JP5834868B2 - Pedestrian-to-vehicle communication system, wireless communication terminal, and inter-vehicle communication method - Google Patents

Description

  The present invention relates to an inter-pedal communication system, a wireless communication terminal, and an inter-pedal communication method.

  A system called inter-pedal communication that communicates between a terminal carried by a pedestrian and a terminal mounted on the vehicle for the purpose of reducing accidents between pedestrians and cars that show a large proportion of traffic accidents Has been proposed. In this system, when there is a risk that the pedestrian terminal and the vehicle-mounted terminal exchange position information and the vehicle and the pedestrian come into contact with each other, a warning can be given to both. The prior art relating to inter-step communication includes the following.

  In Patent Literature 1, a wireless communication device carried by a pedestrian and a wireless communication device mounted on a vehicle periodically communicate using a wireless transmission path of an existing inter-vehicle communication system to determine the risk of collision. In this case, a technique for notifying the driver and pedestrian of the fact is described. According to the technology, it is possible to notify the risk of collision to both the driver and the pedestrian of the vehicle.

  Further, in Patent Document 2, a mobile phone terminal periodically transmits position information of a vehicle or a pedestrian to a center via a mobile phone network, and the center predicts a course of the vehicle or a pedestrian to determine a collision risk. And a technique for transmitting an alarm to each mobile phone terminal is described. Since the route prediction and collision risk determination are performed on the center side, there is an advantage that no other special device is required if there is a mobile phone terminal capable of transmitting position information.

JP 2004-220143 A JP 2002-304700 A

  As in the inter-vehicle communication system, when the mobiles try to ensure safety by communicating with each other, there is a problem that the amount of wireless communication increases as the number of mobiles using the system increases.

  According to the invention of Patent Document 1, since a wireless communication device carried by a pedestrian is added to the inter-vehicle communication scheme, there is a problem that the communication amount increases by the number of pedestrians. In general, in the inter-vehicle communication, a wireless system is designed in consideration of the assumed number and density of vehicles. However, if a pedestrian with a large number and high density of vehicles in the same frequency band transmits data, there is a concern that the communication capacity of the entire designed system may be exceeded. If the communication capacity is exceeded, a terminal that cannot transmit information at a certain period appears, and thus the safety that is the object of the invention cannot be ensured.

  Further, the invention described in Patent Document 2 has a problem that the amount of communication of the mobile phone network increases because the location information is transmitted using the mobile phone terminal. That is, since a vehicle or a pedestrian must always transmit position information to the center, there is a possibility that a load is applied to a communication line used by the mobile phone network. In addition, since each terminal must always perform data communication during operation, there is a problem in that high communication costs occur.

  As described above, in the system for determining the collision risk by communicating with each other between the pedestrian and the vehicle, there is a problem that the communication amount becomes excessive compared with the transmission path capacity that can be used. .

  The present invention has been made in consideration of the above-described problems, and an object thereof is to provide an inter-pedal communication system that suppresses wireless communication traffic.

  In order to achieve the above object, in the inter-vehicle communication system according to the present invention, communication is performed between the pedestrian terminal and the in-vehicle terminal by the following means.

  The inter-pedestrian communication system according to the present invention is an inter-pedal communication system including a portable wireless terminal carried by a pedestrian and an in-vehicle wireless terminal mounted on the vehicle.

  Further, in the inter-vehicle communication system according to the present invention, the portable wireless terminal includes first position information acquisition means for acquiring first position information that is current position information of the portable wireless terminal, and the first position. Based on the information, the position determination means for determining whether the pedestrian is in a place where the pedestrian may come into contact with the vehicle, and the position determination means determined that the pedestrian is in a place where the pedestrian may come into contact with the vehicle. In this case, the apparatus has a position information transmitting unit that transmits the first position information to the in-vehicle wireless terminal.

  That is, the portable wireless terminal carried by the pedestrian determines whether the pedestrian is in a place where the pedestrian may come into contact with the vehicle, and sends the position information to the in-vehicle wireless terminal only when the pedestrian is in a place where the pedestrian may come into contact. Send. The place where there is a possibility of contact may be, for example, “on the roadway” or “on the pedestrian crossing”. Any information may be used as long as it can be determined based on the position information of the portable wireless terminal. By configuring in this way, the mobile wireless terminal does not need to always transmit position information, and the amount of communication from the mobile wireless terminal to the in-vehicle wireless terminal can be suppressed.

