WO2012103726A1 - 基于ott的媒体数据传输方法、装置及系统 - Google Patents

基于ott的媒体数据传输方法、装置及系统 Download PDF

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Publication number
WO2012103726A1
WO2012103726A1 PCT/CN2011/076626 CN2011076626W WO2012103726A1 WO 2012103726 A1 WO2012103726 A1 WO 2012103726A1 CN 2011076626 W CN2011076626 W CN 2011076626W WO 2012103726 A1 WO2012103726 A1 WO 2012103726A1
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WO
WIPO (PCT)
Prior art keywords
media data
server
ott
user terminal
cache server
Prior art date
Application number
PCT/CN2011/076626
Other languages
English (en)
French (fr)
Inventor
刘济涛
郑合文
陈海斌
宗宁
吴钦
Original Assignee
华为技术有限公司
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 华为技术有限公司 filed Critical 华为技术有限公司
Priority to EP15151661.4A priority Critical patent/EP2892209B1/en
Priority to CN2011800009246A priority patent/CN102292959B/zh
Priority to EP11857476.3A priority patent/EP2717540B1/en
Priority to ES15151661.4T priority patent/ES2612714T3/es
Priority to PCT/CN2011/076626 priority patent/WO2012103726A1/zh
Priority to ES11857476.3T priority patent/ES2539259T3/es
Publication of WO2012103726A1 publication Critical patent/WO2012103726A1/zh
Priority to US14/140,176 priority patent/US9729595B2/en

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Classifications

    • 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
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L67/00—Network arrangements or protocols for supporting network services or applications
    • H04L67/50—Network services
    • H04L67/56—Provisioning of proxy services
    • H04L67/568—Storing data temporarily at an intermediate stage, e.g. caching
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L65/00—Network arrangements, protocols or services for supporting real-time applications in data packet communication
    • H04L65/60—Network streaming of media packets
    • H04L65/61—Network streaming of media packets for supporting one-way streaming services, e.g. Internet radio
    • H04L65/612—Network streaming of media packets for supporting one-way streaming services, e.g. Internet radio for unicast
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L67/00—Network arrangements or protocols for supporting network services or applications
    • H04L67/01—Protocols
    • H04L67/10—Protocols in which an application is distributed across nodes in the network
    • H04L67/1001—Protocols in which an application is distributed across nodes in the network for accessing one among a plurality of replicated servers
    • H04L67/1004—Server selection for load balancing
    • H04L67/1008—Server selection for load balancing based on parameters of servers, e.g. available memory or workload
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L67/00—Network arrangements or protocols for supporting network services or applications
    • H04L67/01—Protocols
    • H04L67/10—Protocols in which an application is distributed across nodes in the network
    • H04L67/1001—Protocols in which an application is distributed across nodes in the network for accessing one among a plurality of replicated servers
    • H04L67/1004—Server selection for load balancing
    • H04L67/1021—Server selection for load balancing based on client or server locations

Definitions

  • the present invention relates to the field of communications technologies, and in particular, to an OTT-based media data transmission method, apparatus, and system.
  • OTT (Over The Top) refers to services that rely on the Internet to provide services, that is, users access services through broadband Internet access.
  • OTT on-demand services have become the mainstay of network traffic.
  • the prior art reduces traffic pressure on the bearer network through traffic grooming.
  • the traffic and flow direction of the commercial CDN are not under the control of the operator.
  • the operator mainly implements the OTT traffic through the self-built transparent cache system. Localization.
  • the transparent cache system caches the media data from the server response, and then receives the user's subsequent request for the content, directly obtains the corresponding content response user from the transparent cache system, and does not need to request the content from the server providing the service, thereby saving Transparently cache network traffic between the system and the server.
  • the user terminal 1 requests media data from the OTT server, and the request is forwarded to the server via an intermediate network device (service POP), and the network device embeds a transparent cache system; when a subsequent request occurs, The network device redirects the request packet for the OTT server to the embedded transparent cache system.
  • the network device After the transparent cache system finds that there is no content requested by the user terminal 1 , the network device sends a request packet to the OTT server.
  • the provided media data response is sent to the user terminal 1; when the user terminal 2 (end user 2) requests the OTT server to redirect the message of the same content to the transparent cache system by the network device, the transparent cache system directly uses the cached content. Answer user terminal 2 (end user 2).
  • the access service of the user terminal is terminated by the transparent cache system and cannot reach the OTT server. Therefore, the OTT service provider cannot collect the access status of the user terminal to the media data, for example, the number of accesses and the access time, etc.;
  • the access request of the terminal is directly acknowledged by the transparent cache system, and the corresponding access request cannot reach the OTT server, so that the OTT service provider cannot control the access content, and the transparent cache system also has a security risk of being attacked by a large number of requests.
  • the embodiment of the invention provides a method, a device and a system for transmitting media data based on OTT, which can improve the controllability of the media server for media data request and content transmission.
  • An embodiment of the present invention provides a media data transmission method based on an OTT layer on the Internet, where the method includes:
  • the OTT server receives a media data request initiated by the user terminal, where the OTT server is connected to at least one cache server;
  • OTT server Determining, by the OTT server, a cache server from the at least one cache server according to the location and/or capability of the at least one cache server;
  • the OTT server sends a notification message carrying the session information to the user terminal and the determined cache server; so that the determined cache server receives the media data request from the user terminal that carries the session information, and Transmitting corresponding media data to the user terminal.
  • An OTT server where the OTT server is connected to at least one cache server, where the OTT server includes:
  • a first port configured to receive a media data request of the user terminal
  • a determining unit configured to determine a cache server from the at least one cache server according to the location and/or capability of the at least one cache server;
  • a second port configured to send a notification message carrying the session information to the determined cache server and the user terminal.
  • a cache server is connected to an OTT server on the Internet, and the cache server includes:
  • a network side interface unit configured to receive a notification message carrying session information from the OTT server
  • a first user side interface unit configured to receive a media data request carrying session information from the user terminal
  • control unit configured to compare session information from the OTT with session information from the user terminal
  • a second user side interface unit configured to use session information from the OTT and the user When the session information of the terminal matches, the corresponding media data is sent to the user terminal.
