Ensuring the QoS requirements in 802.16 scheduling
Proceedings of the 9th ACM international symposium on Modeling analysis and simulation of wireless and mobile systems
Multicast polling and efficient voip connections in ieee 802.16 networks
Proceedings of the 10th ACM Symposium on Modeling, analysis, and simulation of wireless and mobile systems
FGCN '07 Proceedings of the Future Generation Communication and Networking - Volume 01
Emergency wireless broadband random access performance analysis with packet retransmission mechanism
International Journal of Internet Protocol Technology
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International Journal of Communication Networks and Distributed Systems
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International Journal of Grid and Utility Computing
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IEEE 802.16 standard suite defines a reservation-based bandwidth allocation mechanism. A SS (Subscriber Station) has to be polled to request bandwidth reservation before transmits uplink data to a BS (Base Station). In this mechanism exist two main polling modes: the unicast polling mode and the contention-based polling mode. The different polling operations in MAC (Medium Access Control) result in different PHY (PHYsical layer) frame structure that deeply affect the performance. Therefore, there should be an optimal scheme to adopt these two polling modes in order to optimize the performance. Although the standard defines five service classes to adaptively use the polling modes to fit the QoS (Quality of Service) requirements of different applications, it does not specify exactly a scheme to adopt these two polling modes efficiently and fairly during the polling process. In~this paper, we investigate the polling mechanisms in IEEE 802.16 networks, and focus the attention on the performance caused by different adoption schemes. We also propose a simple but efficient polling mechanism to optimize the performance. The simulation results verify that the performance is conditioned to the fulfillment of the polling mechanisms and our proposed optimal polling scheme can allocate bandwidth more efficient and achieve better performance.