ABSTRACT
Different Network Approaches (EON, WDM SLR, and WDM MLR) ..... 416 17.6.2.2 Algorithms for a Static Scenario without Protection ................................. 417 17.6.2.3 Algorithms for a Static Scenario with Protection ...................................... 418 17.6.2.4 Algorithms for a Dynamic Scenario .......................................................... 419
17.6.3 Simulation Parameters .............................................................................................. 420 17.6.3.1 Power Consumption Values ....................................................................... 420 17.6.3.2 Network Topologies ................................................................................... 422
17.6.4 Description of Case Studies and Simulation Results ................................................ 423 17.6.4.1 Case Study 1-Unprotected Static Scenario (Offline Problem) ................ 423 17.6.4.2 Case Study 2-Protected Static Scenario (Offline Problem) ....................424 17.6.4.3 Case Study 3-Dynamic Scenario (Online Problem) ............................... 426
Internet traffic demand has been growing at a rate of 40%–60% per annum for the past few years, forcing operators to upgrade their networks to handle these new capacity requirements. A network upgrade usually implies additional economic efforts resulting from the need for new infrastructure deployments, increased labor costs, and higher electrical power consumption. In this context, telecom operators are burdened with cost optimization as a means to maintain the difficult balance between high-performance services and limited revenues. A reduction of capital expenditures (CAPEX) and operational expenditures (OPEX) is key to achieving this target. Process automation, network data mining, control plane-driven architectures, and many other functionalities are being increasingly deployed for this purpose. Power consumption has recently become a critical budget item because of its growth in volume and cost. Moreover, environmental issues are gaining an everincreasing relevance as well and receive special attention in the telecom operators’ policies.
