WO2025097325A1

WO2025097325A1 - Channel state information reference signal resource indicator for aggregated channel state information reference signal resources

Info

Publication number: WO2025097325A1
Application number: PCT/CN2023/130392
Authority: WO
Inventors: Jing Dai; Min Huang; Hao Xu
Original assignee: Qualcomm Inc
Current assignee: Qualcomm Inc
Priority date: 2023-11-08
Filing date: 2023-11-08
Publication date: 2025-05-15
Anticipated expiration: 2026-05-08

Abstract

Methods, systems, and devices for wireless communications are described. A network entity may transmit channel state information reference signals (CSI-RSs) to a user equipment (UE) via a set of configured CSI-RS resources. The UE may perform measurements on the CSI-RSs and generate and transmit a CSI report based on the measurements. A CSI report may indicate a CSI-RS resource indicator (CRI) which indicates CSI-RS resources from the configured CSI-RS resources and may be used for precoding with hybrid beamforming, as each CSI-RS resource may correspond to an analog beam. Different groups of CSI-RS resources may be associated with the same respective antenna port indices at the network entity. The UE may report one or more subsets of CSI-RS resources (e.g., one or more CRIs), where each subset of CSI-RS resources includes one CSI-RS resource from each group and where each subset may be associated with a same analog beam.

Description

CHANNEL STATE INFORMATION REFERENCE SIGNAL RESOURCE INDICATOR FOR AGGREGATED CHANNEL STATE INFORMATION REFERENCE SIGNAL RESOURCES

FIELD OF TECHNOLOGY

The following relates to wireless communications, including channel state information (CSI) reference signal (CSI-RS) resource indicator for aggregated channel state information reference signal (CSI-RS) resources.

BACKGROUND

Wireless communications systems are widely deployed to provide various types of communication content such as voice, video, packet data, messaging, broadcast, and so on. These systems may be capable of supporting communication with multiple users by sharing the available system resources (e.g., time, frequency, and power) . Examples of such multiple-access systems include fourth generation (4G) systems such as Long Term Evolution (LTE) systems, LTE-Advanced (LTE-A) systems, or LTE-A Pro systems, and fifth generation (5G) systems which may be referred to as New Radio (NR) systems. These systems may employ technologies such as code division multiple access (CDMA) , time division multiple access (TDMA) , frequency division multiple access (FDMA) , orthogonal FDMA (OFDMA) , or discrete Fourier transform spread orthogonal frequency division multiplexing (DFT-S-OFDM) . A wireless multiple-access communications system may include one or more base stations, each supporting wireless communication for communication devices, which may be known as user equipment (UE) .

SUMMARY

The described techniques relate to improved methods, systems, devices, and apparatuses that support channel state information (CSI) reference signal (CSI-RS) resource indicator (CRI) for aggregated CSI-RSs. A network entity may transmit CSI-RSs to a user equipment (UE) via a set of configured CSI-RS resources. The UE may perform measurements on the set of CSI-RS and may generate and transmit a CSI report based on the measurements of the CSI-RSs. The network entity may use a set of antenna ports to transmit the set of CSI-RS. The UE may transmit the CSI report to the network entity such that the network entity may identify suitable configurations for communications with the UE. For example, a CSI report may include an indication of a CRI by which the UE indicates one or more subsets of CSI-RS resources from configured CSI-RS resources via which the CSI-RSs are received. Different groups of CSI-RS resources may be associated with the same respective antenna port indices at the network entity. The UE may report an indication of the one or more subsets of CSI-RS resources (e.g., via a CRI) , where each subset of CSI-RS resources includes one CSI-RS resource from each group and where each subset may be associated with a same analog beam (e.g., associated with a same transmission configuration indicator (TCI) state) .

A method for wireless communications by a UE is described. The method may include receiving, from a network entity, control signaling indicating a set of CSI-RS resources, where the set of CSI-RS resources includes a set of multiple groups of CSI-RS resources, each group of the set of multiple groups is associated with a respective set of antenna port indices at the network entity, where the set of CSI-RS resources includes a set of multiple subsets of CSI-RS resources, and where each subset of CSI-RS resources includes one CSI-RS resource from each group, receiving, from the network entity, a set of CSI-RSs via the set of CSI-RS resources, and transmit, to the network entity based on the set of CSI-RSs, an uplink control message indicating one or more subsets of the set of multiple subsets of CSI-RS resources.

A UE for wireless communications is described. The UE may include one or more memories storing processor executable code, and one or more processors coupled with the one or more memories. The one or more processors may individually or collectively operable to execute the code to cause the UE to receive, from a network entity, control signaling indicating a set of CSI-RS resources, where the set of CSI-RS resources includes a set of multiple groups of CSI-RS resources, each group of the set of multiple groups is associated with a respective set of antenna port indices at the network entity, where the set of CSI-RS resources includes a set of multiple subsets of CSI-RS resources, and where each subset of CSI-RS resources includes one CSI-RS resource from each group, receive, from the network entity, a set of CSI-RSs via the set of CSI-RS resources, and transmit, to the network entity based on the set of CSI-RSs, an uplink control message indicating one or more subsets of the set of multiple subsets of CSI-RS resources.

Another UE for wireless communications is described. The UE may include means for receiving, from a network entity, control signaling indicating a set of CSI-RS resources, where the set of CSI-RS resources includes a set of multiple groups of CSI-RS resources, each group of the set of multiple groups is associated with a respective set of antenna port indices at the network entity, where the set of CSI-RS resources includes a set of multiple subsets of CSI-RS resources, and where each subset of CSI-RS resources includes one CSI-RS resource from each group, means for receiving, from the network entity, a set of CSI-RSs via the set of CSI-RS resources, and means for transmit, to the network entity based on the set of CSI-RSs, an uplink control message indicating one or more subsets of the set of multiple subsets of CSI-RS resources.

A non-transitory computer-readable medium storing code for wireless communications is described. The code may include instructions executable by one or more processors to receive, from a network entity, control signaling indicating a set of CSI-RS resources, where the set of CSI-RS resources includes a set of multiple groups of CSI-RS resources, each group of the set of multiple groups is associated with a respective set of antenna port indices at the network entity, where the set of CSI-RS resources includes a set of multiple subsets of CSI-RS resources, and where each subset of CSI-RS resources includes one CSI-RS resource from each group, receive, from the network entity, a set of CSI-RSs via the set of CSI-RS resources, and transmit, to the network entity based on the set of CSI-RSs, an uplink control message indicating one or more subsets of the set of multiple subsets of CSI-RS resources.

Some examples of the method, UEs, and non-transitory computer-readable medium described herein may further include operations, features, means, or instructions for receiving second control signaling indicating a preconfigured quantity of subsets to report, where a quantity of the one or more subsets of the set of multiple subsets indicated by the uplink control message may be equal to the preconfigured quantity of subsets.

Some examples of the method, UEs, and non-transitory computer-readable medium described herein may further include operations, features, means, or instructions for receiving second control signaling indicating a threshold quantity of subsets to report, where a quantity of the one or more subsets indicated by the uplink control message may be less than or equal to the threshold quantity of subsets.

In some examples of the method, UEs, and non-transitory computer-readable medium described herein, transmitting the uplink control message may include operations, features, means, or instructions for transmitting a respective channel state feedback report for each of the one or more subsets, where a quantity of the one or more subsets may be greater than one.

Some examples of the method, UEs, and non-transitory computer-readable medium described herein may further include operations, features, means, or instructions for transmitting, to the network entity and prior to transmission of the uplink control message, a second uplink control message indicating the quantity of the one or more subsets.

In some examples of the method, UEs, and non-transitory computer-readable medium described herein, the second uplink control message indicates respective quantities of subsets for each of a set of multiple channel state feedback reporting occasions and the uplink control message may be one of the set of multiple channel state feedback reporting occasions.

In some examples of the method, UEs, and non-transitory computer-readable medium described herein, transmitting the second uplink control message may include operations, features, means, or instructions for transmitting the second uplink control message via a medium access control (MAC) control element.

Some examples of the method, UEs, and non-transitory computer-readable medium described herein may further include operations, features, means, or instructions for receiving, via the control signaling, an indication of a same respective power offset value for each CSI-RS resource within a same subset of CSI-RS resources.

Some examples of the method, UEs, and non-transitory computer-readable medium described herein may further include operations, features, means, or instructions for receiving, via the control signaling, an indication of a same respective resource block for each CSI-RS resource within a same subset of CSI-RS resources.

In some examples of the method, UEs, and non-transitory computer-readable medium described herein, each CSI-RS resource within a same subset of CSI-RS resources may be scheduled within a threshold duration without a switch between downlink and uplink.

Some examples of the method, UEs, and non-transitory computer-readable medium described herein may further include operations, features, means, or instructions for receiving, via the control signaling, an indication of a first dimension size associated with a channel state information report setting and an indication of a second dimension size associated with the channel state information report setting, where the first dimension size may be split equally into a quantity of multiples for CSI-RS port indexing of the set of multiple groups of CSI-RS resources.

In some examples of the method, UEs, and non-transitory computer-readable medium described herein, the first dimension size may be one of a horizontal dimension size or a vertical dimension size.

In some examples of the method, UEs, and non-transitory computer-readable medium described herein, each respective set of antenna port indices includes one or more antenna ports of a first polarization and one or more antenna ports of a second polarization.

In some examples of the method, UEs, and non-transitory computer-readable medium described herein, a total quantity of antenna ports at the network entity used to transmit the set of CSI-RSs may be greater than 32.

In some examples of the method, UEs, and non-transitory computer-readable medium described herein, each subset of CSI-RS resources may be associated with a respective transmission configuration indicator (TCI) state and a respective quasi-co-location (QCL) source reference signal.

A method for wireless communications by a network entity is described. The method may include transmitting, to a UE, control signaling indicating a set of CSI-RS resources, where the set of CSI-RS resources includes a set of multiple groups of CSI-RS resources, each group of the set of multiple groups is associated with a respective set of antenna port indices at the network entity, where the set of CSI-RS resources includes a set of multiple subsets of CSI-RS resources, and where each subset of CSI-RS resources includes one CSI-RS resource from each group, transmitting, to the UE, a set of CSI-RSs via the set of CSI-RS resources, and receiving, from the UE based on the set of CSI-RSs, an uplink control message indicating one or more subsets of the set of multiple subsets of CSI-RS resources.

A network entity for wireless communications is described. The network entity may include one or more memories storing processor executable code, and one or more processors coupled with the one or more memories. The one or more processors may individually or collectively operable to execute the code to cause the network entity to transmit, to a UE, control signaling indicating a set of CSI-RS resources, where the set of CSI-RS resources includes a set of multiple groups of CSI-RS resources, each group of the set of multiple groups is associated with a respective set of antenna port indices at the network entity, where the set of CSI-RS resources includes a set of multiple subsets of CSI-RS resources, and where each subset of CSI-RS resources includes one CSI-RS resource from each group, transmit, to the UE, a set of CSI-RSs via the set of CSI-RS resources, and receive, from the UE based on the set of CSI-RSs, an uplink control message indicating one or more subsets of the set of multiple subsets of CSI-RS resources.

Another network entity for wireless communications is described. The network entity may include means for transmitting, to a UE, control signaling indicating a set of CSI-RS resources, where the set of CSI-RS resources includes a set of multiple groups of CSI-RS resources, each group of the set of multiple groups is associated with a respective set of antenna port indices at the network entity, where the set of CSI-RS resources includes a set of multiple subsets of CSI-RS resources, and where each subset of CSI-RS resources includes one CSI-RS resource from each group, means for transmitting, to the UE, a set of CSI-RSs via the set of CSI-RS resources, and means for receiving, from the UE based on the set of CSI-RSs, an uplink control message indicating one or more subsets of the set of multiple subsets of CSI-RS resources.

A non-transitory computer-readable medium storing code for wireless communications is described. The code may include instructions executable by one or more processors to transmit, to a UE, control signaling indicating a set of CSI-RS resources, where the set of CSI-RS resources includes a set of multiple groups of CSI- RS resources, each group of the set of multiple groups is associated with a respective set of antenna port indices at the network entity, where the set of CSI-RS resources includes a set of multiple subsets of CSI-RS resources, and where each subset of CSI-RS resources includes one CSI-RS resource from each group, transmit, to the UE, a set of CSI-RSs via the set of CSI-RS resources, and receive, from the UE based on the set of CSI-RSs, an uplink control message indicating one or more subsets of the set of multiple subsets of CSI-RS resources.

Some examples of the method, network entities, and non-transitory computer-readable medium described herein may further include operations, features, means, or instructions for transmitting second control signaling indicating a preconfigured quantity of subsets to report, where a quantity of the one or more subsets of the set of multiple subsets indicated by the uplink control message may be equal to the preconfigured quantity of subsets.

Some examples of the method, network entities, and non-transitory computer-readable medium described herein may further include operations, features, means, or instructions for transmitting second control signaling indicating a threshold quantity of subsets to report, where a quantity of the one or more subsets of the set of multiple subsets indicated by the uplink control message may be less than or equal to the threshold quantity of subsets.

In some examples of the method, network entities, and non-transitory computer-readable medium described herein, receiving the uplink control message may include operations, features, means, or instructions for receiving a respective channel state feedback report for each of the one or more subsets, where a quantity of the one or more subsets may be greater than one.

Some examples of the method, network entities, and non-transitory computer-readable medium described herein may further include operations, features, means, or instructions for receiving, from the UE and prior to reception of the uplink control message, a second uplink control message indicating the quantity of the one or more subsets.

In some examples of the method, network entities, and non-transitory computer-readable medium described herein, the second uplink control message indicates respective quantities of subsets for each of a set of multiple channel state feedback reporting occasions and the uplink control message may be one of the set of multiple channel state feedback reporting occasions.

In some examples of the method, network entities, and non-transitory computer-readable medium described herein, receiving the second uplink control message may include operations, features, means, or instructions for receiving the second uplink control message via a MAC control element.

Some examples of the method, network entities, and non-transitory computer-readable medium described herein may further include operations, features, means, or instructions for transmitting, via the control signaling, an indication of a same respective power offset value for each CSI-RS resource within a same subset of CSI-RS resources.

Some examples of the method, network entities, and non-transitory computer-readable medium described herein may further include operations, features, means, or instructions for transmitting, via the control signaling, an indication of a same respective resource block for each CSI-RS resource within a same subset of CSI-RS resources.

In some examples of the method, network entities, and non-transitory computer-readable medium described herein, each CSI-RS resource within a same subset of CSI-RS resources may be scheduled within a threshold duration without a switch between uplink and downlink.

Some examples of the method, network entities, and non-transitory computer-readable medium described herein may further include operations, features, means, or instructions for transmitting, via the control signaling, an indication of a first dimension size associated with a channel state information report setting and an indication of a second dimension size associated with the channel state information report setting, where the first dimension size may be split equally into a quantity of multiples for CSI-RS port indexing of the set of multiple groups of CSI-RS resources.

In some examples of the method, network entities, and non-transitory computer-readable medium described herein, the first dimension size may be one of a horizontal dimension size or a vertical dimension size.

In some examples of the method, network entities, and non-transitory computer-readable medium described herein, each respective set of antenna port indices includes one or more antenna ports of a first polarization and one or more antenna ports of a second polarization.

In some examples of the method, network entities, and non-transitory computer-readable medium described herein, a total quantity of antenna ports at the network entity used to transmit the set of CSI-RSs may be greater than 32.

In some examples of the method, network entities, and non-transitory computer-readable medium described herein, each subset of CSI-RS resources may be associated with a respective TCI state and a respective QCL source reference signal.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 shows an example of a wireless communications system that supports channel state information (CSI) reference signal (CSR-RS) resource indicator (CRI) for aggregated CSI-RSs in accordance with one or more aspects of the present disclosure.

FIG. 2 shows an example of a wireless communication system that supports CRI for aggregated CSI-RS resources in accordance with one or more aspects of the present disclosure.

FIG. 3 shows an example of a CSI-RS resource diagram that supports CRI for aggregated CSI-RS resources in accordance with one or more aspects of the present disclosure.

FIG. 4 shows an example of a port indexing scheme that supports CRI for aggregated CSI-RS resources in accordance with one or more aspects of the present disclosure.

FIG. 5 shows an example of a port indexing scheme that supports CRI for aggregated CSI-RS resources in accordance with one or more aspects of the present disclosure.

FIG. 6 shows an example of a process flow that supports CRI for aggregated CSI-RS resources in accordance with one or more aspects of the present disclosure.

FIGs. 7 and 8 show block diagrams of devices that support CRI for aggregated CSI-RS resources in accordance with one or more aspects of the present disclosure.

FIG. 9 shows a block diagram of a communications manager that supports CRI for aggregated CSI-RS resources in accordance with one or more aspects of the present disclosure.

FIG. 10 shows a diagram of a system including a device that supports CRI for aggregated CSI-RS resources in accordance with one or more aspects of the present disclosure.

FIGs. 11 and 12 show block diagrams of devices that support CRI for aggregated CSI-RS resources in accordance with one or more aspects of the present disclosure.

FIG. 13 shows a block diagram of a communications manager that supports CRI for aggregated CSI-RS resources in accordance with one or more aspects of the present disclosure.

FIG. 14 shows a diagram of a system including a device that supports CRI for aggregated CSI-RS resources in accordance with one or more aspects of the present disclosure.

FIGs. 15 and 16 show flowcharts illustrating methods that support CRI for aggregated CSI-RS resources in accordance with one or more aspects of the present disclosure.

DETAILED DESCRIPTION

In wireless communications systems, a network entity may transmit channel state information (CSI) reference signals (CSI-RSs) to a user equipment (UE) over CSI-RS resources. The UE may perform measurements on the CSI-RSs and may generate a CSI report based on the measurements of the CSI-RSs. The UE may transmit the CSI report to the network entity such that the network entity may identify suitable configurations for communications with the UE. For example, a CSI report may include an indication of a CSI-RS resource indicator (CRI) by which the UE indicates a subset of CSI-RS resources from configured CSI-RS resources via which the CSI-RSs are received. In some examples, CRI may be used for precoding with hybrid beamforming, as each CSI-RS resource may correspond to one analog beam. The network entity may use a set of multiple antenna ports to transmit the CSI-RSs (e.g., antenna ports corresponding to antenna elements of an antenna array of the network entity) .

