WO2008110094A1 - Procédé et système permettant d'obtenir une commutation de service de télévision par protocole internet (iptv) - Google Patents

Procédé et système permettant d'obtenir une commutation de service de télévision par protocole internet (iptv) Download PDF

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Publication number
WO2008110094A1
WO2008110094A1 PCT/CN2008/070422 CN2008070422W WO2008110094A1 WO 2008110094 A1 WO2008110094 A1 WO 2008110094A1 CN 2008070422 W CN2008070422 W CN 2008070422W WO 2008110094 A1 WO2008110094 A1 WO 2008110094A1
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WO
WIPO (PCT)
Prior art keywords
media
entity
handover
function entity
service
Prior art date
Application number
PCT/CN2008/070422
Other languages
English (en)
Chinese (zh)
Inventor
Feng Wang
Zhaojun Peng
Jun Yan
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 WO2008110094A1 publication Critical patent/WO2008110094A1/fr

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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
    • H04N7/17318—Direct or substantially direct transmission and handling of requests
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L65/00—Network arrangements, protocols or services for supporting real-time applications in data packet communication
    • H04L65/60—Network streaming of media packets
    • H04L65/61—Network streaming of media packets for supporting one-way streaming services, e.g. Internet radio
    • H04L65/612—Network streaming of media packets for supporting one-way streaming services, e.g. Internet radio for unicast
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L65/00—Network arrangements, protocols or services for supporting real-time applications in data packet communication
    • H04L65/60—Network streaming of media packets
    • H04L65/61—Network streaming of media packets for supporting one-way streaming services, e.g. Internet radio
    • H04L65/613—Network streaming of media packets for supporting one-way streaming services, e.g. Internet radio for the control of the source by the destination
    • 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]
    • H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
    • H04N21/43—Processing of content or additional data, e.g. demultiplexing additional data from a digital video stream; Elementary client operations, e.g. monitoring of home network or synchronising decoder's clock; Client middleware
    • H04N21/438—Interfacing the downstream path of the transmission network originating from a server, e.g. retrieving encoded video stream packets from an IP network
    • H04N21/4383—Accessing a communication channel
    • H04N21/4384—Accessing a communication channel involving operations to reduce the access time, e.g. fast-tuning for reducing channel switching latency
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
    • H04N21/60—Network structure or processes for video distribution between server and client or between remote clients; Control signalling between clients, server and network components; Transmission of management data between server and client, e.g. sending from server to client commands for recording incoming content stream; Communication details between server and client 
    • H04N21/61—Network physical structure; Signal processing
    • H04N21/6106—Network physical structure; Signal processing specially adapted to the downstream path of the transmission network
    • H04N21/6125—Network physical structure; Signal processing specially adapted to the downstream path of the transmission network involving transmission via Internet
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
    • H04N21/60—Network structure or processes for video distribution between server and client or between remote clients; Control signalling between clients, server and network components; Transmission of management data between server and client, e.g. sending from server to client commands for recording incoming content stream; Communication details between server and client 
    • H04N21/61—Network physical structure; Signal processing
    • H04N21/6156—Network physical structure; Signal processing specially adapted to the upstream path of the transmission network
    • H04N21/6175—Network physical structure; Signal processing specially adapted to the upstream path of the transmission network involving transmission via Internet

Definitions

  • the present invention relates to the field of network television technologies, and more particularly to a method and system for implementing network television service switching, and a device for implementing a media anchoring function and a device for implementing a switching control function.
  • IPTV Internet TV
  • IPTV Internet TV
  • broadband networks Compared with the traditional TV service, IPTV provides a more flexible and flexible service and an integrated network TV value-added service platform, including communication, data, video, audio and other business content.
  • the Internet TV service is mainly divided into: Live TV (LTV, Linear TV) service and Video on Demand (VOD, Video on demand) business.
  • V0D programs are transmitted in unicast mode.
  • LTV programs are transmitted in multicast mode.
  • FIG. 1 is a schematic structural diagram of a network television system in the prior art.
  • the existing network television system generally includes: a content source, a user equipment UE, a session control function entity, a network television application server, an IPTV AS, and some other network entities that interact with the IPTV AS.
  • the content source is used to provide the IPTV service content to the UE;
  • the UE is the device that the user receives the IPTV service;
  • the session control function entity is used for the session control, management, and routing;
  • the IPTV AS is the application server that processes the IPTV service request logic.
  • the IPTV service switching refers to the switching characteristics between different access technologies supporting IPTV services and across different access technologies.
  • the essence of the IPTV service is the change of the media channel caused by the change of the access link. It is divided into user side switching and content source side switching. In the process of switching the network television service, it is necessary to maintain the ongoing session control and the continuous uninterrupted user plane media stream, that is, to ensure the continuity of the IPTV service.
  • the embodiment of the present invention further provides a handover method, which implements a network.
  • the switching of the TV service ensures the continuity of the network TV service during the handover process.
  • the embodiment of the invention further provides a device for implementing a handover control function, which implements handover of a network television service and ensures continuity of the network television service in the handover process.
  • the embodiment of the invention also provides a method for media anchoring, which ensures the continuity of the network television service in the handover process.
  • Embodiments of the present invention also provide an apparatus for implementing a media anchoring function, which ensures continuity of a network television service during handover.
  • the embodiment of the invention further provides a system for implementing network television service switching, which implements switching of network television services and ensures continuity of network television services in the handover process.
  • the embodiment of the invention further provides a method for implementing network television service switching, which implements the switching of the network television service and ensures the continuity of the network television service in the handover process.
  • a method of switching comprising:
  • a device for implementing a switching function comprising:
  • a handover control module configured to receive a service handover request sent by the handover initiation entity, and send handover control information to the UE and/or the streaming media content delivery entity, where the handover control information controls the streaming media content delivery entity or the user equipment to establish and switch Accept the media connection between the entities and then disconnect the media connection with the switch originating entity.
