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首页> 外文期刊>Emerging and Selected Topics in Circuits and Systems, IEEE Journal on >Content-Priority-Aware Chunk Scheduling Over Swarm-Based P2P Live Streaming System: From Theoretical Analysis to Practical Design
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Content-Priority-Aware Chunk Scheduling Over Swarm-Based P2P Live Streaming System: From Theoretical Analysis to Practical Design

机译：基于群体的P2P实时流媒体系统中的内容优先级块调度：从理论分析到实际设计

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摘要

In this work, we revisit two chunk, which is the smallest video data unit for scheduling and transmission, scheduling policies that are essentially mutually exclusive but beneficial for swarm-based P2P live streaming systems. The first is content-diversified oriented (cd-oriented) policy, which regards each chunk of equal importance and schedules chunks to be sent in a near-random fashion. With this approach, peers hold different parts of stream content and contribute their available bandwidth to the system. The second is importance-first oriented (if-oriented) policy, which gives each chunk a content-dependent priority, usually in a rate-distortion (RD) sense, and first schedules the highest-priority chunk to be sent. In doing so, important chunks are more likely to be successfully received before their playback; the reconstructed video quality is thus enhanced under poor network conditions. We successfully identify a simple methodology, which operates on the data availability domain, to leverage both policies. (Data availability here means the set of data units that the user can get from its source(s)). This allows us to deploy dynamic strategy switch scheduling in practical systems to further improve the received video quality of each peer. Simulation results show that our data-availability driven dynamic strategy switch not only overcomes the drawbacks of the two individual policies but also retains the benefits of both. Most importantly, it bridges the gap between rate-distortion analysis on compressed video and P2P content delivery research.
机译：在这项工作中，我们将回顾两个块，这是用于调度和传输的最小视频数据单元，调度策略本质上是互斥的，但对于基于群体的P2P实时流传输系统是有益的。第一个是面向内容多样化（面向CD）的策略，该策略对待每个具有相同重要性的块，并以接近随机的方式调度要发送的块。使用此方法，对等方持有流内容的不同部分，并将其可用带宽分配给系统。第二个是面向重要性优先（如果面向）的策略，该策略通常在速率失真（RD）的意义上为每个块赋予依赖于内容的优先级，然后首先调度要发送的最高优先级块。这样一来，重要的块在回放之前就更有可能被成功接收；因此，在恶劣的网络条件下，重建的视频质量将得到提高。我们成功地确定了一种在数据可用性域上运行的简单方法，可以利用这两种策略。 （此处的数据可用性是指用户可以从其来源获得的数据单元集）。这使我们能够在实际系统中部署动态策略切换调度，以进一步提高每个对等方的接收视频质量。仿真结果表明，我们的数据可用性驱动的动态策略交换机不仅克服了两个单独策略的缺点，而且保留了两者的优点。最重要的是，它弥合了压缩视频的速率失真分析与P2P内容交付研究之间的鸿沟。

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