Networked and Embedded Systems Laboratory

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Computer networks have historically considered support for
mobile devices as an extra overhead to be borne by the system.
Recently however, researchers have proposed methods by which
the network can take advantage of mobile components. We
exploit mobility to develop a fluid infrastructure: mobile
components are deliberately built into the system infrastructure
for enabling specific functionality that is very hard to achieve
using other methods. Built-in intelligence helps our system adapt
to run time dynamics when pursuing pre-defined performance
objectives. Our approach yields significant advantages for energy
constrained systems, sparsely deployed networks, delay tolerant
networks, and in security sensitive situations. We first show why
our approach is advantageous in terms of network lifetime and
data fidelity. Second, we present adaptive algorithms that are
used to control mobility. Third, we design the communication
protocol supporting a fluid infrastructure and long sleep durations
on energy-constrained devices. Our algorithms are not based on
abstract radio range models or idealized unobstructed
environments but founded on real world behavior of wireless
devices. We implement a prototype system in which infrastructure
components move autonomously to carry out important
networking tasks. The prototype is used to validate and evaluate
our suggested mobility control methods.

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