KR100411898B1 - The Method of Interface between Foreign Agent and GGSN, Gateway GPRS Support Node - Google Patents

Abstract

1. TECHNICAL FIELD OF THE INVENTION

The present invention relates to an interface method between an external agent (FA) and a gateway GPRS support node (GGSN) and a computer-readable recording medium having recorded thereon a program for realizing the method.

2. The technical problem to be solved by the invention

The present invention provides a method and an interface for providing an interface between an external agent (FA) and a gateway GPRS support node (GGSN) independently of a platform while minimizing modification of existing standards to provide a mobile IP service in a wireless communication network. Provided is a computer readable recording medium having recorded thereon a program for realization.

3. Summary of Solution to Invention

The present invention relates to an interface method between an external agent (FA) and a gateway GPRS support node (GGSN), wherein the gateway GPRS support node (hereinafter referred to as "GGSN") and the external agent (hereinafter referred to as "FA") are separated and operated as independent nodes. A first step of making; A second step in which the GGSN and the FA configure a signaling message format to support an IP service and interface a signal using IP / UDP; And a third step in which the GGSN and the FA configure a traffic message format to support an IP service and interface traffic through IPinIP.

4. Important uses of the invention

The present invention is used to interface between an external agent (FA) and a gateway GPRS support node (GGSN).

Description

The method of interface between foreign agent and GGSN, Gateway GPRS Support Node}

The present invention relates to a method of combining a wireless communication network and a mobile IP of an Internet Engineering Task Force (IETF), and an interface method between an external agent (FA) and a gateway GPRS support node (GGSN) and a computer recording a program for realizing the method. The present invention relates to a recording medium which can be read by.

The conventional wireless communication network and the IETF mobile IP combining method has been studied separately into the wireless network standard and IETF standard.

On the wireless communication network side, the existing mobile communication packet data network and mobile IP are combined in CDMA 2000, which is a synchronous IMT-2000, and W-CDMA, which is an asynchronous IMT-2000. In the synchronous IMT-2000, a packet data service node (PDSN) adopts a method of integrating an external agent (FA) function to build a mobile IP in a network for packet data service. In 2000, the standardization of the structure of combining the mobile IP network with the GPRS network, the existing GSM packet data network, is being standardized.

In this case, what is needed for standardization for combining GPRS network and mobile IP network for mobile IP service in asynchronous IMT-2000 is to accept mobile IP protocol at mobile node, mobile IP service identifier method at packet setup, and gateway GPRS support node ( Service Profile Management in GGSN and the interface between Gateway GPRS Support Node (GGSN) and External Agent (FA). Among these, the interface between the gateway GPRS support node (GGSN) and the external agent (FA) is not yet standardized, and thus standardization is required.

The present invention has been proposed in order to meet the above-mentioned requirements. In order to provide a mobile IP service in a wireless communication network, an external agent (FA) and a gateway GPRS support node independently of a platform are minimized while minimizing modification of existing standards. It is an object of the present invention to provide a method for providing an interface between GGSNs) and a computer-readable recording medium having recorded thereon a program for realizing the method.

1 is a structural diagram of an embodiment of a mobile IP network to which the present invention is applied.

2 is a diagram illustrating an embodiment of a protocol stack between a gateway GPRS support node (GGSN) and an external agent (FA) to which the present invention is applied;

3 illustrates an example of a signaling message format for interfacing between a gateway GPRS support node (GGSN) and an external agent (FA) according to the present invention.

4 is an exemplary diagram illustrating a message state transition for an interface with a gateway GPRS support node (GGSN) in an external agent (FA) in accordance with the present invention.

Figures 5a and 5b is an embodiment flow diagram for an interface method between an external agent (FA) and a gateway GPRS support node (GGSN) in accordance with the present invention.

