使用多代理人強化學習於無線快取網路設計空中基地台三維路徑之研究

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廖鍇旻(Kai-Min Liao) 查詢紙本館藏

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通訊工程學系

論文名稱

使用多代理人強化學習於無線快取網路設計空中基地台三維路徑之研究
(3D Trajectory Design in Aerial-Terrestrial Wireless Caching Networks Using Multi-Agent Reinforcement Learning)

相關論文

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至系統瀏覽論文 (2024-9-1以後開放)

摘要(中)

在本論文中，我們考慮一個無線裝置間通訊（Device-to-device, D2D）網路，藉由在三維空間中設計具快取功能無人機的最佳路徑，以最大化長期網路吞吐量。由於能將熱門內容快取在鄰近移動用戶中，D2D 快取能夠有效提升網路吞吐量並減輕網路後傳負擔。此外，無人機因為具有高移動性以及可靈活布署等特徵，所以將其視為飛行基站的研究也漸漸受到關注。使用具快取功能的無人機可以追蹤用戶的移動模式，並藉由有限的快取儲存空間提供服務。然而，由於動態環境中具有頻繁變化的網路拓撲，在需同時考慮到空中與地面快取節點的情況下，設計出最佳的無人機路徑軌跡具有一定的挑戰性。針對此挑戰，我們提出了一種基於多代理人強化學習的新穎框架，該框架能在不需中央協調器的情況下以分布式學習設計出每台無人機的最佳三維路徑。在所提出之方法中，一定距離內的多台無人機可以透過共享經驗來共同決定飛行決策。模擬結果展示了我們的演算法優於傳統的單代理人以及多代理人Q學習演算法。本論文將具有快取功能的無人機作為地面 D2D 快取網路的重要輔助，並證實其可行性以及有效性。

摘要(英)

This paper investigates a dynamic 3D trajectory design of multiple cache-enabled unmanned aerial vehicles (UAVs) in a wireless device-to-device (D2D) caching network with the goal of maximizing the long-term network throughput. By storing popular content at the nearby mobile user devices, D2D caching is an efficient method to improve network throughput and alleviate backhaul burden. With the attractive features of high mobility and flexible deployment, UAVs have recently attracted significant attention as cache-enabled flying base stations. The use of cache-enabled UAVs opens up the possibility of tracking the mobility pattern of the corresponding users and serving them under limited cache storage capacity. However, it is challenging to determine the optimal UAV trajectory due to the dynamic environment with frequently changing network topology and the coexistence of aerial and terrestrial caching nodes. In response, we propose a novel multi-agent reinforcement learning based framework to determine the optimal 3D trajectory of each UAV in a distributed manner without a central coordinator. In the proposed method, multiple UAVs can cooperatively make flight decisions by sharing the gained experiences within a certain proximity to each other. Simulation results reveal that our algorithm outperforms the traditional single- and multi-agent Q-learning algorithms. This work confirms the feasibility and effectiveness of cache-enabled UAVs which serve as an important complement to terrestrial D2D caching nodes.

關鍵字(中)

★ 無人機
★ 路徑設計
★ 無線快取
★ 多代理人強化學習

關鍵字(英)

★ Unmanned aerial vehicles (UAVs)
★ trajectory design
★ wireless caching
★ multi-agent reinforcement learning

論文目次

論文摘要................................................................................................. i
Abstract.................................................................................................... ii
目錄............................................................................................................. iv
圖目錄......................................................................................................... v
表目錄......................................................................................................... vi
一、緒論..................................................................................... 1
1.1 研究背景. . . . . . . . . . . . . . . . . . . . . . . . 1
1.2 研究動機與目的. . . . . . . . . . . . . . . . . . . . 2
1.3 論文架構. . . . . . . . . . . . . . . . . . . . . . . . 3
二、文獻探討............................................................................. 4
三、系統模型............................................................................. 7
3.1 網路模型. . . . . . . . . . . . . . . . . . . . . . . . 7
3.2 通道模型. . . . . . . . . . . . . . . . . . . . . . . . 8
3.2.1 無人機對地通道模型. . . . . . . . . . . . . . . . . . 9
3.2.2 地對地通道模型. . . . . . . . . . . . . . . . . . . . 10
3.3 快取模型. . . . . . . . . . . . . . . . . . . . . . . . 11
四、空對地無線快取網路中的內容傳輸................................. 13
4.1 內容傳輸方式. . . . . . . . . . . . . . . . . . . . . . 13
4.1.1 無人機對裝置通訊鏈路成功傳輸率. . . . . . . . . . 14
4.1.2 裝置間通訊鏈路成功傳輸率. . . . . . . . . . . . . . 15
4.1.3 基站對裝置通訊鏈路成功傳輸率. . . . . . . . . . . 17
4.2 問題闡述. . . . . . . . . . . . . . . . . . . . . . . . 17
五、以基於獨立代理人強化學習設計三維無人機路徑......... 21
5.1 基於K-means分群演算法的無人機初始布建位置. . 21
5.2 基於獨立Q-learning之路徑設計. . . . . . . . . . . . 22
六、以協作式多代理人強化學習設計三維無人機路徑......... 25
6.1 演算法設計. . . . . . . . . . . . . . . . . . . . . . . 26
6.2 基於協作式多代理人強化學習之演算法分析. . . . . 30
6.2.1 收斂性分析. . . . . . . . . . . . . . . . . . . . . . . 30
6.2.2 複雜度分析. . . . . . . . . . . . . . . . . . . . . . . 32
七、模擬結果與分析................................................................. 33
八、未來研究方向及議題......................................................... 44
8.1 前言背景. . . . . . . . . . . . . . . . . . . . . . . . 44
8.2 衛星星座快取網路. . . . . . . . . . . . . . . . . . . 47
8.3 衛星輔助快取無人機網路. . . . . . . . . . . . . . . 48
8.4 全球覆蓋之高性能非地面網路. . . . . . . . . . . . . 50
8.5 延遲導向之衛星輔助無人機多接取邊緣運算系統. . 50
九、結論與貢獻......................................................................... 52
參考文獻..................................................................................................... 53
附錄一......................................................................................................... 63

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指導教授

陳昱嘉(Yu-Jia Chen)

審核日期

2021-3-4

推文