1. School of Computer and Communication Engineering and the Beijing Engineering and Technology Research Center for Convergence Networks and Ubiquitous Services, University of Science and Technology Beijing (USTB), Beijing, China
2. State Key Laboratory of Networking and Switching Technology, Beijing University of Posts and Telecommunications, Beijing, China
3. Shenzhen Key Laboratory of Digital and Intelligent Technologies and Systems, Shenzhen University, Shenzhen, China
4. Information Hub, The Hong Kong University of Science and Technology, Guangzhou, China
5. College of Computer Science and Software Engineering, Shenzhen University, Shenzhen, China