Heated-flow-first traffic grooming for power and delay aware optical network

Traffic grooming technique in an optical network economizes costly optical resource, or the wavelength channels, by sharing it between sub-wavelength granularity flows. For a higher wavelength channel utilization ratio, a traffic grooming solution often finds longer detour paths to provision a flow. The longer traversing of a flow cause higher propagation delay. In case of delay-critical applications, one might be even willing to pay more power cost for low delay. In this paper we propose a heuristic traffic grooming algorithm for balancing between power and delay in a typical IP-over-WDM network. The suggested heuristic benefits a power consumption savings as much as a conventional power-aware heuristic algorithm. Additionally, it achieves a shorter delay by giving a high priority to the short physical distance flow when route. In comparison to the previous studies of the power-aware traffic grooming heuristic, we investigate both power and delay performances with our heuristic algorithm.