Global versus essential post-disaster re-provisioning in telecom mesh networks


Telecommunication networks face large-scale threats, like natural disasters (earthquake, hurricane, tsunami, etc.) and targeted attacks (weapons of mass destruction). These disasters might simultaneously destroy several network components (nodes and/or links) and cause multi-failure events. Although existing protection schemes will handle some given multi-failure situations, it is extremely challenging to resolve all doable disaster-failure eventualities with cheap resource prices and a a hundredp.c reliability guarantee. In this paper, we tend to investigate postdisaster restoration methods for telecom backbone mesh networks (such as wavelength-division multiplexed networks), whose objective is 2-fold: to maintain network connectivity (i.e., guarantee a minimal degree of service for the survived connections) and to maximize the traffic flow within the post-disaster network. We tend to study 3 postdisaster re-provisioning schemes using totally different policies for association rerouting and admissible bandwidth degradation (i.e., provisioning partial bandwidth). These schemes, whose services vary from essential to global post-disaster re-provisioning, are the no-degradation reprovisioning (NDR) theme, the degradation-as-needed re-provisioning (DAN) theme, and also the fairness-aware degradation re-provisioning (FAD) scheme. Corresponding mixed integer linear program models are developed and applied on two representative mesh topologies. Numerical results show that NDR will effectively decrease the affiliation loss ratio by rerouting some survived connections. But, both DAN and FAD will achieve optimal performance on maintaining connectivity even without rerouting any survived connections. DAN outperforms the opposite schemes in terms of traffic loss ratio, but it may cause a massive difference between the most and minimum degradation ratios. FAD can improve the performance in terms of traffic loss ratio by rerouting some survived connections. In particular, compared with DAN, FAD will provide b- lanced bandwidth degradation for all connections by sacrificing a bound quantity of traffic flow, but avoiding extreme deterioration of the bandwidth capability on some connections.

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