WO2007012287A1 - Moyen d'acces haut debit et application de celui-ci - Google Patents

Moyen d'acces haut debit et application de celui-ci Download PDF

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Publication number
WO2007012287A1
WO2007012287A1 PCT/CN2006/001896 CN2006001896W WO2007012287A1 WO 2007012287 A1 WO2007012287 A1 WO 2007012287A1 CN 2006001896 W CN2006001896 W CN 2006001896W WO 2007012287 A1 WO2007012287 A1 WO 2007012287A1
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WO
WIPO (PCT)
Prior art keywords
video
video service
user terminal
unicast
access device
Prior art date
Application number
PCT/CN2006/001896
Other languages
English (en)
French (fr)
Inventor
Yue Chang
Jun Li
Zhijun Qu
Haijun Wu
Original Assignee
Huawei Technologies Co., Ltd.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Huawei Technologies Co., Ltd. filed Critical Huawei Technologies Co., Ltd.
Priority to AU2006274367A priority Critical patent/AU2006274367A1/en
Priority to EP06775241A priority patent/EP1919214A4/en
Priority to CA002617141A priority patent/CA2617141A1/en
Priority to CNA2006800121902A priority patent/CN101160964A/zh
Publication of WO2007012287A1 publication Critical patent/WO2007012287A1/zh
Priority to US11/849,968 priority patent/US20080060030A1/en

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L12/00—Data switching networks
    • H04L12/28—Data switching networks characterised by path configuration, e.g. LAN [Local Area Networks] or WAN [Wide Area Networks]
    • H04L12/2854—Wide area networks, e.g. public data networks
    • H04L12/2856—Access arrangements, e.g. Internet access
    • H04L12/2869—Operational details of access network equipments
    • H04L12/287—Remote access server, e.g. BRAS
    • H04L12/2874—Processing of data for distribution to the subscribers
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L65/00—Network arrangements, protocols or services for supporting real-time applications in data packet communication
    • H04L65/60—Network streaming of media packets
    • H04L65/61—Network streaming of media packets for supporting one-way streaming services, e.g. Internet radio
    • H04L65/611—Network streaming of media packets for supporting one-way streaming services, e.g. Internet radio for multicast or broadcast
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L65/00—Network arrangements, protocols or services for supporting real-time applications in data packet communication
    • H04L65/80—Responding to QoS
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
    • H04N21/20—Servers specifically adapted for the distribution of content, e.g. VOD servers; Operations thereof
    • H04N21/21—Server components or server architectures
    • H04N21/218—Source of audio or video content, e.g. local disk arrays
    • H04N21/21815—Source of audio or video content, e.g. local disk arrays comprising local storage units
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
    • H04N21/20—Servers specifically adapted for the distribution of content, e.g. VOD servers; Operations thereof
    • H04N21/25—Management operations performed by the server for facilitating the content distribution or administrating data related to end-users or client devices, e.g. end-user or client device authentication, learning user preferences for recommending movies
    • H04N21/266—Channel or content management, e.g. generation and management of keys and entitlement messages in a conditional access system, merging a VOD unicast channel into a multicast channel
    • H04N21/26616—Channel or content management, e.g. generation and management of keys and entitlement messages in a conditional access system, merging a VOD unicast channel into a multicast channel for merging a unicast channel into a multicast channel, e.g. in a VOD application, when a client served by unicast channel catches up a multicast channel to save bandwidth
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
    • H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
    • H04N21/47—End-user applications
    • H04N21/472—End-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
    • H04N21/47202—End-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
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
    • H04N21/60—Network structure or processes for video distribution between server and client or between remote clients; Control signalling between clients, server and network components; Transmission of management data between server and client, e.g. sending from server to client commands for recording incoming content stream; Communication details between server and client 
    • H04N21/63—Control signaling related to video distribution between client, server and network components; Network processes for video distribution between server and clients or between remote clients, e.g. transmitting basic layer and enhancement layers over different transmission paths, setting up a peer-to-peer communication via Internet between remote STB's; Communication protocols; Addressing
    • H04N21/637—Control signals issued by the client directed to the server or network components
    • H04N21/6375—Control signals issued by the client directed to the server or network components for requesting retransmission, e.g. of data packets lost or corrupted during transmission from server
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
    • H04N21/60—Network structure or processes for video distribution between server and client or between remote clients; Control signalling between clients, server and network components; Transmission of management data between server and client, e.g. sending from server to client commands for recording incoming content stream; Communication details between server and client 
    • H04N21/63—Control signaling related to video distribution between client, server and network components; Network processes for video distribution between server and clients or between remote clients, e.g. transmitting basic layer and enhancement layers over different transmission paths, setting up a peer-to-peer communication via Internet between remote STB's; Communication protocols; Addressing
    • H04N21/64—Addressing
    • H04N21/6405—Multicasting
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
    • H04N21/60—Network structure or processes for video distribution between server and client or between remote clients; Control signalling between clients, server and network components; Transmission of management data between server and client, e.g. sending from server to client commands for recording incoming content stream; Communication details between server and client 
    • H04N21/63—Control signaling related to video distribution between client, server and network components; Network processes for video distribution between server and clients or between remote clients, e.g. transmitting basic layer and enhancement layers over different transmission paths, setting up a peer-to-peer communication via Internet between remote STB's; Communication protocols; Addressing
    • H04N21/64—Addressing
    • H04N21/6408—Unicasting
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N7/00—Television systems
    • H04N7/16—Analogue secrecy systems; Analogue subscription systems
    • H04N7/173—Analogue secrecy systems; Analogue subscription systems with two-way working, e.g. subscriber sending a programme selection signal
    • H04N7/17309—Transmission or handling of upstream communications
    • H04N7/17318—Direct or substantially direct transmission and handling of requests

Definitions

  • the invention relates to the field of network communication technologies, and particularly relates to a broadband access device and an application thereof.
