Cross layer routing and rate adaptation for video transmission in multi-radio Wireless Mesh Networks

In this paper, we propose a cross layer optimization technique for video transmission in multi-radio Wireless Mesh Networks (WMNs). WMNs are used as back haul to connect various networks such as Wi-Fi, Wi-MAX etc. to the internet. The presence of multiple radios in this networks increases the capacity but introduces an interference. Thus, designing a better routing metric to find optimal path is an important issue. Further, as the routing metric and rate adaptation decisions are strongly related, the joint approach is needed to improve the performance of the network. In this work, we propose the cross layer optimization technique by designing a routing metric which considers the link quality parameters from various layers and use some of these parameters for rate adaptation to improve the QoS parameters of the network. We implement our technique using AODV protocol in NS2. The results reveal that the joint approach improves the QoS parameters such as throughput, packet delivery fraction (PDF), Peak signal to noise ratio (PSNR) and frame delay compared to existing approaches.