Graph-Based Dynamic Frequency Reuse in Femtocell Networks

TLDR

We address interference avoidance by resource partitioning in densely deployed femtocell networks to protect UEs near cell boundaries from downlink interference. The method partitions available frequency bands into subbands assigned via graph coloring so that adjacent femtocells use different subbands, optimizing resource efficiency. Simulations show the algorithm balances interference protection and spatial frequency reuse, boosting cell‑edge capacities without reducing average throughput.

Abstract

We address interference avoidance by resource partitioning in densely deployed femtocell networks. The main objective is to protect user equipments (UEs) that are located near the cell boundary of two or more femtocells from detrimental downlink interference. The available frequency bands are divided into subbands that are distributed among femtocells in a way that directly adjacent cells do not occupy the same subbands. For this purpose, a novel centrally controlled resource partitioning method is developed based on graph coloring that assigns subbands in terms of resource efficiency. The proposed algorithm strikes a balance between interference protection and spatial frequency reuse of subbands, and is well suited for randomly deployed wireless networks. System-level simulations reveal that cell edge capacities are significantly boosted without causing a degradation in average system throughput.