JP5321717B2 - Road-to-vehicle and vehicle-to-vehicle communication system, road-to-vehicle and vehicle-to-vehicle communication method, program thereof, and program recording medium - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a road-to-vehicle and vehicle-to-vehicle communication systems capable of stably communicating information to a specified communication destination even when positional relation to a vehicle changes frequently. <P>SOLUTION: An in-vehicle communication apparatus 1 comprises: a transmission destination determination part 13, to a peripheral communication apparatus information table in which peripheral position information transmitted periodically from peripheral in-vehicle communication apparatuses 2 to N and reception time at which the peripheral position information is received is registered; and an in-vehicle communication control part 12 selecting an in-vehicle communication apparatus relaying information for an in-vehicle communication apparatus N being a specified communication destination from the peripheral communication apparatus information table based on information showing a geographic position or area in which the in-vehicle communication apparatus N exists and the peripheral position information and the reception time registered lately to the peripheral communication apparatus information table, and transmitting the information for the in-vehicle communication apparatus N as a radio signal whose transmission destination is the in-vehicle communication apparatus selected for relaying, when the in-vehicle communication apparatus N is not registered in the peripheral communication apparatus information table in the transmission destination determination part 13 in the case of communicating the information to the in-vehicle communication apparatus N. <P>COPYRIGHT: (C)2012,JPO&amp;INPIT

Description

  The present invention relates to a road-to-vehicle and vehicle-to-vehicle communication system, a road-to-vehicle and vehicle-to-vehicle communication method, a road-to-vehicle and vehicle-to-vehicle communication program, and a program recording medium.

  Along with the development of communication technology in recent years, vehicle-to-vehicle communication systems that perform communication between moving vehicles using vehicle-mounted communication devices mounted on vehicles, roadside communication devices and vehicles installed on roadsides and interchanges of roads, etc. Road-to-vehicle communication systems that communicate with each other are becoming popular. For this reason, for example, in Japanese Patent Application Laid-Open No. 2005-12522, “Vehicle-to-vehicle communication method and device” in Patent Document 1, vehicle communication that suppresses redundant traffic in which vehicle-to-vehicle communication increases and can effectively use a radio band. In order to enable communication, the in-vehicle communication device that is the communication source is the in-vehicle communication device that should receive the information from the in-vehicle communication device and perform the transmission operation by further relaying the received information. Proposes a communication method that broadcasts information specifying whether or not.

JP 2005-12522 A

  However, the information transmission method as described in Patent Document 1 is not suitable for use in transmitting required information to a specified communication destination in a road-to-vehicle and vehicle-to-vehicle communication system. It is difficult to accurately check whether or not the communication destination is a communication destination that can communicate directly from the in-vehicle communication device that is the communication source, and to efficiently transmit the information using the radio band efficiently.

  In general, in road-to-vehicle and vehicle-to-vehicle communication systems, when trying to communicate with a vehicle that exists in a location where direct radio waves do not reach (for example, when you want to communicate with a vehicle that exists near an intersection in the direction of travel of the vehicle) In order to be able to select an in-vehicle communication device or roadside communication device mounted on another vehicle in the direction of the communication partner as a relay communication device, direct communication from the communication source in-vehicle communication device is possible. It is effective to use the position information of the peripheral in-vehicle communication devices or the position information of the peripheral roadside communication devices existing in the vicinity.

  However, since the positional relationship with the in-vehicle communication devices and roadside communication devices that exist in the vicinity always changes according to the traveling state of the vehicle, the peripheral in-vehicle communication devices that can communicate directly from the communication source in-vehicle communication device And the position information of roadside communication devices are adaptively managed according to the driving conditions of the vehicle, and when trying to actually communicate, the optimal communication partner at that time is determined as a relay communication device (vehicle communication device or roadside It is important to select it as a communication device.

  The present invention has been made in view of such circumstances, and each in-vehicle communication device or each road-side communication device adaptively and efficiently uses the position information of a peripheral in-vehicle communication device or a peripheral road-side communication device capable of direct communication. Even if the vehicle's positional relationship changes frequently, the road-to-vehicle and vehicle-to-vehicle communication system, road-to-vehicle and An object of the present invention is to provide a vehicle-to-vehicle communication method, a road-to-vehicle and vehicle-to-vehicle communication program, and a program recording medium.

  In order to solve the above-described problems, a road-to-vehicle and vehicle-to-vehicle communication system, a road-to-vehicle and vehicle-to-vehicle communication method, a road-to-vehicle and vehicle-to-vehicle communication program, and a program recording medium according to the present invention employ the following characteristic configurations. doing.

(1) In road-to-vehicle and vehicle-to-vehicle communication systems that communicate between vehicle-mounted communication devices and / or between vehicle-mounted communication devices and road-side communication devices, each vehicle-mounted communication device and road-side communication device are The position information of the in-vehicle communication device and the own road side communication device is transmitted as a radio signal, and the surrounding in-vehicle communication device and the roadside communication device transmit the wireless signal having the position information of each in-vehicle communication device and the roadside communication device to the peripheral position information. The peripheral position information is set and registered in the peripheral communication device information table together with the position information reception time when the peripheral position information was received, and the communication source vehicle-mounted communication device or roadside communication device specified When trying to transmit information to the on-board communication device or roadside communication device of the communication destination, before each of the onboard communication devices and roadside communication devices registered and registered in the latest peripheral communication device information table Whether the communication destination vehicle-mounted communication device or roadside communication device is within a range where the communication source vehicle-mounted communication device or roadside communication device can directly communicate based on the peripheral position information and the position information reception time Road-to-vehicle and vehicle-to-vehicle communication system for determining whether or not.

  According to the road-to-vehicle and vehicle-to-vehicle communication system, road-to-vehicle and vehicle-to-vehicle communication method, road-to-vehicle and vehicle-to-vehicle communication program, and program recording medium of the present invention, the following effects can be obtained.

  In other words, the in-vehicle communication device or roadside communication device that is the source of communication is the in-vehicle communication device that is installed in another vehicle that exists in the vicinity of the range where direct communication is possible or the roadside communication that is installed on the roadside of the road By collecting the location information (peripheral location information) periodically transmitted from the device and the reception time (location information reception time) when the location information was received, information on the communication device capable of direct communication is adaptively applied. If you are trying to communicate with a vehicle that is in a position where radio waves do not reach directly, such as a vehicle around an intersection in the traveling direction of the vehicle, the positional relationship of the vehicle changes frequently. Also, using the location information of the surrounding in-vehicle communication devices and roadside communication devices that are adaptively managed, the reception time when the location information was received, and information on the geographical location or area where the communication destination exists, Relay car Since the communication device or roadside communication device can be selected accurately, the wireless band is efficiently used and the information is stably transmitted to the in-vehicle communication device or roadside communication device of the designated communication destination. be able to.

1 is a system configuration diagram showing an example of a system configuration of a road-to-vehicle and vehicle-to-vehicle communication system according to the present invention. It is explanatory drawing for demonstrating an example of operation | movement of the vehicle-to-vehicle communication system of FIG. It is explanatory drawing which shows an example of the communicable range which can communicate directly with the vehicle-mounted communication apparatus shown in FIG. FIG. 3 is a table showing an example of a peripheral communication device information table in which information on peripheral vehicle communication devices that can be directly communicated by the vehicle communication device shown in FIG. 2 is set and registered.

