RE-AODV: Improved AODV Routing Protocol for Repairing Efficiency

Mobile Ad Hoc Network (MANET) is a selforganized, quickly configurable network, which does not have fixed infrastructure. Mobility is one of the most characteristic in MANET, but it may cause the failure of a valid link. There are two repair mechanisms—local repair and source repair in Ad hoc on demand distance vector protocol (AODV). The source repair mechanisms will bring higher overhead and packet loss ratio. Local Repair is an effective way to rebuild a route to destination, but its performance decline when the destination is unreachable from local repair node. This paper proposes an improved repair mechanism (RE-AODV) based on the local repair scheme, which distinguishes different route request messages and route reply messages with Local_Repair and Dst_Answer flags, and process them with different priorities. The simulation results demonstrate that the network delivery ratio can be significantly improved by using the proposed repair scheme.