Network-wide power management in computer networks

Two approaches to dynamic power management in energy-aware computer networks - methodological considerations

“…We modified the dynamic power management of energyaware computer networks model presented in [6] to capture these situations, when the users' demands are so high, that there is no admissible solution of the problem LNb (2)-(11). We suggest to use then a two-criteria model with flow rates as additional decision variables.…”

“…As in the paper [6] constraints (3)- (5) determine the number of ports and routers that are used for data transmission. The conditions (6) assure, that each edge can be in one energyaware state.…”

“…The conditions (6) assure, that each edge can be in one energyaware state. The constraints (7) are formulated according to 1st Kirchhoff's law applied to source, destination and transit nodes, and finally, the constraints (8), (9) assure, that the flow will not exceed the capacity of a given edge.…”

“…The paper [6] presented a model of energy-aware router, an architecture of a control framework and various formulations of a network-wide energy saving optimization problem. They start from the exact mixed integer linear programming (MILP) formulation, which is aimed at solving the problem of a minimum energy routing.…”

“…In this paper first a model with fixed flow rates inspired by the paper [6] will be shortly presented and assessed. Then, an improved version of it with flexible rates -in the authors' opinion much more practical -will be proposed and discussed.…”