KR20050080294A - De-registration method of the registration information of mobile node in packet data network - Google Patents

Abstract

1. TECHNICAL FIELD OF THE INVENTION

The present invention relates to a method for releasing mobile node registration information in a packet data network.

2. The technical problem to be solved by the invention

The present invention provides a method for releasing mobile node registration information in a packet data network, which deletes previously stored registration information of a corresponding mobile node according to a registration information release request corresponding to a packet data service termination signal from a mobile node. There is a purpose.

3. Summary of the Solution of the Invention

A mobile node registration information release method in a packet data network, comprising: a mobile node registration step of registering registration information of a mobile node in response to receiving registration information from a mobile node (MN); A registration information release request receiving step of requesting release of registration information from the mobile node; A mobile node determination step of determining a mobile node corresponding to the received registration information release request; And a mobile node registration information deleting step of deleting previously registered registration information of the determined mobile node.

4. Important uses of the invention

The present invention is used in a packet data routing system.

Description

De-registration method of the registration information of mobile node in packet data network}

The present invention relates to a method for releasing mobile node registration information in a packet data network, and more particularly, registration information of a corresponding mobile node previously stored according to a registration information release request corresponding to a packet data service termination signal from a mobile node. And a method for releasing mobile node registration information from a packet data network.

In the present invention, a wireless communication terminal is a mobile communication terminal, a personal digital communication terminal (PCS), a personal digital terminal (PDA), a smart phone, a next generation mobile communication terminal (IMT-2000), wireless communication while being carried by an individual such as a wireless LAN terminal. This refers to a possible terminal (mobile node, MN; Mobile Node). Hereinafter, a description will be given using the term Mobile Node (MN).

In the present invention, the registration information of the mobile node is a care-of address (CoA) assigned from a home agent or an external agent, and is charged for the packet data service used by the mobile node. Information, setting information according to tunneling for packet data transmission and reception with the mobile node.

In addition, in the present invention, a life timer is a parameter included in a registration request message transmitted by a mobile node to a home agent or an external agent, and the home agent or the external agent is a time of the life timer included in the registration request message. Maintain the properties of the mobile node during (Life Timer Value).

Recently, with the development of wireless communication technology, users can not only make calls while moving through mobile nodes, but also enjoy the Internet.

As described above, in order to provide a packet data service (Internet service) to a user through a mobile node, the Internet Engineering Task Force (IETF) proposed Mobile IP in the RFC 2002 technical document.

According to the mobile IP technology, a mobile node can maintain a connection of an upper IP layer such as TCP, which is always dependent on an IP address and a port number, regardless of a subnet.

In order to support the mobile IP technology, a home agent and a foreign agent for registering a location to which the mobile node currently belongs are required.

1 is a configuration diagram of an embodiment of a packet data network including a general home agent and an external agent.

As shown in FIG. 1, a packet data network including a general home agent and an external agent includes a mobile node 10 on the user side and a current state of the mobile node 10 belonging to the same subnet as the mobile node 10. Home Agent for storing CoA indicating location and home address binding information and transmitting the packet transmitted to the mobile node 10 to the current location of the mobile node 10 through tunneling. (11) and an external agent for transmitting a packet received through the tunneling from the home agent 11 to the mobile node 10 belonging to the external subnet where the mobile node 10 is currently located. 12 and an authentication / verification / billing server (AAA; Authentication, Authorization, Acco) for performing an authentication and authorization verification process according to the packet service usage of the mobile node 10 and charging a usage fee. unting) 13. In addition, such a packet data network includes components such as a base station (BTS), a switching center (BSC), and the like, and a detailed description thereof will be omitted.

The home agent 11 and the external agent 12 are implemented as a router, etc. Recently, a packet data serving node (PDSN) has replaced the external agent function. Hereinafter, the external agent 12 and the packet data service node will be described as the same component, and the packet data service performing process of the mobile node 10 in the packet data network as described above will be described with reference to FIG. 2. Let's do it.

2 is a flowchart illustrating a method of releasing mobile node registration information in a packet data network according to a conventional scheme.

First, the home agent 11 continuously broadcasts an advertisement message to the mobile node 10 (Agent Advertisement) 200. At this time, the external agent 12 also continuously broadcasts the advertising message in the area. The home agent 11 and the external agent 12 each periodically broadcast an Agent Advertisement message to a corresponding region. In this case, the mobile node 10 may receive an agent advertisement message to recognize whether the mobile node 10 is in the home subnet or the external subnet, and whether the mobile node 10 moves between the home subnet and the external subnet or between different external subnets. can do.

