CN101030921B

CN101030921B - Packet-broadcasting controlling system and method

Info

Publication number: CN101030921B
Application number: CN2006100340795A
Authority: CN
Inventors: 吴向阳; 严军; 李金成
Original assignee: Huawei Technologies Co Ltd
Current assignee: Huawei Technologies Co Ltd
Priority date: 2006-03-02
Filing date: 2006-03-02
Publication date: 2012-05-23
Anticipated expiration: 2026-03-02
Also published as: CN101313515A; CN101030921A; CN101313515B

Abstract

The method comprises: 1) AF gets the message required to made multicast control; 2) AF requests the SPDF to make multi cast; after the SPDF process the request, it sends a request to BGF; the BGF processes the request; 3) BGF builds the forwarding path of multicast to the multicast service provider; 4) the BGF returns the request confirmation to the AF through SPDF; 5) once the BGF receives the multicast stream, it converts the multicast stream and sends it the user. The invention also provides a multicast control system.

Description

A kind of packet-broadcasting controlling system and method

Technical field

The present invention relates to packet-broadcasting controlling system and method.

Background technology

SIP (Session Initiation Protocol; Session initiation Protocol) be by IETF (The InternetEngineering Task Force; One of multimedia communications system framework agreement of the Internet engineering duty group) working out; Be be used to set up, the application layer protocol of change or ending multimedia session, with RTP (RealtimeTransport Protocol, RTP)/RTCP (Real-time Transport Control Protocol; RTCP Real-time Transport Control Protocol), SDP (Session Description Protocol; Session Description Protocol), RTSP (Real Time Stream Protocol, real-time streaming protocol), DNS agreements such as (Domain Name System andDomain Name Service protocol, domain name system (service) agreements) cooperate; Common session foundation and the media negotiation of accomplishing among the IMS (IP Multimedia Subsystem, IP Multimedia System); In case set up session, Media Stream will use Real-time Transport Protocol in bearing bed, directly to transmit, can mutual flexibly multiple medium in a session.

Because SIP based on disclosed Internet (the Internet) standard, has inherent advantage aspect voice, data service combination and the intercommunication, can cross over medium and equipment and realize calling out control; Support abundant media formats, can dynamically increase/delete Media Stream, realize abundant more traffic performance easily; Simultaneously, SIP supports intelligence to professional and end side development, thereby alleviates network burden; Itself support to comprise dynamic registration machine-processed, application layer mobility functions and Presence (description)/Fork (bifurcated)/subscription characteristic such as location management is machine-processed, redirection mechanism; Be convenient to expand new business, and agreement is simple, has generally acknowledged expansion potentiality; Therefore obtained to be included in the increasing application among IMS and the NGN (Next Generation Network, next generation network).

In today of communication and the development of IT technology height; Appearance along with the IP technology of striding the link layer transmission medium; What Internet used popularizes rapidly, and meanwhile, people also no longer are satisfied with single voice communication mode; And need brand-new multimedia communication mode, the fusion of IPization, Internet and the communication network of mobile communication network and fixed telecommunication network to become the developing direction that industry is generally acknowledged undisputedly.For satisfying the common requirements of more and more outstanding IP multimedia application; 3GPP (3rd Generation Partnership Project; The IMS of the all-IP business network framework of 3rd Generation Partnership Project) on the packet carrying network basis, introducing, target is according to personalized user data, the shielding user mode access; The degree of opening of control professional ability provides multimedia communication experiences.

IMS is WCDMA (the Wideband Code Division MultipleAccess that increases in the 3GPP R5 stage; WCDMA) is superimposed upon a sub-systems that has on the packet domain in the network; Adopt the bearer path of packet domain, introduce Session Initiation Protocol, utilize simple, the easy expansion of SIP, media combination characteristics easily as professional control protocol for its upper strata control signaling and media delivery; Through business control is separated with carrying control, abundant multimedia service is provided; Main functional entity comprises CSCF (the Call Session Control Function of functions such as control user registration, session control among the IMS; AS (the Application Server of miscellaneous service logic control function is provided CSCF); Application server), HSS (the Home Subscriber Server of centralized management user contracting data; Home subscriber server) and be used to realize MGCF (the Media Gateway Control Function with the circuit switching net interconnecting; MGCF)/IM-MGW (IP Multimedia-MGW; The IP multimedia media gateway controller), the user inserts IMS through current location proxy CSCF, and session and service trigger control reach with the business control of AS is mutual and then accomplished by the home domain serving CSCF of its registered place.

NGN is based on the pattern of fusion network of group technology; With packet switching is main; Adopt and carry the framework that separates with control; It has inherited all business of original PSTN (public switched telephone network, public exchanging telephone network), has also enough inherited mobile network's professional ability simultaneously.NGN combines the advantage of fixed-line telephone network, mobile telephone network and IP network, makes analog subscriber, digital subscriber, mobile subscriber, ADSL user, isdn user, IP narrowband network user, IP broadband network user or even the user who inserts via satellite to intercom mutually as a member in the next generation network.

See also Fig. 1; It is RACS (Resource and Admission Control Subsystem; Resource and permission control subsystem) the functional frame composition; RACS is the sub-systems among the NGN, the RACS framework has been carried out detailed elaboration at TISPAN document ETSI ES 282 003V < 1.6.6>in (2005-10).RACS can provide resource and permission control support for service application.

The IP multicast is to send professional technology with Class D IP address; Be used for transmit leg simultaneously when a plurality of recipients (more than or equal to) send the identical services content; Because identical content only need send a getting final product to designated multicast services addresses and port, thereby can effectively reduce the load of professional transmit leg and transmission network.In order to obtain multicast content; Content recipient is through adding professional multicast group (as using IGMP (Internet Group Management Protocol; The Internet igmpinternet)) require the router of adjacency to send business tine to oneself; Then pass through multicast routing protocol between the router (like PIM-SM (protocol-independentmulticast-sparse mode; Protocol Independent Multicast-sparse mode) agreement etc.) with other router alternately to set up multicast forwarding path, the multicast service content just can pass to content recipient along multicast forwarding path from multicast source like this.Use multicasting technology transport service stream, no matter how many recipients has, and professional transmit leg only need send a data flow.Multicast packet only produces single data flow the transmission point on the transfer path from professional transmit leg to the recipient, obviously use multicasting technology can alleviate the load of transmit leg, and can effectively utilize Internet resources.

