JP7382469B2 - Wireless base stations, mobile stations, vehicles, and message transmission methods - Google Patents

Description

The present invention relates to a wireless base station, a mobile station, a vehicle, and a message transmission method.

Conventionally, in an intelligent transportation system (for example, ITS), a technology has been proposed to perform wireless communication between a roadside device, which is a base station installed around the road, and an on-vehicle device, which is a mobile station installed in a vehicle. (For example, see Non-Patent Document 1).

Radio Industries Association, “700MHz Band Intelligent Transport System ARIB-STD T109 1.3 Version”, [online], July 27, 2017, [searched on June 22, 2018], Internet http: //www. arib. or. jp/tyosakenkyu/kikaku_tushin/tsushin_kikaku_number. html

Conventional ITS aims to reduce traffic accidents by targeting vehicles such as automobiles traveling on roads, but does not sufficiently consider railway vehicles traveling on railways.

For this reason, conventional ITS is capable of preventing level crossing accidents at level crossings where railways and roads intersect, especially when vehicles become stagnant on the level crossing as a result of misdiagnosing traffic jams ahead of the level crossing (so-called jams). There is room for improvement in reducing level crossing accidents.

Therefore, an object of the present invention is to provide a base station, a mobile station, a vehicle, and a message transmission method that can reduce railroad crossing accidents.

The base station according to the first aspect is provided around a railroad crossing where a railway and a road intersect. The base station includes a transmitter that transmits a message via wireless communication to vehicles passing on the road toward the entrance of the level crossing. The transmitter transmits the message including at least one information element indicating a traffic condition of the road on the exit side of the level crossing to the vehicle.

The mobile station according to the second aspect is provided in a vehicle. The mobile station receives a message via wireless communication from a base station provided around the level crossing when the vehicle passes through the road toward the entrance side of the level crossing where a railway and a road intersect. Department. The receiving unit receives from the base station the message including at least one information element indicating a traffic situation on the road on the exit side of the level crossing.

A vehicle according to the third aspect includes the mobile station according to the second aspect.

A message transmitting method according to a fourth aspect is a message transmitting method in which a base station installed around a level crossing where a railway and a road intersect transmits a message to vehicles by wireless communication, the message transmitting method being on the entrance side of the level crossing. The method further includes the step of transmitting a message including an information element indicating the traffic condition of the road on the exit side of the level crossing to vehicles passing on the road toward the exit of the level crossing.

According to one aspect of the present invention, it is possible to provide a base station, a mobile station, a vehicle, and a message transmission method that can reduce railroad crossing accidents.

FIG. 1 is a diagram showing the configuration of a traffic communication system according to an embodiment. FIG. 2 is a diagram showing the configuration of a roadside machine according to an embodiment. FIGS. 3A to 3C are diagrams showing the structure of a message for a vehicle according to an embodiment. FIG. 4 is a diagram showing the configuration of a vehicle according to one embodiment. FIG. 5 is a diagram illustrating an example of an operation sequence of the traffic communication system according to one embodiment.

Embodiments will be described with reference to the drawings. In addition, in the description of the following drawings, the same or similar parts are given the same or similar symbols.

(Traffic communication system)
First, a transportation communication system according to an embodiment will be described. FIG. 1 is a diagram showing the configuration of a traffic communication system according to an embodiment.

As shown in FIG. 1, the traffic communication system according to one embodiment includes vehicles 10a to 10d and roadside machines 20a and 20b. In the following, when the vehicles 10a to 10d are not distinguished, they are simply referred to as the vehicle 10, and when the roadside machines 20a and 20b are not distinguished, they are simply referred to as the roadside machine 20. The roadside device 20 is an example of a base station.

Vehicle 10 travels on road 110. In FIG. 1, a four-wheeled motor vehicle is illustrated as the vehicle 10, but the vehicle 10 may also be a motorcycle, a tricycle, or an electric bicycle. Furthermore, although a one-lane road 110 is illustrated, the road 110 may have a plurality of lanes.

