Energy-efficient design of (5G and beyond 5G) wireless networks
The exponential increase of wireless devices and the demand for higher communication rates has put forward the issue of sustainable growth of modern wireless communication systems. All key players in the wireless community agree that future wireless networks will be required to provide much higher datarates, but at a similar power consumption as present networks. As a consequence, a crucial challenge in future wireless networks will be the maximization of the network energy efficiency, defined as the amount of information which can be transmitted per Joule of consumed energy.
The tutorial is divided into two parts. In the first part, it will be shown how energy efficiency radio resource allocation problems are naturally modeled as a particular class of optimization problems, namely fractional problems. Next, a comprehensive overview on fractional programming theory is provided, presenting classical methods as well as the most recent advances in the field.
The second part of the tutorial will show how fractional programming can be used to develop a general optimization framework which can be applied to optimize the energy efficiency of generic wireless networks. Several practical applications of the framework will be discussed, including the main candidate technologies for 5G networks: heterogeneous networks, massive MIMO systems, multi-hop communications, multi-carrier transmissions. The talk will also show how the framework is general enough to be applied to additional settings, such systems employing physical layer security techniques. Preliminary experimental results performed by the 5G lab Germany will be presented.
Finally, the latest research directions and open issues are discussed, describing the challenges that future cellular networks pose as far as energy-efficient designs are concerned.
Alessio Zappone is a research associate at the Technische Universität Dresden, Dresden, Germany. Alessio received his M.Sc. and Ph.D. both from the University of Cassino and Southern Lazio. Afterwards, he worked with Consorzio Nazionale Interuniversitario per le Telecomunicazioni (CNIT) in the framework of the FP7 EU-funded project TREND, which focused on energy efficiency in communication networks. Since 2012, Alessio is the project leader of the project CEMRIN on energy-efficient resource allocation in wireless networks, funded by the German research foundation (DFG).
His research interests lie in the area of communication theory and signal processing, with main focus on optimization techniques for resource allocation and energy efficiency maximization. He was the recipient of a Newcom # mobility grant in 2014. Alessio currently serves as associate editor for the IEEE SIGNAL PROCESSING LETTERS and has been a guest editor for the IEEE JOURNAL ON SELECTED AREAS IN COMMUNICATIONS (Special Issue on Energy-Efficient Techniques for 5G Wireless Communication Systems).
Eduard A. Jorswieck received the Diplom-Ingenieur (M.S.) degree and Doktor-Ingenieur (Ph.D.) degree, both in electrical engineering and computer science, from the Technische Universität Berlin, Germany, in 2000 and 2004, respectively. He was with the Broadband Mobile Communication Networks Department, Fraunhofer Institute for Telecommunications, Heinrich-Hertz-Institut, Berlin, from 2000 to 2006. From 2006 to 2008, he was with the Department of Signals, Sensors and Systems, Royal Institute of Technology, as a Post-Doctoral Researcher and an Assistant Professor. Since 2008, he has been Professor for Communications Theory with the Technische Universität Dresden, Germany. Currently, he is principal investigator in the excellence cluster center for Advancing Electronics Dresden (cfAED) and founding member of the 5G lab Germany (5Glab.de).
His main research interests are in the area of signal processing for communications and networks, applied information theory, and communications theory. He has authored over 85 journal papers, 11 book chapters, some 225 conference papers and 3 monographs on his research topics. Eduard was a co-recipient of the IEEE Signal Processing Society Best Paper Award in 2006 and co-authored papers that won the Best Paper or Best Student Paper Awards at IEEE WPMC 2002, Chinacom 2010, IEEE CAMSAP 2011, IEEE SPAWC 2012, and IEEE WCSP 2012. He was a member of the IEEE SPCOM Technical Committee (2008– 2013), and has been a member of the IEEE SAM Technical Committee since 2015. Since 2011 until 2015, he has been an Associate Editor of the IEEE TRANSACTIONS ON SIGNAL PROCESSING. Since 2008, continuing until 2011, he has served as an Associate Editor of the IEEE SIGNAL PROCESSING LETTERS, and until 2013, as a Senior Associate Editor. Since 2013, he has served as an Editor of the IEEE TRANSACTIONS ON WIRELESS COMMUNICATIONS.