1. Key Laboratory of Mobile Communication Technology and Engineering Research Center of Mobile Communication Ministry of Education, School of Communication and Information Engineering, Chongqing University of Posts and Telecommunications, Chongqing, China
2. Key Laboratory of Electronic and Information Engineering, Southwest Minzu University, Chengdu, China
3. Interdisciplinary Centre for Security, Reliability and Trust (SnT), University of Luxembourg, Luxembourg, Luxembourg
4. School of Information and Communication Engineering, University of Electronic Science and Technology of China (Qingshuihe Campus), Chengdu, Sichuan, China