Cross-Link Interference Mitigation With Over-the-Air Pilot Forwarding for Dynamic TDD

TL;DR

This paper introduces an over-the-air pilot forwarding scheme for D-TDD systems that effectively mitigates cross-link interference without backhaul communication, enhancing signal detection performance.

Contribution

It proposes a novel over-the-air pilot sharing method and a dedicated CLI channel estimation scheme to reduce interference and improve detection in D-TDD systems.

Findings

Achieves near-perfect interference rejection without backhaul sharing.

Reduces pilot forwarding errors, improving channel estimation.

Enhances overall signal detection performance.

Abstract

Dynamic time-division duplex (D-TDD) aided mobile communication systems bear the potential to achieve significantly higher spectral efficiency than traditional static TDD based systems. However, strong cross-link interference (CLI) may be caused by different transmission directions between adjacent cells in D-TDD systems, thus degrading the performance. Most existing CLI mitigation schemes require sharing certain information among base stations (BSs) via backhaul links. This strategy is usually expensive and suffers high latency. Alternatively, we propose a pilot information sharing scheme based on over-the-air forwarding of the downlink pilot of the interfering BS to the interfered BS via a wireless terminal, along with a dedicated CLI channel estimation method. Simulation results demonstrate that thanks to the proposed pilot information sharing scheme the classic interference rejection combining (IRC) receiver achieves a signal detection performance highly comparable to that of the IRC detector with perfect pilot information, necessitating no information sharing among BSs via backhaul links. Furthermore, the proposed CLI channel estimation scheme reduces the impact of errors introduced by pilot forwarding, thereby improving the performance of both CLI channel estimation and signal detection.