平移WDM网络中生存再生器配置的精确方法
Exact Approach for Survivable Regenerator Placement in Translucent WDM Networks
摘要：
大多数研究解决半透明网络设计的目标是最小化部署再生器的数量和最小化再生站点的数量之间的权衡。后者在很大程度上取决于运营商的战略，并受到各种考虑因素的推动，如功耗，维护和监督成本。然而，将再生器集中到少量节点中会使网络在再生器池故障的最终情况下面临数据丢失的高风险。在本文中，我们解决的问题，生存的半透明网络设计考虑到同时影响的四个传输损伤。我们提出了一个精确的方法，基于一个数学公式来解决问题的再生器的位置，同时确保网络的生存能力，在危险的事件中的再生器池故障。为此目的，对于每个接受的需要再生的请求，网络管理平面预先计算经过不同再生站点的若干路由路径以及相关联的有效波长。在这样做时，我们的目标是实现M：N共享再生池保护方案。仿真结果突出了在不牺牲网络生存性的情况下，通过减少再生站点的数量所获得的收益。
英文摘要：
Most studies addressing translucent network design targeted a trade-off between minimizing the number of deployed regenerators and minimizing the number of regeneration sites. The latter highly depends on the carrier's strategy and is motivated by various considerations such as power consumption, maintenance and supervision costs. However, concentrating regenerators into a small number of nodes exposes the network to a high risk of data losses in the eventual case of regenerator pool failure. In this paper, we address the problem of survivable translucent network design taking into account the simultaneous effect of four transmission impairments. We propose an exact approach based on a mathematical formulation to solve the problem of regenerator placement while ensuring the network survivability in the hazardous event of a regenerator pool failure. For this purpose, for each accepted request requiring regeneration, the network management plane computes in advance several routing paths along with associated valid wavelengths going through different regeneration sites. In doing so, we target to implement an M : N shared regenerator pool protection scheme. Simulation results highlight the gain obtained by reducing the number of regeneration sites without sacrificing network survivability.
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