JPWO2020075839A1 - Transportation communication systems, roadside machines, and methods - Google Patents

Abstract

The traffic communication system includes a roadside unit 200 that performs wireless communication with an object passing through a road. The roadside machine 200 receives information about the first object from the first object, receives information about the second object from the second object, and based on the received information. , Predict whether the first and second objects will be in a given area at the same time in the future. The roadside machine 200 notifies at least the first and second objects of danger when the first and second objects are predicted to exist in the predetermined area at the same time in the future. Send a message for.

Description

The present invention relates to a traffic communication system, a roadside machine, and a method.

In recent years, intelligent transport systems (ITS) have been attracting attention as a technology that can avoid the danger of traffic accidents. As one such system, Non-Patent Document 1 includes a roadside machine which is a base station installed on the roadside and an in-vehicle machine which is a mobile station mounted on a vehicle, and includes a roadside machine and an in-vehicle machine. Describes a system that performs wireless communication.

ARIB STD-T109 1.3 version "700MHz band intelligent transportation system"

A conventionally assumed method of using a roadside unit is, for example, a method of periodically transmitting signal information of a traffic signal provided at an intersection and information on the road shape of an intersection from the roadside unit to an in-vehicle unit.

However, there is room for improvement in the conventionally assumed usage of roadside aircraft in terms of further reducing the possibility of a traffic accident.

Therefore, an object of the present invention is to provide a traffic communication system, a roadside machine, and a method for further reducing the possibility of a traffic accident.

The traffic communication system according to the first aspect includes a roadside unit that performs wireless communication with an object passing through a road. The traffic communication system receives information about the first object from the first object, and receives information about the second object from the second object, and the received communication unit. It includes a control unit that predicts whether or not the first and second objects exist in a predetermined area at the same time in the future based on the information. The control unit notifies at least the first and second objects of danger when the first and second objects are predicted to exist in the predetermined area at the same time in the future. The communication unit is controlled to send a message for.

The roadside machine according to the second aspect performs wireless communication with an object passing through the road. The roadside unit receives information about the first object from the first object, and receives information about the second object from the second object, and the received information. A control unit that predicts whether or not the first and second objects exist in a predetermined area at the same time in the future based on the above. The control unit notifies at least the first and second objects of danger when the first and second objects are predicted to exist in the predetermined area at the same time in the future. The communication unit is controlled to send a message for.

The method according to the third aspect is a method using a roadside machine that performs wireless communication with an object passing through a road, and includes a step of receiving information about the first object from the first object and a step of receiving information about the first object. Based on the step of receiving information about the second object from the second object and the received information, the first and second objects are present in a predetermined area at the same time in the future. A step of predicting whether or not, and when the first and second objects are predicted to exist in the predetermined area at the same time in the future, at least with respect to the first and second objects. It is provided with a step of sending a message for danger notification.

According to one aspect of the present invention, it is possible to provide a traffic communication system, a roadside machine, and a method that further reduce the possibility of a traffic accident.

It is a figure which shows the whole structure example of the traffic communication system which concerns on embodiment. It is a figure which shows an example of the operating environment of the traffic communication system which concerns on embodiment. It is a figure which shows the structural example of the roadside machine which concerns on embodiment. It is a figure which shows the operation example of the traffic communication system which concerns on embodiment.

The transportation communication system according to the embodiment will be described with reference to the drawings. In the description of the drawings below, the same or similar parts are designated by the same or similar reference numerals.

(System configuration example)
FIG. 1 is a diagram showing an overall configuration example of the transportation communication system 1 according to the present embodiment.

As shown in FIG. 1, the traffic communication system 1 has a plurality of vehicles 100 and a plurality of roadside machines 200. In FIG. 1, vehicles 100A and 100B are exemplified as a plurality of vehicles 100, and roadside machines 200A and 200B are exemplified as a plurality of roadside machines 200. Each vehicle 100 is provided with an in-vehicle device 150 that performs wireless communication.

Each roadside machine 200 is installed near the road. The roadside machine 200 may be installed, for example, at an intersection on a general road or on the roadside of an expressway. A road (general road) is a concept including a sidewalk.

