JP2009128976A - Vehicle wireless communication system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a vehicle wireless communication system allowing an onboard device to perform road-vehicle communication and inter-vehicle communication under an optimum communication condition. <P>SOLUTION: The onboard device 9 constituting this vehicle wireless communication system has: a road-vehicle-communicating wireless device A11 for performing the road-vehicle communication with a roadside machine A1; a road-vehicle-communicating wireless device B13 for performing the road-vehicle communication with a roadside machine B5; an inter-vehicle-communicating wireless device 15 for performing the inter-vehicle communication with another vehicle; and an onboard controller 17 for controlling them. Information received by the road-vehicle-communicating wireless device B13 is judged by the onboard controller 17, and it is decided by a judgement result whether the road-vehicle-communicating wireless device A11 receives service information from the roadside machine A1 or whether the inter-vehicle-communicating wireless device 15 receives the service information from the other vehicle, so that service is received under the optimum communication condition. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a vehicle radio communication system for performing road-to-vehicle communication between a roadside machine installed on a road and a vehicle, and performing vehicle-to-vehicle communication between a vehicle and another vehicle.

VICS (Vehicle Information and Communication System) has been put to practical use as a device that provides traffic information such as traffic jam information to vehicles traveling on the road. VICS includes FM radio waves, radio wave beacons using 2.4 GHz radio waves, and optical beacons using infrared light as communication means. In recent years, it has been used not only for traffic information but also for the purpose of safety support that informs the driver of traffic information that occurs ahead of the curve that the driver cannot see directly. .
Also, practical application of safety support information provision system using communication means such as DSRC (Dedicated Short-Range Communications) using 5.8 GHz radio wave, which has been put into practical use by ETC (Electronic Toll Collection System), is under consideration. Has been.
As an example of an information providing system, signal information is received by road-to-vehicle communication, and the vehicle starts to support when it changes from red to blue (for example, Patent Document 1), or an oncoming straight vehicle approaches when turning right A device has been devised that sends an image to the driver to inform the driver (for example, Patent Document 2).

JP 2004-310280 A (4th to 10th pages, FIG. 1) JP-A-9-270097 (pages 3 to 4, FIG. 1)

In a conventional vehicle wireless communication system, for road-to-vehicle communication between a roadside device installed on a road and an on-vehicle device installed on the vehicle, or vehicle-to-vehicle communication with another vehicle, it is for road-to-vehicle communication of the own vehicle. The communication conditions between the in-vehicle device or in-vehicle device for inter-vehicle communication and the roadside device or other vehicle do not always match under the optimum conditions, and external factors such as congestion, fading and shadowing of the communication channel As a result, communication conditions deteriorate.
Therefore, it may take a long time to establish communication by trying communication reconnection multiple times, or communication may not be established eventually, and communication quality deteriorates and a good communication state is realized. There was a problem that could not be done.
As a result, there is a problem that information for the purpose of safety support may not be provided to the driver.

  The present invention has been made to solve the above-described problems, and an object of the present invention is to provide a vehicle wireless communication system in which an in-vehicle device can perform road-to-vehicle communication and vehicle-to-vehicle communication under optimum communication conditions. ing.

In the vehicle radio communication system according to the present invention, in the vehicle radio communication system configured to perform radio communication between the roadside machine and other vehicles by the vehicle-mounted device mounted on the host vehicle,
The vehicle-mounted device includes a plurality of road-to-vehicle wireless communication means for performing road-to-vehicle wireless communication with a plurality of roadside devices, a vehicle-to-vehicle wireless communication means for performing vehicle-to-vehicle wireless communication with other vehicles, and a plurality of roads. A control means for controlling the inter-vehicle wireless communication means and the inter-vehicle wireless communication means,
The control means determines the information from the first roadside machine received by the first roadside-to-vehicle wireless communication means, and based on the determination result, from the second roadside machine installed in front of the first roadside machine. And the information from other vehicles are received.

