KR20190082500A - Method for transming data between vehicle and vehicle, apparatus and system for executing the method - Google Patents

Abstract

Disclosed are an inter-vehicle data communication method to increase reliability in inter-vehicle communications and an apparatus and a system for executing the same. According to the present invention, the inter-vehicle data communication method comprises the following steps: selecting a captain vehicle; selecting one or more receiver vehicles among other vehicles; measuring the distance between the captain and receiver vehicles; comparing the measured distance with at least one from a preset minimum threshold distance and a preset maximum threshold distance; and setting a data transmission rate with the receiver vehicle based on a comparison result.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of communicating data between vehicles and an apparatus and system for performing the same,

Embodiments of the present invention relate to a method for communicating data between vehicles and an apparatus and a system for performing the same.

Vehicle communication technology can be broadly classified into Vehicle-to-Infrastructure (V2I), which is a communication between a vehicle and a base station, and Vehicle-to-Vehicle (V2V), which is a communication between a vehicle and a vehicle.

V2I can be used for multimedia service such as map and internet to driver. Also, the V2I technique can be used not only for the vehicle to receive information from the base station, but also for transmitting the information of the vehicle via the base station to a server connected to the base station.

V2V can be used for the purpose of convenience or safety of the driver by constructing his own network without the help of communication infrastructure.

However, common inter-vehicle communication often involves handoffs. As a result, it may not be easy for the inter-vehicle communication connection to remain seamless. As a result, the reliability of inter-vehicle communication can be reduced. Therefore, it is required to reduce the frequency of the handoff of the vehicle-to-vehicle communication or to reduce the time during which the communication between the vehicles is interrupted, thereby improving the reliability of the vehicle-to-vehicle communication. To this end, attempts have been made to select a suitable vehicle among a plurality of vehicles as a vehicle on which communication is to be performed. However, choosing the right vehicle did not improve the reliability sufficiently. Accordingly, there is a need for another way to reduce the frequency of handoff of inter-vehicle communication or to reduce the time that inter-vehicle communication is interrupted.

Korean Patent Registration No. 10-1751899 (June 27, 2017)

It is an object of the present invention to provide an inter-vehicle data communication method with improved reliability and an apparatus and system for performing the method.

An inter-vehicular data communication method according to an embodiment of the present invention is a method for inter-vehicle data communication, comprising: a computing device having one or more processors and a memory for storing one or more programs executed by the one or more processors The method comprising the steps of: receiving a captain designation signal and selecting the captain designation signal as a captain vehicle; selecting one or more receiver vehicles among the other vehicles by the captain vehicle communicating with other vehicles around the captain vehicle; Comparing the measured distance with at least one of a predetermined minimum threshold distance and a maximum threshold distance, and comparing the measured distance with at least one of a predetermined minimum threshold distance and a maximum threshold distance based on the comparison result. And sets a data transmission rate with the receiver vehicle .

Wherein the step of selecting as the captain vehicle includes broadcasting the beacon signal by the captain vehicle, receiving the captain designation signal from the communication device that has received the beacon signal, A beacon signal is received from a plurality of vehicles including a captain vehicle, a vehicle having the strongest beacon signal strength is selected as a captain vehicle, and the captain designation signal is transmitted to the captain vehicle.

Wherein the step of selecting the receiver vehicle comprises receiving the beacon signal broadcast by the captain vehicle from other vehicles around the captain vehicle, checking the strength of each beacon signal received by the captain vehicle, And selecting one or more receiver vehicles of other vehicles around the captain's vehicle according to the strength of the captain vehicle.

Wherein the comparing step comprises the steps of: checking whether the measured distance is less than or equal to the predetermined minimum threshold distance; and setting the data transmission rate to a first predetermined data transmission rate if the measured distance is less than or equal to the predetermined minimum threshold distance .

Determining whether or not the measured distance is less than or equal to the preset minimum threshold distance, if the measured distance exceeds the preset minimum threshold distance, if the measured distance is less than the predetermined maximum threshold distance And setting the data rate to a second data rate lower than the first data rate if the measured distance is less than the predetermined maximum threshold distance.

Determining whether the measured distance is less than the predefined maximum threshold distance, and if the measured distance is greater than or equal to the predetermined maximum threshold distance, determining the data rate to be a third data rate lower than the second data rate As shown in FIG.

An inter-vehicle data communication method according to another embodiment of the present invention is a method for inter-vehicle data communication, comprising the steps of: The method comprising the steps of: receiving a captain designation signal and selecting the captain designation signal as a captain vehicle; selecting one or more receiver vehicles among the other vehicles by the captain vehicle communicating with other vehicles around the captain vehicle; The captain vehicle communicates with the receiver vehicles at a predetermined initial data rate to receive a beacon signal from the receiver vehicles, the captain vehicle checks the strength of each received beacon signal, Calculating a number of vehicles having a critical intensity or higher, Comparing the number of the vehicle calculated by the number of the previous period of the vehicle and submitted according to the comparison result comprises the steps of: updating a data transmission rate of said receiver vehicle.

A computing device according to another embodiment of the present invention is a computing device having one or more processors and a memory for storing one or more programs executed by the one or more processors, A communication unit that communicates with other vehicles in the vicinity to select at least one receiver vehicle of the other vehicles and measures a distance between the selected receiver vehicle and a communication unit that measures the distance between the predetermined minimum threshold distance and the maximum threshold distance And an analyzing unit comparing the at least one data with the receiver vehicle and setting a data transmission rate with the receiver vehicle based on the comparison result.

