KR20050004567A - Method of allocating home agent in wireless communication system - Google Patents

Abstract

PURPOSE: A method for assigning an HA(Home Agent) in a wireless communication system is provided to assign pre-registered plural HAs, so that loads of each HA can be uniform, while assigning HAs except a failed HA by monitoring all the HAs, thereby supplying a smooth mobile IP service. CONSTITUTION: An AAA server registers HAs at an HA table(S300), and monitors the registered HAs(S310) to detect whether a failed HA exists(S320). If not, the AAA server retrieves all registered subscribers, and assigns the registered HAs to all the subscribers(S340). The AAA server stores assigned HA information in a subscriber DB(S350). If an RADIUS accept request message is received from a PDSN(S360), the AAA server retrieves an HA corresponding to a mobile station ID within the RADIUS access request message(S370), and includes the HA information in an RADIUS access response message to transmit the message to the PDSN(S380).

Description

How to assign home agent in wireless communication system {METHOD OF ALLOCATING HOME AGENT IN WIRELESS COMMUNICATION SYSTEM}

The present invention relates to a home agent allocation method in a wireless communication system.

Recently, a mobile IP service has been provided that can maintain communication while maintaining an IP address in use even when moving to another network while accessing an Internet service using a mobile terminal.

A mobile IP service session connection operation in such a wireless communication system will be described in detail with reference to the accompanying drawings.

1 is a block diagram of a wireless communication system for allocating a home agent to perform a conventional mobile IP service.

In FIG. 1, reference numeral 10 denotes a mobile terminal (MS), reference numeral 20 denotes a base station system (BTS / BSC), reference numeral 30 denotes a packet data serving node (PDSN), reference numeral 40 denotes AAA ( The Authentication Authorization and Accounting (Server) server, and reference numeral 60 denotes a home agent (HA), respectively.

The mobile terminal 10 may be used separately, such as a notebook, etc., or may be mixed, such as a wireless application protocol (WAP) terminal.

The mobile terminal 10 may use the same IP address at all times unless the wireless Internet connection is terminated unlike the conventional wireless Internet connection using the mobile IP protocol. That is, even if the mobile terminal 10 moves to another PDSN 30, the home agent 60 can always transmit data to the mobile terminal 10 with the current PDSN information.

The base station system (BTS / BSC) 20 is responsible for transmitting and buffering data between the mobile terminal 10 and the PDSN 30.

The packet data service node (PDSN) 30 establishes a point-to-point protocol (PPP) connection with the mobile terminal 10 and authenticates subscribers via a remote authentication dial-up user service (RADIUS) 50. Deliver billing information.

When providing the mobile IP service, the PDSN 30 performs a foreign agent (FA) function, and the home agent 60 existing in the home network of the mobile terminal 10 IP address is located in the home network. It performs functions such as management and tunnel setup.

The PDSN 30 also receives the subscriber's ID and password and authenticates it to the Remote Authentication Dial-In User Service (RADIUS) 50.

AAA (Authentication Authorization and Accounting) server 50 is responsible for subscriber authentication, authorization verification, billing, and handles authentication requests, billing messages, etc. requested from the PDSN (30), home agent (60) Assign.

After receiving the mobile IP registration request message from the mobile terminal 10, the home agent 60 allows the use of the corresponding IP address when a method of statically assigning an IP address is used. If a dynamically allocated method is used, an IP address is assigned and a mobile IP registration reply message is transmitted to allow this. If the mobile terminal 10 changes the PDSN area, it is always informed to the home agent 60.

2 is a flowchart illustrating a dynamic mobile IP service session connection operation in which an IP address to be used by a conventional mobile terminal is allocated from a home agent.

As shown in FIG. 2, when the mobile terminal 10 transmits an origination message to the base station system 20 (S100), the base station system 20 moves a base station acknowledge order. Transmission to the terminal 10 (S110).

Thereafter, a traffic channel is established between the mobile terminal 10 and the base station system 20 (S120), and the base station system 20 transmits an RP Registration Request message to the packet data service node (PDSN) 30. In step S130, the PDSN 30 registers the number and session information of the mobile terminal 10, and then transmits an RP Registration Reply message to the base station system 20 (S140).

