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Throughput Improvement by Power Reallocation in Multi-Cell Coordinated Power Control

Multi-cell coordinated power control coordinates transmit-power allocation of tens or hundreds of cells to control mutual interferences among them, which leads to the improvement of spectral efficiency. In the coordinated power control, transmit powers are determined so as to satisfy the minimum required SINRs of mobile terminals. As a result, most of the base stations usually have room to increase their transmit powers to improve spectral efficiency. In this paper, we propose two methods: a scaling method and a linear programming method. These methods reallocate transmit powers to increase spectral efficiency without decreasing the number of mobile terminals satisfying their minimum required SINRs. We evaluated the proposed methods by computer simulations and confirmed that the linear programming method improves spectral efficiency by 40-percent.