CN101150852B

CN101150852B - Method for terminal to exit from multicast and broadcast service and multicast and broadcast system

Info

Publication number: CN101150852B
Application number: CN2007100048477A
Authority: CN
Inventors: 张伟; 梁文亮
Original assignee: Huawei Technologies Co Ltd
Current assignee: Huawei Technologies Co Ltd
Priority date: 2006-09-20
Filing date: 2007-02-02
Publication date: 2012-02-22
Anticipated expiration: 2027-02-02
Also published as: CN101150852A

Abstract

The invention relates to the radio communication field, discloses a method of exiting multi-broadcasting services of a mobile terminal and a multi-broadcasting service to make a mobile terminal in a WiMAX network exit the MBS service normally. In the invention, a MBS server receives a request of exiting the MBS or ends the condition of providing services to the terminal, modifies context of the terminal, stops MBS service charge and notifies a network side key management body to stop updating the key of the terminal. If the terminal is activated, after the MBS server affirms the terminal exiting the MBS service, the MBS server or an anchor gateway notifies the serving gateway to exit the information, the serving gateway notifies the base station of the terminal to modify corresponding user counting of MBS, triggers a flow for bearing adjustment when the user counting satifies the predetermined condition. If the base station bears the MBS service through a PTP mode, after the terminal exits the MBS service, releases the gap resource corresponding to the MBS of the terminal.

Description

The method of terminal to exit from multicast broadcasting service and multicast and broadcast system

Technical field

The present invention relates to wireless communication field, particularly the multicast and broadcast technology.

Background technology

Along with the growth of development of Communication Technique and user's request, data service has obtained developing rapidly, and increasing rapidly of data business volume makes people surging to the increasing demand of communication bandwidth, and broadband access shows a huge market to industrial circle.For breaking through the bandwidth bottleneck of Access Network, people have released multiple broadband access technology.

IEEE802.16 is (the Institute of Electrical andElectronics Engineers of Institute of Electrical and Electronics Engineers; Be called for short " IEEE ") in promulgation in December calendar year 2001, be used for the standard that provides last kilometer WiMAX to insert at metropolitan area network.The IEEE802.16 standard mainly comprises 802.16a, 802.16RevD and three standards of 802.16e.

Micro-wave access to global intercommunication (Worldwide Interoperability for Microwave Access; Be called for short " WiMAX ") be that present industry is to the wireless MAN access technology based on IEEE 802.16 series standards; Its elementary object provides a kind of under some multivendor environment to multiple spot of metropolitan area network, effectively the broadband wireless access means of interoperability.

Specifically, 802.16 series standards have been stipulated the air interface part protocol layer of WiMAX system, mainly comprise physical layer (PHY), and medium access control (Medium Access Control is called for short " MAC ") layer.Wherein, the PHY layer is physically accomplished operations such as the modulation of signal and encoding and decoding, and the MAC layer is mainly accomplished the medium access control function of WiMAX system.

Fig. 1 illustrates the end-to-end reference model of WiMAX.Wherein the R1 interface is a wireless air interface, is mainly defined by IEEE802.16d/e.All the other interfaces are wireline interface.

As scheme visible; WiMAX mainly comprises travelling carriage (Mobile Station; Be called for short " MS ")/subscriber station (Subscribe Station; Abbreviation " SS "), access service network (Access ServiceNetwork is called for short " ASN ") and connectivity serving network (Connectivity Service Network is called for short " CSN ").

ASN is defined as the network function set that the wireless access service is provided for the WiMAX user terminal, and ASN has comprised BS and ASN gateway (ASN GateWay is called for short " ASN-GW ") network element, and an ASN possibly shared by a plurality of CSN.

The major function of ASN comprises the function of BS and the function of ASN-GW.Wherein, the function of BS has: provide that BS is connected with the L2 of subscriber station SS/MS, the compression and the encryption of RRM, measurement and the power control and the data of eating dishes without rice or wine.The function of ASN-GW has: for SS/MS authentication function provides agency (proxy) function; Support the network of NSP to find and selection; For SS provides relaying (Relay) function of L3 information, like IP address assignment.

CSN is defined as to the WiMAX user terminal IP is provided Connection Service.CSN mainly provides the IP address assignment of following function: SS/MS; Internet inserts, checking, mandate, charging protocol (Authentication, Authorization, Account are called for short " AAA ") agency (proxy) or service (server); Authorization control based on the user; ASN is to the tunnel of CSN, WiMAX user's charging and the clearing between the operator, the tunnel under the roaming condition between the CSN; Switching between the ASN and various WiMAX service (like location-based business, multi-medium multi-packet broadcasting and broadcasting service, IP Multimedia System business).

MS/SS is (moving) terminal, and the user uses this terminal to insert the WiMAX network.

More than WiMAX and network architecture thereof are illustrated, down carry out brief account in the face of Multimedia Broadcast Multicast Service (Multicast&Broadcast Service is called for short " MBS ").

Fast development along with Internet (internet); People no longer are satisfied with phone and messaging service to the demand of mobile communication; A large amount of multimedia services emerge; The some of them applied business requires a plurality of users can receive identical data simultaneously, like video request program, television broadcasting, video conference, online education, interactive game etc.On cable network, can adopt internetworking agreement (Internet Protocol at present; Abbreviation " IP ") multicast and broadcast technology realize; But these business are transplanted on the mobile network, are compared, characteristics such as data volume is big because these business have, longer duration, delay sensitive with general data; And mobile network has particular network structure, functional entity and wave point etc., and existing IP multicast and broadcast technology can not be directly applied for mobile network.

In order to effectively utilize mobile network resource; It is professional that WiMAX has defined MBS, and the MBS business is in the mobile network, to provide a data source to send the point-to-multipoint service of data to a plurality of users, realizes that Internet resources are shared; Improve utilization rate of network resource, the interface resource of especially eating dishes without rice or wine.The MBS of WiMAX definition can not only realize the classes of messages multicast and the broadcasting of plain text low rate, and can also realize multicast and broadcasting that high-speed multimedia is professional, and this has complied with following mobile data Development Trend undoubtedly.

In the WiMAX network, through service flow sign (Service Flow Identifier is called for short " SFID "); Identify different one directional service stream; Identify different connections through CID, all service flow transmit in the connection of eating dishes without rice or wine through media interviews control (Medium Access Control is called for short " MAC ") layer; Through shining upon, service flow is transmitted in the connection of correspondence between the SFID of service flow and the CID that the MAC layer is connected.Based on WiMAX network MBS business on the basis of above-mentioned sign; Also identifying multicast specially through multicast connection identifier (Multicast CID) connects; Identify a multicast service through multicast content sign (MBS Contents ID); A MulicastCID goes up the protocol Data Unit (Protocol Data Unit is called for short " PDU ") that transmits and can comprise one or more MBS business.