* Explanation of symbols for the main parts of the drawings

101: mobile node 102: control station (RNC)

103: serving GRPS support node 104: gateway GPRS support node (GGSN)

105: MSC / VLR 106: HLR / AC

107: public telephone network 108: GPRS network 1

109: external agent (FA) 110: diameter server

111: home agent (HA) 112: mobile IP network 1

113: public Internet 114: GPRS network 2

115: Mobile IP network 2 116: opponent node

In the present invention for achieving the above object, in the interface method between the external agent (FA) and the gateway GPRS support node (GGSN), the gateway GPRS support node (hereinafter referred to as "GGSN") and the external agent (hereinafter referred to as "FA"), respectively A first step of separating and operating as an independent node; A second step in which the GGSN and the FA configure a signaling message format to support an IP service and interface a signal using IP / UDP; And a third step in which the GGSN and the FA configure a traffic message format to support the IP service and interface traffic through IPinIP.

The present invention also provides an interface method between an external agent (FA) and a gateway GPRS support node (GGSN), wherein the external agent determines a message type received from the gateway GPRS support node and a message type generated from the FA itself core. A first step of making; A second step of requesting a mobile IP service from the GGSN if the message received from the GGSN is a mobile IP service generation request message; A third step of generating and transferring a mobile IP signal according to a protocol type if a message received from the GGSN is a mobile IP signal transmission message as a result of the determination of the first step; A fourth step of terminating the service if the message received from the GGSN is a mobile IP service termination request message as a result of the determination of the first step; A fifth step of releasing the corresponding mobile IP service resource if the message received from the GGSN is a mobile IP service completion response message; A sixth step of generating and delivering a mobile IP signal by adding an IP header to an agent advertisement message if the message received from the FA core is an agent advertisement signal transmission request message to the GGSN; A seventh step of tunneling with the GGSN of the subscriber where the mobile IP is generated if the message received from the FA core is a mobile IP registration response signal transfer request message; And an eighth step of delivering a mobile IP complete request message to the GGSN if the message received from the FA core is a mobile IP service complete transmission request message.

On the other hand, the present invention, a network management system having a high-capacity processor, a gateway GPRS support node (hereinafter referred to as "GGSN") and the external agent (hereinafter referred to as "FA") each of the first function to operate separately; A second function of the GGSN and the FA configuring a signaling message format to support an IP service and interfacing the signal using IP / UDP; And a computer readable recording medium having recorded thereon a program for realizing a third function of interfacing traffic through IPinIP by configuring a traffic message format for the GGSN and the FA to support an IP service.

In addition, the present invention provides a network management system having a large capacity processor, comprising: a first function of determining, by an external agent, a message type received from a gateway GPRS support node and a message type generated from the FA itself core; A second function for requesting a mobile IP service to the GGSN if the message received from the GGSN is a mobile IP service creation request message as a result of the determination of the first function; A third function of generating and transferring a mobile IP signal according to a protocol type if the message received from the GGSN is a mobile IP signal transmission message as a result of the determination of the first function; A fourth function of terminating a service if a message received from the GGSN is a mobile IP service termination request message as a result of the determination of the first function; A fifth function of releasing the corresponding mobile IP service resource if the message received from the GGSN is a mobile IP service complete response message as a result of the determination of the first function; A sixth function of generating and transmitting a mobile IP signal by adding an IP header to an agent advertisement message if the message received from the FA core is an agent advertisement signal transmission request message to the GGSN; A seventh function that tunnels with the GGSN of the subscriber where the mobile IP is generated if the message received from the FA core is a mobile IP registration response signal transfer request message as a result of the determination of the first function; And if the message received from the FA core is a mobile IP service completion transmission request message, the program for realizing an eighth function for delivering a mobile IP completion request message to the GGSN, may be read by a computer. Provide a recording medium.

