Improvements in and relating to Doppler compensation in a non-terrestrial telecommunication network

摘要

Compensating for Doppler shift in a telecommunication network comprising a terrestrial User Equipment, UE, and a base station, gNB, at a satellite. The base station, gNB 20, estimates Doppler shift information S100, transmits the Doppler shift information to the UE 10 S110, and the UE 10 adjusts a transmission frequency to transmit to the base station on the basis of the received Doppler shift information S120. The base station, gNB, may comprise a Doppler shift estimator operable to estimate Doppler shift on the basis of one or more inputs including: gNB position, gNB spot beam coverage, gNB spot beam pattern, gNB velocity and UE signal. The Doppler shift information may be included in a System Information Block, SIB, transmission or in a Random Access response message, Msg2, in response to the base station receiving a Random Access message, Msg1, from the UE.