In the MBS business; The service flow of some whole world definition can be carried to the broadcasting or the multicast information at a plurality of terminals; These service flow comprise service quality (Quality of Service; Be called for short " QoS ") parameter, in order to improve service security property, can encrypt it with the data encryption key of whole world definition.

Two kinds of access modules of MBS business support based on the WiMAX network: single base station is inserted and many base stations are inserted.Under the access module of many base stations; All base stations in the MBS territory (be MBS Zone, identify with MBS zone ID) are with identical Multicast CID and MBS group Security Association (MBS Group Security Association is called for short " MBS GSA "); Send the content of same MBS service flow; The terminal of having registered the MBS service can be through a plurality of base stations reception MBS business datums in this MBS territory, and the terminal that is in Idle state need not rebuild connection when moving in interior span base station, MBS district; Can be impregnable reception MBS professional, realize the seamless switching that MBS is professional.

In the prior art, according to the description of agreement 802.16e-2005, can set up MBS through " DSA-REQ "/" DSA-RSP " and connect link and tell the terminal MBS content identification that the MBS territory is broadcast to receive the MBS business datum with indicating terminal.Also stipulated the terminal in addition when mobile, how to have realized the seamless switching that MBS is professional, as professional for the MBS under the access module of many base stations; The terminal is except receiving the MBS business datum through a plurality of base stations in this MBS territory; For the terminal that is under the Idle state, in the MBS territory, stride the base station when moving, need not network re-entry and rebuild that MBS is professional to be connected; Can be impregnable reception MBS professional, realize the seamless switching that MBS is professional.

Yet do not relate to the relevant treatment that to carry out when leaving the MBS business in the 802.16e-2005 agreement.

Summary of the invention

In view of this, main purpose of the present invention is to provide a kind of method and multicast and broadcast system of terminal to exit from multicast broadcasting service, makes that the MBS business can be normally withdrawed from the terminal in the WiMAX network.

For realizing above-mentioned purpose, the invention provides the method for terminal to exit from multicast broadcasting service in a kind of microwave access global intercommunication network, comprise following steps:

After Multimedia Broadcast Multicast Service MBS server received that the terminal is withdrawed from the request of MBS or terminated as the terminal condition that service is provided and satisfies, network side key management entity stopped to carry out for this terminal the key updating of MBS.

The present invention also provides a kind of multicast and broadcast system; Comprise at least one and be used to provide the MBS MBS server of service; And the bearer network that connects MBS server and terminal; Said MBS server also is used for after receiving that the terminal is withdrawed from the request of MBS or terminated as the terminal condition that service is provided and satisfies, and indication network side key management entity stops to carry out for this terminal the key updating of MBS.

Through relatively finding; The main distinction of technical scheme of the present invention and prior art is; The MBS server with the context of revising the terminal and/or the professional context of relevant MBS, stops the MBS service billing after receiving that the terminal is withdrawed from the request of MBS or terminated as the terminal condition that service is provided and satisfies; And network side key management entity stops to carry out key updating for this terminal; Make the terminal in the active initiation request or passively stop to receive MBS when professional, all can normally withdraw from the MBS business, stop the professional charging of this MBS.

Description of drawings

End-to-end reference model in the WiMAX network in prior art during Fig. 1;

Fig. 2 is the method flow diagram that withdraws from MBS according to terminal in the WiMAX network of first embodiment of the invention;

Fig. 3 is the method flow diagram that withdraws from MBS according to terminal in the WiMAX network of second embodiment of the invention;

Fig. 4 is the method flow diagram that withdraws from MBS according to terminal in the WiMAX network of third embodiment of the invention;

Fig. 5 is the method flow diagram that withdraws from MBS according to terminal in the WiMAX network of four embodiment of the invention;

Fig. 6 is the method flow diagram that withdraws from MBS according to terminal in the WiMAX network of fifth embodiment of the invention;

Fig. 7 is the method flow diagram that withdraws from MBS according to terminal in the WiMAX network of sixth embodiment of the invention.

Embodiment

For making the object of the invention, technical scheme and advantage clearer, will combine accompanying drawing that the present invention is done to describe in detail further below.

After the MBS server receives that the terminal is withdrawed from the request of MBS or terminated as the terminal condition that service is provided and satisfies; With the context of revising the terminal; Stop the MBS service billing and stop to carry out key updating for this terminal; Make the terminal in the active initiation request or passively stop to receive MBS when professional, all can normally withdraw from the MBS business, stop the professional charging of this MBS.

The MBS business is withdrawed from the terminal, and following several kinds of possibilities are arranged:

1. MBS is initiatively withdrawed from the terminal: possibly withdraw from flow process thereby cause because under the activated state, the user no longer hopes to receive this MBS, this withdraws from flow process and can initiatively be initiated by the terminal under the activated state; Also possibly move out the MBS territory of original reception business owing to the terminal, thereby trigger terminal withdraws from this MBS, at this moment, this withdraws from flow process and can be initiated by the network side proxy terminal; Also possibly be that the MBS flow process was initiated to withdraw from the terminal under the activated state before shutdown; Or the like.

2.MBS the server requirement user withdraws from MBS: Sorry, your ticket has not enough value owing to the prepaid user for possibility; Or the like.

3. the network equipment (like anchor point PC) proxy terminal initiates to withdraw from the MBS business: maybe be owing to the Idle state terminal closedown, and anchor point PC agency initiates service deactivation to the MBS server in this terminal; Or because the terminal is striden the MBS territory and moved, as prioritization scheme, base station/gateway can be initiated service deactivation to the MBS server by proxy terminal; Or because terminal abnormal moves back net, service deactivation is initiated to the MBS server in anchor gateway/this terminal of anchor point PC agency; Or the like.

According to inventive principle first embodiment of the invention is described below.First embodiment of the invention relates to the method that MBS is withdrawed from terminal in the WiMAX network, and is specifically as shown in Figure 2.Terminal in this execution mode is the terminal of activated state, is that the terminal provides corresponding M BS by the gateway at terminal.

When the terminal hopes to withdraw from MBS; Get in the step 201; The terminal is sent the request of leaving MBS through Internet Group Management Protocol (Internet Group Management Protocol is called for short " IGMP ") to anchor gateway, wherein indicates the multi-broadcast group address of the MBS that will withdraw from.

