隨著具備連網能力之智慧裝置的普及，搭配先進的無線網路傳輸技術，智慧感知網路生活圈：物聯網 (IoT) 逐漸形成。無線網路的應用服務發展越來越多元，使得網路服務除了傳統資料的交換外，強調即時性的影音串流服務例如VoIP與Video串流的需求量也日益劇增，以至於現有的傳輸層協定在無線傳輸下無法完全滿足所有服務資源的需求。因此，如何改善舊有的傳輸層協定，使其更適合使用在無線傳輸環境中已成火紅的議題。
本論文提出了使用新型態的傳輸層協定：串流控制傳輸協定 ( SCTP )，搭配跨層協調(Cross-layer cooperation)能即時取得底層通道狀況，依據不同的傳輸錯誤成因，將傳輸錯誤成因分為冗餘封包的產生、通道碰撞、隨機分散式遺失三個部分，提出相對應的機制減緩傳輸錯誤的發生，解決舊有傳輸層無法準確依據當前網路狀態做及時調整的問題，並符合各封包的服務品質需求 (QoS)。
從模擬結果可以明顯看出，本論文所提出的機制在隨機分散遺失模型(Random loss model)中能有效減少端對端延遲 (End-to-End delay )和提升整體平均有效吞吐量( Average Goodput )，足以證明我們所提出的方法非常適合推廣到變動性且變異性高的無線物聯網中使用。

The popularity of smart phones makes people increasingly dependent on wireless networks. Nowadays, through the uprising of a Sensor Network environment, the Internet of Things (IoT) is gradually forming. Network application services has become more diverse, leading to conventional transmission protocols in wireless environment not being able to meet all service resources.

In heterogeneous networks, transmission error can be divided into three categories such as signal fading, collision, and random loss. We proposes new Stream Control Transmission Protocol (SCTP) mechanisms, to improve network performance. Taking into consideration the QoS requirements of packets, our method can provide good goodput for real-time transmission and maintain less end-to-end delay.

Apparent from the simulation results, our proposed method has performed well in random loss model. Not to mention, our approach has less delay time and high goodput in our simulation results. This is enough to prove that our proposed method is extremely suitable for promotion for its use in the highly flexible and variable wireless Internet of Things (IoT).

學位論文審定書 i
摘要 ii
Abstract iii
目錄 iv
圖目錄 vi
表目錄 viii
第一章 導論 1
1.1 前言 1
1.2 研究動機 4
1.3 論文架構 5
第二章 技術背景與相關文獻 6
2.1 串流控制傳輸協定(SCTP)介紹 6
2.2 SCTP特性 8
2.3 SCTP資料傳輸方式 13
2.4 PR-SCTP部分可靠傳輸 18
第三章 協定機制制定 21
3.1 情境假設 22
3.2 冗餘重傳封包預測機制 24
3.2.1 機制運作方法 24
3.2.2 無線端冗餘封包偵測 25
3.2.3 有線端冗餘封包偵測 30
3.3 協調通道碰撞機制 37
3.3.1 機制運作方法 37
3.3.2 PR-SCTP機制 37
3.3.3 封包排程機制 42
3.4 換手評估機制 44
3.4.1 問題描述 44
3.4.2 機制運作方法 45
第四章 模擬實驗與結果分析 47
4.1 NS2簡介 47
4.2 NS2模組修改 47
4.3 模擬環境設定與各類參數設定 49
4.4 模擬結果與分析 52
4.4.1 評測項目 52
4.4.2 數據分析 53
第五章 結論 63
參考文獻 64

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