Figure 1
From: Fair greening of broadband access: spectrum management for energy-efficient DSL networks
Characterization of working points in the achievable rate region ( left ) and achievable power region ( right ) for DSM designs (6)-(13). DSM designs (6) and (8) can be situated anywhere on the boundary of the rate region and power region, respectively, depending on the chosen weights w n and t n that reflect the relative importance of the users n. DSM design (10) corresponds to a reduced rate region as α <1. DSM designs (8)(11)(12)(13) are all Pareto-optimal in power as they correspond to power minimizing DSM designs subject to minimum data rate constraints, i.e., DSM design (8) with a specific set of weights t n .