WO2009049518A1

WO2009049518A1 - A session establishing method, system and entity of ip internet television system

Info

Publication number: WO2009049518A1
Application number: PCT/CN2008/072430
Authority: WO
Inventors: Jincheng Li; Youying Li; Feng Wang; Jun Yan
Original assignee: Huawei Technologies Co., Ltd.
Priority date: 2007-10-16
Filing date: 2008-09-19
Publication date: 2009-04-23
Also published as: CN101415250B; CN101415250A

Abstract

A session establishing method, system and entity of IP internet television system which refer to data transmission technology of communication field are disclosed. The solutions are provided to solve the problem that user equipment could not establish session connection with media server when media component is stored in different servers. The session establishing method in IP internet television system includes: returning location information of the media server, or parameters information corresponding to media control channel parameters of the media server to user equipment, or returning media control channel parameters information of media server in several times. The method makes user equipment establish session connection with the media server, and coincidences with the SDP dealing principle. The solutions provided by the embodiments are fit for IPTV system.

Description

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

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.

Background technique

With the rapid development of communication and IT technologies, with the advent of IP technologies across the link layer transmission medium and the rapid spread of Internet applications, people are no longer satisfied with a single voice communication method, but need a new multimedia communication method. The integration of mobile communication networks and fixed communication networks with IP, Internet and telecommunications networks has undoubtedly become a recognized development direction in the industry. In order to meet the increasing demand of IP multimedia applications, the 3rd Generation Mobile Communications Organization (3GPP) introduced the IP Multimedia Subsystem (IMS) of the all-IP service network architecture based on the packet bearer network.

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. 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.

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. Home Subscriber Server (HSS) and Media Gateway Control Function/Media Gateway (MGCF/IM-MGW) for interworking with the circuit-switched network, the user passes the current local proxy node (Proxy-CSCF, P-CSCF) access to the IMS, session and service trigger control and business control interaction with the AS is attributed to its registration The Domain Service Node (S-CSCF) is completed.

With the gradual improvement of the IMS protocol, the IMS based IPTV service has been rapidly developed. 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.

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).

Real-time Transport Protocol/Real Time Transport Control Protocol (RTP/RTCP), Service Data Point (SDP), Real-Time Streaming Protocol, RTSP), Domain Name Server (DNS) and other protocols cooperate to complete the session establishment and media negotiation of the IPTV system.

In an existing IPTV network deployment, different media components of the same media component may be provided by different providers and distributed across different media servers. For example, for a movie content, it may be combined with multiple languages such as English, Chinese, French, German, Japanese, etc. These different audio files (audio) and video files (video) are stored on different media servers. Thus, when the user views the movie, it is necessary to establish media control channels, such as RTSP connections, and content delivery channels, such as RTP connections, with different media servers.

In the existing IPTV system, 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). Currently, in a system for implementing a content on demand (CoD) service defined in the TISPAN IPTV standard, 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. 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. However, 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.

If the actual situation is that the audio and video components of the media component are respectively located on different media servers, but the terminal side considers that the components of the media component are located in the same media server, then only one media in the SIP INVITE request to initiate the media component identification is initiated. Control channel (such as an RTSP); After receiving the SIP INVITE, 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.

Summary of the invention

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.

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;

And 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;

And 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.

In the embodiment of the present invention, 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. When the media component of the media component requested by the terminal is located on a different media server, the terminal implements a session connection with each media server on the basis of the SDP-compliant processing principle.

DRAWINGS

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;

4 is a schematic structural diagram of a content positioning function entity in Embodiment 3 of the present invention;

5 is a schematic flowchart of signaling in Embodiment 4 of the present invention;

6 is a schematic flowchart of signaling in Embodiment 5 of the present invention;

7 is a schematic structural diagram of a system in Embodiment 6 of the present invention;

8 is a schematic structural diagram of a content positioning function entity in Embodiment 7 of the present invention;

9 is a schematic flowchart of signaling in Embodiment 8 of the present invention;

10 is a schematic flowchart of signaling in Embodiment 9 of the present invention;

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.

detailed description In order to solve the technical problem 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.

The invention will be described in detail below with reference to the accompanying drawings.

As shown in 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

Location information of the location information of the server location information; the number of the media servers 13 is at least two, for establishing a session connection with the terminal 11.

When the location information is the location information of the content locating function entity, 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.

In this embodiment and subsequent embodiments, 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). In the embodiment of the present invention, for the convenience of description, 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. As shown in 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.

In this embodiment, 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.

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.

In various embodiments of the present invention, 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. In this embodiment, 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:

m=video 3400 RTP/AVP 98 //Video RTP media transmission channel

a=rtpmap:98 H263

a=label:l

m=audio 3456 RTP/AVP 97 〃 audio RTP media transmission channel a=rtpmap:97 AMR

a=label:2

m=application 9 TCP/RTSP rtsp //RTSP media control channel

a=connection: new

a=setup: active

a=rtspid m-stream: 1 ,2

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).

