JP6590250B2 - In-vehicle terminal device, pedestrian terminal device, inter-pedal communication system, and inter-pedal communication method - Google Patents

Description

  The present invention relates to an in-vehicle terminal device that is mounted on a vehicle and performs inter-pedal communication with a pedestrian terminal device, and a pedestrian terminal device that is possessed by a pedestrian and performs inter-pedal communication with the in-vehicle terminal device. The present invention relates to an inter-pedestrian communication system and an inter-pedal communication method for performing inter-pedal communication between an in-vehicle terminal device and a pedestrian terminal device.

  In recent years, studies for practical application and spread of a safe driving assistance wireless system using ITS (Intelligent Transport System) have been underway. In this safe driving support wireless system, by vehicle-to-vehicle communication that communicates between in-vehicle terminal devices mounted on the vehicle, or road-to-vehicle communication that communicates between a roadside device installed on the road and the in-vehicle terminal device, Vehicle position information is communicated to alert the vehicle driver to avoid accidents.

  In recent years, in order to prevent a pedestrian accident, inter-pedal communication has been proposed in which communication is performed between a pedestrian terminal device carried by a pedestrian and an in-vehicle terminal device. In this pedestrian-to-vehicle communication, the pedestrian terminal device and the vehicle-mounted terminal device can communicate with each other directly, so that both pedestrians and vehicle drivers can be alerted at appropriate timing. A great effect is expected to prevent accidents.

  In such inter-pedestrian communication, especially in a situation where there are a large number of pedestrians, such as in a downtown area, an increase in the number of pedestrian terminal devices may increase inter-pedal communication traffic and cause congestion in inter-pedal communication. Therefore, it is necessary to avoid the congestion of inter-pedestrian communication as much as possible. Therefore, it is desirable to reduce the traffic of inter-pedal communication.

  Conventionally, as a technique for reducing traffic between pedestrian communication, one pedestrian terminal device among a plurality of pedestrian terminal devices has become a representative terminal, and walking via the pedestrian terminal device that has become the representative terminal. A technique for exchanging information between a person terminal device and an in-vehicle terminal device is known (see Patent Documents 1 and 2).

Japanese Patent No. 48766628 Japanese Patent No. 4862669

  Now, the communication between pedestrians between the pedestrian terminal device and the in-vehicle terminal device is such that the transmission output is relatively large so that both the pedestrian and the driver of the vehicle can perform the risk avoidance action with a sufficient margin. It is necessary to set a large value so that stable communication can be performed even at a position where the pedestrian terminal device and the in-vehicle terminal device are sufficiently separated.

  On the other hand, in the pedestrian terminal device, the capacity of the battery is limited in order to reduce the weight because the pedestrian carries it. For this reason, in order to enable long-term use, it is desired to save power by reducing power consumption.

  However, in the conventional technique, after the representative terminal is selected, the inter-step communication similar to that in the normal time when the representative terminal is not selected is continued. For this reason, there is a problem that power saving of the pedestrian terminal device cannot be sufficiently achieved, and communication traffic between the pedestrian terminal device and the in-vehicle terminal device cannot be sufficiently reduced. .

  The present invention has been devised to solve such problems of the prior art, and its main purpose is to reduce the power consumption of the pedestrian terminal device, as well as the pedestrian terminal device and the in-vehicle terminal device. It is to provide an in-vehicle terminal device, a pedestrian terminal device, an inter-pedal communication system, and an inter-pedal communication method that are configured to reduce communication congestion by reducing communication traffic between the vehicle and the vehicle. .

  An in-vehicle terminal device of the present invention is an in-vehicle terminal device that is mounted on a vehicle and performs inter-pedestrian communication with a pedestrian terminal device, and includes an inter-pedal communication unit that performs the inter-pedal communication, and low power communication. A low-power communication unit that performs the communication control unit that switches between the two operation modes of the normal mode and the representative terminal mode, and in the normal mode, the pedestrian information by the inter-pedestrian communication with the pedestrian terminal device Vehicle information is mutually exchanged, and in the representative terminal mode, as a representative terminal of the pedestrian terminal device existing around the own device, pedestrian information is acquired from the pedestrian terminal device by the low-power communication. The pedestrian information is provided to another in-vehicle terminal device, and the vehicle information acquired from the other in-vehicle terminal device is provided to the pedestrian terminal device by the low-power communication.

  Further, the pedestrian terminal device of the present invention is a pedestrian terminal device that a pedestrian possesses and performs inter-pedestrian communication with an in-vehicle terminal device, and the inter-pedestrian communication unit that performs the inter-pedal communication, A low-power communication unit that performs low-power communication, and a communication control unit that switches between two operation modes of a normal mode and an in-group terminal mode, and in the normal mode, the inter-step communication with the in-vehicle terminal device The pedestrian information and the vehicle information are exchanged with each other, and in the intra-group terminal mode, pedestrian information is provided by the low-power communication to the in-vehicle terminal device that has become a representative terminal existing around the own device, and The vehicle information acquired from the other in-vehicle terminal device in the in-vehicle terminal device serving as the representative terminal is acquired from the in-vehicle terminal device serving as the representative terminal by the low power communication.

  The inter-pedestrian communication system of the present invention includes an in-vehicle terminal device mounted on a vehicle and a pedestrian terminal device possessed by a pedestrian, and walks between the in-vehicle terminal device and the pedestrian terminal device. An inter-vehicle communication system that performs inter-vehicle communication, wherein the in-vehicle terminal device includes an inter-vehicle communication unit that performs inter-vehicle communication, a low-power communication unit that performs low-power communication, and a normal mode and a representative terminal mode. A communication control unit that switches an operation mode, and the pedestrian terminal device includes: an inter-pedestrian communication unit that performs inter-pedal communication; a low-power communication unit that performs low-power communication; and a normal mode and an intra-group terminal mode. A communication control unit that switches between two operation modes, and when the in-vehicle terminal device and the pedestrian terminal device are in a normal mode, inter-walk communication is performed between the in-vehicle terminal device and the pedestrian terminal device. When the pedestrian information and the vehicle information are mutually exchanged, and the in-vehicle terminal device shifts to the representative terminal mode, and the pedestrian terminal device existing around the in-vehicle terminal device shifts to the in-group terminal mode, the in-vehicle As a representative terminal of the pedestrian terminal device in a group, the terminal device acquires pedestrian information from the pedestrian terminal device by the low-power communication, and provides the pedestrian information to other in-vehicle terminal devices, Moreover, it is set as the structure which provides the said pedestrian terminal device with the vehicle information acquired from the other vehicle-mounted terminal device by the said low electric power communication.

  Further, the inter-pedestrian communication method of the present invention is an inter-pedal communication method for performing inter-pedal communication between an in-vehicle terminal device mounted on a vehicle and a pedestrian terminal device possessed by a pedestrian, wherein the in-vehicle terminal When the device and the pedestrian terminal device are in the normal mode, pedestrian information and vehicle information are exchanged between the in-vehicle terminal device and the pedestrian terminal device by inter-walk communication, and the in-vehicle terminal device is a representative. When shifting to the terminal mode and the pedestrian terminal device existing around the in-vehicle terminal device shifts to the intra-group terminal mode, the in-vehicle terminal device is small as a representative terminal of the pedestrian terminal device in the group. The pedestrian information is acquired from the pedestrian terminal device by power communication, the pedestrian information is provided to another in-vehicle terminal device, and the vehicle information acquired from the other in-vehicle terminal device is converted into the small power Receive by a structure to be provided to the pedestrian terminal device.

  According to the present invention, since information is exchanged by low power communication between the in-vehicle terminal device and the pedestrian terminal device which is the representative terminal, the power consumption of the pedestrian terminal device is suppressed, and the pedestrian terminal device In addition, even in situations where there are a large number of pedestrian terminal devices and in-vehicle terminal devices, communication traffic between the pedestrian terminal device and the in-vehicle terminal device can be reduced to reduce communication congestion. Can be reduced.

1 is an overall configuration diagram of an inter-vehicle communication system according to a first embodiment. Explanatory drawing which shows the communication condition in an inter-vehicle communication system The block diagram which shows schematic structure of the pedestrian terminal device 1 and the vehicle-mounted terminal device 3 The sequence diagram which shows the procedure of communication in the pedestrian terminal device 1 and the vehicle-mounted terminal device 3 Flow chart showing processing procedure in in-vehicle terminal device 3 The flowchart which shows the procedure of the process in the pedestrian terminal device 1. Explanatory drawing which shows the communication condition in the communication system between steps based on 2nd Embodiment. The sequence diagram which shows the procedure of communication in the pedestrian terminal device 1 and the vehicle-mounted terminal device 3 Flow chart showing processing procedure in in-vehicle terminal device 3 Flow chart showing processing procedure in in-vehicle terminal device 3 Explanatory drawing which shows the communication condition in the communication system between pedestrians concerning 3rd Embodiment. Explanatory drawing which shows the communication condition in the communication system between pedestrians concerning 4th Embodiment. Explanatory drawing which shows the communication condition in the communication system between pedestrians concerning 5th Embodiment. Explanatory drawing which shows the communication condition in the communication system between pedestrians concerning 6th Embodiment.

  1st invention made | formed in order to solve the said subject is the vehicle-mounted terminal device which is mounted in a vehicle and performs communication between pedestrians between pedestrian terminal devices, Comprising: The communication between pedestrians which performs the said communication between pedestrians Unit, a low-power communication unit that performs low-power communication, and a communication control unit that switches between two operation modes of a normal mode and a representative terminal mode, and in the normal mode, between the pedestrian terminal device Pedestrian information and vehicle information are exchanged with each other by inter-walk communication, and in the representative terminal mode, as a representative terminal of the pedestrian terminal device existing in the vicinity of the own device, from the pedestrian terminal device by the low power communication A configuration for acquiring pedestrian information, providing the pedestrian information to other in-vehicle terminal devices, and providing vehicle information acquired from the other in-vehicle terminal devices to the pedestrian terminal device by the low-power communication; That.

  According to this, since information is exchanged between the in-vehicle terminal device that has become the representative terminal and the pedestrian terminal device by low-power communication, the power consumption of the pedestrian terminal device is suppressed, and the pedestrian terminal device is saved. Electricity can be achieved, and even in situations where there are a large number of pedestrian terminal devices and in-vehicle terminal devices, communication traffic between the pedestrian terminal device and the in-vehicle terminal device is reduced to reduce communication congestion. be able to.

  Moreover, 2nd invention sets it as the structure which the said communication control part voluntarily transfers to representative terminal mode, if the own vehicle will be in the state which satisfy | fills predetermined representative terminal transition conditions.

  According to this, a vehicle-mounted terminal device suitable as a representative terminal of a pedestrian terminal device can be quickly made a representative terminal.

  Further, in the third invention, the communication control unit is transmitted from the other in-vehicle terminal device when it is determined in the other in-vehicle terminal device that the own vehicle is in a state satisfying a predetermined representative terminal transition condition. When a representative terminal transition request is received, a transition is made to the representative terminal mode.

  According to this, a vehicle-mounted terminal device suitable as a representative terminal of a pedestrian terminal device can be quickly made a representative terminal.

  According to a fourth aspect of the present invention, the representative terminal transition condition is that a state where the traveling speed of the vehicle is equal to or lower than a predetermined speed continues for a predetermined time or longer.

  According to this, when the state where the traveling speed of the vehicle is equal to or lower than the predetermined speed continues for a predetermined time or more, that is, when the vehicle is stopped or driving slowly, the in-vehicle terminal device is changed to the pedestrian terminal device. It can function appropriately as a representative terminal.

  According to a fifth aspect of the present invention, the representative terminal transition condition is that a vehicle exists in a predetermined target area set so as to include a dangerous area.

  According to this, it is possible to reduce communication congestion in the dangerous area and reliably reduce traffic accidents in the dangerous area.

  Moreover, 6th invention is set as the structure where the said target area is the circumference | surroundings of the accident frequent occurrence zone as said danger area.

  According to this, it is possible to reduce communication congestion in the accident-prone area and reliably reduce traffic accidents in the accident-prone area.

  Moreover, 7th invention sets it as the structure where the said target area is the periphery of a level crossing as said dangerous area.

  According to this, it is possible to reduce traffic congestion in the vicinity of a level crossing and to reliably reduce a level crossing accident.

  The eighth invention is configured such that the target area is a disaster occurrence area as the dangerous area.

  According to this, it is possible to reduce communication congestion in the disaster occurrence area and reliably reduce traffic accidents in the disaster occurrence area.

