Abstract:
Large range of tiny embedded sensor devices capable of sensing,
communicating and routing data is available now days. Due to higher
failure rate of sensor nodes or their mobility, the sink node might not
exist in their transmission range. We propose an approach which uses
fuzzy logic to deal with diverse QoS requirements of sensor applications.
We have designed, an Intelligent Intermediate Robust Gateway (IIRG)
module, which provides an efficient and consistent QoS based
connectivity to sensor applications to outside world. This Gateway
defines a decision structure needed by sensor network applications to
switch over to any wireless network, in order to make communication
with the remote sink fulfilling application QoS requirement. The result
of our approach shows that it is capable of selecting appropriate network
for range of sensor network applications. So far many different
approaches have been adopted, for making these switching decisions and
among all of these approaches, MADM (Multiple Attribute Decision
Making) is considered as one of the approach for solving such types of
vertical handover problems. The types of few MADM algorithms are
AHP, TOPSIS, MEW and SAW. A comparison between these MADM
algorithms has been done. Results of each algorithm and their response
against the decision ranking have been analyzed. It is observed that
TOPSIS is suffering from non stability in behavior; MEW shows
penalizing behavior towards poor attributes, where as AHP and SAW
shows less risk in decision ranking with minimum standard error mean
and statistical variance.
