KR100976603B1 - Method and apparatus for supporting the mobility of node using by layer 2/layer 3 addresses - Google Patents

Abstract

The present invention relates to a network-based mobility support technology for a node having no mobility support function. A mobility support method for a mobile node performed by an access network-specific agent connecting an access network and an internet protocol core network integrating the access networks according to the present invention includes an address of a mobile node connected to the access point from an access point. Obtaining address information for obtaining information; A location registration step of registering the location of the mobile node by transmitting the obtained mobile node address information and the third layer address information of the agent to the management device managing the access networks located in the internet protocol core network; Transmitting agent address information of the agent to the mobile node so that the mobile node can transmit a data packet to the agent; And a packet transmission / reception processing step of processing data packet transmission and reception between the mobile node and the corresponding node in consideration of address information of the mobile node and information registered in the management apparatus. This has the effect of providing high speed mobility to the mobile node.

Description

Method and apparatus for supporting the mobility of node using by layer 2 / layer 3 addresses}

The present invention relates to an Internet Protocol (IP) based network, and more particularly, to a mobility support technology for a mobile node (MN).

This study was derived from a study conducted as part of the IT growth engine technology development project of the Ministry of Information and Communication and the Institute of Information and Telecommunications Research and Development. [Task Management Number: 2006-S-058-02, All-IP-based Integrated Network Service Control Technology] Development]

The mobility support technology for mobile nodes (MNs) in a general IP-based network is Mobile IP of the Internet Engineering Task Force (IETF). In addition, there are IP-based mobility support technologies, but these technologies operate in three layers (Layer 3, L3). These L3 mobility technologies perform their operations when the processing of the mobile node in the second layer (Layer 2, L2) is completed and is registered as a remote address or location manager. In the process of message transmission through L3 routing in. During this delay, the mobile node cannot communicate, and if this delay is prolonged, the communication connection maintained by the mobile node may be lost. For this reason, fast mobility processing has become an important technology element for mobility technology, and in order to realize this, new approaches and environmental improvements are required due to limitations of existing L3 mobility technology.

The present invention is derived from this background, and aims to minimize the delay for the mobility processing of the mobile node.

According to the present invention for achieving the above technical problem, a mobility support method for a mobile node performed in an access network-specific agent connecting an access network and an internet protocol core network integrating the access networks, the access point from the access point; An address information obtaining step of obtaining address information of the mobile node connected to the access point; A location registration step of registering the location of the mobile node by transmitting the obtained mobile node address information and the third layer address information of the agent to the management device managing the access networks located in the internet protocol core network; Transmitting agent address information of the agent to the mobile node so that the mobile node can transmit a data packet to the agent; And a packet transmission / reception processing step of processing data packet transmission and reception between the mobile node and the corresponding node in consideration of address information of the mobile node and information registered in the management apparatus.

Meanwhile, in order to achieve the above technical problem, mobility support for a node performed in a management apparatus that is located in an Internet protocol core network and communicates with an agent for each access network that manages a node wirelessly connected to an access point is performed. The method comprises: an information obtaining step of obtaining, from an agent for each access network, second layer address information and permanent address information of a node connected to the access point, and third layer address information of the agent; A management step of mapping and managing the obtained address information; A message receiving step of receiving a request message for requesting three-layer address information of a receiving agent managing the corresponding node from a transmitting agent which is to transmit a data packet to a corresponding node; Retrieving three-layer address information of the receiving agent from the mapping-managed information in response to receiving the message; And a transmitting step of transmitting the retrieved three-layer address information of the receiving agent to the transmitting agent.

On the other hand, the mobility support method for a mobile node performed in an access point communicating with an agent connecting an access network and an Internet protocol core network, according to the present invention for achieving the above-described technical problem, forms a wireless channel with the mobile node Making; Acquiring layer 2 address information of the mobile node in the radio channel formation process; And transmitting the second layer address information of the secured mobile node to the agent that is to perform location registration of the mobile node instead of the mobile node.

On the other hand, according to the present invention for achieving the above technical problem, the mobility support device for a mobile node for each access network connecting the access network and the Internet Protocol core network integrating the access network, the mobility connected to the access point A management unit managing information related to the node and managing information related to a corresponding node connected to an access point of another access network; And a transmission / reception processing unit which processes data packet transmission and reception between the mobile node and the corresponding node with the information managed by the management unit.

