Downlink Scheduling for Multi-Cell MIMO Systems

Abstract: In this paper, we study about downlink scheduling for multi-cell multiple-input multiple-output (MIMO) systems. The inter-cell interference experienced by a user is quietly a pre-eminent issue in the communication scenario.Specifically, the performance degradation for the cell-edge users who experience significant inter-cell interference is severe, which may limit the overall system performance. As a result, continuous streaming is not possible and leads to ineffective communication. So in order to overcome these difficulties, we formulate an optimization problem which aims at jointly selecting a user and connecting the user to the tower with high signal strength. We first obtain a calibrated value of signal strength and the distance between tower and the user, which is collectively termed as the RSSI value. The pre-determined RSSI value is fed to the scheduler along with the signal strength to decide as to which tower the user should be switched to. Simulation results show that the performance of the proposed system is better than the existing systems.

Keywords: Scheduling, RSSI, CSI, LDPC.