As described above, the present invention is a vehicle wireless communication system configured to perform wireless communication between a roadside device and another vehicle by an in-vehicle device mounted on the host vehicle.
The vehicle-mounted device includes a plurality of road-to-vehicle wireless communication means for performing road-to-vehicle wireless communication with a plurality of roadside devices, a vehicle-to-vehicle wireless communication means for performing vehicle-to-vehicle wireless communication with other vehicles, and a plurality of roads. A control means for controlling the inter-vehicle wireless communication means and the inter-vehicle wireless communication means,
The control means determines the information from the first roadside machine received by the first roadside-to-vehicle wireless communication means, and based on the determination result, from the second roadside machine installed in front of the first roadside machine. Any of the above information and information from other vehicles, the optimal condition for establishing communication necessary to obtain information from the second roadside machine can be set based on the information from the first roadside machine. Therefore, it is possible to avoid deterioration in communication quality.

Embodiment 1 FIG.
1 is a block diagram showing a configuration of a vehicle radio communication system according to Embodiment 1 of the present invention.
In FIG. 1, the vehicle wireless communication system is mounted on a roadside machine A1 (second roadside machine) and a roadside machine B5 (first roadside machine) provided on the road, and a vehicle traveling on the road, and the roadside machine A1. The vehicle-mounted device 9 transmits and receives data to and from the roadside device B5.
The roadside device A1 includes a roadside wireless communication device A3, a roadside device transmission / reception antenna A2, and a roadside control device A4. Similarly, the roadside device B5 includes a roadside wireless communication device B7, a roadside device transmission / reception antenna B6, and a roadside control device B8.
The roadside wireless communication device A3 communicates with the vehicle-mounted device 9 via the roadside machine transmission / reception antenna A2. The roadside control device A4 controls the operation of the roadside wireless communication device A3. Similarly, the roadside wireless communication device B7 communicates with the vehicle-mounted device 9 via the roadside machine transmission / reception antenna B6. The roadside control device B8 controls the operation of the roadside wireless communication device B7.

  The vehicle-mounted device 9 includes a road-to-vehicle communication wireless device A11 (second road-to-vehicle wireless communication means), a road-to-vehicle communication antenna A12, and a road-to-vehicle communication wireless device B13 (first road-to-vehicle wireless communication means). Road-to-vehicle communication antenna B14, vehicle-to-vehicle communication wireless device 15 (vehicle-to-vehicle wireless communication means), vehicle-to-vehicle communication antenna 16, vehicle-mounted control device 17 (control means), and HMI (Human Machine Interface) device. 18. Hereinafter, these will be described.

Road-to-vehicle communication antenna A12, road-to-vehicle communication antenna B14, and vehicle-to-vehicle communication antenna 16 are provided in road-to-vehicle communication wireless device A11, road-to-vehicle communication wireless device B13, and vehicle-to-vehicle communication wireless device 15, respectively. Yes.
The road-vehicle communication wireless device A11 performs road-vehicle communication with the roadside device A1 via the road-vehicle communication antenna A12. The road-vehicle communication wireless device B13 performs road-vehicle communication with the roadside device B5 via the road-vehicle communication antenna B14. The inter-vehicle communication wireless device 15 performs inter-vehicle communication with other vehicles via the inter-vehicle communication antenna 16.
The road-to-vehicle communication wireless device A11, the road-to-vehicle communication antenna A12, the road-to-vehicle communication wireless device B13, the road-to-vehicle communication antenna B14, the vehicle-to-vehicle communication wireless device 15, and the vehicle-to-vehicle communication antenna 16 are A wireless communication device 10 is configured.

The in-vehicle control device 17 is connected to the road-to-vehicle communication wireless device A11, the road-to-vehicle communication wireless device B13, and the vehicle-to-vehicle communication wireless device 15, and the road-to-vehicle communication wireless device A11, the road-to-vehicle communication wireless device B13, Also, it has a function of capturing data input to the inter-vehicle communication wireless device 15 and outputting the captured data to the HMI device 12.
The in-vehicle control device 17 has a function of transferring data taken from the road-to-vehicle communication wireless device A11, the road-to-vehicle communication wireless device B13, and the vehicle-to-vehicle communication wireless device 15 to another communication wireless device. .
The in-vehicle control device 17 is used for communication with a roadside device that outputs data to the HMI device 18 or transfers the data to an arbitrary communication wireless device based on data obtained from each communication wireless device. Switching between communication wireless devices, selecting the modulation method of the communication wireless device, switching or selecting the directivity of the transmission / reception antenna, etc., such as road-to-vehicle communication with the roadside unit of the vehicle-mounted device 9, and vehicle-to-vehicle communication with other vehicles It has functions for selecting, changing, switching, adjusting and judging communication characteristics.
Moreover, the vehicle-mounted control apparatus 17 has a memory, and can write and preserve | save various information, such as driver information and vehicle information input from the outside.

