Compressed video transmission protocol considering dynamic QoS control

Two variable bit rate transmission schemes are introduced for MPEG compressed video to maintain the video frame constant. We also introduce a dynamic rate control method which consists of both a packet rate control method to reduce the packet loss, and a frame rate control method to maintain the frame rate constant. By combining these variable bit rate schemes with the dynamic rate control method, the user´s QoS for video service can be dynamically controlled even if packets are lost or delayed as a result of increases of CPU loads at the client and video server, or network traffic. We implemented a prototyped packet audio/video system (PAVS) to evaluate the performance of the suggested control functions when client CPU load and network traffic dynamically changed. Through the performance evaluation, the usefulness of our suggested control methods is demonstrated