蓝牙在智能家居中的应用

©2012Ciscoand/oritsaffiliates.Allrightsreserved.CiscoConfidential1©2012Ciscoand/oritsaffiliates.Allrightsreserved.CiscoConfidential12014-1-28BluetoothinSmartHomeJerryJianjunXu©2012Ciscoand/oritsaffiliates.Allrightsreserved.CiscoConfidential2• BluetoothOverview• UsecasesinConnectedLife• Architecture• Chipset• SoftwareProtocol• Qualification©2012Ciscoand/oritsaffiliates.Allrightsreserved.CiscoConfidential3©2012Ciscoand/oritsaffiliates.Allrightsreserved.CiscoConfidential4• Bluetoothisashort-rangeandlowpowerwirelesstechnologyoriginallydevelopedforexchangedataovershortdistancesfromfixedandmobiledevices,creatingpersonalareanetworks(PANs).• Bluetoothtechnologyoperatesintheunlicensedindustrial,scientificandmedical(ISM)bandat2.4to2.485GHz,usingspreadspectrum,frequencyhopping,full-duplexsignalatanominalrateof1600hops/sec.• CreatedbyEricssonon1994.ManagedbyBluetoothSpecialInterestGroup(SIG).• Therearefourmodeinconnectionstatus:Active,Sniff,Hold,andPark©2012Ciscoand/oritsaffiliates.Allrightsreserved.CiscoConfidential5Version2.1+EDR3.0+HS4.0Publishtime2007.72009.42010.6Rate1~3Mbps24MbpsNormal:3MbpsHS:24MbpsNewFeaturesSimpleSecurePairingSniffsubratingEncryptionPauseExtendedinquiryresponseLinksupervisiontimeoutQualityofserviceAlternateMAC/PHYEnhancedPowerControlUnicastConnectionlessDataGenericTestMethodologyLowcost,LowenergyReducethechannelto40FlexibletochoosesinglemodeorDualmodeFlexibletousehighspeedtechnologyTypicalusecaseSmallfiletransfer.Highspeed,bigsizefiletransferSports,fitness,healthcare,homeautomation©2012Ciscoand/oritsaffiliates.Allrightsreserved.CiscoConfidential6©2012Ciscoand/oritsaffiliates.Allrightsreserved.CiscoConfidential7• TwoormoreBluetoothdevicessharingthesamechannelwillformanetwork,calledPiconets.• Onedeviceactsasamasterandthedevicesconnectedtoitactasslaves• Slavecannotdirectlysendthedatatoeachother• Ineffect,themasteractsasaswitchforthepiconetandalltrafficmustpassthroughthemaster• Therecanbeupto7activeslaveinapiconetbutonlyonemaster.• Therecanbeupto255parkedslavesperpiconet©2012Ciscoand/oritsaffiliates.Allrightsreserved.CiscoConfidential8MasterActiveSlaveParkedSlaveStandby©2012Ciscoand/oritsaffiliates.Allrightsreserved.CiscoConfidential9CellphoneCordlessheadsetCordlessheadsetCellphoneCordlessheadsetCellphonemouseMasterActiveSlave©2012Ciscoand/oritsaffiliates.Allrightsreserved.CiscoConfidential10• Asetoftwomoreinterconnectedpiconetsformscatternets.• ABluetoothunitcanbeaslaveintwoormorepiconets,butitcanbeamasterinonlyone.• Devicesthatparticipateintwoormorepiconetsmayactas“gateway”• Bluetoothunitscanonlytransmitandreceivedatainonepiconetatatime.• Piconetsmaybeidentifiedbythemaster’sidentityandclock• Devicesgivenotificationofinactivetomasterbeforebecominginactiveinitspiconetforafinitelengthoftime.©2012Ciscoand/oritsaffiliates.Allrightsreserved.CiscoConfidential11MasterActiveSlaveParkedSlaveStandby©2012Ciscoand/oritsaffiliates.Allrightsreserved.CiscoConfidential12• Bluetoothdevicesarewireless• Bluetoothtechnologyisinexpensive• Bluetoothisautomatic• Sharevoiceanddata• Lowenergyconsumption• Accessiblefromanywhere• Lowdatarate• Shortrange• LowSecurity• Interferencewithotherdevices©2012Ciscoand/oritsaffiliates.Allrightsreserved.CiscoConfidential13©2012Ciscoand/oritsaffiliates.Allrightsreserved.CiscoConfidential14©2012Ciscoand/oritsaffiliates.Allrightsreserved.CiscoConfidential15©2012Ciscoand/oritsaffiliates.Allrightsreserved.CiscoConfidential16©2012Ciscoand/oritsaffiliates.Allrightsreserved.CiscoConfidential17©2012Ciscoand/oritsaffiliates.Allrightsreserved.CiscoConfidential18©2012Ciscoand/oritsaffiliates.Allrightsreserved.CiscoConfidential19©2012Ciscoand/oritsaffiliates.Allrightsreserved.CiscoConfidential20©2012Ciscoand/oritsaffiliates.Allrightsreserved.CiscoConfidential21©2012Ciscoand/oritsaffiliates.Allrightsreserved.CiscoConfidential22©2012Ciscoand/oritsaffiliates.Allrightsreserved.CiscoConfidential23©2012Ciscoand/oritsaffiliates.Allrightsreserved.CiscoConfidential24ApplicationFrameworkandSupportLinkManagerandL2CAPRadio&BasebandHostControllerInterfaceRFBasebandAudioLinkManagerL2CAPTCP/IPHIDRFCOMMApplicationsData©2012Ciscoand/oritsaffiliates.Allrightsreserved.CiscoConfidential25RadioProtocol• ResponsibleforthemodulationanddemodulationofdataintoRFsignals.• TheradiolayerdescribesthephysicalcharacteristicsaBluetoothdevice’sreceiver-transmittercomponentmusthave.BASEBANDPROTOCOL• Responsibleforchannelcodinganddecoding.• Digitizesthesignalsreceivedbytheradioforpassingupthestack.• FormatsthedataitreceivesfromtheLinkController(upperprotocol)fortransmissionoverthechannel.LinkController• ResponsibleforestablishingandmaintainingthelinksbetweenBluetoothunits.©2012Ciscoand/oritsaffiliates.Allrightsreserved.CiscoConfidential26TheLinkManagerProtocol(LMP)• Handleslinksetup,authentication,linkconfigurationandsecurityprocedures.• Establishesallconnectionswiththehelpofbasebandprotocol.HostControllerInterface• TheHostControllerInterface(HCI)definesuniformmethodsforaccessingandcontrollingthelowerlayersoftheprotocolstack(baseban