abstract - chennaisunday摘要：chennaisunday

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CloudComputingForMobileUsers:CanOffloadingComputationSaveEnergy?ABSTRACTThecloudheraldsaneweraofcomputingwhereapplicationservicesareprovidedthroughtheInternet.Cloudcomputingcanenhancethecomputingcapabilityofmobilesystems,butisittheultimatesolutionforextendingsuchsystems'batterylifetimes?Cloudcomputing1isanewparadigminwhichcomputingresourcessuchasprocessing,memory,andstoragearenotphysicallypresentattheuser’slocation.Instead,aserviceproviderownsandmanagestheseresources,andusersaccessthemviatheInternet.Forexample,AmazonWebServicesletsusersstorepersonaldataviaitsSimpleStorageService(S3)andperformcomputationsonstoreddatausingtheElasticComputeCloud(EC2).Thistypeofcomputingprovidesmanyadvantagesforbusinesses—includinglowinitialcapitalinvestment,shorterstart-uptimefornewservices,lowermaintenanceandoperationcosts,higherutilizationthroughvirtualization,andeasierdisasterrecovery—thatmakecloudcomputinganattractiveoption.Reportssuggestthatthereareseveralbenefitsinshiftingcomputingfromthedesktoptothecloud.1,2Whataboutcloudcomputingformobileusers?Theprimaryconstraintsformobilecomputingarelimitedenergyandwirelessbandwidth.Cloudcomputingcanprovideenergysavingsasaservicetomobileusers,thoughitalsoposessomeuniquechallenges.EXISTINGSYSTEM:Energyefficiencyisafundamentalconsiderationformobiledevices.Cloudcomputinghasthepotentialtosavemobileclientenergybutthesavingsfromoffloadingthecomputationneedtoexceedtheenergycostoftheadditionalcommunication.Existingstudiesthusfocusondeterminingwhethertooffloadcomputationbypredictingtherelationshipsamongthesethreefactors.ThecomputationoffloadingdependsonthewirelessbandwidthB,theamountofcomputationtobeperformedC,andtheamountofdatatobetransmittedD. PROPOSEDSYSTEM:Aserviceproviderownsandmanagesresources(suchasprocessing,memory,storage),andusersaccessthemviatheInternet.Forexample,AmazonWebServicesSimpleStorageService(S3):letusersstorepersonaldataElasticComputeCloud(EC2):performcomputationsonstoreddata·Thereareseveralbenefitsinshiftingcomputingfromthedesktoptothecloud.·Theprimaryconstraintsformobilecomputingarelimitedenergyandwirelessbandwidth.Advantages·Lowinitialcapitalinvestment·Shorterstart-uptimefornewservices·Lowermaintenanceandoperationcosts·Higherutilizationthroughvirtualization·Easierdisasterrecovery·4··MODULEDESCRIPTION:NumberofModulesAftercarefulanalysisthesystemhasbeenidentifiedtohavethefollowingmodules:1.SavingEnergyForMobileSystemsModule.2.OffloadingComputationToSaveEnergyModule.3.MakingComputationOffloadingMoreAttractiveModule.4.ChallengesAndPossibleSolutionModule. 1.SavingenergyForMobileSystemModule:Mobilesystems·Variousstudieshaveidentifiedlongerbatterylifetimeasthemostdesiredfeatureofsuchsystems.·Manyapplicationsaretoocomputationintensivetoperformonamobilesystem.Ifamobileuserwantstousesuchapplications,thecomputationmustbeperformedinthecloud.·Otherapplicationscanrunonamobilesystem.However,theyconsumesignificantamountsofenergy,suchasImageretrieval,voicerecognition,gaming,andnavigation.·Eliminatecomputationalltogether.Themobilesystemdoesnotperformthecomputation.Instead,computationisperformedsomewhereelse.2.OffloadingComputationToSaveEnergyModule:·Client-servercomputing:serviceprovidersmanagingprogramsrunningonservers·Cloudcomputing:Allowscloudvendorstorunarbitraryapplicationsfromdifferentcustomersonvirtualmachines.·Cloudvendorsthusprovidecomputingcycles,anduserscanusethesecyclestoreducetheamountsofcomputationonmobilesystemsandsaveenergy.·Cloudcomputingcansaveenergyformobileusersthroughcomputationoffloading·Virtualization:Letsapplicationsfromdifferentcustomersrunondifferentvirtualmachines,therebyprovidingseparationandprotection.·Energyanalysisforcomputationoffloading: 3.MakingComputationOffloadingMoreAttractiveModule:·Energysavedbycomputationoffloadingthroughwirelessbandwidth,amountofcomputationtobeperformed,amountofdatatobetransmitted.·Client-ServerModel:Becausetheserverdoesnotalreadycontainthedata,allthedatamustbesenttotheserviceprovider.·CloudComputing:Thecloudstoresdataandperformscomputationonit.Google’sPicasa,AmazonS3,AmazonEC2.4.ChallengesAndPossibleSolutionModule:·PrivacyandSecurityoBecausethedataisstoredandmanagedinthecloud,securityandprivacysettingsdependontheIT(informationtechnology)managementofthecloudprovides.oSometypesofdatacannotbestoredinthecloudwithoutconsideringtheseprivacyandsecurityimplications.oOnepossiblesolutionistoencryptdatabeforestorage ·ReliabilityoAmobileuserperformingcomputationintheclouddependsonthewirelessnetworkandcloudservice.·RealTimedataSOFTWAREREQUIREMENTS:OperatingSystem:WindowsTechnology:JavaandJ2EEWebTechnologies:Html,JavaScript,CSSIDE:MyEclipseWebServer:TomcatToolkit:AndroidPhoneDatabase:MySQLJavaVersion:J2SDK1.5HARDWAREREQUIREMENTS:Hardware:PentiumSpeed:1.1GHzRAM:1GBHardDisk:20GBFloppyDrive:1.44MBKeyBoard:StandardWindowsKeyboardMouse:TwoorThreeButtonMouseMonitor:SVGA