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doi:10.1016/j.peva.2003.07.004 
Copyright © 2003 Elsevier B.V. All rights reserved.
Optimization of a packet video receiver under different levels of delay jitter: an analytical approach*1
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Nikolaos Laoutarisa, 
, 
, Benny Van Houdt, b and Ioannis Stavrakakis, a
Received 8 October 2002;
Abstract
This paper studies the problem of analyzing and designing optimal playout adaptation policies for packet video receivers (PVRs) that operate in a delay jitter inducing best-effort network, like the current Internet. The developed system model is built around the Ek/Di/1/N phase-type queue and allows for the effective modeling of key design and system parameters, such as: the level of delay jitter, the performance metrics and the employed playout policy. The optimal playout policy is derived under k-Erlang interarrivals by formulating and solving an optimization problem. The (theoretical) optimal solution is transformed into an approximately optimal one that utilizes observable information and it is, thus, feasible. Numerical results are derived under the optimal policy and compared against those under the optimal policy that assumes a fixed level of jitter as determined by Poisson arrivals, as well as against the deterministic service that applies no playout adaptation. Based on this work, a PVR is proposed that adapts to varying network delay jitter and tries to induce a performance that approximates the derived theoretical optimal one.
Author Keywords: Packet video communications; Network jitter; Synchronization quality; Playout adaptation
Article Outline
- 1. Introduction
- 2. Related work
- 3. Modeling delay jitter
- 4. Performance analysis of PVRs under k-Erlang arrivals
- 5. Derivation of the optimal playout scheduler for different levels of network jitter
- 6. Numerical results and discussion
- 6.1. Optimal playout policies for different levels of network jitter
- 6.2. Controlling the buffering delay
- 6.3. Comparison of playout policies: EO vs. PO and DS
- 7. Applying the phase-aware optimal policy to a real-world video receiver
- 8. Overall system architecture
- 9. Conclusions
- Acknowledgements
- Appendix A. Value-iteration algorithm
- References
- Vitae
*1 This work was supported in part by the Special Account for Research Grants of the National and Kapodistrian University of Athens and the IST program of the European Union under contract IST-2001-32686 (Broadway).
