Improving Spectrum Efficiency Through Multi-Hop QoS Analysis and Interference Decomposition in Integrated Access and Backhaul Networks

The dense deployment of Integrated Access and Backhaul (IAB) networks exacerbates spectrum consumption. This paper aims to enhance Spectrum Efficiency (SE) in IAB networks through multi-hop Quality of Service (QoS) analysis and network interference decomposition. We propose a multi-hop delay QoS analysis method that increases computational efficiency and accuracy, thus preventing spectrum over-allocation. We introduce a Transformer-based Interference Path Loss Assessment Neural Network (TIPA-NN) to tackle the issue of inadequate interference information in complex IAB networks, ensuring efficient spectrum reuse. The simulation results show that the proposed QoS analysis method effectively approximates delay unreliability probability across varying hop counts, demonstrating good scalability. The minimum service rate derived supports diverse QoS requirements in multi-hop scenarios. Our algorithm guarantees QoS and enhances SE in IAB networks, outperforming baselines and exhibiting topology-agnostic adaptability. Notably, there is a minimum of 25.03% reduction in subcarrier consumption compared to existing approaches, while ensuring improved SE.