KR100933368B1 - Network-based Mobile IPv6 Supporting Device and Method - Google Patents

Abstract

The present invention relates to a mobile network, and more particularly, to a network-based Mobile IPv6 supporting apparatus and method for providing mobility of an IPv6 (Internet Protocol version 6) terminal in a network, wherein the home address of a mobile node is provided to a device such as an access router. A home address setting unit for receiving and registering in the routing table, a binding update list in which the transmitted binding information is registered, a binding update message is transmitted to an external device, and the binding information is registered in the binding update list according to the response result. A binding register for removing the header of the packet received from the external device and forwarding the packet to the mobile node or forwarding the packet transmitted from the mobile node to the counterpart node or the home agent, depending on whether the destination address is registered with the binding information. MIPv6 stack by including; There is an effect that it is possible to provide mobility to the general IPv6 terminal is not mounted.

Description

Apparatus and Method for Netowrk based Mobile IPv6}

The present invention relates to a mobile network, and more particularly, to a network-based Mobile IPv6 supporting apparatus and method for providing mobility of an IPv6 terminal in a network.

The present invention is derived from a study conducted as part of the IT growth engine technology development project of the Ministry of Information and Communication and the Ministry of Information and Communication Research and Development. [Task Management No.:2006-S-061-02, Title: IPv6 based QoS service and Terminal mobility support router technology development].

Mobile IPv6 (MIPv6) is a technology that provides mobility while using IPv6 functions. Mobile IPv6 (MNv) is used by neighbor discovery and address auto-configuration. When moving, it automatically configures its own location information, and a new moving header (called Home Agent (HA)) or a correspondent node (Correspondent Node: CN) to notify the moved location information. Mobility Header) is defined to provide Route Optimization.

Referring to FIG. 1, when the mobile node 110 moves from the home network (network A) to the outside (network B), the mobile node 110 is assisted by automatic address setting in addition to the home address (HoA). It has an address (called Care of Address: CoA). The binding of HoA and CoA addresses of the mobile node 110 is called a binding. The mobile node 110 requests 112 to register its CoA address with the home agent 130 to update the binding. Perform Accordingly, the home agent 130 responds to the mobile node 110 with the binding acknowledgment (Binding Acknowledgement) 113, the binding registration process is performed. Thereafter, the home agent 130 tunnels and delivers all IPv6 packets designated as HoA addresses of the mobile node 110 to the CoA address of the mobile node 110.

When the mobile node 110 receives the first packet transmitted from the counterpart node 140 for path optimization, the mobile node 110 also transmits a binding update to the counterpart node 140 and receives a binding acknowledgment. When the binding registration is made according to the request of the mobile node 110, the partner node 140 checks the stored binding information and directly transmits the packet to the mobile node 110 via the CoA address.

In order to implement the mobile IPv6 (MIPv6) technology as described above, the mobile IPv6 stack must be mounted on the terminal, and the mobile node must perform both the CoA address setting for providing mobility and the binding registration request to the home agent. . In addition, path optimization is supported only between terminals supporting MIPv6. If path optimization is not supported, data is transferred to the mobile node through tunneling between the home agent and the mobile node.

Therefore, MIPv6 requires many functions in the mobile node to provide mobility, and in order to support path optimization, the other node must also support MIPv6. In addition, in the Next Generation Network (NGN) environment, various types of terminals require different services between heterogeneous networks. Therefore, small terminals cannot easily be equipped with complex functions such as MIPv6. Therefore, all terminals can support MIPv6. none. Therefore, in order to provide various services required between heterogeneous terminals, there is a need for a method capable of ensuring mobility between terminals not supporting MIPv6 in a network and improving service quality through path optimization.

In order to solve the above problems, a method of performing binding registration and packet transmission on behalf of a mobile node in a network is required. Accordingly, the present invention provides a network-based MIPv6 support apparatus and method that can perform binding registration to a home agent or a device connected to a partner in a network-based device to which a mobile node is connected, and deliver packets transmitted from the partner node to the mobile node. For the purpose.

In addition, another object of the present invention is to provide a network-based MIPv6 support apparatus and method capable of supporting MIPv6 functions without mounting a separate MIPv6 stack in the mobile node to provide IPv6 mobility,

Furthermore, another object of the present invention is to perform binding optimization using a stored binding cache by performing binding registration between an access router connected to a mobile node and a counterpart node as well as binding registration between an access router and a home agent. The present invention provides an access router capable of doing this, and a method of supporting MIPv6 executable on the router.

