KR20090110677A - System and method for collecting and providing traffic information in ubiquitous transportation sensor network - Google Patents

Abstract

PURPOSE: A system and a method for collecting and providing traffic information in a ubiquitous transportation sensor network are provided to collect and supply accurate traffic information even traffic is congested. CONSTITUTION: A system and a method for collecting and providing traffic information in a ubiquitous transportation sensor network are comprised of the steps: generating traffic information message by collecting traffic information through a vehicle mounted terminal in driving; and relaying data between vehicle mounted terminal and a gateway(200) which is connectable to IP communication network. The data communication between the vehicle mounted terminal and a router is a wave communication method.

Description

u-SYSTEM AND METHOD FOR COLLECTING AND PROVIDING TRAFFIC INFORMATION IN UBIQUITOUS TRANSPORTATION SENSOR NETWORK}

The present invention relates to a system and method for collecting and providing traffic information in an ubiquitous transportation sensor network (u-TSN) network. More particularly, the present invention relates to a traffic based on a wireless access in vehicular environment (WAVE) based communication scheme. By collecting and providing information, the present invention relates to a system and method that can dramatically improve the efficiency of service provision.

Considering the enormous economic loss to the individual economy as well as to the national economy and our society due to the recent rapid increase in the number of vehicles, the importance of more accurate and necessary traffic information is becoming more important by collecting and providing traffic information. It is increasing.

Conventionally, in order to collect and provide such traffic information, a method using Dedicated Short Range Communication (DSRC), a beacon communication method, and an infrared ray are used as simple information transmission means between a roadside base station device and a vehicle mounting device. A method of using or a method of using a mobile communication (CDMA / TRS) local area network (LAN) may be used.

However, among these, the short-range dedicated communication (DSRC) method has a limitation in collecting future video traffic information due to low transmission speed and narrow service area, and also supports seamless communication when moving vehicles move during service. Mobility and handover capabilities are not supported.

On the other hand, CDMA and TRS, which are broadband wireless communication, have advantages such as wide coverage, high-speed mobility, and handover compared to short-range dedicated communication. In case of vulnerable problems and emergency breakouts, there is a problem in carrying out emergency communication, and economic burden on users' fee for transportation service is emerging as a big problem.

Recently, WLAN (IEEE802.11b / g) technology has been used as a way to solve this problem. However, the existing WLAN technology has consumed a lot of time to secure connectivity between the communication carriers. In the environment, there is no limit to the simultaneous transmission and reception of information from a plurality of vehicles in a short time, and mobility and handover support for seamless service in case of leaving the service area are not provided.

Therefore, it supports fast transmission speed and wide coverage area, and it is possible to collect and provide accurate traffic information even when the traffic is congested or dense, guaranteeing high security of personal information, and providing high-speed mobility, There is an urgent need to develop traffic information collection and provision technology that can flexibly cope with future service expansion.

The present invention is to solve the problems of the prior art as described above, the collection and provision of traffic information using a wireless access in Vehicular Environment (WAVE) -based communication method in a Ubiquitous Transportation Sensor Network (u-TSN) network By supporting fast transmission speed and wide coverage area, it is possible to collect and provide accurate traffic information even in heavy traffic or high traffic density, guarantee high security of personal information, and flexibly to expand service in the future. It is an object of the present invention to provide a system and method that can cope with the problem.

According to an embodiment of the present invention for achieving the above object, as a network system for collecting traffic information in the Ubiquitous Transportation Sensor Network (u-TSN) network and processing and providing the collected traffic information, stop or One or more vehicle terminals 500 for collecting traffic information and generating a traffic information message during the movement, and data communication with the vehicle terminal 500, and a gateway 200 and the vehicle terminal capable of accessing an IP network communication network ( The system includes a router 300 for relaying data communication between 500, and the data communication between the vehicle terminal 500 and the router 300 is performed by a wireless access in vehicular environment (WAVE) communication method. Is provided.

The WAVE-based communication method may be performed by a channel form in which a control channel and a data channel, which can always communicate, are separated.

Communication between the vehicle terminal 500 and communication between the vehicle terminal 500 and the router 300 are performed using an address defined by a host identifier (HID) of the vehicle terminal 500. Can be.

The gateway 200 converts an address defined by a host identifier (HID) of the vehicle terminal 500 and a network address translation (NAT) and network for interworking between the IP network communication network and the u-TSN network. You can perform address port translation (NAPT).

The address defined by the host identifier (HID) may be an IPv6 address system, a dynamic IP using a Dynamic Host Configuration Protocol (DHCP) of an IPv4 address system, or a vehicle in which the vehicle terminal 500 is mounted. System comprising a unique number.

