User equipment and base station configured for aperiodic CSI references signals(CSI-RS) with aperiodic report triggering

1. An apparatus of a user equipment (UE), the apparatus comprising:

one or more processors; and

memory;

wherein the one or more processors are configured to:

decode radio-resource control (RRC) signalling, the RRC signalling including channel state information (CSI) measurement configuration information indicating non-zero power CSI reference signal (NZP-CSI-RS) resources for channel measurement and CSI interference measurement (CSI-IM) resources for interference measurement, the RRC signalling further indicating an offset;

configure the UE for use of aperiodic CSI reference signals (CSI-RS) with aperiodic report triggering in response to the CSI measurement configuration information;

decode downlink control information (DCI) that includes a CSI request and an uplink grant;

trigger CSI reporting in response to the CSI request;

configure the UE to use CSI-RS resources in a portion of a subframe relative to the DCI based on the offset, wherein the configuration causes the UE to use the NZP-CSI-RS resources, in the portion of the subframe, for channel measurement, and to use the CSI interference measurement (CSI-IM) resources, in the portion of the subframe, for interference measurement, wherein the configuration further causes the UE to use the CSI-RS resources in a slot of a subframe, the slot being offset from the DCI based on the offset; and

encode an aperiodic CSI report, based on the measurements, in accordance with the uplink grant received in the DCI, for transmission carried on a physical uplink shared channel (PUSCH), wherein the memory is configured to store the aperiodic CSI report.

2. The apparatus of claim 1 , wherein the subframe containing the CSI-RS resources is no earlier than four subframes before the aperiodic CSI report is transmitted.

3. The apparatus of claim 1 , wherein the RRC signalling further indicates that the NZP CSI-RS and CSI-IM resources do not have a preconfigured subframe periodicity.

4. The apparatus of claim 1 , wherein the uplink grant is received in a random-access response (RAR).

5. The apparatus of claim 1 , wherein the one or more processors are further configured to configure the UE for transmission mode 10 .

6. The apparatus of claim 5 , wherein, when configured for transmission mode 10 , the UE is further configured to decode an indication of one or more CSI processes for CSI reporting for transmission mode 10 , the indicated one or more CSI processes including one or more NZP CSI-RS resources and one or more CSI-IM resources.

7. The apparatus of claim 1 , further comprising transceiver circuitry.

8. The apparatus of claim 7 , further comprising two or more antennas coupled to the transceiver circuitry.

9. A non-transitory computer-readable storage medium that stores instructions, wherein the instructions, when executed by one or more processors of a user equipment (UE), configure the UE to:

decode radio-resource control (RRC) signalling, the RRC signalling including channel state information (CSI) measurement configuration information indicating non-zero power CSI reference signal (NZP-CSI-RS) resources for channel measurement and CSI interference measurement (CSI-IM) resources for interference measurement, the RRC signalling further indicating an offset;

configure the UE for use of aperiodic CSI reference signals (CSI-RS) with aperiodic report triggering in response to the CSI measurement configuration information;

decode downlink control information (DCI) that includes a CSI request and an uplink grant;

trigger CSI reporting in response to the CSI request;

configure the UE to use CSI-RS resources in a portion of a subframe relative to the DCI based on the offset, wherein the configuration causes the UE to use the NZP-CSI-RS resources, in the portion of the subframe, for channel measurement, and to use the CSI interference measurement (CSI-IM) resources, in the portion of the subframe, for interference measurement, wherein the configuration further causes the UE to use the CSI-RS resources in a slot of a subframe, the slot being offset from the DCI based on the offset; and

encode an aperiodic CSI report, based on the measurements, in accordance with the uplink grant received in the DCI, for transmission carried on a physical uplink shared channel (PUSCH).

10. The computer-readable storage medium of claim 9 , wherein the subframe containing the CSI-RS resources is no earlier than four subframes before the aperiodic CSI report is transmitted.

11. The computer-readable storage medium of claim 9 , wherein the RRC signaling further indicates that the NZP CSI-RS and CSI-IM resources do not have a preconfigured subframe periodicity.

12. The computer-readable storage medium of claim 9 , wherein the uplink grant is received in a random-access response (RAR).

13. The computer-readable storage medium of claim 9 , wherein the instructions, when executed by the one or more processors, further configure the UE for transmission mode 10 , wherein, when configured for transmission mode 10 , the UE is further configured to decode an indication of one or more CSI processes for CSI reporting for transmission mode 10 , the indicated one or more CSI processes including one or more NZP CSI-RS resources and one or more CSI-IM resources.

14. A non-transitory computer-readable storage medium that stores instructions for execution by one or more processors of node B (NB) to perform operations to configure the NB to:

encode radio-resource control (RRC) signalling for transmission to a user equipment (UE), the RRC signalling including channel state information (CSI) measurement configuration information, the RRC signalling to configure the UE for use of aperiodic CSI reference signals (CSI-RS) with aperiodic report triggering in response to the CSI measurement configuration information, the RRC signalling indicating non-zero power CSI reference signal (NZP-CSI-RS) resources for channel measurement and CSI interference measurement (CSI-IM) resources for interference measurement, the RRC signalling further indicating a triggering offset;

encode downlink control information (DCI), for transmission to the UE, the DCI to include a CSI request and an uplink grant, the CSI request to trigger CSI reporting by the UE, wherein the DCI is to configure the UE to use CSI-RS resources in a portion of a subframe relative to the DCI as indicated by the triggering offset, wherein the DCI is to further configure the UE to use the CSI-RS resources in a slot of a subframe, the slot being offset from the DCI based on the triggering offset; and

decode an aperiodic CSI report received from the UE, the aperiodic CSI report including measurements from the UE, the aperiodic CSI report received in accordance with the uplink grant indicated in the DCI, the aperiodic CSI report received on a physical uplink shared channel (PUSCH).

15. The apparatus of claim 1 , wherein time domain location of the NZP-CSI-RS resources and CSI-IM resources are dynamically determined by the CSI request.

16. The apparatus of claim 1 , wherein the CSI-RS resources are in a CSI reference resource.

17. The computer-readable storage medium of claim 9 , wherein time domain location of the NZP-CSI-RS resources and CSI-IM resources are dynamically determined by the CSI request.

18. The computer-readable storage medium of claim 14 , wherein time domain location of the NZP-CSI-RS resources and CSI-IM resources are dynamically determined by the CSI request.

19. The computer-readable storage medium of claim 14 , wherein the subframe containing the CSI-RS resources is no earlier than four subframes before the aperiodic CSI report is transmitted.

20. The computer-readable storage medium of claim 14 , wherein the RRC signalling further indicates that the NZP CSI-RS and CSI-IM resources do not have a preconfigured subframe periodicity.