CN101662654A

CN101662654A - Wed TV system based on IMS and method and device for realizing system

Info

Publication number: CN101662654A
Application number: CN200810147292A
Authority: CN
Inventors: 严军; 吴向阳
Original assignee: Huawei Technologies Co Ltd
Current assignee: Huawei Technologies Co Ltd
Priority date: 2008-08-26
Filing date: 2008-08-26
Publication date: 2010-03-03

Abstract

The invention discloses a method for realizing a web TV based on an IP multimedia subsystem, which comprises the following steps: receiving an IPTV service request sent by user equipment UE through anIMS network; selecting a media node MS which can provide service to the UE; sending a content request to the media node, wherein the content request contains content identification corresponding to the request content of the UE; acquiring missing content in a peer-to-peer way and providing the content requested to the UE by the media node. The invention also discloses system and device of a web TV based on the IP multimedia subsystem. The invention carries out content net structure among MS by the P2P technology and saves cost of investment on the IPTV system.

Description

Based on the network television system of IMS and the implementation method and the device of this system

Technical field

The present invention relates to communication technical field, particularly based on Web TV (IPTV, the IP TeleVision) system of IP Multimedia System (IMS, IPMultimedia Subsystem) and the implementation method and the device of this system.

Background technology

Streaming media service or IPTV business are a kind of new business that developed rapidly in recent years, and streaming media service utilization stream transmission technology is transmitted multimedia file on packet network, comprise file contents such as video, audio frequency.These contents need not just to download fully and can play immediately when visit.The key technology that Streaming Media is realized is transmitted technology exactly as a stream, and the stream transmission technology is that continuous video and audio-frequency information are put server after treatment, allow the user watch, to listen to, and whole file such as do not need to download to the network transmission technology that just can watch behind the own machine while downloading.

IP Multimedia System (IMS, IP Multimedia Subsystem) is the subsystem that multimedia service is provided that 3GPP R5 proposes, it comprises CSCF (CSCF, Call SessionControl Function), MGCF (MGCF, Media Gateway ControlFunction), source of media function (MRF, Media Resource Function) functional entity such as, main conversation initialized protocol (the SIP that adopts, Session Initiation Protocol), Diameter, belong to the upper strata control subsystem, irrelevant with concrete access technology, be the ideal scheme and the developing direction that move fixing fusion that industry is generally admitted.

IPTV (IMS based IPTV) based on IMS is exactly to provide IPTV business under the overall architecture of IMS, is that the user provides streaming media service and merges Streaming Media and the multimedia service of real-time session business to make full use of that mechanism such as existing registration, authentication, route, session control and foundation in the IMS network, professional triggering, charging, end-to-end QoS assurance come.That is to say that the user is to finish by the existing session control mechanism of IMS to the Multimedia session of content, in setting up conversation procedure, need reserve bearing resource for the transmission of Media Stream.At present based on the IPTV framework of IMS in each big normal structure, as telecommunications and the Internet converged services and high-level network protocol (TISPAN, TelecommunicationsandInternetConverged Services and Protocols for AdvancedNetworking), International Telecommunications Union's telecommunication standards group (ITU-T for ITUTelecommunication Standardization Sector), open network television standard forum (OpenIPTV Forum) etc. all obtained approval, its standard evolution is rapid.

Referring to Fig. 1, it is the IPTV framework of TISPAN based on the IMS definition.Comprise user terminal (UE) among the figure, use and IPTV business function (Application and IPTV Service Functions), core IMS, transfer function (Transport Functions), and media delivery, distribution and storage (MediaDelivery Distribution ﹠amp; Storage) these several parts.

User terminal (UE, user equipment) is used for IPTV service request and content demonstration etc.

Comprise again among the Application and IPTV Service Functions:

Service selection functional (SSF, Service Selection Function) is used to the business information that provides available, users' guidebook or service metadata etc.;

Service discovering function (SDF, Service Discovery Function) can produce and provide business to adhere to information, can provide personalized discovery information to terminal;

The user describes business function (UPSF, User Profile Server Function), is used to store the professional relevant user data with IPTV;

IPTV service control function (SCF, Service Control Functions) is carried out the professional required service logic of different IP TV, and actual is exactly sip application server (AS).

