Channel state information-reference signal resources with multiple transmission configuration indication states

Patent metadata

Field	Value
Publication number	US-12483317-B2
Application number	US-202017905630-A
Country	US
Kind code	B2
Filing date	Mar 3, 2020
Priority date	Mar 3, 2020
Publication date	Nov 25, 2025
Grant date	Nov 25, 2025

Abstract

Channel state information-reference signal (CSI-RS) resources are disclosed with multiple transmission configuration indication (TCI) states. Example aspects of the present disclosure provide for indications that a given CSI-RS resource is associated with multiple TCI states within various configuration control signaling, depending on whether the CSI-RS is periodic, semi-persistent, or aperiodic. Additionally, where any trigger state corresponds to a CSI-RS resource set in which one or more CSI-RS resources are associated with multiple TCI states, one or more quasi-co-location (QCL) assumptions of the downlink transmission may also be applied by a user equipment (UE) to reception of the CSI-RS resources, where the scheduling offset is less than the threshold beam switch timing reported by the UE.

First claim

What is claimed is:

1 . A method of wireless communication at a user equipment (UE), comprising:
receiving a channel state information-reference signal (CSI-RS) resource configuration, wherein the CSI-RS resource configuration configures an association of at least one CSI-RS resource of a plurality of CSI-RS resources with at least two transmission configuration indicator (TCI) states; identifying a CSI-RS resource of the plurality of CSI-RS resources; and receiving the identified CSI-RS resource using a quasi-co-location (QCL) assumption corresponding to one or more TCI states associated with the identified CSI-RS resource.

2 . The method of claim 1 ,
wherein the CSI-RS resource configuration is received in a radio resource control (RRC) message for semi-persistent CSI-RS resource configuration, wherein the semi-persistent CSI-RS resource configuration configures a number of TCI states associated with each CSI-RS resource of the plurality of CSI-RS resources, and wherein the identifying the CSI-RS resource includes:
receiving a medium access control-control element (MAC-CE) including one or more identified TCI states; and
mapping the one or more identified TCI states to the CSI-RS resource using the number of TCI states associated with each CSI-RS resource in the RRC message for semi-persistent CSI-RS resource configuration.

3 . The method of claim 1 , wherein the CSI-RS resource configuration is received in a medium access control-control element (MAC-CE), wherein the MAC-CE includes an identification of a CSI-RS resource set and a plurality of TCI states associated with the plurality of CSI-RS resources defined in the CSI-RS resource set and an indication of the at least two TCI states from the plurality of TCI states that are associated with a single CSI-RS resource.

4 . The method of claim 1 ,
wherein the CSI-RS resource configuration is received in a radio resource control (RRC) message for an aperiodic CSI-RS resource configuration, wherein the RRC message includes a plurality of CSI trigger states, wherein each CSI trigger state of the plurality of CSI trigger states defines one or more CSI report configurations, and wherein each CSI report configuration of the one or more CSI report configurations defines a corresponding CSI-RS resource set including one or more corresponding CSI-RS resources, and wherein the method further includes:
receiving a medium access control-control element (MAC-CE) that activates a subset of activated CSI trigger states of the plurality of triggers states for aperiodic CSI-RS reporting; and
transmitting a CSI report in response to the identified CSI-RS resource.

5 . The method of claim 4 ,
wherein the RRC message for the aperiodic CSI-RS resource configuration further includes:
a number of TCI states associated with each CSI-RS resource of the plurality of CSI-RS resources in an associated CSI report configuration for an aperiodic CSI trigger state of the subset of activated CSI trigger states; and
a sequence of TCI state identifiers (IDs) identifying at least one TCI state associated with the each CSI-RS resource, including the at least one CSI-RS resource associated with the at least two TCI states; and
wherein the identifying the CSI-RS resource includes:
receiving a downlink control information (DCI) identifying the aperiodic CSI trigger state of the subset of activated CSI trigger states, wherein the aperiodic CSI trigger state is associated with the associated CSI report configuration; and
mapping the CSI-RS resource to the one or more TCI states associated with the CSI-RS resource using the RRC message for aperiodic CSI-RS resource configuration.

