KR101106493B1 - Method for transmitting data in vehicle to infrastructure communication using multiple ip based on single channel - Google Patents

Abstract

Disclosed is a data transmission method using multiple IPs based on a single channel in V2I communication. The data transmission method according to an embodiment sets a CCH IP and a SCH IP to provide a control channel (CCH) service and a service channel (SCH) service through a single channel, and transmits the set IP information to the vehicle terminal. And performing a V2I communication between the vehicle terminal and the vehicle base station using the transmitted IP. According to the present invention it is possible to improve the reliability and transmission efficiency of the message and data.

Description

전송 Method for Transmitting DATA IN VEHICLE TO INFRASTRUCTURE COMMUNICATION USING MULTIPLE IP BASED ON SINGLE CHANNEL}

The present invention relates to a data transmission method in V2I communication, and more particularly, to a data transmission method using a single channel-based multiple IP in V2I communication that can reduce the complexity of the protocol.

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 flow and technical research on vehicle safety services are ongoing.

A technology that provides ITS service or Internet service by providing communication between a vehicle and a road side unit (RSU, also called a roadside base station) 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 vehicle base station (RSU) to a vehicle using a control channel (CCH) and a service channel (SCH).

1 is a schematic structure of a channel for providing a CCH service and a SCH service through a single channel in a vehicle base station (RSU).

Referring to FIG. 1, a sync interval includes a control channel interval (CCH Interval) and a service channel interval (SCH Interval), the time of the Sync Interval is 100ms, and the control channel interval (CCH Interval). The and SCH intervals are each assigned a time of 50 ms.

In general, the OBU 0 21 of a vehicle running on the road synchronizes with the vehicle vehicle base station RSU during an access interval for accessing the control channel CCH, and then accesses the control channel CCH. Collect control information. The data of the service channel is received during the service channel interval (SCH interval). If OBU 0 (21) preempts control channel (CCH), next OBU 1 (22) and OBU 2 (23) do not synchronize within the access interval of the control channel. There is a problem that synchronization cannot be performed until an access 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.

Meanwhile, in a vehicle communication system, the overhead due to fast data transmission between the vehicle terminal and the vehicle base station is small, and it is necessary to actively cope with data congestion, and furthermore, despite the rapid mobility of the vehicle, the vehicle terminal and the vehicle It is necessary to maintain the connection between the base stations.

Therefore, in order to smoothly provide various traffic information services to vehicle terminals at vehicle base stations, it is necessary to independently provide CCH services and SCH services provided by vehicle base stations regardless of time. There is a need for a data transmission method that can cope with irregular delays caused by congestion control occurring during transmission and reception.

Disclosure of Invention An object of the present invention is to provide a CCH and SCH service based on IP by combining a multiple IP allocation scheme with DCCP, thereby providing a data transmission method using a single channel-based multiple IP in V2I communication that can improve message transmission reliability and data transmission efficiency. To provide.

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 data transmission method using a single channel-based multiple IP in accordance with an aspect of the present invention provides a CCH IP for providing a CCH (Control Channel) service or a SCH (Service Channel) service to a vehicle terminal. And an IP setting step of setting the SCH IP, and an IP transmission step of transmitting the IP information corresponding to the CCH service and the SCH service to the vehicle terminal connected to the vehicle base station by assigning CCIDs to the CCH IP and the SCH IP through a single channel, respectively. And when the vehicle terminal is connected to the vehicle base station, an authentication step of authenticating the vehicle terminal in consideration of mobility of the vehicle and providing CCH data and SCH data to the vehicle terminal using the CCH IP and the SCH IP. can do.

The set IP may be set in consideration of the type and size of data transmitted from the vehicle base station to the vehicle terminal.

A plurality of SCH IPs may be allocated.

The SCH IP may be allocated in consideration of the priority according to the type of the SCH service.

In the IP information transmission step, a delimiter for distinguishing CCH IP information and SCH IP information may be added to the DCCP header.

The IP information transmitting step may further include receiving a Send Ack message from the vehicle terminal when the CCH service is to be provided using the CCH IP among the transmitted IP information.

The authentication step may include receiving a Datagram Congestion Control Protocol (DCCP) connection request message from the vehicle terminal.

