KR20060000676A - Mobile station subscriber management method for imt-2000 multicast service - Google Patents

Abstract

The present invention relates to the provision of a multicast service for an IMT-2000 mobile terminal. In particular, the present invention provides an efficient multicast service by reducing the load in a GGSN (Gateway GPRS Support Node) system, which is an asynchronous data transmission device, by supplementing an IGMP message processing procedure. It relates to a subscriber management method of a mobile terminal. Conventionally, the GGSN system periodically transmits an IGMP query message to a computer or PDA terminal connected to a mobile terminal and receives a response message, and processes the received IGMP-2000 multicast service. However, the present invention provides a mobile terminal and a GGSN system. By supplementing the IGMP message processing procedure between the two, IMG report message and IGMP withdrawal message manage the subscription and withdrawal of the multicast service, and by supplementing the IGMP message processing procedure, it reduces the delay time when providing the multicast packet and the GGSN system. You can improve performance by reducing the load.

IGMP message, GGSN, multicast application server.

Description

 Mobile station subscriber management method for IMT-2000 multicast service}

1 is a diagram illustrating a procedure for subscribing to a multicast to a mobile terminal using an IGMP message used in a conventional wired network.

2 is a diagram illustrating a procedure for leaving a multicast to a mobile terminal using a conventional IGMP message;

3 is a flowchart illustrating a procedure for subscribing to an IMT-2000 multicast service using an IGMP message of the present invention;

Figure 4 is a flow chart illustrating a withdrawal procedure of the IMT-2000 multicast service using the IGMP message of the present invention.

<Description of Major Symbols in Drawing>

20, 40: computer, 30, 50: mobile station,

60: Node B, 70: RNC,

80: SGSN, 90: GGSN,

100: Multicast Application Server.

The present invention relates to the provision of a multicast service for an IMT-2000 mobile terminal, and in particular, to supplement the Internet Group Management Protocol (IGMP) message processing procedure, the GGSN (Gateway GPRS) asynchronous data transmission device. Support Node) The present invention relates to a subscriber management method of a subscriber mobile terminal for an IMT-2000 multicast service capable of reducing a load in a system and providing an efficient multicast service.

In general, the Internet Group Management Protocol (IGMP) is a protocol for multicasting ID datagrams to subscriber groups identified by a single Internet Protocol (IP) multicast address. Like IMP (Internet Control Message Protocol), it is an IP module function. . You also need a multicast router to transfer IP multicast datagrams between networks.

In order to execute a multicast application such as video conferencing in a general wired network, a router has to perform two functions in order to transmit a multicast packet together with a user's application for subscription. One is the management of hosts that have joined a multicast group and the creation of a multicast tree for forwarding multicast packets. In multicast transmission, a packet is transmitted using a multicast address, so that a packet can be transmitted to subscribers joined to a multicast group in one packet transmission without transmitting multiple packets. Thus, the load on the network is reduced and efficient transmission is achieved.

In order to provide multicast service of general wired network, IGMP protocol is used when managing mobile terminals of multicast subscriber groups in neighboring routers. Routers that manage multicast groups periodically send IGMP query messages to see which multicast groups neighbors have joined. When a host joining a multicast group receives an IGMP query message, it sets a timer for random time so that when the timer expires, if it does not receive an IGMP Report message for the same multicast group from another host, the host will join the IGMP query. Send a message. This is not to know the list of subscribers that are subscribed to the multicast group for every network to which the router is connected, but to manage only which network has members that are subscribed to a particular multicast group. In order to leave a multicast group, the host that sent the IGMP report message in the previous cycle for the router's periodic IGMP query message sends an IGMP leave message to the representative, and the member who joins the multicast group in the network Announce None.

On the other hand, in order to support the multicast service of the IMT-2000 mobile terminal, the GGSN that performs the function of the nearest router for the actual call processing must perform the IGMP proxy function. From the point of view of a general router, the management of multicast group subscribers of all adjacent networks is the same as that of multicast group subscribers for all interfaces managed by it.

In order to manage the subscriber mobile terminal for the conventional IMT-2000 multicast service, the GGSN periodically sends an IGMP query message to all mobile terminals connected to the PDP context session, and withdraws the IGMP report message or IGMP from all the terminals. (Leave) received the message and managed the subscriber list.

