Path-loss modelling in deep-indoor scenarios is a difficult task. On one hand, the theoretical formulae solely dependent on transmitter-receiver distance are too simple; on the other hand, discovering all significant factors affecting the loss of signal power in a given situation may often be infeasible. In this paper, we experimentally investigate the influence of deep-indoor features such as indoor depth, indoor distance and distance to the closest tunnel corridor and the effect on received power using NB-IoT. We describe a measurement campaign performed in a system of long underground tunnels, and we analyse linear regression models involving the engineered features. We show that the current empirical models for NB-IoT signal attenuation are inaccurate in a deep-indoor scenario. We observe that 1) indoor distance and penetration depth do not explain the signal attenuation well and increase the error of the prediction by 2-12 dB using existing models, and 2) a promising feature of average distance to the nearest corridor is identified.
@article{arxiv.2006.00880,
title = {Experimental Evaluation of Empirical NB-IoT Propagation Modelling in a Deep-Indoor Scenario},
author = {Jakob Thrane and Krzysztof Mateusz Malarski and Henrik Lehrmann Christiansen and Sarah Ruepp},
journal= {arXiv preprint arXiv:2006.00880},
year = {2020}
}
Comments
6 pages, 6 figures, submitted to Globecom2020 conference, Selected Areas in Communications Symposium, Track on Internet of Things and Smart Connected Communities