← 研踪 PaperTrailarXiv:2611.10867 · v1
Missed Interferers in Ray-Traced Radio Maps: A Digital-Twin and Stochastic Geometry Study of Aerial Coverage
首次提交 2026-11-08 01:35
版本更新 2026-11-08 01:35
雷达观测 2026-11-10 11:14
摘要
Ray-traced digital twins are increasingly used to plan where cellular-connected uncrewed aerial vehicles (UAVs) can fly. In this paper, we build a Sionna RT digital twin around Raleigh, NC, with 18,591 buildings and two overlapping sub-1 GHz operator networks, and study the downlink signal-to-interference-plus-noise ratio (SINR) of UAVs at 40-300 m. We show that the Monte Carlo radio-map solver of Sionna RT misses distant line-of-sight (LOS) interferers on aerial planes. With $10^7$ rays per sector and 5 m cells, it therefore underestimates the coverage at low SINR thresholds and overestimates it at high thresholds, by up to 26 percentage points at $\pm$2 dB and 50-100 m. Using a LOS-aware deterministic engine validated with Sionna's path solver, we then develop a stochastic geometry model with strongest-sector association and own-site leakage that matches the engine without fitting. The analysis shows that the interference grows logarithmically with the modeled network radius, so a twin that omits distant LOS sites overestimates the coverage, and that altitude mainly reduces the coverage at high SINR thresholds. Finally, selecting the better of two operators raises the minimum SINR along the best corridor by 1.0-3.9 dB up to 100 m.
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v1 · 2026-11-08 01:35 · 最新观测版本
Missed Interferers in Ray-Traced Radio Maps: A Digital-Twin and Stochastic Geometry Study of Aerial Coverage
Ray-traced digital twins are increasingly used to plan where cellular-connected uncrewed aerial vehicles (UAVs) can fly. In this paper, we build a Sionna RT digital twin around Raleigh, NC, with 18,591 buildings and two overlapping sub-1 GHz operator networks, and study the downlink signal-to-interference-plus-noise ratio (SINR) of UAVs at 40-300 m. We show that the Monte Carlo radio-map solver of Sionna RT misses distant line-of-sight (LOS) interferers on aerial planes. With $10^7$ rays per sector and 5 m cells, it therefore underestimates the coverage at low SINR thresholds and overestimates it at high thresholds, by up to 26 percentage points at $\pm$2 dB and 50-100 m. Using a LOS-aware deterministic engine validated with Sionna's path solver, we then develop a stochastic geometry model with strongest-sector association and own-site leakage that matches the engine without fitting. The analysis shows that the interference grows logarithmically with the modeled network radius, so a twin that omits distant LOS sites overestimates the coverage, and that altitude mainly reduces the coverage at high SINR thresholds. Finally, selecting the better of two operators raises the minimum SINR along the best corridor by 1.0-3.9 dB up to 100 m.
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