The traffic communication system 1 performs road-to-vehicle communication, which is wireless communication between the roadside unit 200 and the vehicle 100. The traffic communication system 1 may perform vehicle-to-vehicle communication, which is wireless communication between vehicles 100, and road-to-road communication, which is wireless communication between roadside units 200. The wireless communication system for these wireless communications may be a wireless communication system conforming to the standard (ARIB STD-T109) described in Non-Patent Document 1.

In the present embodiment, the traffic communication system 1 further performs wireless communication between the roadside unit 200 and a pedestrian terminal (hereinafter, referred to as "pedestrian terminal"). That is, the roadside unit 200 not only performs wireless communication with the vehicle 100, but also performs wireless communication with the pedestrian terminal. The pedestrian terminal may be any terminal as long as it moves with the pedestrian, and is, for example, a smartphone, a tablet terminal, a wearable terminal (for example, a smart watch), or the like.

In the following, the wireless communication performed by the roadside unit 200 with the vehicle 100 will be referred to as "vehicle communication", and the wireless communication performed by the roadside unit 200 with the pedestrian terminal will be referred to as "pedestrian communication".

The communication method for vehicle communication and the communication method for pedestrian communication may be the same communication method or different communication methods from each other. In the following, a case where different communication methods are applied to communication for vehicles and communication for pedestrians will be mainly described. Therefore, the roadside unit 200 supports a plurality of wireless communication methods.

For example, the wireless communication method for vehicle communication is ARIB STD-T109, DSRC (Dedicated Short Range Communications), or 3GPP (Third Generation Partnership Project) compliant C-V2X (Cellular Vehicle) standard. be. On the other hand, the wireless communication method for pedestrian communication is Bluetooth (registered trademark), WLAN (Wireless Local Area Network), or the like.

In FIG. 1, an automobile such as an ordinary automobile or a light automobile is illustrated as the vehicle 100. However, the vehicle 100 may be any vehicle traveling on the road, and may be, for example, a bus, a motorcycle (motorcycle), a bicycle, or the like. The bicycle may be classified as a vehicle when the in-vehicle device 150 is provided on the bicycle, and may be classified as a pedestrian terminal when the driver of the bicycle holds the terminal.

Further, in FIG. 1, the roadside unit 200A is installed on the traffic signal 300 or its support and operates in cooperation with the traffic signal 300. The roadside unit 200A may transmit information (light color switching information, etc.) regarding the traffic signal 300 to the vehicle 100 by communication for the vehicle.

Each roadside unit 200 may be connected to the central device 400 via a network (communication line). The central device 400 may receive vehicle information from each roadside machine 200, including the position, moving speed, and the like of the vehicle 100 received by the roadside machine 200 from the vehicle 100. The central device 400 may further receive vehicle detection information from roadside sensors installed on each road. The central device 400 may collect and process various traffic information based on the received information, and may integrate and manage the traffic communication system 1. For example, the central device 400 transmits a control command instructing the traffic signal 300 to switch the light color, and transmits traffic information including traffic congestion information to the roadside unit 200. Further, the roadside unit 200 may receive information on the terminal of the vehicle 100 or a pedestrian via the central device 400. For example, one of the roadside machines 200 (for example, the roadside machine 200A) is the vehicle information of the vehicle 100 (for example, the vehicle 100B) transmitted by the other roadside machine (for example, the roadside machine 200B) to the central device 400, or walking. Information on the terminal of the person may be received via the central device 400.

FIG. 2 is a diagram showing an example of the operating environment of the transportation communication system 1 according to the present embodiment.

As shown in FIG. 2, the vehicle 100 is passing through the first road, and the pedestrian (pedestrian terminal 500) is passing through the second road. The first road and the second road intersect at an intersection.

The roadside unit 200 performs wireless communication with the vehicle 100 and wireless communication with the pedestrian terminal 500. The vehicle 100 corresponds to the first object passing through the first road, and the pedestrian terminal 500 corresponds to the second object passing through the second road. FIG. 2 shows an example in which the roadside machine 200 is installed at an intersection.

