基于802.11的无线mesh网络mac层关键技术的研究

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1、北京邮电人学博上学位论文ABSTRACTthebackboneof删；MeshC1ientsaccessWMNsbycormectingtoMeshRouters，t11eycanberoutersalsoinsomespecialscenarios．Ithasbeennoticedbyfomerresearchesthatthepe雨衄anceachieVeddoesnotsatis6edtherequirementOfuserswithexistentMAC，routingandtransportprotocols．SoitisVeWnecessa

2、Wtomodi矽theseprotocolstoenhancethet啪smissionperfomanceinWMNs．1)Routingprotoc01sdesignedforAdHoccan’tworkperfectlywith、7yMNsf．orthediffeI．enceintopology，nodetypeandtI．afhcpattems．ThispaperproposesanemcientandadaptiVecross一1ayerroutingschemecoinedPathCost-BasedRouting(PCBR)schemef

3、．ormulti-channel，multi-hopWirelessMeshNetworks(WMNs)．Inourscheme，pathsaI．eselectedbasedonthepathcostdeteminedbythethreeinlportantmetrics：end-to-enddelay，aVailablebandwidthandpathpacketlossrate．Theend-to—enddelayandaVailablebandwidthareredefinedbasedonthe802．11sMACprotocoltofitth

4、emulti-channel，multi-hopWMNs．MeshRouters(MRs)processmostroutediscoVe拶workinthemselvestoreducethenumberofretransmissionsinfloodingtheroutediscoVe叫packets．Theroutepreferslessend-to-enddelay，morebandwidthandlesspowerconsumptionbyadaptingthecoe艏cientofthethreemetrics．2)AnovelSchemeo

5、fCooperativeMACformulti-hopmulti-radioVI北京邮电大学博士学位论文WirelessMeshNetworl(s(WMNs)hasbeenexploitedtoimproVetheperf．onnanceoftheIEEE802．11sMACdraRprotoc01．Theproposedschemeallowstransmitter(cooperatiVesourcenode．)requestmultipleintemediatenodesforcooperatiVelytransmittingdatatorecei

6、Ver(cooperatiVetargetnode．)whenthedirecttransmissionleadtothI．oughputdegradation．TheseintemediatenodesworkasaVirmalNode(VN)．Ifthetransmissionbaseontwohopscooperationcannotsatisfiedthetransmissionrequest，thecooperatiVesourcenodecanrequesttoestablishthreehopsormorehopscooperatiVet

7、ransmission．Thus，aslowone-hoptransmissioncanbetransf0加edintoafaster似o-hopormorehopstransmissionandtheproposedschemeutilizesmultiplechannelsforparalleltransmission，therebydecreasingthetransmissiontimeandincreasingthethroughputsignificantly．3)WirelessMeshNetworks(WMNs)arethemostpo

8、tentialtechnologyfor1ast-milebroadbandIntemetac