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Sensors 2011, 11(3), 2946-2960; doi:10.3390/s110302946

On the Optimal Identification of Tag Sets in Time-Constrained RFID Configurations

Department of Information Technologies and Communications, Technical University of Cartagena, Plaza del Hospital 1, 30202 Cartagena, Spain
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Received: 25 January 2011 / Revised: 1 March 2011 / Accepted: 2 March 2011 / Published: 4 March 2011
(This article belongs to the Section Physical Sensors)
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Abstract

In Radio Frequency Identification facilities the identification delay of a set of tags is mainly caused by the random access nature of the reading protocol, yielding a random identification time of the set of tags. In this paper, the cumulative distribution function of the identification time is evaluated using a discrete time Markov chain for single-set time-constrained passive RFID systems, namely those ones where a single group of tags is assumed to be in the reading area and only for a bounded time (sojourn time) before leaving. In these scenarios some tags in a set may leave the reader coverage area unidentified. The probability of this event is obtained from the cumulative distribution function of the identification time as a function of the sojourn time. This result provides a suitable criterion to minimize the probability of losing tags. Besides, an identification strategy based on splitting the set of tags in smaller subsets is also considered. Results demonstrate that there are optimal splitting configurations that reduce the overall identification time while keeping the same probability of losing tags. View Full-Text
Keywords: RFID; anti-collision protocols; time-constrained configuration; identification time; tag loss probability RFID; anti-collision protocols; time-constrained configuration; identification time; tag loss probability
This is an open access article distributed under the Creative Commons Attribution License (CC BY 3.0).

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MDPI and ACS Style

Vales-Alonso, J.; Bueno-Delgado, M.V.; Egea-López, E.; Alcaraz, J.J.; Pérez-Mañogil, J.M. On the Optimal Identification of Tag Sets in Time-Constrained RFID Configurations. Sensors 2011, 11, 2946-2960.

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