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Synchronization of devices in a RFID communications environment

  • US 20100277286A1
  • Filed: 05/01/2009
  • Published: 11/04/2010
  • Est. Priority Date: 05/01/2009
  • Status: Active Grant
First Claim
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1. A method of operating a radio frequency identification (RFID) tag within a radio frequency identification (RFID) communication environment, comprising:

  • providing at least one RFID tag configured to receive periodic first band RF signal interrogator polling signals and configured to transmit second band RF signal response signals in response thereto, the first band being a multiple channel-based frequency band and the second band being a non-channel based frequency band; and

    repeatedly and alternately performing the following two steps;

    operating the RFID tag in a timed low power sleep mode for a predefined sleep time during which the RFID tag does not listen for transmitted first band RF signal interrogator polling signals, andthen waking the RFID tag to operate in a timed powered up listening mode for a predefined tag listening time during which the RFID tag actively listens for transmitted first band RF signal interrogator polling signals; and

    wherein the method further comprises dynamically adjusting the length of the predefined sleep time before again waking the RFID tag to the listening mode.

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