KR100973080B1 - Method of transmitting information between vehicles and its device - Google Patents

Abstract

The present invention relates to an inter-vehicle information transfer method and apparatus for determining a relay vehicle for transmitting a plurality of information between vehicles and transmitting a message.

In the relay vehicle determining method according to the present invention, a Hello message sending step of collecting driving information of a vehicle and generating and transmitting a Hello message including the collected driving information, a Hello message receiving a Hello message sent by another vehicle And a relay vehicle determining step of determining, as the relay vehicle, another vehicle having a similar driving situation with the own vehicle based on the reception step and the received Hello message and the own vehicle driving information.

According to the present invention, even if the driving environment of the vehicle changes, it is possible to accurately transmit the message between the vehicles.

Multi-hop, vehicle radio communication, alarm transmission, emergency information transmission, inter-vehicle communication

Description

Method and device for communication between vehicles {METHOD FOR INTER-VEHICLES COMMUNICATION AND APPARATUS OF TRAFFIC BROADCAST THEREOF}

The present invention relates to an inter-vehicle information transfer method and apparatus, and more particularly, to an inter-vehicle information transfer method and apparatus for transmitting information between vehicles even while driving.

The conventional inter-vehicle information transmission method transmits a message without maintaining information on a relay vehicle to which an information message (for example, emergency information or warning information) is to be transmitted. That is, when generating or receiving an information message, a method of selecting a vehicle located within a radio communication range and broadcasting the message is selected.

Although the prior art can reduce the complexity of network operation, there is a problem in that it is not suitable for delivering a warning message requiring promptness since a certain time is required to select a relay vehicle to deliver a warning message, and also in a tunnel. There is a problem that can not be used in the event of an accident.

According to another prior art information transmission method, each vehicle maintains location information about all other vehicles existing within a radio communication range, and when an information message needs to be transmitted, an arbitrary position within a radio wave radius is determined as a threshold value. The relay vehicle is selected through the competition among the vehicles located within the radius of the threshold value and the information is transmitted. At this time, the retransmission time is set in inverse proportion to the distance between the transmitting vehicle transmitting the information message and the receiving vehicle receiving the information message. Accordingly, the vehicle farthest from the transmitting vehicle within the threshold range can relay the retransmission fastest.

However, such a prior art has a problem that a message collision may occur because a vehicle located at the same boundary distance can send an information message at the same time, resulting in a delay when sending a warning message.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-described problems, and an object of the present invention is to provide an inter-vehicle information transmission method and apparatus capable of transmitting information messages quickly and efficiently by maintaining an optimum relay vehicle in consideration of driving conditions.

Relay vehicle determination method according to an aspect of the present invention for achieving the above object, a Hello message transmission step of collecting and transmitting the driving information of his vehicle and generating a Hello message including the collected driving information, other vehicles Receiving a Hello message receiving the transmitted Hello message and a relay vehicle determining step of determining the other vehicle having a similar driving situation with the own vehicle as a relay vehicle based on the received Hello message and the own vehicle driving information It features.

The inter-vehicle information transmission method according to another aspect of the present invention includes a Hello message sending step of collecting driving information of a vehicle and generating and transmitting a Hello message including the collected driving information, and a Hello message sent by another vehicle. A relay vehicle determining step of determining a predetermined number of other vehicles having similar driving conditions as the relay vehicle based on the own vehicle driving information, and an information message transmitting step of transmitting an information message to the determined relay vehicle; It features.

The inter-vehicle information transmission device according to another aspect of the present invention, a driving information management unit for collecting the driving information of the vehicle, a Hello message management unit for generating a Hello message to include the driving information and control the communication unit to transmit and receive it, other vehicles A relay manager configured to determine a predetermined number of other vehicles having similar driving conditions as a relay vehicle based on the Hello message and the driving information received from the controller, and an information message manager configured to control a communication unit to transmit an information message to the relay vehicle. It is characterized by.

According to the present invention, since the relay vehicle can be appropriately determined by reflecting the driving information of the own vehicle and the driving information of the other vehicle, the message can be transmitted, and thus, the message can be transmitted quickly and accurately even when the driving environment changes.

Hereinafter, with reference to the accompanying drawings will be described in detail a preferred embodiment of the present invention.

