Energy efficiency Mechanism of Hierarchical Sleep Modein Heterogeneous Cellular Networks with QoS Constraints

In order to enhance spectral and energy efficiency in heterogeneous cellular networks, we used distributed stable matching to solve user association and resource allocation problems and utilized a hierarchical sleep mechanism to improve energy efficiency with modeling various base stations by stochastic geometry tools. Firstly, a joint optimization of minimized total power consumption based on the system model was proposed, which was under the constraint of user's QoS request. Then we decoupled it into two sub-problems，which were user association with resource allocation and base station sleep respectively. Finally we used stable matching algorithm and voting-based hierarchical sleep mechanism to solve above problem by oneself. Simulation results show that our scheme can effectively decrease system energy consumption，and has a lower user blocking ratio compared with existing sleep mechanisms.