# Priority-Driven Resource Allocation with Reuse for Platooning in 5G Vehicular Network
## 5 Results and Analysis
### Simulation Results and Analysis
The simulation results show that with one platoon, the Max-C/I algorithm, the priority-based reuse algorithm, and the proposed algorithm all recorded delay times between 35 and 36 ms. In contrast, the priority-based algorithm exhibited a higher delay time of 39 ms, as general vehicles were deprioritized in resource allocation compared with platoon vehicles, leading to delays. Both the proposed algorithm and the priority-based reuse algorithm handled platoon vehicle communication first while allowing general vehicles to reuse resources, thereby mitigating delays caused by resource shortages. The Max-C/I algorithm, which allocates resources based on the communication status of the vehicle, did not deprioritize general vehicles over platoon vehicles, thus maintaining a similar delay time. The proposed algorithm consistently maintained stable delay times regardless of the number of platoons, recording a delay of 36 ms even when there were three platoons. In contrast, the priority-based algorithm and the priority-based reuse algorithm saw slight increases in delay times, reaching 41 ms and 39 ms, respectively, under the same conditions. The Max-C/I algorithm recorded a delay of 40 ms. As the number of platoon vehicles increased, the priority-based reuse algorithm experienced resource shortages, making it more difficult to reuse resources among general vehicles, which resulted in increased delay  
Figure 10: The average end-to-end delay of general vehicle. times. This was due to the growing demand for resources from the increasing number of platoon vehicles, which reduced the resources available for general vehicles. The reuse algorithm could not fully resolve the resource shortage, resulting in additional delays. On the other hand, the proposed algorithm can reuse platoon vehicle resources within the range that maintains the required SINR threshold, effectively minimizing the resource shortage issue for general vehicles by prioritizing vehicles that have not been allocated resources. When there were five platoons, the Max-C/I algorithm recorded a delay of 43 ms, the priority-based algorithm recorded 45 ms, and the priority-based reuse algorithm recorded 41 ms, while the proposed algorithm maintained a nearly constant delay time of 37 ms even as the number of platoons increased. These results demonstrate that the proposed algorithm can reliably ensure the communication performance of general vehicles, even as the number of platoons increases. Through efficient resource reuse, the proposed algorithm contributed to keeping the average delay time of general vehicles stable, even in congested environments. (3) Delay of platoon vehicles: Figure 11 presents the average delay times for platoon vehicles in the proposed algorithm compared with other algorithms in a congested environment with 60 general vehicles. According to the analysis, the priority-based algorithm, priority-based reuse algorithm, and the proposed algorithm all maintained an average delay time of 16 ms across scenarios with one to three platoons. However, the Max-C/I algorithm exhibited an increasing delay as the number of general vehicles rose, with delay times reaching 20 ms with one platoon, 24 ms with three platoons, and 30 ms with five platoons when there were 60 general vehicles. This delayed increase in the Max-C/I algorithm is attributed to the undifferentiated resource allocation between general and platoon vehicles, causing delays in the resource allocation process for platoon vehicles. Therefore, in the MAX-C/I algorithm, the communication delay increases as the number of platoons increases. The priority-based algorithms and priority-based reuse algorithms recorded delays of 19 ms and 17 ms, respectively, on 60 general vehicles with four platoons, and delays began to increase. Then, in the five platoons, they recorded delays of 22 ms and 20 ms.  
Figure 11: The average end-to-end delay of platoon vehicle.