WO2009043241A1 - A method, system and device for controling media stream by the service providing entity - Google Patents

A method, system and device for controling media stream by the service providing entity Download PDF

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Publication number
WO2009043241A1
WO2009043241A1 PCT/CN2008/071819 CN2008071819W WO2009043241A1 WO 2009043241 A1 WO2009043241 A1 WO 2009043241A1 CN 2008071819 W CN2008071819 W CN 2008071819W WO 2009043241 A1 WO2009043241 A1 WO 2009043241A1
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WO
WIPO (PCT)
Prior art keywords
media
resource server
service providing
providing entity
media resource
Prior art date
Application number
PCT/CN2008/071819
Other languages
French (fr)
Chinese (zh)
Inventor
Xiao Wang
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 WO2009043241A1 publication Critical patent/WO2009043241A1/en

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Classifications

    • 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
    • H04N7/17336—Handling of requests in head-ends
    • 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]
    • H04N21/20—Servers specifically adapted for the distribution of content, e.g. VOD servers; Operations thereof
    • H04N21/23—Processing of content or additional data; Elementary server operations; Server middleware
    • H04N21/238—Interfacing the downstream path of the transmission network, e.g. adapting the transmission rate of a video stream to network bandwidth; Processing of multiplex streams
    • H04N21/2387—Stream processing in response to a playback request from an end-user, e.g. for trick-play

Definitions

  • the present invention relates to the field of IP television (IPTV) technology, and in particular, to a method, system and apparatus for controlling a media flow by a service providing entity.
  • IPTV IP television
  • IPTV is a new technology that utilizes broadband cable TV networks to integrate Internet, multimedia, and communication technologies to provide home users with a variety of interactive services, including digital TV.
  • IPTV uses Transmission Control Protocol/Internet Protocol (TCP/IP) as a bearer protocol for unicast, broadcast or multicast video services, effectively combining the three areas of TV network, telephone network and Internet. Representative business.
  • TCP/IP Transmission Control Protocol/Internet Protocol
  • IP Multimedia Subsystem is an IP-based standard system independent of access technology, IMS and existing voice and data networks (whether fixed networks such as PSTN, ISDN, Internet, etc.) Mobile networks such as GSM and CDMA can be interoperable.
  • the IMS architecture enables peer-to-peer IP communications through various types of User Equipments (UEs) and the quality of service required.
  • UEs User Equipments
  • the IMS architecture also involves the functions necessary to complete service provisioning (eg registration, security, billing, bearer control, roaming). That is, the IMS system forms the core of the IP core network.
  • NASS Network At tachment Sub-System
  • RACS Resource and Admi ss ion Control
  • the NASS is used to complete the management of the UE attaching to the access network, including user authentication and network address allocation, and location management.
  • RACS is mainly used to complete policy control, resource reservation and admission control.
  • the service/application level can use the RACS to request the access network to reserve related resources.
  • the IMS-based IPTV architecture will directly reuse the relevant functional entities of IMS, and realize the support for IPTV services by appropriately adding new functional entities and expanding the related functions of existing functional entities. Hold.
  • FIG. 1 shows a networking diagram of an IMS-based IPTV architecture in the prior art.
  • each IPTV service consists of a pair of IPTV Service Control Functions (SCF) and IPTV Media Functions (MF).
  • SCF IPTV Service Control Functions
  • MF IPTV Media Functions
  • the SCF is a Session Initiation Protocol (SIP) application server, and serves as a service providing entity.
  • the tasks include: (1) Authorization during session initialization; (2) Implementing a modification process to check user data. To decide whether to allow users to access the service; (3) account control; (4) select the corresponding MF.
  • MF is responsible for the control and delivery of media streams. It can be divided into media control function (MCF) and media delivery function (MDF).
  • the tasks of the MCF mainly include: (1) processing the control of the media stream; (2) monitoring the state of the MDF (optional); (3) managing the interaction with the UE; (4) selecting when the MCF controls multiple MDFs An MDF; (5) perceiving the distribution of the status and content of different MDFs; (5) generating billing information.
  • the tasks of MDF mainly include: (1) processing the delivery of media streams; (2) reporting status to MCF
  • the UE establishes a Real Time Stream Protocol (RTSP) control channel with the MCF to control the media stream to implement Video Cassette Recording (VCR) operations, including fast forward and backward. Pause, position, play normally, etc.
  • RTSP Real Time Stream Protocol
  • VCR Video Cassette Recording
  • the operator or service provider wants to implement VCR control on the specified media stream through SCF.
  • SCF Real Time Stream Protocol
  • the embodiment of the present invention provides a method for controlling a media flow by a service providing entity, which can implement control of a media stream by a service providing entity.
  • a media stream connection between the user equipment and the media resource server including the following steps:
  • the service providing entity initiates a control operation on the media stream;
  • the control operation on the media stream is performed by a media resource server.
  • the embodiment of the present invention further provides another method for controlling the media flow by the service providing entity.
  • the media stream connection and the RTSP control channel exist between the user equipment and the media resource server, and the method includes the following steps:
  • the service providing entity controls the media resource server to execute the prohibiting user.
  • the service providing entity initiates a control operation on the media stream
  • the service providing entity controls the media resource server to perform media stream control operations for restoring the user equipment.
  • the embodiment of the present invention further provides a system for controlling a media stream by a service providing entity, including: a media resource server, configured to establish a media stream with the user equipment;
  • a service providing entity configured to send, to the media resource server, a control command for the media stream
  • the media resource server is further configured to perform a control operation on the media stream according to a control command of the service providing entity.
  • An embodiment of the present invention further provides a service providing entity, including:
  • the media stream control module is configured to initiate a control operation on the media stream to the media resource server. It can be seen from the foregoing technical solution that the service providing entity temporarily controls the media stream control operation of the user equipment, and then the service providing entity sends a media flow control command to the media resource server, so that the service providing entity controls the specified media in some service scenarios.
  • the flow performs operations of backing, fast forward, pause, and positioning.
  • FIG. 1 is a schematic diagram of networking of an IMS-based IPTV architecture in the prior art
  • FIG. 3 is a signaling flowchart of a first embodiment of the present invention.
  • Figure 5 is a general architecture of media control
  • 6 is a signaling flowchart of a third embodiment of the present invention
  • FIG. 10 is a structural block diagram of a service providing entity in an embodiment of the present invention.
  • FIG. 11 is a block diagram of a system structure for implementing control of a media stream by a service providing entity according to an embodiment of the present invention.
  • the service providing entity in the embodiment of the present invention is a service control function entity SCF
  • the media resource server is a media function entity MF.
  • the media function entity MF may include a media control function entity MCF and a media delivery function entity MDF.
  • the business control function entity SCF interacts with the media control function entity MCF to implement the service, and the media control function entity MCF controls the media delivery function entity MDF to complete media processing and delivery.
  • the interaction process between the MDF and the MCF is not described, and the two are described as MF as a whole.
  • the service providing entity in the embodiment of the present invention is an application server AS
  • the media resource server is a media resource function entity MRF.
  • the media resource function entity MRF includes a media resource function control entity MRFC and a media resource function processing entity MRFP.
  • the application server AS interacts with the media resource function control entity MRFC to implement the service, and the media resource function control entity MRFC controls the media resource function processing entity MRFP to complete media processing and delivery.
  • the following describes the embodiment of the SPAN IPTV as a service scenario.
  • the related process is also applicable to the interaction between the AS and the MRFC in the IMS architecture. The description is not repeated in the embodiment.
  • the first object of the solution of the present invention is to implement VCF control operations such as back-off, fast-forward, pause, and positioning of the media stream by the SCF.
  • Figure 2 shows the overall process framework of the solution of the present invention.
  • Step 201a The SCF service is triggered to initiate control of the media stream between the UE and the MF.
  • Step 202a The SCF initiates a control operation of the media stream.
  • Step 203a The MF performs the control operation on the media stream.
  • Another object of the solution of the present invention is to solve the VCR control conflict caused by the SCF and the UE simultaneously performing media stream VCR control.
  • the media stream and the RTSP control channel already exist between the UE and the MF perform the following steps:
  • Step 201b Before the SCF initiates a control operation of the media stream, the SCF initiates a control channel between the UE and the MF.
  • Step 202b After the SCF initiates a control operation of the media stream, the SCF initiates activation of a control channel between the UE and the MF.
  • step 201b is added between step 201a and step 202a, and step 202b is added after step 203a.
  • VCR operation of the SCF is described in detail through three embodiments.
  • Embodiment 1 RTSP control mode
  • RTSP is an application-level protocol that controls the delivery of real-time data.
  • RTSP provides an extensible framework that enables controlled, on-demand delivery of real-time data such as audio and video.
  • Data sources include live data (such as live broadcasts) and data stored in clips (such as V0D, etc.).
  • the purpose of the protocol is to control multiple data transfer sessions, providing a method for selecting a transport channel, such as UDP, multicast UDP, and TCP, to provide a method based on the RTP selective transport mechanism.
  • RTSP control methods include:
  • the SCF negotiates with the MF through a Session Description Protocol (SDP) to establish an association between the RTSP channel between the SCF and the MF and the controlled media stream.
  • SDP Session Description Protocol
  • the SCF controls the media stream through the RTSP channel
  • the RTSP channel between the SCF and the MF is released. Based on the channel reuse and other reasons, the RTSP channel may not be released.
  • Steps 301 ⁇ 306 The UE performs SIP SDP interaction with the MF through the SCF, and establishes a media stream.
  • Step 307 The service is triggered on the SCF, and the control of the media stream of the UE needs to be initiated.
  • Step 308 The SCF sends an intra-session invite (INVITE) message to the MF, carries the SDP offer, and creates a new RTSP control channel between the SCF and the MF.
  • ISVITE intra-session invite
  • INVITE sip MF.example.com SIP/2.0
  • Step 309 MF returns 200 OK, carries SDP answer (SDP answer) 0
  • Step 310 The SCF sends an ACK acknowledgement, and an RTSP channel is established between the SCF and the MF.
  • Step 311 The SCF sends an RTSP command to the MF to control the media stream through the RTSP channel, and the MF executes the command to perform a corresponding VCR operation.
  • Step 312 The SCF sends an intra-session INVITE message to the MF, and carries the SDP offer to release the RTSP channel between the newly created SCF and the MF. In some scenarios, the channel reuse may not release the RTSP channel.
  • INVITE sip MF.example.com SIP/2.0
  • Step 313 MF returns 200 OK, carrying SDP answer.
  • Step 314 The SCF sends an ACK confirmation.
  • the SCF controls the media stream between the UE and the MF through the RTSP control channel.
  • Embodiment 2 SIP message control mode
  • SIP is one of the multimedia communication system framework protocols developed by the Interne Engineering Task Force (IETF). It is an application layer protocol for establishing, changing or ending multimedia sessions, and real-time transport protocols (RTP, Rea l Timing Transmi ss ion Protoco l / Real-time Transmission Control Protocol (RTCP, Rea lt ime Transpor Control Protocol), SDP, RTSP, Domain Name System (DNS, Doma in Name System) and other protocols cooperate to complete session establishment and media negotiation in IMS; Sessions, media streams will be transmitted directly in the bearer layer using the RTP protocol, and multiple media can be flexibly interacted in one session.
  • RTP Real-time transport protocols
  • RTCP Rea l Timing Transmi ss ion Protoco l / Real-time Transmission Control Protocol
  • SDP Rea lt ime Transpor Control Protocol
  • DNS Domain Name System
  • SIP message control methods include:
  • the SCF sends an S IP message to the MF to which the associated media stream belongs, and the SIP message carries a control indication for controlling the media stream.
  • the control indication includes: fast forward, backward, pause, locate, normal play, and the like;
  • FIG. 4 The specific implementation process of this embodiment is shown in FIG. 4, and includes the following steps:
  • Steps 401 - 406 The UE performs SIP SDP interaction with the MF through the SCF to establish a media stream.
  • Step 407 Trigger a service on the SCF, and initiate control of the UE media stream.
  • Step 408 The SCF sends an INF0 message carrying the back indication to the MF, and controls the media stream to go backward.
  • Step 409 The MF returns a 200 0K response message.
  • Step 410 The SCF sends an INF0 message carrying the positioning indication to the MF, and controls media stream positioning.
  • Step 412 The SCF sends an INF0 message carrying a normal play indication to the MF, and controls the media stream to be positive. - ⁇ - w ⁇ mz mm
  • control indication of the media stream there are other ways to describe the control indication of the media stream. If the indication is carried through the existing SIP header field or by defining a new SIP header field, but the expression is similar, the repeated examples are not repeated here.
  • SIP INFO messages is only an embodiment. Other SIP messages, such as MESSAGE, can also be used in this process to replace INFO to achieve the same function, and the repeated examples are not used here.
  • Embodiment 3 Media Control Message Mode
  • a draft of the IETF (draf t_boul ton_s ip_control_f ramework_04. txt ) defines a common architecture for media control. As shown in Figure 5, the architecture defines three logical roles: Media Control Server (Control Server), Media Control Client ( Control Cl ient ) and the Media Control Channel (Control Channe l ), where
  • the media control server is a logical entity for accepting media processing request messages of the media control client, and performing specific media processing operations, such as: playing, recording, media mixing, etc.;
  • the media control client is a logical entity, and sends a message to the media control server to request processing of the media resource;
  • the media control channel is a channel for the media control client to perform SDP interaction between the SIP and the media control server, and negotiate a reliable connection-based delivery control message.
  • the media control client and the media control server establish a media control channel through the S IP SDP interaction, and the media control client sends a media control message to the media control server through the media control channel to implement media control processing.
  • the MF is the media control server and the SCF is the media control client.
  • the MRF is the media control server and the AS is the media control client.
  • the SCF and the MF negotiate to establish a media control channel 2 corresponding to the media session through SDP negotiation;
  • the SCF sends a media control message carrying control indication to the MF through channel 2 to control the media stream;
  • control instructions include: fast forward, backward, pause, position, normal play, and so on.
  • FIG. 6 The specific implementation process of this embodiment is shown in FIG. 6, and includes the following steps:
  • Steps 601 ⁇ 606 The UE performs SIP SDP interaction with the MF through the SCF, and establishes a media stream and
  • Step 607 Trigger a service on the SCF, and initiate a control on the UE media stream.
  • Step 608 The SCF sends an intra-session INVITE message to the MF, carries the SDP offer, and establishes a media control channel through SDP negotiation.
  • INVITE sip MF.example.com SIP/2.0
  • Step 609 The MF returns 200 OK, carrying the SDP answer;
  • Step 610 The SCF sends an ACK acknowledgement, and the media control channel is established between the SCF and the MF.
