ENHANCING TRANSMISSION CONTROL PROTOCOL (TCP) FOR MANET: A STUDY OF FEDERAL UNIVERSITY OF TECHNOLOGY (FUTO)
Publication Date : 15/03/2018
Transmission control protocol (TCP) was not originally designed for use in mobile ad hoc network (MANET) environment but for wired network. Transport layer issues such as link failure, network congestion and wireless channel error, degrade TCP performance in wireless networks including MANET. Mobile ad hoc network in Federal University of Technology, Owerri (FUTO) only covers three departments with AODV routing protocol and Tahoa, using one node each for the three departments. There is need to increase the coverage to eight departments and since increase in number of nodes decreases throughput, developing a model for improving TCP performance is required to achieve an efficient design and deployment of MANET to cover the eight (8) departments. In this work, Three different routing protocols; Temporally ordered routing algorithm (TORA), Dynamic source routing (DSR) and Ad hoc on demand distance vector (AODV) were evaluated with three different TCP variants (Tahoe, Reno and New Reno) using traffic of three different packet sizes, 512, 1000, 1500 bytes each, all of them being tested in three different scenarios having 3, 5 and 8 nodes (3, 5 and 8 departments). The goal of this study is to determine which TCP variant and routing protocol provides the best performance with regards to throughput and multiple data recovery when there is increase in number of nodes. The performance parameters on the basis of which routing protocols were graded were mainly throughput, congestion window and delay. Simulation showed that when the number of nodes were increased (from 3 to 8) AODV provided better throughput performance than DSR and TORA, (AODV=575MB, DSR=320 and TORA=160MB all at 10secs) and when AODV was used with New Reno it offered better multiple data recovery than when used with Tahoe and Reno. Therefore, AODV and New Reno are best suited for MANET enhancement in FUTO. I went further developing another AODV routing protocol called New AODV (NE-AODV) with ns-2 simulator to enhance the effect of the selected New Reno TCP.
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