On the other hand, according to the present invention for achieving the above-described technical problem, the management device located in the Internet Protocol core network, and capable of communicating with an agent for each access network that manages a node wirelessly connected to the access point is a node connected to the access point. A central management unit that manages the persistent address information and three-layer address information of the agent managing the node, and manages the communication connection state between the nodes; And at the request of the agent managing the mobile node attempting to communicate with the corresponding node, return the permanent address information of the corresponding node managed by the central management unit and the three-layer address information of the agent managing the corresponding node, and And an information providing unit for returning the permanent address information of the mobile node managed by the central management unit and the third layer address information of the agent managing the mobile node to the corresponding node.

The present invention provides a high speed mobility service for a mobile node in an IP network environment. Accordingly, the present invention creates an effect of improving the mobility processing delay problem through the L2 trigger function and high-speed mobility signaling through a predetermined control channel. In particular, due to this operation feature, the fast mobility processing starts through the L2 trigger for the movement of the node, the fast message transmission through the preset control channel between each HCA and the MICS, and the mobile node or the correspondent node through the tunneling supported by each HCA. High-speed mobility support service without separate information transfer process is possible.

The foregoing and further aspects of the present invention will become more apparent through the preferred embodiments described with reference to the accompanying drawings. Hereinafter, the present invention will be described in detail to enable those skilled in the art to easily understand and reproduce the present invention.

1 is a diagram illustrating an overall configuration of a network environment according to the present invention.

An AP 200, which is a wireless access device, may communicate with a network access device that connects an access network and an IP core network. In the present specification, the network access device is a mobility support device for a node, hereinafter referred to as a handover control agent (HCA) 300. The AP 200 performs a function of extracting the L2 address for the node and transmitting the extracted L2 address to the HCA 300 in the local area through a layer 2 (L2) connection process with the node.

The HCA 300 located at the edge of the IP core network is a permanent address (PA) for nodes belonging to a lower management area (an IP address that does not change when a node is handed over to another access network area). It maintains and manages information such as an L2 address, an LA, and an interface to an AP where a node is located. The information is managed by a Local Node Address Management Table (LNAT) shown in FIG. In addition, the HCA 300 manages the permanent addresses of the correspondent nodes with which nodes located in the access network connected to it want to communicate, the L3 address of the HCA where the correspondent node is located, and the tunnel interface address to the HCA where the correspondent node is located. The information is managed by a Correspondent Node Address Management Table (CNAT) shown in FIG. In addition, the HCA 300 performs encapsulation and decapsulation functions for data packets. For example, the HCA # 1 300-1 encapsulates the data packet transmitted from the mobile node 100 and transmits it to the correspondent node 500, and decapsulates the data packet transmitted from the correspondent node 500. And transmit to the mobile node 100.

On the other hand, the management information (Mobility Information Control Server, MICS) (400) located in the IP core network performs the function of managing the location of the nodes, and can be mounted on a high-performance server, router or switch in the network in the IP nose. have. The MICS 400 according to the present invention receives and maintains L2 address, LA, and L3 address information of the HCA for the node from the HCAs 300, and the information is stored in the global location management table (shown in FIG. 9). Global Location Management Table (GLMT). In addition, the MICS 400 maintains and manages information on communication connections between nodes, and the information is managed by a communication node mapping table (CNMT) shown in FIG. 10. The MICS 400 managing such GLMT and CNMT provides these information to the HCAs 300.

There is one or more dynamic or preset control channels between the MICS 400 and the HCS 300. This control channel is preferably used for traffic for mobility processing of a node according to the invention. If the Multiprotocol Label Switching (MPLS) technology is applied to the IP core network, a LSP (Label Switched Path) is established between the MICS 400 and the HCS 300 as a control channel for transmitting and receiving mobility signaling. It is available.

2 is a flowchart illustrating a location and address registration process of a network-based node according to the present invention. Referring to FIG. 2, an initial location and address registration procedure when the mobile node 100 is connected to an access network connected to an IP core network for the first time will be described. This procedure indicates an initial setup process due to the loss of information related to the mobile node 100 because the mobile node 100 has no connection to the access network for communication for a long time.

