TL;DR
This paper investigates how NR-U's numerology and mini-slots affect coexistence with Wi-Fi in the 5 GHz band, using simulations and FPGA experiments to analyze channel access fairness and propose improvements.
Contribution
It introduces a downlink channel access simulation model for NR-U, validates it with real prototypes, and compares NR-U with LAA to highlight coexistence challenges and potential solutions.
Findings
NR-U can improve bandwidth utilization over LAA.
Fair coexistence between NR-U and Wi-Fi is not guaranteed without new mechanisms.
Replacing LAA with NR-U can enhance fairness and efficiency.
Abstract
Coexistence between cellular systems and Wi-Fi gained the attention of the research community when LTE License Assisted Access (LAA) entered the unlicensed band. The recent introduction of NR-U as part of 5G introduces new coexistence opportunities because it implements scalable numerology (flexible subcarrier spacing and OFDM symbol lengths), and non-slot based scheduling (mini-slots), which considerably impact channel access. This paper analyzes the impact of NR-U settings on its coexistence with Wi-Fi networks and compares it with LAA operation using simulations and experiments. First, we propose a downlink channel access simulation model, which addresses the problem of the dependency and non-uniformity of transmission attempts of different nodes, as a result of the synchronization mechanism introduced by NR-U. Second, we validate the accuracy of the proposed model using FPGA-based…
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