JP4631476B2 - Mobile communication device and mobile communication method - Google Patents

Description

  The present invention relates to a mobile communication device and a mobile communication method for communicating information on a mobile.

  Conventionally, as described in Japanese Patent Application Laid-Open No. 2001-45013, as related to mobile communication that performs mobile information communication, after performing carrier sense, the communication channel is in an idle state (empty state). If the communication channel is busy, the number of vehicles to be communicated is estimated from the number of other vehicle IDs detected within a predetermined time, and the vehicle is transmitted. A device that sets a time interval for performing carrier sense based on the number of devices is known.

In such a communication apparatus, the position information of the host vehicle may be transmitted as vehicle information. In addition to the information on the own vehicle, the position information on the other vehicle acquired by communication may be transmitted.
JP 2001-45013 A

  In such a communication device, when the transmitted vehicle position information is not accurate or when fictitious vehicle information is transmitted, an application using the communication information cannot be properly executed due to inappropriate communication information. Further, when a lot of fictitious vehicle information is transmitted, communication traffic and fictitious vehicle information increase, and the communication system may break down.

  Therefore, the present invention has been made to solve the above-described problems, and detects mobile communication information and ensures proper operation of the communication system and mobile communication method. The purpose is to provide.

  That is, the mobile communication device according to the present invention is a mobile communication device that communicates information including position information with other mobiles, and transmission signals transmitted from a plurality of other mobiles collide with each other. Communication collision judging means for judging whether or not the transmission collision signal is judged by the communication collision judgment means to be transmitted from a plurality of other mobile bodies based on the position information of the transmission signal. Communication area determining means for determining whether or not the plurality of other mobile bodies are in a communication area capable of communicating with each other; and within the communication area in which the plurality of other mobile bodies can communicate with each other by the communication area determining means. And an information determining means for determining at least a part of the position information of the transmission signal as erroneous information when it is determined that the transmission signal is present.

  The mobile communication device according to the present invention is characterized in that the information determination unit determines, as erroneous information, position information of a transmission signal in a mobile body other than the mobile body present at the position indicated by the position information. . The mobile communication device according to the present invention is characterized in that communication is performed by a wireless communication system that performs transmission while avoiding a communication collision in a communication area.

  According to these inventions, transmission signals transmitted from a plurality of other mobile units collide with each other, and a plurality of other mobile units can communicate with each other based on position information of the transmission signals. Judge whether or not. At that time, if the transmission signals of mobile units in communication areas that can communicate with each other have a communication collision, it is determined that the position information It can be determined that part of the information is incorrect. In this way, erroneous information can be detected based on the position information of the vehicle that transmits the signal and the communication area. By excluding this erroneous information from the stored information, an appropriate communication function of the communication device can be maintained.

  The mobile communication device according to the present invention is a mobile communication device that communicates information including position information with another mobile when a signal transmitted from the other mobile is received. Communication area determination means for determining whether or not the other mobile body is within a communication area capable of communicating with itself based on position information of the transmission signal, and the communication area determination means causes the other mobile body to be It is characterized by comprising information determining means for determining position information of the other moving body as erroneous information when it is determined that it is not within the communication area.

  According to the present invention, when a signal transmitted from another mobile body is received, it is determined whether or not the mobile body is in a communication area where it can communicate with itself based on position information of the transmission signal. When it is determined that the other mobile body is not within the communication area, the position information of the other mobile body is determined as erroneous information. In this way, erroneous information can be detected based on the position information of the vehicle that transmits the signal and the communication area. By excluding this erroneous information from the stored information, an appropriate communication function of the communication device can be maintained.

  Further, the mobile communication method according to the present invention is a mobile communication method for communicating information including position information with other mobiles. Transmission signals transmitted from a plurality of other mobiles collide with each other. A communication collision determination step for determining whether or not the transmission signal transmitted from a plurality of other mobile bodies has a communication collision in the communication collision determination step, based on position information of the transmission signal A communication area determining step for determining whether or not the plurality of other mobile bodies are in a communication area capable of communicating with each other; and a communication area in which the plurality of other mobile bodies can communicate with each other in the communication area determining step. And an information determination step of determining at least a part of the position information of the transmission signal as erroneous information when it is determined that the transmission signal is within.

