臺灣博碩士論文加值系統

在無線整合環境中，多重擷取層規約的服務品質保證是許多研究的重心。
本論文首先針對VBR服務在不同的頻寬配置方式下，延遲變異的變化，進行討論，並對一個通用的框架結構下，VBR連結的封包服務品質，進行排隊模型的近似與推導。
此外，在行動通訊環境中，用戶的移動衍生出的交遞(handoff)行為，在多重擷取層的效能分析研究中並不常見。在此，本論文利用一個簡單的馬可夫鏈，代表用戶的移動狀態，並依此建構出雙態的伺服器模型。
首先從最基本的硬性交遞(hard handoff)模型開始，以一個整批服務的排隊系統，計算出VBR封包延遲的平均值和變異數。接著延伸至軟性交遞(soft handoff)的環境之中，以類似的數學流程，計算出封包的服務品質，同時也對交遞失敗的假設，進行數學的估算。以一個三態的伺服器加入考慮用戶交遞失敗的狀態，計算出相關的性能參數。
最後，在假設基地台可以參照連結佇列大小，進而動態配置頻寬的環境下，同樣利用雙態伺服器代表用戶的移動情形，計算出封包的平均延遲和封包延遲變異。

第一章 緒論 1
1.1 研究背景 1
1.2 多重擷取層規約與可變位元速率服務 3
1.3 簡介交遞現象及相關研究回顧 4
1.4 研究動機 7
1.5 論文架構 8
第二章 基本多重擷取層效能分析 9
2.1 .環境簡介與系統設定 9
2.2 封包虛擬服務時間 10
2.3 封包離開系統時間與延遲變異 12
2.4 數值分析與討論 15
2.5 虛擬服務時間修正 19
第三章 硬性交遞分析 25
3.1 .環境簡介與系統設定 25
3.2 基本hard handoff 排隊模型 26
3.3 框架標頭上的佇列分布 29
3.4 封包抵達系統時點上的佇列分布 36
3.5 雙態伺服器對封包延遲的影響 38
3.6 延遲變數的推導 40
3.7 結論 42
3.8 數值分析與討論 43
第四章 軟性交遞分析 49
4.1 環境簡介與系統設定 49
4.2 Soft handoff 排隊模型 51
4.3 框架標頭上的佇列分布 53
4.4 封包抵達系統時點上的佇列分布 58
4.5 延遲變數的推導 59
4.6 數值分析與討論 64
4.7 交遞失敗率假設的討論 72
第五章 下傳鏈路效能分析與動態頻寬配置 79
5.1 環境簡介與系統設定 79
5.2 動態頻寬配置模型 81
5.3 框架標頭上的佇列分布 83
5.4 封包延遲的推導 89
5.5 時槽式下傳鏈路環境 95
第六章 結論 99

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