JP2005123691A - Roadside-vehicle communication system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a roadside-vehicle communication system in which a roadside apparatus can specify an arbitrary on-vehicle apparatus on a plurality of communication protocols and to use the plurality of protocols while switching them as necessary. <P>SOLUTION: Upon receiving LID from the on-vehicle apparatus 10, the roadside apparatus generates an IP address and correlates it, and notifies the on-vehicle apparatus 10 of the IP address. The roadside apparatus transmits the information to the on-vehicle apparatus 10 in response to an information request from the on-vehicle apparatus 10. To perform non-IP system communication with the on-vehicle apparatus 10, the roadside apparatus generates a request of switching the communication protocol to which a request identifier is added and transmits the request by IP system communication. The roadside apparatus 10 transmits a response identifier to the request identifier added to the switching request by the non-IP system communication. The roadside apparatus specifies the LID of the on-vehicle apparatus 10 which responds from the acquired response identifier and the issued request identifier, and transmits a next processing request by the non-IP system communication. The on-vehicle apparatus 10 responds by the non-IP system communication. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a road-to-vehicle communication system that performs communication between a roadside device and an in-vehicle device using radio waves, infrared rays, or the like.

  Conventionally, in a road-to-vehicle communication system, a roadside device generates an IP address (Internet Protocol Address) including an in-vehicle device identifier acquired from the in-vehicle device, and notifies the in-vehicle device of the IP address by transmitting the IP address to the in-vehicle device. A method of assigning an address and connecting to the Internet is known (for example, see Patent Document 1).

According to this method, when a DSRC (Dedicated Short Range Communication) initial connection request is received from the in-vehicle device, the in-vehicle device identifier LID (Link IDentifier) in which the roadside device is defined by ARIB-STD-T75 (hereinafter referred to as T75). The IP address is generated by combining with the network prefix, and when the DSRC initial connection response is received, the IP address is superimposed on the message and notified to the in-vehicle device. There is an effect that communication using a communication protocol for specifying an in-vehicle device using an LID and communication using a communication protocol for specifying an in-vehicle device using an IP address can be performed without requiring a communication sequence.
JP 2003-92576 A

  However, in a conventional road-to-vehicle communication system, an application installed in a roadside device includes a first communication protocol (for example, an IP communication protocol that specifies an in-vehicle device using an IP address) and a second communication protocol. (For example, when performing data communication with an application mounted on an in-vehicle device using a non-IP communication protocol that specifies the in-vehicle device using LID), the first communication protocol is used in the application of the roadside device. In this case, it is not possible to manage an identifier (for example, IP address) for specifying an in-vehicle device and an identifier (for example, LID) for specifying the in-vehicle device using the second communication protocol. Identify any in-vehicle device above and switch between multiple communication protocols as necessary. That there is a problem that can not be.

  The present invention has been made in view of such a conventional problem, and a roadside device specifies an arbitrary in-vehicle device on a plurality of communication protocols, and switches and uses a plurality of communication protocols as necessary. An object of the present invention is to provide a road-to-vehicle communication system capable of performing

A road-to-vehicle communication system according to the present invention is a road-to-vehicle communication system including a roadside device and an in-vehicle device that communicates with the roadside device using at least one of the communication protocols including the first and second communication protocols. The apparatus receives a communication protocol switching request issuing unit that issues a request for switching to the second communication protocol to the in-vehicle apparatus using the first communication protocol, and a switching response based on the second communication protocol from the in-vehicle apparatus in response to the switching request. A switching response receiving unit; and a communication protocol switching managing unit that manages the switching request issued by the switching request issuing unit and the switching response received by the switching response receiving unit in association with each other. And a switching request receiving means for receiving a switching request to the second communication protocol, and a communication request according to the switching request received by the switching request receiving means. Having a communication protocol switching means for switching the communication protocol to the second communication protocol, a configuration in which a switch response transmitting means for transmitting a switching response to the switching request in the second communication protocol.

  With this configuration, the roadside device can identify any on-vehicle device on a plurality of communication protocols, and can switch between a plurality of communication protocols as necessary. Therefore, it is possible to realize a road-to-vehicle communication system that can properly use an appropriate communication protocol according to the type of data exchanged by communication.

