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Efficient new delayed ACK for TCP: old problem, new insight by Ming Li; Andrey Lukyanenko; Sasu Tarkoma; Antti Ylä-Jääski is a scholarly article available to read on EtoBox.

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When a TCP connection experiences a timeout, the sender must wait at least RT Omin (Minimum Retransmission Timeout) before doing the retransmission, during which the channel may be completely idle, undermining the throughput and channel efficiency. In this paper, we investigate the origin of RT Omin and find that it is needed to mitigate against spurious timeouts when the Delayed ACK (DA) scheme for TCP is implemented. Motivated by this observation, we propose a deployable and TCP-compatible new Delayed ACK (NDA) to replace the legacy DA. Our solution differs with previous work is that instead of using complex algorithms or fine-grained timer to tune RT Omin, we modify the DA scheme with minor changes to allow the sender to remove the RT Omin constraint while reserving the delayed ACK function at the receiver. In order to eliminate the aggressiveness of RTO (Retransmission Timeout) after removing RT Omin, we use coding techniques to encode the timeout retransmitted packets to make the potential spurious retransmissions useful. The simulation results demonstrate that in lossy wireless networks, NDA is efficient, because it achieves much higher TCP goodput and channel efficiency comp

Author

Ming Li; Andrey Lukyanenko; Sasu Tarkoma; Antti Ylä-Jääski

Publisher

ACM

Published

2013

Language

EN