KR20020094974A - Method of transmitting packet data, and system for the same - Google Patents

Abstract

PURPOSE: A method for transmitting packet data and a system therefor are provided to efficiently manage a changed IP(Internet Protocol) address of an MS(Mobile Station) and use the changed IP address of the MS. CONSTITUTION: A PDSN(Packet Data Servicing Node) requests an access to an HAAA(Home Authentication, Authorization, and Accounting) about an NAI(Network Access Identifier)(S11). The HAAA transmits an acceptance message as to the request of an NAI user to the PDSN(S12). The PDSN discriminates whether it is accepted as to the NAI transmitted from the HAAA, admits an Internet access of an MS(Mobile Station), and assigns an IP to the MS in an IPCP(IP Control Protocol) stage for setting a PPP(Point-to-Point Protocol) link(S13). The PDSN adds the NAI and a home IP address to a status-client message for notifying the IP address assigned to the MS, and transmits the status-client message to the HAAA(S14). The HAAA transmits an RR(Resource Records) update message about a domain name of the NAI to an MDNS(Mobile Domain Name System) by an RFC 2136 type so that the MDNS updates the IP address of the NAI(S15). The MDNS transmits a response message as to the update of the IP address to an HAAA server(S16). The PDSN transmits a message for starting an accounting to the HAAA(S17). Data are transmitted after a link is set between the MS and the PDSN, the MS repeatedly performs a dormant state and an active state according to the transmission and reception of the data, and accounting information is exchanged between the PDSN and an AAA(S18,S19). If the PPP link is released, the PDSN transmits the status-client message to the HAAA for informing that the IP address assigned to the NAI is released(S21). The HAAA transmits an NAI RR update message to the MDNS for informing that the IP address assigned to the corresponding NAI is released as a null state(S22).

Description

Method of transmitting packet data and system for same {Method of transmitting packet data, and system for the same}

The present invention relates to a mobile communication system, and more particularly, to a packet data transmission method and a system therefor.

As is known, in a cellular / personal mobile / IMT-2000 mobile communication system, when a user of a mobile station (MS) wants to access the Internet and receives a service, a base transceiver station between the MS and a packet data serving node (PDSN) is used. A link capable of exchanging Point-to-Point Protocol (PPP) links or other Internet IP datagrams is established through a System (BTS) and a Base Station Controller (BSC).

Through the link, the MS is assigned an IP address assigned by the PDSN or the Home Agent (HA), and can use this address to communicate with an IP host / server on the Internet.

In addition, in order to authenticate the MS's connection to the Internet and to handle the billing, the NAI (Network Access Identifier) of the MS is transmitted to the AAA (Authentication, Authorization, Accounting) server at the time of establishing the link between the MS and the PDSN. Controls the authentication, authorization and charging of the terminal for each NAI.

While the MS has a PPP link to the PDSN, it is free to communicate with an IP host / server on the Internet. The IP host / server provides the IP push service to the MS without service request from the MS user. If there is an IP address identifying a fixed MS user, the IP push server can send an IP datagram whose destination address is the IP address of the MS.

However, if you are a simple IP user (assigned a dynamic address from a local PDSN) and a mobile IP user with a dynamic HA assignment scheme that dynamically assigns an IP address every time you connect to the Internet, the IP push server is the MS. Does not know the assigned IP address when establishing a link to the PDSN.

That is, according to the conventional method, since the simple IP user and the mobile IP user by dynamic HA assignment do not have a permanently assigned IP address, the IP push server can identify the IP of the MS user and send the IP datagram. There is no way.

Accordingly, an object of the present invention has been made in view of the above-mentioned problems of the prior art, and provides a packet data transmission method and a system therefor for efficiently managing and using a changed IP address of an MS. will be.

Another object of the present invention is to provide a method for transmitting packet data to a desired MS and a system for receiving the changed IP address of the MS.

