KR20050065990A - Internet system suporting network mobility and route optimization method in the same - Google Patents

Abstract

An internet system and a path optimization method for supporting network mobility are disclosed. In the Internet system according to the present invention, terminals including an access router of a visited network, an internal fixed host, an internal visited host, an internal fixed router, and an internal visited router are connected to a lower portion of the visited network. A mobile router that receives an address or is assigned a network prefix CoA and is provided with mobility for assigning a CoA address to each of the internal terminals, and performs a home agent function for storing and managing information of the mobile router, and the mobile router enters the visiting network. Access is performed by performing path optimization using an access router receiving the CoA address of the mobile terminal or the CoA address of the internal terminals through the tunneling with the mobile router and the CoA address of the mobile terminal transmitted from the access router or the CoA address of the internal terminals. Via router The direct packet with the mobile router, or the inner end without including the correspondent node for transmission / reception.

Description

Internet system suporting network mobility and route optimization method in the same}

The present invention relates to an internet network system, and more particularly, to an internet system supporting network mobility and a packet transmission path between a mobile node (MN) and a corresponding node (CN) in the internet network system. A route optimization method for optimizing

Recently, Internet service users are required to provide end-to-end Internet services that are still in use while moving by using mobile devices such as buses, subways, trains and ships. In order to efficiently provide a handover service to wireless mobile terminals installed in such a mobile object, network mobility (NeMo) that supports mobility of several terminals, that is, networks, must be provided instead of one terminal.

In the conventional Mobile IP protocol, the binding information of the mobile node is provided to the home agent (HA) and the corresponding node (CN) by the movement detection of the mobile terminal (hereinafter referred to as a mobile node), and the path is moved by the mobile node. Perform the procedure for the optimization service. IP mobility technologies for mobile nodes include Mobile IPv4 and Mobile IPv6, and network mobility technologies include handover support technology in a NeMo (Network Mobility) environment. The basic procedure for supporting handover service in NeMo environment is based on Mobile IPv6, and new flag bit R is added by extending Binding Update message. In addition, a mobile network prefix option and a mobile network prefix length option have been added to convey routing information of the mobile network.

For handover service in a MeMo environment, a mobile router first registers with a home agent, and then connects to another network and detects network movement, and is assigned a new address prefix from the access router of the mobile network. The mobile node then registers the prefix information of the mobile network with the binding information to the home agent through the binding update packet. The home agent stores and manages binding information of the mobile router in the binding cache, and stores and manages a prefix table for storing prefix information of the mobile network. In addition, the home agent establishes a bidirectional tunnel between the home agent and the mobile router by using binding information to provide a connection between the mobile node and the internet network in the mobile network.

Mobile network service through handover is expected to enable various types of services in the future. Basically, all services currently available through the Internet can be provided to all terminals in a mobile network service environment. The mobility service of a terminal may provide an Internet service while maintaining a connection with an Internet network when an individual moves over several networks while using a cellular phone or a personal digital assistant (PDA). However, in an environment supporting a mobile network, a wired internal internet network exists in a mobile body such as a train, an airplane, or a ship. As such, when a user rides with a mobile terminal such as a PDA or a notebook in a state where a wired network inside the mobile body exists, the user can receive mobile Internet service by connecting to an access pointer installed in the mobile device using a wireless LAN card inside the mobile terminal. Can be. When network mobility is provided as described above, users have the advantage that they can continue to use the Internet service without interruption by mounting the terminal used in the wireless LAN environment of their office or home as it is on the mobile.

As described above, in the mobile network environment, the handover service of the mobile router moves even if the mobile router moves by tunneling between the mobile router and an access router performing the home agent function of the mobile router when the mobile router moves. The service terminals (fixed and mobile terminals) connected to the router can continue to provide Internet service. That is, the service terminals connected to the mobile router do not need to perform any additional processing related to the network movement and can operate independently without any consciousness of the movement.

