Mobile Cloud Computing Review Challenges and Perspectives.docx

Mobile Cloud Computing Review Challenges and Perspectives.docx

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MobileCloudComputingReviewChallengesandPerspectives

MobileCloudComputing:

Review,Challenges,andPerspectives

CloudComputingReport

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信息科学与技术学院

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-************University-

MobileCloudComputing:

Review,Challenges,andPerspectives

Withthedevelopmentofcloudcomputingandmobility,mobilecloudcomputinghasemergedandbecameafocusofresearch.MobileCloudComputingisthecombinationofcloudcomputing,mobilecomputingandwirelessnetworkstobringrichcomputationalresourcestomobileusers,networkoperators,aswellascloudcomputingproviders.Asmobilecloudcomputingcangreatlypromotethedevelopmentandapplicationofcloudcomputing,andcanpromotethedevelopmentandapplicationoftheinternettechnologytoahigherlevel,itisnecessarytograspathoroughunderstandingofthetechnologyinordertopointoutthedirectionoffutureresearch.Firstly,thispaperpresentsareviewonthebackgroundanddefinitionofmobilecloudcomputing,architecture,anditsadvantages.Then,itanalysesthechallengesandsolutionsofmobilecloudcomputing,andthenfocusesonthesecurityandprivacyinmobilecloudcomputing.Intheend,wesummarizeandconcludethispaperandpointoutsomepromisingfutureresearchdirectionsandperspectives.

1.Introduction

Mobiledevicesareincreasinglybecominganessentialpartofhumanlifeasthemosteffectiveandconvenientcommunicationtoolsnotboundedbytimeandplace.Mobileusersaccumulaterichexperienceofvariousservicesfrommobileapplications（e.g.,iPhoneappsandGoogleapps）,whichrunonthedevicesoronremoteserversviawirelessnetworks.Therapidprogressofmobilecomputing[1]becomesapowerfultrendinthedevelopmentofITtechnologyaswellascommerceandindustryfields.However,themobiledevicesarefacingmanychallengesintheirresourcesandcommunications[2].Thelimitedresourcessignificantlyimpedetheimprovementofservicequalities.

Cloudcomputinghasbeenwidelyrecognizedasthenextgenerationcomputinginfrastructure.Cloudcomputingofferssomeadvantagesbyallowinguserstouseinfrastructure,platforms,andsoft-waresprovidedbycloudproviders（e.g.,Google,Amazon,Salesforce,Baidu,etc.）atalowcost.Inaddition,cloudcomputingenablesuserstoelasticallyutilizeresourcesinanon-demandfashion.Asaresult,mobileapplicationscanberapidlyprovisionedandreleasedwiththeminimalmanagementeffortsorserviceprovider’sinteractions.Withtheexplosionofmobileapplicationsandthesupportofcloudcomputingforavarietyofservicesformobileusers,mobilecloudcomputingmobilecloudcomputingisintroducedasanintegrationofcloudcomputingintothemobileenvironment.Mobilecloudcomputingbringsnewtypesofservicesandfacilitiesmobileuserstotakefulladvantagesofcloudcomputing.

Thispaperpresentsacomprehensivesurveyonmobilecloudcomputing.Section2providesabriefoverviewofmobilecloudcomputingincludingdefinition,architecture,anditsadvantages.Section3analysesthechallengesandsolutionsofmobilecloudcomputing.Then,section4focusesonthesecurityandprivacyofmobilecloudcomputing.Finally,wesummarizeandconcludethispaperinsection5,pointoutsomepromisingfutureresearchdirectionsandgivesomeperspectives.

2.Overviewofmobilecloudcomputing

Thetermofmobilecloudcomputingwasintroducednotlongaftertheconceptofcloudcomputing.Ithasbeenattractingtheattentionsofentrepreneursasaprofitablebusinessoptionthatreducesthedevelopmentandrunningcostofmobileapplications,ofmobileusersasanewtechnologytoachieverichexperienceofavarietyofmobileservicesatlowcost,andofresearchersasapromisingsolutionforgreenIT[3].Thissectionprovidesanoverviewofmobilecloudcomputingincludingdefinition,architecture,andadvantagesofmobilecloudcomputing.

2.1Thedefinitionofmobilecloudcomputing

Definitionsofmobilecloudcomputingcanbedividedintotwoclasses.Thefirstreferstocarryingoutdatastorageandprocessingoutsidemobiledevices[4].Mobiledevicesaresimplyterminalsincloudcomputing,onlyintendedtoprovideamoreconvenientwayofaccessingservicesinthecloud.Thebenefitofthisisthatstorageandcomputinglimitationsofmobiledevicesareavoided,andanewlevelofsecurityisprovidedbycentralizingmaintenanceofsecuritycriticalsoftware.

Thesecondclassofdefinitionsreferstocomputingwheredatastorageandprocessingarealsocarriedoutonmobiledevices[5].Theinfrastructureofthecloudisdifferentfromthatofdata-center“pay-as-you-use”cloudcomputing.Eachnodeisownedbyadifferentuserandislikelytobemobile.Usingmobilehardwareforcloudcomputinghasadvantagesoverusingtraditionalhardware.Theseadvantagesincludecomputationalaccesstomultimediaandsensordatawithouttheneedforlargenetworktransfers,moreefficientaccesstodatastoredonothermobiledevices,anddistributedownershipandmaintenanceofhardware.

