Cooperation based resource allocation for improving inter-cell fairness in femtocell systems

In this paper, we focus on the guarantee of inter-cell fairness in OFDM femtocell systems. To solve this problem, we formulate an optimization problem to maximize the summation of logarithmic cell capacity. Based on analytic results, we propose an enhanced modified iterative water-filling algorithm which improves inter-cell fairness compared to a modified iterative water-filling algorithm. The key feature of the proposed algorithm is that each cell performs power allocation to minimize the interference that it causes to a heavy traffic cell to ensure the inter-cell fairness. We verify the effectiveness of the proposed algorithm with respect to fairness improvement and the little degradation of sum capacity by intensive simulations.