Traffic communication system, vehicle, wireless roadside unit, and traffic communication program

Abstract

To provide a traffic communication system, vehicle, wireless road side machine, and traffic communication program capable of reducing the risk of a collision between an overtaking vehicle and a stopped vehicle.SOLUTION: There is provided a traffic communication system. The traffic communication system includes a first vehicle being the stopped vehicle, a second vehicle to take over the first vehicle, and a first wireless communication section. The first wireless communication section of the traffic communication system transmits door state information related to an opening / closing state of a door of the first vehicle by broadcasting. The second vehicle of the traffic communication system receives the door state information.SELECTED DRAWING: Figure 4

Description

[Technical Field]

[0001] The present invention relates to a traffic communication system, a vehicle, a wireless roadside unit, and a traffic communication program. [Background technology]

[0002] In recent years, Intelligent Transport Systems (ITS) have been attracting attention as a technology that can prevent the risk of traffic accidents (for example, Non-Patent Document 1 below). In an ITS, road-to-vehicle communication may be performed between a wireless roadside device installed on the roadside and an on-board communication device installed in a vehicle. In an ITS, vehicle-to-vehicle communication may also be performed between on-board communication devices. In a road traffic system, road-to-vehicle communication or vehicle-to-vehicle communication can prevent traffic accidents and even facilitate smooth traffic flow.

[0003] On the other hand, there is a technology that can prevent a vehicle door from coming into contact with an obstacle, for example: a vehicle door system that detects whether the vehicle is stopped or not and acquires the current position of the vehicle using a navigation system to grasp the situation around the vehicle, and controls the door opening angle and displays a door open sign on a door open sign display unit according to the situation (for example, Patent Document 1 below). [Prior art documents] [Non-patent literature]

[0004] [Non-Patent Document 1] ARIB STD-T109 Version 1.3 "700MHz Band Intelligent Transport Systems" [Patent documents]

[0005] [Patent Document 1] Patent No. 4985967 Summary of the Invention [Problem to be solved by the invention]

[0006] The vehicle door system described in Patent Document 1 controls the door of the host vehicle in order to avoid a collision between the door of the host vehicle and an obstacle. In such a vehicle door system, if the host vehicle is unable to control the door normally due to a malfunction, there is a risk that the collision between the door of the host vehicle and an obstacle cannot be avoided. In other words, if an overtaking vehicle is trying to overtake the host vehicle that is stopped on the road and the door of the host vehicle suddenly opens, the overtaking vehicle may come into contact with the host vehicle.

[0007] Therefore, the present disclosure provides a traffic communication system, a vehicle, a wireless roadside unit, and a traffic communication program that can reduce the risk of a collision between an overtaking vehicle and a stopped vehicle. [Means for solving the problem]

[0008] A traffic communication system according to a first aspect includes a first vehicle that is stopped, a second vehicle that is overtaking the first vehicle, and a first wireless communication unit. In the traffic communication system, the first wireless communication unit broadcasts door status information regarding the open / closed status of the doors of the first vehicle. In addition, in the traffic communication system, the second vehicle receives the door status information.

[0009] A vehicle according to a second aspect includes a wireless communication unit that broadcasts door state information relating to the open / closed state of the doors of the vehicle when the vehicle is stopped.

[0010] A wireless roadside device according to a third aspect includes a wireless communication unit that broadcasts door state information relating to the open / closed state of the doors of a parked vehicle.

[0011] A traffic communication program according to a fourth aspect causes a traffic communication system to perform a process of broadcasting door status information regarding the open / closed status of the doors of a first vehicle, which is a stopped vehicle, and a process of a second vehicle overtaking the first vehicle receiving the door status information. [Effects of the Invention]

[0012] According to the present disclosure, it is possible to provide a traffic communication system, a vehicle, a wireless roadside device, and a traffic communication program that can reduce the risk of a collision between an overtaking vehicle and a stopped vehicle. [Brief explanation of the drawings]

[0013] [Figure 1] FIG. 1 is a diagram illustrating an example of the configuration of a transportation communication system according to the first embodiment. [Figure 2] FIG. 2 is a diagram illustrating an example of allocation of road-to-vehicle communication periods according to the first embodiment. [Figure 3] FIG. 3 is a diagram illustrating an example of the configuration of a stopped vehicle and an overtaking vehicle according to the first embodiment. [Figure 4] FIG. 4 is a diagram illustrating an example of operation according to the first embodiment. [Figure 5] FIG. 5 is a diagram illustrating an example of the configuration of a transportation communication system according to the second embodiment. [Figure 6] FIG. 6 is a diagram illustrating an example of the configuration of a stopped vehicle and an overtaking vehicle according to the second embodiment. [Figure 7] FIG. 7 is a diagram illustrating an example of operation according to the second embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0014] [First embodiment] Hereinafter, embodiments will be described with reference to the drawings. In the description of the drawings, the same or similar parts are denoted by the same or similar reference numerals.

[0015] (Example of a traffic communication system configuration) First, a configuration example of a transportation communication system according to the first embodiment will be described. In the following, a transportation communication system based on the standard of Non-Patent Document 1 will be mainly described as a transportation communication system, but the transportation communication system is not limited to this standard. For example, the transportation communication system may perform wireless communication based on the V2X (Vehicle to Everything) standard of the Third Generation Partnership Project (3GPP). Note that 3GPP is a registered trademark.

[0016] 1 is a diagram illustrating an example of the configuration of a transportation communication system 10 according to a first embodiment. As illustrated in FIG. 1, the transportation communication system 10 includes a stopped vehicle 100-1 (e.g., a first vehicle) and an overtaking vehicle 100-2 (e.g., a second vehicle).

