Energt Efficient MAC Protocols for Wireless Sensor Network: A Survey
Eleazar Chukwuka, Kamran Arshad

TL;DR
This survey reviews various energy-efficient MAC protocols for Wireless Sensor Networks, categorizing them and discussing their evolution from fixed to adaptive cycles to improve energy conservation.
Contribution
It provides a comprehensive categorization and analysis of WSN MAC protocols, highlighting their development and open research challenges.
Findings
Protocols are categorized into CA, RA, SP, HP.
Energy efficiency has improved through adaptive and dynamic cycles.
Open research questions are identified for future work.
Abstract
Wireless Sensor Network (WSN) is an attractive choice for a variety of applications as no wired infrastructure is needed. Other wireless networks are not as energy constrained as WSNs, because they may be plugged into the mains supply or equipped with batteries that are rechargeable and replaceable. Among others, one of the main sources of energy depletion in WSN is communications controlled by the Medium Access Control (MAC) protocols. An extensive survey of energy efficient MAC protocols is presented in this article. We categorise WSN MAC protocols in the following categories: controlled access (CA), random access (RA), slotted protocols (SP) and hybrid protocols (HP). We further discuss how energy efficient MAC protocols have developed from fixed sleep/wake cycles through adaptive to dynamic cycles, thus becoming more responsive to traffic load variations. Finally we present open…
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