  Moreover, 9th invention sets it as the structure where the said target area is the periphery of the boarding / alighting area of the passenger vehicle as said danger area.

  According to this, it is possible to reduce the traffic congestion around the boarding area of the passenger vehicle and to reduce the traffic accident around the boarding area.

  Further, a tenth aspect of the invention is configured such that the communication control unit voluntarily releases the representative terminal mode when the host vehicle enters a state that satisfies a predetermined representative terminal release condition.

  According to this, it can avoid that a vehicle-mounted terminal device continues a representative terminal uselessly.

  In an eleventh aspect of the invention, the representative terminal release condition is that the traveling speed of the vehicle exceeds a predetermined speed.

  According to this, since the pedestrian terminal device cannot function properly as the representative terminal when the traveling speed of the vehicle increases, the in-vehicle terminal device is unnecessary by releasing the representative terminal when the traveling speed of the vehicle increases. It is possible to avoid continuing the representative terminal.

  In a twelfth aspect of the invention, the representative terminal release condition is that a state in which a signal from the pedestrian terminal device is not received continues for a predetermined time or more.

  According to this, if the signal from the pedestrian terminal device is not received for a long time, there is no pedestrian terminal device around the in-vehicle terminal device. Therefore, if the signal from the pedestrian terminal device is not received for a long time, the representative terminal By canceling, it is possible to avoid the in-vehicle terminal device from continuing to use the representative terminal unnecessarily.

  In a thirteenth aspect, the representative terminal release condition is that a predetermined time has elapsed since the transition to the representative terminal mode.

  According to this, it can be avoided that one in-vehicle terminal device continues the representative terminal for a long time.

  The fourteenth invention is a pedestrian terminal device that a pedestrian possesses and performs inter-pedestrian communication with an in-vehicle terminal device, the inter-pedal communication unit that performs the inter-pedal communication, and low power communication And a communication control unit that switches between two operation modes of a normal mode and an in-group terminal mode, and in the normal mode, a pedestrian is communicated with the in-vehicle terminal device by the inter-pedestrian communication. Information and vehicle information are exchanged with each other, and in the intra-group terminal mode, pedestrian information is provided to the in-vehicle terminal device which has become a representative terminal existing around its own device by the low-power communication, and the representative The vehicle information acquired from the other in-vehicle terminal device in the in-vehicle terminal device serving as the terminal is configured to be acquired from the in-vehicle terminal device serving as the representative terminal by the low power communication.

  According to this, similarly to the first invention, it is possible to reduce power consumption of the pedestrian terminal device and reduce traffic between the pedestrians by reducing traffic between the pedestrians.

  In addition, the fifteenth aspect of the invention is configured such that the communication control unit stops the operation of the inter-pedestrian communication unit when it shifts to the intra-group terminal mode.

  According to this, since the inter-vehicle communication is stopped in the intra-group terminal mode, further power saving of the pedestrian terminal device can be achieved.

  A sixteenth aspect of the invention includes an in-vehicle terminal device mounted on a vehicle and a pedestrian terminal device possessed by a pedestrian, and performs inter-vehicle communication between the in-vehicle terminal device and the pedestrian terminal device. An inter-pedestrian communication system that performs two operation modes: an inter-pedestrian communication unit that performs inter-pedal communication, a low-power communication unit that performs low-power communication, and a normal mode and a representative terminal mode. A communication control unit for switching, and the pedestrian terminal device has two operations: a pedestrian communication unit that performs the inter-vehicle communication, a low-power communication unit that performs low-power communication, and a normal mode and an in-group terminal mode. A communication control unit that switches modes, and when the in-vehicle terminal device and the pedestrian terminal device are in a normal mode, the pedestrian information is transmitted between the in-vehicle terminal device and the pedestrian terminal device by inter-pedestrian communication. Vehicle information is mutually exchanged, and when the in-vehicle terminal device shifts to the representative terminal mode and the pedestrian terminal device existing around the in-vehicle terminal device shifts to the intra-group terminal mode, the in-vehicle terminal device As a representative terminal of the pedestrian terminal device in the group, the pedestrian information is acquired from the pedestrian terminal device by the low-power communication, and the pedestrian information is provided to other in-vehicle terminal devices. Vehicle information acquired from the vehicle-mounted terminal device is configured to be provided to the pedestrian terminal device by the low-power communication.

  According to this, similarly to the first invention, it is possible to reduce power consumption of the pedestrian terminal device and reduce traffic between the pedestrians by reducing traffic between the pedestrians.

  In addition, according to a seventeenth aspect, when the in-vehicle terminal device shifts to the representative terminal mode, the on-vehicle terminal device transmits a representative terminal notification. When the pedestrian terminal device receives the representative terminal notification, the in-group terminal mode is set. The configuration is to be migrated.

  According to this, the pedestrian terminal device existing around the in-vehicle terminal device that has become the representative terminal can be promptly shifted to the intra-group terminal mode.

  An eighteenth aspect of the present invention is an inter-pedestrian communication method for performing inter-pedal communication between an in-vehicle terminal device mounted on a vehicle and a pedestrian terminal device possessed by a pedestrian, wherein the in-vehicle terminal device and the When the pedestrian terminal device is in the normal mode, pedestrian information and vehicle information are exchanged between the in-vehicle terminal device and the pedestrian terminal device by inter-walk communication, and the in-vehicle terminal device enters the representative terminal mode. When the pedestrian terminal device existing around the in-vehicle terminal device shifts to the in-group terminal mode, the in-vehicle terminal device becomes a representative terminal of the pedestrian terminal device in the group by low power communication. The pedestrian information is acquired from the pedestrian terminal device, the pedestrian information is provided to another in-vehicle terminal device, and the vehicle information acquired from the other in-vehicle terminal device is obtained by the low power communication. A configuration to provide the serial pedestrian terminal equipment.

  According to this, similarly to the first invention, it is possible to reduce power consumption of the pedestrian terminal device and reduce traffic between the pedestrians by reducing traffic between the pedestrians.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

(First embodiment)
FIG. 1 is an overall configuration diagram of an inter-pedal communication system according to the first embodiment.

  This inter-pedestrian communication system includes a pedestrian terminal device 1 and a portable information terminal device 2 possessed by a pedestrian, and an in-vehicle terminal device 3 and a car navigation device 4 mounted on the vehicle.

  The pedestrian terminal device 1 includes a positioning function that acquires position information of the device itself and a communication function that performs inter-pedestrian communication with the in-vehicle terminal device 3. The portable information terminal device 2 is a smartphone, a mobile phone, a tablet terminal, a wearable terminal, or the like. The pedestrian terminal device 1 and the portable information terminal device are connected to each other, and the portable information terminal device 2 outputs, for example, an alert for a pedestrian for avoiding an accident based on information output from the pedestrian terminal device 1. An operation (for example, voice output or screen display) is performed.

  The in-vehicle terminal device 3 performs a positioning function for acquiring position information of the own device, a communication function for performing inter-vehicle communication with the pedestrian terminal device 1, and inter-vehicle communication with other in-vehicle terminal devices 3. And a communication function to perform. The car navigation device 4 provides route guidance to the driver. The in-vehicle terminal device 3 and the car navigation device 4 are connected to each other. In the car navigation device 4, an output operation such as alerting the driver for avoiding an accident based on information output from the in-vehicle terminal device 3 (for example, Audio output and screen display).

  Note that the in-vehicle terminal device 3 may be connected to the portable information terminal device 2 possessed by the driver and cause the portable information terminal device 2 to perform an output operation such as alerting the driver. The in-vehicle terminal device 3 also has a communication function for performing road-to-vehicle communication with a roadside device installed on the road, in addition to inter-vehicle communication and inter-vehicle communication.

  The pedestrian terminal device 1 may be built in the portable information terminal device 2, and the in-vehicle terminal device 3 may be built in the car navigation device 4. Moreover, in the pedestrian terminal device 1 and the vehicle-mounted terminal device 3, you may make it acquire the positional information on an own apparatus using the positioning function which the portable information terminal device 2 and the car navigation apparatus 4 have.

  Now, in this inter-pedestrian communication system, between pedestrian terminal device 1 and in-vehicle terminal device 3, pedestrian information such as pedestrian location information and vehicle information such as vehicle location information are normally obtained. Exchange with each other using inter-pedal communication. In addition, vehicle information such as vehicle position information is exchanged between the vehicle-mounted terminal devices 3 using inter-vehicle communication.

  On the other hand, when the vehicle in which the in-vehicle terminal device 3 is mounted is in a state where the predetermined representative terminal transition condition is satisfied, the in-vehicle terminal device 3 becomes the representative terminal of the pedestrian terminal device 1 existing around the own device. And the pedestrian terminal device 1 which exists in the predetermined range from the vehicle-mounted terminal device 3 used as a representative terminal forms the group which makes the vehicle-mounted terminal device 3 a common representative terminal.

  The pedestrian terminal device 1 and the in-vehicle terminal device 3 have a function of low-power communication, and the in-vehicle terminal device 3 that has become a representative terminal uses low-power communication instead of inter-pedal communication, The pedestrian information is acquired from the pedestrian terminal device 1, and the pedestrian information and the own vehicle information are provided to other in-vehicle terminal devices by inter-vehicle communication, and the other in-vehicle terminal devices 3 are provided by inter-vehicle communication. The vehicle information acquired from the vehicle and its own vehicle information are provided to the pedestrian terminal device 1 in the group using low-power communication. At this time, the in-vehicle terminal device 3 that has become the representative terminal may communicate with other in-vehicle terminal devices using inter-vehicle communication instead of inter-vehicle communication.

  The pedestrian information and the vehicle information include identification information (terminal ID, MAC address, etc.) of the pedestrian terminal device 1 and the in-vehicle terminal device 3 in addition to the pedestrian position information and the vehicle position information. The pedestrian information and vehicle information include pedestrians and vehicles acquired by sensors (not shown) provided in the pedestrian terminal device 1 and the in-vehicle terminal device 3 or the portable information terminal device 2 and the car navigation device 4. Information on the direction of travel and the speed of movement is also included.

  Next, a communication state in the inter-pedal communication system shown in FIG. 1 will be described. FIG. 2 is an explanatory diagram showing a communication state in the inter-vehicle communication system.

  In the in-vehicle terminal device 3, when the host vehicle enters a state where the predetermined representative terminal transition condition is satisfied, the in-vehicle terminal device spontaneously shifts to the representative terminal mode and becomes the representative terminal of the pedestrian terminal device 1 existing in the vicinity thereof. In the present embodiment, the representative terminal transition condition is that the state where the traveling speed of the vehicle is equal to or lower than the predetermined speed continues for a predetermined time or longer, that is, the vehicle is stopped or driving slowly.

  When the in-vehicle terminal device 3 shifts to the representative terminal, the representative terminal notification is transmitted to the surrounding pedestrian terminal device 1 by low power communication. This representative terminal notification notifies the surrounding pedestrian terminal device 1 that the in-vehicle terminal device 3 that has become the representative terminal exists, and the representative terminal notification includes identification information (terminal) of the in-vehicle terminal device 3. ID, MAC address, etc.) and location information.

  When the pedestrian terminal device 1 receives the representative terminal notification from the in-vehicle terminal device 3 that has become the representative terminal and satisfies the predetermined group formation condition, the pedestrian terminal device 1 shifts to the in-group terminal mode. In this embodiment, it is set as a group formation condition that the pedestrian terminal device 1 exists within a predetermined range (group formation area) based on the in-vehicle terminal device 3 that is the representative terminal, and this group formation condition is satisfied. The pedestrian terminal device 1 forms a group having the in-vehicle terminal device 3 as a common representative terminal.

  At this time, based on the reception level of the representative terminal notification signal transmitted from the in-vehicle terminal device 3 serving as the representative terminal, the distance to the in-vehicle terminal device 3 serving as the representative terminal is estimated, and the own device forms a group. What is necessary is just to determine whether it exists in an area. If the position information of the in-vehicle terminal device 3 is added to the representative terminal notification and transmitted, the distance from the position information of the pedestrian terminal device 1 and the in-vehicle terminal device 3 to the in-vehicle terminal device 3 that has become the representative terminal. Can be measured. Further, the group formation area is set so that the communication quality based on the reception level of the signal of the representative terminal notification satisfies a predetermined standard so that stable low power communication is possible.

  In this way, when the in-vehicle terminal device 3 shifts to the representative terminal mode and the pedestrian terminal device 1 shifts to the intra-group terminal mode, the pedestrian information becomes the representative terminal from the pedestrian terminal device 1 by low power communication. To the in-vehicle terminal device 3. When the pedestrian information transmitted from the pedestrian terminal device 1 is received, the in-vehicle terminal device 3 that has become the representative terminal transmits the pedestrian information and its own vehicle information to the other in-vehicle terminal device 3 through inter-vehicle communication. Send.

