KR101317837B1 - Traffic management apparatus, rode side apparatus and method for maintaining state of communication - Google Patents

Abstract

A traffic management device, a roadside device, and a communication state maintaining method are disclosed. According to an embodiment of the present invention, a traffic management apparatus includes a communication unit performing data communication with a roadside device that collects traffic information of a vehicle entering a preset range, and traffic information from the roadside device within a predetermined threshold time through the communication unit. If is not received, and includes a control unit for transmitting a connection maintenance message to the roadside device to maintain a normal network state with the roadside device. Accordingly, data communication between the roadside device and the traffic management device can be performed smoothly.

Description

Traffic management apparatus, rode side apparatus and method for maintaining state of communication}

The present invention relates to a network device, and more particularly, to a method for maintaining a communication state between a traffic management device and a roadside device on a ubiquitous vehicle sensor network.

U-Transportation is a new transportation space that provides human-centered future transportation services and systems that contribute to stability and mobility by real-time networking of travelers, transportation facilities and transportation in the ubiquitous environment. To provide such a ubiquitous traffic environment, information related to traffic must be monitored in real time through the Ubiquitous Transportation Sensor Network so that it can be stored, analyzed and predicted quickly and safely.

In addition, in a ubiquitous traffic sensor network environment, while the vehicle moves at high speed, data communication between the vehicle and the vehicle, the vehicle and the roadside device, and the roadside device and the traffic management device should be performed smoothly. In particular, in such a ubiquitous traffic sensor network environment, data communication between a roadside device that collects traffic information from a vehicle terminal device of a vehicle and a traffic management device that receives traffic information collected from the roadside device and analyzes traffic conditions is performed. It should be done smoothly.

An object of the present invention is a data communication between a roadside device that collects traffic information through data communication with a vehicle terminal device of a vehicle in a traffic sensor network environment, and a traffic management device that receives traffic information collected from the roadside device and analyzes traffic conditions. The purpose is to make this smooth.

The above-described technical problem is achieved by the characteristic aspects of the present invention described later. The traffic management apparatus according to the present invention may perform a data communication with a roadside device that collects traffic information of a vehicle that has entered a predetermined range, and if the traffic information is not received from the roadside device within a predetermined threshold time through the communication unit. And a control unit for transmitting a connection maintenance message to the roadside device such that a normal network state with the roadside device is maintained.

The apparatus may further include a traffic information DB in which identification information of a plurality of roadside devices and traffic information received from at least one roadside device among the plurality of roadside devices are stored, and the controller may include a roadside device stored in the traffic information DB. Connection analysis by analyzing traffic information for each road, and searching for a roadside device that has not transmitted traffic information within the threshold time, and transmitting a connection maintenance message to the roadside device using identification information of the found roadside device. It may include wealth.

The controller may further include an initialization command unit configured to transmit an initialization command message to the roadside apparatus if a response message according to the connection maintenance message transmission is not received within a preset threshold time from the roadside apparatus.

If the connection request message is not received within a preset threshold time from the roadside device that transmitted the initialization command message, the connection maintaining unit may transmit a recovery request message for the roadside device to the manager terminal device.

On the other hand, according to another embodiment of the present invention for achieving the above object, in a method for maintaining a smooth data communication state with a roadside device for collecting traffic information of a vehicle in a traffic management device, the Checking whether traffic information is received from the roadside device, and if the traffic information is not received from the roadside device within the threshold time, maintaining connection to the roadside device using previously stored identification information of the roadside device. And maintaining a connection with the roadside device by performing an initialization of the operation of the roadside device according to the step of transmitting the message and whether the response message according to the transmission of the connection maintenance message is received from the roadside device.

The checking may include analyzing traffic information of the roadside device stored in the traffic information DB to check whether traffic information is received from the roadside device within the threshold time.

The maintaining of the connection with the roadside device may include checking whether a response message according to transmission of a connection maintenance message is received from the roadside device within the threshold time, and as a result of the check, not received within a preset threshold time. If not, the method may include transmitting an initialization command message to the roadside device.

In the maintaining of the connection with the roadside device, if a connection request message is not received within a preset threshold time from the roadside device that transmitted the initialization command message, a recovery request message for the roadside device is sent to the manager terminal device. The method may further include transmitting.

