WO2018133306A1 - 内容分发网络中的调度方法和设备 - Google Patents

内容分发网络中的调度方法和设备 Download PDF

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Publication number
WO2018133306A1
WO2018133306A1 PCT/CN2017/088148 CN2017088148W WO2018133306A1 WO 2018133306 A1 WO2018133306 A1 WO 2018133306A1 CN 2017088148 W CN2017088148 W CN 2017088148W WO 2018133306 A1 WO2018133306 A1 WO 2018133306A1
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cdn
cdn service
scheduling
service provider
sla
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PCT/CN2017/088148
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English (en)
French (fr)
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闫伟
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华为技术有限公司
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Priority to CN201780003331.2A priority Critical patent/CN108521856A/zh
Priority to US16/098,749 priority patent/US10897406B2/en
Priority to EP17892316.5A priority patent/EP3451614B1/en
Publication of WO2018133306A1 publication Critical patent/WO2018133306A1/zh

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    • 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
    • H04L65/80Responding to QoS
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L67/00Network arrangements or protocols for supporting network services or applications
    • H04L67/01Protocols
    • H04L67/10Protocols in which an application is distributed across nodes in the network
    • H04L67/1001Protocols in which an application is distributed across nodes in the network for accessing one among a plurality of replicated servers
    • H04L67/1004Server selection for load balancing
    • H04L67/1008Server selection for load balancing based on parameters of servers, e.g. available memory or workload
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L41/00Arrangements for maintenance, administration or management of data switching networks, e.g. of packet switching networks
    • H04L41/50Network service management, e.g. ensuring proper service fulfilment according to agreements
    • H04L41/5003Managing SLA; Interaction between SLA and QoS
    • H04L41/5019Ensuring fulfilment of SLA
    • 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
    • H04L65/40Support for services or applications
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L67/00Network arrangements or protocols for supporting network services or applications
    • H04L67/01Protocols
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L67/00Network arrangements or protocols for supporting network services or applications
    • H04L67/01Protocols
    • H04L67/10Protocols in which an application is distributed across nodes in the network
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L67/00Network arrangements or protocols for supporting network services or applications
    • H04L67/01Protocols
    • H04L67/10Protocols in which an application is distributed across nodes in the network
    • H04L67/1001Protocols in which an application is distributed across nodes in the network for accessing one among a plurality of replicated servers
    • H04L67/1004Server selection for load balancing
    • H04L67/101Server selection for load balancing based on network conditions
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L67/00Network arrangements or protocols for supporting network services or applications
    • H04L67/50Network services
    • H04L67/60Scheduling or organising the servicing of application requests, e.g. requests for application data transmissions using the analysis and optimisation of the required network resources
    • H04L67/63Routing a service request depending on the request content or context
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L9/00Cryptographic mechanisms or cryptographic arrangements for secret or secure communications; Network security protocols
    • H04L9/40Network security protocols

Definitions

  • the present invention relates to the field of communications technologies, and more particularly to a scheduling method and device in a content distribution network.
  • a video service operator often uses multiple CDN (Content Delivery Network) service provider CDN nodes to provide users with video on demand or live broadcast services.
  • CDN scheduling system dispatches the play request to the CDN network of the video service operator's own CDN or a CDN service provider.
  • the existing CDN scheduling system usually schedules the most appropriate edge CDN nodes according to the user's local area during scheduling, or schedules user requests to CDN nodes of different CDN service providers in proportion according to pre-configured business rules.
  • the above scheduling method is relatively simple, and the quality of service of the selected CDN node is not guaranteed, which affects the user experience.
  • the service SLA information determines a target CDN service provider that satisfies the quality requirement; returns information of the CDN node of the target CDN service provider to the video client for the video client to the target CDN service provider
  • the CDN node sends a play request, where the CDN service SLA information includes at least one of the following: a total number of service users, a play success rate, a play failure rate, a total number of user service cards, a user service card ratio, a return rate,
  • the user downloads the compliance rate, the service reliability parameter, the broadcast delay rate, and the download rate.
  • the scheme Since the scheme considers the CDN service SLA information and selects the target CDN service provider that meets the quality requirements, the quality of the service provided by the target CDN service provider's CDN node for the video client can be improved, thereby improving the Flexibility, reliability, and user satisfaction in scheduling in CDN networks.
  • the scheduling system stores a scheduling rule, where the scheduling rule is configured by an administrator; the scheduling rule includes: adjusting, according to a CDN service SLA quality parameter reported by multiple video clients, The scheduling ratio of the plurality of CDN service providers, the CDN service SLA quality parameters reported by the plurality of video clients include at least one of the following: a success rate of the broadcast period, a user service card ratio, and a broadcast delay rate; or Adjusting a scheduling ratio of the plurality of CDN service providers according to an access SLA indicator of a CDN node of the plurality of CDN service providers to a scheduling system; and accessing the SLA indicator of the CDN node of the CDN service provider to the scheduling system includes The rate ratio of the plurality of CDN service providers is adjusted according to the SLA service log information of the plurality of CDN service providers, and the SLA service log information includes at least one of the following: the user downloads the compliance rate, and the service is reliable. Sexual parameters.
  • the CDN service provider whose value of the CDN service SLA information in the current statistical period or the most recent complete statistical period is within a preset range is determined as the target CDN service provider. Or determining, by the CDN service provider in the current statistical period or the latest one of the complete statistical periods, that the scheduling ratio is within the preset range as the target CDN service provider; or according to the play request in the current statistical period or the number of times the scheduling request is played, And determining the target CDN service provider proportionally according to a scheduling ratio of the plurality of CDN service providers.
  • the second aspect of the embodiments of the present invention further provides a scheduling system, configured to perform the method according to the first aspect, the system includes: a scheduling execution center, configured to receive a play scheduling request sent by a video client; and CDN quality of service monitoring a subsystem for acquiring CDN service SLA information of a plurality of CDN service providers; a scheduling execution center, configured to determine a target CDN service provider that satisfies quality requirements based on at least CDN service SLA information of a plurality of CDN service providers; Returning the video client to the information of the CDN node of the target CDN service provider for the video client to serve the target CDN The CDN node of the service provider sends a play request.
