JP2008244928A - Vehicle to vehicle communication method and communications device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To perform vehicle to vehicle communication by limiting to the vehicle having a specified personal identification ID information. <P>SOLUTION: The communication method includes a step (a) in which a first communication device 500 that is an originator, transmits a communication start request signal (hereinafter, to be referred to as signal) that includes a first ID set to the communications device and a second ID set to a second communications device which is a destination; a step (b) in which, if a third communications device 700 which is not the destination receives the signal, the received second ID is compared with the third ID set to the third communications device 700, and the signal is transmitted after confirming there is no agreement; and a step (c) in which the step (b) is repeated, until the second communications device receives the signal, and when the second communications device receives the signal, the received second ID is compared with the second ID set to the second communications device, for confirming the agreement. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a vehicle-to-vehicle communication method and a communication device.

  First, an ETC system (automatic toll collection system) applied by the in-vehicle communication device of the present invention will be described. The ETC system is a wireless communication service system that is provided between a vehicle-mounted communication device installed in a vehicle using a DSRC (Dedicated Short Range Communication) communication method and a roadside communication device installed on the road. It is. (DSRC communication system standards include ARIB STD-T55, ARIB STD-T75, etc.) Among the services that make use of this wireless communication system are highway usage fee settlement and parking lots. There is a usage fee settlement, which is an automatic toll collection service that allows users to settle fees on a fixed settlement date instead of paying fees on the spot using cash.

  In such automatic fee collection service, a personal authentication system using an IC card is used as a method for managing fee collection. This is because an IC card (ETC card), in which a unique ID is assigned to each user in advance, is provided to the user, and the user inserts the card into the in-vehicle communication device. It is transmitted from the in-vehicle communication device to the ground roadside communication device. Only when the transmitted personal authentication ID information is personally authenticated with the management data of the base station and there is no problem, the user can receive the automatic fee collection service.

  In recent years, in order to further spread the users of the ETC system, various road-to-vehicle communication services using the same DSRC communication as the on-board device for ETC, and inter-vehicle communication services (services other than the automatic toll collection service. In this specification, “DSRC service” is introduced or studied.

  For example, in a DSRC service by road-to-vehicle communication, in a parking lot such as an SA (service area) or PA (parking area) such as an expressway or an automobile toll road, or a “road station” on a general road, or a large leisure facility, Many users, such as weekends and long holidays, are very crowded and it is difficult to park a car in the parking lot. DSRC services such as guidance to empty spaces in such crowded parking lots are provided.

  In addition, at the gas station, an ETC gate is installed near the gasoline refueling location, and not only the payment of the gasoline fee, but also the DSRC such as the music distribution service and traffic information distribution service according to the user's request while refueling Service is being considered.

  Also, in fast food drive-through, not only order acceptance and payment, but also delivery of content such as music and videos according to user requests, and route information to destinations (maps, optimal routes, traffic jams, etc.) ) And surrounding area information (weather, accommodations, restaurants, events, etc.) are being considered for DSRC services.

  In addition, at restaurants and movie theaters, DSRC services such as today's recommended menus, one-time movies, and announcements of the screening period are also expected at the entrance of the parking lot.

  In this way, the ETC system user can obtain useful information according to the place and purpose in a timely manner while riding the car. In the future, it is expected to develop services using DSRC in various fields for vehicles.

  As a system using DSRC in such a wide field as described above, for example, it is proposed on the homepage of the Ministry of Land, Infrastructure, Transport and Tourism Road Bureau ITS. Also, in Patent Document 1, a vehicle having a roadside communication device installed on the ground and specific personal authentication ID information by using personal authentication ID information for each user, which is used for settlement of charges of the ETC system. There is also a proposal to communicate with.

  Also, in the DSRC service based on inter-vehicle communication, in Patent Document 2, when a road suddenly becomes impossible due to a traffic accident or the like and a traffic jam occurs, the information on the accident is transmitted to the following vehicle from the leading vehicle in the traffic jam and the information is propagated. Proposals have been made.

