Application-Level Perceptual ARQ for H.264 Video Streaming over 802.11 Wireless LAN's
Paolo Bucciol, G. Davini, Enrico Masala, Enrica Filippi, Juan Carlos De Martin · PORTO Publications Open Repository TOrino (Politecnico di Torino) · 2004
A new ARQ algorithm for video streaming over 802.11 wireless networks is presented.The algorithm operates at the application level in order 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.With respect to the standard 802.11MAC-layer ARQ scheme, the proposed cross-layer technique delivers higher perceptual quality because it retransmits only the most perceptually important packets.Video streaming of H.264 test sequences has been simulated using ns in a realistic home network scenario, in which data flows have been assigned to different 802.11e access categories according to their QoS requirements.Results show that the proposed method consistently outperforms the standard link-layer 802.11 retransmission scheme, delivering more than 1.5 dB of PSNR gain with a very limited impact on concurrent traffic.