Then get into step 202; If handle this message by anchor gateway; After then anchor gateway is received this request, the IGMP data of this request of transmission are transferred to chain of command handle, the multi-broadcast group map addresses that chain of command will wherein comprise is to concrete MBS; And will to withdraw from certain MBS professional at this terminal of gateway of notifying place, this terminal, and the message content of being notified comprises: contents such as Termination ID, terminal NAI, service ID, content identification, ip multicast address.Also can complete IGMP message be encapsulated in the above-mentioned message and send to gateway.

In step 203; Receive the message of step 202 transmission at gateway after; If perhaps by the message in the gateway treatment step 201; In this message of gateway data surface identification, and after transferring to the chain of command processing, gateway is initiated the MBS business to the MBS of correspondence server and is withdrawed from request; The MBS business is withdrawed from the request wherein indicated, message content also comprises: Termination ID (MSID), terminal NAI (MS NAI), traffic ID (Service ID), content identification (Content ID), ip multicast address, leave sign contents such as (Leave Indicator).Also can complete IGMP message be encapsulated in and send to the MBS server in the above-mentioned message.Make the MBS server can withdraw from the terminal and corresponding MBS of MBS according to the unique definite needs of this message.

Then get into step 204; After the MBS server is received this request; Legitimacy to message content confirms, confirm legal after, the response message that returns success to gateway; And can revise the context and the business contexts at terminal simultaneously, and stop the MBS charging at this terminal and the key updating that informing network side key management entity stops this terminal is carried out MBS.Revising the terminal context promptly refers to this MBS service related information is deleted from the context of terminal; Revising business contexts promptly refers to this terminal related information is deleted from business contexts; The implication of hereinafter said modification terminal context, modification business contexts is all identical with here, will repeat no more afterwards.

Then get into step 205; After gateway is received this response of successful message; Use the R6 interface message; Send corresponding M BS like RR REQ (resource reservation request) message to the base station at this terminal and withdraw from message, message content comprises MSID, the professional corresponding service flow of this MBS identifies and withdraw from information such as professional indication.

Then get into step 206; After this message is received in this base station; Use the R1 interface message, accomplish like DSD REQ (dynamic service deletion request) message informing counterpart terminal and withdraw from the MBS flow process, message content comprises MSID, the professional corresponding service flow of this MBS identifies and withdraw from information such as professional indication.

Then get into step 207, after this message is received at the terminal, return corresponding message to the base station, like DSDRSP message.If it is professional that this MBS is carried through ptp mode in this base station, then in the DSD process, discharge the corresponding interface-free resources of this terminal MBS, avoid interface-free resources by vacant, cause the wasting of resources; If this base station is professional through this MBS of PTM mode carrying, then the DSD process only plays announcement, discharges its resource voluntarily by the terminal.

Then get into step 208, the base station is then returned to withdraw from accordingly to gateway and is replied, and notification service gateway terminal side has completed successfully withdrawing from of MBS.

Then get into step 209, after gateway is received message, send the MBS exit confirmation to the MBS server then.

Then get into step 210; After the MBS server is received this acknowledge message; Return success to gateway and to reply ACK; Show and know that this terminal successfully withdraws from MBS, and then revise the context and the business contexts at terminal, and the MBS that stops this terminal charges and informing network side key management entity stops this terminal is carried out the key updating of MBS.Through stopping key for this terminal updating MBS business, make when the MBS business cipher key changes that the terminal can't continue to use this MBS professional, guarantee that through this method the terminal is stopping this MBS of back termination use that charges.

Because before the MBS server stops the MBS at this terminal, passed through multiple Signalling exchange, thereby guaranteed that the terminal withdraws from the fail safe of MBS.

Then get into step 211, gateway returns to the base station and withdraws from ACK accordingly, and informing base station MBS server formally stops this terminal and uses MBS and stopped corresponding charging.

Step 209 to step 211 is an optional step, if in step 204, carried out context revision, charging and key associative operation, then step 209 to step 211 can be carried out.

Then get into step 212, gateway is after handling the flow process that the user withdraws from MBS, and the notice anchor gateway is revised this user's context, with the MBS service related information deletion of having withdrawed from.

The base station then gets into step 213 after mutual completion of eating dishes without rice or wine, terminal context and this MBS business contexts are revised in the base station, and revises the professional user number counting of this MBS simultaneously, and user number counting is reduced 1.If this MBS is less than first thresholding with PTM mode carrying and amended user number counting; Then trigger the precise statistics of this MBS number of users; If the number of users of precise statistics satisfies the condition of carrying this MBS through point-to-point mode, then the bearing mode with this MBS is a ptp mode from the PTM mode switch; If amended user number counting is 0; Then trigger the precise statistics of this MBS number of users equally; If the number of users that counts still is 0, then get into step 214, register flow path is initiated to go to gateway in the base station; The notification service gateway is again to this this MBS business datum of base station distribution, also can remove the carrying that this MBS is corresponding between this base station and the gateway simultaneously and discharge the corresponding interface-free resources of this MBS (comprising interface-free resources or the interface-free resources under the PTM pattern under the ptp mode).In this step, the user number counting of MBS has identified the terminal number under the activated state of using this MBS, and this number can be participated in and the flow process that withdraws from this MBS changes according to the terminal; Because except the activated state terminal; Also possibly exist the terminal of Idle state to use this MBS, and Idle state use the terminal number of this MBS clearly to identify through user number counting down, is at user number counting therefore at 0 o'clock; Also need carry out the precise statistics of MBS service-user number; When confirming to have no the terminal to use this MBS professional, just discharge corresponding the carrying, under any state, all can normally use MBS to guarantee the terminal.In addition; In step 213, if this moment, this MBS service conversation did not begin as yet, the number of users of this MBS also can temporarily only be revised in the base station;, this MBS selects to trigger the flow process of number of users statistics when beginning again according to current number of users, to reduce the possibility that idle work is made in the base station.

If after this base station notification service gateway no longer needs its distributing data; It is professional to have no the base station to continue to receive this MBS on this gateway; Then this moment, this gateway also need not to receive this MBS business again, then got into step 215, and this gateway initiates to go register flow path to the MBS server; Notify its MBS server not again to this this MBS business datum of gateway distribution; Also releasing bearing simultaneously, the mode of releasing bearing can be the multi-broadcast group of removing the corresponding tunnel of this MBS or leaving this MBS, thereby supplies other business that need to use available resources.

