Recently, fusion performance has been considerably improved in advanced tokamak scenarios via optimisation of current density profiles. Experiments at ASDEX Upgrade have concentrated on scenarios with low or zero magnetic shear in the centre. These discharges have improved confinement and stability in stationary conditions. The current density profile is maintained by MHD modes (fishbones). As extrapolation of these MHD activities for a reactor is unclear, it would be desirable to sustain this type of current profile with external current drive methods.