Congestion Control Analysis over Wireless Ad hoc Networks

Transmission Control Protocol (TCP), the mostly used transport protocol, performs well over wired networks. As much as wireless network is deployed, TCP should be modified to work for both wired and wireless networks. Since TCP is designed for congestion control in wired networks, it cannot clearly detect noncongestion related packet loss from wireless networks. TCP Congestion control plays the key role to ensure stability of the Internet along with fair and efficient allocation of the bandwidth. So, congestion control is currently a large area of research and concern in the network community. Many congestion control mechanisms are developed and refined by researcher aiming to overcome congestion. During the last decade, several congestion control mechanisms have been proposed to improve TCP congestion control. The purpose of this paper is to analyze and compare the different TCP variants namely Reno, New Reno, Vegas under the AODV routing protocol. TCP’s robustness is as a result of its reactive behaviour in the face of congestion, and fact that reliability is ensured by retransmissions.