  The mobile communication method according to the present invention is characterized in that the information determination step determines position information of a transmission signal in a mobile body other than the mobile body present at the position indicated by the position information as erroneous information. . The mobile communication method according to the present invention is characterized in that communication is performed by a wireless communication method in which transmission is performed while avoiding a communication collision in a communication area.

  According to these inventions, transmission signals transmitted from a plurality of other mobile units collide with each other, and a plurality of other mobile units can communicate with each other based on position information of the transmission signals. Judge whether or not. At that time, if the transmission signals of mobile units in communication areas that can communicate with each other have a communication collision, it is assumed that the position information It can be determined that part of the information is incorrect. In this way, erroneous information can be detected based on the position information of the vehicle that transmits the signal and the communication area. By excluding this erroneous information from the stored information, an appropriate communication function of the communication device can be maintained.

  Further, the mobile communication method according to the present invention is a mobile communication method for communicating information including position information with another mobile when a signal transmitted from the other mobile is received. A communication area determining step for determining whether or not the other moving body is in a communication area communicable with itself based on position information of the transmission signal; and the other moving body in the communication area determining step And an information determination step of determining, as erroneous information, the position information of the other moving body when it is determined that it is not within the communication area.

  According to the present invention, when a signal transmitted from another mobile body is received, it is determined whether or not the mobile body is in a communication area where it can communicate with itself based on position information of the transmission signal. When it is determined that the other mobile body is not within the communication area, the position information of the other mobile body is determined as erroneous information. In this way, erroneous information can be detected based on the position information of the vehicle that transmits the signal and the communication area. By excluding this erroneous information from the stored information, an appropriate communication function of the communication device can be maintained.

  According to the present invention, it is possible to detect erroneous communication information and to ensure proper operation of the communication system.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the description of the drawings, the same elements are denoted by the same reference numerals, and redundant description is omitted.

  FIG. 1 shows a schematic configuration diagram of a mobile communication device according to the present embodiment. The mobile communication device 1 according to the present embodiment is a device that is mounted on a vehicle (not shown) and communicates vehicle information including vehicle position information with other vehicles, and driving assistance based on the communication information. It is applied to the driving support application that performs

  The mobile communication device 1 performs communication by a wireless communication method in which transmission is performed while avoiding a communication collision in a communication area. As the communication method, for example, a CSMA (CarrierSense Multiple Access) method is used. In the CSMA system, a communication apparatus transmits a signal after confirming a free state (idle state) of a communication path.

  As shown in FIG. 1, the mobile communication device 1 includes a communication unit 2, an antenna 3, and a control unit 4. The communication unit 2 functions as a transmission unit that transmits information on the own vehicle to another mobile unit through the antenna 3 and also functions as a reception unit that receives information from the other mobile unit through the antenna 3. For example, the communication unit 2 modulates a carrier wave according to transmission information sent from the control unit 4 to generate a transmission signal, and transmits the transmission signal from the antenna 3. Moreover, the communication part 2 demodulates a received signal, for example, and extracts the information of another moving body. The extracted information is input to the control unit 4.

  The control unit 4 controls the entire apparatus, and is configured mainly by a computer including a CPU, a ROM, and a RAM, for example. The control unit 4 is connected to the communication unit 2, inputs a signal received from the antenna 3 through the communication unit 2, and stores information included in the signal. Examples of the information included in the signal include vehicle ID information and vehicle position information. When receiving the signal, the control unit 4 functions as a reception determination unit that determines whether or not transmission signals transmitted from a plurality of other vehicles are received simultaneously.