  Preferred embodiments of a road-to-vehicle and vehicle-to-vehicle communication system, a road-to-vehicle and vehicle-to-vehicle communication method, a road-to-vehicle and vehicle-to-vehicle communication program, and a program recording medium according to the present invention will be described below with reference to the accompanying drawings. In the following description, the vehicle-to-vehicle communication system, the road-to-vehicle and vehicle-to-vehicle communication method according to the present invention will be described. However, the road-to-vehicle and vehicle-to-vehicle communication method can be executed by a computer as a road-to-vehicle and vehicle-to-vehicle communication program. Needless to say, the vehicle-to-vehicle and vehicle-to-vehicle communication programs may be recorded on a computer-readable recording medium.

(Features of the present invention)
Prior to the description of the embodiments of the present invention, an outline of the features of the present invention will be described first. The present invention relates to a technology that enables stable transmission of information from a running vehicle whose communication environment is constantly changing to a designated communication destination, and communicates with a vehicle that exists in a position where radio waves do not reach directly. When trying to do so, as a judgment material for selecting a relay vehicle communication device or a roadside communication device for relay, the surroundings that exist within the radio wave reachable range that can be directly communicated from the communication source vehicle communication device or roadside communication device By efficiently managing the position information of the in-vehicle communication device or the roadside communication device and the reception time when the position information is received and preferentially using the recently received position information, the positional relationship of the vehicle changes frequently. Even in such a case, information can be stably transmitted to a communication destination.

  In other words, in the road-to-vehicle and vehicle-to-vehicle communication system according to the present invention, a predetermined cycle is established between an in-vehicle communication device mounted on a running vehicle and an in-vehicle communication device that can directly communicate with the roadside communication device. The vehicle-mounted communication device and roadside communication device of each vehicle exchange the position information of the received surrounding vehicle-mounted communication device and roadside communication device and the reception time when the position information was received. Stored in the communication device information table.

  When information is to be transmitted to the specified communication destination, based on the peripheral communication device information table, it is determined whether the information can be directly transmitted to the specified communication destination, and the information is directly transmitted. If this is not possible, when selecting a relay in-vehicle communication device or roadside communication device that relays communication to the communication destination, in addition to the position information of the surrounding in-vehicle communication device and roadside communication device, the position Considering the reception time at which the information was received, giving priority, and determining the selection of the in-vehicle communication device or the roadside communication device for relaying, and the road-to-vehicle distance and Vehicle-to-vehicle communication is realized.

  In addition, when judging whether direct communication with the communication destination is possible, or when selecting an in-vehicle communication device or roadside communication device for relay, a peripheral in-vehicle communication device or roadside communication device capable of direct communication. The information combined with the position information related to the position information is not limited to the information of the reception time at which each position information is received, and information such as the traveling direction and traveling speed of the vehicle equipped with each in-vehicle communication device may be used. For example, as the information held in the peripheral communication device information table, in addition to the latest position information and the reception time of the position information, the position information received in the previous cycle, for example, and the position By holding the reception time of information, the traveling direction and traveling speed of vehicles existing in the vicinity where communication is possible may be calculated.

  In this way, based on the direction and speed of movement of surrounding in-vehicle communication devices, predict changes in the relative positional relationship between the surrounding in-vehicle communication device and roadside communication device and the communication source in-vehicle communication device and roadside communication device. Therefore, it is possible to select an in-vehicle communication device or a roadside communication device for relay more accurately, and it is possible to realize road-to-vehicle and vehicle-to-vehicle communication with higher efficiency and reliability.

(Configuration example of embodiment of the present invention)
FIG. 1 is a system configuration diagram showing an example of a system configuration of a road-to-vehicle and vehicle-to-vehicle communication system according to the present invention. For example, when applied to a vehicle-to-vehicle communication system, an in-vehicle communication device 1 mounted on a vehicle and others An example of a case where the in-vehicle communication device 2 mounted on the vehicle in the vehicle is within a range where radio waves reach each other directly, can perform direct communication, and transmits information using a wireless transmission / reception signal. ing.

  As shown in FIG. 1, the in-vehicle communication device 1 and the in-vehicle communication device 2 are configured to include at least in-vehicle wireless units 11 and 21, in-vehicle communication control units 12 and 22, and transmission destination determination units 13 and 23, respectively. Each of the in-vehicle communication device 1 and the in-vehicle communication device 2 is connected to the in-vehicle communication device external connection units 14 and 24 that are interface devices with an in-vehicle system outside the in-vehicle communication device.

  Each of the in-vehicle wireless unit 11 and the in-vehicle wireless unit 21 is a part that transmits and receives a radio signal using a predetermined wireless communication method and a wireless communication channel, and is mounted on a counterpart vehicle. Exchanges radio transmission / reception signals with each other.

  The in-vehicle communication control unit 12 and the in-vehicle communication control unit 22 control operations of the in-vehicle communication device 1 and the in-vehicle communication device 2, respectively, and data between the in-vehicle communication device external connection unit 14 and the in-vehicle communication device external connection unit 24. And the input / output operation of the wireless transmission / reception signal via the in-vehicle wireless unit 11 and the in-vehicle wireless unit 21 are controlled.

  The in-vehicle communication control unit 12 and the in-vehicle communication control unit 22 are respectively connected to the in-vehicle communication device external connection unit 14 and the in-vehicle communication device external connection unit from GPS (Global Positioning System) which is one of the in-vehicle systems outside the in-vehicle communication device. 24, the position information of the own vehicle acquired via 24 is periodically transmitted to each of the surrounding in-vehicle communication devices at a predetermined cycle via the in-vehicle wireless unit 11 and the in-vehicle wireless unit 21; When the position information of the surrounding vehicles periodically transmitted by the surrounding vehicles existing around each vehicle is received via the in-vehicle wireless unit 11 and the in-vehicle wireless unit 21, the received position information and the position The reception time when the information is received is output to the transmission destination determination unit 13 and the transmission destination determination unit 23, respectively.

  Furthermore, the in-vehicle communication control unit 12 and the in-vehicle communication control unit 22 communicate with the communication destination specified by the information from the in-vehicle system outside the in-vehicle communication device via the in-vehicle communication device external connection unit 14 and the in-vehicle communication device external connection unit 24. When trying to transmit to the in-vehicle communication device or roadside communication device, the geographical location information or area information of the communication destination in-vehicle communication device or roadside communication device is transmitted to the transmission destination determination unit 13 and the transmission destination determination unit 23. In response to this, a transmission destination acquisition request is issued to request acquisition of a transmission destination (for example, a relay vehicle-mounted communication device or a roadside communication device) that outputs the information. Here, the geographical position information or area information of the communication destination in-vehicle communication device or roadside communication device is, for example, position information on a map regarding an intersection existing in the traveling direction (forward) of the vehicle, For example, area information on the map regarding existing landmarks.

  The transmission destination determination unit 13 and the transmission destination determination unit 23 receive the position information of the surrounding vehicles periodically transmitted by the surrounding vehicles existing around the respective vehicles and the reception time when the position information is received. When receiving from the communication control unit 12 and the in-vehicle communication control unit 22, the in-vehicle communication device 1 and the in-vehicle communication device 2 directly communicate the received position information of each surrounding vehicle and the reception time when the position information is received. In other words, information (peripheral communication device information) related to the peripheral in-vehicle communication device or the peripheral roadside communication device is stored in the peripheral communication device information table for setting and registering.

  In addition, the transmission destination determination unit 13 and the transmission destination determination unit 23 try to transmit information to the in-vehicle communication device and the roadside communication device of the designated communication destination, respectively, the in-vehicle communication control unit 12 and the in-vehicle communication control unit 22. The specified communication destination communicates directly based on the peripheral communication device information related to the peripheral in-vehicle communication device and the peripheral roadside communication device held in the peripheral communication device information table when receiving the transmission destination acquisition request from It is determined whether or not exists within a possible range.

