Abstract
Dynamic provisioning of restorable bandwidth guaranteed paths is a
challenge in the design of broad-band transport networks, especially the
next-generation optical networks. A common approach is called
(failure-independent) path protection, whereby for every mission-critical
active path to be established,a link (or node) disjoint backup path (BP)
is also to be established. To optimize network resource utilization,
shared path protection should be adopted, which often allows a new BP to
share the bandwidth allocated to some existing BPs. However, it usually
leads the backup paths to use too many links, with zero cost in term of
additional backup bandwidth, along its route. It will violate the
restoration time guarantee. In this paper, we proposed novel integer
linear programming (ILP) formulations by introducing two parameters
(ε and µ ) in both the sharing with complete information (SCI)
scheme and the distributed partial information management (DPIM) scheme.
Our results show that the proposed ILP formulations can not only improve
the network resource utilization effectively,but also keep the BPs as
short as possible.
[IEEE ]
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