According to an aspect of the present invention for achieving the above object, the step of allocating an IP address corresponding to a network access identifier (NAI) assigned to a mobile terminal user according to the network access of the mobile terminal; Providing an IP address and a network access identifier information table corresponding to the IP address; Querying an IP address corresponding to a network access identifier by a provider to transmit data to the terminal; And transmitting data to the corresponding terminal in response to the query result.

A point-to-point protocol link is established between the terminal and the network.

The network allocates an IP address in either the simple IP mode or the mobile IP mode to the terminal.

Preferably, the method may further include recovering an IP address corresponding to the network access identifier assigned to the terminal or the terminal user.

In the information table, an IP corresponding to each network access identifier is changed according to the IP allocation.

Alternatively, in the information table, when the point-to-point protocol timer expires, when the IP registration validity time expires, and when the terminal moves to another data service area, the IP corresponding to each network access identifier is changed.

The service provider connected to the network queries the IP address corresponding to the network access identifier of a specific terminal regardless of the request of the terminal, and transmits data to be provided to the corresponding terminal having the IP address.

According to another aspect of the present invention for achieving the above object, the terminal; A packet data serving node for routing packets provided to / from the terminal, establishing a link with the terminal, and generating a network connection identifier of the terminal to which the link is established, and IP information assigned to the network connection identifier; A domain system for storing the generated network access identifier and IP information; And an authentication server configured to perform authentication and charging of the established terminal and request an update from a packet data serving node to a domain name system according to a network access identifier and IP information.

Preferably, a point-to-point protocol link is established between the terminal and the packet data serving node.

The packet data serving node allocates a simple IP to the terminal according to the packet service request of the terminal.

The packet transmission system further includes a home agent for allocating a mobile IP according to an IP registration request of the terminal.

The domain system updates the IP corresponding to each network access identifier according to the IP allocation / count.

Alternatively, the domain system updates the IP corresponding to each network access identifier when the point-to-point protocol timer expires, when the IP registration validity time expires, and when the terminal moves to another data service area.

Preferably, the packet data transmission system further includes a packet service providing server for querying a domain system for an IP address corresponding to a specific network access identifier to provide a data service regardless of a request of a terminal.

1 is a diagram showing a network configuration for a wireless Internet service of a mobile communication system according to the present invention.

2 is a diagram illustrating Internet access setting and MDNS resource record updating process by a simple IP method according to the present invention.

3 is a diagram illustrating a mobile IP type internet access setting and an MDNS resource record updating process according to the present invention.

4 is a diagram illustrating an IP push service processing procedure for a simple IP user according to the present invention.

The configuration of the present invention identifies a mobile station (MS) and an MS user, uses a network access identifier (NAI) used for billing as a domain name, and provides a mobile domain name (MDNS) for providing a dynamic domain name service for the NAI. System).

This MDNS works in conjunction with a home AAA (Home Authentication, Authorization, Accounting) server to immediately update the IP address information whenever the IP (Internet Protocol) address assigned to the NAI is changed.Packet Data Serving Node (PDSN) The AAA will exchange messages from the PDSN to the HAAA to inform the NAI of the IP address as soon as the IP address assigned to the NAI is determined.

Hereinafter, a configuration and an operation according to an exemplary embodiment of the present invention will be described with reference to the accompanying drawings.

1 is a diagram illustrating a network configuration for a wireless Internet service of a mobile communication system according to the present invention.

