KR20090062275A - Method and system for transmitting and receiving warning message - Google Patents

Abstract

A warning message transmitting and receiving method and system are provided to avoid warning message collision between relay vehicles and reduce vehicle clash accident by transmitting a warning message from a vehicle which discovered a dangerous situation, to rear vehicles through multi-hop communications between vehicles. When road or external dangerous situation has occurred, one or more relay vehicle is selected by using a vehicle distance and vehicle condition information(S520). A warning message sequence message is increased(S530). A warning message including an identifier of a relay vehicle and a retransmission time is generated and transmitted(S540).

Description

METHOD AND SYSTEM FOR TRANSMITTING AND RECEIVING WARNING MESSAGE}

The present invention relates to a method and system for sending and receiving warning messages, and more particularly, to a method and system for sending and receiving warning messages so as to quickly notify a neighboring hop of a dangerous situation occurring on a road.

The present invention is derived from a study conducted as part of the IT source technology development project of the Ministry of Information and Communication and the Ministry of Information and Communication Research and Development (Task Management No .: 2007-F-039-01, Task Name: VMC Technology Development).

In general, when a dangerous situation occurs on the road, the warning message is notified to inform the dangerous situation of the dangerous situation. Instead of maintaining information on the relay vehicle to which the warning message is transmitted, it is located at the radio communication distance boundary when the dangerous situation occurs. Select a vehicle to broadcast the warning message.

Although this method of alert message broadcasting reduces the complexity of network operation, it is not suitable for the method of transmitting and receiving warning messages requiring promptness by spending a lot of time in selecting a relay vehicle to deliver the warning message, and also an accident occurs in the tunnel. If you do not have a disadvantage.

In another warning message broadcasting method, all vehicles maintain position information about all vehicles in the vicinity of the radio communication distance, and when an accident occurs, an arbitrary position within a radio wave radius is set as a threshold value and is located before the threshold value. There is a method of selecting a relay vehicle through competition between the vehicles.

The warning message transmission / reception method through competition between the vehicles sets the retransmission time in inverse proportion to the distance between the sender of the warning message and the receiver receiving the warning message.

Thus, the vehicle farthest from the sender within the threshold has the opportunity to relay retransmissions fastest. In addition, since a vehicle located at the same boundary distance can send a warning message at the same time, a message collision may occur, and as a result, there is a problem that a lot of delay occurs when sending a warning message.

An object of the present invention is to solve the above-mentioned disadvantages or problems, and to provide a warning message transmission / reception method for promptly notifying a neighboring hop of a dangerous situation occurring on a road.

The present invention also provides a warning message to a rear vehicle by using a multi-hop communication between vehicles when a vehicle that detects a dangerous situation when a dangerous situation occurs on the road can be used even in a tunnel, and a warning message between relay vehicles. The aim is to reduce collisions by reducing the possibility of collisions by delivering warning messages quickly and accurately.

In order to solve this problem, according to the present invention, a warning message is promptly delivered when a dangerous situation occurs on the road through the designation of a plurality of relay vehicles in the vehicle network. In this case, the present invention designates a plurality of vehicles as relay vehicles in advance, thereby delivering a very fast and reliable warning message to the neighboring hops.

In other words, the present invention solves the transmission delay of the warning message by simultaneously selecting one or more relay vehicles on the road and avoiding a retransmission collision of the warning messages between the selected relay vehicles, and at the same time the vehicle selected as the relay vehicle. This warning message can be quickly delivered to neighboring hops to reduce the risk of personal injury from a crash. Here, since the present invention selects relay vehicles and manages relay vehicles before an accident occurs, a warning message can be quickly delivered to a neighbor hop by using information of the relay vehicles managed when the accident occurs.

According to one aspect of the present invention, in the method for transmitting a warning message when a dangerous situation occurs on the road and outside, at least one relay vehicle is selected using distance between vehicles and vehicle status information when a dangerous situation occurs on the road and outside. And generating an alert message including an identifier of the relay vehicle and a retransmission time and increasing the alert message sequence number.

Here, the warning message sequence number is a number that is incremented each time the warning message is transmitted to avoid duplication of the warning message.

