基于PEERCAST的P2P流媒体技术研究与设计

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1、西南交通大学硕士学位论文基于PeerCast的P2P流媒体技术研究与设计姓名：杨雪申请学位级别：硕士专业：计算机软件与理论指导教师：尹治本20080501Abstract，Inrecentyears，streamingmediahasgraduallybecomethemainconsumptionofmehltenlet．Conventionalstreamingmediaservicemainlyworksbythe‘‘Client．Server”modcinwhichtheservfffconnectseachclien

2、tinaunicastway．Howev％astheinformationprocessedbythestreamingmediasystem15multimediadatawhichhasmetraitsofhighbandwidthandlongduration，theresourcgslikebaIldwidm，processabilityandSOontheserversidewillbeconsumedaway日∞jcld舅whichbecomesthebottleneckofthewholesystem。There

3、fore，researchingP2Ps仃eamingmediatechnologytakesallimportantsignificanceforsolvingtheser、，efsidebottleneckprobleminthestreamingmediaapplication·hlordertotakeadeepinsightintoP2Pstreamingmediatechnology,thisthesist郴madeanin—depthanalyzationofthenowmostrepresentativeope

4、n-sourceproJectofP2Pstreamingmediatechnology—PeerCast．Intheconditionoflackingc伽Fc．1ativedocum∞ts，itsinternalmechanismandrealizationprincipleislearnedbyusingresearchnlemdslikeexperimentingrepeatedly’outputinglogsandanalyzingthecodes锄dsomeproblemswithitsdisconnect&rec

5、onnectmechanismandnodc-selectingmechanismarediscovered．Tosolvetheseproblems，improvedschemesareraised，andfurthermorerealizedandtested．ThismesishasmainlyimprovedPeerCastfromtwoaspects：thefirstisitsdisconnect＆reconn。ctmechanism；thesecondisitsnode-selectingmechanism·Acc

6、ordingtotheresultsofthedisconnect&reconnectexperiment，ifonenodemthed眦a们nsmittiI培treeofPeerCastquits，thedownrivertransmittingtreewilltotallydisnliss雒dallthedownrivernodesbegintosearchfornewsourcesrespectively．Thisresultsintomanyproblems：011onehand，thereconnectingtime

7、takenbyeachsinglenodeislongandthereconnectingSUCCesSprobabilityislow；ontheotherh狮d，“irlvolvesrIebuildingthetransmittingtreewhichwillcauseservicequalityinstabilityoft11ewholenetwoIk．Inthisthesis，animproveddisconnect&reconnectschemelSraisedallditisprovedbytimecomplexi

8、tycomparisonandresultsofcomparativeexp砸meIltsthattheimprovedschemeadvanceoV叮theoriginalschemeintheaspectsofreconnectionspeed，reconnections