CN1956451A

CN1956451A - Method for implementing conference start in multimedia broadcast/multicase service

Info

Publication number: CN1956451A
Application number: CNA2005101183161A
Authority: CN
Inventors: 张鹏; 段昌
Original assignee: Huawei Technologies Co Ltd
Current assignee: Huawei Technologies Co Ltd
Priority date: 2005-10-28
Filing date: 2005-10-28
Publication date: 2007-05-02
Anticipated expiration: 2025-10-28
Also published as: CN1956451B

Abstract

This invention discloses a method for starting dialogs in MBMS, in which, in the I-WLAN, the upper reach node processing the MBMS service sends a dialog attribute to the lower reach node in the relationship of mutual upper and lower reach nodes, the lower reach node stores the received attribute to control the session in the process. This invention provides a dialog start flow in the MBMS in the I-WLAN and provides multiple modes.

Description

A kind of method that realizes that session begins in the multimedia broadcast/group broadcast service

Technical field

The present invention relates to multimedia broadcasting/broadcast technology, especially refer to a kind of based on intercommunicated wireless local area network (I-WLAN, Interworking Wireless Local Area Network), realize the method that session begins in the multimedia broadcast/group broadcast service (MBMS, Multimedia Broadcast/Multicast Service).

Background technology

Along with the development of 3G (Third Generation) Moblie technology, 3G (Third Generation) Moblie can provide than the more service of high data rate of second generation mobile communication, thereby supports the multiple business form, downloads, browses at a high speed services such as Internet network such as visual telephone, picture.Wherein have a class business features to be: this business can be simultaneously give subscribed in the wireless network should business the user send such as weather forecast, news film, the sports tournament collection of choice specimens or the like.The characteristics of utilizing these business to send simultaneously, 3-G (Generation Three mobile communication system) have been introduced the notion of broadcast/group broadcast.

In the broadcasting/packet service, for an intermediate node, no matter its downstream comprises the node what expectations receive data, and its upstream node always sends a piece of data to this intermediate node; After this intermediate node is received data, the number of nodes that receives data according to its downstream expectation duplicates this data, and distribute this data to the node that each expectation of its downstream receives these data, like this, each bar branch of broadcasting/packet service transfer of data tree all has only a piece of data to transmit, take a transfer resource, the transfer of data of root node and its downstream node also is like this.The distinctive points of multicast service and broadcasting service only is: multicast service only sends corresponding information to the user who has subscribed to some information, and the broadcasting service then user of all in wireless network sends information.As seen from the above description, provide identical information to a large number of users simultaneously, can greatly save Internet resources by multicast/broadcast is professional.

Fig. 1 is the wireless network architecture schematic diagram that prior art is supported broadcasting/packet service, as shown in Figure 1, in the existing third generation partner program (3GPP), support the wireless network architecture of broadcasting/packet service to comprise: broadcast/multicast service center (BM-SC) is also referred to as the broadcasting/packet service server, BM-SC is by Gmb interface or Gi interface and service plane function (TPF) critical point GPRS Support Node (GGSN, Gateway GPRS Support Node) link to each other, a BM-SC can link to each other with a plurality of GGSN; GGSN links to each other by Gn/Gp interface and Serving GPRS Support Node (SGSN, Serving GPRS Support Node), and a GGSN can link to each other with a plurality of SGSN; SGSN can link to each other with universal mobile telecommunications system (UMTS) land radio access web (UTRAN) by the Iu interface, UTRAN links to each other with user terminal (UE) by the Uu interface then, SGSN also can strengthen wireless access network (GERAN) by Iu/Gb interface and global system for mobile communications (GSM) and link to each other, and GERAN links to each other with UE by Um Interface then.Wherein, GGSN and SGSN belong to the node in the core net in the wireless network (CN).

The network configuration that provides from Fig. 1 as can be seen, in order to support the MBMS business, in 3-G (Generation Three mobile communication system), increased mobile network functional entity-broadcast/multicast service center, be BM-SC, described BM-SC is the inlet of content provider/multicast broadcast source, be used for authorizing and initiating the MBMS business, and plan transmits the MBMS content to schedule at mobile network.In addition, on functional entitys such as UE, UTRAN, GERAN, SGSN, GGSN, increased the function relevant with MBMS.BM-SC for the MBMS customer service provide and transmission provides function.Can be used as an access point that in public land mobile net (PLMN), is used for MBMS content delivery, mandate and initiation MBMS bearer service, and can be used for scheduling and send the MBMS transmission.Fig. 2 is that prior art BM-SC forms schematic diagram, as shown in Figure 2, BM-SC is as a functional entity, be necessary for the MBMS customer service and exist, comprise five functions: member's function (Membership Function), session and sending function (Session And TransmisionFunction), agency and transfer function (Proxy And Tranport Function), professional declaration function (Service Announcement Function) and safety function (Security Function).

It is a process in the processing procedure that relates to of MBMS business that session begins (Session Start), begins in session that BM-SC is ready to transfer of data in the process, and informing network is set up the bearing resource of corresponding core net and Access Network.The conversation procedure of MBMS comprises: session begins process, process and conversation end process are carried out in session.Wherein, the MBMS session process of beginning has different situations: for multicast MBMS bearer service, the registration of SGSN and GGSN is undertaken by MBMS activating multicast service process and MBMS registration process.For the broadcasting MBMS bearer service, the registration of SGSN and GGSN is undertaken by oam (OAM) platform, being that MBMS bearer context on BM-SC and the GGSN is disposed by OAM, therefore, be the downstream node listing of each broadcasting MBMS bearer service definition BM-SC and GGSN.

At present in the wireless network based on support broadcasting/packet service shown in Figure 1, the method that the MBMS session begins as shown in Figure 3, Fig. 3 is that prior art is supported the flow chart that the MBMS session begins in the wireless network of broadcasting/packet service, this method may further comprise the steps:

The GGSN that step 301:BM-SC preserves in " downstream node listing " parameter in its corresponding MBMS bearer context sends session and begins request (Session Start Request) message, the indication transmission that is about to begin, and the status attribute that the MBMS bearer context is set is for activating.Session attributes such as interim horde group id (TMGI), service quality (QoS), MBMS business domains, session identification, the length of estimating this session, broadcast/group broadcast indication are provided in this request, have also carried the 2G/3G indication.

After step 302:GGSN receives that session begins request message, the session attribute that provides in this message is provided in the MBMS bearer context, the status attribute that the MBMS bearer context is set is activation, and begins response (Session Start Response) message to session of BM-SC transmission.

The SGSN that step 303:GGSN preserves in " downstream node listing " parameter in its corresponding MBMS bearer context sends a MBMS session and begins request (MBMS Session Start Request) message.Session attributes such as TMGI, QoS, MBMS business domains, session identification, the length of estimating this session, broadcast/group broadcast indication are provided in this request, have also carried the 2G/3G indication.

After step 304:SGSN receives that the MBMS session begins request message, in the MBMS bearer context, preserve session attribute and 2G/3G indication, and the status attribute that the MBMS bearer context is set is activation, send a MBMS session to GGSN and begin response (MBMS Session Start Response) message, the tunnel destination node sign (TEID) that is used for load plane is provided in this message, has been used for GGSN and sends the MBMS data.

