receives the protection signal, during the period of reception, it continuously outputs a signal indicating that it is in the process of reception to the determination unit 14 and the like. Further, the receiving unit 12 demodulates the position information included in the received protection signal from the received protection signal, and outputs the demodulated position information to the transmission unit 13, the determination unit 14, and the like. Also, the receiving unit 12 outputs a signal indicating the level of the received protection signal to the determination unit 14 and the like.

[0018] The transmission unit 13 transmits a predetermined protection signal in accordance with the instruction from the input / output unit 16 until the instruction for transmission is canceled when transmission is instructed. At that time, the transmission unit 13 modulates the protection signal with the position information acquired by the position information acquisition unit 11, includes the position information of the own vehicle 10 in the protection signal, and transmits the protection signal including the position information of the own vehicle 10.

[0019] Also, the transmission unit 13 transmits a predetermined protection signal in accordance with the instruction from the determination unit 14 until the instruction for transmission is canceled when transmission is instructed. At that time, the transmission unit 13 modulates the protection signal with the position information of the other vehicle 10 demodulated from the protection signal transmitted from the other on-vehicle radio 1 by the receiving unit 12, includes the position information of the other vehicle 10 in the protection signal, and transmits the protection signal including the position information of the other vehicle 10.

[0020] That is, when the transmission unit 13 first transmits the protection signal, it transmits the protection signal including the position information of the own vehicle 10. Also, when the transmission unit 13 receives the protection signal transmitted from the other on-vehicle radio 1 and relays and transmits it, it directly includes the position information of the other vehicle 10 included in the received protection signal in the protection signal to be transmitted.

[0021] First, the determination unit 14 determines whether the receiving unit 12 has received a protective signal transmitted by another vehicle-mounted radio 1. If the receiving unit 12 has received a protective signal transmitted by another vehicle-mounted radio 1, the determination unit 14 compares the location information of the other vehicle 10 with the location information of the own vehicle 10 and determines whether to perform a protective alert operation based on the comparison result. The protective alert operation is an operation set when a protective signal is received, and is, for example, an operation in which the input / output unit 16 issues an alarm in a predetermined format. For example, the determination unit 14 determines to perform a protective alert operation if, as a result of comparing the location information of the other vehicle 10 with the location information of the own vehicle 10, the distance between the other vehicle 10 and the own vehicle 10 is within a predetermined threshold. If the determination unit 14 determines to perform a protective alert operation, it instructs the input / output unit 16 to perform the protective alert operation. The signal indicating the determination result by the determination unit 14 is output to the input / output unit 16, the transmission unit 13, etc.

[0022] The determination unit 14 compares the location information of the other vehicle 10 with the location information of the own vehicle 10 and determines whether the distance between the other vehicle 10 and the own vehicle 10 is within a predetermined threshold, and further determines whether the level of the radio signal received from the other vehicle 10 is below a predetermined first level. If the determination unit 14 determines that the level of the protective signal received from the other vehicle 10 is below the first level, it outputs an instruction to the transmission unit 13 to transmit a protective signal including the location information of the other vehicle 10. In this case, the transmission unit 13 will transmit a protective signal that includes the location information of the received protective signal, even if the location of the other vehicle 10 is close to the own vehicle 10, but the reception level is low due to the surrounding environment, for example. This makes it possible to perform protective notification operation with only the on-board radio 1 without using a relay device, even when the protective signal is difficult to receive in the surrounding environment.

[0023] Furthermore, the determination unit 14 determines whether the location information of the other vehicle 10 and the location information of the own vehicle 10 can be compared. If they cannot be compared, it determines whether the level of the protective signal received from the other vehicle 10 is at or above a predetermined second level. Cases where the location information cannot be compared include, for example, when the received location information is an invalid value or when the own location information cannot be obtained. If the location information cannot be compared, the determination unit 14 determines that it will perform a protective alert operation if the level of the protective signal received from the other vehicle 10 is at or above the second level. If the determination unit 14 determines that it will perform a protective alert operation, it instructs the input / output unit 16 to perform the protective alert operation.

