WO2009118906A1 - Base station device, in-vehicle apparatus, radio communication system, information transmitting method and information receiving method - Google Patents

Abstract

A radio base station device (140) comprises an intersection information receiving unit (210) for receiving entry enabled/disabled information indicating whether a vehicle located in a region on a road serving as a transmission object is permitted to enter an intersection of the road and another road from a road-side device, a radio transmission judging unit (260) for judging whether the entry enable/disabled information received by the intersection information receiving unit (210) indicates that the vehicle is permitted to enter the intersection, and a radio transmitting unit (270) for, when it is judged by the radio transmission judging unit (260) that the entry enabled/disabled information indicates that the vehicle is permitted to enter the intersection, transmitting by radio road safety information on a road in the direction of travel of the vehicle to an in-vehicle apparatus installed in the vehicle on the road serving as the transmission object permitted to enter the intersection. The number of channels used for ratio communication at the intersection can be thus reduced.

Description

Base station apparatus, in-vehicle device, wireless communication system, information transmission method and information reception method

The present invention relates to a base station device, an in-vehicle device, a wireless communication system, an information transmission method, and an information reception method, and more particularly to road-to-vehicle communication between a road-side device installed on a road side and an on-vehicle device mounted on a vehicle. .

Conventionally, in order to realize congestion relief, smooth traffic and pedestrian safety at the intersection, between the vehicle entering the intersection from the road and the radio base station device arranged to control the road, For example, a wireless communication system that performs narrow-area communication by a DSRC (Dedicated Short Range Communication) method is being realized. That is, the radio base station device transmits a radio signal obtained by modulating information around an intersection into a channel in a band defined by the DSRC standard for a vehicle entering the intersection from a road. Here, the number of channels in the band that can be used according to the DSRC standard is 7, but since 2 channels are already assigned to ETC (Electronic Toll Collection System), 5 channels can be used practically. ing.

By the way, as another example of the wireless communication system using such narrow area communication, communication between a vehicle and a vehicle can be cited. Specifically, for example, a communication device mounted on a vehicle detects a traveling direction of the host vehicle using a GPS receiver, determines a communication channel based on the traveling direction, and transmits to another vehicle. There is a case where communication is performed with a mounted communication device (for example, Patent Document 1). In addition, as a wireless communication system that performs communication between an emergency vehicle and another vehicle, a technique for notifying the approach of an emergency vehicle from the emergency vehicle to another vehicle by wireless communication based on the DSRC standard is disclosed (Patent Document 2).

JP 2004-062381 A JP 2004-355272 A

However, the conventional wireless communication system using narrow area communication has a problem that the number of channels used at the intersection may be insufficient.

As a specific example, a problem related to a channel used at an intersection will be described with reference to FIGS. 17, 18, 19, and 20. 17, 18, 19 and 20 are diagrams illustrating transmission of information from the radio base station apparatus to the vehicle. As shown in FIGS. 17, 18, 19, and 20, radio base station devices (A ′, B ′, C ′, D ′) are arranged at corners where roads intersect, and each radio base station device Transmits information with directivity.

First, in FIG. 17, each radio base station apparatus (A ′, B ′, C ′, D ′) is around the intersection in the direction of the road connecting to the intersection from the opposite side of the own radio base station apparatus across the intersection. Is transmitted to the same channel chA. For example, the radio base station apparatus A ′ transmits a radio signal obtained by modulating the information α around the intersection to the channel chA to the road where the vehicle A is located. When the vehicle A enters the intersection, the vehicle A receives the transmitted information α.

In this case, since areas where information is transmitted by the same channel chA from each radio base station apparatus (A ′, B ′, C ′, D ′) overlap, radio signals interfere with each other at the overlapping points, A vehicle entering the intersection from the road cannot receive normal information.

Next, in FIG. 18, each radio base station apparatus (A ′, B ′, C ′, D ′) has an area transmitted by another radio base station apparatus in the direction of the road where the own radio base station apparatus is in contact. Radio signals obtained by modulating the information around the intersection to the same channel chA are transmitted so as not to overlap.

In this case, areas where information is transmitted from the respective radio base station devices (A ′, B ′, C ′, D ′) through the same channel chA do not overlap, but information is not transmitted within the intersection, so from the road A vehicle entering an intersection cannot obtain the latest and accurate information.

Further, in FIG. 19, each radio base station apparatus (A ′, B ′, C ′, D ′) transmits different information around the intersection (chA, chB, chC) near the intersection of the road across the intersection. , ChD) is transmitted. In this case, each radio base station apparatus (A ′, B ′, C ′, D ′) is used for all vehicles (A, B, C, D) entering the intersection from the roads connected to the intersection. Information can be transmitted reliably. However, as described above, the number of channels that can be used according to the DSRC standard is 5 channels excluding the channels assigned to the ETC, so when 4 channels are used at the intersection, the remaining is 1 channel. At this time, if you want to use 4 channels at adjacent intersections, if the distance between the intersections is short, even if the propagation intensity of each channel is minimized, communication will interfere with each other. End up. That is, there is a problem that the number of channels used at the intersection may be insufficient.

As shown in FIG. 20, when two intersections are close to each other, at one intersection, as in FIG. 19, each radio base station apparatus (A ′, B ′, C ′, D ′) sandwiches the intersection. A radio signal obtained by modulating information around the intersection into different channels (chA, chB, chC, chD) is transmitted near the intersection of the road. At the other adjacent intersection, each radio base station device (E ′, F ′, G ′, H ′) transmits information around the intersection in different channels (chA, chB, Radio signals modulated to chC and chE) are transmitted. Then, an area where the information γ is transmitted from the radio base station apparatus B ′ at one intersection by the channel chB, and an area where the information κ is transmitted by the channel chB from the radio base station apparatus F ′ at the other adjacent intersection. The vehicle G entering the overlapped portion cannot receive normal information due to radio signal interference.

Further, in FIGS. 17 to 20, the intersection is a crossroad, but if the intersection is six or more, the number of channels used by the radio base station apparatus at the intersection is six or more, and the number of channels that can be used according to the DSRC standard is Since there are 5 channels excluding channels allocated to ETC, the number of channels is insufficient. In particular, if channels are assigned to the wireless communication system between vehicles described in Patent Document 1 and Patent Document 2, the number of channels is further insufficient.

The present invention has been made in view of the above, and provides a base station device, an in-vehicle device, a wireless communication system, an information transmission method, and an information reception method capable of reducing the number of channels used for wireless communication at an intersection. The purpose is to provide.