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.

In this embodiment, 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. For example, the logical location information of media component A is: SIP: audio.movie@SCF.com, and the logical location information of media component B is: SIP: video.movie@SCF.com. The physical location information may be a SIP URI. For example, the physical location information of the media component A is: SIP: audio.movie@MFl.com, and 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 For example, the physical location information of the media component A is: RTSP://MRcom/movie/audio, and the logical location information of the media component B is: RTSP://MRcom/movie/video.

When the content location function entity is MCF, the logical location information of the media component A is: SIP: audio.movie@MCF.com, and 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; or, 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 location information of the media server or the content locating function entity may be carried in a header field of the response message, such as a Contact header field; or in a message body, such as by a message body attribute line, ^ a=control attribute line, an example is as follows :

m=video 3400 RTP/AVP 98 //Video RTP media transmission channel

a=control: location information

a=rtpmap:98 H263

a=label: l

m=audio 3456 RTP/AVP 97 〃Audio RTP media transmission channel

a=control: location information

a=rtpmap:97 AMR

a=label:2

m=application 0 TCP/RTSP rtsp //RTSP media control channel, port is set to 0, indicating rejection

a=rtspid m-stream: 1 ,2 At the same time, 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.

In this embodiment, 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. In fact, 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.

When the location information received by the terminal is logical 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. After the channel is established, 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.

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.

In the second embodiment, the SCF is used as the content positioning function entity. Similarly, the above process is also applicable to the case where the MCF is used as the content positioning function entity. After the MCF receives the initial session request sent by the terminal, and determines that the video component and the video component are distributed on different MDFs, 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.

Corresponding to the system and method described in Embodiment 1 and Embodiment 2, 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.

Similarly, 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.

Through the first, second and third embodiments of the present invention, 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.

In the embodiment of the present invention, 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.

As shown in FIG. 5, it is a schematic diagram of a signaling flow in Embodiment 4 of the present invention. In this embodiment, 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.

In this embodiment, 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). At this time, 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.

In 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.

The implementation of 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.

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.

The SDP answer in the initial response of the session is returned by the content locating function entity to the terminal. The parameter information corresponding to the media component in the session initial request in step 501 is carried in: 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.

In this step, 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.

At this time, 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.

In the fourth embodiment, when the media components are all located in the same media server, 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.

When 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. When 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, and 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. When 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), and saves the parameter information and assigned RTSP of the media control channel with the audio and video MDF. Corresponding to the parameter information of the media control channel, and returning the parameter information of the allocated RTSP media control channel to the terminal, so that the terminal can implement the IPTV service.

The terminal can directly control the two MDFs according to the allocated RTSP media control channel. In addition, the fifth embodiment of the present invention further provides a method for the terminal to directly control the MDF1 and indirectly control the MDF2. In this embodiment, 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.

In this embodiment, the audio component is set to MDF1, the video component is located at MDF2, and the text component is located at MDF3.

Step 605: The MCF establishes a session connection with the MDF1.

Media delivery session control between MCF and MDF1, establishment between MCF and 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.

In this step, 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.

Media delivery session control between MCF and MDF2, MCF obtains video media transmission channel parameter information, such as RTP channel parameter information.

Similarly, the communication protocol of MCF and MDF can be one or any combination of H.248, RTSP or SIP protocols.

This step does not have to exist. 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. .

This step 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. Also, 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. Media control channel parameter information generated by media control channel parameter information MCF; audio media transmission channel parameter information is media transmission channel parameter information corresponding to MDF1; video media transmission channel information is MDF2 corresponding media transmission channel parameter information; text media transmission channel 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.

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.

The fourth embodiment and the fifth embodiment of the present invention also correspond to the system described in Embodiment 6 of the present invention. As shown in FIG. 7, 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 session initial request, and receiving the media control channel parameter information; 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.

When the content locating function entity is an MCF, 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. As shown in FIG. 8, 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 .

When the content locating function entity is an MDF, 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.

Another implementation scheme is proposed in the eighth embodiment of the present invention. 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. As shown in FIG. 9, when the audio component of the media component is located, Media Server A, video media component is located in the media service For device B, 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 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). At this time, the media control channel parameter information is the media control channel parameter information carried in the terminal request, and 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.

Through 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. At this time, 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. In this embodiment, the existence of step 905 is optional, as indicated by the dotted line in the figure. In the implementation, 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. In this embodiment, 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; when the step 905 exists, the video media The transmission channel parameter information is the corresponding media transmission channel information on the media server B. When the step 905 does not exist, 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.

