KR20050078309A - Method and apparatus for providing mobile internet protocol service using variable home agent - Google Patents

Abstract

The present invention relates to a method and apparatus for providing a mobile Internet service using a home agent for delivering packet data received from a counterpart node to a mobile node.

In the present invention, when the mobile node moves from the home subnet to the visited subnet, the home agent of the home subnet checks the IP address of the visited agent managing the visited subnet, and then checks the IP address of the checked visited agent. And compare their IP addresses with each other. Thereafter, if the IP address of the home agent and the visiting agent are different from each other, the home agent of the position closest to the visiting subnet is variably routed by another subnet mask, and the routed home agent visits packet data received from the partner node. Forward to mobile node located in subnet.

Through this, it is possible to achieve a huge increase in revenue by optimizing the packet delivery path according to the location movement for each mobile terminal.

Description

Method for providing mobile IP service using variable home agent and device therefor {METHOD AND APPARATUS FOR PROVIDING MOBILE INTERNET PROTOCOL SERVICE USING VARIABLE HOME AGENT}

The present invention relates to a method and a device for providing a mobile IP service, and more particularly, to a method and a device for providing a mobile IP service using a variable home agent.

In general, every terminal on the Internet has a 32-bit Internet Protocol (IP) address to identify itself, and routing for IP packet forwarding is the destination IP address of the packet. Based on this, it determines where the next moving position is from the current position and the destination is reached.

At this time, the IP address is divided into a network identifier and a terminal ID, and a subnet mask is used for this classification. In addition, this classification of IP addresses allows for quick and effective determination of the next location in routing.

For this reason, when a terminal moves out of its network area to another network on the Internet, unless the IP address of the terminal is changed to an IP address corresponding to the moved network, routing information is different and Internet service is impossible.

Mobile IP is a protocol that enables a terminal to receive Internet service without changing its IP address when the mobile terminal moves out of its network area to another network.

Mobile IP registers the home address of a mobile node (aka mobile terminal) in HA (Home Agent, hereinafter referred to as 'HA'), and then moves to another area (subnet) when a mobile node moves to a new temporary location for connection. It is based on a method of informing a HA by receiving a care-of address from an FA (Foreign Agent). A display example of such a mobile IP is attached to FIG. 1.

As shown in Fig. 1, if the mobile node is in the home network A, the mobile node operates without the mobile service. When the mobile node returns to the home network, the mobile node deletes the registration with the HA through the Registration Request and Registration Reply messages with the HA.

On the other hand, if the mobile node has moved to the external network B, the mobile node must first receive a temporary address from the FA of the external network. The mobile node then registers with the HA its temporary address obtained from the FA. The HA then advertises the accessibility of the mobile node's network identifier, then receives packets coming to the mobile node and tunnels them to a temporary address.

However, such a mobile IP service in the existing mobile node should inform the HA of the terminal whenever the mobile node moves to another subnet, and even if it is not communicating, it must send its location information to the HA. As a result, the larger the number of mobile nodes, i.e., mobile terminals, is, the greater the signal packet amount becomes.

In addition, when the mobile terminal moves to another subnet, the packet sent to the mobile terminal is transmitted through tunneling to the FA of the subnet that the HA intercepts. That is, the longer the moving path has a problem that the longer the tunneling length. A display example of such a tunneling process is shown in FIG. 2.

As shown in FIG. 2, when the mobile node moves to the same subnet as the other node transmitting the packet, the packet forwarding path may be one hop away from the transmitting node directly to the mobile node.

However, the packet forwarding path following the existing mobile IP goes from the transport node to the HA and from the HA to the mobile node via the FA with the current transport node. This means that the packet forwarding path will be inefficiently long, and the more inefficient the mobile node moves away from the HA.

The technical problem to be achieved by the present invention is to solve this problem, a method of providing a mobile IP (IP) service using a variable home agent that can increase the revenue by optimizing the packet transmission length according to the location movement by mobile terminal and It is for providing the device.

