KR100882429B1 - Regional care-of address auto configuration method for mobile terminal based on hierarchical mobile IPv6 - Google Patents

Abstract

1. TECHNICAL FIELD OF THE INVENTION

The present invention relates to a method for automatically setting a local temporary address of a terminal in a hierarchical mobile Internet protocol network and a computer-readable recording medium having recorded thereon a program for realizing the method.

2. The technical problem to be solved by the invention

According to the present invention, a local temporary address (RCoA) and a link temporary address (LCoA) of a terminal are stored in a hierarchical mobile internet protocol (HMIPv6) network for mobile terminal mobility management in a mobile anchor point (MAP). By realizing the DAD (Duplicate Address Detection) process, which is an essential process for automatic allocation of temporary addresses (RCoA), a method for automatically setting a local temporary address of a terminal and reducing the delay of an address generation time is realized. The aim is to provide a computer readable recording medium having recorded thereon a program for the purpose of recording the program.

3. Summary of Solution to Invention

The present invention provides a method for automatically setting a local temporary address of a terminal in a hierarchical mobile internet protocol network, wherein the local temporary address (RCoA) and a link temporary address (LCoA) are included in a binding cache for mobility management of a mobile terminal in a mobile anchor point domain. Mapping and managing c); When a mobile terminal transmits a local binding update (Local BU) message to check whether local temporary addresses generated by using prefix information of a mobile anchor point (MAP) are duplicated, the mobile anchor point based on the binding cache. Checking whether the address is a duplicate; And checking, by the mobile anchor point, a binding acknowledgment (BA) message to the one mobile terminal according to whether the local temporary address is uniquely used in the corresponding subnet.

4. Important uses of the invention

The present invention is used for hierarchical mobile internet protocol version 6 (HMIP) and the like.

HMIPv6, Local Temporary Address (RCoA), Link Temporary Address (LCoA), Mobile Anchor Point (MAP), Subnet

Description

Regional care-of address auto configuration method for mobile terminal based on hierarchical mobile IPv6}

1 is a diagram illustrating an embodiment of a general hierarchical mobile internet protocol network;

2 is a diagram illustrating an embodiment of a method for automatically setting a local temporary address of a terminal in a hierarchical mobile internet protocol network according to the present invention;

3 is a flowchart illustrating a method for automatically setting a local temporary address of a terminal in a hierarchical mobile internet protocol network according to the present invention.

* Explanation of symbols on the main parts of the drawing

10,20: mobile terminal (MN) 30,40: access router (AR)

50: moving anchor point (MAP) 60: binding cache

70 home agent (HA) 80 correspondence terminal (CN)

The present invention relates to a method for automatically setting a local temporary address of a terminal in a hierarchical mobile internet protocol network, and to a computer-readable recording medium recording a program for realizing the method. HMIPv6: Regional Care-of-Address (RCoA) and Link Temporary Address (LCoA :) for managing mobility of UE in Mobile Anchor Point (MAP) in Hierarchical Mobile Internet Protocol version 6) network By saving On Link CoA), DAD (Duplicate Address Detection) process, which is an essential process for automatic allocation of Local Temporal Address (RCoA), can be performed quickly, thus saving resources and reducing the delay of address generation time. A computer readable recording medium recording a local temporary address of a terminal and a program for realizing the method. It is about.

First, terms used in the present invention are defined as follows.

Home address (HoA) is an address used to uniquely distinguish each mobile station (MN) in Mobile Internet Protocol (Mobile IP).

The care-of address (CoA) is an address that contains the location information of the mobile terminal (MN) in Mobile Internet Protocol (Mobile IP).

The Local Temporary Address (RCoA) is an IPv6 address on a subnet of a Mobile Anchor Point (MAP) that is automatically configured by using corresponding network information in a network visited by a mobile terminal (MN).

The link temporary address (LCoA) is an address configured by a mobile station (MN) using a prefix received from its access router (AR).

Duplicate Address Detection (DAD) is a process of checking whether an address of a neighboring node collides with the generated RCoA. Strictly, the mobile terminal (MN) is a procedure of broadcasting a packet for address duplication to all nodes on the same subnet.

Then, for better understanding, the basic concept of a general hierarchical mobile internet protocol (HMIPv6) network will be described with reference to FIG. 1.

