中文摘要：

SI Pengbo. received the B.E. and Ph.D. degree in communications engineering and communication and information system both from Beijing University of Posts and Telecommunications, Beijing, China, in 2004 and 2009, respectively. He joined Beijing University of Technology, Beijing, China, in 2009, where he is currently an Associate Professor. During November 2007 and November 2008, he was a visiting PhD student at Carleton University, Ottawa, Canada. His research interests include cognitive radio system, heterogeneous wireless networks, distributed wire- less networks. He served as the Technical Program Committee （TPC） Co-Chair of the IEEE ICCC-GMCN＇2013, Program Vice-Chair of IEEE GreenCom＇2013, and TPC member of numerous conferences including IEEE GLOBECOM＇2013/2011, ISC1＇2013, ICUMT＇2013/2012/2011, CHINACOM＇2012. He was the principle investigator of the National Natural Science Foundation of China, Beijing Natural Science Foundation, etc. He is a member of the IEEE. ＊The corresponding author. Email： sipengbo@bjut. edu.cn ZHANG Qion. received the B.E. degree in communications engineering from Beijing University of Technology, Beijing, China, in 2013. She is currently a MS. candidate at Beijing University of Technology. Her research interests include mobile cloud computing and cognitive radio networks. She is a student member of the IEEE. F. Richard Yu. received the PhD degree in electrical engineering from the University of British Columbia （UBC）, Vancouver, Canada, in 2003. From 2002 to 2004, he was with Ericsson （in Lund, Sweden）, where he worked on the research and development of dual mode UMTS/GPRS handsets. He held a position as a Postdoctoral Research Fellow with UBC in 2005 and 2006. He joined Carleton School of Information Technology and the Department of Systems and Computer Engineering （cross-appointment） at Carleton University, Ottawa, Canada, in 2007, where he is currently an Associate Professor. He received the ＂Thousand Talents Program＂ award and joined Beijing U