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WO2009092248A1 - 内容交付装置和系统、内容点播方法、及网络架构 - Google Patents

内容交付装置和系统、内容点播方法、及网络架构 Download PDF

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Publication number
WO2009092248A1
WO2009092248A1 PCT/CN2008/073618 CN2008073618W WO2009092248A1 WO 2009092248 A1 WO2009092248 A1 WO 2009092248A1 CN 2008073618 W CN2008073618 W CN 2008073618W WO 2009092248 A1 WO2009092248 A1 WO 2009092248A1
Authority
WO
WIPO (PCT)
Prior art keywords
content
content delivery
function entity
control function
service
Prior art date
Application number
PCT/CN2008/073618
Other languages
English (en)
French (fr)
Inventor
Hongfei Xia
Original Assignee
Zte Corporation
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 Zte Corporation filed Critical Zte Corporation
Priority to EP08871559.4A priority Critical patent/EP2234368B1/en
Priority to US12/812,230 priority patent/US20100287602A1/en
Publication of WO2009092248A1 publication Critical patent/WO2009092248A1/zh

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Classifications

    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L65/00Network arrangements, protocols or services for supporting real-time applications in data packet communication
    • H04L65/10Architectures or entities
    • H04L65/1016IP multimedia subsystem [IMS]
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L65/00Network arrangements, protocols or services for supporting real-time applications in data packet communication
    • H04L65/60Network streaming of media packets
    • H04L65/61Network streaming of media packets for supporting one-way streaming services, e.g. Internet radio
    • H04L65/612Network streaming of media packets for supporting one-way streaming services, e.g. Internet radio for unicast
    • 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
    • H04L67/56Provisioning of proxy 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
    • H04L67/56Provisioning of proxy services
    • H04L67/568Storing data temporarily at an intermediate stage, e.g. caching

Definitions

  • the present invention relates to the field of communications, and in particular, to a content delivery apparatus and system, a content on demand method, and a network architecture for a next generation network.
  • BACKGROUND OF THE INVENTION Currently, the International Telecommunications Union-Telecommunications Standardization Sector 4 (ITU-T) is the first stage of research on the Next Generation Network (NGN). determine.
  • NGN Next Generation Network
  • NGN also includes user layer, transport layer, service control layer and application layer.
  • the IP Multimedia System is a collection of the main functional entities of the service control layer.
  • the system is based on the Session Initiation Protocol (SIP) and has been considered as the next generation network convergence.
  • SIP Session Initiation Protocol
  • IMS can implement registration, authentication, authentication, and quality of service (QoS) management and assurance of users and terminal devices.
  • QoS quality of service
  • IMS supports multiple user access technologies and supports user mobility management. Support interoperability with other legacy networks or next-generation networks, as well as support for business convergence.
  • the interactive network television interactive network television also known as the Internet Protocol Television (IPTV), refers to the live broadcast, on-demand, and time of the television program capable of supporting the interactive capability through the IP bearer network.
  • IPTV Internet Protocol Television
  • the general term for mobile services such as mobile broadcasting.
  • IPTV transmits TV signals through the Internet Protocol through the Asymmetric Digital Subscriber Line (ADSL) or Ethernet access broadband network through the telecom channel, and sets the Top Box (STB for short).
  • ADSL Asymmetric Digital Subscriber Line
  • STB Top Box
  • ITU-T and TISPAN organizations are researching the integration of NGN and IPTV, and its current research is still in the stage of initial architecture discussion. How to realize the true integration of IPTV with NGN and how to communicate in the next generation communication network The unified service is provided in the middle, and no specific solution is given. Therefore, the operator cannot perform unified service operation and management for the IPTV service, and the operation and management cost of the IPTV is relatively high.
  • the present invention has been made in view of the need in the related art for a technology to solve the problem of how IPTV can truly integrate with NGN and how to provide a unified service in the next communication network.
  • the main purpose of the present invention is to provide a next-generation network content delivery solution to solve at least one of the above problems of the related art.
  • a content delivery apparatus for implementing a content delivery function in a next generation network, the content delivery apparatus being located in a service house above the transmission house, connected to the service control function entity and the transmission function Between entities, used to deliver content from application function modules in next-generation networks to end users.
  • the content delivery device is further configured to distribute, cache, or store content from the application function module.
  • the apparatus further includes: a content delivery control function module for controlling operation of the content delivery and storage function module; a plurality of content delivery and storage function modules for buffering or storing the application function module under the control of the content delivery control function module Content, as well as delivering cached or stored content to end users.
  • the content delivery control function module further includes: a distribution control function entity, configured to establish a file or stream based content distribution policy, manage distribution of content between the plurality of content delivery and storage function modules, and utilize a location control function entity Information to optimize the content distribution policy; a location control function entity for identifying content delivery and storage function modules according to predetermined conditions, the module being capable of delivering the content to the end user's optimal location information.
  • the predetermined condition includes at least one of: distribution information of the content delivery and storage function module, load status of the content delivery and storage function, location information of the terminal user, and processing capability information of the end user.
  • the content delivery and storage function module further includes: a delivery function entity for The content to be delivered is sent to the end user, and is used to upload content to the content delivery and storage function module, or to download content from at least one content delivery and storage function module; a distribution function entity for use between the content delivery and storage function entity Distribute content, and process media control messages from end users or business control function entities; cache and store functional entities for caching or storing distributed content.
  • the media control message is used to notify the content delivery and storage function module to perform at least one of the following operations: play, pause, fast forward, rewind.
  • the foregoing content is content that is prepared for processing, and the preparation process includes at least one of the following: content aggregation, content management, content processing, metadata processing, content encryption, and the foregoing preparation processing may be performed by an application function module, or may be performed by Execution by an external third party outside the next generation network.
  • a content on demand method is provided for a next generation network including an end user, a service control function entity, and the content delivery apparatus described above.
  • the method includes: Step S302, the terminal user initiates an on-demand request to play the corresponding content; Step S304, the content delivery device acquires the URL information of the content, and returns the URL information to the service control function entity; and in step S306, the service control function entity requests the allocation Network resource, in the case where the network resource is successfully allocated, the content delivery device plays the content to the terminal user.
