JP2021170356A - Communication data processing system - Google Patents

Abstract

To provide a technology capable of executing appropriate processing even when the same communication data transmitted from the same on-vehicle machine is received in an overlapping manner.SOLUTION: The communication data processing system includes: a plurality of beacon heads 8 which set communication regions different from each other on a road; a central device 3 to which an uplink frame from an on-vehicle machine 2 received by the plurality of beacon heads 8 is given and which executes processing of the uplink frame. The central device includes an overlapping elimination processing part 33a which eliminates overlapping of communication data included in each of the uplink frames including the same vehicle ID when the central device 3 receives the plurality of uplink frames including the same vehicle ID within a predetermined period.SELECTED DRAWING: Figure 6

Description

The present invention relates to a communication data processing system.

As a traffic information service using a road-to-vehicle communication system, so-called VICS (Vehicle Information and Communication System: a registered trademark of the Vehicle Information and Communication System Center) using optical beacons, radio beacons, or FM multiplex broadcasting has already been developed. ing.
Of these, the optical beacon employs optical communication using near infrared rays as a communication medium, and is capable of two-way communication with an in-vehicle device. Specifically, information including travel time information between beacons held by the vehicle is transmitted from the on-board unit to the optical beacon on the infrastructure side.

On the contrary, the optical beacon transmits downlink information including congestion information, section travel time information, event regulation information, lane notification information, and the like to the in-vehicle device (see, for example, Patent Document 1).
Therefore, the optical beacon is provided with an optical communication device (hereinafter, also referred to as “beacon head”) for performing optical communication with the in-vehicle device for each lane.

Japanese Unexamined Patent Publication No. 2005-268925

Optical communication between the on-board unit and the optical beacon is performed by the following procedure. That is, when the in-vehicle device enters the area where it can communicate with the optical beacon (beacon head) on the road, it transmits an uplink frame including the ID of the own device as information toward the beacon head as an optical signal. When the beacon head receives the uplink frame, the beacon head transmits the downlink frame including the ID of the vehicle-mounted device as an optical signal toward the vehicle-mounted device.
When the in-vehicle device receives the downlink frame including the ID of the in-vehicle device, the in-vehicle device determines that communication has been established with the beacon head, and uploads communication data such as probe information of the own device together with the ID of the own device. It is stored in a frame and transmitted to the beacon head as an uplink frame.

Here, when the optical beacon is installed on a road having a plurality of lanes and a plurality of beacon heads are provided corresponding to the plurality of lanes, the optical beacon is an on-board unit for each of the plurality of beacon heads. The same uplink frame transmitted from may be received.
In this case, the optical beacon duplicately receives the same communication data transmitted from one in-vehicle device.

Further, as described above, the in-vehicle device stores the communication data in the uplink frame and generates the uplink frame.
At this time, the in-vehicle device is configured to store a plurality of communication data to be stored in a plurality of frames in a memory adopting, for example, a first-in first-out method, read the communication data from the memory, and store the communication data in the plurality of frames. Sometimes.
In the case of such a configuration, if new communication data is not sufficiently supplied to the memory, the communication data for which transmission has been completed may remain in the memory without being erased.
When the next transmission opportunity arrives with the communication data that has been transmitted remaining in the memory, the in-vehicle device stores the communication data transmitted in the past in the frame again and transmits the same communication data again. It is possible that it will end up.
In this case, the same communication data transmitted from the same in-vehicle device will be received in duplicate by different optical beacons.

As described above, when the same communication data transmitted from the same in-vehicle device is received in duplicate, the optical beacon or the processing unit that processes the communication data received by the optical beacon duplicates exactly the same data. Since it is processed, there is a possibility that appropriate processing cannot be performed.

The present invention has been made in view of such circumstances, and provides a technique capable of appropriately processing even when the same communication data transmitted from the same in-vehicle device is received in duplicate. The purpose is to do.

In the communication data processing system of one embodiment, a plurality of light emitting / receiving devices that set different communication areas on the road and a communication frame from an in-vehicle device received by the plurality of light receiving / receiving devices are provided, and the communication frame is provided. When a plurality of communication frames including the same vehicle ID are acquired within a predetermined period, the processing device includes a plurality of the communication frames including the same vehicle ID. It is equipped with a deduplication unit that eliminates duplication of communication data contained in each frame.

Further, in the communication data processing system of one embodiment, a plurality of optical beacons that perform wireless communication with an in-vehicle device of a moving vehicle by optical signals and a communication frame from the in-vehicle device received by the plurality of optical beacons are used. A central control device that is given and performs a predetermined process on the communication frame information is provided, and the central control device is the same when a plurality of the communication frames including the same vehicle ID are acquired within a predetermined period. It is provided with a duplication elimination unit that eliminates duplication of communication data included in each of the plurality of communication frames including the vehicle ID of the above.

According to the present invention, even when the same communication data transmitted from the same in-vehicle device is received in duplicate, it can be appropriately processed.

FIG. 1 is a block diagram showing an overall configuration of a road-to-vehicle communication system (communication data processing system) according to an embodiment. FIG. 2 is a plan view of the road R when the installation portion of the optical beacon of the present embodiment is viewed from above. FIG. 3 is a side view showing the communication area A of the optical beacon. FIG. 4 is a diagram showing a configuration of an upstream frame. FIG. 5 is a sequence diagram showing an example of road-to-vehicle communication performed in the communication area A. FIG. 6 is a block diagram showing a configuration of an optical beacon beacon controller and a central device in the road-to-vehicle communication system according to the first embodiment. FIG. 7 is a diagram showing an example of the contents of the uplink frame transmitted by the vehicle-mounted device 2 and the contents of the uplink frame when the beacon head of the optical beacon receives the uplink frame. FIG. 8 is a block diagram showing a configuration of a beacon controller for an optical beacon according to a modified example of the first embodiment. FIG. 9 is a diagram for explaining a mode of processing performed by the central device of the second embodiment. FIG. 10 is a block diagram showing a configuration of a road-to-vehicle communication system according to a third embodiment. FIG. 11 is a diagram showing an example of the contents of the uplink frame transmitted by the vehicle-mounted device and the contents of the vehicle information acquired by the central device when the beacon head of the optical beacon receives the uplink frame. FIG. 12A is a diagram for explaining an example of processing when the vehicle-mounted device stores the communication data in the uplink frame, and shows an example when the vehicle-mounted device transmits the communication data. FIG. 12B is a diagram showing an example of processing when new communication data is generated after FIG. 12A.

