This paper analyzes Hybrid Beamforming (HBF) and Multi-User Multiple-Input Multiple-Output (MU-MIMO) in millimeter wave (mmWave) 5th generation (5G) cellular networks considering the full protocol stack with TCP/IP traffic and MAC scheduling. Prior work on HBF and MU-MIMO has assumed full-buffer transmissions and studied link-level performance. We report non-trivial interactions between the HBF technique, the front-loaded channel estimation pilot scheme in NR, and the constraints of MU-MIMO scheduling. We also report that joint multi-user beamforming design is imperative, in the sense that the MU-MIMO system cannot be fully exploited when implemented as a mere collection of single-user analog beams working in parallel. By addressing these issues, throughput can be dramatically increased in mmWave 5G networks by means of Spatial Division Multiple Access (SDMA).
@article{arxiv.2010.06836,
title = {Full-stack Hybrid Beamforming in mmWave 5G Networks},
author = {Felipe Gomez-Cuba and Tommaso Zugno and Junseok Kim and Michele Polese and Saewoong Bahk and Michele Zorzi},
journal= {arXiv preprint arXiv:2010.06836},
year = {2020}
}
Comments
This is the author's pre-print of a paper submitted to IEEE ICC 2021. arXiv admin note: substantial text overlap with arXiv:2010.04220