When the mobile node 100 enters the access network # 1 region, L2 handoff is performed for establishing a radio channel with the AP # 1 200-1. During the L2 handoff process, the AP # 1 200-1 receiving an L2 association request from the mobile node 100 secures an L2 address, which is location information about the mobile node 100, through an L2 trigger function. The combined response is sent to the mobile node 100 (step S210) (step S220). At the same time, AP # 1 200-1 transmits the L2 address of the mobile node 100 to HCA # 1 300-1 to which AP # 1 200-1 belongs using the location report message (step S230). The L2 address may be an 'Ethernet 48-bit MAC address',' 3GPP2 International Mobile Station Identity and Connection ID ',' 3GPP International Mobile Subscriber Identity ', or '64 -bit Global ID, EUI-64'. L2 coupling means that a wireless channel is formed between a node and an AP using a Layer 2 protocol, that is, a wireless MAC protocol such as IEEE 802.11. In the process of exchanging a wireless MAC protocol between the node and the AP, the AP according to the present invention secures an L2 address equal to the node's MAC.

The HCA # 1 300-1 records the L2 address of the mobile node 100 included in the location report message in the LNAT shown in FIG. 7. In some cases, the HCA # 1 300-1 generates a valid LA (L3 address) in its management area, maps it to the L2 address of the mobile node 100, and records the LLA in the LNAT. In addition, the HCA # 1 300-1 transmits to the L2 address of the mobile node 100, LA, and L3 of the HCA # 1 300-1 (step S240). Here, an IPv4 or IPv6 address may be used as the L3 address of the HCA. The MICS 400 receives the location registration message transmitted from the HCA # 1 300-1, generates a record for the mobile node 100 in the GLMT, and then the mobile node 100 included in the location registration message. Record L2 address, L3 address of LA and HCA # 1 300-1 in the corresponding record.

Meanwhile, the HCA # 1 300-1 transmits the L3 address of the HCA # 1 300-1 to the mobile node 100 by using the address information message, and optionally, the LA to be used by the mobile node 100. Send together (step S250). Here, LA refers to a temporary L3 address (eg, an IP address) that the mobile node 100 can use in the access network # 1 area. In the case of HCA # 1 (300-1), since it is difficult to check the path of the node that is connected because there are many managed nodes, the mobile node 100 generates and assigns an LA to be used in the access network # 1 area. -1) can easily manage the connected nodes. Therefore, in a network environment requiring such management, a process of creating and assigning an LA in HCA # 1 300-1 is preferably implemented.

The mobile node 100 receives the address information message and changes its default gateway address to the L3 address of the HCA # 1 300-1 included in the message. Accordingly, the mobile node 100 can transmit the data packet using the default gateway address. In addition, the mobile node 100 transmits an address information response message to the HCA # 1 300-1 in response to receiving the address information message, and notifies the fact of the response, but transmits the PA information of the mobile node 100 to the address information response message. The self PA is notified to HCA # 1 300-1 (step S260). The HCA # 1 300-1 receives the address information response message transmitted from the mobile node 100, extracts the PA of the mobile node 100 included in the message, and records the PA in the corresponding record of the LNAT. In addition, the PA of the mobile node 100 is notified to the MICS 400 through the address update message (step S270). The MICS 400 receives the address update message transmitted from the HCA # 1 300-1, extracts the PA of the mobile node 100 included in the message, and records the PA in the corresponding record of the GLMT. Through this process, basic location and address registration of the mobile node 100 is performed.

3 illustrates a process to be processed for mobility support in data packet transmission between two nodes according to the present invention.

The mobile node 100 sends a data packet as in a typical packet network for communication with a corresponding node 500 using the default gateway address set through the process of FIG. 2 (step S310). At this time, the destination address of the packet header is set to the PA of the corresponding node 500, and the source address is set to the PA of the mobile node 100. The first data packet sent for communication from the mobile node 100 is routed to HCA # 1 300-1, which serves as the default gateway for the area in which the mobile node 100 is located. The HCA # 1 300-1 finds the L3 address of the HCA # 3 300-3 mapped to the CNAT with the PA of the corresponding node 500 which is the destination address of the packet routed to the HCA # 1 300-1. If the L3 address of HCA # 3 (300-3) is not in CNAT, HCA # 1 (300-1) MICS (location information request message containing the PA of the correspondent node 500 and the PA of the mobile node 100). 400) (step S320). And preferably, the data packet from the mobile node 100 is buffered (step S330).