The inter-vehicle information transfer device according to the present invention forms an add-hoc network with a plurality of vehicles to generate and maintain a list of optimal nodes (vehicles), thereby quickly transmitting an information message. And multi-hop communication to ensure that information messages can be delivered accurately.

To this end, each vehicle of the present invention broadcasts a message including driving information of the vehicle, such as the position, speed, azimuth, and acceleration of the vehicle periodically or as needed. This message is hereinafter referred to as a 'Hello message'.

1 is a block diagram of a vehicle-to-vehicle information transmission device according to the present invention.

As shown in FIG. 1, the apparatus for transmitting information includes a driving information collecting unit 100, a sensor unit 200, a control unit 300, a communication unit 400, and a display unit 500.

The driving information collecting unit 100 is configured of devices capable of collecting driving information (eg, traveling speed, acceleration, position, traveling direction, etc.) of the current vehicle. That is, it may be configured to include a Global Positioning System (GPS) module 110, the speedometer device 120 and the acceleration sensor 130, it is possible to obtain the driving information of the vehicle through these devices. . In this case, the speedometer device 120 may include a gyro sensor capable of calculating a rotation angle of the vehicle. The driving information of the vehicle collected from the driving information collection unit 100 is used by the control unit 300 to calculate the relay vehicle.

The sensor unit 200 senses and collects environment information of a vehicle equipped with the information transmission device. The sensor unit 200 may include various sensor devices such as a temperature sensor 210, an image sensor 220, an impact sensor 230, and the surrounding environment information collected by the sensor unit 200. Is used by the control unit 300 to generate the information message.

The communication unit 400 wirelessly performs data communication with an information transmission device of another vehicle.

The controller 300 determines the relay vehicle based on the driving information received from the driving information collecting unit 100 and the Hello message of another vehicle received through the communication unit 400, and generates, updates, and manages the list of the relay vehicles. And control the communication unit 400 to transmit the information message for the relay vehicle.

The controller 300 may include a driving information manager 310, a Hello message manager 320, an information message manager 330, and a relay manager 340.

The driving information management unit 310 collects driving information generated by the driving information collecting unit 100, and transfers the collected driving information to the Hello message managing unit 320 and the relay managing unit 340. In this case, the driving information may include at least one of the position, the speed, the acceleration, the azimuth information, and the combined information of the vehicle.

The Hello message management unit 320 controls the communication unit 400 to generate a Hello message and transmit it to another vehicle, and when the Hello message sent by another vehicle is received, the Hello message of the received other vehicle to the relay manager 340. To pass. These Hello messages can be generated and sent periodically or as needed.

That is, the Hello message manager 320 receives driving information from the driving information manager 310 and generates a Hello message including driving information, a vehicle identifier, and the like. In addition, the communication unit 400 is controlled to transmit the generated Hello message of the own vehicle to the other vehicle.

The relay manager 340 determines a relay vehicle for a vehicle having a similar driving situation to that of the own vehicle based on the Hello message received from another vehicle and the driving information. In addition, the relay manager 340 generates and manages the determined list of relay vehicles, and receives a new Hello message from another vehicle or determines a relay vehicle and updates the relay vehicle list when a change occurs in driving information of the vehicle.

2 is a configuration diagram of the relay management unit according to FIG. 1, and as illustrated in FIG. 2, the relay management unit 340 may include a relay vehicle calculator 341, a relay vehicle information storage unit 342, and a relay vehicle information update unit 343. ) May be included.

The relay vehicle calculator 341 determines a predetermined number of other vehicles having a small difference between the driving information of the other vehicle and the driving information of the own vehicle as the relay vehicle. At this time, the driving information of the other vehicle is included in the Hello message received from the other vehicle.

The relay vehicle calculator 341 includes a speed calculator 341-1, a relative distance calculator 341-2, an azimuth calculator 341-3, an acceleration calculator 341-4, and a score calculator 341-5. can do.

The speed calculating unit 341-1, the relative distance calculating unit 341-2, the azimuth calculating unit 341-3 and the acceleration calculating unit 341-4 are driving information (eg, speed, relative distance, azimuth angle) of other vehicles and their vehicles. And acceleration) and a weight value is added to the difference to calculate a score for each element.

