Popularity and adjacency based prefetching for efficient IPTV channel navigation
Popularity and adjacency based prefetching for efficient IPTV channel navigation
复制标题
基于流行度和邻接性的预取，实现高效的 IPTV 频道导航
DOI：
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发表时间：
2011
影响因子：
4.3
通讯作者：
Ik
中科院分区：
文献类型：
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作者：
Soyoon Lee;H. Moon;H. Bahn;Taeseok Kim;Ik
随着互联网协议电视 (IPTV) 的日益普及，用户可以欣赏数百个 IPTV 频道的各种内容。然而，频道数量的增加使得用户更难找到他们想要的内容。除了这个问题之外，IPTV 的频道切换时间也会导致严重的用户感知延迟。为了缓解这些问题，本文提出了一种可以在IPTV机顶盒上实现的新频道预取方案。该方案基本上在实际请求之前获取相邻通道的内容，类似于基于邻接的预取方案。然而，它根据频道的受欢迎程度来区分上行和下行频道中要预取的频道数量。各种实验条件下的跟踪驱动仿真表明，在找到所需通道的预取命中率方面，所提出的预取方案比现有的预取方案表现更好。具体来说，当IPTV频道数量为150时，与基于邻接的预取方案相比，命中率平均提高了22.3%。
As Internet Protocol Television (IPTV) is becoming increasingly popular, users can enjoy a variety of contents from hundreds of IPTV channels. However, the increased number of channels makes users even more difficult to find their desired contents. Along with this problem, the channel zapping time of IPTV incurs serious user-perceived latency. To alleviate these problems, this paper presents a new channel prefetching scheme that can be implemented on the IPTV set-top box. The scheme basically fetches the contents of adjacent channels before they are actually requested, similar to the adjacency-based prefetching scheme. However, it differentiates the number of channels to be prefetched among up-direction and down-direction channels based on the popularity of channels. Trace-driven simulations with various experimental conditions show that the proposed prefetching scheme performs better than existing prefetching schemes in terms of the prefetching hit rate to find the desired channel. Specifically, when the number of IPTV channels is 150, the average improvement of the hit rate is 22.3% compared to the adjacency-based prefetching scheme.