The use of a relatively greater quantity of CSI ports at the network entity allows for relatively smaller beams, and therefore more accurate channel estimation and more precise beam selection. In some wireless communications systems, CSI codebooks may support up to 32 antenna ports, but a relatively greater quantity of antenna ports (e.g., greater than 32 antenna ports) may be used in some radio frequency spectrum bands (e.g., higher frequency range 1 (FR1) bands including frequencies, for example, between 3 GHz and 6 GHz or some frequency range 3 (FR3) bands, for example, including frequencies between 7 GHz and 24 GHz) . CSI configurations for more than 32 antenna ports may aggregate multiple CSI-RS resources (e.g., 128 port CSI may be supported as four 32 port CSI-RS resources) , which may avoid updates to CSI-RS resources and/or configurations associated with greater than 32 antenna ports. However, techniques for indicating CRI for aggregated CSI-RS resources may be undefined. Additionally, some networks may implement multi-user multiple-input multiple-output (MU-MIMO) , and UEs scheduled or paired for MU-MIMO may report a same beam (e.g., based on the reported CRIs) .

Aspects of the present disclosure relate to groupings of CSI-RS resources associated with the same antenna port indices and reporting of one more subsets of CSI-RS resources (e.g., reporting of one or more CRIs) to support aggregated CSI-RSs, where each subset of CSI-RS resources includes one CSI-RS resource from each group. For example, each CSI-RS resource in a same group of CSI-RS resources may be associated with a same set of antenna port indices at the network entity, and each CSI-RS resource in a same subset of CSI-RSs may be associated with a same beam (e.g., associated with a same transmission configuration indicator (TCI) state and same quasi co-location (QCL) source reference signal) . Each subset of CSI-RS resources may include one CSI-RS resource from each of the groups. For example, 128 antenna ports at the network entity may be represented as 4 groups of CSI-RSs each having 32 ports. The CRI indicated by the UE (e.g., in a CSI report) may indicate one or more subsets of CSI-RS resources. As each subset of CSI-RS resources is associated with the same analog beam, by reporting multiple subsets of CSI-RS resources (e.g., more than one CRI) , the UE may be relatively more likely to be paired or scheduled for MU-MIMO, thus increasing network efficiency.

Aspects of the disclosure are initially described in the context of wireless communications systems. Aspects of the disclosure are further illustrated by and described with reference to CSI-RS resource diagrams, port indexing schemes, and process flows. Aspects of the disclosure are further illustrated by and described with reference to apparatus diagrams, system diagrams, and flowcharts that relate to CRI for aggregated CSI-RS resources.

FIG. 1 shows an example of a wireless communications system 100 that supports CRI for aggregated CSI-RS resources in accordance with one or more aspects of the present disclosure. The wireless communications system 100 may include one or more network entities 105, one or more UEs 115, and a core network 130. In some examples, the wireless communications system 100 may be a Long Term Evolution (LTE) network, an LTE-Advanced (LTE-A) network, an LTE-A Pro network, a New Radio (NR) network, or a network operating in accordance with other systems and radio technologies, including future systems and radio technologies not explicitly mentioned herein.

The network entities 105 may be dispersed throughout a geographic area to form the wireless communications system 100 and may include devices in different forms or having different capabilities. In various examples, a network entity 105 may be referred to as a network element, a mobility element, a radio access network (RAN) node, or network equipment, among other nomenclature. In some examples, network entities 105 and UEs 115 may wirelessly communicate via one or more communication links 125 (e.g., a radio frequency (RF) access link) . For example, a network entity 105 may support a coverage area 110 (e.g., a geographic coverage area) over which the UEs 115 and the network entity 105 may establish one or more communication links 125. The coverage area 110 may be an example of a geographic area over which a network entity 105 and a UE 115 may support the communication of signals according to one or more radio access technologies (RATs) .

The UEs 115 may be dispersed throughout a coverage area 110 of the wireless communications system 100, and each UE 115 may be stationary, or mobile, or both at different times. The UEs 115 may be devices in different forms or having different capabilities. Some example UEs 115 are illustrated in FIG. 1. The UEs 115 described herein may be capable of supporting communications with various types of devices, such as other UEs 115 or network entities 105, as shown in FIG. 1.

As described herein, a node of the wireless communications system 100, which may be referred to as a network node, or a wireless node, may be a network entity 105 (e.g., any network entity described herein) , a UE 115 (e.g., any UE described herein) , a network controller, an apparatus, a device, a computing system, one or more components, or another suitable processing entity configured to perform any of the techniques described herein. For example, a node may be a UE 115. As another example, a node may be a network entity 105. As another example, a first node may be configured to communicate with a second node or a third node. In one aspect of this example, the first node may be a UE 115, the second node may be a network entity 105, and the third node may be a UE 115. In another aspect of this example, the first node may be a UE 115, the second node may be a network entity 105, and the third node may be a network entity 105. In yet other aspects of this example, the first, second, and third nodes may be different relative to these examples. Similarly, reference to a UE 115, network entity 105, apparatus, device, computing system, or the like may include disclosure of the UE 115, network entity 105, apparatus, device, computing system, or the like being a node. For example, disclosure that a UE 115 is configured to receive information from a network entity 105 also discloses that a first node is configured to receive information from a second node.

In some examples, network entities 105 may communicate with the core network 130, or with one another, or both. For example, network entities 105 may communicate with the core network 130 via one or more backhaul communication links 120 (e.g., in accordance with an S1, N2, N3, or other interface protocol) . In some examples, network entities 105 may communicate with one another via a backhaul communication link 120 (e.g., in accordance with an X2, Xn, or other interface protocol) either directly (e.g., directly between network entities 105) or indirectly (e.g., via a core network 130) . In some examples, network entities 105 may communicate with one another via a midhaul communication link 162 (e.g., in accordance with a midhaul interface protocol) or a fronthaul communication link 168 (e.g., in accordance with a fronthaul interface protocol) , or any combination thereof. The backhaul communication links 120, midhaul communication links 162, or fronthaul communication links 168 may be or include one or more wired links (e.g., an electrical link, an optical fiber link) , one or more wireless links (e.g., a radio link, a wireless optical link) , among other examples or various combinations thereof. A UE 115 may communicate with the core network 130 via a communication link 155.

One or more of the network entities 105 described herein may include or may be referred to as a base station 140 (e.g., a base transceiver station, a radio base station, an NR base station, an access point, a radio transceiver, a NodeB, an eNodeB (eNB) , a next-generation NodeB or a giga-NodeB (either of which may be referred to as a gNB) , a 5G NB, a next-generation eNB (ng-eNB) , a Home NodeB, a Home eNodeB, or other suitable terminology) . In some examples, a network entity 105 (e.g., a base station 140) may be implemented in an aggregated (e.g., monolithic, standalone) base station architecture, which may be configured to utilize a protocol stack that is physically or logically integrated within a single network entity 105 (e.g., a single RAN node, such as a base station 140) .

In some examples, a network entity 105 may be implemented in a disaggregated architecture (e.g., a disaggregated base station architecture, a disaggregated RAN architecture) , which may be configured to utilize a protocol stack that is physically or logically distributed among two or more network entities 105, such as an integrated access backhaul (IAB) network, an open RAN (O-RAN) (e.g., a network configuration sponsored by the O-RAN Alliance) , or a virtualized RAN (vRAN) (e.g., a cloud RAN (C-RAN) ) . For example, a network entity 105 may include one or more of a central unit (CU) 160, a distributed unit (DU) 165, a radio unit (RU) 170, a RAN Intelligent Controller (RIC) 175 (e.g., a Near-Real Time RIC (Near-RT RIC) , a Non-Real Time RIC (Non-RT RIC) ) , a Service Management and Orchestration (SMO) 180 system, or any combination thereof. An RU 170 may also be referred to as a radio head, a smart radio head, a remote radio head (RRH) , a remote radio unit (RRU) , or a transmission reception point (TRP) . One or more components of the network entities 105 in a disaggregated RAN architecture may be co-located, or one or more components of the network entities 105 may be located in distributed locations (e.g., separate physical locations) . In some examples, one or more network entities 105 of a disaggregated RAN architecture may be implemented as virtual units (e.g., a virtual CU (VCU) , a virtual DU (VDU) , a virtual RU (VRU) ) .

The split of functionality between a CU 160, a DU 165, and an RU 170 is flexible and may support different functionalities depending on which functions (e.g., network layer functions, protocol layer functions, baseband functions, RF functions, and any combinations thereof) are performed at a CU 160, a DU 165, or an RU 170. For example, a functional split of a protocol stack may be employed between a CU 160 and a DU 165 such that the CU 160 may support one or more layers of the protocol stack and the DU 165 may support one or more different layers of the protocol stack. In some examples, the CU 160 may host upper protocol layer (e.g., layer 3 (L3) , layer 2 (L2) ) functionality and signaling (e.g., Radio Resource Control (RRC) , service data adaption protocol (SDAP) , Packet Data Convergence Protocol (PDCP) ) . The CU 160 may be connected to one or more DUs 165 or RUs 170, and the one or more DUs 165 or RUs 170 may host lower protocol layers, such as layer 1 (L1) (e.g., physical (PHY) layer) or L2 (e.g., radio link control (RLC) layer, medium access control (MAC) layer) functionality and signaling, and may each be at least partially controlled by the CU 160. Additionally, or alternatively, a functional split of the protocol stack may be employed between a DU 165 and an RU 170 such that the DU 165 may support one or more layers of the protocol stack and the RU 170 may support one or more different layers of the protocol stack. The DU 165 may support one or multiple different cells (e.g., via one or more RUs 170) . In some cases, a functional split between a CU 160 and a DU 165, or between a DU 165 and an RU 170 may be within a protocol layer (e.g., some functions for a protocol layer may be performed by one of a CU 160, a DU 165, or an RU 170, while other functions of the protocol layer are performed by a different one of the CU 160, the DU 165, or the RU 170) . A CU 160 may be functionally split further into CU control plane (CU-CP) and CU user plane (CU-UP) functions. A CU 160 may be connected to one or more DUs 165 via a midhaul communication link 162 (e.g., F1, F1-c, F1-u) , and a DU 165 may be connected to one or more RUs 170 via a fronthaul communication link 168 (e.g., open fronthaul (FH) interface) . In some examples, a midhaul communication link 162 or a fronthaul communication link 168 may be implemented in accordance with an interface (e.g., a channel) between layers of a protocol stack supported by respective network entities 105 that are in communication via such communication links.

In wireless communications systems (e.g., wireless communications system 100) , infrastructure and spectral resources for radio access may support wireless backhaul link capabilities to supplement wired backhaul connections, providing an IAB network architecture (e.g., to a core network 130) . In some cases, in an IAB network, one or more network entities 105 (e.g., IAB nodes 104) may be partially controlled by each other. One or more IAB nodes 104 may be referred to as a donor entity or an IAB donor. One or more DUs 165 or one or more RUs 170 may be partially controlled by one or more CUs 160 associated with a donor network entity 105 (e.g., a donor base station 140) . The one or more donor network entities 105 (e.g., IAB donors) may be in communication with one or more additional network entities 105 (e.g., IAB nodes 104) via supported access and backhaul links (e.g., backhaul communication links 120) . IAB nodes 104 may include an IAB mobile termination (IAB-MT) controlled (e.g., scheduled) by DUs 165 of a coupled IAB donor. An IAB-MT may include an independent set of antennas for relay of communications with UEs 115, or may share the same antennas (e.g., of an RU 170) of an IAB node 104 used for access via the DU 165 of the IAB node 104 (e.g., referred to as virtual IAB-MT (vIAB-MT) ) . In some examples, the IAB nodes 104 may include DUs 165 that support communication links with additional entities (e.g., IAB nodes 104, UEs 115) within the relay chain or configuration of the access network (e.g., downstream) . In such cases, one or more components of the disaggregated RAN architecture (e.g., one or more IAB nodes 104 or components of IAB nodes 104) may be configured to operate according to the techniques described herein.

In the case of the techniques described herein applied in the context of a disaggregated RAN architecture, one or more components of the disaggregated RAN architecture may be configured to support CRI for aggregated CSI-RS resources as described herein. For example, some operations described as being performed by a UE 115 or a network entity 105 (e.g., a base station 140) may additionally, or alternatively, be performed by one or more components of the disaggregated RAN architecture (e.g., IAB nodes 104, DUs 165, CUs 160, RUs 170, RIC 175, SMO 180) .

A UE 115 may include or may be referred to as a mobile device, a wireless device, a remote device, a handheld device, or a subscriber device, or some other suitable terminology, where the “device” may also be referred to as a unit, a station, a terminal, or a client, among other examples. A UE 115 may also include or may be referred to as a personal electronic device such as a cellular phone, a personal digital assistant (PDA) , a tablet computer, a laptop computer, or a personal computer. In some examples, a UE 115 may include or be referred to as a wireless local loop (WLL) station, an Internet of Things (IoT) device, an Internet of Everything (IoE) device, or a machine type communications (MTC) device, among other examples, which may be implemented in various objects such as appliances, or vehicles, meters, among other examples.

The UEs 115 described herein may be able to communicate with various types of devices, such as other UEs 115 that may sometimes act as relays as well as the network entities 105 and the network equipment including macro eNBs or gNBs, small cell eNBs or gNBs, or relay base stations, among other examples, as shown in FIG. 1.

The UEs 115 and the network entities 105 may wirelessly communicate with one another via one or more communication links 125 (e.g., an access link) using resources associated with one or more carriers. The term “carrier” may refer to a set of RF spectrum resources having a defined physical layer structure for supporting the communication links 125. For example, a carrier used for a communication link 125 may include a portion of a RF spectrum band (e.g., a bandwidth part (BWP) ) that is operated according to one or more physical layer channels for a given radio access technology (e.g., LTE, LTE-A, LTE-A Pro, NR) . Each physical layer channel may carry acquisition signaling (e.g., synchronization signals, system information) , control signaling that coordinates operation for the carrier, user data, or other signaling. The wireless communications system 100 may support communication with a UE 115 using carrier aggregation or multi-carrier operation. A UE 115 may be configured with multiple downlink component carriers and one or more uplink component carriers according to a carrier aggregation configuration. Carrier aggregation may be used with both frequency division duplexing (FDD) and time division duplexing (TDD) component carriers. Communication between a network entity 105 and other devices may refer to communication between the devices and any portion (e.g., entity, sub-entity) of a network entity 105. For example, the terms “transmitting, ” “receiving, ” or “communicating, ” when referring to a network entity 105, may refer to any portion of a network entity 105 (e.g., a base station 140, a CU 160, a DU 165, a RU 170) of a RAN communicating with another device (e.g., directly or via one or more other network entities 105) .

The communication links 125 shown in the wireless communications system 100 may include downlink transmissions (e.g., forward link transmissions) from a network entity 105 to a UE 115, uplink transmissions (e.g., return link transmissions) from a UE 115 to a network entity 105, or both, among other configurations of transmissions. Carriers may carry downlink or uplink communications (e.g., in an FDD mode) or may be configured to carry downlink and uplink communications (e.g., in a TDD mode) .

A carrier may be associated with a particular bandwidth of the RF spectrum and, in some examples, the carrier bandwidth may be referred to as a “system bandwidth” of the carrier or the wireless communications system 100. For example, the carrier bandwidth may be one of a set of bandwidths for carriers of a particular radio access technology (e.g., 1.4, 3, 5, 10, 15, 20, 40, or 80 megahertz (MHz) ) . Devices of the wireless communications system 100 (e.g., the network entities 105, the UEs 115, or both) may have hardware configurations that support communications using a particular carrier bandwidth or may be configurable to support communications using one of a set of carrier bandwidths. In some examples, the wireless communications system 100 may include network entities 105 or UEs 115 that support concurrent communications using carriers associated with multiple carrier bandwidths. In some examples, each served UE 115 may be configured for operating using portions (e.g., a sub-band, a BWP) or all of a carrier bandwidth.

Signal waveforms transmitted via a carrier may be made up of multiple subcarriers (e.g., using multi-carrier modulation (MCM) techniques such as orthogonal frequency division multiplexing (OFDM) or discrete Fourier transform spread OFDM (DFT-S-OFDM) ) . In a system employing MCM techniques, a resource element may refer to resources of one symbol period (e.g., a duration of one modulation symbol) and one subcarrier, in which case the symbol period and subcarrier spacing may be inversely related. The quantity of bits carried by each resource element may depend on the modulation scheme (e.g., the order of the modulation scheme, the coding rate of the modulation scheme, or both) , such that a relatively higher quantity of resource elements (e.g., in a transmission duration) and a relatively higher order of a modulation scheme may correspond to a relatively higher rate of communication. A wireless communications resource may refer to a combination of an RF spectrum resource, a time resource, and a spatial resource (e.g., a spatial layer, a beam) , and the use of multiple spatial resources may increase the data rate or data integrity for communications with a UE 115.

One or more numerologies for a carrier may be supported, and a numerology may include a subcarrier spacing (Δf) and a cyclic prefix. A carrier may be divided into one or more BWPs having the same or different numerologies. In some examples, a UE 115 may be configured with multiple BWPs. In some examples, a single BWP for a carrier may be active at a given time and communications for the UE 115 may be restricted to one or more active BWPs.

The time intervals for the network entities 105 or the UEs 115 may be expressed in multiples of a basic time unit which may, for example, refer to a sampling period of T_s=1/ (Δf_max·N_f) seconds, for which Δf_max may represent a supported subcarrier spacing, and N_f may represent a supported discrete Fourier transform (DFT) size. Time intervals of a communications resource may be organized according to radio frames each having a specified duration (e.g., 10 milliseconds (ms) ) . Each radio frame may be identified by a system frame number (SFN) (e.g., ranging from 0 to 1023) .

Each frame may include multiple consecutively-numbered subframes or slots, and each subframe or slot may have the same duration. In some examples, a frame may be divided (e.g., in the time domain) into subframes, and each subframe may be further divided into a quantity of slots. Alternatively, each frame may include a variable quantity of slots, and the quantity of slots may depend on subcarrier spacing. Each slot may include a quantity of symbol periods (e.g., depending on the length of the cyclic prefix prepended to each symbol period) . In some wireless communications systems 100, a slot may further be divided into multiple mini-slots associated with one or more symbols. Excluding the cyclic prefix, each symbol period may be associated with one or more (e.g., N_f) sampling periods. The duration of a symbol period may depend on the subcarrier spacing or frequency band of operation.

