KR100568474B1 - Apparatus and method for mobile ip assignment in efficient network deployment - Google Patents

Abstract

The present invention provides a method for assigning a mobile IP to a user terminal connected to a home network by an integrated agent including both a home agent (HA) function and a foreign agent (FA) function. When the agent request message is received, the MIP agent notification message including the consignment address (COA) information that can be assigned to the user terminal using the FA function unit is transmitted, and when the MIP registration request message is received from the user terminal, the HA function After registering the consigned address consigned address (COA) information in the department, the MIP registration response message is transmitted to the user terminal. When packet data is received from the host, the packet data is transmitted to the user terminal through tunneling between the HA function unit and the FA function unit. The present invention relates to a method and apparatus for providing an improved mobile IP for efficient network configuration. Even if the user terminal exists in the home network, the unnecessary overhead between the user terminal and the gateway can be reduced by using the COA method.

Home network, mobile IP, home agent, external agent, consignment address

Description

Method and apparatus for providing improved mobile IP for efficient network construction {APPARATUS AND METHOD FOR MOBILE IP ASSIGNMENT IN EFFICIENT NETWORK DEPLOYMENT}             

1 is a configuration diagram of a mobile IP network in a wireless LAN according to the prior art.

2 is a view illustrating an IP allocation procedure and a data transmission / reception procedure of a mobile IP network in a WLAN according to the prior art.

3A is a diagram illustrating a configuration of a mobile IP network in a wireless LAN using an integrated agent device according to an embodiment of the present invention.

3B is a schematic block diagram of an integrated agent device according to one preferred embodiment of the present invention.

4 is a flowchart illustrating a mobile IP allocation procedure according to an embodiment of the present invention.

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

105: user terminal

110: access point (AP)

115: foreign agent (FA)

120: home agent (HA)

125: AAA server (Authentication, authorization and Accounting server)

313: MIP (Mobile IP) management unit

320: external agent function

325: home agent function

330: Mobile IP Header processing unit

335: tunneling processing unit

340: IP packet transceiver

The present invention relates to a method and apparatus for providing an improved mobile IP for efficient network configuration. In particular, the present invention relates to an efficient network configuration capable of limiting signaling increase due to frequent handoff occurrence and consequently improving transmission efficiency of the entire network. The present invention relates to a method and apparatus for providing an improved mobile IP for the present invention. With the development of technology and the improvement of the economic level, the number of Internet users is increasing rapidly every year.

In the past, the construction of a wire-based infrastructure, such as a dedicated line installation and a telephone line, was considered a prerequisite for the use of the Internet, but recently, a method of using the Internet that guarantees mobility in wireless-based wireless LAN and wireless data service of CDMA This trend is in the spotlight.

In order to guarantee mobility throughout wired and wireless networks, a method using mobile IP is most commonly used.

Mobile IP (Mobile IP) is a fixed IP that is currently assigned and used without changing the initial assigned IP regardless of where a mobile user terminal such as a laptop or personal digital assistant (PDA) moves. Also, the concept of continuing to receive the corresponding service is applied. In addition, as a technology for enabling the mobile IP concept, services such as home agents (HAs) and foreign agents (FAs) are provided to user terminals (eg, mobile hosts, mobile hosts). There is a mobility support agent providing notification, advertisement, registration, and tunneling.

The mobility support agent moves to another network, leaving the home agent (HA) where the mobile IP based mobile terminal information is registered and the home agent (HA) where the mobile terminal registers its information. There is a foreign agent (FA) that newly registers its own location information. In addition, the basic concept of notification performs a function of detecting whether the user terminal is located in the home agent HA or moved to an external agent FA. In order to provide this function, there are two types of messages. One is an agent advertisement message, which is a message periodically sent by a mobility support agent to manage user terminals in its own network. The agent terminal has an agent solicitation message (agent solicitation message) informing its mobility support agent.

