JP4179059B2 - Vehicle-to-vehicle communication device and vehicle-to-vehicle communication program - Google Patents

Vehicle-to-vehicle communication device and vehicle-to-vehicle communication program Download PDF

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Publication number
JP4179059B2
JP4179059B2 JP2003159193A JP2003159193A JP4179059B2 JP 4179059 B2 JP4179059 B2 JP 4179059B2 JP 2003159193 A JP2003159193 A JP 2003159193A JP 2003159193 A JP2003159193 A JP 2003159193A JP 4179059 B2 JP4179059 B2 JP 4179059B2
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Japan
Prior art keywords
vehicle
information
transmission
pattern
receiving
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JP2004363877A (en
Inventor
卓夫 石若
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日産自動車株式会社
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Description

[0001]
【Technical field】
The present invention is an inter-vehicle communication device mounted on a vehicle and capable of transmitting and receiving information to and from other vehicles, and can collect information quickly and efficiently using two different transmission patterns. The present invention relates to a vehicle-to-vehicle communication device, a vehicle-to-vehicle communication program, and a vehicle-to-vehicle communication method.
[0002]
[Background]
There is an inter-vehicle communication device that transmits information using a transmission pattern based on the position of a vehicle (see Patent Document 1). The inter-vehicle communication device selects a transmission pattern that differs for each position based on the vehicle position or future position detected by the transmission side, and transmits information according to the selected transmission pattern. In the prior art described in Patent Literature 1, a number sequence for spread spectrum is determined by adding a number representing position information to a PN code in spread spectrum communication and a number sequence corresponding to a vehicle ID to the number sequence of position information.
[0003]
However, since the receiving side does not know the vehicle ID of the transmitting side, a PN code combining all vehicle IDs must be generated for the portion corresponding to the vehicle ID, and there is actually no information in many cases. There is a problem that it takes a long processing time to acquire the target information. That is, with the conventional method, a communication link with a specific target vehicle cannot be quickly established.
[0004]
[Prior art]
[Patent Document 1]
JP 2000-269886 A
[0005]
DISCLOSURE OF THE INVENTION
An object of the present invention is to quickly transmit / receive necessary information to / from a specific vehicle by transmitting / receiving information including a vehicle ID in advance using the same communication protocol associated with position information. In particular, an object of the present invention is to provide an inter-vehicle communication device in which information to be acquired is suitable for driving support, accident prevention support, emergency vehicle operation support, and the like.
[0006]
According to the present invention, a vehicle-to-vehicle communication device capable of transmitting and receiving information to and from other vehicles,
First transmission pattern determination means for determining a first transmission pattern in accordance with the detected position of the host vehicle, and first information including at least a vehicle ID in the first transmission pattern determined by the first transmission pattern determination means. Determined by the first transmission means for transmitting the information to the outside, the second transmission pattern determination means for determining the second transmission pattern according to the vehicle ID included in the first information, and the second transmission pattern determination means The vehicle-to-vehicle communication device and the vehicle-to-vehicle communication program having the second transmission pattern for transmitting the second information to the outside can be provided.
As a result, in the receiving vehicle, the first receiving pattern determining means for determining the first receiving pattern according to the detection target area, and the first receiving pattern determined by the first receiving pattern determining means, the transmission source vehicle A first receiving means for receiving first information including at least an ID; a second receiving pattern determining means for determining a second receiving pattern according to a vehicle ID extracted from the first information; and the second receiving pattern determining means. By using the inter-vehicle communication device having the second receiving means for receiving the second information with the second receiving pattern determined by the above, it is possible to efficiently obtain necessary information from the surrounding vehicle according to the position of the own vehicle. can do.
[0007]
DETAILED DESCRIPTION OF THE INVENTION
[First Embodiment]
DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, a first embodiment of the invention will be described with reference to the drawings.
The inter-vehicle communication device 10 (not shown) of the present embodiment includes a transmission device 100 and a reception device 200. In addition, a vehicle status detection unit 1 and a database 2 that can be accessed by the transmission device 100 and the reception device 200 are provided.
