Timeout Reduction Method for Multistream Segmented Download Using PR-SCTP

As wireless links have spread over the world, we often download large files on lossy networks. However, unnecessary strict order guarantee of TCP with single stream results in performance degradation on lossy networks. Therefore, a segmented download method which uses SCTP multistream has been proposed to address the issue. Since the existing research evaluated the method only with simulation experiments, we conduct intensive experiments with real machines. Furthermore, we propose a timeout reduction method using both PR-SCTP that retransmits the lost packet for a limited time and SCTP multistream. Our approach does not change the timeout policy of SCTP but requests the lost data as a part of application layer protocol. As a result, we show that the proposed method yields at most 10% and 30% higher performance for 5% and 10% packet loss rates than the conventional methods, respectively. Our proposal can constitute one of the assurance technologies which sustain higher throughput even on lossy networks.