Thereafter, the mobile node 10 starts the packet data service 201 and recognizes the current location (the same subnet as the home agent 11) through the received advertisement message of the home agent 11 (Agent Discovery). (202).

Thereafter, the mobile node 10 transmits a registration request message to the home agent 11 (Registration Request) (203). In this case, when the mobile node 10 is connected to the external agent 12, the mobile node 10 may transmit a registration request message to the home agent 11 through the external agent 12. The mobile node 10 also transmits a registration request message with the life timer value set to '2 hours' to the home agent 11. Accordingly, the home agent 11 maintains the registration information of the corresponding mobile node 10 by the life timer value included in the registration request message.

Then, the home agent 11 registers registration information (eg, CoA, etc.) of the mobile node 10 (Mobile Node Registration) 204. Here, the CoA may be an address of the foreign agent 12 when the foreign agent 12 exists in the external subnet in which the mobile node 10 is located, and packet data when the foreign agent 12 does not exist. It may also be an address obtained by using the DHCP service and the PPP function of the service node.

The home agent 11 then sends a registration response message to the mobile node 10 (205).

Accordingly, the mobile node 10 normally performs the packet data service (206). In this case, as the mobile node 10 receives a registration response message from the home agent 11 and performs a normal packet data service, registration of the mobile node 10 is performed for a registration lifetime (for example, two hours). If this time elapses, the mobile node 10 must renew its registration to continue to perform packet data service.

Then, when the mobile node 10 moves to another area and receives an advertisement message from the foreign agent 12 (207), it recognizes that the current location changes (208).

Thereafter, the mobile node 10 transmits a registration request message to the foreign agent 12 (Registration Request) (209).

Then, the foreign agent 12 registers registration information (eg, CoA, etc.) of the mobile node 10 (Mobile Node Registration) 210.

Thereafter, the foreign agent 12 transmits a registration response message to the mobile node 10 (211). Accordingly, the mobile node 10 can perform a packet data service through the foreign agent 12 at the changed position.

Thereafter, the mobile node 10 performs a packet data service and terminates the packet data service (212).

On the other hand, if there is no packet data transmission or registration information update request message transmission from the mobile node 10 within the registration information update time (eg, 2 hours, etc.) preset by the home agent 11 and the external agent 12. The registered information of the stored mobile node 10 is deleted (213a, 213b).

However, in the conventional technology as described above, even if the mobile node 10 terminates the packet data service (for example, turning off the wireless communication terminal or generating a packet data service termination signal) (212), the preset registration information is updated. Before time, the home agent 11 and / or the external agent 12 stored information of the mobile node 10 stored in the home agent 11 and / or shared information with other agents (eg, mobile node charging information, setting information according to tunneling, etc.). ) Is not deleted.

Therefore, the above-described conventional technique continuously stores the information of the mobile node 10 for a preset time by the home agent 11 and / or the external agent 12 regardless of the termination of the packet data service of the mobile node 10. Because of this, unnecessary resource waste occurs, and it is difficult to efficiently distribute appropriate radio resources to other mobile nodes.

The present invention has been proposed to solve the above problems, and the packet data for deleting the registration information of the mobile node previously stored according to the registration information release request corresponding to the packet data service termination signal from the mobile node. The purpose is to provide a method for releasing mobile node registration information in a network.

In order to achieve the above object, the present invention provides a method for releasing mobile node registration information in a packet data network, wherein the mobile node registers registration information of the mobile node in response to receiving registration information from a mobile node (MN). Node registration step; A registration information release request receiving step of requesting release of registration information from the mobile node; A mobile node determination step of determining a mobile node corresponding to the received registration information release request; And a mobile node registration information deleting step of deleting previously registered registration information of the determined mobile node.

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.

3 is a flowchart illustrating a method for releasing mobile node registration information in a packet data network according to the present invention.

In the packet data network according to the present invention, the registration information registration process of the mobile node 10 during the process of performing the mobile node packet data service is the same as the conventional method. Hereinafter, the mobile node 10 belongs to the subnet to which the foreign agent 12 belongs. The process of releasing registration information of the mobile node 10 according to the generation of the packet data service termination signal from the mobile node 10 while performing packet data service through tunneling formed between the external agent 12 and the home agent 11. This will be described in detail.

First, the mobile node 10 generates a packet data service termination signal (300) and transmits a de-rgistration request message to the external agent 12 (301). At this time, the mobile node 10 sets the life timer value of the registration request message to '0' and transmits it to the external agent 12.

Additionally, the mobile node 10 sends a link control protocol termination request message (LCP (Link Control Protocol) to the external agent 12 so that the packet data service is normally terminated (PPP link disconnection). Terminate Request Message) may be transmitted (302).