However, since the handover service procedure is performed by a two-way tunnel between the home agent and the mobile router, the Internet service of the terminals connected to the mobile router is a triangle problem that is presented as a disadvantage in mobile IPv4. Will have This problem has many limitations regarding network resource waste and quality of service. In addition, it takes a lot of time to detect the mobility of the terminals connected to the mobile router, the packet is lost during this delay time, resulting in a deterioration of the quality of service.

Therefore, there is a need for a new method of handover service suitable for a network mobile environment.

The first technical problem to be achieved by the present invention is to provide an Internet system that supports the mobility of the network.

A second technical problem to be achieved by the present invention is to provide a path optimization method for optimizing a packet forwarding path between a mobile node (MN) and a corresponding node (CN) in the Internet system.

A third technical problem to be achieved by the present invention is to provide a packet transmission / reception method of the mobile node after performing the path optimization method.

A fourth technical object of the present invention is to provide a packet transmission / reception method of the corresponding node after performing the path optimization method.

A fifth technical object of the present invention is to provide a recording medium in which the path optimization method is recorded in a program code executable by a computer.

The sixth technical problem to be solved by the present invention is to provide a recording medium in which the packet transmission / reception method of the mobile node is recorded in a program code executable by a computer.

A seventh technical problem to be solved by the present invention is to provide a recording medium in which the packet transmitting / receiving method of the corresponding node is recorded in a program code executable by a computer.

In order to perform the first task, the Internet system according to the present invention is connected to a terminal including a router access router, an internal fixed host, an internal visited host, an internal fixed router and an internal visited router at the bottom, The mobile agent receives the CoA address from the access router of the visited network or the network prefix CoA and provides the mobility to allocate the CoA address to each of the internal terminals, and the home agent function of storing and managing the information of the mobile router. When the mobile router moves to the visited network, the access router receives the CoA address of the mobile terminal or the CoA address of the internal terminals through tunneling with the mobile router, and the CoA address of the mobile terminal transmitted from the access router or the CoA address of the internal terminals. Route optimization using Carried out preferably includes a correspondent node to transmit / receive the packet directly to the mobile router, or the inner terminal without going through the access router.

In order to perform the second task, an access router of a visited network, a mobile router supporting mobility of a network, an access router serving as a home agent of a mobile router, internal terminals connected to a lower part of the mobile router, and a partner node in service According to an exemplary embodiment of the present invention, when a mobile router moves to a visited network in an Internet system, the mobile router performs a handover procedure on the home agent access router using a CoA address allocated from an access router of the visited network. In step (a) registering with the home agent access router, when the packet received through the tunneling with the mobile router is transmitted to the counterpart node, the CoA information of the mobile router is added to inform the counterpart node of the CoA of the mobile router (b). In step (c), the counterpart node performs a Return Routability (RR) procedure. (D) performing a binding procedure with the mobile router, and (e) performing a path optimization procedure by the counterpart node.

In order to perform the second task, an access router of a visited network, a mobile router supporting mobility of a network, an access router serving as a home agent of a mobile router, internal terminals connected to a lower part of the mobile router, and a partner node in service According to the present invention, when the mobile router moves to the visited network in the Internet system, the route optimization method according to the present invention is performed in the counterpart node, the mobile router receives the network prefix CoA from the visited network access router, and allocates the CoA to internal terminals. (A) registering network prefix CoA information allocated from the access router of the visited network through the handover procedure of the visited network as the home agent access router, wherein the home agent access router transmits the received packet to the partner node through tunneling with the mobile router. When transmitting, CoA information of the internal terminal by adding CoA information of the internal terminal Step (b) of informing the counterpart node, step (c) of the counterpart node performing a Return Routability (RR) procedure, step (d) of the counterpart node performing a binding procedure with the mobile router, and the counterpart node's path optimization procedure. It is preferable to include the step (e) to perform.