  • the system can include one or more servers, each server including a respective memory and processor.
  • the scheduling system further includes: a CDN scheduling rule management subsystem, configured to receive an administrator's configuration operation on the scheduling rule, and a scheduling rule base, configured to store the scheduling rule in the foregoing method example.
  • a CDN scheduling rule management subsystem configured to receive an administrator's configuration operation on the scheduling rule
  • a scheduling rule base configured to store the scheduling rule in the foregoing method example.
  • the scheduling system further includes: a CDN content media server, configured to receive a return source request sent by the CDN node of the multiple CDN service providers, and return the media content corresponding to the return source request.
  • a CDN content media server configured to receive a return source request sent by the CDN node of the multiple CDN service providers, and return the media content corresponding to the return source request.
  • a third aspect of the embodiments of the present invention further provides a method for acquiring media content, which is performed by a video client, including receiving a play request input by a user, and generating a play scheduling request in response to the play request of the user, to the Dispatching the system to send the play scheduling request; receiving information of a CDN node of the target CDN service provider returned by the scheduling system according to the play request; sending the play request to a CDN node of the target CDN service provider; receiving The video returned by the target CDN service provider.
  • a fourth aspect of the embodiments of the present invention further provides a video client, including a memory, a processor, and a computer program stored on the memory and executable on the processor, wherein the processor executes the computer The program instructs the video client to implement a method of obtaining media content.
  • a fifth aspect of the embodiments of the present invention further provides a scheduling system including a memory, a processor, and a computer program stored on the memory and operable on the processor, wherein the processor executes the computer
  • the program implements the method as described in the first aspect by the scheduling system
  • FIG. 2 is a schematic diagram of interaction of a scheduling method in a content distribution network according to an embodiment of the present invention
  • FIG. 4 is a schematic diagram of interaction of CDN service quality monitoring according to an embodiment of the present invention.
  • first, second, third, etc. may be used to describe various messages, requests, and terminals in the embodiments of the present invention, these messages, requests, and terminals should not be limited to these terms. These terms are only used to distinguish messages, requests, and terminals from one another.
  • a first terminal may also be referred to as a second terminal without departing from the scope of the embodiments of the present invention.
  • the second terminal may also be referred to as a first terminal.
  • the words “if” or “if” as used herein may be interpreted as “when” or “when” or “in response to determining” or “in response to detecting.”
  • the phrase “if determined” or “if detected (conditions or events stated)” may be interpreted as “when determined” or “in response to determination” or “when detected (stated condition or event) “Time” or “in response to a test (condition or event stated)”.
  • the preset time period, the statistical period, the preset level, the preset range, the preset level, and the like in the embodiment of the present invention may be selected according to actual conditions.
  • the CDN service SLA information includes a user service card ratio, a return rate, and a playback success rate.
  • the CDN service SLA information includes a user service card ratio, a return rate, and a playback success rate, and includes a total number of service users of the statistical time period, a user download compliance rate, and a reliable service. At least one of the total number of sexual and user service Kartons, wherein the user service card ratio, the return rate, and the playback success rate are higher than other information.
  • the CDN service provider can be divided into several levels, for example, the first-level corresponding scheduling ratio is 50%-80%, and the second-level corresponding scheduling ratio is 30%-50%, three-level.
  • the corresponding scheduling ratio is 10%-30%.
  • the initial level and initial scheduling ratio may be set according to the CDN service SLA information of the CDN service provider within a certain period, for example, the quality of the CDN service provider is higher than that of the CDN service provider with lower quality. It should be noted that for different levels of CDN service providers, different service prices can be set to encourage the CDN service provider to guarantee the quality of service of the node.
  • the scheduling ratio of the CDN service provider may be dynamically adjusted according to the parameters determined by the scheduling rule.
  • the CDN service SLA information determined according to the scheduling rule is a card rate, and may be 0 cards for 5 consecutive days.
  • the service provider's scheduling ratio of CDNs with a rate of less than 95% is reduced by 10%.
  • the parameters determined according to the scheduling rule are a cardon rate and a return rate, and may be less than 95% or a return rate of >15% for one statistical period or multiple consecutive statistical periods.
  • the scheduling ratio of CDN's service providers is reduced by 10%.
  • the CDN service SLA information determined according to the scheduling rule is a card rate, a return rate, and a success rate, and may be less than 95% of the zero card rate in one statistical period or multiple consecutive statistical periods.
  • the service provider's scheduling ratio of CDNs with a playback success rate of ⁇ 98% or a return rate of >15% is reduced by 10%. It can be understood that other implementation manners can be obtained by those skilled in the art according to the above examples.
  • the scheduling system summarized in the embodiment of the present invention selects a target CDN service provider that meets the CDN service quality requirement from among a plurality of CDN service providers that provide services for the video service operator, so as to be selected by the selected CDN service provider.
  • the node provides services to the user.
  • the scheduling system may select, according to the value of the CDN service SLA information of the plurality of CDN service providers, the CDN service providing the value in the first preset range (the setting of the first preset range embodies the CDN service quality requirement)
  • the scheduling system can obtain the scheduling ratio of each CDN service provider according to the CDN service SLA information and scheduling rules of multiple CDN service providers, and then allocate according to the scheduling ratio for a period of time.
  • the scheduling system can obtain the scheduling ratio of each CDN service provider according to the CDN service SLA information and scheduling rules of multiple CDN service providers, and then Selecting a CDN service provider whose scheduling ratio is in a second preset range as a target CDN service provider; optionally, the scheduling system can obtain each CDN according to CDN service SLA information and scheduling rules of multiple CDN service providers. The service provider's scheduling ratio is further graded, and the CDN service provider of the preset level is selected as the target CDN service provider. It can be seen that the above scheduling system directly or indirectly selects the CDN service SLA information of a plurality of CDN service providers that can evaluate the service quality of each CDN service provider in selecting the target CDN service provider.
  • FIG. 1 is a schematic structural diagram of a part of a content distribution network according to an embodiment of the present invention.
