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Method for handling collision in an identification system

  • US 9,070,003 B2
  • Filed: 02/09/2012
  • Issued: 06/30/2015
  • Est. Priority Date: 04/04/2011
  • Status: Active Grant
First Claim
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1. A method for handling collision in an identification system the method comprising the following steps:

  • a reader device transmits an initialization command to a first transponder and to a second transponder;

    upon receiving the initialization command, the first transponder and the second transponder enter into a muted state, and in the muted state the first transponder and the second transponder do not respond to commands from the reader device;

    in a first start time slot randomly determined by the first transponder, the first transponder enters into an un-muted state from the muted state and the first transponder remains in the un-muted state until the reader device sends a mute command to the first transponder;

    in a second start time slot randomly determined by the second transponder, the second transponder enters into an un-muted state from the muted state and the second transponder remains in the un-muted state until the reader device sends a mute command to the second transponder;

    wherein, when the first start time slot and the second time slot occur at the same randomly determined time slot, then;

    when a transponder has a weaker signal modulation than another transponder, then the transponder with the weaker signal modulation re-enters into a muted state until a third start time slot randomly determined by the transponder corresponding to the weaker signal modulation; and

    when the signal modulation of the first transponder and the second transponder have substantially the same strength, then the first transponder and the second transponder re-enter into a muted state until a start time slot randomly determined by the corresponding transponder.

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