无线局域网技术走势(英文).ppt

September8,2003,TechnologyDirectionsfor802.11WLANUbiquitousWirelessBroadbandCraigBarratt,Ph.D.,Presidentcertifiedinternationaloperation;QualityofService,FirstdigitalCMOSOFDMradios-1999,First802.11achipsets-2001,FirstWi-Fiaudio/videoproducts-2001,FirstDSRCautomotiveapplications-2002,First802.11a/bchipsets-2002,Firstcertified802.11a/b/gandb/gchipsets-2003,Firstwirelessasfastaswired(SuperG)-2003,SomeofOurCustomers,ProliferationofWLANandOFDM,3rdGenOFDM802.11a802.11a/b802.11a/g/bdesigns,Theavailabilityoflowcost,robust,standards-basedWLANproductswillinfluencethehomeentertainment,publicaccess,andtelematicsmarketsenormously.,ConsumerElectronics,WLANHotSpots,VehicularApplications,WLANinConsumerElectronics,Portabledevices(Camera,Camcorder,MobileTablet,Laptop)BatterypoweredlowpowerconsumptionSmallsmallformfactorSingleroomrangefeasibleandsufficientFixeddevices(Settopbox,TV,DVD,MediaCenter)LinepoweredcanhavehigherpowerassumptionLargerlargerformfactorWholehouserangefeasibleanddesired,Satellite,Cable,DSLConnection,STB/HomeGateway,TVs,Stereos,PCs,Camcorder,WirelessLANHotSpots,HotSpotgrowthnowdriveninternationallybytelecomcarriersGreatestgrowthinJapanwithNTTaggressivelyrollingout802.11aand802.11bdualmodeaccesspointsandexpandingWLANto4.9GHz,Source:IDC,Corp.Reports,802.11TechnologyComparison,*Withany802.11bstationinthenetwork,CTS-onlymode.,ImportantIEEEWorkingGroups,802.11eQualityofServiceEDCFparameterizedQoSandHCFpolling-basedQoS802.11iSecurityRobustSecureNetwork:(1)AESEncryption,(2)EAPAuthentication802.11hDFS/TPCRadardetectionandavoidanceforEuropeanoperation802.11fInter-AccessPointProtocolCommunicationbetweenAPsforroamingandhandover802.11kRadioResourceManagementImprovedphysicallayermanagementandreporting802.11nHighThroughputWLANExtendingWLANdataratesbeyond108Mbps,TheAdventofMultimode802.11a/b/g,TheStandardsBattlesareOverUniversalconnectivityisthewatchwordofthedayComprehensiveprotocolsupportWorldwidetuningrange,2.32.5GHz,4.95.9GHzLine-speedAESandWPAencryptionforfast,secureconnectionsParadigm-shiftenhancementstorangeandthroughputCostreductioncurveunprecedentedinwirelesscommunications,EvolutionintheWi-FiMarket,802.11bhasbecomealegacymarketwithalmostallnewproductscomingtomarketwithmultimodeb/ganda/b/g,802.11b,TowardaSecureWirelessNetwork,IndustryConvergenceonAESEncryptionandEAPAuthenticationEncryptionstandardshaveprogressedfromWEP,toTKIP,andfinallytoAESAuthenticationprotocolshaveprogressedfrom802.1x,toEAP,tovendor-specificimplementationssuchasLEAPandPEAPWi-FiProtectedAccess(WPA)isthecurrentstate-of-the-art.WPAmandatesTKIPencryptionandEAPauthentication.WPA2upgradesencryptiontoAES.CloselymonitoringChinesestandardsGB15629.11andGB15629.1102forWAPIcompliance,ThroughputandRangeEnhancements,ExtendstheEfficiencyandReachofWirelessConnectionsLargeframes,compression,andpacketburstingdramaticallyimprovethroughput-100dBmReceiveSensitivityisclosetocellular,20dBbetterthanWi-FispecDeliversSeamlessInteroperabilityFullyinteroperablewithstandard802.11a,802.11b,and802.11gtraffic,Line-of-SightRange(meters),Standard11g,AtherosRangeExtended11a/g,790m,ForOffices:EliminatesDeadSpots,ForHomes:Single-APCoverage,ForPublicAccess:CoverLargerAreas,WhitherWLAN?,DataThroughput,90Mbps,1Mbps,100m,500m,Range(Indoor),WirelessLANandcellularhavetraditionallyhaddifferentapplicationsandusagemodels,Localareanetwork(500m),TheShapeofWLANConvergence,Voice,Data,LocalArea,WideArea,TechnologyComparison:802.11&3G,WLANMovesBeyond“Local”,TowardLong-Range,Metropolitan-AreaCoverage12kmpoint-to-pointlinks36MbpshavebeendemonstratedRequiresincreasedtransmitpower,antennadirectionalityProtocolmodificationsarealsopossible,PhotoscourtesyofMicroelectronicsTechnology,Inc.,WLANImplicationsforChina,Wi-FiIsaTrueTelecommunicationsTechnologyHereCandeliverubiquitousbroadbandcoverage,atcommodityprices,802.11,802.11,802.11,802.11or802.16,Industrial,Metropolitan,Residential,Summary,Wi-FiCombinestheBestofDatacomandTelecom802.11chipsetsimplementedinCMOSleverageMooresLawLargeamountsofunlicensedspectrumlowercostsfurtherWi-FiiswirelessEthernet(IP-based)L1,L2orientationfostersopennessa