  In the road-vehicle communication system of the present invention, the switching request includes a request identifier for identifying the switching request, and the switching response includes a response identifier corresponding to the request identifier.

  With this configuration, the roadside device can know which communication protocol switching request issued by the roadside device in the past corresponds to the switching response received from the in-vehicle device. That is, it is possible to know from which in-vehicle device the response is received. Therefore, when the roadside device transmits data to the in-vehicle device that is the source of the switching response, it is possible to specify the same in-vehicle device on a plurality of types of communication protocols and perform data communication.

  In the road-to-vehicle communication system of the present invention, the first communication protocol is a communication protocol that identifies the in-vehicle device using an identifier other than the IP address, and the second communication protocol is the in-vehicle device that uses the IP address. The communication protocol is specified.

  With this configuration, data communication between the roadside device and the in-vehicle device using a communication protocol for specifying the in-vehicle device using the IP address becomes possible. In addition, since the assignment of the IP address to the in-vehicle device can be performed completely independently of the communication protocol specified using an identifier other than the IP address such as LID, the same IP address may be assigned to different in-vehicle devices. It is possible to avoid the conventional problem of being.

  Furthermore, in the road-to-vehicle communication system of the present invention, the first communication protocol is a communication protocol that specifies an in-vehicle device using an IP address, and the second communication protocol specifies an in-vehicle device identifier other than the IP address. It has a configuration that it is a communication protocol used to specify an in-vehicle device.

  With this configuration, data communication between the roadside device and the in-vehicle device using a communication protocol for specifying the in-vehicle device by the in-vehicle device identifier other than the IP address such as LID becomes possible. Therefore, the roadside device can select the communication protocol for specifying the vehicle-mounted device by the vehicle-mounted device identifier other than the IP address according to the type of data transmitted and received in the data communication between the roadside device and the vehicle-mounted device.

  The in-vehicle device issues a request for switching to the second communication protocol using the first communication protocol, the in-vehicle device switches the communication protocol to the second communication protocol in response to the switching request, and transmits a switching response. By receiving the switching response and managing it in association with the switching request, the roadside device can identify any on-vehicle device on multiple communication protocols and switch between multiple communication protocols as necessary. It becomes possible. Therefore, there is an effect that it is possible to provide a road-to-vehicle communication system capable of properly using an appropriate communication protocol according to the type of data exchanged by communication.

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

  The conceptual diagram which shows the structure of the parking fee payment system which is a road-vehicle communication system in the 1st Embodiment of this invention is shown in FIG. In FIG. 1, a vehicle 1 exists in a communication area 3 formed by a roadside system 2 including a roadside device 20 and a vehicle entrance / exit gate (not shown), and the vehicle-mounted device 10 mounted on the vehicle 1 and the roadside. Data is transmitted and received between the systems 2.

  As shown in FIG. 2, the in-vehicle device 10 mounted in the vehicle 1 is defined by an antenna 11 that performs radio wave transmission to the roadside device 20 that constitutes the roadside system 2 and radio wave reception from the roadside device 20 and T75. A DSRC protocol unit 12 that modulates and demodulates data, an ASL lower protocol unit 13 that performs various communication controls defined by ARIB TR-T17 (hereinafter referred to as T17), and an application defined by T17. A non-IP ASL upper protocol unit 14 that performs control related to cooperation, an IP system protocol unit 15 that realizes IP communication on the DSRC protocol, an application unit 16 that operates on these protocols, and ISO / IEC7816 IC card 171 with a credit function as specified and input from the user A button 172 for receiving, and a browser 173 which has a screen for visually displaying the application and information for browsing the Web page.

  The application unit 16 includes a communication protocol switching control unit 161 that switches a communication protocol used in data communication in response to a request from the roadside device 20.

  Further, as shown in FIG. 3, the roadside device 20 constituting the roadside system 2 includes an antenna 21 that performs radio wave transmission to the in-vehicle device 10 and radio wave reception from the in-vehicle device 10, and data modulation / regulation defined by T75. A DSRC protocol unit 22 that performs demodulation, an ASL lower protocol unit 23 that performs various communication controls and the like that is defined in T17, and a non-IP system ASL upper protocol that performs control related to cooperation with an application that is defined in T17 Unit 24, an IP protocol unit 25 that realizes IP communication on the DSRC protocol, and an application unit 26 that operates on the protocol.

