JP6906575B2 - Roadside wireless communication equipment and control system - Google Patents

Description

The invention roadside communication equipment, relates及beauty control system.

Patent Document 1 discloses a traffic control system in which a traffic terminal such as a traffic signal controller, an optical beacon, and a traffic information board is controlled by a central device of a traffic control center. Optical beacons are installed in each direction of the vehicle (roads extending in a predetermined direction starting from the intersection), and the optical beacons are mobile communication devices (vehicle-mounted communication devices) by optical communication using near infrared rays. ) Is aggregated in the central device, and in this central device, for example, signal control of a traffic signal, traffic control for controlling a traffic flow, and the like are executed.

Japanese Unexamined Patent Publication No. 2005-268925

However, the transmission processing load of the roadside wireless communication device and other devices cannot be reduced.

The present invention has been made in view of such problems, and makes it possible to reduce the processing load of the roadside wireless communication device and other devices.

The present invention includes a receiving unit that wirelessly receives information data transmitted from the mobile communication device and including information that can identify the position of the mobile communication device, and the information data wirelessly received by the receiving unit. A roadside wireless communication device including a transmission unit that transmits mobile information to another device, based on the position of the mobile communication device identified from the information data wirelessly received by the reception unit. The transmission unit includes a transmission determination unit that determines whether or not the transmission unit corresponds to the transmission timing of transmission to the other device, and the transmission unit performs the above-mentioned other when the determination result of the transmission determination unit is positive. It is a roadside wireless communication device configured to transmit the mobile body information to the device of the above.

From another point of view, the present invention obtains mobile information included in the information data from a roadside wireless communication device that wirelessly receives information data including information that can identify the position of the mobile communication device from the mobile communication device. A control device including a receiving communication unit and a control unit that outputs a command to end a specific control based on the mobile body information received by the communication unit. The control unit is the mobile body. The control device is configured to output a command to end the specific control when the communication unit receives the mobile information when the communication device flows into a predetermined area.

From another point of view, the present invention is a receiving unit that wirelessly receives information data transmitted from the mobile communication device and including information that can identify the position of the mobile communication device, and the receiving unit wirelessly receiving the information data. It is identified from a roadside wireless communication device having a transmission unit that transmits information data to the outside, a communication unit that receives the information data transmitted by the transmission unit of the roadside wireless communication device, and the information data received by the communication unit. A control determination unit that determines whether or not it is time to output a command related to a specific control based on the position of the mobile communication device, and an output of the command when the determination result of the control determination unit is positive. It is a control system including a control device having a control unit for the operation.

According to the present invention, the processing load of the roadside wireless communication device and other devices can be reduced.

It is a top view of the road to which the traffic control system including the roadside radio communication device and the central device which concerns on 1st reference example is applied. It is a functional block diagram which shows the internal structure of the roadside wireless communication device. It is explanatory drawing which shows the communication session established between the roadside radio communication device and a central device. It is a data structure diagram of a packet. It is a functional block diagram which shows the internal structure of a central device. It is a judgment table showing the route corresponding to the destination port number. It is a flowchart which shows the process executed by the roadside wireless communication device. It is a flowchart which shows the process executed by a central device. It is explanatory drawing which shows the modification example of the communication session established between the roadside radio communication device and a central apparatus, and the data structure of the packet transmitted using the communication session. It is a judgment table used in the modification of FIG. It is a top view of the road to which the traffic control system including the roadside radio communication device and the central device which concerns on 2nd reference example is applied. It is a functional block diagram which shows the internal structure of the optical beacon of the 2nd reference example. It is explanatory drawing which shows the communication session established between the optical beacon controller of the 2nd reference example and a central apparatus, and the data structure of the packet transmitted using the communication session. This is a determination table used in the second reference example. FIG. 5 is a plan view of a road to which a traffic control system including a roadside radio communication device and a central device according to an embodiment of the present invention is applied. It is a functional block diagram which shows the internal structure of the roadside wireless communication apparatus of the said embodiment. It is a transmission determination table used in the said embodiment. It is a functional block diagram which shows the internal structure of the central device of the said embodiment. It is a control determination table used in the said embodiment. It is a flowchart which shows the determination process of the transmission timing executed by the roadside wireless communication apparatus of the said embodiment. It is a flowchart which shows the determination process when the transmission form is a set transmission in the said embodiment. It is a flowchart which shows the determination process when the transmission form is a reset transmission in the said embodiment. It is a flowchart which shows the determination process when the transmission form is a shared transmission in the said embodiment. It is a flowchart which shows the determination process when the transmission form is combined transmission in the said embodiment. It is a flowchart which shows the command processing of FAST executed by the central apparatus of the said embodiment. It is a functional block diagram which shows the modification of the control device of the said embodiment, and shows the internal structure of the control device. Other modifications of the roadside wireless communication device and the central device of the above embodiment are shown, (a) is a functional block diagram showing an internal configuration of the roadside wireless communication device, and (b) is an internal configuration of the central device. It is a functional block diagram which shows.

[Explanation of Embodiments of the Present Invention]
First, the contents of the embodiments of the present invention will be listed and described.
(1) The roadside wireless communication device according to the embodiment of the present invention includes a receiving unit that wirelessly receives information data transmitted from the mobile communication device and including information that can identify the position of the mobile communication device, and the above. A roadside wireless communication device including a transmission unit that transmits mobile information included in the information data wirelessly received by the reception unit to another device, and is identified from the information data wirelessly received by the reception unit. A transmission determination unit for determining whether or not the transmission unit corresponds to a transmission timing for transmission to the other device based on the position of the mobile communication device is provided, and the transmission unit is a transmission determination unit of the transmission determination unit. When the determination result is positive, the moving body information is transmitted to the other device.
Here, the "mobile information" is information included in the information data transmitted by the mobile communication device and excluding information capable of identifying the position of the mobile communication device.

According to the roadside wireless communication device, it is determined whether or not the transmission unit corresponds to the transmission timing of transmission to another device based on the position of the mobile communication device, and if the determination result is affirmative. Since the mobile information is transmitted to this device, the amount of data transmitted to other devices can be reduced (thinned out). As a result, the transmission processing load of the roadside wireless communication device can be reduced, and the processing load of other devices can be reduced.

(2) In the roadside wireless communication device of (1), it is preferable that the number of transmissions from the transmission unit to the other device is set to one. In this case, the amount of data transmitted to other devices can be further reduced.

(3) The mobile communication device according to (1) or (2) is an in-vehicle communication device mounted on a vehicle, and the information data includes information that can identify that the vehicle is a specific vehicle. The transmission determination unit is configured to determine whether or not the transmission timing is applicable when the vehicle is the specific vehicle based on the information data wirelessly received by the reception unit. Is preferable.
Here, the "specific vehicle" means an emergency vehicle such as a police car or an ambulance, and a public vehicle such as a bus.
In this case, the amount of data for transmitting the moving body information of the specific vehicle can be reduced.

(4) The transmission unit according to any one of (1) to (3) transmits the mobile information in order to start a specific control, and the transmission determination unit is the mobile communication device. Is preferably configured to be determined to correspond to the transmission timing when is present in a range near a predetermined position in a predetermined area.
Here, the "neighborhood range of a predetermined position" means a predetermined position and a range in the vicinity thereof.
In this case, when the mobile communication device exists in the vicinity range of the predetermined position in the predetermined area, the mobile body information for starting the specific control is transmitted, so that the mobile communication device is in the predetermined area. Certain controls can be reliably initiated when present within.

(5) It is preferable that the installation position of the optical beacon is set in advance in the predetermined area of the above (4), and the predetermined position is the installation position of the optical beacon.
In this case, since the preset installation position of the optical beacon in the predetermined area can be diverted as the predetermined position for determining the existence of the mobile communication device, the roadside wireless communication device performs specific control. The amount of repairs for this can be reduced.

(6) The range near the predetermined position in (4) or (5) is the range from the first distance to the second distance with respect to the predetermined point (however, the second distance> the first distance, and the first distance. (Including the case where 1 distance = 0), the transmission determination unit determines the transmission timing when the mobile communication device exists within the range from the first distance to the second distance. It is preferable that the configuration is such that it corresponds to.
In this case, the transmission determination unit determines whether or not the mobile communication device exists within the range from the first distance to the second distance, and thus determines whether the mobile communication device exists within the predetermined area. Whether or not it can be easily determined.

(7) The neighborhood range of the predetermined position in (4) or (5) is a predetermined coordinate range, and the transmission determination unit has the mobile communication device within the coordinate range. Occasionally, it may be configured to determine that the transmission timing is met.
In this case, the transmission determination unit easily determines whether or not the mobile communication device exists in the predetermined area by determining whether or not the mobile communication device exists within the predetermined coordinate range. can do.