  In addition, in the in-vehicle terminal device 3 serving as the representative terminal, when receiving vehicle information transmitted from another in-vehicle terminal device 3 through inter-vehicle communication, the vehicle information and its own vehicle information are transmitted within the group by low-power communication. To the pedestrian terminal device 1.

  In addition, in the vehicle-mounted terminal device 3 which became the representative terminal, in addition to providing the other vehicle-mounted terminal device 3 with the pedestrian information for each pedestrian acquired from the pedestrian terminal device 1, the vehicle-mounted terminal device 3 is based on the position information for each pedestrian. Alternatively, group information representing the range of an area where a plurality of pedestrians are present may be acquired, and the group information may be provided to other in-vehicle terminal devices 3. Thereby, when many pedestrians exist in a narrow area, the amount of communication can be reduced. In this case, the group information is information for identifying the area where the pedestrian is present. For example, the position information (latitude, longitude, altitude) of the center and end points of the area and the form of the area (shape, length, width, etc.) Etc.

  By the way, in the vehicle-mounted terminal device 3, when it transfers to a representative terminal, transmission of a representative terminal notification is started, and thereafter, the representative terminal notification is periodically transmitted until the representative terminal is released. Thereby, the pedestrian terminal device 1 which newly entered the group formation area can be quickly joined to the group.

  Next, schematic configurations of the pedestrian terminal device 1 and the in-vehicle terminal device 3 illustrated in FIG. 1 will be described. FIG. 3 is a block diagram illustrating a schematic configuration of the pedestrian terminal device 1 and the in-vehicle terminal device 3.

  The pedestrian terminal device 1 includes a position information acquisition unit 11, an inter-vehicle communication unit 12, a low power communication unit 13, an input / output unit 14, a control unit 15, and a battery 16.

  The position information acquisition unit 11 acquires the position information of its own device by a satellite positioning system such as GPS (Global Positioning System), QZSS (Quasi-Zenith Satellite System), or GLONASS (Global Navigation Satellite System).

  The inter-step communication unit 12 performs inter-step communication with the in-vehicle terminal device 3. In this inter-vehicle communication, wireless communication is performed using a frequency band (for example, 700 MHz band or 5.8 GHz band) adopted in a safe driving support wireless system using ITS (Intelligent Transport System). Is called.

  The low power communication unit 13 performs low power communication with the in-vehicle terminal device 3. In this low power communication, Bluetooth (registered trademark), specific low power wireless using the 920 MHz band, wireless LAN such as Wi-Fi (registered trademark), etc., lower power, that is, transmission output is lower than inter-pedal communication. Small (for example, 10 mW or less) wireless communication is performed.

  The input / output unit 14 inputs / outputs information to / from the portable information terminal device 2. Based on the information output from the input / output unit 14, the portable information terminal device 2 performs an output operation for alerting a pedestrian or the like.

  The battery 16 supplies power to each part of the pedestrian terminal device 1.

  The control unit 15 controls the position information acquisition unit 11, the inter-vehicle communication unit 12, the low power communication unit 13, and the input / output unit 14, and includes a communication control unit 21 and a communication information processing unit 22. ing.

  The communication control unit 21 controls communication with the in-vehicle terminal device 3. In the present embodiment, the two operation modes of the normal mode and the intra-group terminal mode are switched. In the normal mode, information is transmitted / received by inter-walk communication with the in-vehicle terminal device 3, and in the intra-group terminal mode, information is transmitted / received by low-power communication with the in-vehicle terminal device 3 serving as a representative terminal.

  Moreover, in the communication control part 21, when the representative terminal notification from the vehicle-mounted terminal device 3 used as a representative terminal is received and predetermined | prescribed group formation conditions are satisfy | filled, it transfers to in-group terminal mode. Moreover, if the state which does not receive the representative terminal notification from the vehicle-mounted terminal device 3 which became the representative terminal continues for a predetermined time or more, the intra-group terminal mode is canceled and the normal mode is restored.

  Further, the communication control unit 21 stops the operation of the inter-vehicle communication unit 12 in the intra-group terminal mode. Specifically, power supply from the battery 16 to the inter-vehicle communication unit 12 is stopped.

  The communication information processing unit 22 processes information transmitted / received to / from the in-vehicle terminal device 3. In the normal mode, the position information of the own device is acquired from the position information acquiring unit 11, the pedestrian information including the position information of the own device is output to the inter-pedestrian communication unit 12, and the pedestrian is transmitted from the inter-pedestrian communication unit 12. Information is transmitted to the in-vehicle terminal device 3. Moreover, the vehicle information received from the vehicle-mounted terminal device 3 is acquired by the inter-step communication unit 12, and the vehicle information is output from the input / output unit 14 to the portable information terminal device.

  Further, in the intra-group terminal mode, the position information of the own device is acquired from the position information acquisition unit 11, and pedestrian information including the position information of the own device is output to the low power communication unit 13. The pedestrian information is transmitted from 13 to the in-vehicle terminal device 3 as the representative terminal. Further, the vehicle information received from the in-vehicle terminal device 3 is acquired by the low-power communication unit 13 and the vehicle information is output from the input / output unit 14 to the portable information terminal device.

  In addition, in the portable information terminal device 2, in order to perform an output operation for alerting a pedestrian or the like, it is necessary to perform a risk determination process for avoiding an accident based on position information of the pedestrian or the vehicle. Yes, this risk determination processing can also be performed by the control unit 15 of the pedestrian terminal device 1, but the pedestrian and vehicle position information and the like are provided to the portable information terminal device 2, and the portable information terminal device 2 The risk determination process may be performed by a risk determination application.

  The in-vehicle terminal device 3 includes a position information acquisition unit 31, an inter-vehicle communication unit 32, a low power communication unit 33, an inter-vehicle communication unit 34, an input / output unit 35, and a control unit 36.

  The position information acquisition unit 31 acquires the position information of its own device by the satellite positioning system, similarly to the position information acquisition unit 11 of the pedestrian terminal device 1.

  The inter-pedestrian communication unit 32 performs inter-pedal communication with the pedestrian terminal device 1. In this step-to-step communication, similarly to the step-to-step communication unit 12 of the pedestrian terminal device 1, wireless communication is performed using the frequency band adopted in the safe driving support wireless system using ITS.

  The inter-vehicle communication unit 34 performs inter-vehicle communication with other in-vehicle terminal devices 3. In this inter-vehicle communication, similarly to the inter-vehicle communication, wireless communication is performed using the frequency band adopted in the safe driving support wireless system using ITS.

  Similar to the low power communication unit 13 of the pedestrian terminal device 1, the low power communication unit 33 performs wireless communication with lower power than inter-vehicle communication.

  The input / output unit 35 inputs / outputs information to / from the car navigation device 4. Based on the information output from the input / output unit 35, the car navigation device 4 performs an output operation for alerting the driver.

  The control unit 36 controls the position information acquisition unit 31, the inter-vehicle communication unit 32, the low-power communication unit 33, the inter-vehicle communication unit 34, and the input / output unit 35. Part 42.

  The communication control unit 41 controls communication with the pedestrian terminal device 1. In the present embodiment, the two operation modes of the normal mode and the representative terminal mode are switched. In the normal mode, information is transmitted and received by inter-vehicle communication with the pedestrian terminal device 1, and in the representative terminal mode, as the representative terminal of the pedestrian terminal device 1 existing around the own device, the pedestrian terminal device 1 Send and receive information by low power communication.

  Moreover, in the communication control part 41, if the own vehicle will be in the state which satisfy | fills predetermined representative terminal transfer conditions, it will transfer to representative terminal mode spontaneously. Then, the representative terminal notification is transmitted from the low power communication unit 33. In the present embodiment, the representative terminal transition condition is that the state where the traveling speed of the vehicle is equal to or lower than the predetermined speed continues for a predetermined time or longer, that is, the vehicle is stopped or driving slowly. Note that the traveling speed of the host vehicle can be acquired from the car navigation device 4.

  Moreover, in the communication control part 41, if the own vehicle will be in the state which satisfy | fills predetermined representative terminal cancellation conditions, it will cancel | release the representative terminal mode spontaneously and will return to normal mode. In the present embodiment, a state in which the traveling speed exceeds a predetermined speed, a signal from the pedestrian terminal device 1, specifically, a state in which a state notification signal for notifying pedestrian information is not received is longer than a predetermined time. The fact that it has continued and that a predetermined time (for example, 30 minutes) has passed since the transition to the representative terminal is set as the representative terminal release condition. When at least one of these representative terminal release conditions is satisfied, the representative terminal mode is released.

  The communication information processing part 42 processes the information transmitted / received between the pedestrian terminal device 1 and the other vehicle-mounted terminal device 3. In the normal mode, the position information of the own device is acquired from the position information acquisition unit 31, the vehicle information including the position information of the own device is output to the inter-vehicle communication unit 32, and the vehicle information is received from the inter-vehicle communication unit 32. It transmits with respect to the pedestrian terminal device 1. FIG. Moreover, the pedestrian information received from the pedestrian terminal device 1 is acquired by the inter-pedestrian communication unit 32, and the pedestrian information is output from the input / output unit 35 to the car navigation device 4.

  In the representative terminal mode, the position information of the own device is acquired from the position information acquisition unit 31, the pedestrian information received from the pedestrian terminal device 1 is acquired by the low-power communication unit 33, and the position information of the own device is acquired. Is output to the inter-vehicle communication unit 34, and the inter-vehicle communication unit 34 transmits the vehicle information and the pedestrian information to the other in-vehicle terminal device 3. In addition, the pedestrian information received from the pedestrian terminal device 1 is output from the input / output unit 35 to the car navigation device 4.

  Moreover, the vehicle information received from the other in-vehicle terminal device 3 is acquired by the inter-vehicle communication unit 34, the position information of the own device is further acquired from the position information acquisition unit 31, and the own information including the position information of the own device is acquired. The vehicle information and the vehicle information of other vehicles are output to the low power communication unit 33, and the vehicle information is transmitted from the low power communication unit 33 to the pedestrian terminal device 1. Further, the vehicle information received from the other in-vehicle terminal device 3 is output from the input / output unit 35 to the car navigation device 4.

  Electric power is supplied to the in-vehicle terminal device 3 from a battery 37 mounted on the vehicle. Note that the in-vehicle terminal device 3 continues to be supplied with power from the battery 37 and operates as a representative terminal even when the engine is stopped by turning off the ignition switch of the vehicle. At this time, since the battery 37 has a sufficiently large capacity compared to the power consumption of the in-vehicle terminal device 3, there is no particular problem.

  The control unit 15 of the pedestrian terminal device 1 and the control unit 36 of the in-vehicle terminal device 3 are configured by a processor, and the communication control units 21 and 41 and the communication information processing units 22 and 42 of the control units 15 and 36 are memory units. This is realized by causing the processor to execute a predetermined program stored in the memory.

  In addition, in the car navigation device 4, in order to perform an output operation for alerting the driver, it is necessary to perform a risk determination process for avoiding an accident based on the position information of the pedestrian and the vehicle. The risk determination process can be performed by the control unit 36 of the in-vehicle terminal device 3, but the car navigation device 4 is provided with position information of pedestrians and vehicles, and the risk determination application of the car navigation device 4 is used. A risk determination process may be performed.

  The inter-vehicle communication units 12, 32, the low-power communication units 13, 33, and the inter-vehicle communication unit 34 are basically configured to transmit necessary information by broadcast (broadcast communication). 1 and the identification information (terminal ID, MAC address, etc.) of the in-vehicle terminal device 3 are added, and the transmission destination is designated and transmitted, whereby unicast (one-to-one communication) or multicast (one-to-many communication) is set. It is possible to select an appropriate communication form according to the situation.

  Next, a communication procedure in the pedestrian terminal device 1 and the in-vehicle terminal device 3 shown in FIG. 1 will be described. FIG. 4 is a sequence diagram showing a communication procedure in the pedestrian terminal device 1 and the in-vehicle terminal device 3.

  In the in-vehicle terminal device 3, when a predetermined representative terminal transition condition is generated and a transition is made to the representative terminal mode to be the representative terminal of the pedestrian terminal device 1, a representative terminal notification is transmitted by low power communication. The transmission of the representative terminal notification is periodically repeated until the representative terminal is released after the in-vehicle terminal device 3 shifts to the representative terminal.

