Network Lifetime Evaluation in Heterogeneous WSN with Different Node Placement Distributions

Abstract

In this paper, the effect of different node placement strategies on maximizing the lifetime of heterogeneous wireless sensor network is investigated. Normal, exponential, and uniform node placement distributions are utilized. Maximum likelihood estimation technique and the locations of nodes with uniform distribution are utilized to estimate the defining parameters of the normal and the exponential distributions. Stable Election Protocol (SEP) and LEACH protocols are used to evaluate the performance of different node location distributions in terms of stability and instability periods, network lifetime and throughput. It has been noticed that different node distributions have almost the same stable and unstable regions in SEP protocol with the same heterogeneity parameters. Moreover, an improvement of 25% in stability region is noticed in SEP protocol with uniform and normal distributions compared to LEACH protocol with the same heterogeneity parameters. Likewise, an improvement of 30% is noticed in stability region of the exponential distribution compared to LEACH protocol with the same heterogeneity parameters. It has been also shown that normal distribution has a slightly larger throughput compared to the uniform and exponential distributions.