The present invention relates to an interface method between an external agent (FA) and a gateway GPRS support node (GGSN) in a wireless communication network. The present invention relates to a gateway GPRS support node (GGSN) and an external agent for providing mobile IP services in an asynchronous IMT-2000. It has generality so that the mobile node can be built on an independent platform or the same platform at the interface with the FA, and the change of the existing GPRS standard and the mobile IP standard can be minimized. In addition, in the present invention, such an interface may be used for transmission of a multicasting packet or a broadcast type packet after initial registration of the mobile IP.

The above objects, features and advantages will become more apparent from the following detailed description taken in conjunction with the accompanying drawings. Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 is a structural diagram of an embodiment of a mobile IP network to which the present invention is applied.

As shown in FIG. 1, the GPRS networks 108 and 114 and the mobile IP networks 112 and 115 are separately shown to support the mobile IP service in the asynchronous IMT-2000.

GPRS networks 108 and 114 are networks accessed by Mobile Nodes (MNs) 101. Mobile nodes 101 are wirelessly connected to control stations (RNCs) 102.

The control station (RNC) 102 may support a circuit telephony service and a packet data service, and in order to support a packet data service, the control station (RNC) 102 is connected to a Serving GPRS Support Node (SGSN) 103. To support the service is connected to the Mobile Switching Service Center / Visitor Location Register (MSC / VLR) (105).

The serving GPRS support node 103 provides the MSC / VLR 105 and the HLR / AC 106 to provide the session management and mobility management functions for the subscribers to support the packet data service of the GPRS subscribers and to find out the information about the subscribers. Interface).

The MSC / VLR 105 is connected to the public telephone network 107 for circuit telephone service. The serving GPRS support node 103 performs a function of an end of a Gateway GPRS Support Node (GGSN) 104 and a GPRS Tunneling Protocol (GTP) of GPRS.

The gateway GPRS support node (GGSN) 104 performs a gateway function of the GPRS networks 108 and 114, interfaces with a public Internet or an Internet service provider, and supports mobile IP services 112 and 115. Coupling with an external agent (FA) 109 of the).

The mobile IP networks 112 and 115 include an external agent (FA) 109, an AAA server (Auhentication Aughorization and Accounting) 110, and a home agent (HA) 111, and an external agent (FA) 109. ) Is coupled to the GPRS networks 108 and 114. All nodes of the mobile IP networks 112 and 115 may transmit control packets and traffic to the public Internet 113. If the mobile IP service is supported in the asynchronous IMT-20000, a GPRS subscriber subscribed to the mobile IP network 2 115 may access the GPRS network 1 108 to receive the service. Subscriber to mobile IP service through GPRS can communicate with counterpart node after mobile IP setup procedure and registration procedure.

FIG. 2 is a structural diagram of a protocol stack between a gateway GPRS support node (GGSN) and an external agent (FA) 109 to which the present invention is applied, and shows a gateway GPRS support node (GGSN) for providing an asynchronous IMT-2000 mobile IP. FIG. Signal protocol stack and traffic stack between the < RTI ID = 0.0 > < / RTI >

In the path from the control station (RNC) 102 to the gateway GPRS support node (GGSN) 104, tunneling of GPRS is performed for packet data service, and the underlying protocol of the GPRS tunneling protocol (GTP) is unity / mobile. IPP (UDP / MIP) is used. The interface between the gateway GPRS support node 104 and the external agent (FA) 109 is used in the GPRS network 108, 114, the Gi + standard 212 made for better support of the mobile IP service. The Gi + standard 212 can support better mobile IP services in GPRS while minimizing the specifications of the gateway GPRS support node (GGSN) 104 and the external agent (FA) 109. It is shown in 3.

The protocol used between the external agent (FA) 109 and the AAA server 110, the AAA server 110 and the home agent (HA) 111 is a diameter protocol 214, and SCTP (Stream) at the lower layer. Control Transmission Protocol (TCP) / Transmission Control Protocol (TCP) 215 is used.

The diameter protocol 214 supports mobile IP as a protocol for authentication, authorization, and charging in the Internet.

