Effect of Premature ACK Transmission Timing on Throughput in TCP with a Performance Enhancing Proxy

Hui WANG; Shigeyuki OSADA; Tokumi YOKOHIRA; Kiyohiko OKAYAMA; Nariyoshi YAMAI

doi:10.1093/ietcom/e90-b.1.31

Effect of Premature ACK Transmission Timing on Throughput in TCP with a Performance Enhancing Proxy

Hui WANG, Shigeyuki OSADA, Tokumi YOKOHIRA, Kiyohiko OKAYAMA, Nariyoshi YAMAI

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In order to improve TCP performance, the use of a PEP (Performance Enhancing Proxy) has been proposed. The PEP operates on a router along a TCP connection. When a data packet arrives at the PEP, it forwards the packet to the destination host, transmits the corresponding ACK (premature ACK) to the source host on behalf of the destination host, and stores a copy of the packet in a local buffer (PEP buffer) in case the packet needs to be retransmitted. In this paper, in accordance with a strategy that keeps the number of prematurely acknowledged packets in the PEP buffer below a fixed threshold (watermark) value, we investigate the relation between the watermark value and the average throughput. Extensive simulations show that the results can be roughly classified into two cases. In the first case, the average throughput becomes larger for larger watermark values and becomes a constant value when the watermark value is over a certain value. In the second case, although the average throughput becomes larger for lager watermark value in the same way, it decreases when the watermark value is over a certain value. We also show that the latter (former) case can occur more easily as the propagation delay in the input side network of the PEP becomes smaller (larger) and the propagation delay in the output side network of the PEP becomes larger (smaller), and also show that the latter (former) case can occur more easily as the transmission speed in the input side network becomes larger (smaller) and the transmission speed in the output side network becomes smaller (larger) while the PEP buffer capacity becomes smaller (larger).

Publication: IEICE TRANSACTIONS on Communications Vol.E90-B No.1 pp.31-41

Publication Date: 2007/01/01

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Online ISSN: 1745-1345

DOI: 10.1093/ietcom/e90-b.1.31

Type of Manuscript: PAPER

Category: Network

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Hui WANG, Shigeyuki OSADA, Tokumi YOKOHIRA, Kiyohiko OKAYAMA, Nariyoshi YAMAI, "Effect of Premature ACK Transmission Timing on Throughput in TCP with a Performance Enhancing Proxy" in IEICE TRANSACTIONS on Communications, vol. E90-B, no. 1, pp. 31-41, January 2007, doi: 10.1093/ietcom/e90-b.1.31.
Abstract: In order to improve TCP performance, the use of a PEP (Performance Enhancing Proxy) has been proposed. The PEP operates on a router along a TCP connection. When a data packet arrives at the PEP, it forwards the packet to the destination host, transmits the corresponding ACK (premature ACK) to the source host on behalf of the destination host, and stores a copy of the packet in a local buffer (PEP buffer) in case the packet needs to be retransmitted. In this paper, in accordance with a strategy that keeps the number of prematurely acknowledged packets in the PEP buffer below a fixed threshold (watermark) value, we investigate the relation between the watermark value and the average throughput. Extensive simulations show that the results can be roughly classified into two cases. In the first case, the average throughput becomes larger for larger watermark values and becomes a constant value when the watermark value is over a certain value. In the second case, although the average throughput becomes larger for lager watermark value in the same way, it decreases when the watermark value is over a certain value. We also show that the latter (former) case can occur more easily as the propagation delay in the input side network of the PEP becomes smaller (larger) and the propagation delay in the output side network of the PEP becomes larger (smaller), and also show that the latter (former) case can occur more easily as the transmission speed in the input side network becomes larger (smaller) and the transmission speed in the output side network becomes smaller (larger) while the PEP buffer capacity becomes smaller (larger).
URL: https://globals.ieice.org/en_transactions/communications/10.1093/ietcom/e90-b.1.31/_p

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@ARTICLE{e90-b_1_31,
author={Hui WANG, Shigeyuki OSADA, Tokumi YOKOHIRA, Kiyohiko OKAYAMA, Nariyoshi YAMAI, },
journal={IEICE TRANSACTIONS on Communications},
title={Effect of Premature ACK Transmission Timing on Throughput in TCP with a Performance Enhancing Proxy},
year={2007},
volume={E90-B},
number={1},
pages={31-41},
abstract={In order to improve TCP performance, the use of a PEP (Performance Enhancing Proxy) has been proposed. The PEP operates on a router along a TCP connection. When a data packet arrives at the PEP, it forwards the packet to the destination host, transmits the corresponding ACK (premature ACK) to the source host on behalf of the destination host, and stores a copy of the packet in a local buffer (PEP buffer) in case the packet needs to be retransmitted. In this paper, in accordance with a strategy that keeps the number of prematurely acknowledged packets in the PEP buffer below a fixed threshold (watermark) value, we investigate the relation between the watermark value and the average throughput. Extensive simulations show that the results can be roughly classified into two cases. In the first case, the average throughput becomes larger for larger watermark values and becomes a constant value when the watermark value is over a certain value. In the second case, although the average throughput becomes larger for lager watermark value in the same way, it decreases when the watermark value is over a certain value. We also show that the latter (former) case can occur more easily as the propagation delay in the input side network of the PEP becomes smaller (larger) and the propagation delay in the output side network of the PEP becomes larger (smaller), and also show that the latter (former) case can occur more easily as the transmission speed in the input side network becomes larger (smaller) and the transmission speed in the output side network becomes smaller (larger) while the PEP buffer capacity becomes smaller (larger).},
keywords={},
doi={10.1093/ietcom/e90-b.1.31},
ISSN={1745-1345},
month={January},}

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TY - JOUR
TI - Effect of Premature ACK Transmission Timing on Throughput in TCP with a Performance Enhancing Proxy
T2 - IEICE TRANSACTIONS on Communications
SP - 31
EP - 41
AU - Hui WANG
AU - Shigeyuki OSADA
AU - Tokumi YOKOHIRA
AU - Kiyohiko OKAYAMA
AU - Nariyoshi YAMAI
PY - 2007
DO - 10.1093/ietcom/e90-b.1.31
JO - IEICE TRANSACTIONS on Communications
SN - 1745-1345
VL - E90-B
IS - 1
JA - IEICE TRANSACTIONS on Communications
Y1 - January 2007
AB - In order to improve TCP performance, the use of a PEP (Performance Enhancing Proxy) has been proposed. The PEP operates on a router along a TCP connection. When a data packet arrives at the PEP, it forwards the packet to the destination host, transmits the corresponding ACK (premature ACK) to the source host on behalf of the destination host, and stores a copy of the packet in a local buffer (PEP buffer) in case the packet needs to be retransmitted. In this paper, in accordance with a strategy that keeps the number of prematurely acknowledged packets in the PEP buffer below a fixed threshold (watermark) value, we investigate the relation between the watermark value and the average throughput. Extensive simulations show that the results can be roughly classified into two cases. In the first case, the average throughput becomes larger for larger watermark values and becomes a constant value when the watermark value is over a certain value. In the second case, although the average throughput becomes larger for lager watermark value in the same way, it decreases when the watermark value is over a certain value. We also show that the latter (former) case can occur more easily as the propagation delay in the input side network of the PEP becomes smaller (larger) and the propagation delay in the output side network of the PEP becomes larger (smaller), and also show that the latter (former) case can occur more easily as the transmission speed in the input side network becomes larger (smaller) and the transmission speed in the output side network becomes smaller (larger) while the PEP buffer capacity becomes smaller (larger).
ER -