Wherein the communication unit broadcasts a beacon signal and receives the caption designation signal from the communication apparatus that has received the beacon signal, and the communication apparatus transmits a beacon signal from a plurality of vehicles including the captain vehicle having the communication unit And selects the vehicle having the strongest beacon signal strength as the received captain vehicle, and transmits the captain designation signal to the captain vehicle.

The communication unit receives a beacon signal broadcasted from other vehicles in the vicinity, checks the strength of each received beacon signal, and selects one or more receiver vehicles of other vehicles in the vicinity according to the intensity of the beacon signal .

The analyzer may check whether the measured distance is less than or equal to the predetermined minimum threshold distance, and may set the data rate to a predetermined first data rate when the measured distance is less than the predetermined minimum threshold distance.

Wherein the analyzing unit checks whether the measured distance is less than or equal to the predetermined minimum threshold distance, and if the measured distance exceeds the predetermined minimum threshold distance, the measured distance is less than the predetermined maximum threshold distance And if the measured distance is less than the predetermined maximum threshold distance, the data rate can be set to a second data rate lower than the first data rate.

Wherein the analyzing unit determines the data rate to be lower than the second data rate if the measured distance is equal to or greater than the predetermined maximum threshold distance after confirming whether the measured distance is less than the predetermined maximum threshold distance 3 data transmission rate.

A computing device according to another embodiment of the present invention is a computing device having one or more processors and a memory for storing one or more programs executed by the one or more processors, A communication unit communicating with other vehicles in the vicinity to select one or more receiver vehicles of the other vehicles, communicating with the predetermined receiver vehicles at a predetermined initial data rate and receiving a beacon signal from the receiver vehicles, The method comprising the steps of: calculating a number of vehicles having an intensity of a beacon signal equal to or greater than a predetermined threshold intensity by checking the intensity of each received beacon signal; comparing the number of vehicles calculated and the number of vehicles calculated in a previous cycle; An analysis unit for updating the data transmission rate with the receiver vehicle .

According to another aspect of the present invention, an intervehicle data communication system includes a plurality of vehicles that periodically broadcast a beacon signal, and a plurality of vehicles that receive the beacon signal, And a communication device for selecting one of the plurality of vehicles as a captain car and transmitting a captain designation signal to the selected captain car, wherein the captain car communicates with other cars around the captain car And the distance between the captain vehicle and the receiver vehicle is measured, and the measured distance is compared with predetermined minimum critical distance and maximum critical distance, respectively, And sets a data transmission rate with the receiver vehicle.

According to another aspect of the present invention, an intervehicle data communication system includes a plurality of vehicles that periodically broadcast a beacon signal, and a plurality of vehicles that receive the beacon signal, And a communication device for selecting one of the plurality of vehicles as a captain car and transmitting a captain designation signal to the selected captain car, wherein the captain car communicates with other cars around the captain car And receives a beacon signal from the receiver vehicles by communicating with the receiver vehicles at a predetermined initial data rate to check the strength of each received beacon signal to determine a beacon signal, Calculating a number of vehicles whose intensity of a signal is equal to or greater than a predetermined threshold intensity, Compares the number of vehicles with the number of vehicles calculated in the previous period, and updates the data rate with the receiver vehicle according to the comparison result.

Effects of the inter-vehicle data communication method according to the present invention and the apparatus and system for performing the method will be described below.

According to the disclosed embodiment, it is possible to control the data transmission rate of the vehicle in the communication between the vehicles, to reduce the frequency of the handoff of the vehicle communication, or to reduce the time during which the communication between the vehicles is stopped, The reliability of the inter-communication can be improved.

1 is a schematic diagram for understanding vehicle-to-vehicle communication as a background of the present invention;
2 is a diagram showing a vehicle-to-vehicle data communication system according to an embodiment of the present invention;
3 is a flowchart illustrating a method for communicating data between vehicles according to an embodiment of the present invention
4 is a flowchart for explaining the logic of a method for communicating data between vehicles according to an embodiment of the present invention.
5 is a flowchart illustrating a method for communicating data between vehicles according to another embodiment of the present invention
6 is a flowchart for explaining the logic of a method for communicating data between vehicles according to another embodiment of the present invention.
7 is a view for explaining an inter-vehicular data communication apparatus (a computing apparatus) for performing a method of data communication between vehicles according to an embodiment of the present invention;
8 is a block diagram illustrating and illustrating a computing environment 10 including a computing device suitable for use in the exemplary embodiments.

Hereinafter, specific embodiments of the present invention will be described with reference to the drawings. The following detailed description is provided to provide a comprehensive understanding of the methods, apparatus, and / or systems described herein. However, this is merely an example and the present invention is not limited thereto.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the following description, well-known functions or constructions are not described in detail since they would obscure the invention in unnecessary detail. The following terms are defined in consideration of the functions of the present invention, and may be changed according to the intention or custom of the user, the operator, and the like. Therefore, the definition should be based on the contents throughout this specification. The terms used in the detailed description are intended only to describe embodiments of the invention and should in no way be limiting. Unless specifically stated otherwise, the singular form of a term includes plural forms of meaning. In this description, the expressions "comprising" or "comprising" are intended to indicate certain features, numbers, steps, operations, elements, parts or combinations thereof, Should not be construed to preclude the presence or possibility of other features, numbers, steps, operations, elements, portions or combinations thereof.

In the following description, terms such as " transmission ", "transmission "," transmission ", "reception ", and the like, of a signal or information refer not only to the direct transmission of signals or information from one component to another But also through other components. In particular, "transmitting" or "transmitting" a signal or information to an element is indicative of the final destination of the signal or information and not a direct destination. This is the same for "reception" of a signal or information. Also, in this specification, the fact that two or more pieces of data or information are "related" means that when one piece of data (or information) is acquired, at least a part of the other data (or information) can be obtained based thereon.

