• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    PURPOSE: A method for providing a wireless internet service is provided to perform the internet service regardless of positions by assigning a mobile IP to a terminal including an internet function. CONSTITUTION: A terminal is registered to a home server for managing a wireless home network region(S101). The terminal receives an IP address and an internet service from the home server(S102). The terminal is registered to an external server for managing a wireless external network region when the terminal is moved to the wireless external network region(S103,S105). The terminal receives an IP address and an internet service from the external server. The assigned IP address is transmitted to the home server in order to update the terminal information registered to the home server(S106,S107).
    公开号:KR20030057019A
    申请号:KR1020010087391
    申请日:2001-12-28
    公开日:2003-07-04
    发明作者:최광주
    申请人:엘지전자 주식회사；
    IPC主号:
    专利说明:

    Wireless Internet Service Method {MOBILE INTERNET SERVICE METHOD}
    [13] The present invention relates to a wireless Internet service method using a dedicated short range communication (DSRC) system for an intelligent transportation system (ITS), and more particularly, to a mobile terminal through a roadside base station device (RSU) and a short range dedicated communication terminal (OBU). By allocating Mobile IP, the present invention relates to a wireless Internet service method that enables continuous Internet service on the go.
    [14] Since 1990, the popularization of automobiles has brought convenience to life in the positive part, but it has accompanied many negative problems such as traffic congestion, accidents and pollution.
    [15] Moreover, the driver does not know why the road on the road is blocked, how long it is available, and the bypass is available, the public transit does not know when the bus arrives and where to change it, and the carrier does not know where to go. I don't know how long it will take, so I can't avoid the congestion path and the confusion is even worse.
    [16] Accordingly, by collecting and efficiently distributing high-quality traffic information, the government facilitates the flow of information between traffic system components, such as roads, cars, and users, to improve disconnected traffic flow and minimize the logistics cost of traffic users. Introduced Intelligent Transport System (ITS).
    [17] In order to perform a service using the intelligent transportation system (ITS), a point-to-point point is provided between a roadside base station unit (RSU) and an on-board unit (OBU) passing through a communication area of the device. There is a need for a technology capable of high-speed communication in both directions by connecting through point-to-point or point-to-multipoint.
    [18] As such, ITS-only short-range wireless communication technology can be classified into a beacon method and a dedicated short-range communication (DSRC) communication method according to its purpose, and the beacon communication method is a relatively low speed (10 Kbps or less) communication system. Because of limited bi-directional communication, ITS-only short-range wireless communication (DSRC) technology has emerged.
    [19] The high-speed DSRC communication can be further divided into a passive method and an active method. In the passive method, the communication cell size is within 10 m, the frequency band uses the 5.8 GHz band, and the maximum data transmission rate is 500 kbps downlink and uplink. Is 250 kbps.
    [20] On the other hand, the active scheme uses the same 5.8 GHz band as the frequency band, but the communication cell size is within 100 m and the maximum data rate is 1 Mbps for both bidirectional links, which supports multiple access between the roadside base station and several vehicle terminals. The distance between the roadside base stations for frequency reuse is more than 60 m, and the cell size is large and the frequency reuse characteristics are superior to the passive method.
    [21] Therefore, the research on the service method using the active DSRC method is mainly focused.
    [22] However, the service using the DSRC has to provide information on the move, so that the functions that can be independently performed at the level of the DSRC system, such as the well-known automation road system, ETC system on the toll road, bus guidance system, etc. Most of the time, its use range is limited.
    [23] Therefore, in order to expand the range of utilization, it is necessary to connect to the Internet network while moving. However, at present, a method for providing a wireless Internet service using an OBU is not specifically presented. There are many difficulties in the provision of services.
    [24] Therefore, the present invention has been created to solve the above-mentioned conventional problems, by assigning a mobile IP (MIP) through the roadside base station device (RSU) and a short-range dedicated communication terminal (OBU) to the Internet-enabled terminal, DSRC system The purpose of this is to provide a wireless Internet service method, so that the Internet service can be performed anywhere.
    [25] In order to achieve the above object, the present invention provides a terminal in a server (home server) that manages a current wireless network area (home network) in order to perform continuous Internet service while moving in connection with a wireless network and an Internet network. Registering and receiving an IP address from the server to use an Internet service; When moving to another wireless network area (external network), a second step of continuously managing the information of the terminal registered in the server (external server) that manages the network area, the home server.
    [1] 1 is a block diagram showing a network configuration for providing an Internet service using a DSRC according to the present invention.
    [2] Figure 2 is a block diagram showing the configuration of a roadside base station apparatus and a vehicle terminal according to the present invention.
    [3] 3 is a flow chart illustrating an internet service method in a DSRC network according to the present invention;
    [4] 4 is an exemplary view showing a structure of a protocol stack for each device for providing a wireless Internet service using a DSRC system according to the present invention.