  • Video services such as video broadcasting, VoD (video on demand), etc. are a major focus.
  • the Video service relies on two basic transmission modes: multicast and unicast. Some complex applications are also implemented by unicast and multi-streaming.
  • the bearer network needs to provide reliable video stream distribution and corresponding QoS guarantee according to the video service requirements.
  • the network architecture for providing video services based on broadband access networks before 1-1 is shown in Figure 1.
  • 'NT Network Terminal
  • CPE User Terminal Equipment
  • STB top set
  • CPK and NT are logical concepts. They belong to the user or user's home network equipment. In practice, they can be launched on a terminal.
  • a 3G mobile phone provides both network access and video Yingchuan: It can also be a separate device. Such as (Home Gateway, Residential Gateway) and STB (Set Top Box).
  • Access Node is a device that provides broadband access aggregation, such as DSLAM (Digital Subscriber Line Access Multiplexer) based on DSL access network, wireless access network based on WiMax, Wi-Fi, UMTS, etc.
  • BS Base Station
  • Cable Access CM CMTS (3 ⁇ 4 Cable Adjusting Demodulator Termination System) Service Gateway is a device that provides network and Yingchuan control, such as BRAS, ER (edge router, Iidgc Router) ), GGSN/SGSN (GPRS gateway support node / GPRS service support ⁇ '!:) _ point).
  • the Edge video server is a video server that can behave as a host on the network. The video server provides video services for the video terminal. In principle, only legitimate users can access it. In this case, the video server generally places the network jg illl on the BRAS. In this way, access to the video server can only be achieved through BRAS authentication, which ensures the security of the video service components.
  • group video streams are distributed from the Video Headend to the end user along the tree topology through the core network.
  • unicast video services the video stream is pushed directly from the video server to the end user.
  • ⁇ special business ⁇ , ⁇ to neutralize the implementation of multicast, such as Time Shift TV (Time Shift TV)
  • the group technology is very good to alleviate the consumption of network bandwidth by video and Ik services.
  • the establishment of a multicast tree is generally based on a multicast path.
  • the general solution is: Use a hierarchical distributed video server to provide video services through distributed video server partitions.
  • the H-band broadband bearer network under the service provider point, such as BRAS/ER is connected to the network and is separated from the traffic. Therefore, the distributed video server Can only be placed on business delivery points such as BRAS/ER.
  • the existing solutions mainly include: Relying on the retransmission mechanism, that is, for the unicast video stream, the mobile terminal detects that the message is lost, and sends the f ⁇ H ⁇ to the source to request retransmission. Qu is no retransmission mechanism for multicast traffic ⁇
  • the distributed video server is placed on the top of the service provider. Although it can ensure that only the terminal authenticated by the network can use the video server to make the network bandwidth between the access and the service provider point completely controllable, however,
  • the service provider manages the network resources of the access network M, it needs to dynamically perceive the video stream of the video server, so that the network resource management at the service provider point is complicated, and the number of users of the broadband access network increases. As the demand for video services expands rapidly, the bandwidth bottleneck between service providers and access networks becomes more prominent.
  • the unicast video stream The transmitted message ⁇ consumes the access network to the aggregation layer, and even more ⁇ . layer ⁇ '1'd network bandwidth.
  • the H of the present invention is to provide a broadband access device and its corresponding ffl, and to improve the network bandwidth utilization by embedding the video service unit in the wide 'band access device, reducing the complexity of network resource management. Degree' eliminates the purpose of video server bottlenecks.
  • the present invention provides a broadband access device, wherein the broadband access device has a video service unit, and the built-in video service unit stores the stored video according to the request of the user terminal.
  • the broadband access equipment in which it is located is transmitted to the Sichuan terminal.
  • the video service unit includes: a unicast storage module and a unicast forwarding module;
  • Unicast storage module stores unicast video services
  • the forwarding module is configured to transmit the corresponding unicast video service stored in the single-storage storage module to the user terminal through the broadband access device in which the unicast video service of the user terminal is located.
  • the video service unit further includes: ⁇ broadcast retransmission module;
  • the broadcast retransmission module after receiving the retransmission lost video message request of the iT! terminal, according to the lost information, the corresponding unicast video message stored in the unicast storage module is connected through the broadband Incoming device transmission to user terminal
  • the video service unit is provided with a plurality of storage modules and a plurality of retransmission modules;
  • Multicast storage horizontal block Real-time acquisition of multicast video stream transmitted from the network side and storage:
  • the multicast S-transmission module after receiving the retransmission lost multicast video message request of the Sichuan terminal, according to the lost information, the corresponding multicast video message stored in the multicast storage module passes through the unicast mode.
  • the broadband access device is transmitted to the user terminal.
