1. College of Computer Science, Chongqing University, 174 Shazheng Street, Chonqqing 400044, P. R. China
2. School of Physics and Electronic Science, Qiannan Normal University for Nationalities, Duyun 558000, P. R. China
3. School of Computer and Information Technology, Qiannan Normal University for Nationalities, Duyun 558000, P. R. China
4. State Key Laboratory of Mechanical Transmissions, Chongqing University, 174 Shazheng Street, Chongqing 400044, P. R. China
5. CICT Connected and Intelligent Technologies Co., Ltd, Chongqing 400044, P. R. China
6. Department of Communication and Networking, School of Advanced Technology, Xi’an Jiaotong-Liverpool University, Suzhou 215000, P. R. China