Cross-Layer Approach to Multiuser H.264 Video Transmission Over Wireless Networks

This paper presents a novel cross-layer approach to multiuser H.264/AVC video stream transmission over wireless networks. The authors consider the joint optimization of three layers of the protocol stacks: the application (APP) layer, the media access control (MAC) layer and the physical (PHY) layer. At the APP layer, the contribution of each packet to the perceptual video quality is evaluated by distortion effect of the packet loss, which is estimated by a Packet Relative Importance Index (PRII). At the MAC layer and the PHY layer, the Gilbert-Elliott (GE) model is employed to describe the time-varying nature of the wireless networks.