[0017] The stopped vehicle 100-1 is, for example, a vehicle that is temporarily stopped on a road. The stopped vehicle 100-1 may be, for example, a vehicle parked in a parking space or a parking lot. Note that "parked" means that the vehicle is continuously stopped. The stopped vehicle 100-1 may be, for example, a vehicle that has a person inside and is expected to be driven in the future, and may be a parked vehicle.

[0018] The overtaking vehicle 100-2 is a vehicle that overtakes the stopped vehicle 100-1 on the road. The overtaking vehicle 100-2 may be a vehicle that is about to overtake the stopped vehicle 100-1 on the road. The overtaking vehicle 100-2 is also a moving vehicle.

[0019] 1 shows an example in which the direction in which stopped vehicle 100-1 intends to travel after stopping is the same as the direction in which overtaking vehicle 100-2 is traveling, but this is not limiting. For example, the direction in which stopped vehicle 100-1 intends to travel may be opposite to the direction in which overtaking vehicle 100-2 is traveling. Such a situation occurs, for example, on a one-way, one-lane road.

[0020] 1, stopped vehicle 100-1 and overtaking vehicle 100-2 are illustrated as automobiles such as standard cars or light cars, but stopped vehicle 100-1 may be any vehicle that has doors and travels on a road, such as an autonomous vehicle. Overtaking vehicle 100-2 may be any vehicle that travels on a road, such as a two-wheeled motorbike or an autonomous vehicle.

[0021] 1 shows an example in which there is one stopped vehicle 100-1, but there may be multiple stopped vehicles 100-1. Also, in the example in FIG. 1, there is an example in which there is one overtaking vehicle 100-2, but there may be multiple stopped vehicles 100-1.

[0022] In the following description, when there is no particular need to distinguish between the stopped vehicle 100-1 and the overtaking vehicle 100-2, they may be referred to as vehicle 100.

[0023] 1, stopped vehicle 100-1 has an on-board communication device 150-1. Also, overtaking vehicle 100-2 has an on-board communication device 150-2. In traffic communication system 10 according to the first embodiment, vehicle-to-vehicle communication is performed between on-board communication device 150-1 of stopped vehicle 100-1 and on-board communication device 150-2 of overtaking vehicle 100-2.

[0024] For example, the on-board communication device 150-1 of the stopped vehicle 100-1 and the on-board communication device 150-2 of the overtaking vehicle 100-2 share a carrier frequency (frequency band) of 700 MHz with the wireless roadside device in a time-division manner. That is, in a predetermined frequency band of 700 MHz, road-to-vehicle communication and inter-vehicle communication are used in a time-division manner. For example, during a road-to-vehicle communication period, road-to-vehicle communication is performed between the wireless roadside device and the on-board communication devices 150-1 and 150-2 of the vehicle 100. Also, for example, during a period other than the road-to-vehicle communication period (i.e., the inter-vehicle communication period), inter-vehicle communication is performed between the on-board communication devices 150-1 and 150-2 of the vehicle 100.

[0025] (Roadside-to-vehicle communication period and vehicle-to-vehicle communication period) Next, a description will be given of a road-to-vehicle communication period in the transportation communication system 10 according to the first embodiment. Fig. 2 is a diagram showing an example of a road-to-vehicle communication period.

[0026] As shown in Figure 2, road-to-vehicle communication periods are based on communication at 100 ms intervals (called "control periods"). Within a 100 ms control period, 16 μs is the control unit time (called a "unit"), and a control period consists of 6,250 units. The maximum number of road-to-vehicle communication periods that can be set within one control period is "16," and road-to-vehicle communication periods are placed at intervals of 390 units (6,240 μs) from the beginning of the control period. The maximum length of one road-to-vehicle communication period that can be set is 189 units (3,024 μs).

[0027] Each wireless roadside device is assigned one or more roadside-vehicle communication periods out of 16 roadside-vehicle communication periods within one control period. The wireless roadside device broadcasts roadside-vehicle messages at predetermined intervals using the roadside-vehicle communication period assigned to it. This predetermined period is, for example, an integer multiple of the control period. The roadside-vehicle message includes information related to the roadside-vehicle communication period. Specifically, the wireless roadside device secures its own transmission time during the roadside-vehicle communication period by transmitting a roadside-vehicle message including the transmission time and roadside-vehicle communication period information (number of transfers and roadside-vehicle communication period length) as its own transmission information to the surrounding in-vehicle communication devices 150-1 and 150-2. At this time, the wireless roadside device sets a transmission prohibition period during periods other than the roadside-vehicle communication period.

[0028] The in-vehicle communication devices 150-1 and 150-2 that receive the road-to-vehicle message synchronize time based on the transmission time included in the road-to-vehicle message, set a transmission prohibition period during the road-to-vehicle communication period based on the road-to-vehicle communication period information included in the road-to-vehicle message, and transmit at a timing other than the transmission prohibition period during the road-to-vehicle communication period.

[0029] That is, during the road-to-vehicle communication period, the in-vehicle communication devices 150-1 and 150-2 perform road-to-vehicle communication by broadcasting a vehicle information message during periods other than the transmission prohibition period that they themselves have set. Also, since the wireless roadside device sets a transmission prohibition period during periods other than the road-to-vehicle communication period (i.e., periods during which vehicle-to-vehicle communication is performed), the in-vehicle communication devices 150-1 and 150-2 can perform vehicle-to-vehicle communication by broadcasting a vehicle information message during periods other than the road-to-vehicle communication period.

[0030] The vehicle information message is a message that includes information about the vehicle 100. The vehicle information message has a predetermined format (e.g., "ITS Connect TD-001 version 1.0") that complies with, for example, the "ITS Connect System Vehicle-to-Vehicle Communication Message Specification" issued by the ITS Connect Promotion Council. ITS Connect is a registered trademark.

