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研究生: 徐佑鈞
Yu-chun Hsu
論文名稱: 在LTE環境下結合服務品質與經驗品質之資源分配研究
A Resource Allocation Algorithm Based on QoS and QoE Information in LTE Systems
指導教授: 黎碧煌
Bih-hwang Lee
口試委員: 余聲旺
Sheng-wang Yu
吳傳嘉
Chwan-chia Wu
鍾添曜
Tein-yaw Chung
陳俊良
Jiann-liang Chen
學位類別: 碩士
Master
系所名稱: 電資學院 - 電機工程系
Department of Electrical Engineering
論文出版年: 2014
畢業學年度: 102
語文別: 中文
論文頁數: 63
中文關鍵詞: 長期演進技術經驗品質排程演算法
外文關鍵詞: LTE, QoE, Scheduling algorithm
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  • 在無線網路環境中,無線資源的分配是一項重要課題,「無線即有限」這句話充分地說明了無線網路的珍貴特性。為了讓無線資源能夠更有效的分配,許多改良排程演算法不斷地被提出,但大部分的演算法專注於符合服務品質(Quality of service; QoS)的最低要求,例如封包延遲時間或遺棄率的限制,而忽略了使用者的感受,即為用戶端的經驗品質(Quality of experience; QoE)。
    用戶經驗品質代表著該用戶接受到服務後最直接的觀感。目前已有許多研究將用戶經驗品質概念作為其演算法效能評估的標準,但是大多侷限於網路協定中網路層以上的探討。因此本研究將提出一個以平均意見指標為基礎(Mean opinion score based; MB),結合服務品質與經驗品質的資源分配演算法,希望能夠利用服務品質的效能評估項目,例如封包延遲時間與遺棄率,來快速地計算出用戶經驗品質的平均意見指標,並以此做為排程演算法的排程參考依據,以達到在指定經驗品質下的用戶數量最大。
    模擬結果顯示出利用本論文所提出的基於平均意見指標之排程演算法除了能符合LTE(Long term evolution)中對於服務品質的要求還能進一步提升每位使用者的經驗品質,此演算法能有效的讓大部分的使用者皆擁有良好的經驗品質。


    In the wireless network environment, the radio resource allocation is an important issue. To make radio resource allocate more efficiently, many improved algorithms have been proposed constantly. However, most of algorithms focus on meeting the minimum demand of the quality of service (QoS) such as the packet delay or the limits of packet loss rate. Besides, the user’s feelings, namely, the quality of experience (QoE) are ignored.
    QoE represents the users’ most direct perception after they receive the service. Nowadays, there are many researchers treating the concept of QoE as the standard of efficacy evaluation for algorithms. However, most of them are confined to the investigation of the network layer above in the network protocol. Thus, this study will propose the mean opinion score based algorithm (MB) and combine the resource allocation algorithms of QoS and QoE to adopt the items of efficacy evaluation of QoS such as the packet delay and the limits of packet loss rate to fast calculate the MB of QoE. In addition, the MB of QoE will serve as the basis of the scheduling algorithm to attain the maximum numbers of users.
    The simulation results show that the scheduling algorithm based on MB proposed from this study, not only meet the demand of QoS for long term evolution (LTE), but also further enhance every user’s QoE. In short, this algorithm can effectively make most of users possess excellent QoE.

    摘要 i Abstract ii 誌謝 iii 圖目次 vi 表目次 ix 第一章 緒論 1 1.1、 簡介 1 1.2、 研究動機與目的 1 1.3、 章節概要 2 第二章 LTE、經驗品質及排程演算法介紹與相關研究 3 2.1、 LTE與LTE-Advanced之演進 3 2.1.1 LTE規格簡介 3 2.1.2 LTE訊框架構 7 2.1.3 排程演算法介紹 10 2.2、 經驗品質(QoE)介紹 14 2.2.1 量化經驗品質 15 2.2.2 客觀經驗品質之評估方式 16 2.2.3 量化方法之選用原則及相關研究 17 2.3、 經驗品質與排程演算法的結合 23 第三章 排程法調整機制介紹 25 3.1、 研究方法 25 第四章 模擬環境設定與結果 31 4.1.、 模擬環境及模擬參數 31 4.2.、 效能評估項目與模擬結果分析 34 4.2.1 各區間平均意見指標之人數比例 35 4.2.2 各使用者平均意見指標之累積分布函數 38 第五章 結論以及未來研究 59 參考文獻 61

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