[Explanation of Embodiment]
First, the contents of the embodiments will be listed and described.
(1) In the communication data processing system of one embodiment, a plurality of light emitting / receiving devices that set different communication areas on the road and a communication frame from an in-vehicle device received by the plurality of light receiving / receiving devices are provided. A processing device that performs a predetermined process on the communication frame is provided, and when a plurality of the communication frames including the same vehicle ID are acquired within a predetermined period, the processing device includes a plurality of the same vehicle ID. It is provided with a deduplication unit that eliminates duplication of communication data included in each of the communication frames.

According to the communication data processing system having the above configuration, when a plurality of light receiving / receiving receivers receive the same communication frame and the processing device acquires a plurality of communication frames including the same vehicle ID within a predetermined period. Since duplication of communication data included in each of a plurality of communication frames including the same vehicle ID is eliminated, it is possible to prevent duplicate processing of communication frames containing the same communication data from the same in-vehicle device. , Communication frame processing can be performed appropriately.

(2) In the communication data processing system, when the communication frame is given to the processing device as a communication frame group composed of the plurality of the communication frames, the deduplication unit is a plurality of the communications including the same vehicle ID. When the frame group is acquired, it is preferable to execute the predetermined process for one communication frame group among the plurality of communication frame groups and discard the other communication frame group.
In this case, the duplication of communication data can be eliminated more easily than the duplication of communication data for each communication frame.

(3) In the communication data processing system, the deduplication unit uses the communication frame group acquired first among the plurality of communication frame groups including the same vehicle ID as the one communication frame group. It is preferable to execute the process of.
In this case, it is possible to discard all of the plurality of communication frame groups including the same vehicle ID, which are acquired later. As a result, the processing load related to deduplication of communication data can be reduced, and the processing becomes easy.

(4) In the communication data processing system, the deduplication unit compares the communication data included in each of the plurality of communication frames including the same vehicle ID with each other, and based on the comparison result, obtains the same vehicle ID. It may be decided whether or not to discard each of the plurality of communication frames including the communication frame.
In this case, since it is determined whether or not to discard each communication frame, it is possible to reduce the amount of communication data that is wasted.

(5) In the communication data processing system, during the predetermined period, the processing device acquires a plurality of the communication frames including the same vehicle ID when each of the plurality of light emitting / receiving receivers receives the same communication frame. It is preferable that the setting is based on the difference in acquisition timing at the time of.

(6) In the communication data processing system, the processing device is a central control device to which the communication frame is given from the light emitting / receiving device controlling device that controls the plurality of light emitting / receiving devices, and the predetermined processing is the communication. It may be the generation of a traffic index using the vehicle information included in the frame.

(7) Further, in the communication data processing system, the processing device is a light emitting / receiving control device that controls the plurality of light receiving / receiving devices, and in the predetermined processing, the communication frame is used as the light receiving / receiving device control device. It may be a transfer to a central controller connected to.

(8) The communication data processing system according to the embodiment includes a plurality of optical beacons that perform wireless communication with an in-vehicle device of a moving vehicle by optical signals, and a communication frame from the in-vehicle device received by the plurality of optical beacons. The central control device includes a central control device that performs a predetermined process on the communication frame information, and the central control device acquires a plurality of the communication frames including the same vehicle ID within a predetermined period. It is provided with a duplication elimination unit that eliminates duplication of communication data included in each of the plurality of communication frames including the same vehicle ID.

[Details of Embodiment]
Hereinafter, preferred embodiments will be described with reference to the drawings.
In addition, at least a part of each embodiment described below may be arbitrarily combined.

[Overall system configuration]
FIG. 1 is a block diagram showing an overall configuration of a road-to-vehicle communication system (communication data processing system) according to an embodiment.
As shown in FIG. 1, the road-to-vehicle communication system of the present embodiment includes a traffic control system 1 on the infrastructure side and an in-vehicle device 2 mounted on a vehicle 20 (see FIG. 3) traveling on a road R.

The traffic control system 1 includes a central device 3 provided in a traffic control room or the like, and a large number of optical beacons (optical vehicle detectors) 4 installed in various places on the road R. The optical beacon 4 can perform wireless communication with the vehicle-mounted device 2 by optical communication using near infrared rays as a communication medium.
The optical beacon 4 has a beacon controller 7 that performs communication control and the like, and a plurality of (four in the example of FIG. 1) beacon heads (light emitting and receiving receivers) 8 connected to the beacon controller 7.

The beacon controller 7 is connected to the central device 3 by a communication line 5 such as a telephone line.
The beacon controller 7 may be connected to the central device 3 via, for example, a traffic signal controller that controls the color of the signal lamp, an information relay device that relays traffic information on the infrastructure side, and the like.

The optical beacon 4 of the present embodiment employs a full-duplex communication system. That is, the beacon controller 7 simultaneously performs transmission control in the downlink direction when transmitting an optical signal to the vehicle-mounted device 2 and reception control in the uplink direction when receiving an optical signal from the vehicle-mounted device 2. ..
On the other hand, the on-board unit 2 adopts a half-duplex communication system. That is, the in-vehicle controller 21 (see FIG. 3), which will be described later, controls transmission in the uplink direction when transmitting an optical signal toward the optical beacon 4, and downlink when receiving the optical signal from the optical beacon 4. Directional reception control is not performed at the same time.

The beacon head 8 of the optical beacon 4 receives an optical transmission unit 10 for optical communication that transmits a downlink optical DO (see FIG. 3) that is an optical signal and an uplink optical UO (see FIG. 3) that is an optical signal. It has an optical receiving unit 11 for optical communication that converts the light into an electric signal.

The optical transmission unit 10 has a light emitting element composed of a light emitting diode (LED: Light Emitting Diode), and includes a transmission circuit that converts a transmission signal given from the beacon controller 7 into an optical signal in the downlink direction.
The light emitting element of the optical transmission unit 10 transmits the downlink light DO, which is an optical signal of near infrared rays, obliquely downward toward the upstream side. As a result, the optical transmission unit 10 of the beacon head 8 transmits the communication signal to be transmitted to the vehicle-mounted device 2 by the optical signal.

The optical receiving unit 11 has a light receiving element made of a photodiode (PD: Photo Diode) or the like, and includes a receiving circuit that generates a digital communication signal from an electric signal output by the light receiving element.
The light receiving element of the light receiving unit 11 receives the uplink signal UL, which is a near-infrared optical signal transmitted by the vehicle-mounted device 2 in front of the beacon head 8, and converts it into an electric signal. The receiving circuit of the optical receiving unit 11 acquires the communication signal transmitted by the vehicle-mounted device 2 from the converted electric signal. The receiving circuit sends the acquired communication signal to the beacon controller 7. As a result, the optical receiving unit 11 of the beacon head 8 receives the optical signal transmitted by the vehicle-mounted device 2 as a communication signal.

The beacon controller 7 has a function of performing road-to-vehicle communication with the vehicle-mounted device 2 via a beacon head 8 capable of transmitting and receiving optical signals, and communicates with the central device 3 to exchange communication data by road-to-vehicle communication. It has a function.