And registration is used to inform the home agent (HA) of its movement so that the user terminal can continuously receive the datagram received from its home agent (HA) even if the user terminal moves to another network. And, when looking at the user access method using the mobile IP that is conventionally made in the wired and wireless Internet environment, the user terminal via the foreign agent (FA), which is a gateway of the visitor network (FA) A method of accessing a home agent (HA), which is a gateway of a home network of a home network, is assigned an IP address.

In general, a method of allocating a mobile IP may be classified into a co-located care of address (CCOA) method and a care of address (COA) method. The COA method is a method in which a user terminal visits a visiting network and accesses a home agent (HA), while the CCOA method is used when the user terminal is in a user's home network. In the conventional mobile IP allocation scheme, when the user terminal is in a user home network, the CCOA scheme is inevitably used. However, the CCOA scheme requires tunneling between the user terminal and the home agent (HA) in comparison to the COA scheme. do. Therefore, the user terminal has a problem that performs a complicated procedure for processing this.

Tunneling process is a necessary process for supporting mobility to mobile IP based user terminals. However, when the external agent FA and the home agent HA are located at a remote location, the processing time is delayed. There was also a problem that occurred. In addition, when hand-off occurs frequently between a user terminal, an external agent (FA), and a home agent (HA), an increase in signaling caused by this causes a problem of lowering transmission efficiency of the entire network. .

In addition, there is a problem that a home agent (HA) and an external agent (FA) having almost similar functions must be provided even in the case of the COA method applied when the user terminal exists in the visitor network.

Accordingly, an object of the present invention is to integrate a home agent (HA) and an external agent (FA), which are important gateways for mobile IP assignment, so that a user terminal exists in a home network. In this case, by providing a care-of address (COA) method, an improved mobile IP providing method and apparatus for an efficient network configuration that can reduce unnecessary overhead between a user terminal and a gateway are provided. will be. Another object of the present invention is to configure an efficient network that can reduce the burden of processing the tunneling (Tunneling) by using a care-of address (COA) method even when the user terminal exists in the home network (Home Network) The present invention provides an improved method and apparatus for providing mobile IP.                         

It is still another object of the present invention to provide a method and apparatus for providing an improved mobile IP for an efficient network configuration by integrating the functions of two gateways (FA) and a home agent (HA) having similar functions. To provide. Another object of the present invention is to provide a method and apparatus for providing an improved mobile IP for efficient network configuration that can be universally applied to all data networks using mobile IP, and can also be used for roaming heterogeneous data networks. To provide.

In order to achieve the above objects, according to an aspect of the present invention, an integrated agent including a HA function to perform the function of a home agent and a FA function to perform the function of a foreign agent (home) A method for assigning a mobile IP to a user terminal connected to a home network, the method comprising: receiving a MIP agent solicitation message from a user terminal, and using the FA function unit Transmitting a mobile IP agent advertisement message (COA) including a care-of address (COA) information to the user terminal to the user terminal, and requesting a MIP registration from the user terminal; Receiving a message (Mobile IP Registration Request Message), wherein the MIP registration request message is set to the care of address (COA); And registering, by the HA function unit, the consigned address referral address (COA) information corresponding to the MIP registration request message received via the FA function unit, and the HA function unit MIP to the user terminal. Provided is a mobile IP providing method comprising the step of transmitting a Mobile IP Registration Request message, and a system, apparatus, and a recording medium for enabling the mobile IP providing method are provided. In addition, the mobile IP providing method according to the present invention comprises the steps of transmitting the packet data received from the HA function to the FA function unit through the tunneling (tunneling), the FA function unit transmits the packet data to the user terminal It may further comprise the step.

In the mobile IP providing method according to the present invention, the MIP registration request message may further include a home agent IP address corresponding to the user terminal, the referral address (COA), and the home agent IP address. If the home agent IP address and the IP address of the integrated agent match, tunneling may be performed between the FA function unit and the HA function unit. In the FA function, the packet data received through the tunneling from the HA function is encapsulated packet data, and the FA function decapsulates the encapsulated packet data. (de-capsulation) may be transmitted to the user terminal.