The authentication step may include registering the vehicle terminal information with the vehicle base station by receiving an ID of the vehicle terminal, an IP allocated from the vehicle base station, and MAC information of the vehicle terminal from the vehicle terminal.

In the authentication step, when the vehicle terminal releases the connection of the first vehicle base station, moves to the second vehicle base station adjacent to the first vehicle base station, and accesses the first vehicle base station, the IP mapping information between the second vehicle base station and the vehicle terminal is determined. The authentication step may be performed using a mapping table including a.

An IP transmission step of transmitting IP information corresponding to the CCH service and the SCH service provided by the second vehicle base station after performing authentication between the vehicle terminal and the second vehicle base station; And receiving a Send Ack message from the vehicle terminal when the vehicle terminal selects the CCH IP among the IP information.

The first vehicle base station and the second vehicle base station may share the IP mapping information table of the vehicle terminal.

The data transmission method using a single channel-based multiple IP in V2I communication according to an embodiment of the present invention may further comprise the step of periodically monitoring the link status (link status) between the vehicle base station and the vehicle terminal.

The method may further include reconfiguring the CCH IP and the SCH IP using the monitoring result and transmitting the same to the vehicle terminal.

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

According to an embodiment of the present invention, a multiple IP allocation scheme is combined with a DCCP to provide IP-based CCH and SCH services in V2I communication, thereby improving reliability of data transmission and data transmission efficiency.

1 is a schematic structure of a channel for providing a CCH service and a SCH service through a single channel in a vehicle base station (RSU).
2 is a schematic block diagram of a vehicle communication system for transmitting and receiving data using multiple IPs based on a single channel in V2I communication.
3 is a schematic structure of a single channel used in a data transmission method using multiple IPs based on a single channel in V2I communication according to an embodiment of the present invention.
4 is a flowchart illustrating a data transmission method using multiple IPs based on a single channel in V2I communication according to an embodiment of the present invention.
5A through 5B illustrate the format and option fields of a general DCCP packet.
6 is a flowchart illustrating a process of setting a CCH IP and a SCH IP at a vehicle base station.
7 is a flowchart illustrating an authentication process between a vehicle terminal and a vehicle base station.

BRIEF DESCRIPTION OF THE DRAWINGS The advantages and features of the present invention, and the manner of achieving them, will be apparent from and elucidated with reference to the embodiments described hereinafter in conjunction with the accompanying drawings. However, the present invention is not limited to the embodiments disclosed below, but may be implemented in various forms. It is provided to fully convey the scope of the invention to those skilled in the art, and the present invention is defined only by the scope of the claims.

FIG. 2 is a schematic block diagram of a vehicle communication system for transmitting and receiving data using multiple IPs based on a single channel in V2I communication.

Referring to FIG. 2, V2I communication is performed between a vehicle base station (RSU: Road Side Unit 100) and a vehicle terminal (OBU: On Board Unit 200). The V2I communication is based on the Internet Protocol (IP). The vehicle terminal 200 approaching the communication range of the vehicle base station 100 requests a predetermined service, and the vehicle terminal 200 provides a control channel (CCH) service and a service channel (SCH) service in response to the request. Can provide.

The vehicle base station 100 includes a control channel (CCH) service including information on accidents, accidents, and public user traffic safety services based on a CCH IP pre-assigned to the vehicle terminals 200 existing within a short distance of 500 to 1000 m. To provide. In addition, the vehicle base station 100 provides the SCH IP-based Internet, commercial services of general traffic information and surrounding information, multimedia data services, etc., pre-assigned to the vehicle terminal 200 or the group vehicle terminals. The SCH service may be provided using differently allocated IPs (SCH IP 1, SCH IP 2,..., SCH IP N) according to types of services provided.

Meanwhile, both the CCH service and the SCH service may be provided based on a single channel. A schematic channel structure for providing a CCH service and an SCH service from a vehicle base station to a vehicle terminal using the single channel will be described with reference to FIG. 3.

3 is a schematic structure of a single channel used in a data transmission method using multiple IPs based on a single channel in V2I communication according to an embodiment of the present invention.

