AODV Enhancement Based on the Minimization of Route-Request Packets

Abstract

Abstract.A MANET is a self-configuring network of mobile devices connected by wireless links. Reactive Routing protocols for MANETs flood RREQ control packets to discover and establish route between the sourcedestination pairs. This situation becomes worse and degrades the network performance whenever several connections need to be established simultaneously. This paper proposes a mechanism to minimize the routeestablishment overhead in AODV by controlling the flooding of RREQ packets. In brief, each intermediate node counts the number of RREQ packets flooded by it and if the count exceeds a threshold, stops further flooding. On the other hand, an intermediate node, after getting a RREP packet within reverse-routelifetime reduces the counter value; otherwise the reverse link in its cache is removed along with the reduction of the counter value. The proposed scheme has been simulated using ns-2 and compared with the original AODV and it has been found that it enhances network performance.

Mobility-prediction and energy optimization for multi-channel multi-interface ad hoc networks in the presence of location errors

“…They did the simulation in an environment close to reality by using the Gilbert-Elliot model. To reduce the route-establishment overhead in AODV, the authors of [21,22] attempt to minimize the number of intermediate nodes that participate in the route discovery process. This is achieved by reducing the number of route request (RREQ) depending on the length queue and energy of nodes or count of RREQ (nodes stop transfer the requests if the count of RREQ exceeds a threshold).…”