Delay Constrained Self Congestion Control for FGS Video Streams

Real-time video streaming over the Internet often suffers from a kind of congestion on the bottleneck links caused by the video stream itself, a phenomenon so called self congestion. The motion compensation based video coding algorithms make video streams of variable bit-rate nature, which cause burst traffic, extra transmission delay, and even queue overflow of the bottleneck link and video data loss at the receiver thereafter. This makes self-congestion control a necessity for streaming video. In this paper, a sender-side optimized congestion control scheme for MPEG-4 fine granularity scalable (FGS) coding video stream is proposed. The scheme not only attempts to minimize the received video distortion at the receiver side, but also tries to maintain a smooth transmission rate in the network. The simulation results show the effectiveness of the proposed scheme in terms of the received video quality, the smoothness of video transmission rate, and the variance of the size of the bottleneck queue.