Adaptive configuration of antenna down tilt for optimizing coverages in IMT-Advanced systems

In this paper a new closed loop coverage control algorithm is presented to adaptively adjust the step length in each optimization period. This algorithm guarantees the signal quality of the users, meanwhile limits the inter-cell interference within a reasonable range. The key parameter indicators (KPIs) this algorithm bases on are reference signal receive power (RSRP) and signal to interference plus noise ratio (SINR) fed back from mobile users. Simulation results show that the proposed algorithm can lead to approximately 35% improvement in the system throughput, and almost double the value of SINR for the users at cell edge.