Frequency adjustment in wireless transmission and reception
Timing adjustments or frequency offsets that at least partially compensate for Doppler shift (e.g., due to distance of a satellite transmitter or relative speed of a terrestrial receiver) of a signal, physical channel, or resource during wireless transmission are configured. The characteristics compensated comprise one of resource element (RE) mapping, channel state information reference signal (CSI-RS) configuration, bandwidth part (BWP) configuration, or control resource set (CORESET) configuration. Information indicating the multiple configurations is transmitted from a base station (BS) to at least one user equipment (UE). The timing adjustments or frequency offsets are specifically configured for one UE, a group of UEs, or the UEs served by a single serving cell. Joint transmission from multiple cells/TRPs/spotbeams may involve partial/full subcarrier alignment.
1. A first transmission-reception point (TRP) for joint transmission or reception between multiple TRPs, the first TRP comprising:
a processor configured to apply one of a timing adjustment or a frequency offset between the TRPs for one or more of signals, channels, or resources; and
a transceiver operatively coupled to the processor and configured to
signal to a second TRP one of the applied timing adjustment or frequency offset value applied by the first TRP or a requested timing adjustment or frequency offset value requested to be applied by the second TRP,
signal to a user equipment (UE) a timing adjustment or frequency offset value to be applied by the UE for transmission or reception of the one or more of the signals, channels, or resources, and
transmit the one or more of the signals, channels, or resources jointly with the second TRP on one or more frequencies,
wherein signaling of timing adjustment values is in units of one of symbol duration, sampling time duration, or seconds, and signaling of frequency adjustment values is in units of one of subcarrier spacing or Hertz (Hz).
2. The first TRP of claim 1 , wherein the first and second TRPs are one of satellites or antennas corresponding to beams within a satellite.
3. The first TRP of claim 1 , wherein the one or more of the signals, channels, or resources correspond to one or more of
a physical downlink shared channel (PDSCH), a physical uplink shared channel (PUSCH), or another data channel, or
a physical downlink control channel (PDCCH), a physical uplink control channel (PUCCH), or another control channel,
wherein one of a plurality of TRPs configures the UE with one or multiple configurations of data or control channel resource element (RE) mapping(s) with a corresponding timing adjustment or frequency offset value,
wherein the one of the plurality of TRPs indicates to the UE which configuration to apply for transmission or reception of the one or more of the signals, channels, or resources, and
wherein the plurality of TRPs includes the first and second TRPs.
4. The first TRP of claim 1 , wherein the one or more of the signals, channels, or resources correspond to one of a channel state information reference signal (CSI-RS), a tracking reference signal (TRS), a demodulation reference signal (DMRS), a sounding reference signal (SRS), or another reference signal,
wherein, in case that the one or more of the signals, channels, or resources corresponds to the CSI-RS,
one of a plurality of TRPs configures the UE with one or multiple CSI processes with a corresponding CSI-RS resource configuration including the timing adjustment or frequency offset value to be applied by the UE,
the one of the plurality of TRPs periodically or aperiodically triggers the UE to measure the CSI-RS with an indicated configuration and to transmit a CSI measurement report, and
the plurality of TRPs includes the first and second TRPs.
5. The first TRP of claim 1 , wherein the one or more of the signals, channels, or resources correspond to a bandwidth part (BWP),
wherein one of a plurality of TRPs configures the UE with one or multiple BWP configurations with the timing adjustment or frequency offset value to be applied by the UE,
wherein the one of the plurality of TRPs indicates to the UE which configuration to apply for downlink (DL) or uplink (UL) BWP switching for transmission or reception, and
wherein the plurality of TRPs includes the first and second TRPs.
6. The first TRP of claim 1 , wherein the one or more of the signals, channels, or resources correspond to a control resource set (CORESET),
wherein one of a plurality of TRPs configures the UE with one or multiple CORESET configurations with the timing adjustment or frequency offset value to be applied by the UE, and
wherein the one of the plurality of TRPs indicates to the UE which configuration to apply for reception of downlink control information (DCI), and
wherein the plurality of TRPs includes the first and second TRPs.
7. The first TRP of claim 1 , wherein the first TRP signals a time/frequency resource scheduled for the joint transmission or reception and the timing adjustment or frequency offset value applied by the first TRP for the joint transmission or reception to the second TRP, wherein the second TRP determines a required amount of timing adjustment or frequency offset to align a transmission or reception by the second TRP with the joint transmission or reception by the first TRP, and wherein the first TRP and one or multiple of other TPRs including the second TRP jointly transmit or receive the one or more of the signals, channels, or resources to or from one or multiple UEs including the UE.
8. The first TRP of claim 7 , wherein the second TRP at least one of
determines the timing adjustment or frequency offset applied by the second TRP such that the one or more of the signals, channels, or resources jointly transmitted by the first and second TRPs are received in time or frequency alignment at one or multiple UEs including the UE,
partially or fully overlaps a joint transmission or reception in time or frequency with the first TRP, or
signals a transmission power level over partially or fully overlapped time and/or frequency resource,
wherein the first TRP determines a transmission power level according to the signaling from one or multiple other TRPs including the second TRP.
9. The first TRP of claim 7 , wherein a transmission power level determination by the UE is performed to evenly distribute a reception power level at the UE over scheduled time/frequency resource(s).
10. A user equipment (UE) configured for joint transmission or reception with multiple transmission-reception points (TRPs), the UE comprising:
a transceiver configured to
receive a timing adjustment or frequency offset value to be applied for transmission or reception of one or more of signals, channels, or resources transmitted by a first TRP jointly with a second TRP, and
receive the one or more of the signals, channels, or resources from the first TRP and the second TRP on one or more frequencies; and
a processor configured to apply one of the timing adjustment or frequency offset to the received one or more of the signals, channels, or resources,
wherein signaling of timing adjustment values is in units of one of symbol duration, sampling time duration, or seconds, and signaling of frequency adjustment values is in units of one of subcarrier spacing or Hertz (Hz).