The beacon controller 7 stores communication data to be transmitted to the vehicle-mounted device 2 in a downlink frame, which is a predetermined communication frame, and gives the communication data to the beacon head 8 as a communication signal. The beacon controller 7 transmits this communication signal to the beacon head 8 to transmit the communication data to the vehicle-mounted device 2.

Further, the beacon controller 7 acquires an uplink frame storing various communication data when a communication signal from the vehicle-mounted device 2 is given from the beacon head 8. Further, the beacon controller 7 performs a process of transferring the acquired uplink frame to the central device 3.

When various communication data stored in the uplink frame from the in-vehicle device 2 are given from the beacon controller 7, the central device 3 uses vehicle information such as probe information included in the given various communication data to perform a traffic index. Etc. are generated.
The central device 3 also has a function of giving the generated traffic index to the vehicle-mounted device 2 via the optical beacon 4.

[Installation status of optical beacon and communication area]
FIG. 2 is a plan view of the road R when the installation portion of the optical beacon 4 of the present embodiment is viewed from above.
As shown in FIG. 2, the optical beacon 4 of the present embodiment is installed on a road R having a plurality of (four in the example) lanes R1 to R4 in the same direction.
The optical beacon 4 includes a plurality of the beacon heads 8 provided corresponding to each of the lanes R1 to R4, and one beacon controller 7 that collectively controls these beacon heads 8.

The beacon controller 7 is installed on a support column 13 erected on the side of the road. Each beacon head 8 is attached to an erection bar 14 erected horizontally from the support column 13 on the road R side, and is arranged immediately above the substantially center position of each lane R1 to R4.
The optical transmission unit 10 of the beacon head 8 emits a downlink signal DL toward the upstream side in the vehicle traveling direction rather than directly under the own machine. As a result, the communication area A for performing road-to-vehicle communication with the vehicle-mounted device 2 is set on the upstream side of the beacon head 8.

FIG. 3 is a side view showing the communication area A of the optical beacon 4.
As shown in FIG. 3, the communication area A of the optical beacon 4 is the downlink area DA (the hatched portion of the solid line in FIG. 3), which is the range in which the in-vehicle device 2 can receive the downlink signal DL, and the beacon head 8. It is composed of an uplink region UA (hatched portion of a broken line in FIG. 3) UA, which is a light receiving range of the link signal UL.

The downlink region DA is a range indicated by Δdac with the light receiving / receiving position d of the beacon head 8 and the positions a and c at a height of 1 m above the ground as vertices.
The uplink region UA is a range indicated by the light receiving / receiving position d of the beacon head 8 and Δdbc having the positions b and c at a height of 1 m above the ground as vertices.

[Configuration of in-vehicle device]
As shown in FIG. 3, the vehicle-mounted device 2 of the present embodiment includes a vehicle-mounted controller 21 and a vehicle-mounted head 22, and an optical transmitting unit 23 and an optical receiving unit 24 are housed inside the vehicle-mounted head 22. ing.
Of these, the optical transmission unit 23 has a light emitting element that emits uplink light UO (optical signal in the uplink direction) composed of near infrared rays. The light receiving unit 24 has a light receiving element that receives a downlink light DO (optical signal in the downlink direction) composed of near infrared rays.

The optical transmission unit 23 has a light emitting element composed of a light emitting diode, and includes a transmission circuit that converts a communication signal given from the vehicle-mounted controller 21 into an optical signal in the uplink direction.
The light emitting element of the optical transmission unit 23 transmits the uplink light UO, which is an optical signal of near infrared rays, toward the front side. As a result, the optical transmission unit 23 transmits the communication signal to be transmitted to the optical beacon 4 by the optical signal.

The optical receiving unit 24 has a light receiving element made of a photodiode or the like, and includes a receiving circuit that generates a digital communication signal from an electric signal output by the light receiving element.
The light receiving element of the optical receiving unit 24 receives the downlink optical DO from the optical beacon 4 and converts it into an electric signal, and acquires the communication signal transmitted by the optical beacon 4 from the converted electric signal. The receiving circuit sends the acquired communication signal to the in-vehicle controller 21. As a result, the optical receiving unit 24 receives the optical signal transmitted by the optical beacon 4 as a communication signal.

The in-vehicle controller 21 comprises a computer having a storage device such as a CPU (Central Processing Unit) and a memory, and has a function of controlling road-to-vehicle communication with the optical beacon 4.
A computer program for communication control is stored in the storage device of the in-vehicle controller 21, and the CPU reads and executes this program to realize a control function related to road-to-vehicle communication.

The in-vehicle controller 21 has a function of performing road-to-vehicle communication with the optical beacon 4 via the optical transmission unit 23 and the optical reception unit 24.
The in-vehicle controller 21 stores the communication data to be transmitted to the optical beacon 4 in the uplink frame, which is a predetermined communication frame, and gives the communication data to the optical transmission unit 23 as a communication signal. The in-vehicle controller 21 transmits this communication signal to the optical transmission unit 23 to transmit the communication data toward the optical beacon 4.
Further, when the communication signal from the optical beacon 4 is given from the optical receiving unit 24, the in-vehicle controller 21 acquires various communication data stored in the downlink frame of the communication signal and performs necessary processing.
Further, the in-vehicle controller 21 generates probe information (traveling locus data in which the passing position and passing time are arranged in chronological order) of the own vehicle as communication data, stores the probe information in the ascending frame, and transmits the optical transmission unit. It also has a function of transmitting to the optical beacon 4 via the 23.

FIG. 4 is a diagram showing a configuration of an upstream frame.
As shown in FIG. 4, in the storage area of the uplink frame, in order from the beginning, a transmission control unit for synchronization (hereinafter referred to as “synchronization unit”) for recognizing the frame break, a header unit, and an actual data unit. , And a transmission control unit (hereinafter, referred to as “CRC unit”) for CRC (Cyclic Redundancy Check).

In the uplink frame, 1 byte is allocated to the synchronization part, 10 bytes are allocated to the header part, a maximum of 59 bytes are allocated to the actual data part, and 4 bytes (1 byte idle part + 2 bytes CRC + 1 byte) are allocated to the CRC part. The final synchronization part) is assigned.

The header portion of the upstream frame includes a storage area such as the vehicle ID of the on-board unit 2 of the transmission source and the final frame flag.
The final frame flag is information for indicating which of the one or a plurality of uplink frames transmitted by the vehicle-mounted device 2 is the final frame.
For example, when the vehicle-mounted device 2 continuously transmits a plurality of uplink frames, the vehicle-mounted device 2 stores a predetermined flag value (for example, "1") as the final frame flag only in the "final frame flag" of the last uplink frame. , The flag value is not stored in other upstream frames. Further, when the vehicle-mounted device 2 transmits only one uplink frame, the vehicle-mounted device 2 stores the flag value in the uplink frame.

