1. School of Internet of Things Engineering, Jiangnan University, Wuxi 214122, China; State Key Laboratory of Integrated Services Networks (Xidian University), Xi'an 710071, China
2. School of Internet of Things Engineering, Jiangnan University, Wuxi 214122, China
3. Qualcomm, San Jose CA 95110, USA
4. Beijing National Research Center for Information Science and Technology, Tsinghua University, Beijing 100084, China
5. Banma Network Technology Co., Ltd., Shanghai 200000, China
6. School of Internet of Things Engineering, Jiangnan University, Wuxi 214122, China; Jiangsu Future Networks Innovation Institute, Nanjing 211111, China