In this step, for the MBMS broadcasting service, if SGSN does not also have corresponding MBMS bearer context, SGSN will create the MBMS bearer context earlier.

Step 305:SGSN is to each BSC/RNC that links to each other with this SGSN, send a MBMSSession Start Request message, session attributes such as TMGI, QoS, MBMS business domains, session identification, the length of estimating this session, broadcast/group broadcast indication are provided in this request.2G/3G indication is used to determine the MBMS session to begin request message by SGSN whether only to issue BSC, perhaps only issue RNC, perhaps issue BSC and RNC.

BSC and RNC under step 306～step 307:Iu pattern are kept at the session attribute in the MBMS business contexts, and the status attribute that the MBMS business contexts is set responds a MBMS Session Start Request message then and gives SGSN for activating.RNC comprises TEID to begin in the response message in the MBMS session, is used for the Iu load plane that this SGSN sends the MBMS data.

For the BSC under the Gb pattern of not serving the MBMS business domains, can not preserve session attribute, and the MBMS business contexts is not set to activate.

A BSC/RNC has received a plurality of MBMS sessions and has begun request message, carries Iu load plane parameter in the message, and the MBMS session that this BSC/RNC only returns a success begins response message, is used to set up an Iu planes carry that arrives a SGSN.

Afterwards, BSC/RNC just sets up in the MBMS business domains and is used for the Radio Resource of MBMS transmission data to necessity of UE interested.

In this step, for the MBMS multicast service, SGSN may comprise a route district (RA) tabulation, and this RA tabulation comprises grouping mobile management (PMM) idle UE that at least one has activated this MBMS bearer service, and this RA tabulation also can be sky.For the MBMS broadcasting service, if BSC/RNC does not also have corresponding MBMS bearer context, BSC/RNC creates the MBMS bearer context earlier.

Session among the existing MBMS begins flow process, all designs at the GPRS/UMTS system, and the Access Network of consideration is GERAN/UTRAN, and it also is to carry out at GERAN/UTRAN shown in Figure 1 and SGSN-GGSN framework that session begins flow process.

Along with the user is more and more higher to the requirement of wireless access rate, WLAN (wireless local area network) (WLAN, Wireless Local Area Network) is arisen at the historic moment, and WLAN can provide wireless data access at a high speed in more among a small circle.WLAN (wireless local area network) comprises multiple different technologies, a widely used technical standard is IEEE 802.11b at present, IEEE 802.11b adopts the 2.4GHz frequency range, the maximum data transmission rate can reach 11Mbps, use the IEEE 802.11g and bluetooth (Bluetooth) technology in addition of this frequency range, wherein, IEEE 802.11g the maximum data transmission rate can reach 54Mbps.Other new technology such as IEEE802.11a and ETSI BRAN Hiperlan2 use the 5GHz frequency range, and maximum transmission rate also can reach 54Mbps.

Although multiple different wireless access technology is arranged, most of WLAN is used for transmitting internet agreement (IP) packet data package.For a Wireless IP network, its concrete WLAN access technology that adopts generally is transparent for the IP on upper strata, the basic structure of Wireless IP network all is to utilize access point (AP) to finish the wireless access of user terminal, connects to form the IP transmission network by network control and connection device.

Rise and development along with the WLAN technology, WLAN and various wireless mobile communication network, such as: the intercommunication of GSM, code division multiple access (CDMA) system, Wideband Code Division Multiple Access (WCDMA) (WCDMA) system, Time Division-Synchronous Code Division Multiple Access (TD-SCDMA) system, CDMA2000 system is just becoming the emphasis of current research.

In 3GPP standardization body, the WLAN user terminal can pass through WLAN access network (WLAN AN, WLAN Access Network) links to each other with internet (Internet), Intranet (Intranet), can also be connected with 3GPP home network (3GPPHome Network) or 3GPP visited network (3GPP Visited Network) via the WLAN access network.Here, 3GPP system and WLAN intercommunication are called interworking WLAN again, i.e. I-WLAN (InterworkingWLAN).The WLAN user terminal is connected with 3GPP home network or 3GPP visited network via the WLAN access network, specifically is divided into following several situation:

Fig. 4 is the non-roaming structural representation of prior art I-WLAN, when the WLAN user terminal inserts in this locality, links to each other with the home network of 3GPP via the WLAN access network;

Fig. 5 a is a kind of I-WLAN roaming of prior art structural representation, Fig. 5 b is the another kind of I-WLAN roaming of a prior art structural representation, when roaming, link to each other with the 3GPP visited network via the WLAN access network, part entity in the 3GPP visited network respectively with the 3GPP home network in corresponding entity interconnection, such as 3GPP authentication and authorization charging (AAA) agency in the 3GPP visited network and 3GPP authentication and authorization charging (AAA) server in the 3GPP home network; Packet data gateway (PDG, Packet Data Gateway) in WLAN (wireless local area network) IAD in the 3GPP visited network (WAG, WLAN Access Gateway) and the 3GPP home network or the like.Among Fig. 5 a, the aaa server in the 3GPP home network is connected with WAG by the agency of the AAA in the 3GPP visited network; Among Fig. 5 b, the aaa server in the 3GPP home network is connected with PDG, WAG by the AAA agency in the 3GPP visited network.

In I-WLAN, adopt end to end between WLAN UE and the PDG that the IPsec tunnel is connected, after setting up, also just set up in the IPsec tunnel between WLAN UE and PDG the Radio Resource of WLAN UE.Protocol stack between WLAN UE and the PDG as shown in Figure 6, Fig. 6 is the protocol stack schematic diagram between prior art WLANUE and the PDG.

As can be seen from Figure 6, each WLAN UE has the IP address of two different purposes, one of them IP address is the IP address, this locality (Local) that is positioned at transmission (Transport) IP layer, this Local IP address is used for addressing route between WLAN UE and PDG, is invisible and unrecognizable to the outer net beyond the PDG; Another IP address is the Remote IP address that is positioned at far-end (Remote) IP layer, this Remote IP address is used for communicating with outer net, also we can say, from outer net, PDG is that packet arrives preceding last router of WLAN UE, promptly, has only the distance of " jumps " between PDG and the WLAN UE from outer net.

From foregoing description as seen, as a kind of broadband access technology, WLAN can provide the data, services of higher rate, can show the advantage of MBMS business better to WLAN UE, therefore, MBMS is introduced WLAN be necessary.

As seen session from existing MBMS shown in Figure 3 begins flow process, existing session begins flow process and designs at the GPRS/UMTS system, be to carry out at GERAN/UTRAN shown in Figure 1 and SGSN-GGSN framework, the Access Network of considering is GERAN or UTRAN, do not consider that WLAN is as Access Network, therefore, under the I-WLAN framework, do not provide the session of MBMS to begin flow process as yet at present.

