NDLI: Star-block design in two-level survivable optical networks

Content Provider	ACM Digital Library
Author	Yang, Ching-Fang Chen, Jian-Hong Li, Jung-Shian
Copyright Year	2011
Abstract	An efficient fault restoration framework is proposed for accomplishing loopback recovery in optical networks. The proposed $\textit{p}-cycle-based$ framework achieves both a minimal spare capacity requirement and a rapid restoration time. In the proposed approach, an algorithm designated as Star-Block is used to simplify the original topology to a 2-connected graph and to partition the graph into multiple blocks, where each block contains a center node and the minimum number of neighboring nodes that collectively form a complete cycle. The simplified graph is then restored to the original topology using conventional graph rules. The Block Selection algorithm is then used to assign the edges belonging to multiple blocks to an appropriate block for fault recovery purposes. Within each block, the working flows are restored in real-time via local $\textit{p}-cycles$ on the on-cycle and spoke fibers. The performance of the proposed protection framework is evaluated numerically in terms of the spare capacity to working capacity ratio and the length of the restoration path. The framework has a better spare capacity efficiency than existing loopback recovery schemes or the conventional $\textit{p}-cycles$ approach. In addition, the Star-Block decomposition algorithm shortens the average length of the restoration path and therefore reduces the restoration time. Finally, the protection scheme not only provides a differentiated recovery service for traffic with different QoS requirements in the event of single-link failures within a single block, but also supports multiple-fault restoration for the case in which multiple single-link failures occur simultaneously.
Starting Page	526
Ending Page	539
Page Count	14
File Format	PDF
ISSN	10636692
DOI	10.1109/TNET.2010.2069571
Volume Number	19
Issue Number	2
Journal	IEEE/ACM Transactions on Networking (TON)
Language	English
Publisher	Association for Computing Machinery (ACM)
Publisher Date	2011-04-01
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Star-Block algorithm Block selection algorithm Multiple-fault restoration Restoration path Spare capacity efficiency Survivable optical networks
Content Type	Text
Resource Type	Article
Subject	Electrical and Electronic Engineering Computer Networks and Communications Software Computer Science Applications

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