  Moreover, when the transmission signal transmitted from several other vehicles is received simultaneously, the control part 4 is in the communication area where several other vehicles can mutually communicate based on the positional information on the transmission signal. It functions as a communication area determination means for determining whether or not. In addition, when a plurality of other vehicles are in a communication area where they can communicate with each other, the control unit 4 functions as an information determination unit that determines at least a part of position information of these other vehicles as erroneous information.

  The control unit 4 functions as a transmission control unit that causes the communication unit 2 to transmit vehicle information. For example, carrier sense is performed, a signal transmission state of another vehicle is detected through the communication unit 2, and vehicle information is transmitted when the communication channel is in an idle state.

  The control unit 4 is connected to the operation unit 5. The operation unit 5 includes an operation start switch, an operation end switch, and the like of the communication device 1. The control unit 4 is connected to the navigation unit 6. The navigation unit 6 functions as a vehicle position detection unit that can detect the traveling position of the vehicle on a map. For example, the navigation unit 6 stores map information in advance and detects the vehicle position using a GPS (Global Positioning System). What to do is used. The vehicle position information of the host vehicle is input from the navigation unit 6 to the control unit 4. In addition, as a navigation part 6, as long as it can acquire the positional information of the own vehicle, road information, etc., you may use things other than GPS.

  The control unit 4 is connected to the information providing unit 7. The information providing unit 7 is information providing means for providing information related to driving to the driver of the host vehicle, and corresponds to, for example, a display monitor, a lamp, a buzzer, a speaker, and the like. The control unit 4 is connected to the actuator 8. The actuator 8 is a drive unit that supports driving, and corresponds to, for example, a brake, a throttle, a transmission, and the like.

  Furthermore, the control unit 4 also functions as an application processing unit that processes an application executed in response to communication. For example, the control unit 4 processes the reception information input from the communication unit 2 and executes an application such as driving assistance based on the reception information. The driver assistance application recognizes the position of other vehicles, and notifies the danger by buzzer, sound, lamp display, liquid crystal display, etc. when the own vehicle has a high risk of collision with other vehicles, The brake operation control is forcibly performed when there is a possibility of collision with the vehicle.

  Next, the operation of the mobile communication device and the mobile communication method according to the present embodiment will be described.

  FIG. 2 is a flowchart of the operation of the mobile communication device 1 according to this embodiment. The control process of FIG. 2 is repeatedly executed by the control unit 4 at predetermined time intervals, for example.

  As shown in S10 of FIG. 2, communication processing is first performed. The communication process is a process of outputting the vehicle information of the own vehicle as a transmission signal to the communication unit 2 and inputting a reception signal of another vehicle as reception information. The transmission signal output from the control unit 4 to the communication unit 2 is transmitted through the antenna 3. The input reception information is input to the control unit 4 through the communication unit 2.

  Signal transmission in the communication processing is performed so as to avoid communication collision in the communication area. For example, after carrier sense is performed, and it is confirmed that no other vehicle is transmitting within the communication area and the communication path is in an idle state, signal transmission is performed.

  And it transfers to S12 and a vehicle information reading process is performed. The vehicle information reading process is a process of reading vehicle information included in the received signal. At this time, the read information includes vehicle ID information and vehicle position information.

  Then, the process proceeds to S14 to determine whether or not a communication collision has occurred. For example, it is determined whether transmission signals transmitted from a plurality of other vehicles are received simultaneously. In this case, it is determined that a communication collision has occurred when signals are simultaneously received from different other vehicles in the communication processing of S10. On the other hand, in the communication processing of S10, it is determined that no communication collision has occurred when there is no simultaneous signal reception from different other vehicles. Further, when the communication method is a frequency multiplexing method or a code multiplexing method, it is determined that a communication collision has occurred when the transmission signals of the same channel among a plurality of channels are received simultaneously. When the communication method is a time multiplexing method, it is determined that a communication collision has occurred when the transmission signals are received simultaneously.