The intersection means an intersection of two or more roads when two or more roads intersect, and includes a crossroad, a T-junction, a three-way junction, and the like. In FIG. 2, a case where the intersection is a T-junction is illustrated. The angle at which two or more roads intersect is not limited to a right angle, and one road may intersect another road at an angle.

The roadside machine 200 receives information about the vehicle 100 from the vehicle 100 by communication for the vehicle. Further, the roadside unit 200 receives information about the pedestrian terminal 500 from the pedestrian terminal 500 by communication for pedestrians.

The roadside machine 200 transmits a message for avoiding the danger of a traffic accident based on the information received from the vehicle 100 and the information received from the pedestrian terminal 500. As a result, the vehicle 100 and the pedestrian terminal 500 are urged to perform a danger avoidance operation.

(Configuration example of roadside machine)
FIG. 3 is a diagram showing a configuration example of the roadside machine 200 according to the present embodiment. As shown in FIG. 2, the roadside unit 200 includes a communication unit 210, a transmission / reception unit 220, a storage unit 230, and a control unit 240.

The communication unit 210 includes a first wireless communication unit 211 for vehicle communication and a second wireless communication unit 212 for pedestrian communication.

The first wireless communication unit 211 performs wireless communication with the vehicle 100 by using the first wireless communication method (for example, ARIB STD-T109, DSRC, C-V2X, etc.). Under the control of the control unit 240, the first wireless communication unit 211 converts the radio signal received by the antenna 211a into a baseband signal (received signal) and outputs the radio signal to the control unit 240. Under the control of the control unit 240, the first wireless communication unit 211 converts the baseband signal (transmission signal) output by the control unit 240 into a wireless signal and transmits it from the antenna 211a.

The second wireless communication unit 212 uses a second wireless communication method (for example, Bluetooth (registered trademark) or WLAN, etc.) to perform wireless communication with the pedestrian terminal 500. Under the control of the control unit 240, the second wireless communication unit 212 converts the radio signal received by the antenna 212a into a baseband signal (received signal) and outputs the radio signal to the control unit 240. Under the control of the control unit 240, the second wireless communication unit 212 converts the baseband signal (transmission signal) output by the control unit 240 into a wireless signal and transmits it from the antenna 212a.

The transmission / reception unit 220 transmits / receives information to / from the central device 400 via the network under the control of the control unit 240. The transmission / reception unit 220 may transmit / receive information by wireless communication with the network (for example, cellular communication). The transmission / reception unit 220 may transmit / receive information to / from the traffic signal 300. The transmission / reception unit 220 may transmit / receive information to / from the roadside sensor.

The storage unit 230 includes at least one memory. The storage unit 230 stores a program executed by the control unit 240 and information used for processing by the control unit 240.

The control unit 240 includes at least one processor. The control unit 240 performs various controls on the roadside machine 200. The control unit 240 may include a baseband processor and a CPU. The baseband processor modulates / demodulates and encodes / decodes the baseband signal. The CPU executes a program stored in the storage unit 230 to perform various processes.

The roadside machine 200 configured in this way performs wireless communication with an object passing through the road.

First, the first wireless communication unit 211 receives from the vehicle 100 a first message including information about the vehicle 100. The first wireless communication unit 211 may periodically receive the first message from the vehicle 100.

The first message includes location information indicating the geographical location of the vehicle 100. The position information may be the position information obtained by the GNSS (Global Navigation Satellite System) receiver provided in the vehicle 100. The first message may include speed information indicating the moving speed of the vehicle 100. The first message may include attribute information indicating the attributes of the vehicle 100.

The second wireless communication unit 212 receives from the pedestrian terminal 500 a second message including information about the pedestrian terminal 500. The second wireless communication unit 212 may periodically receive the second message from the pedestrian terminal 500.

The second message includes location information indicating the geographical location of the pedestrian terminal 500. The position information may be the position information obtained by the GNSS receiver provided in the pedestrian terminal 500. The second message may include speed information indicating the moving speed of the pedestrian terminal 500. The second message may include attribute information indicating the attributes of the pedestrian terminal 500 (or pedestrian).