In addition, unlike a wired network, in a multicast transmission to a session of a mobile terminal, a multicast packet must be copied and transmitted to all sessions joined to the multicast group. That is, when 100,000 mobile terminals are connected and all are using the multicast service, the GGSN transmits 100,000 IGMP query messages every cycle and receives 100,000 IGMP report messages to start the multicast service.

In addition, the withdrawal is performed only when the mobile terminal transmits an IGMP leave (leave) response signal for the IGMP query message sent by the GGSN system at regular intervals.

In addition, when the GGSN transmits and receives IGMP messages, regardless of the subscription, since IGMP messages are transmitted and received from all mobile terminals connected to each node B, unnecessary lobes are generated and the multicast service is delayed due to many procedures.

1 illustrates a procedure of subscribing to multicast with a mobile terminal using an IGMP message used in a conventional wired network.

The configuration includes a computer 20, 40, a mobile station 30, 50, a Node B 60, a Radio Network Controller (RNC) 70, a Serving GPRS Support Node (SGSN) ( 80), GGSN (90), and multicast application server (Multicast Application Server) (100).

Node B (60) is located between the mobile terminal (30, 50) and the RNC 70 to control the call to the subscriber and perform a maintenance function. It induces the subscriber to recognize the Node B 60 for the first time, delivers the necessary data, allocates traffic channels for the call request, and opens the path.

The RNC 70 incorporates an ATM switch to provide an optimal path for processing voice and packet data, and enables ATM matching with peripheral devices. The SGSN 80 is a core node constituting a general packet radio service (GPRS) network for efficiently transmitting high speed and low speed packet data and signals in an IMT-2000 system. The GGSN 90 serves as a gateway for packet network matching and performs GPRS packet data service through signaling with the SGSN 80.

Meanwhile, referring to FIG. 1, a procedure of subscribing to multicast using a mobile terminal using an IGMP message will be described.

First, the subscriber to the computer 2 (40) connected to the mobile terminal 50 using the access program for the subscriber BB 60, RNC 70, SGSN (80), GGSN (functioning as a router) Through 90), the multicast application server 100 providing the multicast packet is connected to the subscription request (step S200). Subscription to the multicast service means connection of a PDP session.

Receiving the subscription request, the GGSN 90 system generates a tree for the subscriber for the management of the subscribers to the multicast group and the provision of the multicast packet service.

In order to manage the subscriber list of the group using the multicast service, the GGSN 90 periodically transmits an IGMP query message to the computer 2 40 in all connected PDP context sessions. In FIG. 1, only Computer 2 40 is connected to the PDP session, and the IGMP Query message is transmitted only to Computer 2 40 (step S210). This is to check only in which network there is a mobile terminal which has joined the multicast group.

The computer 2 (40) receiving the IGMP query message must respond to the IGMP Report message to the GGSN 90 to perform the multicast joining procedure and receive the multicast packet (step S220).

At this time, the subscriber 1 accesses the multicast application server 100 by using a program provided to the other computer 1 (20) to use the multicast service (step S230).

In the GGSN (90) system, the IGMP query message is transmitted to all terminals connected to the PDP session. In the GGSN (90), the IGMP query is transmitted to a plurality of computers 1,2 (20, 40) to which the session is connected via the node B (40). The message is transmitted (steps S240 and S250).

In the case of the computer 2 (40) receiving the IGMP query message, it is a wasteful procedure to be joined in step S200, and after the IGMP report message is transmitted to the GGSN 90 as a response signal from the computer 1 (20), the GGSN The multicast service is used by the computer 1 (20) through the router (90) (steps S260, S270).

The maximum number of PDP contexts that the conventional GGSN 90 system can accommodate is hundreds of thousands, and the IGMP Query message transmission cycle in the GGSN 90 is several minutes, and in the GGSN 90, every few minutes, Send IGMP query messages to hundreds of thousands of connected sessions. This means that an average of thousands of IGMP messages must be continuously transmitted per second, and there is a problem in that the performance of the system is degraded due to the large load just by transmitting the IGMP query message in the GGSN 90 system.

In addition, a mobile terminal subscribed to a multicast service must wait for a maximum number of minutes to receive an actual multicast packet. This is because, after the GGSN periodically sends an IGMP Query message to the GGSN, the GGSN can forward the multicast application service packet subscribed to the session to the mobile station. . Therefore, the user's dissatisfaction is caused by the delay time in providing the multicast service.

On the other hand, Figure 2 shows a procedure for leaving the multicast to the mobile terminal using a conventional IGMP message.

