JP2011044002A - Inter-vehicle communication apparatus for vehicle - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To solve the following problems: when a DSSS optical beacon is installed on a road immediately after a VICS optical beacon, a vehicle may enter a communication area of the DSSS optical beacon before ending communication with the VICS optical beacon, and a vehicle side communication apparatus cannot transmit an uplink signal to the DSSS optical beacon, so that a user cannot receive DSSS service. <P>SOLUTION: In an optical beacon adjacent zone 40, a control part 17 prohibits an inter-vehicle communication apparatus 11 from receiving an information signal transmitted from a VICS optical beacon until a vehicle passes through a communication area of the VICS optical beacon. When the vehicle passes through a communication area of a DSSS optical beacon, the vehicle is not in communication, and the inter-vehicle communication apparatus 11 can reliably transmit an uplink signal to the DSSS optical beacon. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a vehicular road-to-vehicle communication device mounted on a vehicle to receive services such as a safe driving support system that provides various types of information via road-to-vehicle communication.

  Conventionally, as a service for providing various road traffic information to a running vehicle, there is a road traffic information communication system (VICS: Vehicle Information and Communication Systems, registered trademark). In recent years, in addition to this, a safe driving support system is provided. (DSSS: Driving Safety Support Systems) has been put into practical use. Both VICS and DSSS use infrared rays as a communication medium between a vehicle and a road device (hereinafter referred to as an optical beacon) that transmits information to the vehicle. Since these are the same communication medium, there has been a problem that the communication device on the vehicle side cannot receive the service by mixing the VICS and DSSS information. For example, Patent Document 1 discloses a technique that can receive each information without confusion with a single in-vehicle communication device.

  By the way, when entering the communication area of the VICS and DSSS optical beacons, the communication device on the vehicle side transmits a signal called an uplink signal including ID information of the own vehicle. By receiving this uplink signal, the DSSS optical beacon individually identifies the vehicle and transmits information for the vehicle. In addition, whether or not the communication device on the vehicle side has finished communication with the optical beacon, whether or not a predetermined time (for example, 3 seconds) has elapsed since the end of reception of the last information transmitted from the various optical beacons. Judgment based on. And, in order to prevent the uplink signal from being transmitted from the vehicle side more than necessary in the communication area of the optical beacon, until reception of information transmitted from the optical beacon is started and it is determined that the communication is terminated. During this period, the uplink signal is not transmitted.

  FIG. 9 is an explanatory diagram showing the basic operation of communication between the vehicle-side communication device and the VICS optical beacon. When the vehicle enters the communication area of the VICS optical beacon, the vehicle communication apparatus receives the VICS information signal transmitted from the optical beacon as shown in FIG. Upon receiving the VICS information signal, the vehicle-side communication device transmits an uplink signal to the VICS optical beacon according to the VICS information signal. The uplink signal includes an ID number for determining each vehicle individually, travel time measurement information indicating how long it took to travel a certain section, and the like. The travel time measurement information included in the uplink signal is used in VICS to grasp the road traffic situation such as which point is currently congested. In communication with the VICS, even when no uplink signal is transmitted, the main VICS information signal can be received and used on the vehicle side.

  On the other hand, FIG. 10 is an explanatory view showing a basic operation of communication between the vehicle side communication device and the DSSS optical beacon. When the vehicle enters the DSSS optical beacon communication area, the vehicle-side communication device receives a downlink signal transmitted from the DSSS optical beacon as shown in FIG. When the communication device on the vehicle side receives the downlink signal, it transmits an uplink signal to the DSSS optical beacon according to the downlink signal. When the DSSS optical beacon receives an uplink signal, the DSSS optical beacon transmits a DSSS information signal including an ID number included in the uplink signal to the communication device on the vehicle side. When the received DSSS information signal includes an ID number indicating the host vehicle, the vehicle-side communication device determines that the information is for the host vehicle and receives the information. In DSSS, unless an uplink signal is transmitted from the vehicle side, a main DSSS information signal cannot be received and used.

  The main purpose of VICS is to provide traffic information and parking space availability information, and optical beacons are installed at predetermined intervals along the road. On the other hand, since DSSS is mainly intended to provide information for raising safety to drivers in order to reduce traffic accidents, optical beacons are installed at places where traffic accidents occur frequently. For this reason, there are actually places where optical beacons of VICS and DSSS are installed close to each other on the road.