Next, the control unit 240 has the information received by the communication unit 210, specifically, the first message received by the first wireless communication unit 211 and the first message received by the second wireless communication unit 212. Based on the message of 2, it is predicted whether or not the vehicle 100 and the pedestrian terminal 500 exist in a predetermined area at the same time in the future. In the present embodiment, the predetermined area is an intersection where the first road and the second road intersect. The existence of the vehicle 100 and the pedestrian terminal 500 in a predetermined area at the same time in the future means that the vehicle 100 and the pedestrian terminal 500 are present in the predetermined area at a certain time in a continuous time in the future. Alternatively, the vehicle 100 and the pedestrian terminal 500 may be present in a predetermined area between a certain time point and another time point in the continuous time. The predetermined area may be one point on the road, or may be a geographical area including a plurality of points on the road.

For example, the control unit 240 calculates the moving speed of the vehicle 100 based on the position information included in the first message periodically received by the first wireless communication unit 211. The control unit 240 calculates the expected timing at which the vehicle 100 enters the intersection based on the current position and the moving speed of the vehicle 100. Alternatively, the control unit 240 calculates the expected timing at which the vehicle 100 enters the intersection based on the position information and the speed information included in the first message received by the first wireless communication unit 211. The control unit 240 may calculate the moving direction of the vehicle 100 and calculate the expected timing at which the vehicle 100 enters the intersection only when it is determined that the vehicle 100 is moving toward the intersection.

Further, the control unit 240 calculates the moving speed of the pedestrian terminal 500 based on the position information included in the second message periodically received by the second wireless communication unit 212. The control unit 240 calculates the expected timing at which the pedestrian terminal 500 enters the intersection based on the current position and the moving speed of the pedestrian terminal 500. Alternatively, the control unit 240 calculates the expected timing at which the pedestrian terminal 500 enters the intersection based on the position information and the speed information included in the second message received by the second wireless communication unit 212. The control unit 240 calculates the moving direction of the pedestrian terminal 500, and determines the expected timing at which the pedestrian terminal 500 enters the intersection only when it is determined that the pedestrian terminal 500 is moving toward the intersection. It may be calculated.

Here, the control unit 240 may accumulate the past movement history of the object and calculate the expected timing of entering the intersection in consideration of the past movement history.

Then, when the predicted timing at which the vehicle 100 enters the intersection and the predicted timing at which the pedestrian terminal 500 enters the intersection overlap, the control unit 240 causes the vehicle 100 and the pedestrian terminal 500 to enter the intersection at the same time in the future. Predict to exist. Here, the term "overlapping" includes not only the case where the expected timings completely match, but also the case where the difference between the expected timings is within a predetermined time.

Next, the control unit 240 sends a message for danger notification to at least the vehicle 100 and the pedestrian terminal 500 when the vehicle 100 and the pedestrian terminal 500 are predicted to be present at the intersection at the same time in the future. Hereinafter, the communication unit 210 is controlled so as to transmit a “danger notification message”). As a result, the vehicle 100 and the pedestrian terminal 500 can be encouraged to perform a danger avoidance operation, so that the possibility of a traffic accident can be reduced.

Further, the control unit 240 stopped the vehicle 100 from at least one of the position information and the speed information included in the first message between the time when the predicted timing was calculated and the time when the predicted timing was reached (the control unit 240 stopped the vehicle 100). If it is determined that the possibility of not being present at the intersection has increased at the same time in the future), information indicating that the danger notified by the transmitted danger notification message has been avoided has been increased is transmitted to the vehicle 100 and the pedestrian terminal 500. You may. The control unit 240 stopped the pedestrian terminal 500 from at least one of the position information and the speed information included in the second message between the time when the predicted timing was calculated and the time when the predicted timing was reached. If it is determined that the possibility of not being present at the intersection has increased at the same time in the future), information indicating that the danger notified by the transmitted danger notification message has been avoided has increased is transmitted to the vehicle 100 and the pedestrian terminal 500. You may.