The system may further include a roadside terminal 400 capable of data communication with the vehicle terminal 500 or the gateway 200 by relaying the router 300.

According to another embodiment of the present invention for achieving the above object, at least one vehicle terminal 500, the router 300 capable of data communication with the vehicle terminal 500, the data communication with the router 300 is possible And collecting traffic information in a ubiquitous transportation sensor network (u-TSN) network including a gateway (200) accessible to a network communication network and providing the collected traffic information, wherein the gateway (200) is an IP network communication network. Exchanging data transmitted and received with the router 300; And exchanging, by the router 300, the vehicle terminal 500 and the data, wherein the data communication between the router 300 and the vehicle terminal 500 is performed by a WAVE based communication method. Features are provided.

According to the present invention, it is possible to provide a traffic information collection and transmission service supporting a high data transmission speed and a wide area service coverage by using a WAVE based communication method.

In addition, according to the present invention, it is possible to build a self network by collecting and transmitting traffic information through the u-TSN network, and thus it is possible to flexibly cope with network expansion or service expansion.

Meanwhile, according to the present invention, since the host identifier (HID) is used to collect and transmit traffic information through the u-TSN network, concerns about personal information exposure can be solved.

According to the present invention, even when a moving vehicle leaves the service area, seamless communication and service can be provided through handover.

In addition, according to the present invention it is possible to communicate between the vehicle and the vehicle in high-speed movement using the WAVE-based communication method and the host identifier (HID).

In addition, according to the present invention it is possible to minimize the accident between the vehicle by transmitting the accident situation in a prompt time through the emergency message communication to the other vehicle in an accident or emergency situation between the vehicle through the communication between the vehicle and the high-speed moving.

In addition, according to the present invention, traffic information is collected and provided using a WAVE-based communication scheme, and a control channel and a data transmission channel are separately operated for access between mutual communication nodes. Also, traffic information can be accurately collected and provided, and the number of terminals that can be connected to the traffic information transmission repeater per second can be dramatically increased.

DETAILED DESCRIPTION The following detailed description of the invention refers to the accompanying drawings that show, by way of illustration, specific embodiments in which the invention may be practiced. These embodiments are described in sufficient detail to enable those skilled in the art to practice the invention. It should be understood that the various embodiments of the present invention are different but need not be mutually exclusive. For example, certain shapes, structures, and characteristics described herein may be embodied in other embodiments without departing from the spirit and scope of the invention with respect to one embodiment. In addition, it is to be understood that the location or arrangement of individual components within each disclosed embodiment may be changed without departing from the spirit and scope of the invention. The following detailed description is, therefore, not to be taken in a limiting sense, and the scope of the present invention is defined only by the appended claims, along with the full range of equivalents to which such claims are entitled. Like reference numerals in the drawings refer to the same or similar functions throughout the several aspects.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art can easily implement the present invention.

Configuration of the entire system

1 is a schematic configuration diagram of an entire system for collecting and providing traffic information according to an embodiment of the present invention.

As shown in FIG. 1, the entire system according to an embodiment of the present invention includes a network communication network, a central control server 100, a gateway 200, a roadside terminal 400, a router 300, and a vehicle terminal 500. It can be composed of).

First, the u-TSN network may be configured regardless of communication modes such as wired and wireless, and may include a local area network (LAN), a metropolitan area network (MAN), and a wide area network (WAN). It can be configured in various communication network forms such as network, and the u-TSN network has a network structure of a type suitable for a road network that collects traffic information in a similar network form based on this wireless IP. Preferably, the network communication network according to the present invention may be a known wireless communication based IP communication network.

The central control server 100 performs data communication with the gateway 200 through a network communication network. The central control server 100 may be, for example, a server operated by a company providing a traffic information collection and provision service of the present invention. The central control server 100 processes and stores the traffic information collected from the overall u-TSN (Ubiquitous Transportation Sensor Network) network, and processes the processed traffic at the request of the roadside terminal 400 or the vehicle terminal 500. Provide information.

The gateway 200 performs a network interworking function between the u-TSN network and the network communication network, which is dedicated to collecting WAVE-based traffic information. In addition, the mobile terminal 400 and the vehicle terminal 500 in the u-TSN network performs a function, that is, performs communication with the router 300 to support the collection and provision of traffic information. Meanwhile, the gateway 200 manages addresses in the u-TSN network and supports handover and network security functions of the vehicle terminal 500.