  • An OTT-based media data transmission system includes: a user terminal, an OTT server, and at least one cache server; wherein
  • the OTT server is configured to receive a media data request initiated by the user terminal, determine a cache server from the at least one cache server according to the location and/or capability of the at least one cache server, and send a session information carrying the session information. Notifying a message to the user terminal and the determined cache server;
  • the cache server is configured to receive a media data request from the user terminal that carries the session information, and send corresponding media data to the user terminal.
  • the media data request initiated by the user terminal is firstly located to the OTT server, so that the OTT server can select the corresponding cache server for the specific user to push the media data. Then, the user terminal is redirected to the cache server by controlling the user terminal. Initiating a media data request carrying specific session information, and the cache server pushes the media data to the user terminal according to the request, so that the OTT server can monitor each media data request of the user terminal, thereby implementing each media data request for the user terminal. Control to improve controllability of media data transmission.
  • FIG. 1 is a schematic diagram of a scenario in which a user terminal accesses an OTT server to request media data in the prior art
  • FIG. 2 is a schematic flowchart of a method for transmitting media data based on OTT according to an embodiment of the present invention
  • FIG. 3 is a schematic diagram of an application scenario of a user terminal accessing a YouKu website according to an embodiment of the present invention
  • FIG. 4 is a schematic flowchart of a data transmission performed by an OTT server of a YouKu website according to a media data request initiated by a user according to an embodiment of the present invention
  • FIG. 5 is a schematic structural diagram of an OTT-based media data transmission system according to an embodiment of the present disclosure
  • FIG. 6 is a schematic structural diagram of an OTT server according to an embodiment of the present disclosure.
  • FIG. 7 is a schematic structural diagram of another OTT server according to an embodiment of the present disclosure.
  • FIG. 8 is a schematic structural diagram of a cache server according to an embodiment of the present invention.
  • An embodiment of the present invention provides an OTT-based media data transmission method. As shown in FIG. 2, the method may include the following steps:
  • Step 201 The OTT server receives a media data request initiated by the user terminal.
  • the OTT server is connected to a cache server, and the cache server embeds a cache system and stores related media data, which may be sent by the OTT server.
  • the cache server needs to register its own location and capabilities (such as the covered end user subnet, supported streaming protocols, storage capacity, etc.) to the OTT server; in addition, the registration service can also be first served by service POP >3 ⁇ 4
  • the operator management system summarizes and the operator management system informs the OTT server.
  • Step 202 The OTT server determines a cache server that sends related media data to the user terminal, and sends a notification message carrying the session information to the user terminal and the determined cache server.
  • the OTT server determines a cache server that sends relevant media data to the user terminal.
  • the selection criterion of the cache server may be: Cache server access location, near selection; or according to the ability of the cache server to provide data services, select the appropriate server for media data distribution.
  • the OTT server In order to improve the controllability of the OTT server for the media data request and the content transmission, the OTT server generates the corresponding session information according to the media data request initiated by the current user terminal, and the session information may specifically include: Sexual user identification, session identification describing the validity of the billing, content identification describing the validity of the copyright license, copyright information describing the copyright control method, billing information describing the billing mode, and description of the feedback information after the end of the media data service A combination of one or more of the information describing the status of the user requesting access to the license and the number of concurrent connections.
  • the OTT server After the session information is generated, the OTT server sends a notification message carrying the session information of the foregoing information to the user terminal and the determined cache server, to notify the user terminal that the media data request carrying the session information needs to be re-initiated to the cache server, and The cache server sends anything to it The user terminal that requests the media data must carry the above session information.
  • Step 203 The user terminal sends a media data request carrying the session information to the determined cache server, and receives media data returned by the determined cache server.
  • the user terminal After receiving the notification message, the user terminal re-initiates a media data request carrying the session information to the determined cache server, and the cache server sends the relevant media data to the user terminal according to the media data request.
  • the media data request initiated by the user terminal is firstly located to the OTT server, so that the OTT server can select the corresponding cache server for the specific user to push the media data. Then, the user terminal is redirected to the cache server by controlling the user terminal. Initiating a media data request carrying specific session information, and the cache server pushes the media data to the user terminal according to the request, so that the OTT server can monitor each media data request of the user terminal, thereby implementing each media data request for the user terminal. Control to improve controllability of media data transmission.
  • the OTT server can push related media data to a cache server through unicast.
  • the OTT server can push relevant media data to each cache server through multicast.
  • the OTT server after receiving the media data request initiated by the user terminal, the OTT server needs to perform authentication authentication on the user terminal to determine whether the media data request initiated by the user terminal can be accepted.
  • the corresponding authentication and authentication methods may include: firewall filtering and other anti-attack filtering security processing, user identity authentication, program selection and authorization, charging, etc., after the relevant authentication authentication is passed, the OTT server may determine that the media data request is If the request is legal, the subsequent session information is confirmed.
  • the authentication mode may be: comparing the session information carried in the media data request of the user terminal with the session message carried in the notification message from the OTT server, and if the content matches, the user is considered to be in the permitted access time. If the user terminal is a legitimate user and is permitted to provide the media data service to the user, the user terminal is sent to the user according to the request of the user terminal. Media data.
  • the cache server reports the related statistical information of the current media data transmission to the OTT server, such as accessing. Duration, frequency of visits, average bandwidth, traffic statistics, and quality statistics.
  • the cache server ends the transmission of the media data service to the user terminal, the user terminal stops acquiring the corresponding media data; or, due to a network failure or the like, the user terminal disconnects the network connection with the cache server, so that The user terminal stops acquiring corresponding media data.
  • the related information of the current media data transmission may be reported by the cache server to the OTT server when the user terminal stops acquiring the corresponding media data; or after the user terminal stops acquiring the corresponding media data, the timing may be
  • the information about the current media data transmission is reported by the cache server to the OTT server, which is not limited by the embodiment of the present invention, and may be set according to an actual application scenario.
  • FIG. 3 illustrates an application scenario of the OTT-based media data transmission by taking an application scenario in which the user terminal accesses the website as an example.
  • the OTT server is a server that provides a video service by a website service provider (including: a home frame server, a program management server, a user authentication server, a billing server, a content storage server, an advertisement decision server, an advertisement storage server, etc.).
  • the OTT server is connected to an intermediate network device (service POP), that is, a cache server, and the network device has a cache system embedded therein.
  • the cache server service POP registers its own location and capabilities (such as the covered terminal subnet, supported streaming protocol, storage capacity, etc.) to the OTT server, so that the OTT server knows the parameter information of the cache server.
