GSM原理介绍(英文版)(ppt 34页).PPT

1、Agenda,.GSM900/DCS1800.TheGSMNetwork&AirInterface.TechnicalBasics.SpeechCoding.TypesofChannel.MakingaPhoneCall,GlobalSystemforMobile,(GroupeSpecialMobile),GSM,1982GroupeSpecialMobile?iscreatedwithinCEPT1986APermanentNucleusissetup1987Mainradiotransmissiontechniquesarechosen,basedonprototypeevalution

2、(1986)1989GSMbecomesanETSItechnicalcommitte1990Thephase1GSM900specificationsarefinalized1991Firstsystemsarerunning1992AllmajorEuropeanGSM900operatorsbegincommercialoperator,GSMDevelopmentHistory,SpeechServicesDataServicesShortMessageServices(SMS)SupplementaryServicesSubscriberIdentityModule(SIM)Secu

3、rityFunction,GSM/DCS1800Functionalities,RFAspects,TDMA0.3GMSKModulationBurstPowerTransmissionNeighbourCellsMeasurementHoppingUplink/DownlinkDTxBER&ReceiverTesting,GSM900/DCS1800/PCS1900,GSMFrequencyRange,890-915MHzUplink/MSTransmit935-960MHzDownlink/BSTransmitDuplexOffset45MHzChannelSpacing200kHzCha

4、nnelnumbering1-124TransmissionSpeed270Kbits,DCS1800FrequencyRange,1710-1785MHzUplink/MSTransmit1805-1880MHzDownlink/BSTransmitDuplexOffset95MHzChannelSpacing200kHzChannelnumbering512-885TransmissionSpeed270Kbits,GSMPrimaryBand,890,900,910,920,930,940,950,960,Freq,45MHz,Uplink(MobiletoBase),Downlink(

5、BasetoMobile),DCS1800PrimaryBand,1710,1735,1760,1785,1800,1825,1850,1875,Freq,95MHz,Uplink(MobiletoBase),Downlink(BasetoMobile),CarriersattheborderoftheGSMband,890.2,890.4,890.6,890.8,Freq,GSMband,200kHz,CarriersattheborderoftheDCS1800band,1710.2,1710.4,1710.6,1710.8,Freq,DCS1800band,200kHz,GSMNetwo

6、rks,BSC,BTS,BTS,BTS,BSS,BSC,BTS,BTS,BTS,BSS,MSC,MSC,OMC,OMC,ADC,NMC,VLR,VLR,HLR,AUC,EIR,Interfacetoothernetwork,MS,GSMNetworks,Terminology:MS-MobileStation(移动台)BSS-BaseStationSystem(基站系统)BTS-BaseTransceiverStation(基站收发台)BSC-BaseStationController(基站控制器)MSC-MobileSwitchingCentre(移动业务交换中心)OMC-Operation

7、sandMaintenanceCentre(操作与维护中心)NMC-NetworkManagementCentre(网络管理中心)AUC-AuthenticationCentre(鉴权中心)HLR-HomeLocationRegister(归属位置寄存器)VLR-VisitorsLocationRegister(来访位置寄存器)EIR-EquipmentIdentityRegister(设备标识寄存器),MSC,BSC,BSC,BSC,PSTN,BTS,BTS,BTS,AirInterface,AbisInterface,SS#7,SS#7,GSMInterface,MS,GMSKModula

8、tion,1,1,0,0,1,0,1,1,0,0,1,0,PSK,GuassianFilter,Spectrum200kHz,Modulation,4,0,1,2,3,4,5,6,7,1,2,3,4,5,6,Frequency,Amplitude,ARFCN,Timeslot,PhysicalChannelisanARFCNandTimeslot,TDMAandFDMA,TDMAandFDMA,Terminology:FDMA-FrequencyDivisionMultipleAccessTDMA-TimeDivisionMultipleAccessARFCN-AbsoluteRFChanne

9、lNumberTS-TimeslotPhysical-TheCombinationofaTSnumberChannelsandARFCN.Logical-AreMappedonPhysicalChannelsChannels,10us,10us,10us,10us,8us,8us,3,3,1,1,57,57,26,148ActiveBits,546.42us,147UsefulBits,542.8us,-70dB,-30dB,-6dB,+4dB,-6dB,-30dB,-70dB,Tol-1.0dB,Tol+1.0dB,GSMTDMAPowerBurst,PowerTimeTemplate,54

