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

Joseph K Y NG*, V. C.S. Lee

*Corresponding author for this work

Research output: Contribution to journalJournal articlepeer-review

1 Citation (Scopus)


By exploring the characteristics of the Moving Pictures Experts Group (MPEG) coded frame sequence and the expected quality of service (QoS) of video applications, we have designed different transmission strategies for transmitting real-time VBR videos over a computer network. In this article, we present three MPEG video transmission schemes with the objective of increasing the maximum number of video streams that can be supported by the underlying network without sacrificing much on the video quality. Multiple classes of the MPEG video are examined in this study. These data are captured from real video programmes and we categorized these video clips according to their traffic burstiness and workload characteristics. The results reveal that, by employing the intentional delay scheme, we could improve the performance 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% when the QoS level is set to 90 and 60%, respectively. When we combined these 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.

Original languageEnglish
Pages (from-to)930-941
Number of pages12
JournalComputer Communications
Issue number10
Publication statusPublished - 25 Jun 1999

Scopus Subject Areas

  • Computer Networks and Communications


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