In addition, in the mobile IP providing method according to the present invention, when the user terminal is connected to a visitor network, the integrated agent may only perform a function as a foreign agent, and may be provided with an external network. When the MIP Agent Solicitation Message is received from an agent, the Aggregation Agent may only function as a Home Agent. According to another aspect of the present invention, there is provided a home network. An integrated agent device for assigning a mobile IP to a user terminal connected to a network, comprising: a receiving unit for receiving a MIP agent solicitation message from a user terminal, and accessing a network provided with the integrated agent; Manages a session with the user terminal, and assigns a care-o address to the user terminal (COA) f) an HA function unit for managing a binding list including an FA function unit for allocating information, a care-of address (COA) information assigned by the FA function unit, and an IP address assigned to the user terminal. And a transmitter for transmitting a MIP agent advertisement message corresponding to the MIP agent solicitation message to the user terminal through a communication network. Is provided.

According to an aspect of the present invention, there is provided a mobile IP allocation apparatus including a tunneling processing unit for performing tunneling between the FA function unit and the HA function unit, a user traffic processing function transmitted and received between the user terminal and the host, and a mobile IP. The apparatus may further include an IP packet transceiver configured to perform a processing function and a function of assigning an IP to the user terminal.

In the mobile IP allocation apparatus according to the present invention, the HA function unit generates encapsulated packet data using the packet data received from the host through the IP packet transceiver unit and provides the encapsulated packet data to the FA function unit. The FA function unit may decapsulate the encapsulated packet data and transmit the decapsulated packet data to the user terminal.

In addition, information of a visitor list managed by the FA function unit and information of a binding list managed by the HA function unit may be shared.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 is a configuration diagram of a mobile IP network in a WLAN according to the prior art, and FIG. 2 is a diagram illustrating an IP allocation procedure and data transmission / reception procedure of the mobile IP network in the WLAN according to the prior art.

Referring to FIG. 1, a mobile IP network in a conventional wireless LAN includes user terminals 105a and 105b (hereinafter referred to as 105), an access point (AP) 110, and an external agent ( Foreign Agent (FA) 115, Home Agent (HA) 120, and AAA Server (Authentication, authorization and Accounting server) 125. Access Point (AP) 110 is a wired LAN A device that converts data into a radio wave of 2.4 GHz and transmits the data to a wireless LAN card, which may correspond to a base station of a mobile communication service system.

The external agent (FA) 115 is a gateway located in an external network (ie, a visitor network) to which the user terminal 105 is connected, and is a home agent (HA) 120 corresponding to the user terminal 105. It is a device that serves to de-tunnel the tunneled packet from and transmit it to the user terminal 105. Since the function and use of the external agent (FA) 115 are well known to those skilled in the art, a detailed description thereof will be omitted. The home agent (HA) 120 manages the current location information of the user terminal 105. The gateway device performs a tunneling function to the external agent (FA) 115. The function and use of the home agent (HA) 120 is also well known to those skilled in the art, so a detailed description thereof will be omitted.

The AAA server 125 measures the network usage to authenticate whether the wireless Internet user is a legitimate user (Authentication), authorize and validate the subscriber's authorization level (Authorization), billing (Accounting) and resource planning. It is a device to perform.

Hereinafter, an IP allocation procedure and a data transmission / reception procedure of a mobile IP network in a WLAN according to the prior art will be described with reference to FIG. 2. However, the access point 110 and the external agent FA before the steps illustrated in FIG. Message authentication code authentication (MAC) is performed between the user terminal 105 and the AAA server 125 via) 115. However, since it is a general matter, it is omitted here.

Referring to FIG. 2, in step 210, the user terminal 210 transmits a mobile IP agent solicitation message to an external agent (FA) 115 via the access point 110. The Mobile IP Agent Solicitation message may be used when the user terminal 105 requests a response without waiting for an Advertisement sent from an external agent (FA) 115 (eg, an Advertisement). Is long). The external agent (FA) 115 sends a MIP Agent Advertisement message to the user terminal 105 at step 215. The Mobile IP Agent Advertisement message is a message used when the external agent (FA) 115 declares its own capability. The MIP agent advertisement message is used by the user terminal. Or periodically transmitted in a multicast or broadcast (Broadcast) method to enable the discovery of the home agent (HA) (120). In addition, the MIP agent advertisement message may allow the user terminal 105 to identify whether the currently connected network is a home network or a visitor network, and the user terminal 105. ) Provides a Care-of Address (COA) that can be obtained. The COA is then the same as the address of the external agent (FA) 115.

