Wi-Fi和LTE-U共存下的关联公平性

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摘要翻译：
本文研究了在无授权5 GHz频段中，当Wi-Fi和LTE无授权（LTE-U）共存于同一信道时的关联公平性问题。由于信标传输是Wi-Fi中启动关联过程的第一步，我们将关联公平性定义为LTE-U允许Wi-Fi在其占用的占空比非常大的信道上开始发送信标的公平性。根据LTE-U规范，如果一个LTE-U基站确定一个信道是空的，那么它最多可以传输20毫秒，关闭仅1毫秒，占空比为95%。在频谱使用量大的地区，会有Wi-Fi接入点希望共享同一信道的情况，就像今天的Wi-Fi一样。我们从理论和实验两方面研究了如此大的LTE-U占空比对关联过程，特别是Wi-Fi信标发射和接收的影响。我们通过一个使用National Instrument(NI)USRPs的实验装置证明，很大比例的Wi-Fi信标要么不能及时传输，要么不能在LTE-U BS上接收，从而使得LTE-U BS难以响应Wi-Fi使用来调整其占空比。我们的实验结果证实了我们的理论分析。我们将结果与Wi-Fi/Wi-Fi共存进行了比较，并证明LTE-U/Wi-Fi共存在初始关联时是不公平的，因为后者中信标错误的百分比要大得多。因此，本文的结果表明，为了保持关联公平性，LTE-U基站即使认为信道是空的，也不应该在如此高的占空比下传输。
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英文标题：
《Association fairness in Wi-Fi and LTE-U coexistence》
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作者：
Vanlin Sathya, Morteza Mehrnoush, Monisha Ghosh, and Sumit Roy
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最新提交年份：
2018
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分类信息：

一级分类：Electrical Engineering and Systems Science        电气工程与系统科学
二级分类：Signal Processing        信号处理
分类描述：Theory, algorithms, performance analysis and applications of signal and data analysis, including physical modeling, processing, detection and parameter estimation, learning, mining, retrieval, and information extraction. The term "signal" includes speech, audio, sonar, radar, geophysical, physiological, (bio-) medical, image, video, and multimodal natural and man-made signals, including communication signals and data. Topics of interest include: statistical signal processing, spectral estimation and system identification; filter design, adaptive filtering / stochastic learning; (compressive) sampling, sensing, and transform-domain methods including fast algorithms; signal processing for machine learning and machine learning for signal processing applications; in-network and graph signal processing; convex and nonconvex optimization methods for signal processing applications; radar, sonar, and sensor array beamforming and direction finding; communications signal processing; low power, multi-core and system-on-chip signal processing; sensing, communication, analysis and optimization for cyber-physical systems such as power grids and the Internet of Things.
信号和数据分析的理论、算法、性能分析和应用，包括物理建模、处理、检测和参数估计、学习、挖掘、检索和信息提取。“信号”一词包括语音、音频、声纳、雷达、地球物理、生理、（生物）医学、图像、视频和多模态自然和人为信号，包括通信信号和数据。感兴趣的主题包括：统计信号处理、谱估计和系统辨识；滤波器设计；自适应滤波/随机学习；（压缩）采样、传感和变换域方法，包括快速算法；用于机器学习的信号处理和用于信号处理应用的机器学习；网络与图形信号处理；信号处理中的凸和非凸优化方法；雷达、声纳和传感器阵列波束形成和测向；通信信号处理；低功耗、多核、片上系统信号处理；信息物理系统的传感、通信、分析和优化，如电网和物联网。
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英文摘要：
  In this paper we address the issue of association fairness when Wi-Fi and LTE unlicensed (LTE-U) coexist on the same channel in the unlicensed 5 GHz band. Since beacon transmission is the first step in starting the association process in Wi-Fi, we define association fairness as how fair LTE-U is in allowing Wi-Fi to start transmitting beacons on a channel that it occupies with a very large duty cycle. According to the LTE-U specification, if a LTE-U base station determines that a channel is vacant, it can transmit for up to 20 ms and turn OFF for only 1 ms, resulting in a duty cycle of 95%. In an area with heavy spectrum usage, there will be cases when a Wi-Fi access point wishes to share the same channel, as it does today with Wi-Fi. We study, both theoretically and experimentally, the effect that such a large LTE-U duty cycle can have on the association process, specifically Wi-Fi beacon transmission and reception. We demonstrate via an experimental set-up using National Instrument (NI) USRPs that a significant percentage of Wi-Fi beacons will either not be transmitted in a timely fashion or will not be received at the LTE-U BS thus making it difficult for the LTE-U BS to adapt its duty cycle in response to the Wi-Fi usage. Our experimental results corroborate our theoretical analysis. We compare the results with Wi-Fi/Wi-Fi coexistence and demonstrate that LTE-U/Wi-Fi coexistence is not fair when it comes to initial association since there is a much larger percentage of beacon errors in the latter case. Hence, the results in the paper indicate that in order to maintain association fairness, a LTE-U BS should not transmit at such high duty cycles, even if it deems the channel to be vacant.
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PDF链接：
https://arxiv.org/pdf/1801.03817

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关键词：LTE 公平性 Experimental Applications Transmission 关联 共存 LTE 使用