WO2018110323A1 - 路車間通信システム、路側通信装置、車載通信装置及び路車間通信方法 - Google Patents

路車間通信システム、路側通信装置、車載通信装置及び路車間通信方法 Download PDF

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Publication number
WO2018110323A1
WO2018110323A1 PCT/JP2017/043293 JP2017043293W WO2018110323A1 WO 2018110323 A1 WO2018110323 A1 WO 2018110323A1 JP 2017043293 W JP2017043293 W JP 2017043293W WO 2018110323 A1 WO2018110323 A1 WO 2018110323A1
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WO
WIPO (PCT)
Prior art keywords
vehicle
communication device
data
transmission
unit
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/JP2017/043293
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English (en)
French (fr)
Japanese (ja)
Inventor
靖弘 藪内
雄一 児玉
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Sumitomo Wiring Systems Ltd
AutoNetworks Technologies Ltd
Sumitomo Electric Industries Ltd
Original Assignee
Sumitomo Wiring Systems Ltd
AutoNetworks Technologies Ltd
Sumitomo Electric Industries Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Sumitomo Wiring Systems Ltd, AutoNetworks Technologies Ltd, Sumitomo Electric Industries Ltd filed Critical Sumitomo Wiring Systems Ltd
Priority to US16/469,505 priority Critical patent/US11223934B2/en
Publication of WO2018110323A1 publication Critical patent/WO2018110323A1/ja
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
    • H04W4/30—Services specially adapted for particular environments, situations or purposes
    • H04W4/40—Services specially adapted for particular environments, situations or purposes for vehicles, e.g. vehicle-to-pedestrians [V2P]
    • H04W4/48—Services specially adapted for particular environments, situations or purposes for vehicles, e.g. vehicle-to-pedestrians [V2P] for in-vehicle communication
    • G—PHYSICS
    • G08—SIGNALLING
    • G08G—TRAFFIC CONTROL SYSTEMS
    • G08G1/00—Traffic control systems for road vehicles
    • G08G1/09—Arrangements for giving variable traffic instructions
    • G08G1/0962—Arrangements for giving variable traffic instructions having an indicator mounted inside the vehicle, e.g. giving voice messages
    • G08G1/0967—Systems involving transmission of highway information, e.g. weather, speed limits
    • G08G1/096708—Systems involving transmission of highway information, e.g. weather, speed limits where the received information might be used to generate an automatic action on the vehicle control
    • G08G1/096716—Systems involving transmission of highway information, e.g. weather, speed limits where the received information might be used to generate an automatic action on the vehicle control where the received information does not generate an automatic action on the vehicle control
    • G—PHYSICS
    • G08—SIGNALLING
    • G08G—TRAFFIC CONTROL SYSTEMS
    • G08G1/00—Traffic control systems for road vehicles
    • G08G1/09—Arrangements for giving variable traffic instructions
    • G08G1/0962—Arrangements for giving variable traffic instructions having an indicator mounted inside the vehicle, e.g. giving voice messages
    • G08G1/0967—Systems involving transmission of highway information, e.g. weather, speed limits
    • G08G1/096708—Systems involving transmission of highway information, e.g. weather, speed limits where the received information might be used to generate an automatic action on the vehicle control
    • G08G1/096725—Systems involving transmission of highway information, e.g. weather, speed limits where the received information might be used to generate an automatic action on the vehicle control where the received information generates an automatic action on the vehicle control
    • G—PHYSICS
    • G08—SIGNALLING
    • G08G—TRAFFIC CONTROL SYSTEMS
    • G08G1/00—Traffic control systems for road vehicles
    • G08G1/09—Arrangements for giving variable traffic instructions
    • G08G1/0962—Arrangements for giving variable traffic instructions having an indicator mounted inside the vehicle, e.g. giving voice messages
    • G08G1/0967—Systems involving transmission of highway information, e.g. weather, speed limits
    • G08G1/096733—Systems involving transmission of highway information, e.g. weather, speed limits where a selection of the information might take place
    • G08G1/096758—Systems involving transmission of highway information, e.g. weather, speed limits where a selection of the information might take place where no selection takes place on the transmitted or the received information
    • G—PHYSICS
    • G08—SIGNALLING
    • G08G—TRAFFIC CONTROL SYSTEMS
    • G08G1/00—Traffic control systems for road vehicles
    • G08G1/09—Arrangements for giving variable traffic instructions
    • G08G1/0962—Arrangements for giving variable traffic instructions having an indicator mounted inside the vehicle, e.g. giving voice messages
    • G08G1/0967—Systems involving transmission of highway information, e.g. weather, speed limits
    • G08G1/096766—Systems involving transmission of highway information, e.g. weather, speed limits where the system is characterised by the origin of the information transmission
    • G08G1/096775—Systems involving transmission of highway information, e.g. weather, speed limits where the system is characterised by the origin of the information transmission where the origin of the information is a central station
    • G—PHYSICS
    • G08—SIGNALLING
    • G08G—TRAFFIC CONTROL SYSTEMS
    • G08G1/00—Traffic control systems for road vehicles
    • G08G1/09—Arrangements for giving variable traffic instructions
    • G08G1/0962—Arrangements for giving variable traffic instructions having an indicator mounted inside the vehicle, e.g. giving voice messages
    • G08G1/0967—Systems involving transmission of highway information, e.g. weather, speed limits
    • G08G1/096766—Systems involving transmission of highway information, e.g. weather, speed limits where the system is characterised by the origin of the information transmission
    • G08G1/096783—Systems involving transmission of highway information, e.g. weather, speed limits where the system is characterised by the origin of the information transmission where the origin of the information is a roadside individual element
    • G—PHYSICS
    • G08—SIGNALLING
    • G08G—TRAFFIC CONTROL SYSTEMS
    • G08G1/00—Traffic control systems for road vehicles
    • G08G1/123—Traffic control systems for road vehicles indicating the position of vehicles, e.g. scheduled vehicles; Managing passenger vehicles circulating according to a fixed timetable, e.g. buses, trains, trams
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L67/00—Network arrangements or protocols for supporting network services or applications
    • H04L67/01—Protocols
    • H04L67/12—Protocols specially adapted for proprietary or special-purpose networking environments, e.g. medical networks, sensor networks, networks in vehicles or remote metering networks
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L67/00—Network arrangements or protocols for supporting network services or applications
    • H04L67/50—Network services
    • H04L67/56—Provisioning of proxy services
    • H04L67/564—Enhancement of application control based on intercepted application data
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L67/00—Network arrangements or protocols for supporting network services or applications
    • H04L67/50—Network services
    • H04L67/60—Scheduling or organising the servicing of application requests, e.g. requests for application data transmissions using the analysis and optimisation of the required network resources
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L9/00—Cryptographic mechanisms or cryptographic arrangements for secret or secure communications; Network security protocols
    • H04L9/32—Cryptographic mechanisms or cryptographic arrangements for secret or secure communications; Network security protocols including means for verifying the identity or authority of a user of the system or for message authentication, e.g. authorization, entity authentication, data integrity or data verification, non-repudiation, key authentication or verification of credentials
    • H04L9/3263—Cryptographic mechanisms or cryptographic arrangements for secret or secure communications; Network security protocols including means for verifying the identity or authority of a user of the system or for message authentication, e.g. authorization, entity authentication, data integrity or data verification, non-repudiation, key authentication or verification of credentials involving certificates, e.g. public key certificate [PKC] or attribute certificate [AC]; Public key infrastructure [PKI] arrangements
    • H04L9/3268—Cryptographic mechanisms or cryptographic arrangements for secret or secure communications; Network security protocols including means for verifying the identity or authority of a user of the system or for message authentication, e.g. authorization, entity authentication, data integrity or data verification, non-repudiation, key authentication or verification of credentials involving certificates, e.g. public key certificate [PKC] or attribute certificate [AC]; Public key infrastructure [PKI] arrangements using certificate validation, registration, distribution or revocation, e.g. certificate revocation list [CRL]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
    • H04W4/30—Services specially adapted for particular environments, situations or purposes
    • H04W4/40—Services specially adapted for particular environments, situations or purposes for vehicles, e.g. vehicle-to-pedestrians [V2P]
    • H04W4/44—Services specially adapted for particular environments, situations or purposes for vehicles, e.g. vehicle-to-pedestrians [V2P] for communication between vehicles and infrastructures, e.g. vehicle-to-cloud [V2C] or vehicle-to-home [V2H]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L2209/00—Additional information or applications relating to cryptographic mechanisms or cryptographic arrangements for secret or secure communication H04L9/00
    • H04L2209/84—Vehicles

Definitions

  • the present invention relates to a road-to-vehicle communication system, a road-side communication apparatus, an in-vehicle communication apparatus, and a road-to-vehicle communication method in which a road-side communication apparatus installed on a road and an in-vehicle communication apparatus mounted on a vehicle communicate.