In other words, step 210 and step 215 are agent discovery steps, and the presence of the user terminal 105 and the external agent (FA) 115 is determined by an agent discovery message, that is, a MIP agent claim message (Mobile). In step 220, the user terminal transmits a MIP registration request message to an external agent (FA) 115 through an IP Agent Solicitation message and a Mobile IP Agent Advertisement message. send. In step 225, the external agent (FA) 115 transmits a MIP registration request message to the home agent (HA) 120, so that the home agent (HA) 120 transmits the user terminal 105. To decide whether or not to provide services. The mobile IP registration request message includes a request for generation and update of a mobility binding list of the home agent (HA) 120.

The home agent (HA) 120 registers a Care-of Address (COA) corresponding to the user terminal 105 (stores mobility information of the user terminal 105), and then, in step 230, a MIP registration response message (Mobile IP). Registration Response message) is transmitted to the external agent (FA) 115.

The external agent (FA) 115 stores information in a cached list indicating that the user terminal 105 is connected to its own network and is to be provided with a service. 120 transmits a MIP registration response message to the user terminal 105. Through this procedure, the user terminal 105 is provided with an environment in which the service can be provided from the host 205. In other words, step 220 to step 235 is a registration process, and an access point of the user terminal 105 is provided. -of-attachment) is a process of informing the COA of the user terminal 105 to the home agent (HA) 120.

Subsequently, in step 240, IP packet transmission and reception is performed between the user terminal 105 and the host 205 to which the user wants to connect.

In this case, when the host 205 delivers a datagram to the user terminal 105, the host delivers a datagram (IP packet) to the home agent (HA) 120, and the home agent (HA) ( 120 reads the mobility information it has and delivers an encapsulated packet through tunneling to the external agent (FA) 115 to which the user terminal 105 has moved, and the external agent (FA) 115 removes the encapsulated information and delivers the original service information to the user terminal 105.

Then, when the user terminal 105 is provided with a new COA by accessing a new visitor network, the home agent (HA) 120 performs a binding update operation so that the user can continue to use the wireless Internet. As described above, when the user terminal 105 is connected to a visitor network, packet data transmission and reception between the user terminal 105 and the host 205 may be performed by an external agent (FA) 115 and a home agent. (HA) is made through tunneling of 120.

However, when the user terminal 105 exists in the home network, the user terminal 105 does not need to connect to the external agent (FA) 115 but directly connects to the home agent (HA) 120. There is no tunneling between the HA) 120 and the foreign agent (FA) 115, and mobile IP implementation is possible without the assistance of the foreign agent (FA) 115. That is, when the user terminal 105 exists in the home network, IP allocation and data transmission / reception of the mobile IP network are performed by a Co-located COA (CCOA) method.

The user terminal 105 transmits a Mobile IP Agent Solicitation message and a Mobile IP Registration Request message to the home agent 120 without passing through the external agent (FA) 115. And a MIP agent advertisement message and a MIP registration response message from the home agent HA. The user terminal 105 is assigned an IP address belonging to a temporary external network, and packet data transmission and reception between the user terminal 105 and the host 205 is performed by the user terminal 105 and the home agent (HA) 120. Through tunneling, the user terminal 105 becomes a de-tunneling point of the encapsulated datagram. However, in case of the CCOA scheme, since the tunnel endpoint is the user terminal 105, there is a problem in that packet overhead on the radio is larger than that of the COA scheme.

As described above, in the conventional WLAN, the IP allocation and data transmission / reception methods of the mobile IP network are applied when the user terminal 105 is in the user home network. The CCOA method is the user terminal 105 and the home agent (HA) 120. Tunneling is required between the terminals, so that the user terminal 105 performs a complicated procedure. In the case of the COA method applied to the case where the user terminal 105 exists in the visitor network, the home agent (which has almost the same function) is used. The HA and the external agent (FA) must be provided, and the tunneling process necessary for supporting mobility to the mobile IP-based user terminal includes the external agent (FA) 115 and the home agent ( If the HA) 120 is located at a remote location, there is a problem that causes a delay in processing time.

