Perceptually enhanced ARQ for live video streaming over congested 802.11e networks

Authors:
P. Bucciol;E. Masala;E. Filippi;J. C. De Martin
Affiliations:
Dipartimento di Automatica e Informatica, Italy;Dipartimento di Automatica e Informatica, Italy;Advanced System Technologies, STMicroelectronics S.r.l., Cornaredo, Milano, Italy;IEIIT-CNR, Politecnico di Torino, Corso Duca degli Abruzzi, Torino, Italy
Venue:
AIC'05 Proceedings of the 5th WSEAS International Conference on Applied Informatics and Communications
Year:
2005

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Abstract

In this paper we present a perceptual ARQ algorithm specifically designed for real-time 802.11 video communications. A fundamental characteristic of the algorithm is its ability to take into account the perceptual and temporal importance of each packet at the same time. A priority value is associated to each packet to determine which one to retransmit at each retransmission opportunity. Compared to the standard 802.11 MAC-layer ARQ scheme, the proposed technique delivers higher perceptual quality because only the most perceptually important packets are retransmitted. Simulations of H. 264 live video streaming in a realistic 802.11e infrastructured scenario show that the proposed method consistently out-performs the standard link-layer 802.11 retransmission scheme, delivering gains up to 10 dB of PSNR as well as very low transmission delays.