IEEE 802.16網狀網路模式為第四代熱門的網路技術之一，同時被期待能提供多媒體應用服務的服務品質保證。然而，目前對於頻道資源的分配和保留，802.16的標準中尚未規範。本篇論文依據不同的優先權，提出MAC中具服務品質之協同分散式排程，達成服務品質的需求。對VoIP流量而言，調整延遲時間演算法減低平均延遲3.97%以及增加其產出達2.44%。同樣地，分配資料時段演算法降低平均延遲 13.7%，同時增加產出14.89%。動態調整延遲時間演算法縱合調整延遲時間演算法和分配資料時段演算法的優點，並考量無線頻帶上的使用率，不但降低VoIP流量平均延遲5.09%和增加產出4.17%，同時僅損失整體產出0.09%。因此動態地調整延遲時間演算法不僅達成服務區別的需求，還維持良好的整體產出。 The 802.16 mesh mode is one of the hot technologies for fourth-generation (4G) and is expected QoS guaranteed for multimedia services. The standard, however, are still left undefined for channel resources allocation and reservation management. The thesis propose QoS Coordinated Distributed Scheduling (QC-DSCH) based on prioritization to accomplish the QoS requirement on MAC layer. The proposed adjusting hold-off time algorithm reduces the average inter-arrival delay 3.97% in average and increase throughput 2.44% for the VoIP traffic. The proposed allocation mini-slots algorithm reduces the average inter-arrival delay 13.7% in average and increase the VoIP throughput 14.89% in average for the VoIP traffic. The proposed dynamic hold-off time employs the hybrid advantages of adjusting hold-off time and allocation mini-slots. It takes the utilization of channel into account. It reduces the average inter-arrival delay time 5.09% and increase the throughput 4.17% for the VoIP traffic. Meanwhile, it only sacrifices 0.09% overall throughput. Thus, the proposed dynamic hold-off time could achieve service differentiation and keep the high performance for overall throughput.