A subframe, a slot, a mini-slot, or a symbol may be the smallest scheduling unit (e.g., in the time domain) of the wireless communications system 100 and may be referred to as a transmission time interval (TTI) . In some examples, the TTI duration (e.g., a quantity of symbol periods in a TTI) may be variable. Additionally, or alternatively, the smallest scheduling unit of the wireless communications system 100 may be dynamically selected (e.g., in bursts of shortened TTIs (sTTIs) ) .

Physical channels may be multiplexed for communication using a carrier according to various techniques. A physical control channel and a physical data channel may be multiplexed for signaling via a downlink carrier, for example, using one or more of time division multiplexing (TDM) techniques, frequency division multiplexing (FDM) techniques, or hybrid TDM-FDM techniques. A control region (e.g., a control resource set (CORESET) ) for a physical control channel may be defined by a set of symbol periods and may extend across the system bandwidth or a subset of the system bandwidth of the carrier. One or more control regions (e.g., CORESETs) may be configured for a set of the UEs 115. For example, one or more of the UEs 115 may monitor or search control regions for control information according to one or more search space sets, and each search space set may include one or multiple control channel candidates in one or more aggregation levels arranged in a cascaded manner. An aggregation level for a control channel candidate may refer to an amount of control channel resources (e.g., control channel elements (CCEs) ) associated with encoded information for a control information format having a given payload size. Search space sets may include common search space sets configured for sending control information to multiple UEs 115 and UE-specific search space sets for sending control information to a specific UE 115.

A network entity 105 may provide communication coverage via one or more cells, for example a macro cell, a small cell, a hot spot, or other types of cells, or any combination thereof. The term “cell” may refer to a logical communication entity used for communication with a network entity 105 (e.g., using a carrier) and may be associated with an identifier for distinguishing neighboring cells (e.g., a physical cell identifier (PCID) , a virtual cell identifier (VCID) , or others) . In some examples, a cell also may refer to a coverage area 110 or a portion of a coverage area 110 (e.g., a sector) over which the logical communication entity operates. Such cells may range from smaller areas (e.g., a structure, a subset of structure) to larger areas depending on various factors such as the capabilities of the network entity 105. For example, a cell may be or include a building, a subset of a building, or exterior spaces between or overlapping with coverage areas 110, among other examples. A network entity 105 may support one or multiple cells and may also support communications via the one or more cells using one or multiple component carriers.

In some examples, a carrier may support multiple cells, and different cells may be configured according to different protocol types (e.g., MTC, narrowband IoT (NB-IoT) , enhanced mobile broadband (eMBB) ) that may provide access for different types of devices.

In some examples, a network entity 105 (e.g., a base station 140, an RU 170) may be movable and therefore provide communication coverage for a moving coverage area 110. In some examples, different coverage areas 110 associated with different technologies may overlap, but the different coverage areas 110 may be supported by the same network entity 105. In some other examples, the overlapping coverage areas 110 associated with different technologies may be supported by different network entities 105. The wireless communications system 100 may include, for example, a heterogeneous network in which different types of the network entities 105 provide coverage for various coverage areas 110 using the same or different radio access technologies.

The wireless communications system 100 may be configured to support ultra-reliable communications or low-latency communications, or various combinations thereof. For example, the wireless communications system 100 may be configured to support ultra-reliable low-latency communications (URLLC) . The UEs 115 may be designed to support ultra-reliable, low-latency, or critical functions. Ultra-reliable communications may include private communication or group communication and may be supported by one or more services such as push-to-talk, video, or data. Support for ultra-reliable, low-latency functions may include prioritization of services, and such services may be used for public safety or general commercial applications. The terms ultra-reliable, low-latency, and ultra-reliable low-latency may be used interchangeably herein.

In some examples, a UE 115 may be configured to support communicating directly with other UEs 115 via a device-to-device (D2D) communication link 135 (e.g., in accordance with a peer-to-peer (P2P) , D2D, or sidelink protocol) . In some examples, one or more UEs 115 of a group that are performing D2D communications may be within the coverage area 110 of a network entity 105 (e.g., a base station 140, an RU 170) , which may support aspects of such D2D communications being configured by (e.g., scheduled by) the network entity 105. In some examples, one or more UEs 115 of such a group may be outside the coverage area 110 of a network entity 105 or may be otherwise unable to or not configured to receive transmissions from a network entity 105. In some examples, groups of the UEs 115 communicating via D2D communications may support a one-to-many (1: M) system in which each UE 115 transmits to each of the other UEs 115 in the group. In some examples, a network entity 105 may facilitate the scheduling of resources for D2D communications. In some other examples, D2D communications may be carried out between the UEs 115 without an involvement of a network entity 105.

The core network 130 may provide user authentication, access authorization, tracking, Internet Protocol (IP) connectivity, and other access, routing, or mobility functions. The core network 130 may be an evolved packet core (EPC) or 5G core (5GC) , which may include at least one control plane entity that manages access and mobility (e.g., a mobility management entity (MME) , an access and mobility management function (AMF) ) and at least one user plane entity that routes packets or interconnects to external networks (e.g., a serving gateway (S-GW) , a Packet Data Network (PDN) gateway (P-GW) , or a user plane function (UPF) ) . The control plane entity may manage non-access stratum (NAS) functions such as mobility, authentication, and bearer management for the UEs 115 served by the network entities 105 (e.g., base stations 140) associated with the core network 130. User IP packets may be transferred through the user plane entity, which may provide IP address allocation as well as other functions. The user plane entity may be connected to IP services 150 for one or more network operators. The IP services 150 may include access to the Internet, Intranet (s) , an IP Multimedia Subsystem (IMS) , or a Packet-Switched Streaming Service.

The wireless communications system 100 may operate using one or more frequency bands, which may be in the range of 300 megahertz (MHz) to 300 gigahertz (GHz) . Generally, the region from 300 MHz to 3 GHz is known as the ultra-high frequency (UHF) region or decimeter band because the wavelengths range from approximately one decimeter to one meter in length. UHF waves may be blocked or redirected by buildings and environmental features, which may be referred to as clusters, but the waves may penetrate structures sufficiently for a macro cell to provide service to the UEs 115 located indoors. Communications using UHF waves may be associated with smaller antennas and shorter ranges (e.g., less than 100 kilometers) compared to communications using the smaller frequencies and longer waves of the high frequency (HF) or very high frequency (VHF) portion of the spectrum below 300 MHz.

The wireless communications system 100 may also operate using a super high frequency (SHF) region, which may be in the range of 3 GHz to 30 GHz, also known as the centimeter band, or using an extremely high frequency (EHF) region of the spectrum (e.g., from 30 GHz to 300 GHz) , also known as the millimeter band. In some examples, the wireless communications system 100 may support millimeter wave (mmW) communications between the UEs 115 and the network entities 105 (e.g., base stations 140, RUs 170) , and EHF antennas of the respective devices may be smaller and more closely spaced than UHF antennas. In some examples, such techniques may facilitate using antenna arrays within a device. The propagation of EHF transmissions, however, may be subject to even greater attenuation and shorter range than SHF or UHF transmissions. The techniques disclosed herein may be employed across transmissions that use one or more different frequency regions, and designated use of bands across these frequency regions may differ by country or regulating body.

The wireless communications system 100 may utilize both licensed and unlicensed RF spectrum bands. For example, the wireless communications system 100 may employ License Assisted Access (LAA) , LTE-Unlicensed (LTE-U) radio access technology, or NR technology using an unlicensed band such as the 5 GHz industrial, scientific, and medical (ISM) band. While operating using unlicensed RF spectrum bands, devices such as the network entities 105 and the UEs 115 may employ carrier sensing for collision detection and avoidance. In some examples, operations using unlicensed bands may be based on a carrier aggregation configuration in conjunction with component carriers operating using a licensed band (e.g., LAA) . Operations using unlicensed spectrum may include downlink transmissions, uplink transmissions, P2P transmissions, or D2D transmissions, among other examples.

A network entity 105 (e.g., a base station 140, an RU 170) or a UE 115 may be equipped with multiple antennas, which may be used to employ techniques such as transmit diversity, receive diversity, multiple-input multiple-output (MIMO) communications, or beamforming. The antennas of a network entity 105 or a UE 115 may be located within one or more antenna arrays or antenna panels, which may support MIMO operations or transmit or receive beamforming. For example, one or more base station antennas or antenna arrays may be co-located at an antenna assembly, such as an antenna tower. In some examples, antennas or antenna arrays associated with a network entity 105 may be located at diverse geographic locations. A network entity 105 may include an antenna array with a set of rows and columns of antenna ports that the network entity 105 may use to support beamforming of communications with a UE 115. Likewise, a UE 115 may include one or more antenna arrays that may support various MIMO or beamforming operations. Additionally, or alternatively, an antenna panel may support RF beamforming for a signal transmitted via an antenna port.

The network entities 105 or the UEs 115 may use MIMO communications to exploit multipath signal propagation and increase spectral efficiency by transmitting or receiving multiple signals via different spatial layers. Such techniques may be referred to as spatial multiplexing. The multiple signals may, for example, be transmitted by the transmitting device via different antennas or different combinations of antennas. Likewise, the multiple signals may be received by the receiving device via different antennas or different combinations of antennas. Each of the multiple signals may be referred to as a separate spatial stream and may carry information associated with the same data stream (e.g., the same codeword) or different data streams (e.g., different codewords) . Different spatial layers may be associated with different antenna ports used for channel measurement and reporting. MIMO techniques include single-user MIMO (SU-MIMO) , for which multiple spatial layers are transmitted to the same receiving device, and MU-MIMO, for which multiple spatial layers are transmitted to multiple devices.

Beamforming, which may also be referred to as spatial filtering, directional transmission, or directional reception, is a signal processing technique that may be used at a transmitting device or a receiving device (e.g., a network entity 105, a UE 115) to shape or steer an antenna beam (e.g., a transmit beam, a receive beam) along a spatial path between the transmitting device and the receiving device. Beamforming may be achieved by combining the signals communicated via antenna elements of an antenna array such that some signals propagating along particular orientations with respect to an antenna array experience constructive interference while others experience destructive interference. The adjustment of signals communicated via the antenna elements may include a transmitting device or a receiving device applying amplitude offsets, phase offsets, or both to signals carried via the antenna elements associated with the device. The adjustments associated with each of the antenna elements may be defined by a beamforming weight set associated with a particular orientation (e.g., with respect to the antenna array of the transmitting device or receiving device, or with respect to some other orientation) .

A network entity 105 or a UE 115 may use beam sweeping techniques as part of beamforming operations. For example, a network entity 105 (e.g., a base station 140, an RU 170) may use multiple antennas or antenna arrays (e.g., antenna panels) to conduct beamforming operations for directional communications with a UE 115. Some signals (e.g., synchronization signals, reference signals, beam selection signals, or other control signals) may be transmitted by a network entity 105 multiple times along different directions. For example, the network entity 105 may transmit a signal according to different beamforming weight sets associated with different directions of transmission. Transmissions along different beam directions may be used to identify (e.g., by a transmitting device, such as a network entity 105, or by a receiving device, such as a UE 115) a beam direction for later transmission or reception by the network entity 105.

Some signals, such as data signals associated with a particular receiving device, may be transmitted by transmitting device (e.g., a transmitting network entity 105, a transmitting UE 115) along a single beam direction (e.g., a direction associated with the receiving device, such as a receiving network entity 105 or a receiving UE 115) . In some examples, the beam direction associated with transmissions along a single beam direction may be determined based on a signal that was transmitted along one or more beam directions. For example, a UE 115 may receive one or more of the signals transmitted by the network entity 105 along different directions and may report to the network entity 105 an indication of the signal that the UE 115 received with a highest signal quality or an otherwise acceptable signal quality.

In some examples, transmissions by a device (e.g., by a network entity 105 or a UE 115) may be performed using multiple beam directions, and the device may use a combination of digital precoding or beamforming to generate a combined beam for transmission (e.g., from a network entity 105 to a UE 115) . The UE 115 may report feedback that indicates precoding weights for one or more beam directions, and the feedback may correspond to a configured set of beams across a system bandwidth or one or more sub-bands. The network entity 105 may transmit a reference signal (e.g., a cell-specific reference signal (CRS) , a CSI-RS (CSI-RS) ) , which may be precoded or unprecoded. The UE 115 may provide feedback for beam selection, which may be a precoding matrix indicator (PMI) or codebook-based feedback (e.g., a multi-panel type codebook, a linear combination type codebook, a port selection type codebook) . Although these techniques are described with reference to signals transmitted along one or more directions by a network entity 105 (e.g., a base station 140, an RU 170) , a UE 115 may employ similar techniques for transmitting signals multiple times along different directions (e.g., for identifying a beam direction for subsequent transmission or reception by the UE 115) or for transmitting a signal along a single direction (e.g., for transmitting data to a receiving device) .

A receiving device (e.g., a UE 115) may perform reception operations in accordance with multiple receive configurations (e.g., directional listening) when receiving various signals from a transmitting device (e.g., a network entity 105) , such as synchronization signals, reference signals, beam selection signals, or other control signals. For example, a receiving device may perform reception in accordance with multiple receive directions by receiving via different antenna subarrays, by processing received signals according to different antenna subarrays, by receiving according to different receive beamforming weight sets (e.g., different directional listening weight sets) applied to signals received at multiple antenna elements of an antenna array, or by processing received signals according to different receive beamforming weight sets applied to signals received at multiple antenna elements of an antenna array, any of which may be referred to as “listening” according to different receive configurations or receive directions. In some examples, a receiving device may use a single receive configuration to receive along a single beam direction (e.g., when receiving a data signal) . The single receive configuration may be aligned along a beam direction determined based on listening according to different receive configuration directions (e.g., a beam direction determined to have a highest signal strength, highest signal-to-noise ratio (SNR) , or otherwise acceptable signal quality based on listening according to multiple beam directions) .

The wireless communications system 100 may be a packet-based network that operates according to a layered protocol stack. In the user plane, communications at the bearer or PDCP layer may be IP-based. An RLC layer may perform packet segmentation and reassembly to communicate via logical channels. A MAC layer may perform priority handling and multiplexing of logical channels into transport channels. The MAC layer also may implement error detection techniques, error correction techniques, or both to support retransmissions to improve link efficiency. In the control plane, an RRC layer may provide establishment, configuration, and maintenance of an RRC connection between a UE 115 and a network entity 105 or a core network 130 supporting radio bearers for user plane data. A PHY layer may map transport channels to physical channels.

A QCL relationship between one or more transmissions or signals may refer to a relationship between the antenna ports (and the corresponding signaling beams) of the respective transmissions. For example, one or more antenna ports may be implemented by a network entity 105 for transmitting at least one or more reference signals (such as a downlink reference signal, a synchronization signal block (SSB) , or the like) and control information transmissions to a UE 115. However, the channel properties of signals sent via the different antenna ports may be interpreted (e.g., by a receiving device) to be the same (e.g., despite the signals being transmitted from different antenna ports) , and the antenna ports (and the respective beams) may be described as being quasi co-located (QCLed) . QCLed signals may enable the UE 115 to derive the properties of a first signal (e.g., delay spread, Doppler spread, frequency shift, average power) transmitted via a first antenna port from measurements made on a second signal transmitted via a second antenna port. Put another way, if two antenna ports are categorized as being QCLed in terms of, for example, delay spread then the UE 115 may determine the delay spread for one antenna port (e.g., based on a received reference signal, such as CSI-RS) and then apply the result to both antenna ports. Such techniques may avoid the UE 115 determining the delay spread separately for each antenna port. In some cases, two antenna ports may be said to be spatially QCLed, and the properties of a signal sent over a directional beam may be derived from the properties of a different signal over another, different directional beam. That is, QCL relationships may relate to beam information for respective directional beams used for communications of various signals.

Different types of QCL relationships may describe the relationship between two different signals or antenna ports. For instance, QCL-TypeA may refer to a QCL relationship between signals including Doppler shift, Doppler spread, average delay, and delay spread. QCL-TypeB may refer to a QCL relationship including Doppler shift and Doppler spread, whereas QCL-TypeC may refer to a QCL relationship including Doppler shift and average delay. A QCL-TypeD may refer to a QCL relationship of spatial parameters, which may indicate a relationship between two or more directional beams used to communicate signals. Here, the spatial parameters may indicate that a first beam used to transmit a first signal may be similar (or the same) as another beam used to transmit a second, different, signal, or, that the same receive beam may be used to receive both the first and the second signal. Thus, the beam information for various beams may be derived through receiving signals from a transmitting device, where, in some cases, the QCL information or spatial information may help a receiving device efficient identify communications beams (e.g., without having to sweep through a large quantity of beams to identify a beam (e.g., the beam having a highest signal quality) ) . In addition, QCL relationships may exist for both uplink and downlink transmissions and, in some cases, a QCL relationship may also be referred to as spatial relationship information.

In some examples, TCI states may include one or more parameters associated with a QCL relationship between transmitted signals. For example, each TCI state includes parameters for configuring a QCL relationship between one or two downlink reference signals and the demodulation reference signal (DMRS) ports of physical downlink control channel (PDSCH) , the DMRS port of PDCCH or the CSI-RS port (s) of a CSI-RS resource. The QCL relationship is configured by a first higher layer parameter for the first downlink reference signal, and by a second higher layer parameter for the second downlink reference signal (if configured) . That is, a network entity 105 may configure a QCL relationship that provides a mapping between a reference signal and antenna ports of another signal, and the TCI state may be indicated to the UE 115 by the network entity 105. In some cases, a set of TCI states (e.g., a list of TCI states) may be indicated to a UE 115 via RRC signaling, where some quantity of TCI states may be configured via RRC and one or more TCI states may be indicated (e.g., activated) via a MAC-control element (MAC-CE) , and further indicated via DCI (e.g., within a CORESET) . The QCL relationship associated with the TCI state (and further established through higher-layer parameters) may provide the UE 115 with the QCL relationship for respective antenna ports and reference signals transmitted by the network entity 105.