In the Mobile IP network, whenever a mobile station (MN) 10 moves through a subnet, the home agent (HA) is transmitted to the home agent (HA) via the Internet. Since a number of mobile terminals (MN) 10 exists, the load on the core internet becomes large. Thus, in order to solve this problem, the 'Hierarchical Mobile Internet Protocol (HMIP)' has been proposed. Here, the home agent (HA) 70 is a device that manages the home address HoA of the mobile terminal (MN) 10.

The hierarchical mobile internet protocol (HMIP) solves the above problem by differently handling local and global movement of the mobile terminal (MN) 10.

In addition, the hierarchical mobile internet protocol (HMIP) introduces an agent called a mobile anchor point (MAP) 50 as an anchor point for handling local movement. Here, the mobile anchor point (MAP) 50 is located in a network visited by the mobile terminal (MN) 10 and is used as a local home agent (Local HA) of the mobile terminal (MN) 10. The area serviced by the mobile anchor point (MAP) 50 consists of an area serviced by a plurality of access routers (ARs) 30 and 40. In addition, the access routers (AR) 30 and 40 are default routers of the mobile terminal (MN) 10 which collects the traffic of the mobile terminal (MN) 10 and delivers them to the mobile anchor point (MAP) 50.

If the mobile station (MN) 10 arrives in the area of the new mobile anchor point (MAP) 50, it generates two temporary addresses (CoA), one corresponding mobile anchor point domain (MAP Domain) Local Temporary Address (RCoA) that contains information, and the other is the Link Temporary Address (LCoA) that contains information about the subnet (subnet) managed by the corresponding access router (AR) (30, 40). After creating two temporary addresses (CoA), Local Temporal Address (RCoA) and Link Temporary Address (LCoA), the pair of (RCoA, LCoA) is registered in the corresponding Mobile Anchor Point (MAP) 50 and (HoA). , RCoA) is registered in the home agent (HA) 70. By managing the location information in such a layer, if the mobile station (MN) 10 moves to another subnet in the mobile anchor point domain, the local temporary address (RCoA) does not change. Since only the link temporary address (LCoA) changes, the mobile terminal (MN) 10 registers the location by registering only the local temporary address (RCoA) and the newly obtained link temporary address (LCoA) with the mobile anchor point (MAP) 50. You can finish. As a result, when the mobile terminal (MN) 10 moves in a mobile anchor point domain (MAP Domain), it is not necessary to perform a binding update (BU: BU) to the home agent (HA) 70 via the Internet. This can reduce the load on the network.

As such, when the mobile terminal (MN) 10 moves to a new mobile anchor point domain (MAP Domain) and the mobile anchor point (MAP) 50 is changed, the mobile terminal (MN) 10 generates two CoAs. do. As mentioned above, one is the RCoA used on the link of the MAP and the other is the LCoA applied to the outer link.

Thereafter, the mobile terminal (MN) 10 generating the RCoA based on the information of the prefix sent from the mobile anchor point (MAP) 50 sends the local binding update (Local BU) information to the mobile anchor point (MAP) 50. Send it. At this time, LCoA is used as the source address of the BU. In this process, the mobile anchor point (MAP) 50 binds the RCoA and the LCoA of the mobile terminal (MN) 10.

However, the mobile terminal (MN) 10 generates a local temporary address (RCoA) based on the information of the prefix sent from the mobile anchor point (MAP) (50) in order to check whether or not the duplicate address of the generated RCoA, All mobile terminals (neighbor node) (MN) belonging to the mobile anchor point (MAP) (50) has to send a packet asking whether the address is duplicate (broadcasting). That is, in generating a local temporary address (RCoA), the mobile station (MN) 10 broadcasts a packet asking whether the address overlaps to all nodes on the same subnet in order to confirm whether the address overlaps with a neighboring node. In response to the result from each node, it decides whether to use the address. However, in this process, a lot of radio resources are consumed, and there is a problem that it takes a long time (RCoA address generation time delay).

That is, in an HMIPv6 network composed of mobile anchor points (MAPs) 50 serving multiple access routers (ARs) 30, 40, the mobile terminal (MN) 10 moves to check for overlapping RCoAs. All mobile terminals (neighbor node) (MN) belonging to the anchor point (MAP) (50) must send (broadcasting) a packet for checking whether the address is duplicated and wait for the response. As described above, when using the hierarchical MIPv6 protocol, the mobile terminal (MN) 10 generates an RCoA by itself using an automatic address allocation scheme, and then checks whether the generated address collides with an address of a neighbor node (DAD process). However, the mobile station (MN) 10 on the wireless network consumes a lot of radio resources during the DAD process, and the mobile station (MN) 10 until the mobile station (MN) 10 receives confirmation of duplication from all neighboring nodes. There may be a time delay to wait.

