Extending the p-cycle concept to path-segment protection
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ABSTRACT:
This work introduces a significant extension to the method of p-cycles for network protection. The main advance is the generalization of the p-cycle concept to protect multi-span
segments of contiguous working flow, not only spans that lie on the cycle or directly straddle the p-cycle. This effectively extends the p-cycle technique to include path protection or protection of any flow segment along a path as well as the original span protecting use of p-cycles. It also gives an inherent means of transit flow protection against node loss. We develop a capacity optimization model for the new scheme and compare it to prior p-cycle designs and other types of efficient mesh-survivable networks. Results show that path-segment-protecting p-cycles (“flow p-cycles” for short) have capacity efficiency near that of a
path-restorable network without stub release. An immediate
practical impact of the work is to suggest the use of flow p-cycles to protect transparent optical express flows through a regional network.
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