Abstract
This paper proposes a dynamic cross-layer approach to enhance quality of MPEG-4 video stream transmission over an IEEE 802.11e wireless mesh networks. IEEE 802.11e standard either classifies video data to a specific access category (AC) which causes high packet loss at heavy load conditions or uses static mapping to map video data to lower priority AC which causes unnecessary transmission delays and packet losses in case of light load network. Some developed techniques dynamically map video frames to the other priority queues causing highly degradation in video quality. The paper work proposes a new approach that combines a new mapping cross-layer between the medium access control and the application layer for dynamically mapping video frames based on frame priority and queue load congestion with low priority queue parameters adaptation such as minimum and max contention window to reduce queuing delay. Proposed approach is compared with already developed schemes. Simulation results give high performance under light and heavy loads network traffic. All implementations are simulated using NS2 Simulator tool with required configuration to examine all possible types of traffics.
Published Version
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