  • a road-to-vehicle communication system that provides various types of information by radio signals to a vehicle-mounted communication device mounted on a vehicle from a road-side communication device installed on the road has been put into practical use.
  • the information transmitted from the roadside communication device to the in-vehicle communication device can be information such as the lighting state of traffic lights and surrounding traffic information, for example.
  • processing such as alerting the driver of the vehicle or driving assistance control of the vehicle can be performed.
  • Patent Document 1 a user who intends to use a service device acquires a certificate from the service device with his / her mobile terminal, verifies the reliability of the acquired certificate, and sends the verification result to the mobile terminal as trust information.
  • the certificate verification system to be registered as is described.
  • this certificate verification system when the trust information is already registered in the portable terminal, it is determined that the service device can be trusted according to this information, and the service device can receive the service.
  • certificate information is transmitted and received between a service device and a user's mobile terminal by wireless communication.
  • This wireless communication is highly likely to be performed in a stable environment. Even if wireless communication fails, it is easy to perform re-communication.
  • the wireless communication performed between the roadside communication device and the vehicle-mounted communication device cannot always be performed in a stable environment, and it is difficult to perform recommunication after the vehicle has run away.
  • One roadside communication device needs to perform wireless communication with an in-vehicle communication device mounted on a plurality of vehicles traveling on the road. For example, when transmitting information such as lighting information of traffic lights and surrounding traffic information, the roadside communication device may transmit information to a plurality of in-vehicle communication devices all at once.
  • the roadside communication device may transmit information to a plurality of in-vehicle communication devices all at once.
  • the present invention has been made in view of such circumstances, and the object of the present invention is, for example, that roadside communication devices, such as electronic certificate information, need to transmit different information for each in-vehicle communication device.
  • An object of the present invention is to provide a road-to-vehicle communication system, a roadside communication device, an in-vehicle communication device, and a road-to-vehicle communication method that can suppress an increase in traffic.
  • the road-to-vehicle communication system is a road-to-vehicle communication system including an in-vehicle communication device mounted on a vehicle and a road-side communication device installed on the road, wherein the in-vehicle communication device stores vehicle information about the vehicle.
  • a vehicle information transmission unit for transmitting, the roadside communication device storing a plurality of data to be transmitted to the vehicle-mounted communication device, and vehicle information reception for receiving vehicle information transmitted from the vehicle-mounted communication device
  • a transmission data generation unit that combines a plurality of data stored in the storage unit to generate one transmission data, and transmits the data generated by the transmission data generation unit to the in-vehicle communication device
  • a transmission number adjusting unit that adjusts the number of data to be combined by the transmission data generation unit based on the vehicle information received by the vehicle information reception unit. That.
  • the vehicle information transmission unit transmits vehicle speed information of the vehicle
  • the coupling number adjustment unit has a vehicle speed of a vehicle on which an in-vehicle communication device as a data transmission destination is mounted.
  • the number of data to be combined is increased as the speed is low, and the number of data to be combined is decreased as the speed is high.
  • the road-to-vehicle communication system further includes a transmission frequency adjusting unit that adjusts a frequency at which the data transmitting unit transmits data to the in-vehicle communication device based on vehicle information received by the vehicle information receiving unit. It is characterized by that.
  • the vehicle information transmission unit transmits the position information of the vehicle
  • the transmission frequency adjustment unit is a distance to the vehicle on which the in-vehicle communication device of the data transmission destination is mounted.
  • the transmission frequency is increased as the distance is longer, and the transmission frequency is decreased as the distance is closer.
  • the vehicle information transmission unit transmits information related to the necessity of data transmitted by the roadside communication device
  • the coupling number adjustment unit or the transmission frequency adjustment unit includes: Adjustment is performed according to the necessity.
  • the road-to-vehicle communication system is a road-to-vehicle communication system comprising an in-vehicle communication device mounted on a vehicle and a road-side communication device installed on the road, wherein the in-vehicle communication device is a vehicle related to the vehicle.
  • a vehicle information transmission unit that transmits information, wherein the roadside communication device stores a plurality of data to be transmitted to the in-vehicle communication device, and a vehicle that receives vehicle information transmitted from the in-vehicle communication device
  • An information reception unit a transmission data generation unit that generates a single transmission data by combining a plurality of data stored in the storage unit, and data generated by the transmission data generation unit to the in-vehicle communication device
  • a transmission frequency adjustment unit configured to adjust a frequency at which the data transmission unit transmits data to the in-vehicle communication device based on vehicle information received by the vehicle information reception unit. Characterized in that it comprises a part.
  • the road-vehicle communication system is characterized in that the roadside communication device includes the coupling number adjusting unit.
  • the road-vehicle communication system is characterized in that the roadside communication device includes the transmission frequency adjusting unit.
  • the road-vehicle communication system further includes a server device that distributes a plurality of data to be transmitted to the in-vehicle communication device to the roadside communication device, and the server device includes the coupling number adjustment unit. It is characterized by.
  • the server device distributes data to the plurality of in-vehicle communication devices, and the coupling number adjustment unit adjusts the coupling number according to information related to the roadside communication device. It is characterized by doing.
  • the road-vehicle communication system further includes a server device that distributes a plurality of data to be transmitted to the in-vehicle communication device to the roadside communication device, and the server device includes the transmission frequency adjusting unit. It is characterized by.
  • the server device distributes data to the plurality of in-vehicle communication devices, and the transmission frequency adjusting unit adjusts the transmission frequency according to information related to the roadside communication device. It is characterized by doing.
