KR101043959B1 - Method and apparatus for connecting multi-channel of obuon board unit based v2ivehicle to infrastructure - Google Patents

Abstract

Disclosed is a multi-channel access method of a vehicle to infrastructure (V2I) -based vehicle terminal in an intelligent transportation system. The disclosed method comprises the steps of the On Board Unit (OBU) to communicate with the control channel (CCH) including the Guard Interval (Sync) to communicate, the channel connection of the OBU after the OBU control channel connection Switching the state to a service channel (SCH) separate from the control channel. This provides two-way service to the OBU through a multi-service channel-based access method, and the Road Side Unit (RSU) of the OBU without increasing the complexity of the OBU. It can improve the efficiency of connection and network efficiency.

Vehicle to Infrastructure (V2I), On Board Unit (OBU), Roadside Unit (RSU)

Description

METHOD AND APPARATUS FOR CONNECTING MULTI-CHANNEL OF OBU (ON BOARD UNIT) BASED V2I (VEHICLE TO INFRASTRUCTURE)}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a multi-channel access method and apparatus for a vehicle terminal (OBU) in an intelligent transportation system. The present invention relates to the efficiency of communication between a plurality of on-board units (OBUs) and roadside units (RSUs). The present invention relates to a multi-channel access method and apparatus of a vehicle to infrastructure (V2I) -based vehicle terminal (OBU).

With the advent of the ubiquitous era, the requirement to access desired services anytime, anywhere has been extended to driving vehicles, and in particular, getting information necessary for safe driving in real time has become an important issue. Therefore, while driving from the driver's point of view, information about the speed, location, braking, driving status, and road conditions of the vehicle in the area directly or indirectly connected to the surrounding vehicle is exchanged between the vehicle and the vehicle or the vehicle and the roadside base station. Research on vehicle-to-vehicle (V2V) / vehicle-to-infrastructure (V2V) communication-based services that enable smooth and safe traffic flows and technical research on vehicle safety services are ongoing.

A technology for supporting an ITS service or an Internet service by providing communication between a vehicle and a road side unit (RSU) is a vehicle to infrastructure (V2I) communication technology. In particular, W2 (Vehicle to Infrastructure) based on WAVE (Wireless Access In Vehicle Environment) introduced as a wireless transmission technology that can support up to 54Mbps for vehicles running at speeds up to 200 km / h "V2I" means "V2I" based on WAVE) and provides various services from a roadside station (RSU) to a vehicle using a control channel (CCH) and a service channel (SCH).

As shown in FIG. 1, a vehicle to infrastructure (V2I) communication network basically receives various traffic information services from a Road Side Unit (RSU) 10 and an RSU 10. It consists of a vehicle terminal (On Board Unit, OBU hereinafter 'OBU') (21, 22) inside the vehicle. Since the RSU 10 is installed on the roadside, the RSU 10 has a static characteristic, while the OBUs 21 and 22 are installed in each moving vehicle. Therefore, the OBU which enters the communication range of the RSU 10 requests a service, and the RSU 10 provides a service corresponding to the request through the control channel CCH and the service channel SCH.

The service channel (SCH) provides OBU or group OBU with commercial services of IP-based Internet, general traffic information and surrounding information. The control channel (CCH) provides IP-based WSMP and beacons for short-range OBUs within 500 ~ 1000m. By using the protocol, the traffic safety service for public and accident public users is provided on a broadcast basis.

A process of providing a service to a vehicle through a conventional single channel based RSU will be described with reference to FIGS. 2A and 2B. The synchronization interval is composed of a control channel interval (CCH interval) and a service channel interval (SCH Interval), the time of the synchronization interval (Sync Interval) is 100ms, the control channel interval (CCH Interval) and the service channel interval (SCH) Interval) is assigned a time of 50ms each.

