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研究生:楊博淵
研究生(外文):Bo-Yuan Yang
論文名稱:以協調式多點傳輸機制改善LTE-A異質網路間下行傳輸干擾
論文名稱(外文):Combined DPS and JT CoMP Tehcniques to Reduce Interference for Downlink in LTE-A Heterogeneous Networks
指導教授:黎碧煌
指導教授(外文):Bih-Hwang Lee
口試委員:鍾添曜鄭瑞光吳傳嘉陳俊良黎碧煌
口試委員(外文):Tein-Yaw ChungRay-Guang chengChwan-Chia WuJiann-Liang ChenBih-Hwang Lee
口試日期:2017-07-19
學位類別:碩士
校院名稱:國立臺灣科技大學
系所名稱:電機工程系
學門:工程學門
學類:電資工程學類
論文種類:學術論文
論文出版年:2017
畢業學年度:105
語文別:中文
論文頁數:69
中文關鍵詞:長期演進技術升級版異質網路協調式多點微微型基地台
外文關鍵詞:LTE-AHeterogeneous networksCoordinated multipointpico cell
相關次數:
  • 被引用被引用:0
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  • 下載下載:17
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在長程演進技術升級版(Long Term Evolution Advanced; LTE-A)中,異質網路(Heterogeneous networks)用於解決位在訊號品質不佳之建築物內或細胞邊緣的用戶、人口過於密集導致頻寬資源不足的問題,透過布建不同發射功率的小型基地台,以提高建物內訊號強度及頻寬重複使用效率。由於基地台間使用相同頻寬即會互相干擾,因此為避免或減輕干擾情況,基地台會互相協調,此一協調機制又稱協調式多點(Coordinated Multipoint, CoMP)。
本論文目的是在異質網路中利用CoMP機制改善各基地台邊緣用戶的服務品質並提升系統傳輸量,邊緣用戶由於基地台的訊號強度不足以及其他基地台的干擾訊號,使得傳輸效率降低,導致用戶無法達到所需的服務品質,因此分別使用CoMP的動態選擇傳輸點(Dynamic point selection; DPS)降低邊緣用戶接收的干擾,以及聯合傳輸(Joint transmission; JT)提升邊緣用戶接收的訊號強度。
模擬結果顯示,本論文提出的方法與無干擾管理的異質網路比較,能有效提升細胞邊緣用戶接收量93%以及增加整體系統傳輸量59%。當再增加Pico eNB覆蓋範圍,使各個基地台服務用戶數達到一定平衡時,可再進一步增加系統的傳輸量。
In Long Term Evolution Advanced, Heterogeneous networks where low power nodes are overlaid within eNB are used to increase the quality of signal of user equipment which is in the poor signal area and system capacity. By deploying low power nodes in the buildings or hot spots increases the signal strength and frequency reuse. If nodes use same frequency band, Co-channel interference problem will happen. In order to mitigate the Co-channel interference, nodes can coordinate with each other which is called Coordinated Multipoint (CoMP).
In this paper, in order to improve the quality of service of edge users and enhance system throughput in the heterogeneous network, will use the CoMP technology. The transmission efficiency of edge users will be decreased due to the lack of signal strength and the interference from other base stations. Therefore, the DPS of CoMP is used to reduce the interference of edge users and the JT of CoMP is used to enhance the signal strength of edge users.
The simulation results show that the proposed scheme can improve the throughput of edge users 93% and increase the system throughput 59% compared with non-interference management heterogeneous network. When increasing the small eNB coverage, so that the number of base station service users achieve a certain balance, can further increase system throughput.
摘要 iv
Abstract v
誌謝 vi
目次 vii
圖目次 x
表目次 xiii
第 一 章 緒論 1
1.1 簡介 1
1.2 研究動機與目的 2
1.3 章節概要 2
第 二 章 LTE-A 概述 3
2.1 LTE-A 簡介 3
2.1.1 系統架構 3
2.1.2 實體傳輸層 (Physical Layer for E-UTRA) 5
2.1.3 LTE排程方式 12
2.2 LTE-A 相關技術 13
2.2.1 強化多重輸入輸出(Enhanced multiple-input multiple-output) 13
2.2.2 載波聚合 (Carrier Aggregation; CA) 13
2.2.3 異質網路 (Heterogeneous Networks; HetNet) 14
2.2.4 協調式多點 (Coordinated multi-point; CoMP) 18
2.2.5 裝置間通訊 (Device to Device communication; D2D) 20
2.3 相關研究 21
第 三 章 協調式多點傳輸策略 23
3.1 研究方法 23
3.2 初始情境設置 25
3.3 用戶根據RSRP選擇服務基地台並回傳CQI 26
3.3.1 用戶選擇服務基地台 27
3.3.2 計算各模式SINR 28
3.3.3 回傳各模式CQI及基地台對照表給基地台 31
3.4 基地台根據回傳資訊以EDF/MT分配資源區塊 33
3.4.1 排程重疊頻段 34
3.4.2 排程不重疊頻段 37
第 四 章 系統模擬與結果 46
4.1 模擬環境與參數 46
4.2 效能評估項目 49
4.3 模擬結果分析與比較 53
4.3.1 CRE Bias = 6 dB 53
4.3.2 增加CRE對系統的影響 59
第 五 章 結論與未來研究 64
參考文獻 65
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