Traffic in the GPRS is transmitted through the GTP-U 221 to the gateway GPRS support node (GGSN), and the gateway GPRS support node (GGSN) reads that the relevant traffic is that of the mobile IP service user, and thus the external agent (FA) ( Encapsulated in IPinIP 222 and transmitted.

The IPinIP 222 is used for the purpose of creating another mobile IP header on the mobile IP so that the corresponding packet is necessarily transmitted to a specific node. In an external agent (FA) 109, whether or not reverse tunneling is used by the associated packet user Accordingly, the encapsulated packet is tunneled back to the home agent HA to transmit a related packet, or only the encapsulated mobile IP is removed to route the mobile IP. According to the use of the IPinIP tunnel between the gateway GPRS support node (GGSN) and the external agent (FA), the reverse tunneling function in the external agent (FA) 109 can be easily provided, and the external agent (FA) 109 It can have the advantage of easy charging data collection.

3 is an exemplary diagram of a signal message format for an interface between a gateway GPRS support node (GGSN) and an external agent (FA) according to the present invention.

The signaling message between the gateway GPRS support node (GGSN) 104 and the external agent (FA) 109 includes a signal identifier 301, a message length 302, a GTP identifier 303, and user data 304.

The signal identifier is used to identify a message used between the gateway GPRS support node (GGSN) 104 and the external agent (FA) 109, and the gateway GPRS support node (GGSN) 104 and the external agent ( The message used between FA) 109 is as follows.

If the signal identifier is "0x01", the mobile IP service creation request message is transmitted; if "0x02", the mobile IP signaling message is transmitted; if it is "0x03", the mobile IP service creation response message is sent; The end response message indicates a mobile IP service termination response message in case of "0x05", a mobile IP service completion request message in case of "0x06", and a mobile IP service completion response message in case of "0x07".

The mobile IP service creation request message is used to inform the external agent (FA) 109 from the gateway GPRS support node (GGSN) 104 when the subscriber who subscribes to the mobile IP service makes a mobile IP service request. .

The mobile IP signaling message is an initial mobile IP signaling message that is used after the subscriber is assigned a mobile IP address after access.

The mobile IP service generation response message gives a mobile IP to a corresponding subscriber when initial mobile IP registration is successful, and informs the gateway GPRS support node (GGSN) 104 including a failure reason when the initial mobile IP registration fails. Message.

The mobile IP termination request message is a message generated at the gateway GPRS support node (GGSN) 104 by the mobile IP service termination request of the mobile station.

The mobile IP end response message is a message generated after the mobile IP service end processing by the external agent (FA) 109.

The mobile IP service completion request message is a message generated by the mobile IP network to transmit mobile IP service completion by an external agent (FA) 109 to the gateway GPRS support node (GGSN) 104. The response message is the mobile IP service completion response message.

The message length 302 is the length of the message plus the length of the mobile IP signal.

As the GTP identifier 303, the GTP identifier uses a GTP identifier transmitted by the gateway GPRS support node (GGSN) 104 at the start of mobile IP service generation.

The user data 304 includes an IP header in a mobile IP signal generated by an external agent (FA) 109.

The following shows an example of a mobile IP signaling message among the messages used between the gateway GPRS support node (GGSN) 104 and the external agent (FA) 109.

The value of the signal identifier is "0x02" defined and the message length is the length of 4 plus mobile IP signal which is the length of the GTP identifier.

The user data includes the mobile IP header in the mobile IP signal generated by the external agent (FA) 109. In the case of the agent advertisement message or the agent advertisement request message, the user data is generated by creating a message including the mobile IP header and the ICMP header. In the case of a mobile IP registration request and a mobile IP registration response message, user data is created by creating a mobile IP header and a UDP header.

In the mobile IP signaling message configured as described above, only user data is transmitted to the mobile node through the corresponding GTP identifier by the gateway GPRS support node (GGSN) 104. This enables the gateway GPRS support node (GGSN) 104 to transmit only the IP signal without distinction and operate independently of the function of the mobile IP node.