  • the roadside communication device stores a plurality of data to be transmitted to the in-vehicle communication device in the roadside communication device that is installed on the road and communicates with the in-vehicle communication device mounted on the vehicle.
  • Data transmission unit that generates a single transmission data by combining a plurality of data stored in the storage unit, a vehicle information receiving unit that receives vehicle information transmitted from the in-vehicle communication device
  • a data transmission unit that transmits data generated by the transmission data generation unit to the in-vehicle communication device, and data that the transmission data generation unit combines based on vehicle information received by the vehicle information reception unit
  • a coupling number adjusting unit for adjusting the number.
  • the roadside communication device further includes a transmission frequency adjusting unit that adjusts the frequency at which the data transmitting unit transmits data to the in-vehicle communication device based on the vehicle information received by the vehicle information receiving unit. It is characterized by.
  • the vehicle-mounted communication device is mounted on a vehicle and transmits vehicle information related to the vehicle to the road-side communication device in a vehicle-mounted communication device that communicates with a road-side communication device installed on a road.
  • a vehicle information transmission unit that transmits vehicle speed information of the vehicle, position information of the vehicle, and / or information related to the necessity of data transmitted by the roadside communication device.
  • the road-to-vehicle communication method is a road-to-vehicle communication method in which predetermined data is transmitted from a road-side communication device installed on a road to an in-vehicle communication device mounted on a vehicle.
  • the roadside communication device stores a plurality of data to be transmitted to the in-vehicle communication device, and the roadside communication device combines the plurality of stored data for one transmission.
  • Generate data transmit the generated data to the in-vehicle communication device, and adjust the number of data to be combined by the roadside communication device based on the vehicle information received from the in-vehicle communication device when generating the transmission data It is characterized by doing.
  • the road-side communication device transmits data to the in-vehicle communication device based on vehicle information received by the in-vehicle communication device. It adjusts the frequency which transmits.
  • the vehicle-mounted communication apparatus mounted in the vehicle transmits the vehicle information which concerns on this vehicle to the roadside communication apparatus installed on the road.
  • the roadside communication device stores a plurality of data to be transmitted to the in-vehicle communication device, combines the plurality of stored data to generate transmission data, and transmits the generated transmission data to the in-vehicle communication device.
  • the roadside communication device adjusts the number of data to be combined as transmission data based on the vehicle information received from the in-vehicle communication device.
  • the number of data to be combined is large, it is possible to transmit a large amount of data at one time. However, since the data length of the transmission data becomes long, the possibility of transmission failure during transmission increases.
  • the number of data to be combined is small, transmission can be completed in a short time and transmission failure is unlikely to occur.
  • the amount of data to be transmitted at a time decreases, and the frequency of transmission increases.
  • whether or not the roadside communication device can stably perform, for example, wireless communication with the vehicle-mounted communication device based on the vehicle information received from the vehicle-mounted communication device. It is possible to adjust the number of data to be combined as transmission data based on the determination result.
  • the traveling speed (vehicle speed) of the vehicle is transmitted as vehicle information from the in-vehicle communication device to the roadside communication device.
  • vehicle speed is high, wireless communication between the roadside communication device and the in-vehicle communication device may not be performed stably. Therefore, the roadside communication apparatus adjusts the number of data to be combined so that the number of data to be combined is increased as the vehicle speed is low, and the data to be combined is decreased as the vehicle speed is high. Thereby, it can suppress that malfunctions, such as data transmission from a roadside communication apparatus to a vehicle-mounted communication apparatus fail in the middle, generate
  • the frequency of data transmission is adjusted based on the vehicle information received from the in-vehicle communication device. If the communication frequency for one in-vehicle communication device is increased, even if the data transmission fails, it can be retransmitted immediately, but the increase in communication volume may hinder the data transmission to other in-vehicle communication devices There is. Decreasing the frequency of communication with the in-vehicle communication device can suppress an increase in communication volume, but it takes time until retransmission is performed when data transmission fails.
  • the roadside communication device whether or not the roadside communication device can stably perform, for example, wireless communication with the vehicle-mounted communication device based on the vehicle information received from the vehicle-mounted communication device. And the data transmission frequency can be adjusted based on the determination result.
  • the vehicle position information is transmitted as vehicle information from the in-vehicle communication device to the roadside communication device.
  • the roadside communication apparatus adjusts the transmission frequency so that the transmission frequency increases as the distance to the vehicle increases and the transmission frequency decreases as the distance decreases. Thereby, before completing the transmission of all the data to be transmitted to the in-vehicle communication device, it is possible to prevent the roadside communication device from being in a state in which communication with the in-vehicle communication device is impossible.
  • information relating to the necessity of data transmitted by the roadside communication device is transmitted from the in-vehicle communication device to the roadside communication device.
  • the electronic certificate has an expiration date, and the electronic certificate held by the in-vehicle communication device has not yet expired When sufficient time remains, the necessity of transmitting the electronic certificate information from the roadside communication device to the in-vehicle communication device is low.
  • the in-vehicle communication device which needs more data by the in-vehicle communication device judging the necessity of data transmission by itself and informing the road-side communication device, and the road-side communication device adjusting the number of data coupling and transmission frequency accordingly.
  • the roadside communication device can transmit data.
  • the adjustment of the number of combined data and the adjustment of the data transmission frequency may be performed by a roadside communication device, or may be performed by a server device that is not a roadside communication device.
  • a server device that performs the adjustment process for example, a server device that generates data such as electronic certificate information and distributes the data to the roadside communication device can be employed.
  • the server device in the configuration in which the server device performs the adjustment process, the server device combines the data in consideration of the information related to the roadside communication device that is the data transmission source together with the vehicle information related to the data transmission destination vehicle.
  • the number is adjusted and / or the data transmission frequency is adjusted.
  • the server device adjusts the number of data coupling and / or according to this index.
  • the server device can be set as the structure which adjusts the transmission frequency of data.
  • the server device aggregates the success rate or failure rate of data transmission performed between the roadside communication device and the in-vehicle communication device, and the server device stores data according to the success rate or failure rate of each roadside communication device. It can be set as the structure which adjusts the adjustment of the number of coupling
  • data transmission to the in-vehicle communication device can be performed with the number of data couplings and the data transmission frequency more suitable for the roadside communication device.
  • the number of a plurality of data combined as transmission data to the in-vehicle communication device and / or the frequency of data transmission to the in-vehicle communication device is adjusted based on the vehicle information received from the in-vehicle communication device.
  • FIG. 6 is a block diagram illustrating a configuration of a certificate issuing server device according to Embodiment 2.
  • FIG. 10 is a schematic diagram for explaining an adjustment process according to the communication capability of a roadside communication device performed by a certificate issuing server device according to the second embodiment.
  • FIG. 1 is a schematic diagram showing a configuration of a road-vehicle communication system according to the present embodiment.
  • the in-vehicle communication device 10 mounted on the vehicle 1 communicates wirelessly with the roadside communication device 3 installed in the traffic light 2 on the road, so-called V2I (Vehicle to Infrastructure). ) Communication or road-to-vehicle communication.