On the other hand, according to another embodiment of the present invention for achieving the above object, the first communication unit for transmitting and receiving traffic information-related data in a wireless manner with a vehicle terminal device of at least one vehicle entered into a predetermined communication range, traffic management A second communication unit for transmitting the traffic information received through the first communication unit through a wired data communication with a device, and the second communication unit according to whether the traffic information is transmitted to the traffic management device within a predetermined threshold time; And a control unit for transmitting and receiving a connection maintenance related message for maintaining a normal network state with the traffic management apparatus.

The control unit may include a connection performing unit that transmits a response message when a connection maintenance message is received from the traffic management apparatus.

In addition, when the recovery request message is received from the traffic management device, the access execution unit may initialize the roadside device operation and transmit the access request message to the traffic management device.

If the traffic information is not received within the threshold time through the first communication unit, the connection maintenance message is transmitted to the traffic management device through the second communication unit. If the response message is not received, the roadside device is transmitted. It may include a self-diagnostic unit that performs initialization for the operation.

On the other hand, according to another embodiment of the present invention for achieving the above object, a method for maintaining a smooth data communication state with the traffic management device in the roadside device for collecting the traffic information of the vehicle and transmits to the traffic management device Checking whether traffic information is received from a vehicle terminal device of at least one vehicle within a preset threshold time, and if the traffic information is not received within the threshold time, according to whether to set a self-test, the traffic management Sending or receiving a connection maintenance message with the device to maintain normal network conditions.

The maintaining of the network state may include transmitting a response message related to a connection maintenance message received from the traffic management apparatus if the self-diagnosis is not set.

The maintaining of the network state may include initializing an operation of the roadside apparatus when a recovery request message is received from the traffic management apparatus that has transmitted the response message. The method may further include transmitting a connection request message.

The maintaining of the network state may include transmitting a connection maintenance message to the traffic management apparatus when the self-diagnosis is set, and checking whether a response message is received from the traffic management apparatus that has transmitted the connection maintenance message. If a response message is not received as a result of the checking and the checking, the method may include initializing the roadside device operation, and then transmitting a connection request message to the traffic management device.

As described above, according to various embodiments of the present disclosure, by continuously transmitting and receiving a connection maintenance related message between the roadside device and the traffic management device, the network state between the roadside device and the traffic management device is determined, and the recovery is performed when the network is disconnected. For example, data communication between the roadside device and the traffic management device can be performed smoothly.

1 is an exemplary diagram of a ubiquitous traffic sensor network system according to an embodiment of the present invention;
2 is a block diagram showing a configuration of a traffic management apparatus according to an embodiment of the present invention;
3 is a block diagram of a roadside apparatus according to an embodiment of the present invention;
4 is a flowchart of a method for maintaining a data communication state with a roadside device in a traffic management device according to an embodiment of the present invention;
5 is a flowchart of a method for maintaining a normal connection state with a roadside device in an abnormally connected state in a traffic management apparatus according to an embodiment of the present invention;
6 is a flowchart of a method for maintaining a smooth data communication state with a traffic management apparatus in a roadside apparatus according to an embodiment of the present invention.

BRIEF DESCRIPTION OF THE DRAWINGS The foregoing and further aspects of the present invention will become more apparent from the following detailed description of preferred embodiments with reference to the accompanying drawings. Hereinafter, the present invention will be described in detail so that those skilled in the art can easily understand and reproduce the present invention through these embodiments.

1 is an exemplary diagram of a ubiquitous traffic sensor network system according to an embodiment of the present invention.

As shown in FIG. 1, the ubiquitous sensor network system includes a vehicle terminal device 10, a roadside device 20, and a traffic management device 30.

The vehicle terminal device 10 is mounted inside the vehicle to generate traffic information, and transmits the generated traffic information to the adjacent roadside device 20 in a wireless communication manner. Here, the traffic information may include vehicle state information such as the location and speed of the vehicle, accident situation occurrence information such as a traffic accident, and traffic information collected from an adjacent vehicle terminal device.

According to an exemplary embodiment, the vehicle terminal device 10 periodically receives vehicle position information and time information from a differential global positioning system (DGPS) and generates traffic information including vehicle state information accordingly. To the adjacent roadside device 20. According to another exemplary embodiment, the vehicle terminal device 10 may transmit traffic information including accidental occurrence information such as a traffic accident to the adjacent roadside device 20 or the adjacent vehicle terminal device. According to another exemplary embodiment, the vehicle terminal device 10 may transmit traffic information received from the adjacent vehicle terminal device to the adjacent roadside device 20 or another adjacent vehicle terminal device.