As shown in FIG. 1, the cellular / personal portable / IMT-2000 mobile communication system according to the present invention includes a base transceiver system (BTS) for wireless transmission and reception, a control function for the BTS, and a wireless signal processing function. A BTS (BTS System Controller) in charge of the service, a Mobile Switching Center (MSC) that performs call exchange and radio resource allocation, operates in connection with the MSC, and wireless to connect a public switching telephone network (PSTN) / Internet. IWF (Interworking Function) which is a data device, a Home Location Register (HLR) that performs a function of storing information of the MS, routes packets provided to / from the terminal, establishes / releases a link with the terminal, A packet data serving node (PDSN) for generating the NAI of the terminal to which the link is established or released, IP information allocated / received to the NAI, a packet control function (PCF) to perform data relay from the PDSN to the MS, HAAA server which performs authentication, authorization, and charging of the terminal, requests update to the MDNS according to the network access identifier and IP address information from the PDSN, HA for allocating mobile IP according to the IP registration request of the terminal, and mobile data. A mobile domain name system (MDNS), which is a domain name server of the MS, is configured to manage a network access identifier (NAI) used as a terminal user or a network access identifier of the MS as a domain name of the MS and the user.

The MDNS updates the IP address information of the MS in real time, and updates domain name resource records (hereinafter, referred to as RR). Here, the domain name uses NAI. Therefore, the MDNS stores the IP corresponding to the NAI, and the MDNS receives information from the AAA whenever the IP address corresponding to each NAI is changed.

When the PPP link established between the MS and the PDSN is established, the Packet Control Function (PCF) collects the charging information for the data packet of the MS transmitted through the corresponding link, and delivers it to the PDSN. At this time, the charging information includes radio link recording information of the radio section.

The PDSN sends an accounting request message to the AAA to start charging, causing the AAA to process the MS's charge.

The NAI of an MS user is stored in the AAA of the wireless service provider or wireless Internet service provider (ISP) to which the MS user subscribes, which is called HAAA (Home AAA). You can also access the Internet by accessing the cellular / personal portable / IMT-2000 carrier network for connection, so AAA in another operator's network is called a visitor AAA (VAAA). Through this, Microsoft's NAI is certified, licensed and billed.

The change of the IP of the MDNS is made through a different process according to the simple IP or mobile IP in Figures 2 to 4 below.

2 is a diagram illustrating Internet access setting and MDNS resource record updating process by a simple IP method according to the present invention.

2, a challenge handshake authentication protocol (CHAP) / password authentication protocol (CHAP) is performed between the MS and the PDSN during a Link Control Protocol (LCP) initialization process (S10), and the PDSN accesses the HAAA for the NAI. Request (S11), the HAAA sends an acceptance message for the request of the NAI user to the PDSN (S12), the PDSN determines whether to accept the corresponding NAI sent by the HAAA to grant the MS access to the Internet, and establishes the PPP link configuration. In step IPCP (IP Control Protocol), an IP is allocated to the MS.

After the MS is assigned an IP, when the MS does not move to another PDSN's area and the PPP timer has not expired, or when the user of the MS continues to use the packet service, the PPP link between the MS and the PDSN is maintained. Since the assigned IP address remains unchanged, the PDSN transmits including the NAI and the home IP address in a message (Status-Client) informing HAAA of the IP address assigned to the MS (S14).

HAAA sends a resource record (RR) update message for NAI's domain name to its internal or external MDNS by means of RFC 2136, developed by IETF, so that the MDSN can update the NAI's IP address. S15)

MDNS transfers the response message to the IP address update to the HAAA server, and the processing for the IP address assigned to the NAI is completed (S16).

The PDSN sends a message to the HAAA to start charging (S16), and at the same time, data is transmitted after the link is established between the MS and the PDSN, and the MS repeats the dormant / active state depending on whether or not the data is transmitted and received, thereby charging Information is exchanged between PDSN and AAA (S18, S19).

In the case of a simple IP user, if there is no data exchange between the MS and PDSN for a long time, the PPP link for packet service is automatically terminated by the end of the PPP timer, and the allocated IP address is also recovered. Subsequent reconnections will be assigned a different IP address.

Therefore, when the PPP link is released (S20), the PDSN immediately sends a Status-Client message to the HAAA, indicating that the IP address assigned to the NAI has been released. (S21)

The HAAA sends a NAI RR update message to the MDNS to inform that the IP address assigned to the corresponding NAI has been released in a null state (S22).