Summary of the invention

In view of this, main purpose of the present invention is to provide a kind of method that realizes that session begins in the multimedia broadcast/group broadcast service, and this method can realize that the session of MBMS business begins process based on intercommunicated wireless local area network (I-WLAN).

For achieving the above object, technical scheme of the present invention specifically is achieved in that

A kind of method that realizes that session begins among the multimedia broadcast/group broadcast service MBMS, this method is: in intercommunicated wireless local area network I-WLAN, the upstream node of handling the MBMS business to self each other the downstream node of upstream and downstream node relationships send session attribute, downstream node receives and the store session attribute.

After described downstream node received session attribute, this method also comprised: described downstream node to self each other the upstream node of upstream and downstream relation return response.

The method of described transmission session attribute is:

Described upstream node is carried at session with the session attribute to begin in the request message, and this session is begun request message sends to described downstream node;

Or described upstream node is carried at the session attribute that session begins in the request message and this session is begun request message sends to portion downstream node in the described downstream node, and at the residue downstream node deploy session attribute of described downstream node.

The method of described transmission session attribute is: upstream node is carried at the session that session begins process with the session attribute and begins to send in the request message downstream node, and the bearing protocol that then described session begins the message in the process is: Diameter, radius protocol, http protocol, wap protocol, Session Initiation Protocol or custom protocol.

The method of described transmission session attribute is: upstream node is carried at session that session begins process with the session attribute to begin to send in the request message portion downstream node and combines at residue downstream node deploy session attribute, and the method for then described deployment session attribute is:

By the service quality QoS modification process deployment session attribute that has licensing process, reauthorization process, policy update process or initiate by aaa server.

The bearing protocol of the message that is adopted in the described deployment session attribute is: the agreement or the custom protocol of Diameter, radius protocol, http protocol, wap protocol, Session Initiation Protocol, I-WLAN special use.

The upstream node and the downstream node of the described node relationships of upstream and downstream each other are:

Broadcast/multicast service center BM-SC and packet data gateway PDG, BM-SC and 3GPP authentication and authorization charging aaa server, aaa server and PDG, aaa server and WLAN (wireless local area network) IAD WAG, aaa server and WLAN access network WLAN AN, PDG through aaa server and WAG, PDG through aaa server and WLAN AN, PDG and WAG or WAG and WLAN AN.

After arbitrary downstream node in the described downstream node receives that described session begins request message, this method also comprises: this downstream node sends session to the WLAN user terminal and begins event notice, and begins event response according to the session that the WLAN user terminal returns and determine whether to send the MBMS data to this WLAN user terminal;

Show agreement if session begins event response, then this downstream node sends follow-up MBMS data to this WLAN user terminal; Demonstration disagrees with that then this downstream node does not send follow-up MBMS data to this WLAN user terminal if session begins event response.

The upstream node of the described node relationships of upstream and downstream each other and downstream node are BM-SC and aaa server, aaa server and PDG, aaa server and WAG, and aaa server and WLAN AN; And set up the IPsec tunnel between WLAN user terminal and PDG, this method specific implementation may further comprise the steps:

A1.BM-SC sends the session of carrying first session attribute to aaa server and begins request message, and aaa server is stored first session attribute that receives and returned session to BM-SC and begins response message;

First session attribute that the B1.AAA server update receives is also replaced, and the session attribute after upgrading is carried at session begins to send in the request message PDG, and PDG stores the session attribute that receives and returns session to aaa server and begins response message;

The session that the C1.AAA server will carry the session attribute after the renewal begins request message and sends to WAG, and the session attribute that the WAG storage receives also returns session to aaa server and begins response message;

The session that the D1.AAA server will carry the session attribute after the renewal begins request message and sends to WLAN AN, and the session attribute that WLAN AN storage receives also returns session to aaa server and begins response message.

Described aaa server is all aaa servers in the downstream node list parameter in the MBMS bearer context of storing among the BM-SC.

In steps A 1, receive after session begins request message at described aaa server, this method also comprises: if current MBMS business is the broadcasting MBMS bearer service, then described aaa server is created a MBMS bearer context, and the tabulation of the downstream node in the store M BMS bearer context;

In step B1, described PDG receives session to begin after the request message, and this method also comprises: if current MBMS business is the broadcasting MBMS bearer service, then described PDG creates a MBMS bearer context;

In step C1, described WAG receives session to begin after the request message, and this method also comprises: if current MBMS business is the broadcasting MBMS bearer service, then described WAG creates a MBMS bearer context;

In step D1, described WLAN AN receives session to begin after the request message, and this method also comprises: if current MBMS business is the broadcasting MBMS bearer service, then described WLAN AN creates a MBMS bearer context.

Described PDG is all PDG in the downstream node list parameter in the MBMS bearer context of storing in the aaa server;

Described WAG is all WAG in the downstream node list parameter in the MBMS bearer context of storing in the aaa server;

Described WLAN AN is all the WLAN AN in the downstream node list parameter in the MBMS bearer context of storing in the aaa server.

The upstream node of the described node relationships of upstream and downstream each other and downstream node be BM-SC and PDG, PDG through aaa server and WAG, and PDG is through aaa server and WLAN AN; Set up the IPsec tunnel between WLAN user terminal and PDG, this method specific implementation may further comprise the steps:

A2.BM-SC sends the session of carrying first session attribute to PDG and begins request message, and PDG stores first session attribute that receives and returns session to BM-SC and begins response message;

B2.PDG upgrades first session attribute that receives and replaces, session attribute after upgrading is carried at session begins to send to WAG via aaa server in the request message, WAG stores the session attribute that receives and returns session via aaa server to PDG and begins response message;

The session that C2.PDG will carry the session attribute after the renewal begins request message and sends to WLAN AN via aaa server, and the session attribute that WLAN AN storage receives also returns session via aaa server to PDG and begins response message.

Described PDG is all PDG in the downstream node list parameter in the MBMS bearer context of storing among the BM-SC;

The upstream node of the described node relationships of upstream and downstream each other and downstream node are BM-SC and aaa server, aaa server and PDG, PDG and WAG, and WAG and WLAN AN; And set up the IPsec tunnel between WLAN user terminal and PDG, this method specific implementation may further comprise the steps:

A3.BM-SC sends the session of carrying first session attribute to aaa server and begins request message, and aaa server is stored first session attribute that receives and returned session to BM-SC and begins response message;

First session attribute that the B3.AAA server update receives is also replaced, and the session attribute after upgrading is carried at session begins to send in the request message PDG, and PDG stores the session attribute that receives and returns session to aaa server and begins response message;

The session that C3.PDG will receive carries the session attribute after the renewal begins request message and sends to WAG, and the session attribute that the WAG storage receives also returns session to PDG and begins response message;

The session that D3.WAG will receive carries the session attribute after the renewal begins request message and sends to WLAN AN, and the session attribute that WLAN AN storage receives also returns session to WAG and begins response message.