  • Step 611 The SCF sends a media control message to the MF through the media control channel, and carries the fast forward, backward, locate, pause, and normal play indications to control the media stream.
  • Step 612 The SCF sends a media control message to the MF.
  • the MRequest carries a fast forward indication, and controls the media stream to fast forward;
  • Step 613 The MF performs a media stream fast forward operation, and returns a MResponse response message.
  • the MRequest carries a pause indication to control the media stream suspension.
  • Step 615 The MF performs a media stream pause operation, and returns a MResponse response message.
  • INVITE sip MF.example.com SIP/2.0
  • Step 617 MF returns 200 OK, carrying SDP answer
  • Step 618 The SCF sends an ACK confirmation.
  • the control of the media control message carrying the media stream indicates that the embodiment can implement a similar scheme as the S IP message control method.
  • Embodiment 4 SDP negotiation mode to avoid VCR operation conflicts
  • FIG. 7 The specific implementation process of this embodiment is shown in FIG. 7, and includes the following steps:
  • Steps 701 ⁇ 706 The UE performs S IP SDP interaction with the MF through the SCF, and establishes a media stream and
  • RTSP Channe l this RTSP control channel is called channel 1.
  • Step 707 The service is triggered on the SCF, and the VCR operation of the UE needs to be prohibited.
  • Step 708 The SCF sends an intra-session invite (INVITE) message to the MF, carrying the SDP offer, and setting the UE's RTSP channel, channel 1, to the deactivated state.
  • ISVITE intra-session invite
  • INVITE sip MF.example.com SIP/2.0
  • Step 709 The MF returns 200 OK, carrying an SDP answer (SDP answer).
  • SDP answer An example of the 200 OK message is given below:
  • Step 710 The SCF sends an ACK acknowledgement.
  • Step 711 The SCF sends an intra-session INVITE message to the UE, carries the SDP offer, and sets the RTSP channel of the UE to an deactivated state, so that the UE knows that the RTSP channel is disabled.
  • INVITE si uehost. example. com SIP/2.0
  • Step 712 The UE returns 200 OK, carrying the SDP answer;
  • Step 713 The SCF sends an ACK confirmation.
  • Step 714 The SCF performs SDP negotiation with the MF to restore the VCR operation of the UE.
  • Step 715 The SCF sends an intra-session INVITE message to the MF, carries the SDP offer, and sets the UE's RTSP channel to an active state.
  • INVITE sip MF.example.com SIP/2.0
  • Step 716 The MF returns 200 OK and carries the SDP answer;
  • Step 717 The SCF sends an ACK acknowledgement
  • Step 718 The SCF sends an intra-session INVITE message to the UE, carries the SDP offer, and sets the RTSP channel of the UE to an active state, so that the UE knows that the RTSP channel is available.
  • INVITE si uehost. example. com SIP/2.0
  • Step 719 The UE returns 200 OK and carries the SDP answer ;
  • Step 720 The SCF sends an ACK confirmation.
  • the SCF sends the INVITE message in the session to the MF and the UE respectively, and the INVITE message can be sent to the MF and the UE at the same time, without waiting for 200 0K to return; the SCF can also send the MF to the MF and the MF.
  • the UE sends an update (UPDATE) message to implement SDP negotiation.
  • a way to deactivate the RTSP channel is given.
  • the SCF performs SDP negotiation with the MF, prohibits the UE from controlling the media stream, and then resumes the UE's control operation on the media stream, so as to avoid
  • Embodiment 5 Avoiding VCR conflicts through SIP messages
  • FIG. 8 The specific implementation process of this embodiment is shown in FIG. 8, and includes the following steps:
  • Steps 801 ⁇ 806 The UE performs S IP SDP interaction with the MF through the SCF to establish a media stream and an RTSP control channel, and the RTSP control channel is referred to as channel 1.
  • Step 807 The service is triggered on the SCF, and the VCR operation of the UE needs to be prohibited.
  • Step 808 The SCF sends an intra-session INVITE message to the MF, and carries the SDP offer.
  • the STP negotiation is used to set the UE's RTSP channel, that is, the channel 1 to the deactivated state, and the RTSP operation of the UE is prohibited.
  • INVITE sip MF.example.com SIP/2.0
  • Step 809 MF returns 200 OK, carrying SDP answer.
  • Step 810 The SCF sends an ACK confirmation.
  • Step 811 The SCF ends the control of the media stream, sends an intra-session INVITE message to the MF, carries the SDP offer, and sets the UE's RTSP channel, channel 1, to the active state through SDP negotiation.
  • INVITE sip MF.example.com SIP/2.0
  • Step 812 MF returns 200 OK, carrying SDP answer.
  • Step 813 The SCF sends an ACK acknowledgement.
  • Embodiment 6 Avoiding VCR conflicts through media control messages
  • FIG. 9 The specific implementation process of this embodiment is shown in FIG. 9, and includes the following steps:
  • Steps 901 ⁇ 906 The UE performs SIP SDP interaction with the MF through the SCF to establish a media stream and an RTSP control channel.
  • Step 907 The service is triggered on the SCF, and the VCR operation of the UE needs to be prohibited.
  • the SCF and the MF perform SDP negotiation, and the VCR operation of the UE is prohibited.
  • Steps 908-910 If there is no media control channel available between the SCF and the MF, the SCF sends an intra-session INVITE message to the MF, carries the SDP offer, and negotiates to establish a media control channel.
  • Step 911 The SCF sends a media control message to the MF.
  • the MRequest carries a VCR operation indication that prohibits the UE;
  • Step 912 MF returns a response message MRe sponse
  • Step 913 The SCF notifies the UE that the VCR operation is prohibited.
  • Step 914 The SCF sends a media control message to the MF.
  • the MRequest carries a VCR operation indication that allows the UE.
  • Step 915 MF returns a response message MRe sponse
  • Step 916 The SCF notifies the UE to allow the VCR operation to be performed.
  • the system for implementing the control of the media stream by the service providing entity in the embodiment of the present invention, as shown in FIG. 11, includes at least:
  • a media resource server 1110 configured to establish a media stream with the user equipment
  • a service providing entity 1120 configured to send, to the media resource server, a control command for the media stream
  • the media resource server controls the media stream according to the control command of the service providing entity.
  • the interaction relationship between the service providing entity and the media resource server is classified into the following three categories:
  • the first type refers to the solution of the first embodiment of the present invention, through the service providing entity and the media resource service
  • the SDP protocol negotiation is performed between the server, and the RTSP control channel is established between the service providing entity and the media resource server.
  • the service providing entity initiates the media to the media resource server by using an RTSP control channel between the service providing entity and the media resource server. Flow control operation.
  • the RTSP control channel is not removed when the control operation is completed for channel reuse.
  • the second type refers to the solution of the second embodiment of the present invention
  • the service providing entity sends an IP message carrying the media control command to the media resource server
  • the media resource server performs the media stream control operation according to the media control command carried in the S IP message. .
  • This interaction does not require a control channel between the two.
  • the third type refers to the solution of the third embodiment of the present invention, where the service providing entity is configured to establish a media control channel with the media resource server, and provide a media control channel between the service providing entity and the media resource server to the media resource server. Initiate control of the media stream.
  • the service providing entity further sends a prohibition indication to the media resource server, and the prohibition indication is used to prohibit the An RTSP control channel between the user equipment and the media resource server;
  • the media resource server prohibits the RTSP control channel of itself and the user equipment according to the prohibition indication from the service providing entity.
  • the service providing entity After the service providing entity completes control of the media stream, the service providing entity is further configured to send an permission indication to the media resource server, where the permission indication is used to allow the RTSP control channel that is prohibited between the user equipment and the media resource server .
  • the service providing entity is an SCF, and the media resource server is an MF;
  • the service providing entity is an AS
  • the media resource server is an MRF
  • the structure of the service providing entity in the embodiment of the present invention is as shown in FIG. 10, and includes:
  • the media stream control module 1010 is configured to initiate a control operation on the media stream to the media resource server.
  • the media flow control module 1010 includes:
  • the conflict avoiding unit 101 1 is configured to send a prohibition indication to the media resource server, where the prohibition refers to Indicated to disable the RTSP control channel between the user equipment and the media resource server.
  • the prohibition indication may be an intra-session INVITE message carrying an SDP offer, and setting the RTSP control channel of the user equipment to an deactivated state.
  • the media stream associated with the RTSP control channel is de-associated.
  • the collision avoidance unit 1011 is further configured to send an indication of permission to the media resource server, the permission indication for allowing the RTSP control channel between the user equipment and the media resource server to be disabled.
  • the allowable indication may be an intra-session INVITE message carrying an SDP offer to set the RTSP channel of the user equipment to an active state.
  • the media flow control module 1010 further includes any one of the following units:
  • the first group the RTSP control channel unit 1012 and the sending unit 1013, the RTSP control channel unit 1012 is configured to interact with the media resource server to establish an RTSP control channel between the service providing entity and the media resource server.
  • the interaction process is: the RTSP control channel unit 1012 sends an intra-session INVITE message to the media resource server, carries the SDP offer, creates an RTSP control channel between the service providing entity and the media resource server, and the media resource server receives the INVITE message. Returning a 200 OK message to the RTSP control channel unit 1012, carrying an SDP response; the RTSP control channel unit 1012 sends an ACK acknowledgement to the media resource server.
  • the sending unit 1013 is configured to send a media flow control command to the media resource server by using an RTSP control channel between the service providing entity and the media resource server.
  • the second group: the S IP message sending unit 1014 is configured to send an S IP message carrying the media control command to the media resource server.
  • the SIP message carrying the media control command may be an INFO message, and after receiving the INF0 message, the media resource server performs a corresponding media stream control operation.
  • the third group the media control channel unit 1015, configured to interact with the media resource server, and establish a media control channel between the service providing entity and the media resource server; the interaction process may include:
  • the media control channel unit 1015 sends an intra-session INVITE message to the media resource server. With the SDP offer; the media resource server returns 200 OK, carrying the SDP answer; the media control channel unit 1015 sends an ACK confirmation to the media resource server.
  • the sending unit 1016 is configured to send a media flow control command to the media resource server by using a media control channel between the service providing entity and the media resource server.
  • the media flow control command is carried in a media control message (MRequest).
  • the invention solves the operation that the service providing entity needs to control the specified media stream to perform back, fast forward, pause, and locate in certain service scenarios.

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Abstract

A method for controlling media stream by a service providing entity, wherein there is a media stream connection between a user device and a media resource server, includes the following steps that: the service providing entity initiates a media stream control operation which is performed by the media resource server. Another method for controlling media stream by the service providing entity, a system for controlling media stream by the service providing entity and a service providing entity are disclosed in accordance with the invention. According to the invention, it is possible to realize that the service providing entity controls the specified media stream so as to perform VCR operation in some servicing situation.

Description

一种业务提供实体对媒体流控制的方法、 系统和装置 技术领域  Method, system and device for controlling media flow control by physical service entity
本发明涉及 IP电视（ IPTV )技术领域， 特别涉及一种业务提供实体对媒 体流控制的方法、 系统和装置。 背景技术  The present invention relates to the field of IP television (IPTV) technology, and in particular, to a method, system and apparatus for controlling a media flow by a service providing entity. Background technique
IPTV是一种利用宽带有线电视网， 集互联网、 多媒体、 通讯等多种技术 于一体， 向家庭用户提供包括数字电视在内的多种交互式服务的崭新技术。 IPTV is a new technology that utilizes broadband cable TV networks to integrate Internet, multimedia, and communication technologies to provide home users with a variety of interactive services, including digital TV.
IPTV使用传输控制协议 /因特网协议（ TCP/IP )作为承载协议进行单播、 广播 或组播视频业务， 有效地将电视网、 电话网和互联网三个领域结合在一起， 是三网融合最具代表性的业务。 IPTV uses Transmission Control Protocol/Internet Protocol (TCP/IP) as a bearer protocol for unicast, broadcast or multicast video services, effectively combining the three areas of TV network, telephone network and Internet. Representative business.
IP多媒体子系统（IMS, IP Mul t imedia Subsys tem )是一个独立于接入 技术的基于 IP的标准体系， IMS与现存的语音和数据网络（不论是如 PSTN, ISDN, 因特网等固定网络， 还是如 GSM、 CDMA等移动网络）都可以互通。 IMS 体系使得通过各种类型的用户设备 ( UE )都可以建立对等的 IP通信， 并可以 获得所需要的服务质量。 除会话管理之外， IMS体系还涉及完成服务提供所必 须的功能（例如注册、 安全、 计费、 承载控制、 漫游）。 即 IMS体系构成了 IP 核心网的核心。  IP Multimedia Subsystem (IMS) is an IP-based standard system independent of access technology, IMS and existing voice and data networks (whether fixed networks such as PSTN, ISDN, Internet, etc.) Mobile networks such as GSM and CDMA can be interoperable. The IMS architecture enables peer-to-peer IP communications through various types of User Equipments (UEs) and the quality of service required. In addition to session management, the IMS architecture also involves the functions necessary to complete service provisioning (eg registration, security, billing, bearer control, roaming). That is, the IMS system forms the core of the IP core network.
为了实现 IMS对固定网络用户接入的统一控制， 在网络架构中引入了网 络附着子系统 ( NASS , Network At tachment Sub - Sys tem )和资源与接纳控 制子系统 ( RACS , Resource and Admi s s ion Control Subsys tem )。 NASS用于 完成对 UE附着于接入网络的管理， 包括用户验证和网络地址分配、位置管理。 RACS则主要用于完成策略控制、 资源预留和接纳控制， 业务 /应用层面可利用 RACS请求接入网预留相关的资源。  In order to realize the unified control of IMS access to fixed network users, a network attachment subsystem (NASS, Network At tachment Sub-System) and a resource and admission control subsystem (RACS, Resource and Admi ss ion Control) are introduced in the network architecture. Subsys tem). The NASS is used to complete the management of the UE attaching to the access network, including user authentication and network address allocation, and location management. RACS is mainly used to complete policy control, resource reservation and admission control. The service/application level can use the RACS to request the access network to reserve related resources.
基于 IMS的 IPTV架构， 将直接重用 IMS的相关功能实体， 并通过适当增 加新的功能实体以及对现有功能实体相关功能的扩充， 实现对 IPTV业务的支 持。 The IMS-based IPTV architecture will directly reuse the relevant functional entities of IMS, and realize the support for IPTV services by appropriately adding new functional entities and expanding the related functions of existing functional entities. Hold.