As described above, the vehicle terminal device 10 may transmit or receive traffic information to the adjacent roadside device 20 or the adjacent vehicle terminal device in a wireless communication manner. According to an exemplary embodiment, the vehicle terminal device 10 may transmit or receive traffic information to the adjacent roadside device 20 or the adjacent vehicle terminal device through a connectionless wireless communication method based on a media access control (MAC) address. have. Here, the connectionless wireless communication method may be an IEEE 802.11p (WAVE) wireless communication standard, the IEEE 802.11p (WAVE) wireless communication standard has the same physical layer standard as IEEE 802.11a, a wireless LAN standard of 5GHz band. In order to improve the Doppler effect in a high-speed moving environment of a vehicle, the bandwidth of 10 MHz is reduced by half of the WLAN. Therefore, even when the vehicle speed is 100 km / h or more, data communication related to traffic information can be performed with the adjacent roadside device 10 and the adjacent vehicle terminal devices.

The roadside device 20 receives traffic information in a wireless communication manner with at least one vehicle terminal device 10 entering the preset communication range 40, and transmits the received traffic information to the traffic management device 30. do. The roadside device 20 receives the traffic information collected from the vehicle terminal apparatus 10 by performing data communication between the vehicle terminal apparatuses 10 by IEEE 802.11p, which is the same wireless communication method as the vehicle terminal apparatus 10. can do. The roadside device 20 transmits the traffic information received from the vehicle terminal device 10 that has entered the preset communication range 40 to the traffic management device 30 by wired communication, which is an Ethernet communication method. It is desirable to. In addition, the roadside device 20 may perform data communication with at least one of the roadside devices in the vicinity of the IEEE 802.11g (TCP / IP) communication standard.

As described above, the roadside performs data communication with the at least one vehicle terminal device 10 that has entered the communication range 40 preset by the wireless communication method, and performs data communication with the traffic management device 30 by the wired communication method. The device 20 may transmit the traffic information received from the vehicle terminal device 10 to the traffic management device 30 by changing the traffic information received from the vehicle terminal device 10 to a wired communication method. As described above, a technique for changing and transmitting data received through wireless communication to a wired communication method is a well-known technology, and thus detailed description thereof will be omitted.

The traffic management device 30 performing data communication with the plurality of roadside devices 20 in a wired communication manner may determine traffic conditions for each road by analyzing traffic information collected from the plurality of roadside devices 20.

As such, in order for the traffic information of the vehicle terminal device 10 collected by the plurality of roadside devices 20 to be received by the traffic management device 30, the plurality of roadside devices 10 and the traffic management device 30 may be used. Data communication must be maintained smoothly. Accordingly, the roadside device 20 and the traffic management device 30 may facilitate data communication between the roadside device 20 and the traffic management device 30 through the following operations.

The roadside device 20 determines whether the traffic information is received from the vehicle terminal apparatus 10 within a preset threshold time, and receives the traffic information from the vehicle terminal apparatus 10 mounted in the at least one vehicle within the preset threshold time. If not, the connection management related message is transmitted to the traffic management device 30 to maintain a normal network state. As such, the reason for transmitting the connection maintenance-related message to the traffic management device 30 is that the connection state between the roadside device 20 and the traffic management device 30 is abnormal during the time when the roadside device 20 cannot transmit traffic information. Can be made. Therefore, when the traffic information is not received from the at least one vehicle terminal device 10 within a predetermined threshold time, the roadside device 20 transmits a connection maintenance related message to the traffic management device 30.

For this reason, the roadside device 20 that has transmitted the connection maintenance-related message to the traffic management device 30 receives a response message from the traffic management device 30, and the roadside device 20 and the traffic management device. It can be determined that the connection state between the 30 is normal. On the other hand, when the response message is not received, the roadside device 20 determines that the connection state between the traffic management device 30 is abnormal, performs initialization for the operation of the roadside device 20 and the traffic management device 30 The connection can be made normally. That is, the roadside device 20 may check whether the connection state with the traffic management device 30 is normal by itself so that the connection state with the traffic management device 30 can be normally maintained.

Meanwhile, the traffic management device 30 that analyzes the traffic information received from the roadside device 20 and provides road situation information related to the roadside device 20 has a traffic information from the roadside device 20 within a preset threshold time. If it is not received, it may be determined that there is an abnormality in the connection state with the corresponding roadside device 20. That is, if the traffic information is not received from the roadside device 20 within a predetermined threshold time, the traffic management device 30 transmits a connection maintenance message to the corresponding roadside device 20. Thereafter, when the traffic management device 30 receives the response message related to the connection maintenance message from the roadside device 20, the traffic management device 30 determines that the connection state with the roadside device 20 is normal.

