應用於自適應性串流之隨機網路編碼多路徑傳輸控制方法;Random Network Coded Multipath TCP for DASH Streaming

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Title:	應用於自適應性串流之隨機網路編碼多路徑傳輸控制方法;Random Network Coded Multipath TCP for DASH Streaming
Authors:	歐煌仁;Ou, Huang-Ren
Contributors:	通訊工程學系
Keywords:	動態適應性串流技術;虛擬實境;網路編碼;多路徑傳輸;NS-3;DASH;VR;Network coding;MPTCP;NS-3
Date:	2019-01-25
Issue Date:	2019-04-02 15:01:05 (UTC+8)
Publisher:	國立中央大學
Abstract:	隨著現代網路技術的成長，許多人透過他們的行動裝置觀看影片。而隨著影片的傳輸量日漸增長，使用者的網路狀況將是一個問題。若在一個不好的網路情況下觀看高畫質影片，將會影響影片的播放流暢度，並會影響使用者體驗。為了解決這個問題，現代愈來愈多影片技術針對網路的狀況提出了解決方案。適應性串流技術是現在普遍的傳流技術，其目的是要讓使用者在不好的網路情況下，可以選擇較低的畫質觀看。不過，此技術雖然可以適應網路情況，但若一直持續播放低畫質影片，使用者因此也會受到影響。而當使用者若在體驗高畫質影片(如:VR)面臨網路不穩定時，其中的問題仍需要被關注。另外，為了提供較高的網路傳輸量，多路徑傳輸(Multipath-TCP)可以滿足影片使用者的需求。雖然現在有許多裝置支援多路徑技術，但其中可能面臨到的網路問題包括:排程、壅塞及路徑的匹配問題。本篇研究針對DASH串流使用者在多路徑網路不匹配下的探討，並提出SNC-MPTCP演算法來解決各種網路情況較差的環境。在演算法中，我們引入網路編瑪的技術並將其理論的解碼計算式套用在其中，來應付網路較差的環境，進而提高網路傳輸及影片畫質的表現。本實驗實作於NS-3模擬器，並設置不同影片傳輸速率來模擬一般影片和VR影片的傳輸狀況，而我們也測試了在路徑不同匹配下SNC-MPTCP的表現。最後，我們觀察到SNC-MPTCP的表現在傳輸中勝過單條的TCP、原始的MPTCP和一般的編瑪NC-MPTCP在DASH串流的傳輸上。;With the evolution of network technology, many people watch streaming videos by their mobile devices. As the increasing of video data trafﬁc, the network condition of mobile users become important. If mobile users watch a high resolution video under a worse network condition, it will impact their experience. To solve this problem, there are many streaming techniques to come out with a newly strategy for a better solution. Dynamic Adaptive Streaming over HTTP (DASH) is now a common streaming technique that provide a suitable segment bitrate for video users to watch their videos. But, it will still be an issue while the resolution remain lower which may inﬂuence the user’s experience. When a DASH client is watching a VR streaming service, the unstable network will cause the representation of video contents. Otherwise, to offer a higher network transmission, multipath TCP (MPTCP) becomes a method to provide video user’s a higher link capacity. As many devices support MPTCP and the higher link capacity can cover the video trafﬁc. But, many studies show that some of problems in MPTCP transmission should be concerned, such as scheduling, congestion control and path conditions. In this work, we aim to discuss when a DASH client watch their streaming under unstable MPTCP transmission and propose an SNC-MPTCP (Segment Network Coding over MPTCP) algorithm to overcome several network situations. In our method, we apply the network coding to protect loss packets and use the theoretical formulation to estimate decoding probability. Then, we also make an implementation in NS-3. The scenarios include general video and VR dataset under limited link capacity and cross trafﬁc situations. Finally, we observe that SNC-MPTCP can handle different condition and get higher performance compared with single TCP, naive MPTCP and NC-MPTCP in the DASH transmission.
Appears in Collections:	[Graduate Institute of Communication Engineering] Electronic Thesis & Dissertation

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