Referring to FIG. 3, vehicles approaching the communication area of the vehicle base station during the guard interval period may access the vehicle base station. The vehicle base station may transmit a beacon to the vehicles approaching the communication area of the vehicle base station to inform the vehicle driver of the type of service provided by the vehicle base station, connection information, and the like. When the vehicle terminal accesses the vehicle base station during the guard interval, the CCH IP information allocated by the vehicle base station to provide the control channel service and SCH IP information allocated to provide the service channel service (SCH IP 1 and SCH IP 2). , ..., SCH IP N) are loaded together in one channel and transmitted to the vehicle terminal.

4 is a flowchart illustrating a data transmission method using multiple IPs based on a single channel in V2I communication according to an embodiment of the present invention.

2 and 4, when a vehicle traveling on a road approaches the vehicle base station 100, the vehicle terminal 200 inside the vehicle may acquire various traffic information from the vehicle base station 100. ). The traffic information may include general data representing vehicle flow information of a general road, emergency or notice data, and various multimedia data when an accident occurs on the road.

The vehicle base station 100 may use a predetermined channel to provide various information to the vehicle terminal 200 connected to the vehicle base station 100. For example, when the information provided to the vehicle terminal is yugo data, predetermined information is provided through a control channel (CCH), and general data other than the yugo data is generally provided through the service channel (SCH). . However, according to an embodiment of the present invention, both the control channel (CCH) service and the service channel (SCH) service can be provided by using a single channel through a single modem of a vehicle base station. That is, the control channel service and the service channel service can be provided by different IP in the single channel. This allocates bandwidth that can be provided through one channel to a plurality of IPs, thereby providing various types of data services to the vehicle terminal 200 through the allocated IPs.

Accordingly, the modem in the vehicle base station 100 allocates the CCH IP for providing the CCH service to the vehicle terminal 200 in advance, and allocates the SCH IP for providing the SCH service (S110). In this case, one CCH IP may be allocated and a plurality of SCH IPs may be allocated according to the type of SCH service provided. For example, 192.168.0.1 may be set as a CCH IP, and 192.168.0.2 may be set as SCH IP1 and 192.168.0.3 as SCH IP 2. That is, one single channel (bandwidth) can be allocated (distributed) to three different three IPs.

Conventionally, when a vehicle terminal is receiving SCH service through a channel change process after accessing a vehicle base station through a CCH, if CCH monitoring is requested whether additional CCH data is present, ongoing data exchange is performed through the SCH. CCH monitoring was performed by changing the channel state from SCH to CCH. When CCH monitoring was no longer requested, the channel was switched to SCH to resume data exchange. That is, a single channel device capable of performing data exchange in only one RF channel cannot receive data SCH service while performing CCH monitoring.

However, according to an embodiment of the present invention, even if the modem included in the vehicle base station 100 is based on a single channel, one channel is divided into a plurality of channels, and different IPs are allocated to the divided bandwidths, and the allocated IPs are allocated. Through CCH service and SCH service can be provided independently. Accordingly, the CCH can be monitored through the CCH IP without interrupting the SCH service while receiving the SCH service.

A process of setting an IP in the vehicle base station 100 will be described with reference to FIG. 6.

6 is a flowchart illustrating a process of setting a CCH IP and a SCH IP at a vehicle base station. Referring to FIG. 6, the type, size, and priority of data provided to the vehicle terminal 200 may be set in consideration of the type. That is, since a single channel (one bandwidth) is distributed to a plurality of IPs, the bandwidth occupied by each distributed IP may be different. Accordingly, IP may be allocated in consideration of the type, size, and priority of data to be provided to the vehicle terminal.

For example, the type of data may be divided into general data and yugo data (or control data). The note data is CCH data, and general data is SCH data. In addition, the CCH data has a larger data size than SCH data. Therefore, the allocation of the IP according to the type of data and the size of the data determines whether the data to be provided is the CCH data or the SCH data (S111), so that the bandwidth occupied by the CCH IP is larger than the bandwidth occupied by the SCH IP. Can be.

On the other hand, a plurality of SCH IP may be set. That is, the service provided by the vehicle terminal from the vehicle base station may be a simple general traffic information service, or may be a multimedia data service. That is, it may be divided into SCH IP1 for providing general traffic information service and SCH IP 2 for providing multimedia data service.

Accordingly, IP may be allocated such that SCH IP 2 has a bandwidth greater than that of SCH IP 1. In addition, the plurality of IP allocations may be allocated by determining a priority of a provided service (S113) (S114). Priorities among the provided SCH services may be preset and stored in the vehicle base station 100.

