Improved AODV Routing Protocol to Cope with High Overhead in High Mobility MANETs

Ad-hoc On-demand Distance Vector (AODV) routing protocol is the most popular routing protocol for mobile ad-hoc networks (MANETs). This paper enhances AODV protocol by minimizing its control messages overhead. Enhancements include developing two improved versions of AODV protocol. These two versions use Global Positioning System (GPS) to limit the routing discovery control messages. The first version (AODV-LAR) is a variation of the Location Aided Routing (LAR) protocol. The second version (AODV-Line) limits nodes participating in route discovery between source and destination based on their distance from the line connecting source and destination. We evaluate performance of the two proposed protocols using two simulation scenarios. The simulation was done using JIST/SWANS simulator. The results show that the two proposed protocols outperform the original AODV, where the results show a significant reduction of control overhead and delay compared to the original AODV. Results also show that the delivery ratio in the proposed protocols is comparable to the delivery ratio in the original AODV.