Core IMS (Core IMS) is used for business checking, mandate, the signalling interactive process of professional foundation of IPTV and content delivery process, signaling is carried out route or carried out the business triggering, can also carry out the reservation of professional resource requirement with Resource and Admission Control Sub-system (RACS) alternately simultaneously.

Comprise again among the Transport Functions:

Network Attachment Subsystem (NASS, Network Attachment Subsystem) is used to provide user terminal to adhere to and access control function etc.;

Resource and Admission Control Sub-system (RACS, Resource and Admission ControlSubsystem), be used to control/authorization terminal is to the use of Internet resources;

Transmission process function (TPF, Transport Processing Function) is used to provide the network transmission function on basis, comprises access link and IP transmission network etc.

Media Delivery Distribution ﹠amp; Comprise again among the Storage:

IPTV media function (MF, Media Function), for the user provides content, it further is divided into media control function (Media Control Function) and media delivery function (MediaDelivery Function) in standard, and the former controls the latter and carries out content delivery.

More than explanation is with reference to existing TIPSAN IMS-based IPTV standard ETSI TS 182 027V2.0.0, and interface repeats no more.

In Open IPTV forum standard, the content delivery/distributing network that is adopted (CDN, ContentDelivery/Distribution Network) is as Fig. 2.Wherein,

Cluster controller (CC, Cluster Controller) is used to control a plurality of content delivery functions (CDF, Content Delivery Function) and carries out content and provide;

CDF has content stores and content delivery ability, can pay content to terminal under CC control;

Content delivery network controller (CDNC, Content Delivery Network Controller) is used for the content route, can select appropriate C C and CDF to provide content to user terminal in business procedure;

The relation of a plurality of CDNC and IPTV control provides as shown in Figure 3.In Open IPTVforum standard, IPTV control is responsible for the basic service request and handles, the CC and the CDF that can use for service selection to the CDNC request, and it is equivalent to the SCF in the TISPAN standard.

Traditional IPTV is when the user provides content, adopt customer end/server mode mostly, even adopt the CDN mode that content is provided, its content supplies a pattern and essence does not still take place changes, just with the decentralized layout of server and optimized flow between the client and server.In this type systematic, have considerable repetition between the server; In addition, existing CDN generally adopts layering, and promptly content is distributed to subordinate's server step by step by central server, like this to central server and higher leveled relatively server, it need bear the content requests of next stage server, very likely becomes the bottleneck of system.Along with the expansion of IPTV userbase, the number of users of present single IPTV system service will be above 1,000,000 even ten million, and this CDN for hierarchy has formed great challenge.Along with the pressure of its higher level's server of expansion of network size increases, need constantly carry out dilatation and upgrading could be tackled new traffic demand, certainly will bring the cost increase to operator.

Summary of the invention

It is a kind of based on the network television system of IMS and the implementation method and the device of this system that the purpose of the embodiment of the invention is to provide, to reduce the cost of investment of content net.

The embodiment of the invention provides a kind of implementation method based on the IP Multimedia System Web TV, comprising:

Receive the network TV IPTV service request that user equipment UE through anIMS network sends;

Selection can provide the media node MS of service to UE; Send content requests to described media node, comprise described UE institute request content corresponding content sign in the described content requests; Described media node obtains the content of disappearance with Peer, and provides the content of being asked to described UE.

The embodiment of the invention also provides a kind of network television system based on IP Multimedia System, comprising:

User terminal is used for initiating the IPTV service request by the IMS network;

Application server is used for receiving described IPTV service request by the IMS network, by the IMS network described request is sent to MDDCF according to service logic;

MDDCF is used for selecting media node MS according to described request; Send content requests to described media node, comprise described UE institute request content corresponding content sign in the described content requests;

Media node obtains the content of disappearance with Peer, and provides the content of being asked to described UE.

The embodiment of the invention also provides a kind of MDDCF, comprising:

Receiving element receives the IPTV service request of sending by the IMS network;

Selected cell, selection can provide the media node MS of service to UE;

Transmitting element is used for sending content requests to described selected media node, comprises UE institute request content corresponding content sign in the described content requests.

The embodiment of the invention also provides a kind of media node, comprising:

Receiving element is used for the received content request, comprises the descriptor of UE institute request content corresponding content sign and media node in the described content requests; Described descriptor comprises: have the descriptor of the media node of full content that user terminal is asked, or have the descriptor of the media node of user terminal institute request content start-up portion;

Acquiring unit is used for the descriptor according to described content requests, with the content of Peer request disappearance;

Content providing unit is used for providing the content of being asked for user terminal by the IMS network.

