KR100958005B1 - Roaming terminal IP access method and system - Google Patents

Abstract

The present invention relates to proxy mobile IP access processing of heterogeneous roaming terminals.

According to the present invention, a method of performing an IP access to a terminal roaming from a first network to a second network, the method comprising: (a) in response to an IP access request of the roaming terminal with a foreign agent (FA) session established; Transmitting an IP field value of the terminal to a home agent (HA); (b) if the HA is determined to be a roaming terminal from the first network through the received IP field value, extracting the HA address of the first network and transmitting the extracted HA address to the FA; And (c) the FA transmits an IP registration request message to the HA of the first network through the received HA address of the first network, and if the IP of the UE is allocated in the HA of the first network, access the IP through IP tunneling. A method of connecting an IP of a roaming terminal is disclosed.

Mobile IP, Heterogeneous Networks, Handovers, Home Agents

Description

Method and system for connecting IP of roaming terminal {Method and system for connecting IP of roaming terminal}

The present invention relates to a mobile IP connection, and more particularly to a proxy mobile IP connection in heterogeneous network handover.

As mobile communication technology develops, mobile communication users who use mobile data services while on the move are increasing rapidly. A mobile communication user uses a mobile phone or a laptop equipped with a wireless LAN, and the like, and uses a wireless data service by accessing the Internet regardless of a place. In order to use such a wireless data service, users must be assigned an IP address to a terminal and access the network.

The assignment of the original IP address is based on the assumption that the terminal is connected to one particular network and stopped. However, as described above, in order to use the wireless data service while moving, the fixed IP address must be changed. For this purpose, the fixed IP address must be disconnected and then reconnected to receive a new IP address. In this case, continuous wireless data service becomes impossible. In order to solve this problem, a mobile IP protocol is proposed and applied in the Internet Engineering Task Force (IETF) to allow a terminal to communicate with a current IP address.

On the other hand, the communication network for providing the above-mentioned wireless data service is very diverse, such as CDMA network, WCDMA network, wireless LAN network, Wibro network, etc. Recently, the research for providing roaming service between heterogeneous networks by the interworking of these heterogeneous networks is active. Is going on. For example, a CDMA subscriber who subscribes to a service of a CDMA network can access a WCDMA network or a wireless LAN network or a Wibro network and receive a wireless data service without subscribing to a service of a WCDMA network, a wireless LAN network, or a Wibro network. In addition, it can move from heterogeneous network to currently connected network and receive seamless wireless data service.

However, in the case of the mobile IP scheme, there is a burden that the mobile IP stack must be implemented in the terminal. Recently, researches on the proxy mobile IP scheme for accommodating mobility in the network without implementing the mobile IP stack in the terminal have been actively conducted. . In other words, for the existing mobile IP access procedure, a mobile IP stack that performs a mobile IP agent function interworking with a network had to be embedded in a terminal. This is a problem in that the terminal does not have the built-in compatibility with the mobile IP can not be used, and also, if embedded in the terminal causes excessive load on the terminal, the cost of the terminal is raised, etc. .

Due to the advantages described above, in recent years, the proxy mobile IP scheme that accommodates mobility in the network has been widely used. In the case of the proxy mobile IP method, research and development on handover and access methods have been conducted in the same network environment until now, but there are no specific specifications or different methods for interworking between different operators or different networks. There is a situation.

The present invention has been made to solve the above problems, and an object of the present invention is to provide an efficient proxy mobile IP access method and system during handover to ensure mobility between heterogeneous networks.

Other objects and advantages of the invention will be described below and will be appreciated by the embodiments of the invention. Further, objects and advantages of the present invention can be realized by the means and the combination shown in the appended claims.

In order to achieve the above object, the proxy mobile IP access method through interworking between the heterogeneous network home agent according to the present invention, as a method for performing an IP connection to the roaming terminal from the first network to the second network, (a Transmitting an IP field value of the terminal to a home agent (HA) of a second network according to an IP connection request of the roaming terminal established by a foreign agent (FA); (b) if the HA is determined to be a roaming terminal from the first network through the received IP field value, extracting the HA address of the first network and transmitting the extracted HA address to the FA; And (c) the FA transmits an IP registration request message to the HA of the first network through the received HA address of the first network, and if the IP of the UE is allocated in the HA of the first network, access the IP through IP tunneling. It comprises; a.