On the other hand, if a response message related to the connection maintenance message is not received, the traffic management device 30 transmits an initialization command message to the corresponding roadside device 20 so that the operation of the roadside device 20 is initialized. After transmitting the initialization command message, when a connection request message is received from the roadside device 20, the traffic management device 30 performs reconnection with the roadside device 20. Accordingly, data communication related to traffic information between the traffic management device 30 and the roadside device 20 may be normally performed.

On the other hand, if the connection request message is not received from the roadside device 20 after transmitting the initialization command message, the traffic management device 30 determines that an abnormality has occurred in the operation of the roadside device 20, and the manager terminal device ( 50) a recovery request message for the roadside device 20 is transmitted. Accordingly, the manager may recognize that an abnormality has occurred in the corresponding roadside device 20 by referring to the recovery request message received by the manager terminal device 50, and quickly perform the recovery.

Up to now, the operation for smooth data communication between devices in the ubiquitous traffic sensor network system according to the present invention has been briefly described. Hereinafter, each component of the ubiquitous traffic sensor network system according to the present invention will be described in detail.

2 is a block diagram showing the configuration of a traffic management apparatus according to an embodiment of the present invention.

As shown in FIG. 2, the traffic management apparatus includes a communication unit 210, a controller 220, a traffic information DB 230, and a display unit 240.

The communicator 210 performs wired data communication with a roadside device that collects traffic information of a vehicle that has entered a predetermined range. If the traffic information is not received from the roadside device within a predetermined threshold time through the communication unit 210, the controller 220 transmits a connection maintenance message to the corresponding roadside device so that a normal network state with the roadside device is maintained. The traffic information DB 230 stores identification information of the plurality of roadside devices and traffic information received from at least one roadside device among the plurality of roadside devices.

In detail, at least one roadside device among the plurality of roadside devices may receive traffic information through wireless communication from a vehicle terminal device mounted on the vehicle as at least one vehicle enters a preset communication range. To send. Here, the traffic information may include vehicle state information such as the location and speed of the vehicle, accident situation occurrence information such as a traffic accident, and traffic information collected from an adjacent vehicle terminal device. As such, when traffic information is received from the at least one roadside device through the communication unit 210, the controller 220 stores the received traffic information in the traffic information DB 230. In addition, the controller 220 analyzes the received traffic information and provides a road situation (eg, a traffic accident, illegal parking, road congestion) of a roadside device through which the traffic information is transmitted through the display unit 240. . Therefore, the person in charge of the road traffic can grasp the traffic situation information for each road through the display unit 240 in real time.

As such, the controller 220 analyzing the traffic information received from the plurality of roadside devices and providing traffic situation information for each road through the display unit 240 is a roadside device search unit 221 and a connection maintaining unit 222. And a normal connection state with each of the roadside devices through the initialization command unit 223. The roadside device search unit 221 analyzes traffic information for each roadside device stored in the traffic information DB 230 and searches for a roadside device that has not transmitted traffic information within a predetermined threshold time. The connection maintenance unit 222 transmits a connection maintenance message to the corresponding roadside device by using the identification information of the roadside device retrieved from the roadside device searcher 221. In addition, the initialization command unit 223 checks whether a response message related to the connection maintenance message is received within the preset threshold time from the roadside apparatus which transmitted the connection maintenance message, and if the response message is not received within the preset threshold time, Send a command message.

In detail, the roadside device retrieval unit 221 searches for the roadside device that has not transmitted the traffic information within a predetermined threshold time by using the time information in which the traffic information for each roadside device is stored from the traffic information DB 230. When a roadside device that does not transmit traffic information within a preset threshold time is found through the roadside device searching unit 221, the connection maintaining unit 222 sends a connection maintenance message to the corresponding roadside device using the retrieved roadside device identification information. send. That is, the connection maintaining unit 222 maintains the connection maintenance message to the corresponding roadside device to determine whether the connection state of the corresponding roadside device is abnormally made or whether the connection state is normal but the traffic information collection has not been performed for a predetermined threshold time. Send it.

