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1、上海大学硕士学位论文ABSTRACTInrecentyears,therehasbeenexplosivedevelopmentintheInternet,andtheamountofusersandnetworkapplicationshasincreasedrapidly.Inthepast,Internetcouldonlytransmitasinglekindofdatum,butnowmultipletypesofdata,suchasvideodata,audiodataandpictures,canbetra
2、nsmitted.Withincreasingnetworkapplicationsandusers,thefrequencyofoccurrenceofnetworkcongestionrisestoagreatextent.Theemergenceofnetworkcongestionreducesnetworkthroughout,increasesdatatransmissiondelayandtherateofloss,anddamagesthequalityofnetworkservicesbadly.Cons
3、equently,itisveryessentialtodoresearchoncongestionandcongestioncontrol.Intheareaofcongestioncontrol,researchersathomeandabroadhavemadeverygreatachievements.PresentTCPcongestioncontrolmechanismandactivequeuemanagementalgorithmshaveplayedanimportantroleinavoidingand
4、dealingwithnetworkcongestion.However,furtherresearchshouldbemadeonhowtoavoidcongestionmoreefectively认complicatedenvironments,howtomakedifferentstreamssharebandwidthimpartiallyandhowtoprovidegoodstabilityforthelengthofbuferqueueFirst,thisthesisgivestheconceptandess
5、enceofcongestionandsummarizessystematicallyrecentresultsofresearchonnetworkcongestion,thenfurtherresearchismadeoncongestioncontrolmechanismsforTCPcomponentsonendstationsandforIPcomponentsonnetworkdevices,suchasgateways,routersetc,finallythethesisclarifiestheauthor
6、'sopinionsoncongestioncontrolandputsforwardtwoalgorithmsincludingTCPseWIWOandSREDweFD.ExperimentsshowthatTCPWIWOreducestransmissiontimeforshortwebdatainhttpapplications,improvestheperformanceofshortdatatransmissionandhasTCP-friendlinessproperty.Inaddition,SREDFDpr
7、ovidesgoodimpartialityfordifferentdataflowsandprovidesgoodstabilityforthelengthofbuferqueue.NetworkSimulator(NS)isasortoffamousnetworksimulatorsoftwarewidelyusedathomeandabroad,andNSprovidesmuchconvenienceinanalyzingandevaluatingnetworkperformance.Experimentswitht
8、hetwoalgorithmsincludingTCP_WIWOandSIZE几FDaremadeusingNS.ThethesisexploresmethodsofcongestioncontrolinTCP/IPnetworksandIhopethiswillcontributetoresearch