[0008]
In this embodiment, an information communication network is established between the own vehicle and one or more other vehicles using a spread spectrum communication system. The spread spectrum communication system is a system that spreads the frequency bandwidth of a carrier wave carrying a digital signal (baseband signal) that forms information using a PN code (Pseudo Noise) and spreads it over a wider frequency bandwidth. is there. In the present embodiment, it is possible to use a spread spectrum system used for CDMA communication used for mobile phones, IEEE802.11 used for wireless LAN, Bluetooth for short-range wireless standards, and the like. As a method for spreading the frequency bandwidth, a direct spreading method (Direct Sequence) or a frequency hopping method (Frequency Hopping) can be used.
[0009]
On the sending side Leave The baseband signal spread using the PN code is despread (restored) using the same PN code on the receiving side. That is, the transmission side performs processing for placing the baseband signal on the carrier wave and processing for spreading the spectrum over a wide band by multiplying the modulated signal by the PN code. The receiving side performs processing reverse to that of the transmitting side, demodulates the received signal, and reproduces the original baseband signal. Hereinafter, the transmission device 100 as an example of the transmission side and the reception device 200 as an example of the reception side will be described. “Communication” includes “transmission” and “reception”.
[0010]
<Transmitter>
FIG. 1 shows the configuration of the transmission device 100.
The transmission apparatus 100 includes first transmission pattern determination means 11, first transmission means 12, second transmission pattern determination means 13, and second transmission means 14. Specifically, a first transmission pattern is determined according to at least the detected position of the host vehicle, and a program for controlling transmission of information based on the determined first transmission pattern and a second according to the vehicle ID. By determining a transmission pattern, a ROM storing a program for controlling transmission of information based on the determined second transmission pattern, and executing a program stored in the ROM, the first transmission pattern determination means 11, A CPU that functions as the first transmission unit 12, the second transmission pattern determination unit 13, and the second transmission unit 14, and a RAM that functions as the database 2 or a RAM that stores information acquired from the database 2 are provided.
[0011]
The “first transmission pattern determining means 11” determines the first transmission pattern according to the position of the host vehicle. The first transmission pattern determination unit 11 includes a host vehicle position information acquisition unit 111, a specific area detection unit 112, a position comparison unit 113, and a first pattern determination unit 114. Here, an example in which the specific area detection unit 112 and the position comparison unit 113 are not activated will be described. When these are activated, the same operation as the specific area detection unit 212 and the position comparison unit 213 described in the receiving apparatus 200 is performed. When the vehicle is located in a specific area, when entering the specific area, it is used when starting communication processing.
[0012]
The “own vehicle position information acquisition unit 111” acquires vehicle status information including at least the position of the own vehicle. The vehicle status includes not only the position of the host vehicle but also the traveling direction of the host vehicle and the traveling speed of the host vehicle. The vehicle situation is detected by the vehicle situation detection means 1. Specifically, the position of the host vehicle is detected by the host vehicle position detection unit 1. The own vehicle position detection unit 1 detects the position of the own vehicle using a GPS (Global Positioning System) function, a gyro sensor, and a distance measuring sensor. The traveling direction is detected by a traveling direction detection unit. The travel speed is detected by a travel speed detector.
[0013]
The “first pattern determination unit 114” determines the first transmission pattern according to the detected position of the host vehicle. For example, the first pattern determination unit 114 obtains a number sequence by synthesizing the position coordinates of the host vehicle as a position of the host vehicle by a predetermined method, and generates a PN code by a predetermined method using the number sequence. To do. The first transmission pattern is determined as performing spread spectrum communication using this PN code. Specifically, based on the detected latitude / longitude information of the host vehicle, a round number is synthesized in an appropriate unit (1 km unit, 0.5 km unit) or the like, and a series of numbers is created. Then, a PN code is created for the created number sequence by a predetermined process, and a spread spectrum technique using the PN code is determined as a first transmission pattern. The determined first transmission pattern is sent to the first transmission means 12.
[0014]
The “first transmission unit 12” is a first transmission pattern determined by the first transmission pattern determination unit, and transmits the first information including at least the vehicle ID to the outside. The first transmission unit 12 includes a first information generation unit 121, a first transmission control unit 122, and a first transmission unit 123.
[0015]
The 1st information generation part 121 is provided with the information acquisition function acquired from vehicle situation detection means 1, and the ID generation function which determines vehicle ID. The vehicle ID is a value of about 4 digits, for example, and is kept at the same value until it is randomly generated and the engine is stopped after the engine is started. In addition to the vehicle ID, the first information may include information indicating the status of the host vehicle such as the host vehicle position, the travel direction, and the travel speed.
