BS ISO/IEC 18000-64:2012 - Page 2

Information technology. Radio frequency identification for item management. Parameters for air interface communications at 860 MHz to 960 MHz Type D | Status: Confirmed, Current

1 Scope ThispartofISO/IEC 18000definestheairinterfaceforradiofrequencyidentification (RFID) devicesoperatinginthe860 MHzto960 MHzIndustrial, Scientific, andMedical (ISM) bandusedinitemmanagementapplications. ItprovidesacommontechnicalspecificationforRFIDdevicesthatcanbeusedbyISOcommitteesdevelopingRFIDapplicationstandards. ThispartofISO/IEC 18000isintendedtoallowforcompatibilityandtoencourageinter-operabilityofproductsforthegrowingRFIDmarketintheinternationalmarketplace. Itdefinestheforwardandreturnlinkparametersfortechnicalattributesincluding, butnotlimitedto, operatingfrequency, operatingchannelaccuracy, occupiedchannelbandwidth, maximumeffectiveisotropicradiatedpower (EIRP), spuriousemissions, modulation, dutycycle, datacoding, bitrate, bitrateaccuracy, bittransmissionorder, and, whereappropriate, operatingchannels, frequencyhoprate, hopsequence, spreadingsequence, andchiprate. Itfurtherdefinesthecommunicationsprotocolusedintheairinterface. ThispartofISO/IEC 18000specifiesthephysicalandlogicalrequirementsforapassive-backscatter, TagOnlyTalksAfterListening (TOTAL) RFIDsystem. ThesystemcomprisesInterrogators, alsoknownasreaders, andtags, alsoknownaslabels. AnInterrogatorreceivesinformationfromatagbytransmittingacontinuous-wave (CW) RFsignaltothetag; thetagrespondsbymodulatingthereflectioncoefficientofitsantenna, therebybackscatteringaninformationsignaltotheInterrogator. ThesystemisTOTAL, meaningthatatagmodulatesitsantennareflectioncoefficientwithaninformationsignaluponenteringanInterrogator'sfieldafterfirstlisteningforInterrogatormodulationinordertodetermineifthesystemisITFornot. Indetail, thispartofISO/IEC 18000containsType D. Type DisTOTALbasedonPulsePositionEncodingorMillerM=2encodedsubcarrier. ThispartofISO/IEC 18000specifies

• — physicalinteractions (thesignallinglayerofthecommunicationlink) betweenInterrogatorsandtags,
• — Interrogatorandtagoperatingprocedures,
• — thecollision arbitrationschemeusedtoidentifyaspecifictaginamultiple-tagenvironment.