  When the pedestrian terminal device 1 receives the representative terminal notification from the in-vehicle terminal device 3 that has become the representative terminal, the in-group terminal device 3 sends the representative terminal notification to the in-group terminal device 3 when the own device satisfies the group formation condition. A terminal request is transmitted by low power communication. This intra-group terminal request is for requesting that the self-device communicates as an intra-group terminal with the in-vehicle terminal device 3 that has transmitted the representative terminal notification as the representative terminal. Identification information (terminal ID, MAC address, etc.) of the in-vehicle terminal device 3 is added.

  Next, when the in-group terminal request from the pedestrian terminal apparatus 1 is received, the in-vehicle terminal apparatus 3 that has become the representative terminal recognizes that the pedestrian terminal apparatus 1 communicates as an in-group terminal. The representative terminal notification including the identification information of the pedestrian terminal device 1 that is the transmission source of the terminal request is transmitted by low power communication.

  When the pedestrian terminal device 1 receives the representative terminal notification including the identification information of the own device, the pedestrian terminal device 1 shifts to the intra-group terminal mode and stops the inter-pedal communication. And own pedestrian information is transmitted to the vehicle-mounted terminal device 3 used as a representative terminal by low power communication.

  When receiving the pedestrian information from the pedestrian terminal device 1, the in-vehicle terminal device 3 that has become the representative terminal transmits the pedestrian information and its own vehicle information to the other in-vehicle terminal device 3 through inter-vehicle communication. . At this time, if the pedestrian information transmitted from a plurality of pedestrian terminal devices 1 is transmitted all at once, the amount of communication may be reduced, but every time pedestrian information is received, the pedestrian Information may be transmitted.

  In addition, when the vehicle information transmitted from the other vehicle-mounted terminal device 3 by inter-vehicle communication is received by the vehicle-mounted terminal device 3 that has become the representative terminal, the vehicle information of the other vehicle and its own vehicle information are transmitted by low-power communication. It transmits to the pedestrian terminal device 1 in a group.

  And in the vehicle-mounted terminal device 3 which transfered to the representative terminal, if the own vehicle will be in the state which satisfy | fills predetermined representative terminal cancellation conditions, it will cancel representative terminal mode, will return to normal mode, and will stop transmission of a representative terminal notification.

  In the pedestrian terminal device 1, when the state in which the representative terminal notification from the in-vehicle terminal device 3 is not received continues for a predetermined time, the intra-group terminal mode is canceled, the normal mode is restored, and inter-pedal communication is resumed.

  The in-vehicle terminal device 3 may shift to the representative terminal mode when the in-group terminal request from the pedestrian terminal device 1 is received.

  By the way, in this embodiment, the representative terminal notification to which the identification information of the in-vehicle terminal device 3 is added and the identification of the pedestrian terminal device 1 between the in-vehicle terminal device 3 and the pedestrian terminal device 1 which are representative terminals. By exchanging information with the terminal request in the group to which information is added, the in-vehicle terminal device 3 that has become the representative terminal recognizes the pedestrian terminal device 1 in the group, and the pedestrian terminal device 1 in the group is the representative. Although the vehicle-mounted terminal device 3 that has become a terminal can be recognized, the following modifications are also possible.

  First, the in-vehicle terminal device 3 that has become the representative terminal is assumed to continue the representative terminal mode for a predetermined time, and the remaining time until the time is up is added to the vehicle information and broadcast to the pedestrian terminal device 1. Send. When the pedestrian terminal device 1 receives the vehicle information to which the remaining time is added, when the own device satisfies the group formation condition, the pedestrian terminal device 1 shifts to the intra-group terminal mode. And when the vehicle information from the vehicle-mounted terminal device 3 used as the representative terminal is sequentially received and the remaining time falls below a predetermined threshold value, an in-group terminal request is transmitted. When the in-group terminal request from the pedestrian terminal device 1 can be received by the in-vehicle terminal device 3 that has become the representative terminal, the representative terminal mode is continued and the in-group terminal request from the pedestrian terminal device 1 is received. If not, the representative terminal mode is canceled.

  Thereby, the pedestrian terminal device 1 that does not transmit the intra-group terminal request leaves the group, and the pedestrian terminal device 1 that transmits the intra-group terminal request continues to participate in the group and transmits the intra-group terminal request. When the person terminal device 1 is completely removed, the group is dissolved, that is, the representative terminal can be released.

  As another modification, the in-group terminal request is periodically transmitted to the in-vehicle terminal device 3 in which the pedestrian terminal device 1 in the group is the representative terminal at a predetermined interval, and the in-vehicle terminal device that is the representative terminal 3, the representative terminal mode is canceled when the representative terminal release condition is satisfied with the representative terminal release condition that the state in which the in-group terminal request from the pedestrian terminal device 1 is not received continues for a predetermined time or longer. You may do it.

  Next, a process procedure in the in-vehicle terminal device 3 shown in FIG. 1 will be described. FIG. 5 is a flowchart showing a processing procedure in the in-vehicle terminal device 3.

  The in-vehicle terminal device 3 first receives the pedestrian information transmitted from the surrounding pedestrian terminal device 1 by inter-pedestrian communication in the normal mode, and also walks its own vehicle information to the surrounding pedestrian terminal device 1. Processing to transmit by inter-vehicle communication is performed (ST101).

  Then, if the host vehicle is in a state that satisfies a predetermined representative terminal transition condition (Yes in ST102) and has not already transitioned to the representative terminal mode (No in ST103), the host vehicle transitions to the representative terminal mode (ST104). In this embodiment, the representative terminal transition condition is that the state where the traveling speed of the host vehicle is equal to or lower than the predetermined speed continues for a predetermined time, that is, the host vehicle is stopped or driving slowly. Yes.

  After shifting to the representative terminal mode in this way, the in-vehicle terminal device 3 first starts a process of transmitting a representative terminal notification to the pedestrian terminal device 1 at a predetermined interval by low power communication (ST105).

  And the process which receives the pedestrian information transmitted by low power communication from the pedestrian terminal device 1 in a group, and transmits the pedestrian information and own vehicle information to the other in-vehicle terminal device 3 by inter-vehicle communication. Performed (ST106). Moreover, the process which receives the vehicle information transmitted by the vehicle-to-vehicle communication from the other vehicle-mounted terminal device 3 and transmits the vehicle information to the pedestrian terminal device 1 in the group by the low power communication is performed (ST107).

  On the other hand, if it is already the representative terminal mode (Yes in ST103), no special processing is performed, and the operation in the representative terminal mode is continued (ST106, 107).

  Further, the host vehicle is not in a state satisfying the representative terminal transition condition (No in ST102), has already shifted to the representative terminal mode (Yes in ST108), and the host vehicle satisfies the predetermined representative terminal release condition. If it is in a state (Yes in ST109), the representative terminal mode is canceled and the normal mode is restored (ST110).

  Here, in the present embodiment, it is predetermined that the traveling speed has exceeded a predetermined speed, that a signal from the pedestrian terminal device 1, specifically, a state notification signal for notifying pedestrian information is not received. It is assumed that the representative terminal cancellation condition is that it has continued for a predetermined time or more and that a predetermined time (for example, 30 minutes) has elapsed since the transition to the representative terminal. When at least one of these representative terminal release conditions is satisfied, the representative terminal mode is released.

  When the traveling speed exceeds a predetermined speed, that is, when the vehicle starts running, the representative terminal mode is canceled because it is inappropriate as the representative terminal. Moreover, when the state notification signal from the pedestrian terminal device 1 is not received, that is, when the pedestrian terminal device 1 does not exist in the vicinity, the representative terminal mode is canceled because it is not necessary to continue the representative terminal mode. In addition, since it is inappropriate to make one in-vehicle terminal device 3 a representative terminal for a long time, the representative terminal mode is canceled when a predetermined time has elapsed since the transition to the representative terminal. Thus, if there is another in-vehicle terminal device 3 suitable as a representative terminal, the in-vehicle terminal device 3 becomes the representative terminal, and the in-vehicle terminal device 3 sequentially changes to become the representative terminal.

  Further, when the mode has not been shifted to the representative terminal mode (No in ST108), no special processing is performed and the operation in the normal mode is continued (ST101). In addition, when the terminal has already shifted to the intra-group terminal mode (Yes in ST108) but the vehicle is not in a state that satisfies the predetermined representative terminal release condition (No in ST109), no special processing is performed and the representative The operation in the terminal mode is continued (ST106, 107).

  In addition, the low power communication and inter-vehicle communication (ST106, ST107) performed in the representative terminal mode are performed regularly at predetermined intervals, the distance between the pedestrian terminal device 1 and the in-vehicle terminal device 3, You may make it change the time interval of communication according to the relative speed between the pedestrian terminal device 1 and the vehicle-mounted terminal device 3. FIG. For example, when the distance between the pedestrian terminal device 1 and the in-vehicle terminal device 3 is short, the communication time interval is shortened, and the relative orientation between the pedestrian terminal device 1 and the in-vehicle terminal device 3 is close. When the speed is high, the communication time interval is shortened. In these cases, there is a high possibility that a traffic accident will occur. Therefore, it is possible to achieve both prevention of traffic accidents and reduction in communication frequency by changing the communication time interval.

  Next, a processing procedure in the pedestrian terminal device 1 shown in FIG. 1 will be described. FIG. 6 is a flowchart showing a processing procedure in the pedestrian terminal device 1.

  In the pedestrian terminal device 1, first, in the normal mode, the vehicle information transmitted by the inter-vehicle communication is received from the surrounding in-vehicle terminal device 3, and the own pedestrian information is transferred to the in-vehicle terminal device 3 in the vicinity. Processing to transmit by communication is performed (ST201).

  If the representative terminal notification transmitted by low-power communication is received from the in-vehicle terminal device 3 that has become the representative terminal (Yes in ST202), and if it is not already in the intra-group terminal mode (No in ST208), the intra-group terminal The mode is shifted to (ST204), and the operation of the inter-vehicle communication unit 12 is stopped (ST205). And the vehicle information transmitted by low power communication from the vehicle-mounted terminal device 3 is received, and pedestrian information is transmitted to the vehicle-mounted terminal device 3 by low power communication (ST206).

  In this embodiment, when the pedestrian terminal device 1 exists in the group formation area set based on the vehicle-mounted terminal device 3 that is the representative terminal, the group formation condition is satisfied. Shift to in-group terminal mode.

  On the other hand, if it is already in the intra-group terminal mode (Yes in ST203), no special processing is performed, and the operation in the intra-group terminal mode is continued (ST206).

  In addition, the representative terminal notification from the in-vehicle terminal device 3 that has become the representative terminal cannot be received (No in ST202), the terminal mode is already in the group (Yes in ST207), and the representative terminal notification is not received. If the state of not receiving is continued for a predetermined time (Yes in ST208), the intra-group terminal mode is canceled to return to the normal mode (ST209), and the operation of the inter-pedal communication unit 12 is resumed ( ST210).

  If the terminal mode has not been changed to the intra-group terminal mode (No in ST207), no special processing is performed. In addition, when the terminal mode has already been shifted to the intra-group terminal mode (Yes in ST207) but the state where the representative terminal notification has not been received does not continue for a predetermined time (No in ST208), the intra-group terminal mode The operation is continued (ST206).

  In the present embodiment, the pedestrian terminal device 1 is configured to stop the communication between the pedestrians when shifting to the intra-group terminal mode. However, a configuration in which the communication between the pedestrians is not stopped is also possible. In this case, the periodic transmission of the representative terminal notification from the in-vehicle terminal device 3 that has become the representative terminal can be performed by inter-step communication. In addition, transmission of the intra-group terminal request from the pedestrian terminal device 1 can be performed by inter-vehicle communication.

  As described above, in the present embodiment, the in-vehicle terminal device 3 mounted on the vehicle becomes the representative terminal of the pedestrian terminal device 1 existing in the vicinity thereof, and the in-vehicle terminal in which the pedestrian terminal device 1 becomes the representative terminal. Information is transmitted / received to / from the device 3 by low power communication. For this reason, the power consumption of the pedestrian terminal device 1 can be suppressed and power saving of the pedestrian terminal device 1 can be achieved, and even in a situation where there are a large number of pedestrian terminal devices 1 and in-vehicle terminal devices 3, communication is possible. Traffic congestion can be reduced by reducing the traffic. In addition, although power consumption of the vehicle-mounted terminal device 3 may increase because the vehicle-mounted terminal device 3 becomes a representative terminal, since the large-capacity battery 37 is mounted on the vehicle, there is no significant influence.

