KR20070065614A - Method for providing an roaming communication on moving from the mobile ipv6 network to the mobile ipv4 network - Google Patents

Abstract

A method for providing roaming communication when an MN(Mobile Node) moves from a mobile IPv6 network to a mobile IPv4 network is provided to register the address of an MN doubly in an HA(Home Agent) of a mobile IPv6 network and an HA of a mobile IPv4 network so that the MN can seamlessly execute communication in the mobile IPv4 network in case the MN moves from the mobile IPv6 network to the mobile IPv4 network. In case an MN, connected to a mobile IPv6 network, gets out of an HA of the IPv6 network and moves to a mobile IPv4 network, the MN primarily registers an FA(Foreign Agent) of the mobile IPv4 network as its own HA in the mobile IPv4 network(S50). The MN uses a dual stack having both IPv4 protocol and IPv6 protocol. In case the MN using the dual stack moves from the mobile IPv6 network to the mobile IPv4 network, the MN uses a registration request message containing an IPv4 CoA(Care of Address) in registering the FA as its own HA in the mobile IPv4 network. A BR(Boundary Router), which exists at the boundary between the mobile IPv6 network to the mobile IPv4 network, converts the registration request message into a binding update message and secondarily registers the MN's new address in the mobile IPv4 network in the MN's previous HA of the mobile IPv6 network, based on the converted binding update message(S60).

Description

Method for providing an roaming communication on moving from the mobile IPv6 network to the mobile IPv4 network}

1 illustrates a mobile network in which mobile IPv4 and mobile IPv6 coexist.

2 illustrates a flow diagram of a communication method for providing roaming to a mobile node moving from a mobile IPv6 network to a mobile IPv4 network, corresponding to an embodiment of the invention.

3 is a flow chart illustrating in more detail the first step of registering a first agent (FA) of a mobile IPv4 network as a home agent (HA) of a mobile node.

FIG. 4 is a flow chart illustrating in more detail the second step of registering a new address of a mobile node (MN) with a home agent (HA) of a mobile IPv6 network in a mobile IPv4 network.

FIG. 5 illustrates a registration request message and a translated binding update message transmitted from a mobile node moving to a mobile IPv4 network to a home agent of the mobile IPv6 network according to an embodiment of the present invention.

FIG. 6 illustrates a binding acknowledgment message and a converted registration response message transmitted from a home agent of a mobile IPv6 network to a mobile node moving to a mobile IPv4 network according to an embodiment of the present invention.

The present invention relates to network communication, and more particularly, to a method for providing roaming communication to a mobile node moving from a mobile IPv6 network to a mobile IPv4 network.

The number of Internet users is increasing due to the performance improvement of mobile nodes such as portable computers and PDAs and the development of wireless communication technology. If the number of wireless Internet users is increasing as it is, the existing Internet Protocol Version 4 (IPv4) addressing system cannot meet the increasing IP address requirements. Therefore, studies are being actively conducted to provide mobility using Internet Protocol Version 4 (IPv6), which is currently attracting attention as the next generation Internet protocol.

Mobile IPv6 provides mobility while retaining the features of IPv6, so it can support mobility more effectively than mobile IPv4 and has excellent scale and scalability. As computers become smaller and Internet access is available through smaller terminals, mobility support for this becomes inevitable. As a result, efforts to support mobility in the current Internet environment using the Internet Protocol (IP) are underway in the IP routing for Wireless / Mobile Hosts Charter (IETF) of the Internet Engineering Task Force (IETF). Since the standard for supporting mobility of IPv4 was enacted, work on supporting mobility of IPv6 has been made.

Currently, in order to be replaced with mobile IPv6 from mobile IPv4, mobile IPv4 and mobile IPv6 coexist with each other for a long time from the introduction of IPv6. 1 illustrates a mobile network in which mobile IPv4 and mobile IPv6 coexist.

Referring to FIG. 1, when a mobile node (MN) connected to a mobile IPv4 network moves out of a home agent (HA) of a mobile IPv4 network and moves to a mobile IPv6 network, the mobile node (MN) may move to the IPv6 network. You are provided with a Care of Address (CoA). The CoA of the IPv6 should be registered with the home agent (HA) of the mobile IPv4 network, but since the newly provided CoA in the mobile IPv6 network is an IPv6 address, a registration request message to the home agent (HA) of the mobile IPv4 network. ) Cannot be transferred. In addition, when the corresponding node CN connected to the mobile IPv6 network transmits a packet to the mobile node MN, the packet is transmitted to the home agent HA of the mobile IPv4 network through the border router BR. However, the home agent HA of the mobile IPv4 network cannot forward the packet to the mobile node MN since the home agent HA cannot receive the IPv6 CoA from the mobile node MN.

Accordingly, another object of the present invention is to provide a method for roaming communication by a mobile node moving from a mobile IPv6 network to a mobile IPv4 network in a network where mobile IPv4 and mobile IPv6 coexist.

