Efficient Cross-Layer Error Control for Wireless Video Multicast

In this paper we develop cross-layer schemes combining source rate selection, power management, and error control for wireless multicast of SNR scalable video. In particular, two error control schemes are analysed and compared. The first one, type 2 hybrid ARQ/FEC, is based on incremental redundancy chosen to recover losses and provide the required level of video quality. The second one, called noncausal error control, relies on error concealment from future video data whose quality is adaptively adjusted to bring the video quality up to the desired level for all users. Our results indicate that noncausal error control can be significantly more efficient than type 2 hybrid ARQ/FEC.