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Int. J. Sensor Networks, Vol. 3, No. 1, 2008 43 Minimising the effect of WiFi interference in 802.15.4
 

Summary: Int. J. Sensor Networks, Vol. 3, No. 1, 2008 43
Minimising the effect of WiFi interference in 802.15.4
wireless sensor networks
Razvan Musaloiu-E. * and Andreas Terzis
Department of Computer Science,
Johns Hopkins University, Baltimore, Maryland, USA
E-mail: razvanm@cs.jhu.edu
E-mail: terzis@cs.jhu.edu
*Corresponding author
Abstract: Interference from colocated networks operating over the same frequency range,
becomes an increasingly severe problem as the number of networks overlapping geographically
increases. Our experiments show that such interference is indeed a major problem, causing
up to 58% packet loss to a multihop 802.15.4 sensor network competing for radio spectrum
with a WiFi network. We present interference estimators that can be efficiently implemented on
resource constrained motes using off-the-shelf radios and outline distributed algorithms that use
these estimators to dynamically switch frequencies as interference is detected. Lastly, we evaluate
the proposed algorithms in the context of a real-life application that downloads large amounts of
data over multihop network paths. Our results show that the proposed approach successfully detects
interference from competing WiFi channels and selects non-overlapping 802.15.4 channels. As a
result, the proposed solution reduces end-to-end loss rate from 22%58% to < 1%.

  

Source: Amir, Yair - Department of Computer Science, Johns Hopkins University

 

Collections: Computer Technologies and Information Sciences