1. School of Electronic and Electrical Communication Engineering, University of Chinese Academy of Sciences, Beijing, China
2. Aerospace Information Research Institute, Chinese Academy of Sciences, Beijing, China
3. Department of Computer Science, California State Polytechnic University, Pomona, CA, USA
4. Department of Mathematics, Physics and Electrical Engineering, Northumbria University, Newcastle-upon-Tyne, U.K.
5. Shanghai Institute of Microsystem and Information Technology, Chinese Academy of Sciences, Shanghai, China
6. IoT Thrust and the Research Center for Digital World with Intelligent Things (DOIT), The Hong Kong University of Science and Technology (Guangzhou), Guangzhou, China
7. School of Informatics, University of Leicester, Leicester, U.K.