简介:ThispaperpresentsadaptivehybridprotocolsbasedonthedeclarativenetworkandmainlydiscussestheprincipleandrealizationoftheBayesian-estimationbasedadaptivehybridprotocolinthedeclarativenetwork,whichiswelladaptedtotheMobileAdhocNETwork(MANET).Theadaptivehybridprotocolisdesignedforadhocnetworkswhichhavecharacteristicslikeself-organizing,notrustedparty,flexibility,etc.Thenodesthatrunthehybridprotocolcanautomaticallyselectoneroutingprotocolthatissuitablefordifferentnetworkenvironment.TheBayesian-estimationbasedadaptivestrategy,thatimprovestheadaptabilityandstabilityoftheprotocol,succeedsintheRapidnet,adeclarativenetworkengine.TheresultintheRapidnetprovesthatthehybridprotocolandtheadaptivestrategyarefeasible.Theexperimentonthens-3simulator,anemergingdiscrete-eventnetworksimulator,validatesthatthisprotocolperformswellandreducescommunicationoverheads.
简介:Thispaperfocusesoninvestigatingimmunologicalprinciplesindesigningamulti-agentsecurityarchitectureforintrusiondetectionandresponseinmobileadhocnetworks.Inthisapproach,theimmunity-basedagentsmonitorthesituationinthenetwork.Theseagentscantakeappropriateactionsaccordingtotheunderlyingsecuritypolicies.Specifically,theiractivitiesarecoordinatedinahierarchicalfashionwhilesensing,communicating,decisionandgeneratingresponses.Suchanagentcanlearnandadapttoitsenvironmentdynamicallyandcandetectbothknownandunknownintrusions.Theproposedintrusiondetectionarchitectureisdesignedtobeflexible,extendible,andadaptablethatcanperformreal-timemonitoring.Thispaperprovidestheconceptualviewandageneralframeworkoftheproposedsystem.Intheend,thearchitectureisillustratedbyanexampletoshowitcanpreventtheattackefficiently.
简介:AdHoc网络是一种多跳的无线自组织网络,有着广阔的应用前景。但由于自身的复杂性,其应用和发展也面临着诸多问题。本文归纳和说明了AdHoc网络的各种应用,介绍了AdHoc网络相关产品的进展情况,分析探讨了AdHoc网络的发展趋势和有待解决的一些问题。
简介:Theabsenceofnetworkinfrastructureandopportunisticspectrumaccessincognitiveradioadhocnetworks(CRAHNs)resultsinconnectivityandstabilityproblems.Clusteringisknownasaneffectivetechniquetoovercomethisproblem.Clusteringimprovesnetworkperformancebyimplementingalogicalnetworkbackbone.Therefore,howtoefficientlyconstructthisbackboneamongCRAHNsisofinterest.Inthispaper,weproposeanewclusteringalgorithmforCRAHNs.Moreover,wemodelanovelclusterheadselectionfunctionbasedonthechannelheterogeneityintermoftransmissionranges.Tothebestofourknowledge,thisisthefirstattempttomodelthechannelheterogeneityintotheclusteringformationincognitiveradionetworks.Simulationresultsshowthattheperformanceofclusteringissignificantlyimprovedbythechannelheterogeneityconsiderations.
简介:AMinimizingIntermediateMulticastRoutingprotocol(MIMR)isproposedfordynamicmulti-hopadhocnetworks.InMIMR,multicastsessionsarecreatedandreleasedonlybysourcenodes.Ineachmulticastsessionprocess,thesourcenodekeepsalistofintermediatenodesanddestinations,whichisencapsulatedintothepacketheaderwhenthesourcenodesendsamulticastpacket.Nodesreceivingmulticastpacketsdecidetoacceptorforwardthepacketaccordingtothelist.Dependingontopologymatrixmaintainedbyunicastrouting,theshortestvirtualhierarchyroutingtreeiscon-structedbyimprovedDijkstraalgorithm.MIMRcanachievetheminimumnumberofintermediatenodes,whicharecomputedthroughthetree.Nocontrolpacketistransmittedintheprocessofmul-ticastsession.Loadofthenetworkislargelydecreased.ExperimentalresultshowsthatMIMRisflexibleandrobustfordynamicadhocnetworks.
简介:Inordertoestablisharoutesupportingmulti-constrainedqualityofservice(QoS),increasenetworkthroughputandreducenetworkenergyconsumption,animprovedantcolony-basedmulti-constrainedQoSenergy-savingroutingalgorithm(IAMQER)isproposed.Theantcolonyalgorithm,asoneoftheavailableheuristicalgorithms,isusedtofindtheoptimalroutefromsourcenodetodestinationnode.TheproposedIAMQERalgorithm,whichisbasedontheanalysisoflocalnodeinformationsuchasnodequeuelength,nodeforwardingnumberofdatapacketsandnoderesidualenergy,balancestherelationshipbetweenthenetworkthroughputandtheenergyconsumption,thusimprovingtheperformanceofnetworkinmulti-constrainedQoSrouting.SimulationresultsshowthatthisIAMQERalgorithmcanfindtheQoSroutethatreduceaverageenergyconsumptionandimprovesnetworkpacketdeliveryratioundertheend-to-enddelayandpacketlossratioconstraints.