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Dynamic Reconfiguration of Logical Topology for WDM Networks under Traffic Changes

机译：流量变化下WDM网络逻辑拓扑动态重新配置

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摘要

In this paper, we present a new approach to solve the logical topology reconfiguration problem for IP over WDM networks under dynamic traffic. Based on the measurement of lightpaths' load, a change in the logical topology is made if some lightpath is highly loaded or under utilized. The change can be adding/deleting several lightpaths or just rerouting traffic in the current logical topology. The key idea of our approach is to determine a new logical topology so that the maximum lightpaths' load at the time of reconfiguration is limited by a load-balance indicator, which is pre-defined as a system's parameter. It ensures the network performance (in terms of lightpath utilization) and also increases the lifetime of the logical topology under dynamic traffic changes. Moreover, our approach ensures no network disruption during the reconfiguration process while allowing adding or deleting multiple lightpaths at the same time. The algorithm is formulated as a mixed integer linear programming (MILP). The performance is investigated and compared with Gencata's approach through an illustrative numerical example. Because the proposed MILP is complex and can be applied only to small networks, an approximate model is also presented to solve the problem for some real-size networks.
机译：在本文中，我们提出了一种新的方法来解决动态流量下的WDM网络的IP逻辑拓扑重新配置问题。基于LightPaths负载的测量，如果有一些LightPath高负荷或使用，则制作逻辑拓扑的变化。更改可以添加/删除多个光路或仅在当前逻辑拓扑中的流量。我们方法的关键思想是确定一个新的逻辑拓扑，使得重新配置时的最大光路负载受到负载平衡指示器的限制，该指示器被预定为系统的参数。它确保了网络性能（在LightPath利用率方面），并且还在动态流量变化下增加了逻辑拓扑的寿命。此外，我们的方法在重新配置过程中不确保网络中断，同时允许同时添加或删除多个光路。该算法作为混合整数线性编程（MILP）配制。通过说明性的数值示例研究了性能并与Gencata的方法进行了比较。因为提议的MILP是复杂的并且只能应用于小型网络，所以还提出了一个近似模型来解决一些真实尺寸网络的问题。

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