The roadside machine 20a is provided around a level crossing 150 where the road 110 and the railway 120 intersect. On the railway 120, railway vehicles (not shown) pass. In FIG. 1, the railway 120 consisting of one track is illustrated, but the railway 120 may have a plurality of tracks.

The level crossing 150 is provided with level crossing safety equipment. FIG. 1 shows an example in which a level crossing warning device 130 (130a and 130b) and a level crossing barrier 140 (140a and 140b) are provided as level crossing road safety equipment. The level crossing warning device 130 is a device that notifies vehicle drivers passing on the road 110 of the existence of the level crossing 150, and when a railway vehicle approaches, warns with sound and light and stops road traffic. . The level crossing barrier 140 is a device for restricting traffic on the road 110 in order to give priority to the passage of railway vehicles. The level crossing barrier 140 has a barrier and a mechanism for raising and lowering the barrier.

A sensor 160 is provided around the level crossing 150. The sensor 160 detects the traffic situation on the road 110 on the exit side of the level crossing 150, and outputs the detection result to the roadside device 20a. The sensor 160 may be any sensor that can detect traffic conditions, such as an ultrasonic sensor, an optical sensor, or an image sensor. Note that the exit side of the level crossing 150 refers to the rear side of the level crossing 150 in the vehicle traffic direction of the lane, and the entrance side of the level crossing 150 refers to the front side of the level crossing 150 in the vehicle traffic direction of the lane.

A traffic signal 170 is provided on the road 110 on the exit side of the level crossing 150 at a distance from the level crossing 150. The traffic signal 170 is a device that displays signals such as permission to proceed and instructions to stop in order to ensure traffic safety on the road 110 or smooth the flow of traffic. In FIG. 1, an example is shown in which the traffic signal 170 displays a light-colored signal indicating a stop instruction, and the vehicles 10b to 10d are thereby stopped.

The roadside device 20b is provided around the traffic signal 170. The roadside device 20b acquires signal light color information indicating the signal light color of the traffic signal 170. The signal light color information may include not only information indicating the current signal light color but also information indicating a transition pattern of the signal light color in a certain period of time in the future. The roadside device 20b transmits the signal light color information to the roadside device 20a via wireless communication.

The roadside device 20a transmits a message via wireless communication to the vehicle 10a passing on the road 110 toward the entrance side of the level crossing 150. Specifically, the roadside device 20a transmits a message including at least one information element indicating the traffic situation of the road 110 on the exit side of the level crossing 150 to the vehicle 10a. For example, at least one information element indicating the traffic situation of the road 110 on the exit side of the level crossing 150 includes signal light color information that the roadside device 20a receives from the roadside device 20b and detection information that the roadside device 20a acquires from the sensor 160. based on.

Vehicle 10a receives a message from roadside device 20a. The vehicle 10a presents the traffic situation of the road 110 on the exit side of the level crossing 150 to the driver of the vehicle 10a based on the message received from the roadside device 20a. When the vehicle 10a is a self-driving vehicle, the vehicle 10a takes into account the traffic situation of the road 110 on the exit side of the level crossing 150 based on the message received from the roadside device 20a, and adjusts the direction of the vehicle 10a to the level crossing 150. Advancement and stopping may be automatically controlled.

In this way, a message including at least one information element indicating the traffic situation of the road 110 on the exit side of the level crossing 150 is transmitted to the vehicle 10a passing on the road 110 toward the entrance side of the level crossing 150. Therefore, level crossing accidents on the level crossing road 150 can be reduced. In particular, it is possible to reduce level crossing accidents that occur when the vehicle 10a becomes stagnant on the level crossing road 150 as a result of the driver of the vehicle 10a misjudging the traffic jam ahead of the level crossing (so-called jammed ahead).

(roadside unit)
Next, the roadside machine 20a according to one embodiment will be described. FIG. 2 is a diagram showing the configuration of the roadside machine 20a according to one embodiment.

