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Method of Preventing Collisions Between Rfid Readers in Rfid System

  • US 20090002129A1
  • Filed: 01/07/2007
  • Published: 01/01/2009
  • Est. Priority Date: 01/12/2006
  • Status: Active Grant
First Claim
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1. A method of preventing collisions between readers in a Radio Frequency Identification (RFID) system, comprising:

  • a first step of RFID readers selecting transmitting channels by examining channels;

    a second step of transmitting signals via the selected transmitting channels;

    a third step of receiving signals via channels having same frequencies as the selected transmitting channels;

    a fourth step of determining whether a collision has occurred by examining status of the signals that are received via the transmitting channels;

    a fifth step of, if, as a result of the determination at the fourth step, it is determined that a collision between the readers has occurred, repeating the first to fourth steps after delays of random time periods based on a predetermined equation; and

    a sixth step of, if, as a result of the fourth step, no collision between readers is detected, communicating with the corresponding RFID tags.

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