  • the broadband access device is further configured with: a video service unit access control module;
  • the invention provides a network system for providing video services based on a broadband access device, comprising: a video throwing, a service gateway, and a broadband access device with a video service unit built therein;
  • the video source transmits the video stream to the service gateway, and the video stream is transmitted to the Kawago terminal by the service gateway and the broadband access device with the built-in video service unit.
  • Wood Invention also provides a video service 3 ⁇ 4 method, including:
  • a video service ticket is built into the broadband access device
  • the video service unit transmits the stored video service to the user terminal according to the request of the user terminal through the broadband access device where the user is located.
  • the broadband access device includes: a digital subscriber line access multiplexer.
  • the video service of the step b ⁇ includes: a unicast video service and/or a multicast video service;
  • step b specifically includes:
  • the video service unit transmits the corresponding unicast video service stored by the terminal to the user terminal through the unicast video service of the terminal: and/or The video service unit acquires a plurality of video streams transmitted by the network side in real time and stores: the video service unit receives the user terminal's request for transmitting the lost multicast video message, and stores the lost information according to the lost information.
  • the corresponding multi-picture video message is transmitted to the user terminal in a unicast manner through the broadband access device in which it is located.
  • the step b further includes:
  • the video service unit When receiving the transmission of the lost multicast video message request, the video service unit transmits the corresponding unicast video message stored by the user to the user through the broadband access device according to the lost message. terminal.
  • the method further includes:
  • the user terminal that sends the request in the step b is: a user terminal that allows access to the video service unit.
  • the present invention enables the video service unit to directly provide video services to the user terminal by embedding the video service unit in each of the broadband access devices, thereby reducing the video service access network and
  • the bandwidth requirements of the aggregation network have enabled some new video services to effectively solve the bandwidth bottleneck problem of the ifO bone network and the aggregation network.
  • the video service ticket built into the broadband access device can be more convenient for the unicast.
  • the switching of services and multicast services speeds up the channel switching speed, resulting in a better customer experience.
  • the video service element can be regarded as a resource of the broadband access device itself. It has no impact on the current wide access network and convergence network level ffil and Ik service isolation design principles, and simplify the resource management mechanism for saving access networks and aggregation networks; built in broadband access equipment
  • the related network bandwidth resources between the video service unit and other network backups become internal resources of the device, reducing
  • the frequency service provides the bandwidth requirements of the access layer network and the aggregation layer network, and the management control at the C ⁇ network level simplifies the multiplexing of the access network resource management; the unicast video stream message of the present invention*
  • the traffic does not occupy the bandwidth of the network layer of the convergence layer, and the video service unit effectively supports the transmission of the lost message of the multicast video stream, so that the video quality of the user terminal is effectively improved, and the retransmission of the multicast video stream message is also the same.
  • the bandwidth access device of the present invention does not affect the design of the video service unit of the user terminal, and does not affect the design principle of the existing network in the access layer.
  • the access control of the network access control is simplified; thereby improving the network bandwidth utilization and reducing the complexity of the network resource management by the technology provided by the present invention. , eliminating the video server bottleneck.
  • FIG. 1 is a schematic diagram of a network architecture for providing video services based on a broadband access network in the prior art:
  • the cabinet 2 is a schematic diagram of the network architecture of the video service based on the broadband access network of the present invention;
  • 3 is the stream of the multicast video message of the present invention.
  • the video server is placed at the service provider point. h, the network resource management at the service provider point is rectified, and the bandwidth bottleneck between the service provider point and the access network and the video server bottleneck phenomenon become more prominent. If the video server is simply placed in the access layer in order to solve the above problem, the access and aggregation layer networks under the service provider point are required to support the video service exchange capability, which brings hidden dangers to network security. If the video server is deployed on the aggregation network of the broadband access node and the service provider point, the logical topology of the service flow in the access network will not be a simple tree structure, thereby causing access to network resource management. The complexity.
  • the invention provides a broadband access device, a network system for providing a video service based on a broadband access device, and a video service implementation method.
  • the video service is built in the broadband access device by using a built-in
  • the broadband access device of the video service and its network provide video services for the user terminal, which effectively solves the above problems.
  • the broadband access device Hi with built-in video service unit of the invention is: DSLAM, the video service unit in the broadband access device and the standby device: the broadcast storage module, the unicast forwarding module, the unicast 2 transmission module , multicast storage module and multicast retransmission module.
  • the broadband access device of the present invention is further provided with a video service unit access control module.
  • the video service unit access control module is mainly used for performing video service « ⁇ - ⁇ access control on the user terminal according to the access authority information.
  • the access authority information may be stored in the video service unit access control module.
  • the video service unit access control module determines the access attribute information of the user terminal, such as PVC, ⁇ , etc. And determining the access right of the user terminal to access the video service unit, and performing the access f' ' control of the video service unit according to the access authority corresponding to the user terminal
  • the unicast storage module is mainly used for storing the video service.
  • the unicast video service stored by the ⁇ ⁇ storage module can be obtained from the video source, such as the unicast storage module receiving and storing the network side, such as the video source through the service.
  • the unicast video stream transmitted by the gateway is mainly used for storing the video service.
  • the unicast forwarding module is mainly used to transmit the corresponding unicast video service stored in the unicast storage block to the corresponding user terminal according to the unicast video service request of the user terminal.
  • the user terminal should be a user terminal that allows access to the video service unit.
