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1、VerticalHandoffDecisionAlgorithmsforProvidingOptimizedPerformanceinHeterogeneousWirelessNetworksSuKyoungLee,Member,IEEE,KotikalapudiSriram,Fellow,IEEE,KyungsooKim,YoonHyukKim,andNadaGolmie,Member,IEEE异构无线网络优化性能的垂直切换判决算法SuKyoungLee，IEEE会员；KotikalapudiSriram,IEEE高级会员；KyungsooKim,Yoo
2、nHyukKim和NadaGolmie,IEEE会员ManuscriptreceivedJuly18,2007;revisedJanuary9,2008andApril7,2008.FirstpublishedMay14,2008;currentversionpublishedFebruary17,2009.ThisworkwassupportedinpartbytheNationalInstituteofStandardsandTechnology(NIST)/OfficeofLawEnforcementStandardsandinpartbytheMi
3、nistryofScienceandTechnology,Korea,undertheKoreaScienceandEngineeringFoundationGrantR01-2006-000-10614-0.ThereviewofthispaperwascoordinatedbyProf.X.Shen.S.LeeiswiththeDepartmentofComputerScience,YonseiUniversity,Seoul120-749,Korea(e-mail:sklee@cs.yonsei.ac.kr).K.SriramandN.Golmiea
4、rewiththeAdvancedNetworkingTechnologiesDivision,NationalInstituteofStandardsandTechnology,Gaithersburg,MD20878USA(e-mail:ksriram@nist.gov;ksriram25@gmail.com).K.KimiswiththeDepartmentofMathematics,KyonggiUniversity,Suwon442-760,Korea.Y.H.KimiswiththeDepartmentofMechanicalEngineeri
5、ng,KyungHeeUniversity,Yongin446-701,Korea.Colorversionsofoneormoreofthefiguresinthispaperareavailableonlineathttp://ieeexplore.ieee.org.DigitalObjectIdentifier10.1109/TVT.2008.原稿于2007,6,18收到；修改版于2008,1,9收到；第一次发表于2008,5,14；当前版本发表于2009,2,17。这个工作得到了美国技术标准局的支持，还有韩国科技部及韩国科学工程基金会的资助。本文的
6、修订由韩国YonseiUniversity的Prof.X.Shen.S.Lee整理。Abstract—Therearecurrentlyalargevarietyofwirelessaccessnetworks,includingtheemergingvehicularadhocnetworks(VANETs).Alargevarietyofapplicationsutilizingthesenetworkswilldemandfeaturessuchasreal-time,high-availability,andeveninstantaneoushig
7、h-bandwidthinsomecases.Therefore,itisimperativefornetworkserviceproviderstomakethebestpossibleuseofthecombinedresourcesofavailableheterogeneousnetworks(wirelessareanetworks(WLANs),UniversalMobileTelecommunicationsSystems,VANETs,WorldwideInteroperabilityforMicrowaveAccess(WiMAX),et
8、c.)forconnectionsupport.Whenconne