The present invention has been proposed to solve the above problems, the local temporary address (RCoA) and the link temporary address (LCoA) of the terminal for mobility management of the terminal in the mobile anchor point (MAP) in the hierarchical mobile Internet Protocol (HMIPv6) network ), By performing the DAD (Duplicate Address Detection) process, which is an essential process when automatically assigning local temporary address (RCoA), to save resources and reduce the delay of address generation time. It is an object of the present invention to provide a method for automatically setting a temporary address and a computer-readable recording medium having recorded thereon a program for realizing the method.

Other objects and advantages of the present invention can be understood by the following description, and will be more clearly understood by the embodiments of the present invention. Also, it will be readily appreciated that the objects and advantages of the present invention may be realized by the means and combinations thereof indicated in the claims.

In order to achieve the above object, the present invention provides a method for automatically setting a local temporary address of a terminal in a hierarchical mobile internet protocol network, wherein the local temporary address (RCoA) is added to a binding cache for mobility management of a mobile terminal in a mobile anchor point domain. Mapping and managing a link temporary address (LCoA); When a mobile terminal transmits a local binding update (Local BU) message to check whether local temporary addresses generated by using prefix information of a mobile anchor point (MAP) are duplicated, the mobile anchor point based on the binding cache. Checking whether the address is a duplicate; And indicating that the mobile anchor point transmits a binding acknowledgment (BA) message to the one mobile terminal according to whether the local temporary address is uniquely used in the corresponding subnet. It is done.

Here, after generating the local temporary address, the mobile terminal broadcasts a packet inquiring whether all of the neighboring nodes (other mobile terminals) belonging to the mobile anchor point are duplicate addresses, and responds to the result from the neighboring node. Instead of determining whether to use the address, it is characterized in that the mobile anchor point checks whether the local temporary address is duplicated.

On the other hand, the present invention, the local temporary address in the hierarchical mobile Internet protocol network for the automatic setting of the local temporary address of the terminal, the local temporary address in the binding cache for the mobility management of the mobile terminal in the mobile anchor point domain in the address assignment system having a processor Mapping and managing (RCoA) and link temporary address (LCoA); When a mobile terminal transmits a local binding update (Local BU) message to check whether local temporary addresses generated by using prefix information of a mobile anchor point (MAP) are duplicated, the mobile anchor point based on the binding cache. The ability to check for duplicate addresses; And a program for realizing a function of informing a binding result by transmitting a binding acknowledgment (BA) message to the mobile terminal according to whether the local temporary address is uniquely used in the corresponding subnet as a result of the checking. Provide a computer readable recording medium having recorded thereon.

The above objects, features and advantages will become more apparent from the following detailed description taken in conjunction with the accompanying drawings, whereby those skilled in the art may easily implement the technical idea of the present invention. There will be. In addition, in describing the present invention, when it is determined that the detailed description of the known technology related to the present invention may unnecessarily obscure the gist of the present invention, the detailed description thereof will be omitted. Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

FIG. 2 is an exemplary diagram illustrating a method for automatically setting a local temporary address of a terminal in a hierarchical mobile internet protocol network according to the present invention. FIG. 2 illustrates a process of automatically setting a RCoA address of a terminal in a hierarchical MIPv6.

As described above, in the hierarchical mobile internet protocol (HMIP), when the mobile terminal (MN) 10 arrives in the area of the new mobile anchor point (MAP) 50, it generates two temporary addresses (CoA), One is a Local Temporary Address (RCoA) that contains information about the corresponding Mobile Anchor Point Domain (MAP Domain), and the other is for a subnet managed by the corresponding Access Router (AR) 30,40. Link temporary address (LCoA) that contains information. In this way, two temporary addresses (CoA), a local temporary address (RCoA) and a link temporary address (LCoA) are generated, and then a pair of (RCoA, LCoA) is bound to the binding anchor (MAP) 50 of the mobile anchor point (60). ) And a pair of (HoA, RCoA) to the home agent (HA) 70.