图 1示出了现有技术中基于 IMS的 IPTV架构的一种组网示意图。 如图 1 所示， 每一个 IPTV业务由一对 IPTV业务控制功能（SCF, Service Control Functions )和 IPTV媒体功能 （MF, Media Functions )组成。 其中， SCF是 一种会话初始协议（SIP, Session Initiation Protocol )应用服务器， 作 为业务提供实体， 其任务主要包括： （1)会话初始化时进行授权； （2)实施修 改流程， 检查用户的数据， 以决定是否允许用户访问该业务； （3)账号控制； (4)选择相应的 MF。 MF作为媒体资源服务器， 负责媒体流的控制和递交， 可 被分为媒体控制功能（MCF)和媒体递交功能（MDF)。 其中， MCF 的任务主要 包括： （1)处理媒体流的控制； （2)监视 MDF的状态 (可选）； (3)管理和 UE的 交互； （4)在 MCF控制多个 MDF时， 选择一个 MDF; (5)感知不同 MDF的状态和 内容的分发； （5)产生计费信息。 MDF的任务主要包括： （1)处理媒体流的递交； (2)上报状态给 MCF  FIG. 1 shows a networking diagram of an IMS-based IPTV architecture in the prior art. As shown in Figure 1, each IPTV service consists of a pair of IPTV Service Control Functions (SCF) and IPTV Media Functions (MF). The SCF is a Session Initiation Protocol (SIP) application server, and serves as a service providing entity. The tasks include: (1) Authorization during session initialization; (2) Implementing a modification process to check user data. To decide whether to allow users to access the service; (3) account control; (4) select the corresponding MF. As a media resource server, MF is responsible for the control and delivery of media streams. It can be divided into media control function (MCF) and media delivery function (MDF). Among them, the tasks of the MCF mainly include: (1) processing the control of the media stream; (2) monitoring the state of the MDF (optional); (3) managing the interaction with the UE; (4) selecting when the MCF controls multiple MDFs An MDF; (5) perceiving the distribution of the status and content of different MDFs; (5) generating billing information. The tasks of MDF mainly include: (1) processing the delivery of media streams; (2) reporting status to MCF
在流媒体应用中， UE 通过与 MCF 建立实时流协议 ( Real Time Stream Protocol, RTSP ) 控制通道， 控制媒体流实现卡带式影像录放机 （ Video Cassette Recording, VCR)操作， 包括快进、 后退、 暂停、 定位、 正常播放 等。 某些情况下， 运营商或业务提供商希望通过 SCF 实现对指定的媒体流进 行 VCR控制操作。 而目前的 IPTV中没有相关技术实现 SCF对媒体流的控制操 作， 因此， 需要提出一种技术方案， 使得 SCF能够对媒体流进行 VCR控制操 作。 如果 SCF和 UE都能够对媒体流进行控制操作， 则会出现 VCR控制冲突， 因此还需要解决所述 VCR冲突的问题。 发明内容  In the streaming media application, the UE establishes a Real Time Stream Protocol (RTSP) control channel with the MCF to control the media stream to implement Video Cassette Recording (VCR) operations, including fast forward and backward. Pause, position, play normally, etc. In some cases, the operator or service provider wants to implement VCR control on the specified media stream through SCF. However, there is no related technology in the current IPTV to implement the SCF control operation on the media stream. Therefore, it is necessary to propose a technical solution that enables the SCF to perform VCR control operations on the media stream. If both the SCF and the UE can control the media stream, a VCR control conflict occurs, so the VCR conflict problem needs to be solved. Summary of the invention
有鉴于此， 本发明实施例提出一种业务提供实体对媒体流控制的方法， 能够实现业务提供实体对媒体流的控制。 用户设备与媒体资源服务器之间存 在媒体流连接， 包括如下步骤：  In view of this, the embodiment of the present invention provides a method for controlling a media flow by a service providing entity, which can implement control of a media stream by a service providing entity. There is a media stream connection between the user equipment and the media resource server, including the following steps:
业务提供实体发起对媒体流的控制操作； 所述对媒体流的控制操作由媒体资源服务器执行。 The service providing entity initiates a control operation on the media stream; The control operation on the media stream is performed by a media resource server.
本发明实施例还提出另一种业务提供实体对媒体流控制的方法， 用户设 备与媒体资源服务器之间存在媒体流连接以及 RTSP控制通道，包括如下步骤: 业务提供实体控制媒体资源服务器执行禁止用户终端的媒体流控制操 作；  The embodiment of the present invention further provides another method for controlling the media flow by the service providing entity. The media stream connection and the RTSP control channel exist between the user equipment and the media resource server, and the method includes the following steps: The service providing entity controls the media resource server to execute the prohibiting user. Media stream control operation of the terminal;
业务提供实体发起对媒体流的控制操作；  The service providing entity initiates a control operation on the media stream;
业务提供实体控制媒体资源服务器执行恢复用户设备的媒体流控制操 作。  The service providing entity controls the media resource server to perform media stream control operations for restoring the user equipment.
本发明实施例还提出一种业务提供实体对媒体流控制的系统， 包括： 媒体资源服务器， 用于与用户设备建立媒体流；  The embodiment of the present invention further provides a system for controlling a media stream by a service providing entity, including: a media resource server, configured to establish a media stream with the user equipment;
业务提供实体， 用于向所述媒体资源服务器发送对所述媒体流的控制命 令；  a service providing entity, configured to send, to the media resource server, a control command for the media stream;
所述媒体资源服务器还用于根据所述业务提供实体的控制命令， 对媒体 流进行控制操作。  The media resource server is further configured to perform a control operation on the media stream according to a control command of the service providing entity.
本发明实施例还提出一种业务提供实体， 包括：  An embodiment of the present invention further provides a service providing entity, including:
媒体流控制模块， 用于向媒体资源服务器发起对媒体流的控制操作。 从以上技术方案可以看出， 业务提供实体通过暂时禁止用户设备的媒体 流控制操作， 然后业务提供实体向媒体资源服务器发送媒体流控制命令， 可 以实现在某些业务场景下业务提供实体控制指定媒体流进行后退、 快进、 暂 停、 定位的操作。 附图说明  The media stream control module is configured to initiate a control operation on the media stream to the media resource server. It can be seen from the foregoing technical solution that the service providing entity temporarily controls the media stream control operation of the user equipment, and then the service providing entity sends a media flow control command to the media resource server, so that the service providing entity controls the specified media in some service scenarios. The flow performs operations of backing, fast forward, pause, and positioning. DRAWINGS
图 1为现有技术中基于 IMS的 IPTV架构的一种组网示意图；  FIG. 1 is a schematic diagram of networking of an IMS-based IPTV architecture in the prior art;
图 2为本发明实施例的基本架构流程图；  2 is a flowchart of a basic architecture of an embodiment of the present invention;
图 3为本发明第一实施例的信令流程图；  3 is a signaling flowchart of a first embodiment of the present invention;
图 4为本发明第二实施例的信令流程图；  4 is a signaling flowchart of a second embodiment of the present invention;
图 5为媒体控制的通用架构； 图 6为本发明第三实施例的信令流程图； Figure 5 is a general architecture of media control; 6 is a signaling flowchart of a third embodiment of the present invention;
图 7为本发明第四实施例的信令流程图；  7 is a signaling flowchart of a fourth embodiment of the present invention;
图 8为本发明第五实施例的信令流程图；  8 is a signaling flowchart of a fifth embodiment of the present invention;
图 9为本发明第六实施例的信令流程图；  9 is a signaling flowchart of a sixth embodiment of the present invention;
图 10为本发明实施例中的业务提供实体结构框图；  FIG. 10 is a structural block diagram of a service providing entity in an embodiment of the present invention;
图 11为本发明实施例中的实现业务提供实体对媒体流控制的系统结构框 图。  FIG. 11 is a block diagram of a system structure for implementing control of a media stream by a service providing entity according to an embodiment of the present invention.
具体实施方式 detailed description
为使本发明的目的、 技术方案和优点更加清楚， 下面结合附图对本发明 作进一步的详细阐述。  In order to make the objects, technical solutions and advantages of the present invention more comprehensible, the present invention will be further described in detail with reference to the accompanying drawings.
以 TI SPAN的 IPTV架构为例， 本发明实施例中的业务提供实体为业务控 制功能实体 SCF , 媒体资源服务器为媒体功能实体 MF。 而媒体功能实体 MF可 以包括媒体控制功能实体 MCF和媒体交付功能实体 MDF。 业务开展过程中， 业 务控制功能实体 SCF与媒体控制功能实体 MCF进行交互实现业务， 媒体控制 功能实体 MCF控制媒体交付功能实体 MDF完成媒体处理和交付。 本发明实施 例中， 不再描述 MDF与 MCF之间的交互过程， 而将两者作为整体描述为 MF。  Taking the IPTV architecture of the TI SPAN as an example, the service providing entity in the embodiment of the present invention is a service control function entity SCF, and the media resource server is a media function entity MF. The media function entity MF may include a media control function entity MCF and a media delivery function entity MDF. During the business development process, the business control function entity SCF interacts with the media control function entity MCF to implement the service, and the media control function entity MCF controls the media delivery function entity MDF to complete media processing and delivery. In the embodiment of the present invention, the interaction process between the MDF and the MCF is not described, and the two are described as MF as a whole.
在 IMS架构中， 本发明实施例中的业务提供实体为应用服务器 AS , 媒体 资源服务器为媒体资源功能实体 MRF。而媒体资源功能实体 MRF包括媒体资源 功能控制实体 MRFC和媒体资源功能处理实体 MRFP。 业务开展过程中，应用服 务器 AS与媒体资源功能控制实体 MRFC进行交互实现业务， 媒体资源功能控 制实体 MRFC控制媒体资源功能处理实体 MRFP完成媒体处理和交付。  In the IMS architecture, the service providing entity in the embodiment of the present invention is an application server AS, and the media resource server is a media resource function entity MRF. The media resource function entity MRF includes a media resource function control entity MRFC and a media resource function processing entity MRFP. During the service development process, the application server AS interacts with the media resource function control entity MRFC to implement the service, and the media resource function control entity MRFC controls the media resource function processing entity MRFP to complete media processing and delivery.
以下以 TI SPAN IPTV为业务场景描述实施例， 其相关流程同样可应用于 IMS架构下 AS与 MRFC的交互， 在实施例中就不再重复描述。  The following describes the embodiment of the SPAN IPTV as a service scenario. The related process is also applicable to the interaction between the AS and the MRFC in the IMS architecture. The description is not repeated in the embodiment.
本发明方案的第一个目的就是实现 SCF对媒体流进行后退、 快进、 暂停、 定位等 VCR控制操作。 图 2示出了本发明方案的总体流程框架， 在 UE与 MF 之间已经存在媒体流连接的情况下， 执行如下步骤： 步骤 201a: SCF业务触发， 发起对 UE与 MF间媒体流的控制； 步骤 202a: SCF发起媒体流的控制操作； The first object of the solution of the present invention is to implement VCF control operations such as back-off, fast-forward, pause, and positioning of the media stream by the SCF. Figure 2 shows the overall process framework of the solution of the present invention. In the case that there is already a media stream connection between the UE and the MF, the following steps are performed: Step 201a: The SCF service is triggered to initiate control of the media stream between the UE and the MF. Step 202a: The SCF initiates a control operation of the media stream.
步骤 203a: MF执行所述对媒体流的控制操作。  Step 203a: The MF performs the control operation on the media stream.
本发明方案的另一个目的是解决 SCF与 UE同时进行媒体流 VCR控制所引 起的 VCR控制冲突。 在 UE与 MF之间已经存在媒体流以及 RTSP控制通道的情 况下， 执行如下步骤：  Another object of the solution of the present invention is to solve the VCR control conflict caused by the SCF and the UE simultaneously performing media stream VCR control. In the case where the media stream and the RTSP control channel already exist between the UE and the MF, perform the following steps:
步骤 201b: 在 SCF发起媒体流的控制操作之前， SCF发起禁止所述 UE与 MF之间的控制通道；  Step 201b: Before the SCF initiates a control operation of the media stream, the SCF initiates a control channel between the UE and the MF.
步骤 202b: 在 SCF发起媒体流的控制操作之后， SCF发起激活所述 UE与 MF之间的控制通道。  Step 202b: After the SCF initiates a control operation of the media stream, the SCF initiates activation of a control channel between the UE and the MF.
上述两个方案也可以一起使用， 简单地说， 就是将步骤 201b添加到步骤 201a和步骤 202a之间， 而将步骤 202b添加到步骤 203a之后。  The above two schemes can also be used together. Briefly, step 201b is added between step 201a and step 202a, and step 202b is added after step 203a.
根据具体实现方式的不同， 下面通过三个实施例对实现 SCF的 VCR操作 进行详细阐述。  Depending on the implementation, the VCR operation of the SCF is described in detail through three embodiments.
实施例一： RTSP控制方式  Embodiment 1: RTSP control mode
RTSP是应用级协议，控制实时数据的发送。 RTSP提供了一个可扩展框架， 使实时数据（如音频与视频） 的受控、 点播传送成为可能。 数据源包括现场 数据（如直播）与存储在剪辑中数据（如 V0D等）。 该协议目的在于控制多个 数据传送会话，提供选择传送通道的方法，传送通道如 UDP、组播 UDP与 TCP, 提供基于 RTP选择传输机制的方法。  RTSP is an application-level protocol that controls the delivery of real-time data. RTSP provides an extensible framework that enables controlled, on-demand delivery of real-time data such as audio and video. Data sources include live data (such as live broadcasts) and data stored in clips (such as V0D, etc.). The purpose of the protocol is to control multiple data transfer sessions, providing a method for selecting a transport channel, such as UDP, multicast UDP, and TCP, to provide a method based on the RTP selective transport mechanism.
RTSP控制方式包括：  RTSP control methods include:
1、 SCF与 MF通过会话描述协议（ SDP, Session Description Protocol ) 协商， 建立一个 SCF与 MF间的 RTSP通道与被控制的媒体流之间的关联；  1. The SCF negotiates with the MF through a Session Description Protocol (SDP) to establish an association between the RTSP channel between the SCF and the MF and the controlled media stream.
2、 SCF通过 RTSP通道控制媒体流；  2. The SCF controls the media stream through the RTSP channel;
3、 完成控制操作后， 释放 SCF与 MF间的 RTSP通道， 基于通道重用等原 因， RTSP通道也可以不释放。  3. After the control operation is completed, the RTSP channel between the SCF and the MF is released. Based on the channel reuse and other reasons, the RTSP channel may not be released.