The score calculator 341-5 adds all the score values for each element calculated by each of these calculators 341-1,341-2,341-3,341-4. In addition, the score value of the other vehicle calculated as described above is compared with the score value of the relay vehicle recorded in the relay vehicle information storage unit 342. According to the comparison result, the vehicle having a large score value is updated to be recorded in the relay vehicle list maintained by the main vehicle information storage unit 342. The calculation method by the relay vehicle calculating unit 341 will be described in detail below with reference to FIG. 4.

The relay vehicle information storage unit 342 stores the relay vehicle determined by the relay vehicle calculation unit 341. To this end, the relay vehicle information storage unit 342 constructs and manages a list of relay vehicles.

When there is a change in the basic information (Hello message received from another vehicle and driving information of the own vehicle) for determining the relay vehicle, the relay vehicle information updating unit 343 recalculates the relay vehicle based on the changed information. The relevant information is provided to the relay vehicle calculating unit 341. Such an update may occur at periodic time intervals as well as when there is a change in basic information for determining a relay vehicle.

The information message manager 330 receives the sensing information from the sensor 200 and generates an information message. That is, the sensing unit 200 receives the sensing information to generate emergency information, accident information, road information, traffic progress information, weather information, and the like. In addition, the vehicle identification information and the transmission hop number information of the own vehicle are further added to transmit the same to other vehicles.

The generated information message is transmitted to the relay vehicle by adding the relay vehicle information received from the relay manager 340.

In addition, the information message manager 330 controls the communication unit 400 to receive the information message transmitted by another vehicle, interprets the received information message and displays it to the user through the display unit 500. Alternatively, the information message manager 330 may modify some information (eg, vehicle identification information or transmission hop number information of the vehicle) of the received information message (eg, modify the transmission hop number information to be subtracted first) and the corrected information. The communication unit 400 is controlled to transmit a message to the vehicle listed in the relay vehicle list.

The display unit 500 displays the information included in the information message or the driving information of the vehicle to the vehicle driver. The display unit 500 may include a voice processor 510, a driving information display unit 500, and a message display unit 500. The voice processor 510 notifies the driver of the driving information or the information of the information message by voice, and the driving information display unit 500 displays the driving information of the vehicle to the user. In this case, the driving information of the own vehicle may be received through the control unit 300 or may be directly transmitted from the driving information collection unit 100. The message display unit 500 receives predetermined information (eg, accident information, weather information, road information, traffic jam information, emergency situation information, etc.) included in the information message received from another vehicle, and displays the received information from the control unit 300. do. It is apparent that the display unit 500 may also be implemented to further include or be integral with a predetermined input means (eg, a touch screen, a keypad, etc.).

3 is a diagram illustrating a driving situation according to a preferred embodiment of the present invention.

Hereinafter, a process of calculating a score value for determining a relay vehicle will be described in detail with reference to FIG. 3.

As shown in FIG. 3, vehicle A maintains a relay vehicle list based on hello frames transmitted from neighboring vehicles B, C, D, E, and F before an emergency occurs. In this situation, the vehicle A maintains itself, selects a relay vehicle based on the relay vehicle list, and broadcasts the selected vehicle information to the surrounding vehicles by placing the selected vehicle information in an information message.

The criterion for selecting the relay vehicle may be determined as a vehicle having the smallest azimuth difference at the optimum distance and proceeding at a speed and acceleration similar to that of vehicle A. That is, a table as shown in [Table 1] can be created based on information collected from each other vehicle located in the communication range, and the algorithm for selecting a relay vehicle will be described in detail based on the contents of this table. Hereinafter, an algorithm for selecting a relay vehicle using distance, speed, azimuth, and acceleration as driving information for selecting a relay vehicle will be described.However, a relay vehicle may be selected through the following algorithm using other equal information or other information. It can be obvious.

Node Street speed Azimuth Difference Acceleration difference B 100 m 100 km / h 0 degrees 0 C 200 m 100 km / h 45 degrees 0 D 220 m 110 km / h 45 degrees 0 E 210m 90 km / h 0 degrees 10 F 230 m 100 km / h 0 degrees 0

The score (SCORE _vehicle ) of each vehicle to determine the relay vehicle is determined by Equation 1 below.

