KR20020096256A - Dynamic mobile address management apparatus and its method and wireless packet service method using them - Google Patents

Abstract

1. TECHNICAL FIELD OF THE INVENTION

The present invention relates to a dynamic address management apparatus and a method thereof, and a wireless packet service method using the same.

2. Technical problem to be solved by the invention

An object of the present invention is to provide a dynamic address management apparatus and method, a wireless packet service method using the same, and a computer readable recording medium having recorded thereon a program for realizing the method.

3. Summary of Solution to Invention

The present invention includes a first step of determining an area of an Internet Protocol (IP) address to be dynamically allocated when a mobile host is accessed; A second step of dynamically allocating an internet protocol address in the determined internet protocol address range to the mobile host; Updating a dynamic domain name system (DNS) to maintain a mapping between a network access identifier (NAI) of the mobile host and the assigned internet protocol address; A fourth step of resolving a name of the mobile host using the dynamic domain name system to obtain the dynamically allocated internet protocol address according to a communication request using the name of the mobile host from any counterpart host; And transmitting the obtained Internet protocol address to the counterpart host so that the counterpart host transmits a packet to the counterpart host using the internet protocol address.

4. Important uses of the invention

The present invention is used in a wireless communication network.

Description

Dynamic address management apparatus and method, and wireless packet service method using the same {Dynamic mobile address management apparatus and its method and wireless packet service method using them}

The present invention relates to a mobile IP (Mobile IP) service implementation technology of a wireless communication network such as a wireless data network, a cellular mobile communication network, a personal digital communication network (PCS), and a next generation mobile communication network (eg, IMT-2000, UMTS). In particular, the present invention relates to a dynamic address management apparatus and a method for providing a mobile Internet service by dynamically allocating an Internet address temporarily in any network currently located with respect to a mobile host, and a wireless packet service method using the same.

First, the terms that help to understand the prior art and the technical gist of the present invention are summarized as follows.

"Home (Home) address" is an Internet Protocol (IP) address that identifies the mobile host, means a uniquely assigned address in the home network.

"Home Network" refers to a network to which the home address of the mobile host belongs.

"Foreign Network" means a network (s) other than the home network to which the mobile host moves to and belongs to another region.

"Care Of Address" is an address used as a forwarding address when belonging to an external network and reflects the current access point of the mobile host. The COA is just the endpoint of the tunnel, which may be the address of an actual foreign agent (an external agent COA) or an address temporarily obtained by a mobile host (co-located COA).

"Agent Advertisement Message" is a message that each mobility agent broadcasts to inform its existence and information about itself.

"Mobility Agent" refers collectively to Home Agents (HAs) and External Agents (FAs), which are agents that manage the mobility of the network to which each agent belongs.

The "Agent Solicitation Message" is a message that requires the mobile host to broadcast an Agent Advertisement message to an Agent in the current network.

"Tunneling" refers to a technique in which a datagram is encapsulated and transmitted to a desired destination, and the destination node is inversely encapsulated to receive the original datagram.

A "home agent (HA)" is an agent belonging to the mobile host's home domain that manages the current COA and home address of the mobile host.

An "external agent (FA)" is an agent belonging to a network other than a home domain, that is, a visited domain.

"Mobile IP Registration Request Message" is a message requesting an agent of a mobile host to bind a COA to a home address.

The "Mobile IP Registration Reply Message" is a response message to the Mobile Internet Protocol Registration Request message.

Now, the prior art will be described.

In general, the Internet uses an Internet Protocol version 4 (IPv4) addressing scheme, which does not natively support host mobility.

On the other hand, Mobile IP (Mobile IP) is a mobile agent's foreign agent (FA: Foreign Agent) and home agent (HA: Home Agent), and the periodic registration of the host to the home agent (HA) and between the mobile agent or Tunneling between the home agent (HA) and the mobile host is used to support the mobility of the host.

However, the mobile host must be assigned a unique Internet Protocol (IP) address in order to receive Mobile Internet Protocol (Mobile IP) service. However, given the current Internet Protocol (IP) addressing system, where shortages are clearly foreseen, it is very difficult to assign Internet Protocol (IP) addresses to all mobile hosts whose demand is rapidly increasing.

As a result, such a lack of address resources will greatly limit the use of mobile Internet protocol services. In other words, since a mobile host must be assigned a unique Internet Protocol (IP) address in order to receive a Mobile IP service, it is possible to assign an Internet Protocol (IP) to all mobile hosts in a situation where demand is increasing. Because there is not.

As a way to solve the above problems, the Dynamic Host Configuration Protocol (DHCP) has been proposed for the dynamic address allocation in Mobile IP. Let's look at it.

Dynamic Host Configuration Protocol (DHCP) acts as a client server model that allows a host to download its environment information and set its own network environment during the initial startup of any host. The address allocation procedure using the Dynamic Host Configuration Protocol (DHCP) is included and operated during the Mobile IP registration procedure.

Dynamically assigned Internet Protocol (IP) addresses are represented in dotted decimal form. However, this has a disadvantage in that it is difficult for a human to remember and difficult to predict a service type by using only an Internet Protocol (IP) address. For this reason, almost all transactions on the Internet are performed using the Domain Name System (DNS), which is easy for humans to understand, and the above Domain Name System (DNS) maps host names to Internet Protocol (IP) addresses. Is a large distributed naming system, particularly useful in mobile communications environments where Internet Protocol (IP) addresses are dynamically changed.

In cell sites such as existing cellular, Global System for Mobile communication / General Packet Radio Service (GSM / GPRS), or Personal Cellular Networks (PCS), the network is located in a network where subscriber stations are located to provide packet data and Internet services to subscribers. Allocate an Internet address to a terminal using Host Configuration Protocol (DHCP) and its own protocol. The IP address thus allocated may be recovered and reassigned to another subscriber station when the session is terminated or the terminal is handed off.

Mobile IP adopts a two-tier addressing scheme as an address translation technique in the Internet Protocol (IP) layer. That is, the first address is the COA used for routing and forwarding methods, and the other address is the mobile host's unique home address (static IP address) used to identify the mobile host and connect to the session. A mobile host has a unique Internet address corresponding to a host name as a home fixed host as a home address, and a mobile host has an address changed as a COA as a delivery point of an actual packet as it moves through the network. Since this COA is an address that changes when moving from network to network, an object that always manages the COA that changes according to the home address and location is needed. In addition, a mechanism is needed to know whether the mobile host has been relocated to another network or beyond to the network boundary in a wireless environment, and how to notify the address translation management object of such changes. I need it.

In this way, the mobile host has a unique Internet address corresponding to the host name as the home static address as a conventional static host, and also has the address changed as the host moves the network as a COA as a delivery point of the actual packet. .

Mobile IP is a modified version of the Internet Protocol (IP) that allows a host to continuously receive datagrams regardless of the location of the connected Internet.

