While joint source channel coding techniques and broader cross-layer design concepts have been well investigated 
in the information theory and other research communities, little progress has been made toward enabling related 
capabilities in practical systems which operate mainly based on layer separation principles. This talk will 
address our recent progress toward demonstrating the practical benefits of cross-layer cooperation in wireless 
systems, with a particular focus on mobile video services over LTE Advanced and IEEE 802.16m (both unicast video 
and multicast/broadcast services). We will describe our general technical approach for studying cross-layer 
cooperation, present our results based on simulation and experimental evaluations that demonstrate performance 
enhancements in terms of service capacity and quality of user experience, and summarize future challenges and 
opportunities.