IMPROVEMENT OF VOIP QUALITY BY PACKET DROPPING IN ADSL ROUTERS

Qin Dai, Matthias Baumann, Ralf Lehnert

Abstract

Packet dropping is known as a simple mechanism to control TCP traffic. In this paper, TCP packet dropping is introduced in the egress router of an ADSL downlink. The aim is to improve the quality of VoIP connections that compete with TCP applications in downlink direction. The ADSL downlink buffer is assumed to operate as simple FCFS queue. Different simulations have been conducted that evaluate the mechanism in two scenarios. Firstly, the long-term impact of the mechanism both on VoIP application and TCP applications is investigated. Secondly, with more realistic network settings, the effectiveness of the mechanism for a short-time real speech is evaluated. The speech’s PESQ estimate is used to assess the service quality. The results indicate that in both cases packet dropping can improve the VoIP quality. However, the required high dropping ratio can result in TCP traffic bursts and therefore unstable VoIP quality as well as bad TCP performance.

References

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Paper Citation


in Harvard Style

Dai Q., Baumann M. and Lehnert R. (2007). IMPROVEMENT OF VOIP QUALITY BY PACKET DROPPING IN ADSL ROUTERS . In Proceedings of the Second International Conference on Signal Processing and Multimedia Applications - Volume 1: SIGMAP, (ICETE 2007) ISBN 978-989-8111-13-5, pages 265-272. DOI: 10.5220/0002135502650272


in Bibtex Style

@conference{sigmap07,
author={Qin Dai and Matthias Baumann and Ralf Lehnert},
title={IMPROVEMENT OF VOIP QUALITY BY PACKET DROPPING IN ADSL ROUTERS},
booktitle={Proceedings of the Second International Conference on Signal Processing and Multimedia Applications - Volume 1: SIGMAP, (ICETE 2007)},
year={2007},
pages={265-272},
publisher={SciTePress},
organization={INSTICC},
doi={10.5220/0002135502650272},
isbn={978-989-8111-13-5},
}


in EndNote Style

TY - CONF
JO - Proceedings of the Second International Conference on Signal Processing and Multimedia Applications - Volume 1: SIGMAP, (ICETE 2007)
TI - IMPROVEMENT OF VOIP QUALITY BY PACKET DROPPING IN ADSL ROUTERS
SN - 978-989-8111-13-5
AU - Dai Q.
AU - Baumann M.
AU - Lehnert R.
PY - 2007
SP - 265
EP - 272
DO - 10.5220/0002135502650272