10、2.8us/147Bits,10,8,10,10,8,10,Time,Power,-70,0,dB,UpperLimit,LowerLimit,Actual,us,NormalBurst,PowerTimeTemplate,321.23us/87Bits,10,8,10,10,8,10,Time,Power,-70,0,dB,UpperLimit,LowerLimit,Actual,us,AccessBurst,87bits,Uplink&Downlink,Downlink/MSReceive,5,6,7,0,1,2,3,4,5,6,7,0,1,3,4,2,0,6,7,0,1,2,3,4,5,

11、6,7,1,3,4,2,Uplink/MSTransmit,5,Uplink&Downlink,ARFCN,0,2,4,7,3,6,0,1,3,5,0,6,1,4,7,2,5,3,1,2,6,4,5,7,2,4,6,0,3,5,7,1,3,2,1,0,4,5,6,7,0,1,2,3,4,5,6,7,0,0,3,4,5,6,7,0,1,2,3,4,5,1,ARFCN,UPLINK,DOWNLINK,45MHz,.UplinkLagsDownlinkby3Timeslotperiods.UplinkandDownlinkusesameTimeslotNumber.UplinkandDownlink

12、usesameChannelNumber(ARFCN).UplinkandDownlinkusedifferentbands(45MHzapartforGSM900),FrequencyHopping,20msBlocks,SpeechCoder,BitsOrdered,260Bits,260Bits,50,132,78,.RELPandLTPCoderRELP-Residual-ExcitedLinearPredictionCoderLTP-LongTermPrediction.ConvertsSpeechtoLowDataRate.20msSpeechmakes260Bits.Output

13、13kbit/s,VeryImportantBits,ImportantBits,OtherBits,SpeechCoder,ErrorCorrection,TypeIa50,TypeIb132,TypeII78,50,132,78,3,TypeIa,CRC,TypeIb,TypeII,BlockCode,25,66,25,66,3,4,78,Re-ordering,378,78,Halfrateconvolutionalcode,456Bitsfrom20msofSpeech,TypeIa,TypeIb,TypeIb,TypeIa,Tail,TypeII,CRC,262Bits,In,456

14、Bits,Out,DiagonalInterleaving,456Bitsfrom20msofSpeech,456Bitsfrom20msofSpeech,57,57,57,57,57,57,57,57,57,57,57,57,57,57,57,57,57,57,57,57,57,57,57,57,57,57,57,57,57,57,TCH,TrafficChannel(TCH)BurstsCarryTwo57BitsBlocks(114)Each120msofSpeech=456x6=2736bits2736/114=24burstsI.e.24frames(mobiletransmitso

15、nceperframe)Multiframehas26framesin120msThereare2spareframes厖OneSACCH,oneIdle,中国最大的资料库下载,SpeechtoRadio/RadiotoSpeech,Channelcoding,Speech,DigitizingandSourcecoding,Interleaving,Burstformatting,Ciphering,Modulation,Channeldecoding,Speech,Sourcedecoding,De-interleaving,Burstformatting,Deciphering,Demo

16、dulation,MSCamponFlowChart,MSTurnOn,MSsearcheschannelsandordersbysignalstrength,FCCHonBCCHandadjuststimebase,SCHonBCCHandfinetunestimebase&timing,DecodeBCCH&storeinfo,MSNextStongestBCCH,YES,NO,YES,NO,NO,Location=PreviousLocation?,YES,YES,MScampedon-listensforpage,canrequestservice,UsingSACCH-adjustp

17、ower,TA&reportRXQualetc,MSsendsRACH,BSassignsSDCCHtoMSusingtheCCCH,OrignatedCall,MSsendsRACH,BSORIGINATEDCALL,MSORIGINATEDCALL,MStransmitsandreceivesspeechonTCH,TCH,UsingtheSDCCH,authentication,callsetup,andTCHassignment,UsingtheSACCH,BScommandsMStoadustpower+timing,MSreportspower+RxqualityofBCCH+ad

18、jacentBCCH,MStransmits+receivesspeechonTCH,UsingtheSACCHonTCH,MSreportspower+Rxquality,BScommandsMStoadjustpower,TA,CalldisconnectedbyMSorBS,SubscriberIdentityModule(SIM),SIMcontains(atleast)followinginformation:IMSI(InternationalMobileSubscriberIdentification)MCC&MNC(MobileCountryCodeandmobileNetworkCode)Anyotheruserspecificinformation,InternationalMobileSubscriberIdentity(IMSI),IMSI,=,MCC,+,MNC,+,MSIN,NMSI,3digits,2digits,Notmorethan15digits,IMSI=InternationalMobileSubscriberIdentityMCC=MobileCountryCodeMNC=MobileN