  • a method of media anchoring comprising:
  • the media anchoring function entity After receiving the handover control information, the media anchoring function entity establishes a media connection with the handover accepting entity;
  • the media anchoring function entity disconnects the media connection with the switching originating entity.
  • a device for implementing a media anchoring function comprising: The media stream transceiver module is configured to receive the media stream sent by the content source, and forward the media stream to the UE; and the command receiving module is configured to receive the switch control information when the network television service is switched, and control the media stream transceiver module to first establish and The switch accepts the media connection between the entities, and then cuts off the media connection between the media stream transceiver module and the handover originating entity.
  • a system for implementing network television service switching includes:
  • a media anchoring function entity configured to forward the media stream of the content source to the UE, and after receiving the handover control information, first establish a media connection with the handover accepting entity, and then cut off the media connection with the handover initiation entity .
  • a system for implementing network television service switching characterized in that:
  • a handover control function entity configured to: after receiving the handover request, send handover control information; the handover control information controls a streaming media content delivery entity or user equipment, first establishes a media connection with the handover accepting entity, and then disconnects and switches the initiation entity Media connection between.
  • a method for implementing network television service switching includes:
  • the handover control function entity sends the media control information to the media anchor function entity, and the media anchor function entity receives the media stream sent by the content source and forwards the message to the UE under the control of the media control information;
  • the handover control function entity sends handover control information to the media anchor function entity, and the media anchor function entity simultaneously sends the media stream to the handover initiation entity and the handover accepting entity under the control of the handover control information, or simultaneously switches from The media stream selected by the sending entity and the receiving entity selects to forward to the UE, and then cuts off the media connection with the handover initiating entity.
  • the embodiment of the present invention introduces a handover control function entity and/or a media anchor function entity in the network television system, and controls, first establishes a media connection of the handover acceptance entity, and then cuts off the media of the handover initiation entity.
  • the connection scheme realizes the switching of the network television service from the handover initiation entity to the handover acceptance entity, and ensures the continuity of the network television service in the handover process.
  • DRAWINGS 1 is a schematic structural diagram of a network television system in the prior art
  • FIG. 2 is a schematic diagram of a method for implementing network television service switching according to an embodiment of the present invention
  • FIG. 3 is a schematic diagram of a method for implementing network television service switching according to another embodiment of the present invention
  • FIG. 4 is a schematic diagram of implementing network television according to an embodiment of the present invention
  • FIG. 5 is a flow chart of a process of establishing a service connection on the user side of the system shown in FIG. 4;
  • FIG. 6 is a flow chart of a process of performing user-side service switching in the system shown in FIG. 4;
  • FIG. 7 is a flow chart of a process of establishing a service connection on the content source side of the system shown in FIG. 4;
  • FIG. 8 is a flowchart of a process of performing content source side service switching by the system shown in FIG.
  • FIG. 9 is a flowchart of a process for establishing an LTV service connection on the user side of the IMS system according to the embodiment of the present invention
  • FIG. 10 is a process flow diagram of the LTV service switching from UE1 to UE2 in the IMS system according to the embodiment of the present invention
  • FIG. 11 is a flowchart of a process for establishing an industry VOD service connection on the user side of the IMS system according to the embodiment of the present invention
  • FIG. 12 is a process flow diagram of the VOD service switching from UE1 to UE2 in the IMS system according to the embodiment of the present invention
  • FIG. 13 is a process flow diagram of establishing an LTV service connection on an content source side of an IMS system according to an embodiment of the present invention
  • FIG. 14 is a flow chart showing a process of switching an LTV service from a content source 1 to a content source 2 in an IMS system according to an embodiment of the present invention
  • FIG. 15 is a process flow diagram of establishing an V0D service connection on an content source side of an IMS system according to an embodiment of the present invention.
  • 16 is a flowchart of a process for switching a V0D service from a content source 1 to a content source 2 in an IMS system according to an embodiment of the present invention
  • FIG. 17 is a structural block diagram of an apparatus for implementing a handover control function according to an embodiment of the present invention
  • FIG. 18 is a structural block diagram of an apparatus for implementing a media anchoring function according to an embodiment of the present invention.
  • a switching control function entity is introduced in the network television system, and is intended to replace ⁇
  • the AS takes over the delivery control of the streaming media content, that is, the switching of the network television service is completed without the participation of the IPTV AS, including the switching on the user side and the switching on the content source side.
  • the network television service is handed over from the handover initiation entity to the handover accepting entity.
  • the UE1 is a handover initiation entity
  • the UE2 is a handover acceptance entity
  • content source 1 is a handover originating entity
  • content source 2 is a handover accepting entity.
  • FIG. 2 is a schematic diagram of a method for implementing network television service switching according to an embodiment of the present invention. As shown in FIG. 2, the method introduces a handover control function entity in an existing network television system.
  • the streaming media content delivery entity includes a content source and an entity that the media stream may pass before reaching the UE, a media anchoring functional entity as will be mentioned below, and the content source may be a UE or a media server that provides media content to the user.
  • the handover control function entity In the initial service establishment process, after the handover control function entity obtains the service establishment information, it takes over the function of the media control, that is, the control information sent by the IPTV AS to the UE and the streaming media content delivery entity is received by the handover control function entity, and is processed. Then send it to the UE and the streaming content delivery entity.
  • the handover control function entity receives the handover request, sends the handover control information to the streaming media content delivery entity and/or the UE, and controls the streaming media content delivery entity and the UE to complete the network television service from the handover initiation entity to the handover acceptance entity. Switch.
  • the specific handover is: first establishing a media connection between the streaming media content delivery entity and/or the UE and the handover accepting entity, and then cutting off the media connection of the streaming media content delivery entity and/or the UE and the handover initiation entity.