For reference, the IETF defines three components such as mobile host, home agent (HA), and foreign agent (FA) for mobile internet protocol (IP) service. A mobile host is a terminal that supports mobility services, and can move between networks without changing its Internet protocol (IP) address, and continuously with other hosts on the Internet with its fixed Internet protocol (IP) address. Can communicate. The home agent (HA) is an agent belonging to the mobile host's home network that manages the mobile host's current COA and home address. When the mobile host is on an external network, the home agent (HA) delivers the datagram of the mobile host to the network to which the mobile host currently belongs. Tunneling functions. The foreign agent (FA) is an agent that grants a COA when the mobile host belongs to an external network. The foreign agent (FA) may assign its own Internet Protocol (IP) address to the COA or a temporary Internet Protocol (IP) address. When a foreign host enters its service area, the foreign agent (FA) provides a routing service for these hosts, and detunnels the datagram sent from the home agent of the mobile host to the mobile host. For datagrams sent from mobile hosts, an external agent (FA) provides a default gateway service.

On the other hand, in the prior art "Method and Apparatus for addressing a wireless communication station with a dynamically-assigned address", it is optimized when providing a packet data service to a wireless host in a cellular environment such as GSM / GPRS In order to provide a forwarded transmission path and effective address allocation, it has an Internet Protocol Address Server (IAS) that assigns an Internet address, and the wireless host allocates a dynamic temporary address to the packet data communication upon registration request. In the "Korean Patent Application No. 1999-0054995 (Wireless Mobile Server and Method and System for Providing Peer-to-Peer Service with Dynamic DS Update)", GSM-MAP has been proposed. Or in a cellular / PCS environment, such as the American National Standards Institute (ANSI) -41, to dynamically assign an Internet Protocol (IP) address to In order to dynamically and dynamically update the Domain Name System (DNS), a mobile terminal connected to the visited network is assigned a session Internet Protocol (IP) of the visited network, the corresponding Internet Protocol (IP) address and the domain name system (DNS) of the terminal. The combination of names has been proposed to dynamically update the domain name system (DNS) servers in the visited and home networks. In addition, the Journal of the Korean Information Science Society, Volume 27, No. 4 (DNS-Based Location Correction Scheme Supporting Internet Host Mobility), provides an optimal path to reduce the location modification burden of a mobile host in a mobile Internet environment and to provide an optimal path for data transmission. Mobility DNS (MDNS), which adds mobility support of a mobile host to its Domain Name System (DNS), and extracts information related to the relative mobile host name requested from the application of the sending host from the MDNS to provide name resolution to the sending host application. Now MHRS (Mobile Host Resolver) has been proposed.

However, in the above-mentioned prior arts of US Pat. No. 5,864,55A and Korean Patent Application No. 1999-0054995, communication using dynamically assigned addresses is possible only in the network and cannot be roamed. There was a problem that a change in the (DNS) protocol must be accompanied.

In addition, even when the three conventional technologies are comprehensively included, when a mobile terminal, i.e., a host, attempts to access from a visited network far from the home network, the home address is allocated from the home network, which causes delay and bandwidth waste due to triangular routing. There is a problem that occurs.

In addition, the conventional dynamic internet protocol address changing techniques described above have problems that the mobile host cannot operate in server mode and that the internet host address of the mobile host to which the counterpart host communicating with the mobile host is dynamically allocated is not known. It is implicated.

The present invention has been proposed to solve the above-mentioned general problems. In addition, the mobile host dynamically allocates an Internet address temporarily in any visited network in which the mobile host is currently located to efficiently utilize a limited address resource. It is an object of the present invention to provide a dynamic address management apparatus and method for roaming and optimized packet transmission and reception, and a wireless packet service method using the same.

In addition, the mobile host dynamically allocates an Internet address temporarily from any visited network where it is currently located to efficiently utilize limited address resources, and also roams and optimizes during communication using the dynamically allocated address. It is an object of the present invention to provide a dynamic address management method that enables packet transmission and reception of a path, and a computer-readable recording medium having recorded thereon a program for realizing a wireless packet service using the same.

In addition, the present invention dynamically allocates and dynamically allocates a home agent even when at least two home agents are used because an additional home agent of a mobile IP protocol is needed due to an increase in the number of service users. It is an object of the present invention to provide a dynamic address management apparatus and method for roaming and optimized packet transmission and reception, and a wireless packet service method using the same.

In addition, the present invention dynamically allocates and dynamically allocates a home agent even when at least two home agents are used due to an increase in the number of service users. It is another object of the present invention to provide a dynamic address management method that enables roaming and optimized packet transmission and reception during communication using a received address, and a computer-readable recording medium recording a program for realizing a wireless packet service using the same. have.

1 is an exemplary configuration diagram of a system for explaining interworking between a wireless communication network and a mobile IP network to which the present invention is applied.

2 is a block diagram of an embodiment of a dynamic address management apparatus for a wireless packet service according to the present invention;

3 is a flowchart illustrating a dynamic address management method for a wireless packet service and a wireless packet service method using the same according to the present invention.

4 is a flowchart of another embodiment for explaining a dynamic address management method for a wireless packet service and a wireless packet service method using the same according to the present invention;

5 is a flowchart illustrating another embodiment of a dynamic address management method for a wireless packet service and a wireless packet service method using the same according to the present invention.

6 is a schematic diagram illustrating an internet protocol (IP) packet communication process and a routing path process of a packet performing a wireless packet service according to the present invention;

* Explanation of symbols for main parts of the drawings

201: address management interface unit 202: address management request signal processing unit

203: address management unit 204: name-address mapping management unit

205: domain management unit 206: data access request processing unit

207: Mobile IP Database

In the wireless packet service method of the present invention for achieving the above object, in the wireless packet service method in a wireless communication network, an area of an Internet Protocol (IP) address to be dynamically allocated when a mobile host is accessed. Determining a first step; A second step of dynamically allocating an internet protocol address in the determined internet protocol address range to the mobile host; Updating a dynamic domain name system (DNS) to maintain a mapping between a network access identifier (NAI) of the mobile host and the assigned internet protocol address; A fourth step of resolving a name of the mobile host using the dynamic domain name system to obtain the dynamically allocated internet protocol address according to a communication request using the name of the mobile host from any counterpart host; And a fifth step of transferring the obtained internet protocol address to the counterpart host so that the counterpart host transmits a packet to the counterpart host using the internet protocol address.

The wireless packet service method of the present invention may further include a sixth step of dynamically allocating any one of the plurality of home agents to the mobile host when there are a plurality of home agents. .

On the other hand, the apparatus of the present invention, the Internet address management apparatus, the signal receiving means for receiving the Internet address assignment request signal from the outside; Address assignment means for dynamically allocating an Internet address in accordance with an address assignment request signal from the signal reception means; Name-address mapping management means for mapping a name of a mobile host and an internet address dynamically allocated in the address assignment means; Interlocking means for interworking with an external address allocation and mapping function supporting server for an address allocation and mapping function; Domain management means for managing a domain of the mobile host; Signal processing means for processing a data access request signal for address assignment from the address assignment means, the name-address mapping management means, and the domain management means; And information storage means for providing the dynamic allocation related information of the requested internet address through the signal processing means.

