Frequency Reuse in IAB-based 5G Networks using Graph Coloring Methods

Abstract

Integrated Access and Backhaul (IAB) is a new standard for multi-hop 5G networks. It allows to use cellular frequencies for both backhaul and access purposes. Furthermore, wireless backhauling reduces deployment costs for cellular network densification compared to fiber. However, the fact millimeter Wave (mmWave) frequencies have shorter range and considering the additional interference from backhaul links, the deployement of such a solution is a complicated issue. In our vision, a solution for frequency allocation using a graph coloring approach is key in improving performance. In this paper, we propose a semicentralized algorithm where the IAB-Donor computes the pairs of interfering nodes in the network to determine conflicting frequency usage. Nodes are then allocated specific bands and can locally adjust them to communicate with their children. Simulation results show that the proposed solution is more than 50% efficient in terms of throughput compared to a centralized allocation by link coloring.

Milimeter-Wave Massive Mimo: A Promising Technology for New and Emerging Networks

“…Each sector or zone is assigned a different set of frequencies, enabling frequency reuse in a coordinated manner. In [44], spatial reuse is applied where the same frequency resource is used for both backhaul networks and access links with no cross link interference [44]. Spatial reuse helps to circumvent fibre-based backhauling on the bases of cost [45] flexibility and easy execution [46].…”

“…Spectrum management becomes crucial in mitigating interference and ensuring efficient coexistence of neighboring cells. Receivers in interference zone experience high BER which degrades throughput and increases the latency because of frequent retransmissions [44]. Some techniques employed to manage interference in mmWave Massive MIMO systems are: i.…”