As shown in FIG. 2, the roadside device 20a includes an antenna 21a, a wireless communication section 21, a control section 22, and an interface 23. Interface 23 is an interface for communicating with sensor 160. The roadside device 20a may further include an interface for communicating with the level crossing warning device 130 and the level crossing barrier 140. The roadside machine 20a may further include an interface for communicating with a sensor for detecting the approach of a railway vehicle. Furthermore, the roadside device 20a may include a GNSS (Global Navigation Satellite System) receiver.

The wireless communication unit 21 performs wireless communication via the antenna 21a. The antenna 21a may be an omnidirectional antenna, or may be a directional antenna that has directivity toward the entrance side of the level crossing 150. The antenna 21a may be an adaptive array antenna whose directivity can be dynamically changed.

The wireless communication method of the wireless communication unit 21 may be a method based on ARIB T109, a method based on the V2X (Vehicle to Everything) standard of 3GPP (registered trademark; the same applies hereinafter), A method based on wireless LAN standards such as the IEEE802.11 series may be used. The wireless communication unit 21 may be configured to be compatible with all of these communication standards.

The wireless communication unit 21 includes a receiving unit 21b that converts a wireless signal received by the antenna 21a into a baseband signal (received packet) and outputs the baseband signal (received packet) to the control unit 22. The wireless communication unit 21 also includes a transmitting unit 21c that converts the baseband signal (transmission packet) output by the control unit 22 into a wireless signal and transmits it from the antenna 21a.

When the wireless communication unit 21 complies with the ARIB T109 standard, the wireless communication unit 21 may have a function of performing carrier sense using the receiving unit 21b to determine the availability of a radio wave frequency (for example, 700 MHz band). . The transmitting unit 21c of the wireless communication unit 21 may transmit the packet at a timing determined according to the result of carrier sense. One message may be composed of one or more packets.

For example, the wireless communication unit 21 performs road-to-road communication with another roadside machine 20b. Road-to-road communication may be performed by unicast, broadcast, or multicast. The receiving unit 21b of the wireless communication unit 21 receives the road-to-road communication packet from the roadside device 20b. The road-to-road communication packet may include identification information used to identify the transmission source. The receiving unit 21b receives a message composed of one or more packets from the roadside device 20b. The message includes the traffic light color information described above.

The wireless communication unit 21 performs road-to-vehicle communication with the vehicle 10. Road-to-vehicle communication may be performed by unicast, broadcast, or multicast. The road-to-vehicle communication packet transmitted to the vehicle 10 includes identification information used to identify the transmission source, synchronization information indicating the synchronization method for the roadside device 20a, packet transmission time, and period information indicating the period of the road-to-vehicle communication (for example, It may also include the number of transfers of vehicle-to-vehicle communication, the period length of road-to-vehicle communication, etc.

The transmitting unit 21c of the wireless communication unit 21 transmits a message composed of one or more packets to the vehicle 10 through road-to-vehicle communication. This message is generated by the control unit 22.

The control unit 22 is configured by a control circuit having at least one memory and at least one processor electrically connected to the memory. The control unit 22 controls various functions in the roadside machine 20a. The control unit 22 periodically generates a message for the vehicle 10, and periodically transmits the message via the transmitting unit 21c.

FIG. 3 is a diagram showing the structure of a message M for the vehicle 10 according to one embodiment. The message M may be a message sent and received in layer 2 or layer 3 in the OSI reference model, or a message sent and received in an application layer.

As shown in FIG. 3(A), message M has information elements E1 to E5.

The information element E1 is level crossing existence information indicating that the level crossing 150 exists on the road 110. The information element E1 may be a flag that is set to "1" when the level crossing 150 exists, and set to "0" when the level crossing 150 does not exist.