[0031] As mentioned above, the road-to-vehicle message includes information about the road-to-vehicle communication period. The road-to-vehicle message has a predetermined format that conforms to, for example, the "ITS Wireless Roadside Unit Communication Application Common Standard" and the "5.8 GHz Band / 700 MHz Band Wireless DSSS Communication Application (Optical and Radio Wave Experiment) Standard" issued by the UTMS (Universal Traffic Management System) Association. UTMS is a registered trademark.

[0032] As described above, in the transportation communication system 10 according to the first embodiment, the on-board communication devices 150-1 and 150-2 perform vehicle-to-vehicle communication, but may also perform road-to-vehicle communication with a wireless roadside device. An example in which the on-board communication devices 150-1 and 150-2 perform road-to-vehicle communication with a wireless roadside device will be described in the second embodiment.

[0033] (Example of a configuration of stopped vehicles and overtaking vehicles) Next, a description will be given of a configuration example of the stopped vehicle 100-1 and the overtaking vehicle 100-2 according to the first embodiment. Fig. 3 is a diagram showing a configuration example of the stopped vehicle 100-1 and the overtaking vehicle 100-2.

[0034] 3, the stopped vehicle 100-1 includes a door state acquisition unit 110 and an in-vehicle communication device 150-1. The in-vehicle communication device 150-1 includes a wireless communication unit 120 and an antenna .

[0035] The door state acquisition unit 110 acquires door state information relating to the open / closed state of the doors of the stopped vehicles. The door state information may include information indicating that the doors of the stopped vehicle 100-1 are closed. The door state information may also include information indicating that the doors of the stopped vehicle 100-1 are about to open. A "sign" that the doors will open refers to a state in which it is predicted that the doors of the stopped vehicle 100-1 will be opened by a person sitting in the stopped vehicle 100-1 (or a state in which a person is about to open the doors). Furthermore, the door state information may include information indicating that the doors of the stopped vehicle 100-1 have (actually) opened.

[0036] First, the door status acquisition unit 110 may include a sensor provided on the door handle of the stopped vehicle 100-1. The sensor may be a switch-type (or touch-type) sensor that turns on when a person touches the door handle and turns off when the person does not touch the door handle. Alternatively, the sensor may be a sensor provided near the door handle and detects that a person has touched the door handle when a person touches a light using an optical method, and detects that a person has not touched the door handle when the person does not touch the light. When the door status acquisition unit 110 detects that a person has touched the door handle using the sensor, the door status acquisition unit 110 may generate door status information including information indicating that the door is about to open, or may generate door status information including information indicating that the door is open. Furthermore, when the door status acquisition unit 110 detects that a person is not touching the door handle using the sensor, the door status acquisition unit 110 may generate door status information including information indicating that the door of the stopped vehicle 100-1 is closed.

[0037] Second, the door status acquisition unit 110 may include a sensor provided on the door of the stopped vehicle 100-1 itself. The sensor may also be a switch-type (or touch-type) sensor or a sensor that detects by an optical method. The sensor may be a sensor that detects the opening and closing of the door of the stopped vehicle 100-1. When the sensor detects that a person has touched the door, the door status acquisition unit 110 may generate door status information including information indicating that the door is about to open. Furthermore, when the sensor detects that the door has opened, the door status acquisition unit 110 may generate door status information including information indicating that the door is open. Furthermore, when the sensor detects that the door has closed, the door status acquisition unit 110 may generate door status information including information indicating that the door is closed.

[0038] The door state acquisition unit 110 acquires the door state information by generating the door state information, and outputs the acquired door state information to the wireless communication unit 120.

[0039] The wireless communication unit 120 broadcasts the door status information. The wireless communication unit 120 converts (upconverts) the door status information into a wireless signal in a wireless band and outputs the wireless signal to the antenna 130. The antenna 130 transmits the wireless signal. The wireless communication unit 120 performs vehicle-to-vehicle communication using a wireless communication method described in Non-Patent Document 1. However, the wireless communication unit 120 may perform vehicle-to-vehicle communication using a wireless communication method conforming to the 3GPP V2X standard, or may perform vehicle-to-vehicle communication using a wireless communication method conforming to a wireless LAN standard such as the IEEE (Institute of Electrical and Electronics Engineers) 802.11 series. The wireless communication unit 120 may transmit the door status information by broadcasting a vehicle information message including the door status information. IEEE is a registered trademark.

[0040] 3, the overtaking vehicle 100-2 has an in-vehicle communication device 150-2 and a display unit 180. The in-vehicle communication device 150-2 has an antenna 160 and a wireless communication unit 170.

[0041] The antenna 160 receives the radio signal transmitted from the stopped vehicle 100-1. The wireless communication unit 170 converts (down-converts) the radio signal in the radio band into a baseband signal in the baseband band. The wireless communication unit 170 extracts door status information from the baseband signal and outputs the door status information to the display unit 180. In this way, the wireless communication unit 170 receives the door status information broadcast from the in-vehicle communication device 150-1 of the stopped vehicle 100-1.

[0042] The display unit 180 displays information according to the door state information.

[0043] First, for example, when the door status information includes information indicating that the doors of stopped vehicle 100-1 are closed, display unit 180 displays a safety indication indicating that it is safe. Regarding the safety indication, it is sufficient that information indicating that stopped vehicle 100-1 is safe is displayed on display unit 180, and it may be displayed as text information, image information, or text information and image information may be displayed simultaneously. Alternatively, the safety indication may be displayed on display unit 180 together with navigation information.

[0044] Second, the display unit 180 displays an attention-calling display when, for example, the door state information includes information indicating that the door of the stopped vehicle 100-1 is about to open. Regarding the attention-calling display, it is sufficient that information that calls the driver of the overtaking vehicle 100-2's attention to the stopped vehicle 100-1 is displayed on the display unit 180, and the information may be displayed as text information, image information, or text information and image information may be displayed simultaneously. Alternatively, the attention-calling display may be displayed on the display unit 180 together with navigation information.