The MICS 400 receiving the location information request message from the HCA # 1 300-1 searches for the L3 address of the HCA # 3 300-3 with the PA information of the corresponding node 500 in the GLMT therein. The location information response message including the PA information of the corresponding node 500 and the L3 address of the retrieved HCA # 3 300-3 is transmitted to the HCA # 1 300-1 (step S340). The MICS 400 maps and records the PA of the mobile node 100 and the PA of the corresponding node 500 to CNMT for recording whether the mobile node 100 and the corresponding node 500 communicate with each other. In addition, the MICS 400 searches for the L3 address of the HCA # 1 300-1 with the PA information of the mobile node 100, and retrieves the PA information of the mobile node 100 and the retrieved HCA # 1 300-1. The location information transfer message including the L3 address is transmitted to the HCA # 3 300-3 (step S350).

HCA # 1 (300-1) and HCA # 3 (300-3) receiving these messages add the L3 address information of the PA and the counterpart HCA included in the received message to each internal CNAT. Through this process, the L3 address information of the PA and HCA of each other required for mutual communication between the mobile node 100 and the corresponding node 500 is obtained from CNAT and HCA # 3 (300-) of each HCA # 1 300-1. It is registered in CNAT of 3). During this registration process, additional functions can be added by allocating additional information spaces to configuration tables of LNAT, CNAT, GLMT, and CNMT according to the development environment.

After completing the above-described process, the HCA # 1 300-1 tunnels the data packet from the mobile node 100 that has been buffered and transmits it to the HCA # 1 300-1. In this case, when the HCA # 1 300-1 and the HCA # 3 300-3 are connected to the IP core network, the destination address is HCA # 3 300-3 where the corresponding node 500 is located and the source address. Encapsulates and tunnels the packet header, which is the HCA # 1 300-1 in which the mobile node 100 is located, and transmits the encapsulated and tunneled HCA # 3 300-3 (step S360). After receiving the data packet, the HCA # 3 300-3 performs decapsulation (step S370), and then searches for LNAT to access the AP # 3 200-3 where the corresponding node 500 is located. It finds an interface and forwards the data packet to the corresponding node 500.

In addition, when the correspondent node 500 transmits a data packet to the mobile node 100, when the destination address is set to the PA of the mobile node 100 and the source address is set to the PA of the corresponding node 500, the HCA is transmitted. In # 3 (300-3) it is encapsulated in a packet header with the destination address of HCA # 1 (300-1) where the mobile node 100 is located and the source address of HCA # 3 (300-3). 300-1) (step S380). After receiving the data packet, the HCA # 1 300-1 searches for the LNAT after performing decapsulation (step S390), and accesses the AP # 1 200-1 where the mobile node 100 is located. It finds the interface and forwards the data packet to the mobile node 100.

4 is a flowchart illustrating a handover process according to movement of a node to a new access network area according to the present invention. 4 illustrates a case in which the mobile node 100 performing data communication as in the process of FIG. 3 moves to a new access network area, the mobile node 100 for smooth communication with the corresponding node 500 together with fast handover processing. ) Shows the process of registering the L3 address of the HCA # 2 (300-2) of the newly located area in the MICS (400), and communicates between the HCA # 2 (300-2) and the HCA # 3 (300-3). In addition, if a mobile node needs an LA address in some cases, it shows the process of assigning a new LA address.

When the mobile node 100 moves to a new access network area as shown in FIG. 1, the L2 handoff process is performed through the association request and the response to establish a radio channel with the AP # 2200-2. (Step S405) (step S410). In this process, the AP # 2200-2 secures the L2 address of the mobile node 100 through the L2 trigger function, and uses the location report message to obtain the L2 address of the obtained mobile node 100 using the location report message. Transmit to 300-2 (step S415). HCA # 2 300-2 records the L2 address of the received mobile node 100 in the LNAT. In some cases, an LA to be temporarily assigned to the mobile node 100 is generated and recorded together in the LNAT. The HCA # 2 300-2 transmits an address information message including the L3 address information of the LA and the HCA # 2 300-2 to the mobile node 100, and simultaneously transmits the MICS 400 through the preset control channel. The mobile station 100 transmits a location registration message including the L2 address of the mobile node 100 and the L3 address information of the LA and HCA # 2 300-2 (step S420). The mobile node 100 receiving the address information message transmits a response message thereto to the HCA # 2 300-2 (step S440).

