Subcarrier allocation for LTE soft frequency reuse based on graph colouring

Abstract

The paper discusses the parametrization of Soft Frequency Reuse (SFR) method to minimize the inter-cell interference. The optimization method to select the subcarrier allocation based on graph colouring is proposed. It is evaluated using numerical model for uniform (honeycomb) and non-uniform (based on sample deployed network) network topologies. The results prove that the proposed optimization method can significantly improve (up to 20%) the throughput comparing to the random subcarrier allocation. We also show that selection of scheduling policy determines the optimal sub-band allocation and different SFR configuration should be used for different types of schedulers.