The warning message transmitting method may include: setting one or more relay vehicles to deliver the warning message to a neighboring hop before the dangerous situation occurs, and relaying the set relay vehicle when the dangerous situation occurs. The method may further include selecting the vehicle.

The warning message transmission method may further include receiving location information from a location center, receiving location information from surrounding vehicles, and using the location information of the surrounding vehicle with the surrounding vehicles based on the location information of the surrounding vehicle. The method may further include calculating a distance, classifying the surrounding vehicles by directions, and managing a table in which distances with the surrounding vehicles are ordered for each direction.

In this case, the managing of the table maintains and manages an order table in the same direction in which the surrounding vehicles are arranged in sequence based on distance and vehicle state information of the surrounding vehicles in the same direction as the self. In the selecting of the relay vehicle, one or more rear vehicles may be selected as the relay vehicle using the sequence table. In the selecting of the relay vehicle, one or more front vehicles may be selected as the relay vehicle using the sequence table.

Here, the warning message includes information on its vehicle identifier, the direction of movement of the warning message transmitting vehicle, the warning message sequence number, a message type, a relay vehicle identifier, and a retransmission time.

According to another aspect of the present invention, in the method for receiving a warning message when a dangerous situation occurs on the road and outside, receiving a warning message from a surrounding vehicle, checking the message sequence number in the warning message to duplicate the same warning message Checking whether the received warning message is repeated; if the same warning message is not received repeatedly, checking the relay vehicle identifier in the warning message to determine whether the relay vehicle is a relay vehicle; And setting a transmission timer and rebroadcasting the warning message to a neighbor hop when the warning message retransmission timer is timed out.

The warning message transmission method further includes ignoring the warning message when the warning message is not the relay vehicle.

In the warning message transmission method, if the same warning message is repeatedly received, confirming whether the relay vehicle is a relay vehicle by checking the relay vehicle identifier in the warning message, and in the case of the relay vehicle, re-entering the warning message. Deleting the transmission timer.

The warning message transmission method may further include waiting until the warning message is retransmitted to the neighboring hop based on the retransmission time in the warning message.

According to still another aspect of the present invention, in a system for transmitting and receiving a warning message when a dangerous situation occurs on the road and outside, a vehicle position receiving unit for receiving its location information from a positioning center, and a dangerous situation notification signal when a dangerous situation occurs Danger situation detector to generate, distance between the vehicle calculates the distance between the vehicle based on the location information received from the vehicle location receiving unit and the location information received from the surrounding vehicles, Danger from the dangerous situation detection unit Relay vehicle selection unit for selecting a vehicle for relaying a warning message by receiving a status notification signal, a storage unit for storing the identifier of the relay vehicle, the distance and the vehicle with the surrounding vehicles calculated by the distance between the vehicle calculation unit Vehicle order management unit arranged in order according to the state, and positioning from the surrounding vehicles It provides a warning message transmission and reception system including a communication device for receiving a beam, and generates and transmits a warning message including the identifier and retransmission time of the relay vehicle selected by the relay vehicle selection unit.

Here, the storage device stores the distance between the surrounding vehicles calculated by the distance between vehicles, the vehicle order arranged by the vehicle order management unit, the identifiers of the surrounding vehicles, the state of the surrounding vehicles.

The relay vehicle selecting unit selects the relay vehicle by using the distance between the surrounding vehicles and the state information of the surrounding vehicles calculated by the distance calculation unit.

The communication device transmits the location information received by the vehicle location receiving unit to the surrounding vehicles, applies the location information received from the surrounding vehicles to the inter-vehicle distance calculating unit, and the relay selected by the relay vehicle selecting unit. Generates a warning message including the vehicle's identifier and retransmission time and sends it to the surrounding vehicles. After receiving the warning message from the surrounding vehicles and confirming that the vehicle is a relay vehicle, the retransmission start timer is driven to restart the retransmission within the warning message. The warning message is retransmitted to the neighbor hops based on the transmission time, and upon receiving the warning message re-sent from another relay vehicle, the retransmission start timer is deleted and the warning message is not resent.

