KR20060034473A - Method for managing multicast broadcast service zone in a wireless broadband internet - Google Patents

Abstract

A new multicast / broadcast service area management method based on a multicast / broadcast service area concept for efficient multicast service support and group management in a wireless broadband Internet network is disclosed. The method comprises the steps of: A) a terminal subscriber station sending a request message to a base station (BS) for authentication and request for a predetermined identifier of a multicast service which it wishes to receive; B) the base station (BS) transmits an authentication request message to the terminal subscriber station to receive a predetermined identifier to the server performing authentication key assignment / management / authentication; C) the server sending an authentication response message for the terminal subscriber station (MSS) to the base station (BS); D) Upon successful authentication of the MSS, the base station (BS) sends a MBS Zone extend message for the predetermined identifier to the MBS server that manages the predetermined identifier and the base station for the multicast service. Requiring step; E) registering, by the MBS server, a base station (BS) as a receiver to be provided with a predetermined identifier multicast service and managing it as a table; F) the MBS server sending an ACK message to the base station (BS); G) the base station (BS) receiving the ACK message registers the predetermined identifier and the terminal subscriber station (MSS) in a table containing information on the multicast service received by the base station (BS); And H) the MSS is received by the BS over a contracted SA for the multicast service data broadcasting within its BS zone.

Multicast Broadcast Service, Mobile Internet, MBS zone, Multicast

Description

How to manage multicast / broadcast service area in wireless broadband internet network {METHOD FOR MANAGING MULTICAST BROADCAST SERVICE ZONE IN A WIRELESS BROADBAND INTERNET}

The following drawings, which are attached in this specification, illustrate the preferred embodiments of the present invention, and together with the detailed description of the present invention which serves to further understand the technical spirit of the present invention, the present invention includes matters described in such drawings. It should not be construed as limited to.

1 is a diagram illustrating a procedure of a BS joining an MBS zone during an MBS zone extension according to an embodiment of the present invention;

2 is a diagram illustrating a message flow of FIG. 1 according to an embodiment of the present invention.

3 is a flowchart illustrating an operation of FIGS. 1 and 2 according to an embodiment of the present invention;

4 is a diagram illustrating a case in which an MSS is connected to an already subscribed BS area during an MBS zone extension according to an embodiment of the present invention.

5 is a diagram illustrating a message flow diagram of FIG. 2 according to an embodiment of the present invention;

FIG. 6 is a diagram illustrating a case in which an MSS moves to an area subscribed to an MBS zone or an unsubscribed BS area during an MBS zone extension according to an embodiment of the present invention.                 

7 is a diagram illustrating a message flow diagram of FIG. 6 according to an embodiment of the present invention.

FIG. 8 is a diagram illustrating a case where a BS to which a terminal MSS is joined leaves the MBS zone during MBS zone reduction according to an embodiment of the present invention.

9 is a diagram illustrating a message flow of FIG. 8 according to an embodiment of the present invention.

10 is a flowchart illustrating the operation of FIGS. 8 and 9 according to an embodiment of the present invention.

The present invention relates to a multicast service technology, and more particularly, to a new multicast / broadcast service area management method based on a multicast / broadcast service area concept for efficient multicast service support and group management in a wireless broadband Internet network. .

In general, a multicast service is a communication method that enables one-to-many data communication between a plurality of users and a content provider connected through the Internet. A one-to-one connection is established in the Internet using TCP / IP. It is a communication technology used in fields such as video conferencing and Internet broadcasting (VoD, AoD) by improving the load of the transmission server due to the increase in the data transmission amount and the traffic congestion of the unicast transmission server. In addition, due to the rapid development of wireless communication technology, the services provided by the mobile communication system or the wireless Internet are developing into multicasting multimedia communication that transmits not only voice services but also large data such as packet data and circuit data. Accordingly, there is a broadcast / multicast service that provides a service from one data source to a plurality of user equipments to support the multicasting multimedia communication. The broadcast / multicast service is a cell broadcast service, a message-oriented service, and a multicast / broadcast service (MBMS) that supports multimedia such as real-time video, audio, still images, and text. Service).

