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研究生:王柏瑋
研究生(外文):WANG,BO-WEI
論文名稱:以分散式功率控制降低LTE/LTE-A 微型基地台網路之同層下行鏈路干擾
論文名稱(外文):Distributed Power Control for the Mitigation of Co-Tier Downlink Interference in LTE/LTE-A Femtocell Networks
指導教授:王煌城
指導教授(外文):WANG,HWANG-CHENG
口試委員:郭芳璋曾志成丁國章李宗演
口試委員(外文):KUO,FANG-CHANGTSENG,CHIH-CHENGTING,KUO-CHANGLEE,TRONG-YEN
口試日期:2016-06-30
學位類別:碩士
校院名稱:國立宜蘭大學
系所名稱:電子工程學系碩士班
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:2016
畢業學年度:104
語文別:中文
論文頁數:36
中文關鍵詞:Femtocell警告訊號功率控制同層下行干擾FBS-Excessive Interference source
外文關鍵詞:femtocellco-tier downlink interferencealarm signalFBS-excessive interference sourcepower control
相關次數:
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LTE (Long Term Evolution)已成為4G 行動通訊標準,各電信商皆以推廣LTE 為主。
而家用基地台(Femtocell Base Station,FBS)相關技術的發展讓無線通訊增加了機動性與
協調性,不但提升室內行動裝置的訊號品質,更讓大型基地台有更多的頻段服務室外的
用戶。然而,隨著FBS 日漸普及,且其安裝具簡易與隨機性,所以FBS 與FBS 之間的
干擾(又稱同層干擾)會是嚴重的問題之一。因此,如何減少FBS 之間的同層下行干擾是
本論文主要探討的方向。
本論文假設所有的FBS 是在共享式頻譜的且以開放式用戶群(Open Subscriber
Group, OSG)的模式下提供用戶存取FBS 的資源。由於FBS 由用戶隨機佈建,且FBS
的開啟與關閉也由用戶決定,所以FBS 的隨機性非常高。本論文假設FBS 是在社區等
有規劃過的環境,且不透過Femtocell Management System (FMS)的系統管理者收集與交
換訊息,而透過用戶端設備(FUE)發出警告訊號,藉由干擾源收到警告數量的概念主導
整體論文方向,以此來省略過多繁雜的資料交換手續;FBS 收到警告訊息後,以收到的
警告數量決定必須縮減功率的FBS 有哪些,這些干擾過多用戶的FBS 定義為
FBS-Excessive Interference(FBS-EI) Source。
利用 FUE 警告干擾源訊號量的多寡控制FBS 的功率大小,同樣能達到降低干擾的
效果。最後,經由Matlab 模擬,結果顯示本論文提出的方法確實能在共享式頻譜的
Femtocell 網路中有效降低同層下行干擾。
LTE femtocell base stations (FBSs) have expanded the coverage of wireless communication
systems. The growing use of FBSs has brought a serious issue of inter-FBS interference (also
referred to as co-tier interference) due to their easy and convenient installation. This study
proposes a systematic approach to reduce FBS co-tier downlink interference. In this study,
FBSs are densely deployed in an environment and femtocell user equipments (FUEs) detect
interference from FBSs and send an alarm signal to each FBS which interferes with it. To
minimize the negative effects of interference, power levels are reduced for FBSs identified as
excessive interference sources, which are defined as FBSs that have received a number of
alarm signals over a given threshold. The method proposed in this study has been validated
through simulation and is found to effectively reduce co-tier downlink interference in
shared-spectrum femtocell environments, thereby improving system performance.
目錄
中文摘要.........................................................................I
Abstract................................................................. II
致謝 ........................................................................ III
目錄 ..........................................................................IV
圖目錄.........................................................................VI
表目錄 .........................................................................VIII
第一章導論 ...........................................................................1
1.1 前言 ...........................................................................1
1.2 研究動機.........................................................................1
1.3 研究目的.........................................................................2
1.4 論文組織.........................................................................3
第二章 Femtocell 背景與相關技術應用.........................................................................4
2.1 Femtocell 研究背景介紹.........................................................................4
2.1.1 Femtocell 研究背景介紹.........................................................................4
2.1.2 FBS 的六大優勢.........................................................................5
2.1.3 Shannon 通道容量公式.........................................................................5
2.2 Femtocell 的存取控制機制.........................................................................7
2.3 自組織網路.........................................................................7
2.4 頻譜分配方法.........................................................................8
2.4.1 分割式頻譜共用(Split Spectrum Reuse)..................................8
2.4.2 共享式頻譜再用(Shared Spectrum Reuse) ................................9
2.5 各種干擾環境........................................................................11
2.5.1 跨層干擾........................................................................12
2.5.2 同層干擾........................................................................12
V
2.6 干擾管控........................................................................13
2.6.1 功率控制(Power Control)..................................................................13
2.6.2 部分頻率重複使用(Fractional Frequency Reuse) .........................14
2.6.3 靜音(Muting) ..........................................................................15
第三章 Femtocell 同層下行干擾........................................................................18
3.1 問題探討 ..........................................................................18
3.2 系統模型 ..........................................................................19
3.3 干擾源感知功率控制機制(Interference Aware Power Control)................21
3.4 功率控制機制 ..........................................................................22
第四章 模擬結果 ..........................................................................25
4.1 模擬參數表 ..........................................................................25
4.2 環境佈點圖........................................................................25
4.3 T 值的影響........................................................................27
4.4 IAPC 環境影響的分析........................................................................28
第五章 結論與未來展望 ..........................................................................34
5.1 總結........................................................................34
5.2 未來展望........................................................................34
參考文獻 ..........................................................................35
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