In addition, the gateway 200 must support Network Address Translation (NAT) or Network Address Port Translation (NAPT) to access a network communication network used for communication with the central control server 100. do. In other words, by converting the private IP address used in the u-TSN network with the public IP address, a number of public IP addresses must be used together. By supporting network address translation (NAT) or network address port translation (NAPT), a firewall is installed between the public network network and the u-TSN network to protect the network in the u-TSN network from external attacks. have. Specifically, the gateway 200 supports network address translation (NAT) or network address port translation (NAPT), so that only the public IP address assigned to the gateway, which is a device that connects to an external communication network, that is, a network communication network, is notified to the outside. Since the attacker does not know the private IP address that the external intruder wants to attack, the attack is impossible, thereby protecting the internal network in the u-TSN network.

The router 300 communicates with the vehicle terminal 500 that collects and provides traffic information through a WAVE based communication method, thereby supporting a terminal access function of the vehicle terminal 500. Meanwhile, the router 300 performs data communication with the roadside terminal 400 through Ethernet communication, and performs a routing function for transferring information collected from the vehicle terminal 500.

The roadside terminal 400 connects to the router 300 through Ethernet communication to perform a function of collecting traffic information. The roadside terminal 400 may be an infrastructure or the like provided on the roadside of the road. The roadside terminal 400 may communicate with the vehicle terminal 500 through the router 300, and collect the collected traffic information to the vehicle terminal 500. Can provide.

The vehicle terminal 500 accesses the router 300 using a WAVE-based communication scheme to perform a function of collecting and providing traffic information. The vehicle terminal 500 may connect to another vehicle terminal 500 through the router 300 to perform data communication. On the other hand, the vehicle terminal 500 may include a traffic information application processing module (not shown) therein to process the collected traffic information. The vehicle terminal 500 may be implemented by a ubiquitous vehicle sensor (UVS).

bracket Between components  Communication method

Hereinafter, a description will be given of a communication method between each component, which is a main feature of the present invention.

In the entire system according to an embodiment of the present invention described with reference to FIG. 1, a u-TSN network supporting a function of collecting and providing traffic information may be largely divided into several parts. Let's explain.

1. Communication method between the gateway 200 and the router 300

First, the network between the gateway 200 and the router 300 is composed of a conventional wireless mesh network (WMN). Wireless mesh network is a short-range wireless communication technology that can communicate with each other in a wireless infrastructure environment regardless of fixed or mobile. The wireless mesh network is a non-IP network having only a wireless link, and is connected to multiple local area networks (LANs) so that data may be sent to another path even when one of the communication networks is broken. The network can be used without interruption even during high-speed movement. The router 300 includes a directional antenna to configure a mesh network, and may use OLSR (Optimized Link State Routing), a protocol for obtaining path information with neighbor nodes using a link state routing protocol for routing.

The network interface between the network communication network with the gateway 200 may be an optical Ethernet, Ethernet, or DSL interface, and the network between the gateway 200 and the router 300 or the network interface between the router 300 and another router 300 may be wireless. It may be an RF interface.

2. Communication method between the router 300 and the vehicle terminal 500

Next, a network method between the router 300 and the vehicle terminal 500 which is a main feature of the present invention will be described. Communication between the router 300 and the vehicle terminal 500 is performed by a WAVE-based network. WAVE-based communication method is a technology that enables communication between vehicles in 5GHz band using 802.11 wireless technology.It is a communication method dedicated to collecting traffic information, and maintains an IP network in consideration of communication characteristics between high-speed mobiles having a short connection duration. It is a communication method that does not use the overhead required for this purpose, and for this purpose, in the present invention, a WAVE-based communication is performed, but a method of interconnecting at an application layer without an IP layer is used.

The first communication connection between the router 300 and the vehicle terminal 500 in the u-TSN network is made by the WAVE mode.

3. Communication method between vehicle terminals

Communication between the vehicle terminals 500 is performed by an ad hoc network, which also uses a WAVE-based communication scheme suitable for data transmission of a high speed mobile vehicle. As described above, since the WAVE-based communication method uses a short message transmission method, the WAVE-based communication method is well suited for communication between mobile devices moving at high speed, such as collecting and providing traffic information.

The vehicle terminal 500 must support an ad hoc routing function to support multi-hop communication with other vehicle terminals 500 and must be able to perform a mutual relay function.

On the other hand, addressing for communication between the vehicle terminal 500 is a host identifier (HID) using the unique identifier of the vehicle terminal 500.

4. The communication method between the router 300 and the roadside terminal 400

Communication between the router 300 and the roadside terminal 400 is made by an Ethernet communication method. To this end, the router 300 and the roadside terminal 400 may have a 10 / 100BaseT, USB, and other Ethernet interfaces as physical Ethernet interfaces.

Meanwhile, the addressing between the router 300 and the roadside terminal 400 also uses a host identifier (HID).

