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1、ArchitectureandPerformanceofSIGMA:ASeamlessMobilityArchitectureforDataNetworksShaojianFu,LiranMa,MohammedAtiquzzaman,Yong-JinLeeTelecommunicationsandNetworksResearchLabSchoolofComputerScience,UniversityofOklahoma,Norman,OK73019-6151,USA.Email:{sfu,lr
2、ma,atiq,yjlee}@ou.eduAbstractTheInternetEngineeringTaskForcehasdevelopedSeamlessIPdiversitybasedGeneralizedMobilityArchitectureMobileIPtohandlemobilityofInternethostsatthenetwork(SIGMA).ThenwecompareSIGMAÕsperformancewithvari-layer.MobileIP,however,s
3、uffersfromanumberofdrawbacksousMIPv6enhancements.Similarinprincipletootherrecentsuchashighhandoverlatency,packetloss,andconflictwithtransportlayerhandoverschemes[7],thebasicideaofSIGMAnetworksecuritysolutions.Inthispaper,wedescribeandevaluatetheperfor
4、manceofSIGMA,aSeamlessIPdiversitybasedistoexploitIPdiversitytokeeptheoldpathaliveduringGeneralizedMobilityArchitecture.SIGMAutilizesIPdiversitytotheprocessofsettingupthenewpathtoachieveaseamlessachieveaseamlesshandoverofamobilehost,andisdesignedtohan
5、dover.solvemanyofthedrawbacksofMobileIP.VariousaspectsoftheRecently,increasingnumberofmobilenodesareequippedperformanceofSIGMAandMobileIPv6enhancementshavebeenwithmultipleinterfacestotakeadvantageofoverlaynetworkscompared.Criteriaforperformanceevalua
6、tionincludehandoverlatency,packetloss,throughput,andnetworkfriendliness.(suchasWLANandGPRS).ThedevelopmentofSoftwareRadiotechnologyalsoenablesintegratingmultipleinterfaceI.INTRODUCTIONcardsintooneinterface.MobilitysupportingprotocolsshouldMobileIP(MI
7、P)isthestandardproposedbyIETFtohandlebeabletoutilizethesenewhardwareadvancestoimprovemobilityofInternethostsformobiledatacommunication.Fortheperformance.AnewtransportprotocolproposedbyIETF,example,itenablesaTCPconnectiontoremainaliveandcalledStreamCo
8、ntrolTransmissionProtocol(SCTP),hasreceivepacketswhenamobilehostmovesfromonepointrecentlyreceivedmuchattentionfromtheresearchcommu-ofattachmenttoanother.Severaldrawbacksexistwhenusingnity[8].Multihomingisabuilt-infeatureofSCTP,whichMIPinamobilecomput