On the other hand, the MICS 400 has a location registration message received from the HCA # 2 (300-2) and the L2 address of the mobile node 100 present in GLMT, LA and L3 address information of the HCA # 2 (300-2) Update At this time, if there is a record for the mobile node 100 in the CNMT, the mobile node 100 transmits a location information delivery message including a list of all the PAs of the corresponding node and the L3 address of the HCA of the area in which the corresponding node is located. Transmit to HCA # 2 300-2 (step S430). In addition, the MICS 400 transmits a location information transmission message containing the PA of the mobile node 100 and the L3 address of the HCA # 2 300-2 to the HCAs in the area where all corresponding nodes communicating with the mobile node 100 are located. To transmit (step S435). HCAs receiving the location information transfer message from the MICS 400 update each CNAT. Thereafter, the HCA # 2 300-2 and the HCA # 3 300-3 perform tunneling based on the CNAT information updated when the data packet is delivered (step S445) (step S450) (step S455) (step S460). ).

5 is a block diagram of an HCA in accordance with the present invention.

As shown, the HCA # 1 300-1 includes a management unit 310 and a transmission / reception processing unit 320. The management unit 310 manages information related to the mobile node 100 connected to the AP # 1 200-1 of the access network and the corresponding node 500 connected to the AP # 2 200-2 of another access network. To manage the information associated with Specifically, the management unit 310 maintains and manages the L2 address of the mobile node 100, PA, LA, and interface information to the AP connected to the mobile node in the LNAT. In addition, the PA of the corresponding node, the L3 address of the HCA # 3 300-3 of the region where the corresponding node is located, and the tunnel interface information to the HCA # 3 300-3 of the region where the corresponding node 100 is located are maintained in the CNAT. Manage. At least some of the information managed in the LNAT and CNAT is obtained from the outside, as described above.

The transmission / reception processor 320 receives a data packet to be transmitted from the mobile node 100 to the corresponding node 500. The matching PA is then retrieved from the CNAT with the destination address of the corresponding node 500 included in the data packet. The HCA # is then encapsulated and tunneled with L3 address information of HCA # 2 300-2 mapped to the retrieved PA and tunnel interface information to HCA # 3 300-3 where the corresponding node 500 is located. Send a data packet to 3 (300-3). In addition, the transmission and reception processing unit 320 receives and decapsulates a data packet transmitted through the AP # 3 (200-3) and the HCA # 3 (300-3) from the corresponding node 500. The matching PA is then retrieved from the LNAT with the destination address of the received data packet. Next, the interface information to the AP # 1 (200-1) mapped to the retrieved PA is extracted, and the data packet is transferred to the AP # 1 (200-1) using the extracted interface information.

6 is a block diagram of MICS in accordance with the present invention.

As shown, the MICS 400 includes a central manager 410 and an information provider 420. The central management unit 410 manages location and communication state information for the nodes. In more detail, the central management unit 410 maps L2 address of the node, PA, LA, and L3 address information of the HCA of the region where the node is located and maintains and manages the GLMT. And as described above, these address information are provided from the HCAs. The information provider 420 searches for GLMT in response to a request from the HCA # 1 300-1 of the area where the mobile node 100 to communicate with the corresponding node 500 is located, and the area where the corresponding node 500 is located. L3 address information of HCA # 3 (300-3) of the HCA # 1 (300-1), the PA of the mobile node 100 connected to HCA # 1 and L3 address of HCA # 1 (300-1) Provide information to HCA # 3 300-3. The central management unit 410 records the communication connection between these two nodes in the CNMT.