As described above, according to the present invention, when a dangerous situation occurs on the road, by solving the delay of the warning message, a vehicle selected as a relay vehicle quickly delivers the warning message to the neighboring hops, thereby reducing the casualty caused by the collision accident, It can also be used when an accident occurs in a tunnel.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art may easily implement the present invention. As those skilled in the art would realize, the described embodiments may be modified in various different ways, all without departing from the spirit or scope of the present invention. In the drawings, parts irrelevant to the description are omitted in order to clearly describe the present invention, and like reference numerals designate like parts throughout the specification.

Throughout the specification, when a part is said to "include" a certain component, it means that it can further include other components, without excluding other components unless specifically stated otherwise. In addition, the terms “… unit”, “… unit”, “… module” described in the specification mean a unit that processes at least one function or operation, which may be implemented by hardware or software or a combination of hardware and software. Can be.

Now, a method and system for transmitting and receiving a warning message according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings.

In the warning message transmission / reception system according to an exemplary embodiment of the present invention, in order to quickly transmit a dangerous situation occurring on a road to a neighboring hop, one relay vehicle that delivers a warning message to a neighboring hop before a dangerous condition occurs on the road is generated. With the above settings, the distance between the vehicles is calculated based on their location information and the location information of the vehicles around them, the vehicles are classified by directions, and the vehicle is separated from the vehicles in the same direction. Maintain an order table in the same direction in which neighboring vehicles are arranged in sequence based on distance and vehicle state information.

The warning message transmission / reception system according to an embodiment of the present invention uses one or more rear relay vehicles by using a sequence table in the same direction maintained by the vehicle that has discovered a dangerous situation when a dangerous situation occurs on the road. And broadcast the relay vehicle identifier and retransmission time together in a warning message to inform the rear vehicle that a dangerous situation has occurred in front of the vehicle, and at the same time, the vehicle selected as the relay vehicle can quickly deliver the warning message to the neighboring hops. At the same time, it is confirmed that another vehicle has already relayed the warning message, so that the relay vehicles give up their relay rights to avoid retransmission collisions between the relay vehicles. Accordingly, it is possible to solve the delay in the transmission of the warning message in the event of a dangerous situation on the road.

In other words, every vehicle receives its location information from the positioning center and broadcasts its location information to nearby vehicles before a dangerous situation occurs on the roadway. Accordingly, each vehicle maintains and manages a table that orders the distances of the surrounding vehicles for each direction.

Then, the vehicle that detects the accident broadcasts a warning message containing the relay vehicle ID and the retransmission start time to the rear vehicle. Accordingly, the vehicle receiving the warning message checks whether the vehicle ID is included in the warning message.

At this time, the vehicles whose vehicle ID matches the vehicle ID in the warning message wait until the warning message is retransmitted to the neighboring hops based on the start time of retransmission of the warning message for each vehicle in the warning message. The vehicle with faster retransmission time broadcasts the warning message to the neighbor hops.

Accordingly, the vehicle receiving the retransmitted warning message deletes its retransmission start timer and does not retransmit the warning message.

As described above, since at least one relay vehicle is set in advance and the relay vehicles are managed before the accident occurs, the relay vehicle is quickly selected by using the relay vehicle information managed at the time of the accident. Alert messages can be forwarded to neighbor hops. In addition, an embodiment of the present invention by retransmitting the warning message based on the start time of the retransmission of the warning message for each relay vehicle, to avoid retransmission collision between the relay vehicles, to solve the delay of delivery of the warning message, Accordingly, a vehicle selected as a relay vehicle can quickly send a warning message to neighboring hops, thereby reducing the casualty caused by the crash.

Alternatively, the warning message transmission and reception system according to an embodiment of the present invention, when an emergency vehicle, such as a hospital vehicle or firefighting vehicle proceeds, selects one or more forward relay vehicles using an order table in the same direction maintained by the vehicle. And broadcast the relay vehicle identifier and retransmission time in a warning message to inform the front vehicle that there is an emergency vehicle, and at the same time, the vehicle selected as the relay vehicle quickly delivers the warning message to the neighboring hop, After confirming that the warning message has been relayed, the remaining relay vehicles give up their relay rights to avoid retransmission collisions between the relay vehicles so as to resolve the delay of the warning message.

