We have over 12,000 students, from over 100 countries, within one of the safest campuses in the UK


93% of Lancaster students go into work or further study within six months of graduating

Home > Research > Publications & Outputs > Performance Analysis of Contention Based Bandwi...
View graph of relations

« Back

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
Journal number4
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.