1. http://www.3gpp.org/technologies/keywords-acronyms/97-lte-advanced
, last visit on February 15 (2018)
2. Author, F.: Cisco visual networking index: global mobile data traffic forecast update, 2015–2020, white paper
3. Global Action Plan, An inefficient truth.
http://www.globalactionactionplan.org.uk
, Global Action Plan Report, Dec. (2017)
4. http://green-broadband.blogspot.com/
5. Han, C., et al.: Green radio: radio techniques to enable energy efficient wireless networks. IEEE Commun. Mag. 49(6), 46–54, June (2011)