JP2018206272A - 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-vehicle communication system, so-called VICS (Vehicle Information and Communication System: registered trademark of the Road Traffic Information Communication System Center) using optical beacons, radio beacons or FM multiplex broadcasting has already been developed. ing.
Among these, the optical beacon employs optical communication using near infrared rays as a communication medium, and is capable of bidirectional communication with the in-vehicle device. Specifically, information including travel time information between beacons held by the vehicle is transmitted from the in-vehicle device to the optical beacon on the infrastructure side.

Conversely, downlink information including traffic jam information, section travel time information, event regulation information, lane notification information, and the like is transmitted from the optical beacon to the in-vehicle device (see, for example, Patent Document 1).
For this reason, the optical beacon includes an optical communication device (hereinafter also referred to as “beacon head”) for performing optical communication with the vehicle-mounted device for each lane.

JP 2005-268925 A

Optical communication between the in-vehicle device and the optical beacon is performed according to the following procedure. That is, when the vehicle-mounted device enters an area that can communicate with an optical beacon (beacon head) on the road, the in-vehicle device transmits an uplink frame including its own ID as information to the beacon head as an optical signal. When the beacon head receives the upstream frame, the beacon head transmits the downstream frame including the ID of the vehicle-mounted device to the vehicle-mounted device as an optical signal.
When the in-vehicle device receives the down 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 the communication data such as the probe information of the own device together with the ID of the own device. It is stored in the frame and transmitted to the beacon head as an uplink frame.

Here, when an optical beacon is installed on a road with a plurality of lanes and includes a plurality of beacon heads corresponding to the plurality of lanes, the optical beacon is one in-vehicle device for each of the plurality of beacon heads. May receive the same upstream frame transmitted from.
In this case, the optical beacon receives the same communication data transmitted from one in-vehicle device in duplicate.

Further, as described above, the in-vehicle device stores the communication data in the uplink frame and generates an uplink frame.
At this time, the in-vehicle device is configured to store a plurality of pieces of communication data to be stored in a plurality of frames in a memory adopting, for example, a first-in first-out method, and to read out the communication data from the memory and store it in the plurality of frames Sometimes.
In such a configuration, if new communication data is not sufficiently supplied to the memory, the communication data that has been transmitted 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 can be considered.
In this case, the same communication data transmitted from the same in-vehicle device is received redundantly by different optical beacons.

  As described above, when the same communication data transmitted from the same in-vehicle device is received redundantly, the optical beacon or the processing unit that processes the communication data received by the optical beacon overlaps the exact same data. Since it processes, there exists a possibility that an appropriate process 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 vehicle-mounted device is received repeatedly. The purpose is to do.

  A communication data processing system according to an embodiment is provided with a plurality of projectors / receivers that set different communication areas on a road, and a communication frame from an in-vehicle device received by the plurality of projectors / receivers. A processing device that performs predetermined processing on the communication device, and when the processing device acquires a plurality of the communication frames including the same vehicle ID within a predetermined period, the plurality of communication including the same vehicle ID A deduplication unit that eliminates duplication of communication data included in each frame is provided.

  The communication data processing system according to an embodiment includes a plurality of optical beacons that perform wireless communication with an in-vehicle device of a traveling vehicle using an optical signal, and a communication frame from the in-vehicle device that is received by the plurality of optical beacons. And a central control device that performs a predetermined process on the communication frame information, and the central control device, when acquiring a plurality of communication frames including the same vehicle ID within a predetermined period, A duplication elimination unit that eliminates duplication of communication data included in each of the plurality of communication frames including the vehicle ID.

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

FIG. 1 is a block diagram illustrating an overall configuration of a road-vehicle communication system (communication data processing system) according to an embodiment. FIG. 2 is a plan view of the road R when the optical beacon installation portion 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 illustrating a configuration of an uplink frame. FIG. 5 is a sequence diagram illustrating 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 controller and a central device in the road-vehicle communication system according to the first embodiment. FIG. 7 is a diagram illustrating an example of the content of the uplink frame transmitted by the in-vehicle device 2 and the content of the uplink frame when the beacon head of the optical beacon receives this uplink frame. FIG. 8 is a block diagram showing a configuration of an optical beacon controller according to a modification 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-vehicle communication system according to the third embodiment. FIG. 11 is a diagram illustrating an example of the content of the uplink frame transmitted by the in-vehicle device and the content of the vehicle information acquired by the central device when the beacon head of the optical beacon receives this uplink frame. FIG. 12A is a diagram for explaining an example of processing when the in-vehicle device stores the communication data in the uplink frame, and shows an example when the in-vehicle device transmits the communication data. FIG. 12B is a diagram illustrating an example of processing when new communication data is generated after FIG.