See also Fig. 2, it is the sketch map that existing RACS framework is set up multicast forwarding path.When using the RACS framework to cooperate with other networking component to provide multicast service to support, existing framework does not provide effective multicast to control support.This is because the process of setting up of multicast path can not guarantee that the group business stream that professional transmit leg provides necessarily passes through BGF (Border Gateway Function; Border Gateway Function) provides to CPE (Customer Premises Equipment, customer headend equipment).Wherein there is a multicast compatible network between RCEF (ResourceControl Enforcement Function, Resource Control Enforcement Function) and the BGF, also has a multicast compatible network between BGF and the multicast service supplier; Multicast path according to general is set up process; User's IGMP message information is received by RCEF through CPE that (RCEF is first IP three-layer equipment on from the terminal to the BGF path here; IGMP is handled by it) and handle; RCEF re-uses multicast routing protocol (like the PIM-SM agreement etc.) request neighbor router and sends group business stream setting up multicast forwarding path to it then, but has a multicast compatible network between RCEF and the BGF here, and this possibly cause the final multicast forwarding path of setting up of RCEF not through BGF but pass through router; Certainly, need said router also can be established to multicast service supplier's multicast forwarding path here.If group business stream is without BGF, BGF just can't control user's resource so.

Summary of the invention

Technical problem to be solved by this invention is to provide a kind of packet-broadcasting controlling system and the method that can effectively control user's resource operating position.

For solving the problems of the technologies described above; The technical scheme that the present invention adopted is: a kind of packet-broadcasting controlling system is provided; It comprises terminal, application function AF module, the strategy decisive function SPDF module based on business, Border Gateway Function BGF module, service supplier and multicast functionality supplier, wherein

Said terminal and service supplier carry out service negotiation, and requested service the supplier provide multicast services;

Said AF module obtains to carry out the information of multicast conversion, then asks the SPDF module to carry out the multicast conversion if need carry out the multicast conversion to Business Stream;

Said SPDF module receives the multicast conversion request of AF module and carries out the strategy judgement and the resource inspection, whether allows to accomplish corresponding conversion with decision, if allow then to ask the BGF module to accomplish concrete multicast conversion operations;

Said BGF module is established to multicast functionality supplier's multicast forwarding path, and converts the group business stream that receives from the multicast functionality supplier to unicast service and flow to the terminal and send.

For solving the problems of the technologies described above; Another technical scheme that the present invention adopted is: a kind of packet-broadcasting controlling system is provided; It comprises terminal, AF module, SPDF module, BGF module, access-resource and permission control function Access-Resource and Admission Control Function, Resource Control Enforcement Function RCEF, service supplier and multicast functionality supplier; Wherein

Said BGF module is established to multicast functionality supplier's multicast forwarding path; Said SPDF module is sent request to Access-Resource and Admission Control Function, adds the new multicast group of being distributed by Access-Resource and Admission Control Function request RCEF, and RCEF accepts described request and uses multicast routing protocol to be established to the multicast forwarding path of BGF module; Said BGF module converts the group business stream that receives from the multicast functionality supplier to new multicast service and flows through the BGF module to RCEF, and RCEF sends to the terminal to the multicast forwarding path at terminal.

For solving above-mentioned another technical problem, the technical scheme that the present invention adopted is: a kind of multicast control method is provided, and it may further comprise the steps:

A1.AF obtains the information that need carry out multicast control;

A2.AF request SPDF carries out multicast control, and after described request was handled by SPDF, SPDF further filed a request to BGF, and described request is handled by BGF;

A3.BGF is established to multicast functionality supplier's multicast forwarding path through multicast routing protocol;

A4.BGF responds to the AF feedback request through SPDF;

In case A5. BGF receives group business stream, BGF just carries out said Business Stream the multicast conversion and sends to the user.

The invention has the beneficial effects as follows: because packet-broadcasting controlling system of the present invention and method make group business stream transmit through BGF; Thereby make network can effectively control user's resource operating position, and can provide accurate metric (like flux of multicast) foundation to be provided for chargeing.

Description of drawings

Fig. 1 is the functional frame composition of RACS;

Fig. 2 is the sketch map that existing RACS framework is set up multicast forwarding path;

Fig. 3 is the multicast control procedure sketch map of first embodiment of the invention packet-broadcasting controlling system;

Fig. 4 is the multicast control procedure sketch map of second embodiment of the invention packet-broadcasting controlling system;

Fig. 5 is that the first embodiment of the invention packet-broadcasting controlling system is applied in and adopts IMS as the concrete function Organization Chart in session control and the professional NGN network that network is provided;

Fig. 6 is the multicast procedures sketch map of NGN network shown in Figure 5;

Fig. 7 is that the second embodiment of the invention packet-broadcasting controlling system is applied in and adopts IMS as the concrete function Organization Chart in session control and the professional NGN network that network is provided;

Fig. 8 is the multicast procedures sketch map of NGN network shown in Figure 7.

Embodiment

See also Fig. 1, AF (Application Function, application function) is not a standalone feature entity in TISPAN NGN framework, but to being present in professional RACS and the service application concise representation that mutual function collection is arranged with RACS.Like the proxy CSCF in the IMS network is exactly an example, and it and RACS have the function of AF when mutual.

AF can use multiple mode to obtain need to carry out the information of multicast control and carry out control corresponding, and possible mode comprises:

1. terminal and multicast functionality supplier use signaling (consulting as the using SIP) mechanism of consulting to consult multicast service employed multicast service address and port; Said negotiation signaling is transmitted through AF (like the proxy CSCF in the IMS network), and then AF can obtain carrying out the necessary information (as checking that the SDP load of carrying among the SIP obtains multicast service address and port) of multicast control through checking the business description information in the negotiation packet;

2. the multicast functionality supplier controls to AF request carrying out multicast after receiving the multicast service request that send at the terminal, and the information that gives particulars; Here do not need negotiation packet through AF, even negotiation packet process AF, AF need not understand said signaling yet.

Here, AF must obtain the combination of following information or following information in order to accomplish necessary multicast control procedure: multicast service address and port, the address of sending multicast service and port, terminal receive professional address and port.These information can be through checking that the negotiation packet content obtains perhaps to be informed by service supplier.

After AF need carry out the information of multicast control in acquisition, through BGF, AF can adopt following dual mode to carry out multicast control in order to ensure group business stream:

First kind of mode:

AF request SPDF (Service-based Policy Decision Function is based on the strategy decisive function of business) carries out multicast control, after described request is handled by SPDF; SPDF further files a request to BGF.Described request requirement BGF schedule of apportionment is broadcast and is sent address and port and be established to the multicast forwarding path that multicast service sends the address; In case BGF receives group business stream; BGF just should change said work flow into unicast service stream and send to the user; The result of conversion is: with institute's addresses distributed and port is the source address and the port of Business Stream, and receiving professional address and port with the terminal is destination address and port.If there are a plurality of users to ask same group business stream; Then BGF need set up relevant user list for each group business stream; This tabulation can receive professional address and port as differentiation with the terminal, if Add User, and the corresponding list item of interpolation in table then; If the user withdraws from Business Stream, then from table, delete corresponding list item; When carrying out the Business Stream conversion, BGF obtains the terminal and receives professional address and port from Business Stream multicast service address and the corresponding list item of port, and carries out corresponding business and transmit.

