[16] considers
a simple application where one is interested in counting the number of
targets in the region monitored by the sensor network. The authors consider
a simple model in which the target can be detected as a signal by each sensor,
the amplitude of which decays with the distance to the target. The spacing
of the sensors, and the attenuation profile of the target signal determines the
accuracy of target localization, and the ability to distinguish between targets
that are close to one another. Sensors participate in forming clusters based on
the signal levels they sense. [10] considers an acoustic target tracking application,
for which a heterogeneous network with two kinds of nodes (sensors
and clusterheads), is deployed. The issues addressed are how the clusterheads
collaborate so that the one closest to the target is active, and how sensors collaborate
so that a small but su?±cient number of sensors respond with their
measurements to the activated clusterhead.
6 Sensor Network Implementations
In the previous section, we have looked at some of the important design problems
in WSNs, from a taxonomy-based perspective. However, it may not be
possible to identify all the significant problems of an application through such
an approach. As we shall see in the next few subsections, there are certain
implementation specific design problems which are also significant. Such problems
become apparent when we examine case studies of practical sensor network
deployments and experiments.
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