JP4069895B2 - DSRC in-vehicle communication device - Google Patents

Description

  The present invention relates to an in-vehicle communication device configured to perform communication with a roadside device by a DSRC (narrow band communication) method.

  A communication system called DSRC (Dedicated Short Range Communication), which is a so-called narrow area communication method, defines a communication standard for performing wireless communication between a roadside device installed on the road side and an on-vehicle device mounted on the vehicle. It is currently applied to automatic toll collection systems for toll roads. This DSRC standard corresponds to various applications that perform narrow-area communication. In the ARIB DSRC standard (Non-Patent Document 1), “0” to “31” are assigned as AIDs (Application IDs). .

For example, AID = 14 used for an automatic toll collection system (ETC system) on a toll road is an application ID set as a multi-purpose toll collection system. In addition to this ETC system (Non-patent Document 2), toll collection is performed. All systems fall under AID = 14.
In this DSRC communication start procedure, the vehicle-mounted device that has received the control signal (FCMC) from the roadside device reads the application ID information included in the FCMC, and if it matches the AID that it supports, it communicates. Send a cue to start (ACTC). In response to this, the roadside device transmits a BST (Beacon Service Table) to the vehicle-mounted device, and when the vehicle-mounted device receives the BST, it returns a VST (Vehicle Service Table), and thereafter performs a charging process.

By completing such billing communication while passing through the road area communication area of the toll booth, the billing process can be executed reliably without stopping at the toll booth, and it must pass non-stop. Will be able to. As a result, it is possible to alleviate so-called tollgate congestion, and to completely unmanned the tollgate to eliminate personnel and to avoid adverse effects due to exhaust gas and the like.
ARIB STD-T75 ETC application interface specifications (narrow radio)

However, in recent years, application programs for communication using the DSRC system are being realized in addition to ETC, and as a result, the following problems may occur.
That is, the ETC on-board device can perform communication processing without problems when communicating with an ETC roadside device, but a DSRC communication system system applied to a roadside device other than an ETC roadside device, for example, a parking fee system, In the DSRC communication system applied to the drive-through shop fee payment system, etc., since the application program is different, when the VST is transmitted from the ETC on-board unit on the roadside side provided for each application Therefore, since it is not a corresponding on-vehicle device, the application cannot be started and communication is terminated.

  At this time, on the roadside device side, it is understood that the application was not started because communication was terminated by its own judgment, but from the viewpoint of the ETC on-board device side, whether the radio wave environment is bad and communication is not continued, the roadside device side It is impossible to distinguish whether the communication was cut off due to the circumstances. As a result, if, for example, the ETC on-board unit determines that the communication is abnormal, it is for ETC communication even though this is communication with a road device for other applications that is not for ETC installed at a gas station, for example. As a result of communication with roadside equipment, there is a problem such as erroneous notification as if it was determined that ETC is not available, and this may cause the user to misrecognize a failure There is.

  The present invention has been made in consideration of the above-described circumstances, and its purpose is to make it possible to correctly recognize the end of communication due to a difference in application when communicating with a roadside device in the DSRC method. To provide an apparatus.

According to the first aspect of the present invention, when the communication unit receives the BST signal transmitted from the roadside device in the DSRC system, the control unit causes the first determination unit to receive the BST (Beacon of the communication signals received from the roadside device. whether or not the information that matches the AID (application ID) application program for own communication in data contained in the Service Table) is contained is determined, along with obtaining a result the application program for communication are matched, second When it is determined by the determination means that the processing of the communication data has not ended normally, for example, the communication on the roadside device is terminated, the communication end means notifies the communication impossibility information.

As a result, when the processing of the communication data does not end normally, the communication means is not notified of the incommunicable information, so that the user can be terminated due to a communication abnormality due to a device failure or the like. It is possible to prevent an erroneous recognition that it has occurred.
This means that, for example, if the application for communication is different from the application that the roadside device is trying to communicate with, and the communication is interrupted without starting the communication on the roadside device, the content that the communication could not be made. It is possible to prevent notification.

According to the invention of claim 2, in the above invention, when the processing of communication data with the roadside device is not normally terminated by the communication end unit, the determination result by the first determination unit is inconsistent. As a result, the notification means is informed that the road device is not compatible with the application program for its own communication, so the communication does not end normally due to the road device corresponding to a different application program. This can be recognized by notifying the user.

