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1、TCPFlowControlinLossyNetworks:AnalysisandEnhancementParthoP.Mishra,DheerajSanghi,andSatishK.TripathiDepartmentofComputerScience,UniversityofMaryland,CollegePark,MD20742,USAAbstractTCPusesanimplicitfeedbackbasedwindow
owcontrolmechanism.Thewindowsizeisincreasedonreceiptofanackno
2、wledgementanddecreasedondetectionofapacketloss.Thusapacketlossisusedasanindicationofcongestioninthenetwork.InthecourseofexperimentsconductedovertheInternet,wehaveobservedthatpacketlossescanoccurduetoreasonsotherthancongestion.Inthispaper,weuseanalysisandsimulationtoshowthatthecu
3、rrent
owcontrolschemeresultsinasigni cantdropinthethroughputevenifthelikelihoodofnoncongestionrelatedlossisquitelow.Basedonouranalysiswesuggestamodi cationtothecurrentscheme.Experimentalresultsshowthatthemodi edschemeimprovesthroughputsigni cantly.KeywordCodes:C.2.2;I.6.4Keyword
4、s:NetworkProtocols;ModelValidationandAnalysis1.IntroductionTCP[6]isthemostcommonlyusedtransportprotocolintheInternet.Thecongestioncontrolalgorithmcurrentlyembeddedinthe4.3-TahoeBSDUniximplementationwasproposedbyJacobsonandKarels[4](henceforthwerefertothisalgorithmastheJKscheme).
5、ItisnowconsideredasthestandardInternet
owcontrolalgorithm[2].Thusitisimportanttostudytheperformanceofthisalgorithmunderdi erentnetworkoperatingconditions.Whiletherehavebeensomerecentstudiesofthedynamicsofthisalgorithm[5,9,10],theperformanceofthealgorithmunderlossynetworkconditio
6、nshasnotbeenexamined.TheJKalgorithmbelongstoaclassofwindowbasedfeedback
owcontrolalgorithms[3]wherefeedbackfromthenetworkisusedtoadjustthewindowsizeofatransportlevelThisworkissupportedinpartbyRomeLabsandDARPAundercontractF30602-90-C-0010toUMIACSattheUniversityofMaryland.Theview
7、s,opinions,and/or ndingscontainedinthisreportarethoseoftheauthor(s)andshouldnotbeinterpretedasrepresentingtheocialpolicies,eitherexpressedorimplied,oftheDefenseAdvancedResearchProjectsAgency,RL,ortheU.S.Government.ComputerfacilitieswereprovidedinpartbyNSFgrantCCR-8811954.connec
8、tion.IncaseofTCP,thefeedbackusedisimplicit;when
