Abstract
Elastic optical networks (EONs) enable network operators to have agile bandwidth management in the
optical layer. In this paper, we investigate dynamic and adaptive bandwidth defragmentation (DF) in EONs with
time-varying traffic using connection reconfigurations. We consider how to design DF procedure in a systematic way,
and study the problems that have not been fully explored so far. Basically, we divide the procedure design into four
subproblems: “How to reconfigure?,” “
How to migrate traffic?,” “When
to reconfigure?,” and “What to reconfigure?,”
and solve them sequentially. For “How to reconfigure?,” we
investigate the combination of routing and spectrum assignment (RSA) algorithms for DF, i.e., the RSA algorithm that
the connections are originally served with and the algorithm that they are re-optimized with. For “
How to migrate traffic?,” we propose to construct a dependency graph
to represent the relations among the selected connections and to use it to assist the best-effort traffic migration. A
move-to-vacancy method is also proposed to further reduce the traffic
disruptions. For “When to reconfigure?” and “
What to reconfigure?,” we propose intelligent timing selection and
adaptive DF ratio selection methods to tackle the tradeoff between the bandwidth blocking probability (BBP)
performance and operational complexity. Simulation results show that the algorithm with both methods implemented
(DF-AT-AR) achieves better tradeoff between BBP performance and operational complexity, when compared with existing
algorithms.
© 2013 IEEE
PDF Article
More Like This
Cited By
You do not have subscription access to this journal. Cited by links are available to subscribers only. You may subscribe either as an Optica member, or as an authorized user of your institution.
Contact your librarian or system administrator
or
Login to access Optica Member Subscription