TAG IDENTIFICATION METHOD, TAG ANTICOLLISION METHOD, RFID TAG
First Claim
1. A tag identification method for generating a query tree according to a query and a response between an RFID reader and a tag to identify the tag, the tag identification method comprising:
- transmitting a query message from the RFID reader to the tag; and
receiving a response message for the query message from the tag,wherein the query tree is generated in the reverse order of a string owned by the tag.
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Accused Products
Abstract
Provided is a tag identification method in an RFID system. A tag identification method generates a query tree according to a query and a response between an RFID reader and a tag to identify the tag. In the method, a query message is transmitted from the RFID reader to the tag. A response message for the query message is received from the tag. Herein, the query tree is generated in the reverse order of a string owned by the tag. The query tree is generated in the reverse order of the tag IDs in the query tree-based protocol to reduce the frequency of collisions between the tags, thereby making it possible to reduce the time taken to identify all the tags within the recognizable range of the RFID reader.
16 Citations
9 Claims
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1. A tag identification method for generating a query tree according to a query and a response between an RFID reader and a tag to identify the tag, the tag identification method comprising:
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transmitting a query message from the RFID reader to the tag; and receiving a response message for the query message from the tag, wherein the query tree is generated in the reverse order of a string owned by the tag. - View Dependent Claims (2, 3, 4, 5)
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6. A tag anti-collision method comprising:
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receiving a first suffix from an RFID reader; transmitting a first response message after comparison of the first suffix with a tag ID in reverse order; receiving a second suffix longer than the first suffix after transmission of the first response message; and transmitting a second response message after comparison of the second suffix with the tag ID in reverse order. - View Dependent Claims (7)
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8. An RFID tag comprising:
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a demodulator unit demodulating a query message received from an RFID reader; a controller unit comparing a string contained in the query message with a tag ID in reverse order and generating a response message if the string is equal to the tag ID; and a modulator unit modulating the response message prior to transmission. - View Dependent Claims (9)
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Specification