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姓名	傅仰紹(Yang-Shao Fu)  查詢紙本館藏	畢業系所	資訊工程學系
論文名稱	低軌道衛星地面網路中的DRX機制設計 (A DRX Mechanism for LEO Satellite-Terrestrial Network)
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檔案	[Endnote RIS 格式]    [Bibtex 格式]    [相關文章]   [文章引用]   [完整記錄]   [館藏目錄]   至系統瀏覽論文 ( 永不開放)
摘要(中)	隨著網絡不斷增長的需求使低地球軌道 (Low-Earth Orbit, LEO) 衛星地面網絡成為一個有吸引力的選擇。LEO衛星地面通信具有距離遠、移動速度快的特點，導致傳輸延遲和路徑損耗的不確定性，導致地面終端用戶（User Terminal, UT）難以確定合適的DRX（Discontinuous Reception）策略來減少能源消耗。本文中提出了一種用於 LEO 衛星地面傳輸的 DRX 模型，該模型應用了子狀態並引入了新的狀態，延遲狀態，以適應傳輸的變化。模擬結果顯示了本文提出的 DRX 模型對節能性能和延遲測量的影響，並為影響能源消耗和平均延遲的結果提出了對應的見解。
摘要(英)	The rising demand for networks makes low-earth orbit (LEO) satellite-terrestrial networks an attractive option. LEO satellite-terrestrial communications have the characteristics of large distance and fast-moving speed result in delay and path loss uncertainty, which will lead terrestrial user terminals (UTs) hard to determine suitable DRX (discontinuous reception) strategy to enhance the performance. In this thesis, we propose a new DRX model for LEO satellite-terrestrial transmissions that applies substates and introduces a new state, Delay State, to accommodate changes in transmissions. We further analyze the power saving factor and average delay of the model. Simulation results show the impact of our DRX model on power saving performance and latency measurements, and provide corresponding insights into the results affecting energy consumption and average delay.
關鍵字(中)	★ DRX ★ 衛星地面網路	關鍵字(英)	★ DRX ★ Satellite-terrestrial Networks
論文目次	中文摘要 i Abstract ii Contents iii List of Figures v List of Tables vi 1 Introduction 1 2 Background 3 3 Related Work 6 4 Proposed DRX Mechanism 8 4.1 Flexible Substate Strategy . . . . . . . . . . . . . . . . . . . . . . . . . 8 4.2 Delay State . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 5 Technical Analysis 13 5.1 Traffic Model . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 5.2 Power Saving Factor . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17 5.3 Average Delay . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21 5.4 Analysis of the Delay State with a General Power Saving Model . . . . . 22 6 Performance and Evaluation 24 iii 7 Conclusion 28 Bibliography 29
參考文獻	[1] Study on New Radio (NR) to support non-terrestrial networks, 3GPP, Sep. 2020, TR 38.811 V15.4.0. [2] X. Lin, S. Rommer, S. Euler, E. A. Yavuz, and R. S. Karlsson, “5g from space: An overview of 3gpp non-terrestrial networks,” IEEE Communications Standards Magazine, vol. 5, no. 4, pp. 147–153, 2021. [3] H.-W. Ferng and T.-H. Wang, “Exploring flexibility of drx in lte/lte-a: Design of dynamic and adjustable drx,” IEEE Transactions on Mobile Computing, vol. 17, no. 1, pp. 99–112, 2018. [4] F. Moradi, E. Fitzgerald, and B. Landfeldt, “Modeling drx for d2d communication,” IEEE Internet of Things Journal, vol. 8, no. 4, pp. 2574–2584, 2021. [5] M. R. Ghavidel Aghdam, B. Rahmani, and R. Abdolee, “Traffic-based adjustable discontinuous reception mechanism with bounded delay,” in 2021 16th Annual Conference on Wireless On-demand Network Systems and Services Conference (WONS), 2021, pp. 1–6. [6] S. Gao, H. Tian, J. Zhu, and L. Chen, “A more power-efficient adaptive discontinuous reception mechanism in lte,” in IEEE Vehicular Technology Conference (VTC Fall), 2011, pp. 1–5. [7] K.-C. Ting, H.-C. Wang, C.-C. Tseng, and F.-C. Kuo, “Energy-efficient drx scheduling for qos traffic in lte networks,” in IEEE Ninth International Symposium on Parallel and Distributed Processing with Applications, 2011, pp. 213–218. 29 [8] J.-M. Liang, J.-J. Chen, H.-H. Cheng, and Y.-C. Tseng, “An energy-efficient sleep scheduling with qos consideration in 3gpp lte-advanced networks for internet of things,” IEEE Journal on Emerging and Selected Topics in Circuits and Systems, vol. 3, no. 1, pp. 13–22, 2013. [9] J. Zhou, G. Feng, T.-S. P. Yum, M. Yan, and S. Qin, “Online learning-based discontinuous reception (drx) for machine-type communications,” IEEE Internet of Things Journal, vol. 6, no. 3, pp. 5550–5561, 2019. [10] D. E. Ruíz-Guirola, C. A. Rodríguez-López, S. Montejo-Sánchez, R. D. Souza, and M. A. Imran, “Drx-based energy-efficient supervised machine learning algorithm for mobile communication networks,” IET Communications, vol. 15, no. 7, pp. 1000– 1013, 2021. [11] Universal Mobile Telecommunications System (UMTS); Selection procedures for the choice of radio transmission technologies of the UMTS, European Telecommunications Standards Institute (ETSI), 1998, TR 101 112. [12] L. Zhou, H. Xu, H. Tian, Y. Gao, L. Du, and L. Chen, “Performance analysis of power saving mechanism with adjustable drx cycles in 3gpp lte,” in IEEE 68th Vehicular Technology Conference, 2008, pp. 1–5. [13] L. Kleinrock, Queueing Systems, Volume I. John Wiley, 1975. [14] R1-071284, 3GPP, March. 2007. [15] R2-071285, 3GPP, March. 2007.
指導教授	張貴雲(Guey-Yun Chang)	審核日期	2022-9-6
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