That is, a score corresponding to each element (eg, distance, speed, azimuth, and acceleration) constituting the driving information is calculated and summed to determine a score of another vehicle, and a score value is determined for each of a plurality of other vehicles. If the score value is greater than or equal to that of the existing relay vehicle, it is selected as a new relay vehicle.

Hereinafter, the calculation of score values for each element (SCORE _V , SCORE _D , SCORE _H , SCORE _A ) will be described in detail.

Equation 2 below is a formula for determining the score value SCORE _V for the speed.

This is obtained by multiplying the weight W _V for the speed by subtracting V _offset from 10. At this time, V _offset is determined by Equation 3 below.

At this time, V _my is the speed of the vehicle, V _hello is the speed of the other vehicle that sent the Hello message. G _v is the granularity of velocity.

That is, by calculating a modulo with the granularity G _v , the speed difference between the own vehicle and the other vehicle can be obtained. V _offset calculated in this way The value is preferably expressed as an integer, and the larger the value, the larger the speed difference between the own vehicle and the other vehicle. If the G _v value is 10 km / h, the maximum value of this V _offset value is 10.

Equation 4 below is a formula for determining the score value SCORE _D for the distance.

SCORE _D is obtained by multiplying weight W _D over distance by subtracting D _offset from 10. At this time, D _offset is determined by Equation 5 below.

At this time, D _opt is the optimum distance and D _bet is the distance between the other vehicle and its own vehicle that sent the Hello message. The optimal distance means the distance at which the information message is received at an error rate lower than a specific error rate, and G _D is the granularity of the speed.

That is, by calculating a modulo with the granularity G _D , the difference between the optimum distance and another vehicle can be obtained. The D _offset value is expressed as an integer. The larger the value, the larger the difference between the optimal distance and the distance between other vehicles. If G _D is set to 10, the maximum value of D _offset is 10.

Equation 6 below is a formula for determining the score value SCORE _H for the azimuth.

SCORE _H is obtained for a value obtained by subtracting the H _offset at 10 by multiplying the weight (Weight) W _H for azimuth. At this time, H _offset is determined by Equation 7 below.

At this time, V _my is the azimuth angle (progress direction) of the own vehicle, V _hello is the azimuth angle (progress direction) of the other vehicle that transmitted the Hello message. G _H is the granularity for azimuth.

That is, by calculating a modulo of the difference between the azimuths of the own vehicle and the other vehicle with a granularity G _H , a value for the difference between the azimuth angles of the own vehicle and the other vehicle can be obtained. H _offset calculated as The value is preferably expressed as an integer, and the larger the value, the larger the difference in azimuth angle between the own vehicle and the other vehicle. If the G _H value is 10, the maximum value of this H _offset value is 10.

Equation 8 below is a formula for determining the score value SCORE _H for acceleration.

SCORE _A is obtained by subtracting A _offset from 10 and multiplying the weight W _A for acceleration. At this time, A _offset is determined by Equation 9 below.

At this time, A _my is the acceleration of the own vehicle, A _hello is the acceleration of the other vehicle that sent the Hello message. G _A is the granularity for acceleration.

That is, by calculating a modulo in the granularity G _A with a difference in acceleration between the own vehicle and another vehicle, a value for the acceleration difference between the own vehicle and the other vehicle can be obtained. A _offset calculated as The value is preferably expressed as an integer, and the larger the value, the larger the difference between the acceleration of the own vehicle and the other vehicle. If the G _A value is 10, the maximum value of this A _offset value is 10.

4 is a diagram illustrating a process of determining and updating a relay vehicle according to the above-described score value determination method.

In the present example, a process of selecting a relay vehicle using three factors such as distance, speed, and azimuth for convenience of understanding is illustrated, but the elements described above are not meant to limit the determination of the relay vehicle.

Any self-vehicle receives information (Hello message) from surrounding vehicles (A, B, C, D), and uses it to obtain the offset value for each parameter as described above and use it for the corresponding node (other vehicle). When the score is calculated, it is assumed that a value as shown in FIG. 4 can be obtained.

As shown in FIG. 4, 100 points were calculated as a result of receiving information from the first vehicle A and calculating a score based on the information. This indicates that the parameters of the own vehicle and the vehicle A coincide within a certain range. Therefore, vehicle A is selected as a relay vehicle.