  • the roadside communication device 3 broadcasts, for example, information such as the current lighting color of the traffic light 2 and the time until the next lighting color changes to one or a plurality of vehicles 1 existing in the vicinity. To do.
  • processing such as a message display for alerting the user or automatic vehicle speed reduction control.
  • the roadside communication device 3 can communicate with other devices via the network 4 such as the Internet. Thereby, the vehicle-mounted communication device 10 of the vehicle 1 can communicate with other devices installed outside the vehicle 1 via the roadside communication device 3. In the present embodiment, the roadside communication device 3 can communicate with the certificate issuing server device 5 via the network 4.
  • the in-vehicle communication device 10 When transmitting data to other devices by road-to-vehicle communication, the in-vehicle communication device 10 according to the present embodiment adds an electronic signature to the transmission data in order to prevent spoofing by a malicious third party or data falsification. Then send.
  • the device that has received the data determines the validity of the received data based on the electronic signature attached to the received data.
  • the communication system according to the present embodiment performs communication using a so-called public key encryption technique. For this reason, the in-vehicle communication device 10 has a secret key for encrypting data to be transmitted or a hash value of the data, and a public key for decrypting the encrypted data.
  • the in-vehicle communication device 10 receives an electronic signature including encrypted data encrypted with a secret key, a public key for decrypting the data, and certificate information that proves that the public key is valid. The data is sent to another device with the transmission data.
  • the certificate issuing server device 5 is a device that issues certificate information used when the in-vehicle communication device 10 communicates with another device.
  • the in-vehicle communication device 10 stores the certificate information issued by the certificate issuing server device 5 and uses the stored certificate information every time data is transmitted. However, an expiration date is set in the certificate information issued by the certificate issuing server device 5, and the in-vehicle communication device 10 authenticates the certificate issuing server device 5 before or after the expiration date. It is necessary to request certificate information issuance and obtain new certificate information.
  • the certificate information issuance request from the in-vehicle communication device 10 to the certificate issuing server device 5 and the transmission of the certificate information from the certificate issuing server device 5 to the in-vehicle communication device 10 are performed. Can be performed via the roadside communication device 3.
  • FIG. 2 is a block diagram showing the configuration of the in-vehicle communication device 10.
  • the in-vehicle communication device 10 mounted on the vehicle 1 includes a processing unit 11, a storage unit 12, an in-vehicle communication unit 13, a road-to-vehicle communication unit 14, a GPS (Global Positioning System) receiving unit 15, and the like.
  • the processing unit 11 is configured using an arithmetic processing device such as a CPU (Central Processing Unit) or an MPU (Micro-Processing Unit), and reads a program stored in the storage unit 12 or a ROM (Read Only Memory) (not shown). To execute various arithmetic processes related to communication.
  • a CPU Central Processing Unit
  • MPU Micro-Processing Unit
  • the storage unit 12 is configured using a nonvolatile memory element such as an EEPROM (ElectricallyrErasable Programmable Read Only Memory) or a flash memory.
  • the storage unit 12 stores, for example, a program executed by the processing unit 11 and various data used for processing of the processing unit 11.
  • the storage unit 12 stores certificate information 12a used for communication with other devices.
  • the certificate information 12a is certificate information issued by the certificate issuing server device 5, and is information that proves the validity of the public key owned by the in-vehicle communication device 10.
  • the in-vehicle communication unit 13 is connected to other in-vehicle devices (for example, a body ECU (Electronic Control Unit) or a car navigation system) mounted on the vehicle 1 via an in-vehicle network 1a such as a CAN (Controller Area Network) provided in the vehicle 1. Communication).
  • the in-vehicle communication unit 13 performs data transmission by converting the data for transmission given from the processing unit 11 into an electric signal and outputs it to the communication line constituting the in-vehicle network 1a, and samples the potential of the communication line.
  • the data is received by acquiring the received data, and the received data is given to the processing unit 11.
  • the road-vehicle communication unit 14 performs wireless communication with the roadside communication device 3 provided on the road.
  • the road-to-vehicle communication unit 14 transmits data to the roadside communication device 3 by outputting a signal obtained by modulating the transmission data given from the processing unit 11 from the antenna, and demodulates the signal received by the antenna.
  • the data from the roadside communication device 3 is received, and the received data is given to the processing unit 11.
  • the data transmitted by the road-vehicle communication unit 14 is attached with an electronic signature generated using the certificate information 12 a stored in the storage unit 12.
  • the GPS receiving unit 15 receives a radio signal transmitted by a GPS artificial satellite, and gives information included in the received signal to the processing unit 11.
  • the processing unit 11 can perform a process of calculating the position (latitude, longitude, etc.) of the vehicle 1 based on the information given from the GPS receiving unit 15.
  • the processing unit 11 of the in-vehicle communication device 10 executes the program stored in the storage unit 12 or the ROM, so that the vehicle information acquisition unit 21, the vehicle information transmission unit 22, the certificate information
  • the acquisition processing unit 23, the communication processing unit 24, and the like are realized as software functional blocks.
  • the vehicle information acquisition unit 21 acquires predetermined vehicle information to be transmitted to the roadside communication device 3 based on information obtained through communication in the vehicle 1 by the in-vehicle communication unit 13 and information obtained from the GPS reception unit 15. Perform the process.
  • the vehicle information acquisition unit 21 acquires information on the vehicle speed of the vehicle 1 through in-vehicle communication, and acquires information on the position of the vehicle 1 based on information from the GPS reception unit 15.
  • the vehicle information transmission unit 22 performs a process of transmitting the vehicle information acquired by the vehicle information acquisition unit 21 to the roadside communication device 3 by the road-to-vehicle communication unit 14. Acquisition of vehicle information by the vehicle information acquisition unit 21 and transmission of vehicle information by the vehicle information transmission unit 22 are performed at a predetermined cycle, for example, every second or every minute. The vehicle information transmission by the vehicle information transmission unit 22 is repeated at a predetermined cycle regardless of whether or not the roadside communication device 3 exists within the reach of the radio signal transmitted by the road-to-vehicle communication unit 14.
  • the communication processing unit 24 communicates with other devices in the vehicle 1 by the in-vehicle communication unit 13 and communicates with the roadside communication device 3 (other devices outside the vehicle via the road-to-vehicle communication unit 14). Communicate with.
  • the communication processing unit 24 When performing data transmission to another device, the communication processing unit 24 generates an electronic signature based on the certificate information 12a stored in the storage unit 12, and attaches the electronic signature to the data to be transmitted.
  • the communication processing unit 24 performs processing for determining the validity of the electronic signature included in the received data.
  • FIG. 3 is a block diagram showing the configuration of the roadside communication device 3.
  • the roadside communication device 3 includes a processing unit 31, a storage unit 32, a road-vehicle communication unit 33, a wide area communication unit 34, and the like.
  • the processing unit 31 is configured using an arithmetic processing device such as a CPU, and performs various arithmetic processes related to communication. For example, the processing unit 31 performs a process of acquiring information related to the lighting state of the traffic light 2, a process of acquiring traffic jam information of roads around the traffic signal 2, a process of simultaneously transmitting the acquired information to the vehicle 1, and the like. Further, in the roadside communication device 3 according to the present embodiment, processing for transmitting the certificate information issued by the certificate issuing server device 5 to the specific vehicle 1 is performed.
