Dept. of Electronic Eng. , Shanghai Jiaotong Univ. , Shanghai 200240, China;
Dept. of Electronic Eng. , Shanghai Jiaotong Univ. , Shanghai 200240, China;
Dept. of Electronic Eng. , Shanghai Jiaotong Univ. , Shanghai 200240, China;
virtual backbone; connected dominating sets(CDS); wireless sensor networks;