On the other hand, directional terms such as the top, bottom, one side, the other, and the like are used in connection with the orientation of the disclosed figures. Since the elements of the embodiments of the present invention can be positioned in various orientations, directional terms are used for illustrative purposes and not limitation.

Also, the terms first, second, etc. may be used to describe various components, but the components should not be limited by the terms. The terms may be used for the purpose of distinguishing one component from another. For example, without departing from the scope of the present invention, the first component may be referred to as a second component, and similarly, the second component may also be referred to as a first component.

1 is a schematic diagram for understanding vehicle-to-vehicle communication as a background of the present invention.

1, each vehicle 103 and 104 may generally include a vehicle network system 310, an on-board diagnostic 320, and a wireless communication module 330.

The in-vehicle network system 310 may be a controller area network. The in-vehicle network system 310 can provide digital serial communication between various measurement control equipments of the vehicle. The vehicle network system 310 may acquire information on the state of the vehicle from various device devices included in the vehicle and transmit the information to the on-board diagnostic device 320.

The on-board diagnostics 320 may be on-board diagnostics. The onboard diagnostic device 320 can receive vehicle status information indicating the status of the vehicle from the in-vehicle network system 310. [ The received vehicle status information can be stored in the interior of the vehicle. However, the present invention is not limited to this, and the vehicle status information may be transmitted to and stored in the cloud outside the vehicle through the communication network.

The wireless communication module 330 may periodically transmit vehicle status information regarding the status of the vehicle 103 stored in the onboard diagnostic device 320 to the other vehicle 104 as a beacon signal through the communication network. In some embodiments, the communication network includes an Internet, one or more local area networks, a wire area networks, a cellular network, a mobile network, other types of networks, or a combination of such networks can do.

The other vehicle 104 can receive information on the state of the vehicle 103 from the vehicle 103. [ Other vehicles 104, such as vehicle 103, may also transmit data to vehicle 103 and other vehicles.

2 is a diagram illustrating an inter-vehicle data communication system according to an embodiment of the present invention.

2, an intervehicular data communication system may be one which communicates with the vehicle 103 and surrounding vehicles 104 (including the vehicle 104) using the communication unit 120 of the vehicle 103. [ The communication unit 120 may include a wireless communication module such as a cellular communication module, a Wi-Fi module, and the like.

An access point (AP) 102 may designate one of the surrounding vehicles as a captain vehicle 103. For example, the access point 102 may designate as the captain vehicle 103 a vehicle that broadcasts the beacon signal most strongly among surrounding vehicles.

Prior to describing the beacon signal, a beacon may be a device provided in a mobile body such as an aircraft, a ship, or an automobile and periodically transmitting and receiving a radio wave signal including various information including a position with a terrestrial radio base station and the like. The beacon signal includes an SSID (service set identifier) which is a unique identifier of the vehicle 103 or 104, a Cell ID which is an identifier of the communication unit of the vehicle 103 or 104, various current states of the vehicle 103 or 104, The signal transmission power of the vehicle 103 or 104, the signal supporting transmission rate of the vehicle 103 or 104, and the like.

Vehicles 103 and 104 may periodically broadcast a beacon signal. The captain vehicle 103 may sense a beacon signal broadcast from a plurality of other vehicles. The captain vehicle 103 can determine whether or not the other vehicle 104 can be connected according to the intensity of the detected beacon signal. A method of detecting the strength of a beacon signal may be a signal strength measurement. The captain vehicle 103 can select the receiver vehicle 104 among a plurality of other vehicles based on the detected beacon signals. The captain vehicle 103 can communicate with the receiver vehicle 104.

The captain vehicle 103 may control the data rate R with the receiver vehicle 104 to reduce the frequency of frequent hand-offs of communication. The captain vehicle 103 can control the data transmission rate R for the receiver vehicle 104 depending on the number of other vehicles in the vicinity. A detailed description thereof will be given later with reference to FIG. 5 and FIG. The captain vehicle 103 may also control the data transmission rate R for the receiver vehicle 104 along the distance the receiver vehicle 104 is away from the captain vehicle 103. [ A detailed description thereof will also be described later with reference to FIG. 3 and FIG.

3 is a flowchart illustrating a method for communicating data between vehicles according to an embodiment of the present invention. In the illustrated flowchart, the method is described as being divided into a plurality of steps, but at least some of the steps may be performed in sequence, combined with other steps, performed together, omitted, divided into sub-steps, One or more steps may be added and performed.

Referring to Fig. 3, the captain vehicle 103 can control the data transfer rate R for each of a plurality of different vehicles, depending on the distance from the captain vehicle 103. Fig.

First, a captain vehicle can be selected among a plurality of vehicles around the infrastructure of the infrastructure (S102). The infrastructure is a communication device (for example, a gateway, an access point, and the like) provided on the road side to form a communication between the vehicle and the base station so that the vehicle can communicate with the base station. For example, the communication device may be installed in an infrastructure 102 such as a street side street lamp or a pole, but the present invention is not limited thereto.

The details are as follows. The infrastructure 102 may sense the strength of the beacon signal broadcast by each of the plurality of vehicles 103 and 104, etc., in the vicinity. The infrastructure 102 may select the captain vehicle 103 among a plurality of surrounding vehicles 103 and 104 etc. according to the strength of the received signals. For example, the infrastructure 102 may select a vehicle that broadcasts strong beacon signals among the receiving beacon signals to the captain vehicle 103. Infrastructure 102 may send a captain designation signal to a selected captain vehicle 103.

Next, the captain vehicle 103 may sense a beacon signal broadcast from a plurality of other vehicles. The captain vehicle 103 can determine whether or not the other vehicle 104 can be connected according to the intensity of the detected beacon signal. The captain vehicle 103 may select the receiver vehicle 104 among a plurality of other vehicles based on the detected beacon signals (S202).