  • the streaming media content delivery entity is a media server or media anchoring function entity
  • the media receiver UE if the media receiver UE is to be handed over from UE1 to UE2, the streaming media content delivery entity simultaneously sends the media stream to UE1 and UE2, and then cuts off
  • the media connection of the UE1 is such that the content is only sent to the UE2; if the content source UE is to be switched from the content source UE1 to the content source UE2, the streaming media content delivery entity simultaneously receives the media streams of the content source UE1 and the content source UE2, and only forwards the content source.
  • the media of the UE1 is sent to the media receiver terminal, and then the reception with the content source UE1 is cut off, and the media of the content source
  • the control information is still intercepted by the handover control function entity, and the media control of the streaming media content delivery entity and the UE is completed by the handover control function entity.
  • each IPTV AS is required to support the handover function, and the related service switching process is completed when the network television service switching on the user side or the content source side is performed. But this mode of work is inefficient.
  • the handover request is sent to the handover control function entity, and the handover control function entity controls the entire service handover process, and the service switching process is shielded from the IPTV AS, thereby improving work efficiency.
  • a network anchoring function entity is configured to receive a media stream sent by a content source, and forward the media stream to the UE; and the media anchoring function entity receives the switching control information. Under the control, first establish a media connection with the handover accepting entity, and then cut off the media connection with the handover originating entity.
  • FIG. 3 is a schematic diagram of a method for implementing network television service switching according to still another embodiment of the present invention. As shown in FIG. 3, the method introduces a media anchoring functional entity in an existing network television system.
  • the media anchoring function entity inserts itself into the content source and the UE under the control of the control instruction, so that the media stream originally transmitted between the content source and the UE is changed to be anchored through the media.
  • the functional entity forwards, that is, the media anchoring function entity receives the media stream from the content source and forwards it to the UE.
  • the control commands can come from the IPTV AS or from the switching control function entity, provided that the handover control function entity has been introduced in the network television system.
  • the service establishment process may involve the media anchoring function entity to perform unicast-multicast, unicast-unicast, multicast-multicast, multicast-unicast conversion on the media stream from the content source to the UE.
  • the media anchor function entity When the media stream propagation mode of the content source to media anchor function entity is multicast, the media anchor function entity has a multicast joining capability, so that the media group can be added to the multicast group of the content source.
  • the media anchoring function entity also has a media control request proxy function, such as receiving an RTSP request sent by the UE and forwarding it to the content source.
  • the media anchor function entity keeps the media connection with the UE unchanged under the control of the control command, and only changes the media flow direction with the content source;
  • the media anchor function entity keeps the media connection with the content source unchanged under the control of the control command, and only changes the media flow direction with the UE.
  • the function of the media anchoring function entity is to implement a function of fixed media stream flow between the content source and the UE, that is, regardless of how the UE switches, the content source only needs to media.
  • the stream is delivered to the media anchoring function entity without changing the media stream of the content source as the UE switches; likewise, regardless of how the content source is switched, the UE only needs to receive the media stream from the media anchoring function entity, without the content
  • the switching of the source changes the flow direction of the media stream of the UE.
  • FIG. 4 is a structural block diagram of a system for implementing network television service switching according to an embodiment of the present invention.
  • the system includes: a handover control function entity 101, and a media anchor function entity 102.
  • Other entities implementing the basic functions of the network television system are also shown in FIG. 4, including: a session control function entity 103, a user equipment (User Equipment) 104, a content source 105, and a network television application server (IPTV AS, IPTV App ica t Ion Server 106 and other network entities 107.
  • IPTV AS IPTV App ica t Ion Server
  • the handover control function entity 101 is configured to receive a service request forwarded by the session control function entity 103, and control the media anchor function entity 102 to process the media stream according to the service request.
  • the control information sent by the handover control function entity 101 to the media anchor function entity 102 may be forwarded by the session control function entity 103 or directly to the media anchor function entity 102, as indicated by the dashed arrow in FIG.
  • the media anchoring function entity 102 processes the media stream under the control of the handover control function entity 101, receives the IPTV service media stream sent by the content source 105, and transmits the IPTV service media stream to the UE 104.
  • the session control function entity 103 is configured to perform session control, management, routing, and the like. For example, The service request route of the UE 104 is forwarded to the handover control function entity 101, and the service response is sent to the UE 104; the control information of the handover control function entity 101 is forwarded to the media anchor function entity, which will be processed by the media anchor function entity 102. The service request is sent to the IPTV AS 106, and the feedback of the service response and the like is received.
  • the UE 104 is a device for the user to receive the network television service, and is configured to initiate various IPTV service requests to the session control function entity 103, and receive the request response replied by the session control function entity 103.
  • the IPTV service media sent by the media anchor function entity 102 is received. flow.
  • the content source 105 is an entity that provides IPTV service content to the user for transmitting the IPTV service media stream to the media anchoring function entity 102.
  • the content source 105 can be a media server or a UE.
  • the IPTV AS 106 is an application server for processing IPTV service request logic.
  • the other network entity 107 is an entity that interacts with the IPTV AS 106 during the execution of the IPTV service logic.
  • Figure 5 is a flow chart showing the process of establishing a service connection on the user side by the system shown in Figure 4. As shown in Figure 5, the following steps are included:
  • Step 501 The UE 104 initiates an IPTV service request carrying the UE session description information to the session control function entity 103, and the session control function entity 103 sends the IPTV service request to the handover control function entity 101.
  • Step 502 The handover control function entity 101 controls the media anchor function entity 102 to perform media processing by using the session control function entity 102, and converts the UE session description information into the media anchor function entity session description information, and returns to the handover control function entity 101. .
  • the handover control function entity 101 transmits the media anchor function entity session description information to the session control function entity 102.