  Further, in the inter-vehicle communication system according to the present invention, the in-vehicle wireless terminal includes pedestrian information acquisition means for acquiring the first position information from the portable wireless terminal, and current position information of the in-vehicle wireless terminal. First position information acquisition means for acquiring second position information, the first position information, and the first position information, and a first position determining whether there is a risk that the vehicle contacts a pedestrian. Contact risk determination means and first warning means for warning the driver of the vehicle when the first contact risk determination means determines that there is a risk of contact with a pedestrian. .

  The in-vehicle wireless terminal acquires pedestrian position information transmitted from the mobile wireless terminal. Thereby, it is possible to know the presence or absence of a pedestrian who is present in the vicinity of the vehicle and is in a place where there is a possibility of contact with the vehicle. Only when pedestrian location information is acquired, the risk of contact with the vehicle only needs to be determined, and the positional relationship with the pedestrian does not have to be constantly checked, reducing the amount of computation on the in-vehicle wireless terminal can do.

  The communication between the position information transmission unit of the portable wireless terminal and the pedestrian information acquisition unit of the in-vehicle wireless terminal may be communication via a base station.

  Information can be transmitted using an existing wireless communication infrastructure such as a mobile phone network or a wireless data communication network, instead of directly communicating between the mobile wireless terminal and the in-vehicle wireless terminal.

The position information transmitting unit may transmit the first position information to the in-vehicle wireless terminal in the vicinity of the portable wireless terminal.

  When using an existing wireless communication infrastructure, the first location information is transmitted only to the in-vehicle wireless terminal located in the vicinity of the mobile wireless terminal, thereby reducing the amount of communication in the existing infrastructure such as a backbone line between base stations. Can be suppressed. The first location information may be transmitted to all in-vehicle wireless terminals accommodated in the same base station as the mobile wireless terminal, or it is determined that the location information is in the vicinity of the mobile wireless terminal from the respective location information. You may transmit only to the mounted in-vehicle wireless terminal.

  The in-vehicle wireless terminal has vehicle-to-vehicle communication means for exchanging vehicle traveling information including information on the position and speed of the own vehicle with another vehicle, and the portable wireless terminal has the vehicle-to-vehicle communication means The vehicle-to-vehicle communication receiving means for receiving the transmitted vehicle travel information, the position information included in the vehicle travel information received by the vehicle-to-vehicle communication receiving means, and the first position information are used to contact the pedestrian with the vehicle. When the second contact risk determination means that determines whether there is a risk of contact and the second contact risk determination means determine that there is a risk of contact with the vehicle, a warning is given to the pedestrian And a second warning means.

  That is, the portable wireless terminal intercepts the communication content of the inter-vehicle communication, compares the position information of the vehicle traveling around with its own position information, and determines whether there is a risk of contact between the vehicle and the pedestrian. The above warning is given. Since a terminal carried by a pedestrian performs only reception with respect to vehicle-to-vehicle communication and does not perform wireless transmission, there is an advantage that a transmission path for vehicle-to-vehicle communication is not affected.

  The portable wireless terminal further includes a caution area storage unit that stores caution area information that is information on an area where a pedestrian may come into contact with the vehicle, and the position determination unit includes the first position. When the position indicated by the information is within the area defined by the attention area information, it may be determined that the pedestrian is in a place where there is a possibility of contact with the vehicle.

  For example, by storing in the caution area information the boundaries between sidewalks and roadways, the position of traffic lights and pedestrian crossings, road sections with poor visibility, etc. Can be done.

  The first position information includes information about a pedestrian's traveling direction, the caution area information includes information about a pedestrian's traveling direction, and the position determination means includes the acquired pedestrian's progress. When the direction is the traveling direction defined in the attention area information, it may be determined that the pedestrian is in a place where there is a possibility of contact with the vehicle.

  The first position information includes not only pedestrian position information but also data related to the traveling direction, and the position determination means determines the possibility of contact with the vehicle using the traveling direction in addition to the pedestrian position information. . With this configuration, it is possible to more accurately determine the possibility of contact by the movement of the pedestrian, for example, when the pedestrian crosses the road.

  ADVANTAGE OF THE INVENTION According to this invention, the communication system between pedestrian vehicles which suppressed the communication volume by radio | wireless can be provided.