In the wireless communications system 100, a network entity 105 may transmit CSI-RSs to a UE 115. The UE 115 may perform measurements on the CSI-RSs and may generate a CSI report based on the measurements of the CSI-RSs. The UE 115 may transmit the CSI report to the network entity 105 such that the network entity 105 may identify suitable configurations for communications with the UE 115. For example, a CSI report may include an indication of a CRI by which the UE 115 indicates a subset of CSI-RS resource from configured CSI-RS resources via which the CSI-RSs are received. In some examples, CRI may be used for precoding with hybrid beamforming, as each CSI-RS resource may correspond to one analog beam.

The network entity 105 may use a set of multiple antenna ports to transmit the CSI-RSs (e.g., antenna ports corresponding to antenna elements of an antenna array of the network entity 105) . The use of more CSI ports at the network entity 105 allows for smaller beams, and therefore more accurate channel estimation and more precise beam selection. Some CSI codebooks, such as for 5G massive MIMO, may support up to 32 antenna ports. For example, for low-band FR1, CSI-RSs are generally transmitted using a low quantity of antenna ports (e.g., 2 or 4 ports) based on a relatively limited antenna array size. For frequency range 2 (FR2) and above (e.g., 28 GHz and above) , CSI-RSs may be transmitted using a small quantity of antenna ports (e.g., 2 or 4 ports) due to hardware cost. Further, small quantities of antenna ports may be operable for narrow analog beams implemented using large phased-arrays (e.g., 1024 antenna elements) . Larger quantities of antenna ports may be used for middle bands such as higher FR1 (e.g., 3–6 GHz) or FR3 (e.g., 7–24 GHz) . In some examples, middle bands may use more than 32 antenna ports for transmission of CSI-RS (e.g., 128-TXRU with 64-port or 128-port CSI-RS may be supported) . Middle bands may be deployed with more than one analog beam (e.g., 4 or more) for hybrid beamforming.

CSI configurations for more than 32 antenna ports may aggregate CSI-RS resources (e.g., 128 port CSI may be supported as four 32 port CSI-RS resources) to avoid updates to CSI-RS resources and/or configurations associated with greater than 32 antenna ports. For example, more antenna elements (per TXRU) may be used for analog beamforming at higher bands (e.g., 6–7 GHz) to provide better coverage. The use of more antenna elements may result in narrower beams, thus resulting in an increase in the quantity of beams. The wireless communications system 100 may implement MU-MIMO. The network may schedule or pair UEs 115 for MU-MIMO based on the UEs 115 reporting a same beam (e.g., based on the reported CRI) . With smaller and therefore more beams, if each UE 115 reports a single beam, it may be less likely that different UEs 115 will report the same beam, and thus less likely for UEs 115 to be paired or scheduled for MU-MIMO.

Accordingly, in some examples, UEs 115 may report one or more CRIs (e.g., subsets of CSI-RS resources) . Groups of CSI-RS resources may be indicated to the UEs 115, where each group of CSI-RSs is associated with the same antenna port indices at the network entity to support CSI-RS resource aggregation. Each subset of CSI-RS resources may include one CSI-RS resource from each of the groups and each subset of CSI-RS resources may be associated with a same beam (e.g., TCI state and same QCL source reference signal) . As each subset of CSI-RS resources is associated with the same beam, by reporting multiple subsets of CSI-RS resources (e.g., more than one CRI) , a UE 115 may be more likely to be paired or scheduled for MU-MIMO, thus increasing network efficiency.

FIG. 2 shows an example of a wireless communications system 200 that supports CRI for aggregated CSI-RS resources in accordance with one or more aspects of the present disclosure. The wireless communications system 200 may implement or may be implemented by aspects of the wireless communications system 100. For example, the wireless communications system 200 may include a UE 115-a, which may be an example of a UE 115 as described herein. The wireless communications system 200 may include a network entity 105-a, which may be an example of a network entity 105 as described herein.

The UE 115-a may communicate with the network entity 105-a using a communication link 125-a. The communication link 125-a may be an example of an NR or LTE link between the UE 115-a and the network entity 105-a. The communication link 125-a may include a bi-directional link that enable both uplink and downlink communications. For example, the UE 115-a may transmit uplink signals 205 (e.g., uplink transmissions) , such as uplink control signals or uplink data signals, to the network entity 105-a using the communication link 125-a and the network entity 105-a may transmit downlink signals 210 (e.g., downlink transmissions) , such as downlink control signals or downlink data signals, to the UE 115-a using the communication link 125-a.

The network entity 105-a may transmit control signaling 225 that schedules a set of CSI-RSs 230. The control signaling 225 may configure a CSI report codebook and parameters for a CSI report for the set of CSI-RSs. For example, the control signaling 225 may be RRC signaling. For example, the control signaling 225 may include an RRC information element (IE) CSI-ReportConfig which may indicate a configuration for CSI reporting, where the configuration may indicate a set of CSI-RS resources and reporting configurations (e.g., which reporting quantities to include in a CSI report) .

The UE 115-a may measure the set of CSI-RSs 230 received via the set of configured CSI-RS resources and generate a CSI report based on the set of CSI-RSs 230. The UE 115-a may transmit an uplink control message 240 to the network entity 105-a that may include the CSI report such that the network entity 105-a may identify suitable configurations for communications with the UE 115-a (e.g., for communication of downlink signals 210 such as physical downlink control channels (PDCCHs) and PDSCHs) . For example, the uplink control message 240 may be an uplink control information (UCI) transmitted via a physical uplink control channel (PUCCH) .

The network entity 105-a may use a quantity of antenna ports 255 to transmit the set of CSI-RSs 230. The network entity 105-a may use beamforming techniques to transmit the set of CSI-RSs 230 via a quantity of beams 215 (e.g., a beam 215-a, a beam 215-b, and a beam 215-c as shown in FIG. 2) using the quantity of antenna ports 255. The UE 115-a may receive the set of CSI-RSs 230 via a quantity of receive beams 220 (e.g., a beam 220-a, a beam 220-b, and a beam 220-c as shown in FIG. 2) at the UE 115-a. As shown, the network entity 105-a may use an antenna array to transmit the CSI-RSs that includes N₁ antenna ports 255 in a first dimension (e.g., a horizontal direction) and N₂ antenna ports 255 in a second dimension (e.g., a vertical dimension) . The quantity of antenna ports used to transmit the CSI-RSs may be given by 2N₁N₂. In some examples, the control signaling 225 may indicate the values of N₁ and N₂. For example, N₁ and N₂ may be indicated in the RRC IE codebookConfig within the RRC IE CSI-ReportConfig.

In some examples, the control signaling 225 may indicate N groups of CSI-RS resources and K subsets of CSI-RS resources (e.g., there may be a total of NK CSI-RS resources in the set of configured CSI-RS resources) , where N is greater than 1. Each subset may include N CSI-RS resources and may include one CSI-RS resource from each of the N groups. CSI-RS resources within a same group may have the same antenna port indices, which may be indicated in the control signaling 225. For example, CSI-RS resources in a first group may be associated with a same set of antenna port indices (e.g., CSI-RS resources of Group 0 may share antenna port indices 3000, 3001, ...3031, respectively) and CSI-RS resources in a second, different group may be associated with another set of the same antenna port indices (e.g., CSI-RS resources of Group 1 may correspond to antenna port indices 3032, 3033, ... 3063, respectively) , and so forth.

CSI-RS resources in the same subset may have a same TCI state (e.g., a same QCL type A relation and/or QCL type B relation) . For example, CSI-RS resources in the same subset may be sourced to a same reference signal (e.g., SSB, tracking reference signal (TRS) , or beam management CSI-RS (BM-CSI-RS) ) . Accordingly, each CSI-RS resource in a same subset may be associated with a same analog beam. Each CSI-RS resource in the set of NK CSI-RS resources may be associated with a same quantity of antenna ports at the network entity 105-a, P. For example, P=32 means that each CSI-RS resource is associated with 32 ports. Thus, a total quantity of antenna ports (2N₁N₂) may be equal to NP.

In some examples, each of the CSI-RS resources within a same subset may have the same power offset values. For example, each of the CSI-RS resources within a same subset may have a same value of the field powerControlOffset (e.g., the PDSCH to CSI-RS energy per resource element (EPRE) ) and/or the same value of the field powerControlOffsetSS (e.g., CSI-RS to SSB EPRE) , where the fields powerControlOffset and powerControlOffsetSS may be indicated per CSI-RS resource in the control signaling 225.

In some examples, each of the CSI-RS resources within a same subset may be scheduled in a same resource block (RB) (e.g., when frequency density of 0.5 resource elements (REs) per port per RB is configured) . In some examples, each of the CSI-RS resources within a same subset may be scheduled within a threshold duration, where the threshold duration does not include an uplink/downlink switch (e.g., within the same slot or the same two consecutive slots) . For periodic or semi-persistent CSI-RS, each of the CSI-RS resources within a same subset may have the same periodicity, and the offset of the CSI-RS resources in a same subset within a periodicity may satisfy (e.g., be less than or equal to) the threshold duration. For aperiodic CSI-RS, the triggering offset of the CSI-RS resources in a same subset may satisfy (e.g., be less than or equal to) the threshold duration.

The UE 115-a may indicate in the uplink control message 240 one or more of the K subsets, for example, via CRI. In some cases, the UE 115-a may indicate a single subset out of the K subsets (e.g., as a baseline) . Indication of a single subset may involve log₂K bits in the uplink control message 240.

In some examples, for example, to increase the likelihood of MU-MIMO scheduling, the UE 115-a may indicate more than one subset. For example, the network entity 105-a may indicate in the control signaling 225 or in separate control signaling, a pre-configured quantity of subsets for the UE 115-a to report, X, where X>1. Indication of X subsets, where the quantity X is preconfigured, may involvebits in the uplink control message 240. As another example, the network entity 105-a may indicate in the control signaling 225 or in separate control signaling, a threshold (e.g., maximum) quantity of subsets for the UE 115-a to report, X, where X>1. In such examples, the UE 115-a may indicate up to X subsets in the uplink control message 240, and the indication of up to X subsets may involvebits in the uplink control message 240.

In some examples, where the UE 115-a indicates more than one subset (e.g., the UE indicates multiple CRIs) , the UE 115-a may include multiple CSI reports. For example, the UE 115-a may include a CSI report for each subset (e.g., a respective rank, channel quality index (CQI) , precoding matrix indicator (PMI) , and/or layer indicator (LI) for each indicated subset) .

In some cases, where the quantity of CRIs is variable (e.g., where a threshold quantity of subsets is configured and the UE 115-a may report up to the threshold quantity) , two stage reporting may be used, as the payload size of the uplink control message 240 may depend on the quantity of subsets reported. For example, the UE 115-a may transmit a second uplink control message 235 prior to the uplink control message 240, where the second uplink control message indicates the quantity of subsets the UE 115-a will report and/or the CRIs, and the uplink control message 240 includes the indication of the subsets (e.g., the CRIs) and/or any respective CSI reports for the indicated subsets. For example, the second uplink control message 235 may be a MAC-CE. As another example, the UE 115-a may report CRIs with a first periodicity (e.g., for periodic or semi-persistent CSI-RS) , and the reported CRIs may indicate how many CSI reports are expected for each CSI reporting occasion (e.g., based on the quantity of CRIs where each CRI is associated with a respective CSI report) . In such examples, a next period may include a different quantity of CRIs and CRI reports. In some examples, the UE 115-a may report CRIs via a MAC-CE (e.g., for periodic or semi-persistent CSI-RS) , and the reported CRIs may indicate how many CSI reports are expected for each CSI reporting occasion (e.g., based on the quantity of CRIs where each CRI is associated with a respective CSI report) until the UE 115-a transmits another MAC-CE indicating an updated set of CRIs.

In some examples, one of the two dimensions of the antenna panel at the network entity 105-a may be divided or split equally into N multiples (e.g., N= 2, 3, or 4) for port indexing of N CSI-RS resources, respectively. For example, table 1 shows a quantity of antenna ports for given values of N₁ and N₂, where the quantity of antenna ports is equal to 2N₁N₂ as the antenna ports have 2 polarizations. Each of the N CSI-RS resources may include antenna ports of both polarizations. The control signaling 225 may indicate a first dimension size (e.g., either N₁ or N₂) associated with the CSI report setting for the CSI-RS resources and a second dimension size (e.g., the other of N₁ or N₂) associated with the CSI report setting, and the first dimension may be split equally into a quantity of N multiples for CSI-RS port indexing of the groups of CSI-RS resources. For example, N₁ and N₂ and the N₁ or N₂ dimension split may be indicated via the RRC IE codebookConfig within the RRC IE CSI-ReportConfig.

Table 1

For example, the port index p∈ {0, 1, ..., NP-1} within a subset (for CSI-RS resource n = 0, 1, ..., N-1 within a subset, and code division multiplexing (CDM) -related indices within this resource n: CDM group index (where L_n is the CDM group size, which can be common for all CSI-RS resource i.e., L_n=L for all n = 0, 1, ..., N-1) ; and the index within this CDM group j: s_n=0, 1, ..., L_n-1) . In such examples, for an N₁ dimension split (e.g., the first dimension is N₁) , and for an N₂ dimension split (e.g., the first dimension is N₂) , p=3000+ (j_nL_n+s_n) N+n. For example, an indexing scheme for an N₁ dimension split may be shown in FIG. 4 and an indexing scheme for an N₂ dimension split may be shown in FIG. 5.

FIG. 3 shows an example of a CSI-RS resource diagram 300 that supports CRI for aggregated CSI-RS resources in accordance with one or more aspects of the present disclosure. The CSI-RS resource diagram 300 may implement or may be implemented by aspects of the wireless communications system 100 or the wireless communications system 200. The CSI-RS resource diagram 300 illustrates respective sets of CSI-RS resources 305, which may correspond to or be included within multiple CSI-RS resource groups 310 (e.g., a first group 310-a (Group 0) , a second group 310-b (Group 1) , a third group 310-c (Group 2) , through an nth group 310-n (Group N-1) ) and multiple CSI-RS resource subsets 315 (e.g., a first subset 315-a (Subset 0) , a second subset 315-b (Subset 1) , a third subset 315-c (Subset 2) , through a kth subset 315-k (Subset K-1) ) .

As described herein, control signaling (e.g., the control signaling 225 of FIG. 2) may indicate to a UE 115 a set of CSI-RS resources that includes N groups of CSI-RS resources and K subsets of CSI-RS resources (e.g., there may be a total of NK CSI-RS resources in a set of configured CSI-RS resources) . For example, FIG. 3 shows N groups of CSI-RS resources and K subsets of CSI-RS resources, where each of the K subsets includes one CSI-RS resource from each of the N groups. Each CSI-RS resource in each of the groups may be associated with a set of antenna port indices at the network entity. For instance, in the example of aggregated CSI-RS resources for 32 antenna ports, group 310-a may be associated with antenna port indices 3000–3031, group 310-b may be associated with antenna port indices 3032–3063, group 310-c may be associated with antenna port indices 3064–3095, and group 310-n (e.g., where N=4) may be associated with antenna port indices 3096–3127. As described herein, each CSI-RS resource may be associated with an equal quantity of antenna ports at the network entity. As described herein, each group may include a different quantity of antenna port indices, and the 32-port examples should not be considered limiting to the claims or the description.

A UE may receive a set of CSI-RSs via the set of NK CSI-RS resources. Based on the CSI-RSs, the UE 115-a may report one or more CRIs (e.g., may report one or more subsets 315 of CSI-RS resources from among the K configured subsets) .

FIG. 4 shows an example of a port indexing scheme 400 that supports CRI for aggregated CSI-RS resources in accordance with one or more aspects of the present disclosure. The port indexing scheme 400 may implement or may be implemented by aspects of the wireless communications system 100 or the wireless communications system 200.

As described herein, in some examples, one of the two dimensions of the antenna panel at the network entity 105 may be divided or split equally into N multiple (e.g., N= 2, 3, or 4) for port indexing of N CSI-RS resources. For example, the port indexing scheme 400 may be used for an N₁ dimension split (e.g., horizontal dimension split) . In the example of FIG. 4, N=4 (e.g., there are 4 CSI-RS resources per subset) , and as shown each CSI-RS resource (e.g., the CSI-RS resource #0, the CSI-RS resource #1, the CSI-RS resource #2, and the CSI-RS resource #3) includes 32 ports (e.g., P=32) . In the example of FIG. 4, each CSI-RS resource has a same resource pattern, and the CDM group size L=8, and thus P/L=4 CDM groups.

As shown in FIG. 4, in the port indexing scheme 400, N₁ dimension indices may extend from 0–15 and N₂ dimension indices may extend from 0–3 across two polarizations (polarization #0 and polarization #1) . Accordingly, based on (where N=4, P=32, L=8, s_n= 0, 1, …, L-1) , the antenna port indices may be indexed from 0–127 as shown in FIG. 4 (with “3000+” omitted) . In an N₁ dimension split, CSI-RS resources may be split evenly across each N₁ dimension indices (e.g., each CSI-RS includes four N₁ indices) and each CSI-RS resource may include all of the indices of the N₂ dimension (e.g., 0–3) across both polarizations (e.g., polarization #0 and polarization #1) . Although the port indices illustrated by FIG. 4 correspond to examples of index values, different index values may be used for indexing antenna ports for aggregated CSI-RS resources. As one example, 3000 may be added to each antenna port (CSI-RS port) index value shown in the port indexing scheme (e.g., an index of 0 in the port indexing scheme 400 may be equivalent to an index of 3000, an index of 16 in the port indexing scheme 400 may be equivalent to an index of 3016, an index of 96 in the port indexing scheme 400 may be equivalent to an index of 3096, and so forth) . Other index values may be used, and the examples described herein should not be considered limiting to the scope of the claims or the disclosure.

FIG. 5 shows an example of a port indexing scheme 500 that supports CRI for aggregated CSI-RS resources in accordance with one or more aspects of the present disclosure. The port indexing scheme 500 may implement or may be implemented by aspects of the wireless communications system 100 or the wireless communications system 200.