In order to perform the third task, after the path optimization is performed, the packet transmission method according to the present invention, which is performed in the mobile router supporting the mobility of the network, when the mobile router receives the packet, the received packet is performed by the path optimization. (B) if the packet received in steps (a) and (a) is registered in the binding cache, forwarding by adding routing extension header information for ingress filtering. If the packet received in step (a) is not registered in the binding cache, the mobile router determines whether the packet is to be transmitted to the external link in steps (c) and (c). And (d) adding CoA information to the transmission packet and forwarding the packet through tunneling with the home agent of the mobile router.

In order to perform the third task, after the path optimization is performed, the packet transmission method according to the present invention, which is performed in the mobile router supporting the mobility of the network, when the mobile router receives the packet, the received packet is performed by the path optimization. (B) if the packet received in steps (a) and (a) is registered in the binding cache, forwarding by adding routing extension header information for ingress filtering. If the packet received in step (a) is not registered in the binding cache, the mobile router determines whether the packet is to be transmitted to the external link in steps (c) and (c). And (d) adding CoA information to the transmission packet and forwarding the packet through tunneling with the home agent of the mobile router.

In order to perform the fourth task, after performing path optimization, a packet receiving method according to the present invention performed at a counterpart node of an internet system supporting mobility of a network, when the counterpart node receives a packet, it receives CoA information of a received packet. (A) storing, the counterpart node performs the RR procedure with the internal terminals of the mobile router or the mobile router using CoA information, and (b) the counterpart node binds with the internal terminals of the mobile terminal or the mobile terminal. Preferably, the method includes the step of storing the binding information obtained by performing the binding list.

In order to perform the fourth task, after performing path optimization, a packet transmission method according to the present invention performed at a counterpart node of an Internet system supporting mobility of a network, when a counterpart node receives a packet, a destination address of the received packet is determined. (B) forwarding a packet by adding routing extension header information for source routing to a corresponding CoA when a destination address exists in the binding list in steps (a) and (a) of determining whether the binding list exists in the binding list; If the destination address does not exist in the binding list in step (a), it is preferable to include the step (c) of forwarding the packet as it is.

Hereinafter, an internet system and a path optimization method for supporting network mobility according to the present invention will be described with reference to the accompanying drawings.

1 is a diagram schematically illustrating an Internet service system supporting network mobility. The Internet service system shown in FIG. 1 is a service environment in which a mobile object constituting a mobile network moves rather than terminal mobility in a conventional mobile IP service environment. Here, the moving body constituting the mobile network may be an airplane, a car, a bus, a ship, a train, or the like.

The mobile router 10 of the mobile constituting the mobile network may be connected to the mobile internal network 40 with the internal service terminal 60 and the internal router 50 constituting the lower network. In such a mobile network, an access router 20 of the Internet supports a mobile access service of a mobile router, and is an environment in which a wireless connection is made through a base station 30 device.

2 is a view showing in more detail the moving inner network of FIG.

Referring to FIG. 2, an access router (AR) 210 performs a home agent function of a mobile router (MR) 240 and initially of the home interface 220 of the mobile router 240. It is connected to the home link. The mobile router 240 is currently connected through a visited link of the access router 230 of the visited network 100. The lower part of the mobile router 240, the internal fixed host (LFH: Local Fixed Host, 270), internal landing host (LMH: Local Mobile Host, 250), internal fixed router (LFR: Local Fixed Router, 260) and internal landing router And the like.

3 is a flowchart illustrating a handover service procedure for supporting network mobility in the system shown in FIG. 2. 3 shows a basic service procedure of NeMo, and shows a procedure of supporting a mobile service using tunneling between a mobile router and a home agent when the mobile router moves.

2 and 3, when the mobile router 240 moves to the visited network 100, the mobile router 240 receives a Router Advertisement (RA) message from the access router 230 of the visited network. In step 310, the movement is detected (step 320).