In general, the OBU 0 21 of a vehicle on the road approaches the control channel CCH to synchronize with each other, and receives a service provided from the service channel SCH during the service channel interval SCH Interval. If OBU 0 (21) preempts the control channel (CCH), the next OBU 1 (22), OBU 2 (23) does not synchronize within the corresponding control channel interval (CCH Interval), at least 100ms after the next control channel interval ( There is a problem that synchronization cannot be performed until CCH Interval) arrives. In addition, the OBU which is not synchronized through the control channel CCH cannot receive various traffic information services provided by the service channel SCH.

On the straight road, the delay of several hundred ms between OBU and RSU may not be considered in terms of service. However, at the intersection, a traffic accident may occur due to the service delay of 100 ms between the two devices. Since the synchronization is adjusted in units of seconds, the delay may increase from several hundred ms to 1 second in the OBU having a delay in the service channel (SCH). At the intersection, the OBU and the RSU are delayed depending on the direction of the vehicle, so if the OBU connects to the RSU after 1 second, it will not receive emergency services to ensure the safety of the vehicle, including vehicle accidents and noticed services. There was no problem.

In addition, the vehicle receiving the data of the service channel (SCH) has a problem that does not receive emergency service information provided on the control channel (CCH) at the same time.

That is, the aforementioned problem is caused by the conventional RSU being provided as a single channel based service.

An object of the present invention is a vehicle to infrastructure (V2I) -based vehicle terminal (OBU) that can improve the channel availability and efficiency of a roadside station (RSU) that provides a variety of traffic information services to a plurality of on-board unit (OBU) It is to provide a multi-channel access method.

Another object of the present invention is a vehicle to infrastructure (V2I) -based vehicle terminal (V2I) that can improve the channel availability and efficiency of a roadside station (RSU) that provides a variety of traffic information services to a plurality of On Board Unit (OBU) OBU) provides a multi-channel connection device.

The object of the present invention is not limited to the above-mentioned object, and other objects that are not mentioned will be clearly understood by those skilled in the art from the following description.

According to an aspect of the present invention, a multi-channel access method of a vehicle to infrastructure (V2I) -based vehicle terminal (OBU) according to an aspect of the present invention provides a control channel for providing traffic safety service information to an on-board unit (OBU) A control channel connection step of communicating with a control channel (CCH) by synchronizing to a guard interval of a control channel (CCH), and a channel connection environment of the OBU connected to the control channel; A channel access switching step of switching to a service channel (SCH) separated from a control channel and providing a bidirectional service based on a multiple service channel between a roadside unit (RSU) and the OBU.

The RSU includes a control channel RSU providing the control channel based service and a service channel RSU providing the service channel based service separated from the control channel RSU.

In the control channel access step, a first OBU is connected to a guard interval of a first control channel interval, and the first OBU connected to a guard interval of the first control channel interval is based on a GPS reception time. Synchronizing with the first control channel, receiving a beacon from the RSU by the first OBU, and emergency service information including vehicle accident or notice service information from the control channel RSU to the first OBU Transmitting a step.

The method may further include: synchronizing a second OBU not connected to the first control channel interval with the second control channel after the first control channel interval elapses; And transmitting emergency service information including a vehicle accident or a notice service information from the control channel RSU to the second OBU.

According to an embodiment, the first OBU may be synchronized with the first control channel within a predetermined time for a time of a guard interval.

The channel switching may include connecting the OBU to a guard interval of the service channel and switching a control channel to which the OBU is connected to the service channel at a guard interval of the service channel. Include.

According to another aspect of the present invention, a multi-channel access device of a vehicle to infrastructure (V2I) based vehicle terminal (OBU) provides a control channel (CCH) for providing traffic safety service information to an on board unit (OBU). Dual channel-based roadside base station module (RSU) and the OBU to provide a service based on a control channel (CCH) providing a service based on the two-way traffic safety service or the general commercial service with the OBU And an RSU control unit for controlling channel access of the controller and controlling to provide a corresponding service from the control channel and the service channel to the OBU.

The dual channel based RSU includes a control channel RSU providing the control channel based service and a service channel RSU providing the service channel based service.

The control channel includes consecutive N (N is an integer of 2 or more) control channel intervals, and the service channel includes consecutive N (N is an integer of 2 or more) service channel intervals (SCH Intervals). But

The control channel and the service channel are separated from each other to provide the service independently of the OBU.

