1. State Key Laboratory of Networking and Switching Technology, Beijing University of Posts and Telecommunications, Beijing 100876, China
2. School of Science and Engineering, The Chinese University of Hong Kong (Shenzhen), Shenzhen 518172, China
3. College of Information Science and Electronic Engineering, Zhejiang University, Hangzhou 310027, China
4. Research Institute of Smart Transportation, Xidian University, Xi’an 710071, China
5. College of Electronics and Information Engineering, Shenzhen University, Shenzhen 518060, China
6. Department of Information Systems Technology and Design, Singapore University of Technology and Design, Singapore 487372, Singapore
7. Communications Research Centre Canada, Ottawa, Ontario K2K 2Y7, Canada
Corresponding author: Mugen PENG
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