[0016]
The first information generation unit 121 generates first information including at least the vehicle ID based on the first pattern determined by the first pattern determination unit 114. Although not particularly limited, the first information of the present embodiment performs spread spectrum using the first modulation that puts information including unmodulated vehicle ID on a carrier wave and the PN code acquired by the first pattern determination unit 114. Obtained through second modulation.
[0017]
The first transmission control unit 122 determines the timing for transmitting the first information generated by the first information generation unit 121, and transmits a control command to the first transmission unit 123. And the 1st transmission part 123 sends out the 1st information outside according to the control command of the 1st transmission control part 122.
[0018]
The “second transmission pattern determination unit 13” determines the second transmission pattern according to the vehicle ID included in the first information. The 2nd transmission pattern determination means 13 has the vehicle ID acquisition part 131 which acquires vehicle ID, and the 2nd pattern determination part 132 which determines a 2nd pattern.
[0019]
The “vehicle ID acquisition unit 131” acquires the vehicle ID generated by the first information generation unit 121.
[0020]
The “second pattern determining unit 132” determines the second transmission pattern according to the acquired vehicle ID. For example, the second pattern determination unit 132 combines a number sequence using the vehicle ID by a predetermined method, and determines a second transmission pattern using the number sequence as a PN code. The determined second transmission pattern is sent to the second transmission means 14. The vehicle ID used for determining the second transmission pattern is associated with the vehicle ID of the host vehicle included in the first information.
[0021]
The “second transmission unit 14” sends the second information outward with the transmission pattern determined by the second transmission pattern determination unit 13. The second transmission unit 14 includes a second information generation unit 141, a second transmission control unit 142, and a second transmission unit 143.
[0022]
The “second information generation unit 141” is an information acquisition function for acquiring information included in the second information from the vehicle state detection means 1. The Have. The second information generation unit 141 generates second information including the vehicle status based on the second pattern determined by the second pattern determination unit 132. The second information includes information different from the first information. Specifically, the second information includes detailed information indicating the state of the host vehicle such as the host vehicle position, the traveling direction, and the traveling speed. Although not particularly limited, the second information of the present embodiment is obtained by performing spread spectrum using the first modulation that puts information including the state of the unmodulated vehicle on the carrier wave and the PN code acquired by the second pattern determination unit 132. Obtained through the second modulation performed.
[0023]
The second transmission control unit 142 determines the timing for transmitting the second information generated by the second information generation unit 141, and transmits a control command to the second transmission unit 143. The second transmission unit 143 sends the second information to the outside according to the control command of the second transmission control unit 142.
[0024]
The control procedure of the transmission apparatus 100 will be described based on the flowchart shown in FIG.
[0025]
Processing is started in response to the start of the engine of the vehicle (S1001). The time counter T of the vehicle position information acquisition unit 111 is reset (S1003). The time counter T measures the timing for determining the cycle for acquiring the vehicle status such as the vehicle position (cycle for updating the vehicle status information). According to a predefined acquisition cycle (Th), the vehicle status such as the vehicle position is automatically acquired. The vehicle position L is detected by the vehicle state detection means 1 A The traveling direction, the traveling speed, and other vehicle conditions are detected (S1005). In this embodiment, the own vehicle position information acquisition unit 111 is configured to display the current position information L A To get.
[0026]
The first pattern determination unit 114 determines the position L of the host vehicle. A Accordingly, the first transmission pattern is determined (S1007). Here, a PN code is created as the first transmission pattern, and the contents of the spread spectrum processing performed using this PN code sequence will be described. A series of number sequences is created by a predetermined method from latitude / longitude information (position information) of the host vehicle detected first, and a PN code is created by a predetermined method based on the obtained number sequence. A transmission pattern PA for spread spectrum processing using the created PN code is determined. In other words, primary modulation is performed by placing a baseband signal such as a vehicle ID on a narrow-band carrier (carrier wave), and the modulated signal (spectrum) is multiplied by a PN code (Pseudo Noise, pseudorandom pattern) and spread. The method is determined as the first transmission pattern PA.
[0027]
The first information generation unit 121 of the first transmission unit 12 generates first information according to the first pattern selected by the first pattern determination unit 114 (S1008). The information included in the first information is illustrated in FIG. The first information in this example includes at least a vehicle ID. In addition to this information, time information for transmitting the second information may be transmitted. In this way, on the receiving side, it becomes an indication of timing for starting the reception processing of the second information, and accurate reception becomes possible. Further, the position, speed, and direction may be included. In this way, it is possible to select information to be acquired by specifying the vehicle ID.
