WO2010115331A1 - 内容定位方法及内容分发网络节点 - Google Patents

内容定位方法及内容分发网络节点 Download PDF

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Publication number
WO2010115331A1
WO2010115331A1 PCT/CN2009/073789 CN2009073789W WO2010115331A1 WO 2010115331 A1 WO2010115331 A1 WO 2010115331A1 CN 2009073789 W CN2009073789 W CN 2009073789W WO 2010115331 A1 WO2010115331 A1 WO 2010115331A1
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WO
WIPO (PCT)
Prior art keywords
content
service
cdn node
function entity
control function
Prior art date
Application number
PCT/CN2009/073789
Other languages
English (en)
French (fr)
Inventor
夏宏飞
Original Assignee
中兴通讯股份有限公司
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 中兴通讯股份有限公司 filed Critical 中兴通讯股份有限公司
Priority to RU2011144802/07A priority Critical patent/RU2530016C2/ru
Priority to US13/259,305 priority patent/US9584870B2/en
Priority to EP09842892.3A priority patent/EP2418848A4/en
Publication of WO2010115331A1 publication Critical patent/WO2010115331A1/zh

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Classifications

    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04NPICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N21/00Selective content distribution, e.g. interactive television or video on demand [VOD]
    • H04N21/60Network 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 
    • H04N21/61Network physical structure; Signal processing
    • H04N21/6106Network physical structure; Signal processing specially adapted to the downstream path of the transmission network
    • H04N21/6125Network physical structure; Signal processing specially adapted to the downstream path of the transmission network involving transmission via Internet
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L67/00Network arrangements or protocols for supporting network services or applications
    • H04L67/50Network services
    • H04L67/51Discovery or management thereof, e.g. service location protocol [SLP] or web services
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L67/00Network arrangements or protocols for supporting network services or applications
    • H04L67/50Network services
    • H04L67/60Scheduling or organising the servicing of application requests, e.g. requests for application data transmissions using the analysis and optimisation of the required network resources
    • H04L67/63Routing a service request depending on the request content or context
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04NPICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N21/00Selective content distribution, e.g. interactive television or video on demand [VOD]
    • H04N21/20Servers specifically adapted for the distribution of content, e.g. VOD servers; Operations thereof
    • H04N21/23Processing of content or additional data; Elementary server operations; Server middleware
    • H04N21/231Content storage operation, e.g. caching movies for short term storage, replicating data over plural servers, prioritizing data for deletion
    • H04N21/23103Content storage operation, e.g. caching movies for short term storage, replicating data over plural servers, prioritizing data for deletion using load balancing strategies, e.g. by placing or distributing content on different disks, different memories or different servers
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04NPICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N21/00Selective content distribution, e.g. interactive television or video on demand [VOD]
    • H04N21/20Servers specifically adapted for the distribution of content, e.g. VOD servers; Operations thereof
    • H04N21/23Processing of content or additional data; Elementary server operations; Server middleware
    • H04N21/231Content storage operation, e.g. caching movies for short term storage, replicating data over plural servers, prioritizing data for deletion
    • H04N21/23116Content storage operation, e.g. caching movies for short term storage, replicating data over plural servers, prioritizing data for deletion involving data replication, e.g. over plural servers
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04NPICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N21/00Selective content distribution, e.g. interactive television or video on demand [VOD]
    • H04N21/20Servers specifically adapted for the distribution of content, e.g. VOD servers; Operations thereof
    • H04N21/23Processing of content or additional data; Elementary server operations; Server middleware
    • H04N21/239Interfacing the upstream path of the transmission network, e.g. prioritizing client content requests
    • H04N21/2393Interfacing the upstream path of the transmission network, e.g. prioritizing client content requests involving handling client requests
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04NPICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N21/00Selective content distribution, e.g. interactive television or video on demand [VOD]
    • H04N21/40Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
    • H04N21/47End-user applications
    • H04N21/472End-user interface for requesting content, additional data or services; End-user interface for interacting with content, e.g. for content reservation or setting reminders, for requesting event notification, for manipulating displayed content
    • H04N21/47202End-user interface for requesting content, additional data or services; End-user interface for interacting with content, e.g. for content reservation or setting reminders, for requesting event notification, for manipulating displayed content for requesting content on demand, e.g. video on demand
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04NPICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N21/00Selective content distribution, e.g. interactive television or video on demand [VOD]
    • H04N21/60Network 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 
    • H04N21/65Transmission of management data between client and server
    • H04N21/658Transmission by the client directed to the server
    • H04N21/6581Reference data, e.g. a movie identifier for ordering a movie or a product identifier in a home shopping application

Definitions

  • IPTV Internet Protocol Television
  • IP bearer network The general name of the equipment of the business.
  • the IPTV standard is based on the Next Generation Network (NGN) IP Multimedia Subsystem (IP Multimedia Subsystem) and NGN non-IMS architecture, which can provide users with on-demand, live broadcast and video recording. And some new business.
  • NGN Next Generation Network
  • IP Multimedia Subsystem IP Multimedia Subsystem
  • NGN non-IMS architecture NGN non-IMS architecture
  • the Content Delivery Network plays an important role in the IPTV system's Quality of Experience (QoE) protection and system stability.
  • the important functional entities within the CDN are mainly used to implement content location technology, scheduling and storage functions.
  • content location technology content location and playback need to be performed by the CDN host controller.
  • the CDN host controller may cause processing delay, which affects system performance and becomes a bottleneck of system performance. .
  • the processing delay can be reduced by increasing the CDN host controller to form a distributed CDN host controller for load sharing, this method increases the complexity and construction cost of the CDN host controller.
  • the present invention provides an improved content locating solution for solving the problems of long processing delay and high cost existing in the prior art.
  • a content locating method includes: a first content distribution network CDN node receives a service request sent from a service control function entity or an IPTV service control function entity, where the service request carries a content identifier for indicating a request and Content corresponding to the content identifier; if the first CDN node is unable to provide the content service requested by the service request, the first CDN node sends a query request to the CDN global controller to obtain the content service requested by the service request Information of the second CDN node, and requesting the second CDN node to provide the content service.
  • the content locating method includes: the service control function entity or the IPTV service control function entity receives a service request from the user equipment, where the service request carries the address information of the user equipment and the identifier of the content requested by the user equipment.
  • the service control function entity or the IPTV monthly control function entity selects the closest distance to the area to which the user equipment belongs based on the address information.
  • the CDN node; the service control function entity or the IPTV service control function entity sends a service request message to the CDN node, requesting the CDN node to provide a content service for the user equipment.
  • a content distribution network node is provided.
  • the content distribution network node according to the present invention comprises: a media control function entity and at least one content delivery function entity.
  • the media control function entity includes: a receiving module, a determining module, a selecting module, a querying module, and a sending module, where the receiving module is configured to receive a service request sent by the service control function entity or the IPTV service control function entity, where the service The request carries a content identifier, which is used to indicate that the content corresponding to the content identifier is requested; the determining module is configured to determine whether the content distribution network node can provide the content service requested by the service request; and the selecting module is used to determine in the determining module If the result is yes, the content delivery function entity that provides the content service is selected; the query module is configured to send a query request to the CDN global controller to obtain a second service capable of providing the content service if the result of the determination by the determination module is negative.
  • the CDN node is configured to send a service request to the second CDN node acquired by the query module, requesting the second CDN node to provide the content service, and a content delivery function entity, configured to provide the content service for the user equipment.
  • the service request is sent to the CDN node closest to the user equipment instead of being sent to the CDN global controller, and after receiving the service request, the CDN node cannot provide the user equipment for the user equipment.
  • the content service requested by the device sends a query request to the CDN global controller, and forwards the service request to provide the foregoing content for the user equipment.
  • FIG. 1 is a schematic structural diagram of an NGN-based IPTV system according to an embodiment of the present invention
  • FIG. 2 is a flowchart of a content locating method according to an embodiment of the present invention
  • FIG. 4 is a flow chart of the first embodiment
  • FIG. 5 is a flow chart of the second embodiment
  • FIG. 6 is a schematic structural diagram of a content distribution network node according to an embodiment of the present invention.
