Effect of Transfer File Size on TCP-ADaLR Performance: A Simulation Study

M. Omueti and L. Trajković (Canada)


Communication networks, TCP, file transfers, propagation delays, simulation, performance evaluation.


Large file transfers have become common with the increasing demand for bandwidth-intensive Internet applications. The transmission control protocol with adaptive delay and loss response algorithm (TCP ADaLR) was proposed to improve TCP performance in the presence of large propagation delays and error losses. In this paper, we analyze the effect of transfer file size on the TCP-ADaLR performance in networks with large propagation delays. We employ the file transport protocol (FTP) file download application to evaluate TCP-ADaLR performance for varying file sizes using. We compare the performance of TCP-ADaLR with TCP NewReno and TCP SACK. Simulation results show that TCP-ADaLR mechanism improves TCP performance in cases of large file transfers in lossless networks with large propagation delays. When the file size is larger than 50 MB, TCP ADaLR improves TCP throughput while the throughput of the TCP NewReno and TCP SACK connections remain unchanged. Furthermore, when transfer file size is 500 MB TCP-ADaLR throughput increases up to 75 % compared to TCP NewReno and TCP SACK.

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