Minimizing the Worst-Case Playback Delay in VoD Services over Passive Optical Networks
Minimizing the Worst-Case Playback Delay in VoD Services over Passive Optical Networks
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DOI：
10.1109/infcom.2010.5462031
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发表时间：
2010-03
期刊：
影响因子：
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通讯作者：
Jianping Wang;C. Qiao;Yan Li;K. Lu
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文献类型：
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作者：
Jianping Wang;C. Qiao;Yan Li;K. Lu
最大限度地减少VOD服务中的最坏情况播放延迟(WPD)既是关键的，也是具有挑战性的。给定用于广播和打补丁的固定带宽，没有关于确定最小WPD的先前工作，更不用说保证它了。在这项工作中，我们提出了新的方案，通过在基于TDM的无源光网络(PON)的光网络单元(ONU)上执行重播和打补丁来利用其独特的特性。对于给定带宽的无源光网络中的视频点播业务，我们推导出了最小最坏情况下的播放时延，并设计了最优补丁调度算法以及ONU重播和补丁信道分配来保证最小的最坏情况下的播放时延。数值结果证实了所提方案在最坏情况和平均性能方面均优于已有方案。
Minimizing the worst-case playback delay (WPD) in VoD services is both critical and challenging. Given a fixed amount of bandwidth for broadcasting and patching, there is no prior work on determining the minimum WPD, let alone guaranteeing it. In this work, we propose novel schemes that leverage the unique properties of a TDM-based Passive Optical Network (PON) by performing rebroadcasting and patching at its Optical Network Unit (ONUs). For a given bandwidth available for VoD services in the PON, we derive the minimum worst-case playback delay (WPD), and also design optimal patch scheduling algorithm as well as ONU rebroadcast and patching channel assignment to guarantee such minimum WPD. Numerical results confirm the superiority of the proposed schemes over the existing ones in terms of both worst-case and average performance.