CAJ | 학술논문

为优化流媒体视频点播系统中客户端对数据的缓存调度,使整个系统的播放质量与资源利用率趋向最优,提出一种Tracker引导的缓存调度方法,Tracker收集缓存服务器的负载信息和网络中的数据请求信息,采用基于流行度的预测方法推测下一阶段网络中需要的副本数,以此为根据对客户端缓存建议请求予以响应.客户端以Tracker的建议和自身在邻域网络内感知到的副本数为依据,使用兼顾全局和局部利益的决策算法进行视频数据的缓存操作.模拟结果表明,Tracker引导的缓存调度方法能够有效的保证网络中客户端节点的播放质量,并在一定程度上降低缓存服务器的负担,使整个系统的缓存调度趋向最优.
위우화류매체시빈점파계통중객호단대수거적완존조도,사정개계통적파방질량여자원이용솔추향최우,제출일충Tracker인도적완존조도방법,Tracker수집완존복무기적부재신식화망락중적수거청구신식,채용기우류행도적예측방법추측하일계단망락중수요적부본수,이차위근거대객호단완존건의청구여이향응.객호단이Tracker적건의화자신재린역망락내감지도적부본수위의거,사용겸고전국화국부이익적결책산법진행시빈수거적완존조작.모의결과표명,Tracker인도적완존조도방법능구유효적보증망락중객호단절점적파방질량,병재일정정도상강저완존복무기적부담,사정개계통적완존조도추향최우.
To ensure the QoS and reduce the burden of web server in a multimedia streaming system,a cache scheduling method based on trackers advice is proposed,which guides caching mechanisms in peers by giving advices to peers. All advices are based on the prediction made by tracker server according to the information gathered from peers and proxy servers. On basis of these advices and copy number perceived by themselves,peers can choose appropriate segments of multimedia objects to be cached through decision-making algorithm considering global and local benefit. Simulation results show that this approach can effectively ensure the QoS in local peers and reduce the burden of proxy server in a certain degree and get an optimal solution for the cache scheduling in the whole system.