System and method for controlling range of successful interrogation by RFID interrogation device
First Claim
1. A system for reading an RFID tag in a defined region while reducing the possibility of reading other RFID tags outside the region, comprising:
- an RFID reader at a fixed location in or near the region, the RFID reader capable of adjusting at least one associated transmission parameter; and
a plurality of delineation RFID tags each having a known and unique identification placed at specified locations in the region;
wherein the at least one transmission parameter associated with the reader is set according to responses from the delineation RFID tags to interrogation signals from the RFID reader and a predetermined figure of merit.
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Abstract
The present invention is directed to control an range of successful interrogation by an RFID reader so that tags located in a specific physical area are likely to be successfully interrogated by the reader while the chance of the reader reading tags in other locations are minimized. In one embodiment of the present invention, a plurality of delineation RFID tags with known unique identifying numbers are placed in an areas of interest or wanted region, and the reader is characterized to determine an optimal setting for at least one transmission parameter based on responses from the delineation RFID tags and a predetermined figure of merit.
81 Citations
22 Claims
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1. A system for reading an RFID tag in a defined region while reducing the possibility of reading other RFID tags outside the region, comprising:
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an RFID reader at a fixed location in or near the region, the RFID reader capable of adjusting at least one associated transmission parameter; and
a plurality of delineation RFID tags each having a known and unique identification placed at specified locations in the region;
wherein the at least one transmission parameter associated with the reader is set according to responses from the delineation RFID tags to interrogation signals from the RFID reader and a predetermined figure of merit. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A method for controlling a range of successful interrogation by an RFID reader associated with at least one adjustable transmission parameter, comprising:
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placing a plurality of delineation RFID tags at specified locations in a wanted region;
for each of a plurality of trial parameter settings for the at least one transmission parameter, attempting to interrogate the plurality of delineation RFID tags using the RFID reader and recording responses from the delineation RFID tags;
determining an optimal transmission parameter setting for the reader based on a predetermined figure of merit calculated using the responses from the delineation RFID tags at each of the plurality of trial parameter settings and a pre-determined criteria; and
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setting at least one transmission parameter associated with the RFID reader according to the optimal transmission parameter setting. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20, 21, 22)
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Specification