车路互联网的底层协议-802-11p标准

201111-802.11p802.11pStandardSpecificationforTelecommunicationsandInformationExchangeBetweenRoadsideandVehicleSystems,,,400065LuoZhi-feng,XuHong-gang,HeShan(ChongqingUniversityofPostsandTelecommunications,Chongqing400065-802.11p。802.11p802.11p(MAC)(PHY)、PP-DU802.11p。802.11p、、802.11pSimulink。802.11pSimulinkP393A1003-0107(2011)11-0045-06Abstract:DetaileddescriptiontheRoadsideandVehicleSystem'sunderlyingprotocol-802.11pstan-dard.Compared802.11pwiththetraditionalwirelessLANtechnology,analysisthemediaaccesscontrollayer(MAC)andphysicallayer(PHY)modifyingin802.11pstandard,pointoutwhichthe802.11pcanbeusedbetweenmovingvehiclesfromPhysicallayerparameters,PPDUframestructureandpriorityac-cess.Andthenanalyzesthefrequency,channel,transmittingpowerandthespectrummaskadoptedin802.11pstandard;Andalsoputsforwardthechallengesthatstandardisfacedwithinsimulationandes-tablishesasetofdynamicsimulationsystemtotestthestandardinsimulatedsituation.Keywords:ITS(IntelligentTransportSystem);WirelessLAN;802.11p;RoadsideandVehicleSystems;PHY;MAC(MediaAccessControl);SimulinkCLCnumber:P393Documentcode:AArticleID1003-0107(2011)11-0045-06-802.11p!!!!!!!!0。。[1]。802.11p。802.11p802.11a,、。802.11p[2-4]20107IEEE802.11p[5]。802.11p。IEEE802.11pASTME2213-03[6]802.11p。802.11p。1994CEN/TC278DSRC19975.8GHzDSRC。C2C-CCDSRCIEEE802.11p[7]。2006(VCSEG)。700MHz[8]。1802.11pIEEE1997802.11[9]。802.112.4GHz2Mbps。452011111999IEEE802.11a802.11a5GHzOFDM6～54Mb/s802.11a[10]。、802.11a。[11]。[12]。802.11p802.11aPHY(RMS)MAC(CCH)IP(SCH)[6]。1.1802.11pPHY1.1.1802.11p802.11a20MHz10MHz802.11a1[6]。1IEEE802.11aIEEE802.11p1IEEE802.11aIEEE802.11p1600ns(GI)。802.11p(RMS)。。1dB,OFDM8μsGI6.4μs1/6.4μs=156.25kHz802.11a802.11p802.11a。52484。。802.11p71/2(ConvolutionalEncoding)1/2(Puncturing)2/33/4。BPSK、QPSK、16QAM64QAM43～27Mb/s。2[13]。2、1.1.2802.11p(PPDU)1IEEE802.11p(PhysicalProtocolDataUnitPPDU)。2[5]。-802.11pIEEE802.11aIEEE802.11p/Mb·s-16912182436485434.56912182427BPSKQPSK16QAM64QAMBPSKQPSK16QAM64QAM1/21/31/41/21/31/45252OFDM4μs8μs800ns1600ns16μs32μs312.5kHz156.25kHz20MHz10MHzK=7K=7/Mb·s-1//OFDM/OFDM3BPSK1/2148244.5BPSK3/4148366QPSK1/2296489QPSK3/4296721216-QAM1/24192961816-QAM3/441921442464-QAM2/362881922764-QAM3/462882161PPDU2PPDU46201111。10t1～t10(OFDM1/4)2T1～T2(OFDM)32μs。、。SIGNALOFDM。SIGNALRateLength3。RateLengthMACPHY(PSDU)。802.11pSIGNAL3Mbit/sSIGNAL。SignalDataData16、PSDU、6。Signal。1.2802.11pMAC802.11p(MAC)802.11802.11p、[5]。1.2.1802.11pMAC802.11MACPHY。MACPHYMAC(MLME)PHY(PLME)。(SAP)。SAPSMEMLMESAPSMEPLMESAPMLMEPLMESAP。802.11pMACMIBdot11ocb。