If the mobile node 100 moves to another access network area while the mobile node 100 is in a communication state, the HCA # 2 300-2 of the new area moves to the L2 address, LA, and HCA # 2 (300-2) of the mobile node 100. ) L3 address information is transmitted to the MICS 400. The central management unit 410 of the MICS 400 updates the GLMT by receiving the L2 address of the mobile node 100, the L3 address information of the LA and the HCA # 2 300-2. In addition, the information providing unit 420 searches the CNMT to identify the corresponding node 500 in communication with the mobile node 100, and transmits the PA address of the mobile node 100 and the HCA # 2 300-300 to the corresponding node 500. L3 address information of 2) is transmitted. In addition, the information providing unit 420 transmits the PA of the corresponding node 500 and the L3 address information of the HCA # 3 300-3 of the region where the corresponding node is located to the HCA # 2 300-2.

So far I looked at the center of the preferred embodiment for the present invention. Those skilled in the art will appreciate that the present invention can be implemented in a modified form without departing from the essential features of the present invention. Therefore, the disclosed embodiments should be considered in descriptive sense only and not for purposes of limitation. The scope of the present invention is shown in the claims rather than the foregoing description, and all differences within the scope will be construed as being included in the present invention.

1 is a diagram illustrating an overall configuration of a network environment according to the present invention.

2 is a flowchart illustrating a location and address registration process of a mobile node according to the present invention.

3 is a flowchart illustrating a connection registration process and a tunneling process for data transmission and reception between two nodes according to the present invention.

4 is a flowchart illustrating a handover process according to movement of a node to a new access network area according to the present invention.

5 is a block diagram of a mobility support device according to the present invention.

6 is a block diagram of a management device according to the present invention.

7 is an exemplary table managed in the mobility management device according to the present invention.

8 is another exemplary table managed by the mobility management device according to the present invention.

9 is an exemplary table managed by the management device according to the present invention.

10 is another exemplary table managed by the management device according to the present invention.

Claims (20)