In addition, the group management of the conventional multicast broadcast service has been developed around the wired network, and in the mobile communication and wireless Internet fields, the multicast service and the group management that are applicable to their systems are used. Since the mobile station does not support the mobility of the mobile station, when the mobile station moves to another radio channel, rerouting occurs again to receive the multicast service, resulting in a waste of bandwidth and an increase in latency of the mobile station. Is occurring. Therefore, multicast service on existing wires for bandwidth range, terminal mobility, limitation of wireless bandwidth compared to wire, omni-directional frequency band and data loss due to frequency distortion, which are characteristics of portable Internet based on IEEE 802.16 wireless technology to be commercialized in the future However, mobile communication (CDMA) and wireless Internet technologies (IEEE 802.11) do not consider these matters, so there is a problem in applying the existing group management technology to the portable Internet network.

The present invention was made to solve the above problems, and an object of the present invention is to manage a new multicast / broadcast service area based on the concept of a multicast broadcast service area for efficient multicast service support and group management in a wireless broadband Internet network. To provide a method.

In the portable Internet network according to the present invention for achieving the above object, a method for managing a multicast / broadcast service area includes: A) a terminal subscriber station for requesting and authenticating a predetermined identifier of a multicast service to be received by the terminal subscriber station; Transmitting a request message to a base station (BS); B) transmitting, by the BS, an authentication request message for a terminal subscriber station to which the predetermined identifier is to be serviced to a server performing authentication key assignment / management / authentication; C) the server sending an authentication response message for the terminal subscriber station (MSS) to the base station (BS); D) Upon normal authentication of the MSS, the base station (BS) sends the MBS Zone extend message for the predetermined identifier to the MBS server managing the predetermined identifier and the base station for the multicast service. Requesting to join the MBS Zone; E) registering, by the MBS server, the base station (BS) as a receiver to be provided with the predetermined identifier multicast service and managing it as a table; F) transmitting, by the MBS server, an ACK message to the base station (BS); G) registering, by the BS receiving the ACK message, the predetermined identifier and the MSS in a table containing information on the multicast service received by the BS; And H) MSS1 receives through the SA contracted for the multicast service data that BS1 broadcasts within its BS zone.

Hereinafter, a preferred embodiment of a method for managing a multicast broadcast service area in a wireless broadband internet network according to the present invention will be described in detail with reference to the accompanying drawings.

First, the terms used in the present invention are summarized as follows. The terms defined below will be described as abbreviations in the Examples according to the present invention below.

1. MBS: Multicast / Broadcast Service

2. MCID (Multicast CID): Identifier to distinguish multicast service.

2. MBS Zone: Zone that provides multicast service with specific MCID.

3. Subscribe to MBS Zone: Receive multicast service with specific MCID identifier

4. Leave MBS Zone: Stop the multicast service with the specific MCID identifier.

5. MBS Server: Server that manages MCID and BS for multicast service

6. BS (Base Station): Equipment (base station) that supports MSS wireless access

7. BS zone: Geographic area on the radio managed by BS

8. MSS: Mobile Subscriber Station

9. Authentication and Service Authorization (ASA): Service and user authentication for MSS

10. ASA Server: Server that grants / manages / authenticates unique authentication key for each MSS

Next, the conditions required for the respective devices in order to implement the present invention will be described.

First, the MSS must be able to receive or request a list of MCIDs from the MBS server or BS, and must be able to transmit a message for stopping the multicast service.

In addition, the MBS server must manage list information of the BSs receiving the multicast service flow ID (MCID), and each time a new MCID is added to the MBS management table by requesting the BSs from the MCID list. A new MCID message must be sent and an MCID is allocated per multicast service. In addition, the MBS server may store contents providing a multicast service, or a media server in the vicinity thereof, and in this case, message exchange with the MBS server is required.

The BS must maintain a table of the MCID list transmitted from the MBS server and information of the MSS receiving each MCID service in its area, and store the MCID list provided from the MBS server for a predetermined time. In addition, the BS should periodically update the MCID list through the new MCID message transmitted from the MBS server.

Finally, the ASA server should be able to authenticate the user and service use for the MSS in the MBS zone.