Meanwhile, the dynamic address management method of the present invention is a dynamic address management method applied to a dynamic address management apparatus, the first step of dynamically allocating an Internet protocol address in an Internet protocol address area to a mobile host according to an address assignment request. ; And a second step of updating a dynamic domain name system (DNS) to maintain a mapping between a network access identifier (NAI) of the mobile host and the assigned internet protocol address. do.

The dynamic address management method of the present invention may further include a third step of dynamically allocating any one home agent among the plurality of home agents to the mobile host when there are a plurality of home agents. .

On the other hand, the present invention provides a wireless communication network having a processor, comprising: a first function of determining an area of an Internet Protocol (IP) address to be dynamically allocated when a mobile host is accessed; A second function for dynamically allocating an internet protocol address in the determined internet protocol address area to the mobile host; A third function of updating a Dynamic Domain Name System (DNS) to maintain a mapping of a Network Access Identifier (NAI) of the mobile host and the assigned Internet Protocol address; A fourth function of resolving a name of the mobile host using the dynamic domain name system to obtain the dynamically assigned internet protocol address according to a communication request using the name of the mobile host from any counterpart host; And a program for realizing a fifth function of transferring the obtained Internet protocol address to the counterpart host so that the counterpart host transmits a packet to the counterpart host using the internet protocol address. Provide a record carrier.

The present invention also provides a computer readable program having a program for further realizing a sixth function of dynamically allocating any one of the plurality of home agents to the mobile host when there are a plurality of home agents. Provide a record carrier.

The present invention also provides a dynamic address management apparatus having a processor, comprising: a first function of dynamically allocating an Internet protocol address in an Internet protocol address area to a mobile host according to an address assignment request; A program for realizing a second function of updating a dynamic domain name system (DNS) to maintain a mapping of a network access identifier (NAI) of the mobile host and the assigned internet protocol address; Provide a computer-readable recording medium for recording.

The present invention also provides a computer readable program having a program for further realizing a third function of dynamically allocating any one of the plurality of home agents to the mobile host when there are a plurality of home agents. Provide a record carrier.

The present invention dynamically assigns an Internet Protocol (IP) address and a home agent to a mobile host by applying Mobile IP to a wireless communication network, and effectively provides a mobile Internet service by using a name resolution method using dynamic DNS updating. As one thing, it has the following characteristics.

The present invention efficiently utilizes limited address resources when applying Mobile Internet Protocol (IP) for supporting Internet Protocol (IP) mobility in a wireless communication network. To this end, in the present invention, the dynamic host configuration protocol (DHCP) is modified and used to suit a wireless communication environment. Dynamic host configuration protocol (DHCP) control messages are basically transmitted and received in a wired network environment. However, in a wireless communication environment where an Internet protocol (IP) address is requested when a wireless channel is established, the use of broadcast type messages is unnecessary. Therefore, in the present invention, an address is dynamically allocated using a control message in a unicast form.

The present invention utilizes the function of a dynamic host configuration protocol (DHCP) relay agent in a state where a dynamic host configuration protocol (DHCP) client daemon is not installed in a mobile packet terminal. ) To obtain the address.

Due to the characteristics of the wireless communication network, each foreign agent is responsible for a separate service area, and each service area may be configured as a separate subnet. In this case, a mobile host connecting to an external agent (FA) in each area may be dynamically assigned an Internet Protocol (IP) address belonging to a corresponding subnet to transmit and receive data packets. Accordingly, the present invention utilizes the dynamic host configuration protocol (DHCP) relay agent function to the Internet protocol in the corresponding subnet for each foreign agent (FA) that the host accesses to any mobile host requesting Mobile IP service. (IP) addresses how addresses can be assigned.

The present invention utilizes two or more home agents (HAs) when additional home agents (HAs) of a mobile Internet protocol (HA) network are required due to an increase in the number of service users. For the sake of performance in terms of mobility support, a method of dynamically allocating an arbitrary home agent (HA) at the time of a mobile IP service attempt is included. Dynamic allocation of home agent (HA) means that if any terminal requests a service by specifying a home internet protocol (IP) address, the home agent's Internet protocol (IP) address is available on the subnet to which the corresponding internet protocol (IP) address belongs. There is a case in which a terminal using an internet protocol (IP) address assignment function or an appropriate home agent (HA) is also assigned when an Internet protocol (IP) address is assigned.

Since the counterpart host communicating with the mobile host cannot know the Internet protocol (IP) address of the mobile host that is dynamically allocated, in the present invention, authorization / authentication / billing (AAA) is performed in the mobile Internet protocol (IP) environment. The server uses the Network Access Identifier (NAI) to identify the subscriber, thus combining the Network Access Identifier (NAI) with the Domain Name System (DNS) and dynamically assigning the Internet Protocol (IP). And, when performing a dynamic domain name system (DNS) update over a secure channel between authorization / authentication / billing (AAA) servers.

According to the present invention, when a mobile host uses an Internet Protocol (IP) address assigned from a visited network, a forward dynamic domain name system (DNS) is included in a domain name system (DNS) of a home domain for name-to-IP address resolution. ), And the domain name system (DNS) of the visited domain includes a function of performing a reverse dynamic domain name system (DNS) update.

As described above, the present invention provides an Internet Protocol (IP) packet service such as a mobile Internet service using Mobile Internet Protocol (Mobile IP) in a wireless communication network such as a digital cellular network, a personal mobile communication network, an IMT-2000, and the like.

To this end, in the present invention, although any host using the Mobile Internet Protocol (Mobiel IP) may be statically assigned a home address in the home network, a temporary Internet protocol (Dynamic Internet Protocol) may be dynamically used only while the service is being used for efficient utilization of insufficient IPv4 addresses. IP address can be assigned and used. In addition, when the mobile terminal attempts to access in a visited network far from the home network, when a home address is allocated from the home network, serious delay and bandwidth waste due to triangular routing may occur. This problem is solved by allowing a home address and a home agent (HA) to be dynamically allocated from the visited network. If the mobile host's Internet Protocol (IP) address is dynamically assigned, the role of the Internet Protocol (IP) address as a unique identifier is lost.

The present invention maps a mobile host's name and an Internet Protocol (IP) address through a dynamic domain name system (DNS) update to use a domain name system (DNS) name as an identifier of the mobile host. In addition, the request for the dynamic allocation and release of the Internet Protocol (IP) address of the mobile host is handled by applying the Dynamic Host Configuration Protocol (DHCP) to the wireless network environment, and the name of the mobile host and the Internet protocol (IP) Address mapping uses the Dynamic Domain Name System (DNS) Update feature of Domain Name System (DNS) to dynamically reflect the temporarily assigned Home Internet Protocol (IP) address.