After the distribution of BGF completion unicast address and port, need through SPDF result to the AF feedback allocation; Like this can so that AF according to the message of control results modification service negotiation process to guarantee the correct completion of service negotiation process, this situation is suitable for the situation of service negotiation message through AF; Simultaneously also can be so that AF can be to requestor's feedback allocation result of multicast control, so that initiation request person can take alternate manner to the new services addresses of user notification.

The second way:

AF request SPDF carries out multicast control, and described request is handled by SPDF; Further file a request by SPDF to BGF.Possibly carry multicast service address and port set Broadcast Control system process that a SPDF distributes in the described request; If SPDF unallocated multicast service address and port; Then require BGF to distribute a multicast service address and port (also possibly need distribute multicast services addresses and port to a multicast group management equipment request by BGF; Said multicast group management equipment is carried out unified management to avoid conflict to available multicast service address and port); Require a BGF distribution unicast address and a port in addition and be established to the address of transmission multicast service and the multicast forwarding path of port; In case BGF receives group business stream; BGF just should carry out the multicast conversion to said Business Stream, and the result of conversion is: Business Stream is source address and port with newly assigned unicast address and port, is destination address and port with newly assigned multicast service address and port.The result of conversion sends to the terminal.Owing to distributed new multicast service address and port; Said address and port can feed back to the terminal through SPDF and AF; Then the terminal can add this new multicast group; Its essence is that the terminal adds said multicast group with IGMP agreement and RCEF interactive requirements, RCEF then uses multicast routing protocol (like PIM-SM etc.) to be established to the multicast forwarding path of BGF.

BGF needs the result to the AF feedback allocation through SPDF after the distribution of accomplishing multicast service address and port, unicast address and port; Like this can be so that AF has an opportunity to revise the message of service negotiation process; Make the user obtain correct business and send the address, thereby can initiate correct multicast adition process (using the IGMP agreement); This situation is suitable for the situation of service negotiation message through AF; Simultaneously also can be so that AF can be to requestor's feedback allocation result of multicast control, so that initiation request person can take alternate manner to the new services addresses of user notification.

The first embodiment of the invention packet-broadcasting controlling system comprises terminal, AF, SPDF, BGF, service supplier and multicast functionality supplier.Wherein: terminal and service supplier carry out service negotiation, and requested service the supplier provide multicast services; AF obtains the information of carrying out the multicast conversion in several ways, then asks SPDF to carry out the multicast conversion if need carry out the multicast conversion to Business Stream; SPDF receives the multicast conversion request of AF and carries out strategy and judge whether inspection allows to accomplish corresponding conversion with decision with resource, then asks the concrete multicast conversion operations of BGF completion as if allowing; BGF is established to multicast functionality supplier's multicast forwarding path, and converts the group business stream that receives from the multicast functionality supplier to unicast service and flow to the terminal and send, and possibly need in this process to divide to be used in the address of transmitting Business Stream and port etc.

See also Fig. 3, the multicast control procedure of first embodiment of the invention packet-broadcasting controlling system is:

S11.AF sends the multicast control request to SPDF, and described request is carried multicast service address and port, the address of transmission multicast service and the combinations that port, terminal receive the whole or above-mentioned information of information such as professional address and port;

S12.SPDF constructs the request to BGF according to the request of AF, and request BGF multicasts to the conversion operations of clean culture; Described request is specifically handled by BGF, carries the address of multicast service address and port, transmission multicast service and the combinations that port, terminal receive the whole or above-mentioned information of information such as professional address and port at least; BGF divides unicast address and the port that is used in the transmission Business Stream and prepares to multicast to the conversion operations of clean culture after receiving above-mentioned request; Promptly receive and transform as follows after the group business stream: with distributed unicast address and port as Business Stream source address and port; As destination address and port, the result of conversion transmits to the terminal with terminal traffic address and port.If there are a plurality of users to ask same group business stream, then BGF can be that each group business stream sets up relevant user list, this tabulation with user's unicast address and port as differentiation, if Add User, the corresponding list item of interpolation in table then; If the user withdraws from Business Stream, then from table, delete corresponding list item; When carrying out the Business Stream conversion, BGF obtains station address and port from Business Stream multicast service address and the corresponding list item of port, and carries out corresponding business and transmit;

S13.BGF is after accomplishing above-mentioned preparation; Use multicast routing protocol (like PIM-SM agreement, PIM-DM (protocol-independent multicast-dense mode here; Protocol Independent Multicast Routing Protocol-dense mode), DVMRP (Distance Vector Multicast Routing Protocol; The distance vector multicast routing protocol) or MOSPF (Multicast Open Shortest Path First, the multicast shortest path is through priority protocol) etc.) be established to multicast functionality supplier's multicast forwarding path;

S14.BGF responds to the SPDF feedback request after accomplishing above-mentioned preparation, need carry the unicast address and the port that are used to carry out professional forwarding that are distributed here;

S15.SPDF carries the unicast address and the port that are used to carry out professional forwarding that are distributed at least to the response of AF feedback request.

Through after the above flow process, AF has obtained to be used for professional unicast address and the port of transmitting, and it can do different disposal according to service needed, as:

AF is through analyzing the multicase control information that the service negotiation signaling obtains; Then it need revise the service address information of negotiation packet, sends the address so that the terminal obtains new business;

AF is that multicast control is carried out in the request of accepting other entity; Then it need possibly carry professional forwarding address and the port that is distributed among the said result to said entity FEEDBACK CONTROL result.

Through after the processing of above process, it is unicast address and the port that BGF distributed in fact that the business that the terminal obtains provides the address, and it is at own service address and port latency services stream; BGF has set up the multicast forwarding path from the multicast functionality supplier to BGF.When group business stream is received by BGF after the multicast functionality supplier sends; BGF carries out Business Stream conversion operation; Be Business Stream source address and port promptly, convert group business stream into unicast service so that to receive professional address and port be Business Stream destination address and port at the terminal and flow and send to the terminal with own institute's addresses distributed and port.Process result is that Business Stream is a multicast between multicast functionality supplier and BGF like this, between BGF and terminal, is clean culture.

BGF is established to (like PIM-SM etc.) that multicast functionality supplier's process is to use multicast routing protocol to carry out; Therefore; If the same multicast data flow of a plurality of terminal request is arranged, route is set up process and only need be carried out once just passablely, and follow-up request can not cause repeatedly the route request of setting up.SPDF can judge whether it is same Business Stream according to Business Stream multicast service address and port and service source address and port when carrying out resource reservation request; If same Business Stream; Then need not carry out repeatedly reservation request, thereby simplify flow process same group business stream in core-network side.