The RSU control unit may control to connect the second OBU to the second control channel interval when the first OBU is connected to the first control channel interval and synchronized with the RSU.

The RSU control unit may switch the channel environment of the OBU connected to the control channel RSU to a service channel RSU to provide the service channel based service to the OBU.

Specific details of other embodiments are included in the detailed description and the drawings.

According to the present invention, the connection efficiency and network efficiency of the OBU to the roadside base station (RSU) can be improved without increasing the complexity of the OBU.

Specifically, by using a dual channel based RSU according to the present invention instead of a single channel based base station (RSU), a multi-channel based service capable of using two or more channels simultaneously is possible. That is, it is possible to solve the problem of not being provided with the emergency user service caused by a single channel service that can service one channel at a time, and eliminate the phenomenon that general service is excluded in the process of providing emergency service. .

In addition, it is possible to provide a fast handover by managing an OBU on a road at the base station level. That is, channel access management and channel switching management of a plurality of OBUs on the road may be simultaneously performed through the RSU control unit according to the present invention.

In addition, the service channel (SCH) and the control channel (CCH) may independently provide a corresponding service for a plurality of OBUs.

In addition, by managing the service channel (SCH) and the control channel (CCH) in the RSU control unit it is possible to solve the problem of connection delay to the RSU of the OBU. That is, synchronization problems, channel-to-channel connection problems, and mobility of a plurality of OBUs can be improved.

Advantages and features of the present invention, and methods for achieving them will be apparent with reference to the embodiments described below in detail in conjunction with the accompanying drawings. However, the present invention is not limited to the embodiments disclosed below, but may be embodied in various different forms, and only the present embodiments make the disclosure of the present invention complete, and those of ordinary skill in the art to which the present invention belongs. It is provided to fully inform the person having the scope of the invention, which is defined only by the scope of the claims.

Hereinafter, a multi-channel access method and apparatus of a vehicle to infrastructure (V2I) -based vehicle terminal (OBU) according to the present invention will be described in detail with reference to the accompanying drawings.

3 is a schematic block diagram of a multi-channel access device of a vehicle to infrastructure (V2I) -based vehicle terminal (OBU) according to an embodiment of the present invention.

A multi-channel access device of a vehicle to infrastructure (V2I) -based vehicle terminal (OBU) according to an embodiment of the present invention includes a dual channel-based roadside base station module (Road Side Unit; An On Board Unit (OBU) 200 is included.

The dual channel based RSU 100 provides a control channel (CCH) based service for providing traffic safety service information to the OBU 200 and a bidirectional traffic safety service or general commercial service with the OBU 100. Provides channel-based services.

The dual channel based RSU 100 includes a control channel RSU 110, a service channel RSU 120, and an RSU controller 130. The control channel RSU 110 provides a control channel (CCH) based service and the service channel RSU 120 provides a service channel (SCH) based service. In the present invention, the control channel RSU 110 and the service channel RSU 120 are separated from each other to form an independent module. That is, two modems are configured to allow the control channel (CCH) and the service channel (SCH) to independently provide the corresponding service to the OBU 200.

Control channel (CCH) is a traffic safety dedicated channel in a WAVE (Wireless Access Vehicle Environment) environment, the control channel (CCH) based service is within 500 ~ 1000m from the dual channel based RSU 100 according to the present invention. For vehicles existing on the road, emergency service information, which is essential for the safety of the driver of the vehicle, including accidents, accidents, and public-based user traffic safety services, is broadcasted. The vehicle is equipped with a vehicle terminal (OBU) (200) capable of wireless communication with the RSU, the control channel RSU 110 provides the service information using the WSMP and beacon (beacon) protocol based on IP.