In addition, the present invention is to provide a method and apparatus for providing a mobile IP (IP) service using a variable home agent that allows a client to use a wireless Internet service anytime, anywhere.

Mobile IP (IP) service providing method using a variable home agent in accordance with a feature of the present invention for achieving this object, the mobile using a home agent (Home Agent) for delivering the packet data received from the partner node to the mobile node In a method of providing an Internet Protocol service, a) when a mobile node moves from a home subnet to a visited subnet, a home agent managing the home subnet manages the visited subnet. Checking the IP address of the; b) comparing the checked IP address of the visited agent with the IP address of the home agent; And c) if the IP address of the visit and home agent is different, the home agent variably routing a home agent at a location closest to the visited subnet.

And d) updating the routing information of at least one router located in a lower direction of the home agent and the home agent by the set home agent; And e) forwarding, by the set home agent, packet data received from the counterpart node to the mobile node located in the visited subnet according to the updated routing information.

In addition, a mobile IP service providing apparatus using a variable home agent according to an aspect of the present invention, in the mobile IP (Internet Protocol) service providing apparatus for delivering the packet data received from the partner node to the mobile node, When the mobile node moves from the home subnet to the visited subnet, checks the IP address of the visiting agent managing the visited subnet and its own IP address, and if the IP address is different, the visited subnet and the visited subnet. Aid home agents that variably route the home agent in the nearest location.

After updating the routing information of the home agent of the home subnet and at least one router located in a lower direction of the home agent, packet data received from the counterpart node according to the updated routing information is updated. It further comprises a new home agent for delivering to the mobile node located in the visited subnet.

In addition, a recording medium storing a program according to an aspect of the present invention, the recording medium including a method for providing a mobile Internet (Internet Protocol) service using a Home Agent for delivering the packet data received from the partner node to the mobile node In the medium, a) when the mobile node moves from the home subnet to the visited subnet, the home agent managing the home subnet checks the IP address of the visited agent managing the visited subnet. ; b) comparing the checked IP address of the visited agent with the IP address of the home agent; And c) if the IP address of the visit and home agent is different, the home agent variably routing the home agent at the location closest to the visited subnet. It is characterized by.

DETAILED DESCRIPTION Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art may easily implement the present invention. As those skilled in the art would realize, the described embodiments may be modified in various different ways, all without departing from the spirit or scope of the present invention. In the drawings, parts irrelevant to the description are omitted in order to clearly describe the present invention. Like parts are designated by like reference numerals throughout the specification.

3 and 4 are conceptual views illustrating a variable mobile IP service providing method according to an embodiment of the present invention.

First, as shown in FIG. 3, the method of providing a variable Mobile IP service according to an embodiment of the present invention may be applied to a wireless Internet environment having a tree structure. However, this is not limited to the present invention and can be applied to other environments.

In detail, the wireless Internet manager first assigns each subnet's IP address layered from the root of the tree to the branch.

At this time, the IP address is divided into a network identifier and an ID of a mobile terminal. A subnet mask (subnet mask, also referred to as a 'subnet mask') is used for this classification. In addition, IP address classification using such a subnet mask enables routing quickly and effectively.

That is, routing on the Internet delivers the packet to the final destination while the HA (Home Agent, hereinafter referred to as 'HA') decides where to move next from the current location based on the destination IP address of the packet to be transmitted. At this time, however, the HA uses the network identifier of the IP address to determine the next moving location to deliver the packet. In the final stage, the IP address of the mobile terminal is viewed and the packet data is transmitted to the destination terminal.

A detailed description with reference to FIG. 4 is as follows.

As shown in FIG. 4, the mobile node (mobile terminal) 400 located in the subnet B of the access network 430 relates to a process for providing a mobile IP service when the mobile node moves to subnet C of the same access network 430. , Look at each address first.