  • 20% of the content is deployed on the CDN node closest to the user, but the CDN node can provide 80% on-demand service, and the remaining 20% of the on-demand service content is deployed.
  • Central node usually the central node holds 100% of the content.
  • the failure rate of the edge node is very low.
  • nearly 80% of the on-demand services can be used for global redirection services through the CDN host controller. Therefore, the embodiment of the present invention provides an improved content locating scheme for the problem that content positioning and playback need to be performed by the CDN main controller, resulting in processing delay or excessive load causing failure.
  • the service control function entity or the IPTV service control function entity sends the service request to the CDN closest to the home area of the user equipment.
  • a node when the CDN node cannot provide the user equipment with the content service requested by the user equipment, acquires a CDN node capable of providing the content service through the CDN global controller, and sends the service request to the CDN node capable of providing the content service.
  • FIG. 1 is a schematic structural diagram of an NGN-based IPTV system according to an embodiment of the present invention.
  • the NGN-based IPTV system mainly includes: User Equipment (User Equipment, called UE) 11. Service Control Function (Service Control Function, SCF, if IMS in NGN, Core IMS) Core IMS ) 12. IPTV Service Control Functions (IPTV called IPTV SCF) 13. Content Delivery Network (CDN) 14.
  • User Equipment User Equipment
  • SCF Service Control Function
  • SCF Service Control Function
  • IPTV SCF IPTV Service Control Functions
  • CDN Content Delivery Network
  • the CDN 14 further includes: a content distribution network global controller, which may also be referred to as a CDN control function/Content Delivery Network (Global) Controller, or a content delivery device.
  • a content distribution network global controller which may also be referred to as a CDN control function/Content Delivery Network (Global) Controller, or a content delivery device.
  • Media Control Function Entity Media Control Function or Content Control Function or Cluster Controller or Content Distribution & Delivery & Location Control Functions, referred to as MCF or CCF or CC or CD&D&LCF 16
  • media delivery function entities Media Delivery Function or Content Delivery Function or Content Delivery and Storage Function, referred to as MDF or CDF or CD&SF).
  • the CDN node (or instance) (1, 2...n) includes a media control function entity 16 and a plurality of media delivery function entities 17.
  • the CDN node is not limited to the above-mentioned CDN node 1 and CDN node 2 (shown in the figure), and may be plural.
  • the entities and interfaces of the NGN-based IPTV system are separately described below.
  • the UE 11 may be a mobile phone with mobility capability, a set top box for a fixed network, a software-based soft terminal that implements a set-top box function, and a functional entity such as a home gateway. By interacting with the user, the UE can implement IPTV services such as on-demand and live broadcast.
  • the SCF 12 is connected to the UE 11, and is used as a set of main functional entities of the NGN service control layer, and is mainly used for session control, service authentication, authentication, and accounting.
  • this entity is Core IMS.
  • Core IMS is mainly used to provide a SIP-based session control mechanism for authenticating, authenticating, and requesting resource admission control subsystems for resource allocation.
  • the Core IMS interacts with the IPTV terminal, the IPTV application function entity, and the content distribution function entity to perform SIP sessions, and performs functions such as security, quality of service (QoS), billing, and roaming.
  • QoS quality of service
  • the IPTV SCF 13 is connected to the SCF 12 by using a Session Initiation Protocol (Sinus Initiation Protocol) to provide service authentication during session initiation or modification.
  • the functions include: checking user information and viewing Whether the user can legally use the selected content; credit restriction and credit control; and the IPTV media control function entity 16 that provides initial service for the system selection, wherein the functional entity is mainly for IPTV services such as on-demand, live broadcast, video recording, and time shift.
  • the IPTV SCF 13 is an IPTV SIP application server in the case of an IMS network, which corresponds to a set of IPTV Control and IPTV Application in the Open IPTV Forum standard organization, and corresponds to IPTV application functions and applications in the ITU-T standard. Application Support Functions and Service Support Functions.
  • CDN 14 connected to the UE through the Xc and Xd interfaces, where the Xc interface is connected
  • the UE is configured to control the media stream RTSP, and the UE is connected to the media stream RTP for transmission and media download through the Xd interface (the HTTP protocol may be adopted).
  • Interface A1 mainly used by the CDN global controller 15 to return its management to the IPTV SCF 13.
  • the C21/C22 interface through which the user media control function entity 16 media controls the media delivery function entity 17.
  • the C11/C12 interface (control interface) is implemented by the SIP protocol.
  • the CDN node queries the CDN global controller 15 for other CDN node information that can provide on-demand services through the interface; the CDN node can also use the interface to the CDN global controller. 15 on ⁇ 3 ⁇ 4 each node's service status information.
  • the content locating method includes the following steps (step S201 - step S203):
  • Step S201 In the specific implementation process, before the CDN node 1 receives the service request, the triggering of the process of step S201 may include the following steps: Step 1: The service control function entity or the IPTV service control function entity receives the user equipment to send The service request, where the service request carries the address of the user equipment and the content identifier; Step 2: The service control function entity or the IPTV service control function entity selects the CDN node 1 closest to the user equipment according to the area to which the user equipment belongs Step 3: The service control function entity or the IPTV service control function entity sends the foregoing service request to the CDN node 1.
  • the foregoing service request includes but is not limited to at least one of the following: an on-demand request, a network video recording request, and a true video on demand request.
  • Step S103 the CDN node 1 first determines whether it can provide the content service requested by the service request, specifically, the CDN node 1
  • the following method is used to determine whether it can be used for the above content: Step 1, the CDN node 1 determines whether there is content corresponding to the content identifier in its content delivery function entity, and if so, proceeds to step 2, otherwise, the CDN node 1 determines It cannot provide the above content service; Step 2: The CDN node 1 determines whether the content service currently provided by the content interaction entity has reached a given threshold (for example, 80%), and if so, determines that the CDN node 1 cannot provide the requested The content service, otherwise, determines that the CDN node 1 is capable of providing the requested content service.
  • a given threshold for example, 80%
  • the CDN node 1 determines that it cannot provide the content service requested by the service request, the CDN node 1 sends a query request to the CDN global controller to acquire information of the CDN node capable of providing the content service.
  • the CDN global controller queries the CDN node that can provide the content service, and returns a response message to the CDN node 1, where the response message carries information of the CDN node that can provide the content service.
  • the CDN global controller may return to the CDN node 1 all list information of CDN nodes that can provide the above content service, or may only return information of the optimal CDN node to the CDN node 1, and the CDN node 1 according to the CDN global controller
  • the returned node information acquires information of the CDN node 2 (which may be an optimal node) capable of providing the above content.
  • the CDN node 1 After acquiring the information of the CDN node 2, the CDN node 1 sends a service request to the CDN node 2 according to the information of the CDN node 2, requesting the CDN node 2 to provide the content service for the user equipment; after receiving the service request, the second CDN node receives the service request.
  • the method further includes the following steps: (1) the media control function entity in the CDN node 2 delivers the functional entity according to the internal content of the node.
  • the service status queries the URL address information of the serviceable content delivery function entity, and the content delivery function entity sends a request for an RTSP Description message (RTSP DESCRIBE), which describes the requested program information.
  • the URL of the request also carries user information of the user equipment, path information of the requested program, and the like.
  • the media delivery function entity in the CDN node 2 returns to the media control function entity to mention
  • the program description information of the service delivery entity of the service includes information such as content size, name, play time, IP address, and port.
  • the RTSP description message in step (1) and step (2) is optional, and the media control function entity may include description information of the content in the selected media delivery function entity.
  • the media control function entity in the CDN node 2 sends an RTSP session establishment message to the media delivery function entity in the CDN node 2, requesting to establish a session connection of the media channel.
  • the media delivery function entity in the CDN node 2 returns the session connection RTSP Session ID of the media delivery function entity that can provide the monthly service to the media control function entity.
  • the user equipment sends a play request to the CDN node 2 according to the identifier of the session, requesting to play the content corresponding to the content identifier.
  • a session is established between the first media control function entity in the CDN node 1 and the first media delivery function entity providing the content service in the CDN node 1 (RTSP Session) ), return the identity of the session to the user device.