[Description of Embodiment]
First, the contents of the embodiment will be listed and described.
(1) A communication data processing system according to an embodiment is provided with a plurality of projectors and receivers that set different communication areas on a road, and a communication frame from an in-vehicle device received by the plurality of projectors and receivers, A processing device that performs predetermined processing on the communication frame, and the processing device includes a plurality of the same vehicle IDs when the plurality of communication frames including the same vehicle ID are acquired within a predetermined period. A duplication elimination unit that eliminates duplication of communication data included in each of the communication frames.

  According to the communication data processing system configured as described above, when each of the plurality of projectors and receivers receives the same communication frame, 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 redundant processing of communication frames including the same communication data from the same in-vehicle device. The communication frame can be appropriately processed.

(2) In the communication data processing system, when the communication frame is provided to the processing device as a communication frame group including a plurality of communication frames, the deduplication unit includes a plurality of the communication including the same vehicle ID. When a frame group is acquired, it is preferable that the predetermined process is executed for one communication frame group among the plurality of communication frame groups, and the other communication frame group is discarded.
In this case, duplication of communication data can be more easily eliminated than elimination of 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.
In this case, all of the plurality of communication frame groups including the same vehicle ID acquired later can be discarded. As a result, it is possible to reduce the processing load related to communication data de-duplication and to facilitate the processing.

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

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

(6) In the communication data processing system, the processing device is a central control device to which the communication frame is given from a projector / receiver control device that controls the plurality of projectors / receivers. It may be the generation of a traffic index using vehicle information included in the frame.

(7) In the communication data processing system, the processing device is a projector / receiver control device that controls the plurality of projectors / receivers, and the predetermined processing is performed by using the communication frame as the projector / receiver control device. Transfer to a central control unit connected to the.

(8) A communication data processing system according to an embodiment includes a plurality of optical beacons that perform wireless communication with an in-vehicle device of a traveling vehicle using an optical signal, and a communication frame from the in-vehicle device received by the plurality of optical beacons. And a central control device that performs predetermined processing 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, A deduplication unit that eliminates duplication of communication data included in each of the plurality of communication frames including the same vehicle ID is provided.

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

[Overall system configuration]
FIG. 1 is a block diagram illustrating an overall configuration of a road-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 an infrastructure-side traffic control system 1 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 at various locations on the road R. The optical beacon 4 can perform wireless communication with the in-vehicle device 2 by optical communication using near infrared as a communication medium.
The optical beacon 4 includes a beacon controller 7 that performs communication control and the like, and a plurality (four in the example of FIG. 1) of beacon heads (projector / receiver) 8 connected to the beacon controller 7.

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

The optical beacon 4 of this embodiment employs a full-duplex communication method. That is, the beacon controller 7 simultaneously performs transmission control in the downlink direction when transmitting an optical signal toward the vehicle-mounted device 2 and reception control in the uplink direction when receiving the optical signal from the vehicle-mounted device 2. .
On the other hand, the in-vehicle device 2 employs a half-duplex communication method. That is, the vehicle-mounted 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 an optical signal from the optical beacon 4. Direction reception control is not performed at the same time.

  The beacon head 8 of the optical beacon 4 receives the optical communication optical transmitter 10 that transmits the downlink light DO (see FIG. 3) that is an optical signal and the uplink optical UO (see FIG. 3) that is an optical signal. And an optical receiver 11 for optical communication that converts it into an electrical signal.

The optical transmission unit 10 includes a light emitting element including a light emitting diode (LED) and includes a transmission circuit that converts a transmission signal provided from the beacon controller 7 into an optical signal in a downlink direction.
The light emitting element of the optical transmission unit 10 transmits the downlink light DO, which is a near-infrared optical signal, obliquely downward toward the upstream side. Thereby, the optical transmission part 10 of the beacon head 8 transmits the communication signal transmitted to the vehicle equipment 2 by an optical signal.

The light receiving unit 11 includes a light receiving element such as a photodiode (PD), and includes a receiving circuit that generates a digital communication signal from an electric signal output from 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 before the beacon head 8, and converts it into an electrical signal. The receiving circuit of the optical receiver 11 acquires the communication signal transmitted from the in-vehicle device 2 from the converted electric signal. The receiving circuit sends the acquired communication signal to the beacon controller 7. Thereby, the optical receiver 11 of the beacon head 8 receives the optical signal transmitted by the in-vehicle device 2 as a communication signal.

  The beacon controller 7 performs 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 performs communication 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 in-vehicle device 2 in a downlink frame that is a predetermined communication frame, and gives this to the beacon head 8 as a communication signal. The beacon controller 7 transmits communication data to the in-vehicle device 2 by causing the beacon head 8 to transmit this communication signal.

  In addition, when a beacon controller 7 receives a communication signal from the in-vehicle device 2 from the beacon head 8, the beacon controller 7 acquires an upstream frame storing various types of communication data. Further, the beacon controller 7 performs a process of transferring the acquired upstream frame to the central device 3.

