Truetime Example (I) - AODV Protocol Implementation and Simulation

In this article, we will explore the working principles of AODV through Example (I) implemented using Truetime 2.0. AODV (Ad-hoc On-demand Distance Vector) is an adaptive wireless network routing protocol designed to address limitations in traditional hop-by-hop wireless routing protocols. Unlike conventional approaches, AODV utilizes Destination Sequence Numbers (DSN) to prevent routing loops and ensure route correctness during network topology changes. The protocol implementation involves maintaining sequence counters for each destination, where nodes only accept routing information with higher sequence numbers, effectively eliminating looping scenarios. Furthermore, AODV demonstrates strong adaptability by dynamically adjusting routing tables based on real-time network conditions, thereby enhancing network performance and stability. The protocol implementation typically includes route discovery mechanisms using Route Request (RREQ) and Route Reply (RREP) packets, along with route maintenance through Route Error (RERR) messages when links break. Using Truetime 2.0, we validate the correctness and reliability of the AODV protocol through simulated network environments. The simulation setup involves creating wireless node models with Truetime's kernel blocks, implementing AODV routing logic in MATLAB/Simulink, and analyzing performance metrics like packet delivery ratio and end-to-end delay. The Truetime implementation allows for real-time simulation of network events, including node mobility patterns and link quality variations, providing insights into AODV's practical applications in real-world network scenarios.