BAI Juan, is currently a Ph.D. candidate at Beijing University of Posts and Telecommunications (BUPT). Her major research is physical-layer security in sto- chastic wireless networks, TAO Xiaofeng, received his B.S degree in electrical engineering from Xi'an Jiaotong University, China, in 1993, and M.S.E.E and Ph.D. degrees in telecommunication engineering from Beijing University of Posts and Telecommunications (BUPT) in 1999 and 2002, respectively. He was a visiting Professor at Stanford University from 2009 to 2011, chief architect of Chinese National FUTURE 4G TDD working group from 2003 to 2006 and established 4G TDD CoMP trial network in 2006. He is currently a Professor at BUPT, Fellow of lET, the inventor or co-inventor of 60 patents, the author or co-author of 120 papers, in 4G and beyond 4G. *The corresponding author. Email: taoxf@bupt.edu.cn XU Jin, received her Ph.D. degree in telecommunication engineering from Beijing University of Posts and Telecommunications (BUPT) in 2008. Currently, she is a faculty member at BUPT. Her research interests include resource management and optimization, interference cancellation, and wireless network security.