The above objects, features and advantages will become more apparent from the following detailed description taken in conjunction with the accompanying drawings. Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 is an exemplary configuration diagram of a system for explaining interworking between a wireless communication network and a mobile IP network to which the present invention is applied, and includes a wireless data network, a cellular mobile communication network, a personal mobile communication network (PCS), and a next generation mobile communication network. A configuration of a communication system for supporting Internet Protocol (IP) mobility in a wireless communication network such as (IMT-2000, UMTS, etc.) is shown.

As shown in FIG. 1, the system to which the present invention is applied includes a mobile host 11 to 14 connected to a mobile host 11 to 14 through a wireless communication network (eg, a cellular network, a PCS network, an IMT-2000, etc.). 14 Internet based domains divided into Home Domain 20 and Foreign Domain 30 according to the view of mobile host 11-14 to support Dynamic Internet Protocol (IP) address. The protocol includes a mobile IP network, and the home network 20 and the visited network 30 are interworked through an information communication network such as the Internet.

The home network 20 and the visited network 30 have the same configuration, and the home network 20 includes an external agent (FA) 21, 22, a dynamic host configuration protocol (DHCP) server 23, and a domain name system ( DNS (24) server 24, home agent (HA) 25, authorization / authentication / billing (AAA) server 26, and Address Management Server (AMS) (27), the visited network 30 is an external agent (FA) 31, 32, a dynamic host configuration protocol (DHCP) server 33, a domain name system (DNS) server 34, a home agent (HA) 35, authorization / authentication / AAA server 36, and Address Management Server (AMS) 37.

Each mobile host 11-14 has a function included in RFC 2002, and accesses the home network 20 or the visited network 30 through a wireless communication network.

Authorization / authentication / billing servers 26 and 36 perform subscriber authentication, authority verification and billing functions of mobile hosts 11-14 connected via a wireless communication network, and each authorization / authentication / billing (AAA) server 26. 36, a secure channel is formed.

The address management server (AMS) 27,37 performs address management function only for the subscriber authenticated by the authorization / authentication / billing (AAA) server 26,36, and the authorization / authentication / billing (AAA) server ( 26, 36, or a host connected to an authorization / authentication / billing (AAA) server 26, 36 via a secure channel.

The address management server (AMS) 27, 37 dynamically allocates and releases Internet protocol (IP) addresses to the mobile hosts 11-14 in association with the dynamic host configuration protocol (DHCP) servers 23,33, The dynamic domain name system (DNS) server 24, in association with the domain name system (DNS) servers 24, 34, maps the names of the mobile hosts 11-14 to the dynamically assigned Internet Protocol (IP) addresses. Perform the update of 34). A more detailed description thereof will be described later in FIG. 2.

In particular, for the sake of security when updating the dynamic domain name system (DNS) servers 24, 34, the address management server (AMS) 27, 37 and the domain name system (DNS) server 24, It introduces TSIG (Transaction SIGnatures).

2 is a block diagram of an embodiment of a dynamic address management apparatus according to the present invention.

As shown in the figure, the dynamic address management apparatus (address management server) 27, 37 according to the present invention is a dynamic Internet Protocol (IP) address assignment and release, a dynamic home agent assignment, and a dynamic domain name system (DNS). By performing the update function, the address management interface unit 201, the address management request signal processing unit 202, the address management unit 203, the name-address mapping management unit 204, the domain management unit 205, and the data access request processing unit 206. The data access request processing unit 206 is connected to a mobile Internet protocol database 207 for storing information necessary for driving the software .

As shown in FIG. 2, the dynamic address management apparatus according to the present invention includes an address management request signal processor 202 and an address management request signal processor 202 for receiving an Internet address assignment request signal from an external (AAA server). According to the address allocation request signal of the local address, the address manager 203 for dynamically allocating an Internet address, and the name-address mapping for mapping the name of the mobile host with the dynamically allocated Internet address in the address manager 203. The management unit 204, an address management interface unit 201 for interworking with an external address allocation and mapping function supporting server for an address assignment and mapping function, and a domain manager 205 for managing a domain of a mobile host; Data access for processing data access request signals for address allocation from the address manager 203, the name-address mapping manager 204, and the domain manager 205. And a phrase processor 206, data access request processing unit 206, a mobile Internet protocol database 207, for providing a dynamic allocation of the requested information via the Internet address.

The address manager 203 performs a control function for processing a dynamic Internet Protocol (IP) address allocation and release, a dynamic home agent allocation request, and authorizes / authenticates / charges (AAA) servers through external agents 22 and 32. Processes an address assignment request signal received through the address management request signal processing unit 202 from (26, 36), and when a new Internet Protocol (IP) address assignment is required, a dynamic host setting protocol through the address management interface unit 201. (DHCP) servers 23, 33 and domain name system (DNS) servers 24, 34.

In addition, the address manager 203 configures a dynamic host between the mobile host of the subscriber and the external agents 21, 22, 31, 32 connected to the mobile host and the dynamic host configuration protocol (DHCP) server 23, 33. It will act as the protocol relay agent.

Here, in general, dynamic host configuration protocol (DHCP) messages are broadcast in a wired network environment, but in the present wireless network, a link level connection is already established when the mobile host transmits a mobile IP registration message. And a dynamic host in a unicast form by using the address manager 203 to obtain an Internet Protocol (IP) address of the dynamic host configuration protocol (DHCP) servers 23 and 33 from the mobile Internet protocol database 207. Exchange configuration protocol (DHCP) messages.

In addition, the address manager 203 performs a dynamic home agent assignment function. When the Internet protocol (IP) address of the home agents 25 and 35 is not specified in the mobile IP registration message, the address manager 203 assigns the dynamic home agent assignment function. Reference is made to information in mobile Internet protocol database 207 to assign addresses of home agents 25 and 35 that may support the subnet to which the received Internet Protocol (IP) address belongs. In this case, when there are at least two home agents capable of supporting the corresponding subnet, the load of the corresponding home agents 25 and 35 is analyzed to consider appropriate load distribution.

The name-address mapping manager 204 manages the connection between the subscriber's name and the Internet Protocol (IP) address using the mobile host in association with the domain name system (DNS) servers 24 and 24. That is, the mapping of the name-to-address mapping manager 204 converts the Internet Protocol (IP) address of the corresponding subscriber mobile host that is dynamically allocated when any counterpart host attempts communication with the mobile host. 24, 34) to be obtained using the name interpretation method. To do this, domain name system (DNS) servers 24 and 34 must include a dynamic domain name system (DNS) update function.

The domain manager 205 determines which domain any mobile host that has requested address allocation belongs to, and checks whether roaming between the corresponding domain and the domain where the mobile host is currently located is permitted when the mobile host roams from an external network. . Here, roaming between domains is determined by agreement between two service providers providing services, and these matters are stored in the mobile Internet protocol database 207.

