Hybrid Survivability Schemes Achieving High Connection Availability With a Reduced Amount of Backup Resources
2013 (English)In: Journal of Optical Communications and Networking, ISSN 1943-0620, E-ISSN 1943-0639, Vol. 5, no 10, A152-A161 p.Article in journal (Refereed) Published
Maximizing connection availability in WDM networks is critical because even small disruptions can cause huge data losses. However, there is a trade-off between the level of network survivability and the cost related to the backup resources to be provided. The 100% survivability can be achieved by dedicated path protection with multiple pre-reserved protection paths for each provisioned connection, i.e., DPP (1:N). Unfortunately, the blocking probability performance of DPP (1:N) is negatively affected by the large number of pre-reserved backup wavelengths standing-by unutilized. On the other hand, path restoration (PR)-based solutions ensure good blocking performance at the expense of lower connection availability.
The work in this paper aims at finding hybrid network survivability strategies that combine the benefits of both techniques (i.e., high availability with low blocking rate). More specifically, the paper focuses on a double link failure scenario and proposes two strategies. The first one, couples dedicated path protection DPP (1:1) with path restoration (referred to as DPP + PR) to minimize the number of dropped connections. The second scheme adds up the concept of backup reprovisioning (BR), referred to as DPP + BR + PR, in order to further increase the connection availability achieved by DPP + PR. Integer Linear Programming (ILP) models for the implementation of the proposed schemes are formulated. Extensive performance evaluation conducted in a PCE-based WDM network scenario shows that DPP + BR + PR and DPP + PR can significantly lower the blocking probability value compared to DPP (1:2) without compromising too much in terms of connection availability.
Place, publisher, year, edition, pages
The Optical Society of America , 2013. Vol. 5, no 10, A152-A161 p.
Availability, Backup reprovisioning, Failure recovery, Path protection, Path restoration, Survivability, WDM
Research subject SRA - ICT
IdentifiersURN: urn:nbn:se:kth:diva-127252DOI: 10.1364/JOCN.5.00A152ISI: 000326507000017ScopusID: 2-s2.0-84887545182OAI: oai:DiVA.org:kth-127252DiVA: diva2:643682
QC 20131209. Updated from accepted to published.2013-08-282013-08-282016-04-19Bibliographically approved