Systems and Methods for Reference Signals and CSI Feedback

• US 20180262938A1
• Filed: 05/14/2018
• Published: 09/13/2018
• Est. Priority Date: 03/16/2012
• Status: Active Grant

• Current Assignee: Futurewei Technologies Incorporated (Huawei Investment & Holding Co., Ltd.)
• Original Assignee: Futurewei Technologies Incorporated (Huawei Investment & Holding Co., Ltd.)
• Inventors: Liu, Jialing, Xiao, Weimin
• Granted Patent: US 10,750,396 B2
• Time in Patent Office: Days
• CPC Class Codes: H04B 7/0619 using feedback from receiving side feedback signaling for adaptive modulation/coding H04L1/0001
• CPC Class Codes: H04B 7/0626 Channel coefficients, e.g. channel state information [CSI]
• CPC Class Codes: H04B 7/0632 Channel quality parameters, e.g. channel quality indicator [CQI]
• CPC Class Codes: H04L 5/0048 Allocation of pilot signals, i.e. of signals known to the receiver
• CPC Class Codes: H04L 5/0057 Physical resource allocation for CQI
• CPC Class Codes: H04L 5/0073 Allocation arrangements that take into account other cell interferences for intercell interference mitigation or co-ordination in orthogonal multiplex systems H04J11/005
• CPC Class Codes: H04W 24/10 Scheduling measurement reports ; Arrangements for measurement reports

Abstract

System and method embodiments are provided for signaling reference signals and Channel State Information (CSI) feedback for wireless communications. An embodiment method implemented by a user equipment (UE) for wireless communications measurements and CSI feedback includes receiving, from a network, at least one of a first index that indicates a corresponding non-zero-power CSI reference signal (CSI-RS) resource, a second index that indicates a corresponding zero-power CSI-RS resource, a third index that indicates a corresponding CSI-RS resource for interference measurement, and a fourth index that indicates a corresponding channel quality indicator (CQI) report configuration. The method also includes receiving, from the network, at least one of a fifth index that indicates a corresponding periodic CQI report in accordance with the CQI report configuration indicated by the fourth index, and a sixth index that indicates a corresponding aperiodic CQI report in accordance with the CQI report configuration indicated by the fourth index.

Claims

1. A method, by a user equipment (UE) for wireless communications, the method comprising:

receiving, from a network, a first set of first indexes that each indicates a corresponding non-zero-power CSI reference signal (CSI-RS) resource, a second set of second indexes that each indicates a corresponding zero-power CSI-RS resource, a third set of third indexes that each indicates a corresponding CSI interference measurement (CSI-IM) resource, and a fourth set of fourth indexes that each indicates a corresponding report configuration;

performing an interference measurement according to at least one report configuration of the report configurations indicated by the fourth set of indexes, wherein the at least one report configuration is associated with;

in response to a channel measurement resource and an interference measurement resource being configured for the at least one report configuration by the network, at least one of a subset of the non-zero-power CSI-RS resources indicated by the first indexes and a subset of the CSI-IM resources indicated by the third indexes; and

in response to only the channel measurement resource being configured for the at least one report configuration by the network, only a subset of the non-zero-power CSI-RS resources indicated by the first indexes; and

reporting a CSI to the network according to the interference measurement.

2. The method of claim 1 further comprising:

performing rate matching around resource elements (REs) associated with the non-zero-power CSI-RS resource corresponding to the first indexes for physical downlink shared channel (PDSCH) demodulation.

3. The method of claim 1 further comprising:

performing rate matching around resource elements (REs) associated with the zero-power CSI-RS resource corresponding to the second indexes for physical downlink shared channel (PDSCH) demodulation.

4. The method of claim 1, wherein the UE receives a signaling that includes, for the report configurations corresponding to the fourth indexes, the first indexes to configure the non-zero-power CSI-RS resource corresponding to the indicated first indexes as one of a signal or channel measurement resource and an interference measurement resource associated with the respective report configuration.

5. The method of claim 1, wherein the UE receives a signaling that includes, for the report configurations corresponding to the fourth indexes, the third indexes to configure the CSI-RS resource corresponding to the indicated third indexes as an interference measurement resource associated with the respective report configuration.

6. The method of claim 1, wherein the non-zero-power CSI-RS resource, the zero-power CSI-RS resource, the CSI-IM resource, and the report configuration are selected by the network from a maximum number of non-zero-power CSI-RS resources, a maximum number of zero-power CSI-RS resources, a maximum number of CSI-IM resources, and a maximum number of report configurations that are specified for the UE or according to a communications protocol of the network.

7. The method of claim 1, wherein the indicated non-zero-power CSI-RS resource is associated with one or more P_c ratio values.