According to the invention of claim 3, in each of the above-mentioned inventions, the first judging means finds information matching the application program for communication from the AID, EID (Element ID) and parameter information included in the BST. Since it is determined whether or not it is included, the communication application program in the DSRC communication method can be reliably recognized. In particular, when different communication application programs can be set with the same AID, the difference from the communication application program on the roadside device side can be reliably determined based on the EID and parameter information.

According to the invention of claim 5 , when the ETC communication processing is performed with an ETC roadside device provided at a toll gate such as a toll road, the control means performs communication received from the roadside device by the first determination means. It is determined whether or not information matching the application program for ETC communication is included in the AID data included in the BST in the signal, and the accounting process is normally performed with the ETC roadside device by the second determination means. in conjunction with the determined not to be completed, the determination result of the first determination means to notify the communication failure information notification unit by the communication termination means on condition that the match, with the ETC road equipment The communication failure information is notified to the user only when the communication does not end normally, so it is impossible to start communication with a roadside device or the like for which another communication application is set. In the case of Tsu, inadvertently no longer be become informed that the ETC communication process was impossible for the user, there is no possible to give the impression as if it was a failure.

According to the invention of claim 6, in the invention of claim 5 , the first determining means is an application for ETC communication when the value of AID data is “14” and no data of EID and parameter exists. Since it is determined that it matches the program, charging processing can be performed without any trouble even in communication with a roadside device that transmits BST without AID data and parameter information only by AID data, such as a conventional roadside device. Will be able to run.

According to the invention of claim 7, in the invention of claim 5 or 6 , when the value of the AID data is “14” and the data of EID and parameter exists, the first judging means performs the EID and parameter When the data of EID corresponds to the application program for ETC communication, the AID data is “14” and the data of EID and parameter corresponds to the application program of ETC. It is possible to reliably identify different cases.

(First embodiment)
Hereinafter, a first embodiment when the present invention is applied to an ETC vehicle-mounted device will be described with reference to FIGS. 1 to 7.
FIG. 3 shows a schematic configuration of an ETC system including an automobile 2 equipped with the ETC vehicle-mounted device 1 and an ETC roadside device 4. The ETC vehicle-mounted device 1 is formed in a compact shape so as to be used by being attached to the dashboard of the automobile 2 or a desired position.

  The ETC system is configured as follows. When a toll gate such as a toll road is provided with a gate for payment of tolls, and the car 2 being used is equipped with the ETC on-board unit 1, as shown in FIG. In addition, a gate provided in an ETC-dedicated lane can be used. At this gate, vehicle detectors 3a, 3b, 3c, a road antenna 4 as a road device, a gate 5, a display device 6, an anti-fraud camera 7 and the like are sequentially installed from the entrance side of the automobile 2 on the front side of the lane. ing.

  The road antenna 4 is fixed at the center of the gantry 4a, and communicates with the ETC vehicle-mounted device 1 of the automobile 2 traveling on the lane by transmitting a signal from above. Each of these devices is connected to a toll booth computer via a lane controller (not shown), and the on-board ETC device 1 and the road antenna 4 of the entering car 2 communicate to perform toll collection processing. The ETC in-vehicle device 1 is configured to be mounted with an IC card 13 (see FIG. 4) for paying a fee, and an amount corresponding to the toll is settled.

  FIG. 4 shows an electrical block configuration of the ETC vehicle-mounted device 1. The CPU 8 functions as a control unit, a determination unit, and a communication end unit, and is configured to execute an application program for ETC communication processing described later. In this case, the ETC encrypts and processes the communication data for security reasons, and the CPU 8 is configured to have the functions of the encryption process and the decryption process integrally (the encryption process and the decryption process). The function of the conversion processing can be implemented by a module provided separately). The CPU 8 is connected to a DSRC communication circuit 9 as communication means, and is connected to an antenna 11 via an RF circuit 10. The memory 12 stores programs and various data for performing various processes such as communication processes and toll collection processes, and is connected to the CPU 8.

  The IC card I / F (interface) 13a is for electrically reading information stored therein by the CPU 8 when the IC card 13 is inserted. A speaker 14 as a notification means for performing voice guidance is connected to the CPU 8 via a voice synthesis output circuit 15. The LED 16 is connected to the CPU 8 and is controlled to light up so as to notify whether or not the settlement process is completed when passing through a toll gate, for example.

