# Bio-Inspired Dynamic Trust and Congestion-Aware Zone-Based Secured Internet of Drone Things (SIoDT)
## 5 Results and Discussion
### Results and Discussion according to Varying Number of Vehicles  
In this section, the considered parameters such as energy efficiency, packet delivery ratio, routing overhead, end-to-end delay, packet loss, and throughput are analyzed in detail concerning vehicles. The simulation values are shown in Tables 6 and 7. In terms of the number of vehicles, the energy efficiency measured by the pro-posed BDTC-SIOVAs is 95%, and for the earlier works, it is LAKA-IOD (78%), NCAS-IOD (85%), and TPDA-IOV (88%). So, it is understood that the proposed BDTC-SIOVAs achieve 7% to 17% better energy efficiency when compared with the earlier works. According to the number of vehicles, the packet delivery ratio measured by the proposed BDTC-SIOVAs is 96%, and for the earlier works, it is LAKA-IOD (82%), NCAS-IOD (88%), and TPDA-IOV (91%). So, it is understood that the proposed BDTC-SIOVAs achieve 5% to 14% better packet delivery ratio when compared with the earlier works. Both the efficiency and delivery  
Figure 17: Packet Loss based on number of vehicles. Figure 18: Throughput based on number of vehicles. ratio of the proposed BDTC-SIOVTs are high, and this is achieved using the concept of enhanced trust and hybrid optimization with the combination of ACO and GWO. However, the earlier approaches concentrate on either security or optimization, so it is essential to concentrate on both to achieve effective communication. Concerning the number of vehicles, the routing overhead measured by the proposed BDTC-SIOVTs is 1256 packets, and for the earlier works, it is LAKA-IOD (4276 packets), NCAS-IOD (2816 packets), and TPDA-IOV (2576 packets). So, it is understood that the proposed BDTC-SIOVTs produce 1300 packets to 3000 packets lower routing overhead when compared with the earlier works. According to the number of vehicles, the routing end-to-end delay measured by the proposed BDTC-SIOVTs is 153 ms, and for the earlier works, it is LAKA-IOD (346 ms), NCAS-IOD (265 ms), and TPDA-IOV (243 ms). So, it is understood that the proposed BDTC-SIOVTs produce 90 ms to 200 ms lower end-to-end delay when compared with the earlier works. Hence, the LAKA-IOD method provides security under the random oracle model in the IoD environment, and it highly improves the communication and computational cost of the network to achieve better performance, but this lightweight scheme is not highly suitable for a network with huge dynamic mobility. The NCAS-IOD method uses a smooth massage dissemination scheme which is highly concentrated on the network congestion control so that, during the process of deployment and message, the energy consumption and delay are low, but later on during the process of communication, packet loss occurred due to a lack of security in the network. In the TPDA-IOV method, the process of decision making and trust evaluation is mainly concentrated so that it reduces the overhead delay at the initial stage, but there is no optimal solution between the source and the destination that leads to moderate overhead and delay during communication.