In this embodiment, 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.

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.

In this step, the terminal may initiate a request to establish a video media control channel with the media server B, and the SCF may initiate a request to establish a video media control channel with the media server B.

For example, when the SCF initiates the request, when the step 905 exists, 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. 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.

When the step 905 does not exist, 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.

At this point, 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.

Similar to the step 606, 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.

In the foregoing steps 901 to 907, 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. .

In addition, when the media components in the requested media component are distributed among the three media servers, the media control channel parameter information corresponding to the third media server is obtained according to the method of step 907 of the embodiment.

In this embodiment, 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. To the terminal, 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. In the ninth embodiment of the present invention, the MCF is used as a content locating function entity as an example. As shown in FIG. 10, the method includes the following steps: Step 1001: Terminal to IMS The CORE initiates a session initial request containing the requested media component identifier.

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.

In this embodiment, 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.

Step 1006: The MCF establishes a video media transmission channel with the MDF2.

This step does not have to exist. MCF can also temporarily not contact MDF2. 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; when the step 1006 exists, the information of the video media transmission channel is the media transmission channel corresponding to the MDF2 Parameter information; When the step 1006 does not exist, the information of the video media transmission channel is an invalid information arbitrarily constructed by the SCF.

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.

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.

When only the video media transmission channel is established between the MCF and the MDF2 in 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.

When both the video media transmission channel and the video media control channel are established between MCF and MDF2 in step 1006, step 1008 may not exist.

When the step 1006 does 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. Similarly, 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.

When the MCF does not support aggregation control (Aggregate control), 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. Similarly, when the session initial request includes the parameter information of the set number of media control channels, 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.

According to the solution described in the foregoing embodiment 8 and the ninth embodiment, 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.

When the session initial request includes the parameter information of the set number of media control channels, 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.

According to the method and system of the embodiment VIII to the embodiment, the ninth embodiment of the present invention further provides a content locating function entity. As shown in FIG. 12, 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.

When the session initial request includes the parameter information of the set number of media control channels, 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.

A person skilled in the art can understand that all or part of the steps of implementing the above embodiments can be completed by a program to instruct related hardware, and the program can be stored in a computer readable storage medium, such as ROM/RAM, magnetic. Disc or CD. The spirit and scope of the invention. Thus, it is intended that the present invention cover the modifications and variations of the inventions

Claims

Claim

A method for establishing a session in an IP internetworking television system, the method comprising: the terminal sending a session initial request to the content locating function entity, where the request includes a media component identifier; and the terminal receiving the content locating function entity The returned location information, where the location information of the at least two media servers where the media component corresponding to the identifier is located, or the content of the location information of at least two media servers where the media component corresponding to the identifier is located Positioning the location information of the functional entity;

The terminal establishes a session connection with the media server where the media component corresponding to the identifier is located by using the location information.

2. The method for establishing a session in an IP internetworking television system according to claim 1, wherein:

When the location information is the location information of the content locating function entity, the terminal obtains the location information of the media server where the media component corresponding to the identifier is located by using the content locating function entity, and uses the location information to separately correspond to the media server. Establish a session connection;

When the location information is the location information of the media server, the terminal directly establishes a session connection with the media server corresponding to the location information.

The method for establishing a session in an IP internetworking television system according to claim 1, wherein the content positioning function entity is a service control function entity, a media control function entity or a media delivery function entity, or has a medium. A separate entity for the server selection feature.

The method for establishing a session in an IP internetworking television system according to claim 1, wherein the location information is returned to the terminal by using a redirect message or a notification message Notify.

A system for establishing a session in an IP internetworking television system, comprising: a terminal, configured to send a session initial request including a media component identifier, receive location information, and use the location information to correspond to the identifier The media server where the media component is located establishes a connection;

a content locating function entity, configured to receive the initial session request, and return the Position information of the location information function entity of the location information;

The system for establishing a session in an IP internetworking television system according to claim 5, wherein the content locating function entity is a service control function entity, a media control function entity or a media delivery function entity, or has a medium. A separate entity for the server selection feature.

The system for establishing a session in an IP internetworking television system according to claim 5, wherein when the location information is location information of the content location function entity,

The content locating function entity is configured to send the media server location information of the media component corresponding to the identified identifier to the terminal;

The terminal is configured to establish a session connection with the media server by using the received media server location information.

8. The system for session establishment in an IP internetworking television system according to claim 5, wherein the location information is carried by a redirect message or a notification message Notify.

9. A content locating functional entity, comprising:

The content locating function entity according to claim 9, wherein the content locating function entity is a service control function entity, a media control function entity or a media delivery function entity, or an independent entity having a media server selection function. .

The content locating function entity according to claim 9, wherein the location information is carried by a redirect message or a notification message Notify.

