A scheduling algorithm with MAP multiplexing in IEEE 802.16 mobile multi-hop relay
Mobility '08 Proceedings of the International Conference on Mobile Technology, Applications, and Systems
A Multi-channel QoS Model for Random Access Systems
CNSR '09 Proceedings of the 2009 Seventh Annual Communication Networks and Services Research Conference
Service differentiation in OFDM-based IEEE 802.16 networks
EURASIP Journal on Wireless Communications and Networking - Special issue on OFDMA architectures, protocols, and applications
Proceedings of the 12th ACM international conference on Modeling, analysis and simulation of wireless and mobile systems
Wireless Personal Communications: An International Journal
Scheduling in IEEE 802.16e Mobile WiMAX networks: key issues and a survey
IEEE Journal on Selected Areas in Communications - Special issue on broadband access networks: Architectures and protocols
Performance improvement by efficient polling in WiMAX network
ISWPC'09 Proceedings of the 4th international conference on Wireless pervasive computing
Efficient polling mechanism in WiMAX network
WCNC'09 Proceedings of the 2009 IEEE conference on Wireless Communications & Networking Conference
An integrated WiMAX/WiFi architecture with QoS consistency over broadband wireless networks
CCNC'09 Proceedings of the 6th IEEE Conference on Consumer Communications and Networking Conference
A Gibbs sampling based MAP detection algorithm for OFDM over rapidly varying mobile radio channels
GLOBECOM'09 Proceedings of the 28th IEEE conference on Global telecommunications
An adaptive distributed scheduling scheme for IEEE 802.16j networks
Proceedings of the 6th International Wireless Communications and Mobile Computing Conference
WiMax quality-of-service estimations and measurement
Computer Communications
Computers and Electrical Engineering
An efficient scheduling algorithm for radio resource reuse in IEEE 802.16j multi-hop relay networks
Computers and Electrical Engineering
Efficient Quality of Service scheduling mechanism for WiMAX networks
Computer Communications
A new adaptive model for throughput enhancement and optimal relay selection in IEEE 802.16j networks
WSEAS TRANSACTIONS on COMMUNICATIONS
Performance analysis of IEEE 802.16 networks with MMPP arrivals
Performance Evaluation
Journal of Network and Computer Applications
International Journal of Communication Systems
Journal of Network and Computer Applications
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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