When the various communication data stored in the upstream frame from the in-vehicle device 2 is given from the beacon controller 7, the central device 3 uses the vehicle information such as probe information included in the given various communication data to make a traffic index. And so on.
The central device 3 also has a function of giving the generated traffic index to the in-vehicle device 2 via the optical beacon 4.

[Installation status and communication area of optical beacons]
FIG. 2 is a plan view of the road R when the installation portion of the optical beacon 4 of this 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 (four in the illustrated example) of lanes R1 to R4 in the same direction.
The optical beacon 4 includes a plurality of the beacon heads 8 provided corresponding to the respective lanes R <b> 1 to R <b> 4 and one beacon controller 7 that collectively controls these beacon heads 8.

The beacon controller 7 is installed on a support column 13 standing on the side of the road. Each beacon head 8 is attached to an erection bar 14 installed horizontally on the road R side from the support column 13 and is arranged immediately above the center position of each lane R1 to R4.
The light transmission unit 10 of the beacon head 8 emits the downlink signal DL toward the upstream side in the vehicle traveling direction from directly below the own aircraft. Thereby, 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 includes a downlink area DA (a hatched portion indicated by a solid line in FIG. 3), which is a range in which the in-vehicle device 2 can receive the downlink signal DL, and a beacon head 8. It is composed of an uplink area UA (a hatched portion indicated by a broken line in FIG. 3) UA, which is a light receiving range of the link signal UL.

The downlink area DA is a range indicated by Δdac whose apexes are the light emitting / receiving position d of the beacon head 8 and the positions a and c at a height of 1 m above the ground.
The uplink area UA is a range indicated by Δdbc with the light emitting / receiving position d of the beacon head 8 and 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 in-vehicle device 2 of the present embodiment includes an in-vehicle controller 21 and an in-vehicle head 22, and an optical transmitter 23 and an optical receiver 24 are accommodated in the in-vehicle head 22. ing.
Among these, the optical transmitter 23 has a light emitting element that emits uplink light UO (an optical signal in the uplink direction) made of near infrared rays. The optical receiver 24 has a light receiving element that receives downlink light DO (optical signal in the downlink direction) made of near infrared rays.

The optical transmission unit 23 includes a light emitting element including a light emitting diode, and includes a transmission circuit that converts a communication signal provided from the in-vehicle controller 21 into an optical signal in the uplink direction.
The light emitting element of the optical transmitter 23 transmits the uplink light UO, which is a near-infrared optical signal, toward the front side. Thereby, the optical transmission part 23 transmits the communication signal transmitted to the optical beacon 4 with an optical signal.

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

The in-vehicle controller 21 includes a computer having a CPU (Central Processing Unit) and a storage device such as a memory, and has a function of performing control related to 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 a control function related to road-to-vehicle communication is realized by the CPU reading and executing this program.

The in-vehicle controller 21 has a function of performing road-to-vehicle communication with the optical beacon 4 via the optical transmitter 23 and the optical receiver 24.
The in-vehicle controller 21 stores communication data to be transmitted to the optical beacon 4 in an upstream frame that is a predetermined communication frame, and supplies this to the optical transmission unit 23 as a communication signal. The in-vehicle controller 21 transmits the communication signal to the optical beacon 4 by causing the optical transmitter 23 to transmit the communication signal.
Moreover, when the communication signal from the optical beacon 4 is given from the optical receiver 24, the in-vehicle controller 21 acquires various communication data stored in the downlink frame of this communication signal, and performs necessary processing.
Moreover, the vehicle-mounted controller 21 produces | generates the probe information (traveling track data which arranged the passage position and the passage time in time series) etc. as communication data, and stores probe information in an upstream frame, The optical transmission part 23 also has a function of transmitting to the optical beacon 4 via

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

  In the upstream frame, 1 byte is assigned to the synchronization part, 10 bytes are assigned to the header part, 59 bytes at maximum are assigned to the real data part, and 4 bytes (1 byte idle part + 2 bytes CRC + 1 byte) are assigned to the CRC part. Of the last synchronization part).

The header portion of the upstream frame includes a storage area for the vehicle ID and final frame flag of the in-vehicle device 2 that is the transmission source.
The last frame flag is information for indicating which is the last frame among one or a plurality of uplink frames transmitted by the in-vehicle device 2.
For example, when continuously transmitting a plurality of upstream frames, the in-vehicle device 2 stores a predetermined flag value (for example, “1”) as a final frame flag only in the “final frame flag” of the last upstream frame. The flag value is not stored in other upstream frames. In addition, when the in-vehicle device 2 transmits only one uplink frame, the in-vehicle device 2 stores a flag value in the uplink frame.