12. A method for establishing a session in an IP internetworking television system, the method comprising: The content locating function entity receives the session initial request sent by the terminal, where the request includes the media component identifier, the server, and the media control channel parameter information of the media server, and the media control channel parameter information corresponding to the parameter information Return to the terminal.

The method for establishing a session in an IP internetworking television system according to claim 12, wherein the obtaining media control channel parameter information, and returning media control channel parameter information corresponding to the parameter information to The process of the terminal includes:

The content positioning function entity acquires the determined first media control channel parameter information of the first media server, and returns the parameter information to the terminal;

The first media server establishes control channel parameter information with the determined remaining media servers, and establishes a correspondence between the control channel parameter information and the first media control channel parameter information.

The method for establishing a session in an IP internetworking television system according to claim 12, wherein when the content locating function entity is a service control function entity, the session initial request is through an IP multimedia subsystem device. Forwarded

When the content locating function entity is a media control function entity, the session initial request is forwarded by the IP multimedia subsystem device and the service control function entity.

A session establishment system in an IP internetworking television system, comprising: a terminal, configured to send a session initial request including a media component identifier, and receive media control channel parameter information;

16. The system for session establishment in an IP internetworking television system according to claim 15, wherein: The content locating function entity is configured to obtain the first media control channel parameter information of the first media server that is determined, and return the parameter information to the terminal;

The first media server is configured to establish control channel parameter information with the determined remaining media servers, and establish a correspondence between the control channel parameter information and the first media control channel parameter information.

17. A content locating functional entity, comprising:

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;

The content locating function entity according to claim 17, wherein the content locating function entity is a service control function entity, a media control function entity or a media delivery function entity.

The content locating function entity of claim 18, wherein when the content locating function entity is a media delivery function entity, the obtaining module comprises:

An execution unit, configured to send its own media control channel parameter information to the sending module, and an establishing unit, configured to separately establish control channel parameter information with the remaining media servers, and establish the control channel parameter information and the media of the self Controls the correspondence between channel parameter information.

A method for establishing a session in an IP internetworking television system, the method comprising: the terminal sending 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 server, and The parameter information is returned to the terminal respectively.

The method for establishing a session in an IP internetworking television system according to claim 20, wherein the process of separately obtaining and returning media control channel parameter information of the media server comprises: when the session initial request includes When the parameter information of the number of media control channels is set, the content positioning function entity acquires and returns the same number of media control channel parameters of the media server. Information.

The method for establishing a session in an IP internetworking television system according to claim 21, wherein the process of acquiring and returning the same number of media control channel parameter information at least twice comprises: The media server initiates a session modification request, and the media server returns parameter information of the media control channel to the content location function entity.

The method for establishing a session in an IP internetworking television system according to claim 22, wherein the session modification request is a re-invitation message SIP relnvite of the session initiation protocol or an update message SIP Update of the session initiation protocol. of.

A system for establishing a session in an IP internetworking television 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 controls channel parameter information, and returns the parameter information to the terminal.

A system for session establishment in an IP internetworking television system according to claim 24, wherein:

When the session initial request includes the parameter information of the set number of media control channels, the content positioning function entity is configured to acquire and return the same number of media control channel parameter information of the media server.

The system for establishing a session in an IP internetworking television system according to claim 25, further comprising: a media server, when at least twice requesting to acquire and return the same number of media control channel parameter information,

The content locating function entity is configured to initiate a session modification request to the media server, and the media server is configured to return parameter information of the media control channel to the content locating function entity.

The system for establishing a session in an IP internetworking television system according to claim 24, wherein the session modification request is a re-invitation message through a session initiation protocol, SIP relnvite or conference The update message of the initialization protocol is hosted by SIP Update.

The system for establishing a session in an IP internetworking television system according to claim 24, wherein the content positioning function entity is a service control function entity or a media control function entity.

29. A content locating functional entity, comprising:

a first receiving module, configured to receive a session initial request, where the request includes a media component identifier; media control channel parameter information of the server;

And a sending module, configured to separately send the parameter information.

30. The content locating function entity according to claim 29, wherein when the session initial request includes parameter information of a set number of media control channels,

The obtaining module is configured to acquire media control channel parameter information of the same number of media servers;

The sending module is configured to send the same number of media control channel parameter information of the media server that is acquired each time.

The content locating function entity of claim 30, wherein the obtaining module comprises:

a session modification unit, configured to initiate a session modification request to the media server;

The second receiving unit is configured to receive parameter information of the media control channel returned by the media server.

The content locating function entity according to claim 29, wherein the session modification request is carried by a re-invitation message SIP relnvite of the session initiation protocol or an update message SIP Update of the session initiation protocol.

The content locating function entity according to claim 29, wherein the content locating function entity is a service control function entity or a media control function entity.