(8) The transmission unit according to any one of (1) to (7) transmits the mobile information in order to terminate a specific control, and the transmission determination unit is the mobile communication device. It is preferable that the transmission timing is determined to correspond to the transmission timing when the is flowing into the predetermined area.
In this case, since the mobile information for terminating the specific control is transmitted when the mobile communication device flows into the predetermined area, the specific control is performed when the mobile communication device flows into the predetermined area. It can be terminated quickly.

(9) It is preferable that a plurality of the transmission timings are set in the predetermined area according to any one of (4) to (8).
In this case, the installation cost can be suppressed as compared with the case where a plurality of optical beacons are installed in a predetermined area and the transmission timing is set.

(10) The control device according to the embodiment of the present invention from another viewpoint is a roadside wireless communication device that wirelessly receives information data including information that can identify the position of the mobile communication device from the mobile communication device. A control device including a communication unit that receives mobile information included in the information data, and a control unit that outputs a command to end a specific control based on the mobile information received by the communication unit. The control unit is configured to output a command to end the specific control when the communication unit receives the mobile information when the mobile communication device flows into a predetermined area.

According to the control device, when the mobile communication device receives the mobile information from the roadside wireless communication device when the mobile communication device flows into the predetermined area, a command to end the specific control is output, so that the specific control can be quickly performed. Can be terminated.

(11) The control system according to the embodiment of the present invention from another viewpoint is a receiving unit that wirelessly receives information data including information that is transmitted from the mobile communication device and can identify the position of the mobile communication device. A roadside wireless communication device having a transmission unit that transmits the information data wirelessly received by the reception unit to the outside, a communication unit that receives the information data transmitted by the transmission unit of the roadside wireless communication device, and the communication unit. The control determination unit that determines whether or not it is the timing to output a command related to a specific control based on the position of the mobile communication device identified from the information data received by the control determination unit, and the determination result of the control determination unit. It includes a control device having a control unit that outputs the command when the result is positive.

According to the above control system, the roadside wireless communication device transmits the information data acquired from the mobile communication device to the control device, and the control device side is based on the position of the mobile communication device identified from the information data. Therefore, the timing of outputting a command related to a specific control can be easily determined.

[Details of Embodiments of the present invention]
Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings.
[First reference example]
[Overall system configuration]
FIG. 1 is a plan view of a road to which a traffic control system including a roadside radio communication device and a central device according to the first reference example is applied. This traffic control system includes an in-vehicle communication device (mobile communication device) 7 mounted on a central device 3, a roadside wireless communication device 4, a traffic signal 5, and a vehicle 6 traveling on a road R provided in a traffic control room or the like. Etc. are included. The mobile communication device is not limited to the in-vehicle communication device 7, and may be, for example, a pedestrian communication device owned by a pedestrian.

The inflow roads (directions) L1 to L4 and the outflow roads (directions) L5 to L8 at the intersection C shown in FIG. 1 are all one lane. The number of lanes and the like are examples, and the structure of the intersection C is not limited to that shown in FIG.
The traffic signal 5 includes a traffic signal 5a that emits red, blue, and yellow lights, and a traffic signal controller 5b for controlling the light color of the traffic signal 5a. The traffic signal controller 5b is connected to the roadside router 9 by a communication line 8a. The roadside router 9 is connected to the router 11 on the central device 3 side via the network network 10.

The signal control information i1 generated by the central device 3 that collects traffic information, manages traffic, and controls traffic is transmitted to the traffic signal controller 5b of each traffic signal 5 through the network network 10 and the communication line 8a. On the other hand, the traffic signal controller 5b transmits the execution information i2 indicating the actual result of the signal control actually performed to the central device 3. The central device 3 collects traffic information, manages traffic, and controls traffic, but at least one of these may be performed.

One roadside wireless communication device 4 is installed at each intersection, and the information i3 to be transmitted to the vehicle-mounted communication device 7 of the moving vehicle 6 is wirelessly transmitted, and the information transmitted by the vehicle-mounted communication device 7 is wirelessly transmitted. Receive. The roadside wireless communication device 4 of this reference example is a medium / wide area wireless communication device (including 700MHz band wireless communication) compliant with wireless LAN, WiMAX (Worldwide Interoperability for Microwave Access), etc., assuming an ITS wireless system. be.

The information i3 transmitted by the roadside wireless communication device 4 includes traffic information (traffic jam information, traffic regulation information, etc.) distributed by the central device 3. Further, the information transmitted by the in-vehicle communication device 7 includes information data such as a vehicle ID of the vehicle 6, vehicle type information, and position information. The roadside wireless communication device 4 is connected to the roadside router 9 by a communication line 8b. The vehicle information (mobile information) i4 included in the information data transmitted by the in-vehicle communication device 7 is transmitted from the roadside wireless communication device 4 to the central device 3 through the communication line 8b and the network network 10. Here, the "vehicle information" is information (vehicle ID, vehicle type information, etc.) about the vehicle 6 included in the information data transmitted by the in-vehicle communication device 7, and is position information capable of identifying the position of the vehicle 6. Information to be excluded.

The in-vehicle communication device 7 has a communication function for wirelessly transmitting and receiving information to and from the roadside wireless communication device 4. When the vehicle 6 enters the communication area of the roadside wireless communication device 4 while the vehicle 6 is traveling toward the intersection C, the vehicle-mounted communication device 7 wirelessly receives information i3 from the roadside wireless communication device 4 and also includes information including the information data. Is wirelessly transmitted to the roadside wireless communication device 4 at a predetermined transmission cycle (for example, 100 msec).

In the traffic control system in this reference example, the vehicle 6 is a specific vehicle including an emergency vehicle such as a police car or an ambulance or a public vehicle such as a bus, and the roadside radio communication device 4 installed at the intersection through which this specific vehicle passes is specified. The inter-vehicle communication information received from the vehicle is transmitted to the central device 3, and the central device 3 controls the traffic signal lamp 5a so that the specific vehicle can preferentially pass through the intersection to which the specific vehicle is going, or the specific vehicle approaches. It is used when sending information to notify other vehicles that it is going on. The traffic control system may be applied to a general vehicle other than the specific vehicle as the vehicle 6.

[Roadside wireless communication device]
FIG. 2 is a functional block diagram showing an internal configuration of the roadside wireless communication device 4.
The roadside wireless communication device 4 includes a reception unit 401, a determination unit 402, a transmission unit 404, and a storage unit 405 inside. The receiving unit 401 includes a communication interface that performs UD type transmission, and wirelessly receives the information data including the position information that can identify the position of the vehicle-mounted communication device 7 from the vehicle-mounted communication device 7. The receiving unit 401 may be a communication interface that performs U-shaped transmission. In the case of this U-shaped transmission, a communication session established based on the address corresponding to the IP address or port number is used instead of the IP address or port number.
The determination unit 402 determines the route in the area (wide area) in which the vehicle-mounted communication device 7 that is the transmission source exists, based on the information data wirelessly received by the reception unit 401. Here, the "direction" means an inflow road or an outflow road in which the vehicle 6 equipped with the in-vehicle communication device 7 is in progress. The specific determination method of the determination unit 402 will be described later. The area determined by the determination unit 402 may be an area classified by lane or an area classified by any other area, in addition to the area classified by the road.

A communication session is established in advance between the roadside wireless communication device 4 and the central device 3.
FIG. 3 is an explanatory diagram showing a communication session established between the roadside radio communication device 4 and the central device 3. The roadside wireless communication device 4 has a plurality of ports Pa1 to Pa16 (16 in the illustrated example). Of these ports Pa1 to Pa16, ports Pa1 to Pa8 are used as transmission ports, and the remaining ports Pa9 to Pa16 are used as reception ports.
Ports Pb1 to Pb16 are set with different port numbers (“8001” to “8016” in the illustrated example). In this reference example, the port numbers of ports Pa1 to Pa8 are used as source port numbers (“8001” to “8008” in the figure), and the remaining port numbers of ports Pa9 to Pa16 are destination port numbers (FIG. In the example, it is used as "8009" to "8016").

On the other hand, the central device 3 has a plurality of ports Pb1 to Pb16 (16 in the illustrated example). Of these ports Pb1 to Pb16, ports Pb1 to Pb8 are used as receiving ports, and the remaining ports Pb9 to Pb16 are used as transmitting ports.
Ports Pb1 to Pb16 are set with different port numbers (“8001” to “8016” in the illustrated example). In this reference example, the port numbers of ports Pb1 to Pb8 are used as destination port numbers (“8001” to “8008” in the figure), and the remaining port numbers of ports Pb9 to Pb16 are source port numbers (FIG. In the example, it is used as "8009" to "8016").

