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arXiv 1704.08152cs.ITmath.IT
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基于随机几何的超级Wi-Fi网络覆盖和速率分析

Coverage and Rate Analysis of Super Wi-Fi Networks Using Stochastic Geometry

Neelakantan Nurani Krishnan, Gokul Sridharan, Ivan Seskar, Narayan Mandayam

摘要:

最近由联邦通信委员会(FCC)提出的允许未经许可使用电视空白(TVWS)信道的监管变化为设计有效利用该频谱的无线网络提供了新的机会。这些信道的有利传播特性及其广泛可用性(特别是在农村地区)使它们非常适合在人口稀少的地区提供宽带服务,在这些地区,经济因素阻碍了在许可频谱上部署此类服务。在这种情况下,本文探讨了在TVWS信道中运行的室外Wi-Fi类网络的部署,通常称为超级Wi-Fi网络。由于管理这些信道的未许可使用的法规允许(a)安装高达30 m的高度的固定设备并且以高达4 W EIRP的发射功率操作,以及(b)对于便携式设备以高达100 mW EIRP的发射功率操作,因此这样的网络可以提供比传统Wi-Fi网络更大的覆盖范围和更高的速率。然而,这些增益受制于从便携式设备(客户端)到固定设备(接入点(AP))的上行链路的可行性,因为与AP相比,对客户端的发射功率的限制更严格。本文利用随机几何的概念来研究这种网络的性能,具体关注(a)AP和客户端之间的发射功率不对称及其对上行链路可行性和覆盖范围的影响,以及(b)AP的高度和发射功率之间的相互作用,以确定网络吞吐量。这样的分析揭示了(a)即使当AP部署在30 m高度时,也获得不超过700 m的最大覆盖,以及(b)当速率优先于覆盖时,以超过1 W的发射功率操作AP仅在稀疏部署密度下是有益的。

英文摘要:

Recent regulatory changes proposed by the Federal Communications Commission (FCC) permitting unlicensed use of television white space (TVWS) channels present new opportunities for designing wireless networks that make efficient use of this spectrum. The favorable propagation characteristics of these channels and their widespread availability, especially in rural areas, make them well-suited for providing broadband services in sparsely populated regions where economic factors hinder deployment of such services on licensed spectrum. In this context, this paper explores the deployment of an outdoor Wi-Fi-like network operating in TVWS channels, referred to commonly as a Super Wi-Fi network. Since regulations governing unlicensed use of these channels allow (a) mounting fixed devices up to a height of 30 m and operation at transmit powers of up to 4 W EIRP, and (b) operation at transmit powers of up to 100 mW EIRP for portable devices, such networks can provide extended coverage and higher rates than traditional Wi-Fi networks. However, these gains are subject to the viability of the uplink from the portable devices (clients) to the fixed devices (access points (AP)) because of tighter restrictions on transmit power of clients compared to APs. This paper leverages concepts from stochastic geometry to study the performance of such networks with specific focus on the effect of (a) transmit power asymmetry between APs and clients and its impact on uplink viability and coverage, and (b) the interplay between height and transmit power of APs in determining the network throughput. Such an analysis reveals that (a) maximum coverage of no more than 700 m is obtained even when APs are deployed at 30 m height, and (b) operating APs at transmit power of more than 1 W is beneficial only at sparse deployment densities when rate is prioritized over coverage.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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