封包擁塞控制協議(Datagram Congestion Control Protocol，DCCP)是一個擁有壅塞控制機制的非可靠式傳輸層網路通訊協定，其特性適合用於多媒體資料串流。為了達到能流暢的同時使用多個DCCP網路介面傳輸串流資料，本篇碩士論文提出了多路徑封包擁塞控制協議(Multi-path Datagram Congestion Control Protocol，MP-DCCP)。在同時透過多組網路介面進行影音資料傳輸時，三個必須解決的議題為，(1)接收端較為無法依序收取傳送的封包，(2)影音串流資料中各個封包重要性的不同，(3)多介面網路傳輸提供的流量的穩定性。在本篇碩士論文中，針對前兩項議題提出了動態封包接收順序預測與封包分派機制 (Adaptive Ordering Predicting Scheduling，AOPS)。動態封包接收順序預測與封包分派機制能夠估計當封包透過各網路介面傳輸時接收端是否能盡量達到依序接收，並透過此項資訊在多個網路介面中進行封包的分派，以此減輕第一項議題。而透過此分派機制進行封包分派時也將考慮其封包的重要性以將封包分派至傳輸較穩定的網路介面。而針對第三項議題，本篇碩士論文提出了流量分散壅塞控制機制(Flow Sharing Congestion Control ,FSCC)以提供較為穩定的流量。當某一網路介面偵測到壅塞事件並降低提供的流量時，流量分散壅塞控制機制會在各介面能承受，不至於造成封包擁塞的狀況下提高其負擔的流量，藉此減緩在多介面網路傳輸中總體流量不穩定的狀況。
透過本篇碩士論文之模擬結果可以得知， MP-DCCP中的動態封包接收順序預測與封包分派機制的確可以改善多介面網路傳輸中無法依序接收封包的狀況，而MP-DCCP中的流量分散壅塞控制機制則可以減緩多介面網路傳輸中總體流量不穩定的狀況。

Datagram Congestion Control Protocol (DCCP) is an unreliable transport layer protocol with a congestion control mechanism used for multimedia streaming. In order to use multiple network interfaces to transmit streaming data smoothly, a Multi-Path Datagram Congestion Control Protocol (MP-DCCP) is proposed and presented in this thesis. Video streaming transmission through multi-path faces three problems: (1) unordering and untimely packets at the receiver side, (2) the importances of frames/packets are different and (3) total throughput’s stability of a multi-path transmission. This work proposes the Adaptive Ordering Predicting Scheduling (AOPS) scheme to relieve the first and the second problems. AOPS estimates packets’ arrival orders at the receiver side through these multiple paths and then derives packets’ transmission schedule at the sender side. A Flow Sharing Congestion Control (FSCC) mechanism for MP-DCCP is proposed in this work to tackle the third problem i.e., the total throughput’s stability. By distributing the flow loading from path X to other paths when a congestion event happened in path X, FSCC can relieve the unstable condition of total throughput. From the simulation results, we prove that higher goodput of the transmitted video can get in a finite time by using proposed AOPS scheme and the unstable condition of the total throughput in MP-DCCP can also be relieved using the proposed FSCC mechanism.

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[29] RFC Std. 5348-2003: “TCP Friendly Rate Control (TFRC): Protocol Specification” RFC std. 5348, January 2003.
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