[0024] Furthermore, the determination unit 14 determines to cancel the protective alert operation if the receiving unit 12 does not receive a protective signal transmitted by another vehicle-mounted radio 1. The determination unit 14 also determines to cancel the protective alert operation if the distance between the other vehicle 10 and the own vehicle 10 is not within a predetermined threshold. The determination unit 14 also determines to stop transmitting a protective signal including the location information of the other vehicle 10 if the level of the protective signal from the other vehicle 10 is not below the first level, and if the location information cannot be compared. The determination unit 14 also determines to cancel the protective alert operation if the level of the protective signal received from the other vehicle 10 is not above the second level, and the location information cannot be compared. Based on the results of each determination, the determination unit 14 outputs signals to the transmitting unit 12, input / output unit 16, etc., instructing them to cancel the protective alert operation or stop transmitting a protective signal including the location information of the other vehicle 10.

[0025] The command and communication unit 15 transmits and receives train radio signals with the base station 5. The command and communication unit 15 transmits train radio signals modulated with the voice signals input by the input / output unit 16, demodulates the received train radio signals, and outputs voice signals from the input / output unit 16.

[0026] The input / output unit 16 includes, for example, operators such as an alarm switch and an alarm sound stop switch, a handset, a speaker, a buzzer, a microphone, and indicator lights such as an alarm LED (light-emitting diode). When the alarm switch is pressed, for example, the input / output unit 16 outputs a predetermined instruction to the transmission unit 13 to emit a protective signal. This operation of pressing the alarm switch is called a protective alarm operation. Furthermore, when the alarm switch is pressed again, for example, the input / output unit 16 outputs a predetermined instruction to the transmission unit 13 to cancel the emission of the protective signal. Furthermore, when the input / output unit 16 receives a signal from the determination unit 14 instructing it to perform a protective alarm reception operation, it lights up the alarm LED and outputs an alarm sound from the speaker, etc. Furthermore, when the input / output unit 16 receives a signal from the determination unit 14 instructing it to cancel the protective alarm reception operation, it turns off the alarm LED and stops the output of the alarm sound from the speaker, etc. Furthermore, when the alarm sound stop switch is pressed, the input / output unit 16 stops the output of the alarm sound. Furthermore, the input / output unit 16 inputs and outputs voice signals to and from the command and communication unit 15 using a handset or the like.

[0027] (Operation of the on-board radio) Referring to Figure 3, an example of the operation of the vehicle-mounted radio 1, which was described with reference to Figures 1 and 2, will now be explained. Figure 3 is a flowchart showing an example of the operation of the vehicle-mounted radio 1 according to an embodiment of the present invention. The process shown in Figure 3 is executed repeatedly at a predetermined cycle.

[0028] When the process shown in Figure 3 begins, the determination unit 14 determines whether the receiving unit 12 has received a protection signal transmitted by another vehicle-mounted radio 1 (S101). If the receiving unit 12 has not received a protection signal (S101: No), the determination unit 14 instructs the input / output unit 16 to cancel the protection alert operation and instructs the transmitting unit 13 to stop transmitting the protection signal (S112), and terminates the process shown in Figure 3. Note that if the instruction to cancel the protection alert operation is given in step S112, the input / output unit 16 will stop the protection alert operation if it is currently performing the protection alert operation, and will do nothing if it is not performing the protection alert operation. Also, if the instruction to stop transmitting the protection signal is given in step S112, the transmitting unit 13 will stop transmitting the protection signal if it is currently transmitting the protection signal, and will do nothing if it is not transmitting the protection signal. The responses of the input / output unit 16 and the transmitting unit 13 to the instructions to cancel or stop are the same and will not be explained further.

[0029] If the receiving unit 12 has received a protective signal (S101: Yes), the determination unit 14 determines whether or not the location information can be compared (S102). In step 102, the determination unit 14 determines whether or not the received protective signal contains location information data and whether or not it can be compared with its own location information. If the received location information is invalid or its own location information cannot be obtained and the location information cannot be compared (S102: No), the determination unit 14 determines whether or not the reception level of the protective signal is high (S104). In step S104, the determination unit 14 determines whether or not the level of the received protective signal is level 2 or higher.

[0030] If the reception level is low (the level of the received protective signal is below the second level) (S104: No), the determination unit 14 cancels the protective alert receiving operation or protective signal transmission operation if it was performing one (S108), and checks for the reception of the protective signal again (S101). If the reception level is high (the level of the received protective signal is at or above the second level) (S104: Yes), the determination unit 14 cancels the protective signal transmission operation if it was performing one, but performs a protective alert receiving operation (S107), and checks for the reception of the protective signal again (S101).

