Framework and signaling for dynamic noncoherent joint transmission (NC-JT) channel state information (CSI) hypothesis indication

1 . A method in a network node configured to communicate with a wireless device, WD, the method comprising:

transmitting a first indication indicating to the WD a set of channel measurement resources, CMRs, to use for determining channel state information, CSI, the CSI including at least one of (i) a first CSI for multiple transmission and reception point, multi-TRP, physical downlink shared channel, PDSCH, transmission, and (ii) at least one second CSI for PDSCH transmission from one TRP;

transmitting a second indication indicating to the WD a first subset of CMRs for non-coherent joint transmission, NC-JT, CSI measurement hypotheses from the set of CMRs to use for determining the first CSI;

indicating that at least one channel measurement resource, CMR, of the first subset of CMRs used for NC-JT CSI measurement hypotheses is to be reused in a second subset of CMRs used for single-TRP measurement hypotheses;

and

receiving a CSI report comprising at least one of the first CSI and the at least one second CSI.

2 . The method of claim 1 , wherein the second indication is a radio resource control, RRC, parameter that is included in a CSI-ReportConfig information element, IE.

3 . The method of claim, 2 , wherein, when the RRC parameter is not configured to the WD, the CMRs of the first subset of CMRs are not reusable in the second subset of CMRs.

4 . The method of claim 2 , wherein, when the RRC parameter is configured, the CMRs of the first subset are reusable in the second subset of CMRs.

5 . The method of claim 2 , wherein, when the RRC parameter is not configured, the CMRs in the first subset are not reusable in the second subset of CMRs.

6 . The method of claim 1 , wherein the second subset of CMRs partially overlaps with the first subset of CMRs.

7 . The method of claim 1 , wherein configuring the WD includes indicating that only CMRs from the first subset of CMRs are to be used in the second subset of CMRs.

8 . The method of claim 1 , wherein the second indication explicitly indicates the first subset of CMRs, the explicit indication including indication of pairs of non-zero power, NZP, CSI reference signal resource IDs.

9 . The method of method of claim 1 , wherein the second indication indicates the first subset of CMRs via a downlink control information, DCI, message.

10 . The method of claim 9 , wherein the first subset of CMRs is indicated in a CSI-AssociatedReportConfigInfo information element triggered by a CSI Request field in the DCI message.

11 . The method of claim 1 , wherein the second indication includes indicating the first subset of CMRs via a medium access control control element, MAC CE, message.

12 . A method in a wireless device, WD, configured to communicate with a network node, the method comprising:

receiving a first indication of a set of channel measurement resources, CMRs, to use for determining channel state information, CSI, the CSI including at least one of (i) a first CSI for multiple transmission and reception point, multi-TRP, physical downlink shared channel, PDSCH, transmission, and (ii) at least one second CSI for PDSCH transmission from one TRP;

receiving a second indication of a first subset of CMRs for non-coherent joint transmission, NC-JT, CSI measurement hypotheses from the set of CMRs to use for determining the first CSI;

the WD is indicated or configured that at least one CMR of the first subset of CMRs used for NC-JT CSI measurement hypotheses is to be reused in a second subset of CMRs used for single-TRP measurement hypotheses;

determining the at least one second CSI using the second subset of CMRs used for single-TRP measurement hypotheses from the set of CMRs; and

transmitting a CSI report comprising at least one of the first CSI and the at least one second CSI.

13 . The method of claim 12 , wherein the second indication is a radio resource control, RRC, parameter that is included in a CSI-ReportConfig information element, IE.

14 . The method of claim 13 , wherein, when the RRC parameter is not configured to the WD, the CMRs of the first subset of CMRs are not reusable in the second subset of CMRs.

15 . The method of claim 13 , wherein, when the RRC parameter is configured, the CMRs of the first subset of CMRs are reusable in the second subset of CMRs.

16 . The method of claim 13 , wherein, when the RRC parameter is not configured, the CMRs in the first subset of CMRs are not reusable in the second subset of CMRs.

17 . The method of claim 12 , wherein at least one CMR of the first subset of CMRs is to be reused in the second subset of CMRs.

18 . The method of claim 12 , wherein the second subset of CMRs partially overlaps with the first subset of CMRs.

19 . The method of claim 12 , wherein only CMRs from the first subset of CMRs are used in the second subset of CMRs.

20 . A WD configured to communicate with a network node, the WD comprising:

a radio interface configured to cause the WD to:

receive a first indication of a set of channel measurement resources, CMRs, to use for determining channel state information, CSI, the CSI including at least one of (i) a first CSI for multiple transmission and reception point, multi-TRP, physical downlink shared channel, PDSCH, transmission, and (ii) at least one second CSI for PDSCH transmission from one TRP; and

receive a second indication of a first subset of for non-coherent joint transmission, NC-JT, CSI measurement hypotheses from the set of CMRs to use for determining the first CSI;

the WD being indicated or configured that at least one CMR of the first subset of CMRs used for NC-JT CSI measurement hypotheses is to be reused in a second subset of CMRs used for single-TRP measurement hypotheses; and

determining the at least one second CSI using the second subset of CMRs used for single-TRP measurement hypotheses from the set of CMRs; and

transmit a CSI report comprising at least one of the first CSI and the at least one second CSI.