In order to solve the above-described problem and achieve the object, the base station apparatus determines whether a vehicle located in an area on the road to be transmitted is permitted to enter an intersection between the road and another road. A determination unit that determines whether or not the entry permission information received by the receiving unit indicates permission to enter a vehicle intersection, and the determination. When it is determined by the unit that the entry permission / inhibition information indicates permission to enter the intersection of the vehicle, the vehicle is in the traveling direction of the vehicle on the transmission target road permitted to enter the intersection. And a transmission unit that wirelessly transmits road safety information of the road.

According to such a configuration, the base station device transmits information to a vehicle that is permitted to enter the intersection when the entry permission information indicates that the vehicle is permitted to enter the intersection. Assuming that no information is transmitted at the time of permission, the same channel as the own base station device can be assigned to another base station device when the entry permission / prohibition information is not permitted, thus reducing the number of channels used at the intersection. Can be made.

The base station apparatus, in-vehicle device, wireless communication system, information transmission method, and information reception method disclosed in this specification have an effect that the number of channels used for wireless communication at an intersection can be reduced.

FIG. 1 is a diagram illustrating an example of the overall configuration of the wireless communication system according to the first embodiment. FIG. 2 is a block diagram of the radio base station apparatus according to the first embodiment. FIG. 3 is a block diagram of the in-vehicle device according to the first embodiment. FIG. 4 is a flowchart illustrating an outline of processing of the radio base station apparatus according to the first embodiment. FIG. 5 is a flowchart illustrating a processing outline of the in-vehicle device according to the first embodiment. FIG. 6 is a diagram illustrating transmission of information from the radio base station apparatus according to the first embodiment to the vehicle. FIG. 7 is a diagram illustrating an example of the overall configuration of the wireless communication system according to the second embodiment. FIG. 8 is a diagram illustrating transmission of information from the radio base station apparatus according to the second embodiment to a vehicle. FIG. 9 is a flowchart illustrating an outline of processing of the radio base station apparatus according to the second embodiment. FIG. 10 is a diagram illustrating an example of the overall configuration of the wireless communication system according to the third embodiment. FIG. 11 is a block diagram of the radio base station apparatus according to the third embodiment. FIG. 12 is a diagram illustrating transmission of information from the radio base station apparatus according to the third embodiment to the vehicle. FIG. 13 is a flowchart illustrating an outline of processing of the radio base station apparatus according to the third embodiment. FIG. 14 is a diagram illustrating an example of the overall configuration of the wireless communication system according to the fourth embodiment. FIG. 15 is a diagram illustrating transmission of information from the radio base station apparatus according to the fourth embodiment to a vehicle. FIG. 16 is a diagram illustrating transmission of information from the radio base station apparatus according to the fourth embodiment to a vehicle. FIG. 17 is a diagram illustrating transmission of information from a radio base station apparatus according to the related art to a vehicle. FIG. 18 is a diagram illustrating transmission of information from the radio base station apparatus according to the related art to the vehicle. FIG. 19 is a diagram illustrating transmission of information from the radio base station apparatus according to the related art to the vehicle. FIG. 20 is a diagram illustrating transmission of information from the radio base station apparatus according to the related art to the vehicle.

Explanation of symbols

DESCRIPTION OF SYMBOLS 110 Intersection information collection apparatus 120 Signal information collection apparatus 140 Radio base station apparatus 150 In-vehicle apparatus 210 Intersection information reception part 220 Intersection information storage part 230 Signal information reception part 240 Signal information analysis part 250 Channel setting part 260 Wireless transmission judgment part 270 Wireless transmission Part

Hereinafter, embodiments of a base station device, an in-vehicle device, a wireless communication system, an information transmission method, and an information reception method according to the present invention will be described in detail with reference to the drawings. In the present embodiment, a case will be described in which the present invention is applied to a wireless communication system and a base station apparatus that perform narrow-area communication by the DSRC method at an intersection, but the present invention is not limited to the embodiment.

FIG. 1 is a diagram illustrating an example of the overall configuration of the wireless communication system according to the first embodiment. As shown in the figure, the wireless communication system includes traffic lights 100-1 to 100-4, intersection information collection device 110, signal information collection device 120, optical beacons 130-1 to 4, and wireless base station device 140-1. 4 and in-vehicle devices 150-1 to 150-4.

The traffic lights 100-1 to 100-4 are traffic lights arranged at intersections, and are a kind of roadside devices on the road side. The traffic lights 100-1 to 4 output the signal states of “blue” and “yellow” indicating permission of entry to the intersection of the vehicle and “red” indicating permission of entry to the signal information collecting device 120 in real time. In this embodiment, in order to make the intersection a crossroad, traffic lights are arranged at four places of the intersection. In general, the “yellow” signal state displayed on the traffic light is a warning for entering the vehicle into the intersection, but in this embodiment, it is included in the entry permission.

The intersection information collection device 110 collects traffic congestion information in the vicinity of the intersection of the road connected to the intersection using a sensor such as a camera, for example, in order to ensure vehicle safety.

The signal information collection device 120 acquires the signal states output from the traffic signals 100-1 to 100-4 and outputs the signal states to the radio base station devices 140-1 to 140-4. At this time, the signal information collecting apparatus 120 outputs, for example, a pair of a number uniquely representing each of the traffic signals 100-1 to 100 and a signal state.

The light beacons 130-1 to 4 are installed in each road lane and are a kind of roadside device on the road side. The optical beacons 130-1 to 4 transmit the number corresponding to the channel for modulating the road safety information transmitted by the radio base station apparatuses 140-1 to 140 and the receivable service number among the road safety information. The optical beacons 130-1 to 130-4 may be replaced with DSRC radio wave beacons.

The radio base station devices 140-1 to 140-4 are a kind of roadside device located at the corner where the road and the road connected to the intersection intersect each other. The radio base station devices 140-1 to 140-4 transmit road safety information of roads in the traveling direction of vehicles entering the intersection to a transmission area including the vicinity of the intersection between the intersection and the road. Specifically, radio base station apparatus 140-1 receives the signal state output by signal information collection apparatus 120. Radio base station apparatus 140-1 receives the road safety information of the road in the traveling direction of the vehicle output by intersection information collecting apparatus 110. Then, when the signal state of the road in the transmission area indicates “blue”, the radio base station apparatus 140-1 includes the road safety information on the road in the transmission area including the intersection between the intersection and the road. Send. Note that the radio base station apparatuses 140-2 to 140-4 perform the same processing as the radio base station apparatus 140-1, and thus the description thereof is omitted.