[0045] Third, the display unit 180 displays an attention-calling display, for example, when the door status information includes information indicating that the door of the stopped vehicle 100-1 is open. The attention-calling display may be the same as the attention-calling display when the door status information includes information indicating a predictive sign, or may be a different attention-calling display. In the case of a different attention-calling display, for example, the following may be possible. That is, the attention-calling display when the door status information includes information indicating a predictive sign may be a display indicating that the door of the stopped vehicle 100-1 is expected to open. Furthermore, the attention-calling display when the door status information includes information indicating that the door is open may be a display indicating that the door of the stopped vehicle 100-1 is open. The attention-calling display may be displayed as text information, as image information, as both text information and image information, or as a combination of text information and image information, or together with navigation information.

[0046] Note that if the overtaking vehicle 100-2 is an autonomous vehicle, a determination unit may be provided instead of the display unit 180. Alternatively, the display unit 180 may include the determination unit. The determination unit makes a safety determination to determine whether the overtaking vehicle 100-2 is safe or not. The determination unit also makes a caution determination to determine whether the overtaking vehicle 100-2 requires caution or not. The determination unit may make the safety determination or caution determination based on sensor information acquired from a sensor provided in the overtaking vehicle 100-2 and door state information acquired from the stopped vehicle 100-1.

[0047] (Operation example according to the first embodiment) Next, an operation example of the traffic communication system 10 according to the first embodiment will be described. Fig. 4 is a diagram showing an operation example of the traffic communication system 10. It is assumed that the stopped vehicle 100-1 and the overtaking vehicle 100-2 receive a road-to-vehicle message from a wireless roadside device, and are in a state where vehicle-to-vehicle communication is possible outside the road-to-vehicle communication period.

[0048] As shown in FIG. 4, in step S10, when the door status acquisition unit 110 of the stopped vehicle 100-1 detects that the door of the stopped vehicle 100-1 is closed, it outputs door status information including information indicating that the door is closed (hereinafter, sometimes referred to as "close information") to the wireless communication unit 120.

[0049] In step S11, the wireless communication unit 120 broadcasts the door state information including the close information. The wireless communication unit 120 may transmit the door state information including the close information as a vehicle information message.

[0050] In step S12, when the wireless communication unit 170 of the overtaking vehicle 100-2 receives the door state information including the close information, the wireless communication unit 170 outputs the door state information to the display unit 180.

[0051] In step S13, the display unit 180 displays a safety indication when it is confirmed that the door state information includes close information. Alternatively, in step S13, the determination unit makes a safety determination when it is confirmed that the door state information includes close information.

[0052] In step S14, the wireless communication unit 120 of the stopped vehicle 100-1 broadcasts the door status information including the close information again in the first cycle. The wireless communication unit 120 repeatedly broadcasts the door status information including the close information in the first cycle, for example, until it receives information other than the close information from the door status acquisition unit 110. Thereafter, every time the wireless communication unit 170 of the overtaking vehicle 100-2 receives the door status information, it outputs the door status information to the display unit 180 (step S15), and the display unit 180 displays a safety message or the determination unit makes a safety determination (step S16).

[0053] In step S20, when the door status acquisition unit 110 detects an indication that the door of the stopped vehicle 100-1 is about to open, it outputs door status information including information indicating an indication that the door of the stopped vehicle 100-1 is about to open (hereinafter, this may be referred to as ``open indication information'') to the wireless communication unit 120.

[0054] In step S21, the wireless communication unit 120 broadcasts the door state information including the open sign information. The wireless communication unit 120 may transmit the door state information including the open sign information as a vehicle information message.

[0055] In step S22, when the wireless communication unit 170 of the overtaking vehicle 100-2 receives the door state information including the open sign information, the wireless communication unit 170 outputs the door state information to the display unit 180.

[0056] In step S23, when the display unit 180 confirms that the door state information includes open sign information, it displays a warning. Alternatively, in step S23, when the determination unit confirms that the door state information includes open sign information, it performs a warning determination.

[0057] In step S24, the wireless communication unit 120 of the stopped vehicle 100-1 again broadcasts the door state information including the open sign information in the second cycle. The wireless communication unit 120 repeatedly broadcasts the door state information including the open sign information in the second cycle, for example, until it receives information other than the open sign information from the door state acquisition unit 110. Thereafter, every time the wireless communication unit 170 of the overtaking vehicle 100-2 receives door state information, it outputs the door state information to the display unit 180 (step S25), and the display unit 180 displays a safety message or the determination unit makes a safety determination (step S26).

[0058] Here, the second period is shorter than the first period. Considering the situation in which the overtaking vehicle 100-2 overtakes, it is assumed that it is basically safe when the door of the stopped vehicle 100-1 is closed. On the other hand, it is assumed that it becomes unsafe when the door of the stopped vehicle 100-1 opens. Therefore, by making the first period longer than the second period, it is possible to reduce the communication resources (wireless bandwidth or battery consumption, etc.) used in the first period compared to when used in the second period, and to make effective use of the communication resources. On the other hand, by making the second period shorter than the first period, it is possible to quickly notify the door state information from the stopped vehicle 100-1 to the overtaking vehicle 100-2 compared to when notifying in the first period.

[0059] In step S30, when the door status acquisition unit 110 detects that the door of the stopped vehicle 100-1 is open, it outputs door status information including information indicating that the door of the stopped vehicle 100-1 is open (hereinafter, this may be referred to as "open information") to the wireless communication unit 120.

[0060] In step S31, the wireless communication unit 120 broadcasts door state information including open information. The wireless communication unit 120 may transmit the door state information including open information as a vehicle information message.

[0061] In step S32, upon receiving the door state information including the open information, the wireless communication unit 170 of the overtaking vehicle 100-2 outputs the door state information to the display unit 180.

[0062] In step S33, when the display unit 180 confirms that the door state information includes open information, it displays a warning. Alternatively, in step S33, when the determination unit confirms that the door state information includes open information, it performs a warning determination.

