1. National Digital Switching System Engineering and Technological Research CenterNo.7 Jianxue StreetZhengzhouPeople's Republic of China
2. Department of Information and Communication EngineeringSchool of Computer and Communication EngineeringZhengzhou University of Light Industry11building No.5, No.7 Jianxue Street, Jinshui DistrictZhengzhouPeople's Republic of China