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Method for resolving signal collisions between multiple RFID transponders in a field

DC
  • US 5,986,570 A
  • Filed: 09/03/1997
  • Issued: 11/16/1999
  • Est. Priority Date: 09/03/1997
  • Status: Expired due to Term
First Claim
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1. A method for an interrogator reading one or more RFID transponders in a field comprising the steps of:

  • a. providing a carrier signal;

    b. detecting the presence of at least one transponder;

    c. receiving data from all active transponders in the field;

    d. determining whether the interrogator has received a valid data transmission; and

    e. upon determining an invalid data transmission, informing all active transponders in the field that there was an incomplete read, the informing including suppressing the carrier.

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