  When it is determined in S14 that a communication collision has occurred, communication area calculation processing is performed (S16). This communication area calculation process is a first communication area calculation process, and is a process for calculating the communication area of the vehicle causing the communication collision. For example, calculation processing is performed by acquiring ID information and vehicle position information of a vehicle that has caused a communication collision and estimating a communication area from the vehicle position information. In that case, it is preferable to estimate the communication area in consideration of the transmission output of the vehicle. The estimated communication area of each vehicle is calculated and output in the coordinate range of longitude and latitude, for example.

  Then, the process proceeds to S18, and it is determined whether or not the vehicles that are causing the communication collision are in a communication area where they can communicate with each other. This determination process is performed based on the vehicle position information included in the transmission signal. That is, it is determined in S16 whether or not the other vehicles are in the communication area calculated based on the vehicle position information.

  If the vehicle causing the communication collision is not in the communication area where communication is possible in S18, it is determined that there is no error in the vehicle position information, and the control process is terminated. On the other hand, when the vehicles having a communication collision in S18 are in a communication area where they can communicate with each other, there is an abnormality in the communication rules, and thus an erroneous information determination process is performed (S20).

  The erroneous information determination process is a process for determining at least a part of the vehicle position information of the vehicle causing the communication collision as erroneous information. For example, for a vehicle that has been found to exist at a position indicated by the vehicle position information among vehicles that have caused a communication collision, the vehicle position information is the correct information.

  The presence at the position indicated by the vehicle position information is detected by the vehicle information by other means such as infrastructure. In addition, when it is possible to determine that the vehicle exists at the position indicated by the vehicle position information transmitted by another vehicle, such as a radar or a camera, the object detection unit mounted on the vehicle, the vehicle position You may judge that it exists in the position shown in information.

  Further, when it is determined in S26 to be described later that there is no error in the vehicle position information transmitted by other vehicles in the past, it may be determined that the vehicle exists at the position indicated by the vehicle position information. . Further, as long as it can be determined that another vehicle is present at the position indicated by the vehicle position information, the determination is not limited to these methods, and other methods or other means may be used.

  On the other hand, for vehicles other than the vehicle existing at the position indicated by the vehicle position information, the vehicle position information is misinformation.

  Then, the process proceeds to S22 and erroneous information processing is performed. This erroneous information processing is a process for taking countermeasures against erroneous information. For example, information determined as erroneous information is not used in a driving support application. Thereby, inappropriate driving support can be prevented. Moreover, you may transmit to another vehicle that there is an error in the vehicle position information of another vehicle. In this case, an appropriate communication system can be operated.

  By the way, when it is determined in S14 that no communication collision has occurred, a communication area calculation process is performed (S24). This communication area calculation process is a second communication area calculation process and is different from the process of S16. The processing content is processing for calculating the communication area of the host vehicle. For example, the communication area of the host vehicle is estimated based on vehicle position information, transmission output, and reception sensitivity. The estimated communication area of each vehicle is calculated and output in the coordinate range of longitude and latitude, for example.

  Then, the process proceeds to S26, and it is determined whether or not another vehicle that has transmitted a signal to the own vehicle is within the communication area of the own vehicle. This determination process is performed based on the vehicle position information of the other vehicle and the communication area information of the own vehicle included in the transmission signal. That is, it is determined whether or not the other vehicle is in the communication area calculated based on the vehicle position information in S24.

  If another vehicle that has transmitted a signal to the vehicle in S26 is within the communication area of the vehicle, it is determined that there is no error in the vehicle position information, and the control process is terminated. On the other hand, if the other vehicle that has transmitted the signal to the host vehicle in S26 is not within the communication area of the host vehicle, an abnormality has occurred in the communication rule, and thus an erroneous information determination process is performed (S28). The erroneous information determination process is a process of determining vehicle position information of a vehicle that has transmitted a signal to the host vehicle as erroneous information.

  And it transfers to S30 and incorrect information processing is performed. This erroneous information processing is a process for taking countermeasures against erroneous information. For example, information determined as erroneous information is not used in a driving support application. Thereby, inappropriate driving support can be prevented. Moreover, you may transmit to another vehicle that there is an error in the vehicle position information of another vehicle. In this case, an appropriate communication system can be operated. Then, the control process ends.

