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Efficient algorithms for wavelength assignment on trees of rings

机译:在环树上进行波长分配的高效算法

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A fundamental problem in communication networks is wavelength assignment (WA):given a set of routing paths on a network, assign a wavelength to each path such that the paths with the same wavelength are edge-disjoint, using the minimum number of wavelengths. The WA problem is NP-hard for a tree of rings network which is well used in practice. In this paper, we give an efficient algorithm which solves the WA problem on a tree of rings with an arbitrary (node) degree using at most 3L wavelengths and achieves an approximation ratio of 2.75 asymptotically, where L is the maximum number of paths on any link in the network. The 3L u pper bound is tight since there are instances of the WA problem that require 3L wavelengths even on a tree of rings with degree four. We also give a 3L and 2-approximation (resp. 2.5-approximation) algorithm for the WA problem on a tree of rings with degree at most six (resp. eight). Previous results include: 4L (resp. 3L) wavelengths for trees of rings with arbitrary degrees (resp. degree at most eight), and 2-approximation (resp. 2.5-approximation) algorithm for trees of rings with degree four (resp. six).
机译:通信网络中的一个基本问题是波长分配(WA):给定网络上的一组路由路径,将波长分配给每个路径,以便使用最小波长数将具有相同波长的路径边缘分离。对于树状环网络,WA问题是NP难题,在实践中使用得很好。在本文中,我们给出了一种有效的算法,该算法使用最多3L波长来解决具有任意(节点)度的环树上的WA问题,并且渐近地达到2.75的近似比,其中L是任何路径上的最大路径数网络中的链接。由于存在WA问题的实例,即使在四度的圆环树上,也需要3L的波长,因此3L的限制非常严格。我们还针对度数最大为6(分别为8)的圆环树上的WA问题,给出了3L和2近似(分别为2.5)的算法。先前的结果包括:具有任意度数(最多8度)的圆环树的4L(分别为3L)波长,以及具有度数4(最大6)的圆环树的2近似(大约2.5近似值)算法。 )。

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