Abstract - lic thesis Jonas Neander, Ide, Mälardalens högskola

Title: Using existing infrastructure as support for wireless sensor networks

Recent advancements in electronic design, such as low-power circuits, energy
efficient wireless communication, and improved energy supply, has enabled the
vision of wireless sensor networks to become a reality. Wireless sensor networks
typically consist of hundreds up to thousands of collaborating low-cost,
battery-driven and wireless sensor nodes with scarce resources. The wireless
sensor nodes are typical small physical entities, and usually small as a
matchbox but can in extreme cases be no larger than a cubic millimeter.

In this thesis we present an architecture called AROS that uses existing
infrastructure to aid in the management of wireless sensor networks. As an
example, the existing infrastructure could be situated in hospitals or
industrial buildings. The existing infrastructure can aid in prolonging the
lifetime of the wireless sensor network by having ``unlimited'' energy, long
range radio capacity, and high-speed computers. We enable prolonged lifetime by
centralizing some of the energy consuming administrative functionality of
wireless sensor networks.

We show, by simulations, that the AROS architecture is able to prolong the
lifetime of the sensor nodes. AROS is compared to a well known cluster based
architecture, LEACH. The comparisons show that AROS with static configuration
performs at least as well as LEACH in small wireless sensor networks in the size
100x100m, and up to 97 % better in long distance wireless sensor networks in the
size of 400x400m. We show that AROS still has got 88 % of its sensor nodes alive
when LEACHs' network demises.

In our simulations we have also studied how dynamic network clustering in AROS,
using a TDMA scheduler and non-mobile wireless sensor nodes, affects the amount
of data received by a base station. We show that AROS is better than LEACH-C in
collecting data to the base station with the same total amount of energy for
long distance networks and that AROS performs as well or better than LEACH-C in
small wireless sensor networks.



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Last modified on June 2006 by Anne Moe