Coordination of Radio Frequency Communications Amongst Radio Frequency Identification (RFID) Readers

摘要

Methods and apparatuses are described for reducing interference amongst frequency identification (RFID) readers operating within an interference range. Groups of frequencies from a range of frequencies are determined such that RFID readers transmitting on adjacent frequencies in a particular group of frequencies experience substantially negligible interference. A first group of frequencies is selected for a first time period of operation. RFID readers are each assigned a unique frequency from the first group of frequencies. At the end of the first time period, a second group of frequencies is selected and RFID readers are each assigned unique frequencies from the second group of frequencies. Substantially all frequencies of the groups of frequencies are assigned during a predetermined time duration.