According to another aspect of the present invention, a system for performing IP access to a terminal roaming from a first network to a second network, wherein the terminal is connected to a home agent (HA) of a second network according to an IP access request of the roaming terminal. Transmits the IP field value of the IP message, and if the resulting message includes the HA address of the first network, transmits an IP registration request message to the HA address of the first network, and the IP of the terminal is allocated from the HA. A Foreign Agent (FA) server that processes IP access through IP tunneling upon receiving an IP registration response message; And performing an IP registration process according to the IP registration request of the FA, and determining whether the terminal roams in another network based on the IP field value received from the FA, and if it is determined that the terminal roams in the first network. There is provided an IP access system of a roaming terminal, including; an HA server extracting an HA address and transmitting the HA address to the FA.

According to another aspect of the present invention, a recording medium on which a program for performing an IP connection to a terminal roaming from a first network to a second network is recorded, and an IP connection request of the roaming terminal with a foreign agent (FA) session established According to the procedure of transmitting the IP field value of the terminal to the HA (Home Agent) of the second network, and if the HA is determined to be a roaming terminal from the first network through the received IP field value, the HA address of the first network The procedure for extracting and transmitting to the FA and the FA transmits an IP registration request message to the HA of the first network through the received HA address of the first network, and if the IP of the terminal is allocated in the HA of the first network, A computer readable recording medium is provided which records a program for executing an IP connection procedure through tunneling.

According to the present invention, by interworking between different heterogeneous home agents, IP connection processing is supported at the time of roaming and handover of terminals, thereby providing an effective proxy mobile IP handover and connection processing between heterogeneous networks. .

In addition, because of the efficient proxy mobile IP access and roaming method between heterogeneous networks, existing infrastructures such as wireless resources or wired networks can be utilized as it is, thereby providing infrastructure recycling and cost saving effects.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. Prior to this, terms or words used in the specification and claims should not be construed as having a conventional or dictionary meaning, and the inventors should properly explain the concept of terms in order to best explain their own invention. Based on the principle that can be defined, it should be interpreted as meaning and concept corresponding to the technical idea of the present invention. Therefore, the embodiments described in the specification and the drawings shown in the drawings are only the most preferred embodiment of the present invention and do not represent all of the technical idea of the present invention, various modifications that can be replaced at the time of the present application It should be understood that there may be equivalents and variations.

1 is a diagram illustrating a network environment for IP access of a roaming terminal according to an embodiment of the present invention. An object of the present invention is to propose interworking of IP access between heterogeneous networks by minimizing change of components constituting the existing network. Therefore, in the present invention, most of the components of the conventional network are used as it is, and the configuration of the nodes that perform the home agent and home agent functions that are merely constructed in each network is improved. Hereinafter, a detailed description will be given with reference to the drawings.

As shown in FIG. 1, a network providing a wireless data service or a wireless Internet service includes a CDMA network 410, a WCDMA network 420, a Wibro network 430, a wireless LAN network 440, and the like. Each network is composed of a wireless access network and a core network connecting the wireless access network and the Internet network. The mobile terminal 601 receives a data service by accessing a content server of an internet network through a core network after accessing a wireless access network. The configuration of each network is as follows.

First, the radio access network of the CDMA network 410 includes a base station (BTS) 411 for managing radio resources, and a base station controller (BSC) 412 for controlling the base station (BTS) 411, the core network Packet Data Serving Node (PDSN) 101 which routes IP packets and performs mobility management of terminals in the area, and local AAA (Authentication, Authorization, and Accounting) that performs subscriber authentication / authorization verification and billing functions. Server 301, and a home agent (HA) server 201 that performs registration processing and management functions of the mobile IP. PCF is not shown in the figure. Preferably, according to the proxy mobile IP scheme, the packet data service node 101 includes a foreign agent (FA) function for managing mobile IP of the terminal.

