1. School of Communications and Information Engineering, Chongqing University of Posts and Telecommunications, Chongqing, China
2. Department of Graduate Computer Science and Engineering, Katz School of Science and Health, Yeshiva University, New York City, USA
3. Advanced Network and Intelligent Connection Technology Key Laboratory of Chongqing Education Commission of China, Chongqing Key Laboratory of Ubiquitous Sensing and Networking, China