By notifying that the MDNS has processed the response in response to the HAAA (S23), the NAI domain name resource record updating process at the time of release is completed.

Subsequently, the PDSN transfers the billing information to the HAAA for billing processing, and may be performed regardless of the order in which the PDSN sends a Status-Client message and an accounting request message for the NAI (S24).

3 is a diagram illustrating a mobile IP type internet access setting and an MDNS resource record updating process according to the present invention.

Referring to FIG. 3, in the case of a dynamic mobile IP user, a PPP link is established between the MS and the PDSN (S30), and the PDSN periodically broadcasts an agent advertisement message (S31).

The MS checks whether the mobile station moves between subnets through an agent advertisement message, and obtains a care of address (COA) from the PDSN in the case of an external network, and transmits a registration request message to the HA using the agent advertisement message (S32 to S35). )

The HA assigns an IP address to the dynamic mobile IP user through the registration response message (S36), and the PDSN receiving the message recognizes the IP address assigned to the MS and delivers the mobile IP registration response message to the MS. S37)

At the same time, the PDSN sends a Status-Client message to HAAA to notify the IP address assigned to the NAI (S38).

The HAAA transmits an RR update message for the domain name of the NAI to the MDNS implemented inside or outside thereof, so that the MDSN renews the IP address of the NAI (S39).

MDNS transfers the response message for the IP address update to the HAAA server, thereby completing the process for the IP address assigned to the NAI (S40).

Accordingly, the PDSN sends a message to the HAAA to start charging (S41), and at the same time, data is transmitted after the link is established between the MS and the PDSN, and the MS is in a dormant / active state depending on whether the data is transmitted or received. Repeatedly, the charging information accordingly is exchanged between PDSN and AAA. (S42, S43)

For mobile IP users, after the MS establishes a PPP link in the PDSN and the registration validity time expires, the PPP link is released unless it is newly re-registered.

Therefore, after the registration validity time expires, the PDSN transmits a Status-Client message to the HAAA to update the DNS resource record information of the NAI for the MS, indicating that the IP address assigned to the NAI has been released. (S44)

The HAAA sends a NAI RR update message to the MDNS to inform that the IP address assigned to the corresponding NAI has been released in a null state (S45).

By notifying that the MDNS has processed in response to the HAAA (S46), the NAI domain name resource record update process at the time of release is completed.

Subsequently, the PDSN transfers the billing information to the HAAA so that the billing process is performed (S47). The PDSN may perform the order of sending a status-client message and an accounting request message for the NAI.

4 is a diagram illustrating an IP push service processing procedure for a simple IP user according to the present invention.

4, it is assumed that a simple IP user registers an IP push service to an IP push server through NAI.

During a Link Control Protocol (LCP) initialization process, a challenge handshake authentication protocol (CHAP) / password authentication protocol (PAP) is performed between the MS and the PDSN (S50), and the PDSN requests access to HAAA for the NAI (S51), HAAA sends an acknowledgment message for NAI user's request to PDSN (S52), PDSN determines whether to accept correspondence with NAI sent by HAAA to grant MS's Internet access, and IPCP (IP Control Protocol) for establishing PPP link In step S), an IP is allocated to the MS.

The PDSN notifies the HAAA of the IP address assigned to the NAI by sending a Status-Client message to the HAAA.

The HAAA transmits an MN (Mobile Node) registration update message for the domain name of the NAI to the MDNS implemented inside or outside thereof, thereby updating the IP address of the NAI (S55).

MDNS transfers the response message for the IP address update to the HAAA server, thereby completing the processing for the IP address assigned to the NAI (S56).

Accordingly, the PDSN sends a message to start the charging to the HAAA (S57).

When an IP push service event for the corresponding NAI occurs in the IP push server and the IP push server requests the domain name service of the NAI to the MDNS (S58), the MDNS transmits an IP address for the corresponding NAI (S59).