  Moreover, in this embodiment, when the pedestrian terminal device 1 shifts to the intra-group terminal mode, the operation of the inter-pedestrian communication unit 12 is stopped, so that further power saving of the pedestrian terminal device 1 can be achieved. it can.

  Moreover, in this embodiment, the vehicle-mounted terminal device 3 which satisfy | fills representative terminal transfer conditions, ie, is suitable as a representative terminal of the pedestrian terminal device 1, becomes a representative terminal spontaneously. For this reason, the vehicle-mounted terminal device 3 suitable as a representative terminal of the pedestrian terminal device 1 can be quickly made a representative terminal.

  In this embodiment, necessary information is transmitted and received by inter-vehicle communication between the in-vehicle terminal device 3 that is the representative terminal and the other in-vehicle terminal device 3, but the in-vehicle terminal device that is the representative terminal. 3 may be regarded as a pedestrian, and the in-vehicle terminal device 3 that has become a representative terminal may perform inter-pedal communication with another in-vehicle terminal device 3. This also applies to the embodiments described below.

  By the way, in this inter-pedestrian communication system, as pedestrian information and vehicle information, position information of pedestrians and vehicles, and further information on traveling direction and moving speed, etc. are communicated. It is also possible to communicate such information.

  For example, when the vehicle is stopped on a road, the vehicle may be stopped unavoidably due to a vehicle failure or accident. In this case, it is preferable that the driver of another vehicle can be notified that a broken vehicle or an accident vehicle has stopped in front of the course. Therefore, the in-vehicle terminal device 3 that has become the representative terminal causes the driver of the own vehicle to input the cause of the stop, and information indicating that the vehicle is a faulty vehicle or an accident vehicle is transmitted to the other on-vehicle communication by inter-vehicle communication together with position information. You may make it transmit to the terminal device 3. FIG. Thereby, the driver of the other vehicle can know that the broken vehicle is stopped.

  Further, when the vehicle is stopped on the road, it may stop for reasons such as loading and unloading of luggage. In this case, it is preferable that the scheduled stop time of the vehicle can be notified to the driver of the other vehicle. Therefore, the in-vehicle terminal device 3 that has become the representative terminal causes the driver of the host vehicle to input the scheduled stop time, and transmits information related to the planned stop time to other in-vehicle terminals through inter-vehicle communication together with position information and the like. You may do it. As a result, the driver of another vehicle can know how much the stopped vehicle is stopped afterward.

  Moreover, when the vehicle is stopped on the road, there is a case of annoying parking. In this case, it is desirable to be able to notify the driver of the vehicle of the complaint. Therefore, in the in-vehicle terminal device 3 of another vehicle, it is determined whether or not it is annoying parking based on the stop position of the vehicle. The vehicle-mounted terminal device 3 that has been transferred to the representative terminal is transmitted by inter-vehicle communication, and the vehicle-mounted terminal device 3 that has been transferred to the representative terminal is configured to transmit a complaint notification to the pedestrian terminal device 1 through low-power communication together with position information and the like. May be. As a result, the pedestrian terminal device 1 possessed by the driver receives the complaint notification, and the driver can know that the complaint is coming to his / her vehicle.

  In addition, when the road is crowded, complaint notifications may be flooded. In this case, every time a complaint notification is received from another in-vehicle terminal device 3, it may be transmitted to the pedestrian terminal device 1, but an upper limit value of the number of complaint notification transmissions may be set, or a complaint notification may be transmitted in a predetermined manner. You may make it transmit by a period, and may make it limit complaint notification. Further, the notification to the driver of the vehicle that is stopped is not limited to the notification of complaints regarding nuisance parking, and various notifications are possible.

  Here, the pedestrian can include a person (that is, a pedestrian in a broad sense) riding on a vehicle such as a bicycle, a senior car, an electric wheelchair, or an agricultural machine, and the person riding on such a vehicle. The pedestrian terminal device 1 possessed by communicates with the in-vehicle terminal device 3 that has become the representative terminal.

  The in-vehicle terminal device 3 serving as the representative terminal is not limited to the pedestrian terminal device 1 but also other vehicles (for example, other vehicles that are stopped or driving slowly (including faulty vehicles and accident vehicles), motorcycles, and the like. In-vehicle terminal devices 3 such as mini vehicles, driving schools, vehicles driven by drivers with low driving history, vehicles driven by drivers who are not good at driving, etc. It is also possible to notify the other in-vehicle terminal device 3 of the position information 3 and the like. For example, for a driving school driving vehicle, a vehicle driven by a driver with a low driving history, a vehicle driven by a driver who is not good at driving, etc., it is possible that traffic accidents will increase the number of traffic accidents. There is also an effect that it is possible to prevent such a situation. Furthermore, the position information and the like are collected from the in-vehicle terminal devices 3 of the vehicles that are relatively likely to be victims of traffic accidents such as motorcycles and light vehicles, and the position information of each in-vehicle terminal device 3 is collected to the other in-vehicle terminal devices 3. It is also possible to notify. By doing so, there is also an effect that it is possible to prevent a motorcycle accident or the like when turning left.

  In addition, the present invention is effective not only on general roads but also on expressways. For example, when a vehicle breaks down on a highway and there are people on the shoulder, it is possible to quickly find both the broken vehicle and the person on the shoulder, and this also has the effect of preventing accidents on the highway. In addition, the problem of pedestrians getting lost on the expressway has been increasing recently, but the location information of pedestrians getting lost on the expressway is notified from the communication equipment installed at the entrance and exit of the expressway and the inspection vehicle that is stopped. This makes it possible to detect pedestrians who have lost their way to the expressway.

(Second Embodiment)
Next, a second embodiment will be described. Note that points not particularly mentioned here are the same as in the above embodiment. FIG. 7 is an explanatory diagram showing a communication state in the inter-vehicle communication system according to the second embodiment.

  In the first embodiment, when the host vehicle is in a state where the predetermined representative terminal transition condition is satisfied, the in-vehicle terminal device 3 voluntarily shifts to the representative terminal. In the second embodiment, the host vehicle shifts to the representative terminal. The in-vehicle terminal device 3 to be selected is selected by another in-vehicle terminal device 3.

  That is, when the in-vehicle terminal device 3 detects another vehicle that satisfies a predetermined representative terminal transition condition, the in-vehicle terminal device 3 transmits a representative terminal transition request to the in-vehicle terminal device 3 of the vehicle by inter-vehicle communication, and the corresponding vehicle is mounted on the vehicle. When the terminal device 3 receives the representative terminal shift request, the terminal device 3 shifts to the representative terminal mode and transmits a representative terminal notification to the pedestrian terminal device 1 by low power communication.

  In the present embodiment, as in the first embodiment, the representative terminal transition condition is that the state where the traveling speed is equal to or lower than the predetermined speed is continued for a predetermined time, that is, the vehicle is stopped or driving slowly. It is said. Further, if there is no pedestrian around the vehicle, there is no need to use the in-vehicle terminal device 3 of the vehicle as a representative terminal. Therefore, in addition to satisfying the representative terminal transition condition, there are pedestrians in the peripheral area of the vehicle. On the condition, the in-vehicle terminal device 3 to be transferred to the representative terminal is selected.

  Next, a communication procedure in the pedestrian terminal device 1 and the in-vehicle terminal device 3 shown in FIG. 7 will be described. FIG. 8 is a sequence diagram showing a communication procedure in the pedestrian terminal device 1 and the in-vehicle terminal device 3.

  The communication procedure in the pedestrian terminal device 1 and the in-vehicle terminal device 3 in the present embodiment shown in FIG. 8 is substantially the same as the example shown in FIG. When the other vehicle satisfying the representative terminal transition condition is detected, a representative terminal transition request is transmitted to the in-vehicle terminal device 3 of the vehicle by inter-vehicle communication, and the in-vehicle terminal device 3 that has received the representative terminal transition request It transfers to terminal mode and a representative terminal notification is transmitted to the pedestrian terminal device 1 by low power communication.

  Next, a processing procedure in the in-vehicle terminal device 3 illustrated in FIG. 7 will be described. 9 and 10 are flowcharts showing the processing procedure in the in-vehicle terminal device 3, and FIG. 9 shows the case of the in-vehicle terminal device 3 on the side of selecting the in-vehicle terminal device 3 to be a representative terminal. Shows the case of the in-vehicle terminal device 3 on the side serving as the representative terminal.

  First, the in-vehicle terminal device 3 on the side for selecting the in-vehicle terminal device 3 to be a representative terminal will be described.

  As shown in FIG. 9, in the in-vehicle terminal device 3, first, vehicle information transmitted from other in-vehicle terminal devices 3 through vehicle-to-vehicle communication is received, and transmitted from the pedestrian terminal device 1 through inter-vehicle communication. Pedestrian information is received (ST301).

  Next, it is determined whether there is another vehicle that satisfies a predetermined representative terminal transition condition (ST302). In this embodiment, when the state where the traveling speed is equal to or lower than the predetermined speed continues for a predetermined time, that is, the vehicle is stopped or driving slowly, the representative terminal transition condition is set. The determination is performed based on the vehicle position information and speed information acquired by inter-vehicle communication.

  Here, in the vehicle-mounted terminal device 3, when the vehicle is stopped or driven slowly, the vehicle information may be transmitted to the surrounding vehicle-mounted terminal device 3 at a predetermined interval by inter-vehicle communication. Thereby, in the vehicle-mounted terminal device 3 on the side of selecting the vehicle-mounted terminal device 3 to be the representative terminal, it is possible to find a vehicle that is stopped or driving slowly.

  Next, it is determined whether or not there is a pedestrian around another vehicle that satisfies the representative terminal transition condition (ST303). This determination is performed based on the vehicle position information acquired from the in-vehicle terminal device 3 of the vehicle and the pedestrian position information acquired from the pedestrian terminal device 1.

  When another vehicle satisfying the representative terminal transition condition is found (Yes in ST302) and a pedestrian existing around the vehicle is found (Yes in ST303), the representative terminal transitions to the in-vehicle terminal device 3 of the vehicle. The request is transmitted by inter-vehicle communication (ST304).

  On the other hand, when no other vehicle satisfying the representative terminal transition condition is found (No in ST102), or when a corresponding pedestrian is found but no pedestrian existing around the vehicle is found (No in ST103). No particular processing is performed.

  In addition, you may make it perform the process which transmits the complaint notification of annoying parking following the said process. In this case, first, it is determined whether or not the vehicle is a nuisance parking based on the stop position of the vehicle. When the parking is a nuisance parking, a complaint notification is transmitted to the in-vehicle terminal device 3 of the vehicle by inter-vehicle communication.

  Next, the in-vehicle terminal device 3 on the side serving as the representative terminal will be described.

  In this case, as shown in FIG. 10, the processing procedure in the in-vehicle terminal device 3 is substantially the same as the example shown in FIG. Is received (Yes in ST401), the mobile terminal shifts to the representative terminal mode. Here, if the mode has already been switched to the representative terminal mode (Yes in ST103), the representative terminal transition request is ignored.

  In addition, if the identification information of the target in-vehicle terminal device 3 is added to the representative terminal transition request, the in-vehicle terminal device 3 that has received the representative terminal transition request grasps that it is a representative terminal transition request for its own device. can do.

  When the vehicle enters a state where the predetermined representative terminal release condition is satisfied (Yes in ST109), the representative terminal mode is released spontaneously and the normal mode is restored. In the present embodiment, as in the example shown in FIG. 5, the traveling speed exceeds a predetermined speed, the state in which the state notification signal from the pedestrian terminal device 1 is not received continues for a predetermined time, The representative terminal release condition is that a predetermined time has passed since the terminal was shifted to the terminal. When at least one of these representative terminal release conditions is satisfied, the representative terminal mode is released and the normal mode is restored.

  In the in-vehicle terminal device 3, when the own vehicle is in a state where the representative terminal transition condition is satisfied, vehicle information including the position information of the own vehicle is transmitted by inter-vehicle communication, and subsequently, the other in-vehicle terminal device 3 represents the representative information. When a terminal transfer request is received, the terminal may be transferred to the representative terminal.

  As described above, in the present embodiment, the in-vehicle terminal device 3 that satisfies the representative terminal transition condition, that is, suitable as the representative terminal of the pedestrian terminal device 1 is selected by the other in-vehicle terminal device 3. Thereby, the vehicle-mounted terminal device 3 suitable as a representative terminal of the pedestrian terminal device 1 can be quickly made a representative terminal.