The present invention for achieving the above object,

A home address setting unit which receives a home address of the mobile node and registers it in a routing table;

A binding update list in which the sent binding information is registered;

A binding register for transmitting a binding update message to an external device and registering binding information in the binding update list according to the answer result;

A packet processor which removes a header of a packet received from an external device and delivers it to a mobile node, or delivers a packet transmitted from the mobile node to a counterpart node or to a home agent according to whether binding information of a destination address is registered. It features.

According to this problem solving means, a network-based device to which a mobile node is connected, for example, a device such as an access router, performs binding registration with a home agent or a device to which a partner node is connected, and forwards packets transmitted from the partner node to the mobile node. This eliminates the need for a separate stack for MIPv6 support on the mobile node.

MIPv6 support apparatus according to another embodiment of the present invention,

A home address setting unit which receives a home address of the mobile node and registers it in a routing table;

A binding update list in which the sent binding information is registered;

A binding cache in which the received binding information is registered;

A binding register for exchanging a binding update message with an external device and registering binding information in the binding update list and a binding cache according to a result of the transmission and reception of a message responding to the binding update message;

A packet processing unit which removes a header of a packet received from an external device and delivers it to a mobile node, or delivers a packet transmitted from the mobile node to a counterpart node or a home agent according to whether binding information of a destination address is registered. It features.

According to this problem solving means, in addition to performing registration of binding to a home agent or a device to which a partner node is connected in a network-based device to which a mobile node is connected, for example, an access router, an access router connected to the partner node. It is possible to register and manage the binding information of the partner node according to the request of.

According to the problem solving means described above, since the mobile terminal supports the MIPv6 function without additional protocol in a network-based device, for example, an access router, such as an access router, the general IPv6 without the MIPv6 stack There is an effect that can provide mobility to the terminal,

Furthermore, the present invention solves the problem of providing route optimization only between MIPv6-supporting terminals, thereby ensuring a route optimization among general IPv6 terminals, thereby improving the quality of service.

In addition, the present invention does not require the home address option of the IPv6 routing type 2 header and the destination option header added for packet transmission during route optimization in MIPv6, and provides access optimization using only the extension header provided by IPv6 in the access router. A side effect can also be obtained.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the following description of the present invention, if it is determined that a detailed description of related known functions or configurations may unnecessarily obscure the subject matter of the present invention, the detailed description thereof will be omitted. For reference, an embodiment of the present invention is based on an access router system in an IPv6 (Internet Protocol Version 6) network environment, and can use an IP layer without any additional message or address definition by using various addresses and extension headers of IPv6. have. An apparatus and method for supporting such a network-based MIPv6 function will be described with an access router as an example.

2 is a block diagram of an access router apparatus supporting network-based Mobile IPv6 according to an embodiment of the present invention.

First, in order to provide mobility to a general IPv6 terminal that does not support MIPv6, the access router device of the present invention performs binding registration when connected to a mobile node, and performs MIPv6 packet processing function instead of the mobile node for path optimization. When connected to the partner node, MIPv6 packet processing function is provided instead of the partner node.

To this end, the access router device 150 according to an embodiment of the present invention includes a home address setting unit 152 that receives a home address HoA of the mobile node 110 and registers it in a routing table as shown in FIG. 2. In addition, the binding update list 156 in which the transmitted binding information is registered is transmitted, and the binding update message is transmitted to an external device such as the home agent 130 and the access router on the counter node side. Binding registration unit 154 for registering binding information to the mobile node 110 by removing the header of the packet received from the external device, or forwarding the packet transmitted from the mobile node 110 to the destination address. The packet processing unit 160 delivers the packet to the counterpart node directly or to the home agent 130 depending on whether it is registered.

 Of course, since the partner node may be a fixed node or a mobile node, the access router 150 may register the binding information in the binding cache 158 according to the binding update request from the partner node. .

Hereinafter, the operation of the binding register 154 of the access router will be described in detail with reference to FIG. 3, which illustrates a home address (HoA) setting and binding registration process in the access router 150.

Referring to FIG. 3, first, when a mobile node first connects to the network, it informs the access router 150 of its home address HoA using a neighbor advertisement message (211). When the HoA address of the mobile node 110 is received 211 from the mobile node, the HoA setting unit 152 of the router adds it to its routing table, thereby forwarding the packet received to the mobile node to the mobile node. The routing information is used only to communicate with the mobile node without passing it on to other routers.

