媒體分發(fā)應(yīng)用中基于內(nèi)容流行度緩存技術(shù)的研究.pdf

1、華中科技大學(xué)碩士學(xué)位論文媒體分發(fā)應(yīng)用中基于內(nèi)容流行度緩存技術(shù)的研究姓名：牛振興申請學(xué)位級別：碩士專業(yè)：通信與信息系統(tǒng)指導(dǎo)教師：程文青20060508IIAbstractWithpopularizingthetypicalstreamsystemsuchasVideoonDemVideoConferenceELearningetcthemultimediatraffictakesthelargestptioninthecurrentInt

2、ertraffic.Sothechallengeistoprovidemultimediaservicesefficientlyscalable.Todatemultimediadistributionservicesbasicallyfallintothreecategiesbasedonarchitecture:1)centralizedmultimediadistribution2)contentdistributionwk(CD

3、N)basedmultimediadistribution3)peertopeer(P2P)wks.Withvaryingactersfacingdiversechallengetheyaredealtwithdifferently.ThisthesisaddressesonthecacheschemefmediadistributionunderCDNbasedP2Pwkbasedarchitecture.FCDNbasedarchi

4、tecturebecausetheresourcesuchasmemyislimitedweshouldmakeuseofthemefficientlytoimprovetheperfmanceofsystems.FP2Pbasedarchitectureeverynodeinthewkwillcontributepartofitsresourceplayasnotonlyclientbutalsoserver.Howtoaggrega

5、teutilizethescatteredresourceefficientlyisthekeytothisarchitecture.Memyisalsothemostimptantresourcefsuchsystemsothecacheschemewillbeexploited.ThewksinthisthesishasbeensupptedbytheNaturalScienceFoundationofChina“Interbase

6、dinteractivestreamingdeliverytechnique”(No.60302004)NaturalScienceFoundationofHubei“Streammediacachingbasedonqualitytimetwodimensionattribute”(No.2005ABA264).Thecontributionsofthisthesisinclude:（1）Withthelimitationofcach

7、espaceimprovethestreammediatransmissionqualitylowertheconsumptionofbackbonebwidthisaconflict.AnewstreammediacachingtransmissionschemewhichcombineswithFGScodinghasbeenproposedinthisthesis.（2）Throughintroducinganovelconcep

8、tionLocalContentPopularityweextendthedefinitionofContentPopularityfromonedimensionofmediaobjecttotwodimensionofmediaobjectspecialarea.Basedonthisconceptionwemodifyenhanceawellknowncacheschemethenmakeadetailcomparisonbetw