  • the next generation network further includes an application function module
  • the step S302 may further include: the terminal user sending the on-demand request to the service control function entity, where the on-demand request carries the user information of the terminal user; and the service control function entity is configured according to the request in the request
  • the user information authenticates the terminal user, and sends a request message for acquiring the playback URL information to the content delivery device via the application function module if the authentication is passed.
  • the content delivery device acquires the URL information in response to the request message for acquiring the playback URL information.
  • the next generation network further includes a resource admission function entity, wherein, in step S306, the service control function entity requests the resource admission function entity to allocate the network resource.
  • a content delivery system includes: a service control function entity, located at the service layer, connected to the content delivery device and the end user, and configured to send the content request to the content delivery device after the end user initiates the on-demand request to play the corresponding content.
  • a service control function entity located at the service layer, connected to the content delivery device and the end user, and configured to send the content request to the content delivery device after the end user initiates the on-demand request to play the corresponding content.
  • Sending a request for obtaining the URL information of the content requesting the network resource after acquiring the URL information, and transmitting the obtained URL information to the terminal user after the network resource is successfully allocated
  • the content delivery device is located at the service layer, and is configured to respond to the content acquisition
  • the request for the URL information sends the URL information to the service control function entity, and plays the content to the terminal user after the end user receives the URL information.
  • the service control function entity is further configured to authenticate the terminal user according to the user information of the terminal user carried in the on-demand request, and send a request for acquiring the URL information of the content to the content delivery device if the authentication is passed.
  • the system further includes a resource admission control function entity, located at the transport layer, configured to allocate network resources when the service control function entity requests to allocate network resources, and notify the service control function entity of the network resource allocation result.
  • the system further includes an application support function entity and a service support function entity, where the application support function entity and the service support function entity are located in the service house, where the application function module is included, wherein the application function module is connected to the service control function entity, And for forwarding the request for the URL information of the acquired content from the service control function entity to the content delivery device, and forwarding the URL information from the content delivery device to the service control function entity.
  • a network architecture in a next generation network is provided, where the network architecture includes: a transport layer; a service house; wherein the service layer further includes the content interaction function device, and the content interaction function device To realize the transmission of information between the transmission house and an end user.
  • FIG. 1 is a block diagram of a next generation network after adding a content delivery device according to an embodiment of the apparatus of the present invention
  • 2 is a block diagram of a content delivery apparatus according to an embodiment of the apparatus of the present invention
  • FIG. 3 is a detailed block diagram of a content delivery apparatus according to an embodiment of the apparatus of the present invention
  • FIG. 4 is a content of an embodiment of the method according to the present invention.
  • FIG. 5 is a signaling flow diagram of a detailed processing procedure of a content on demand method according to an embodiment of the method of the present invention
  • FIG. 6 is a block diagram of a content delivery system according to an embodiment of the system of the present invention
  • DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS In the embodiment of the present invention, a content delivery device is added on the basis of the existing NGN architecture.
  • NGN IMS next-generation network architecture
  • the content delivery functions are added to the service layer of the existing NGN network architecture, so that the end user can implement the roaming and nomadic functions, thereby improving The core competitiveness of the IPTV system.
  • a content delivery apparatus (also referred to as a Content Delivery Function (CDF) entity) for implementing a content delivery function in an NGN, as shown in FIG.
  • the content delivery device can be located in a Service Stratum located above the Transport Stratum, and connected between a Service Control Function entity and a Transport Function entity.
  • the content of the application function module from the NGN is delivered to the end user.
  • the end user here can also be called the End-User Functions (EU).
  • EU End-User Functions
  • the location of the end user in the NGN is shown in Figure 1.
  • the content delivery apparatus will be described in detail below in conjunction with the NGN architecture diagram shown in FIG.
  • the NGN includes a transport layer and a service layer, where the service layer includes an application support function entity and a service support function entity, a Service Control Functions entity (module), and a content delivery device;
  • the transmission house includes a transmission control function entity and a transmission The function entity, wherein the transmission control function entity includes a network attachment control function entity and a resource admission control function entity (RACF), and the system may further include a management function entity.
  • the functions of each entity/device are described below.
  • the content delivery device according to the present embodiment is added to the service layer in the existing NGN architecture, which is under the service control function layer in the service roof and is above the transport layer.
  • the terminal user may be any type of multimedia terminal, and the terminal user may be an IPTV terminal function, and the IPTV terminal function may be a set top box implemented by hardware, or may be implemented by software with IPTV. Terminal equipment for set-top box functions.
  • the Service Control Functions entity module mainly refers to the Core IMS functional entity in the IPTV system of the NGN IMS network architecture, and the functional entity provides a session control mechanism to provide authentication, authentication, and request of the terminal user.
  • the resource admission control function entity performs resource allocation work.
  • the service control function entity also interacts with an end user, an application support function entity, an application support function entity (Application Support Function & Service Support Function), and a content distribution function to perform a session description protocol session to complete security and QoS.
  • the functions of the application support function entity and the service support function entity are connected to the application through an application network interface (ANI), and the service control function entity further includes service user information.
  • the resource admission control function entity is used for resource allocation work, and can also be used to interact with an end user, an application support function entity, a service support function entity, and a content distribution function to perform a session description protocol session to complete security and quality of service ( QoS), billing, roaming and more.
  • NGN can be connected to other networks through a network interface (NNI).
  • the NGN may further include Application Functions (abbreviated as AS) (module) (for example, when it is specific to the IPTV service, which may be an IPTV application function), and the application function may be located in FIG. 1
  • AS Application Functions
  • module for example, when it is specific to the IPTV service, which may be an IPTV application function
  • the application function may be located in FIG. 1
  • the sub-functions of the application support function entity and the internal functions of the service support function entity are used for the terminal user to select and purchase content, process the request from the end user to perform application authentication and execute application logic (on-demand, live broadcast, etc., application selection) And so on, processing content metadata and the like.
  • the application function can communicate with the content delivery and storage module to process the address information of the selected content delivery and storage module from the service control. request.
  • the content delivery device is used to distribute, cache or store content from the application function module.
