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研究生:陳俊秀
研究生(外文):Chun-Hsiu Cheng
論文名稱:於IEEE 802.16e 網路上使用ECQ機制以改善資源分配之效率
論文名稱(外文):Enhanced CAC with QoS Scheme for Improving the Efficiency of Resource Allocation on the IEEE 802.16e Network
指導教授:楊欣哲楊欣哲引用關係
指導教授(外文):Shin-Jer Yang
學位類別:碩士
校院名稱:東吳大學
系所名稱:資訊管理學系
學門:電算機學門
學類:電算機一般學類
論文種類:學術論文
論文出版年:2011
畢業學年度:99
語文別:中文
論文頁數:52
中文關鍵詞:IEEE 802.16eECQ服務品質(QoS)允入控制(CAC)
外文關鍵詞:IEEE 802.16eECQQoSCAC
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在 IEEE 802.16e 網路中定義了五種不同高低優先權的服務類別(Service Type)來滿足服務品質的需求,分別為UPS、ertPS、rtPS、nrtPS、BE。但系統標準並未對頻寬管理、允入控制(Call Admission Control, CAC)、排程法則(Scheduling)提出有效的方法,因此,一個適合可行的頻寬分配演算法,將是非常重要的。首先,用戶端(SS)在傳送資料前必須先向基地台(BS)傳送連線請求,待分配到頻寬之後才可上傳資料。實際上,基地台使用允入控制(CAC)方法,判斷是否有足夠的頻寬以來服務新的連線。當用戶端數量增加時,相對地傳送連線請求的次數亦隨之增加。實際上,CAC是依序分配頻寬,可能無法滿足服務品質的需求。本論文於IEEE 802.16e PMP 模式下改善CAC方法,我們提出以服務品質為基礎的允入控制方法,稱之為 ECQ。ECQ的主要功能是讓不同服務類別的連線請求達到有效率之頻寬分配,以提高網路的傳輸效率與系統流通量(Throughput)。我們將使用QualNet進行模擬實驗,其實驗結果顯示連線阻斷率(CBP) 降低約18.15%,與Packet Delivery Ratio平均提升幅度為16.67%,封包的接收總數比CAC亦提升了29.2%。總之,本論文所提出之ECQ方法於IEEE 802.16e網路上確實可改善CAC中產生資源被某一種服務類別佔用的問題,以及獲得更好的處理績效及QoS的保證。
Five service types with different priorities are defined to meet the QoS needs for different users, there are UGS, ertPS, rtPS, nrtPS, and BE on the IEEE 802.16e network. However, the standard does not propose including the method for bandwidth management, Call Admission Control (CAC), and Scheduling. Therefore, a feasible bandwidth allocation algorithm will be very important. First, SS has to send connection request to BS before it is ready to transmit data. Then, SS can be allowed to transmit data while holding the allocated bandwidth from BS. Actually, BS utilizes CAC to identify whether enough bandwidth to serve the new connection requests from SS or not. When the numbers of SS are increasing, the more requests in bandwidth are higher. However, the CAC is to allocate bandwidth in sequence, it may not satisfy the QoS demand. Based on conventional CAC, we propose an enhanced CAC with QoS scheme, called ECQ, to support efficient bandwidth allocation for connection requests of different service types on the IEEE 802.16e PMP mode. Hence, we use QualNet tool to perform some experiments, simulation results indicate that the proposed ECQ scheme can obtain lower Call Blocking Probability (CBP) about 18.15% and higher Packet Delivery Ratio and Total Packets Received about 16.67% and 29.2% than CAC. Finally, the goals of proposed ECQ are to fix the CAC issue that resource is hold by a specified service type and to achieve better performance and QoS guarantee on the IEEE 802.16e network.
摘 要 iv
Abstract v
目 錄 vi
表目錄 viii
1. 緒論 1
1.1研究背景 1
1.2研究目的 1
1.3章節結構說明 2
2. IEEE 802.16e無線網路基本介紹 4
2.1 系統架構 4
2.2 IEEE 802.16e MAC層 6
2.2.1通訊協定層架構 6
2.2.2物件模型之對照關係 8
2.3 IEEE 802.16e 網路QoS的運作 10
2.3.1 IEEE 802.16e 網路QoS 架構 10
2.3.2 IEEE 802.16e QoS 類別 12
2.4 CAC之相關研究 14
3. ECQ之運作程序與設計原理 17
3.1 ECQ的運作程序 17
3.1.1 Traffic Classifier 18
3.1.2 Dispatcher 19
3.1.3 CAC Decision Engine 20
3.2 ECQ機制設計及演算法 23
4. 模擬實驗與結果分析 28
4.1 模擬環境規劃 28
4.2 衡量的關鍵績效指標 29
4.3 實驗結果之評估分析 32
5. 結論 36
6. 參考文獻 38
附錄一:ECQ 主要的相關原始程式碼 41
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