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WirelessLAN by Emulator System Ascomparedwithcommunicationonastationaryhost,thequalityofcommunicationonamobilehostcanbeeasilydegradedbecauseoffading,waveinterferenceandsoon.Therefore,quantitativeevaluationofthequalityofaWebserviceonamobilehostisrequired.Especiallyitshouldbedoneinuserviewpointconsideringthatauserfinallydecidesthequality.Notethatthequalityofservice(QoS)inuser’sviewpointisoftenreferredtoasqualityofexperience(QoE).Thus,thispaperalsoadoptstheseterms.ToevaluateQoEofaWebservice,itisnecessaryforactualuserstoutilizetheWebserviceoveranactualnetworkandevaluateitwithsomesubjectivemethods.Inordertodothis,anexperimentermustprepareactualexperimentaldevices,suchasanaccesspoint(AP),somestations(STAs),andsoon.Moreover,iftheexperimenterassumesaWebclienttobeamobilehost,theusers(experimentalsubjects)mustusetheWebservicewhilemovingformanytimes.Thisimposesaheavyburdenontheusersandmakeslowreproducibilityoftheexperiment.Insteadofpreparingactualexperimentalenvironments,wecanconsiderusinganetworksimulatortoevaluateQoSofaWebserviceonamobilehost.However,sincethenetworksimulationisclosedwithinacomputer,usershardlyperformsubjectiveevaluationforsimulatedresults.Therefore,evalua-tionwithnetworksimulatorisnotalwayssuitablefortheQoEassessment SEO Company Kumbakonam hispaperstudiesamethodofevaluatingQoEofWebservicesonamobilehostoverawirelessLANbyusingtheintegratedsimulator/emulatorsystem.Therestofthispaperareasfollows.SectionIIintroducestheintegratedsimulator/emulatorsystem.WeshowourexperimentanditsresultsinSectionsIIIandIV,respectively.Finally,SectionVconcludesourstudy.II.INTEGRATEDSIMULATOR/EMULATORSYSTEMThedevelopedintegratedsimulator/emulatorsystemcanconnectmorethanonerealnetworkwitheachother.Bythesystem,anactualsenderhostcantransmitIPpacketstoanactualreceiveroneviavariouswithamobilehostoverawirelessLANvirtual(simulated)networks.Thesystemisdevelopedonanetworksimulatorns-3[3]andconsistsofsimulatorunitandemulatorone.Theformercanbuildsadesignatedexperimentalenvironmentonthens-3andhandleeventsundertheenvironmentinrealtime.Thelattertransmitsandreceivespacketsbetweenactualinterfacesandsimulatorunit.Byusingthissystem,itispossibletomeasureQoEunderanexperimentalenvironment.III.EXPERIMENTSA.EnvironmentFigure1showsourexperimentalenvironment.AsubjectusestheWebservicesdesignatedbytheexperimenteronthe Webclient.TheWebserverisconnectedtotheWebclientviatheintegratedsimulator/emulatorsystem,whichperformssimulationaccordingtothescenariosdescribedinthenextsubsection.TablesI,IIandIIIshowthespecificationsoftheWebclient,theintegratedsimulator/emulatorsystemandtheWebserver,respectively. ThispaperadoptsashoppingserviceandaWikiserviceastargetWebservices.TheshoppingserviceisaWebservicewhichincludesalotofHTMLfilesandimages,andWikiserviceconsistsonlyHTMLfiles.Astasks,thesubjectssearchsomeproductsdesignedbytheexperimentsfortheshoppingservice,andfindanswersofagivenquestionfortheWikiservice.Wesettasksthatsubjectschooseitemsspecifiedinshoppingservice,andlookforanswersofgivenquestioninWikiservice.Thesubjectsaremenaround20yearsold,andthenumberofthem ExperimentalScenariosAsexamplesofevaluation,theexperimenttreatsthefol-lowingsixexperimentalscenarios,whicharereferredtoasfromEnv1toEnv6forconvenience’ssake.Theyhavetheirowncombinationsofthenumberofaccesspoints(APs),thatofterminalsandthetypeofpropagationlossmodelinthewirelessLAN.Hereweassumethatapedestriancarriesalimitforeachtask,wedealwithonlytheeffectivenessandthesatisfactionasQoEparameters.Wegetthesatisfactionfromthequestionnairetakentosubjects.Inthequestionnaire,weaskwhethertherehasbeennocompletedissatisfactionwiththeWebservice,andweevaluatedtheeffectivenessfromtheachievementofthetask.Inaddition,wealsomeasuretheTCPthroughputandtheelapsedtimetoobtainaWebfileasQoSparameters https://arudhrainnovations.com/