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1、ABSTRACTprotocol.Thecluster-headworkforbalancenodeofLEACHprotocolleadstothevarianceonpowerconsumption.LEACHprotocoldecreasethepowerconsumptionandprolonglife-cyclebyadoptingmechanismsmentionedabove.However,flawsofLEACHexistforitsdesign.Forinstance,themechanismofaveragingdistributionofthecluster-
2、headworktoeverynoderequiresthesameinitialpowerstorageforeverynodeandsamepowercomsumptionforevercluster-headnode,whilethecluster-headpowerconsumptionmaybevarioussincethevariouspowerconsumptionofcommunicationbetweencluster-headsinknodesbecauseofthedifferencedistancebetweennetworkingareaandbasesta
3、tions.Furthermore,differentmassofnodesalsoleadtothevarianceofinitialpowerstoragebetweennodesinthenetwork.AllthesetwosituationwillleadtothefailofenergybalancemechanisminLEACH.ThisisthereasonwhyLEACHisnotapplicableinmanysituations.Inthelastpartofthiswork,proposedTwoimprovedscheme.animprovementofL
4、EACH,LEACH-FC(LEACH-ForwardedByTheClusterHead),hasbeenproposedtosolvetheproblemofthequickconsumptionofenergyfornodesfaraway.Amechanism,solvetheproblembyusingthecluster-headnodewhichisnearthesinknodetosharethepowerconsumption,hasbeenadopted.Andanotherimprovement,LEACH-SE(LEACH-SelectCusterHeadBy
5、Energy)whichselectscluster-headbasedontheparameterofpowerstorage,hasbeenproposedtosolvetheproblemthatLEACHcanonlybeapplicableforthesituationthatallnodesinthenetworkhavethesameinitialpowerstorage.Twoexperimentshasbeenconductedtovarifytheeffectivityofthesetwoimprovement.Alltheabovementionedimprov
6、ementsarealllaunchedtheframworkofLEACHtoassuretheadvantageofLEACH.Inthesenewprotocol,themostvaluableattemptistheadoptionofenergybalancmechanism,whichcannotonlybeusefulforajustmentofnodes'varianceinthenetworktolowertheenergyconsumptionintheprocessofnodes'workdistribution,butalsogoodforresponding
7、theemergencyandaccidenttoassurethebalanceofenergyconsumptionintheworkdistributionofthenetwork.Keywords:Wirelesssensornetworks,LEACHprotocol,Clustering,DistributedAlgorithms,LifeCyclIV萬方數(shù)據(jù)目錄目錄第一章緒論..................................
