Realising the potential benefits of using mobile nodes in sensor networks has
shifted a fair amount of interest in exploration of mobility in wireless sensor
networks and also using robots in such networks. Currently research in the area
of mobile sensor networks covers aspects such as clustering, routing,
localisation, node relocation and various other application specific properties
where use of a limited number of mobile nodes can significantly improve various
characteristics of a sensor network.
The main advantages to be gained from a mobile sensor network in
comparison to its static counterpart, are:
Introducing mobility to wireless sensor networks enables development of
applications with a new set of requirements and functionalities that
conventional static sensor networks would not be able to provide or efficiently
support. Use of mobile nodes in sensor networks opens up a vast
amount of new possibilities in this domain. However as solutions to current
shortcoming are unravelled other solutions which were applicable in a static
sensor network now render useless, hence new challenges are exposed.
modifications to current communication protocols have been suggested
which takes into account mobility of sensor nodes. [14,13]
Suggest adoptions of the
LEACH(Low-Energy Adaptive Clustering Hierarchy) protocol
in order make it suitable for more dynamic and mobile environments.
These adoptions are mainly centred around reinitialisation and frequent updates
of local clusters upon nodes joining or leaving them. Likewise new methods for
localisation[16,17] have been suggested that improve upon
previous localisation methods. Such modifications and evolution for
various aspects of sensor networks are briefly covered in the following section.
- prolonging the network lifetime,
- improving network coverage and
- the ability to repair network holes.