However, the improved mobile IP providing method and apparatus for efficient network configuration according to the present invention can solve this problem. Hereinafter, the improved mobile IP providing method and apparatus for efficient network configuration according to the present invention will be described. Let's do it.

3A is a block diagram of a mobile IP network in a WLAN using an integrated agent device according to an embodiment of the present invention, and FIG. 3B is a schematic diagram of an integrated agent device according to an embodiment of the present invention. It is a block diagram.

Referring to FIG. 3A, a mobile IP network configuration in a wireless LAN according to the present invention includes user terminals 105a and 105b (hereinafter referred to as 105) and an access point (AP) 110a and 110b. (Hereinafter referred to as 110), integration agents 310a, 310b-hereafter referred to as 310).

The user terminal 105 is a device that can be provided with Internet service through a wireless communication network while the user is on the move. In FIG. 1, only a notebook computer and a personal digital assistant (PDA) are illustrated, but the same function is provided. Naturally, it can be applied without limitation if it can be performed.

The integrated agent 310 is a device configured by integrating the functions of the home agent (HA) 120 and the external agent (FA) 115 in the mobile IP network according to the prior art, the block diagram of the integrated agent shown in Figure 3b Is shown.

Referring to FIG. 3B, the integration agent 310 includes a mobile IP (MIP) manager 313 and a user traffic processor 315. Although not shown in FIG. 3B, the integration agent 310 may function as a router such as a home agent (HA) 120 or an external agent (FA) 115, and a wireless function of a user. The authentication and billing data processing unit for performing authentication and billing data transmission and reception with the AAA server 125 may be further included for billing of service use. The MIP (Mobile IP) management unit 313 may be an external agent function unit 320. (Hereinafter referred to as FA function unit), home agent function unit 325 (hereinafter referred to as HA function unit), and MIP header (Mobile IP Header) processing unit 330.

The FA function unit 320 is a means for performing the function of the above-described foreign agent (FA), and manages a session with the user terminal 105 connected to the network provided with the integrated agent 310. The HA function unit 325 is a means for performing the function of the home agent (HA) described above, and manages a binding list in which an actual IP is allocated to the user terminal 105.

As shown in FIG. 3B, the integration agent 310 according to the present invention transmits and receives data between the FA function unit 320 and the HA function unit 325 so as to obtain a mobile IP even if there is no separate tunneling. In addition, the FA function unit 320 and the HA function unit 325 of the integration agent 310 according to the present invention each have a DHCP function, and each non-overlapping unique IP pool (IP) can be processed. Pool) has a band.

DHCP (Dynamic Host Configuration Protocol) refers to an automatic address acquisition protocol. By dynamically allocating an IP address during the operation of the user terminal 105, the operational problem caused by the address setting is solved. About 60 kinds of information such as sites can be notified to clients.

Dynamically assigning IP addresses is the same as Bootstrap protocol (BOOTP), but the address value itself is also dynamically determined and can be used to save the address if the number of user terminals 105 is greater than the number of available IP addresses. Has

When the MIP header processing unit 330 receives a wireless Internet access request from the user terminal 105, the MIP header processing unit 330 registers a COA between the FA function unit 320 and the HA function unit 325, and the user terminal through the IP packet transceiver unit 340. It performs a function of managing header information of data transmitted and received during the packet transmission and reception process between the 105 and the host 205. The user traffic processing unit 315 is a tunneling processing unit 335 and an IP packet transmission and reception unit. 340.

The tunneling processing unit 335 performs tunneling between the FA function unit 320 and the HA function unit 325 so that the user terminal 105 may receive IP packet data from the host 205, and the IP packet transmission / reception unit 340. ) Performs the function of user traffic processing, mobile IP processing, and assigning IP to the user terminal 105, and also calculates the packet usage of each user terminal 105 to authenticate and charge processing unit (not shown). As described above, the integrated agent 310 according to the present invention can perform both functions as a home agent (HA) 120 and an external agent (FA) 115, so that an efficient network is provided. It is possible to configure, and also to prevent unnecessary signaling increases.

