Doppler shift frequency determination and compensation

A method comprising:

• receiving, at a user equipment-(UE), a first reference signal (RS) transmitted from a first transmission reception point (TRY) on a third frequency;
• and
• transmitting, from the UE, a second RS to the first TRP on the third frequency, wherein the third frequency is based on a first frequency on which the first TRP transmitted the first RS and has the same spatial relation as the first RS;
• wherein a first Doppler shift frequency is determined by the first TRP using the first frequency and a second frequency on which the second RS is received by the first TRP.

An apparatus for wireless communication, the apparatus comprising:

• a processor;
• and
• a memory coupled to the processor, the memory comprising instructions executable by the processor to cause the apparatus to:
• transmit, from a first transmission reception point (TRP), a first reference signal (RS) to a user equipment (UE) on a first frequency;
• receive, at the first TRP, a second RS from the UE on a second frequency, wherein the second frequency is based on a third frequency on which the UE received the first RS;
• and
• determine a first Doppler shift frequency using the first frequency and the second frequency.