In FIG. 2, the transmission unit 404 comprises a communication interface that performs UD type transmission, and packet-transmits the vehicle information i4 included in the information data wirelessly received by the reception unit 401 to the central device 3 using the communication session. .. When the determination unit 402 determines that the route is the inflow path L1, the transmission unit 404 of this reference example has a port Pa1 which is a transmission port of the roadside radio communication device 4 and a port Pb1 which is a reception port of the central device 3. Use the communication session established between. Similarly, when it is determined that the direction is one of the inflow path (outflow path) L2 to L8, the transmission unit 404 has the ports Pa2 to Pa8 which are the transmission ports of the roadside wireless communication device 4 and the central device 3. Different communication sessions established as shown in the figure are used between ports Pb2 to Pb8, which are receiving ports. In this way, the transmission unit 404 transmits using different ports between the roadside radio communication device 4 and the central device 3 according to the roads L1 to L8.

FIG. 4 is a data structure diagram of a packet transmitted from the transmission unit 404 to the central device 3. The packet in this reference example has an IP header, a UDP header, and data areas from the beginning. The IP header contains a destination IP address and a source IP address. In the figure example, only the destination IP address is shown. The UDP header contains a destination port number and a source port number. In the figure example, only the destination port number is shown. The data area includes vehicle information i4 acquired from the information data wirelessly received by the receiving unit 401.

Therefore, when using the communication session established between the port Pa1 of the roadside radio communication device 4 and the port Pb1 of the central device 3, the transmission unit 404 includes the destination port number “8001” in the UDP header. Send a packet in the state. Similarly, when using the communication sessions established between the ports Pa2 to Pa8 of the roadside wireless communication device 4 and the ports Pb2 to Pb8 of the central device 3, the transmission unit 404 is added to the UDP header as shown in the figure. The packet is transmitted in a state including any one of "8002" to "8008" which is the destination port number of.

When the receiving unit 401 transmits a packet to the central device 3 for each information data wirelessly received from the in-vehicle communication device 7 one after another, the transmission unit 404 increases the transmission load of the roadside wireless communication device 4 and the traffic of the communication line, and also centrally. Since a large processing load is applied to the device 3, a process of reducing (thinning out) the amount of data transmitted to the central device 3 is performed. Specifically, the transmission unit 404 wirelessly receives information data including the same vehicle ID for each of the directions L1 to L8 a predetermined number of times during a predetermined time (predetermined period) by the receiving unit 401. Information data is transmitted to 3 once. Note that this thinning process is merely an example, and the amount of data may be reduced by other methods.
The storage unit 405 stores a computer program that executes the above-mentioned determination process by the determination unit 402 and the above-mentioned transmission process by the transmission unit 404.

[Centralized Traffic Control]
FIG. 5 is a functional block diagram showing the internal configuration of the central device 3. The central device 3 includes a communication unit 301, a processing unit 302, and a storage unit 303 inside. The communication unit 301 comprises a communication interface corresponding to both U-type transmission and UD-type transmission, and transmits signal control information i1 regarding the switching timing of the signal lamp color at predetermined time intervals to the traffic signal controller 5b.
Further, the communication unit 301 receives the vehicle information i4 including the vehicle ID of the vehicle 6 and the vehicle type information from the roadside wireless communication device 4. Specifically, the communication unit 301 is connected to the roadside wireless communication device 4 via one communication line 8b via the roadside router 9 (see FIG. 1), and is between the central device 3 and the roadside wireless communication device 4. The vehicle information i4 is received using the communication session established in.

The processing unit 302 has an in-vehicle communication device 7 that is a source of vehicle information i4 based on the communication session used by the communication unit 301 and the determination table (see FIG. 6) stored in the storage unit 303. Determine the direction you are in. The determination table is a list showing the directions L1 to L8 corresponding to the destination port numbers "8001" to "8008". The processing unit 302 determines the route corresponding to the destination port number included in the UDP header of the communication session used by the communication unit 301 with reference to the determination table.
The storage unit 303 stores a computer program that executes the above-mentioned determination process by the processing unit 302, and the determination table.

[Communication method]
FIG. 7 is a flowchart showing a process executed by the roadside wireless communication device 4. Further, FIG. 8 is a flowchart showing a process executed by the central device 3. Hereinafter, a communication method for transmitting vehicle information i4 from the roadside wireless communication device 4 to the central device 3 will be described with reference to FIGS. 7 and 8.
First, when the receiving unit 401 of the roadside wireless communication device 4 wirelessly receives the information data transmitted by the in-vehicle communication device 7 (step S1 in FIG. 7), the vehicle model and the vehicle ID are recognized from the information data (FIG. 7). Step S2). Next, the determination unit 402 of the roadside wireless communication device 4 determines the direction in which the in-vehicle communication device 7 that is the transmission source exists based on the position information included in the information data wirelessly received by the reception unit 401. (Judgment step, step S3 in FIG. 7). For example, as shown in FIG. 1, when the roadside wireless communication device 4 is installed at the intersection C, the determination unit 402 determines that the vehicle 6 equipped with the in-vehicle communication device 7 has an inflow path L1 to L4 and an outflow path L5. -Determine which of the roads L8 you are traveling on.

Specifically, the determination unit 402 first bases on the position data indicating the central position of the intersection C stored in the storage unit 405 and the position information indicating the latitude and longitude of the vehicle 6 included in the information data. , The inclination angle of the virtual straight line connecting these two points with respect to the true north direction is calculated, and the approximate direction in which the vehicle 6 exists is determined from the central position of the intersection C. For example, when the vehicle 6 is traveling in the position shown in FIG. 1, the determination unit 402 can determine that the vehicle 6 is located in the inflow path L1 or the outflow path L5.

Next, the determination unit 402 calculates the distance between the two points, and determines the direction depending on how this distance changes with the passage of time. That is, when the distance between the two points becomes shorter with the passage of time, it is determined that the vehicle 6 is traveling on the inflow path, and conversely, when the distance between the two points becomes longer with the passage of time. Determines that the vehicle 6 is traveling on the outflow route. For example, when the vehicle 6 is traveling at the position shown in FIG. 1, the distance between the two points becomes shorter with the passage of time, so the determination unit 402 determines that the vehicle 6 is traveling in the inflow path L1. do.
The determination unit 402 is not limited to the above-mentioned determination method. For example, the determination unit 402 performs map matching processing based on a plurality of position information of the vehicle 6 and the road map data stored in the storage unit 405, thereby performing the vehicle matching process. The direction in which 6 exists may be determined.

After the determination unit 402 determines the direction in step S3, the transmission unit 404 performs a thinning process of data to be transmitted to the central device 3. First, the transmitting unit 404 determines whether or not the receiving unit 401 has received the information i4 including the same vehicle ID one after another within a certain time in the past (step S4 in FIG. 7). When the receiving unit 401 has received the information i4 including the same vehicle ID one after another within a certain time in the past, the transmitting unit 404 then transmits the information i4 including the same vehicle ID received in the past. It is determined whether or not the original vehicle-mounted communication device 7 is in the same direction as the existing one (step S5 in FIG. 7). If the directions are the same, then the transmitting unit 404 determines whether or not the receiving unit 401 has received the information i4 including the same vehicle ID N times (N ≧ 2) (FIG. 7). Step S6). When the receiving unit 401 receives the information i4 including the same vehicle ID N times, the process proceeds to step S7 in FIG.
On the other hand, if the information i4 including the same vehicle ID is not received in step S4, the directions are not the same in step S5, or if the information i4 is not received N times in step S6, the process returns to step S1.

In step 7 of FIG. 7, the transmission unit 404 has a predetermined range of the distance from the central position of the intersection C to the vehicle 6 by the in-vehicle communication device 7 which is the transmission source of the information data one or more times out of N times. It is determined whether or not the data was received from within. Then, when the distance is received from within a predetermined range, the transmission unit 404 transmits the vehicle information i4 to the central device 3 once (transmission step, step S8 in FIG. 7).
At that time, the transmission unit 404 transmits using different communication sessions established between the roadside radio communication device 4 and the central device 3 according to the direction determined by the determination unit 402. For example, when the determination unit 402 determines the inflow path L1, the communication session established between the port Pa1 which is the transmission port of the roadside wireless communication device 4 and the port Pb1 which is the reception port of the central device 3 is used. (See Fig. 3).
On the other hand, in step 7, if the distance from the central position of the intersection C to the position where the vehicle 6 exists is within a predetermined range and no reception is performed, the process returns to step S1.

In step S8, the transmission unit 404 packet-transmits the vehicle information i4 to the central device 3 using the established communication session. At that time, the transmission unit 404 transmits the packet in a state where the vehicle information i4 is included in the data area of the packet and the destination port number of the communication session is included in the UDP header of the packet. For example, when a packet is transmitted using a communication session established between port Pa1 of the roadside wireless communication device 4 and port Pb1 of the central device 3, the transmission unit 404 is set to port Pb1 of the central device 3. The packet is transmitted with the destination port number "8001" included in the UDP header.

