Abstract
In this paper, we present two adaptive schemes, namely, global differentiated
availability-aware provisioning (G-DAP) and link-by-link differentiated availability-aware
provisioning (LBL-DAP) for connection provisioning in optical transport networks
under dual failure assumption. G-DAP attempts to determine a feasible sharing
degree for each availability class for the links in the network globally.
As an enhancement to G-DAP, LBL-DAP tries to determine a feasible sharing
degree per availability class on each link. Connections belong to one of the
five availability classes with the availability requirements of 0.98, 0.99,
0.999, 0.9999, and 0.99999, which are specified in their service level agreement
(SLA). We compare the performance of the proposed schemes with a conventional
service provisioning scheme, compute a feasible solution (CAFES) under the
NSFNET and European optical network (EON) topologies. The simulation results
show that the proposed schemes introduce better availability per connection
and lower blocking probabilities. LBL-DAP performs the best by monitoring
the shareability status of each link periodically with respect to the metrics
studied, and decreases resource overbuild.
© 2009 IEEE
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