The information element E2 is level crossing geographical information indicating the geographical attributes of the level crossing 150. Information element E2 includes information indicating the geographic location (latitude and longitude) of the level crossing 150. The information element E2 may include information indicating the scale of the level crossing 150, for example, the distance between the entrance and exit. The information indicating the distance between the entrance and exit of the level crossing 150 may be a numerical value indicating this distance (for example, how many meters), or information indicating whether the railway 120 is a single track or a double track. It may be.

Information element E3 is railroad vehicle approach information indicating whether or not the approach of a railroad vehicle to the level crossing 150 is detected. The information element E3 may be a flag that is set to "1" when the approach of a railway vehicle is detected, and is set to "0" when the approach of a railway vehicle is not detected. The information element E3 may indicate whether the level crossing alarm 130 is performing a warning operation or may indicate whether the level crossing barrier 140 is performing a blocking operation.

The information element E4 is at least one information element (level crossing destination traffic information) indicating the traffic situation of the road 110 on the exit side of the level crossing 150. FIG. 3(B) shows a first configuration example of the information element E4. FIG. 3C shows a second configuration example of the information element E4.

As shown in FIG. 3B, the information element E4 includes an information element E41 (preceding vehicle position information) indicating the latitude and longitude of the preceding vehicle 10b on the road 110 on the exit side of the level crossing 150, and the preceding vehicle 10b. information element E42 (preceding vehicle speed information) indicating the moving speed of the vehicle. The preceding vehicle 10b refers to the vehicle 10 closest to the level crossing 150 on the exit side of the level crossing 150, that is, the vehicle 10 that has recently passed through the level crossing 150.

The information element E41 may be information indicating whether or not the preceding vehicle 10b exists on the exit side of the level crossing 150. The information element E42 may be a numerical value indicating the moving speed of the preceding vehicle 10b (for example, how many kilometers per hour), or may be a flag indicating whether the preceding vehicle 10b is in a stopped state. The stopped state refers to a state in which the moving speed is less than a threshold value, for example, a state in which the moving speed is zero.

As shown in FIG. 3C, the information element E4 includes an information element E44 (preceding vehicle stop information) indicating whether there is a stopped preceding vehicle 10b on the road 110 on the exit side of the level crossing 150. The information element E44 may be a flag that is set to "1" when there is a stopped preceding vehicle 10b on the road 110 on the exit side of the level crossing 150, and set to "0" when there is no preceding vehicle 10b.

The control unit 22 may generate information elements E41, E42, and E44 based on the detection results obtained by the sensor 160. Alternatively, the control unit 22 may generate the information elements E41, E42, and E44 based on a message that the receiving unit 21b receives from the preceding vehicle 10b through road-to-vehicle communication. This message includes position information indicating the geographical position of the preceding vehicle 10b and speed information indicating the moving speed of the preceding vehicle 10b.

When a traffic signal 170 is provided on the road 110 on the exit side of the level crossing 150 at a distance from the level crossing 150, the information element E4 is the information element E43 (level crossing destination signal information) indicating the color of the signal light of the traffic signal 170. including. The information element E43 may include not only information indicating the current traffic light color but also information indicating a transition pattern of the traffic light color in a certain period of time in the future.

The control unit 22 may generate the information element E43 based on the signal light color information that the receiving unit 21b receives from another roadside device 20b through road-to-road communication. Alternatively, the control unit 22 may generate the information element E43 based on signal light color information obtained from a traffic management center (not shown) via a communication line.

If the road 110 has a plurality of lanes in which traffic occurs in a round-trip direction, the message M may include an information element E5 (target lane information) for specifying the lane targeted by the information element E4. The information element E5 may be the identifier of the lane targeted by the information element E4, or may be information indicating the vehicle traffic direction (direction) of the lane targeted by the information element E4.

(vehicle)
Next, a vehicle 10a according to an embodiment will be described. FIG. 4 is a diagram showing the configuration of a vehicle 10a according to an embodiment.

As shown in FIG. 4, the vehicle 10a includes a GNSS receiver 12, a presentation section 13, a drive control section 14, and an on-vehicle device 16. The on-vehicle device 16 is an example of a mobile station provided in the vehicle 10a. The on-vehicle device 16 includes an antenna 11a, a wireless communication section 11, and a control section 15.