  • the content from the application function module may be content that is prepared for processing.
  • the preparation process may include at least one of the following: content aggregation, content management, content processing, metadata processing, content encryption.
  • the content preparation processing may be completed in the application function module in the NGN, or may be completed by a third party other than the NGN, that is, the content from the application function module may be the content saved locally by the application function module, or It is content that is sent (distributed) via the application function module after being prepared by the third party from outside the NGN.
  • the content delivery apparatus includes: a content delivery control function module 10 for controlling the operation of the content delivery and storage function module 20.
  • the content delivery and storage function module 20 may be plural or multiple, for buffering or storing the content distributed by the application function module under the control of the content delivery control function module 10, and the content to be cached or stored. Delivered to the end user, the structure of the device is shown in the figure
  • FIG. 3 is a block diagram showing a preferred structure of a content delivery apparatus according to an embodiment of the present invention.
  • the content delivery control function module 10 may include a distribution control function entity 102 and a location.
  • the control function entity 104, the content delivery and storage function module 20 can include a delivery function entity 202 and a distribution function entity 204.
  • a distribution control function entity 102 for establishing a file or stream based distribution policy, managing distribution of content between the plurality of content delivery and storage function modules, and utilizing information of the location control function entity 104 to optimize the content distribution policy;
  • the functional entity 104 is configured to identify the content delivery and storage function module 20 having the best location information capable of delivering the content to the end user according to predetermined conditions.
  • the predetermined condition includes at least one of the following: distribution information of the content delivery and storage function module, load status of the content delivery and storage function, location information of the terminal user, and processing capability information of the terminal user; the media control message is used to notify the content delivery Perform at least one of the following operations with the storage function module: play, pause, fast forward, rewind.
  • a delivery function entity 202 for transmitting (delivering) the content to be delivered to the end user, and for uploading and downloading the terminal user, that is, transferring the content that the end user needs to transmit to the content delivery device (content delivery function entity)
  • the delivery functional entity 202 is for the terminal
  • the user uploads or downloads content to the at least one content interaction and storage function module 20;
  • the distribution function entity 204 is configured to distribute (forward) the content between the content delivery and storage function module 20 and the terminal user or the service control function entity.
  • the media control message is processed;
  • the cache and storage function entity 206 is coupled to the distribution function entity 204 for caching or storing the distributed content.
  • FIG. 4 shows a flow of a content on-demand method according to an embodiment of the present invention.
  • the method includes: Step S402: An end user initiates an on-demand request to play a corresponding content; Step S404, the content delivery device acquires a URL of the content. Information, and returning the URL information to the service control function; and step S406, the terminal user requests to allocate the network resource, and in the case that the network resource is successfully allocated, the service control function entity returns the content URL information to the terminal user, and the content delivery device to the terminal The user plays the content.
  • the NGN further includes an application function module. Accordingly, the step S402 may further include: the terminal user sending the on-demand request to the service control function entity, where the on-demand request carries the user information of the terminal user; the service control function entity is requested according to the on-demand
  • the user information is authenticated by the user information, and in the case that the authentication is passed, the request message for acquiring the play URL information is sent to the content delivery device via the support function entity and the service support function entity, and correspondingly, in step S404.
  • the content delivery device acquires the URL information in response to the request message for acquiring the playback URL information.
  • the NGN further includes a resource admission function entity, and accordingly, in step S406, the service control function entity requests the resource admission function entity to allocate the network resource.
  • Step 502 The terminal user (EU) sends an on-demand request to the service control function entity (SCF).
  • SCF service control function entity
  • Step 504 The service control function entity receives the above-mentioned request for on-demand, and authenticates and authenticates the user according to the user information of the terminal carried in the request for the terminal.
  • the service control function entity applies the function module to the IPTV ( AS) a request message for sending an on-demand URL;
  • CDF content delivery module
  • Step 508 The content delivery control module selects an appropriate content delivery according to the distribution policy (for example, the content delivery and the state of the load in the storage module, etc.)
  • the storage function provides a service) selecting an appropriate content delivery and storage function (acquiring URL information), and allocating local resources in the content delivery and storage function;
  • Step 510 a content delivery function entity (CDF, ie, the content delivery device described above) Returning the URL information of the media server providing the on-demand channel service to the AS;
  • Step 512 the IPTV application function returns the URL information of the media server providing the on-demand program monthly service to the service control function entity (SCF);
  • SCF service control function entity
  • Step 514 the SCF to the resource Admission Control Function Entity (RACF) requests to allocate network resource information
  • Step 516 the RACF module allocates network resource information; Step 518, the RACF module returns the allocated network resource information to the SCF; Step 520, the SCF returns the URL address of the media server that provides the on-demand program service to the ITF; Step 522, ITF and SCF, CDF Wait for the interaction to establish an RTSP link to provide an on-demand streaming service for the ITF.
  • the live broadcast process of the IPTV program is similar to the on-demand process of the IPTV program described above, and the description thereof will not be repeated here.
  • a content delivery system is provided, which may be located in the NGN architecture shown in FIG. 6 is a structural block diagram of a content delivery system according to an embodiment of the present invention.
  • the content delivery system includes a service control function entity and a content delivery device.
  • the service control function entity 60 is located in the service house and is connected to the content delivery device 70 and the terminal user, and is configured to send the content request to the content delivery device after the terminal user initiates the on-demand request and plays the corresponding content.
  • the request for the URL information of the corresponding content is requested after the URL information is obtained, and after the network resource is successfully allocated, the obtained URL information is sent to the terminal user.
  • the content delivery device 70 is located at the service layer, and is configured to respond to the request for acquiring the URL information of the corresponding content, and send the URL information to the service control function entity, and play the corresponding content to the terminal user after the terminal user receives the URL information.
  • FIG. 7 is a block diagram showing a preferred structure of a content delivery apparatus according to an embodiment of the present invention.
  • the content delivery system further includes a resource admission control function entity 80 and an application.
  • the functional entity and the business support functional entity 90 are supported.
  • the resource admission control function entity 80 is located at the transport layer, and is configured to allocate network resources when the service control function entity requests to allocate network resources, and notify the service control function entity of the network resource allocation result.
