1. State Grid Smart Grid Research Institute Co., Ltd., Beijing 102209, China
2. School of Communications and Information Engineering, Nanjing University of Posts and Telecommunications, Nanjing 210003, China
3. School of Cyber Science and Engineering, Huazhong University of Science and Technology, Wuhan 430074, China
4. Department of Electric and Electronic Engineering, Imperial College London, London SW7 2AZ, UK
5. Electric Power Grid Wireless Communication Technology Laboratory, Beijing 102209, China