KR101064651B1 - Method and System for optimization of communication path between mobile terminals in the proxy mobile IPv6 network - Google Patents

Abstract

A method and system for establishing an optimal path between LMAs when a mobile terminal moves to different domain areas on a proxy mobile IPv6-based network are disclosed. According to the disclosed method and system, the LMA of the domain region to which the mobile terminal after the movement belongs performs a binding update with the LMA of the domain region to which the counterpart terminal communicating with the mobile terminal forms a tunnel between both LMAs, thereby establishing a tunnel between the mobile terminal and the counterpart terminal. Communicate directly through this tunnel. Therefore, communication is possible through direct tunneling between the LMAs of the mobile station and the other party's domain without going through the LMA of the first or previous domain, thereby improving packet forwarding performance between the mobile station and the other party. You can also eliminate unnecessary network resources.

Proxy Mobile IPv6, Local Mobility Anchor (LMA), Mobile Access Gateway (MAG), Proxy Binding Update (PBU), Proxy Binding Acknowledgement (PBA), Home Network Prefix (HNP), Binding Cache Entry (BCE)

Description

Method and system for optimization of communication path between mobile terminals in the proxy mobile IPv6 network

The present invention relates to a method and system for optimizing a communication path between mobile terminals in a proxy mobile IPv6-based network, and more particularly, to set an optimal path between LMAs when a mobile terminal moves to different domains in a proxy mobile IPv6-based network. The present invention relates to a method and system for optimizing a communication path between mobile terminals in a proxy mobile IPv6-based network.

Recently, with the proliferation of wireless terminals and the ubiquitous era, various Internet application services that have been provided through wired terminals should now be equally provided through wireless mobile terminals. Accordingly, since the early 2000s, standardization of IP-based mobility support protocols has been in progress, focusing on The Internet Engineering Task Force (IETF).

For example, in order to provide Internet services to various types of personal wireless terminals such as laptops, netbooks, PDAs, PMPs, and mobile phones, it is necessary to establish an IPv6-based Internet and assign IP addresses to individual wireless terminals. To do this, it is developed from IPv4, which has a limit of the number of addresses, and is moving toward IPv6.

Mobile IPv6 (MIPv6) has been standardized to provide uninterrupted Internet application services to mobile devices based on IPv6. Based on this, Fast Handovers for Mobile IPv6 (FMIPv6) and Hierarchical Mobile IPv6 (HMIPv6) have been developed to reduce handover latency. Mobility Management is further standardized.

All of these methods require the MIPv6 related protocol to be added to the mobile terminal, and when the terminal moves to another network (Foreign Network), the mobile terminal detects the new IP address (CoA :). Mobile terminal-based mobility management by informing the home agent (HA) of the home network (HA) of the home network where the care-of address is originally located so that packets coming to the user can be received even at the current location. I'm using the method. However, this method imposes a large part of the burden on mobility management to the mobile terminal, and in a small terminal such as a mobile phone, the provision of such a protocol causes a problem that the mobility providing service cannot be activated.

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and an object of the present invention is to provide a method for setting an optimal path between LMAs when a mobile station moves to different domains on a proxy mobile IPv6-based network.

Another object of the present invention is to provide a system for performing the method.

In order to achieve the above object of the present invention, a method according to embodiments of the present invention includes a first mobile terminal and a second mobile terminal managed by a first local mobility manager (LMA) of a first domain region on a proxy mobile IPv6-based network. The first mobile terminal moves from the first domain region to the third domain region while the second mobile terminals managed by the second LMA in the domain region communicate with each other to set an optimal path between the LMAs. According to the disclosed method, a third LMA in the third domain region performs binding update to the first LMA to send the first mobile terminal related traffic received by the first LMA to the third LMA. And handover between the third domain and the third domain. And the third LMA performs a binding update to the second LMA to form a tunnel between the third LMA and the second LMA. Accordingly, the first mobile terminal communicates directly with the second mobile terminal through the tunnel.