Communication data such as probe information is stored in the actual data unit.
The in-vehicle controller 21 stores communication data such as the vehicle ID of the own device 2 and probe information in the upstream frame, and transmits the communication data to the optical beacon 4.

[Road-to-vehicle communication in the communication area]
FIG. 5 is a sequence diagram showing an example of road-to-vehicle communication performed in the communication area A.
In FIG. 5, the downlink frame DL1 is a downlink frame that the optical beacon 4 repeatedly transmits in the initial state before receiving the low-speed uplink.
The downlink frame DL2 is a downlink frame that the optical beacon 4 repeatedly transmits after receiving the uplink.

The uplink frame UL1 is an uplink frame transmitted by the vehicle-mounted device 2 in response to the reception of the downlink frame DL1.
The uplink frame UL2 is an uplink frame transmitted by the vehicle-mounted device 2 in response to the reception of the downlink frame DL2.
A frame with a white circle indicates that the vehicle ID is not stored in this frame, and a frame with a black circle indicates that the vehicle ID is stored in this frame.

In FIG. 5, D ₀ indicates the communication data stored in the uplink frame UL1 transmitted by the vehicle-mounted device 2 in the uplink.
D _{1 to} D ₅ indicate a plurality of communication data stored in the uplink frame UL2 transmitted by the vehicle-mounted device 2 in the uplink. The number shown above each communication data D is the frame number of the uplink frame UL2 at the time of continuous transmission at one time.
FIG. 5 illustrates a case where the number of frames of the continuously transmitted uplink frame group is 5, but the number of frames is not limited to 5. For example, the uplink frame group may be composed of 6 or more (maximum 16 frames according to the standard).

The numbers assigned to the communication data D _{1 to} D ₅ indicate the order in which the communication data were generated, and the smaller the value of the number, the more the communication data was generated in the past. For example, among the communication data _D 1 to D _5, a communication data _{D 1} is the oldest data, the communication data _{D 5} is the most recent data.

Further, each downlink frame DL2 is transmitted in the order of the smallest frame number.
As shown in FIG. 5, the vehicle-mounted device 2 stores the newest communication data D ₅ to the downstream frame DL2 frame number is "1", and sequentially stores the new communication data in the frame number order.
In this way, the vehicle-mounted device 2 stores a plurality of communication data in the plurality of downlink frames DL2 so that the new communication data is transmitted in order.

In the following description of road-to-vehicle communication, the operating subjects are the optical beacon 4 and the in-vehicle device 2, but the actual communication control is performed by the beacon controller 7 of the optical beacon 4 and the in-vehicle controller 21 of the in-vehicle device 2. Run.

As shown in FIG. 5, the optical beacon 4 transmits a predetermined downlink frame DL1 in which the vehicle ID is not stored toward the road R from all the beacon heads 8 corresponding to the lanes R1 to R4 (see FIG. 2). It keeps sending in a cycle.
When the vehicle 20 traveling in any of the lanes R1 to R4 of the road R enters the downlink region DA, the vehicle-mounted device 2 receives the down frame in which the vehicle ID is not stored. As a result, the vehicle-mounted device 2 detects that the own vehicle has entered the communication area A of the optical beacon 4.

At this time, the on-board unit 2 generates an uplink frame in which the vehicle ID of the own vehicle is stored, temporarily switches the communication of the own device from reception to transmission, and uplink-transmits the uplink frame UL1 in which the vehicle ID is stored. After that, the vehicle-mounted device 2 returns the communication of its own device from transmission to reception.
When the on-board unit 2 has information to be provided to the optical beacon 4 such as travel time information, the in-vehicle device 2 stores the _{information as communication data D 0 in the uplink frame UL1.}

Upon receiving the uplink frame UL1, the optical beacon 4 acquires the vehicle ID stored in the uplink frame UL1 and starts transmitting the downlink frame DL2 storing the provision information to be provided to the vehicle-mounted device 2 such as traffic congestion information. ..

On the other hand, when the on-board unit 2 transmits _{the uplink frame UL2 constituting a plurality of frame groups in which the communication data D 1 to} D ₄ are stored after the uplink frame UL1 is transmitted, the transmission timing of the uplink frame UL1 and the uplink frame The reception system is set by providing a "transmission interruption period" (for example, a maximum of 20 ms) between the transmission timing of the UL2, and the downlink frame DL2 storing the vehicle ID is received during this transmission interruption period.

Upon receiving the downlink frame DL2, the vehicle-mounted device 2 determines whether or not the vehicle ID of the own vehicle is stored in the received downlink frame DL2.
If the above determination result is affirmative, the on-board unit 2 determines that communication with the optical beacon 4 has been established, and receives the communication status of its own unit until the above transmission interruption period elapses. Keep it as it is.
While the above determination result is negative, the on-board unit 2 determines that the communication with the optical beacon 4 has not been established, switches the communication state of the own unit from reception to transmission, and switches the uplink frame UL1. Resend.

When it is determined that the vehicle ID of the own vehicle is stored in the received downlink frame DL2, the vehicle-mounted device 2 starts transmitting the uplink frame UL2 after the transmission interruption period elapses.
The vehicle-mounted device 2 continuously transmits a plurality of uplink frames UL2 (uplink frame group) in which _{communication data D 1 to} D _{5 are stored at one time.} The vehicle-mounted device 2 is configured to transmit the uplink frame group only once after transmitting the uplink frame UL1.

The uplink frame group composed of a plurality of uplink frames UL2 continuously transmitted by the vehicle-mounted device 2 at one time is also hereinafter referred to as an uplink frame. Here, the case where the uplink frame is composed of an uplink frame group composed of a plurality of uplink frames UL2 is shown, but the uplink frame may be configured to include only one uplink frame UL2. ..
The uplink frame transmitted by the vehicle-mounted device 2 is received by the beacon head 8 of the optical beacon 4.

[About the first embodiment]
FIG. 6 is a block diagram showing the configurations of the beacon controller 7 and the central device 3 of the optical beacon 4 in the road-to-vehicle communication system according to the first embodiment.
As shown in FIG. 6, the beacon controller 7 of the present embodiment includes a communication device 30 for communicating with the central device 3 and a processing device 31.

