Abstract
Fueled by the growing resource crisis and potential economic
incentives, significant research attention has recently been devoted to improving
the power efficiency of IP over Wavelength-Division-Multiplexing (WDM) networks.
Previous works on power savings in IP over WDM networks have required explicit
knowledge of the traffic between each network node pair and the resource assignment
of each fiber link. However, it is difficult to accurately estimate this information
in live networks due to the inherent features of IP traffic, e.g., bursts,
unpredictability and variability. Furthermore, the number of ports consumed
in Optical Cross-Connects (OXCs) trends to grow due to the use of traffic
grooming and optical bypasses for power savings. Therefore, it is necessary
to achieve joint power efficiency and port savings in live IP over WDM networks
where the traffic between each network node pair and resource assignment of
each fiber link are not known in advance. Since the problem of grooming, routing
and wavelength/waveband assignment is NP-hard, a new heuristic approach, the
Robust and Integrated Grooming (RIG) algorithm, is proposed in this paper.
RIG uses a novel metric, a power ratio defined by the power consumed over
the power saved, to evaluate the power efficiency. By determining the Traffic
Distribution Vector (TDV) with the lowest power ratio using the Minimizing
Power Ratio First (MPRF) method, the previously unknown information can be
acquired. By performing traffic matrix transformations, we construct a green
optical virtual topology to groom connection demands into established lightpaths
using Hybrid Grooming Schemes (HGSs) for power efficiency and waveband switching
for port savings. The simulation results demonstrate that RIG can, on average,
achieve power efficiency and port savings of 15% and 32%, respectively, compared
to state-of-the-art robust grooming methods. To the best of our knowledge,
this paper is the first work addressing robust and integrated grooming for
power- and port-cost-efficient design in IP over WDM networks.
© 2011 IEEE
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