  Next, the operation of the mobile communication device and the mobile communication method according to the present embodiment will be described with specific examples.

  FIG. 3 is a diagram showing the positional relationship of the vehicle and the communication area. Within a predetermined distance range from the host vehicle 10 is a communication area 10a capable of communicating with the host vehicle 10. Further, a communication area 20 a that can communicate with the other vehicle 20 is within a predetermined distance range from the other vehicle 20. The own vehicle 10 is in the communication area 20a of the other vehicle 20, and the other vehicle 20 is in the communication area 10a of the own vehicle 10 and can communicate with each other. At this time, the other vehicle 20 transmits its own vehicle position information to the own vehicle 10 as accurate information without error.

  In this situation, when there is another vehicle 31 that is within the range of both the communication areas 10a and 20a and a communication collision between the other vehicle 20 and the other vehicle 31 occurs, transmission is performed while avoiding the communication collision in the communication area. It is an abnormal situation in the communication system to be performed. In this case, when the vehicle position information of the other vehicle 20 is correct information, it can be determined that the vehicle position information of the other vehicle 31 is incorrect information.

  In addition, when there is another vehicle 32 that is within the communication area 10a but outside the communication area 20a, and a communication collision between the other vehicle 20 and the other vehicle 32 occurs, the other vehicle 32 is carrier sense and the other vehicle 20 Since the transmission status cannot be detected, there is no abnormality in the communication method. For this reason, in this case, it cannot be determined that the vehicle position information of the other vehicle 31 is erroneous information.

  In addition, when there are other vehicles 33 and 34 outside the communication area 10a, and these other vehicles 33 and 34 communicate directly with the own vehicle 10, they are communicating even though they are in a position where communication is impossible. Is abnormal. For this reason, in this case, it can be determined that the vehicle position information of the other vehicles 33 and 34 is erroneous information.

  As described above, according to the mobile communication device 1 and the mobile communication method according to the present embodiment, transmission signals transmitted from a plurality of other vehicles are simultaneously received, and the position information of these transmission signals is included. Based on this, it is determined whether or not a plurality of other vehicles are in a communication area where they can communicate with each other. At that time, if information signals are transmitted simultaneously from vehicles in communication areas that can communicate with each other, a part of the position information is assumed not to follow the wireless communication system that performs transmission by avoiding communication collision in the communication area. Can be determined to be incorrect information. In this way, it is possible to ensure proper operation of the communication system by detecting erroneous vehicle information and removing the erroneous information from the stored information.

  Further, by removing erroneous information from the stored information, the storage amount in the communication device can be reduced, and smooth storage processing can be performed. Moreover, smooth information processing in the communication device can be achieved by removing erroneous information from information processing targets. Furthermore, an appropriate application can be executed by executing the application based on the vehicle information excluding erroneous information.

  In addition, according to the mobile communication device 1 and the mobile communication method according to the present embodiment, each vehicle can be connected between vehicles without using another communication means such as a mobile phone, a communication monitoring base station, and infrastructure. Information can be judged and excluded autonomously without stopping communication. In addition, information can be determined and eliminated without introducing a communication format, a communication protocol, or the like that suppresses erroneous information. Further, it is possible to determine whether or not the information is incorrect without using a surrounding monitoring sensor or the like to search for and detect a vehicle that transmits abnormal information. Further, it is possible to judge and eliminate whether or not the information is incorrect without interrogating the vehicle that transmits abnormal information from the own vehicle and making an information request or a communication request.

  In addition, in the mobile communication device 1 and the mobile communication method according to the present embodiment, in addition to the case where another vehicle transmits erroneous information due to an abnormal operation of a position detection device such as a GPS, the other vehicle deliberately uses aerial information. It is possible to cope with the case of transmitting (erroneous information). In this case, the communication device can be prevented from being confused by the fictitious information, and a normal communication function can be maintained.

  In addition, when misinformation is detected, the fact that the position information transmitted by the vehicle is misinformation can be transmitted to other vehicles, thereby preventing the communication system from being confused by misinformation. A reliable communication function.

