duty cycle learning algorithm]

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1、AdHocNetworksxxx(2011)xxx–xxxContentslistsavailableatScienceDirectAdHocNetworksjournalhomepage:www.elsevier.com/locate/adhocDutycyclelearningalgorithm(DCLA)forIEEE802.15.4beacon-enabledwirelesssensornetworksRodolfodePazAlberola⇑,DirkPeschNimbusCentreforEmbeddedSystemsResearch,CorkInstituteof

2、Technology,RossaAvenue,Cork,IrelandarticleinfoabstractArticlehistory:ThecurrentspecificationoftheIEEE802.15.4standardforbeacon-enabledwirelesssensorReceived10March2011networksdoesnotdefinehowthefractionofthetimethatwirelessnodesareactive,Receivedinrevisedform14May2011knownasthedutycycle,needst

3、obeconfiguredinordertoachievetheoptimalnetworkAccepted18June2011performanceinalltrafficconditions.Theworkpresentedhereproposesadutycyclelearn-Availableonlinexxxxingalgorithm(DCLA)thatadaptsthedutycycleduringruntimewithouttheneedofhumaninterventioninordertominimisepowerconsumptionwhilebalancing

4、probabilityKeywords:ofsuccessfuldatadeliveryanddelayconstraintsoftheapplication.RunningoncoordinatorWirelesssensornetworks(WSNs)devices,DCLAcollectsnetworkstatisticsduringeachactivedurationtoestimatetheIEEE802.15.4Dutycycleincomingtraffic.Then,ateachbeaconintervalusesthereinforcementlearning(

5、RL)frame-Energyefficiencyworkasthemethodforlearningthebestdutycycle.OurapproacheliminatesthenecessityMachinelearningformanually(re-)configuringthenodesdutycycleforthespecificrequirementsofeachReinforcementlearningnetworkdeployment.Thispresentstheadvantageofgreatlyreducingthetimeandcostofthewire

6、lesssensornetworkdeployment,operationandmanagementphases.DCLAhaslowmemoryandprocessingrequirementsmakingitsuitablefortypicalwirelesssen-sorplatforms.SimulationsshowthatDCLAachievesthebestoverallperformanceforeitherconstantandevent-basedtrafficwhencomparedwithexistingIEEE802.15.4dutycycleadapt

7、ationschemes.Ó2011ElsevierB.V.Allrightsreserved.1.IntroductionTheIEEE802.15.4standard[2],whichiscurrentlythemostwidelyadoptedMACprotocol,definesseveraltypeWirelesssensornetwork(WSN)nodesareusuallybat-ofnodesthattakedifferentrolesduringtheoperational