KR100848456B1 - Apparatus and method for address registration of mobile nodes based on wireless broadband access network - Google Patents

Abstract

An apparatus for registering the address of an MN automatically on a wireless broadband access network and a method therefor are provided to manage the addresses of the mobile nodes efficiently in configuring a service network by using mobile IPv6(Internet Protocol version6) and DHCPv6 in an IPv6 environment, thereby improving user management and charge/authentication methods on a next-generation Internet. An MN(Mobile Node)(10) detects a network location through a router advertisement message periodically transmitted from a router2(22). The MN transmits an address allocation request message to a DHCPv6(Dynamic Host Configuration Protocol version6) server(40) and acquires a CoA2(Care of Address2) through an address allocation response process. The DHCPv6 server requests an HA(Home Agent)(30) to perform address registration through a BU(Binding Update) message and transmits a BA(Binding Acknowledgement) message to the DHCPv6 server to register the instinct HoA(Home Address) of the MN and the allocated CoA2. The MN detects the mobility of networks through a router advertisement message periodically transmitted from a router3(23), transmits an address allocation request message to the DHCPv6 server, and acquires a CoA3 through an address allocation response process. The DHCPv6 server requests the HA to perform address registration through a BU message. The HA transmits a BA message to DHCPv6 server in response to the BU message.

Description

Apparatus and method for address registration of mobile nodes based on wireless broadband access network

1 is an exemplary configuration diagram of a general WiBro network;

2 is a flowchart illustrating a conventional address assignment and registration process;

3 is a flowchart illustrating an embodiment of a method for automatically registering a mobile address according to the present invention;

4 is a block diagram of an embodiment of an automatic mobile address registration apparatus according to the present invention.

* Explanation of symbols on the main parts of the drawing

10: mobile terminal (MN) 21 ~ 23: router (AR)

30: home agent (HA) 40: address assignment server (DHCPv6 server)

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mobile address automatic registration device and a method thereof, and a computer-readable recording medium recording a program for realizing the method. More specifically, the home agent (HA) in a mobile Internet network is described. Mobile address auto-registration device and method and the method which can register with HA using address assigned by DHCP server when user moves to other network through interworking between A computer readable recording medium having recorded thereon a program for realization.

Home Address (HoA) is an address used to uniquely identify each mobile terminal (MN) in Mobile Internet Protocol (Mobile IP).

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

Many researchers and companies expect to evolve into All-IP networks as the communications environment of the future. All-IP simply means that each terminal will have an IP address and will use the IP address to connect the calling party with the receiving party. Among them, WiBro (Wireless-Broadband) portable Internet service is in the commercialization stage.

WiBro Portable Internet Services aims to provide end-to-end IP communications services to users anytime, anywhere. To support seamless wireless Internet access for users in this environment, mobility support is required at the IP layer, and the Internet Engineering Task Force (IETF) is known as Mobile IP (Mobile IP) as a standard for supporting such mobility. Layer mobility was proposed, and mobile IPv6 has been standardized as Request For Comment (RFC) for interworking with Internet version 6 (IPv6).

Mobile In IPv6, a home agent (HA) is used to register a home agent (HA) each time a user moves, and other users who want to communicate with users who move outside are home agents (HA). By inquiring to find out the location of the mobile user to communicate.

However, in a conventional mobile IPv6 environment, when an IPv6 user terminal (mobile terminal (MN)) moves to another network, only the method of generating and registering an address used in the corresponding network by using an automatic address setting method Has been discussed.

However, when an actual IPv6 commercial network is operated, an operator may need to use an address generated in a DHCPv6 network for billing and authentication of a user. In this case, since the mobility registration procedure is performed separately using address assignment and assigned address, there occurs a delay time for message transmission on the user terminal side and a security problem when transmitting a message to the user access network and service provider network. . These security issues are also discussed in the standard specification for providing mobility, which is a problem that should be continuously supplemented in the future.

The present invention has been proposed to solve the above problems, the address assigned by the DHCPv6 server when the user moves to another network through the interworking between the home agent (HA) and the address assignment server (DHCPv6 server) in the portable Internet network It is an object of the present invention to provide a mobile address automatic registration device that can register with HA using a computer, 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.