  • the registration can also be summarized by the service POP>3 ⁇ 4 to the operator management system, and then the operator management system informs the website service provider of the OTT server;
  • the OTT server can connect multiple service POPs at the same time;
  • the OTT server pushes the corresponding media data to the service by multicast or unicast.
  • POP The end user initiates a media data request to the OTT server, where the request is directly directed to the OTT server.
  • the OTT server After receiving the media data request initiated by the end user, the OTT server performs security processing such as firewall filtering and attack filtering, user authentication, program selection, authorization, and accounting, and performs authentication and authentication on the current end user.
  • security processing such as firewall filtering and attack filtering, user authentication, program selection, authorization, and accounting, and performs authentication and authentication on the current end user.
  • the OTT server selects a service POP corresponding to providing the media data content for the end user based on the access location of the service POP or the capability of providing the data service;
  • the OTT server generates corresponding session information according to the media data request initiated by the current user terminal, where the session information may specifically include: a user identifier describing the validity of the user, a session identifier describing the validity of the billing, and a content identifier describing the validity of the copyright license. , the copyright information describing the copyright control mode, the charging information describing the charging mode, the feedback information requirement after describing the end of the media data service, the status duration describing the user requesting access, and the number of concurrent connections.
  • the above session information may be transmitted in plain text or in a contracted format using a secure, unique identifier;
  • the OTT server sends a notification message carrying the foregoing session information to the service POP to notify the service POP: the user request in the duration of the user permission access state specified by the session information is valid in time; carrying the session information specified The user request of the user identifier is valid on the user identity; the user request carrying the session identifier specified by the session information is valid on the billing information; the user requesting the content identifier specified by the session information is requested to be in the content copyright access.
  • Valid Only when these validityes are confirmed, the end user's access request can be accepted and serviced by the service POP;
  • the OTT server sends a notification message carrying the foregoing session information to the end user, to notify the end user that the media data request carrying the session information needs to be re-initiated to the corresponding service POP, and the end user is redirected to the service POP to obtain the media content.
  • the session information carries the IP address and/or URI (Uniform Resource Identifier) of the corresponding service POP.
  • URI Uniform Resource Identifier
  • the end user initiates, to the OTT server, a media data request that carries the session information. 5408.
  • the service POP compares the session information carried in the media data request initiated by the OTT server and the media data request initiated by the end use in step S405. If the two match, the end user is authenticated and authorized by the OTT server. Specified content;
  • the media data content requested by the end user is transmitted from the service POP to the end user, and the service POP performs corresponding accounting and access information statistics according to the policy provided by the OTT server.
  • the service POP terminates the charging and reports the accounting information and the statistics of the end user access, for example: Access duration, frequency of access, average bandwidth, traffic statistics, and quality statistics.
  • the OTT server enables the OTT server to select a corresponding cache server for the specific user to push the media data. Then, by controlling the user terminal to re-initiate the media data request carrying the specific session information to the cache server, the cache server requests the user according to the request. The terminal pushes the media data, so that the OTT server can monitor each media data request of the user terminal, thereby implementing control for each media data request of the user terminal, and improving controllability of media data transmission.
  • the OTT server first performs content access control operations such as security filtering and signing authentication processing on the user, and the cache server only needs to compare whether the session information carried by the user matches the session information from the OTT server to complete the content. Access control, thereby solving the security risk of the cache server being attacked by a large number of requests;
  • the technical solution can Solve the OTT service provider
  • the embodiment of the present invention further provides an OTT-based media data transmission system.
  • the system may specifically include: a user terminal 501, an OTT server 502, and at least one cache server 503, a cache server 503 and
  • the OTT server 502 is connected, and has a cache system embedded therein and stored with media data;
  • the OTT server 502 is configured to receive a media data request initiated by the user terminal 501. Determining, from the at least one cache server, a cache server 503 that sends relevant media data to the user terminal 501 according to the location and/or capability of the at least one cache server, and transmitting a notification message carrying the session information to the user terminal 501 And corresponding cache server 503;
  • the cache server 503 is configured to receive a media data request from the user terminal 501 that carries the session information, and send corresponding media data to the user terminal 501.
  • the cache server needs to register its own location and capabilities (such as the covered end user subnet, supported streaming protocols, storage capacity, etc.) to the OTT server.
  • the OTT server After the OTT server receives the media data request initiated by the user terminal, if the media data request of the user terminal is accepted, the OTT server determines a cache server that generates relevant media data to the user terminal, and in the specific implementation process, the cache server is selected.
  • the benchmark can be: according to the access location of the cache server, the nearest selection; or according to the ability of the cache server to provide data services, select an appropriate server for media data distribution.
  • the OTT server In order to improve the controllability of the OTT server for the media data request and the content transmission, the OTT server generates the corresponding session information according to the media data request initiated by the current user terminal, and the session information may specifically include: Sexual user identification, session identification describing the validity of the billing, content identification describing the validity of the copyright license, copyright information describing the copyright control method, billing information describing the billing mode, and description of the feedback information after the end of the media data service A combination of one or more of a status duration and a number of concurrent connections that the user requests to be granted access.
  • the OTT server After the session information is generated, the OTT server sends a notification message carrying the session information of the foregoing information to the user terminal and the determined cache server, to notify the user terminal that the media data request carrying the session information needs to be re-initiated to the cache server, and Any user terminal to which the cache server initiates a media data request must carry the above session information.
  • the user terminal After receiving the notification message, the user terminal re-initiates a media data request carrying the session information to the cache server, and the cache server sends relevant media data to the user terminal according to the media data request.
  • the media data request initiated by the user terminal is firstly located to the OTT server, so that the OTT server can select the corresponding cache server for the specific user to push the media data; and then, by controlling the user terminal, Initiating a media data request carrying specific session information to the cache server, and the cache server pushes the media to the user terminal according to the request.
  • the OTT server can monitor each media data request of the user terminal, thereby implementing control of each media data request for the user terminal, and improving controllability of media data transmission.
  • the server can push related media data to a cache server through unicast.
  • the server can push relevant media data to each cache server through multicast.
  • the server needs to perform authentication authentication on the user terminal to determine whether the media data request initiated by the user terminal can be accepted.
