Guest Editorial Special Issue on Selected Papers From IEEE Globecom 2020

Energy consumption in communication systems and networks has been a critical problem for network operators and equipment vendors, particularly since the past decade when energy price has been increasing. Many researchers began investigating this problem and made substantial scientific contributions to reduce energy consumption or to improve energy efficiency in communication networks. Noticing this trend, the Green Communication Systems and Network track was first launched in IEEE Globecom 2011 within the Selected Areas in Communications Symposium, and became its own symposium since IEEE Globecom 2016.