Unlike the service provided by the control channel (CCH), the service channel RSU 120 provides general traffic information or peripheral service information of the roadside base station (RSU) according to the request of the OBU 200, not emergency service information. In particular, in the case of the multimedia download service, individual vehicles download necessary information from the roadside station (RSU) at parking lots, gas stations, and highway rest areas, such as image download services such as maps and guide information, and video download services that provide movie information. There may be. The OBU requests the file it wants, and the RSU updates the list of files owned by the latest one to establish communication with the OBU. In addition, if the file desired by the OBU is not owned by the RSU, the RSU may provide a download service to the OBU by requesting it from a service provider constructed by a wired network.

The RSU control unit 130 manages and maintains channel access to the dual channel-based RSU 100 of the OBU 200, and controls the corresponding service to be provided to the OBU 200. 4A and 4B illustrate respective channel structures provided by the control channel RSU 110 and the service channel RSU 120 according to the present invention in order to explain a process in which the RSU controller 130 controls channel access of the OBU 200. It demonstrates with reference to FIG. 4B.

Referring to FIG. 4A, according to an embodiment, the control channel interval (CCH interval) and the service channel interval (SCH interval) may be slightly changed in each section depending on the service type, but are basically broadcast and unicast, respectively. Provide services based on Therefore, the synchronization between the vehicle terminal (OBU) and the roadside station (RSU) on the road must be synchronized for a short time, and the channel conversion must be performed. This is because the service may be limited when the synchronization time is long.

According to an embodiment, the service providing section for 1 second is set as a superframe in the dual channel based RSU 100. This setting is based on GPS reception time. All vehicles on the road equipped with OBU receive GPS time and coordinate information every second. Based on the GPS reception time, synchronization between the OBU and the dual channel-based RSU 100 is performed, channel conversion is performed, and data is transmitted and received.

Two control channel intervals (CCH intervals) form one synchronization interval (Sync Interval). Similarly, two service channel intervals (SCH intervals) form one sync interval. One sync interval is 100ms, and 10 sync intervals constitute one superframe. One sync interval consists of two sections of a 50 ms control channel interval (CCH interval).

Accordingly, as shown in FIG. 2A, when a 50 ms control channel interval (CCH Interval) passes, a new 50 ms control channel interval (CCH Interval) appears instead of being connected to a service channel interval (SCH Interval). According to the present invention, the control channel (CCH) and the service channel (SCH) are provided independently in different modems. Accordingly, when the first OBU 210 is synchronized with the CCH 01, the second OBU 220 may immediately connect to the CCH 02 and achieve synchronization when a waiting time of 50 ms of the CCH 01 interval elapses. OBU can reduce the time it takes to synchronize with a roadside base station (RSU).

The control channel interval CCH interval (eg, CCH 01 interval 121) includes a guard interval 121_a, a beacon interval 121_b, and a safety interval 121_c.

The first OBU may be synchronized within a predetermined time for a time period between the first control channel and the guard interval. The guard interval is defined in IEEE 802.11p. In the guard interval 121_a, the first OBU 210 synchronizes using GPS time. In this case, the synchronization tolerance time is preferably within 2ms. In the beacon interval 121_b, after the first OBU 210 and the dual channel-based RSU 100 are synchronized through the CCH 01 provided by the control channel RSU 110, the RSU control unit 130 performs a first OBU. The beacon is transmitted to 210, and the first OBU 210 is connected to a WAVE Base Service Set (WBSS). The safety interval 121_c is provided with a variety of WAVE-based services, including accidents, accidents, and public-based traffic safety services provided by the control channel.

The second OBU 220 waits while the first OBU 210 connects to the control channel during the CCH 01 interval 121 and exchanges various control information. That is, it waits for 50ms to try to access another control channel.

After 50 ms, which is the time of the CCH 01 interval 121, the RSU controller 130 changes the channel access environment of the first OBU 210 from the control channel to the service channel. That is, the first OBU 210 is connected to the service channel RSU 120.

Meanwhile, the first OBUs may not receive all the desired services for 50 ms. In particular, when the first OBU requests a multimedia service, the RSU accumulates various information such as video and audio and thus can search for and guide the information as needed. Therefore, the RSU receives all the desired services during the service channel section (50ms). There may be cases where you do not receive. That is, when the first OBU is out of the service area of the dual channel-based RSU (first dual channel-based RSU) to which the first OBU does not receive all the services requested by the first OBU, the first dual channel-based RSU By transmitting this to the neighboring second dual channel based RSU, it is possible to continuously provide an incomplete data service (Partial Data Service).