dot11ocb/802.11p。(1),MAC(2)(3)。802.11MIBdot11ocbMACPYH。1.2.2、,IP[14]。802.11pIEEE802.11eEDCA[15]。MSDUMACMAC(UP)(ACI)(AC)EDCA。ACACAC。。1.2.3[16]。CSMA/CDCSMA/CA。802.11pOFDMA-CSMA[17]。OFDMA-CSMACSMA。BSSNAV。802.11pMAC。2802.11p2.1IP(FCC)5.850～5.925GHz75MHz。75MHz71(CCH)6(SCH)10MHz。(EIRP)4[18]。-802.11p3Signal47201111。802.11p43[5]。3802.11p3A1mW(0dBm)D760mW(28.8dBm)CCH。2.2。5.850～5.925GHz445[6]。4802.11p33.1802.11p[19]。802.11p-240km/h802.11p。。V2V。[20]。V2V(VTD)。VTD[21]。4IEEE802.11p5.850~5.925GHz/mW/dBmA123B1023C10033D76044.8dBr±2.25MHz±2.5MHz±2.75MHz±5MHz±7.5MHzA0-10-20-28-40B0-16-20-28-40C0-26-32-40-50D0-35-45-55-655-802.11p482011116MATLAB/Simulink-802.11p3.2MATLAB/SimulinkMATLABSimulink。6MATLAB/Simulink802.11p[22]。4802.11p802.11p802.11pMAC、PPDU802.11p。802.11pMAT-LAB/Simulink。[1].[D].:,2007.[2]IEEEP802.11pTM/D1.1.DraftAmendmenttoSTAN-DARDFORInformationtechnology-Telecommunicationsandinformationexchangebetweensystems-LAN/MANSpecificRequirements-Part11:WirelessLANMediumAccessControl(MAC)andPhysicalLayer(PHY)specifi-cations:WirelessAccessinVehicularEnvironments.Jan-uary2005.[3]IEEEP802.11pTM/D3.0.DraftStandardforInformationTechnology-Telecommunicationsandinformationexcha-ngebetweensystems-Localandmetropolitanareanet-works-Specificrequirements-Part11:WirelessLANMed-iumAccessControl(MAC)andPhysicalLayer(PHY)spec-ificationsAmendment7:WirelessAccessinVehicularEnvironments.July2007.[4]IEEEP802.11pTM/D10.0.DraftStandardforInformationTechnology-Telecommunicationsandinformationex-changebetweensystems-Localandmetropolitanareanet-works-Specificrequirements-Part11:WirelessLANMedi-umAccessControl(MAC)andPhysicalLayer(PHY)specifi-cationsAmendment7:WirelessAccessinVehicularEnvi-ronments.January2010.[5]IEEEStandardforInformationtechnology-Telecommuni-cationsandinformationexchangebetweensystems-Localandmetropolitanareanetworks-Specificrequirements-Part11:WirelessLANMediumAccessControl(MAC)andPhysicalLayer(PHY)specificationsAmendment6:Wire-lessAccessinVehicularEnvironments.July2010.[6]E2213-03.StandardSpecificationforTelecommunica-49201111-802.11ptionsandInformationExchangeBetweenRoadsideandVehicleSystems-5GHzBandDedicatedShortRangeCommunications(DSRC)MediumAccessControl(MAC)andPhysicalLayer(PHY)Specifications.July2003.[7]ITSStandardsAdvisory,2003,DedicatedShortRangeCommunications(DSRC).[8]ExperimentalGuidelineforVehicleCommunicationsSys-temusing700MHz-Band;ITSFORUMRC-006;February2009.[9]Informationtechnology-Telecommunicationsandinfor-mationexchangebetweensystems-Localandmetropolitanareanetworks-