Next, the wireless access network of the WCDMA network 420 includes a base station (Node-B) 421 for managing radio resources, and a base station controller (RNC) 422 for controlling the base station (Node-B) 421. The core network is connected to the SGSN 423 performing packet data processing, the GGSN 102 connected to the SGSN 423 as a wireless gateway, and the local AAA (Authentication) that performs subscriber authentication / authorization verification and billing functions. Authorization, and Accounting) server 302, HA (Home Agent) server 202 that performs the registration processing and management functions of the mobile IP. In addition, the GGSN 102 preferably includes a FA function.

The wireless access network of the Wibro network 430 controls a RAS 431, which is a base station for transmitting and receiving data by wirelessly connecting to a mobile terminal, connecting the RAS 431 to an external Internet network or various servers, and performing a router function. The core network includes an ACR 103, which is a local AAA server 303 that performs subscriber authentication, authorization verification, and billing functions in conjunction with the RAS 431, and performs registration processing and management of mobile IP. HA (Home Agent) server 203 is included. In the WiBro network 430, it is also preferable that the ACR 103 includes a FA function.

Meanwhile, the wireless access network of the wireless LAN network 440 includes an access point (AP) 441 which is a gateway for interconnecting the mobile terminal 601 and the communication network, and the core network connects through the access point 441. A local router 104 which assigns a fixed IP address to the mobile terminal and performs packet routing, a local AAA server 304 that performs subscriber authentication / authorization verification and billing functions in conjunction with the local router 104, and mobile An HA (Home Agent) server 204 that performs IP registration processing and management functions. It may also include a DHCP server 305 to perform IP assignment in conjunction with the local router 104. In addition, the local router 104 preferably includes a FA function.

In addition, the heterogeneous networks such as the CDMA network 410, the WCDMA network 420, the WiBro network 430, and the wireless LAN network 440 are connected to the Internet 500 through a gateway. Through this, the mobile terminal 601 connected in each heterogeneous network may be connected to the Internet and use a wireless data service through an IP connection. In addition, the mobile terminal 601 moves to another heterogeneous network from the current location to use a wireless data service. For this purpose, the mobile terminal 601 performs a mobile IP access processing procedure through a handover procedure. At this time, in order to apply the proxy mobile IP method, a node performing the FA function of each network performs IP access processing according to the proxy mobile IP method, and the HAs of each network interwork with each other to support IP access and handover. . Here, the home agent provided in each heterogeneous network allocates a mobile IP address (ie, a home address) to the mobile terminal 601 in the mobile IP access process, and the mobile IP address and current location information (CoA: Care of Address). ) Is stored in the mobile binding table, the mobile IP registration process is performed according to the request of the FA, and the data to go to the mobile terminal 601 is tunneled to the FA.

The FA server and the HA server which are the main components of the IP access system of the roaming terminal according to an embodiment of the present invention under the heterogeneous network network environment described above will be described with reference to the accompanying drawings.

2 is a diagram illustrating a configuration of an FA server of an IP access system of a roaming terminal according to an embodiment of the present invention.

Referring to FIG. 2, the FA server 100 according to the present invention is a node that performs IP access processing on behalf of a mobile terminal 601 when the mobile terminal 601 enters a service area and provides a routing service. It includes the function to perform the mobile IP registration process by interworking with the HA of the network and the HA of the external network, respectively. To this end, the FA server 100 includes a terminal IP access module 110, an HA message processing module 120, and a control module 130.

The terminal IP access module 110 performs a role of performing mobile IP access processing on behalf of a roaming terminal that has moved to a service area under its control. The terminal IP access module 110 includes a connection request receiving unit 112, a tunneling forming unit 114, an IP access processing unit 116, and the like. The access request receiving unit 112 serves to receive an IP access request signal from a terminal that has moved to a service area. The IP access request signal includes an IP field value from the terminal. The IP field value is a home address which is an IP address assigned and assigned to a corresponding terminal. The tunneling forming unit 114 forms an IP tunnel with a home agent after mobile IP registration processing in an in-network system to serve as a data transmission path. The IP tunnel is formed through an IP-in-IP tunneling process. The IP connection processing unit 116 forms a tunnel with the HA through the tunneling forming unit 114, and performs an IP connection processing to the corresponding terminal to perform data transmission.

