A hierarchical packet pre-dropping approach for improved MPEG-4 video transmission over IEEE 802.11e networks

This paper develops a hierarchical packet pre-dropping (HPPD) approach that exploits different methods to process I (intra-coded)/P (predictive-coded)/B (bidirectionally predictive-coded) video frame packets to improve the video transmission quality over IEEE 802.11e Wireless Local Area Networks (WLANs). HPPD refers to the dropping of arriving packets if the preceding video frame packets in the same Group of Pictures (GOP) have been dropped. The simulation results demonstrate that, in terms of PSNR, the proposed scheme outperforms exiting schemes such as EDCA (Enhanced Distributed Channel Access) and adaptive mapping and novel mapping mechanism, suggesting that the resource of access channel in WLANs is not wasted in the transmission of useless video data.