CN101415250B - Method, system and entity for establishing session in IP internet television system - Google Patents

Method, system and entity for establishing session in IP internet television system Download PDF

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Publication number
CN101415250B
CN101415250B CN200710181821.XA CN200710181821A CN101415250B CN 101415250 B CN101415250 B CN 101415250B CN 200710181821 A CN200710181821 A CN 200710181821A CN 101415250 B CN101415250 B CN 101415250B
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media
control channel
parameter information
function entity
positioning function
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CN101415250A (en
Inventor
李金成
李幼颖
王丰
严军
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Huawei Technologies Co Ltd
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Huawei Technologies Co Ltd
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Priority to CN200710181821.XA priority Critical patent/CN101415250B/en
Priority to PCT/CN2008/072430 priority patent/WO2009049518A1/en
Publication of CN101415250A publication Critical patent/CN101415250A/en
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L65/00—Network arrangements, protocols or services for supporting real-time applications in data packet communication
    • H04L65/10—Architectures or entities
    • H04L65/1016—IP multimedia subsystem [IMS]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L65/00—Network arrangements, protocols or services for supporting real-time applications in data packet communication
    • H04L65/1066—Session management
    • H04L65/1069—Session establishment or de-establishment
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L65/00—Network arrangements, protocols or services for supporting real-time applications in data packet communication
    • H04L65/1066—Session management
    • H04L65/1083—In-session procedures
    • H04L65/1095—Inter-network session transfer or sharing
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L65/00—Network arrangements, protocols or services for supporting real-time applications in data packet communication
    • H04L65/1066—Session management
    • H04L65/1101—Session protocols
    • H04L65/1104—Session initiation protocol [SIP]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
    • H04N21/60—Network structure or processes for video distribution between server and client or between remote clients; Control signalling between clients, server and network components; Transmission of management data between server and client, e.g. sending from server to client commands for recording incoming content stream; Communication details between server and client 
    • H04N21/61—Network physical structure; Signal processing
    • H04N21/6106—Network physical structure; Signal processing specially adapted to the downstream path of the transmission network
    • H04N21/6125—Network physical structure; Signal processing specially adapted to the downstream path of the transmission network involving transmission via Internet
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
    • H04N21/60—Network structure or processes for video distribution between server and client or between remote clients; Control signalling between clients, server and network components; Transmission of management data between server and client, e.g. sending from server to client commands for recording incoming content stream; Communication details between server and client 
    • H04N21/63—Control signaling related to video distribution between client, server and network components; Network processes for video distribution between server and clients or between remote clients, e.g. transmitting basic layer and enhancement layers over different transmission paths, setting up a peer-to-peer communication via Internet between remote STB's; Communication protocols; Addressing
    • H04N21/643—Communication protocols
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N7/00—Television systems
    • H04N7/16—Analogue secrecy systems; Analogue subscription systems
    • H04N7/173—Analogue secrecy systems; Analogue subscription systems with two-way working, e.g. subscriber sending a programme selection signal
    • H04N7/17309—Transmission or handling of upstream communications

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  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Business, Economics & Management (AREA)
  • General Business, Economics & Management (AREA)
  • Mobile Radio Communication Systems (AREA)
  • Data Exchanges In Wide-Area Networks (AREA)
  • Telephonic Communication Services (AREA)

Abstract

The invention discloses a method for establishing session in an IP internet TV system, comprising the following steps: position information of a media server or parameter information corresponding to parameters of a media control channel of the media server is returned to a terminal, or the parameter information of the media control channel of the media server is returned respectively for a plurality of times so as to establish session connection between the terminal and the media server and conform to the treating principle of SDP. A session establishing system and a content positioning functional entity in an IP internet TV system are also disclosed.

Description

Session is set up in the IP internet TV system method, system and entity
Technical field
The present invention relates to the data transmission technology of the communications field, relate in particular to session is set up in a kind of IP internet TV system method, system and entity.
Background technology
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, people no longer are satisfied with single voice communication mode, and multimedia communication mode that need be brand-new, therefore, the fusion of IPization, Internet and the communication network of mobile communication network and fixed telecommunication network becomes the developing direction that industry is generally acknowledged undisputedly.Be to satisfy the common requirements of more and more outstanding IP multimedia application, 3G (Third Generation) Moblie tissue (3GPP) on the packet carrying network basis, introduced all-IP business network framework IP Multimedia System (IP Multimedia Subsystem, IMS).
IMS is WCDMA access system (the Wide-band CodeDivision Multiple Access that increases in the 3GPP R5 stage, WCDMA) be superimposed upon a subsystem that has on the packet domain in the network, adopt the bearer path of packet domain as its upper strata control signaling and media delivery, introduce conversation initialized protocol (Session Initiated Protocol, SIP) agreement is as professional control protocol, utilize simple, the easy expansion of Session Initiation Protocol, media combination characteristics easily, professional control is separated with carrying control, abundant multimedia service is provided.
The main functional entity of IMS comprises control user registration, the call conversation control entity of functions such as session control (Call Session Cobtrol Function, CSCF), application server (the Application Server of miscellaneous service logic control function is provided, AS), home subscriber server (the Home Subscriber Server of centralized management user contracting data, HSS) and be used to realize MGCF/media gateway (Media Gateway Control Function/Media Gateway with the circuit switching net interconnecting, MGCF/IM-MGW), the user is by current location agent node (Proxy-CSCF, P-CSCF) insert IMS, session and professional the triggering are controlled and are then finished by the home domain service node (S-CSCF) of its registered place alternately with the business control of AS.
Progressively perfect along with the IMS agreement, TV (IMS based IPTV) business based on the IP internet is rapidly developed, IMS based IPTV business makes full use of existing registration, authentication, route, session control and foundation in the IMS network, professional triggering, charging and end-to-end QoS, and (Quality ofService, QoS) mechanism such as assurance comes streaming media service to be provided, to merge the multimedia service of Streaming Media and real-time session business for the user.
The IMSbased IPTV business function framework of service that current next generation network communication and internet merge and agreement (TISPAN) definition as shown in Figure 1, IPTV media server (IPTV Media Functions, MF) responsible control and payment (Delivery) to the UE Media Stream.From functional perspective be decomposed into the media control function entity (Media Control Function, MCF) and the media delivery functional entity (Media DeliveryFunction, MDF).
Session Initiation Protocol and RTP/real time control protocol (Real-time Transport Protocol/Realtime Transport Control Protocol, RTP/RTCP), service data point (Service DataPoint, SDP), transmit stream media protocol (Real-Time Streaming Protocol in real time, RTSP), name server (Domain Name Server, DNS) etc. agreement cooperates, and finishes the session foundation and the media negotiation of IPTV system jointly.
In existing IPTV network design, the different medium compositions of same medium composition may be provided by different providers, and are distributed on the different media servers.Such as to a movie contents, may be equipped with English, Chinese, French, German, Japanese or the like is multi-lingual, these different audio files (audio), (video) leaves on the different media servers with video file.When the user watches this film, need to set up media control channel like this, connect as RTSP with different media servers, and content transmission passage, connect as RTP.
In existing IPTV system, terminal equipment UE can pass through Electronic Program Guide (ElectronicProgram Guide, mode such as EPG), the media description information of the media server at the medium composition place of acquisition request, this media description information has comprised the address information of media server, mode by RTSP unified resource identifier (RTSP URI) is again set up then between UE and this media server and is connected.