The HA message processing module 120 processes the HA and the mobile IP registration message of the current network or the external network. The HA message processing module 120 includes a mobile IP registration request message transmitter 122 and a mobile IP registration response message receiver 124. The mobile IP registration request message transmitter 122 transmits and processes the mobile IP registration request message to the HA. The mobile IP registration request message transmitter 122 generates a mobile IP registration request message in response to an IP access request of the terminal in the terminal IP access module 110 and transmits the same to the HA. At this time, the IP field value from the terminal is included in the mobile IP registration request message. The mobile IP registration response message receiving unit 124 receives a mobile IP registration response message from the HA in response to the mobile IP registration request.

The control module 130 determines the jurisdiction HA of the mobile terminal to access the mobile IP and accordingly controls the target of the HA message processing module 120 to transmit / receive the message. The control module 130 includes a jurisdiction HA determination unit 132 and an external network HA IP address extraction unit 134. The jurisdiction HA determination unit 132 determines a jurisdiction HA of the mobile terminal that requested the IP access through the mobile IP registration response message received through the HA message processing module 120. That is, if the received mobile IP registration response message includes the HA IP address of the external network, the external network HA of the corresponding address is determined as the jurisdiction HA of the mobile terminal, and if the HA IP address is not included, the current response message The HA that transmits the determination is determined as the competent HA of the mobile terminal. In addition, when it is confirmed that the IP registration process is completed through the mobile IP registration response message, the terminal IP access module 110 notifies that the mobile IP registration process is completed. On the other hand, if it is determined that the competent HA is the HA of the external network, the HA message processing module 120 controls to transmit and process the mobile IP registration request message back to the HA of the corresponding external network. The external network HA IP address extractor 134 extracts the external network HA IP address from the mobile IP registration response message received by the HA message processing module 120 to extract the address. It serves as). Through this, the HA message processing module 120 is used as a destination address when transmitting the mobile IP registration request message again.

3 is a diagram illustrating a configuration of an HA server of an IP access system of a roaming terminal according to an embodiment of the present invention.

Referring to FIG. 3, the HA server 200 according to the present invention manages a current COA and an IP (home address) of the mobile terminal 601 and performs a mobile IP registration process to provide roaming and handover services. In particular, it includes a function of supporting IP roaming and handover between heterogeneous networks through interworking with HA of heterogeneous networks. To this end, the HA server 200 includes a FA message processing module 210, roaming determination module 220, roaming processing module 230, mobile IP registration processing module 240, IP pool DB (250).

The FA message processing module 210 serves to process a mobile IP registration message with an associated FA. The FA message processing module 210 includes a mobile IP registration request message receiver 212 and a mobile IP registration response transmitter 214. The mobile IP registration request message receiving unit 212 performs a role of receiving a mobile IP registration request message including an IP field value, which is an IP assigned to the terminal or an assigned IP, according to an IP access request of the terminal from the associated FA. do. The mobile IP registration response transmission unit 214 performs a process of transmitting a mobile IP registration response message to the FA that has requested a registration after the mobile IP registration processing in the HA.

The roaming determination module 220 determines whether a mobile terminal making an IP access request is a terminal roaming in another heterogeneous network. The roaming determination module 220 includes an IP field extractor 222, an IP pool inquiry unit 224, and the like. The IP field extractor 222 extracts an IP field value, which is a home address posted by the mobile terminal, from the received mobile IP registration request message. The IP pool inquiry unit 224 queries the IP pool DB 250 with the extracted IP field value of the mobile terminal to determine whether the IP of the mobile terminal roams from the HA of the external network. If it is determined that the roaming process is not roaming according to the inquiry result of the IP pool inquiry unit 224, the relevant information is transmitted to the mobile IP registration processing module 240, which will be described later. Roam facts to 230.

