A Survey and Perspective on NVoD Systems for Satellite Networks
A Survey and Perspective on NVoD Systems for Satellite Networks
复制标题
卫星网络 NVoD 系统的调查与展望
DOI：
10.1109/iwssc.2007.4409422
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发表时间：
2007
期刊：
影响因子：
--
通讯作者：
H. Bischl
中科院分区：
文献类型：
--
作者：
R. Asorey;N. Courville;F. González;H. Bischl
本文综述了卫星网络近视频点播（NVoD）系统的不同架构。在许多情况下，卫星是内容分发的唯一可用选择。另一方面，视频点播（VoD）在过去一直是一个研究热点。VoD系统的主要问题是其带宽需求不能很好地随用户请求扩展。因此，视频点播只有在一定的约束条件下才具有可行性。一般来说，NVoD系统是VoD系统的近似值。在它们中，下载不一定在请求到达时开始，而是在一段时间后开始。通过这样做，可以限制所需的总带宽，但代价是在内容下载中引入一些延迟。
In this paper, we review different architectures for near video-on-demand (NVoD) systems on satellite networks. In many scenarios, satellites are the only available option for content distribution. On the other hand, video-on-demand (VoD) has been a topic of intense research in the past. The main problem of VoD systems is that their bandwidth requirements do not scale well with user requests. For this reason, VoD is only feasible under some constraints. In general, NVoD systems are an approximation of VoD ones. In them, downloads do not necessarily start when the request arrives, but some time later. By doing so, it is possible to bound the total required bandwidth at the cost of introducing some delay in content download.