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http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/70721
標題: | 工廠無線物聯網之動態網路規劃及管理 On Dynamic Network Planning and Management for Industrial Wireless IoT Networks |
作者: | Pai-Chun Yen 顏百均 |
指導教授: | 蔡志宏(Zse-hong Tsai) |
關鍵字: | 自動化工廠,無線物聯網,服務品質,動態網路規劃, Automation factory,wireless IoT network,quality of service,dynamic network planning, |
出版年 : | 2018 |
學位: | 碩士 |
摘要: | 隨著工業4.0的興起,工廠環境中之所有感測器、資料收集裝置、數據分析裝置等,皆朝著高度自動化為目標進行發展。而在高度自動化工廠環境中,必定會有許多的裝置採用無線傳輸技術進行資料傳輸,在頻譜資源有限的情形下,各裝置間勢必會造成嚴重的無線通道爭搶與干擾行為。該如何對工廠內無線裝置進行動態網路控制及管理便是此研究所著重的部分。本研究將工廠內裝置種類分為兩大類,其一為對於流量大小有所要求之高流量裝置與資料收集裝置;其二為對於封包延遲時間有高度要求之延遲敏感裝置。各種裝置對於其服務品質標準也有其一定的規範,透過本研究所設計之演算法將試圖使所有工廠內無線裝置均能夠滿足其服務品質標準。
本研究所提出之主動式裝置連線控制管理法(PQDA)共分成三大階段,1.)AP頻率選擇階段,2.)裝置連線選擇,3.)工廠裝置運行控制階段。在第一階段中,將會透過修改基本的著色演算法,使工廠內AP皆能夠避開同頻與鄰頻干擾的發生,最大化工廠所能承載之流量上限。於第二階段中,將透過流量估算以及透過模擬所得出之規則,進行裝置連線目標AP的選擇,試圖最大化工廠內可滿足其服務品質要求之裝置數量。而第三階段則是在工廠開始運作的情形下,透過預先評估新裝置加入後將帶來的干擾,而事先進行各連線中裝置的調整,最小化裝置進出網路所帶來之擾動。 而本研究在最後也透過模擬驗證了PQDA方法之可行性以及其所具備之優點,並與常見之無線網路管理辦法進行比較。不論是在何種工廠情境下PQDA方法皆能夠有所適應,並且使工廠內多數裝置均能夠滿足其工業級服務品質要求。 With the rise of Industry 4.0, various kinds of sensors, data collection devices, and data analysis devices in the factory environment are now quickly developed toward high degree factory automation. In such factory environment, there must be many devices that make use of wireless transmission technology for their data transmissions. However, due to limited spectrum resources, there can be serious channel contention and interference behavior among these wireless devices. How to control and manage these wireless devices in the factory is the key part of this research. In this thesis, the types of devices are assumed to fall into two main categories. The first one is the high throughput device and data collection device with requirement of high throughput. The second is the delay sensitive device with strict requirement on packet delay time. The algorithm designed through this research will attempt to allow all devices to meet their QoS requirements as much as possible among the aforementioned constraints. In this thesis, a novel approach called the Proactive QoS-aware Device Access Control Method(PQDA) is proposed. The PQDA method includes three major phases. i.) The AP frequency selection phase, ii.) device transmit target selection phase, and iii.) The device control phase. In the first phase, by modifying the Welsh-Powell Algorithm, the APs in the factory can avoid co-channel or near-band interferences, in order to maximize the overall wireless network capacity. In the second phase, by estimating the throughput of devices, and design rules derived from the simulation, we develop an approach to maximize the number of devices meeting their QoS requirements. In the last phase, while the factory is actually working, the factory can respond in advance, one step earlier to reduce the occurrence of disturbance by estimating the impact of devices before joining the wireless network. In the final part of this study, the feasibility of PQDA and its advantages are verified by simulations, and the results are compared with the performance obtained via common methods in traditional WiFi network management and planning approaches, proving that the PQDA method can be adapted in various kinds of factory environments, and enable most devices to meet their QoS requirements. |
URI: | http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/70721 |
DOI: | 10.6342/NTU201802732 |
全文授權: | 有償授權 |
顯示於系所單位: | 電信工程學研究所 |
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