# Multi-Technology Multi-Operator Site Sharing: Compliance Distance Analysis for EMF Exposure
## 4 Results and Discussion
### Shared Indoor IBS Site
\begin{table}
\begin{tabular}{c c c c c c c} \hline
**Site Setting** & **2G G900** & **3G U900** & **4G L800** & **4G L1800** & **4G L2100** & **5G N3600** \\ \hline Freq. Band (MHz) & 900 & 900 & 800 & 1800 & 2100 & 3500 \\ Freq. BW (MHz) & 5 & 5 & 10 & 20 & 20 & 100 \\ Total Tx & 2 & 1 & 2 & 2 & 2 & 4 \\ Total Rx & 2 & 1 & 2 & 2 & 2 & 4 \\ Power Tx & 1.3 W & 1.3 W & 1.3 W & 1.3 W & 1.3 W & 2 W \\ System Load & 95\% & 95\% & 95\% & 95\% & 95\% & 95\% \\ Ant. Gain & 8 dBi & 8 dBi & 8 dBi & 10 dBi & 10 dBi & 11.1 dBi \\ \hline \end{tabular}
\end{table} 
Table 4: Configuration setup for shared indoor IBS. Figure 11: The R\({}_{\text{CD}}\) for shared IBS-DAS site, referencing the ICNIRP and FCC limits for GP. With reference to the ICNIP for the GP, Figure 13 displays the exposure ratio for each technology calculated using Equation (4) in the horizontal direction and the total TER for the IBS site shared by a single MNO, two MNOs, three MNOs, and four MNOs. The results showed that 5G N3500 MHz had the highest contribution to the TER at the compliance distances for the ICNIRP with a contribution of 26%, followed by 4G L800 with 20%, 2G G900 and 3G U900 with 18% each, 4G L1800 with 9%, and 4G L2100 with 8%. Similarly, the N3500 had the highest contribution (30%), followed by 4G L800 (18%), 2G G900 and 3G U900 (16% each), and 4G L1800 and 4G L2100 (both with 10%). Figure 14 summarizes the exposure contributions of each technology at the R\({}_{\rm CD}\), and these were the expected results because the IBS site does not use a high grade of mMIMO. Figure 12: The PD (W/m\({}^{2}\)) from the antenna for the shared IBS-DAS site. Figure 13: The exposure ratio at the main direction for multi-technology IBS site, referencing ICNIRP limits for GP. Similar to that of the shared macro site, with an increase in the number of MNOs, the R\({}_{\text{CD}}\) of the IBS increased with the same percentage for all references. Table 5 summarizes the percentage of the distance increase compared with a single MNO with reference to the ICNIRP and FCC limits. It shows an increase of +41% for two MNOs, +73% for three MNOs, and 100% for four MNOs. Additionally, in practice, it is difficult to find groups of MNO operators that share IBS sites with the same configurations. However, using Table 4 as the input, Equation (9) was used to scale up the increase in R\({}_{\text{CD}}\) with the increased N of MNOs sharing the IBS, as shown in Figure 15.  
Figure 14: The EMF radiation contribution from each technology at CD for shared IBS site, referencing ICNIRP and FCC limits for GP and OW. Figure 15: The R\({}_{\text{CD}}\) increment at IBS site shared by N number of MNOs using the typical RF configuration in Table 4. \begin{table}
\begin{tabular}{c c c c c c c} \hline \hline \multirow{2}{*}{**Limits**} & \multicolumn{6}{c}{**Compliance Distance (m)**} \\ \cline{2-7}  & **1 MNO** & **2 xMNO** & **\%** & **3 xMNO** & **\%** & **4 xMNO** & **\%** \\ \hline
**INCIRP** & 0.9 & 1.2 & +41\% & 1.5 & +73\% & 1.7 & +100\% \\
**FCC** & 0.8 & 1.1 & +41\% & 1.4 & +73\% & 1.6 & +100\% \\
**INCIRP** & 0.4 & 0.6 & +41\% & 0.7 & +73\% & 0.8 & +100\% \\
**FCC** & 0.4 & 0.5 & +41\% & 0.6 & +73\% & 0.7 & +100\% \\
**INCIRP** & 0.4 & 0.6 & +41\% & 0.7 & +73\% & 0.8 & +100\% \\
**FCC** & 0.4 & 0.5 & +41\% & 0.6 & +73\% & 0.7 & +100\% \\
**INCIRP** & 0.2 & 0.3 & +41\% & 0.3 & +73\% & 0.4 & +100\% \\
**FCC** & 0.2 & 0.2 & +41\% & 0.3 & +73\% & 0.3 & +100\% \\ \hline \hline \end{tabular}
\end{table} 
Table 5: DC for IBS site shared by up to 4 MNOs, referencing the ICNIRP and FCC limits.