  The HMI device 18 has an image reproduction means for displaying an image and an audio output means for outputting sound. If the data output from the in-vehicle control device 17 is image data, the image is reproduced using the image reproduction means. If the information is provided to the driver of the vehicle and the data from the in-vehicle control device 17 is voice data, the information is provided to the driver by voice using voice output means.

  In addition, the carrier wave frequency of the data transmitted / received by road-to-vehicle communication and vehicle-to-vehicle communication is not particularly limited as long as it is within the frequency range permitted by the Radio Law. Further, the road-to-vehicle communication is not limited as long as it performs communication between the roadside device and the vehicle-mounted device, and the type of communication carrier wave such as radio waves and light is not limited.

In addition, the number of antennas provided in the road-to-vehicle communication antenna A12, the road-to-vehicle communication antenna B14, and the vehicle-to-vehicle communication antenna 16 is at least one, and the antenna shape and the installation position are arbitrary.
Also, the road-to-vehicle communication antenna A12, the road-to-vehicle communication antenna B14 and the vehicle-to-vehicle communication antenna 16, the roadside wireless communication device A3, the roadside wireless communication device B7, the roadside to vehicle communication wireless device A11, and the roadside to vehicle communication wireless device B13. The inter-vehicle communication wireless device 15 is designed according to the frequency of the carrier wave to be used.

FIG. 2 is an image diagram showing an example of a communication path of the vehicle radio communication system according to Embodiment 1 of the present invention. FIG. 2 (b) is a time transition from FIG. 2 (a). In the case where service is provided by road-to-vehicle communication with the roadside machine A, FIG. 2 (c) has time transition from FIG. 2 (a). In the figure, a case where a service is provided by inter-vehicle communication is shown.
In FIG. 2, four vehicles 20 a to 20 d are traveling in the traveling direction of each lane (the arrow direction in the figure) on a road 19 having two lanes on one side. The vehicles 20a to 20d are equipped with vehicle-mounted devices 9a to 9d having the same configuration as that shown in FIG. On the road 19, a roadside machine A1 and roadside machines B5a and 5b are installed. The roadside machine A1 performs road-to-vehicle communication with a vehicle that has entered the road-to-vehicle communication possible area 21 of the roadside machine A1 in its service providing area 25. The roadside machines B5a and 5b perform road-to-vehicle communication with vehicles that have entered the respective road-to-vehicle communication possible areas 22a and 22b. FIG. 2 also shows the directivity 23 of the road-to-vehicle communication transmitting / receiving antenna A of the road-to-vehicle communication wireless device A.

The operation according to the first embodiment of the present invention will be specifically described below with reference to FIGS.
A roadside machine A1 and roadside machines B5a and 5b are installed on the road 19 in FIG. The roadside device A1 performs road-to-vehicle communication with a vehicle that has entered the road-to-vehicle communication possible area 21 of the roadside device A1 within the service providing area 25, and provides arbitrary information such as traffic jam information and safety support information. .
The roadside machines B5a and 5b are installed in front of the roadside machine A1 and perform road-to-vehicle communication with vehicles that have entered the road-to-vehicle communication areas 22a and 22b of the roadside machines B5a and 5b. Provision of service, service type, communication conditions necessary to receive the service (for example, wireless communication means such as road-to-vehicle / vehicle-to-vehicle, directivity of transmission / reception antenna, reception sensitivity of in-vehicle wireless communication device, modulation method, etc.), service Information such as the distance to the provision area 25, the traveling lane of the vehicle, and the roadside machine ID is transmitted to the vehicle-mounted device 9.