The in-vehicle devices 150-1 to 150-4 are mounted on the vehicle and receive road safety information of roads located in the traveling direction of the vehicle transmitted from the radio base station devices 140-1 to 140-4. Specifically, the in-vehicle device 150-1 modulates road safety information transmitted from the optical beacon 130-1 installed on the road by the radio base station device 140-1 while traveling on the road connected to the intersection. Of the number corresponding to the channel and the road safety information, the service number to be received by the channel is received. The in-vehicle device 150-1 can enter the intersection and receive from the road safety information transmitted by the radio base station device 140-1 when the signal state of the running road indicates “blue”. The service information corresponding to the correct service number is received using a receivable channel. Thus, a vehicle equipped with the in-vehicle device 150-1 can know road safety information of a road in the traveling direction of the vehicle when turning right at an intersection, for example. Note that the in-vehicle devices 150-2 to 150-4 perform the same processing as the in-vehicle device 150-1, and thus the description thereof is omitted.

Next, FIG. 2 is a functional block diagram illustrating the configuration of the radio base station apparatus according to the first embodiment. As shown in the figure, radio base station apparatus 140 is connected to intersection information collection apparatus 110 and signal information collection apparatus 120. The radio base station apparatus 140 includes an intersection information reception unit 210, an intersection information storage unit 220, a signal information reception unit 230, a signal information analysis unit 240, a channel setting unit 250, a radio transmission determination unit 260, And a wireless transmission unit 270.

The intersection information receiving unit 210 receives road safety information of roads connected to intersections in the traveling direction of the vehicle from the intersection information collecting device 110 in real time. For example, the intersection information receiving unit 210 receives traffic congestion information on a road in the traveling direction of a vehicle that has turned right or left at the intersection. However, hereinafter, the intersection information receiving unit 210 will be described as receiving traffic congestion information on the road in the traveling direction of the vehicle that has turned right at the intersection.

The intersection information storage unit 220 stores road safety information of the road received by the intersection information reception unit 210.

The signal information receiving unit 230 receives the signal states of the traffic lights 100-1 to 100-4 from the signal information collecting device 120 in real time. Specifically, the signal information receiving unit 230 receives a pair of a number uniquely representing each of the traffic signals 100-1 to 100 and a signal state.

The signal information analysis unit 240 analyzes the signal state of the road in the transmission area. Specifically, the signal information analysis unit 240 indicates “blue” and “yellow” indicating that the vehicle is permitted to enter, and “not permitted to enter” when the signal state of the traffic signal located on the road managed by the radio base station apparatus 140 is controlled. Analyze whether it is either “red”.

The channel setting unit 250 sets a channel used when the radio base station apparatus 140 transmits information. Specifically, when the channel setting unit 250 transmits information to the transmission area of the own radio base station apparatus 140, the channel that does not overlap the channel used by other radio base station apparatuses in the same time zone as the transmission frequency of the information Set to.

The wireless transmission determination unit 260 determines whether the signal information analyzed by the signal information analysis unit 240 is “blue” or “yellow” indicating entry permission.

When the signal information is “blue” or “yellow” indicating entry permission by the wireless transmission determining unit 260, the wireless transmission unit 270 stores the road stored in the transmission area of the wireless base station device 140 by the intersection information storage unit 220. A radio signal obtained by modulating the road safety information into the channel set by the channel setting unit 250 is transmitted. Then, when the vehicle-mounted device 150 mounted on the vehicle enters the area transmitted by the radio base station device 140, the vehicle-mounted device 150 receives the transmitted road safety information of the road. As a result, the radio base station device 140 transmits road safety information on the road through a channel that does not overlap with a channel used by another radio base station device. Therefore, when the in-vehicle device 150 enters the intersection, the radio signal interferes. Not normal road safety information can be received. Here, the wireless transmission unit 270 transmits the road safety information when the signal information indicates entry permission, but the road safety information may be always transmitted. In this case, the in-vehicle device 150 receives the signal information of the traffic lights 100-1 to 100-4, determines whether or not the signal information indicates entry permission, and provides road safety information only when indicating entry permission. Just receive it.

Next, FIG. 3 is a functional block diagram illustrating the configuration of the in-vehicle device according to the first embodiment. As shown in the figure, the in-vehicle device 150 includes a prior information receiving unit 310, a channel setting unit 320, an intersection information receiving unit 330, an intersection information extracting unit 340, and an intersection information output unit 350. Is done. It is assumed that the in-vehicle device 150 is mounted on a vehicle.

The prior information receiving unit 310 includes a number corresponding to a channel for modulating road safety information transmitted by the radio base station apparatuses 140-1 to 140-4 from the optical beacons 130-1 to 4 installed on the road and road safety information. The service number that can be received is received. The prior information receiving unit 310 receives information from the optical beacons 130-1 to 4 corresponding to the road on which the host vehicle is traveling.

The channel setting unit 320 sets the reception frequency to a channel corresponding to the channel number received by the prior information receiving unit 310.

The intersection information receiving unit 330 receives road safety information of roads from the radio base station devices 140-1 to 140-4. Intersection information receiving section 330 receives information from radio base station apparatuses 140-1 to 140-4 whose transmission area is the area in which the host vehicle is traveling.

The intersection information extraction unit 340 extracts the service information corresponding to the receivable service number from the road safety information of the road received by the intersection information reception unit 330. The intersection information extraction unit 340 extracts, for example, traffic congestion information on a road in the traveling direction when the intersection is turned to the right.

The intersection information output unit 350 outputs the service information extracted by the intersection information extraction unit 340 to, for example, a monitor connected to the in-vehicle device 150.

Next, the processing procedure of the radio base station apparatus 140 according to the first embodiment will be described with reference to FIG. FIG. 4 is a flowchart illustrating a process outline of the radio base station apparatus 140 according to the first embodiment.

First, the intersection information collection device 110 transmits information on roads that are located in the traveling direction of the vehicle traveling in the transmission area of the radio base station device 140 and connected to the intersection to the radio base station device 140. In addition, the signal information collection device 120 transmits the signal states output from the traffic lights 100-1 to 100-4 to the radio base station device 140.

Next, information on the intersection, for example, information on a road located in the traveling direction of the vehicle traveling in the transmission area of the radio base station apparatus 140 and connected to the intersection is received by the intersection information receiving unit 210 (S110). .

Then, the intersection information received by the intersection information receiving unit 210 is stored in the storage medium by the intersection information storage unit 220 (S120). The storage medium may be, for example, a RAM (Randam Access Memory) or a magnetic disk device, and may be another storage medium.

Next, the signal state of each of the traffic lights 100-1 to 100-4 is received by the signal information receiving unit 230 (S130). Specifically, the signal information receiving unit 230 receives a pair of a number uniquely representing each of the traffic signals 100-1 to 100 and a signal state.

