Song Yunlong, received his B.S. degree in elec- tronic information engineering from Xidian Uni- versity, China in 2009, and finished M.S. degree study in computer architecture from Graduate U- niversity of Chinese Academy of Sciences, Chinain 2011. Currently, he is working toward the Ph.D. degree in Institute of Computing Technology, Chinese Academy of Sci- ences, China. His research interest mainly focuses on Green Networking, Email: songyunlong@ict.ac.cn Liu Min, received her B.S. and M.S. degrees in computer science from Xi'an Jiaotong University, China in 1999 and 2002 respectively, and her Ph. D. degree in computer architecture from Graduate University of Chinese Academy of Sciences, Chi-na in 2008. Currently, she is an associate professor in Institute of Computing Technology, Chinese Academy of Sciences. Her research interests include mobile IP, handoff, network meas- urement, and mobile computing. She is a member of IEEE and ACM. Email: liumin@ict.ac.cn