LTE下行系統之分散式基地台干擾協調方法研究

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姓名

羅康豪(Kang-Hao Lo) 查詢紙本館藏

畢業系所

通訊工程學系

論文名稱

LTE下行系統之分散式基地台干擾協調方法研究
(Study of De-centralized Inter-Cell Interference Coordination Method in LTE Downlink System)

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摘要(中)

隨著科技的進步與第三代合作夥伴計劃所規範的LTE/LTE-A的普及，基地台間干擾的協調越顯重要。因為在LTE-A的標準當中已經將昂貴頻譜之頻譜使用率(FRF)提升為1，這也代表著營運商不再使用切割頻譜的方式來避開基地台間干擾了，進而提升整體的頻譜使用率。同時，在LTE/LTE-A的無線接取網路技術廣受青睞，分散式的基地台間干擾的協調方法將比集中式的方法來的更為合適。由於有著LI (Load Information) 及其傳送通道X2介面的出現，LTE/LTE-A中更能有效地執行基地台間干擾的協調方法進而改善因為處於基地台覆蓋邊緣的UE (User Equipment) 受到相鄰基地台的干擾。在蜂巢式基地台網路的架構下因為基地台覆蓋邊緣的數量及面積增加，基地台間干擾的協調就更顯不可或缺了。在此論文中，我們將提出名為RTRBC (Relative Throughput based RB Coordination Scheme)的分散式基地台間干擾協調方法用以解決基地台間的干擾協調議題。藉由比較得失的啟發方式，所提出的架構將在基地台間協商使用的無線資源而達到更高的系統吞吐量。而實驗的結果能展現所提出的方法之效率值。

摘要(英)

Inter-cell Interference coordination (ICIC) has been more and more important in the 3rd Generation Partnership Project’s (3GPP’s) Long Term Evolution –Advanced (LTE-A) standardization since the Frequency Reuse Factor (FRF) has already been 1 which means we utilized whole frequency without partition into several segmentations. Meanwhile, with radio access networks in LTE/LTE-A are flatter, decentralized ICIC algorithm has become more suitable than the centralized algorithm. Because of the import of the Load Information (LI) through X2 interface, ICIC could be effectively used to reduce the interference of edge users in LTE/LTE-A system. In the multi-cell radio resource management of LTE/LTE-A system, ICIC plays a significant role in enhancing cell edge spectrum efficiency. In this thesis, we propose a decentralized ICIC method, named relative throughput based resource block coordination (RTRBC), to coordinate the interference between eNBs. By comparing the relative gain and loss in heuristic manner, the proposed scheme negotiates the RB usage between adjacent eNBs to achieve higher throughput. The simulation results also demonstrate the effectiveness of the proposed scheme.

關鍵字(中)

★ LTE下行鏈路
★ 基地台間干擾之協調方法

關鍵字(英)

★ LTE downlink
★ ICIC
★ Inter Cell Interference Coordination

論文目次

中文摘要 I
ABSTRACT II
誌謝 III
OUTLINE IV
FIGURES VI
TABLES VII
CHAPTER 1 INTRODUCTION 1
 1.1 BACKGROUND 1
 1.2 MOTIVATIONS 1
 1.3 CHAPTER OUTLINE 2
CHAPTER 2 RESEARCH BACKGROUND 4
 2.1 LTE SYSTEM ARCHITECTURE 4
 2.2 FRAME STRUCTURE 6
 2.3 CHANNEL BANDWIDTH AND MODULATION SCHEMES 8
 2.4 CHANNEL QUALITY INDICATOR 9
 2.5 FREQUENCY REUSE OVERVIEW 10
2.5.1 Hard Frequency Reuse 10
2.5.2 Fractional Frequency Reuse 11
 2.6 RELATED WORKS 12
 2.7 PROBLEM ANALYSIS 14
CHAPTER 3 RELATIVE THROUGHPUT BASED RB COORDINATION SCHEME 18
 3.1 SYSTEM ARCHITECTURE 18
 3.2 RTRBC WEIGHTING FUNCTIONS DESIGN 21
3.2.1 RTRBC Scheme 22
3.2.2 RTRBC-r Scheme 24
 3.3 DE-CENTRALIZED VIRTUAL COMPETITION 25
CHAPTER 4 PERFORMANCE SIMULATIONS 27
 4.1 SIMULATION MODEL 27
 4.2 SIMULATION CYCLE AND ASSUMPTIONS 28
 4.3 SIMULATION RESULTS 29
4.3.1 Uniform Saturation Ratio Model 30
4.3.2 Hotspot Model 33
4.3.3 Two-Cell Model 35
4.3.4 Star Model 38
CHAPTER 5 CONCLUSIONS 41
REFERENCES 42

參考文獻

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指導教授

陳彥文(Yen-Wen Chen)

審核日期

2015-7-7

推文