Using Failure Models for Controlling Data Avaialability in Wireless Sensor Networks

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Executive Summary

This paper presents Pirrus, a replica management system that addresses the problem of providing data availability on a wireless sensor network. Pirrus uses probabilistic failure models (e.g., derived from environmental conditions and estimation of available energy) to adaptively create and maintain a number of replicas of the data. The replica management is formulated as an energy optimization problem, and then solved with a greedy heuristic that uses only information gathered from neighbors. Intuitively, Pirrus trades off the energy saved by limiting the number of replicas when the network health is good to extend the lifetime when more replicas are needed.

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