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WO2009049518A1 - Procédé, système et entité d'établissement de session de système de télévision par internet ip - Google Patents

Procédé, système et entité d'établissement de session de système de télévision par internet ip Download PDF

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Publication number
WO2009049518A1
WO2009049518A1 PCT/CN2008/072430 CN2008072430W WO2009049518A1 WO 2009049518 A1 WO2009049518 A1 WO 2009049518A1 CN 2008072430 W CN2008072430 W CN 2008072430W WO 2009049518 A1 WO2009049518 A1 WO 2009049518A1
Authority
WO
WIPO (PCT)
Prior art keywords
media
session
parameter information
function entity
control channel
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/CN2008/072430
Other languages
English (en)
Chinese (zh)
Inventor
Jincheng Li
Youying Li
Feng Wang
Jun Yan
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Huawei Technologies Co Ltd
Original Assignee
Huawei Technologies Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Huawei Technologies Co Ltd filed Critical Huawei Technologies Co Ltd
Publication of WO2009049518A1 publication Critical patent/WO2009049518A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • 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

Definitions

  • the present invention relates to data transmission technologies in the field of communications, and in particular, to a method, system and entity for session establishment in an IP internetworking television system.
  • IMS is a subsystem superimposed on the existing packet domain in the Wide-band Code Division Multiple Access (WCDMA) network added in the 3GPP R5 phase, using the packet domain as its upper layer control signal.
  • WCDMA Wide-band Code Division Multiple Access
  • the bearer channel of the media transmission is introduced into the Session Initiated Protocol (SIP) as a service control protocol, and the SIP protocol is simple, easy to expand, and the media combination is convenient, so that the service control and the bearer control are separated, and the rich multimedia is provided. business.
  • SIP Session Initiated Protocol
  • IMS The main functional entities of IMS include Call Session Cobtrol Function (CSCF), which controls functions such as user registration and session control, and Application Server (AS), which provides various business logic control functions, and centrally manages user subscription data.
  • HSS Home Subscriber Server
  • MGCF/IM-MGW Media Gateway Control Function/Media Gateway
  • S-CSCF The Domain Service Node
  • the IMS based IPTV service makes full use of the existing registration, authentication, routing, session control and establishment, service triggering in the IMS network. Charging and end-to-end Quality of Service (QoS) guarantees and other mechanisms to provide users with streaming services, streaming media and real-time session services.
  • QoS Quality of Service
  • the IMS based IPTV service functional architecture defined by the current Next Generation Network Communications and Internet Converged Services and Protocols (TISPAN) is shown in Figure 1.
  • the IPTV Media Functions (MF) is responsible for the control and delivery of UE media streams. ). It is functionally interpreted as a Media Control Function (MCF) and a Media Delivery Function (MDF).
  • MCF Media Control Function
  • MDF Media Delivery Function
  • Real-time Transport Protocol/Real Time Transport Control Protocol RTP/RTCP
  • SDP Service Data Point
  • RTSP Real-Time Streaming Protocol
  • DNS Domain Name Server
  • different media components of the same media component may be provided by different providers and distributed across different media servers.
  • a movie content it may be combined with multiple languages such as English, Chinese, French, German, Japanese, etc.
  • audio files audio
  • video files video
  • media control channels such as RTSP connections
  • content delivery channels such as RTP connections
  • the terminal device UE can obtain the media description information of the media server where the requested media component is located by using an electronic program guide (EPG), and the media description information includes the address of the media server. Information, and then establish a connection between the UE and the media server by means of an RTSP Uniform Resource Identifier (RTSP URI).
  • EPG electronic program guide
  • RTSP URI Uniform Resource Identifier
  • a UE exists as an IPTV terminal, which may be a PC, a TV, a set top box, or a mobile terminal, and a user can watch an IPTV program through the UE.
  • the UE sends the SIP message including the media component identifier to the service control function (SCF) through the IMS device (IMS CORE), where the SCF is an application server that provides the CoD service, and is responsible for the control of the service logic (service authorization, accounting Fees and business controls, etc.).
  • the IMS CORE sends a SIP message to the MF, which sends the media component to the UE.
  • the MF exists as a media server of the CoD service media component, and can be logically divided into MCF and MDF, wherein the MCF is responsible for media control and the MDF is responsible for media component delivery.
  • the MCF After receiving the SIP message, the MCF instructs the MDF to establish an RTSP connection with the UE, and sends the media stream to the UE through the RTP/RTCP.
  • the terminal needs to know the distribution of each media component of the media component through the media description information (such as when the media components are distributed on one media server or multiple media servers), thereby determining the number of connections to be established.
  • the MF positioning process is introduced in the TISPAN regulations, so the terminal cannot know in advance whether the components of the requested media component are located on the same media server or on different servers.
  • Control channel such as an RTSP
  • the network side finds that the audio and video data are located on different media servers, and needs to return two media control channels (such as two RTSPs) to the terminal in the response response.
  • the terminal implements session establishment. However, returning to the two media control channels violates the SDP principle and cannot perform the normal processing. There is currently no solution to this problem.
  • the embodiment of the invention provides a method, a system and an entity for establishing a session in an IP internet TV system, so as to solve the problem that the terminal cannot be used when the media component is located in different servers in the prior art.