1 is a first schematic diagram of an inter-pedestrian communication system according to a first embodiment. It is a 2nd schematic diagram of the communication system between steps based on 1st embodiment. 1 is a system configuration diagram of a portable wireless terminal according to a first embodiment. It is a process flowchart of the portable radio | wireless terminal which concerns on 1st embodiment. It is an example of a definition of attention area information concerning a first embodiment. 1 is a system configuration diagram of an in-vehicle wireless terminal according to a first embodiment. It is a process flowchart of the vehicle-mounted radio | wireless terminal which concerns on 1st embodiment. It is a definition example of attention area information concerning a second embodiment.

(First embodiment)
<System overview>
An overview of the inter-pedal communication system according to the first embodiment will be described with reference to FIGS. 1 and 2 which are schematic diagrams. The inter-pedestrian communication system according to the first embodiment includes mobile terminals 31 and 32 that are terminals carried by pedestrians and in-vehicle terminals mounted on the vehicles 51 and 52. In the description of the embodiment, two terminals are illustrated, but any number of terminals may be used as long as one or more terminals are provided.

  The mobile terminals 31 and 32 have a function of acquiring the current position, and when the current position is a place where the pedestrian and the vehicle may come into contact with each other, the position information is transmitted to the in-vehicle terminal through the mobile phone network. Notification is made (FIG. 1). The dotted line in FIG. 1 represents transmission of pedestrian location information. A place where there is a possibility of contact with a vehicle is a place where a pedestrian can pass and a vehicle may pass through. "Bad curve section" or "On pedestrian crossing". The determination of the place where there is a possibility of contact with the vehicle can be made by referring to the acquired position information and information stored in the mobile terminal. Hereinafter, in the description of the embodiments, a place where there is a possibility of contact with the vehicle is referred to as a caution area, and information in which a caution area is defined stored in the mobile terminal is referred to as caution area information.

  In the present embodiment, the transmission of position information will be described by exemplifying a center 41 using a mobile phone network. When the center 41 receives the position information of the pedestrian from the mobile terminal through the mobile phone network, the center 41 notifies the vehicle-mounted terminals mounted on the vehicles 51 and 52 through the mobile phone network. At this time, the center 41 notifies the location information only to the in-vehicle terminal located in the vicinity of the mobile terminal based on the transmitted location information. In the example of FIG. 1, the position information transmitted from the mobile terminal 32 on the roadway is notified to the in-vehicle terminals mounted on the vehicles 51 and 52 via the center 41. Thereby, the vehicle-mounted terminal can know that there is a pedestrian in the vicinity.

  In addition, the mobile terminals 31 and 32 have a function of receiving an inter-vehicle communication data in which vehicle-mounted terminals transmit and receive information to each other, determine a danger, and issue an alarm. In vehicle-to-vehicle communication, wireless communication terminals mounted on a vehicle transmit data such as position information, speed, and direction of travel at regular intervals, so the mobile terminal receives and analyzes the data, It can be determined whether or not the vehicle is moving toward the pedestrian (FIG. 2). The broken line in FIG. 2 represents the data flow of inter-vehicle communication. For example, when the vehicle 51 deviates from the original course and travels toward the pedestrian 31, the terminal carried by the pedestrian 31 receives the inter-vehicle communication data transmitted from the vehicle 51, Judge the risk of contact and give warning by sound and vibration. Thereby, the pedestrian can know beforehand the danger of contacting with a vehicle.

<System configuration of mobile terminal>
The system configuration will be described in more detail with reference to FIGS. 3 and 4 which are system configuration diagrams of the portable terminal and the in-vehicle terminal.
FIG. 3 is a diagram illustrating a system configuration of a mobile terminal carried by a pedestrian. The mobile terminal 10 includes a position information acquisition unit 11, a sensor unit 12, a control unit 13, a cellular communication unit 14, a vehicle-to-vehicle communication reception unit 15, and an alarm notification unit 16. 13a.

  The position information acquisition unit 11 is means for acquiring position information (latitude / longitude) from the GPS module and determining its own position, and is the first position information acquisition means in the present invention. The sensor unit 12 is a sensor group for correcting position information acquired by the position information acquisition unit. The sensor unit 12 includes, for example, a gyro sensor, an acceleration sensor, a geomagnetic sensor, and the like. Any sensor may be used as long as it can correct the position information acquired by the position information acquisition unit 11. The sensor unit 12 is not an essential component for carrying out the invention.