In this execution mode, if what this MBS is provided for this terminal is the anchor gateway at terminal, the signaling transmission and the operation that then replace gateway to be correlated with by anchor gateway.

Second embodiment of the invention is roughly the same, relates to the method that MBS is withdrawed from terminal in the WiMAX network equally, and is specifically as shown in Figure 3.Terminal in this execution mode also is the terminal of activated state, is that the terminal provides corresponding M BS by the gateway at terminal.

When hoping to withdraw from the MBS business at the terminal; Get into step 301; The R1 interface message is used at the terminal, will withdraw from the MBS business like this terminal, DSD REQ message informing base station, and the Multicast CID, Traffic CID that carry the MBS that hopes to withdraw from the message are or/and traffic ID.

Then get into step 302, after DSD REQ is received in the base station, use the R6 interface message, withdraw from MBS like this terminal request of RR REQ message informing gateway, the Multicast CID, Traffic CID that carry the MBS that hopes to withdraw from the message equally are or/and traffic ID.

Then get into step 303; After gateway is received request; Initiate the MBS business to the MBS server and withdraw from request; The MBS business is withdrawed from the request wherein indicated, message content also comprises: Termination ID (MSID), terminal NAI (MS NAI), traffic ID (Service ID), content identification (Content ID), ip multicast address, leave sign contents such as (Leave Indicator).Make the MBS server can withdraw from the terminal and corresponding MBS of MBS according to the unique definite needs of this message.

Then get into step 304; After the MBS server receives that the request of MBS is withdrawed from this terminal; Legitimacy to message content confirms, confirm legal after, the response message that returns success to gateway; And can revise the context and the MBS business contexts at terminal simultaneously, and stop the MBS charging at this terminal and the key updating that informing network side key management entity stops this terminal is carried out MBS.

Then get into step 305; After gateway is received this response of successful message; Use corresponding R6 interface message, send MBS like RR RSP message to the base station at this terminal and withdraw from message, message content comprises MSID, the professional corresponding service flow of this MBS identifies and withdraw from information such as professional indication.

Then get into step 306; After this response message is received in this base station; Use corresponding R1 interface message, accomplish like DSD RSP message informing counterpart terminal and withdraw from the MBS flow process, message content comprises MSID, the professional corresponding service flow of this MBS identifies and withdraw from information such as professional indication.

Then get into step 307, after this message is successfully received at the terminal, can optionally return to withdraw to the base station and reply, this terminal of informing base station have confirmed to withdraw from MBS.If it is professional that this MBS is carried through ptp mode in this base station, then the base station can discharge the corresponding interface-free resources of this terminal MBS, avoids interface-free resources by vacant, causes the wasting of resources.Then get into step 308.

Step 308 to step 315 is similar with step 208 to step 215, repeats no more at this.

Third embodiment of the invention relates to the method that MBS is withdrawed from terminal in the WiMAX network, and is specifically as shown in Figure 4.Terminal in this execution mode is the terminal of Idle state, and in this execution mode, professional the withdrawing from of MBS can be realized through existing Location Update (position renewal) flow process in the terminal of Idle state.

When the Idle state terminal hopes to withdraw from MBS, get into step 401, MBS will be withdrawed from informing base station this terminal in terminal, specifically can notify through " Rng_Req " message of expansion.Action Code is Location Update in " Rng_Req " message; The terminal adds contents such as MBS service identification and Multicast CID, SFID, Content ID in " Rng_Req " message, can in message, add the sign that withdraws from MBS simultaneously.

Then get into step 402; After this message is received in the base station, according to normal Location Update flow process, through request message; Like " Location Update Req " message informing anchor point PC, can directly notify anchor point PC or notify anchor point PC indirectly through relay PC.Wherein, the contents such as service identification, Multicast CID, SFID, Content ID that comprise the sign that withdraws from MBS and this MBS in should " Location Update Req " message.

Then get into step 403; After anchor point PC receives " the Location Update Req " message of sending the base station; According to existing Location Update flow process message is handled; If comprise the sign that withdraws from MBS in the discovery message, then anchor point PC initiates to withdraw from the request of MBS service authorization to this MBS corresponding server, in message, comprises MSID, NAI and corresponding MBS sign.

Then get into step 404, the MBS server is authorized after receiving this request accordingly, the MBS server confirm to authorize pass through after, the response message that returns success to anchor point PC.The context and the MBS business contexts at terminal be can also revise simultaneously, and the MBS charging at this terminal and the key updating that informing network side key management entity stops this terminal is carried out MBS stopped.

Then get into step 405, anchor point PC returns response message according to existing Location Update flow process to base station side, and like " Location Update Response ", this message can directly be returned the base station equally or return the base station indirectly through relay PC.Comprise the MBS sign in the message and this professional affirmation sign is withdrawed from the terminal.

Then get into step 406; After this " Location Update Response " message is received in the base station; After the legitimacy of " Rng_Req " message that verification terminal sends; Through " Rng_Rsp " message informing this terminal Location Update success of correspondence, show that simultaneously corresponding MBS withdraws from.In this " Rng_Rsp " message, need comprise MBS sign and result's sign.

Then get into step 407, after this message is successfully received at the terminal, can optionally return corresponding response message to the base station.

Then get into step 408; After this message is received in the base station; Return " Location Update Confirm " message according to Location Update flow process to anchor point PC; Comprise the terminal in the message and withdraw from the sign of MBS and corresponding MBS sign, notice anchor point PC confirms successfully withdrawing from MBS at the terminal.

Then get into step 409, after anchor point PC successfully receives " Location Update Confirm " message, carry out alternately with the MBS server, send exit confirmation to the MBS server, the MBS business of appointment is withdrawed from this terminal of notice MBS server fully

Then get into step 410, after the MBS server is received this acknowledge message, revise the terminal context and/or revise this MBS business contexts, and stop the MBS charging at this terminal, indication network side key management entity stops this terminal is carried out the key updating of MBS.Return to anchor point PC afterwards and withdraw from ACK.Through stopping key for this terminal updating MBS business, make when the MBS business cipher key changes that the terminal can't continue to use this MBS professional, guarantee that through this method the terminal is stopping this MBS of back termination use that charges.

Then get into step 411, anchor point PC returns to the base station and withdraws from ACK accordingly, and informing base station MBS server formally stops this terminal and uses MBS and stopped corresponding charging.

Step 409 to step 411 is an optional step, if in step 404, carried out context revision, charging and key associative operation, then step 409 to step 411 can be carried out.

