Lingyang Song is a Professor in the School of Electrical Engineering and Computer Science at Peking University, Beijing, China. He received several best paper awards at the IEEE International Conferences, and won the 2012 IEEE Communications Society Asia Pacific Young Researcher Award and the 2012 NSFC Outstanding Young Investigator Award. His main research interests include cooperative and cognitive communications, physical layer security, smart grids and mobile social networks. Dusit Niyato is an Associate Professor in the School of Computer Engineering at the Nanyang Technological University (NTU), Singapore. He has won international awards including the IEEE Communications Society Asia Pacific Young Researcher Award and the 2011 IEEE Communications Society Fred W. Ellersick Prize. He works in various research areas including cognitive radio, mobile cloud computing, machine-to-machine communications, performance analysis, and optimization of wireless networks. Zhu Han is an Associate Professor in the Electrical and Computer Engineering Department at the University of Houston, Texas. He received an NSF CAREER award in 2010 and the IEEE Fred W. Ellersick Prize in 2011, and he is a Fellow of the IEEE since 2014. He co-authored papers that won several best paper awards at the IEEE International Conferences. His current research interests include wireless networking, security, big data analysis and smart grid. Ekram Hossain is a Professor in the Department of Electrical and Computer Engineering at the University of Manitoba, Canada, where his current research interests include the design, analysis, and optimization of wireless/mobile communications networks, cognitive radio systems, and network economics. He has received several awards including the 2010 and the 2014 University of Manitoba Merit Award (for Research and Scholarly Activities), the 2011 IEEE Communications Society Fred Ellersick Prize Paper Award, and the IEEE Wireless Communications and Networking Conference 2012 Best Paper Award.