Second Users Operation Strategies Based on Primary Users Activities.pdf

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Second Users Operation Strategies Based on Primary Users Activities.pdf

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ScientificIournalofInformationEngineering February2014，Volume4，Issue1，PP．1—7 SecondUsersOperationStrategiesBasedon PrimaryUsersActivities JinTian确 XiaoTianeLiqingQianl 。 , 1．SchoolofInformationTechnology,InstituteofJinlingTechnology,Nanjing211169，China 2．ZhonghuanInformationCollegeofTianjinUniversityofTechnology，Tianjin300380，China Email：tj．tech@jit．edu．cn Abstract Spectrum handoffofCognitiveRadioisveryimportantandkeytaskintermsofPUsreappearonchannelSUsarecommunicating on．ThepaperproposesthatSUsstarttosearch freelicensechannelwhentheymeetoneofthreetriggerconditionswithout periodicalsense．Afterthesearchresultchannelsraeanalyzed，htesechannelswillbeselectedaccordingtominimum spectrum handoffnadinfrequentspectrum handoff inaperiod．Thepaper’screativecontributionfocusesonfuturechannel’srfeetime ． As advnacedSpectrumHnadoff(ASH)，candidatechannelsshouldhavelonglifetimetosuitSUs’trnasmission．Evenifarfeechannel isreadyforSUshna dofi,SUsdon’tswitchuntilPUsrealreappearonchnanelSUsarecommunicatingon ． A seriesofvisionis provedthatASH effectsandhastheadvna tageoverordinaryproactivespectrum hnadoff． Keywords：CognitiveRadio；SpectrumHandoff；PUActivity；ChannelLifeTime；SwitchingNumber 1 INTRODUCTION InCognitiveRadioNetworks(CRNs)，spectrum mobilitycausesanewtypeofhandoffreferredtoasspectrum handoff 【1]．InCRNs，thenumberandcharacteristicofavailablespectrum atanewlocationmayvarywithlocal PrimaryUsers(PU)behavior．Moreover，thespectrum handoffsinCI sincurlongerdelaysortemporary communicationdisruptionsasSecondaryUsers(SUs)mustserachfo