  Here, if it is determined that the specified communication destination exists in an area where direct communication is not possible, the communication destination in-vehicle communication device or roadside communication device included in the transmission destination acquisition request Relays communication to the specified communication destination based on the geographical location information or area information about the device and the peripheral communication device information related to the peripheral in-vehicle communication device and peripheral roadside communication device stored in the peripheral communication device information table The peripheral in-vehicle communication device or the peripheral roadside communication device for relay is selected as the transmission destination of the information to the communication destination, and the selected transmission destination is selected for the in-vehicle communication control unit 12 and the in-vehicle communication control unit 22, respectively. To return.

  On the other hand, when the in-vehicle communication device 1 and the in-vehicle communication device 2 can directly communicate as shown in FIG. 1, the peripheral communication related to the peripheral in-vehicle communication device and the peripheral roadside communication device held in the peripheral communication device information table. Since the machine information is held in each communication partner, the transmission destination determination unit 13 and the transmission destination determination unit 23 select the communication destination itself as the transmission destination so as to directly transmit the information to the communication destination. The selected transmission destination is returned to the in-vehicle communication control unit 12 and the in-vehicle communication control unit 22, respectively.

  As described above, each of the in-vehicle communication device external connection unit 14 and the in-vehicle communication device external connection unit 24 is an interface device with an in-vehicle system outside the in-vehicle communication device such as an in-vehicle application system, a GPS (Global Positioning System), and an in-vehicle sensor. The input data from the in-vehicle system outside the in-vehicle communication device is taken and output as the in-vehicle communication device input data to the in-vehicle communication device 1 and the in-vehicle communication device 2, respectively, while the in-vehicle communication device 1, the in-vehicle communication device Output data output from the communication device 2 as in-vehicle communication device output data is output to an in-vehicle system outside the in-vehicle communication device.

(Description of operation of this embodiment)
Next, an example of the operation of the inter-vehicle communication system according to the present embodiment shown in FIG. 1 will be described in more detail with reference to FIG. FIG. 2 is an explanatory diagram for explaining an example of the operation of the vehicle-to-vehicle communication system of FIG. 1, and an in-vehicle communication device 1 mounted on a certain vehicle is present around the vehicle (N -1) The operation | movement in the case of transmitting / receiving a radio | wireless transmission / reception signal between the vehicle-mounted communication devices 2, 3, ..., N mounted in each of the other vehicle of the unit is illustrated.

  In FIG. 2, the in-vehicle communication device 1 inputs data as in-vehicle communication device input data 12g via the in-vehicle communication device external connection unit 14 from an external in-vehicle system such as an in-vehicle application system. Conversely, data is output as in-vehicle communication device output data 12h to the in-vehicle system outside the in-vehicle communication device 1 via the in-vehicle communication device external connection unit 14. Further, the in-vehicle communication device 1 is connected to the in-vehicle communication devices 2, 3,..., N installed in each of the (N-1) peripheral vehicles existing around the vehicle in which the in-vehicle communication device 1 is mounted. On the other hand, the wireless transmission signal 11b is transmitted, and conversely, wireless communication is performed from the vehicle-mounted communication devices 2, 3,..., N mounted in the (N-1) peripheral vehicles existing around the vehicle. Received signal 11a is received.

  The in-vehicle wireless unit 11 constituting the in-vehicle communication device 1 includes (N-1) in-vehicle communication devices 2, 3,..., Which are present around the vehicle on which the in-vehicle communication device 1 is mounted. The wireless reception signal 11a from each of the in-vehicle wireless devices in N is received, and the received data is output to the in-vehicle communication control unit 12 as reception data 12e. The in-vehicle communication control unit 12 outputs the reception data 12e received from the in-vehicle wireless unit 11 to the in-vehicle communication device external connection unit 14 as the in-vehicle communication device output data 12h, and the in-vehicle communication device external connection unit 14 1 to the external in-vehicle system.

  The in-vehicle communication control unit 12 receives the reception data 12e received as the radio reception signal 11a from the in-vehicle communication devices 2, 3,... , N is the position information indicating the current position of each of the surrounding vehicles that are periodically transmitted at a predetermined cycle, the received position information of each of the surrounding vehicles The reception time at which the position information is received is output to the transmission destination determination unit 13 as surrounding vehicle position information 12a and position information reception time 12b. Receiving the surrounding vehicle position information 12a and the position information reception time 12b, the transmission destination determination unit 13 includes the position information of the in-vehicle communication devices 2, 3, ..., N of the surrounding vehicles and the reception time when the position information is received. The vehicle position information 12a and the position information reception time 12b are held in a peripheral communication device information table for setting and registering an in-vehicle communication device capable of direct communication at each time point.

  In addition, although the inter-vehicle communication as shown in FIG. 2 is not shown, in a system sharing road-to-vehicle and vehicle-to-vehicle communication, the position information of the road-side communication device is periodically transmitted from the road-side communication device set on the road side of the road. Similarly, the position information of the roadside communication device that can communicate at that time is set and registered in the peripheral communication device information table together with the reception time when the position information is received.

  Moreover, the vehicle-mounted communication control part 12 exists in the periphery of the vehicle by which the said vehicle-mounted communication apparatus 1 is mounted as vehicle-mounted communication apparatus input data 12g from the vehicle-mounted system outside the vehicle-mounted communication apparatus 1 (N-1). Information to be transmitted to any one of the in-vehicle communication devices 2, 3,..., N, for example, the in-vehicle communication device N, mounted on the peripheral vehicle via the in-vehicle communication device external connection unit 14 When receiving, the geographical position or area information regarding the in-vehicle communication device N specified as the communication destination from the in-vehicle system (for example, if the in-vehicle communication device N is an in-vehicle communication device existing near an intersection in the traveling direction, The geographical location information of the intersection) is output as the transmission destination position / area information 12c to the transmission destination determination unit 13, and the wireless transmission signal 11b in the case of transmitting information to the communication destination vehicle-mounted communication device N Sending To request a previous acquisition.

  The transmission destination determination unit 13 that has received the transmission destination acquisition request for transmitting the information for the communication destination vehicle communication device N as the wireless transmission signal 11b from the vehicle communication control unit 12 is periodically updated and held. Referring to the table, based on the position information of each in-vehicle communication device and the reception time at which the position information is received, whether the communication destination in-vehicle communication device N is an in-vehicle communication device capable of direct communication at the present time Judging.

  If the communication destination in-vehicle communication device N has been registered in the peripheral communication device information table more recently than when the predetermined time limit has been traced back, the transmission destination determination unit 13 determines that the communication destination in-vehicle communication device N It is judged that it is a case where information can be transmitted directly as a wireless transmission signal 11b, and the communication destination in-vehicle communication device N is selected as the transmission destination of the wireless transmission signal 11b, and the selected communication destination The in-vehicle communication device N is output to the requesting in-vehicle communication control unit 12 as the transmission destination setting signal 12d.

  On the other hand, even if the communication destination in-vehicle communication device N is not registered in the peripheral communication device information table, or is registered, the reception time of the position information related to the in-vehicle communication device N reaches a predetermined limit time. In the case of old information corresponding to a time earlier than the point in time, the transmission destination determination unit 13 may directly transmit information as a wireless transmission signal 11b to the communication destination vehicle-mounted communication device N. It is determined that this is not possible, and another in-vehicle communication device (or roadside communication device) that relays information to the in-vehicle communication device N as the communication destination is selected as the transmission destination of the wireless transmission signal 11b. As a result, the other in-vehicle communication device (or roadside communication device) selected for relaying information to the communication destination in-vehicle communication device N is sent to the requesting in-vehicle communication control unit 12 as the transmission destination setting signal 12d. Output.

