Q-NiGHT: Adding QoS to Data Centric Storage in Non-Uniform Sensor Networks
Authors: Michele Albano, Stefano Chessa, Francesco Nidito and Susanna Pelagatti
Comments: 21 pages, 9 figures, 1 table
Abstract:
Storage of sensed data in wireless sensor networks is essential when
the sink node is unavailable due to failure and/or disconnections, but
it can also provide efficient access to sensed data to multiple sink
nodes. Recent approaches to data storage rely on Geographic Hash
Tables for efficient data storage and retrieval. These approaches
however do not support different QoS levels for different classes of
data as the programmer has no control on the level of redundancy of
data (and thus on data dependability). Moreover, they result in a
great unbalance in the storage usage in each sensor, even when sensors
are uniformly distributed. This may cause serious data losses, waste
energy and shorten the overall lifetime of the sensornet. In this
paper, we propose a novel protocol, Q-NiGHT, which (1) provides a
direct control on the level of QoS in the data dependability, and (2)
uses a strategy similar to the rejection method to build a hash
function which scatters data approximately with the same distribution
as sensors. The benefits of Q-NiGHT are assessed through a detailed
simulation experiment, also discussed in the paper. Results show its
good performance on different sensors distributions on terms of both
protocol costs and load balance between sensors.
@TechReport{TR06QNiGHT, author = {Michele Albano and Stefano Chessa and Francesco Nidito and Susanna Pelagatti}, title = {Q-NiGHT: Adding QoS to Data Centric Storage in Non-Uniform Sensor Networks}, institution = {Dipartimento di Informatica, Universit\`a di Pisa}, number = {TR-06-16}, year = {2006} }