  • the application support function entity and the service support function entity 90 are located at the service layer, and include an application function module 902.
  • the application function module 902 can be connected to the service control function entity 60 for using the URL information of the content obtained from the service control function entity.
  • the request is forwarded to the content delivery device, and the URL information from the content delivery device 70 is forwarded to the service control function entity 60.
  • a network architecture in an NGN is provided, where the network architecture includes: a transport layer; a service layer; wherein, the service layer further includes the content interaction function device, and the content interaction function device is used to implement Transmission of information between the transmission house and an end user.
  • the invention improves the architecture of the NGN, that is, increases the content delivery device (functional entity), and truly realizes the integration of the multimedia service such as IPTV in the NGN network, and provides the on-demand method of the IPTV service after the convergence.
  • the present invention can be used not only for merging IPTV services in an NGN network, but also for various other services. Therefore, it is possible to facilitate the development of various services in NGN and fill the gaps in related technologies.
  • the present invention fully integrates the interactive network television system into the NGN architecture (NGN IMS or NGN non-IMS), and adds content delivery functions to the service layer of the existing NGN network architecture.
  • Retrofitting, IPTV based on the architecture can realize the transformation of the NGN network, and the end users can realize the roaming and nomadic functions, which enhances the core competitiveness of the IPTV system.
  • the above is only the preferred embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes can be made to the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and scope of the present invention are intended to be included within the scope of the present invention.

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  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Data Exchanges In Wide-Area Networks (AREA)
  • Information Transfer Between Computers (AREA)
  • Mobile Radio Communication Systems (AREA)

Description

内容交付装置和系统、 内容点播方法、
及网络架构
技术领域 本发明涉及通信领域, 并且特别地, 涉及用于下一代网络的内容交付装 置和系统、 内容点播方法、 及网络架构。 背景技术 目前, 国际电信联盟电信标准 4 ( International Telecommunications Union-Telecommunications standardization sector, 简称为 ITU-T )对于下一代 通信网络 ( Next Generation Network, 简称为 NGN ) 第一阶段的研究才匡架结 构已经基本确定。 除了管理层外, NGN还包括用户层、 传送层、 业务控制层 和应用层等。
IP多媒体子系统