  • Step 503 The session control function entity 103 initiates an IPTV service request carrying the media anchor function entity session description information to the IPTV AS 106.
  • Step 504 The IPTV AS 106 receives the IPTV carrying the media anchor function entity session description information. After the service request, it interacts with other network entities 107 to complete the IPTV service processing, and returns a service response to the session control function entity 103, and the session control function entity 103 returns the service response to the media anchor function entity 102.
  • Step 505 After receiving the service response, the media anchoring function entity 102 sends the media anchor function entity session description information to the UE 104 to complete the service connection with the UE 104.
  • the IPTV service media stream may be transmitted from the content source 105 to the media anchor function entity 102 in a unicast or multicast manner, such as when the LTV service is used.
  • the VoIP service media stream of the media anchoring function entity 102 to the UE 104 may also be unicast or multicast, for example, according to the number of users requesting the same service.
  • the media anchoring entity 102 has a multicast joining capability, and when the media stream of the content source 105 to the media anchoring functional entity 102 is multicast, it can join the multicast group and between the media anchoring functional entity 102 and the UE 104.
  • the media anchoring entity 102 performs multicast to unicast conversion; when the media anchoring function entity 102 and the UE 104 are multicast, the switching control function entity 01
  • the media anchor function entity 102 under control becomes a new multicast source, and the media stream is converted from old multicast to new multicast.
  • the media anchoring function entity 102 When the media stream of the content source 105 to the media anchoring function entity 102 is unicast, and the media stream between the media anchoring function entity 102 and the UE 104 is also unicast, the media anchoring function entity 102 performs the media stream.
  • the unicast to unicast conversion is sent to the UE 104; when the media anchoring functional entity 102 and the UE 104 are also multicast, the media anchoring functional entity 102 becomes a new multicast source under the control of the handover control functional entity 101. And unicast to multicast conversion of the media stream.
  • the media anchoring function entity 102 acts as a media control agent, and ends the media control request initiated by the UE 104, such as a real-time streaming (RTSP, Rea lTM Resizing Protoco l) control request.
  • RTSP real-time streaming
  • the media control request initiated by the UE 104 and the proxy UE 104 initiates a corresponding media control request to the content source.
  • FIG. 6 is a flow chart of a process of performing user-side service switching in the system shown in FIG. In this process, The user side service is handed over from UE1 to UE2. As shown in Figure 6, the process includes the following steps:
  • Step 601 The UE1 initiates a handover request carrying the address of the UE2 to the session control function entity 103, and the session control function entity 103 routes the handover request to the handover control function entity 101.
  • Step 602 the handover control function entity 101 performs handover logic, and controls the functional entity through the session.
  • a service establishment request that is, a session request
  • the UE2 returns a service establishment response to the switch control function entity 101 through the control function entity 103.
  • Step 603 the handover control function entity 101 controls the media anchor function entity 102 to complete the media connection with the UE2 through the session control function entity 103, and copies the media stream sent to the UE1 to the UE2, that is, the media anchor function entity 102.
  • the media stream that sends the content source 105 to the UE1 is simultaneously transmitted to the UE1 and the UE2.
  • Step 604 The handover control function entity 101 associates two sessions of UE1 and UE2, returns a handover response to UE1, and controls the media anchor function entity 102 to disconnect the media connection with UE1.
  • the system shown in FIG. 4 implements the service switching on the user side, and ensures the continuity of the service during the handover process.
  • FIG. 7 is a flow chart showing the process of establishing a service connection on the content source side by the system shown in FIG. As shown in Figure 7, the following steps are included:
  • Step 701 The content source 105 initiates an IPTV service request carrying the content source session description information to the session control function entity 103, and the session control function entity 103 sends the IPTV service request to the switch control function entity 101.
  • Step 702 The handover control function entity 101 controls the media anchor function entity 102 to perform media processing by using the session control function entity 102, and converts the content source session description information into the media anchor function entity session description information, and returns to the handover control function entity. 101.
  • the handover control function entity 101 transmits the media anchor function entity session description information to the session control function entity 102.
  • Step 703 The session control function entity 103 initiates an IPTV service request carrying the media anchor function entity session description information to the IPTV AS 106.
  • Step 704 The IPTV AS 106 receives the IPTV carrying the media anchor function entity session description information. After the service request, the user interacts with other network entities to complete the IPTV service processing, and returns a service response to the session control function entity 103. The session control function entity 103 returns the service response to the media anchor function entity 102.
  • Step 705 After receiving the service response, the media anchor function entity 102 sends the media anchor function entity session description information to the content source 105 to complete the service connection with the content source 105.
  • the IPTV service media stream may be transmitted from the content source 105 to the media anchor function entity 102 in a unicast or multicast manner, and the media anchor function entity 102 to the UE.
  • the transmission mode of the IPTV service media stream of the 104 may also be a unicast or multicast mode. For example, when the LTV service is used, the multicast mode is used, and the V0D service is used in the unicast mode.
  • the media anchoring work entity 102 joins the multicast group, and the media stream between the media anchoring functional entity 102 and the UE 104 is unicast or During multicast, the media anchoring entity 102 performs multicast to unicast conversion of the media stream or old multicast to new multicast conversion of the media stream.
  • the media anchoring function entity 102 bills the media stream.
  • the broadcast to unicast is sent to the UE 104.
  • the media anchor function entity 102 and the UE 104 are also multicast, the media anchor function entity 102 becomes a new multicast source under the control of the handover control function entity 101.
  • the unicast to multicast conversion of the media stream is not limited to
  • the media anchor function entity 102 acts as a media control agent, terminates the media control request initiated by the UE 104, and the proxy UE 104 initiates a corresponding media control request to the content source.
  • FIG. 8 is a flow chart of the process of the content source side service switching performed by the system shown in FIG. 4.
