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2006
Springer

Sift: A MAC Protocol for Event-Driven Wireless Sensor Networks

11 years 3 months ago
Sift: A MAC Protocol for Event-Driven Wireless Sensor Networks
Nodes in sensor networks often encounter spatially-correlated contention, where multiple nodes in the same neighborhood all sense an event they need to transmit information about. Furthermore, in many sensor network applications, it is sufficient if a subset of the nodes that observe the same event report it. We show that traditional carrier-sense multiple access (CSMA) protocols like 802.11 do not handle the first constraint adequately, and do not take advantage of the second property, leading to degraded latency and throughput as the network scales in size. We present Sift, a medium access protocol for wireless sensor networks designed with the above observations in mind. Sift is a randomized CSMA protocol, but unlike previous protocols, does not use a time-varying contention window from which a node randomly picks a transmission slot. Rather, to reduce the latency for the delivery of event reports, Sift uses a fixed-size contention window and a carefully-chosen, non-uniform probabi...
Kyle Jamieson, Hari Balakrishnan, Y. C. Tay
Added 25 Dec 2009
Updated 25 Dec 2009
Type Conference
Year 2006
Where EWSN
Authors Kyle Jamieson, Hari Balakrishnan, Y. C. Tay
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