In steps A 3, receive after session begins request message at described aaa server, this method also comprises: if current MBMS business is the broadcasting MBMS bearer service, then described aaa server is created a MBMS bearer context, and the tabulation of the downstream node in the store M BMS bearer context;

In step B3, described PDG receives session to begin after the request message, this method also comprises: if current MBMS business is the broadcasting MBMS bearer service, then described PDG creates a MBMS bearer context, and the tabulation of the downstream node in the store M BMS bearer context;

In step C3, described WAG receives session to begin after the request message, this method also comprises: if current MBMS business is the broadcasting MBMS bearer service, then described WAG creates a MBMS bearer context, and the tabulation of the downstream node in the store M BMS bearer context;

In step D3, described WLAN AN receives session to begin after the request message, and this method also comprises: if current MBMS business is the broadcasting MBMS bearer service, then described WLAN AN creates a MBMS bearer context.

Described WLAN AN is all WLANAN in the downstream node list parameter in the MBMS bearer context of storing in the aaa server.

A4.BM-SC sends the session of carrying first session attribute to aaa server and begins request message, and aaa server is stored the session attribute that receives and returned session to BM-SC and begins response message;

First session attribute that the B4.AAA server update receives is also replaced, and the session attribute after upgrading is carried at session begins to send in the request message PDG, and PDG stores the session attribute that receives and returns session to aaa server and begins response message;

Session attribute after the C4.AAA server will upgrade respectively is deployed to WAG and WLANAN by the QoS modification process that has licensing process, reauthorization process, policy update process or initiated by aaa server.

In steps A 4, receive after session begins request message at described aaa server, this method also comprises: be the broadcasting MBMS bearer service if current MBMS is professional, then described aaa server is created a MBMS bearer context.

A5.BM-SC sends the session of carrying first session attribute to aaa server and begins request message, and aaa server is stored the session attribute that receives and returned session to BM-SC and begins response message;

First session attribute that the B5.AAA server update receives is also replaced, and the session attribute after upgrading is carried at session begins to send in the request message PDG, and PDG stores the session attribute that receives and returns session to aaa server and begins response message;

Session attribute after C5.PDG or BM-SC will upgrade respectively via aaa server is deployed to WAG and WLAN AN by the QoS modification process that has licensing process, reauthorization process, policy update process or initiated by aaa server.

The upstream node of the described node relationships of upstream and downstream each other and downstream node be BM-SC and PDG, PDG through aaa server and WAG, and PDGAAA server and WLAN AN; And set up the IPsec tunnel between WLAN user terminal and PDG, this method specific implementation may further comprise the steps:

A6.BM-SC sends the session of carrying first session attribute to PDG and begins request message, and PDG stores first session attribute that receives and returns session to BM-SC and begins response message;

B6.PDG upgrades first session attribute that receives and replaces;

Session attribute after the C6.AAA server will upgrade respectively is deployed to WAG and WLANAN by the QoS modification process that has licensing process, reauthorization process, policy update process or initiated by aaa server.

A7.BM-SC sends the session of carrying first session attribute to PDG and begins request message, and PDG stores first session attribute that receives and returns session to BM-SC and begins response message;

B7.PDG upgrades first session attribute that receives and replaces;

Session attribute after C7.PDG or BM-SC will upgrade respectively via aaa server is deployed to WAG and WLANAN by the QoS modification process that has licensing process, reauthorization process, policy update process or initiated by aaa server.

This method also comprises: described PDG sends session to the WLAN user terminal and begins event notice, and begins event response according to the session that the WLAN user terminal returns and determine whether to send the MBMS data to this WLAN user terminal.

The method of described renewal first session attribute is: the user ID that will store and Tunnel Identifier are increased in described first session attribute.

Described user ID comprises: IMSI, MSISDN, NAI, SIP URI and tel URI; Described Tunnel Identifier comprises: IPsec SA, SPI, IKE SA, IP address, port numbers and protocol number.

Described first session attribute comprises: the session persistence of interim horde group id TMGI, service quality QoS, MBMS service area, session identification, estimation, broadcast/group broadcast pattern, 2G/3G/WLAN indication and/or the downstream node tabulation of using for PDG.

If the WLAN user terminal is in the roaming working method, the then described information that sends to aaa server is transmitted by the AAA agency.

The value of 2G/3G/WLAN indication is not WLAN in the session attribute that described downstream node is received, then this method also comprises:

Described downstream node continues to send session attribute to the downstream node of self; This downstream node sends the MBMS data that receive to self downstream node;

Or described downstream node does not send session attribute to the downstream node of self; This downstream node abandons the MBMS data that receive;

Or described downstream node do not send session attribute to the downstream node of self, and returns session to self upstream node and begin failure response message assignable cause simultaneously; After this upstream node is received this response, this downstream node is deleted from the downstream node list parameter of self storing.

As seen from the above technical solution, the present invention is based on I-WLAN, the upstream node of handling the MBMS business to self each other the downstream node of upstream and downstream node relationships send session attribute, the session attribute that the downstream node storage receives is so that be used to control session in conversation procedure, realized that by the inventive method the session in the MBMS business begins process, provide the session among the MBMS to begin flow process, the downstream node of promptly handling the MBMS business receives session attribute, and stores this session attribute.The invention provides multiple implementation, had very strong flexibility and practicality.

Description of drawings

Fig. 1 is the wireless network architecture schematic diagram that prior art is supported broadcasting/packet service;

Fig. 2 is that prior art BM-SC forms schematic diagram;

Fig. 3 is that prior art is supported the flow chart that the MBMS session begins in the wireless network of broadcasting/packet service;

Fig. 4 is the non-roaming structural representation of prior art I-WLAN;

Fig. 5 a is a kind of I-WLAN roaming of prior art structural representation;

Fig. 5 b is the another kind of I-WLAN roaming of a prior art structural representation;

Fig. 6 is the protocol stack schematic diagram between prior art WLAN UE and the PDG;

Fig. 7 is that session of the present invention comes into effect example one flow chart;

Fig. 8 is that session of the present invention comes into effect example two flow charts;

Fig. 9 is that session of the present invention comes into effect example three flow charts;

Figure 10 is that session of the present invention comes into effect example four flow charts;

Figure 11 is that session of the present invention comes into effect example seven flow charts.

Embodiment

The same with the application of prior art BM-SC in 3-G (Generation Three mobile communication system), in I-WLAN, BM-SC is the inlet of content provider/multicast broadcast source, be used for authorizing and initiating the MBMS business at mobile network, and plan transmits the MBMS content to schedule, the outlet of BM-SC and aaa server or PDG and user terminal link to each other, and the interface between BM-SC and aaa server or the PDG is followed Diameter, radius protocol, Session Initiation Protocol etc.In addition, on functional entitys such as the WLAN UE that handles the MBMS business, WLAN AN, WAG, PDG, aaa server, increased the function relevant with MBMS, such as conversation control function, be used for receiving and the store session attribute, and subsequent session controlled according to this session attribute.