In embodiments of the present invention, in order to perform the handover, a third MAG detects a connection of the first mobile terminal moved to the third domain area, and the third MAG detects the connection via the PBU message. The ID of the first mobile terminal is transmitted to the third LMA to request the binding update from the third LMA. When the third LMA obtains the address of the first LMA through a database storing the information of the first mobile terminal, the third LMA requests a binding update to the first LMA of the secured address. When the first LMA delivers the HNP of the first mobile terminal through a PBA message and modifies the binding information associated with the first mobile terminal stored in the first BCE, the third LMA that receives the PBA message receives the second LMA. A BCE is generated to form a tunnel with the first LMA.

In embodiments of the present invention, after the third LMA performs a handover with the first LMA, the third LMA registers information in the database that the first mobile terminal is located in the third domain area. Do more with the process.

In an embodiment of the present invention, in order to form a tunnel between the third LMA and the second LMA, the second LMA address in which the third LMA manages the second mobile terminal from a global database (Global DB) And the third LMA transmits a path optimization PBU message including the HNP of the first mobile terminal to the second LMA. At this time, the second LMA stores the HNP and the third LMA of the first mobile terminal received through the path optimization PBU message in its BCE, and transmits a path optimization PBA message to the third LMA. Accordingly, the third LMA receiving the PBA message updates its BCE and forms a tunnel with the second LMA.

Here, when the third LMA obtains the address of the second mobile terminal from the packet transmitted between the first mobile terminal and the second mobile terminal in order to obtain the second LMA address, The third LMA requests the global database to authenticate the address of the second mobile terminal. Accordingly, the third database may obtain the second LMA address by authenticating and responding to the third LMA including the second LMA address of the second domain area.

In embodiments of the present invention, the optimization PBU message is set to O flag in a specific bit so that the PBU message is recognized as the optimization PBU message, and includes the HNP of the first mobile terminal. In addition, in the optimized PBA message, an O flag is set to a specific bit so that the PBA message is recognized as an optimized PBA message, and does not include the HNP of the first mobile terminal.

In order to achieve the above object of the present invention, a system according to embodiments of the present invention includes a first mobile terminal and a second mobile terminal managed by a first LMA (Local Mobility Anchor) in a first domain area on a proxy mobile IPv6-based network. The first mobile terminal moves from the first domain region to the third domain region while the second mobile terminals managed by the second LMA in the domain region communicate with each other to set an optimal path between the LMAs. Accordingly, the system of the present invention comprises a second LMA managing the second mobile terminal and a third LMA managing the moved first mobile terminal. At this time, the third LMA performs a handover with the first LMA to form a first tunnel with the first LMA, and establishes the second mobile terminal and the second LMA address through the first tunnel and the global database. After the acquisition, binding update is performed with the second LMA to form a second tunnel with the second LMA. Accordingly, the first mobile terminal can directly communicate with the second mobile terminal through the second tunnel.

In embodiments of the present invention, the third LMA detects a connection of the first mobile terminal that has moved to the third domain area and recognizes the ID of the first mobile terminal through a Proxy Binding Update (PBU) message. A MAG (Mobile Access Gateway) for transmitting to the third LMA.

In embodiments of the present invention, the third LMA obtains the address of the first LMA using the ID of the first mobile terminal received from the MAG, requests the binding update to the first LMA, and A tunnel may be formed with the first LMA. In addition, the third LMA obtains the address of the second mobile terminal from the packet transmitted between the first mobile terminal and the second mobile terminal, and the authentication procedure with the global database using the address of the second mobile terminal.

According to the method and system for optimizing a communication path between mobile terminals in a proxy mobile IPv6-based network according to the present invention as described above has the following advantages.

First, even when the mobile terminal moves between domains, the LMA of the new domain region can easily form a tunnel that enables direct communication between the LMAs through a binding update process with the LMA of the other terminal.

Second, by directly communicating with the mobile terminal and the counterpart terminal through a tunnel formed between the LMAs, it is possible to increase the packet transfer performance between the mobile terminal and the counterpart terminal.

Third, the mobile terminal and the counterpart terminal communicate with each other through LMAs in the domain region to which the mobile station currently belongs, so that the mobile terminal does not need to communicate via the LMA belonging to the first or previous one, thereby reducing unnecessary use of network resources.

A method and system for optimizing a communication path between mobile terminals in a proxy mobile IPv6-based network according to embodiments of the present invention will be described in detail with reference to the accompanying drawings. As the inventive concept allows for various changes and numerous modifications, particular embodiments will be illustrated in the drawings and described in detail in the text. However, this is not intended to limit the present invention to a specific disclosed form, it should be understood to include all modifications, equivalents, and substitutes included in the spirit and scope of the present invention. Like reference numerals are used for like elements in describing each drawing. In the accompanying drawings, the dimensions of the structure is shown to be larger than the actual size for clarity of the invention, or to reduce the actual size to understand the schematic configuration.

In addition, terms such as first and second may be used to describe various components, but the components should not be limited by the terms. The terms are used only for the purpose of distinguishing one component from another. For example, without departing from the scope of the present invention, the first component may be referred to as the second component, and similarly, the second component may also be referred to as the first component. On the other hand, unless otherwise defined, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art. Terms such as those defined in the commonly used dictionaries should be construed as having meanings consistent with the meanings in the context of the related art and shall not be construed in ideal or excessively formal meanings unless expressly defined in this application. Do not.

2 is a block diagram illustrating a system for optimizing a communication path between mobile terminals in a proxy mobile IPv6 based network according to embodiments of the present invention.

2, a system according to an embodiment of the present invention provides a method for optimizing communication efficiency and data transmission while a first mobile terminal 100 and a second mobile terminal 200 are moved on a proxy mobile IPv6-based network. will be. In particular, the system is managed by the first mobile terminal 100 managed by the first Local Mobility Anchor (LMA) 310 of the first domain region 300 and the second LMA 410 of the second domain region 400. When the first mobile terminal 100 moves from the first domain region 300 to the third domain region 500 while the second mobile terminal 200 communicates with each other, an optimal path between the LMAs is set.

Meanwhile, referring to FIG. 1, in the conventional system, when the first mobile terminal 10 moves to another domain region, the first mobile terminal 10 may move to a new domain region in order to communicate with the second mobile terminal 20. The second LMA 40 forms a tunnel 60 with the first LMA 30 that previously managed the first mobile terminal 10. In addition, the second LMA 40 may receive data and messages from the second mobile terminal 20 only through the first LMA 30. Therefore, regardless of the distance between the first mobile terminal 10 and the first LMA 30, all packets must continuously pass through the first LMA 30, thereby increasing unnecessary load on the entire network and improving packet forwarding performance. It can cause fatal problems.

Referring back to FIG. 2, a system according to embodiments of the present invention includes a second LMA 410 and a third LMA 510 to optimize a path between LMAs as a movement between domains of a mobile terminal occurs.

In the embodiment of the present invention, the second LMA 410 manages the second mobile terminal 200 of the second domain area 400, and the third LMA 510 is configured to be the first in the first domain area 300. The first mobile terminal 100 moved to the three domain areas 500 is managed.

Meanwhile, the third LMA 510 is disposed between the first mobile terminal 100 and the third LMA 510 and has a signaling procedure related to mobility support with the third LMA 510 on behalf of the first mobile terminal 100. It includes a third MAG (Mobile Access Gateway, 520) that is an access router that performs the.

The third LMA 510 performs a handover with the first LMA 310 of the domain region to which the first mobile terminal 100 has first accessed or previously accessed, and thus the first LMA 510 communicates with the first LMA 310. The tunnel 600 is formed.

In detail, the third MAG 520 may detect the connection of the first mobile terminal 100 that has moved to the third domain area 500 and obtain an ID of the first mobile terminal 100. The third MAG 520 transmits the ID of the first mobile terminal 100 to the third LMA 510 through a PBU (Proxy Binding Update) message. The third LMA 510 obtains the address of the first LMA 310 using the ID of the first mobile terminal 100 received from the third MAG 520, and updates the binding to the first LMA 310. request. Accordingly, the third LMA 510 may form a tunnel for communicating with the first LMA 310.

The third LMA 510 obtains the address of the second mobile terminal 200 and the address of the second LMA 410 through the first tunnel 600 and the global database (not shown).

Specifically, the third LMA 510 obtains the address of the second mobile terminal 200 from the packet transmitted through the first tunnel 600 between the first mobile terminal 100 and the second mobile terminal 200. In addition, an address of the second LMA 410 may be obtained through an authentication procedure with a global database (not shown) using the address of the second mobile terminal 200.

In an embodiment of the present invention, after the third LMA 510 obtains the addresses of the second mobile terminal 200 and the second LMA 410, the third LMA 510 is transferred to the second LMA 410. The binding update is performed to form the second LMA 410 and the second tunnel 700. Therefore, the first mobile terminal 100 can directly communicate with the second mobile terminal 200 through the second tunnel 700.

As such, when the mobile terminal moves to another domain region, the LMA of the domain region to which the mobile terminal currently belongs forms a tunnel with the LMA managing the counterpart terminal, so that the mobile terminal can directly communicate with the counterpart terminal. As a result, the packet transfer performance between the mobile terminal and the counterpart terminal can be improved, and unnecessary use of network resources can be eliminated.

Hereinafter, a method for optimizing communication efficiency and data transmission for a mobile terminal leaving a legacy domain in a proxy mobile IPv6-based network according to embodiments of the present invention will be described.

3 is a flowchart illustrating a hand-over process of a method for optimizing a communication path between mobile terminals in a proxy mobile IPv6 based network according to embodiments of the present invention.

Although not shown, the first mobile terminal sets its IPv6 address before performing the handover. Specifically, the first MAG in the first domain region receives a router solicitation (RS) message from the first mobile terminal and obtains an ID of the first mobile terminal from the RS message. The first MAG transmits an ID of the first mobile terminal to the first LMA by using a proxy binding update (PBU) message. Subsequently, the first LMA transmits a Home Network Prefix (HNP) to the first MAG to be allocated to the first mobile terminal using a Proxy Binding Acknowledgement (PBA) message, and communicates with the binding cache entry (BCE) and the first MAG. Create a tunnel. The first MAG receives the PBA message and transmits the HNP of the first mobile terminal to the first mobile terminal using a Router Advertisement (RA) message. Accordingly, it sets its IPv6 address based on the HNP of the first mobile terminal received by the first mobile terminal.

In embodiments of the present invention, the first mobile terminal is managed while the first mobile terminal managed by the first LMA in the first domain region and the second mobile terminal managed by the second LMA in the second domain region communicate with each other. When moving from the first domain region to the third domain region, the third LMA in the third domain region performs binding update to the first LMA to transfer traffic related to the first mobile terminal received by the first LMA to the third LMA. A handover between the sending first domain and the third domain is performed.

Specifically, referring to FIG. 3, the first mobile terminal moving from the first domain area to the third domain area accesses the network (S300).

The third MAG detects the access of the first mobile terminal moved to the third domain area (S305). At this time, the third MAG may obtain the ID of the first mobile terminal.

The third MAG that detects the movement (access) of the first mobile terminal transmits an ID of the first mobile terminal to the third LMA through a PBU message and requests a binding update from the third LMA (S310).

The third LMA may obtain the address of the first LMA through a database that stores information of the first mobile terminal.

In detail, the third LMA receiving the binding update request from the third MAG recognizes that the ID of the first mobile terminal is in the form of @home, and transmits an authentication request message to the database DB (S315).

The database receiving the authentication request message transmits an authentication response message to the third LMA. At this time, the database recognizes that the first mobile terminal has moved in the first domain area and transmits the first LMA address included in the authentication response message (S320).

The third LMA that secures the address of the first LMA requests a binding update to the first LMA (S325).

The first LMA receiving the binding update request accepts the binding update, checks the HNP of the first mobile terminal, and modifies the binding information related to the first mobile terminal stored in the BCE (S330).

In addition, the first LMA transfers the HNP of the first mobile terminal to the third LMA through the PBA message (S335).

Subsequently, the third LMA receives the PBA message from the first LMA, and the third LMA generates a BCE to form a tunnel with the first LMA (S340).

Through the above processes, the third LMA forms a tunnel with the first LMA, so that handover between the first domain and the third domain may be performed.

On the other hand, the third LMA transmits the PBA message to the third MAG in response to the PBU message from the third MAG (S345). Here, the third LMA informs the third MAG of the HNP of the first mobile terminal through a PBA message.

The third MAG may accept the PBA message and generate a BCE to form a tunnel for communication with the third LMA (S350).

Thereafter, when the third MAG receives the RS message from the first mobile terminal (S360), the third MAG notifies the HNP of the first mobile terminal to the first mobile terminal in response to the RA message (S365).

As such, the first mobile terminal receives the same prefix as the prefix it has previously through the RA message, so that the address of the first mobile terminal remains unchanged and the service operated so far maintains its continuity. Can be.

Meanwhile, in the embodiments of the present invention, after the third LMA establishes a tunnel for communication with the first LMA, the third LMA registers information in the database that the first mobile terminal is located in the third domain area (S355). This may be an optimization process to be performed later, that is, a preliminary process required for the third LMA to form a tunnel with the second LMA.

4 is a flowchart illustrating a path optimization process between LMAs in a method according to embodiments of the present invention. 5 and 6 are diagrams for explaining types of optimization messages transmitted between LMAs.

Referring to FIG. 4, after the third LMA maintains service continuity between the first mobile terminal and the second mobile terminal through a handover procedure between the first domain and the third domain, path optimization may be performed to improve data transfer performance. Determine whether it is necessary (S400). Accordingly, when it is determined that communication path optimization between the first mobile terminal and the second mobile terminal is necessary, the subsequent procedure is performed.

Firstly, the third LMA obtains the address of the second LMA managing the second mobile terminal from the global database. Here, the global database may be the same as the database of FIG. 3, or alternatively, the global database may be a main database that stores information of the entire system as a whole.

On the other hand, the third LMA may obtain the address of the second LMA using the address of the second mobile terminal. Although not shown, the third LMA may perform the following process to obtain the address of the second mobile terminal. Specifically, all packets transmitted between the first mobile terminal and the second mobile terminal are delivered to the third LMA in an encapsulated state, and the third LMA decapsulates these packets and checks the BCE based on the destination address and then again. Encapsulate it and deliver it. During this process, the third LMA may know the address of the second mobile terminal.

Subsequently, in order to obtain the address of the second LMA, the third LMA transmits an authentication request message to the global database together with the address of the second mobile terminal (S405).

The global database receiving the authentication request message transmits the authentication response message to the third LMA and informs the third LMA of the address of the second LMA of the second domain to which the second mobile terminal belongs (S410).

The third LMA having obtained the address of the second LMA transmits a path optimization PMU message to the second LMA (S415).

Referring to FIG. 5, the O flag may be set to a specific bit so that the optimized PBU message is recognized as a PBU message for the optimization path, and the optimized PBU message includes the HNP of the first mobile terminal. This means that if the O flag is not set for a particular bit of the optimization PBU message, then the second LMA sends a PBA message containing its prefix as a response message, which is not the first NHP of the first mobile terminal. This is because continuity of service cannot be maintained by receiving HNP.

Upon receiving the optimization PBU message from the third LMA, the second LMA accepts the PBU message and generates a BCE (S420). In addition, the second LMA transmits the optimization PBA message to the third LMA in response to the optimization PBU message (S425).

Referring to FIG. 6, in the optimized PBA message, an O flag may be set to a specific bit like the optimized PBU message. However, the HNP of the first mobile terminal is not included in the optimized PBA message. This is because the second LMA does not need to allocate a new HNP.

The third LMA receiving the optimized PBA message generates a BCE to form a tunnel with the second LMA (S430).

As such, the third LMA may form a tunnel in which the third LMA can directly communicate with the second LMA through a path optimization process such as performing a binding update to the second LMA. Accordingly, the first mobile terminal can communicate directly with the second mobile terminal via the third LMA and the second LMA without passing through the first LMA.

7 and 8 are flowcharts illustrating a data flow before and after path optimization between LMAs according to embodiments of the present invention.

Referring to FIG. 7, according to the conventional system, data from the first mobile terminal moving from the first domain region to the third domain region is transferred to the third MAG and the third LMA. The data is transmitted from the third LMA to the second LMA via the first LMA, and then to the second mobile terminal through the second MAG. That is, data transfer from the first mobile terminal to the second mobile terminal must pass through the first LMA. This causes a problem that all packets must continue to pass through the LMA1 even when the first mobile station moves away from the first domain region, that is, the first LMA, thereby increasing unnecessary load on the network and being fatal to packet forwarding performance. It can cause problems.

Referring to FIG. 8, in the system according to the exemplary embodiments, a tunnel is formed between both LMAs through a path optimization process between the third LMA and the second LMA. Accordingly, the first mobile terminal and the second mobile terminal can directly communicate by using a tunnel between the third LMA and the second LMA without passing through the first LMA.

As such, the first mobile terminal and the second mobile terminal communicate directly with each other through a tunnel formed between the third LMA and the second LMA, thereby improving packet forwarding performance between the mobile terminal and the counterpart terminal and reducing unnecessary network resources. You can also eliminate the use.

In the detailed description of the present invention described above with reference to the preferred embodiments of the present invention, those skilled in the art or those skilled in the art having ordinary skill in the art will be described in the claims to be described later It will be understood that various modifications and variations can be made in the present invention without departing from the scope of the present invention.

1 is a block diagram illustrating a communication path between mobile terminals in a conventional proxy mobile IPv6-based network.

2 is a block diagram illustrating a system for optimizing a communication path between mobile terminals in a proxy mobile IPv6 based network according to embodiments of the present invention.

3 is a flowchart illustrating a handover process of a method for optimizing a communication path between mobile terminals in a proxy mobile IPv6 based network according to embodiments of the present invention.

4 is a flowchart illustrating a path optimization process between LMAs in a method according to embodiments of the present invention.

5 and 6 are diagrams for explaining types of optimization messages transmitted between LMAs.

7 and 8 are flowcharts illustrating a data flow before and after path optimization between LMAs according to embodiments of the present invention.

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

100: first mobile terminal 200: second mobile terminal

300, 400, 500: first to third domain regions

310, 410, 510: first LMA, second LMA, third LMA

600: first tunnel 700: second tunnel

Claims (12)

In a proxy mobile IPv6-based network, a first mobile terminal managed by a first local mobility manager (LMA) in a first domain region and a second mobile terminal managed by a second LMA in a second domain region communicate with each other. In the method for setting the optimal path between the LMA when the mobile station moves from the first domain area to the third domain area, The first domain and the third domain, wherein a third LMA in the third domain region performs binding update to the first LMA to send the first mobile terminal related traffic received by the first LMA to the third LMA. Performing hand-over between hands; And The third LMA performing a binding update to the second LMA to directly form a tunnel between the third LMA and the second LMA; And the first mobile terminal communicates directly with the second mobile terminal through a tunnel directly formed between the third LMA and the second LMA. 2. The method of claim 1, prior to performing the handover Receiving, by a first Mobile Access Gateway (MAG) of the first domain region, a Router Solicitation (RS) message from the first mobile terminal, and obtaining an ID of the first mobile terminal from the RS message; Transmitting, by the first MAG, an ID of the first mobile terminal to the first LMA using a Proxy Binding Update (PBU) message; The first LMA transmits a Home Network Prefix (HNP) to the first MAG to be allocated to the first mobile terminal by using a Proxy Binding Acknowledgement (PBA) message, and communicates with a binding cache entry (BCE) and the first MAG. Creating a tunnel for; The first MAG receiving the PBA message transmitting the HNP of the first mobile terminal to the first mobile terminal using a Router Advertisement (RA) message; And And setting its own IPv6 address based on the HNP of the first mobile terminal received by the first mobile terminal. The method of claim 1, wherein performing the handover Detecting a connection of the first mobile terminal moved to the third domain area by a third MAG; Requesting, by the third MAG, a binding update from the third LMA by transmitting an ID of the first mobile terminal to the third LMA through a PBU message; Acquiring, by the third LMA, an address of the first LMA through a database storing information of the first mobile terminal; Requesting a binding update from the third LMA to the first LMA of the secured address; The first LMA delivering the HNP of the first mobile terminal through a PBA message and modifying binding information associated with the first mobile terminal stored in a first BCE; And And receiving, by the third LMA, the PBA message, creating a second BCE to form a tunnel with the first LMA. The method of claim 3, wherein After the tunnel is formed between the third LMA and the first LMA, the third LMA forwarding the mobile terminal HNP of the first mobile terminal to the third MAG through a PBA message; And The third MAG further comprises the step of delivering the mobile terminal HNP of the first mobile terminal to the first mobile terminal. The method according to claim 1 or 3, And after the third LMA performs a handover with the first LMA, the third LMA further includes registering information indicating that the first mobile terminal is located in the third domain area in a database. How to. The method of claim 1, wherein forming a tunnel between the third LMA and the second LMA Acquiring, by the third LMA, the second LMA address managing the second mobile terminal from a global database; Sending, by the third LMA, a path optimization PBU message including the HNP of the first mobile terminal to the second LMA; The second LMA storing the HNP and the third LMA of the first mobile terminal received through the path optimization PBU message in its BCE, and transmitting a path optimization PBA message to the third LMA; And The third LMA receiving the PBA message comprises updating its BCE and forming a tunnel with the second LMA. The method of claim 6, wherein the third LMA obtains the second LMA address. Obtaining, by the third LMA, an address of the second mobile terminal from a packet transmitted between the first mobile terminal and the second mobile terminal; The third LMA requesting the global database to authenticate the address of the second mobile terminal; And And the global database authenticating and including the second LMA address of the second domain area in the third LMA. The method of claim 6, The optimization PBU message has an O flag set to a specific bit so that the PBU message is recognized as an optimization PBU message, and includes an HNP of the first mobile terminal. The optimized PBA message is characterized in that the O flag is set to a specific bit so that the PBA message is recognized as an optimized PBA message, and does not include the HNP of the first mobile terminal. In a proxy mobile IPv6-based network, a first mobile terminal managed by a first local mobility manager (LMA) in a first domain region and a second mobile terminal managed by a second LMA in a second domain region communicate with each other. In the system for setting the optimal path between the LMA when the mobile station moves from the first domain area to the third domain area, A second LMA for managing the second mobile terminal; And Perform a handover with the first LMA to form a first tunnel with the first LMA, obtain the second mobile terminal and the second LMA address through the first tunnel and the global database, and then go to the second LMA. Including a third LMA to perform a binding update to form a second tunnel directly with the second LMA, And the first mobile terminal communicates directly with the second mobile terminal via a second tunnel directly formed between the third LMA and the second LMA. The method of claim 9, wherein the third LMA is MAG (Mobile Access Gateway) for detecting the connection of the first mobile terminal moved to the third domain area and transmits the ID of the first mobile terminal to the third LMA through a Proxy Binding Update (PBU) message System characterized in that. The method of claim 10, The third LMA obtains the address of the first LMA using the ID of the first mobile terminal received from the MAG, and requests a binding update to the first LMA to form a tunnel with the first LMA. System characterized. 10. The method of claim 9, The third LMA obtains an address of the second mobile terminal from a packet transmitted between the first mobile terminal and the second mobile terminal and performs an authentication procedure with a global database using the address of the second mobile terminal. And obtain the second LMA address.

Images