 An article authored by Valentin Burger, George Darzanos, Ioanna Papafili and Michael Seufert has been accepted to be published in the proceedings of the 10th International Conference on P2P, Parallel, Grid, Cloud and Internet Computing (3PGCIC 2015). In this article, we focus on the trafe-off between QoE and operational costs for video streaming, as it contributes the largest share of today's consumer Internet traffic and its demand on content delivery networks is continuously growing. To cope with the increasing demand of video streaming, recent work proposes mitigating end-user equipment to support content delivery at the edge of the network. The throughput of end-user equipment supporting content delivery is limited by the uplink of the users Internet connection. Especially for video streaming insufficient throughput causes the video to stall and affects the Quality of Experience (QoE) of end-users. To prevent video streams from stalling, we consider a tiered caching architecture, which requests higher tier caches to support content delivery, if the uplink throughput drops below a certain threshold. We conduct a simulative performance evaluation of the mechanism to investigate its impact on the QoE of end-users. Our results show that especially if the upload bandwidth of end-user equipment is low the setting of the threshold has a high impact. This can be used by operators to achieve the desired trade-off between QoE and operational cost for cache resources. |
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