College of Communication and Information Engineering Chongqing University of Posts and Telecommunications Chongqing 400065 China;
College of Communication and Information Engineering Chongqing University of Posts and Telecommunications Chongqing 400065 China;
College of Communication and Information Engineering Chongqing University of Posts and Telecommunications Chongqing 400065 China;
China Telecom Corporation Limited Chongqing Branch Chongqing 400000 China;