# Practical Performance Analyses of 5G Sharing Voice Solution
## 5 Performance Analysis
### NSA Sharing VoLTE Performance Analysis  
We conducted access tests for different types of UEs under the two solutions in Section 4.1 separately. The test results are as follows. * VoLTE Bearing in The Respective Home 4G Cell  
In the sharer 5G UE-sharer 5G UE call scenario, sharer 5G UE resided on the sharer anchor frequency point 575, PCI 103, and initiated VoLTE request. After establishing bearer with QCI of 1, triggers switched to the VoLTE-dedicated frequency point 1506. VoLTE was successfully established, as shown in Figure 10. \begin{table}
\begin{tabular}{c c c c c} \hline \hline
**Carrier** & **Band** & **Band** & **PLMN** & **Central Frequency Point** & **Type** \\ \hline \multirow{2}{*}{2.1 GHz Anchor} & 20 M & B1 & 46,011 & 2120 MHz & Operator-A-Dedicated Anchor \\ \cline{2-5}  & 10 M & B1 & 46,001 & 2160 MHz & Operator-B-Dedicated Anchor \\ \hline Operator A 1.8 GHz & 15 M & B3 & 46,011 & 1867.5 MHz & Operator A 4G \\ \hline Operator B 1.8 GHz & 20 M & B3 & 46,001 & 1850 MHz & Operator B 4G \\ \hline Operator A 3.5 GHz & 100 M & N78 & 46,011; 46,001 & 3450 MHz & 5G Sharing Carrier \\ \hline \hline \end{tabular}
\end{table} 
Table 2: Carrier Configuration. Figure 10: Sharer VoLTE setup. In the contractor-contractor 5G UE call scenario, like the sharer 5G UE-sharer 5G UE call scenario, the contractor UE switched from anchor frequency 100 to VoLTE-dedicated frequency 1825. * VoLTE Bearing in The Contractor 4G Shared Anchor Cell  
In the sharer 5G UE-sharer 5G UE call scenario, the sharer 5G UE resided on anchor frequency 575 to initiate VoLTE and established the QCI1 bearer. VoLTE setup to release was completed at anchor frequency 575, as shown in Figure 11.  
In the contractor-contractor 5G UE call scenario, from service setup to release, it was also always done at the anchor 100 frequency point. It can be seen that the actual process is consistent with Section 4.1. This shows that both solutions are technically achievable. VoLTE bearing in the contractor 4G shared anchor cell solution has the advantage of eliminating the time delay caused by handover. Since there is one more handover process in the VoLTE setup process in the return to the home frequency point scheme, we conducted experiments on this. We compared the average call setup delay of the sharer NSA UE returning the specified frequency point and not returning the specified frequency point, and the results are shown in Figure 12.  
In Figure 12, C5G/C4G means contractor 5G/4G, and S5G/S4G means shared 5G/4G. It can be seen that various combinations of VoLTE call setup delay are within 2.9 s. The  
Figure 11: Sharer 5G VoLTE setup. Figure 12: NSA sharing VoLTE test results. delay of the back-to-home solution 5G-5G call as sharer is around 2228 ms, and the delay of the non-back-to-home solution is around 2161 ms regardless of operator A or B. The overall VoLTE setup delay of back to home is about 68 ms longer than not returning. Figure 13 shows that the single-end handover brings 35 ms, and both NSA UEs need 70 ms for handover, which is the same as the actual delay difference. The VoLTE call setup delay for 5G NSA UE to 4G LTE UE is around 2.2 s. The VoLTE call setup delay for 4G LTE UE to 4G LTE UE is around 2.8 s. 5G to 4G delay is better than 4G to 4G, as the wireless side does not bring too much delay due to the different wireless node networking. The VoLTE call setup delay of the contractor 5G NSA UE to the contractor 4G LTE UE back-to-home solution is better than that of the non-back-to-home solution, with an average difference of 35 ms. This is because the 5G NSA UE of the contractor in the back-to-home network scenario needs to experience one additional handover. Similarly, for the VoLTE call setup delay of 5G NSA UE on the sharer to 4G LTE UE on the sharer, the average value of the two solutions differs by 64 ms, which is because 4/5G UE in the back-to-home network solution needs to experience two additional handovers (both UEs need to handover to the dedicated frequency).