Next, when the PDSN 30 transmits a link control protocol setup request (LCP Configure Request) message to the mobile terminal 10 (S150), it uses CHAP (Challenge Authentication Protocol) or PAP (Password Authentication Protocol). If the mobile terminal 10 is configured to transmit a link control protocol setup unacknowledgement (LCP Configure Noacknowledgement) message to the PDSN 30 (S160), the PDSN 30 again controls the link that lacks an authentication option. When the protocol request (LCP Configure Request) message is transmitted to the mobile terminal 10, the mobile terminal 10 transmits a link control protocol configuration response (LCP Configure Acknowledgement) message to the PDSN (30) in response (S170). ).

Next, when the mobile terminal 10 transmits an IP configuration request (IPCP Configure Request) message to the PDSN 30 without omitting the IP address option (S180), the PDSN 30 responds to the IPCP configuration response ( The IPCP Configure Acknowledgement message is transmitted to the mobile terminal 10 (S190).

As described above, step S150 to step S190 are PPP settings between the mobile terminal 10 and the PDSN 30. When all of these PPP settings are completed, the mobile terminal 10 first selectively selects an external agent request (Agent Solicitation). ) Can be transmitted to the PDSN (30) (S200). The agent request message at this time is a message used when requesting the PDSN 30 to transmit an external agent advertisement message.

Alternatively, when the PDSN 30 first transmits a foreign agent advertisement message to the mobile terminal 10 (S210), the mobile terminal 10 uses the information of the PDSN 30 included in the mobile terminal 10 to send a mobile message. The Mobile IP Registration Request message is transmitted to the PDSN 30 (S220). At this time, the home address field is designated as 0, and the home agent IP address field to be registered by the mobile terminal 10 is also designated as 0.

Subsequently, the PDSN 30 receiving the mobile IP registration request message sends an access request message including a user name (User_Name), a CHAP_password (CHAP_Password), a CHAP_Challenge, and a NAS_IP_Address to the AAA server. (See FIG. 1; 40) to the remote authentication dial-up user service (RADIUS) 50 (S230). Thereafter, the RADIUS 50 that receives the authentication request message transmits the home agent IP address to the PDSN 30 in the access accept message to allow access after successful authentication (S240).

Thereafter, the PDSN 30 receiving the access acceptance message from the RADIUS 50 transmits the mobile IP registration request message received in step S220 to the home agent 60 (S250). In contrast, when the home agent 60 receives the mobile IP registration request message from the PDSN 30, the home agent 60 registers the IP address of the mobile terminal 10, the IP address of the PDSN 30, and the requested lifetime. The mobile IP registration reply message is transmitted to the PDSN 30 (S260).

Then, the PDSN 30 receiving the mobile IP registration response message from the home agent 60 transmits it to the mobile terminal 10 (S270).

In addition, the PDSN 30 receives the user data, and includes the charging information of the wireless network and the charging information of the wired network in the UDR and transmits the data to the RADIUS 50 at a specified time or at a designated time so that the billing can be made correctly. (S280).

As such, when the AAA server (see FIG. 1) 40 receives an access request message from the PDSN 30, the AAA server performs a necessary authentication and authority verification and allocates a home agent to be used.

However, in the prior art, there was no method of distributing calls in proportion to the capacity of the home agent in the process of allocating the home agent in the AAA server, and there was no method of quickly excluding / injecting the service in case of failure or recovery of the home agent. .

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and by registering a plurality of home agents to be allocated by the AAA server in advance and allocating a home agent, the load applied to each home agent by efficiently allocating a plurality of home agents to the capacity Providing a home agent allocation method in a wireless communication system to provide a mobile IP service by uniformly proportionately and monitoring home agents in operation and allocating other home agents except a failed home agent. For the purpose of

1 is a block diagram of a wireless communication system for allocating a home agent to perform a conventional mobile IP service.

2 is a flowchart illustrating a dynamic mobile IP service session connection operation in which an IP address to be used by a conventional mobile terminal is allocated from a home agent.

