ANTI-COLLISION METHOD FOR RFID READERS

摘要

An anti-collision method in an RFID(Radio Frequency IDentification) system is provided to shorten the time necessary for an RFID reader to identify a plurality of RFID tags by reducing the number of times of the transmission of unnecessary commands and the amount of data to be transmitted at the standard protocol of ISO 18000-6 type B. An RFID reader selects a set of RFID tags in its own read zone, changes states of the tags from a 'READY state' to an 'ID state'. The RFID reader generates random numbers of '0' and '1' using a FAIL command, used when a collision is detected, a SUCCESS command, used when there is no collision, and a FAIL_RNG command, used when there is no response from tags, and finds out one among the selected RFID tags. When a tag is selected as the count value of the tag is '0', the RFID reader shifts state of the RFID tag from the ID state to a DATA_EXCHANG state.