  Moreover, in this embodiment, when there is no pedestrian around the target vehicle, since the representative terminal shift request is not transmitted to the in-vehicle terminal device 3 of the vehicle, the in-vehicle terminal device 3 is transferred to the representative terminal uselessly. Can be avoided.

(Third embodiment)
Next, a third embodiment will be described. Note that points not particularly mentioned here are the same as in the above embodiment. FIG. 11 is an explanatory diagram showing a communication status in the inter-vehicle communication system according to the third embodiment.

  In the present embodiment, an intersection, which is a frequent accident zone, is set as a dangerous area, and a target area is set in a predetermined range including the dangerous area. When a vehicle enters the target area, an in-vehicle terminal mounted on the vehicle The device 3 becomes a representative terminal. And the pedestrian terminal device 1 which exists in the predetermined range (group formation area) on the basis of the vehicle-mounted terminal device 3 used as the representative terminal forms the group which uses the vehicle-mounted terminal device 3 as a common representative terminal.

  The group formation area may be an area within a predetermined distance from the in-vehicle terminal device 3 that is the representative terminal. However, when the target area or the dangerous area falls within the communicable area for low power communication, You may make it make only a pedestrian terminal device 1 which exists in a target area or a danger area join a group by making a danger area into a group formation area.

  The pedestrian terminal device 1 in the group transmits pedestrian information (position information and the like) to the in-vehicle terminal device 3 that has become the representative terminal by low power communication. When the pedestrian information is received from the pedestrian terminal device 1, the in-vehicle terminal device 3 that has become the representative terminal sends the pedestrian information and its own vehicle information (position information, etc.) to the in-vehicle terminal device 3 in the vicinity. Send by communication.

  Moreover, in the vehicle-mounted terminal device 3 which became the representative terminal, when vehicle information (position information, etc.) is received from the surrounding vehicle-mounted terminal device 3 by inter-vehicle communication, the vehicle information and its own vehicle information are used for walking within the group. To the person terminal device 1 by low power communication.

  In this way, the pedestrian and vehicle position information existing around the intersection is notified to the surrounding pedestrian terminal device 1 and the in-vehicle terminal device 3, and is necessary based on the pedestrian and vehicle position information. Depending on the situation, by alerting pedestrians and vehicle drivers, traffic accidents in the vicinity of intersections where accidents occur frequently can be reduced.

  Here, the in-vehicle terminal device 3 that has become the representative terminal may notify the pedestrian information and the vehicle information limited to pedestrians and vehicles existing in the danger area. Thereby, useless notification can be avoided.

  In addition, in order to limit to pedestrians and vehicles existing in the danger area, the position information of the pedestrian and the vehicle is compared with the position information of the danger area, and whether or not the pedestrian and the vehicle exist in the danger area. This process may be performed by the in-vehicle terminal device 3 that has become the representative terminal. However, in the pedestrian terminal device 1 and other in-vehicle terminal devices 3, When notifying the vehicle information, it is determined whether or not the own device is present in the dangerous area, and only when the own device is present in the dangerous area, the pedestrian information and the vehicle information are reported. It may be.

  In addition, the procedure of the process performed by the in-vehicle terminal device 3 in the present embodiment is substantially the same as the example shown in FIG. 5, but in particular in the present embodiment, the own vehicle approaches the intersection, specifically, the intersection The vehicle has entered the target area set within a predetermined range from the vehicle and the state where the traveling speed of the host vehicle is below the predetermined speed has continued for a predetermined period of time, that is, the host vehicle is stopped or slowed down. When it is in operation, the representative terminal transition condition is set, and when the representative terminal transition condition is satisfied (Yes in ST102 in FIG. 5), the in-vehicle terminal device 3 transitions to the representative terminal mode.

  In the present embodiment, when the host vehicle leaves the intersection, that is, the host vehicle has moved out of the target area as a representative terminal release condition, the representative terminal release condition is satisfied (Yes in ST109 of FIG. 5). ), Cancel the representative terminal mode and return to the normal mode.

  Moreover, it is the same as that of the example shown in FIG. 5, the traveling speed has exceeded a predetermined speed, the state in which the state notification from the pedestrian terminal device 1 has not been received has continued for a predetermined time, and the transition to the representative terminal The representative terminal transition condition is that a predetermined time has passed since then, and the representative terminal mode is canceled when at least one of these representative terminal cancellation conditions is satisfied.

  As described above, in the present embodiment, when the target area is set around the accident-prone area, which is a dangerous area, and the vehicle enters the target area, the in-vehicle terminal device 3 mounted on the vehicle is the representative terminal. Become. As a result, communication congestion in the accident-prone area can be reduced, and traffic accidents in the accident-prone area can be reliably reduced.

  In addition, in the vehicle-mounted terminal device 3 which became the representative terminal, when providing the pedestrian information acquired from the pedestrian terminal device 1 to the other vehicle-mounted terminal device 3 by inter-vehicle communication, the destination of the pedestrian information is You may make it narrow down with. For example, pedestrian information may be provided only for a specific vehicle type such as a large vehicle such as a truck or a bus or a motorcycle. Moreover, you may enable it to select suitably the provision destination of pedestrian information according to the condition of the surrounding vehicle, etc.

(Fourth embodiment)
Next, a fourth embodiment will be described. Note that points not particularly mentioned here are the same as in the above embodiment. FIG. 12 is an explanatory diagram illustrating a communication state in the inter-vehicle communication system according to the fourth embodiment.

  In the present embodiment, a target area is set around the railroad crossing, and when a vehicle enters the target area, the in-vehicle terminal device 3 mounted on the vehicle becomes the representative terminal. And the pedestrian terminal device 1 which exists in the predetermined range (group formation area) on the basis of the vehicle-mounted terminal device 3 used as the representative terminal forms the group which uses the vehicle-mounted terminal device 3 as a common representative terminal.

  Moreover, in this embodiment, the vehicle-mounted terminal device 3 is mounted in the train, and this vehicle-mounted terminal device 3 becomes a provision destination of the pedestrian information (position information etc.) acquired from the pedestrian terminal device 1 by the representative terminal. . Moreover, train information such as train position information is provided from the in-vehicle terminal device 3 of the train to the pedestrian terminal device 1 via the in-vehicle terminal device 3 that is the representative terminal.

  Specifically, in the pedestrian terminal device 1 in the group, the pedestrian information (position information and the like) is transmitted to the in-vehicle terminal device 3 serving as the representative terminal by low power communication. When the pedestrian information is received from the pedestrian terminal device 1, the in-vehicle terminal device 3 that has become the representative terminal sends the pedestrian information and its own vehicle information (position information, etc.) to the in-vehicle terminal device 3 of the train. Send by communication.

  Moreover, in the vehicle-mounted terminal device 3 of a train, train information (position information etc.) is transmitted to the vehicle-mounted terminal device 3 which became a representative terminal by vehicle-to-vehicle communication. When receiving the train information from the in-vehicle terminal device 3 of the train, the in-vehicle terminal device 3 serving as the representative terminal transmits the train information and its own vehicle information to the pedestrian terminal device 1 in the group by low power communication. .

  In this way, the position information of the pedestrians existing around the railroad crossing is notified to the in-vehicle terminal device 3 of the train, and the train driver is alerted as necessary based on the position information of the pedestrians. By performing the above, it is possible to reduce crossing accidents. In addition, train position information and the like are notified to the pedestrian terminal device 1 and the in-vehicle terminal device 3 existing in the vicinity of the railroad crossing, and based on the train position information and the like, the pedestrian and the vehicle driver are provided as necessary. By calling attention, crossing accidents can be reduced.

  In addition to the train position information, information related to the train operation status (speed, brake operation, etc.) may be notified to the pedestrian terminal device 1 and the in-vehicle terminal device 3 as train information.

  Further, since the traveling speed of the vehicle is low in the vicinity of the railroad crossing, the possibility of an accident between the pedestrian and the vehicle is low. Therefore, in the pedestrian terminal device 1 and the in-vehicle terminal device 3, when the vehicle enters the target area, You may make it stop operation | movement of the inter-vehicle communication parts 12 and 32. FIG.

  In order to prevent a railroad crossing accident, the inter-vehicle communication with the train has a large output and the power consumption increases so that the train can communicate with the on-vehicle terminal device 3 of the train at a position sufficiently away from the railroad crossing. . For this reason, in the vehicle-mounted terminal device 3, the vehicle-to-vehicle communication may be started when entering the target area.

  When there is no vehicle in the target area around the railroad crossing, the pedestrian terminal device 1 communicates directly with the in-vehicle terminal device 3 of the train through inter-step communication. At this time, when the pedestrian terminal device 1 receives a signal from the in-vehicle terminal device 3 serving as the representative terminal, the inter-pedestrian communication is stopped, the group communication by the low power communication is started, and the in-vehicle serving as the representative terminal. When the state in which the signal from the terminal device 3 is not received continues for a predetermined time or longer, the inter-step communication may be started to directly communicate with the in-vehicle terminal device 3 of the train.

  Further, the procedure of processing performed in the in-vehicle terminal device 3 in the present embodiment is substantially the same as the example shown in FIG. 5, but in particular in the present embodiment, the host vehicle approaches a railroad crossing. The vehicle has entered the target area set within a predetermined range from the vehicle and the vehicle travel speed has been kept below the predetermined speed for a predetermined time or longer, that is, the host vehicle is stopped or driven slowly If the representative terminal transition condition is satisfied, and the representative terminal transition condition is satisfied (Yes in ST102 in FIG. 5), the in-vehicle terminal device 3 transitions to the representative terminal mode.

  Further, in the present embodiment, when the host vehicle leaves the railroad crossing, that is, the host vehicle has moved out of the target area as a representative terminal release condition, the representative terminal release condition is satisfied (Yes in ST109 of FIG. 5). ), Cancel the representative terminal mode and return to the normal mode.

  Further, similarly to the example shown in FIG. 5, since the traveling speed has exceeded a predetermined speed, the state in which the state notification from the pedestrian terminal is not received continues for a predetermined time, or after the transition to the representative terminal. A representative terminal release condition is that a predetermined time (for example, several hours) has passed, and the representative terminal mode is released when at least one of these representative terminal release conditions is satisfied.

  Further, in the present embodiment, as shown in FIG. 12, a dangerous area is set inside the circuit breaker in consideration of detection error of position information. In particular, a predetermined range is excluded from the circuit breaker. An area with a high risk inside is designated as a dangerous area. And only when a pedestrian and a vehicle are in a danger area, pedestrian information and vehicle information are notified to the vehicle-mounted terminal device 3 of a train. Due to location information detection error, there is a possibility of misjudging that you are in the danger area even though you are waiting for the train to pass outside the circuit breaker. Then, by making the inside area with a high degree of danger as a dangerous area, it is possible to avoid erroneous determination.

  Specifically, when the in-vehicle terminal device 3 serving as the representative terminal receives pedestrian information transmitted from the pedestrian terminal device 1 by low power communication, the position information of the pedestrian included in the pedestrian information is dangerous. Compared with the position information of the area, a pedestrian existing in the danger area is selected, and the pedestrian information related to the pedestrian is transmitted to the in-vehicle terminal device 3 of the train by inter-vehicle communication. At this time, when the own vehicle exists in the danger area, the vehicle information related to the own vehicle is also transmitted to the in-vehicle terminal device 3 of the train.

  And in the vehicle-mounted terminal device 3 of a train, a suitable warning is given with respect to the driver of a train based on pedestrian information and vehicle information. As a result, unnecessary warnings can be eliminated and crossing accidents can be reliably reduced.

  In addition, when the pedestrian terminal device 1 notifies the in-vehicle terminal device 3 that has become its representative terminal of its own pedestrian information, it is determined whether or not the own device is present in the danger area. You may make it notify pedestrian information only when it exists in a danger area.

  In addition to the fact that the pedestrian is in the hazardous area, the pedestrian information is only when the pedestrian is not moving, that is, when the pedestrian is stationary in the dangerous area due to some trouble such as sudden illness. May be notified to the on-vehicle terminal device 3 of the train.

  As described above, in this embodiment, when a target area is set around a railroad crossing and the vehicle enters the target area, the in-vehicle terminal device 3 mounted on the vehicle is a pedestrian present around the railroad crossing. It becomes the representative terminal of the terminal device. As a result, it is possible to reduce communication congestion in the vicinity of a level crossing and reliably reduce a level crossing accident.

  Since communication with the train is long-distance communication, the power consumption is large with high output, so the pedestrian terminal device 1 directly communicates with the in-vehicle terminal device 3 of the train through inter-pedal communication. As a result, there is a problem that the consumption of the battery 16 of the pedestrian terminal device 1 is greatly increased. However, in the in-vehicle terminal device 3, it is only necessary to supply necessary power from a large-capacity battery 37 mounted on the vehicle. There is no problem with high-power communication.

