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1、NetworkCodingforLargeScaleContentDistributionChristosGkantsidisPabIoRodriguezRodriguezCollegeofComputingMicrosoftResearchGeorgiaInstituteofTechnologyCambridge,CB3OFD,UKAtlanta.GA.30332.USAEmail:pablo@microsoft.comEmail:gantsich@cc.gatech.eduAbstrucf-Weproposeanewschemeforcontentdktribution
2、usuallyleadstothecollapseoftheaffectedserver.Therefore,oflargefilesthatisbasedonnetworkcoding.Withnetworkend-systemcooperativesolutionscanbeusedtoefficientlyandcoding,eachnodeofthedistributionnetworkisabletogeneratequicklydeliversoftwareupdates,criticalpatches,videos,andandtransmitencodedb
3、locksofinformation.Therandomizationotherlargefilestoaverylagenumberofuserswhilekeepingintroducedbythecodingprocesseasestheschedulingofblockpropagation,and,thus,makesthedistributionmoreefficient.thecostattheoriginalserverlow.ThisisparticularlyimportantinlargeunstructuredoverlayThebestexampl
4、eofanend-systemcooperativearchitecturenetworks,wherethenodesneedtomakeblockforwardingistheBitTorrentsystem,whichbecameextremelypopulardecisionsbasedonlocalinformationonly.WecomparenetworkasawayofdeliveringtheLinuxdistributionsandothercodingtootherschemesthattransmitunencodedinformation(i.e
5、.popularcontent.Bitlbrrentsplitsthefileintosmallblocks,blocksoftheoriginalfile)and,also,toschemesinwhichonlythesourceisallowedtogenerateandtransmitencodedpackets.andimmediatelyafteranodedownloadsablockfromtheWestudytheperformanceofnetworkcodinginheterogeneousoriginserverorfromanotherpeer,t
6、henodebehavesasaservernetworkswithdynamicnodearrivalanddeparturepatterns,clus-forthatparticularblock,and,thus,contributesresourcesforteredtopologies,andwhenincentivemechanismstodiscourageservingtheblock.Furtherdesignchoices,suchasintelligentfree-ridingareinplece.Wedemonstratethroughsimulat
7、ionsofselectionoftheblocktodownload,andparalleldownloadingscenariosofpracticalinterestthattheexpectedfiledownloadtimeimprovesbymorethan20-30470withnetworkcodingcomparedofblocks,improvetheperformanceofthesystem.Foratocodingattheserveronlyand,bymorethan2-3timesd