As described herein, in some examples, one of the two dimensions of the antenna panel at the network entity 105 may be divided or split equally into N multiple (e.g., N= 2, 3, or 4) for port indexing of N CSI-RS resources. For example, the port indexing scheme 500 may be used for an N₂ dimension split (e.g., vertical dimension split) . In the example of FIG. 5, N=4 (e.g., there are 4 CSI-RS resources per subset) , and as shown each CSI-RS resource (e.g., the CSI-RS resource #0, the CSI-RS resource #1, the CSI-RS resource #2, and the CSI-RS resource #3) includes 32 ports (e.g., P=32) . In the example of FIG. 5, each CSI-RS resource has a same resource pattern, and the CDM group size L=8, and thus P/L=4 CDM groups.

As shown in FIG. 5, in the port indexing scheme 500, N₂ dimension indices may extend from 0–3 and N₁ dimension indices may extend from 0–15 across two polarizations (polarization #0 and polarization #1) . Accordingly, based on p=3000+ (j_nL+s_n) N+n (where N=4, P=32, L=8, s_n=0, 1, …, L-1) , the antenna port indices may be indexed from 0–127 as shown in FIG. 5 (with “3000+” omitted) . In an N₂ dimension split, CSI-RS resources may be split evenly across each N₂ dimension indices (e.g., each CSI-RS includes one N₂ index) and each CSI-RS resource may include all of the indices of the N₁ dimension (e.g., 0–15) across both polarizations (e.g., polarization #0 and polarization #1) .

Although the port indices illustrated by FIG. 5 correspond to examples of index values, different index values may be used for indexing antenna ports for aggregated CSI-RS resources. For example, 3000 may be added to each antenna port (CSI-RS port) index value shown in the port indexing scheme (e.g., an index of 0 in the port indexing scheme 500 may be equivalent to an index of 3000, an index of 64 in the port indexing scheme 500 may be equivalent to an index of 3064, an index of 127 in the port indexing scheme 500 may be equivalent to an index of 3127, and so forth) . Other index values may be used, and the examples described herein should not be considered limiting to the scope of the claims or the disclosure.

FIG. 6 shows an example of a process flow 600 that supports CRI for aggregated CSI-RS resources in accordance with one or more aspects of the present disclosure. The process flow 600 may implement or be implemented by aspects of wireless communications system 100 or the wireless communications system 200. For example, the process flow 600 may include a UE 115-b, which may be an example of a UE 115 as described herein. The process flow 600 may also include a network entity 105-b, which may be an example of a network entity 105 as described herein. In the following description of the process flow 600, the operations between the network entity 105-b and the UE 115-b may be transmitted in a different order than the example order shown, or the operations performed by the network entity 105-b and the UE 115-b may be performed in different orders or at different times. Some operations may also be omitted from the process flow 600, and other operations may be added to the process flow 600.

At 605, the network entity 105-b may transmit, to the UE 115-b, control signaling indicating a set of CSI-RS resources. The set of CSI-RSs may include a set of multiple groups of CSI-RS resources and each group of the set of multiple groups may be associated with a respective set of antenna port indices at the network entity 105-b. For example, each CSI-RS resource in the same group may be associated with the same set of antenna port indices at the network entity 105-b. The set of CSI-RSs may include a set of multiple subsets of CSI-RS resources and each subset of CSI-RS resources may include one CSI-RS resource from each group. In some examples, each subset of CSI-RS resources may be associated with a respective TCI state and a respective QCL source reference signal (e.g., SSB, TRS, or CSI-RS) . For example, each CSI-RS resource in the same subset may be associated with the same TCI state and a QCL source reference signal. In some examples, the control signaling at 605 may be RRC signaling.

In some examples, the control signaling may indicate a same respective power offset value for each CSI-RS resource within a same subset of CSI-RS resources. For example, the power offset value may be a powerControlOffset and/or a powerControlOffsetSS. In some examples, the control signaling may indicate a same respective RB for each CSI-RS resource within a same subset of CSI-RS resources. In some examples, each CSI-RS resource within a same subset of CSI-RS resources is scheduled within a threshold duration without a switch between downlink and uplink (e.g., without a switch between uplink and downlink slots or symbols) .

In some examples, the control signaling may indicate a first dimension size N₁ associated with a CSI report setting (e.g., an RRC IE codebookConfig under an RRC IE CSI-ReportConfig) and a second dimension size N₂ associated with the CSI report setting. The first dimension size may be split equally into a quantity of multiples for CSI-RS port indexing of the plurality of groups of CSI-RS resources. In some examples, the first dimension size is one of a horizontal dimension size or a vertical dimension size. In some examples, each respective set of antenna port indices includes one or more antenna ports of a first polarization and one or more antenna ports of a second polarization.

At 610, the network entity 105-b may transmit, to the UE 115-b, a set of CSI-RSs via the set of CSI-RS resources. In some examples, the total quantity of antenna ports at the network entity used to transmit the set of CSI-RSs is greater than 32.

At 615, the UE 115-b may transmit, to the network entity 105-b based on the set of CSI-RSs, an uplink control message indicating one or more subsets of the set of multiple subsets of CSI-RS resources. In some examples, the uplink control message may be UCI.

In some examples, the UE 115-b may receive second control signaling indicating preconfigured quantity of subsets to report, and the quantity of the one or more subsets of the set of multiple subsets indicated by the uplink control message is equal to the preconfigured quantity of subsets. In some examples, the second control signaling may be RRC signaling. In some examples, the second control signaling may be the same signaling (e.g., same RRC message or same RRC IE) as the first control signaling. In some examples, the second control signaling may be different signaling than the first control signaling (e.g., different RRC messages or different RRC IEs) .

In some examples, the UE 115-b may receive second control signaling indicating a threshold quantity of subsets to report, and a quantity of the one or more subsets indicated by the uplink control message is less than or equal to the threshold quantity of subsets. In some examples, the second control signaling may be RRC signaling. In some examples, the second control signaling may be the same signaling (e.g., same RRC message or same RRC IE) as the first control signaling. In some examples, the second control signaling may be different signaling than the first control signaling (e.g., different RRC messages or different RRC IEs) .

In some examples, the uplink control message may include a respective channel state feedback report (e.g., CSI report) for each of the one or more subsets, where the quantity of the one or more subsets is greater than 1. For example, the UE 115-b may indicate a rank, CQI, PMI, and/or LI for each of the reported subsets. In some examples, the UE 115-b may transmit, prior to transmission of the uplink control message at 615, another control message indicating the quantity of subsets that the UE 115-b will report in the uplink control message. In some examples, the other uplink control message indicates respective quantities of subsets for each of a set of multiple of channel state feedback reporting occasions and the uplink control message is one of the set of multiple of channel state feedback reporting occasions. In some examples, the other uplink control message may be transmitted via a MAC-CE.

FIG. 7 shows a block diagram 700 of a device 705 that supports CRI for aggregated CSI-RS resources in accordance with one or more aspects of the present disclosure. The device 705 may be an example of aspects of a UE 115 as described herein. The device 705 may include a receiver 710, a transmitter 715, and a communications manager 720. The device 705, or one or more components of the device 705 (e.g., the receiver 710, the transmitter 715, and the communications manager 720) , may include at least one processor, which may be coupled with at least one memory, to, individually or collectively, support or enable the described techniques. Each of these components may be in communication with one another (e.g., via one or more buses) .

The receiver 710 may provide a means for receiving information such as packets, user data, control information, or any combination thereof associated with various information channels (e.g., control channels, data channels, information channels related to CRI for aggregated CSI-RS resources) . Information may be passed on to other components of the device 705. The receiver 710 may utilize a single antenna or a set of multiple antennas.

The transmitter 715 may provide a means for transmitting signals generated by other components of the device 705. For example, the transmitter 715 may transmit information such as packets, user data, control information, or any combination thereof associated with various information channels (e.g., control channels, data channels, information channels related to CRI for aggregated CSI-RS resources) . In some examples, the transmitter 715 may be co-located with a receiver 710 in a transceiver module. The transmitter 715 may utilize a single antenna or a set of multiple antennas.

The communications manager 720, the receiver 710, the transmitter 715, or various combinations thereof or various components thereof may be examples of means for performing various aspects of CRI for aggregated CSI-RS resources as described herein. For example, the communications manager 720, the receiver 710, the transmitter 715, or various combinations or components thereof may be capable of performing one or more of the functions described herein.

In some examples, the communications manager 720, the receiver 710, the transmitter 715, or various combinations or components thereof may be implemented in hardware (e.g., in communications management circuitry) . The hardware may include at least one of a processor, a digital signal processor (DSP) , a central processing unit (CPU) , an application-specific integrated circuit (ASIC) , a field-programmable gate array (FPGA) or other programmable logic device, a microcontroller, discrete gate or transistor logic, discrete hardware components, or any combination thereof configured as or otherwise supporting, individually or collectively, a means for performing the functions described in the present disclosure. In some examples, at least one processor and at least one memory coupled with the at least one processor may be configured to perform one or more of the functions described herein (e.g., by one or more processors, individually or collectively, executing instructions stored in the at least one memory) .

Additionally, or alternatively, the communications manager 720, the receiver 710, the transmitter 715, or various combinations or components thereof may be implemented in code (e.g., as communications management software or firmware) executed by at least one processor. If implemented in code executed by at least one processor, the functions of the communications manager 720, the receiver 710, the transmitter 715, or various combinations or components thereof may be performed by a general-purpose processor, a DSP, a CPU, an ASIC, an FPGA, a microcontroller, or any combination of these or other programmable logic devices (e.g., configured as or otherwise supporting, individually or collectively, a means for performing the functions described in the present disclosure) .

In some examples, the communications manager 720 may be configured to perform various operations (e.g., receiving, obtaining, monitoring, outputting, transmitting) using or otherwise in cooperation with the receiver 710, the transmitter 715, or both. For example, the communications manager 720 may receive information from the receiver 710, send information to the transmitter 715, or be integrated in combination with the receiver 710, the transmitter 715, or both to obtain information, output information, or perform various other operations as described herein.

The communications manager 720 may support wireless communications in accordance with examples as disclosed herein. For example, the communications manager 720 is capable of, configured to, or operable to support a means for receiving, from a network entity, control signaling indicating a set of CSI-RS resources, where the set of CSI-RS resources includes a set of multiple groups of CSI-RS resources, each group of the set of multiple groups is associated with a respective set of antenna port indices at the network entity, where the set of CSI-RS resources includes a set of multiple subsets of CSI-RS resources, and where each subset of CSI-RS resources includes one CSI-RS resource from each group. The communications manager 720 is capable of, configured to, or operable to support a means for receiving, from the network entity, a set of CSI-RSs via the set of CSI-RS resources. The communications manager 720 is capable of, configured to, or operable to support a means for transmitting, to the network entity based on the set of CSI-RSs, an uplink control message indicating one or more subsets of the set of multiple subsets of CSI-RS resources.

By including or configuring the communications manager 720 in accordance with examples as described herein, the device 705 (e.g., at least one processor controlling or otherwise coupled with the receiver 710, the transmitter 715, the communications manager 720, or a combination thereof) may support techniques for more efficient utilization of communication resources.

FIG. 8 shows a block diagram 800 of a device 805 that supports CRI for aggregated CSI-RS resources in accordance with one or more aspects of the present disclosure. The device 805 may be an example of aspects of a device 705 or a UE 115 as described herein. The device 805 may include a receiver 810, a transmitter 815, and a communications manager 820. The device 805, or one or more components of the device 805 (e.g., the receiver 810, the transmitter 815, and the communications manager 820) , may include at least one processor, which may be coupled with at least one memory, to support the described techniques. Each of these components may be in communication with one another (e.g., via one or more buses) .

The receiver 810 may provide a means for receiving information such as packets, user data, control information, or any combination thereof associated with various information channels (e.g., control channels, data channels, information channels related to CRI for aggregated CSI-RS resources) . Information may be passed on to other components of the device 805. The receiver 810 may utilize a single antenna or a set of multiple antennas.

The transmitter 815 may provide a means for transmitting signals generated by other components of the device 805. For example, the transmitter 815 may transmit information such as packets, user data, control information, or any combination thereof associated with various information channels (e.g., control channels, data channels, information channels related to CRI for aggregated CSI-RS resources) . In some examples, the transmitter 815 may be co-located with a receiver 810 in a transceiver module. The transmitter 815 may utilize a single antenna or a set of multiple antennas.

The device 805, or various components thereof, may be an example of means for performing various aspects of CRI for aggregated CSI-RS resources as described herein. For example, the communications manager 820 may include a CSI-RS resource manager 825, a CSI-RS reception manager 830, a CRI manager 835, or any combination thereof. The communications manager 820 may be an example of aspects of a communications manager 720 as described herein. In some examples, the communications manager 820, or various components thereof, may be configured to perform various operations (e.g., receiving, obtaining, monitoring, outputting, transmitting) using or otherwise in cooperation with the receiver 810, the transmitter 815, or both. For example, the communications manager 820 may receive information from the receiver 810, send information to the transmitter 815, or be integrated in combination with the receiver 810, the transmitter 815, or both to obtain information, output information, or perform various other operations as described herein.

The communications manager 820 may support wireless communications in accordance with examples as disclosed herein. The CSI-RS resource manager 825 is capable of, configured to, or operable to support a means for receiving, from a network entity, control signaling indicating a set of CSI-RS resources, where the set of CSI-RS resources includes a set of multiple groups of CSI-RS resources, each group of the set of multiple groups is associated with a respective set of antenna port indices at the network entity, where the set of CSI-RS resources includes a set of multiple subsets of CSI-RS resources, and where each subset of CSI-RS resources includes one CSI-RS resource from each group. The CSI-RS reception manager 830 is capable of, configured to, or operable to support a means for receiving, from the network entity, a set of CSI-RSs via the set of CSI-RS resources. The CRI manager 835 is capable of, configured to, or operable to support a means for transmit, to the network entity based on the set of CSI-RSs, an uplink control message indicating one or more subsets of the set of multiple subsets of CSI-RS resources.

FIG. 9 shows a block diagram 900 of a communications manager 920 that supports CRI for aggregated CSI-RS resources in accordance with one or more aspects of the present disclosure. The communications manager 920 may be an example of aspects of a communications manager 720, a communications manager 820, or both, as described herein. The communications manager 920, or various components thereof, may be an example of means for performing various aspects of CRI for aggregated CSI-RS resources as described herein. For example, the communications manager 920 may include a CSI-RS resource manager 925, a CSI-RS reception manager 930, a CRI manager 935, a CRI configuration manager 940, a CSI report manager 945, a CSI report configuration manager 950, a CRI quantity manager 955, or any combination thereof. Each of these components, or components or subcomponents thereof (e.g., one or more processors, one or more memories) , may communicate, directly or indirectly, with one another (e.g., via one or more buses) .

The communications manager 920 may support wireless communications in accordance with examples as disclosed herein. The CSI-RS resource manager 925 is capable of, configured to, or operable to support a means for receiving, from a network entity, control signaling indicating a set of CSI-RS resources, where the set of CSI-RS resources includes a set of multiple groups of CSI-RS resources, each group of the set of multiple groups is associated with a respective set of antenna port indices at the network entity, where the set of CSI-RS resources includes a set of multiple subsets of CSI-RS resources, and where each subset of CSI-RS resources includes one CSI-RS resource from each group. The CSI-RS reception manager 930 is capable of, configured to, or operable to support a means for receiving, from the network entity, a set of CSI-RSs via the set of CSI-RS resources. The CRI manager 935 is capable of, configured to, or operable to support a means for transmit, to the network entity based on the set of CSI-RSs, an uplink control message indicating one or more subsets of the set of multiple subsets of CSI-RS resources.

In some examples, the CRI configuration manager 940 is capable of, configured to, or operable to support a means for receiving second control signaling indicating a preconfigured quantity of subsets to report, where a quantity of the one or more subsets of the set of multiple subsets indicated by the uplink control message is equal to the preconfigured quantity of subsets.

In some examples, the CRI configuration manager 940 is capable of, configured to, or operable to support a means for receiving second control signaling indicating a threshold quantity of subsets to report, where a quantity of the one or more subsets indicated by the uplink control message is less than or equal to the threshold quantity of subsets.

In some examples, to support transmitting the uplink control message, the CSI report manager 945 is capable of, configured to, or operable to support a means for transmitting a respective channel state feedback report for each of the one or more subsets, where a quantity of the one or more subsets is greater than one.

In some examples, the CRI quantity manager 955 is capable of, configured to, or operable to support a means for transmitting, to the network entity and prior to transmission of the uplink control message, a second uplink control message indicating the quantity of the one or more subsets.

In some examples, the second uplink control message indicates respective quantities of subsets for each of a set of multiple channel state feedback reporting occasions. In some examples, the uplink control message is one of the set of multiple channel state feedback reporting occasions.

In some examples, to support transmitting the second uplink control message, the CRI quantity manager 955 is capable of, configured to, or operable to support a means for transmitting the second uplink control message via a MAC-CE.

In some examples, the CSI-RS resource manager 925 is capable of, configured to, or operable to support a means for receiving, via the control signaling, an indication of a same respective power offset value for each CSI-RS resource within a same subset of CSI-RS resources.

In some examples, the CSI-RS resource manager 925 is capable of, configured to, or operable to support a means for receiving, via the control signaling, an indication of a same respective RB for each CSI-RS resource within a same subset of CSI-RS resources. In some examples, each CSI-RS resource within a same subset of CSI-RS resources is scheduled within a threshold duration without a switch between downlink and uplink.

In some examples, the CSI report configuration manager 950 is capable of, configured to, or operable to support a means for receiving, via the control signaling, an indication of a first dimension size associated with a CSI report setting and an indication of a second dimension size associated with the CSI report setting, where the first dimension size is split equally into a quantity of multiples for CSI-RS port indexing of the set of multiple groups of CSI-RS resources.

In some examples, the first dimension size is one of a horizontal dimension size or a vertical dimension size. In some examples, each respective set of antenna port indices includes one or more antenna ports of a first polarization and one or more antenna ports of a second polarization. In some examples, a total quantity of antenna ports at the network entity used to transmit the set of CSI-RSs is greater than 32. In some examples, each subset of CSI-RS resources is associated with a respective TCI state and a respective QCL source reference signal.

