(3.234.221.162) 您好!臺灣時間:2021/04/14 02:55
字體大小: 字級放大   字級縮小   預設字形  
回查詢結果

詳目顯示:::

我願授權國圖
: 
twitterline
研究生:雷淵濬
研究生(外文):Yuan-chun Lei
論文名稱:LTE階層系統軟性頻率使用及微細胞選擇延伸調整之研究
論文名稱(外文):Study of parameter adjustment for soft frequency reuse and cell range expansion in LTE heterogeneous systems
指導教授:陳永芳陳永芳引用關係
指導教授(外文):Yung-fang Chen
學位類別:碩士
校院名稱:國立中央大學
系所名稱:通訊工程學系在職專班
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:2013
畢業學年度:101
語文別:中文
論文頁數:62
中文關鍵詞:長期演進技術階層系統軟性頻率使用細胞選擇延伸參數調整
外文關鍵詞:LTE:Long Term Evolutionheterogeneous systemSFR:soft frequency reuseCRE:cell range expansionparameter adjustment
相關次數:
  • 被引用被引用:0
  • 點閱點閱:191
  • 評分評分:系統版面圖檔系統版面圖檔系統版面圖檔系統版面圖檔系統版面圖檔
  • 下載下載:14
  • 收藏至我的研究室書目清單書目收藏:0
通常客訴主要發生在細胞邊緣客戶,以2G/3G而言,現場人員常使用改善方式之一,就是調整涵蓋區相關功率,相對LTE內類似的技術,就是CRE(cell range expansion)及SFR(soft frequency reuse)。本文對pico cell SFR的可用性深入研究,同時對SFR及CRE這兩項技術進行整合性的探討,分析其對下鏈路影響、限制、相互關係及都會區與郊區間差異,最後歸類一個簡單調整方法及建議值,供現場人員改善細胞邊緣使用者傳輸率之參考。
經由我們分析及模擬結果,SFR及CRE調整值都不宜太高。而SFR雖可改善細胞邊緣使用者傳輸率,但與平均傳輸率通常是trade-off;可是在郊區pico cell 通道品質較好的地方,pico cell SFR適當的調整值,對pico cell 5%使用者傳輸率可改善18%、平均傳輸率可改善2%,整個系統5%使用者傳輸率及平均傳輸率可提昇將近2%。另對pico cell CRE造成使用者服務中斷問題,搭配pico cell SFR使用,約有1 ~4%改善效果。至於我們歸納的簡單調整方式,經模擬顯示具可用性。
Customer complaints usually come from cell edge users. For 2G/3G complaints, one of the most commonly used improvement methods by on-site personnel is to adjust the correlation power of the covered area. This is relatively similar to the technologies within LTE, which are CRE (cell range expansion) and SFR (soft frequency reuse). This thesis is an in-depth study of the usability of pico cell SFR and also performs an integrated study of both the SFR and CRE technologies, analyzing their influences, restrictions, and interrelations for the down links and differences between urban areas and rural areas. And finally, conclude a simple adjustment method and recommended value for on-site personnel to use as a reference to improve the throughput of cell edge users.
Our analysis and simulation results indicated that the adjusted value of both SFR and CRE should not be too large. Also, although SFR is able to improve the throughput of cell edge users, it’s usually a trade-off with the average throughput. However, at rural areas where there are better pico cell channel qualities, a suitable adjusted value of pico cell SFR was able to improve the throughput for 5% of pico cell users by 18% and improve the average throughput by 2%. The throughput of 5% of the users and the average throughput in the overall system were able to be increased by almost 2%. In addition, for pico cell CRE problems that caused the user to get blocked or dropped, when used with pico cell SFR, there was an approximately 1~4% improvement. As for the simple adjustment method that we concluded, simulation results showed that it was usable.
論文摘要 i
Abstract ii
目 錄 v
圖 目 錄 viii
表 目 錄 xi
第一章 緒 論 1
1-1 研究背景 1
1-2 研究動機 1
1-3 章節概要 2
第二章 LTE 系統及技術簡介 4
2-1 下鏈路無線傳輸技術 4
2-2 LTE下鏈路資源區塊架構 5
2-3 細胞階層式架構 9
2-4訊號量測方式 9
2-4-1 RSRP 9
2-4-2 RSRQ 10
2-4-3 CQI 10
2-5細胞選擇 11
2-5-1 細胞選擇方式 11
2-5-2 CRE 11
2-6頻率重用方式 12
2-7資源分配方式 13
第三章 基地台環境及性能探討 16
3-1 基地台涵蓋對細胞選擇及SINR影響 16
3-2 pico cell CRE對UE 影響 18
3-2-1 pico cell CRE對pico cell UE SINR影響 18
3-2-2 pico cell CRE 對細胞選擇及SINR影響 18
3-3 細胞選擇方式的差異 20
3-4 CQI回報與資源分配關係 21
3-5 細胞選擇對資源分配的影響 21
第四章 SFR與CRE調整方式及模擬方法說明 22
4-1 SFR與CRE調整方式建議 22
4-1-1 macro cell與pico cell SFR頻率重用設定方式 22
4-1-2 調整方式 24
4-1-3 建立調整指標 24
4-1-4 pico cell CRE與pico cell SFR搭配使用 25
4-2 基地台模擬架構 25
4-2-1 基地台參數設定 25
4-2-2 基地台及用戶佈放架構 27