The present invention in I-WLAN, the upstream node of handling the MBMS business to self each other the downstream node of upstream and downstream node relationships send session attribute, the session attribute that the downstream node storage receives is so that be used to control session in conversation procedure.Here, upstream node send to downstream node session attribute method can for: begin in the request message and send to all downstream nodes by the session attribute being carried at session, make downstream node obtain session attribute; Perhaps the portion downstream node begins request message acquisition session attribute by the session of carrying session attribute from upstream node, and the residue downstream node is by the deployment acquisition session attribute of upstream node.Wherein dispose session attribute and be meant that the QoS modification process of initiating by existing licensing process, reauthorization process, policy update process or aaa server etc. sends session attribute to downstream node.Wherein, the network entity of upstream and downstream node relationships can be each other: BM-SC and PDG, BM-SC and aaa server, aaa server and PDG, aaa server and WAG, aaa server and WLAN AN, PDG through aaa server and WAG, PDG through aaa server and WLAN AN, PDG and WAG, and WAG and WLAN AN.

Among the present invention, session begins the message in the process, as session begin request message, session begins the response message bearing protocol and can be: the agreement of Diameter, radius protocol, http protocol, wap protocol, Session Initiation Protocol or other redetermination.

For making purpose of the present invention, technical scheme and advantage clearer, below with reference to the accompanying drawing preferred embodiment that develops simultaneously, the present invention is described in more detail.

Embodiment one

Fig. 7 is that session of the present invention comes into effect example one flow chart, as shown in Figure 7, four pairs of nodes upstream node and downstream node relation are each other arranged: BM-SC and aaa server, aaa server and PDG, aaa server and WAG, and aaa server and WLAN AN in the present embodiment.In the present embodiment, upstream node begins request message by session the session attribute is sent to downstream node, and BM-SC begins request message by the aaa server initiation session, specifically may further comprise the steps:

Step 701～step 702:BM-SC sends session to its downstream node aaa server and begins request (Session Start Request) message, indicates transfer of data on the horizon, and first session attribute is provided.This session begins request message and sends to all aaa servers in " downstream node tabulation " parameter in the MBMS bearer context.First session attribute that aaa server will receive is stored in this locality, and to BM-SC return session begin the response (Session Start Respond) message.

According to the broadcast/group broadcast pattern of carrying in first session attribute, if current is the broadcasting MBMS bearer service, then aaa server also needs to create a MBMS bearer context, and first session attribute and the downstream node in the MBMS bearer context that storage simultaneously receives are tabulated.

In this step, session begins to carry first session attribute in the request message and can comprise: the session persistence of interim horde group id (TMGI), service quality (QoS), MBMS service area, session identification, estimation, broadcast/group broadcast pattern, the downstream node tabulation of using for PDG and 2G/3G/WLAN indicate etc.Wherein, the downstream node that uses for PDG is tabulated and is only existed when broadcast mode.

Step 703～step 704:AAA server sends session to self downstream node PDG and begins request message, and the session attribute after the renewal is provided.This message sends to all PDG in " downstream node tabulation " parameter in the MBMS bearer context in the aaa server.PDG is stored in this locality with the session attribute that receives, and returns session to aaa server and begin response message.

For the broadcasting MBMS bearer service, PDG also needs to create a MBMS bearer context, and stores the session attribute that receives.

In this step, aaa server as with the direct-connected downstream node of BM-SC, at aaa server when self downstream node sends session and begins request message, need to upgrade the session attribute that receives, the user ID of soon self having stored such as IMSI, MSISDN, NAI, SIP URI, tel URI etc.; Tunnel Identifier such as IPsec SA, SPI, IKE SA, IP address, port numbers, protocol number etc. are increased in the session attribute, and are carried at session and begin to send in the request message downstream node.The session attribute that is stored in aaa server simultaneously replaces with the session attribute after the renewal.

Step 705～step 706:AAA server begins request message to the downstream node WAG transmission session of self, and session attribute is provided.This message sends to all WAG in " downstream node tabulation " parameter in the MBMS bearer context in the aaa server.WAG is stored in this locality with the session attribute that receives, and returns session to aaa server and begin response message.

For the broadcasting MBMS bearer service, WAG also needs to create a MBMS bearer context, and stores the session attribute that receives.

Step 707～step 708:AAA server begins request message to the downstream node WLAN AN transmission session of self, and session attribute is provided.This message sends to all the WLAN AN in " downstream node tabulation " parameter in the MBMS bearer context in the aaa server.WLAN AN is stored in this locality with the session attribute that receives, and returns session to aaa server and begin response message.

For the broadcasting MBMS bearer service, WLAN AN also needs to create a MBMS bearer context, and stores the session attribute that receives.

From as seen above-mentioned, after the session of the process embodiment of the invention one begins process, all obtained session attribute in the network entity of processing MBMS business among the I-WLAN, so that the user controls session in the subsequent session process.

Need to prove, in I-WLAN, because the Radio Resource that the back has just been set up WLAN UE is set up in the IPsec tunnel between WLAN UE and PDG, so begin with the session of prior art in 3-G (Generation Three mobile communication system) that process is different to be, do not need between PDG and WLANUE, to set up again the Radio Resource that is used for the MBMS transmission data here.

Embodiment two

Fig. 8 is that session of the present invention comes into effect example two flow charts, as shown in Figure 8, three pairs of nodes upstream node and downstream node relation is each other arranged in the present embodiment: through aaa server and WAG, and PDG is through aaa server and WLANAN through aaa server and WAG, PDG for BM-SC and PDG, PDG.In the present embodiment, upstream node begins request message by session the session attribute is sent to downstream node, BM-SC begins request message by the PDG initiation session and PDG begins request message by aaa server to WAG and WLAN AN transmission session, specifically may further comprise the steps:

Step 801～step 802:BM-SC begins request message to the downstream node PDG transmission session of self, indicates transfer of data on the horizon, and first session attribute is provided.This session begins request message and sends to all PDG in " downstream node tabulation " parameter in the MBMS bearer context.First session attribute that PDG will receive is stored in this locality, and returns session to BM-SC and begin response message.

For the broadcasting MBMS bearer service, PDG also needs to create a MBMS bearer context, and stores first session attribute that receives.

In this step, session begins to carry first session attribute in the request message and can comprise: the session persistence of TMGI, QoS, MBMS service area, session identification, estimation, broadcast/group broadcast pattern and 2G/3G/WLAN indication etc.

Step 803～step 804:PDG sends session via aaa server to self downstream node WAG and begins request message, and the session attribute after the renewal is provided.This message sends to all WAG in " downstream node tabulation " parameter in the MBMS bearer context in the aaa server.WAG is stored in this locality with the session attribute that receives, and returns session via aaa server to PDG and begin response message.

In this step, PDG is as the direct downstream node of BM-SC, when the downstream node WAG transmission session of self begins request message, need to upgrade the session attribute that receives at PDG, be about to user ID such as IMSI, MSISDN, NAI, SIP URI, tel URI etc.; Tunnel Identifier such as IPsec SA, SPI, IKE SA, IP address, port numbers, protocol number etc. are increased in the session attribute, and are carried at session and begin to send in the request message downstream node WAG.The session attribute that is stored in PDG simultaneously replaces with the session attribute after the renewal.

Step 805～step 806:PDG begins request message via aaa server to the downstream node WLAN AN transmission session of self, and session attribute is provided.This message sends to all the WLAN AN in " downstream node tabulation " parameter in the MBMS bearer context in the aaa server.WLANAN is stored in this locality with the session attribute that receives, and returns session via aaa server to PDG and begin response message.

