The Long Term Evolution (LTE) in unlicensed spectrum is an emerging topic in the 3rd Generation Partnership Project (3GPP), which is about an operation of the LTE system in the unlicensed spectrum via license-assisted carrier aggregation. The 5 GHz Unlicensed National Information Infrastructure (U-NII) bands are currently under consideration, but these bands are also occupied by Wireless Local Area Networks (WLAN), specifically those based on the IEEE 802.11a/ac technologies. Therefore, an appropriate coexistence mechanism must be augmented to guarantee a peaceful coexistence with the incumbent systems. With this regard, our focus lies on the evaluation of all the proposed coexistence mechanisms so far in a single framework and making a fair comparison of them. The coexistence mechanisms covered in this work includes static muting, listen-before-talk (LBT), and other sensing-based schemes that make a use of the existing WLAN channel reservation protocol.
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机译：无执照频谱中的长期演进（LTE）是第三代合作伙伴计划（3GPP）中的一个新兴主题，它与LTE系统在无执照频谱中通过许可辅助载波聚合的操作有关。当前正在考虑5 GHz非许可国家信息基础架构（U-NII）频段，但是这些频段也被无线局域网（WLAN）占用，特别是那些基于IEEE 802.11a / n / ac技术的频段。因此，必须增强适当的共存机制，以保证与现有系统的和平共处。在这方面，我们的重点是在一个单一框架内评估所有提议的共存机制，并对它们进行公平比较。这项工作涵盖的共存机制包括静态静音，先听后听（LBT），以及其他利用现有WLAN信道预留协议的基于感知的方案。
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