Quantification of Packet Delay Variation through the Coefficient of Throughput Variation

Document type: Conference Papers
Peer reviewed: Yes
Full text:
Author(s): Tahir Nawaz Minhas, Markus Fiedler, Patrik Arlos
Title: Quantification of Packet Delay Variation through the Coefficient of Throughput Variation
Conference name: The 6th International Wireless Communications and Mobile Computing Conference IWCMC
Year: 2010
Pagination: 336-340
ISBN: 978-1-4503-0062-9
Publisher: ACM
City: Caen
URI/DOI: http://doi.acm.org/10.1145/1815396.1815474
Organization: Blekinge Institute of Technology
Department: School of Computing (Sektionen för datavetenskap och kommunikation)
School of Computing S-371 79 Karlskrona
+46 455 38 50 00
http://www.bth.se/com
Authors e-mail: tahir.nawaz.minhas@bth.se, markus.fiedler@bth.se, patrik.arlos@bth.se
Language: English
Abstract: Packet delay variation plays an important role in network
performance degradation and affects the user-perceptual quality,
especially in case of real-time services such as video
streaming, VoIP etc. Lightweight methods for detecting network
performance issues are desirable as compared to taskintensive
measurement and analysis. On this background,
this paper discusses the applicability of the Coefficient of
Throughput Variation (CoTV) to quickly and reliably detect
bottleneck behavior between two arbitrary points in a
network. The CoTV can be used as a Reduced Reference
Metric. It is relatively simple to calculate, compare and interpret,
yet powerful to provide control feedback when facing
changes in network performance. In this paper, we demonstrate
above mentioned properties of the CoTV through a
formula relating it to the sample interval of the throughput
and the variability of the delay. The latter is shown to be
detectable on time scales that are significantly larger than
that of the variability itself. This observation is a key enabler
for reducing the load on the device that performs the
analysis due to the possibility to use large sample intervals.
We also describe how difference and ratio of CoTV at outlet
and inlet can be used to identify network performance
issues.
Subject: Computer Science\Networks and Communications
Keywords: Packet Delay Variation, Throughput, Coefficient of Throughput Variation, Network Measurement Traffic Shaping
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