Transmitting real-time VER traffic with QoS control in a timed token medium access control network

By exploring the characteristics of the Moving Pictures Experts Group (MPEG ) coded frame sequence and the expected quality of service (QoS) of video a pplications, we have designed different transmission strategies for transmi tting real-time VBR videos over a computer network. In this article, we pre sent three MPEG video transmission schemes with the objective of increasing the maximum number of video streams that can be supported by the underlyin g network without sacrificing much on the video quality. Multiple classes o f the MPEG video are examined in this study. These data are captured from r eal video programmes and we categorized these video clips according to thei r traffic burstiness and workload characteristics. The results reveal that, by employing the intentional delay scheme, we could improve the performanc e by 67-166%. In the case of applications, allowing different levels of QoS , the QoS Control Scheme alone can improve the performance by 77 and 112% w hen the QoS level is set to 90 and 60%, respectively. When we combined thes e two schemes together and formed our third scheme, namely the QoS Control with intentional delay, the performance improvement can be: pushed to 271%, which is a dramatic improvement over the default uncontrolled transmission scheme. (C) 1999 Elsevier Science B.V. All rights reserved.