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QoE of YouTube Video Streaming for Current Internet Transport Protocols

机译:当前Internet传输协议的YouTube视频流的QoE

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Video streaming currently dominates global Internet traffic and will be of even increasing importance in the future. In this paper we assess the impact of the underlying transport protocol on the user perceived quality for video streaming using YouTube as example. In particular, we investigate whether UDP or TCP fits better for Video-on-Demand delivery from the end user's perspective, when the video is transmitted over a bottleneck link. For UDP based streaming, the bottleneck link results in spatial and temporal video artifacts, decreasing the video quality. In contrast, in the case of TCP based streaming, the displayed content itself is not disturbed but playback suffers from stalling due to rebuffering. The results of subjective user studies for both scenarios are analyzed in order to assess the transport protocol influences on Quality of Experience of YouTube. To this end, application-level measurements are conducted for YouTube streaming over a network bottleneck in order to develop models for realistic stalling patterns. Furthermore, mapping functions are derived that accurately describe the relationship between network-level impairments and QoE for both protocols.
机译:视频流目前在全球互联网流量中占主导地位,并且在未来将变得越来越重要。在本文中,我们以YouTube为例,评估了基本传输协议对用户感知的视频流质量的影响。特别是,当视频通过瓶颈链路传输时,我们从最终用户的角度研究了UDP或TCP是否更适合视频点播。对于基于UDP的流传输,瓶颈链接会导致空间和时间视频失真,从而降低视频质量。相反,在基于TCP的流传输的情况下,显示的内容本身不会受到干扰,但是由于重新缓冲,播放会停顿下来。分析了两种情况下的主观用户研究结果,以评估传输协议对YouTube体验质量的影响。为此,将针对网络瓶颈上的YouTube流进行应用程序级别的测量,以便为实际的停顿模式开发模型。此外,推导了映射功能,可以准确描述两种协议的网络级损害和QoE之间的关系。

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