Then, the signal state of the road in the transmission area is analyzed by the signal information analysis unit 240 (S140). Specifically, the signal information analysis unit 240 indicates that the signal state of the traffic light located on the road in the transmission area is “blue” or “yellow” indicating that the vehicle is permitted to enter, or “red” indicating that the entry is not permitted. Is analyzed.

When the signal state analyzed by the signal information analysis unit 240 is “blue” or “yellow” indicating entry permission, the channel setting unit 250 sets the transmission frequency to the other radio base station apparatus in the same time zone. A channel that does not overlap with the channel to be used is set (S150).

Next, the wireless transmission determining unit 260 determines whether communication with the vehicle has been established (S160).

Then, when communication is not established (S160: No), the process is terminated because transmission is impossible.

On the other hand, when the communication is established (S160: Yes), the wireless transmission determining unit 260 determines whether the signal state analyzed by the signal information analyzing unit 240 is other than “red” indicating that entry is not permitted. It is determined (S170).

As a result of the determination by the wireless transmission determination unit 260, when the signal state analyzed by the signal information analysis unit 240 is other than “red” indicating that entry is not permitted (S170: Yes), the transmission direction is determined by the wireless transmission unit 270. It is determined (S180). Specifically, radio transmission section 270 determines the transmission direction in the transmission area of own radio base station apparatus 140.

Then, the wireless transmission unit 270 transmits a wireless signal obtained by modulating the intersection information stored in the intersection information storage unit 220 into the channel set by the channel setting unit 250 in the determined transmission direction (S190). .

On the other hand, when the signal state analyzed by the signal information analysis unit 240 is “red” indicating that entry is not permitted (S170: No), the safety of the intersection can be confirmed visually from the stopped vehicle. The wireless signal is not transmitted, and the process ends.

Next, the processing procedure of the in-vehicle device 150 according to the first embodiment will be described with reference to FIG. FIG. 5 is a flowchart illustrating a processing outline of the in-vehicle device 150 according to the first embodiment. It is assumed that a vehicle equipped with the in-vehicle device 150 enters an intersection connecting to the road from the road.

First, the prior information receiving unit 310 receives the reception channel number and the receivable service number transmitted from, for example, the optical beacon 130-1 installed on the road on which the vehicle is traveling (S210). Specifically, prior information receiving section 310 receives a service number that can be received among the number corresponding to the channel for modulating the information on the intersection transmitted by radio base station apparatuses 140-1 to 140-4 and the information on the intersection. .

Next, the channel setting unit 320 sets the reception frequency to a channel corresponding to the channel number received by the prior information receiving unit 310 (S220).

Then, when the vehicle enters the transmission area of the radio base station device 140, the intersection information reception unit 330 receives the information on the intersection transmitted from the radio base station device 140 (S230).

Then, from the intersection information received by the intersection information receiving unit 330, service information corresponding to the service number received by the prior information receiving unit 310 is extracted by the intersection information extracting unit 340 (S240).

Then, the service information extracted by the intersection information extraction unit 340 is output by the intersection information output unit 350 to, for example, a monitor connected to the in-vehicle device 150 (S250).

Next, processing for transmitting road safety information from the radio base station apparatus according to the first embodiment to the vehicle will be described with reference to FIG. FIG. 6 is a diagram illustrating transmission of information from the radio base station apparatus according to the first embodiment to the vehicle. As shown in FIG. 6, radio base station apparatuses (A ′, B ′, C ′, D ′) are arranged at the corners where roads intersect, and each radio base station apparatus transmits information with directivity. Send.

Each radio base station device (A ′, B ′, C ′, D ′) can transmit each radio signal when the signal state of the road in the transmission area including the vicinity of the intersection between the intersection and the road is “blue”. Radio signals obtained by modulating road information in contact with base station apparatuses (A ′, B ′, C ′, D ′) into different channels are transmitted. For example, the radio base station apparatus A ′ modulates the information α around the intersection into the channel chA when the signal state of the road is “blue” for the vehicle A permitted to enter the intersection from the road across the intersection. Transmit the radio signal. Also, the radio base station apparatus B ′ modulates the information β around the intersection into the channel chB when the signal state of the road is “blue” for the vehicle B permitted to enter the intersection from the road across the intersection. Transmit the radio signal.

On the other hand, the radio base station apparatus A ′ and the radio base station apparatus B ′ do not transmit information around the intersection because the signal state of the road in each transmission area is “red”. At this time, the radio base station apparatus C ′ and the radio base station apparatus D ′ whose transmission area is a road whose signal state is “blue” are radio channels that are different from each other and are not transmitted in the same time zone. Radio signals obtained by modulating information δ and γ around the respective intersections are transmitted to the same channels chA and chB as the device A ′ and the radio base station device B ′.

As a result, the radio base station apparatus A ′ and the radio base station apparatus B ′ or the radio base station apparatus C ′ and the radio base station apparatus D ′ that use roads whose signal state is “blue” at the same time as transmission areas are different channels. Therefore, the wireless signals to be transmitted do not interfere, and the receiving vehicle (A, B) or the vehicle (C, D) can receive normal information. In addition, since radio base station apparatus A ′ and radio base station apparatus B ′ and radio base station apparatus C ′ and radio base station apparatus D ′ do not transmit information at the same time, overlapping channels chA and chB can be used. The number of channels used at the intersection can be reduced.

As described above, according to the first embodiment, the radio base station apparatus 140 receives entry permission / rejection information indicating whether a vehicle located on a road is permitted to enter an intersection connected to the road. Determining whether the received entry permission information indicates permission to enter the intersection of the vehicle, and when the determined entry permission information indicates permission to enter the intersection of the vehicle, the vehicle Road safety information of a road located in the traveling direction of the vehicle is transmitted in the direction of the road permitted to enter.

In this way, the radio base station apparatus 140 is positioned in the direction of travel of the vehicle in the direction of the road where the vehicle is permitted to enter the intersection when the entry permission / inhibition information indicates permission to enter the intersection of the vehicle. By transmitting road information, it is assumed that no information is transmitted when it indicates that entry is not permitted. In the meantime, the same channel as that of the own radio base station apparatus 140 can be allocated to another radio base station apparatus. Therefore, the number of channels used at the intersection can be reduced.

Next, the overall configuration of the wireless communication system according to the second embodiment will be described with reference to FIG. FIG. 7 is a diagram illustrating an example of the overall configuration of the wireless communication system according to the second embodiment. As shown in the figure, in the wireless communication system according to the second embodiment, two wireless base station devices are deleted from the wireless communication system according to the first embodiment (FIG. 1). Functions other than the radio base station devices 400-1 and 400-2 in FIG. 7 are the same as those in FIG.

