Beam direction selection for a radio communications device

A radio communications device for selecting beam direction for the radio communications device, the radio communications device comprising processing circuitry, the processing circuitry being configured to cause the radio communications device to:

• obtain radio channel estimates of a radio channel on which radio waves have been transmitted between the radio communications device and another radio communications device at an angle of arrival and departure;
• determine a Doppler shift from the radio channel estimates;
• determine speed, Vr, of the radio communications device;
• determine a radial velocity based on the Doppler shift, the radial velocity defining a Doppler speed, Vd;
• estimate at least one of the angle of arrival and departure of the radio waves based on the Doppler shift, wherein multiple Doppler shifts are determined from the radio channel estimates, the multiple Doppler shifts defining a Doppler spread of the radio channel estimates;
• and
• select a beam direction for a signal to be transmitted between the radio communications device and the another radio communications device over the radio channel according to the estimated at least one of the angle of arrival and departure.

A radio communications device for selecting beam direction for the radio communications device, the radio communications device comprising:

• processing circuitry;
• and
• a computer storage device storing instructions that, when executed by the processing circuitry, causes the radio communications device to:
• obtain radio channel estimates of a radio channel on which radio waves have been transmitted between the radio communications device and another radio communications device at an angle of arrival and departure;
• determine a Doppler shift from the radio channel estimates;
• determine speed, Vr, of the radio communications device;
• determine a radial velocity based on the Doppler shift, the radial velocity defining a Doppler speed, Vd;
• estimate at least one of the angle of arrival and departure of the radio waves based on the Doppler shift, wherein multiple Doppler shifts are determined from the radio channel estimates, the multiple Doppler shifts defining a Doppler spread of the radio channel estimates;
• and
• select a beam direction for a signal to be transmitted between the radio communications device and the another radio communications device over the radio channel according to the estimated at least one of the angle of arrival and departure.