Efficient algorithms for routing dependable connections in WDM optical networks
IEEE/ACM Transactions on Networking (TON)
Fast optical layer mesh protection using pre-cross-connected trails
IEEE/ACM Transactions on Networking (TON)
Capacity-Efficient Protection with Fast Recovery in Optically Transparent Mesh Networks
BROADNETS '04 Proceedings of the First International Conference on Broadband Networks
A framework for service-guaranteed shared protection in WDM mesh networks
IEEE Communications Magazine
Extending the p-cycle concept to path segment protection for span and node failure recovery
IEEE Journal on Selected Areas in Communications
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In this paper, we introduce the Pre-cross-connected Segment First — PXSFirst protection scheme; a new path-based protection schemes for WDM optical networks. The goal of the PXSFirst scheme is to achieve fast recovery, while maximizing bandwidth sharing to improve bandwidth utilization. Similar to pre-cross-connected trails (PXTs) protection scheme, PXSFirst ensures that all backup paths are pre-cross-connected, and hence eliminates the switching configuration delay along backup paths. However, unlike the PXT scheme, where backup paths can only share trails, PXSFirst breaks backup paths into smaller segments by existing end nodes, and hence, increases the possibility of bandwidth sharing. Extensive simulation results for different network topologies and under different traffic patterns show that the proposed scheme has better blocking performance and less bandwidth utilization (an average of 11.0% reduction) compared to existing PXT protection schemes.