1. State Key Laboratory of Networking and Switching Technology, Beijing University of Posts and Telecommunications, Beijing, China
2. Key Laboratory of Computing Power Network and Information Security, Ministry of Education, Shandong Computer Science Center (National Supercomputer Center in Jinan), Qilu University of Technology (Shandong Academy of Sciences), Jinan, China
3. School of Information and Electronics, Beijing Institute of Technology, Beijing, China
4. Department of Computing, Hong Kong Polytechnic University, Hung Hom, Hong Kong