A priority-based EDF scheduling algorithm for H.264 video transmission over WiMAX network

With the increasing popularity of broadband wireless networks, video transmission over WiMAX networks has attracted more and more attention in both industrial and academic fields. In this paper, a Priority-based EDF (PEDF) scheduling algorithm, which combines EDF (Earliest Deadline First) with the characteristics of the multimedia, is proposed for H.264 video delivery. To meet the QoS requirements of different video frames, an adaptive deadline is assigned to change the miss rate of video packet dynamically in PEDF. In this way, we can better protect the more important video frames against loss. Simulation results show that the PEDF can achieve higher PSNR than the legacy RR, WFQ and EDF algorithms, and the quality of reconstructed video is improved significantly.