  • Unicast direct transmission module ⁇ to be used after receiving the *transmission unicast video message request from the user terminal,
  • the unicast data packet stored in the unicast and unicast storage block of the unicast video stream message of the user terminal transmits the lost unicast video to the terminal 2E through the broadband access device in which the terminal is located. Message.
  • the storage module is mainly used to collect and store the multicast video stream transmitted from the network side in real time.
  • the multi-patterned module is used to unicast after receiving the ⁇ : loss of the multicast video message request from the user terminal, according to the lost information, the corresponding multicast video message stored in the multicast storage module , The mode passes; the broadband access device where the S is located, retransmits the lost multicast video message for the user terminal.
  • the user terminal should be a wide-range terminal that allows access to the MIMO service unit.
  • the multicast video stream of the present invention includes: a broadcast video stream and a multicast video stream.
  • the broadband network access of the present invention Each network system providing video services is as shown in FIG.
  • the network system in Figure 2 mainly includes: a video source, a service gateway, and a broadband access device with a video service unit built therein.
  • the video source transmits the unicast video stream and the multicast video stream to the service gateway, and the service gateway transmits the unicast video stream and the multicast video stream to the broadband access device with the built-in video service unit, and the broadband access device is built in.
  • the video service medium-element stores the unicast video stream, and transmits the corresponding unicast video message stored by the broadband access device to the corresponding user terminal through the unicast video message request of the Chuanchuan terminal.
  • the broadband access device transmits the multicast video stream to the
  • the following describes the network system and the video service implementation method for providing the video service based on the broadband access device according to the implementation method of the multicast video service retransmission as an example.
  • step 1-1 the multicast video stream is directly transmitted from the video source, the service gateway, and the broadband access device to the user terminal, and the multicast access authority control of the user terminal is implemented by the mechanism, which is not in the scope of the present invention.
  • the video service unit caches the traffic in the Cache group.
  • the buffered capacity is the maximum transmission delay allowed by the video service.
  • step 3 the user terminal detects that the multicast video stream packet is lost, and sends a retransmission 3 ⁇ 4 lost multicast video message request to the video service unit.
  • the video service application unit After step 4, after receiving the retransmission of the lost multicast video message request, the video service application unit first determines the legality of the user terminal based on the access authority information of the ffl terminal that issued the request, and determines the legitimacy of the user terminal. After unicast The type will send the lost group video message of the E-transmission to the user terminal.
  • the invention has built the video service unit into the broadband access device, so that the video service unit can directly provide the video service to the user terminal, thereby reducing the bandwidth requirement of the video service for the access network and the aggregation network, so that ⁇ these new video services such as PVR (personal video Record personal ⁇ camera), (time-shifted TV) time shift TV, rainy face ⁇ brought the backbone network and the convergence of a bandwidth bottleneck problem has been effectively solved; 1.
  • PVR personal video Record personal ⁇ camera
  • time-shifted TV time shift TV
  • rainy face ⁇ brought the backbone network and the convergence of a bandwidth bottleneck problem has been effectively solved
  • the ready-to-use video service unit can more easily switch between mid-cast and multicast services, speeding up channel switching, resulting in a better customer experience; built-in video service unit
  • the video service unit can be regarded as a resource of the broadband access device itself, and the design principle that the existing broadband access network and the aggregation network do not realize the video service exchange does not sound, when
  • the resource management mechanism of the access network and the aggregation network; the related network band between the video service unit and other network devices in the broadband access setting The resource becomes a set of internal resources, reducing the bandwidth requirements of the video and Ik service provider points to the access layer network and the aggregation layer network, and does not require the network layer management control, and simplifies the access network resource management ⁇ ⁇ 4 degrees; Since the retransmission stream of the unicast video stream packet does not occupy the bandwidth of the aggregation layer network, the network bandwidth is improved, and the video service ticket built in the access device effectively supports the retransmission of the lost packet of the multicast video stream.
  • the video quality of the user terminal is effectively improved, and the ffi transmission of the multicast video stream message does not occupy the bandwidth of the access layer network and the aggregation layer network bandwidth.
  • the invention does not need to move the characteristics of the BRAS to the access device, and the access device can simply access the video service unit by using the access authority corresponding to the attribute such as the PVC, the end IJ and the like according to the user terminal access connection. Control, so that the security of the access network is ensured without affecting the design principle of the existing network in the access layer service isolation, which simplifies the access control a of access network access control.

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  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Databases & Information Systems (AREA)
  • Human Computer Interaction (AREA)
  • Data Exchanges In Wide-Area Networks (AREA)
  • Two-Way Televisions, Distribution Of Moving Picture Or The Like (AREA)

Description

一种宽带接入设备及艽应用
技术领域
本发明涉及网络通讯技术领域， 具体涉及' -种宽带接入设备及其应用 .