[0028]
After the generation of the first information, the information communication state of the vehicle located in the specific area is monitored (S1015). Specifically, the first transmission pattern P A A signal transmitted from the surroundings is received for a certain period of time, and it is determined whether or not there is a free communication channel (S1017). If there is a communication channel available, the first transmission pattern P A The first information about the host vehicle is transmitted using (S1020). If there is no available communication channel, the process waits for a random time (S1019) and returns to step 1013 to be described later.
[0029]
The transmission of the second information is performed at a timing different from the transmission of the first information (S1003 to S1020). That is, the first information is transmitted at a timing that is adjusted with the transmission timing of the vehicle located in the same area, but the second information is transmitted at a constant cycle (timing) for each vehicle.
[0030]
The second information transmission process may be started after the first transmission pattern is determined (S1007), or may be performed independently of the first information transmission process (S1003 to S1020). It is determined whether it is time to transmit the second information (S1009). Whether or not it is the timing of the second information transmission is determined based on a preset period. If it is the timing of the second information transmission, the second transmission means 14 acquires the second transmission pattern QA determined by the second pattern determination unit 132 (S1010). Specifically, it is a number sequence associated with the acquired vehicle ID, and spectrum spreading is performed using a PN code by a method predetermined from the number sequence of the vehicle ID. This method is determined as the second transmission pattern.
[0031]
The 2nd information generation part 141 of the 2nd transmission means 14 produces | generates 2nd information using a 2nd pattern (S1011). The information included in the second information is illustrated in FIG. The second information in this example includes detailed information to be transmitted to other vehicles, for example, the position of the vehicle, the speed of the vehicle, the traveling direction of the vehicle, and the like. The second transmission unit 143 outputs the second information in accordance with the control command output from the second transmission control unit 142 (S1012).
[0032]
In step 1013, progress of the processing time is monitored. When the time counter T exceeds the predetermined time Th, the process returns to step 1003 to detect the vehicle state such as the vehicle position again. When the time counter T does not exceed the predetermined time Th, the process proceeds to step 1015 described above.
[0033]
<Receiving device>
The receiving apparatus 200 includes a first reception pattern determination unit 21, a first reception unit 22, a second reception pattern determination unit 23, and a second reception unit 24. Specifically, a first reception pattern is determined according to at least a detection target area, a program for controlling transmission of information based on the determined first reception pattern, and a second reception pattern is determined according to a vehicle ID. Then, a ROM that stores a program for controlling transmission of information based on the determined second reception pattern, and a first reception pattern determination unit 21 and a first reception unit 22 are executed by executing the program stored in the ROM. , A CPU that functions as the second reception pattern determination means 23 and the second reception means 24, and a RAM that functions as the database 2 or a RAM that stores information acquired from the database 2. It should be noted that the detection target area described here refers to an area in which the host vehicle wishes to acquire the presence of other vehicles and information on the vehicles.
[0034]
The “first reception pattern determination unit 21” includes a host vehicle position information acquisition unit 211, a specific area detection unit 212, a position comparison unit 213, and a first pattern determination unit 214.
[0035]
The “own vehicle position information acquisition unit 211” performs the same processing as the own vehicle position information acquisition unit 111 of the transmission device 100. The “first pattern determination unit 214” performs the same process as the first pattern determination unit 114, but the sequence used to create the PN code at this time is calculated from the position information of the detection target area. The position information of the detection target area is acquired by the detection target area acquisition function of the own vehicle position information acquisition unit 211. In order to clarify the description, the vehicle position information acquisition unit 111 and the first pattern determination unit 114 of the transmission device 100 are described as different configurations, but the transmission device 100 and the reception device 200 may share them. Good.
[0036]
The “specific area detection unit 212” refers to the database 2 and detects a specific area. The specific area is a specific area where it is preferable for the own vehicle to acquire information on other vehicles. For example, there is a possibility that the own vehicle may face another area where the own vehicle may intersect. Areas that may merge, areas that may pass each other, and areas that may be overtaken. The specific area is determined based on a positional relationship with the current position of the host vehicle or a positional relationship with a planned traveling position where the host vehicle will travel. In the present embodiment, a case where the specific area is an intersection will be described as an example. The specific area detection unit 212 determines whether or not an intersection exists ahead of the host vehicle in the traveling direction based on the host vehicle position, the traveling direction, the traveling speed, etc. detected by the host vehicle position information acquiring unit 211 and the map information in the database. Determine whether. When there is an intersection in front of the traveling vehicle, the vicinity of the intersection or the like (within the predetermined distance range centering on the intersection) is determined as the specific area. This specific area is preferably defined in advance in the specific area information stored in the database 2.