When the communication unit 301 receives the packet including the vehicle information i4 transmitted from the transmission unit 404 of the roadside wireless communication device 4 (step S11 in FIG. 8), the central device 3 communicates with the processing unit 302 of the central device 3. The destination port number included in the UDP header of the communication session used by the unit 301 is acquired, and the route corresponding to this destination port number is determined with reference to the determination table (see FIG. 6) (determination step, FIG. 8). Step S12).
For example, when the destination port number included in the UDP header of the communication session used by the communication unit 301 is "8001", the processing unit 302 refers to the determination table and finds the route corresponding to the destination port number "8001". It is determined that the inflow path L1.

As described above, according to the roadside wireless communication device 4 and the central device 3 of this reference example, based on the information data wirelessly received from the vehicle-mounted communication device 7, the route in which the vehicle-mounted communication device 7 that is the transmission source exists is determined. In order to transmit the vehicle information i4 included in the information data to the central device 3 by using different communication sessions established according to the determined direction, the central device 3 is connected to the roadside wireless communication device 4. Based on the communication session established between the two, the route in which the in-vehicle communication device 7 that is the source of the vehicle information i4 exists can be determined. As a result, it is not necessary to change the data format transmitted from the roadside wireless communication device 4 to the central device 3, so that the data format transmitted from the roadside wireless communication device 4 to the central device 3 is changed as compared with the case where the central device 3 is changed. While reducing the amount of repair, the central device 3 can determine the direction in which the in-vehicle communication device 7 exists.

Further, since a communication session established between the roadside wireless communication device 4 and the central device 3 based on a different port for each of the plurality of directions L1 to L8 is used, transmission from the roadside wireless communication device 4 to the central device 3 is performed. Compared to the case where the area information in which the in-vehicle communication device 7 exists is included in the data to be performed, the in-vehicle communication device 7 in the central device 3 can be used without repairing the central device 3 or by making minor repairs to the central device 3. Can determine the direction in which.
Further, when the transmitting unit 404 of the roadside wireless communication device 4 wirelessly receives the information data including the same vehicle ID for each route a predetermined number of times during a predetermined period, the transmitting unit 404 wirelessly receives the vehicle information to the central device 3. Since the i4 is transmitted once, the amount of data transmitted to the central device 3 can be reduced (thinned). As a result, the transmission processing load of the roadside wireless communication device 4 can be reduced, and the processing load of the central device 3 can be reduced.
Further, since the transmission unit 404 of the roadside wireless communication device 4 transmits to the central device 3 when the distance from the intersection C to the vehicle 6 is within a predetermined distance, the central device 3 is the roadside wireless communication device 4. Even when the vehicle information i4 is received from, the timing at which the vehicle 6 passes through the intersection C can be determined by using the distance from the intersection C to the vehicle 6.

[Modified example of communication session]
FIG. 9 is an explanatory diagram showing a modified example of the communication session established between the roadside wireless communication device 4 and the central device 3 of this reference example, and the data structure of the packet transmitted using the communication session. Further, FIG. 10 shows a determination table used by the central device 3 in the modified example of FIG. In this modification, the roadside wireless communication device 4 has a plurality of (8 in this case) different IP addresses (for example, "10.1.1.1" to "10.1.1.1.8"). ..

The transmission unit 404 of the roadside wireless communication device 4 in this modification transmits using a communication session established based on a different source IP address for each of the plurality of directions L1 to L8. For example, as shown in FIG. 9, when the determination unit 402 determines that the route is the inflow route L1, the transmission unit 404 uses the communication session established by the source IP address "10.1.1.1". And send. Similarly, when the determination unit 402 determines that the route is one of the inflow route L2 and the outflow route L8, the transmission unit 404 uses the destination IP addresses "10.1.1.2" to "10" of the central device 3. From "1.1.1.8", transmission is performed using a communication session established by a different source IP address as shown in the figure.
At that time, as shown in FIG. 9, the transmission unit 404 transmits the packet in a state where the vehicle information i4 is included in the data area of the packet and the source IP address of the communication session is included in the IP header of the packet.

After the central device 3 receives the packet including the vehicle information i4 transmitted from the transmission unit 404 of the roadside wireless communication device 4 in the communication unit 301, the processing unit 302 sets the IP header of the communication session used by the communication unit 301. The included source IP address is acquired, and the route corresponding to this source IP address is determined by referring to the determination table (see FIG. 10). This determination table is a list showing the routes L1 to L8 corresponding to the respective source IP addresses "10.1.1.1" to "10.1.1.1.8". For example, when the source IP address included in the IP header of the communication session used by the communication unit 301 is "10.1.1.1", the processing unit 302 refers to the determination table and determines the source IP address. It is determined that the route corresponding to "10.1.1.1" is the inflow route L1.

As described above, according to the roadside wireless communication device 4 and the central device 3 of this modification, the roadside wireless communication device 4 and the central device 3 are established by using different IP addresses for each of the plurality of directions L1 to L8. Since the communication session is used, the central device 3 has already been introduced because the communication session is the same as when the communication session established with the optical beacon 20 described later is used (see FIGS. 13 and 14). By utilizing the conventional central device, it is possible to determine the direction in which the in-vehicle communication device 7 exists in the central device 3.

[Second reference example]
FIG. 11 is a plan view of a road to which a traffic control system including a roadside radio communication device 4 and a central device 3 according to a second reference example is applied. The traffic control system of this reference example differs from the first reference example in that road-to-vehicle communication with the in-vehicle communication device 7 is performed not only by the roadside wireless communication device 4 but also by the optical beacon 20. The optical beacon 20 performs wireless communication by an optical signal, that is, optical communication using near infrared rays as a communication medium, and also functions as an optical vehicle detector with the in-vehicle communication device 7 of the moving vehicle 6. A total of eight optical beacons 20 in this reference example are provided on the upstream side of the inflow path (direction) L1'to L4' at the intersection C'and on the outflow path (direction) L5'to L8'.

Each optical beacon 20 includes an optical beacon controller 21 and an optical beacon head (light emitting / receiving device) 22 connected to the optical beacon controller 21. The optical beacon heads 22 of each optical beacon 20 are installed directly above the upstream side of the inflow path L1'to L4'and directly above the upstream side of the outflow path L5'to L8', respectively. The optical beacon controller 21 is connected to the roadside router 12 by the communication line 8c. The roadside router 12 is connected to the router 11 on the central device 3 side via the network network 10. The optical beacon 20 receives uplink data including information data such as the vehicle ID and vehicle type information of the vehicle 6 from the vehicle-mounted communication device 7 of the vehicle 6 traveling in the vicinity of the installation position. Then, the vehicle information i4 included in the uplink data acquired by the optical beacon controller 21 is transmitted to the central device 3 through the communication line 8c and the network network 10. Further, information including traffic information is transmitted from the central device 3 to each optical beacon 20 through the communication line 8c.

FIG. 12 is a functional block diagram showing an internal configuration of the optical beacon 20. The optical beacon head 22 has an optical communication unit 23 for transmitting and receiving optical signals to perform optical communication, and a vehicle detection sensor unit 24 for detecting the presence or absence of a vehicle 6 passing directly under the optical beacon head 22. ing.
The optical communication unit 23 has a transmission unit 25 and a reception unit 26. The transmission unit 25 includes a light projecting unit that transmits an optical signal for optical communication, and has a function of transmitting downlink light composed of near infrared rays. Specifically, the transmission unit 25 has a transmission circuit that converts the downlink data i3 transmitted from the optical beacon controller 21 into a transmission signal, and a light emission that converts the output transmission signal into an optical signal in the downlink direction. It is composed of a light emitting element composed of a diode (LED). Therefore, the transmission unit 25 can transmit the downlink data i3 to the in-vehicle communication device 7 by wireless communication (optical communication).

The receiving unit 26 includes a light receiving unit that receives an optical signal from the vehicle-mounted communication device 7, and has a function of receiving an uplink light composed of near infrared rays from the vehicle-mounted communication device 7. Specifically, the receiving unit 26 includes a light receiving element made of a photodiode or the like, and a light receiving circuit that amplifies an electric signal output by the light receiving element to generate a digital signal. Then, the optical beacon controller 21 generates uplink data from the signal generated by the receiving unit 26. In this way, the receiving unit 26 can receive the uplink data transmitted by the in-vehicle communication device 7 by wireless communication (optical communication).

The optical beacon controller 21 has a communication unit 27 that performs bidirectional communication with the central device 3 and road-to-vehicle communication with the in-vehicle communication device 7. The communication unit 27 includes a communication interface that performs UD type transmission, and when transmitting uplink data i4 to the central device 3, directions L1'to L8 in which the optical beacon head 22 that has received the uplink data i4 is installed. Depending on the', a different communication session is established with the central device 3. The communication unit 27 may be a communication interface that performs U-shaped transmission.

FIG. 13 is an explanatory diagram showing a communication session established between the optical beacon controller 21 and the central device 3 of this reference example, and a data structure of a packet transmitted using the communication session. Each optical beacon controller 21 has the same number (here, eight) of different IP addresses as the number of the optical beacon controllers 21.

