Abstract: Mobile Ad-hoc Networks (MANET) are self-organizing and self-configuring multihop wireless networks where the structure of the network changes dynamically. This is mainly due to the mobility of nodes. The nodes in the network not only acts as hosts but also as routers that route data to or from other nodes in network. In mobile ad-hoc networks, a routing procedure is always needed to find a path so as to forward the packets appropriately between the source and the destination. In a MANET, temporary link failures and route changes occur frequently. With the assumption that all packet losses are due to congestion, TCP performs poorly in such an environment. This study proposes a new mechanism called TASR, TCP-aware source routing which can improve TCP performance in wireless Ad-hoc networks. TASR adds a hold state to an existing routing protocol to reduce consecutive timeouts, retransmissions and out-of-ordered packets in TCP. In the simulation study, TASR achieves up to a 60% improvement in performance without requiring any TCP stacks in end systems to be modified.
S. Kannan, S. Karthik and V.P. Arunachalam, 2011. An Enhanced Packet Retransmission Method for Improving TCP-Aware Source Routing in Mobile Ad-Hoc Network. Asian Journal of Information Technology, 10: 20-25.