In this regard, a network system including a dual channel-based RSU coordinator, a middle center (MC), a macrocell manager (MM), and a virtual center (VC) providing a dual channel-based RSU and a location-based service according to the present invention is illustrated in FIG. 7 to be described later.

With continued reference to FIG. 4A, a CCH interval (eg, SCH 02 interval 112) includes a guard interval 112_a, a DIFS interval, an RTS / CTS interval, a DATA interval, and an ACK interval. do. The first OBU 210 switches the channel access environment from the control channel to the service channel during the guard interval 112_a. If the SCH 02 112 is idle during DIFS, the first OBU 210 is connected to the dual channel-based RSU 120 to receive general traffic information provided by the service channel and commercial service information around the road.

When the first OBU 120 switches the channel to the service channel (CCH), the second OBU 220 controls the control channel (CCH) provided by the control channel RSU 110 of the dual channel-based RSU 100, for example, CCH 02 ( Perform a synchronization to access 122). The synchronization and channel access process between the second OBU and the control channel RSU 110 are the same as described above with respect to the channel connection with the first OBU 120 and the control channel RSU 110.

When the second OBU 220 is connected to the control channel and passes 50 ms while exchanging control information, the second OBU 220 is connected to the service channel RSU 130 of the dual channel-based RSU 100 in the same manner as the first OBU 210. For example, traffic information provided by SCH 11 or SCH 12 may be used.

In the above-described embodiment, the description is limited to the first OBU 210 and the second OBU 220 on the road, but the third OBU will perform synchronization to access the CCH 11 interval shown in FIG. 4A, and the fourth The OBU will likewise perform synchronization to the control channel RSU 110 of the dual channel based RSU 100 to access the CCH 12 interval. Meanwhile, as described above, the traffic information service may be provided in the service channel separately from the plurality of OBUs accessing the control channel. That is, if any OBU only connects to the control channel, desired service information can be obtained regardless of the time of connection to the control channel or service channel of another OBU. This is because the control channel and the service channel are provided in different modems. RSU, which is a base station, can improve wireless network access efficiency that can provide control channel information required to a plurality of OBUs at a specific time even when using a single channel structure.

5 and 6 are flowcharts illustrating a multi-channel access method of a vehicle to infrastructure (V2I) -based vehicle terminal (OBU) according to another embodiment of the present invention.

5 and 6, a method of providing a vehicle to infrastructure (V2I) communication service according to an embodiment first includes a control channel RSU 110 in order to connect a plurality of OBUs on a road to an RSU 100 based on a dual channel. For example, the first OBU 210 checks the occupation state of the control channel provided by the control channel RSU 110 (S520), and if the CCH 01 is not occupied, synchronizes with the CCH 01. Try.

The first OBU 210 accesses the connection section of the CCH 01 (first control channel) (S531) and synchronizes based on the GPS reception time (S533). The control channel RSU 110 receives a beacon (S535) and exchanges control information (S540).

When the channel access process with the first control channel is completed, the guard interval of the first service channel is accessed (S551), and the channel access environment of the first OBU is changed from the first control channel to the first service channel (S553). When channel switching to the service channel is completed, service information is received from the first service channel (S561).

When the first OBU 210 completes the connection with the control channel, the second OBU 220 continuously monitoring the dual channel-based RSU 100 attempts to synchronize with the CCH 02 (second control channel). When the synchronization is successfully performed (S530), after receiving and transmitting control information from the control channel RSU 110, the service is provided by the service channel RSU 120 through the process of switching to the service channel, otherwise, for example, When the access to the control channel RSU 110 is restricted by the third OBU, the dual channel-based RSU 100 is continuously monitored (S510).

FIG. 7 is a diagram illustrating a network configuration for providing a service to an OBU in a vehicle to infrastructure (V2I) communication network by applying a plurality of multichannel access devices of a vehicle to infrastructure (V2I) -based vehicle terminal (OBU) illustrated in FIG. 3.

