ZigBeeAlliancePresenation.ppt

zigbee/ieee802.15.4zigbeealliance:http:/www.zigbieee802.15.4:/15/pub/tg4.html,2,shortlong,lowhigh,text,internet/audio,compressedvideo,multi-channeldigitalvideo,bluetooth1,bluetooth2,zigbee,802.11b,802.11a/hl2or10channelsinthe915mhzismbandand1channelintheeuropean868mhzband.,ieee802.15.4mac,upperlayers,ieee802.2llc,otherllc,ieee802.15.4,2400mhz,phy,ieee802.15.4,868/915mhz,phy,802.15.4architecture,22,ieee802.15.4phyoverviewoperatingfrequencybands,868mhz/915mhzphy,2.4ghz,868.3mhz,channel0,channels1-10,channels11-26,2.4835ghz,928mhz,902mhz,5mhz,2mhz,2.4ghzphy,23,ieee802.15.4phyoverviewpacketstructure,preamble,startofpacketdelimiter,phyheader,physervicedataunit(psdu),phypacketfieldspreamble(32bits)synchronizationstartofpacketdelimiter(8bits)phyheader(8bits)psdulengthpsdu(0to1016bits)datafield,6octets,0-127octets,24,ieee802.15.4phyoverviewmodulation/spreading,2.4ghzphy250kb/s(4bits/symbol,62.5kbaud)datamodulationis16-aryorthogonalmodulation16symbolsareorthogonalsetof32-chippncodeschipmodulationiso-qpskat2.0mchips/s868mhz/915mhzphysymbolrate868mhzband:20kb/s(1bit/symbol,20kbaud)915mhzband:40kb/s(1bit/symbol,40kbaud)datamodulationisbpskwithdifferentialencodingspreadingcodeisa15-chipm-sequencechipmodulationisbpskat868mhzband:300kchips/s915mhzband:600kchips/s,25,ieee802.15.4phyoverviewcommonparameters,transmitpowercapableofatleast.5mwtransmitcenterfrequencytolerance40ppmreceiversensitivity(packeterrorrate1%)65534)ofclientunits,lowlatencyavailableasrequiredabilitytoremainquiescentforlongperiodsoftimewithoutcommunicatingtothenetworkbluetoothmoderatedutycycle,secondarybatteryoperationwherebatterylastsaboutthesameasmasterunitwirereplacementforconsumerdevicesthatneedmoderatedatarateswithveryhighqosandverylow,guaranteedlatencyquasi-staticstarnetworkstructurewithupto7clients(andabilitytoparticipateinmorethanonenetworksimultaneously)generallyusedinapplicationswhereeitherpoweriscycled(headsets,cellphones)ormains-powered(printers,carkits)protocoldifferencescanleadtotremendousoptimizationsinpowerconsumption,71,peel-n-sticksecuritysensors,batteryoperation2aaalkalineor1li-aacell802.15.4/zigbeemodenon-beaconnetworkenvironmentsensorprocessrcoscillatorwakingupmcuanddoingnetworkcheck-inatsomeintervalmanysecuritysystemshavebetween10secondand15minuterequirementonasensorevent,deviceimmediatelyawakensandreportsintonetwork,802.15.4xcvr,mcu,irq,spi,spi,16.000mhz,vcc,vcc,4,3vdc,securitysensor,osc1,clk,72,securitysensortiming,battery-poweredsensor,mains-poweredrouter,intervaltimerexpires:wakeup,ccax2,rx,tx,acktxopt:pendingon,ackrx,txdata,rxdata,setintervaltimer,sleep,256s,650s,rxtx,192s,txrx,192s,350s,rxtx,650s,check-inonly1640s,eventandgetdata2300s,73,802.15.4securitysensor,onlyat15-minintervaldoesbtreachbatteryshelflife,anycheck-inintervalexceeding14secallowssensortosurpassalkalinebatteryshelflife,74,body-wornmedicalsensors,heartbeatsensorbattery-operatedusingcr2032li-coincell802.15.4/zigbeemodenetworkenvironmentusingguaranteedtimeslot(gts)networkbeaconsoccurringeitherevery960msor61.44s(closestvaluesto1and60s)sensorhastwoongoingprocessesheartbeattimeloggingtransmitheartrateandotherinformation(8bytestotal)instantaneousandaverageheartratebodytemperatureandbatteryvoltage,75,bluetooth30days(parkmode1.28s),802.15.4/zigbeemorebattery-effectiveatallbeaconintervalsgreaterthan0.246s,atbeaconinterval1s,15.4/zigbeebatterylife85days,atbeaconinterval60s,15.4/zigbeebatterylifeapprox416days,ieee802.15.4/zigbeevsbluetooth,76,summary,ieee802.15.4andzigbeedesignerconcentratesonendapplicationsiliconvendorsandzigbeealliancetakecareoftransceiver,rfchannelandprotocolreliableandrobustcommunicationsflexiblenetworkarchitecturesverylongprimarybatterylife(monthstoyearstodecades)veryinexpensivebillofmaterialslowsystemcomplexityfortheoemmoreinformationmotorola:,77,lowdataratewirelessevolution,78,wirelessnetworkingstandards,79,ieee802.15.4keyfeatures,highdatareliabilitydsss,bi-directional,messageacknowledgement,lowlatencybeaconmodeenablesguaranteedtimeslots(prioritycomm.)advancedpowermanagementtypicalmonitoringapplicationsgoodforshelflifeofbatteryinherentdatasecuritydataencryption,messageauthentication,packetfreshnessprotocolsimplicitydesignedforminimalcost&complexity,80,zigbeeoverview,specificationsmanagedbythezigbeeallianceglobalconsortiumofoems,icvendors&techcompaniesspecifydevice,networkandservicediscovery/pairingdefiningstar,mesh&cluster-treenetworksallowsuserstobalancesystemcost,reliability&batterylifedefiningsecuritymanagementextends32-,64-&128-bitaesencryptionof802.15.4definingapplicationprofiles&brandcomplianceensuresproduct&applicationinteroperability(e.g.,amr&dsm),81,dimensionamentodasligaesrdio,freespacelossl=32.4+20 xlogf(mhz)+20 xlogd(km)2.4ghz=l=1