As such, when the connection maintenance message is transmitted to the roadside device that has not transmitted traffic information within the preset threshold time through the connection maintenance unit 222, the initialization command unit 223 responds to the connection maintenance message transmission from the corresponding roadside device. Check if the message is received within a preset threshold time. As a result of the check, if it is checked that the response message is received within the preset threshold time, the initialization command unit 223 determines that the connection state of the corresponding roadside device is normal, and does not perform a connection maintenance operation with the roadside device. On the other hand, if it is determined that the response message is not received within the preset threshold time, the initialization command unit 223 determines that the connection state of the corresponding roadside device is abnormal, and transmits the initialization command message to the roadside device which transmitted the connection maintenance message. send.

Meanwhile, the connection maintaining unit 222 checks whether a connection request message is received within a preset threshold time from the roadside device which transmitted the initialization command message. As a result of the check, if the access request message is received within a predetermined threshold time, the connection maintaining unit 222 may reset the connection with the roadside device by transmitting a response message to the access request message to the corresponding roadside device. On the other hand, if the check result, if the access request message is not received within a predetermined threshold time, the connection maintaining unit 222 determines that the corresponding roadside device is not initialized, and transmits a recovery request message for the roadside device to the manager terminal device. do. Accordingly, the administrator may quickly recognize that an abnormality has occurred in the corresponding roadside apparatus with reference to the restoration request message received by the administrator terminal device.

Up to now, each configuration of the traffic management apparatus according to the present invention has been described in detail. Hereinafter, each configuration of the roadside device that performs data communication with the aforementioned traffic management device will be described in detail.

3 is a block diagram of a roadside apparatus according to an embodiment of the present invention.

As shown in FIG. 3, the roadside apparatus includes a data communication unit 310 and a control unit 320. The data communication unit 310 performs Kyoto information related data communication with a surrounding roadside device, a vehicle terminal device and a traffic management device of a vehicle entering a predetermined communication range, and includes first and second communication units 211 and 212. do.

The first communication unit 311 transmits and receives traffic information related data through a wireless data communication with a vehicle terminal device mounted on at least one vehicle entered into a preset communication range. In addition, the second communication unit 312 transmits the traffic information received through the first communication unit 311 to the traffic management device through a data communication in a wired manner with the traffic management device. On the other hand, the control unit 220 according to whether the traffic information is received from the vehicle terminal device of the at least one vehicle entered into the preset communication range within a predetermined threshold time, the normal network and the traffic management device through the second communication unit 312 Send and receive connection maintenance related messages for state maintenance.

The control unit 220 may transmit and receive a connection maintenance related message for maintaining a normal network state with the traffic management device through the connection execution unit 321. When the connection performing unit 321 receives the connection maintenance message from the traffic management device, the connection performing unit 321 transmits a response message accordingly. Meanwhile, when the recovery request message is received from the traffic control device, the connection execution unit 321 initializes the roadside device operation. In this way, by performing the initialization of the operation of the roadside device, the connection state between the traffic management devices are not made. Therefore, the connection execution unit 321 transmits a connection request message so that the connection state with the traffic management apparatus is reset.

In detail, the traffic management apparatus checks whether traffic information is received from the corresponding roadside apparatus within a predetermined threshold time. As a result of the check, if the traffic information is not received within the preset threshold time, the traffic management apparatus transmits the connection maintenance message to the roadside device that has not transmitted the traffic information within the preset threshold time. When such a connection maintenance message is received through the second communication unit 312, the connection performing unit 321 transmits a response message related to the connection uni-message to the traffic management apparatus which transmitted the connection maintenance message. Accordingly, the traffic management apparatus determines that the connection state with the roadside apparatus which transmitted the connection maintenance message is normal.

On the other hand, if the traffic management device that transmits the connection maintenance message does not receive a response message related to the connection maintenance message from the roadside device within a preset threshold time, the traffic management device transmits a recovery request message to the corresponding roadside device. When the recovery request message is received from the traffic management apparatus, the connection execution unit 321 performs initialization of the operation of the roadside apparatus. Thereafter, the connection performing unit 321 transmits a connection request message to the traffic management apparatus so as to reconnect with the traffic management apparatus. Therefore, the connection state between the roadside apparatus and the traffic management apparatus can be normally performed.

