Granted Patent B2

US 12,634,080 · App. 18/004,540 · Granted May 19, 2026

Inventors: Chenxi Hao (Beijing, CN); Yu Zhang (San Diego, CA); Chao Wei (Beijing, CN); Fang Yuan (Beijing, CN); Liangming Wu (Beijing, CN); Wanshi Chen (San Diego, CA); Hao Xu (Beijing, CN)

Assignee: QUALCOMM Incorporated

H04L5/0051H04L5/0057H04L5/0064

Abstract

Claims (48)

1 . A method of wireless communication performed by a user equipment (UE), the method comprising:

determining to transmit a channel state information (CSI) report based on measurement using at least one of a physical downlink control channel (PDSCH) or a demodulation reference signal (DMRS);

determining a reference resource for CSI feedback;

calculating a channel quality indicator (CQI) based on the reference resource; and

transmitting the CQI in the CSI report on an uplink resource, wherein the uplink resource is separated from a last symbol of the reference resource by at least a number of symbols defined by a CSI timeline, wherein the CSI timeline is determined based at least in part on a number of CSI processing unit (CPU) occupation or a number of a DMRS port.

2 . The method of claim 1 , wherein the reference resource is a slot on which the PDSCH or the DMRS is received.

3 . The method of claim 1 , wherein calculating the CQI based on the reference resource includes determining an overhead assumption for calculation of the CQI based on a slot on which the PDSCH and the DMRS are received.

4 . The method of claim 3 , wherein the overhead assumption comprises at least a number of symbols for control signaling, a number of DMRS symbols and PDSCH symbols, a number of additional DMRS symbols, and resources allocated for non-zero power (NZP) CSI reference signal (NZP-CSI-RS) and zero power (ZP) CSI-RS.

5 . The method of claim 1 , wherein calculating the CQI based on the reference resource includes determining that a CSI reporting band is equal to a frequency domain allocation of the PDSCH and the DMRS.

6 . The method of claim 5 , wherein the CSI report includes a wideband CSI.

7 . The method of claim 1 , wherein the CSI report includes a resource block group (RBG)-level CQI or physical resource group (PRG)-level CQI, wherein the RBG-level CQI or the PRG-level CQI includes the same resources as the DMRS and the PDSCH used for channel measurement or interference measurement.

8 . The method of claim 1 , wherein the CSI report includes an RBG-level CQI or an PRG-level CQI separately configured in a CSI report setting.

9 . The method of claim 1 , wherein a CSI processing unit (CPU) occupation time starts from a first symbol of an earliest one of the DMRS or the PDSCH used for channel measurement or interference measurement and ends at a last symbol of the uplink resource.

10 . The method of claim 1 , wherein a DMRS port for the DMRS and the PDSCH is active from a first symbol of the DMRS or the PDSCH used for channel measurement or interference measurement to a last symbol of the uplink resource.

11 . The method of claim 1 , wherein the uplink resource is separated from the last symbol of the reference resource by a greater of the number of symbols defined by the CSI timeline or a number of symbols defined by a hybrid automatic repeat request (HARQ) timeline when the CSI report is transmitted on a same slot as a HARQ ACK/NACK or in a same PUCCH as the HARQ ACK/NACK.

12 . The method of claim 1 , wherein determining to transmit the CSI report comprises:

determining a priority of the CSI report, wherein the priority of the CSI report is based at least in part on a type of a downlink measurement resource, whether the CSI report is triggered by the UE in response to a CSI measurement, or whether an aperiodic CSI is transmitted on a PUCCH; and

determining resource CSI multiplexing order, dropping order, or omission order based on the priority.

13 . The method of claim 12 , wherein determining the priority of the CSI report comprises determining a priority function, wherein a value of a factor in the priority function is defined by the type of the downlink measurement resource for the CSI report.

14 . The method of claim 12 , wherein determining the priority of the CSI report comprises determining a priority function, wherein a value of a factor in the priority function is defined by a trigger type of the CSI report.

