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1、ZHULAYOUT4/20/113:06PMPage214ACCEPTEDFROMOPENCALLACriticalSurveyandAnalysisofRFIDAnti-CollisionMechanismsLeiZhuandTak-ShingPeterYum,TheChineseUniversityofHongKongABSTRACTwithothertags.Astheycanonlybepolledbythereader,theirrepliedpacketswillcollideandThean
2、ti-collisionmechanismisanimportantbelostifmultipletagsarepolled[1].partofRFIDsystems.ManyalgorithmswereOvertheyears,manyRFIDcommunicationproposedintheliterature,butmostofthemsystemshavebeenproposedintheliterature.weredesignedbasedonthetheoryofRandomWesumm
3、arizetheircommonoperationsasfol-Access(RA)systems.Inthisarticle,wereviewlows:thevarioustypesofanti-collisionsystemsand•TheRFIDReaderbroadcastsaninquiringtheircorrespondingalgorithms.Differentread-commandtoinitiatethecommunication.ingstrategiesarecriticall
4、yanalyzedandcom-•UponhearingtheReader’scommand,tagsparedbycomputersimulation.BycomparingtheinthevicinityrunafunctiontodecidedifferentworkingmechanismsofRAandRFIDwhethertoreplyornot.Thefunctioncansystems,weshowthatanewtheoryisneededforbedeterministic(compa
5、retheprefixofitsthedesignandanalysisofRFIDanti-collisionIDwiththestringbroadcastbythereaderalgorithm.andreplyiftheymatch)orprobabilistic(generatearandomnumberfrom0toLINTRODUCTIONandreplyifthenumberis0).•ThereadercontinuestobroadcastinquiringDuringthepastd
6、ecade,thepriceofpassivecommandsuntilitissurethatalltagsareRFIDtagshasdroppedlowenoughtoreplaceidentified.thebarcodetagsformanyapplications.RetailThecommandsetsofthereaderandthegiantsincludingWal-MartintheU.S.,Marks&replyfunctionsofthetagareusuallydifferen
7、tinSpenserintheUK,MetroinGermany,andMit-differentRFIDsystems.ThereadingefficiencysukoshiinJapan,haveallimplementedtheirisusuallynotthemajorconcern;instead,theRFIDsolutionsformoreefficientsupplychainsystemrobustnessandsystemcomplexityaremanagement.Inthefor
8、eseeablefuture,RFIDmoreimportantconsiderations.Thatiswhythetagswillbecheapenoughtorealizeitem-levelsystemsdefinedinstandards[2,3]areusuallytagging,thusenablinganewwaveofinnovativenotthemostefficientones.Traditionall
