Cross-Layer Design of QoS-Aware Multimedia Streaming with Integrated Propagation and Channel Modelling in Heterogeneous Wireless Networks
DOI:
https://doi.org/10.31838/NJAP/07.02.30Keywords:
Cross-layer architecture, QoS-aware streaming, heterogeneous wireless networks, propagation modelling, NS-3 simulation, multimedia delivery, adaptive MAC, channel estimation, video quality enhancementAbstract
The video streaming aspects and other multimedia applications that have increased at an explosive rate in the heterogeneous wireless networks (HWNs) have presented complex issues in connection with continuous Quality of Service (QoS). The traditional layered network models are not always good enough to handle the dynamic characteristics of a network like mobility, change in channel quality and congestion. This research suggests further development of a new cross-layer model that has propagation awareness of the physical layer model, adaptive MAC controls, and application-level smarts, so that multimedia streaming is robust and QoS-sensitive. The physical layer utilizes realistic models, such as log-distance path loss, log-normal shadowing, and Nakagami-m fading, to model variation in the channel. The MAC layer automatically adapts the contention parameters to the network load, as well as multimedia traffic priorities queues. An improved routing protocol, AODV, which considers channel state and delay, is applied to the network layer and the application layer adjusts the video encoding rates depending on the end-to-end feedback and buffer occupancy. The whole system has been used and simulation tested applied in NS-3.36 simulation environment when we are using H.264 video trace traffic over UDP within a 50-node wireless topology with diverse mobility environments. The experimental evidence shows that proposed architecture performs much better than baseline models in terms of packet delivery ratio, which is 91.7%, a decrease in end-to-end delay by up to 48% and enhancing video quality with the peak signal-to-noise ratio (PSNR) of 35.2 dB. These results confirm the utility of cross-layer optimization with respect to offering resilient as well as high quality multimedia transmission across complex wireless networks.
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