Abstract
The communication protocol used is a key issue in order to make the most of the advantages of active RFID technologies. In this paper we introduce a carrier sense medium access data communication protocol that dynamically adjusts its back-off algorithm to best suit the actual application at hand. Based on a simulation study of the effect on tag energy cost, read-out delay, and message throughput incurred by some typical back-off algorithms in a CSMA/CA (Carrier Sense Multiple Access/Collision Avoidance) active 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 show that it is possible to decrease the energy consumption per tag payload delivery with more than 10 times, resulting in a 50% increase in tag battery lifetime. We also discuss the advantage of being able to predict the number of tags present at the RFID-reader as well as ways of doing it.
Highlights
IntroductionThe mentioned developments have made it possible to expand the usage of Radio Frequency IDentification (RFID) and narrow the span between different flavors of RFID technologies
Based on a simulation study of the effect on tag energy cost, read-out delay, and message throughput incurred by some typical back-off algorithms in a CSMA/CA (Carrier Sense Multiple Access/Collision Avoidance) active Radio Frequency IDentification (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
The performance of each of the algorithms is analyzed by extracting data from simulations and calculating the tag energy consumption and the tag read out delay
Summary
The mentioned developments have made it possible to expand the usage of RFID and narrow the span between different flavors of RFID technologies. The RFID technique is used to remotely and wirelessly identify a device named transponder (or tag) by using an interrogator (or reader). The RFID technology can be divided into two main categories, passive RFID and active RFID. This work investigates the possibilities of defining an active RFID protocol that is paving the way for different applications without deteriorating the performance regarding tag lifetime and read-out delays. For this to be possible, the protocol must be adaptable to the specific application scenario at hand. In a previous paper [1] we have introduced such a protocol and demonstrated the possible gains in tag energy consumption and read-out delay
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