本实施例的具体实现流程如图 3所示， 包括如下步骤： 步骤 301 ~ 306： UE通过 SCF与 MF进行 SIP SDP交互， 建立了媒体流。 步骤 307: SCF上触发业务， 需要发起对 UE媒体流的控制。 The specific implementation process of this embodiment is shown in FIG. 3, and includes the following steps: Steps 301 ~ 306: The UE performs SIP SDP interaction with the MF through the SCF, and establishes a media stream. Step 307: The service is triggered on the SCF, and the control of the media stream of the UE needs to be initiated.
步骤 308: SCF向 MF发送会话内邀请 ( INVITE ) 消息， 携带 SDP offer , 新建一个 SCF与 MF间的 RTSP控制通道，  Step 308: The SCF sends an intra-session invite (INVITE) message to the MF, carries the SDP offer, and creates a new RTSP control channel between the SCF and the MF.
下面给出该邀请消息的一个示例：  An example of this invitation message is given below:
INVITE sip:MF.example.com SIP/2.0  INVITE sip: MF.example.com SIP/2.0
Via: ...  Via: ...
Route: ...  Route: ...
Max-Forwards: ...  Max-Forwards: ...
From: ...  From: ...
To: ...  To: ...
Call-ID: ...  Call-ID: ...
CSeq: ... v=0  CSeq: ... v=0
o=SCF 20000000 20000001 IN IP4 scf.example.com o=SCF 20000000 20000001 IN IP4 scf.example.com
s= s=
c=IN IP4 uehost.example.com c=IN IP4 uehost.example.com
t=0 0 t=0 0
m=video 30100 RTP/AVP 31 32 m=video 30100 RTP/AVP 31 32
a=rtpmap:31 H261/90000 a=rtpmap:31 H261/90000
a=label: l a=label: l
m=application 9 TCP/RTSP rtsp m=application 9 TCP/RTSP rtsp
a=fmtp:rtsp version: 2.0 a=fmtp:rtsp version: 2.0
a=rtspid m-stream: 1 a=rtspid m-stream: 1
m=application 9 TCP/RTSP rtsp /* 新建的 SCF与 MF间的 RTSP通道 */ m=application 9 TCP/RTSP rtsp /* New RTSP channel between SCF and MF */
c=IN IP4 scf.example.com c=IN IP4 scf.example.com
a=fmtp:rtsp version: 2.0 a=fmtp:rtsp version: 2.0
a=rtspid m-stream: 1 a=rtspid m-stream: 1
a=connection:new a=connection:new
a=setup: active a=setup: active
步骤 309： MF返回 200 OK, 携带 SDP应答 ( SDP answer )0 Step 309: MF returns 200 OK, carries SDP answer (SDP answer) 0
下面给出所述 200 OK消息的一个示例：  An example of the 200 OK message is given below:
SIP/2.0 200 OK  SIP/2.0 200 OK
Via: ... Via: ...
Max-Forwards: ... From: ... Max-Forwards: ... From: ...
To: ... To: ...
Call-ID: . Call-ID: .
CSeq: ... v=0 CSeq: ... v=0
o=MF 30000000 30000000 IN IP4 MF.example.com o=MF 30000000 30000000 IN IP4 MF.example.com
s= s=
c=IN IP4 MF.example.com c=IN IP4 MF.example.com
t=0 0 t=0 0
m=video 50100 RTP/AVP 31 32 m=video 50100 RTP/AVP 31 32
a=rtpmap:31 H261/90000 a=rtpmap:31 H261/90000
a=label: l a=label: l
m=application 60010 TCP RTSP rtsp m=application 60010 TCP RTSP rtsp
a=fmtp:rtsp version: 2.0 a=fmtp:rtsp version: 2.0
a=rtspid m-stream: 1 a=rtspid m-stream: 1
m=application 60020 TCP RTSP rtsp /* 新建的 SCF与 MF间的 RTSP通道 */ m=application 60020 TCP RTSP rtsp /* New RTSP channel between SCF and MF */
a=fmtp:rtsp version: 2.0 a=fmtp:rtsp version: 2.0
a=rtspid m-stream: 1 a=rtspid m-stream: 1
a=connection:new a=connection:new
a=setup:passive a=setup:passive
步骤 310： SCF发送 ACK确认， SCF与 MF间建立 RTSP通道。  Step 310: The SCF sends an ACK acknowledgement, and an RTSP channel is established between the SCF and the MF.
步骤 311 : SCF通过所述 RTSP通道向 MF发送 RTSP命令控制媒体流， MF 执行所述命令， 进行相应的 VCR操作。  Step 311: The SCF sends an RTSP command to the MF to control the media stream through the RTSP channel, and the MF executes the command to perform a corresponding VCR operation.
步骤 312： SCF向 MF发送会话内 INVITE消息， 携带 SDP offer , 将新建 的 SCF与 MF间的 RTSP通道释放； 某些场景下基于通道重用的考虑也可以不 释放该 RTSP通道。  Step 312: The SCF sends an intra-session INVITE message to the MF, and carries the SDP offer to release the RTSP channel between the newly created SCF and the MF. In some scenarios, the channel reuse may not release the RTSP channel.
下面给出所述 INVITE消息的一个示例：  An example of the INVITE message is given below:
INVITE sip:MF.example.com SIP/2.0  INVITE sip: MF.example.com SIP/2.0
Via: ...  Via: ...
Route: ...  Route: ...
Max-Forwards: ...  Max-Forwards: ...
From: ...  From: ...
To: ...  To: ...
Call-ID: ...  Call-ID: ...
CSeq: ... v=0 CSeq: ... V=0
o=SCF 20000000 20000002 IN IP4 scf.example.com o=SCF 20000000 20000002 IN IP4 scf.example.com
s= s=
c=IN IP4 uehost. example, com c=IN IP4 uehost. example, com
t=0 0 t=0 0
m=video 30100 RTP/AVP 31 32 m=video 30100 RTP/AVP 31 32
a=rtpmap:31 H261/90000 a=rtpmap:31 H261/90000
a=label: l a=label: l
m=application 9 TCP/RTSP rtsp m=application 9 TCP/RTSP rtsp
a=fmtp:rtsp version: 2.0 a=fmtp:rtsp version: 2.0
a=rtspid m-stream: 1 a=rtspid m-stream: 1
m=application 0 TCP/RTSP rtsp /* 将新建的 SCF与 MF间的 RTSP通道释放 */ c=IN IP4 scf.example.com m=application 0 TCP/RTSP rtsp /* Releases the RTSP channel between the newly created SCF and MF */ c=IN IP4 scf.example.com
a=fmtp:rtsp version: 2.0 a=fmtp:rtsp version: 2.0
a=rtspid m-stream: 1 a=rtspid m-stream: 1
a=connection:new a=connection:new
a=setup: active a=setup: active
步骤 313: MF返回 200 OK, 携带 SDP answer。  Step 313: MF returns 200 OK, carrying SDP answer.
下面给出所述 200 OK消息的一个示例：  An example of the 200 OK message is given below:
SIP/2.0 200 OK  SIP/2.0 200 OK
Via: ... Via: ...
Max-Forwards: ...  Max-Forwards: ...
From: ... From: ...
To: ... To: ...
Call-ID: ... Call-ID: ...
CSeq: ... v=0 CSeq: ... v=0
o=MF 30000000 30000000 IN IP4 MF.example.com o=MF 30000000 30000000 IN IP4 MF.example.com
s= s=
c=IN IP4 MF.example.com c=IN IP4 MF.example.com
t=0 0 t=0 0
m=video 50100 RTP/AVP 31 32 m=video 50100 RTP/AVP 31 32
a=rtpmap:31 H261/90000 a=rtpmap:31 H261/90000
a=label: l a=label: l
m=application 60010 TCP RTSP rtsp m=application 60010 TCP RTSP rtsp
a=fmtp:rtsp version: 2.0 a=rtspid m-stream: 1 a=fmtp:rtsp version: 2.0 a=rtspid m-stream: 1
m=application 0 TCP/RTSP rtsp /* 将新建的 SCF与 MF间的 RTSP通道释 m=application 0 TCP/RTSP rtsp /* Interpret the RTSP channel between the newly created SCF and MF
放 */ Put */
a=fmtp:rtsp version: 2.0 a=fmtp:rtsp version: 2.0
a=rtspid m-stream: 1 a=rtspid m-stream: 1
a=connection:new a=connection:new
步骤 314： SCF发送 ACK确认。  Step 314: The SCF sends an ACK confirmation.
通过以上流程， 实现了 SCF通过 RTSP控制通道对 UE与 MF之间的媒体流 进行控制操作。  Through the above process, the SCF controls the media stream between the UE and the MF through the RTSP control channel.
实施例二： SIP消息控制方式  Embodiment 2: SIP message control mode
SIP是由 Interne工程任务组（ IETF )制订的多媒体通信系统框架协议之 一，是用于建立、改变或结束多媒体会话的应用层协议，与实时传输协议（ RTP, Rea l Timing Transmi s s ion Protoco l ) /实时传输控制协议 ( RTCP , Rea l-t ime Transpor t Control Protocol ), SDP、 RTSP , 域名系统 ( DNS , Doma in Name Sys tem )等协议配合， 共同完成 IMS 中的会话建立及媒体协商； 一旦建立会 话， 媒体流将使用 RTP协议在承载层中直接传送， 在一次会话中可以灵活的 交互多种媒体。  SIP is one of the multimedia communication system framework protocols developed by the Interne Engineering Task Force (IETF). It is an application layer protocol for establishing, changing or ending multimedia sessions, and real-time transport protocols (RTP, Rea l Timing Transmi ss ion Protoco l / Real-time Transmission Control Protocol (RTCP, Rea lt ime Transpor Control Protocol), SDP, RTSP, Domain Name System (DNS, Doma in Name System) and other protocols cooperate to complete session establishment and media negotiation in IMS; Sessions, media streams will be transmitted directly in the bearer layer using the RTP protocol, and multiple media can be flexibly interacted in one session.
SIP消息控制方式包括：  SIP message control methods include:
SCF向 MF发送关联媒体流所属会话的 S IP消息， 该 SIP消息中携带控制 指示， 用于控制媒体流； 所述控制指示包括： 快进、 后退、 暂停、 定位、 正 常播放等；  The SCF sends an S IP message to the MF to which the associated media stream belongs, and the SIP message carries a control indication for controlling the media stream. The control indication includes: fast forward, backward, pause, locate, normal play, and the like;
本实施例的具体实现流程如图 4所示， 包括如下步骤：  The specific implementation process of this embodiment is shown in FIG. 4, and includes the following steps:
步骤 401 - 406: UE通过 SCF与 MF进行 SIP SDP交互， 建立媒体流。 步骤 407: SCF上触发业务， 发起对 UE媒体流的控制。  Steps 401 - 406: The UE performs SIP SDP interaction with the MF through the SCF to establish a media stream. Step 407: Trigger a service on the SCF, and initiate control of the UE media stream.
步骤 408: SCF向 MF发送携带后退指示的 INF0消息， 控制媒体流后退； 步骤 409： MF返回 200 0K响应消息；  Step 408: The SCF sends an INF0 message carrying the back indication to the MF, and controls the media stream to go backward. Step 409: The MF returns a 200 0K response message.
步骤 410: SCF向 MF发送携带定位指示的 INF0消息， 控制媒体流定位； 步骤 411 : MF返回 200 0K响应消息;  Step 410: The SCF sends an INF0 message carrying the positioning indication to the MF, and controls media stream positioning. Step 411: The MF returns a 200 0K response message.
步骤 412: SCF向 MF发送携带正常播放指示的 INF0消息， 控制媒体流正 -οι - w^m z mm Step 412: The SCF sends an INF0 message carrying a normal play indication to the MF, and controls the media stream to be positive. -οι - w^mz mm
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</fastmove>  </fastmove>
</rtsp-control> </rtsp-control>
当然， 还存在其它的方式描述媒体流的控制指示。 如通过已有的 SIP 头 域或定义新的 SIP 头域携带指示， 但其表达的思想类似， 在此就不在重复举 例。 使用 SIP INFO消息只是一种实施例， 其它 SIP消息， 如 MESSAGE也可用 在该流程中替换 INFO实现相同的功能， 在此就不在重复举例。  Of course, there are other ways to describe the control indication of the media stream. If the indication is carried through the existing SIP header field or by defining a new SIP header field, but the expression is similar, the repeated examples are not repeated here. The use of SIP INFO messages is only an embodiment. Other SIP messages, such as MESSAGE, can also be used in this process to replace INFO to achieve the same function, and the repeated examples are not used here.
实施例三： 媒体控制消息方式  Embodiment 3: Media Control Message Mode
IETF的一个草案 ( draf t_boul ton_s ip_control_f ramework_04. txt ) 定 义了一个媒体控制的通用架构， 如图 5 所示， 该架构定义了三个逻辑角色： 媒体控制服务器 ( Control Server ), 媒体控制客户端 ( Control Cl ient )和 媒体控制通道（Control Channe l ), 其中，  A draft of the IETF ( draf t_boul ton_s ip_control_f ramework_04. txt ) defines a common architecture for media control. As shown in Figure 5, the architecture defines three logical roles: Media Control Server (Control Server), Media Control Client ( Control Cl ient ) and the Media Control Channel (Control Channe l ), where
媒体控制服务器为逻辑实体， 用于接受媒体控制客户端的媒体处理请求 消息， 执行具体的媒体处理操作， 如： 放音、 录音、 媒体混合等；  The media control server is a logical entity for accepting media processing request messages of the media control client, and performing specific media processing operations, such as: playing, recording, media mixing, etc.;
媒体控制客户端为逻辑实体， 向媒体控制服务器发送消息， 请求处理媒 体资源；  The media control client is a logical entity, and sends a message to the media control server to request processing of the media resource;
媒体控制通道为媒体控制客户端通过 SIP 与媒体控制服务器间进行 SDP 交互， 协商建立的基于可靠连接的传递控制消息的通道。  The media control channel is a channel for the media control client to perform SDP interaction between the SIP and the media control server, and negotiate a reliable connection-based delivery control message.
该架构中， 媒体控制客户端与媒体控制服务器通过 S IP SDP 交互建立媒 体控制通道， 媒体控制客户端通过媒体控制通道向媒体控制服务器发送媒体 控制消息， 实现媒体控制处理。 在基于 TISPAN的 IPTV架构中， MF为媒体控 制服务器， SCF为媒体控制客户端； 在 IMS系统中， MRF为媒体控制服务器， AS为媒体控制客户端。  In the architecture, the media control client and the media control server establish a media control channel through the S IP SDP interaction, and the media control client sends a media control message to the media control server through the media control channel to implement media control processing. In the TISPAN-based IPTV architecture, the MF is the media control server and the SCF is the media control client. In the IMS system, the MRF is the media control server and the AS is the media control client.