As described above, when the HoA is received, the HoA setting unit 152 requests the binding registration unit 212 to the binding registration unit 154. Accordingly, the binding register 154 sets its own address to the mobile node's secondary address (CoA) to transmit a binding update message (BU) to the home agent 130 (213), and the binding confirmation message from the home agent 130. When (BA) is received (218), the binding information is additionally registered (214) in the binding update list (BUL). The home agent 130 address may be notified by the mobile node 110 or may be obtained using a dynamic home agent address discovery mechanism.

In addition, the binding register 154 receives (A) the first packet from the partner node to provide path optimization, or when the node moves and newly connects while the path optimization is performed, the binding update list (BUL) from the previous access router. Receive (B). For reference, the previous access router address can be obtained from the mobile node.

If the binding update list is received while receiving the first packet from the partner node or the path optimization is performed, the binding register 154 sends the binding update message (BU) to the access router connected to the partner node to transmit the subnet-router anycast address. Or a binding update message (BU) is transmitted to the counterpart nodes in the binding update list (215). The access router on the counterpart node side receiving the binding update message BU (C) adds binding information to the binding cache (D) and transmits (E) the binding confirmation message BA. As a result, the access router 150 connected to the mobile node receives the binding acknowledgment message BA (step 217) and adds it to the binding update list BUL (214) to complete the binding registration for path optimization.

4 and 5 briefly illustrate the flow of messages transmitted and received for home address (HoA) setting and binding registration as described above.

FIG. 4 illustrates a message flow for setting a home address (HoA) of a mobile node and performing binding registration in an access router according to an embodiment of the present invention, and FIG. 5 illustrates a path in an access router according to an embodiment of the present invention. The message flow for optimization is shown.

Referring first to FIG. 4, the mobile node 110 first forwards 211 its address information to the access router 150 when it first connects to the network. Upon receiving HoA address information of the mobile node 110, the access router 150 transmits 213 binding information in the form of a binding update message whose binding address is the secondary address (CoA) of the mobile node 110. The home agent 130 stores the binding cache in the same manner as MIPv6 and responds with a binding confirmation 218. This completes the binding registration.

As such, when the binding registration is completed, the counterpart node 140 may transmit 220 a packet to the HoA address of the mobile node 110. The transmitted packet is then tunneled 221 to the access router 150 on the mobile node 110 side by the home agent 130 and forwarded. When the access router 150 of the mobile node 110 receives the packet, the packet processor 160 deletes the tunneling header and forwards the received packet to the mobile node 110 (222). Therefore, the general IPv6 terminal without the MIPv6 stack can also use the service by supporting MIPv6 in the mobile network.

Meanwhile, referring to FIG. 5, a message flow for optimizing a path is described. First, when an access router 150 connected to a mobile node 110 receives a first packet from a counterpart node with respect to the mobile node 110 connected thereto, In operation 215, the binding update message is transmitted to the access router to which the other node is connected using the subnet-router anycast address. When the access router connected to the partner node receives the binding update message (C), the access router stores the binding update message in the binding cache (D) and responds with a binding confirmation message (BA) (217). Then, the access router 150 to which the mobile node 110 is connected completes binding registration by receiving a binding confirmation message (217).

After the registration of the binding is completed, when the partner node 140 transmits a packet (231), the access router on the partner node 140 looks up the binding cache and adds a routing header if binding information exists to add the secondary address of the mobile node. The packet is transmitted to the mobile node via CoA. Since the secondary node CoA of the mobile node is an access router address to which the mobile node 110 is connected, the packet is transmitted 233 to the access router 150 of the mobile node 110. When the access router 150 to which the mobile node 110 is connected receives the packet (233), the HoA address of the mobile node in the routing header is set as the destination address and the routing header is removed in the same manner as the IPv6 routing header. 110).

Therefore, route optimization can be guaranteed even between general IPv6 terminals not equipped with a MIPv6 stack.

Hereinafter, a packet processing process of the packet processor 160 illustrated in FIG. 2 will be described in detail with reference to FIG. 6.

Referring to FIG. 6, when the access router 150 of the mobile node 110 receives 221 a packet that is tunneled from the home agent 130, the tunneling header is removed (F) and the mobile node 110 is removed. Forwards the packet to the packet.