The communication unit 27 of the optical beacon controller 21 transmits using a communication session established by a different IP address for each of the plurality of directions L1'to L8'. For example, as shown in FIG. 13, when the uplink data i4 acquired from the optical beacon head 22 installed directly above the inflow path L1'is transmitted to the central device 3, the communication unit 27 sends the source IP address "10". Transmit using the communication session established in "1.1.1.1". Similarly, when transmitting the uplink data i4 acquired from the optical beacon head 22 installed directly above any one of the inflow path L2'to the outflow path L8', the communication unit 27 is the transmission source of the central device 3. From the IP addresses "10.1.1.2" to "10.1.1.1.8", communication sessions established by different source IP addresses are used for transmission as shown in the figure.
At that time, as shown in FIG. 13, the communication unit 27 includes the vehicle information i4 in the data area of the packet and transmits the packet in a state where the source IP address of the communication session is included in the IP header of the packet.

As shown in FIG. 11, the communication unit 301 (see FIG. 5) of the central device 3 is connected to the roadside wireless communication device 4 via the roadside router 9 via a communication line 8b, and an optical beacon is connected via the roadside router 12. It is connected to the controller 21 by a communication line 8c. As a result, the communication unit 301 can receive the packet including the information data transmitted from the transmission unit 404 of the roadside wireless communication device 4, and receives the vehicle information i4 transmitted from the communication unit 27 of the optical beacon controller 21. It is configured to be able to receive packets that include it.

When the communication unit 301 receives the packet including the vehicle information i4 transmitted from the transmission unit 404 of the roadside wireless communication device 4, the processing unit 302 of the central device 3 stores the storage unit 303 in the same manner as in the first reference example described above. The direction is determined by referring to the determination table of FIG. 6 stored in.
Further, when the communication unit 301 receives the packet including the vehicle information i4 transmitted from the communication unit 27 of the optical beacon controller 21, the processing unit 302 uses it between the central device 3 and the optical beacon controller 21. The source IP address included in the IP header of the communication session is acquired, and the route corresponding to this source IP address is determined by referring to the determination table (see FIG. 14) separately stored in the storage unit 303. .. This determination table is a list showing the directions L1'to L8' corresponding to each destination port number "10.1.1.1" to "10.1.1.1.8". For example, when the source IP address included in the IP header of the communication session used by the communication unit 301 is "10.1.1.1", the processing unit 302 refers to the determination table and determines the source IP address. It is determined that the route corresponding to "10.1.1.1" is the inflow route L1'.
The point that the description is omitted in the second reference example is the same as that in the first reference example.

As described above, according to the central device 3 of this reference example, the communication unit 301 is configured to be able to receive not only the vehicle information i4 transmitted by the roadside wireless communication device 4 but also the vehicle information i4 transmitted by the optical beacon 20. Therefore, the central device 3 is the source of the vehicle information i4 even when the vehicle information i4 transmitted from the roadside wireless communication device 4 and the vehicle information i4 transmitted from the optical beacon 20 are mixed. It is possible to determine the route in which a certain vehicle-mounted communication device 7 exists.

[Embodiment]
FIG. 15 is a plan view of a road to which a traffic control system including a roadside radio communication device 4 and a central device 3 according to an embodiment of the present invention is applied. The traffic control system of the present embodiment is a modification of the traffic control system of the first reference example, and more specifically, a modification of the thinning process for reducing the amount of data transmitted from the roadside wireless communication device 4 to the central device 3. An example is shown. The thinning process of the present embodiment is used in the on-site express support system (Fast Emergency Vehicle Preemption Systems: hereinafter referred to as "FAST").

The FAST transmits vehicle information received from an emergency vehicle (specific vehicle) such as a patrol car or an ambulance traveling on the upstream side of an intersection by the roadside radio communication device 4 to the central device 3, and the traffic signal controller 5b is transmitted from the central device 3 to the central device 3. By transmitting a control command to the vehicle, signal control (specific control) is performed to adjust the green light time or the red light time of the inflow path so that the emergency vehicle can pass through the intersection at the green light. This signal control is performed by blue extension control that keeps displaying a green light on the inflow path through which an emergency vehicle passes, or red shortening control that switches to a green light by shortening the display time of the red light as much as possible. In the present embodiment, FAST is performed at a plurality of intersections C1 and C2 existing within the range surrounded by the alternate long and short dash line in the figure.

In addition to FAST, the thinning process of the present embodiment is a signal control (specific) that adjusts the green light time or red light time of the inflow route so that a public vehicle (specific vehicle) such as a fixed-route bus can pass through an intersection at a green light. It can also be applied when other specific controls are performed, such as the Public Transportation Priority System (hereinafter referred to as "PTPS") in which control is performed. Further, the thinning process of the present embodiment may be applied to a general vehicle other than the specific vehicle. In this case, the thinning process of the present embodiment can be used when the traffic signal controller 5b performs sensitive control for a general vehicle. Further, even if the sensitivity control for the general vehicle is not performed, the thinning process of the present embodiment can be similarly used for both the general vehicle and the specific vehicle. Further, the thinning process of the present embodiment may be performed on the specific vehicle, and the thinning process of the first reference example may be performed on the general vehicle.

[Roadside wireless communication device]
FIG. 16 is a functional block diagram showing an internal configuration of the roadside wireless communication device 4 of the present embodiment.
The roadside wireless communication device 4 includes a reception unit 401, a determination unit 402, a transmission unit 404, a storage unit 405, and a transmission determination unit 406. When the transmission determination unit 406 determines that the vehicle 6 is an emergency vehicle based on the vehicle type information included in the information data wirelessly received by the reception unit 401, the transmission determination unit 406 is based on the position of the in-vehicle communication device 7 identified from the information data. Then, it is determined whether or not the transmission unit 404 corresponds to the transmission timing of transmission to the central device (control device) 3 which is another device. The transmission unit 404 transmits vehicle information (mobile information) i4 to the central device 3 when the determination result of the transmission determination unit 406 is positive, that is, when the transmission determination unit 406 determines that the transmission timing is met. The number of transmissions is set to, for example, one.

The transmission timing includes a timing for outputting a command for setting (starting) FAST in the central device 3 and a timing for outputting a command for resetting (ending) FAST. The transmission determination unit 406 is adapted to make different determinations based on a plurality of transmission modes configured by using one or both of these two timings.
As the plurality of transmission modes, "set transmission" that only outputs a command to set FAST, "reset transmission" that only outputs a command to reset FAST, and both commands to reset and set FAST are the same. There are four types: "shared transmission" that outputs at the timing, and "combined transmission" that outputs both commands for resetting and setting FAST at different timings.

These transmission modes are preset for each of the directions L1 to L8 in the transmission determination table (see FIG. 17) stored in the storage unit 405 according to the FAST implementation area, the road length between the intersections, and the like. Has been done. In the present embodiment, as shown in FIG. 17, the set transmission is set to "01", the reset transmission is set to "10", the shared transmission is set to "00", and the combined transmission is set to "11", which are stored in the transmission determination table. .. Here, the transmission form of the inflow path L1, L2, L4 is set transmission, the transmission form of the inflow path L3 is shared transmission, the transmission form of the outflow path L5, L6, L8 is reset transmission, and the transmission form of the inflow path L7 is combined transmission. It is set as each.
In the transmission determination table, a distance D, which will be described later, is set for each of the directions L1 to L8.

When the transmission mode is set transmission, the transmission determination unit 406 sets the transmission timing for setting the FAST when the in-vehicle communication device 7 exists in the vicinity range of the predetermined position in the predetermined area (narrow area). Judge as applicable. Here, the "neighborhood range of a predetermined position" means a predetermined position and a range in the vicinity thereof.
As shown in FIG. 15, the predetermined area is composed of a plurality of areas S1 to S8. Each area S1 to S8 is a range including a preset installation position of an optical beacon (white circle portion shown in each route in the figure) in each route L1 to L8, and the optical beacon is optical. It is set within the range where communication is possible. In the present embodiment, the installation position of the optical beacon is set to the predetermined position.

The neighborhood range of the predetermined position is from the first distance (D-α) to the second using, for example, the first distance (D-α) and the second distance (D + β) with respect to the intersection C2 (predetermined point). It is set as a range up to the distance (D + β) (however, the case where the second distance (D + β)> the first distance (D-α) and the first distance (D-α) = 0 is also included). Note that D is the distance from the intersection C2 to the predetermined position (the position where the optical beacon is installed), α and β are arbitrary values, and α ≧ 0 and β ≧ 0. Therefore, the transmission determination unit 406 sets the transmission timing when the distance from the intersection C2 to the position where the vehicle-mounted communication device 7 exists is within the range from the first distance (D−α) to the second distance (D + β). Judge as applicable.
The first distance and the second distance are based on the intersection C2, but may be based on any other point such as a stop line in front of the intersection C2.
Further, the neighborhood range of the predetermined position may be set as a predetermined coordinate range. In this case, for example, by setting the coordinate range to a range that satisfies the relationship of a1 ≦ x ≦ a2 and b1 ≦ y ≦ b2 with respect to the position coordinates (x, y) of the in-vehicle communication device 7, the transmission determination unit 406 , When this relationship is satisfied, it can be determined that the transmission timing is applicable.
Further, when the receiving unit 401 of the roadside wireless communication device 4 receives the information data from the vehicle-mounted communication device 7 located on the upstream side of the predetermined position, the transmission determination unit 406 receives the information data from the vehicle-mounted communication device 7 from the information data. It is also possible to calculate the time required for the user to pass the predetermined position (= remaining distance / speed to the predetermined position), and to determine that the transmission timing corresponds to the time when the required time elapses.