[0037]
The “position comparison unit 213” compares the own vehicle position (including the predicted own vehicle position) acquired by the own vehicle position information acquisition unit 211 with the specific area detected by the specific area detection unit 212, It is determined whether the vehicle is located in the specific area or whether the host vehicle enters the specific area after a predetermined time has elapsed (after 2 seconds, after 5 seconds, etc.). Note that the reception process based on the present embodiment may be activated when the host vehicle enters a specific area or when an entry is expected, but this is not necessarily the case.
[0038]
The “first receiving means 22” includes a specific area in-vehicle detection unit 221 and a first information acquisition unit 222.
[0039]
The “specific area in-vehicle detection unit 221” has a function of determining whether there is another vehicle in the specific area. When the information transmitted by the other vehicle can be received using the first reception pattern based on the position information of the specific area, it can be determined that the other vehicle has a predetermined positional relationship with the own vehicle. On the other hand, if information cannot be received using the first reception pattern, it can be determined that there is no other vehicle at a position that can be shared with the position of the host vehicle. In this way, the specific area detection unit 221 determines whether there is another vehicle in the specific area or another predetermined area.
[0040]
The “first information acquisition unit 222” acquires first information including at least a vehicle ID from information received using the first reception pattern. The vehicle ID extracted from the first information is sent to the second reception pattern determination means 23.
[0041]
The “second reception pattern determination unit 23” includes a vehicle ID acquisition unit 231 and a second pattern determination unit 232.
[0042]
The “vehicle ID acquisition unit 231” acquires the vehicle ID from the first information acquisition unit 222.
[0043]
The “second pattern determination unit 232” determines the second reception pattern according to the vehicle ID acquired by the vehicle ID acquisition unit 231. For example, the second pattern determination unit 232 acquires a number sequence using the vehicle ID of the transmission source vehicle, and creates a PN code using the number sequence. The despreading method using this PN code is determined as the second reception pattern. The determined second reception pattern is sent to the second reception means 24. The vehicle ID used for determining the second reception pattern is associated with the vehicle ID of the transmission source vehicle included in the first information by a predetermined method.
[0044]
The “second receiving unit 24” receives the second information with the reception pattern determined by the second reception pattern determining unit 23. The second receiving unit 24 includes a second information acquisition unit 241.
[0045]
The “second information acquisition unit 241” acquires target information from the received second information. The second information acquisition unit 241 demodulates the second information subjected to spectrum spread based on the second pattern based on the second pattern determined by the second pattern selection unit 232, and relates to the vehicle situation included in the second information. Get information. Specifically, the second information received using the acquired vehicle ID as a PN code is demodulated. The acquired second information includes detailed information indicating the status of the host vehicle, such as the host vehicle position, the travel direction, and the travel speed.
[0046]
Thus, in order to acquire 2nd information using vehicle ID acquired by the 1st information acquisition part 222 of the 1st receiving means 22, the detected other vehicle is specified by vehicle ID, and it communicates selectively. It can be carried out.
[0047]
Note that, as described above, the vehicle ID is preferably the same information from when the ignition key of the vehicle is turned on to when it is off, regardless of the change in the positional relationship between the vehicle and other vehicles. Even if the positional relationship between the vehicle and another vehicle changes, communication of information with a specific vehicle can be continued based on the same vehicle ID.
[0048]
Detailed information indicating the situation of the host vehicle such as the host vehicle position, the traveling direction, and the traveling speed acquired by the second information acquisition unit 241 is a vehicle control controller that controls the traveling of the vehicle, and a display device that provides the user with the vehicle status It is sent to the other external device 4.
[0049]
The control procedure of the receiving apparatus 200 will be described based on the flowchart shown in FIG.
[0050]
Here, the flow of processing when information is acquired when the host vehicle enters a specific area will be described.