IP多媒体子系统 ( IP Multimedia System, 简称为 IMS ) 是业务控制层 主要功能实体的集合, 该系统基于会话初始十办议 ( Session Initiation Protocol, 简称为 SIP ), 已经被认为是下一代网络融合的主要技术和体系架构。 其中, 通过 IMS可以实现用户和终端设备的注册、 认证、 鉴权、 服务质量(Quality of Service , 简称为 Qos ) 管理与保证; 同时, IMS支持多种用户接入技术, 支持用户移动性管理, 支持与其它传统网络或下一代网络的互通, 以及支持 业务的融合。 交互式网络电视 交互式网络电视, 又称为互联网十办议电视 ( Internet Protocol Television , 简称为 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总称。 IPTV通过电信通道, 利用不对 称数字用户线 ( Asymmetric Digital Subscriber Line , 简称为 ADSL ) 或以太 网接入宽带网,通过互联网协议来传送电视信号,以电视机加机顶盒( Set Top Box , 简称为 STB ) 为主要终端, 提供包括电视节目在内的多种数字媒体服 务。 目前只有 ITU-T和 TISPAN组织研究基于 NGN与 IPTV的融合, 而且 其目前的研究尚处于初级架构讨论阶段, 目前的技术方案中对于 IPTV如何 实现与 NGN真正的融合, 以及如何在下一代通信网络中提供统一的业务, 并没有给出具体的解决方案, 因此, 运营商不能够对 IPTV业务进行统一的 业务运营和管理, 而且 IPTV的运营管理成本较高。 发明内容 考虑到相关技术中存在的需要一种技术来解决 IPTV如何实现与 NGN 真正的融合, 以及如何在下一 4弋通信网络中提供统一的业务的问题而故出本 发明, 为此, 本发明的主要目的在于提供一种用于下一代网络内容交付方案, 以解决相关技术上述问题至少之一。 根据本发明的实施例, 提供了一种内容交付装置, 用于在下一代网络中 实现内容交付功能, 该内容交付装置位于传输屋之上的业务屋中, 连接于业 务控制功能实体和传输功能实体之间, 用于将来自下一代网络中的应用功能 模块的内容交付到终端用户。 并且, 内容交付装置还用于将来自应用功能模块的内容进行分发、緩存 或存储。 该装置进一步包括: 内容交付控制功能模块, 用于控制内容交付与存储 功能模块的操作; 多个内容交付与存储功能模块, 用于在内容交付控制功能 模块的控制下緩存或存储来自应用功能模块的内容, 以及将緩存或存储的内 容交付到终端用户。 其中, 内容交付控制功能模块进一步包括: 分发控制功能实体, 用于建 立基于文件或流的内容分发策略, 管理多个内容交付与存储功能模块之间的 内容的分发, 以及利用位置控制功能实体的信息来优化内容分发策略; 位置 控制功能实体, 用于根据预定条件识别内容交付与存储功能模块, 该模块能 够将内容交付到终端用户的最佳位置信息。 其中, 预定条件至少包括其中的一项: 内容交付与存储功能模块的分布 信息、 内容交付与存储功能的负载状态、 终端用户的位置信息、 终端用户的 处理能力信息。 此外, 内容交付与存储功能模块进一步包括: 交付功能实体, 用于将需 要交付的内容发送给终端用户, 以及用于向内容交付与存储功能模块上传内 容, 或从至少一个内容交付与存储功能模块下载内容; 分发功能实体, 用于 在内容交付与存储功能实体之间分发内容, 以及处理来自终端用户或者业务 控制功能实体的媒体控制消息; 緩存和存储功能实体, 用于緩存或存储分发 的内容。 其中,媒体控制消息用于通知内容交付与存储功能模块执行以下操作中 的至少之一: 播放、 暂停、 快进、 快退。 此外,上述的内容是经过准备处理的内容,准备处理包括以下至少之一: 内容聚合、 内容管理、 内容处理、 元数据处理、 内容加密, 并且上述准备处 理可以由应用功能模块执行, 也可以由下一代网络之外的外部第三方执行。 才艮据本发明的另一实施例,提供了一种内容点播方法,用于下一代网络, 下一代网络包括终端用户、 业务控制功能实体、 以及上述的内容交付装置。 该方法包括: 步骤 S302 , 终端用户发起点播请求以播放相应内容; 步骤 S304, 内容交付装置获取内容的 URL信息, 并将 URL信息返回给业务控制功 能实体; 以及步骤 S306, 业务控制功能实体请求分配网络资源, 在网络资源成 功分配的情况下, 内容交付装置对终端用户播放内容。 其中, 下一代网络进一步包括应用功能模块, 步骤 S302可进一步包括: 终端用户将点播请求发送至业务控制功能实体, 其中, 点播请求中携带终端用 户的用户信息; 业务控制功能实体根据点播请求中的用户信息对终端用户进行 鉴权, 并在鉴权通过的情况下将获取播放 URL信息的请求消息经由应用功能 模块发送至内容交付装置。 另夕卜, 在步骤 S304 中, 内容交付装置响应于获取播放 URL信息的请求 消息来获取 URL信息。 除此之外, 下一代网络进一步包括资源准入功能实体, 其特征在于, 在步 骤 S306中, 业务控制功能实体向资源准入功能实体请求分配网络资源。 才艮据本发明的再一个实施例, 提供了一种内容交付系统。 该系统包括: 业务控制功能实体, 位于业务层, 与内容交付装置和终端用 户相连, 用于在终端用户发起点播请求以播放相应内容后, 向内容交付装置发 送获取内容的 URL信息的请求, 在获取 URL信息后请求网络资源, 并在网络 资源成功分配之后将获取的 URL信息发送至终端用户; 内容交付装置, 位于业务层, 用于响应于获取内容的 URL信息的请求将 URL信息发送给业务控制功能实体, 以及在终端用户收到 URL信息之后对终 端用户播放内容。 其中,业务控制功能实体还用于根据点播请求中携带的终端用户的用户信 息对终端用户进行鉴权, 并在鉴权通过的情况下向内容交付装置发送获取内容 的 URL信息的请求。 另外, 该系统进一步包括资源准入控制功能实体, 位于传输层, 用于在业 务控制功能实体请求分配网络资源的情况下分配网络资源, 并将网络资源的分 配结果告知业务控制功能实体。 除此之外, 该系统进一步包括应用支持功能实体与业务支持功能实体,应 用支持功能实体与业务支持功能实体位于业务屋, 其中包含应用功能模块, 其 中, 应用功能模块与业务控制功能实体连接, 并且用于将来自业务控制功能实 体的获取内容的 URL信息的请求转发至内容交付装置, 以及将来自内容交付 装置的 URL信息转发至业务控制功能实体。 根据本发明的再一个实施例,提供了一种下一代网络中的网络架构, 该网 络架构包括: 传输层; 业务屋; 其中, 业务层进一步包括上述的内容交互功能 装置, 内容交互功能装置用于实现传输屋与一终端用户之间的信息传输。 通过本发明的上述技术方案, 能够将 IPTV等多种业务系统融合到下一代 网络中, 便利了下一代网络中多种多媒体业务的开展, 填补了相关技术中的空 缺。 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, 构成本申请的一部 分, 本发明的示意性实施例及其说明用于解释本发明, 并不构成对本发明的不 当限定。 在附图中: 图 1 是才艮据本发明装置实施例的增加了内容交付装置后下一代网络的框 图; 图 2是才艮据本发明装置实施例的内容交付装置的框图; 图 3是才艮据本发明装置实施例的内容交付装置的具体框图; 图 4是才艮据本发明方法实施例的内容点播方法的流程图; 图 5 是根据本发明方法实施例的内容点播方法的详细处理过程的信令流 程图; 图 6是才艮据本发明系统实施例的内容交付系统的框图; 图 7是才艮据本发明系统实施例的内容交付系统的具体框图。 具体实施方式 功能相无述 在本发明实施例中, 在现有的 NGN架构的基础上, 增加了内容交付装置
