Performance Evaluation of Congestion Window Validation for DASH Transport

Authors:
Sajid Nazir;Ziaul Hossain;Raffaello Secchi;Matthew Broadbent;Andreas Petlund;Gorry Fairhurst
Affiliations:
School of Engineering, University of Aberdeen, AB24 3UE, Aberdeen, UK;School of Engineering, University of Aberdeen, AB24 3UE, Aberdeen, UK;School of Engineering, University of Aberdeen, AB24 3UE, Aberdeen, UK;School of Computing and Communications, Lancaster University, LA1 4WA, Lancaster, UK;Department of Informatics, Postboks 1080 Blindern, University of Oslo, 0316 Oslo, Norway;School of Engineering, University of Aberdeen, AB24 3UE, Aberdeen, UK
Venue:
Proceedings of Network and Operating System Support on Digital Audio and Video Workshop
Year:
2014

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Abstract

A recent proposed update to TCP congestion control, TCP-newCWV, has targeted congestion control for rate-limited applications. These methods need to be explored in the context of rate-adaptive applications, such as DASH. The new method enables a client to exploit the persistence of a DASH connection and enables the DASH server to rapidly resume transmission of a series of video segments using a single TCP connection. Another technique, called 'Pacing' smoothes DASH bursts when there is no TCP ACK clock, and is shown to significantly reduce burst loss. These two methods in combination can increase the application performance. This paper investigates the effect of implementing these techniques on a DASH flow in different congestion scenarios and whether the method can promote better capacity sharing while minimizing the latency experienced by other flows sharing a common network bottleneck. The results confirm that newCWV with Pacing provides a benefit as a platform for DASH transport.