HBF MU-MIMO with Interference-Aware Beam Pair Link Allocation for beyond-5G Mm-Wave Networks

Hybrid beamforming (HBF) multi-user multiple-input multiple-output (MU-MIMO) is a key technology for unlocking the directional millimeter-wave (mm-wave) nature for spatial multiplexing beyond current codebook-based 5G-NR networks. In order to suppress co-scheduled users' interference, HBF MU-MI...

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Bibliographic Details
Published in:IEEE transactions on mobile computing 2025-01, p.1-14
Main Authors: Ichkov, Aleksandar, Wietfeld, Alexander, Petrova, Marina, Simic, Ljiljana
Format: Magazinearticle
Language:English
Subjects:
3GPP
Antennas
Array signal processing
Beyond-5G
BPL allocation
HBF MU-MIMO
Interference
Interference cancellation
interference mitigation
millimeter-wave
Multiaccess communication
Power line communications
Radio frequency
Resource management
Vectors
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Summary:Hybrid beamforming (HBF) multi-user multiple-input multiple-output (MU-MIMO) is a key technology for unlocking the directional millimeter-wave (mm-wave) nature for spatial multiplexing beyond current codebook-based 5G-NR networks. In order to suppress co-scheduled users' interference, HBF MU-MIMO is predicated on having sufficient radio frequency chains and accurate channel state information (CSI), which can otherwise lead to performance losses due to imperfect interference cancellation. In this work, we propose IABA, a 5G-NR standard-compliant beam pair link (BPL) allocation scheme for mitigating spatial interference in practical HBF MU-MIMO networks. IABA solves the network sum throughput optimization via either a distributed or a centralized BPL allocation using dedicated CSI reference signals for candidate BPL monitoring. We present a comprehensive study of practical multi-cell mm-wave networks and demonstrate that HBF MU-MIMO without interference-aware BPL allocation experiences strong residual interference which limits the achievable network performance. Our results show that IABA offers significant performance gains over the default interferenceagnostic 5G-NR BPL allocation, and even allows HBF MU-MIMO to outperform the fully digital MU-MIMO baseline, by facilitating allocation of secondary BPLs other than the strongest BPL found during initial access. We further demonstrate the scalability of IABA with increased gNB antennas and densification for beyond-5G mm-wave networks.
ISSN:1536-1233
1558-0660
DOI:10.1109/TMC.2025.3526547