Abstract
Green House Gas (GHG) emissions mainly come from the consumption of non-renewable energy. To reduce GHG
emissions of IP over WDM networks, we propose to maximize renewable energy usage at each network node location so as
to reduce the consumption of non-renewable energy. A “Follow the Sun, Follow the Wind” strategy is
proposed for the IP over WDM network to periodically reconfigure the lightpath virtual topology to enable more
lightpaths to start or end at nodes where maximum renewable energy is available. We develop a mixed integer linear
programming model to design new lightpath virtual topologies. Since the computational complexity of the optimization
model is excessive, we also propose a simple but efficient heuristic algorithm to tackle this. Our results indicate
that a network operated in this way can significantly reduce non-renewable energy consumption as illustrated in the
example network scenarios considered.
© 2014 IEEE
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