The data access request processing unit 206 processes data access requests of the address management unit 203, the name-address mapping management unit 204, and the domain management unit 205 by using the information stored in the mobile Internet protocol database 207. If it is determined that the mobile host requesting the Mobile IP) service does not belong to the roamable domain, the mobile IP registration request is rejected without performing address assignment.

3 is a flowchart illustrating a dynamic address management method for a wireless packet service according to an embodiment of the present invention, in which a mobile host attempts to receive a packet data service such as the Internet by being assigned an Internet Protocol (IP) address of a home network in a home network. Indicates the message procedure to perform.

First, when the mobile host 11 wants to use a packet data service such as the Internet in the home network 20, an external agent ("mobile IP registration request message") currently connected to the mobile host 11 through a wireless communication network ( 21). Then, the foreign agent 21 transmits the received " mobile IP registration request message " to the authorization / authentication / billing (AAA) server 26 (301).

Thereafter, the authorization / authentication / billing (AAA) server 26 authenticates the mobile host 11, and in this case, the mobile host 11 uses the Internet protocol (IP) address of the home network 20. Since it is assumed, the authorization / authentication / billing (AAA) server 26 of the home network 20 transmits an “address assignment request message” to the address management server (AMS) 27 in charge of address management (303). The address management server (AMS) 27 receiving the "address assignment request message" allocates an Internet Protocol (IP) address for use by the mobile host 11 in association with the dynamic host configuration protocol (DHCP) server 23 ( 304).

That is, the address management server (AMS) 27 refers to the "address assignment request message" and the shape information of the network previously stored in the mobile Internet protocol database 207, and the Internet protocol of the dynamic host configuration protocol (DHCP) server 23 Obtains an IP address and generates a unicasting-based "DHCP DISCOVER message" and is assigned an Internet Protocol (IP) address belonging to a specific subnet controlled by the home agent 25 connected to the mobile host 11 Use the subnet selection option of Dynamic Host Configuration Protocol (DHCP).

Next, upon successful assignment of an Internet Protocol (IP) address, the address management server (AMS) 27 associates with the domain name system (DNS) server 24 an assigned dynamic Internet Protocol (IP) address. 11) and the name of the map (305). At this time, if the mobile host 11 does not specify a home agent in the "mobile IP registration request message", the address management server (AMS) 27 selects (assigns) an available home agent 25 (306). When transmitting the "address assignment response message", the corresponding address is transmitted to the authorization / authentication / billing (AAA) server 26 together with the assigned Internet protocol (IP) address (307).

Subsequently, the authorization / authentication / billing (AAA) server 26 that receives the "address assignment response message" sends a "dynamic home agent request message" to the dynamically assigned home agent 25 (308), and the home agent In operation 25, after generating binding information for the mobile host 11 (309), and as a result, transmits a "dynamic home agent response message" to the authorization / authentication / billing (AAA) server 26 (310). .

Thus, authorization / authentication / billing (AAA) server 26 is associated with an address management server (AMS) 27 to provide dynamic Internet Protocol (IP) address assignment and dynamic domain name system (DNS) for mobile host 11. After the server update and dynamic home agent assignment is normally processed (of course, the subject of the processing is the address management server (AMS) 27), the "mobile IP registration response message" is accessed through the home agent 25 and the wireless communication network. The transmitted data is transmitted to the mobile host 11 (311).

Accordingly, the mobile host 11 assigned the Internet Protocol (IP) address through the above process may perform packet data service with any mobile host through an information communication network such as the Internet.

4 is a flowchart of another embodiment of a dynamic address management method for a wireless packet service according to the present invention, in which a mobile host is assigned an Internet Protocol (IP) address of a home network in a visited network to receive a packet data service such as the Internet. Indicates the message procedure to perform.

First, the mobile host 14 moves from the home network 20 to the visited network 30, and then, when attempting to use a packet data service such as the Internet, sends a "mobile IP registration request message" through the wireless communication network. It transmits to the external agent 32 of the visited network 30 to which 14 is connected. Then, the foreign agent 32 transmits the received " mobile IP registration request message " to the authorization / authentication / billing (AAA) server 36 of the visited network 30 (401).

Subsequently, the authorization / authentication / billing (AAA) server 36 of the visited network 30 sends a “mobile IP registration request message” and its own address (visit AAA address) to the home network 20 to which the corresponding mobile host 14 belongs. In step 402, an authorization / authentication / billing (AAA) server 26 transmits a predetermined security channel.

Subsequently, the authorization / authentication / billing (AAA) server of the home network 20 that receives the “Mobile IP registration request message” from the authorization / authentication / billing (AAA) server 36 of the visited network 30 via a secure channel ( 26 authenticates the mobile host 14 (403), and if successful, determines the area of the Internet Protocol (IP) address that the mobile host 14 will use dynamically (404). That is, it is determined whether the mobile host 14 uses the internet protocol (IP) address of the home network 20 or is assigned an internet protocol (IP) address in the visited network 30.

Here, if the mobile host 14 uses the Internet Protocol (IP) address of the home network 20, the authorization / authentication / billing (AAA) server 26 of the home network 20 is responsible for address management A Dynamic Host Configuration Protocol (DHCP) is transmitted from the Address Management Server (AMS) 27 that receives the " Address Assignment Request Message " to the Address Management Server (AMS) 27 (405). The server 23 assigns an Internet Protocol (IP) address for use by the mobile host 14 (406).

That is, the address management server (AMS) 27 refers to the "address assignment request message" and the shape information of the network previously stored in the mobile Internet protocol database 207, and the Internet protocol of the dynamic host configuration protocol (DHCP) server 23 Obtains an IP address and generates a unicasting-based "DHCP DISCOVER message" and is assigned an Internet Protocol (IP) address belonging to a specific subnet controlled by the home agent 25 connected to the mobile host 11 Use the subnet selection option of Dynamic Host Configuration Protocol (DHCP).

Next, upon successful assignment of an Internet Protocol (IP) address, the address management server (AMS) 27 associates with the domain name system (DNS) server 24 an assigned dynamic Internet Protocol (IP) address. 14) and the name (step 407). At this time, the address management server (AMS) 27 selects (assigns) an available home agent 25 if the mobile host 14 does not specify a home agent in the " mobile IP registration request message " In operation 409, the corresponding address is transmitted to the authorization / authentication / billing (AAA) server 26 along with the assigned Internet Protocol (IP) address of the mobile host 14.

Subsequently, the authorization / authentication / billing (AAA) server 26 that receives the "address assignment response message" sends a "dynamic home agent request message" to the dynamically assigned home agent 25 (410), and the home Agent 25 generates binding information for mobile host 14 (411) and, as a result, sends a "dynamic home agent response message" to authorization / authentication / billing (AAA) server 26 (412). ).

