基於DDS通訊協定之QoS驗證與優化模擬系統｜國立中央大學博碩士論文系統

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研究生：	邱柏鈞 Po-Chun Chiu
論文名稱：	基於DDS通訊協定之QoS驗證與優化模擬系統 An emulation system for DDS QoS validation and performance optimization
指導教授：	王尉任 Wei-Jen Wang
口試委員:
學位類別：	碩士 Master
系所名稱：	資訊電機學院 - 資訊工程學系 Department of Computer Science & Information Engineering
論文出版年：	2020
畢業學年度：	108
語文別：	中文
論文頁數：	101
中文關鍵詞：	物聯網、DDS 、QoS 策略驗證、QoS 策略優化、模擬系統
外文關鍵詞：	IOT, DDS, QoS validation, QoS recommendations, emulation platform
相關次數：	點閱：12 下載：0
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　　隨著工業物聯網技術的興起，在大型物聯網系統中，傳統點對點 (Point-to-Point) 的網路傳輸容易讓系統變成複雜的結構體系。因此，使用 Publishe/Subscribe 的通訊架構能夠減少系統的複雜度，而且易於設計與維護龐大的物聯網系統。Object Management Group (OMG) 提出基於 Publishe/Subscribe 通訊架構的 Data Distribution Serivce (DDS) 標準，它提供豐富的 QoS 策略，能夠針對不同情境的系統進行配置。但是由於 QoS 策略的複雜性導致容易錯誤地調整其參數，造成設備無法正常通訊的情況，也無法容易地調校系統的效能。
　　故本研究為基於 DDS 通訊協定提出一套模擬平台，為了降低調校 QoS 策略的門檻，該平台能夠藉由一個基於 YAML 的 DDS 系統描述語言設定通訊架構，並且驗證 QoS 策略的一致性與相容性同時降低設定 QoS 策略錯誤的機率。此外，基於 DDS模擬的效能報告，提供效能 Reliability 與 Timeliness 的 QoS 策略優化建議，藉此提升 DDS 系統的效能。

With the rise of industrial Internet of Things technology, in large-scale Internet of Things systems, traditional point-to-point network transmission is easy to make the system into a complex relationship. Therefore, using the publisher/subscriber communication architecture can reduce the complexity of the system, and it is easy to design and maintain a huge IoT system. Object Management Group (OMG) proposes the Data Distribution Serivce (DDS) standard based on the publish/subscribe communication architecture, which provides rich QoS policies and can be configured for systems in different scenarios. However, due to the complexity of the QoS policy, it is easy to adjust its parameters incorrectly, resulting in the situation that the device cannot communicate normally, and the performance of the system cannot be easily adjusted.
Therefore, this study proposes an emulation platform based on the DDS communication protocol. In order to lower the threshold for tuning QoS policies, the platform can set the communication architecture through a YAML-based DDS system description and verify the consistency and compatibility of QoS policies. At the same time reduce the probability of setting QoS policy error. In addition, based on the performance report of DDS emulation, it provides recommendations for QoS policies optimization of performance Reliability and Timeliness, thereby improving the performance of the DDS system.

摘要    i
Abstract    ii
目錄    iii
圖目錄    vi
表目錄    viii
一、 緒論    1
1-1.    研究背景    1
1-2.    背景知識    2
1-2-1.    Data Distribution Service    2
1-2-2.    Publish/Subscribe    2
1-2-3.    Quality of Service (QoS)    3
1-2-4.    Reliability 與 Timeliness 問題    4
1-3.    研究動機與目標    5
1-4.    論文架構    6
二、 系統設計    7
2-1.    DDS System Abstract Language    7
2-1-1.    YAML    8
2-1-2.    DSAL    9
2-1-3.    定義 QoS 策略    9
2-1-4.    定義 DDS 實體    10
2-1-5.    定義 DDS 通訊架構    11
2-2.    DDS 通訊架構視覺化    13
2-2-1.    Canvas    13
2-2-2.    視覺化 Topic    13
2-2-3.    視覺化 Device    14
2-2-4.    視覺化 Publisher    14
2-2-5.    視覺化 Subscriber    14
2-2-6.    視覺化 Data Writer    15
2-2-7.    視覺化 Data Reader    15
2-3.    DDS Eulation 設計    16
2-3-1.    Master-slave 架構    16
2-3-2.    Emulation 狀態    16
2-3-3.    Redis    17
2-3-4.    Redis 資料表    18
2-3-5.    Emulation 運行設計    19
2-3-6.    管理 Emulation 任務    20
2-4.    Emulation 效能報告    20
2-4-1.    Emulation 運行報告    21
2-4-2.    運行報告整合實作    24
2-5.    QoS 策略建議    26
三、 實驗與結果    29
3-1.    系統概觀    29
3-1-1.    DSAL 管理模組    29
3-1-2.    Emulation 管理模組    33
3-1-3.    Emulation 效能報告管理模組    35
3-1-4.    QoS 策略建議模組    36
3-2.    QoS 一致性驗證    37
3-2-1.    驗證 Durability Service QoS    37
3-2-2.    驗證 Lifespan QoS    38
3-2-3.    驗證 Resource Limits QoS    39
3-2-4.    驗證 Resource Limits, History QoS    39
3-2-5.    驗證 Time Based Filter, Deadline QoS    40
3-3.    QoS 相容性驗證    41
3-3-1.    驗證 Deadline QoS    41
3-3-2.    驗證 Destination Order QoS    42
3-3-3.    驗證 Durability QoS    43
3-3-4.    驗證 Latency Budget QoS    44
3-3-5.    驗證 Liveliness QoS    45
3-3-6.    驗證 Ownership QoS    46
3-3-7.    驗證 Presentation QoS    47
3-3-8.    驗證 Reliability QoS    48
3-4.    基於 QoS 的效能優化實驗    49
3-4-1.    實驗環境與佈署    49
3-4-2.    實驗一    49
3-4-3.    實驗二    50
3-4-4.    實驗三    52
四、 相關研究    54
五、 結論與未來研究方向    55
六、 參考資料    56

                                

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