Reliability threshold based service bandwidth recovery scheme for post-disaster telecom networks

As natural disasters (e.g., earthquake, tsunami, hurricane, etc.) frequently threaten and damage the widely-deployed telecom infrastructure, maintaining the connectivity, transmission bandwidth, and reliability of various service connections becomes a crucial concern in post-disaster telecom networks (such as optical backbone networks). Based on a probabilistic failure model, in this paper we proposed a reliability threshold based service bandwidth recovery (RBR) scheme for recovering the bandwidth and reliability of the impacted service connections after a disaster. Here, the impacted service connections include the ones completely disrupted and/or the ones undisrupted but their reliability decreased beyond the corresponding reference thresholds. Since there is severe lack of bandwidth resource in the post-disaster network, some connections are difficult to obtain enough bandwidth. Under the resource crunch case, RBR employs relaxation policies based on reliability thresholds to explore reliable routes for the impacted connections and to optimize their bandwidth resource utilization. Simulation results show that RBR scheme can make a good trade-off between the bandwidth resource utilization and service connection reliability. It can also achieve satisfactory performance in terms of connection loss ratio, traffic loss ratio, and average connection reliability.