2 and 4, when different IPs are respectively set for the CCH service and the SCH service, the set IP information is transmitted to the vehicle terminal 200 approaching the communication area of the vehicle base station (S120). The vehicle terminal 200 may receive control channel service information by selecting a CCH IP among the IP information received from the vehicle base station 100.

Meanwhile, the present invention transmits the allocated IP information from the vehicle base station 100 to the vehicle terminal 200 by adding CCID (Congestion Control ID) information to the IP information using DCCP. The DCCP can guarantee the mobility of the vehicle terminal 200 in the transport layer, and can support ECN (Explicit Congestion Notification) for congestion control and route optimization required by the vehicle base station 100. Therefore, it is possible to periodically check the connection status of IP addresses to important protocols in vehicle communication and record them as active / inactive and reflect them in data communication.

CCID # 3 may be used as the CCID. CCID # 3 is TCP-Friendly Rate Control (TFRC), which increases the data transmission step by step according to the Loss Event Rate.When continuous loss event such as TCP Reno occurs, the transmission rate is reduced by 50%. It is gradually increased to the limit threshold. Such a technique is effective for transmission of control data and multimedia data.

DCCP is a protocol proposed to improve the congestion control which is impossible among the disadvantages of the conventional User Datagram Protocol (UDP), and is reliable in the advantages of data communication using UDP suitable for video or music streaming service. It is a communication protocol combining the advantages of data communication using TCP (Transmission Control Protocol) suitable for data transmission. Therefore, when the vehicle terminal 200 receives the CCH IP and SCH IP information from the vehicle base station 100, the vehicle terminal 200 transmits an ACK signal confirming this to the vehicle base station 100, and congestion control such as TCP can be performed using the vehicle terminal 200. . However, even though the ACK signal is not received from the vehicle terminal 200, the data is not retransmitted, which is like UDP suitable for data communication that does not require reliability, such as a streaming service.

When the vehicle base station 100 transmits the IP information to the vehicle terminal 200, a separator for distinguishing whether the IP information is CCH IP or SCH IP may be added to the DCCP header.

The vehicle terminal 200 may determine whether the IP information is a CCH IP or a SCH IP by checking the DCCP header through the transmitted IP information. If the vehicle terminal 200 intends to receive the CCH service through the CCH IP (S130), the vehicle terminal 200 transmits a confirmation message (Send Ack) indicating that the CCH IP information has been received (S140).

When the transmission process of the IP information is completed, authentication between the vehicle base station 200 and the vehicle terminal 200 is performed (S150), and the CCH data or SCH data is transmitted from the vehicle base station 100 to the vehicle terminal 200 ( S160).

Meanwhile, the present invention transmits a Send Ack signal in order to ensure the reliability of the CCH message, which will be described with reference to FIGS. 5A to 5B.

5A through 5B illustrate the format and option fields of a general DCCP packet.

5A and 5B, the DCCP header 310 may include additional fields 312, which may be additionally included according to the generic header 311 and the type of the packet. It consists of an Option (Option) field used to perform a predetermined function. A portion of the application data 320 to be transmitted is included here to be a DCCP packet 410. The application data 320 may be CCH data or SCH data.

5B shows an option field 420 in a DCCP packet, a type field 321 for indicating the type of option, a length field 322 for indicating the length of the option data field 323, It is composed of an option data field 323 representing data included in the option field 320 according to the type of the option. The type field 321 and the length field 322 are each fixed in size of 1 byte, and the option data field 323 is determined according to the length field. However, the length of the entire option field 320 should be 4 bytes, that is, multiples of 32 bits. If the multiple option fields 320 are not multiples of 4 bytes, padding is performed.

A detailed definition of the DCCP option field 320 is shown in Table 1 below.

type
(Type) Option length
(Option Length) meaning
(Meaning) 0 One padding One One Mandatory 2 One Slow receiver 3-31 One Reserved 32 variable Change l 33 variable Confirm L 34 variable Change r 35 variable Confirm R 36 variable Init cokkie 37 3-5 NDP Count 38 variable Ack Vector [N once 0] 39 variable Ack Vector [N once 1] 40 variable Data Dropped 41 6 Timestamp 42 6/8/10 Timestamp echo 43 4/6 Elapsed time 44 6 Data Checksum 45-127 variable Reserved 128-255 variable CCID-specific option

As shown in Table 1, the length of the option data field 323 is variable until the type 45-127, and no definition of the use of the specific option is made. In the present invention, in order to ensure the reliability of the CCH service, the send Ack information may be included in this portion and transmitted to the vehicle base station 100.

