DOI: 10.5061/dryad.zs7h44jnt
title: Data from: Modeling and analysis of 5G-A channel characteristics in underground environments using a novel CRCB-FDTD method

description: The advancement of intelligent mining and industrial digital
 transformation relies heavily on robust wireless communication systems in
 underground mines. To enable scientifically sound network planning, this
 study proposes a finite difference time domain (FDTD) approach with a
 conformal grid for roadway curved boundaries (CRCB-FDTD) method for
 high-precision wireless channel modeling in complex mine environments. The
 model addresses the critical challenge of accurately simulating wave
 propagation in curved roadway structures through an optimized conformal
 grid approach. Field measurements collected from operational coal mines
 validate the model's performance, demonstrating a mean error
 reduction of 1.2 dB compared to the conventional FDTD and 0.5 dB compared
 to the equivalent cross-sectional area-based FDTD (ECSA-FDTD), while
 maintaining computational efficiency. A key finding reveals asymmetric
 channel characteristics in branch roadways, where path loss significantly
 increases when transmitters are placed in the main roadways. This
 phenomenon arises from the wave-guide effect in the main roadways and
 variations in directional energy coupling. The results deliver significant
 practical contributions, providing a computationally efficient modeling
 framework for precise path loss prediction in curved mine roadways, along
 with fundamental insights for optimizing base station placement and
 antenna configurations to mitigate coverage asymmetry.
description: # Data from: Modeling and analysis of 5G-A channel characteristics in
 underground environments using a novel CRCB-FDTD method Dataset DOI:
 [10.5061/dryad.zs7h44jnt](10.5061/dryad.zs7h44jnt) ## Description of the
 data and file structure Wireless propagation tests were conducted in three
 types of mine roadways: straight, curved, and branched. The straight
 roadway, which is a line-of-sight (LOS) propagation scenario, has an
 arched cross-section with a width of 5.6 m and a height of 4.6 m, and the
 test section is 410 m long, and the measured data are presented in Sheet1.
 Compared to LOS propagation scenarios, non-line-of-sight (NLOS)
 propagation scenarios in underground mines exhibit stronger signal
 fluctuations and a higher risk of signal blind spots, which significantly
 affect communication performance. To address this, field measurements were
 conducted in curved and branched roadways to characterize and model
 typical NLOS propagation behaviors. The curved roadway represents a
 non-line-of-sight (NLOS) propagation scenario, featuring an arched
 cross-section with a width of 5.5 m, a height of 4.1 m, and a turning
 angle of 66°. The tested segment has a length of 40 m, and the measured
 data are presented in Sheet3. The branched roadway represents a
 non-line-of-sight (NLOS) propagation scenario, featuring an arched
 cross-section with a width of 5.5 m and a height of 4.1 m. The branch
 forms a right-angled T-junction, and the tested segment has a length of 40
 m, and the measured data are presented in Sheet4. The testing equipment
 comprised a portable signal generator (Aaronia BPSG6), a portable
 real-time spectrum analyzer (Aaronia V6-RSA250X), two logarithmic periodic
 antennas (Kirisun TN306), two short coaxial cables, two adjustable
 tripods, and two laptop computers. ### Files and variables #### File:
 path_loss.xlsx **Description:**  ##### Variables * distance (m) *
 frequency (MHz) ## Code/software Any program that will open a spreadsheet,
 such as Excel is recommended.