  • the user equipment after returning the identifier of the session to the user equipment, the user equipment sends a play request to the CDN node 1 according to the identifier of the session, requesting to play the content corresponding to the content identifier.
  • the method may include the following steps: (1) The media control function entity in the CDN node 1 queries its managed media delivery managed by its node. The URL address information of the functional entity and a request to establish a session is sent to the selected media delivery function entity.
  • the step (1) may further include the following: the media control function entity in the CDN node 1 sends an RTSP DESCRIBE message to the media delivery function entity, and queries the SDP information of the media delivery function entity that can provide the service, where the RTSP DESCRIBE message carries There is URL address information and description information of the media content; the media delivery function entity returns an ACK message to the media control function entity, including SDP information; and the media control function entity initiates to the media delivery function entity
  • RTSP SETUP message RTSP session link of user establishment and media delivery function entity
  • media delivery function entity returns ID of content delivery session establishment to media control function entity, ie RTSP Session ID.
  • the media control function entity returns the ID of the content delivery session to the user equipment through the session initialization response.
  • the user equipment requests the CDN 1 node to perform on-demand, and the CDN node 1 provides a streaming service to the user equipment.
  • the step (3) may further include: the media control function entity to the media delivery function entity requesting RTSP PLAY or RTSP RECORD to request to play the content; the media delivery function entity confirms to the media control function entity, that is to be played The media control function entity confirms the user equipment, and is about to play; the media delivery function entity in the CDN node 1 sends an RTP stream to the user equipment for playing or recording.
  • the load of the CDN global controller can be reduced, and the processing delay can be reduced.
  • Another content locating method is also provided in accordance with an embodiment of the present invention.
  • FIG. 3 is a flow chart of another content locating method according to an embodiment of the present invention.
  • another content locating method includes the following steps (step S301 - step S305):
  • Step S301 The service control function entity or the IPTV service control function entity receives the service from the user equipment. a request, where the service request carries the address information of the user equipment and the identifier of the content requested by the user equipment;
  • Step S303 The service control function entity or the IPTV service control function entity selects the user equipment according to the address information.
  • Step S305 The service control function entity or the IPTV service control function entity sends a service request message to the CDN node, requesting the CDN node to provide a content service for the user equipment.
  • the CDN node may perform content positioning according to the method shown in FIG. 2 above. According to the foregoing content locating method provided by the embodiment of the present invention, a service request can be sent to a CDN node that is closest to the user equipment, thereby reducing processing delay.
  • FIG. 4 is a flowchart of the embodiment.
  • the content service provided by the user equipment in the embodiment is described below with reference to FIG. 1.
  • the process mainly includes the following steps: Step S401: The service control function entity 12 or 13 receives the session initialization sent from the UE 11 ( SIP INVITE ) Request, where the SDP of the request includes the IP address, port and content identifier of the UE 11.
  • the service control function entity 12 or 13 selects the CDN node to provide the service according to the area to which the UE 11 belongs, which is the CDN node 1 in this embodiment; and the IPTV service control function entity 13 periodically detects that the content distribution network 14 is providing the service. State, selecting the node controller 16 as close as possible and without failure; Step S403: The entity 16 of the CDN node 1 receiving the session initialization (SIP INVITE) request determines whether the CDN node 1 can provide the media service, specifically, the judgment basis includes not limited to:
  • Step S405 In the above step, the media control function entity 16 of the CDN node 1 determines that the CDN node 1 cannot provide the media service, and the media control function entity 16 in the CDN node 1 sends a SIP OPTION message to the CDN global controller 15, the query is the most An excellent CDN node that can provide a service, the node includes an IP address and a port number (the status information such as the distance from the UE 11 and the load of the node according to the node); Step S407: The CDN global controller 15 queries for a service that can be provided.
  • Step S409 The CDN global controller 15 returns the queryable node (or node list) information of the query to the media control function entity 16 in the CDN node 1;
  • Step S411 The media in the CDN node 2 to which the CDN node 1 selects The control function entity 16 sends a SIP INVITE message, which includes SIP Session ID information, requesting the CDN node 2 to provide a service request service;
  • Step S413 The media control function entity 16 in the CDN node 2 queries the serviceable media delivery within its node Information of the functional entity 16; the media control function entity 16 sends a request for the RTSP DESCRIBE message to the selected media delivery function entity 16, i.e., selects which program to broadcast.
  • Step S415 The media delivery function entity 16 in the CDN node 2 returns the serviceable service to the media control function entity 16 by using a response message (OK)
  • the program description information of the media delivery function entity 16 includes information such as a content size, a name, a play time, an IP address, and a port.
  • the media control function entity 16 selected in the above step S405 can provide the CDN node 1
  • the above steps S413 and S415 may be omitted.
  • Step S417 The media control function entity 16 in the CDN node 2 initiates an RTSP SETUP message to the media delivery function entity 16, and the user establishes an RTSP session link with 17;
  • Step S419 The media delivery function entity 16 in the CDN node 2 provides the media control function The entity 16 returns the ID of the content delivery session establishment by the response message (OK), that is, the RTSP Session ID;
  • Step S421 The media control function entity 16 in the CDN node 2 returns the content to the media control function entity 16 in the CDN node 1 through the response message.
  • the ID of the delivery session is the SIP Session ID and the RTSP Session ID;
  • Step S423 The media control function entity 16 in the CDN node 1 binds the ID of the content delivery session (ie, the RTSP Session ID and the SIP Session ID), and the result is obtained. The response is returned to the UE 11 through the session.
  • the session initialization response process between the media control function entity 16 -> UE 11 may be implemented by using an existing process, and is not specifically mentioned;
  • Step S425 UE UE 11 requests RTSP from the media control function entity 16 in the CDN node 2
  • Step S427 The media control function entity 16 in the CDN node 2 requests the media delivery function entity 16 to request RTSP PLAY or RTSP RECORD to request to play the content;
  • Step S429 The media delivery function entity in the CDN node 2 16 returns to the media control function entity 16 to confirm the information, indicating that the playback is about to be performed;
  • Step S431 The media control function entity 16 in the CDN node 2 returns the UEUE 11 confirmation message indicating that the playback is about to be performed;
  • Step S433 The media delivery function in the CDN node 2 The entity 16 sends an RTP stream to the UE 11 for playback or recording.
  • the CDN node 1 selected by the service control function entity or the IPTV service control function entity can provide the content service requested by the user equipment.
  • FIG. 5 is a flowchart of the embodiment. The content service of the user equipment in the embodiment is described below with reference to FIG. 1. As shown in FIG. 5, the process mainly includes the following steps: Step S501: The service control function entity 12 or the IPTV service control function entity 13 receives the slave UE 11 The sent session initialization (SIP INVITE) request includes the IP address, port, and content identifier of the UE 11 in the SDP of the request. The IPTV service control function entity 13 selects the CDN node to provide the service according to the area to which the UE 11 belongs.
  • SIP INVITE sent session initialization
  • the CDN node specifically, the IPTV service control function entity 13 periodically detects that the content distribution network 14 is providing the service. a state to select the node controller 16 as close as possible to the user equipment and without failure;
  • Step S503 The media control function entity 16 of the CDN node 1 receiving the SIP INVITE request determines whether or not it can provide the media service;
  • S505 The judgment result of the foregoing step is that the content of the user-on-demand exists in the CDN node 1 and can be accepted for on-demand, and the media control function entity 16 of the CDN node 1 selects the media delivery function entity 16 in the node that can provide the service, and media control
  • the function entity 16 sends an RTSP DESCRIBE message to the selected media delivery function entity 16 to query the SDP information of the media delivery function entity 16 that can provide the service, including the URL address information;
  • Step S507 The media delivery function entity 16 of the CDN node 1 returns an ACK message to the media control function entity 16, including SDP information.
  • Step S509 The media control function entity 16 of the CDN node 1 initiates an RTSP SETUP message to the media delivery function entity 16, and the user establishes an RTSP session link with 17;
  • Step S511 The media delivery function entity 16 of the CDN node 1 goes to the media control function entity 16 Returning the ID of the content delivery session establishment, that is, the RTSP Session ID;
  • Step S513 The media control function entity 16 of the CDN node 1 binds the ID of the content delivery session, that is, the RTSP Session ID and the SIP Session ID, and wins the result.