Use the present invention, adopt the P2P technology to carry out the content network structure between MS, P2P is progressively ripe on the technological means, and has obtained good application on the internet.Share alternately by means of the P2P content between MS, can effectively alleviate disposal ability, bandwidth equal pressure that server faces; Can effectively be reduced in the performance requirement of the media server that is used to provide media content in the IPTV business, thereby reduce the content node cost based on the IPTV of IMS, be that operator saves IPTV system cost of investment.

Description of drawings

In order to be illustrated more clearly in the embodiment of the invention or technical scheme of the prior art, to do to introduce simply to the accompanying drawing of required use in embodiment or the description of the Prior Art below, apparently, accompanying drawing in describing below only is some embodiments of the present invention, for those of ordinary skills, under the prerequisite of not paying creative work, can also obtain other accompanying drawing according to these accompanying drawings.

Fig. 1 is the IPTV framework of TISPAN based on the IMS definition;

Fig. 2 is the CDN that is adopted in the Open IPTV forum standard;

Fig. 3 is the schematic diagram that concerns of a plurality of CDNC and IPTV control;

Fig. 4 is the logical construction schematic diagram based on the IPTV system of IMS according to the embodiment of the invention;

Fig. 5 is the deployment schematic diagram based on the IPTV system of IMS according to the embodiment of the invention;

Fig. 6 is the schematic flow sheet that carries out the content distribution according to the embodiment of the invention;

Fig. 7 realizes concrete professional flow chart according to one embodiment of the invention;

Fig. 8 realizes concrete professional flow chart according to another embodiment of the present invention;

Fig. 9 is the MDDCF structural representation according to the embodiment of the invention;

Figure 10 is the MS structural representation according to the embodiment of the invention.

Embodiment

Below in conjunction with the accompanying drawing in the embodiment of the invention, the technical scheme in the embodiment of the invention is clearly and completely described, obviously, described embodiment only is the present invention's part embodiment, rather than whole embodiment.Based on the embodiment among the present invention, those of ordinary skills belong to the scope of protection of the invention not making the every other embodiment that is obtained under the creative work prerequisite.

Referring to Fig. 4, it is the logical construction schematic diagram based on the IPTV system of IMS according to the embodiment of the invention.Wherein, UE 401, IMS network (IMScore) 402, application server (AS) the 403rd, the existing capability in the defined IMS of the 3GPP system, wherein the SCF among the TISPAN IMS IPTV is exactly the AS here, and the IPTV control in the Open IPTV forum IPTV framework also is equivalent to the AS here.

Media node (MS, MediaStation) 405, have media store and pay function, in this system,, can pass through p2p agreement and other MS interaction content as the node in equity (P2P, peer to peer) network; Simultaneously, its can with distribution of media function of interaction control (MDDCF, MediaDistribution and Delivery Control Function) mutual resource and state information are comprising reporting by the mutual content information that obtains of P2P to MDDCF.

MF in the TISPAN framework (specifically being divided into MCF and MDF) can realize the function of MS here, thereby as a P2P node.CC in the Open IPTV forum framework and CDF can realize the MS function here, thereby from logic as a P2P node.

MDDCF 404: have content distribution controlled function, it can be controlled and use P2P mechanism to carry out the content distribution between MS; Have the payment controlled function, in business procedure, be used to select suitable MS to provide content to UE.For the TISPAN framework, the function of this MDDCF 404 can be used as independent entity, also can be realized by MF, specifically is exactly to be realized by MCF; For Open IPTV forum framework, the function of this MDDCF 404 can be realized by CDNC.

Below the interface among Fig. 4 is described:

ISC, Gm are the existing interface in the defined IMS of the 3GPP system.

Interface between I1:IMScore and the MDDCF, IMScore transmits content requests by this interface, and request MDDCF selects a MS to be used for providing content to UE.Agreement can adopt realizations such as SIP, RTSP.

Interface between I2:MDDCF and the MS, MDDCF is by carrying out the content distribution of P2P mode between this interface control MS; MS and MDDCF use this interactive interfacing resource and state information; In addition, MDDCF also uses this interface requests MS to provide content to UE.Agreement can adopt realizations such as SIP, RTSP.

