Efficient Routing and Congestion Control in Multi-Flow MANET Environment

The congestion control within the TCP (Transmission Control Protocol) plays a critical role in amending data rate to evade congestion from happening possibilities. Based on TCP communication sender not only guarantees the successful packet delivery, but also maintains the correct sequence of packets by receiving the frequent acknowledgement from the receiver. In this research we proposed a congestion control scheme with modified TCP and queue length variation with OLSR routing protocol in MANET. The TCP protocol performance is modified by forwarding busy channel signals to predecessor nodes through intermediate nodes in network. The congestion is controlled by that novel method of detecting the node is busy or ready for communication. If the communication is start in network and the possibility if congestion is arise, then in that case the queue length is handle the possibility of congestion. The congestion is minimized due to awaring about the channel busy status and nodes buffer status or queue status. The TCP protocol is able to handle the congestion situation but i.e. completely based on acknowledgement of receiver and also not very effective to control it. The proposed TCP congestion control OLSR routing is improves the network performance by reducing packet loss. The performance of network is measure through performance metrics like throughput, PDF and Routing overhead in different node density scenarios. The performance of proposed scheme is provides the better results.