逄愛君臺灣大學：資訊工程學研究所林俊仁Lin, Jiun-RenJiun-RenLin2007-11-262018-07-052007-11-262018-07-052006http://ntur.lib.ntu.edu.tw//handle/246246/54048本論文提出一個VoIP系統上之點對點即按即說服務，稱之為iPTT。在iPTT上，我們展示了一個分散式並且不受限於行動通訊業者之網路架構，以加速PTT服務之推廣。基於我們提出的架構，我們也設計了通話建立及結束的訊息流程以展現iPTT架構的可行性。此外，我們提出兩種即時發話權決定機制，分別為Flooding-based Floor Control Mechanism (FFC) 與Tree-based Floor Control Mechanism (TFC)。對於所提出的發話權決定機制，透過我們所發展的數學分析與模擬模型來評估其效能。而其效能之優劣取決於決定過程所需的時間與訊息數量。This thesis proposes iPTT, a peer-to-peer Push-to-Talk (PTT) service for Voice over IP (VoIP). In iPTT, a distributed and mobile-operator independent network architecture is presented to accelerate the deployment of the PTT service. Based on the proposed architecture, the message flows for call establishment/teardown are designed to show the feasibility of iPTT. Also, we propose two mechanisms for real-time talk-burst determination, flooding-based floor control mechanism (FFC) and tree-based floor control mechanism (TFC). In terms of the determination latency and the number of floor-control message exchanges, the performance of the proposed floor control mechanisms is investigated through our analytical and simulation models.List of Tables . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . vii List of Figures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . viii Chapter 1 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 Chapter 2 Network Architecture and Message Flows for iPTT . . . . . 4 2.1 iPTT Network Architecture . . . . . . . . . . . . . . . . . . . . . . . . . 4 2.2 iPTT Signaling Message Flows . . . . . . . . . . . . . . . . . . . . . . . . 7 Chapter 3 Real-time Floor Control . . . . . . . . . . . . . . . . . . . . . 13 3.1 Flooding-based Floor Control . . . . . . . . . . . . . . . . . . . . . . . . 15 3.2 Tree-based Floor Control . . . . . . . . . . . . . . . . . . . . . . . . . . . 17 Chapter 4 Performance Evaluation . . . . . . . . . . . . . . . . . . . . . 19 4.1 Input Parameters and Output Measures . . . . . . . . . . . . . . . . . . 19 4.2 Analytical Modeling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20 4.2.1 Derivation of Tl for FFC . . . . . . . . . . . . . . . . . . . . . . . 21 4.2.2 Derivation of Tl for TFC . . . . . . . . . . . . . . . . . . . . . . . 26 4.3 Simulation and Numerical Results . . . . . . . . . . . . . . . . . . . . . . 28 Chapter 5 Conclusion . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32 Bibliography . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 331948804 bytesapplication/pdfen-US即按即說點對點網路語音服務Push-to-TalkPeer-to-peerVoIPthesishttp://ntur.lib.ntu.edu.tw/bitstream/246246/54048/1/ntu-95-R93922042-1.pdf