At present, in the system of realization content-on-demand (CoD) business that defines in TISPAN IPTV standard, UE exists as the IPTV terminal, and it can be PC, TV, set-top box or portable terminal, and the user can watch the IPTV program by UE.The sip message that UE will comprise the medium component identification sends to business control function body (Service Control Function by IMS equipment (IMS CORE), SCF), this SCF provides the application server of CoD business, is responsible for the control (service authorization, charging and professional control etc.) of service logic.IMS CORE sends to MF with sip message, by this MF the medium composition is sent to UE.MF exists as the media server of CoD service media composition, can be divided into MCF and MDF in logic, and wherein, MCF is responsible for medium control, and MDF is responsible for the medium composition and pays.After MCF received sip message, indication MDF set up being connected of RTSP with UE, and by RTP/RTCP Media Stream is sent to UE.
But, when the different medium component distributing of same medium composition are on different media servers, terminal need be known the distribution situation (be distributed in during as each medium composition on the media server still a plurality of media servers) of each medium composition of medium composition by media description information, thus the number that decision connects.Yet, in the TISPAN regulation, introduced the MF position fixing process, be positioned at same media server or lay respectively at different servers so terminal can't be known each composition of the medium composition of request in advance.
If being sound, video compositions of medium composition, actual conditions lay respectively at different media servers, but end side thinks that each composition of medium composition is positioned at same media server, then initiates to comprise in invitation (SIP INVITE) request of medium component identification and has only a media control channel (as a RTSP); After network side receives this SIP INVITE, find that sound, video data are positioned at different media servers, just need in response, return two media control channels (as two RTSP) and could allow terminal realize session foundation to terminal.But return the principle that two media control channels have been violated SDP, can't carry out the normal handling flow process, the scheme that does not also address this problem at present.
Summary of the invention
The embodiment of the invention provides a kind of session is set up in the IPTV system method, system and entity, with solve exist in the prior art when the medium composition is positioned at different server, terminal can't be set up the problem of session connection with media server.
The method that session is set up in a kind of IP internet TV system, this method comprises:
Terminal sends the conversation initial request to content positioning function entity, comprises the medium component identification in this request;
Described terminal receives the positional information that described content positioning function entity returns, this positional information is: the positional information of at least two media servers at the medium composition place that described sign is corresponding, or known the positional information of content positioning function entity of positional information of at least two media servers at the medium composition place that described sign is corresponding;
Described terminal utilizes the media server at the described positional information medium composition place corresponding with described sign to set up session connection.
The system that session is set up in a kind of IP internet TV system, the system that this session is set up comprises:
Terminal is used to send the conversation initial request that comprises the medium component identification, receiving position information, and utilize the media server at the described positional information medium composition place corresponding to connect with described sign;
Content positioning function entity, be used to receive described conversation initial request, and return described positional information to described terminal, this positional information is: the positional information of at least two media servers at the medium composition place that described sign is corresponding, or known the positional information of content positioning function entity of at least two media server positional informations at the medium composition place that described sign is corresponding;
Described media server is used for setting up session connection with described terminal.
A kind of content positioning function entity, this content positioning function entity comprises:
Receiver module is used to receive the conversation initial request, comprises the medium component identification in this request;
The positional information determination module, the positional information of at least two media servers at the medium composition place that is used for determining that described sign is corresponding, or known the positional information of content positioning function entity of at least two media server positional informations at the medium composition place that described sign is corresponding;
Sending module is used to send the positional information that described positional information determination module is determined.
The method that session is set up in a kind of IP internet TV system, this method comprises:
The conversation initial request that content positioning function entity receiving terminal sends comprises the medium component identification in this request;
Described content positioning function entity is determined at least two media servers at the medium composition place that described sign is corresponding, and obtain the media control channel parameter information of described media server, return the local media control channel parameter information that distributes to terminal, there is corresponding relation in the described local media control channel parameter information that distributes with the media control channel parameter information of the media server that obtains.
The system that session is set up in a kind of IP internet TV system, the system that this session is set up comprises:
Terminal is used to send the conversation initial request that comprises the medium component identification, and receiving media control channel parameter information;
Content positioning function entity, be used to receive described conversation initial request, determine at least two media servers at the medium composition place that described sign is corresponding, and obtain the media control channel parameter information of described media server, return the local media control channel parameter information that distributes to terminal, there is corresponding relation in the described local media control channel parameter information that distributes with the media control channel parameter information of the media server that obtains.
A kind of content positioning function entity, this content positioning function entity comprises:
Receiver module is used to receive the conversation initial request, comprises the medium component identification in this request;
Acquisition module is used for determining described at least two media servers that identify corresponding medium composition place, and obtains the media control channel parameter information of described media server;
Sending module is used for returning the local media control channel parameter information that distributes to terminal, and there is corresponding relation in the described local media control channel parameter information that distributes with the media control channel parameter information of the media server that obtains.
The method that session is set up in a kind of IP internet TV system, this method comprises:
Terminal sends the conversation initial request to content positioning function entity, comprises the medium component identification in this request;
Described content positioning function entity obtains the media control channel parameter information of at least two media servers at the corresponding medium composition place of described sign respectively, and described parameter information is returned to terminal respectively.
The system that session is set up in a kind of IP internet TV system, the system that this session is set up comprises:
Terminal is used to send the conversation initial request, comprises the medium component identification in this request, and receiving media control channel parameter information;
Content positioning function entity is used for obtaining respectively the described media control channel parameter information that identifies at least two media servers at corresponding medium composition place, and described parameter information is returned to terminal respectively.
A kind of content positioning function entity, this content positioning function entity comprises:
First receiver module is used to receive the conversation initial request, comprises the medium component identification in this request;
Acquisition module is used for obtaining respectively the described media control channel parameter information that identifies at least two media servers at corresponding medium composition place;
Sending module is used for described parameter information is returned respectively.
This embodiment is by returning the positional information of media server to terminal, or there is the parameter information of corresponding relation with the parameter of the media control channel of media server, or return the scheme of parameter information of the media control channel of media server several times, make when the medium composition of the medium composition of terminal request is positioned at different media servers, terminal on the basis of the treatment principle that meets SDP, realized and each media server between session connection.
Description of drawings
Fig. 1 is the business function configuration diagram based on the TV of IP internet;
Fig. 2 is the system configuration schematic diagram that session is set up in the IPTV system in the embodiment of the invention one;
Fig. 3 is a signaling process schematic diagram in the embodiment of the invention two;
Fig. 4 is a content positioning function entity structure schematic diagram in the embodiment of the invention three;
Fig. 5 is a signaling process schematic diagram in the embodiment of the invention four;
Fig. 6 is a signaling process schematic diagram in the embodiment of the invention five;
Fig. 7 is a system configuration schematic diagram in the embodiment of the invention six;
Fig. 8 is a content positioning function entity structure schematic diagram in the embodiment of the invention seven;
Fig. 9 is a signaling process schematic diagram in the embodiment of the invention eight;
Figure 10 is a signaling process schematic diagram in the embodiment of the invention nine;
Figure 11 is a system configuration schematic diagram in the embodiment of the invention ten;
Figure 12 is a content positioning function entity structure schematic diagram in the embodiment of the invention 11.
