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With both small-cell LTE and Wi-Fi networks available as alternatives fordeployment in unlicensed bands (notably 5 GHz), the investigation into theircoexistence is a topic of active interest, primarily driven by industry groups.3GPP has recently standardized LTE Licensed Assisted Access (LTE-LAA) thatseeks to make LTE more co-existence friendly with Wi-Fi by incorporatingsimilar sensing and back-off features. Nonetheless, the results presented byindustry groups offer little consensus on important issues like respectivenetwork parameter settings that promote "fair access" as required by 3GPP.Answers to such key system deployment aspects, in turn, require credibleanalytical models, on which there has been little progress to date.Accordingly, in one of the first work of its kind, we develop a new frameworkfor estimating the throughput of Wi-Fi and LTE-LAA in coexistence scenarios viasuitable modifications to the celebrated Bianchi \cite{Bianchi} model. Theimpact of various network parameters such as energy detection (ED) threshold onWi-Fi and LTE-LAA coexistence is explored as a byproduct and corroborated via aNational Instrument (NI) experimental testbed that validates the results forLTE-LAA access priority class 1 and 3.

Analytical Modeling of Wi-Fi and LTE-LAA Coexistence: Throughput and Impact of Energy Detection Threshold