Hereinafter, a process of transmitting and receiving a packet in a u-TSN network will be described.

Packet transmission process

Hereinafter, referring to FIG. 2, a process in which the vehicle terminal 500 transmits a data packet related to a traffic information message to the central control server 100 through the u-TSN network according to an embodiment of the present invention will be described in detail. Let's do it. Prior to the description, it is assumed that the vehicle terminal 500 and the router 300 are connected to each other by the above-described WAVE-based network.

The vehicle terminal 500 or another vehicle terminal 500 connected to the vehicle terminal 500 has a conventional sensor used for collecting traffic information, and collects traffic information while stopping or moving by using the sensor. The message is generated by the information (S210).

As such, all data generated by the vehicle terminal 500 or another vehicle terminal 500 connected with the vehicle terminal 500 are transmitted to the router 300 (S220). The vehicle terminal 500 may include an application program such as a vehicle terminal manager (UVS Manager) for controlling message transmission to the router 300.

Meanwhile, when transmitting a message, the vehicle terminal 500 attaches a host identifier (HID) generated at the time of WAVE-based connection to the upper part of the WAVE terminal and transmits the message (S225). The host identifier (HID) is required for host identification for continuous service even when the vehicle terminal 500 moves. When the vehicle terminal 500 transmits data to the router 300, the vehicle terminal 500 does not have an IP and is connected to only a data link called WAVE. The router 300 receives a message transmitted from the vehicle terminal 500 through the WAVE interface.

The router 300 may include an application program such as a router manager for controlling messages transmitted and received, and all data received through the WAVE interface may be transmitted to the application program.

The router 300 receiving the message from the vehicle terminal 500 creates an IP datagram using this (S230). Meanwhile, the same type of WAVE message transmitted from the plurality of vehicle terminals 500 may be filtered through the filtering function of the router 300, whereby duplicate data may be deleted. Meanwhile, the IP datagram generated by the router 300 may be transmitted to the gateway 200 (S241) or the roadside terminal 400 (S243). The IP datagram may be transmitted by a request from any roadside terminal 400, and the IP datagram transmission from the router 300 to the roadside terminal 400, that is, the roadside by local processing traffic information transmission. The terminal 400 may collect and process the received IP datagram. On the other hand, as will be described later, by the IP datagram transmission from the router 300 to the gateway 200, that is, the center processing traffic information transmission, the data is processed by the central control server 100 later.

As described above, the gateway 200 serves as a gateway of the u-TSN network and plays a boundary between a commercial IP and a host identity protocol (HIP). When the IP datagram transmitted from the router 300 reaches the gateway 200, the gateway 200 performs network address translation (NAT) and network address port translation (NAPT) (S250).

Specifically, the data arriving at the gateway 200 needs an IP address to be transferred to a data communication network such as the Internet. To this end, network address translation (NAT) is performed to convert the host identifier (HID) used in the u-TSN network into an IP address. In the address allocation method, the source IP address assigned by the manager function of the router 300 is assigned an address of the router 300 assigned to the source port, and the destination address is assigned an address assigned to the destination port. will be.

After this process, the gateway 200 transmits the data to the central control server 100 (S260), whereby the central control server 100 receiving the data is processed and stored the received data (S270). ).

Packet Receipt Process

Hereinafter, a process of receiving a data packet transmitted from the central control server 100 will be described with reference to FIG. 3.

When the packet is transmitted from the u-TSN network to the central control server 100 by the packet transmission method as described above, the central control server 100 performs data processing such as processing the transmitted data (S310), In response to this, the source IP is converted into the destination IP for the received packet, and the source port is converted into the destination port and transmitted again to the wireless u-TSN network (S320).

By the transmission, the gateway 200 receives a packet through a network communication network, and performs network address translation (NAP) and network address port translation (NAPT) on this (S330). At this time, the table created during the transmission of the packet, that is, the table summarized about the network address port translation operation can be referred to. This network address port translation may be performed in a network address port translation (NAPT) stack that is implemented separately from the gateway manager. Network Address Translation (NAT) and Network Address Port Translation (NAPT) can be performed by using the destination IP and destination port of the received packet to find the input IP and the input port, and swapping the destination IP and destination port. That is, network address translation (NAT) is performed to convert the destination IP of the received packet into the IP of the router 300.

In this manner, the commercial IP of the external network communication network may be converted to a host identification protocol (HIP) of the u-TSN network and transmitted to the corresponding router 300 (S343). This transmission may be performed by a mesh router implemented by the mesh interface of the router 300.