Then, the foreign agent 12 determines the mobile node 10 that sent the deregistration request message (303). At this time, the foreign agent 12 determines the mobile node 10 through mobile node registration information (eg, CoA) included in the received deregistration request message.

Then, the registered information of the determined mobile node 10 in which the external agent 12 is stored in advance and sharing information with the home agent 11 related to the mobile node 10 (eg, mobile node charging information, Setting information due to tunneling) is deleted (304).

The foreign agent 12 transmits the deregistration request message of the received mobile node 10 to the home agent 11 (305).

Then, the home agent 11 determines the mobile node 10 that sent the deregistration request message (306).

Thereafter, the home agent 11 stores previously registered registration information of the mobile node 10 and sharing information with the external agent 12 related to the mobile node 10 (eg, mobile node charging information, And setting information due to tunneling) (307).

Additionally, in one embodiment as described above, the mobile node 10 first accesses a home agent 11 belonging to the same subnet and performs registration information, and then moves to another region (subnet to which the external agent 12 belongs). As it moves, the packet data service may be performed through tunneling formed between the external agent 12 and the home agent 11 by accessing the external agent 12. 11, in the process of performing packet data service through only the home agent 11 without accessing another region and removing the mobile node registration information from the external agent 12, the mobile node 10 and the mobile node 10 are not required. Direct communication between the home agents 11 is performed to perform registration release of the mobile node 10.

4 is a state transition diagram of an embodiment of a packet data service performing process in a mobile node according to the present invention.

As shown in FIG. 4, a packet data service performing process in a mobile node according to the present invention includes a no session state 400 and an initial registration request state (INIT RRQ) 401. ), A re-registration request (Re-RRQ) state 402, a re-registration state (403), and a de-registration state (De-registration state) (404). do.

In the present invention, the mobile node 10 performs the deregistration request process and requests the home agent 11 or / and the external agent 12 to release its registration information.

That is, the mobile node 10 performs a deregistration request process when a packet data service end signal (eg, a wireless communication terminal power off or packet data service end signal generation) occurs. At this time, the mobile node 10 transmits to the home agent 11 or / and the external agent 12 a deregistration request message in which a life timer value is set to '0'. Here, the deregistration request message is a message in which only the life timer value included in the conventional registration request message is changed.

In addition, the mobile node 10 does not wait to receive a registration request release response message from the home agent 11 and / or the external agent 12 after sending the registration release request message to the corresponding agent.

In addition, when the mobile node 10 uses the PPI function through the packet data service node, the mobile node 10 performs a deregistration request process and then a link control protocol termination request message (LCP). It can also request to terminate PPI service by sending Terminate Request).

The present invention described above is not limited to the above-described embodiments and the accompanying drawings, and various substitutions, modifications, and changes are possible in the art without departing from the technical spirit of the present invention. It will be clear to those of ordinary knowledge.

As described above, according to the present invention, when the mobile node terminates the packet data service by deleting the previously stored information of the mobile node according to the registration information release request corresponding to the packet data service termination signal from the mobile node. It is possible to release all the properties of the mobile nodes that were shared between the home agent and / or the external agent, thereby reducing the waste of resources for storing unnecessary mobile node properties, and providing radio resources to other mobile nodes. There is an effect that can be efficiently distributed.

1 is a diagram illustrating an embodiment of a packet data network including a general home agent and an external agent.

2 is a flowchart illustrating a method for releasing mobile node registration information in a packet data network according to a conventional method.

3 is a flowchart illustrating a method for releasing mobile node registration information in a packet data network according to the present invention.

4 is a state transition diagram of an embodiment of a packet data service performing process in a mobile node according to the present invention;

* Explanation of symbols on the main parts of the drawing

10: mobile node 11: home agent

12: external agent 13: authentication / verification / billing server

Claims (4)

A method for releasing mobile node registration information in a packet data network, A mobile node registration step of registering registration information of the mobile node in response to receiving registration information from a mobile node (MN); A registration information release request receiving step of requesting release of registration information from the mobile node; A mobile node determination step of determining a mobile node corresponding to the received registration information release request; And A mobile node registration information deleting step of deleting previously registered registration information of the determined mobile node. Mobile node property release method in a packet data network comprising a. The method of claim 1, Receiving the registration information release request, And receiving a registration request message having a life timer value of '0' from the mobile node. The method of claim 1, The mobile node determination step, And determining the corresponding mobile node through the registration information included in the registration request message received from the mobile node. The method according to any one of claims 1 to 3, The mobile node, A method for releasing registration information of a mobile node in a packet data network, comprising requesting release of registration information from an agent at a current location according to a packet data service termination signal.