Need to prove, after anchor point PC receives that affirmation (Location Update Confirm) message is upgraded in the position of returning the base station, also should notify anchor gateway to revise the terminal contextual information of its preservation.

Four embodiment of the invention relates to the method that MBS is withdrawed from terminal in the WiMAX network.In this execution mode, the terminal is not initiatively to withdraw from MBS, but when the condition that terminates as the terminal and provide service was satisfied, the MBS that is stopped this terminal by the MBS server was professional, specifically as shown in Figure 5.

When the condition that terminates as the terminal and provide service is satisfied, get into step 501, the MBS server is to the gateway (gateway or anchor gateway) that carries MBS for this terminal, and transmission MBS business withdraws from indication.Comprise in the Indication message: the terminal and corresponding MBS of MBS withdrawed from MSID, NAI, MBS service identification, MBS content identification etc., unique definite needs.The MBS server can be revised the context and the MBS business contexts at terminal simultaneously in this step, and the MBS that stops this terminal charges and stop this terminal is carried out the key updating of MBS through network side key management entity.

Then get into step 502, after gateway or anchor gateway are received this message, this message is confirmed according to the user profile of preserving before.And return response message.

Then get into step 503, the MBS server if the MBS server does not carry out related context modification and key, charging associative operation in step 501, then can carry out corresponding operating at this moment after receiving response message.Because network side key management entity stops to be this terminal updating key, and the MBS key updating is still normally carried out, thereby this MBS can't be continued to use in the terminal.In order to force the terminal to stop using this MBS immediately, the MBS server can be initiated the flow process of a MBS business cipher key renewal after confirming no longer for this terminal this MBS to be provided, and makes the terminal to continue to use this MBS through original key.

Step 502,503 here is optional, if do not take place at this moment, can wait until step 508, take place in 509 o'clock.

Then get into step 504, gateway or anchor gateway are used the R6 interface message, and it is professional to have re-used this MBS like this terminal, base station at this terminal of RR REQ message informing.Message content comprises MSID, the professional corresponding service flow of this MBS identifies and withdraw from information such as professional indication.

Then get into step 505, after this notice is received in the base station, use the R1 interface message, withdraw from MBS like DSD REQ message informing counterpart terminal, message content comprises MSID, the professional corresponding service flow of this MBS identifies and withdraw from information such as professional indication.

Then get into step 506, after this message is received at the terminal, return corresponding response message, like DSD REP message to the base station.If it is professional that this MBS is carried through ptp mode in this base station, then in the DSD process, discharge the interface-free resources of this terminal MBS, avoid interface-free resources by vacant, cause the wasting of resources; If this base station is professional through this MBS of PTM mode carrying, then the DSD process only plays announcement, discharges its resource voluntarily by the terminal.Then get into step 507.

Step 508,509 is an optional step, if step 502,503 executeds, then this two step needn't carry out; If step 502,503 is not carried out, then need carry out here, it carries out content and 502,503 consistent.

Step 510 to step 513 is similar with step 208 to step 214; Wherein, Step 510 to step 511 is optional, and promptly gateway or anchor gateway can be sent the MBS exit confirmation to the MBS server, after the ACK that receives the MBS server replys; The notice anchor ASN-GW is revised the terminal context, returns to the base station and withdraws from ACK accordingly; Or gateway or anchor gateway receive reply from withdrawing from of base station after, the notice anchor ASN-GW is revised the terminal context, with this MBS information deletion.

Fifth embodiment of the invention relates to the method that MBS is withdrawed from terminal in the WiMAX network.Terminal in this execution mode is the terminal of Idle state, and when terminal exiting network (initiatively move back net, passive move back net or accident is moved back net), anchor point PC replaces the Idle state terminal to initiate to withdraw from the MBS business as the agency, and is specifically as shown in Figure 6.

In step 601, anchor point PC finds the Idle state terminal exiting network.The Idle state terminal exiting network can shut down under idle pulley for the terminal, through moving back the position updating process (Power Down Location Update) that network mark is known having of a success; Perhaps one of network side aaa server, external agent, anchor point PC or its combination in any trigger this Idle state terminal exiting network; Perhaps anchor point PC finds that this Idle state terminal abnormal falls net.

Then get into step 602, anchor point PC according to the MBS business information at this terminal of being preserved, sends the MBS business to relevant MBS server and withdraws from request after finding this Idle state terminal exiting network, and the MBS business is withdrawed from request.

Then get into step 603, after the MBS server is received this request, revise the context and/or the professional context of this MBS at this terminal, and stop the MBS charging at this terminal, informing network side key management entity stops this terminal is carried out the key updating of MBS.Thereby make the terminal when shutting down, also can normally withdraw from the MBS business, stop the charging of this business because of accident.

Sixth embodiment of the invention relates to the method that MBS is withdrawed from terminal in the WiMAX network.Terminal in this execution mode is the terminal of activated state terminal or Idle state, and when terminal exiting network (initiatively move back net, passive move back net or accident is moved back net), anchor gateway replaces this terminal to initiate to withdraw from the MBS business as the agency, and is specifically as shown in Figure 7.

In step 701, anchor gateway is found terminal exiting network.For the activated state terminal, no matter initiatively move back net, passively move back net or accident is moved back net, anchor ASN-GW can receive from gateway or serving BS be used to indicate the user to move back the message of net, this message can be removed registration message for data channel; For the Idle state terminal, no matter initiatively move back net, passively move back net or accident is moved back net, anchor point PC handle move back the net flow process after, can be by this terminal exiting network of anchor point PC notice corresponding anchor gateway.

Then get into step 702, anchor gateway according to the MBS business information at this terminal of being preserved, if the MBS that discovery need be withdrawed from is professional, is then sent the MBS business to relevant MBS server and is withdrawed from request after finding this terminal exiting network, and the MBS business is withdrawed from request.

Then get into step 703, after the MBS server is received this request, revise the context and/or the professional context of this MBS at this terminal, and stop the MBS charging at this terminal, informing network side key management entity stops this terminal is carried out the key updating of MBS.Thereby make the terminal when shutting down, also can normally withdraw from the MBS business, stop the charging of this business because of accident.

Need to prove; The related network elements that in above-mentioned each execution mode, relates to is base station, gateway, paging controller and MBS server, but in practical application, MBS agency (MBS Proxy) or other gateways can also be arranged; Its concrete operations and base station or gateway are similar, repeat no more at this.