After operation 320, the mobile router 240 receives a care of address (CoA) from the access router 230 of the visited network 100 (operation 330). The mobile router 240 registers its home address (HA) and CoA allocated from the access router 230 of the visited network 100 to the home agent (step 340). Registration is performed by binding Binding Update (BU) (step 342) and receiving a Binding Acknowledgement (BA) message (step 344) of the conventional mobile IP. Meanwhile, in step 342, mobile network prefix information is additionally delivered to the BU message.

After the operation 344, when the home agent 210 of the mobile router 240 transmits the packet received through the tunneling with the mobile router 240 to the counterpart node 200 (operation 350), the mobile router 240 transmits the packet. By transmitting the packet to which the CoA information is added to the counterpart node 200, the CoA of the mobile router 240 is informed to the counterpart node 200 (operation 360).

Through this process, when the mobile router 240 moves, tunneling is established between the mobile router 240 and the home agent 210 of the mobile router 240, thereby providing continuous service.

4 is a flowchart illustrating a procedure of newly assigning a network prefix CoA of the mobile router 240 from the access router 230 of the visited network 100 to support network mobility.

Referring to FIG. 4, when the mobile router 240 receives a new network prefix CoA (step 510), the mobile router 240 allocates a new CoA to each node in the mobile router 240 (520). step). The mobile router 240 binds and updates the network prefix CoA information to the home agent 210 (step 530), and receives a BA message from the home agent 210 (step 540) to the home prefix 210. Register CoA information.

5 is a diagram illustrating a CoA registration procedure of terminals in the mobile router 240 to the counterpart nodes CN.

Referring to FIG. 5, if the mobile router 240 is assigned a new network prefix CoA from the access router 230 of the visited network and registers the network prefix CoA information assigned to the home agent 210 of the mobile router 240, In operation 610, the mobile router 240 generates CoAs of terminals in the mobile router 240 using the new network prefix CoA information. CoA of each terminal uses the network prefix information and the lower EUI-64 bit information of the source address of the received packet to the packet transmitted by tunneling from the mobile router 240 using the registered network prefix CoA. CoA can be generated. The mobile router 240 informs the CN of the destination of the movement information by adding CoA information of each terminal to the received packet (step 620). Using this information, the CN performs the RR procedure.

That is, when the mobile router 240 moves to the visited network 100, the mobile router 240 obtains a CoA address from the access router 230 of the visited network 100, as described with reference to FIG. 3. 4 or 5, as described with reference to FIGS. 4 and 5, the network prefix CoA may be allocated from the access router 230 of the visited network 100. Each procedure described hereinafter will be described by comparing the case where the mobile router 240 is assigned a CoA address from the access router 230 and the case where the network prefix CoA is allocated.

FIG. 6 is a diagram illustrating a Return Routability (RR) procedure performed at a counter node CN. RR performance performed in the CN may be divided into when CoA information of the mobile router 240 is received and when CoA information of the terminals LFN / LMN in the mobile router 240 is received. By using this CoA information, the CN can unify the CN to perform the RR procedure that was conventionally performed in the mobile router 240 or an internal terminal (MN: Mobile Node) of the mobile router 240.

First, when the CN receives the CoA address of the mobile router 240, the CN transmits a Home Test Init message to the mobile router 240 via the home agent 210 (step 710). . Subsequently, a Care of Test Init message is transmitted using the received CoA information (step 720). The CN sequentially receives the Home Test message and the Care of Test message from the mobile router 240 in response to the Home Test Init message and the Care of Test Init message (steps 730 and 740) to perform an RR procedure.

On the other hand, when the CN receives the CoA address for the internal terminals (LFN / LMN) of the mobile router 240, the CN sends a Home Test Init message via the home agent 210 to the mobile router ( In step 760, it transmits to the internal terminals LFN / LMN. Subsequently, a Care of Test Init message is transmitted using the received CoA information (step 770). The CN sequentially receives the Home Test message and the Care of Test message from the internal terminals (LFN / LMN) of the mobile router 240 in response to the Home Test Init message and the Care of Test Init message (steps 730 and 1st). Step 740) performs the RR procedure.

