Cooperative Sleep-mode and performance modeling for heterogeneous mobile network

Configuration of eNB Sleep-mode is a promising strategy in improving network energy efficiency of next generation mobile networks. The main idea of sleep-mode mechanism is to reduce the energy consumption of cells during the periods when they are not necessary due to low traffic. In this paper, we propose a cooperative sleep-mode strategy for heterogeneous mobile networks where several small cells supply the overlapping coverage, and provide a mathematical model for analyzing the performance of the strategy. Specifically, we develop a cooperative sleep-mode mechanism, which is implemented by an Adaptive sleep-mode mechanism (ASM) algorithm. We then use E/M/1 and E/M/n queuing model to analyze the energy efficiency of our proposed algorithm. Our model takes into account the traffic density and system transmission capacity. We also conduct intensive simulation experiments based on the model with realistic broadband channel propagation conditions, to verify advantages of the cooperative sleep mode for improving network energy efficiency and demonstrate the effectiveness of our analytical model.