  • the cache server On the cache server side, after the cache server receives the notification message carrying the session information sent by the server, the session information is stored. After receiving the media data request initiated by the user terminal and carrying the corresponding session information, the server still needs to The user terminal is authenticated. Comparing the received session information carried in the media data request initiated by the user terminal with the session message carried in the notification message received by the user terminal, if the content matches, that is, the user is licensed within the permitted access time. If the user terminal is a legitimate user and is permitted to provide the media data service to the access request within the range of the number of permitted connections of the content source, the corresponding media data is sent to the user terminal according to the request of the user terminal.
  • the cache server reports the related statistical information of the current media data transmission to the server.
  • the embodiment of the present invention further provides a ⁇ server. As shown in FIG. 6, the server may specifically include:
  • a determining unit 602 configured to determine, according to the location and/or capability of the at least one cache server, a cache server from the at least one cache server;
  • the second port 603 is configured to send a notification message carrying the session information to the determined cache server and the user terminal.
  • the UI server provided in this embodiment may further include a charging unit 604, A port 601 is further configured to receive statistical information from the cache server, and the charging unit 604 is configured to perform charging on the user terminal according to the statistical information.
  • the embodiment of the present invention further provides a cache server, where the cache server is connected to the OTT server.
  • the cache server includes:
  • the network side interface unit 801 is configured to receive a notification message carrying session information from the OTT server.
  • the first user side interface unit 802 is configured to receive a media data request carrying session information from the user terminal;
  • Control unit 803 configured to compare session information from the OTT with session information from the user terminal;
  • the second user side interface unit 804 is configured to send corresponding media data to the user terminal when the session information from the OTT matches the session information from the user terminal.
  • the description is relatively simple, and the relevant parts can be referred to the description of the method embodiments.
  • the system embodiments described above are merely illustrative, wherein the modules described as separate components may or may not be physically separate, and the components displayed as modules may or may not be physical modules, ie may be located One place, or it can be distributed to multiple network modules. Some or all of the modules may be selected according to actual needs to achieve the objectives of the solution of the embodiment. Those of ordinary skill in the art can understand and implement without any creative effort.

