KR20020094975A - Method of transmitting packet data over IP, and system for the same - Google Patents

Abstract

The present invention relates to a mobile communication system, and more particularly, to an IP-based packet data transmission method and a system therefor. The present invention provides a system for packet data transmission, which routes packets provided to / from a terminal, establishes / releases a link with the terminal, and assigns the network connection identifier of the terminal to which the link is established or released, and the network connection identifier. A packet data serving node for generating / recovered IP address information; A domain name system for storing the generated network access identifier and IP address information and calling a terminal having a corresponding network access identifier when the information requested by the service provider does not exist; Perform authentication, authority and charging of the established terminal, request update from a packet data serving node to the domain name system according to a network access identifier and IP address information, and input a terminal identifier (MSID) corresponding to the network access identifier An authentication server for verifying and forwarding a call message of the domain name system to a packet data serving node that is relatively closest to the terminal identifier; A terminal for establishing a link with the packet data serving node in response to the call message and receiving data based on an IP assigned through the link; It is configured to include a server for providing a data service to the terminal.

Description

IP-based packet data transmission method and system for same {Method of transmitting packet data over IP, and system for the same}

The present invention relates to a mobile communication system, and more particularly, to an IP-based 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 delivered to the AAA (Authentication, Authorization, Accounting) server when the MS establishes the link with 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-described problems of the prior art, and provides an IP-based packet data transmission method and system for efficiently managing and using the changed IP address of the MS. It is to provide.

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

According to an aspect of the present invention for achieving the above object, a step of searching for an IP address of a terminal having a specific NAI in a predetermined information table according to a query of a service provider; If there is no IP address having a specific NAI, calling the terminal having the specific NAI; Updating the information table according to a network identifier (NAI) of the called terminal and an IP address assigned corresponding to the network identifier; And transmitting data to the terminal by the service provider in correspondence with the updated IP address.

Preferably, if the search results, there is no IP address with a specific NAI, the step of the service provider to the IP address of the terminal having a specific NAI after a predetermined time; And providing the service provider with an updated IP address corresponding to the NAI according to the material.

On the other hand, if there is no IP address with a specific NAI as a result of the search, checking the terminal identifier corresponding to the NAI; Identifying a packet service area relatively close to the terminal identifier; The method may further include calling a terminal having a specific NAI in the identified packet service area.

Preferably, in response to the call, the terminal establishes a link with a network including the packet service area; The method may further include receiving an IP address through the established link.

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

According to another aspect of the present invention for achieving the other object as described above, it is possible to route packets provided to / from a terminal, to establish / release a link with this terminal, A packet data serving node for generating IP address information assigned / received to this network connection identifier; A domain name system for storing the generated network access identifier and IP address information and calling a terminal having a corresponding network access identifier when the information requested by the service provider does not exist; Perform authentication, authorization, and charging of the established terminal, and request an update from the packet data serving node to the domain name system according to the network access identifier and IP address information, and the terminal identifier (MSID) corresponding to the network access identifier An authentication server for verifying and forwarding a call message of the domain name system to a packet data serving node that is relatively closest to the terminal identifier; A terminal for establishing a link with the packet data serving node in response to the call message and receiving data based on an IP assigned through the link; It is configured to include a server for providing a data service to the terminal.

The authentication server may further include a home location register that queries the packet data serving node identifier relatively closest to the terminal identifier and provides the query result.

Preferably, a point-to-point protocol link is established between the terminal and the packet data serving node, and the terminal is assigned an IP over this link.

After establishing the link, the packet data serving node provides a network access identifier and allocated IP address information of the terminal to the domain name system.

On the other hand, if the queried information does not exist, the server queries the domain name system the IP address of the terminal having a specific NAI after a predetermined time.

In this case, the server may provide data by calling a terminal having a specific NAI regardless of a service request of the terminal user.

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

2 is a diagram illustrating a process of allowing a push service provider to provide a service to a corresponding MS when the MS does not establish a link to a PDSN according to the present invention.