7 is a diagram illustrating a binding procedure in the CN 200. These binding procedures are performed after performing the RR procedure described with reference to FIG. 6, and also when the CN receives the CoA information of the MR 240 and the CoA information of the internal terminals of the MR 240. Can be divided.

First, when the CN 200 receives the CoA information of the MR 240, the CN 200 transmits a Binding Update (BU) message to the MR 240 (step 810), and a Bonding Acknowledge (BA) message from the MR 240. In step 820, the binding information registration procedure between the CN 200 and the MR 240 is performed.

On the other hand, when the CN 200 directly receives the CoA of the internal terminals (LFN / LMN) of the MR 240, and transmits the BU message directly to the internal terminals (LFN / LMN) (step 860), The binding information registration procedure is performed by receiving a BA message from the internal terminals LFN / LMN (step 870).

8 is a diagram illustrating a path optimization procedure in the CN 200. The path optimization procedure of the CN 200 is a procedure performed after the binding procedure of the CN 200 described with reference to FIG. 7 is performed. Also, the CN 200 receives the CoA of the MR 240 and the MR. 240 may be divided into a case in which CoA is received.

Referring to FIG. 8, when the CN 200 receives the CoA of the MR 240, the CN 200 transmits a packet having the CoA of the MR 240 as a destination address (step 910). In step 240, the receiver receives the received packet and performs a predetermined transmission / reception procedure to process the received packet (step 920). The packet transmission / reception procedure of the MR 240 will be described in detail with reference to FIGS. 9 and 10.

When the CN 200 receives the CoA of the MR 240 internal terminals LFN / LMN, the CN 200 forwards the packet to the CoA of the internal terminal LFN / LMN (step 960).

Meanwhile, the packet transmitted from the CN 200 is a packet to which a routing extension header for source routing processed by the MR 240 is added.

9 and 10 are flowcharts illustrating a packet transmission and reception procedure of the mobile router 240.

First, referring to FIG. 9 illustrating a packet transmission procedure, when the mobile router 240 receives a packet (step 400), the mobile router 240 determines whether the received packet is registered in a binding cache (second step). Step 405). For reference, when the path optimization is performed, a binding cache is created in the mobile router 240.

In step 405, if the received packet is registered in the binding cache, routing extension header information for ingress filtering is added (step 425) and forwarded (step 430). On the other hand, if the binding cache information is not registered in step 405, it is determined whether the packet to be transmitted to the external link (step 410).

In step 410, if the packet is to be transmitted to the external link, CoA information of the mobile router 240 is added to the transmission packet (step 415), and tunneling with the home agent 210 of the mobile router 240 (step 420). In step 430, the packet is forwarded. Here, when tunneling with the home agent 210, the source address SA is the CoA address of the MR 240, and the destination address DA is the home agent 210 address of the MR 240. On the other hand, in step 410, if the packet is not transmitted to the external link, the packet is forwarded without further processing (step 430).

As described with reference to FIG. 9, when the MR 240 performs a path optimization procedure with the CN 200 in service and registers packet information in the binding cache, the home agent 210 of the mobile router 240 is determined. The mobile router 240 can send a packet directly to the CN 200 without going through it.

Referring to FIG. 10 illustrating a packet receiving procedure, when a packet is received (step 450), the mobile router 240 determines whether the received packet is a tunneling packet (step 455), and decapsulation if it is a tunneling packet. (Step 460).

If the received packet is not a tunneling packet or after step 460, it is determined whether the received packet is a packet requiring return return (RR) (step 465). In step 465, if the received packet is an RR request packet, an RR procedure defined in Mobile IPv6 is performed (step 470).

If it is determined that the packet is not an RR request packet after step 465 or step 460, it is determined whether the received packet includes a routing extension header for source routing by path optimization (step 475). If the packet received in step 475 includes a routing extension header, a routing header for source routing is processed (step 480), and the processed packet is forwarded (step 485). If the packet received in step 475 does not include a routing header, the packet is forwarded as it is (step 485).