  • the storage unit 32 is configured using a storage device such as a DRAM (Dynamic Random Access Memory), a flash memory, or a hard disk.
  • the storage unit 32 temporarily stores data transmitted and received by the roadside communication device 3 such as data received from the vehicle 1 by the road-to-vehicle communication unit 33 and data received by the wide area communication unit 34 via the network 4.
  • the certificate information 32a received by the wide area communication unit 34 from the certificate issuing server device 5 is temporarily stored in the storage unit 32, and the certificate information 32a is stored in the storage unit 32. Read out and transmit to vehicle 1.
  • the road-vehicle communication unit 33 performs wireless communication with the in-vehicle communication device 10 mounted on the vehicle 1.
  • the road-to-vehicle communication unit 33 performs data transmission to the in-vehicle communication device 10 by outputting a signal obtained by modulating the transmission data provided from the processing unit 31 from the antenna, and demodulates the signal received by the antenna.
  • the data from the in-vehicle communication device 10 is received, and the received data is given to the processing unit 31.
  • the data received by the road-to-vehicle communication unit 33 from the vehicle 1 is attached with an electronic signature in each vehicle 1.
  • the roadside communication device 3 that has received the data determines the validity of the electronic signature included in the received data. Note that the roadside communication device 3 may also attach an electronic signature to data that the roadside communication device 3 transmits to the in-vehicle communication device 10.
  • the wide area communication unit 34 communicates with, for example, a server device operated by the traffic management center or the above-described certificate issuing server device 5 through the network 4 such as the Internet.
  • the wide area communication unit 34 transmits the data for transmission given from the processing unit 31 to a server device connected to the network 4, and receives data from the server device etc. and gives it to the processing unit 31.
  • the processing unit 31 of the roadside communication device 3 includes functions such as a vehicle information receiving unit 41, a transmission data generating unit 42, a data transmitting unit 43, a coupling number adjusting unit 44, and a transmission frequency adjusting unit 45. Blocks are provided.
  • the vehicle information receiving unit 41 receives the vehicle information such as the vehicle speed and the position transmitted by the in-vehicle communication device 10 of the vehicle 1 at the road-to-vehicle communication unit 33 and stores the received vehicle information in the storage unit 32. Since one roadside communication device 3 may receive vehicle information from a plurality of vehicles 1, the vehicle information receiving unit 41 uses the received vehicle information as, for example, a vehicle ID attached to the transmission source vehicle 1. And stored in the storage unit 32.
  • the vehicle information reception unit 41 updates the vehicle information by overwriting the vehicle information stored in the storage unit 32. Update to one. In addition, you may delete the vehicle information memorize
  • the transmission data generation unit 42 performs processing for combining one or a plurality of certificate information 32a stored in the storage unit 32 to generate one transmission data.
  • the certificate information that the certificate issuing server device 5 issues to one vehicle 1 is not limited to one at a time.
  • a plurality of certificate information is distributed from the certificate issuing server device 5 to the roadside communication device 3.
  • the received storage unit 32 of the roadside communication device 3 stores a plurality of pieces of certificate information 32 a for one vehicle 1.
  • the transmission data generation unit 42 selects and reads one or a plurality of certificate information 32a out of a plurality of certificate information 32a issued to the vehicle 1 to be transmitted, and reads the read certificate information 32a.
  • Transmission Data that is combined and further added with information such as a header and a footer is used as transmission data.
  • the header and footer attached to the transmission data for example, the ID of the vehicle 1 designating the transmission destination, the data length of the transmission data, the number of certificate information 32a included in the transmission data, and / or the transmission Information such as an electronic signature indicating that the trust data is valid may be included.
  • the data transmission unit 43 performs processing for transmitting the transmission data generated by the transmission data generation unit 42 to the in-vehicle communication device 10 of the vehicle 1 to be transmitted by the road-to-vehicle communication unit 33.
  • the in-vehicle communication device 10 of the vehicle 1 that has received this data normally receives the data.
  • a response indicating completion is returned to the roadside communication device 3.
  • the data transmission unit 43 of the roadside communication device 3 determines that the data transmission has failed when the response of the reception completion from the in-vehicle communication device 10 is not obtained, and retransmits the transmission data.
  • the transmission data generation unit 42 when it is not possible to transmit all the issued certificate information 32a in one data transmission to one vehicle, the transmission data generation unit 42 generates a plurality of transmission data, and the data transmission unit 43 A plurality of transmission data are sequentially transmitted. Retransmission of transmission data and sequential transmission of a plurality of transmission data by the data transmission unit 43 are performed at a predetermined frequency (cycle) determined for each vehicle 1.
  • the combined number adjustment unit 44 adjusts the number of certificate information 32a to be combined by generating how many pieces of certificate information 32a are combined by the transmission data generating unit 42, that is, combining the certificate information 32a combined with the transmission data. Perform the process.
  • the coupling number adjustment unit 44 reads the vehicle information of each vehicle 1 stored in the storage unit 32, determines the coupling number for each vehicle 1 according to the read vehicle information, and uses the determined coupling number as a transmission data generation unit. 42 is notified.
  • the transmission data generation unit 42 reads the certificate information 32a of the number of combinations determined by the combination number adjustment unit 44 from the storage unit 32, and generates the transmission data by combining the read certificate information 32a.
  • the transmission frequency adjustment unit 45 performs a process of adjusting the frequency at which the data transmission unit 43 retransmits transmission data and sequentially transmits a plurality of transmission data.
  • the transmission frequency adjustment unit 45 reads the vehicle information of each vehicle 1 stored in the storage unit 32, determines the transmission frequency for each vehicle 1 according to the read vehicle information, and sends the determined transmission frequency to the data transmission unit 43. Notice.
  • the data transmission unit 43 repeatedly performs retransmission of transmission data and sequential transmission of a plurality of transmission data at the transmission frequency determined by the transmission frequency adjustment unit 45.
  • FIGS. 4 to 6 are schematic diagrams for explaining an example of adjustment of the number of couplings and transmission frequency by the roadside communication device 3.
  • a range in which the roadside communication device 3 can perform wireless communication with the roadside communication device 3 as a center is indicated by a broken-line circle.
  • the vehicles 1A and 1B are provided with arrows (vectors) indicating the traveling direction and the vehicle speed. The direction of the arrow is the traveling direction, and the length of the arrow indicates the vehicle speed.
  • FIG. 5 shows a numerical example when the number of connections is adjusted in 10 steps
  • FIG. 6 shows a numerical example when the transmission frequency is adjusted in 5 steps.
  • the coupling number adjusting unit 44 of the roadside communication device 3 adjusts the coupling number of the certificate information 32a according to the vehicle speed of the vehicle 1.
  • the coupling number adjusting unit 44 increases the coupling number as the vehicle 1A has a lower vehicle speed, and decreases the coupling number as the vehicle 1B has a higher vehicle speed.
