Distributed Media-Aware Rate Allocation for Video Multicast Over Wireless Networks

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A unified optimization framework for rate allocation among multiple video multicast sessions sharing a wireless network is presented. The authors' framework applies to delivery of both scalable and non-scalable video streams. In both cases, the optimization objective is to minimize the total video distortion of all peers without incurring excessive network utilization. Their system model explicitly accounts for heterogeneity in wireless link capacities, traffic contention among neighboring links, as well as different video Rate-Distortion (RD) characteristics. The proposed distributed rate allocation scheme leverages cross-layer information exchange between the media access control and application layers to achieve fast convergence at the optimal, media-aware allocation.