JP 2000-183897 A JP 2000-149180 A

  However, the automatic toll collection service of the ETC system described above and the DSRC service proposed in Patent Document 1 are communication between roadside vehicles between a roadside communication device installed on the ground and an in-vehicle communication device installed on the vehicle. Met. Therefore, in order to acquire the information, the information cannot be received and viewed unless the user goes to the location of the roadside communication device installed in the parking lot, gas station, public facility or the like that provides the DSRC service. Therefore, the vehicle that wants to receive the information has to go to that place, which is not very convenient.

  In addition, the DSRC service proposed in Patent Document 2 described above distributes information unconditionally to all vehicles within the communicable range and propagates the information to many vehicles. It is intended for sending information, not for users to use to distribute personal information. In addition, such a service for communication between unknown vehicles may not always have a vehicle equipped with the same communication device around when you want to distribute information, and you will not be able to communicate as expected, and you can get the effect. There wasn't.

  In this way, the DSRC service proposed so far is a vehicle-to-vehicle communication system that handles road-to-vehicle communication where information can be obtained only at the location of the roadside communication device and public information that is distributed to unspecified majority. If the user distributes information only to a specific vehicle at an arbitrary location due to communication, it is distributed to an extra vehicle that does not want to send information in a location where there are many vehicles around. Therefore, there was a problem that it was necessary to select a location and send it.

  The present invention has been made in view of the above-described problems, and is limited to only a vehicle having a specific personal authentication ID information without a user selecting a place, and inter-vehicle communication. It is an object of the present invention to provide a vehicle-to-vehicle communication method and a vehicle-mounted communication device that can share information.

  In order to solve the above-described problem, in the inter-vehicle communication method of the present invention, the first communication device that is the transmission source includes the first personal authentication ID information set in the first communication device, and the transmission destination. And a step (a) of transmitting a communication start request signal including the second personal authentication ID information set in the second communication device, and the third communication device that is not the destination receives the communication start request signal If it is, the received second personal authentication ID information is compared with the third personal authentication ID information set in the third communication device, and after confirming that they do not match, a communication start request signal is transmitted. Step (b), repeating step (b) until the second communication device receives the communication start request signal, and when the second communication device receives the communication start request signal, the received second personal authentication ID information and the second set in the second communication device Comparing the personal authentication ID information, and includes a step (c) to verify that match.

  According to the vehicle-to-vehicle communication method of the present invention, transmission can be performed only to a vehicle having certain specific personal authentication ID information, and the transmission source is personally owned by the transmission source or related only to a certain specific vehicle. The information to be transmitted can be reliably transmitted to the transmission destination.

  Hereinafter, the present invention will be specifically described with reference to the drawings showing embodiments thereof.

(Constitution)
First, the configuration of an in-vehicle communication device of an ETC system that is currently generally used will be described. FIG. 1 shows a configuration diagram thereof. The in-vehicle communication device includes a wireless unit 100 for performing wireless communication with a wireless unit (not shown) of the roadside communication device, transmission data received from the wireless unit 100, and transmission for transmission from the wireless unit 100. A communication control unit 200 that processes data is included. In addition, a voice output device 301 and a display device 302 that notify received data processed by the communication control unit 200 by voice and characters, an external IF unit 300 including an IC card reader 303 for personally identifying a user, The power supply unit 400 supplies power to these devices.

  As for the radio unit 100, an antenna 101 that performs radio communication with a ground roadside communication device, and a transmission unit 102 that is connected to the antenna 101 and the communication control unit 200 and transmits transmission data provided from the communication control unit 200. And a receiving unit 103 that is connected to the antenna 101 and the communication control unit 200 and supplies the reception data received from the antenna 101 to the communication control unit 200. The transmission unit 102 encodes and modulates transmission data (personal authentication ID information recorded on the IC card) transmitted from the communication control unit 200. The receiving unit 103 modulates / demodulates the received data received from the antenna 101, decodes it, and performs decoding processing.

