肖百龙:To whom correspondence should be addressed. E-mail: xb173@ 163.com; Xiao Bailong born in 1973. He is a Ph. D candi-date in School of Communication and Information Engi-neering, University of Electronic Science and Technology of China (UESTC). He also received his B.S. degree from Hunan University of Science and Technology in 1995 and M.S. degree from UESTC in 2000 respectively. His research interests include the design of algorithms for routing, MAC, mobility and security management in mobile ad hoc networks.