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1、KASHIHARALAYOUT4/5/072:46PMPage28FUTURECONVERGEDWIRELESSANDMOBILITYPLATFORMSERVICE-ORIENTEDMOBILITYMANAGEMENTARCHITECTUREFORSEAMLESSHANDOVERINUBIQUITOUSNETWORKSimportantroleofubiquitousnetworksasubiqui-tousWLANs.HIGERUKASHIHARAInubiquitousWLANs,amobilenode(MN),NARAINSTITUTEOFSCIENCEAN
2、DTECHNOLOGYcanaccesstheInternetthroughanAPatanyKAZUYATSUKAMOTOANDlocation.However,astheMNmaymovewhileYUJIOIE,KYUSHUINSTITUTEOFTECHNOLOGYusingdiverseapplications,itwillexperiencenumeroushandoversbetweendifferentIPsub-netsbecauseofthenarrowcoverageofaWLAN,andthecommunicationmaybedisconn
3、ectedduetoachangeintheIPaddressoftheMN.TosupportmobilitydespiteachangeofIPaddress,ABSTRACTmobilitymanagementschemessuchasMobileIP(MIP)[2]andmobileStreamControlTrans)'20.870080TD0Tc(-CN(1)CN(10)missionProtocol(mSCTP)[3]wereproposed.InubiquitouswirelessLANs,amobilenodeHowever,thedegrada
4、tionofcommunication100Mbislikelytomovebetweenmanyaccesspointsqualityduringhandovercanneverinherentlybe10mswhileusingcertainapplications.However,intheavoidedwhicheverexistingmobilitymanagementconventionalInternetarchitecture,anMNcanschemeisemployed.Morespecifically,theMNneverinherently
5、avoidthedegradationincom-30mcannotsendorreceivepacketsduringhandovermunicationqualityduringhandover.Toachieveprocessesduetolayer2and3handoveropera-AP1AP2seamlesshandover,weproposeaservice-orient-(802.11b)(802.11b)tions.Furthermore,communicationqualityisedmobilitymanagementschemetoaddr
6、esssensitivetochangesinwirelesslinkconditions.applicationquality.Inthisarticle,wefirstclarifyTherefore,toachieveseamlesshandover,theMN(10)threerequirementsforachievingseamlesshan-followingthreerequirementsshouldbesatisfied:dover.Wethendescribeourconceptoftheser-MN(1)4km/h•Initiationof
7、handoverbasedonpromptandvice-orientedmobilitymanagementscheme,reliabledetectionofchangeinwirelesslinkwhichsatisfiesallthreerequirements.Ourmainconditioncontributionistheproposalofaschemeofhow•EliminationofcommunicationinterruptionIntheconventionaltoproperlyusethenumberofframeretransmi
8、s-due