[0031] If the location information can be compared (S102: Yes), the determination unit 14 determines whether the location information in the received protection signal is close to its own location information (S103). In step S103, the determination unit 14 compares the location information of the other vehicle 10 with the location information of its own vehicle 10 and determines that they are close if the distance between the other vehicle 10 and its own vehicle 10 is within a predetermined threshold. The threshold used as the criterion for determining whether they are close can be set later, for example, with a default value of within 1 km. If the location information is far (the distance is greater than the predetermined threshold) (S103: No), the determination unit 14 cancels any protection notification reception operations or protection signal transmission operations that were being performed (S106) and checks for the reception of the protection signal again (S101).

[0032] If the location information is close (the distance is within a predetermined threshold) (S103: Yes), the determination unit 14 performs a protective alert reception operation (S105) and further determines the reception level of the protective signal (S109). In step S109, the determination unit 14 determines whether the level of the received protective signal is below a predetermined first level. If the reception level is low (the level is below the first level) (S109: Yes), the determination unit 14 causes the transmission unit 13 to transmit a protective signal with the same location information data as the received protective signal (S110) and confirms the reception of the protective signal again (S101). In step S110, the location information carried in the protective signal is the received location information, not its own location information, so another on-board radio 1 can compare its location information with the on-board radio 1 that was originally issuing a protective alert. If the reception level is not low (if the level is greater than the first level) (S109: No), the determination unit 14 stops the protective signal transmission operation if it was performing it (S111), and checks for the reception of the protective signal again (S101).

[0033] Here, with reference to Figure 4, an example in which the onboard radio 1 relays a protective signal will be described. Figure 4 is a schematic diagram illustrating an example of operation of a train radio system 200 according to an embodiment of the present invention. In the example shown in Figure 4, two onboard radios 1-a to 1-h are installed on each of the trains 100-1 and 100-2, which run on the up or down track of one line, and on the trains 100-3 and 100-4, which run on the up or down track of another line. Figure 4 shows an example in which the onboard radio 1-a first makes a protective alarm, and the onboard radio 1-e takes over and relays the location information.

[0034] In the example shown in Figure 4, the protective signal SG1 transmitted by the on-board radio 1-a is received by the on-board radios 1-b, 1-c, 1-d, and 1-e. The reception level of protective signal SG1 at on-board radios 1-b, 1-c, and 1-d is higher than the first level (high reception level), while the reception level of protective signal SG1 at on-board radio 1-e is lower than the first level (low reception level). Furthermore, the position information contained in protective signal SG1 and the position information acquired by on-board radio 1-e are comparable, and the distance between on-board radio 1-a and on-board radio 1-e is below a predetermined threshold. In this case, on-board radio 1-e performs a protective notification operation and transmits protective signal SG2. Protective signal SG2 contains the position information contained in protective signal SG1. In the example shown in Figure 4, the protective signal SG2 is received by the on-board radio equipment 1-f to 1-h.

[0035] As described above, according to this embodiment, the vehicle-mounted radio 1 transmits a protective signal with location information attached. Another vehicle-mounted radio 1 that receives the protective signal compares its own location information with the received location information to determine whether to perform a protective alert. Furthermore, if it is determined that the reception level of the protective signal is low, the protective signal is transmitted and relayed to surrounding vehicle-mounted radio 1.

[0036] (Effects / Actions) According to this embodiment, since the decision to perform a protective alert operation is made based on location information, the alert range when the protective alert operation is actually performed can be kept within an appropriate range. Furthermore, by setting the conditions for relaying protective signals between vehicle-mounted radio units 1 to a distance within a predetermined threshold and a reception level below a predetermined first level, the number of vehicle-mounted radio units 1 that transmit protective signals for relaying can be limited compared to when these conditions are not set. In addition, continuous relaying can be prevented, so the alert range of the protective signal due to relaying can be kept within an appropriate range.

[0037] Furthermore, according to this embodiment, by relaying the protective signal between the on-board radio units 1, the need for dedicated equipment for protective relay can be reduced, thereby lowering costs. Also, for example, in locations with a clear line of sight, when a protective alarm is issued, the reception level of the protective signal may become higher than expected, potentially causing the protective alarm to be triggered beyond the expected range. However, by using location information for judgment, false positives of protective alarms can be reduced.

[0038] (Other embodiments) In the above embodiment, the driving area can be divided into multiple sections and the criteria for determining location information can be different for each driving area. This configuration allows for operation that is easier to manage by reflecting the reach of local protection signals.

[0039] (Minimum configuration of this embodiment) Figure 5 is a block diagram showing the minimum configuration of a wireless device according to an embodiment of the present invention. Figure 6 is a flowchart showing the minimum configuration of a control method for a wireless device according to an embodiment of the present invention.