    [5] 5 is an exemplary view showing a DSRC frame structure according to the present invention.
    [6] 6 is an exemplary view showing the structure of FCMS in FIG.
    [7] 7 is an exemplary view showing the structure of an MDS in FIG.
    [8] 8 is an exemplary view showing the structure of an ACTS in FIG.
    [9] 9 is an exemplary view showing a frame structure of TDMA / TDD and TDMA / FDD schemes.
    [10] 10 is an exemplary view showing a message format between a base station and a vehicle terminal.
    [11] 11 is an exemplary view showing an IP datagram format for an Internet service.
    [12] 12 is an exemplary view showing an IP datagram format for DSRC type internet data transmission.
    [26] In the conventional case, the reason why the Internet connection could not be maintained continuously while using a mobile communication terminal, which is already widely used, is because the existing Internet routing protocol is a kind of Point to Point Protocol (PPP), and thus the host has a different network. This is because the data cannot be sent to the host's new location if it changes to.
    [27] Proposed to solve the above problem is a mobile IP (MIP), which is a routing problem for the movement between the subnet occurs when the network address is changed by the mobile communication terminal, the external subnet called the mobility binding list By maintaining a host-based route assignment entry containing an address, the host can access the Internet even in a mobile environment.
    [28] Therefore, the present invention applies the above-described concept of Mobile IP (MIP) to ITS-only short-range wireless communication technology (DSRC), and notifies the home agent of IP newly allocated to Internet-enabled terminals in a mobile environment. By doing so, the present invention relates to a method of enabling Internet service regardless of a place.
    [29] 1 is a block diagram showing a network configuration for providing an Internet service using a DSRC according to the present invention, as shown in the DSRC wireless network is largely Internet network through an Internet service provider (CN: Correspondent Network) (CN) 100 It may be divided into a home network 200 and an external network 300 connected to the home network 200.
    [30] The home network 200 and the external network 300 are configured in the same system, but the DSRC server managing the network area by the user first attempts to access the Internet acts as an agent, and continuously until the connection to the Internet is lost. The area for managing IP is called a home network, and the other network area is called an external network.
    [31] The home network 200 and the external network 300 operate as gateways (GW (A) and GW (B)) for connecting the DSRC network and the Internet network, respectively, and operate an IP of the vehicle terminal. DSRC servers (HA, FA) to manage, roadside base station apparatuses (RSU (A), RSU (B)), vehicle terminals (OBU (A0), OBU (Bn)), and portable to connect to the Internet It consists of a computer (laptop computer, PDA, etc.).
    [32] In this case, the roadside base station apparatus (RSU) 500 serves as a relay for transferring information between the server 400 and the vehicle terminal 600 in the middle, as shown in FIG. It is composed.
    [33] The control unit includes a multiple access processing unit 501 for wireless connection with a vehicle terminal in a TDMA / TDD scheme, a central processing unit 502 for controlling various peripheral devices included in the roadside base station apparatus, and a transmission apparatus for communication with a server. Network matching unit 503 to provide an interface.
    [34] In addition, the high frequency unit is an antenna 504 for propagating the microwave frequency of the 5.8GHz band sent from the frequency converter 505 to the space, and the frequency of the modulated signal sent from the digital modulation and demodulation unit 506 to a frequency of 5.8GHz band A frequency converting unit 505 for converting, a digital modulation and demodulation unit 506 for performing ASK (Amplitude Shift Keying) modulation and demodulation, and a transmission / reception switch 507 for performing transmission / reception of high frequency signals for performing the TDD method. It includes.
    [35] Next, the vehicle terminal (OBU) 600 includes an antenna 601 for propagating the microwave frequency of the 5.8 GHz band sent from the frequency converter to the space, and a 5.8 GHz of the modulated signal frequency sent from the digital modulation / demodulation unit 603. A frequency converter 602 for converting to a frequency of a band, a digital modulation / demodulator 603 for performing modulation demodulation of ASK (Amplitude Shift Keying) method, and a multiple access processor for wireless connection with a roadside base station apparatus in a TDMA / TDD method 604, a central processing unit 605 for controlling various peripheral devices provided in the vehicle terminal, and a user matching unit 606 supporting a user interface that varies depending on the service purpose of the vehicle terminal.
    [36] In this case, the server 400 manages information on the vehicle terminal sent from the roadside base station apparatus or processes and provides necessary information according to the request of the vehicle terminal.
    [37] Hereinafter, the Internet service method using the DSRC network configured as described above will be described with reference to FIG.
    [38] 3 is a flowchart illustrating an internet service method in a DSRC network according to the present invention.
