Considering spurious timeout in proxy for improving TCP performance in wireless networks

Abstract

Abstract-In this paper, we introduce a new proxy that effectively prevents unnecessary retransmissions from flowing over a wireless link on a path with sudden delay. The proposed STD algorithm detects spurious timeout based on the comparison of the measured inter-arrival timeout of ACK during spurious timeout period with the average inter-arrival time of ACK. It responses to spurious timeout by filtering duplicate ACKs that can cause spurious fast retransmission. Simulation results show that proposed Spurious Timeout Detection (STD) algorithm performs better than, or as well as, other end-to-end mechanisms in the ranges of data rate which current wireless networks can provide.

Evaluation of the Bridge Architecture

“…When Figs. 5.18 and 6.6 are compared, it can be seen that the UART Data Tx time is the same at both 11.2 kbps and 24 kbps, which is a fixed overhead. However, NFC Data Tx time is As explained earlier, the NFC module requires the packet to be available for transmission at least 2 ms before the time slot occurs.…”

“…This affects the total transmission time and thus the throughput of the TCP session. The throughput could be improved by ACKs coming from the appliance and the end-user device, similar to the technique proposed in [5]. This would reduce the number of packets on the NFC channel and improve the system performance.…”

Using the ECN Nonce to Detect Spurious Loss Events in TCP

“…A Performance Enhancing Proxy (PEP) based approach is described in [14] -here, the performance of TCP is enhanced by filtering out DupACKs to the sender when a spurious timeout has happened in order to prevent it from unnecessarily retransmitting packets. This method is based on the assumption that the sender is unable to detect a spurious timeout by itself.…”

An algorithm to detect TCP spurious timeouts and its application to operational UMTS/GPRS networks

“…Ref. [11] proposes a proxy mechanism to detect SRTOs and to modify TCP acknowledgments in order to avoid SRTOs at the data sender.…”