KR20030057653A - Dynamic address allocation of home agent in packet data network - Google Patents

Abstract

PURPOSE: A method for allocating a dynamic address of a home agent in a packet data network is provided to allocate a home address through the home agent by considering the load of plural local processors when requesting registration of a mobile terminal in an IMT 200 packet network. CONSTITUTION: A mobile terminal(310) is connected to a packet network, then performs a packet exchange and receives an IP allocation to a node connected to itself and can relay the packet to a notebook computer etc. connected to itself. A wireless network controller(320) is connected to the mobile terminal(310) through a wireless network and then transmits the exchanged packet. An outside agent(330) is implemented by a PDSN system and the like and connected to an AAA(Administration, Authorization, and Authentication)(340) in order to manage the subscriber's information for a subscriber authentication and account. The outside agent(330) is positioned at a relatively public network compared to a home agent(200) at a private network on the basis of a home IP network(120).

Description

Dynamic address allocation of home agent in packet data network {Dynamic address allocation of home agent in packet data network}

The present invention relates to home address allocation of a home agent in a packet data network. More particularly, the present invention relates to assigning a home address in consideration of the load of a plurality of local processors when requesting a registration of a mobile station in an IMT2000 packet network. A dynamic address allocation method of a home agent in a packet data network.

In general, for the mobile IP protocol, the mobile node has two IP addresses in order to maintain connection of the transport layer and correct routing of the IP layer. One address is a home address, which is fixed like a general Internet Protocol (IP) address, and is used to distinguish a Transmission Control Protocol (TCP) connection. The other address is a care-of address (COA) that changes at each new connection point, reflecting the actual location of the mobile node, such as a notebook computer.

The mobile node is given a home address from the home network. A home network is a network including a home agent node, usually a private network or a provider network, to which a mobile node is registered. When a node moves and is not connected to the home network but is connected to another network (external network), the home agent receives all packets destined for the mobile node and forwards the packets to the external network to which the mobile node is currently connected.

In mobile IP, the home agent system generates an IP packet header destined for the COA of the mobile node for redirection. The generated header is used as the header of the new IP packet that wraps the original packet. In other words, the mobile node's home address, which is the destination address originally contained in the header of the packet, is included in the payload of the new packet, and has no effect on the routers processing the packet while routing to the COA. In this way, the original packet is wrapped in a new packet for transmission.

IPSec is a protocol for guaranteeing security of all upper layers by ensuring security at the network layer, and related technical matters include RFC2401, RFC2402, RFC2406, RFC2407, and RFC2409.

1 is a block diagram of a home agent 200 system in a general IMT2000 packet data network.

According to FIG. 1, in an IMT2000 packet network, a mobile station recognizes a solicitation request and an external agent 330 (Foreign Agent, or FA agent advertisement message), and then recognizes the movement of a packet zone. (Mobile Internet Protocols) registration is performed, where the mobile station can register using a '0' or a fixed IP address in the home address field of the MIP registration request message. Network) system.

The home agent manager 110 is connected to the home IP network 120, and the home agent 200 connected to the router 130 through the Ethernet line is connected to the home IP network 120. The home agent manager 110 manages the home agent 200, and each home agent 200 has a binding list for the mobile terminal serviced by the home agent 200.

The home agent 200 system manages a mobility binding table using a MIP protocol to support mobility of a mobile station in an IMT2000 packet network, and authenticates the mobile terminal with an external agent 330 system. It performs IPSec function for tunnel with and catches data destined for IP address assigned to mobile station from packet network and tunnels to corresponding COA.

In order to support such a function, the home agent 200 may include a main processor 240 that performs MIP signaling, authentication, IPSec negotiation, and overall binding table management, and a plurality of local processors that manage routing, tunneling, IPSec, and local binding tables. 220, an internal packet controller 230 for controlling packet exchange between the plurality of local processors 220 and the main processor 240, and a hub 210 for switching data exchanged by being connected to an Ethernet line. It is configured by.

However, according to the prior art, when the MIP registration request of the mobile terminal, the home agent may be randomly allocated among idle (Idle) subnet IP, so that the load may be concentrated on some local processors. In other words, the home agent does not dynamically allocate a home address considering the load of each local processor performing routing table, IPSec, and encapsulation, but simply allocates among idle subnet IPs, so the load is concentrated on some local processors. There was a possibility that a phenomenon would occur.

The present invention has been made to solve the above-mentioned conventional problems, and an object of the present invention is to allow a home agent to allocate a home address in consideration of the load of a plurality of local processors when requesting registration of a mobile station in an IMT2000 packet network. It is to provide a dynamic address allocation method of a home agent in a data network.

In the packet data network of the present invention for achieving the above object, the dynamic address allocation method of the home agent comprises the steps of: managing information about each system resource state in the home agent by the home agent manager; When the mobile terminal issues a MIP registration request for the first time, confirming whether the MIP registration request is a registration request of an authenticated subscriber; If it is determined that the MIP registration request is issued from an authenticated subscriber, responding to the MIP registration request with an idle subnet IP belonging to any one local processor in consideration of system resources in the managed home agent; And forming a data transmission path between the local processor in the home agent and the mobile terminal in response to the MIP registration request.

1 is a block diagram of a home agent system in a typical IMT2000 packet data network.

2 is a block diagram of a packet data network to which an embodiment of the present invention is applied.

3 is a flowchart of a method for dynamically allocating a home agent in a packet data network according to an embodiment of the present invention.

4 is a flowchart of a MIP registration process according to an embodiment of the present invention.

Explanation of symbols on the main parts of the drawings

110: home agent manager 120: home IP network

130: router 200: home agent

210: hub 220: local processor

230: internal packet controller 240: main processor

310: mobile terminal 320: wireless network controller

330: external agent 340: AAA

Hereinafter, exemplary embodiments of the present invention will be described with reference to the accompanying drawings.

2 is a block diagram of a packet data network to which an embodiment of the present invention is applied, and FIG. 3 is a flowchart of a dynamic address allocation method of a home agent in a packet data network according to an embodiment of the present invention, and FIG. 4 is an embodiment of the present invention. A flowchart of a MIP registration process according to an example.

In the present embodiment, the main processor detects the load of the local processor in the home agent in the packet data network such as IMT2000, delivers the information about the load to the home agent manager, and manages the local processor when requesting the MIP registration of the mobile terminal. In consideration of the load, the home address is allocated to be optimal for load balancing.

Referring to the system configuration to which the present embodiment is applied, as shown in FIG. 2, the mobile terminal 310 (Mobile Station), the radio network controller 320 (Radio Network Controller, or RNC), the external agent 330 (FA) ), Home agent 200 (HA), and AAA 340 (Authorization, Authentication, and Accounting).

The mobile terminal 310 accesses the packet network and performs packet exchange, and receives the IP for the node to which the mobile terminal 310 is connected, and relays the packet to a laptop computer connected to the mobile terminal. In addition, the wireless network controller 320 connects with the mobile terminal 310 through a wireless link and transmits a packet to be exchanged.

The external agent 330 is implemented as a Packet Data Serving Node (PDSN) system and the like, and is connected to the AAA 340 configured to manage subscriber information for subscriber authentication and billing. The external agent 330 is located on the public network side relative to the home agent 200 located on the private network side based on the home IP network 120.

The home agent manager 110 and the home agent 200 are connected to the private IP network. The home agent manager 110 is for managing the home agent 200. The home agent 200 is usually connected to the home IP network 120 through an Ethernet line to provide an IP address for the subscriber's mobile terminal 310. Function to assign. The subscriber may selectively access the private IP network to which the home agent 200 is connected to receive packet service, or may access the private IP network through the external agent 330 from an external network to receive the service.

An internal configuration of the home agent 200 is as described above with reference to FIG. 1.

A method of achieving processor load balancing in the home agent 200 according to the system configuration will be described in time series.

According to FIG. 3, the main processor 240 receives and manages an IP address, a subnet IP, a subnet mask, and the like, required by the home agent manager 110 when a plurality of local processors 220 interface with a packet network. In addition, the information is transmitted to the local processor 220 through the internal packet controller 230 (S31).

In addition, the local processor 220 may monitor the status of resources such as process occupancy of all the processors constituting the home agent 200, the number of failures and successes for the registration request, routing errors, IPSec violations, and traffic to and from the packet network. Investigate periodically and report to the main processor 240 (S32).

Then, the main processor 240 checks various information about the state of the system resource reported by the internal packet control and reports the system resource state to the home agent manager 110 (S33).

Here, the subnet IP address assigned to each local processor 220 is an IP address allocated when the mobile terminal 310 newly issues a MIP registration request.

