vaida-abstract
Abstract - lic thesis Jonas Neander, Ide, Mälardalens
högskola
Title: Using existing infrastructure as support for wireless sensor
networks
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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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