The wireless communication unit 11 performs wireless communication via the antenna 11a. The antenna 11a may be an omnidirectional antenna or a directional antenna having directivity.

The wireless communication method of the wireless communication unit 11 may be a method based on ARIB T109, a method based on 3GPP V2X standard, or a method based on wireless LAN standards such as the IEEE802.11 series. It may be a method. The wireless communication unit 11 may be configured to be compatible with all of these communication standards.

The wireless communication unit 11 includes a receiving unit 11b that converts a wireless signal received by the antenna 11a into a baseband signal (received packet) and outputs the baseband signal (received packet) to the control unit 15. The wireless communication unit 11 also includes a transmitting unit 11c that converts the baseband signal (transmission packet) output by the control unit 15 into a wireless signal and transmits it from the antenna 11a.

When the wireless communication unit 11 complies with the ARIB T109 standard, the wireless communication unit 11 may have a function of performing carrier sense using the receiving unit 11b to determine the availability of a radio wave frequency (for example, 700 MHz band). . The transmitting unit 11c of the wireless communication unit 11 may transmit the packet at a timing determined according to the result of carrier sense. One message may be composed of one or more packets.

The wireless communication unit 11 performs road-to-vehicle communication with the roadside device 20a. Road-to-vehicle communication may be performed by unicast or broadcast. The receiving unit 11b of the wireless communication unit 11 receives the message M from the roadside device 20a.

The GNSS receiver 12 performs positioning based on GNSS satellite signals and outputs position information indicating the current geographical position (latitude and longitude) of the vehicle 10a to the control unit 15.

The presentation unit 13 presents information to the driver of the vehicle 10a under the control of the control unit 15. For example, the presentation unit 13 includes at least one of a display that displays information and a speaker that outputs information as audio. In the following, presentation of information refers to at least one of the display of information and the audio output of information.

The drive control unit 14 controls an engine or a motor as a power source, a power transmission mechanism, a brake, and the like. When the vehicle 10a is an automatic driving vehicle, the drive control unit 14 may cooperate with the control unit 15 to control the drive of the vehicle 10a.

The control unit 15 is configured by a control circuit having at least one memory and at least one processor electrically connected to the memory. The control unit 15 controls various functions in the vehicle 10a (vehicle device 16).

For example, the control unit 15 controls the presentation unit 13 based on the message M that the reception unit 11b receives from the roadside device 20a.

The control unit 15 may control the presentation unit 13 to present information that there is a level crossing 150 in the direction of travel of the vehicle 10a based on the information element E1 (level crossing existence information) included in the message M. good.

The control unit 15 may control the presentation unit 13 to present information indicating the geographic attributes of the level crossing 150 based on the information element E2 (level crossing geographical information) included in the message M. Here, the control unit 15 may control the presentation unit 13 to present information indicating the distance between the current position of the vehicle 10a and the position of the level crossing 150.

The control unit 15 causes the presentation unit 13 to present information indicating whether or not the approach of a railway vehicle to the level crossing 150 is detected based on the information element E3 (rail vehicle approach information) included in the message M. may be controlled.

The control unit 15 controls the presentation unit 13 to present information indicating the traffic situation of the road 110 on the exit side of the level crossing 150 based on the information element E4 (traffic information at the level crossing) included in the message M. Good too.

For example, the control unit 15 controls the road 110 on the exit side of the level crossing 150 based on the information element E41 (leading vehicle position information), the information element E42 (leading vehicle speed information), or the information element E44 (leading vehicle stop information) If it is determined that there is a preceding vehicle 10b in a stopped state, the presentation unit 13 is controlled to present information to that effect. Here, the control unit 15 may alert the driver by presenting information such as "Beware of entering the railroad crossing" or "Congestion ahead of the railroad crossing. Be careful of entering."