On the other hand, according to an additional aspect of the present invention, the control unit through the self-diagnostic unit 322 may make the connection state with the traffic management device normally. In detail, the self-diagnosis unit 322 checks whether the traffic information is received within a predetermined threshold time through the first communication unit 311. If the traffic information is not received within a preset threshold time through the first communication unit 311, the self-diagnostic unit 322 transmits a connection maintenance message to the traffic management device through the second communication unit 312, and thereby a response message. Checks whether is received. As a result of the check, when the response message is received, the self-diagnosis unit 322 determines that the connection state with the traffic management apparatus is normal. On the other hand, if a check message is not received from the traffic management device, the self-diagnostic unit 322 determines that the connection state with the traffic management device is abnormal, and performs the initialization of the roadside device operation. When the initialization of the operation of the roadside device is completed, the connection performing unit 321 transmits a connection request message to the traffic management device so as to reconnect with the traffic management device. Therefore, the connection state between the roadside apparatus and the traffic management apparatus can be normally performed.

So far, the respective components of the roadside apparatus according to the present invention have been described in detail. Hereinafter, a method for maintaining a smooth data communication state between the aforementioned traffic management apparatus and the roadside apparatus will be described in detail.

4 is a flowchart of a method for maintaining a data communication state with a roadside apparatus in a traffic management apparatus according to an embodiment of the present invention.

As illustrated in FIG. 4, the traffic management apparatus includes at least one roadside apparatus among a plurality of roadside apparatuses within a predetermined threshold time in order to maintain a smooth data communication state with a plurality of roadside apparatuses collecting traffic information of a vehicle. Check whether the traffic information is received from (S410). Here, the traffic management apparatus may receive traffic information of the vehicle terminal apparatus of a vehicle that enters a predetermined communication range from at least one roadside apparatus among a plurality of roadside apparatuses through a wired data communication. As such, the traffic management apparatus that receives the traffic information from at least one of the plurality of roadside devices through a wired communication method, if the traffic information is not received from the at least one roadside device within a predetermined threshold time, the previously stored corresponding information. The connection maintenance message is transmitted using the identification information of the roadside apparatus (S420).

In detail, the traffic management apparatus may check whether there is a roadside apparatus that does not transmit traffic information within a predetermined threshold time by using time information in which traffic information for each of the plurality of roadside apparatuses is stored from the traffic information DB. As a result of the check, if a roadside device that does not transmit traffic information within a predetermined threshold time is checked, the traffic management device transmits a connection maintenance message to the corresponding roadside device using the identification information of the corresponding roadside device. Thereafter, the traffic management apparatus checks whether a response message related to the connection maintenance message is received from the roadside device which transmitted the connection maintenance message (S430).

As a result of the check, if it is checked that the response message has been received, the traffic management apparatus determines that the connection state with the roadside apparatus which transmitted the connection maintenance message is normally established. On the other hand, if it is determined that the response message is not received within the preset threshold time from the roadside apparatus which transmitted the connection maintenance message, the traffic management apparatus determines that the connection state with the roadside apparatus which transmitted the connection maintenance message is abnormal. As such, when the response message related to the connection maintenance message is not received within the preset threshold time, the traffic management apparatus requests the initialization of the operation of the roadside device which transmitted the connection maintenance message to maintain the connection with the corresponding roadside apparatus ( S440).

As such, when a response message is not received from the roadside device that transmits the connection maintenance message, the traffic management device may continuously maintain a normal connection state with the corresponding roadside device through the method shown in FIG. 5.

5 is a flowchart of a method for maintaining a normal connection state with a roadside device in an abnormally connected state in a traffic management apparatus according to an embodiment of the present invention.

As illustrated in FIG. 5, the traffic management apparatus checks whether a response message related to the connection maintenance message is received within a preset threshold time from a roadside device that transmits the connection maintenance message. As a result of the check, if the response message is not received within the preset threshold time, the traffic management apparatus transmits an initialization command message to the roadside apparatus which transmitted the connection maintenance message (S510). Thereafter, the traffic management apparatus checks whether a response message related to the initialization command message is received from the roadside device which transmitted the initialization command message (S520). Here, the response message related to the initialization command message is preferably a connection request message for reconnection with the traffic management device according to the initialization of the operation of the roadside device. Therefore, the traffic management apparatus checks whether an access request message for reconnection with the traffic management apparatus is received from the corresponding roadside apparatus, and when the access request message is received, resets the connection with the corresponding roadside apparatus (S530).

On the other hand, if the check result, if the access request message is not received within a predetermined threshold time, the traffic management device determines that the roadside device is not initialized, and transmits a recovery request message for the roadside device to the manager terminal device (S540). ). Accordingly, the administrator may recognize that an abnormality has occurred in the corresponding roadside apparatus with reference to the restoration request message received by the administrator terminal device, and may quickly perform the restoration.

