6.3D Frequency error for UL MIMO
25.1013GPPRelease 17TSUser Equipment (UE) radio transmission and reception (FDD)
For UE supporting UL MIMO, the UE modulated carrier frequency at each transmit antenna connector shall be accurate to within ±0.1 PPM observed over a period of one timeslot compared to the carrier frequency received from the Node B. These signals will have an apparent error due to Node B frequency error and Doppler shift. The signals from the Node B must be averaged over sufficient time that errors due to noise or interference are within the above ±0.1PPM figure. The UE shall use the same frequency source for both RF frequency generation and the chip clock.