Joint rate control and scheduling for video streaming over OFDMA networks

In this paper, we investigate joint rate control and packet scheduler for video streaming over downlink orthogonal frequency division multiple access (OFDMA) networks. We proposed algorithm which exploits rate based utility functions and the video packet´s importance information which is related to its position in the group of pictures. The time scale of rate control is larger than that of packet scheduler. The importance information for scheduling is embedded in the IP packets, making it more suitable for practical purposes. We extend the Lyapunov optimization technique for single time scale network to develop a low complexity algorithm, which does not require prior statistical information on the channel and queues. The algorithm also has a bounded worst case delay, which is useful for incorporating deadline constraints for video streaming. The performance of the proposed algorithm is evaluated by simulation in a LTE network. Simulation results show that our algorithm outperforms existing techniques.