WO2007124633A1

WO2007124633A1 - METHOD OF PROVIDING MULTI CAST SERVICE BY NETWORK SIDE IN WiMAX MOBILE COMMUNICATION SYSTEM

Info

Publication number: WO2007124633A1
Application number: PCT/CN2006/003738
Authority: WO
Inventors: Daohong Li; Feng Kou; Yunfei Ma
Original assignee: Zte Corporation
Priority date: 2006-04-29
Filing date: 2006-12-30
Publication date: 2007-11-08
Also published as: CN101064925A; CN101064925B

Abstract

A method of providing establishment and releasement of multi cast service by network side in WiMAX mobile communication system is disclosed in the present invention. The method of providing establishment includes the following steps: the mobile station acquires the IP address of multi cast controller and acquires the multi cast conversation information from the multi cast controller; the multi cast controller transmits the multi cast conversation information to the multi cast server; the multi cast server transmits the multi cast conversation information to the main BSC/PCF in the multi cast service zone; then allocates the wireless resource for the mobile station of the main BSC/PCF and slave BSC/PCF; transmits media flow to mobile station through multi cast context server, multi cast server, main BSC/PCF and slave BSC/PCF when providing multi cast service. The present invention could enable MSS acquire multi cast service for the multi cast service of WiMAX and support macro-diversity application by dividing into a main BS and a slave BS in a MBS zone, the present invention could share the channel of radio side and network side better and save the resource.

Description

TECHNICAL FIELD The present invention relates to the field of mobile communications, and more particularly to a method for initiating establishment and release of a multicast service connection on a network side in a WiMAX mobile communication system. Background technique

WiMAX (Worldwide Interoperability for Microware Access Forum) is a Broadband Wireless Access (BWA) technology. The existing network architecture of the WiMAX system is shown in Figure 1. It is divided into the following three layers:

ASN (Access Service Network; access service network;); CSN (Connected Service Network, connected to the monthly service network);

ASP (Application Service Provider, Network Service Provider)

ASN is a series of network function entities that provide users with wireless access, including BS (Base Station, Base) and ASN-GW (Access Service Network Gateway). The functions of the ASN include: providing a layer 2 connection between the MSS (Mobile Subscriber Station) and the BS; the proxy forwards the AAA (Authentication, Authorization, and Accounting, Authentication, Authorization, and Accounting Server) message to the user's home network. For authentication, authorization, and accounting; discovering and selecting the appropriate NSP (Network Service Provider) to access the WiMAX service provision system; providing relay functions for the user's Layer 3 connection establishment (eg , IP address allocation :); Management of wireless resources, etc.

CSN is a series of network functional entities that provide users with IP connections. The features of CSN include:

MSS IP address allocation; Internet access; proxy AAA ( ) and home AAA (Home AAA ) functions; user profile based policy and control; support ASN-CSN tunnel; user billing and operator billing; Inter-CSN tunnel for roaming function; supports Inter-ASN mobility, etc. The third-party provider of the user service or application is called the application service provider ASP; the network formed by the application service provider is called the ASP network; the Internet, that is, the Internet. Multicast streams can be broadcast in a multicast area (called MBS Zone). Users in the MBS Zone can receive multicast services in the MBS Zone after registration (Multicast Broadcast Service, Multicast Broadcasting Service) Affairs). When the MSS moves from one BS to another within one MBS Zone, the MSS does not need to re-establish connection control multicast traffic. In order to enhance the reception performance of the MSS, it is necessary to support a macro diversity function to ensure that multicast service transmissions within a group of BSs are synchronized.

WiMA's current network architecture can only provide unicast services to MSS, and the existing technologies in the packet domain cannot provide multicast data services. WiMAX's air interface specification only mentions the concept of MBS services and macro diversity, and does not define the implementation of MBS services and macro diversity. The applicant has proposed a system for implementing a multicast service in a WiMAX system, but there is currently no method for the network side to initiate a multicast service. SUMMARY OF THE INVENTION The technical problem to be solved by the present invention is to provide a method for providing multicast monthly services in a WiMAX mobile communication system, and specifically to provide a solution for a network side to initiate establishment and release of a multicast service connection. . The invention provides a method for a network side to initiate a multicast service connection in a WiMAX mobile communication system, comprising the following steps: (1) A mobile subscriber station acquires an IP address of a multicast controller, and obtains a multicast session from a multicast controller. Information

