A METHOD AND READER TO CONDUCT A LABEL QUERY IN A RADIO FREQUENCY IDENTIFICATION SYSTEM

摘要

The present invention provides a method to conduct a label query in a radio frequency identification system (41). Wherein, a query process conducted by a reader (30) for a group of passive labels (40) comprises a first query (1) and a subsequent query (2). The link frequency (LF2) used by a reverse link from label (40) to reader (30) in the subsequent query (2) is smaller than that (LF1) used by the reverse link in the first query (1). With the method of the present invention, the reverse link performance of passive label radio frequency identification system is improved, and the success rate of reading is increased. The invention further provides a reader (30) to implement the method.