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Carrier Sense Multiple Access (CSMA) is widely used as a Medium AccessControl (MAC) in wireless networks due to its simplicity and distributednature. This motivated researchers to find CSMA schemes that achieve throughputoptimality. In 2008, it has been shown that a simple CSMA-type algorithm isable to achieve optimality in terms of throughput and has been given the name"adaptive" CSMA. Lately, new technologies emerged where prolonged battery lifeis crucial such as environment and industrial monitoring. This inspired thefoundation of new CSMA based MAC schemes where links are allowed to transitioninto sleep mode to reduce the power consumption. However, throughput optimalityof these schemes was not established. This paper therefore aims to find a newCSMA scheme that combines both throughput optimality and energy efficiency byadapting to the throughput and power consumption needs of each link. This isdone by controlling operational parameters such as back-off and sleeping timerswith the aim of optimizing a certain objective function. The resulting CSMAscheme is characterized by being asynchronous, completely distributed and beingable to adapt to different power consumption profiles required by each linkwhile still ensuring throughput optimality. The performance gain in terms ofenergy efficiency compared to the conventional adaptive CSMA scheme isdemonstrated through computer simulations.

Energy Efficient and Throughput Optimal CSMA Scheme