Distributed directional electromagnetic field power back-off framework with open radio access network compliance

A method in a digital unit configured to interoperate with a radio unit in a network node, the network node configured to communicate with a plurality of wireless devices, WDs, the method comprising:

• for each of a plurality of transmission time intervals, TTIs, and for each WD of the plurality of WDs, mapping a transmission intended for the WD to a direction of a sector encompassing the WD;
• for each of a plurality of control step intervals and for each of a plurality of directions:
• receiving an estimated time-average power from the radio unit;
• and
• comparing the received estimated time-average power to a threshold corresponding to the direction;
• and
• applying power scaling during a control step interval, the power scaling being applied to scale a power of transmission in each direction for which the received estimated time-average power exceeds the threshold corresponding to the direction.

A radio unit configured to interoperate with a digital unit in a network node, the network node configured to communicate with a plurality of wireless devices, WDs, the radio unit comprising processing circuitry configured to:

• receive from the digital unit a plurality of directions and at least one power scaling factor, each power scaling factor corresponding to a direction determined by the digital unit to be a direction in which power is to be scaled;
• for each of a plurality of transmission time intervals, TTIs, and for each of a plurality of directions, estimate a transmission power for the direction;
• for each of a plurality of control step intervals and for each of the plurality of directions:
• estimate a time-average power for the direction based at least in part on an average of a set of estimated transmission power values for the direction during a control step interval;
• and
• transmit the time-average power for each direction to the digital unit.

A method in a radio unit configured to interoperate with a digital unit in a network node, the network node configured to communicate with a plurality of wireless devices, WDs, the method comprising:

• receiving from the digital unit a plurality of directions and at least one power scaling factor, each power scaling factor corresponding to a direction determined by the digital unit to be a direction in which power is to be scaled;
• for each of a plurality of transmission time intervals, TTIs, and for each of a plurality of directions, estimating a transmission power for the direction;
• for each of a plurality of control step intervals and for each of the plurality of directions:
• estimating a time-average power for the direction based at least in part on an average of a set of estimated transmission power values for the direction during a control step interval;
• and
• transmitting the time-average power for each direction to the digital unit.