Interface between I3:IMScore and the MS, this interface are used for direct Signalling exchange between IMScore and the MS; IMScore can directly send content requests to MS by this interface.This interface adopts SIP to realize.

I4, the interface between the MS, this interface are used to carry out internodal signaling of P2P and data interaction, and concrete agreement depends on the P2P mechanism of employing, in the embodiment of the invention concrete P2P mechanism is not limited.

For to the further clear explanation of above-mentioned logical construction, provide one as Fig. 5 and dispose schematic diagram.Referring to Fig. 5, UE presses a plurality of logic regions of the different formation of Access Network, forms the P2P network between the MS, and content can be distributed between MS under MDDCF control; In business procedure, can be between the MS from the content of other MS request disappearance, mutual along with content carries out the mutual of resource and state information between MDDCF and the MS, and wherein MS can report self content change to MDDCF.Dotted line among Fig. 5 is represented content exchange, and chain-dotted line is represented the mutual of resource and state information.

Need to prove that Fig. 5 only is one and disposes schematic diagram that having omitted some does not influence the connection of invention thought; The actual deployment situation should satisfy logical construction shown in Figure 4.

Referring to Fig. 4 and Fig. 5, the present invention is from comprising the following aspects in logic:

One, the content distribution before business is carried out

Carry out the content distribution by P2P mechanism, and MDDCF collects the distribution of content information of MS:

In the content distribution phase, the descriptor (comprising seed file or positional information) that MDDCF will describe content to be distributed sends to the MS that need obtain content, indicates it to adopt P2P mechanism to begin to obtain content; Generally have a plurality of MS this moment and participate in the content distribution, the peer node of same content is obtained in conduct between them.Here for adopting which kind of P2P mechanism not have specific (special) requirements between the MS.

In the content distribution procedure or after content distribution finishes, exchange resource and state information between MS and the MDDCF:

For the P2P of distributed hashtable (DHT, Distributed Hash Table) mechanism, MS after obtaining burst to the distributed intelligence of MDDCF content of announcement; This distribution of content information comprises＜cid, hash-info=xxx, pi-index=p0-pn, hash-list, p-id, ip, port〉etc., wherein cid is content identification, and hash-info is the cryptographic Hash of the content of obtaining, and pi-index is the index of content fragment, hash-list is the Hash check value of corresponding burst index, p-id is the peer node sign of node, and ip is the address of node, and port is that node is used for the mutual port of p2p.Should be pointed out that above-mentioned information may be different for different P2P agreements.

For the P2P network with center LIST SERVER, MDDCF is as LIST SERVER, and it can collect the distribution situation of content on the MS in the content distribution procedure, thereby also can have the foregoing distributed intelligence.

By said process, the last distribution of content information that just can obtain on the MS of MDDCF.

Two, carry out in the business procedure

At first UE sends the IPTV service request by IMS, and required content is specified in this request, promptly comprises CID in this request;

Above-mentioned IP TV service request is triggered to by existing IPTV service mechanism based on IMS and is used for professional AS, and AS sends to MDDCF according to service logic with described IPTV service request, and the MS of content can be provided for UE by its selection; There are two kinds of situations this moment:

A, MDDCF select MS1 based on the UE positional information:

If MS1 this moment goes up existing institute request content, then MDDCF can directly send content requests, need not handle especially;

As if the content that does not have on the MS1 to be asked, then MDDCF carries the descriptor of the MS2 with institute's request content to MS1, descriptor MS1 can obtain required content fast from MS2 in view of the above, this information can comprise { MS2＜cid, hash-info, p-id, pi-index=px-py, ip, port〉etc., the explanation of corresponding information and aforementioned same; Can optionally carry simultaneously the seed information of content and give MS1, as provide the URL of seed information, MS1 can download seed file in view of the above and carry out obtaining of the required content of follow-up business;

If the partial content of request to some extent on the MS1, and this partial content is non-start-up portion, and when then carrying out media negotiation by IMScore between MS1 and AS, the UE, MS1 asks the start-up portion of institute's request content from MS2; In this simultaneously, MS1 can be by the follow-up required content of P2P mechanism inquiry the obtaining of its required content of Xingqi of going forward side by side in advance;

B, MDDCF select MS2 based on institute's content information:

The existing initial content of MS2 this moment can be used for providing to UE; When carrying out media negotiation by IMScore between MS2 and AS, UE, MS2 is by p2p mechanism inquiry subsequent content and obtain in advance;

After finishing media negotiation, selected MS and UE provide content to it.