When the transmission mode is reset transmission, the transmission determination unit 406 determines that it corresponds to the transmission timing for resetting the FAST when the in-vehicle communication device 7 flows into the predetermined area.
When the transmission mode is shared transmission, the transmission determination unit 406 sets the transmission timing for resetting the FAST and the FAST when the in-vehicle communication device 7 exists in the vicinity range of the predetermined position in the predetermined area. It is judged that it corresponds to the transmission timing of.

When the transmission mode is combined transmission, the transmission determination unit 406 individually determines a plurality of transmission timings set in a predetermined area. Specifically, the transmission determination unit 406 determines that the transmission timing corresponds to the transmission timing for resetting the FAST by the determination method in the case of the reset transmission described above, and sets the transmission timing in which the FAST is set by the determination method in the case of the set transmission described above. Judge as applicable.

In the present embodiment, the upstream end side of the areas S5 to S8 of each outflow path L5 to L8 is set to a range including the inside of the intersection C2. Therefore, the transmission timing for resetting the FAST in each outflow path L5 to L8 is the time when the in-vehicle communication device 7 flows into each area S5 to S8, that is, the time when it flows into the intersection C2 (black circles shown in each outflow path in the figure). ), Therefore, the FAST performed at the intersection C2 can be quickly reset.

[Centralized Traffic Control]
FIG. 18 is a functional block diagram showing the internal configuration of the central device 3. The central device 3 includes a communication unit 301, a processing unit 302, a storage unit 303, and a control unit 304 inside.
When the control unit 304 determines that the vehicle 6 is an emergency vehicle based on the vehicle type information included in the vehicle information i4 received from the roadside wireless communication device 4, the in-vehicle communication device determined by the processing unit 302 Based on the direction in which 7 exists, the command to set the FAST and the command to reset the FAST are selectively output. The command output from the control unit 304 is transmitted from the communication unit 301 to the traffic signal controller 5b.

The control unit 304 refers to the control determination table (see FIG. 19) stored in the storage unit 303, specifies the type of transmission mode set for each of the directions L1 to L8, and corresponds to each transmission mode. The command to set the FAST and the command to reset the FAST are selectively output.
Specifically, when the transmission mode is set transmission, the control unit 304 outputs a command to set FAST, and when the transmission mode is reset transmission, the control unit 304 outputs a command to reset FAST. When the transmission mode is shared transmission, the control unit 304 continuously outputs a command for resetting FAST and a command for setting FAST in this order. Further, when the transmission mode is combined transmission, the control unit 304 outputs a command to reset the FAST when the vehicle information i4 of the emergency vehicle is first received from the roadside radio communication device 4, and then the roadside radio communication device 4 outputs a command to reset the FAST. When the vehicle information i4 of the emergency vehicle is received again, a command to set FAST is output.

[Transmission timing judgment processing]
FIG. 20 is a flowchart showing a transmission timing determination process executed by the roadside wireless communication device 4. 21 to 24 are flowcharts showing determination processes when the transmission modes are set transmission, reset transmission, shared transmission, and combined transmission. Hereinafter, the transmission timing determination process executed by the roadside wireless communication device 4 will be described with reference to FIGS. 20 to 24.
As shown in FIG. 20, first, when the receiving unit 401 of the roadside wireless communication device 4 wirelessly receives the information data transmitted by the in-vehicle communication device 7 (step ST1), the vehicle type recognized from the information data is an emergency vehicle. It is confirmed whether or not it is (step ST2). If the vehicle type is not an emergency vehicle, the process returns to step ST1.

When it is confirmed in step ST2 that the vehicle type is an emergency vehicle, the in-vehicle communication device 7 which is the transmission source of the vehicle based on the position information included in the information data wirelessly received by the reception unit 401 by the determination unit 402. Determine the direction in which is present (step ST3). The determined direction is stored in the storage unit 405 (step ST4).

Next, the transmission determination unit 406 confirms the transmission mode corresponding to the route stored in the storage unit 405 with reference to the transmission determination table (see FIG. 17). When the transmission mode is set transmission (when "Yes" in step ST5), the transmission determination unit 406 performs a determination process corresponding to set transmission (step ST6). Further, when the transmission mode is reset transmission (when “Yes” in step ST7), the transmission determination unit 406 performs a determination process corresponding to reset transmission (step ST8). Further, when the transmission mode is shared transmission (when “Yes” in step ST9), the transmission determination unit 406 performs a determination process corresponding to the shared transmission (step ST10). When the transmission mode is combined transmission (“No” in step ST9), the transmission determination unit 406 performs a determination process corresponding to the combined transmission (step ST11).

As shown in FIG. 21, when the transmission mode is set transmission, the transmission determination unit 406 first confirms whether or not transmission for setting FAST has already been performed (step ST21). If transmission for setting FAST has already been performed, the transmission determination unit 406 ends the determination process.
On the other hand, when the transmission for setting the FAST has not been performed yet, the transmission determination unit 406 has the in-vehicle communication device 7 from the intersection based on the position information included in the information data wirelessly received by the reception unit 401. The distance to the position is calculated (step ST22). Then, the transmission determination unit 406 refers to the transmission determination table, specifies the distance D corresponding to the direction stored in the storage unit 405, and the distance calculated in step ST22 is the first distance (D−α). It is determined whether or not it is within the range from to the second distance (D-β) (step ST23).

If the determination result in step ST23 is affirmative, the transmission determination unit 406 determines that it is the transmission timing for setting the FAST, and the transmission unit 404 transmits the vehicle information i4 to the central device 3 (step ST24). .. After that, the transmission determination unit 406 stores in the storage unit 405 that the transmission for setting the FAST has been performed (step ST25), and ends the determination process.
On the other hand, when the determination result in step ST23 is negative, the transmission determination unit 406 ends the determination process without causing the central device 3 to transmit the vehicle information i4.

As shown in FIG. 22, when the transmission mode is reset transmission, the transmission determination unit 406 first confirms whether or not transmission for resetting FAST has already been performed (step ST31). If transmission for resetting FAST has already been performed, the transmission determination unit 406 ends the determination process.
On the other hand, when the transmission for resetting the FAST has not been performed yet, the transmission determination unit 406 determines that it is the transmission timing for resetting the FAST, and the transmission unit 404 transmits the vehicle information i4 to the central device 3. (Step ST32). After that, the transmission determination unit 406 stores in the storage unit 405 that the transmission for resetting the FAST has been performed (step ST33), and ends the determination process.

As shown in FIG. 23, when the transmission mode is shared transmission, the transmission determination unit 406 first confirms whether or not transmission for resetting and setting FAST has already been performed (step ST41). If transmission for resetting and setting FAST has already been performed, the transmission determination unit 406 ends the determination process.
On the other hand, when the transmission for resetting and setting the FAST has not been performed yet, the transmission determination unit 406 sends the in-vehicle communication device 7 from the intersection based on the position information included in the information data wirelessly received by the reception unit 401. The distance to the existing position is calculated (step ST42). Then, the transmission determination unit 406 refers to the transmission determination table, specifies the distance D corresponding to the direction stored in the storage unit 405, and the distance calculated in step ST42 is the first distance (D−α). It is determined whether or not it is within the range from to the second distance (D-β) (step ST43).

If the determination result in step ST43 is affirmative, the transmission determination unit 406 determines that it is the transmission timing for resetting and setting the FAST, and the transmission unit 404 transmits the vehicle information i4 to the central device 3 (step). ST44). After that, the transmission determination unit 406 stores in the storage unit 405 that the transmission for resetting and setting the FAST has been performed (step ST45), and ends the determination process.
On the other hand, if the determination result in step ST43 is negative, the transmission determination unit 406 ends the determination process without causing the central device 3 to transmit the vehicle information i4.

As shown in FIG. 24, when the transmission mode is combined transmission, the transmission determination unit 406 first confirms whether or not transmission for resetting FAST has already been performed (step ST51). If the transmission for resetting the FAST has already been performed, the process proceeds to step ST54.
On the other hand, when the transmission for resetting the FAST has not been performed yet, the transmission determination unit 406 determines that it is the transmission timing for resetting the FAST, and the transmission unit 404 transmits the vehicle information i4 to the central device 3. (Step ST52). After that, the transmission determination unit 406 stores in the storage unit 405 that the transmission for resetting the FAST has been performed (step ST53).

