Separating resource reservations from service requests to improve the performance of optical burst-switching networks

Neil Barakat*, Edward H. Sargent

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

25 Scopus citations


In this paper, we introduce a new signalling architecture called Dual-header Optical Burst Switching (DOBS) for next generation burst-switching optical networks. DOBS decouples the resource reservation process from the service request process in core nodes and allows for delayed scheduling to be implemented. This relaxes the constraints on burst scheduling operations and allows the offset sizes of bursts to be precisely controlled in core nodes without the use of fiber delay line buffers. This allows for increased flexibility, control, and performance. To demonstrate the benefit of delayed scheduling and corenode offset control, we examine the performance of a DOBS system in which the offset size of every burst on a core link is set to a constant value. Using simulation and analysis, we show that the resulting constant-scheduling-offset (CSO) system realizes lower ingress delay, higher throughput, and better fairness than conventional single-header OBS systems, while simultaneously requiring only O(1) burst scheduling complexity. In a 16-channel system with full wavelength conversion and no fiber delay line buffers, the CSO DOBS system achieved a blocking probability 50% lower than that of a similar LAUC-VF JET OBS system. The CSO DOBS system also achieved perfect fairness, both with respect to burst length and with respect to the residual path length of bursts.

Original languageEnglish (US)
Pages (from-to)95-107
Number of pages13
JournalIEEE Journal on Selected Areas in Communications
Issue number4
StatePublished - Apr 2006


  • Delayed scheduling
  • Dual-header optical burst switching
  • Optical burst switching
  • Optical networks
  • Signalling architecture

ASJC Scopus subject areas

  • Computer Networks and Communications
  • Electrical and Electronic Engineering


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