  The communication control unit 200 is connected to the transmission unit 102, the reception unit 103, and the CPU 203 in the wireless unit 100, and is transmitted to the transmission unit 102 (personal authentication ID information recorded on the IC card), the reception unit A communication-dedicated IC 201 is provided to control delivery of received data received from 103. Further, it has a reception data storage unit 202 that is connected to the CPU 203 and stores reception data received from the wireless unit 100. The received data received from the radio unit 100 includes the amount of the fee used at that time, DSRC service information performed in road-to-vehicle communication, and the like.

  The CPU 203 is connected to the dedicated communication IC 201, the received data storage unit 202, the D / A conversion unit 204, and the external IF unit 300, and mainly performs interface control with the outside. Specifically, the reception data stored in the reception data storage unit 202 is passed to the external IF unit 300 as digital data or analog data obtained by analog conversion by the D / A conversion unit 204, or the external IF unit 300 The ID for personal authentication sent from the IC card reader 303 is received and passed to the communication dedicated IC 201. The D / A conversion unit 204 described above is connected to the CPU 203 and the external IF unit 300.

The external IF unit 300 includes an audio output device 301 that is connected to the D / A conversion unit 204 in the communication control unit 200 and performs audio notification from analog audio data sent from the D / A conversion unit 204. As the audio output device 301, a speaker, an earphone or the like is used. In addition, the display device 302 is connected to the CPU 203 in the communication control unit 200 and performs visual notification using characters, graphics, and the like from digital video data. A liquid crystal monitor or the like is used as the display device 302. Also, an IC card reader 303 is connected to the CPU 203 in the communication control unit 200 and reads the personal authentication ID recorded on the IC card 10 and passes it to the CPU 203. Until the ID read by the IC card reader 303 is personally authenticated as a user of the ETC service by the roadside communication device installed on the ground, the automatic toll collection service cannot be received.

  The power supply unit 400 includes an in-vehicle battery or a battery 401 dedicated to a communication device, and supplies power to all the blocks of the wireless unit 100, the communication control unit 200, and the external IF unit 300. The power supply unit 400 is linked to ON / OFF of the car engine, and the power supply unit 400 supplies power to the in-vehicle communication device only when the car engine is ON.

  The in-vehicle communication device of the present invention can be configured using, for example, an ETC in-vehicle communication device. Then, next, the configuration of the in-vehicle communication device to which the present invention is applied will be described focusing on differences from the above-described ETC in-vehicle communication device.

  FIG. 2 is a block diagram showing a configuration of the in-vehicle communication device according to the embodiment of the present invention.

  In FIG. 2, the in-vehicle communication device according to the present embodiment is used to perform road-to-vehicle communication with a radio unit (not shown) of the roadside communication device or to perform vehicle-to-vehicle communication with a specific vehicle. The wireless unit 100 includes a communication control unit 200 that processes reception data received from the wireless unit 100 and transmission data to be transmitted from the wireless unit 100. In addition, input of a specific ID when performing communication limited to a notification means of received data, an IC card reader for personal authentication, and a vehicle having a specific personal authentication ID. And an external IF unit 300 having input devices for transmission information and the like, and a power supply unit 400 for supplying power to these devices.

  For the radio unit 100, the antenna 101, the transmission unit 102, and the reception unit 103 are connected in the same manner as the ETC in-vehicle communication device described above. The antenna 101 may transmit and receive an ETC system automatic toll collection service of an ETC system that wirelessly communicates with a roadside communication device on the ground, or a vehicle-to-vehicle communication signal performed between vehicles equipped with the same vehicle-mounted communication device. Is possible. Both of these signals use the 5.8 GHz band used in the DSRC communication system, but they are used in different channels, and they do not collide with each other.

  Further, the transmission unit 102 performs encoding and modulation processing of transmission data transmitted from the communication processing control unit 200. The transmission data is the communication partner's personal authentication ID required when using the ETC service or the communication partner only when communicating with a vehicle having a specific personal authentication ID. This corresponds to the personal authentication ID and transmission data to be transmitted to the communication partner. The receiving unit 103 performs modulation / demodulation, decoding, decoding processing, and the like on the received data received from the antenna 101. The received data includes the amount of usage fee for the ETC service, transmission data transmitted by inter-vehicle communication, and the like.