The switch 17 is connected to the CPU 8 and is provided when the user wants to know history information or adjust the volume. Actually, for example, two operation buttons are provided. When one button is operated, history information is output as a sound under the control of the CPU 8, and when the other button is operated, the volume is increased (or decreased) for each operation. Can be changed.
For example, an external I / F (interface) 18 is connected to the CPU 8 for communication with an external device such as a car navigation device. The power supply circuit 19 converts the output of the in-vehicle battery into a predetermined voltage and supplies power to each internal circuit.

Next, the operation of this embodiment will be described. In the description of this operation, the fee collection processing by the ETC on-board device 1 is almost the same as the charge collection processing of a general ETC on-vehicle device, so the operation will be schematically described here. An application program determination process at the start of communication processing according to the present invention will be described in detail.
FIG. 5 shows a schematic communication procedure when the ETC vehicle-mounted device 1 starts communication with the road antenna 4.

  When the power is turned on and the system is activated, the CPU 8 of the ETC on-vehicle device 1 starts processing as follows. First, the CPU 8 executes initialization processing and waits for reception of an ETC communication frame from the road antenna 4. When the automobile 2 enters the ETC lane of the toll gate, the ETC on-vehicle device 1 receives the ETC communication frame from the road antenna 4, demodulates the received signal by the DSRC communication circuit 9, and inputs it to the CPU 8. The CPU 8 starts the ETC communication process.

  In the DSRC communication start procedure, as shown in FIG. 5, the road antenna 4 side periodically transmits a control signal (FCMC), and the ETC onboard device 1 that has entered the communication area receives it. , AID information included in the FCMC is read. The AID information is classified by code as shown in FIG. Here, if the ETC on-board unit 1 matches the AID that it supports, that is, “14”, which is the code of the multipurpose charge collection system, a signal (ACTC) for starting communication is transmitted.

On the road antenna 4 side, when ACTC is received from the ETC vehicle-mounted device 1, BST is transmitted to the ETC vehicle-mounted device 1 accordingly. In this BST, for example, a code as shown in FIG. 7 is described. In the ETC on-vehicle device 1, when this BST is received, the CPU 8 starts the BST reception processing program shown in FIG. 1.
The CPU 8 first searches for “Application List” included in the received BST (step S1). Here, the mandatory (mand) and non-essential (non-mand) optional (OPTIONAL) are described, and the aforementioned AID is included as an essential item, but EID and parameter are described as optional information. . Further, in the conventional type of road antenna, EID and parameter which are optional information are empty and cannot be detected.

Next, the CPU 8 determines whether or not the above-mentioned EID and parameter are empty in the BST (step S2). If the BST is received from the road antenna 4 of the new system including these, “NO” is determined. This EID and parameter are stored in the internal memory (step S3).
Subsequently, the stored EID and parameter are compared with information corresponding to the ETC charging process EID and parameter set in the ETC on-board unit 1 (step S4) to identify the ETC. If information that can be used is included, the application detection flag is set to ON (steps S5 and S6).

  In this specific process, the ETC application interface specification (narrow band radio) states that “the value of EID is unique throughout the DSRC session within OBE. This value is included in the parameter. There is a rule that “it should be logically related to the corresponding EFC-ContextMark”, and this is to be verified based on the fact that the EFC-ContextMark (ETC information) and EID are associated with each other.

If the ETC cannot be specified by the above collation, the application detection flag is set to off (steps S5 and S7), and the process returns. On the other hand, if “YES” is determined in the above-described step S2, the CPU 8 determines that the application is an ETC billing process, turns on the application detection flag in step S6, and returns.
Thereafter, if the application is an ETC billing process, its own VST (Vehicle Service Table) is returned to the road antenna 4 side to start the billing process program (see FIG. 5). If this is received and it is confirmed that it is the ETC on-vehicle device 1, communication for the billing process will be executed thereafter. In this billing process, billing information is written to the IC card 13 on the ETC on-board unit 1 side by exchanging billing information with the road antenna 4.

  When the accounting process ends normally and the communication process ends, the CPU 8 executes the communication end process shown in FIG. The CPU 8 first notifies the user of the communication result by voice or lighting control of the LED 16 when the communication is normally completed (determined as “YES” in Step T1). Here, for example, voice data for announcing the toll is output to the voice synthesis output circuit 15 through the speaker 14 (step T2).

