Patent ID: 7982584

Claim:
A radio frequency identification (RFID) reader mountable to a wireless communication terminal, comprising: a reader controller for beginning a reader operation to communicate with a tag in response to a command of a terminal controller of the wireless communication terminal; an anti-collision state machine for controlling collision among a plurality of tags, and transferring the result of communication with the tag to the reader controller; a reader transmitter for generating a reader command message decided at the anti-collision state machine, and coding and modulating the generated reader command message; a reader receiver for demodulating and decoding a tag signal received from tag, and reporting a tag response state to the anti-collision state machine; and a channel controller for selecting a channel to use to communicate with a tag in response to a command of the reader controller, wherein the RFID reader is sized and shaped to be mounted to a wireless communication terminal, wherein the reader controller selects one of a Listen Before Talk (LBT) frequency occupying method and a Frequency Hopping Spread Spectrum (FHSS) frequency occupying method to communicate with the tag, wherein the reader controller switches from the LBT frequency occupying method to the FHSS frequency occupying method, if tag data is not successfully obtained for a predetermined time when the LBT frequency occupying method is used.