[0051]
The engine of the vehicle is started and processing is started (S1101). The vehicle status detection means 1 detects vehicle position information, travel direction, travel speed, and the like. The own vehicle position information acquisition unit 211 has the own vehicle position L B Is detected (S1103). This process may be performed based on the current position of the host vehicle, or may be performed based on the estimated travel position of the host vehicle (a position where travel is scheduled after 5 seconds). . Here, for convenience of explanation, the current position L of the host vehicle B A description will be given using an example of using.
[0052]
The specific area detection unit 212 detects the specific area with reference to the specific area information in the database 2. The specific area information is information that predefines intersections, junctions, and the like. The position comparison unit 213 compares the own vehicle position acquired by the own vehicle position information acquisition unit 211 with the position (range) of the specific area detected by the specific area detection unit 212, and the own vehicle is located in the specific area. It is determined whether or not the vehicle is likely to enter the specific area. That is, it is determined whether or not the own vehicle needs to communicate with another vehicle at present or in the future (S1105). When it is determined that information collection of a specific area is necessary, a specific area where information is to be collected is determined (S1107). As described above, the specific area is a specific area in which the host vehicle may be close to another vehicle, such as an intersection existing ahead of the host vehicle in the traveling direction.
[0053]
The 1st receiving means 22 receives the information of the other vehicle in a specific area using the 1st pattern Pn determined by the 1st receiving pattern determination means 21 (S1108). Since the first pattern is a reception pattern determined according to the detection target area, the first information acquisition unit 222 that receives using the first pattern is a vehicle located at a position (range) corresponding to the first pattern. Only the information transmitted from can be received. That is, the first information acquisition unit 222 can acquire the first information including the vehicle ID of the vehicle located in the specific area (S1109).
[0054]
If the first information can be acquired, it can be determined that there is another vehicle in the specific area. If there is a vehicle in the specific area, it is determined that more detailed second information needs to be acquired for this vehicle (S1111). The first information received on the receiving device 200 side is shown in FIG. The first information includes at least a vehicle ID, and this vehicle ID is used to determine a second pattern necessary for receiving the second information.
[0055]
The vehicle ID acquisition unit 231 of the second reception pattern determination unit 23 acquires the vehicle ID of the vehicle existing in the specific area. The second pattern determining unit 232 determines the second pattern Qn according to the vehicle ID. The second reception unit 24 receives the second information using the second pattern Qn determined by the second reception pattern determination unit 23, and the second information acquisition unit 241 acquires the second information (S1113). An example of the second information received on the receiving side is shown in FIG. The second information includes detailed information regarding the vehicle status such as the vehicle position, vehicle speed, and traveling direction. This process is continued for a necessary time in S1115.
[0056]
According to the present embodiment, necessary information can be efficiently collected. In other words, the transmitting vehicle transmits the first information using the first transmission pattern determined in accordance with the position of the host vehicle including the current position of the vehicle and the predicted traveling position of the host vehicle. Thus, the receiving-side vehicle can selectively and efficiently receive information about the vehicle that has approached or may approach the host vehicle using the first reception pattern corresponding to the detection target area. Become. Further, by including the vehicle ID in the first information that is selectively received according to the position, it is possible to selectively and efficiently collect ID information about vehicles that may approach each other.
[0057]
Furthermore, when the transmission side vehicle transmits the second information using the second transmission pattern determined according to the vehicle ID selectively collected according to the position, the reception side vehicle approaches or It is possible to identify a vehicle that is likely to approach, that is, a vehicle that needs to acquire information and receive information on the vehicle. That is, it is possible to select a vehicle from which information is to be acquired according to the position, specify the selected vehicle, and receive the specified vehicle information efficiently and reliably.
[0058]
In addition, since the first information includes a vehicle ID with a relatively small amount of information and identifies a vehicle having a predetermined positional relationship, information relating to the situation of the vehicle with a relatively large amount of information is acquired. Therefore, it is possible to reduce the processing until the target information is acquired, and to shorten the time required to acquire the information.
[0059]
In addition, since a specific area where information is to be acquired is set, and the detected own vehicle exists in the specific area, the first information is acquired, so the situation of other vehicles such as intersections and junctions Necessary information can be obtained when the user is located at a position where (position, speed, travel direction) needs to be grasped.
[0060]
[Second Embodiment]
Next, a second embodiment will be described. The second embodiment is basically in common with the first embodiment. The second embodiment includes a transmission device 100 configured as shown in FIG. 1 and a reception device 200 configured as shown in FIG. The operation of the transmission device 100 of the second embodiment is basically the same as the operation described based on FIGS. 2 and 3, and the operation of the reception device 200 of the second embodiment is based on FIGS. Basically in common with the described operation.