As described above, in the case of Send Ack message transmission for guaranteeing message validity, the DCCP data transmission method is set as an option. However, in the present invention, an independent module for processing the Send Ack message is configured to provide a CCH service. Can be configured as essential rather than optional.

7 is a flowchart illustrating an authentication process between a vehicle terminal and a vehicle base station.

2 and 7, after receiving the IP information from the vehicle base station 100, the vehicle terminal 200 may request a connection to the vehicle base station 100 using the received IP information. The vehicle terminal 200 may search for a SSID (Service Set Identifier) (S151), search for a signal of the vehicle base station 100, and request a connection in a direction of high signal strength.

When the vehicle base station 100 receives a DCCP connection request message from the vehicle terminal 200 (S152), the vehicle base station 100 performs an authentication process between the vehicle terminal 100 and the vehicle terminal 200. When performing the authentication process may be performed in consideration of the mobility (Mobility) of the vehicle (S153).

That is, when the vehicle stops and there is no mobility, the vehicle terminal ID is received from the vehicle terminal 200, the IP assigned from the vehicle base station 200 and the MAC information of the vehicle terminal are received, and the vehicle terminal 200 information is received. In step S155).

When there is mobility of the vehicle, that is, when the vehicle is disconnected from the previously connected vehicle base station (first vehicle base station) and the vehicle moves to the vehicle base station (second vehicle base station) to which the vehicle is currently connected, S155 The authentication process is performed in a different way. If there is no mobility, the authentication time between the vehicle terminal 200 and the vehicle base station 100 can be sufficiently secured, but if there is mobility of the vehicle, authentication in the same manner as in S155 is not efficient, and authentication may fail. The probability is high.

Therefore, in such a case, the authentication process should be easy to perform. The first vehicle base station holds information (vehicle terminal ID, assigned IP information, MAC information, etc.) of the vehicle terminal 200, and may share the information of the vehicle terminal 200 with the second vehicle base station. Therefore, when the second vehicle base station receives the information of the vehicle terminal 200 from the first vehicle base station, the second vehicle base station receives the information of the vehicle terminal 100 received from the first vehicle base station. You can easily perform the authentication process. Information of the vehicle terminal 100 received from the first vehicle base station may be shared in the form of an IP mapping table (Table 2).

Frame structure Size (Byte) Main Content SYNC 2 Motivational message SYNC NU One Sync attempts OBU ID 4 ID of vehicle terminal IPv4 # 1 4 IP of vehicle terminal assigned by vehicle base station IPv4 # 2 4 IP of vehicle terminal assigned by vehicle base station OBU MAC 6 MAC information of vehicle terminal RSU ID 4 ID of the vehicle base station IPv4 4 IP of vehicle base station RSU MAC 6 MAC address of vehicle base station RSU Port One IP base port of vehicle base station OBU Port One IP port of vehicle terminal END One End of one frame in mapping table

As shown in Table 2, the vehicle terminal and the vehicle base station can be provided in a table form by mapping the respective ID, IP, MAC information, etc. Using this mapping table, the vehicle terminal and the vehicle base station can easily perform the authentication process. Can be done.

Such a mapping table can be generated by both the vehicle terminal and the vehicle base station connected to the vehicle base station, can be updated, and can be shared between the vehicle base stations. Therefore, in DCCP-based IP communication, it is possible to reduce the frequency of message transmission for access and release of the vehicle terminal to the vehicle base station, and to simplify the protocol by sharing information on mobility and authentication in the transport layer. .

In the protocol used for vehicle communication of the present invention, the Send Ack part configured as an option in the conventional DCCP protocol is an essential component in the CCH service. In addition, by varying the IP provided for each service to the conventional DCCP protocol, a multi-hopping function through multiple IPs was added. In addition, based on DCCP, ID and IP of the vehicle base station and ID and IP of the vehicle terminal can be mapped to facilitate the authentication process of the vehicle sensitive to mobility.

