Improvement to fairness algorithm of resilient packet ring network

Wenli Tang, Liren Zhang, Songnian Fu, P. Shum, Shuang Liu

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


Resilient Packet Ring (RPR) is a more promising solution to the bottleneck of metropolitan-area networks (MANs). The ring network architecture and associated protocol has been standardized by the IEEE 802.17 working group in 2004. To achieve high bandwidth utilization, optimum spatial reuse and fairness simultaneously, a policy of fair bandwidth assignment must be implemented in current RPR network. The existing fairness mechanisms suffer from severe oscillations under certain conditions, such as unbalanced traffic scenario and noticeable time delay. With our proposed fairness algorithm, the system performance of the three-node unbalanced traffic scenario, where the traffic loads are fixed, can be sustained by simply adjusting the compensating factor with respect to the time delay. In this paper, the time delay is constant, we investigate how this compensating factor should be adjusted with respect to the degree of unbalance. Furthermore, we study a four-node scenario, each node-to-node pair has different time-delay as well as unbalance degree. The simulation results show that the system performance remains excellent with the guidelines summarized.

Original languageEnglish
Title of host publicationBroadband Access Communication Technologies
Publication statusPublished - 2006
Externally publishedYes
EventBroadband Access Communication Technologies - Boston, MA, United States
Duration: Oct 2 2006Oct 3 2006

Publication series

NameProceedings of SPIE - The International Society for Optical Engineering
ISSN (Print)0277-786X


OtherBroadband Access Communication Technologies
Country/TerritoryUnited States
CityBoston, MA


  • Fairness algorithm
  • Metropolitan Area Network (MAN)
  • Resilient Packet Ring (RPR)
  • Time delay
  • Unbalanced traffic scenario

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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