If the mobile node 110 transmits a packet, the packet processor 160 first checks whether a destination node, which is a destination address, exists in the binding update list BUL when the packet is received from the mobile node 110 (241). 242). If it exists in the binding update list (BUL), path optimization is performed and the received packet is transmitted to the counterpart node as it is (244). However, if the destination address does not exist in the binding update list (BUL), the tunneling header is added (G) so that the packet is delivered to the counterpart node via the home agent 130 (243).

On the other hand, in the case of an access router connected to the counterpart node 140, when a packet is received from the counterpart node 231, the binding header is looked up 232 to check the binding cache, and the routing header is only present if the binding information for path optimization exists. (H) is added to forward the packet to the mobile node 110 directly without passing through the home agent (233).

7 illustrates the values of packets and routing headers transmitted between network elements according to the operation of the packet processor 160. In FIG. 7, Src represents a destination, Dst represents a destination, and CN and MN represent a counter node and a mobile node, respectively. RH represents a routing header and AR represents an access router.

Referring to FIG. 7, when the packet 311 transmitted from the partner node 140 is transmitted to the access router 150 of the mobile node 110 via the home agent 130, the home agent 130 is transmitted. ) Forwards the packet through tunneling 221 to the access router 150, which is the secondary address (CoA) of the mobile node 110. Accordingly, the header 312 destined for the mobile node 110 access router 150 address is transmitted to the packet received from the counterpart node 140 as the destination, and the address of the access agent 150 of the mobile node 110 is transmitted. . Upon receipt of the tunneled packet, the access router 150 removes the added header and forwards the packet to the mobile node (222).

When the mobile node 110 transmits the packet 313 from the mobile node 110 to the counterpart node 241, the connected access router 150 confirms that the mobile node 110 is registered with the mobile node 110, and there is no counterpart node that is the destination address in the binding update list. Tunnels 243 to the home agent and forwards the packet. The source of the header 314 added for tunneling is the address of the mobile node 110 side access router 150, and the destination address is the home agent 130 address. In this case, the home agent 130 removes the tunneling header and forwards the packet to the counterpart node 140.

On the other hand, when the access router 150 performs the path optimization and has the binding cache information in the access router 150 connected to the counterpart node 140, when the access router 150 receives the packet 321 transmitted by the counterpart node 231, the binding cache information is received. A lookup is performed to add a routing header 322 to forward the packet via the mobile node's secondary address (CoA). The HoA address of the mobile node 110 is added to the routing header 322, and the destination address sets the access router address of the mobile node 110 to transmit the packet 323. The transmitted packet is delivered to the access router 150 connected to the mobile node 110, and the mobile node 110 performs the routing header process to forward the packet to the mobile node 110 (235). . In the case of transmitting a packet from the mobile node to the counterpart node 241, the process is the same as the normal packet transmission 244.

As described above, since the present invention supports the MIPv6 function without additional protocol in the network-based access router, it is possible to obtain the effect of providing mobility to general IPv6 terminals not equipped with the MIPv6 stack.

In addition, the present invention solves the problem of providing the path optimization between MIPv6 support terminals only, it is possible to obtain the effect of improving the quality of the service by ensuring the path optimization between the general IPv6 terminal.

Furthermore, the present invention does not require the home address option of the IPv6 routing type 2 header and the destination option header added for packet transmission when optimizing the route in MIPv6, and provides the route optimization using only the extension header provided by IPv6 in the access router. You can also get side effects.

On the other hand, the above embodiment has been described as to support the MIPv6 function in the access router, the method of the present invention can be implemented in a computer-readable program code in a computer-readable recording medium. Computer-readable recording media include all types of recording devices that store data that can be read by a computer system. Examples of computer-readable recording media include ROM, RAM, CD-ROM, magnetic tape, Floppy disks, optical data storage, and the like, and also include those implemented in the form of carrier waves (eg, transmission over the Internet). The computer-readable recording medium can also be distributed over network coupled computer systems so that the computer readable recording medium can be accessed and executed from the network-connectable computer.

Therefore, those skilled in the art will understand that various modifications and equivalent other embodiments are possible from the embodiments of the present invention. Therefore, the true technical protection scope of the present invention will be defined by the technical spirit of the appended claims.

1 is a diagram for explaining Mobile IPv6 operation.

2 is a block diagram of an access router apparatus supporting network-based Mobile IPv6 according to an embodiment of the present invention.

3 is a view for explaining a home address (HoA) setting and binding registration process in the access router shown in FIG.