Radio base station apparatuses 400-1 and 400-2 are arranged at two corners on the diagonal line between the roads connected to the intersection and the roads. Radio base station apparatuses 400-1 and 400-2 are intended for transmission areas including the vicinity of an intersection between roads that intersect the intersection and roads that intersect the road and that are in contact with the radio base station apparatuses 400-1 and 400-2. The road safety information of the road in the traveling direction of the vehicle entering the intersection is transmitted to the transmission area. Specifically, radio base station apparatus 400-1 receives the signal state output by signal information collection apparatus 120. Radio base station apparatus 400-1 receives the road safety information of the road in the traveling direction of the vehicle output by intersection information collecting apparatus 110. Then, when the signal state of any one of the roads in the two transmission areas indicates “blue” or “yellow”, the radio base station apparatus 400-1 displays the intersection and the transmission area including the vicinity of the intersection of the road. , Send road safety information of the road. Note that the radio base station apparatus 400-2 also performs the same processing as the radio base station apparatus 400-1, and a description thereof will be omitted.

In addition, the configuration of the radio base station apparatuses 400-1 and 400-2 is the same as that of the first embodiment, and is omitted. However, the signal information analysis unit 240, the radio transmission determination unit 260, and the radio transmission unit 270 are configured such that the own radio base station device 400 intersects with the transmission area including the vicinity of the intersection between the intersection and the own radio base station 400 It is assumed that processing is performed for the signal states of two roads in the transmission area for the road in contact with the station device 400.

Next, processing for transmitting road safety information from the radio base station apparatus according to the second embodiment to the vehicle will be described with reference to FIG. FIG. 8 is a diagram illustrating transmission of information from the radio base station apparatus according to the second embodiment to a vehicle. As shown in FIG. 8, radio base station devices (A ′, B ′) are arranged diagonally among the corners where the roads intersect, and each radio base station device transmits information with directivity. .

Each radio base station apparatus (A ′, B ′) is connected to each radio base station apparatus (A ′) when the signal state of the road in the transmission area including the vicinity of the intersection between the intersection and the road is “blue”. , B ′), a radio signal obtained by modulating the information on the road in contact with different channels is transmitted. For example, when the radio base station apparatus A ′ has a signal state of “blue” for the vehicle A that is permitted to enter the intersection from the road on the opposite side of the radio base station apparatus A ′ across the intersection. Then, a radio signal obtained by modulating the information α around the intersection with the channel chA is transmitted. Also, the radio base station apparatus B ′ becomes “blue” simultaneously with the signal state of the road that is the transmission area of the radio base station apparatus A ′, and at that time, on the opposite side of the own radio base station apparatus B ′ across the intersection A radio signal obtained by modulating the information β around the intersection into the channel chB is transmitted to the vehicle B permitted to enter the intersection from the road.

On the other hand, the radio base station apparatus A ′ and the radio base station apparatus B ′ do not transmit information around the intersection when the signal state of the road in each transmission area is “red”.

And each radio base station apparatus (A ', B'), when the signal state of the road is "blue" in the transmission area including the vicinity of the intersection between the intersection and the road, each radio base station apparatus A radio signal obtained by modulating the road information adjacent to (A ′, B ′) into different channels is transmitted. At this time, each radio base station apparatus (A ′, B ′) uses a channel that overlaps with the channels chA and chB used for transmission in the transmission area near the intersection of the road across the intersection.

As a result, the radio base station apparatus A ′ and the radio base station apparatus B ′ that use a road whose signal state is “blue” at the same time use different channels, so that radio signals to be transmitted do not interfere with each other. The receiving vehicles (A, B, C, D) can receive normal information. In addition, since the radio base station apparatus A ′ and the radio base station apparatus B ′ use transmission channels for transmission to two intersecting roads using different channels, the number of channels used at the intersection can be reduced. .

Next, the processing procedure of the radio base station apparatus 400 according to the second embodiment will be described with reference to FIG. FIG. 9 is a flowchart illustrating an outline of processing performed by the radio base station apparatus 400 according to the second embodiment. In FIG. 9, the same parts as those in FIG.

First, the intersection information collection device 110 transmits information on roads that are located in the traveling direction of the vehicle traveling in the transmission area of the radio base station device 140 and connected to the intersection to the radio base station device 140. Further, the signal information collecting apparatus 120 transmits the signal state output from each of the traffic signals 100-1 to 100-4 to the radio base station apparatus 400-1.

Next, the intersection information receiving unit 210 receives information on the intersection, for example, information on a road located in the traveling direction of the vehicle traveling in the transmission area of the radio base station apparatus 400-1 and connected to the intersection ( S110).

Then, the intersection information received by the intersection information receiving unit 210 is stored in the storage medium by the intersection information storage unit 220 (S120).

Next, the signal state of each of the traffic lights 100-1 to 100-4 is received by the signal information receiving unit 230 (S130).

Then, the signal information analysis unit 240 analyzes the signal states of the two roads that are transmission areas (S140). Specifically, the signal information analysis unit 240 indicates that the signal state of a traffic light located on two roads that are transmission areas is “blue” or “yellow” indicating permission of entry of the vehicle, or indicates that entry is not permitted. Analyze whether it is “red”.

When the signal state analyzed by the signal information analysis unit 240 is “blue” or “yellow” indicating entry permission, the channel setting unit 250 sets the transmission frequency to the other radio base station apparatus in the same time zone. A channel that does not overlap with the channel to be used is set (S150).

Next, the wireless transmission determining unit 260 determines whether communication with the vehicle has been established (S320).

And when communication is not established (S320: No), since the transmission is impossible, the process is terminated.

On the other hand, when communication is established (S320: Yes), it is determined whether one of the two signal states analyzed by the signal information analysis unit 240 is other than “red” indicating that entry is not permitted. It is determined by the transmission determining unit 260 (S330).

As a result of the determination by the wireless transmission determination unit 260, when the signal state of the road in one of the two transmission areas analyzed by the signal information analysis unit 240 is other than “red” indicating that entry is not permitted (S330). : Yes), the transmission direction is determined by the wireless transmission unit 270 (S340). Specifically, the wireless transmission unit 270 determines a transmission direction for a transmission region where the road signal state is other than “red”.

Then, the wireless transmission unit 270 transmits a wireless signal obtained by modulating the intersection information stored in the intersection information storage unit 220 into the channel set by the channel setting unit 250 in the determined transmission direction (S350).

On the other hand, when the signal states of the roads in the two transmission areas analyzed by the signal information analysis unit 240 are both “red” indicating no entry permission (S330: No), it is visually observed from the stopped vehicle. Since it is possible to confirm the safety of the intersection, no radio signal is transmitted, and the process ends.