Up to now, the method for maintaining a smooth data communication state with the roadside device for collecting traffic information in the traffic management device according to the present invention has been described in detail. Hereinafter, a method for maintaining a smooth data communication state with a traffic management apparatus in a roadside apparatus according to the present invention will be described in detail.

6 is a flowchart of a method for maintaining a smooth data communication state with a traffic management apparatus in a roadside apparatus according to an embodiment of the present invention.

As illustrated in FIG. 6, the roadside apparatus checks whether traffic information is received from the vehicle terminal apparatus of at least one vehicle within a predetermined threshold time (S610). Here, the roadside device and the vehicle terminal device of the vehicle preferably transmit and receive data related to traffic information in a wireless communication method. As a result of the check, if the traffic information is received from the vehicle terminal device of the at least one vehicle within a preset threshold time, the roadside device transmits the received traffic information to the traffic terminal device (S620). Here, the roadside device and the traffic management device preferably transmit and receive data related to traffic information in a wired communication manner.

On the other hand, if the traffic information is not received from the vehicle terminal device of the at least one vehicle within the preset threshold time, the roadside device checks whether the self-diagnosis is set (S630). Thereafter, the roadside device transmits or receives a connection maintenance related message to the traffic management device according to whether the self-diagnosis is set to maintain a normal network state.

If the self-diagnosis is not set, the roadside device receives the connection maintenance message from the traffic management device, and transmits a response message related to the received connection maintenance message (S640, S650). In detail, when traffic information is not received from the roadside device within a predetermined threshold time, the traffic management device transmits a connection maintenance message to the corresponding roadside device to check whether the connection state with the roadside device is normal. The roadside device that receives the connection maintenance message transmits a response message related to the received connection maintenance message. Accordingly, the traffic management device determines that the connection state with the corresponding roadside device is normal through the received response message.

Meanwhile, the roadside apparatus which transmits the response message to the traffic management apparatus checks whether a recovery request message is received from the traffic management apparatus (S660). In detail, the traffic management apparatus checks whether a response message related to the connection maintenance message is received within a preset threshold time. As a result of the check, if the response message related to the connection maintenance message is not received within the preset threshold time, the traffic management apparatus determines that the connection state with the corresponding roadside device is abnormal, and transmits a recovery request message to the corresponding roadside device. As such, when the recovery request message is received from the traffic management apparatus, the roadside apparatus performs initialization of the operation of the roadside apparatus. When the initialization is completed, the roadside device transmits an access request message to the traffic management device for reconnection with the traffic management device (S670). Therefore, the traffic management apparatus may reconnect with the roadside apparatus so that the connection state between the roadside apparatus and the traffic management apparatus may be normally performed.

On the other hand, if it is checked in step S630 that the self diagnosis is set, the roadside apparatus transmits a connection maintenance message to the traffic management apparatus (S680). That is, the roadside device set as the self-diagnosis transmits the connection maintenance message to the traffic management device if the traffic information is not received from the vehicle terminal device within a preset threshold time. Thereafter, the roadside apparatus checks whether a response message related to the connection maintenance message is received from the traffic management apparatus which has transmitted the connection maintenance message, and determines whether the connection state with the traffic management apparatus is normal. Specifically, when the response device receives the response message from the traffic management device that transmitted the connection maintenance message, it determines that the connection state with the traffic management device is normal.

Meanwhile, as a result of the check, if the response message related to the connection maintenance message is not received from the traffic management device within a preset threshold time, the roadside device performs initialization of the operation of the roadside device. When the initialization is completed, the roadside device transmits a connection request message to the traffic management device for reconnection with the traffic management device (S690). Therefore, the traffic management apparatus may reconnect with the roadside apparatus so that the connection state between the roadside apparatus and the traffic management apparatus may be normally performed.

So far I looked at the center of the preferred embodiment for the present invention.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is clearly understood that the same is by way of illustration and example only and is not to be construed as limiting the scope of the invention as defined by the appended claims. It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention.