(2) the multicast controller sends the multicast session information to the multicast server; (3) establishing a multicast stream channel between the multicast server and the multicast content server; (4) the multicast server will multicast ^ The tongue information is sent to the primary BSC/PCF in the multicast service area; (5) the radio resource is allocated to the mobile subscriber station under the primary BSC/PCF;

(6) Establishing an R8 tunnel between the master BSC/PCF and the slave BSC/PCF; (7) Allocating radio resources from mobile subscriber stations under BSC/PCF;

(8) The primary BSC/PCF answers the multicast server;

(9) The master BSC/PCF initiates a multicast registration request to the multicast server, requesting to establish an R6 tunnel as a bearer channel of the multicast stream; (10) the multicast server returns a multicast registration response, and establishes a bearer channel R6 of the multicast stream. ;

(11) When the multicast service is provided, the media is streamed through the multicast content server, the multicast server, the primary BSC/PCF, and/or from the BSC/PCF to the mobile subscriber station. The above method further includes the step of the network side initiating the release of the multicast service connection:

(12) The multicast server sends an R6 multicast registration update message to the primary BSC/PCF to request the release of the multicast connection;

(13) The primary BSC/PCF receives the release request and returns an R6 multicast registration response to the multicast server;

(14) The main BSC/PCF releases the radio resources between the mobile subscriber stations;

(15) The primary BSC/PCF sends an R6 multicast registration request with the flow identifier to be released and lifetime = 0 to the multicast server; (16) the multicast server releases the information corresponding to the multicast connection, and returns the R6 multicast Registration response to the primary BSC/PCF;

(17) Release the main BSC / PCF and the R8 tunnel from the BSC / PCF;

(18) Release the wireless resources between the mobile station and the mobile subscriber station from the BSC/PCF. Compared with the prior art, the technology of the present invention provides a method for establishing and releasing a multicast service connection for a WiMAX multicast service, so that the MSS can obtain a multicast service. The invention supports the macro diversity function by dividing the primary BS and the secondary BS in one MBS Zone, and can better share the channels on the wireless side and the network side, thereby saving resources. BRIEF DESCRIPTION OF DRAWINGS FIG. 1 is a schematic diagram of a network structure of a WiMAX system; FIG. 2 is a schematic diagram of a network structure of a system according to the present invention; FIG. 3 is a schematic diagram of a multicast area MBS Zone in the system according to the present invention; In the method of the present invention, the network side initiates a process of establishing a multicast service connection; FIG. 5 is a flow of the network side initiated to release the multicast service connection established in FIG. 4 in the method of the present invention; DETAILED DESCRIPTION OF THE INVENTION The present invention provides a multicast/broadcast The service method is applied to the WiMAX system and describes the scenarios and processes in which the user accesses the multicast service, transmits the multicast stream, and releases the multicast connection. The network reference model of the WiMAX system multicast service proposed by the applicant is shown in Figure 2. The model has the following main features:

1. Add the MBS Server function to the ASN-GW to complete the control and management functions related to the multicast service, such as MBS connection ID (MBS Connection IDentifier) allocation and multicast service authorization. The MBS server manages the BSC/PCF (Base Station Controller/Packet Control Function), manages the MBS Zone, does not distinguish users, only records BS information, and BS maintains MSS information.

2. As shown in Figure 3, identify one master BS in one MBS Zone, the corresponding BSC/PCF is called master BSC/PCF (Master BSC/PCF), the other BSs are slave BSs, and the corresponding BSC PCFs are called slaves. BSC PCF (Slave BSC/PCF). The primary BSC/PCF in the MBS Zone can be fixed or flexible depending on the specific implementation strategy. In the main BSC/PCF, the MBS Scheduler entity is added to perform multicast scheduling and framing functions under macro diversity. The multicast service data in the MBS Zone is centrally scheduled by the multicast service scheduler to ensure the synchronization of the multicast data transmission under each BS in the MBS Zone, that is, the specific multicast stream data ASN-GW is only sent to the main The BSC/PCF, the ASN-GW only establishes an R6 tunnel with the primary BSC/PCF. The secondary BSC/PCF only needs to perform R6 signaling interaction with the ASN-GW, and does not need to establish an R6 tunnel. The primary BSC/PCF passes through the R8 tunnel to the secondary BSC. /PCF provides a multicast stream to ensure that the MBS program is not interrupted when the MSS moves under an MBS Zone. 3. Add the MBS Content Provider, the provider or source of the MBS content, which can be provided by the operator.