  Here, when selecting another in-vehicle communication device (or roadside communication device) for relay, it is held in the peripheral communication device information table as an in-vehicle communication device that can communicate directly with the in-vehicle communication device 1 as the communication source. Location information and the reception time when the location information is received, and the geographical location or area relating to the destination in-vehicle communication device N input from the in-vehicle communication control unit 12 as the destination location / area information 12c Browse for information.

  As a result of referring to each of the in-vehicle communication devices set in the peripheral communication device information table assumed to be capable of direct communication, the in-vehicle communication device existing in the same direction as the communication destination in-vehicle communication device N (Or a roadside communication device) and another vehicle-mounted communication device that relays information for the communication destination vehicle-mounted communication device N to the vehicle-mounted communication device (or roadside communication device) having the latest reception time when receiving the position information. (Or roadside communication device) is extracted, and the extracted in-vehicle communication device (or roadside communication device) is selected as the transmission destination of the wireless transmission signal 11b.

  When the in-vehicle communication control unit 12 receives, as the transmission destination setting signal 12d, the information indicating the transmission destination when transmitting the information to the in-vehicle communication device N as the wireless transmission signal 11b, the received transmission destination The transmission data for transmitting information to the in-vehicle communication device N is edited and output to the in-vehicle wireless unit 11 as transmission data 12f.

  The in-vehicle wireless unit 11 that has received the transmission data 12f from the in-vehicle communication control unit 12 is a wireless device for a designated communication destination or relay in-vehicle communication device (or roadside communication device) as a transmission destination of information to the in-vehicle communication device N. It converts into a signal and transmits as the radio transmission signal 11b.

  In addition, as above-mentioned, the vehicle-mounted communication control part 12 carries out the vehicle-mounted communication apparatus periodically for the positional information of the own vehicle by which the vehicle-mounted communication apparatus 1 of the said vehicle-mounted communication control part 12 is mounted in the predetermined period. 1 is received as in-vehicle communication device input data 12g from the GPS which is one of the external in-vehicle systems via the in-vehicle communication device external connection unit 14, and is periodically output to the in-vehicle wireless unit 11 as transmission data 12f. doing.

  The in-vehicle wireless unit 11 that has received the position information of the own vehicle, that is, the own in-vehicle communication device 1 from the in-vehicle communication control unit 12 as the transmission data 12f, the position information of the own vehicle, that is, the own in-vehicle communication device 1, is mounted on the in-vehicle communication device 1. Converted to a radio signal broadcast to the in-vehicle communication devices 2, 3,..., N mounted on the (N-1) peripheral vehicles existing around the vehicle, as a radio transmission signal 11b, Broadcasts to in-vehicle communication devices 2, 3,. The same applies to the vehicle-mounted communication devices 2, 3,..., N mounted on the other (N-1) peripheral vehicles, and each vehicle, that is, the vehicle-mounted communication device, periodically with a predetermined cycle. 2, 3,... N position information is broadcast.

  As described above, when information is to be transferred to the communication destination using the road-to-vehicle and inter-vehicle communication system, the transmission destination determination unit 13 acquires the transmission destination of the wireless transmission signal 11b and acquires the acquired transmission. The operation of transmitting the wireless transmission signal 11b to the destination is performed, but when transmitting the position information of the own vehicle, that is, the in-vehicle communication device 1 as the wireless transmission signal 11b, the transmission destination determination unit 13 is not interposed. The wireless transmission signal 11b is broadcast to the in-vehicle communication device existing around the host vehicle.

  Next, an example of the operation of determining the transmission destination of the wireless transmission signal 11b in the transmission destination determination unit 13 will be described in more detail with reference to FIGS. FIG. 3 is an explanatory diagram illustrating an example of a communicable range in which the in-vehicle communication device 1 illustrated in FIG. 2 can perform direct communication, and the three in-vehicle communication devices 2, 3, and 4 are in a range in which direct communication is possible. The other vehicle-mounted communication devices after the vehicle-mounted communication device 5 exist outside the communicable range where direct communication cannot be performed. An example is shown. FIG. 4 is a table showing an example of a peripheral communication device information table in which information on peripheral vehicle communication devices that can be directly communicated with the vehicle communication device 1 shown in FIG. 2 is registered as peripheral communication device information. An example of setting in the peripheral communication device information table when there is a positional relationship as shown in FIG. 3 is shown.

  When the transmission destination determination unit 13 receives a transmission destination acquisition request from the in-vehicle communication control unit 12 when the in-vehicle communication device 1 tries to transmit information to any of the in-vehicle communication devices (or roadside communication devices), As shown in FIG. 2, among the in-vehicle communication devices 2, 3,..., N mounted on (N-1) peripheral vehicles existing around the vehicle on which the in-vehicle communication device 1 is mounted, From the peripheral communication device information table that is periodically updated as other in-vehicle communication devices (and roadside communication devices) that can directly communicate with the communication device 1, the in-vehicle communication device (or the communication destination specified this time) (or Roadside communication device: In the example of FIG. 3, only the information related to the in-vehicle communication device assumed to be related to the in-vehicle communication device 6) is extracted, and a table as shown in FIG. good.

  In the setting example shown in FIG. 4, a peripheral in-vehicle communication device that can directly communicate with the communication source in-vehicle communication device 1 as the latest position information 13a (current position information) is an in-vehicle communication device as shown in FIG. 3. 2, the case where it is three units, the vehicle-mounted communication apparatus 3 and the vehicle-mounted communication apparatus 4, is shown.

  That is, in FIG. 4, at the time T1 shown in the latest position information reception time 13b, it exists in the Position 1 shown in the latest position information 13a, and the in-vehicle communication device 1 of the host vehicle exists in a position where direct communication is possible. The in-vehicle communication devices (peripheral in-vehicle communication devices) mounted on the surrounding vehicles are positioned at the positions T2, T3, and T4 indicated by the latest position information reception time 13b, respectively, Position2, Position3, The example which is the vehicle-mounted communication apparatus 2, the vehicle-mounted communication apparatus 3, and the vehicle-mounted communication apparatus 4 which exist in Position4 is shown.

  As for the in-vehicle communication device 5, as shown in the latest position information reception time 13b, the vehicle-mounted communication device 1 was present at the position of the Position 5 where the in-vehicle communication device 1 can directly communicate at the time T5, but at the time T5. Is a time point that is further back than the predetermined time limit from the present time, and the expiration date has been exceeded. At this time, as shown in FIG. 3, the vehicle equipped with the in-vehicle communication device 5 is in-vehicle communication. It is assumed that there is a high possibility of moving out of the communicable range capable of directly communicating with the device 1 and moving out of the radio wave reachable range, and as shown in FIG.

  That is, the time T5 at which the position of Position 5 was recently received as the position information of the in-vehicle communication device 5 has passed a predetermined limit time and has expired. For this reason, as described above, the in-vehicle communication device 5 whose position information has not been received for a while after time T5 moves outside the communicable range where direct communication is possible, as shown in FIG. It is assumed that there is a high possibility that

  The peripheral communication device information table of FIG. 4 is received not only at the latest position information 13a and the latest position information reception time 13b indicating the time at which the latest position information was received, but also at the previous time. The previous position information 13c and the previous position information reception time 13d indicating the time when the previous position information was received are also set. Thereby, from the difference between the latest position information 13a and the previous position information 13c, and the difference between the latest position information reception time 13b and the previous position information reception time 13d, It is possible to grasp the traveling speed and the traveling direction.