When the roaming processing module 230 receives the fact that the roaming determination module 220 determines that the mobile terminal is roaming, the roaming processing module 230 processes the mobile IP registration process back to the HA that had previously managed the corresponding mobile terminal before roaming. That is, the HA IP extractor 232 is provided to extract the external network HA IP address before roaming, which has been responsible for the mobile terminal, from the IP pool DB 250 to be described later, and transfers the address to the FA processing module 210. It is embedded in the mobile IP registration response message and sent to the FA.

When the mobile IP registration processing module 240 receives the fact that the roaming determination module 220 determines that the mobile terminal does not roam, the mobile IP registration processing module 240 performs the mobile IP registration processing according to a general procedure. Therefore, the binding list is not generated when the mobile terminal does not roam.

The IP pool DB 250 is a database that stores and manages external network HA IP address information and IP address information of the mobile terminal managed by the external network HA by interworking with the IP address information allocated to the mobile terminal and the external network HA. . The IP pool DB 250 is divided into a jurisdiction IP pool 252 and an external HA IP pool 254. The jurisdiction IP pool 252 stores and manages information about IPs assigned and assigned by the HA of the current network, and the external HA IP pool 254 stores and manages IP information about HAs of the external network. In this case, when the roaming determination module 220 queries the corresponding IP field value in the IP pool according to the IP field inquiry request and exists in the jurisdiction IP pool 252, it is determined that the roaming determination module 220 is controlled by the HA of the current network that does not roam. Can be. When the IP field value exists in the external HA IP pool 254, it may be determined that the IP field value is controlled by the HA of the previous external network. In addition, when extracting the HA IP from the roaming processing module 230, an IP address of the corresponding HA that manages the roaming terminal stored in the external HA IP pool 254 may be extracted and used.

Hereinafter, a processing procedure performed in an FA server and an HA server of an IP access system of a roaming terminal according to an embodiment of the present invention will be described with reference to the drawings.

4 is a diagram illustrating a processing procedure performed in an FA server of an IP access system of a roaming terminal according to an embodiment of the present invention in order.

Referring to FIG. 4, the FA server first receives an IP access request for using a wireless data service from a mobile terminal connected to a wireless network by roaming to a service area. Alternatively, the position may be moved during the IP connection in the external network and handovered to the current network to receive the IP access request (S11).

In the FA, a process of generating a mobile IP registration request message is performed to request a mobile IP registration to the competent HA of the current network according to the IP access request. In this case, the mobile terminal inserts and includes an IP field value (home address) assigned to the corresponding terminal uploaded when the IP access request is made (S12).

When the mobile IP registration request message including the IP field value is prepared as described above, a procedure of transmitting and processing the HA to the competent HA of the current network is performed.

In accordance with the mobile IP registration request, registration processing is performed in the HA of the current network, and as a result, a mobile IP registration response message is transmitted, and a procedure of receiving this from the FA is performed (S14).

The FA receiving the mobile IP registration response message proceeds to determine whether the received IP includes the HA IP address of the external network. This is to determine whether the IP registration process is performed in the HA of the current network that has requested IP registration or whether the mobile IP registration request is requested to the HA of the connected external network again. That is, it is determined whether the HA of the current network manages the IP of the mobile terminal, and if it is managed by the other network, a procedure of processing a registration request again with the HA of the other network is performed.

In the FA, if it is determined that the message includes the external network IP, the mobile IP registration process is not completed. Therefore, the HA of the external network that manages the IP of the mobile terminal to proceed with the mobile IP registration process is determined. The procedure of transmitting the mobile IP registration request message is performed again. At this time, the destination of the message transmission is set by using the included HA IP address (S16).

In the HA of the external network, the mobile IP registration process of the mobile terminal is completed and the mobile IP registration response message is transmitted, and the FA receives the procedure.

After receiving the message of the completion of the mobile IP registration process, proceed with the procedure of forming an IP tunnel with the HA that has been IP registration process, proceed with the mobile IP connection process to the mobile terminal requesting the IP connection, the terminal is connected to the IP A procedure for enabling a wireless data service is performed. (S18, S19)

FIG. 5 is a flowchart illustrating processing procedures performed in an HA server of an IP access system of a roaming terminal according to an exemplary embodiment of the present invention.

