Trading Delay for Fairness in MAC Design for Cognitive Personal Area Networks

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1、TradingDelayforFairnessinMACdesignforCognitivePersonalAreaNetworksJelenaMisiˇcandVojislavB.Mi´siˇc´RyersonUniversity,Toronto,Ontario,CanadahopfromAbstractInthispaperweinvestigatetheperformanceofchannelktimeacognitivepersonalareanetwork(CPAN)withroundrobinchanneli-1servicewhereeachnodei

2、sallowedtotransmitabatchofupdataexchangefrom/totoµpacketsinonetransmissioncycle.Inordertocontributechanneliassignmentdevicesthatwonreservationreservationcontroltocooperativesensing(andthussupporttheoperationofthebeaconCPAN),eachnodeneedtoperformsensingduty,thedurationofchanneli-1whichi

3、sproportionaltothenumberofpacketssentinabatch,ashoptoregulatedbyavariablepenaltycoefficient.Spectrumsensingcanchanneljbepreemptedbythereceptionactivityofthenodeandresumedinthefollowingsuperframe.Wemodelthissystemandshowtherelationshipbetweendelay,fairnessandstabilitywithrespecttoFig.1.S

4、uperframeandsub-frames.schedulingparameterµ,penaltycoefficientandtrafficload.I.INTRODUCTIONeachnodeisallowedtotransmitafixednumberofpackets,Theshortageofavailablespectrumcanbecountermandeddenotedwithμ,beforebeingassignedasensingduty.Inorderbycognitiveoropportunisticspectrumaccess(OSA),inw

5、hichtoachievethebalancebetweendatatransmission/receptiontheavailablespectrumopportunitiesor‘holes’aredynamicallyandsensing,eachnodeisobligedtoperformsensingfordetectedandusedforcommunicationbyspectrallyagileafixedtimeintervalofkpsuperframesbeforeanyfurtherdevices[1],[3].Initiallyenvisag

6、edforuseinwideareadatatransmissioncanbegranted.(Thisapproachalsoensuresnetworks,OSAtechnologyisequallywellsuitedtowirelesssmoothoperationoftheCPANthroughaccuratechannelpersonalareanetworks(PANs)builtwithinexpensivedevices,sensing.)Receptioncanpreemptsensingandisnotpenalized,whereitcanb

7、ecombinedwithfrequencyhoppingspreadsinceweassumethateachnodewillperformtransmissionandspectrum(FHSS)[6]toofferincreasedperformance,inpartic-receptioninclose,ifnotexactlyequal,proportions.ularreducedinterferencetoandfromprimaryusers’activityThepaperisorganizedasfollows:SectionIIgivesm