  • Figure 1 shows the scheduling system responsible for scheduling, the nodes of the CDN service provider, and the user-operable video clients.
  • FIG. 2 is a schematic diagram of interaction of a scheduling method in a content distribution network according to an embodiment of the present invention.
  • the CDN content media server saves media content such as video.
  • the node of the CDN service provider does not cache the video to be played by the user, it needs to send a source request to the CDN content media server to obtain the video.
  • the video client can provide a video service device for the user, for example, a mobile phone, a tablet, a palmtop computer, or the like.
  • the user inputs a play request through the input interface of the video client, and the play module processes the play request, for example, sends a play scheduling request to the dispatch system.
  • the scheduling system includes the scheduling execution center receiving the playback scheduling request, and according to the CDN service SLA information of each CDN service provider provided by each CDN quality of service monitoring subsystem, and the scheduling rules set by the administrator, the scheduling ratio is obtained, and the playback request of the client is scheduled.
  • the CDN node corresponding to the target CDN service provider returns the information of the CDN service provider that satisfies the condition to the video client.
  • the node of each CDN service provider sends a return source request to the CDN content media server, where the video that is not cached on the node and that the user wants to play is obtained.
  • the CDN content media server collects information such as the number of times of returning the source request or the return source rate of the CDN service provider node, and reports the information to the CDN service SLA information processing module.
  • the scheduling execution subsystem reports the number of times of scheduling to the CDN service provider in a preset time period, and the like to the CDN service SLA information processing module.
  • the preset time period can be set according to the time situation.
  • the node of each CDN service provider reports the service log information (including information such as the user download rate and the code rate of the video playback) to the CDN service SLA information processing module in a preset time period.
  • the preset time period may be the same as or different from the preset time period in 303.
  • the scheduling execution center acquires a scheduling rule set by an administrator from the scheduling rule base.
  • the scheduling execution center obtains the CDN service SLA information of each CDN service provider provided by the CDN service quality monitoring subsystem, adjusts the scheduling ratio of each CDN service provider according to the CDN service SLA information and scheduling rules of each CDN service provider, and then according to the scheduling.
  • the ratio determines the target CDN service provider. For example, the CDN service provider whose scheduling ratio is greater than a certain threshold (which can be selected according to the actual situation) in the current statistical period or the most recent complete statistical period is determined as the target CDN service provider, or the current statistical period or the most recent complete statistical period.
  • the CDN service provider within the scheduling ratio that is less than a certain threshold (which may be selected according to the actual situation) is determined as the target CDN service provider; or
  • the pro-distribution is performed according to the number of play requests or play scheduling requests and/or scheduled play requests within a preset time period, and the scheduling ratio is added to determine the target CDN service provider.
  • the level of each CDN service provider is set after the scheduling ratio is determined, and the CDN service provider of the preset level is determined as the target CDN service provider.
  • step 307 only the CDN service SLA information of each CDN service provider can be selected to select the target CDN service provider, for example, the specific value of the CDN service SLA information in the current statistical period or the most recent complete statistical period is A certain range of CDN service providers are identified as target CDN service providers (eg, 0 times the card rate is higher than 95%, or the playback success rate is >98% or the return rate is ⁇ 15%, etc.).
  • the scheduling execution center returns a message to the video client, where the message carries the information of the target CDN service provider, for example, the address of the CDN node of the target CDN service provider, or other information that can be found by the video client for the node. information.
  • the video client initiates a play request to the CDN node of the target CDN service provider according to the message returned by the scheduling execution center.
  • the CDN node provides a corresponding video service according to the play request, and the implementation process may refer to related content in the prior art.
  • the scheduling execution center sends the information scheduled to the corresponding CDN service provider to the CDN scheduling and charging subsystem, and the CDN scheduling and charging system performs charging and settlement according to the result information of the real-time scheduling.
  • FIG. 5 is a schematic structural diagram of a video client or a server according to an embodiment of the present invention.
  • the video client includes a memory, a processor, and a computer program stored on the processor and executable on the processor, the processor executing the computer program to instruct the video client to perform the method implementation described above The steps performed by the video client in the example.
  • the above scheduling system may include one or more servers, each server including a memory, a processor, and a computer program stored on the processor and operable on the processor, the processor executing the computer program with instructions
  • the server completes the corresponding steps.
  • one or more of the scheduling execution center, the CDN quality of service monitoring subsystem, the CDN content media server, the CDN scheduling rule management subsystem, and the scheduling and charging subsystem in the scheduling system may be implemented on one server, then The processor of the server executes the computer program to instruct the server to perform the steps performed by the subsystem and/or the center.
  • the units described as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, that is, may be located in one place, or may be distributed to multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of the embodiment.
  • each functional unit in each embodiment of the present invention may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit.
  • the form of a software product is stored in a storage medium, including instructions for causing a computer device (which may be a personal computer, a central server, or a network device, etc.) or a processor to execute the program. All or part of the steps of the method described in the various embodiments are invented.
  • the foregoing storage medium includes: a U disk, a mobile hard disk, a read-only memory (ROM), a random access memory (RAM), a magnetic disk, or an optical disk, and the like. .

