臺灣博碩士論文加值系統

CoMP應用場景三在資料處理與後端網路連結不同於一般混合式網路中大小基地台皆要負責。與大基地台以高傳輸速率光纖連結的RRH只負責傳送資料，其他都由高功率基地台的資料處理單元與後端網路處理。然而混合式大小基地台網路中的大基地台負載常過重，因此將小型基地台的服務範圍延伸，為大基地台卸載一些流量。但如此一來基地台的數量增加也同時增加了基地台之間使用相同資源區塊所造成同頻干擾的可能性。同頻干擾會影響使用者的訊號品質、降低使用者的傳輸資料的速率、也減少系統的吞吐量。因此如何分配頻帶與有效的管理干擾便為一大議題。
本論文將探討在LTE-A中CoMP應用場景三中，使用不同基地台服務範圍延伸與不同資源區塊分配策略並佐以動態流量負載的方式來分析系統大基地台與RRH中使用者訊號品質與傳輸完成的情況。最後藉由模擬數據分析得出在大幅度的基地台服務範圍延伸方法可以讓本文提出的動態資源分配方法充分的發揮效用使得阻塞率比其他方式佳，以及頻譜效率也多了50%，改善了基地台邊界使用者的訊號品質、使基地台邊界傳輸成功的使用者數量大增。

CoMP Scenario 3 is different from the eNB and HeNB in the conventional hybrid network. Rather than connect each eNB with air-interface X2, gigabit optical fibers is adopted in CoMP Scenario 3. In addition, CoMP Scenario 3 use RRH as HeNB. RRH is only equipped with a transceiver which converts RF to and from digital IF signals. BBU in eNB process radio resource and network management functionalities. However, the more base stations deployed in hybrid network, the greater the Co-Channel Interference would be. Co-Channel Interference would not only lower UE’s SINR, transmitted data rate and system throughput but also increase the blocking Probability. Therefore, allocate RBs efficiently as to manage Co-Channel Interference would be a big challenge.
This thesis proposes cell range expansion and resource allocation with dynamic traffic in LTE-A CoMP scenario 3. With simulation results show that if cell range expansion bias value is greater enough, the dynamic resource allocation would be 50% better than statistic resource allocation in spectral efficiency and the dynamic resource allocation performs better than other strategies under 80Mbps without cell range expansion. In summary, the signal quality of cell edge user would be improved and the total number of successfully served users also increased by our dynamic resource allocation.

誌謝 i
摘要 i
Abstract ii
目錄 iii
圖目錄 v
表目錄 vii
第一章 緒論 1
1.1 前言 1
1.2 研究動機 1
1.3 論文章節介紹 3
第二章 背景介紹 4
2.1 第四代行動通訊簡介 4
2.1.1 通道頻寬及訊框結構 4
2.1.2 參考信號 7
2.2 基地台連接流程 9
2.2.1 基地台搜索 9
2.2.2 隨機存取流程 11
2.3 多點式協調傳輸 12
2.3.1 應用場景 12
2.3.2 傳輸模式 15
2.3.3 傳輸集合 16
第三章 研究方法 17
3.1 系統流程 17
3.2 干擾與資源區塊分配 19
3.2.1 固定式資源分配 20
3.2.1 動態式資源分配 21
3.3 基地台服務範圍延伸 22
第四章 模擬環境 24
4.1 環境架構 24
4.2 天線場型 25
4.3 遮蔽效應 25
4.4 路徑衰減模型 26
4.5 參數設定 26
4.6 話務模型 28
4.7 訊號與干擾雜訊比 29
4.8 系統吞吐量 30
第五章 模擬結果與數據分析 32
5.1 模擬程式流程 33
5.2 系統效能衡量標準 35
5.2.1 話務阻塞率 35
5.2.2 訊號品質 36
5.3 不同基地台服務範圍延伸的比較 36
5.4 不同資源區塊分配方式的比較 42
第六章 結論與未來展望 51
參考文獻 52

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