无线网络·10无线mesh网络

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1、WirelessMeshNetworksChallengesandOpportunitiesYiPingSchoolofInformationSecurityEngineering,ShanghaiJiaoTongUniversity©2005,20061OutlineOverviewofthetechnologyOpportunities(Research)ChallengesCurrentstateoftheartConclusion2WirelessroutersGatewaysPrinters,serversMobileclientsStationaryclientsIntra-mes

2、hwirelesslinksStationaryclientaccessMobileclientaccessInternetaccesslinksNodeTypesLinkTypesOverview3GatewaysMultipleinterfaces(wired&wireless)MobilityStationary(e.g.rooftop)–mostcommoncaseMobile(e.g.,airplane,busses/subway)Serveas(multi-hop)“accesspoints”tousernodesRelativelyfewareneeded,(canbeexpen

3、sive)GW4WirelessRoutersAtleastonewirelessinterface.MobilityStationary(e.g.rooftop)Mobile(e.g.,airplane,busses/subway).Providecoverage(actsasamini-cell-tower).Donotoriginate/terminatedataflowsManyneededforwideareas,hence,costcanbeanissue.5UsersTypicallyoneinterface.MobilityStationaryMobileConnectedto

4、themeshnetworkthroughwirelessrouters(ordirectlytogateways)Theonlysources/destinationsfordatatrafficflowsinthenetwork.6User–WirelessRouterLinksWiredBus(PCI,PCMCIA,USB)Ethernet,Firewire,etc.Wireless802.11xBluetoothProprietaryPoint-to-PointorPoint-to-MultipointIfproperlydesignedisnotabottleneck.Ifdiffe

5、rentfromrouter-to-routerlinkswe’llcallthemaccesslinks7RoutertoRouterLinksWireless802.11xProprietaryUsuallymultipointtomultipointSometimesacollectionofpointtopointOftenthebottleneckIfdifferentfromrouter-to-userlinkswe’llcallthembackbonelinks8GatewaytoInternetLinksWiredEthernet,TVCable,PowerLinesWirel

6、ess802.16ProprietaryPointtoPointorPoint-to-MultipointWe’llcallthembackhaullinksIfproperlydesigned,notthebottleneck9HowitWorksUser-InternetDataFlowsInmostapplicationsthemaindataflowsUser-UserDataFlowsInmostapplicationsasmallpercentageofdataflows10TaxonomyWirelessNetworkingMulti-hopInfrastructure-less

7、(ad-hoc)Infrastructure-based(Hybrid)Infrastructure-less(MANET)SingleHopCellularNetworksWirelessSensorNetworksWirelessMeshNetworksCar-to-carNetworks(VANETs)Infrastructure-based(hub&spoke)802.11802.16Bl