A method of supporting mobility for a mobile node performed by an access network-specific agent connecting an access network and an internet protocol core network integrating the access networks, the method comprising: An address information obtaining step of obtaining address information of a mobile node connected to the access point from an access point; A location registration step of registering the location of the mobile node by transmitting the obtained mobile node address information and the third layer address information of the agent to the management device managing the access networks located in the internet protocol core network; Transmitting agent address information of the agent to the mobile node so that the mobile node can transmit a data packet to the agent; And A packet transmission / reception processing step of processing data packet transmission and reception between the mobile node and the corresponding node in consideration of address information of the mobile node and information registered in the management apparatus; The mobility support method for a mobile node performed in an agent comprising a. The method of claim 1, wherein the obtaining of the address information comprises: Receiving layer 2 address information of the mobile node transmitted from the access point; And Receiving permanent address information of the mobile node returned from the mobile node as the third layer address information of the agent is transmitted to the mobile node; The mobility support method for a mobile node performed in an agent comprising a. The method of claim 2, wherein the location registration step is: Transmitting the received layer 2 address information of the mobile node and layer 3 address information of the agent to the management device; And Transmitting the received permanent address information of the mobile node to the management device; The mobility support method for a mobile node performed in an agent comprising a. The method of claim 2, The location registration step and the address information sending step further include transmitting three-layer address information valid in an access network area managed by the agent and temporarily assigned to the mobile node. How to support mobility. The method of claim 1, wherein the transmission and reception processing step: Receiving a data packet transmitted at the mobile node; Obtaining third layer address information of another agent managing a corresponding node having a destination address of the received data packet; Transmitting the received data packet to the other agent by using the obtained third layer address information of the other agent; The mobility support method for a mobile node performed in an agent comprising a. The method of claim 5, wherein the obtaining of the third layer address information of the other agent comprises: Requesting third layer address information of another agent to receive the data packet from the management device with destination address information of the received data packet; And Receiving address information of the other agent from the management device according to the request; The mobility support method for a mobile node performed in an agent comprising a. The method of claim 6, wherein the transmission and reception processing step: And buffering the received data packet until it is transmitted to the other agent. The method of claim 5, wherein the transmission and reception processing step: Receiving and encapsulating a data packet transmitted from the mobile node and transmitting the encapsulated data packet to the other agent, and receiving and decapsulating the data packet transmitted from the other agent and delivering the data packet to the mobile node. Of mobility support for mobile nodes performed on Linux. The method of claim 1, And the agent communicates with the management device through at least one preset control channel. 10. The method of claim 9, And if multi-protocol label switching is implemented in the internet protocol core network, the agent communicates using at least one label switch path as a control channel. A mobility support method for a node located in an internet protocol core network and performed by a management device that communicates with an agent for each access network that manages a node wirelessly connected to an access point. An information acquiring step of acquiring two-layer address information and permanent address information of the node connected to the access point and three-layer address information of the agent; A management step of mapping and managing the obtained address information; A message receiving step of receiving a request message for requesting three-layer address information of a receiving agent managing the corresponding node from a transmitting agent which is to transmit a data packet to a corresponding node; Retrieving three-layer address information of the receiving agent from the mapping-managed information in response to receiving the message; And A transmitting step of transmitting the retrieved layer 3 address information of the receiving agent to the transmitting agent; The mobility support method for a node performed in the management device comprising a. The method of claim 11, The request message includes source address and destination address information of the data packet, The search step is: Retrieving permanent address information that matches the destination address; Retrieving three-layer address information of an agent mapped to the retrieved permanent address; The mobility support method for a node performed in the management device comprising a. The method of claim 12, Retrieving permanent address information corresponding to the source address and location information of an agent mapped thereto from the mapping-managed information upon receipt of the request message; And Transmitting, to the receiving agent, the permanent address information corresponding to the retrieved source address and the third layer address information of the agent mapped thereto; The mobility support method for a node performed in the management device further comprising. A mobility support method for a node located in an internet protocol core network and performed by a management device that communicates with an agent for each access network that manages a node wirelessly connected to an access point. An information receiving step of receiving layer 2 address information for location registration of a node connected to the access point and layer 3 address information of the agent; Updating, by the received information, a table in which two-layer and permanent addresses of nodes and three-layer address information of an agent managing the node are mapped and stored; And An information transmitting step of transmitting, to the mobile node, permanent addresses of all corresponding nodes in communication with the mobile node and layer 3 address information of an agent mapped thereto; The mobility support method for a node performed in the management device comprising a. The method of claim 14, Transmitting the permanent address of the mobile node and layer 3 address information of an agent mapped thereto to all corresponding nodes in communication with the mobile node; The mobility support method for a node performed in the management device further comprising. A method of supporting mobility for a mobile node performed at an access point communicating with an agent connecting an access network and an internet protocol core network, Establishing a wireless channel with the mobile node; Acquiring layer 2 address information of the mobile node in the radio channel formation process; And Transmitting second layer address information of the secured mobile node to the agent that is to perform location registration of the mobile node instead of the mobile node; The mobility support method for a mobile node performed at an access point comprising a. delete A mobility support apparatus for an access network for each access network connecting an access network and an internet protocol core network integrating the access networks, the apparatus comprising: A management unit managing information related to the mobile node connected to the access point, and managing information related to the corresponding node connected to the access point of another access network; And A transmission and reception processing unit for processing data packet transmission and reception between a mobile node and a corresponding node with information managed by the management unit; The management unit maps and manages two-layer address information of the mobile node and interface information to an access point connected to the mobile node, and maps and manages three-layer address information of the mobility support apparatus managing the corresponding node. Mobility support device. A management apparatus located in an internet protocol core network and capable of communicating with an agent for each access network that manages a node wirelessly connected to an access point, A central management unit that manages persistent address information of nodes connected to an access point and three-layer address information of an agent managing the node, and manages a communication connection state between the nodes; And In response to a request of an agent managing a mobile node that attempts to communicate with a corresponding node, the server returns the permanent address information of the corresponding node managed by the central management unit and three-layer address information of the agent managing the corresponding node, and returns the central node. An information providing unit for returning the permanent address information of the mobile node managed by the management unit and the third layer address information of the agent managing the mobile node to the corresponding node; Management apparatus comprising a. The method of claim 19, The information providing unit may include a permanent address of at least one corresponding node designated in a communication connection state with the mobile node managed by the central management unit according to a request of an agent newly managing the mobile node by handover of the mobile node. Returning the information and the third layer address information of the agent managing the corresponding node, and transmitting the permanent address information of the mobile node and the third layer address information of the agent newly managing the mobile node to the at least one corresponding node. Characterized in that the management device.

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