11 and 12 are flowcharts illustrating a packet transmission and reception procedure in a CN after performing a path optimization procedure.

First, referring to FIG. 11 illustrating a packet reception procedure in the CN 200, when the packet is received (step 1000), the CN 200 stores CoA information of the received packet (step 1100).

After step 1100, the CN 200 performs an RR procedure with the MR 240 using CoA information (step 1200). After operation 1200, the binding information obtained by performing the binding procedure with the MR 240 or the MR 240 internal terminals, that is, CoA of the MR and home address information of the MR 240 internal terminal is stored in the binding list. Step 1300).

Referring to FIG. 12 illustrating a packet transmission procedure in the CN 200, when a packet is received (step 1500), it is determined whether a destination address exists in the binding list (step 1600), and if it exists, source routing to a corresponding CoA. Forward the packet by adding routing extension header information for operation (step 1700) (step 1800). Here, the CoA may be CoA of MR 240 or MR 240 internal terminals. On the other hand, if the destination address does not exist in the binding list, the packet is forwarded as it is.

The invention can also be embodied as computer readable code on a computer readable recording medium. The computer-readable recording medium includes all kinds of recording devices in which data that can be read by a computer system is stored. Examples of computer-readable recording media include ROM, RAM, CD-ROM, magnetic tape, floppy disk, optical data storage, and the like, which are also implemented in the form of a carrier wave (for example, transmission over the Internet). It also includes. The computer readable recording medium can also be distributed over network coupled computer systems so that the computer readable code is stored and executed in a distributed fashion.

The best embodiments have been disclosed in the drawings and specification above. Although specific terms have been used herein, they are used only for the purpose of describing the present invention and are not used to limit the scope of the present invention as defined in the meaning or claims. Therefore, those skilled in the art will understand that various modifications and equivalent other embodiments are possible from this. Therefore, the true technical protection scope of the present invention will be defined by the technical spirit of the appended claims.

As described above, according to the Internet system and the path optimization method for supporting network mobility according to the present invention, when the mobile router, which is the subject of the mobile network, moves in a network moving environment, The terminal may provide an environment in which a service environment in which terminals may not recognize movement and continue to maintain a service may be provided. In addition, path optimization can eliminate resource waste and reduce service delays to improve the quality of service being provided.

1 is a diagram schematically illustrating an Internet service system supporting network mobility.

2 is a view showing in more detail the moving inner network of FIG.

3 is a flowchart illustrating a handover service procedure for supporting network mobility in the system shown in FIG. 2.

4 is a flowchart illustrating a procedure of newly assigning a network prefix CoA of the mobile router 240 from the access router 230 of the visited network 100 to support network mobility.

5 is a diagram illustrating a CoA registration procedure of terminals in the mobile router 240 to the counterpart nodes CN.

FIG. 6 is a diagram illustrating a Return Routability (RR) procedure performed at a counter node CN.

7 is a diagram illustrating a binding procedure in the CN 200.

8 is a diagram illustrating a path optimization procedure in the CN 200.

9 and 10 are flowcharts illustrating a packet transmission and reception procedure of the mobile router 240.

11 and 12 are flowcharts illustrating a packet transmission and reception procedure in a CN after performing a path optimization procedure.

Claims (20)