When the control unit 15 determines that the traffic signal 170 on the exit side of the level crossing 150 is displaying a signal indicating a stop instruction based on the information element E43 (level crossing destination signal information), the control unit 15 presents information to that effect. The presentation unit 13 is controlled so as to. Here, the control unit 15 may alert the driver by presenting information such as "Red light at railroad crossing. Be careful of trespassing."

When the road 110 has multiple lanes for traffic in the round-trip direction, the control unit 15 displays information based on the information element E4 based on the information element E5 (target lane information) included in the message M. It may be determined whether or not to do so. Specifically, the control unit 15 presents information based on the information element E4 only when the lane in which the vehicle 10a is traveling matches the lane indicated by the information element E5.

When the vehicle 10a is a self-driving vehicle, the control unit 15 may control the drive of the vehicle 10a based on the message M received by the receiving unit 11b from the roadside device 20a.

The control unit 15 decelerates the vehicle 10a when the vehicle 10a approaches the level crossing 150 based on the information element E1 (level crossing existence information) and the information element E2 (level crossing geographical information) included in the message M, and The vehicle may be controlled to temporarily stop before the road 150.

Further, if the control unit 15 determines that the approach of a railway vehicle to the level crossing 150 is detected based on the information element E3 (rail vehicle approach information) included in the message M, the control unit 15 determines that the railway vehicle approaches the level crossing 150. The vehicle 10a may be controlled to remain stopped until the vehicle 10a passes through.

The control unit 15 controls the entry of the vehicle 10a into the level crossing 150 based on the information element E4 (traffic information at the level crossing) included in the message M, taking into consideration the traffic situation of the road 110 on the exit side of the level crossing 150. May be controlled.

For example, the control unit 15 controls the road 110 on the exit side of the level crossing 150 based on the information element E41 (leading vehicle position information), the information element E42 (leading vehicle speed information), or the information element E44 (leading vehicle stop information) If it is determined that there is a preceding vehicle 10b in a stopped state at Good too.

If the control unit 15 determines that the traffic signal 170 on the exit side of the level crossing 150 is displaying a signal indicating a stop instruction based on the information element E43 (level crossing destination signal information), the traffic signal 170 indicates permission to proceed. The vehicle 10a may be controlled to continue to be stopped until the signal changes to the signal indicating .

When the road 110 has multiple lanes for traffic in the round-trip direction, the control unit 15 displays information based on the information element E4 based on the information element E5 (target lane information) included in the message M. It may be determined whether or not to do so. Specifically, the control unit 15 controls the drive of the vehicle 10a based on the information element E4 only when the lane in which the vehicle 10a is traveling matches the lane indicated by the information element E5.

(Operation sequence example)
FIG. 5 is a diagram illustrating an example of an operation sequence of the traffic communication system according to one embodiment. The sequence shown in FIG. 5 may be performed periodically.

As shown in FIG. 5, in step S1, the receiving unit 21b of the roadside device 20a receives signal light color information from the roadside device 20b through roadside communication.

In step S2, the control unit 22 of the roadside machine 20a acquires detection information from the sensor 160 via the interface 23. Note that the order of step S1 and step S2 may be reversed.

In step S3, the control unit 22 of the roadside machine 20a generates a message M.

In step S4, the transmitter 21c of the roadside device 20a transmits the generated message M to the vehicle 10a through road-to-vehicle communication. The receiving unit 11b of the vehicle 10a receives the message M from the roadside device 20a.

In step S5, the control unit 15 of the vehicle 10a presents information based on the received message M or controls the drive of the vehicle 10a.

(Other embodiments)
In the embodiment described above, the information element E4 (level crossing destination traffic information) indicating the traffic situation on the road 110 on the exit side of the level crossing 150 includes an information element regarding the preceding vehicle 10b and an information element regarding the traffic signal 170, separately. An example has been explained.

