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RFID readers system and methods for early hopping out of a frequency channel in the presence of RF interference

  • US 7,592,897 B2
  • Filed: 09/04/2007
  • Issued: 09/22/2009
  • Est. Priority Date: 04/25/2006
  • Status: Active Grant
First Claim
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1. A Radio Frequency Identification (RFID) reader system for communicating with RFID tags using a plurality of communication channels, comprising:

  • an antenna; and

    an operational processing block coupled to the antenna and operable to;

    cause a first wireless signal to be transmitted via the antenna to the RFID tags, the first wireless signal having a frequency carrier in a first one of the channels;

    determine whether or not objectionable interference has been detected based on a reply from at least one RFID tag communicating in the first channel and RF energy received in at least one of the channels available for communicating with the RFID tags; and

    cause a second signal to be transmitted to the RFID tags, the second signal having a frequency carrier in a second channel, andin which the second signal staffs to be transmitted at a first hopping time if no objectionable interference has been detected, and at a second hopping time earlier than the first hopping time if objectionable interference has been detected.

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