  As for the communication control unit 200, a dedicated communication IC 201, a received data storage unit 202, a CPU 203, and a D / A conversion unit 204 are connected in the same manner as the ETC in-vehicle communication device described above.

  The information comparison unit 205, the transmission data storage unit 206, the vehicle state detection unit 208, the CPU 203 and the A / D conversion unit 207 connected to the external IF unit 300 are newly connected to the CPU 203.

  The dedicated communication IC 201 has a function of transmitting data to the transmitting unit 102 and received data received from the receiving unit 103 and a router function in the network, and confirms the personal authentication ID added to the received data. If the ID is its own ID, the data is taken in, but the received data that does not match is transferred to the next communication device. The received data whose personal authentication ID matches is temporarily stored in the received data storage unit 202.

  The reception data stored in the reception data storage unit 202 is stored in the information comparison unit 205 with the personal authentication ID of the transmission partner and the transmission time added. The information comparison unit 205 discards data that is determined to be duplicated in the transmission partner's personal authentication ID and transmission time. Further, the transmission data storage unit 202 is deleted in order from the old data when the capacity becomes full.

  The transmission data storage unit 206 is controlled so as to store the ID information of the communication partner input from the external IF unit 300 and the transmission data to be transmitted to the communication partner. When the capacity of the transmission data storage unit 206 becomes full, old data is deleted in order. The communication partner ID information set by the user and transmission data to be transmitted to the communication partner include an analog signal input means by voice input and a digital signal input means by key or button input. The A / D conversion unit 207 in FIG.

  The vehicle state detection unit 208 always detects the running state of the vehicle. This is a device that detects the vehicle state by any one or more signals such as a vehicle side brake signal, a shift lever parking signal, or a speedometer speed signal. When it is determined that the vehicle is stopped, the in-vehicle communication device operates.

  The CPU 203 mainly performs interface control with the outside, and the reception data stored in the reception data storage unit 202 is converted to digital data or analog data obtained by analog conversion by the D / A conversion unit 204 to the external IF unit 300. The personal authentication ID input from the IC card reader 303 of the external IF unit 300 is received and passed to the communication dedicated IC 201. In addition, control for saving ID information and transmission data of the communication partner at the time of vehicle-to-vehicle communication in the transmission data storage unit 206, or reading out transmission data stored in the transmission data storage unit 206, and a communication-dedicated IC Or give it to.

  As for the communication control unit 300, an audio output device 301, a display device 302, and an IC card reader 303 are connected in the same manner as the ETC in-vehicle communication device described above. In addition, a voice input device 304 newly connected to the A / D conversion unit 207 in the communication control unit 200 and a key input device 305 and an external device IF unit 306 connected to the CPU 203 in the communication control unit 200 are provided. .

  In the audio output device 301, notification of the audio of the analog audio data sent from the communication control unit 200 is performed. As the audio output device 301, a speaker, an earphone or the like is used. In addition, the display device 302 notifies the digital video data visually using characters, figures, or the like. A liquid crystal monitor or the like is used as the display device 302. Also, the IC card reader 303 reads the personal authentication ID recorded on the IC card from the IC card 10 owned by the user and passes it to the communication control unit 200. With the ID read by the IC card reader 303, it is possible to receive an automatic toll collection service with the roadside communication device and the vehicle-to-vehicle communication of the present invention.

  In addition, when the user performs limited communication only with a vehicle having a specific personal authentication ID, the ID information and transmission data of the communication partner are the voice input device 304, key input device 305, Alternatively, the data is input and taken in from an external device connected to the external device IF unit 306. For example, a microphone or the like is used for the voice input device 304, and a keyboard or a button switch is used for the key input device 305. The external device IF unit 306 is connected to a storage medium such as a USB or HDD in which music data or image data is stored. In the key input device 305, unnecessary data such as old data stored in the received data unit 202 or the transmission data storage unit 206 as well as the input operation of the ID information and transmission information of the communication partner described above. Can be specified and destroyed.