Referring to FIG. 7, a network configuration 700 for providing a service to an OBU in a vehicle to infrastructure (V2I) communication network according to an embodiment includes a vehicle OBE 710, a road control management 720, and an RCM_C ( RCM Coordinator (730), MiddleCenter (MC) 740, Shopping Mall OBE 750, and Virtual Center (VC) 760.

On Board Equipment (OBE) corresponds to the OBU in the present invention. OBE can be largely classified into SOBE (Shopping Street OBE), a terminal device for collecting and transmitting thinker information, and mobile-OBE, a terminal device for transmitting information to a vehicle. That is, SOBE corresponds to OBU.

Road control management (RCM) 720 corresponds to the dual channel-based RSU of the present invention. That is, it includes an interlocking device (corresponding to the RSU control unit 110 in the present invention) capable of separating the service channel and the control channel and control the separated service channel and the control channel. The RCM 720 coordinates a multi-channel operation defined in IEEE 1609.4. In the present invention, the RSU control unit 120 is responsible for this in the dual channel-based RSU 100. In addition, the RCM 720 defines a network layer and a transport layer for secure data exchange between a service provider and a user defined in IEEE 1609.3. Also, the RSU controller 120 in the dual channel-based RSU 100 manages this. do.

The RCM_C (RCM Coordinator) 730 manages and links a plurality of RCM information as an RCM Coordinator. The RCM_C 730 interworks with the RCM 720, performs a location server (LS) function, and provides an LBS service. In addition, specific information according to a region is requested and processed, and receives urgent service information from an upper layer such as the MC 740 and provides it to the RCM 720.

The MC (MiddleCenter) 740 collects RCM_C 730 information, processes the collected information, and is linked with various broadcast equipment.

VC (Virtual Center) 760 is a device interlocking with the existing traffic control center.

Those skilled in the art will appreciate that the present invention can be embodied in other specific forms without changing the technical spirit or essential features of the present invention. For example, a program for realizing a V2I (Vehicle to Infrastructure) communication-based service providing method may be implemented in various forms such as a recording medium in which a program is recorded. It is therefore to be understood that the above-described embodiments are illustrative in all aspects and not restrictive. The scope of the present invention is indicated by the scope of the following claims rather than the detailed description, and all changes or modifications derived from the meaning and scope of the claims and the equivalent concept are included in the scope of the present invention. Should be interpreted.

1 is a schematic block diagram of a conventional vehicle to infrastructure (V2I) communication network.

FIG. 2A is a diagram illustrating a channel access process between an OBU and an RSU in a vehicle to infrastructure (V2I) communication network shown in FIG. 1.

FIG. 2B is a diagram illustrating a channel access process between a plurality of OBUs and RSUs in a vehicle to infrastructure (V2I) communication network shown in FIG. 1.

3 is a schematic block diagram of a multi-channel access device of a vehicle to infrastructure (V2I) -based vehicle terminal according to an embodiment of the present invention.

4A illustrates a channel access process between an OBU and an RSU in a vehicle to infrastructure (V2I) communication network according to the present invention.

4B is a diagram illustrating a channel access process between a plurality of OBUs and RSUs in a vehicle to infrastructure (V2I) communication network according to the present invention.

5 and 6 are flowcharts illustrating a multi-channel access method of a vehicle to infrastructure (V2I) -based vehicle terminal according to another embodiment of the present invention.

FIG. 7 is a diagram illustrating a network configuration of providing a service to a vehicle terminal (OBU) in a vehicle to infrastructure (V2I) communication network by applying a plurality of multichannel access devices of a vehicle to infrastructure (V2I) -based vehicle terminal illustrated in FIG. 3.

