Abstract

A wireless sensor network (WSN) is a collection of a large number of sensor nodes that can be used in various application areas (e.g. home, military, and health). It is the result of the advancements in the field of WSNs that enabled the development of low-cost sensor networks. In this paper, we have discussed the past state of WSNs including single and multiple static base stations, and present state of WSNs including single and multiple mobile base stations. We have also points out the problem in WSNs and their efficient solutions. This paper also explored the different techniques used for wireless charging of sensor nodes in WSNs.

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