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Application layer QoS

This paper discusses the challenges in providing Quality of Service (QoS) in overlay networks, specifically focusing on Content Delivery Networks (CDNs) for bulk data and streaming applications. The paper explores topics such as CDN caching strategies, handling heterogeneity and variable quality network access, and the need for fast setup and teardown in overlay networks. Additionally, it examines the management of overlay network hierarchies and the filtering mechanisms necessary for QoS.

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Application layer QoS

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  1. Application layer QoS Don Towsley Univ. Massachusetts

  2. Premise Networking Technology • lots of BW in core • bottlenecks at peering points, access points • little support for QoS Applications • bulk data • continuous media • interactive (games, teleconferencing) • … and others • widely variable QoS requirements

  3. Overlay networks CDNs for bulk data • caching understood • logical topology? • routing? CDNs for streaming applications • caching strategies? (prefix caching) • handling heterogeneity? (transcoding) • handling variable quality network access? (resilient packet level FEC, playout delay adjustment)

  4. Next generation • distributed simulation nets • distributed game nets • teleconferencing nets • intelligent information retrieval nets

  5. teleconferencing network intelligent game network video distribution network information retrieval network Overlay networks

  6. Challenges • filtering (for QoS) • fast setup and teardown • specialized vs. general purpose • overlay net hierarchies • management

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