A Survey of IEEE 802.11ax WLAN Temporal Duty Cycle for the Assessment of RF Electromagnetic Exposure (Wi-Fi 6)

Authors: Yang Y, Vermeeren G, Verloock L, Guxens M, Joseph W

Year: 2025

Category: Electromagnetic Field Exposure Assessment

Journal: Applied Sciences

DOI: 10.3390/app15052858

URL: https://www.mdpi.com/2076-3417/15/5/2858

Abstract

Overview

The rapid expansion of IEEE 802.11ax (Wi-Fi 6) networks calls for precise assessment of radiofrequency electromagnetic field (RF-EMF) exposure in real-world scenarios. This study scrutinizes the temporal duty cycle (DC) of Wi-Fi 6 signals and correlates them with exposure levels under tightly controlled laboratory conditions.

Key Focus

  • Impact of bandwidth variations
  • Multi-user operation scenarios
  • Application type influences on Duty Cycle

Findings

  • Duty Cycle (DC) values vary significantly depending on the service: FTP uploads show the highest mean DC (94.3%) using 20 MHz bandwidth.
  • YouTube 4K video streaming results in burst activity with a maximum DC of 89.2%.
  • Poor radio conditions can increase DC by up to 5% because of lower signal-to-noise ratios, indicating more retransmissions and changes in modulation.
  • When incorporating duty cycle measurements, there is a reduction in average electric-field strength by up to 10%.
  • Maximum weighted exposure is reported at 4.2 V/m, equalling 6.9% of the ICNIRP limit, particularly in multi-user environments.

Conclusion

These findings demonstrate that realistic, scenario-based assessments of Wi-Fi 6 duty cycle are crucial for accurately refining RF-EMF exposure evaluations. This ensures regulatory standards are met and increases our understanding of the potential health risks associated with electromagnetic fields from modern wireless networks. ⚠ There is a clear connection between Wi-Fi 6 usage patterns and increased EMF exposure, warranting attention to safety and public health guidelines.

Wi-Fi 6 RF-EMF exposure duty cycle exposure assessment IEEE 802.11ax health risk multi-user wireless networks
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