Title:
Hierarchical Power Management in Disruption Tolerant Networks with Traffic-Aware Optimization
Hierarchical Power Management in Disruption Tolerant Networks with Traffic-Aware Optimization
Author(s)
Jun, Hyewon
Ammar, Mostafa H.
Corner, Mark D.
Zegura, Ellen W.
Ammar, Mostafa H.
Corner, Mark D.
Zegura, Ellen W.
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Abstract
Disruption tolerant networks (DTNs) are wireless mobile networks
that are characterized by frequent partitions and long delays. Such
networks can be used in highly-challenged environment in which
energy resources are limited. Efficient power management, therefore,
is essential for their success. In this paper, we present a hierarchical
power management in DTNs where nodes are equipped with
two complementary radios: a long-range, high power radio and a
short range, low-power radio. In this architecture, energy can be
conserved by using the low-power radio to discover communication
opportunities with other nodes and then wake up the high-power radio
to undertake the data transmission. We develop a generalized
power management framework and its variations around this idea
and evaluate their relative performance. In addition, for the case in
which traffic load can be predicted, we devise approximation algorithms
to control the sleep/wake-up cycling to provide maximum
energy conservation while discovering enough communication opportunities
to handle a given traffic load. We evaluate our schemes
and our choice of parameters through ns-2 simulations. Our simulation
results show that the generalized power management mechanism
could augment the usefulness of the low power radio and
achieve better energy efficiency than mechanisms relying on one
radio for discovery. In addition, our approximation algorithms reduce
energy consumption from 73% to 93% compared with the
case without power management. We also observe that while an
additional low power radio does reduce the energy consumption
needed for discovery, the improvement could be negligible in mobile
DTNs due to the low density of nodes.
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Date Issued
2006
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Text
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Technical Report