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. BTS (BTS System Controller) in charge of the service, MSC (Mobile Switching Center) performing call exchange and radio resource allocation, wireless data for connecting to the MSC and connected to a public switching telephone network (PSTN) / Internet NWs (or network access identifiers) of MS users who are interworking functions (IWFs), and packets provided to and from mobile stations (MSs), establish / release links with these MSs, and establish or release links. And a PDSN for generating IP address information allocated / received to this NAI, storing the generated NAI and IP address information, and an MS having the corresponding NAI if the information requested by the IP push service provider does not exist. It performs authentication, authority and billing of the calling Mobile Domain Name System (MDNS), the linked MS, requests an update from the PDSN to the MDNS according to the network access identifier and IP address information, and the MSID corresponding to this NAI ( Mobile Station ID), a home AAA server that delivers the MDNS call message to the PDSN closest to the MSID, establishes a link with the PDSN in response to the call message, and assigns an IP assigned through this link. The MS receives data based on the MS, and the AAA server queries the PDSN ID that is relatively closest to the MSID, and a Home Location Register (HLR) provides the query result.

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.

For example, if an IP push service event occurs by a provider who wants to service packet data to a terminal with a specific NAI regardless of the service request of the terminal user, the IP push server issues a domain name service request to the MDNS. Find out the IP address currently used by the NAI's mobile station. Mobile stations used for frequently changing IP addresses, such as simple IP users, can also receive IP push services with NAI only when they are connected to the PDSN.

On the other hand, when the MS does not establish a link to the PDSN, the present invention proposes the following procedure so that the push service provider provides the service to the MS.

When the mobile station according to the present invention does not establish a PPP link in a PDSN or an AGW (Access Gateway), the paging of the mobile station based on the NAI will be described with reference to FIG.

First, it is assumed that an MS user uses an NAI allocated from a mobile communication provider. In addition, it is assumed that the mobile station user has registered a service to the IP push server, mail server, and Voice over IP (VoIP) session initiation protocol service based on this NAI.

For reference, the IP push server is a system for providing data that a service provider wants to send to a specific MS without a service request of an MS user.

For example, an IP push service provider requests an IP address to the MDNS when an IP service that reaches a specific NAI occurs (S10). According to this request, the MDNS searches a database.

At this time, MDNS delivers the IP address information assigned to the NAI to the host of the push service provider. However, if no specific IP address is assigned to a specific NAI in the MDNS, and the IP address cannot be reached, the MDNS sends a (request, response time) as a message to inquire again after a certain time (S11).

In addition, MDNS transmits a paging message for packet service to the NAI terminal to HAAA to inform that there is an Internet packet reception to the NAI terminal through an IP push service (S12).

HAAA checks the MSID (Mobile Station ID) corresponding to the NAI, and the packet service area (PDSN ID) closest to the base station subsystem (Base Station Subsystem: BSC / PCF) where the MSID (NAI) terminal is currently located by the HLR of the MSID. (S13)

The HLR examines the database of internal MSIDs and responds with the nearest PDSN ID currently registered as a query response (MSID, NAI, packet area PDSN ID) message (S14).

The HAAA sends a packet paging (MSID, NAI) message to the PDSN received from the HLR (S15), and the PDSN sends a packet paging (MSID, NAI) message to one BSC / PCF of one of the BSCs / PCFs to which it is connected. (S16)

The BSC / PCF asks the MSC for packet paging of the MS. Accordingly, the MSC requests MS paging with multiple BSCs, allowing the MS to set packet service options in response to paging (S17).

In response to the MS, the BSC / PCF connected to the MS establishes an RP connection as a response to the packet paging (MSID, NAI) to the PDSN requesting the packet paging (MSID, NAI). Send a message and establish the RP link by A10 / A11 (S18).

The PPP link establishment between the MS and PDSN / AGW is made according to the MS's IP usage mode (simple IP, mobile IP). Here, a process for a simple IP user to be assigned an IP in response to the packet paging as described above.

During the Link Control Protocol (LCP) initialization, a challenge handshake authentication protocol (CHAP) / password authentication protocol (PAP) is established between the MS and the PDSN (S19), the PDSN requests access to the HAAA for the NAI (S20), and the HAAA Sending an acknowledgment message for the request of the NAI user to the PDSN (S21), the PDSN determines whether to accept the corresponding NAI sent by HAAA to allow the MS to access the Internet, and IPCP (IP Control Protocol) for establishing a PPP link. In step S, an IP is allocated to the MS (S22).

At this time, when the PDSN sends an access request message to the HAAA, the request for the NAI is added with information indicating that the request is due to packet paging.

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

Accordingly, HAAA transmits an MN (Mobile Node) registration update message for NAI's domain name to an MDNS implemented internally or externally, thereby updating the IP address of the NAI. (S24) From the NAI RR update message, the MDNS is updated. It will be understood that a response to packet paging (NAI) S12 is received.

