基于移动AdHoc网络的OLSR路由改进协议

275Vol.27No.5200510JOURNALOFWUT(INFORMATION&MANAGEMENTENGINEERING)Oct.2005:1007-144X(2005)05-0116-04:2005-05-15.:(1977-),,,.:(03120).AdHocOLSR(,430070):OLSR,HELLOTC,:AdHoc;;OLSR;:TP393:A1AdHoc2070,,AdHocAdHoc,,,AdHoc1AdHoc1AdHoc,AdHoc,,,2,,,AdHoc,()2AdHoc2OLSROLSR[1]IETFMANET(MobileAdHocNetwork)[2],,,MPR(MultipointRelay)MPR(MPRSelector),MPR,MPROLSRMPR,MPROLSRHELLOTCHELLO1,,OLSRHELLO,HELLOMPR,HELLO,;HELLO,TC,TC275:AdHocOLSRTCMPR,TCHELLO22HELLO,ABHELLO,AB,BABHELLO,HELLOBA,BHELLO,BA,BAHELLO,HELLOAB,AHELLO,ABTC,,,,OLSR(TC),TC,(MPR)MPR,,MPR,,MPRTCOLSRMPR()MPR3,A,3MPR,TC,TCMPR(MPRSelector),TC,MPR,MPR,TCTC,,TC,MPRTC,,TC,TC,MPRselector,,[3]3MPR3OLSROLSR[4],,,,OLSR:(1)packetnum,2maxmin;(2)OLSR(HELLOTC),3:nor2malspeed,fasterspeedfastestspeed;(3)packetnum:packetnummin,,,normalspeed;(max+min)/2packetnummax,,fasterspeed;packetnummax,711200510,,,,fastestspeedOLSR,;OLSR,4OLSROPNETWindows2000PC,OPNETmodeler8.1100,OLSR,,:(1):22km2;:100;:350m;:1Mb/s(2),2,1015m/s,2m/s(3)MACIEEE802.11,CS2MA/CA;(4)5s,HELLOTC10bytes;5s,,5packets/s,13bytes,,UDP(5),:normalspeed:HELLOperiod=2s,TCperiod=5s;fasterspeed:HELLOperiod=1.5s,TCperiod=4s;fastestspeed:HELLOperiod=1s,TCpe2riod=3s;,:(1)(throughput)=4,4(2)(successrate)=/5,,,811275:AdHocOLSR,,[5]5self-adapting5OLSRHELLOTC,OLSR,,,AdHoc:[1]ClausenT,JacquetP.OptimizedLinkStateRoutingProtocol[EB/OL].[2]PerkinsC,Belding-RoyerE,AdHocOnDemandDistanceVector(AODV)Routing[EB/OL].[3]HuitemaC.RoutingintheInternet,[EB/OL].[4]CorsonS,MackerJ.RoutingProtocolPerformanceIs2suesandEvaluationConsiderations[EB/OL].[5]IEEE802.11standard,WirelessLANMediumAccessControl(MAC)andPhysicalLayer(PHY)specifica2tions[EB/OL].:AwirelessAdHocnetworkisacollectionofautonomousnodesorterminalsthatcommunicatewitheachotherbyformingamultihopradionetworkandmaintainingconnectivityinadecentralizedmanner.Opti2mizedLinkStateRouting(OLSR)isakindofproactiveroutingprotocolappliedinthemobileAdHocnet2work.Aneweffectiveoptimizationisproposed,whichcanadjustsendingfrequencyofHELLOmessagesandTCmessagesaccordingtolocalnetworktopology.Thesimulationresultsindicatethatnetworkthroughputsandsuccessratesofdatapacketsaredramaticallyincreased.Keywords:mobileAdHocnetwork;routingprotocol;OLSR;self-adaptingimprovementMengFangbing:Postgraduate;SchoolofInformationEngineering,WUT,Wuhan430070,China.[:]911