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中文摘要：
为降低保护切换代价和提高故障恢复时间，提出了以光纤级P-Cycle来实现网络保护；研究了工作路由与光纤级P-Cycle放置联合优化的设计问题，给出了ILP数学模型。为降低计算的复杂度，采用了一种简单有效的方法：根据跳数预先选择工作路由候选集及环的有效性和长度预先选择P-Cycle候选集。仿真结果表明光纤级P-Cycle设计相比于波长级P-Cycle设计保护切换代价大大降低。
英文摘要：
To reduce the protection-switching cost and failure recovery time, the fiber-level P-Cycles is presented to realize network protection. The issue about the joint optimization design of the working path routes with fiber-level P-Cycle placement is further studied; and an improved ILP formulation is developed. To reduce the complexity of joint optimization problem, the simple process of pre-selecting candidate P-Cycles by the efficiency and length metric and candidate working path routes by the hop metric is used. By simulation analysis, the fiber-level P-Cycles scheme efficiently decreases the switching cost compared with the wavelength-level P-Cycles.
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