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Studying the Impact of LTE-U on Wi-Fi Downlink Performance

Amr Abdelfattah 1 Naceur Malouch 1
1 NPA - Networks and Performance Analysis
LIP6 - Laboratoire d'Informatique de Paris 6
Abstract : To address the mobile data growth challenges, mobile operators need to access more spectrum resources. LTE in unlicensed spectrum (LTE-U) has been proposed to extend the usual operation of LTE in licensed spectrum to cover also unlicensed spectrum, mainly at 5 GHz band due to its wide spectrum availability. However, this extension poses significant challenges especially regarding the coexistence between LTE-U and legacy systems like Wi-Fi. In case of LTE-U adopts Time-Division Multiplexing (TDM) schemes to share the spectrum with Wi-Fi, we expect performance degradations of Wi-Fi networks. In this paper, we quantify the impact of TDM schemes on Wi-Fi performance in a coexistence scenario. We provide an analytical model to compute the probability of collision faced by Wi-Fi and its downlink throughput performance. This model provides an upper bound of the probability of collision that could be faced by a finite number of Wi-Fi stations. NS3 simulations show that the model estimates accurately the collision probability and the throughput experienced by Wi-Fi. The model is then used to study and compare different coexistence schemes showing for instance that the Wi-Fi frame size impacts globally the performance of Wi-Fi users.
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https://hal.archives-ouvertes.fr/hal-01404091
Contributor : Amr Abdelfattah <>
Submitted on : Monday, November 28, 2016 - 12:48:31 PM
Last modification on : Friday, January 8, 2021 - 5:38:04 PM
Long-term archiving on: : Tuesday, March 21, 2017 - 3:15:46 AM

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Amr Abdelfattah, Naceur Malouch. Studying the Impact of LTE-U on Wi-Fi Downlink Performance. 2016 IEEE 12th International Conference on Wireless and Mobile Computing, Networking and Communications (WiMob), Oct 2016, New York, United States. ⟨hal-01404091⟩

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