  • the problem of the media server establishing a session connection is not limited to, but not limited to, but not limited to, but not limited to, but not limited to, but not limited to, IP internet TV system, IP internet TV system, IP internet TV system, so as to solve the problem that the terminal cannot be used when the media component is located in different servers in the prior art.
  • the problem of the media server establishing a session connection.
  • a method for establishing a session in an IP internet TV system comprising:
  • the terminal sends a session initial request to the content locating function entity, where the request includes a media component identifier;
  • the terminal receives the location information returned by the content locating function entity, where the location information is: location information of at least two media servers where the media component corresponding to the identifier is located, or location information of the learned functional entity;
  • the terminal establishes a session connection by using the location information and a media server where the media component corresponding to the identifier is located.
  • a system for session establishment in an IP internet TV system comprising:
  • a terminal configured to send a session initial request that includes a media component identifier, receive location information, and use the location information to establish a connection with a media server where the media component corresponding to the identifier is located; and a content positioning function entity, configured to receive the session Initially requesting, and returning the location information to the terminal, where the location information is: location information of at least two media servers where the media component corresponding to the identifier is located, or at least the media component corresponding to the identifier is located Location information of the content locating function entity of the two media server location information;
  • the media server is configured to establish a session connection with the terminal.
  • a content locating functional entity including:
  • a receiving module configured to receive a session initial request, where the request includes a media component identifier, and a location information determining module, configured to determine location information of at least two media servers where the media component corresponding to the identifier is located, or the identifier is known Position information of the content locating function entity of the at least two media server location information where the corresponding media component is located;
  • a sending module configured to send the location information determined by the location information determining module.
  • a method for establishing a session in an IP internet TV system comprising:
  • the content locating function entity receives a session initial request sent by the terminal, where the request includes a media And identifying the media control channel parameter information of the media server, and returning the media control channel parameter information corresponding to the parameter information to the terminal.
  • a system for session establishment in an IP internet TV system comprising:
  • a terminal configured to send a session initial request including a media component identifier, and receive media control channel parameter information
  • a content locating function entity configured to receive the initial session request, determine at least two media servers where the media component corresponding to the identifier is located, and obtain media control channel parameter information of the media server, and the parameter information exists The media control channel parameter information of the corresponding relationship is returned to the terminal.
  • a content locating functional entity including:
  • a receiving module configured to receive a session initial request, where the request includes a media component identifier, and obtain media control channel parameter information of the media server;
  • a sending module configured to send media control channel parameter information that has a correspondence relationship with the obtained parameter information.
  • a method for establishing a session in an IP internet TV system comprising:
  • the terminal sends a session initial request to the content locating function entity, where the request includes a media component identifier; media control channel parameter information of the media servers, and returns the parameter information to the terminal respectively.
  • a system for session establishment in an IP internet TV system comprising:
  • a terminal configured to send a session initial request, where the request includes a media component identifier, and receives media control channel parameter information;
  • the media of the two media servers control channel parameter information, and return the parameter information to the terminal respectively.
  • a content locating functional entity including:
  • a first receiving module configured to receive a session initial request, where the request includes a media component identifier; and media control channel parameter information of the server;
  • a sending module configured to separately return the parameter information.
  • the location information of the media server is returned to the terminal, or the parameter information corresponding to the parameter of the media control channel of the media server, or the parameter information of the media control channel of the media server is returned to the media server multiple times.
  • the terminal implements a session connection with each media server on the basis of the SDP-compliant processing principle.
  • FIG. 1 is a schematic diagram of a service function architecture of a TV based on an IP internet in the prior art
  • FIG. 2 is a schematic structural diagram of a system for establishing a session in an IPTV system according to Embodiment 1 of the present invention
  • FIG. 3 is a signaling diagram of Embodiment 2 of the present invention; Schematic diagram of the process;
  • FIG. 4 is a schematic structural diagram of a content positioning function entity in Embodiment 3 of the present invention.
  • Embodiment 4 is a schematic flowchart of signaling in Embodiment 4 of the present invention.
  • Embodiment 6 is a schematic flowchart of signaling in Embodiment 5 of the present invention.
  • FIG. 7 is a schematic structural diagram of a system in Embodiment 6 of the present invention.
  • Embodiment 8 is a schematic structural diagram of a content positioning function entity in Embodiment 7 of the present invention.
  • Embodiment 8 of the present invention is a schematic flowchart of signaling in Embodiment 8 of the present invention.
  • Embodiment 9 is a schematic flowchart of signaling in Embodiment 9 of the present invention.
  • FIG. 11 is a schematic structural diagram of a system in Embodiment 10 of the present invention.
  • FIG. 12 is a schematic structural diagram of a content positioning function entity in Embodiment 11 of the present invention.
  • the network side will return the location information of the media server to the terminal to implement the establishment of the session; or the manner of returning the media control channel parameter information of the media server to the terminal by using multiple manners on the network side. , to achieve the establishment of the session.
  • FIG. 2 it is a schematic structural diagram of a system for establishing a session in an IPTV system according to Embodiment 1 of the present invention.
