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1、TheContikiMACRadioDutyCyclingProtocolAdamDunkelsadam@sics.seSICSTechnicalReportT2011:13ISSN1100-3154December2011Abstractposed(seee.g.DuttaandDunkelsforamorethoroughreviewofdutycyclingmechanisms[9]).ThisdocumentLow-powerwirelessdevicesmustkeeptheirradiodescr
2、ibestheContikiMACdutycyclingmechanism,thetransceiversoffasmuchaspossibletoreachalowpowerdefaultdutycyclingmechanisminContiki2.5consumption,butmustwakeupoftenenoughtobeabletoContikiMACisdesignedtobesimpletounderstandreceivecommunicationfromtheirneighbors.Thi
3、sreportandimplement.ContikiMACusesonlyasynchronousdescribestheContikiMACradiodutycyclingmechanism,mechanisms,nosignalingmessages,andnoadditionalthedefaultradiodutycyclingmechanisminContiki2.5,packetheaders.ContikiMACpacketsareordinarylinkwhichusesapowereffic
4、ientwake-upmechanismwithlayermessages.ContikiMAChasasignificantlymoreasetoftimingconstraintstoallowdevicetokeeptheirpower-efficientwake-upmechanismthatpreviousdutytransceiversoff.WithContikiMAC,nodescanparticipatecyclingmechanisms.Thisisachievedbyprecisetimin
5、ginnetworkcommunicationyetkeeptheirradiosturnedthroughasetoftimingconstraints.Inaddition,Contiki-offforroughly99%ofthetime.ThisreportdescribestheMACusesafastsleepoptimization,toallowreceiverstoContikiMACmechanism,measurestheenergyconsump-quicklydetectfalse-
6、positivewake-ups,andatransmissiontionofindividualContikiMACoperations,andevaluatesphase-lockoptimization,toallowrun-timeoptimizationtheefficiencyofthefastsleepandphase-lockoptimiza-oftheenergy-efficiencyoftransmissions.tions.ThemechanismsinContikiMACareinspir
7、edbyex-istingdutycyclingprotocols.Theideaofperiodic1Introductionwake-upshasbeenusedbymanyprotocols,suchasB-MAC[21],X-MAC[1],andBoX-MAC[18].TheLow-powerwirelessdevicesmustmaintainstrictpowerphase-lockoptimizationhasbeenpreviouslysuggestedbybudgetstoattainyea
8、rsoflifetime.OfallcomponentsWiseMAC[11]andhassincebeenusedbyotherproto-onalow-powerwirelessdevice,thewirelesstransceivercolsaswell[14].Theuseofmultiplecopiesofthedataoftenhasthehighestpowerconsumption.