Referring to the operation of the conventional multicast subscriber withdrawal using the IGMP message.

The multicast subscriber accesses the multicast application server 100 through the computer 2 40 connected to the mobile terminal 50 and requests the withdrawal of the multicast application service (step S300).

When requesting to withdraw, GGSN 90 sends an IGMP query message to computer 2 (40) of the subscriber who requested the withdrawal. At this time, an IGMP query message is also sent to a plurality of other computers 1 (20) to which the session is connected. The load on the system is increased (step S310).

The computer 2 (40) receiving the IGMP query message transmits an IGMP Leave message to the GGSN 90 to withdraw the multicast application service, and performs the withdrawal procedure of the subscriber in the GGSN 90 (step). S320, S330).

At this time, the computer 1 (20), which is another user, also sends an IGMP report message to the GGSN 90, but this is unnecessary and increases only the load of the GGSN 90 (step S320).

In addition, the subscriber of the multicast application service accesses the multicast server 100 by using the computer 1 (20) connected to the mobile terminal 30 and requests the withdrawal of the multicast application service (step S340).

Upon requesting withdrawal, the GGSN 90 transmits an IGMP query message to the computer 1 20 of the subscriber who requested the withdrawal. At this time, the IGMP query message is also transmitted to a plurality of other computers connected to the session (step S350). In the figure, computer 2 (40) withdraws and the session is not connected and no IGMP query message is sent.

The subscriber's computer 1 (20) sends an IGMP leave message to the GGSN 90 to withdraw.

 In the provision of the conventional multicast application service, the GGSN 90 transmits an IGMP query message to all mobile terminals connected with a session, receives an IGMP report message or an IGMP withdrawal message, which is a response signal, and also joins and leaves a procedure. IGMP query messages are also periodically sent to computers connected to other mobile terminals that are not relevant to the city, increasing the load on the system.

In addition, in order to receive the actual multicast packet, there is a problem of waiting for a maximum time of several minutes.

Conventionally, the GGSN system periodically transmits an IGMP query message to a computer and a PDA terminal connected to a mobile terminal, and receives and processes a response message. However, the present invention solves the above-mentioned problem. When provided, it supplements the IGMP message processing procedure between the mobile terminal and the GGSN system to manage the subscription and withdrawal of the multicast service with the IGMP Report message and the IGMP Leave message, and multicast by supplementing the IGMP message processing procedure. It is to provide a subscriber management method of a mobile terminal for IMT-2000 multicast service that can reduce the delay in packet delivery and improve the performance by reducing the load of the GGSN system, which is an asynchronous data transmission device. For that purpose.

The present invention provides an IMT-2000 system for providing a multicast service, the method comprising: accessing a multicast application server to a computer terminal connected to a mobile terminal to subscribe to a multicast service, and requesting a use of the multicast application server. Subscribing to the multicast service to the computer terminal according to a procedure; transmitting a subscription information message to a GGSN at a multicast application server; and when the GGSN receiving the subscription information message is the first subscription, confirms and registers a subscriber. IMT-2000 multicast including the step of establishing a path by performing a multicast routing protocol for providing a cast packet, and using a multicast service by sending a response message to the GGSN system when the registration procedure is completed. Mobile terminal for service How to manage the particles.

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

The present invention can supplement the Internet Group Management Protocol (IGMP) message processing procedure to reduce the load in the GGSN (Gateway GPRS Support Node) system, which is an asynchronous data transmission device and to provide an efficient multicast service, subscription of the multicast service It is a multicast group management method of IMT-2000 multicast service that efficiently handles withdrawal.

3 is to process the IMT-2000 multicast service subscription procedure using the IGMP message of the present invention.

The present invention eliminates the load on the IMT-2000 system by processing the subscription and withdrawal of IMT-2000 multicast service provision without using an IGMP query message in the IGMP message processing procedure used in the conventional wired network. In addition, the delay time can be greatly reduced when the multicast service is provided, and the subscription and withdrawal of the multicast service can be efficiently performed.

 Subscriber requests multicast application service subscription request to multicast application server 100 using a terminal such as PDA, computer 1 (20) connected to or equipped with mobile terminal 30 of the present invention to subscribe to multicast service After that, unlike the prior art, the computer 1 20 sends the IGMP report message back to the GGSN 90 without receiving a separate IGMP query message from the GGSN 90 (steps S400 and S410).

At this time, the IGMP report message transmitted from the computer 1 (20) is encapsulated in a GTPU packet (encapsulated) and delivered to the GGSN 90 that performs the IGMP proxy (Proxy) function.