  Therefore, whether or not each of the peripheral in-vehicle communication devices in FIG. 4 is mounted on a vehicle traveling in the same traveling direction as the vehicle on which the communication-source in-vehicle communication device 1 is mounted, Based on whether or not the vehicle is mounted on a vehicle having a small relative speed difference from the vehicle on which the communication source vehicle-mounted communication device 1 is mounted, the latest information is in a state in which communication with the vehicle-mounted communication device 1 can be performed directly. Even if it is, it is possible to determine whether or not it is a peripheral in-vehicle communication device that can be assumed to be a state that can continue to communicate directly with the in-vehicle communication device 1 in the future.

  However, as in the case of the in-vehicle communication device 2 in FIG. 4, the latest position information 13a exists in a range where communication with the in-vehicle communication device 1 can be performed directly, but as shown in the previous position information 13c, Until the previous time, there may be a case where the communication with the in-vehicle communication device 1 is not present in a range where it can be directly communicated. In such a case, at present, the traveling speed and traveling direction of the vehicle on which the in-vehicle communication device 2 is mounted cannot be grasped, and the travel speed is obtained by acquiring position information from the in-vehicle communication device 2 next time. , You will know the direction of travel.

  Here, as shown in FIG. 3, when the information is transmitted from the communication source in-vehicle communication device 1 to the communication destination in-vehicle communication device 6 as inter-vehicle communication, the transmission destination from the in-vehicle communication control unit 12 is transmitted. When the transmission destination acquisition request of the wireless transmission signal 11b for transmitting information to the in-vehicle communication device 6 as the communication destination is transmitted to the determination unit 13, the peripheral communication device information table shown in FIG. 4 is created. In the example, since the in-vehicle communication device 6 does not exist in a communicable range where direct communication from the in-vehicle communication device 1 is possible, relay transmission using another in-vehicle communication device (or roadside communication device) as a repeater is possible. It turns out that it is necessary.

  Therefore, the transmission destination determination unit 13 determines which of the in-vehicle communication device 2, the in-vehicle communication device 3, and the in-vehicle communication device 4 that can directly communicate as a candidate for the relay should be selected. This is determined with reference to the machine information table and the geographical position information or area information regarding the communication destination in-vehicle communication device 6 input as the transmission destination position / area information 12c from the in-vehicle communication control unit 12. First, in the peripheral communication device information table of FIG. 4, the in-vehicle communication device 2 existing in Position 2 is in a direction opposite to the geographical position of the communication destination in-vehicle communication device 6 as shown in FIG. 3. Therefore, it is excluded from the candidates for relay transmission for relay transmission to the in-vehicle communication device 6, or the priority as a candidate for relay is set low.

  In addition, as for the in-vehicle communication device 5 set in the peripheral communication device information table, as described above, the time T5 which is the position information reception time 13b has already expired, so the relay to the in-vehicle communication device 6 is performed. Excluded from transmission repeater candidates. However, the priority as a candidate for a relay for relay transmission to the in-vehicle communication device 6 may be lowered.

  Therefore, a candidate for a relay for communicating with the in-vehicle communication device 6 that is the communication destination is either the in-vehicle communication device 3 or the in-vehicle communication device 4. Here, referring to the position information reception time 13b of the peripheral in-vehicle communication device information table in FIG. 4, the time T3 when the latest position information Position3 of the in-vehicle communication device 3 is received and the latest position information Position4 of the in-vehicle communication device 4 are obtained. The received time T4 is compared. As a comparison result, for example, when the time T3 is closer to the current time than the time T4, the in-vehicle communication device 3 relays communication to the in-vehicle communication device 6 rather than the in-vehicle communication device 4. Therefore, the in-vehicle communication device 3 is determined as a repeater. Thereafter, a transmission destination setting signal 12d that uses the in-vehicle communication device 3 determined for relay as the transmission destination of the wireless transmission signal 11b is output to the in-vehicle communication control unit 12 that is the request source.

  As described above, when determining whether to select the in-vehicle communication device 3 or the in-vehicle communication device 4 as a relay in-vehicle communication device for the communication destination in-vehicle communication device 6, the in-vehicle communication device 3, By comparing the moving direction and moving speed of each of the in-vehicle communication devices 4 with the moving direction and moving speed of the in-vehicle communication device 1 as the communication source, the state in which direct communication with the in-vehicle communication device 1 as the communication source is possible at this time It may be determined whether or not the vehicle-mounted communication device is likely to continue, and the vehicle-mounted communication device for relay may be selected comprehensively including the determination result.

  For example, when the in-vehicle communication device 3 is moving in the same direction as the in-vehicle communication device 1 as the communication source and the moving speed difference is smaller than that of the in-vehicle communication device 4, the time when the latest position information Position3 is received. The in-vehicle communication device 3 having the newest T3 is selected as it is as an in-vehicle communication device for relaying information to the communication destination in-vehicle communication device 6.

  However, even if the moving direction of the in-vehicle communication device 3 is moving in the direction opposite to the in-vehicle communication device 1 that is the communication source or in the same direction, a predetermined threshold value is set in advance from the in-vehicle communication device 4. If the moving speed difference is larger than the time T3, even if the time T3 is closer to the current time than the time T4, the in-vehicle communication device 4 is more in-vehicle communication than the in-vehicle communication device 3. It is determined that there is a high possibility that the communication to the machine 6 can be relayed, and the time T3 at which the latest position information is received is changed from the latest in-vehicle communication apparatus 3, and the in-vehicle communication apparatus 4 is used as a repeater. It may be determined.

  When the in-vehicle communication control unit 12 receives, for example, the destination of the relay in-vehicle communication device 3 as the transmission destination setting signal 12d indicating the transmission destination of the wireless transmission signal 11b output from the transmission destination determination unit 13, the in-vehicle communication device 6 is edited as transmission data 12f with the in-vehicle communication device 3 for relay as a transmission destination, and is output to the in-vehicle wireless unit 11. The in-vehicle wireless unit 11 that has received the transmission data 12f from the in-vehicle communication control unit 12 converts the transmission data 12f in which information for the in-vehicle communication device 6 is edited with the in-vehicle communication device 3 for relay as a transmission destination into a radio signal. And transmitted as a wireless transmission signal 11b.

  The relay in-vehicle communication device 3 that has received the wireless transmission signal 11b from the in-vehicle communication device 1 recognizes that the received wireless reception signal is relay information for the in-vehicle communication device 6, and receives the received information. Is transferred to the in-vehicle communication device 6.

  In the peripheral in-vehicle communication device information table of the in-vehicle communication device 1 as shown in FIG. 4, the in-vehicle communication device 5 can currently be moved out of the communicable range where the in-vehicle communication device 1 can communicate directly. If it is assumed that there is a high probability, the destination determination unit 13 can lower the priority selected for relaying for direct communication and leave it as a candidate for the time being, as described above. For relaying information to the in-vehicle communication device 6 that is the communication destination, an operation to first select an in-vehicle communication device other than the in-vehicle communication device 5 is performed.

  However, for example, in the case of FIG. 4, both the in-vehicle communication device 3 and the in-vehicle communication device 4 that are candidates for relaying information to the in-vehicle communication device 6 are in the opposite direction to the in-vehicle communication device 1 that is the communication source. If the vehicle is moving and the positional relationship with the in-vehicle communication device 1 is likely to be reversed with respect to the communication destination in-vehicle communication device 6, it exists in the same direction as the communication destination in-vehicle communication device 6. An attempt may be made to select the in-vehicle communication device 5 that is highly likely to be used for relaying and transmit the wireless transmission signal 11b. In this attempt, when the arrival confirmation from the in-vehicle communication device 5 is not obtained, the in-vehicle communication capable of directly communicating with the in-vehicle communication device 1 even if it is located in the opposite direction to the communication destination in-vehicle communication device 6 For example, any one of the vehicle-mounted communication devices 2, 3, and 4 may be selected again.