10: vehicle terminal device 20: roadside device
30: traffic management device 40: communication range
50: manager terminal device 210: communication unit
220: control unit 221: roadside device search unit
222: connection holding unit 223: initialization command unit
230: traffic information DB 240: display unit
310: data communication unit 311: first communication unit
312: second communication unit 320: control unit
321: connection execution unit 322: self-diagnosis unit

Claims (16)

A communication unit configured to perform data communication with a roadside device that collects traffic information of a vehicle that has entered a preset range; And
And a controller configured to transmit a connection maintenance message to the roadside device such that normal traffic state is maintained with the roadside device when the traffic information is not received from the roadside device within a preset threshold time through the communication unit.
The control unit,
An initialization command unit for transmitting an initialization command message to the roadside device if a response message according to the transmission of the connection maintenance message is not received within the preset threshold time from the roadside device; And
A connection maintaining unit which transmits a recovery request message for the roadside device to a manager terminal device when the access request message is not received within a preset threshold time from the roadside device which transmitted the initialization command message;
Traffic management device comprising a. The method of claim 1,
And a traffic information DB for storing identification information of a plurality of roadside devices and traffic information received from at least one roadside device among the plurality of roadside devices.
The control unit,
A roadside device search unit for analyzing roadside devices for each roadside device stored in the traffic information DB and searching for a roadside device that has not transmitted traffic information within the threshold time;
The connection holding unit,
And transmitting the connection maintenance message to the roadside apparatus using the retrieved roadside apparatus identification information. delete delete In the method for maintaining a smooth data communication state with the roadside device for collecting traffic information of the vehicle in the traffic management device,
Checking whether traffic information is received from the roadside apparatus within a preset threshold time;
If the traffic information is not received from the roadside device within the threshold time, transmitting the connection maintenance message to the roadside device using previously stored identification information of the roadside device; And
And maintaining the connection with the roadside device by performing initialization for the operation of the roadside device according to whether a response message according to the transmission of the connection maintenance message is received from the roadside device.
Maintaining a connection with the roadside device,
Checking whether a response message according to the connection maintenance message transmission from the roadside device is received within the threshold time;
Transmitting an initialization command message to the roadside apparatus if the check result is not received within a preset threshold time; And
If a connection request message is not received within a preset threshold time from the roadside device which transmitted the initialization command message, transmitting a recovery request message for the roadside device to a manager terminal device;
Communication status maintenance method comprising a. The method of claim 5, wherein
The checking step,
And analyzing the traffic information of the roadside device stored in the traffic information DB and checking whether traffic information is received from the roadside device within the threshold time. delete delete A first communication unit which transmits and receives traffic information related data in a wireless manner with a vehicle terminal device of at least one vehicle entered within a preset communication range;
A second communication unit configured to transmit the traffic information received through the first communication unit through a wired data communication with a traffic management device; And
And a controller configured to transmit / receive a connection maintenance related message for maintaining a normal network state with the traffic management device through the second communication unit according to whether the traffic information is transmitted to the traffic management device within a preset threshold time.
The control unit,
If the traffic information is not received through the first communication unit within the threshold time, the connection maintenance message is transmitted to the traffic management device through the second communication unit, and if a response message is not received, the roadside device is operated. A self-diagnostic unit performing initialization for the;
Roadside device comprising a. The method of claim 9,
The control unit,
A connection performing unit which transmits a response message when a connection maintenance message is received from the traffic management apparatus;
Roadside device comprising a. 11. The method of claim 10,
The connection execution unit,
The roadside apparatus when the recovery request message is received from the traffic management device, performs the initialization for the roadside device operation, and transmits a connection request message to the traffic management device. delete A method for maintaining a smooth data communication state with the traffic management device in a roadside device for collecting traffic information of a vehicle and transmitting the traffic information to the traffic management device,
Checking whether traffic information is received from a vehicle terminal apparatus of at least one vehicle within a preset threshold time; And
If the traffic information is not received within the threshold time as a result of the check, maintaining or maintaining a normal network state by transmitting or receiving a connection maintenance related message with the traffic management device according to whether to set a self-diagnosis;
Communication status maintenance method comprising a. The method of claim 13,
Maintaining the network state,
If the self-diagnosis is not set, transmitting a response message related to the connection maintenance message received from the traffic management apparatus;
Communication status maintenance method comprising a. 15. The method of claim 14,
Maintaining the network state,
Initiating an operation of the roadside apparatus when a recovery request message is received from the traffic management apparatus that has transmitted the response message;
Transmitting the access request message to the traffic management device when the initialization is completed;
The communication state maintenance method further comprising. The method of claim 13,
Maintaining the network state,
If the self-diagnosis is set, transmitting a connection maintenance message to the traffic management apparatus;
Checking whether a response message is received from the traffic management apparatus which has transmitted the connection maintenance message; And
If it is determined that the response message is not received, initializing the roadside device operation, and then transmitting a connection request message to the traffic management device accordingly;
Communication status maintenance method comprising a.

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