OTA estimation of an RF parameter of a radio transmitter

A controller of a radio transmitter for enabling over-the-air, OTA, estimation of a radio frequency parameter of the radio transmitter during a test time interval, wherein the radio transmitter is configured for transmission in a set of beams, the controller comprising processing circuitry, the processing circuitry being configured to cause the controller to:

• identify a subset of beams in the set of beams that, during the test time interval, are unused for transmission of scheduled signals;
• and
• instruct the radio transmitter to transmit, during the test time interval, an unscheduled signal in the subset of beams, whilst also transmitting the scheduled signals in those beams of the set of beams that are used for transmission of the scheduled signals, for enabling estimation of the radio frequency parameter of the radio transmitter.

A non-transitory computer readable medium comprising a computer program for enabling over-the-air, OTA, estimation of a radio frequency parameter of a radio transmitter during a test time interval, wherein the radio transmitter is configured for transmission in a set of beams, the computer program comprising computer code which, when run on processing circuitry of a controller of the radio transmitter, causes the controller to:

• identify a subset of beams in the set of beams that, during the test time interval, are unused for transmission of scheduled signals;
• and
• instruct the radio transmitter to transmit, during the test time interval, an unscheduled signal in the subset of beams, whilst also transmitting the scheduled signals in those beams of the set of beams that are used for transmission of the scheduled signals, for enabling estimation of the radio frequency parameter of the radio transmitter.