  The control unit 13 is a means for determining whether or not the pedestrian is in a place where there is a high possibility of contact with the vehicle from the acquired position information and determining whether or not to notify the vehicle side of the position information through the mobile phone network. . It also has a function of receiving an inter-vehicle communication message, determining a risk of contact between the vehicle and a pedestrian, and determining whether to issue a warning when it is determined that the risk is high. The detailed operation of the control unit 13 will be described later.

  The cellular communication unit 14 is means for communicating with the mobile phone network, and has a function of transmitting the location information acquired by the location information acquisition unit 11 to the in-vehicle terminal. For communication, it is assumed that a packet communication network is used, and a third generation HSPA method, an EVDO method, a 3.9th generation LTE method, and the like can be used.

  The inter-vehicle communication receiving unit 15 is means for receiving data used in inter-vehicle communication. Vehicle-to-vehicle communication, which shares information between vehicles, is expected to use broadcast communication, in which all vehicles use the same frequency channel and convey information they own to surrounding vehicles all at once. Yes. Therefore, by receiving the frequency used in the inter-vehicle communication, it is possible to acquire information broadcast from surrounding vehicles, that is, data including the current position, speed, traveling direction, and the like of each vehicle.

  The alarm notification unit 16 is a means for warning the pedestrian when the control unit 13 determines that there is a risk of contact between the vehicle and the pedestrian, and is a second warning means in the present invention. The warning may be performed, for example, by generating an alarm sound or by vibrating the vibrator. Any device may be used as long as it can notify the pedestrian of the danger.

<Details of mobile terminal processing>
Next, the operation of the control unit 13 will be described with reference to FIG. 4 which is an operation flowchart of the mobile terminal 10. When the mobile terminal starts operation, the control unit 13 acquires the current position of the terminal from the position information acquisition unit 11 (S11). The position information is measured by a GPS module (not shown) and is corrected by a sensor.

  Subsequently, the control unit 13 receives inter-vehicle communication data through the inter-vehicle communication receiving unit 15 (S12). The vehicle-to-vehicle communication receiving unit 15 can receive all data transmitted from the in-vehicle terminal mounted on the vehicle traveling within the communication range, so that the current position, speed, The traveling direction can be acquired. The control part 13 which performs the process of step S12 corresponds to the vehicle-to-vehicle communication receiving means in this invention.

When the inter-vehicle communication receiving unit 15 receives the data, the control unit 13 analyzes the contents and determines whether there is a risk that the vehicle and the pedestrian come into contact (S13). The determination performed in step S13 can be performed by existing technology using position information, traveling direction, speed, and the like of pedestrians and vehicles. For example, when it can be determined from the position information and speed of the pedestrian and the vehicle that both positions overlap within a certain time, it may be determined that there is a contact risk. Even when a certain distance is secured, it may be determined that there is a contact risk if it can be determined that the driver of the vehicle is not aware of the pedestrian in consideration of the speed of the vehicle. The control part 13 which performs the process of step S13 corresponds to the 2nd contact risk determination means in this invention.

  When it is determined that there is a risk of contact, the control unit 13 notifies the alarm notification unit 16 and performs a warning activation operation, that is, a warning to the pedestrian (S15). As described above, the warning can be performed by an alarm sound or vibration. By using both together, it is possible to effectively inform the pedestrian of the danger.

  Next, the control unit 13 determines whether or not the pedestrian is in the attention area (S14). This determination can be performed by the control unit 13 referring to information defined in the attention area information data 13a. Detailed judgment by adding information such as the presence or absence of separation zones that distinguish roadways and sidewalks, traffic lights and pedestrian crossings, whether or not there are temporary stops, and poor visibility sections to the attention area information data 13a Is possible.

For example, the following range can be set as the attention area in the attention area information data.
・ Roadway on a road where the roadway and the sidewalk are separated ・ Near the intersection of the road at the intersection ・ Near the intersection of the road at the intersection where there is no temporary stop indication on the intersection The control unit 13 that performs the processing of the section step S14 is a position determination unit in the present invention, and the attention area information data 13a is a attention area storage unit in the present invention.

  Step S14 will be described in more detail. FIG. 5 is a definition example of the attention area. The part surrounded by the broken line corresponds to the attention area. For example, the caution area 61 indicates a place where a road intersection and a pedestrian crossing are located in the intersection. The caution area 62 indicates a portion where the turning angle is poor, and the caution area 63 is a caution area for all roadway portions other than the sidewalk. When the information of FIG. 5 is used, when the pedestrian is located in the caution area 61, 62, 63, it is determined that there is a possibility of contact with the vehicle.

