| Summary: | 碩士 === 國立交通大學 === 網路工程研究所 === 95 === The IEEE 802.16(d) standard (also known as WiMAX) is a promising technology for future fixed broadband wireless access (FBWA) systems. There are two operation modes defined in this standard. First, the point-to-multipoint (PMP) mode aims to replace the traditional wired last-mile solutions. Second, the Mesh mode is designed for the next-generation wireless metropolitan area networks (Wireless-MANs). In the 802.16 Mesh mode, network resource allocation can be handled in the centralized and distributed scheduling modes.
In the distributed scheduling mode, the minislot utilization is essential to achieving good performances of MAC-layer scheduling. In this thesis, we propose a novel MAC-layer scheduling scheme, named “the slicing-based scheme,” to improve network utilization. Besides, it can be used to provide better soft-QoS support. Both the multi-grant and multi-request mechanisms in this scheme are proposed and their performances are compared against those of the original scheme.
Our simulation results show that the slicing-based scheme significantly increases the MAC-layer minislot utilization. Thus, it generates good application performances and decreases the packet delay. In addition, our proposed scheme can better provide soft-QoS support.
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