چکیده (انگلیسی):

One of the important factors of Wireless Sensor Networks
(WSNs) is sensors lifetime. Elongating sensors lifetime increases the
benefits from the network capabilities as much as possible. To elongate
WSNs lifetime, power consumption should be reduced. To do so, load
balance technique is applied to distribute the energy consumption among
cluster’s nodes in the WSN. In each cluster, the node that acts as Cluster
Head (CH) is the one that significantly suffers from power consumption
problem. To elongate the WSNs lifetime, different sensor node is elected to
act as CH for a period of time (round). Choosing the proper CH per round
greatly affects the energy efficiency in the network. In this study, a new
protocol for clustered heterogeneous WSNs (called LBEACH) is suggested
to reduce power consumption and prolong the network lifetime. Distributed
clustering methodology, with a novel algorithm to elect cluster heads in
each round, is applied and tested. The elected CH is the node that has the
minimal estimated broadcast cost and the highest residual energy. The
estimated broadcast cost of each node is the estimated cost needed for
sending a message to all other nodes within the same cluster and to the
base-station. LBEACH performance is measured using network lifetime,
power consumption and throughput. By comparing LBEACH performance
with other protocols, Low Energy Adaptive Clustering Hierarchy (LEACH)
and Stable Election Protocol (SEP) protocols, it was found that LBEACH
shows a significant improvement in the network lifetime, power
consumption and throughputs toward Base-Station (BS).