1. Beijing Engineering and Technology Research Center for Convergence Networks and Ubiquitous Services, University of Science and Technology Beijing, Beijing, China
2. Beijing Key Laboratory of Network System Architecture and Convergence and the Beijing Laboratory of Advanced Information Networks, School of Information and Communication Engineering, Beijing University of Posts and Telecommunications, Beijing, China
3. Henan Joint International Research Laboratory of Intelligent Networking and Data Analysis, School of Information Engineering, Zhengzhou University, Zhengzhou, China