Adaptive Link Timeout with Energy Aware Mechanism for On-demand Routing in Manets

Mobile Ad Hoc Networks (MANETs) are multi-hop wireless networks where all nodes cooperatively maintain network connectivity. When the size of the network is large and the nodes are highly mobile, the frequency of link failure and energy consumption of the nodes will be more. Link failure will be identified only during the transmission of data packets. Due to this, control load of the network will increase. To overcome this problem, in this paper, an innovative algorithm is suggested to remove the stale paths after a certain timeout period which is made adaptive by taking hop count of the path into consideration. To minimize the power consumption of the entire network, in this paper, an energy aware approach is proposed for on-demand protocols. Energy aware approach is a two-pronged strategy consisting of load balancing approach and transmission power control approach. In this paper, we propose a mechanism which integrates the adaptive timeout approach, load balancing approach and transmit power control approach to improve the performance of on-demand routing. We applied this integrated mechanism on Ad hoc Ondemand Distance Vector(AODV) routing protocol to make it as Energy Aware Adaptive AODV (EAA AODV) routing protocol. The performance of EAA AODV is also compared with that of standard AODV with the help of simulations carried out using GloMoSim simulator. From simulation results it is learnt that EAA AODV decreases the number of control packets, increases the packet delivery ratio and reduces power consumption.