4 is a message flow diagram for setting a home address (HoA) and binding registration of a mobile node in an access router according to an embodiment of the present invention.

5 is a message flow diagram for path optimization in an access router according to an embodiment of the present invention.

FIG. 6 is a diagram for describing a packet processing process of the packet processing unit 160 shown in FIG. 2.

FIG. 7 illustrates a packet transmitted between network elements associated with an access router according to an embodiment of the present invention. FIG.

Claims (17)

A home address setting unit which receives a home address of the mobile node and registers it in a routing table; A binding update list in which the sent binding information is registered; A binding register for transmitting a binding update message to an external device and registering binding information in the binding update list according to the answer result; A packet processing unit which removes a header of a packet received from an external device and delivers it to a mobile node, or delivers a packet transmitted from the mobile node to a counterpart node or a home agent according to whether binding information of a destination address is registered. Network based Mobile IPv6 support device characterized in that. The network-based Mobile IPv6 supporting apparatus of claim 1, wherein the home address setting unit registers and registers the address of the supporting apparatus itself as an auxiliary address (CoA) of the mobile node. The apparatus of claim 1, wherein the binding registration unit transmits a binding update message using a subnet-router anycast address to an access router connected to a counterpart node. The method according to claim 1, wherein the packet processing unit, A network-based Mobile IPv6 supporting apparatus for transmitting a packet by adding a turning header having a destination as a home agent and a destination as its own address when the packet is delivered to the home agent. The method according to claim 1, wherein the packet processing unit, If the external device is a partner node, the network-based MIPv6 supporting apparatus removes a routing header added to a packet received from the external node and processes the home address of the mobile node added to the routing header as a destination address. . The network-based mobile IPv6 supporting apparatus according to any one of claims 1 to 5, wherein the supporting apparatus is an access router. A home address setting unit which receives a home address of the mobile node and registers it in a routing table; A binding update list in which the sent binding information is registered; A binding cache in which the received binding information is registered; A binding register for exchanging a binding update message with an external device and registering binding information in the binding update list and a binding cache according to a result of the transmission and reception of a message responding to the binding update message; A packet processing unit which removes a header of a packet received from an external device and delivers it to a mobile node, or delivers a packet transmitted from the mobile node to a counterpart node or a home agent according to whether binding information of a destination address is registered. Network based Mobile IPv6 support device characterized in that. The network-based Mobile IPv6 supporting apparatus of claim 7, wherein the home address setting unit registers and registers the address of the supporting apparatus as an auxiliary address (CoA) of the mobile node. The apparatus of claim 7, wherein the binding registration unit transmits a binding update message using a subnet-router anycast address to an access router connected to a counterpart node. The method according to claim 7, wherein the packet processing unit, A network-based Mobile IPv6 supporting apparatus for transmitting a packet by adding a turning header having a destination as a home agent and a destination as its own address when the packet is delivered to the home agent. The method according to claim 7, wherein the packet processing unit, If the external device is a partner node, the network-based MIPv6 supporting device removes a routing header added to a packet received from the external node, and processes the mobile node's home address added to the routing header as a destination address and transmits the packet. . The network-based mobile IPv6 supporting apparatus according to any one of claims 7 to 11, wherein the supporting apparatus is an access router. In the mobile IPv6 support method that can be executed in a device that can connect to the mobile node, Receiving a home address of the mobile node and registering it in a routing table; Transmitting the binding update message to the home agent of the mobile node and registering the binding information in the binding update list according to a result of receiving the response message; Transmitting a packet to a mobile node after removing a tunnel header when receiving a packet through tunneling from a home agent; And transmitting the packet transmitted from the mobile node to the device connected to the home agent or the counterpart node according to whether the binding information of the destination address is registered. The method of claim 13, further comprising: transmitting a binding update message to a device connected to the counterpart node upon receiving a first packet from the counterpart node and registering the binding information in the binding update list according to a message reception result. Network based mobile IPv6 support method characterized in that. 15. The method of claim 13 or 14, further comprising: registering binding information in a binding cache and transmitting a binding confirmation message when receiving a binding update message from a counterpart node; And removing the routing header of the packet received from the partner node and transmitting the packet using the address of the mobile node included in the routing header as a destination address. The method according to claim 13 or 14, wherein the address of the device on which the method is executed is bound to a secondary address of a mobile node. The method according to claim 13 or 14, wherein the routing header added when transmitting a packet to a device connected to a counterpart node uses a routing header defined in IPv6.

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