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1、1.01.00.80.80.60.60.40.45mspoll,ana.5mspoll,ana.5mspoll,sim.5mspoll,sim.MaximumthroughputMaximumthroughput50mspoll,ana.50mspoll,ana.0.20.250mspoll,sim.50mspoll,sim.500mspoll,ana.500mspoll,ana.500mspoll,sim.500mspoll,sim.0.00.01010010001000010000010100100010000100000TR+TP(5)TR+TP(50)TR+TP(500)TR+TP(5
2、)TR+TP(50)TR+TP(500)Window(frames)Window(frames)BER=1E-7BER=1E-8Fig.5.SSCOPmaximumthroughputvs.windowsize(100Mbit/slink,rtd=10ms,andframesize=1024bytes,andPOLLintervalsof5,50,and500ms)innetworksthatexperienceseverecongestionlosses.InFigure6,simulationresultsarepresentedforahypotheticallinkonaverylos
3、sychannel(p≈10?2).ThisperformancecanbelargelyattributedtoSSCOP'sselectiveretransmissionARQmechanism,whichAgain,threeindependentsimulationrunshavebeensignificantlyoutperformsgo-back-Ninalossy,highaveraged,andthedurationofeachrunwas5secondsbandwidth-delayproductenvironment.(approximately2500frameerror
4、s).TheframewindowwasvariedwhiletheTimer_POLL(2ms)andtheframeVI.CONCLUSIONSANDFUTUREDIRECTIONSsize(128bytes)wereheldconstant.Inaddition,toSSCOPhasbeendesignedasahighspeedprotocolhighlighttheimpactoftheUSTATonprotocolthatcanofferhighthroughputefficiencyinabroadbandperformance,ahypotheticalmodifiedSSCO
5、P(labeledorlossyenvironment.Themainfunctionofthe"SSCOPwithoutUSTAT"),inwhichUSTATprotocolistocorrectforlostorerroredframesthroughmessagetransmissionisdisabled,iscomparedtoretransmission.TheprotocolusesaselectiveSSCOP.Highthroughputefficiencyispossibleinthisretransmissionstrategywhichoffersoptimaleff
6、iciencyenvironment,buttheperformancedegradesmorequicklyperformanceinthebroadbandenvironment.Anumberwhenthewindowisreduced.InFigure5,ahighofotherhighspeeddesignfeatureswerealsothroughput(oftengreaterthan0.8)wasachievablewhenincorporated.thewindowwasreducedtoW=TR+TP,butinthiscase,thethroughputatthatwi
7、ndowsizewasonlySSCOPwasoriginallyintendedtoprovideend-to-approximately0.5.TheUSTATmechanismallowstheenderrorrecoveryforuserdataandlinkprotectionforthroughputtobemaintainedlongerwhenthewindowisATMsigna
