臺灣博碩士論文加值系統

　　在IEEE 802.16e 標準所規範的無線都會網路，當行動台距離基地台較遠或位於通訊不良的涵蓋範圍時，可改用較強健的調變技術，但資料率會因此降低。因此在IEEE 802.16j標準中建議在基地台的涵蓋範圍內佈建中繼站，行動台可透過中繼方式提高傳送速率。為了提供不同服務等級的服務流不同的服務品質保證，適當的頻寬分配法則對於網路服務品質之保證是有必要的。而適當的頻寬分配法則使用在允入控制時可以確保網路中不會同時存在太多訊務而導致系統資源不足，因此有效掌握訊務的需求以及系統的可用資源是允入控制的基礎。
　　在佈建固定式中繼站的IEEE 802.16j環境下，本論文提出具通道感知頻寬調整(Channel-Aware Bandwidth Adaptation, CABA)法則。藉由考量通道品質的優劣作為允入控制的決策參考，稱為具通道感知頻寬調整之允入控制(Channel-Aware Bandwidth Adaptation-Call Admission Control, CABA-CAC)法則，使建立的連線依據現有的通道品質搭配適當的頻寬，提升傳送速率。而通道品質是隨時在改變的，因此適時的為連線進行頻寬使用最佳化之調整，我們提出一個具通道感知頻寬調整之最佳頻寬利用(Channel-Aware Bandwidth Adaptation-Optimum Bandwidth Utilization, CABA-OBU)法則，可提高系統流通量。模擬結果顯示在系統達到飽和時，本論文所提出的CABA-CAC與CABA-OBU法則與不考量通道之動態分配頻寬法相較，降低了23.5%~29.4%的連線阻塞機率，同時增加了15.2%~22.9%的流通量。

摘　要 I
誌 謝 II
目　錄 III
圖　目　錄 IV
表　目　錄 VI
第一章　簡介 1
1.1　動機 3
1.2　目的 3
1.3　相關工作 3
1.4　論文組織 6
第二章　IEEE 802.16無線都會網路簡介 7
2.1　系統架構 7
2.2　實體層 7
2.2.1　訊框架構 8
2.2.2　上鏈控制通道 10
2.3　媒體存取控制層 11
2.3.1　初始化過程 11
2.3.2　初始測距與週期測距 13
2.3.3　物件模型之對照關係 14
2.3.4　IEEE 802.16e QoS架構 17
第三章　跨層級的頻寬調整法則 19
3.1　跨層級資源分配之原理 19
3.2　具通道感知頻寬調整(CABA)法則 21
3.2.1　CABA法則之系統架構 24
3.2.2　平均訊號強度計算器 26
3.2.3　允入控制 28
3.2.4　最佳化頻寬使用率 31
3.3　CABA法則之流程圖 33
第四章　效能評估 38
4.1　模擬環境與參數 38
4.2　模擬結果與討論 44
第五章　結論 55
參考文獻 58

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