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研究生: 李益豪
論文名稱: 無線網路下的排程:權重式輪循法
Scheduling in wireless networks: a weighted round robin approach
指導教授: 蔡榮宗
學位類別: 碩士
Master
系所名稱: 資訊教育研究所
Graduate Institute of Information and Computer Education
論文出版年: 2002
畢業學年度: 90
語文別: 英文
論文頁數: 97
中文關鍵詞: 權重式輪循法馬可夫串列排程公平性
英文關鍵詞: weighted round robin, Markov chain, scheduling, fairness
論文種類: 學術論文
相關次數: 點閱:176下載:1
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  • 我們提出一種無線環境中下行(downlink)傳輸排程的方法,叫做Error Avoidance Weighted Round Robin(EAWRR)。EAWRR能夠有效地利用無線頻寬並提供有限的公平性。能達到這些特性主要是藉由整合GPS的方法到WRR並加以改進,以保證有效的頻寬利用。此外,EAWRR沒有GPS計算虛擬時間的負擔,整體的實作複雜度更低。另外,由於我們假設系統在傳送封包前不偵測無線傳輸的品質,因此可減少跟基地台間的控制訊息交換,連帶也就節省了移動設備的電力消耗﹔而為了更進一步提高頻寬的使用效率,我們提出了另一個改良機制叫List-Reordering,或簡稱EAWRR-LR。基本上,EAWRR-LR哲學是避免使用有錯誤的無線連結(wireless link),而盡量使用品質好的無線連結。雖然EAWRR主要是設計在下行網路,但未來希望可以應用在上行網路。

    Table of Contents Abstract Table of Contents List of Figures List of Tables Chapter 1 Introduction ……………………………………………1 1.1 Background and Related Works ……………………………1 1.2 Problem Formulation and Objective ……………………6 1.3 Thesis Organization ………………………………………7 Chapter 2 System and Analysis …………………………………9 2.1 System Model …………………………………………………9 2.2 Channel Model …………………………………………….10 2.2.1 Two-State Markov Chain Channel Model ……………10 2.2.2 Channel Memory ……………………………………….12 2.3 Various Weighted Round Robin Disciplines ……………15 2.3.1 Classical Weighted Round Robin ……………………17 2.3.2 Weighted Round Robin spread as PGPS ……………17 2.4 Error Avoidance Weighted Round Robin – EAWRR …….19 2.4.1 Basic Discipline ………………………………………19 2.4.2 Compensation Scheme ……………………………………21 2.4.3 The Effect of Compensation ………………………….25 2.5 Fairness ………………………………………………………27 2.6 Channel Memory Effect and List-Reordering ……………..30 Chapter 3 Simulation and Numeric Result….……………………35 Chapter 4 Conclusion …………………………………………….75 Appendix A ……………………………………………………………77 Appendix B ……………………………………………………………79 References ……………………………………………………………97

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