Captain vehicle 103 may obtain an initial distance (D ₀₎ the spacing between selected vehicle receiver 104 and connect, and Captain vehicle 103 and the vehicle receiver 104 (S302). The obtained initial distance D ₀ can be compared with the predetermined minimum threshold distance D ₁ and the maximum threshold distance D ₂ (S402).

Next, the captain vehicle 103 determines whether or not the captain vehicle 103 is in a state in which the captain vehicle 103 is moving, based on the comparison result with the minimum threshold distance D ₁ and the maximum threshold distance D ₂ of the obtained initial distance D ₀ , The initial data transmission rate R ₀ of the base station 103 can be determined (S502). The determinable data transfer rate may be one of a predetermined first data transfer rate (high data transfer rate, R _H ), a second data transfer rate (medium data transfer rate, R _M ) and a third data transfer rate (low data transfer rate, R _L ) . Captain vehicle 103 may communicate with the initial data transmission rate (R ₀₎ with respect to the vehicle receiver 104.

Next, the captain vehicle 103 can acquire the current distance D _T , which is spaced apart from the receiver vehicle 104, at every cycle, while moving (S602). The obtained current distance D _T can be compared with the predetermined minimum threshold distance D ₁ and the maximum critical distance D ₂ (S702).

Next, the captain vehicle 103 determines whether or not the captain vehicle 103, based on the result of the comparison with the minimum threshold distance D ₁ and the maximum threshold distance D ₂ of the obtained current distance D _T , A new data transmission rate of the mobile station 103 can be determined (S802). Accordingly, the current data transfer rate for the receiver vehicle 104 of the captain vehicle 103 can be adjusted to the determined new data transfer rate (S902).

4 is a flowchart illustrating the logic of a method for communicating data between vehicles according to an embodiment of the present invention. In the illustrated flow chart, the method is described as being divided into a plurality of steps, but at least some of the steps may be performed in reverse order, combined with other steps, performed together, omitted, divided into detailed steps, One or more steps may be added and performed.

Referring to Fig. 4, the captain vehicle 103 can control the current data transfer rate R for the vehicle in accordance with the distance change from the captain vehicle for each of a plurality of other vehicles.

First, the Captain vehicle 103 may obtain an initial distance (D ₀₎ the spacing between selected vehicle receiver 104 and connect, and Captain vehicle 103 and the vehicle receiver 104. The obtained initial distance D ₀ can be compared with the predetermined minimum threshold distance D ₁ and the maximum threshold distance D ₂ (S402). Next, the captain vehicle 103 determines whether or not the captain vehicle 103 is in a state in which the captain vehicle 103 is moving, based on the comparison result with the minimum threshold distance D ₁ and the maximum threshold distance D ₂ of the obtained initial distance D ₀ , (R ₀ ) of the base station 103 can be determined. The determinable data transfer rate may be one of a predetermined first data transfer rate (high data transfer rate, R _H ), a second data transfer rate (medium data transfer rate, R _M ) and a third data transfer rate (low data transfer rate, R _L ) . A detailed explanation is as follows.

First, the initial distance (D ₀₎ can be a determination whether the threshold below the minimum distance (D ₁₎ (S412). If the initial distance D ₀ is equal to or less than the minimum threshold distance D ₁ , the initial data transmission rate R ₀ may be set to a predetermined first data transmission rate (high data rate, R _H ) (S512).

The captain vehicle 103, the receiver vehicle 104, and a number of other vehicles all move at similar speeds, and therefore, even if the time varies, the probability that the distance between the vehicles will change is low. Therefore, the initial distance D ₀ between the captain vehicle 103 and the receiver vehicle 104 is equal to or less than the minimum critical distance D ₁ because the possibility that the receiver vehicle 104 can maintain a close distance thereafter It is preferable to communicate with the receiver vehicle 104 at a high data transmission rate.

If the initial distance (D ₀₎ is greater than the minimum threshold distance (D _1), the initial distance (D ₀₎ is greater than the minimum threshold distance (D _1), and whether or not it belongs to a range less than a maximum threshold distance (D ₂₎ (S422). The initial distance (D ₀₎ if the belong to the range, the initial data transmission rate (R ₀₎ may be set to a (data rate, R _M of the) second data rate preset (S55).

The initial distance (D ₀₎ is not included in the range, the receiver vehicle 104 since due to a high possibility to maintain an appropriate distance (or, in the next cycle), is in communication with a suitable data transmission rate with the receiver vehicle 104 It is enough.

If the initial distance D ₀ does not fall within the range, it can be determined that the initial distance D ₀ is _{equal to} or larger than the maximum critical distance D ₂ . If the initial distance D ₀ is equal to or greater than the maximum threshold distance D ₂ , the initial data rate R ₀ may be set to a predetermined third data rate (low data rate, R _L ) (S532).

The reason why the initial distance D ₀ is equal to or larger than the maximum critical distance D ₂ is that there is a high possibility that the receiver vehicle 104 will maintain a long distance thereafter (or next period) It is preferable to perform communication with the base station 104 at a low data rate.

Depending on the setting of the initial data transmission rate (R ₀₎ as above, Captain vehicle 103 (S502) may communicate with the vehicle receiver 104.

Next, the captain vehicle 103 can acquire the current distance D _T , which is spaced apart from the receiver vehicle 104, at every cycle, while moving (S602). The obtained current distance D _T can be compared with the predetermined minimum threshold distance D ₁ and the maximum critical distance D ₂ (S702).