In particular, the wireless communication method used by the vehicle 100 and the wireless communication method used by the pedestrian terminal 500 are different, and even when the vehicle 100 and the pedestrian terminal 500 cannot directly communicate with each other, a plurality of wireless communication methods By interposing the roadside machine 200 corresponding to the above, the possibility of a traffic accident can be reduced.

The control unit 240 may transmit the danger notification message by broadcasting or multicast, or may transmit the danger notification message by unicast. In the following, the case where the danger notification message is transmitted by unicast will be mainly described.

For example, the control unit 240 transmits a danger notification message including information indicating the approach of the pedestrian terminal 500 (pedestrian) to the vehicle 100, and sends a danger notification message including information indicating the approach of the vehicle 100 to the pedestrian terminal 500. The communication unit 210 may be controlled so as to transmit to. As a result, the content of the danger can be specifically notified, and an appropriate danger avoidance operation can be promoted.

(System operation example)
FIG. 4 is a diagram showing an operation example of the transportation communication system 1 according to the present embodiment.

As shown in FIG. 4, in step S101, the vehicle 100 transmits the first message to the roadside machine 200. The first wireless communication unit 211 of the roadside unit 200 receives the first message.

In step S102, the pedestrian terminal 500 transmits a second message to the roadside machine 200. The second wireless communication unit 212 of the roadside unit 200 receives the second message. Note that FIG. 4 illustrates an example in which the roadside machine 200 receives the first message and the second message at the same time, but the roadside machine 200 receives the timing of receiving the first message and the second message. The timing may be different from each other.

In step S103, the control unit 240 of the roadside machine 200 determines the reliability level indicating the high reliability of the information received from the object (vehicle 100, pedestrian terminal 500).

For example, the control unit 240 of the roadside unit 200 refers to the map information stored in the storage unit 230 in advance or the map information received by the transmission / reception unit 220 from the network, and the position information included in the received message is the position on the road. It is determined that the reliability level of the position information is low when the distance from the location information is large. The confidence level may be two levels of "high" or "low", or may be three or more levels.

Alternatively, when the control unit 240 of the roadside machine 200 receives the message at the first timing and the second timing, the control unit 240 is based on the position, speed (and direction) determined according to the message received at the first timing. , Predict the position of the object at the second timing. Then, when the position indicated by the message received at the second timing is far from the predicted position, it is determined that the reliability level is low.

Alternatively, when the object is the vehicle 100, the control unit 240 of the roadside machine 200 calculates the offset between the position of the vehicle 100 and the center position of the road a plurality of times, and the stability of the offset is low. , Judge that the reliability level is low.

Alternatively, when the control unit 240 of the roadside machine 200 determines that the pedestrian or the driver is a person who cannot read the behavior (children, elderly people, etc.) based on the attribute information included in the message, the reliability level is set. It may be determined that it is low.

These determination methods may be used for determining the danger level described later.

The process of step S103 may be performed after step S105.

In step S104, the control unit 240 of the roadside machine 200 corrects the position information included in the received message. For example, when the position information included in the received message is slightly distant from the position on the road, the control unit 240 of the roadside unit 200 corrects the position information so that the position information is set to the position on the road. However, step S104 is a process performed as needed, and is not an essential process.

Alternatively, the control unit 240 of the roadside machine 200 is set to the original location when the position suddenly deviates from the original location (position) expected from the history of past data (position history) and the moving speed. It may be corrected.

Alternatively, the control unit 240 of the roadside machine 200 is relative to two vehicles (preceding vehicle and following vehicle) whose position accuracy is known to be high, based on the positions of the two vehicles. The position may be corrected to.

Alternatively, when one vehicle also notifies the roadside machine 200 of the positions of neighboring vehicles, the control unit 240 of the roadside machine 200 may correct the position based on the notification.

In step S105, the control unit 240 of the roadside machine 200 predicts whether the vehicle 100 and the pedestrian terminal 500 will be present at the intersection at the same time in the future, based on the received message. Note that the processing after step S105 may be performed only when the vehicle 100 and the pedestrian terminal 500 are predicted to exist at the intersection at the same time in the future. In the following, the description will be continued assuming that the vehicle 100 and the pedestrian terminal 500 are predicted to be present at the intersection at the same time in the future.