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  • Computer Networks & Wireless Communication (AREA)
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Abstract

一种基于OTT的媒体数据传输方法、装置及系统，其中，所述方法包括：OTT服务器接收用户终端发起的媒体数据请求，所述OTT服务器连接有至少一个缓存服务器；所述OTT服务器根据所述至少一个缓存服务器的位置和/或能力从所述至少一个缓存服务器中确定一个缓存服务器；所述OTT服务器发送携带有会话信息的通知消息至所述用户终端及所确定的缓存服务器；以便于所述确定的缓存服务器接收来自所述用户终端的携带所述会话信息的媒体数据请求，并向所述用户终端发送相应媒体数据。通过本发明实施例，能够提高OTT服务器对媒体数据请求及内容传输的可控性。

Description

基于 OTT的媒体数据传输方法、 装置及系统 技术领域
本发明涉及通信技术领域，尤其涉及一种基于 OTT的媒体数据传输方法、 装置及系统。
背景技术
OTT ( Over The Top,在 Internet上层）是指依靠 Internet提供业务的服务， 即用户通过宽带上网获取服务。 目前， OTT点播服务已成为网络流量的主体。
伴随着 OTT点播服务数量的增长， 现有技术通过流量疏导来降低流量对 承载网产生的压力。考虑到当前 OTT视频主要通过商业 CDN( Content Delivery Network, 内容分发网络）分发， 而商业 CDN的流量、 流向不在运营商控制之 中， 为此， 运营商主要通过自建透明緩存系统实现 OTT流量的本地化。
透明緩存系统会緩存来自服务器应答的媒体数据，然后在收到用户后续针 对该内容的请求的时候， 直接从透明緩存系统获取相应内容应答用户， 无需再 向提供服务的服务器请求内容，从而节省从透明緩存系统到服务器之间的网络 流量。
如图 1所示， 用户终端 l(end user 1)向 OTT服务器请求媒体数据， 该请求 途经中间网络设备 (service POP)转发给服务器，该网络设备内嵌透明緩存系统； 当发生后续请求时， 网络设备就会把针对 OTT服务器的请求报文重定向到内 嵌的透明緩存系统上去，透明緩存系统发现本地没有用户终端 1所请求的内容 后， 即向 OTT服务器发送请求报文， 将 OTT服务器提供的媒体数据应答发送 给用户终端 1; 当用户终端 2(end user 2)向 OTT服务器请求同一个内容的报文 被网络设备重定向到透明緩存系统后，透明緩存系统直接采用緩存的内容来应 答用户终端 2(end user 2)。
由于用户终端的访问事务会被透明緩存系统终结， 而无法到达 OTT服务 器， 因此， 导致 OTT服务提供方无法统计用户终端对媒体数据的访问状况， 例如： 访问次数和访问时间等； 此外， 由于用户终端的访问请求直接被透明緩 存系统应答， 相应访问请求将无法到达 OTT服务器， 致使 OTT服务提供方无 法对访问内容进行控制， 而透明緩存系统也存在被海量请求攻击的安全风险。 发明内容
本发明实施例提出一种基于 OTT的媒体数据传输方法、 装置及系统， 能 够提高 ΟΤΤ服务器对媒体数据请求及内容传输的可控性。
本发明的技术解决方案是：
本发明实施例提供一种基于在 Internet上层 OTT的媒体数据传输方法，所 述方法包括：
OTT服务器接收用户终端发起的媒体数据请求， 所述 OTT服务器连接有 至少一个緩存服务器；
所述 OTT服务器根据所述至少一个緩存服务器的位置和 /或能力从所述至 少一个緩存服务器中确定一个緩存服务器；
所述 OTT服务器发送携带有会话信息的通知消息至所述用户终端及所确 定的緩存服务器；以便于所述确定的緩存服务器接收来自所述用户终端的携带 所述会话信息的媒体数据请求， 并向所述用户终端发送相应媒体数据。
一种 OTT服务器， 所述 OTT服务器与至少一个緩存服务器相连， 所述 OTT服务器包括：
第一端口， 用于接收用户终端的媒体数据请求；
确定单元， 用于根据所述至少一个緩存服务器的位置和 /或能力从所述至 少一个緩存服务器中确定一个緩存服务器；
第二端口，用于向所述确定的緩存服务器以及所述用户终端发送携带会话 信息的通知消息。
一种緩存服务器，所述緩存服务器和在 Internet上层 OTT服务器相连，所 述緩存服务器包括：
网络侧接口单元， 用于接收来自所述 OTT服务器的携带有会话信息的通 知消息；
第一用户侧接口单元，用于接收来自用户终端的携带有会话信息的媒体数 据请求；
控制单元， 用于将来自所述 OTT的会话信息与来自所述用户终端的会话 信息进行比较；
第二用户侧接口单元， 用于在来自所述 OTT的会话信息与来自所述用户 终端的会话信息匹配时， 向所述用户终端发送相应的媒体数据。
一种基于 OTT的媒体数据传输系统， 包括： 用户终端、 OTT服务器以及 至少一个緩存服务器； 其中，
所述 OTT服务器， 用于接收所述用户终端发起的媒体数据请求， 根据所 述至少一个緩存服务器的位置和 /或能力从所述至少一个緩存服务器中确定一 个緩存服务器，发送携带有会话信息的通知消息至所述用户终端及所述确定的 緩存服务器；
所述緩存服务器，用于接收来自所述用户终端的携带所述会话信息的媒体 数据请求， 并向所述用户终端发送相应媒体数据。
本发明实施例中， 由于将用户终端发起的媒体数据请求首先定位至 OTT 服务器， 使得 OTT服务器能够针对具体的用户选择相应的緩存服务器进行媒 体数据的推送； 然后，通过控制用户终端重新向緩存服务器发起携带特定会话 信息的媒体数据请求， 由緩存服务器根据该请求向用户终端推送媒体数据，从 而， OTT服务器可以监测到用户终端的每次媒体数据请求， 从而实现针对用 户终端的每次媒体数据请求进行控制， 提高对媒体数据传输的可控性。
附图说明
图 1为现有技术中用户终端访问 OTT服务器请求媒体数据的场景示意图； 图 2为本发明实施例提供的一种基于 OTT的媒体数据传输方法流程示意 图；
图 3为本发明实施例提供的用户终端访问 YouKu网站的应用场景示意图； 图 4为本发明实施例提供的 YouKu网站的 OTT服务器根据用户发起的媒 体数据请求向其进行数据传输的流程示意图；
图 5为本发明实施例提供的一种基于 OTT的媒体数据传输系统结构示意 图；
图 6为本发明实施例提供的一种 OTT服务器结构示意图；
图 7为本发明实施例提供的另一种 OTT服务器结构示意图；
图 8为本发明实施例提供的一种緩存服务器结构示意图。
具体实施方式
