基于BitTorrent的视频点播系统建模研究

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1、中国科孽技求大孽博士学位论文囤论文题目基于B¨Iorc州t的垫塑土堡堡鱼作者姓名学科专业导师姓名完成时间网络停播聋统与控制摘要关键词：P2PBitTorrent视频点播建模日周期特性瞬间拥挤防火墙AbstractABSTRACTAstheincreasingoftechnologyofbroadband，videoondemand(VoD)hasbeengettingwidelyused．Atpresent，threetechnologiesareusedinVoDsystemstoprovides

2、ervice：1)Unicast，theVoDserverassignserveryuseradifferentdatastream，whichinereasesthecostofserverandbandbroad，andiseasilytocauseflash—crowd．Sounicastishardtosatisfylargescaleuserrequest；2)Multicast，usingMultiplexingtoreducetheloadofserverandbandbroad．Bu

3、ttheexistingdevicesofIntemetContentProvidercannotsupportmulticstwell．Multicaststillhaslimitationinreliabilityandcongestioncontrol，whichhinderstheextensionofmulticasttechnology；3)CDN(ContentDeliveryNetwork)，throughdeployingserverwidelyinintemet，CDNdispe

4、rsesuserrequesttothenearestservertoreducetheloadofserverandbandbroad．Butthewidelydeployedserversincreasethecostandarehardtomanage，chargingaSperbytealsoincreasestheexpenditureofICE·Sothetraditionalclient／servermodelisnotfitforpresentVoDservice．P2PVODtec

5、hnologyattractedmoreandmoreattention．BasedontheobservingandmodelinganalysisofBTsystem，weproposedVoDsystembasedonBTprotocol，thenanalysethesystemthroughmodeling．Ourworkis懿follows：1)ObservedthetwobiggestBTsysteminChina(5q．cornandicefish．org)for41days．111e

6、collecteddataismorethan40GB，includingonlineusercount，usercount，seed，useroffinishingdownload，userIDofuploading．torrentfile，uploadtimeandfilesizeofeveryBTswarm．Basedontheobserveddata,weanalysedthedaily-cycleproperty,abilityofhandlingflash·crowd，free-ridi

7、ngandfilepopularityofBTsystem．2)ThroughanalyzingtheBTprotocolandtheabserveddata,weproposedtheBTsystem’Sabilitymodelinflash-crowdanddaily·cyclemodel．ThroughITTAbstmctcomparingwitlltheabserveddata,weprovedtheveracityofoBrmodel．Accordingtothemodels，weprop

8、osedtheprojectofincreasingBTsystem’Sservicyability．3)Basedontheresearchabove，weproposedthestructureofVoDsystembasedonBTprotoc01．4)WemodeledtheVoDsystembasedonBTprotoc01．Themainresultsandproblemsremainedtobesolvedalepresentedintheconclus