(功能实体), 实现了在 NGN网络中融合 IPTV等多媒体业务, 并提供融合后 的 IPTV业务的点播方法, 通过将交互式网络电视系统完全融合到下一代网络 架构 ( NGN IMS或者 NGN non-IMS ) 中, 对现有的 NGN网络架构进行改造, 具体地, 在现有的 NGN 网络架构的业务层中加入内容交付功能 ( Content Delivery Functions ), 这样, 终端用户可以实现漫游和游牧功能, 提升了 IPTV 系统的核心竟争力。 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。 装置实施例 在本实施例中, 提供了一种内容交付装置 (也可称为内容交付功能 ( Content Delivery Function, 简称为 CDF ) 实体 ), 用于在 NGN中实现内容交 付功能,如图 1所示,该内容交付装置可以处在位于传输层( Transport Stratum ) 之上的业务居 ( Service Stratum ) 中, 连接于业务控制功能 ( Service Control Function ) 实体和传输功能 ( Transport Function ) 实体之间, 用于 ^!夸来自 NGN 中的应用功能模块的内容交付到终端用户, 这里的终端用户也可以称为终端用 户功能实体 ( End-User Functions , 简称为 EU ) , 其中, 终端用户在 NGN中的 位置如图 1所示, 下面结合图 1所示的 NGN架构 图对该内容交付装置进行 详细描述。 该 NGN包括传输层和业务层, 其中, 业务层包括应用支持功能实体与业 务支持功能实体、 业务控制功能 ( Service Control Functions ) 实体(模块)、 内 容交付装置; 传输屋包括传输控制功能实体和传输功能实体, 其中, 传输控制 功能实体中包括网络附着控制功能实体和资源准入控制功能实体( RACF ) , 另 外, 该系统还可以包括管理功能实体, 下面对各实体 /装置的功能进行说明。 将根据本实施例的内容交付装置加入到现有的 NGN架构中的业务层中, 该装置处于业务屋面中业务控制功能层的下面, 并处于传输层之上。 另外, 在 NGN 系统中, 终端用户可以是任意一种多媒体终端, 例 口, 该终端用户可以 是 IPTV终端功能, 该 IPTV终端功能可以是通过硬件实现的机顶盒, 也可以 是用软件实现的具有 IPTV机顶盒功能的终端设备。 其中,业务控制功能( Service Control Functions )实体 (模块 )在 NGN IMS 网络架构的 IPTV系统中主要是指 Core IMS功能实体,该功能实体提供会话控 制机制, 提供终端用户的认证、 鉴权、 以及请求资源准入控制功能实体进行资 源分配工作。 另外, 该业务控制功能实体 (模块)还与终端用户、 应用支持功 能实体、 业务支持功能实体 ( Application Support Function & Service Support Function ) 及内容分发功能交互, 以进行会话描述协议会话, 完成安全、 QoS、 计费、 漫游等功能, 应用支持功能实体与业务支持功能实体通过应用网络接口 (ANI )与应用 相连接, 该业务控制功能实体还包括业务用户信息。 资源准入控制功能实体用于进行资源分配工作, 也可以用于与终端用户、 应用支持功能实体、 业务支持功能实体、 以及内容分发功能交互, 以进行会话 描述协议会话, 完成安全、 服务质量 (QoS )、 计费、 漫游等功能。
NGN可以通过网络接口 (NNI ) 与其它网络相连接。 另夕卜, 该 NGN还可以包括应用功能( Applications Functions , 简称为 AS ) (模块)(例如, 具体到 IPTV业务时, 其可以是 IPTV应用功能), 该应用功 能可以位于图 1中所示的应用支持功能实体与业务支持功能实体内部功能的子 功能中, 用于终端用户进行选择和购买内容、 处理来自终端用户的请求进行应 用的鉴权和执行应用逻辑 (点播、 直播等应用、 应用选择等)、 处理内容元数 据等信息, 具体地, 在基于 NGN架构的 IPTV 系统中, 该应用功能可以与内 容交付与存储模块进行通信, 处理来自业务控制的选择内容交付与存储模块的 地址信息的请求。 内容交付装置用于将来自应用功能模块的内容进行分发、緩存或存储。在 具体处理实施过程中, 上述来自应用功能模块的内容可以是经过准备处理的内 容, 可选地, 准备处理可以包括以下至少之一: 内容聚合、 内容管理、 内容处 理、 元数据处理、 内容加密, 其中的内容准备处理可以在 NGN 中的应用功能 模块内完成, 也可以由 NGN之外的第三方完成, 也就是说, 来自应用功能模 块的内容可以是应用功能模块本地保存的内容, 也可以是来自 NGN之外的第 三方, 并由第三方进行了准备处理之后经由应用功能模块转发(分发)的内容。 图 2示出了根据本实施例的内容交付装置,如图 2所示,根据本发明实施 例的内容交付装置包括: 内容交付控制功能模块 10 , 用于控制内容交付与存储 功能模块 20的操作; 内容交付与存储功能模块 20, 其数量可以是多个, 也可 以是一个, 用于在内容交付控制功能模块 10 的控制下緩存或存储应用功能模 块分发的内容, 以及将緩存或存储的内容交付到终端用户, 该装置的结构如图