  • the system includes a terminal 11, a content positioning function entity 12, and a media server 13, wherein the terminal 11 is configured to send a media component. Identifying a session initial request, receiving location information, and establishing, by using the location information, a connection with a media server 13 where the media component corresponding to the identifier is located; the content location function entity 12 is configured to receive the session initial request, and Terminal 11 returns the
  • the number of the media servers 13 is at least two, for establishing a session connection with the terminal 11.
  • the content locating function entity 12 is configured to send the media server location information of the media component corresponding to the identified identity to the terminal 11;
  • the terminal 11 is configured to establish a session connection with the media server 13 by using the received media server location information.
  • the system further includes an IMS device 14 for forwarding the session initiation request sent by the terminal 11 to the content location function entity 12.
  • the content locating function entity may be an SCF, an MCF, or an MDF, or an independent entity having a media server selection function independent of the SCF, the MCF, and the MDF, and the so-called media server selection function. It can be a function that determines the media server where the media component is located.
  • the location information is returned to the terminal by using a redirect message or a notification message (Notify). Specifically, it may be carried by the redirect message or the header field of Notify, or the message body attribute line.
  • the media component generally includes an audio media component, a video media component, and a text media component (subtitle).
  • the set media component includes an audio media component and a video media component, and the two media The components are distributed across different media servers.
  • a second embodiment of the present invention provides a method for establishing a session in an IPTV system corresponding to the system in the first embodiment.
  • FIG. 3 it is a schematic diagram of a signaling process of the method, where the process mainly includes the following steps:
  • Step 301 The terminal initiates a session initial request to the IMS CORE, where the request includes the requested media component identifier.
  • the media component identifier may be carried by a Uniform Resource Identifier Request message (Request URI), which may be SIP: movie@SCF.com, which identifies the media component requested by the terminal.
  • Request URI Uniform Resource Identifier Request message
  • Step 302 The IMS CORE sends the received initial session request to the content location function entity.
  • the session initial request may also be forwarded by other entities to the content location function entity, not limited to the IMS CORE.
  • the content locating function entity may be an SCF, an MCF, or an MDF, or an independent entity having a media server selection function independent of the SCF, the MCF, and the MDF.
  • the content locating function entity is set. For SCF.
  • the session initial request described in steps 301 and 302 may carry an audio RTP media transmission channel, a video RTP media transmission channel, and an RTSP media control channel, wherein the media control channel simultaneously controls the audio and video media transmission channels.
  • the parameter information of these channels may be included in the SDP Offer or may be carried through the signaling header field, such as the SIP header field and the RTSP header field. This embodiment is taken as an example in the SDP Offer, and its representation can be as follows:
  • At least two media servers At least two media servers.
  • the SCF determines, based on the received media component identification, that the audio media component in the media component is located in the media server A (e.g., a media server controlled by the MCF1), and the video media component is located in the media server B (e.g., a media server controlled by the MCF2).
  • the media server A e.g., a media server controlled by the MCF1
  • the video media component is located in the media server B (e.g., a media server controlled by the MCF2).
  • Step 304 The content location function entity returns location information of the media server to the terminal, or returns location information of the content location function entity that has learned the location information of the media server to the terminal.
  • the SCF returns an initial session response message to the terminal, where the response message includes the location information of the media server A and the location information of the media server B, indicating that different media components are stored on different media servers; or the learned message is included in the response message.
  • the location information of the server A and the location information of the SCF of the location information of the media server B are included in the response message.
  • the location information may be logical location information or physical location information.
  • the logical location information refers to: location information of a content location function entity responsible for processing different media components; physical location information refers to: location information of a media server where different media components are located, and the terminal directly uses the physical location information to establish with the corresponding media server. connection.
  • the logical location information of media component A is: SIP: audio.movie@SCF.com
  • the logical location information of media component B is: SIP: video.movie@SCF.com.
  • the physical location information may be a SIP URI.
  • the physical location information of the media component A is: SIP: audio.movie@MFl.com
  • the physical location information of the media component B is: SIP: video.movie@MF2.com
  • physical location The information can also be an RTSP URI, for example
  • the physical location information of the media component A is: RTSP://MRcom/movie/audio
  • the logical location information of the media component B is: RTSP://MRcom/movie/video.
  • the logical location information of the media component A is: SIP: audio.movie@MCF.com
  • the logical location information of the media component B is: SIP: video.movie@MCF.com
  • the physical location information of the media component A is: SIP: audio, mo vie @MDF1.com
  • the physical location information of the media component B is: SIP: video.movie@MDF2.com
  • the physical location information of the media component A is: RTSP://MDRcom/movie/audio
  • the logical location information of media component B is: RT SP ://MDF. com/movie/video.
  • the initial session response message can be implemented by a SIP 3XX redirect message, including but not limited to a multiple select message (300 message). It can also be implemented by other response messages, such as 183 temporary response messages.
  • the SIP Content-Disposition header field can be extended, such as set to "Redirect” or some other flag, indicating how the terminal parses the message body, or the content in the message header field.
  • the location information can be returned to the terminal through the SIP channel.
  • the specific return mode can pass the 3xx message or the lxx message as described above.
  • location information can be returned to the terminal in a variety of possible ways, such as via a Subscribe/Notify message. Or use the Option method, or extend a new SIP method, or message.
  • Step 305 The terminal establishes a session connection with the media server that stores the media component according to the location information.
