下一代行動網路之非統一ABS 配置方法｜國立中央大學博碩士論文系統

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研究生：	詹淳愉 Chun-Yu Chan
論文名稱：	下一代行動網路之非統一ABS 配置方法 A Non-uniform ABS allocation for next generation networks
指導教授：	張貴雲 Guey-Yun Chang
口試委員:
學位類別：	碩士 Master
系所名稱：	資訊電機學院 - 資訊工程學系 Department of Computer Science & Information Engineering
論文出版年：	2019
畢業學年度：	107
語文別：	英文
論文頁數：	47
中文關鍵詞：	幾乎空白子訊框、基地台範圍擴展、雙連線
外文關鍵詞：	ABS, CRE, Dual Connectivity
相關次數：	點閱：15 下載：0
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為了滿足現今的網路需求的快速成長以及資料傳輸嚴格的時間延遲要求。這篇論文的目標希望降低大小基地台間的干擾並藉由波束賦形來提升波束的利用率來有效的提升系統效能以及降低最佳化的計算時間。在LTE中，增強型蜂巢式區域間干擾消除技術利用統一的ABS配置也就是所有大小基地台都使用相同的ABS配置來降低基地台間的干擾，並利用基地台範圍擴展技術來達到負載平衡。然而採用統一的ABS配置會因為無法有效的利用每個基地台的波束而造成系統資源的浪費。為了解決這個資源浪費的問題，我們提出一個在雙連線環境下使用非統一的ABS配置結合基地台範圍擴展技術可以使得每個基地台的波束都有自己最佳的ABS比例來提升波束的利用率。在這篇論文中，當小基地的波束上具有小基地台邊緣使用者時，讓小基地台邊緣使用者在ABS訊框接收下行資料且讓小基地台中心使用者在非ABS訊框接收下行資料。當小基地台的波束上不存在小基地台邊緣使用者時，讓小基地台的中心使用者可以在ABS以及非ABS訊框接收資料。最後我們使用Gurobi這個最佳化計算工具來評估演算法的效能及執行時間。

In order to satisfy increasing traffic demands, 5G network supported beamforming to improve the system throughput. This paper aims to reduce the interference between macro cell and small cell and increase the system beam utilization by beamforming to efficiently improve the system throughput and decrease the execution time of optimal ABS allocation computation. In LTE, traditional enhanced Inter-Cell Interference Coordination reduces the interference between cells by Uniform ABS allocation and achieves load balancing by Cell Range Expansion. However, adopting Uniform ABS allocation will waste the system resources because it can't fully utilize the beam of each cell. In order to address the waste of resources problem, we proposed a beam-based Non-uniform ABS allocation with CRE in Dual Connectivity algorithm that made each beam of cells use its own optimal ABS ratio to increase the beam utilization and each small cell have its own optimal CRE bias. Other than this, in this paper, if there are small cell edge users located at the beam of small cell, we will allocate the ABS subframes for small cell edge users and Non-ABS subframes for small cell center users. If there are no small cell edge users located at the beam of small cell, we will allocate the ABS subframes and Non-ABS subframes for small cell center users to receive downlink data. Final, we used Gurobi which is a commercial optimization solver to evaluate our performance and execution time.

中文摘要                                                           i
Abstract                                                          ii
Contents                                                          iii
List of Figures                                                   v
List of Tables                                                    vii
INTRODUCTION                                                    1
RELATED WORK AND PRELIMINARY                                    4
1 enhanced Inter-Cell Interference Coordination (eICIC)         4
1.1 Cell Range Expansion (CRE)                                  4
1.2 Almost Blank Subframes (ABS)                                5
2 Dual Connectivity                                             8
SYSTEM MODEL                                                    10
1 Phy Data Rate                                                 10
2 ABS Transmission Information                                  11
THE PROPOSED ALGORITHM MODEL                                    14
1 Non-Uniform ABS under Beamforming Environments                15
2 Non-uniform CRE under Beamforming Environments                17
3 Starvation of Small Cell Edge Users                           18
4 Small Cell Between Two Macro Cell Beam                        18
5 Mathematical Model                                            19
6 Computation Cost                                              22
7 Detail of the Proposed Algorithm Model                        23
EVALUATION                                                      25
1 Scenario                                                      25
2 Comparative eICIC Schemes                                     26
3 Execution time Estimation                                     27
4 Throughput Estimation                                         27
4.1 Fixed ABS Ratio vs. Dynamic ABS Ratio                       28
4.2 Uniform ABS Allocation vs. Non-uniform ABS Allocation       28
4.3 Static CRE vs. Dynamic CRE                                  29
4.4 Traditional UE Allocation vs. Dynamic UE Allocation         29
CONCLUSION                                                      31
Bibliography                                                      32
                                

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