As described above, according to the second embodiment, the radio base station devices 400-1 and 400-2 display the entry permission / inhibition information indicating permission to enter the intersection from a plurality of roads connected to the intersection and the entry non-permission. Vehicles that simultaneously receive entry permission / inhibition information, determine whether each of the received entry permission / inhibition information indicates permission to enter the vehicle intersection, and the entry permission / inhibition information indicates vehicle permission to enter the intersection The road safety information of the road in the traveling direction of the vehicle is transmitted.

In this way, the radio base station apparatuses 400-1 and 400-2 receive the entry permission / prohibition information permitted to enter the intersection and the entry permission / prohibition information not permitted to enter the intersection during the same time period, In order to transmit road safety information to a vehicle for which entry permission is indicated, one radio base station apparatus can control two transmission areas, and two radio base station apparatuses can be provided at one intersection.

Next, the overall configuration of the wireless communication system according to the third embodiment will be described with reference to FIG. FIG. 10 is a diagram illustrating an example of the overall configuration of the wireless communication system according to the third embodiment. As shown in the figure, in the wireless communication system according to the third embodiment, two wireless base station devices are deleted from the wireless communication system according to the first embodiment (FIG. 1). Functions other than the radio base station apparatuses 500-1 and 500-2 in FIG. 10 are the same as those in FIG.

The radio base station apparatuses 500-1 and 500-2 are arranged at two corners on the diagonal line among the corners where the road and the road connected to the intersection intersect. Also, radio base station apparatuses 500-1 and 500-2 are intended for transmission areas including the vicinity of an intersection between roads that intersect the intersection and roads that intersect the road and that are in contact with the radio base station apparatuses 500-1 and 500-2. Road safety information on the road is simultaneously transmitted to the transmission area. Specifically, radio base station apparatus 500-1 receives the signal state output by signal information collection apparatus 120. Then, the radio base station device 500-1 receives the road safety information of the road in the traveling direction of the vehicle output by the intersection information collecting device 110. Radio base station apparatus 500-1 is in a transmission area including the vicinity of an intersection between roads across the intersection and a transmission area for a road that intersects with the road and touches own radio base station apparatus 500-1. The detailed information of the road safety information of the road in the traveling direction of the vehicle is transmitted to the vehicle in which the signal state of any one of the roads is permitted to enter. At this time, radio base station apparatus 500-1 transmits the summary information of the road safety information of the road in the traveling direction of the vehicle to the vehicle whose other signal state is not permitted to enter. Here, the detailed information of the road safety information may be, for example, road safety information including an image of a traffic jam situation in the right turn direction or the left turn direction of the vehicle. Further, the summary information of the road safety information may be, for example, text indicating a traffic jam situation in the right turn direction or the left turn direction of the vehicle.

Next, the configuration of the radio base station apparatus according to the third embodiment will be described with reference to FIG. FIG. 11 is a block diagram of a radio base station apparatus according to the third embodiment. As shown in the figure, in the radio base station apparatus 500 according to the third embodiment, a transmission data generation unit 510 is added to the radio base station apparatus 140 according to the first embodiment. In the transmission data generation unit 510 of FIG. 11, the same parts as those of FIG. However, the signal information analysis unit 240, the radio transmission determination unit 260, and the radio transmission unit 270 perform transmission for a transmission area near the intersection of the road across the intersection and a road that intersects the road and touches the own radio base station apparatus. It is assumed that processing is performed on signal states of two roads in the area.

The transmission data generation unit 510 generates detailed information on road safety information of roads in the traveling direction of the vehicle traveling on the road permitted to enter among the signal states of the roads in the two transmission areas. At this time, the transmission data generation unit 510 generates summary information of road safety information of a road in the traveling direction of the stopped vehicle whose other signal state is not permitted to enter.

Next, a process for transmitting road safety information of a road from the radio base station apparatus according to the third embodiment to a vehicle will be described with reference to FIG. FIG. 12 is a diagram illustrating transmission of information from the radio base station apparatus according to the third embodiment to the vehicle. As shown in FIG. 12, radio base station apparatuses (A ′, B ′) are arranged on the diagonal line among the corners where the road and the road intersect, and each radio base station apparatus (A ′, B ′) has directivity. Send information with.

When each radio base station apparatus (A ′, B ′) has a signal state of “blue” in the transmission area including the vicinity of the intersection of the road across the intersection, each radio base station apparatus (A ′, B ′) ′) Is transmitted to the traveling vehicle (A, B), the detailed information of the road safety information on the road in contact with the road (′), to a different channel (chA, chB). At this time, the signal state of the road intersecting the road across the intersection is “red”, and each radio base station apparatus (A ′, B ′) is each radio base station apparatus (A ′, B ′). A radio signal obtained by modulating the summary information of the road safety information of the road in contact with the vehicle to the stopped vehicles (C, D) into different channels is transmitted.

And each radio base station apparatus (A ', B'), when the signal state of the road in the transmission area including the vicinity of the intersection of the road across the intersection is "red", each radio base station apparatus (A ' , B ′), the radio information obtained by modulating the summary information of the road safety information of the road in contact with the stopped vehicle (A, B) to different channels (chA, chB) is transmitted. At this time, the signal state of the road intersecting with the road across the intersection is “blue”, and each radio base station apparatus (A ′, B ′) is each radio base station apparatus (A ′, B ′). A radio signal obtained by modulating the detailed information of the road safety information of the road in contact with the vehicle to the stopped vehicles (C, D) in different channels is transmitted.

As a result, the radio base station apparatus A ′ or the radio base station apparatus B ′ receives information even if it transmits information using the same channel in different directions where the signal states are “blue” and “red” at the same time. The vehicle can receive normal information. In addition, although each radio base station apparatus (A ', B') is transmitting information using the same channel with respect to the different direction from which a signal state is "blue" and "red" simultaneously, for example, signal simultaneously When the directions in which the states are “blue” and “red” are close, the frequency band may be changed.

Next, the processing procedure of the radio base station apparatus 500 according to the third embodiment will be described with reference to FIG. FIG. 13 is a flowchart illustrating an outline of processing performed by the radio base station apparatus 500 according to the third embodiment. In FIG. 13, the same parts as those in FIG. 4 or FIG.

First, the intersection information collection device 110 transmits information about a plurality of roads that are located in the traveling direction of a vehicle traveling in an area controlled by the radio base station device 500 and connected to the intersection to the radio base station device 500. In addition, the signal information collection device 120 transmits the signal states output from the traffic lights 100-1 to 100-4 to the radio base station device 500.

Next, the intersection information receiving unit 210 receives information on the intersection, for example, information on a plurality of roads located in the traveling direction of the vehicle traveling in the transmission area of the radio base station device 500 and connected to the intersection ( S110).

Then, the intersection information received by the intersection information receiving unit 210 is stored in the storage medium (S120).

