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Title: Design and Operation Strategies for IP-OVER-WDM Networks with Awareness of Cost and Energy Efficiency
Authors: Dey, S. K.
Keywords: Electrical Engineering
Issue Date: 2017
Publisher: IIT Patna
Series/Report no.: TH-77;
Abstract: With rapid growth of traffic volume in telecommunication networks, a larger number of network equipment with higher capacity and enhanced processing speed is required to accommodate the traffic. Thus, expenditure due to cost and energy consumption (EC) of network equipment is increasing. Improving efficiency in overall expenditure due to cost and EC for setting up and operating the backbone IP-over-WDM (IPoWDM) network is an important area of research. In most of the research works towards improving efficiency in spending, either the cost or EC is considered during the design phase (i.e., the network planning phase or the phase wherein capacity is provisioned for a new network). However, the most cost-efficient network may not always be the most energye fficient. Thus, during the network design phase, the cost and EC due to network equipment should be considered together to optimize the overall network expenditure. Traffic grooming using IP layer equipment (e.g., core IP router) and traffic bypassing in optical domain (using optical cross-connect) may be optimally used to minimize the overall expenditure due to cost and EC. Increase in EC also affects the environment by emitting enormous amount of greenhouse gases (GHGs) which are mainly produced due to non-renewable energy (NRE) consumption. As data centers (DCs) consume huge amount of energy, GHG emission may be reduced by reducing NRE consumption in DCs. As the availability of renewable energy (RE) at different DC locations and time intervals varies, a service may need to be migrated from one DC providing the service at a given time interval to another DC at the next time interval to reduce NRE consumption. In view of the above, we focus on designing and operating the backbone IPoWDM network with the objective to minimize the combined expenditure (due to cost and EC of network equipment) for setting up and operating the network over a given time period (referred to as the planning period). In this regard, we take into consideration the constraints due to bidirectional nature of network equipment and the physical layer impairment effect on transmission in backbone network. We design the IPoWDM network with the optimum traffic grooming and traffic bypass techniques to achieve the highest efficiency in overall expenditure. We also explore operational schemes for service provisioning with facility of service migration from DCs to reduce NRE consumption in presence of time-varying bandwidth demand and RE supply at the nodes. We optimize the number of services to be migrated at different time intervals based on the the savings in NRE consumption and the cost (i.e., penalty) to be incurred with reference to service migration overhead and disruption in ongoing services. As service migration may also result in prohibitively large end-to-end propagation delay (due to large path length) at a given time interval, we judiciously allow service migration with due consideration of propagation delay tolerance constraint.
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