%0 Journal Article
%A Pavón Mariño, Pablo
%A Aparicio Pardo, Ramón
%A Skorin-Kapov , Nina
%A García Manrubia, María Belén
%T Virtual topology design and flow routing in optical networks under multi-hour traffic demand
%D 2010
%@ 1387-974X
%U http://hdl.handle.net/10317/1541
%X This paper addresses the problem of finding a static
virtual topology design and flow routing in transparent optical
WDM networks under a time-varying (multi-hour) traffic
demand. Four variants of the problem are considered, using
fixed or dynamically adaptable (i.e., variable) flow routing,
which can be splittable or unsplittable. Our main objective is
to minimize the number of transceivers needed which make up
for the main network cost. We formulate the problem variants
as exact ILPs (Integer Linear Programs) and MILPs (Mixed
ILPs). For larger problem instances, we also propose a family
of heuristics based on the concept of domination between
traffic matrices. This concept provides the theoretical
foundations for a set of techniques proposed to reduce the
problem complexity. We present a lower bound to the network
cost for the case in which the virtual topology could be
dynamically reconfigured along time. This allows us to assess
the limit on the maximum possible benefit that could be
achieved by using optical reconfigurable equipment.
Extensive tests have been conducted, using both synthetically
generated and real-traced traffic demands. In the cases
studied, results show that combining variable routing with splittable flows obtains a significant, although moderate, cost
reduction. The maximum cost reduction achievable with
reconfigurable virtual topologies was shown to be negligible
compared to the static case in medium and high loads.
%K Ingeniería Telemática
%K Diseño virtual de la topología
%K Flujos de enrutamiento
%K Tráfico periódico
%K Dominación del tráfico
%K Virtual Topology Design
%K Flow routing
%K Periodic traffic
%K Traffic domination
%~ GOEDOC, SUB GOETTINGEN