1 is a block diagram illustrating an overall concept of an alert message transmission and reception system according to an embodiment of the present invention.

Here, in order to help the understanding of the present invention and for convenience of description, two vehicles, that is, the third vehicle 103 and the fifth vehicle 105, are selected as the relay vehicle in FIG. 1, and the fifth relay vehicle 105 located at the end. An example having a retransmission start time that can start earlier than the third relay vehicle 103 located in the middle will be described in more detail. In addition, FIG. 1 shows an example in which two propagation areas 108 and 109 and the first vehicle 101 located in front transmit a warning message to neighboring vehicles through broadcast.

First, all the vehicles 101 to 107 receive their own location information from the positioning center. And before a dangerous situation on the road, each of the vehicle (101 ~ 107) each transmits its location information through the broadcast to the surrounding vehicles. Accordingly, each of the vehicles 101 to 107 maintains and manages a table in which the distances of the surrounding vehicles are ordered for each direction.

Then, when a dangerous situation occurs on the road, the first vehicle 101, which first found the vehicle 111 in which the accident occurred, sends a warning message M1 to M4 containing a relay vehicle ID and a retransmission start time. Broadcast to 102 (105).

Accordingly, each of the rear vehicles 102 to 105 that receive the warning messages M1 to M4 from the dangerous situation detecting vehicle, that is, the first vehicle 101, has its own vehicle ID corresponding to the warning messages M1 to M4. Check each is inside.

At this time, the vehicles 103 and 105 whose vehicle IDs match the vehicle IDs in the warning messages M1 to M4 recognize that they are relay vehicles and drive a retransmission start timer that they have. Based on the vehicle-specific warning message retransmission start time included in the warning messages M2 and M4, the warning message M5 to M7 is waited until the time to retransmit to the neighboring hop 108.

And the relay vehicle having a faster retransmission time, that is, the fifth vehicle 105 broadcasts the warning message (M5 ~ M7) to the neighbor hop 108. At this time, the rear vehicles 106 and 107 located in the neighboring hops 108 receive the warning messages M5 to M7 retransmitted from the fifth vehicle 105.

On the other hand, the other relay vehicle, that is, the third vehicle 103, which has received the warning message M8 retransmitted from the fifth vehicle 105, deletes the retransmission start timer which it has, and re-issues the warning message. Do not send.

2 is a block diagram illustrating a warning message transmission and reception system according to an embodiment of the present invention.

Warning message transmission and reception system according to an embodiment of the present invention, a communication system used in a vehicle, as shown in Figure 2, the vehicle location receiving unit 200, dangerous situation detection unit 210, storage unit 220 , An inter-vehicle distance calculating unit 230, a relay vehicle selecting unit 240, a vehicle order managing unit 250, and a communication device unit 260.

The vehicle location receiving unit 200 receives vehicle location information (ie, its own location information) from the positioning center, and transmits its own vehicle location information between the vehicle distance calculating unit 230 and the communication device unit 260. Is applied.

The dangerous situation detection unit 210 detects a dangerous situation on the road and outside, generates a dangerous situation notification signal for notifying that the dangerous situation has occurred, and applies it to the relay vehicle selecting unit 240.

The storage unit 220 stores an identifier for the relay vehicle selected by the relay vehicle selecting unit 240. In addition, the storage unit 220 stores the distance between neighboring vehicles calculated by the inter-vehicle distance calculating unit 230, stores the vehicle order table arranged by the vehicle order managing unit 250, and stores the communication device unit ( The identifier of the neighboring vehicle applied through the 260 is stored, and the state of the neighboring vehicle applied through the communication device unit 260 is stored.

The inter-vehicle distance calculating unit 230 calculates a distance between neighboring vehicles based on its own vehicle position information applied from the vehicle position receiving unit 200 and position information received from the neighboring vehicle through the communication device unit 260. The calculated distance from the neighboring vehicles is applied to the storage device 220 and the vehicle order manager 250.