Referring to FIG. 5, first, in the HA, a procedure for receiving a mobile IP registration request message from an associated FA is performed. This message contains the IP field value of the mobile terminal that requested the IP connection (S21).

After receiving the message, the HA proceeds to extract the IP field value included in the message (S22).

Next, a procedure for determining whether the corresponding mobile terminal requesting IP access is a roaming terminal from an external network is performed through the extracted IP field value. At this time, the extracted IP field value is queried to the IP pool DB to check whether the corresponding IP exists in the jurisdiction IP pool, and if not, it is determined to be a roaming terminal in the external network. That is, since the IP of the mobile terminal does not exist in the jurisdiction IP pool, the terminal determines that the IP is registered and managed by the HA of the external network, which can be concluded as a roaming terminal in the external network. Therefore, the mobile IP registration process cannot be completed when the terminal has been roaming, and the mobile IP registration process is requested to the HA of the external network before roaming (S23).

To this end, after determining whether to roam, if it is confirmed that the terminal roamed in the external network, a procedure for extracting HA IP address information of the external network before roaming is performed from the IP pool DB. In this case, in connection with the HA of each heterogeneous network, the HA IP information and the IP pool information managed by the HA are received and stored in the IP pool DB. It can be determined whether or not. (S24)

When the HA IP address information of the external network is extracted, the HA IP address is inserted and included in the mobile IP registration response message to be transmitted to the FA. At this time, since the mobile IP registration process will be performed in the HA of the external network, the HA of the current network does not proceed with the binding list generation procedure.

On the other hand, if it is determined that roaming is not performed, the registration process is performed according to the general mobile IP registration procedure.

When the mobile IP registration response message to be sent to the FA is prepared, it is processed for transmission and the work is completed (S27).

6 is a flowchart illustrating a procedure of an IP access method of a roaming terminal for each node according to an embodiment of the present invention.

Referring to FIG. 6, in the method according to the present invention, a mobile terminal roaming from an external network to a current network first connects to a core network through a wireless network access procedure through a wireless access network. Here, the wireless network access procedure may be variously performed according to each heterogeneous network and the nodes performing the procedure.

Next, the mobile terminal accessing the wireless network requests an IP connection to the FA. In this case, the IP field value uploaded by the mobile terminal is provided together.

In the FA, a mobile IP registration request is made to the competent HA of the current network according to the IP access request of the mobile station. In this case, the IP field value uploaded by the mobile terminal is also included.

In the current network HA, IP registration is processed according to the mobile IP registration request. In addition, the terminal checks that the terminal roams in the external network through the IP field value of the mobile terminal, and queries the HA of the external network before the terminal roams. At this time, both the HA information before roaming and the IP address information of the corresponding HA can be obtained through the IP pool DB that manages HA information and IP address information by interworking with the HA of the external network. As a result, the HA of the current network transmits the response to the mobile IP registration including the roaming HA IP address information of the mobile terminal to the FA requesting the IP registration.

The FA confirms that the mobile terminal roams in the external network and the mobile IP registration process is not completed in the HA of the current network. (5) The mobile IP registration request is made back to the HA before roaming of the mobile terminal through the HA IP address information of the external network.

After receiving the mobile IP registration request, the HA of the external network normally completes the mobile IP registration process and transmits the mobile IP registration response to the FA.

The FA provides a wireless data service that confirms that the mobile IP registration process is completed, forms an IP tunnel with the HA of an external network, and transmits a data packet by IP-connecting the mobile terminal. (7, 8)

7 illustrates an example of a proxy mobile IP access procedure of a terminal roaming from a WiBro network to a WCDMA network according to an IP access method of a roaming terminal according to an embodiment of the present invention.

Referring to FIG. 7, an example of a proxy mobile IP handover or an IP access procedure of a terminal roaming from a WiBro network to a WCDMA network according to an IP access method of a roaming terminal according to the present invention will be described.

