博碩士論文 etd-0604115-002549 詳細資訊


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姓名 張剛瑋(Kang-wei Chang) 電子郵件信箱 E-mail 資料不公開
畢業系所 電機工程學系研究所(Electrical Engineering)
畢業學位 碩士(Master) 畢業時期 103學年第2學期
論文名稱(中) 在LTE-A網路上藉由ARQ Status Reports來動態分配RB
論文名稱(英) Dynamic RB Allocations Using ARQ Status Reports in LTE-A Networks
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  • etd-0604115-002549.pdf
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    紙本論文:2 年後公開 (2017-07-04 公開)

    電子論文:使用者自訂權限:校內 2 年後、校外 4 年後公開

    論文語文/頁數 中文/81
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    摘要(中) 在LTE-A網路中傳統的AMC機制在配置RB時,eNodeB會根據UE所回報的SNR/CQI的對應表與UE要求的Data Rate來計算RB的大小,此配置方式會造成eNodeB分配過大的RB給UE。為了解決此問題,本論文提出了一個動態的RB配置機制,UE使用ARQ Status Report來通知eNodeB重傳錯誤的封包,eNodeB會根據Status Report內的序列號碼計算出各個UEs在單位時間內的資料處理量,藉此重新調整各UEs所需要的實際RB大小以節省下不必要的頻寬浪費,另外在處理資料排程時,我們考慮三種型態的資料流(Audio、Video、Data)分別具有不同優先權的特性,我們的機制會更改AMC機制所選定的調變技術,其目的是讓一個OFDMA Frame的使用率大幅上升,為了避免最低優先權的Data Traffic發生Starvation,我們設定Audio與Video Traffic的Bit Rate有一個使用上限,最後我們使用NS-3模擬器模擬我們所提出的動態RB配置機制,從模擬結果可以證實使用我們的機制比使用AMC機制可以更有效提升系統的Utilization、降低UE的Blocking Rate與增加UE成功連線的數目,並保障在Noise越高且欲連線的Video Traffic數目越多時其Blocking Rate的改善幅度越大。
    摘要(英) In an LTE-A network, the traditional AMC scheme allocates RB based on SNR/CQI table reported from UE and the data rate requirement of UE. However, this scheme will lead to allocating RB which is beyond the requirement of UE. To solve the problem, this thesis proposes a dynamic RB allocation scheme by utilizing ARQ status report in which UE reports erroneous packet with sequence number to eNodeB. From the status report, eNodeB will compute the amount of successfully received data per unit time of each UE. Therefore, eNodeB can properly allocate RB which is exactly the requirment of each UE. Moreover, in this thesis, we consider three traffic types (audio, video, and data) with different priorities. Our proposed scheme can alter the modulation determined by AMC such that the utilization of an OFDMA frame can be tremendously increased. To prevent the starvation of data traffic which has the lowest priority, we set an upper bound of occupied RB for audio and video traffic in an OFDMA frame. At last, we perform NS-3 simulation to demonstrate the superiority of the proposed scheme. The simulation results show that our proposed scheme can perform much better than the traditional AMC scheme in terms of system utilization, blocking rate of UEs, and the number of successfully connected UEs. Particularly, when in a high noise environment and a large number of UE, the proposed scheme can guarantee a smaller blocking rate for video traffic.
    關鍵字(中)
  • 資料型態
  • NS-3
  • LTE-A
  • 動態RB配置
  • ARQ重傳機制
  • AMC
  • 關鍵字(英)
  • Traffic Types
  • NS-3
  • LTE-A
  • RB allocations
  • AMC
  • ARQ
  • 論文目次 致謝 i
    摘要 ii
    Abstract iii
    目錄 iv
    圖表目錄 vii
    第一章 導論 9
    1.1 研究動機 9
    1.2 研究方法 10
    1.3 章節介紹 12
    第二章  LTE-A與RBs的配置 13
    2.1 LTE-A的資料傳輸 13
    2.1.1 OFDMA 13
    2.1.2 AMC 15
    2.1.3 ARQ 16
    2.2 相關研究 17
    2.2.1 根據UE要求的Data Rate配置RB 17
    2.2.2 根據Traffic Type配置RB 18
    2.2.3 使用AMC與CQI配置RB 19
    2.2.4 其它配置RB的相關研究 20
    2.3 本論文的RB配置機制 20
    第三章 跨層級的動態RB配置機制 22
    3.1 通道品質與RB配置 22
    3.2 動態的RB分配 24
    3.2.1 實際Data Rate的計算 24
    3.2.2 Total Data Rate與RB 大小 26
    3.2.3 三種不同型態的資料封包的RB配置 30
    第四章 模擬與結果討論 34
    4.1 模擬環境 34
    4.2 模擬程式架構 35
    4.3 模擬參數的設定與結果 47
    4.3.1 模擬參數的設定 47
    4.3.2 模擬結果 48
    第五章 結論與未來工作 64
    5.1 結論 64
    5.2 模擬所遭遇的困難 66
    5.3 未來工作 66
    Reference 68
    Acronyms 74
    Index 75
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    口試委員
  • 李宗南 - 召集委員
  • 周孜燦 - 委員
  • 黃宗傳 - 委員
  • 許蒼嶺 - 指導教授
  • 口試日期 2015-06-17 繳交日期 2015-07-04

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