  • the content source side service is switched from content source 1 to content source 2.
  • the process includes the following steps:
  • Step 801 The content source 1 initiates a handover request carrying the address of the content source 2 to the session control function entity 103, and the session control function entity 103 routes the handover request to the handover control function entity 101.
  • the handover control function entity 101 executes the handover logic, and initiates a service establishment request, that is, a session request, to the content source 2 through the session control function entity 103.
  • the content source 2 returns a service establishment response to the handover control function entity 101 through the control function entity 103.
  • step 803 the handover control function entity 101 controls the media anchor function entity 102 to complete the media connection with the content source 2 through the session control function entity 103, but only forwards the media stream of the content source 1 to the UE 104.
  • Step 804 the handover control function entity 101 associates two sessions of the content source 1 and the content source 2, returns a handover response to the content source 1, controls the media anchor function entity 102 to disconnect the media connection with the content source 1, and forwards The media stream of content source 2 is sent to the UE 104.
  • the system shown in Figure 4 implements the service switching on the content source side and ensures the continuity of the service in the process.
  • the IP multimedia subsystem (IMS, IP Multimedia Subsystem) is used as a preferred embodiment to describe the handover of a typical IPTV LTV service and the handover process of a VOD service from the user side and the content source side.
  • the switching of the content source side is described by taking the content source as the UE as an example.
  • CSCF Call Session Control Function
  • FIG. 9 is a flow chart showing the process of establishing an LTV service connection on the user side of the IMS system according to an embodiment of the present invention. As shown in 9, the following steps are included:
  • the UE sends an LTV service request to the CSCF, where the LTV service request carries the identifier of the program and the session descriptor protocol (SDP, Session Descr ipt ion Protocol) information of the UE; after the CSCF performs the initial filter rule (IFC, Initial Filter Codex) processing,
  • the LTV service request is sent to the handover control function entity.
  • Step 902 After receiving the LTV service request, the handover control function entity controls the media anchor function entity to perform media processing, converts the UE SDP information into the media anchor function SDP information, and returns the information to the handover control function entity through the CSCF.
  • Step 903 The CSCF sends an LTV service request to the IPTV AS, where the program identifier and the medium are carried. Body anchor function SDP information.
  • Step 904 After receiving the LTV service request, the IPTV AS interacts with other network entities to obtain information such as the multicast address MA1 and completes the LTV service processing.
  • Step 905 The IPTV AS returns an LTV service response to the CSCF, where the information carries the multicast address MA1 of the content source, and the CSCF returns the LTV service response to the handover control function entity.
  • Step 906 The handover control function entity sends the LTV service response that carries the information such as the multicast address MA1 of the content source to the media anchor function entity through the CSCF, and the media anchor function entity joins the multicast group of the content source.
  • step 907 to step 908 are performed; when the media anchoring function entity and the UE are multicast, step 909 to step 912 are performed.
  • Step 907 After the media anchoring function entity joins the multicast group of the content source, performs multicast to unicast conversion and media format conversion on the media stream received from the content source, for example, codec conversion: from H 264 conversion to MPEG4, resolution conversion: from 800 ⁇ 600 to 300 ⁇ 200, etc.; and the media anchoring function entity returns response information to the handover control function entity through the CSCF, which carries the media anchor function SDP information, and the media
  • the anchor function DSP information includes a unicast address; the handover control function entity sends a response message to the CSCF.
  • Step 908 The CSCF sends an LTV service request response to the UE, where the media anchor function SDP information is carried.
  • the LTV service establishment between the media anchoring function entity and the UE is unicast.
  • Step 909 The handover control function entity sends the control information and the multicast address MA2 of the media anchor function entity to the media anchor function entity through the CSCF, and controls the media anchor function entity to become a new multicast source, and the media anchor function entity pair
  • the media stream received by the content source performs the conversion of the old multicast to the new multicast and the conversion of the media format.
  • Step 910 The media anchoring function entity returns a response message to the handover control function entity through the CSCF, where the media anchor function SDP information is carried, and the media anchor function SDP information includes a multicast address; the handover control function entity sends a response message to the CSCF.
  • Step 911 The CSCF sends an LTV service request response to the UE, where the media anchor function SDP information is carried.
  • Step 912 The UE joins the multicast group.
  • the establishment of the LTV service when the media anchoring function entity and the UE are multicast is completed.
  • the content source that is, the media stream between the LTV multicast source and the media anchor function entity is multicast, and the media stream of the media anchor function entity to the UE is unicast or Multicast, as indicated by the dashed arrow in Figure 9.
  • FIG. 10 is a flowchart of a process of switching an LTV service from UE1 to UE2 in an IMS system according to an embodiment of the present invention. As shown in 10, the following steps are included:
  • Step 1001 The UE1 sends an LTV service switching request to the handover control function entity through the CSCF, where the address of the UE2 is carried.
  • Step 1002 The handover control function entity initiates a service establishment request to the UE2 through the CSCF.
  • Step 1003 The UE2 returns a service establishment request response to the handover control function entity by using the CSCF, where the SDP information of the UE2 is carried.
  • Step 1004 The handover control function entity sends control information to the media anchor function entity through the CSCF, where the SDP information of the UE2 is carried, the media anchor function entity is controlled to perform media processing, and the SDP information of the UE2 is converted into the media anchor function SDP information.
  • Step 1005 The media anchoring function entity returns a response message to the handover control function entity through the CSCF, where the media anchor function SDP information is carried.
  • Step 1006 The handover control function entity sends control information to the media anchor function entity through the CSCF, controls the media anchor function entity to complete the media connection with the UE2, and simultaneously copies and distributes the media stream sent to the UE1 to the UE2, as shown in the figure.
  • the dotted arrow in 10 is shown.