In the actual data part, communication data such as probe information is stored.
The in-vehicle controller 21 stores the vehicle ID of the own device 2 and communication data such as probe information in the uplink 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 illustrating an example of road-to-vehicle communication performed in the communication area A.
In FIG. 5, a downlink frame DL1 is a downlink frame that is repeatedly transmitted by the optical beacon 4 in an initial state before low-speed uplink reception.
The downlink frame DL2 is a downlink frame that the optical beacon 4 repeatedly transmits after receiving the uplink.

The upstream frame UL1 is an upstream frame transmitted by the in-vehicle device 2 in response to the reception of the downstream frame DL1.
The upstream frame UL2 is an upstream frame that is transmitted by the in-vehicle device 2 in response to the reception of the downstream 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 communication data stored in the uplink frame UL 1 that is transmitted by the in-vehicle device 2 through uplink.
D ₁ to D ₅ illustrates a plurality of communication data stored in the upstream frame UL2 vehicle device 2 transmits uplink. Note that the number shown above each communication data D is the frame number of the upstream frame UL2 for continuous transmission at a time.
FIG. 5 illustrates the case where the number of uplink frames transmitted continuously is five, but the number of frames is not limited to five. For example, the upstream frame group may be composed of 6 or more (maximum 16 frames in the standard).

The numbers assigned to the communication data D _{1 to} D ₅ indicate the order in which the communication data are generated. The smaller the number value, the more the communication data has been 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 frame numbers having 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.
As described above, the in-vehicle device 2 stores a plurality of pieces of communication data in a plurality of downlink frames DL2 so that new communication data are sequentially transmitted.

  In the following description of road-to-vehicle communication, the operation main body is 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 the 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 transmitting at a cycle.
When the vehicle 20 traveling on one of the lanes R1 to R4 on the road R enters the downlink area DA, the in-vehicle device 2 receives a downlink frame in which the vehicle ID is not stored. Thereby, the vehicle equipment 2 detects that the own vehicle has entered the communication area A of the optical beacon 4.

At this time, the in-vehicle device 2 generates an uplink frame storing the vehicle ID of the host vehicle, switches the communication of the host device from reception to transmission once, and uplink transmits the uplink frame UL1 storing the vehicle ID. Thereafter, the vehicle-mounted device 2 returns its own communication from transmission to reception.
Vehicle device 2, when there is information to be provided on the light beacon 4, such as travel time information, the uplink frame UL1, stores the information as the communication data D _0.

  When receiving the upstream frame UL1, the optical beacon 4 acquires the vehicle ID stored in the upstream frame UL1, and starts transmission of the downstream frame DL2 in which provision information to be provided to the in-vehicle device 2 such as traffic jam information is stored. .

On the other hand, the vehicle-mounted device 2, after transmitting uplink frames UL1, when transmitting an uplink frame UL2 constituting a plurality of frame group communication data D ₁ to D ₄ is stored, the transmission timing and uplink frame of the uplink frame UL1 By providing a “transmission interruption period” (for example, a maximum of 20 ms) between the transmission timing of UL2 and receiving, the downlink frame DL2 storing the vehicle ID is received during this transmission interruption period.

When receiving the downlink frame DL2, the in-vehicle device 2 determines whether or not the vehicle ID of the host vehicle is stored in the received downlink frame DL2.
If the determination result is affirmative, the in-vehicle device 2 determines that communication with the optical beacon 4 has been established, and receives the communication state of the own device until the transmission interruption period elapses. Keep it.
While the above determination result is negative, the in-vehicle device 2 determines that communication with the optical beacon 4 is not established, switches the communication state of the own device from reception to transmission, and transmits the uplink frame UL1. Will be resent.

If it is determined that the vehicle ID of the host vehicle is stored in the received downlink frame DL2, the in-vehicle device 2 starts transmitting the uplink frame UL2 after the transmission interruption period has elapsed.
Vehicle unit 2, a plurality of uplink frame communication data D ₁ to D ₅ is stored UL2 (up frame group) to continuously transmit at a time. The in-vehicle device 2 is configured to transmit the upstream frame group only once after transmitting the upstream frame UL1.

Hereinafter, an uplink frame group composed of a plurality of uplink frames UL2 transmitted continuously by the in-vehicle device 2 at a time is also referred to as an uplink frame. In addition, although the case where the uplink frame is configured by an uplink frame group including a plurality of uplink frames UL2 is shown here, the uplink frame may be configured to include only one uplink frame UL2. .
The uplink frame transmitted by the in-vehicle device 2 is received by the beacon head 8 of the optical beacon 4.