In step S106, the control unit 240 of the roadside machine 200 determines the attributes of the object (each of the vehicle 100 and the pedestrian terminal 500), the moving speed of the object, and the distance between the object and the intersection. Based on at least one of the distances, the risk level indicating the high risk is determined. The risk level may be two levels of "high" or "low", or may be three or more levels.

For example, the control unit 240 of the roadside machine 200 determines that the danger level is high when the pedestrian terminal 500 indicates that the pedestrian corresponding to the pedestrian terminal 500 is a vulnerable person (children, elderly people) as an attribute of the pedestrian terminal 500. You may.

As an attribute of the vehicle 100, the control unit 240 of the roadside machine 200 may determine that the danger level is high when the vehicle 100 is a large vehicle (for example, a truck or a bus).

The control unit 240 of the roadside machine 200 determines that the danger level is high when the moving speed of the vehicle 100 is higher than the first threshold value and / or when the moving speed of the pedestrian terminal 500 is higher than the second threshold value. You may. Here, the control unit 240 of the roadside machine 200 may determine that the vehicle 100 is traveling dangerously when the moving speed of the vehicle 100 is higher than the first threshold value.

The control unit 240 of the roadside machine 200 determines that the danger level is high when the moving speed of the vehicle 100 is higher than the first threshold value and / or when the moving speed of the pedestrian terminal 500 is higher than the second threshold value. You may.

The control unit 240 of the roadside machine 200 may determine that the danger level is high when the distance between the pedestrian terminal 500 and the intersection is shorter than the threshold value.

In step S107, the control unit 240 of the roadside machine 200 controls the first wireless communication unit 211 so as to transmit the danger notification message to the vehicle 100. Here, the control unit 240 of the roadside machine 200 may include approach notification information indicating the approach of the pedestrian terminal 500 (pedestrian) in the danger notification message. Further, when the control unit 240 of the roadside machine 200 determines in step S106 that the vehicle 100 is traveling dangerously, the control unit 240 transmits a danger notification to the vehicle 100 instructing the vehicle 100 to stop or slow down. It may be included in the message.

In step S108, the control unit 240 of the roadside unit 200 controls the second wireless communication unit 212 so as to transmit the danger notification message to the pedestrian terminal 500. Here, the control unit 240 of the roadside machine 200 may include approach notification information indicating the approach of the vehicle 100 in the danger notification message. The approach notification information includes, for example, detailed information of the vehicle 100 indicating the vehicle type of the vehicle 100, what kind of dangerous driving the vehicle 100 is doing, and time information indicating when the vehicle 100 contacts the pedestrian terminal 500. , The position information indicating the position where the vehicle 100 comes into contact with the pedestrian terminal 500 may be included.

The control unit 240 of the roadside machine 200 may include the danger level information indicating the danger level determined in step S106 in the danger notification message. The danger level information may be a 1-bit flag indicating that the danger level is “high” or “low”, or may be an index value indicating the danger level.

The control unit 240 of the roadside machine 200 may include the trust level information indicating the trust level determined in step S103 in the danger notification message. The trust level information may be a 1-bit flag indicating that the trust level is "high" or "low", or may be an index value indicating the trust level. When the position information is corrected in step S104, the control unit 240 of the roadside machine 200 may include information (1 bit flag) indicating that the position information has been corrected in the danger notification message. Alternatively, the control unit 240 of the roadside machine 200 may lower the reliability level information (reliability level) when the position information is corrected in step S104.

In step S109, the vehicle 100 determines whether or not to perform the danger avoidance operation and / or the content of the danger avoidance operation in response to receiving the danger notification message from the roadside machine 200.

In step S110, the pedestrian terminal 500 determines whether or not to perform the danger avoidance operation and / or the content of the danger avoidance operation in response to receiving the danger notification message from the roadside device 200.