  If the configuration and operation as described in detail above determines that communication with the in-vehicle communication device that is the communication destination cannot be performed directly in the inter-vehicle communication system, it exists in the vicinity of the in-vehicle communication device that is the communication source. Of the other in-vehicle communication devices, the in-vehicle communication device that is likely to be able to communicate directly is selected as the in-vehicle communication device for relay to the communication destination in-vehicle communication device, and the in-vehicle communication for the relay is selected. Information can be reliably and efficiently transmitted to the in-vehicle communication device as the communication destination via the communication device.

(Other embodiments of the present invention)
In the above-described embodiment, the description has focused on the inter-vehicle communication system. However, the same applies to the road-to-vehicle communication system that transmits and receives information between the in-vehicle communication device and the roadside communication device. The configuration of the road-to-vehicle and vehicle-to-vehicle communication systems that share the vehicle-to-vehicle communication and the vehicle-to-vehicle communication can operate in exactly the same way by replacing some of the plurality of in-vehicle communication devices with roadside communication devices.

  In other words, the vehicle described above can be used even when the in-vehicle communication device or roadside communication device of the communication source tries to transmit information to the roadside communication device or in-vehicle communication device of the communication destination that exists in an area where direct communication is not possible. Just as in the case of the inter-vehicle communication system, it is highly likely that direct communication is possible among other in-vehicle communication devices or roadside communication devices existing around the communication source in-vehicle communication device or roadside communication device. By selecting the communication device or the roadside communication device as the in-vehicle communication device or the roadside communication device for relay with respect to the communication destination roadside communication device or the in-vehicle communication device, the communication destination roadside communication device is surely and efficiently performed. Alternatively, information can be transmitted to the in-vehicle communication device.

  Furthermore, when a system sharing road-to-vehicle communication and vehicle-to-vehicle communication is used, the position information from the roadside communicator is received considering that the position information from the roadside communicator does not change with time. Regardless of the context of the reception time to receive the position information from other in-vehicle communication devices, that is, the position information reception time at which the position information from the roadside communication device has been received is Even if the time is earlier than the position information reception time when the position information was received from the communication device, the roadside communication device is used as a relay communication device in consideration of the moving direction and speed of the in-vehicle communication device that is the communication source. May be selected with priority.

  In addition, wireless communication signals for exchanging position information with each other in-vehicle communication devices, and communication destinations specified to realize a required communication service using road-to-vehicle and vehicle-to-vehicle communication systems. A wireless transmission / reception signal for transmitting information may be transmitted / received using the same wireless communication channel, or may be transmitted / received using different wireless communication channels. Furthermore, with respect to wireless communication systems such as DRSC (Dedicated Short Range Communication), IEEE802.11b / a / g, and other wireless communication systems such as Bluetooth (registered trademark), both of them have the same wireless communication system. You may make it share a communication apparatus, and you may make it each use the radio | wireless communication apparatus of a different radio | wireless communication system separately.

(Explanation of effect)
As described above, in each embodiment of the present invention, the in-vehicle communication device or the roadside communication device that is the communication source is mounted on another vehicle that exists in the vicinity within the range where direct communication is possible. Collecting position information (peripheral position information) periodically transmitted from the in-vehicle communication device or the roadside communication device installed on the roadside and the reception time (position information reception time) when the position information was received If you are trying to communicate with a vehicle in a location where radio waves do not reach directly, such as a vehicle around an intersection in the direction of travel, Even if the positional relationship of the vehicle changes frequently, the location information of the nearby in-vehicle communication devices and roadside communication devices managed adaptively, the reception time when the location information was received, and the communication destination exist To have a geographical location Can accurately select a relay vehicle-mounted communication device or roadside communication device using information about the area, so the wireless band can be efficiently used for the specified communication destination vehicle-mounted communication device or roadside communication device. It is possible to use and transmit information stably.

The configuration of the preferred embodiment of the present invention has been described above. However, it should be noted that such examples are merely illustrative of the invention and do not limit the invention in any way. Those skilled in the art will readily understand that various modifications and changes can be made according to a specific application without departing from the gist of the present invention. For example, the embodiment of the present invention can be expressed as the following configuration in addition to the configuration (1) in the means for solving the problems.
(2) When it is determined that the communication destination vehicle-mounted communication device or roadside communication device does not exist within a range where the communication source vehicle-mounted communication device or roadside communication device can directly communicate, the communication destination vehicle-mounted communication Based on the information indicating the geographical position or area where the machine or roadside communication device is present, the peripheral position information registered and registered in the peripheral communication device information table, and the position information reception time. Select the vehicle-mounted communication device or roadside communication device that relays the information for the vehicle-mounted communication device or roadside communication device from among the vehicle-mounted communication device or roadside communication device that is set and registered in the latest peripheral communication device information table, The information for the communication destination in-vehicle communication device or roadside communication device is edited and transmitted to a radio signal having the in-vehicle communication device or roadside communication device selected for relay as a transmission destination for relay (1) Road-to-vehicle and vehicle-to-vehicle communication system.
(3) Information indicating a geographical position or area where the in-vehicle communication device or roadside communication device of the communication destination exists, and the peripheral position information and the position information received and registered latest in the peripheral communication device information table When selecting an in-vehicle communication device or roadside communication device for relay based on the time of day, it exists in the same direction as the information indicating the geographical location or area where the communication destination in-vehicle communication device or roadside communication device exists In addition, the road-to-vehicle and vehicle-to-vehicle communication system according to (2), wherein the vehicle-mounted communication device or roadside communication device having the latest position information reception time is selected from the peripheral communication device information table.
(4) Information indicating a geographical position or area where the in-vehicle communication device or roadside communication device of the communication destination is present, and the peripheral position information and the position information received and registered latest in the peripheral communication device information table When selecting an in-vehicle communication device or roadside communication device for relay based on the time, the moving direction and movement of the in-vehicle communication device or roadside communication device that is set and registered in the latest in the peripheral communication device information table (2) or determining the necessity of change of the relay onboard communication device or roadside communication device to be selected by calculating the speed and referring to the calculated moving direction and moving speed of the onboard communication device or roadside communication device (3) Road-to-vehicle and vehicle-to-vehicle communication system.
(5) Information indicating a geographical position or area where the in-vehicle communication device or roadside communication device of the communication destination is present, and the peripheral position information and the position information received and registered latest in the peripheral communication device information table When selecting an in-vehicle communication device or roadside communication device for relay based on the time, among the in-vehicle communication device or roadside communication device that is most recently set and registered in the peripheral communication device information table, the communication destination In-vehicle communication device or roadside communication device located on the opposite side of the in-vehicle communication device or roadside communication device, and / or in-vehicle corresponding to a time before the time when the position information reception time goes back a predetermined limit time Exclude the communication device or roadside communication device from the candidate for in-vehicle communication device or roadside communication device for relay, or priority as the candidate for in-vehicle communication device or roadside communication device for relay One of the road-vehicle and inter-vehicle communication system of the above (2) to lower the position (4).
(6) Information indicating a geographical position or area where the in-vehicle communication device or roadside communication device of the communication destination is present, and the peripheral position information and the position information received that are latest set and registered in the peripheral communication device information table When selecting an in-vehicle communication device or roadside communication device for relay based on the time, among the in-vehicle communication devices or roadside communication devices registered and registered in the peripheral communication device information table, the roadside communication device is selected. The road-to-vehicle and vehicle-to-vehicle communication system according to any one of the above (2) to (5), wherein a higher priority is set as a relay candidate than an in-vehicle communication device.
(7) A wireless signal for transmitting position information of the in-vehicle communication device and the roadside communication device at a predetermined cycle and information for transmitting information to the specified in-vehicle communication device or roadside communication device. The road-to-vehicle and vehicle-to-vehicle communication system according to any one of (1) to (6), wherein a wireless signal for transmission is transmitted using the same wireless communication channel.
(8) A wireless signal for transmitting position information of the in-vehicle communication device and the roadside communication device and information for transmitting information to the specified in-vehicle communication device or roadside communication device in a predetermined cycle. The road-to-vehicle and vehicle-to-vehicle communication system according to any one of (1) to (6), wherein a wireless signal for transmission is transmitted using different wireless communication channels.
(9) A wireless signal for transmitting position information of the in-vehicle communication device and the roadside communication device and information for transmitting information to the specified in-vehicle communication device or roadside communication device at a predetermined cycle. The road-to-vehicle and vehicle-to-vehicle communication system according to any one of (1) to (8), wherein a wireless signal for transmission is transmitted using the same wireless communication system.
(10) A radio signal for transmitting position information of the in-vehicle communication device and the roadside communication device at a predetermined cycle and information for transmitting information to the specified in-vehicle communication device or roadside communication device. The road-to-vehicle and vehicle-to-vehicle communication system according to any one of (1) to (8), wherein a wireless signal to be transmitted is transmitted using a different wireless communication method.
(11) In road-to-vehicle and vehicle-to-vehicle communication methods for communication between in-vehicle communication devices and / or between in-vehicle communication devices and roadside communication devices, each in-vehicle communication device and roadside communication device are The position information of the in-vehicle communication device and the own road side communication device is transmitted as a radio signal, and the surrounding in-vehicle communication device and the roadside communication device transmit the wireless signal having the position information of each in-vehicle communication device and the roadside communication device to the peripheral position information. The peripheral position information is set and registered in the peripheral communication device information table together with the position information reception time when the peripheral position information was received, and the communication source vehicle-mounted communication device or roadside communication device specified When trying to transmit information to a communication destination in-vehicle communication device or roadside communication device, each of the in-vehicle communication device and the roadside communication device registered and registered in the peripheral communication device information table is the latest. Whether the communication destination vehicle-mounted communication device or roadside communication device is within a range where the communication source vehicle-mounted communication device or roadside communication device can directly communicate based on side position information and the position information reception time Road-to-vehicle and vehicle-to-vehicle communication method for determining whether or not.
(12) If it is determined that the communication destination vehicle-mounted communication device or roadside communication device does not exist within a range where the communication source vehicle-mounted communication device or roadside communication device can directly communicate, the communication destination vehicle-mounted communication Based on the information indicating the geographical position or area where the machine or roadside communication device is present, the peripheral position information registered and registered in the peripheral communication device information table, and the position information reception time. Select the vehicle-mounted communication device or roadside communication device that relays the information for the vehicle-mounted communication device or roadside communication device from among the vehicle-mounted communication device or roadside communication device that is set and registered in the latest peripheral communication device information table, The information for the in-vehicle communication device or roadside communication device of the communication source is edited and transmitted to a radio signal having the in-vehicle communication device or roadside communication device selected for relay as a transmission destination for relay (1) Road-to-vehicle and inter-vehicle communication method).
(13) Information indicating a geographical position or area where the in-vehicle communication device or roadside communication device of the communication destination exists, and the peripheral position information and the position information received and registered latest in the peripheral communication device information table When selecting an in-vehicle communication device or roadside communication device for relay based on the time of day, it exists in the same direction as the information indicating the geographical location or area where the communication destination in-vehicle communication device or roadside communication device exists And the road-to-vehicle and vehicle-to-vehicle communication method according to (12), wherein the vehicle-mounted communication device or roadside communication device having the latest position information reception time is selected from the peripheral communication device information table.
(14) Information indicating a geographical position or area where the in-vehicle communication device or roadside communication device of the communication destination exists, and the peripheral position information and the position information received that are latest set and registered in the peripheral communication device information table When selecting an in-vehicle communication device or roadside communication device for relay based on the time, the moving direction and movement of the in-vehicle communication device or roadside communication device that is set and registered in the latest in the peripheral communication device information table The above (12) or determining whether or not it is necessary to change the relay in-vehicle communication device or roadside communication device to be selected by calculating the speed and referring to the calculated moving direction and moving speed of the in-vehicle communication device or roadside communication device (13) Road-to-vehicle and vehicle-to-vehicle communication method.
(15) Information indicating a geographical position or area where the in-vehicle communication device or roadside communication device of the communication destination is present, and the peripheral position information and the position information received that are latest set and registered in the peripheral communication device information table When selecting an in-vehicle communication device or roadside communication device for relay based on the time, among the in-vehicle communication device or roadside communication device that is most recently set and registered in the peripheral communication device information table, the communication destination In-vehicle communication device or roadside communication device located on the opposite side of the in-vehicle communication device or roadside communication device, and / or in-vehicle corresponding to a time before the time when the position information reception time goes back a predetermined limit time Either exclude the communication device or the roadside communication device from the candidates for the in-vehicle communication device or roadside communication device for relay, or preferentially as the candidate for the in-vehicle communication device or roadside communication device for relaying. One of the road-vehicle and inter-vehicle communication method of the above (12) to demote (14).
(16) Information indicating a geographical position or area where the in-vehicle communication device or roadside communication device of the communication destination is present, and the peripheral position information and the position information received that are latest set and registered in the peripheral communication device information table When selecting an in-vehicle communication device or roadside communication device for relay based on the time, among the in-vehicle communication devices or roadside communication devices registered and registered in the peripheral communication device information table, the roadside communication device is selected. The road-to-vehicle and vehicle-to-vehicle communication method according to any one of the above (12) to (15), wherein a higher priority is set as a relay candidate than an in-vehicle communication device.
(17) A road-to-vehicle and vehicle-to-vehicle communication program that implements the road-to-vehicle and vehicle-to-vehicle communication method according to any one of (11) to (16) as a program executable by a computer.
(18) A program recording medium in which the road-to-vehicle and vehicle-to-vehicle communication program of (17) is recorded on a computer-readable recording medium.

DESCRIPTION OF SYMBOLS 1 In-vehicle communication apparatus 2 In-vehicle communication apparatus 3 In-vehicle communication apparatus 4 In-vehicle communication apparatus 5 In-vehicle communication apparatus 6 In-vehicle communication apparatus N In-vehicle communication apparatus 11 In-vehicle wireless part 11a Wireless reception signal 11b Wireless transmission signal 12 In-vehicle communication control part 12a Surrounding vehicle position information 12b Position information reception time 12c Transmission destination position / area information 12d Transmission destination setting signal 12e Reception data 12f Transmission data 12g In-vehicle communication device input data 12h In-vehicle communication device output data 13 Transmission destination determination unit 13a Latest position information 13b Latest position information Reception time 13c Previous position information 13b Previous position information reception time 14 In-vehicle communication device external connection unit 21 In-vehicle wireless unit 22 In-vehicle communication control unit 23 Destination determination unit 24 In-vehicle communication device external connection unit

Claims (13)