  • the combination number adjusting unit 44 sets the combination number for the vehicle 1 at 0 to 10 km / h to 10 and 10 to 10 Assume that the number of connections for the vehicle 1 at 20 km / h is 9, and the number of connections for the vehicle 1 that exceeds 90 km / h is 1.
  • the roadside communication device 3 can combine and transmit a large number of pieces of certificate information at a time when the vehicle 1 is capable of stably performing wireless communication with the in-vehicle communication device 10 when traveling at low speed.
  • the size of the transmission data can be reduced and reliable data transmission can be performed.
  • the coupling number adjustment unit 44 reduces the coupling number (for example, 1) regardless of the vehicle speed for the vehicle 1C whose distance from the roadside communication device 3 is a predetermined distance or more.
  • the predetermined distance at this time can be set to 90 m or more when the communicable range of the roadside communication device 3 is 100 m, for example.
  • the transmission frequency adjusting unit 45 adjusts the frequency of data transmission according to the distance from the roadside communication device 3 to the vehicle 1.
  • the transmission frequency adjusting unit 45 calculates the distance from the roadside communication device 3 to the vehicle 1 based on the position of each vehicle 1 obtained as the vehicle information and the position where the roadside communication device 3 is installed. For example, the transmission frequency adjusting unit 45 sets the data transmission frequency (transmission cycle) to 1000 ms when the distance to the vehicle is 0 to 20 m, sets the transmission cycle to 500 ms when the distance is 20 to 40 m,. Is exceeded, the transmission cycle is set to 10 ms. As a result, the roadside communication device 3 can perform reliable data transmission by increasing the transmission frequency for vehicles that are more likely to go out of the communicable range.
  • FIG. 7 is a block diagram showing the configuration of the certificate issuing server device 5.
  • the certificate issuing server device 5 includes a processing unit 61, a storage unit 62, a communication unit 63, and the like.
  • the processing unit 61 is configured using an arithmetic processing device such as a CPU, and performs various arithmetic processes related to creation of certificate information by executing a program stored in the storage unit 62.
  • the storage unit 62 is configured using a storage device such as a hard disk, for example, and stores a program executed by the processing unit 61 and various data necessary for processing of the processing unit 61.
  • the storage unit 62 stores certificate information 62a to be transmitted to the created vehicle 1.
  • the communication unit 63 communicates with the roadside communication device 3 via the network 4 such as the Internet.
  • the communication unit 63 transmits the data for transmission given from the processing unit 61 to the roadside communication device 3 connected to the network 4, and receives data from the roadside communication device 3 and gives it to the processing unit 61.
  • the processing unit 61 of the certificate issuing server device 5 executes a program stored in the storage unit 62, thereby executing a certificate information creation processing unit 61a, a certificate information distribution processing unit 61b, and the like. Is realized as a software-like functional block.
  • the certificate information creation processing unit 61a performs processing for creating certificate information in response to a request from the in-vehicle communication device 10.
  • the certificate information creation processing unit 61 a creates certificate information for the in-vehicle communication device 10 based on information such as a public key given together with the request from the in-vehicle communication device 10, and stores the created certificate information in the storage unit 62. To do.
  • the certificate information distribution processing unit 61b can read the certificate information 62a created by the certificate information creation processing unit 61a from the storage unit 62, and perform wireless communication with the vehicle 1 that requires the certificate information 62a. A process of transmitting the read certificate information 62a to the roadside communication device 3 is performed.
  • the in-vehicle communication device 10 mounted on the vehicle 1 transmits a radio signal to the roadside communication device 3 at a predetermined cycle when the expiration date of the certificate information owned by the vehicle 10 is approaching, and responds to whether there is a response to this Then, it is determined whether or not there is a roadside communication device 3 capable of communication.
  • the in-vehicle communication device 10 requests the certificate issuing server device 5 to issue certificate information via the roadside communication device 3.
  • the certificate issuing server device 5 that has received the request creates certificate information, but since the certificate issuing server device 5 receives certificate information issuing requests from a number of vehicles 1, the certificate is issued after receiving the request. For example, it takes about several minutes to several hours to complete the creation of information.
  • the in-vehicle communication device 10 of the vehicle 1 that has requested the issuance of the certificate information subsequently transmits a radio signal to the roadside communication device 3 at a predetermined cycle, and the roadside communication device 3 that can communicate according to the presence or absence of a response thereto Determine if it exists.
  • the in-vehicle communication device 10 makes an inquiry to the certificate issuing server device 5 via this roadside communication device 3 as to whether the creation of certificate information has been completed. .
  • the roadside communication device 3 used by the in-vehicle communication device 10 may be the same as or different from the roadside communication device 3 used when the issuance request is made.
  • the certificate issuing server device 5 Upon receiving the inquiry, the certificate issuing server device 5 responds that the certificate has not been created, and transmits the certificate information to the roadside communication device 3 if the creation has been completed. To do. As a result, the roadside communication device 3 receives one or more pieces of certificate information to be transmitted to the vehicle 1 from the certificate issuing server device 5, and determines the number of connections and the transmission frequency based on the vehicle information of the vehicle 1 as described above. The certificate information is transmitted to the in-vehicle communication device 10 of the vehicle 1 while adjusting.
  • the certificate issuing server device 5 receives the certificate information that has been transmitted. It can be erased from the storage unit 62.
  • the in-vehicle communication device 10 is connected to the certificate issuing server via another roadside communication device 3.
  • the certificate information is transmitted from the certificate issuing server device 5 to the in-vehicle communication device 10 via the roadside communication device 3 in the same procedure.
  • the in-vehicle communication device 10 of the vehicle 1 makes an inquiry as to whether the creation of certificate information has been completed via the roadside communication device 3, and the certificate issuing server device 5 responds to this inquiry.
  • a procedure after transmitting a plurality of created certificate information to the roadside communication device 3 and receiving the certificate information by the roadside communication device 3 will be described.
  • FIG. 8 is a flowchart showing a procedure of processing performed by the in-vehicle communication device 10.
  • the in-vehicle communication device 10 periodically transmits a radio signal to the roadside communication device 3.
  • the processing unit 11 of the in-vehicle communication device 10 determines whether it is time to transmit a radio signal to the roadside communication device 3 (step S1).
  • the vehicle information acquisition unit 21 of the processing unit 11 is the vehicle 1 obtained via the vehicle speed and the GPS reception unit 15 obtained via the in-vehicle communication unit 13.
  • Vehicle information such as the position of the vehicle is acquired (step S2).
  • the vehicle information transmission unit 22 of the processing unit 11 transmits the vehicle information acquired in step S2 to the roadside communication device 3 in the road-to-vehicle communication unit 14 (step S3), and returns the process to step S1.
  • the processing unit 11 determines whether or not the data transmitted from the roadside communication device 3 is received by the road-to-vehicle communication unit 14 (Ste S4). When data is not received (S4: NO), the processing unit 11 returns the process to step S1 and waits until the transmission timing is reached or data is received. When the data is received (S4: YES), the certificate information acquisition processing unit 23 of the processing unit 11 acquires the certificate information included in the received data (step S5), and stores the acquired certificate information in the storage unit 12. Store (step S6) and return to step S1.
  • FIG. 9 is a flowchart showing a procedure of processing performed by the roadside communication device 3.