In order to achieve the object of the present invention, a method for providing roaming communication to a mobile node in a network environment in which a mobile IPv4 network and a mobile IPv6 network are connected by a border router is provided in a mobile IPv6 network. First registering a foreign agent of the mobile IPv4 network as a home agent of the mobile node by using a registration request message having a CoA of IPv4 when moving to a mobile IPv4 network (step a) and a home agent of the IPv6 network of the mobile node Converting the registration request message generated to register the mobile node to a binding update message and using the converted binding update message to register the mobile node with a home agent of a mobile IPv6 network (step b). It is characterized by.

Preferably, the step (a) is a mobile node using a dual stack providing a CoA of IPv4 to the mobile node when moving from the mobile IPv6 network to the mobile IPv4 network, a registration request message having the CoA of the IPv4 mobile node And registering a foreign agent of the mobile IPv4 network, which is to manage communication of the mobile node in the mobile IPv4 network, as a home agent of the mobile node in response to the received registration request message. .

Preferably, the step (b) is a step of transmitting a registration request message generated for registering a mobile node to a home agent of an IPv6 network of the mobile node to a border router existing between the mobile IPv4 network and the mobile IPv6 network, Converting the transmitted registration request message into a binding update message and transmitting the converted binding update message to a home agent of a mobile IPv6 network, replacing the binding approval message generated in response to the transmitted binding update message as a registration response message; Converting and transmitting the mobile node to the mobile node and registering the mobile node's address in the mobile IPv6 network with a home agent of the mobile IPv6 network.

Hereinafter, a method of providing roaming communication to a mobile node when moving from a mobile IPv6 network to a mobile IPv4 network will be described in detail with reference to the accompanying drawings.

2 shows a flowchart of a method for providing roaming communication to a mobile node (MN) moving from a mobile IPv6 network to a mobile IPv4 network, corresponding to one embodiment of the invention.

Referring to FIG. 2, when a mobile node (MN) connected to a mobile IPv6 network moves out of the home agent (HA) of the mobile IPv6 network to the mobile IPv4 network, the mobile node (MN) moves the foreign agent (FA) of the mobile IPv4 network to the mobile IPv4 network. A first registration with the home agent HA of the mobile node MN in the network (step 50). The mobile node uses a dual stack with both IPv4 and IPv6 protocols. When a mobile node (MN) using a dual stack moves from a mobile IPv6 network to a mobile IPv4 network, an external agent (FA) of the mobile IPv4 network is used by using a registration request message having a CoA of IPv4. A first registration is made with the home agent HA of the mobile node MN. The first foreign agent FA registered as the home agent HA of the mobile node MN manages communication of the mobile node MN in the mobile IPv4 network.

The boundary router BR existing at the boundary between the mobile IPv4 network and the mobile IPv6 network converts the registration request message into a binding update message and sends the mobile node to the home agent HA of the mobile IPv6 network based on the converted binding update message. Register a new address in the (MN) 's mobile IPv4 network (step 60).

Packets transmitted from the correspondent node CN connected to the mobile IPv4 network are transmitted to the mobile node MN via the home agent HA of the first registered mobile IPv4 network. Meanwhile, the packet transmitted from the correspondent node CN connected to the mobile IPV6 network is transmitted to the mobile node MN through the home agent HA of the second registered mobile IPv6 network.

3 is a flowchart illustrating in more detail a first step of registering a foreign agent FA of a mobile IPv4 network as a home agent HA of a mobile node MN.

Referring to FIG. 3, when a mobile node (MN) moves from a mobile IPv6 network to a mobile IPv4 network, an external agent (FA) of the mobile IPv4 network transmits an advertisement message to the mobile node (MN). Provide a new IPv4 CoA to the mobile node (MN) via the sent advertising message (step 52). The mobile node (MN) receiving the CoA of the IPv4 generates a registration request message including the CoA of the IPv4, and the foreign agent (FA) receives the generated registration request message from the mobile node (MN). (Step 54). The foreign agent FA transmits a registration response message to the mobile node MN in response to the registration request message, thereby transferring the foreign agent FA to the home agent HA of the mobile node in a mobile IPv4 network. Register (step 56).

4 is a flow chart illustrating in more detail the second step of registering a new address in a mobile IPv4 network of a mobile node (MN) with a home agent (HA) in a mobile IPv6 network.

Referring to FIG. 4, a mobile node (MN) moving to a mobile IPv4 network receives a CoA of IPv4 as a source address in order to register a new address of the mobile node (MN) to a home agent (HA) of the mobile IPv6 network. Borderless routers that exist between the mobile IPv4 network and the mobile IPv6 network by generating a registration request message with the IPv4 address temporarily assigned to the home agent (HA) of the mobile IPv6 network by the border router. BR) (step 61). The border router BR converts the registration request message into a binding update message (step 63). The border router BR converts the IPv4 header of the registration request message into the IPv6 header of the binding update message. Preferably, the IPv4 header of the registration request message is converted into the IPv6 header of the binding update message through a stateless IP / ICMP translation (SIIT) algorithm. Meanwhile, the boundary router BR converts the mobile IPv4 header of the registration request message into the mobile IPv6 header of the binding update message.