In addition, although the integrated agent 310 according to the present invention includes both functions as a home agent (HA) 120 and an external agent (FA) 115, in each case, the home agent (HA) 120 or an external agent. It is also possible to perform unique functions to the agent (FA) 115.

If it is determined that the user terminal 105 connected to the network equipped with the integrated agent 310 is connected to the visitor network, only the FA function unit 320 is operated, and if connected to another gateway (that is, another external agent). If a user terminal 105 sends a MIP Registration Request message for the integration agent 310 to operate as a home agent (HA) 120, the integration agent 310 is a FA function unit 320. ) And only the HA function unit 325 among the HA function unit 325 operate.

An example of the visitor list managed by the FA function unit 320 is shown in Table 1 below.

Table 1. Visitor list of FA functions

IP address of the integration agent: 10.101.0.1 IP pool of FA function: 10.101.1.1-10.101.10.255 IP pool of HA function: 10.101.21.1-10.101.30.255 INDEX ID IP address assigned to the terminal Home agent Tunneling One 00: 00: 0A: 00: 00: 01 10.101.51.43 10.103.0.4 Reverse 2 016-123-4567 10.101.4.58 - - 3 user 10.101.23.22 10.101.0.1 Forward 4 user1 10.105.4.99 10.105.0.1 Forward

In Table 1, the ID is information (eg, ID, MAC address, phone number, e-mail, etc.) for the FA function unit to recognize the user terminal 105 after the user terminal authentication is completed. Entry number of the same domain type).

In Table 1, the INDEX 1 'is a home agent (HA) 120 of the home network IP address 10.103.0.4 after the user terminal 105 accesses the visitor network through the integration agent 310. It means the case of connecting. That is, this case means that the integration agent 310 according to the present invention performs only a function as an external agent.

In addition, in the above-described Table 1, INDEX 2 'is the FA agent 320 of the integration agent 310 according to the present invention does not operate as a mobile IP (Mobile IP) allocation device, but acts as a pure DHCP server, In this case, IP (that is, simple IP) is allocated from the IP pool. Therefore, in this case, the Home Agent field is blank.

In addition, in Table 1, the INDEX 3 'is a case where the visitor network and the home network coincide. The network visited by the user terminal 105 is the home network (that is, the COA (Care of Address) and the IP address of the home agent). (Home agent IP Address) is matched, information of the visitor list of the FA function unit 320 and the binding list of the HA function unit 325 is shared, and the corresponding user terminal 105 is tunneled ( A mobile IP service can be provided without tunneling.

Next, look at an example of the binding list managed by the HA function unit 325 is shown in Table 2 below.

Table 2. Binding list of HA functions

IP address of the integration agent: 10.101.0.1 IP pool of FA function: 10.101.1.1-10.101.10.255 IP pool of HA function: 10.101.21.1-10.101.30.255 INDEX ID IP address assigned to the terminal Consignment address COA / CCOA One 00: 00: 01: 0D: 0C: 07 10.101.26.12 10.109.0.1 COA 2 Guest1 10.101.25.99 10.107.0.7 CCOA 3 user 10.101.23.22 10.101.0.1 COA

INDEX 1 ′ in Table 2 above shows a case in which the integration agent 310 according to the present invention performs only a function as a home agent (HA) 120.

Also, in Table 2, INDEX 3 'is a case where the visitor network and the home network match, and since the network visited by the user terminal 105 is a home network (that is, a care of address (COA) and an IP address of a home agent (Home) agent IP Address), information of the visitor list of the FA function unit 320 and the binding list of the HA function unit 325 are shared, and the corresponding user terminal 105 is tunneled. The mobile IP service can be provided without.

4 is a flowchart illustrating a mobile IP allocation procedure according to an embodiment of the present invention.

