IEEE/ACM Transactions on Networking (TON)
Efficient algorithms for routing dependable connections in WDM optical networks
IEEE/ACM Transactions on Networking (TON)
Static versus dynamic establishment of protection paths in WDM networks
Journal of High Speed Networks - Special issue on survivable optical networks - part II
Loopback recovery from double-link failures in optical mesh networks
IEEE/ACM Transactions on Networking (TON)
Lightpath re-optimization in mesh optical networks
IEEE/ACM Transactions on Networking (TON)
Optical WDM Networks (Optical Networks)
Optical WDM Networks (Optical Networks)
On the complexity of and algorithms for finding the shortest path with a disjoint counterpart
IEEE/ACM Transactions on Networking (TON)
A novel approach of backup path reservation for survivable high-speed networks
IEEE Communications Magazine
Availability analysis of span-restorable mesh networks
IEEE Journal on Selected Areas in Communications
Backup reprovisioning to remedy the effect of multiple link failures in WDM mesh networks
IEEE Journal on Selected Areas in Communications - Part Supplement
A multistate multipath provisioning scheme for combating node failures in telecom mesh networks
MILCOM'09 Proceedings of the 28th IEEE conference on Military communications
Exploiting excess capacity to improve robustness of WDM mesh networks
IEEE/ACM Transactions on Networking (TON)
Disaster survivability in optical communication networks
Computer Communications
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The capacity of a telecom fiber is very high and continues to increase, due to the advances in wavelength-division multiplexing (WDM) technology. Thus, a fiber-link failure may cause huge data (and revenue) loss. Reprovisioning (or re-optimization) of backup (or protection) bandwidth is an effective approach to improve network survivability while preventing existing services from unnecessary interruption. Most research works to date focus on applying backup-resource reprovisioning when a network failure occurs, or at some particular intervals over a certain time period. A network's state changes when any one of the following four events occurs: 1) a new connection arrives; 2) an existing connection departs; 3) a network failure occurs (e.g., a fiber cut); or 4) a failed network component (e.g., a fiber cut) is repaired. Moreover, backup-bandwidth rearrangement can also be triggered when resource overbuild (RO) [1] exceeds a predefined threshold or blocking occurs. In this study, we investigate the benefits of performing backup reprovisioning for part of (or all) the existing connections after network-state updates to improve network robustness as well as backup-bandwidth utilization in survivable telecom mesh networks. We study the effect of different backup reprovisioning periods (assuming no failure occurrence), which represents a tradeoff between capacity optimization and computation/reconfiguration overhead. We also examine the performance of an RO-threshold-triggered backup-reprovisioning approach. A wavelength-convertible network model and shared-path-protected routing strategy are assumed in this study. We consider a link-vector model in which a vector is associated with each link in the network, indicating the amount of backup bandwidth to be reserved on the link to protect against possible failures on other links. Our simulation results demonstrate that our approaches achieve better backup-capacity utilization and network robustness, compared to a conventional scheme which reprovisions backup paths for connections only when a network failure occurs.