Xun Zhaoyong, was born in 1980, obtained his B. S. degree from Beijing University of Posts and Telecommunications in 2003. He is currently working towards the Ph. D. degree at the Department of Computer Science and Technology, Beijing University of Posts and Telecommunications. His research interests include communications software, Next Generation Network, and multimedia communication. To whom correspondence should be addressed. E-mail: liaojianxin@ebupt, com