发明背景
随着各种宽带接入技术如基 '」'·双绞线的 DSL (数 用户环路）、 基于光纤和. X线接 入 技术的普及， 运营商期望在网络中开展更多的业务， 其屮 Video (视频） 业务如视 频广播、 VoD (视频点播） 等是一个重点。
Video业务主要依赖多播和单播两种基本传送模式， 有些复杂的应用还¾耍单播和 多描混合交锊来实现。 承载网需要极据视频业务需求提供可靠的视频流分发和相应的 QoS保证。
1-1前基于宽带接入网络提供视频业务的网络架构如附图 1所示。
图 1屮， 'NT (Network Terminal, 网络终端） 是将最终用户接入网络的终端， 如 DSL Modem 。 CPE (用户终端设备）是最终用户业务和应用的终端， 如 STB (机顶众）等。 CPK和 NT是逻辑上的概念，属于用户或者用户家庭网络设备，在实际屮可以炚射到一个 终端上， 如 3G手机同时提供了网络接入和视频应川： 也可以.是分离的设备， 如 (家 庭网关， Residential Gateway) 和 STB (机顶盒） 等。 Access Node (接入节点） 是提供 宽带接入汇聚的设备， 如基于 DSL接入网络中的 DSLAM (数字用户线路接入复用器） 、 基于 WiMax、 Wi-Fi, UMTS等无线接入网络屮的 BS (基站）、 Cable接入屮的 CMTS ( ¾ 缆调整解调器终结系统） 》 Service Gateway (服务网关）是提供网路和应川控制的设备， 如 BRAS, ER (边缘路由器， Iidgc Router) , GGSN/SGSN ( GPRS网关支持节点 / GPRS 服务支持 ·'!：)_点）等。 Edge video server (边缘视频服务器）是一个视频服务器， 可以表现 为网络中的一个主机。 视频服务器为视频终端提供视频业务， 原则上只有合法的用户才 可以访问， 闪此， 视频服务器一般放置的网络 jg illl在 BRAS之上。 这样， 对于视频服务 器的访问只有通过 BRAS认证 )Π·才能实现， 保证了视频服务部件的安全。
前， 实现 Video业务的方法为：
对于组播类型的 Video业务， 组攒视频流从 Video Headend (视频头端）经过核心网 沿着树型拓扑分发到最终用户。对于单播视频业务， 视频流从视频服务器直接推送到最 终用户。对于有^特殊的业务^求， ^要中 和组播夂替实现，比如时移电视（Time Shift TV ) 等
组擂技术很好的缓解了视频、 Ik务对网络带宽的消耗。组播树的建立一般基于组播路
1 确认本 ώ协议〖GMP/P /DVMRP ( r:联网组管理 |办议 /独立组播协议 /距离向量组播路屮协议） 等。
/+:上述实现 Video业务过程中有如下两个比较突山的问题：
问题一、 随着视频用广和视频业务的增加对网络带宽消耗的问题。
问题二、 接入技术如 DSL接入技术、 WiMAX接入技术等的误码率导致视频质跫 |、 降的问题。
针对问题一， 为了解决视频业务对网络带宽的消耗， 视频服务器瓶颈等问题， 目甜 通用的解决方案为： 釆用层级分布式视频服务器， 通过分布式视频服务器分区提供视频 服务。 出于安今和网络资源可管 ¾的 H的， H前的宽带承载网在业务提供点如 BRAS/ER 之下的接入网络是川户和业务隔 κ的， 因此， 分布式的视频服务器只能放置到业务提供 点如 BRAS/ER等之上。
针对问题二， 现有的解决方案主要为： 依赖应 的重传机制， 即针对于单播视频 流， 移动终端检测到报文 ¾失时， 向源端发送 f†H青要求重传，.伹是对于多播业务没有重 传机制 Λ
分布式的视频服务器放: £在、 !k务提供点之上， 虽然能够保证只有通过网络认证的终 端才能 ½ 视频服务器、 使接入 和业务提供点之间的网络带宽完全可控， 但是， 业务 提供点在对其与接入网之 M的网络资源进行管理时， 需要动态感知视频服务器的视频 流， 使业务提供点处的网络资源管理复杂， 而且， 随着宽带接入网络用户的增加和视频 业务需求的快逨扩展， 业务提供点和接入网之间的带宽瓶颈越发突出。
对于组播业务流， 于组播本身没有定义¾传机制， 不可能针对某个組播节点进行 md> 使视频质量受损， 而且， 由于报文的丟失主要发生在接入介质段、 视频服务器部 署在汇聚层或者更高层， 单播视频流的: 传的报文^要消耗接入网络到汇聚层、甚至更 卨.层之 ι'1'd网络带宽。 发明内容
本发明的 H的在于， 提供. ·^宽带接入设各及其应 ffl， 通过将视频服务单元内置于宽' 带接入设备中， 以实现提高网络带宽利用亨 ·， 降低 络资源管理复杂度' 消除视频服务 器瓶颈的目的。
为达到上述 I l的，本发明提供的一种宽带接入设备，所述的宽带接入设各屮内 有 视频服务单元，所述内置的视频服务单元根据用户终端的请求将其存储的视频业务通过 其所在的宽带接入设备传输至川户终端。
所述视频服务单元包括： 单播存储模块和单播转发模块；
单播存储模块： 存储有单播视频业务；
槠转发模块： 根据用户终端的单播视频业务诘求将单擓存储模块中存储的对应单 播视频业务通过其所在的宽带接入设备传输至用户终端。
