信息通信：IntroductionofBluetoothTechnology(PPT,英文版)VIP

IntroductionofBluetoothTechnology,HistoryofWirelessCommunications,1896Marconiinventedwirelesstelegraphy1907Trans-Atlanticwi-serviceswasinitiated1915Wi-voicetransmissionbetweenNYandSanF.wasachieved1921PolicecarsinDetroit,Michiganwereequippedwithwirelessdispatchradios1946Firstpublictelephoneservicewasstartedin25UScities1968AT&TproposedthecellularconcepttoFCC1982EuropeanGlobalSystemsforMobile(GSM)Communicationswasestablished1991USDCwasreleased1994CDMAwasintroduced3Gwirelesssystemsarebeingdeployed,IsitaBird?.IsItaPlane?,Bluetoothisashortrangewirelessdigitalcommunicationtechnology.Itwasdevelopedasalowcost,lowpowerwayofremovingmanyofthedatawiresbetweendevices.ThisconceptiscalledaPANorPersonalAreaNetwork.ItisdesignedtooperateintheISMband,History,In1994,Ericssonstudyalow-powersystemforsubstitutecablesintheshort-rangeareaIn1998,Ericsson,Nokia,IBM,Intel,ToshibaformedtheSpecialInterestGroup(SIG)In2000,thefirstBluetoothheadsetappearedonthemarket.,WheredoweneedBluetooth?,Bluetoothfeaturesataglance,BluetoothProtocols,從協(xié)議來源分核心協(xié)議:SIG開發(fā)，包括BB，LMP，L2CAP，SDP電纜替代協(xié)議電路控制協(xié)議選用協(xié)議從體系結(jié)構(gòu)分底層硬件模塊:LM,BB,RF中間協(xié)議層高端應(yīng)用層,BluetoothDataTransmission,分組包格式接入碼用來定時(shí)同步、偏移補(bǔ)償、尋呼和查詢，有三種類型的接入碼：DAC（設(shè)備），IAC（查詢），CAC（信道）,BluetoothSpecifications,CoreSpecificationProfileSpecification,CoreSpecification,Explanation,RF-lowestlayer.characteristicofradio,F.Bands,channelarrangements,tran.powerlever,rec.sensitivitylevelBasebandcarriesoutPHY&MAC:devicediscovery,linkformation,synchronousandasynchronousLMPdefinecontrolmessagesthatconfigureandmanagebasebandconnection,Explanation,HostControllerInterface(HCI)defineastandardinterface-independentmethodofcommunicatingwiththeBluetoothchipLogicLinkControlandAdaptationProtocolcanbeviewedasalinklayerRFCOMMdefineamethodofemulatingtheRS-232cableconnectionontopofBluetoothairlink,ProfileSpecification,Explanation,BecauseinteroperabilityiscrucialtoBluetoothsoperation,SIGhasdefinedprofilespecificationstosupportit.Specifiescontrollerandstackparametersettingsaswellasfeaturesandproceduresrequiredforinterworking.TogettheBluetoothlogo,vendorsmustcomplywiththeprofiles.,NetworkTopology,AsetofBluetoothdevicessharingacommonchanneliscalledapiconet.,PiconetsandScatternets,Abridgenodecanbeasalveinbothpiconetsorbeaslaveinoneandamasterinanother.Forexample,cordlessheadsetandcellphoneamongseveralpeople,Specifications,ISM2.4Gband.InEUandUS,791MHz-widechannelsareallocated,only23channelsinFr.,Spain,Jp.ChannelsaccessedusingFHSS,signalrate1Mb/s,efficientrate721kb/sGFSKmodulationTransmissionchannelchanges1600/s,eq.625us-longslots,whichareidentifiedbysequencenumber(sn).Mastertransmitsintheevensn,slaveinodd,BluetoothDevicesConnection,LinkTypes,AsynchronousConnectionlessLink(ACLs)SynchronousConnection-Oriented(SCOs),SCOs,ProvideguaranteeddelayandbandwidthProvideconstant-bit-ratesymmetricchannelsLimitedreliability:noretransmission,notCRCalthoughoptionalprotectedwith1/3or2/3forwarderrorcorrection(FEC)convolutioncodeDatarate64kb/sinbothdirectionsSCOssuitforvoiceandmusic,ACLs,Appropriatefornon-real-time(diagram)trafficAslavecanexchangeonepacketatatimewiththemast