IP Library › Granted Patent US 12671550
Granted Patent B2
US 12671550 · App. 18/306,377 · Granted Jun 30, 2026

Overhead reduction for coherent joint transmission (CJT) channel state information (CSI) feedback

Inventors: Kiran Venugopal (Green Brook, NJ); Wooseok Nam (San Diego, CA); Tao Luo (San Diego, CA)
Assignee: QUALCOMM Incorporated
H04L5/0051H04B7/0626H04L5/0035
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Quick Facts
Patent No.
US 12671550
App. No.
18/306,377
Granted
Jun 30, 2026
Kind
B2
Abstract

Certain aspects of the present disclosure provide a method for wireless communications at a user equipment (UE). The UE may receive grouping information indicating at least one group of channel state information (CSI) reference signal (RS) resources from a set of CSI-RS resources. The UE may further transmit a CSI report indicating a CSI feedback for the at least one group of CSI-RS resources. The CSI feedback indicates relative phase information for the at least one group of CSI-RS resources with respect to a reference CSI-RS resource.

Claims (64)

1 . A user equipment (UE), comprising:

a memory comprising instructions; and

one or more processors, individually or collectively, configured to execute the instructions to cause the UE to:

receive grouping information indicating at least one group of channel state information (CSI) reference signal (RS) resources from a set of CSI-RS resources; and

transmit a CSI report indicating a CSI feedback for the at least one group of CSI-RS resources configured for a coherent joint transmission (CJT), wherein the CSI feedback indicates relative phase information for the at least one group of CSI-RS resources configured for the CJT with respect to a same reference CSI-RS resource.

2 . The UE of claim 1 , wherein:

each CSI-RS resource of the set of CSI-RS resources is associated with an individual transmission reception point (TRP); and

a set of TRPs corresponding to the set of CSI-RS resources are a maximum number of TRPs that can participate in the CJT.

3 . The UE of claim 1 , wherein:

the at least one group of CSI-RS resources are associated with a group of transmission reception points (TRPs); and

at least one of: the group of TRPs are located at a same location, the group of TRPs operate together, the group of TRPs share a same radio frequency (RF) chain, or the group of TRPs share a same digital port.

4 . The UE of claim 1 , wherein the CSI feedback indicates relative amplitude information for the at least one group of CSI-RS resources with respect to a reference CSI-RS resource.

5 . The UE of claim 1 , wherein the one or more processors, individually or collectively, are configured to execute the instructions to cause the UE to receive, via a first signaling, channel measurement resource (CMR) configuration indicating the set of CSI-RS resources, and wherein the first signaling is a radio resource control (RRC) signaling, a medium access control (MAC)-control element (CE) signaling, or a downlink control information (DCI) signaling.

6 . The UE of claim 5 , wherein the one or more processors, individually or collectively, are configured to execute the instructions to cause the UE to receive the grouping information via the first signaling.

7 . The UE of claim 1 , wherein:

the one or more processors, individually or collectively, are configured to execute the instructions to cause the UE to receive the grouping information via a second signaling; and

the second signaling is a radio resource control (RRC) signaling, a medium access control (MAC) control element (CE) signaling, or a downlink control information (DCI) signaling.

8 . The UE of claim 1 , wherein:

the at least one group of CSI-RS resources correspond to multiple groups of CSI-RS resources; and

each of the multiple groups of CSI-RS resources has a same size.

9 . The UE of claim 1 , wherein:

the at least one group of CSI-RS resources correspond to multiple groups of CSI-RS resources; and

each of the multiple groups of CSI-RS resources has a different size.

10 . A network entity, comprising:

a memory comprising instructions; and

one or more processors, individually or collectively, configured to execute the instructions to cause the network entity to:

transmit grouping information indicating at least one group of channel state information (CSI) reference signal (RS) resources from a set of CSI-RS resources; and

receive a CSI report indicating a CSI feedback for the at least one group of CSI-RS resources configured for a coherent joint transmission (CJT), wherein the CSI feedback indicates relative phase information for the at least one group of CSI-RS resources configured for the CJT with respect to a same reference CSI-RS resource.

