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

移动设备上的视频流最近经历了巨大的增长，是许多无线运营商的主要营销点。由于视频的数据量非常大，移动设备必须花费大量的电池电量通过无线网络下载和处理视频。现有的基于互联网的视频流的研究没有考虑到与能源效率相关的新的研究挑战以及移动设备和无线网络的特殊特性。为了在移动设备上支持能量感知和体验质量感知的视频流，本研究解决了在不同环境下如何、何时和多少数据下载以节省能量和改善用户体验质量的挑战：(A)了解处理器频率如何影响网络吞吐量和能量消耗，以及如何根据用户上下文调整频率以最小化能量或最大化体验质量；(B)考虑到用户在某些情况下跳过场景和放弃观看，开发用于缓冲区管理的协议；以及(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量消耗。随着移动设备上的视频流成为日常生活的一部分，这项研究通过提高视频流的质量并使移动设备使用更长时间，具有造福社会的巨大潜力。这项研究的结果可能会在支持移动设备上的能源感知和QOE感知视频流方面培育新的研究方向。该项目将吸引代表人数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。该项目产生的所有数据，包括跟踪数据、软件代码、模拟数据和出版物，都将在项目库公开提供：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使用适当的方法保存至少五年。该奖项反映了NSF的法定使命，并通过使用基金会的智力优势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.