1. State Key Laboratory of Networking and Switching Technology, the School of Information and Communication Engineering, Beijing University of Posts and Telecommunications, Beijing, China
2. China Telecom Research Institute, Beijing, China
3. Beijing Xiaomi Mobile Software, Beijing, China
4. Department of Information Systems Technology and Design, Singapore University of Technology and Design, Singapore
5. Department of Electrical Engineering and Computer Science, Khalifa University, Abu Dhabi, UAE