An Enhanced Congestion Control Mechanism for Mobile Ad-Hoc Network

The very dynamic nature of mobile ad-hoc network creates great challenges for routing protocols. Transmission control protocol (TCP) provides connection oriented, reliable end to end mechanism. TCP congestion control mechanism is not directly suitable for wireless networks. Many TCP congestion control mechanisms have been presented for improvement. But these schemes are not sufficient in controlling congestion. In this paper, an improved mechanism for TCP congestion control is presented. Proposed scheme calculate sending window after each transmission, according to number of destroyed or corrupted packet. It results in less packet drop in transmission. The comparative study of Enhanced TCP (ETCP) with other TCP variants also presented with variation in speed of node, pause time and number of nodes in network. Implementation and analysis of proposed mechanism generated fewer overheads and improved reliability with small variances of throughput and delay. Implementations and Simulations were performed in QualNet 5.0 simulator.