In this step, PDG is as the direct downstream node of BM-SC, at PDG when self downstream node WLAN AN sends session and begins request message, need be with user ID such as IMSI, MSISDN, NAI, SIP URI, tel URI etc.; Tunnel Identifier such as IPsec SA, SPI, IKE SA, IP address, port numbers, protocol number etc. are increased in the session attribute, and are carried at session and begin to send in the request message WLAN AN.

Similarly, after the session of the process embodiment of the invention two begins process, all obtained session attribute in the network entity of processing MBMS business among the I-WLAN, so that the user controls session in the subsequent session process.

Embodiment three

Fig. 9 is that session of the present invention comes into effect example three flow charts, as shown in Figure 9, four pairs of nodes upstream node and downstream node relation is each other arranged: BM-SC and aaa server, aaa server and PDG, PDG and WAG, and WAG and WLAN AN in the present embodiment.In the present embodiment, upstream node begins request message by session the session attribute is sent to downstream node, and BM-SC sends session step by step by aaa server and begin request message, specifically may further comprise the steps:

Step 901～step 902:BM-SC begins request message to the downstream node aaa server transmission session of self, indicates transfer of data on the horizon, and session attribute is provided.This session begins request message and sends to all aaa servers in " downstream node tabulation " parameter in the MBMS bearer context.First session attribute that aaa server will receive is stored in this locality, and returns session to BM-SC and begin response message.

For the broadcasting MBMS bearer service, aaa server also needs to create a MBMS bearer context, and first session attribute and the downstream node in the MBMS bearer context that storage simultaneously receives are tabulated.

In this step, first session attribute that session begins to carry in the request message can comprise: the session persistence of TMGI, QoS, MBMS service area, session identification, estimation, broadcast/group broadcast pattern, the downstream node tabulation of using for PDG and 2G/3G/WLAN indication etc.Wherein, the downstream node that uses for PDG is tabulated and is only existed when broadcast mode.

Step 903～step 904:AAA server sends session to self downstream node PDG and begins request message, and the session attribute after the renewal is provided.This message sends to all PDG in " downstream node tabulation " parameter in the MBMS bearer context in the aaa server.PDG is stored in this locality with the session attribute that receives, and returns session to aaa server and begin response message.

For the broadcasting MBMS bearer service, PDG also needs to create a MBMS bearer context, and session attribute and the downstream node in the MBMS bearer context that storage simultaneously receives are tabulated.

In this step, aaa server is as the direct downstream node of BM-SC, when the downstream node transmission session of self begins request message, need to upgrade the session attribute that receives at aaa server, be about to user ID such as IMSI, MSISDN, NAI, SIP URI, tel URI etc.; Tunnel Identifier such as IPsec SA, SPI, IKE SA, IP address, port numbers, protocol number etc. are increased in the session attribute, and are carried at session and begin to send in the request message downstream node.The session attribute that is stored in aaa server simultaneously replaces with the session attribute after the renewal.

Step 905～step 906:PDG sends the session receive to self downstream node WAG and begins request message, and session attribute is provided.This message sends to all WAG in " downstream node tabulation " parameter in the MBMS bearer context among the PDG.WAG is stored in this locality with the session attribute that receives, and returns session to PDG and begin response message.

For the broadcasting MBMS bearer service, WAG also needs to create a MBMS bearer context, and session attribute and the downstream node in the MBMS bearer context that storage simultaneously receives are tabulated.

Step 907～step 908:WAG sends the session receive to self downstream node WLAN AN and begins request message, and session attribute is provided.This message sends to all the WLAN AN in " downstream node tabulation " parameter in the MBMS bearer context among the WAG.WLAN AN is stored in this locality with the session attribute that receives, and returns session to WAG and begin response message.

Similarly, after the session of the process embodiment of the invention three begins process, all obtained session attribute in the network entity of processing MBMS business among the I-WLAN, so that the user controls session in the subsequent session process.

Above embodiment one, embodiment two and embodiment three all adopt session to begin request message, from upstream node the session attribute are sent to downstream node.

From present I-WLAN structure and concrete network configuration, in the time of may having subnetwork entity such as WLAN AN or WAG as downstream node, can't directly communicate by letter with the network entity of its upstream node, such as, WLAN AN or WAG may not directly communicate by letter with PDG; Perhaps, based on present reasons such as network configuration, be the MBMS dedicated signaling because session begins request, the session that WLAN AN or WAG possibly can't discern from aaa server begins request.Under the above-mentioned situation, for providing of MBMS business is provided, can the session attribute be sent to above-mentioned network entity by disposing, session attribute can be disposed in the following manner: 1. be deployed on the above-mentioned network entity by aaa server; 2. be deployed on the above-mentioned network entity by aaa server by PDG; 3. be deployed on the above-mentioned network entity by aaa server by BM-SC, 1., 2. and the deployment 3. can wait and realize by existing licensing process, reauthorization process; 4. by parameter modification mechanism that triggers I-WLAN self as the correcting service quality flow process of being initiated by aaa server, it is first-class that the session attribute is deployed to above-mentioned network entity.The bearing protocol of disposing the message that is adopted in the session attribute can be: the agreement of Diameter, radius protocol, http protocol, wap protocol, Session Initiation Protocol, I-WLAN special use or other custom protocol.

In addition, if subnetwork entity such as WLAN AN or WAG can not support some session attribute, for example, if WLAN AN can not provide QoS to support, then network side can not disposed qos parameter to WLAN AN, or disposes back WLAN AN and ignore these parameters.Equally, if WAG can not provide QoS to support, then network side can not disposed qos parameter to WLAN AN, or disposes back WLAN AN and ignore these parameters.

Dispose the scheme that realizes obtaining session attribute at this on the subnetwork entity, the employing below, enumerate preferred embodiment and be described in detail.

Embodiment four

Figure 10 is that session of the present invention comes into effect example four flow charts, as shown in figure 10, four pairs of nodes upstream node and downstream node relation are each other arranged: BM-SC and aaa server, aaa server and PDG, aaa server and WAG, and aaa server and WLAN AN in the present embodiment.In the present embodiment, begin request message by session between BM-SC and the aaa server, between aaa server and the PDG and send session attribute, and between aaa server and the WAG, and then by aaa server the session attribute is sent to WAG and WLAN AN between aaa server and the WLAN AN by disposing, specifically may further comprise the steps:

Step 1001～step 1002:BM-SC begins request message to the downstream node aaa server transmission session of self, indicates transfer of data on the horizon, and session attribute is provided.This session begins request message and sends to all aaa servers in " downstream node tabulation " parameter in the MBMS bearer context.First session attribute that aaa server will receive is stored in this locality, and returns session to BM-SC and begin response message.

For the broadcasting MBMS bearer service, then aaa server also needs to create a MBMS bearer context, and first session attribute and the downstream node in the MBMS bearer context that storage simultaneously receives are tabulated.