For the terminal of the same group business stream of request, BGF need distribute a new address and port for each request; If there is available address pool in its Access Network side, then can from available address pool, distribute address and port; Certainly, must be consistent in the result who feeds back to AF with the selection result here.

In above-mentioned flow process; If AF carries out to the multicast control request of RACS stage by stage; Promptly request just asks RACS to carry out the preparation of multicast/unicast conversion for the first time; But might not require BGF to add multicast group, then BGF sets up process to multicast functionality supplier's multicast path and here can not carry out; When AF asked multicast/unicast conversion to begin for the second time, at this moment BGF can be established to multicast functionality supplier's multicast forwarding path again and carry out corresponding multicast/unicast conversion.

Should be noted that; Given here is to invent the flow process that thought provides in order to explain; There is reasonably variation in its flow process when joint business specifically uses, as long as said multicast control procedure was accomplished before session interaction is set up, so possible variation all allows.Step in these flow processs maybe with the use (passing to multicast control request from SPDF to SPDF and resource reservation process with a request) that combines of other step such as AF, the reasonable change that relates to flow process is all in the protection range of this patent.

The second embodiment of the invention packet-broadcasting controlling system comprises terminal, AF, SPDF, BGF, Access-Resource and Admission Control Function (Access-Resource and Admission Control Function, access-resource and permission control function), RCEF, service supplier and multicast functionality supplier.Wherein: terminal and service supplier carry out service negotiation, and requested service the supplier provide multicast services; AF obtains to carry out the information of multicast conversion in several ways, then asks SPDF to carry out the multicast conversion if need carry out the multicast conversion to Business Stream; SPDF receives the multicast conversion request of AF and carries out strategy and judge whether inspection allows to accomplish corresponding conversion with decision with resource, then asks the concrete multicast conversion operations of BGF completion as if allowing; BGF is established to multicast functionality supplier's multicast forwarding path; Said SPDF sends request to Access-Resource and Admission Control Function, adds the new multicast group of being distributed by Access-Resource and Admission Control Function request RCEF, and RCEF accepts described request and uses multicast routing protocol to be established to the multicast forwarding path of BGF; Said BGF converts the group business stream that receives from the multicast functionality supplier to the new multicast service BGF that flows through and sends to the terminal to the multicast forwarding path of BGF with RCEF to multicast functionality supplier's multicast forwarding path, possibly need to divide the address that is used in the forwarding Business Stream and port etc. in this process.

See also Fig. 4, the multicast control procedure of second embodiment of the invention packet-broadcasting controlling system is:

S21.AF sends the multicast control request to SPDF, and described request is carried multicast service address and port, the address of transmission multicast service and the combinations that port, terminal receive the whole or above-mentioned information of information such as professional address and port;

S22.SPDF constructs the request to BGF according to the request of AF, and request BGF multicasts to the conversion operations of multicast; Described request is specifically handled by BGF, carries the address of multicast service address and port, transmission multicast service and the combinations that port, terminal receive the whole or above-mentioned information of information such as professional address and port at least; Can carry new multicast service address and port that SPDF distributes in the described request, if do not carry said information in the request, SPDF can specify by BGF and distribute; Then BGF distributes a new multicast service address and a port after receiving above-mentioned request; BGF need divide unicast address and the port that is used in the transmission Business Stream in addition; And preparation multicasts to the conversion operations of multicast; Promptly receive and transform as follows after the group business stream: with is distributed unicast address and port as Business Stream source address and port, be the industry affair forwarding of going forward side by side of destination address and port with the multicast service address distributed and port.

Above-mentioned new multicast service address and port can be distributed by BGF, also can be obtained to other multicast group management entity request by BGF, and the distribution of said multicast group management entity managing multicast group also guarantees that conflict does not exist; If distribute multicast services addresses and port by BGF oneself, the mechanism that then needs guarantees not have conflict and takes place, and this can distribute the back to guarantee to a unified registers entities allocation result by BGF.In addition, above-mentioned multicast service address and port also can and carry in request to BGF and use by the SPDF distribution.

The above-mentioned multicast service address and the distribution of port can be called the multicast group management, for whether distributing new multicast service address and port to decide by SPDF or BGF:

is if multicast service address and port assignment are managed by SPDF; SPDF can determine whether needs distribute new multicast service address and port according to the strategy of having carried out; If having been arranged, the terminal using same Business Stream (as judging whether it is same Business Stream) according to multicast service address and port; Then SPDF can not distribute new multicast service address and port, only in request, carries the multicast service address and the port that have distributed and uses just passable to BGF; Otherwise need to distribute new multicast service address and port.For BGF, can simply judge whether to have added original multicast group and avoid repeating to add same multicast group; If SPDF clearly indicates BGF need not repeat to add said multicast group, then need not carry out this judgement.

is if multicast service address and port are managed by BGF; Though SPDF possibly require BGF to carry out the distribution of new multicast service address and port; But BGF can determine whether needs distribute new multicast service address and port according to the strategy of having carried out; If having been arranged, the terminal using same Business Stream (as judging whether it is same Business Stream) according to professional multicast services addresses and port and service source address and port; Then BGF can not distribute new multicast service address and port, only needs to use the multicast service address and the port that have distributed just passable; Otherwise need to distribute new multicast service address and port.In the response that feeds back to SPDF, carry employed multicast service address and port.

If do not distribute new multicast service address and port in the said process, the resource reservation process that then is associated therewith will be unnecessary (as being the resource reservation of group business stream in core net through T-RACF), can simplify flow process relatively like this.

S23. after accomplishing above-mentioned preparation, BGF uses multicast routing protocol (like PIM-SM agreement, PIM-DM, DVMRP or MOSPF etc.) to be established to multicast functionality supplier's multicast forwarding path here;

S24.BGF responds to the SPDF feedback request after accomplishing above-mentioned preparation, need carry the unicast address and port and new multicast service address and the port that are used to carry out professional forwarding that are distributed here;

S25 SPDF carries the unicast address and port and new multicast service address and the port that are used to carry out professional forwarding that are distributed to the response of AF feedback request.

Through after the above flow process, AF has obtained to be used for professional unicast address and port and new multicast service address and the port of transmitting, and it can do different disposal according to service needed, as:

AF is that multicast control is carried out in the request of accepting other entity; Then it need possibly carry the professional forwarding address and port and new multicast service address and the port that are distributed to said entity FEEDBACK CONTROL result among the said result.

