Research output: Contribution to Journal/Magazine › Journal article › peer-review
Research output: Contribution to Journal/Magazine › Journal article › peer-review
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TY - JOUR
T1 - Investigation of bandwidth request mechanisms under point-to-multmipomint mode of WiMAX networks
AU - Ni, Qiang
AU - Vinel, Alexey
AU - Xiao, Yang
AU - Turlikov, Andrey
AU - Jiang, Tao
PY - 2007
Y1 - 2007
N2 - 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 mechanism.
AB - 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 mechanism.
KW - Aerospace electronics
KW - Algorithm design and analysis
KW - Bandwidth
KW - Media Access Protocol
KW - Multiaccess communication
KW - Performance analysis
KW - Portable media players
KW - Resource management
KW - Scheduling algorithm
KW - WiMAX
U2 - 10.1109/MCOM.2007.358860
DO - 10.1109/MCOM.2007.358860
M3 - Journal article
VL - 45
SP - 132
EP - 138
JO - IEEE Communications Magazine
JF - IEEE Communications Magazine
SN - 0163-6804
IS - 5
ER -