FIG. 10 shows a diagram of a system 1000 including a device 1005 that supports CRI for aggregated CSI-RS resources in accordance with one or more aspects of the present disclosure. The device 1005 may be an example of or include the components of a device 705, a device 805, or a UE 115 as described herein. The device 1005 may communicate (e.g., wirelessly) with one or more network entities 105, one or more UEs 115, or any combination thereof. The device 1005 may include components for bi-directional voice and data communications including components for transmitting and receiving communications, such as a communications manager 1020, an input/output (I/O) controller 1010, a transceiver 1015, an antenna 1025, at least one memory 1030, code 1035, and at least one processor 1040. These components may be in electronic communication or otherwise coupled (e.g., operatively, communicatively, functionally, electronically, electrically) via one or more buses (e.g., a bus 1045) .

The I/O controller 1010 may manage input and output signals for the device 1005. The I/O controller 1010 may also manage peripherals not integrated into the device 1005. In some cases, the I/O controller 1010 may represent a physical connection or port to an external peripheral. In some cases, the I/O controller 1010 may utilize an operating system such as or another known operating system. Additionally, or alternatively, the I/O controller 1010 may represent or interact with a modem, a keyboard, a mouse, a touchscreen, or a similar device. In some cases, the I/O controller 1010 may be implemented as part of one or more processors, such as the at least one processor 1040. In some cases, a user may interact with the device 1005 via the I/O controller 1010 or via hardware components controlled by the I/O controller 1010.

In some cases, the device 1005 may include a single antenna 1025. However, in some other cases, the device 1005 may have more than one antenna 1025, which may be capable of concurrently transmitting or receiving multiple wireless transmissions. The transceiver 1015 may communicate bi-directionally, via the one or more antennas 1025, wired, or wireless links as described herein. For example, the transceiver 1015 may represent a wireless transceiver and may communicate bi-directionally with another wireless transceiver. The transceiver 1015 may also include a modem to modulate the packets, to provide the modulated packets to one or more antennas 1025 for transmission, and to demodulate packets received from the one or more antennas 1025. The transceiver 1015, or the transceiver 1015 and one or more antennas 1025, may be an example of a transmitter 715, a transmitter 815, a receiver 710, a receiver 810, or any combination thereof or component thereof, as described herein.

The at least one memory 1030 may include random access memory (RAM) and read-only memory (ROM) . The at least one memory 1030 may store computer-readable, computer-executable code 1035 including instructions that, when executed by the at least one processor 1040, cause the device 1005 to perform various functions described herein. The code 1035 may be stored in a non-transitory computer-readable medium such as system memory or another type of memory. In some cases, the code 1035 may not be directly executable by the at least one processor 1040 but may cause a computer (e.g., when compiled and executed) to perform functions described herein. In some cases, the at least one memory 1030 may contain, among other things, a basic I/O system (BIOS) which may control basic hardware or software operation such as the interaction with peripheral components or devices.

The at least one processor 1040 may include an intelligent hardware device (e.g., a general-purpose processor, a DSP, a CPU, a microcontroller, an ASIC, an FPGA, a programmable logic device, a discrete gate or transistor logic component, a discrete hardware component, or any combination thereof) . In some cases, the at least one processor 1040 may be configured to operate a memory array using a memory controller. In some other cases, a memory controller may be integrated into the at least one processor 1040. The at least one processor 1040 may be configured to execute computer-readable instructions stored in a memory (e.g., the at least one memory 1030) to cause the device 1005 to perform various functions (e.g., functions or tasks supporting CRI for aggregated CSI-RS resources) . For example, the device 1005 or a component of the device 1005 may include at least one processor 1040 and at least one memory 1030 coupled with or to the at least one processor 1040, the at least one processor 1040 and at least one memory 1030 configured to perform various functions described herein. In some examples, the at least one processor 1040 may include multiple processors and the at least one memory 1030 may include multiple memories. One or more of the multiple processors may be coupled with one or more of the multiple memories, which may, individually or collectively, be configured to perform various functions herein. In some examples, the at least one processor 1040 may be a component of a processing system, which may refer to a system (such as a series) of machines, circuitry (including, for example, one or both of processor circuitry (which may include the at least one processor 1040) and memory circuitry (which may include the at least one memory 1030) ) , or components, that receives or obtains inputs and processes the inputs to produce, generate, or obtain a set of outputs. The processing system may be configured to perform one or more of the functions described herein. As such, the at least one processor 1040 or a processing system including the at least one processor 1040 may be configured to, configurable to, or operable to cause the device 1005 to perform one or more of the functions described herein. Further, as described herein, being “configured to, ” being “configurable to, ” and being “operable to” may be used interchangeably and may be associated with a capability, when executing code stored in the at least one memory 1030 or otherwise, to perform one or more of the functions described herein.

The communications manager 1020 may support wireless communications in accordance with examples as disclosed herein. For example, the communications manager 1020 is capable of, configured to, or operable to support a means for receiving, from a network entity, control signaling indicating a set of CSI-RS resources, where the set of CSI-RS resources includes a set of multiple groups of CSI-RS resources, each group of the set of multiple groups is associated with a respective set of antenna port indices at the network entity, where the set of CSI-RS resources includes a set of multiple subsets of CSI-RS resources, and where each subset of CSI-RS resources includes one CSI-RS resource from each group. The communications manager 1020 is capable of, configured to, or operable to support a means for receiving, from the network entity, a set of CSI-RSs via the set of CSI-RS resources. The communications manager 1020 is capable of, configured to, or operable to support a means for transmitting, to the network entity based on the set of CSI-RSs, an uplink control message indicating one or more subsets of the set of multiple subsets of CSI-RS resources.

By including or configuring the communications manager 1020 in accordance with examples as described herein, the device 1005 may support techniques for improved communication reliability, more efficient utilization of communication resources, and improved coordination between devices.

In some examples, the communications manager 1020 may be configured to perform various operations (e.g., receiving, monitoring, transmitting) using or otherwise in cooperation with the transceiver 1015, the one or more antennas 1025, or any combination thereof. Although the communications manager 1020 is illustrated as a separate component, in some examples, one or more functions described with reference to the communications manager 1020 may be supported by or performed by the at least one processor 1040, the at least one memory 1030, the code 1035, or any combination thereof. For example, the code 1035 may include instructions executable by the at least one processor 1040 to cause the device 1005 to perform various aspects of CRI for aggregated CSI-RS resources as described herein, or the at least one processor 1040 and the at least one memory 1030 may be otherwise configured to, individually or collectively, perform or support such operations.

FIG. 11 shows a block diagram 1100 of a device 1105 that supports CRI for aggregated CSI-RS resources in accordance with one or more aspects of the present disclosure. The device 1105 may be an example of aspects of a network entity 105 as described herein. The device 1105 may include a receiver 1110, a transmitter 1115, and a communications manager 1120. The device 1105, or one or more components of the device 1105 (e.g., the receiver 1110, the transmitter 1115, and the communications manager 1120) , may include at least one processor, which may be coupled with at least one memory, to, individually or collectively, support or enable the described techniques. Each of these components may be in communication with one another (e.g., via one or more buses) .

The receiver 1110 may provide a means for obtaining (e.g., receiving, determining, identifying) information such as user data, control information, or any combination thereof (e.g., I/Q samples, symbols, packets, protocol data units, service data units) associated with various channels (e.g., control channels, data channels, information channels, channels associated with a protocol stack) . Information may be passed on to other components of the device 1105. In some examples, the receiver 1110 may support obtaining information by receiving signals via one or more antennas. Additionally, or alternatively, the receiver 1110 may support obtaining information by receiving signals via one or more wired (e.g., electrical, fiber optic) interfaces, wireless interfaces, or any combination thereof.

The transmitter 1115 may provide a means for outputting (e.g., transmitting, providing, conveying, sending) information generated by other components of the device 1105. For example, the transmitter 1115 may output information such as user data, control information, or any combination thereof (e.g., I/Q samples, symbols, packets, protocol data units, service data units) associated with various channels (e.g., control channels, data channels, information channels, channels associated with a protocol stack) . In some examples, the transmitter 1115 may support outputting information by transmitting signals via one or more antennas. Additionally, or alternatively, the transmitter 1115 may support outputting information by transmitting signals via one or more wired (e.g., electrical, fiber optic) interfaces, wireless interfaces, or any combination thereof. In some examples, the transmitter 1115 and the receiver 1110 may be co-located in a transceiver, which may include or be coupled with a modem.

The communications manager 1120, the receiver 1110, the transmitter 1115, or various combinations thereof or various components thereof may be examples of means for performing various aspects of CRI for aggregated CSI-RS resources as described herein. For example, the communications manager 1120, the receiver 1110, the transmitter 1115, or various combinations or components thereof may be capable of performing one or more of the functions described herein.

In some examples, the communications manager 1120, the receiver 1110, the transmitter 1115, or various combinations or components thereof may be implemented in hardware (e.g., in communications management circuitry) . The hardware may include at least one of a processor, a DSP, a CPU, an ASIC, an FPGA or other programmable logic device, a microcontroller, discrete gate or transistor logic, discrete hardware components, or any combination thereof configured as or otherwise supporting, individually or collectively, a means for performing the functions described in the present disclosure. In some examples, at least one processor and at least one memory coupled with the at least one processor may be configured to perform one or more of the functions described herein (e.g., by one or more processors, individually or collectively, executing instructions stored in the at least one memory) .

Additionally, or alternatively, the communications manager 1120, the receiver 1110, the transmitter 1115, or various combinations or components thereof may be implemented in code (e.g., as communications management software or firmware) executed by at least one processor. If implemented in code executed by at least one processor, the functions of the communications manager 1120, the receiver 1110, the transmitter 1115, or various combinations or components thereof may be performed by a general-purpose processor, a DSP, a CPU, an ASIC, an FPGA, a microcontroller, or any combination of these or other programmable logic devices (e.g., configured as or otherwise supporting, individually or collectively, a means for performing the functions described in the present disclosure) .

In some examples, the communications manager 1120 may be configured to perform various operations (e.g., receiving, obtaining, monitoring, outputting, transmitting) using or otherwise in cooperation with the receiver 1110, the transmitter 1115, or both. For example, the communications manager 1120 may receive information from the receiver 1110, send information to the transmitter 1115, or be integrated in combination with the receiver 1110, the transmitter 1115, or both to obtain information, output information, or perform various other operations as described herein.

The communications manager 1120 may support wireless communications in accordance with examples as disclosed herein. For example, the communications manager 1120 is capable of, configured to, or operable to support a means for transmitting, to a UE, control signaling indicating a set of CSI-RS resources, where the set of CSI-RS resources includes a set of multiple groups of CSI-RS resources, each group of the set of multiple groups is associated with a respective set of antenna port indices at the network entity, where the set of CSI-RS resources includes a set of multiple subsets of CSI-RS resources, and where each subset of CSI-RS resources includes one CSI-RS resource from each group. The communications manager 1120 is capable of, configured to, or operable to support a means for transmitting, to the UE, a set of CSI-RSs via the set of CSI-RS resources. The communications manager 1120 is capable of, configured to, or operable to support a means for receiving, from the UE based on the set of CSI-RSs, an uplink control message indicating one or more subsets of the set of multiple subsets of CSI-RS resources.

By including or configuring the communications manager 1120 in accordance with examples as described herein, the device 1105 (e.g., at least one processor controlling or otherwise coupled with the receiver 1110, the transmitter 1115, the communications manager 1120, or a combination thereof) may support techniques for more efficient utilization of communication resources.

FIG. 12 shows a block diagram 1200 of a device 1205 that supports CRI for aggregated CSI-RS resources in accordance with one or more aspects of the present disclosure. The device 1205 may be an example of aspects of a device 1105 or a network entity 105 as described herein. The device 1205 may include a receiver 1210, a transmitter 1215, and a communications manager 1220. The device 1205, or one or more components of the device 1205 (e.g., the receiver 1210, the transmitter 1215, and the communications manager 1220) , may include at least one processor, which may be coupled with at least one memory, to support the described techniques. Each of these components may be in communication with one another (e.g., via one or more buses) .

The receiver 1210 may provide a means for obtaining (e.g., receiving, determining, identifying) information such as user data, control information, or any combination thereof (e.g., I/Q samples, symbols, packets, protocol data units, service data units) associated with various channels (e.g., control channels, data channels, information channels, channels associated with a protocol stack) . Information may be passed on to other components of the device 1205. In some examples, the receiver 1210 may support obtaining information by receiving signals via one or more antennas. Additionally, or alternatively, the receiver 1210 may support obtaining information by receiving signals via one or more wired (e.g., electrical, fiber optic) interfaces, wireless interfaces, or any combination thereof.

The transmitter 1215 may provide a means for outputting (e.g., transmitting, providing, conveying, sending) information generated by other components of the device 1205. For example, the transmitter 1215 may output information such as user data, control information, or any combination thereof (e.g., I/Q samples, symbols, packets, protocol data units, service data units) associated with various channels (e.g., control channels, data channels, information channels, channels associated with a protocol stack) . In some examples, the transmitter 1215 may support outputting information by transmitting signals via one or more antennas. Additionally, or alternatively, the transmitter 1215 may support outputting information by transmitting signals via one or more wired (e.g., electrical, fiber optic) interfaces, wireless interfaces, or any combination thereof. In some examples, the transmitter 1215 and the receiver 1210 may be co-located in a transceiver, which may include or be coupled with a modem.

The device 1205, or various components thereof, may be an example of means for performing various aspects of CRI for aggregated CSI-RS resources as described herein. For example, the communications manager 1220 may include a CSI-RS resource manager 1225, a CSI-RS transmission manager 1230, a CRI manager 1235, or any combination thereof. The communications manager 1220 may be an example of aspects of a communications manager 1120 as described herein. In some examples, the communications manager 1220, or various components thereof, may be configured to perform various operations (e.g., receiving, obtaining, monitoring, outputting, transmitting) using or otherwise in cooperation with the receiver 1210, the transmitter 1215, or both. For example, the communications manager 1220 may receive information from the receiver 1210, send information to the transmitter 1215, or be integrated in combination with the receiver 1210, the transmitter 1215, or both to obtain information, output information, or perform various other operations as described herein.

The communications manager 1220 may support wireless communications in accordance with examples as disclosed herein. The CSI-RS resource manager 1225 is capable of, configured to, or operable to support a means for transmitting, to a UE, control signaling indicating a set of CSI-RS resources, where the set of CSI-RS resources includes a set of multiple groups of CSI-RS resources, each group of the set of multiple groups is associated with a respective set of antenna port indices at the network entity, where the set of CSI-RS resources includes a set of multiple subsets of CSI-RS resources, and where each subset of CSI-RS resources includes one CSI-RS resource from each group. The CSI-RS transmission manager 1230 is capable of, configured to, or operable to support a means for transmitting, to the UE, a set of CSI-RSs via the set of CSI-RS resources. The CRI manager 1235 is capable of, configured to, or operable to support a means for receiving, from the UE based on the set of CSI-RSs, an uplink control message indicating one or more subsets of the set of multiple subsets of CSI-RS resources.

FIG. 13 shows a block diagram 1300 of a communications manager 1320 that supports CRI for aggregated CSI-RS resources in accordance with one or more aspects of the present disclosure. The communications manager 1320 may be an example of aspects of a communications manager 1120, a communications manager 1220, or both, as described herein. The communications manager 1320, or various components thereof, may be an example of means for performing various aspects of CRI for aggregated CSI-RS resources as described herein. For example, the communications manager 1320 may include a CSI-RS resource manager 1325, a CSI-RS transmission manager 1330, a CRI manager 1335, a CRI configuration manager 1340, a CSI report manager 1345, a CSI report configuration manager 1350, a CRI quantity manager 1355, or any combination thereof. Each of these components, or components or subcomponents thereof (e.g., one or more processors, one or more memories) , may communicate, directly or indirectly, with one another (e.g., via one or more buses) which may include communications within a protocol layer of a protocol stack, communications associated with a logical channel of a protocol stack (e.g., between protocol layers of a protocol stack, within a device, component, or virtualized component associated with a network entity 105, between devices, components, or virtualized components associated with a network entity 105) , or any combination thereof.

The communications manager 1320 may support wireless communications in accordance with examples as disclosed herein. The CSI-RS resource manager 1325 is capable of, configured to, or operable to support a means for transmitting, to a UE, control signaling indicating a set of CSI-RS resources, where the set of CSI-RS resources includes a set of multiple groups of CSI-RS resources, each group of the set of multiple groups is associated with a respective set of antenna port indices at the network entity, where the set of CSI-RS resources includes a set of multiple subsets of CSI-RS resources, and where each subset of CSI-RS resources includes one CSI-RS resource from each group. The CSI-RS transmission manager 1330 is capable of, configured to, or operable to support a means for transmitting, to the UE, a set of CSI-RSs via the set of CSI-RS resources. The CRI manager 1335 is capable of, configured to, or operable to support a means for receiving, from the UE based on the set of CSI-RSs, an uplink control message indicating one or more subsets of the set of multiple subsets of CSI-RS resources.

In some examples, the CRI configuration manager 1340 is capable of, configured to, or operable to support a means for transmitting second control signaling indicating a preconfigured quantity of subsets to report, where a quantity of the one or more subsets of the set of multiple subsets indicated by the uplink control message is equal to the preconfigured quantity of subsets.

In some examples, the CRI configuration manager 1340 is capable of, configured to, or operable to support a means for transmitting second control signaling indicating a threshold quantity of subsets to report, where a quantity of the one or more subsets of the set of multiple subsets indicated by the uplink control message is less than or equal to the threshold quantity of subsets.

In some examples, to support receiving the uplink control message, the CSI report manager 1345 is capable of, configured to, or operable to support a means for receiving a respective channel state feedback report for each of the one or more subsets, where a quantity of the one or more subsets is greater than one.

In some examples, the CRI quantity manager 1355 is capable of, configured to, or operable to support a means for receiving, from the UE and prior to reception of the uplink control message, a second uplink control message indicating the quantity of the one or more subsets. In some examples, the second uplink control message indicates respective quantities of subsets for each of a set of multiple channel state feedback reporting occasions. In some examples, the uplink control message is one of the set of multiple channel state feedback reporting occasions.

