Energy-minimized Design For Survivable Backbone Optical Networks

With the rapid development of Internet technology,energy saving has become a critical factor for the sustainable development of communication networks.The optical backbone network takes a high percentage of total energy consumption of whole communication networks,as it is an important part of optical communication networks.Thus,it is of great importance to optimize energy consumption of the backbone optical network.Meanwhile,because of the high transmission capacity of each optical channel in the backbone optical network,a large amount of data will be lost upon a network failure such as a fiber cut,which will cause irreparable loss to users,and therefore survivability is also important for the backbone optical network.This thesis looks into energy-saving design for an IP over WDM network with the support of network survivability.First,an energy consumption model is proposed for a router card that supports sleeping mechanism.By considering different port and card protection schemes,we minimize the energy consumption of an IP over WDM network by developing corresponding linear programming models and heuristic algorithms.The simulation results show that the protection scheme of port sharing can significantly reduce energy consumption of the whole network.Second,we also evaluate how different network protection techniques including SBPP and PR can influence energy consumption of an IP over WDM network.The simulation results show that SBPP can realize a similar energy consumption to that of PR,but the former is relatively simpler in network operation than the latter.