Abstract
Co-operative computations in a network of sensor nodes rely on an established, interference free and repetitive communication between adjacent sensors. This paper analyzes a simple randomized and distributed protocol to establish a periodic communication schedule S where each sensor broadcasts once to communicate to all of its neighbors during each period of S. The result obtained holds for any bounded degree network. The existence of such a randomized protocol for a basic interference model is not new but it fails for a generalized interference model considered in this paper. In addition, for a network with n sensor nodes, our protocol reduces the number of random bits and the number of transmissions per sensor from Θ(log2 n) to O(logn). These reductions conserve power which is a critical resource. Both protocols assume upper bound on the number of nodes n and the maximum number of neighbors \({\mathcal{B}}\). For a small multiplicative (i.e., a factor ω(1)) increase in the resources, our algorithm can operate without an upper bound on \({\mathcal{B}}\).
There is a major advantage in establishing a periodic schedule. Any traditional distributed protocol on regular (non-wireless) network can be applied in conjunction with a periodic schedule to derive an interference free protocol for a wireless network. The penalty is proportional to the length of the period of the periodic schedule.
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Supported in part by Craves Family Professorship, McBride Chair and a grant from NSF CCF-1151375. This material was based on first author’s work supported by the National Science Foundation, while working at the Foundation. Any opinion, finding, and conclusions or recommendations expressed in this material are those of the author and do not necessarily reflect the views of the National Science Foundation.
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Kalyanasundaram, B., Velauthapillai, M. A Near Optimal Periodic Transmission Schedule in Bounded Degree Wireless Sensor Network. Theory Comput Syst 51, 474–491 (2012). https://doi.org/10.1007/s00224-012-9404-5
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DOI: https://doi.org/10.1007/s00224-012-9404-5