WIRELESS BROADBAND ACCESS: WIMAX AND BEYOND - Investigation of Bandwidth Request Mechanisms under Point-to-Multipoint Mode of WiMAX Networks
- 15 May 2007
- journal article
- Published by Institute of Electrical and Electronics Engineers (IEEE) in IEEE Communications Magazine
- Vol. 45 (5) , 132-138
- https://doi.org/10.1109/mcom.2007.358860
Abstract
The WiMAX standard specifies a metropolitan area broadband wireless access air interface. In order to support QoS for multimedia applications, various bandwidth request and scheduling mechanisms are suggested in WiMAX, in which a subscriber station can send request messages to a base station, and the base station can grant or reject the request according to the available radio resources. This article first compares two fundamental bandwidth request mechanisms specified in the standard, random access vs. polling under the point-to-multipoint mode, a mandatory transmission mode. Our results demonstrate that random access outperforms polling when the request rate is low. However, its performance degrades significantly when the channel is congested. Adaptive switching between random access and polling according to load can improve system performance. We also investigate the impact of channel noise on the random access request mechanismKeywords
This publication has 3 references indexed in Scilit:
- WLC22-4: Efficient Request Mechanism Usage in IEEE 802.16Published by Institute of Electrical and Electronics Engineers (IEEE) ,2006
- Performance Analysis of the Random Access in IEEE 802.16Published by Institute of Electrical and Electronics Engineers (IEEE) ,2006
- Energy saving mechanism in the IEEE 802.16e wireless MANIEEE Communications Letters, 2005