Wimax宽带无线接入技术

TianJingUniversityChenmiao2011年3月14日WimaxforBroadbandWirelessAccess2Outline1.WhatisWiMAX2.802.16Introduction3.802.16dReferenceModel4.802.16dMACHighlights5.802.16dPHYHighlights6.802.16Networkarchitecture7.802.16Scenarios31.WhatisWiMAX?•WorldwideInteroperabilityforMicrowaveAccess(WiMAX)isthecommonnameassociatedtotheIEEE802.16standards.•ThesestandardsareissuedbytheIEEE802.16subgroupthatoriginallycoveredtheWirelessLocalLooptechnologieswithradiospectrumfrom10to66GHz.4ComparedwithWifi:higherthroughputQoSandenhancedsecurityservicesgoodscalabilityfortheentirenetwork5IEEE802.15xBluetoothWANMANLANPANETSIHiperPANIEEE802.11xWirelessLANETSIHiperLANIEEE802.16xWirelessMANETSIHiperMAN&HIPERACCESSIEEE802.20x(proposed)3GPP,EDGE(GSM)2.IEEE802.16x--Introduction6IEEE802.16IEEE802.16aIEEE802.16dIEEE802.16eStandardconditionsFrenquencyBandChannelConditionsFixed/MobileModulationTransmissionrateCellradiusDec.2001Jan.2003Oct.2004Feb.200610-66GHZ11GHZ10-66GHZ11GHZ6GHZLOSNLOSLOS+NLOSNLOSFixedFixedFixedMobileRoamingQPSK、16QAM&64QAM256OFDM(BPSK/QPSK/64AQM)256OFDM(BPSK/QPSK/16QAM/64QAM)2048OFDMA75Mbps(20MHZ)75Mbps(20MHZ)30Mbps(10MHZ)25/28MHZ1.25-20MHZ1.25-20MHZ1.25-20MHZ5km5-10km5-15km5-10km256OFDM(BPSK/QPSK/16QAM/64QAM)128/512/1024/2048OFDMABandWidth32-134Mbps(28MHZ)73.802.16dReferenceModel89MAClayerisconnection-oriented,mappingtothePSonthebusinessandassociatedwithdifferentlevelsofQoS.WhenanPSisinstalledintothesystem,itcanprovidethebusinessflow.WhenthePStoCompletetheregistration,theconnectionassociatedwiththetraffictoprovidetherequestedbandwidthguarantee.Whentheuserservicerequirementschange,maycreateanewconnection.4.802.16dMACHighlights10•Aconnectionnotonlydefinesthemappingwiththeconvergencelayer,butalsodefinethebusinessflow,businessflowdefinedinthePDUtransmittedonthisconnectiontheQoSparameters.ProvidesatrafficuplinkanddownlinkoftheQoSmanagementmechanism.114.1ServiceSpecificConvergenceSublayer(CS)•CSsub-layerismainlyresponsibleforthecompletionofexternalnetworkdatabetweenthedataandtheCPSsub-layermapping.Itallfromtheconvergencelayerserviceaccesspoint(CSSAP)receivedexternaldataintothenetworkandmappedtoMACSDU,andthroughtheMACServiceAccessPoint(MACSAP)senttotheCPSsub-layer.Inthisprocess,CSsub-layerontheexternalnetworkdataclassifythemwiththeappropriateMACserviceflowIDandtheconnectionidentifierCIDSFIDtheassociation,andalsoperformloadheadercompressionPHS.124.2MACCommonPartSublayer(CPS)•CPSsub-layerprovidesthecoreMAClayerfunctions,includingsystemaccess,bandwidthallocation,connectionestablishmentandmaintenanceetc.•CPSsub-layerthroughtheMACSAPCSfromdifferentsub-layerreceivesthedata,theformationofMACSDU.MACSDUcanbesplit,butalsowiththeotheroneormoreMACSDUintoanewMACPDU,accordingtoclassificationofMACconnectionstoensureQoS.134.3PrivacySublayer(PS)•MAClayercontainsaseparateoptionalsecuritysub-layertoprovideauthentication,keyexchangeandencryption.•802.16byencryptingtheconnectionbetweenthePSandBSprovideconfidentialaccesstothefixedbroadbandwirelessnetworkcapacity,inadditiontotherelevantBStrafficthroughencryptedagainstunauthorizedaccess,andgaveoperatorsapowerfulanti-theftfunctions.145.802.16dPHYHilightsPHYTYPEFrenquencybnadBasicFeaturesWirelessMAN-SC10-66GHz(permitted)Singlecarriermodulation,lineofsighttransmission,optionalchannelbandwidth20MHz,25MHzor28MHz,usingTDMAuplinkmode,duplexmodecanbeFDDandTDD.WirelessMAN-SCa11GHz(permitted)Singlecarriermodulation,non-sighttransmission,allowingthechannelbandwidthisnotlessthan1.25MHz,upstreamusesTDMAmode,theoptionalsupportforadaptiveantennasystems(AAS),ARQandspace-timecoding(STC)andsoon,duplexmodecanbeByFDDandTDD.WirelessMAN-OFDM11GHz(permitted)256sub-carrierOFDM(OrthogonalFrequencyDivisionMultiplexing)modulation,non-sighttransmission,optionalsupportforAAS,ARQ,thegridpattern(Mesh)andtheSTC,etc.,cantaketheformduplexFDDandTDD.WirelessMAN-OFDMA11GHz(permitted)By2048sub-carrierOFDMmodulation,non-sighttransmission,allowingthechannelbandwidthisnotlessthan1.0MHz,optionalsupportforAAS,ARQ,andSTC,etc.,canbeFDDandTDDduplexmode.WirelessHUMAN11GHz(FreeLicense)OFDMorOFDMAcanbeSCaormodulation,duplexmodeisTDD,mustsupportDynamicFrequencySelection(DFS),optionalsupportforAAS,ARQ,Mesh,andSTCandsoon.15•OFDMphysicallayersupportforframe-basedtransmission.Onecontainsadownlinksubframeandanuplinksub-frame.•OFDMphysicallayersupportforframe-basedtransmission.Onecontainsadownlinksubframeandanuplinksub-frame.•Uplinksub-framefromtheinitialrangingandbandwidthrequestforthecompetitiveslot,andoneormoreoftheSSemissionbydifferentupstreamphysicallayerPDUcomposition.16•802.16dOFDMphysicallayerusing256subcarriers,OFDMAphysicallayer2048subcarriers,thesignalbandwidthisvariablefrom1.25~20MHz.•Intermsofmultipleaccessmethods,802.16dintheuplinkusingTDMA(TimeDivisionMultipleAccess),downbyTDM(TimeDivisionMultiplexing)tosupportmulti-usertransmission.AnotherwaymultipleaccessOFDMA,the2048sub-carrierasanexample,thesystemwillalltheavailablesubcarriersaredividedinto32subchannels,eachsubchannelcontainsseveralsub-carriers.Multi-usermultipleaccessandfrequencyho