4 is a diagram illustrating a message state transition for an interface with a gateway GPRS support node (GGSN) in an external agent (FA) according to the present invention, and a gateway GPRS support node (GGSN) in an asynchronous IMT-2000 external agent (FA). This is a state diagram for processing interface messages with).

The state diagram for signal processing from the external agent (FA) 109 to the gateway GPRS support node (GGSN) 104 is as follows, idle (401), idle IP signal waiting (402), mobile The process is divided into the IP activation 403 and the mobile IP completion response waiting state 404, and the state diagram is applied to each subscriber who wants to receive the mobile IP service.

First, when a mobile IP service generation request message is received in an idle state (Idle) 401, the mobile IP service generation request message is stored in a table and then transitions to the mobile IP signal waiting state 402.

When the mobile IP signal is received from the gateway GPRS support node (GGSN) 104 in the mobile IP signal waiting state 402, the mobile IP header and the UDP or ICMP header are removed from the user data, and the mobile IP signal is processed. When receiving the mobile IP signal transmission request from the inside, the mobile IP signal is overlaid with an IP header or a UDP header and a related GTP identifier is inserted to create a mobile IP signaling message and transmitted to the gateway GPRS support node (GGSN) 104. .

In addition, since the mobile IP signaling message events are all transitioned to the mobile IP signal waiting state. If the mobile IP registration response transmission request message is received in the mobile IP signal waiting state 402, the mobile IP service generation response message is transmitted to the gateway GPRS support node (GGSN) 104 and then transitions to the mobile IP activation state 403. .

In the mobile IP activation state 403, traffic packets of the mobile IP service subscriber are transmitted and received through IPinIP. In the mobile IP activation state 403, when a mobile IP completion request message is received from a mobile IP network node, that is, an AAA server or HA, a mobile IP completion request message is transmitted to a gateway GPRS support node (GGSN) 104. The mobile IP completion response transitions to the waiting state. In addition, when the mobile IP end request message is received from the gateway GPRS support node (GGSN) 104 in the mobile IP activation state, the mobile IP end processing and the mobile IP end response message are transmitted to the gateway GPRS support node (GGSN) 104. After that, the management table is initialized to transition to an idle state (Idle) 401.

In the mobile IP complete response wait state 404, upon receiving the mobile IP complete response message from the gateway GPRS support node (GGSN) 104, the associated table is initialized, the routing information is cleared, and the state transitions to the idle state 401.

5A and 5B are flowcharts illustrating an interface method between an external agent (FA) and a gateway GPRS support node (GGSN) according to the present invention, and the gateway GPRS support node (GGSN) in an asynchronous IMT-2000 external agent (FA). The interface processing procedure with) is shown.

After starting, the initial state is idle (501). In this state, a message can always be received from a gateway GPRS support node (GGSN) (503), and a message can also be received from an external agent (FA) core (504). First, it is determined whether the message is received from a gateway GPRS support node (GGSN) or a message received from an external agent (FA) core (502).

In the determination result 502, if the message is received (503) from the gateway GPRS support node (GGSN), the identifier 20 of the corresponding message is analyzed (505) to determine whether the message type is a mobile IP service creation request message or a mobile IP signal. Check whether the transfer message, the mobile IP service termination request message, or the mobile IP service completion response message (506, 507, 508, 509).

When the mobile IP service generation request message is received (506), the mobile IP signal is stored in the mobile IP subscriber entry (510), and the mobile IP signal for generating an agent advertisement message and transmitting it to the gateway GPRS support node (GGSN). Generate (511). The generated mobile IP signal message is transmitted to the gateway GPRS support node (GGSN) including the relevant information (512). The message is then received from the gateway GPRS support node (GGSN) (503).

