# Experimental Study on LTE Mobile Network Performance Parameters for Controlled Drone Flights
## 5 Evaluation and Analysis of Measured Results  
When focusing on the flights carried out in location \"Lode\", it is possible to reach conclusions about the conjunction between certain parameters. Firstly, the conjunction between RSRQ and the other parameters was analyzed. RSRQ is one of the key metrics when it comes to assessing performance quality in mobile networks. The KPI before the measurement for RSRQ was set at \(-16\) dB. If, during the measurement period, the value of RSRQ was consistently below this threshold, then it would be concluded that the area measured had poor signal. To test whether this threshold was adequate, the data where the RSRQ values were fluctuating around this threshold value was summarized into three categories. Data where RSRQ were between \(-14\) and \(-16\) dB, between \(-16\) and \(-18\) dB, and between \(-18\) and \(-20\) dB. This was carried out to see how other metrics performed if signal quality were to drop below the KPI. The other metrics were compared against their own set thresholds to see how they performed when RSRQ was recorded before the described ranges. The thresholds for other metrics were as mentioned before. RSRP: \(-100\) dBm; SINR: \(-5\) dB; downlink: 4096 kbps; uplink: 4096 kbps; ping: 50 ms. In Table 5, these measurements are shown for the test site Lode at measurement heights of 40, 60, 90, and 110 m. Percentages of values above the threshold are market in range: 95-100% (dark green); 94-85% (green); 84-75% (beige); <74% (pinkish). Table 5 shows that when looking at network parameters, the difference between the percentage of values above the RSRQ threshold, between the ranges of \(-14\) to \(-16\) dB and \(-16\) to \(-18\) dB is relatively small, meaning that even at a lower quality connection, it is possible to provide consistent network speeds and ping. It is worth mentioning that in some of the flights, it would seem that lower RSRQ yielded even better network parameters, for example, as was visible with ping at 40 m height. This is because RSRQ rarely fell into the range of \(-18\) to \(-20\) dB, as the handover of UE between base stations occurred shortly after RSRQ dropped and so this range had a relatively small dataset. The conjunction between RSRQ and RSRP in the range of \(-16\) to \(-18\) dB is shown in Figure 5.  
As shown in Figure 5 and also Table 5 above, it shows that even when the value of RSRQ is below the threshold, the RSRP value is adequate, meaning above \(-100\) dBm. The only exception is the flight at 40 m, but that is due to tree interference on signal power at lower altitudes. The following Figure 6 shows the conjunction between RSRQ and SINR in the RSRQ range of \(-16\) to \(-18\) dB. Figure 6 shows that SINR values suffer slightly when RSRQ is at a lower range but in Table 5, it was visible that downlink, uplink, and ping values stayed stable regardless. The following Figure 7 shows the average value of RSRQ for every 50 m of flight. As shown in Figure 7, during the flight, the RSRQ values fluctuated significantly and were often below the set KPI of \(-16\) dB, but even with RSRQ falling below the set threshold, other parameters did not suffer high losses. \begin{table}
\begin{tabular}{c c c c c c c c c c c c c c c c c c c} \hline \hline \multicolumn{2}{c}{**RSRQ**} & \multicolumn{2}{c}{**RSRP, \%**} & \multicolumn{4}{c}{**SINR, \%**} & \multicolumn{4}{c}{**Downlink, \%**} & \multicolumn{4}{c}{**Uplink, \%**} & \multicolumn{4}{c}{**Ping.