Abstract
Energy consumption in a network is becoming the physical limit against
the everlasting increase of network traffic in the near future. Current network
equipment consumes energy inefficiently due to poor energy-load proportionality
of network equipment which causes a vast amount of energy consumption even
in an idle state. We investigate and model the energy consumption of packet
optical transport networks. Employing integer linear programming, we model
and optimize the energy consumption of IP/WDM (IP/WDM) networks with traffic-grooming
cross layer designs. Our study shows that energy savings in IP/WDM networks
with traffic grooming is not effective unless IP layer equipment is energy
proportional. In addition, different network planning schemes are required
with respect to energy proportionality of network equipment.
© 2012 IEEE
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