If the message received from the gateway GPRS support node (GGSN) is a mobile IP signaling message (507), if the message for the subscriber's GTP identifier is found in the GPRS subscriber management table and the current state of the relevant entry is the mobile IP signal waiting state, This is processed in the next step, or the message is discarded (514). The IP header of the received mobile IP signaling message is decoded (515) to analyze the protocol type (516), and if the analyzed protocol type is ICMP (517) or UDP (518), it is processed, or otherwise discarded. If the IP protocol type is ICMP (517), only the agent advertisement request message is processed (519). In the case of the agent advertisement request message, an agent advertisement message is generated and a related message is generated to be transmitted again through the mobile IP signaling message (521). The mobile IP signaling message including the agent advertisement message is transmitted to the gateway GPRS support node (GGSN) (522) and moved to the message reception state (502). If the protocol type included in the mobile IP header is UDP (518), it is checked whether the message is a mobile IP registration request message, and as a result of the check, only the mobile IP registration request (520) processes the related message (523). Transition to the reception state (503).

If the message received from the gateway GPRS support node (GGSN) is a mobile IP service termination request message (508), after performing termination processing for the mobile IP service (524), after deleting the mobile IP subscriber entry (525), The mobile IP service termination response message is transmitted to the gateway GPRS support node (GGSN) (526). After the mobile IP service termination response message is transmitted, tunnel information established between the gateway GPRS support node GGSN and the external agent FA is released (527), and the current state is transitioned to the idle state (528).

If the message received from the gateway GPRS support node (GGSN) is a mobile IP service complete response message (509), the mobile IP subscriber entry is deleted (529), and between the gateway GPRS support node (GGSN) and the external agent (FA). After releasing the tunneling information (527), the state transitions to the idle state (528).

When an event from the external agent (FA) core occurs and a message is received (504), whether it is an agent advertisement delivery request message (530), whether it is a mobile IP registration response signaling request message (531), or whether the mobile IP service completion transmission request message Check (532).

Upon receipt of the agent advertisement signaling request message (530), the associated subscriber is found in the management table (533). If the current state is the mobile IP signal waiting state (534), the related message is processed, or the message waiting process (502). Proceed to If the status is a mobile IP signal waiting state, a mobile IP delivery signal is generated by adding an IP header to an agent advertisement message (535), and the mobile IP signaling message is transmitted to a gateway GPRS support node (GGSN) by obtaining relevant information from a table. (536), and returns to the reception waiting process (503).

When a mobile IP registration response signaling message request message from an external agent (FA) core is generated (531), an entry of a related mobile subscriber is found in a management table and data (537) related to the subscriber is retrieved. If the status information of the message-related table entry is in the mobile IP signal waiting state (538), a UDP / IP header is attached to the mobile IP registration response signal to make the mobile IP signaling message (539) and transmitted to the gateway GPRS support node (540). After changing the state to the mobile IP activation state (541), the mobile IP generation response message is sent to the gateway GPRS support node (GGSN) by inserting the GTP ID and the mobile IP address of the mobile IP subscriber (542), and the gateway GPRS support node. The traffic between the (GGSN) and the external agent (FA) is added to the routing table so as to pass through the tunnel (543), and then proceeds to the waiting process (503).

When the mobile IP service completion transmission request event from the external agent (FA) occurs (532), and transfers the mobile IP service completion request message to the gateway GPRS support node (GGSN) (544), and transitions to the mobile IP completion response waiting state (545). ).

The method of the present invention as described above may be implemented as a program and stored in a computer-readable recording medium (CD-ROM, RAM, ROM, floppy disk, hard disk, magneto-optical disk, etc.).

The present invention described above is not limited to the above-described embodiment and the accompanying drawings, and it is common in the art that various substitutions, modifications, and changes can be made without departing from the technical spirit of the present invention. Will be evident to those who have knowledge of

As described above, the present invention can minimize the specification of mobile IP nodes while minimizing the change of GPRS specification on the gateway GPRS support node (GGSN) side when providing a mobile IP service in asynchronous IMT-2000. It is common to use existing communication techniques, and it is effective to construct an interface between a gateway GPRS support node (GGSN) and an external agent (FA) consistently and independently of the platform.