Referring to Fig. 4 and Fig. 5, a kind of IPTV system based on IMS that the embodiment of the invention provides comprises:

User terminal 401 is used for initiating the IPTV service request by IMS network 402;

Application server 403 is used for receiving described IPTV service request by IMS network 402, by the IMS network described request is sent to MDDCF 404 according to service logic;

MDDCF 404, are used for selecting media node (MS) according to described request; Send content requests to described media node, comprise described UE institute request content corresponding content sign in the described content requests;

Media node 405 with the content of Peer from other media node request disappearance, and provides the content of being asked to described UE 401.

The content of above-mentioned disappearance comprises: all the elements that described UE asked or partial content, and this partial content is the start-up portion of user terminal institute request content.

The descriptor that comprises other media nodes in the foregoing request; Described descriptor comprises: have the descriptor of the media node of full content that user terminal is asked, or have the descriptor of the media node of user terminal institute request content start-up portion.

Above-mentioned MDDCF 404 also is used for the descriptor of content to be distributed is sent to the media node that need obtain content, indicates described media node to adopt reciprocity mechanism to obtain needed content; Obtain the distribution of content information of media node.

Above-mentioned media node 405 also is used for inquiring about and obtain subsequent content by equity mechanism from other media nodes.

Above-mentioned application server is the SCF in the TISPAN IMS IPTV framework, or the IPTV control in the Open IPTV forumIPTV framework; Above-mentioned media node is the media function MF in the TISPAN IMS IPTV framework, or CC and CDF in the Open IPTV forum framework; Above-mentioned MDDCF is an independent entity, or the MCF in the TISPAN IMS IPTV framework, or the CDNC of Open IPTV forum framework.

As seen, owing between MS, adopt the P2P technology to carry out the content network structure, can effectively be reduced in the performance requirement of the media server that is used to provide media content in the IPTV business, thereby reduce content node cost based on the IPTV of IMS.

Below in conjunction with flow chart the present invention is elaborated again.

Referring to Fig. 6, it is the schematic flow sheet that carries out the content distribution according to the embodiment of the invention.Solid line is represented signaling among the figure, dotted line presentation medium data.

Step 1, described MDDCF sends to the media node that need obtain content with the descriptor of content to be distributed, indicates described media node to adopt reciprocity mechanism to obtain needed content.Concrete, MDDCF sends content distribution indication to MS, wherein can carry the descriptor of content to be distributed, for the P2P ways of distribution, here can be the seed file of content to be distributed, the perhaps positional information of relevant information be as the URL(uniform resource locator) (URL) at seed place;

Step 2, MS etc. adopt P2P mechanism to obtain content from content source (contentSource), also carry out the shared distribution of content between the MS when obtaining content alternately.Here the P2P mechanism that is adopted is not limited.

Step 3, MDDCF obtains the distribution of content information of described media node.Concrete, between MS and contentSource, carry out in the content distribution procedure of P2P mechanism or the content distribution mutual after, MS notifies the current distribution of content information that self is had to MDDCF, specifically comprises as notice＜cid hash-info=xxx, pi-index=p0-pn, hash-list, p-id, ip, port〉etc. information, concrete implication is as hereinbefore.

Described herein is the P2P content exchange of content distribution procedure, be the process of MS before UE provides content, in the practical application, provide in the process of content to UE at MS, if the partial content that only has UE on the MS and asked or do not have content, also can adopt step 2 described here between the MS, 3 carry out obtaining of content.Specifically state embodiment as follows.