6 . The method of claim 4 ,
wherein each CSI report configuration of the one or more CSI report configurations includes a sequence of TCI state identifiers (IDs), wherein each TCI state ID in the sequence of TCI state IDs explicitly references the one or more TCI states associated with each CSI-RS resource of the plurality of CSI-RS resources corresponding to the each CSI report configuration, and wherein the identifying the CSI-RS resource includes:
receiving a downlink control information (DCI) including an identification of a scheduled trigger state in the subset of activated trigger states corresponding to the CSI-RS resource; and
mapping the CSI-RS resource to the one or more TCI states associated with the CSI-RS resource using the sequence of TCI state IDs included in a corresponding CSI report configuration of the one or more CSI report configurations defined by the scheduled trigger state.

7 . A method of wireless communications at a user equipment (UE), comprising:
receiving a radio resource control (RRC) message including an aperiodic triggering state configuration configuring a set of trigger states, one or more trigger states of the set of trigger states including association of at least one channel state information-reference signal (CSI-RS) resource with at least two transmission configuration indicator (TCI) states; receiving a triggering downlink control information (DCI) identifying a trigger state of the set of trigger states that identifies the at least one CSI-RS resource associated with the at least two TCI states; and receiving the at least one CSI-RS resource by application of one or more quasi-co-location (QCL) assumptions according to a relationship between a scheduling offset and a threshold beam switch time.

8 . The method of claim 7 , wherein the application of the one or more QCL assumptions includes:
application of the one or more QCL assumptions associated with the at least two TCI states when the relationship includes the scheduling offset being greater than or equal to a threshold value associated with the threshold beam switch time.

9 . The method of claim 7 , wherein the application of the one or more QCL assumptions includes:
application of two or more QCL assumptions for the reception of the CSI-RS resource when the relationship includes the scheduling offset being less than a threshold value associated with the threshold beam switch time.

10 . The method of claim 9 , wherein the application of the two or more QCL assumptions includes:
identifying at least one downlink transmission within a same set of symbols as the CSI-RS resource; and determining that the at least one downlink transmission is associated with at least two downlink TCI states, wherein the two or more QCL assumptions are associated with the at least two downlink TCI states.

11 . The method of claim 9 , wherein the application of the two or more QCL assumptions includes:
identifying two or more downlink transmissions within a same set of symbols as the CSI-RS resource; and determining that one or more downlink transmissions of the two or more downlink transmissions is associated with a single TCI state that is different from the single TCI state associated with one or more other downlink transmissions of the two or more downlink transmissions, wherein the two or more QCL assumptions are associated with the single TCI state of the two or more downlink transmissions.

12 . The method of claim 9 , wherein the application of the two or more QCL assumptions includes:
identifying two or more downlink transmissions within a same set of symbols as the CSI-RS resource, wherein the two or more downlink transmissions are associated with a same TCI state; determining a first QCL assumption of the two or more QCL assumptions for application to a first port group of the at least one CSI-RS resource, wherein the first QCL assumption is associated with the same TCI state; and determining one or more default QCL assumptions of t

Assignees

• Qualcomm Inc
• Khoshnevisan Mostafa
• Hao Chenxi
• Zhang Yu
• Zhang Xiaoxia
• Xu Hao

Inventors

• Khoshnevisan Mostafa
• Hao Chenxi
• Zhang Yu
• Zhang Xiaoxia
• Xu Hao

Classifications

• H04L5/0094

  Indication of how sub-channels of the path are allocated · CPC title

• H04L5/0085

  when channel conditions change · CPC title

• H04L5/0057

  Physical resource allocation for CQI · CPC title

• H04L5/0051

  of dedicated pilots, i.e. pilots destined for a single user or terminal · CPC title

• H04B7/0626

  Channel coefficients, e.g. channel state information [CSI] · CPC title