A procedure of performing registration according to the MIP registration request of the mobile terminal 310 will be described in detail with reference to the flow of FIG. 4.

First, a procedure that needs to be performed before the mobile terminal 310 issues a MIP registration request is required. That is, an access network procedure is performed between the mobile terminal 310 and the wireless network controller 320 to form an access network. Subsequently, a link connection is made between the radio network controller 320 and the external agent 330. Then, a Point-to-Point Protocol (PPP) connection is installed between the mobile terminal 310 and the external agent 330 (S34 to S36).

As a result, the mobile terminal 310 can accept the MIP registration request.

When the MIP registration request is issued in the mobile terminal 310, the request is transmitted to the external agent 330 through the PPP connection (S37).

The external agent 330 receiving the MIP registration request requests the AAA 340 for subscriber information using the corresponding mobile terminal 310. In other words, the subscriber authentication is requested. It is natural that the subsequent registration procedure is performed only when it is confirmed that the subscriber is a registered subscriber in this authentication (S38).

When the subscriber authentication response is received from the AAA 340, the external agent 330 issues a MIP registration request of the corresponding mobile terminal 310 to the home agent 200 through the home IP network 120 (S39, S40). ).

The home agent 200 receiving the MIP registration request of the mobile terminal 310 checks the load of the local processor 220 and selects the local processor 220 having an appropriate load. At this time, the selection of the local processor 220 is an operation for selecting a processor having a minimum load or a relatively low load, as described above. If necessary or in accordance with embodiments, the main processor 240 may provide the home agent manager 110 with system resource state information including information on the load of each local processor 220 in place of the load check of the local processor 220. The request may be determined (S41).

When the local processor 220 suitable for load balancing is determined, the IP address of the mobile terminal 310 is registered in the corresponding local processor 220 of the home agent 200, and service provision is performed by the local processor 220. The MIP registration response is sent to the external agent 330 to make it happen. This MIP registration response is delivered to the mobile terminal 310 via the external agent 330 (S42).

After the MIP registration is performed as described above, data exchange is possible with each PC or hosts connected on the mobile terminal 310 and the home IP network 120.

That is, in the present embodiment, when the mobile terminal 310 issues a MIP registration request for the first time, the main processor 240 loads the load of the local processor 220 such as the share of the processor, the subnet IP share, and the amount of transmission / reception traffic. Considering this, the idle subnet IP of the local processor 220 having a low load is selected and assigned as the home address of the MIP registration response to distribute the load of the local processor 220 and provide a stable service to an active session. It will be possible.

The embodiments described above are within the scope of various changes, modifications, and equivalents of the present invention. Therefore, the present invention is not limited to the description of the examples.

According to the dynamic address allocation method of the home agent in the packet data network of the present invention, the MIP registration response is transmitted to the mobile station requesting the MIP registration to distribute the load that may be concentrated to some local processors when the home agent allocates the dynamic home address. Considering the load on the local processor, it is possible to distribute the load on the local processor and improve the system performance by allocating the subnet IP assigned to the local processor with the less load.

Claims (4)

Setting, by the home agent manager, information about the state of each system resource in the home agent; When the mobile terminal issues a MIP registration request for the first time, confirming whether the MIP registration request is a registration request of an authenticated subscriber; If it is determined that the MIP registration request is issued from an authenticated subscriber, responding to the MIP registration request with an idle subnet IP belonging to any one local processor in consideration of system resources in the managed home agent; And forming a data transmission path between the local processor in the home agent and the mobile terminal in response to the MIP registration request. The method of claim 1, wherein the information about the system resource status in the home agent, An internal packet control means in the home agent indicates a load state of each local processor, wherein the load state of the local processor is determined in consideration of the share of each processor, the subnet IP share, and the amount of transmission and reception traffic. Dynamic address allocation method of home agent in network. The method of claim 1, The local processor responding to the MIP registration request is determined by the main processor in consideration of the load status of each local processor in the home agent, and selects an idle subnet IP and assigns it to the home address of the MIP registration response. A dynamic address allocation method of a home agent in a packet data network. The method of claim 1, wherein when managing information about a system resource state in the home agent, The main processor receives and manages an IP address, subnet IP, subnet mask, etc. required by a plurality of local processors to interface with a packet network from a home agent manager, and the local processor accesses the interface through an internal packet controller. Dynamic address allocation method of a home agent in a packet data network, characterized in that to deliver the necessary information.