Referring to Fig. 7, it is to realize concrete professional flow chart according to one embodiment of the invention.MDDCF is defined as the MS that UE provides content according to the position of UE in this example; Chain-dotted line presentation medium data among the figure, dotted line is represented optional step, solid line is represented signaling; Specifically describe as follows:

Step 0 before UE initiates service request, may be carried out content exchange because serving other user between the MS, and the distribution of content report information of content change is given MDDCF; This distribution of content information can comprise＜cid, hash-info=xxx, pi-index=p0-pn, hash-list, p-id, ip, port〉in each or combination in any, can also comprise other information;

Step 1, UE initiates service request, and request provides content service, comprising the content identification of being asked, optionally carries the UE positional information; This request sends to AS through IMScore, if do not have the UE positional information in the request of UE, IMScore adds the UE positional information in request;

Step 2, AS sends content requests according to service logic to MDDCF, and request MDDCF determines to provide the MS of institute's request content; Carry content identification in the request;

Step 3, MDDCF receives the IPTV service request comprise CID, and being defined as UE according to the UE position, the first media node MS of content is provided is MS1, and MS1 may have institute's request content here, also may not have institute's request content:

Step 4,

If there has been the content of described CID correspondence among the MS1 that determines, then MDDCF sends content requests to MS1, comprises in this request that UE is required to obtain the pairing content identification of content;

If there is not the content of described CID correspondence among the MS1 that determines, then MDDCF inquires about the MS with institute's request content from self, as determining that second media node is MS2; The pairing content identification of indication UE institute's acquisition request content in sending to the content requests of MS1, the descriptor of carrying MS2 simultaneously; The descriptor of entrained description content that MS2 has can comprise: MS2＜cid, hash-info, p-id, pi-index=px-py, ip, port〉} etc.;

Step 5, if there is the partial content of described CID correspondence among the MS1 that determines, and when this partial content is not the start-up portion of user terminal institute request content, after MS1 receives the information of describing MS2, adopt P2P mechanism preferentially to obtain initial content from the MS2 that MDDCF indicates;

Step 6 is asked in the initial content obtaining, and MS1 can adopt P2P mechanism to carry out obtaining in advance of follow-up required content; For the P2P network with LIST SERVER type, MS1 can carry out the inquiry of subsequent content position from LIST SERVER; For the P2P network of DHT mode, MS1 can carry out the distributed content position enquiring and obtain according to the specified mechanism of P2P agreement that adopts.

Annotate: the step 5 here, 6 and follow-up step 7-10 can carry out synchronously;

Step 7, MS1 sends content request responses to MDDCF; Wherein carry the media description information of MS1;

Step 8, MDDCF sends content request responses to AS; Wherein carry the media description information of MS1;

Step 9, AS sends the service request response by IMScore to UE, wherein carries the media description information of the MS1 that content can be provided;

Step 10 can be carried out more Signalling exchange to finish media negotiation by IMScore between UE and the MS1;

After finishing media negotiation, MS1 sends the content of being asked to UE; When content sent, the MS1 6 described mechanism of can also taking steps were proceeded obtaining of follow-up required content.

Referring to Fig. 8, it is to realize concrete professional flow chart according to another embodiment of the present invention.MDDCF is defined as the MS that UE provides content according to the content that UE asked in this example; Chain-dotted line presentation medium data among the figure, dotted line is represented optional step, solid line is represented signaling; Specifically describe as follows:

Step 0-step 2, same with step 0-2 embodiment illustrated in fig. 7;

Step 3, herein, MDDCF is according to the distribution of content situation on the MS that self grasps, and the content of whether asking to some extent according to MS is defined as the MS that UE provides content; As determining that MS2 provides content;

Step 4, MDDCF sends content requests to selected MS2;

Step 5, MS2 can adopt P2P mechanism to carry out obtaining in advance of follow-up required content; This is identical with step 6 embodiment illustrated in fig. 7; Annotate, this step and following step 6-9 can carry out synchronously;

Step 6, MS2 sends content request responses to MDDCF, wherein carries the media description information of MS2;

Step 7-step 9, basic identical with step 8-10 embodiment illustrated in fig. 7, difference is that what carry in this example is the media description information of MS2 herein.

The embodiment of the invention also provides a kind of MDDCF, and referring to Fig. 9, it comprises:

Receiving element 901 receives the IPTV service request of sending by the IMS network;

Selected cell 902, selection can provide the media node MS of service to UE;

Transmitting element 903 is used for sending content requests to described selected media node, comprises UE institute request content corresponding content sign in the described content requests.

Above-mentioned MDDCF can also comprise:

Dispatching Unit 904 is used for the descriptor of content to be distributed is sent to the media node that need obtain content, indicates described media node to adopt reciprocity mechanism to obtain needed content;

Described receiving element 901 also is used to obtain the distribution of content information of described media node.

