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Recent researches in video transmission over heterogeneous networks move toward cross-layer design to realize the optimal video quality. In this paper, the authors investigate the cross layer approach between H.264 video coding layer and IEEE 802.11e Medium Access Control (MAC) layer on the issues of how to improve error resiliency of H.264 video using Flexible Macroblock Ordering (FMO), and how to reduce packet dropping rate at MAC layer. They propose an adaptive FMO map generation to separate high and low important macro-blocks to different priority queues based on the overflow state of MAC layer queues.
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