Through after the processing of above process, it is multicast service address and the port that BGF distributed in fact that the business that the terminal obtains provides the address; BGF has set up the multicast forwarding path from the multicast functionality supplier to BGF.In order to set up the multicast forwarding path from RCEF to BGF, can take dual mode:

is because the user has received new multicast service address and port; Therefore it uses the IGMP protocol requirement to add said multicast group, and described request is handled by RCEF; Because new Business Stream is provided by BGF, so RCEF uses multicast routing protocol (like PIM-SM) to be established to the multicast forwarding path of BGF.

in addition; SPDF also can send request to Access-Resource and Admission Control Function; Add the new multicast group of being distributed by Access-Resource and Admission Control Function request RCEF, RCEF accepts described request and uses multicast routing protocol (like PIM-SM) to be established to the multicast forwarding path of BGF.

When group business stream is received by BGF after the multicast functionality supplier sends; BGF carries out Business Stream conversion operation; Being Business Stream source address and port with own institute's addresses distributed and port promptly, is that Business Stream destination address and port convert group business stream into new group business stream and transmit with new multicast service address and port.Process result is that Business Stream is a multicast between multicast functionality supplier and BGF like this, also is multicast (send with new multicast service address and port, Business Stream is through RCEF) between BGF and terminal, has guaranteed that group business stream transmits through BGF.

In above-mentioned flow process; If AF carries out to the multicast control request of RACS stage by stage; I.e. request for the first time just asks RACS to carry out the preparation of multicast/multicast conversion; But might not require BGF to add multicast group, then BGF sets up process to multicast functionality supplier's multicast path and here can not carry out; Multicast/when the multicast conversion began, at this moment BGF can be established to multicast functionality supplier's multicast forwarding path again and carry out corresponding multicast/multicast conversion when AF asks for the second time.

If the present invention requires AF from consult signaling, to obtain multicase control information, then AF need understand said signaling and can extract relevant information; AF need revise the media description information in the signaling, to mate the control of being done.

The present invention is following to the requirement of BGF:

1. if support first kind control mode, then BGF need support multicast/unicast conversion function, concrete as first kind of mode institute representation function; Require BGF (at the core-network side interface) to multicast routing protocol support (as supporting PIM-SM);

2. if support second kind control mode, then BGF need support multicast/multicast translation function, and is concrete like second way institute representation function; Require BGF (at the core-network side interface) to multicast routing protocol support (as supporting PIM-SM); Require BGF to send new group business stream (sending to core net one side) in addition to user access networks one side for fear of new multicast data flow.

The present invention requires RCEF to support multicast routing protocol (as supporting PIM-SM), is used to set up multicast forwarding path.

Be example to adopt IMS with business the NGN network of network to be provided below, packet-broadcasting controlling system of the present invention and method are described as session control.

See also Fig. 5, it is that the first embodiment of the invention packet-broadcasting controlling system is applied in and adopts IMS as the concrete function Organization Chart in session control and the professional NGN network that network is provided.Said system comprises terminal, proxy CSCF, SPDF, BGF, serving CSCF, AS (being service supplier), MRFC (Media ResourceFunction Controller; The media resource function controller) and MRFP (Media Resource FunctionProcessor, Media Resource Function Processor).Wherein: terminal and AS carry out service negotiation, and request AS provide multicast services; Proxy CSCF is transmitted request and the response message between terminal and the serving CSCF, and has comprised the function of AF; Serving CSCF is triggered to AS to business request information according to triggering rule, and message is carried out route; Proxy CSCF obtains to carry out the information of multicast conversion in several ways, then asks SPDF to carry out the multicast conversion if need carry out the multicast conversion to Business Stream; SPDF receives the multicast conversion request of proxy CSCF (comprising the AF function) and carries out the strategy judgement and the resource inspection, whether allows to accomplish corresponding conversion with decision, if allow then to ask BGF to accomplish concrete multicast conversion operations; BGF is established to the multicast forwarding path of AS, and converts the group business stream that receives from AS to unicast service and flow to the terminal and send, and possibly need in this process to divide to be used in the address of transmitting Business Stream and port etc.; AS provides professional to the user, carries out necessary service negotiation with the terminal, proposes the media resource request according to the result who consults to MRFC; MRFC receives the media resource request of AS and controls the distribution that MRFP carries out media resource, wherein possibly comprise resources such as distributing the multicast services addresses; MRFP provides group business stream to the terminal under the control of MRFC, the MRFP here is the multicast functionality supplier, is used to provide professional relevant group business stream.

See also Fig. 6, it is the multicast procedures sketch map of NGN network shown in Figure 5, and idiographic flow is:

S101. terminal originating service request (like SIP invite); Described request arrives proxy CSCF; Proxy CSCF (having the AF function) extracts the terminal and receives professional address and port (suppose that here the terminal carried said information in message, otherwise in follow-up negotiation packet, extract);

S102. described request is forwarded to serving CSCF by proxy CSCF;

S103. serving CSCF is triggered to said service request the AS that manages business;

S104. said service request needs media resource, so AS initiates the media resource request to MRFC;

S105.MRFC applies control according to the request of AS to MRFP, and supposition here need provide professional with the multicast mode, and therefore MRFP has confirmed the address of multicast service and returned to MRFC here;

S106.MRFC returns the result of media resource request to AS, and said result comprises a SDP and describes, and wherein carries multicast service address and port, and the address and the port that send the MRFP of multicast service;

S107.AS sends service response to serving CSCF, and said response comprises SDP to be described, and wherein carries multicast service address and port, and the address and the port that send the MRFP of multicast service;

S108. serving CSCF is transmitted said response to proxy CSCF;

S109. carry out the multicast control procedure, it further may further comprise the steps:

After s109.1 received above-mentioned response, proxy CSCF (having the AF function) extracted multicast service address and port, and the address and the port that send the MRFP of multicast service; Proxy CSCF possibly initiated the multicast control request to SPDF according to local policy subsequently, transmits so that group business stream can pass through BGF;

S109.2SPDF flows to the conversion of unicast service stream to BGF request carrying out multicast service; Be that BGF need set up multicast forwarding path with multicast routing protocol; BGF need distribute a clean culture UDP (UserDatagram Protocol, UDP) port numbers to be used for multicast data forwarding stream simultaneously; Consequently BGF prepares to receive the multicast traffic stream of MRFP; Be converted into unicast stream then and issue the terminal; The result of its conversion is: unicast service stream source address is the IP address of BGF; Source port is the udp port that it distributes, and destination address is the IP address at terminal, and destination interface is that the terminal receives professional port;

S109.3BGF is established to the multicast forwarding path of multicast source, its essence is to use multicast routing protocol (like PIM-SM) to be established to the multicast forwarding path of multicast source;

S109.4BGF carries out resource reservation request, to the SPDF feedback result, comprises the address and the port information that are used for unicast traffic stream among the said result;

S109.5SPDF comprises the address and the port information that are used for unicast traffic stream to the affirmation information of proxy CSCF feedback to resource reservation among the said result;

The s109.6 proxy CSCF need be revised the SDP information in the media consultation process according to this information: unicast service address and port so that BGF provides are replaced multicast service address and port description among the SDP; If desired, possibly also need replace source address and the port information that sends group business stream;

S110. proxy CSCF is to the final response results of terminal feedback;

S111-112. possibly have further media consultation process here, each negotiation packet is during through proxy CSCF, and proxy CSCF is revised in the negotiation packet corresponding media description information as required and consulted successfully guaranteeing; The conversion of BGF action just begins to carry out in the time of possibly only after all negotiations complete successfully, receiving further indication;

S113. the possibility of result of above-mentioned negotiation causes the further control of MRFC to MRFP.