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  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Multimedia (AREA)
  • Computer Hardware Design (AREA)
  • General Engineering & Computer Science (AREA)
  • Computer Security & Cryptography (AREA)
  • Two-Way Televisions, Distribution Of Moving Picture Or The Like (AREA)
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Abstract

本发明实施例提供了内容分发网络中的调度方法和设备,提供了一种基于CDN服务SLA信息来选择满足质量要求的目标CDN服务提供商的方案,提升了内容分发网络中的调度的灵活性,也保证了服务质量。

Description

内容分发网络中的调度方法和设备
本申请要求于2017年1月22日提交中国专利局、申请号为201710053963.1、发明名称为“一种基于多CDN厂商服务SLA的CDN动态调度方法和设备”的中国专利申请的优先权,其全部内容通过引用结合在本申请中。
技术领域
本发明涉及通信技术领域,尤指一种内容分发网络中的调度方法和设备。
背景技术
一个视频业务运营商常采用多家CDN(Content Delivery Network,内容分发网络)服务提供商的CDN节点为用户提供视频点播或直播等服务。对用户的播放请求,CDN调度系统把该播放请求调度到视频业务运营商自己的CDN网络或某CDN服务提供商的CDN节点上。现有的CDN调度系统在调度时通常根据用户所在地域调度到最合适的边缘CDN节点,或依据事先配置的商业规则将按比例将用户请求调度到不同的CDN服务厂商的CDN节点等。但上述调度方式比较单一,选择出的CDN节点的服务质量没有保证,影响用户的体验。
发明内容
本发明实施例第一方面提供了一种内容分发网络中的调度方法,包括:调度系统接收视频客户端发送的播放调度请求;响应于该播放调度请求,至少根据多家CDN服务提供商的CDN服务SLA信息确定满足质量要求的目标CDN服务提供商;向所述视频客户端返回所述目标CDN服务提供商的CDN节点的信息,以供所述视频客户端向所述目标CDN服务提供商的CDN节点发送播放请求;其中,所述CDN服务SLA信息包括以下至少一个:服务用户的总次数,播放成功率、播放失败率、用户服务卡顿总次数、用户服务卡顿比率、回源率、用户下载达标率、服务可靠性参数、起播时延达标率、下载速率。由于本方案考虑了CDN服务SLA信息,并据此选择了满足质量要求的目标CDN服务提供商,该目标CDN服务提供商的CDN节点为视频客户端提供的服务的质量能够得到保障,从而提高了CDN网络中调度的灵活性、可靠性,和用户满意度。
可选的,所述调度系统存储调度规则,所述调度规则由管理员配置;所述调度规则包括:根据多个视频客户端上报的CDN服务SLA质量参数调整所述 多家CDN服务提供商的调度比例,所述多个视频客户端上报的CDN服务SLA质量参数包括以下至少一个:统计周期内播放成功率、用户服务卡顿比、起播时延达标率;或根据所述多家CDN服务提供商的CDN节点到调度系统的访问SLA指标调整所述多家CDN服务提供商的调度比例;所述CDN服务提供商的CDN节点到调度系统的访问SLA指标包括回源率;或根据依据所述多家CDN服务提供商的SLA服务日志信息调整所述多家CDN服务提供商的调度比例,所述SLA服务日志信息包括以下至少一个:用户下载达标率、服务可靠性参数。
可选的,对预设时间段内的0次卡顿率低于95%的CDN的服务提供商的调度比例下调10%,或对预设时间段内播放成功率<98%的CDN的服务提供商的调度比例下调10%,或对一个统计周期或多个连续统计周期内的回源率>15%的CDN的服务提供商的调度比例下调10%。根据上述的多家CDN服务提供商的CDN服务SLA信息,可以动态调整多家CDN服务提供商的调度比例,以便后续依据该调度比例确定目标CDN服务提供商的结果更具有实时性和准确性。
可选的,将当前统计周期或最近一个完整统计周期内CDN服务SLA信息的数值在预设范围内的CDN服务提供商确定为目标CDN服务提供商。或者,将当前统计周期或最近一个完整统计周期内的调度比例在预设范围内的CDN服务提供商确定为目标CDN服务提供商;或按照当前统计周期内的播放请求或播放调度请求的次数,以及根据所述多家CDN服务提供商的调度比例,按比例确定所述目标CDN服务提供商。又或者,按照所述多家CDN服务提供商的调度比例,将所述多家CDN服务提供商划分为至少两个等级,将预设等级的CDN服务提供商确定为目标CDN服务提供商。上述的目标CDN服务提供商直接依据CDN服务SLA信息的数值来确定,或者依据CDN服务SLA信息而确定的调度比例或等级来确定,这些确定方式均基于了CDN服务提供商的服务质量,并且确定的方式多样而灵活。
本发明实施例第二方面还提供了一种调度系统,用于执行第一方面所述的方法,该系统包括,调度执行中心,用于接收视频客户端发送的播放调度请求;CDN服务质量监测子系统,用于获取多家CDN服务提供商的CDN服务SLA信息;调度执行中心,用于至少根据多家CDN服务提供商的CDN服务SLA信息确定满足质量要求的目标CDN服务提供商;向所述视频客户端返回所述目标CDN服务提供商的CDN节点的信息,以供所述视频客户端向所述目标CDN服 务提供商的CDN节点发送播放请求。该系统可以包括一个或多个服务器,每个服务器包括相应的存储器和处理器。
可选的,所述调度系统还包括:CDN调度规则管理子系统,用于接收管理员对调度规则的配置操作;调度规则库,用于存储前述方法例中所述的调度规则。
可选的,所述调度系统还包括:CDN内容媒体服务器,用于接收所述多家CDN服务提供商的CDN节点发送的回源请求,并返回所述回源请求对应的媒体内容。
