有线交互数字电视系统设计与系统负载均衡研究(I)

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1、上海交通大学硕士学位论文有线交互数字电视系统设计与系统负载均衡研究姓名：忻力申请学位级别：硕士专业：计算机技术指导教师：张尧弼;陈骥20081001上海交通大学工程硕士学位论文摘要载标准差与负载率的关系进行分析。通过计算负载标准差，验证了两种算法都可以使系统达到负载均衡，其中改进负载优先算法的负载标准差略高于基本负载优先算法，但是它减少了遍历播出卡次数，提高了算法的性能。本文对节目副本放置算法也进行了理论推导。本文的意义在于，随着我国有线电视网络双向改造、数字电视平移不断深入，国内交互电视业务也不断发展，本文在总结现阶段交互电视系统建设经验的基础上，将为新建设的交互数字电视系统提供一定的

2、指导。关键词：有线交互电视、视频点播、负载均衡、请求调度、节目调度II上海交通大学工程硕士学位论文ABSTRACTRESEARCHONINTERACTIVEDIGITALCABLETVSYSTEMANDITSLOADBALANCINGABSTRACTThispaperdiscussesthedesignofintractivedigitalcableTVsystemanditsloadbalancing.Atpresent,theintractivedigitalcableTVsystemisdevelopedandbuiltbycableoperatorinthebackgroundo

3、ftheconstructionintwo-waycablenetworkanddigitalTV.Firstly,thispaperoverviewstheprogressofintractivecableTVindomesticandforeignandtherecentstateofthetechqiueonvideoondemand,thenconcludesthesignificancetobuildandresearchtheintractivedigitalcableTVsystem.Secondly,thispaperfullydiscussesontheend-to-e

4、ndsolutionoftheintractivedigitalcableTVsystemandseveralkeytechnologysappliedinthesystem,describesthecomponentsofthesystemanditsfunctions,andexplainthegeneraldesignbytheactualcase.Thenthepapermakeresearchesonkeytechnologysinthesystem,thatincludetheworkingprincipleofvideoondemandincableTV,thedesign

5、oftheopenstructureinhead-endsystemandthesolutionofvideoserverstructure.Thirdly,thispaperdeeplyresearchesonsystemloadbalancingandfocusonthestrategyinVODrequestschedulingandmediacopyscheduling.IndispatchstrategyofVODrequest,throughintroducingtheloadweightvaluetomeasuretheloadofstreamingcard,thispap

6、erdesignsthebasicminimumloadfirstschedulingalgorithmandimprovedIII上海交通大学工程硕士学位论文ABSTRACTminimumloadfirstschedulingalgorithm.ThenthispapersetupaVODmodelby80/20principal,andproposesastrategyofprogramcopyscheduling.Finally,simulaitionandperformancecomparisonaremade.Thispaperverifiesandcomparestwoalg

7、orithmsofVODrequestschedulingtheoreticallyandmakeasimulaitionbycalculatingloadstandarddeviation,andmakedeductiononmediacopyschedulingstrategyintheory.WiththedevelopmentofintractiveTVinChina,thispaperwillbeconsideredasn