Publications:An application dependent medium access protocol for active RFID using dynamic tuning of the back-off algorithm

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Title An application dependent medium access protocol for active RFID using dynamic tuning of the back-off algorithm
Author Björn Nilsson and Lars Bengtsson and Bertil Svensson
Year 2009
PublicationType Conference Paper
Journal
HostPublication Proceedings of the 2009 IEEE International Conference on RFID (RFID 2009)
DOI http://dx.doi.org/10.1109/RFID.2009.4911186
Conference The 2009 IEEE International Conference on RFID, April 27-28, 2009, Walt Disney World Swan & Dolphin, Orlando, Florida
Diva url http://hh.diva-portal.org/smash/record.jsf?searchId=1&pid=diva2:439112
Abstract Active Radio Frequency Identification (A-RFID) is a technology where the tags (transponders) carry an on-board energy source for powering the radio, processor circuits, and sensors. Besides offering longer working distance between RFID reader and tag than passive RFID, this also enables the tags to do sensor measurements, calculations and storage even when no RFID-reader is in the vicinity of the tags. In this paper we introduce a medium access data communication protocol which dynamically adjusts its back-off algorithm to best suit the actual active RFID application at hand. Based on a simulation study of the effect on tag energy cost, readout delay, and message throughput incurred by some typical back-off algorithms in a CSMA/CA (Carrier Sense Multiple Access / Collision Avoidance) A-RFID protocol, we conclude that, by dynamic tuning of the initial contention window size and back-off interval coefficient, tag energy consumption and read-out delay can be significantly lowered. We also present specific guidelines on how parameters should be selected under various application constraints (viz. maximum readout delay; and the number of tags passing).