本发明实施例第三方面,还提供一种获取媒体内容的方法,由视频客户端执行,包括接收用户的输入的播放请求;响应于所述用户的播放请求,生成播放调度请求,向所述调度系统发送所述播放调度请求;接收所述调度系统根据所述播放请求返回的目标CDN服务提供商的CDN节点的信息;向所述目标CDN服务提供商的CDN节点发送所述播放请求;接收所述目标CDN服务提供商返回的视频。可选的,所述视频客户端向调度系统上报CDN服务SLA质量参数,所述CDN服务SLA质量参数包括:以下至少一个:统计周期内播放成功率、用户服务卡顿比、起播时延达标率。
本发明实施例第四方面还提供一种视频客户端,包括存储器、处理器以及存储在该存储器上并可在该处理器上运行的计算机程序,其特征在于,所述处理器执行所述计算机程序时以指令所述视频客户端实现获取媒体内容的方法。
本发明实施例第五方面还提供了一种调度系统,包括存储器、处理器以及存储在该存储器上并可在该处理器上运行的计算机程序,其特征在于,所述处理器执行所述计算机程序时以指令所述调度系统实现如第一方面所述的方法、
本发明实施例提供的内容分发网络中的调度方法和设备,提供了一种由调度系统基于CDN服务SLA信息来选择满足质量要求的目标CDN服务提供商的方案,而CDN服务SLA信息可以有多种情况,从而提升了内容分发网络中的调度的灵活性,也保证了服务质量。
附图说明
图1为本发明实施例一种内容分发网络的部分结构示意图;
图2为本发明实施例一种内容分发网络中的调度方法的交互示意图;
图3为本发明实施例一种根据内容分发网络中的调度方法的流程图;
图4为本发明实施例一种CDN服务质量监测的交互示意图;
图5为本发明实施例一种视频客户端或服务器的结构示意图。
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。
在本发明实施例中使用的术语是仅仅出于描述特定实施例的目的,而非旨在限制本发明。在本发明实施例和所附权利要求书中所使用的单数形式的“一种”、“所述”和“该”也旨在包括多数形式,除非上下文清楚地表示其他含义。还应当理解,本文中使用的术语“和/或”是指并包含一个或多个相关联的列出项目的任何或所有可能组合。本文中字符“/”,一般表示前后关联对象是一种“或”的关系。
应当理解,尽管在本发明实施例中可能采用术语第一、第二、第三等来描述各种消息、请求和终端,但这些消息、请求和终端不应限于这些术语。这些术语仅用来将消息、请求和终端彼此区分开。例如,在不脱离本发明实施例范围的情况下,第一终端也可以被称为第二终端,类似地,第二终端也可以被称为第一终端。
取决于语境,如在此所使用的词语“如果”或“若”可以被解释成为“在……时”或“当……时”或“响应于确定”或“响应于检测”。类似地,取决于语境,短语“如果确定”或“如果检测(陈述的条件或事件)”可以被解释成为“当确定时”或“响应于确定”或“当检测(陈述的条件或事件)时”或“响应于检测(陈述的条件或事件)”。
本发明实施例中的预设时间段、统计周期、预设等级、预设范围、预设等级等可以根据实际情况需要进行选择。
本发明实施例中,CDN服务提供商是一些提供CDN节点的服务提供商,例如,腾讯等。CDN服务提供商的多个节点可以分别为一个或多个视频业务运营商提供服务。
本发明实施例中,CDN服务SLA(Service-Level Agreement,服务等级协议) 信息包括以下至少一个:服务用户的总次数,播放成功率、播放失败率、用户服务卡顿总次数、用户服务卡顿比率(以下简称卡顿率)、用户下载达标率、回源率、服务可靠性参数、起播时延达标率(即起播时延满足要求时间比率)、下载速率等其他可以用于评估服务质量的信息,上述信息中的次数可以为统计周期(可以根据情况配置,例如是一天等)内总数或平均值等,本发明实施例对此不做限定。可选的,CDN服务SLA信息包括用户服务卡顿比率,回源率和播放成功率。在另一种可选的实施方式中,CDN服务SLA信息除了包括用户服务卡顿比率,回源率和播放成功率,还包括统计时间周期的服务用户的总次数、用户下载达标率、服务可靠性和用户服务卡顿总次数中的至少一个,其中,用户服务卡顿比率,回源率和播放成功率所占的权重高于其他信息。可选的,视频客户端上报的信息包括下载速率、当前网速、视频码率、播放失败信息、卡顿信息、起播时延等;CDN内容媒体服务器及调度执行子系统上报的CDN服务提供商的CDN节点到系统的访问SLA信息,包括如回源率等;CDN服务提供商可提供SLA服务日志信息,如用户下载达标率、服务可靠性参数等。通过对在一个统计周期内(可根据实际情况配置)的各CDN服务提供商的CDN服务SLA信息的统计,可以评估各CDN服务提供商的服务质量。调度系统直接或者间接的依据该CDN服务SLA信息,可以选择出服务质量有保证的CDN服务提供商。
本发明实施例中的调度规则可以定义调度所依据的CDN服务SLA信息或者调整调度比例所依据的CDN服务SLA信息。该调度规则有多种实现方式,例如,可以是(1)依据各视频客户端上报的CDN服务SLA质量参数:如设置在统计周期内播放成功率、用户服务卡顿比、起播时延达标率等参数;或者(2)依据CDN服务提供商的CDN节点到调度系统的访问SLA指标,如回源率等;或者(3)依据CDN服务提供商的SLA服务日志信息,如用户下载达标率、服务可靠性参数等。
本发明实施例中,调度比例为各CDN服务提供商的被调度的比例,为同一个视频业务运营商提供服务的CDN服务提供商的调度比例相加为100%,例如,为视频业务运营商提供服务的一共有三个CDN服务提供商A,B和C,这三个CDN服务提供商的调度比例分别为30%,40%和30%,则对于总共N个播放请求,调度系统将N*30%个播放请求分配被CDN服务提供商A来提供服务,将 N*40%个播放请求分配被CDN服务提供商B来提供服务,将N*30%个播放请求分配被CDN服务提供商C来提供服务。进一步的,按照上述调度比例,可以将CDN服务提供商分为几个等级,例如,一级对应的调度比例为50%-80%,二级对应的调度比例为30%-50%,三级对应的调度比例为10%-30%。初始的等级和初始的调度比例可以根据一定周期内的CDN服务提供商的CDN服务SLA信息来设置,例如,质量好的CDN服务提供商的等级高于质量稍差的CDN服务提供商的等级。需要说明的是,对于不同等级的CDN服务提供商,可以定成不同的服务价格,以激励CDN服务提供商保证节点的服务质量。
