Towards More Dynamic Energy-Efficient Bandwidth Allocation in EPONs
Towards More Dynamic Energy-Efficient Bandwidth Allocation in EPONs
复制标题
实现 EPON 中更加动态、节能的带宽分配
DOI：
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发表时间：
2018
期刊：
影响因子：
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通讯作者：
A. Nayak
中科院分区：
文献类型：
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作者：
A. Helmy;A. Nayak
自循环睡眠模式首次被提出用于光网络单元（onu）以来，无源光网络（pon）的节能一直是一个活跃的研究领域。许多研究都将每个ONU的下游和上游传输锁定在一个循环的固定插槽中，从而允许ONU在剩余的传输周期中切换到睡眠模式。但是，这种固定分配限制了带宽分配的灵活性和动态性，导致上游利用率不足。此外，为了最大限度地节省电力，所使用的周期持续时间必须足够长，以弥补模式切换开销，这在数据包延迟方面会显著降低网络性能。在本文中，我们开发了一种新的以太网pon （epon）节能框架。为此，我们提出了不同的上游分配方案，以提高固定时隙的性能，同时将能源效率维持在可接受的水平。我们还提出了一种更精确的上下游锁定安排。此外，我们使用了长距离PON设置，其中长传播延迟影响网络性能，对带宽分配提出了进一步的挑战。数值结果表明，在高负载的网络条件下，数据包延迟可以减少60%左右，而额外的功耗成本低于5%。
Power conservation in passive optical networks (PONs) has been an active area of research since the cyclic sleep-mode was first proposed for optical network units (ONUs). Many studies have then settled upon locking downstream and upstream transmissions for each ONU in a cyclic fixed slot, thus allowing the ONU to switch to sleep-mode for the rest of the transmission cycle. However, such fixed allocation limits the flexibility and dynamicity of the bandwidth allocation and leads to upstream underutilization. Moreover, to maximize power conservation, the cycle duration used must be long enough to make up for mode-switching overheads, which significantly degrades the network performance in terms of packet delays. In this paper, we develop a novel energy-efficient framework for Ethernet PONs (EPONs). To that end, we propose different upstream allocation schemes to improve the fixed-slot performance while maintaining energy-efficiency at acceptable levels. We also propose a more accurate arrangement for downstream-upstream locking. Moreover, we use a long-reach PON setting, where the long propagation delays impact the network performance posing further challenges to the bandwidth allocation. Numerical results show that, under heavily loaded network conditions, packet delays can be reduced by around 60% at an additional power cost of less than 5%.