1. Jiangsu Key Laboratory of Wireless Communications, Engineering Research Center of Health Service System Based on Ubiquitous Wireless Networks (Ministry of Education), Nanjing University of Posts and Telecommunications, Nanjing, China
2. Beijing Key Laboratory of Network System Architecture and Convergence, School of Information and Communication Engineering, Beijing University of Posts and Telecommunications, Beijing, China
3. Future Mobile Technology Lab, China Mobile Research Institute, Beijing, China