To whom correspondence should be addressed. E-mail: fans05@ mails. tsinghua. edu. cn Fan Shuai, born in 1983. He received his M. S. and Ph. D degrees in Electronic Engineering Department of Tsinghua University in 2007 and 2011 respectively. He also received his B.S. degree from Shan- dong University in 2005. His research interests include wireless communications, wireless networks and crosslayer design.