  The power supply unit 400 includes a battery 401 that is a vehicle battery or a battery prepared exclusively for a communication device, and supplies power to all the blocks of the radio unit 100, the communication control unit 200, and the external IF unit 300. Yes. Therefore, it is possible to supply power even when the vehicle engine is stopped, such as when parking in a parking lot, and even if the vehicle is turned off if the user has set communication in advance. Vehicle-to-vehicle communication can be performed automatically. Also, it has a function of automatically turning off the power if communication is not possible for a certain period.

  Next, an example of a state where the external IF unit 300 and the antenna unit 101 described above are actually attached to a vehicle is shown in FIG. The vehicle 20 represents a front vehicle equipped with the in-vehicle communication device of the first embodiment, and the vehicle 21 similarly represents a rear vehicle equipped with the in-vehicle communication device of the present embodiment, both of which are stopped. is there.

  Although the antenna unit 101 is installed on the ceiling of the vehicle, the antenna unit 101 may be installed anywhere as long as it does not significantly affect the radio wave environment. The display panel device 302, the IC card reader 303, the voice input device 304, and the key input device 305 are preferably installed near the driver's seat and placed at a convenient position where the driver can operate and view as much as possible. . The audio output device 301 may be installed anywhere as long as it can be heard by the driver sitting in the driver's seat. As shown in FIG. 3, information can be transmitted and received between vehicles by DSRC communication as long as the distance between the vehicles is within a range where DSRC communication is possible.

(Operation)
The vehicle-to-vehicle communication operation of the in-vehicle communication device of the present embodiment will be described.

  FIG. 4 shows a communication sequence performed for inter-vehicle communication between the in-vehicle communication device 500 (first communication device) and the in-vehicle communication device 600 (second communication device). For the sake of explanation, only the user operation units 504 and 604, the transmission data storage units 503 and 603, the reception data storage units 502 and 602, and the communication control units 501 and 601 are described. Regarding the relationship with FIG. 2 which is a configuration diagram of the in-vehicle communication device, the reception data storage units 502 and 602 in FIG. 4 correspond to the reception data storage unit 202 in FIG. 2, and the transmission data storage units 503 and 603 in FIG. Corresponds to the transmission data storage unit 206 of FIG. Also, the communication control units 501 and 601 in FIG. 4 correspond to portions of the communication control unit 200 in FIG. 2 excluding the reception data storage unit 202 and the transmission data storage unit 206, and the user operation units 504 and 604 in FIG. 2 corresponds to the external device connected to the voice input device 304, the key input device 305, or the external device IF unit 306 in FIG.

  First, by the user operation of the in-vehicle communication device 500, the personal authentication ID information of the communication partner set in the in-vehicle communication device 600 as the transmission destination and the self set in the in-vehicle communication device 500 as the transmission source The communication start request signal including the personal authentication ID information is transmitted to a local network formed by a plurality of in-vehicle communication devices or a target in-vehicle communication device 600.

  When the in-vehicle communication device 600 determines whether or not the transmission destination of the communication start request signal received by the communication control unit 601 is its own personal authentication ID information, and confirms that it is its own personal authentication ID information, It is transmitted to the in-vehicle communication device 500 as a transmission source. That is, the in-vehicle communication device 600 that is the transmission source starts communication by adding its own personal authentication ID information and its own unique encryption key to the in-vehicle communication device 500 having the personal authentication ID information of the transmission destination. Send a response signal.

  Upon receiving the communication start response signal from the in-vehicle communication device 600, the communication control unit 501 of the in-vehicle communication device 500 first has the personal authentication ID information of the transmission destination added to the communication start response signal as its own personal authentication ID information. If it is confirmed that it is the personal authentication ID information, it is transmitted to the in-vehicle communication device 600 as the transmission source. That is, the in-vehicle communication device 500 that is the transmission source reads out transmission data prepared in the transmission data storage unit 503. The read transmission data is subjected to encryption processing by the communication control unit 501 using the encryption key of the in-vehicle communication device 600 added to the communication start response signal, and the in-vehicle communication device of the destination personal authentication ID information It transmits to 600 as a data signal.