The processing device 31 comprises a computer having a storage device such as a CPU and a memory, and has a function of performing control and the like related to the above-mentioned road-to-vehicle communication.
Further, the processing device 31 generates vehicle information by adding necessary information to the uplink frames given from the plurality of beacon heads 8 (first beacon head 81 and second beacon head 82), and generates vehicle information, and generates the vehicle information. It also has a function of giving to the central device 3. That is, the processing device 31 has a function of transferring the uplink frames from the plurality of beacon heads 8 to the central device 3.
The storage device of the processing device 31 stores a computer program for controlling road-to-vehicle communication and executing various processes performed by the optical beacon 4. By executing this computer program by the CPU of the processing device 31, various functions of the optical beacon 4 are realized.

The central device 3 includes a communication device 32 for communicating with the beacon controller 7 and a processing device 33.
The processing device 33 comprises a computer having a storage device such as a CPU and a memory, and has a function of generating a traffic index or the like based on various communication data including an uplink frame given from the optical beacon 4. That is, the central device 3 of the present embodiment constitutes a central control device (processing device) in which a communication frame is given from the beacon controller 7 (light emitting / receiver control device) that controls a plurality of beacon heads 8.

Further, the processing device 33 functionally has a deduplication processing unit 33a that processes a plurality of vehicle information including the same vehicle ID.
When a plurality of uplink frames including the same vehicle ID are acquired within a predetermined period, the deduplication processing unit 33a performs a process of eliminating duplication of communication data included in each of the plurality of uplink frames including the same vehicle ID. .. The detailed function of the deduplication processing unit 33a will be described later.

The storage device of the processing device 33 stores a computer program for executing various processes performed by the central device 3. By executing this computer program by the CPU of the processing device 33, the deduplication processing unit 33a of the central device 3 and various other functions of the central device 3 are realized.

FIG. 7 is a diagram showing an example of the contents of the uplink frame transmitted by the vehicle-mounted device 2 and the contents of the uplink frame when the beacon head of the optical beacon 4 receives the uplink frame.
As shown in FIG. 7, when the on-board unit 2 traveling on the road R transmits the downlink frame DL2 by the uplink optical UO, in addition to the first beacon head 81 installed in front of the own unit 2, it is adjacent to the first beacon head 81. The uplink optical UO of the vehicle-mounted device 2 may also reach the second beacon head 82 installed in the lane.

In this case, since both the beacon heads 81 and 82 receive the same uplink frame transmitted from one on-board unit 2, they receive the same uplink frame in duplicate.
The central device 3 of the present embodiment has a function of executing processing related to the case where the same uplink frame is received in duplicate in this way.

For example, it is assumed that the vehicle-mounted device 2 transmits an uplink frame as shown in FIG.
The uplink frame transmitted by the vehicle-mounted device 2 is composed of 16 uplink frames UL2 that are continuously transmitted at one time. Communication data D _{1 to} D ₁₆ are stored in the 16 uplink frames UL2.
As described above, the vehicle-mounted device 2 stores and transmits the new communication data in the uplink frame UL2 in order from the new communication data. Therefore, among the communication data D _{1 to} D ₁₆ , the newest communication data D ₁₆ is transmitted in the uplink frame UL2 of the frame number 1, and the oldest communication data D ₁ is transmitted in the uplink frame UL 2 of the frame number 16.

Here, it is assumed that both the first beacon head 81 and the second beacon head 82 of the optical beacon 4 receive the uplink frame transmitted by the vehicle-mounted device 2.
FIG. 7 shows an example of the uplink frame received by the first beacon head 81 and the uplink frame received by the second beacon head 82.
As shown in FIG. 7, in the uplink frame received by the first beacon head 81, the communication data stored in the frame numbers 2, 4 and 5 is missing, and the communication data stored in the other frame numbers is normally used. Has been received.
As for the uplink frame received by the second beacon head 82, only the communication data stored in the frame numbers 2, 5, 6, 12, 14, 15, and 16 is normally received.

As shown in FIG. 6, the first beacon head 81 and the second beacon head 82 give the received uplink frame to the beacon controller 7.
That is, two uplink frames in which the same vehicle ID is stored are given to the beacon controller 7.

When an uplink frame is given from each of the first beacon head 81 and the second beacon head 82, the beacon controller 7 uses both uplink frames as vehicle information (vehicle information of the first beacon head 81) as shown in FIG. And vehicle information of the second beacon head 82), which is given to the central device 3.

Here, when a plurality of vehicle information including the same vehicle ID is acquired within a predetermined period, the deduplication processing unit 33a of the central device 3 acquires the first of the plurality of vehicle information including the same vehicle ID. It has a function of processing vehicle information in the central device 3 and discarding other vehicle information.
The processing for vehicle information by the central device 3 is the above-mentioned traffic index generation processing and the like.

Further, during the above predetermined period, the central device 3 is the same when the first beacon head 81 and the second beacon head 82 each receive the same uplink frame UL2 (uplink frame) transmitted from one on-board unit 2. It is set based on the difference in acquisition timing when a plurality of vehicle information including the vehicle ID of the above is acquired. That is, the predetermined period is set based on the difference between the acquisition timing of the vehicle information of the first beacon head 81 and the acquisition timing of the vehicle information of the second beacon head 82 in the central device 3.

The difference in acquisition timing that occurs in the central device 3 is a slight difference in timing when both beacon heads 81 and 82 receive the uplink frame UL2, and the processing speeds of both beacon heads 81 and 82 and the beacon controller 7. Appears due to differences.
Specifically, the predetermined period is set to, for example, about several seconds to one minute.

As described above, since both the beacon heads 81 and 82 receive the same uplink frame transmitted from the one on-board unit 2, the uplink frame (uplink frame) and the first beacon head 81 of the first beacon head 81 are received. The same vehicle ID is stored in the uplink frame (uplink frame) of the 2 beacon head 82.

Therefore, the same vehicle ID is stored in the vehicle information of the first beacon head 81 and the vehicle information of the second beacon head 82.
Further, since both the beacon heads 81 and 82 receive the same uplink frame transmitted from one on-board unit 2, the central device 3 uses the vehicle information of the first beacon head 81 and the second beacon head 82. Vehicle information is acquired within the predetermined period.

Therefore, when the vehicle information of the first beacon head 81 and the vehicle information of the second beacon head 82 are given from the beacon controller 7 during the predetermined period, the deduplication processing unit 33a of the central device 3 uses the first beacon. It is determined that the vehicle ID included in the vehicle information of the head 81 and the vehicle information of the second beacon head 82 is the same, and the center of the vehicle information of the first beacon head 81 and the vehicle information of the second beacon head 82. The device 3 processes one vehicle information acquired first and discards the other vehicle information.

Assuming that the vehicle information of the first beacon head 81 is acquired by the central device 3 before the vehicle information of the second beacon head 82, the deduplication processing unit 33a centers the vehicle information of the first beacon head 81. The device 3 processes and discards the vehicle information of the second beacon head 82.

