Advance bandwidth scheduling in software-defined networks

Poonam Dharam, Chase Q. Wu, Nageswara S.V. Rao

Research output: Chapter in Book/Report/Conference proceedingConference contribution

2 Scopus citations


In software-defined networks (SDNs) with multiple logically centralized controllers, it is challenging to maintain accurate link-state information, perceived as a global network view (GNV), at every controller in a consistent manner. Since online bandwidth scheduling, where every successful reservation triggers a GNV update at the controller, is expensive in terms of overhead, most networks adopt periodic scheduling with infrequent link-state information update, which, however, is the main cause of such inaccuracy/inconsistency. Even if up-to-date information is available, a controller does not always make frequent updates as it may cause network convergence issues. Consequently, bandwidth scheduling in such environments may lead to blocking or rejection of reservation requests, which deteriorates as the level of inaccuracy/inconsistency increases. To minimize such service disruptions, we formulate bandwidth scheduling in SDNs as an optimization problem and propose a randomization-based routing scheme to schedule bandwidth reservation requests such that the total number of blocked requests due to the inaccurate/inconsistent GNV is minimized. Simulation results show that the proposed solution exhibits a superior performance over existing methods.

Original languageEnglish (US)
Title of host publication2015 IEEE Global Communications Conference, GLOBECOM 2015
PublisherInstitute of Electrical and Electronics Engineers Inc.
ISBN (Electronic)9781479959525
StatePublished - Jan 1 2015
Event58th IEEE Global Communications Conference, GLOBECOM 2015 - San Diego, United States
Duration: Dec 6 2015Dec 10 2015

Publication series

Name2015 IEEE Global Communications Conference, GLOBECOM 2015


Other58th IEEE Global Communications Conference, GLOBECOM 2015
Country/TerritoryUnited States
CitySan Diego

All Science Journal Classification (ASJC) codes

  • Computer Networks and Communications
  • Electrical and Electronic Engineering
  • Communication


  • Bandwidth scheduling
  • Path computation
  • Software-defined networks


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