
182
Wireless Ad Hoc and Sensor Networks
target t
j
is smaller than or equal to the sensing range r
s
i
. Nodes are termed adjacent
or neighbors if they are included in the transmission range of each other.
We assume each sensor s
i
has a failure probability associated with each target
t
j
in the monitored area (denoted by fp
ij
). The failure probability can be set by
manufacturer initially. However many factors can effect the parameter, say weather
in the monitoring area, interferences to the sensors, or unexpected accidents. If we
know the environment in advance, we can predict or calculate the failure probability
easily.
The time is divided into time slots ...