In addition, the present invention has an effect that can be used not only when the mobile node is not assigned a mobile IP address at the time of initial registration of the mobile IP service, but also used for transmission of multicasting packets and broadcast packets.

Claims (12)

In the interface method between the external agent (FA) and the gateway GPRS support node (GGSN), A first step in which the gateway GPRS support node (hereinafter referred to as "GGSN") and the external agent (hereinafter referred to as "FA") are respectively separated into independent nodes; A second step in which the GGSN and the FA configure a signaling message format to support an IP service and interface a signal using IP / UDP; And A third step in which the GGSN and the FA configure traffic message formats to support IP services and interface traffic through IPinIP; Interface method between the external agent (FA) and the gateway GPRS support node (GGSN) comprising a. In the interface method between the external agent (FA) and the gateway GPRS support node (GGSN), A first step of determining, by an external agent, a message type received from a gateway GPRS support node and a message type generated from the FA itself core; A second step of requesting a mobile IP service from the GGSN if the message received from the GGSN is a mobile IP service creation request message; A third step of generating and transferring a mobile IP signal according to a protocol type if a message received from the GGSN is a mobile IP signal transmission message as a result of the determination of the first step; A fourth step of terminating the service if the message received from the GGSN is a mobile IP service termination request message as a result of the determination of the first step; A fifth step of releasing the corresponding mobile IP service resource if the message received from the GGSN is a mobile IP service completion response message; A sixth step of generating and delivering a mobile IP signal by adding an IP header to an agent advertisement message if the message received from the FA core is an agent advertisement signal transmission request message to the GGSN; A seventh step of tunneling with the GGSN of the subscriber where the mobile IP is generated if the message received from the FA core is a mobile IP registration response signal transfer request message; And An eighth step of transmitting a mobile IP complete request message to the GGSN if the message received from the FA core is a mobile IP service complete transfer request message; Interface method between the external agent (FA) and the gateway GPRS support node (GGSN) comprising a. The method according to claim 1 or 2, The format of the message is A signal identifier field for identifying a message used for the GGSN and the FA, a message length field indicating a message length used for the GGSN and the FA, and a GTP indicating a GTP identifier transmitted by the GGSN at the start of mobile IP service creation And an identifier field, and a user data field added by adding an IP header to the mobile IP signal generated by the FA. The method of claim 2, The second step, A ninth step of receiving a mobile IP service creation request message and storing mobile IP subscriber related information; A tenth step of generating an agent advertisement message after storing the subscriber related information; And An eleventh step of generating the agent advertisement message as a mobile IP signal and transmitting it to the GGSN, and waiting for the mobile IP signal; Interface method between the external agent (FA) and the gateway GPRS support node (GGSN) comprising a. The method of claim 2, The third step, A ninth step of receiving a mobile IP signaling message and analyzing a protocol type by analyzing a mobile IP header when a current state of a mobile IP subscriber entry is a mobile IP signal waiting state; A tenth step of processing only an agent advertisement request message when the protocol type is ICMP; And An eleventh step of processing the received mobile IP registration request message when the protocol type is UDP; Interface method between the external agent (FA) and the gateway GPRS support node (GGSN) comprising a. The method of claim 2, The fourth step, A ninth step of receiving a mobile IP service termination request message, performing a termination process for the mobile IP service, and deleting a mobile IP subscriber entry receiving the mobile IP service; A tenth step of releasing tunnel information established between the GGSN and the FA after transmitting the mobile IP service termination response message to the GGSN; And Eleventh step of transitioning the current state to the idle state so that new data can be received Interface method between the external agent (FA) and the gateway GPRS support node (GGSN) comprising a. The method of claim 2, The fifth step, A ninth step of receiving a mobile IP service completion response message and deleting the mobile IP subscriber entry; And A tenth step of transitioning the current state to an idle state after releasing tunneling information between the GGSN and the FA Interface method between the external agent (FA) and the gateway GPRS support node (GGSN) comprising a. The method of claim 2 The sixth step, A ninth step of receiving an agent advertisement signaling request message from an external agent internal core and finding a related subscriber in a management table; A tenth step of processing a related message if the current state is a waiting state of a mobile IP signal or otherwise receiving a reception state; An eleventh step of adding a IP header to the agent advertisement message to generate a mobile IP transmission signal if the status is a mobile IP signal waiting state; And A twelfth step of obtaining the relevant information from the management table, transmitting a mobile IP signaling message to the GGSN, and returning to a reception standby state; Interface method between the external agent (FA) and the gateway GPRS support node (GGSN) comprising a. The method of claim 2 The seventh step, Receiving a mobile IP registration response signaling request message from an external agent internal core, finding a related subscriber's entry in a management table, and fetching data related to the subscriber; A tenth step of determining whether the state information of the message-related table entry is in the waiting state of the mobile IP signal; An eleventh step of attaching a UDP / IP header to a mobile IP registration response signal if the mobile IP signal is in a waiting state; A twelfth step of making a mobile IP signaling message and transmitting it to the GGSN, changing the state to a mobile IP activation state, and then sending a GTP ID and a mobile IP address of the mobile IP subscriber to the GGSN in a mobile IP generation response message; And A thirteenth step of adding traffic to the routing table to allow traffic between the GGSN and the FA to pass through the tunnel; Interface method between the external agent (FA) and the gateway GPRS support node (GGSN) comprising a. The method of claim 2 The eighth step, A ninth step of receiving a mobile IP service complete transmission request message from an external agent internal core and transferring a mobile IP service complete request message to the GGSN when a mobile IP service complete transmission request event from the FA occurs; And A tenth step of transitioning to a mobile IP complete response waiting state after transmitting the mobile IP service complete request message; Interface method between the external agent (FA) and the gateway GPRS support node (GGSN) comprising a. In a network management system with a large processor, A first function in which the gateway GPRS support node (hereinafter referred to as "GGSN") and the external agent (hereinafter referred to as "FA") are operated as separate nodes; A second function of the GGSN and the FA configuring a signaling message format to support an IP service and interfacing the signal using IP / UDP; And A third function in which the GGSN and the FA configure traffic message formats to support IP services and interface traffic through IPinIP; A computer-readable recording medium having recorded thereon a program for realizing this. In a network management system with a large processor, A first function of determining, by an external agent, a message type received from a gateway GPRS support node and a message type generated from the FA itself core; A second function for requesting a mobile IP service to the GGSN if the message received from the GGSN is a mobile IP service creation request message as a result of the determination of the first function; A third function of generating and transferring a mobile IP signal according to a protocol type if the message received from the GGSN is a mobile IP signal transmission message as a result of the determination of the first function; A fourth function of terminating a service if a message received from the GGSN is a mobile IP service termination request message as a result of the determination of the first function; A fifth function of releasing the corresponding mobile IP service resource if the message received from the GGSN is a mobile IP service complete response message as a result of the determination of the first function; A sixth function of generating and transmitting a mobile IP signal by adding an IP header to an agent advertisement message if the message received from the FA core is an agent advertisement signal transmission request message to the GGSN; A seventh function that tunnels with the GGSN of the subscriber where the mobile IP is generated if the message received from the FA core is a mobile IP registration response signal transfer request message as a result of the determination of the first function; And An eighth function for delivering a mobile IP complete request message to the GGSN if the message received from the FA core is a mobile IP service complete transfer request message as a result of the determination of the first function; A computer-readable recording medium having recorded thereon a program for realizing this.