一种输出功率分级的无线传感网络数据收集机制

？Thedatagatheringmannerofwirelesssensornetworks,inwhichdataisforwardedtowardsthesinknode,wouldcausethenodesnearthesinknodetotransmitmoredatathanthosefarfromit.Mostdatagatheringmechanismsnowdonotdowellinbalancingtheenergyconsumptionamongnodeswithdifferentdistancestothesink,thustheycanhardlyavoidtheproblemthatnodesnearthesinkconsumeenergymorequickly,whichmaycausethenetworkrupturefromthesinknode.ThispaperpresentsadatagatheringmechanismcalledPODA,whichgradestheoutputpowerofnodesaccordingtotheirdistancesfromthesinknode.PODAbalancesenergyconsumptionbysettingthenodesnearthesinkwithloweroutputpowerandthenodesfarfromthesinkwithhigheroutputpower.SimulationresultsshowthatthePODAmechanismcanachieveevenenergyconsumptionintheentirenetwork,improveenergyefficiencyandprolongthenetworklifetime.