  • a session establishment request is initiated according to the logical location information, and the request is sent through the SCF to establish a session connection with the media server A where the audio media component is located and the media server B where the video media component is located.
  • the SCF carries the logical location information in the Request URI in the session establishment request, and the SCF informs the terminal of the location information of the known media server A and the media server B.
  • the media server A and the media server B respectively carry the information through the SCF.
  • the SDP Answer of the media control channel information and the media transmission channel information corresponding to the audio, the media control channel parameter information corresponding to the video, and the media transmission channel parameter information are returned to the terminal.
  • the terminal When the location information received by the terminal is physical location information, the terminal directly establishes a session connection with the media server A and the media server B according to the physical location information, and after the session connection is established, the media server A and the media server B directly return to the terminal. Parameter information for each channel.
  • the SCF is used as the content positioning function entity.
  • the above process is also applicable to the case where the MCF is used as the content positioning function entity.
  • the initial session response message returned by the MCF to the terminal includes the location information of each MDF or the location information of each MDF.
  • the location information of the MCF the terminal establishes a session connection with the corresponding MDF according to the location information. This method is especially useful when the MCF does not support aggregate control.
  • Embodiment 3 of the present invention also mentions A content locating function entity, as shown in FIG. 4, includes a receiving module 21, a location information determining module 22, and a sending module 23, wherein the receiving module 21 is configured to receive a session initial request including a media component identifier; 22: determining location information of at least two media servers where the media component corresponding to the identifier is located, or location information of a content positioning function entity that has learned at least two media server location information where the media component corresponding to the identifier is located; The sending module 23 is configured to send the location information determined by the location information determining module 22.
  • the location information is carried by a redirect message or Notify. Further, it is carried by the redirect message or the header field of Notify, or the message body attribute line.
  • the content locating function entity described in this embodiment may also be an SCF, an MCF, or an MDF, or an independent entity having a media server selection function.
  • the content locating function entity directly or indirectly returns the location information of the media server storing the media components to the terminal, and the terminal establishes a session connection according to the location information, so that the terminal implements multiple media.
  • the session connection of the server is established, and the session connection is established through the location information of the media server, which avoids the problem that the number of requested media control channels and the number of control channels establishing the connection does not match, and conforms to the SDP processing principle.
  • the content positioning function entity may establish a connection with the media server that stores the media component, that is, establish a plurality of media control channels, and return a set number (such as a parameter) corresponding to the media control channel to the terminal.
  • Information the parameter information has a correspondence relationship with the content positioning function entity and parameter information of several established media control channels.
  • FIG. 5 it is a schematic diagram of a signaling flow in Embodiment 4 of the present invention.
  • the audio component in the requested media component is also located in the media server A, and the video component is located in the media server B.
  • the method includes :
  • Step 501 The terminal initiates a session initial request to the IMS CORE, where the request includes the requested media component identifier.
  • the session initial request may carry an audio media delivery channel, a video media delivery channel, and a media control channel.
  • Step 502 The IMS CORE sends the received initial session request to the content location function entity.
  • Step 501 and step 502 are similar to steps 301 and 302 previously described.
  • Step 503 The content positioning function entity determines, according to the media component identifier, that the media components of the media component are located in the media server A and the media server B, respectively.
  • Step 504 The content positioning function entity establishes a session connection with the media server A, and obtains media control channel parameter information of the media server A.
  • the content positioning function entity may also be set to be an SCF.
  • the SCF initiates a session initial request to the media server A, where the SDP Offer carries media control channel parameter information (RTSP channel parameter information) and media transmission channel parameter information (RTP channel parameter information).
  • the media control channel parameter information is local to the SCF, and the media transmission channel parameter information is parameter information corresponding to the audio media component carried in the session initiation request initiated by the terminal.
  • the initial session request in this step can be implemented by SIP Invite.
  • Media Server A returns the initial session response to the SCF, which can be done via SIP 200 OK or SIP 183.
  • step 504 the SCF and the media server A establish an audio media transmission channel and an audio media control channel, that is, the SCF obtains control channel parameter information and transmission channel parameter information corresponding to the media server A.
  • Step 505 The content positioning function entity establishes a session connection with the media server B, and obtains media control channel parameter information of the media server B.
  • step 505 is similar to step 504.
  • the SCF and the media server B establish a video media transmission channel and a video media control channel.
  • the processing of the SCF in steps 504 and 505 is similar to the Forking process in the traditional session service.
  • Step 506 The content positioning function entity returns a session initial response to the terminal, where the response includes media control channel parameters, the parameter and content positioning function entity and media server A, and media service. There is a corresponding relationship between the media control channel parameters between the devices B.
  • the SCF After receiving the initial session response returned by the media server A and the media server B, the SCF does not directly return the parameters of the two media control channels to the terminal, but locally allocates a media control channel parameter by the SCF, and steps 504 and 505.
  • the parameters of the two media control channels obtained in the medium are associated with each other, and the media control channel parameters allocated by the SCF are returned to the terminal, thereby avoiding the number of media control channels and the received media control included in the initial request of the terminal initiation session.
  • the number of channels is not equal, and in the future, a session connection can be established with the media server A and the media server B through the SCF.
