Throughput Analysis of Small Cell Networks under D-TDD and FFR

TL;DR

This paper analyzes how fractional frequency reuse (FFR) can improve throughput in small cell networks using dynamic TDD, by deriving analytical expressions and optimizing network parameters to enhance performance.

Contribution

It introduces an analytical framework for FFR-based interference coordination in D-TDD small cell networks and optimizes parameters to maximize throughput.

Findings

FFR improves downlink and uplink throughput in D-TDD networks.

Optimized network parameters enhance overall mean packet throughput.

Numerical results confirm the effectiveness of FFR in throughput enhancement.

Abstract

Dynamic time-division duplex (D-TDD) has emerged as an effective solution to accommodate the unaligned downlink and uplink traffic in small cell networks. However, the flexibility of traffic configuration also introduces additional inter-cell interference. In this letter, we study the effectiveness of applying fractional frequency reuse (FFR) as an interference coordination technique for D-TDD small cell networks. We derive the analytical expressions of downlink and uplink mean packet throughput (MPT), then study a network parameter optimization problem to maximize MPT while guaranteeing each user's throughput. Numerical results corroborate the benefits of the proposed FFR-based D-TDD in terms of improving throughput.