Thus, authorization / authentication / billing (AAA) server 26 is associated with an address management server (AMS) 27 to provide dynamic Internet Protocol (IP) address assignment and dynamic domain name system (DNS) for mobile host 14. After server update and dynamic home agent assignment are processed normally (of course, the subject of the process is the address management server (AMS) 27), the " mobile IP registration response message " In step 413, the authorization / authentication / billing (AAA) server 36 located at the server 410 is transmitted.

Then, the authorization / authentication / billing (AAA) server 36 of the visited network 30 transmits the received “mobile IP registration response message” to the external agent 32 and the mobile host 14 connected via the wireless communication network. (413).

Accordingly, the mobile host 14 assigned the Internet Protocol (IP) address through the above process may perform packet data service with any mobile host through an information communication network such as the Internet.

FIG. 5 is a flowchart illustrating a dynamic address management method for a wireless packet service according to an embodiment of the present invention, and is a message procedure when a mobile host moving to a visited network wants to be assigned an IP address in the visited network. Indicates.

Here, the dynamic Internet Protocol (IP) address and home agent assignment procedure of the visited network 30 may include an address management server (AMS) 37, a dynamic host configuration protocol (DHCP) server 33, and a domain in the visited network 30. It is similar to the procedure performed in the home network 20 of FIG. 4 described in connection with the name system (DNS) server 34 and the home agent 35.

First, the mobile host 14 moves from the home network 20 to the visited network 30, and then, when attempting to use a packet data service such as the Internet, sends a "mobile IP registration request message" through the wireless communication network. It transmits to the external agent 32 which 14 is connected to. Then, the foreign agent 32 transmits the received " mobile IP registration request message " to the authorization / authentication / billing (AAA) server 36 on which the address management server (AMS) 37 is mounted (501).

Subsequently, the authorization / authentication / billing (AAA) server 36 of the visited network 30 sends a “mobile IP registration request message” and its own address (visit AAA address) to the home network 20 to which the corresponding mobile host 14 belongs. C) to the authorization / authentication / billing (AAA) server 26 (502). Subsequently, the authorization / authentication / billing (AAA) server 26 of the home network 20 authenticates the mobile host 14 (503), and upon successful authentication, the Internet protocol that the mobile host 14 dynamically uses. (504) An area of the IP address is determined (504). That is, it is determined whether the mobile host 14 uses the internet protocol (IP) address of the home network 20 or is assigned an internet protocol (IP) address in the visited network 30. In other words, it is verified with reference to the user profile that it is authorized to use the Internet Protocol (IP) address of the visited network 30.

Next, if authentication and authority verification for the mobile host 14 is successful, the authorization / authentication / billing (AAA) server 26 of the home network 20 is the authorization / authentication / billing (AAA) of the visited network 30. The server 36 instructs the mobile host 14 to allocate an Internet Protocol (IP) address of the visited network 30 (505).

As such, since the corresponding mobile host 14 uses the Internet Protocol (IP) address of the visited network 30, the authorization / authentication / billing server 36 of the visited network 30 manages addresses for address management. An address management server (AMS) 37 sends a " address assignment request message " to the server (AMS) 37 and receives this " address assignment request message " 33, the mobile host 14 allocates an Internet Protocol (IP) address for use (507).

The address management server (AMS) 37 receives a corresponding Internet Protocol (IP) address from the dynamic host configuration protocol (DHCP) server 33, and then the domain name system (DNS) server 34 located in the same network. In operation 508, a dynamic reverse domain name system (DNS) update function is performed. That is, the address management server (AMS) 37 maps the allocated dynamic Internet Protocol (IP) address in association with the domain name system (DNS) server 34 to the name of the mobile host 14. At this time, the address management server (AMS) 37 selects (assigns) an available home agent 35 when the mobile host 14 does not specify a home agent in the "mobile IP registration request message" (509). In operation 510, the corresponding address is transmitted to the authorization / authentication / billing (AAA) server 36 together with the assigned Internet Protocol (IP) address of the mobile host 14.

Subsequently, if the authorization / authentication / billing (AAA) server 36 receiving the "address assignment response message" sends a "dynamic home agent request message" to the dynamically assigned home agent 35 (511), the home agent 35 generates binding information for the mobile host 14 (512), and as a result sends a " dynamic home agent response message " to the authorization / authentication / billing (AAA) server 36 (513). .

Thus, authorization / authentication / billing (AAA) server 36 is associated with an address management server (AMS) 37 to provide dynamic Internet Protocol (IP) address assignment and dynamic domain name system (DNS) for mobile host 14. After the server update and dynamic home agent assignment is normally processed (of course, the subject of the process is the address management server (AMS) 37), the "mobile IP registration request message" is sent to the home network 20 of the mobile host 14 It transmits to the authorization / authentication / billing (AAA) server 26 located at 514.

Then, the authorization / authentication / billing (AAA) server 26 of the home network 20 sends a "dynamic DNS update request message" to the address management server (AMS) 27 (511), and the address of the home network 20 Management server (AMS) 27 performs a dynamic forward domain name system (DNS) update function in conjunction with domain name system (DNS) server 24 (516).

As such, when the dynamic forward domain name system (DNS) update function is completed, the authorization / authentication / billing (AAA) server 26 of the home network 20 is the authorization / authentication / billing (AAA) server ( 36, the mobile IP registration response message (517), and the authorization / authentication / billing (AAA) server 36 of the visited network 30 sends the received "mobile IP registration response message" to the external agent. And the mobile host 14 connected through the wireless communication network (518).

Accordingly, the mobile host 14 assigned the Internet Protocol (IP) address through the above process may perform packet data service with any mobile host through an information communication network such as the Internet.

FIG. 6 is an explanatory diagram illustrating an internet protocol (IP) packet communication process and a routing path process of a packet for a wireless packet service according to an embodiment of the present invention, and is visited by a mobile host moving to the visited network shown in FIG. The following shows the transmission procedure and routing path of Internet Protocol (IP) packet data when an Internet Protocol (IP) address is to be allocated in a network.

As shown in Fig. 6, any counterpart host connected to the Internet, i.e., the personal terminal 60, starts communication using the name of the mobile host 14. At this time, in order to interpret the name of the mobile host 14 as an Internet Protocol (IP) address, the cache of the domain name system (DNS) server 24 located in the home network 20 of the mobile host 14 is referred to.

The domain name system (DNS) server 24 of the home network 20 has already mapped the name and Internet protocol (IP) address of the mobile host 14 through the mobile Internet protocol (IP) registration procedure shown in FIG. Since you have a table entry, name resolution is performed using that information. As a result, the personal terminal 60 having obtained the Internet Protocol (IP) address of the mobile host 14 transmits the Internet Protocol (IP) packet to the corresponding Internet Protocol (IP) address. At this time, the Internet Protocol (IP) packet is transmitted to the home agent 35 dynamically allocated through the general Internet Protocol (IP) routing process. The home agent 35 acquires the address of the foreign agent 32 where the mobile host 14 is currently located by searching the binding cache, and then transfers the corresponding Internet Protocol (IP) packet to the address of the external agent 32. Encapsulate and send.

After receiving the encapsulated Internet Protocol (IP) packet, the external agent 32 decapsulates the packet, and then transmits the Internet Protocol (IP) packet to the mobile host 14 through the wireless communication network.

Similarly, when the mobile host is assigned an Internet Protocol (IP) address belonging to the home network 20 and the home agent 25, the actual packet is routed through the same path as the packet path in the Mobile Internet Protocol (IP) environment. The procedure is omitted.

On the other hand, as an application of the present invention, when a mobile host having a Mobile Internet Protocol (Mobile IP) function supports a plurality of wireless communication methods, the mobile host moves between heterogeneous wireless communication networks having different wireless communication methods. It is apparent that Internet protocol (IP) mobility support is possible at one time according to the present invention.

The method of the present invention as described above may be implemented as a program and stored in a computer-readable recording medium (CD-ROM, RAM, ROM, floppy disk, hard disk, magneto-optical disk, etc.).

The present invention described above is not limited to the stated embodiments and the accompanying drawings, and it is common in the art that various substitutions, modifications, and changes can be made without departing from the technical spirit of the present invention. It will be evident to those who have knowledge of.

As described above, the present invention provides a mobile internet protocol (Mobile IP) service to a wireless communication network such as a wireless data network, a cellular mobile communication network, a personal mobile communication network (PCS), and a next generation mobile communication network (IMT-2000, UMTS, etc.). By applying a separate mobile internet protocol (IP) network, it is possible to provide a mobile internet protocol (Mobile IP service) independent of the structure of the mobile communication network, irrespective of the physical transmission medium, and also applicable to heterogeneous networks The efficiency of the service is improved.

In addition, the present invention can solve the address shortage problem of IPv4 by dynamically assigning an address only when the mobile host needs an Internet Protocol (IP) address in order to receive an Internet Protocol (IP) packet service. Allocation can minimize the delay caused by triangular routing.

In addition, the present invention, by unicasting a dynamic host configuration protocol (DHCP) message broadcasted at the time of dynamic address allocation through the address management server (AMS), it is possible to prevent the waste of power and network bandwidth of the mobile host, dynamic domain By introducing the name (DNS) renewal function in conjunction with the dynamic domain name (DNS) server, the mobile host can operate in server mode, thereby increasing the efficiency of the system.

In addition, the present invention can be roaming during communication by using the assigned dynamic address, and has the excellent effect that the packet can be transmitted and received through the optimized path using the dynamic home agent (HA) configuration function.

Claims (31)