Prior to this, an example of an IP access procedure of a terminal roaming from a WiBro network to a WCDMA network will be described. In addition, the main IP access procedure of a terminal roaming between other heterogeneous networks will be the same.

First, a terminal roaming in a wireless network by moving from a WiBro network to a WCDMA network performs a wireless network access process according to a wireless network access procedure with a base station.

After accessing the wireless network, the terminal transmits a PDP context activation / generation request signal through the base station to the GGSN including the FA function to request an IP access. This signal includes the IP information of the terminal as an IP field value. (B, c)

The GGSN receiving the signal performs authentication processing between the AAA server and the terminal. In this case, the authentication request signal for the terminal is transmitted to the AAA server, and the authentication response signal is received after the authentication processing from the AAA server. (D, e)

Next, the GGSN transmits a mobile IP registration request signal to the WCDMA home agent (HA). This signal includes the IP field value of the terminal. (F)

In WCDMA HA, it is confirmed that the IP field value included in the mobile IP registration request signal does not exist in the jurisdiction IP pool, and the mobile IP registration response signal is extracted by extracting HA IP address information of the pre-roaming WiBro network that manages the IP of the terminal. It is included in the response and transmitted in response to the GGSN. (G)

The GGSN confirms that the Wi-Fi network HA IP address information is included in the received signal in response, and sends the mobile IP registration request signal back to the WiBro network HA using this address information. (H)

The GGSN receives the mobile IP registration response signal after the mobile IP registration process is completed from the HA of the WiBro network. (I)

The GGSN confirms that the IP registration process is completed along with the reception of the signal, and transmits a PDP context creation / activation response signal to the terminal via the base station. (J, k)

In addition, the GGSN forms an IP tunnel with the HA of the WiBro network and processes data packet communication of the terminal. (L, m)

The method of the present invention as described above may be implemented as a program and stored in a recording medium (CD-ROM, RAM, ROM, floppy disk, hard disk, magneto-optical disk, etc.) in a computer-readable form. Since this process can be easily implemented by those skilled in the art will not be described in more detail.

Although the present invention has been described above by means of limited embodiments and drawings, the present invention is not limited thereto and will be described below by the person skilled in the art to which the present invention pertains. Of course, various modifications and variations are possible within the scope of the claims.

The following drawings, which are attached to this specification, illustrate exemplary embodiments of the present invention, and together with the detailed description of the present invention serve to further understand the technical spirit of the present invention, the present invention includes matters described in such drawings. It should not be construed as limited to.

1 is a diagram illustrating a network environment for IP access of a roaming terminal according to an embodiment of the present invention.

2 is a diagram illustrating a configuration of an FA server of an IP access system of a roaming terminal according to an embodiment of the present invention.

3 is a diagram illustrating a configuration of an HA server of an IP access system of a roaming terminal according to an embodiment of the present invention.

4 is a diagram illustrating a processing procedure performed in an FA server of an IP access system of a roaming terminal according to an embodiment of the present invention in order.

FIG. 5 is a flowchart illustrating processing procedures performed in an HA server of an IP access system of a roaming terminal according to an exemplary embodiment of the present invention.

6 is a flowchart illustrating a procedure of an IP access method of a roaming terminal for each node according to an embodiment of the present invention.

7 illustrates an example of a proxy mobile IP access procedure of a terminal roaming from a WiBro network to a WCDMA network according to an IP access method of a roaming terminal according to an embodiment of the present invention.

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

100: HA server 200: FA server

410: CDMA network 420: WCDMA network

430: WiBro 440: Wireless LAN

500: internet 601: mobile terminal

Claims (14)