Step 1003～step 1004:AAA server sends session to self downstream node PDG and begins request message, and the session attribute after the renewal is provided.This message sends to all PDG in " downstream node tabulation " parameter in the MBMS bearer context in the aaa server.PDG is stored in this locality with the session attribute that receives, and returns session to aaa server and begin response message.

In this step, aaa server is as the direct downstream node of BM-SC, when the downstream node transmission session of self begins request message, need to upgrade the session attribute that receives at aaa server, be about to user ID such as IMSI, MSISDN, NAI, SIP URI, tel URI etc.; Tunnel Identifier such as IPsecSA, SPI, IKE SA, IP address, port numbers, protocol number etc. are increased in the session attribute, and are carried at session and begin to send in the request message downstream node.The session attribute that is stored in aaa server simultaneously replaces with the session attribute after the renewal.

Step 1005:AAA server is deployed to WAG with the session attribute.

Can be by existing licensing process, reauthorization process, policy update process etc., or the aaa server QoS modification process of initiating etc. is deployed to WAG with the session attribute, in other words, utilize QoS modification process that existing licensing process, reauthorization process, policy update process or aaa server initiate that the session attribute of needs is sent to WAG exactly.

Step 1006:AAA server is deployed to WLAN AN with the session attribute.

Equally, can be by existing licensing process, reauthorization process, policy update process etc., or the aaa server QoS modification process of initiating etc. is deployed to WLAN AN with the session attribute.

Need to prove that there are not sequencing in step 1005 and step 1006.In addition, step 1005 and step 1006 can realize obtaining of session attribute by disposing simultaneously, also can be that aaa server is according to configuration and network capabilities, only dispose session attribute, and another network entity such as WLAN AN adopt session to begin request message to transmit session attribute to one of them network entity such as WAG.

In addition, step 1001～step 1004 also can adopt the mode of step 801～step 802 to realize.

Can also adopt the mode of following embodiment five and embodiment six to realize to step 1005 among the embodiment four and step 1006:

Embodiment five

Four pairs of nodes upstream node and downstream node relation are each other arranged in the present embodiment: BM-SC and aaa server, aaa server and PDG, PDG are through aaa server and WAG, and PDG is through aaa server and WLAN AN.In the present embodiment, begin request message by session between BM-SC and the aaa server, between aaa server and the PDG and send session attribute, step 1001～step 1004 is just the same among specific implementation and the embodiment four; And PDG is between aaa server and WAG, and PDG is between aaa server and WLAN AN, then by aaa server the session attribute is sent to WAG and WLAN AN by disposing, only be with step 1005 among the embodiment four and step 1006 difference: dispose by PDG and trigger, and implement via aaa server.

Embodiment six

Four pairs of nodes upstream node and downstream node relation are each other arranged in the present embodiment; BM-SC and aaa server, aaa server and PDG, BM-SC are through aaa server and WAG, and BM-SC is through aaa server and WLAN AN.In the present embodiment, begin request message by session between BM-SC and the aaa server, between aaa server and the PDG and send session attribute, step 1001～step 1004 is just the same among specific implementation and the embodiment four; And BM-SC is between aaa server and WAG, and BM-SC is between aaa server and WLAN AN, then by aaa server the session attribute is sent to WAG and WLAN AN by disposing, only be with step 1005 among the embodiment four and step 1006 difference: dispose by BM-SC and trigger, and implement via aaa server.

Session by above-mentioned preferred embodiment begins process, and in I-WLAN, the network entity of handling the MBMS business has all obtained session attribute, so that the user controls session in the subsequent session process.

In addition and since in I-WLAN be by dedicated tunnel to the WLAN user terminal to transmit data, and to produce charge information, therefore, more rational way is to obtain just sending data to this user after the user confirms to agree to receive data.In order to make the MBMS business more perfect, the inventive method can further include: after downstream node receives that session begins request message, begin the event notice process to WLAN user terminal initiation session, to determine whether the user is ready to receive the MBMS data.The downstream node here can be a relevant network node of handling the MBMS business among the I-WLAN, such as aaa server, PDG, WAG, WLAN AN etc.; Also can be BM-SC when being ready for sending session and beginning request message, begin the event notice process to WLAN user terminal initiation session.

Embodiment seven

Figure 11 is that session of the present invention comes into effect example seven flow charts, and in the present embodiment, the step 1001～step 1006 among the specific implementation of step 1101～step 1106 and the embodiment four is in full accord, no longer repeats here.What emphasize in the present embodiment is, the PDG that receives conversation request message begins event notice with session and gives the WLAN user terminal, and specific implementation is seen step 1107 and step 1108:

Step 1107:PDG sends session to WLAN UE and begins event notice, is about to begin the MBMS transfer of data with notice WLAN UE.

Step 1108:WLAN UE returns session and begins event response, and whether PDG is follow-up to this WLAN UE transmission MBMS data according to definite decision that WLAN UE returns.

Show agreement if the session that WLAN UE returns begins event response, then PDG sends the MBMS data to this WLAN UE in subsequent process; Demonstration is disagreed with if the session that WLAN UE returns begins event response, and then PDG does not send the MBMS data to this WLAN UE in subsequent process.

Need to prove, step 1107 and step 1108 can be between step 1104 and steps 1105, also can be between step 1105 and step 1106, in a word, so long as be used for sending network entity that session begins event notice to WLANUE and receive after session begins request message current, network got final product before WLAN UE sends the MBMS data.

In addition, the inventive method can further include: be not WLAN if the session that downstream node is received begins the value of 2G/3G/WLAN indication in the session attribute that request message carries, but 2G or 3G, then this downstream node can take one of following method to handle:

1) this downstream node continues to begin request message to the downstream node transmission session of self, and upstream nodes is returned session and begun success response message.This downstream node follow-up receive the MBMS data after, continue to send the MBMS data that receive to the downstream node of self;

2) this downstream node does not continue to begin request message to the downstream node transmission session of self, and upstream nodes is returned session and begun success response message.This downstream node follow-up receive the MBMS data after, do not do any operation, directly abandon the MBMS data that receive;

3) this downstream node does not continue to begin request message to the downstream node transmission session of self, and upstream nodes is returned session and begun failure response message, and assignable cause.After upstream node is received this response, just this downstream node is deleted from " downstream node tabulation " parameter of self storing, follow-up just no longer to this downstream node transmission MBMS data.

The downstream node here can be a relevant network node of handling the MBMS business among the I-WLAN, such as aaa server, PDG, WAG, WLAN AN etc., also can be BM-SC self.

Need to prove, in above the inventive method, be under the roaming working method, if relate to aaa server on stream at the WALN user terminal, shown in Fig. 5 a and Fig. 5 b, the message signaling message that session begins in the process also needs to be transmitted to aaa server by the AAA agency.Aaa server also can be stored relevant session attribute, sets up the MBMS bearer context.

The above is preferred embodiment of the present invention only, is not to be used to limit protection scope of the present invention.

Claims

1. method that realizes that session begins among the multimedia broadcast/group broadcast service MBMS, it is characterized in that, this method is: in intercommunicated wireless local area network I-WLAN, the upstream node of handling the MBMS business to self each other the downstream node of upstream and downstream node relationships send session attribute, downstream node receives and the store session attribute.

