A paper
entitled “How to Adapt: SVC-based Quality Adaptation for Hybrid Peercasting
Systems” by Matthias Wichtlhuber, Julius Rückert, David Winter, David Hausheer
has been accepted for presentation at IM 2015 conference (IFIP/IEEE Integrated
Network Management Symposium).
Live streaming of large-scale events such as the
Olympic Games with a huge number of viewers is challenging, as the streaming
infrastructure needs to scale fast and big, and often in an unpredictable
manner. Peer-to-peer (P2P) live streaming (Peercasting) has proven to be
beneficial in these scenarios, as resources are scaling inherently with the
number of nodes. However, churn behavior in a node’s neighborhood may result in
fluctuating downstream bandwidth and thus freezing (stalling) playback. Related
work tries to mitigate this effect by using layered video codecs, focusing on
single-dimensional scalability in mesh-pull based systems. Yet, the benefits of
multidimensional scalability (resolution, frame rate, and quantization) combined
with coexisting pull-/push mechanisms introduced by modern hybrid P2P streaming
architectures have not been studied in detail. Consequently, this work proposes
a new scheduling algorithm taking these aspects into account. The evaluation
shows large benefits for end-users by reducing the frequency of stalls by 90%
even under extreme conditions. |
News >