After receiving the information from the vehicle B and calculating the score of the vehicle B based on the received driving information of the vehicle B, 81 points were obtained. Assuming that up to two relay vehicles can be selected at present, B may be selected as a relay vehicle. The number of relay vehicles applicable to the relay vehicle list can be arbitrarily set.

Thereafter, information was received from the vehicle C, and a score was calculated based on the information to obtain 90 points. Since the score is higher than that of the existing relay vehicle B, C is selected as the new relay vehicle, and the relay vehicle list is updated.

Thereafter, information is received from the vehicle D, and the score of the vehicle D is 88, but since the score is lower than that of the existing relay vehicle (vehicle C), the relay vehicle list is not updated.

In the above-described algorithm of selecting a relay vehicle with reference to FIG. 4, there are granularity and optimal distance and weight variables for each parameter (element of driving information), and these values are not fixed values, but surrounding conditions of the vehicle. It can vary according to.

For example, when a vehicle travels at high speed, there is a high possibility that neighboring vehicles also travel at high speed. This means that the state of the wireless channel is different than when the vehicle moves at low speed, and thus the probability of successfully delivering an information message is lower. Therefore, it is necessary to recalculate the optimum distance accordingly. Similarly, granularity and weight can be varied depending on the vehicle driving environment.

In addition, the algorithm proposed in the present invention can arbitrarily or necessarily set parameters required for relay vehicle selection. That is, the above description is based on speed, azimuth, and distance, but may be calculated to include various other driving information.

In addition, by setting the weights differently for each of these parameters, it is possible to give priority to each parameter. For example, in a driving environment such as a highway driving at a high speed, the factors related to speed and distance may have a greater influence on wireless communication than other factors such as azimuth, so in this case, a greater weight is given to the speed or distance. can do.

In addition, the sensor unit 200 may recognize the driving environment of the vehicle, and accordingly, the weight, the optimal distance, and the granularity may be changed so that the optimal relay node may be selected.

FIG. 5 is a flowchart illustrating a method for determining a relay vehicle according to the present invention, and FIG. 6 is a flowchart showing detailed steps of the relay vehicle determining step according to FIG. 5.

Hereinafter, a method for determining a relay vehicle according to the present invention will be described in detail with reference to FIGS. 5 and 6.

The driving information manager 310 controls the driving information collecting unit 100 to collect driving information (S510), and transmits the collected driving information to the relay manager 340.

Thereafter, the Hello message manager 320 receives the collected driving information from the driving information manager 310 to generate a Hello message including the received driving information, and controls the communication unit 400 to transmit the generated Hello message (S520). ).

In addition, the Hello message management unit 320 controls the communication unit 400 to receive the Hello message sent by another vehicle (S530), and transmits the received Hello message transmitted by the other vehicle to the relay manager 340.

Thereafter, the relay manager 340 determines, as a relay vehicle, a predetermined number of other vehicles having similar driving conditions with the own vehicle based on the received Hello message of the other vehicle and the driving information of the own vehicle (S540).

This relay vehicle determination step (S540) is composed of a predetermined step as shown in FIG. That is, the driving information of the other vehicle is detected from the Hello message received from the other vehicle (S541), and the relay vehicle calculating unit 341 determines the driving information of the other vehicle based on the detected driving information of the other vehicle and the driving information of the own vehicle. The score value is calculated (S542). Since the calculation of the score value is performed for each Hello message received from other vehicles, each other vehicle is determined to be a vehicle having a similar driving condition to its own vehicle based on the score value. That is, the score value of each vehicle can be calculated, and a predetermined number of other vehicles can be determined as the relay vehicle based on the magnitude of the score value (for example, in order of increasing score values) (S543).

The calculating of the score value may include calculating an absolute value of a difference between one element of the own vehicle driving information and one element of the other vehicle driving information corresponding thereto, and calculating the mode (MOD) with the absolute value as a predetermined value. Multiplying a predetermined weight value by the MOD calculated value, and calculating a score value of another vehicle by summing each element value multiplied by the weight value. Detailed description thereof has been described above with reference to FIGS. 3 and 4, and thus, further description thereof will be omitted.