[About the first embodiment]
FIG. 6 is a block diagram illustrating configurations of the beacon controller 7 of the optical beacon 4 and the central device 3 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 includes a computer having a storage device such as a CPU and a memory, and has a function of performing control related to the road-to-vehicle communication described above.
Moreover, the processing apparatus 31 produces | generates vehicle information by adding required information to the uplink frame given from several beacon heads 8 (1st beacon head 81 and 2nd beacon head 82), This vehicle information is produced | generated. It also has a function to be given to the central device 3. That is, the processing device 31 has a function of transferring uplink frames from a plurality of beacon heads 8 to the central device 3.
The storage device of the processing device 31 stores a computer program for executing control related to road-to-vehicle communication and various processes performed by the optical beacon 4. Various functions of the optical beacon 4 are realized by the CPU of the processing device 31 executing this computer program.

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 includes a computer having a CPU and a storage device such as a memory, and has a function of performing processing for generating a traffic index and the like based on various communication data including an uplink frame provided from the optical beacon 4. That is, the central device 3 of this embodiment constitutes a central control device (processing device) to which a communication frame is given from a beacon controller 7 (projector / receiver control device) that controls a plurality of beacon heads 8.

Moreover, the processing apparatus 33 has functionally the de-duplication processing part 33a which performs the process with respect to the several vehicle information containing 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 other various functions of the central device 3 are realized.

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

In this case, since both beacon heads 81 and 82 have received the same uplink frame transmitted from one vehicle-mounted device 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.

For example, it is assumed that the in-vehicle device 2 transmits an uplink frame as shown in FIG.
The uplink frame transmitted by the in-vehicle device 2 is composed of 16 uplink frames UL2 that are continuously transmitted at a time. Communication data D _{1 to} D ₁₆ are stored in the ₁₆ upstream frames UL2.
Note that the in-vehicle device 2 stores and transmits in the upstream frame UL2 in order from the new communication data as described above. Therefore, among the communication data D _{1 to} D ₁₆ , the newest communication data D ₁₆ is transmitted in the uplink frame UL 2 with the frame number 1, and the oldest communication data D ₁ is transmitted with the uplink frame UL 2 with 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 have received the uplink frame transmitted by the in-vehicle 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 at this time.
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 are lost, and the communication data stored in the other frame numbers are normal. Has been received.
In 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 are normally received.

As shown in FIG. 6, the first beacon head 81 and the second beacon head 82 give the uplink frame received together 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 converts both uplink frames into vehicle information (vehicle information of the first beacon head 81) as shown in FIG. And the vehicle information of the second beacon head 82).

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 earliest among the plurality of vehicle information including the same vehicle ID. The central device 3 has a function of processing vehicle information and discarding other vehicle information.
In addition, the process with respect to the vehicle information by the central apparatus 3 is the above-described traffic index generation process or the like.

  Further, during the 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 in-vehicle device 2. It is set based on the difference in acquisition timing when a plurality of vehicle information including the vehicle ID is acquired. That is, the predetermined period is set based on the difference between the vehicle information acquisition timing of the first beacon head 81 in the central device 3 and the vehicle information acquisition timing of the second beacon head 82.

The difference in the acquisition timing that occurs in the central device 3 is a slight difference in timing when both the beacon heads 81 and 82 receive the upstream frame UL2, respectively, and the processing speed in both the 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 beacon heads 81 and 82 have received the same uplink frame transmitted from one vehicle-mounted device 2, the uplink frame (upstream frame) of first beacon head 81 and the first frame The same vehicle ID is stored in the uplink frame (the upstream frame) of the two beacon heads 82.

Accordingly, the same vehicle ID is also stored in the vehicle information of the first beacon head 81 and the vehicle information of the second beacon head 82.
Since both beacon heads 81 and 82 receive the same uplink frame transmitted from one in-vehicle device 2, the central device 3 determines 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 It is determined that the vehicle IDs included in the vehicle information of the head 81 and the vehicle information of the second beacon head 82 are 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 is the center. The apparatus 3 processes the first vehicle information acquired first, and discards the other vehicle information.

  If 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 sets the vehicle information of the first beacon head 81 to the center. Processing is performed in the device 3, and the vehicle information of the second beacon head 82 is discarded.

In this way, the deduplication processing unit 33a receives the upstream frame UL2 including the same vehicle ID by each beacon head 8 so that the central device 3 transmits the upstream frame UL2 including the same vehicle ID within a predetermined period. Even if multiple acquisitions are made, duplication of communication data included in each of the multiple upstream frames UL2 including the same vehicle ID can be eliminated.
As a result, it is possible to prevent the upstream frame UL2 including the same communication data from the same in-vehicle device 2 from being processed in duplicate, and the upstream frame UL2 can be appropriately processed.

  In the present embodiment, the uplink frame UL2 is given to the central device 3 as vehicle information (uplink frame), and the deduplication processing unit 33a receives a plurality of vehicle information including the same vehicle ID. Since the processing is executed for one vehicle information and the other vehicle information is discarded, it is easier to eliminate the duplication of communication data than to eliminate the duplication of communication data for each uplink frame UL2. it can.