On the other hand, when the information for specifying the ETC is not included in step S5 of FIG. 1 described above, the other roadside machine with which the ETC onboard equipment 1 is communicating is not the roadside antenna 4 of the ETC. Therefore, on the roadside device side, the communication with the ETC on-board unit 1 is terminated without starting.
In this case, on the ETC on-board unit 1 side, the CPU 8 starts the communication end process shown in FIG. 2 when a predetermined time elapses because the communication is unilaterally disconnected. Since the communication has not ended normally, the CPU 8 determines “NO” in step T1 to determine whether or not the application detection flag is on (step T3). Exit without executing.

  If the communication is interrupted because the communication with the road antenna 4 of the ETC is actually started, the CPU 8 determines “YES” in step S5 in the BST reception process of FIG. 1 and sets the application detection flag. Since it is set to ON, in the communication end process of FIG. 2, “YES” is determined in step T3. In this case, since the ETC on-board unit 1 was interrupted while attempting to communicate with the road antenna 4, the announcement of the communication result is performed by outputting a voice such as “communication could not be performed”, for example. Notification of the failure of the accounting process will be sent.

  According to the first embodiment as described above, when communication is started by the DSRC method, whether or not the information specifying the application program for communication is included in the BST transmitted from the roadside device side. If the application detection flag is turned off when the application detection flag is turned off when the application detection flag is turned off, the application detection flag is turned on / off. Even when an attempt is made to communicate with a road device of a different application program that adopts the method, the notification operation that gives the user a misunderstanding as if it has failed is eliminated, and the reliability can be improved.

  In addition, when communicating with the ETC road antenna 4, the application detection flag is set to ON. Therefore, if the communication ends normally, a notification to that effect is given, and if it does not end normally, Therefore, accurate information can be transmitted to the user.

(Second Embodiment)
FIG. 8 shows a second embodiment of the present invention. The difference from the first embodiment is a communication end process. In the first embodiment, when communication is not completed normally and the application detection flag is off, the process ends without any notification. In this embodiment, however, FIG. As shown in step T4, voice data is output to the voice synthesis output circuit 15 in order to notify the speaker 14 that the application is different by voice.

  Thus, for example, after a signal is transmitted from a roadside device of DSRC system and communication start is notified by the LED 16 or the like to start communication, it is understood that the application is not an ETC communication antenna 4 but another application. Can be notified to the user, and it can be surely recognized that the object is not a failure but a different object.

(Third embodiment)
FIG. 9 shows a third embodiment of the present invention. The difference from the first embodiment is that the vehicle-mounted communication apparatus is configured not to be a vehicle-mounted device dedicated to ETC but to execute other communication application programs. It is being applied to.
In other words, in-vehicle communication apparatus having a configuration corresponding to a plurality of communication application programs so as to be compatible with the usage of ETC and also compatible with, for example, a parking lot fee system and a drive-through shop fee system It is.

In the in-vehicle communication device having such a configuration, AID, EID, and parameter codes are stored in advance for each of these application programs. In order to execute these communication application programs, it is necessary to perform communication by identifying whether or not the communication with the roadside device corresponds to any one of these.
FIG. 9 shows a flowchart of the BST reception process, and specifically, is substantially the same as that shown in the first embodiment. In this embodiment, in order to specify the application program set for itself, not only AID but also EID and parameter information are always obtained from the roadside machine side, and there is a corresponding application program based on these information. It is set to determine whether or not (steps S1, S3, S4, S5).

  If the information for identifying the application program is included ("YES" is determined in step S5), the application detection flag corresponding to the application program is set to ON (step S6). If the information specifying the application program is not included ("NO" is determined in step S5), all application detection flags are turned off (step S7).

  As a result, as described above, when the communication process with the roadside device by the application program is not normally terminated and the roadside device is unilaterally disconnected by the roadside device, the CPU 8 sets the application detection flag on / off. Accordingly, it is possible to provide guidance such as notifying that the communication has failed, not notifying that the application is different, or notifying that the application is different.

  In the above embodiment, as in the case of the old type ETC road antenna, on the premise that the BST includes a roadside machine that includes only AID and does not include EID or parameter information, it is the same as in the first embodiment. Step S2 may be provided to determine that the program corresponds to an ETC application program, and the application detection flag may be set to ON.