In some examples, to support receiving the second uplink control message, the CRI quantity manager 1355 is capable of, configured to, or operable to support a means for receiving the second uplink control message via a MAC-CE.

In some examples, the CSI-RS resource manager 1325 is capable of, configured to, or operable to support a means for transmitting, via the control signaling, an indication of a same respective power offset value for each CSI-RS resource within a same subset of CSI-RS resources.

In some examples, the CSI-RS resource manager 1325 is capable of, configured to, or operable to support a means for transmitting, via the control signaling, an indication of a same respective RB for each CSI-RS resource within a same subset of CSI-RS resources. In some examples, each CSI-RS resource within a same subset of CSI-RS resources is scheduled within a threshold duration without a switch between uplink and downlink.

In some examples, the CSI report configuration manager 1350 is capable of, configured to, or operable to support a means for transmitting, via the control signaling, an indication of a first dimension size associated with a CSI report setting and an indication of a second dimension size associated with the CSI report setting, where the first dimension size is split equally into a quantity of multiples for CSI-RS port indexing of the set of multiple groups of CSI-RS resources.

FIG. 14 shows a diagram of a system 1400 including a device 1405 that supports CRI for aggregated CSI-RS resources in accordance with one or more aspects of the present disclosure. The device 1405 may be an example of or include the components of a device 1105, a device 1205, or a network entity 105 as described herein. The device 1405 may communicate with one or more network entities 105, one or more UEs 115, or any combination thereof, which may include communications over one or more wired interfaces, over one or more wireless interfaces, or any combination thereof. The device 1405 may include components that support outputting and obtaining communications, such as a communications manager 1420, a transceiver 1410, an antenna 1415, at least one memory 1425, code 1430, and at least one processor 1435. These components may be in electronic communication or otherwise coupled (e.g., operatively, communicatively, functionally, electronically, electrically) via one or more buses (e.g., a bus 1440) .

The transceiver 1410 may support bi-directional communications via wired links, wireless links, or both as described herein. In some examples, the transceiver 1410 may include a wired transceiver and may communicate bi-directionally with another wired transceiver. Additionally, or alternatively, in some examples, the transceiver 1410 may include a wireless transceiver and may communicate bi-directionally with another wireless transceiver. In some examples, the device 1405 may include one or more antennas 1415, which may be capable of transmitting or receiving wireless transmissions (e.g., concurrently) . The transceiver 1410 may also include a modem to modulate signals, to provide the modulated signals for transmission (e.g., by one or more antennas 1415, by a wired transmitter) , to receive modulated signals (e.g., from one or more antennas 1415, from a wired receiver) , and to demodulate signals. In some implementations, the transceiver 1410 may include one or more interfaces, such as one or more interfaces coupled with the one or more antennas 1415 that are configured to support various receiving or obtaining operations, or one or more interfaces coupled with the one or more antennas 1415 that are configured to support various transmitting or outputting operations, or a combination thereof. In some implementations, the transceiver 1410 may include or be configured for coupling with one or more processors or one or more memory components that are operable to perform or support operations based on received or obtained information or signals, or to generate information or other signals for transmission or other outputting, or any combination thereof. In some implementations, the transceiver 1410, or the transceiver 1410 and the one or more antennas 1415, or the transceiver 1410 and the one or more antennas 1415 and one or more processors or one or more memory components (e.g., the at least one processor 1435, the at least one memory 1425, or both) , may be included in a chip or chip assembly that is installed in the device 1405. In some examples, the transceiver 1410 may be operable to support communications via one or more communications links (e.g., a communication link 125, a backhaul communication link 120, a midhaul communication link 162, a fronthaul communication link 168) .

The at least one memory 1425 may include RAM, ROM, or any combination thereof. The at least one memory 1425 may store computer-readable, computer-executable code 1430 including instructions that, when executed by one or more of the at least one processor 1435, cause the device 1405 to perform various functions described herein. The code 1430 may be stored in a non-transitory computer-readable medium such as system memory or another type of memory. In some cases, the code 1430 may not be directly executable by a processor of the at least one processor 1435 but may cause a computer (e.g., when compiled and executed) to perform functions described herein. In some cases, the at least one memory 1425 may contain, among other things, a BIOS which may control basic hardware or software operation such as the interaction with peripheral components or devices. In some examples, the at least one processor 1435 may include multiple processors and the at least one memory 1425 may include multiple memories. One or more of the multiple processors may be coupled with one or more of the multiple memories which may, individually or collectively, be configured to perform various functions herein (for example, as part of a processing system) .

The at least one processor 1435 may include an intelligent hardware device (e.g., a general-purpose processor, a DSP, an ASIC, a CPU, an FPGA, a microcontroller, a programmable logic device, discrete gate or transistor logic, a discrete hardware component, or any combination thereof) . In some cases, the at least one processor 1435 may be configured to operate a memory array using a memory controller. In some other cases, a memory controller may be integrated into one or more of the at least one processor 1435. The at least one processor 1435 may be configured to execute computer-readable instructions stored in a memory (e.g., one or more of the at least one memory 1425) to cause the device 1405 to perform various functions (e.g., functions or tasks supporting CRI for aggregated CSI-RS resources) . For example, the device 1405 or a component of the device 1405 may include at least one processor 1435 and at least one memory 1425 coupled with one or more of the at least one processor 1435, the at least one processor 1435 and the at least one memory 1425 configured to perform various functions described herein. The at least one processor 1435 may be an example of a cloud-computing platform (e.g., one or more physical nodes and supporting software such as operating systems, virtual machines, or container instances) that may host the functions (e.g., by executing code 1430) to perform the functions of the device 1405. The at least one processor 1435 may be any one or more suitable processors capable of executing scripts or instructions of one or more software programs stored in the device 1405 (such as within one or more of the at least one memory 1425) . In some examples, the at least one processor 1435 may include multiple processors and the at least one memory 1425 may include multiple memories. One or more of the multiple processors may be coupled with one or more of the multiple memories, which may, individually or collectively, be configured to perform various functions herein. In some examples, the at least one processor 1435 may be a component of a processing system, which may refer to a system (such as a series) of machines, circuitry (including, for example, one or both of processor circuitry (which may include the at least one processor 1435) and memory circuitry (which may include the at least one memory 1425) ) , or components, that receives or obtains inputs and processes the inputs to produce, generate, or obtain a set of outputs. The processing system may be configured to perform one or more of the functions described herein. As such, the at least one processor 1435 or a processing system including the at least one processor 1435 may be configured to, configurable to, or operable to cause the device 1405 to perform one or more of the functions described herein. Further, as described herein, being “configured to, ” being “configurable to, ” and being “operable to” may be used interchangeably and may be associated with a capability, when executing code stored in the at least one memory 1425 or otherwise, to perform one or more of the functions described herein.

In some examples, a bus 1440 may support communications of (e.g., within) a protocol layer of a protocol stack. In some examples, a bus 1440 may support communications associated with a logical channel of a protocol stack (e.g., between protocol layers of a protocol stack) , which may include communications performed within a component of the device 1405, or between different components of the device 1405 that may be co-located or located in different locations (e.g., where the device 1405 may refer to a system in which one or more of the communications manager 1420, the transceiver 1410, the at least one memory 1425, the code 1430, and the at least one processor 1435 may be located in one of the different components or divided between different components) .

In some examples, the communications manager 1420 may manage aspects of communications with a core network 130 (e.g., via one or more wired or wireless backhaul links) . For example, the communications manager 1420 may manage the transfer of data communications for client devices, such as one or more UEs 115. In some examples, the communications manager 1420 may manage communications with other network entities 105, and may include a controller or scheduler for controlling communications with UEs 115 in cooperation with other network entities 105. In some examples, the communications manager 1420 may support an X2 interface within an LTE/LTE-A wireless communications network technology to provide communication between network entities 105.

The communications manager 1420 may support wireless communications in accordance with examples as disclosed herein. For example, the communications manager 1420 is capable of, configured to, or operable to support a means for transmitting, to a UE, control signaling indicating a set of CSI-RS resources, where the set of CSI-RS resources includes a set of multiple groups of CSI-RS resources, each group of the set of multiple groups is associated with a respective set of antenna port indices at the network entity, where the set of CSI-RS resources includes a set of multiple subsets of CSI-RS resources, and where each subset of CSI-RS resources includes one CSI-RS resource from each group. The communications manager 1420 is capable of, configured to, or operable to support a means for transmitting, to the UE, a set of CSI-RSs via the set of CSI-RS resources. The communications manager 1420 is capable of, configured to, or operable to support a means for receiving, from the UE based on the set of CSI-RSs, an uplink control message indicating one or more subsets of the set of multiple subsets of CSI-RS resources.

By including or configuring the communications manager 1420 in accordance with examples as described herein, the device 1405 may support techniques for improved communication reliability, more efficient utilization of communication resources, and improved coordination between devices.

In some examples, the communications manager 1420 may be configured to perform various operations (e.g., receiving, obtaining, monitoring, outputting, transmitting) using or otherwise in cooperation with the transceiver 1410, the one or more antennas 1415 (e.g., where applicable) , or any combination thereof. Although the communications manager 1420 is illustrated as a separate component, in some examples, one or more functions described with reference to the communications manager 1420 may be supported by or performed by the transceiver 1410, one or more of the at least one processor 1435, one or more of the at least one memory 1425, the code 1430, or any combination thereof (for example, by a processing system including at least a portion of the at least one processor 1435, the at least one memory 1425, the code 1430, or any combination thereof) . For example, the code 1430 may include instructions executable by one or more of the at least one processor 1435 to cause the device 1405 to perform various aspects of CRI for aggregated CSI-RS resources as described herein, or the at least one processor 1435 and the at least one memory 1425 may be otherwise configured to, individually or collectively, perform or support such operations.

FIG. 15 shows a flowchart illustrating a method 1500 that supports CRI for aggregated CSI-RS resources in accordance with aspects of the present disclosure. The operations of the method 1500 may be implemented by a UE or its components as described herein. For example, the operations of the method 1500 may be performed by a UE 115 as described with reference to FIGs. 1 through 10. In some examples, a UE may execute a set of instructions to control the functional elements of the UE to perform the described functions. Additionally, or alternatively, the UE may perform aspects of the described functions using special-purpose hardware.

At 1505, the method may include receiving, from a network entity, control signaling indicating a set of CSI-RS resources, where the set of CSI-RS resources includes a set of multiple groups of CSI-RS resources, each group of the set of multiple groups is associated with a respective set of antenna port indices at the network entity, where the set of CSI-RS resources includes a set of multiple subsets of CSI-RS resources, and where each subset of CSI-RS resources includes one CSI-RS resource from each group. The operations of 1505 may be performed in accordance with examples as disclosed herein. In some examples, aspects of the operations of 1505 may be performed by a CSI-RS resource manager 925 as described with reference to FIG. 9.

At 1510, the method may include receiving, from the network entity, a set of CSI-RSs via the set of CSI-RS resources. The operations of 1510 may be performed in accordance with examples as disclosed herein. In some examples, aspects of the operations of 1510 may be performed by a CSI-RS reception manager 930 as described with reference to FIG. 9.

At 1515, the method may include transmit, to the network entity based on the set of CSI-RSs, an uplink control message indicating one or more subsets of the set of multiple subsets of CSI-RS resources. The operations of 1515 may be performed in accordance with examples as disclosed herein. In some examples, aspects of the operations of 1515 may be performed by a CRI manager 935 as described with reference to FIG. 9.

FIG. 16 shows a flowchart illustrating a method 1600 that supports CRI for aggregated CSI-RS resources in accordance with aspects of the present disclosure. The operations of the method 1600 may be implemented by a network entity or its components as described herein. For example, the operations of the method 1600 may be performed by a network entity as described with reference to FIGs. 1 through 6 and 11 through 14. In some examples, a network entity may execute a set of instructions to control the functional elements of the network entity to perform the described functions. Additionally, or alternatively, the network entity may perform aspects of the described functions using special-purpose hardware.

At 1605, the method may include transmitting, to a UE, control signaling indicating a set of CSI-RS resources, where the set of CSI-RS resources includes a set of multiple groups of CSI-RS resources, each group of the set of multiple groups is associated with a respective set of antenna port indices at the network entity, where the set of CSI-RS resources includes a set of multiple subsets of CSI-RS resources, and where each subset of CSI-RS resources includes one CSI-RS resource from each group. The operations of 1605 may be performed in accordance with examples as disclosed herein. In some examples, aspects of the operations of 1605 may be performed by a CSI-RS resource manager 1325 as described with reference to FIG. 13.

At 1610, the method may include transmitting, to the UE, a set of CSI-RSs via the set of CSI-RS resources. The operations of 1610 may be performed in accordance with examples as disclosed herein. In some examples, aspects of the operations of 1610 may be performed by a CSI-RS transmission manager 1330 as described with reference to FIG. 13.

At 1615, the method may include receiving, from the UE based on the set of CSI-RSs, an uplink control message indicating one or more subsets of the set of multiple subsets of CSI-RS resources. The operations of 1615 may be performed in accordance with examples as disclosed herein. In some examples, aspects of the operations of 1615 may be performed by a CRI manager 1335 as described with reference to FIG. 13.

The following provides an overview of aspects of the present disclosure:

Aspect 1: A method for wireless communications at a UE, comprising: receiving, from a network entity, control signaling indicating a set of CSI-RS resources, wherein the set of CSI-RS resources comprises a plurality of groups of CSI-RS resources, each group of the plurality of groups is associated with a respective set of antenna port indices at the network entity, wherein the set of CSI-RS resources comprises a plurality of subsets of CSI-RS resources, and wherein each subset of CSI-RS resources includes one CSI-RS resource from each group; receiving, from the network entity, a set of CSI-RSs via the set of CSI-RS resources; and transmit, to the network entity based at least in part on the set of CSI-RSs, an uplink control message indicating one or more subsets of the plurality of subsets of CSI-RS resources.

Aspect 2: The method of aspect 1, further comprising: receiving second control signaling indicating a preconfigured quantity of subsets to report, wherein a quantity of the one or more subsets of the plurality of subsets indicated by the uplink control message is equal to the preconfigured quantity of subsets.

Aspect 3: The method of aspect 1, further comprising: receiving second control signaling indicating a threshold quantity of subsets to report, wherein a quantity of the one or more subsets indicated by the uplink control message is less than or equal to the threshold quantity of subsets.

Aspect 4: The method of any of aspects 1 through 3, wherein transmitting the uplink control message comprises: transmitting a respective channel state feedback report for each of the one or more subsets, wherein a quantity of the one or more subsets is greater than one.

Aspect 5: The method of aspect 4, further comprising: transmitting, to the network entity and prior to transmission of the uplink control message, a second uplink control message indicating the quantity of the one or more subsets.

Aspect 6: The method of aspect 5, wherein the second uplink control message indicates respective quantities of subsets for each of a plurality of channel state feedback reporting occasions, and the uplink control message is one of the plurality of channel state feedback reporting occasions.

Aspect 7: The method of aspect 6, wherein transmitting the second uplink control message comprises: transmitting the second uplink control message via a MAC-CE.

Aspect 8: The method of any of aspects 1 through 7, further comprising: receiving, via the control signaling, an indication of a same respective power offset value for each CSI-RS resource within a same subset of CSI-RS resources.

Aspect 9: The method of any of aspects 1 through 8, further comprising: receiving, via the control signaling, an indication of a same respective RB for each CSI-RS resource within a same subset of CSI-RS resources.

Aspect 10: The method of any of aspects 1 through 9, wherein each CSI-RS resource within a same subset of CSI-RS resources is scheduled within a threshold duration without a switch between downlink and uplink.

Aspect 11: The method of any of aspects 1 through 10, further comprising: receiving, via the control signaling, an indication of a first dimension size associated with a channel state information report setting and an indication of a second dimension size associated with the channel state information report setting, wherein the first dimension size is split equally into a quantity of multiples for CSI-RS port indexing of the plurality of groups of CSI-RS resources.

Aspect 12: The method of aspect 11, wherein the first dimension size is one of a horizontal dimension size or a vertical dimension size.

Aspect 13: The method of any of aspects 1 through 12, wherein each respective set of antenna port indices includes one or more antenna ports of a first polarization and one or more antenna ports of a second polarization.

Aspect 14: The method of any of aspects 1 through 13, wherein a total quantity of antenna ports at the network entity used to transmit the set of CSI-RSs is greater than 32.

Aspect 15: The method of any of aspects 1 through 14, wherein each subset of CSI-RS resources is associated with a respective TCI state and a respective QCL source reference signal.

Aspect 16: A method for wireless communications at a network entity, comprising: transmitting, to a UE, control signaling indicating a set of CSI-RS resources, wherein the set of CSI-RS resources comprises a plurality of groups of CSI-RS resources, each group of the plurality of groups is associated with a respective set of antenna port indices at the network entity, wherein the set of CSI-RS resources comprises a plurality of subsets of CSI-RS resources, and wherein each subset of CSI-RS resources includes one CSI-RS resource from each group; transmitting, to the UE, a set of CSI-RSs via the set of CSI-RS resources; and receiving, from the UE based at least in part on the set of CSI-RSs, an uplink control message indicating one or more subsets of the plurality of subsets of CSI-RS resources.

Aspect 17: The method of aspect 16, further comprising: transmitting second control signaling indicating a preconfigured quantity of subsets to report, wherein a quantity of the one or more subsets of the plurality of subsets indicated by the uplink control message is equal to the preconfigured quantity of subsets.

Aspect 18: The method of aspect 16, further comprising: transmitting second control signaling indicating a threshold quantity of subsets to report, wherein a quantity of the one or more subsets of the plurality of subsets indicated by the uplink control message is less than or equal to the threshold quantity of subsets.

Aspect 19: The method of any of aspects 16 through 18, wherein receiving the uplink control message comprises: receiving a respective channel state feedback report for each of the one or more subsets, wherein a quantity of the one or more subsets is greater than one.

Aspect 20: The method of aspect 19, further comprising: receiving, from the UE and prior to reception of the uplink control message, a second uplink control message indicating the quantity of the one or more subsets.

Aspect 21: The method of aspect 20, wherein the second uplink control message indicates respective quantities of subsets for each of a plurality of channel state feedback reporting occasions, and the uplink control message is one of the plurality of channel state feedback reporting occasions.