  • the session initialization response is returned to the UE 11.
  • the session initialization response process between the media control function entity 16 -> UE 11 may adopt an existing process, and details are not described herein again;
  • Step S515 The UE 11 to the media control function entity 16 requests RTSP PLAY (play) or RTSP RECORD (recording) Requesting to play the content, the request carries the RTSP session ID of the media control function entity 16 and the session ID information of the media delivery function entity 16;
  • Step S517 The media control function entity 16 to the media delivery function entity 16 requests RTSP PLAY (play) Or RTSP RECORD (request), requesting to play the content; wherein, selecting RTSP PLAY or RTSP RECORD is determined according to step S519.
  • Step S519 The media delivery function entity 16 returns an acknowledgement message (ACK) to the media control function entity 16, indicating that the playback is about to be performed.
  • Step S521 The media control function entity 16 returns an acknowledgement message (ACK) to the UE 11, indicating that the playback is about to be performed;
  • S523 The media delivery function entity 16 in the CDN node 1 sends an RTP stream to the UE 11 for playback or recording.
  • a content distribution network node is also provided.
  • FIG. 6 is a schematic structural diagram of a content distribution network node according to an embodiment of the present invention. As shown in FIG.
  • a content distribution network node includes a media control function entity 60 and at least one content delivery function entity 62.
  • the media control function entity 60 may include: a receiving module 600, a determining module 602, a selecting module 604, a querying module 606, and a sending module 608.
  • the receiving module 600 is configured to receive a service request sent by the service control function entity or the IPTV service control function entity, where the service request carries a content identifier, and is used to indicate that the content corresponding to the content identifier is requested;
  • the determining module 602 is connected to the receiving module 600, and is configured to determine whether the CDN node can provide the content service requested by the service request.
  • the selecting module 604 is connected to the determining module 602, and the result determined by the determining module 602 is yes.
  • the content delivery function entity 62 that provides the content service is selected;
  • the query module 606 is connected to the determination module 602, and is configured to send a query request to the CDN global controller if the result of the determination by the determination module 602 is negative.
  • the sending module 608 is connected to the query module 606, and configured to send a service request to the second CDN node acquired by the query module 606, requesting the second CDN node to provide the content service; a delivery function entity 62, connected to the media control function entity 60, for Household device providing the content service.
  • the service control function entity or the IPTV service control function entity sends the service request to the CDN node closest to the user equipment home zone, if the CDN node can provide the user equipment for the user equipment.
  • the content service requested by the device, the service control function entity or the IPTV service control function entity sends a service request message to the CDN node, requesting the CDN node to provide a content service for the user equipment.
  • the CDN global controller obtains the CDN node that can provide the content service, and sends the service request to the A CDN node that provides the above content services.
  • the technical solution provided by the present invention can solve the problem that the content positioning method in the prior art is effective, and can reduce the CDN processing delay without increasing the cost of the device.