The embodiment of the invention also provides a kind of media node, referring to Figure 10, comprising:

Receiving element 1001 is used for the received content request, comprises the descriptor of UE institute request content corresponding content sign and other media nodes in the described content requests; Described descriptor comprises: have the descriptor of the media node of full content that user terminal is asked, or have the descriptor of the media node of user terminal institute request content start-up portion;

Acquiring unit 1002 is used for the descriptor according to described content requests, with the content of Peer from other media node request disappearance;

Content providing unit 1003 is used for providing the content of being asked for user terminal by the IMS network.

One of ordinary skill in the art will appreciate that all or part of step that realizes in the said method execution mode is to instruct relevant hardware to finish by program, described program can be stored in the computer read/write memory medium, here the alleged storage medium that gets, as: ROM/RAM, magnetic disc, CD etc.

The above is preferred embodiment of the present invention only, is not to be used to limit protection scope of the present invention.All any modifications of being done within the spirit and principles in the present invention, be equal to replacement, improvement etc., all be included in protection scope of the present invention.

Claims

1, a kind of implementation method based on the IP Multimedia System Web TV is characterized in that, comprising:

2, method according to claim 1 is characterized in that, selects the described media node MS that service can be provided to UE according to the positional information of described UE;

The content of described disappearance comprises: all the elements that described UE asked or partial content, and this partial content is the start-up portion of user terminal institute request content;

The descriptor that comprises media node in the described content requests; Described descriptor comprises: have the descriptor of the media node of full content that user terminal is asked, or have the descriptor of the media node of user terminal institute request content start-up portion;

Described media node comprises with the content that Peer obtains disappearance:

Described selected media node obtains the content of disappearance according to described descriptor by equity mechanism.

3, method according to claim 1 is characterized in that, the initial part that whether has UE institute request content according to MS is selected the described media node MS that service can be provided to UE.

4, method according to claim 1 is characterized in that, receives described IPTV service request, and carry out to select the entity of media node MS be MDDCF,

Receive before the described IPTV service request, further comprise:

Described MDDCF sends to the media node that need obtain content with the descriptor of content to be distributed, indicates described media node to adopt reciprocity mechanism to obtain needed content; Obtain the distribution of content information of described media node.

5, method according to claim 4, it is characterized in that, described distribution of content information comprises or multinomial combination of following information at least: content identification, the cryptographic Hash of content, the index of content fragment, the Hash check value of burst index, peer node sign, the address is used for the mutual port of equity.

6, method according to claim 1 is characterized in that, further comprises: described medium joint is when described UE provides the institute request content or before, described media node is by the inquiry of equity mechanism and obtain follow-up required content.

7, a kind of network television system based on IP Multimedia System is characterized in that, comprising:

8, system according to claim 7 is characterized in that, described system also comprises application server, is used for receiving described IPTV service request by the IMS network, by the IMS network described request is sent to MDDCF according to service logic.

9, system according to claim 6 is characterized in that,

The descriptor that comprises media node in the described content requests; Described descriptor comprises: have the descriptor of the media node of full content that user terminal is asked, or have the descriptor of the media node of user terminal institute request content start-up portion.

10, system according to claim 6 is characterized in that, described MDDCF also is used for the descriptor of content to be distributed is sent to the media node that need obtain content, indicates described media node to adopt reciprocity mechanism to obtain needed content; Obtain the distribution of content information of media node.

11, system according to claim 6 is characterized in that, described media node also is used for inquiring about and obtain follow-up required content by equity mechanism.

12, system according to claim 6 is characterized in that,

Described application server is the SCF in the TISPAN IMS IPTV framework, or the IPTV control in the Open IPTV forumIPTV framework;

Described media node is the media function MF in the TISPAN IMS IPTV framework, or CC and CDF in the Open IPTVforum framework;

Described MDDCF is an independent entity, or the MCF in the TISPAN IMS IPTV framework, or the CDNC of Open IPTV forum framework.

13, a kind of MDDCF is characterized in that, comprising:

Selected cell, selection can provide the media node MS of service to UE;

14, MDDCF according to claim 13 is characterized in that, also comprises:

Dispatching Unit is used for the descriptor of content to be distributed is sent to the media node that need obtain content, indicates described media node to adopt reciprocity mechanism to obtain needed content;

Described receiving element also is used to obtain the distribution of content information of described media node.

15, a kind of media node is characterized in that, comprising: