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Fractional routing using pairs of failure-disjoint paths

机译:使用成对的故障-不相交路径进行部分路由

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摘要

Given a set of commodities and a network where some arcs can fail while others are reliable, we consider a routing problem with respect to a survivability requirement that each commodity can be split among pairs of failure-disjoint paths. Two paths p and p′ form a pair of failure-disjoint paths if they share only reliable arcs. The same flow is sent over p and p′, but the flow sent on a common reliable arc is not doubled. We present a compact linear formulation of the problem. Also three non-compact formulations solvable by column generation are introduced. In the first formulation, the generated columns correspond to pairs of failure-disjoint paths, while in the second formulation the generated columns correspond to simple paths. The third formulation is solved by generating pairs of arc-disjoint paths. All formulations are compared numerically. On top of that we study some generalizations and some special cases of the problem of computing a shortest pair of failure-disjoint paths. One of these generalizations is equivalent to a single-commodity capacitated network design problem.
机译:给定一套商品和一个网络,其中某些电弧可能会失效而另一些电弧则是可靠的,因此,我们考虑了关于生存能力要求的路由问题,即每个商品都可以在成对的故障不相交路径之间划分。如果两个路径p和p'仅共享可靠的弧,则它们将形成一对故障断开路径。在p和p'上发送相同的流,但是在公共可靠弧上发送的流不会加倍。我们提出问题的一个紧凑的线性表述。还介绍了三种可通过色谱柱产生的非紧凑型制剂。在第一个公式中,生成的列对应于失效-不相交路径对,而在第二个公式中,生成的列对应于简单路径。第三种公式是通过生成成对的弧形不相交路径来解决的。将所有配方进行数值比较。最重要的是,我们研究了计算一条最短的故障-不相交路径对的问题的一些概括和一些特殊情况。这些概括之一等效于单商品容量网络设计问题。

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