  The application unit 26 includes a communication protocol control unit 261 that makes a communication protocol switching request to the in-vehicle device 10 used when performing data communication with the in-vehicle device 10.

  Next, the parking fee settlement system, which is a road-to-vehicle communication system according to the first embodiment of the present invention, will be described with reference to FIG.

  When the vehicle 1 equipped with the in-vehicle device 10 reaches the exit gate installed in the parking lot and enters the communication area 3 configured by the road-side system 2 including the road-side system 20 (step S401), the road-side system 20 and the in-vehicle device 10 performs a predetermined initial connection process and becomes a communicable state (step S402). At this time, the in-vehicle device 10 notifies the roadside device 20 of the LID at the time of the initial connection request.

  In the roadside device 20, a new IP address is generated by the IP protocol unit 25 as necessary, and is associated with the LID acquired from the in-vehicle device 10. The created IP address is notified to the in-vehicle device 10 and is managed by the IP protocol unit 15 for conversion with its own LID. In addition, an initial access URL (Uniform Resource Locator) is notified from the IP system protocol unit 25 of the roadside device 20 to the in-vehicle device 10.

The application unit 16 of the in-vehicle device 10 transmits a charge guide screen information request using IP communication for the initial access URL notified from the application unit 26 of the roadside device 20 during the initial connection process (step S403). ). In response to the charge guide screen information request from the in-vehicle device 10, the application unit 26 of the roadside device 20 transmits to the in-vehicle device 10 charge guide screen information including charge request information and settlement confirmation information for the vehicle 1 (step S404). ).

  The application unit 16 of the in-vehicle device 10 displays a charge guide screen using the browser 173 and waits for the user to press the button 172 (step S405). When the application unit 16 of the in-vehicle device 10 detects the pressing of the button 172 (step S405), the button pressing information and the next screen information request are transmitted to the application unit 26 of the roadside device 20 using IP communication ( Step S406).

  The application unit 26 of the roadside device 20 transmits screen information during settlement processing to the vehicle 1 in response to the button press information and the next screen information request from the in-vehicle device 10 (step S407). The application unit 16 of the in-vehicle device 10 displays a payment processing screen using the browser 173 (step S408). The communication protocol control unit 261 of the roadside device 20 generates a communication protocol switching request for performing non-IP communication with the in-vehicle device 10.

  A request identifier (for example, the time when the communication protocol switching request is generated) for identifying the request is attached to the communication protocol switching request (step S409). The roadside device 20 transmits a communication protocol switching request to the in-vehicle device 10 by IP communication (step S410). When the communication protocol switching control unit 161 of the application unit 16 of the in-vehicle device 10 receives a communication protocol switching request through IP-based communication, it generates a corresponding response identifier (for example, the same content as the request identifier) from the attached request identifier. (Step S411).

  The response data including the generated response identifier is transmitted to the roadside device 20 by non-IP communication (step S412). In the communication protocol control unit 261 of the application unit 26 of the roadside device 20, the LID of the in-vehicle device 10 that has transmitted the response data is associated with the response identifier included in the response data acquired by non-IP communication and the issued request identifier. Is specified (step S413).

  When the LID of the in-vehicle device 10 is specified, the application unit 26 of the roadside device 20 transmits an IC card access request by non-IP communication to the application unit 16 of the in-vehicle device 10 (step S414). The application unit 16 of the in-vehicle device 10 performs a predetermined settlement process on the IC card 171 and transmits a response from the IC card 171 to the application unit 26 of the roadside device 20 by non-IP communication (step S415).

  When the settlement process is completed, the roadside system 2 opens the vehicle entry / exit gate.

  Thus, according to the present embodiment, it is possible to realize, for example, a parking lot fee settlement system using both IP communication and non-IP communication.

  Next, a second embodiment of the present invention will be described.

  FIG. 5 is a conceptual diagram showing the configuration of an e-mail delivery system that is a road-to-vehicle communication system according to the second embodiment of the present invention.

  The second embodiment shown in FIG. 5 and the first embodiment shown in FIG. 1 have slightly different configurations. In FIG. 5, the same reference numerals as those in FIG. 1 denote the same parts as those in the first embodiment shown in FIG. 1, and detailed description thereof will be omitted here, and only different points will be described. Will be explained. The difference is that the roadside system 2 is connected to the Internet 4.

