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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. Replica management is formulated as an energy optimization problem,...
Wireless reprogramming is a key functionality in wireless sensor networks (WSNs). In fact, the requirements for the network may change in time, or new parameters might have to be loaded to change the behavior of a given protocol. In large scale WSNs it makes economical as well as practical sense to upload the code with the needed functionalities without human intervention, i.e., by means of efficient...
Data generated in wireless sensor networks may not all be alike: some data may be more important than others and hence may have different delivery requirements. In this paper, we address differentiated data delivery in the presence of congestion in wireless sensor networks. We propose a class of algorithms that enforce differentiated routing based on the congested areas of a network and data priority...
The emergence of small, inexpensive, network-capable sensing devices led to a great deal of research on the design and implementation of sensor networks. A critical step in taking protocols from theory to actual deployment is comprehensive testing on physical sensor networks. Sensor network testbeds provide one way to facilitate such testing without requiring the deployment of a specialized sensor...
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