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A promising solution satisfying the industry's demand to have minimumalterations in LTE for its operation in unlicensed spectrum is duty cycledLTE-U scheme, which adopts discontinuous transmission to ensure faircoexistence with 802.11 (Wi-Fi) WLANs. Even though the scheme guarantees tomaintain Wi-Fi network performance, the fairness among Wi-Fi users stillremains arcane. In this work, we present a practical scenario where LTE-U,despite being discontinuous (by following an ON-OFF cycle), results in not onlyunfair throughput distribution among Wi-Fi users but also causes degradation inWi-Fi APs downlink performance. This is due to the domination of few Wi-Fiusers who harness channel in both ON and OFF durations of LTE-U, namelynon-victim users over those who get access only in OFF duration, called victimusers. In this paper, we studied the performance of victim and non-victim Wi-Fiusers, and Wi-Fi AP while varying LTE-U ON duration (i.e., duty cycle). Apropitious scheme is proposed for WLANs, with regard to ease of implementation,employing Point Coordination Function (PCF) mode of 802.11, promising fairnessamong Wi-Fi users with improvement in the channel utilization of Wi-Fi network.An analytical model is developed to demonstrate guaranteed improvement andvalidate the simulation results.

Revisiting 802.11 for User Fairness and Efficient Channel Utilization in Presence of LTE-U