Embodiment
In order to solve technical problem proposed by the invention, network side will return the mode of media server positional information to terminal, realize the foundation of session; Perhaps utilize multiple mode to return the mode of the media control channel parameter information of media server, realize the foundation of session to terminal by network side.
Describe the present invention in detail below in conjunction with Figure of description.
As shown in Figure 2, be the system configuration schematic diagram that session is set up in the IPTV system in the embodiment of the invention one, this system comprises terminal 11, content positioning function entity 12 and media server 13, wherein, terminal 11 is used to send the conversation initial request that comprises the medium component identification, receiving position information, and utilize the media server 13 at the described positional information medium composition place corresponding to connect with described sign; Content positioning function entity 12 is used to receive described conversation initial request, and return described positional information to described terminal 11, this positional information is: the positional information of at least two media servers at the medium composition place that described sign is corresponding, or known the positional information of content positioning function entity of at least two media server positional informations at the medium composition place that described sign is corresponding; The number of media server 13 is at least two, is used for setting up session connection with described terminal 11.
If described positional information is the positional information of described content positioning function entity, the media server positional information that then described content positioning function entity 12 is used for the medium composition place that the described sign of having known is corresponding sends to described terminal 11; Described terminal 11 is used to utilize the described media server positional information that receives to set up session connection with media server 13 respectively.
Described system also comprises IMS equipment 14, is used for the conversation initial request that described terminal 11 sends is forwarded to described content positioning function entity 12.
In present embodiment and follow-up each embodiment, described content positioning function entity can be SCF, MCF or MDF, or being independent of the independent community of SCF, MCF and MDF with media server selection function, so-called media server selection function can be to determine the function of the media server at medium composition place.
Described positional information returns to terminal by redirect message or notification message (Notify), particularly, can be that header field or the message body property column by described redirect message or Notify carries.
The medium composition generally comprises audio frequency media composition, video media composition and print media's composition (captions) etc., in embodiments of the present invention, for convenience, comprise audio frequency media composition and video media composition in the setting medium composition, and these two medium component distributing are in different media servers.
The method that the embodiment of the invention two provides a kind of in IPTV system session corresponding with system among the embodiment one to set up as shown in Figure 3, is the signaling process schematic diagram of this method, and this process mainly may further comprise the steps:
Step 301: terminal comprises the medium component identification of request to IMS CORE initiation session initial request in this request.
In the present embodiment, the medium component identification can be carried by unified resource identifier request message (RequestURI), and this sign can be SIP:movie@SCF.com, the medium composition of marking terminal request.
The described conversation initial request that step 302:IMS CORE will receive sends to content positioning function entity.
Described conversation initial request also can be transmitted to content positioning function entity by other entities, is not limited to IMS CORE.
In various embodiments of the present invention, content positioning function entity can be SCF, MCF or MDF, perhaps is independent of the independent community with media server selection function of SCF, MCF and MDF, and in the present embodiment, setting content positioning function entity is SCF.
Audio frequency RTP medium be can carry in the conversation initial request described in step 301 and the step 302 and passage, a video RTP medium transmission passage transmitted, a RTSP media control channel, wherein, media control channel is controlled sound simultaneously, video media transmits passage.The parameter information of these passages can be included among the SDP Offer, also may carry by the signaling header field, and as the SIP header field, the RTSP header field.Present embodiment is an example to be included among the SDP Offer, and its expression can be as follows:
M=video 3400 RTP/AVP 98//video RTP medium transmit passage
a＝rtpmap：98?H263
a＝label：1
M=audio 3456 RTP/AVP 97//audio frequency RTP medium transmit passage
a＝rtpmap：97?AMR
a＝label：2
M=application 9 TCP/RTSP rtsp//RTSP media control channels
a＝connection：new
a＝setup：active
a＝rtspid?m-stream：1，2
Step 303: content positioning function entity is determined at least two media servers at the medium composition place of described medium component identification correspondence.
SCF determines that according to the medium component identification that receives the audio frequency media composition in this medium composition is arranged in media server A (as the media server of MCF1 control), and the video media composition is arranged in media server B (as the media server of MCF2 control).
Step 304: content positioning function entity returns to terminal with the positional information of described media server, or will know that the positional information of the content positioning function entity of described media server positional information returns to terminal.
SCF returns the initial session response message to terminal, comprises the positional information of media server A and the positional information of media server B in this response message, indicates different medium compositions to be stored on the different media servers; The positional information of SCF that perhaps in response message, comprises the positional information of the positional information of having known media server A and media server B.
In the present embodiment, positional information can be that logical location information also can be a physical location information.Logical location information is meant: the positional information of being responsible for the content positioning function entity of the different medium compositions of processing; Physical location information is meant: the positional information of the media server at different medium compositions place, terminal directly utilize this physical location information to connect with corresponding media server.For example, the logical location information of medium composition A is: SIP:audio.movie@SCF.com, the logical location information of medium composition B is: SIP:video.movie@SCF.com.Physical location information can be SIP URI, and for example, the physical location information of medium composition A is: SIP:audio.movie@MF1.com, and the physical location information of medium composition B is: SIP:video.movie@MF2.com; Physical location information can also be RTSP URI, and for example, the physical location information of medium composition A is: RTSP: //MF.com/movie/audio, the logical location information of medium composition B is: RTSP: //MF.com/movie/video.
If content positioning function entity is MCF, then the logical location information of medium composition A is: SIP:audio.movie@MCF.com, the logical location information of medium composition B is: SIP:video.movie@MCF.com.The physical location information of medium composition A is: SIP:audio.movie@MDF1.com, and the physical location information of medium composition B is: SIP:video.movie@MDF2.com; Perhaps, the physical location information of medium composition A is: RTSP: //MDF.com/movie/audio, the logical location information of medium composition B is: RTSP: //MDF.com/movie/video.
The initial session response message can be realized by SIP 3XX redirect message, includes but not limited to more options message (300 message).Also can realize, as 183 Temporary Response message by other response messages.
The positional information of described media server or content positioning function entity can be carried at the header field of response message, as contact (Contact) header field; Or in the message body, as passing through the message body property column, as the a=control property column, example is as follows:
M=video 3400 RTP/AVP 98//video RTP medium transmit passage
A=control: positional information
a＝rtpmap：98?H263
a＝label：1
M=audio 3456 RTP/AVP 97//audio frequency RTP medium transmit passage
A=control: positional information
a＝rtpmap：97?AMR
a＝label：2
M=application 0 TCP/RTSP rtsp//RTSP media control channel, port is set to 0, the expression refusal
a＝rtspid?m-stream：1，2
Simultaneously, can expand SIP Content-Disposition header field, as be set to " Redirect " or certain other sign, how indicating terminal resolves message body, perhaps the content in the message header field.
Present embodiment can also be given terminal by SIP passage home position information, and the mode of specifically returning can be passed through 3xx message, perhaps 1xx message as mentioned above.In fact, can give terminal, as passing through Subscribe/Notify message by various possible mode home position information.Perhaps by the Option method, perhaps expand a kind of new SIP method, perhaps message etc.
Step 305: terminal is set up session connection according to described positional information and the media server of preserving the medium composition.