  Moreover, in this embodiment, the duplication exclusion process part 33a processes the one vehicle information which the central apparatus 3 acquired first among the several vehicle information containing the same vehicle ID, and discards other vehicle information. Since it comprised in this way, all the information acquired later among the several vehicle information containing the same vehicle ID can be discarded. As a result, it is possible to reduce the processing load related to communication data de-duplication and to facilitate the processing.

  In this embodiment, discarding information includes not only deleting the information but also not giving the information to an apparatus or the like that performs the next stage of processing.

FIG. 8 is a block diagram illustrating a configuration of the beacon controller 7 of the optical beacon 4 according to the modification of the first embodiment.
This modification is different from the first embodiment in that the processing device 31 of the beacon controller 7 includes a deduplication processing unit 31a.
The de-duplication processing unit 31a of the beacon controller 7 of the present modification, when acquiring a plurality of uplink frames including the same vehicle ID within a predetermined period, of the plurality of uplink frames including the same vehicle ID. It has a function of processing the previously acquired uplink frame and discarding other uplink frames.

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

  Also in this modified example, as in the first embodiment, each of the first beacon head 81 and the second beacon head 82 receives an uplink frame including the same vehicle ID, and thereby 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 uses the one uplink frame as the vehicle information in the center 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 processing the same communication data from the single in-vehicle device 2 in duplicate, and the vehicle information (uplink frame) can be appropriately processed.

[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 the configuration of the first embodiment, and the contents of the processing performed by the deduplication processing unit 33a are different.

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

  FIG. 9 shows the 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 in-vehicle device 2 in FIG. The mode at the time of 33a processing is shown.

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 generates the first beacon based on these. The vehicle information of the head 81 and the vehicle information of the second beacon head 82 are given to the central device 3.
Thereby, the de-duplication processing unit 33a of the present 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 frame numbers 2, 4, and 5. The transmitted communication data is lost, and the communication data stored in another frame number is normally received.
The vehicle information of the second beacon head 82 is the same as the uplink frame received by the second beacon head 82 shown in FIG. 7, and the frame numbers 2, 5, 6, 12, 14, 15, 16 Only the stored communication data has been successfully 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. As described in the first embodiment, the central device 3 includes the vehicle information of the first beacon head 81 and Vehicle information of the second beacon head 82 is acquired within the predetermined period.
Therefore, when the deduplication processing unit 33a of the present 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 are obtained. Are compared with each other.

The de-duplication processing unit 33a compares the presence / absence and contents of 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 if the same communication data is included in both the uplink frames UL2, the central device 3 leaves one previously acquired. Process and discard the other.
The deduplication processing unit 33a also stores communication data only in one vehicle information of both uplink frames UL2, and if the communication data is missing in the other uplink frame UL2, 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 , D ₁ are stored in both vehicle information at frame numbers 6, 12, 14, 15, 16 respectively. Here, assuming that the vehicle information of the first beacon head 81 is acquired first, the deduplication processing unit 33a is an uplink corresponding to the frame numbers 6, 12, 14, 15, 16 in the vehicle information of the first beacon head 81. The frame UL2 (communication data stored in) is processed, and the upstream frame UL2 corresponding to the frame numbers 6, 12, 14, 15, 16 in the vehicle information of the second beacon head 82 is discarded.

In FIG. 9, in frame numbers 3, 7, ₈ , ₉ , ₁₀ , ₁₁ , and ₁₃ , communication data D ₁₄ , D ₁₀ , D ₉ , D ₈ , and D ₇ are included only in the vehicle information of the first beacon head 81. , D ₆ , D ₄ are stored.
In frame numbers 2 and 5, communication data D ₁₅ and D ₁₂ are stored only in the vehicle information of the second beacon head 82.
If this the, deduplication processing unit 33a processes the vehicle information communication only it is stored in the data _{D 14, D 10, D 9} , D 8, D 7, D 6, D 4 of the first beacon head 81 At the same time, 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, the vehicle information after merging is such that only frame number 4 is missing, and communication data is 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 upstream frames UL2 including the same vehicle ID.

As described above, when a plurality of pieces of vehicle information (uplink frame UL2) including the same vehicle ID are acquired within a predetermined period, the deduplication processing unit 33a includes a plurality of pieces of vehicle information including the same vehicle ID. The communication data is compared with each other, and a plurality of pieces of vehicle information are merged while determining whether or not to discard the uplink frame in units of the uplink frame UL2 based on the comparison result.
In this modified example, since it is determined whether or not to discard each uplink frame UL2, it is possible to reduce communication data that is discarded wastefully.

