Dynamic scheduling with reconfiguration delays

G. Celik, S. C. Borst, P. A. Whiting*, E. Modiano

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

13 Citations (Scopus)

Abstract

We consider scheduling in networks with interference constraints and reconfiguration delays, which may be incurred when one service schedule is dropped and a distinct service schedule is adopted. Reconfiguration delays occur in a variety of communication settings, such as satellite, optical, or delay-tolerant networks. In the absence of reconfiguration delays it is well known that the celebrated Max-Weight scheduling algorithm guarantees throughput optimality without requiring any knowledge of arrival rates. As we will show, however, the Max-Weight algorithm may fail to achieve throughput optimality in case of nonzero reconfiguration delays. Motivated by the latter issue, we propose a class of adaptive scheduling algorithms which persist with the current schedule until a certain stopping criterion is reached, before switching to the next schedule. While earlier proposed Variable Frame-Based Max-Weight (VFMW) policies belong to this class, we also present Switching-Curve-Based (SCB) policies that are more adaptive to bursts in arrivals. We develop novel Lyapunov drift techniques to prove that this class of algorithms under certain conditions achieves throughput optimality by dynamically adapting the durations of the interswitching intervals. Numerical results demonstrate that these algorithms significantly outperform the ordinary Max-Weight algorithm, and that SCB policies yield a better delay performance than VFMW policies.

Original languageEnglish
Pages (from-to)87-129
Number of pages43
JournalQueueing Systems
Volume83
Issue number1-2
DOIs
Publication statusPublished - 1 Jun 2016

Keywords

  • Max-Weight algorithm
  • Reconfiguration
  • Scheduling
  • Stability
  • Switching delay
  • Throughput optimality

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