In the wireless packet service method in a wireless communication network, When the mobile host is accessed, determining a region of an Internet Protocol (IP) address that is to be dynamically allocated; A second step of dynamically allocating an internet protocol address in the determined internet protocol address range to the mobile host; Updating a dynamic domain name system (DNS) to maintain a mapping between a network access identifier (NAI) of the mobile host and the assigned internet protocol address; A fourth step of resolving a name of the mobile host using the dynamic domain name system to obtain the dynamically allocated internet protocol address according to a communication request using the name of the mobile host from any counterpart host; And A fifth step of transferring the obtained internet protocol address to the counterpart host so that the counterpart host transmits a packet to the counterpart host using the internet protocol address; Wireless packet service method comprising a. The method of claim 1, A sixth step of dynamically allocating any one of the plurality of home agents to the mobile host when there are a plurality of home agents Wireless packet service method further comprising. The method of claim 2, The sixth step, A seventh step of dynamically allocating a home agent of the home network to the mobile host connected to the home network; And An eighth step of dynamically allocating a home agent of the visited network to the mobile host connected to the visited network; Wireless packet service method comprising a. The method of claim 3, wherein The sixth step, A ninth step of dynamically allocating a home agent of the home network to the mobile host connected to the visited network; Wireless packet service method further comprising. The method of claim 4, wherein The nine steps, A tenth step in which the address management server of the home network receives the address of the authorization / authentication / billing (AAA) server of the visited network from the authorization / authentication / billing (AAA) server of the home network; An eleventh step of the address management server of the home network determining a subnet for allocating a home agent address of the home network to a visited subscriber connected to the visited network; A twelfth step of obtaining, by the address management server of the home network, an address of a home agent capable of serving the subnet from a mobile IP database; And A thirteenth step by which the address management server of the home network transfers the obtained home agent address to an authorization / authentication / billing (AAA) server of the home network; Wireless packet service method comprising a. The method of claim 3, wherein The seventh step, A ninth step in which the address management server of the home network receives an address of an external agent from an authorization / authentication / billing (AAA) server of the home network; A tenth step of obtaining, by the address management server of the home network, an available home agent address from a mobile IP database by using the address of the external agent; and An eleventh step of delivering, by the address management server of the home network, the obtained home agent address to the authorization / authentication / billing (AAA) server of the home network; Wireless packet service method comprising a. The method of claim 3, wherein The eighth step, A ninth step in which the address management server of the visited network receives the address of the external agent from the authorization / authentication / billing (AAA) server of the visited network; A tenth step of the address management server of the visited network determining a subnet for assigning a home agent address of the visited network to a visited subscriber connected to the visited network; An eleventh step of obtaining, by the address management server of the visiting network, an address of a home agent capable of serving the subnet from a mobile IP database; And Step 12, the address management server of the visited network delivers the obtained home agent address to the authorization / authentication / billing (AAA) server of the visited network. Wireless packet service method comprising a. The method according to any one of claims 1 to 7, The second step, A fourteenth step of allocating a dynamic IP address of the home network to the mobile host connected to the home network; And A fifteenth step of allocating a dynamic IP address of the visited network to the mobile host connected to the visited network; Wireless packet service method comprising a. The method of claim 8, The second step, A sixteenth step of allocating a dynamic IP address of the home network to the mobile host connected to the visited network; Wireless packet service method further comprising. The method of claim 9, The sixteenth step, A seventeenth step in which the address management server of the home network receives the address of the authorization / authentication / billing (AAA) server of the visited network from the authorization / authentication / billing (AAA) server of the home network; An eighteenth step of the address management server of the home network to determine a subnet for allocating an IP address of a home network to a mobile host connected to the visited network; A nineteenth step in which the address management server of the home network operates as a dynamic host configuration protocol (DHCP) relay agent to dynamically allocate an IP address from the dynamic host configuration protocol (DHCP) server; And Step 20, the address management server of the home network transmits the allocated dynamic IP address to the authorization / authentication / billing (AAA) server of the home network; Wireless packet service method comprising a. The method of claim 8, The 14 step, A sixteenth step in which the address management server of the home network receives an address of an external agent from an authorization / authentication / billing (AAA) server of the home network; A seventeenth step in which the address management server of the home network operates as a dynamic host configuration protocol (DHCP) relay agent to dynamically allocate an IP address from the dynamic host configuration protocol (DHCP) server; And An eighteenth step of the address management server of the home network to transmit the allocated dynamic IP address to the authorization / authentication / billing (AAA) server of the home network; Wireless packet service method comprising a. The method of claim 8, The fifteenth step, A sixteenth step in which the address management server of the visited network receives the address of the external agent from the authorization / authentication / billing (AAA) server of the visited network; A seventeenth step in which the address management server of the visited network operates as a dynamic host configuration protocol (DHCP) relay agent to dynamically allocate an IP address from the dynamic host configuration protocol (DHCP) server; And An eighteenth step of the address management server of the visited network transmitting the allocated dynamic IP address to the authorization / authentication / billing (AAA) server of the visited network; Wireless packet service method comprising a. The method according to any one of claims 1 to 7, The third step, And the address management server performs a dynamic DNS update using a network access identifier (NAI) of the mobile host and the assigned IP address. The method according to any one of claims 1 to 7, The first step is, Determining whether the mobile host is a home network of the mobile host when the mobile host is accessed; As a result of the determination in step 14, if the home network is the home network authorization / authentication / billing (AAA) server after authenticating the mobile host, the Internet protocol to be used dynamically from the mobile IP database using the network access identifier of the subscriber A fifteenth step of obtaining an area of an (IP) address; As a result of the determination in step 14, if it is a visited network, it requests a registration to the home network, and after the authorization / authentication / billing (AAA) server of the home network authenticates the mobile host, an Internet protocol (IP) address to be used dynamically. Determining a region of the sixteenth step; As a result of the determination in step 16, when the Internet protocol (IP) address area of the home network is allocated, a seventeenth step of obtaining an area of the Internet protocol (IP) address to be used dynamically from the mobile IP database by using the network access identifier of the subscriber. step; And As a result of the determination of step 16, in case of the allocation of the IP address area of the visited network, the visited network is instructed to assign an IP address so that the visited network uses the subscriber's network access identifier from the mobile IP database. Eighteenth step to obtain a range of Internet Protocol (IP) addresses to use dynamically Wireless packet service method comprising a. The method according to any one of claims 1 to 7, The IP address assignment process, A wireless packet comprising transmitting a dynamic host configuration protocol (DHCP) DISCOVER message in a unicast form to a dynamic host configuration protocol (DHCP) server by using the shape information of the network obtained from the mobile IP database. Service method. In the Internet address management device, Signal receiving means for receiving an Internet address assignment request signal from the outside; Address assignment means for dynamically allocating an Internet address in accordance with an address assignment request signal from the signal reception means; Name-address mapping management means for mapping a name of a mobile host and an internet address dynamically allocated in the address assignment means; Interlocking means for interworking with an external address allocation and mapping function supporting server for an address allocation and mapping function; Domain management means for managing a domain of the mobile host; Signal processing means for processing a data access request signal for address assignment from the address assignment means, the name-address mapping management means, and the domain management means; And Information storage means for providing the dynamic allocation related information of the requested internet address through the signal processing means Dynamic address management device comprising a. The method of claim 16, The address assignment means, And dynamically assign a home agent to the mobile host. The method according to claim 16 or 17, The name-address mapping management means, And a dynamic domain name service (DNS) update function for maintaining a mapping between the subscriber's network access identifier (NAI) and the assigned internet address when the dynamic address is allocated to the mobile host. The method of claim 18, The domain management means, A dynamic address characterized in that it determines which domain belongs to any mobile host requesting an address assignment, and if the mobile host roams from an external network, checks whether roaming is permitted between the domain and the domain in which the mobile host is currently located. Management device. In the dynamic address management method applied to the dynamic address management device, A first step of dynamically allocating an internet protocol address in an internet protocol address area to a mobile host according to an address assignment request; A second step of updating a dynamic domain name system (DNS) to maintain a mapping between a network access identifier (NAI) of the mobile host and the assigned internet protocol address; Dynamic address management method comprising a. The method of claim 20, A third step of dynamically allocating one home agent of the plurality of home agents to the mobile host when there are a plurality of home agents Dynamic address management method further comprising. The method of claim 21, The third step, A fourth step of dynamically allocating a home agent of the home network to the mobile host connected to a home network; And A fifth step of dynamically allocating a home agent of the visited network to the mobile host connected to the visited network; Dynamic address management method comprising a. The method of claim 22, The third step, A sixth step of dynamically allocating a home agent of the home network to the mobile host connected to the visited network; Dynamic address management method further comprising. The method according to any one of claims 20 to 23, The first step is, A seventh step of allocating a dynamic IP address of the home network to the mobile host connected to the home network; And An eighth step of allocating a dynamic IP address of the visited network to the mobile host connected to the visited network; Dynamic address management method comprising a. The method of claim 24, The first step is, A ninth step of allocating a dynamic IP address of the home network to the mobile host connected to the visited network; Dynamic address management method further comprising. The method according to any one of claims 20 to 23, The second step, And the address management server performs a dynamic DNS update using a network access identifier (NAI) of the mobile host and the assigned IP address. The method according to any one of claims 20 to 23, The IP address assignment process, Dynamic address, characterized in that to transmit a dynamic host configuration protocol (DHCP) DISCOVER message in the form of unicast to the dynamic host configuration protocol (DHCP) server using the network shape information obtained from the mobile IP database How to manage. In a wireless communication network having a processor, A first function of determining, when the mobile host is accessed, an area of an Internet Protocol (IP) address that is to be dynamically allocated; A second function for dynamically allocating an internet protocol address in the determined internet protocol address area to the mobile host; A third function of updating a Dynamic Domain Name System (DNS) to maintain a mapping of a Network Access Identifier (NAI) of the mobile host and the assigned Internet Protocol address; A fourth function of resolving a name of the mobile host using the dynamic domain name system to obtain the dynamically assigned internet protocol address according to a communication request using the name of the mobile host from any counterpart host; And A fifth function of transferring the obtained internet protocol address to the counterpart host so that the counterpart host transmits a packet to the counterpart host using the internet protocol address; A computer-readable recording medium having recorded thereon a program for realizing this. The method of claim 28, A sixth function of dynamically allocating any one of the plurality of home agents to the mobile host when there are a plurality of home agents A computer-readable recording medium that records a program for further realization. In a dynamic address management device having a processor, A first function of dynamically allocating an Internet protocol address in an Internet protocol address area to a mobile host according to an address assignment request; A second function of updating a dynamic domain name system (DNS) to maintain a mapping of a network access identifier (NAI) of the mobile host and the assigned internet protocol address; A computer-readable recording medium having recorded thereon a program for realizing this. The method of claim 30, A third function of dynamically allocating a home agent of any of the plurality of home agents to the mobile host when there are a plurality of home agents A computer-readable recording medium that records a program for further realization.