LTE radio measurements above urban rooftops for aerial communications
LTE radio measurements above urban rooftops for aerial communications
复制标题
用于空中通信的城市屋顶上空 LTE 无线电测量
DOI：
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发表时间：
2018
期刊：
影响因子：
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通讯作者：
P. Mogensen
中科院分区：
文献类型：
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作者：
R. Amorim;H. Nguyen;J. Wigard;I. Kovács;T. Sørensen;P. Mogensen
本文主要研究城市地区无人机接入蜂窝网络的空中通信问题。大多数以前基于测量的城市环境频道模型不能扩展到位于屋顶以上高度的用户。另一方面，无人机预计将在极低高度(Vll)空域飞行，高度比以前的空对地模型覆盖的高度低得多。通过现场测量，给出了高达40m的城市航道模型(路径损耗、坡度和阴影)随高度变化的闭合表达式，并与3GPP参考模型和前人的研究结果进行了比较。测量是由安装在建筑升降机上的无线电扫描仪进行的，以测量来自三个不同实时LTE网络(800、1800和2600 MHz)的无线电信号。结果表明，无线电路径净空随着高度的增加而增加。结果，它导致在可检测范围内的小区数目增加，以及在接收器中的服务小区的3分贝内的邻居集合增加，这表明相邻小区在功率域中彼此更接近。
This paper focus on the investigation of aerial communications for drones connected to cellular networks in urban areas. Most of the previous measurement based channel models for urban environments do not extend to users located at heights above rooftops. On the other hand, UAVs are expected to fly at the very low level (VLL) airspace, in heights much lower than those covered by previous air-to-ground models. By means of field measurements, this paper presents height-dependent closed form expressions for the urban channel model (path loss slope and shadowing) extending to heights up to 40 m and compares the observed results with 3GPP reference models and previous studies. Measurements were conducted by a radio scanner attached to a construction-lift to measure the radio signal from three different live LTE networks (800, 1800, and 2600 MHz). Results suggest radio path clearance increases with height. As a consequence, it leads to an increase in number of cells in the detectable range and in the set of neighbors within 3 dB of the serving cell in the receiver, indicating neighbor cells are closer to each other in the power domain.