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Performances des réseaux locaux millimétriques

Mohammed Dahhani 1
1 IRIT-RMESS - Réseaux, Mobiles, Embarqués, Sans fil, Satellites
IRIT - Institut de recherche en informatique de Toulouse
Abstract : With the exponential increase in wireless data traffic risking to overwhelm the current networking infrastructures, millimeter-wave (mmWave) networking is seen as one of the most promising paths out of the logjam. IEEE introduced a new standard, 802.11ad, that uses mmWave frequencies for deli- vering multi-Gigabit capacities in a wireless local area network setting. Such capacities, however, do not come for free. mmWave frequencies have poor propagation characteristics and suffer from blockage, whose consequences on the networking protocols are not fully understood. Throughout this thesis, we first aimed at an in-depth understanding of two key primitives in 802.11ad networks in environments rich with blockage : user association and reliability. Using off-the-shelf hardware and a multi-layer tracing tool allowing unpre- cedented granularity in the analysis of 802.11ad networks, we shed lights on blind spots regarding reliability at both link layer and transport layer. The key innovation of the mmWave standard is its beamforming training protocol. Executed periodically at the beginning of every beacon interval, it enables the formation of directional links. To address contention during the uplink part of beamforming training, 802.11ad introduced A-BFT, an Aloha-inspired, two-level backoff race. While central to initial access in 802.11ad networks, the performance of this protocol, however, remains poorly understood. We proposed an accurate analytical finite-population model for evaluating the performance of 802.11ad A-BFT under the assumption of ideal channel conditions. After using an open-source simulator to demonstrate its accuracy, we use our model to assess the performance of A-BFT. We find that a counter- intuitive, quit- easily/be-lazy approach by the stations leads to the best overall beamforming training performance.
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Submitted on : Thursday, January 28, 2021 - 2:54:13 PM
Last modification on : Thursday, June 10, 2021 - 3:07:20 AM
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  • HAL Id : tel-03124199, version 1

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Mohammed Dahhani. Performances des réseaux locaux millimétriques. Informatique [cs]. Institut National Polytechnique de Toulouse, 2020. Français. ⟨tel-03124199⟩

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