Abstract
This paper focuses on how to increase the availability of a backbone network with minimal cost. In particular, the new framework focuses on resilience against natural disasters and is an evolution of the FRADIR/FRADIR-II framework. It targets three different directions, namely: network planning, failure modeling, and survivable routing. The steady state network planning is tackled by upgrading a sub-network (a set of links termed the spine) to achieve the targeted availability threshold. A new two-stage approach is proposed: a heuristic algorithm combined with a mixed-integer linear problem to optimize the availability upgrade cost. To tackle the disaster-resilient network planning problem, a new integer linear program is presented for the optimal link intensity tolerance upgrades together with an efficient heuristic scheme to reduce the running time. Failure modeling is improved by considering more realistic disasters. In particular, we focus on earthquakes using the historical data of the epicenters and the moment magnitudes. The joint failure probabilities of the multi-link failures are estimated, and the set of shared risk link groups is defined. The survivable routing aims to improve the network’s connectivity during these shared risk link group failures. Here, a generalized dedicated protection algorithm is used to protect against all the listed failures. Finally, the experimental results demonstrate the benefits of the refined eFRADIR framework in the event of disasters by guaranteeing low disconnection probabilities even during large-scale natural disasters.
Highlights
The changed user behaviour during the current pandemic highlighted the utmost importance of reliable communication networks and services, which support the increased traffic generated by, e.g., online teaching and home office
The availability and reliability of the communication infrastructure are usually quantified as Quality of Resilience (QoR) [1]–[3], which is expected to be very high for mission-critical services like telesurgery or stock market
STEADY STATE NETWORK PLANNING PHASE we introduce our network model and our spine design used by eFRADIR for resilient network planning against independent failures
Summary
The changed user behaviour during the current pandemic highlighted the utmost importance of reliable communication networks and services, which support the increased traffic generated by, e.g., online teaching and home office. The availability and reliability of the communication infrastructure are usually quantified as Quality of Resilience (QoR) [1]–[3], which is expected to be very high for mission-critical services like telesurgery or stock market (even including additional latency constraints). These properties are determined by the underlying network infrastructure, and by the proper. Pašić et al.: eFRADIR: An Enhanced FRAmework for DIsaster Resilience usage of resources and engineering, as well as the scientific knowledge to deploy communication paths for such services in a reliable manner
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