[0063] In step S34, the wireless communication unit 120 of the stopped vehicle 100-1 broadcasts the door status information including the open information again in the second cycle. The wireless communication unit 120 repeatedly broadcasts the door status information including the open information in the second cycle, for example, until it receives information other than the open information from the door status acquisition unit 110. Thereafter, every time the wireless communication unit 170 of the overtaking vehicle 100-2 receives the door status information, it outputs the door status information to the display unit 180 (step S35), and the display unit 180 displays a safety message or the determination unit makes a safety determination (step S36).

[0064] 4, the period in which the door status information including the open information is broadcast is the second period, which is the same as the period in which the door status information including the open sign information is broadcast, but, for example, the period may be a third period that is shorter than the second period. As a result, the door status information including the open information is transmitted from the stopped vehicle 100-1 to the overtaking vehicle 100-2 more quickly than in the case of the second period, and the driver of the overtaking vehicle 100-2 can also be alerted more quickly.

[0065] The period during which the door state information including the open information is broadcast is shorter than the first period, but may be longer than the second period.

[0066] As described above, in the first embodiment, the wireless communication unit 120 of the stopped vehicle 100-1 broadcasts door state information regarding the open / closed state of the doors of the stopped vehicle 100-1, and the overtaking vehicle 100-2 receives the door state information.

[0067] This allows, for example, the overtaking vehicle 100-2 (or the driver of the overtaking vehicle 100-2) to know whether the door of the stopped vehicle 100-1 is open or closed, and depending on the door open or closed state, can stop the overtaking vehicle 100-2 or move further away from the stopped vehicle 100-1 to overtake it. Thus, the transportation communication system 10 can reduce the risk of a collision between the overtaking vehicle 100-2 and the stopped vehicle 100-1.

[0068] In addition, the door status acquisition unit 110 according to the first embodiment is capable of outputting door status information including not only information indicating that the door is open but also information indicating a sign that the door is about to open, in relation to the opening of the door of the stopped vehicle 100-1.

[0069] This allows, for example, overtaking vehicle 100-2 (or the driver of overtaking vehicle 100-2) to grasp the state not only when the door of stopped vehicle 100-1 is open, but also when there is a sign that the door is about to open. Therefore, compared to when overtaking vehicle 100-2 does not transmit a sign that the door is about to open, it is possible to reduce the risk of a collision between overtaking vehicle 100-2 and stopped vehicle 100-1 when overtaking vehicle 100-2 is about to overtake stopped vehicle 100-1.

[0070] In the operation example shown in Fig. 4, the open sign information and the open information may be processed together without being distinguished. In this case, the door status acquisition unit 110 outputs door status information including the open information, for example, when it detects a sign that the door is about to open or detects that the door is open. The display unit 180 of the overtaking vehicle 100-2 checks the open information and displays a warning. Alternatively, the determination unit of the overtaking vehicle 100-2 checks the open information and makes a warning determination.

[0071] [Second embodiment] Next, a second embodiment will be described. In the second embodiment, differences from the first embodiment will be mainly described. As described above, the second embodiment is an example in which road-to-vehicle communication is performed by a wireless roadside device.

[0072] 5 is a diagram illustrating an example of the configuration of a transportation communication system 10 according to the second embodiment. As shown in FIG.

[0073] 6 is a diagram illustrating an example of the configuration of the wireless roadside device 200 and the overtaking vehicle 100-2. As shown in FIG. 6, the wireless roadside device 200 includes a door state acquisition unit 210, a wireless communication unit 220, and an antenna 230.

[0074] The door state acquisition unit 210 detects the open / closed state of the door of the stopped vehicle 100-1.

[0075] First, the door status acquisition unit 210 may include an image sensor. The image sensor may capture an image of the vicinity of the door of the stopped vehicle 100-1. The image sensor may detect the open / closed state of the door by capturing an image of the vicinity of the door inside the stopped vehicle 100-1. The image sensor may, for example, capture an image of the vicinity of the door and detect a sign that the door is about to open or detect that the door has been opened based on pixel values ​​included in the captured image. Specifically, when the image sensor detects a pixel value representing the color of a human hand or arm near the door or on the door handle, it may generate door status information including open sign information, assuming that this is a sign that the door is about to open. Furthermore, when the image sensor detects a pixel value representing the color of the door of the stopped vehicle 100-1 at a predetermined position (e.g., a road), it may generate door status information including open information, assuming that the door of the stopped vehicle 100-1 is open. Furthermore, when the image sensor does not detect a pixel value representing the color of a human hand or arm near the door or on the door handle, and does not detect a pixel value representing the color of the door of vehicle 100-1 stopped at a predetermined position (for example, a road), the image sensor may generate door state information including "close" information. The image sensor may detect pixel values ​​by machine learning using trained teacher data, or may detect signs of the door opening, detect that the door is open, and detect that the door is closed.

[0076] Second, the door status acquisition unit 210 may include a LiDAR (Light Detection and Ranging) sensor. A LiDAR sensor is a sensor that measures the position and distance of an object by irradiating the object with light, such as ultraviolet light, visible light, or near-infrared light, that has a shorter wavelength than the electromagnetic waves used in radar, and detecting the reflected light. For example, the LiDAR sensor irradiates light near the door of the stopped vehicle 100-1 and, based on the reflected light, detects a sign that the door is about to open, that the door has been opened, or that the door is closed. Specifically, the LiDAR sensor may irradiate light near the door of the stopped vehicle 100-1 and, when it detects, based on the reflected light, that a human hand is placed on the door or door handle, generate door status information including open sign information. Furthermore, the LiDAR sensor may irradiate light near the door of the stopped vehicle 100-1 and, when it detects, based on the reflected light, that the door has been opened from the stopped vehicle 100-1, generate door status information including open information. Furthermore, the LiDAR sensor may generate door status information including close information when it does not detect a human hand on the door or door handle and does not detect that the door has been opened from the stopped vehicle 100-1.