  As shown in FIG. 6, the in-vehicle device 10 has a configuration slightly different from that of the first embodiment. In FIG. 6, the same reference numerals as those in FIG. 2 denote the same components as those in the first embodiment shown in FIG. explain. The difference is that the IC card 171 and the browser 173 are omitted from the application unit 16 constituting the in-vehicle device 10 and a liquid crystal display unit (LCD) 174 is provided.

  As shown in FIG. 7, the roadside apparatus 20 has a configuration slightly different from that of the first embodiment. In FIG. 7, the same reference numerals as those in FIG. 3 denote the same parts as those in the first embodiment shown in FIG. explain. The difference is that the roadside device 20 is connected to the Internet 4, and the application unit 26 of the roadside device 20 sends an e-mail sent to the e-mail address of the user who owns the in-vehicle device 10 registered in advance to the Internet 4. This is to provide an e-mail management unit 262 that obtains, stores, and distributes the information to the in-vehicle device 10.

  Next, the operation of the electronic mail delivery system according to the second embodiment of the present invention will be described with reference to FIG.

  The e-mail management unit 262 of the application unit 26 of the roadside apparatus 20 acquires an e-mail sent to the e-mail address of the user who owns the in-vehicle apparatus 10 that has been registered in advance via the Internet 4 (step S801). . When the e-mail management unit 262 acquires the e-mail, the e-mail management unit 262 transmits an e-mail reception notification by non-IP communication to the in-vehicle device 10 owned by the e-mail address owner (step S802).

  When receiving the e-mail reception notification, the application unit 16 of the in-vehicle device 10 transmits an e-mail acquisition request to the roadside device 20 by IP communication (step S803). When the e-mail management unit 262 of the application unit 26 of the roadside device 20 receives the e-mail acquisition request from the in-vehicle device 10, the e-mail sent to the mail address of the user who owns the in-vehicle device 10 is sent to the IP system. It transmits to the vehicle-mounted apparatus 10 by communication (step S804).

  When acquiring the electronic mail, the application unit 16 of the in-vehicle device 10 displays an electronic mail acquisition message on the LCD 174 and waits for the user to press the button 172 (step S805). When the button press is detected (step S806), the application unit 16 displays the acquired e-mail on the LCD 174 (S807).

  Thus, according to the present embodiment, for example, an e-mail delivery system can be realized using both IP communication and non-IP communication.

  2 and 6, the application unit 16, the IP system protocol unit 15, the non-IP system ASL upper protocol unit 14, and the ASL lower protocol unit 13 are all configured in the same in-vehicle device 10, but these At least one of them may be configured in an external device of the in-vehicle device 10 and may be configured to be able to communicate with the in-vehicle device 10 by wired communication or wireless communication.

  3 and 7, the application unit 26, the IP system protocol unit 25, the non-IP system ASL upper protocol unit 24, and the ASL lower protocol unit 23 are all configured in the same roadside device 20. At least one may be configured in a device outside the roadside device 20, and may be configured to be able to communicate with the roadside device 20 by wired communication or wireless communication.

  2 and 6, the application unit 16 may be divided into a plurality of parts.

  3 and 7, the application unit 26 may be divided into a plurality of parts.

  The request identifier is the time when the roadside device generates the communication protocol switching request, and the response identifier is the same as the request identifier. However, if the roadside device can determine the corresponding request identifier by the response identifier, the request identifier May be the time when the roadside device transmits the communication protocol switching request, the serial number assigned to the transmission of the communication protocol switching request by the roadside device, or the management number assigned to the in-vehicle device in the communication area of the roadside device.

  Further, when the first communication protocol is an IP communication protocol and the second communication protocol is a non-IP communication protocol, the request identifier may be none or an IP address, and the response identifier may be an IP address. When the communication protocol is a non-IP communication protocol and the second communication protocol is an IP communication protocol, the request identifier may be none or LID, and the response identifier may be LID.

  As described above, in the road-to-vehicle communication system of the present invention, the in-vehicle device issues a request for switching to the second communication protocol using the first communication protocol, and the in-vehicle device uses the second communication protocol according to the switching request. By switching to the communication protocol and sending a switching response, the roadside device receives the switching response and manages it in association with the switching request, so that the roadside device identifies any in-vehicle device on multiple communication protocols and is necessary It becomes possible to switch between a plurality of communication protocols according to the situation.