  The communication control unit 601 of the in-vehicle communication device 600 determines whether or not the transmission destination personal authentication ID information added to the received data signal is own personal authentication ID information, and determines that the personal authentication ID information is the own personal authentication ID information. If confirmed, the data signal is stored in the received data storage unit 602. When the saving to the reception data storage unit 602 is completed, a reception completion signal is transmitted from the communication control unit 601 of the in-vehicle communication device 600 to the in-vehicle communication device 500 having the personal authentication ID information of the transmission source. The in-vehicle communication device 500 receives this signal and recognizes that its own transmission data has been normally received by the in-vehicle communication device 600.

  FIG. 5 is a diagram illustrating a communication sequence performed for vehicle-to-vehicle communication between the in-vehicle communication device 500 that is the transmission source and the in-vehicle communication device 700 (third communication device) other than the transmission destination. As in FIG. 4, a communication start request signal to which personal authentication ID information of a communication partner as a transmission destination and own personal authentication ID information as a transmission source are first added by a user operation of a user of the in-vehicle communication device 500. Is transmitted to a local network formed by a plurality of in-vehicle communication devices. For the transmission data sent from the in-vehicle communication device 500, the communication control unit 701 of the in-vehicle communication device 700 determines whether or not the destination personal authentication ID information is own personal authentication ID information, and own personal authentication. If it is not ID information, the received data is directly transmitted to the outside, that is, to the next in-vehicle communication device.

  In this way, until the communication start request signal arrives at the destination vehicle that is the final destination, the comparison of the personal authentication ID information between the in-vehicle communication devices and other cases where it does not match Transmission to the in-vehicle communication device is performed by routing work. That is, it is repeated continuously.

(effect)
6 and 7 are diagrams for explaining a network for inter-vehicle communication by the in-vehicle communication device according to the present embodiment. FIG. 6 shows a state of a vehicle stopped due to traffic jam on an expressway or the like. The six vehicles, vehicles 60, 61, 62, 63, 64, and 65, are equipped with an in-vehicle communication device described in the present embodiment, and communication settings are always made in advance by user operations. It is assumed that communication is set to ON and a communication start request signal is constantly transmitted from the antenna of the radio unit of the vehicle.

  In this case, as shown in FIG. 6, the vehicles 60 to 65 form one local network and can communicate with the respective vehicles. Further, FIG. 6 shows six vehicles from vehicles 60 to 65, but when there are actually dozens or hundreds of vehicles, the local network becomes large, and many in-vehicle communication devices are connected to each other. Can share information.

  For example, when the users of the vehicle 65 and the vehicle 60 are acquaintances, a local network including other vehicles is constructed by the inter-vehicle communication described above, and the personal authentication ID information unique to each other is used. Communication is possible. With this vehicle-to-vehicle communication, it is possible to communicate even when entering the next service area or when leaving the next interchange without worrying about being heard by other vehicles.

  In addition, since vehicle-to-vehicle communication while running is limited by the vehicle state detection unit 208 mounted on each vehicle, it is possible to prevent traffic accidents that occur due to interference with ETC services that can be received without stopping and side-by-side driving. Considered to keep users safe.

  FIG. 7 shows a state where the vehicle is stopped at the parking lot at night. Since the power supply unit 400 in the in-vehicle communication device mounted on each vehicle can supply power even when the engine is stopped, even in such an unmanned state where the driver is turned off. If the communication setting by the vehicle user is set to always ON for communication in advance, the communication start request signal is always transmitted. Therefore, it is also possible to construct a local network among a plurality of communication devices and perform inter-vehicle communication with a vehicle having a specific ID at a remote location.

  As for the seven vehicles from vehicle 70 to vehicle 76 shown in FIG. 7, a local network in the parking lot is formed by vehicles that are stopped in a range where vehicle-to-vehicle communication is possible. For example, the user of the vehicle 70 and the vehicle 74 is acquainted, if set to send a request to advance either the vehicle, even in the state of unattended such engine is OFF, in-vehicle communication device Since the power is supplied, it is also possible to perform inter-vehicle communication with a vehicle having specific personal authentication ID information at a remote location via a route as shown in the figure.