[0077] The door state acquisition unit 210 acquires the door state information by generating the door state information, and outputs the acquired door state information to the wireless communication unit 220.

[0078] The door status acquisition unit 210 according to the second embodiment acquires vehicle information of the stopped vehicle 100-1. The vehicle information of the stopped vehicle 100-1 includes at least position information of the stopped vehicle 100-1 and identification information of the stopped vehicle 100-1. The identification information of the stopped vehicle 100-1 may be any information that can distinguish the stopped vehicle 100-1 from other vehicles, and may be, for example, the vehicle license plate number of the stopped vehicle 100-1. The door status acquisition unit 210 may acquire the position information and identification information of the stopped vehicle 100-1 using an image sensor. For example, the image sensor acquires the position information and identification information of the stopped vehicle 100-1 as follows.

[0079] That is, the image sensor detects the presence of the stopped vehicle 100-1 by continuously detecting pixel values ​​within a certain range over a predetermined area for a predetermined period of time. Then, the image sensor acquires the center position within the predetermined area as position information of the stopped vehicle 100-1. The image sensor also detects pixel values ​​indicating the vehicle license plate number, and detects the vehicle license plate number as identification information of the stopped vehicle 100-1 based on the pixel values.

[0080] The door state acquisition unit 210 outputs the vehicle information acquired in this manner to the wireless communication unit 220 together with the door state information.

[0081] The wireless communication unit 220 broadcasts the door status information and the vehicle information. The wireless communication unit 220 converts (upconverts) the door status information and the vehicle information into wireless signals in a wireless band and outputs the wireless signals to the antenna 230. The antenna 230 broadcasts the wireless signals. The wireless communication unit 220 performs road-to-vehicle communication using the wireless communication method described in Non-Patent Document 1. However, the wireless communication unit 220 may perform road-to-vehicle communication using a wireless communication method conforming to the 3GPP V2X standard, or may perform road-to-vehicle communication using a wireless communication method conforming to a wireless LAN standard such as the IEEE802.11 series. The wireless communication unit 120 may transmit the door status information and the vehicle information by broadcasting a vehicle information message including the door status information and the vehicle information.

[0082] As described above, in the second embodiment, the stopped vehicle 100-1 does not include the door state acquisition unit 110. The wireless roadside device 200 includes the door state acquisition unit 210.

[0083] The configuration example of the overtaking vehicle 100-2 is the same as that of the first embodiment.

[0084] (Example of operation according to the second embodiment) 7 is a diagram illustrating an example of operation according to the second embodiment. It is assumed that the overtaking vehicle 100-2 has received a road-to-vehicle message from the wireless roadside device 200, and road-to-vehicle communication is now possible between the wireless roadside device 200 and the overtaking vehicle 100-2.

[0085] As shown in FIG. 7, the operation example is basically the same as that of the first embodiment, except that vehicle information is transmitted from the wireless roadside device 200 to the overtaking vehicle 100-2.

[0086] That is, in step S50, the door status acquisition unit 210 of the wireless roadside device 200 detects that the door of the stopped vehicle 100-1 is closed, and when it further detects the vehicle information of the stopped vehicle 100-1, it outputs the door status information including the close information and the vehicle information to the wireless communication unit 220.

[0087] In step S51, the wireless communication unit 220 broadcasts the door state information and the vehicle information.

[0088] In step S52, upon receiving the door state information and the vehicle information, the wireless communication unit 170 of the overtaking vehicle 100-2 outputs the door state information and the vehicle information to the display unit 180.

[0089] In step S53, the display unit 180 determines, based on the vehicle information, that the stopped vehicle 100-1 is a vehicle to be overtaken. For example, the display unit 180 may perform the following process. That is, the display unit 180 acquires position information of its own vehicle using a GNSS (Global Navigation Satellite System) receiver provided in the overtaking vehicle 100-2. Then, the display unit 180 compares the position information (transition over time) with the position information of the stopped vehicle 100-1, thereby determining that the stopped vehicle 100-1 is a vehicle that the overtaking vehicle 100-2 is about to overtake. Alternatively, the display unit 180 may determine, from the transition over time of the position information, the direction of the overtaking vehicle 100-2 (or the moving direction of the overtaking vehicle), and determine whether the stopped vehicle 100-1 is a vehicle to be overtaken based on whether the position represented by the position information of the stopped vehicle 100-1 is in that direction. Here, the following description will be given assuming that the stopped vehicle 100-1 is the vehicle to be overtaken.

[0090] In step S53, when the display unit 180 confirms that the door state information includes the close information, it displays a safety display for the stopped vehicle 100-1. Alternatively, in step S53, when the determination unit confirms that the door state information includes the close information, it performs a safety determination.

[0091] In the second embodiment, the wireless communication unit 220 also repeatedly broadcasts the door state information and vehicle information in the first cycle until it receives information other than the close information from the door state acquisition unit 210 (steps S54 to S56).

[0092] In step S60, the door state acquisition unit 210 detects a sign that the door of the stopped vehicle 100-1 is about to open, and when it detects the vehicle information of the stopped vehicle 100-1, it outputs the door state information including the open sign information and the vehicle information to the wireless communication unit 220.

[0093] In step S61, the wireless communication unit 220 broadcasts the door state information and the vehicle information.

[0094] In step S62, upon receiving the door state information and the vehicle information, the wireless communication unit 170 of the overtaking vehicle 100-2 outputs the door state information and the vehicle information to the display unit 180.