在本发明实施例中,可以依据调度规则确定的参数来动态调整CDN服务提供商的调度比例,例如,根据调度规则确定的CDN服务SLA信息是卡顿率,可以对连续5天的0次卡顿率低于95%的CDN的服务提供商的调度比例下调10%。在一个实施方式中,根据调度规则确定的参数是卡顿率和回源率,可以对一个统计周期或多个连续统计周期内0次卡顿率低于95%或回源率>15%的CDN的服务提供商的调度比例下调10%。在另一个实施方式中,根据调度规则确定的CDN服务SLA信息是卡顿率、回源率和成功率,可以对一个统计周期或多个连续统计周期内0次卡顿率低于95%或播放成功率<98%或回源率>15%的CDN的服务提供商的调度比例下调10%。可以理解,本领域技术人员还可以依据上述举例得到其他实现方式。
本发明实施例汇总的调度系统,从为视频业务运营商提供服务的多个CDN服务提供商中,选择满足CDN服务质量要求的目标CDN服务提供商,以便由该选出的CDN服务提供商的节点为用户提供服务。可选的,调度系统可以依据多家CDN服务提供商的CDN服务SLA信息的数值,选择数值在第一预设范围(该第一预设范围的设置体现了CDN服务质量要求)的CDN服务提供商作为目标CDN服务提供商;可选的,调度系统可以依据多家CDN服务提供商的CDN服务SLA信息和调度规则,得到各家CDN服务提供商的调度比例,然后按照调度比例分配一段时间内的播放请求/播放调度请求由哪个CDN服务提供商支持;可选的,调度系统可以依据多家CDN服务提供商的CDN服务SLA信息和调度规则,得到各家CDN服务提供商的调度比例,然后选择调度比例在第二预设范围的CDN服务提供商作为目标CDN服务提供商;可选的,调度系统可以依据多家CDN服务提供商的CDN服务SLA信息和调度规则,得到各家CDN 服务提供商的调度比例,并进一步得到等级,选择预设等级的CDN服务提供商作为目标CDN服务提供商。可见,上述调度系统在选择目标CDN服务提供商都直接或间接的依据了可以评估各CDN服务提供商的服务质量的多家CDN服务提供商的CDN服务SLA信息。
调度系统可以只负责选出CDN服务提供商,具体的提供服务的CDN节点可以由选出的CDN服务提供商根据自己的策略从为该视频业务运营商提供服务的节点中来选择,本发明实施例对此不做限定。
图1为本发明实施例一种内容分发网络的部分结构示意图。图1给出了负责调度的调度系统,CDN服务厂提供商的各节点和用户可操作的视频客户端。图2为本发明实施例一种内容分发网络中的调度方法的交互示意图。CDN内容媒体服务器保存视频等媒体内容,当CDN服务提供商的节点没有缓存用户要播放的视频时,需要发送回源请求到CDN内容媒体服务器去获取该视频。
其中,视频客户端可以为用户提供视频服务的设备,例如可以是手机、平板,掌上电脑等。用户通过视频客户端的输入接口输入播放请求,播放模块处理该播放请求,例如向调度系统发送播放调度请求。调度系统包括调度执行中心接收该播放调度请求,依据各CDN服务质量监测子系统提供的各CDN服务厂商的CDN服务SLA信息,及管理员设置的调度规则,得到调度比例,将客户端的播放请求调度到目标CDN服务厂商对应的CDN节点,即向视频客户端返回满足条件的CDN服务提供商的信息。调度执行中心还可以将本次调度到对应CDN服务厂商的信息发送到CDN调度计费子系统,CDN调度计费子系统依据调度的结果信息进行计费结算。视频客户端根据调度执行中心返回的信息向对应的CDN服务提供商的节点发送播放请求。
CDN服务质量监测子系统如图4所示,可以包括视频客户端CDN服务质量上报子模块、CDN服务质量监测分析子系统。图1中虚线框仅示出了调度系统中属于CDN服务质量监测子系统的部分。各CDN服务提供商的CDN服务SLA信息可以由视频客户端CDN服务质量上报模块发送、或者可以从CDN内容媒体服务器及调度执行子系统上报的CDN服务提供商的CDN节点到系统的访问SLA信息,和/或CDN服务提供商的SLA服务日志信息获取。可以理解,SLA服务日志信息仅是为该视频业务运营商的调度系统所调度、即为视频业务运营商提供服务的节点的SLA服务日志信息。
图3为本发明实施例一种根据内容分发网络中的调度方法的流程图。以下结合图1和图3进行说明。
301、管理员通过CDN调度规则管理子系统设置调度规则,调度规则存储于调度规则库。该设置可以基于CDN服务SLA的质量灵活设计,如前述举例,此处不再赘述。
302、视频客户端CDN服务质量上报模块上报CDN服务提供商的CDN服务SLA信息到调度系统中的CDN服务SLA信息处理模块。
303a、各CDN服务提供商的节点向CDN内容媒体服务器发送回源请求,用于获取该节点上没有缓存、而用户想要播放的视频。
303b、CDN内容媒体服务器统计各CDN服务提供商节点向其发起的回源请求的次数或者回源率等信息,并向CDN服务SLA信息处理模块上报。
303c、调度执行子系统将预设时间段内到CDN服务提供商的调度次数等,上报到CDN服务SLA信息处理模块。该预设时间段可以根据时间情况设置。
304、各CDN服务提供商的节点将预设时间段内服务日志信息(包括如用户下载速率与其视频播放的码率等信息)上报到CDN服务SLA信息处理模块。该预设时间段可与303中的预设时间段相同或者不同。
305、CDN服务质量分析子系统对CDN服务SLA信息处理模块接收到的SLA信息进行分析处理,得出一定统计周期内各CDN服务厂商的CDN服务SLA信息(此处的CDN服务SLA信息如前述举例,此处不再赘述)。
306、用户向视频客户端输入播放请求,视频客户端中的播放模块发起到调度执行中心的播放调度请求,该播放调度请求用于请求调度执行中心返回目标CDN服务提供商的信息。
307、调度执行中心从调度规则库获取管理员设置的调度规则。