If the positional information that terminal receives is a logical location information, then set up request according to this logical location information initiation session, request requires to set up session connection with the media server A at audio frequency media composition place and the media server B at video media composition place respectively through SCF.Carry logical location information among the RequestURI in session foundation request.Then the media server A that will know of SCF and the positional information of media server B are informed terminal, after passage is set up, media server A and media server B will carry the SDP Answer that the media control channel information of audio frequency correspondence and media control channel parameter information that medium transmit channel information, video correspondence and medium transmits channel parameters information by SCF respectively and return to terminal.
If the positional information that terminal receives is a physical location information, then terminal is directly set up session connection according to this physical location information and media server A and media server B, and after session connection was set up, media server A and media server B directly returned each channel parameters information to terminal.
In present embodiment two, describe as content positioning function entity with SCF, same, above-mentioned flow process also is applicable to the situation of MCF as content positioning function entity.Receive the conversation initial request of terminal transmission by MCF after, determine that video composition and video component distributing are on different MDF, then MCF will comprise the positional information of each MDF or know the positional information of MCF of the positional information of each MDF in the initial session response message that terminal is returned, and terminal is set up session connection according to described positional information with corresponding MDF.When MCF did not support centralized control (aggregate control), this mode was especially suitable.
Corresponding to embodiment one and embodiment two described system and methods, the embodiment of the invention three also provides a kind of content positioning function entity, as shown in Figure 4, comprise receiver module 21, positional information determination module 22 and sending module 23, wherein, receiver module 21 is used to receive the conversation initial request that comprises the medium component identification; The positional information of at least two media servers at the medium composition place that positional information determination module 22 is used for determining that described sign is corresponding, or known the positional information of content positioning function entity of at least two media server positional informations at the medium composition place that described sign is corresponding; Sending module 23 is used to send the positional information that described positional information determination module 22 is determined.Described positional information is carried by redirect message or Notify.Further, be that header field or message body property column by described redirect message or Notify carries.
Equally, the described content positioning function of present embodiment entity also can be SCF, MCF or MDF, or the independent community with media server selection function.
By the embodiment of the invention one, two and three, the positional information that content positioning function entity will be deposited the media server of each medium composition directly or indirectly returns to terminal, terminal is set up session connection according to positional information, make terminal room just realize the session connection with a plurality of media servers, and session connection is to set up by the positional information of media server, avoid the media control channel of request and the unmatched problem of control channel number that connects, met the treatment principle of SDP.
In embodiments of the present invention, can also connect by content positioning function entity and the media server of depositing the medium composition, promptly set up plurality of media control channel, and returning number (as) the media control channel corresponding parameters information of setting to terminal, there is corresponding relation in the parameter information of this parameter information and content positioning function entity and the plurality of media control channel set up.
As shown in Figure 5, be signaling process schematic diagram in the embodiment of the invention four, in the present embodiment, the same audio frequency component of setting in the medium composition of asking is positioned at media server A, and the video composition is positioned at media server B, and this method comprises:
Step 501: terminal comprises the medium component identification of request to IMS CORE initiation session initial request in this request.
The conversation initial request can be carried an audio frequency media and be transmitted passage, a video media transmission passage, a media control channel.
The described conversation initial request that step 502:IMS CORE will receive sends to content positioning function entity.
Step 501 and step 502 and abovementioned steps 301 and step 302 are similar.
Step 503: content positioning function entity determines that according to described medium component identification the medium composition of this medium composition lays respectively at media server A and media server B.
Step 504: content positioning function entity and media server A set up session connection, obtain the media control channel parameter information of media server A.
In the present embodiment, can setting content positioning function entity be SCF also.
SCF is to media server A initiation session initial request, and wherein, SDP Offer carries media control channel parameter information (RTSP channel parameters information), and medium transmit channel parameters information (RTP channel parameters information).At this moment, the media control channel parameter information is SCF this locality, and it is the audio frequency media composition corresponding parameters information of carrying in the conversation initial request of terminal initiation that medium transmit channel parameters information.
Conversation initial request in this step can realize by SIP Invite.
Media server A returns the conversation initial response to SCF, and this process can realize by SIP 200 OK or SIP183.
By step 504, SCF and media server A set up audio frequency media and transmit passage and audio frequency media control channel, and promptly SCF obtains the control channel parameter information of media server A correspondence and transmits channel parameters information.
Step 505: content positioning function entity and media server B set up session connection, obtain the media control channel parameter information of media server B.
The realization and the step 504 of step 505 are similar, and SCF and media server B set up video media and transmit passage and video media control channel.
The processing procedure of SCF is similar to fork (Forking) processing procedure in the conventional session business in step 504 and the step 505.
Step 506: content positioning function entity returns the conversation initial response to terminal, comprise the media control channel parameter in this response, there is corresponding relation in the media control channel parameter between described parameter and content positioning function entity and media server A, the media server B.
After SCF receives the conversation initial response that media server A and media server B return, directly do not return the parameter of these two media control channels to terminal, but by media control channel parameter of the local distribution of SCF, set up corresponding relation with the parameter of two media control channels that obtain in step 504 and the step 505, and the media control channel parameter that SCF this locality is distributed returns to terminal, avoid the not reciprocity of the media control channel number that comprises in the terminal initiation session initial request and the media control channel number that receives like this, can set up session connection by SCF and media server A and media server B follow-up again.
Content positioning function entity in terminal is returned SDP Answer in the conversation initial response, carried with step 501 in the conversation initial request in medium composition corresponding parameters information: the local media control channel parameter information that distributes of SCF in the step 506, audio frequency media transmit channel parameters information and a video media transmits channel parameters information.
In this step, select SIP 200OK or SIP 183 to realize returning the process of response message according to the type of message that SCF in step 504 and the step 505 receives.
At this moment, terminal has been set up session connection by content positioning function entity and media server A and media server B, can realize the IPTV business.
If among the embodiment four, the medium composition all is positioned at same media server, then the media control channel parameter information with this media server correspondence directly returns to terminal, at this moment, still can regard as by content positioning function entity the identical parameter information of content of the media control channel parameter information correspondence of media server correspondence is returned to terminal.
If also comprise the parameter information of media control channel in the conversation initial request that terminal sends, and the bar number of the media control channel of parameter information correspondence is one, then the media control channel bar number of the parameter information correspondence of returning to terminal also is one, certainly, the parameter information of corresponding many media control channels of this parameter information that returns to terminal.If the bar number of the media control channel of the parameter information correspondence that the conversation initial request that terminal sends comprises is two, then the media control channel bar number of the parameter information correspondence of returning to terminal also is two, the parameter information of the media control channel of a counterpart media server wherein, parameter information of the media control channel of another corresponding residue media server.If it is similar greater than two situation.
Step at present embodiment four is equally applicable to the situation of MCF as content positioning function entity, when MCF finds that audio frequency component is with the video component distributing on different MDF the time, distribute RTSP media control channel information, and (this media control channel is not limited to RTSP to set up media control channel with each MDF respectively, also may be H.248, perhaps SIP, the specific implementation that depends on the VCR order), and preserve described and audio frequency, the corresponding relation of the parameter information of the RTSP media control channel of the parameter information of the media control channel of video MDF and distribution, and the parameter information of the RTSP media control channel that will distribute returns to terminal, makes terminal can realize the IPTV business.
