1985, graduate, Beijing Jiaotong University, China; 1989, ME, and 1992, DE, Toyohashi University of Technology, Japan. 1992-94, with Fujitsu Laboratories, Japan. 1994, joined Tsinghua University, Beijing, China; currently, Professor and Deputy Dean, School of Information Science and Technology. Fellow, IEEE. Major research interests include queueing theory, traffic engineering, mobile internet, radio resource management of wireless networks, and green communication and networks.