First, the address of the original HA (a) located in subnet B is 1.1.2.0/24, and the address of FA (Foreign Agent, B, hereinafter referred to as 'FA') located in subnet C is 1.2.1.0/24. . In this case, it can be seen that 8 bits and later of each IP address are different from each other. In other words, when the partner node 300 wants to transmit packet data to the mobile node 400, the packet data received from the partner node 300 is transmitted to the aided HA (a) by tunneling and thus a considerable distance. Via.

And, this inefficient packet delivery path is more inefficient as the mobile node 400 moves away from the original HA (a).

Therefore, in the embodiment of the present invention, HA can be variably changed to deliver packet data received from the counterpart node to the mobile node, thereby increasing profits by optimizing the packet transmission length according to the location movement of each mobile terminal.

In detail, first, when the mobile node 400 moves its location, the mobile node receives a temporary address from FA (B) of subnet C and registers the assigned temporary address with the original HA (a).

Subsequently, the original HA (a) compares the IP address of the original HA (a) with the IP address of the FA (b) managing the subnet C where the mobile node 400 is located. Finds a difference.

Then, the original HA (a) transfers the HA authority of the mobile node to the HA of the core network 410 by the different subnet mask. That is, the HA of the core network 410 which is different from the original HA (a) by 8 bits or less is designated as the new HA. In the embodiment of the present invention, HA (A) having an address of 1.0.0.1/8 on the core network 410 side is designated as a new HA.

Then, the new HA (A) sends information to update the routing information to the existing original HA (a) and the lower router in the direction of the original HA, and the mobile node 400 also binds the changed new HA (A).

Through this, the packet transmitted from the partner node 300 is sent to the new newborn HA (A), and the newborn HA (A) tunnels and forwards the received packet to the FA (B). Then, the FA (B) also delivers the received packet to the mobile node 400 that is the destination terminal. At this time, the forwarding path is about 5 hops, which is about 2 hops shorter than the packet forwarding path according to the existing mobile IP.

For reference, if the partner node exists outside the core network 410, routing of the mobile node is ensured by first searching the address of the mobile node registered in the HA before determining the next hop as the network identifier when routing the HA.

As such, the method and apparatus for providing a mobile IP service using a variable home agent according to an embodiment of the present invention optimize a packet forwarding path according to a location movement for each mobile terminal through a routing method for varying HA. Make a huge profit increase. In addition, this allows clients to freely use the wireless Internet service anytime, anywhere.

Then, the mobile IP (IP) service providing method using a variable home agent according to the present invention will be described through the accompanying drawings.

5 is a flowchart sequentially illustrating a process of providing a variable mobile IP service according to an embodiment of the present invention.

As shown in FIG. 5, when the mobile node 400 where the session is started (S510) moves to a position (S520), the mobile node 400 checks whether its located subnet is a home network, that is, a home subnet (S530). ).

As a result, if the subnet where the mobile node 400 is located is the home subnet, the mobile registration is released (S540), while if the subnet where the mobile node 400 is located is the visiting subnet, the mobile registration is performed to the original HA (a) ( S550). That is, the temporary address received from the FA (b) of the visited subnet is registered in the original HA (a).

Thereafter, the original HA compares the temporary address of the mobile node with the IP address of the HA itself (S560), and changes the new HA to a router toward the core network 410 if it is outside the IP subnet of the original HA (S570).

Then, the new HA (A) has all the routers below the mobile node IP address to update the routing information (S571), the mobile node and the new HA binds the HA address (S542).

If the position of the subnet where the mobile node moves to is located within the current HA subnet range, the HA compares whether the mobile node moves in the direction of the mobile node address (S580).

As a result of the comparison, the HA of the access network side is changed to the new HA as much as the subnet mask is different in the case of the mobile node address direction (S581), and the HA is not changed unless the direction of the mobile node address is the comparison result (S582). This is to comply with the basic principles of routing and to solve the complexity that can occur when moving multiple times.

When the mobile device returns to its home network, the mobile device releases all HA binding and routing information related to the mobile device (S583).