Seventh embodiment of the invention relates to a kind of multicast and broadcast system; Comprise at least one in this system and be used to provide the MBS MBS server of service; And the bearer network that connects MBS server and terminal; This MBS server also is used for after receiving that the terminal is withdrawed from the request of MBS or terminated as the terminal condition that service is provided and satisfies, and indication network side key management entity stops to carry out for this terminal the key updating of MBS.Through stopping key for this terminal updating MBS business, make when the MBS business cipher key changes that the terminal can't continue to use this MBS professional, guarantee that through this method the terminal is stopping this MBS of back termination use that charges.Comprise gateway, anchor gateway, anchor point PC and base station in this bearer network.

Anchor gateway also further comprises one of following or its combination in any: after finding that MBS need be withdrawed from the terminal, when confirming terminal exiting network, the unit of MBS is withdrawed from this terminal of gateway at notice MBS server or this terminal; And/or after receiving that the notice of MBS is withdrawed from the terminal, revise contextual unit, terminal.

Gateway also further comprises with one of lower unit or its combination in any: after receiving that the notice of this MBS is withdrawed from the activated state terminal, the unit of MBS is withdrawed from this terminal of notice MBS server; After MBS is withdrawed from the terminal, revise the context and/or the professional corresponding contextual unit of MBS at terminal; After MBS was withdrawed from the terminal, the notice anchor gateway was revised the contextual unit at this terminal; After MBS was withdrawed from the terminal, the unit of MBS was withdrawed from this terminal, base station of notifying this terminal to belong to.

The base station also further comprises with one of lower unit or its combination in any: withdraw from the notice of MBS at the terminal after, revise the unit of user's context and/or the unit of this MBS business contexts; After receiving that the notice of MBS is withdrawed from the terminal, revise the unit of the user number counting of corresponding MBS; Judge whether amended user number counting satisfies the judging unit of predetermined condition, trigger the first module of the adjustment flow process of this MBS carrying; When judging unit judged that amended user number counting satisfies predetermined condition, first module triggered the adjustment flow process that this MBS carries.

Anchor point PC also further comprises with one of lower unit or its combination in any: when finding that MBS need be withdrawed from the Idle state terminal, when confirming the Idle state terminal exiting network, initiate the unit that the request of this MBS is withdrawed from the terminal to the professional corresponding MBS server of this MBS; After receiving that the notice of MBS is withdrawed from the terminal, revise contextual unit, this terminal; After receiving that the notice of MBS is withdrawed from the terminal, notify the anchor gateway at this terminal to revise contextual unit, terminal.

Through anchor gateway, gateway and anchor point PC, make no matter the terminal is under activated state, or under Idle state, no matter be that the MBS business is initiatively hoped to stop in the terminal, or, all can normally withdraw from the MBS business because of the unexpected shutdown of external cause, stop the charging of this business.

Need to prove, more than said each unit be logical block, in practical application, can in same physical location, realize, or be divided into a plurality of physical locations and realize.

Based on above embodiment, when the MBS server receive the terminal withdraw from the MBS service request after, when perhaps network side initiatively required the terminal to withdraw from MBS professional qualification to satisfy, it was professional to guarantee that follow-up terminal can not receive this MBS, the MBS server has following action:

1) can notify MBS authorization key (MBS Authorization Key, be called for short " MAK ") key management entity, this terminal is deleted from the tabulation of its maintenance, this terminal not upgraded when guaranteeing follow-up MAK key updating; Possibly trigger simultaneously this key management entity and initiate key updating process;

2) can the group of notifications key-encrypting key (Group Key Encryption Key is called for short " GKEK ") key management entity, this terminal is deleted from the tabulation of its maintenance, this terminal is not upgraded when guaranteeing follow-up MAK key updating; Possibly trigger simultaneously this key management entity and initiate key updating process;

3) can notify MBS cryptographic-key used for encrypting group service (MBS Group Traffic Encryption Key; Be called for short " MGTEK ") the key management entity; This terminal is deleted from the tabulation of its maintenance, this terminal is not upgraded when guaranteeing follow-up MAK key updating; Possibly trigger simultaneously this key management entity and initiate key updating process.

In sum, in each execution mode of the present invention, after the MBS server receives that the terminal is withdrawed from the request of MBS or terminated as the terminal condition that service is provided and satisfies; With the context of revising the terminal and/or the professional context of relevant MBS; Stop the MBS service billing, and network side key management entity stops to carry out key updating for this terminal, make the terminal in the active initiation request or passively stop to receive MBS when professional; All can normally withdraw from the MBS business, stop the professional charging of this MBS.

If the terminal is the terminal of activated state, then after the MBS server confirms that the MBS business is withdrawed from the terminal, by the direct notification service gateway of MBS server; Or through anchor gateway notify indirectly gateway this withdraw from information; After impelling gateway to receive that the notice of this MBS is withdrawed from the terminal, revise terminal and professional related context, and the notice anchor gateway is revised the terminal context; And notify this terminal, base station at this place, terminal to withdraw from MBS; The base station is revised user's context and/or is revised this MBS business contexts, revises the user number counting of corresponding MBS, and triggers the adjustment flow process that this MBS carries according to this user number counting.

This adjustment flow process comprises one of following or its combination in any:

If MBS is through the PTM mode carrying; And amended user number counting is less than first thresholding; Then trigger the precise statistics of MBS number of users, if the number of users of precise statistics satisfies the condition of carrying MBS through ptp mode, then the base station is adjusted into PTP with the bearing mode of this MBS by PTM; Thereby reduce expending of service resources, improve the utilance of resource;

If amended user number counting is 0, then show current this MBS of activated state terminal use that do not have, trigger the precise statistics of MBS number of users; Detect current this MBS of Idle state terminal use that whether also has; If the number of users that precise statistics goes out is similarly 0, then the base station notifies its gateway to stop to this base station distributing data, and can remove MBS between this base station and its gateway simultaneously and carry and discharge the corresponding interface-free resources of this MBS; Avoid resource by vacant, form the wasting of resources;

If MBS carries through ptp mode, then the base station need not to wait until that all with withdrawing from this MBS per family, can discharge the corresponding interface-free resources in this terminal in advance, makes resource in time to be recycled, and improves the utilance of resource;

If MBS is not used in gateway subordinate's base station, then this gateway need initiate to remove register flow path to the MBS server, notifies it to stop playing releasing idling-resource equally to these gateway distribution service data again, avoids the effect of the vacant formation waste of resource.