媒体控制消息方式包括：  Media control messages include:
1、 如果待控制的媒体流所属的 SCF与 MF间的媒体会话没有对应的媒体 控制通道， SCF与 MF通过 SDP协商建立一个对应该媒体会话的媒体控制通道 2;  1. If the media session between the SCF and the MF to which the media stream to be controlled belongs does not have a corresponding media control channel, the SCF and the MF negotiate to establish a media control channel 2 corresponding to the media session through SDP negotiation;
1、 SCF通过通道 2向 MF发送媒体控制消息携带控制指示控制媒体流； 这 样的控制指示包括： 快进、 后退、 暂停、 定位、 正常播放等。 1. The SCF sends a media control message carrying control indication to the MF through channel 2 to control the media stream; Such control instructions include: fast forward, backward, pause, position, normal play, and so on.
3、 释放 SCF与 MF间新建的媒体控制通道即通道 2 , 基于某些原因，例如 通道重用等， 媒体控制通道也可以不释放。  3. Release the new media control channel between SCF and MF, channel 2. For some reasons, such as channel reuse, the media control channel may not be released.
本实施例的具体实现流程如图 6所示， 包括如下步骤：  The specific implementation process of this embodiment is shown in FIG. 6, and includes the following steps:
步骤 601 ~ 606： UE通过 SCF与 MF进行 SIP SDP交互， 建立了媒体流和 Steps 601 ~ 606: The UE performs SIP SDP interaction with the MF through the SCF, and establishes a media stream and
RTSP控制通道。 RTSP control channel.
步骤 607: SCF上触发业务， 需发起对 UE媒体流的控制；  Step 607: Trigger a service on the SCF, and initiate a control on the UE media stream.
步骤 608: SCF向 MF发送会话内 INVITE消息， 携带 SDP offer , 通过 SDP 协商建立媒体控制通道。  Step 608: The SCF sends an intra-session INVITE message to the MF, carries the SDP offer, and establishes a media control channel through SDP negotiation.
下面给出所述 INVITE消息的一个示例：  An example of the INVITE message is given below:
INVITE sip:MF.example.com SIP/2.0  INVITE sip: MF.example.com SIP/2.0
Via: ...  Via: ...
Route: ...  Route: ...
Max-Forwards: ...  Max-Forwards: ...
From: ...  From: ...
To: ...  To: ...
Call-ID: ...  Call-ID: ...
CSeq: ... v=0  CSeq: ... v=0
o=SCF 20000000 20000001 IN IP4 scf.example.com o=SCF 20000000 20000001 IN IP4 scf.example.com
s= s=
c=IN IP4 uehost.example.com c=IN IP4 uehost.example.com
t=0 0 t=0 0
m=video 30100 RTP/AVP 31 32 m=video 30100 RTP/AVP 31 32
a=rtpmap:31 H261/90000 a=rtpmap:31 H261/90000
a=label: l a=label: l
m=application 9 TCP/RTSP rtsp m=application 9 TCP/RTSP rtsp
a=fmtp:rtsp version: 2.0 a=fmtp:rtsp version: 2.0
a=rtspid m-stream: 1 a=rtspid m-stream: 1
m=application 7575 TCP ESCS /* 新建的 SCF与 MF间的媒体控制通道 */ m=application 7575 TCP ESCS /* New media control channel between SCF and MF */
c=IN IP4 scf.example.com c=IN IP4 scf.example.com
a=setup: active a=setup: active
a=connection:new 步骤 609: MF返回 200 OK, 携带 SDP answer; a=connection:new Step 609: The MF returns 200 OK, carrying the SDP answer;
下面给出所述 200 OK消息的一个示例：  An example of the 200 OK message is given below:
SIP/2.0200 OK  SIP/2.0200 OK
Via: ... Via: ...
Max-Forwards: ...  Max-Forwards: ...
From: ... From: ...
To: ... To: ...
Call-ID: ... Call-ID: ...
CSeq: ... v=0 CSeq: ... v=0
o=MF 3000000030000000 IN IP4 MF.example.com o=MF 3000000030000000 IN IP4 MF.example.com
s= s=
c=IN IP4 MF.example.com c=IN IP4 MF.example.com
t=00 t=00
m=video 50100 RTP/AVP3132 m=video 50100 RTP/AVP3132
a=rtpmap:31 H261/90000 a=rtpmap:31 H261/90000
a=label:l a=label:l
m=application 60010 TCPRTSP rtsp m=application 60010 TCPRTSP rtsp
a=fmtp:rtsp version: 2.0 a=fmtp:rtsp version: 2.0
a=rtspid m-stream: 1 a=rtspid m-stream: 1
m=application 7563 TCPESCS /* 新建的 SCF与 MF间的媒体控制通道 */ m=application 7563 TCPESCS /* New media control channel between SCF and MF */
a=setup:passive a=setup:passive
a=connection:new a=connection:new
步骤 610: SCF发送 ACK确认， SCF与 MF间建立媒体控制通道； 步骤 611: SCF通过媒体控制通道向 MF发送媒体控制消息， 携带快进、 后退、 定位、 暂停、 正常播放指示， 控制媒体流；  Step 610: The SCF sends an ACK acknowledgement, and the media control channel is established between the SCF and the MF. Step 611: The SCF sends a media control message to the MF through the media control channel, and carries the fast forward, backward, locate, pause, and normal play indications to control the media stream.
步骤 612: SCF向 MF发送媒体控制消息 MRequest携带快进指示， 控制媒 体流快进；  Step 612: The SCF sends a media control message to the MF. The MRequest carries a fast forward indication, and controls the media stream to fast forward;
步骤 613: MF执行媒体流快进操作， 并返回 MResponse响应消息； 步骤 614: SCF向 MF发送媒体控制消息 MRequest携带暂停指示， 控制媒 体流暂停；  Step 613: The MF performs a media stream fast forward operation, and returns a MResponse response message. Step 614: The SCF sends a media control message to the MF. The MRequest carries a pause indication to control the media stream suspension.
步骤 615: MF执行媒体流暂停操作， 并返回 MResponse响应消息； 步骤 616: SCF结束对媒体流的控制， 向 MF发送会话内 INVITE消息， 携 带 SDP offer , 释放新建的媒体控制通道； 某些场景下媒体控制通道也可以不 释放， 因此该步骤可省略。 Step 615: The MF performs a media stream pause operation, and returns a MResponse response message. Step 616: The SCF ends the control of the media stream, and sends an intra-session INVITE message to the MF. With the SDP offer, the newly created media control channel is released; in some scenarios, the media control channel may not be released, so this step can be omitted.
下面给出所述 INVITE消息的一个示例：  An example of the INVITE message is given below:
INVITE sip:MF.example.com SIP/2.0  INVITE sip: MF.example.com SIP/2.0
Via: ...  Via: ...
Route: ...  Route: ...
Max-Forwards: ...  Max-Forwards: ...
From: ...  From: ...
To: ...  To: ...
Call-ID: ...  Call-ID: ...
CSeq: ... v=0  CSeq: ... v=0
o=SCF 20000000 20000002 IN IP4 scf.example.com o=SCF 20000000 20000002 IN IP4 scf.example.com
s= s=
c=IN IP4 uehost.example.com c=IN IP4 uehost.example.com
t=0 0 t=0 0
m=video 30100 RTP/AVP 31 32 m=video 30100 RTP/AVP 31 32
a=rtpmap:31 H261/90000 a=rtpmap:31 H261/90000
a=label: l a=label: l
m=application 9 TCP/RTSP rtsp m=application 9 TCP/RTSP rtsp
a=fmtp:rtsp version: 2.0 a=fmtp:rtsp version: 2.0
a=rtspid m-stream: 1 a=rtspid m-stream: 1
m=application 0 TCP ESCS /* 释放新建的 SCF与 MF间的媒体控制通道 */ m=application 0 TCP ESCS /* Release the media control channel between the newly created SCF and MF */
c=IN IP4 scf.example.com c=IN IP4 scf.example.com
a=setup: active a=setup: active
a=connection:new a=connection:new
步骤 617: MF返回 200 OK, 携带 SDP answer;  Step 617: MF returns 200 OK, carrying SDP answer;
下面给出所述 200 OK消息的一个示例：  An example of the 200 OK message is given below:
SIP/2.0 200 OK  SIP/2.0 200 OK
Via: ... Via: ...
Max-Forwards: ...  Max-Forwards: ...
From: ... From: ...
To: ... To: ...
Call-ID: ... Call-ID: ...
CSeq: ... v=0 CSeq: ... V=0
o=MF 30000000 30000000 IN IP4 MF.example.com o=MF 30000000 30000000 IN IP4 MF.example.com
s= s=
c=IN IP4 MF.example.com c=IN IP4 MF.example.com
t=0 0 t=0 0
m=video 50100 RTP/AVP 31 32 m=video 50100 RTP/AVP 31 32
a=rtpmap:31 H261/90000 a=rtpmap:31 H261/90000
a=label: l a=label: l
m=application 60010 TCP RTSP rtsp m=application 60010 TCP RTSP rtsp
a=fmtp:rtsp version: 2.0 a=fmtp:rtsp version: 2.0
a=rtspid m-stream: 1 a=rtspid m-stream: 1
m=application 0 TCP ESCS /* 释放新建的 SCF与 MF间的媒体控制通道 */ m=application 0 TCP ESCS /* Release the media control channel between the newly created SCF and MF */
a=setup:passive a=setup:passive
a=connection:new a=connection:new
步骤 618 : SCF发送 ACK确认。  Step 618: The SCF sends an ACK confirmation.
媒体控制消息携带媒体流的控制指示实施例可以釆用与 S IP 消息控制方 式实施类似的方案。  The control of the media control message carrying the media stream indicates that the embodiment can implement a similar scheme as the S IP message control method.
以下再通过三个实施例对避免 VCR操作冲突的实现过程进行详细阐述。 实施例四： SDP协商方式来避免 VCR操作冲突  The implementation process of avoiding VCR operation conflicts will be described in detail through three embodiments. Embodiment 4: SDP negotiation mode to avoid VCR operation conflicts
本实施例的具体实现流程如图 7所示， 包括如下步骤：  The specific implementation process of this embodiment is shown in FIG. 7, and includes the following steps:
步骤 701 ~ 706： UE通过 SCF与 MF进行 S IP SDP交互， 建立了媒体流和 Steps 701 ~ 706: The UE performs S IP SDP interaction with the MF through the SCF, and establishes a media stream and
RTSP控制通道 ( RTSP Channe l ) , 该 RTSP控制通道称为通道 1。 RTSP Control Channel (RTSP Channe l), this RTSP control channel is called channel 1.
步骤 707 : SCF上触发业务， 需要禁止 UE的 VCR操作。  Step 707: The service is triggered on the SCF, and the VCR operation of the UE needs to be prohibited.
步骤 708 : SCF向 MF发送会话内邀请 ( INVITE ) 消息， 携带 SDP offer , 将 UE的 RTSP通道即通道 1设为去激活状态。  Step 708: The SCF sends an intra-session invite (INVITE) message to the MF, carrying the SDP offer, and setting the UE's RTSP channel, channel 1, to the deactivated state.
下面给出该邀请消息的一个示例：  An example of this invitation message is given below:
INVITE sip:MF.example.com SIP/2.0  INVITE sip: MF.example.com SIP/2.0
Via: ...  Via: ...
Route: ...  Route: ...
Max-Forwards: ...  Max-Forwards: ...
From: ...  From: ...
To: ...  To: ...
Call-ID: ...  Call-ID: ...
CSeq: ... v=0 CSeq: ... V=0
o=SCF 20000000 20000001 IN IP4 scf.example.com o=SCF 20000000 20000001 IN IP4 scf.example.com
s= s=
c=IN IP4 uehost.example.com c=IN IP4 uehost.example.com
t=0 0 t=0 0
m=video 30100 RTP/AVP 31 32 m=video 30100 RTP/AVP 31 32
a=rtpmap:31 H261/90000 a=rtpmap:31 H261/90000
a=label: l a=label: l
m=application 9 TCP/RTSP rtsp m=application 9 TCP/RTSP rtsp
a=fmtp:rtsp version: 2.0 a=fmtp:rtsp version: 2.0
a=rtspid m-stream: l a=rtspid m-stream: l
a=inactive /* 将 UE的 RTSP通道设为去激活状态 */ a=inactive /* Set the UE's RTSP channel to deactivated */
步骤 709: MF返回 200 OK, 携带 SDP应答（SDP answer )。 下面给出所述 200 OK消息的一个示例： Step 709: The MF returns 200 OK, carrying an SDP answer (SDP answer). An example of the 200 OK message is given below:
SIP/2.0 200 OK  SIP/2.0 200 OK
Via: ... Via: ...
Max- Forwards: ...  Max- Forwards: ...
From: ... From: ...
To: ... To: ...
Call-ID: ... Call-ID: ...
CSeq: ... v=0 CSeq: ... v=0
o=MF 30000000 30000000 IN IP4 MF.example.com o=MF 30000000 30000000 IN IP4 MF.example.com
s= s=
c=IN IP4 MF.example.com c=IN IP4 MF.example.com
t=0 0 t=0 0
m=video 50100 RTP/AVP 31 32 m=video 50100 RTP/AVP 31 32
a=rtpmap:31 H261/90000 a=rtpmap:31 H261/90000
a=label: 1 a=label: 1
m=application 60010 TCP RTSP rtsp m=application 60010 TCP RTSP rtsp
a=fmtp:rtsp version: 2.0 a=fmtp:rtsp version: 2.0
a=rtspid m-stream:l a=rtspid m-stream:l
a=inactive I* 将 UE的 RTSP通道设为去激活状态 */ 步骤 710: SCF发送 ACK确认。 a=inactive I* Set the UE's RTSP channel to deactivated*/ Step 710: The SCF sends an ACK acknowledgement.
步骤 711： SCF向 UE发送会话内 INVITE消息， 携带 SDP offer , 将 UE的 RTSP通道设为去激活状态， 从而使 UE知道 RTSP通道被禁用；  Step 711: The SCF sends an intra-session INVITE message to the UE, carries the SDP offer, and sets the RTSP channel of the UE to an deactivated state, so that the UE knows that the RTSP channel is disabled.