Above-mentioned negotiation flow process is final accomplish after, Business Stream will send to BGF with the multicast mode, and BGF converts thereof into unicast service stream and sends to the terminal.

See also Fig. 7, it is that the second embodiment of the invention packet-broadcasting controlling system is applied in and adopts IMS as the concrete function Organization Chart in session control and the professional NGN network that network is provided.Said system comprises terminal, proxy CSCF, SPDF, BGF, Access-Resource and Admission Control Function, RCEF, serving CSCF, AS (being service supplier), MRFC and MRFP.Wherein: terminal and AS carry out service negotiation, and requested service the supplier provide multicast services; Proxy CSCF is transmitted request and the response message between terminal and the serving CSCF and has been comprised the function of AF; Serving CSCF is triggered to AS to business request information according to triggering rule, and message is carried out route; Proxy CSCF obtains the information of carrying out the multicast conversion in several ways, then asks SPDF to carry out the multicast conversion if need carry out the multicast conversion to Business Stream; SPDF receives the multicast conversion request of proxy CSCF (comprising the AF function) and carries out the strategy judgement and the resource inspection, whether allows to accomplish corresponding conversion with decision, if allow then to ask BGF to accomplish concrete multicast conversion operations; BGF is established to the multicast forwarding path of service supplier; Said SPDF sends request to Access-Resource and Admission Control Function, adds the new multicast group of being distributed by Access-Resource and Admission Control Function request RCEF, and RCEF accepts described request and uses multicast routing protocol to be established to the multicast forwarding path of BGF; Said BGF converts the group business stream that receives from service supplier to new multicast service and flows to the terminal and send, and possibly need in this process to divide to be used in the address of transmitting Business Stream and port etc.; AS provides professional to the user, carries out necessary service negotiation with the terminal, proposes the media resource request according to the result who consults to MRFC; MRFC receives the media resource request of AS, and controls MRFP and carry out the distribution of media resource, wherein possibly comprise resources such as distributing the multicast services addresses; MRFP provides group business stream to the terminal under the control of MRFC, the MRFP here is the multicast functionality supplier, is used to provide professional relevant group business stream.

See also Fig. 8, it is the multicast procedures sketch map of NGN network shown in Figure 7, and idiographic flow is:

S201. terminal originating service request (like SIP invite); Described request arrives proxy CSCF; Proxy CSCF (having the AF function) extracts the terminal and receives professional address and port (suppose that here the terminal carried said information in message, otherwise in follow-up negotiation packet, extract);

S202. said service request is forwarded to serving CSCF by proxy CSCF;

S203. serving CSCF is triggered to said service request the AS that manages business;

S204. said service request needs media resource, so AS initiates the media resource request to MRFC;

S205.MRFC applies control according to the request of AS to MRFP, and supposition here need provide professional with the multicast mode, and therefore MRFP has confirmed the address of multicast service and returned to MRFC here;

S206.MRFC returns the result of media resource request to AS, and said result comprises a SDP and describes, and wherein carries multicast service address and port, and the address and the port that send the MRFP of multicast service;

S207.AS sends service response to serving CSCF, and said response comprises SDP to be described, and wherein carries multicast service address and port, and the address and the port that send the MRFP of multicast service;

S208. serving CSCF is transmitted said service response to proxy CSCF;

S209. carry out the multicast control procedure, it further may further comprise the steps:

After s209.1 received above-mentioned response, proxy CSCF (having the AF function) extracted multicast service address and port, and the address and the port that send the MRFP of multicast service; Proxy CSCF possibly initiated the multicast control request to SPDF according to local policy subsequently, transmits so that group business stream can pass through BGF;

S209.2SPDF is to BGF request the carrying out conversion that multicast service flows to group business stream, and new multicast service address and port can be distributed by SPDF or BGF; Simultaneously BGF need distribute a clean culture udp port number to be used for multicast data forwarding stream; Consequently BGF prepares to receive the multicast traffic stream of MRFP; Be converted into new multicast data flow then and issue the terminal; The result of its conversion is: the group business stream source address is the IP address of BGF; Source port is the udp port that it distributes, and destination address is newly assigned multicast service address, and destination interface is newly assigned multicast service port;

S209.3BGF is established to the multicast forwarding path of multicast source, its essence is to use multicast routing protocol (like PIM-SM) to be established to the multicast forwarding path of multicast source, if the front has added said multicast group, then need not repeat here to add;

S209.4BGF carries out resource reservation request, to the SPDF feedback result, comprises the address and the port information that are used for unicast traffic stream among the said result; If new multicast service address and port are distributed by BGF, then also need carry newly assigned multicast service address and port here;

S209.5SPDF comprises the address and the port information that are used to send new group business stream to the affirmation information of proxy CSCF feedback to resource reservation among the said result, and new multicast service address and port information;

The s209.6 proxy CSCF need be revised the SDP information in the media consultation process according to this information: multicast service address and port with among new multicast service address and the port replacement SDP are described; If desired, possibly also need replace source address and the port information that sends group business stream;

S210. proxy CSCF is to the final response results of terminal feedback;

S211-212. possibly have further media consultation process here, each negotiation packet is during through proxy CSCF, and proxy CSCF is revised in the negotiation packet corresponding media description information as required and consulted successfully guaranteeing; The switching motion of BGF just begins to carry out in the time of possibly only after all negotiations complete successfully, receiving further indication;

S213. the possibility of result of above-mentioned negotiation causes the further control of MRFC to MRFP.

After the final completion of above-mentioned negotiation flow process, the terminal uses IGMP to require to add new multicast group, and described request is handled by RCEF; RCEF and then employing multicast routing protocol are established to the multicast forwarding road warp of BGF; After forward-path is set up, Business Stream will send to BGF with the multicast mode, and BGF converts thereof into new group business stream, and said Business Stream sends to the terminal through RCEF.

The above is merely preferred embodiment of the present invention, is not to be used to limit protection scope of the present invention, all any modifications of within spirit of the present invention and principle, being made, is equal to replacement, improvement etc., all should be included within protection scope of the present invention.

