In this paper, an Enhanced Threshold Sensitive Stable Election Protocol using Fuzzy Logic (ETSSEPFL) is proposed to prolong the lifespan of heterogeneous wireless sensor networks (HWSNs). It improves existing SEP and TSEP protocols by using a fuzzy logic expert system which intelligently assigns cluster heads (CHs) which lead to energy efficient HWSN. The focus is on two linguistic variables for the design of a fuzzy expert system, which include residual energy and distance to a base station (BS). The simulation results of this research are compared with SEP and TSEP protocols to evaluate the performance of the proposed routing protocol. The evaluation concludes that the proposed routing protocol is better in prolonging network lifetime, increasing stability period and throughput. ETSSEPFL builds a more stable routing environment as compared to SEP and TSEP.
The multitude of possible applications supported by wireless sensor networks (WSNs) has generated much interest from the research community. The recent advancement in technology have enabled the development of low cost, energy-efficient and versatile wireless sensing devices. The wireless sensor networks (WSNs) have dynamic and distributed nature which introduces very special requirements for the routing protocols that should be fulfilled. The most significant feature of a routing protocol is the energy efficiency and the extension of the network lifetime, in order to be efficient for WSNs. The Threshold Sensitive Stable Election Protocol (TSEP) is a three level heterogeneous reactive routing protocol. The energy dissipation is reduced due to energy heterogeneity and prolongs network lifetime, increases the stability period and throughput.
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