Aspect 22: The method of aspect 21, wherein receiving the second uplink control message comprises: receiving the second uplink control message via a MAC-CE.

Aspect 23: The method of any of aspects 16 through 22, further comprising: transmitting, via the control signaling, an indication of a same respective power offset value for each CSI-RS resource within a same subset of CSI-RS resources.

Aspect 24: The method of any of aspects 16 through 23, further comprising: transmitting, via the control signaling, an indication of a same respective RB for each CSI-RS resource within a same subset of CSI-RS resources.

Aspect 25: The method of any of aspects 16 through 24, wherein each CSI-RS resource within a same subset of CSI-RS resources is scheduled within a threshold duration without a switch between uplink and downlink.

Aspect 26: The method of any of aspects 16 through 25, further comprising: transmitting, via the control signaling, an indication of a first dimension size associated with a channel state information report setting and an indication of a second dimension size associated with the channel state information report setting, wherein the first dimension size is split equally into a quantity of multiples for CSI-RS port indexing of the plurality of groups of CSI-RS resources.

Aspect 27: The method of aspect 26, wherein the first dimension size is one of a horizontal dimension size or a vertical dimension size.

Aspect 28: The method of any of aspects 16 through 27, wherein each respective set of antenna port indices includes one or more antenna ports of a first polarization and one or more antenna ports of a second polarization.

Aspect 29: The method of any of aspects 16 through 28, wherein a total quantity of antenna ports at the network entity used to transmit the set of CSI-RSs is greater than 32.

Aspect 30: The method of any of aspects 16 through 29, wherein each subset of CSI-RS resources is associated with a respective TCI state and a respective QCL source reference signal.

Aspect 31: A UE for wireless communications, comprising one or more memories storing processor-executable code, and one or more processors coupled with the one or more memories and individually or collectively operable to execute the code to cause the UE to perform a method of any of aspects 1 through 15.

Aspect 32: A UE for wireless communications, comprising at least one means for performing a method of any of aspects 1 through 15.

Aspect 33: A non-transitory computer-readable medium storing code for wireless communications, the code comprising instructions executable by one or more processors to perform a method of any of aspects 1 through 15.

Aspect 34: A network entity for wireless communications, comprising one or more memories storing processor-executable code, and one or more processors coupled with the one or more memories and individually or collectively operable to execute the code to cause the network entity to perform a method of any of aspects 16 through 30.

Aspect 35: A network entity for wireless communications, comprising at least one means for performing a method of any of aspects 16 through 30.

Aspect 36: A non-transitory computer-readable medium storing code for wireless communications, the code comprising instructions executable by one or more processors to perform a method of any of aspects 16 through 30.

It should be noted that the methods described herein describe possible implementations, and that the operations and the steps may be rearranged or otherwise modified and that other implementations are possible. Further, aspects from two or more of the methods may be combined.

Although aspects of an LTE, LTE-A, LTE-A Pro, or NR system may be described for purposes of example, and LTE, LTE-A, LTE-A Pro, or NR terminology may be used in much of the description, the techniques described herein are applicable beyond LTE, LTE-A, LTE-A Pro, or NR networks. For example, the described techniques may be applicable to various other wireless communications systems such as Ultra Mobile Broadband (UMB) , Institute of Electrical and Electronics Engineers (IEEE) 802.11 (Wi-Fi) , IEEE 802.16 (WiMAX) , IEEE 802.20, Flash-OFDM, as well as other systems and radio technologies not explicitly mentioned herein.

Information and signals described herein may be represented using any of a variety of different technologies and techniques. For example, data, instructions, commands, information, signals, bits, symbols, and chips that may be referenced throughout the description may be represented by voltages, currents, electromagnetic waves, magnetic fields or particles, optical fields or particles, or any combination thereof.

The various illustrative blocks and components described in connection with the disclosure herein may be implemented or performed using a general-purpose processor, a DSP, an ASIC, a CPU, an FPGA or other programmable logic device, discrete gate or transistor logic, discrete hardware components, or any combination thereof designed to perform the functions described herein. A general-purpose processor may be a microprocessor but, in the alternative, the processor may be any processor, controller, microcontroller, or state machine. A processor may also be implemented as a combination of computing devices (e.g., a combination of a DSP and a microprocessor, multiple microprocessors, one or more microprocessors in conjunction with a DSP core, or any other such configuration) . Any functions or operations described herein as being capable of being performed by a processor may be performed by multiple processors that, individually or collectively, are capable of performing the described functions or operations.

The functions described herein may be implemented using hardware, software executed by a processor, firmware, or any combination thereof. If implemented using software executed by a processor, the functions may be stored as or transmitted using one or more instructions or code of a computer-readable medium. Other examples and implementations are within the scope of the disclosure and appended claims. For example, due to the nature of software, functions described herein may be implemented using software executed by a processor, hardware, firmware, hardwiring, or combinations of any of these. Features implementing functions may also be physically located at various positions, including being distributed such that portions of functions are implemented at different physical locations.

Computer-readable media includes both non-transitory computer storage media and communication media including any medium that facilitates transfer of a computer program from one location to another. A non-transitory storage medium may be any available medium that may be accessed by a general-purpose or special-purpose computer. By way of example, and not limitation, non-transitory computer-readable media may include RAM, ROM, electrically erasable programmable ROM (EEPROM) , flash memory, compact disk (CD) ROM or other optical disk storage, magnetic disk storage or other magnetic storage devices, or any other non-transitory medium that may be used to carry or store desired program code means in the form of instructions or data structures and that may be accessed by a general-purpose or special-purpose computer, or a general-purpose or special-purpose processor. Also, any connection is properly termed a computer-readable medium. For example, if the software is transmitted from a website, server, or other remote source using a coaxial cable, fiber optic cable, twisted pair, digital subscriber line (DSL) , or wireless technologies such as infrared, radio, and microwave, then the coaxial cable, fiber optic cable, twisted pair, DSL, or wireless technologies such as infrared, radio, and microwave are included in the definition of computer-readable medium. Disk and disc, as used herein, include CD, laser disc, optical disc, digital versatile disc (DVD) , floppy disk and Blu-ray disc. Disks may reproduce data magnetically, and discs may reproduce data optically using lasers. Combinations of the above are also included within the scope of computer-readable media. Any functions or operations described herein as being capable of being performed by a memory may be performed by multiple memories that, individually or collectively, are capable of performing the described functions or operations.

As used herein, including in the claims, “or” as used in a list of items (e.g., a list of items prefaced by a phrase such as “at least one of” or “one or more of” ) indicates an inclusive list such that, for example, a list of at least one of A, B, or C means A or B or C or AB or AC or BC or ABC (i.e., A and B and C) . Also, as used herein, the phrase “based on” shall not be construed as a reference to a closed set of conditions. For example, an example step that is described as “based on condition A” may be based on both a condition A and a condition B without departing from the scope of the present disclosure. In other words, as used herein, the phrase “based on” shall be construed in the same manner as the phrase “based at least in part on. ”

As used herein, including in the claims, the article “a” before a noun is open-ended and understood to refer to “at least one” of those nouns or “one or more” of those nouns. Thus, the terms “a, ” “at least one, ” “one or more, ” “at least one of one or more” may be interchangeable. For example, if a claim recites “a component” that performs one or more functions, each of the individual functions may be performed by a single component or by any combination of multiple components. Thus, the term “a component” having characteristics or performing functions may refer to “at least one of one or more components” having a particular characteristic or performing a particular function. Subsequent reference to a component introduced with the article “a” using the terms “the” or “said” may refer to any or all of the one or more components. For example, a component introduced with the article “a” may be understood to mean “one or more components, ” and referring to “the component” subsequently in the claims may be understood to be equivalent to referring to “at least one of the one or more components. ” Similarly, subsequent reference to a component introduced as “one or more components” using the terms “the” or “said” may refer to any or all of the one or more components. For example, referring to “the one or more components” subsequently in the claims may be understood to be equivalent to referring to “at least one of the one or more components. ”

The term “determine” or “determining” encompasses a variety of actions and, therefore, “determining” can include calculating, computing, processing, deriving, investigating, looking up (such as via looking up in a table, a database or another data structure) , ascertaining and the like. Also, “determining” can include receiving (e.g., receiving information) , accessing (e.g., accessing data stored in memory) and the like. Also, “determining” can include resolving, obtaining, selecting, choosing, establishing, and other such similar actions.

In the appended figures, similar components or features may have the same reference label. Further, various components of the same type may be distinguished by following the reference label by a dash and a second label that distinguishes among the similar components. If just the first reference label is used in the specification, the description is applicable to any one of the similar components having the same first reference label irrespective of the second reference label, or other subsequent reference label.

The description set forth herein, in connection with the appended drawings, describes example configurations and does not represent all the examples that may be implemented or that are within the scope of the claims. The term “example” used herein means “serving as an example, instance, or illustration, ” and not “preferred” or “advantageous over other examples. ” The detailed description includes specific details for the purpose of providing an understanding of the described techniques. These techniques, however, may be practiced without these specific details. In some instances, known structures and devices are shown in block diagram form in order to avoid obscuring the concepts of the described examples.

The description herein is provided to enable a person having ordinary skill in the art to make or use the disclosure. Various modifications to the disclosure will be apparent to a person having ordinary skill in the art, and the generic principles defined herein may be applied to other variations without departing from the scope of the disclosure. Thus, the disclosure is not limited to the examples and designs described herein but is to be accorded the broadest scope consistent with the principles and novel features disclosed herein.

Claims

A user equipment (UE) , comprising:

one or more memories storing processor-executable code; and

one or more processors coupled with the one or more memories and individually or collectively operable to execute the code to cause the UE to:

receive, from a network entity, control signaling indicating a set of channel state information reference signal resources, wherein the set of channel state information reference signal resources comprises a plurality of groups of channel state information reference signal resources, each group of the plurality of groups is associated with a respective set of antenna port indices at the network entity, wherein the set of channel state information reference signal resources comprises a plurality of subsets of channel state information reference signal resources, and wherein each subset of channel state information reference signal resources includes one channel state information reference signal resource from each group;

receive, from the network entity, a set of channel state information reference signals via the set of channel state information reference signal resources; and

transmit, to the network entity based at least in part on the set of channel state information reference signals, an uplink control message indicating one or more subsets of the plurality of subsets of channel state information reference signal resources.
The UE of claim 1, wherein the one or more processors are individually or collectively further operable to execute the code to cause the UE to:

receive second control signaling indicating a preconfigured quantity of subsets to report, wherein a quantity of the one or more subsets of the plurality of subsets indicated by the uplink control message is equal to the preconfigured quantity of subsets.
The UE of claim 1, wherein the one or more processors are individually or collectively further operable to execute the code to cause the UE to:

receive second control signaling indicating a threshold quantity of subsets to report, wherein a quantity of the one or more subsets indicated by the uplink control message is less than or equal to the threshold quantity of subsets.
The UE of claim 1, wherein, to transmit the uplink control message, the one or more processors are individually or collectively operable to execute the code to cause the UE to:

transmit a respective channel state feedback report for each of the one or more subsets, wherein a quantity of the one or more subsets is greater than one.
The UE of claim 4, wherein the one or more processors are individually or collectively further operable to execute the code to cause the UE to:

transmit, to the network entity and prior to transmission of the uplink control message, a second uplink control message indicating the quantity of the one or more subsets.
The UE of claim 5, wherein:

the second uplink control message indicates respective quantities of subsets for each of a plurality of channel state feedback reporting occasions, and

the uplink control message is one of the plurality of channel state feedback reporting occasions.
The UE of claim 6, wherein, to transmit the second uplink control message, the one or more processors are individually or collectively operable to execute the code to cause the UE to:

transmit the second uplink control message via a medium access control (MAC) control element.
The UE of claim 1, wherein the one or more processors are individually or collectively further operable to execute the code to cause the UE to:

receive, via the control signaling, an indication of a same respective power offset value for each channel state information reference signal resource within a same subset of channel state information reference signal resources.
The UE of claim 1, wherein the one or more processors are individually or collectively further operable to execute the code to cause the UE to:

receive, via the control signaling, an indication of a same respective resource block for each channel state information reference signal resource within a same subset of channel state information reference signal resources.
The UE of claim 1, wherein each channel state information reference signal resource within a same subset of channel state information reference signal resources is scheduled within a threshold duration without a switch between downlink and uplink.
The UE of claim 1, wherein the one or more processors are individually or collectively further operable to execute the code to cause the UE to:

receive, via the control signaling, an indication of a first dimension size associated with a channel state information report setting and an indication of a second dimension size associated with the channel state information report setting, wherein the first dimension size is split equally into a quantity of multiples for channel state information reference signal port indexing of the plurality of groups of channel state information reference signal resources.
The UE of claim 11, wherein the first dimension size is one of a horizontal dimension size or a vertical dimension size.
The UE of claim 1, wherein each respective set of antenna port indices includes one or more antenna ports of a first polarization and one or more antenna ports of a second polarization.
The UE of claim 1, wherein a total quantity of antenna ports at the network entity used to transmit the set of channel state information reference signals is greater than 32.
The UE of claim 1, wherein each subset of channel state information reference signal resources is associated with a respective transmission configuration indicator state and a respective quasi-co-location source reference signal.
A network entity, comprising:

one or more memories storing processor-executable code; and

one or more processors coupled with the one or more memories and individually or collectively operable to execute the code to cause the network entity to:

transmit, to a user equipment (UE) , control signaling indicating a set of channel state information reference signal resources, wherein the set of channel state information reference signal resources comprises a plurality of groups of channel state information reference signal resources, each group of the plurality of groups is associated with a respective set of antenna port indices at the network entity, wherein the set of channel state information reference signal resources comprises a plurality of subsets of channel state information reference signal resources, and wherein each subset of channel state information reference signal resources includes one channel state information reference signal resource from each group;

transmit, to the UE, a set of channel state information reference signals via the set of channel state information reference signal resources; and

receive, from the UE based at least in part on the set of channel state information reference signals, an uplink control message indicating one or more subsets of the plurality of subsets of channel state information reference signal resources.
The network entity of claim 16, wherein the one or more processors are individually or collectively further operable to execute the code to cause the network entity to:

transmit second control signaling indicating a preconfigured quantity of subsets to report, wherein a quantity of the one or more subsets of the plurality of subsets indicated by the uplink control message is equal to the preconfigured quantity of subsets.
The network entity of claim 16, wherein the one or more processors are individually or collectively further operable to execute the code to cause the network entity to:

transmit second control signaling indicating a threshold quantity of subsets to report, wherein a quantity of the one or more subsets of the plurality of subsets indicated by the uplink control message is less than or equal to the threshold quantity of subsets.
The network entity of claim 16, wherein, to receive the uplink control message, the one or more processors are individually or collectively operable to execute the code to cause the network entity to:

receive a respective channel state feedback report for each of the one or more subsets, wherein a quantity of the one or more subsets is greater than one.
The network entity of claim 19, wherein the one or more processors are individually or collectively further operable to execute the code to cause the network entity to:

receive, from the UE and prior to reception of the uplink control message, a second uplink control message indicating the quantity of the one or more subsets.
The network entity of claim 20, wherein:

the second uplink control message indicates respective quantities of subsets for each of a plurality of channel state feedback reporting occasions, and

the uplink control message is one of the plurality of channel state feedback reporting occasions.
The network entity of claim 21, wherein, to receive the second uplink control message, the one or more processors are individually or collectively operable to execute the code to cause the network entity to:

receive the second uplink control message via a medium access control (MAC) control element.
The network entity of claim 16, wherein the one or more processors are individually or collectively further operable to execute the code to cause the network entity to:

transmit, via the control signaling, an indication of a same respective power offset value for each channel state information reference signal resource within a same subset of channel state information reference signal resources.
The network entity of claim 16, wherein the one or more processors are individually or collectively further operable to execute the code to cause the network entity to:

transmit, via the control signaling, an indication of a same respective resource block for each channel state information reference signal resource within a same subset of channel state information reference signal resources.
The network entity of claim 16, wherein each channel state information reference signal resource within a same subset of channel state information reference signal resources is scheduled within a threshold duration without a switch between uplink and downlink.
The network entity of claim 16, wherein the one or more processors are individually or collectively further operable to execute the code to cause the network entity to:

transmit, via the control signaling, an indication of a first dimension size associated with a channel state information report setting and an indication of a second dimension size associated with the channel state information report setting, wherein the first dimension size is split equally into a quantity of multiples for channel state information reference signal port indexing of the plurality of groups of channel state information reference signal resources.
The network entity of claim 26, wherein the first dimension size is one of a horizontal dimension size or a vertical dimension size.
The network entity of claim 16, wherein each respective set of antenna port indices includes one or more antenna ports of a first polarization and one or more antenna ports of a second polarization.
A method for wireless communications at a user equipment (UE) , comprising:

receiving, from a network entity, control signaling indicating a set of channel state information reference signal resources, wherein the set of channel state information reference signal resources comprises a plurality of groups of channel state information reference signal resources, each group of the plurality of groups is associated with a respective set of antenna port indices at the network entity, wherein the set of channel state information reference signal resources comprises a plurality of subsets of channel state information reference signal resources, and wherein each subset of channel state information reference signal resources includes one channel state information reference signal resource from each group;

receiving, from the network entity, a set of channel state information reference signals via the set of channel state information reference signal resources; and

transmit, to the network entity based at least in part on the set of channel state information reference signals, an uplink control message indicating one or more subsets of the plurality of subsets of channel state information reference signal resources.
A method for wireless communications at a network entity, comprising:

transmitting, to a user equipment (UE) , control signaling indicating a set of channel state information reference signal resources, wherein the set of channel state information reference signal resources comprises a plurality of groups of channel state information reference signal resources, each group of the plurality of groups is associated with a respective set of antenna port indices at the network entity, wherein the set of channel state information reference signal resources comprises a plurality of subsets of channel state information reference signal resources, and wherein each subset of channel state information reference signal resources includes one channel state information reference signal resource from each group;

transmitting, to the UE, a set of channel state information reference signals via the set of channel state information reference signal resources; and

receiving, from the UE based at least in part on the set of channel state information reference signals, an uplink control message indicating one or more subsets of the plurality of subsets of channel state information reference signal resources.