The relay vehicle selector 240 relays a warning message using distance and vehicle status information of neighboring vehicles managed by the vehicle sequence manager 250 according to a dangerous situation notification signal applied from the dangerous situation detector 210. Select a vehicle and apply the identifier of the selected relay vehicle to the communication device unit 260. In addition, the relay vehicle selecting unit 240 stores the information on the relay vehicle identifier in the storage unit 220.

The vehicle order managing unit 250 arranges the tables in order according to the distance between the neighboring vehicles and the state of the vehicle applied from the inter-vehicle distance calculating unit 230, and stores a table in which the distances of the surrounding vehicles are ordered for each direction. 220, stored and maintained.

The communication device unit 260 transmits its own vehicle position information applied from the vehicle position receiving unit 200 to the surrounding vehicles, receives the position information from the surrounding vehicles, and applies the position information to the inter-vehicle distance calculating unit 230, and relays it. The vehicle selecting unit 240 generates a warning message containing the relay vehicle identifier selected and the retransmission start time, transmits the warning message to the surrounding vehicles, receives the warning message from the surrounding vehicle, checks whether the relay vehicle is the relay vehicle, and then starts retransmission. Run the timer to resend the warning message to the neighbor hops based on the start time of retransmission of the warning message for each vehicle in the received warning message, and start the retransmission start timer when the warning message is received from another relay vehicle. Delete it and do not resend the warning message.

In addition, the communication device 260 may include a message receiver 261 for receiving a message from a neighboring vehicle, a message processor 262 for processing a message received through the message receiver 261, and a message processed by the message processor 262. It includes a message transmitter 263 for transmitting to a neighboring vehicle.

3 is a diagram illustrating a format of a warning message according to an embodiment of the present invention.

As shown in FIG. 3, the field constituting the warning message according to an embodiment of the present invention may include a vehicle identifier field 300 indicating a vehicle identifier of the vehicle, and a vehicle direction field indicating a moving direction of the vehicle transmitting the message. 310, a message sequence number field 320 that is incremented each time the sending vehicle sends a message to avoid duplication of the warning message, a message type field 330 indicating the type of message, a relay vehicle that will forward the warning message to the neighboring hops; Relay vehicle identifier fields 340, 360, and 370 indicating the identifier of the reconstruction start time fields 350, 360, and 380 indicating the retransmission start time for each relay vehicle.

4 is a diagram illustrating a neighbor vehicle information database provided in a storage unit according to an exemplary embodiment of the present invention.

As shown in FIG. 4, the neighbor vehicle information database provided in the storage unit according to an exemplary embodiment of the present invention includes a vehicle order field 400 indicating a vehicle order and a vehicle identifier field for storing identifiers of neighboring vehicles. 410, a relative distance field 420 indicating a relative distance between its own vehicle and a neighboring vehicle, and a vehicle state field 430 storing a state of the vehicle.

Hereinafter, a method of transmitting and receiving an alert message according to an exemplary embodiment of the present invention will be described in detail with reference to the flowcharts of FIGS. 5 and 6.

5 is a flowchart illustrating a warning message transmission method according to an exemplary embodiment of the present invention. 6 is a flowchart illustrating a warning message receiving method according to an exemplary embodiment of the present invention.

First, a processing flow related to a vehicle for transmitting a warning message in a warning message transmission / reception system according to an exemplary embodiment of the present invention will be described with reference to FIG. 5.

When a dangerous situation occurs on the road and outside, the dangerous situation detection unit 210 detects the dangerous situation on the road and the outside (S510), and generates a dangerous situation notification signal for notifying that the dangerous situation has occurred, thereby relaying the vehicle. Authorized by the government 240 to request the relay vehicle selection unit 240 to broadcast a warning message.

Accordingly, the relay vehicle selecting unit 240 receives a dangerous situation notification signal from the dangerous situation detecting unit 210 and relays a warning message using the distance between the vehicles and the vehicle state information managed by the vehicle order managing unit 250. After selecting at least one vehicle (S520), the identifier of the selected relay vehicle is applied to the communication device unit 260 to request the message processing unit 262 in the communication device unit 260 to generate a warning message. do.

