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| 研究生： |
王鐘毅 Wang, Chung Yi |
|---|---|
| 論文名稱： |
優化LTE-A中繼網路中使用頻率重用的資源分配 Optimal Resource Allocation for Frequency Reuse in LTE-A Relay Networks |
| 指導教授： |
張宏慶
Jang, Hung Chin |
| 學位類別： |
碩士
Master |
| 系所名稱： |
理學院 - 資訊科學系 |
| 論文出版年： | 2013 |
| 畢業學年度： | 101 |
| 語文別： | 中文 |
| 論文頁數： | 76 |
| 中文關鍵詞： | 中繼站 、頻率重用 、長程演進 、動態資源分配 、干擾協調 |
| 外文關鍵詞： | relay network, frequency reuse, LTE-A, dynamic resource allocation, inter cell interference coordination |
| 相關次數： | 點閱：134 下載：3 |
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LTE-A系統考慮了中繼站(Relay Station，RS)的配置，當RS的引入在改變網路架構的同時，也使得系統的無線電資源需要重新分配，以提高資源的利用率。然而，在加入RS後的系統，細胞間干擾(inter-cell interference)的問題仍是影響傳輸品質與系統容量的因素，尤其是在細胞邊緣(cell edge)的用戶更是明顯。雖然使用頻率重用可以增加整個系統頻譜利用率，但過多的頻率重用會增加系統結構的複雜度及增加干擾，反而影響訊號傳輸品質。
本論文針對在不同基站(Base Station，BS)所屬的系統下使用RS，探討對其所服務的cell邊緣與鄰近cell邊緣之間容易發生共用子通道(co-channel)的問題。本論文提出IFR (Improved Soft Frequency Reuse)方法，對cell內所有的RS在資源配置的順序排程上做調整，分別為cell中心區與cell邊緣區設計不同的演算法。並將cell規劃成三個sector分別配置所屬的RS，採用動態干擾協調以達到最有效率的資源配置，將干擾值降低以提高訊號雜訊比（Signal to Interference plus Noise Ratio，SINR），來達到提升cell邊緣及整體系統吞吐量（Throughput）的目的。
Considering the relay station (Relay Station, RS) configuration, LTE-A system is presented to the public. The introduction of the RS changes the network architecture. At the same time, it makes the system re-allocating radio resources in order to improve resource utilization. However, after adding RS, problems of interference between cells still affect the transmission quality and system capacity, especially for those users of cell edge. Although the frequency reuse can increase spectral efficiency of the system, too much of this will increase the system complexity of the structure and increase interference. That will affect the signal transmission quality.
This thesis proposes the IFR (Improved Soft Frequency Reuse) method. It improves co-channel Interference problem of using RS systems between the cell edge and adjacent cell edge. IFR adjusts allocations of all RS resources and designs different algorithms for cell edge and cell central region. We divide the cell into three sectors and arrange two RSs into one sector. We use dynamic interference coordination to achieve the most efficient allocation of resources.
And then it reduces the interference to improve the SINR (Signal to Interference plus Noise Ratio) and system throughput.
第一章 緒論 1
1.1 LTE-A介紹 1
1.2 中繼技術與中繼站分類 3
1.2.1 中繼站主要功能 4
1.2.2 RS功能層級分類與拓樸架構 4
1.2.3 RS與BS的資源管理模式 6
1.3多點協作CoMP 7
1.4問題描述與動機 10
1.5論文架構 11
第二章 相關研究 13
2.1 LTE-A系統概述 13
2.1.1 LTE-A下行鏈路傳輸技術 13
2.1.2 LTE-A下行鏈路數據傳輸 16
2.1.3 MIMO概念 17
2.2 LTE-A的干擾協調技術 19
2.2.1 部分頻率重用(FFR) 20
2.2.2 軟式頻率重用(SFR) 21
2.2.3不同干擾協調/避免技術的比較 24
2.3 LTE-A加入Relay的頻率劃分與重用方法 24
2.3.1 Part-Frequency-7 (PF7) 25
2.3.2 Part-Frequency-4 (PF4) 26
2.3.3 Partial Reuse Scheme (PR) 26
2.3.4 Full Reuse Scheme (FR) 27
2.4共用子通道干擾(co-channel interference)分析 28
2.4.1 頻譜使用效率與干擾 32
2.5資源分配演算法 34
2.5.1 Round Robin排程演算法 34
2.5.2 Maximum C/I排程演算法 35
2.5.3 Proportional Fair排程演算法 35
第三章 研究方法 37
3.1問題分析 37
3.2 改良部分頻率重用方法(IFR) 38
3.2.1 Cell架構 40
3.2.2 中心分配演算法 41
3.2.3邊緣分配演算法 42
3.3 干擾分析 46
3.3.1 中心用戶的干擾分析 46
3.3.2 邊緣用戶的干擾分析 48
3.3.3 Cell容量及性能計算 50
第四章 模擬實驗與結果分析 52
4.1 模擬流程 52
4.2 模擬實驗 55
4.3 實驗結果 61
第五章 結論與未來研究 63
5.1 結論 63
5.2 未來研究 64
參考文獻 67
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