中文摘要：

CHEN Zhuo, received the B.S. and M.S. degrees in computer science and engineering from Chongqing University, China in 2002 and 2006, respectively. He is now a Ph.D. candidate at the National Key Laboratory of Science and Technology on Communications, University of Electronic Science and Technology of China. His current research interests include P2P network and multimedia communications. FENG Gang, received his B.E. and ME. degrees in electronic engineering from the University of Electronic Science and Technology of China （UESTC） in 1986 and 2989, respectively, and his Ph.D. degree in information engineering from Chinese University of Hong Kong, China in 1998. He joined the School of Electric and Electronic Engineering, Nanyang Technological University, Singapore in December 2000 as an Assistant Professor and was promoted as an Associate Professor in October 2005. At present he is a Professor with the National Laboratory of Communications, UESTC. Prof. Feng has extensive research experience and has published widely in computer networking and wireless networking research. His research interests include P2P network and applications, network coding theory, DTN, etc. Prof. Feng is also a senior member of IEEE. The corresponding author. Email： fenggang@uestc.edu.cn LU Yi, received his B.S. and M.S. degrees in electrical engineering from University of Electronic Science and Technology of China, Chengdu in 2009 and 2012, respectively. His research interests include P2P network and multimedia communications. ZHOU Yang, received his B.S. and M.S. degrees in computer science and engineering from Chongqing University, China in 2002 and 2006, respectively. He is now a Ph.D. candidate at the College of Computing, Georgia Institute of Technology, USA. His current research interests include cloud computing and data mining.