  • Step 506 A media control channel parameter information locally allocated by the SCF, an audio medium Transmit channel parameter information and a video media transfer channel parameter information.
  • step 504 the process of returning a response message is implemented according to the message type received by the SCF in step 504 and step 505 by selecting SIP 200 OK or SIP 183.
  • the terminal establishes a session connection with the media server A and the media server B through the content locating function entity, and can implement the IPTV service.
  • the media control channel parameter information corresponding to the media server is directly returned to the terminal, and at this time, the media corresponding to the media server by the content positioning function entity can still be regarded as The parameter information with the same content corresponding to the control channel parameter information is returned to the terminal.
  • the initial request of the session sent by the terminal further includes the parameter information of the media control channel, and the number of the media control channels corresponding to the parameter information is one
  • the number of media control channels corresponding to the parameter information returned to the terminal is also one.
  • the parameter information returned to the terminal corresponds to parameter information of multiple media control channels.
  • the number of media control channels corresponding to the parameter information included in the session initial request sent by the terminal is two
  • the number of media control channels corresponding to the parameter information returned to the terminal is also two
  • one of the media corresponding to the part of the media server Control channel parameter information another The bar corresponds to the parameter information of the media control channel of the remaining media server.
  • the case when it is larger than two is similar to the above.
  • the steps in the fourth embodiment are also applicable to the case where the MCF is used as the content positioning function entity.
  • the MCF finds that the audio component and the video component are distributed on different MDFs, the RTSP media control channel information is allocated, and media control is established respectively with each MDF.
  • Channel the media control channel is not limited to RTSP, but also H.248, or SIP, depending on the specific implementation of the VCR command
  • the parameter information and assigned RTSP of the media control channel with the audio and video MDF.
  • the terminal can implement the IPTV service.
  • the terminal can directly control the two MDFs according to the allocated RTSP media control channel.
  • the fifth embodiment of the present invention further provides a method for the terminal to directly control the MDF1 and indirectly control the MDF2.
  • the content positioning function entity is an MCF. As shown in FIG. 6, the method steps include:
  • Step 601 The terminal initiates a session initial request to the IMS CORE, where the request includes the requested media component identifier.
  • the session initial request may carry an audio media delivery channel, a video media delivery channel, a text media delivery channel, and a media control channel.
  • Step 602 The IMS CORE sends the received initial session request to the SCF.
  • Step 601 and step 602 are similar to steps 301 and 302 previously described.
  • Step 603 The SCF sends the session initial request to the MCF.
  • Step 604 The MCF queries, according to the media component identifier, that the media components of the media component are located at MDF1, MDF2, and MDF3, respectively.
  • the audio component is set to MDF1
  • the video component is located at MDF2
  • the text component is located at MDF3.
  • Step 605 The MCF establishes a session connection with the MDF1.
  • the voice connection that is, the MCF obtains audio media transmission channel parameter information, such as RTP channel parameter information, audio media control channel parameter information, such as RTSP channel parameter information.
  • the parameter information may include the IP address and/or port information of the corresponding channel.
  • the communication protocol of the MCF and the MDF may be one or any combination of H.248, RTSP or SIP protocols.
  • Step 606 The MCF establishes a video media transmission channel with the MDF2.
  • MCF obtains video media transmission channel parameter information, such as RTP channel parameter information.
  • the communication protocol of MCF and MDF can be one or any combination of H.248, RTSP or SIP protocols.
  • the MCF can also temporarily not contact MDF2, as shown by the dotted line in the figure.
  • Step 607 The MCF establishes a text media transmission channel with the MDF3.
  • This step is similar to step 606 and does not have to exist.
  • the MCF can also temporarily not contact MDF3.
  • Step 608 The MDF1 establishes a control channel with the MDF2 and the MDF3, and establishes a correspondence between the parameter information of the control channel and the parameter information of the audio media control channel.
  • the MCF notifies the MDF1 to establish a control channel with the MDF2 and the MDF3, and the audio media control channel negotiated in the above step 605 is simultaneously used to control the media components corresponding to the MDF2 and the MDF3. That is, when the MDF1 receives the message of the audio media control channel negotiated in the above step 605, such as fast forward, fast reverse, etc., the MDF1 determines the control channel parameter information between the MDF2 and the MDF3 according to the established correspondence, and controls the MDF2.
  • the video media component performs the same operation as the text content of MDF3; or, MDF1 acquires the content in MDF2 and MDF3, and concentrates the distributed media components on one media server, and then MDF1 obtains the video media component from MDF2 and MDF3 and provides it to the terminal. .
  • step 606 and step 607 can be implemented independently, or together with step 605; if step 606 and step 607 do not exist, this step is also used to implement the functions in step 606 and step 607.
  • the communication protocol of the MCF and the MDF may be one or any combination of H.248, RTSP or SIP protocols.
  • Step 609 The MCF returns a session initial response to the terminal, where the response includes audio media control channel parameter information.
  • the SDP Answer in the initial session response in this step carries information corresponding to the media component in the session initial request in step 601: a media control channel parameter information, an audio media transmission channel parameter information, a video media transmission channel parameter information, and a Text media transfer channel parameter information.
  • the information is the media transmission channel parameter information corresponding to MDF3. If there is no step 606 and step 607, the media transmission channel parameter information corresponding to MDF2 and MD3 may be invalid information.
  • the initial response of this session is forwarded to the terminal through the SCF and IMS CORE, which can be implemented via SIP 200 OK or SIP 183.
  • the terminal When the terminal establishes a session connection with the MCF according to the parameter information in the received response, the terminal has an intermediate message interaction, such as ACK, PRACK, etc., and details are not described herein.
  • an intermediate message interaction such as ACK, PRACK, etc.
  • the system includes a terminal 31 and a content locating function entity 32, wherein the terminal 31 is configured to send the media component identifier.
  • the content locating function entity 32 is configured to receive the session initial request, determine at least two media servers where the media component corresponding to the identifier is located, and obtain the media server
  • the media controls the channel parameter information, and returns the media control channel parameter information corresponding to the parameter information to the terminal 31.
  • the system further includes at least two media servers 33, wherein the content locating function entity 32 is configured to obtain the determined first media control channel parameter information of the first media server 33, and return the parameter information to the terminal 31;
  • the first media server 33 is configured to use the determined remaining media service
  • the server respectively establishes control channel parameter information, and establishes a correspondence between the control channel parameter information and the first media control channel parameter information.
  • the system also includes an IP Multimedia Subsystem device 34 for forwarding the Session Initiation Request sent by the terminal 31 to the Content Location Function Entity 32.
  • the content location function entity 32 is an SCF, an MCF or an MDF.
  • the IP multimedia subsystem device 34 is configured to forward the session initial request sent by the terminal to the SCF; and the SCF is configured to forward the session initial request to the MCF.
  • the content locating function entity described in the seventh embodiment of the present invention corresponds to the fourth embodiment to the sixth embodiment.
  • the entity includes a receiving module 41, an obtaining module 42 and a sending module 43.
  • the receiving module 41 is used by the receiving module 41.
  • Receiving a session initial request the request includes a media component identifier; obtaining the media control channel parameter information of the media server; the sending module 43 is configured to send the media control channel parameter information corresponding to the acquired parameter information .
  • the obtaining module 42 includes an executing unit 44 and an establishing unit 45, wherein the executing unit 44 is configured to send its own media control channel parameter information to the sending module 43; And establishing control channel parameter information with the remaining media servers, and establishing a correspondence between the control channel parameter information and the parameter information of the media control channel of the self.
  • the method, the system, and the content locating function entity described in the seventh embodiment of the present invention avoid the return of multiple media control channel parameter information, and establish a corresponding relationship, so that the terminal can utilize the received media control.
  • the channel parameter information controls multiple media control channel parameter information, and the session process is successfully established.
  • the terminal obtains the media server channel control channel parameter information by using the content location function entity multiple times and returns to the terminal.
  • the steps include:
  • Step 901 The terminal initiates a session initial request to the IMS CORE, where the request includes the requested media component identifier.
  • the session initial request may carry an audio media delivery channel, a video media delivery channel, and a media control channel.
  • Step 902 The IMS CORE sends the received initial session request to the content location function entity.
  • Step 901 and step 902 are similar to the foregoing steps 301 and 302.
  • Step 903 The content positioning function entity determines, according to the media component identifier, that the media components of the media component are located in the media server A and the media server B, respectively.
  • Step 904 The content location function entity establishes a session connection with the media server A.
  • the content positioning function entity may also be set to be an SCF.
  • the SCF initiates a session initial request to the media server A, where the SDP Offer carries media control channel parameter information (RTSP channel parameter information) and media transmission channel parameter information (RTP channel parameter information).
  • the media control channel parameter information is the media control channel parameter information carried in the terminal request
  • the media transmission channel parameter information is parameter information corresponding to the audio media component carried in the initial session request initiated by the terminal.
  • the initial session request in this step can be implemented by SIP Invite.
  • Media Server A returns the initial session response to the SCF, which can be done via SIP 200 OK or SIP 183.
  • step 904 the SCF and the media server A establish an audio media transmission channel and an audio media control channel.
  • Step 905 The content positioning function entity establishes a video media transmission channel with the media server A.
  • the SDP Offer carries the media transmission channel parameter information (RTP channel parameter information), and the media transmission channel parameter information is parameter information corresponding to the video media component carried in the session initiation request initiated by the terminal.
  • RTP channel parameter information the media transmission channel parameter information
  • the media transmission channel parameter information is parameter information corresponding to the video media component carried in the session initiation request initiated by the terminal.
  • the existence of step 905 is optional, as indicated by the dotted line in the figure.
  • the audio media transmission channel and the audio media control channel are first established, or the video media transmission channel and the video media control channel are first established. Also optional.
  • Step 906 The content positioning function entity returns a session initial response to the terminal, where the response includes audio media control channel parameter information.
  • the SDP Answer in the initial session response carries information corresponding to the media component in the session initial request in step 901: a media control channel parameter information, an audio media transmission channel parameter information, and a video media transmission channel parameter information.
  • the media control channel parameter information is the corresponding media control channel parameter information on the media server A;
  • the audio media transmission channel parameter information is the corresponding media delivery channel information on the media server A;
  • the transmission channel parameter information is the corresponding media transmission channel information on the media server B.
