LAUSR

Provisioning multiple statistical QoS for real-time scalable video streaming over wireless fading channels is addressed in this article. A traffic rate adaptation (TRA) strategy is presented to minimize the video quality variation while keeping satisfactory average video quality by selectively delivering encoding layers of video streaming depending on dynamic channel conditions. The QoS-guaranteed TRA policy optimization is formulated based on Markov decision processes. A vector-composed policy gradient algorithm that combines gradient estimate and stochastic approximation is developed to solve the constrained mean-variance optimization problem online. It is attractive for online control and optimization with high computational efficiency and adaptability to unknown environments. Simulation results show the effectiveness of the presented strategy.