A Perceptual ARQ Algorithm for H.264 Live Streaming over Congested 802.11e Wireless LANs
Paolo Bucciol, Enrico Masala, Enrica Filippi, Juan Carlos De Martin · PORTO Publications Open Repository TOrino (Politecnico di Torino) · 2006
A perceptually enhanced ARQ algorithm for real-time video communications over 802.11 wireless networks is presented.The algorithm operates at the application level to exploit information about the perceptual and temporal importance of each packet.A priority value is associated to each packet to determine which one to retransmit at each retransmission opportunity.Compared to the standard 802.11MAC-layer ARQ scheme, the proposed technique delivers higher perceptual quality because it retransmits only the most perceptually important packets.Live video streaming of H.264 sequences has been simulated in a realistic 802.11e infrastructured scenario.Results show that the proposed method consistently outperforms the standard link-layer 802.11 retransmission scheme, delivering gains up to 10 dB of PSNR with very low transmission delays, while the impact on concurrent traffic is very limited.