Title: Multi-tag RFID systems

Authors: Leonid Bolotnyy, Gabriel Robins

Addresses: Department of Computer Science, University of Virginia, Charlottesville, 22904 Virginia, USA. ' Department of Computer Science, University of Virginia, Charlottesville, 22904 Virginia, USA

Abstract: Successful object identification is the primary objective of Radio Frequency Identification (RFID) technology. Yet, a recent major study by Wal-Mart has shown that object detection probability can be as low as 66%. We propose the tagging of objects with multiple tags to address the fundamental issue of object detectability. We show that this strategy dramatically improves the efficacy of RFID systems, even in the face of radio noise and other interfering factors. We define different types of multi-tag systems and examine their benefits using analytics, simulations, and experiments with commercial RFID equipment. We investigate the effect of multi-tags on anti-collision algorithms, and develop several techniques that enable multi-tags to enhance RFID security. We suggest new promising applications of multi-tags, ranging from improving patient safety to preventing illegal deforestation. We analyse the economics of multi-tag RFID systems and argue that the benefits of multi-tags will continue to increasingly outweigh their costs in many applications.

Keywords: RFID tags; radio frequency identification; reliability; multi-tags; tag detection; tag receptivity; collision avoidance; security; patient safety; illegal deforestation.

DOI: 10.1504/IJIPT.2007.016222

International Journal of Internet Protocol Technology, 2007 Vol.2 No.3/4, pp.218 - 231

Available online: 09 Dec 2007 *

Full-text access for editors Access for subscribers Purchase this article Comment on this article