The apparatus of the present invention for achieving the above object is a mobile address auto-registration device in a portable Internet network, wherein the mobile terminal is assigned a unique home address (HoA) from the portable Internet system every time the network moves (changes). A temporary address assignment means for requesting an address assignment from a mobile address automatic registration device, and allocating a temporary address (CoA) for a corresponding network to the mobile terminal according to an address assignment request from the mobile terminal; And a temporary address registration means for registering the temporary address assigned to the mobile terminal by the temporary address assignment means to a home agent, wherein the mobile address automatic registration device is configured from the mobile address automatic registration device. It is characterized in that the temporary address is not registered directly to the home agent.
The apparatus of the present invention may further include temporary address management means for managing the temporary address allocated by the temporary address assignment means for each home address of the mobile terminal.

Meanwhile, the method of the present invention is a method for automatically registering a mobile address in a mobile internet network, wherein the mobile terminal automatically registers a mobile address at every network movement (change) in a state in which the mobile terminal is assigned a unique home address (HoA) from the mobile internet system. Requesting an address assignment from a device and allocating a temporary address (CoA) for the network to the mobile terminal upon receiving an address assignment request from the mobile terminal; And a registration step of registering the temporary address assigned to the mobile terminal to a home agent, wherein the mobile terminal does not directly register the temporary address assigned from the automatic address registration device to the home agent. It features.

The method may further include a management step of managing the temporary address allocated to the mobile terminal for each home address of the mobile terminal.

delete

In the present invention, when the user moves to another network through the interworking between the mobile agent (HA) of Mobile IPv6 for providing mobility and the DHCPv6 server for address assignment, the user registers with the home agent (HA) using the address assigned by the DHCPv6 server. Through this, the procedure that registration should be done by using the secure tunnel between the mobile terminal (MN) and the home agent (HA) when the user moves, and the registration procedure is made in the service provider network, so that more secure message delivery is possible. The delay time during transmission can be reduced.

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.

1 is a diagram illustrating a configuration of a general WiBro network.

As shown in FIG. 1, a typical WiBro network includes a mobile terminal (MN) 10 and a mobile terminal (MN) that provide a service through a wireless connection with a radio access station (RAS). (10) is composed of a base station (RAS) for connecting a wireless connection with an IP (Internet Protocol) network and an access control router (ACR) for IP access and mobility management.

Here, the base station (RAS) and the control station (ACR) may be integrated in one device or may be separately configured.

When the packet is delivered to the mobile terminal (MN) 10 from the outside of the wireless access network, the packet is delivered to the base station apparatus (BS) through a router (AR: Access Router) 21 to 23, and the base station apparatus (BS) is mobile. The packet is delivered to the terminal (MN) 10.

In the network configuration of FIG. 1, it is assumed that the home agent (HA) 30 and the address assignment server (DHPC server) 40 are servers managed inside the operator network (Network 1), and the upper network is provided with sufficient security. do. Sub-networks (Network 2 and Network 3) are networks to which users are connected and are public networks publicly. Therefore, the user is provided with the registration, authentication, and service of the user through these networks (Network 2 and Network 3).

Mobile IPv6 is a protocol that provides mobility in the IPv6 Internet so that all nodes (mobile terminals (MN) 10) do not connect while on the move.

The IPv6 address setup process uses the Dynamic Host Configuration Protocol (DHCP) v6 protocol to generate an address for the host to use based on how the address management (assignment) server (DHCP server) assigns the address to the host and the network information. There is a way. In the present invention, it is assumed that the address is set through the DHCPv6 server, and the IPv6 address auto-configuration process will be discussed.

Under the above-described network, referring to the conventional address assignment and registration process with reference to FIG. 2, there is a Mobile IPv6 and DHCPv6 server 40 separately, and Mobile IPv6 registration for address assignment and mobility provision in the network. In order to operate separately, separate protocols are used. That is, the user is assigned an address 2 (CoA2) that can be used through the DHCPv6 server 40 when the initial network (Network 2) access (202, 203). That is, the mobile terminal (MN) 10 detects its network location through a Router Advertisement message periodically transmitted by Router 2 (22) of the corresponding network (Network 2) (201), DHCPv6 server In step 40, an address allocation request may be requested (202), and a temporary address 2 (CoA2) may be obtained through an address allocation process (203).

Subsequently, the mobile terminal (MN) 10 requests the home agent (HA) 30 to register an address through a binding update (BU: Binding Update) message (204), and the home agent (HA) 30 sends the BU. In response to the message, a binding acknowledgment message is transmitted (205) to register the HoA of the mobile terminal (MN) 10 and the newly assigned CoA2. That is, the mobile terminal (MN) 10 informs the home agent (HA) 30 of CoA2 and HoA so that the home agent (HA) 30 forwards the packet to the current location of the mobile terminal (MN) 10. A binding update (BU) to be delivered, and the home agent (HA) 30 that receives the BU message maintains a binding list of HoA and CoA2.