JP 2009-98892 A

  However, in places where optical beacons such as VICS and DSSS are installed in close proximity, reception of information transmitted from the previous optical beacon is started and it is determined that communication has been terminated. The vehicle may enter or pass through the communication area of the optical beacon after it is done. In this case, when the preceding optical beacon is a VICS optical beacon and the adjacent optical beacon is a DSSS optical beacon, the communication sequence is as shown in FIG. As illustrated in FIG. 11, the vehicle-side communication device receives a downlink signal from a DSSS optical beacon before it is determined that communication with the VICS optical beacon has ended. However, even though the communication with the VICS has actually ended, it is determined that the communication with the VICS is continued because the DSSS signal is received before the elapse of a predetermined time required for determining the end of the communication. Therefore, the uplink signal cannot be transmitted in response to the received DSSS downlink signal. For this reason, the user cannot receive the DSSS service.

  The present invention has been made in view of the above problems, and its purpose is to improve on optical beacons such as DSSS even when various optical beacons such as VICS and DSSS are installed close to the road. It is an object of the present invention to provide a vehicular road-to-vehicle communication device that can reliably receive a service that needs to transmit a link signal.

  In order to solve the above-mentioned problem, a vehicular road-to-vehicle communication device according to claim 1 includes: a signal receiving unit that receives a signal transmitted from a roadside unit into a communication area of the roadside unit; In response to the signal received by the signal receiving means, the communication period determining means for starting the reception of the signal and determining the continuous communication period from the last reception of the subsequent signal to the elapse of a predetermined time, An uplink signal transmitting means for transmitting an uplink signal to the roadside device, an uplink determining means for determining whether the roadside device has received the uplink signal transmitted by the uplink signal transmitting means, and the uplink When the determination means determines that the roadside device has received the uplink signal, transmission of the uplink signal is prohibited during the communication period determined by the communication period determination means. After the transmission prohibiting means and the first roadside device that transmits a signal to the vehicle existing in the communication area, the second roadside device that transmits a signal for the vehicle to the vehicle that transmitted the uplink signal. In the communication area of the first roadside machine specified by the roadside machine specifying means and the signal receiving means in the communication area of the first roadside machine specified by the roadside machine specifying means It is prohibited to receive a signal transmitted from the first roadside device, or prohibited from transmitting an uplink signal in response to a signal transmitted from the first roadside device by the uplink signal transmission means. And a control means.

  According to the first aspect of the present invention, the first signal for transmitting the uplink signal is transmitted in the vicinity of the first optical beacon that transmits the signal to the vehicle existing in the communication area. When two optical beacons are installed, it is prohibited to receive a signal transmitted from the first optical beacon, or an uplink signal is transmitted in response to a signal transmitted from the first optical beacon. Is prohibited. Therefore, it is possible to reliably transmit an uplink signal to the second optical beacon, and to receive a service by a signal transmitted from the second optical beacon.

  The vehicle road-to-vehicle communication device according to claim 2 receives a signal transmitted from the first roadside device by the signal receiving unit by stopping reception of the signal by the signal receiving unit by the control unit. This is prohibited. By stopping the operation of the signal receiving means, the information signal transmitted from the first optical beacon is not received within the communication area of the first optical beacon, and the uplink signal can be transmitted. Absent. Therefore, an uplink signal can be reliably transmitted to the second optical beacon.

  According to a third aspect of the present invention, there is provided a vehicular road-to-vehicle communication device in which a vehicle position detecting means for detecting a vehicle position and a second roadside device are installed within a predetermined distance after the first roadside device. Roadside machine proximity zone storage means for storing the roadside machine proximity zone, and the vehicle position detected by the vehicle position detection means by the control means is stored by the roadside machine proximity zone storage means. When entering the zone, in the communication area of the first roadside machine, the signal receiving means prohibits the reception of the signal transmitted from the first roadside machine, or the uplink signal transmission means It is prohibited to transmit an uplink signal in response to a signal transmitted from the first roadside device. Thereby, the same effect as that of claim 1 can be obtained.