Here, each of the vehicle 100 and the pedestrian terminal 500 may have different operations when receiving the danger notification message, depending on the danger level information included in the danger notification message. Further, each of the vehicle 100 and the pedestrian terminal 500 may have different operations when receiving the danger notification message, depending on the reliability level information included in the danger notification message.

For example, each of the vehicle 100 and the pedestrian terminal 500 may determine that the danger avoidance operation is performed only when the danger level indicated by the danger level information is high and / or the reliability level indicated by the reliability level information is high. ..

Alternatively, the vehicle 100 may activate the automatic brake as a danger avoidance operation when the danger level is high and / or the reliability level is high. When the danger level is low and / or the reliability level is low, the vehicle 100 may alert the driver by voice or image as a danger avoidance operation without operating the automatic brake.

The pedestrian terminal 500 may have different audio, video, and / or vibration output modes depending on the danger level and / or the reliability level. For example, when the danger level is high and / or the reliability level is high, the pedestrian terminal 500 may alert the pedestrian by outputting a loud voice as a danger avoidance operation. When the danger level is low and / or the reliability level is low, the pedestrian terminal 500 may alert the pedestrian only by vibration as a danger avoidance operation.

In step S111, the vehicle 100 performs the danger avoidance operation determined in step S109.

In step S112, the pedestrian terminal 500 performs the danger avoidance operation determined in step S110.

(Other embodiments)
In the above-described embodiment, an example in which the first object is the vehicle 100 and the second object is the pedestrian terminal 500 has been described, but both the first object and the second object are vehicles. It may be. When both the first object and the second object are vehicles, the roadside machine 200 does not have to have the second radio communication unit 212.

Further, in the above-described embodiment, an example in which the roadside machine 200 is a roadside machine with an integrated antenna and a main body has been described, but a roadside machine with a separate antenna and a main body may be used. In the roadside unit having a separate antenna and main body, the antenna portion may be installed around the road, the main body portion may be installed away from the road, and the antenna portion and the main body portion may be connected via a cable.

Further, in the above-described embodiment, an example in which the roadside machine 200 performs centralized control has been described, but the roadside machine 200 and the central device 400 may perform distributed control. Specifically, among the operations according to the above-described embodiment, even if the roadside unit 200 performs wireless communication with the vehicle 100 and wireless communication with the pedestrian terminal 500, and the central device 400 performs various controls and processes. good. That is, the central device 400 may perform the control and processing performed by the control unit 240 of the roadside machine 200 in the above-described embodiment instead of the roadside machine 200. However, from the viewpoint of performing real-time control, it is desirable that the roadside machine 200 performs centralized control.

Further, in the above-described embodiment, the predetermined area has been described as an example of an intersection where the first road and the second road intersect, but the predetermined area may be located on one road. Specifically, the control unit 240 determines that the first vehicle and the second vehicle will be moved at the same time in the future based on the current positions, moving speeds, and moving directions of the first vehicle and the second vehicle. It may be predicted that it exists in a predetermined area located on one road. The control unit 240 may calculate the current position, moving speed, and moving direction of the first vehicle and the second vehicle based on the first message received from the first vehicle and the second vehicle, respectively. .. For example, when the second vehicle collides with the first vehicle in the future when the first vehicle is the following vehicle, the first vehicle and the second vehicle will collide with the first vehicle at the same time in the future. , Exists in a predetermined area located on one road. For example, if the second vehicle is an oncoming vehicle of the first vehicle, when the second vehicle collides head-on with the first vehicle in the future, the first vehicle and the second vehicle will have the same time in the future. In addition, it can be said that it exists in a predetermined area located on one road.

Further, the control unit 240 exists in a predetermined area where the vehicle and the pedestrian terminal are located on one road at the same time in the future, based on the current position, the moving speed, and the moving direction of the vehicle and the pedestrian terminal. Then you can predict. The control unit 240 may calculate the current position, moving speed, and moving direction of the vehicle and the pedestrian terminal based on the first message received from the vehicle and the second message received from the pedestrian terminal. For example, if a pedestrian is located in front of the vehicle on one road, then when the vehicle collides with the pedestrian terminal (to the user) in the future, the vehicle and the pedestrian terminal will have one at the same time in the future. It can be said that it exists in a predetermined area located on the road.