下面将结合本发明实施例中的附图，对本发明实施例中的技术方案进行清 楚、 完整的描述， 显然， 所描述的实施例仅仅是本发明一部分实施例， 而不是 全部的实施例。基于本发明中的实施例， 本领域普通技术人员在没有做出创造 性劳动前提下所获得的所有其他实施例， 都属于本发明保护的范围。
本发明实施例提供了一种基于 OTT的媒体数据传输方法， 如图 2所示， 所述方法可以包括以下步骤：
步骤 201、 OTT服务器接收用户终端发起的媒体数据请求；
所述 OTT服务器连接緩存服务器， 緩存服务器内嵌緩存系统且存储相关 媒体数据， 该媒体数据可以由 OTT服务器发送而来。
通常，緩存服务器需要注册自己的位置和能力（如所覆盖的终端用户子网、 所支持的流化协议、 存储容量等）到 OTT服务器； 此外， 该注册业务也可以 先由 service POP上 >¾到运营商管理系统进行汇总， 再由该运营商管理系统告 知 OTT服务器。
步骤 202、 OTT服务器确定向所述用户终端发送相关媒体数据的緩存服务 器， 并发送携带有会话信息的通知消息至所述用户终端及确定的緩存服务器； 本发明实施例中， 当 OTT服务器接收到用户终端发起的媒体数据请求之 后， 如果该用户终端的媒体数据请求被接纳， 则 OTT服务器确定向该用户终 端发送相关媒体数据的緩存服务器， 具体实施过程中，緩存服务器的选择基准 可以是： 根据緩存服务器的接入位置， 就近选择； 或是根据緩存服务器提供数 据服务的能力， 选择合适的服务器进行媒体数据的发放。
为了提高 OTT服务器对媒体数据请求及内容传输的可控性， OTT服务器 根据当前用户终端发起的媒体数据请求， 生成相应的会话信息，根据实际的应 用场景， 该会话信息具体可以包括： 描述用户有效性的用户标识、 描述计费有 效性的会话标识、描述版权许可有效性的内容标识、描述版权控制方式的版权 信息、 描述计费模式的计费信息、 描述媒体数据服务结束后的反馈信息需求、 描述用户请求被许可访问的状态持续时间和并发连接数目等信息中的一个或 多个的组合。
生成会话信息之后， OTT服务器发送携带上述信息的会话信息的通知消 息至用户终端和所确定的緩存服务器，以通知用户终端需要向该緩存服务器重 新发起携带所述会话信息的媒体数据请求，并且告知该緩存服务器任何向其发 起媒体数据请求的用户终端都必须携带上述会话信息。
步骤 203、 所述用户终端向所述确定的緩存服务器发送携带所述会话信息 的媒体数据请求， 接收由所述确定的緩存服务器返回的媒体数据。
用户终端接收到通知消息之后，重新向确定的緩存服务器发起携带所述会 话信息的媒体数据请求， 而緩存服务器则根据这一媒体数据请求， 向该用户终 端发送相关媒体数据。
本发明实施例中， 由于将用户终端发起的媒体数据请求首先定位至 OTT 服务器， 使得 OTT服务器能够针对具体的用户选择相应的緩存服务器进行媒 体数据的推送； 然后，通过控制用户终端重新向緩存服务器发起携带特定会话 信息的媒体数据请求， 由緩存服务器根据该请求向用户终端推送媒体数据，从 而， OTT服务器可以监测到用户终端的每次媒体数据请求， 从而实现针对用 户终端的每次媒体数据请求进行控制， 提高对媒体数据传输的可控性。
在实际应用场景中， OTT服务器可以通过单播的方式， 将相关媒体数据 推送至某一緩存服务器。 当与 OTT服务器连接的緩存服务器有多个时， OTT 服务器可以通过组播的方式， 将相关媒体数据推送至每一个緩存服务器。
需要说明的是， 通常， OTT服务器接收到用户终端发起的媒体数据请求 之后， 需要对该用户终端进行鉴权认证， 以确定该用户终端发起的媒体数据请 求是否可以被接纳。相应的鉴权认证方式可以包括： 防火墙过滤等防攻击过滤 安全处理、 用户身份认证、 节目选择与授权、 计费等处理， 当相关的鉴权认证 通过之后， OTT服务器可以确定该媒体数据请求为合法请求， 则开始进行后 续会话信息的确认。
另外， 在緩存服务器一侧， 当緩存服务器接收到 OTT服务器发送的携带 会话信息的通知消息之后，对此会话信息进行存储， 当接收到用户终端发起的 携带相应会话信息的媒体数据请求之后，仍需要对该用户终端进行认证。此时 的认证方式可以为：将用户终端的媒体数据请求中携带的会话信息与来自 OTT 服务器的通知消息中携带的会话消息进行比较，如果二者内容匹配， 则认为用 户是在许可的访问时间内、对许可的内容源的许可连接数目范围内发起的访问 请求， 则可以确定该用户终端为合法用户， 且被许可向其提供媒体数据服务， 则根据该用户终端的请求， 向其发送相应的媒体数据。 为了进一步加强 0TT服务器对媒体数据请求及内容传输的可控性， 可在 用户终端停止获取相应媒体数据之后， 由所述緩存服务器向所述 OTT服务器 上报当前媒体数据传输的相关统计信息， 如访问时长、 访问频度、 平均带宽、 流量统计和质量统计等。这里， 当緩存服务器向该用户终端传送媒体数据服务 结束时， 该用户终端停止获取相应媒体数据； 此外， 也可能是由于网络故障等 原因，导致该用户终端断开与緩存服务器的网络连接，使得该用户终端停止获 取相应媒体数据。本发明实施例中， 可以在用户终端停止获取相应媒体数据的 时候由所述緩存服务器向所述 OTT服务器上报当前媒体数据传输的相关统计 信息； 也可以在用户终端停止获取相应媒体数据之后， 定时由所述緩存服务器 向所述 OTT服务器上报当前媒体数据传输的相关统计信息， 本发明实施例不 做任何限定， 具体可以根据实际应用场景进行设置。
为了便于对本发明实施例技术方案的充分理解，下面将结合本发明实施例 中的附图， 对本发明实施例中的技术方案进行清楚、 完整的描述。
图 3以用户终端访问网站的应用场景为例， 来说明上述基于 OTT的媒体 数据传输过程。
图 3 中， OTT服务器是网站服务提供商提供视频服务的服务器（包括： 主页框架服务器、 节目管理服务器、 用户认准服务器、 计费服务器、 内容存储 服务器、 广告决策服务器和广告存储服务器等）， 该 OTT服务器连接有中间网 络设备 (service POP) , 即緩存服务器， 该网络设备内嵌緩存系统。
网站的 ΟΤΤ服务器根据用户发起的媒体数据请求向其进行数据传输的具 体过程参见图 4所示， 具体包括以下步骤：
S401、 緩存服务器 service POP注册自己的位置和能力 （如所覆盖的终端 用户子网、 所支持的流化协议、 存储容量等）到 OTT服务器， 使得 OTT服务 器获知緩存服务器的各项参数信息；
当然， 该注册也可以先由 service POP上>¾到运营商管理系统汇总， 然后 由运营商管理系统告知网站服务提供商提供的 OTT服务器；
此外， 通常， OTT服务器可以同时连接多个 service POP;
S402、 OTT服务器将相应媒体数据通过组播或单播方式推送到 service
POP; 5403、 用户终端 (end user)向 OTT服务器发起媒体数据请求， 该请求被直 接定向至 OTT服务器；
5404、 OTT服务器接收到 end user发起的媒体数据请求后， 进行防火墙过 滤防攻击过滤等安全处理、 用户认证、 节目选择与授权、 计费等处理， 对当前 end user进行鉴权认证；