Accordingly, after the message processing unit 262 increases the warning message sequence number (S530) and generates a warning message containing the relay vehicle identifier selected by the relay vehicle selecting unit 240 and the retransmission start time (S540), The generated warning message is broadcasted through the message transmitter 263 in the communication device unit 260 (S550). Here, the warning message sequence number is a number that is incremented each time the message processing unit 262 sends a warning message to avoid duplication of the warning message.

Second, a processing flow related to a vehicle receiving a warning message in a warning message transmission / reception system according to an exemplary embodiment of the present invention will be described with reference to FIG. 6.

The message receiving unit 261 in the communication device unit 260 receives the warning message from the neighboring vehicle (S610), compares the message sequence number field included in the received warning message, and confirms whether the same warning message has been repeatedly received ( S620).

Accordingly, when it is determined that the same warning message is repeatedly received in step S620, the relay vehicle identifier field included in the received warning message is compared to determine whether the current vehicle is a relay vehicle (S630).

Accordingly, when it is determined in step S630 that the vehicle is the relay vehicle, the warning message retransmission timer held by the vehicle is deleted (S640). In addition, if it is determined in step S630 that the vehicle is not a relay vehicle, the received warning message is ignored. Here, the warning message retransmission timer performs a role of counting the start time of retransmission of the warning message for each relay vehicle so as to retransmit the warning message when the counted time expires.

On the other hand, if it is determined that the same warning message has been repeatedly received in step S620, the relay vehicle identifier field included in the received warning message is compared to determine whether the current vehicle is a relay vehicle (S650).

Then, in step S630, if the vehicle is the relay vehicle, a warning message retransmission timer held by the vehicle is set (S660). In addition, in step S630, if the vehicle is not the relay vehicle, the received warning message is ignored.

Therefore, after checking whether the warning message retransmission timer set in step S660 described above has timed out (S670), when the warning message retransmission timer has timed out, it means that the vehicle has been selected as a relaying warning message. In step S680, the warning message is rebroadcast to the neighbor node.

In the above, the embodiment of the present invention has been described for re-broadcasting the warning message by selecting one or more relay vehicles.

However, embodiments of the present invention are not implemented only through the above-described apparatus and / or method, but implemented through a program for realizing a function corresponding to the configuration of the embodiment of the present invention, a recording medium on which the program is recorded, and the like. Such an implementation may be easily implemented by those skilled in the art to which the present disclosure pertains based on the description of the above-described embodiments.

Although the embodiments of the present invention have been described in detail above, the scope of the present invention is not limited thereto, and various modifications and improvements of those skilled in the art using the basic concepts of the present invention defined in the following claims are also provided. It belongs to the scope of rights.

1 is an overall conceptual diagram of a warning message transmission and reception system according to an embodiment of the present invention.

2 is a block diagram illustrating a warning message transmission and reception system according to an embodiment of the present invention.

3 is a diagram illustrating a format of a warning message according to an embodiment of the present invention.

4 is a diagram illustrating a neighbor vehicle information database provided in a storage unit according to an exemplary embodiment of the present invention.

5 is a flowchart illustrating a warning message transmission method according to an exemplary embodiment of the present invention.

6 is a flowchart illustrating a warning message receiving method according to an exemplary embodiment of the present invention.

Claims (16)

