A QoS adaptive transport system: design, implementation and experience
A QoS adaptive transport system: design, implementation and experience
复制标题
QoS自适应传输系统：设计、实现和经验
DOI：
10.1145/244130.244174
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发表时间：
1997
期刊：
影响因子：
--
通讯作者：
G. Coulson
中科院分区：
文献类型：
--
作者：
A. Campbell;G. Coulson
分布式音频和视频应用需要适应交付服务质量(Qos)的波动。通过在时间和空间质量与可用带宽之间进行权衡，或者控制连续媒体的播放时间以响应延迟的变化，可以使音频和视频流以最小的感知失真来适应波动的服务质量。在本文中，我们描述了一个服务质量自适应传输系统的实现，它结合了面向服务质量的API和一系列机制来帮助应用程序利用服务质量和适应服务质量的波动。该系统是对服务质量体系结构(QOS-A)的实例化，是在基于Linux的PC端系统和连续媒体文件服务器的多ATM交换网络环境中实现的。给出了支持视频点播应用场景的系统性能评估，并进行了讨论。
Distributed audio and video applications need to adapt to fluctuations in delivered quality of service (QoS). By trading off temporal and spatial quality to available bandwidth, or manipulating the playout time of continuous media in response to variation in delay, audio and video flows can be made to adapt to fluctuating QoS with minimal perceptual distortion. In this paper we describe the implementation of a QoS adaptive transport system that incorporates a QoS oriented API and a range of mechanisms to assist applications in exploiting QoS and adapting to fluctuations in QoS. The system, which is an instantiation of the QoS Architecture (QoS-A), is implemented in a multi ATM switch network environment with Linux based PC end systems and continuous media file servers. A performance evaluation of the system configured to support Video-on-Demand application scenario is presented and discussed.