Next, the captain vehicle 103 obtains, based on the result of the comparison with the minimum threshold distance D ₁ and the maximum threshold distance D ₂ of the obtained current distance DT, 103 can be determined.

The process of comparing the current distance D _T with the minimum threshold distance D ₁ and the maximum threshold distance D ₂ is performed by comparing the initial distance D ₀ described above with the minimum threshold distance D ₁ and the maximum threshold distance D ₂ ), which will be explained briefly.

First, it may be determined whether the current distance D _T is equal to or less than the minimum threshold distance D ₁ (S 712). If the current distance D _T is less than or equal to the minimum threshold distance D ₁ , the new data rate may be determined to be a predetermined first data rate (high data rate, R _H ) (S 812).

If the current distance D _T exceeds the minimum threshold distance D ₁ or whether the current distance D _T exceeds the minimum threshold distance D ₁ and falls within a range below the maximum threshold distance D ₂ (S722). If the current distance D _T falls within the range, the new data transmission rate may be determined as a predetermined second data transmission rate (R _M ) (S822).

If the current distance D _T does not fall within the range, it can be determined that the current distance D _T is greater than or equal to the maximum critical distance D ₂ . If the current distance D _T is equal to or greater than the maximum threshold distance D ₂ , the new data rate may be determined as a predetermined third data rate (low data rate, R _L ) (S 832).

In accordance with the setting of the new data rate as described above, the current data rate of the captain vehicle 103 with respect to the receiver vehicle 104 can be adjusted to the determined new data rate (S902).

Thereafter, from the step of acquiring the current distance DT separated from the receiver vehicle 104 at every cycle while the current cycle is set to the previous cycle, the next cycle is set to the current cycle, and the captain vehicle 103 moves , The subsequent steps may be repeated.

In accordance with the above-described flow, the data transmission rate for the receiver vehicle 104 of the captain vehicle 103 can be adjusted. Further, such adjustment of the data rate may be repeated until the start of the captain vehicle 103 is turned off.

By applying the data transmission rate differentially according to the distance between the captain vehicle and the receiver vehicle in the above manner, if the captain vehicle implements the same data transmission capability, the connection with the nearest vehicle can be maintained. Thus, the frequency of occurrence of the handoff of the captain vehicle itself can be reduced.

5 is a flowchart illustrating a method for communicating data between vehicles according to another embodiment of the present invention. In the illustrated flowchart, the method is described as being divided into a plurality of steps, but at least some of the steps may be performed in sequence, combined with other steps, performed together, omitted, divided into sub-steps, One or more steps may be added and performed.

Referring to Fig. 5, the captain vehicle 103 can control the data transmission rate R for the receiver vehicle 104, depending on the number of surrounding vehicles.

First, a captain vehicle can be selected among a plurality of vehicles around the infrastructure of the infrastructure (S101). Next, the captain vehicle 103 can select the receiver vehicle 104 among a plurality of other vehicles based on the beacon signals sensed from the plurality of other vehicles (S201). Captain vehicle 103 may communicate with selected vehicle receiver 104 and connect, and predetermined with respect to vehicle receiver 104, the initial data transmission rate (R ₀₎ (S301). Next, the captain vehicle 103 senses a beacon signal broadcast from a plurality of other vehicles at every cycle, while moving, and stores the detected beacon signals (S401). The above steps are the same as the description of FIG. 3 and are duplicated, so a detailed description thereof will be omitted.

Next, the captain vehicle 103 may calculate the number N _{T of} vehicles having the intensity of the beacon signal that is detected at the threshold intensity P _R or higher among the previously received beacon signals (S501). The calculated number N _T of vehicles can be compared with the number of vehicles N _T-1 of the previous period (S601). The number N _T-1 of vehicles in the previous period may be the number of vehicles whose intensity of the detected beacon signal detected during the beacon signals received in the previous period is equal to or greater than the threshold strength P _R.

Next, the captain's vehicle 103 is the number of vehicles (N _T) and the number of vehicles in the preceding period (N _T-1) on the basis of the comparison result, Captain vehicle 103 for the receiver vehicle 104 A new data transmission rate can be calculated (S701). Accordingly, the current data transfer rate for the receiver vehicle 104 of the captain vehicle 103 can be adjusted to the calculated new data transfer rate (S801).

6 is a flowchart illustrating the logic of a method for communicating data between vehicles according to another embodiment of the present invention. In the illustrated flow chart, the method is described as being divided into a plurality of steps, but at least some of the steps may be performed in reverse order, combined with other steps, performed together, omitted, divided into detailed steps, One or more steps may be added and performed.

Referring to FIG. 6, the captain vehicle 103 can control the current data transfer rate R for a plurality of different vehicles in accordance with the number of other vehicles in the vicinity of the captain vehicle 103. FIG.

First, the captain vehicle 103 senses a beacon signal broadcast from a plurality of other vehicles at every cycle while moving, and stores the detected beacon signals (S401).

Next, the captain vehicle 103 may calculate the number N _{T of} vehicles having the intensity of the beacon signal that is detected at the threshold intensity P _R or higher among the previously received beacon signals (S501).

The calculated number of vehicles (NT) can be compared with the number of vehicles (N _T-1 ) of the previous cycle. The number N _T-1 of vehicles in the previous period may be the number of vehicles whose intensity of the detected beacon signal detected during the beacon signals received in the previous period is equal to or greater than the threshold strength P _R. Next, the captain's vehicle 103 is the number of vehicles (N _T) and the number of vehicles in the preceding period (N _T-1) on the basis of the comparison result, Captain vehicle 103 for the receiver vehicle 104 A new data transmission rate can be calculated. A detailed explanation is as follows.