Although the embodiments have been described in detail with reference to the drawings, the specific configuration is not limited to the above, and various design changes and the like can be made within a range that does not deviate from the gist.

The present application claims the priority of Japanese Patent Application No. 2018-193867 (filed on October 12, 2018), the entire contents of which are incorporated in the specification of the present application.

Claims (14)

A traffic communication system having a roadside unit that performs wireless communication with an object passing through a road.
A communication unit that receives information about the first object from the first object and receives information about the second object from the second object.
A control unit that predicts whether or not the first and second objects will exist in a predetermined area at the same time in the future based on the received information.
The control unit notifies at least the first and second objects of danger when the first and second objects are predicted to exist in the predetermined area at the same time in the future. A traffic communication system that controls the communication unit to send a message for. The information regarding the first object includes position information indicating the geographical position of the first object.
The information regarding the second object includes position information indicating the geographical position of the second object.
The traffic communication according to claim 1, wherein the control unit predicts whether or not the first and second objects are present in the predetermined area at the same time in the future based on at least the position information. system. The predetermined area is an intersection where the first road and the second road intersect.
The first object is an object passing through the first road.
The traffic communication system according to claim 1 or 2, wherein the second object is an object passing through the second road and is located in front of or behind the first object. The transportation communication system according to any one of claims 1 to 3, wherein one of the first and second objects is a vehicle and the other is a pedestrian terminal. The communication unit
With the first wireless communication unit that performs wireless communication with the vehicle using the first wireless communication method,
The traffic communication system according to claim 4, further comprising a second wireless communication unit that performs wireless communication with the pedestrian terminal using a second wireless communication system different from the first wireless communication system. The control unit transmits the message including information indicating the approach of the second object to the first object, and sends the message including information indicating the approach of the first object to the first object. The traffic communication system according to any one of claims 1 to 5, which controls the communication unit so as to transmit to the object of 2. The control unit
For each of the first and second objects, the risk is based on at least one of the attributes of the object, the moving speed of the object, and the distance between the object and the predetermined area. Determine the risk level that indicates the height of
The traffic communication system according to any one of claims 1 to 6, which controls the communication unit so as to transmit the message including the danger level information indicating the determined danger level. The transportation communication system according to claim 7, wherein each of the first and second objects makes the operation at the time of receiving the message different according to the danger level information included in the message. The control unit
When at least one of the first and second objects is a vehicle, it is determined whether or not the vehicle is traveling dangerously based on the moving speed of the vehicle.
Claims 1 to 2 for controlling the communication unit so as to transmit the message including information instructing the stop or speed reduction of the vehicle to the vehicle when it is determined that the vehicle is traveling in danger. 8. The transportation communication system according to any one of 8. The control unit
For each of the first and second objects, the reliability level indicating the high reliability of the information received from the object is determined.
The traffic communication system according to any one of claims 1 to 9, which controls the communication unit so as to transmit the message including the trust level information indicating the determined trust level. The transportation communication system according to claim 10, wherein each of the first and second objects makes an operation at the time of receiving the message different according to the trust level information included in the message. The traffic communication system according to any one of claims 1 to 11, wherein the communication unit and the control unit are provided on the roadside machine. It is a roadside machine that performs wireless communication with an object passing through the road.
A communication unit that receives information about the first object from the first object and receives information about the second object from the second object.
A control unit that predicts whether or not the first and second objects will exist in a predetermined area at the same time in the future based on the received information.
The control unit notifies at least the first and second objects of danger when the first and second objects are predicted to exist in the predetermined area at the same time in the future. A roadside machine that controls the communication unit to send a message for. It is a method using a roadside machine that performs wireless communication with an object passing through the road.
A step of receiving information about the first object from the first object, and
A step of receiving information about the second object from the second object, and
Based on the received information, a step of predicting whether or not the first and second objects will exist in a predetermined area at the same time in the future, and
When the first and second objects are predicted to exist in the predetermined area at the same time in the future, at least the first and second objects are sent a message for danger notification. How to have a step to send and.

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