Embodiments herein relate to a radio network node for scheduling a radio resource within a radio communications network. The radio network node comprises at least two antenna ports over which communication is performed using a respective power amplifier over each antenna port out of the at least two antenna ports. The radio network node determines a utilization factor of power of each power amplifier when a first user equipment is assigned to the radio resource. The radio network node further determines a utilization factor of power of each power amplifier when a second user equipment is assigned to the radio resource. The radio network node then schedules the first user equipment or the second user equipment to the radio resource based on the determined utilization factors.
