f ( n ( t ) , t )

Power consumption in the subnet


Total number of ports on a router


Overall energy of the router

a l ( t ) + b

Gain of energy obtained during the deactivation of the ports

f ( k ( i , j , t ) )

The state of ports in s/networks at time t


Quality of service perceived by the user


Set of all requests at the moment t

f s , p ( t ) F ( t )

Observed request of a user at the instant t from a point s to p

R ( F ( t ) )

Routing of all requests at time t (see the routing algorithm)

n ( t ) N ( t )

The subnet included in the network at time t

Q ( f ( t ) )

Quality of service set to not exceeded for all requests observed