Here, the information element regarding the preceding vehicle 10b indicates the current stopped state of the preceding vehicle 10b on the exit side of the level crossing 150, and the information element regarding the traffic signal 170 indicates the near future traffic congestion situation on the exit side of the level crossing 150. It can be considered that it indicates the following.

However, the roadside device 20a determines whether or not to permit the vehicle 10a to enter the level crossing 150, taking into consideration the situations of both the preceding vehicle 10b and the traffic signal 170, and determines whether the vehicle 10a is allowed to enter the level crossing 150. One information element indicating whether or not entry is permitted may be transmitted to the vehicle 10a as the information element E4 (traffic information at the level crossing destination).

For example, if the roadside device 20a determines that the preceding vehicle 10b is stopped on the exit side of the level crossing 150 or that the exit side of the level crossing 150 will be congested in the near future, the roadside device 20a uses the information element E4 indicating that entry to the level crossing 150 is prohibited. (traffic information at the railroad crossing) is transmitted to the vehicle 10a.

A program that causes a computer to execute each process performed by the vehicle 10 (on-vehicle device 16) and a program that causes the computer to execute each process that the roadside device 20 performs may be provided. The program may be recorded on a computer readable medium. Computer-readable media allow programs to be installed on a computer. Here, the computer-readable medium on which the program is recorded may be a non-transitory recording medium. The non-transitory recording medium is not particularly limited, and may be, for example, a recording medium such as a CD-ROM or a DVD-ROM.

The circuits that execute each process performed by the vehicle 10 (vehicle device 16) may be integrated, and at least a portion of the vehicle 10 (vehicle device 16) may be configured with a semiconductor integrated circuit (chip set, SoC). Alternatively, the circuits that execute each process performed by the roadside device 20 may be integrated, and the roadside device 20 may be configured with a semiconductor integrated circuit (chip set, SoC).

Although one embodiment has been described above in detail with reference to the drawings, the specific configuration is not limited to that described above, and various design changes can be made within the scope of the gist. .

10: Vehicle 11: Wireless communication section 11a: Antenna 11b: Receiving section 11c: Transmitting section 12: GNSS receiver 13: Presenting section 14: Drive control section 15: Control section 16: On-vehicle device 20: Roadside device 21: Wireless communication section 21a: Antenna 21b: Receiving section 21c: Transmitting section 22: Control section 23: Interface 110: Road 120: Railway 130: Level crossing warning device 140: Level crossing barrier 150: Level crossing road 160: Sensor 170: Traffic signal

Claims (7)

A wireless base station installed around a level crossing where railways and roads intersect,
comprising a transmitting unit that transmits a message by wireless communication to a vehicle passing on the road toward the entrance side of the level crossing,
The transmitting unit transmits the message including position information indicating the latitude and longitude of the preceding vehicle on the exit side of the level crossing to the vehicle. The wireless base station according to claim 1, wherein the transmitting unit transmits the message further including direction information indicating the traveling direction of the preceding vehicle to the vehicle. A mobile station installed in a vehicle,
a receiving unit that receives a message by wireless communication from a wireless base station provided around the level crossing when the vehicle passes through the road toward the entrance side of the level crossing where the railway and the road intersect;
The receiving unit receives the message including position information indicating the latitude and longitude of a preceding vehicle on the exit side of the level crossing from the wireless base station. The mobile station. The mobile station according to claim 3 , wherein the receiving unit receives the message further including direction information indicating the traveling direction of the preceding vehicle from the wireless base station. The mobile station according to claim 3 or 4 , further comprising a control unit that performs control to present information indicating a blockage on the road on the exit side of the level crossing to a driver. A vehicle comprising the mobile station according to claim 3 . A wireless base station provided around a level crossing where a railway and a road intersect, comprising a wireless communication step for transmitting a message by wireless communication to vehicles passing on the road toward the entrance side of the level crossing,
In the wireless communication step, the message including position information indicating the latitude and longitude of the preceding vehicle on the exit side of the level crossing is transmitted from the wireless base station to the vehicle.

Images