According to the transmitted IP address, the push server transmits a data service for a push service to a desired MS (S60).

As described above, NAI is used as the domain name of the MS or MS user, and MDNS which is responsible for the domain name service for the domain name is established, and the IP push server performs the IP push service based on the user's NAI. Do it.

When an IP push service event occurs, the IP push server issues a domain name service query to MDNS to find out the IP address currently used by the MS of the NAI and send an IP datagram.

Therefore, it is possible to receive an IP push service regardless of a frequently changing IP address such as a simple IP user.

As described above, the present invention enables an IP push service that has been impossible for MS users connecting to the Internet using dynamic IP among MS users of a cellular / personal portable / IMT-2000 system.

In addition, various Internet services such as VoIP based on NAI are possible.

Those skilled in the art will appreciate that various changes and modifications can be made without departing from the spirit of the present invention.

Therefore, the technical scope of the present invention should not be limited to the contents described in the examples, but should be defined by the claims.

Claims (19)

Allocating an IP address corresponding to a network access identifier (NAI) assigned to a mobile terminal user according to a network access of the mobile terminal; Providing an IP address and a network access identifier information table corresponding to the IP address; Querying an IP address corresponding to a network access identifier by a provider to transmit data to the terminal; And transmitting data to a corresponding terminal in response to the query result. 2. The method of claim 1, wherein a point-to-point protocol link is established between the terminal and the network. The method of claim 1, wherein the network allocates an IP address in one of a simple IP mode and a mobile IP mode to the terminal. The method of claim 1, further comprising retrieving an IP address corresponding to a network access identifier assigned to the terminal or the terminal user. The packet data transmission method of claim 1, wherein the information table changes an IP corresponding to each network access identifier according to the IP allocation. 5. The method of claim 4, wherein the information table is changed in IP corresponding to each network access identifier when the point-to-point protocol timer expires. 5. The method of claim 4, wherein the information table changes IP corresponding to each network access identifier when the IP registration valid time expires. 5. The method of claim 4, wherein the information table changes IP corresponding to each network access identifier when the terminal moves to another data service area. The method of claim 1, wherein the service provider connected to the network queries an IP address corresponding to a network access identifier of a specific terminal regardless of a terminal's request. terminal; A packet data serving node for routing packets provided to / from the terminal, establishing a link with the terminal, and generating a network connection identifier of the terminal to which the link is established, and IP information assigned to the network connection identifier; A domain name system for storing the generated network access identifier and IP information; Packet data, characterized in that it comprises an authentication server for performing the authentication, authorization and billing of the terminal set to the link, and makes an update request from the packet data serving node to the domain name system according to the network access identifier and IP address information. Transmission system. 11. The system of claim 10, wherein a point-to-point protocol link is established between the terminal and the packet data serving node. The packet data transmission system of claim 10, wherein the packet data serving node allocates a simple IP to the terminal according to a packet service request of the terminal. The packet data transmission system of claim 10, further comprising a home agent for allocating a mobile IP according to an IP registration request of the terminal. The packet data transmission system according to claim 10, wherein the terminal allocates or retrieves either simple IP or mobile IP. The system of claim 10, wherein the domain system updates an IP corresponding to each network access identifier according to the IP allocation / count. The system of claim 10, wherein the domain system updates an IP corresponding to each network access identifier when the point-to-point protocol timer expires. The packet data transmission system of claim 10, wherein the domain system updates an IP corresponding to each network access identifier when the IP registration validity time expires. The packet data transmission system of claim 10, wherein the domain system updates an IP corresponding to each network access identifier when the terminal moves to another data service area. 10. The apparatus of claim 9, further comprising a packet service providing server for querying a domain system for an IP address corresponding to a specific network access identifier to provide a data service irrespective of a request of a terminal. Transmission system.