Power allocation of Dynamic Point Blanking for downlink CoMP in LTE-Advanced

Coordinated Multiple Point (CoMP) has been adopted in 3GPP LTE-Advanced to improve both the cell average and cell edge throughput. Among various downlink CoMP schemes, Dynamic Point Blanking (DPB) is simple and effective to improve the cell-edge user throughput by dynamic muting of the strongest interference of coordinated points. DPB can be used together with Coordinated Scheduling (CS) as CS/DPB and Dynamic Point Selection (DPS) as DPS/DPB to achieve more cell-edge throughput. However there exists the problem that radio resource may not be fully used due to muting. In this paper, Dynamic Point Reduced Power (DPRP) schemes are proposed to further improve the cell edge throughput. With the proposed methods, each resource block (RB) can be dynamically allocated with zero power, reduced power or a full power. Performance evaluation shows the proposed methods improve cell edge throughput by 30% compared to that of conventional single cell transmission.