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首页> 外文会议>Broadband Multimedia Systems and Broadcasting, 2009. BMSB '09 >Improving IPTV services by H.264/SVC adaptation and traffic control
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Improving IPTV services by H.264/SVC adaptation and traffic control

机译：通过H.264 / SVC自适应和流量控制来改善IPTV服务

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摘要

This paper presents a novel approach that combines both in-network, application-layer adaptation and network-layer traffic control of scalable video streams based on the H.264/SVC standard. In the IPTV/VoD scenario considered, an intercepting RTSP/RTP proxy performs admission control of the requested video, based on the signaled scalability information, and decides whether the content can be streamed without changes or in an adapted version. The proxy configures the network layer appropriately in order to separate the video stream from best-effort traffic on the same link. Rather than performing fixed bandwidth allocation, our proxy approach uses the hierarchical token bucket (HTB) queuing discipline to allow for borrowing bandwidth between traffic classes. In that setting, two different allocation policies are introduced. The hard reservation policy (HRP) performs admission control and adaptation on the video streams and does not modify video bandwidth allocation after admission. In contrast, the flexible borrowing policy (FBP) restricts the admission control to the base layer of the SVC stream. The packets carrying MGS enhancement layer data are marked with priorities by the proxy and are handled at the network layer by a priority-based queuing mechanism. Both a qualitative comparison and an experimental evaluation of the two policies are given.
机译：本文提出了一种新颖的方法，该方法结合了基于H.264 / SVC标准的可伸缩视频流的网络内，应用程序层自适应和网络层流量控制。在考虑的IPTV / VoD场景中，截取的RTSP / RTP代理根据发出的可伸缩性信息对请求的视频执行准入控制，并确定是否可以流式传输内容而无需进行更改或采用适合的版本。代理适当地配置网络层，以便将视频流与同一链路上的尽力而为流量分开。我们的代理方法不是执行固定的带宽分配，而是使用分层令牌桶（HTB）排队规则来允许流量类之间的借用带宽。在这种情况下，引入了两种不同的分配策略。硬保留策略（HRP）对视频流执行准入控制和适配，并且在准入后不修改视频带宽分配。相反，灵活借用策略（FBP）将准入控制限制为SVC流的基础层。带有MGS增强层数据的数据包由代理标记优先级，并通过基于优先级的排队机制在网络层进行处理。给出了两种政策的定性比较和实验评估。

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