Tradeoff Power Control for Cellular Systems

Abstract

We consider distributed uplink open-loop power control for orthogonal frequency division multiple access (OFDMA) cellular systems. To touch simultaneously on two main performance metrics in cellular systems, average throughput and cell-edge throughput, we focus on a metric of tradeoff performance. First we investigate two extreme cases to show that the well-known SNR-based scheme and the INR-based scheme maximize cell-edge throughput and average throughput, respectively. Based on these two extremes, we propose a new power control scheme that trades off well both metrics. The idea is to combine the optimum power of two extremes in a linear fashion. System-level simulations show that the proposed scheme has better tradeoff performance as compared to two schemes: (1) a trivial time-sharing scheme (where a tradeoff curve shows the straight line that connects two extreme points); (2) another alternative (that combines the optimum power of two extremes in an exponential way).