Towards QoS Improvements of TCP-Based Media Delivery

M. Prangl, Ingo Kofler, H. Hellwagner
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引用次数: 22

Abstract

The amount of audiovisual data available on the Internet and thus of multimedia communication over today's networks is increasing at a rapid pace. Despite the availability of specific media transport protocols like RTP, most content providers make use of the well-established and reliable TCP protocol to deliver audiovisual content over the Internet. The reason is that TCP-based data delivery in general is much less complicated for the clients to be served and over today's networks traversed (including proxies and firewalls), than making use of UDP-based RTP connections. However, in case of network bandwidth fluctuations and packet losses, TCP-based media delivery may lead to annoying jerky playback at the client side, due to retransmissions and late arrival of media data. This papers deals with TCP-based perceptual QoS improvement mechanisms for increasing the media experience for the consumer under unstable network conditions. Our approach is based on media content adaptation (transcoding) to fit the actual network bandwidth continuously monitored by the sender. The proposed mechanisms are applied at the application level at the server side, leaving the existing TCP implementation untouched and therefore enabling transparent use of existing media players. An evaluation of a realistic use case is presented which underlines the efficacy of our approach.
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基于tcp的媒体传输QoS改进研究
互联网上可用的视听数据的数量,以及当今网络上的多媒体通信的数量正在迅速增加。尽管像RTP这样的特定媒体传输协议是可用的,但大多数内容提供者都使用公认可靠的TCP协议在Internet上传递视听内容。原因是,与使用基于udp的RTP连接相比,基于tcp的数据传递对于要服务的客户机和通过当今网络(包括代理和防火墙)的客户机来说通常要简单得多。但是,在网络带宽波动和丢包的情况下,基于tcp的媒体传输可能会导致客户端播放不稳定,这是由于媒体数据的重传和延迟到达造成的。本文研究了基于tcp的感知QoS改进机制,以提高消费者在不稳定网络条件下的媒体体验。我们的方法是基于媒体内容适应(转码),以适应由发送方持续监控的实际网络带宽。提议的机制在服务器端的应用程序级别上应用,不影响现有的TCP实现,因此可以透明地使用现有的媒体播放器。给出了一个实际用例的评估,它强调了我们方法的有效性。
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