1. Beijing Key Laboratory of Transportation Data Analysis and Mining, Beijing Jiaotong University, Beijing, China
2. Engineering Research Center of Network Management Technology for High Speed Railway of Ministry of Education, Beijing Jiaotong University, Beijing, China
3. State Key Laboratory of Rail Traffic Control and Safety, Beijing Jiaotong University, Beijing, China
4. School of Communications and Information Engineering, Chongqing University of Posts and Telecommunications, Chongqing, China
5. vivo Mobile Communication Company Limited, Beijing, China
6. China Unicom Research Institute, Beijing, China