The hop-limit approach for spare-capacity assignment in survivable networks
IEEE/ACM Transactions on Networking (TON)
Optimal capacity placement for path restoration in STM or ATM mesh-survivable networks
IEEE/ACM Transactions on Networking (TON)
IEEE Communications Magazine
IEEE Journal on Selected Areas in Communications
Hamiltonian p-cycles for fiber-level protection in semi-homogeneous homogeneous and optical networks
IEEE Network: The Magazine of Global Internetworking
A cross-layer ILP formulation for finding p-cycles in all-optical networks
GLOBECOM'09 Proceedings of the 28th IEEE conference on Global telecommunications
ILP formulations for p-cycle design without candidate cycle enumeration
IEEE/ACM Transactions on Networking (TON)
Evaluation of link protection schemes in physically impaired optical networks
ICC'09 Proceedings of the 2009 IEEE international conference on Communications
Dynamic provisioning system for bandwidth-scalable core optical network
MILCOM'09 Proceedings of the 28th IEEE conference on Military communications
The threshold hop-limit effect in p-cycles: Comparing hop- and circumference-limited design
Optical Switching and Networking
Photonic Network Communications
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p-Cycles offer an approach to protection of optical transport networks which is as fast as a ring-based network but with mesh-like capacity efficiency. One misconception about p-cycle designs seems to be that they involve long protection paths, even though it is trivial to limit the circumference of cycles admitted to the design problem. In addition, through straddling span considerations the average protection path on a p-cycle is actually shorter than in a corresponding ring. Nonetheless there are some open questions regarding path and cycle circumference limit effects with p-cycles. One question is whether p-cycle networks exhibit a "threshold hop-limit" effect corresponding to that well-known aspect of span-restorable mesh networks. (Beyond the threshold hop-limit there are negligible savings in capacity.) To study this question we extend the existing p-cycle network design theory to include the capability of direct restriction of protection path lengths, rather than indirect restriction through circumference limits. A second, quite practical question is to ask how well simple limitation of cycle circumferences serves as a surrogate for a more involved design method of directly asserting a hop (or distance) limit on the maximum length of protection paths. The answers to the questions and the methods developed to address them both enhance our ability to design p-cycle networks in which optically transparent length may affect transmission quality, or where the length of protection paths may affect cost if regeneration is required en route of a protection path. The main findings are that p-cycles do exhibit threshold hop-limiting effects (at about two or three hops above those in corresponding mesh networks) and that cycle limiting is a simple and effective surrogate for direct limitation on path lengths in p-cycle design problems.