Terminal can directly be controlled two MDF according to the RTSP media control channel that distributes, in addition, a kind of method also is provided in the embodiment of the invention five, can allow terminal directly MDF1 be controlled, indirectly MDF2 is controlled, in the present embodiment, content positioning function entity is MCF, as shown in Figure 6, this method step is:
Step 601: terminal comprises the medium component identification of request to IMS CORE initiation session initial request in this request.
The conversation initial request can be carried an audio frequency media and be transmitted passage, a video media transmission passage, print media's transmission passage and a media control channel.
The described conversation initial request that step 602:IMS CORE will receive sends to SCF.
Step 601 and step 602 and abovementioned steps 301 and step 302 are similar.
Step 603:SCF sends to MCF with described conversation initial request.
Step 604:MCF lays respectively at MDF1, MDF2 and MDF3 according to the medium composition that described medium component identification inquires this medium composition.
In the present embodiment, the setting audio composition is positioned at MDF1, and the video composition is positioned at MDF2, and the literal composition is positioned at MDF3.
Step 605:MCF and MDF1 set up session connection.
Carry out the media delivery session control between MCF and the MDF1, set up session connection between MCF and the MDF1, promptly MCF obtains audio frequency media and transmits channel parameters information, and as RTP channel parameters information, audio frequency media control channel parameter information is as RTSP channel parameters information.Parameter information may comprise the IP address of respective channel and/or port information etc.
In this step the communication protocol of MCF and MDF can for H.248, a kind of or combination in any in RTSP or the Session Initiation Protocol.
Step 606:MCF and MDF2 set up video media and transmit passage.
Carry out the media delivery session control between MCF and the MDF2, MCF obtains video media and transmits channel parameters information, as RTP channel parameters information.
Equally, the communication protocol of MCF and MDF can for H.248, a kind of or combination in any in RTSP or the Session Initiation Protocol.
This step is not to exist, and MCF can temporarily not get in touch with MDF2 yet, as shown in phantom in FIG..
Step 607:MCF and MDF3 set up print media and transmit passage.
This step is similar with step 606, neither exist, and MCF can temporarily not get in touch with MDF3 yet.
Step 608:MDF1 sets up control channel with MDF2 and MDF3 respectively, and sets up the corresponding relation of this control channel parameter information and described audio frequency media control channel parameter information.
MCF notice MDF1 and MDF2 and MDF3 set up control channel, and the audio frequency media control channel that above-mentioned steps 605 is consulted is used to control the medium composition of MDF2 and MDF3 correspondence simultaneously.Promptly when MDF1 receives the message of the audio frequency media control channel that above-mentioned steps 605 consults, as F.F., rewind down etc., MDF1 determine according to the corresponding relation set up and MDF2 and MDF3 between the control channel parameter information, the video media composition of control MDF2 and the word content of MDF3 carry out same operation; Perhaps, MDF1 obtains the content among MDF2 and the MDF3, and the medium composition that distributes is focused on the media server, and MDF1 obtains the video media composition and offers terminal from MDF2 and MDF3 then.
This step can independently realize, perhaps with step 605 together; If step 606 and step 607 do not exist, then this step is used for the function in performing step 606 and the step 607 simultaneously.
Equally, the communication protocol of MCF and MDF can for H.248, a kind of or combination in any in RTSP or the Session Initiation Protocol.
Step 609:MCF returns the conversation initial response to terminal, comprises audio frequency media control channel parameter information in this response.
SDP Answer in the response of conversation initial in this step carry with step 601 in the information of medium composition correspondence in the conversation initial request: media control channel parameter information, audio frequency media transmit channel parameters information, video media transmits channel parameters information and a print media transmits channel parameters information.The media control channel parameter information that media control channel parameter information MCF produces; Audio frequency media transmits the medium transmission channel parameters information that channel parameters information is the MDF1 correspondence; The information that video media transmits passage is the medium transmission channel parameters information of MDF2 correspondence; The information that print media transmits passage is the medium transmission channel parameters information of MDF3 correspondence.If do not have step 606 and step 607, then the medium of MDF2 and MD3 correspondence transmission channel parameters information can be invalid information.
This conversation initial response is forwarded to terminal by SCF and IMS CORE, can be to realize by SIP200 OK or SIP 183.
There is the mutual of intermediary message in parameter information in the response that receives of terminal basis and MCF when setting up session connection, as ACK, PRACK etc., repeat no more herein.
The same corresponding embodiment of the invention of the embodiment of the invention four and embodiment five six described systems, as shown in Figure 7, this system comprises terminal 31 and content positioning function entity 32, wherein, terminal 31 is used to send the conversation initial request that comprises the medium component identification, and receiving media control channel parameter information; Content positioning function entity 32 is used to receive described conversation initial request, determine at least two media servers at the medium composition place that described sign is corresponding, and obtain the media control channel parameter information of described media server, and will exist the media control channel parameter information of corresponding relation to return to terminal 31 with this parameter information.
Described system also comprises at least two media servers 33, and then described content positioning function entity 32 is used to obtain the first media control channel parameter information of first media server of determining 33, and this parameter information is returned to terminal 31; Described first media server 33 is used for setting up the control channel parameter information respectively with the remaining media server of determining, and sets up the corresponding relation of this control channel parameter information and the described first media control channel parameter information.
Described system also comprises IP Multimedia System equipment 34, is used for the described conversation initial request that terminal 31 sends is forwarded to content positioning function entity 32.
Described content positioning function entity 32 is SCF, MCF or MDF.
If described content positioning function entity is MCF, then described IP Multimedia System equipment 34 is used for the described conversation initial request that terminal sends is forwarded to SCF; SCF is used for described conversation initial request is forwarded to MCF.
Corresponding among the embodiment of the invention seven described content positioning function entities and the embodiment four to embodiment six, as shown in Figure 8, this entity comprises receiver module 41, acquisition module 42 and sending module 43, wherein, receiver module 41 is used to receive the conversation initial request, comprises the medium component identification in this request; Acquisition module 42 is used for determining described at least two media servers that identify corresponding medium composition place, and obtains the media control channel parameter information of described media server; Sending module 43 is used for and will exists the media control channel parameter information of corresponding relation to send with the described parameter information that obtains.
If content positioning function entity is MDF, then described acquisition module 42 comprises performance element 44 and sets up unit 45 that wherein, performance element 44 is used for the media control channel parameter information of self is sent to described sending module 43; Set up unit 45 and be used for setting up the control channel parameter information respectively, and set up this control channel parameter information and described self the corresponding relation of media control channel parameter information with remaining media server.
By the embodiment of the invention seven described methods, system and content positioning function entity, both avoided the situation of a plurality of media control channel parameter informations of returning, pass through the corresponding relation of foundation again, a media control channel parameter information that makes terminal to utilize to receive is controlled a plurality of media control channel parameter informations, has successfully set up conversation procedure.
Another kind of implementation is proposed in the embodiment of the invention eight, terminal is obtained several times by content positioning function entity and is returned media server media control channel parameter information to terminal, as shown in Figure 9, if the audio frequency media composition of medium composition is positioned at media server A, the video media composition is positioned at media server B, and then step comprises:
Step 901: terminal comprises the medium component identification of request to IMS CORE initiation session initial request in this request.