  In this way, it is a vehicle of friends who are parked in a parking lot etc., for example, not using a memory medium etc. to manually capture the map information to the destination of the drive, music data, etc. Data can be sent only to a specific vehicle while in a car or unattended.

  Also, if there is no response to a communication start request signal transmitted for a certain period of time in an unattended state where there is no driver with the engine turned off, it is determined that there is no communication partner vehicle and the power supply is automatically turned off. It has a function, and it becomes possible to suppress battery consumption.

It is a block diagram which shows the structure of the conventional ETC vehicle-mounted communication apparatus. It is a block diagram which shows the structure of the vehicle-mounted communication apparatus of embodiment of this invention. It is a vehicle-mounted arrangement | positioning figure of the vehicle-mounted communication apparatus of embodiment of this invention. It is a communication sequence figure of the vehicle-mounted communication apparatus of embodiment of this invention. It is a communication sequence figure of the vehicle-mounted communication apparatus of embodiment of this invention. It is a figure which shows the local network at the time of traffic congestion of the vehicle-mounted communication apparatus of embodiment of this invention. It is a figure which shows the network structure in the parking lot at night of the vehicle-mounted communication apparatus of embodiment of this invention.

Explanation of symbols

  10 IC card, 20, 21, 60 to 65, 70 to 76 Vehicle, 100 wireless unit, 101 antenna, 102 transmitting unit, 103 receiving unit, 200 communication control unit, 201 communication dedicated IC, 202 received data storage unit, 203 CPU , 204 D / A conversion unit, 205 Information comparison unit, 206 Transmission data storage unit, 207 A / D conversion unit, 208 Vehicle state detection unit, 300 External IF unit, 301 Audio output device, 302 Display device, 303 IC card reader , 304 voice input device, 305 key input device, 306 external device IF unit, 400 power supply unit, 401 battery, 500, 600, 700 in-vehicle communication device, 501, 601, 701 communication control unit, 502, 602, 702 received data Storage unit, 503, 603, 703 Transmission data storage unit, 504, 604 704 user operation unit.

Claims (7)

A vehicle-to-vehicle communication method,
(A) The first communication device as the transmission source has the first personal authentication ID information set in the first communication device and the second individual set in the second communication device as the transmission destination. Transmitting a communication start request signal including authentication ID information;
(B) When the third communication device that is not the transmission destination receives the communication start request signal, the received second personal authentication ID information and the third individual set in the third communication device Comparing the authentication ID information and confirming that they do not match, and then transmitting the communication start request signal;
(C) The step (b) is repeated until the second communication device receives the communication start request signal, and when the second communication device receives the communication start request signal, the received second A vehicle-to-vehicle communication method comprising: comparing the personal authentication ID information of the second person and the second personal authentication ID information set in the second communication device to confirm that they match. The inter-vehicle communication method according to claim 1, wherein after the step (c),
(D) The second communication device that is the transmission source includes the second personal authentication ID information, the first personal authentication ID information that is set in the first communication device that is the transmission destination, and encryption. Transmitting a communication start response signal including a key;
(E) The vehicle-to-vehicle communication method further comprising: the first communication device receiving and confirming the communication start response signal in the same manner as in the steps (b) and (c). The inter-vehicle communication method according to claim 2, wherein after the step (e),
(F) The first communication device that is a transmission source includes the first personal authentication ID information, the second personal authentication ID information that is set in the second communication device that is a transmission destination, Transmitting a data signal including data encrypted with an encryption key;
(G) The vehicle-to-vehicle communication method, further comprising: the second communication device receiving and checking the data signal in the same manner as in the steps (b) and (c). The communication device has a function of operating only when the vehicle on which the communication device is mounted is stopped.
The inter-vehicle communication method according to any one of claims 1 to 3. The communication device has a function of performing an operation even when an engine of a vehicle on which the communication device is mounted is stopped.
The vehicle-to-vehicle communication method according to any one of claims 1 to 4. The communication device has a function of automatically turning off the power if communication is not possible for a certain period of time.
The inter-vehicle communication method according to any one of claims 1 to 5.   The communication apparatus used for the vehicle-to-vehicle communication method in any one of Claims 1 thru | or 6.

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