308、调度执行中心获取CDN服务质量监测子系统提供的各CDN服务提供商的CDN服务SLA信息,根据各CDN服务厂商的CDN服务SLA信息和调度规则调整各CDN服务厂商的调度比例,然后根据调度比例确定目标CDN服务提供商。例如,将当前统计周期或最近一个完整统计周期内调度比例大于某个阈值(可根据实际情况选择)的CDN服务提供商确定为目标CDN服务提供商,或者将当前统计周期或最近一个完整统计周期内的调度比例小于某个阈值(可根据实际情况选择)的CDN服务提供商确定为目标CDN服务提供商;或 者按照预设时间段内的播放请求或播放调度请求的次数和/或已调度的播放请求,并且再加上调度比例来按比例分配,以确定目标CDN服务提供商。又或者在确定出调度比例之后设置各CDN服务提供商的等级,将预设等级的CDN服务提供商确定为目标CDN服务提供商。
可以理解,如果省略步骤307,可以只考虑各CDN服务厂商的CDN服务SLA信息来选择目标CDN服务提供商,例如,将当前统计周期或最近一个完整统计周期内满足CDN服务SLA信息的具体数值在某个范围内的CDN服务提供商确定为目标CDN服务提供商(如将0次卡顿率高于95%,或播放成功率>98%或回源率<15%等)。
309、调度执行中心向视频客户端返回消息,该消息中带有目标CDN服务提供商的信息,例如是该目标CDN服务提供商的CDN节点的地址,或其他可以供视频客户端找到该节点的信息。
310、视频客户端依据调度执行中心返回的消息,向目标CDN服务提供商的CDN节点发起播放请求。
CDN节点根据该播放请求,提供对应的视频服务,该实现过程可参考现有技术中的相关内容。
311、调度执行中心将本次调度到对应CDN服务厂商的信息发送到CDN调度计费子系统,CDN调度计费系统依据实时调度的结果信息进行计费结算。
可以理解,上述方法流程图仅是一个实例,其中部分步骤的顺序可以根据需要进行调换。例如,303c、303d和404的上报可以同时,或有先有后,其具体顺序不构成对本发明的限定,
图5为本发明实施例一种视频客户端或服务器的结构示意图。
该视频客户端包括,包括存储器、处理器以及存储在该存储器上并可在该处理器上运行的计算机程序,所述处理器执行所述计算机程序时以指令所述视频客户端完成上述方法实施例中视频客户端执行的步骤。
上述调度系统可以包括一个或多个服务器,每个服务器包括包括存储器、处理器以及存储在该存储器上并可在该处理器上运行的计算机程序,所述处理器执行所述计算机程序时以指令所述服务器完成对应的步骤。
例如,该调度系统的所有系统和中心可以在一个服务器上实现,则该服务器的处理器执行所述计算机程序时以指令所述服务器完成上述调度系统所执行 的步骤。
或者,该调度系统中的调度执行中心、CDN服务质量监测子系统、CDN内容媒体服务器、CDN调度规则管理子系统和调度计费子系统中的一个或多个可以在一个服务器上实现,则该服务器的处理器执行所述计算机程序时以指令所述服务器完成上述子系统和/或中心所执行的步骤。
本领域普通技术人员可以意识到,结合本文中所公开的实施例描述的各示例的单元及算法步骤,能够以电子硬件、或者计算机软件和电子硬件的结合来实现。这些功能究竟以硬件还是软件方式来执行,取决于技术方案的特定应用和设计约束条件。专业技术人员可以对每个特定的应用来使用不同方法来实现所描述的功能,但是这种实现不应认为超出本发明的范围。
所属领域的技术人员可以清楚地了解到,为描述的方便和简洁,上述描述的系统、装置和单元的具体工作过程,可以参考前述方法实施例中的对应过程,在此不再赘述。
在本申请所提供的几个实施例中,应该理解到,所揭露的系统、装置和方法,可以通过其它的方式实现。例如,以上所描述的装置实施例仅仅是示意性的,例如,所述单元的划分,仅仅为一种逻辑功能划分,实际实现时可以有另外的划分方式,例如多个单元或组件可以结合或者可以集成到另一个系统,或一些特征可以忽略,或不执行。另一点,所显示或讨论的相互之间的耦合或直接耦合或通信连接可以是通过一些接口,装置或单元的间接耦合或通信连接,可以是电性,机械或其它的形式。
所述作为分离部件说明的单元可以是或者也可以不是物理上分开的,作为单元显示的部件可以是或者也可以不是物理单元,即可以位于一个地方,或者也可以分布到多个网络单元上。可以根据实际的需要选择其中的部分或者全部单元来实现本实施例方案的目的。
另外,在本发明各个实施例中的各功能单元可以集成在一个处理单元中,也可以是各个单元单独物理存在,也可以两个或两个以上单元集成在一个单元中。
所述功能如果以软件功能单元的形式实现并作为独立的产品销售或使用
时,可以存储在一个计算机可读取存储介质中。基于这样的理解,本发明的技术方案本质上或者说对现有技术做出贡献的部分或者该技术方案的部分可以以 软件产品的形式体现出来,该计算机软件产品存储在一个存储介质中,包括若干指令用以使得一台计算机设备(可以是个人计算机,中心服务器,或者网络设备等)或处理器(processor)执行本发明各个实施例所述方法的全部或部分步骤。而前述的存储介质包括:U盘、移动硬盘、只读存储器(ROM,Read-Only Memory)、随机存取存储器(RAM,Random Access Memory)、磁碟或者光盘等各种可以存储程序代码的介质。
以上所述,仅为本发明的具体实施方式,但本发明的保护范围并不局限于此,任何熟悉本技术领域的技术人员在本发明揭露的技术范围内,可轻易想到变化或替换,都应涵盖在本发明的保护范围之内。因此,本发明的保护范围应所述以权利要求的保护范围为准。

Claims (14)

  1. 一种内容分发网络中的调度方法,其特征在于,包括:
    调度系统接收视频客户端发送的播放调度请求;
    响应于该播放调度请求,至少根据多家CDN服务提供商的CDN服务SLA信息确定满足质量要求的目标CDN服务提供商;
    向所述视频客户端返回所述目标CDN服务提供商的CDN节点的信息,以供所述视频客户端向所述目标CDN服务提供商的CDN节点发送播放请求;
    其中,所述CDN服务SLA信息包括以下至少一个:服务用户的总次数,播放成功率、播放失败率、用户服务卡顿总次数、用户服务卡顿比率、回源率、用户下载达标率、服务可靠性参数、起播时延达标率、下载速率。
