MAC Essentials for Wireless Sensor Networks

TLDR

Wireless sensor networks rely on a broadcast medium that is prone to interference, and their battery‑powered, long‑lived sensors demand highly energy‑efficient MAC protocols, driving recent research toward reducing MAC energy consumption. The paper aims to deliver a comprehensive state‑of‑the‑art survey of WSN MAC protocols, outlining their focus, design guidelines, shortcomings, and the impact of emerging technologies. It presents a thematic taxonomy that classifies MAC protocols by the problems they address, contrasting with prior surveys that grouped them by technique. The study finds that the statistical properties of traffic are the primary factor guiding the choice of an appropriate MAC solution.

Abstract

The wireless medium being inherently broadcast in nature and hence prone to interferences requires highly optimized medium access control (MAC) protocols. This holds particularly true for wireless sensor networks (WSNs) consisting of a large amount of miniaturized battery-powered wireless networked sensors required to operate for years with no human intervention. There has hence been a growing interest on understanding and optimizing WSN MAC protocols in recent years, where the limited and constrained resources have driven research towards primarily reducing energy consumption of MAC functionalities. In this paper, we provide a comprehensive state-of-the-art study in which we thoroughly expose the prime focus of WSN MAC protocols, design guidelines that inspired these protocols, as well as drawbacks and shortcomings of the existing solutions and how existing and emerging technology will influence future solutions. In contrast to previous surveys that focused on classifying MAC protocols according to the technique being used, we provide a thematic taxonomy in which protocols are classified according to the problems dealt with. We also show that a key element in selecting a suitable solution for a particular situation is mainly driven by the statistical properties of the generated traffic.