Thus, if the mobile terminal (MN) 10 moves to a different subnet in the mobile anchor point domain (e.g., in the area of access router 1 (AR1) 30) When moving to the area of router 2 (AR2) 40), since the local temporary address (RCoA) is not changed, only the link temporary address (LCoA) is changed, the mobile terminal (MN) 20 is the local temporary address (RCoA). By registering only the newly obtained link temporary address (LCoA) to the mobile anchor point (MAP) (50) it is possible to complete the location registration. Finally, in the hierarchical Mobile Internet Protocol (HMIP), when mobile terminals (MNs) 10 and 20 move within mobile anchor point domains (MAP Domains), they bind to home agents (HA) 70 via the Internet. There is no need to update (BU).

In this way, the mobile anchor point (MAP) 50 links with the local temporary address (RCoA) to the binding cache 60 to manage the mobility of all IPv6 communication terminals (mobile terminals (MN) (10, 20)) on the subnet. The temporary address (LCoA) is mapped and registered and managed. Therefore, in the present invention, the mobile station (MN) (10, 20) to generate a RCoA and broadcasts a packet that asks for address duplication to all nodes on the same subnet to check whether the address generated and the address of the neighboring node collide. Instead of casting and receiving the result from each node to determine whether to use an address (DAD process), query the mobile anchor point (MAP) 50 whether the generated RCoA is duplicated in the corresponding subnet, and move anchor point. The MAP 50 checks whether there is a duplication on the basis of the binding cache 60 and informs the mobile terminal (MN) 10, 20.

For reference, according to the related art, looking at a process (DAD process) of checking whether a generated address (RCoA) exists on the same subnet, the mobile station (MN) 10, 20 may receive a neighbor solicitation (NS) message. Is transmitted to all mobile terminals (neighbor nodes) MN belonging to MAP 50.

If another terminal (neighbor node) uses the same address, the terminal transmits a NA (Neighbor Advertisement) message.

On the other hand, if the NA message is not received for a certain period, the new terminal (MN) (10, 20) sending the NS message uses the corresponding address (RCoA).

However, if the terminal (MN) (10, 20) that sent the NS message confirms that the address (RCoA) generated by the NA message is duplicated with another terminal (neighbor node), does not assign the corresponding address (RCoA) .

As described above, the mobile terminal (MN) 10 or 20 generates a local temporary address (RCoA) based on the prefix information sent from the mobile anchor point (MAP) 50 and then checks whether the RCoA address is duplicated. To this end, a packet (broadcasting) is sent to all mobile terminals (neighbor node) MNs belonging to the mobile anchor point (MAP) 50, and the result is received from each node (neighbor node). Decide whether to use an address. However, this process consumes a lot of radio resources, and there is a time delay in generating the RCoA address.

Therefore, in the present invention, by using the binding cache 60 of the mobile anchor point (MAP) 50 to store the local temporary address (RCoA) and the link temporary address (LCoA) of the terminal for mobility management of the terminal, DAD (Duplicate Address Detection) process, which is an essential process for automatic allocation of local temporary addresses (RCoA), is performed quickly.

To this end, the mobile anchor point (MAP) (50) instead of sending a confirmation message to all terminals (MN) on the subnet to check whether the address is duplicated, the mobile terminal (MN) using the binding cache information of the RCoA and LCoA It determines whether the RCoA generated by (10, 20) is duplicated and informs the terminal (MN) 10,20.

In the hierarchical Mobile Internet Protocol (HMIP) network to which the present invention is applied, IPv6 communication terminals (MNs) 10 and 20 belonging to the subnet of the mobile anchor point (MAP) 50 may respond to movement in the subnet. Transparency is guaranteed from the Corresponding Node (80) and the Home Agent (HA) 70.

And, since the mobile anchor point (MAP) 50 registers the LCoA and RCoA of the IPv6 communication terminal (MN) 10,20 to the binding cache 60, the home agent (HA) 70 is a mobile anchor. The packet may be transmitted to the positions of all IPv6 communication terminals (MNs) 10 and 20 belonging to the subnet of the point (MAP) 50. In this case, IPv6 communication terminals (MNs) 10 and 20 belonging to the subnet of the mobile anchor point (MAP) 50 should generate two CoAs. For example, a mobile terminal (MN) 10 entering an access router 1 (AR1) 30 generates two CoAs. One is the RCoA used on the link of the moving anchor point (MAP) 50, and the other is the LCoA applied to the outer link. At this time, RCoA is generated in the stateless mode.

Subsequently, the mobile terminals (MNs) 10 and 20 that generate the RCoA based on the prefix information sent from the mobile anchor point (MAP) 50 update the local binding to the mobile anchor point (MAP) 50 (Local BU). ) Send a message. Here, the local binding update message is a message that the mobile terminal (MN) 10, 20 sends to the mobile anchor point (MAP) 50 to bind the RCoA and the LCoA. At this time, LCoA is used as the source address of the BU.