The conversation initial request can be carried an audio frequency media and be transmitted passage, a video media transmission passage, a media control channel.
The described conversation initial request that step 902:IMS CORE will receive sends to content positioning function entity.
Step 901 and step 902 and abovementioned steps 301 and step 302 are similar.
Step 903: content positioning function entity determines that according to described medium component identification the medium composition of this medium composition lays respectively at media server A and media server B.
Step 904: content positioning function entity and media server A set up session connection.
In the present embodiment, can setting content positioning function entity be SCF also.
SCF is to media server A initiation session initial request, and wherein, SDP Offer carries media control channel parameter information (RTSP channel parameters information), and medium transmit channel parameters information (RTP channel parameters information).At this moment, the media control channel parameter information is the media control channel parameter information that carries in the terminal request, and it is the audio frequency media composition corresponding parameters information of carrying in the conversation initial request of terminal initiation that medium transmit channel parameters information.
Conversation initial request in this step can realize by SIP Invite.
Media server A returns the conversation initial response to SCF, and this process can realize by SIP 200 OK or SIP183.
By step 904, SCF and media server A set up audio frequency media and transmit passage and audio frequency media control channel.
Step 905: content positioning function entity and media server A set up video media and transmit passage.
At this moment, SDP Offer carries medium and transmits channel parameters information (RTP channel parameters information), and it is the video media composition corresponding parameters information of carrying in the conversation initial request of terminal initiation that medium transmit channel parameters information.
In the present embodiment, step 905 is optionally in existence, shown in the dotted line, in realization, is to set up audio frequency media earlier to transmit passage and audio frequency media control channel among the figure, and it also is optional still setting up video media transmission passage and video media control channel earlier.
Step 906: content positioning function entity returns the conversation initial response to terminal, comprises audio frequency media control channel parameter information in this response.
Carry among the SDP Answer in the conversation initial response with step 901 in the conversation initial request in the information of medium composition correspondence: a media control channel parameter information, an audio frequency media transmits channel parameters information, and a video media transmits channel parameters information.In the present embodiment, the media control channel parameter information is that media server A goes up corresponding media control channel parameter information; It is that media server A goes up corresponding medium transmission channel information that audio frequency media transmits channel parameters information; If step 905 exists, then video media transmission channel parameters information is that media server B goes up corresponding medium transmission channel information, if step 905 does not exist, then video media transmission channel parameters information can be a parameter information of SCF any configuration, extend this as 0.0.0.0 as the address in the parameter information, port is any.
Select SIP 200 OK or SIP183 to realize returning the process of response message according to the type of message that SCF in step 904 and the step 905 receives.
In the present embodiment, there be the mutual of intermediary message in parameter information during terminal responds according to the conversation initial that receives and media server when setting up session connection, as response message (ACK), interim reliable response (PRACK) etc., repeat no more herein.
Step 907: content positioning function entity and media server B set up video media control channel, and this control channel parameter information is returned to terminal.
In this step, can initiate request once more by terminal and require to set up video media control channel, can initiate request by SCF and set up video media control channel with media server B with media server B.
Initiating request with SCF is example, if step 905 exists, then SCF revises request to media server B initiation session, require to set up video media control channel with media server B, media server B returns the session modification response message to SCF, by this response message, SCF obtains the parameter information of the media control channel of media server B correspondence, and this parameter information returned to terminal by session modification request, after terminal receives the parameter information of media control channel of media server B correspondence, return the session modification response to SCF.
Session modification request can realize by the invitation message again (SIP reInvite) of conversation initialized protocol or updating message (SIP Update) message of conversation initialized protocol.
If step 905 does not exist, then SCF is to media server B initiation session initial request, require to set up video media control channel and video media transmission passage with media server B, media server B returns the conversation initial response message to SCF, by this response message, SCF obtains the parameter information of media control channel of media server B correspondence and the parameter information that medium transmit passage, and this parameter information is returned to terminal by the session modification response message.
At this moment, the conversation initial request can be passed through SIP Invite message.
As if initiating request with terminal is example, and then terminal is revised request to the SCF initiation session, and then SCF returns the video media control channel parameter information of media server B correspondence to terminal according to the situation of above-mentioned SCF initiation request.
With in the step 606 similarly, terminal exist when setting up session connection with media server B according to the parameter information in the response that receives intermediary message alternately, as ACK, PRACK etc., repeat no more herein.
In above-mentioned steps 901 to step 907, the only corresponding media control channel of the media control channel parameter information that returns to terminal, but the identical parameter information of content that also can be regarded as the media control channel parameter information correspondence that SCF is obtained returns to terminal.
In addition, if each medium component distributing is in three media servers in the medium composition of request, then can be earlier obtain the wherein media control channel parameter information of two media server correspondences, obtain the media control channel parameter information of the 3rd media server correspondence again according to the mode of embodiment eight steps 907 according to the mode of embodiment four.
In the present embodiment, after step 906, content positioning function entity is after terminal has been returned media server A corresponding audio media control channel parameter information, also can not carry out follow-up operation, but the positional information of media server B is returned to terminal, set up session connection by terminal according to mode and the media server B that embodiment two describes.
In embodiment eight, be that SCF is of the present invention as the realization of content positioning function entity, in the embodiment of the invention nine, be that example is described the present invention as content positioning function entity with MCF, as shown in figure 10, comprising:
Step 1001: terminal comprises the medium component identification of request to IMS CORE initiation session initial request in this request.
The conversation initial request can be carried an audio frequency media and be transmitted passage, a video media transmission passage, a media control channel.
The described conversation initial request that step 1002:IMS CORE will receive sends to SCF.
Step 1001 and step 1002 and abovementioned steps 301 and step 302 are similar.
Step 1003:SCF sends to MCF with described conversation initial request.
Step 1004:MCF determines that according to described medium component identification the medium composition of this medium composition lays respectively at MDF1 and MDF2.
In the present embodiment, the setting audio composition is positioned at MDF1, and the video composition is positioned at MDF2.
Step 1005:MCF and MDF1 set up session connection.
Carry out the media delivery session control between MCF and the MDF1, set up session connection between MCF and the MDF1, promptly MCF obtains audio frequency media and transmits channel parameters information, and as RTP channel parameters information, the media control channel parameter information is as RTSP channel parameters information.Parameter information may comprise the IP address of respective channel and/or port information etc.
In this step the communication protocol of MCF and MDF can for H.248, a kind of or combination in any in RTSP or the Session Initiation Protocol.
Step 1006:MCF and MDF2 set up video media and transmit passage.
Carry out the media delivery session control between MCF and the MDF2, MCF obtains video media and transmits channel parameters information, as RTP channel parameters information.
Equally, the communication protocol of MCF and MDF can for H.248, a kind of or combination in any in RTSP or the Session Initiation Protocol.
This step is not to exist, and MCF can temporarily not get in touch with MDF2 yet.
Step 1007:MCF returns the conversation initial response to terminal, comprises audio frequency media control channel parameter information in this response.
SDP Answer in the response of conversation initial in this step carry with step 1001 in the information of medium composition correspondence in the conversation initial request: a media control channel parameter information, an audio frequency media transmits channel parameters information, and a video media transmits channel parameters information.The media control channel parameter information is the media control channel parameter information of MDF1 correspondence; Audio frequency media transmits the medium transmission channel parameters information that channel parameters information is the MDF1 correspondence; If step 1006 exists, then video media transmits the medium transmission channel parameters information that the information of passage is the MDF2 correspondence; If step 1006 does not exist, then the information of video media transmission passage is an invalid information of SCF any configuration.
