Tang Tao, born in 1983. She has been in the Ph. D. program of communication engineering at Har- bin Institute of Technology. She received her B. S. and M.S. degrees respectively from Harbin Institute of Technology and Harbin engineering University in 2006 and 2008. Her research interests include wireless sen- sor networks.To whom correspondence should be addressed. E-mail: tt8854@ 126. com