以下给出所述 INVITE消息的一个示例：  An example of the INVITE message is given below:
INVITE si ： uehost. example. com SIP/2.0  INVITE si : uehost. example. com SIP/2.0
Via: ...  Via: ...
Route: ...  Route: ...
Max-Forwards: ...  Max-Forwards: ...
From: ...  From: ...
To: ...  To: ...
Call-ID: ...  Call-ID: ...
CSeq: ... v=0  CSeq: ... v=0
o=SCF 30000000 30000001 IN IP4 scf.example.com o=SCF 30000000 30000001 IN IP4 scf.example.com
s= s=
c=IN IP4 MFhost. example. com c=IN IP4 MFhost. example. com
t=0 0 t=0 0
m=video 50100 RTP/AVP 31 32 m=video 50100 RTP/AVP 31 32
a=rtpmap:31 H261/90000 a=rtpmap:31 H261/90000
a=label: l a=label: l
m=application 60010 TCP RTSP rtsp m=application 60010 TCP RTSP rtsp
a=fmtp:rtsp version: 2.0 a=fmtp:rtsp version: 2.0
a=rtspid m-stream: 1 a=rtspid m-stream: 1
a=inactive /* 将 UE的 RTSP通道设为去激活状态 */ a=inactive /* Set the UE's RTSP channel to deactivated */
步骤 712: UE返回 200 OK, 携带 SDP answer;  Step 712: The UE returns 200 OK, carrying the SDP answer;
以下给出所述 200 OK消息的一个示例：  An example of the 200 OK message is given below:
SIP/2.0 200 OK  SIP/2.0 200 OK
Via: ... Via: ...
Max-Forwards: ...  Max-Forwards: ...
From: ... From: ...
To: ... To: ...
Call-ID: ... Call-ID: ...
CSeq: ... v=0 o=UE 60000000 60000000 IN IP4 MF.example.com CSeq: ... v=0 o=UE 60000000 60000000 IN IP4 MF.example.com
s= s=
c=IN IP4 uehost.example.com c=IN IP4 uehost.example.com
t=0 0 t=0 0
m=video 80100 RTP/AVP 31 32 m=video 80100 RTP/AVP 31 32
a=rtpmap:31 H261/90000 a=rtpmap:31 H261/90000
a=label: l a=label: l
m=application 9 TCP/RTSP rtsp m=application 9 TCP/RTSP rtsp
a=fmtp:rtsp version: 2.0 a=fmtp:rtsp version: 2.0
a=rtspid m-stream: 1 a=rtspid m-stream: 1
a=inactive /* 将 UE的 RTSP通道设为去激活状态 */ a=inactive /* Set the UE's RTSP channel to deactivated */
步骤 713: SCF发送 ACK确认；  Step 713: The SCF sends an ACK confirmation.
步骤 714: SCF与 MF进行 SDP协商， 恢复 UE的 VCR操作；  Step 714: The SCF performs SDP negotiation with the MF to restore the VCR operation of the UE.
步骤 715： SCF向 MF发送会话内 INVITE消息， 携带 SDP offer , 将 UE的 RTSP通道设为激活状态；  Step 715: The SCF sends an intra-session INVITE message to the MF, carries the SDP offer, and sets the UE's RTSP channel to an active state.
以下给出所述 INVITE消息的一个示例：  An example of the INVITE message is given below:
INVITE sip:MF.example.com SIP/2.0  INVITE sip: MF.example.com SIP/2.0
Via: ...  Via: ...
Route: ...  Route: ...
Max-Forwards: ...  Max-Forwards: ...
From: ...  From: ...
To: ...  To: ...
Call-ID: ...  Call-ID: ...
CSeq: ... v=0  CSeq: ... v=0
o=SCF 20000000 20000002 IN IP4 scf.example.com o=SCF 20000000 20000002 IN IP4 scf.example.com
s= s=
c=IN IP4 uehost.example.com c=IN IP4 uehost.example.com
t=0 0 t=0 0
m=video 50100 RTP/AVP 31 32 m=video 50100 RTP/AVP 31 32
a=rtpmap:31 H261/90000 a=rtpmap:31 H261/90000
a=label: l a=label: l
m=application 9 TCP/RTSP rtsp m=application 9 TCP/RTSP rtsp
a=fmtp:rtsp version: 2.0 a=fmtp:rtsp version: 2.0
a=rtspid m-stream: 1 a=rtspid m-stream: 1
a=sendrecv /* 将 UE的 RTSP通道设为激活状态 */ 步骤 716 : MF返回 200 OK , 携带 SDP answer ; a=sendrecv /* Set the UE's RTSP channel to active*/ Step 716: The MF returns 200 OK and carries the SDP answer;
以下给出所述 200 OK消息的一个示例：  An example of the 200 OK message is given below:
SIP/2.0 200 OK  SIP/2.0 200 OK
Via: ... Via: ...
Max-Forwards: ...  Max-Forwards: ...
From: ... From: ...
To: ... To: ...
Call-ID: ... Call-ID: ...
CSeq: ... v=0 CSeq: ... v=0
o=MF 30000000 30000000 IN IP4 MF.example.com o=MF 30000000 30000000 IN IP4 MF.example.com
s= s=
c=IN IP4 MF.example.com c=IN IP4 MF.example.com
t=0 0 t=0 0
m=video 50100 RTP/AVP 31 32 m=video 50100 RTP/AVP 31 32
a=rtpmap:31 H261/90000 a=rtpmap:31 H261/90000
a=label: l a=label: l
m=application 60010 TCP RTSP rtsp m=application 60010 TCP RTSP rtsp
a=fmtp:rtsp version: 2.0 a=fmtp:rtsp version: 2.0
a=rtspid m-stream: 1 a=rtspid m-stream: 1
a=sendrecv /* 将 UE的 RTSP通道设为激活状态 */ a=sendrecv /* Set the UE's RTSP channel to active */
步骤 717 : SCF发送 ACK确认；  Step 717: The SCF sends an ACK acknowledgement;
步骤 718： SCF向 UE发送会话内 INVITE消息， 携带 SDP offer , 将 UE的 RTSP通道设为激活状态， 从而使 UE知道 RTSP通道可用；  Step 718: The SCF sends an intra-session INVITE message to the UE, carries the SDP offer, and sets the RTSP channel of the UE to an active state, so that the UE knows that the RTSP channel is available.
以下给出所述 INVITE消息的一个示例：  An example of the INVITE message is given below:
INVITE si ： uehost. example. com SIP/2.0  INVITE si : uehost. example. com SIP/2.0
Via: ...  Via: ...
Route: ...  Route: ...
Max-Forwards: ...  Max-Forwards: ...
From: ...  From: ...
To: ...  To: ...
Call-ID: ...  Call-ID: ...
CSeq: ... v=0 o=SCF 30000000 30000002 IN IP4 scf.example.com CSeq: ... v=0 o=SCF 30000000 30000002 IN IP4 scf.example.com
s= s=
c=IN IP4 MFhost. example. com c=IN IP4 MFhost. example. com
t=0 0 t=0 0
m=video 50100 RTP/AVP 31 32 m=video 50100 RTP/AVP 31 32
a=rtpmap:31 H261/90000 a=rtpmap:31 H261/90000
a=label: l a=label: l
m=application 60010 TCP RTSP rtsp m=application 60010 TCP RTSP rtsp
a=fmtp:rtsp version: 2.0 a=fmtp:rtsp version: 2.0
a=rtspid m-stream: l a=rtspid m-stream: l
a=sendrecv /* 将 UE的 RTSP通道设为激活状态 */ a=sendrecv /* Set the UE's RTSP channel to active */
步骤 719 : UE返回 200 OK , 携带 SDP answer ;  Step 719 : The UE returns 200 OK and carries the SDP answer ;
以下给出所述 200 0K消息的一个示例：  An example of the 200 0K message is given below:
SIP/2.0 200 OK  SIP/2.0 200 OK
Via: ... Via: ...
Max-Forwards: ...  Max-Forwards: ...
From: ... From: ...
To: ... To: ...
Call-ID: ... Call-ID: ...
CSeq: ... v=0 CSeq: ... v=0
o=UE 60000000 60000000 IN IP4 MF.example.com o=UE 60000000 60000000 IN IP4 MF.example.com
s= s=
c=IN IP4 uehost.example.com c=IN IP4 uehost.example.com
t=0 0 t=0 0
m=video 80100 RTP/AVP 31 32 m=video 80100 RTP/AVP 31 32
a=rtpmap:31 H261/90000 a=rtpmap:31 H261/90000
a=label: 1 a=label: 1
m=application 9 TCP/RTSP rtsp m=application 9 TCP/RTSP rtsp
a=fmtp:rtsp version: 2.0 a=fmtp:rtsp version: 2.0
a=rtspid m-stream: l a=rtspid m-stream: l
a=sendrecv I* 将 UE的 RTSP通道设为激活状态 *l a=sendrecv I* Set the UE's RTSP channel to active *l
步骤 720: SCF发送 ACK确认；  Step 720: The SCF sends an ACK confirmation.
上述实施例流程中 SCF分别向 MF和 UE发送会话内的 INVITE消息没有先 后顺序， 可以同时向 MF和 UE发送， 不必等 200 0K返回； SCF还可以向 MF和 UE发送更新 ( UPDATE ) 消息实现 SDP协商。 In the foregoing embodiment, the SCF sends the INVITE message in the session to the MF and the UE respectively, and the INVITE message can be sent to the MF and the UE at the same time, without waiting for 200 0K to return; the SCF can also send the MF to the MF and the MF. The UE sends an update (UPDATE) message to implement SDP negotiation.
第四实施例流程中给出了去激活 RTSP通道的一种方式， 还可以将 RTSP 通道设为 MF只发送 a=sendonly, UE只接收的模式 a=recvonly, 实现去激活； 或者将 RTSP控制通道关联的媒体流去关联， 如： a=r t s pid m_s tream: l中， 将 r t spid m-s tream后面关联的媒体流标签 1去掉；  In the fourth embodiment, a way to deactivate the RTSP channel is given. The RTSP channel can also be set to MF to send only a=sendonly, and the UE only receives the mode a=recvonly to implement deactivation; or the RTSP control channel Associate the associated media stream to associate, for example: a=rts pid m_s tream: l, remove the media stream label 1 associated with rt spid ms tream;
通过以上流程， 实现了 SCF通过与 MF之间进行 SDP协商， 禁止 UE对该 媒体流的控制操作， 然后再恢复 UE对媒体流的控制操作， 这样可以避免出现 Through the above process, the SCF performs SDP negotiation with the MF, prohibits the UE from controlling the media stream, and then resumes the UE's control operation on the media stream, so as to avoid
VCR操作冲突。 VCR operation conflicts.
实施例五： 通过 SIP消息来避免 VCR冲突  Embodiment 5: Avoiding VCR conflicts through SIP messages
本实施例的具体实现流程如图 8所示， 包括如下步骤：  The specific implementation process of this embodiment is shown in FIG. 8, and includes the following steps:
步骤 801 ~ 806: UE通过 SCF与 MF进行 S IP SDP交互，建立媒体流和 RTSP 控制通道， 该 RTSP控制通道称为通道 1。  Steps 801 ~ 806: The UE performs S IP SDP interaction with the MF through the SCF to establish a media stream and an RTSP control channel, and the RTSP control channel is referred to as channel 1.
步骤 807: SCF上触发业务， 需要禁止 UE的 VCR操作。  Step 807: The service is triggered on the SCF, and the VCR operation of the UE needs to be prohibited.
步骤 808: SCF向 MF发送会话内 INVITE消息， 携带 SDP offer , 通过 SDP 协商将 UE的 RTSP通道即通道 1设为去激活状态， 禁止 UE的 RTSP操作。  Step 808: The SCF sends an intra-session INVITE message to the MF, and carries the SDP offer. The STP negotiation is used to set the UE's RTSP channel, that is, the channel 1 to the deactivated state, and the RTSP operation of the UE is prohibited.
下面给出所述 INVITE消息的一个示例：  An example of the INVITE message is given below:
INVITE sip:MF.example.com SIP/2.0  INVITE sip: MF.example.com SIP/2.0
Via: ...  Via: ...
Route: ...  Route: ...
Max-Forwards: ...  Max-Forwards: ...
From: ...  From: ...
To: ...  To: ...
Call-ID: ...  Call-ID: ...
CSeq: ... v=0  CSeq: ... v=0
o=SCF 20000000 20000001 IN IP4 scf.example.com o=SCF 20000000 20000001 IN IP4 scf.example.com
s= s=
c=IN IP4 uehost.example.com c=IN IP4 uehost.example.com
t=0 0 t=0 0
m=video 30100 RTP/AVP 31 32 m=video 30100 RTP/AVP 31 32
a=rtpmap:31 H261/90000 a=label: l a=rtpmap:31 H261/90000 a=label: l
m=application 9 TCP/RTSP rtsp m=application 9 TCP/RTSP rtsp
a=fmtp:rtsp version: 2.0 a=fmtp:rtsp version: 2.0
a=rtspid m-stream: 1 a=rtspid m-stream: 1
a=inactive /* 将 UE的 RTSP通道设为去激活状态 */ a=inactive /* Set the UE's RTSP channel to deactivated */
步骤 809: MF返回 200 OK, 携带 SDP answer。  Step 809: MF returns 200 OK, carrying SDP answer.
下面给出所述 200 OK消息的一个示例：  An example of the 200 OK message is given below:
SIP/2.0 200 OK  SIP/2.0 200 OK
Via: ... Via: ...
Max-Forwards: ...  Max-Forwards: ...
From: ... From: ...
To: ... To: ...
Call-ID: ... Call-ID: ...
CSeq: ... v=0 CSeq: ... v=0
o=MF 30000000 30000000 IN IP4 MF.example.com o=MF 30000000 30000000 IN IP4 MF.example.com
s= s=
c=IN IP4 MF.example.com c=IN IP4 MF.example.com
t=0 0 t=0 0
m=video 50100 RTP/AVP 31 32 m=video 50100 RTP/AVP 31 32
a=rtpmap:31 H261/90000 a=rtpmap:31 H261/90000
a=label: l a=label: l
m=application 60010 TCP RTSP rtsp m=application 60010 TCP RTSP rtsp
a=fmtp:rtsp version: 2.0 a=fmtp:rtsp version: 2.0
a=rtspid m-stream: 1 a=rtspid m-stream: 1
a=inactive /* 将 UE的 RTSP通道设为去激活状态 */ a=inactive /* Set the UE's RTSP channel to deactivated */
步骤 810: SCF发送 ACK确认。  Step 810: The SCF sends an ACK confirmation.
