## 3 Simulation Results with ITU-R P.1546-6 Model
The parameters of the base stations are listed in Table 3.  
The simulations were carried out in LStelcom's [36] CHIRplus_BC software 7.5.1.1 [37], which was originally designed for broadcasting networks, but is also open to testing mobile networks via the Other Services menu. The software contains a number of wave propagation models, including ITU-R P.1546-6 and ITU-R P.452-17, but also has a tunable parametric Okumura-Hata model. Figure 5: The test base stations and their related areas and test points. Figure 7 illustrates the terrain conditions within a \(30\times 30\) km area surrounding the investigated base stations, while Figure 8 presents the field strength levels calculated using the ITU-R P.1546-6 model on 3.6 GHz. The calculations were carried out with a 50% probability for both location and time, assuming a receiving antenna height of 10 m. The distribution of terrain heights and calculated field strength values is further visualized in Figures 9 and 10 using box plots and scatter plots. The first test base station is located lower than the surrounding terrain. The test area is evenly distributed between hills and valleys, and the terrain is therefore highly fragmented, with a wide range of altitudes from approximately 100 m to 400 m above sea level. Although the computed field strength levels in the figure show a decreasing trend away from the base station, it can be observed that the values range widely, with a difference between the smallest and the largest value of 81.1 dB. \begin{table}
\begin{tabular}{c c c c} \hline
**Parameters** & **TestBS\_1** & **TestBS\_2** & **TestBS\_3** \\ \hline
**Frequency** & 3.6/6 GHz & 3.6/6 GHz & 3.6/6 GHz \\ \hline
**Coordinates** & 019E06 14/7N26 28 & 020E10 29/46N39 16 & 020E00 30/47N52 19 \\ \hline
**ERP** & 46 dBm & 46 dBm & 46 dBm \\ \hline
**hASL** & 118 m & 80 m & 1008 m \\ \hline
**hantAGL** & 30 m & 30 m & 30 m \\ \hline
**Antenna Gain** & 20.15 dBd & 20.15 dBd & 20.15 dBd \\ \hline
**Hor. Pattern** & Omnidir. & Omnidir. & Omnidir. \\ \hline
**Vert. Beamwidth** & 45\({}^{\circ}\) & 45\({}^{\circ}\) & 45\({}^{\circ}\) \\ \hline \end{tabular}
\end{table} 
Table 3: Simulation parameters for test base stations. Figure 6: Test cases in close-up view, with test points (\(\mathrm{T_{1}-T_{90}}\)) selected within the areas. (**a**) TestBS_1 (\(\mathrm{T_{1}-T_{30}}\)); (**b**) TestBS_2 (\(\mathrm{T_{31}-T_{60}}\)); (**c**) TestBS_3 (\(\mathrm{T_{61}-T_{90}}\)). Figure 7: The terrain profile around the investigated base stations. It can also be observed that, in addition to the decreasing trend, the variation in the terrain is accompanied by a rapid variation in the field strength values, even between points close to each other but with significantly different altitudes. For the second test base station, we consider a flat, minimally variable terrain profile, as shown on the boxplot, where the height values show a slight deviation. In this case, we expect higher field strength level values with a steadily decreasing characteristic as moving away from the base station. This comes from the propagation curves as the basis of the model and is confirmed by the simulation results. The calculated field strength levels also show a significantly smaller range (47.7 dB) compared to the first test case. In the third test case, the examined base station is situated at a significantly higher geographical point than the surrounding terrain. Given optical line of sight between the transmitter and the reception, points are ensured for the majority of the test locations. As a result, the median field strength is the highest among the three cases, as the elevated  
Figure 8: Field strength level values around the investigated base stations (ITU-R P.1546-6). Figure 10: Distribution of terrain heights and field strength levels (ITU-R P.1546-6) as a function of distance. Figure 9: Terrain height distribution and field strength distribution based on ITU-R P.1546-6. position minimizes obstructions and enhances signal propagation.