Access router in a visited network; Terminals including an internal fixed host, an internal visited host, an internal fixed router, and an internal visited router are connected to the lower side, and when a mobile network is moved to a visited network, a CoA address is allocated from an access router of the visited network or a network prefix CoA is assigned. A mobile router provided with mobility for allocating a CoA address to each of internal terminals; Performs a home agent function for storing and managing information of the mobile router, and when the mobile router moves to the visited network, receives a CoA address of the mobile terminal or CoA addresses of the internal terminals through tunneling with the mobile router An access router; And A partner performing route optimization using the CoA address of the mobile terminal or the CoA addresses of the internal terminals transmitted from the access router to directly transmit / receive packets with the mobile router or the internal terminals without passing through the access router. Internet system supporting network mobility, characterized in that it comprises a node. The mobile system in the Internet system including an access router of the visited network, a mobile router supporting mobility of the network, an access router serving as a home agent of the mobile router, internal terminals connected to the lower part of the mobile router, and a partner node in service. In the path optimization method performed in the partner node when a router moves to the visited network, (a) the mobile router registering a CoA address assigned from the access router of the visited network through the handover procedure with the home agent access router; (b) when the home agent access router transmits the packet received through the tunneling with the mobile router to the counterpart node, adding the CoA information of the mobile router to inform the counterpart CoA of the mobile router; (c) the counterpart node performing a Return Routability (RR) procedure; (d) the counterpart node performing a binding procedure with the mobile router; And (e) a path optimization method in an internet system supporting network mobility, wherein the counterpart node performs a path optimization procedure. The method of claim 2, wherein step (a) (a1) detecting a movement by receiving a Router Advertisement (RA) message from the visited network access router when the mobile router moves to the visited network; (a2) the mobile router receiving the CoA from the visited network access router; And (a3) The mobile router includes registering a home address and a CoA allocated from the visited network access router to the home agent access router. The method of claim 3, wherein step (a3) (a31) binding, by the mobile router, of its home address, Coa, and mobile network prefix information to the home agent access router; And (a32) The mobile router includes a step of receiving a binding acknowledgment (BA) message from the home agent access router. The method of claim 2, wherein step (c) (c1) the counterpart node transmitting a Home Test Init message to the mobile router via the home agent access router; (c2) the counterpart node transmitting a Care of Test Init message using CoA information of the mobile router; And (c3) the partner node sequentially receiving a home test message and a care of test message in response to the home test init message and the care of test init message from the mobile router; Path optimization method on Internet systems that support it. The method of claim 2, wherein step (d) (d1) the counterpart node transmitting a Binding Update (BU) message to the mobile router; And and (d2) the counterpart node receiving a Bonding Acknowledge (BA) message from the mobile node. The method of claim 2, wherein step (e) (e1) the counterpart node transmitting a packet having CoA of the mobile router as a destination address; And (e2) a method of optimizing a path in an internet system supporting network mobility, wherein the mobile router processes a packet transmitted from the counterpart node through a predetermined transmission / reception procedure. The method of claim 13, wherein the transport packet of the counterpart node is a packet added by a routing extension header for source routing processed by the mobile router. The mobile system in the Internet system including an access router of the visited network, a mobile router supporting mobility of the network, an access router serving as a home agent of the mobile router, internal terminals connected to the lower part of the mobile router, and a partner node in service. In the path optimization method performed in the partner node when a router moves to the visited network, (a) The mobile router receives a network prefix CoA from the visited network access router, allocates a CoA to the internal terminals, and receives the network prefix CoA information allocated from the access router of the visited network through a predetermined handover procedure. Registering with the home agent access router; (b) The home agent access router informs the counterpart node of CoA information of the internal terminal by adding CoA information of the internal terminal when transmitting a packet received through tunneling with the mobile router to the counterpart node. step; (c) the counterpart node performing a Return Routability (RR) procedure; (d) the counterpart node performing a binding procedure with the mobile router; And (e) a path optimization method in an internet system supporting network mobility, wherein the counterpart node performs a path optimization procedure. The method of claim 9, wherein step (a) (a1) detecting a movement by receiving a Router Advertisement (RA) message from the visited network access router when the mobile router moves to the visited network; (a2) the