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简介：Owingtothelongpropagationdelayandhigherrorrateofacousticchannels,itisverychallengingtoprovidereliabledatatransferforunderwatersensornetworks.Moreover,networkcodingisprovedtobeaneffectivecodingtechniqueforthroughputandrobustnessofnetworks.Inthispaper,weproposeaReliableBraidedMultipathRoutingwithNetworkCodingforunderwatersensornetworks(RBMR-NC).Disjointmulti-pathalgorithmisusedtobuildindependentactualpaths,ascalledmainpaths.Somebraidedpathsoneachmainpatharebuiltaccordingtothebraidedmulti-pathalgorithm,whicharecalledlogicpaths.Whenadatapacketistransmittedbythesenodes,thenodescanemploynetworkcodingtoencodepacketscomingfromthesamegroupinordertofurtherreducerelativityamongthesepackets,andenhancetheprobabilityofsuccessfuldecodingatthesinknode.Braidedmulti-pathcanmakethemainpathstobemultiplexedtoreducetheprobabilityoflongpaths.ThispapermainlyemployssuccessfuldeliveryratetoevaluateRBMR-NCmodelwiththeoreticalanalysisandsimulationmethods.TheresultsindicatethattheproposedRBMR-NCprotocolisvaluabletoenhancenetworkreliabilityandtoreducesystemredundancy.

简介：Atpresent,mostunderwaterpositioningalgorithmsimprovethepositioningaccuracybyincreasingthenumberofanchornodeswhichresultingintheincreasingenergyconsumption.Tosolvethisproblem,thepaperproposesalocalizationalgorithmassistedbymobileanchornodeandbasedonregiondetermination(LMRD),whichnotonlyimprovesthepositioningaccuracyofnodespositioningbutalsoreducestheenergyconsumption.Thisalgorithmisdividedintotwostages:regiondeterminationstageandlocationpositioningstage.Intheregiondeterminationstage,thetargetregionisdividedintoseveralsub-regionsbytheregiondivisionstrategywiththesmallestoverlapratewhichcanreducethenumberofvirtualanchornodesandlockthetargetnodetoasub-region,andthenthroughtheplanningofmobilenodestooptimizethetravelpath,reducethemovingdistance,andreducesystemenergyconsumption.Inthelocationpositioningstage,thetargetnodelocationcanbecalculatedusingtheHILBERTpathplanningandtrilateration.Thesimulationresultsshowthattheproposedalgorithmcanimprovethepositioningaccuracywhentheenergyconsumptionisreduced.