8. The method of claim 7 further comprising deriving, using the indicated non-zero-power CSI-RS resource, one or more CQI reports assuming each of the one or more P_c ratio values, according to one or more CQI report configurations corresponding to one or more values of the fourth indexes.

9. The method of claim 1 further comprising:

receiving, from a network, a sixth set of sixth indexes that each indicates a corresponding aperiodic CSI report in accordance with the report configurations indicated by the fourth indexes.

10. The method of claim 9, wherein the sixth indexes indicating the corresponding aperiodic CSI reports have values from a plurality of values for the sixth indexes indicating corresponding aperiodic CSI reports, and wherein a maximum number of the values for the sixth indexes is specified for the UE.

11. The method of claim 10, wherein the maximum number of the values for the sixth indexes is equal to three.

12. The method of claim 1, wherein each configured value of the first indexes is different from any other configured value of the first indexes at the same time, each configured value of the second indexes is different from any other configured value of the second indexes at the same time, each configured value of the third indexes is different from any other configured value of the third indexes at the same time, and each configured value of the fourth indexes is different from any other configured value of the fourth indexes at the same time.

13. The method of claim 1, wherein the UE receives a signaling that indicates the first indexes to specify that the non-zero-power CSI-RS resources corresponding to the indicated first indexes are released.

14. The method of claim 1, wherein the UE receives a signaling that indicates a value of the second indexes for specifying that the zero-power CSI-RS resources corresponding to the indicated second indexes are released.

15. The method of claim 1, wherein the UE receives a signaling that indicates a value of the third indexes for specifying that the CSI-RS resource corresponding to the indicated third indexes are released.

16. The method of claim 1, wherein the UE receives a signaling that indicates a value of the fourth indexes for specifying that the corresponding report configurations corresponding to the indicated fourth indexes are released.

17. The method of claim 1, wherein the corresponding CSI-RS resources, the corresponding report configurations, or both are associated with corresponding pre-defined index values according to an ordering of signaled resources or configurations.

18. The method of claim 1, wherein the corresponding CSI-RS resources, the corresponding report configurations, or both are assigned with corresponding indexes.

19. The method of claim 1, further comprising:

performing a channel quality measurement; and

sending, by the UE, channel quality feedback in accordance with the received first, second, third and fourth indexes and the channel quality measurement.

20. The method of claim 1, wherein the first, second, third, and fourth indexes are different from each other.

21. A method, by a user equipment (UE) for wireless communications, the method comprising:

receiving, from a network, a fourth set of fourth indexes that each indicates a corresponding report configuration, at least one report configuration indicating a first index of a non-zero-power channel-state information (CSI) reference signal (CSI-RS) resource configured by the network and a second index of a CSI interference measurement (CSI-IM) resource configured by the network; and

receiving, from the network, a fifth set of fifth indexes that each indicates a corresponding periodic report in accordance with the report configurations indicated by the fourth indexes, the corresponding periodic report associated with the first index and the second index.

22. The method of claim 21 further comprising:

sending for a subframe to the network, a CSI report of a report configuration with a lowest value for the fourth indexes, in case of collision between CSI reports of the same serving cell with Physical Uplink Control Channel (PUCCH) reporting type of the same priority, and the CSI reports corresponding to different report configurations with different values of the fourth indexes; and

dropping CSI for all other report configurations.

23. The method of claim 21 further comprising:

sending for a subframe to the network, a CSI report of a serving cell with a lowest value of ServCellIndex, in case of collision between CSI reports of different serving cells with Physical Uplink Control Channel (PUCCH) reporting type of the same priority, and the CSI reports corresponding to CQI report configurations with the same value of the fourth indexes; and

dropping CSI for all other serving cells.

24. The method of claim 21 further comprising:

sending for a subframe to the network, a CSI report of a report configuration with a lowest value of the fourth indexes and of a serving cell with a report configuration with the lowest value of the fourth indexes, in case of collision between CSI reports of different serving cells with Physical Uplink Control Channel (PUCCH) reporting type of the same priority, and the CSI reports corresponding to report configurations with different values of the fourth indexes; and

dropping CSI for all other serving cells and report configurations with all other values of the fourth indexes.

25. A method, by a user equipment (UE) for wireless communications, the method comprising:

receiving, from a network, a fourth set of fourth indexes that each indicates a corresponding report configuration, at least one report configuration indicating a first index of a non-zero-power channel-state information (CSI) reference signal (CSI-RS) resource configured by the network and a second index of a CSI interference measurement (CSI-IM) resource configured by the network;

receiving, from the network, a sixth set of sixth indexes that each indicates a corresponding aperiodic report in accordance with the report configurations indicated by the fourth indexes, the corresponding aperiodic report associated with the first index and the second index; and

sending for a subframe to the network, upon receiving a triggering signaling indicating one of the sixth index, a CSI associated with the indicated sixth index indicating the corresponding aperiodic report associated with the indicated sixth index in accordance with the report configuration associated with the indicated sixth index.