The multicast application server 100 transmits the user's subscription information to the GGSN 90 an IGMP report message of the IP level. In the case of the first subscription, the GGSN 90 checks the registration of the computer 1 20 and registers it, and then sets a path by performing a multicast routing protocol for providing a multicast packet.

 In addition, by using the computer 2 (40) connected to or provided with the mobile terminal 50, the multicast application service subscription request is sent to the multicast application server 100 to subscribe according to the procedure, and then the computer 2 (40) again. The IGMP report message is transmitted back to the GGSN 90 (steps S420 and S430). At this time, the IGMP report message transmitted from the computer 2 (40) is encapsulated in a GTPU packet (encapsulated) and delivered to the GGSN (90) that performs the IGMP proxy (Proxy) function.

The multicast application server 100 sends an IP level IGMP report message to the GGSN 90. In the case of the first subscription, the GGSN 90 checks the registration of the computer 2 40 and registers it, and then sets a path by performing a multicast routing protocol for providing a multicast packet. When the above-described subscription procedure is completed, the multicast application service can be used.

On the other hand, Figure 4 is a flow chart illustrating a withdrawal procedure of the IMT-2000 multicast service using the IGMP message of the present invention.

A subscriber sends a multicast application service withdrawal request to the multicast server 100 by using a terminal such as a computer 2 (40) or a PDA connected to or equipped with the mobile terminal 50 of the present invention to withdraw from the multicast service. After applying, the computer 2 40 sends the IGMP leave message back to the GGSN 90 without receiving a separate IGMP message from the GGSN 90 (steps S500 and S510).

The multicast application server 100 transmits the user's withdrawal request information to the GGSN 90 an IGMP report message of the IP level. The GGSN 90 deletes the information on the registered computer 2 40, and also deletes and removes the setting path for providing the multicast packet.

In addition, the subscriber transmits the multicast application service withdrawal request to the multicast server 100 using the computer 1 (20) connected or provided with the mobile terminal 30, and withdraws according to the procedure. Sends an IGMP leave message back to the GGSN 90 (steps S520 and S530).

The multicast application server 100 transmits the user's withdrawal request information to the GGSN 90 an IGMP report message of the IP level. The GGSN 90 deletes the information about the registered computer 1 20, and also deletes and removes the setting path for providing the multicast packet.

As described above, the present invention does not transmit an IGMP message to all connected sessions differently from the prior art, and manages the subscription and withdrawal of a multicast service through an IGMP report message and an IGMP leave message, and provides a multicast packet. It can reduce latency and reduce the load and improve performance of the GGSN system, an asynchronous data transmission device.

 As described above, the present invention provides a fast process for multicast subscription and withdrawal without sending IGMP query messages periodically for PDP sessions connected in GGSN, and provides a multicast application service such as video conferencing. This reduces latency and improves the performance of the IMT-2000 GGSN system.

The present invention is to complement the IGMP message processing procedure to increase the processing speed by removing the transmission and reception of unnecessary messages, reducing the load of the GGSN system has the effect of increasing the efficiency of the GGSN system.

Claims (4)

In the IMT-2000 system providing a multicast service, Accessing a multicast application server to a computer terminal connected to the mobile terminal to subscribe to a multicast service and requesting usage; Subscribing to the multicast service to the computer terminal according to a procedure provided by the multicast application server; Transmitting a subscription information message to a GGSN at the multicast application server; Receiving the subscription information message, establishing a path by performing a multicast routing protocol for confirming and registering a subscriber and providing a multicast packet when the first subscription is a first subscription; And using the multicast service by transmitting a response message to the GGSN system in the computer terminal. The method of claim 1, The response message is a subscriber management method of a mobile terminal for the IMT-2000 multicast service, characterized in that the IGMP report message. In the IMT-2000 system providing a multicast service, Connecting the subscriber to the multicast application server to the withdrawal of the multicast service from the computer terminal connected to the mobile terminal; Withdrawing from the multicast service according to a procedure provided by the multicast application server; Deleting information of the subscriber registered in the multicast application server and deleting a transmission path set for transmission of a multicast packet; And unsubscribing from the multicast service by transmitting a response message to the GGSN at the computer terminal. The method of claim 3, wherein The response message is a subscriber management method of a mobile terminal for IMT-2000 multicast service, characterized in that the IGMP leave (leave) message.

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