15 . A method of wireless communication performed by a base station, the method comprising:

configuring a user equipment (UE) with a channel state information (CSI) report configuration including a downlink measurement resource including a physical downlink shared channel (PDSCH) or a demodulation reference signal (DMRS);

transmitting a downlink grant that schedules the PDSCH and the DMRS in a slot;

transmitting the PDSCH and the DMRS in the slot; and

receiving a CSI report including a channel quality indicator (CQI) based on the PDSCH or the DMRS from the UE on an uplink resource, wherein the uplink resource is separated from a last symbol of the PDSCH or the DMRS used for channel measurement or interference measurement by at least a number of symbols defined by a CSI timeline, wherein the CSI timeline is selected based at least in part on a number of CPU occupation or a number of a DMRS port.

16 . The method of claim 15 , wherein the CQI is based on an overhead assumption for the slot where the PDSCH and the DMRS are transmitted.

17 . The method of claim 16 , wherein the overhead assumption comprises at least a number of symbols for control signaling, a number of DMRS symbols and PDSCH symbols, a number of additional DMRS symbols, and resources allocated for non-zero power (NZP) CSI reference signal (NZP-CSI-RS) and zero power (ZP) CSI-RS.

18 . The method of claim 15 , wherein a CSI reporting band is equal to a frequency domain allocation of the PDSCH and the DMRS.

19 . The method of claim 18 , wherein the CSI report includes a wideband CSI.

20 . The method of claim 15 , wherein the CSI report includes a resource block group (RBG)-level CQI or a physical resource group (PRG)-level CQI, wherein the RBG-level CQI or the PRG-level CQI includes the same resources as the DMRS and the PDSCH used for channel measurement or interference measurement.

21 . The method of claim 15 , wherein the CSI report includes an RBG-level CQI or an PRG-level CQI separately configured in a CSI report setting.

22 . The method of claim 15 , wherein a CSI processing unit (CPU) occupation time starts from a first symbol of an earliest one of the DMRS or the PDSCH used for channel measurement or interference measurement and ends at a last symbol of the uplink resource.

23 . The method of claim 15 , wherein a DMRS port for the DMRS and the PDSCH is active from a first symbol of the DMRS or the PDSCH used for channel measurement or interference measurement to a last symbol of the uplink resource.

24 . The method of claim 15 , wherein the uplink resource is separated from a last symbol of the PDSCH or the DMRS used for channel measurement or interference measurement by a greater of the number of symbols defined by the CSI timeline or a number of symbols defined by a hybrid automatic repeat request (HARQ) timeline when the CSI report is transmitted on a same slot as a HARQ ACK/NACK or in a same PUCCH as the HARQ ACK/NACK.

25 . An apparatus for wireless communication, comprising:

a memory; and

one or more processors configured to cause the apparatus to:

determine to transmit a channel state information (CSI) report based on measurement using at least one of a physical downlink control channel (PDSCH) or a demodulation reference signal (DMRS);

determine a reference resource for CSI feedback, wherein the reference resource is a slot on which the PDSCH or the DMRS is received;

calculate a channel quality indicator (CQI) based on the reference resource; and

transmit the CQI in the CSI report on an uplink resource, wherein the uplink resource is separated from a last symbol of the reference resource by at least a number of symbols defined by a CSI timeline, wherein the CSI timeline is determined based at least in part on a number of CPU occupation or a number of a DMRS port.

26 . An apparatus for wireless communication, comprising:

a memory; and

one or more processors configured to cause the apparatus to:

configure a user equipment (UE) with a channel state information (CSI) report configuration including a downlink measurement resource including a physical downlink shared channel (PDSCH) or a demodulation reference signal (DMRS);

transmit a downlink grant that schedules the PDSCH and the DMRS in a slot;

transmit the PDSCH and the DMRS in the slot; and

receive a CSI report including a channel quality indicator (CQI) based on the PDSCH or the DMRS from the UE on an uplink resource, wherein the uplink resource is separated from a last symbol of the PDSCH or the DMRS used for channel measurement or interference measurement by at least a number of symbols defined by a CSI timeline, wherein the CSI timeline is selected based at least in part on a number of CPU occupation or a number of a DMRS port.

Assignments (1)

Continuity (1)

References Cited (16)