  Also, pedestrian information and vehicle information can be used only when pedestrians and vehicles are in the dangerous area by setting the dangerous area inside the circuit breaker as a dangerous area and setting the dangerous area to be narrower than the target area. Is notified to the in-vehicle terminal device 3 of the train, an unnecessary warning can be avoided.

  In the present embodiment, the in-vehicle terminal device 3 is mounted on the train, and necessary information is transmitted and received between the in-vehicle terminal device 3 of the train and the in-vehicle terminal device 3 that is the representative terminal by inter-vehicle communication. However, as described above, the in-vehicle terminal device 3 of the vehicle that has become the representative terminal is regarded as a pedestrian, and the in-vehicle terminal device 3 that has become the representative terminal is connected to the in-vehicle terminal device 3 of the train. Communication may be performed. In addition, the in-vehicle terminal device 3 serving as the representative terminal communicates with a communication device installed in the vicinity of the railroad crossing, and communicates with the train via a communication system connected to the communication device. May be. For example, the in-vehicle terminal device 3 that has become a representative terminal performs road-to-vehicle communication with a roadside device installed on a road, and communicates with a train via a communication system connected to the roadside device. Also good.

  Here, there may be a case where there is no vehicle around the railroad crossing. In that case, the in-vehicle terminal device 3 mounted on a bicycle, a senior car, an electric wheelchair, an agricultural machine, or the like can be set as a representative terminal. Needless to say. If there is no bicycle, senior car, electric wheelchair, agricultural machine, etc., the pedestrian terminal device 1 possessed by the pedestrian will be set as the representative terminal. The device 1, the pedestrian terminal device 1 etc. closest to the track can be set as the representative terminal.

(Fifth embodiment)
Next, a fifth embodiment will be described. Note that points not particularly mentioned here are the same as in the above embodiment. FIG. 13 is an explanatory diagram showing a communication status in the inter-pedestrian communication system according to the fifth embodiment.

  In this embodiment, the disaster occurrence area is the target area, and the in-vehicle terminal device 3 of the vehicle existing in the disaster occurrence area is the representative terminal. And the pedestrian terminal device 1 which exists in the predetermined range (group formation area) on the basis of the vehicle-mounted terminal device 3 used as the representative terminal forms the group which uses the vehicle-mounted terminal device 3 as a common representative terminal.

  Moreover, in this embodiment, the vehicle-mounted terminal device 3 is mounted in the rescue helicopter which performs a rescue operation in a disaster occurrence area, and this vehicle-mounted terminal device 3 is the pedestrian information (the pedestrian information which the representative terminal acquired from the pedestrian terminal device 1 ( Location information). In addition, rescue vehicle information such as rescue helicopter position information is provided from the in-vehicle terminal device 3 of the rescue helicopter to the pedestrian terminal device 1 via the in-vehicle terminal device 3 serving as the representative terminal.

  Specifically, in the pedestrian terminal device 1 in the group, the pedestrian information (position information and the like) is transmitted to the in-vehicle terminal device 3 serving as the representative terminal by low power communication. When receiving the pedestrian information from the pedestrian terminal device 1, the in-vehicle terminal device 3 serving as the representative terminal transmits the pedestrian information to the in-vehicle terminal device 3 of the rescue helicopter through inter-vehicle communication. Thereby, a rescue worker can grasp the position of the person existing in the disaster occurrence area.

  Moreover, in the vehicle-mounted terminal device 3 of the rescue helicopter, the mobile information for rescue (position information or the like) is transmitted to the vehicle-mounted terminal device 3 that has become the representative terminal by inter-vehicle communication. When the in-vehicle terminal device 3 that has become the representative terminal receives the rescue moving body information from the in-vehicle terminal device 3 of the rescue helicopter, the rescue mobile body information is transmitted to the pedestrian terminal devices 1 in the group by low-power communication. To do. Thereby, the person in the disaster occurrence area can grasp the position of the rescue helicopter.

  Moreover, in this embodiment, in the pedestrian terminal device 1, a rescue request is input by a person who seeks rescue, and a rescue request notification is sent from the pedestrian terminal device 1 to the in-vehicle terminal device 3 that has become the representative terminal. Further, the pedestrian information and the rescue request notification are transmitted from the representative in-vehicle terminal device 3 to the in-vehicle terminal device 3 of the rescue helicopter. As a result, the rescue team member can grasp where the person seeking the rescue is.

  Then, in the in-vehicle terminal device 3 of the rescue helicopter, a response to the rescue request is input by the rescue team member, and the rescue request response notification is sent from the in-vehicle terminal device 3 of the rescue helicopter together with the rescue vehicle information to the representative terminal. 3, and the rescue mobile body information and the rescue request response notification are transmitted from the in-vehicle terminal device 3 serving as the representative terminal to the pedestrian terminal device 1. Thereby, the person who asks for a rescue can grasp that the rescue request has arrived.

  Further, the procedure of processing performed in the in-vehicle terminal device 3 in the present embodiment is substantially the same as the example shown in FIG. 5, but particularly in this embodiment, ETWS (Earthquake and Tsunami alarm distribution system: Earthquake and Tsunami The representative terminal transition condition is that emergency information is received by an emergency information distribution system such as Warning System) and the vehicle traveling speed is kept below a predetermined speed for a predetermined time or longer. When the condition is satisfied (Yes in ST102 in FIG. 5), the mobile terminal shifts to the representative terminal mode.

  Here, the emergency information is simultaneously distributed to the in-vehicle terminal device 3 and the pedestrian terminal device 1 in the disaster occurrence area, and since the emergency information distribution area is limited to the disaster occurrence area, the in-vehicle terminal apparatus 3 receives the emergency information. Receiving indicates that the in-vehicle terminal device 3 exists in the disaster occurrence area as the target area.

  Further, in this embodiment, the representative terminal release condition is that the remaining amount of the battery 37 mounted on the vehicle is equal to or less than a predetermined value, and that the vehicle has moved out of the disaster occurrence area as the target area. When at least one of the terminal cancellation conditions is satisfied (Yes in ST109 in FIG. 5), the representative terminal mode is canceled and the normal mode is restored.

  Similarly to the example shown in FIG. 5, the traveling speed has exceeded a predetermined speed, the state of not receiving the state notification signal from the pedestrian terminal has continued for a predetermined time, and the transition to the representative terminal When a predetermined time (for example, several hours) elapses from the representative terminal release condition, the representative terminal mode is released when at least one of the representative terminal release conditions is satisfied.

  In the disaster occurrence area, the number of pedestrians and vehicles on the road increases, and the possibility of an accident occurring increases. Therefore, the disaster occurrence area can be considered as a dangerous area. The target area matches.

  As described above, in this embodiment, when a vehicle exists in the disaster occurrence area with the disaster occurrence area as a target area, the in-vehicle terminal device 3 mounted on the vehicle becomes the representative terminal. As a result, communication congestion in the disaster occurrence area can be reduced, and traffic accidents in the disaster occurrence area can be reliably reduced. In particular, in a disaster occurrence area, it is assumed that communication traffic frequently occurs due to an increase in communication traffic due to an increase in pedestrians and vehicles on the road. Therefore, it is possible to reduce communication congestion in a disaster occurrence area.

  Moreover, in this embodiment, since the pedestrian terminal device 1 transmits / receives required information by low power communication, the power saving of the pedestrian terminal device 1 can be achieved. In particular, in a disaster occurrence area, it is assumed that the state where the pedestrian terminal device 1 cannot be charged continues for a long time, but the pedestrian terminal device 1 is charged due to power saving of the pedestrian terminal device 1. Can be used for a long time without any problems.

  In the present embodiment, a rescue request notification is transmitted to the in-vehicle terminal device 3 of the rescue helicopter together with the pedestrian information related to the person seeking rescue in the disaster occurrence area, and the rescue helicopter can request rescue. And since this rescue request is performed via the vehicle-mounted terminal device 3 which became a representative terminal, the congestion of the communication regarding a rescue request can be reduced and the inconvenience that a rescue request cannot reach can be avoided.

  In the present embodiment, the in-vehicle terminal device 3 is mounted on the rescue helicopter, and the in-vehicle terminal device 3 that is a representative terminal with the in-vehicle terminal device 3 performs inter-vehicle communication. The in-vehicle terminal device 3 that is the partner of the inter-vehicle communication is not limited to the one installed in the rescue helicopter, but is used for rescue activities in disaster-affected areas such as rescue robots, rescue vehicles, and small airplanes such as drones. It is good also as what was mounted in the various mobile body for rescue. In addition, communication between the in-vehicle terminal device 3 serving as a representative terminal and the rescue moving body is not limited to inter-vehicle communication, and various communication methods can be employed.

(Sixth embodiment)
Next, a sixth embodiment will be described. Note that points not particularly mentioned here are the same as in the above embodiment. FIG. 14 is an explanatory diagram showing a communication status in the inter-vehicle communication system according to the sixth embodiment.

  In the present embodiment, a target area is set around a bus stop (boarding area), and when a bus (passenger vehicle) enters the target area, the in-vehicle terminal device 3 mounted on the bus becomes the representative terminal. And the pedestrian terminal device 1 which exists in the predetermined range from the in-vehicle terminal device 3 of the bus that became the representative terminal forms a group in which the in-vehicle terminal device 3 of the bus is a common representative terminal.

  The pedestrian terminal device 1 in the group transmits pedestrian information (position information and the like) to the in-vehicle terminal device 3 on the bus by low power communication. When the in-vehicle terminal device 3 of the bus receives the pedestrian information from the pedestrian terminal device 1, the pedestrian information and the vehicle information (position information, etc.) of the own vehicle (bus) are transferred to the surrounding in-vehicle terminal device 3. Send by inter-vehicle communication. Also, in the in-vehicle terminal device 3 of the bus, when vehicle information (position information, etc.) is received from the surrounding in-vehicle terminal device 3 by inter-vehicle communication, the vehicle information and its own vehicle information are transmitted to the pedestrian terminal device in the group. 1 is transmitted by low power communication.

  In this way, the pedestrian information is notified to the surrounding in-vehicle terminal device 3. And based on pedestrian information, the safety of a pedestrian can be ensured around a bus stop by alerting the driver of a vehicle as needed. In addition, if there are vehicles parked around the bus stop, it will interfere with the bus stopping at the bus stop, but based on the vehicle information of the bus, it can be said that the bus has come close to the bus stop. By notifying the driver, the driver of the surrounding vehicle can be urged not to stop around the bus stop.

  Although it is conceivable that a person enters the roadway (dangerous area) when getting on the bus, in this case, unnecessary alerting may not be performed. That is, even if it is detected that the pedestrian has entered the roadway based on the position information of the bus and the pedestrian, if the pedestrian is located on the roadway between the bus and the sidewalk, an alert is issued. Do not.

  Further, the procedure of processing performed in the in-vehicle terminal device 3 of the bus in the present embodiment is substantially the same as the example shown in FIG. 5, but in this embodiment, in particular, the bus approaches a bus stop. The representative terminal transition condition is that the bus has entered the target area set within a predetermined range from the bus stop (boarding area). When the representative terminal transition condition is satisfied (Yes in ST102 in FIG. 5), the representative terminal mode is set. Migrate to

  In the present embodiment, the representative terminal release condition is that the bus leaves the bus stop, specifically, the bus has moved out of the target area, and the representative terminal release condition is satisfied (in ST109 of FIG. 5). Yes), the representative terminal mode is canceled and the normal mode is restored.

  Similarly to the example shown in FIG. 5, the traveling speed has exceeded a predetermined speed, the state of not receiving the state notification signal from the pedestrian terminal has continued for a predetermined time, and the transition to the representative terminal The representative terminal mode is canceled when a predetermined time elapses from when the representative terminal transition condition is satisfied, and when at least one of these representative terminal cancellation conditions is satisfied.

  Further, when a pedestrian gets on the bus, it is not necessary to notify pedestrian information about the person to the in-vehicle terminal device 3 of the surrounding vehicle. Therefore, in the present embodiment, the pedestrian information of the person who got on the bus is excluded in the process of transmitting the pedestrian information to the in-vehicle terminal device 3 of the surrounding vehicle (ST106 in FIG. 5). Further, when a pedestrian gets on the bus, it is not necessary to notify the person of vehicle information related to surrounding vehicles. Therefore, in the present embodiment, in the process of transmitting vehicle information to surrounding pedestrian terminal devices 1 (ST107 in FIG. 5), the pedestrian terminal device 1 of the person who gets on the bus is excluded from the notification target.

