CSR: Small: Energy-Aware and QoE-Aware Video Streaming on Mobile Devices

移动设备上的视频流媒体最近出现了巨大的增长，是许多无线运营商的主要营销点。由于视频具有非常大的数据量，移动设备必须花费大量的电池电量来通过无线网络下载和处理视频。现有的互联网视频流研究没有考虑到与能源效率和移动设备和无线网络的特殊特性相关的新研究挑战。该项目通过开发新技术来解决这些挑战，在保持视频流用户体验质量（QoE）的同时节省能源。为了支持移动设备上的能量感知和QoE感知视频流，本研究解决了在不同环境下如何、何时以及下载多少数据以节省能源和提高用户的QoE的挑战，通过以下几个重点：(a)了解处理器频率如何影响网络吞吐量和能耗，以及如何根据用户环境调整频率以最小化能量或最大化QoE；(b)考虑到用户在某些情况下跳过场景和中止观看，制定缓冲区管理协议；(c)通过网络质量感知下载和上下文感知下载来降低视频流的能耗。随着移动设备上的视频流成为日常生活的一部分，本研究具有很大的潜力，可以通过提高视频流的质量，使移动设备的使用寿命更长，从而造福社会。这项研究的结果可能会在支持移动设备上的能量感知和qoe感知视频流方面培育新的研究方向。该项目将让代表性不足的学生参与研究。该项目的学术发现将通过出版物、开源软件和夏令营广泛传播。作为这个项目的结果产生的所有数据，包括跟踪数据、软件代码、模拟数据和出版物，将在项目存储库中公开提供：http://www.cse.psu.edu/~gcao/nsf/mobilevideo。数据和由此产生的研究成果将在项目结束后用适当的方法保存至少五年。该奖项反映了美国国家科学基金会的法定使命，并通过使用基金会的知识价值和更广泛的影响审查标准进行评估，被认为值得支持。

Video streaming on mobile devices has seen tremendous growth recently, and is a major marketing point of many wireless carriers. Because videos have very large data sizes, the mobile devices must spend a great deal of their battery power on downloading and processing the video over the wireless network. Existing research on video streaming over the Internet does not consider the new research challenges related to energy efficiency and the special characteristics of mobile devices and wireless networks. This project addresses these challenges by developing novel techniques to save energy while maintaining users' Quality of Experience (QoE) during video streaming.To support energy-aware and QoE-aware video streaming on mobile devices, this research addresses the challenges of how, when and how much data to download under different contexts to save energy and improve users' QoE through the following thrusts: (a) understanding how the processor frequency affects network throughput and energy consumption, and how to adjust the frequency to minimize energy or maximize QoE considering user context; (b) development of protocols for buffer management considering that users skip scenes and abort watching under some circumstances; and (c) reducing the energy consumption of video streaming through network quality aware downloading and context-aware downloading. As video streaming on mobile devices becomes part of everyday life, this research has great potential to benefit society by improving the quality of video streaming and making mobile devices last longer. The results from this research are likely to foster new research directions on supporting energy aware and QoE-aware video streaming on mobile devices. The project will engage under-represented students in research. The scholarly discovery of this project will be disseminated broadly through publications, open-source software, and summer camps.All data produced as a result of this project, including trace data, software code, simulation data, and publications, will be made publicly available at the project repository: http://www.cse.psu.edu/~gcao/nsf/mobilevideo. The data and the resulting research outputs will be maintained using appropriate methods for at least five years after the end of the project.This award reflects NSF's statutory mission and has been deemed worthy of support through evaluation using the Foundation's intellectual merit and broader impacts review criteria.