Withdrawing from the professional request of MBS can adopt specific signaling to send to the MBS server indirectly through anchor gateway by the terminal according to the characteristics of WiMAX network, or sends to the MBS server indirectly through base station and Service Gateway, and flexibility is higher.

If the MBS server provides the condition triggering terminal of service to withdraw from corresponding MBS business according to terminating as the terminal; Then at first notify gateway with terminal information and corresponding MBS information; When sending notice or after receiving the response message of gateway; The contextual information and the business contexts at MBS server update terminal terminate as this terminal service are provided.

If state the terminal is the Idle state terminal; Then pass through anchor point paging controller (the Paging Controller at terminal; Be called for short " PC ") initiate the request that this MBS is withdrawed from the terminal to the professional corresponding MBS server of MBS; The terminal can be upgraded through the position in when shutdown and trigger anchor point PC and send the professional request of MBS of withdrawing from, and also can initiatively withdraw from the MBS business to anchor point PC request through the base station by the terminal, and anchor point PC withdraws from request according to this request to the MBS of correspondence server initiation MBS business.Make that no matter the terminal is initiatively to hope to stop this MBS business, or because of the unexpected shutdown of external cause, all can normally withdraw from the MBS business, stops the charging of this business.

The MBS business that withdraws from for the terminal exiting network initiation; Can initiate the request that this MBS is withdrawed from the terminal to the professional corresponding MBS server of MBS through the anchor gateway at terminal; For the activated state terminal, no matter initiatively move back net, passively move back net or accident is moved back net, anchor ASN-GW can receive from gateway or serving BS be used to indicate the user to move back the message of net; For the Idle state terminal; No matter initiatively move back net, passively move back net or accident is moved back net, anchor point PC handle move back the net flow process after, can notify the anchor gateway user to move back net.Anchor gateway is initiated the MBS business according to the MBS business information in the terminal context of its maintenance to the MBS of correspondence server and is withdrawed from request.Make the terminal in any net scene of moving back, all can normally withdraw from the MBS business, stop the charging of this business.

After MBS is withdrawed from the terminal, if in the coverage of base station, place, this terminal endless participate in this MBS, then the base station discharges the carrying of MBS, and notifies the gateway under this base station to revise the MBS user list of being preserved; If gateway has the carrying that all base stations have all discharged MBS under its command, then gateway removes to register MBS to the MBS server requests, discharges respective resources.Through business demand is in time detected, when no professional demand, in time discharge related resource, make the MBS service resources to be fully utilized, improved resource utilization.

Though through reference some preferred implementation of the present invention; The present invention is illustrated and describes; But those of ordinary skill in the art should be understood that and can do various changes to it in form with on the details, and without departing from the spirit and scope of the present invention.

Claims

1. the method for terminal to exit from multicast broadcasting service in the microwave access global intercommunication network is characterized in that, comprises following steps:

After Multimedia Broadcast Multicast Service MBS server received that the terminal is withdrawed from the request of MBS or terminated as the terminal condition that service is provided and satisfies, network side key management entity stopped to carry out for this terminal the key updating of MBS;

Said terminal is the terminal of activated state, and said method also comprises following steps:

After said MBS server confirms that said MBS is withdrawed from said terminal, notify the said terminal of gateway at said terminal to withdraw from this MBS;

After said gateway receives that the notice of this MBS is withdrawed from the terminal, also comprise one of following steps or its combination in any: the context of revising said terminal; Revise the professional corresponding context of said MBS; The notice anchor gateway is revised the context at said terminal; Notify the said terminal, base station at this place, terminal to withdraw from this MBS.

2. the method for terminal to exit from multicast broadcasting service in the microwave access global intercommunication network according to claim 1; It is characterized in that; After said MBS server receives that the terminal is withdrawed from the request of MBS or terminated as the terminal condition that service is provided and satisfies; Also revise the context and/or the professional corresponding context of said MBS at said terminal, and stop the MBS at this terminal is chargeed.

3. the method for terminal to exit from multicast broadcasting service is characterized in that in the microwave access global intercommunication network according to claim 1,

After said base station receives that the notice of this MBS is withdrawed from said terminal, also comprise one of following steps or its combination in any: revise the terminal context; Revise the professional context of said MBS; Revise the user number counting of corresponding MBS,, then trigger corresponding adjustment flow process according to this predetermined condition if amended said user number counting satisfies predetermined condition.

4. the method for terminal to exit from multicast broadcasting service is characterized in that in the microwave access global intercommunication network according to claim 3, and said terminal is withdrawed from the information of said MBS and notified said gateway by MBS server or anchor gateway.

5. the method for terminal to exit from multicast broadcasting service is characterized in that in the microwave access global intercommunication network according to claim 3, saidly triggers corresponding adjustment flow process according to this predetermined condition and comprises one of following or its combination in any:

If said MBS carries through point to multipoint mode; And amended said user number counting is less than first thresholding; Then trigger the precise statistics of said MBS number of users; If the number of users of precise statistics satisfies the condition of carrying said MBS through point-to-point mode, then the base station is carried said MBS and is adjusted into the point-to-point bearing mode;

If said amended user number counting is 0; Then trigger the precise statistics of said MBS number of users; If the number of users that precise statistics goes out is similarly 0; Then the base station notifies its gateway to stop to this MBS business datum of this base station distribution, and/or removes the MBS carrying between this base station and its gateway and discharge the corresponding interface-free resources of this MBS;

If said MBS carries through point-to-point mode, then the base station discharges the corresponding interface-free resources in said terminal;

If said MBS is not used in gateway subordinate's base station, then this gateway initiates to go register flow path to the MBS server, and notice MBS server stops to this this MBS business datum of gateway distribution, and/or discharges the corresponding carrying of this MBS.

6. the method for terminal to exit from multicast broadcasting service in the microwave access global intercommunication network according to claim 5; It is characterized in that said gateway is the multi-broadcast group of removing the corresponding tunnel of MBS or leaving this MBS to the mode of MBS server releasing bearing.

7. the method for terminal to exit from multicast broadcasting service is characterized in that in the microwave access global intercommunication network according to claim 1, and the request of the said MBS of withdrawing from is sent to said MBS server through anchor gateway by said terminal;

Or send to said MBS server through base station and/or gateway by said terminal;

Or act on behalf of said terminal by one of base station, gateway, anchor gateway, anchor point paging controller or its combination in any and send to said MBS server.