3 is a flowchart illustrating an operation of allocating a home agent and storing in a subscriber database in a wireless communication system according to an embodiment of the present invention.

4A and 4B are flowcharts illustrating an operation of allocating a home agent when receiving a RADIUS connection request message in a wireless communication system according to another embodiment of the present invention and including the same in a RADIUS connection accept message.

(Explanation of symbols for the main parts of the drawing)

10: mobile terminal 20: base station system (BTS / BSC)

30: Packet data service node (PDSN)

40: Authentication Authorization and Accounting (AAA) Server

50: Remote Authentication Dial-up User Service (RADIUS)

60: Home Agent

In order to achieve the above object, the present invention provides a method for allocating a home agent in a wireless communication system, and registers a plurality of home agents to be assigned by an AAA server in a home agent table of the AAA server and registers a failed home agent in the home agent table. Removing from the agent table; And assigning, by the AAA server, a home agent registered in the home agent table for all subscribers registered in the mobile IP service.

Furthermore, the present invention provides a method for allocating a home agent in a wireless communication system, comprising registering a plurality of home agents to be assigned by an AAA server in a home agent table of the AAA server, and removing a failed home agent from the home agent table. step; And when the AAA server receives a RADIUS connection request message from a packet data service node, assigning a home agent for a mobile terminal ID (MSID) in the RADIUS connection request message.

The present invention also provides a method for allocating a home agent in the wireless communication system, wherein a plurality of home agents to be allocated by the AAA server are registered in a home agent table of the AAA server, and a failed home agent is registered in the home agent table. The removing may include registering a home agent to be assigned by the AAA server in a home agent table of the AAA server; Monitoring, by the AAA server, the registered home agent to detect whether a failed home agent exists; And removing, by the AAA server, the failed home agent from the home agent table.

The present invention also provides a method for allocating a home agent in the wireless communication system, wherein the step of removing, by the AAA server, the failed home agent from the home agent table, the AAA server identifies the failed home agent. And deleting from the home agent table.

The present invention also provides a method for allocating a home agent in the wireless communication system, wherein the step of removing, by the AAA server, the failed home agent from the home agent table may include the failure of the AAA server in the home agent table. Whether or not the generated home agent is operated is set to 'NO'.

The present invention also provides a method for allocating a home agent in the wireless communication system, wherein the step of assigning a home agent registered in the home agent table to all subscribers registered in a mobile IP service is performed by the AAA server. Allocating a home agent registered in the home agent table for all subscribers registered in the mobile IP service; Storing, by the AAA server, the allocated home agent information in a subscriber database; Receiving, by the AAA server, a subscriber authentication request message transmitted from a packet data service node (PDSN) and retrieving a home agent corresponding to a mobile terminal ID (MSID) in the subscriber authentication request message from the subscriber database; And including home agent information corresponding to the MSID in a subscriber authentication success message to the PDSN.

In addition, the present invention provides a method for allocating a home agent in the wireless communication system, wherein the step of assigning the home agent registered in the home agent table to all subscribers registered in the mobile IP service by the AAA server comprises: the MSID; And a home agent registered in the home agent table by using the number of home agents registered in the home agent table.

In addition, the present invention provides a method for allocating a home agent in the wireless communication system, wherein when the AAA server receives a RADIUS access request message from a packet data service node, the home agent is assigned to a mobile terminal ID (MSID) in the RADIUS access request message. The assigning step may include: identifying, by the AAA server, whether the RADIUS connection request message is transmitted from the packet data service node; The AAA server assigning a home agent for the mobile terminal ID in the received RADIUS connection request message; And sending, by the AAA server, the allocated home agent information to the packet data service node by including the allocated home agent information in a RADIUS access acceptance message.

The present invention also provides a method for allocating a home agent in the wireless communication system. The home agent registered in the home agent table may be allocated using the number of registered home agents.

The present invention also provides a home agent allocation method in the wireless communication system, wherein the home agent table includes a home agent name and a home agent IP address, and the home agent table includes an operating percentage of the home agent and the home agent. Characterized in that it further comprises at least one or more of the operation.

