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RTCP hierarchical aggregation

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The Hierarchical Aggregation (or also known as RTCP feedback hierarchy) is an optimization of the RTCP feedback model to shift borders of maximum number of users limit [1], [2]. The RTCP bandwidth is constant and takes just 5% of session bandwidth. Therefore the reporting interval about QoS depends, among others, on a number of session members and for very large sessions it can become very high (minutes or even hours)[2]. This would cause time-shifted and very inaccurate reported status about the current session status and any optimization made by sender could even have a negative effect.

The Hierarchical Aggregation is used with Single-Source Multicast where only single source is allowed, i.e. IPTV.

References

  1. KOMOSNY D., NOVOTNY V. Tree Structure for Specific-Source Multicast with feedback Aggregation, in ICN07 - The Sixth International Conference on Networking . Martinique, 2007, ISBN 0-7695-2805-8
  2. NOVOTNY, V., KOMOSNY, D. Optimization of Large-Scale RTCP Feedback Reporting in ICWMC 2007. ICWMC 2007 - The Third International Conference on Wireless and Mobile Communications. Guadeloupe, 2007, ISBN: 0-7695-2796-5
  3. J. Chesterfield, E. M. Schooler. "An Extensible RTCP Control Framework for Large Multimedia Distributions"
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