  In the present embodiment, the case where the deduplication processing unit 33a of the central device 3 executes the above process is exemplified. However, as shown in the modification of the first embodiment, the beacon controller 7 performs the deduplication process. When the unit 31a is included, the de-duplication processing unit 31a of the beacon controller 7 can execute the above-described processing.

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

In FIG. 10, an optical beacon 4 </ b> A and an optical beacon 4 </ b> B 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. For example, the beacon head 8B is installed on the downstream side of the same road where the beacon head 8A is installed.
Therefore, the one vehicle-mounted device 2 normally communicates with the beacon head 8B after communicating with the beacon head 8A.

  FIG. 11 is a diagram illustrating an example of the content of the uplink frame transmitted by the in-vehicle device 2 and the content 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, after one in-vehicle device 2 transmits an uplink frame to the beacon head 8A of the optical beacon 4A installed on the road R, the beacon of the optical beacon 4B installed downstream of the beacon head 8A. An example of the content of the uplink frame and the content of the vehicle information when proceeding to the head 8B and transmitting the uplink frame toward the beacon head 8B is shown.

The uplink frame transmitted from the in-vehicle device 2 to the beacon head 8A has communication data D _{1 to} D ₁₆ stored in ₁₆ uplink frames UL2.
Further, the uplink frame with the same vehicle-mounted device 2 transmits toward the beacon head 8B is a 16 upstream frame UL2, communication data _D 11 _{to D 26} are stored.
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 vehicle-mounted device 2 to the uplink frame transmitted toward the beacon head 8B, contains communication data D ₁₁ to D ₁₆ that has sent toward the earlier beacon head 8A. That is, the vehicle-mounted device 2 is transmitting duplicate communication data _D 11 _{to D 16.}
This is due to the processing when the in-vehicle device 2 stores each communication data in the upstream frame UL2.

12 (a) is a diagram for explaining an example of processing when a vehicle-mounted device 2 stores the communication data in the upstream frame UL2, the vehicle-mounted device 2 is in transmitting communication data D ₁ to D ₁₆ An example is shown.
As shown in FIG. 12A, the in-vehicle device 2 has a storage area for storing communication data to be stored in the uplink frame UL <b> 2 in the storage device of the own device 2.
This storage area includes areas 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 Then, the latest communication data D ₁₆ among the communication data D _{1 to} D ₁₆ is sequentially stored so as to be stored in the area corresponding to the frame number 1.
When the in-vehicle device 2 stores the communication data in each of the regions corresponding to the frame numbers 1 to 16, the in-vehicle device 2 stores the communication data stored in the regions corresponding to the frame numbers 1 to 16 in the uplink frame UL2, and as an uplink frame Send.

The in-vehicle device 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 by a first-in first-out method when new communication data is generated. ing.

Therefore, for example, when communication data D _{17 to} D ₂₆ are newly generated after transmission of communication data D _{1 to} D ₁₆ as an uplink frame, the in-vehicle device 2 stores a storage area as shown in FIG. Among the communication data D _{1 to} D ₁₆ stored in the memory, the old communication data D _{1 to} D ₁₀ are discarded, and the communication data D _{11 to} D ₁₆ are moved to an area corresponding to the frame numbers 11 to ₁₆ . Furthermore, the in-vehicle device 2 stores new communication data D _{17 to} D ₂₆ in an area corresponding to the frame numbers 1 to 10.

The in-vehicle device 2 stores these communication data in the uplink frame UL2 and transmits it as an uplink frame.
Then, the communication data D _{11 to} D ₁₆ are transmitted redundantly.
As described above, the in-vehicle device 2 may transmit the communication data redundantly due to the processing when storing the communication data in the uplink frame UL2.

If vehicle device 2 has transmitted redundantly communication data _D 11 _{to D 16,} the communication data _D 11 _{to D 16,} it is received by both the beacon head 8B beacon heads 8A and optical beacon 4B of the optical beacon 4A become.

  In this case, the central apparatus 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 an uplink frame UL2 included in each of the plurality of vehicle information including the same vehicle ID, When a plurality of uplink frames UL2 including the same communication data are included, among the plurality of uplink frames UL2 including the same communication data, one uplink frame UL2 acquired first is processed, and another uplink frame UL2 is processed. Has the function of discarding.

  Note that the predetermined period in the present embodiment is set to, for example, a period of several hours to several days because the route from when the in-vehicle device 2 passes the beacon head 8A to when it passes the beacon head 8B cannot be specified. The

As described above, since the beacon heads 8A and 8B receive the uplink frame transmitted from the one vehicle-mounted device 2, the uplink frame (upstream frame) of the beacon head 8A and the uplink of the beacon head 8B. The same vehicle ID is stored in the frame (the upstream frame).
Therefore, the same vehicle ID is also 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 performs 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. When a plurality of the same communication data is included as a result of the comparison, the deduplication processing unit 33a processes the upstream frame UL2 (communication data) included in the vehicle information of the optical beacon 4A acquired earlier, and performs the optical beacon 4B. The upstream frame UL2 (communication data) included in the vehicle information is discarded.