A method of transmitting a warning message when a dangerous situation occurs on the road and outside, Selecting at least one relay vehicle using distance between vehicles and vehicle status information in case of danger on the road and outside; and Incrementing an alert message sequence number and generating and transmitting an alert message including an identifier of the relay vehicle and a retransmission time; Alert message transmission method comprising a. The method of claim 1, The warning message sequence number is And a number that is incremented each time the alert message is sent to avoid duplication of the alert message. The method of claim 1, Presetting at least one relay vehicle to deliver the warning message to a neighboring hop before the dangerous situation occurs, and Selecting the relay vehicle as the relay vehicle when the dangerous situation occurs; Alert message transmission method further comprising. The method of claim 1, Receiving own location information from the positioning center, Receiving location information from nearby vehicles, Calculating a distance between neighboring vehicles based on the location information of the vehicle and the location information of the surrounding vehicle; Classifying the surrounding vehicles by directions, and Managing a table in which distances with the surrounding vehicles are ordered for each direction; Alert message transmission method further comprising. The method of claim 4, wherein Managing the table, And maintaining and managing an order table in the same direction in which the neighboring vehicles are arranged in sequence based on distance and vehicle state information with the surrounding vehicles in the same direction as the self. The method of claim 5, Selecting the relay vehicle, And transmitting at least one rear vehicle as the relay vehicle using the sequence table. The method of claim 5, Selecting the relay vehicle, And transmitting at least one forward vehicle as the relay vehicle using the sequence table. The method of claim 1, The warning message, And a vehicle identifier of the vehicle, the direction of movement of the warning message transmission vehicle, the warning message sequence number, a message type, a relay vehicle identifier, and information on a retransmission time. A method of receiving a warning message when a dangerous situation occurs on the road and outside, Receiving a warning message from a nearby vehicle, Confirming whether the same warning message has been repeatedly received by checking the message sequence number in the warning message; If the same warning message is not received in duplicate, confirming whether the relay vehicle is a relay vehicle by checking the relay vehicle identifier in the warning message, Setting a warning message retransmission timer in the case of the relay vehicle; and Rebroadcasting the warning message to a neighbor hop if the warning message retransmission timer times out Alert message transmission method comprising a. The method of claim 9, And disregarding the warning message when the vehicle is not the relay vehicle. The method of claim 9, If the same warning message is repeatedly received, checking whether the relay vehicle is a relay vehicle by checking a relay vehicle identifier in the warning message, and In the case of the relay vehicle, deleting the warning message retransmission timer. Alert message transmission method further comprising. The method of claim 9, In the case of the relay vehicle, the method further comprises waiting until a time for retransmitting the warning message to a neighboring hop based on the retransmission time in the warning message. In the system for transmitting and receiving a warning message when a dangerous situation occurs on the road and outside, Vehicle location receiving unit for receiving its location information from the positioning center, Hazard situation detection unit that generates a hazard notification signal when a dangerous situation occurs, An inter-vehicle distance calculator configured to calculate distances between neighboring vehicles based on the positional information received by the vehicle position receiver and positional information received from surrounding vehicles; A relay vehicle selecting unit configured to select a vehicle for relaying a warning message by receiving a dangerous situation notification signal from the dangerous situation detecting unit; A storage unit which stores an identifier of the relay vehicle; A vehicle sequence management unit arranged in order according to the distance from the surrounding vehicles and the vehicle state calculated by the distance between vehicles; and A communication device unit for receiving location information from the surrounding vehicles, generating and transmitting a warning message including an identifier and a retransmission time of the relay vehicle selected by the relay vehicle selecting unit. Alert message transmission and reception system comprising a. The method of claim 13, The storage unit, And a warning message transmitting / receiving system for storing a distance from surrounding vehicles calculated by the distance between vehicles, a vehicle order arranged by the vehicle order managing unit, identifiers of surrounding vehicles, and states of surrounding vehicles. The method of claim 13, The relay vehicle selection unit, And a warning message transmission / reception system for selecting the relay vehicle using the distance between the surrounding vehicles and the state information of the surrounding vehicles calculated by the distance between vehicles. The method of claim 13, The communication device unit, The vehicle transmits the position information received by the vehicle position receiving unit to surrounding vehicles, applies the position information received from the surrounding vehicles to the inter-vehicle distance calculating unit, and transmits the identifier and retransmission of the relay vehicle selected by the relay vehicle selecting unit. Generates a warning message including the time and sends it to the surrounding vehicles. After receiving the warning message from the surrounding vehicles and confirming that the vehicle is a relay vehicle, a retransmission start timer is started to warn the user based on the retransmission time in the warning message. A warning message transmission and reception system that retransmits a message to a neighbor hop and deletes the retransmission start timer and does not retransmit the warning message when a warning message is received from another relay vehicle.

Images