  • the vehicle information receiving unit 41 of the processing unit 31 of the roadside communication device 3 determines whether or not the vehicle information from the in-vehicle communication device 10 is received by the road-to-vehicle communication unit 33 (step S11). .
  • the vehicle information receiving unit 41 stores the received vehicle information in the storage unit 32 (step S12).
  • the coupling number adjusting unit 44 of the processing unit 31 determines the number of certificate information to be included in the data to be transmitted to the in-vehicle communication device 10 based on the vehicle information stored in the storage unit 32, that is, the number of couplings (step). S13).
  • the transmission frequency adjusting unit 45 of the processing unit 31 determines a cycle for transmitting data including certificate information to the in-vehicle communication device 10, that is, a transmission frequency, based on the vehicle information stored in the storage unit 32 (step S14). ), The process returns to step S11.
  • the processing unit 31 determines whether it is time to transmit data including certificate information to the in-vehicle communication device 10 (step S15). ). This transmission timing is determined based on the transmission cycle determined by the transmission frequency adjusting unit 45 in step S14. When it is not a transmission timing (S15: NO), the process part 31 returns a process to step S11, and waits until it receives vehicle information or reaches the transmission timing of data. When the transmission timing is reached (S15: YES), the transmission data generation unit 42 of the processing unit 31 has the number of certificates determined in step S13 among the certificate information 32a stored in the storage unit 32. Information 32a is read (step S16).
  • the transmission data generation unit 42 combines the read certificate information 32a and loads information such as a header and a footer to generate transmission data (step S17).
  • the data transmission unit 43 of the processing unit 31 transmits the transmission data generated by the transmission data generation unit 42 to the in-vehicle communication device 10 by the road-to-vehicle communication unit 33 (step S18), and returns the processing to step S11. .
  • the in-vehicle communication device 10 mounted on the vehicle 1 transmits the vehicle information related to the vehicle 1 to the roadside communication device 3 installed on the road.
  • the roadside communication device 3 stores a plurality of certificate information 32a to be transmitted to the in-vehicle communication device 10 in the storage unit 32, generates a transmission data by combining the plurality of certificate information 32a stored, and generates The transmitted data is transmitted to the in-vehicle communication device 10.
  • the roadside communication device 3 adjusts the number of certificate information 32 a to be combined as transmission data based on the vehicle information received from the in-vehicle communication device 10.
  • the roadside communication device 3 can stably perform, for example, wireless communication with the in-vehicle communication device 10 based on the vehicle information received from the in-vehicle communication device 10. It is possible to adjust the number of certificate information combined as transmission data based on the determination result.
  • the vehicle speed of the vehicle 1 is transmitted as vehicle information from the in-vehicle communication device 10 to the roadside communication device 3.
  • the roadside communication device 3 adjusts the number of combinations so that the number of certificate information to be combined is increased as the vehicle speed is low, and the number of certificate information to be combined is decreased as the vehicle speed is high.
  • production of malfunctions such as data transmission from the roadside communication apparatus 3 to the vehicle-mounted communication apparatus 10, failing on the way, can be suppressed.
  • the frequency of data transmission is set based on the vehicle information received from the in-vehicle communication device 10. adjust. If the frequency of communication with one in-vehicle communication device 10 is increased, retransmission can be performed immediately even if data transmission fails, but the increase in communication volume may hinder data transmission to other in-vehicle communication devices 10 There is sex. Decreasing the frequency of communication with the in-vehicle communication device 10 can suppress an increase in communication volume, but it takes time until retransmission is performed when data transmission fails.
  • the roadside communication device 3 can stably perform, for example, wireless communication with the in-vehicle communication device 10 based on the vehicle information received from the in-vehicle communication device 10. It is possible to adjust the data transmission frequency based on the determination result.
  • the position information of the vehicle 1 is transmitted as vehicle information from the in-vehicle communication device 10 to the roadside communication device 3.
  • the roadside communication device 3 adjusts the transmission frequency so that the transmission frequency increases as the distance to the vehicle 1 increases and the transmission frequency decreases as the distance decreases.
  • the certificate information is transmitted from the roadside communication device 3 to the in-vehicle communication device 10, but the information to be transmitted is not limited to the certificate information.
  • the roadside communication device 3 may transmit any information as long as the information is transmitted only to a specific in-vehicle communication device 10 instead of transmitting to the plurality of in-vehicle communication devices 10 all at once.
  • the roadside communication device 3 is configured to adjust the number of combined certificate information and the frequency of data transmission.
  • the present invention is not limited to this. It may be configured to perform only one of the adjustment of the transmission frequency and the adjustment of the transmission frequency.
  • the vehicle speed and position of the vehicle 1 are transmitted as vehicle information from the in-vehicle communication device 10 to the roadside communication device 3, but the vehicle information to be transmitted is not limited to this.
  • the vehicle information transmitted from the in-vehicle communication device 10 to the roadside communication device 3 may include information such as the traveling direction of the vehicle 1, acceleration, planned travel route, and / or destination.
  • the roadside communication device 3 can determine whether the vehicle 1 is approaching or moving away from the roadside communication device 3, and the transmission frequency is set for the vehicle 1 moving away. For the vehicle 1 that is increased and approaches, adjustments such as reducing the transmission frequency can be performed.
  • the vehicle information transmitted from the in-vehicle communication device 10 to the roadside communication device 3 includes information on the necessity level of the certificate information in addition to the vehicle speed and position information of the vehicle 1.
  • FIG. 10 is a schematic diagram for explaining the necessity of certificate information that the in-vehicle communication device 10 transmits as vehicle information in the road-to-vehicle communication system according to the modification.
  • the in-vehicle communication device 10 according to the modified example can use the certificate information by comparing the expiration date (effective date) attached to the certificate information owned by itself and the current date and time, for example. Calculate the remaining deadline.
  • the in-vehicle communication device 10 sets the necessity level of the certificate information to 0 when the remaining period of the certificate information is one month or more, and sets the necessity level to 1 when the remaining period is less than one month and more than one week.
  • the necessary degree is set to 2 when the validity period has already been reached (expired), the necessary degree is set to 3.
  • the in-vehicle communication device 10 according to the modified example transmits the necessity level of the certificate information determined in this way to the roadside communication device 3 as vehicle information together with the vehicle speed and position information of the vehicle 1.
  • the roadside communication device 3 that has received the vehicle information from the in-vehicle communication device 10 adjusts the frequency of data transmission to the in-vehicle communication device 10 according to the necessity of the certificate information included in the vehicle information.
  • the roadside communication device 3 according to the modified example first transmits data to the in-vehicle communication device 10 as shown in FIG. 6 according to the distance to the in-vehicle communication device 10 calculated from the position information included in the vehicle information. Determine the frequency (transmission cycle).
  • the roadside communication device 3 further adjusts the transmission cycle determined according to the distance according to the necessity included in the vehicle information. For example, the roadside communication device 3 can adjust the transmission cycle so that the transmission cycle becomes shorter as the necessity increases. As shown in FIG.