Therefore, deduplication processing unit 33a discards the communication data _D 11 _{to D 16} that processes the communication data _D 11 _{to D 16} included in the vehicle information of the light beacon 4A previously acquired included in the vehicle information of the light beacon 4B To do.
Thereby, also in this embodiment, duplication of the communication data contained in each of the plurality of upstream frames UL2 including the same vehicle ID can be eliminated. As a result, it is possible to prevent the same communication data from one in-vehicle device 2 from being processed in duplicate, and the vehicle information (uplink frame) can be appropriately processed.

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

[Others]
The embodiment disclosed this time should be considered as illustrative in all points and not restrictive.
For example, in the first embodiment, when the deduplication processing unit 33a of the central device 3 acquires a plurality of pieces of vehicle information including the same vehicle ID within a predetermined period, the plurality of pieces of vehicle information including the same vehicle ID are included. An example of processing the vehicle information acquired earliest in the central device 3 and discarding other vehicle information, but processing the vehicle information acquired latest during a predetermined period in the central device 3, Other vehicle information may be discarded.

  Moreover, in the said 3rd Embodiment, when the vehicle information containing the same vehicle ID is given in multiple numbers within the predetermined period, the deduplication process part 33a is included in each of the some vehicle information containing the same vehicle ID. When the communication data of the frame UL2 is compared, and a plurality of uplink frames UL2 including the same communication data are included, one uplink frame UL2 acquired first among the plurality of uplink frames UL2 including the same communication data However, the configuration is such that the upstream frame UL2 acquired latest during a predetermined period is processed in the central device 3 and the other upstream frame UL2 is discarded. May be.

  The scope of the present invention is defined by the terms of the claims, rather than the meanings described above, and is intended to include any modifications within the scope and meaning equivalent to the terms of the claims.

DESCRIPTION OF SYMBOLS 1 Traffic control system 2 In-vehicle apparatus 3 Central apparatus 4, 4A, 4B Optical beacon 5 Communication line 7, 7A, 7B Beacon controller 8, 8A, 8B Beacon head 10 Optical transmission part 11 Optical reception part 13 Strut 14 Construction bar 20 Vehicle DESCRIPTION OF SYMBOLS 21 Car-mounted controller 22 Car-mounted head 23 Optical transmission part 24 Optical receiving part 30 Communication apparatus 31 Processing apparatus 31a Deduplication processing part 32 Communication apparatus 33 Processing apparatus 33a Deduplication processing part 81 1st beacon head 82 2nd beacon head

Claims (8)

A plurality of light emitters / receivers that set different communication areas on the road;
A communication frame from an in-vehicle device received by the plurality of light emitters / receivers is provided, and a processing device that performs a predetermined process on the communication frame, and
The processor is
Communication provided with a deduplication unit that eliminates duplication of communication data included in each of the plurality of communication frames including the same vehicle ID when a plurality of the communication frames including the same vehicle ID are acquired within a predetermined period. Data processing system. The communication frame is given to the processing device as a communication frame group including a plurality of the communication frames,
The deduplication unit includes:
The plurality of 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. 3. The deduplication unit according to claim 2, wherein the predetermined processing is executed by using the communication frame group acquired first among the plurality of communication frame groups including the same vehicle ID as the one communication frame group. Communication data processing system. The deduplication unit compares 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 a comparison result. The communication data processing system according to claim 1 which determines whether or not. The predetermined period is based on a difference in acquisition timing when the processing device acquires a plurality of communication frames including the same vehicle ID when each of the plurality of projectors / receivers receives the same communication frame. The communication data processing system according to any one of claims 1 to 4, wherein the communication data processing system is set. The processing device is a central control device to which the communication frame is given from a projector / receiver control device that controls the plurality of projectors / receivers.
The communication data processing system according to any one of claims 1 to 5, wherein the predetermined process is generation of a traffic index using vehicle information included in the communication frame. The processing device is a projector / receiver control device that controls the plurality of projectors / receivers,
The communication data processing system according to any one of claims 1 to 5, wherein the predetermined processing is transfer of the communication frame to a central control device connected to the projector / receiver control device. A plurality of optical beacons that perform wireless communication with an in-vehicle device of a traveling vehicle by an optical signal;
A central control device that is given a communication frame from the in-vehicle device received by the plurality of optical beacons and performs a predetermined process on the communication frame information,
The central controller is
Communication provided with a deduplication unit that eliminates duplication of communication data included in each of the plurality of communication frames including the same vehicle ID when a plurality of the communication frames including the same vehicle ID are acquired within a predetermined period. Data processing system.

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