First, there is the same whether or not the number of the car number of the previous cycle of the vehicle and the _{(N T) (N T-} 1) may be determined (S611). If the number of vehicle number of the vehicle from the previous period and the _{(N T) (N T-} 1) are the same, the new data rate may be set to maintain the transmission rate (R _T-1) of the previous period (S811) .

It is same as the current cycle number of connectable vehicles determined in _(T) (N T) the number of connectable vehicles previously determined period _{(T-1) (N T} -1), that there is no change in the peripheral communication connection environment Meaning that there is no need to change the data rate.

Thereafter, the following steps may be repeated from the time when the current cycle is set to the previous cycle, the next cycle is set to the current cycle, and the captain vehicle 103 senses a beacon signal broadcast from a plurality of other vehicles.

The number of vehicle number of the vehicle from the previous period and the (N _T) when (N _T-1) are different, the number of vehicles (N _T) is whether increased number of vehicles in the preceding period (N _T-1) if Can be determined. If the number of vehicles (N _T) is increased greater than the number of the vehicle from the previous period (N _T-1), new data rate may be set to decrease to less than the previous cycle data rate (R _T-1).

If there is a large number of vehicles connectable to the periphery determined in the present cycle T as compared with the previous cycle T-1, even if the connection with the currently connected receiver vehicle 104 is broken, . Thus, the interruption of the communication connection can be prevented. Therefore, the beacon signal can be transmitted / received at a low data rate, minimizing the damage of the data frame, and thus, the beacon signal can be continuously transmitted / received with high reliability.

The reduced data rate R- can be compared with a predetermined minimum data rate R _MIN . If the reduced data rate R- is less than or equal to the minimum data rate R _MIN , then the initial data rate R ₀ may be set to a new data rate. This is to prevent a case where the number of the plurality of other vehicles connectable to the periphery is sharply reduced.

Thereafter, the following steps may be repeated from the time when the current cycle is set to the previous cycle, the next cycle is set to the current cycle, and the captain vehicle 103 senses a beacon signal broadcast from a plurality of other vehicles. In addition, even if the reduced data transmission rate R- is greater than the minimum data transmission rate R _MIN , the current period is set to the previous period and the next period is set to the current period, From the step of sensing the beacon signal broadcast from the base station, the following steps can be repeated.

Determines that the number of vehicles (N _T) is lower than the previous cycle number of the vehicle if it is not higher than (N _T-1), the number of vehicles (N _T) the number of vehicles in the preceding period (N _T-1) . If the number of vehicles (N _T ) does not increase beyond the number of vehicles (N _T-1 ) of the previous period, then the new data rate may be set to increase above the data rate (R _T-1 ) of the previous period .

If there are fewer vehicles connectable to the periphery determined in the present cycle T than the previous cycle T-1, if the connection with the currently connected receiver vehicle 104 is broken, I can not. Accordingly, a fast data rate is required to transmit and receive rapidly changing vehicle information without missing, before communication with the connected receiver vehicle 104 is interrupted.

The increased data transmission rate (R +) can be compared with a predetermined maximum data transmission rate (R _MAX ). If the increased data rate R + is greater than or equal to the maximum data rate R _MAX , then the maximum data rate R _MAX can be set to a new data rate. This is for data transmission and reception of high continuity and high reliability when the number of other vehicles that can be connected to the surroundings continuously is small.

Thereafter, the following steps may be repeated from the time when the current cycle is set to the previous cycle, the next cycle is set to the current cycle, and the captain vehicle 103 senses a beacon signal broadcast from a plurality of other vehicles. Also, even when the increased data rate R + is less than the maximum data rate R _MAX , the current cycle is set to the previous cycle, and the next cycle is set to the current cycle so that the captain vehicle 103 From the step of detecting the broadcast beacon signal, the following steps can be repeated.

In accordance with the above-described flow, the data transmission rate for the receiver vehicle 104 of the captain vehicle 103 can be adjusted. Further, such adjustment of the data rate may be repeated until the start of the captain vehicle 103 is turned off.

By changing the data transmission rate according to the number of receiver vehicles communicably connected to the captain vehicle in the above manner, the captain vehicle can reduce the data loss occurring during the occurrence of the handoff even if the handoff occurs.

7 is a view for explaining an inter-vehicular data communication apparatus (a computing apparatus) for performing a method of data communication between vehicles according to an embodiment of the present invention.

7, the inter-vehicle data communication apparatus 100 provided in the cap-top vehicle 103 may include a storage unit 110, a communication unit 120, an analysis unit 130, and a change unit 140 .

The storage unit 110 may receive vehicle status information indicating the status of the vehicle from on-board diagnostics. The vehicle status information can be collected by a travel record self-diagnostic device through a controller area network that provides digital serial communication between various instrumentation control devices of the vehicle. In addition, the storage unit 110 may store a beacon signal including various parameter sets such as SSID, Cell ID, current state, transmission power, and supported transmission rate, which are unique identifiers of the vehicle received through the communication unit 120. [

The communication unit 120 periodically transmits vehicle status information as a beacon signal to the receiver vehicle 104 via the communication network according to a predetermined transmission rate. The details are as follows. The communication unit 120 may include a wireless communication module such as a cellular communication module, a Wi-Fi module, and the like. The communication unit 120 may sense a beacon signal broadcasted from a plurality of other vehicles in the vicinity. When there are connectable beacon signals among the beacon signals to be detected, the communication unit 120 can communicate with the corresponding vehicle as the receiver vehicle 104. [

The analyzer 130 may calculate a new data rate for the receiver vehicle 104 of the captain vehicle 103, depending on the distance the receiver vehicle 104 is away from the captain vehicle 103 . A detailed description thereof is also the same as the description of FIG. 3 and FIG. 4, and thus duplicates are omitted.