  • the video media transmission channel parameter information may be a parameter information arbitrarily constructed by the SCF, for example, the address in the parameter information is filled in as 0.0.0.0. , the port is arbitrary.
  • the process of returning a response message is implemented according to the message type received by the SCF in step 904 and step 905 by selecting SIP 200 OK or SIP 183.
  • the terminal has an intermediate message interaction, such as a response response message (ACK), a temporary reliable response (PRACK), etc., when the terminal establishes a session connection with the media server according to the parameter information in the received initial session response, Let me repeat.
  • ACK response response message
  • PRACK temporary reliable response
  • Step 907 The content positioning function entity establishes a video media control channel with the media server B, and returns the control channel parameter information to the terminal.
  • the terminal may initiate a request to establish a video media control channel with the media server B
  • the SCF may initiate a request to establish a video media control channel with the media server B.
  • the SCF initiates a session modification request to the media server B, and requests the media server B to establish a video media control channel, and the media server B returns a session modification response message to the SCF, and the response message is
  • the SCF obtains parameter information of the media control channel corresponding to the media server B, and returns the parameter information to the terminal through the session modification request.
  • the terminal After receiving the parameter information of the media control channel corresponding to the media server B, the terminal returns a session tampering response to the SCF.
  • the session modification request can be implemented by a session re-invitation message of the session initiation protocol (SIP relnvite) or a session initiation protocol update message (SIP Update) message.
  • SIP relnvite session initiation protocol
  • SIP Update session initiation protocol update message
  • the SCF initiates a session initial request to the media server B, and requests the media server B to establish a video media control channel and a video media transmission channel, and the media server B returns a session initial response message to the SCF, and the response message is
  • the SCF obtains the parameter information of the media control channel corresponding to the media server B and the parameter information of the media transmission channel, and returns the parameter information to the terminal through the session modification response message.
  • the initial session request can pass the SIP Invite message.
  • the terminal initiates the request as an example, the terminal initiates a session modification request to the SCF, and the SCF returns the video media control channel parameter information corresponding to the media server B to the terminal according to the situation that the SCF initiates the request.
  • the terminal when the terminal establishes a session connection with the media server B according to the parameter information in the received response, the terminal has an intermediate message interaction, such as ACK, PRACK, etc., and is not described here.
  • an intermediate message interaction such as ACK, PRACK, etc.
  • the media control channel parameter information returned to the terminal is only corresponding to one media control channel, but can also be regarded as returning the parameter information with the same content corresponding to the media control channel parameter information acquired by the SCF to the terminal. .
  • the media control channel parameter information corresponding to the third media server is obtained according to the method of step 907 of the embodiment.
  • the content positioning function entity after the step 906, the content positioning function entity returns the parameter information of the audio media control channel corresponding to the media server A to the terminal, and may not return the location information of the media server B.
  • the party described by the terminal according to the second embodiment Establish a session connection with Media Server B.
  • the eighth embodiment is to implement the present invention by using the SCF as a content locating function entity.
  • the MCF is used as a content locating function entity as an example.
  • the method includes the following steps: Step 1001: Terminal to IMS The CORE initiates a session initial request containing the requested media component identifier.
  • the session initial request may carry an audio media delivery channel, a video media delivery channel, and a media control channel.
  • Step 1002 The IMS CORE sends the received initial session request to the SCF.
  • Step 1001 and step 1002 are similar to the foregoing steps 301 and 302.
  • Step 1003 The SCF sends the session initial request to the MCF.
  • Step 1004 The MCF determines, according to the media component identifier, that the media components of the media component are located at MDF1 and MDF2, respectively.
  • the set audio component is located at MDF1 and the video component is located at MDF2.
  • Step 1005 The MCF establishes a session connection with MDF1.
  • the media delivery session is controlled between the MCF and the MDF1, and a session connection is established between the MCF and the MDF1, that is, the MCF obtains audio media transmission channel parameter information, such as RTP channel parameter information, media control channel parameter information, such as RTSP channel parameter information.
  • the parameter information may include the IP address and/or port information of the corresponding channel.
  • the communication protocol of the MCF and the MDF may be one or any combination of H.248, RTSP or SIP protocols.
  • Step 1006 The MCF establishes a video media transmission channel with the MDF2.
  • MCF obtains video media transmission channel parameter information, such as RTP channel parameter information.
  • the communication protocol of MCF and MDF can be one or any combination of H.248, RTSP or SIP protocols.
  • Step 1007 The MCF returns a session initial response to the terminal, where the response includes audio media control channel parameter information.
  • the SDP Answer in the initial session response in this step carries information corresponding to the media component in the session initial request in step 1001: a media control channel parameter information, an audio media transmission channel parameter information, and a video media transmission channel parameter information.
  • the media control channel parameter information is the media control channel parameter information corresponding to the MDF1;
  • the audio media transmission channel parameter information is the media transmission channel parameter information corresponding to the MDF1;
  • the information of the video media transmission channel is the media transmission channel corresponding to the MDF2 Parameter information;
  • the step 1006 does not exist, the information of the video media transmission channel is an invalid information arbitrarily constructed by the SCF.
  • the initial response of this session is forwarded to the terminal through the SCF and IMS CORE, which can be implemented via SIP 200 OK or SIP 183.