  • the UE2 joins the multicast group, as shown by the dotted line in FIG.
  • Step 1007 The handover control function entity sends handover response information to the UE1 through the CSCF.
  • Step 1008 UE1 returns a session end information to the handover control function entity through the CSCF, and switches The control function entity also returns handover end information to UE1.
  • Step 1009 The handover control function entity sends control information to the media anchor function entity through the CSCF, and controls the media anchor function entity to disconnect the media connection with the UE1. At this time, the media anchoring function entity only sends the media stream to UE2.
  • the LTV service switching process on the user side is completed, and the process can ensure the continuity of the service during the handover process.
  • FIG 11 is a flow chart showing the process of establishing a V0D service connection on the user side of the IMS system according to an embodiment of the present invention. As shown in Figure 11, the following steps are included:
  • Step 1101 The UE sends a VOD service request to the CSCF.
  • the V0D service request carries the identifier of the program and the SDP information of the UE.
  • the CSCF performs the IFC process, the V0D service request is sent to the handover control function entity.
  • Step 1102 After receiving the V0D service request, the change control function entity controls the media anchor function entity to perform media processing, converts the UE SDP information into the media anchor function SDP information, and returns the information to the switch control function entity through the CSCF.
  • Step 1103 The CSCF sends a VOD service request to the IPTV AS, where the program identifier and the media anchor function SDP are carried.
  • Step 1104 After receiving the V0D service request, the IPTV AS interacts with other network entities to perform media resource scheduling, obtains information such as the media server address, and completes V0D service processing.
  • Step 1105 The IPTV AS returns a VOD service response to the CSCF, where the SDP information of the media server is carried, and the CSCF returns the VOD service response to the handover control function entity.
  • Step 1106 The handover control function entity sends the V0D service response to the media anchor function entity through the CSCF.
  • step 1107 to step 1108 are performed; when the media anchor function entity and the UE are multicast, step 11 09 to step 1 112 are performed.
  • Step 1107 After receiving the V0D service response, the media anchoring function entity performs unicast to unicast conversion and media format conversion on the media stream received from the content source, and performs handover control through the CSCF.
  • the function entity returns response information, where the media anchor function SDP information is carried, and the SDP information includes a unicast address; the handover control function entity sends the response information to the CSCF.
  • Step 1108 The CSCF sends a VOD service request response to the UE, where the media anchor function SDP information is carried.
  • Step 1109 The handover control function entity sends the control information and the multicast address of the media anchor function entity to the media anchor function entity through the CSCF, and controls the media anchor function entity to become a new multicast source, and the media anchor function entity pairs the slave content.
  • the media stream received by the source is converted from unicast to multicast and converted in media format.
  • Step 1110 The media anchoring function entity returns a response message to the handover control function entity through the CSCF, where the media anchor function SDP information is carried, and the SDP information includes a multicast address; the handover control function entity sends the response information to the CSCF.
  • Step 1111 The CSCF sends a VOD service request response to the UE, where the media anchor function SDP information is carried.
  • Step 1112 The UE joins the multicast group.
  • the establishment of the V0D service when the media anchoring function entity and the UE are multicast is completed.
  • the media stream between the content source, that is, the VOD service media server and the media anchor function entity is unicast, and the media flow between the media anchor function entity and the UE is unicast or Multicast, as indicated by the dashed arrow in Figure 11.
  • Step 111 3 UE to the media
  • the anchor function entity initiates an RTSP control request, and the media anchor function control entity forwards the RTSP control request to the VOD service media server.
  • Step 1114 The VOD service media server returns an RTSP control request response message to the media anchor control function entity, and the media anchor control function entity forwards the RTSP control request response message to the UE.
  • FIG. 12 is a process flow of a VOD service switched from UE1 to UE2 in an IMS system according to an embodiment of the present invention.
  • Step 1201 The UE1 sends a VOD service switching request to the handover control function entity by using the CSCF, where the UE1 carries the address, the breakpoint information, the program identifier, and the like information of the UE2.
  • Step 1202 The handover control function entity initiates a service establishment request to the UE2 through the CSCF.
  • Step 1203 The UE2 returns a service establishment request response to the handover control function entity by using the CSCF, where the SDP information of the UE2 is carried.
  • Step 1204 The handover control function entity sends control information to the media anchor function entity through the CSCF, where the breakpoint information is carried, the media anchor function entity is controlled to perform media processing, and the SDP information of the UE2 is converted into the media anchor function SDP information.
  • Step 1205 The media anchoring function entity returns a response message to the handover control function entity through the CSCF, where the media anchor function SDP information is carried.
  • Step 1206 The handover control function entity sends control information to the media anchor function entity through the CSCF, and controls the media anchor function entity to complete the media connection with the UE2.
  • step 1206 the UE2 joins the multicast group, as shown by the dotted line in FIG.
  • Step 1207 The media anchoring function entity sends an RTSP control request that starts playing from the breakpoint to the V0D service media server, and simultaneously sends the media stream sent by the VOD service media server to UE1 and UE2, as indicated by the dotted arrow in FIG.
  • Step 1208 The handover control function entity sends handover response information to the UE1 through the CSCF.
  • Step 1209 The UE1 returns the session end information to the handover control function entity through the CSCF, and the handover control function entity also returns the handover end information to the UE1.
  • Step 121 0 The handover control function entity sends control information to the media anchor function entity through the CSCF, and controls the media anchor function entity to disconnect the media connection with the UE1. At this time, the media anchoring function entity only sends the media stream to UE2.
  • FIG. 13 is a flowchart of a process for establishing an LTV service connection on an content source side of an IMS system according to an embodiment of the present invention. As shown in Figure 13, the following steps are included:
  • Step 1301 The content source sends an LTV service upload request to the CSCF, where the SDP information and content metadata of the content source are carried.
