Performance evaluation of congestion window validation for DASH transport

Nazir, Sajid and Hossain, Ziaul and Secchi, Raffaello and Broadbent, Matthew and Petlund, Andreas and Fairhurst, Gorry (2014) Performance evaluation of congestion window validation for DASH transport. In: NOSSDAV '14 Proceedings of Network and Operating System Support on Digital Audio and Video Workshop. ACM, New York. ISBN 9781450327060

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.