1. School of Transportation and Logistics, National United Engineering Laboratory of Integrated and Intelligent Transportation, and the National Engineering Laboratory of Integrated Transportation Big Data Application Technology, Southwest Jiaotong University, Chengdu, China
2. School of Information Science and Technology, Southwest Jiaotong University, Chengdu, China
3. Department of Communication Engineering, Dalian Maritime University, Dalian, China
4. Department of Electrical and Computer Engineering, McMaster University, Hamilton, ON, Canada