如果当前 end user发起的媒体数据请求被 OTT服务器接纳， 则 OTT服务 器基于 service POP的接入位置或提供数据服务的能力， 为 end user选择相应 提供媒体数据内容的 service POP;
OTT服务器根据当前用户终端发起的媒体数据请求， 生成相应的会话信 息， 该会话信息具体可以包括： 描述用户有效性的用户标识、 描述计费有效性 的会话标识、描述版权许可有效性的内容标识、描述版权控制方式的版权信息、 描述计费模式的计费信息、描述媒体数据服务结束后的反馈信息需求、描述用 户请求被许可访问的状态持续时间和并发连接数目中的一个或多个的组合； 具体实施时， 上述会话信息可以采用明文描述或采用约定格式使用安全、 唯一的标识加密后进行传送；
5405、 OTT服务器发送携带上述会话信息的通知消息至 service POP, 以 告知该 service POP: 在该会话信息指定的用户许可访问状态持续时间内的用 户请求是时间上有效的；携带该会话信息指定的用户标识的用户请求在用户身 份上是有效的；携带该会话信息指定的会话标识的用户请求在计费信息上是有 效的；携带该会话信息指定的内容标识的用户请求在内容版权访问上是有效的: 只有当这些有效性均被确认， 该终端用户的访问请求才能被 service POP接纳 并提供服务；
5406、 OTT服务器发送携带上述会话信息的通知消息至 end user, 以通知 end user需要向对应的 service POP重新发起携带上述会话信息的媒体数据请 求， 将 end user重定向到 service POP获取媒体内容；
会话信息中携带有对应的 service POP 的 IP 地址和 /或 URI(Uniform Resource Identifier, 通用资源标识符)， end user 收到会话信息后，可以根据携带 的对应的 service POP的 IP地址和 /或 URI定位到对应的 service POP。
5407、 end user向 OTT服务器发起携带上述会话信息的媒体数据请求； 5408、 service POP根据步骤 S405中来自 OTT服务器的会话信息和 end use 发起的媒体数据请求中携带的会话信息进行比较， 如果两者匹配， 即验证 end user是 OTT服务器认可的合法用户且被许可提供指定的内容；
5409、 end user请求的媒体数据内容从 service POP传输到 end user, service POP按照 OTT服务器提供的策略进行相应计费和访问信息统计；
5410、 当 end user终止获取相应媒体数据 （如内容传送结束或 end user和 service POP之间网络连接断开）之后， service POP终止计费并上报计费信息 和 end user访问的统计信息， 例如： 访问时长、 访问频度、 平均带宽、 流量统 计和质量统计等。
通过上述实施例可见， 由于将用户终端发起的媒体数据请求首先定位至
OTT服务器， 使得 OTT服务器能够针对具体的用户选择相应的緩存服务器进 行媒体数据的推送； 然后，通过控制用户终端重新向緩存服务器发起携带特定 会话信息的媒体数据请求， 由緩存服务器根据该请求向用户终端推送媒体数 据， 从而， OTT服务器可以监测到用户终端的每次媒体数据请求， 从而实现 针对用户终端的每次媒体数据请求进行控制， 提高对媒体数据传输的可控性。
本发明实施例中， 由于 OTT服务器先对用户进行诸如安全过滤、 签权认 证处理等内容访问控制工作， 緩存服务器仅需比较用户携带的会话信息是否 与来自 OTT服务器的会话信息匹配即可完成内容访问控制， 从而解决了緩存 服务器被海量请求攻击的安全风险；
此外， 由于所有的用户访问请求都会到达 OTT服务器以及所有的会话统 计信息如访问时长、 访问频度、 平均带宽、 流量统计和质量统计等都会由緩存 服务器通告给 OTT服务器， 因此， 该技术方案能够解决 OTT服务提供商在透
相应地， 本发明实施例还提供了一种基于 OTT的媒体数据传输系统， 如 图 5所示， 该系统具体可以包括： 用户终端 501、 OTT服务器 502以及至少一 个緩存服务器 503 , 緩存服务器 503与 OTT服务器 502相连， 且内嵌有緩存 系统以及存储有媒体数据； 其中，
所述 OTT服务器 502用于接收所述用户终端 501发起的媒体数据请求； 根据所述至少一个緩存服务器的位置和 /或能力从至少一个緩存服务器中确定 向所述用户终端 501发送相关媒体数据的緩存服务器 503 , 并发送携带有会话 信息的通知消息至所述用户终端 501及相应緩存服务器 503;
所述緩存服务器 503用于接收来自所述用户终端 501的携带所述会话信息 的媒体数据请求， 并向所述用户终端 501发送相应媒体数据。
通常，緩存服务器需要注册自己的位置和能力（如所覆盖的终端用户子网、 所支持的流化协议、 存储容量等）到 OTT服务器。
当 OTT服务器接收到用户终端发起的媒体数据请求之后， 如果该用户终 端的媒体数据请求被接纳， 则 OTT服务器确定向该用户终端发生相关媒体数 据的緩存服务器， 具体实施过程中， 緩存服务器的选择基准可以是： 根据緩存 服务器的接入位置， 就近选择； 或是根据緩存服务器提供数据服务的能力， 选 择合适的服务器进行媒体数据的发放。
为了提高 OTT服务器对媒体数据请求及内容传输的可控性， OTT服务器 根据当前用户终端发起的媒体数据请求， 生成相应的会话信息，根据实际的应 用场景， 该会话信息具体可以包括： 描述用户有效性的用户标识、 描述计费有 效性的会话标识、描述版权许可有效性的内容标识、描述版权控制方式的版权 信息、 描述计费模式的计费信息、 描述媒体数据服务结束后的反馈信息需求、 描述用户请求被许可访问的状态持续时间和并发连接数目中的一个或多个的 组合。
生成会话信息之后， OTT服务器发送携带上述信息的会话信息的通知消 息至用户终端和所确定的緩存服务器，以通知用户终端需要向该緩存服务器重 新发起携带所述会话信息的媒体数据请求，并且告知该緩存服务器任何向其发 起媒体数据请求的用户终端都必须携带上述会话信息。该用户终端接收到这一 通知消息之后， 重新向该緩存服务器发起携带所述会话信息的媒体数据请求， 而緩存服务器则根据这一媒体数据请求， 向该用户终端发送相关媒体数据。
可见， 本发明实施例系统中， 由于将用户终端发起的媒体数据请求首先定 位至 OTT服务器，使得 OTT服务器能够针对具体的用户选择相应的緩存服务 器进行媒体数据的推送； 然后，通过控制用户终端重新向緩存服务器发起携带 特定会话信息的媒体数据请求，由緩存服务器根据该请求向用户终端推送媒体 数据， 从而， OTT服务器可以监测到用户终端的每次媒体数据请求， 从而实 现针对用户终端的每次媒体数据请求进行控制， 提高对媒体数据传输的可控 性。
在实际应用场景中， ΟΤΤ服务器可以通过单播的方式， 将相关媒体数据 推送至某一緩存服务器。 当与 ΟΤΤ服务器连接的緩存服务器有多个时， ΟΤΤ 服务器可以通过组播的方式， 将相关媒体数据推送至每一个緩存服务器。
此外， ΟΤΤ服务器接收到用户终端发起的媒体数据请求之后， 需要对该 用户终端进行鉴权认证，以确定该用户终端发起的媒体数据请求是否可以被接 纳。