Next, the signal state of each of the traffic lights 100-1 to 100-4 is received from the signal information collecting device 120 by the signal information receiving unit 230 (S130).

Then, the signal state of the two roads that are transmission areas is analyzed by the signal information analysis unit 240 (S140). Specifically, the signal information analysis unit 240 indicates that the signal state of a traffic light located on two roads that are transmission areas is “blue” or “yellow” indicating permission of entry of the vehicle, or indicates that entry is not permitted. Analyze whether it is “red”.

And the channel setting part 250 sets a transmission frequency to the channel which does not overlap with the channel which another radio base station apparatus uses in the same time slot | zone (S150).

After the transmission frequency is set by the channel setting unit 250, the transmission data generation unit 510 advances the vehicle in which one signal state analyzed by the signal information analysis unit 240 is “blue” or “yellow” indicating entry permission. Generate detailed information on road intersections in the direction. At this time, the transmission data generation unit 510 generates summary information of the intersection of the road in the traveling direction of the vehicle in which the other signal state analyzed by the signal information analysis unit 240 is “red” indicating that entry is not permitted. (S410).

Next, the wireless transmission determination unit 260 determines whether communication with the vehicle has been established (S420).

And when communication is not established (S420: No), since transmission is impossible, a process is complete | finished.

On the other hand, when communication is established (S420: Yes), the wireless transmission unit 270 determines the transmission direction in the direction in which the signal state analyzed by the signal information analysis unit 240 is permitted to enter. At this time, the wireless transmission unit 270 further determines the transmission direction in the direction in which the signal state analyzed by the signal information analysis unit 240 is not permitted to enter (S430).

Then, wireless transmission section 270 transmits a wireless signal obtained by modulating the detailed information of the intersection generated by transmission data generation section 510 to the channel set by channel setting section 250 in the direction in which the signal state is permitted to enter. To do. At this time, the wireless transmission unit 270 modulates the summary information of the intersection generated by the transmission data generation unit 510 into the channel set by the channel setting unit 250 in the direction in which the signal state is not permitted to enter. Is transmitted (S440).

As described above, according to the third embodiment, the radio base station apparatus 500 displays the entry permission / rejection information indicating permission to enter the intersection from the plurality of roads connected to the intersection and the entry permission / rejection information indicating entry prohibition. At the same time, it is determined whether or not each of the received information indicating whether or not the vehicle has entered the vehicle is permitted to enter the intersection. Then, the radio base station device 500 generates detailed information of road safety information of the road in the traveling direction of the vehicle in which the determined entry permission / prohibition information is permitted to enter, and the determined entry permission / prohibition information is the entry not permitted. The summary information of the road safety information of the road in the traveling direction of the selected vehicle is generated. Then, the radio base station apparatus 500 transmits the detailed information of the generated road safety information to the vehicle permitted to enter the intersection, and the generated summary information of the road safety information is stopped from entering the intersection. Send to the vehicle.

In this way, the radio base station apparatus 500 receives the entry permission / inhibition information permitted to enter the intersection and the entry permission / inhibition information stopped to enter the intersection at the same time zone, and simultaneously roads both vehicles. Since safety information is transmitted, road safety information can be transmitted efficiently.

Next, the overall configuration of the wireless communication system according to the fourth embodiment will be described with reference to FIG. FIG. 14 is a diagram illustrating an example of the overall configuration of the wireless communication system according to the fourth embodiment. As shown in the figure, the wireless communication system according to the fourth embodiment is different from the wireless communication system according to the first embodiment (FIG. 1) in traffic lights 100-1 to 100-4, an intersection information collecting device 110, and a signal information collecting device 120. Three radio base station apparatuses are deleted, and a signal information / intersection information collecting apparatus 600 is newly added. Functions other than the signal information / intersection information collection device 600 and the radio base station device 610 in FIG. 14 are the same as those in FIG. The fourth embodiment may be used when the traffic lights 100-1 to 100-4 do not have a function of outputting the signal state to the signal information collecting device 120.

The signal information / intersection information collection device 600 collects the signal state represented by the traffic lights arranged at the intersection and the road safety information for each road connected to the intersection using an all-around camera installed in the center of the intersection. Then, the signal information / intersection information collection device 600 transmits the collected signal information and road safety information to the radio base station device 610. The all-around camera is a kind of roadside device on the road side.

The radio base station device 610 is arranged at a corner where a road and a road connected to the intersection intersect. Also, the radio base station apparatus 610 multicasts road safety information on roads to a transmission area including the intersections of all roads across the intersection. The road safety information is, for example, a bundle of service information set for each road connected to an intersection in the traveling direction of the vehicle, and a service number may be associated with each service information.

In addition, the configuration of the radio base station apparatus 610 is the same as that of the first embodiment, and is omitted. However, the signal information analysis unit 240, the wireless transmission determination unit 260, and the wireless transmission unit 270 perform processing for the signal states of all roads connected to the intersection.

Next, a process for transmitting road safety information of a road from the radio base station apparatus according to the fourth embodiment to a vehicle will be described with reference to FIG. FIG. 15 is a diagram illustrating transmission of information from the radio base station apparatus according to the fourth embodiment to a vehicle. As shown in FIG. 15, the radio base station apparatus A ′ is arranged at the corner where the road and the road intersect, and transmits information with directivity.

The radio base station apparatus A ′ receives from the signal information / intersection information collecting apparatus S the signal state represented by the traffic lights arranged at the intersection and the road safety information for each road connected to the intersection. Then, the radio base station apparatus A ′ multicast-transmits a radio signal obtained by modulating road safety information into the channel chA to a transmission area including the vicinity of the intersection of the road across the intersection. At this time, the vehicle (A, B, C, D) is a channel that modulates road safety information transmitted by the radio base station apparatus A ′ from optical beacons (OA, CB, OC, CD) previously installed on the road. A receivable service number is received from the number corresponding to chA and road safety information. Then, when the signal state of the running road indicates “blue”, the vehicle enters the intersection and receives a service corresponding to the service number that can be received from the road safety information transmitted by the radio base station apparatus A ′. Information is received using a channel chA capable of receiving information.

As a result, the radio base station apparatus A ′ can transmit information using the same channel in the direction in which the signal state is “blue” at the same time. And one radio base station apparatus can be provided at one intersection.

Further, a process for transmitting road safety information of a road from the radio base station apparatus according to the fourth embodiment to a vehicle will be described with reference to FIG. FIG. 16 is a diagram illustrating transmission of information from the radio base station apparatus according to the fourth embodiment to a vehicle. As shown in FIG. 16, the radio base station apparatus A ′ is arranged at a corner where the road and the road intersect, and transmits information with directivity.

