QoS-based optimal adaptive playout-buffer scheduling using the packet arrival distribution

Authors:
Sanghyun Chi;Baxter F. Womack
Affiliations:
The University of Texas at Austin, Austin, TX;The University of Texas at Austin, Austin, TX
Venue:
MILCOM'09 Proceedings of the 28th IEEE conference on Military communications
Year:
2009

Citing 2
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ICASSP '01 Proceedings of the Acoustics, Speech, and Signal Processing, 2001. on IEEE International Conference - Volume 03

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Abstract

A voice conversation quality over IP networks is mainly affected by the end-to-end delay and the packet-loss rate. Various delay channel environment can cause the early/ late arrival packet loss without actual packet loss. To overcome time-variant dynamics of transmission channels for IP telephone services, an adaptive playout-buffer scheduling is proposed. Previous playout-buffer schedulers focused on eliminating delay variation effects regardless of the quality of service (QoS). The proposed metric provides a minimum playout-buffer size, simultaneously meeting a desired QoS. The minimum buffer size is desirable because of the impact of the end-to-end delay on the perceived speech quality. The optimal buffer size is analytically calculated by exploiting the stochastic distribution of the packet arrival intervals.