    [39] For example, when a user who wants to use the Internet service applies for wireless Internet service in the home network 200 area, the DSRC server A managing the home network area plays the role of a home agent (HA), thereby providing a DSRC vehicle. IP address information relating to the terminal OBU A0 is managed (S101).
    [40] Here, the vehicle terminal OBU (A0) serves as a kind of IP (Internet Protocol) port, and the user connects a terminal (portable computer) capable of internet to the DSRC vehicle terminal (OBU (A0)), By accessing the Internet network through the DSRC network is to use the Internet services (S102).
    [41] If the user accessing the Internet from the home network area moves to the external network area as described above (S103), the portable computer connected to the vehicle terminal OBU (A0) is a mobile node (MN: Mobile Node). DSRC server B, which manages an external network area, becomes a foreign agent (FA) and attempts to connect with the vehicle terminal OBU (A0) through a roadside base station apparatus RSU (B) ( S104).
    [42] In addition, the vehicle terminal OBU (A0) is to apply for location registration through the roadside base station device (RSU (B)), the network area managed by the self via the roadside base station device (RSU (B)), The DSRC server B, which has received a position registration (mobile IP) application for the newly entered vehicle terminal OBU (A0), allocates a subnet address to the terminal OBU (A0) (S105).
    [43] That is, when the location registration is performed by assigning the subnet address as described above, the location registration information is transmitted to the DSRC server A which is the home agent HA of the vehicle terminal OBU (A) via the Internet network (S106). .
    [44] That is, the DSRC server managing each network area always launches an agent advertisement in its own network area so that the vehicle terminal entering the area can be assigned a location, that is, a new subnet address of the network area. The newly allocated address information can be registered in the home agent (HA) of the terminal.
    [45] As described above, the home agent HA that has received the new location registration information (mobile IP or mobile network subnet, etc.) of the vehicle terminal moved to the external network area through the Internet network is previously managed. The existing location information (or address information) is updated, and data going to the vehicle terminal OBU A0 is forwarded to the updated new address (S107).
    [46] That is, the data that has been transmitted to the address of the original home network area is forwarded to be transmitted to the actual address of the external network area where the vehicle terminal is currently located (S108).
    [47] Accordingly, the data transmitted to the actual address of the external network area through the Internet network is passed through the gateway GW (B), the DSRC server B, and the roadside base station apparatus RSU (B). (A0)), and the transmitted information is displayed on the screen of the Internet-enabled terminal connected to the vehicle terminal OBU (A0) (S110).
    [48] In other words, data transmitted through the Internet network is a kind of packet data, and its header includes IP address information as a destination to be transmitted. When a terminal requesting data from one network area moves to another network area, The data in response to the request is to send data to the address that originally requested the data.
    [49] However, since the terminal requesting the data has already moved its location, moved to another network area, and has been assigned a new address for the network area, the terminal cannot receive response data, thereby enabling continuous Internet service during the move. It was not there.
    [50] Accordingly, the present invention uses the DSRC server that manages the network area to which the Internet service is first applied as a home agent, and when the terminal receives a new address from the network of the region to which the terminal has moved, the DSRC server manages the network area. Registered by notifying the address and forwarding the data received at the original address to the new address, so that even if the address of the terminal is changed due to the movement, if you register with the home agent, you can continue to use the Internet service. To make it possible.
    [51] For reference, FIG. 4 is an exemplary view showing the structure of a protocol stack for each device for providing a wireless Internet service using a DSRC system according to the present invention. An Internet-enabled terminal (portable computer, etc.) connected to a vehicle terminal (OBU) is shown. ) Is a structure capable of receiving Internet information from an IP server in an external agent (FA), and the air interface between the roadside base station apparatus (RSU) and the vehicle terminal (OBU) has a structure for transmitting Internet data in the LLC layer. have.
    [52] In addition, the DSRC frame for transmitting and receiving messages between the base station and the vehicle terminal in the DSRC system is a frame control message slot (FCMS), a message data slot (MDS) and an activation slot (ACTS), as shown in FIG. In addition, the DSRC frame is used to transmit communication information broadcast, channel request, channel assignment, data transmission and reception information acknowledgment (ACK) messages.
    [53] As shown in the exemplary diagram of FIG. 6, the FCMS (Frame Control Message Slot) includes a Preamble (PR), a Frame Sync Word (FSW), a Signaling (SIG), a Fixed Equipment ID (FID), and a Frame Structure ID (FSI). , Release Timer ID (RLT), Service Code (SC), Control Information of SCI (CI), Link ID (LID), Cyclic Redundancy Check (CRC), Guard Time Start (GTS), and Guard Time End (GTE) .
    [54] The FCMS includes eight slot control IDs (SCIs) each consisting of a CI and an LID.
