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Performance Analysis of Contention Based Bandwidth Request Mechanisms in WiMAX Networks

Research output: Contribution to journalJournal article


  • Qiang Ni
  • Ling Hu
  • Alexey Vinel
  • Yang Xiao
  • Marios Hadjinicolaou
Journal publication date12/2010
JournalIEEE Systems Journal
Number of pages10
Original languageEnglish


WiMAX networks have received wide attention as they support high data rate access and amazing ubiquitous connectivity with great quality-of-service (QoS) capabilities. In order to support QoS, bandwidth request (BW-REQ) mechanisms are suggested in the WiMAX standard for resource reservation, in which subscriber stations send BW-REQs to a base station which can grant or reject the requests according to the available radio resources. In this paper we propose a new analytical model for the performance analysis of various contention based bandwidth request mechanisms, including grouping and no-grouping schemes, as suggested in the WiMAX standard. Our analytical model covers both unsaturated and saturated traffic load conditions in both error-free and error-prone wireless channels. The accuracy of this model is verified by various simulation results. Our results show that the grouping mechanism outperforms the no-grouping mechanism when the system load is high, but it is not preferable when the system load is light. The channel noise degrades the performance of both throughput and delay.