  • the terminal When the terminal establishes a session connection with the MDF1 according to the parameter information in the received response, the terminal has an intermediate message, such as an ACK, a PRACK, and the like, and is not described here.
  • an intermediate message such as an ACK, a PRACK, and the like
  • Step 1008 The MCF and the MDF2 establish a video media control channel, and return the video media control channel parameter information to the terminal.
  • step 1006 media delivery session control is performed between the MCF and the MDF2 in this step, the video media control channel is established by the MCF and the MDF2, and the MCF obtains the video media control channel corresponding to the MDF2.
  • Parameter information, and the session modification request containing the parameter information is forwarded to the terminal through the SCF and the IMS CORE, and the terminal returns the session modification response to the MCF through the IMS CORE and the SCF.
  • step 1008 may not exist.
  • the media delivery session control is performed between the MCF and the MDF2, and the MCF obtains the video media control channel parameter information and the video media transmission channel parameter information corresponding to the MDF2, and the session modification request including the two parameter information is obtained.
  • the SCF and the IMS CORE are forwarded to the terminal, and the terminal returns the session modification response to the MCF through the IMS CORE and the SCF.
  • the terminal has an intermediate message interaction, such as ACK, PRACK, and the like, when the terminal establishes a session connection with the MDF2 according to the received parameter information, and details are not described herein again.
  • the scheme in the fifth embodiment can also be used to establish two media control channels between the terminal and the MCF.
  • the eighth embodiment and the ninth embodiment are described by taking the parameter information of a media control channel in the initial session request as an example, and returning the media control channel parameter information of the media server each time until the media component is located.
  • the media control channel parameter information of a media server is returned.
  • the content positioning function entity acquires and returns the same number of media control channel parameter information of the media server at least once. Until the media control channel parameter information of each media server where the media component is located is returned.
  • Embodiment 9 of the present invention may also be combined with Embodiment 2 or Embodiment 5.
  • the tenth embodiment of the present invention further provides a system for establishing a session in an IPTV system, as shown in FIG. 11, including a terminal 51 and a content locating function entity 52, wherein the terminal 51 is configured to send a session initial request that includes a media component identifier, and receive media control channel parameter information.
  • the content location function entity 52 is configured to separately obtain media control channel parameter information of at least two media servers where the media component corresponding to the identifier is located. And returning the parameter information to the terminal separately.
  • the content positioning function entity 52 is configured to acquire and return the same number of media control channel parameter information of the media server at least once.
  • the system further includes a media server 53, and the content locating function entity 52 is configured to initiate a session modification request to the media server 53 when the media control channel parameter information of the same number is requested to be acquired and returned at least twice;
  • the media server 53 is configured to return the parameter information of the media control channel to the content positioning function entity 52.
  • the session modification request is carried by SIP relnvite or SIP Update.
  • the system also includes an IP Multimedia Subsystem device 54 for forwarding the Session Initiation Request to the Content Location Function Entity 52.
  • the ninth embodiment of the present invention further provides a content locating function entity.
  • the content locating function entity includes: a first receiving module 61, The module 62 and the sending module 63, wherein the first receiving module 61 is configured to receive a session initial request, where the request includes a media component identifier; and the obtaining module 62 is configured to respectively obtain at least two media servers where the media component corresponding to the identifier is located The media control channel parameter information; the sending module 63 is configured to separately send the parameter information.
  • the obtaining module 62 is configured to obtain the same number of media control channel parameter information of the media server; The media control channel parameter information of the same number of media servers that will be acquired each time is returned.
  • the obtaining module 62 includes a session modifying unit 64 and a second receiving unit 65, wherein the session modifying unit 64 is configured to initiate a session modification request to the media server; and the second receiving unit 65 is configured to receive the media returned by the media server. Control channel parameter information.
  • the method, the system, and the entity described in the eighth embodiment to the eleventh embodiment of the present invention enable the terminal to obtain the parameter information of the media control channel of the plurality of media servers required, and the parameters of the media control channel obtained each time.
  • the number of messages meets the requirements of the SDP.

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Abstract

L'invention porte sur un procédé, un système et une entité d'établissement de session d'un système de télévision par Internet IP qui concerne la technologie de transmission de données du domaine des communications. Les solutions sont proposées pour résoudre le problème selon lequel un équipement utilisateur ne peut pas établir de connexion de session avec un serveur multimédia lorsqu'un composant multimédia est stocké dans différents serveurs. Le procédé d'établissement de session dans le système de télévision par Internet IP comprend : le renvoi d'informations d'emplacement du serveur multimédia ou d'informations de paramètres correspondant à des paramètres de canal de commande multimédia du serveur multimédia vers l'équipement utilisateur, ou le renvoi d'informations de paramètres de canal de commande multimédia du serveur multimédia en plusieurs fois. Le procédé permet à l'équipement utilisateur d'établir une connexion de session avec le serveur multimédia et coïncide avec le principe de négociation SDP. Les solutions fournies par les modes de réalisation sont adaptées à un système IPTV.
PCT/CN2008/072430 2007-10-16 2008-09-19 Procédé, système et entité d'établissement de session de système de télévision par internet ip Ceased WO2009049518A1 (fr)

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