In road-to-vehicle and vehicle-to-vehicle communication systems that perform communication between in-vehicle communication devices and / or between in-vehicle communication devices and roadside communication devices,
Each in-vehicle communication device
Send a wireless signal containing the location information of the in-vehicle communication device ,
Receiving radio signals including each position information from the surrounding in-vehicle communication devices and roadside communication devices,
Register the location information of the received in-vehicle communication devices and roadside communication devices with the time as a peripheral communication device information table,
When the in-vehicle communication device of the communication source transmits a wireless signal to transmit information to the specified in-vehicle communication device or roadside communication device,
Based on the surrounding communication device information table, the communication destination of the vehicle communication device or roadside communication device may determine whether or not present in the communication source of the vehicle-mounted communication device directly from the communication range,
When it is determined that the in-vehicle communication device or roadside communication device of the communication destination does not exist within a range in which direct communication is possible, the in- vehicle communication device of the communication destination out of the in-vehicle communication devices registered in the peripheral communication device information table In-vehicle communication device located in a direction opposite to the geographical position or area where the communication device or road-side communication device exists and the direction from the communication source in-vehicle communication device to the communication destination in-vehicle communication device or road-side communication device Are excluded from candidates to be selected as in-vehicle communication devices for relay,
Compared with the moving direction and the moving speed of the remaining vehicle communication device as a candidate for selection as a vehicle communication device for relaying, a moving direction and moving speed of the communication source of the vehicle-mounted communication apparatus, the vehicle-mounted communication device for the relay Select the in- vehicle communication device for relay based on the position information of the communication device of the communication destination from among the in- vehicle communication devices remaining as candidates to select,
A road-to-vehicle and vehicle-to-vehicle communication system, wherein information for the communication destination in-vehicle communication device or roadside communication device is transmitted to a vehicle-mounted communication device selected for relay as a transmission destination for relay. When selecting an in-vehicle communication device for relay,
Furthermore, the out-vehicle communication device registered in the surrounding communication device information table, existing set of in-vehicle communication in the same way direction as geographical location or area is present in the communication destination of the vehicle-mounted communication device or roadside communication device road-to-vehicle and inter-vehicle communication system according to claim 1 which machine a, and selects as a vehicle communication device for relaying. When selecting an in-vehicle communication device for relay,
Furthermore, the movement speed difference between the movement speed of each in-vehicle communication device registered in the peripheral communication device information table and the movement speed of the communication source in-vehicle communication device is calculated,
It is determined whether or not the moving direction of each in-vehicle communication device registered in the peripheral communication device information table and the moving direction of the communication source in-vehicle communication device are the same direction,
To claim 1 or 2, characterized by selecting a vehicle communication device for relaying from the vehicle communication device registered in the surrounding communication device information table on the basis of the moving direction of the determination result and the moving speed difference The road-to-vehicle and vehicle-to-vehicle communication system described. When selecting an in-vehicle communication device for relay,
Moreover, the are moving in the communication source in-vehicle communication device in the same direction, and the remaining when the low moving speed difference than vehicle communication device, the peripheral of the time the most recent vehicle communication device as another candidate 4. The road-to-vehicle and vehicle-to-vehicle communication system according to claim 3 , wherein the communication device information table is selected from the communication device information table. When selecting an in-vehicle communication device for relay,
The vehicle communication device the time corresponding to the addition before time than the timing predated the limit time a predetermined, according to any one of 請 Motomeko 1 to 4 to exclude from the in-vehicle communication device candidate relay Road-to-vehicle and vehicle-to-vehicle communication systems. The same wireless communication between the wireless signal for transmitting the position information of the own vehicle-mounted communication device and the wireless signal for transmitting information for transmitting information to the specified communication destination vehicle-mounted communication device or roadside communication device The road-to-vehicle and vehicle-to-vehicle communication system according to any one of claims 1 to 5, wherein transmission is performed using a channel. A wireless signal for transmitting position information of the own vehicle-mounted communication device and a wireless signal for transmitting information for transmitting information to the specified communication destination vehicle-mounted communication device or roadside communication device are different from each other. The road-to-vehicle and vehicle-to-vehicle communication system according to any one of claims 1 to 5, wherein transmission is performed using a channel. The same wireless communication between the wireless signal for transmitting the position information of the own vehicle-mounted communication device and the wireless signal for transmitting information for transmitting information to the specified communication destination vehicle-mounted communication device or roadside communication device The road-to-vehicle and vehicle-to-vehicle communication system according to any one of claims 1 to 7, wherein transmission is performed using a method. A wireless signal for transmitting position information of the own vehicle-mounted communication device and a wireless signal for transmitting information for transmitting information to the specified communication destination vehicle-mounted communication device or roadside communication device are different from each other. The road-to-vehicle and vehicle-to-vehicle communication system according to any one of claims 1 to 7, wherein transmission is performed using a method. In road-to-vehicle and vehicle-to-vehicle communication methods for communicating between in-vehicle communication devices and / or between in-vehicle communication devices and roadside communication devices,
Each in-vehicle communication device
Send a wireless signal containing the location information of the in-vehicle communication device ,
Receiving radio signals including each position information from the surrounding in-vehicle communication devices and roadside communication devices,
Register the location information of the received in-vehicle communication devices and roadside communication devices with the time as a peripheral communication device information table,
When the in-vehicle communication device of the communication source transmits a wireless signal to transmit information to the specified in-vehicle communication device or roadside communication device,
Based on the surrounding communication device information table, the communication destination of the vehicle communication device or roadside communication device may determine whether or not present in the communication source of the vehicle-mounted communication device directly from the communication range,
When it is determined that the in-vehicle communication device or roadside communication device of the communication destination does not exist within a range in which direct communication is possible, the in- vehicle communication device of the communication destination out of the in-vehicle communication devices registered in the peripheral communication device information table In-vehicle communication device located in a direction opposite to the geographical position or area where the communication device or road-side communication device exists and the direction from the communication source in-vehicle communication device to the communication destination in-vehicle communication device or road-side communication device Are excluded from candidates to be selected as in-vehicle communication devices for relay,
Compared with the moving direction and the moving speed of the remaining vehicle communication device as a candidate for selection as a vehicle communication device for relaying, a moving direction and moving speed of the communication source of the vehicle-mounted communication apparatus, the vehicle-mounted communication device for the relay Select the in- vehicle communication device for relay based on the position information of the communication device of the communication destination from among the in- vehicle communication devices remaining as candidates to select,
A road-to-vehicle and vehicle-to-vehicle communication method, characterized in that information for the in-vehicle communication device or roadside communication device of the communication destination is transmitted as a transmission destination to the in-vehicle communication device selected for relay. The road-to-vehicle and vehicle-to-vehicle communication method according to claim 10 is implemented as a program executable by a computer. 12. A program recording medium in which the road-to-vehicle and vehicle-to-vehicle communication program according to claim 11 is recorded in a computer-readable recording medium. In mounted on vehicles IVC and / or communication device that performs road-vehicle communication,
The communication device transmits position information of its own device, position information transmission means;
Transmission information transmitting means for transmitting information to be transmitted to the set communication device;
Receiving means for receiving each position information from a communication device existing around the own device;
Transmission information receiving means for receiving information transmitted as a communication destination by the own device;
Registration means for registering the received location information of the peripheral communication device together with the time as a peripheral communication device information table;
Whether or not the communication device of the communication destination is within a range in which the communication device of the communication device can communicate directly with the communication device of the own device when transmitting a wireless signal to transmit information from the transmission means to the communication device of the communication destination Determination means for determining whether or not
When transmitting a radio signal attempts to transmit information to the communication destination of the communication unit from the transmission information transmitting means, said determining means that can communicate directly from the own communication device of the communication destination of the communication device is passed Xinyuan If it is determined whether or not it exists within the range, and it is determined that the communication device of the transmission destination does not exist within the range where direct communication is possible, the peripheral vehicle registered in the peripheral communication device information table Among the installed communication devices, the communication device is located in a direction opposite to a geographical position or area where the communication device of the communication destination exists and a direction from the communication device itself to the communication device of the communication destination. Exclude the communicator from the candidate to select as a relay communicator,
Candidate to select as the communication device for relay by comparing the moving direction and moving speed of the remaining communication device as a candidate to be selected as a relay communication device with the moving direction and movement speed of the communication device's own communication device A communication device for relay is selected from the remaining communication devices based on position information of the communication device of the communication destination.

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