Special Issue Article
ASH-HEED Protocol for Heterogeneous Wireless Sensor Networks
The Wireless SensorNetwork (WSN) consisting of a large number of sensors are effective for gathering data in a variety of environments. Sensors are usually randomly deployed where battery replacement or recharge is difficult or even impossible to be performed. In this paper, we first completely analyze the basic distributed clustering routing protocol LEACH (Low Energy Adaptive Clustering Hierarchy).The classical schemesconsider that all nodes are deployed with same amount of energy. Here we consider a heterogeneous medium, i.e. each node is provided with varying power levels called Heterogeneous - Hybrid Energy Efficient Distributed Protocol (H-HEED). Heterogeneity can be implemented by various parameters here we consider node energy as the basic parameter. Transmitting data from each node of the sensor field may lead to high power consumption and unreliable network lifetime. In order to avoid this we go for clustering and election of cluster heads. Cluster head alone transmits the aggregate data of the cluster. Theformation of the clusters and cluster head selection are done bycomparing the residual energy of the individual inevery round this improves the lifetime to a considerable level. Also we introduce a node scheduling scheme in HEED. The nodes are classified into ACTIVE and SLEEP nodes. The best solution for energy –saving is to making the nodes in sleep mode with results in power consumption.Finally the simulation result demonstrates that proposed work achieves longer lifetime and more effective data packets in comparison with the HEED and LEACH protocol.