1 . A remote unit, comprising: a receiver that receives a configuration of channel state information (CSI) Resource Setting associated with a CSI Report Setting for Doppler Shift reporting, wherein the CSI Resource Setting includes one or more tracking resource signal (TRS) resources; a processor that estimates a Doppler shift for each of the TRS resources included in the Resource Setting; and a transmitter that transmits the estimated Doppler shift(s) using a physical uplink control channel (PUCCH) or physical uplink shared channel (PUSCH) resource.
2 . The remote unit of claim 1 , wherein, the Doppler shift is represented by a N-bits value in the range [ΔF, 0] and a 1-bit sign.
3 . The remote unit of claim 2 , wherein, N is equal to 7, and the 7-bits value has a (ΔF/128) Hz step size.
4 . The remote unit of claim 3 , wherein, ΔF is the maximum Doppler shift in term of sub-carrier spacing without sign, and is configured by radio resource control (RRC) signaling.
5 . The remote unit of claim 1 , wherein, when the number of TRS resources included in the CSI Resource Setting is K, O CPU =1 CPU or K CPUs are occupied for estimating and reporting K estimated Doppler shift(s), wherein K is a positive integer.
6 . The remote unit of claim 1 , further comprising: receiving each of the TRS resource(s) transmitted with a frequency that has not been compensated by the Doppler shift.
7 . The remote unit of claim 6 , further comprising: receiving demodulation reference signal (DM-RS) port(s) of signal frequency network physical downlink control channel (SFN-PDCCH) or signal frequency network physical downlink shared channel (SFN-PDSCH) transmitted with a frequency that has been compensated by the Doppler shift, wherein the DM-RS port(s) are Quasi Colocationed (QCLed) with the TRS resource(s) with Doppler spread, average delay, delay spread.
8 . A transmission and reception point (TRP), comprising: a transmitter that transmits a configuration of channel state information (CSI) Resource Setting associated with a CSI Report setting for Doppler Shift estimation and reporting, wherein the CSI Resource Setting includes one or more tracking reference signal (TRS) resources; and a receiver that receives a physical uplink control channel (PUCCH) or physical uplink shared channel (PUSCH) resource carrying an estimated Doppler shift for each of the TRS resources included in the CSI Resource Setting.
9 . The TRP of claim 8 , further comprising: transmitting a CSI reference signal (CSI-RS) resource with a frequency that has been compensated by each of the estimated Doppler shift(s), wherein each of the CSI-RS resource(s) is Quasi Colocationed (QCLed) with a synchronization signal block (SSB) with average delay.
10 . The TRP of claim 9 , wherein each of the CSI-RS resource(s) is further QCLed with the SSB with spatial reception (RX) filter.
11 . The TRP of claim 8 , further comprising: transmitting each of the TRS resource(s) with a frequency that has not been compensated.
12 . The TRP of claim 11 , wherein the transmitter is further configured to: transmit DM-RS port(s) of signal frequency network physical downlink control channel (SFN-PDCCH) or signal frequency network physical downlink shared channel (SFN-PDSCH) with a frequency that has been compensated by the Doppler shift, wherein the DM-RS port(s) are QCLed with the TRS resource(s) with Doppler spread, average delay, delay spread.
13 . (canceled)
14 . (canceled)
15 . A method, comprising: receiving a configuration of channel state information (CSI) Resource Setting associated with a CSI Report Setting for Doppler Shift reporting, wherein the CSI Resource Setting includes one or more tracking resource signal (TRS) resources; estimating a Doppler shift for each of the TRS resources included in the Resource Setting; and transmitting the estimated Doppler shift(s) using a physical uplink control channel (PUCCH) or physical uplink shared channel (PUSCH) resource.
16 . The method of claim 15 , wherein, the Doppler shift is represented by a N-bits value in the range [ΔF, 0] and a 1-bit sign.
17 . The method of claim 16 , wherein, N is equal to 7, and the 7-bits value has a (ΔF/128) Hz step size.
18 . The method of claim 17 , wherein, ΔF is the maximum Doppler shift in term of sub-carrier spacing without sign, and is configured by radio resource control (RRC) signaling.
19 . The method of claim 15 , wherein, when the number of TRS resources included in the CSI Resource Setting is K, O CPU =1 CPU or K CPUs are occupied for estimating and reporting K estimated Doppler shift(s), wherein K is a positive integer.
20 . The method of claim 15 , further comprising: receiving each of the TRS resource(s) transmitted with a frequency that has not been compensated by the Doppler shift.
21 . The method of claim 20 , further comprising: receiving demodulation reference signal (DM-RS) port(s) of signal frequency network physical downlink control channel (SFN-PDCCH) or signal frequency network physical downlink shared channel (SFN-PDSCH) transmitted with a frequency that has been compensated by the Doppler shift, wherein the DM-RS port(s) are Quasi Colocationed (QCLed) with the TRS resource(s) with Doppler spread, average delay, delay spread.
