Traffic Shaping and Scheduling for OBS-based IP/WDM Backbones

Mahmoud Elhaddad, Kami Melhem, Taieb Znati, Debashis Basak

Research output: Contribution to journalConference articlepeer-review

6 Citations (Scopus)


We introduce Proactive Reservation-based Switching (PRS) - a switching architecture for IP/WDM networks based on Labeled Optical Burst Switching. PRS achieves packet delay and loss performance comparable to that of packet-switched networks, without requiring large buffering capacity, or burst scheduling across a large number of wavelengths at the core routers. PRS combines proactive channel reservation with periodic shaping of ingress-egress traffic aggregates to hide the offset latency and approximate the utilization/buffering characteristics of discrete-time queues with periodic arrival streams. A channel scheduling algorithm imposes constraints on burst departure times to ensure efficient utilization of wavelength channels and to maintain the distance between consecutive bursts through the network. Results obtained from simulation using TCP traffic over carefully designed topologies indicate that PRS consistently achieves channel utilization above 90% with modest buffering requirements.

Original languageEnglish
Pages (from-to)357-368
Number of pages12
JournalProceedings of SPIE - The International Society for Optical Engineering
Publication statusPublished - 2003
Externally publishedYes
EventOptiComm 2003: Optical Networking and Communications - Dallas, TX, United States
Duration: Oct 13 2003Oct 17 2003


  • Optical burst switching
  • Performance evaluation
  • TCP
  • WDM networks

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Computer Science Applications
  • Applied Mathematics
  • Electrical and Electronic Engineering


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