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

无线技术的进步使得互联网用户能够通过他们的移动的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，现有的互联网缺乏对向异构移动的设备的高效流传输的足够支持。 这是由于发送方和接收方的资源限制。在这个项目中，有效的和基本的计算技术正在开发和实施，以解决这些限制，从系统级到应用程序级。为了指导高效的转码算法的设计，一个新的系统模型正在被构建。 其目标是通过实时转码大大降低对CPU周期和存储大小的需求。通过这些新的转码算法，流传输系统的容量和吞吐量有望显著提高。此外，通过对移动终端在数据接收、解码和显示阶段的功耗的分析，正在开发用于有效管理移动的设备中的功耗的综合优化模型。该项目开发的节能机制有望大幅延长移动的设备的电池寿命。正在对代码转换友好和功率感知方案进行调整和评估，以支持移动的互联网接入。这些方案不仅将支持广泛的移动的接入互联网应用，而且还将进一步节省移动的设备的功率。本项目开发的技术有望消除阻碍互联网流传输到移动的设备的障碍，并使其更加有效和普及。

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.