Performance Optimization with Efficient Polling Mechanism in IEEE 802.16 Networks with Cross-Layer Consideration |
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Authors: | Fei Yin Guy Pujolle Jong Hyuk Park Han-Chieh Chao |
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Affiliation: | 1.LIP6, University Paris 6,Paris,France;2.L2TI, Institut Galilée, University Paris 13,Villetaneuse,France;3.Department of Computer Science and Engineering,Kyungnam University,Masan, Kyungnam,Korea;4.College of Electrical Engineering and Computer Science,National Ilan University,I-Lan,Taiwan, ROC |
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Abstract: | 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. |
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