Next, when the mobile terminal (MN) 10 leaves Network 2 and moves to another network (Network 3), the mobile terminal (MN) 10 is a router 3 (23) of the network (Network 3) ) Detects the mobility (Network 2 → Network 3) of the network through a Router Advertisement message (206) that is periodically transmitted (Address Allocation Request) to the DHCPv6 server 40 (207) The temporary address 3 (CoA3) is obtained through the address allocation response process 208.

Subsequently, the mobile terminal (MN) 10 requests an address registration to the home agent (HA) 30 through a binding update (BU) message (BU) (209), and the home agent (HA) 30 sends a BU. In response to the message, a binding acknowledgment message is transmitted (210) to register the HoA of the mobile terminal (MN) 10 and the newly assigned CoA3. That is, the mobile terminal (MN) 10 informs the home agent (HA) 30 of CoA3 and HoA so that the home agent (HA) 30 forwards the packet to the current location of the mobile terminal (MN) 10. A binding update (BU) to be delivered, and the home agent (HA) 30 that receives the BU message maintains a binding list of HoA and CoA3.

The reason why the DHCPv6 protocol is used in the IPv6 environment is to allocate a user's address so that the user can be managed in the network for user authentication and future billing in an operator network (Network 1). . Therefore, in the conventional method, the home agent (HA) 30 and the DHCPv6 protocol operate separately, so that the user must register (bind update (BU)) an address with the home agent (HA) 30 every time the user moves ( 204 to 205 (209 to 210) are necessary. In addition, a security tunnel using an encapsulation security payload (ESP) and an authentication header (AH) is established between the user terminal (mobile terminal (MN) 10) and the home agent (HA) 30 for such a binding update (BU) procedure. It must be created in advance.

Therefore, by providing an efficient user mobility providing method and address management method when configuring a service network using Mobile IPv6 and DHCPv6 in an IPv6 environment, it is possible to improve user management and billing / authentication methods in the next generation Internet network. In particular, it can solve the processing delay and security problems that occur when registering the user address in the user access network.

Therefore, in the present invention, instead of transmitting a message for registration in the secure tunnel generation and the user terminal (mobile terminal (MN) 10) to the home agent (HA) 30, the home agent directly from the DHCPv6 server 40 The HA 30 uses a method of performing registration for the corresponding terminal (mobile terminal (MN) 10).

In this method, delay time for data transmission between the mobile terminal (MN) 10 and the home agent (HA) 30 can be reduced, and resources for creating a secure tunnel for message transmission can be reduced. have. Therefore, there is an advantage that can reduce the security issue that is a vulnerability in the Mobile IPv6 environment.

The message transmitted by the DHCPv6 server 40 to the home agent (HA) 30 uses a format defined in the Mobile IPv6 standard, and the registration procedure that the mobile terminal (MN) 10 transmits to another terminal is an existing Mobile IPv6. Since the procedure is the same as defined in the above, a detailed description thereof will be omitted.

The structure of the DHCPv6 server 40 using the method proposed by the present invention is shown in FIG.

As shown in FIG. 4, a block (Mobile IPv6 registration message processing unit 42) for mobile IPv6 registration and registration response message processing to a function of the existing DHCPv6 server (DHCPv6 server basic function unit 41) and Mobile IPv6 A block for managing HoA (Home Address) and Care-of-Address (CoA) address used (Mobile IPv6 address manager 43) is additionally configured, and is configured to interwork with the function of an existing DHCPv6 server.

Looking specifically at the configuration, the address auto-registration device (DHCPv6 server) 40, in accordance with the address assignment request, to allocate a mobile IP (Mobile IP) address (temporary address CoA) of the mobile terminal (MN) 10 Whenever a temporary address is allocated from the DHCPv6 server basic function unit 41 and the DHCPv6 server basic function unit 41, the unique home address (HoA) of the mobile terminal (MN) 10 and the DHCPv6 server basic function unit ( Mobile IPv6 registration message processing unit 42 for registering the temporary address (CoA) assigned in 41) to the home agent (HA) 30, and the temporary address (CoA) assigned in the DHCPv6 server basic function unit 41 ), The Mobile IPv6 address management unit 43 for managing the home address (HoA) for each.