(Other embodiments)
The present invention is not limited to the above embodiment, and can be modified or expanded as follows.
In addition to ETC, parking lots that perform DSRC communication processing, drive-through shops, gas stations, convenience stores, ferries, amusement park payment processing, and outdoor cinema admission fees It can be applied to the multi-purpose fee collection system.

In addition to the DSRC communication system for toll collection, an in-vehicle device that executes an application with another code of AID can be configured. In this case, it can be applied by providing a determination step for identifying AID.
In addition to the speaker 14, the notification means may emit a sound such as a buzzer or a chime, or may be displayed on a screen or a lamp.

The flowchart of the BST reception process which shows the 1st Embodiment of this invention. Flow chart of communication end processing Schematic configuration diagram of ETC system Electrical block diagram of ETC OBE Sequence diagram showing the communication procedure between on-vehicle equipment and roadside equipment Diagram showing AID code and corresponding application The figure which shows the data contents of BST FIG. 2 equivalent view showing the second embodiment of the present invention FIG. 1 equivalent view showing a third embodiment of the present invention

Explanation of symbols

In the drawings, 1 is an ETC vehicle-mounted device (vehicle-mounted communication device), 2 is an automobile, 4 is a road antenna (road device), 8 is a CPU (control means, determination means, communication end means) 9 is a DSRC communication circuit (communication means) , 13 is an IC card, 14 is a speaker (notification means), and 16 is an LED.

Claims (8)

A communication means for exchanging communication signals with a roadside machine by a DSRC (Dedicated Short Range Communication) method;
Control means for processing communication data provided with an application program for communication and exchanged with the roadside machine via the communication means;
An informing means for informing about the communication result,
The control means determines whether information matching the application program for its own communication is included in AID (Application ID) data included in a BST (Beacon Service Table) of communication signals received from the roadside device. a first determination means for determining, a second determination means for determining that the processing of the communication data between the roadside device is not completed normally, the communication is normally completed by the second determination means And a communication end unit that causes the notification unit to notify communication inability information on condition that the determination result by the first determination unit matches if it is determined that the determination is not performed. In-vehicle communication device. In the DSRC in-vehicle communication device according to claim 1,
The communication ending means, when the processing of communication data with the roadside device has not ended normally, provides the notifying means with its own information on the condition that the determination result by the first determining means is inconsistent. A DSRC in-vehicle communication device, characterized in that a road device not compatible with a communication application program is notified. In the DSRC in-vehicle communication device according to claim 1 or 2,
The first determining means determines whether information matching the application program for communication is included from AID, EID (Element ID) and parameter information included in the BST. DSRC in-vehicle communication device. In the DSRC in-vehicle communication device according to any one of claims 1 to 3,
The DSRC in-vehicle communication device, wherein the second determination means determines that the communication data processing with the roadside device has not ended normally on condition that a certain time has elapsed after the processing of communication data is interrupted. A communication means for exchanging communication signals with a roadside machine by a DSRC (Dedicated Short Range Communication) method;
Control means provided with an application program for communication and performing ETC (Electronic Toll Collection) communication processing with the roadside device via the communication means;
An informing means for informing about the charging processing result,
The control means determines whether or not information matching an application program for ETC communication is included in AID (Application ID) data included in a BST (Beacon Service Table) of communication signals received from the roadside device. Communication between the first determination means and the second determination means for determining that the billing process is not normally completed between the roadside device and the second determination means. And a communication end means for informing the informing means of incommunicable information on the condition that the judgment results by the first judging means coincide with each other . In the DSRC in-vehicle communication device according to claim 5,
The first determining means determines that the value matches the application program for ETC communication when the value of the AID data is “14” and there is no EID and parameter data. DSRC in-vehicle communication device. In the DSRC in-vehicle communication device according to claim 5 or 6,
The first determination means matches when the value of the AID data is “14” and the EID and parameter data correspond to the application program for ETC communication when the EID and parameter data exist. A DSRC in-vehicle communication device characterized by determining whether to In the DSRC in-vehicle communication device according to any one of claims 5 to 7,
The DSRC in-vehicle communication device, wherein the second determination means determines that the communication data processing with the roadside device has not ended normally on condition that a certain time has elapsed after the processing of communication data is interrupted.

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