inuously transmitting protocol, as well as a periodically transmitting protocol to transmit a variety of control and reference signals. Wi-Fi, on the contrary, is designed to coexist with other technologies through random backoff and channel sensing. As a result, Wi-Fi users would have a slight chance to sense a clear channel and to transmit. To ensure fair spectrum sharing and [practically] minimum inter-system interference among different wireless technologies operating in the unlicensed spectrum, 3GPP has specified a number of Wi-Fi coexistence mechanisms. These mechanisms operate in time, frequency, or power domains. In the frequency and time-domain schemes, the goal is to separate trans- missions of LTE and Wi-Fi in frequency and time, respectively, while in the power domain, the goal is to adjust the output power of LTE nodes to a tradeoff between LTE throughput and opportunistic Wi-Fi transmission. Prior to any specification work on LAA, 3GPP con- ducted studies to investigate the feasibility of LTE operating in unlicensed bands [9]. The focus of those studies was fair sharing and coexistence with Wi-Fi systems where the crite- rion used to ensure coexistence was that an LAA network does not impact existing Wi-Fi neighbors more than another Wi-Fi network. We discussed earlier that there are two design options for LTE-based LAA LBT, that is, asynchronous and synchronous LBT. The main difference between them lies in the fact that the asynchronous LBT is based on the current DCF protocol. In this case, the LBT scheme may use IEEE 802.11 RTS/CTS signals to ensure that the channel is idle just at that moment. However, synchronous LBT is considered as a special version of asynchronous LBT, wherein, data subframes are synchronized with the licensed LTE carrier. This LBT approach required minimal changes to the LTE specifications and could use inter-cell inter- ference coordination (ICIC) mechanism already defined in earlier releases of LTE to man- age the interference among LTE base stations. The ICIC mechanism i