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1、AbstractInwirelessubiquitousenvironment,multiplewirelesstechnologiescoexistandterminalsarevaried.Meanwhile,asingledevicehasbeenunabletomeetusers9deinandofhighQualityofService(QoS).Inthiscase,virtualterminalsystembasedoncooperationofterminalsemergesasthetimesrequire.Characte
2、risticsandcapabilitiesofmultipleterminalsarefused,therebyprovidinghighQualityofExperience(QoE)forusers-Onthebasisofthis,thehandofftechnologyasoneofkeyofvirtualterminalsystemisresearchedinthisthesis.Basedoncollaborativehandofftechnology,twoscenariosi.e.auserwithmultipletermi
3、nalsandmultipleuserseachwithaterminalaremainlydiscussed.Themajorworksareasfollows:Firstly,thebasicconcept,characteristics,keytechnologiesandmainapplicationsofvirtualterminalsystemareintroduced.Thenmaincharacteristicsofverticalhandoffanditstypicalscenesarebrieflyintroduced.S
4、econdly,therelatedconceptsofverticalhandofftechnologyareintroducedinwirelessubiquitousenvironment.Then,variousverticalhandofftechnologiesbasedondecisioncriterionaresummarizedandcompared.Thirdly,thetheoreticalanalysisofthehandofftriggertimeselectionisintroduced.Then,analgori
5、thmisproposedtopredicttheoptimalhandofftriggertimethroughtheestimationofhandoffdelayandthepredictionofreceivedsignalstrength(RSS).Simulationresultsshowthatthisalgorithmcaneffectivelyreducetheprobabilityofhandofffailureandthepacketlossratio.Finally,regardingtotheverticalhand
6、offamongmultipleusers,aterminalpredictionalgorithmisproposedthroughtheconstructionofrevenuefunctionandthepredictionofnetworkparameters.Simulationresultsshowthatthisalgorithmcanmakeusersobtainmorerevenueandeffectivelyreducethepacketlossratio.Keywords:Wirelessubiquitousenviro
7、nment^Virtualterminal,Prediction,Terminalhandoff目录第一章绪论11.1研究背景及意义11.2虚拟终端系统技术概述11.3虚拟终端系统切换存在问题概述41.3.1主要特点41.3.2典型场景51.4主要工作和内容安排7第二章无线泛在环境下垂直切换的研究现状92.1技术简介92.2研究现状142.2.1基于接收信号强度判决准则切换技术142.2.2基于距离和速度预测判决准则的切换技术142.2.3基于多属性决策判决准则的切换技术152.2.4比较与总结152.3本章小结16第三章面向单用户多终端协同
8、移动场景的切换技术173.1系统模型173.2理论模型183.2.1切换耗吋估计193.2.2AR预测模型213.2.3确定触发时刻233.3切换流程263.4仿真
