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Objective and Perceptual Impact of TCP Dropping Policies on VoIP Flows

Authors:
Erika P. Alvarez-Flores
Juan J. Ramos-Munoz
Jose M. Lopez-Vega
Juan M. Lopez-Soler

Keywords: Active Queue Management; QoS; VoIP

Abstract:
The integration of voice and data has allowed the development of new services and applications on the network. Despite of the growth of voice over IP applications, main active queue management (AQM) algorithms primarily focus on TCP traffic. An AQM scheme implicitly adopts a policy for selecting the packet to be marked or dropped. However, the traditional packet selection policies do not take into account the effect on the Quality of Service for different traffic types. In this case, is not always satisfied the quality of service of applications such as Voice over IP (VoIP), which require limited packet delay and loss rate. In this work we study the effect of TCP dropping policy over VoIP for scenarios with mixed traffic conditions. We evaluate their objective and perceptual impact on VoIP flows. As main result, we show that the adoption of one of the proposed AQM dropping procedures improves the user’s perceptual score for VoIP, with no penalty on the TCP throughput and loss rate.

Pages: 78 to 83

Copyright: Copyright (c) IARIA, 2012

Publication date: July 22, 2012

Published in: conference

ISSN: 2308-3549

ISBN: 978-1-61208-215-8

Location: Nice, France

Dates: from July 22, 2012 to July 27, 2012