[0040] As shown in Figure 5, the wireless device 1000 according to this embodiment is mounted on a vehicle 10 and only needs to include at least a receiving means 1001, a location information acquisition means 1002, and a determination means 1003. The receiving means 1001 receives a predetermined wireless signal that includes location information of another vehicle 10 transmitted from another vehicle 10. The location information acquisition means 1002 acquires the location information of the own vehicle 10. The determination means 1003 compares the location information of the other vehicle 10 with the location information of the own vehicle 10 and, based on the comparison result, determines whether or not to perform a predetermined operation set when a predetermined wireless signal is received.

[0041] Furthermore, as shown in Figure 6, the control method according to this embodiment is a control method for a wireless device mounted on a vehicle, and includes steps S1 to S3. In step S1, a predetermined wireless signal including location information of another vehicle transmitted from another vehicle is received. In step S2, the location information of the own vehicle is acquired. In step S3, the location information of the other vehicle and the location information of the own vehicle are compared, and based on the comparison result, it is determined whether or not to perform a predetermined operation set when a predetermined wireless signal is received.

[0042] (Computer configuration) Figure 7 is a schematic block diagram showing the configuration of a computer according to at least one embodiment. The computer 700 comprises a CPU (Central Processing Unit) 710, main memory 720, auxiliary memory 730, and interface 740. For example, a non-volatile storage medium 750 is connected to the interface 740. At least a part of the above-mentioned wireless device 1000 may be implemented in the computer 700. The operation of each of the above-mentioned processing units may be stored in the auxiliary memory 730 in the form of a program. The CPU 710 reads the program from the auxiliary memory 730, expands it in the main memory 720, and executes the above processing according to the program. The CPU 710 also reserves storage areas in the main memory 720 corresponding to each of the above-mentioned storage units according to the program.

[0043] The program may be for implementing some of the functions that the computer 700 is to perform. For example, the program may perform functions in combination with other programs already stored in the auxiliary storage device 730, or in combination with other programs implemented in other devices. In other embodiments, the computer may be equipped with a custom LSI (Large Scale Integrated Circuit) such as a PLD (Programmable Logic Device) in addition to, or instead of, the above configuration. Examples of PLDs include PAL (Programmable Array Logic), GAL (Generic Array Logic), CPLD (Complex Programmable Logic Device), FPGA (Field Programmable Gate Array), etc. In this case, some or all of the functions implemented by the CPU 710 may be implemented by the integrated circuit.

[0044] Examples of auxiliary storage devices 730 include HDDs (Hard Disk Drives), SSDs (Solid State Drives), magnetic disks, magneto-optical disks, CD-ROMs (Compact Disc Read Only Memory), DVD-ROMs (Digital Versatile Disc Read Only Memory), and semiconductor memory. The auxiliary storage device 730 may be an internal medium directly connected to the bus of the computer 700, or an external medium connected to the computer 700 via an interface 740 or a communication line. Furthermore, if this program is distributed to the computer 700 via a communication line, the computer 700 that receives the distribution may expand the program into the main memory 720 and execute the above processing. In at least one embodiment, the auxiliary storage device 730 is a tangible storage medium that is not temporary.

[0045] While embodiments of this invention have been described above with reference to the drawings, the specific configuration is not limited to the embodiments described above, and design modifications and the like are also included within the scope of the gist of this invention. Furthermore, some or all of the program executed by the computer in the above embodiments can be distributed via a computer-readable recording medium or communication line.

[0046] Some or all of the above embodiments may be described as follows, but are not limited to the following:

[0047] (Note 1) A wireless device mounted on a vehicle, comprising: receiving means for receiving a predetermined wireless signal transmitted from another vehicle, which includes location information of the other vehicle; location information acquisition means for acquiring location information of the own vehicle; and determination means for comparing the location information of the other vehicle with the location information of the own vehicle, and determining whether or not to perform a predetermined operation set when the predetermined wireless signal is received, based on the comparison result.

[0048] (Note 2) The wireless device as described in (Note 1), wherein the determination means determines to perform the predetermined operation when the distance between the other vehicle and the own vehicle is within a predetermined threshold, based on the result of comparing the location information of the other vehicle with the location information of the own vehicle.

[0049] (Note 3) The threshold is set for each of the multiple driving areas of the vehicle. (Note 2) Wireless device.

