A Joint Rate and Buffer Control Scheme for Video Transmission over LTE Wireless Networks

摘要

In wireless communication systems, the quality of time-varying wireless channels and limited resources, make video transmission very challenging. In order to play video frequently, this paper proposes a novel method of QoE (Quality of Experience)-aware video transmission optimization algorithm over LTE networks by jointly controlling the transmission rate and playback buffer management to reduce the probability of video playback interruptions and adapt to constantly changing network status effectively. In order to calculate QoE more accurately and meet user's requirements, this paper also proposes an improved QoE calculation model based on ITU-TP.1201, which considers video bitrate, playback interruption duration, number of playback interruptions, buffer overflow duration, and number of buffer overflows. The experimental results demonstrate that the proposed method can reduce the probability of video playback interruptions and video frame skipping under the finite resource constraints and varying network status more effectively compared with an existing algorithm, thus improving the QoE of video streaming.