vSkyConf: cloud-assisted multi-party mobile video conferencing
vSkyConf: cloud-assisted multi-party mobile video conferencing
复制标题
DOI：
10.1145/2491266.2491273
复制
发表时间：
2013-03
期刊：
影响因子：
--
通讯作者：
Yuehua Wu;Chuan Wu;Bo Li;F. Lau
中科院分区：
文献类型：
--
作者：
Yuehua Wu;Chuan Wu;Bo Li;F. Lau
作为当今繁忙世界的重要应用，移动视频会议促进人们通过移动设备与朋友、家人和同事进行虚拟的面对面交流。然而，如何通过移动设备提供高质量的多方视频会议体验仍然是一个开放的挑战。其背后的根本原因是移动设备缺乏计算和通信能力，无法扩展到大型会议会话。在本文中，我们提出了vSkyConf，一种云辅助移动视频会议系统，旨在从根本上提高多方移动视频会议的质量和规模。通过在云中为每个移动用户新颖地使用代理虚拟机，我们允许会议参与者通过他们的代理而不是直接进行完全可扩展的通信。代理者相互交换会议流，将流转码为最合适的比特率，并对流进行缓冲，以便最有效地传送给移动接收者。完全分散的算法旨在决定流的最佳路径以及沿路径进行视频转码的最合适的代理，从而充分利用有限的带宽向移动接收者传送尽可能高质量的流。我们还在每个代理上精心定制了缓冲机制，以配合高效的流分发。我们基于 Amazon EC2 实现了 vSkyConf，并与广泛采用的单播解决方案相比，验证了我们设计的卓越性能。
As an important application in today's busy world, mobile video conferencing facilitates people's virtual face-to-face communication with friends, families and colleagues, via their mobile devices on the move. However, how to provision high-quality, multi-party video conferencing experiences over mobile devices is still an open challenge. The fundamental reason behind is the lack of computation and communication capacities on the mobile devices, to scale to large conferencing sessions. In this paper, we present vSkyConf, a cloud-assisted mobile video conferencing system to fundamentally improve the quality and scale of multi-party mobile video conferencing. By novelly employing a surrogate virtual machine in the cloud for each mobile user, we allow fully scalable communication among the conference participants via their surrogates, rather than directly. The surrogates exchange conferencing streams among each other, transcode the streams to the most appropriate bit rates, and buffer the streams for the most efficient delivery to the mobile recipients. A fully decentralized algorithm is designed to decide the best paths of streams and the most suitable surrogates for video transcoding along the paths, such that the limited bandwidth is fully utilized to deliver streams of the highest possible quality to the mobile recipients. We also carefully tailor a buffering mechanism on each surrogate to cooperate with efficient stream distribution. We have implemented vSkyConf based on Amazon EC2 and verified the excellent performance of our design, as compared to the widely adopted unicast solutions.