  Note that the attention area information may be the information obtained by adding the definition of the attention area to the existing map information, or may have no map information and hold only the position coordinates of the attention area as absolute values. Good. Any data format may be used as long as a place where a pedestrian and a vehicle may come into contact can be defined.

  Return to the description of the flowchart. When it is determined in step S <b> 14 that the pedestrian is in the attention area, the process proceeds to step S <b> 16, and the pedestrian location information acquired by the location information acquisition unit 11 is transmitted to the center 41 through the cellular communication unit 14. If not, the process returns to the initial state. The control unit 13 that performs the process of step S16 corresponds to the position information transmission unit in the present invention.

<Center processing details>
Subsequently, the operation of the center 41 will be described. The center 41 has a function of receiving position information from the mobile terminal 10 through the mobile phone network and notifying the in-vehicle terminal mounted on the vehicle of the position information. The center 41 only transfers position information. From the viewpoint of saving network resources, the center 41 obtains position information transmitted from the mobile terminal 10 and is only for in-vehicle terminals located near the position (for example, a radius of 100 m). Notification is preferably performed. Moreover, you may notify with respect to all the vehicle-mounted terminals accommodated in the same base station as the portable terminal 10. FIG.

  In the description of the present embodiment, an example in which the position information is relayed using the center 41 is shown. However, if the position information of the mobile terminal 10 can be transmitted to the in-vehicle terminal 20, the center 41 is not an essential configuration. Absent.

<System configuration of in-vehicle terminal>
Next, the operation of the in-vehicle terminal 20 will be described. FIG. 6 is a diagram showing a system configuration of an in-vehicle terminal mounted on a vehicle.

  The position information acquisition unit 21 is means for acquiring position information (latitude / longitude) from a GPS module (not shown) mounted on the vehicle, and is second position information acquisition means in the present invention.

  The control unit 22 has two functions. One is to generate traffic information (position information, speed, traveling direction, etc.) to be transmitted by inter-vehicle communication from the position information acquired by the position information acquisition unit 21 and information acquired from a sensor group (not shown). This is a function of transmitting through the inter-vehicle communication unit 24. This is realized by the existing vehicle-to-vehicle communication technology. The other is that the location information transmitted by the mobile terminal 10 is received through the cellular communication unit 23, and it is determined whether there is a risk that the vehicle will come into contact with a pedestrian, and then the driver is warned through the alarm notification unit 25. It is a function to perform. Detailed operation of the control unit 22 will be described later.

  The cellular communication unit 23 is a means for communicating with the mobile phone network, and has a function of receiving position information transmitted from the mobile terminal 10 from the center 41. The reception of the position information is actively performed by push notification or the like.

  The inter-vehicle communication unit 24 is a means for transmitting and receiving data used in inter-vehicle communication. In addition to receiving traffic information transmitted from other vehicles, it also transmits traffic information generated by the host vehicle.

  The warning notification unit 25 is a means for warning the driver when the control unit 22 determines that there is a risk that the vehicle and the pedestrian come into contact with each other. The warning may be performed, for example, by generating an alarm sound, may be displayed on a vehicle-mounted display, a pedestrian icon may be displayed on the map screen of the navigation device, or the seat belt Retraction may be performed, or may be performed by momentarily operating the brake. The warning methods exemplified above can be used in combination of a plurality of methods.

<In-vehicle terminal processing details>
Next, the operation of the control unit 22 will be described with reference to FIG. When the in-vehicle terminal starts operation, the control unit 22 acquires the current position of the in-vehicle terminal from the position information acquisition unit 21 (S21).

  Then, the control part 22 confirms whether the positional information on a pedestrian is received through the cellular communication part 23 (S22). The control part 22 which performs the process of step S22 is a pedestrian information acquisition means in this invention. When there is no pedestrian position information, the operation returns to the initial state, and the process is repeated from step S21.

  When the position information of the pedestrian is received, it means that there is a pedestrian at a nearby point that may come into contact with the vehicle, so the position information acquisition unit 21 matches the current position of the vehicle acquired, The risk of contact is determined (S23). For determining the contact risk, mutual position information, traveling direction, speed, and the like can be used. Similar to the determination performed by the mobile terminal 10 (S13), the existing technology can be used. The control part 22 which performs the process of step S23 is the 1st contact risk determination means in this invention.