EMBODIMENT OF THE INVENTION Hereinafter, the Example of this invention is described in detail, referring drawings.

3 is a flowchart illustrating an operation of allocating a home agent and storing in a subscriber database in a wireless communication system according to an embodiment of the present invention.

In FIG. 3, the AAA server registers a home agent to be allocated to the home agent table of the AAA server (S300). For example, if the number of home agents to be allocated by the AAA server is three, the home agent is registered in the home agent table as shown in Table 1.

Index Home Agent name IP Address Operating percentage (optional) Operational status (optional) 0 HA_ # 1 1.1.1.1 30 Yes One HA_ # 2 2.2.2.2 40 Yes 2 HA_ # 3 3.3.3.3 30 Yes

When the home agent is registered in the home agent table as shown in Table 1, the AAA server monitors the home agent registered in the home agent table (S310), and detects whether there is a failed home agent (S320).

If there is a failed home agent in step S320, in step S390, the AAA server removes the failed home agent from the home agent table. At this time, as a method of removing a failed home agent from the home agent table, the failed home agent is deleted from the home agent table, or whether the failed home agent is operated in the home agent table is registered as 'No'. .

If there is no failed home agent in step S320, in step S330, the AAA server searches for all subscribers registered in the mobile IP service, and the home agent registered in the home agent table for all subscribers registered in the mobile IP service. To allocate (S340). For example, if the subscriber's mobile terminal ID (MSID) is xxx-xxxx-xx11 and the number of home agents currently in operation is three, the corresponding function in the home agent table using a hash function, in particular, a modular operation, is applied. Assign a home agent.

Example) MSID = xxx-xxxx-xx11

Active Home Agents = 3

Home Agent Index = Hash Function (11, 3) = 11% 3 = 2

Home Agent IP Address to be Assigned = 3.3.3.3

In this embodiment, the home agent is allocated using only the last two digits of the MSID. However, the home agent is not limited thereto, and the home agent may be allocated using more digits of the MSID for even distribution. For example, the last 4 digits of the MSID). After allocating home agents to all subscribers in this way, in step S340, the AAA server stores the allocated home agent information in the subscriber database.

In step S360, upon receiving a RADIUS access request message from the packet data service node PDSN, in step S370, the AAA server subscribes to the home agent corresponding to the mobile terminal ID (MSID) in the received RADIUS access request message. In step S380, the AAA server transmits the retrieved home agent information to the packet data service node (PDSN) by including the retrieved home agent information in a RADIUS access response message.

4A and 4B are flowcharts illustrating an operation of dynamically assigning a home agent when a RADIUS access request message is received and including the same in a RADIUS access accept message in a wireless communication system according to another embodiment of the present invention. 4A is a flowchart illustrating an operation of registering and monitoring a home agent, and FIG. 4B is a flowchart illustrating an operation of allocating a home agent.

In FIG. 4A, the AAA server registers a home agent to be allocated to the home agent table of the AAA server as shown in Table 1 (S400).

When the home agent is registered in the home agent table, the AAA server monitors the home agent registered in the home agent table (S410), and detects whether there is a failed home agent (S420).

If there is a failed home agent in step S420, in step S460 the AAA server removes the failed home agent from the home agent table. At this time, as a method of removing a failed home agent from the home agent table, the failed home agent is deleted from the home agent table, or whether the failed home agent is operated in the home agent table is registered as 'No'. .

In FIG. 4B, the AAA server detects whether a RADIUS access request message is received from a packet data service node PDSN (S430).

When the RADIUS access request message is received from the PDSN in step S430, the AAA server allocates a home agent registered in the home agent table using the mobile terminal ID (MSID) in the received RADIUS access request message in step S440. For example, as described in FIG. 3, if the subscriber's mobile terminal ID (MSID) is xxx-xxxx-xx11 and the number of home agents currently in operation is three, a hash function, in particular, a modular operation is used. The corresponding home agent is assigned from the home agent table.

Example) MSID = xxx-xxxx-xx11

Active Home Agents = 3

Home Agent Index = Hash Function (11, 3) = 11% 3 = 2

Home Agent IP Address to be Assigned = 3.3.3.3

Thereafter, the AAA server transmits to the PDSN including the home agent information allocated as described in FIG. 3 in the RADIUS access response message (S450).

