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SEP-CS: Effective Routing Protocol for Heterogeneous Wireless Sensor Networks
Ahmed M. Khedr and Dina M. Omar

In wireless sensor networks (WSN), most of the attention has been given to the routing protocols since they might differ depending on the application and network architecture. It has been seen from existing hierarchical routing protocols that most of them ensure longer lifetime of the network. However, one of the major challenges in WSN is to prolong the time interval before the death of first node. It can be referred as stability period. Without longer stability period, more information could not be collected from the sensor field even though the lifetime of the network is high. So prolonging the stability period is crucial for many applications. In this paper, the cluster routing protocol SEP (Stable Election Protocol) is considered and improved. We propose a clustering routing protocol named SEP-CS that combines new clustering strategy with compressive sensing (CS) theory to satisfy both energy and stability period constraints under heterogeneous environment in WSNs. The proposed protocol efficiently improves data aggregation and therefore significantly reduces the energy consumed in the process of sampling and transmission, and lowers the wireless bandwidth required for communication. Simulation results show that our improved protocol performs better than the existing protocols in terms of stability period, network lifetime, and network throughout.

Keywords: Cluster based algorithm, compressive sensing, energy efficiency, heterogeneous wireless sensor networks, routing protocols.

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