[0050] (Note 4) The wireless device according to (Note 2) or (Note 3), wherein the determination means compares the location information of the other vehicle with the location information of the own vehicle and determines that the distance between the other vehicle and the own vehicle is within a predetermined threshold, and further determines whether the level of the wireless signal received from the other vehicle is below a predetermined first level, and if the determination means determines that the level of the wireless signal received from the other vehicle is below the first level, the device further comprises a transmission means for transmitting the predetermined wireless signal including the location information of the other vehicle.

[0051] (Note 5) The wireless device according to any of (Notes 1) to (Note 4), wherein the determination means further determines whether the location information of the other vehicle and the location information of the own vehicle can be compared, and if they cannot be compared, determines whether the level of the wireless signal received from the other vehicle is at or above a predetermined second level, and if it is at or above the second level, determines to perform the predetermined operation.

[0052] (Note 6) The predetermined radio signal is a signal intended for train protection, and the predetermined operation is an operation to issue an alarm. A radio device as described in any of (Note 1) to (Note 5). [Explanation of Symbols]

[0053] 1, 1-a to 1-h... On-board radio, 10... Vehicle, 11... Location information acquisition unit, 12... Receiving unit, 13... Transmitting unit, 14... Determination unit, 15... Command and communication unit, 16... Input / Output unit, 100, 100-1 to 100-4... Train, 1000... Radio device, 1001... Receiving means, 1002... Location information acquisition means, 1003... Determination means

Claims

1. It is mounted on the vehicle, Receiving means for receiving a predetermined wireless signal including location information of the other vehicle transmitted from another vehicle, A means for acquiring location information to acquire the location information of the vehicle, A determination means that compares the location information of the other vehicle with the location information of the own vehicle and determines, based on the comparison result, whether or not to perform a predetermined action set when the predetermined wireless signal is received. Equipped with, The determination means compares the location information of the other vehicle with the location information of the own vehicle and determines whether the distance between the other vehicle and the own vehicle is within a predetermined threshold, and further determines whether the level of the wireless signal received from the other vehicle is below a predetermined first level. The system further includes a transmission means for transmitting a predetermined radio signal, including location information of the other vehicle, when the determination means determines that the level of the radio signal received from the other vehicle is below a first level. Radio equipment.

2. The determination means compares the location information of the other vehicle with the location information of the own vehicle and determines that if the distance between the other vehicle and the own vehicle is within a predetermined threshold, it will perform the predetermined action. The wireless device according to claim 1.

3. The threshold is set for each of the multiple driving areas of the vehicle. The wireless device according to claim 2.

4. The determination means further determines whether the location information of the other vehicle and the location information of the own vehicle can be compared, and if they cannot be compared, determines whether the level of the wireless signal received from the other vehicle is at or above a predetermined second level, and if it is at or above the second level, determines to execute the predetermined operation. The wireless device according to claim 1.

5. The aforementioned predetermined radio signal is a signal intended for train protection. The aforementioned predetermined action is the action of issuing an alarm. A wireless device according to any one of claims 1 to 4.

6. A method for controlling a wireless device mounted on a vehicle, A receiving step of receiving a predetermined radio signal that includes location information of the other vehicle transmitted from another vehicle, The acquisition step involves obtaining the location information of the vehicle, A determination step involves comparing the location information of the other vehicle with the location information of the own vehicle, and determining whether or not to perform a predetermined action set when the predetermined wireless signal is received, based on the comparison result. Includes In the determination step, If, as a result of comparing the location information of the other vehicle with the location information of the own vehicle, the distance between the other vehicle and the own vehicle is within a predetermined threshold, then it is determined whether or not the level of the radio signal received from the other vehicle is below a predetermined first level. If the determination step determines that the level of the radio signal received from the other vehicle is below the first level, the transmission step further includes transmitting the predetermined radio signal including the location information of the other vehicle. Control method.

7. The computer of the wireless device installed in the vehicle, Receiving means for receiving a predetermined radio signal that includes location information of the other vehicle transmitted from another vehicle, Location information acquisition means for acquiring the location information of the vehicle, A determination means that compares the location information of the other vehicle with the location information of the own vehicle and determines, based on the comparison result, whether or not to perform a predetermined action set when the predetermined wireless signal is received. To make it function as, The determination means compares the location information of the other vehicle with the location information of the own vehicle and determines whether the distance between the other vehicle and the own vehicle is within a predetermined threshold, and further determines whether the level of the wireless signal received from the other vehicle is below a predetermined first level. A program that, when the determination means determines that the level of the radio signal received from the other vehicle is below the first level, further functions as a transmitting means for transmitting the predetermined radio signal including the location information of the other vehicle.

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