Analyzing Different Performance Metrics on TCP Varients over Mobile Ad-Hoc Networks

Abstract-Wireless communication is an ever-developing field and the future holds many possibilities in this area. From the early radio and telephone to current devices such as mobile phones and laptops, accessing the global network has become the most essential and indispensable part of every one’s lifestyle. Dominant means of supporting such communication capabilities is through the use of wireless LANs. As the deployment of wireless LANs increases around the globe, it is important to understand the different technologies and select the most appropriate one. A Mobile Ad hoc Network (MANET) is a dynamic multi-hop wireless network that is established by a group of mobile stations without necessarily using pre-existing infrastructure or centralized administration. It can be easily deployed which makes it very attractive for civilian and military applications. It is an infrastructure less network where self-configuring mobile nodes are connected by wireless links. Because of its decentralized property, these nodes relay on each other to store and forward packets. These are characterized by bandwidth constrained links, varying link qualities, and highly dynamic topologies. In the proposed work, TCP sender side mechanisms and appropriate queue management algorithm to handle higher offered load, random losses and retransmission timeouts in high delay networks in such a way as to keep congestion window as high as possible, while keeping the congestion under control and keep retransmissions to minimal. The TCP proposed mechanisms are assessed against TCP RENO, New RENO, TCP VEGAS and Active queue management algorithm to see how they fare against congestion and higher offered load