# Smart Bandwidth Assignation in an Underlay Cellular Network for Internet of Vehicles
## 5 Proposed Solution Tests and Validation
### Simulation Results
\begin{table}
\begin{tabular}{c c c c} \hline \hline
**CUE’s Message** & **Underlay V2V** & **Our Approach V2V** & **Overlay V2V** \\
**Size (Bytes)** & **Throughput (Gbps)** & **Throughput (Gbps)** & **Throughput (Gbps)** \\ \hline
100 & 1.9798 & 2.2196 & 1.9911 \\
200 & 1.9681 & 2.2081 & 1.9744 \\
300 & 1.9684 & 2.1794 & 1.9757 \\
400 & 1.9676 & 2.1745 & 1.9801 \\
500 & 1.9650 & 2.1674 & 1.9820 \\
600 & 1.9635 & 2.1700 & 1.9746 \\
700 & 1.9556 & 2.1634 & 1.9600 \\
800 & 1.9498 & 2.1617 & 1.9623 \\
900 & 1.9636 & 2.1783 & 1.9613 \\
1000 & 1.9586 & 2.1671 & 1.9548 \\
1100 & 1.9558 & 2.1698 & 1.9579 \\
1200 & 1.9491 & 2.1673 & 1.9521 \\
1300 & 1.9542 & 2.1688 & 1.9526 \\
1400 & 1.9489 & 2.1670 & 1.9546 \\
1500 & 1.9474 & 2.1652 & 1.9456 \\ Media & 1.9597 & 2.1752 & 1.9653 \\ \hline \hline \end{tabular}
\end{table} 
Table 3: Average Throughput offered to V-UEs based on C-UEs’ traffic pattern. Figure 5: Throughput offered to V-UEs based on C-UEs’ traffic pattern. (**a**) Total Average Throughput in different scenarios; (**b**) Total Average Throughput for all set of users. Figure 6a shows that the maximum value of spectral efficiency delivered by the proposed RRM solution is achieved at the Scenario 1, where the number of V-UEs is the highest one (45) and the number of C-UEs is the lowest one (5). This proves that the proposed methodology performs better when the number of V-UEs is high, which demonstrate this solution is focused on increasing the spectral efficiency of V2V links. In addition, Figure 6b reveals that the average spectral efficiency offered by the RRM methodology proposed in this paper is higher than the methodologies which it is compared to. Table 5 sums up these average values of V2V spectral efficiency represented in Figure 6b, and shows that the total average spectral efficiency of V2V communications reaches its highest value with the presented RRM. In addition, Table 5 reveals that the maximum value of spectral efficiency for V2V links is accomplished when the C-UEs' message size is 100 bytes using the RRM presented in this paper. In other words, while the C-UEs's packet size increases, the spectral efficiency of V2V links decreases. However, this does not happen in the overlay RRM solution since it assigns individual RBs to each transmission which makes it independent of the rest of the users' transmissions. To end up with the spectral efficiency analysis, Figure 7 presents the total spectral efficiency of the solutions evaluated. In this way, Figure 7a shows the total spectral efficiency results obtained in the different scenarios and, Figure 7b reveals the total average results for the set of users. \begin{table}
\begin{tabular}{c c c c} \hline
**CUE’s Message** & **Underlay Total** & **Our Approach Total** & **Overlay Total** \\
**Size (Bytes)** & **Throughput (Gbps)** & **Throughput (Gbps)** & **Throughput (Gbps)** \\ \hline
100 & 2.6870 & 2.9351 & 2.6186 \\
200 & 3.0729 & 3.3967 & 2.8166 \\
300 & 3.3820 & 3.7943 & 3.0143 \\
400 & 3.6363 & 4.1614 & 3.1914 \\
500 & 3.8890 & 4.5104 & 3.3809 \\
600 & 4.1432 & 4.8688 & 3.5563 \\
700 & 4.3750 & 5.2224 & 3.7543 \\
800 & 4.5923 & 5.5784 & 3.9307 \\
900 & 4.8477 & 5.9575 & 4.1163 \\
1000 & 5.0782 & 6.3053 & 4.3020 \\
1100 & 5.2871 & 6.6725 & 4.4930 \\
1200 & 5.5013 & 7.0332 & 4.7124 \\
1300 & 5.7040 & 7.3952 & 4.8591 \\
1400 & 5.8899 & 7.7527 & 5.0409 \\
1500 & 6.0869 & 8.1100 & 5.2257 \\ Media & 4.5448 & 5.5796 & 3.9342 \\ \hline \end{tabular}
\end{table} 
Table 4: Average Total Throughput achieved based on C-UEs’ traffic pattern. Figure 6: Spectral Efficiency offered to V-UEs based on C-UEs’ traffic pattern. (**a**) Total Average Spectral Efficiency for V-UEs in different scenarios; (**b**) Total Average Spectral Efficiency for V-UEs. Figure 7a shows that the proposed RRM reaches its maximum spectral efficiency value at Scenario 5, where 25 C-UEs and 25 V-UEs coexist. This fact evidences that our aim is to minimize the number of RBs used, or in other words, maximize the number of pairs which is easier when there is the same number of C-UEs and V-UEs.