  When it is determined that there is a risk of contact, the control unit 22 notifies the alarm notification unit 25, and performs a warning start operation, that is, a warning to the driver (S24). As described above, the warning can be performed by sound or the like. The alarm notification unit 25 is the first warning means in the present invention.

  According to the present invention, a wireless communication device carried by a pedestrian and a wireless communication device mounted on a vehicle acquire each other's positional information and determine the risk of contact with the pedestrian and driver. An inter-vehicle communication system that can issue a warning can be realized. For pedestrians to vehicles, by transmitting location information only when the pedestrian is in a place where there is a possibility of contact with the vehicle, the traffic of the cellular phone network can be suppressed, and On the other hand, the consumption of radio resources for inter-vehicle communication can be prevented by receiving the inter-vehicle communication information. As a result, it is possible to realize an inter-pedestrian communication system that suppresses the wireless communication amount, which is an object of the invention.

(Second embodiment)
In the first embodiment, it is determined that there is a possibility of contact with the vehicle when the pedestrian is located in the caution area, but the second embodiment is further determined in consideration of the traveling direction of the pedestrian. It is the form which performs. The system configuration diagram and the process flowchart in the second embodiment are the same as those in the first embodiment except for the process in step S14.

  FIG. 8 which is the attention area information in the second embodiment is an example in the case of determining the possibility of contact in consideration of the traveling direction of the pedestrian in addition to the first embodiment. Black circles in FIG. 8 are pedestrians. For example, in the caution areas 63 and 64, it is determined that there is a possibility of contact with the vehicle only when the pedestrian is in the area and is moving in the illustrated direction. This is because the vehicle traveling from behind cannot be seen and the danger cannot be excluded. In the attention area 65, it is determined that there is a possibility of contact with the vehicle only when the pedestrian crosses the road. In the second embodiment, the criterion in step S14 is “when the pedestrian is in the caution area and is moving in the defined direction”. By doing in this way, even if it is in a caution area, the case where possibility that a vehicle and a pedestrian will contact is low can be excluded.

  Further, in addition to the traveling direction, determination may be performed by combining behavior prediction using a rate of change in the traveling direction, a walking speed, or the like. For example, if a pedestrian is stopped near a pedestrian crossing, it is determined that it is looking for an opportunity to cross the road, and it is determined that there is a possibility of contact with the vehicle even if it is not traveling in a specific direction. You may do it. Moreover, when the speed and the traveling direction are unstable, the determination of the possibility of contact may be made strict.

(Modification)
The above description is merely an example for explaining the present invention, and each embodiment can be modified without departing from the gist of the present invention. For example, even if the portable terminal 10 does not have a function (S12, 13) for receiving communication contents of inter-vehicle communication and a function (S15) for issuing a warning, the communication amount of the inter-vehicle communication system is suppressed. Aim can be achieved.

In the description of the embodiment, the location information of the mobile terminal 10 is transmitted using the mobile phone network and the center 41, but other wireless communication infrastructure such as WiMAX (Worldwide Interoperability for Microwave Access) is used. May be. The communication method is not limited as long as the position information of the portable terminal can be transmitted to the in-vehicle terminal by a communication method different from the inter-vehicle communication. Similarly, a method in which a mobile terminal and an in-vehicle terminal directly communicate without using a base station may be used.

  Moreover, if the portable terminal 10 can determine the possibility of contact with the vehicle, the caution area information data may not be used. For example, when it can be determined that the pedestrian is jealous based on information from the position information acquisition unit 11 and the sensor unit 12, it may be determined that there is a possibility of contact with the vehicle.

  Moreover, the portable terminal 10 may stop transmission of position information, when the message of vehicle-to-vehicle communication is not received. When there is no vehicle equipped with an in-vehicle terminal around, it is possible to reduce the load on the mobile phone network by stopping the transmission of position information.