  In addition, although this embodiment demonstrated what performs only communication between vehicles, the communication apparatus for mobile bodies and the communication method for mobile bodies which concern on this invention are not restricted to such a thing. A mobile body that is not a vehicle may be used, and another mobile body may communicate with a mobile body other than the vehicle, such as a pedestrian.

  Further, the present embodiment describes the best embodiment of the mobile communication device and the mobile communication method according to the present invention, and the mobile communication device according to the present invention is the one described in the present embodiment. It is not limited to. The mobile communication device and the mobile communication method according to the present invention can be variously modified without departing from the spirit thereof.

1 is a schematic configuration diagram of a mobile communication device according to an embodiment of the present invention. It is a flowchart which shows the operation | movement of the communication apparatus for mobile bodies of FIG. 1, and the communication method for mobile bodies which concerns on embodiment. FIG. 2 is a specific explanatory diagram of the operation of the mobile communication device of FIG. 1 and the mobile communication method according to the embodiment.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Mobile communication apparatus, 2 ... Communication part, 3 ... Antenna, 4 ... Control part, 5 ... Operation part, 6 ... Navigation part, 7 ... Information provision part, 8 ... Actuator.

Claims (8)

In a mobile communication device that communicates information including position information with other mobiles,
A communication collision determination means for determining whether or not a transmission signal transmitted from a plurality of other mobile bodies has a communication collision;
When the communication collision determination means determines that transmission signals transmitted from a plurality of other mobile bodies have collided with each other, the plurality of other mobile bodies can communicate with each other based on position information of the transmission signals. A communication area determination means for determining whether or not the communication area is within the communication area;
Information determining means for determining, as erroneous information, at least a part of the position information of the transmission signal when the communication area determining means determines that the plurality of other mobile bodies are in a communication area in which communication is possible with each other;
A mobile communication device comprising:   2. The mobile communication apparatus according to claim 1, wherein the information determination unit determines position information of a transmission signal in a mobile body other than the mobile body present at the position indicated by the position information as erroneous information.   The mobile communication apparatus according to claim 1 or 2, wherein communication is performed by a wireless communication method in which transmission is performed while avoiding a communication collision in a communication area. In a mobile communication device that communicates information including position information with other mobiles,
When a signal transmitted from the other mobile unit is received, a communication area determination for determining whether the other mobile unit is within a communication area capable of communicating with itself based on position information of the transmission signal Means,
Information determining means for determining position information of the other moving body as erroneous information when the communication area determining means determines that the other moving body is not within the communication area;
A mobile communication device comprising: In a mobile communication method for communicating information including position information with another mobile,
A communication collision determination step of determining whether or not transmission signals transmitted from a plurality of other mobile bodies have a communication collision;
When it is determined in the communication collision determination step that transmission signals transmitted from a plurality of other mobile bodies have a communication collision, the plurality of other mobile bodies can communicate with each other based on position information of the transmission signals. A communication area determining step for determining whether or not the user is in a communication area;
An information determination step of determining at least a part of the position information of the transmission signal as erroneous information when it is determined in the communication area determination step that the plurality of other mobile bodies are in a communication area in which communication is possible with each other; ,
A communication method for a mobile unit, comprising:   6. The mobile communication method according to claim 5, wherein the information determination step determines position information of a transmission signal in a mobile body other than the mobile body present at the position indicated by the position information as erroneous information.   The mobile communication method according to claim 5 or 6, wherein communication is performed by a wireless communication method in which transmission is performed while avoiding a communication collision in a communication area. In a mobile communication method for communicating information including position information with another mobile,
When a signal transmitted from the other mobile unit is received, a communication area determination for determining whether the other mobile unit is within a communication area capable of communicating with itself based on position information of the transmission signal Process,
When it is determined that the other moving body is not in the communication area in the communication area determining step, an information determining step for determining position information of the other moving body as erroneous information;
A communication method for a mobile unit, comprising:

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