  Specifically, the pedestrian terminal device 1 detects that a person who owns the device has got on the bus based on the pedestrian and bus position information. When it is detected that the user has boarded the bus, a bus boarding notification is transmitted to the in-vehicle terminal device 3 of the bus by low power communication. When receiving the bus boarding notification from the pedestrian terminal device 1, the in-vehicle terminal device 3 for the bus transmits the pedestrian information excluding the pedestrian terminal device 1 and its own vehicle information to the other in-vehicle terminal device 3, and The vehicle information related to other vehicles is transmitted to the pedestrian terminal device 1 excluding the pedestrian terminal device 1 of the person on the bus.

  The procedure of the process performed by the pedestrian terminal device 1 in the present embodiment is substantially the same as the example shown in FIG. 6, but as described above, it is detected that the pedestrian has boarded the bus, The process of transmitting the notification to the in-vehicle terminal device 3 on the bus by low power communication is performed at an appropriate timing.

  As described above, in this embodiment, when the target area is set around the bus stop and the bus enters the target area, the in-vehicle terminal device 3 mounted on the bus is a pedestrian existing around the bus stop. It becomes a representative terminal of the terminal device 1. As a result, communication congestion around the bus stop can be reduced, and traffic accidents around the bus stop can be reliably reduced. Moreover, since the pedestrian information and vehicle information are transmitted / received excluding the pedestrian terminal device 1 of the person who got on the bus, an increase in the amount of communication due to unnecessary communication can be avoided.

  In this embodiment, the roadway facing the bus stop (getting on / off area) may be a dangerous area, and the target area may be set so as to coincide with the dangerous area. When the bus enters, the in-vehicle terminal device 3 of the bus may be transferred to the representative terminal, and pedestrian information may be notified only for pedestrians existing in the danger area.

  Moreover, although this embodiment demonstrated the example in which the vehicle-mounted terminal device 3 mounted in the bus | bath became a representative terminal, the vehicle-mounted terminal mounted in the taxi (passenger vehicle) instead of the vehicle-mounted terminal device 3 mounted in the bus | bath. The device 3 can also be a representative terminal. In this case, the target area is set around the taxi stand (boarding area). The operations of the taxi in-vehicle terminal device 3 and the pedestrian terminal device 1 are the same as those in the case where the bus in-vehicle terminal device 3 becomes a representative terminal.

  In addition, when the in-vehicle terminal device 3 mounted on a bus or taxi is set as a representative terminal, there is a new effect that the following unprecedented service can be made possible.

  For example, information on whether an elderly person or a handicapped person gets on a bus and information on from which bus stop the bus information is sent to the bus in advance along with the location information. It is also possible to secure priority seats and the like for the handicapped person in advance. Here, LED lights etc. are installed on the bus floor, etc., and the LED lights etc. installed in the flow line from the bus entrance to the priority seat are turned on, and a service to guide to the priority seat is also possible It is. In this service, it is also possible to turn on an LED light or the like installed in the flow line from the priority seat to the exit of the bus to make it easier for elderly people and people with physical disabilities to get off.

  In addition, it is preferential to elderly people and people with physical disabilities by notifying the taxi in advance of the location information along with information that elderly people and people with physical disabilities take a taxi. It is also possible to assign a taxi.

  In addition, by setting the in-vehicle terminal device 3 mounted on a sightseeing bus or the like as a representative terminal and collecting passenger position information, it is also possible to confirm passenger boarding, where to find unoccupied passengers, etc. It becomes.

  As mentioned above, although this invention was demonstrated based on specific embodiment, these embodiment is an illustration to the last, Comprising: This invention is not limited by these embodiment. In addition, all the components of the in-vehicle terminal device, the pedestrian terminal device, the inter-pedestrian communication system, and the inter-pedestrian communication method according to the present invention described in the above embodiment are not necessarily essential, and at least within the scope of the present invention. As long as it does not deviate, it is possible to select appropriately.

  For example, in the above-described embodiment, the in-vehicle terminal device mounted on the vehicle is the representative terminal of the pedestrian terminal device existing in the vicinity thereof, but the vehicle on which the on-vehicle terminal device is mounted is generally a passenger car. In addition to simple vehicles, small vehicles such as senior cars (electric walking assistance vehicles), electric bicycles, and agricultural machines may be used. Since such a small vehicle is equipped with a battery having a larger capacity than a pedestrian terminal device, there is no significant influence from the viewpoint of power consumption. When such a small vehicle, a general vehicle such as a passenger car, and a large vehicle such as a bus or truck are mixed, priority is given to a large vehicle equipped with a large-capacity battery. To make it a representative terminal.

  Moreover, although the said embodiment demonstrated the example in which a pedestrian terminal device has the function of communication between pedestrians, it is also possible to use the pedestrian terminal device which does not have a function of communication between pedestrians. In other words, if the pedestrian terminal device has a function of low-power communication, it can communicate with the in-vehicle terminal device that has become the representative terminal, thereby via the in-vehicle terminal device that has become the representative terminal, Information exchanged by inter-vehicle communication or inter-vehicle communication can be used.

  An in-vehicle terminal device, a pedestrian terminal device, a communication system between pedestrians, and a communication method between pedestrians according to the present invention aim at power saving of the pedestrian terminal device and communication between the pedestrian terminal device and the in-vehicle terminal device. It has the effect of reducing traffic congestion by reducing the traffic of the vehicle, and it is installed in the vehicle and carries the inter-pedestrian communication with the pedestrian terminal device. The present invention is useful as a pedestrian terminal device that performs inter-pedestrian communication with an in-vehicle terminal device, an inter-pedestrian communication system that performs inter-pedal communication between the in-vehicle terminal device and the pedestrian terminal device, and an inter-pedal communication method.

DESCRIPTION OF SYMBOLS 1 Pedestrian terminal device 2 Portable information terminal device 3 Car-mounted terminal device 4 Car navigation apparatus 11 Position information acquisition part 12 Inter-walk communication part 13 Low power communication part 14 Input / output part 15 Control part 16 Battery 21 Communication control part 22 Communication information processing Unit 31 position information acquisition unit 32 inter-vehicle communication unit 33 low power communication unit 34 inter-vehicle communication unit 35 input / output unit 36 control unit 37 battery 41 communication control unit 42 communication information processing unit

Claims (18)

An in-vehicle terminal device that is mounted on a vehicle and performs inter-pedestrian communication with a pedestrian terminal device,
A step-to-step communication unit that performs the step-to-step communication;
A low power communication unit for performing low power communication;
A communication control unit that switches between two operation modes of a normal mode and a representative terminal mode;
With
In the normal mode, pedestrian information and vehicle information are mutually exchanged by the inter-pedestrian communication with the pedestrian terminal device,
In the representative terminal mode, pedestrian information is acquired from the pedestrian terminal device by the low-power communication as a representative terminal of the pedestrian terminal device existing around the own device, and the pedestrian information is transferred to another vehicle A vehicle-mounted terminal device provided to a terminal device and providing vehicle information acquired from another vehicle-mounted terminal device to the pedestrian terminal device through the low-power communication.   The in-vehicle terminal device according to claim 1, wherein the communication control unit spontaneously shifts to a representative terminal mode when the host vehicle enters a state that satisfies a predetermined representative terminal transition condition.   When the communication control unit receives a representative terminal transition request transmitted from the other in-vehicle terminal device by determining that the host vehicle is in a state that satisfies a predetermined representative terminal transition condition in the other in-vehicle terminal device, The in-vehicle terminal device according to claim 1, wherein the in-vehicle terminal device shifts to the representative terminal mode. The in-vehicle terminal device according to claim 2, wherein the representative terminal transition condition is that a state where the traveling speed of the vehicle is equal to or lower than a predetermined speed is continued for a predetermined time or more. The in-vehicle terminal device according to claim 2 or 3 , wherein the representative terminal transition condition is that a vehicle exists in a predetermined target area set to include a dangerous area.   The in-vehicle terminal device according to claim 5, wherein the target area is around an accident-prone area as the danger area.   The in-vehicle terminal device according to claim 5, wherein the target area is around a railroad crossing as the danger area.   The in-vehicle terminal device according to claim 5, wherein the target area is a disaster occurrence area as the danger area.   The in-vehicle terminal device according to claim 5, wherein the target area is a periphery of a passenger vehicle getting-on / off area as the danger area.   The in-vehicle terminal according to any one of claims 1 to 9, wherein the communication control unit voluntarily releases the representative terminal mode when the host vehicle enters a state that satisfies a predetermined representative terminal release condition. apparatus.   The in-vehicle terminal device according to claim 10, wherein the representative terminal release condition is that a traveling speed of the vehicle exceeds a predetermined speed.   The in-vehicle terminal device according to claim 10, wherein the representative terminal release condition is that a state in which a signal from the pedestrian terminal device is not received continues for a predetermined time or more.   The in-vehicle terminal device according to claim 10, wherein the representative terminal release condition is that a predetermined time has elapsed since the transition to the representative terminal mode. A pedestrian terminal device possessed by a pedestrian and performing inter-vehicle communication with an in-vehicle terminal device,
A step-to-step communication unit that performs the step-to-step communication;
A low power communication unit for performing low power communication;
A communication control unit that switches between two operation modes of a normal mode and an in-group terminal mode;
With
In the normal mode, pedestrian information and vehicle information are exchanged with each other by the inter-walk communication with the in-vehicle terminal device,
In the intra-group terminal mode, pedestrian information is provided by the low-power communication to the in-vehicle terminal device that has become a representative terminal that exists in the vicinity of the own device, and other in the in-vehicle terminal device that has become the representative terminal The pedestrian terminal device characterized by acquiring the vehicle information acquired from the vehicle-mounted terminal device from the vehicle-mounted terminal device that has become the representative terminal by the low-power communication.   The pedestrian terminal device according to claim 14, wherein the communication control unit stops the operation of the inter-pedestrian communication unit when the mode is shifted to the intra-group terminal mode. An inter-pedestrian communication system comprising an in-vehicle terminal device mounted on a vehicle and a pedestrian terminal device possessed by a pedestrian, and performing inter-pedal communication between the in-vehicle terminal device and the pedestrian terminal device. ,
The in-vehicle terminal device is
A step-to-step communication unit that performs the step-to-step communication;
A low power communication unit for performing low power communication;
A communication control unit that switches between two operation modes of a normal mode and a representative terminal mode;
With
The pedestrian terminal device
A step-to-step communication unit that performs the step-to-step communication;
A low power communication unit for performing low power communication;
A communication control unit that switches between two operation modes of a normal mode and an in-group terminal mode;
With
When the in-vehicle terminal device and the pedestrian terminal device are in a normal mode, pedestrian information and vehicle information are exchanged with each other by inter-walk communication between the in-vehicle terminal device and the pedestrian terminal device,
When the in-vehicle terminal device shifts to the representative terminal mode, and the pedestrian terminal device existing around the in-vehicle terminal device shifts to the intra-group terminal mode, the in-vehicle terminal device becomes the pedestrian terminal device in the group. As a representative terminal of the vehicle, the pedestrian information is acquired from the pedestrian terminal device by the low-power communication, the pedestrian information is provided to another in-vehicle terminal device, and the vehicle information acquired from the other in-vehicle terminal device Is provided to the pedestrian terminal device by the low-power communication. When the in-vehicle terminal device shifts to the representative terminal mode, it transmits a representative terminal notification,
The inter-pedal communication system according to claim 16, wherein the pedestrian terminal device shifts to the intra-group terminal mode when receiving the representative terminal notification. An inter-pedestrian communication method for performing inter-pedal communication between an in-vehicle terminal device mounted on a vehicle and a pedestrian terminal device possessed by a pedestrian,
When the in-vehicle terminal device and the pedestrian terminal device are in a normal mode, pedestrian information and vehicle information are exchanged with each other by inter-walk communication between the in-vehicle terminal device and the pedestrian terminal device,
When the in-vehicle terminal device shifts to the representative terminal mode, and the pedestrian terminal device existing around the in-vehicle terminal device shifts to the intra-group terminal mode, the in-vehicle terminal device becomes the pedestrian terminal device in the group. As the representative terminal, the pedestrian information is acquired from the pedestrian terminal device by low-power communication, the pedestrian information is provided to the other in-vehicle terminal device, and the vehicle information acquired from the other in-vehicle terminal device is An inter-pedestrian communication method characterized by providing to the pedestrian terminal device by the low power communication.

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