The radio base station apparatus A ′ receives, for example, the signal state represented by the traffic light arranged at the intersection and the road safety information for each road connected to the intersection from the signal information / intersection information collection apparatus 600. Then, the radio base station apparatus A ′ multicast-transmits a radio signal obtained by modulating road safety information into the channel chA in a transmission area including the intersection and the vicinity of the road across the intersection. At this time, when the emergency vehicle travels toward the intersection, the radio base station device A ′ receives the emergency information indicating the traveling direction transmitted from the emergency vehicle, and transmits the received emergency information together with the road safety information. .

As a result, even if the radio base station apparatus A ′ uses only one channel for communication with the emergency vehicle and uses only one channel for communication of road safety information performed at the intersection, the band defined by the DSRC standard is used. Can be used efficiently. In addition, since the radio base station apparatus A ′ can transmit emergency information together with road safety information when an emergency vehicle travels toward an intersection, it can reduce traffic congestion and smooth traffic at the intersection. *

As described above, according to the fourth embodiment, the radio base station apparatus 610 receives the entry permission / rejection information represented by the traffic signal photographed by the camera installed at the intersection, and the received entry permission / rejection information is stored in the vehicle. It is determined whether or not the entry permission to the intersection is indicated, and when it is determined by the determination that the entry permission / inhibition information indicates the entry permission to the intersection of the vehicle, the vehicle is permitted to enter the intersection. Send road safety information for roads in the direction of travel.

In this way, since the radio base station apparatus 610 receives the information on whether or not all roads connected to the intersection are received and has jurisdiction over the transmission area in four directions, one radio base station apparatus is used at one intersection. Can do.

In each of the above embodiments, a traffic signal, an optical beacon, a wireless base station device, and a camera are given as examples of roadside devices. However, the present invention is not limited to this, and road signs are also a type of roadside device.

Each processing function performed in the radio base station apparatus is entirely or arbitrarily part of a microcomputer such as a CPU (Central Processing Unit) (or MPU (Micro Processing Unit), MCU (Micro Controller Unit), etc. ) And a program that is analyzed and executed by the CPU (or a microcomputer such as MPU or MCU), or may be realized as hardware by wired logic.

Claims (10)

1. A receiving unit that receives from the roadside device information indicating whether or not a vehicle located in an area on the road to be transmitted is permitted to enter an intersection between the road and another road;
   A determination unit that determines whether or not the entry permission information received by the reception unit indicates permission to enter a vehicle intersection;
   When the determination unit determines that the entry permission / inhibition information indicates permission to enter the intersection of the vehicle, the traveling direction of the vehicle to the vehicle-mounted device on the transmission target road permitted to enter the intersection A transmission unit for wirelessly transmitting road safety information of roads in
   A base station apparatus comprising:
2. The receiver is
   The base station apparatus according to claim 1, wherein the base station apparatus receives information indicating whether or not to enter the intersection from a roadside apparatus installed on each of a plurality of roads connected to the intersection in association with the roadside apparatus of each road. .
3. Road roads in the direction of travel of vehicles whose entry into the intersection is not permitted due to detailed information on road safety information on roads in the direction of travel of vehicles permitted to enter the intersection based on the information on whether or not entry is permitted A generation unit that generates safety information summary information is provided.
   The transmitter is
   The detailed information generated by the generation unit is wirelessly transmitted to an in-vehicle device of a vehicle on a road that is permitted to enter an intersection according to the entry availability information, and the summary information generated by the generation unit is entered. The base station apparatus according to claim 2, wherein the base station apparatus wirelessly transmits to an in-vehicle device of a vehicle on a road where entry to an intersection is not permitted by information.
4. The receiver is
   Receiving, from the roadside device, information on whether or not entry is permitted for each road indicating whether entry to the intersection is permitted from all roads connected to the intersection;
   The transmitter is
   The road safety information in the traveling direction of the vehicle is wirelessly transmitted to an in-vehicle device of the vehicle that is determined by the determination unit that the entry permission / inhibition information indicates entry permission to the intersection of the vehicle. The base station apparatus according to 1.
5. The receiver is
   The base station apparatus according to any one of claims 1 to 4, wherein the base station apparatus receives entry permission / prohibition information represented by a traffic signal installed at an intersection.
6. The road safety information is
   The base station apparatus according to claim 1, wherein the base station apparatus is information including a traffic jam situation in a right turn direction or a left turn direction of the vehicle.
7. A pre-information receiving unit that receives from the roadside device a service name that can be received from road safety information of a road in the traveling direction of the vehicle and a frequency that modulates the road safety information;
   A road information receiving unit that receives information corresponding to the service name from the road safety information transmitted from a base station device using the frequency received by the prior information receiving unit;
   An in-vehicle device comprising:
8. A wireless communication system having an in-vehicle device and a base station device mounted on a vehicle,
   The base station device
   A receiving unit that receives from the roadside device information indicating whether or not a vehicle located in an area on the road to be transmitted is permitted to enter an intersection between the road and another road;
   A determination unit that determines whether or not the entry permission information received by the reception unit indicates permission to enter a vehicle intersection;
   When the determination unit determines that the entry permission / inhibition information indicates permission to enter the intersection of the vehicle, the traveling direction of the vehicle to the vehicle-mounted device on the transmission target road permitted to enter the intersection A transmission unit for wirelessly transmitting road safety information of the road in
   The in-vehicle device is
   A pre-information receiving unit that receives from the roadside device a service name that can be received from the road safety information transmitted from the base station device and a frequency that modulates the road safety information;
   A road information receiving unit that receives information corresponding to the service name from the road safety information transmitted from the base station device using the frequency received by the prior information receiving unit;
   Road information output means for outputting the received information;
   A wireless communication system comprising:
9. A receiving step of receiving, from a roadside device, information indicating whether or not a vehicle located in an area on a road to be transmitted is permitted to enter an intersection between the road and another road;
   A determination step of determining whether or not the entry permission information received by the reception step indicates permission to enter a vehicle intersection; and
   When it is determined in the determination step that the entry permission / inhibition information indicates permission to enter the intersection of the vehicle, the traveling direction of the vehicle to the vehicle-mounted device on the transmission target road permitted to enter the intersection A transmission step of wirelessly transmitting road safety information of the road in
   An information transmission method comprising:
10. A prior information receiving step of receiving from the roadside device a service name that can be received from road safety information of a road in the traveling direction of the vehicle and a frequency for modulating the road safety information;
    Road information receiving step of receiving information corresponding to the service name from the road safety information transmitted from the base station device using the frequency received by the prior information receiving step;
    A road information output step for outputting the received information;
    An information receiving method comprising:

Images