4. Power Channel The MBS Content Server provides multicast content services for access users of WiMAX systems. The MBS content server can receive multicast content provided by different MBS content providers, combine them and process them, and then forward them to the main BSC/PCF through the ASN-GW.

5. Power-up p MBS Controller (MBS Controller) functional entity, assists the MSS to obtain the content that can be subscribed, and manages the content transfer from the MBS content provider to the MBS content server; and starts and stops the content transmission of the MBS content server.

6. Multicast Router (MR), optional. If tunneling between the MBS content server and the ASN-GW is used, the MR can be omitted.

7. In the original AAA of the system, increase the authentication, authorization, and accounting functions of the MBS service. In brief, the MBS service process includes the following basic steps: Step 1. MSS access to the WiMAX network is successful; Step 2. MSS obtains the IP address of the MBS controller; Step 3. MSS accesses the MBS controller, requests the content information of the multicast service Step 4. Establish the multicast bearer path; Step 5. Transfer the multicast media stream; Step 6. Add the other MSS to the built multicast service; Step 7. Release the multicast bearer path. However, according to different initiators of the business process, the process of establishing and releasing the multicast path is different, and the present invention will describe the establishment and release of the network side in detail. The multicast service flow of the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments, including a process of establishing a multicast service connection, a process of joining a multicast group, and a process of releasing a multicast service connection. As shown in FIG. 4, the process of initiating the establishment of an MBS connection by the network side is described. When the MBS service provider issues a notification or advertisement, the network side needs to initiate the MBS service process. At this time, the MBS server initiates the establishment of the MBS connection. When the network side initiates a service process, an MBS service connection is established in all cells in the MBS Zone coverage area corresponding to the MBS service. For services initiated by the network side, the BS can broadcast media streams within the MBS Zone. Users do not need to actively perform MBS registration, they can watch the program content. The specific process is as follows:

401. The MSS obtains the IP address of the MBS controller, which can be obtained by using a pre-configuration, a short message delivery, or a DHCP (Dynamic Host Configuration Protocol) process.

402. The MSS obtains the MBS session information from the MBS controller, and may adopt an HTTP method or the like;

403. Before the program starts, the MBS controller sends the monthly AAA ^fc MBS session information to the MBS server;

404. A multicast stream channel is established between the MBS server and the MBS content server. The MBS server can directly establish a bearer channel with the MBS content server in a tunnel manner, or join the MR-maintained multicast group related to the MBS session by using the IGMP protocol. Medium

405. MBS session information is sent to the main BSC/PCF in the MBS Zone;

406. Allocating radio resources to the MSS under the primary BSC/PCF;

407. Establish an R8 tunnel between the primary BSC/PCF and the secondary BSC/PCF; 408. allocate radio resources between the MSSs under the BSC/PCF;

409. The primary BSC/PCF answers the MBS Server;

410. The primary BSC/PCF initiates a registration request for establishing a bearer channel of the multicast stream, and starts to establish an R6 tunnel;

411. After the primary BSC/PCF receives the registration response, the bearer channel of the multicast stream is established.

412. When the MBS content provider starts to play the program content, the media stream passes the MBS content service. Server, MBS server, master BSC/PCF (or master BSC/PCF to slave BSC/PCF), and finally delivered to MSS. As shown in FIG. 5, the process of initiating release of the MBS connection established in FIG. 4 by the network side is described. For the service initiated by the network side, the network side initiates the release of the bearer channel. For example, when an MBS content provider does not want to continue to issue a notification or the program is finished, the MBS server initiates the release of the R6 multicast tunnel. The specific release process is as follows:

501. The MBS server sends an R6 BC Registration Update message to the primary BSC/PCF, and initiates release of all A10 connections corresponding to the MBS session;

502. The primary BSC/PCF returns an R6 BC Registration Acknowledge, telling the MBS server to accept the release it initiated;

503. The main BSC/PCF releases the radio resources between the MSS and the MSS;

504. The primary BSC/PCF initiates a request to release the R6 connection, and sends an R6 BC Registration Request to the MBS server, carrying the flow label to be released only, and lifetime = 0;

505. The MBS server releases the information corresponding to the MBS connection, and then returns an R6 BC Registration Reply to release the R6 tunnel.