  Therefore, there is an effect that an appropriate communication protocol can be properly used according to the type of data exchanged by communication, and road-to-vehicle communication is performed between the roadside device and the in-vehicle device using radio waves or infrared rays. It is useful as a communication system.

The conceptual diagram which shows the structure of the road-vehicle communication system in the 1st Embodiment of this invention. The block diagram of the vehicle-mounted apparatus in the 1st Embodiment of this invention The block diagram of the roadside apparatus in the 1st Embodiment of this invention The flowchart showing operation | movement of the road-vehicle communication system in the 1st Embodiment of this invention. The conceptual diagram which shows the structure of the road-vehicle communication system in the 2nd Embodiment of this invention. The block diagram of the vehicle-mounted apparatus in the 2nd Embodiment of this invention The block diagram of the roadside apparatus in the 2nd Embodiment of this invention The flowchart showing operation | movement of the road-vehicle communication system in the 2nd Embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Vehicle 2 Roadside system 3 Communication area which a roadside system forms 4 Internet 10 Car-mounted apparatus 11 Antenna 12 DSRC protocol part 13 ASL lower protocol part 14 Non-IP system ASL upper protocol part 15 IP system protocol part 16 Application part 20 Roadside apparatus 21 Antenna 22 DSRC protocol part 23 ASL lower protocol part 24 Non-IP system ASL upper protocol part 25 IP system protocol part 26 Application part 161 Communication protocol switching control part 171 IC card 172 Button 173 Browser 174 LCD
261 Communication protocol control unit 262 E-mail management unit

Claims (8)

A road-vehicle communication system including a roadside device and an in-vehicle device that communicates with the roadside device using at least one of the communication protocols including the first and second communication protocols,
The roadside device includes a communication protocol switching request issuing means for issuing a request for switching to the second communication protocol to the in-vehicle device using the first communication protocol, and the second from the in-vehicle device for the switching request. A switching response receiving means for receiving a switching response by a communication protocol, and a communication protocol switching management means for managing the switching request issued by the switching request issuing means and the switching response received by the switching response receiving means in association with each other. Prepared,
The in-vehicle device includes a switching request receiving unit that receives a switching request to the second communication protocol using the first communication protocol, and a communication that is used for the communication according to the switching request received by the switching request receiving unit. A road-to-vehicle communication system comprising: a communication protocol switching unit that switches a protocol to the second communication protocol; and a switching response transmission unit that transmits a switching response to the switching request using the second communication protocol. The road-to-vehicle communication system according to claim 1, wherein the switching request includes a request identifier for identifying the switching request, and the switching response includes a response identifier corresponding to the request identifier. The first communication protocol is a communication protocol that specifies the in-vehicle device using an identifier other than an IP address, and the second communication protocol is a communication protocol that specifies the in-vehicle device using an IP address. The road-to-vehicle communication system according to claim 1 or 2, characterized by the above. The first communication protocol is a communication protocol for specifying the in-vehicle device using an IP address, and the second communication protocol is a communication protocol for specifying the in-vehicle device using an identifier other than the IP address. The road-to-vehicle communication system according to claim 1 or 2, characterized by the above. A communication protocol switching request issuing means for issuing a request for switching to the second communication protocol to another device in the first communication protocol, and a switching response by the second communication protocol from the other device in response to the switching request; And a communication protocol switching management unit that manages the switching request issued by the switching request issuing unit and the switching response received by the switching response receiving unit in association with each other. The roadside device according to claim 5, wherein the switching request includes a request identifier for identifying the switching request, and the switching response includes a response identifier corresponding to the request identifier. A switch request receiving means for receiving a switch request to the second communication protocol in the first communication protocol, and a communication protocol used for communication according to the switch request received by the switch request receiving means is the second communication. A vehicle-mounted apparatus comprising: a communication protocol switching unit that switches to a protocol; and a switching response transmission unit that transmits a switching response to the switching request using the second communication protocol. The in-vehicle device according to claim 7, wherein the switching request includes a request identifier for identifying the switching request, and the switching response includes a response identifier corresponding to the request identifier.

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