However, before the step shown in FIG. 4, a MAC process (Message authentication code Authentication) is performed between the user terminal 105 and the AAA server 125 via the access point 110 and the external agent (FA) 115. However, this is general and is omitted here.

Referring to FIG. 4, in operation 410, the user terminal 210 transmits a mobile IP agent solicitation message to the integration agent 310 via the access point 110.

The aggregation agent 310 sends a MIP agent advertisement message to the user terminal 105 in step 415.

In operation 420, the user terminal 105 transmits a MIP registration request message to the integration agent 310. In step 425, the integration agent performs a MIP registration operation (that is, the HA function unit 325 registers a care-of address corresponding to the user terminal 105 (stores mobility information of the user terminal 105). After that, the process proceeds to step 430 to transmit a MIP registration response message to the user terminal 105.

Thereafter, in step 435, IP packet transmission and reception is performed between the user terminal 105 and the host 205 to which the user wants to connect.

In this case, when the host 205 transfers a datagram from the host 205 to the user terminal 105, when the host 205 transmits the datagram to the IP packet transceiver 340, the tunneling processor 335 transmits the datagram. Tunneling is internally performed between the function unit 325 and the FA function unit 320 so that the corresponding datagram is transmitted to the user terminal 105.

Referring back to the mobile IP allocation procedure described with reference to FIG. 4, since the integrated agent 310 according to the present invention includes both the home agent and the external agent, whether the user terminal 105 is connected through a COA scheme. You already know if you will be connecting via CCOA. Accordingly, when the user terminal 105 accesses the HA function unit 325 in the home network, the user terminal 105 may access the FA function unit 320 in the COA method instead of allocating the mobile IP by the CCOA method. .

The same information is included in fields of a care of address and a home agent address in a MIP registration request message, and the corresponding information is the IP of the integration agent 310. If the IP address is identical, tunneling may occur internally between the FA function 320 and the HA function 325 in the integration agent 310. Accordingly, the user terminal 105 Is present in the home network, it is not necessary to handle the tunneling (tunneling) between the user terminal 105 and the home agent, it is possible to efficiently packet relay (packet relay).

However, when the user terminal 105 does not exist in the home network and is in the visitor network, the home agent and the external agent are operated separately and the mobile IP of the conventional general COA method. )

In other words, if the visitor network and the home network does not match, the integrated agent 310 according to the present invention operates as if the FA function unit 320 or the HA function unit 325 operates independently and is a home agent or an external agent. (See Figure 2).

In this case, if the network to which the user terminal 105 is connected is a visitor network including a first integrated agent (that is, acting as an external agent), and the second integrated agent is connected to the home network corresponding to the user terminal 105. (Ie, acting as a home agent), the MIP registration request message (Mobile IP registration request) sent from the user terminal 105 is transmitted to the second integration agent through the first integration agent.

The MIP registration request message includes a care of address (COA), and the COA is an IP address value of the FA function unit 320 of the first integrated agent. In this case, the Home Agent IP Address value is the IP address of the second integrated agent.

Therefore, in the structure in which the home agent and the external agent are integrated, the COA flag is turned on among the values of the header of the Mobile IP Registration Request message. If the values of the care of address and the home agent IP address are the same, the home agent and the external agent operate in a unified form. If the two values are different, each home agent or home agent is unique. The present invention is not limited to the above embodiments, and many variations are possible by those of ordinary skill in the art within the spirit of the present invention.

As described above, the improved mobile IP providing method and apparatus for efficient network configuration according to the present invention are two gateways important for mobile IP allocation, a home agent (HA) and an external agent (FA). In this case, even when the user terminal exists in the home network, the unnecessary overhead between the user terminal and the gateway can be reduced by using a care-of address (COA) method.

In addition, the present invention can reduce the burden of the user terminal processing tunneling (Tunneling) by using a care-of address (COA) method even when the user terminal exists in the home network (Home Network).

In addition, the present invention enables an efficient network configuration by integrating the functions of two gateways having a similar function, an external agent (FA) and a home agent (HA).

In addition, the present invention can be universally applied to all data networks using Mobile IP, and can also be used for roaming heterogeneous data networks.

