# Research on Communication Stability of Inter-Cannonball Network Based on OPNET
## 5 Results and Discussion  
Due to the high mobility of ad hoc nodes and the damage that will occur as time advances, the ad hoc network needs to perform new route discovery during data transmission to ensure smooth communication lines. By studying the effects of damage and movement of nodes on routing and network communication, we can determine the interference resistance of inter-cannonball self-organizing networks. The delay within 100 ms has little impact on the self-organizing communication system, so when the node failure rate reaches 20%, the delay still does not exceed 100 ms, and it means that the communication network stability meets the requirements. Simulation scenarios were used to compare the impact of node shift speed and error rate on the communication network. In order to explore the effect of the node failure rate of the communication network on the communication stability, Figure 10 shows the simulation comparison before and after the node failure of the inter-cannonball self-organizing network. To improve the efficiency of simulation, we collect the average value of simulation data over a period of time. The blue curve is the simulation result when there is no failure, from which we can see that the data is smooth at this time, the communication is stable, and the wireless LAN delay is kept below 10 ms after the stable route is established. The red curve shows the simulation results when the failure occurs within the specified time, and the node damage rate reaches 10% and 20% at 10 and 20 min, respectively. As the node failure rate rises, route hops, route discovery time, and wireless LAN delay rise, while system throughput drops. The increase in the number of hops per route and route discovery time is because AODV initiates routes on demand, so it needs to bypass the damaged nodes to find routes again. According to Equation (8), the wireless LAN delay will become larger due to the increase in the data transmission distance, while the decrease in the number of nodes will reduce the overall throughput of the system. In Figure 10, the offset of the red curve relative to the blue curve is greater between 20 and 30 min than that between 10 and 20 min. The impact of a node failure rate of 20% is greater than that of a node failure rate of 10%. It represents that the communication network is more severely harmed, and communication must bypass a large number of failed nodes. Figure 11 depicts the results of a comparison and study of the difference between the communication indices at three different moving speeds. Considering that the different moving speeds of the cannonball nodes may affect the effectiveness and reliability of the communication system, we compared and studied the difference between the communication indices at three different shift speeds. To better compare trends, the gathered data are averaged, and the pictures are divided into global plots on the left and local plots on the right. Comparing the system's properties at the three node movement speeds reveals that as node movement speed rises, the average route-finding time grows until it is about the same. This suggests that the quicker the nodes move, the longer it takes to construct a stable route, but that it has less influence on the stability of the communication after the route has been established. Figure 11: Effect of different speeds on communication stability. (**a**) number of hops per route, (**b**) local enlargement of a, (**c**) route discovery time, (**d**) local enlargement of c.  
Figure 10: Comparative simulation data before and after node failure in terms of (**a**) number of hops per route, (**b**) route discovery time, (**c**) throughput, (**d**) wireless LAN delay. Figure 12 shows the simulation results of nodes moving at 90 km/h and having failed nodes at the specified time, where the node reaches 10% failure rate at 10 min and 20% failure rate at 20 min. Compared to 10 min, the increase in the number of hops per route, route discovery time, and wireless LAN delay is greater at 20 min.