  • the roadside communication device 3 when the transmission cycle is determined in five stages, the roadside communication device 3 according to the modified example shortens the transmission cycle by one step if the necessity is 1, and the transmission cycle if the necessity is 2. Is shortened by two steps, and if the degree of necessity is 3, the transmission cycle is shortened by three steps.
  • the road-side communication device 3 transmits the certificate information from the in-vehicle communication device 10 to the road-side communication device 3 by including the necessity of the certificate information in the vehicle information. It is possible to preferentially transmit data to the in-vehicle communication device 10 that needs more.
  • the frequency of data transmission from the roadside communication device 3 to the in-vehicle communication device 10 is adjusted according to the necessity of the certificate information. Absent.
  • the roadside communication device 3 may be configured to adjust the number of combined certificate information according to the necessity, such as increasing the number of combined certificate information as the necessity of the certificate information increases. Thus, the transmission frequency and the coupling number may be adjusted together. Further, instead of transmitting the necessity level of certificate information from the in-vehicle communication device 10 to the roadside communication device 3, the roadside communication device 3 receiving the certificate information expiration date and determining the necessity level transmits the certificate information. Also good.
  • FIG. 11 is a block diagram illustrating a configuration of the certificate issuing server device 205 according to the second embodiment.
  • the process of adjusting the number of combined certificate information and the frequency of data transmission based on the vehicle information transmitted by the in-vehicle communication device 10 is performed instead of the roadside communication device 3.
  • the server device 205 performs this. For this reason, when the roadside communication device 3 according to the second embodiment receives vehicle information from the in-vehicle communication device 10 of the vehicle 1, the roadside communication device 3 transmits this vehicle information to the certificate issuing server device 5.
  • the processing unit 61 is provided with a coupling number adjusting unit 44 and a transmission frequency adjusting unit 45.
  • the certificate issuing server device 205 that has received the vehicle information relayed by the roadside communication device 3 determines the number of certificate information combinations by the combination number adjustment unit 44 based on the received vehicle information, and the transmission frequency adjustment unit 45. To determine the frequency of data transmission.
  • the certificate issuing server device 205 notifies the roadside communication device 3 of the determined combination number and transmission frequency, and the roadside communication device 3 that has received this notification uses the combination number and transmission frequency determined by the certificate issuing server device 205.
  • the certificate information is transmitted to the in-vehicle communication device 10.
  • the certificate issuing server device 205 includes a roadside communication device that transmits certificate information in addition to adjustment of the number of connections and transmission frequency according to the vehicle speed and position of the vehicle 1 given as vehicle information.
  • the number of connections and the transmission frequency are further adjusted according to the communication capability of No. 3.
  • FIG. 12 is a schematic diagram for explaining the adjustment process according to the communication capability of the roadside communication device 3 performed by the certificate issuing server device 205 according to the second embodiment.
  • the communication capability of the roadside communication device 3 is rated in three stages of 1 to 3, and the communication capability is higher as the numerical value is larger.
  • the communication capability of the roadside communication device 3 is not only the capability as a device indicated by the strength of a radio signal that can be output by the roadside communication device 3 or the communication range of the roadside communication device 3, for example. It is determined in consideration of the surrounding environment where it is installed. Even when the same device is used as the roadside communication device 3, for example, when there are many buildings that shield radio signals in the surroundings, it can be considered that the communication capability is low.
  • the certificate issuing server device 205 stores the communication capability of one or more roadside communication devices 3 that can be adjusted in the storage unit 62 as roadside communication device information 262b.
  • the communication capability of each roadside communication device 3 is determined in advance by, for example, a designer of a road-to-vehicle communication system or an installer of the roadside communication device 3 based on simulation or actual measurement, and is stored in the storage unit 62 as roadside communication device information 262b. Keep it.
  • the certificate issuing server device 205 first combines certificate information by the roadside communication device 3 as shown in FIG. 5 based on the vehicle speed included in the vehicle information received from the roadside communication device 3. Determine the number. Next, the certificate issuing server device 205 further adjusts the number of connections determined according to the vehicle speed according to the communication capability of the roadside communication device 3 that transmits data to the in-vehicle communication device 10. For example, the certificate issuing server device 205 can adjust the number of couplings so that the number of couplings decreases as the communication capability decreases, and the number of couplings increases as the communication capability increases. As shown in FIG.
  • the certificate issuing server 205 sets the number of connections to 1 when the communication capability of the roadside communication device 3 is set to 1.
  • the number of connections is increased by one step.
  • the certificate issuing server device 205 performs on-vehicle communication by the roadside communication device 3 based on the position information included in the vehicle information received from the roadside communication device 3, as shown in FIG. The period of data transmission to the device 10 is determined.
  • the certificate issuing server device 205 further adjusts the transmission cycle determined according to the distance from the roadside communication device 3 to the vehicle 1 according to the communication capability of the roadside communication device 3 that transmits data to the in-vehicle communication device 10.
  • the certificate issuing server device 205 can adjust the coupling number so that the transmission cycle is shorter as the communication capability is lower and the transmission cycle is longer as the communication capability is higher. As shown in FIG.
  • the certificate issuing server device 205 sets the transmission cycle to 1 when the communication capability of the roadside communication device 3 is set to 1.
  • the transmission cycle is increased by one step.
  • the road-side communication device 3 transmits the vehicle information received from the in-vehicle communication device 10 to the certificate issuing server device 205, and the certificate information corresponding to the vehicle information is stored.
  • the certificate issuing server device 205 adjusts the number of combinations and the data transmission frequency, and the roadside communication device 3 combines certificate information and transmits data according to the adjustment result.
  • the certificate issuing server device 205 stores information on the communication capability of the roadside communication device 3, and adjusts the number of connections and the data transmission frequency in consideration of the communication capability of the roadside communication device 3 to be adjusted. Do. Thereby, in the road-to-vehicle communication system, it is possible to adjust the number of connections and the data transmission frequency suitable for the communication capability of the roadside communication device 3.
  • the communication capability of the roadside communication device 3 is determined in advance and stored in the storage unit 62 of the certificate issuing server device 205 as roadside communication device information 262b.
  • the certificate issuing server device 205 acquires the history information of the wireless communication with the vehicle 1 by the roadside communication device 3 and calculates the success rate or failure rate of the wireless communication from this information to communicate with the roadside communication device 3. It is good also as a structure which determines capability.
  • the certificate issuing server device 205 performs the adjustment process.
  • the present invention is not limited to this.
  • a server device other than the certificate issuing server device 205 may perform the adjustment process.
  • a dedicated server device may be provided.
  • the number of combinations determined by the certificate issuing server device 205 is notified to the roadside communication device 3, and the roadside communication device 3 combines a plurality of pieces of certificate information to generate transmission data.
  • the certificate issuing server device 205 may determine the number of certificate information combinations, and deliver a combination of a plurality of pieces of certificate information to the roadside communication device 3 according to the determined combination number.
  • the other configurations of the road-to-vehicle communication system according to the second embodiment are the same as those of the road-to-vehicle communication system according to the first embodiment. To do.

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PCT/JP2017/043293 2016-12-14 2017-12-01 路車間通信システム、路側通信装置、車載通信装置及び路車間通信方法 Ceased WO2018110323A1 (ja)

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