[0061]
The present embodiment is different from the first embodiment in that the timing for transmitting the first information and the second information is controlled so as not to interfere with the information transmitted by other vehicles. Here, a different point is demonstrated based on Fig.7 (a)-(c).
[0062]
As shown in FIG. 7A, a case where the vehicle 103 and the vehicle 104 are traveling in an area close to each other will be described as an example. The vehicle 103 and the vehicle 104 travel close to each other and travel within a range (within a predetermined distance) where the travel positions can be commonly viewed.
[0063]
The first transmission unit 12 of the vehicle 103 transmits the first information at intervals of P seconds, and the second transmission unit 14 of the vehicle 103 transmits the second information at intervals of Q seconds. The first transmission means 12 of the vehicle 104 transmits the first information at intervals of R seconds, and the second transmission means 14 of the vehicle 104 transmits the second information at intervals of S seconds.
[0064]
FIG. 7B shows a timing at which the first transmission unit 12 of the vehicle 103 transmits the first information and a timing at which the first transmission unit 12 of the vehicle 104 transmits the first information. The first transmission means 12 of the vehicle 103 transmits at intervals of P seconds with the time Tp as a reference, and the first transmission means 12 of the vehicle 104 transmits at intervals of R seconds with the time Tr as a reference.
[0065]
At time Tr + 2R, the first transmission means 12 of the vehicle 104 transmits the first information. The first transmission means 12 of the vehicle 103 transmits the first information before or after the transmission timing. In such a case, since the location information is common, the first transmission pattern corresponding to the location information is common, and the first information transmitted based on the first transmission pattern may interfere.
[0066]
In this embodiment, before the 1st transmission part 123 of the vehicle 103 transmits 1st information, the 1st transmission control part 122 performs the monitoring process of a communication condition using a 1st transmission pattern. In this monitoring process, information is received using a reception pattern capable of acquiring information based on the first transmission pattern, and if it can be received, it is determined that another vehicle is transmitting using the first transmission pattern. The monitoring process may be performed by the first transmission control unit 122 on the receiving device 200 side.
[0067]
The 1st transmission control part 122 has the other vehicle communication monitoring function which monitors the communication condition of other vehicles, and the transmission timing control function which controls the transmission timing of the 1st information according to the communication situation of other vehicles. . When the other vehicle communication monitoring function detects that another vehicle 104 is transmitting information, the transmission timing control function delays the transmission timing by an arbitrary random time (N seconds) in order to avoid the occurrence of interference. Thus, the transmission timing is controlled.
[0068]
By doing so, it is possible to control a plurality of vehicles in close positional relationship so as not to send information simultaneously using the same transmission pattern. In other words, it is possible to prevent interference between vehicles located in a range where the common first transmission pattern is determined. Incidentally, since the second transmission pattern is determined according to the vehicle ID as shown in FIG. 7C, there is no concern about interference even if the vehicle 103 and the vehicle 104 transmit the second information at the same timing. Absent.
[0069]
According to the present embodiment, the same operation and effect as the first embodiment can be achieved, and the occurrence of interference with other vehicles having a predetermined positional relationship can be prevented and continuous communication can be performed. It becomes possible.
[0070]
Although the vehicle-to-vehicle communication device 10 has been described in the present embodiment, the computer that operates according to the vehicle-to-vehicle communication program of the present invention operates in the same manner as the vehicle-to-vehicle communication device 10 and has the same effects.
[0071]
The embodiment described above is described for facilitating the understanding of the present invention, and is not described for limiting the present invention. Therefore, each element disclosed in the above embodiment is intended to include all design changes and equivalents belonging to the technical scope of the present invention.
[Brief description of the drawings]
FIG. 1 is a block diagram of a transmission device 100 according to a first embodiment.
FIG. 2 is a flowchart showing a control procedure of the transmission apparatus 100 shown in FIG.
FIGS. 3A and 3B are diagrams for explaining the first information and the second information transmitted by the transmission apparatus 100. FIG.
FIG. 4 is a block diagram of a receiving device 200 according to the first embodiment.
FIG. 5 is a flowchart showing a control procedure of the receiving apparatus 200 shown in FIG.
