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By Samdanis, Konstantinos
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Thus, several different metrics have been proposed that are specific of a system or scenario, depending on the kind of work or application that is provided. For example, indices that aim at measuring the efficiency of a processor unit relate the amount of executed operations with the amount of used energy; indices that target the efficiency of a transceiver system relate the emitted power with the power drained by the system; and for devices that carry telephone calls efficiency is measured in terms of the number of Erlang of carried traffic per unit of energy.
3 Energy efficiency forecast by GreenTouch innovation  platforms, and networks, employing novel, smart, and sophisticated architectures, mechanisms, protocols, and algorithms. In particular, GreenTouch recently announced the potential of reducing the net energy consumption in communication networks up to 90% by 2020 . 3. Hence, it becomes clear that energy efficiency should be studied in a holistic end-to-end network perspective, taking into account all the network layers, and corresponding mechanism and protocols considering a variety of possible network architectures.
Early efforts from the US environmental Protection Agency concentrated on energy efficiency of personal computers (PCs), peripherals, and monitors, establishing a voluntary labeling program referred to as Energy Star in 1992. The European Commission (EC) recognized since 1999 the need for further actions toward energy efficiency and green communications, introducing the code-of-conduct  to drive policies and recommendations for reducing CO2 emissions considering power supplies, digital TV, broadband equipment, and data centers.