College of Communication and Information Engineering Chongqing University of Posts and Telecommunications Chongqing 400065 P.R.China;
Chongqing Key Laboratory of Mobile Communications Technology Chongqing University of Posts and Telecommunications Chongqing 400065 P.R.China;
Huawei Technologies Co.Ltd. Shenzhen 518129 P.R.China;
Naitional Mobile Communications Research Laboratory Southeast University Nanjing Jiangsu 210096 P.R.China;
Chongqing Key Laboratory of Computational Intelligence Chongqing University of Posts and Telecommunications Chongqing 400065 P.R.China;
College of Communication and Information Engineering Chongqing University of Posts and Telecommunications Chongqing 400065 P.R.China;
Macro-femto heterogeneous network; Base station sleep; Energy consumption;