Next, communication operation when the vehicle 20a is the receiving side will be described.
In FIG. 2A, the roadside control device B8 in the roadside machine B5a controls the roadside wireless communication device B7 to transmit data for distribution to the vehicle 20a, and the roadside wireless communication device B7 The data is transmitted as transmission data to the road-to-vehicle communicable area 22a through the machine transmission / reception antenna B6.
At this time, since the vehicle 20a exists in the road-to-vehicle communication possible area 22a of the roadside device B5a, the vehicle 20a performs reception processing of transmission data from the roadside device B5a. The road-to-vehicle communication radio device B13a of the vehicle 20a receives transmission data from the roadside device B5a as reception data via the road-to-vehicle communication antenna B14a. Here, since the vehicles 20b to 20d do not exist in the road-to-vehicle communicable region 22a of the roadside machine B5a, the roadside machine B5a cannot perform road-to-vehicle communication.

  Subsequently, the in-vehicle control device 17a takes in the reception data received by the road-to-vehicle communication wireless device B13a, and extracts information related to the information providing service in the service providing region 25 ahead of the vehicle from the received data. Here, a case will be described in which information on “wireless communication means such as road-to-vehicle / vehicle-to-vehicle communication” is extracted and determined.

In the service providing area 25, when the information “provide information through road-to-vehicle communication using the road-to-vehicle communication wireless device A11” is extracted, the in-vehicle control device 17a sends the information to the road-to-vehicle communication wireless device A11a. On the other hand, control is performed so that road-to-vehicle communication can be performed.
In FIG. 2B, which is time-shifted from the state of FIG. 2A, the roadside control device A4 in the roadside device A1 transmits data for distribution to the vehicle 20a to the roadside wireless communication device A3. Then, the roadside wireless communication device A3 transmits the data as transmission data to the road-to-vehicle communicable area 21 via the roadside machine transmission / reception antenna A2.
At this time, the vehicle 20a is in the road-to-vehicle communication possible area 21 of the roadside unit A1, and the in-vehicle wireless communication device 10 is capable of road-to-vehicle communication with the road-to-vehicle communication wireless device A11a mounted on the vehicle 20a. Is set, transmission data reception processing from the roadside device A1 is performed.
The road-to-vehicle communication wireless device A11a of the vehicle 20a receives transmission data from the roadside device A1 as reception data via the road-to-vehicle communication antenna A12a. Here, since the vehicles 20b to 20d do not exist in the road-to-vehicle communicable area 21 of the road-side machine A1, road-to-vehicle communication with the road-side machine A1 cannot be performed.
Here, it is necessary to determine on the vehicle 20a side that the vehicle 20a exists in the service providing area 25, but the determination method does not matter. For example, it may be determined that the roadside machine A1 is present in the road-to-vehicle communication area 21 and the road-to-vehicle communication is possible, or the road-to-vehicle communication with the roadside machine 5a indicates that “the roadside machine 5a is used as a base point. The “distance to the service providing area” may be received, the distance may be calculated from the vehicle speed of the host vehicle, and the like may be determined to exist in the service providing area 25.

The in-vehicle control device 17a takes in the reception data received by the road-vehicle communication wireless device A11a and outputs the reception data to the HMI device 18a. If the received data from the in-vehicle control device 17a is image data, the HMI device 18a provides information to the driver of the vehicle 20a by an image. If the received data is voice data, the HMI device 18a provides information to the driver by voice.
Here, the reception data received by the roadside-vehicle communication wireless device A11a from the roadside device A1 is unconditionally output to the HMI device 18a via the in-vehicle control device 17a, but the output condition to the HMI device 18a is as follows: Based on the information provision conditions obtained by the roadside machine B5a and the vehicle information of the vehicle 20a, the onboard control device 17a may determine whether or not the provision is possible. The conditions for providing information include, for example, determination of whether the driving lane, the vehicle speed, the turn signal, the accelerator opening / closing degree, the ID assigned to each roadside machine individually matches, or does not match.

Next, a case will be described in which the information “provide information by inter-vehicle communication with surrounding vehicles by the inter-vehicle communication wireless device 15” is extracted in the road-to-vehicle communication with the roadside device B5a.
When the vehicle 20a extracts this information, the in-vehicle control device 17a controls the inter-vehicle communication wireless device 15a so that inter-vehicle communication can be performed.
In FIG. 2 (c), which is time-shifted from the state of FIG. 2 (a), the vehicle 20a exists in the service providing area 25. Therefore, in the road-to-vehicle communication with the roadside device B5b, 15, “information is provided by vehicle-to-vehicle communication with surrounding vehicles at 15”, and the vehicle 20 b and the vehicle controlled so that the vehicle-to-vehicle communication can be performed by the vehicle-to-vehicle communication wireless device 15 b from the vehicle-mounted control device 17 b. Receive information through inter-vehicle communication.
Here, it is necessary to determine that the vehicle 20a and the vehicle 20b exist in the service providing area 25, but the presence is determined in the same manner as in the case of providing information through road-to-vehicle communication with the roadside machine A1 described above. It doesn't matter how.

The in-vehicle control device 17a takes in the reception data received by the inter-vehicle communication wireless device 15a and outputs the reception data to the HMI device 18a. If the received data from the in-vehicle control device 17a is image data, the HMI device 18a provides information to the driver of the vehicle 20a by an image. If the received data is voice data, the HMI device 18a provides information to the driver by voice.
Here, the reception data received by the inter-vehicle communication wireless device 15a from the vehicle 20b is unconditionally output to the HMI device 18a via the in-vehicle control device 17a, but the output condition to the HMI device 18a is the roadside Based on the information provision conditions obtained by the machine B5a and the vehicle information of the vehicle 20a, the in-vehicle control device 17a may determine whether or not the provision is possible. The conditions for providing information include, for example, whether the traveling lane, the vehicle speed, the turn signal, the accelerator opening / closing degree, the ID assigned to each roadside device, and the like match or mismatch.

  According to the first embodiment, as described above, the vehicle-mounted control device 17a of the vehicle-mounted device 9a receives the road-to-vehicle communication radio device B13a by road-to-vehicle communication from the roadside device B5a installed in front of the service providing area 25. The received data is extracted, and information on “wireless communication means such as road-to-vehicle / vehicle-to-vehicle” in the service providing area 25 in front of the vehicle is extracted from the received data, and the wireless communication means is selected based on the extracted information. Thus, since it is possible to set an optimum condition for establishing communication necessary for obtaining the service, it is possible to avoid deterioration in communication quality.

Embodiment 2. FIG.
In the first embodiment, the “road-to-vehicle / vehicle in the service provision area 25 in front of the vehicle extracted from the reception data received by the vehicle-mounted device 9a through road-to-vehicle communication from the roadside device B5a installed in front of the service provision area 25. The operation based on the information of “wireless communication means such as inter-vehicle” has been described. This type of information is, for example, the communication characteristics of the road-to-vehicle communication wireless device 11a and the vehicle-to-vehicle communication wireless device 15a in the vehicle-mounted device 9a. It may be “modulation method”, “reception sensitivity”, “directivity of transmission / reception antenna”, “frequency of carrier wave”, “transmission power”, etc. Degradation can be avoided.
In the second embodiment, an operation when “directivity of transmission / reception antenna” is selected and set as a communication characteristic will be described.

FIG. 3 is an image diagram showing an example of a communication path of the vehicle radio communication system according to the second embodiment of the present invention.
FIG. 3A is a diagram illustrating a change in directivity of a road-to-vehicle communication antenna, and FIG. 3B is a diagram illustrating a change in directivity of a vehicle-to-vehicle communication antenna.
In FIG. 3, 1, 5, 19-23 and 25 are the same as those in FIG. The directivity 24 of the vehicle-to-vehicle communication transceiver antenna of the vehicle-to-vehicle communication wireless device is shown.

FIG. 4 is an image diagram showing another example of the communication path of the vehicle radio communication system according to Embodiment 2 of the present invention.
In FIG. 4, FIG. 4 (a) is a diagram for explaining the change in directivity of the antenna for road-to-vehicle communication when two roadside units providing services are arranged in series, and FIG. 4 (b) is a service providing. It is a figure explaining the change of the directivity of the antenna for road-vehicle communication when the roadside machine to perform is installed in the intersection.
In FIG. 4, 1, 5, 19-23 and 25 are the same as those in FIG. In FIG. 4, an intersection 26 is shown.

First, FIG. 3 will be described.
In FIG. 3 (a), the vehicle-mounted control device 17a of the vehicle-mounted device 9a of FIG. 1 takes in the received data received by the road-to-vehicle communication radio device B13a from the roadside device 5a, and from the received data, “directivity of transmission / reception antenna” This information is extracted and the directivity of the road-to-vehicle communication antenna A12a of the road-to-vehicle communication wireless device A11a is changed.
In the service providing area 25, the in-vehicle control device 17a of the in-vehicle device 9a obtains the directivity information, in this case, from the information "set to have directivity forward for communication with the roadside device A" Control is performed so that road-to-vehicle communication can be performed by the road-to-vehicle communication wireless device A11a, and the directivity of the road-to-vehicle communication antenna A12a is set to have directivity in accordance with this information.

Then, the vehicle 20a enters the service providing area 25 as shown in FIG. The vehicle-mounted wireless communication device 10 is set so that the vehicle 20a exists in the road-to-vehicle communication possible area 21 of the roadside device A1 and can perform road-to-vehicle communication by the road-to-vehicle communication wireless device A11a mounted on the vehicle 20a. Therefore, the reception processing of the transmission data from the roadside machine A1 is performed.
The road-to-vehicle communication wireless device A11a of the vehicle 20a receives transmission data from the roadside device A1 as reception data via the road-to-vehicle communication antenna A12a, and the in-vehicle control device 17a is connected to the road-to-vehicle communication wireless device A11a. The received received data is taken in and the received data is output to the HMI device 18a.
If the received data from the in-vehicle control device 17a is image data, the HMI device 18a provides information to the driver of the vehicle 20a by an image. If the received data is voice data, the HMI device 18a provides information to the driver by voice.
In the vehicle 20a, since the directivity of the transmission / reception antenna for road-to-vehicle communication A12a is set so as to be directed forward in the presence of the roadside device A1, road-to-vehicle communication with the roadside device A1 is established in an optimal state. Degradation of communication quality as a system can be avoided.

In FIG. 3B, the vehicle-mounted control device 17a of the vehicle-mounted device 9a in FIG. 1 takes in the received data received by the road-to-vehicle communication radio device B13a from the roadside device B5a, and from the received data, “directivity of transmission / reception antenna” This information is extracted and the directivity of the inter-vehicle communication antenna 16a of the inter-vehicle communication wireless device 15a is changed.
The vehicle-mounted control device 17a of the vehicle-mounted device 9a has information on the directivity of the transmission / reception antenna, in this case “information is set so as to have directivity in the entire vehicle circumference direction for inter-vehicle communication with other vehicles in the vicinity”. Therefore, in the service providing area 25, the vehicle-to-vehicle communication wireless device 15a is controlled to perform vehicle-to-vehicle communication, and the directivity of the vehicle-to-vehicle communication antenna 16a is directed in the direction of the entire vehicle according to the information. Set to.

Then, the vehicle 20a enters the service providing area 25 as shown in FIG. In the service providing area 25, information is extracted in the road-to-vehicle communication with the roadside machine B 5 b that “the vehicle is set to have directivity in the entire circumference direction for inter-vehicle communication with other vehicles in the vicinity”. In addition, since the vehicle 20b is controlled so that the vehicle-to-vehicle communication device 15b can perform vehicle-to-vehicle communication from the vehicle-mounted control device 17b, the vehicle 20a receives information through vehicle-to-vehicle communication with the vehicle 20b.
Here, it is necessary to determine that the vehicle 20a and the vehicle 20b exist in the service providing area 25, but there is no limitation on a method for determining the presence.
The in-vehicle control device 17a takes in the reception data received by the inter-vehicle communication wireless device 15a and outputs the reception data to the HMI device 18a. If the received data from the in-vehicle control device 17a is image data, the HMI device 18a provides information to the driver of the vehicle 20a by an image. If the received data is voice data, the HMI device 18a provides information to the driver by voice.
In the vehicle 20a, the directivity of the transmission / reception antenna 16a for inter-vehicle communication is set so as to be directed in the entire circumference direction of the host vehicle. Therefore, communication with vehicles existing in the vicinity is possible, and inter-vehicle communication with the vehicle 20b is possible. Since it is established in an optimum state, it is possible to avoid deterioration of communication quality as a system.

Next, FIG. 4 will be described.
In FIG. 4A, the in-vehicle control device 17a of the in-vehicle device 9a in FIG. 1 takes in the reception data received by the road-to-vehicle communication radio device B13a from the roadside device B5a, and “directivity of the transmission / reception antenna” from the reception data. This information is extracted and the directivity of the road-to-vehicle communication antenna A12a of the road-to-vehicle communication wireless device A11a is changed.
Here, in FIG. 4A, there are a service providing area 25a and a service providing area 25b adjacent to each other, and in each area, an information providing service is provided by road-to-vehicle communication with the roadside machine A1a and the roadside machine A1b. is there.
The vehicle-mounted control device 17a of the vehicle-mounted device 9a sets the directivity information, here “directive in all directions of the vehicle for communication with the roadside unit A1a and the roadside unit A1b having adjacent service areas. In the service providing area 25a and the service providing area 25b, the road-to-vehicle communication wireless device A11a controls the road-to-vehicle communication so that the directivity of the road-to-vehicle communication antenna A12a is determined according to the information. Set so as to have directivity in the direction of the entire vehicle.

Then, the vehicle 20a enters the service providing area 25a as shown in FIG. The vehicle-mounted wireless communication device 10a is set so that the vehicle 20a is present in the road-to-vehicle communication possible area 21a of the roadside device A1a and can be communicated with the road-vehicle communication wireless device A11a mounted on the vehicle 20a. Therefore, the reception processing of the transmission data from the roadside device A1a is performed.
The radio device A11a for road-to-vehicle communication of the vehicle 20a receives transmission data from the roadside device A1a via the road-to-vehicle communication antenna A12a as reception data, and the vehicle-mounted control device 17a has the radio device for road-to-vehicle communication A11a. The received received data is captured and the received data is output to the HMI device 18a.
If the received data from the in-vehicle control device 17a is image data, the HMI device 18a provides information to the driver of the vehicle 20a by an image. If the received data is voice data, the HMI device 18a provides information to the driver by voice.
In the vehicle 20a, the directivity of the transmission / reception antenna A12a for road-to-vehicle communication is set so as to have the entire circumference in the vicinity of the own vehicle, and therefore communication is possible only in the road-to-vehicle communication possible area 21a of the roadside unit A1a. Since there is no interference from the adjacent roadside device A1b and road-to-vehicle communication with the roadside device A1a is established in an optimal state, it is possible to avoid deterioration in communication quality as a system.

In FIG. 4B, the in-vehicle control device 17a of the in-vehicle device 9a in FIG. 1 takes in the reception data received by the road-to-vehicle communication radio device B13a from the roadside device B5a, and “directivity of transmission / reception antenna” from the reception data. This information is extracted and the directivity of the road-to-vehicle communication antenna A12a of the road-to-vehicle communication wireless device A11a is changed.
The vehicle-mounted control device 17a of the vehicle-mounted device 9a is configured to have directivity in the direction information, in this case, “in order to communicate with the roadside device A1b installed at the intersection 26, in the direction of installation of the roadside device A1b”. In the service providing area 25b, the road-to-vehicle communication wireless device A11a controls the road-to-vehicle communication so that road-to-vehicle communication can be performed. Set to have directivity.

Then, as shown in FIG. 4B, the vehicle 20a enters the service providing area 25b after passing through the roadside machine B5a. The vehicle-mounted wireless communication device 10 is set so that the vehicle 20a exists in the road-to-vehicle communication possible area 21b of the roadside device A1b and can perform road-to-vehicle communication by the road-to-vehicle communication wireless device A11a mounted on the vehicle 20a. Therefore, the reception processing of the transmission data from the roadside device A1b is performed.
The radio device A11a for road-to-vehicle communication of the vehicle 20a receives transmission data from the roadside device A1b via the antenna for road-to-vehicle communication A12a as reception data, and the vehicle-mounted control device 17a includes the radio device for road-to-vehicle communication A11a. The received received data is captured and the received data is output to the HMI device 18a.
If the received data from the in-vehicle control device 17a is image data, the HMI device 18a provides information to the driver of the vehicle 20a by an image. If the received data is voice data, the HMI device 18a provides information to the driver by voice.

  In the vehicle 20a, since the directivity of the transmission / reception antenna A12a for road-to-vehicle communication is set to be directed toward the installation position of the roadside device A1b, road-to-vehicle communication with the roadside device A1b is established in an optimal state. Degradation of communication quality as a system can be avoided.

It is a block diagram which shows the structure of the vehicle radio | wireless communications system by Embodiment 1 of this invention. It is an image figure which shows an example of the communication path | route of the vehicle radio | wireless communications system by Embodiment 1 of this invention. It is an image figure which shows an example of the communication path | route of the vehicle radio | wireless communications system by Embodiment 2 of this invention. It is an image figure which shows another example of the communication path | route of the vehicle radio | wireless communications system by Embodiment 2 of this invention.

Explanation of symbols

1 Roadside machine A
2 Transmit / receive antenna A for roadside equipment
3 Roadside wireless communication device A
4 Roadside control device A
5 Roadside machine B
6 Transmitter / receiver antenna B for roadside machine
7 Roadside wireless communication device B
8 Roadside control device B
9 Vehicle-mounted device 10 Vehicle-mounted wireless communication device 11 Road-to-vehicle communication wireless device A
12 Road-to-vehicle communication antenna A
13 Radio equipment B for road-to-vehicle communication
14 Road-to-vehicle communication antenna B
DESCRIPTION OF SYMBOLS 15 Radio apparatus for vehicle-to-vehicle communication 16 Antenna for vehicle-to-vehicle communication 17 Vehicle control device 18 HMI device 19 Road 20 Vehicle 21 Road-to-vehicle communication area with roadside machine A 22 Roadway-to-vehicle communication area with roadside machine B 23 Road-to-vehicle communication Directivity of road-to-vehicle communication transceiver antenna A for radio device A 24 Directionality of vehicle-to-vehicle communication antenna for vehicle-to-vehicle communication 25 Information service area 26 Intersection

Claims (5)

In a vehicle wireless communication system configured to perform wireless communication between a roadside device and another vehicle by an in-vehicle device mounted on the host vehicle,
The vehicle-mounted device includes a plurality of road-to-vehicle wireless communication means for performing road-to-vehicle wireless communication with a plurality of the roadside devices, a vehicle-to-vehicle wireless communication means for performing vehicle-to-vehicle wireless communication with other vehicles, and the above A plurality of road-to-vehicle wireless communication means and a control means for controlling the vehicle-to-vehicle wireless communication means,
The control means determines information from the first roadside device received by the first road-to-vehicle wireless communication means, and based on the determination result, the second roadside installed in front of the first roadside device. A vehicle radio communication system characterized by receiving either information from a machine or information from the other vehicle. In a vehicle wireless communication system configured to perform wireless communication between a roadside device and another vehicle by an in-vehicle device mounted on the host vehicle,
The vehicle-mounted device includes a plurality of road-to-vehicle wireless communication means for performing road-to-vehicle wireless communication with a plurality of the roadside devices, a vehicle-to-vehicle wireless communication means for performing vehicle-to-vehicle wireless communication with other vehicles, and the above A plurality of road-to-vehicle wireless communication means and a control means for controlling the vehicle-to-vehicle wireless communication means,
The control means determines information from the first roadside device received by the first road-to-vehicle wireless communication means, and based on the determination result, the second road-to-vehicle wireless communication means and the vehicle-to-vehicle wireless communication means. A vehicle radio communication system characterized by switching any of the communication characteristics.   The vehicle radio communication system according to claim 2, wherein the switching of the communication characteristics is performed by a modulation method.   The vehicle radio communication system according to claim 2, wherein the switching of the communication characteristics is performed according to reception sensitivity.   The vehicle radio communication system according to any one of claims 2 to 4, wherein the switching of the communication characteristics is performed by directivity of a transmission / reception antenna.

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