  • the pressure of the CDN global controller can be alleviated, and the CDN global controller can be prevented from becoming a performance bottleneck, thereby ensuring the reliability of its work.

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Description

内容定位方法及内容分发网络节点
技术领域 本发明涉及移动通信技术领域,尤其涉及一种内容定位方法及内容分发 网络节点。 背景技术 交互式网络电视, 又称为互联网十办议电视 ( Internet Protocol Television , 筒称为 IPTV ),是指通过 IP承载网络向用户提供能够支持交互能力的电视节 目的直播、 点播和时移播放等业务的设备总称。 随着 IPTV的发展, IPTV的 用户数量不断增加, 对系统性能和可靠性等方面提出了更高的要求。 其中, 对于交互式网络的内容交付功能, 为了减少系统各个部分之间的交互, 要求 内容交互网络的内部模块功能职责的明晰, 要求内容分发及业务流程筒洁和 可靠。 目前, IPTV标准以下一代网络( Next Generation Network,筒称为 NGN ) IP多媒体子系统 ( IP Multimedia Subsystem, 筒称为 IMS ) 和 NGN 非 IMS 两种架构为主, 能为用户提供点播、 直播、 录像及一些新业务。
IPTV架构中内容分发网络 ( Content Delivery Network, 筒称为 CDN ) 在 IPTV系统中的月 务质量 ( Quality of Experience, 筒称为 QoE ) 保障方面 及系统稳定性等方面起着重要作用。 CDN内部各重要功能实体主要用于实现 内容定位技术、 调度及存储的功能。 目前, 对于内容定位技术, 内容定位和播放都需要通过 CDN主控制器 进行, 在大规模用户并发的情况下, CDN主控制器可能会造成处理延迟, 从 而影响系统的性能, 成为系统性能的瓶颈。 虽然通过增加 CDN主控制器组 成分布式的 CDN主控制器进行负荷分担的方式可以减少处理延迟, 但这种 方式增加了 CDN主控制器的复杂度及建设成本。 发明内容 有鉴于此, 本发明提供了一种改进的内容定位方案, 用以解决现有技术 中存在的处理延迟长、 成本高的问题。 根据本发明的一个方面, 提供一种内容定位方法。 根据本发明的内容定位方法包括: 第一内容分发网络 CDN节点接收来 自业务控制功能实体或 IPTV服务控制功能实体发送的业务请求, 其中, 该 业务请求中携带有内容标识符 , 用于指示请求与该内容标识符对应的内容; 如果第一 CDN节点不能够提供业务请求所请求的内容服务, 则第一 CDN节 点向 CDN全局控制器发送查询请求, 以获取能够提供业务请求所请求的内 容服务的第二 CDN节点的信息, 并请求第二 CDN节点提供内容服务。 才艮据本发明的另一个方面, 提供了另一种内容定位方法。 才艮据本发明的内容定位方法包括: 业务控制功能实体或 IPTV服务控制 功能实体接收来自用户设备的业务请求, 其中, 该业务请求中携带有用户设 备的地址信息和用户设备请求的内容的标识符; 业务控制功能实体或 IPTV 月 务控制功能实体根据地址信息 , 选择与用户设备归属的区域距离最近的
CDN节点; 业务控制功能实体或 IPTV服务控制功能实体向 CDN节点发送 业务请求消息 , 请求 CDN节点为用户设备提供内容服务。 才艮据本发明的又一个方面, 提供了一种内容分发网络节点。 才艮据本发明的内容分发网络节点包括:媒体控制功能实体和至少一个内 容交付功能实体。 其中, 媒体控制功能实体包括: 接收模块、 判断模块、 选 择模块、 查询模块和发送模块, 其中, 接收模块用于接收来自业务控制功能 实体或 IPTV服务控制功能实体发送的业务请求, 其中, 该业务请求中携带 有内容标识符 , 用于指示请求与内容标识符对应的内容; 判断模块用于判断 该内容分发网络节点是否能够提供业务请求所请求的内容服务; 选择模块用 于在判断模块判断的结果为是的情况下, 选择提供内容服务的内容交付功能 实体; 查询模块用于在判断模块判断的结果为否的情况下, 向 CDN全局控 制器发送查询请求, 获取能够提供内容服务的第二 CDN 节点; 发送模块用 于向查询模块获取的第二 CDN节点发送业务请求,请求第二 CDN节点提供 内容服务; 内容交付功能实体, 用于为用户设备提供内容服务。 通过本发明的上述至少一个方案 ,将业务请求发送至离用户设备最近的 CDN节点, 而不是发送给 CDN全局控制器, 该 CDN节点在接收到该业务 请求后 , 如果其不能为用户设备提供用户设备所请求的内容服务, 则向 CDN 全局控制器发送查询请求, 将业务请求转发到可以为用户设备提供上述内容 月 务的 CDN节点, 从而减轻了 CDN全局控制器的压力, 缩小 CDN处理延 迟, 同时既不会增加 CDN主控制器的复杂度, 也不会增加设备的成本。 本发明的其它特征和优点将在随后的说明书中阐述, 并且, 部分地从说 明书中变得显而易见, 或者通过实施本发明而了解。 本发明的目的和其他优 点可通过在所写的说明书、 权利要求书、 以及附图中所特别指出的结构来实 现和获得。 附图说明 此处所说明的附图用来提供对本发明的进一步理解 ,并且构成说明书的 一部分, 与本发明的实施例一起用于解释本发明 , 并不构成对本发明的限制。 在附图中: 图 1为根据本发明实施例的基于 NGN的 IPTV系统的结构示意图; 图 2为才艮据本发明实施例的一种内容定位方法的流程图; 图 3为才艮据本发明实施例的另一种内容定位方法的流程图; 图 4为实例一的流程图; 图 5为实例二的流程图; 图 6为才艮据本发明实施例的内容分发网络节点的结构示意图。 具体实施方式 功能相克述 从目前的 CDN建设原则看, 20 %的内容部署在离用户最近的 CDN节 点上, 但该 CDN节点可以提供 80 %的点播服务, 其余 20 %的点播服务的内 容部署在中心节点(通常中心节点保存 100 %的内容)。 并且, 边缘节点的故 障率非常底的情况, 实际上接近 80 %的点播服务可以不需要通过 CDN主控 制器进行全局重定向服务的。 因此, 本发明实施例针对内容定位和播放都需 要通过 CDN主控制器进行而导致处理延迟或者负荷过大导致故障的问题, 提供了一种改进的内容定位方案。 在本发明实施例中, 业务控制功能实体或 IPTV服务控制功能实体将业务请求发送到离用户设备归属区域最近的 CDN 节点, 该 CDN 节点在不能为用户设备提供该用户设备请求的内容服务时, 通过 CDN全局控制器获取能够提供该内容服务的 CDN节点,将业务请求发 送到能够提供上述内容服务的 CDN节点。 在不冲突的情况下, 本申请中的实施例及实施例中的特征可以相互组 合。 以下结合附图对本发明的优选实施例进行说明 , 应当理解 , 此处所描述 的优选实施例仅用于说明和解释本发明, 并不用于限定本发明。 为了便于理解本发明实施例提供的技术方案 ,在对本发明实施例提供的 技术方案进行说明之前,对本发明实施例应用的基于 NGN的 IPTV系统进行 介绍。 图 1为根据本发明实施例的基于 NGN的 IPTV系统的结构示意图。 如 图 1所示, 基于 NGN的 IPTV系统主要包括: 用户设备(User Equipment, 筒称为 UE ) 11、 业务控制功能 ( Service Control Function, 筒称 SCF, 如果 在 NGN中 IMS , 则为核心 IMS - core IMS ) 12、 IPTV月 务控制功能 ( IPTV Service Control Functions , 筒称为 IPTV SCF ) 13、 内容分发网络 ( Content Delivery Network , 筒称为 CDN ) 14。 其中, CDN 14进一步包括: 内容分发网络全局控制器, 该内容分发网 络全局控制器也可以称为 CDN控制功能 /内容分发与存储控制功能(Content Delivery Network (Global) Controller ), 或者称为 Content Delivery & Storage Control Functions /Content Delivery Network Control Functions/Content Distribution & Location Control Functions , ( 筒 称 为 CD&SCF/CDNCF/CD&LCF ) 15、媒体控制功能实体( Media Control Function 或 Content Control Function 或 Cluster Controller 或 Content Distribution &Delivery & Location Control Functions, 筒称为 MCF 或 CCF 或 CC 或 CD&D&LCF ) 16以及媒体交付功能实体( Media Delivery Function或 Content Delivery Function或 Content Delivery and Storage Function , 筒称为 MDF或 CDF或 CD&SF ) 17。 其中 CDN节点 (或者实例)( 1,2...n ) 包含 1个媒体 控制功能实体 16和多个媒体交付功能实体 17。 其中, CDN节点并不仅限上 述 CDN节点 1和 CDN节点 2 (图中所示), 可以为多个。 以下分别描述基于 NGN的 IPTV系统的各实体及接口。 UE 11 , 具体地, 可以为具有移动能力的手机、 固定网络的机顶盒、 实 现机顶盒功能的基于软件实现的软终端, 还包括家庭网关等功能实体。 UE 通过与用户交互, 可以实现如点播、 直播等 IPTV业务。