  The road-to-vehicle communication device for a vehicle according to claim 4 includes own vehicle speed detecting means for detecting the own vehicle speed, and the own vehicle position detected by the own vehicle position detecting means in the control means is close to the roadside machine. When the vehicle speed detected by the vehicle speed detection means is faster than a predetermined speed when entering the zone adjacent to the roadside machine stored by the zone storage means, a signal is sent within the communication area of the first roadside machine. The reception means prohibits reception of a signal transmitted from the first roadside machine, or the uplink signal transmission means transmits an uplink signal in response to the signal transmitted from the first roadside machine. It is prohibited to do. When the vehicle speed is low, when the vehicle passes through the communication area of the second optical beacon installed in the vicinity of the first optical beacon, there is a high possibility that the communication is terminated. As a result, when the vehicle speed is low, it is possible to receive the information signal transmitted from the first optical beacon even in the optical beacon proximity zone.

  The road-to-vehicle communication device for a vehicle according to claim 5 is characterized in that the roadside machine position information storage means for storing the positions where the first roadside machine and the second roadside machine are installed, and the signal receiving means include the roadside machine position. When an information signal is received from the first roadside machine or the second roadside machine at a location other than the position where the first roadside machine and the second roadside machine stored in the information storage means are installed A roadside machine position information update unit for updating the location as a location where the first roadside machine or the second roadside machine is installed based on the received signal, and roadside machine position information update. A roadside machine proximity zone updating means for additionally updating the roadside machine proximity zone storage means when a new roadside machine proximity zone is generated by the first roadside machine or the second roadside machine additionally updated by the means It is characterized by that. According to the invention described in claim 5, even when the first and second optical beacons are newly installed, the position information of each optical beacon and the optical beacon proximity zone can be additionally updated, and the user can It becomes possible to receive the service of the second optical beacon without omission.

  According to a sixth aspect of the present invention, there is provided a vehicular road-to-vehicle communication device in which a vehicle position detecting means for detecting a vehicle position and a second roadside machine are installed close to each other within a predetermined range after the first roadside machine. And a proximity roadside machine position information storage means for storing the position information of the first roadside machine, the vehicle position detected by the vehicle position detection means by the control means is determined by the proximity roadside machine position information storage means. When it exists in the communication area of the first roadside device stored, it is prohibited to receive a signal transmitted from the first roadside device by the signal receiving means in the communication area of the first roadside device. Or, it is prohibited to transmit an uplink signal in response to a signal transmitted from the first roadside device by the uplink signal transmitting means. Thereby, the same effect as that of claim 1 can be obtained.

In order to solve the above-mentioned problem, the invention described in claim 7 includes: a vehicle position detection unit that detects a vehicle position; and a first roadside device that transmits a signal to a vehicle existing in a communication area. A first type of signal to be transmitted and a second type of signal transmitted from a second roadside device that identifies a vehicle that exists in the communication area and transmits a signal for the identified vehicle. A receiving means for receiving, a determining means for starting reception of a signal by the receiving means, and determining that reception has ended when a predetermined time has elapsed since the last reception of the subsequent signal; and a predetermined reachable within a predetermined time Roadside machine specifying means for specifying the first roadside machine in which the second roadside machine is installed in the vicinity, and
When the own vehicle position detected by the own vehicle position detecting means exists in the communication area of the first roadside machine specified by the roadside machine specifying means, reception of the first type signal by the receiving means is prohibited. Received when the vehicle position detected by the vehicle position detection means passes the communication area of the first roadside machine specified by the roadside machine specifying means after the reception is prohibited by the prohibition means and the prohibition means. And a permission means for permitting reception by the means.

  According to the seventh aspect of the present invention, the vehicle existing in the communication area is specified in close proximity to the first optical beacon that transmits a signal to the vehicle existing in the communication area. When a second optical beacon that transmits a signal directed to a vehicle is installed, it is prohibited to receive a signal transmitted from the first optical beacon. Therefore, the service of the second optical beacon can be surely received.

It is a block diagram which shows the whole structure of the car navigation apparatus 10 in a present Example. It is a figure which shows the communication area | region of the optical beacon 100 in a present Example. It is a figure which shows the optical beacon position information memorize | stored in the map data storage part 12 in a present Example. The schematic diagram (a) of the optical beacon proximity zone 40 in a present Example and the specific explanatory drawing (b) of the optical beacon proximity zone 40 in a present Example are shown. It is a figure which shows the communication sequence between the road-vehicle communication apparatus 11 in a present Example, and the optical beacon of VICS and DSSS. It is a figure which shows the communication sequence between the road-vehicle communication apparatus 11 in the optical beacon proximity zone 40 of a present Example, and the optical beacon of VICS and DSSS. It is a flowchart performed in the control part 17 in a present Example. It is a figure which shows the communication sequence between the road-to-vehicle communication apparatus 11 in the optical beacon proximity zone 40 in the modification 1 of a present Example, and the optical beacon of VICS and DSSS. It is a figure which shows the communication sequence of the conventional vehicle side control apparatus and the optical beacon of VICS. It is a figure which shows the communication sequence of the conventional vehicle side control apparatus and the optical beacon of DSSS. It is a figure which shows the communication sequence of the conventional vehicle side control apparatus and the optical beacon of VICS and DSSS.

  Embodiments of the present invention will be described below with reference to the drawings. In this embodiment, the vehicular road-to-vehicle communication device of the present invention is described as being built in a car navigation device, but it may be externally attached separately from the car navigation device. In this embodiment, the roadside machine is described as an optical beacon. However, for example, a roadside machine that communicates with a vehicle using a radio wave beacon or other communication medium may be used. The present invention is not limited to the following examples, and can take various forms as long as they are within the technical scope of the present invention.

(Example)
FIG. 1 is a block diagram showing the overall configuration of the car navigation device 10 of this embodiment. The car navigation device 10 according to this embodiment includes a road-to-vehicle communication device 11, a map data storage unit 12, a vehicle position detection unit 13, an operation switch 14, a display device 15, a sound output device 16, and a control unit 17. The The car navigation device 10 communicates with various optical beacons 100 via the road-to-vehicle communication device 11.

  The road-vehicle communication device 11 transmits and receives various signals to and from various optical beacons 100 using infrared as a communication medium. Various signals transmitted from the optical beacon 100 specify signals that are intermittently transmitted for all vehicles existing in the communication area of the optical beacon and vehicles existing in the communication area of the optical beacon, There are signals transmitted for the identified vehicle. As shown in FIG. 2, the communication area of the various optical beacons 100 is a range on a road approximately 6 meters before and after the installation point of the optical beacons 100. The road-vehicle communication device 11 includes a data conversion unit 111. The data converter 111 converts an electrical signal including various information into an infrared signal for transmission to the optical beacon 100, and reversely converts the received infrared signal into an electrical signal. . An electrical signal including various information inversely converted by the data conversion unit 111 is input to the control unit 17 and is notified to the user via the display device 15 and the audio output device 16.

  In addition, the road-to-vehicle communication device 11 determines whether or not the communication with the optical beacon has ended, and a predetermined time (3 seconds in this embodiment) has elapsed since the reception of the last information transmitted from the optical beacon. Judgment based on whether or not. When a downlink signal or various information signals transmitted from an optical beacon are received within 3 seconds after the last information is received, it is determined that information from the same beacon is being received.

  Furthermore, the road-to-vehicle communication device 11 determines whether the transmitted uplink signal is received by the optical beacon. Whether or not the uplink signal is received by the optical beacon is determined by whether or not the vehicle ID is included in the information signal transmitted from the optical beacon after transmitting the uplink signal. When the vehicle ID is included in the information signal, it is determined that the uplink signal is received in the optical beacon. When the vehicle ID is not included in the information signal, the uplink signal is received in the optical beacon. Judge that it is not. The road-to-vehicle communication device 11 does not transmit the uplink signal until it is determined that the communication with the optical beacon is completed after it is determined that the uplink signal is received by the optical beacon. This is because the downlink signals and various information signals are intermittently transmitted from the various optical beacons, and accordingly, the uplink signals are prevented from being transmitted more than necessary.

  The map data storage unit 12 stores route data 121 necessary for searching for a route to the destination, drawing data 122 necessary for drawing a map on the display device 15, and positions of various light beacons in latitude / Optical beacon position information 123 stored as longitude information, and although not shown, guidance images, audio data, and the like are stored. Note that a ROM (Read Only Memory), a readable / writable hard disk, a memory, or the like can be used as the storage medium.

  In the route data 121, road map information is stored as network information including a node indicating a connection point and a link connecting the nodes in order to search for a route to the destination. For example, information such as an identification number assigned to each link or node, a road type, and the number of lanes is assigned to the link and node corresponding to each road and intersection. A cost based on these pieces of information is set for each link and node. Based on the network information and the cost stored in the route data 121, the control unit 17 performs an optimum route calculation to the destination using a known Dijkstra method or the like so that the product sum value of the cost is minimized.

  The drawing data 122 includes polygon data of facilities such as roads, railways, buildings, private land, etc., background data for drawing terrain such as seas and rivers, and position information for various facilities existing on the map. The facility data which memorize | store etc. are memorize | stored.

  The optical beacon position information 123 is information as shown in FIG. 3. For each optical beacon, the type of the optical beacon, the installation position of the optical beacon, the link number of the road where the optical beacon is installed, the optical beacon proximity zone 40 Information such as whether it is an optical beacon. Moreover, the information of the optical beacon proximity zone 40 is given in consideration of the direction of the traveling direction of the vehicle.

  As shown in FIG. 4A, the optical beacon proximity zone 40 is an area on the road where the DSSS optical beacon is located immediately after the VICS optical beacon. In addition, whether or not each optical beacon is installed in close proximity is based on whether or not the distance between each optical beacon is within 50 meters, and this value determines whether communication with the optical beacon ends. It is set based on the distance traveled by the vehicle of 60 km / h during 3 seconds. In addition, the optical beacon proximity zone 40 takes into account that the communication area of the optical beacon is about 6 meters, as shown in FIG. The area on the road to the DSSS optical beacon installation position.

  The own vehicle position detection unit 13 receives a radio wave transmitted from a GPS (Global Positioning System) via a GPS antenna, detects the own vehicle position and the current time, and a rotational motion applied to the vehicle. Is provided with a gyro sensor 132 for detecting the size of the vehicle and a vehicle speed sensor 133 for detecting the speed of the vehicle. The own vehicle position detection unit 13 calculates the current own vehicle position of the vehicle as a set of the position coordinates and the traveling direction based on each detection signal. Since these sensors 131 to 133 have errors of different properties, they are configured to detect the vehicle position while complementing each other. In addition, you may comprise the own vehicle position detection part 13 by the one part sensor mentioned above. Further, a geomagnetic sensor for detecting a traveling direction from geomagnetism, a steering rotation angle sensor, or the like may be added.

  As the operation switch 14, a plurality of button switches provided around the display device 15 are used. The user can make various settings via the operation switch 14 and output the settings to the control unit 17.

  The display device 15 is a liquid crystal display capable of color display. Various information such as information input by the user via the operation switch 14 and information received via the road-to-vehicle communication device 11 is displayed.

  The voice output device 16 includes a speaker, and outputs various guidance voices based on guidance voice data stored in the map data storage unit 12.

  The control unit 17 is mainly configured by a known microcomputer including a CPU, a ROM, a RAM, an I / O, a bus line connecting these components, and the like. And based on the program memorize | stored in ROM etc., the information display process which displays the information input by the user, the information received via the road-to-vehicle communication apparatus 11 on the display apparatus 15, or the road-to-vehicle communication apparatus 11 The communication process etc. which perform transmission / reception of information with each optical beacon are performed.

  In addition, the road-vehicle communication apparatus 11 of a present Example is corresponded to the uplink signal transmission means and signal receiving means of this invention. The vehicle position detection unit 13 of the present embodiment corresponds to the vehicle position detection means and the vehicle speed detection means of the present invention. The map data storage unit 12 of this embodiment corresponds to the roadside machine specifying means, roadside machine proximity zone storage means, position information storage means, and proximity roadside machine position information storage means of the present invention. The control unit 17 corresponds to communication end determination means, control means, roadside machine position information update means, and roadside machine proximity zone update means.

  Next, referring to FIG. 5 and FIG. 6, the operation of communication between the road-vehicle communication device 11 and the VICS and DSSS optical beacons when the VICS and DSSS optical beacons are continuously installed. explain. FIG. 5 shows road-to-vehicle communication when a VICS optical beacon is first installed and then a DSSS optical beacon is installed, and each optical beacon is not installed within 50 meters. The communication sequence between the apparatus 11 and each optical beacon is shown. In this case, it is determined that the communication with the VICS optical beacon is completed 3 seconds after the last received VICS information signal in the communication area of the VICS optical beacon. At that time, the vehicle has not yet entered the communication area of the DSSS optical beacon. Therefore, when the vehicle enters the DSSS optical beacon communication area, since the communication with the VICS optical beacon is completed, the road-to-vehicle communication device 11 transmits an uplink signal to the DSSS optical beacon. And can receive DSSS information signals.

  On the other hand, FIG. 6 shows a communication sequence between the road-vehicle communication device 11 and each optical beacon when the vehicle enters the optical beacon proximity zone 40. In this case, when the vehicle enters the optical beacon proximity zone 40, reception of the VICS information signal transmitted from the VICS optical beacon is prohibited by the control unit 17, and the road-to-vehicle communication device 11 does not receive the VICS information signal. The control unit 17 prohibits reception of the VICS information signal by transmitting a signal to stop the operation to the road-vehicle communication device 11. Since the road-vehicle communication apparatus 11 does not receive the VICS information signal, it does not transmit an uplink signal to the VICS optical beacon. When the vehicle passes through the communication area of the VICS optical beacon, the control unit 17 cancels the prohibition of reception of the VICS information signal. When the vehicle enters the DSSS optical beacon communication area, the road-to-vehicle communication device 11 receives a downlink signal from the DSSS optical beacon and transmits an uplink signal accordingly. The DSSS optical beacon that has received the uplink signal transmits a DSSS information signal to the vehicle. It is determined that the communication has ended 3 seconds after the road-to-vehicle communication device 11 receives the last DSSS information signal.

  FIG. 7 shows a flowchart of the road-to-vehicle communication process in the optical beacon proximity zone 40 executed by the control unit 17 in the car navigation device 10. The process shown in this flowchart is executed according to a computer program stored in the control unit 17.

  First, in this process, it is determined whether or not the traveling vehicle has entered the optical beacon proximity zone 40 in step S71 in FIG. The determination is made based on whether or not the own vehicle position detected by the own vehicle position detection unit 13 has entered the section of the optical beacon proximity zone 40 stored in the optical beacon position information 123 on the road link. When the own vehicle enters the optical beacon proximity zone 40 (step S71: YES), the process proceeds to step S73. Step S71 repeats self-transition until the own vehicle enters the optical beacon proximity zone 40.

  In step S73, the road-to-vehicle communication device 11 is prohibited from receiving a VICS information signal transmitted from a VICS optical beacon. In step S75, it is determined whether the VICS optical beacon communication area has been passed. For example, when the vehicle travels 10 meters or more after passing through the installation position of the VICS optical beacon, it is determined that the vehicle has passed the communication area of the VICS optical beacon. If the communication area of the optical beacon for VICS has passed (step S75: YES), the process proceeds to step S77, the prohibition of reception of the downlink signal in the road-to-vehicle communication device 11 is canceled, and this process ends. Step S75 repeats self-transition until it is determined that the communication area of the VICS optical beacon has passed.

  As described above, according to the present embodiment, even when the vehicle position is in the optical beacon proximity zone 40 where the optical beacon of VICS and the optical beacon of DSSS are installed close to each other, Service can be given priority. Specifically, when the own vehicle enters the optical beacon proximity zone 40, the control unit 17 prohibits the road-to-vehicle communication device 11 from receiving the VICS information signal until it passes through the communication area of the VICS optical beacon. To do. Therefore, when the vehicle passes through the communication area of the DSSS optical beacon, since the communication is not performed, the road-to-vehicle communication device 11 surely transmits an uplink signal to the DSSS optical beacon. Can do. Thus, even in a zone where the VICS optical beacon and the DSSS optical beacon are installed close to each other, the driver can surely receive the DSSS service.

(Modification 1)
Next, a first modification of the present embodiment will be described. In this modification, instead of prohibiting the road-to-vehicle communication device 11 from receiving the VICS information signal transmitted from the VICS optical beacon in step S73 in the flowchart of the present embodiment, the road-to-vehicle communication device 11 receives the uplink signal. Is prohibited from being sent. Similarly, instead of prohibiting the road-to-vehicle communication device 11 from receiving the VICS information signal transmitted from the VICS optical beacon in step S77 in the flowchart of the present embodiment, the road-to-vehicle communication device 11 receives the uplink signal. Is prohibited from being sent. FIG. 8 shows a communication sequence between the road-to-vehicle communication device 11 and the VICS and DSSS optical beacons in the optical beacon proximity zone 40 according to this modification. As shown in FIG. 8, since the road-to-vehicle communication device 11 is prohibited from transmitting an uplink signal in the communication area of the VICS optical beacon, it transmits the uplink signal in response to the VICS information signal. There is nothing. Further, since the prohibition of transmission of the uplink signal is released when the DSSS optical beacon communication area is entered, it is possible to transmit the uplink signal to the DSSS optical beacon. Therefore, the road-to-vehicle communication device 11 can receive the DSSS information signal transmitted from the DSSS optical beacon. According to the present modification, the driver can receive VICS and DSSS services even in a zone where the VICS optical beacon and the DSSS optical beacon are installed close to each other.

(Modification 2)
Next, a first modification of the present embodiment will be described. In the present modification, in the optical beacon proximity zone 40, the control unit 17 prohibits reception of the VICS information signal when the own vehicle speed is faster than 60 km / h, and does not prohibit when the vehicle speed is slow. The vehicle speed can be acquired from the vehicle speed sensor 133. When the vehicle speed is low, it is unlikely to reach the DSSS optical beacon communication area within 3 seconds when the end of communication with the VICS optical beacon is determined. Therefore, when the vehicle speed is low, the VICS information signal transmitted from the VICS optical beacon can be received even in the optical beacon proximity zone 40, and the user can receive the VICS service. On the other hand, when the vehicle speed is high, the reception of the VICS information signal is prohibited in the reception area of the VICS optical beacon in the optical beacon proximity zone 40 as in the present embodiment.

(Modification 3)
Next, a second modification of the present embodiment will be described. In this modification, when information transmitted from an optical beacon is received at a point not stored in the map data storage unit 12, the type and position of the optical beacon are newly updated in the map data storage unit 12. . The type of the optical beacon can be determined from ID information included in the information transmitted from the optical beacon. Further, when a new optical beacon is updated in the map data storage unit 12, if a new optical beacon zone 40 in which a VICS optical beacon and a DSSS optical beacon are present in the vicinity is newly generated, it is combined. The map data storage unit 12 is updated. As a result, even when VICS and DSSS optical beacons are newly established, the driver can surely receive DSSS services.

(Modification 4)
Next, a third modification of the present embodiment will be described. In this modification, the location information of the VICS optical beacon in the case where a DSSS optical beacon is installed in the map data storage unit 12 immediately after the VICS optical beacon (for example, within 50 meters) is installed. Remember. When it is determined based on the vehicle position detected by the vehicle position detection unit 13 that the vehicle has entered the communication area of the optical beacon of the VICS at a speed of 60 km / h or more, the control unit 17 The communication device 11 is prohibited from receiving the VICS information signal transmitted from the VICS optical beacon. Therefore, when the vehicle passes through the communication area of the DSSS optical beacon that is installed in the vicinity of the VICS optical beacon, the road-to-vehicle communication device 11 reliably ensures that the DSSS light is not in communication. An uplink signal can be transmitted for the beacon. This ensures that the driver can receive DSSS services.

DESCRIPTION OF SYMBOLS 10 Car navigation apparatus 11 Road-to-vehicle communication apparatus 12 Map data memory | storage part 123 Optical beacon position information 13 Own vehicle position detection part 17 Control part 100 Optical beacon 40 Optical beacon proximity zone

Claims (7)

A signal receiving means for receiving a signal transmitted from the roadside machine into the communication area of the roadside machine;
Communication period determining means for starting a signal reception in the signal receiving means and determining a continuous communication period from the last reception of the subsequent signal until the elapse of a predetermined time;
In response to the signal received by the signal receiving means, an uplink signal transmitting means for transmitting an uplink signal to the roadside device;
Uplink determining means for determining whether the roadside unit has received the uplink signal transmitted by the uplink signal transmitting means;
If it is determined by the uplink determination means that the roadside device has received an uplink signal, retransmission prohibiting means for prohibiting transmission of an uplink signal in the communication period determined by the communication period determination means;
A second roadside device that transmits a signal for the vehicle to the vehicle that has transmitted the uplink signal is in a predetermined range after the first roadside device that transmits the signal to the vehicle existing in the communication area. Roadside machine specifying means for specifying the first roadside machine installed close to the inside,
In the communication area of the first roadside machine specified by the roadside machine specifying means, the signal receiving means prohibits reception of a signal transmitted from the first roadside machine, or the uplink A vehicular road-to-vehicle communication device, comprising: a control unit that prohibits transmission of an uplink signal in response to a signal transmitted from the first roadside unit by a signal transmission unit. In the vehicular road-to-vehicle communication device according to claim 1,
The vehicle is characterized in that the control means prohibits the signal receiving means from receiving a signal transmitted from the first roadside machine by stopping reception of the signal in the signal receiving means. Inter-vehicle communication device. In the vehicular road-to-vehicle communication device according to claim 1 or 2,
Own vehicle position detecting means for detecting the own vehicle position;
Roadside machine proximity zone storage means for storing a roadside machine proximity zone in which the second roadside machine is installed close to within a predetermined distance after the first roadside machine,
The control means, when the own vehicle position detected by the own vehicle position detection means enters the roadside machine proximity zone stored by the roadside machine proximity zone storage means, the communication area of the first roadside machine The signal receiving unit prohibits the signal transmitted from the first roadside unit from being received, or the uplink signal transmission unit transmits the signal transmitted from the first roadside unit. A vehicular road-to-vehicle communication device for prohibiting transmission of an uplink signal in response. In the vehicular road-to-vehicle communication device according to claim 3,
It has own vehicle speed detecting means for detecting own vehicle speed,
The control means is detected by the own vehicle speed detecting means when the own vehicle position detected by the own vehicle position detecting means enters the roadside machine proximity zone stored by the roadside machine proximity zone storage means. When the own vehicle speed is higher than a predetermined speed, in the communication area of the first roadside machine, the signal receiving means prohibits reception of a signal transmitted from the first roadside machine, Alternatively, the vehicle road-to-vehicle communication device for prohibiting transmission of an uplink signal in response to a signal transmitted from the first roadside device by the uplink signal transmission means. In the vehicular road-to-vehicle communication device according to claim 3 or 4,
Roadside machine position information storage means for storing positions where the first roadside machine and the second roadside machine are installed;
In the place where the signal receiving means is not at the position where the first roadside machine and the second roadside machine are stored in the roadside machine position information storage means, the first roadside machine or When an information signal is received from the second roadside machine, the location is stored as the location of the first roadside machine or the second roadside machine based on the received signal. Roadside machine position information updating means for additionally updating to,
When the roadside machine proximity zone is newly generated by the first roadside machine or the second roadside machine additionally updated by the roadside machine position information update unit, the roadside machine proximity zone storage unit is additionally updated. A vehicular road-to-vehicle communication device comprising roadside unit proximity zone updating means. In the vehicular road-to-vehicle communication device according to claim 1,
Own vehicle position detecting means for detecting the own vehicle position;
Proximity roadside machine position information storage means for storing position information of the first roadside machine in which the second roadside machine is installed in the vicinity of a predetermined range after the first roadside machine,
When the own vehicle position detected by the own vehicle position detection means is within the communication area of the first roadside machine stored by the adjacent roadside machine position information storage means, the control means In the communication area of the roadside unit, the signal receiving unit prohibits the signal transmitted from the first roadside unit from being received, or the uplink signal transmitting unit transmits the first roadside unit. A vehicular road-to-vehicle communication device for prohibiting transmission of an uplink signal in response to a signal transmitted from the vehicle. Own vehicle position detecting means for detecting the own vehicle position;
A first type of signal transmitted from a first roadside device that transmits a signal to a vehicle existing in the communication area, a vehicle existing in the communication area, and a signal for the specified vehicle Receiving means for receiving a second type of signal transmitted from the second roadside machine for transmitting
Determination means for starting reception of the signal by the reception means, and determining that reception has ended when a predetermined time has elapsed since the last reception of the subsequent signal;
Roadside machine specifying means for specifying the first roadside machine in which the second roadside machine is installed in proximity within a predetermined range reachable within the predetermined time;
When the own vehicle position detected by the own vehicle position detection means exists in the communication area of the first roadside machine specified by the roadside machine specifying means, the signal of the first type by the receiving means Prohibition means to prohibit reception,
The reception is performed when the vehicle position detected by the vehicle position detection unit passes the communication area of the first roadside device specified by the roadside device specifying unit after the reception is prohibited by the prohibition unit. A vehicular road-to-vehicle communication device comprising: permission means for permitting reception by the means.

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