This conversation initial response is forwarded to terminal by SCF and IMS CORE, can be to realize by SIP200 OK or SIP 183.
There is the mutual of intermediary message in parameter information in the response that receives of terminal basis and MDF1 when setting up session connection, as ACK, PRACK etc., repeat no more herein.
Step 1008:MCF and MDF2 set up video media control channel, and video media control channel parameter information is returned to terminal.
Transmit passage if only set up video media in the step 1006 between MCF and the MDF2, then carry out the media delivery session control between MCF and the MDF2 in this step, MCF and MDF2 set up video media control channel, MCF obtains the video media control channel parameter information of MDF2 correspondence, and the session modification request that will comprise this parameter information is forwarded to terminal by SCF and IMS CORE, and terminal is revised response by IMSCORE and SCF with session again and returned to MCF.
Transmitted passage if both set up video media in the step 1006 between MCF and the MDF2, and set up video media control channel again, then step 1008 can not exist.
If step 1006 does not exist, then carry out the media delivery session control between MCF and the MDF2, video media control channel parameter information and video media that MCF obtains the MDF2 correspondence transmit channel parameters information, and the session modification request that will comprise these two parameter informations is forwarded to terminal by SCF and IMS CORE, and terminal is revised response by IMS CORE and SCF with session again and returned to MCF.
Equally, there be the mutual of intermediary message in parameter information that the terminal basis receives and MDF2 when setting up session connection, as ACK, PRACK etc., repeat no more herein.
If MCF does not support polymerization control (Aggregate control is also referred to as centralized control), then also can utilize scheme among the embodiment five, allow and set up two media control channels between terminal and the MCF.
Embodiment eight and embodiment nine are to be that example is described with the parameter information that comprises a media control channel in the conversation initial request, return the media control channel parameter information of a described media server at every turn, all return until media control channel parameter information with each media server at medium composition place.Similarly, if comprise the parameter information of the media control channel of setting number in the described conversation initial request, then described content positioning function entity at least once obtains and returns the media control channel parameter information of the described media server of same number, all returns until the media control channel parameter information with each media server at medium composition place.
The embodiment of the invention nine also can combine with embodiment two or embodiment five.
Scheme according to the foregoing description eight and embodiment nine descriptions, the embodiment of the invention ten also provides a kind of system that session is set up in the IPTV system, as shown in figure 11, comprise terminal 51 and content positioning function entity 52, wherein, terminal 51 is used to send the conversation initial request that comprises the medium component identification, and receiving media control channel parameter information; Content positioning function entity 52 is used for obtaining respectively the described media control channel parameter information that identifies at least two media servers at corresponding medium composition place, and described parameter information is returned to terminal respectively.
If comprise the parameter information of the media control channel of setting number in the described conversation initial request, then described content positioning function entity 52 is used at least once obtaining and return the media control channel parameter information of the described media server of same number.
Described system also comprises media server 53, and then when the media control channel parameter information of same number was obtained and returns at least twice requirement, described content positioning function entity 52 was used for revising request to described media server 53 initiation session; Described media server 53 is used for returning to described content positioning function entity 52 parameter information of media control channel.Described session modification request is by SIP reInvite or SIPUpdate carrying.
Described system also comprises IP Multimedia System equipment 54, is used for described conversation initial request is transmitted to described content positioning function entity 52.
According to embodiment eight to embodiment ten described method and system, the embodiment of the invention 11 also provides a kind of content positioning function entity, as shown in figure 12, this content positioning function entity comprises: first receiver module 61, acquisition module 62 and sending module 63, wherein, first receiver module 61 is used to receive the conversation initial request, comprises the medium component identification in this request; Acquisition module 62 is used for obtaining respectively the media control channel parameter information of at least two media servers that the corresponding medium composition of described sign is positioned at; Sending module 63 is used for described parameter information is sent respectively.
If comprise the parameter information of the media control channel of setting number in the described conversation initial request, then described acquisition module 62 is used to obtain the media control channel parameter information of the described media server of same number; The media control channel parameter information that described sending module 63 is used at every turn the described media server of the same number that will obtain returns.
Described acquisition module 62 comprises the session modification unit 64 and second receiving element 65, and wherein, session modification unit 64 is used for revising request to described media server initiation session; Second receiving element 65 is used to receive the parameter information of the media control channel that described media server returns.
Method, system and entity by the embodiment of the invention eight to embodiment 11 descriptions, make terminal obtain the parameter information of the media control channel of a plurality of media servers of needing several times, and the number of the parameter information of each media control channel that obtains satisfy the requirement of SDP.
Obviously, those skilled in the art can carry out various changes and modification to the present invention and not break away from the spirit and scope of the present invention.Like this, if of the present invention these are revised and modification belongs within the scope of claim of the present invention and equivalent technologies thereof, then the present invention also is intended to comprise these changes and modification interior.

Claims (33)

1. the method that session is set up in the IP internet TV system is characterized in that this method comprises:
Terminal sends the conversation initial request to content positioning function entity, comprises the medium component identification in this request;
Described terminal receives the positional information that described content positioning function entity returns, this positional information is: the positional information of at least two media servers at the medium composition place that described sign is corresponding, or known the positional information of content positioning function entity of positional information of at least two media servers at the medium composition place that described sign is corresponding;
Described terminal utilizes the media server at the described positional information medium composition place corresponding with described sign to set up session connection.
2. the method for claim 1 is characterized in that,
If described positional information is the positional information of described content positioning function entity, then terminal obtains the positional information of the media server at the corresponding medium composition place of described sign by described content positioning function entity, and utilizes this positional information to set up session connection with media server respectively;
If described positional information is the positional information of described media server, then the direct media server corresponding with this positional information of terminal set up session connection.
3. the method for claim 1 is characterized in that, described content positioning function entity is business control function body, media control function entity or media delivery functional entity, or the independent community with media server selection function.
4. the method for claim 1 is characterized in that, described positional information returns to terminal by redirect message or notification message Notify.
5. the system that session is set up in the IP internet TV system is characterized in that, the system that this session is set up comprises:
Terminal is used to send the conversation initial request that comprises the medium component identification, receiving position information, and utilize the media server at the described positional information medium composition place corresponding to connect with described sign;
Content positioning function entity, be used to receive described conversation initial request, and return described positional information to described terminal, this positional information is: the positional information of at least two media servers at the medium composition place that described sign is corresponding, or known the positional information of content positioning function entity of at least two media server positional informations at the medium composition place that described sign is corresponding;
Described media server is used for setting up session connection with described terminal.
6. system as claimed in claim 5 is characterized in that, described content positioning function entity is business control function body, media control function entity or media delivery functional entity, or the independent community with media server selection function.
7. system as claimed in claim 5 is characterized in that, if described positional information is the positional information of described content positioning function entity, then
Described content positioning function entity, the media server positional information that is used for the medium composition place that the described sign of having known is corresponding sends to described terminal;
Described terminal is used to utilize the described media server positional information that receives to set up session connection with media server respectively.
8. system as claimed in claim 6 is characterized in that, described positional information is carried by redirect message or notification message Notify.
9. a content positioning function entity is characterized in that, this content positioning function entity comprises:
Receiver module is used to receive the conversation initial request, comprises the medium component identification in this request;
The positional information determination module, the positional information of at least two media servers at the medium composition place that is used for determining that described sign is corresponding, or known the positional information of content positioning function entity of at least two media server positional informations at the medium composition place that described sign is corresponding;
Sending module is used to send the positional information that described positional information determination module is determined.
10. content positioning function entity as claimed in claim 9, it is characterized in that, described content positioning function entity is business control function body, media control function entity or media delivery functional entity, or the independent community with media server selection function.
11. content positioning function entity as claimed in claim 9 is characterized in that described positional information is carried by redirect message or notification message Notify.
12. the method that session is set up in the IP internet TV system is characterized in that this method comprises:
The conversation initial request that content positioning function entity receiving terminal sends comprises the medium component identification in this request;
Described content positioning function entity is determined at least two media servers at the medium composition place that described sign is corresponding, and obtain the media control channel parameter information of described media server, return the local media control channel parameter information that distributes to terminal, there is corresponding relation in the described local media control channel parameter information that distributes with the media control channel parameter information of the media server that obtains.
13. method as claimed in claim 12 is characterized in that, obtains the media control channel parameter information of described media server, and comprises to the process that terminal is returned the local media control channel parameter information that distributes:
Described content positioning function entity obtains the first media control channel parameter information of first media server of determining, and this parameter information is returned to terminal;
Described first media server is set up the control channel parameter information respectively with the remaining media server of determining, and sets up the corresponding relation of this control channel parameter information and the described first media control channel parameter information;
Described remaining media server is meant other media servers except that first media server at least two media servers determining.
14. method as claimed in claim 12 is characterized in that, if described content positioning function entity is a business control function body, then described conversation initial request is by the IP Multimedia System device forwards;
If described content positioning function entity is the media control function entity, then described conversation initial request is transmitted by IP Multimedia System equipment and business control function body.
15. the system that session is set up in the IP internet TV system is characterized in that, the system that this session is set up comprises:
Terminal is used to send the conversation initial request that comprises the medium component identification, and receiving media control channel parameter information;
Content positioning function entity, be used to receive described conversation initial request, determine at least two media servers at the medium composition place that described sign is corresponding, and obtain the media control channel parameter information of described media server, return the local media control channel parameter information that distributes to terminal, there is corresponding relation in the described local media control channel parameter information that distributes with the media control channel parameter information of the media server that obtains.
16. system as claimed in claim 15 is characterized in that,
Described content positioning function entity is used to obtain the first media control channel parameter information of first media server of determining, and this parameter information is returned to terminal;
Described first media server is used for setting up the control channel parameter information respectively with the remaining media server of determining, and sets up the corresponding relation of this control channel parameter information and the described first media control channel parameter information.
17. a content positioning function entity is characterized in that, this content positioning function entity comprises:
Receiver module is used to receive the conversation initial request, comprises the medium component identification in this request;
Acquisition module is used for determining described at least two media servers that identify corresponding medium composition place, and obtains the media control channel parameter information of described media server;
Sending module is used for returning the local media control channel parameter information that distributes to terminal, and there is corresponding relation in the described local media control channel parameter information that distributes with the media control channel parameter information of the media server that obtains.
18. content positioning function entity as claimed in claim 17 is characterized in that, described content positioning function entity is business control function body, media control function entity or media delivery functional entity.
19. content positioning function entity as claimed in claim 18 is characterized in that, if this content positioning function entity is the media delivery functional entity, then described acquisition module comprises:
Performance element is used for the media control channel parameter information of self is sent to described sending module;
Set up the unit, be used for setting up the control channel parameter information respectively with remaining media server, and set up this control channel parameter information and described self the corresponding relation of media control channel parameter information, described remaining media server is meant other media servers except that self at least two media servers determining.
20. the method that session is set up in the IP internet TV system is characterized in that this method comprises:
Terminal sends the conversation initial request to content positioning function entity, comprises the medium component identification in this request;
Described content positioning function entity obtains the media control channel parameter information of at least two media servers at the corresponding medium composition place of described sign respectively, and described parameter information is returned to terminal respectively.
21. method as claimed in claim 20 is characterized in that, the process of obtaining and return the media control channel parameter information of described media server respectively comprises:
If comprise the parameter information of the media control channel of setting number in the described conversation initial request, then described content positioning function entity obtains and returns the media control channel parameter information of the described media server of same number.
22. method as claimed in claim 21 is characterized in that, at least twice process of obtaining and return the media control channel parameter information of same number comprises:
Described content positioning function entity is revised request to described media server initiation session, and this media server returns the parameter information of media control channel to described content positioning function entity.
23. method as claimed in claim 22 is characterized in that, described session modification request is the updating message SIPUpdate carrying by the SIP reInvite of invitation message again of conversation initialized protocol or conversation initialized protocol.
24. the system that session is set up in the IP internet TV system is characterized in that, the system that this session is set up comprises:
Terminal is used to send the conversation initial request, comprises the medium component identification in this request, and receiving media control channel parameter information;
Content positioning function entity is used for obtaining respectively the described media control channel parameter information that identifies at least two media servers at corresponding medium composition place, and described parameter information is returned to terminal respectively.
25. system as claimed in claim 24 is characterized in that,
If comprise the parameter information of the media control channel of setting number in the described conversation initial request, then
Described content positioning function entity is used to obtain and return the media control channel parameter information of the described media server of same number.
26. system as claimed in claim 25 is characterized in that, described system also comprises media server, then when the media control channel parameter information of same number is obtained and returns at least twice requirement,
Described content positioning function entity is used for revising request to described media server initiation session;
Described media server is used for returning to described content positioning function entity the parameter information of media control channel.
27. system as claimed in claim 26 is characterized in that, described session modification request is the updating message SIPUpdate carrying by the SIP reInvite of invitation message again of conversation initialized protocol or conversation initialized protocol.
28. system as claimed in claim 24 is characterized in that, described content positioning function entity is business control function body or media control function entity.
29. a content positioning function entity is characterized in that, this content positioning function entity comprises:
First receiver module is used to receive the conversation initial request, comprises the medium component identification in this request;
Acquisition module is used for obtaining respectively the described media control channel parameter information that identifies at least two media servers at corresponding medium composition place;
Sending module is used for described parameter information is sent respectively.
30. content positioning function entity as claimed in claim 29 is characterized in that, if comprise the parameter information of the media control channel of setting number in the described conversation initial request, then
Described acquisition module is used to obtain the media control channel parameter information of the described media server of same number;
Described sending module, the media control channel parameter information that is used at every turn the described media server of the same number that will obtain sends.
31. content positioning function entity as claimed in claim 30 is characterized in that described acquisition module comprises:
The session modification unit is used for revising request to described media server initiation session;
Second receiving element is used to receive the parameter information of the media control channel that described media server returns.
32. content positioning function entity as claimed in claim 31 is characterized in that, described session modification request is the updating message SIP Update carrying by the SIP reInvite of invitation message again of conversation initialized protocol or conversation initialized protocol.
33. content positioning function entity as claimed in claim 29 is characterized in that, described content positioning function entity is business control function body or media control function entity.
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