而在緩存服务器一侧， 当緩存服务器接收到 ΟΤΤ服务器发送的携带会话 信息的通知消息之后，对此会话信息进行存储， 当接收到用户终端发起的携带 相应会话信息的媒体数据请求之后，仍需要对该用户终端进行认证。将接收到 的该用户终端发起的媒体数据请求中携带的会话信息与自身接收到的通知消 息中携带的会话消息进行比较，如果二者内容匹配， 即用户是在许可的访问时 间内对许可的内容源的许可连接数目范围内的访问请求，则可以确定该用户终 端为合法用户， 且被许可向其提供媒体数据服务， 则根据该用户终端的请求， 向其发送相应的媒体数据。
最后，为了进一步加强 ΟΤΤ服务器对媒体数据请求及内容传输的可控性， 可在用户终端停止获取相应媒体数据之后， 由所述緩存服务器向所述 ΟΤΤ服 务器上报当前媒体数据传输的相关统计信息。 相应地， 本发明实施例还提供了一种 ΟΤΤ服务器， 如图 6所示， 该服务 器具体可以包括：
第一端口 601 , 用于接收用户终端的媒体数据请求；
确定单元 602,用于根据所述至少一个緩存服务器的位置和 /或能力从所述 至少一个緩存服务器中确定一个緩存服务器；
第二端口 603, 用于向所述确定的緩存服务器以及所述用户终端发送携带 会话信息的通知消息。
如图 7所示， 本实施例提供的 ΟΤΤ服务器还可以包括计费单元 604, 第 一端口 601还用于接收来自緩存服务器的统计信息，计费单元 604用于根据该 统计信息对用户终端进行计费。 相应上述 OTT服务器， 本发明实施例还提供了一种緩存服务器， 所述緩 存服务器和 OTT服务器相连， 如图 8所示， 所述緩存服务器包括：
网络侧接口单元 801 , 用于接收来自所述 OTT服务器的携带有会话信息 的通知消息；
第一用户侧接口单元 802, 用于接收来自用户终端的携带有会话信息的媒 体数据请求；
控制单元 803 , 用于将来自所述 OTT的会话信息与来自所述用户终端的 会话信息进行比较；
第二用户侧接口单元 804, 用于在来自所述 OTT的会话信息与来自所述 用户终端的会话信息匹配时， 向所述用户终端发送相应的媒体数据。 对于系统和装置实施例而言， 由于其基本相应于方法实施例， 所以描述得 比较筒单，相关之处参见方法实施例的部分说明即可。 以上所描述的系统实施 例仅仅是示意性的，其中所述作为分离部件说明的模块可以是或者也可以不是 物理上分开的，作为模块显示的部件可以是或者也可以不是物理模块， 即可以 位于一个地方， 或者也可以分布到多个网络模块上。可以根据实际的需要选择 其中的部分或者全部模块来实现本实施例方案的目的。本领域普通技术人员在 不付出创造性劳动的情况下， 即可以理解并实施。
对所公开的实施例的上述说明，使本领域专业技术人员能够实现或使用本 发明。 对这些实施例的多种修改对本领域的专业技术人员来说将是显而易见 的，本文中所定义的一般原理可以在不脱离本发明实施例的精神或范围的情况 下， 在其它实施例中实现。 因此， 本发明实施例将不会被限制于本文所示的这 些实施例， 而是要符合与本文所公开的原理和新颖特点相一致的最宽的范围。

Claims

权 利 要 求
1、 一种基于在 Internet上层 OTT的媒体数据传输方法， 其特征在于， 所 述方法包括：
OTT服务器接收用户终端发起的媒体数据请求， 所述 OTT服务器连接有 至少一个緩存服务器；
所述 OTT服务器根据所述至少一个緩存服务器的位置和 /或能力从所述至 少一个緩存服务器中确定一个緩存服务器；
所述 OTT服务器发送携带有会话信息的通知消息至所述用户终端及所确 定的緩存服务器；以便于所述确定的緩存服务器接收来自所述用户终端的携带 所述会话信息的媒体数据请求， 并向所述用户终端发送相应媒体数据。
2、 根据权利要求 1所述的基于 OTT的媒体数据传输方法， 其特征在于， 所述 OTT服务器通过组播或单播的方式， 将相关媒体数据推送至所述确定的 緩存服务器。
3、 根据权利要求 1所述的基于 OTT的媒体数据传输方法， 其特征在于， 所述 OTT服务器接收用户终端发起的媒体数据请求之后， 还包括：
所述 OTT服务器对所述用户终端进行鉴权认证。
4、 根据权利要求 1-3任意一项所述的方法， 其特征在于， 所述会话信息 包括： 描述用户有效性的用户标识、描述计费有效性的会话标识、 描述版权许 可有效性的内容标识、描述版权控制方式的版权信息、描述计费模式的计费信 息、描述媒体数据服务结束后的反馈信息需求、描述用户请求被许可访问的状 态持续时间和并发连接数目等信息中的一个或多个的组合。
5、 根据权利要求 4所述的方法， 其特征在于， 所述会话信息携带有所述 确定的緩存服务器的 IP地址和 /或通用资源标识符 URI。
6、 一种 OTT服务器， 其特征在于， 所述 OTT服务器与至少一个緩存服 务器相连， 所述 OTT服务器包括：
第一端口， 用于接收用户终端的媒体数据请求；
确定单元， 用于根据所述至少一个緩存服务器的位置和 /或能力从所述至 少一个緩存服务器中确定一个緩存服务器；
第二端口，用于向所述确定的緩存服务器以及所述用户终端发送携带会话 信息的通知消息。
7、 根据权利要求 6所述的 OTT服务器， 其特征在于， 所述 OTT服务器 还包括计费单元，
所述第一端口还用于接收来自所述确定的緩存服务器的统计信息； 所述计费单元用于根据所述统计信息对所述用户终端进行计费。
8、一种緩存服务器，所述緩存服务器和在 Internet上层 OTT服务器相连， 其特征在于， 所述緩存服务器包括：
网络侧接口单元， 用于接收来自所述 OTT服务器的携带有会话信息的通 知消息；
第一用户侧接口单元，用于接收来自用户终端的携带有会话信息的媒体数 据请求；
控制单元， 用于将来自所述 OTT的会话信息与来自所述用户终端的会话 信息进行比较；
第二用户侧接口单元， 用于在来自所述 OTT的会话信息与来自所述用户 终端的会话信息匹配时， 向所述用户终端发送相应的媒体数据。
9、 一种基于 OTT的媒体数据传输系统， 其特征在于， 包括： 用户终端、 OTT服务器以及至少一个緩存服务器； 其中，
所述 OTT服务器， 用于接收所述用户终端发起的媒体数据请求， 根据所 述至少一个緩存服务器的位置和 /或能力从所述至少一个緩存服务器中确定一 个緩存服务器，发送携带有会话信息的通知消息至所述用户终端及所述确定的 緩存服务器；
所述緩存服务器，用于接收来自所述用户终端的携带所述会话信息的媒体 数据请求， 并向所述用户终端发送相应媒体数据。
10、根据权利要求 9所述的基于 OTT的媒体数据传输系统， 其特征在于， 所述 OTT服务器还用于， 在接收用户终端发起的媒体数据请求之后， 对所述 用户终端进行鉴权认证。
11、根据权利要求 9所述的基于 OTT的媒体数据传输系统， 其特征在于， 所述相应緩存服务器还用于，将接收到的媒体数据请求中携带的会话信息与所 述通知消息中携带的会话消息进行比较， 对所述用户终端进行认证。
12、根据权利要求 9所述的基于 OTT的媒体数据传输系统， 其特征在于， 所述相应緩存服务器还用于， 当所述用户终端终止获取媒体数据时， 向所述 OTT服务器上报当前媒体数据传输的相关统计信息。
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