1 is a diagram illustrating a procedure of a BS joining an MBS zone during an MBS zone extension according to an embodiment of the present invention, FIG. 2 is a diagram illustrating a message flow of FIG. 1 according to an embodiment of the present invention, and FIG. 3. Is a flowchart illustrating the operation of FIGS. 1 and 2 according to an embodiment of the present invention.

Hereinafter, the detailed operation will be described with reference to FIGS. 1 to 3.

First, BS1 is not subscribed to the MBS zone, but has an MCID list provided by MBS through an Advertisement message periodically provided by the MBS server.

MSS1 obtains the MCID list for the multicast service (MBS Zone) provided by the MBS server from BS1 and wants to receive the multicast service having the identifier of MCID # 1 from the received list.

1. MSS1 sends request message (MCID, SA related information, etc.) to BS1 for authentication and request for MCID # 1 of multicast service to receive.

2. BS1 sends an authentication request message for MSS1 to receive MCID # 1 to ASA server.

3. The ASA server sends a SA response message for MSS1 to BS1.

4. If MSS1 is successfully authenticated, BS1 sends MBS Zone extend message for MCID # 1 to MBS server to request MBS Zone subscription.

5. The MBS server registers BS1 as a receiver to receive MCID # 1 multicast service and manages it as a table.                     

6. The MBS server sends an ACK message to BS1.

7. BS1 receiving the ACK message registers and manages MCID # 1 and MSS (1) in a table containing information on the multicast service received by the BS1.

8. MSS1 is received through the contracted SA for the multicast service data that BS1 broadcasts in its BS zone.

4 is a diagram illustrating a case in which an MSS is connected to an already subscribed BS area during an MBS zone extension according to an embodiment of the present invention, and FIG. 5 is a flowchart illustrating the message of FIG. 2 according to an embodiment of the present invention. It is also.

Hereinafter, the detailed operation will be described with reference to FIGS. 4 and 5.

BS1 is already subscribed to the MBS zone, and when MSS2 enters BS1 area, MSS2 receives the MCID list from BS1 and wants to receive the multicast service of MCID # 1.

The recipient MSS1 of MCID # 1 already exists in the MBS cache table of BS1.

1. MSS2 sends a request message to BS1 for authentication and request for MCID # 1 to receive multicast service.

2. BS1 confirms that MCID # 1 already exists in its MBS cache table.

3. BS1 sends an SA request message for authentication to MSS2 to ASA server.

4. The ASA server sends an authentication SA response message for MSS2.

5. MSS2 is received through the contracted SA for the multicast service data that BS1 broadcasts in its BS zone.

FIG. 6 is a diagram illustrating a case in which an MSS moves to an area subscribed to an MBS zone or an unsubscribed BS area during an MBS zone extension according to an embodiment of the present invention, and FIG. 7 is a view illustrating an embodiment of the present invention. 6 is a diagram illustrating a message flow diagram of FIG. 6.

Hereinafter, detailed operations will be described with reference to FIGS. 6 and 7.

First, when moving to the BS area that is not joined to the MBS zone, MSS2 receiving service of MCID # 1 of BS1 moves to BS2 not joined to the MBS zone of MCID # 1. Follow the procedure in 7. The request message of MCID # 1 of step 1 may be requested (solid line) in the region where MSS2 intersects the region of BS1 and BS2 (or dashed line) after completely entering BS2 region.

On the other hand, if the BS is subscribed to the MBS zone, if the moved BS2 already has the MCID # 1 MBS zone receiver, the MCID # 1 is already registered in the BS2 table and the service receiver for the MCID # 1 is also in the MBS server table. BS2 is also registered. Therefore, the process of FIG. 5 is performed.

FIG. 8 is a diagram illustrating a case in which a BS to which a terminal MSS is joined leaves the MBS zone during MBS zone reduction according to an embodiment of the present invention, and FIG. 9 is a message flow of FIG. 8 according to an embodiment of the present invention. 10 is a flowchart illustrating the operation of FIGS. 8 and 9 according to an embodiment of the present invention.

Hereinafter, the detailed operation will be described with reference to FIGS. 8 to 10.

First, a case in which the last receiver stops service in the BS 1 area subscribed to the MBS zone will be described.

