RFID reader and method for adjusting a frame length of an RFID system comprising an RFID reader

摘要

An RFID reader (100), comprising: a collision detector (102) configured to detect, for each interval of a plurality of intervals of a current frame (110), in which there was a collision of signals (114_1: 114_2) transmitted by at least two RFID tags (116_1: 116_2), a property of signal signal signal by at least two RFID tags (116_1 transmitted: 116_2); wherein the RFID reader (100) comprises: a decoder (104) configured to decode, for the interval in which the collision is detected, the signal of the signals (114_1: 114_2) by at least two RFID tags transmitted (116_1: 116_2) using the property detected signal, wherein a likelihood of recovery of a collision (ai) describing a probability that the decoder (104) can decode accurately the signal depends on a signal with respect to noise of the current frame (110); and a frame length adjuster (106) configured to set a frame length (L) of a subsequent frame (112) based on the probability of a collision recovery (.alpha..sub.i).