UHD video transmission using adaptive SHVC in wireless networks
Scalable extension of High Efficiency Video coding (SHVC) is an ideal candidate for delivering Ultra High Definition (UHD) content to heterogeneous clients. In this work we propose a system architecture to deliver UHD content adaptively based upon bandwidth and end user device specifications over wireless network. For the adaptive transmission we need a Parametric rate model for bit rate adaptation. Hence, we study the effect of quantization, frame rate, and spatial resolution on bit rate in order to develop a Parametric rate model for SHVC videos. The rate model is developed in terms of quantization step size, frame rate, and spatial resolution. It is observed that the model fits into measured data with high Pearson Correlation. The rate model helps in deciding the quantization parameter, frame rate, and spatial resolution for the given bandwidth conditions so as to improve the user experience. The receiver sends the channel conditions and device capabilities (like device resolution support and processing power) to the transmitter. Based on this, the transmitter adaptively changes the transmitted bit stream. The overall system performance is evaluated in terms of the PSNR of the transmitted and received video sequence.