This flexibility will become more and more important as subscribers start to demand higher quality feeds (1080p and 4K). For example, during periods of network congestion, operators can set session management polices to permit a predefined level of network over-subscription rather than blocking all new sessions. Although adaptive streaming was originally developed for "over-the-top" video applications over unmanaged networks, it also brings significant advantages to managed networks applications. So, if the network throughput suddenly drops, the picture may degrade but the end user still sees a picture. Adaptive streaming operates by dynamically adjusting the play-out rate to stay within the actual network throughput to a given endpoint, without the need for "rebuffering". BACKGROUND There is a great deal of interest in HTTP adaptive streaming because it can greatly improve the user experience for video delivery over unmanaged networks. The results are being published here for the first time.
The concepts described in this paper have been prototyped to show improvements in fairness and overall network throughput without placing special constraints on the client implementation (which is typically outside of the operator s control). Benefits for the consumer include: - a more consistent overall quality of viewing experience, and - the ability to simultaneously use multiple devices within the home. Benefits for the network operator include: - enforcing fairness in the network (without resorting to techniques such as deep packet inspection), - managing and ensuring consumers overall quality of experience, and - preventing network instability that can be caused by competing clients in a shared access network. Readers of the paper will gain an understanding of the network impacts of implementing HTTP adaptive streaming, and how network management techniques may be applied to optimize fair bandwidth allocation between competing streams.
1 OPTIMIZING FAIRNESS OF HTTP ADAPTIVE STREAMING IN CABLE NETWORKS Michael Adams Chris Phillips Solution Area Media Ericsson Abstract This paper describes a novel approach to traffic management for HTTP adaptive streaming that optimizes fairness across multiple clients and increases network throughput.
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