Claims

1. packet-broadcasting controlling system, it is characterized in that: it comprises terminal, application function AF module, the strategy decisive function SPDF module based on business, Border Gateway Function BGF module, service supplier and multicast functionality supplier, wherein,

2. the system of claim 1; It is characterized in that: when said system applies is adopting IP Multimedia System IMS as among session control and the professional next generation network NGN that network is provided the time, the AF module is Proxy Call Session Control Function CSCF, and service supplier is an application server AS; The multicast functionality supplier is Media Resource Function Processor MRFP; Said system also comprises serving CSCF and media resource function controller MRFC, wherein

Said proxy CSCF is transmitted request and the response message between terminal and the serving CSCF;

Said serving CSCF is triggered to AS to business request information according to triggering rule, and said business request information is carried out route; After said proxy CSCF obtains to carry out the information of multicast conversion, then ask the SPDF module to carry out the multicast conversion if need carry out the multicast conversion to Business Stream;

Said AS provides professional to the user, consults with terminal carrying out service, proposes the media resource request according to the result who consults to MRFC;

Said MRFC receives the media resource request of AS and controls the distribution that MRFP carries out media resource;

Said MRFP provides group business stream to the terminal under the control of MRFC.

3. the system of claim 1 is characterized in that: said BGF module support multicast/unicast conversion function.

4. the system of claim 1 is characterized in that: said BGF module is supported multicast routing protocol at the interface of core-network side.

5. the system of claim 1 is characterized in that: if the AF module is from consult signaling, to obtain multicase control information, then the AF module need be understood said signaling and can extract relevant information; The AF module need be revised the media description information in the signaling, to mate the control of being done.

6. packet-broadcasting controlling system; It is characterized in that: it comprises terminal, application function AF module, the strategy decisive function SPDF module based on business, Border Gateway Function BGF module, access-resource and permission control function Access-Resource and Admission Control Function, Resource Control Enforcement Function RCEF, service supplier and multicast functionality supplier; Wherein

Said BGF module is established to multicast functionality supplier's multicast forwarding path;

Said SPDF module is sent request to Access-Resource and Admission Control Function, adds the new multicast group of being distributed by Access-Resource and Admission Control Function request RCEF, and RCEF accepts described request and uses multicast routing protocol to be established to the multicast forwarding path of BGF module;

Said BGF module converts the group business stream that receives from the multicast functionality supplier to new multicast service and flows through the BGF module to RCEF, and RCEF sends to the terminal to the multicast forwarding path at terminal.

7. system as claimed in claim 6; It is characterized in that: when said system applies is adopting IP Multimedia System IMS as among session control and the professional next generation network NGN that network is provided the time, said AF module is Proxy Call Session Control Function CSCF, and said service supplier is an application server AS; Said multicast functionality supplier is Media Resource Function Processor MRFP; Said system also comprises serving CSCF and media resource function controller MRFC, wherein

Said proxy CSCF is transmitted request and the response message between terminal and the serving CSCF; And comprised the function of AF module; After said proxy CSCF obtains to carry out the information of multicast conversion, then ask the SPDF module to carry out the multicast conversion if need carry out the multicast conversion to Business Stream;

8. system as claimed in claim 6 is characterized in that: said BGF module is supported multicast routing protocol at the interface of core-network side, and said BGF module can only be sent new group business stream to user access networks one side.

9. system as claimed in claim 6 is characterized in that: said BGF module is supported multicast/multicast translation function.

10. system as claimed in claim 6 is characterized in that: if the AF module is from consult signaling, to obtain multicase control information, then the AF module need be understood said signaling and can extract relevant information; The AF module need be revised the media description information in the signaling, to mate the control of being done.

11. system as claimed in claim 6 is characterized in that: said RCEF supports multicast routing protocol.

12. a multicast control method is characterized in that may further comprise the steps:

A1. application function AF obtains the information that need carry out multicast control;

The A2.AF request is carried out multicast control based on the strategy decisive function SPDF of business, and after described request was handled by SPDF, SPDF further filed a request to Border Gateway Function BGF, and described request is handled by BGF;

A4.BGF responds to the AF feedback request through SPDF;

13. method as claimed in claim 12; It is characterized in that the mode that steps A 1 described AF obtains the information that need carry out multicast control is: terminal and multicast functionality supplier use signaling negotiation mechanism negotiation multicast service employed multicast service address and port; Said negotiation signaling is transmitted through AF, and then AF obtains carrying out the necessary information of multicast control through the business description information in the negotiation packet of checking.

14. method as claimed in claim 12; It is characterized in that the mode that steps A 1 described AF obtains the information that need carry out multicast control is: the multicast functionality supplier is after receiving the multicast service request that send at the terminal; To the control of AF request carrying out multicast, and the information that gives particulars.

15. method as claimed in claim 12 is characterized in that steps A 3 described multicast routing protocols are that Protocol Independent Multicast-sparse mode pim-SM, Protocol Independent Multicast Routing Protocol-dense mode PIM-DM, distance vector multicast routing protocol DVMRP or multicast shortest path are through priority protocol MOSPF.

16. method as claimed in claim 12 is characterized in that steps A 2 further may further comprise the steps:

S11.AF sends the multicast control request to SPDF, and described request carries the multicast service address and port, the address of sending multicast service and port, terminal receive the address of business and whole perhaps combinations of above-mentioned information of port information;

S12.SPDF constructs the request to BGF according to the request of AF, and request BGF multicasts to the conversion operations of clean culture; Described request is specifically handled by BGF, carries the address of multicast service address and port, the address of sending multicast service and port, terminal reception business and whole perhaps combinations of above-mentioned information of port information at least; BGF divides unicast address and the port that is used in the transmission Business Stream after receiving above-mentioned request.

17. method as claimed in claim 16; It is characterized in that step S12 is further comprising the steps of: if there are a plurality of users to ask same group business stream; Then BGF sets up relevant user list for each group business stream; This tabulation with user's unicast address and port as differentiation, if Add User, the corresponding list item of interpolation in table then; If the user withdraws from Business Stream, then from table, delete corresponding list item.

18. method as claimed in claim 16 is characterized in that steps A 4 further may further comprise the steps:

S14.BGF carries the unicast address and the port that are used to carry out professional forwarding that are distributed to the response of SPDF feedback request in the said feedback information;

S15.SPDF carries the unicast address and the port that are used to carry out professional forwarding that are distributed at least to the response of AF feedback request in the said feedback information.

19. method as claimed in claim 18; It is characterized in that between step S15 and the A5 further comprising the steps of: if AF is through analyzing the multicase control information that the service negotiation signaling obtains; Then it need revise the service address information of negotiation packet, sends the address so that the terminal obtains new business; Carry out multicast control if AF is the request of accepting other entity, then it need need carry professional forwarding address and the port that is distributed among the said result to said entity FEEDBACK CONTROL result.

20. method as claimed in claim 19; It is characterized in that conversion is to be Business Stream source address and port with own institute's addresses distributed and port to steps A 5 described BGF to multicast that Business Stream carried out; Receiving professional address and port with the terminal is Business Stream destination address and port, converts group business stream into unicast service stream.