步骤 811 : SCF结束对媒体流的控制， 向 MF发送会话内 INVITE消息， 携 带 SDP offer , 通过 SDP协商将 UE的 RTSP通道即通道 1设为激活状态。  Step 811: The SCF ends the control of the media stream, sends an intra-session INVITE message to the MF, carries the SDP offer, and sets the UE's RTSP channel, channel 1, to the active state through SDP negotiation.
下面给出所述 INVITE消息的一个示例：  An example of the INVITE message is given below:
INVITE sip:MF.example.com SIP/2.0  INVITE sip: MF.example.com SIP/2.0
Via: ... Via: ...
Route: ... Route: ...
Max-Forwards: ... Max-Forwards: ...
From: ... To: From: ... To:
Call-ID: ...  Call-ID: ...
CSeq: ... v=0 CSeq: ... v=0
o=SCF 20000000 20000002 IN IP4 scf.example.com o=SCF 20000000 20000002 IN IP4 scf.example.com
s= s=
c=IN IP4 uehost.example.com c=IN IP4 uehost.example.com
t=0 0 t=0 0
m= video 30100 RTP/AVP 31 32 m= video 30100 RTP/AVP 31 32
a=rtpmap:31 H261/90000 a=rtpmap:31 H261/90000
a=label: l a=label: l
m=application 9 TCP/RTSP rtsp m=application 9 TCP/RTSP rtsp
a=fmtp:rtsp version: 2.0 a=fmtp:rtsp version: 2.0
a=rtspid m-stream: 1 a=rtspid m-stream: 1
a=sendrecv /* 将 UE的 RTSP通道设为激活状态 */ 步骤 812: MF返回 200 OK, 携带 SDP answer。 a=sendrecv /* Set the UE's RTSP channel to active */ Step 812: MF returns 200 OK, carrying SDP answer.
下面给出所述 200 OK消息的一个示例：  An example of the 200 OK message is given below:
SIP/2.0 200 OK  SIP/2.0 200 OK
Via: ... Via: ...
Max- Forwards: ...  Max- Forwards: ...
From: ... From: ...
To: ... To: ...
Call-ID: ... Call-ID: ...
CSeq: ... v=0 CSeq: ... v=0
o=MF 30000000 30000000 IN IP4 MF.example.com o=MF 30000000 30000000 IN IP4 MF.example.com
s= s=
c=IN IP4 MF.example.com c=IN IP4 MF.example.com
t=0 0 t=0 0
m=video 50100 RTP/AVP 31 32 m=video 50100 RTP/AVP 31 32
a=rtpmap:31 H261/90000 a=rtpmap:31 H261/90000
a=label: l a=label: l
m=application 60010 TCP RTSP rtsp m=application 60010 TCP RTSP rtsp
a=fmtp:rtsp version: 2.0 a=fmtp:rtsp version: 2.0
a=rtspid m-stream: 1 a=rtspid m-stream: 1
a=sendrecv /* 将 UE的 RTSP通道设为激活状态 */ 步骤 813: SCF发送 ACK确认。 a=sendrecv /* Set the UE's RTSP channel to active*/ Step 813: The SCF sends an ACK acknowledgement.
实施例六： 通过媒体控制消息避免 VCR冲突  Embodiment 6: Avoiding VCR conflicts through media control messages
本实施例的具体实现流程如图 9所示， 包括如下步骤：  The specific implementation process of this embodiment is shown in FIG. 9, and includes the following steps:
步骤 901 ~ 906: UE通过 SCF与 MF进行 SIP SDP交互，建立媒体流和 RTSP 控制通道；  Steps 901 ~ 906: The UE performs SIP SDP interaction with the MF through the SCF to establish a media stream and an RTSP control channel.
步骤 907： SCF上触发业务， 需要禁止 UE的 VCR操作， SCF与 MF进行 SDP 协商， 禁止 UE的 VCR操作；  Step 907: The service is triggered on the SCF, and the VCR operation of the UE needs to be prohibited. The SCF and the MF perform SDP negotiation, and the VCR operation of the UE is prohibited.
步骤 908 ~ 910： 如果 SCF与 MF间没有可用的媒体控制通道， SCF向 MF 发送会话内 INVITE消息， 携带 SDP offer, 协商建立媒体控制通道；  Steps 908-910: If there is no media control channel available between the SCF and the MF, the SCF sends an intra-session INVITE message to the MF, carries the SDP offer, and negotiates to establish a media control channel.
步骤 911: SCF向 MF发送媒体控制消息 MRequest携带禁止 UE的 VCR操 作指示；  Step 911: The SCF sends a media control message to the MF. The MRequest carries a VCR operation indication that prohibits the UE;
步骤 912： MF返回响应消息 MRe sponse;  Step 912: MF returns a response message MRe sponse;
步骤 913： SCF通知 UE VCR操作被禁止；  Step 913: The SCF notifies the UE that the VCR operation is prohibited.
步骤 914: SCF向 MF发送媒体控制消息 MRequest携带允许 UE的 VCR操 作指示；  Step 914: The SCF sends a media control message to the MF. The MRequest carries a VCR operation indication that allows the UE.
步骤 915： MF返回响应消息 MRe sponse;  Step 915: MF returns a response message MRe sponse;
步骤 916： SCF通知 UE允许执行 VCR操作。  Step 916: The SCF notifies the UE to allow the VCR operation to be performed.
本发明实施例中的用于实现业务提供实体对媒体流控制的系统， 如图 11 所示， 至少包括：  The system for implementing the control of the media stream by the service providing entity in the embodiment of the present invention, as shown in FIG. 11, includes at least:
媒体资源服务器 1110, 用于与用户设备建立媒体流；  a media resource server 1110, configured to establish a media stream with the user equipment;
业务提供实体 1120, 用于向所述媒体资源服务器发送对所述媒体流的控 制命令；  a service providing entity 1120, configured to send, to the media resource server, a control command for the media stream;
则所述媒体资源服务器根据所述业务提供实体的控制命令， 对媒体流进 行控制操作。  And the media resource server controls the media stream according to the control command of the service providing entity.
根据以上实施例方案， 业务提供实体与媒体资源服务器之间的交互关系 分为如下三类：  According to the solution of the above embodiment, the interaction relationship between the service providing entity and the media resource server is classified into the following three categories:
第一类参照本发明第一实施例的方案， 通过业务提供实体和媒体资源服 务器之间进行 SDP协议协商， 业务提供实体和媒体资源服务器之间建立 RTSP 控制通道； 业务提供实体通过所述业务提供实体与媒体资源服务器之间的 RTSP控制通道， 向媒体资源服务器发起对媒体流的控制操作。 在完成控制操 出于通道重用的考虑， 不拆除该 RTSP控制通道。 The first type refers to the solution of the first embodiment of the present invention, through the service providing entity and the media resource service The SDP protocol negotiation is performed between the server, and the RTSP control channel is established between the service providing entity and the media resource server. The service providing entity initiates the media to the media resource server by using an RTSP control channel between the service providing entity and the media resource server. Flow control operation. The RTSP control channel is not removed when the control operation is completed for channel reuse.
第二类参照本发明第二实施例方案， 业务提供实体向媒体资源服务器发 送携带媒体控制命令的 S IP消息； 媒体资源服务器根据所述 S IP消息中携带 的媒体控制命令， 进行媒体流控制操作。 这种交互关系不需要建立二者之间 的控制通道。  The second type refers to the solution of the second embodiment of the present invention, the service providing entity sends an IP message carrying the media control command to the media resource server, and the media resource server performs the media stream control operation according to the media control command carried in the S IP message. . This interaction does not require a control channel between the two.
第三类参照本发明第三实施例方案， 所述业务提供实体用于与媒体资源 服务器建立媒体控制通道， 并通过所述业务提供实体与媒体资源服务器之间 的媒体控制通道， 向媒体资源服务器发起对媒体流的控制操作。  The third type refers to the solution of the third embodiment of the present invention, where the service providing entity is configured to establish a media control channel with the media resource server, and provide a media control channel between the service providing entity and the media resource server to the media resource server. Initiate control of the media stream.
无论上述三类中的那一类， 如果媒体资源服务器与用户设备之间已经建 立了 RTSP控制通道， 则所述业务提供实体还要向媒体资源服务器发送禁止指 示， 所述禁止指示用于禁止所述用户设备与媒体资源服务器之间的 RTSP控制 通道；  Regardless of the above three categories, if an RTSP control channel has been established between the media resource server and the user equipment, the service providing entity further sends a prohibition indication to the media resource server, and the prohibition indication is used to prohibit the An RTSP control channel between the user equipment and the media resource server;
所述媒体资源服务器根据来自业务提供实体的禁止指示， 禁止自身与用 户设备的 RTSP控制通道。  The media resource server prohibits the RTSP control channel of itself and the user equipment according to the prohibition indication from the service providing entity.
在业务提供实体完成对媒体流的控制之后， 业务提供实体进一步用于向 媒体资源服务器发送允许指示， 所述允许指示用于允许所述用户设备与媒体 资源服务器之间已被禁止的 RTSP控制通道。  After the service providing entity completes control of the media stream, the service providing entity is further configured to send an permission indication to the media resource server, where the permission indication is used to allow the RTSP control channel that is prohibited between the user equipment and the media resource server .
所述业务提供实体为 SCF , 媒体资源服务器为 MF;  The service providing entity is an SCF, and the media resource server is an MF;
或者， 所述业务提供实体为 AS , 媒体资源服务器为 MRF。  Alternatively, the service providing entity is an AS, and the media resource server is an MRF.
本发明实施例的业务提供实体的结构如图 10所示， 包括：  The structure of the service providing entity in the embodiment of the present invention is as shown in FIG. 10, and includes:
媒体流控制模块 1010 ,用于向媒体资源服务器发起对媒体流的控制操作。 所述媒体流控制模块 1010包括：  The media stream control module 1010 is configured to initiate a control operation on the media stream to the media resource server. The media flow control module 1010 includes:
避免冲突单元 101 1 , 用于向媒体资源服务器发送禁止指示， 所述禁止指 示用于禁止用户设备与媒体资源服务器之间的 RTSP控制通道。 所述禁止指示 可以是会话内 INVITE消息， 携带 SDP offer , 将用户设备的的 RTSP控制通道 设为去激活状态。 所述设为去激活， 可以是将 RTSP控制通道设为禁用， 还可 以将 RTSP控制通道设为媒体资源服务器只发送 a=sendonly,用户设备只接收 的模式 a=recvonly,实现去激活；或者将 RTSP控制通道关联的媒体流去关联。 The conflict avoiding unit 101 1 is configured to send a prohibition indication to the media resource server, where the prohibition refers to Indicated to disable the RTSP control channel between the user equipment and the media resource server. The prohibition indication may be an intra-session INVITE message carrying an SDP offer, and setting the RTSP control channel of the user equipment to an deactivated state. The setting is deactivated, the RTSP control channel may be disabled, and the RTSP control channel may be set to the media resource server to send only a=sendonly, and the user equipment only receives the mode a=recvonly to implement deactivation; or The media stream associated with the RTSP control channel is de-associated.
避免冲突单元 1011还用于向媒体资源服务器发送允许指示， 所述允许指 示用于允许所述用户设备与媒体资源服务器之间已被禁止的 RTSP控制通道。 允许指示可以为会话内 INVITE消息， 携带 SDP offer , 将用户设备的 RTSP通 道设为激活状态。  The collision avoidance unit 1011 is further configured to send an indication of permission to the media resource server, the permission indication for allowing the RTSP control channel between the user equipment and the media resource server to be disabled. The allowable indication may be an intra-session INVITE message carrying an SDP offer to set the RTSP channel of the user equipment to an active state.
所述媒体流控制模块 1010还包括如下任一组单元：  The media flow control module 1010 further includes any one of the following units:
第一组： RTSP控制通道单元 1012和发送单元 1013 , RTSP控制通道单元 1012用于与媒体资源服务器进行交互， 建立业务提供实体与媒体资源服务器 之间的 RTSP控制通道。  The first group: the RTSP control channel unit 1012 and the sending unit 1013, the RTSP control channel unit 1012 is configured to interact with the media resource server to establish an RTSP control channel between the service providing entity and the media resource server.
所述交互过程为： RTSP控制通道单元 1012向媒体资源服务器发送会话内 INVITE 消息， 携带 SDP offer , 新建一个业务提供实体与媒体资源服务器之 间的 RTSP控制通道， 媒体资源服务器收到该 INVITE消息后， 向 RTSP控制通 道单元 1012返回一个 200 0K消息， 携带 SDP应答； RTSP控制通道单元 1012 再向媒体资源服务器发送 ACK确认。  The interaction process is: the RTSP control channel unit 1012 sends an intra-session INVITE message to the media resource server, carries the SDP offer, creates an RTSP control channel between the service providing entity and the media resource server, and the media resource server receives the INVITE message. Returning a 200 OK message to the RTSP control channel unit 1012, carrying an SDP response; the RTSP control channel unit 1012 sends an ACK acknowledgement to the media resource server.
发送单元 1013用于通过所述业务提供实体与媒体资源服务器之间的 RTSP 控制通道， 向媒体资源服务器发送媒体流控制命令。  The sending unit 1013 is configured to send a media flow control command to the media resource server by using an RTSP control channel between the service providing entity and the media resource server.
第二组： S IP 消息发送单元 1014 , 用于向媒体资源服务器发送携带媒体 控制命令的 S IP消息。 所述携带媒体控制命令的 SIP消息可以是 INFO消息， 媒体资源服务器收到 INF0消息后， 执行相应的媒体流控制操作。  The second group: the S IP message sending unit 1014 is configured to send an S IP message carrying the media control command to the media resource server. The SIP message carrying the media control command may be an INFO message, and after receiving the INF0 message, the media resource server performs a corresponding media stream control operation.
第三组： 媒体控制通道单元 1015 , 用于与媒体资源服务器进行交互， 建 立业务提供实体与媒体资源服务器之间的媒体控制通道； 所述交互过程可以 包括：  The third group: the media control channel unit 1015, configured to interact with the media resource server, and establish a media control channel between the service providing entity and the media resource server; the interaction process may include:
媒体控制通道单元 1015向媒体资源服务器发送会话内 INVITE消息， 携 带 SDP offer; 媒体资源服务器返回 200 OK, 携带 SDP answer; 媒体控制通 道单元 1015再向媒体资源服务器发送 ACK确认。 The media control channel unit 1015 sends an intra-session INVITE message to the media resource server. With the SDP offer; the media resource server returns 200 OK, carrying the SDP answer; the media control channel unit 1015 sends an ACK confirmation to the media resource server.
