1. Nanjing University of Posts and Telecommunications,School of Internet of Things,Nanjing,China,210003
2. ZTE Corporation,RAN System Design Dept.,Shenzhen,China,518057
3. Nanjing University of Posts and Telecommunications,School of Modern Posts,Nanjing,China,210003
4. University of Hertfordshire,School of Physics, Engineering and Computer Science,Hatfield,UK,AL10 9AB