  2. 如权利要求1所述的方法,其特征在于,所述方法还包括:所述调度系统存储调度规则,所述调度规则由管理员配置;
    所述调度规则包括:
    根据多个视频客户端上报的CDN服务SLA质量参数调整所述多家CDN服务提供商的调度比例,所述多个视频客户端上报的CDN服务SLA质量参数包括以下至少一个:统计周期内播放成功率、用户服务卡顿比、起播时延达标率;或
    根据所述多家CDN服务提供商的CDN节点到调度系统的访问SLA指标调整所述多家CDN服务提供商的调度比例;所述CDN服务提供商的CDN节点到调度系统的访问SLA指标包括回源率;或
    根据依据所述多家CDN服务提供商的SLA服务日志信息调整所述多家CDN服务提供商的调度比例,所述SLA服务日志信息包括以下至少一个:用户下载达标率、服务可靠性参数。
  3. 如权利要求2所述的方法,其特征在于,所述根据多个视频客户端上报的CDN服务SLA质量参数调整所述多家CDN服务提供商的调度比例,包括:
    对预设时间段内的0次卡顿率低于95%的CDN的服务提供商的调度比例下调10%,或
    对预设时间段内播放成功率<98%的CDN的服务提供商的调度比例下调10%。
  4. 如权利要求2所述的方法,其特征在于,根据CDN服务提供商的CDN 节点到调度系统的访问SLA指标调整所述多家CDN服务提供商的调度比例,包括:
    对一个统计周期或多个连续统计周期内的回源率>15%的CDN的服务提供商的调度比例下调10%。
  5. 如权利要求1所述的方法,其特征在于,所述至少根据多家CDN服务提供商的CDN服务SLA信息确定满足质量要求的目标CDN服务提供商,包括:
    将当前统计周期或最近一个完整统计周期内CDN服务SLA信息的数值在预设范围内的CDN服务提供商确定为目标CDN服务提供商。
  6. 如权利要求2或3所述的方法,其特征在于,所述至少根据多家CDN服务提供商的CDN服务SLA信息确定满足质量要求的目标CDN服务提供商,包括:
    将当前统计周期或最近一个完整统计周期内的调度比例在预设范围内的CDN服务提供商确定为目标CDN服务提供商;或
    按照当前统计周期内的播放请求或播放调度请求的次数,以及根据所述多家CDN服务提供商的调度比例,按比例确定所述目标CDN服务提供商。
  7. 如权利要求2或3所述的方法,其特征在于,所述方法还包括:
    按照所述多家CDN服务提供商的调度比例,将所述多家CDN服务提供商划分为至少两个等级;
    所述至少根据多家CDN服务提供商的CDN服务SLA信息确定满足质量要求的目标CDN服务提供商,包括:
    将预设等级的CDN服务提供商确定为目标CDN服务提供商。
  8. 如权利要求2-4或6任一项所述的方法,其特征在于,所述方法还包括:
    接收所述多个视频客户端上报的CDN服务SLA质量参数;或
    接收所述多家CDN服务提供商的CDN节点发送的回源请求,根据所述回源请求统计所述多家CDN服务提供商的回源率;或
    接收所述多家CDN服务提供商的CDN节点上报的SLA服务日志信息。
  9. 一种调度系统,包括:
    调度执行中心,用于接收视频客户端发送的播放调度请求;
    CDN服务质量监测子系统,用于获取多家CDN服务提供商的CDN服务SLA信息;
    调度执行中心,用于至少根据多家CDN服务提供商的CDN服务SLA信息确定满足质量要求的目标CDN服务提供商;向所述视频客户端返回所述目标CDN服务提供商的CDN节点的信息,以供所述视频客户端向所述目标CDN服务提供商的CDN节点发送播放请求。
  10. 如权利要求9所述的调度系统,其特征在于,所述调度系统还包括:
    CDN调度规则管理子系统,用于接收管理员对调度规则的配置操作;
    调度规则库,用于存储所述调度规则;
    所述调度规则包括:
    根据多个视频客户端上报的CDN服务SLA质量参数调整所述多家CDN服务提供商的调度比例,所述多个视频客户端上报的CDN服务SLA质量参数包括以下至少一个:统计周期内播放成功率、用户服务卡顿比、起播时延达标率;或
    根据所述多家CDN服务提供商的CDN节点到调度系统的访问SLA指标调整所述多家CDN服务提供商的调度比例;所述CDN服务提供商的CDN节点到调度系统的访问SLA指标包括回源率;或
    根据依据所述多家CDN服务提供商的SLA服务日志信息调整所述多家CDN服务提供商的调度比例,所述SLA服务日志信息包括以下至少一个:用户下载达标率、服务可靠性参数。
  11. 如权利要求9或10所述的调度系统,其特征在于,所述调度系统还包括:
    CDN内容媒体服务器,用于接收所述多家CDN服务提供商的CDN节点发送的回源请求,并返回所述回源请求对应的媒体内容。
  12. 一种视频客户端,其特征在于,包括存储器、处理器以及存储在该存储器上并可在该处理器上运行的计算机程序,其特征在于,所述处理器执行所述计算机程序时以指令所述视频客户端实现以下操作:
    接收用户的输入的播放请求;
    响应于所述用户的播放请求,生成播放调度请求,
    向所述调度系统发送所述播放调度请求;
    接收所述调度系统根据所述播放请求返回的目标CDN服务提供商的CDN节点的信息;
    向所述目标CDN服务提供商的CDN节点发送所述播放请求;
    接收所述目标CDN服务提供商的CDN节点返回的视频。
  13. 如权利要求12所述的视频客户端,其特征在于,所述处理器执行所述计算机程序时以指令所述视频客户端实现以下操作:
    向调度系统上报CDN服务SLA质量参数,所述CDN服务SLA质量参数包括:以下至少一个:统计周期内播放成功率、用户服务卡顿比、起播时延达标率。
  14. 一种调度系统,包括存储器、处理器以及存储在该存储器上并可在该处理器上运行的计算机程序,其特征在于,所述处理器执行所述计算机程序时以指令所述视频客户端实现如权利要求1-8任一项所述的方法。
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