Here, the Mobile IPv6 address manager 43 manages a list of pre-assigned CoAs, and manages the corresponding CoA list in the same manner as the address time-out time managed by the DHCPv6 server 40, and the corresponding address. When the timeout for expires, delete it from the list.

The mobile IPv6 registration message processing unit 42 performs a function of the terminal (mobile terminal (MN) 11) of the messages used in Mobile IPv6 to process a message required for registration. At this time, the processed message processes four messages of "Binding Refresh Request Message", "Binding Update Message", "Binding Acknowledgement Message", and "Binding Error Message" among the messages used in Mobile IPv6.

For reference, the "Binding Update message" indicates that the mobile terminal (MN) 10 transmits its own care-of-address (COA) to the home agent (HA) 30 and the other terminal (CN: Correspondent Node). It is used to inform. In addition, the "Binding Acknowledgment Message" is transmitted by the Home Agent (HA) 30 to the Mobile Terminal (MN) 10 in response to the Binding Update message. In addition, the "Binding Refresh Request message" is transmitted when another terminal CN requests a binding update from the mobile terminal (MN) 10. The mobile terminal (MN) 10 must transmit a binding update message before the life-time of the binding information ends, until the timer of another terminal (CN) actively exchanging data is about to terminate. In the case of not receiving the binding update message from the) 10, a binding update request message is sent to the mobile terminal (MN) 10 to request the binding update. In addition, a "Binding Error message" is used when another terminal (CN) signals a mobility related error.

That is, when the terminal (mobile terminal (MN) 10) is requested in the DHCPv6 server basic function unit 41 and the requested address is assigned, the Mobile IPv6 registration message processing unit 42 is assigned to the Mobile IPv6 HA (30). Performs a function to request registration for an address assigned to). At this time, the registration request message includes the HoA and CoA of the terminal (mobile terminal (MN) 10) assigned an address. The message is triggered by internal system communication after address assignment in DHCPv6 server basic function unit 41. Each message is identical to the message structure defined in the Mobile IPv6 standard.

Mobile IPv6 address management unit 43 manages the address of the terminal (mobile terminal (MN) 10) assigned by the DHCPv6 server basic function unit 41, the type of the managed address is managed for each HoA and CoA. The managed address manages an address where the Mobile IPv6 registration message processor 42 transmits a binding update (BU) message to the home agent (HA) 30. The address managed in this block 43 manages a list of previously assigned CoAs in addition to HoA and CoA managed by the home agent (HA) 30. The CoA list is managed in the same manner as the address time-out time managed by the DHCPv6 server 40, and when the time-out for the address expires, the CoA list is deleted from the list.

Then, the mobile address automatic registration process according to the present invention will be described in more detail with reference to FIG. 3.

As described above, in the present invention, the IPv6 Address Auto-configuration process is discussed, and the address setting process through the DHCPv6 server is assumed.

First, when a user connects to an initial network (Network 2), an address 2 (CoA2) that can be used through the DHCPv6 server 40 is allocated (302 and 303). That is, the mobile terminal (MN) 10 detects its network location through a Router Advertisement message periodically transmitted by Router 2 22 of the network (301), and DHCPv6 server. At 40, an address allocation request may be requested (302), and a temporary address 2 (CoA2) may be obtained through a process 303 in response to the address allocation request. This is based on the address assignment request of the mobile terminal (MN) 10, the mobile IP (Mobile IP) address (temporary address CoA2) of the mobile terminal (MN) 10 in the basic function unit 41 of the DHCPv6 server 40 ), Which is the same as the existing procedure.

In this case, when the temporary address 2 (CoA2) is allocated by the DHCPv6 server basic function unit 41, the mobile IPv6 registration message processing unit 42 of the DHCPv6 server 40 may transmit a unique home address (MN) 10 of the mobile terminal (MN) 10. HoA) and the temporary address 2 (CoA2) assigned by the DHCPv6 server basic function unit 41 are automatically registered with the home agent (HA) 30 (304, 305).

That is, the DHCPv6 server 40 requests an address registration to the home agent (HA) 30 through a binding update (BU) message (304), and the home agent (HA) 30 responds to the BU message. In response, a binding acknowledgment message is transmitted to the DHCPv6 server 40 to register the unique HoA of the mobile terminal (MN) 10 and the assigned CoA2. In this way, the DHCPv6 server 40 informs the home agent (HA) 30 of the assigned CoA2 and HoA, so that the home agent (HA) 30 forwards the packet to the current location of the mobile terminal (MN) 10. The home agent (HA) 30 receiving the BU message and receiving the BU message maintains the binding list of the HoA and CoA2.