Next, the transmission determination unit 406 confirms whether or not transmission for setting FAST has already been performed (step ST54). If transmission for setting FAST has already been performed, the transmission determination unit 406 ends the determination process.
On the other hand, when the transmission for setting the FAST has not been performed yet, the transmission determination unit 406 has the in-vehicle communication device 7 from the intersection based on the position information included in the information data wirelessly received by the reception unit 401. The distance to the position is calculated (step ST55). Then, the transmission determination unit 406 refers to the transmission determination table, specifies the distance D corresponding to the direction stored in the storage unit 405, and the distance calculated in step ST55 is the first distance (D−α). It is determined whether or not it is within the range from to the second distance (D-β) (step ST56).

At that time, immediately after the vehicle information i4 is transmitted to the central device 3 at the transmission timing for resetting the FAST in step 52, the calculated distance is from the first distance (D-α) to the second distance (D-β). ), The determination result in step ST23 is negative, and the transmission determination unit 406 temporarily ends the determination process.
After that, when the vehicle-mounted communication device 7 moves to the above-mentioned predetermined position, when the receiving unit 401 of the roadside wireless communication device 4 wirelessly receives the information data of the vehicle-mounted communication device 7 in step ST1 of FIG. 20, the step of FIG. 20 The transmission determination shown in FIG. 24 is performed again through ST3 to ST11.

In this re-judgment, since the transmission for resetting the FAST has already been performed as described above, the process proceeds from step ST51 to step ST54 and step ST55 to step ST56, and the transmission determination unit 406 calculates in step ST55. It is determined whether or not the distance is within the range from the first distance (D-α) to the second distance (D-β). If the determination result in step ST55 is affirmative, the transmission determination unit 406 determines that it is the transmission timing for setting the FAST, and the transmission unit 404 transmits the vehicle information i4 to the central device 3 (step ST57). ). After that, the transmission determination unit 406 stores in the storage unit 405 that the transmission for setting the FAST has been performed (step ST58), and ends the determination process.

[Command processing of centralized traffic control]
FIG. 25 is a flowchart showing a FAST command process executed by the central device 3. As shown in FIG. 25, when the communication unit 301 of the central device 3 receives the vehicle information i4 transmitted by the transmission unit 404 of the roadside wireless communication device 4 (step SS1), the vehicle vehicle type recognized from the vehicle information i4 is Check if it is an emergency vehicle (step SS2). If the vehicle type is not an emergency vehicle, the process returns to step SS1.

When it is confirmed in step SS2 that the vehicle type is an emergency vehicle, the control unit 304 refers to the control determination table (see FIG. 19) to obtain a transmission mode corresponding to the route stored in the storage unit 303. Check. When the transmission mode is set transmission (when “Yes” in step SS3), the control unit 304 outputs a command for setting FAST to the communication unit 301 (step SS4).
If the transmission mode is reset transmission (“Yes” in step SS5), the control unit 304 outputs a command to reset the FAST to the communication unit 301 (step SS6).
If the transmission mode is shared transmission (“Yes” in step SS7), the control unit 304 outputs a command to reset the FAST to the communication unit 301 (step SS8), and then issues a command to set the FAST. Output to the communication unit 301 (step SS9).

When the transmission mode is combined transmission (“No” in step SS7), the control unit 304 first confirms whether or not transmission for resetting FAST has already been performed (step SS10). If transmission for resetting FAST has already been performed, the transmission determination unit 406 ends the command processing.
On the other hand, if the transmission for resetting the FAST has not been performed yet, the control unit 304 outputs a command for resetting the FAST to the communication unit 301 (step SS11). After that, the control unit 304 stores in the storage unit 303 that the command to reset the FAST is output (step SS12), and returns to step SS1 once.

Then, in step SS1, when the communication unit 301 of the central device 3 receives the vehicle information i4 from the roadside wireless communication device 4 again, the process proceeds to step SS10 via step SS2, step SS5 and step SS7, and the control unit 304 moves to step SS10. , Check if the transmission to reset FAST has already been done. Here, since the transmission for resetting the FAST has already been performed as described above, the control unit 304 proceeds to step SS13 and outputs a command for setting the FAST to the communication unit 301.
The point that the description is omitted in this embodiment is the same as that of the first reference example.

As described above, according to the roadside wireless communication device 4 of the present embodiment, it is determined whether or not the transmission unit 404 corresponds to the transmission timing of transmission to the central device 3 based on the position of the vehicle-mounted communication device 7, and the determination result is Since the vehicle information i4 is transmitted to the central device 3 when the result is positive, the amount of data transmitted to the central device 3 can be reduced (thinned out). As a result, the transmission processing load of the roadside wireless communication device 4 can be reduced, and the processing load of the central device 3 can be reduced.

Further, since the number of transmissions from the transmission unit 404 to the central device 3 is set to one, the amount of data transmitted to the central device 3 can be further reduced.
Further, the transmission determination unit 406 transmits the vehicle information i4 of the emergency vehicle to the central device 3 in order to determine whether or not the transmission timing is applicable when the vehicle 6 equipped with the in-vehicle communication device 7 is an emergency vehicle. The amount of data to be transmitted can be reduced.

Further, when the vehicle-mounted communication device 7 exists in the vicinity of the vicinity range of the predetermined position in the predetermined area, the vehicle information i4 for setting the FAST is transmitted, so that the vehicle-mounted communication device 7 is within the predetermined area. FAST can be reliably set when present in.
Further, since the preset installation position of the optical beacon in the predetermined area can be diverted as the predetermined position for determining the existence of the in-vehicle communication device 7, the roadside wireless communication device 4 can perform FAST. The amount of repair can be reduced.
Further, since the roadside wireless communication device 4 has a wider communication range than the optical beacon, if an emergency vehicle enters the communication range of the roadside wireless communication device 4, the vehicle-mounted communication device 7 passes through the roadside wireless communication device 4. The central device 3 that has received the vehicle information i4 outputs a command to set the FAST to the traffic signal controller 5b on the premise that the emergency vehicle exists at the installation position of the optical beacon when the vehicle information i4 is received. In that case, there is a risk that the green light will not be properly reached when the emergency vehicle approaches the intersection.
On the other hand, in the present embodiment, since the installation position of the optical beacon is set to a predetermined position for determining the existence of the in-vehicle communication device 7, the central device 3 is set from the in-vehicle communication device 7 of the emergency vehicle via the optical beacon. Whether the vehicle information i4 is transmitted to the central device 3 or the vehicle information i4 is transmitted from the in-vehicle communication device 7 of the emergency vehicle to the central device 3 via the roadside wireless communication device 4, the FAST command is given. Can be done properly.

Further, the transmission determination unit 406 determines whether or not the in-vehicle communication device 7 exists within the range from the first distance (D-α) to the second distance (D-β) or within a predetermined coordinate range. Therefore, it is possible to easily determine whether or not the in-vehicle communication device 7 exists in the predetermined area.
Further, since the vehicle information i4 for resetting the FAST is transmitted when the in-vehicle communication device 7 flows into the predetermined area, the FAST is quickly reset when the in-vehicle communication device 7 flows into the predetermined area. Can be done.

Further, since a plurality of transmission timings are set in the predetermined area, the installation cost can be suppressed as compared with the case where a plurality of optical beacons are installed in the predetermined area and the transmission timings are set.
Further, when the central device 3 receives the vehicle information i4 from the roadside wireless communication device 4 when the in-vehicle communication device 7 flows into the predetermined area, the central device 3 outputs a command to reset the FAST, so that the FAST is reset more quickly. Can be done.

[Modification example]
FIG. 26 shows a modification of the control device of the above embodiment, and is a functional block diagram showing an internal configuration of the control device. In the above embodiment, the central device 3 is used as a control device, but in this modification, a roadside wireless communication device (other device) 14 different from the roadside wireless communication device 4 of the above embodiment also serves as a control device. The roadside wireless communication device 14 includes a reception unit 401, a determination unit 402, a transmission unit 404, a storage unit 405, and a control unit 407. Since the receiving unit 401, the determination unit 402, the transmitting unit 404, and the storage unit 405 have the same configuration as the roadside wireless communication device 4 of the first reference example, the description thereof will be omitted.

When the control unit 407 determines that the vehicle 6 is an emergency vehicle based on the vehicle type information included in the vehicle information i4 received from the roadside wireless communication device 4 by the reception unit 401, the in-vehicle communication device determined by the determination unit 402. Based on the direction in which 7 exists, the command to set the FAST and the command to reset the FAST are selectively output. Specifically, the control unit 407 refers to the control determination table (see FIG. 19) stored in the storage unit 405, identifies the transmission mode corresponding to the direction determined by the determination unit 402, and identifies the transmission mode. A command to set the FAST and a command to reset the FAST are selectively output based on the transmission mode. The command output from the control unit 407 is transmitted from the transmission unit 404 to the traffic signal controller 5b.

