This report discusses the design of cross-layer protocols for the transmission of delay-sensitive and prioritized data in wireless networks; these protocols consider the QoS issues in an end-to-end fashion and collaboratively design protocols at different network layers. First, a novel cross-layer scheme is discussed which minimizes the expected received video distortion by jointly optimizing the packet sizes at the application (APP) layer and estimating their forward error correction (FEC) code rates to be allocated at the physical (PHY) layer for bit-rate limited and noisy channels. Second, a crosslayer FEC scheme is discussed, which jointly optimizes the Raptor codes at APP layer and rate compatible punctured convolutional (RCPC) codes at PHY layer for the prioritized video packets, in order to minimize the distortion for the given source bit rates and channel constraints. Finally, a video slice CMSE and deadline-aware sliding-window based scheduling algorithm is designed, which exploits the temporal and SNR scalability of a H.264/SVC compressed bit stream for transmission over a wireless link with time-varying bit rate.
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