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    Please use this identifier to cite or link to this item: http://ccur.lib.ccu.edu.tw/handle/A095B0000Q/776


    Title: 以LoRa為基礎之無線網狀網路通訊模組的設計與分析;Design and Analysis of a LoRa-based Wireless Mesh Networking Module
    Authors: 柯凱翔;KE, KAI-SIANG
    Contributors: 通訊工程研究所
    Keywords: 物聯網;無線感測網路;LoRa;LoRa;Internet of Things;Low-Power Wide Area Network
    Date: 2017
    Issue Date: 2019-07-17 10:47:47 (UTC+8)
    Publisher: 通訊工程研究所
    Abstract: 物聯網使數以萬計的節點透過網際網路分享資訊,這些節點資訊透過有效的利用可以達到許多應用,例如城市內的交通控制、環境監控等。目前常見的通訊技術應用範圍大部分是應用於個人網路(PAN)或是小區域的網路(LAN),如Wi-Fi、ZigBee和BLE等。這些無線技術傳輸距離較短,比較不適合應付大範圍的節點運作。本研究探討新興無線技術LoRa,以低速率、長距離且低耗電的特性,適合應用於長距離的無線傳輸。本研究整合Mesh Network架構,開發出一個基於LoRa的無線網狀網路通訊模組Bonora,其特點為不受限於類似LoRaWAN的星狀網路設計,而可以透過多跳來傳輸資料,提升傳輸成功率。針對室內或是建築物的阻隔所造成通訊不良的影響,Bonora以多跳方式將感測資料回傳,提高封包傳輸成功率。我們把19個節點佈建在中正大學校園600公尺乘800公尺範圍內,實驗結果顯示Bonora能透過多跳方式提高節點的傳輸成功率,所有節點的平均資料傳輸成功率達88.5%;在本實驗架構下若是採用LoRaWAN之星狀網路架構平均傳輸成功率僅剩58.7%。最後,本研究以訊號強度(Received Signal Strength Indicator, RSSI)與訊雜比(Signal-to-noise ratio, SNR)歸納出推估傳輸成功率(Packet Delivery Ratio, PDR)的模型。使用者透過此模型可以了解當前節點的通訊狀況,用以調整網路中節點,提高傳輸成功率。
    LoRa, an emerging wireless technology, is examined for long range communication performance in a large area. Although LoRa shows good performance for long-distance transmission in the countryside, its radio signals can be attenuated and interfered with by buildings, trees and other signal sources. In urban areas, our observation shows that LoRa requires a dense deployment of LoRa gateways to ensure that indoor LoRa devices can transfer data back to remote servers. Mesh networking is a solution for increasing the communication range and packet delivery ratio without the need to install additional LoRa gateways. This study presents our design of a LoRa mesh-networking module, the Bonora, for IoT applications (e.g.,collecting data from multiple, widely distributed sensors on a university campus). We deployed 19 LoRa mesh-networking devices distributed in an 800m by 600m area on campus to serve as a gateway and to collect data at one-minute intervals. The results show our LoRa mesh networking module achieved a 88.49% packet delivery ratio (PDR), while the LoRaWAN in star-network topology was only 58.7% under the same conditions.
    Appears in Collections:[通訊工程研究所] 學位論文

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