    [55] As shown in the exemplary diagram of FIG. 7, the MDS (Message Data Slot) is composed of MDC and ACKC, and the MDC (Message Data Channel) includes PR (Preamble), CSW (Channel Sync Word), and MAC (Medium Access). Control (ACK), MSDU (MAC Service Data Unit), CRC (Cyclic Redundancy Check) and the ACK Channel (ACKC) is PR (Preamble), CSW (Channel Sync Word), AI (Acknowledgement ID), CRC (Cyclic Redundancy Check) )
    [56] GT3 (Guard Time 3) exists between the MDS and ACKC, and GT4 (Guard Time 4) exists behind the ACKC.
    [57] As shown in the example of FIG. 8, the ACTS (Activation Slot) is composed of a plurality of ACTCs (Activation Channels), GT5 (Guard Time 5) is present between ACTCs, and GT6 (Guard Time 6) after the last ACTC. This exists.
    [58] The frame structures of the TDMA / TDD scheme and the TDMA / FDD scheme used in the DSRC system are shown in the exemplary diagrams of FIGS. 9A and 9B.
    [59] FIG. 10 is a message format for transmitting an IP datagram to the MSCU in the MDC shown in the example of FIG. Here, the MSDU consists of a total of 65 bytes. The first 1 byte is used for LLC (Logical Link Control) and the next 64 bytes are used for transmitting an IP datagram.
    [60] The IP datagram for providing the Internet service must maintain the message format of FIG. This is because in order to transmit the IP datagram in the DSRC radio section, the LLC must be transmitted as a header before the MSDU divided by 64 bytes.
    [61] MAC in MDC includes message sequence of MSDU and transmits it sequentially, then counterpart device, that is, base station or vehicle terminal, decodes sequence number assigned by MAC and stores it sequentially in memory It is sent by protocol.
    [62] That is, in the embodiment of the present invention, when an Internet service is provided to a vehicle terminal, an Internet-enabled terminal such as a notebook is connected to perform communication using a TCP / IP communication protocol, and an Ethernet connection between a DSRC server and an ISP (Internet Service Provider) is performed. Internet communication is performed by the TCP / IP communication protocol.
    [63] In other words, a protocol stack for an Internet service must be established between an Internet server (ISP) and an Internet-enabled terminal, and an IP server, a base station (RSU), and a terminal (OBU) existing between the Internet server (ISP) and the Internet-enabled terminal are Communicate by passing IP data.
    [64] In addition, the IP datagram for the Internet service in the above manner is shown in the example of FIG. Accordingly, in the DSRC wireless communication, the IP data format for internet data transmission is divided into 64 bytes for transmission as shown in the example of FIG.
    [65] In the above description, many specific details, such as specific processing flows, are provided to provide a more general understanding of the present invention, and are not limited to the above embodiments, and may be expanded in a system for interworking a wireless network and an internet network while moving. It will be apparent to those of ordinary skill in the art.
    [66] As described above, in the wireless Internet service method of the present invention, when a user who uses an Internet service moves to another region through a short-range dedicated communication (DSRC) system for an intelligent transportation system (ITS), even if the actual IP address changes, the first Internet service is performed. The effect is that you can continue to use the Internet service with the same IP address assigned when you start it.
    权利要求:
    Claims (4)
    [1" claim-type="Currently amended] In linking the wireless network and the Internet network to enable continuous Internet service on the go,
    Registering a terminal to a server (home server) currently managing a wireless network area (home network), and receiving an IP address from the server to use an Internet service;
    When moving to another wireless network area (external network), a wireless Internet service comprising a second step of continuously managing the information of the terminal registered in the server (external server) managing the network area in the home server Way.
    [2" claim-type="Currently amended] According to claim 1, If the terminal using the Internet service in the home network area of the second step moves to another network area (external network),
    A first step of registering a terminal in a server (external server) that manages the external network area, and receiving a new IP address from the server;
    And transmitting a newly assigned IP address to the terminal to a home server, and updating the registration information of the terminal registered in the home server.
    [3" claim-type="Currently amended] The wireless Internet of claim 1 or 2, wherein when the home server receives data transmitted to the terminal, the home server forwards the data to the IP address of the newly updated terminal. Service method.
    [4" claim-type="Currently amended] The network management apparatus of claim 1, wherein the server managing the home network and the external network induces registration of a terminal entering the corresponding area by launching an agent advertisement in its own network area. And assigning a subnet address of the wireless internet service.
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    同族专利:
    公开号 | 公开日
    KR100455136B1|2004-11-06|
    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    法律状态:
    2001-12-28|Application filed by 엘지전자 주식회사
    2001-12-28|Priority to KR20010087391A
    2003-07-04|Publication of KR20030057019A
    2004-11-06|Application granted
    2004-11-06|Publication of KR100455136B1
    优先权:
    申请号 | 申请日 | 专利标题
    KR20010087391A|KR100455136B1|2001-12-28|2001-12-28|Mobile internet service method|
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