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Bluetooth與ZigBee的比較分析

AttheWirelessCommunicationsAlliance”srecentmeetinginSiliconValley,BhupenderVirk,presidentandCEOofWPANcomponentsmakerCompXs,sortedouttheapplicationandtechnicaldifferencesbetweenBluetooth(IEEE802.15.1)andtheZigBeespecification(basedonIEEE802.15.4),whichwasratifiedinDecember.

ZigBeeprotocolsdefineatypeofsensornetworkforresidentialandcommercialapplicationssuchasheating,airconditioningandlightingcontrol.ItcombinesIEEE802.15.4,whichdefinesthephysicalandMACprotocollayers,withnetwork,securityandapplicationsoftwarelayersasspecifiedbytheZigBeeAlliance,aconsortiumoftechnologycompanies.

Imaginethefreedomiflightswitchesweretobecomewireless,eliminatingtheelectricalcablingthroughyourwalls,forexample.

Bluetooth,asyoulikelyknow,eliminatescablingbetweenelectronicproductsandaccessories,suchasbetweencomputersandprintersorbetweenphonesandheadsets.Bluetoothuserswithhandheldsorlaptopscanexchangefiles,businesscardsandcalendarappointments.Bluetoothismoreorientedtowardusermobilityandeliminatingshort-distancecabling;ZigBeeaimsmoreforgrand-scaleautomationandremotecontrol.

ThefirstZigBeeproductsarenowininteroperabilitytestingthroughApril,saysVirk,whoexpectsalliance-certifiedproductstobeavailableinthethirdquarter(whenhesaysCompXswillshipaZigBeeprotocolanalyzer).Industryreportsimplythat,eventually,ZigBeemightbebuiltintomobilephonesviadual-functionZigBee-Bluetoothchipsforremotecontrolofnearlyanythingyoucanthinkofandforbuyingitemsfromvendingmachines.

Finally,forthegeeksamongus,Virkpointedoutsometechnicaldifferencesbetweenthetwoprotocols:

●Modulationtechnique

Bluetooth:FrequencyHoppingSpreadSpectrum(FHSS)

ZigBee:DirectSequenceSpreadSpectrum(DSSS)

●Protocolstacksize

Bluetooth:250Kbytes

ZigBee:28Kbytes

●Battery

Bluetooth:Intendedforfrequentrecharging

ZigBee:Notrechargeable(onereasonbatterieswilllastforupto10years)

●Maximumnetworkspeed:

Bluetooth:1Mbit/sec

ZigBee:?250Kbit/sec

●Networkrange:

Bluetooth:1or100meters,dependingonradiocla

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