FIG. 27 shows another modification of the roadside wireless communication device 4 and the central device 3 of the above embodiment, and FIG. 27A is a functional block diagram showing the internal configuration of the roadside wireless communication device 4 (b). ) Is a functional block diagram showing the internal configuration of the central device 3. In the above embodiment, the roadside wireless communication device 4 performs the transmission timing determination process, but in this modification, the central device 3 performs the transmission timing determination process. Then, in this modification, the control system is composed of the roadside wireless communication device 4 and the central device 3.

As shown in FIG. 27 (a), the roadside wireless communication device 4 of this modified example includes a receiving unit 401, a transmitting unit 404, and a storage unit 405 inside. The transmission unit 404 is configured to transmit the information data wirelessly received by the reception unit 401 (including the position information that can identify the position of the vehicle-mounted communication device 7) to the central device 3. The transmission unit 404 may transmit a part of the information data (including position information, speed information, etc.) wirelessly received by the reception unit 401 to the central device 3.

As shown in FIG. 27B, the central device 3 of this modification includes a communication unit 301, a storage unit 303, a control unit 304, and a control determination unit 305 inside. The communication unit 301 receives the information data transmitted by the transmission unit 404 of the roadside wireless communication device 4. Whether or not the control determination unit 305 outputs a command related to FAST, that is, a command for setting FAST and a command for resetting, based on the position of the in-vehicle communication device 7 identified from the information data received by the communication unit 301. Is determined respectively.

The determination as to whether or not it is the timing to output the command to set the FAST is determined by, for example, the information data received by the communication unit 301, as in the determination made by the transmission determination unit 406 of the roadside wireless communication device 4 of the above embodiment. Based on the included position information, the distance from the intersection to the position where the in-vehicle communication device 7 exists is calculated, and this calculated distance is within the range from the first distance (D-α) to the second distance (D-β). Judgment is made based on whether or not.
Further, the determination as to whether or not it is the timing to output the command to reset the FAST is determined by, for example, the in-vehicle communication device 7 in the predetermined area as in the determination made by the transmission determination unit 406 of the roadside wireless communication device 4 of the above embodiment. Judgment is made based on whether or not it has flowed into.

When the control unit 304 of the central device 3 determines that it is the timing for the control determination unit 305 to output the command to set the FAST, the control unit 304 outputs the command to set the FAST to the communication unit 301. Further, when the control unit 304 determines that it is the timing to output the command to reset the FAST, the control unit 304 outputs the command to reset the FAST to the communication unit 301.
When the control unit 304 of the central device 3 determines the timing of outputting a command, the information calculated based on the information data first received from the roadside radio communication device 4 is obtained from the roadside radio communication device 4 after a certain period of time has elapsed. It can be reviewed based on the received information data. For example, the control unit 304 calculates the timing and outputs a command based on the information data received when the in-vehicle communication device 7 is located far away from the intersection, but the in-vehicle communication device 7 approaches the vicinity of the intersection. If the timing shifts at that time, the control unit 304 can output the command again. In this case, since the traffic signal controller 5 side receives the commands from the central device 3 two or more times, it is sufficient to distinguish between these commands.

As described above, according to the control system of the present modification, the roadside wireless communication device 4 transmits the information data acquired from the vehicle-mounted communication device 7 to the central device 3, so that the central device 3 is identified from the information data. It is possible to easily determine each timing for outputting a command to set and reset the FAST based on the position of the in-vehicle communication device 7.
Further, in this modification, the central device 3 receives information on the position of the vehicle from the roadside communication device 4 and performs a timing determination process for outputting a command related to FAST. It includes a higher-level device that performs determination processing and a lower-level device that provides the information to the higher-level device. Therefore, in the lower device, the amount of repair of the upper device can be reduced by converting the information regarding the position of the vehicle and the like into the same telegram format as the conventional optical beacon.

It should be noted that the embodiments disclosed this time are exemplary in all respects and are not considered to be restrictive. 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.
For example, in the above reference example, the route is determined by using the destination port number or the source IP address, but the route may be determined by the source port number or the destination IP address. At that time, when the destination IP address is used, it is sufficient that the central device 3 side has a plurality of IP addresses corresponding to these destination IP addresses.
Further, in the above reference example, the route is determined by using one of the port number and the IP address, but the route may be determined by using both the port number and the IP address.

3 Central unit 301 Communication unit 302 Processing unit 303 Storage unit 304 Control unit 305 Control judgment unit 4 Roadside wireless communication device 401 Reception unit 402 Judgment unit 404 Transmission unit 405 Storage unit 406 Transmission judgment unit 407 Control unit 5 Traffic signal 5a Traffic signal 5b Traffic signal controller 6 Vehicle 7 In-vehicle communication device (mobile communication device)
8a Communication line 8b Communication line 8c Communication line 9 Roadside router 10 Network network 11 Router 12 Roadside router 14 Roadside wireless communication device 20 Optical beacon 21 Optical beacon controller 22 Optical beacon head 23 Optical communication unit 24 Vehicle detection sensor unit 25 Transmission unit 26 Receiver 27 Communication section C Intersection C'Intersection C1 to C3 Intersection D Distance i1 Signal control information i2 Execution information i3 Information i4 Vehicle information (moving object information)
L1 to L4 Inflow route L5 to L8 Outflow route L1'to L4'Inflow route L5' to L8' Outflow route Pa1 to Pa16 port Pb1 to Pb16 port R Road S1 to S8 area (predetermined area)

Claims (10)

A receiver that wirelessly receives information data that is transmitted from the mobile communication device and includes information that can identify the position of the mobile communication device.
A roadside wireless communication device including a transmitting unit that transmits mobile information included in the information data wirelessly received by the receiving unit to another device.
A transmission determination unit that determines whether or not the transmission unit corresponds to the transmission timing of transmission to the other device based on the position of the mobile communication device identified from the information data wirelessly received by the reception unit. With
The transmission unit is configured to transmit the mobile body information to the other device when the determination result of the transmission determination unit is positive .
The transmission determination unit is configured to determine that the transmission timing is applicable when the mobile communication device is present in a range near a predetermined position in a predetermined area.
The predetermined area is an area including a preset installation position of the optical beacon, and is an area in which the optical beacon can perform optical communication. A roadside wireless communication device. The roadside wireless communication device according to claim 1, wherein the number of transmissions from the transmission unit to the other device is set to one. The mobile communication device is an in-vehicle communication device mounted on a vehicle.
The information data includes information that can identify the vehicle as a specific vehicle.
The transmission determination unit is configured to determine whether or not the transmission timing is applicable when the vehicle is the specific vehicle based on the information data wirelessly received by the reception unit. The roadside wireless communication device according to claim 1 or 2. And the transmission unit, the roadside communication equipment according to any one of claims 3 to Der Ru <br/> claim 1 which transmits the moving object information to initiate a specific control. The roadside wireless communication device according to any one of claims 1 to 4, wherein the predetermined position is the installation position of the optical beacon. The neighborhood range of the predetermined position is a range from the first distance to the second distance with respect to the predetermined point (however, the case where the second distance> the first distance and the first distance = 0 is also included). Ori,
Claim 1 is configured such that the transmission determination unit determines that the transmission timing is applicable when the mobile communication device exists within the range from the first distance to the second distance. The roadside wireless communication device according to any one of claims 5. The neighborhood range of the predetermined position is a predetermined coordinate range.
The method according to any one of claims 1 to 5, wherein the transmission determination unit is configured to determine that the transmission timing is applicable when the mobile communication device is within the coordinate range. Roadside wireless communication device. The transmitter transmits the mobile information in order to terminate a specific control.
The roadside according to any one of claims 1 to 7, wherein the transmission determination unit is configured to determine that the transmission timing is met when the mobile communication device flows into a predetermined area. Wireless communication device. The roadside wireless communication device according to any one of claims 1 to 8 , wherein a plurality of transmission timings are set in the predetermined area. A receiving unit that wirelessly receives information data that is transmitted from the mobile communication device and includes information that can identify the position of the mobile communication device, and a transmitting unit that wirelessly receives the information data that the receiving unit transmits to the outside. With a roadside wireless communication device,
A communication unit that receives the information data transmitted by the transmission unit of the roadside wireless communication device, and outputs a command related to a specific control based on the position of the mobile communication device identified from the information data received by the communication unit. A control determination unit for determining whether or not the timing is to be performed, and a control device having a control unit for outputting the command when the determination result of the control determination unit is positive are provided .
The control determination unit is configured to determine that the timing corresponds to the timing when the mobile communication device exists in a range near a predetermined position in a predetermined area.
The predetermined area is an area including a preset installation position of the optical beacon, and is an area in which the optical beacon can perform optical communication . <br /> A control system.

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