In this way, the deduplication processing unit 33a receives the ascending frame UL2 including the same vehicle ID for each beacon head 8, so that the central device 3 receives the ascending frame UL2 including the same vehicle ID within a predetermined period. Even if a plurality of data are acquired, duplication of communication data included in each of the plurality of uplink frames UL2 including the same vehicle ID can be eliminated.
As a result, it is possible to prevent the uplink frame UL2 containing the same communication data from the same vehicle-mounted device 2 from being duplicated and processed, and the uplink frame UL2 can be appropriately processed.

Further, in the present embodiment, the ascending frame UL2 is given to the central device 3 as vehicle information (uplink frame), and when the deduplication processing unit 33a acquires a plurality of vehicle information including the same vehicle ID, a plurality of them Of the vehicle information of, one vehicle information is processed and the other vehicle information is discarded. Therefore, it is easier to eliminate the duplication of communication data than to eliminate the duplication of communication data for each uplink frame UL2. can.

Further, in the present embodiment, the deduplication processing unit 33a processes one vehicle information acquired first by the central device 3 among a plurality of vehicle information including the same vehicle ID, and discards the other vehicle information. Therefore, among a plurality of vehicle information including the same vehicle ID, all the information acquired later can be discarded. As a result, the processing load related to deduplication of communication data can be reduced, and the processing becomes easy.

In the present embodiment, the destruction of information includes not only the case where the information is deleted but also the case where the information is not given to an apparatus or the like that performs the next stage processing.

FIG. 8 is a block diagram showing the configuration of the beacon controller 7 of the optical beacon 4 according to the modified example of the first embodiment.
This modification is different from the first embodiment in that the processing device 31 of the beacon controller 7 has the deduplication processing unit 31a.
When a plurality of uplink frames including the same vehicle ID are acquired within a predetermined period, the deduplication processing unit 31a of the beacon controller 7 of this modification is the most among the plurality of uplink frames including the same vehicle ID. It has a function to process the previously acquired uplink frame and discard other uplink frames.

The process for the uplink frame by the beacon controller 7 is a process for transferring the uplink frame as vehicle information to the central device 3.
That is, the beacon controller 7 of the present embodiment constitutes a light emitting / receiving device (processing device) that performs a process of transferring the uplink frame (uplink frame UL2) to the central device 3.

In this modification as well, as in the first embodiment, the first beacon head 81 and the second beacon head 82 each receive an uplink frame containing the same vehicle ID, whereby the beacon controller 7 (processing unit) When a plurality of uplink frames including the same vehicle ID are acquired within a predetermined period, the beacon controller 7 centralizes one uplink frame as vehicle information among the plurality of uplink frames including the same vehicle ID. Transfer to device 3. As a result, it is possible to prevent the central device 3 from duplicating and processing the same communication data from one on-board unit 2, and it is possible to appropriately process the vehicle information (uplink frame).

[About the second embodiment]
FIG. 9 is a diagram for explaining a mode of processing performed by the central device 3 of the second embodiment.
The configuration of the present embodiment is the same as that of the first embodiment, and the contents of the processing performed by the deduplication processing unit 33a are different.

When a plurality of vehicle information including the same vehicle ID is acquired within a predetermined period, the deduplication processing unit 33a of the present embodiment compares the communication data included in each of the plurality of vehicle information including the same vehicle ID with each other. It is configured to determine whether or not to discard the ascending frame UL2 included in a plurality of vehicle information including the same vehicle ID.

FIG. 9 shows a deduplication processing unit of the central device 3 when both the first beacon head 81 and the second beacon head 82 of the optical beacon 4 receive one uplink frame transmitted by the vehicle-mounted device 2 in FIG. 7. 33a shows the mode when processing.

In this case, the optical beacon 4 acquires the uplink frame received by the first beacon head 81 shown in FIG. 7 and the uplink frame received by the second beacon head 82, and the first beacon generated based on these is acquired. The vehicle information of the head 81 and the vehicle information of the second beacon head 82 are given to the central device 3.
As a result, the deduplication processing unit 33a of this modification acquires the vehicle information of the first beacon head 81 and the vehicle information of the second beacon head 82.

As shown in FIG. 9, the vehicle information of the first beacon head 81 has the same contents as the uplink frame received by the first beacon head 81 shown in FIG. 7, and is stored in the frame numbers 2, 4 and 5. The communication data that has been sent is missing, and the communication data stored in another frame number is being received normally.
The vehicle information of the second beacon head 82 has the same contents as the uplink frame received by the second beacon head 82 shown in FIG. 7, and the frame numbers are 2, 5, 6, 12, 14, 15, and 16. Only the stored communication data is normally received.

The vehicle information of the first beacon head 81 and the vehicle information of the second beacon head 82 each include the same vehicle ID, and as described in the first embodiment, the central device 3 has the vehicle information of the first beacon head 81 and the vehicle information. The vehicle information of the second beacon head 82 is acquired within the predetermined period.
Therefore, when the deduplication processing unit 33a of this modification acquires the vehicle information of the first beacon head 81 and the vehicle information of the second beacon head 82, the acquired vehicle information of the first beacon head 81 and the second beacon head 82 The ascending frames UL2 included in each of the vehicle information of the above are compared with each other.

The deduplication processing unit 33a compares the presence / absence and contents of the communication data included in each uplink frame UL2.
The deduplication processing unit 33a compares the uplink frames UL2 corresponding to each other in both vehicle information, and when the same communication data is included in both uplink frames UL2, the central device 3 retains the previously acquired one. Process and discard the other.
Further, when the deduplication processing unit 33a stores communication data in only one vehicle information of both uplink frames UL2 and the communication data is missing in the other uplink frame UL2, one of the uplinks is up. The central device 3 processes the communication data stored in the frame UL2.

_{For example, in FIG. 9, the same communication data D 11} , D ₅ , D ₃ , D ₂ , and D ₁ are stored in both vehicle information in the frame numbers 6, 12, 14, 15, and 16, respectively. Here, assuming that the vehicle information of the first beacon head 81 is acquired first, the deduplication processing unit 33a corresponds to the frame numbers 6, 12, 14, 15, and 16 in the vehicle information of the first beacon head 81. The frame UL2 (communication data stored in the frame UL2) is processed, and the upstream frame UL2 corresponding to the frame numbers 6, 12, 14, 15, and 16 in the vehicle information of the second beacon head 82 is discarded.

Further, in FIG. 9, in frame numbers 3, 7, _{8 , 9 , 10} , 11, and ₁₃ , communication data D 14, D 10, D 9, D 8, D _{7 are provided only for the vehicle information of the first beacon head 81.} , D ₆ and D ₄ are stored.
_{In frames 2 and 5, communication data D 15} and D ₁₂ are stored only in the vehicle information of the second beacon head 82.
In this case, the deduplication processing unit 33a processes the communication data D ₁₄ , D ₁₀ , D ₉ , D ₈ , D ₇ , D ₆ , D _{4 stored only in the vehicle information of the first beacon head 81. , The communication data D 15} and D ₁₂ stored only in the vehicle information of the second beacon head 82 are processed.