SCF 12, 与 UE 11相连接, 其作为 NGN业务控制层面的主要功能实体 的集合, 主要用于会话控制、 业务认证、 鉴权、 计费等。 在 IMS网络情况下, 该实体为 Core IMS。 Core IMS主要用于提供基于 SIP的会话控制机制, 对 IPTV终端用户进行认证、 鉴权, 请求资源接纳控制子系统进行资源分配等。 Core IMS通过与 IPTV终端、 IPTV应用功能实体及内容分发功能实体交互进 行 SIP会话, 完成安全、 服务质量(Quality of Service, 筒称为 QoS )、 计费、 漫游等功能。
IPTV SCF 13, 通过会话初始化十办议 ( Session Initiation Protocol, 筒称 为 SIP ) 与上述 SCF 12相连接, 用于在会话启动或者修改时提供业务鉴权, 其功能包括: 检查用户的信息、 查看用户是否能够合法使用选择的内容; 信 用限制和信用控制;为系统选择提供初步服务的 IPTV媒体控制功能实体 16, 其中, 该功能实体主要针对点播、 直播、 录像、 时移等 IPTV业务。 IPTV SCF 13在 IMS网络情况下为一个 IPTV SIP应用月 务器,其对应 Open IPTV Forum 标准组织中的 IPTV Control和 IPTV Application的集合 , 对应 ITU-T标准中 的 IPTV 应用功能 ( Application Functions ) 及应用支持功能 ( Application Support Functions ) 以及月 务支持功肯 ¾ ( Service Support Functions )。 CDN 14, 通过 Xc和 Xd接口与 UE相连接, 其中, 通过 Xc接口连接
UE用于对媒体流 RTSP进行控制 , 通过 Xd接口连接 UE用于对媒体流 RTP 进行传输和媒体下载 (可以采用 HTTP协议)。 接口 A1 , 主要用于 CDN全局控制器 15向 IPTV SCF 13返回其管理的
CDN各节点的状态信息, 例如, 是否提供服务。 C21/C22接口 (RTSP接口), 用户媒体控制功能实体 16通过该接口对 媒体交付功能实体 17进行媒体控制。
C11/C12接口 (控制接口), 该接口采用 SIP协议实现, CDN节点通过 该接口向 CDN全局控制器 15查询可以提供点播服务的其他 CDN节点信息; CDN节点也可以通过该接口向 CDN全局控制器 15上~¾各节点的^^务状态 信息等。 方法实施例 才艮据本发明实施例, 首先提供了一种内容定位方法。 图 2为才艮据本发明实施例的一种内容定位方法的流程图。 如图 2所示, 根据本发明实施例的内容定位方法包括以下步骤 (步骤 S201 -步骤 S203 ): 步骤 S201: CDN节点 1接收来自业务控制功能实体或 IPTV服务控制 功能实体发送的业务请求, 其中, 该业务请求中携带有内容标识符, 用于指 示请求与内容标识符对应的内容; 步骤 S203:如果所述 CDN节点 1不能够提供所述业务请求所请求的内 容服务, 则所述 CDN节点 1向 CDN全局控制器发送查询请求, 以获取能够 提供所述业务请求所请求的内容服务的 CDN节点 2的信息 , 并请求 CDN节 点 2提供所述内容服务。 以下进一步描述上述各处理的细节。
(一) 步骤 S201 在具体实施过程中 ,在 CDN节点 1在接收上述业务请求之前,步骤 S201 的处理的触发可以包括以下步骤: 步骤 1 , 业务控制功能实体或 IPTV服务控制功能实体接收用户设备发 送的业务请求 , 其中, 该业务请求中携带有用户设备的地址及内容标识符; 步骤 2 , 业务控制功能实体或 IPTV服务控制功能实体根据用户设备归 属的区域, 选择与用户设备最近的 CDN节点 1; 步骤 3 , 业务控制功能实体或 IPTV服务控制功能实体向 CDN节点 1 发送上述业务请求。 具体地, 上述业务请求包括但不限于以下至少之一: 点播请求、 网络录 像录制请求、 真视频点播请求。
(二) 步骤 S103 在具体实施过程中, 在 CDN节点 1在接收上述业务请求之后, 首先 判断其是否可以提供该业务请求所请求的内容服务, 具体地, CDN节点 1通 过以下方法判断其是否可以上述内容月 务: 步骤 1 , CDN节点 1 判断其内容交付功能实体中是否存在与上述内容 标识符对应的内容, 如果是 , 则继续步骤 2 , 否则, CDN节点 1确定其不能 提供上述内容服务; 步骤 2 , CDN节点 1 判断其内容交互实体当前提供的内容服务是否已 达到给定的阈值 (比如, 达到 80 % ), 如果是, 则确定 CDN节点 1不能提供 所请求的内容服务, 否则, 确定 CDN节点 1能够提供请求的内容服务。 通过上述步骤 1和步骤 2, 如果 CDN节点 1判断其不能提供业务请求 所请求的内容服务, 则 CDN节点 1向 CDN全局控制器发送查询请求, 以获 取能够提供该内容服务的 CDN节点的信息, CDN全局控制器接收到该查询 请求后, 查询可以提供上述内容服务的 CDN节点, 并向 CDN节点 1返回响 应信息, 该响应消息中携带有可以提供上述内容服务的 CDN 节点的信息。 具体地, CDN全局控制器可以向 CDN节点 1返回所有可以提供上述内容服 务的 CDN节点的列表信息, 也可以只向 CDN节点 1返回最优的 CDN节点 的信息, CDN节点 1根据 CDN全局控制器返回的节点信息, 获取能够提供 上述内容^^务的 CDN节点 2 (可以为最优的节点) 的信息。 在 CDN节点 1获取到 CDN节点 2的信息后 ,根据 CDN节点 2的信息 , 向 CDN节点 2发送业务请求,请求 CDN节点 2为用户设备提供上述内容服 务; 第二 CDN节点接收到该业务请求后, CDN节点 2中的第二媒体控制功 能实体与提供内容服务的第二媒体交付功能实体之间建立会话 (具体地, 该 会话为 RTSP会话), 将该会话的标识( RTSP Session ID )返回到 CDN节点 1 , CDN节点 1将该会话的标识返回到用户设备。 具体地, 在基于 NGN的 IPTV系统中 , CDN节点 2接收到上述业务请 求之后该方法还包括以下步骤: ( 1 ) CDN节点 2中的媒体控制功能实体才艮据其节点内部内容交付功能 实体的服务状态查询可服务的内容交付功能实体的 URL 地址信息, 并该内 容交付功能实体发送 RTSP描述消息 ( RTSP DESCRIBE ) 的请求, 该 RTSP 描述消息中描述了请求节目信息。 同时, 该请求的 URL 中还携带有用户设 备的用户信息和所请求节目的路径信息等。 ( 2 ) CDN节点 2中的媒体交付功能实体向媒体控制功能实体返回可提 供服务的媒体交付功能实体的节目描述信息, 包括内容大小、 名称、 播放时 间、 IP地址和端口等信息。 步骤( 1 )和步骤(2 ) 中的 RTSP描述消息为可选, 媒体控制功能实体 在选择的媒体交付功能实体中可以包含内容的描述信息。 ( 3 ) CDN节点 2中的媒体控制功能实体向 CDN节点 2中的媒体交付 功能实体发送 RTSP会话建立消息 , 请求建立媒体通道的会话连接。
( 4 ) CDN节点 2中的媒体交付功能实体向媒体控制功能实体返回可提 供月 务的媒体交付功能实体的会话连接 RTSP Session ID。 其中 , 在将上述会话的标识返回给所述用户设备之后 , 用户设备才艮据上 述会话的标识向所述 CDN节点 2发送播放请求, 请求播放所述内容标识对 应的内容。 优选地, 如果 CDN节点 1确定其能够提供所述内容服务, 则 CDN节 点 1 中的第一媒体控制功能实体与 CDN节点 1 中提供内容服务的第一媒体 交付功能实体之间建立会话 ( RTSP Session ), 将该会话的标识返回到用户设 备。 具体地 , 在将该会话的标识返回到用户设备之后 , 用户设备根据所述会 话的标识向 CDN节点 1发送播放请求, 请求播放上述内容标识对应的内容。 在具体实施过程中, CDN节点 1确定其能够提供上述内容服务情况下, 该方法可以包括以下步骤: ( 1 ) CDN节点 1中的媒体控制功能实体查询其节点内部其管理的可服 务的媒体交付功能实体的 URL 地址信息并向选中的媒体交付功能实体发送 建立会话的请求。 其中, 步骤( 1 )可以进一步包括以下: CDN节点 1 内的媒体控制功能 实体向媒体交付功能实体发送 RTSP DESCRIBE消息, 查询可以提供 务的 媒体交付功能实体的 SDP信息, 其中, RTSP DESCRIBE消息中携带有 URL 地址信息及媒体内容的描述信息; 媒体交付功能实体向媒体控制功能实体回 确认 ACK消息, 含 SDP信息; 媒体控制功能实体向媒体交付功能实体发起
