ID anti-collision method using data structure applied to RFID system
First Claim
1. An identification (ID) anti-collision method for a radio frequency identification (RFID) system including a reader having a data structure and a plurality of tags having IDs, the ID anti-collision method comprising:
- (a) transmitting an ID transmission request command from the reader to the tags using a request value;
(b) determining whether the IDs collide with one another based on a bit pattern transmitted from the tags;
(c) if the IDs of the tags collide with one another, computing a next request value for a next request based on the bit pattern to transmit a request command, and computing and storing a future request value; and
(d) if the IDs of the tags do not collide with one another, transmitting and receiving data and a tag using an ID of the tag corresponding to the bit pattern, and if the request value is stored, transmitting the request command using the future request value that was previously stored.
1 Assignment
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Accused Products
Abstract
An identification (ID) anti-collision method using a data structure to be applied to a radio frequency identification (RFID) system, includes transmitting an ID transmission request command from the reader to the tags using a predetermined request value; determining whether the IDs of the tags collide with one another, based on a bit pattern transmitted from the tags; if the IDs of the tags collide, computing a next request value to be used at a next request to transmit a request command, and if the IDs of the tags do not collide, computing and storing a future request value to be used; and if the IDs of the tags do not collide, transmitting and receiving data and a tag using an ID of the tag corresponding to the bit pattern and if the requested value is stored, transmitting a request command using the stored request value.
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Citations
16 Claims
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1. An identification (ID) anti-collision method for a radio frequency identification (RFID) system including a reader having a data structure and a plurality of tags having IDs, the ID anti-collision method comprising:
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(a) transmitting an ID transmission request command from the reader to the tags using a request value;
(b) determining whether the IDs collide with one another based on a bit pattern transmitted from the tags;
(c) if the IDs of the tags collide with one another, computing a next request value for a next request based on the bit pattern to transmit a request command, and computing and storing a future request value; and
(d) if the IDs of the tags do not collide with one another, transmitting and receiving data and a tag using an ID of the tag corresponding to the bit pattern, and if the request value is stored, transmitting the request command using the future request value that was previously stored. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A computer-readable medium for storing a program for identification (ID) anti-collision for a radio frequency identification (RFID) system including a reader having a data structure and a plurality of tags having IDs, the program comprising:
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(a) transmitting an ID transmission request command from the reader to the tags using a request value;
(b) determining whether the IDs collide with one another based on a bit pattern transmitted from the tags;
(c) if the IDs of the tags collide with one another, computing a next request value for a next request based on the bit pattern to transmit a request command, and computing and storing a future request value; and
(d) if the IDs of the tags do not collide with one another, transmitting and receiving data and a tag using an ID of the tag corresponding to the bit pattern, and if the request value is stored, transmitting the request command using the future request value that was previously stored. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16)
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Specification