26. A method, by a network component for configuring a user equipment (UE) for wireless communications, the method comprising:

transmitting, to the UE, a first set of first indexes that each indicates a corresponding non-zero-power CSI reference signal (CSI-RS) resource, a second set of second indexes that each indicates a corresponding zero-power CSI-RS resource, a third set of third indexes that each indicates a corresponding CSI interference measurement (CSI-IM) resource, and a fourth set of fourth indexes that each indicates a corresponding report configuration;

configuring a channel measurement resource and an interference measurement resource for the UE, wherein at least one report configuration of the report configurations indicated by the fourth set of indexes is associated with a subset of the non-zero-power CSI-RS resources indicated by the first indexes and a subset of the CSI-IM resources indicated by the third indexes; and

receiving a CSI from the UE.

27. The method of claim 26, wherein a CSI-RS resource, a CQI report, or both is associated with a corresponding pre-defined index value or order of resources or reports.

28. The method of claim 26, wherein a CSI-RS resource, a CQI report, or both is associated with a corresponding index value, bit, or bitmap.

29. The method of claim 26, wherein the non-zero-power CSI-RS resource, the zero-power CSI-RS resource, the CSI-RS resource for interference measurement, and a CQI report are selected by the network from a maximum number of non-zero-power CSI-RS resources, a maximum number of zero-power CSI-RS resources, a maximum number of CSI-RS resources for interference measurements, and a maximum number of CQI reports that are predetermined for the UE.

30. The method of claim 26, wherein the indicated non-zero-power CSI-RS resource is signaled with one or more allowable P_c ratio values.

31. A user equipment (UE) for wireless communications, the UE comprising:

a processor; and

a non-transitory computer readable storage medium storing programming for execution by the processor, the programming including instructions to;

receive, from a network, a first set of first indexes that each indicates a corresponding non-zero-power CSI reference signal (CSI-RS) resource, a second set of second indexes that each indicates a corresponding zero-power CSI-RS resource, a third set of third indexes that each indicates a corresponding CSI interference measurement (CSI-IM) resource, and a fourth set of fourth indexes that each indicates a corresponding report configuration;

perform an interference measurement according to at least one report configuration of the report configurations indicated by the fourth set of indexes, wherein the at least one report configuration is associated with;

in response to a channel measurement resource and an interference measurement resource being configured for the at least one report configuration by the network, at least one of a subset of the non-zero-power CSI-RS resources indicated by the first indexes and a subset of the CSI-IM resources indicated by the third indexes; and

in response to only the channel measurement resource being configured for the at least one report configuration by the network, only a subset of the non-zero-power CSI-RS resources indicated by the first indexes; and

report a CSI to the network according to the interference measurement.

32. The UE of claim 31, wherein a CSI-RS resource, a CQI report, or both is associated with a corresponding pre-defined index value or order of resources or reports.

33. The UE of claim 31, wherein a CSI-RS resource, a CQI report, or both is associated with a corresponding index value, bit, or bitmap.

34. A network component for configuring a user equipment (UE) for wireless communications, the network component comprising:

a processor; and

a non-transitory computer readable storage medium storing programming for execution by the processor, the programming including instructions to;

transmit, to the UE, a first set of first indexes that each indicates a corresponding non-zero-power CSI reference signal (CSI-RS) resource, a second set of second indexes that each indicates a corresponding zero-power CSI-RS resource, a third set of third indexes that each indicates a corresponding CSI interference measurement (CSI-IM) resource, and a fourth set of fourth indexes that each indicates a corresponding report configuration;

configure a channel measurement resource and an interference measurement resource for the UE, wherein at least one report configuration of the report configurations indicated by the fourth set of indexes is associated with a subset of the non-zero-power CSI-RS resources indicated by the first indexes and a subset of the CSI-IM resources indicated by the third indexes; and

receive a CSI from the UE.

35. The network component of claim 34, wherein a CSI-RS resource, a CQI report, or both is associated with a corresponding pre-defined index value or order of resources or reports.

36. The network component of claim 34, wherein a CSI-RS resource, a CQI report, or both is associated with a corresponding index value, bit, or bitmap.

37. The network component of claim 34, wherein the non-zero-power CSI-RS resource, the zero-power CSI-RS resource, the CSI-RS resource for interference measurement, and a CQI report are selected by a network from a maximum number of non-zero-power CSI-RS resources, a maximum number of zero-power CSI-RS resources, a maximum number of CSI-RS resources for interference measurements, and a maximum number of CQI report configurations that are specified for the UE.