PROJECT TITLE :

Energy-Minimized Design and Operation of IP Over WDM Networks With Traffic-Aware Adaptive Router Card Clock Frequency

ABSTRACT:

With the explosive expansion of the information and communication technology (ICT) section, its energy saving has become an important issue and is receiving wide interest. During this study, we have a tendency to propose an adaptive clock frequency strategy for router cards to reduce the whole energy consumption of an IP over WDM network. Rather than continually running at full speed, the clock frequency of a router card is adaptively adjusted in step with its actual-carried traffic demand. Given forecast traffic demand matrixes between completely different node pairs in several time slots, we have a tendency to develop a mixed integer linear programming (MILP) model to optimally select the clock frequencies for every router card in different time slots such that the total energy consumption of the router cards is minimized. For lower computational complexity, the optimization model is also decomposed into two models, that correspond to the 2 subproblems of the optimization downside. The primary subproblem minimizes the total number of router cards at each network node based on the height-hour traffic, and therefore the second subproblem optimally chooses the clock frequencies for every router card in different time slots. Because of the high-computational complexity of the MILP models, we tend to additionally develop an economical heuristic algorithm, in that 2 key steps that tackle the two subproblems are specifically developed. The joint MILP model provides a lower bound on the energy consumption, that shows to save lots of a lot of than 40% energy compared to the case without adaptive router card clock frequency. It's also found that the heuristic algorithm is economical and performs close to the MILP models. In addition, the results also show that a router card supporting a little variety of discrete clock frequencies will perform close to a card with continuously modified clock frequencies, and the advantage of adaptive clock frequency becomes weak with increasing router card power consumption overhead.