In another embodiment, the analysis unit 130 may calculate a new data transfer rate for the receiver vehicle 104 of the captain vehicle 103, depending on the number of other vehicles in the vicinity. The detailed description thereof is the same as the description of FIG. 5 and FIG. 6, and thus duplicate description will be omitted.

The changing unit 140 may adjust the current data rate to a new data rate. The modifying unit 140 may adjust the data rate by the following three methods.

First, there may be a way to modulate the modulation scheme. The changing unit 140 may change the modulation scheme from a low level modulation scheme to a high level modulation scheme in order to increase the data rate. Also, the changing unit 140 may change the modulation scheme from the high-level modulation scheme to the low-level modulation scheme in order to reduce the data rate.

Second, in a fixed environment where the modulation scheme can not be changed, there may be a way to change the data rate in the Wi-Fi module itself.

Thirdly, there may be a method of changing the transmission period of the data accumulated in the storage unit 110. Information obtained from OBD (On-Board Diagnostics) can be continuously accumulated in the storage unit 110, and the amount of beacon signals transmitted through the communication unit 120 can be the same. Accordingly, the data transmission rate can be changed by changing the transmission period of the data accumulated in the storage unit 1100.

Specifically, when the number of vehicles connectable to the periphery is large, the changing unit 140 may transmit a smaller amount of data during the same time by lengthening the transmission period (i.e., reducing the number of data transmissions during the same time) have. The transmission of less data over the same time period may indicate a decrease in the data rate.

On the other hand, if the number of vehicles connectable to the periphery is small, the changing unit 140 may shorten the transmission period (i.e., increase the number of data transmissions during the same time) to transmit more data for the same time have. The transmission of more data over the same time period may indicate an increase in the data rate.

8 is a block diagram illustrating and illustrating a computing environment 10 that includes a computing device suitable for use in the exemplary embodiments. In the illustrated embodiment, each of the components may have different functions and capabilities than those described below, and may include additional components in addition to those described below.

The illustrated computing environment 10 includes a computing device 12. In one embodiment, the computing device 12 may be an intervehicle data communication device (e.g., intervehicle data communication device 100 of FIG. 7).

The computing device 12 includes at least one processor 14, a computer readable storage medium 16, The processor 14 may cause the computing device 12 to operate in accordance with the exemplary embodiment discussed above. For example, processor 14 may execute one or more programs stored on computer readable storage medium 16. The one or more programs may include one or more computer-executable instructions, which when executed by the processor 14 cause the computing device 12 to perform operations in accordance with the illustrative embodiment .

The computer-readable storage medium 16 is configured to store computer-executable instructions or program code, program data, and / or other suitable forms of information. The program 20 stored in the computer-readable storage medium 16 includes a set of instructions executable by the processor 14. In one embodiment, the computer-readable storage medium 16 may be any type of storage medium such as a memory (volatile memory such as random access memory, non-volatile memory, or any suitable combination thereof), one or more magnetic disk storage devices, Memory devices, or any other form of storage medium that can be accessed by the computing device 12 and store the desired information, or any suitable combination thereof.

Communication bus 18 interconnects various other components of computing device 12, including processor 14, computer readable storage medium 16.

The computing device 12 may also include one or more input / output interfaces 22 and one or more network communication interfaces 26 that provide an interface for one or more input / output devices 24. The input / output interface 22 and the network communication interface 26 are connected to the communication bus 18. The input / output device 24 may be connected to other components of the computing device 12 via the input / output interface 22. The exemplary input and output device 24 may be any type of device, such as a pointing device (such as a mouse or trackpad), a keyboard, a touch input device (such as a touch pad or touch screen), a voice or sound input device, An input device, and / or an output device such as a display device, a printer, a speaker, and / or a network card. The exemplary input and output device 24 may be included within the computing device 12 as a component of the computing device 12 and may be coupled to the computing device 12 as a separate device distinct from the computing device 12 It is possible.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments, but, on the contrary, . Therefore, the scope of the present invention should not be limited to the above-described embodiments, but should be determined by equivalents to the appended claims, as well as the appended claims.

100: Inter-vehicle data communication device (computing device)
110:
120:
130:
140:
102: access point
103: Captain Car
104: receiver vehicle
310: Network system
320: On-board diagnostics
330: Wireless communication module

Claims (16)

