Performance Evaluation of LAA-LBT Based LTE and WLAN's Co-Existence in Unlicensed Spectrum

Sreekanth Dama, Abhinav Kumar, K. Kuchi
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引用次数: 42

Abstract

The license assisted access (LAA) along with listen before talk (LBT) mechanism for access of unlicensed spectrum by LTE is a recent study item of the 3rd Generation Partnership Project (3GPP). The LAA-LBT is expected to be a feature in Release 13 of LTE that will allow mobile operators to utilize the unlicensed spectrum as their secondary carrier for data offloading. However, the unlicensed spectrum is primarily occupied by 802.11 based WLAN devices. Hence, to ensure a fair sharing of this spectrum with WLAN devices, LAA should use a channel access scheme that is compatible with WLANs' distributed coordination function (DCF). Two such channel access schemes for LAA are under consideration with 3GPP. In this work, we thoroughly evaluate these channel access schemes under various traffic scenarios. We show that the fairness of these schemes largely depends on the signal/energy detection threshold used by the LAA-LBT mechanism. Further, through simulation results, we show that there exists a trade off in selection of the detection threshold such that high sensing threshold results in improved overall network throughput at the cost of WLAN's performance; whereas, low threshold results in improved WLAN's performance at the cost of the overall network performance.
基于LAA-LBT的LTE和WLAN在非授权频谱中共存的性能评估
许可辅助接入(LAA)和先听后讲(LBT)机制是第三代合作伙伴计划(3GPP)的最新研究项目。LAA-LBT预计将成为LTE第13版的一个功能,它将允许移动运营商利用未经许可的频谱作为数据卸载的第二载波。但是,未授权频谱主要被基于802.11的WLAN设备占用。因此,为了确保与WLAN设备公平共享该频谱,LAA应使用与WLAN的分布式协调功能(DCF)兼容的信道接入方案。3GPP正在考虑为LAA提供两个这样的信道接入方案。在这项工作中,我们在各种交通场景下全面评估了这些通道接入方案。我们表明,这些方案的公平性在很大程度上取决于LAA-LBT机制使用的信号/能量检测阈值。此外,通过仿真结果,我们表明在选择检测阈值时存在权衡,使得高感知阈值以牺牲WLAN性能为代价提高整体网络吞吐量;然而,低阈值以牺牲整体网络性能为代价来提高WLAN的性能。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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