发送单元 1016, 用于通过所述业务提供实体与媒体资源服务器之间的媒 体控制通道， 向媒体资源服务器发送媒体流控制命令。 所述媒体流控制命令 携带在媒体控制消息 (MRequest ) 中。  The sending unit 1016 is configured to send a media flow control command to the media resource server by using a media control channel between the service providing entity and the media resource server. The media flow control command is carried in a media control message (MRequest).
本发明解决了在某些业务场景下业务提供实体需要控制指定媒体流进行 后退、 快进、 暂停、 定位的操作。  The invention solves the operation that the service providing entity needs to control the specified media stream to perform back, fast forward, pause, and locate in certain service scenarios.
以上所述仅为本发明的较佳实施例而已， 并不用以限制本发明， 凡在本 发明的精神和原则之内所作的任何修改、 等同替换和改进等， 均应包含在本 发明的保护范围之内。  The above is only the preferred embodiment of the present invention, and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection of the present invention. Within the scope.

Claims

权 利 要求 书 Claim
1、 一种业务提供实体对媒体流控制的方法， 其特征在于， 用户设备与媒体 资源服务器之间存在媒体流连接， 包括如下步骤：  A method for controlling a media stream by a service providing entity, wherein a media stream connection exists between the user equipment and the media resource server, including the following steps:
业务提供实体发起对媒体流的控制操作；  The service providing entity initiates a control operation on the media stream;
所述对媒体流的控制操作由媒体资源服务器执行。  The control operation on the media stream is performed by a media resource server.
1、 根据权利要求 1所述的方法， 其特征在于， 所述业务提供实体发起对媒 体流的控制操作之前， 进一步包括：  The method according to claim 1, wherein before the service providing entity initiates a control operation on the media stream, the method further includes:
建立业务提供实体与媒体资源服务器之间的实时流协议 RTSP控制通道； 所述业务提供实体发起对媒体流的控制操作为： 业务提供实体通过所述 RTSP控制通道， 向媒体资源服务器发起对媒体流的控制操作。  Establishing a real-time streaming protocol RTSP control channel between the service providing entity and the media resource server; the service providing entity initiates a control operation on the media stream: the service providing entity initiates the media stream to the media resource server by using the RTSP control channel Control operation.
3、 根据权利要求 2所述的方法， 其特征在于， 所述建立业务提供实体与媒 体资源服务器之间的 RTSP控制通道包括：  The method according to claim 2, wherein the establishing an RTSP control channel between the service providing entity and the media resource server comprises:
所述业务提供实体发出的会话内邀请消息， 所述邀请消息携带新建一个业 务提供实体与媒体资源服务器的 RTSP控制通道的指示；  An in-session invitation message sent by the service providing entity, where the invitation message carries an indication of a new service providing entity and an RTSP control channel of the media resource server;
媒体资源服务器向业务提供实体返回会话响应消息， 携带媒体描述应答信 息；  The media resource server returns a session response message to the service providing entity, and carries the media description response information;
业务提供实体向媒体资源服务器发送确认消息， 业务提供实体与媒体资源 服务器之间建立 RTSP控制通道。  The service providing entity sends an acknowledgement message to the media resource server, and an RTSP control channel is established between the service providing entity and the media resource server.
4、 根据权利要求 1所述的方法， 其特征在于， 所述业务提供实体发起对媒 体流的控制操作包括：  The method according to claim 1, wherein the operation of the service providing entity to initiate the control of the media stream comprises:
业务提供实体向媒体资源服务器发送携带媒体控制命令的会话初始协议 S IP消息。  The service providing entity sends a Session Initiation Protocol S IP message carrying the media control command to the media resource server.
5、 根据权利要求 1所述的方法， 其特征在于， 所述业务提供实体发起对媒 体流的控制操作之前， 进一步包括：  The method according to claim 1, wherein before the service providing entity initiates a control operation on the media stream, the method further includes:
业务提供实体与媒体资源服务器间建立媒体控制通道；  Establishing a media control channel between the service providing entity and the media resource server;
所述业务提供实体发起对媒体流的控制操作为： 业务提供实体通过所述媒 体控制通道， 向媒体资源服务器发送携带媒体流控制指示的媒体控制消息。 The service providing entity initiates a control operation on the media stream: the service providing entity sends a media control message carrying the media flow control indication to the media resource server by using the media control channel.
6、 一种业务提供实体对媒体流控制的方法， 其特征在于， 用户设备与媒体 资源服务器之间存在媒体流连接以及 RTSP控制通道， 包括如下步骤： A method for controlling a media stream by a service providing entity, wherein a media stream connection and an RTSP control channel exist between the user equipment and the media resource server, including the following steps:
业务提供实体控制媒体资源服务器执行禁止用户设备的媒体流控制操作； 业务提供实体发起对媒体流的控制操作；  The service providing entity controls the media resource server to perform a media stream control operation for prohibiting the user equipment; the service providing entity initiates a control operation on the media stream;
业务提供实体控制媒体资源服务器执行恢复用户设备的媒体流控制操作。 The service providing entity controls the media resource server to perform media stream control operations for restoring the user equipment.
7、 根据权利要求 6所述的方法， 其特征在于， 所述业务提供实体控制媒体 资源服务器 , 禁止用户设备的媒体流控制操作包括： The method according to claim 6, wherein the service providing entity controls the media resource server, and the media stream control operation of the user equipment is prohibited:
业务提供实体向媒体资源服务器发送会话内邀请消息， 所述邀请消息将所 述用户设备的 RTSP控制通道设为去激活状态；  The service providing entity sends an intra-session invitation message to the media resource server, where the invitation message sets the RTSP control channel of the user equipment to a deactivated state;
所述媒体资源服务器根据所述邀请消息， 将所述用户设备的 RTSP控制通道 设为去激活状态。  The media resource server sets the RTSP control channel of the user equipment to a deactivated state according to the invitation message.
8、 根据权利要求 7所述的方法， 其特征在于， 所述业务提供实体控制媒体 资源服务器 , 恢复用户设备的媒体流控制操作包括：  The method according to claim 7, wherein the service providing entity controls the media resource server, and the media stream control operation of restoring the user equipment includes:
业务提供实体向媒体资源服务器发送会话内邀请消息， 所述邀请消息将所 述用户设备的 RTSP控制通道设为激活状态；  The service providing entity sends an intra-session invitation message to the media resource server, where the invitation message sets the RTSP control channel of the user equipment to an active state;
所述媒体资源服务器根据所述邀请消息， 将所述用户设备的 RTSP控制通道 设为激活状态。  The media resource server sets the RTSP control channel of the user equipment to an active state according to the invitation message.
9、 根据权利要求 6所述的方法， 其特征在于， 所述业务提供实体发起对媒 体流的控制操作之后， 进一步包括： 媒体资源服务器执行所述对媒体流的控制 操作。  The method according to claim 6, wherein after the service providing entity initiates a control operation on the media stream, the method further includes: the media resource server performing the control operation on the media stream.
1 0、 根据权利要求 7、 8或 9任一项所述的方法， 其特征在于， 所述的激活 状态是允许 RTSP控制通道传递控制消息； 所述的去激活状态是禁止 RTSP控制 通道传递控制消息。  The method according to any one of claims 7, 8 or 9, wherein the activation state is to allow the RTSP control channel to transmit a control message; the deactivation state is to prohibit the RTSP control channel from transmitting control Message.
1 1、 一种业务提供实体对媒体流控制的系统， 其特征在于， 包括： 媒体资源服务器 （1 1 1 0 ), 用于与用户设备建立媒体流；  A system for controlling a media stream by a service providing entity, comprising: a media resource server (1 1 1 0 ), configured to establish a media stream with a user equipment;
业务提供实体（1 120 ), 用于向所述媒体资源服务器发送对所述媒体流的控 制命令； 所述媒体资源服务器 （1110 )还用于根据所述业务提供实体的控制命令， 对媒体流进行控制操作。 a service providing entity (1 120), configured to send, to the media resource server, a control command for the media stream; The media resource server (1110) is further configured to perform a control operation on the media stream according to a control command of the service providing entity.
12、 根据权利要求 11所述的系统， 其特征在于， 所述媒体资源服务器还用 于与用户设备建立 RTSP控制通道； 则  The system according to claim 11, wherein the media resource server is further configured to establish an RTSP control channel with the user equipment;
所述业务提供实体， 还用于向媒体资源服务器发送禁止指示， 所述禁止指 示用于禁止所述用户设备与媒体资源服务器之间的 RTSP控制通道；  The service providing entity is further configured to send a prohibition indication to the media resource server, where the prohibition indication is used to prohibit an RTSP control channel between the user equipment and the media resource server;
所述媒体资源服务器， 还用于根据来自业务提供实体的禁止指示， 禁止自 身与用户设备的 RTSP控制通道。  The media resource server is further configured to prohibit the RTSP control channel of the user device and the user device according to the prohibition indication from the service providing entity.
1 3、 根据权利要求 12所述的系统， 其特征在于， 所述业务提供实体进一步 用于向媒体资源服务器发送允许指示， 所述允许指示用于允许所述用户设备与 媒体资源服务器之间已被禁止的 RTSP控制通道。  The system according to claim 12, wherein the service providing entity is further configured to send an permission indication to the media resource server, where the permission indication is used to allow the user equipment and the media resource server to be Prohibited RTSP control channel.
14、 根据权利要求 11至 1 3任一项所述的系统， 其特征在于，  14. A system according to any one of claims 11 to 13 wherein:
所述业务提供实体， 还用于和媒体资源服务器建立 RTSP控制通道， 并通过 所述业务提供实体与媒体资源服务器之间的 RTSP控制通道， 向媒体资源服务器 发起对媒体流的控制操作。  The service providing entity is further configured to establish an RTSP control channel with the media resource server, and initiate a control operation on the media stream to the media resource server by using an RTSP control channel between the service providing entity and the media resource server.
15、 根据权利要求 11至 1 3任一项所述的系统， 其特征在于，  15. A system according to any one of claims 11 to 13 wherein:
所述业务提供实体，还用于向媒体资源服务器发送携带媒体控制命令的 S IP 消息；  The service providing entity is further configured to send, to the media resource server, an S IP message that carries a media control command;
所述媒体资源服务器， 还用于根据所述 S IP 消息中携带的媒体控制命令， 进行媒体流控制操作。  The media resource server is further configured to perform a media stream control operation according to the media control command carried in the S IP message.
16、 根据权利要求 11至 1 3任一项所述的系统， 其特征在于，  16. A system according to any one of claims 11 to 13 wherein:
所述业务提供实体， 还用于与媒体资源服务器建立媒体控制通道， 并通过 所述业务提供实体与媒体资源服务器之间的媒体控制通道， 向媒体资源服务器 发起对媒体流的控制操作。  The service providing entity is further configured to establish a media control channel with the media resource server, and initiate a control operation on the media stream to the media resource server by using a media control channel between the service providing entity and the media resource server.
17、 根据权利要求 11至 1 3任一项所述的系统， 其特征在于，  17. A system according to any one of claims 11 to 13 wherein:
所述业务提供实体为业务控制功能实体 SCF ,媒体资源服务器为媒体功能实 体 MF; 或者， 所述业务提供实体为应用服务器 AS, 媒体资源服务器为媒体资源功能实体The service providing entity is a service control function entity SCF, and the media resource server is a media function entity MF; or The service providing entity is an application server AS, and the media resource server is a media resource functional entity.
MRF。 MRF.
18、 一种业务提供实体， 其特征在于， 包括：  18. A service providing entity, comprising:
媒体流控制模块（ 1010 ),用于向媒体资源服务器发起对媒体流的控制操作。 The media stream control module (1010) is configured to initiate a control operation on the media stream to the media resource server.
19、 根据权利要求 18所述的业务提供实体， 其特征在于， 所述媒体流控制 模块（1010)进一步包括： The service providing entity according to claim 18, wherein the media flow control module (1010) further comprises:
避免冲突单元（1011 ), 用于向媒体资源服务器发送禁止指示， 所述禁止指 示用于禁止用户设备与媒体资源服务器之间的 RTSP控制通道； 还用于向媒体资 源服务器发送允许指示， 所述允许指示用于允许所述用户设备与媒体资源服务 器之间已被禁止的 RTSP控制通道。  a collision avoidance unit (1011), configured to send a prohibition indication to the media resource server, where the prohibition indication is used to prohibit an RTSP control channel between the user equipment and the media resource server, and is further configured to send an permission indication to the media resource server, where An indication is given to allow an RTSP control channel that has been disabled between the user equipment and the media resource server.
20、 根据权利要求 18或 19所述的业务提供实体， 其特征在于， 所述媒体 流控制模块（1010)进一步包括：  The service providing entity according to claim 18 or 19, wherein the media stream control module (1010) further comprises:
RTSP控制通道单元（1012), 用于与媒体资源服务器进行交互， 建立业务提 供实体与媒体资源服务器之间的 RTSP控制通道；  The RTSP control channel unit (1012) is configured to interact with the media resource server to establish an RTSP control channel between the service providing entity and the media resource server;
发送单元 （1013 ), 用于通过所述业务提供实体与媒体资源服务器之间的 RTSP控制通道， 向媒体资源服务器发送媒体流控制命令。  The sending unit (1013) is configured to send a media flow control command to the media resource server by using an RTSP control channel between the service providing entity and the media resource server.
21、 根据权利要求 18或 19所述的业务提供实体， 其特征在于， 所述媒体 流控制模块（1010)进一步包括：  The service providing entity according to claim 18 or 19, wherein the media stream control module (1010) further comprises:
SIP 消息发送单元（1014), 用于向媒体资源服务器发送携带媒体控制命令 的 SIP消息。  The SIP message sending unit (1014) is configured to send a SIP message carrying the media control command to the media resource server.
22、 根据权利要求 18或 19所述的业务提供实体， 其特征在于， 所述媒体 流控制模块（1010)进一步包括：  The service providing entity according to claim 18 or 19, wherein the media stream control module (1010) further comprises:
媒体控制通道单元（1015), 用于与媒体资源服务器进行交互， 建立业务提 供实体与媒体资源服务器之间的媒体控制通道；  The media control channel unit (1015) is configured to interact with the media resource server to establish a media control channel between the service providing entity and the media resource server;
发送单元 ( 1016 ), 用于通过所述业务提供实体与媒体资源服务器之间的媒 体控制通道， 向媒体资源服务器发送媒体流控制命令。  The sending unit (1016) is configured to send a media flow control command to the media resource server by using a media control channel between the service providing entity and the media resource server.
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