在有限的無線頻寬資源下，提高頻譜效率及有效利用系統資源，是無線通訊系統的關鍵問題。同時未來通訊系統中將是以多訊務類別為主，對於不同型態的訊務其所要求的QOS服務品質亦不相同。因此除了傳輸頻寬之外，服務品質保證亦是在設計系統架構時的主要的考量之一。在本文中，我們介紹了相關的排程法則，和提出應用於移動無線都會區域網路系統(Wireless Metropolitan Area Network)下的MIMO-OFDM系統MAC層架構，包括允入控制法則以及排程法則，在允入控制法則中，若在滿足目前系統所服務的QOS的範圍內則允許用戶進入，至於排程法則採動態混和式的架構，使用WRR分配頻寬給即時訊務，NRT-VR訊務，BE訊務。再用無線排程機制MLWDF法則，PF法則對各自類別的封包做即時性的排程。 Because of limitation of bandwidth, to efficiently utilize the system's frequency resources is the key questions of wireless communication system. In the future, the communication system will support various traffic services. Each traffic service needs different levels of QoS. In addition to data transmission rate, QoS guarantee is also the main consideration of developing a MIMO-OFDM communication system. In this thesis, we introduce related schedule algorithms, and propose a MAC layer structure in a MIMO-OFDM system .It can be applied to mobile wireless metropolitan area networks. Our proposed scheme includes connection admission control mechanism and schedule algorithms. With our proposed CAC mechanism, new users are permitted to enter system if only new and old user’s QoS demands can be both satisfied. And our proposed schedule algorithm uses WRR to assign bandwidth to different schedule algorithms first. After that the MLWDF schedules real-time traffic service packets, and the PF schedules non-real-time traffic service packets.
