1. Artificial Intelligence and Big Data College, Chongqing College of Electronic Engineering, Chongqing, China
2. School of Electronic Engineering, Beijing University of Posts and Telecommunications, Beijing, China
3. School of Computer Science and Technology, Chongqing University of Posts and Telecommunications, Chongqing, China
4. School of Smart Health, Chongqing College of Electronic Engineering, Chongqing, China
5. Department of Mobile Communication Technology Research, China Telecom Research Institute, Beijing, China