8. the method for terminal to exit from multicast broadcasting service is characterized in that in the microwave access global intercommunication network according to claim 1, and said MBS server receives that from the gateway at said terminal said terminal withdraws from the request of MBS;

Said MBS server receives that from the gateway at said terminal said terminal further comprises before withdrawing from the request of MBS: one of said terminal, base station, place, said terminal, place, said terminal anchor gateway or its combination in any are sent the request that MBS is withdrawed from said terminal to said gateway.

9. the method for terminal to exit from multicast broadcasting service in the microwave access global intercommunication network according to claim 1; It is characterized in that; Said MBS server is after the condition that terminates as the terminal and provide service satisfies; The Indication message that will comprise said terminal information and corresponding MBS information sends to gateway and notifies the said terminal of this gateway need withdraw from this MBS business; And upgrade the contextual information and/or the said MBS business contexts at said terminal, and stopping the MBS at this terminal is chargeed, network side key management entity stops to carry out for this terminal the key updating of MBS.

10. the method for terminal to exit from multicast broadcasting service is characterized in that in the microwave access global intercommunication network according to claim 1, if said terminal is the Idle state terminal, then also comprises following steps:

When the anchor point paging controller need withdraw from MBS at definite said terminal, initiate the request that this MBS is withdrawed from said terminal to the professional corresponding MBS server of this MBS.

11. the method for terminal to exit from multicast broadcasting service is characterized in that in the microwave access global intercommunication network according to claim 10, said anchor point paging controller confirms that said terminal need withdraw from this MBS when finding said Idle state terminal exiting network;

Said anchor point paging controller is confirmed said Idle state terminal exiting network in one of following situation: said Idle state terminal is triggered to comprise and is moved back more new technological process of position that network mark knows; Or the network side checking authorizes one of charging aaa server, anchor point paging controller, anchor gateway or its combination in any to trigger said Idle state terminal exiting network.

12. the method for terminal to exit from multicast broadcasting service in the microwave access global intercommunication network according to claim 10; It is characterized in that; Said anchor point paging controller receive that said Idle state terminal sends withdraw from the professional request of said MBS the time, confirm that said terminal need withdraw from MBS;

The said professional request of said MBS of withdrawing from is sent through the base station in said base station.

13. the method for terminal to exit from multicast broadcasting service in the microwave access global intercommunication network according to claim 10; It is characterized in that; Also comprise following steps: after said MBS server confirms that said MBS business is withdrawed from said terminal, notify the said terminal of said anchor point paging controller to withdraw from this MBS;

After said anchor point paging controller receives that the notice of MBS is withdrawed from said terminal, carry out one of following operation or its combination in any: revise the terminal context; Return professional exit confirmation message through said base station to said terminal; The notice anchor gateway is revised the terminal context.

14. the method for terminal to exit from multicast broadcasting service is characterized in that in the microwave access global intercommunication network according to claim 1,

When anchor gateway need withdraw from MBS at definite said terminal, initiate the request that this MBS is withdrawed from said terminal to the professional corresponding MBS server of this MBS.

15. the method for terminal to exit from multicast broadcasting service is characterized in that in the microwave access global intercommunication network according to claim 14, said anchor gateway confirms that said terminal need withdraw from this MBS when finding said terminal exiting network;

Said anchor gateway is confirmed said terminal exiting network in one of following situation: said terminal is triggered under activated state or Idle state and is moved back the net flow process; Or one of network side aaa server, anchor point paging controller, home agent, external agent or its combination in any trigger said terminal exiting network.

16. the method according to terminal to exit from multicast broadcasting service in each described microwave access global intercommunication network in the claim 2,3,9,13 is characterized in that,

Revise said terminal context in the following manner: described MBS service related information is deleted from the context of said terminal;

Revise said MBS business contexts in the following manner: described terminal related information is deleted from said MBS business contexts.

17. multicast and broadcast system; Comprise at least one and be used to provide the MBS MBS server of service; And the bearer network that connects MBS server and terminal; It is characterized in that said MBS server is used for after receiving that the terminal is withdrawed from the request of MBS or terminated as the terminal condition that service is provided and satisfies, indication network side key management entity stops to carry out for this terminal the key updating of MBS;

Comprise gateway in the said bearer network;

Said gateway further comprises with one of lower unit or its combination in any: after receiving that the notice of this MBS is withdrawed from the activated state terminal, the unit of MBS is withdrawed from this terminal of notice MBS server; After MBS is withdrawed from said terminal, revise the context and/or the professional corresponding contextual unit of said MBS at said terminal; After MBS was withdrawed from said terminal, the notice anchor gateway was revised the contextual unit at said terminal; After MBS was withdrawed from said terminal, the unit of MBS was withdrawed from this terminal, base station of notifying this terminal to belong to.

18. multicast and broadcast system according to claim 17 is characterized in that, said bearer network also comprises the base station;

This base station further comprises with one of lower unit or its combination in any: after receiving that the notice of MBS is withdrawed from the terminal, revise the terminal context and/or revise the unit of said MBS business contexts; After receiving that the notice of MBS is withdrawed from the terminal, revise the unit of the user number counting of corresponding MBS; Judge whether amended said user number counting satisfies the judging unit of predetermined condition; Trigger the first module of the adjustment flow process of this MBS carrying; When said judging unit judged that amended said user number counting satisfies predetermined condition, said first module triggered the adjustment flow process that this MBS carries.

19. multicast and broadcast system according to claim 17 is characterized in that, said multicast and broadcast system also comprises anchor gateway;

This anchor gateway further comprises: after MBS need be withdrawed from definite said terminal, notify this terminal of gateway at said MBS server and/or this terminal to withdraw from the unit of MBS; And/or, after receiving that the notice of MBS is withdrawed from the terminal, revise contextual unit, said terminal.

20. multicast and broadcast system according to claim 17 is characterized in that, said multicast and broadcast system also comprises the anchor point paging controller;

Said anchor point paging controller further comprises with one of lower unit or its combination in any: in the time of need withdrawing from MBS at definite Idle state terminal, initiate the unit that the request of this MBS is withdrawed from said terminal to the professional corresponding MBS server of this MBS; After receiving that the notice of MBS is withdrawed from the terminal, revise contextual unit, said terminal; After receiving that the notice of MBS is withdrawed from the terminal, notify the anchor gateway at this terminal to revise contextual unit, said terminal.

21. according to any one described multicast and broadcast system in the claim 18 to 20, it is characterized in that,

Contextual unit, said modification terminal is revised the terminal context in the following manner: said MBS service related information is deleted from the context of said terminal;

The unit of said modification MBS business contexts is revised said MBS business contexts in the following manner: described terminal related information is deleted from said MBS business contexts.