mobile router receiving a new network prefix CoA from the visited network access router; (a3) the mobile router allocating new CoAs to the internal terminals; And (a4) The mobile router binds and updates the network prefix CoA information to the home agent access router, receives a BA message from the home agent access router, and registers the network prefix CoA information with the home agent access router. Path optimization method in the Internet system supporting the network mobility, characterized in that it comprises a. The method of claim 9, wherein step (b) (b1) The mobile router home agent uses the network prefix information and the lower EUI-64 bit information of the source address of the received packet to the packet tunneled from the mobile router by using the registered network prefix CoA. Generating a CoA of a terminal of the terminal; And  (b2) wherein the mobile router home agent adds CoA information of each terminal to a received packet and transmits the information to the counterpart node as a destination to inform the mobile terminal of the mobile terminal; How to optimize routes on supported internet systems. The method of claim 9, wherein step (c) (c1) the counterpart node transmitting a Home Test Init message to the internal terminals via the home agent access router; (c2) the counterpart node transmitting a Care of Test Init message using the received CoA information; And (c3) the counterpart node comprises sequentially receiving a Home Test message and a Care of Test message from the internal terminals in response to the Home Test Init message and the Care of Test Init message. How to optimize paths in Internet systems that support mobility. The method of claim 9, wherein step (d) (d1) the counterpart node transmitting a Binding Update (BU) message to the internal terminals; And and (d2) the counterpart node receiving a Bonding Acknowledge (BA) message from the internal terminals. The method of claim 9, wherein step (e) (e1) the counterpart node transmitting a packet having CoA of the internal terminal as a destination address; (e2) The method of optimizing a path in an internet system supporting network mobility, wherein the internal terminal processes a packet transmitted from the counterpart node through a predetermined packet transmission / reception procedure. 15. The method of claim 14, wherein the transport packet of the counterpart node is a packet added by a routing extension header for source routing processed by the mobile router. In the packet transmission method performed in the mobile router supporting the mobility of the network after performing the path optimization, (a) when the mobile router receives the packet, determining whether the received packet is registered in the binding cache generated when the path optimization is performed; (b) if the packet received in step (a) is registered in the binding cache, forwarding by adding routing extension header information for ingress filtering; (c) if the received packet is not registered in the binding cache in step (a), determining whether the packet is to be transmitted to an external link; And (d) if the packet is to be transmitted to the external link in step (c), adding CoA information of the mobile router to the transmission packet, and forwarding the packet through tunneling with a home agent of the mobile router. A packet transmission method performed in a mobile router supporting mobility of a network. In the packet receiving method performed in the mobile router supporting the mobility of the network after performing the path optimization, (a) the mobile router, if a packet is received, determining whether the received packet is a tunneling packet, and decapsulating if the packet is a tunneling packet; (b) performing an RR procedure defined in Mobile IPv6 if the received packet or the decapsulated packet is a packet requiring RR; (c) if the packet having performed the RR procedure includes a routing extension header for source routing by path optimization, processing the routing header for source routing, and forwarding the processed packet; And and (d) forwarding the packet as it is, if the packet having performed the RR procedure does not include a routing header. The method of claim 17, If the received packet or the decapsulated packet includes a routing extension header for source routing, processing a routing header for source routing, and forwarding the processed packet; And If the received packet or the decapsulated packet does not include a routing header, forwarding the packet as it is, the packet receiving method performed by the mobile router supporting the mobility of the network. In the packet receiving method performed in the opposite node of the Internet system supporting the mobility of the network after performing the path optimization, (a) when the counter node receives a packet, storing CoA information of a received packet; (b) the counterpart node performing an RR procedure with a mobile router or internal terminals of the mobile router using CoA information; And and (c) the counterpart node storing the binding information obtained by performing a binding procedure with the mobile terminal or internal terminals of the mobile terminal in a binding list. In the packet transmission method performed in the partner node of the Internet system supporting the mobility of the network after performing the path optimization, (a) when the counter node receives a packet, determining whether a destination address of the received packet exists in a binding list; (b) forwarding a packet by adding routing extension header information for source routing to a corresponding CoA when the destination address is present in the binding list in step (a); And and (c) forwarding the packet as it is, if the destination address does not exist in the binding list in step (a).