Tag anti-collision method, reader apparatus and system for rfid systems with multi-packet reception capability
AssigneeResearch & Business Foundation Sungkyunkwan University
InventorsTae Jin LEE, Yun Min KIM, Ji Hyoung AHN, Se Houn LEE
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Abstract
Provided is a method of preventing collision between a plurality of RFID tags by an RFID reader. An anti-collision method by a tag reader apparatus in an RFID system including a plurality of RFID tags, includes changing a length of a collision recovery slot in the collision recovery slot which successfully identifies a plurality of tags even though at least two tags simultaneously replied in one slot to cause collision so that data transmission of at least one identified tag is achieved.
Claims19
An anti-collision method by a tag reader apparatus in an RFID system including a plurality of RFID tags, the method comprising:
- changing a length of a collision recovery slot in the collision recovery slot which successfully identifies a plurality of tags even though at least two tags simultaneously replied in one slot to cause collision so that data transmission of at least one identified tag is achieved.
An RFID tag reader apparatus in an RFID system including a plurality of RFID tags, wherein the RFID tag reader apparatus changes a length of a collision recovery slot in the collision recovery slot which successfully identifies a plurality of tags even though at least two tags simultaneously replied in one slot to cause collision so that data transmission of at least one identified tag is achieved.
An RFID system comprising:
- an RFID reader apparatus configured to change a length of a collision recovery slot in the collision recovery slot which successfully identifies a plurality of tags even though at least two tags simultaneously replied in one slot to cause collision so that data transmission of at least one identified tag is achieved;
- and
- a plurality of RFID tags configured to transmit a unique identification number of a tag in response to a Query response command from the RFID reader, and to transmit data in response to an ACK command to the RFID reader.
Dependencies are inferred from the claim text.