Energy-Aware Dynamic Virtual Optical Network Embedding In EON

The current network and cloud data centers are designed for peak traffic load and excess supply of the substrate optical network resources can make sure the normal operation of the services.However,it will result in the huge waste of energy consumption for the reason of low utilization of the substrate optical network resources.Network virtualization is widely considered to improve the efficiency of network infrastructure by allowing multiple virtual networks to coexist on a shared substrate network.In this paper,this paper considered energy-aware dynamic virtual optical network embedding(VONE)problem in elastic optical networks(EONs)equipped with sliceable transponders(TPs)in each node.In this regard,two energy-saving policies for data centers(DCs)and TPs are designed in the process of the node mapping and link mapping,respectively.Hence,two schemes are developed for dynamic VONE: i)DC-EA scheme,which only considers DC energy-saving in the node mapping;and ii)DC&TP-EA scheme,which considers the energy saving for both the DCs in the node mapping and TPs in the link mapping,simultaneously.In order to evaluate the energy-saving performances of the proposed two schemes,a benchmark scheme is also realized which only maintains traffic-balancing(TB)policy without any energy-saving consideration.The extensive simulation results indicated that our proposed DC&TP-EA scheme achieves the maximum power saving efficiency,compared with the DC-EA and TB schemes.Also,the effect of DC energy saving is very remarkable in the DC-EA or DC&TP-EA scheme when the traffic load is smaller.With the increase of traffic load,the DC energy saving may matter less,while the TP energy-saving plays a more and more important role.Besides,both the DC&TPEA and DC-EA schemes have similar blocking performance as that of the TB scheme.The main idea of the TB scheme is to improve the request blocking probability.Therefore,it demonstrates the effectiveness and superiority of our proposed schemes for VONE.