RTSP SETUP消息, 用户建立和媒体交付功能实体的 RTSP会话链接; 媒体 交付功能实体向媒体控制功能实体返回内容交付会话建立的 ID , 即 RTSP Session ID。
( 2 )媒体控制功能实体将内容交付会话的 ID通过会话初始化响应返回 给用户设备。
( 3 ) 用户设备请求 CDN 1节点进行点播, CDN节点 1向用户设备提 供流服务。 其中 , 步骤 ( 3 ) 可以进一步包括: 媒体控制功能实体到媒体交付功能 实体请求 RTSP PLAY (播放 )或者 RTSP RECORD (录制), 请求播放内容; 媒体交付功能实体给媒体控制功能实体确认, 即将进行播放; 媒体控制功能 实体对用户设备进行确认, 即将进行播放; CDN节点 1中的媒体交付功能实 体向用户设备发送 RTP流进行播放或者录制。 根据本发明实施例的上述内容定位方法, 可以降低 CDN全局控制器的 负荷, 减少处理延迟。 根据本发明实施例 , 还提供了另一种内容定位方法。 图 3为才艮据本发明实施例的另一种内容定位方法的流程图。如图 3所示, 才艮据本发明实施例的另一种内容定位方法包括以下步骤 (步骤 S301-步骤 S305 ): 步骤 S301 :业务控制功能实体或 IPTV服务控制功能实体接收来自用户 设备的业务请求, 其中, 该业务请求中携带有用户设备的地址信息和用户设 备请求的内容的标识符; 步骤 S303:业务控制功能实体或 IPTV服务控制功能实体才艮据上述地址 信息 , 选择与用户设备归属的区域距离最近的 CDN节点; 步骤 S305: 业务控制功能实体或 IPTV服务控制功能实体向上述 CDN 节点发送业务请求消息 , 请求该 CDN节点为用户设备提供内容服务。 上述 CDN节点在接收到上述业务请求消息后 , 可以按照上述图 2所示 的方法进行内容定位。 才艮据本发明实施例提供的上述内容定位方法,可以将业务请求发送到离 用户设备最近的 CDN节点, 从而减少了处理延迟。 为进一步理解本发明实施例提供的技术方案的具体实施过程,以下通过 具体实施例进行说明。 实施例一 在本实施例中, 业务控制功能实体或 IPTV 服务控制功能实体选择的 CDN节点不能够提供用户设备所请求的内容服务,图 4为本实施例的流程图。 下面结合图 1对本实施例中对用户设备提供内容服务进行说明,如图 4所示, 该流程主要包括以下步骤: 步骤 S401 : 业务控制功能实体 12或者 13收到从 UE 11发送的会话初 始化 ( SIP INVITE ) 请求, 其中, 该请求的 SDP中包括 UE 11的 IP地址、 端口及内容标识符。 业务控制功能实体 12或者 13根据 UE 11归属的区域, 选择就近的 CDN节点提供服务, 本实施例中为 CDN节点 1 ; 并且, IPTV服务控制功能实体 13会定期检测内容分发网络 14正在提 供服务的状态, 选择尽量靠近并且没有故障的节点控制器 16; 步骤 S403: 接收到会话初始化( SIP INVITE )请求的 CDN节点 1的实 体 16判断 CDN节点 1是否能够提供媒体服务, 具体地, 判断依据包括但不 限于:
( 1 ) CDN节点 1所管理的媒体交付功能实体 16的服务状态是否达到 最大值 (例如 80 %正在^ ^务);
( 2 ) 请求的内容在该 CDN节点中不存在。 步骤 S405: 上述步骤中 CDN节点 1的媒体控制功能实体 16确定 CDN 节点 1 不能够提供媒体服务, 贝 d CDN节点 1 内的媒体控制功能实体 16向 CDN全局控制器 15发送 SIP OPTION消息,查询最优的可以提供服务的 CDN 节点, 该节点包含 IP地址和端口号(可才艮据该节点离 UE 11的远近及该节点 负荷等状态信息); 步骤 S407: CDN全局控制器 15查询可以提供服务的 CDN节点; 可以只返回最优的节点 ,也可以返回优先级别不同的多个可供选择的节 步骤 S409: CDN全局控制器 15向 CDN节点 1中的媒体控制功能实体 16返回查询的可提供 务的节点 (或节点列表 ) 信息; 步骤 S411 : CDN节点 1向其选择的 CDN节点 2中的媒体控制功能实 体 16发送 SIP INVITE消息 , 该消息包括 SIP Session ID信息 , 请求 CDN节 点 2提供业务请求的服务; 步骤 S413: CDN节点 2中的媒体控制功能实体 16查询其节点内部的 可服务的媒体交付功能实体 16的信息; 媒体控制功能实体 16并向选中的媒 体交付功能实体 16发送 RTSP DESCRIBE消息的请求,即选择要点播哪个节 目。 其中, 该请求的 URL中携带有用户信息和所点播节目的路径信息等; 步骤 S415: CDN节点 2中的媒体交付功能实体 16向媒体控制功能实 体 16通过响应消息( OK )返回可提供服务的媒体交付功能实体 16的节目描 述信息, 包括内容大小、 名称、 播放时间、 IP地址和端口等信息; 在具体实施过程中, 如果上述步骤 S405媒体控制功能实体 16选择的 CDN节点 1 内的可以提供服务的媒体交付功能实体 16中可能包^某体描述 信息时, 上述步骤 S413和步骤 S415可以省略。 步骤 S417: CDN节点 2中的媒体控制功能实体 16向媒体交付功能实 体 16发起 RTSP SETUP消息, 用户建立和 17的 RTSP会话链接; 步骤 S419: CDN节点 2中的媒体交付功能实体 16向媒体控制功能实 体 16通过响应消息( OK )返回内容交付会话建立的 ID,即 RTSP Session ID; 步骤 S421 : CDN节点 2中的媒体控制功能实体 16向 CDN节点 1中的 媒体控制功能实体 16通过响应消息返回内容交付会话的 ID即 SIP Session ID 和 RTSP Session ID; 步骤 S423: CDN节点 1 中的媒体控制功能实体 16将内容交付会话的 ID (即 RTSP Session ID和 SIP Session ID ) 进行绑定, 并将其结果通过会话 初始化响应返回给 UE 11。 其中,媒体控制功能实体 16 - >UE 11之间的会话 初始化响应过程可以采用现有的流程实现 , 具体不再赞述; 步骤 S425: UEUE 11向 CDN节点 2中的媒体控制功能实体 16请求 RTSP
PLAY (播放 ) 或者 RTSP RECORD (录制), 请求播放内容, 该请求中携带 媒体控制功能实体 16的 RTSP会话 ID和媒体交付功能实体 16的会话 ID信 息; 步骤 S427: CDN节点 2中的媒体控制功能实体 16向媒体交付功能实 体 16请求 RTSP PLAY (播放 )或者 RTSP RECORD (录制), 请求播放内容; 步骤 S429: CDN节点 2中的媒体交付功能实体 16返回媒体控制功能 实体 16确认信息 , 表示即将进行播放; 步骤 S431 : CDN节点 2中的媒体控制功能实体 16返回 UEUE 11确认 信息, 表示即将进行播放; 步骤 S433: CDN节点 2中的媒体交付功能实体 16向 UE 11发送 RTP 流进行播放或者录制。 实施例二 在本实施例中, 业务控制功能实体或 IPTV 服务控制功能实体选择的 CDN节点 1能够提供用户设备所请求的内容服务,图 5为本实施例的流程图。 下面结合图 1对本实施例中对用户设备提供内容服务进行说明,如图 5所示, 该流程主要包括以下步骤: 步骤 S501 :业务控制功能实体 12或者 IPTV服务控制功能实体 13接收 到从 UE 11发送的会话初始化 ( SIP INVITE ) 请求, 该请求的 SDP中包括 UE 11的 IP地址、端口及内容标识符。 IPTV服务控制功能实体 13才艮据 UE 11 归属的区域, 选择就近的 CDN节点提供服务, 在本实施例为 CDN节点; 具体地, IPTV服务控制功能实体 13会定期检测内容分发网络 14正在 提供服务的状态,以选择尽量靠近用户设备,并且没有故障的节点控制器 16; 步骤 S503: 收到会话初始化 ( SIP INVITE )请求的 CDN节点 1的媒体 控制功能实体 16判断自己是否能够提供媒体服务; 步骤 S505:上述步骤的判断结果为该 CDN节点 1中存在用户点播的内 容并可以接受点播, 则 CDN节点 1的媒体控制功能实体 16选择其节点内的 可以提供服务的媒体交付功能实体 16 , 媒体控制功能实体 16向选中的媒体 交付功能实体 16发送 RTSP DESCRIBE消息,查询可以提供服务的媒体交付 功能实体 16的 SDP信息, 含 URL地址信息; 步骤 S507: CDN节点 1 的媒体交付功能实体 16向媒体控制功能实体 16回确认 ACK消息 , 含 SDP信息; 其中, 步骤 S505和步骤 S507的 RTSP DESCRIBE查询消息可选, 步骤 S505 中的媒体控制功能实体 16选择其节点内的可以提供服务的媒体交付功 能实体 16中可能已经包含媒体描述信息。 步骤 S509: CDN节点 1 的媒体控制功能实体 16向媒体交付功能实体 16发起 RTSP SETUP消息, 用户建立和 17的 RTSP会话链接; 步骤 S511 : CDN节点 1 的媒体交付功能实体 16向媒体控制功能实体 16返回内容交付会话建立的 ID, 即 RTSP Session ID; 步骤 S513: CDN节点 1的媒体控制功能实体 16将内容交付会话的 ID 即 RTSP Session ID和 SIP Session ID进行绑定, 并^)夺其结果通过会话初始化 响应返回给 UE 11。