FIGS. 6A and 6B are diagrams for explaining first information and second information received by the receiving apparatus 200. FIG.
FIGS. 7A to 7C are diagrams for explaining a second embodiment. FIG.
[Explanation of symbols]
100: Transmitter
11: First transmission pattern determination means
111 ... Own vehicle position information acquisition unit
112 ... specific area detection unit
113: Position comparison unit
114 ... 1st pattern determination part
12 ... 1st transmission means
13: Second transmission pattern determination means 13
14: Second transmission means
200: Receiver
21: First reception pattern determination means
211 ... Own vehicle position information acquisition unit
212 ... Specific area detection unit
213: Position comparison unit
214 ... 1st pattern determination part
22: First receiving means
23. Second reception pattern determining means
1 ... Vehicle status detection means
2 ... Database
3. Output means
4 ... External device

Claims (7)

  1. A vehicle-to-vehicle communication device capable of transmitting and receiving information to and from other vehicles,
    First transmission pattern determining means for determining a first transmission pattern according to the detected position of the host vehicle;
    First transmission means for sending outward the first information including at least the vehicle ID with the first transmission pattern determined by the first transmission pattern determination means;
    Second transmission pattern determination means for determining a second transmission pattern associated with the vehicle ID included in the first information;
    Second transmission means for transmitting second information different from the first information to the outside with the second transmission pattern determined by the second transmission pattern determination means.
  2.   2. The first transmission unit transmits the first information with a first transmission pattern determined by the first transmission pattern determination unit when the host vehicle is located within a preset specific area. The vehicle-to-vehicle communication device described.
  3.   The inter-vehicle communication device according to claim 1 or 2, wherein the first transmission unit monitors a communication state of another vehicle and controls a transmission timing of the first information when the other vehicle is communicating.
  4. A vehicle-to-vehicle communication device capable of transmitting and receiving information to and from other vehicles,
    First reception pattern determination means for determining a first reception pattern according to the detection target area;
    First receiving means for receiving first information including at least a vehicle ID of a transmission source in a first receiving pattern determined by the first receiving pattern determining means;
    Second reception pattern determination means for determining a second reception pattern associated with the vehicle ID extracted from the first information;
    A vehicle-to-vehicle communication apparatus comprising: second receiving means for receiving second information different from the first information with the second receiving pattern determined by the second receiving pattern determining means.
  5.   The first receiving means is a first receiving pattern determined by the first receiving pattern determining means when the host vehicle is located in a predetermined specific area or when entering the area is expected. The vehicle-to-vehicle communication device according to claim 4, wherein the first information is received.
  6. A computer for inter-vehicle communication that can send and receive information to and from other vehicles,
    Determining a first transmission pattern according to the detected position of the host vehicle;
    Sending the first information including at least the vehicle ID to the outside in the determined first transmission pattern;
    Determining a second transmission pattern associated with the vehicle ID included in the first information;
    A program for executing the step of transmitting the second information different from the first information to the outside with the determined second transmission pattern.
  7. A computer for inter-vehicle communication that can send and receive information to and from other vehicles,
    Determining a first reception pattern according to a detection target area;
    Receiving the first information including at least the vehicle ID of the transmission source in the determined first reception pattern;
    Determining a second reception pattern associated with the vehicle ID extracted from the first information;
    A program for executing a step of receiving second information different from the first information with the determined second reception pattern.
JP2003159193A 2003-06-04 2003-06-04 Vehicle-to-vehicle communication device and vehicle-to-vehicle communication program Expired - Fee Related JP4179059B2 (en)

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Application Number Priority Date Filing Date Title
JP2003159193A JP4179059B2 (en) 2003-06-04 2003-06-04 Vehicle-to-vehicle communication device and vehicle-to-vehicle communication program

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JP4179059B2 true JP4179059B2 (en) 2008-11-12

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US8750262B2 (en) 2006-01-11 2014-06-10 Qualcomm Incorporated Communications methods and apparatus related to beacon signals some of which may communicate priority information
US8811369B2 (en) 2006-01-11 2014-08-19 Qualcomm Incorporated Methods and apparatus for supporting multiple communications modes of operation
JP4470978B2 (en) 2007-08-30 2010-06-02 トヨタ自動車株式会社 Receiving apparatus and wireless communication system
US8595501B2 (en) 2008-05-09 2013-11-26 Qualcomm Incorporated Network helper for authentication between a token and verifiers

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