Information Technology Reference
In-Depth Information
Chapter 6
Mobility Aspects in WSN
Aleksandra Mateska, Liljana Gavrilovska, and Sotiris Nikoletseas
6.1
Introduction
Wireless Sensor Network (WSN) is a collection of sensor nodes able to sense their
environment, collect and process various data, and communicate among each other.
The introduction of mobility of sensor nodes can significantly affect and improve
the overall network performances. Sensor nodes may move by self-driving (e.g.
mounted on wheels) or by being attached to transporting devices (e.g. robots, people,
vehicles, or animals) resulting in longer network lifetime, better area coverage, and
dynamic adaptation to different system functionalities and requirements.
Mobile WSNs may include sensor nodes , actuators , relays , and sinks (see
Fig. 6.1 ). Actuators are nodes that may dynamically act upon received information,
both on sensors and on environment. Relays usually forward the information from
the sensors to the so called sink (a data collector and a possible gateway to the
backbone network).
The rapid progress of wireless communication and distributed embedded sensor
technology has led to the development of many applications of mobile sensor net-
works. The various applications range from natural ecosystem to security monitor-
ing, particularly in inaccessible terrains or disaster relief operations [ 1 ].
This chapter presents a classification of mobility models based on the mobile enti-
ties the models are applied on. Then it presents detailed description of sensor mobility
and its impact on coverage and network topology, as well as its possible impact for
sensing enhancement. In addition, existing data dissemination protocols in WSNs with
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