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US 11,463,999 B2Granted
Aperiodic CSI reference signals (CSI-RS) with aperiodic report triggering
AssigneeApple Inc.
InventorsAlexei Davydov, Vadim Sergeyev, Gregory Morozov, Ilya Bolotin
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Abstract
Dynamic transmission of non-zero power channel state information resource signals and interference measurement resources is described. Such dynamic transmission reduces or eliminates a need to buffer and store channel and interference measurements The described approach also reduces the overhead due to transmission of those resources and enables flexible time-domain channel state information requests.
Claims20
An apparatus, comprising:
- at least one processor configured to cause a user equipment (UE) to:
- receive radio-resource control (RRC) signaling, the RRC signaling including channel state information (CSI) configuration information indicating non-zero power CSI reference signal (NZP-CSI-RS) resources for channel measurements and CSI interference measurement (CSI-IM) resources for interference measurements, wherein the NZP CSI-RS and CSI-IM resources are aperiodic;
- receive downlink control information (DCI) that includes a CSI request and an uplink grant
- wherein a time domain location is indicated by the CSI request in the DCI
- perform the channel measurements using the NZP-CSI-RS resources at the time domain location;
- perform the interference measurements using the CSI-IM resources at the time domain location;
- and
- transmit an aperiodic CSI report, based on the channel measurements and the interference measurements and in accordance with the DCI, on a physical uplink shared channel (PUSCH), wherein the aperiodic CSI report corresponds to the NZP-CSI-RS resources and CSI-IM resources at the time domain location.
5 more elements
A user equipment (UE), comprising:
- wireless communication circuitry;
- and
- at least one processor communicatively coupled to the wireless communication circuitry and configured to cause the UE to:
- radio-resource control (RRC) signaling, the RRC signaling including channel state information (CSI) configuration information indicating non-zero power CSI reference signal (NZP-CSI-RS) resources for channel measurements and CSI interference measurement (CSI-IM) resources for interference measurements, wherein the NZP CSI-RS and CSI-IM resources are aperiodic;
- receive downlink control information (DCI) that includes a CSI request and an uplink grant
- wherein a time domain location is indicated by the CSI request in the DCI;
- perform the channel measurements using the NZP-CSI-RS resources at the time domain location;
- perform the interference measurements using the CSI-IM resources at the time domain location;
- and
- transmit an aperiodic CSI report, based on the channel measurements and the interference measurements and in accordance with the DCI, for transmission carried on a physical uplink shared channel (PUSCH), wherein the aperiodic CSI report corresponds to the NZP-CSI-RS resources and CSI-IM resources at the time domain location.
7 more elements
An apparatus of a base station (BS), the apparatus comprising:
- memory;
- and
- one or more processors, wherein the one or more processors are configured to:
- transmit radio-resource control (RRC) signaling to a user equipment (UE), the RRC signaling including channel state information (CSI) configuration information indicating non-zero power CSI reference signal (NZP-CSI-RS) resources for channel measurements and CSI interference measurement (CSI-IM) resources for interference measurements, wherein the NZP CSI-RS and CSI-IM resources are aperiodic;
- transmit downlink control information (DCI) that includes a CSI request and an uplink grant, wherein a time domain location for measurement of the NZP-CSI-RS resources and the CSI-IM resources is indicated by the CSI request in the DCI;
- and
- receive an aperiodic CSI report from the UE, based on the channel measurements and the interference measurements and in accordance with the DCI, on a physical uplink shared channel (PUSCH), wherein the aperiodic CSI report corresponds to the NZP-CSI-RS resources and CSI-IM resources at the time domain location.
4 more elements
Dependencies are inferred from the claim text.