DESCRIPTION OF SYMBOLS 10 Mobile terminal 11, 21 Position information acquisition part 12 Sensor part 13,22 Control part 13a Caution area information data 14,23 Cellular communication part 15 Inter-vehicle communication receiving part 16, 25 Alarm notification part 20 In-vehicle terminal 24 Inter-vehicle communication part

Claims (7)

A communication system between pedestrians composed of a portable wireless terminal carried by a pedestrian and an in-vehicle wireless terminal mounted on a vehicle,
The portable wireless terminal is
Caution area information storage means for storing caution area information, which is data representing information on an area where a pedestrian may come into contact with the vehicle, together with the direction of travel of the pedestrian in the area,
First position information acquisition means for acquiring first position information which is current position information of the portable wireless terminal and a traveling direction of a pedestrian carrying the portable wireless terminal ;
Position determination means for comparing the first position information and the traveling direction of the pedestrian with the attention area information and determining whether or not the pedestrian may come into contact with the vehicle;
When there is a possibility that a pedestrian is in contact with the vehicle , the first position information is transmitted to the in-vehicle wireless terminal, position information transmitting means,
Have
The in-vehicle wireless terminal is
Pedestrian information acquisition means for acquiring the first position information from the portable wireless terminal;
Second position information acquisition means for acquiring second position information which is current position information of the in-vehicle wireless terminal;
From the first position information and the second position information, a first contact risk determination means for determining whether there is a risk that the vehicle contacts a pedestrian,
When the first contact risk determination means determines that there is a risk of contact with a pedestrian, first warning means for warning the driver of the vehicle;
A communication system between pedestrians. The inter-pedestrian communication system according to claim 1, wherein the communication between the position information transmission unit of the portable radio terminal and the pedestrian information acquisition unit of the in-vehicle radio terminal is communication via a base station. The inter-pedal communication system according to claim 2, wherein the position information transmitting unit transmits the first position information to the in-vehicle wireless terminal in the vicinity of the portable wireless terminal. The in-vehicle wireless terminal is
Inter-vehicle communication means for exchanging vehicle travel information including information on the position and speed of the own vehicle with other vehicles,
The portable wireless terminal is
Vehicle-to-vehicle communication receiving means for receiving vehicle travel information transmitted by the vehicle-to-vehicle communication means;
The second contact risk for determining whether there is a risk that the pedestrian contacts the vehicle using the position information included in the vehicle travel information received by the inter-vehicle communication receiving means and the first position information. A determination means;
When the second contact risk determination means determines that there is a risk of contact with the vehicle, second warning means for warning the pedestrian,
The inter-pedestrian communication system according to any one of claims 1 to 3, further comprising: A portable wireless terminal that is carried by a pedestrian and that transmits its position information to the in-vehicle wireless terminal,
Caution area information storage means for storing caution area information, which is data representing information about an area where a pedestrian may come into contact with the vehicle, together with the direction of travel of the pedestrian in the area,
First position information acquisition means for acquiring first position information which is current position information of the portable wireless terminal and a traveling direction of a pedestrian carrying the portable wireless terminal ;
Position determination means for comparing the first position information and the traveling direction of the pedestrian with the attention area information and determining whether or not the pedestrian may come into contact with the vehicle;
When there is a possibility that a pedestrian is in contact with the vehicle, position information transmitting means for transmitting the first position information to the in-vehicle wireless terminal;
A portable wireless terminal characterized by comprising: Vehicle-to-vehicle communication receiving means for receiving vehicle travel information including information on the position and speed of the vehicle transmitted by the in-vehicle wireless terminal;
The second contact risk for determining whether there is a risk that the pedestrian contacts the vehicle using the position information included in the vehicle travel information received by the inter-vehicle communication receiving means and the first position information. A determination means;
When the second contact risk determination means determines that there is a risk of contact with the vehicle, second warning means for warning the pedestrian,
The mobile wireless terminal according to claim 5 , further comprising: A step-to-step communication method performed by a step-to-step communication system composed of a portable wireless terminal carried by a pedestrian and an in-vehicle wireless terminal mounted on a vehicle,
The portable wireless terminal is
Storing attention area information, which is data representing information about an area where a pedestrian may come into contact with the vehicle, along with the direction of travel of the pedestrian in the area,
Obtaining first position information which is current position information of the portable wireless terminal and a traveling direction of a pedestrian carrying the portable wireless terminal ;
Comparing the first position information and the direction of travel of the pedestrian with the attention area information to determine whether or not the pedestrian may contact the vehicle;
When there is a possibility that a pedestrian is in contact with the vehicle , the first position information is transmitted to the in-vehicle wireless terminal,
The in-vehicle wireless terminal is
Obtaining the first location information from the portable wireless terminal;
Obtaining second position information which is current position information of the in-vehicle wireless terminal;
From the first position information and the second position information, determine whether there is a risk that the vehicle contacts a pedestrian,
An inter-pedestrian communication method characterized by warning a vehicle driver when it is determined that there is a risk of contact with a pedestrian.

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