Accordingly, in V2I communication, the connection area can be extended by applying multi hopping using multiple IPs to the above-described DCCP scheme, and there is an advantage that the connection state can be continuously maintained even while the vehicle is moving. In addition, the CCH and the SCH is provided through a separate independent channel, or when provided in the same channel is a disadvantage in that the continuous CCH or SCH service can not be provided through the process of changing the access channel. The present invention can compensate for the above-mentioned disadvantages by allocating separate IP to provide CCH and SCH services through a single channel of a modem included in the vehicle base station.

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 data transmission method according to an embodiment of the present invention 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 above description, and all changes or modifications derived from the meaning and scope of the claims and their equivalents are included in the scope of the present invention. Should be interpreted.

100: vehicle base station 200: vehicle terminal

Claims (13)

An IP setting step of setting a CCH IP and a SCH IP for providing a control channel (CCH) service or a service channel (SCH) service to the vehicle terminal;
Transmitting an IP information corresponding to the CCH service and the SCH service to the vehicle terminal connected to the vehicle base station by assigning CCIDs to the CCH IP and the SCH IP through a single channel;
An authentication step of authenticating the vehicle terminal in consideration of mobility of the vehicle when the vehicle terminal is connected to the vehicle base station; And
Transmitting CCH data and SCH data to the vehicle terminal using the CCH IP and SCH IP;
Data transmission method using a single channel-based multiple IP in V2I communication comprising a. The method of claim 1, wherein the IP setting step
Setting the IP by considering the type and size of data provided from the vehicle base station to the vehicle terminal;
Data transmission method using a single channel-based multiple IP in V2I communication that includes. The method of claim 1, wherein the SCH IP is
A method of transmitting data using multiple IPs based on a single channel in V2I communication in which a plurality are allocated. 4. The method of claim 3, wherein the SCH IP is
The method for transmitting data using multiple IPs based on a single channel in V2I communication, which is allocated in consideration of priority according to the type of SCH service provided to the vehicle terminal. The method of claim 1, wherein the IP transmission step
A data transmission method using multiple IPs based on a single channel in V2I communication in which a identifier for distinguishing CCH IP information and SCH IP information is added to a Datagram Congestion Control Protocol (DCCP) header. The method of claim 5, wherein the IP transmission step
When the vehicle terminal wants to receive the CCH service using the CCH IP among the transmitted IP information,
Receiving a Send Ack message from the vehicle terminal
Data transmission method using a single channel-based multi-IP in V2I communication that further comprises. The method of claim 1, wherein the authentication step
Receiving a DCCP connection request message from the vehicle terminal
Data transmission method using a single channel-based multiple IP in V2I communication that includes. The method of claim 7, wherein the authentication step
Receiving the ID of the vehicle terminal, the IP allocated from the vehicle base station and MAC information of the vehicle terminal from the vehicle terminal, and registering the vehicle terminal information with the vehicle base station. Data transmission method using multiple IPs. The method of claim 8, wherein the authentication step
When the vehicle terminal releases the connection of the first vehicle base station, moves to the second vehicle base station adjacent to the first vehicle base station, and connects to the second vehicle base station.
Authenticating between the second vehicle base station and the vehicle terminal using a mapping table including IP mapping information between the second vehicle base station and the vehicle terminal.
Data transmission method using a single channel-based multiple IP in V2I communication that includes. 10. The method of claim 9,
After performing authentication between the vehicle terminal and the second vehicle base station,
An IP transmission step of transmitting IP information corresponding to the CCH service and the SCH service provided by the second vehicle base station; And
Receiving a Send Ack message from the vehicle terminal when the vehicle terminal selects the CCH IP among the IP information;
Data transmission method using a single channel-based multiple IP in V2I communication that includes. 10. The method of claim 9,
And the first vehicle base station and the second vehicle base station share the IP mapping information table of the vehicle terminal. The method of claim 1,
Periodically monitoring a link status between the vehicle base station and the vehicle terminal
Data transmission method using a single channel-based multi-IP in V2I communication that further comprises. The method of claim 12,
Reconfiguring the CCH IP and the SCH IP using the monitoring result and transmitting the same to the vehicle terminal
Data transmission method using a single channel-based multi-IP in V2I communication that further comprises.

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