所述视频服务单元中还设 ^有： ^播重传模块；
播重传模块： 在接收到 iT!户终端的重传丢失 旙视频报文请求后， 裉据所述丢失 的信息将单播存储模块中存储的对应单播视频报文通过其所在的宽带接入设备传输至 用户终端
所述视频服务单元中设 多撺存储榄块和多撺重传模块；
多播存储横块： 实时获取网络侧传输来的多播视频流并存储：
多播 S传模块： 在接收到川 终端的重传丟失多播视频报文请求后， 根据所述丢失 的信息将多播存储模块中存储的对应多播视频报文以单播方式通过其所在的宽带接入 设备传输至用户终端。
所述宽带接入设备还设 有： 视频服务单元访 控制模块；
视频服务单元 ·问控制模块： 获取用户终端的接入权限信息， 并根据该接入权限信 息对用户终端进行视频服务单^的 1力问控制。
本发明提供的一种基于宽带接入设备提供视频业务的网络系统， 包括： 视频抛、服 务网关、 内置有视频服务单元的宽带接入设备；
所述视频源将视频流传输. :服务网关， 并由服务网关、 内置有视频服务单元的宽带 接入设备将所述视频流传输至川户终端。
木发明还捣供一种视频业务 ¾现方法 , 包括：
a、 在宽带接入设备中内置视频服务单 ；
b、 所述视频服务单元根据用户终端的请求将其存储的视频业务通过其所在的宽带 接入设备传输至用户终端。
所述宽带接入设备包括： 数字用户线接入复接器。
所述步骤 b屮的视频业务包括： 单播视频业务和 /或多播视频业务；
且所述歩骤 b具体包括：
所述视频服务单元根掂用 终端的单播视频业务诺求将其存储的对应的单播视频 业务通过其所在的宽带接入设备传输至用户终端： 和 /或 所述视频服务单元实时获取 络侧传输来的多嵇视频流并存储： 所述视频服务单元 接收到用户终端的; ¾传丢失多播视频报文请求时， 根据所述丢 失的信息将其存储的对应的多描视频报文以单播方式通过其所在的宽带接入设备传输 至用户终端。
所述 ^骤 b还包括：
视频服务单元在接收到 ffl户终端的 »传丢失多播视频报文请求时， 根据所述 ¾失的 信总将其存储的对应的单播视频报文通过 所在的宽带接入设备传输至用户终端。
所述步骤 b之前还包括：
根据用户终端的接入权限佶息确定允许访问视频服务单元的 ffl户终端；
且所述步骤 b中发送请求的用户终端为： 允许访问视频服务单元的用户终端。 通过上述技术方案的描述" ί知，本发明通过将视频服务单元内置在宽带接入设各内 部， 使视频服务单元可以直接向用户终端提供 ^播视频业务， 减轻了视频业务对接入网 络和汇聚网络的带宽需求， 使得一些新型视频业务带來 ifO骨千网与汇聚网带宽瓶颈问题 得到了有效的解决； 内置于宽带接入设备中的视频服务单.元能够更加方便的 ¾现单播业 务和组播业务的切换， 加快了频道切换的速度， 从而带来更好的客户体验； 由于视频服 务单元内 ¾在接入设备中， 视频服务 元可以视为宽带接入设备本身的资源， 对现 的 宽 接入网络和汇聚网络层面 ffil广和、 Ik务隔离的设讣原则没有影响， 同吋， 简化救个接 入网络和汇聚网络的资源管理机制； 内置在宽带接入设备中的视频服务单元和其他网络 备之间的相关网络带宽资源变成了设备内部资源，减少视频业务提供点对接入层网络 .和汇聚层网络的带宽需求， 且; C^ 络层面的管理控制， 简化了接入网络资源管理的复 度； 本发明的单播视频流报文的 *传流量不占川汇聚层网络带宽， 且视频服务单元有 效支持了多播视频流丢失报文的 ¾传， 使用户终端的视频质量得到有效改善， 而且， 多 播视频流报文的重传同样不占川接入层网络和汇聚^网络带宽的消耗。本发明的宽带接 入设备可以 现用户终端对视频服务单元的访问控制，在不影响现有网络在接入层业务 不交换的设计原则的情况下， 保 iE /接入网络的安 ^， 简化了接入网络访问控制的权限 管玴； 从而通过本发明提供的技.术方案实现了提高网络带宽利用率， 降低网络资源管理 复杂度， 消除视频服务器瓶颈的 的。 附图简要说明
图 1是现有技术的基于宽带接入网络提供视频业务的网络架构示意图： 阁 2是本发明的基于宽带接入网络捣供视频业务的网络架构示意图； 3是本发明的实现多播视频报文茧传的流 ¾图„
实施本发明的方式
视频服务器放置在业务提供点之. h，会使业务提供点处的网络资源管理复尕，而 .， 会使业务提供点和接入网之间的带宽瓶颈现象、视频服务器瓶颈现象越发突出， 如果为 了解决上述问题， 仅仅简单的将视频服务器放置到接入层， 那么， 势必会要求业务提供 点之下的接入和汇聚层网络支持视频业务的交换能力， 对网络安全带来隐患， 而且， 如 果视频服务器部署在宽带接入节点和业务提供点之 I'i'd的汇聚网上，那么接入网内业务流 逻辑拓扑将不是简单的树型结构， 从而， 导致接入^网络资源管理的复杂性。
为解决上述问题， 木发明提供一种宽带接入设备、 基于宽带接入设备提供视频业务 的网络系统和视频业务实现方法， 通过将视频服务中-元内置于宽带接入设备中， 由内置 了视频服务^元的宽带接入设备及其所在的网络为用户终端提供视频 务，有效解决了 上述问题。
下面结合附图对本发明提供的技术方案做进一歩的描述。