2所示, 其中, 出于清晰的目的, 图 2中仅示出了一个内容交付与存储功能模 块,本领域技术人员应当理解, 内容交付与存储功能模块可以是分布式部署的。 图 3示出了本发明实施例的内容交付装置的优选结构框架图,如图 3所示, 在图 2所示装置的基础上, 内容交付控制功能模块 10可以包括分发控制功能 实体 102和位置控制功能实体 104, 内容交付与存储功能模块 20可以包括交付 功能实体 202和分发功能实体 204。 分发控制功能实体 102, 用于建立基于文件或者流的分发策略, 管理多个 内容交付与存储功能模块之间的内容的分发, 以及利用位置控制功能实体 104 的信息来优化内容分发策略; 位置控制功能实体 104, 用于根据预定条件识别 具有能够将内容交付到终端用户的最佳位置信息的内容交付与存储功能模块 20。 其中,预定条件包括以下至少之一:内容交付与存储功能模块的分布信息、 内容交付与存储功能的负载状态、 终端用户的位置信息、 终端用户的处理能力 信息; 媒体控制消息用于通知内容交付与存储功能模块执行以下操作中的至少 之一: 播放、 暂停、 快进、 快退。 交付功能实体 202, 用于将需要交付的内容发送(交付)到终端用户, 以 及用于终端用户的上传和下载, 即, 对终端用户需要传输的内容传输到内容交 付装置 (内容交付功能实体) 的处理过程、 或者将存储的内容从内容交付装置 下载到终端用户的处理过程提供支持, 具体地, 交付功能实体 202用于终端用 户向至少一个内容交互与存储功能模块 20 上传或从其下载内容; 分发功能实 体 204, 用于在内容交付与存储功能模块 20之间分发 (转发 ) 内容以及来自终 端用户或者业务控制功能实体的处理媒体控制消息;緩存和存储功能实体 206, 连接至分发功能实体 204, 用于緩存或存储分发的内容。 方法实施例 在本实施例中, 提供了一种内容点播方法, 用于 NGN, 其中, NGN可以 包括终端用户、 业务控制功能实体、 以及上述的内容交付装置。 图 4示出了根据本发明实施例的内容点播方法的流程,如图 4所示,该方 法包括: 步骤 S402, 终端用户发起点播请求以播放相应内容; 步骤 S404, 内 容交付装置获取内容的 URL信息, 并将 URL信息返回给业务控制功能; 以及 步骤 S406, 终端用户请求分配网络资源, 在网络资源成功分配的情况下, 业务 控制功能实体将内容 URL信息返回给终端用户, 内容交付装置对终端用户播 放内容。 其中, NGN进一步包括应用功能模块,相应地,步骤 S402可进一步包括: 终端用户将点播请求发送至业务控制功能实体, 其中, 点播请求中携带有终端 用户的用户信息; 业务控制功能实体根据点播请求中的用户信息对终端用户进 行鉴权, 并在鉴权通过的情况下, 将获取播放 URL信息的请求消息经由支持 功能实体与业务支持功能实体发送至内容交付装置, 相应地, 在步骤 S404中, 内容交付装置响应于获取播放 URL信息的请求消息来获取 URL信息。 除此之外, NGN 进一步包括资源准入功能实体, 相应地, 在步骤 S406 中, 业务控制功能实体向资源准入功能实体请求分配网络资源。 下面结合图 5所示的流程图以 IPTV节目点播为例描述本实施例。 如图 5所示, 釆用根据本实施例的方法进行 IPTV点播时, 具体处理过程 如下 (步骤 502至步骤 522 ) . 步骤 502, 终端用户 ( EU ) 向业务控制功能实体 ( SCF )发送点播请求; 步骤 504, 业务控制功能实体接收上述点播请求, 并根据点播请求中携带 的该终端的用户信息对用户进行认证和鉴权, 通过认证和鉴权后, 业务控制功 能实体向 IPTV应用功能模块 ( AS ) 发送点播 URL的请求消息; 步骤 506, AS向内容交付模块( CDF )转发上述点播节目 URL的请求消 息; 步骤 508 , 内容交付控制模块根据分发策略(例如内容交付与存储模块中 负荷的状态等信息, 选择合适的内容交付与存储功能提供服务)选择合适的内 容交付与存储功能(获取 URL信息), 并分配在该内容交付与存储功能的本地 资源; 步骤 510, 内容交付功能实体 (CDF, 即, 上述的内容交付装置) 向 AS 返回提供点播频道服务的媒体服务器的 URL信息; 步骤 512, IPTV 应用功能向业务控制功能实体 ( SCF )返回提供点播节 目月艮务的媒体艮务器的 URL信息; 步骤 514 , SCF向资源准入控制功能实体 ( RACF )请求分配网络资源信
步骤 516, RACF模块分配网络资源信息; 步骤 518 , RACF模块向 SCF返回分配的网络资源信息; 步骤 520, SCF向 ITF返回提供点播节目服务的媒体服务器的 URL地址; 步骤 522, ITF与 SCF、 CDF等交互建立 RTSP链接, 为 ITF提供点播流 服务。 需要说明的是, IPTV节目的直播过程与上述 IPTV节目的点播过程类似, 这里不再重复描述。 系统实施例 在本实施例中, 提供了一种内容交付系统, 该内容交付系统可以位于图 1 所示的 NGN架构中。 图 6是才艮据本发明实施例的内容交付系统的结构框图,如图 6所示,根据 本实施例的内容交付系统包括业务控制功能实体和内容交付装置。 业务控制功能实体 60, 位于业务屋, 与内容交付装置 70和终端用户相连 接, 用于在终端用户发起点播请求, 播放相应内容后, 向内容交付装置发送获 取相应内容的 URL信息的请求, 在获取 URL信息之后请求网络资源, 并在网 络资源成功分配之后, 将获取的 URL信息发送至终端用户。 内容交付装置 70, 位于业务层, 用于响应于获取相应内容的 URL信息的 请求, 并将将 URL信息发送给业务控制功能实体, 以及在终端用户收到 URL 信息之后对终端用户播放相应内容。 进一步,业务控制功能实体还用于根据点播请求中携带的终端用户的用户 信息, 对终端用户进行鉴权, 并在鉴权通过的情况下, 向内容交付装置发送获 取内容的 URL信息的请求。 图 7示出了本发明实施例的内容交付装置的优选结构框架图,如图 3所示, 在图 6所示装置的基础上, 该内容交付系统进一步包括资源准入控制功能实体 80和应用支持功能实体与业务支持功能实体 90。 资源准入控制功能实体 80, 位于传输层, 用于在业务控制功能实体请求 分配网络资源的情况下分配网络资源, 并将网络资源的分配结果告知业务控制 功能实体。 应用支持功能实体与业务支持功能实体 90, 位于业务层, 其中包含应用 功能模块 902, 应用功能模块 902可以与业务控制功能实体 60相连接, 用于将 来自业务控制功能实体的获取内容的 URL信息的请求转发至内容交付装置, 以及将来自内容交付装置 70的 URL信息转发至业务控制功能实体 60。 根据本发明的再一个实施例, 提供了一种 NGN中的网络架构, 该网络架 构包括: 传输层; 业务层; 其中, 业务层进一步包括上述的内容交互功能装置, 内容交互功能装置用于实现传输屋与一终端用户之间的信息传输。 本发明通过改变 NGN 的架构, 即, 增加内容交付装置 (功能实体), 真 正实现了在 NGN网络中融合 IPTV等多媒体业务, 并提供融合后的 IPTV业务 的点播方法。 此外, 本领于技术人员应当理解, 本发明不仅可以用于在 NGN 网络中融合 IPTV业务, 还可以其它多种业务。 因此, 可以便利 NGN 中多种 业务的开展, 填补了相关技术中的空缺。 和现有技术相比, 本发明将交互式网络电视系统完全融合到 NGN 架构 ( NGN IMS或者 NGN non-IMS ) 中, 对现有的 NGN网络架构的业务层面加 入内容交付功能 ( Content Delivery Functions ) 进行改造, 基于该架构的 IPTV 系统能够实现 NGN网络改造,终端用户可以实现漫游和游牧功能,提升了 IPTV 系统的核心竟争力。 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。 凡在本发明的精神和原则 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. 一种内容交付装置, 用于在下一代网络中实现内容交付功能, 其中, 所 述下一代网络包括传输层和业务层 ,所述业务层包括业务控制功能实体, 所述传输层包括传输功能实体, 其特征在于,
