APIT- HEER (Hybrid Energy Efficient Reactive Protocol for Wireless Sensor Networks)

Dev, Vimal ; Waraich, Sandeep Singh;

The clustering Algorithm is a kind of key technique used to reduce energy consumption. It can increase the scalability and
lifetime of the network. Clustering divide the sensors node into groups, so that sensors communicate information only to
cluster heads and then the cluster-heads communicate the aggregated information to the base station, saves energy and thus
prolonging network lifetime. In this paper, we propose an energy efficient cluster-head selection algorithm for heterogeneous
wireless sensor networks, which is called APIT - HEER (Hybrid Energy Efficient Reactive). This protocol has use APIT
based distance to improve the performance of HEER protocol further. APIT does not allow two CHs within the range of each
other; therefore proposed algorithm always select optimum number of CHs. The proposed HEER has shown significant
improvement over available with respect to network lifetime. The cluster-heads are elected by a probability based on the
ratio between residual energy of each node and the average energy of the network. Moreover, to conserve more energy, in
this we introduce Hard Threshold (HT) and Soft Threshold (ST). Finally, simulations show that our protocol has not only
prolonged the network lifetime but also significantly increased stability period.