Claims (14)

An integrated agent including an HA function that performs the function of a home agent and an FA function that performs the function of a foreign agent moves to a user terminal connected to a home network. In the method of allocating IP), Receiving a MIP Agent Solicitation Message from a user terminal; Transmitting a mobile IP agent advertisement message (COA) including a care-of address (COA) information that can be assigned to the user terminal by using the FA function unit; Receiving a Mobile IP Registration Request message from the user terminal, wherein the MIP registration request message includes the referral address (COA) information; Registering, by the HA function, the referral address (COA) information corresponding to the MIP registration request message received via the FA function; Transmitting, by the HA function, a MIP registration request message to the user terminal; Mobile IP providing method comprising a. The method of claim 1, Transmitting, by the HA function, the packet data received from the host to the FA function through tunneling; Transmitting, by the FA function, the packet data to the user terminal Mobile IP providing method characterized in that it further comprises. The method of claim 1, The MIP registration request message further comprises a home agent IP address corresponding to the user terminal. The method of claim 3, If the coordinating address (COA), the home agent IP address (IP) and the IP address of the integrated agent match, tunneling (tunneling) is formed between the FA function unit and the HA function unit. How to provide mobile IP. The method of claim 1, And the packet data received by the FA function through tunneling from the HA function is encapsulated packet data. The method of claim 5, The FA function unit decapsulates the encapsulated packet data and transmits the encapsulated packet data to the user terminal. The method of claim 1, And when the user terminal is connected to a visitor network, the integration agent performs only a function as a foreign agent. The method of claim 1, If the MIP agent solicitation message (Mobile IP Agent Solicitation Message) is received from an external agent provided in the other network, the integration agent performs a function only as a home agent (Mobile Agent), characterized in that the mobile IP providing method. An integrated agent device for assigning Mobile IP to a user terminal connected to a home network, the integrated agent device comprising: a receiving unit receiving a MIP agent solicitation message from a user terminal; A FA function unit for managing a session with the user terminal connected to a network provided with the integrated agent and assigning care-of address (COA) information to the user terminal; An HA function unit that manages a binding list including binding address (COA) information assigned by the user and an IP address assigned to the user terminal; Transmission unit for transmitting a MIP agent notification message (Mobile IP Agent Advertisement message) corresponding to the MIP agent solicitation message (Mobile IP Agent Solicitation Message) to the user terminal through a communication network Mobile IP allocation device comprising a. The method of claim 9, A tunneling processor configured to perform tunneling between the FA function unit and the HA function unit; IP packet transmission and reception unit performing a user traffic processing function, a mobile IP processing function, and an IP allocation function to the user terminal transmitted and received between the user terminal and the host. Mobile IP allocation device, characterized in that it further comprises. The method of claim 9, wherein the HA function unit generates encapsulated packet data using the packet data received from the host through the IP packet transceiver, and provides the encapsulated packet data to the FA function unit. And the FA function unit de-capsulates the encapsulated packet data and transmits the encapsulated packet data to the user terminal. The method of claim 9, And information of a visitor list managed by the FA function unit and information of a binding list managed by the HA function unit are shared. A program of instructions that can be executed by an integrated agent device for performing a mobile IP providing method is tangibly implemented, and in the recording medium that can be read by the integrated agent device, Receiving a Mobile IP Agent Solicitation Message (MIP Agent Solicitation Message) from the user terminal; MIP agent notification including Care-of Address (COA) information that can be assigned to the user terminal using the FA function unit Transmitting a message (Mobile IP Agent Advertisement message); Receiving a Mobile IP Registration Request message from the user terminal, wherein the MIP registration request message includes the referral address (COA) information; Registering, by the HA function, the referral address consignment address (COA) information corresponding to the MIP registration request message received through the FA function; Transmitting, by the HA function, a MIP registration request message to the user terminal; Recording medium that records a program that can run. The method of claim 13, further comprising: transmitting, by the HA function, packet data received from a host to the FA function through tunneling; Transmitting, by the FA function, the packet data to the user terminal Recording medium that records a program that can run more.

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