[0095] In step S63, the display unit 180 determines that the stopped vehicle 100-1 is a vehicle to be overtaken, based on the vehicle information. The display unit 180 may determine that the stopped vehicle 100-1 is a vehicle to be overtaken, for example, by performing a process similar to that of step S53. In step S63, when the display unit 180 determines that the door state information includes open sign information, it displays a warning about the stopped vehicle 100-1. Alternatively, in step S63, when the determination unit determines that the door state information includes open sign information, it performs a warning determination.

[0096] In the second embodiment, the wireless communication unit 220 also repeatedly broadcasts the door state information and vehicle information in the second cycle until it receives information other than open sign information from the door state acquisition unit 210 (steps S64 to S66).

[0097] In step S70, the door state acquisition unit 210 detects that the door of the stopped vehicle 100-1 is open, and upon detecting the vehicle information of the stopped vehicle 100-1, outputs the door state information including the open information and the vehicle information to the wireless communication unit 120.

[0098] In step S71, the wireless communication unit 120 broadcasts the door state information and the vehicle information.

[0099] In step S72, upon receiving the door state information and the vehicle information, the wireless communication unit 170 of the overtaking vehicle 100-2 outputs the door state information and the vehicle information to the display unit 180.

[0100] In step S73, the display unit 180 determines that the stopped vehicle 100-1 is a vehicle to be overtaken, based on the vehicle information. The display unit 180 may determine that the stopped vehicle 100-1 is a vehicle to be overtaken, for example, by performing a process similar to that in step S53. In step S73, when the display unit 180 determines that the door state information includes open information, it displays a warning about the stopped vehicle 100-1. Alternatively, in step S33, when the determination unit determines that the door state information includes open information, it performs a warning determination.

[0101] In the second embodiment, the wireless communication unit 220 also repeatedly broadcasts the door state information and vehicle information in the second cycle until it receives information other than open information from the door state acquisition unit 210 (steps S74 to S76).

[0102] As described above, in the second embodiment, the wireless communication unit 220 of the wireless roadside device 200 broadcasts door state information regarding the open / closed state of the door of the stopped vehicle 100-1, and the overtaking vehicle 100-2 receives the door state information.

[0103] As a result, for example, the traffic communication system 10 according to the second embodiment also allows the overtaking vehicle 100-2 to grasp the open / closed state of the door of the stopped vehicle 100-1, similar to the traffic communication system 10 according to the first embodiment. Therefore, similar to the traffic communication system 10 according to the first embodiment, the traffic communication system 10 according to the second embodiment also makes it possible to reduce the risk of a collision between the overtaking vehicle 100-2 and the stopped vehicle 100-1.

[0104] In the second embodiment, similarly to the first embodiment, open sign information and open information may be processed together without being distinguished. In this case, when the door state acquisition unit 210 detects, for example, a sign that the door is about to open or detects that the door is open, it outputs door state information including open information and vehicle information. The display unit 180 of the overtaking vehicle 100-2 checks the open information and displays a warning. Alternatively, the determination unit of the overtaking vehicle 100-2 checks the open information and makes a warning determination.

[0105] [Other embodiments] In the second embodiment, an example has been described in which vehicle information, in addition to door state information, is transmitted from the wireless roadside device 200 to the overtaking vehicle 100-2. For example, vehicle information may also be transmitted in the first embodiment.

[0106] That is, the door status acquisition unit 110 of the stopped vehicle 100-1 includes a GNSS receiving unit that receives GNSS signals, and acquires position information of the vehicle by the GNSS receiving unit. The door status acquisition unit 110 outputs vehicle information including the position information of the vehicle together with the door status information. The overtaking vehicle 100-2 also includes a GNSS receiving unit, and the display unit 180 acquires the position information of the vehicle from the GNSS receiving unit. The display unit 180 can determine that the stopped vehicle 100-1 is the vehicle that is about to be overtaken by comparing the position information of the stopped vehicle 100-1 received from the stopped vehicle 100-1 with the position information of the vehicle itself (changes over time).

[0107] When the display unit 180 confirms that the stopped vehicle 100-1 is a vehicle to be overtaken, it displays a safety display or a caution display. In this case, the display unit 180 may not display a safety display or a caution display when it confirms that the stopped vehicle 100-1 is not a vehicle to be overtaken. As a result, for example, if the stopped vehicle 100-1 has already been overtaken, the safety display or caution display regarding the stopped vehicle 100-1 is not displayed, so it is possible to prevent the driver of the overtaking vehicle 100-2 from worrying.

[0108] Furthermore, a program (traffic communication program) that causes a computer to execute each process or function according to the above-described embodiments may be provided. Alternatively, a program (e.g., a traffic communication program) that causes the traffic communication system 10 to execute each process or function according to the above-described embodiments may be provided. The program may be recorded on a computer-readable medium. Using the computer-readable medium, the program can 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. Such a recording medium may be a memory included in the stopped vehicle 100-1, the overtaking vehicle 100-2, and the wireless roadside unit 200.

[0109] Although the embodiments have been described in detail above with reference to the drawings, the specific configuration is not limited to the above, and various design changes can be made without departing from the spirit of the invention. Furthermore, it is also possible to combine the embodiments, operation examples, or processes within a consistent range.

[0110] (Addendum) (Appendix 1) The first vehicle is a stopped vehicle, a second vehicle overtaking the first vehicle; A traffic communication system having a first wireless communication unit, the first wireless communication unit broadcasts door state information relating to an open / close state of a door of the first vehicle; The second vehicle receives the door status information. Transportation communication systems.

[0111] (Appendix 2) The door state information acquisition unit acquires the door state information. 1. A transport communication system as described in Appendix 1.

[0112] (Appendix 3) The second vehicle is a second wireless communication unit that receives the door state information; a display unit that displays information according to the door state information; 10. A transport communication system according to claim 1 or 2.

[0113] (Appendix 4) The display unit displays information indicating a warning when the door state information includes either information indicating a sign that a door of the first vehicle will open or information indicating that the door of the first vehicle is open. 4. A transportation communication system according to any one of claims 1 to 3.