Next, when the mobile terminal (MN) 10 leaves Network 2 and moves to another network (Network 3), the mobile terminal (MN) 10 is a router 3 (23) of the network (Network 3) ) Detects the mobility (Network 2 → Network 3) of the network through a Router Advertisement message (306) transmitted periodically, and requests an address assignment to the DHCPv6 server 40 (307). The temporary address 3 (CoA3) is obtained through the address allocation response process 308.

At this time, when the temporary address 3 (CoA3) is newly assigned by the DHCPv6 server basic function unit 41, the mobile IPv6 registration message processing unit 42 of the DHCPv6 server 40 performs a unique home address of the mobile terminal (MN) 10. The HoA and the DHCPv6 server basic function unit 41 automatically register the newly assigned temporary address 3 (CoA3) with the home agent (HA) 30 (309 and 310).

That is, the DHCPv6 server 40 requests the address registration to the home agent (HA) 30 through a binding update (BU: Binding Update) message (309), the home agent (HA) 30 for the BU message In response, a binding acknowledgment message is transmitted to the DHCPv6 server 40 to register a unique HoA of the mobile terminal (MN) 10 and a newly assigned CoA3.

As such, the DHCPv6 server 40 notifies the home agent (HA) 30 of the newly assigned CoA3 and HoA so that the home agent (HA) 30 forwards the packet to the current location of the mobile terminal (MN) 10. A binding update (BU) to be delivered, and the home agent (HA) 30 receiving the BU message maintains a binding list of HoA and CoA3.

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.

As described above, the present invention has an effect of improving user management and billing / authentication in the next generation Internet network through efficient mobile address management when configuring a service network using Mobile IPv6 and DHCPv6 in an IPv6 environment.

Claims (12)

In the mobile address automatic registration device in a mobile Internet network, When the mobile terminal is assigned a unique home address (HoA) from the portable Internet system, the mobile terminal automatically requests an address assignment from the mobile address auto-registration device for each network move (change). Temporary address assignment means for allocating a temporary address (CoA) for the network to the mobile terminal in response to an address assignment request from the mobile terminal; And The apparatus for automatically registering mobile addresses includes temporary address registration means for registering the temporary address assigned to the mobile terminal by the temporary address assignment means to a home agent, The mobile terminal, And the mobile address does not directly register the temporary address assigned by the mobile address auto registration device to a home agent. The method of claim 1, Temporary address management means for managing the temporary address allocated by the temporary address assignment means for each home address of the mobile terminal The mobile address automatic registration device further comprising. The method of claim 2, The temporary address management means, And managing the temporary address assigned to the mobile terminal as a temporary address list, and deleting the temporary address from the temporary address list when the timeout for any one temporary address expires. The method according to any one of claims 1 to 3, The temporary address registration means, And registering the temporary address with the home agent by using a binding update message. The method of claim 4, wherein The mobile terminal, The mobile address automatic registration device, characterized in that for detecting the network movement (change) by receiving a router advertisement message. In the mobile address automatic registration method in a mobile Internet network, When the mobile terminal is assigned a unique home address (HoA) from the portable Internet system, the mobile terminal automatically requests an address assignment from the mobile address auto-registration device for each network move (change). Allocating a temporary address (CoA) for the network to the mobile terminal upon receiving an address assignment request from the mobile terminal; And Registering the temporary address assigned to the mobile terminal to a home agent, The mobile terminal, The mobile address auto-registration method of claim 1, wherein the temporary address assigned by the mobile address auto-registration device does not directly register itself with the home agent. The method of claim 6, A management step of managing the temporary address assigned to the mobile terminal for each home address of the mobile terminal; Mobile address automatic registration method further comprising. The method of claim 7, wherein The management step, And managing the temporary address assigned to the mobile terminal as a temporary address list, and deleting the temporary address from the temporary address list when the timeout for any one temporary address expires. The method according to any one of claims 6 to 8, The temporary address is a mobile address automatic registration method, characterized in that the IPv6 (version 6) address. The method of claim 9, The registration step, Registering the temporary address with the home agent using a binding update message. The method of claim 10, The mobile terminal, A mobile address auto-registration method comprising detecting a network movement (change) by receiving a router advertisement message. delete

Images