Inthispaper,mobilecloudcomputingisdefinedascloudcomputingextendedbymobilityandanew“ad-hoc”infrastructurebasedonmobiledevices.Itprovidesmobileuserswithdatastorageandprocessingservicesonacloudcomputingplatform.Usingthisdefinition,weclarifytwodifferencesbetweenmobilecomputingandcloudcomputing.

First,thereisanoverlapbetweenthetwocomputingparadigms.Cloudcomputingaimstoprovideservicestouserswithoutlettingthemknowwheretheseservicesarehostedorhowtheyaredelivered.Mobilecomputingaimstosupportmobilitysothatuserscanaccessresourceswithwirelesstechnology.

Second,itispossibletobuildupcloudswithinmobiledevicesfordatastorageandprocessing.Althoughmobiledevicesnowadaysareweakintermsofenergy,power,storage,andcommunication,thissituationwillbeimproveddramaticallywiththedevelopmentoftechnology.In[5],HyraxshowsthataplatformderivedfromHadoop[6]cansupportcloudcomputingonAndroid[7]smartphones.Itdemonstratesthepossibilitythatacloudcomposedofmobiledevicescanprovidebasicfunctionsandservicesofcloudcomputing.

Figure1.Mobilecloudcomputingarchitecture

2.2Architecturesofmobilecloudcomputing

Fromtheconceptofmobilecloudcomputing,thegeneralarchitectureofmobilecloudcomputingcanbeshowninFigure1.InFigure1,mobiledevicesareconnectedtothemobilenetworksviabasestations（e.g.,basetransceiverstation,accesspoint,orsatellite）thatestablishandcontroltheconnections（airlinks）andfunctionalinterfacesbetweenthenetworksandmobiledevices.Mobileusers’requestsandinformation（e.g.,IDandlocation）aretransmittedtothecentralprocessorsthatareconnectedtoserversprovidingmobilenetworkservices.Here,mobilenetworkoperatorscanprovideservicestomobileusersasauthentication,authorization,andaccountingbasedonthehomeagentandsubscribers’datastoredindatabases.Afterthat,thesubscribers’requestsaredeliveredtoacloudthroughtheInternet.Inthecloud,cloudcontrollersprocesstherequeststoprovidemobileuserswiththecorrespondingcloudservices.Theseservicesaredevelopedwiththeconceptsofutilitycomputing,virtualization,andservice-orientedarchitecture.

ThetypicalmodelofthemobilecloudcomputingisshowninFigure2,whichiscomposedofthreemajorcomponentsincludingmobileterminal,mobilenetworkandcloud[8].

Figure2.Modelofmobilecloudcomputing

Mobileterminalreferstothemobiledevicestoaccessthecloud,suchassmartphones,tabletPCs,notebookcomputersandPDAs.ThecloudincludestheinfrastructurecentersandserversprovidingtheITresourceorinformationservice,e.g.Infrastructure-as-a-Service（IaaS,includingallkindsofservers,databases,storagedevices,parallelanddistributedcomputingsystems）,Software-as-a-Service（SaaS,includingallkindsofsoftware,dataandinformation）,Platform-as-a-Service（PaaS,includingoperationplatform,supportplatformanddevelopmentplatform）.

Themobilecloudcomputingprovidesservicethroughthemobilenetwork,sothemobilenetworkisnecessaryforreliableinformationtransmissionexceptforthemobileterminalandthecloud.

2.3AdvantagesofMobileCloudComputing

NowadaysmoreandmoreusersenjoytheinternetservicesthroughmobileequipmentsuchassmartphonesandtabletPC.Howeverinpracticethestoragecapacityofmobileequipmentislimited,sothattheobtainingresourcesarenotrich.MeanwhilecomparedwithPC,mobileequipmentcalculationabilityislimited,andbattery'ssustainabilityandsharingdataabilitywithPCarepoor.Fortheseveryreasons,mobilecloudcomputingemergesandwillresolvetheseproblems.Thefollowsaretheveryadvantagesofthemobilecloudcomputing,shownasTable1.

Table1.AdvantagesofMobileCloudComputing

Disadvantagesofmobileequipment

Advantagesofmobilecloudcomputing

1

Limitedstoragecapacity

Breakingthroughthehardwarelimits

2

Limitedcalculationability

3

Poorbattery'ssustainability

Intelligentbalancedload

4

PoorsharingdataabilitywithPC

Convenientaccesstodata

On-demandself-service

Oneistobreakthroughthehardwarelimits.Themobilecloudcomputingenablesthecomplexdataprocessingandthemassivedatastorageimplementedinthecloud.Sotheburdenofthecalculationandstorageonmobileequipmentisreduced.Thesecondisintelligenttobalanceloadandtosaveelectricity,sothemobilecloudcomputingcanresolvethesustainproblemofthebatteryandextendthebatterylifeofmobileequipment.Thethirdisconvenientaccess