دانلود رایگان مقاله انگلیسی تجزیه و تحلیل شارژ از راه دور برای شبکه های حسگر بی سیم - الزویر 2018

Abstract

Efficient energy consumption is a challenging problem in wireless sensor networks especially close to the sink node, known as the energy hole problem. Various policies for recharging battery exhausted nodes have been proposed using special recharging vehicles. The focus in this paper is on a simple recharging policy that permits a recharging vehicle, stationed at the sink node, to move around and replenish any node’s exhausted battery when a certain recharging threshold is violated. The minimization of the recharging distance covered by the recharging vehicle is shown to be a facility location problem, and particularly a 1-median one. Simulation results investigate various aspects of the recharging policy – including an enahnced version – related to the recharging threshold and the level of the energy left in the network nodes’ batteries. In addition, it is shown that when the sink’s positioning is set to the solution of the particular facility location problem, then the recharging distance is minimized irrespectively of the recharging threshold.

7. Conclusions

A simple recharging policy was introduced in this paper, allowing a recharging vehicle stationed at the sink node to recharge other nodes’ batteries when failing under a certain recharging threshold. The objective was to minimize the distance traveled by the recharging vehicle. As it was shown here, this distance minimization problem can be formulated as a 1-median problem. The presented simulation results demonstrate the behavior of the proposed policy and reveal a significant decrement with respect to the recharging distance when the analytical results are used. An enhanced version of this policy is also employed and simulation results are derived showing an improvement in performance. Eventually, as it is clearly demonstrated, if the sink is located at the particular node that is the solution of the formulated 1-median problem, then the covered distance under the proposed recharging policy is minimized.