11. The UE of claim 10 , wherein the one or more of the signals, channels, or resources correspond to one or more of
a physical downlink shared channel (PDSCH), a physical uplink shared channel (PUSCH), or another data channel, or
a physical downlink control channel (PDCCH), a physical uplink control channel (PUCCH), or another control channel,
wherein the UE is configured with one or multiple configurations of data or control channel resource element (RE) mapping(s) with a corresponding timing adjustment or frequency offset value to be applied by the UE, and
wherein the UE is indicated on which configuration to apply for transmission or reception of the one or more of the signals, channels, or resources.
12. The UE of claim 10 , wherein the one or more of the signals, channels, or resources correspond to one of a channel state information reference signal (CSI-RS), a tracking reference signal (TRS), a demodulation reference signal (DMRS), a sounding reference signal (SRS), or another reference signal,
wherein, in case that the one or more of the signals, channels, or resources corresponds to the CSI-RS,
the UE is configured with one or multiple CSI processes with a corresponding CSI-RS resource configuration including the timing adjustment or frequency offset value, and
the UE is periodically or aperiodically triggered to measure the CSI-RS with an indicated configuration and to transmit a CSI measurement report.
13. The UE of claim 10 , wherein the one or more of the signals, channels, or resources correspond to a bandwidth part (BWP),
wherein the UE is configured with one or multiple BWP configurations with a corresponding timing adjustment or frequency offset value to be applied by the UE, and
wherein the UE is indicated on which configuration to apply for downlink (DL) or uplink (UL) BWP switching for transmission or reception.
14. The UE of claim 10 , wherein the one or more of the signals, channels, or resources correspond to a control resource set (CORESET),
wherein the UE is configured with one or multiple CORESET configurations with a corresponding timing adjustment or frequency offset value to be applied by the UE, and
wherein the UE is indicated on which configuration to apply for reception of downlink control information (DCI).
15. A method performed by a first transmission-reception point (TRP) configured for of joint transmission or reception between multiple TRPs, the method comprising:
applying one of a timing adjustment or a frequency offset between the TRPs for one or more of signals, channels, or resources;
signaling to a second TRP one of the applied timing adjustment or frequency offset value applied by the first TRP or a requested timing adjustment or frequency offset value requested to be applied by the second TRP;
signaling to a user equipment (UE) a timing adjustment or frequency offset value to be applied by the UE for transmission or reception of the one or more of the signals, channels, or resources; and
transmitting the one or more of the signals, channels, or resources jointly with the second TRP on one or more frequencies,
wherein signaling of timing adjustment values is in units of one of symbol duration, sampling time duration, or seconds, and signaling of frequency adjustment values is in units of one of subcarrier spacing or Hertz (Hz).
16. The method of claim 15 , wherein the one or more of the signals, channels, or resources correspond to one or more of
a physical downlink shared channel (PDSCH), a physical uplink shared channel (PUSCH), or another data channel, or
a physical downlink control channel (PDCCH), a physical uplink control channel (PUCCH), or another control channel,
wherein one of a plurality of TRPs configures the UE with one or multiple configurations of data or control channel resource element (RE) mapping(s) with a corresponding timing adjustment or frequency offset value,
wherein the one of the plurality of TRPs indicates to the UE which configuration to apply for transmission or reception of the one or more of the signals, channels, or resources, and
wherein the plurality of TRPs includes the first and second TRPs.
17. The method of claim 15 , wherein the one or more of the signals, channels, or resources correspond to one of a channel state information reference signal (CSI-RS), a tracking reference signal (TRS), a demodulation reference signal (DMRS), a sounding reference signal (SRS), or another reference signal,
wherein, in case that the one or more of the signals, channels, or resources corresponds to the CSI-RS,
one of a plurality of TRPs configures the UE with one or multiple CSI processes with a corresponding CSI-RS resource configuration including the timing adjustment or frequency offset value to be applied by the UE,
the one of the plurality of TRPs periodically or aperiodically triggers the UE to measure the CSI-RS with an indicated configuration and to transmit a CSI measurement report, and
the plurality of TRPs includes the first and second TRPs.
18. The method of claim 15 , wherein the one or more of the signals, channels, or resources correspond to a bandwidth part (BWP),
wherein one of a plurality of TRPs configures the UE with one or multiple BWP configurations with the timing adjustment or frequency offset value to be applied by the UE,
wherein the one of the plurality of TRPs indicates to the UE which configuration to apply for downlink (DL) or uplink (UL) BWP switching for transmission or reception, and
wherein the plurality of TRPs includes the first and second TRPs.
19. The method of claim 15 , wherein the one or more of the signals, channels, or resources correspond to a control resource set (CORESET),
wherein one of a plurality of TRPs configures the UE with one or multiple CORESET configurations with the timing adjustment or frequency offset value to be applied by the UE,
wherein the one of the plurality of TRPs indicates to the UE which configuration to apply for reception of downlink control information (DCI), and
wherein the plurality of TRPs includes the first and second TRPs.
20. The method of claim 15 , wherein the first TRP signals a time/frequency resource scheduled for the joint transmission or reception and the timing adjustment or frequency offset value applied by the first TRP for the joint transmission or reception to the second TRP,
wherein the second TRP determines a required amount of timing adjustment or frequency offset to align a transmission or reception by the second TRP with the joint transmission or reception by the first TRP, and
wherein the first TRP and one or multiple of other TPRs including the second TRP jointly transmit or receive the one or more of the signals, channels, or resources to or from one or multiple UEs including the UE.