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

Xiaoqing Zhu, Thomas Schierl, Thomas Wiegand, Bernd Girod
2011 IEEE transactions on circuits and systems for video technology (Print)  
A unified optimization framework for rate allocation among multiple video multicast sessions sharing a wireless network is presented. Our 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. Our system model explicitly accounts for heterogeneity in wireless link capacities, traffic contention among neighboring links, as well
more » ... different video rate-distortion (RD) characteristics. The proposed distributed rate allocation scheme leverages cross-layer information exchange between the MAC and application layers to achieve fast convergence at the optimal, media-aware allocation. Performance of the proposed media-aware rate allocation protocol is compared against a heuristic scheme based on TCP-Friendly Rate Control (TFRC). In network simulations of standard-definition (SD) video streaming over single or multiple multicast trees, the proposed scheme consistently achieves higher overall video quality than the TFRCbased heuristics. When delivering scalable streams, the flexibility of perpeer rate adaptation inside each multicast tree yields a further slight improvement in overall video quality over multicast of non-scalable streams. Index Terms-video multicast, wireless 802.11 networks, scalable video coding (SVC), distributed rate allocation, cross-layer design X. Zhu and B. Girod are with the
doi:10.1109/tcsvt.2011.2129690 fatcat:amrofrpfpffbpd5vj3ycofzowy