Efficient Routing Strategy for Congestion Avoidance in MANETs

Abstract

Mobile Ad-hoc Networks (MANETs) consists of different wireless nodes that can move in a random fashion with the capability to join or leave the network anytime. MANETs can be used in disaster and relief, mobile surveillance and military operations. During information exchange, a large number of messages are transmitted that can cause congestion to block the transmission of emergency messages. Congestion avoidance is a challenging issue due to mobility and hence dynamic topology of MANETs. In this paper we present an AODV based mechanism to avoid congestion before happening. In proposed scheme, the current bandwidth consumption is estimated to adjust according to available bandwidth. Feedback is provided to source node about current network state according to which source node adjust its data rate. We have simulated the scenario by using NS 2.35 using TCL and C language. Results are extracted from trace files using Perl scripts. Our schemes proves the dominance over preliminaries in terms of packet delivery ratio and throughput.