In this way, when the relay vehicle is determined by the relay vehicle calculating unit 341, a relay vehicle list is generated and managed based on the relay vehicle (S550).

However, since the driving environment of the own vehicle and the other vehicle can be changed, it is preferable that the relay vehicle list is updated with the change of the basic information or every periodic time.

To this end, when the Hello message manager 320 receives a Hello message of another new vehicle or the driving information manager 310 changes and updates the driving information of its own vehicle, the changed information is transmitted to the relay manager 340. . The relay vehicle information update unit 343 of the relay manager 340 checks whether the changed information is received (S560), and when the changed information is received, re-determines the relay vehicle based on the changed information to update the relay vehicle list. The changed vehicle information and the relay vehicle re-decision request are transmitted to the vehicle calculating unit 341 to update the relay vehicle list (S565).

7 is a flowchart illustrating a method for transferring information between vehicles according to the present invention.

As shown in FIG. 7, steps S510 to S565 are the same as described above with reference to FIGS. 5 and 6, and thus detailed descriptions of steps S510 to S565 are omitted.

As described above, the steps of generating and updating the relay vehicle list and maintaining the information on the relay vehicle and generating or receiving the information message and transmitting the information message to the relay vehicle will be described in detail below.

The information message is generated by the information message manager 330 or received from another vehicle.

In this case, the information message may include at least one of emergency information, accident information, road information, traffic progress information, weather information, and combinations thereof, and may include various information. In addition, the information message may include vehicle identification information of the vehicle that transmitted the information message, and preferably includes transmission hop number information for wireless multi-hop communication.

That is, the information message manager 330 confirms whether the sensing information is received from the sensor 200 (S570), and generates a message when the sensing information is received (generation of an information event) (S575).

Alternatively, the information message manager 330 checks whether there is an information message received from another vehicle (S580), and if there is a received information message, corrects the own vehicle identification information and the number of transmission hops included in the information message. The information message is corrected or reconfigured (S585).

The information message thus modified or reconstructed is transmitted to the relay vehicle maintained in the relay vehicle list (S590).

In addition to generating or receiving the information message and transmitting the information message to another vehicle as described above, the method may further include displaying the information message generated or transmitted from the other vehicle to the driver.

That is, the controller 300 controls the display unit 500 to receive an information message transmitted from another vehicle, interpret the received information message, and display the received information message. Alternatively, the control unit 300 controls the display unit 500 to the user to the information message generated based on the sensor information collected through the sensor unit 200.

As mentioned above, although this invention was demonstrated in detail with reference to attached drawing, this is only an illustration, It is clear that various deformation | transformation and a change are possible within the scope of the technical idea of this invention. Therefore, the protection scope of the present invention should not be limited to the above-described embodiment but should be defined by the description of the claims below.

1 is a block diagram of a vehicle-to-vehicle information transmission device according to the present invention.

2 is a block diagram of a relay management unit according to FIG. 1.

3 is a view showing a driving situation according to a preferred embodiment of the present invention.

4 is a diagram illustrating a process of determining and updating a relay vehicle according to a score value determination method.

5 is a flowchart of a method for determining a relay vehicle according to the present invention.

6 is a flow chart showing the detailed steps of the relay vehicle determination step according to FIG.

7 is a flow chart of the information transmission method between vehicles according to the present invention.

<Description of symbols for major symbols in the drawings>

100: driving information collection unit 110: GPS module

120: speedometer device 130: acceleration sensor

200: sensor unit 210: temperature sensor

220: image sensor 230: shock sensor

300: control unit 310: driving information management unit

320: Hello message management unit 330: Information message management unit

340: relay management unit 341: relay vehicle calculation unit

341-1: Speed calculator 341-2: Relative distance calculator

341-3: Azimuth calculator 341-4: Acceleration calculator

341-5: score calculation unit 342: relay vehicle information storage unit

343: relay vehicle information update unit 400: communication unit

500: display unit 510: voice processing unit

520: driving information display unit 530: message display unit

Claims (14)