4-2-3 SFR RSRP計算及對細胞選擇影響 27
4-2-4 SFR CQI與SINR轉換及對CEU選擇影響 28
4-3 基因演算法 32
4-3-1 基因演算法簡介 32
4-3-2 基因演算法參數設定 33
4-3-3 基因演算法程式架構 34
第五章 模擬結果與分析 35
5-1基地台環境差異分析 36
5-2 macro cell SFR性能分析 38
5-3 pico cell CRE性能分析 43
5-4 pico cell SFR性能分析 46
5-4-1 pico cell SFR基本性能分析 46
5-4-2 pico cell good UE統計及應用 50
5-4-3 pico cell SFR對CRE bad UE的效益 51
5-5 優化調整參考值 53
5-6 簡化調整方法可行性 54
第六章 結論與未來研究 60
參考文獻 61
[1]3GPP TR 25.814, "Physical layer aspects for evolved Universal Terrestrial Radio Access (UTRA)”, V7.1.0, pp.20, pp.120-122, September 2006.
[2]3GPP TS 36.300, "Overall description”, V8.5.0, pp.19, May 2008.
[3]Erik Dahlman , Stefan Parkvall, and Johan Skold," LTE/LTE-Advanced for mobile broadband ", Academic Pr, April 2011.
[4]3GPP TS 36.211, “Physical channels and modulation”, V8.3.0, pp. 75, May 2008.
[5]3GPP TS 36.104, “Base station (BS) radio transmission and reception”, V8.2.0, pp. 11, May 2008.
[6]3GPP TS 36.214, “Physical layer – measurements”, V8.3.0, pp. 7, May 2008.
[7]3GPP TS 36.213, “Physical layer procedures”, V8.3.0, pp. 12, pp. 24-34, May 2008.
[8]Jaturong Sangiamwong, Yuya Saito, Nobuhiko Miki, Tetsushi Abe, Satoshi Nagata, and Yukihiko Okumura, “Investigation on cell selection methods associated with Inter-cell interference coordination in heterogeneous networks for LTE-Advanced downlink” , Wireless Conference 2011 - Sustainable Wireless Technologies (European Wireless), pp. 1-6, Vienna, Austria, April 2011.
[9]David Lopez-Perez, Ismail Guvenc, Guillaume de la Roche, Marios Kountouris, Supelec Tony Q. S. Quek, and Jie Zhang , “Enhanced intercell interference coordiantion challenges in heterogenous networks”, IEEE wireless communications, Vol 18, pp. 22-30, June 2011.
[10]胡智明,“正交分頻多工接取系統之細胞間干擾降低研究”,國立中央大學,碩士論文,July 2010.
[11]Krishna Balachandran, Joseph H. Kang, Kemal Karakayali, and Kiran Rege, “Cell selection with downlink resource partitioning in heterogeneous networks”, 2011 IEEE International conference on communications workshops(ICC), pp. 1-6, Kyoto, June 2011.
[12]3GPP TR 36.814, “Further advancements for E-UTRA physical layer aspects”, V9.0.0, pp. 65, March 2010.
[13]3GPP TR 36.942, “Radio frequency (RF) system scenarios”, V10.2.0, December 2010.
[14]Hiroshi Harada and Ramjee Prasad, "Simulation and software radio for mobile communications", Artech House, 2002.
[15]網路資料 on line resources:Yuanye Wang, “OFDM-Based wireless broadband system simulator ”, V1.1, 2011年,取自http://www.mathworks.com/。
[16]王文俊教授,"認識Fuzzy",三版,全華圖書,民國九十四年。
[17]張智星、孫春在和水谷英二,Neuro-Fuzzy and Soft Computing, Prentice Hall, September 1996.
[18]Rajendra K. Jain, Dah-Ming W. Chiu, and William R. Hawe, “A quantitative measure of fairness and discrimination for resource allocation in shared computer system”, Digital Equipment Corporation research report TR-301, September 1984.
[19]Stefania Sesia, Issam Toufik, and Matthew BakerL,"LTE - The UMTS long term evolution: from theory to practice", second edition, WILEY, September 2011.
[20]網路資料 on line resources:3GPP, http://www.3gpp.org/
連結至畢業學校之論文網頁點我開啟連結
註: 此連結為研究生畢業學校所提供,不一定有電子全文可供下載,若連結有誤,請點選上方之〝勘誤回報〞功能,我們會盡快修正,謝謝!
QRCODE
 
 
 
 
 
                                                                                                                                                                                                                                                                                                                                                                                                               
第一頁 上一頁 下一頁 最後一頁 top
系統版面圖檔 系統版面圖檔