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Energy efficiency is one of the crucial design criteria for wireless sensor networks. Idle listening constitutes a major part of energy waste, and thus solutions such as duty cycling and the use of wake-up radios have been proposed to reduce idle listening and save energy. Compared to duty cycling, wake-up radios save more energy by reducing unnecessary wake-ups and collisions. In this paper, the authors investigate the feasibility and potential benefits of using passive RFID as a wake-up radio. They first introduce a physical implementation of sensor nodes with passive RFID wake-up radios and measure their energy cost and wake-up probability. Then, they compare the performance of the RFID wake-up sensor nodes with duty cycling in a Data MULE scenario through simulations with realistic application parameters.
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