Versatile Low Power Media Access for Wireless Sensor Networks Joseph Polastre Computer Science Department University of California, Berkeley Berkeley, CA 94720 email@example.com Jason Hill JLH Labs 35231 Camino Capistrano Capistrano Beach, CA 92624 firstname.lastname@example.org David Culler Computer Science Department University of California, Berkeley Berkeley, CA 94720 email@example.com ABSTRACT We propose B-MAC, a carrier sense media access protocol for wireless sensor networks that provides a exible interface to obtain ultra low power operation, effective collision avoidance, and high channel utilization. To achieve low power operation, B-MAC employs an adaptive preamble sampling scheme to reduce duty cycle and minimize idle listening. B-MAC supports on-the- y recon guration and provides bidirectional interfaces for system services to optimize performance, whether it be for throughput, latency, or power conservation. We build an analytical model of a class of sensor network applications. We use the model to show the effect of changing B-MAC s parameters and predict the behavior of sensor network applications. By comparing B-MAC to conventional 802.11inspired protocols, speci cally S-MAC, we develop an experimental characterization of B-MAC over a wide range of network conditions. We show that B-MAC s exibility results in better packet delivery rates, throughput, latency, and energy consumption
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