Revisiting LTE LAA: Channel access, QoS, and Coexistence with Wi-Fi
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Network operators are looking towards LTE-LAA as a means of extending capacity by offloading traffic to unlicensed bands. However, operation in these bands requires abiding to certain coexistence rules in terms of channel access. The description of these rules in existing literature is not always in line with the latest standards. Therefore, in this paper, we clarify the operation of LAA, focusing on channel access and methods of providing Quality of Service (QoS) support. In terms of coexistence, we evaluate the impact of LAA under its various QoS settings on Wi-Fi performance in an experimental testbed. Finally, we describe the future evolution of LTE-based technologies in unlicensed bands considering the latest developments.
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