  • the CSCF performs the IFC process and sends the LTV service upload request to the handover control function entity.
  • Step 1302 After receiving the LTV service upload request, the handover control function entity controls the media anchor function entity to perform media processing, converts the SDP information of the content source into the media anchor function SDP information, and returns the switch control function through the CSCF. entity.
  • Step 1303 The CSCF sends an LTV service upload request to the IPTV AS, where the content metadata and the media anchor function SDP information are carried.
  • Step 1304 After receiving the LTV service upload request, the IPTV AS interacts with other network entities to complete the LTV service processing.
  • the LTV service processing in this step includes: querying user content upload authority, obtaining program identifier, obtaining multicast address, delivering content metadata, program identification, and performing data organization of an electronic program guide (EPG).
  • EPG electronic program guide
  • Step 1305 The IPTV AS saves the program identifier and the multicast address, and returns the program identifier and the multicast address to the handover control function entity through the CSCF.
  • Step 1306 the handover control function entity sends the program identification and the multicast address to the media anchor function entity through the CSCF.
  • Step 1307 When the media stream of the content source to the media anchoring function entity is in a multicast propagation mode, the media anchoring function entity joins the multicast group, and performs multicast to multicast conversion and media format conversion of the media stream. Otherwise, when the media stream of the content source to the media anchoring function entity is in the unicast propagation mode, the media anchoring function entity performs unicast-to-multicast conversion and media format conversion on the media stream. Then, the media anchoring function entity returns the media anchoring function SDP information and the program identifier to the handover control function entity through the CSCF, and the handover control function entity sends the media anchoring function SDP information and the program identifier to the CSCF. Step 1 308: The CSCF sends an LTV service upload request response to the content source, where the media anchor function SDP information and the program identifier are carried.
  • the media stream between the content source and the media anchor function entity is unicast or multicast, and the media stream of the media anchor function entity to the UE is multicast, as shown in the figure.
  • the dotted arrow in 1 3 is shown.
  • FIG 14 is a flow chart showing the process of switching the LTV service from the content source 1 to the content source 2 in the IMS system according to the embodiment of the present invention. As shown in Figure 14, the following steps are included:
  • Step 1401 The content source 1 sends an LTV service switching request to the handover control function entity through the CSCF, where the address URL of the content source 2 and the program identifier are carried.
  • Step 1402 The handover control function entity initiates a service establishment request to the content source 2 through the CSCF.
  • Step 1404 The handover control function entity sends control information to the media anchor function entity through the CSCF, where the SDP information of the content source 2 is carried, the media anchor function entity is controlled to perform media processing, and the SDP information of the content source 2 is converted into a media anchor. Function SDP information.
  • Step 1405 The media anchoring function entity returns a response message to the handover control function entity through the CSCF, where the media anchor function SDP information is carried.
  • Step 1406 the handover control function entity sends control information to the media anchor function entity through the CSCF, controls the media anchor function entity to complete the media connection with the content source 2, and the media anchor function entity simultaneously receives the media stream 1 of the content source 1 And the media stream 2 of the content source 2, and only the media stream 1 of the content source 1 is forwarded to the UE.
  • Step 1407 The handover control function entity sends the handover response information to the content source 1 through the CSCF.
  • Step 1409 the handover control function entity sends a control letter to the media anchor function entity through the CSCF. And control the media anchoring function entity to disconnect the media connection with the content source 1, and forward the media stream 2 of the content source 2 to the UE.
  • the LTV service switching process on the content source side is completed, and the process can ensure the continuity of the service during the handover process.
  • the content source may be a media server or a UE.
  • the UE provides the media content, that is, the media stream, as the content source of the VOD service, the UE has the following two transmission modes:
  • the content source UE initiates a VOD service upload request to the IPTV AS, and the IPTV AS specifies a media server for storing the media content; the media content of the content source UE is processed by the media anchor function entity and uploaded to the media server; When the V0D service requests, the media content is provided by the media server.
  • the content source UE only publishes its content information, but does not publish its media content to the server on the network side, and the media content is stored locally in the content source UE; when other UEs initiate the VOD service request, the IPTV AS points the VOD service request to the media anchor.
  • the function entity, the media anchor function entity requests the corresponding media content from the content source UE.
  • FIG. 15 is a flow chart showing the process of establishing a V0D service connection on the content source side of the IMS system according to an embodiment of the present invention. As shown in Figure 15, the following steps are included:
  • Step 1501 The content source sends a VOD service upload request to the handover control function entity by using the CSCF, where the SDP information, content metadata, and the like of the content source are carried.
  • Step 1502 After receiving the VOD service upload request, the handover control function entity controls the media anchor function entity to perform media processing, converts the SDP information of the content source into the media anchor function SDP information, and returns the switch control function through the CSCF. entity.
  • Step 1503 The CSCF sends a VOD service upload request to the IPTV AS, where the content metadata and the media anchor function SDP information are carried.
  • Step 1504 After receiving the VOD service upload request, the IPTV AS interacts with other network entities to complete the V0D service processing.
  • the VOD service processing in this step includes: querying user content upload authority, obtaining program identifier, delivering content metadata, program identifier, and performing data organization of an electronic program list (EPG, E lec ronic ic Programme Gu ide).
  • EPG electronic program list
  • Step 1505 The IPTV AS returns a V0D service upload request response message to the handover control function entity through the CSCF.
  • Step 1506 The handover control function entity sends the VOD service upload request response information to the media anchor function entity through the CSCF.
  • Step 1507 The media anchoring function entity multicasts the media stream to the multicast, unicast to multicast, and the media stream according to the content source to the media anchoring functional entity, and the media anchoring function media to the UE. Broadcast to unicast or multicast to unicast conversion and media format conversion. Then, the media anchoring function entity media anchoring function entity returns a response message to the switching control function entity through the CSCF, where the media anchoring function SDP information is carried, and the switching control function entity sends the response information to the CSCF.
