Interference Mitigation and Capacity Enhancement based on Dynamic Frequency Reuse for Femtocell Networks

TL;DR

This paper proposes a dynamic frequency reuse scheme for femtocell networks that enhances capacity and reduces interference, especially protecting cell edge users, resulting in improved throughput and lower outage probability.

Contribution

It introduces a novel dynamic frequency reuse method for femtocell deployment within macrocells, including a protective scheme for edge users, outperforming existing schemes.

Findings

Higher throughput compared to existing schemes

Lower outage probability achieved

Effective interference mitigation for femtocell networks

Abstract

Wireless networks employing small cells like femtocells are considered to be the choice of network deployment for 4G or advanced networks. This hierarchical deployment of cells introduces the necessity of effective frequency planning for mitigation of interference between different layers of network. As the scarce spectrum resources are likely to be reused to increase spectral efficiency, interference free signal reception has to be guaranteed to ensure better quality of service (QoS). In this paper we propose a dynamic frequency reuse scheme for the deployment of femtocells within a macrocell with the femtocells reusing the spectrum of neighbouring macrocells. We also provide a protective scheme for cell edge femtocell users as they are vulnerable to interference signals from neighbouring macrocells. A detailed frequency planning is provided to maximize spectral reuse while providing maximum throughput. We compare our proposed scheme with other frequency allocation schemes already described in literature. Simulation results shows that our scheme provides better throughput and ensures lower outage probability.