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 (S25).

Accordingly, the PDSN sends a message to start the charging to the HAAA (S26).

On the other hand, the IP push server waits for the time indicated by MDNS in step S11, and then sends a query (NAI, IP question) again (S27) to receive the MDNS response to this query to secure the IP address assigned to the NAI. (S28), the datagram is transmitted to the mobile station of the NAI.

In summary, it connects signaling channels to NAI's home AAA and HLR, and HAAA holds NAI and Mobile Station ID (MSID) of mobile station with NAI, and initiates sessions for IP push server, mail server, VoIP When the name service request of NAI terminal is received by MDNS from Internet host / server that provides Internet packet service to mobile station user based on NAI such as Session Initiation Protocol server, MDNS does not have IP address assigned to NAI. If it is unreachable, MDNS asks the HAAA to request packet paging, and the HAAA receives it and queries the HLR for the area in which the mobile station is currently located to determine the closest PDSN or access gate weight to which the current mobile station can respond. Information is obtained from the HLR, and HAAA issues a packet paging (MS, NAI) message to the obtained PDSN or access gateway. And so.

In an environment in which an Internet communication service is provided according to the above method, a mobile station user may receive an IP packet whenever a specific event occurs from a host providing an IP push service in an IP host / server of the Internet while accessing a PDSN or an access gateway. A push service for transmitting a message may be received by the MDNS.

As described above, according to the present invention, the operator of the cellular / personal portable / IMT-2000 system does not use a mobile IP method of statically assigning an IP address to the mobile station, and provides various Internet services based on the NAI to the mobile station user. The mobile station may connect the mobile station by paging by the user only when a packet service connection is required or by generating a packet that reaches the NAI of the mobile station as in the present invention. By performing and connecting, it is economical because the mobile station does not always have to manage the PPP link to the PDSN in order to provide various mobile station incoming packet data services to the mobile station, and it is possible to provide IP push service to the mobile station user with NAI alone. do

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 (11)

Searching for an IP address of a terminal having a specific NAI in a preset information table according to a query of a service provider; If there is no IP address having a specific NAI, calling the terminal having the specific NAI; Updating the information table according to a network identifier (NAI) of the called terminal and an IP address assigned corresponding to the network identifier; And transmitting data to a terminal by a service provider corresponding to the updated IP address. The method of claim 1, further comprising the step of, by the service provider, resolving the IP address of the terminal having a specific NAI after a predetermined time when there is no IP address having a specific NAI. The method as claimed in claim 1, wherein if there is no IP address with a specific NAI, the terminal checks the terminal identifier (MSID) and the packet service area where the terminal is located by using a network access identifier (NAI). IP-based packet data transmission method characterized in that it further comprises. 4. The IP-based packet data transmission method of claim 3, further comprising, in response to the call, the terminal establishing a link with a network including the packet service area and assigning an IP address. 5. The method of claim 4, wherein a point-to-point protocol link is established between the terminal and the network. A packet data serving node for routing packets provided to / from a terminal, establishing a link with the terminal, and generating a network identifier of the terminal and IP address information assigned to the network identifier; A domain name system for storing the generated network identifier and IP address information and calling a terminal having the network identifier; Perform authentication and charging of the established terminal, transfer network identifier and IP address information from the packet data serving node to a domain system, identify a terminal identifier (MSID) corresponding to the network connection identifier, and identify the terminal identifier And an authentication server for transmitting the call message of the domain name system to the packet data serving node where the terminal is located. A terminal establishing a link with the packet data serving node in response to the call message and receiving data based on an IP address allocated through the link; IP-based packet data transmission system, characterized in that it comprises a server for providing a data service to the terminal. 7. The IP-based packet data transmission of claim 6, wherein the authentication server further comprises a home location register for querying a terminal identifier and a packet data serving node identifier at which the terminal is located, and providing the query result. system. 7. The IP-based packet data transmission system of claim 6, wherein the terminal is assigned an IP address between the terminal and the packet data serving node. 7. The IP-based packet data transmission system of claim 6, wherein the packet data serving node provides a domain name system and an assigned IP address information to a domain name system by using a link. The IP-based packet data transmission system of claim 6, wherein, when the queried information does not exist, the server queries the domain name system for an IP address of a terminal having a specific NAI after a predetermined time. . 7. The IP-based packet data transmission system of claim 6, wherein the server provides data to a terminal having a specific NAI regardless of the service request of the terminal user.