  • Step 1508 the CSCF sends a response message to the content source.
  • the media stream between the content source and the media anchor function entity is unicast or multicast, and the media stream of the media anchor function entity to the UE is unicast or multicast. , as shown by the dashed arrow in Figure 15.
  • FIG. 16 is a flow chart showing the process of switching the VOD service from the content source 1 to the content source 2 in the IMS system according to the embodiment of the present invention. As shown in 16, the following steps are included:
  • Step 1601 The content source 1 sends a V0D service switching request to the handover control function entity through the CSCF, where the content of the content source 2, the breakpoint information, the program identifier, and the like are carried.
  • Step 1602 The handover control function entity initiates a service establishment request to the content source 2 through the CSCF, where the breakpoint information and the program identifier are carried.
  • step 1603 the content source 2 returns a service establishment request response to the handover control function entity through the CSCF, where the SDP information of the content source 2 is carried.
  • Step 1604 The handover control function entity sends control information to the media anchor function entity through the CSCF, where the SDP information of the content source 2 is carried, the media anchor function entity is controlled to perform media processing, and the SDP information of the content source 2 is converted into media anchoring. Function SDP information.
  • Step 1605 The media anchoring function entity returns a response message to the handover control function entity through the CSCF, where the media anchor function SDP information is carried.
  • Step 1606 the handover control function entity sends control information to the media anchor function entity through the CSCF, controls the media anchor function entity to complete the media connection with the content source 2, and the media anchor function entity simultaneously receives the media stream 1 of the content source 1 And the media stream 2 uploaded by the content source 2 from the breakpoint, and only the media stream of the content source 1 is forwarded to the user.
  • Step 1607 The handover control function entity sends the handover response information to the content source 1 through the CSCF.
  • Step 1609 The handover control function entity sends control information to the media anchor function entity through the CSCF, controls the media anchor function entity to disconnect the media connection with the content source 1, and forwards the media stream 2 of the content source 2 to the user.
  • V0D service switching process on the content source side is completed, which ensures the continuity of the service during the handover process.
  • FIG. 17 is a structural block diagram of an apparatus for implementing a switching control function according to an embodiment of the present invention. As shown in FIG. 17, a device for implementing a switching control function is shown in FIG. The 1701 includes: a media control module 1702 and a switching control module 1703.
  • the media control module 1702 is configured to receive a service request, send media control information to the UE and/or the streaming media content delivery entity, send the processed service request to the IPTV AS, and receive the media control sent by the IPTV AS.
  • the information is processed and sent to the streaming media content delivery entity and/or the UE.
  • the handover control module 1703 is configured to receive the handover request sent by the handover initiation entity, and send the message to the UE and/or the streaming media content delivery entity: first establishing and switching Accepting the media connection between the entities, simultaneously sending the media stream to the handover originating entity and the handover accepting entity or simultaneously transmitting the entity from the handover
  • the media stream selected by the entity is selected to be forwarded to the UE, and then the handover control information of the media connection with the handover originating entity is cut off.
  • FIG. 18 is a structural block diagram of an apparatus for implementing the media anchoring function according to an embodiment of the present invention. As shown in FIG. 18, a media anchoring function is implemented.
  • the device 1801 includes: an instruction receiving module 1 802, a media stream transceiver module 1803, and a media control requesting proxy module 1805, and the media stream transceiver module includes a media stream processing module 1804.
  • the media stream transceiver module 1803 receives the media stream sent by the content source, and the media stream processing module 1804 unicasts the media stream received by the media stream transceiver module 1803 to multicast, or unicasts to unicast.
  • the media stream transceiver module 18 G 3 sends the media stream processed by the media stream processing module 18 G4 to the UE.
  • the instruction receiving module 1802 is configured to receive external media control information during the establishment of the network television service, and control the media stream transceiver module 1803 to process the media stream; when the network television service is switched, receive external switching control information, and control
  • the media stream transceiver module 1803 first establishes a media connection with the handover accepting entity, and simultaneously sends the media stream to the handover initiating entity and the handover accepting entity or forwards the media stream selection received from the handover sending entity and the receiving entity to the UE, and then Cut off the media connection with the switching originating entity.
  • the media control request proxy module 1805 is configured to receive a media control request sent by the UE, and forward the media control request to the content source.

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  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

L'invention concerne un procédé et un système permettant de commuter un service de télévision par protocole internet (IPTV). Par l'introduction d'une entité de fonction de commande de commutation et/ou d'une entité de fonction d'ancrage multimédia dans un système IPTV, et par l'établissement en premier lieu de la connexion multimédia d'une entité de réception de commutation, puis par coupure de la connexion multimédia d'une entité initiatrice de commutation, on effectue la commutation d'un service IPTV de l'entité initiatrice de commutation à l'entité de réception de commutation, et la continuité du service IPTV pendant la commutation est assurée.
PCT/CN2008/070422 2007-03-14 2008-03-06 Procédé et système permettant d'obtenir une commutation de service de télévision par protocole internet (iptv) WO2008110094A1 (fr)

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CN101521817B (zh) * 2009-03-17 2011-03-16 中兴通讯股份有限公司 一种用于改善手机电视播放连续性的方法及其终端
EP2317754A1 (fr) 2009-10-30 2011-05-04 Thomson Licensing, Inc. Procédé de réception d'audio/vidéo numérique et appareil correspondant
CN104796384B (zh) * 2014-01-20 2020-09-29 南京中兴新软件有限责任公司 呼叫处理方法、装置及系统
CN112653925B (zh) * 2020-12-21 2023-03-24 苏州科达特种视讯有限公司 媒体播放的跨设备转移方法、系统、设备及存储介质

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