Wireless Sensor Networks (WSNs) are new category of wireless networks that are
gaining importance in large number in civilian and military applications. WSN is a
distributed and autonomous sensor device used for monitoring physical or environmental
conditions. Sensor nodes are part of WSNs and are tiny in size. They are connected and communicate with each other to exchange
data and information. These nodes are capable of sensing temperature, humidity,
pollution level in environment, atmospheric pressure and transfer these information
to a base station (BS) which is also termed as sink. Some of the applications include
weather monitoring, movement of vehicles in highways, movement of wild animals in
forest, battlefield surveillance and industrial applications. Nodes in the network
communicate among themselves through wireless medium and the same medium is
used to transfer data from sensor nodes to sink. Sensors are equipped with battery
as source of energy which gets drained quickly and in many situations they are not
replaceable. Therefore, there is a need to design protocols for different layers which
are energy aware. The objective of this chapter is to highlight the techniques, issues,
challenges and applications of WSN.
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