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One of the key challenges in multimedia networks is video delivery overwireless channels. MRC (Multi-Resolution Coding) Layered video, divides videointo a base layer and multiple enhancement layers. In this paper, we aim toimprove video quality, impacted by high channel contention, through mappingindividual video layers to EDCA (Enhanced Distributed Channel Access) accesscategories in order to maximize the average number of reconstructed videolayers. We propose an adaptive cross layer video layers mapping technique thatoptimally enhances the QoS of wireless video transmission over IEEE 802.11eEDCA priority queues. The optimization is based on a dynamic program that takesinto account the EDCA parameters and the layered dependency nature of layeredvideo delivery. Our proposed technique makes use of a channel delay estimationmodel and an estimation of average video useful layers delivered. The optimalmapping strategies are selected by an optimization module based on theinformation from the analytical model. The accuracy of our optimized mappingtechnique performance is verified through extensive simulations. The obtainedresults illustrate significant trade-off between complexity and delivered videoquality for canonical mapping schemes.

An analytic study of a distributed EDCA-based QoS mapping for layered video delivery in WLAN