11 . The network entity of claim 10 , wherein:

each CSI-RS resource of the set of CSI-RS resources is associated with an individual transmission reception point (TRP); and

a set of TRPs corresponding to the set of CSI-RS resources are a maximum number of TRPs that can participate in the CJT.

12 . The network entity of claim 10 , wherein the CSI feedback indicates relative amplitude information for the at least one group of CSI-RS resources with respect to a reference CSI-RS resource.

13 . A user equipment (UE), comprising:

a memory comprising instructions; and

one or more processors, individually or collectively, configured to execute the instructions to cause the UE to:

receive grouping information indicating one or more groups of channel state information (CSI) reference signal (RS) resources within a set of CSI-RS resources; and

transmit a report indicating at least one of: co-phase information or co- amplitude information for each of the one or more groups of CSI-RS resources configured for a coherent joint transmission (CJT) with respect to a same reference CSI-RS resource.

14 . The UE of claim 13 , wherein:

each CSI-RS resource of the set of CSI-RS resources is associated with an individual transmission reception point (TRP); and

a set of TRPs corresponding to the set of CSI-RS resources are a maximum number of TRPs that can participate in the CJT.

15 . The UE of claim 13 , wherein the one or more processors, individually or collectively, are configured to execute the instructions to cause the UE to receive an indication of the reference CSI-RS resource.

16 . The UE of claim 13 , wherein the one or more processors, individually or collectively, are configured to execute the instructions to cause the UE to transmit an indication of the reference CSI-RS resource.

17 . The UE of claim 13 , wherein the reference CSI-RS resource is associated with a layer 1 (L1) reference signal received power (RSRP) value.

18 . The UE of claim 13 , wherein the co-amplitude information for each of the one or more groups of CSI-RS resources is with respect to the same reference CSI-RS resource.

19 . The UE of claim 18 , wherein the one or more processors, individually or collectively, are configured to execute the instructions to cause the UE to receive an indication of the reference CSI-RS resource.

20 . The UE of claim 18 , wherein the one or more processors, individually or collectively, are configured to execute the instructions to cause the UE to transmit an indication of the reference CSI-RS resource.

21 . The UE of claim 18 , wherein the reference CSI-RS resource is associated with a layer 1 (L1) reference signal received power (RSRP) value.

22 . The UE of claim 13 , wherein:

a group of CSI-RS resources within the one or more groups of CSI-RS resources is associated with a group of transmission reception points (TRPs), and

at least one of: the group of TRPs are located at a same location, the group of TRPs operate together, the group of TRPs share a same radio frequency (RF) chain, or the group of TRPs share a same digital port.

23 . The UE of claim 13 , wherein the one or more processors, individually or collectively, are configured to execute the instructions to cause the UE to receive a configuration for the report, and wherein the configuration indicates at least one of: a periodicity of the report or transmission resources for the report.

24 . The UE of claim 23 , wherein:

at least one of the periodicity or the transmission resources is based on a CSI report configuration; and

the CSI report configuration is for a CSI report indicating a CSI feedback for each CSI-RS resource in each of the one or more groups of CSI-RS resources.

25 . The UE of claim 13 , wherein the one or more processors, individually or collectively, are configured to execute the instructions to cause the UE to select a same frequency domain basis for all CSI-RS resources in a group of CSI-RS resources.

26 . A network entity, comprising:

a memory comprising instructions; and

one or more processors, individually or collectively, configured to execute the instructions to cause the network entity to:

transmit grouping information indicating one or more groups of channel state information (CSI) reference signal (RS) resources within a set of CSI-RS resources; and

receive a report indicating at least one of: co-phase information or co-amplitude information for each of the one or more groups of CSI-RS resources configured for a coherent joint transmission (CJT) with respect to a same reference CSI-RS resource.

27 . The network entity of claim 26 , wherein:

each CSI-RS resource of the set of CSI-RS resources is associated with an individual transmission reception point (TRP); and

a set of TRPs corresponding to the set of CSI-RS resources are a maximum number of TRPs that can participate in the CJT.

28 . The network entity of claim 26 , wherein the reference CSI-RS resource is associated with a layer 1 (L1) reference signal received power (RSRP) value.