Wei Ye, John Heidemann, Deborah Estrin
squeezeâ€"This paper proposes S-MAC, a medium-access control (MAC) protocol designed for receiving set sensing element networks. Wireless demodulator networks use battery-operated computing and spotting devices. A network of these devices will collaborate for a parking lot application such as environmental monitoring. We expect sensor networks to be deployed in an ad hoc fashion, with individual nodes remaining for the most part inactive for long periods of time, but then becoming dead active when something is detected. These characteristics of sensor networks and applications motivate a MAC that is varied from traditional wireless MACs such as IEEE 802.11 in almost every way: energy conservation and self-con?guration are indigenous goals, while per-node fairness and reaction time are less important. S-MAC uses 3 novel techniques to take down energy consumption and support self-con?guration. To reduce energy consumption in listening to an idle channel, nodes sporadically sleep. Neighboring nodes form virtual clusters to auto-synchronize on sleep schedules. excite by PAMAS, S-MAC also sets the radio to sleep during transmissions of other nodes. inappropriate PAMAS, it only uses in-channel signaling.
Finally, S-MAC applies message passing to reduce contention latency for sensor-network applications that require store-andforward processing as data move finished the network. We evaluate our implementation of S-MAC over a sample sensor node, the Mote, developed at University of California, Berkeley. The experiment results show that, on a source node, an 802.11-like MAC consumes 26 times much energy than S-MAC for traf?c load with messages sent every 110s.
I. I NTRODUCTION
W
IRELESS sensor networking is an emerging technology that has a tolerant range of potential applications including environment monitoring, smart spaces, medical systems and robotic exploration. much(prenominal) a network normally consists of a large number...If you postulate to get a full essay, order it on our website: Orderessay
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