QTS: A QOS-guaranteed transport system for broad-band multimedia communications

Maria C. Yuang*, Jen C. Liu

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

1 Scopus citations


-In this paper, we propose a quality-of-service (QOS)guaranteed transport system (QTS), which offers various QOS's at the transport layer for broad-band multimedia communications. The QTS, composed of a bandwidth allocator and a transport protocol module, supports three classes of applications requiring different bit rates, delay sensitivity, and loss sensitivity. The bandwidth allocator intelligently manages the allocation of transport-layer bandwidth at the expense of imposing inevitable blocking of delay-sensitive application connections. The transport protocol module of the QTS performs rate-based flow control for delay-sensitive applications based on transfer rates predetermined by the bandwidth allocator. In addition, the module accomplishes error control only for loss-sensitive applications. As a result, as will be shown, by providing guaranteed rates and reducing the error control overhead, the QTS offers satisfactory bounded delays and jitters for delay-sensitive applications, while incurring minimal throughput degradation for loss-sensitive applications. Finally, we demonstrate the superiority of the QTS over transmission control protocol (TCP) via simulation results in terms of maximum and mean system delays and delay jitter.

Original languageEnglish
Pages (from-to)69-77
Number of pages9
JournalIEEE Transactions on Industrial Electronics
Issue number1
StatePublished - 1 Dec 1998


  • Bandwidth allocation
  • Broad-band multimedia communications
  • Mpeg-i and mpeg-ii encoding
  • Quality of service
  • Rate-based flow control
  • Transmission control protocol
  • Window-based flow control

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