As a result, the deduplication processing unit 33a merges the vehicle information of the first beacon head 81 and the vehicle information of the second beacon head 82. As shown in FIG. 9, in the vehicle information after merging, only the frame number 4 is missing, and the communication data is aligned in the other frame numbers.
As a result, the deduplication processing unit 33a can eliminate duplication of communication data included in each of the plurality of uplink frames UL2 including the same vehicle ID.

As described above, when the deduplication processing unit 33a acquires a plurality of vehicle information (uplink frame UL2) including the same vehicle ID within a predetermined period, the plurality of vehicle information including the same vehicle ID is included in each of the plurality of vehicle information. It is configured to merge a plurality of vehicle information while comparing communication data with each other and deciding whether or not to discard the uplink frame in units of uplink frames UL2 based on the comparison result.
In this modification, since it is determined whether or not to discard each uplink frame UL2, it is possible to reduce the communication data that is wasted.

In the present embodiment, the case where the deduplication processing unit 33a of the central device 3 executes the above processing is illustrated, but as shown in the modified example of the first embodiment, the beacon controller 7 performs the deduplication processing. When the unit 31a is provided, the deduplication processing unit 31a of the beacon controller 7 can also execute the above processing.

[About the third embodiment]
FIG. 10 is a block diagram showing a configuration of a road-to-vehicle communication system according to a third embodiment.
The present embodiment is different from the first embodiment in that the deduplication processing unit 33a of the central device 3 processes vehicle information given from the plurality of optical beacons 4.

In FIG. 10, the optical beacon 4A and the optical beacon 4B are connected to the central device 3. The beacon head 8A of the optical beacon 4A and the beacon head 8B of the optical beacon 4B are installed at different positions from each other. For example, the beacon head 8B is installed on the downstream side of the same road where the beacon head 8A is installed.
Therefore, one on-board unit 2 normally communicates with the beacon head 8A and then communicates with the beacon head 8B.

FIG. 11 is a diagram showing an example of the contents of the uplink frame transmitted by the vehicle-mounted device 2 and the contents of the vehicle information acquired by the central device 3 when the beacon head of the optical beacon 4 receives the uplink frame. ..

In FIG. 11, one on-board unit 2 transmits an uplink frame to the beacon head 8A of the optical beacon 4A installed on the road R, and then the beacon of the optical beacon 4B installed on the downstream side of the beacon head 8A. An example of the contents of the uplink frame and the contents of the vehicle information when the uplink is advanced to the head 8B and the uplink frame is transmitted to the beacon head 8B is shown.

In the uplink frame transmitted by the vehicle-mounted device 2 toward the beacon head 8A, communication data D _{1 to} D ₁₆ are stored in 16 uplink frames UL2.
Further, in the uplink frame transmitted by the same vehicle-mounted device 2 toward the beacon head 8B, communication data D _{11 to} D ₂₆ are stored in 16 uplink frames UL2.
As described above, in the communication data _D 1 _{to D 26,} the communication data _{D 1} is the oldest, the communication data _{D 26} is the most recent communication data.

Here, the uplink frame transmitted by the vehicle-mounted device 2 toward the beacon head 8B includes _{communication data D 11 to} D _{16 previously transmitted toward the beacon head 8A.} That is, the vehicle-mounted device 2 _{transmits the communication data D 11 to} D ₁₆ in duplicate.
This is due to the processing when the vehicle-mounted device 2 stores each communication data in the uplink frame UL2.

FIG. 12A is a diagram for explaining an example of processing when the vehicle-mounted device 2 stores the communication data in the uplink frame UL2, and is a diagram when the vehicle-mounted device 2 transmits the _{communication data D 1 to} D _16. An example is shown.
As shown in FIG. 12A, the vehicle-mounted device 2 has a storage area for storing communication data to be stored in the uplink frame UL2 in the storage device of the own device 2.
This storage area includes an area corresponding to frame numbers 1 to 16 of 16 uplink frames UL2 that can be transmitted as uplink frames.

Vehicle device 2, when generating the communication data _D 1 _{to D 16} as the data to be transmitted to the optical beacon 4, the oldest communication data _{D 1} in the communication data _D 1 _{to D 16} in the region corresponding to the frame number 16 It is stored and sequentially stored so that the newest communication data D _{16 among the communication data D 1 to} D ₁₆ is stored in the area corresponding to the frame number 1.
When the vehicle-mounted device 2 stores the communication data in each of the areas corresponding to the frame numbers 1 to 16, the communication data stored in the areas corresponding to the frame numbers 1 to 16 is stored in the uplink frame UL2 and used as an uplink frame. Send.

The on-board unit 2 is configured to _{retain the communication data D 1 to} D ₁₆ stored in the storage area even after being transmitted as an uplink frame, and to overwrite and update the communication data D 1 to D 16 by the first-in first-out method when new communication data is generated. ing.

Therefore, for example, when communication data D _{1 to} D ₁₆ are transmitted as an uplink frame and then communication data D _{17 to} D ₂₆ are newly generated, the vehicle-mounted device 2 has a storage area as shown in FIG. 12 (b). Of the communication data D _{1 to} D ₁₆ stored in, the old communication data D _{1 to} D ₁₀ are discarded, and the communication data D _{11 to} D ₁₆ are moved to the area corresponding to the frame numbers 11 to 16. Further, the vehicle-mounted device 2 stores new communication data D _{17 to} D ₂₆ in the area corresponding to the frame numbers 1 to 10.

The vehicle-mounted device 2 stores these communication data in the uplink frame UL2 and transmits the communication data as an uplink frame.
Then, the communication data D _{11 to} D ₁₆ will be transmitted in duplicate.
As described above, the vehicle-mounted device 2 may transmit the communication data in duplicate due to the processing when the communication data is stored in the uplink frame UL2.

When the vehicle-mounted device 2 _{transmits the communication data D 11 to} D ₁₆ in duplicate, the communication data D _{11 to} D ₁₆ are received by both the beacon head 8A of the optical beacon 4A and the beacon head 8B of the optical beacon 4B. become.

In this case, the central device 3 is provided with the vehicle information of the optical beacon 4A and the vehicle information of the optical beacon 4B as shown in FIG.

When a plurality of vehicle information including the same vehicle ID is given within a predetermined period, the deduplication processing unit 33a of the present embodiment includes the ascending frame UL2 included in each of the plurality of vehicle information including the same vehicle ID. When a plurality of uplink frames UL2 containing the same communication data are included, the first uplink frame UL2 acquired first among the plurality of uplink frames UL2 containing the same communication data is processed and the other uplink UL2 is used. It has a function to discard.