媒体控制功能实体 16 - >UE 11之间的会话初始化响应过 程可以采用现有的流程, 具体不再赘述; 步骤 S515: UE 11到媒体控制功能实体 16请求 RTSP PLAY (播放)或 者 RTSP RECORD (录制), 请求播放内容, 该请求中携带媒体控制功能实体 16的 RTSP会话 ID和媒体交付功能实体 16的会话 ID信息; 步骤 S517: 媒体控制功能实体 16到媒体交付功能实体 16请求 RTSP PLAY (播放 ) 或者 RTSP RECORD (录制), 请求播放内容; 其中, 选择 RTSP PLAY或者 RTSP RECORD才艮据步骤 S519确定。 步骤 S519: 媒体交付功能实体 16向媒体控制功能实体 16返回确认信 息 ( ACK ), 表示即将进行播放; 步骤 S521 : 媒体控制功能实体 16向 UE 11返回确认信息 (ACK ), 表 示即将进行播放; 步骤 S523: CDN节点 1 中的媒体交付功能实体 16向 UE 11发送 RTP 流进行播放或者录制。 装置实施例 根据本发明实施例, 还提供了一种内容分发网络节点。 图 6 为根据本发明实施例的内容分发网络节点的结构示意图。 如图 6 所示, 根据本发明实施例的内容分发网络节点包括媒体控制功能实体 60 和 至少一个内容交付功能实体 62。 其中,该媒体控制功能实体 60可以包括:接收模块 600、判断模块 602、 选择模块 604、 查询模块 606以及发送模块 608。 其中, 接收模块 600, 用于 接收来自业务控制功能实体或 IPTV服务控制功能实体发送的业务请求 , 其 中, 该业务请求中携带有内容标识符, 用于指示请求与该内容标识符对应的 内容; 判断模块 602与接收模块 600相连接, 用于判断本 CDN节点是否能 够提供上述业务请求所请求的内容服务; 选择模块 604与判断模块 602相连 接, 用于在判断模块 602判断的结果为是的情况下, 选择提供内容服务的内 容交付功能实体 62; 查询模块 606与判断模块 602相连接, 用于在所述判断 模块 602判断的结果为否的情况下, 向 CDN全局控制器发送查询请求, 获 取能够提供上述内容服务的第二 CDN节点; 发送模块 608与查询模块 606 相连接, 用于向上述查询模块 606获取的第二 CDN节点发送业务请求, 请 求第二 CDN节点提供上述内容服务; 内容交付功能实体 62, 与媒体控制功能实体 60相连接, 用于为用户设 备提供所述内容服务。 如上所述, 借助本发明实施例提供的技术方案, 业务控制功能实体或 IPTV服务控制功能实体将业务请求发送到离用户设备归属区域最近的 CDN 节点, 如果该 CDN 节点能够为用户设备提供该用户设备请求的内容服务, 则业务控制功能实体或 IPTV服务控制功能实体向 CDN节点发送业务请求消 息, 请求该 CDN 节点为用户设备提供内容服务。 如果业务控制功能实体或 IPTV服务控制功能实体选择的 CDN节点不能为用户设备提供该用户设备请 求的内容服务, 则通过 CDN全局控制器获取能够提供该内容服务的 CDN节 点, 将业务请求发送到能够提供上述内容服务的 CDN 节点。 本发明提供的 技术方案可以解决现有技术中内容定位方法氐效的问题, 可以缩小 CDN处 理延迟, 同时也不会增加设备的成本。 并且, 可以减轻 CDN全局控制器的 压力, 防止 CDN全局控制器成为性能瓶颈, 保障其工作的可靠性。 以上所述仅为本发明的优选实施例而已, 并不用于限制本发明, 对于本 领域的技术人员来说, 本发明可以有各种更改和变化。 凡在本发明的 4青申和 原则之内, 所作的任何修改、 等同替换、 改进等, 均应包含在本发明的保护 范围之内。

Claims

权 利 要 求 书
1. 一种内容定位方法, 其特征在于, 包括:
第一内容分发网络 CDN 节点接收来自业务控制功能实体或 IPTV 服务控制功能实体发送的业务请求, 其中, 所述业务请求中携带有内容 标识符 , 用于指示请求与所述内容标识符对应的内容;
如果所述第一 CDN节点不能够提供所述业务请求所请求的内容服 务, 则所述第一 CDN节点向 CDN全局控制器发送查询请求, 以获取能 够提供所述业务请求所请求的内容服务的第二 CDN 节点的信息, 并请 求所述第二 CDN节点提供所述内容服务。
2. 根据权利要求 1 所述的方法, 其特征在于, 在所述第一 CDN节点接收 所述业务请求之前, 所述方法包括:
所述业务控制功能实体或 IPTV服务控制功能实体接收用户设备发 送的业务请求, 其中, 所述业务请求中携带有所述用户设备的地址及所 述内容标识符;
所述业务控制功能实体或 IPTV服务控制功能实体根据所述用户设 备归属的区域, 选择与所述用户设备最近的所述第一 CDN节点;
所述业务控制功能实体或 IPTV 服务控制功能实体向所述第一 CDN节点发送所述业务请求, 其中, 所述业务请求包括以下至少之一: 点播请求、 网络录像录制请求、 真视频点播请求。
3. 根据权利要求 1 所述的方法, 其特征在于, 在所述第一 CDN节点接收 所述业务请求之后 , 所述方法包括:
所述第一 CDN节点才艮据与所述内容标识符对应的内容在所述第一 CDN节点中是否存在、 和 /或第一 CDN节点的内容交互实体当前提供的 内容服务是否已达到给定的阈值来确定所述第一 CDN 节点是否能够提 供请求的所述内容月 务; 其中, 在判断结果均为是的情况下, 所述第一 CDN节点确定其能 够提供所述内容服务; 否则所述第一 CDN 节点确定其不能够提供所述 内容服务。
4. 根据权利要求 1 所述的方法, 其特征在于, 所述第一 CDN节点获取所 述第二 CDN节点的信息包括:
所述第一 CDN节点向 CDN全局控制器发送查询请求; 所述 CDN全局控制器向所述第一 CDN节点返回响应信息, 其中, 所述响应消息携带有所述第二 CDN节点的信息、 或包括所述第二 CDN 节点的多个能够提供请求的所述内容服务的 CDN节点的列表信息; 所述第一 CDN节点从所述响应消息中获取所述第二 CDN节点的 信息。
5. 根据权利要求 1 所述的方法, 其特征在于, 在所述第一 CDN节点请求 所述第二 CDN节点提供所述内容服务包括:
所述第一 CDN节点才艮据所述第二 CDN节点的信息, 向所述第二 CDN节点发送所述业务请求;
所述第二 CDN节点接收所述业务请求, 所述第二 CDN节点中的 第二媒体控制功能实体与所述第二 CDN 节点中提供所述内容服务的第 二媒体交付功能实体之间建立会话 , 将所述会话的标识返回到所述第一 CDN节点;
所述第一 CDN节点将所述会话的标识返回给所述用户设备。
6. 根据权利要求 5所述的方法, 其特征在于, 在将所述会话的标识返回给 所述用户设备之后, 所述方法还包括:
所述用户设备才艮据所述会话的标识向所述第二 CDN节点发送播放 请求, 请求播放所述内容标识对应的内容。
7. 根据权利要求 1 所述的方法, 其特征在于, 如果所述第一 CDN节点确 定其能够提供所述内容服务, 则所述方法还包括:
所述第一 CDN 节点中的第一媒体控制功能实体与所述第一 CDN 节点中提供所述内容服务的第一媒体交付功能实体之间建立会话 , 将所 述会话的标识返回到用户设备。
8. 根据权利要求 7所述的方法, 其特征在于, 在将所述会话的标识返回到 所述用户设备之后, 所述方法还包括:
所述用户设备才艮据所述会话的标识向所述第一 CDN节点发送播放 请求, 请求播放所述内容标识对应的内容。
9. 一种内容定位方法, 其特征在于, 包括:
业务控制功能实体或 IPTV服务控制功能实体接收来自用户设备的 业务请求, 其中, 所述业务请求中携带有所述用户设备的地址信息和所 述用户设备请求的内容的标识符;
所述业务控制功能实体或 IPTV 务控制功能实体才艮据所述地址信 息 , 选择与所述用户设备归属的区域距离最近的 CDN节点;
所述业务控制功能实体或 IPTV服务控制功能实体向 CDN节点发 送业务请求消息, 请求所述 CDN节点为所述用户设备提供内容服务。
10. 一种内容分发网络节点, 其特征在于, 包括: 媒体控制功能实体和至少 一个内容交付功能实体, 其中,
所述媒体控制功能实体, 包括:
接收模块 , 用于接收来自业务控制功能实体或 IPTV服务控制功能 实体发送的业务请求, 其中, 所述业务请求中携带有内容标识符, 用于 指示请求与所述内容标识符对应的内容;
判断模块,用于判断所述内容分发网络节点是否能够提供所述业务 请求所请求的内容服务;
选择模块 , 用于在所述判断模块判断的结果为是的情况下 , 选择提 供所述内容服务的内容交付功能实体;
查询模块,用于在所述判断模块判断的结果为否的情况下,向 CDN 全局控制器发送查询请求, 获取能够提供所述内容服务的第二 CDN 节 发送模块, 用于向所述查询模块获取的所述第二 CDN节点发送业 务请求, 请求所述第二 CDN节点提供所述内容服务;
所述内容交付功能实体, 用于为用户设备提供所述内容服务。
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