Referring back to FIG. 4, the border router BR transmits the converted binding update message to the home agent HA of the mobile IPv6 network (step 65), and the home agent HA of the mobile IPv6 network is the binding. In response to the update message, a binding acknowledgment message is generated and transmitted to the edge router BR (step 66). The binding acknowledgment message sets the source address to the home agent (HA) of the mobile IPv6 network and the destination address to the CoA of the IPv4 of the mobile node converted to the IPv6-compatible address format.

The border router BR receives the binding grant message from the home agent HA of the mobile IPv4 network and converts the received binding grant message into a registration response message (step 67). The border router BR converts the IPv6 header of the binding acknowledgment message into an IPv4 header of the registration response message. Preferably, the IPv6 header of the binding grant message is converted into the IPv4 header of the registration response message through a stateless IP / ICMP translation (SIIT) algorithm. Meanwhile, the boundary router BR converts the mobile IPv6 header of the binding acknowledgment message into the mobile IPv4 header of the registration response message. By sending the converted registration response message to the mobile node (MN) of the mobile IPv4 network (step 68), the address of the mobile node (MN) that has moved to the mobile IPv6 network is transmitted to the home agent (HA) of the mobile IPv6 network. Registration is made (step 39).

FIG. 5 illustrates a registration request message and a translated binding update message transmitted from a mobile node (MN) moving to a mobile IPv4 network to a home agent (HA) of a mobile IPv6 network according to an embodiment of the present invention.

FIG. 6 illustrates a binding acknowledgment message and a converted registration response message transmitted from a home agent of a mobile IPv6 network to a mobile node moving to a mobile IPv4 network according to an embodiment of the present invention.

Meanwhile, the above-described embodiments of the present invention can be written as a program that can be executed in a computer, and can be implemented in a general-purpose digital computer that operates the program using a computer-readable recording medium.

The computer-readable recording medium may be a magnetic storage medium (for example, a ROM, a floppy disk, a hard disk, etc.), an optical reading medium (for example, a CD-ROM, DVD, etc.) and a carrier wave (for example, the Internet). Storage medium).

Although the present invention has been described with reference to the embodiments shown in the drawings, this is merely exemplary, and it will be understood by those skilled in the art that various modifications and equivalent other embodiments are possible. Therefore, the true technical protection scope of the present invention will be defined by the technical spirit of the appended claims.

The method for providing roaming communication according to the present invention registers the mobile node's address to the home agent of the mobile IPv4 network and the mobile IPv6 network, respectively, so that the mobile node moves even from the mobile IPv6 network to the mobile IPv4 network. You can continue to communicate in the network.

Claims (7)

A method for providing roaming communication to a mobile node in a network environment where a mobile IPv4 network and a mobile IPv6 network are connected by a border router, the method comprising: (a) when a mobile node using a dual stack moves from a mobile IPv6 network to a mobile IPv4 network, first registering an external agent of the mobile IPv4 network as a home agent of the mobile node by using a registration request message having a CoA of IPv4; step; And (b) converting the registration request message generated to register the mobile node to the home agent of the IPv6 network of the mobile node into a binding update message and using the translated binding update message to attach the mobile node to the home agent of the mobile IPv6 network. Roaming communication providing method comprising the step of registering a second. The method of claim 1, wherein step (a) Providing a CoA of IPv4 to the mobile node when the mobile node using the dual stack moves from the mobile IPv6 network to the mobile IPv4 network; Receiving a registration request message having a CoA of IPv4 from a mobile node; And in response to the received registration request message, first registering an external agent of the mobile IPv4 network as a home agent of the mobile node to manage communication of the mobile node in the mobile IPv4 network. . The method of claim 2, wherein step (b) (b1) transmitting a registration request message generated for registering a mobile node to a home agent of an IPv6 network of the mobile node to a border router existing between the mobile IPv4 network and the mobile IPv6 network; (b2) converting the transmitted registration request message into a binding update message and transmitting the converted binding update message to a home agent of a mobile IPv6 network; (b3) converting the binding acknowledgment message generated in response to the transmitted binding update message into a registration response message and transmitting the binding acknowledgment message to the mobile node; And (b4) roaming communication providing method comprising: registering an address of the mobile node moved to the mobile IPv4 network to a home agent of a mobile IPv6 network. The method of claim 3, wherein step (b2) Converting an IPv4 header of the registration request message to an IPv6 header of a binding request message; And And converting a mobile IPv4 header of the registration request message into a mobile IPv4 header of a binding request message. The method of claim 3, wherein step (b3) Converting an IPv6 header of the binding grant message to an IPv4 header of a registration response message; And And converting a mobile IPv6 header of the binding acknowledgment message into a mobile IPv4 header of a registration response message. The method of claim 3, wherein the registration request message is A method of providing roaming communication, characterized in that a CoA of IPv4 is used as a source address, and a destination address is an IPv4 address temporarily assigned to a home agent (HA) of a mobile IPv6 network by a border router. The method of claim 3, wherein the binding approval message is A roaming communication providing method comprising a home agent (HA) of a mobile IPv6 network as a source address and a CoA of IPv4 of the mobile node converted into an IPv6-compatible address format as a destination address.

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