The drawings and detailed description of the invention are exemplary only, and are used for the purpose of illustrating the invention only, and are not intended to be limiting or to limit the scope of the invention described in the claims. Therefore, those skilled in the art will understand that various modifications and equivalent other embodiments are possible from this. Therefore, the true technical protection scope of the present invention will be defined by the technical spirit of the appended claims.

Mobile IP service providing method and apparatus using a variable home agent according to the present invention by varying the HA to optimize the packet delivery path according to the location movement of each mobile terminal, to achieve a huge profit increase do. In addition, there is an effect that allows the client to freely use the wireless Internet service anytime, anywhere.

1 and 2 is a conceptual diagram for explaining a mobile IP (Mobile IP) technology according to the prior art.

3 and 4 are conceptual views illustrating a variable mobile IP service providing method according to an embodiment of the present invention.

5 is a flowchart sequentially illustrating a process of providing a variable mobile IP service according to an embodiment of the present invention.

Claims (9)

In the method for providing a mobile Internet (Internet Protocol) service using a home agent for transmitting the packet data received from the partner node to the mobile node, a) when the mobile node moves from the home subnet to the visited subnet, verifying, by the home agent managing the home subnet, the IP address of the visited agent managing the visited subnet; b) comparing the checked IP address of the visited agent with the IP address of the home agent; And c) if the IP address of the visit and home agent is different, the home agent variably routing the home agent of the location closest to the visited subnet Mobile IP (IP) service providing method using a variable home agent comprising a. According to claim 1, d) updating, by the configured home agent, routing information of a home agent of the home subnet and at least one router located in a lower direction of the home agent; And e) forwarding, by the set home agent, packet data received from the counterpart node to a mobile node located in the visited subnet according to the updated routing information. Mobile IP (IP) service providing method using a variable home agent further comprising. The method of claim 2, Step c) is Checking the number of decimal places located in the IP address representing the four decimal numbers separated by a period; And Variably setting a home agent having a different IP address with a decimal number at the same location as the decimal number of the identified location; Mobile IP (IP) service providing method using a variable home agent comprising a. The method of claim 2, In step d), Binding of the changed home agent of the mobile node by the set home agent Mobile IP (IP) service providing method using a variable home agent comprising a. The method of claim 2, Step a) is Registering the temporary address assigned by the mobile node having moved from the visited agent of the visited subnet; Mobile IP (IP) service providing method using a variable home agent comprising a. In the mobile Internet (Internet Protocol) service providing apparatus for delivering the packet data received from the partner node to the mobile node, When the mobile node moves from the home subnet to the visited subnet, checks the IP address of the visiting agent managing the visited subnet and its own IP address, and if the IP address is different, the visited subnet and the visited subnet. Aid home agent that variably routes home agent in closest location Mobile IP (IP) service providing apparatus using a variable home agent comprising a. The method of claim 6, After updating the routing information of the home agent of the home subnet and at least one router located in a lower direction of the home agent, the packet data received from the counterpart node is visited according to the updated routing information. New Home Agent Forwarding to a Mobile Node Located on a Subnet Mobile IP (IP) service providing apparatus using a variable home agent further comprising. The method of claim 7, wherein The aid home agent, After confirming that the decimal number is located in the IP address expressing the four decimal numbers separated by a period, the home agent having a different IP address of the decimal number in the same position as the decimal number of the identified position is variably set Mobile IP (IP) service providing apparatus using a variable home agent. In the recording medium comprising a method for providing a mobile Internet (Internet Protocol) service using a home agent for delivering the packet data received from the partner node to the mobile node, a) when the mobile node moves from a home subnet to a visited subnet, a function of the home agent managing the home subnet to check the IP address of the visited agent managing the visited subnet; b) comparing the checked IP address of the visited agent with the IP address of the home agent; And c) if the IP address of the visit and home agent is different, the home agent variably routes the home agent of the location closest to the visited subnet A computer-readable recording medium having a program recorded thereon.