Next, the mobile anchor point (MAP) 50 checks whether the RCoA is the only address on the subnet, in order to bind the RCoA and LCoA of the mobile terminal (MN) 10,20, wherein the binding cache 60 Stored binding cache information (RCoA, LCoA) is used. In this way, the mobile anchor point (MAP) 50 performs the DAD process on behalf of the mobile terminal (MN) (10, 20), and informs the mobile terminal (MN) (10, 20) as a binding acknowledgment. In this packet, specify whether the binding succeeded or failed.

3 is a flowchart illustrating a method for automatically setting a local temporary address of a terminal in a hierarchical mobile internet protocol network according to the present invention.

As described above, the mobile anchor point (MAP) 50 is a local temporary address (RCoA) in the binding cache 60 to manage the mobility of all IPv6 communication terminals (mobile terminals (MN) 10,20) on the subnet. ) And link temporary address (LCoA) are mapped and registered.

If the mobile station (MN) 10 generates a local temporary address (RCoA) based on the prefix information sent from the mobile anchor point (MAP) 50 (301, 302), the generated RCoA is duplicated in the corresponding subnet. A local binding update (Local BU) message is sent to the mobile anchor point (MAP) 50 to see if it is successful (303).

Then, the mobile anchor point (MAP) 50 checks whether there is a duplication based on the binding cache 60 (304), and informs the result through a binding acknowledge message (305). This packet specifies whether the binding succeeded or failed.

As described above, the method of the present invention may be implemented as a program and stored in a recording medium (CD-ROM, RAM, ROM, floppy disk, hard disk, magneto-optical disk, etc.) in a computer-readable form. Since this process can be easily implemented by those skilled in the art will not be described in more detail.

The present invention described above is capable of various substitutions, modifications, and changes without departing from the technical spirit of the present invention for those skilled in the art to which the present invention pertains. It is not limited by the drawings.

The present invention as described above, in the structure using a hierarchical MIPv6, by using the RCoA and LCoA of the IPv6 communication terminal in the MAP, by performing a DAD process, which is an essential process for automatic RCoA address assignment, by the resource, This can save cost and reduce delays in address generation.

In addition, the present invention has the effect of providing a seamless service by facilitating mobility support by reducing the time taken to generate an address when the mobile terminal actively moves, that is, when the moving speed is high.

Claims (3)

A method for automatically setting a local temporary address of a terminal in a hierarchical mobile internet protocol network, Mapping and managing a local temporary address (RCoA) and a link temporary address (LCoA) to a binding cache for mobility management of a mobile terminal in a mobile anchor point domain; When a mobile terminal transmits a local binding update (Local BU) message to check whether local temporary addresses generated by using prefix information of a mobile anchor point (MAP) are duplicated, the mobile anchor point based on the binding cache. Checking whether the address is a duplicate; And The mobile anchor point transmitting a binding acknowledgment (BA) message to the mobile terminal according to whether the local temporary address is uniquely used in the corresponding subnet, and notifying the result of the binding according to the check result; Method of automatically setting a local temporary address of a terminal in a hierarchical mobile Internet protocol network. The method of claim 1, The one mobile terminal, After generating the local temporary address, by broadcasting a packet asking whether all the neighboring nodes (other mobile terminals) belonging to the mobile anchor point whether the address is duplicate, instead of receiving the result from the neighbor node to determine whether to use the address And, requesting the mobile anchor point to check whether the local temporary address is duplicated, and automatically setting the local temporary address of the terminal in the hierarchical mobile internet protocol network. In the hierarchical mobile Internet protocol network, in order to automatically set the local temporary address of the terminal, Mapping and managing a local temporary address (RCoA) and a link temporary address (LCoA) to a binding cache for mobility management of a mobile terminal in a mobile anchor point domain; When a mobile terminal transmits a local binding update (Local BU) message to check whether local temporary addresses generated by using prefix information of a mobile anchor point (MAP) are duplicated, the mobile anchor point based on the binding cache. The ability to check for duplicate addresses; And As a result of the check, the mobile anchor point transmits a binding acknowledgment (BA) message to the one mobile terminal according to whether the local temporary address is used uniquely in the corresponding subnet and informs the binding result. A computer-readable recording medium having recorded thereon a program for realizing this.

Images