A method for data communication between vehicles,
One or more processors, and
A method performed in a computing device having a memory storing one or more programs executed by the one or more processors,
Receiving a captain designation signal and selecting it as a captain vehicle;
Selecting one or more receiver vehicles of the other vehicles by the captain vehicle performing communication with other vehicles around the captain vehicle;
Measuring the distance between the captain vehicle and the receiver vehicle by communicating with the receiver vehicle;
Comparing the measured distance with at least one of predetermined minimum threshold distance and maximum threshold distance; And
And setting a data transmission rate with the receiver vehicle based on the comparison result.
The method according to claim 1,
The step of selecting the captain vehicle comprises:
Broadcasting the beacon signal by the captain vehicle; And
And receiving the captain designation signal from the communication device from which the captain vehicle has received the beacon signal,
The communication device receives a beacon signal from each of a plurality of vehicles including the captive vehicle, selects a vehicle having the strongest intensity of the received beacon signal as a captive vehicle, and transmits the captive specifying signal to the captive vehicle , A method of data communication between vehicles.
The method according to claim 1,
Wherein the step of selecting the receiver vehicle comprises:
Receiving the beacon signal broadcast by the captain vehicle from other vehicles around the captain vehicle; And
Checking the strength of each beacon signal received by the captain vehicle and selecting one or more receiver vehicles of other vehicles around the captain vehicle according to the intensity of the beacon signal.
The method according to claim 1,
Wherein the comparing comprises:
Determining whether the measured distance is less than or equal to the predetermined minimum threshold distance; And
And setting the data rate to a predetermined first data rate if the measured distance is less than the preset minimum threshold distance.
The method of claim 4,
After confirming whether the measured distance is less than or equal to the predetermined minimum threshold distance,
Determining whether the measured distance is less than the predetermined maximum threshold distance if the measured distance exceeds the predetermined minimum threshold distance; And
And setting the data rate to a second data rate lower than the first data rate if the measured distance is less than the predetermined maximum threshold distance.
The method of claim 5,
After confirming whether the measured distance is less than the predetermined maximum threshold distance,
And setting the data rate to a third data rate lower than the second data rate if the measured distance is greater than or equal to the preset maximum threshold distance.
A method for data communication between vehicles,
One or more processors, and
A method performed in a computing device having a memory storing one or more programs executed by the one or more processors,
Receiving a captain designation signal and selecting it as a captain vehicle;
Selecting one or more receiver vehicles of the other vehicles by the captain vehicle performing communication with other vehicles around the captain vehicle;
The captain vehicle communicating with the receiver vehicles at a predetermined initial data rate to receive a beacon signal from the receiver vehicles;
Checking the strength of each received beacon signal by the captain vehicle to calculate the number of vehicles whose beacon signal strength is equal to or greater than a predetermined threshold strength;
Comparing the number of the calculated vehicles with the number of vehicles calculated in the previous cycle; And
And updating the data transmission rate with the receiver vehicle according to the comparison result.
One or more processors, and
A computing device having a memory for storing one or more programs executed by the one or more processors,
A communication unit for receiving a captain designation signal from outside, selecting one or more receiver vehicles of the other vehicles by performing communication with other vehicles in the vicinity, and measuring a distance between the selected receiver vehicles; And
And an analyzing section for comparing the measured distance with at least one of a predetermined minimum threshold distance and a maximum threshold distance and setting a data transmission rate with the receiver vehicle based on the comparison result.
The method of claim 8,
Wherein,
Broadcast a beacon signal, receive the captain designation signal from a communication device that has received the beacon signal,
Wherein the communication device receives a beacon signal from each of a plurality of vehicles including a captain vehicle having the communication section, selects a vehicle having the strongest intensity of the received beacon signal as the captain vehicle, And transmits a designated signal.
The method of claim 8,
Wherein,
For receiving a beacon signal broadcast from other vehicles in the vicinity, for determining the strength of each received beacon signal, and for selecting one or more receiver vehicles of other vehicles in the vicinity according to the intensity of the beacon signal, .
The method of claim 8,
The analyzing unit,
Determines whether the measured distance is less than or equal to the predetermined minimum threshold distance and sets the data transmission rate to a predetermined first data transmission rate if the measured distance is less than or equal to the predetermined minimum threshold distance.
The method of claim 11,
The analyzing unit,
Determining whether the measured distance is less than the predetermined maximum threshold distance if the measured distance exceeds the predetermined minimum threshold distance after confirming whether the measured distance is less than the predetermined minimum threshold distance, Check,
And sets the data rate to a second data rate lower than the first data rate if the measured distance is less than the predetermined maximum threshold distance.
The method of claim 12,
The analyzing unit,
Determining whether the measured distance is less than the predefined maximum threshold distance, and if the measured distance is greater than or equal to the predetermined maximum threshold distance, determining the data rate to be a third data rate lower than the second data rate . ≪ / RTI >
One or more processors, and
A computing device having a memory for storing one or more programs executed by the one or more processors,
Receiving a captain designation signal from outside and communicating with other nearby vehicles to select one or more receiver vehicles of the other vehicles, communicating with the selected receiver vehicles at a predetermined initial data rate, A communication unit for receiving a beacon signal from the base station; And
The method comprising the steps of: calculating a number of vehicles having an intensity of a beacon signal equal to or greater than a predetermined threshold intensity by checking the intensity of each received beacon signal; comparing the number of vehicles calculated and the number of vehicles calculated in a previous cycle; And an analyzing unit that updates a data transmission rate with the receiver vehicle according to the data transmission rate.
A plurality of vehicles that periodically broadcast a beacon signal; And
And a controller for receiving the beacon signal from the plurality of vehicles, selecting one of the plurality of vehicles as a captain vehicle according to the intensity of the received beacon signal, and transmitting a captain designation signal to the selected captain vehicle The communication device comprising:
The captain vehicle includes:
Selecting one or more receiver vehicles of the other vehicles by performing communication with other vehicles around the captain vehicle, measuring a distance between the captain vehicle and the receiver vehicle, and transmitting the measured distance to a predetermined minimum critical distance and And sets a data transmission rate with the receiver vehicle based on the comparison result.
A plurality of vehicles that periodically broadcast a beacon signal; And
And a controller for receiving the beacon signal from the plurality of vehicles, selecting one of the plurality of vehicles as a captain vehicle according to the intensity of the received beacon signal, and transmitting a captain designation signal to the selected captain vehicle The communication device comprising:
The captain vehicle includes:
A communication unit for communicating with other vehicles around the captain vehicle to select one or more receiver vehicles of the other vehicles, communicating with the receiver vehicles at a predetermined initial data rate to receive a beacon signal from the receiver vehicles, The method comprising the steps of: calculating a number of vehicles having an intensity of a beacon signal equal to or greater than a predetermined threshold intensity by checking the intensity of each received beacon signal; comparing the number of vehicles calculated and the number of vehicles calculated in a previous cycle; And updates the data transmission rate with the receiver vehicle in accordance with the data transmission rate.

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