State Key Laboratory of Networking and Switching Technology Beijing University of Posts and Telecommunications Beijing 100876 China;
Key Laboratory of Universal Wireless Communications (Ministry of Education) Beijing University of Posts and Telecommunications Beijing 100876 China;
Beijing Xiaomi Mobile Software Beijing 100085 China;
Key Laboratory of Universal Wireless Communications (Ministry of Education) Beijing University of Posts and Telecommunications Beijing 100876 China;
State Key Laboratory of Networking and Switching Technology Beijing University of Posts and Telecommunications Beijing 100876 China;