The predetermined period in the present embodiment is set to, for example, several hours to several days because the route from the passage of the vehicle-mounted device 2 through the beacon head 8A to the passage of the beacon head 8B cannot be specified. NS.

As described above, since the beacon heads 8A and 8B receive the uplink frame transmitted from one on-board unit 2, the uplink frame (uplink frame) of the beacon head 8A and the uplink of the beacon head 8B are received. The same vehicle ID is stored in the frame (uplink frame).
Therefore, the same vehicle ID is stored in the vehicle information of the optical beacon 4A and the vehicle information of the optical beacon 4B.

Therefore, when the vehicle information of the optical beacon 4A and the vehicle information of the optical beacon 4B are given during the predetermined period, the deduplication processing unit 33a of the central device 3 receives the vehicle information of the optical beacon 4A and the vehicle of the optical beacon 4B. It is determined that the vehicle IDs included in the information are the same, and the communication data in the uplink frame UL2 included in the vehicle information of the first beacon head 81 and the vehicle information of the second beacon head 82 are compared. As a result of comparison, when a plurality of the same communication data are included, the deduplication processing unit 33a processes the uplink frame UL2 (communication data) included in the vehicle information of the optical beacon 4A acquired earlier, and the optical beacon 4B The upstream frame UL2 (communication data) included in the vehicle information of is discarded.

_{Therefore, the deduplication processing unit 33a processes the communication data D 11 to} D ₁₆ included in the vehicle information of the optical beacon 4A previously acquired, and discards the _{communication data D 11 to} D ₁₆ included in the vehicle information of the optical beacon 4B. do.
Thereby, also in the present embodiment, it is possible to eliminate duplication of communication data included in each of the plurality of uplink frames UL2 including the same vehicle ID. As a result, it is possible to prevent the same communication data from one vehicle-mounted device 2 from being duplicated and processed, and it is possible to appropriately process the vehicle information (uplink frame).

In the present embodiment, the deduplication processing unit 33a shows a case where the ascending frame UL2 is compared between the vehicle information including the same vehicle ID, but since each ascending frame UL2 includes the vehicle ID, the vehicle ID is included. The deduplication processing unit 33a may determine whether or not the vehicle IDs are the same between the upstream frames UL2 regardless of the vehicle information, and compare the communication data stored in these.

〔others〕
It should be noted that the embodiments disclosed this time are exemplary in all respects and are not considered to be restrictive.
For example, in the first embodiment, when the deduplication processing unit 33a of the central device 3 acquires a plurality of vehicle information including the same vehicle ID within a predetermined period, among the plurality of vehicle information including the same vehicle ID. Although the case where the vehicle information acquired first is processed by the central device 3 and the other vehicle information is discarded is illustrated, the vehicle information acquired the latest during the predetermined period is processed by the central device 3 and processed. It may be configured to discard other vehicle information.

Further, in the third embodiment, when the deduplication processing unit 33a is given a plurality of vehicle information including the same vehicle ID within a predetermined period, the data is included in each of the plurality of vehicle information including the same vehicle ID. When the communication data of the frame UL2 is compared and a plurality of uplink frames UL2 containing the same communication data are included, the first uplink frame UL2 acquired among the plurality of uplink frames UL2 containing the same communication data is included. The case where the other uplink frame UL2 is discarded by processing the above is illustrated, but the uplink frame UL2 acquired the latest during the predetermined period is processed by the central device 3 and the other uplink frame UL2 is discarded. You may.

The scope of the present invention is indicated by the scope of claims, not the above-mentioned meaning, and is intended to include the meaning equivalent to the scope of claims and all modifications within the scope.

1 Traffic control system 2 On-board unit 3 Central device 4,4A, 4B Optical beacon 5 Communication line 7,7A, 7B Beacon controller 8,8A, 8B Beacon head 10 Optical transmitter 11 Optical receiver 13 Pillar 14 Elevated bar 20 Vehicle 21 On-board controller 22 On-board head 23 Optical transmitter 24 Optical receiver 30 Communication device 31 Processing device 31a Deduplication processing unit 32 Communication device 33 Processing device 33a Deduplication processing unit 81 1st beacon head 82 2nd beacon head

Claims (8)

Multiple light emitting and receiving devices that set different communication areas on the road,
A processing device, which is provided with a communication frame from an in-vehicle device received by the plurality of light emitting and receiving devices and performs a predetermined process on the communication frame, is provided.
The processing device is
When a plurality of the communication frames including the same vehicle ID are acquired within a predetermined period, communication provided with a deduplication unit for eliminating duplication of communication data included in each of the plurality of communication frames including the same vehicle ID. Data processing system. The communication frame is given to the processing device as a communication frame group including the plurality of the communication frames.
The deduplication section
A claim that when a plurality of the communication frame groups including the same vehicle ID are acquired, the predetermined processing is executed for one communication frame group among the plurality of communication frame groups, and the other communication frame group is discarded. The communication data processing system according to 1. The deduplication unit according to claim 2, wherein the communication frame group acquired first among the plurality of communication frame groups including the same vehicle ID is used as the one communication frame group to execute the predetermined process. Communication data processing system. The deduplication unit compares the communication data included in each of the plurality of communication frames including the same vehicle ID with each other, and discards each of the plurality of communication frames including the same vehicle ID based on the comparison result. The communication data processing system according to claim 1, which determines whether or not. The predetermined period is based on the difference in acquisition timing when the processing device acquires a plurality of the communication frames including the same vehicle ID when each of the plurality of light emitting / receiving receivers receives the same communication frame. The communication data processing system according to any one of claims 1 to 4, which is set. The processing device is a central control device to which the communication frame is given from the light emitting / receiving device controlling device that controls the plurality of light emitting / receiving devices.
The communication data processing system according to any one of claims 1 to 5, wherein the predetermined processing is generation of a traffic index using vehicle information included in the communication frame. The processing device is a light emitting / receiving control device that controls the plurality of light emitting / receiving devices.
The communication data processing system according to any one of claims 1 to 5, wherein the predetermined process is a transfer of the communication frame to a central control device connected to the light receiving / receiving control device. Multiple optical beacons that wirelessly communicate with the on-board unit of a moving vehicle using optical signals,
A communication frame from the vehicle-mounted device received by the plurality of optical beacons is given, and a central control device that performs predetermined processing on the communication frame information is provided.
The central control device
When a plurality of the communication frames including the same vehicle ID are acquired within a predetermined period, communication provided with a deduplication unit for eliminating duplication of communication data included in each of the plurality of communication frames including the same vehicle ID. Data processing system.

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