臺灣博碩士論文加值系統

隨著第五代行動通訊技術(5G)的進步與普及化，這種新世代無線網路在諸多方面展現出卓越的性能，如極高的數據傳輸速率、低延遲以及高可靠性等。然而，對於特殊情境，例如戰爭或其他緊急狀況，地面通訊設施可能會面臨嚴重破壞，從而導致通訊中斷，這無疑將對緊急反應與危機處理造成重大障礙。
在本研究中，探索了一種新的通訊策略，那就是將5G O-RAN系統與中地球軌道(MEO)衛星通訊相結合，以因應這些挑戰並擴展通訊網路的應用範疇。假設在地面基礎設施遭受重創或無法運作的情境下，衛星通訊系統可以作為一個重要的替代方案，提供穩定而可靠的通訊服務。
本研究將分析和評估這種結合應用的實際效能，包括傳輸速度、延遲時間、覆蓋範圍以及在惡劣環境下的可靠性等。通過在正常使用的情況下不會斷線驗證了可靠性，以及延遲方面，衛星訊號不可避免的有大約250ms左右的延遲。而傳輸速率幾乎可以將訊號源的完整地傳播出來，即使訊號不佳時亦可以通過不同的調變方式以及有效的頻譜利用來盡可能地達到通訊的功用。在未來的工作中，也將繼續探討這種結合應用如何進一步優化在商業與工業中的實際價值，包括其在物聯網(IoT)應用、遠程醫療、自動駕駛、智慧城市等新興領域的可能應用。

As the advancement and popularization of the fifth-generation mobile communication technology (5G) continues, this new generation of wireless networks demonstrates superior performance in various aspects, such as extremely high data transmission rates, low latency, and high reliability. However, in special circumstances, such as war or other emergencies, ground communication facilities may face severe damage, leading to communication interruption, which undoubtedly poses significant obstacles to emergency response and crisis management.
In this research, we explore a new communication strategy that combines the 5G O-RAN system with Medium Earth Orbit (MEO) satellite communications to address these challenges and expand the scope of application of communication networks. Supposing that in scenarios where ground infrastructure is severely damaged or unable to function, satellite communication systems can serve as an important alternative, providing stable and reliable communication services.
This study will analyze and evaluate the actual performance of this integrated application, including transmission speed, delay time, coverage range, and reliability in challenging environments. The reliability has been verified by ensuring uninterrupted connectivity under normal usage. In terms of delay, it is inevitable to have an approximate delay of around 250ms due to satellite signals. However, the transmission speed can effectively propagate the complete signal source, and even under poor signal conditions, communication functionality can be achieved through different modulation schemes and efficient spectrum utilization.
In future work, further exploration will be conducted on how to optimize the practical value of this integrated application in commercial and industrial contexts. This includes its potential applications in emerging areas such as the Internet of Things (IoT), telemedicine, autonomous driving, and smart cities.

摘 要 i
ABSTRACT iii
誌 謝 v
目錄 vi
圖目錄 ix
表目錄 xi
第一章 緒論 1
1.1 前言 1
1.2 研究動機與目的 1
1.3 論文大綱 2
第二章 相關研究與背景 4
2.1 5G通訊系統 4
2.1.1 無線通道基本概念 5
2.1.2 5G NR 6
2.1.3 5G核心網路(5G Core Network) 6
2.2 開放無線接入網路 7
2.2.1 CU 9
2.2.2 DU 11
2.2.3 RU 11
2.3 衛星通訊系統 12
2.3.1 路徑損耗(Pass Loss) 13
2.3.1.1 自由空間傳播(Free Space Propagation) 14
2.3.1.2 大氣折射 15
2.3.1.3 地面傳播 16
2.3.2 衛星通訊系統組成 16
2.3.2.1 通訊衛星 16
2.3.2.2 地面站 16
2.3.2.3 用戶終端 17
2.3.3 衛星通訊系統的類型 17
2.3.3.1 中地球軌道系統 18
2.3.3.2 地球靜止軌道系統 19
2.3.3.3 低地球軌道系統 19
第三章 系統架構與實驗方法 20
3.1 研究目標與方法 20
3.2 系統架構 21
3.3 場域環境 22
3.4 實驗設備 23
3.4.1 訊號源 24
3.4.1.1 SD WAN 24
3.4.1.2 中軌道衛星系統 25
3.4.1.3 有線網路 25
3.4.2 5G O-RAN 30
3.4.2.1 RU 30
3.4.2.2 O-RAN伺服器 31
3.4.3 用戶端設備 34
3.4.3.1 Samsung S23 34
第四章 數據分析與比較 36
4.1 延遲性能分析 39
4.1.1 有線網路 39
4.1.2 MEO衛星通訊系統 41
4.2 傳輸速率分析 42
4.2.1 有線網路 43
4.2.2 MEO衛星通訊系統 45
4.3 比較與分析 48
第五章 結論與未來展望 52
5.1 結論 52
5.2 未來展望 53
參考文獻 54

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