506. Release the R8 track between the master BSC/PCF and the slave BSC/PCF;

507. The release of radio resources between the MSS and the MSS is initiated from the BSC/PCF. The above is only a preferred embodiment of the invention, and is intended to enable those skilled in the art to make or use the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein can be applied to other embodiments without the use of the abilities. Therefore, the present invention is not limited to the embodiments shown herein, but is to be accorded to the broad scope of the principles and novel features disclosed herein.

Claims

A method for a mobile subscriber station to initiate a multi-service service in a WiMA mobile communication system is characterized in that: the mobile subscriber station under the primary base station initiates a multicast service, which specifically includes the following steps:

(1) The mobile subscriber station acquires the IP address of the multicast controller, and obtains multicast session information from the multicast controller;

(2) The mobile subscriber station under the primary base station initiates multicast registration;

(3) The primary BSC/PCF confirms that it has multicast session information and does not need to use key authentication;

(4) The multicast server sends an R6 multicast service response with a multicast session connection identifier to the primary BSC/PCF;

(5) establishing a media stream channel between the multicast server and the multicast content service book;

(6) confirming that the bearer channel of the multicast service exists between the main BSC/PCF and the multicast server;

(7) Allocating radio resources between the main BSC/PCF and the mobile subscriber station;

(8) Establishing the main BSC/PCF and all R8 tunnels from the BSC/PCF in the same multicast area;

(9) The primary BSC/PCF returns a response to the multicast registration to the mobile subscriber station;

(10) When the multicast service is provided, the media is sent to the mobile subscriber station via the multicast content server, the multicast server, and the main BSC/PCF. The method of claim 1, further comprising the step of releasing the multicast service connection initiated by the mobile subscriber station under the primary base station:

(1 1 Xi BSC / PCF sends a multicast service release request message to the multicast server after receiving the exit multicast connection request initiated by the last mobile subscriber station;

(12) the multicast server deletes the corresponding multicast information maintained and returns a response to the multicast service release request;

(13) The multicast server confirms that the BSC/PCF is the last BSC/PCF in the multicast area to receive the multicast service, initiates the release of the R6 tunnel with the primary BSC/PCF, and sends the R6 to the primary BSC/PCF. Register an update message;

(14) The primary BSC/PCF returns an R6 multicast registration response to the multicast server; (15) releasing radio resources between the master BSC/PCF and the mobile subscriber station;

(16) The primary BSC/PCF sends an R6 multicast registration request message with a lifetime = 0 to the multicast service, requesting to release the R6 connection of the multicast service;

(17) The multicast server reclaims the multicast session resource, and returns an R6 multicast registration response, releasing the R6 connection corresponding to the multicast session;

(18) The main BSC/PCF initiates the release of the R8 tunnel from the BSC/PCF;

(19) releasing the multicast connection to the radio resource from the BSC/PCF;

(20) The multicast server releases the media stream channel with the multicast content server after determining that no R6 connection exists. The method according to claim 1 or 2, wherein the mobile subscriber station in the step (1) obtains the IP address of the multicast controller by using a pre-configuration, or a short message delivery, or a DHCP flow mode;

The mobile subscriber station obtains multicast session related information from the multicast controller in HTTP mode. The method according to claim 3, wherein the multicast registration in the step (2) carries a user identifier, a requested program identifier or authentication information. The method of claim 4, wherein the step (3) further comprises: when the primary BSC/PCF has a multicast session related information and does not need to use the key authentication.

(3-1) The primary BSC/PCF sends an R6 multicast service request to the multicast server;

(3-2) The multicast server sends a RADIUS access request to the serving AAA;

(3-3) The service AAA determines that the user has the right to receive the requested content, and forwards the RADIUS access request to the multicast controller;

(3-4) after the multicast controller determines that the registration request of the user is legal according to the user information, the multicast controller returns a RADIUS access accept message to the service AAA;

(3-5) The service AAA returns a RADIUS access accept message to the multicast server. The method according to claim 5, wherein in the step (5), when the media stream channel is established between the multicast server and the multicast content server, the multicast server is directly established with the multicast content server by using a tunnel mode. Bear the channel, or join the multicast route by using a multicast protocol Implemented in the multicast group maintained by the multicast session. The method of claim 6, wherein the step (6) comprises:

If the primary BSC/PCF has established a bearer channel for the multicast IP stream with the multicast server, the R6 tunnel between the multicast server and the primary BSC/PCF is no longer established;

