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1、Energy-awareDynamicTopologyControlAlgorithmforWirelessAdHocNetworksYeTian,MinSheng,JiandongLi,YanZhang,JunliangYaoandDiTang(TheStateKeyLabofISN&InformationScienceInstitute,XidianUniversity,Xi’an,Shaanxi710071,China)Abstract—Topologycontrolviaper-nodetransmissionpoweradjustmenthasbeensho
2、wneffectiveinextendingnetworklifetime.However,mostofexistingalgorithmsconstructstatictopologieswhichfailtoconsidertheresidualenergyofnetworknodes,thusinfacttheycannotbalanceenergyconsumptionefficiently.Toaddressthisproblem,alightweightdistributedtopologycontrolalgorithmEDTC(Energy-aware
3、DynamicTopologyControl)isproposedinthispaper.Basedonthelinkmetricreflectingboththeenergyconsumptionratesandresidualenergylevelsatthetwoendnodes,EDTCgeneratesadynamicnetworktopologythatchangeswiththevariationofnodeenergy.Inaddition,withouttheaidoflocationinformation,eachnodedeterminesits
4、transmissionpoweraccordingtolocalnetworkFig.1.Examplenetwork(a)original(b)optimizedunderLSPinformation,whichreducesthecomplexityandoverheadofR&M[7],SMECN[8],LSP[9]andsoon.BythewayofEDTCgreatly.Theoreticanalysisandexperimentresultsshowreducingnodetransmissionpower,theultimategoalofthetha
5、tEDTCpreservesnetworkconnectivityandminimum-costbothclassesaboveistoextendnetworklifetime[2].propertyandcomparedwithotheralgorithms,itcanextendnetworklifetimemoreremarkably.Nevertheless,thelifetimeofnetworks[11],[12],whichiscommonlytakentobethetimeatwhichthefirstnoderunsoutI.INTRODUCTIO
6、Nofenergy,isactuallydeterminedbyboththeresidualenergylevelsandtheenergyconsumptionratesofnetworknodes.Duetotheseverconstraintofbatterypower,energyisaTherefore,itisnecessarytoconsiderseveralfactors,suchasvitalresourceforwirelessdevicesandenergyconservationistrafficloads,residualenergyand
7、transmissionpower,ifoneofthemostimportantissuesinwirelessAdHocnetworkslifetimeisdesiredtobeprolonged.However,mostofthe[1].Topologycontrolthatassignsreducedpowerfornetworkproposedapproacheschieflyfocusonthepowerconsumptionnodeshasbeenshowntobeeffectiveinsavingenergyofnodesandfai
