Abstract
Feature Issue on
Next-Generation WDM Network Design and Routing (WDMN). The
optimal choice of routing and wavelength assignment (RWA) for the working and
protection path-pair of the newly generated demand request is often a complex
problem in reliable wavelength-division-multiplexed (WDM) networks subject to
dynamic traffic. The challenge is twofold: how to provide the required reliability
level without over-reserving network resources and how to find a good solution of
the RWA problem under constrained computational time. Two important contributions
are made. First, the shared path protection (SPP) switching scheme is generalized to
guarantee the required (differentiated) level of reliability to all arriving
demands, while, at the same time, ensuring that they contain the required amount of
reserved network resources. This generalization is referred to as SPP-DiR. Second,
an approach for choosing the working and protection path-pair routing for the
arriving demand is proposed. The approach is based on a matrix of preselected
path-pairs: the disjoint path-pair matrix (DPM). Results show that, when the SPP-DiR
scheme is applied, a small reduction in demand reliability corresponds to a
significant reduction of the required network resources, when compared with the
conventional SPP. In turn, the demand blocking probability may be reduced more than
one order of magnitude. It is also shown that the DPM approach is suitable for
obtaining satisfactory RWA solutions in both SPP-DiR and conventional SPP networks.
The use of the DPM is most suited when the time for solving the RWA problem is
constrained, e.g., when demand requests must be served swiftly.
© 2003 Optical Society of America
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