所述内容交付装置位于所述传输层之上的所述业务层中,连接于所 述业务控制功能实体和所述传输功能实体之间, 用于将来自下一代网络 中的应用功能模块内容交付到终端用户。
2. 根据权利要求 1所述的内容交付装置, 其特征在于, 所述内容交付装置 还用于将来自所述应用功能模块的内容进行分发、 緩存或存储。
3. 根据权利要求 2所述的内容交付装置, 其特征在于, 所述内容交付装置 包括内容交付控制功能模块和至少一个所述内容交付与存储功能模块, 其巾,
所述内容交付控制功能模块,用于控制内容交付与存储功能模块的 操作;
所述至少一个所述内容交付与存储功能模块,用于在所述内容交付 控制功能模块的控制下緩存或存储来自所述应用功能模块的内容, 以及 将緩存或存储的所述内容交付到所述终端用户。
4. 根据权利要求 3所述的内容交付装置, 其特征在于, 所述内容交付控制 功能模块进一步包括分发控制功能实体和位置控制功能实体, 其中, 所述分发控制功能实体, 用于建立基于文件或流的内容分发策略, 管理所述至少一个内容交付与存储功能模块之间的内容的分发, 以及利 用所述位置控制功能实体的信息来优化所述内容分发策略;
所述位置控制功能实体,用于根据预定条件识别具有能够将内容交 付到所述终端用户的最佳位置信息的内容交付与存储功能模块。
5. 根据权利要求 4所述的内容交付装置, 其特征在于, 所述预定条件包括 以下至少之一: 所述至少一个内容交付与存储功能模块的分布信息、 所 述内容交付与存储功能的负载状态、 所述终端用户的位置信息、 所述终 端用户的处理能力信息。
6. 根据权利要求 3所述的内容交付装置, 其特征在于, 所述内容交付与存 储功能模块进一步包括:
交付功能实体, 用于将需要交付的内容发送到所述终端用户, 以及 用于所述终端用户向所述至少一个内容交互与存储功能模块上传内容, 或者, 从所述至少一个内容交互与存储功能模块下载内容;
分发功能实体, 用于在所述内容交付与存储功能实体之间分发内 容, 以及处理来自终端用户或者业务控制功能实体的媒体控制消息; 緩存和存储功能实体, 用于緩存或存储分发的所述内容。
7. 根据权利要求 6所述的内容交付装置, 其特征在于, 所述媒体控制消息 用于通知所述内容交付与存储功能模块执行以下操作中的至少之一: 播 放、 暂停、 快进、 快退。
8. 根据权利要求 1至 7中任一项所述的内容交付装置, 其特征在于, 所述 内容是经过准备处理的内容, 所述准备处理包括: 内容聚合、 内容管理、 内容处理、 元数据处理、 内容加密中的至少之一, 并且所述准备处理由 所述应用功能模块或所述下一代网络的外部第三方执行。
9. 一种内容点播方法, 用于下一代网络, 所述下一代网络包括终端用户、 业务控制功能实体、 以及根据权利要求 1至 7中任一项所述的内容交付 装置, 其特征在于, 所述方法包括:
步骤 S402, 所述终端用户发起点播请求, 以播放相应内容; 步骤 S404 , 所述内容交付装置获取所述内容的 URL信息, 并将所 述 URL信息返回给所述业务控制功能实体; 以及
步骤 S406, 所述业务控制功能实体请求分配网络资源, 在所述网 络资源成功分配的情况下,所述业务控制功能实体将所述内容的 URL信 息返回给终端用户, 所述内容交付装置对所述终端用户播放所述内容。
10. 根据权利要求 9所述的内容点播方法, 所述下一代网络进一步包括应用 功能模块, 其特征在于, 所述步骤 S402进一步包括:
所述终端用户将所述点播请求发送至所述业务控制功能实体, 其 中, 所述点播请求中携带有所述终端用户的用户信息;
所述业务控制功能实体根据所述点播请求中的用户信息对所述终 端用户进行鉴权, 并在鉴权通过的情况下, 将获取播放 URL信息的请求 消息经由所述应用功能模块发送至所述内容交付装置。
11. 根据权利要求 10所述的内容点播方法, 其特征在于, 在所述步骤 S404 中, 所述内容交付装置响应于所述获取播放 URL信息的请求消息, 获取 所述 URL信息。
12. 根据权利要求 9所述的内容点播方法, 所述下一代网络进一步包括资源 准入功能实体, 其特征在于,
在所述步骤 S406中, 所述业务控制功能实体向所述资源准入功能 实体请求分配网络资源。
13. 一种内容交付系统, 其特征在于, 所述系统包括:
业务控制功能实体, 位于业务层, 与内容交付装置和终端用户相连 接, 用于在所述终端用户发起点播请求以播放相应内容后, 向内容交付 装置发送获取所述内容的 URL信息的请求, 在获取所述 URL信息后请 求网络资源,并在所述网络资源成功分配之后将获取的所述 URL信息发 送至所述终端用户;
所述内容交付装置, 位于所述业务层, 用于响应于获取所述内容的 URL信息的请求, 并将所述 URL信息发送给所述业务控制功能实体, 以及在所述终端用户接收到所述 URL 信息之后对所述终端用户播放所 述内容。
14. 根据权利要求 13所述的内容交付系统, 其特征在于, 所述业务控制功能 实体还用于才艮据所述点播请求中携带的所述终端用户的用户信息对所述 终端用户进行鉴权, 并在鉴权通过的情况下, 向所述内容交付装置发送 获取所述内容的 URL信息的请求。
15. 根据权利要求 13或 14所述的内容交付系统, 其特征在于, 进一步包括 资源准入控制功能实体, 位于传输层, 用于在所述业务控制功能实体请 求分配所述网络资源的情况下分配所述网络资源, 并将所述网络资源的 分配结果告知所述业务控制功能实体。
16. 根据权利要求 13或 14所述的内容交付系统, 其特征在于, 进一步包括 应用支持功能实体与业务支持功能实体, 所述应用支持功能实体与业务 支持功能实体位于所述业务层, 其中包含应用功能模块, 其中, 所述应 用功能模块与所述业务控制功能实体连接, 并且用于将来自所述业务控 制功能实体的获取所述内容的 URL信息的请求,转发至所述内容交付装 置,以及用于将来自所述内容交付装置的所述 URL信息转发至所述业务 控制功能实体。 一种下一代网络中的网络架构, 其特征在于, 所述网络架构包括: 传输层;
业务层;
其中,所述业务屋进一步包括根据权利要求 1至权利要求 7中任一 项所述的内容交互功能装置, 所述内容交互功能装置用于实现所述传输 层与终端用户之间的信息传输。
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