2. method according to claim 1 is characterized in that, after described downstream node received session attribute, this method also comprised: described downstream node to self each other the upstream node of upstream and downstream relation return response.

3. method according to claim 1 is characterized in that, the method for described transmission session attribute is:

4. method according to claim 1, it is characterized in that, the method of described transmission session attribute is: upstream node is carried at the session that session begins process with the session attribute and begins to send in the request message downstream node, and the bearing protocol that then described session begins the message in the process is: Diameter, radius protocol, http protocol, wap protocol, Session Initiation Protocol or custom protocol.

5. method according to claim 1, it is characterized in that, the method of described transmission session attribute is: upstream node is carried at session that session begins process with the session attribute to begin to send in the request message portion downstream node and combines at residue downstream node deploy session attribute, and the method for then described deployment session attribute is:

6. method according to claim 5, it is characterized in that the bearing protocol of the message that is adopted in the described deployment session attribute is: the agreement or the custom protocol of Diameter, radius protocol, http protocol, wap protocol, Session Initiation Protocol, I-WLAN special use.

7. method according to claim 1 is characterized in that, the upstream node and the downstream node of the described node relationships of upstream and downstream each other are:

8. method according to claim 3, it is characterized in that, after arbitrary downstream node in the described downstream node receives that described session begins request message, this method also comprises: this downstream node sends session to the WLAN user terminal and begins event notice, and begins event response according to the session that the WLAN user terminal returns and determine whether to send the MBMS data to this WLAN user terminal;

9. method according to claim 1 is characterized in that, the upstream node of the described node relationships of upstream and downstream each other and downstream node are BM-SC and aaa server, aaa server and PDG, aaa server and WAG, and aaa server and WLAN AN; And set up the IPsec tunnel between WLAN user terminal and PDG, this method specific implementation may further comprise the steps:

10. method according to claim 9 is characterized in that, described aaa server is all aaa servers in the downstream node list parameter in the MBMS bearer context of storing among the BM-SC.

11. method according to claim 9, it is characterized in that, in steps A 1, receive after session begins request message at described aaa server, this method also comprises: if current MBMS business is the broadcasting MBMS bearer service, then described aaa server is created a MBMS bearer context, and the tabulation of the downstream node in the store M BMS bearer context;

12. method according to claim 11 is characterized in that,

13. method according to claim 1 is characterized in that, the upstream node of the described node relationships of upstream and downstream each other and downstream node be BM-SC and PDG, PDG through aaa server and WAG, and PDG is through aaa server and WLAN AN; Set up the IPsec tunnel between WLAN user terminal and PDG, this method specific implementation may further comprise the steps:

14. method according to claim 13 is characterized in that, described PDG is all PDG in the downstream node list parameter in the MBMS bearer context of storing among the BM-SC;

15. method according to claim 1 is characterized in that, the upstream node of the described node relationships of upstream and downstream each other and downstream node are BM-SC and aaa server, aaa server and PDG, PDG and WAG, and WAG and WLAN AN; And set up the IPsec tunnel between WLAN user terminal and PDG, this method specific implementation may further comprise the steps:

16. method according to claim 15 is characterized in that, described aaa server is all aaa servers in the downstream node list parameter in the MBMS bearer context of storing among the BM-SC.

17. method according to claim 15, it is characterized in that, in steps A 3, receive after session begins request message at described aaa server, this method also comprises: if current MBMS business is the broadcasting MBMS bearer service, then described aaa server is created a MBMS bearer context, and the tabulation of the downstream node in the store M BMS bearer context;

18. method according to claim 17 is characterized in that, described PDG is all PDG in the downstream node list parameter in the MBMS bearer context of storing in the aaa server;

19. method according to claim 1 is characterized in that, the upstream node of the described node relationships of upstream and downstream each other and downstream node are BM-SC and aaa server, aaa server and PDG, aaa server and WAG, and aaa server and WLAN AN; And set up the IPsec tunnel between WLAN user terminal and PDG, this method specific implementation may further comprise the steps:

20. method according to claim 19 is characterized in that, described aaa server is all aaa servers in the downstream node list parameter in the MBMS bearer context of storing among the BM-SC.

21. method according to claim 19, it is characterized in that, in steps A 4, receive after session begins request message at described aaa server, this method also comprises: if current MBMS business is the broadcasting MBMS bearer service, then described aaa server is created a MBMS bearer context.

22. method according to claim 1 is characterized in that, the upstream node of the described node relationships of upstream and downstream each other and downstream node are BM-SC and aaa server, aaa server and PDG, aaa server and WAG, and aaa server and WLAN AN; And set up the IPsec tunnel between WLAN user terminal and PDG, this method specific implementation may further comprise the steps:

23. method according to claim 1 is characterized in that, the upstream node of the described node relationships of upstream and downstream each other and downstream node be BM-SC and PDG, PDG through aaa server and WAG, and PDGAAA server and WLAN AN; And set up ipsec tunnel between WLAN user terminal and PDG, this method specific implementation may further comprise the steps:

B6.PDG upgrades first session attribute that receives and replaces;

24. method according to claim 1 is characterized in that, the upstream node of the described node relationships of upstream and downstream each other and downstream node be BM-SC and PDG, PDG through aaa server and WAG, and PDGAAA server and WLAN AN; And set up the IPsec tunnel between WLAN user terminal and PDG, this method specific implementation may further comprise the steps:

B7.PDG upgrades first session attribute that receives and replaces;

Session attribute after C7.PDG or BM-SC will upgrade respectively via aaa server is deployed to WAG and WLAN AN by the QoS modification process that has licensing process, reauthorization process, policy update process or initiated by aaa server.

25. according to claim 19 or 22 described methods, it is characterized in that, this method also comprises: described PDG sends session to the WLAN user terminal and begins event notice, and begins event response according to the session that the WLAN user terminal returns and determine whether to send the MBMS data to this WLAN user terminal.

26., it is characterized in that the method for described renewal first session attribute is according to claim 9,13,15,19,22,23 or 24 described methods: the user ID that will store and Tunnel Identifier are increased in described first session attribute.

27. method according to claim 26 is characterized in that, described user ID comprises: IMSI, MSISDN, NAI, SIP URI and tel URI; Described Tunnel Identifier comprises: IPsec SA, SPI, IKESA, IP address, port numbers and protocol number.

28. method according to claim 26, it is characterized in that described first session attribute comprises: the session persistence of interim horde group id TMGI, service quality QoS, MBMS service area, session identification, estimation, broadcast/group broadcast pattern, 2G/3G/WLAN indication and/or the downstream node tabulation of using for PDG.

29., it is characterized in that if the WLAN user terminal is in the roaming working method, the then described information that sends to aaa server is transmitted by the AAA agency according to claim 9,15,19,22,23 or 24 described methods.

30. method according to claim 1 is characterized in that, the value of 2G/3G/WLAN indication is not WLAN in the session attribute that described downstream node is received, then this method also comprises: