Network operators are looking towards LTE License Assisted Access (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 upcoming research challenges for LTE-based technologies in unlicensed bands considering the latest developments.
翻译：网络操作员正在寻找LTE 许可证协助进入(LAA),作为将交通卸载到无许可证带以扩大能力的手段,然而,这些带的运作需要遵守某些连接通道进入的共存规则,现有文献对这些规则的描述并不总是符合最新标准,因此,在本文件中,我们澄清LAA的运作,重点是频道进入和提供服务质量(QOS)支持的方法。在共存方面,我们评估LAA在各种QOS设置下对实验试验台无许可证带的无许可证带的无许可证带的无许可证带的功能的影响。最后,我们介绍了根据最新发展情况,在无许可证带的无许可证带的LTE技术即将面临的研究挑战。
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