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The wireless communications landscape is anticipated to offer new servicelevels following the introduction of the millimeter-wave (mmWave) spectrum toconsumer electronics. With their broad bandwidths and corresponding multi-Gbpsdata rates, these mmWaves are a perfect fit for data hungry applications, suchas streaming video to extended reality devices. However, the latter are alsobound by maximal latency constraints as low as 1 ms. Understanding where suchminuscule time delays lurk requires a close-up study of individual layers inthe network stack. Starting from the bottom up, the present work describes anendeavor at uncloaking the origins of physical layer (PHY) latency in mmWaveWi-Fi networks. It proposes a newly designed simulation framework and shedslight on how any conventional laboratory can be turned into a virtualexperiment setting, speeding up computation. A case study based on the IEEE802.11ad standard demonstrates the framework's ability to track packet latencyat the PHY-level and identify individual bottlenecks. In particular, itevaluates the impact of the number of LDPC decoding iterations on latency inshort transmission sequences.

Keeping up with the bits: tracking physical layer latency in millimeter-wave Wi-Fi networks