本发明内置有视频服务单元的宽带接入设备 Hi以为： DSLAM , 内^在宽带接入 设.备中的视频服务单元主耍包拈： 播存储模块、 单播转发模块、 单播 2Ϊ传模块、 多播 存储模块和多播重传模块。为保证接入 络的安全，简化接入网络访^控制的权限管理， 本发明的宽带接入设备中还设 有视频服务单元访问控制模块。
视频服务单元访问控制模块主要用于根据接入权限信息对用户终端进行视频服务 «ΐ-元的访问控制。 接入权限信总可存储在视频服务单元访问控制模块屮， 3用户终端访 问视频服务单元时，视频服务单兀访问控制模块确定用户终端的接入属性信息，如 PVC， 端 Γ·ί等， 并确定该用户终端访 视频服务单元的接入权限， 并根据该用户终端对应的接 入权限进行视频服务单元的访 f' '」控制
单播存储模块主要用于存储 ^播视频业务， .ΐ·播存储模块存储的单播视频业务可以 是从视频源处获符的， 如单播存储模块接收并存储网络侧如视频源通过服务网关传输来 的单播视频流。
单播转发模块主要用于根据用户终端的单播视频业务请求， 将单播 储桢块中存储 的对应单播视频业务， 通过其所在的宽带接入设备传输 对应的用户终端。 该用户终端 应该是允许访问视频服务单元的用户终端。
单播直传模块 Φ:要用于在接收到用户终端的 *传 失单播视频报文请求后， 裉据用 户终端单播视频流报文¾失的佶总、 单播存储桟块中存储的单播数据报文， 通过其所在 的宽带接入设备为该用 /'·终端 2E传丢失的单播视频报文。
多播 ：储模块主要用于实时获収网络侧传输来的多播视频流并存储。
多描 ¾传模块 ΐ要用于在接收到用户终端的 Φ:传丢失多播视频报文请求后， 根据丢 失的信息、 多播存储模块屮存储的对应的多播视频报文， 以单播方式通过; S所在的宽带 接入设备， 为该用户终端重传 ¾失的多播视频报文。 用户终端应该是允许访问枧频服 务单元的用广终端。
本发明巾的多播视频流包括： 广播视频流和组播视频流。
本发明的基 Τ宽带接入 各提供视频业务的网络系统如附图 2所示。
图 2中的网络系统主要包括： 视频源、 服务网关和内置有视频服务单元的宽带接入 设备。 视频源将单播视频流、 多播视频流传输至服务网关， 服务网关将单播视频流、 多 播视频流传输至内置有视频服务^元的宽带接入设各， 宽带接入设备中内置的视频服务 中-元存储该单播视频流， 并裉裾川户终端的单播视频报文请求， 通过宽带接入设备将其 存储的相应的单播视频报文传输至对应的用户终端。宽带接入设备将组播视频流传输至. 用 |终端的同时， 内¾的视频服务单元获取并存储多播视频流； 视频服务单元在接收到 用户终端的重传丢失多播视频报文请求后， 根据 失的信息、 视频服务单 71：中存储的对 应的多播视频报文， 以单播方式通过其所在的宽带接入设备， 为该用户终端重传 ¾失的 多播视频报文。
下面结合附图 3以组播视频业务重传的实现方法为例对本发明的基于宽带接入设备 提供视频业务的网络系统和视频业务实现方法进行详細说明。
图 3中， 在 骤 1-1、 组播视频流直接从视频源、 服务网关、 宽带接入设各传送到 用户终端， 用户终端的组播访问权限控制通过艽他机制实现， 不在本发明范围内。
到歩骤 1-2、 视频服务单元实时缓存 （Cache) 组攒流量， 缓存的容量为视频业务允 许的最大传输时延。
到^骤 2、 在组播视频流^输¾用户终端的过程屮由于线路传输误码导致用户终端 接收的多播视频流报文发生丢失。
到步骤 3、 用户终端检测到组播视频流报文发生丟失现象， 向视频服务单元发送重 传¾失多播视频报文请求。
到歩骤 4、 视频服务申-元接收到重传丢失多播视频报文谙求后， 首先基于发出谙求 的 ffl户终端的接入权限信息判断该用户终端的合法性， 通过合法性判断后， 通过单播方 式将用 谘求 E传的丢失組檷视频报文发送给用户终端
本发明逋过将视频服务单元内置在宽带接入设备内郯，使视频服务^元可以直接向 用户终端提供 ^楝等视频业务， 减轻了视频业务对接入网络和汇聚网络的带宽需求， 使 得 ·些新型视频业务如 PVR (Personal Video Record个人彔像机）、 Time Shift TV (时移 电视） 、 多雨面^带来的骨千网与汇聚 1带宽瓶颈问题得到了有效的解决； 内.1 :了-宽带 接入' 备屮的视频服务单元能够更加方便的实现中 ·播业务和组播业务的切换，加快了频 道切换的速度， 从而带来更好的客户体验； 由于视频服务单元内置在接入设备中， 视频 服务单元可以视为宽带接入设备本身的资源， 对现有的宽带接入网络和汇聚网络不实现 视频业务交换的设计原则没有^响， |H」时， 简化整个接入网络和汇聚网络的资源^理机 制； 内貲在宽带接入设各中的视频服务单元和其他网络设备之间的相关网络带宽资源变 成了设各内部资源， 减少视频、 Ik务提供点对接入层网络和汇聚层网络的带宽需求， 且无 需网络层而的管理控制， 简化 接入网络资源管^的复¾度； 由亍单播视频流报文的重 传流 ¾不占用汇聚层网络带宽， 提高了网络带宽利 ffl率； 由于接入设备内置的视频服务 单 有效支持了多播视频流丢失报文的重传， 使用户终端的视频质量得到有效改善， 而 Ά, 多播视频流报文的 ffi传同样不占用接入层网络和汇聚层网络带宽的消耗。 本发明无 需将 BRAS等特性移枋到接入设各屮， 接入设备可以简单的根据用户终端接入连接如 PVC, 端 IJ等属性对应的权限信总， 实现用 终端对视频服务单元的访问控制， 这样， 在不影响现有网络在接入层业务隔离的设计原则的情况下' 保证了接入网络的安全' 简 化了接入网络访问控制的权限管 a。
