Collaborative Research: CSR-EHS: System Research on Media Streaming to Heterogeneous Mobile Devices

无线技术的进步使互联网用户能够通过他们的移动设备访问各种互联网服务。然而，随着互联网流媒体内容的急剧增加，现有的互联网缺乏足够的支持来高效地向异类移动设备进行流媒体传输。这是由于发送方和接收方的资源限制。在这个项目中，正在开发和实施有效的基础计算技术来解决这些限制，从系统级到应用程序级。为了指导高效转码算法的设计，正在构建一种新的流媒体资源系统模型。其目标是通过实时转码大幅降低对CPU周期和存储大小的需求。有了这些新的转码算法，流媒体传输系统的容量和吞吐量有望显著提高。此外，通过对移动设备在数据接收、解码和显示阶段的功耗分析，建立了一个全面的优化模型，以有效地管理移动设备的功耗。该项目开发的节电机制预计将大幅延长移动设备的电池寿命。代码转换友好和功率感知方案正在进行量身定制和评估，以支持移动互联网接入。这些方案不仅将支持广泛的移动接入互联网应用程序，还将进一步节省移动设备的电力。该项目将开发的技术预计将消除阻碍互联网流到移动设备的障碍，并使其显著提高效率和普及率。

The advancement of wireless technology has enabled Internet users to access all kinds of Internet services via their mobile devices. However, with the dramatic increase of Internet streaming media content, the existing Internet lacks sufficient support for efficient streaming delivery to heterogeneous mobile devices. This is due to the resource constraints at both the sender side and the receiver side.In this project, effective and fundamental computing techniques are being developed and implemented to address these limits, spanning from the system level to the application level. A new system model is being constructed for streaming media sources in order to guide the design of efficient transcoding algorithms. The objective is to greatly reduce demand for CPU cycles and storage size through real-time transcoding. With these new transcoding algorithms, the capacity and throughput of the streaming delivery system are expected to significantly improve. Furthermore, through the analysis of the power consumption for a mobile device at the data receiving, decoding, and displaying stages, a comprehensive optimization model is being developed for efficient management of power consumption in mobile devices. Power-saving mechanisms developed in the project are expected to substantially prolong battery lifetime for mobile devices. Transcoding-friendly and power-aware schemes are being tailored and evaluated to support mobile Internet access. These schemes will not only support widespread mobile access to Internet applications, but also further conserve power at mobile devices.The techniques to be developed in this project are expected to remove barriers that inhibit Internet streaming to mobile devices and make it significantly more efficient and pervasive.