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Interrogator used in RFID system

  • US 20070052524A1
  • Filed: 11/01/2006
  • Published: 03/08/2007
  • Est. Priority Date: 07/27/2004
  • Status: Active Grant
First Claim
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1. An interrogator used in an RFID system in which usage status information indicating the usage status of a channel for wireless communication with an RF tag are transferred between a plurality of interrogators, comprising:

  • a selection unit for selecting a channel from a plurality of channels in the RFID system;

    an interference level detection unit for detecting the interference level of the channel selected by said selection unit;

    a determination unit for determining whether the selected channel is usable or not on the basis of the usage status information of the selected channel notified from other interrogator and the interference level of the selected channel detected by said interference level detection unit;

    a communication unit for performing wireless communication with an RF tag using the selected channel when the selected channel is usable; and

    a channel change unit for causing said selection unit to select another channel when the selected channel is not usable.

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