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1、ModelsandAnalysisofTCC/AQMSchemesoverDi®ServNetworksJahwanKoo1,JitaeShin1,SeongjinAhn2,andJinwookChung11SchoolofInformationandCommunicationsEngineering,SungkyunkwanUniv.Chunchun-dong300,Jangan-gu,Suwon,Kyounggi-do,Koreafjhkoo,jwchungg@songgang.skku.ac.kr,
2、jtshin@ece.skku.ac.kr2DepartmentofComputerEducation,SungkyunkwanUniv.Myeongnyun-dong3-ga53,Jongno-gu,Seoul,Koreasjahn@comedu.skku.ac.krAbstract.QoS-enablednetworksconsistofmajorfunctions:oneisaTCPcongestioncontrol(TCC)mechanismatasource/sinknodeandtheothe
3、risanactivequeuemanagement(AQM)schemeataninter-mediatenode.Inthispaper,weintroducethemajorTCCmechanismsandAQMschemes,andprovideanalyticalmodelsandsimulation-basedcomparisonsoftheseTCC/AQMschemesforthepurposeofidentifyingthereciprocalrelationshipbetweenTCC
4、mechanismsandAQMschemesinQoS-enablednetworks.Theresultsshowthattheequilibriumanddy-namicsoftheunderlyingnetworkdependsontheharmonybetweentheTCC/AQMpairs.TheNewReno/PIpair,afeedback-basedmechanismencompassingbothnetworkandend-systems,canenhancetheperfor-ma
5、nceofpacketlossanddelaysensitiveapplications.Inouropinion,anappropriatecombinationofactivequeuemanagementfromthenet-workandTCPsourcereactionwouldprovideane®ectivesolutiontotheinstantaneousnetwork°uctuationwhichoccursontheInternet.1IntroductionMillionsofus
6、ershavestartedtousewiredand/orwirelessnetworksandtheamountoftra±chasincreasedconsiderably.Inaddition,newpeer-to-peerap-plicationssuchasNapster,Kazza,ande-donkeyhaveledtoanincreaseintheamountoftra±c,andtherehasalsobeenasigni¯cantriseintheamountofmultimedia
7、tra±csuchasaudioandvideo.Onesigni¯canttechnologicalbreak-throughwhichfacilitatedthisgrowthwastheintroductionofcongestioncontrol[1],whichallowedmanyuserstosharethenetworkwithoutcausingcongestioncollapse.Althoughthebest-e®ortservice,whichwasusedintheearlyda
8、ysoftheInternet,wasadequateaslongastheapplicationsusingthenetworkwerenotsensitivetovariationsinlossesanddelays,itisnolongeradequate,duetotheexplosioninthenumberofdi®erentapplications.Tosolvethisproblem,inthelastfewy