On the other hand, such data may be transmitted directly from the gateway 200 to the roadside terminal 400 (S341), and after the transmission to the router 300, to be finally transmitted to the roadside terminal 400 by the routing of the router 300. It may be.

When a message arrives at the destination router 300 by this routing, the message is transmitted to an application such as a router manager of the destination router 300. The forwarded message includes a host identifier (HID), and the router 300 finds the BSSID of the vehicle terminal 500 by using the host identifier (HID). By doing so, the vehicle terminal 500 which is the final destination of the traffic information can be found (S350).

The router 300, which finds the final destination of the vehicle terminal 500, transmits a message to the vehicle terminal 500 (S360).

The vehicle terminal 500 receives the received data using a host identifier (HID) to check whether the received data is correct for the data to be transmitted, and if the data to be transmitted is transmitted to an application such as a vehicle terminal manager for data. Process (S370), and may display the result of the message transmission or the result of the data processing (S380). Meanwhile, if the data is not to be transmitted, the corresponding data may be transmitted to another vehicle terminal 500 using WAVE based communication.

As described above, the present invention uses a WAVE-based communication method in collecting and providing traffic information, thereby obtaining high data transmission speed and a wide range of service coverage, and collecting and transmitting traffic information through a u-TSN network. As a result, it is possible to build a self-network, and accordingly, it is possible to flexibly cope with network expansion or service expansion. In addition, since the host identifier (HID) is used to collect and transmit traffic information through the u-TSN network, concerns about personal information exposure can be solved.

Meanwhile, by using WAVE-based communication method, traffic information is collected and provided, and control channel and data transmission channel are operated separately for access between mutual communication nodes, so that even if traffic is heavy or high density, It can collect and provide and dramatically increase the number of vehicle terminals that can be connected to the router per second.

Although the present invention has been described by specific embodiments such as specific components and limited embodiments and drawings, it is provided to help a more general understanding of the present invention, and the present invention is not limited to the above embodiments, Those skilled in the art to which the present invention pertains can make various modifications and variations from this description.

Therefore, the spirit of the present invention should not be limited to the embodiments described above, and all of the equivalents or equivalents of the claims, as well as the claims below, are included in the scope of the spirit of the present invention. I will say.

1 is a schematic configuration diagram of an entire system for collecting and providing traffic information according to an embodiment of the present invention.

2 is a flowchart illustrating a process of collecting traffic information in the system of FIG. 1.

3 is a flowchart illustrating a process of providing traffic information in the system of FIG. 1.

<Description of the symbols for the main parts of the drawings>

100: central control server 200: gateway

300: router 400: roadside terminal

500: vehicle terminal

Claims (7)

A network system for collecting traffic information in a u-TSN (Ubiquitous Transportation Sensor Network) network and processing and providing the collected traffic information. One or more vehicle terminals 500 generating traffic information messages by collecting traffic information during stop or movement, and And a router 300 capable of data communication with the vehicle terminal 500 and relaying data communication between the gateway 200 and the vehicle terminal 500 which are accessible to an IP network communication network. The data communication between the vehicle terminal (500) and the router (300) is characterized in that the WAVE (Wireless Access in Vehicular Environment) communication method. The method of claim 1, The WAVE-based communication method is a system characterized in that the communication channel is made of a separate channel and a control channel (data channel) is always available.  The method of claim 1, The communication between the vehicle terminal 500 and the communication between the vehicle terminal 500 and the router 300 use an address defined by a host ID (HID; Host IDentification) of the vehicle terminal 500. A system characterized in that it is made. The network address of claim 1, wherein the gateway 200 translates an address defined by a host identifier (HID) of the vehicle terminal 500, and a network address for interworking between the IP network and the u-TSN network. A system characterized by performing translation (NAT) and network address port translation (NAPT). The method of claim 4, wherein The address defined by the host identifier (HID) may be an IPv6 address system, a dynamic IP using a Dynamic Host Configuration Protocol (DHCP) of an IPv4 address system, or a vehicle in which the vehicle terminal 500 is mounted. System comprising a unique number. The method of claim 1, And a roadside terminal (400) capable of data communication with the vehicle terminal (500) or the gateway (200) by the relay of the router (300). U-TSN including at least one vehicle terminal 500, a router 300 capable of data communication with the vehicle terminal 500, a gateway 200 capable of data communication with the router 300 and connected to a network communication network (ubiquitous Transportation Sensor Network) A method of collecting traffic information in a network and providing the collected traffic information, Exchanging data transmitted and received by the gateway 200 with an IP network communication network with the router 300; And The router 300 exchanging data with the vehicle terminal 500; The data communication between the router (300) and the vehicle terminal (500) is performed by a WAVE based communication method.

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