虽然通过&施例描绘了本发明， 本领域普通技术人员知逍， 本发明有许多变形和变 化而不脱离木发明的精神， 本发明的申请文件的权利要求包括这些变形和变化。

Claims

权利要求
1、 一种宽带接入设备， 其特征在于， 所述的宽带接入设备中内置有视频服务单元， 所述内賈的视频服务单元根据用户终端的请求将其存储的视频业务通过其所在的宽带 接入设备传输至用 终端。
2、如权利要求 1所述的一种宽带接入设备， 其特征在于， 所述视频服务单 包括： 单播存储模块和单播转发模块：
^播存储模块： 存储有单播视频业务；
中播转发模块： 根据用户终端的单祯视频业务 '清求将单播存储模块中存储的对应单 播视频业务逝过; K所在的宽带接入设各传输至用户终端。
3、 如权利要求 2所述的一种宽带接入设备， 其特征在于， 所述视频服务单元巾还 ¾有： 单播重传模块；
单播:欺传模块： 在接收到用户终端的重传 ¾失单播视频报文请求后， 根据所述丢失 的信息将单播存储模块中存储的对应单播视频报文通过其所在的宽带接入设备传输 用户终端。
4、 如权利要求 1 所述的 种宽带接入设备， 其特征在于， 所述视频服务单元中设 多播存储模块和多播重传模块：
多播存储模块： 实时获取网络侧传输来的多播视频流并存储；
多¾¾：传模块： 在接收到用广终端的重传丢失多播视频报文请求后， 根据所述丢失 的信息将多播存储模块中存储的对应多播视频报文以 播方式通过其所在的宽带接入 设备传输^用户终端。
5、 如权利要求 1至 4所述的任一权利要求所述的一种宽带接入设备， 其特征在于， 所述宽带接入设备还设置有： 视频服务单元访问控制桉块；
视频服务单 访问控制模块： 获取用户终端的接入权限信息， 并裉据该接入权限信 息对用户终端进行视频服务 ^元的 控制。
6、 一种甚 :f宽带接入设备提供视频业务的网络系统， 其特征在于， 包括： 视频源、 服务网关、 内置有视频服务单元的宽带接入设备：
所述视频源将视频流传输至服务网关， 并由服务网关、 内赏有视频服务^元的宽带 接入设各将所述视频流传输至用户终端。
7、 - -种视频业务实现方法， 其特征在于， 包括：
a、 在宽带接入设备中内置视频服务单元： b、 所述视频服务单 根据用户终端的请求将艽存储的视频业务通过其所在的宽带 接入设备传输至用户终端。
8、 如权利要求 7所述的一种视频业务实现方法， 其特祉在于， 所述宽带接入设备 包括： 数 用户线接入复接器。
9、 如权利要求 7所述的一种视频业务实现方法， 其特征在于， 所述步骤 b中的视 频业务包括： 单播视频业务和 /或多播视频业务；
且所述 骤 b具体包括- 所述视频服务单元根据川户终端的单播视频业务请求将其存储的对应的舉播视频 业务通过 K所在的宽带接入设备传输至用户终端： 和 /或
所述视频服务单元实时获取网络侧传输来的多播视频流并存储；
所述视频服务单元在接收到川户终端的 S传 ΐ失多播视频报文请求时， 根据所述丢 失的信息将其存储的对应的多檷视频报文以单播方式通过其所在的宽带挠入设备传输 至用户终端。
10、如权利要求 7所述的 种视频业务¾现方法， ： Κ·特征在于，所述歩骤 b还包括： 视频服务单元在接收到用户终端的重传丢失多播视频报文请求时， 根据所述丟失的 佶息将其存储的对应的^播视频报文通过其所在的宽带接入设备传输至用户终端。
1 K 如权利要求 7至】0所述的任 -权剁^求所述的一种视频业务实现方法， 其特 征在于， 所述步骤 b之前还包括：
根据用户终端的接入权限信总确定允许访问视频服务单元的用户终端；
且所述步骤 b中发送请求的用户终端为： 允许访问视频服务单元的用户终端。
PCT/CN2006/001896 2005-07-29 2006-07-28 Moyen d'acces haut debit et application de celui-ci WO2007012287A1 (fr)

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CA002617141A CA2617141A1 (en) 2005-07-29 2006-07-28 Broadband access equipment and method for implementing video service
CNA2006800121902A CN101160964A (zh) 2005-07-29 2006-07-28 一种宽带接入设备及其应用
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