A method of performing an IP access to a terminal roaming from a first network to a second network, (a) a foreign agent (FA) transmitting an IP field value of the terminal to a home agent (HA) of a second network according to an IP access request of the roaming terminal established with a session; (b) if the HA is determined to be a roaming terminal from the first network through the received IP field value, extracting the HA address of the first network and transmitting the extracted HA address to the FA; And (c) The FA transmits an IP registration request message to the HA of the first network through the received HA address of the first network. When the FA is allocated an IP of the terminal, the FA accesses the IP through IP tunneling. Step; IP access method of the roaming terminal comprising a. The method of claim 1, Step (b) is, (b-1) the HA of the second network receiving a mobile IP registration request message including an IP field value from the FA; (b-2) the HA of the second network extracting an IP field value included in the received message to determine whether the HA exists in the IP pool of the second network having jurisdiction; (b-3) In the HA of the second network, if the IP field value does not exist in the jurisdiction IP pool, the HA field address of the first network before roaming is queried by querying the IP field value in the IP pool for HA of another network. Extracting; And (b-4) the HA of the second network includes the extracted HA address of the first network before roaming in a mobile IP registration response message and transmits the FA to the FA; Way. The method according to claim 1 or 2, Step (c) is, (c-1) the FA receiving a mobile IP registration response message from the HA of the second network; (c-2) the FA determining whether the received message includes an HA address of another network; (c-3) if the determination result includes the HA address of the first network, transmitting the mobile IP registration request message back to the included HA address of the first network; And (c-4) The FA receives the mobile IP registration response message from the HA of the first network, and when the IP registration process is completed and it is determined that the IP of the roaming terminal is allocated, the FA and the HA of the corresponding network are IP tunnels. Forming and processing the IP connection of the roaming terminal; IP access method of a roaming terminal comprising a. The method according to claim 1 or 2, The HA of the second network is an IP pool including a jurisdiction IP pool that stores and manages IP addresses of terminals that allocate and control IPs in the current network, and an external HA IP pool that stores and manages information about IPs and IP addresses of the external network. A roaming terminal IP connection method comprising a database. The method according to claim 1 or 2, In step (b), If it is determined that the terminal roams from the first network, the HA of the second network does not generate a binding list. The method according to claim 1 or 2, The second network is a WCDMA network, and the FA is a gateway GPRS Support Node (GGSN) IP access method of a roaming terminal, characterized in that. The method according to claim 1 or 2, The second network is a CDMA network, and the FA is a packet data serving node (PDSN: Packet Data Serving Node) characterized in that the IP access method of a roaming terminal. The method according to claim 1 or 2, The second network is a Wibro (Wibro) network, the FA is an access control router (ACR), characterized in that the IP access method of the roaming terminal. The method according to claim 1 or 2, The second network is a wireless LAN network, and the FA is a local router, characterized in that the IP access method of the roaming terminal. A system for performing an IP access to a terminal roaming from a first network to a second network, When the roaming terminal transmits an IP field value of the terminal to a home agent (HA) of a second network according to the IP access request of the roaming terminal, and as a result, the received message includes the HA address of the first network, the first network. A FA (Foreign Agent) server transmitting an IP registration request message to an HA address of the terminal and performing IP access through IP tunneling when an IP of the terminal is allocated from the HA and receives an IP registration response message; And IP registration processing is performed according to the IP registration request of the FA, and it is determined whether the terminal roams in another network through the IP field value received in the FA, and if it is determined that the terminal roams in the first network, the HA of the first network is And an HA server for extracting an address and transmitting the extracted address to the FA. The method of claim 10, The HA server has an IP pool database including a jurisdiction IP pool that manages IP addresses of terminals that allocate and control IP in the current network, and an external HA IP pool that stores and manages information and IP addresses of HAs of other networks. IP connection system of roaming terminal characterized by the above-mentioned. The method of claim 11, The HA server, if the IP field value received from the FA exists in the jurisdiction IP pool, it is determined that the terminal in the second network jurisdiction, if it exists in the external HA IP pool, it is determined that the terminal roamed in another network IP connection system of roaming terminal to say. The method of claim 10 or 11, The HA server does not generate a binding list if it is determined that the terminal roams in another network. The method of claim 10 or 11, The FA is one of a Gateway GPRS Support Node (GGSN) of a WCDMA network, a Packet Data Serving Node (PDSN) of a CDMA network, an Access Control Router (ACR) of a Wibro network, and a local router of a WLAN network. Any one of the IP connection system of the roaming terminal.

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