Scheduling and buffer management for soft-real-time VBR traffic in packet-switched networks

Ian R. Philp, Klara Nahrstedt, Jane W S Liu

Research output: Contribution to journalConference articlepeer-review


This paper describes four scheduling algorithms and two packet-dropping algorithms for transmitting soft-real-time variable-bit-rate traffic in a packet-switched network. Simulation results show that the first-come-first-serve algorithm, which is equivalent to the earliest-deadline-first algorithm when all packets have equal relative deadlines, outperforms the timed-token algorithm as well as two other real-time scheduling algorithms. We also simulated the last-in-first-discard (LIFD) algorithm as well as a more complex (1, k) packet-dropping algorithm which, for each stream, tries to drop no more than 1 packet in any sequence of k packets. We found that although the (1, k) dropping algorithm does significantly reduce the failure rate, the same reduction in this failure rate can be achieved by slightly lowering the network utilization and using the simpler LIFD algorithm.

Original languageEnglish (US)
Pages (from-to)143-152
Number of pages10
JournalConference on Local Computer Networks
StatePublished - 1996
EventProceedings of the 1996 21st Conference on Local Computer Networks - Minneapolis, MN, USA
Duration: Oct 13 1996Oct 16 1996

ASJC Scopus subject areas

  • Software
  • Electrical and Electronic Engineering


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