If there is no bearer channel between the primary BSC/PCF and the multicast server, the primary BSC/PCF sends an R6 multicast registration request to the multicast server, and the multicast server returns an R6 multicast registration response to complete the establishment of the bearer channel. A method for initiating a multicast service by a mobile subscriber station in a WiMAX mobile communication system is characterized in that it is initiated by a mobile subscriber station under the base station, and specifically includes the following steps:

(2) Initiating multicast registration from a mobile subscriber station under the base station;

(3) Confirming the information related to the multicast session from the B SC / PCF without using the key authentication;

(4) The multicast server sends an R6 multicast service response with a multicast session connection identifier from the BSC/PCF;

(5) establishing a media stream channel between the multicast server and the multicast content server;

(6) confirming that the multicast server has a bearer channel with a multicast service between the primary BSC/PCF in the multicast area;

(7) Establishing an R8 tunnel between the main BSC/PCF and the BSC/PCF;

(8) allocating radio resources from the BSC/PCF to the mobile subscriber station;

(9) Returning from the BSC/PCF to the mobile subscriber station a response to accept the multicast registration;

(10) When the multicast service is provided, the media is sent to the mobile subscriber station via the multicast content server, the multicast server, the main BSC/PCF, and the BSC/PCF. The method of claim 8 further comprising the step of releasing the multicast service connection initiated by the mobile client station under the base station:

(11) after receiving the exit multicast connection request initiated by the last mobile subscriber station under the BSC/PCF, sending a multicast service release request message to the multicast server; (12) The multicast server deletes the corresponding multiple messages maintained, and returns a response to the ^^^ release request;

(13) The multicast server confirms that the BSC/PCF is the last BSC/PCF receiving the multicast service in the multicast area, initiates the release of the R6 tunnel with the primary BSC/PCF, and sends the R6 more to the primary BSC/PCF. "Register update message;

(14) The primary BSC/PCF returns an R6 multicast registration response to the multicast server;

(15) releasing the multi-plug connection radio resource under the main BSC / PCF;

(16) The primary BSC/PCF sends a lifetime 0 R6 multicast registration request message to the multicast service, requesting to release the R6 connection of the multicast service;

(18) The main BSC/PCF initiates the release of the R8 tunnel from the BSC/PCF;

(19) releasing radio resources from the BSC/PCF and the mobile subscriber station;

(20) The multicast server releases the media stream channel with the multicast content server after determining that no R6 connection exists. The method according to claim 8 or 9, wherein the mobile subscriber station in the step (1) obtains the IP address of the multicast controller by using a pre-configuration, or a short message delivery, or a DHCP flow mode;

The mobile subscriber station obtains multicast session related information from the multicast controller in HTTP mode. The method according to claim 10, wherein said multicast registration in said step (2) carries a user identification, a requested program identification or authentication information. The method according to claim 11, wherein when the primary BSC/PCF has a multicast session related information and does not need to use key authentication, the step (3) further includes:

(3-1) sending an R6 multicast service request from the BSC/PCF to the multicast server;

(3-2) The multicast server sends a RADIUS access request to the serving AAA;

(3-3) The service AAA determines that the user has the right to receive the requested content, The broadcast controller forwards the RADIUS access request;

( 3-5 ) Service AAA returns a RADIUS Access Accept message to the multicast server. The method according to claim 12, wherein when the media stream channel is established between the multicast server and the multicast content server in the step (5), the multicast server uses the tunnel mode to directly and multicast the content. The server establishes a bearer channel, or joins to a multicast group maintained by the multicast router and associated with the multicast session using a multicast protocol.

14. The method according to claim 13, wherein the step (6) comprises:

If the multicast server has established a bearer channel for the multicast IP stream with the primary BSC/PCF, the R6 tunnel between the multicast server and the primary BSC/PCF is no longer established;

If there is no bearer channel between the multicast server and the primary BSC/PCF, the multicast server sends a multicast service indication message to the primary BSC/PCF, and the primary BSC/PCF sends the R6 multicast to the multicast server after responding to the multicast service indication message. After registering the request, the multicast server returns to the R6 multicast registration response and then completes the establishment of the multicast bearer channel.

15. The method according to claim 14, wherein the step (7) comprises:

Establish an R8 tunnel between the BSC / PCF and the main BSC / PCF to which the mobile subscriber station belongs;

Establish other R8 tunnels from the BSC/PCF to the primary BSC/PCF.