[0114] (Appendix 5) The first wireless communication unit is provided in the first vehicle. 5. A transportation communication system according to any one of Supplementary Note 1 to Supplementary Note 4.

[0115] (Appendix 6) The door state acquisition unit is provided in the first vehicle, The door state acquisition unit includes a sensor provided on either a door handle of the first vehicle or a door of the first vehicle. A transportation communication system according to any one of Supplementary Note 1 to Supplementary Note 5.

[0116] (Appendix 7) Further comprising a wireless roadside unit, The first wireless communication unit is provided in the wireless roadside device. 7. A transportation communication system according to any one of Supplementary Note 1 to Supplementary Note 6.

[0117] (Appendix 8) Further comprising a wireless roadside unit, the door state acquisition unit is provided in the wireless roadside device, The door state acquisition unit includes either an image sensor that detects an open / closed state of a door of the first vehicle or a LiDAR (Light Detection and Ranging) sensor that detects an open / closed state of a door of the first vehicle. 8. A transportation communication system according to any one of Supplementary Note 1 to Supplementary Note 7.

[0118] (Appendix 9) the first wireless communication unit repeatedly broadcasts the door status information in a first cycle when the door status information includes information indicating that a door of the first vehicle is closed, and repeatedly broadcasts the door status information in a second cycle when the door status information includes either information indicating a sign that a door of the first vehicle will open or information indicating that a door of the first vehicle is open; The second period is shorter than the first period. 9. A transportation communication system according to any one of Supplementary Note 1 to Supplementary Note 8.

[0119] (Appendix 10) a wireless communication unit that broadcasts door status information regarding the open / closed status of the doors of the vehicle when the vehicle is stopped; vehicle.

[0120] (Appendix 11) a wireless communication unit that broadcasts door status information regarding the open / closed status of the doors of a parked vehicle; Wireless trackside machine.

[0121] (Appendix 12) Transportation and communication systems, a process of broadcasting door state information relating to the open / closed state of the door of the first vehicle, which is a stopped vehicle; and a process of receiving the door status information from a second vehicle that is passing the first vehicle. Transportation and Communications Program. [Explanation of symbols]

[0122] 10: Transportation communication system 100: Vehicle 100-1: Stopped vehicle 100-2: Overtaking vehicle 110: Door status acquisition unit 120: Wireless communication unit 150-1, 150-2: In-vehicle communication device 170: Wireless communication unit 180:Display section 200:Wireless roadside machine 210: Door status acquisition unit 220: Wireless communication unit

Claims

1. a first vehicle that is a stopped vehicle; a second vehicle that overtakes the first vehicle; a first wireless communication unit, the first wireless communication unit broadcasts door state information relating to an open / close state of a door of the first vehicle; The second vehicle receives the door status information, the first wireless communication unit, when the door status information includes information indicating that a door of the first vehicle is closed, repeatedly broadcasts the door status information in a first cycle, and when the door status information includes either information indicating a sign that a door of the first vehicle will open or information indicating that a door of the first vehicle is open, repeatedly broadcasts the door status information in a second cycle; The second period is shorter than the first period. Transportation communication systems.

2. The door state information acquisition unit acquires the door state information.

2. The transportation communication system according to claim 1.

3. The second vehicle is a second wireless communication unit that receives the door state information; a display unit that displays information according to the door state information; 2. The transportation communication system according to claim 1.

4. The display unit displays information indicating a warning when the door state information includes either information indicating a sign that a door of the first vehicle will open or information indicating that the door of the first vehicle is open.

4. The transportation communication system according to claim 3.

5. The first wireless communication unit is provided in the first vehicle.

2. The transportation communication system according to claim 1.

6. the door state acquisition unit is provided in the first vehicle, The door state acquisition unit includes a sensor provided on either a door handle of the first vehicle or a door of the first vehicle.

3. The transportation communication system according to claim 2.

7. Further comprising a wireless roadside unit, The first wireless communication unit is provided in the wireless roadside device.

2. The transportation communication system according to claim 1.

8. Further comprising a wireless roadside unit, the door state acquisition unit is provided in the wireless roadside device, The door state acquisition unit includes either an image sensor that detects an open / closed state of a door of the first vehicle or a Light Detection and Ranging (LiDAR) sensor that detects an open / closed state of a door of the first vehicle.

3. The transportation communication system according to claim 2.

9. a wireless communication unit that broadcasts door state information relating to the open / closed state of the doors of the vehicle when the vehicle is stopped; the wireless communication unit, when the door status information includes information indicating that a door of the host vehicle is closed, repeatedly broadcasts the door status information in a first cycle, and when the door status information includes either information indicating a sign that a door of the host vehicle will be opened or information indicating that a door of the host vehicle is open, repeatedly broadcasts the door status information in a second cycle; The second period is shorter than the first period. vehicle.

10. a wireless communication unit that broadcasts door state information relating to the open / closed state of the doors of a parked vehicle; the wireless communication unit, when the door status information includes information indicating that the door of the vehicle is closed, repeatedly broadcasts the door status information in a first cycle, and when the door status information includes either information indicating a sign that the door of the vehicle will be opened or information indicating that the door of the vehicle is open, repeatedly broadcasts the door status information in a second cycle; The second period is shorter than the first period. Wireless trackside machine.

11. Transportation and communication systems, a process of broadcasting door state information relating to the open / closed state of the door of a first vehicle that is a stopped vehicle; a process in which a second vehicle that overtakes the first vehicle receives the door status information; The transmitting process includes a process of repeatedly broadcasting the door status information in a first cycle when the door status information includes information indicating that the door of the first vehicle is closed, and a process of repeatedly broadcasting the door status information in a second cycle when the door status information includes either information indicating a sign that the door of the first vehicle will open or information indicating that the door of the first vehicle is open, The second period is shorter than the first period. Transportation and Communications Program.

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