Anti-collision method and system using optimized binary...

Details Anti-collision method and system using optimized binary... Anti-collision method and system using optimized binary...

2005-12-27

2010-06-22

Wu, Daniel (Department: 2612)

Communications: electrical

Selective

Interrogation response

C710S117000, C710S120000, C370S347000

Reexamination Certificate

active

07741955

ABSTRACT:
Method for rapidly detecting identifier (ID) of tags, by radio frequency identification (RFID) reader in communication system that includes RFID reader and at least two tags communicating with RFID reader, is provided. RFID reader generates a prefix when IDs contained in at least two messages received collide with each other, prefix including a first colliding bit, which is set to ‘0’ or ‘1’, from high-order bits and non-colliding high-order bits. RFID reader sends a first message containing information that requests transmission of an assigned ID in a preset transmission period when the bits of the generated prefix match bits corresponding to the prefix, in the assigned ID. Tags receive a first message that contains a prefix including at least one bit, and sends a second message containing an assigned ID during a preset transmission period when the bits of the prefix match bits corresponding to the prefix, in assigned ID.

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