`` Explanation of symbols for main parts of drawings ''

100: dual channel based roadside base station module (RSU)

110: control channel (CCH) RSU

120: service channel (SCH) RSU

130: RSU control unit

200: vehicle terminal (OBU)

Claims (14)

On board unit (OBU) is connected to the control channel (CCH) of the control channel (CCH) of the Road Side Unit (RSU) that provides traffic safety service information and the control channel (CCH) and A control channel connection step of communicating; And A channel access switching step of switching a channel access environment of the vehicle terminal (OBU) connected to the control channel to a service channel (SCH) separated from the control channel when an interval time of the control channel elapses; Multi-channel access method of a vehicle to infrastructure (V2I) -based vehicle terminal comprising a. The method of claim 1, wherein after the channel access switching step, Providing a multi-service channel-based bidirectional service to the vehicle terminal (OBU) connected to the service channel Multiple channel access method of a vehicle to infrastructure (V2I) -based vehicle terminal further comprising. The method of claim 1, wherein the RSU, A control channel RSU providing the control channel based service; And Service channel RSU providing the service channel based service Multi-channel access method of a vehicle to infrastructure (V2I) -based vehicle terminal comprising a. The method of claim 1, wherein the control channel Contiguous N (N is an integer of 2 or more) control channel intervals (CCH Interval), the service channel includes consecutive N (N is an integer of 2 or more) service channel intervals (SCH Interval), The control channel and the service channel is separated from each other to provide the service independently to the OBU (Vehicle to Infrastructure) based multi-channel access method of a vehicle terminal. The method of claim 1, wherein the step of connecting the control channel Connecting, by the first OBU, to an access section of the first control channel interval; Synchronizing with the first control channel by the first OBU connected to the access interval of the first control channel interval based on a GPS reception time; Receiving, by the first OBU, a beacon from the RSU; And Transmitting, by the RSU, emergency service information including a vehicle accident or a notice service information to the first OBU; Multi-channel access method of a vehicle to infrastructure (V2I) -based vehicle terminal comprising a. The method of claim 5, Synchronizing a second OBU that fails to access the first control channel interval with a second control channel after the first control channel interval elapses; And Transmitting emergency service information including vehicle accident or yugo service information from the RSU to the second OBU; A multi-channel access method of a vehicle to infrastructure (V2I) -based vehicle terminal further comprising. The method of claim 5, The first OBU is a multiple channel access method of a vehicle to infrastructure (V2I) -based vehicle terminal is synchronized within a predetermined time during the time period between the first control channel and the connection section. The method of claim 1, wherein the channel access switching step Connecting the OBU to an access section of the service channel; And Switching a control channel to which the OBU is connected to the service channel in an access section of the service channel; Multi-channel access method of a vehicle to infrastructure (V2I) -based vehicle terminal comprising a. Control Channel (CCH) based service for providing traffic safety service information to On Board Unit (OBU) and service channel (CCH) for providing traffic safety service or general commercial service bidirectionally with the OBU A dual channel-based roadside base station module (Road Side Unit; RSU) for providing a channel-based service; And And an RSU control unit controlling channel access of the OBU and controlling to provide a corresponding service from the control channel and the service channel to the OBU. V2I (Vehicle to Infrastructure) for switching the channel access environment of the vehicle terminal (OBU) connected to the control channel to a service channel (SCH) separate from the control channel, when the interval of the control channel elapses Multi-channel connection device of base vehicle terminal. 10. The method of claim 9, The dual channel based RSU, A control channel RSU providing the control channel based service; And Service channel RSU providing the service channel based service Multi-channel access device of a vehicle to infrastructure (V2I) -based vehicle terminal comprising a. 10. The method of claim 9, The control channel includes consecutive N (N is an integer of 2 or more) control channel intervals, and the service channel includes consecutive N (N is an integer of 2 or more) service channel intervals (SCH intervals). But And the control channel and the service channel are separated from each other to provide a corresponding service independently to the OBU. 2. 10. The method of claim 9, The RSU control unit, And controlling a second OBU to connect to a second control channel interval when the first OBU is connected to a first control channel interval and synchronized with the RSU. The method of claim 10, The RSU control unit, And converting a channel environment of the OBU connected to the control channel RSU into the service channel RSU to provide the service channel based service to the OBU. A computer-readable recording medium having recorded thereon a program for performing the method of any one of claims 1 to 8.

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