  With both small-cell LTE and 802.11 networks now available as alternatives
for deployment in unlicensed bands at 5 GHz, investigation into their
coexistence is a topic of great interest. 3GPP Rel. 14 has standardized LTE
licensed assisted access (LAA) that seeks to make LTE more coexistence friendly
with Wi-Fi by incorporating listen before talk (LBT). However, the fairness of
Wi-Fi and LTE-LAA sharing is a topic that has not been adequately explored. In
this work, we first investigate the 3GPP definition of fair coexistence in [1]
via new analytical models. By tuning the LTE-LAA parameters, we exemplify
scenarios when the 3GPP notion of fairness is achieved and conversely, when not
achieved. The formal notions of access and proportional fairness is then
considered for these scenarios to compare and contrast with the 3GPP
definition.
