Frequency Allocation Method between Reader and Tag at Mobile RFID environment, RFID Reader therefor and RFID Tag thereof

摘要

The present invention relates to a frequency allocation method between a reader and a tag in a mobile RFID environment and an RFID reader and a tag therefor.;According to the present invention, a method of allocating a frequency between a reader and a tag is a method of allocating a frequency in an RFID environment using a microwave (UHF) band including a plurality of channels, and a predetermined number of channel intervals among the plurality of channels. A reader frequency band allocation step of allocating a channel selected from the leader channel region including skip channels selected as a transmission signal frequency band of the reader; And a tag frequency band allocation step of allocating a channel selected from a tag channel region including channels other than the reader channel region among the plurality of channels as a transmission signal frequency band of a tag. The reader according to the present invention uses a Pulse Interval Encoding (PIE) encoding method and a Double-SideBand Amplitude-Shift Keying (DSB-ASK) modulation scheme. The tag uses a Miller subcarrier coding scheme and a double-sideband amplitude-shift keying (DSB-ASK) modulation scheme. In addition, the frequency occupancy method between the reader and the tag uses an LBT (Listen Before Talk) method.;The present invention provides a guard band between a transmitting frequency channel and a receiving frequency channel by setting a frequency band used by a reader at a predetermined channel interval and using a channel region constituting the interval as a frequency band of a backscattered signal of a tag. ), And the reader's transmit / receive separation can be increased. The present invention can prevent collisions between readers by using the LBT frequency occupancy method in a mobile RFID environment having a small number of tags and a large number of readers.;Mobile RFID, dense-interrogator environment, ISO / IEC 18000-6C, Pulse Interval Encoding (PIE), Frequency Modulation 0 (FM0), Miller Sub-carrier