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Joint Graph-Based User Scheduling with LFoV Beamforming Design for B5G/6G NTN Systems

Year: 2025

Type: conference-paper

Abstract: In this paper, we address the user scheduling problem for Low Earth Orbit (LEO) Multi-User (MU) Multiple-Input-Multiple-Output (MIMO) Non-Terrestrial Network (NTN) systems, aiming at maximizing the average per-user throughput while minimizing the total number of clusters. We introduce a graph-based scheduling approach utilizing Iterative Maximum Independent Set Search and Removal (IMISSR) with a constant graph density, combined with Limited Field of View (LFoV) Subarray architecture based on Signal-to-Leakage-andNoise Ratio (SLNR) beamforming. Users are clustered based on the channel coefficient of correlation (CoC) as a dissimilarity metric and served via Space Division Multiple Access (SDMA) using the proposed digital beamforming design on a cluster basis. These clusters are then allocated to different time slots using Time Division Multiple Access (TDMA). The results, presented in terms of per-cluster sum-rate capacity and peruser throughput, show that the combined IMISSR and LFoV beamforming approach greatly improves the system performance compared to conventional schedulers.

Source: IEEE-APS Topical Conference on Antennas and Propagation in Wireless Communications (APWC)

DOI: 10.1109/apwc65665.2025.11190467

Authors: M. Rabih Dakkak, Daniel Gaetano Riviello, Alessandro Guidotti, Alessandro Vanelli-Coralli

Institutions: University of Bologna, Institute of Electronics, Computer and Telecommunication Engineering, National Research Council, Consorzio Nazionale Interuniversitario per le Telecomunicazioni

Language: English

Topic: Satellite Communication Systems

Subfield: Aerospace Engineering

Field: Engineering

Domain: Physical Sciences

SDG: Industry, innovation and infrastructure

Open Access status: green

OpenAlex ID: W4415125196

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