BS1 is subscribed to the MBS zone and maintains an MBS cache table in which a list of MCIDs and information on the MSS receiving each MCID is recorded.

 If MSS1 is the last recipient of MCID # 1 and the service is suspended for normal or special reasons or the SA has expired, if the multicast service data of a specific MCID is not transmitted to BS1 area, BS1 leaves the MBS zone and MBS zone Is reduced.

1. MSS1 stops MCID # 1 service to BS1 and sends a release message to release the SA.

2. BS1 deletes information of MSS1 receiving MCID # 1 from MBS cache table.

3. BS1 sends the MBS zone reduce message for MCID # 1 to the MBS server because it no longer needs to receive the multicast service for MCID # 1.

4. The MBS server deletes BS1 of the MCID # 1 entry from the MBS zone management table.

5. The MBS server sends an ACK message to BS1.

6. BS1 sends an SA release message for MSS1 to the ASA server.

7. The ASA server sends a SA1 expire ACK message to BS1.

8. BS1 sends an SA expire ACK message to MSS1 and MSS1 discards its SA.

On the other hand, when the last receiver in the BS (1) area subscribed to the MBS zone moves during the service, when the MSS1, the last recipient of BS1 moved to another BS area, BS1 no longer detects the transmission and reception of data for MCID # 1 You won't be able to. In this case, after a predetermined time, the MBS zone is reduced through the processes of steps 3 to 7 of FIG. 8.

In the above embodiment, the multicast data transmission of the MBS server will be described. The MBS server may be a media server providing content or may be operated separately from the media server. When separated from the media server, the MBS server provides data to each BS through communication with the media server. The MBS server transmits multicast data only to BSs in the MBS zone of each MCID with information of BSs in the MBS zone divided by the MCID. Even if the sender of the multicast data is the MSS, the MSS sends its data to the BS to which it belongs, and the BS sends the data to the MBS server and acts as if the central server provides the multicast data.

In addition, when the MBS zone list management of the BS is described, the BS periodically requests a list of MBS zones currently provided from the MBS server or obtains the MBS zone through an Advertisement message of the MBS server. By storing the list of MBS zones, the BS can reduce the delay and bandwidth waste when the MSS requests the MBS zone list from the MBS server. When requested by BS, MBS server sends MBS list to BS and sends new MCID message to all BSs that it manages whenever new MCID is added to its MBS management table.

As described above, the multicast / broadcast service area management method in the portable Internet network according to the present invention is a dynamic BS group to support a mobile terminal dynamically reflecting the characteristics of the portable Internet, which is not considered in the existing technology. It is possible to efficiently manage the radio frequency bandwidth in the BS area and to simplify the group registration process for the multicast service through the management of the MBS zone of the BS rather than the terminal.

Claims (2)

A) a terminal subscriber station transmitting a request message to a base station (BS) for authentication and request for a predetermined identifier of a multicast service that the terminal subscriber station wants to receive; B) transmitting, by the BS, an authentication request message for a terminal subscriber station to which the predetermined identifier is to be serviced to a server performing authentication key assignment / management / authentication; C) the server sending an authentication response message for the terminal subscriber station (MSS) to the base station (BS); D) Upon normal authentication of the MSS, the base station (BS) sends the MBS Zone extend message for the predetermined identifier to the MBS server managing the predetermined identifier and the base station for the multicast service. Requesting to join the MBS Zone; E) registering, by the MBS server, the base station (BS) as a receiver to be provided with the predetermined identifier multicast service and managing it as a table; F) transmitting, by the MBS server, an ACK message to the base station (BS); G) registering, by the BS receiving the ACK message, the predetermined identifier and the MSS in a table containing information on the multicast service received by the BS; And H) in the wireless broadband Internet network, characterized in that the subscriber station (MSS) receives through a contracted SA for multicast service data broadcasted by the base station (BS) in its BS zone. How to manage multicast / broadcast service areas. The method of claim 1, wherein the predetermined identifier, A method for managing a multicast / broadcast service area in a wireless broadband internet network, characterized by identifying a multicast zone as an identifier for identifying a multicast service.

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