In this embodiment, the home agent to be allocated is obtained by using the mobile terminal ID (MSID) of the subscriber registered in the mobile IP service and the number of operating home agents. You can also add to get the home agent to allocate.

As described above, according to the present invention, by registering a plurality of home agents to be assigned by the AAA server in advance and allocating home agents, the load applied to each home agent by efficiently allocating the plurality of home agents in proportion to the capacity By uniformly monitoring the home agents in operation and assigning a home agent other than a failed home agent, the mobile IP service can be smoothly provided.

In the above, the present invention has been described and described with respect to certain preferred embodiments. However, the present invention is not limited to the above-described embodiments, and those skilled in the art to which the present invention pertains have various changes without departing from the spirit of the technical idea of the present invention described in the claims below. Could be done.

Claims (11)

As a home agent assignment method in a wireless communication system: Registering a plurality of home agents to be assigned by an AAA server in a home agent table of the AAA server, and removing a failed home agent from the home agent table; And And assigning a home agent registered in the home agent table to all subscribers registered to a mobile IP service by an AAA server. As a home agent assignment method in a wireless communication system: Registering a plurality of home agents to be assigned by an AAA server in a home agent table of the AAA server, and removing a failed home agent from the home agent table; And And assigning a home agent to a mobile terminal ID (MSID) in the RADIUS connection request message when the AAA server receives a RADIUS connection request message from a packet data service node. The method of claim 1 or 2, wherein the registering of the plurality of home agents to be assigned by the AAA server in the home agent table of the AAA server and removing the failed home agent from the home agent table include: Registering a home agent to be assigned by the AAA server in a home agent table of the AAA server; Monitoring, by the AAA server, the registered home agent to detect whether a failed home agent exists; And And the AAA server removing the failed home agent from the home agent table. 4. The wireless communication method of claim 3, wherein the removing of the failed home agent from the home agent table by the AAA server comprises deleting the failed home agent from the home agent table. 5. How to assign home agents on your system. The method of claim 3, wherein the removing of the failed home agent from the home agent table by the AAA server sets the operation of the failed home agent in the home agent table to 'NO'. Home agent allocation method in a wireless communication system, characterized in that. The method of claim 1, wherein the AAA server assigns a registered home agent to the home agent table for all subscribers registered to a mobile IP service. Assigning, by the AAA server, a home agent registered in the home agent table for all subscribers registered with the mobile IP service; Storing, by the AAA server, the allocated home agent information in a subscriber database; Receiving, by the AAA server, a subscriber authentication request message transmitted from a packet data service node (PDSN) and retrieving a home agent corresponding to a mobile terminal ID (MSID) in the subscriber authentication request message from the subscriber database; And And transmitting the home agent information corresponding to the MSID in the subscriber authentication success message to the PDSN. The method of claim 6, wherein the step of assigning the home agent registered in the home agent table to all subscribers registered in the mobile IP service, the AAA server determines the number of home agents registered in the home agent table. And assigning a home agent registered in the home agent table using the home agent allocation method. 3. The method of claim 2, wherein when the AAA server receives a RADIUS connection request message from a packet data service node, allocating a home agent for a mobile terminal ID (MSID) in the RADIUS connection request message: The AAA server identifying whether the RADIUS connection request message is sent from the packet data service node; The AAA server assigning a home agent for the mobile terminal ID in the received RADIUS connection request message; And And transmitting, by the AAA server, the allocated home agent information to the packet data service node by including the allocated home agent information in a RADIUS connection acceptance message. 10. The method of claim 8, wherein the AAA server assigns a home agent to a mobile terminal ID in the received RADIUS access request message by using the MSID and the number of home agents registered in the home agent table. A home agent assignment method in a wireless communication system, comprising assigning a home agent registered in a table. 3. The method of claim 1 or 2, wherein the home agent table includes a home agent name and a home agent IP address. The method of claim 1 or 2, wherein the home agent table further comprises at least one of an operating percentage of the home agent and whether the home agent is operated.