21. method as claimed in claim 12 is characterized in that steps A 2 further may further comprise the steps:

S21.AF sends the multicast control request to SPDF, and described request carries the multicast service address and port, the address of sending multicast service and port, terminal receive the address of business and whole perhaps combinations of above-mentioned information of port information;

S22.SPDF constructs the request to BGF according to the request of AF, and request BGF multicasts to the conversion operations of multicast; Described request is specifically handled by BGF, carries the address of multicast service address and port, the address of sending multicast service and port, terminal reception business and whole perhaps combinations of above-mentioned information of port information at least; Can carry new multicast service address and port that SPDF distributes in the described request; If do not carry said information in the request; SPDF can specify by BGF and distribute; Also can be obtained to the request of multicast group management entity by BGF, BGF also divides unicast address and the port that is used in the transmission Business Stream in addition.

22. method as claimed in claim 21 is characterized in that steps A 4 further may further comprise the steps:

S24.BGF carries the unicast address and port and new multicast service address and the port that are used to carry out professional forwarding that are distributed to the response of SPDF feedback request in the said feedback information;

S25.SPDF carries the unicast address and port and new multicast service address and the port that are used to carry out professional forwarding that are distributed to the response of AF feedback request in the said feedback information.

23. method as claimed in claim 22; It is characterized in that between step S25 and the A5 further comprising the steps of: if AF is through analyzing the multicase control information that the service negotiation signaling obtains; Then it need revise the service address information of negotiation packet, sends the address so that the terminal obtains new business; Carry out multicast control if AF is the request of accepting other entity, then it need need carry the professional forwarding address and port and new multicast service address and the port that are distributed to said entity FEEDBACK CONTROL result among the said result.

24. method as claimed in claim 18; It is characterized in that steps A 3 is further comprising the steps of: set up the multicast forwarding path from RCEF to BGF; Said method for building up is: the user uses the IGMP protocol requirement to add said multicast group; Described request is handled by Resource Control Enforcement Function RCEF, and RCEF uses multicast routing protocol to be established to the multicast forwarding path of BGF.

25. method as claimed in claim 18; It is characterized in that steps A 3 is further comprising the steps of: set up multicast forwarding path from Resource Control Enforcement Function RCEF to BGF; Said method for building up is: SPDF sends request to access-resource and permission control function Access-Resource and Admission Control Function; Add the new multicast group of being distributed by Access-Resource and Admission Control Function request RCEF, RCEF accepts described request and uses multicast routing protocol to be established to the multicast forwarding path of BGF.

26. method as claimed in claim 12; It is characterized in that conversion is to be Business Stream source address and port with own institute's addresses distributed and port to steps A 5 described BGF to multicast that Business Stream carried out, is that Business Stream destination address and port convert group business stream into new group business stream and transmit with new multicast service address and port.

27. method as claimed in claim 12 is characterized in that: adopt IP Multimedia System IMS as among session control and the professional next generation network NGN that network is provided the time when said method is applied in, said AF is Proxy Call Session Control Function CSCF.

28. method as claimed in claim 27 is characterized in that: steps A 1 further may further comprise the steps:

S101. terminal originating service request, described request arrives proxy CSCF, and proxy CSCF extracts the terminal and receives professional address and port;

S102. described request is forwarded to serving CSCF by proxy CSCF;

S103. serving CSCF is triggered to said service request the application server AS of managing business;

S104. said service request needs media resource, so AS initiates the media resource request to media resource function controller MRFC;

S105.MRFC applies control according to the request of AS to Media Resource Function Processor MRFP, and under the situation that business need be provided with the multicast mode, said MRFP confirms the address of multicast service and returns to MRFC;

S106.MRFC returns the result of media resource request to AS, and said result comprises a Session Description Protocol SDP and describes, and wherein carries multicast service address and port, and the address and the port that send the MRFP of multicast service;

S108. serving CSCF is transmitted said response to proxy CSCF.

29. method as claimed in claim 28 is characterized in that: steps A 2 further may further comprise the steps:

S109.1 receives said AS after the service response that serving CSCF sends, and proxy CSCF extracts multicast service address and port, and the address and the port that send the MRFP of multicast service; Proxy CSCF is initiated the multicast control request according to local policy to SPDF subsequently;

S109.2SPDF carries out the conversion that multicast service flows to unicast service stream to BGF request, and BGF distributes a unicast user datagram protocol udp port number to be used for multicast data forwarding stream simultaneously.

30. method as claimed in claim 29 is characterized in that: steps A 4 further may further comprise the steps:

S109.5SPDF comprises the address and the port information that are used for unicast traffic stream to the affirmation information of proxy CSCF feedback to resource reservation among the said result.

31. method as claimed in claim 30; It is characterized in that also comprising between step S109.5 and the A5 step s109.6, promptly proxy CSCF need be revised the SDP information in the media consultation process according to this information: unicast service address and port so that BGF provides are replaced multicast service address and port description among the SDP; If desired, then also need replace source address and the port information that sends group business stream.

32. method as claimed in claim 31; It is characterized in that steps A 5 described BGF to the result of the multicast conversion that Business Stream carried out are: unicast service stream source address is the IP address of BGF; Source port is the udp port that it distributes; Destination address is the IP address at terminal, and destination interface is the professional receiving port at terminal.

33. method as claimed in claim 28 is characterized in that: steps A 2 further may further comprise the steps:

After s209.1 received above-mentioned response, proxy CSCF extracted multicast service address and port, and the address and the port that send the MRFP of multicast service; Proxy CSCF is initiated the multicast control request according to local policy to SPDF subsequently;

S209.2SPDF is to BGF request the carrying out conversion that multicast service flows to group business stream, and new multicast service address and port are distributed by SPDF or BGF; Simultaneously BGF need distribute a clean culture udp port number to be used for multicast data forwarding stream.

34. method as claimed in claim 33 is characterized in that: steps A 4 further may further comprise the steps:

S209.5SPDF comprises the address and the port information that are used to send new group business stream to the affirmation information of proxy CSCF feedback to resource reservation among the said result, and new multicast service address and port information.

35. method as claimed in claim 34 is characterized in that also comprising between step S209.5 and the A5 step

The s209.6 proxy CSCF need be revised the SDP information in the media consultation process according to said confirmation: multicast service address and port with among new multicast service address and the port replacement SDP are described; If desired, then also need replace source address and the port information that sends group business stream.

36. method as claimed in claim 35; It is characterized in that steps A 5 described BGF to the result of the multicast conversion that Business Stream carried out are: the group business stream source address is the IP address of BGF; Source port is the udp port that it distributes; Destination address is newly assigned multicast service address, and destination interface is newly assigned multicast service port.