Abstract-We consider a wide-area video conferencing application where the video sources adapt their send rates according to the available bandwidth in the network paths. We advocate a QoE-aware cooperative rate control of the sources to relieve the congestion, instead of running multiple (independent) instances of a singlesource adaptation algorithm in a QoE-oblivious manner and additively superposing their results. Our paper focuses on the architecture of such a QoE-aware video multicast system. Dove-tailed to the core functionality of rate adaptation is the session-layer configuration control mechanisms to deliver video to various end-user devices