In the method for determining a relay vehicle for information transmission in the Ed Hoc network composed of a plurality of vehicles, A Hello message sending step of collecting driving information of the own vehicle and generating and transmitting a Hello message including the collected driving information; A Hello message receiving step of receiving a Hello message sent by another vehicle; And A relay vehicle determining step of determining, as the relay vehicle, another vehicle having a similar driving situation with the own vehicle based on the received Hello message and the own vehicle driving information; Relay vehicle determination method comprising a. The method of claim 1, wherein the driving information, Comprising at least one of vehicle position, velocity, acceleration, azimuth information and combined information thereof Repeated vehicle determination method, characterized in that. The method of claim 2, wherein the determining of the relay vehicle, Detecting driving information of another vehicle from the received Hello message; Calculating a score value of the other vehicle based on a difference between each element of the own vehicle driving information and each element of the other vehicle driving information corresponding thereto; And Determining as many relay vehicles as a relay vehicle based on the size of the score value; Relay vehicle determination method comprising a. The method of claim 3, wherein the calculating of the score value comprises: Calculating an absolute value of a difference between one element of the own vehicle driving information and one element of the other vehicle driving information corresponding thereto; Mode (MOD) calculating the absolute value to a predetermined value; Multiplying a weighted value by the mode (MOD) calculated value; and Determining the score value of the other vehicle by summing each element value multiplied by the weight value. Relay vehicle determination method comprising a. The method according to any one of claims 1 to 4, A relay vehicle list management step of generating and managing a relay vehicle list based on the determined relay vehicle. Relay vehicle determination method further comprising. The method of claim 5, If a change occurs in the driving information or the Hello message, the relay vehicle updating step of re-determining the relay vehicle based on the changed value and reflecting the change in the relay vehicle list Relay vehicle determination method further comprising. In a method for transferring information between vehicles in an ed hoc network composed of a plurality of vehicles, A Hello message sending step of collecting driving information of the own vehicle and generating and transmitting a Hello message including the collected driving information; A relay vehicle determining step of determining, as a relay vehicle, a predetermined number of other vehicles having similar driving conditions with the own vehicle based on a Hello message sent by another vehicle and the own vehicle driving information; And Information message transmission step of transmitting the information message to the determined relay vehicle Inter-vehicle information transmission method comprising a. The method of claim 7, wherein the relay vehicle determining step, Detecting driving information of another vehicle from a Hello message sent by the other vehicle; Calculating an absolute value of a difference between one element of the own vehicle driving information and one element of the other vehicle driving information corresponding thereto, and calculating a mode (MOD) of the absolute value to a predetermined value and multiplying a predetermined weight value step; And Calculating a score value of the other vehicle by adding the multiplied value of the weight value, and determining a predetermined number of other vehicles having a large score value as a relay vehicle. Inter-vehicle information transmission method comprising a. The method of claim 7, wherein the information message, And at least one of emergency information, accident information, road information, traffic progress information, weather information, and combinations thereof, and further comprising vehicle identification information and hop count information. Inter-vehicle information transfer method characterized in that. 10. The method of claim 9, Modifying the hop number information of the information message received from the other vehicle, reconstructing the information message, and retransmitting the reconstructed information message to the relay vehicle Between-vehicle information transfer method further comprising a. The method of claim 7, wherein Receiving the information message from the other vehicle and displaying the information Between-vehicle information transfer method further comprising a. In the vehicle information transmission device constituting the Ed hok network with a plurality of vehicles, A driving information manager to collect driving information of the vehicle; A Hello message manager for generating a Hello message to include the driving information and controlling the communication unit to transmit and receive the Hello message; A relay manager configured to determine, as a relay vehicle, a predetermined number of other vehicles having similar driving conditions based on the Hello message received from another vehicle and the driving information; And An information message manager for controlling a communication unit to transmit an information message to the relay vehicle Inter-vehicle information transmission device comprising a. The method of claim 12, wherein the relay management unit, A relay vehicle calculator configured to determine, as a relay vehicle, a predetermined number of other vehicles having a small difference between the driving information of the other vehicle and the own vehicle driving information included in the received Hello message; And Relay vehicle information storage unit for storing the information of the determined relay vehicle Inter-vehicle information transmission device comprising a. The relay management unit according to any one of claims 12 to 13, wherein Repeated vehicle information updating unit for re-determining the relay vehicle based on the changed value when the driving information or the Hello message is changed Inter-vehicle information transmission device further comprises.

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