Method for physical resource block bundling for a channel state information reference signal
The implementation of PRB bundling methods for CSI-RS in frequency and time-domains addresses the lack of clear configurations, enhancing measurement accuracy and reducing performance degradation in wireless communication systems.
Patent Information
- Authority / Receiving Office
- WO · WO
- Patent Type
- Applications
- Current Assignee / Owner
- GOOGLE LLC
- Filing Date
- 2024-11-07
- Publication Date
- 2026-05-15
AI Technical Summary
Existing wireless communication systems lack clear definitions for physical resource block (PRB) bundling sizes and configurations for channel state information reference signals (CSI-RS), leading to performance degradation due to discontinuous precoded channels and inaccurate measurements.
Implement methods for PRB bundling in both frequency-domain and time-domain for CSI-RS, including explicit or implicit determinations based on allocated resource blocks, bandwidth parts, and reference bandwidths, with flexible and fixed-length configurations for improved measurement and reporting.
Enhances the performance of wireless communication systems by providing clear PRB bundling configurations for CSI-RS, improving measurement accuracy and reducing performance degradation.
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Figure CN2024130482_15052026_PF_FP_ABST
Abstract
Description
METHOD FOR PHYSICAL RESOURCE BLOCK BUNDLING FOR A CHANNEL STATE INFORMATION REFERENCE SIGNALTECHNICAL FIELD
[0001] The present disclosure relates generally to wireless communication, and more particularly, to physical resource block (PRB) bundling for a channel state information reference signal (CSI-RS) .BACKGROUND
[0002] The Third Generation Partnership Project (3GPP) specifies a radio interface referred to as fifth generation (5G) new radio (NR) (5G NR) . An architecture for a 5G NR wireless communication system includes a 5G core (5GC) network, a 5G radio access network (5G-RAN) , a user equipment (5G UE) , etc. The 5G NR architecture seeks to provide increased data rates, decreased latency, and / or increased capacity compared to prior generation cellular communication systems.
[0003] Wireless communication systems, in general, provide various telecommunication services (e.g., telephony, video, data, messaging, etc. ) based on multiple-access technologies, such as orthogonal frequency division multiple access (OFDMA) technologies, that support communication with multiple UEs. Improvements in mobile broadband continue the progression of such wireless communication technologies. For example, a network entity may apply precoder (s) to a CSI-RS at different granularities in a frequency-domain and / or the network entity may transmit the CSI-RS in multiple transmission occasions in a time-domain. Details pertaining to identifying a PRB bundling size associated with the CSI-RS and / or details pertaining to identifying a PRB bundling in a time-domain for the multiple transmission occasions may be undefined.
[0004] BRIEF SUMMARY
[0005] The following presents a simplified summary of one or more aspects in order to provide a basic understanding of such aspects. This summary is not an extensive overview of all contemplated aspects. This summary neither identifies key or critical elements of all aspects nor delineates the scope of any or all aspects. Its sole purpose is to present some concepts of one or more aspects in a simplified form as a prelude to the more detailed description that is presented later.
[0006] A network entity, such as a base station or a unit of a base station, may communicate with a user equipment (UE) . In an example, the network entity communicates with the UE via a multiple-input multiple-output (MIMO) system that uses multiple antennas to improve a quality, capacity, and throughput of a radio link between the network entity and the UE. A network entity (e.g., a network entity using a MIMO system) may configure a UE to transmit a channel state information (CSI) report to the network entity. The network entity transmits a channel state information reference signal (CSI-RS) to the UE. The UE performs measurements on the CSI-RS and transmits a CSI report to the network entity based on the measurements. The CSI report may include information that enables the network entity to select a digital precoder for the UE. The network entity may also configure the UE to monitor performance for artificial intelligence (AI) and / or machine learning (ML) functionalities or models based on CSI-RS resource (s) . The UE reports performance monitoring results to the network entity based on measurements of the CSI-RS resource (s) . In this regard, the network entity may determine whether the AI and / or ML functionalities or models fail based on the reported performance monitoring results.
[0007] In some aspects, the network entity transmits one or multiple precoded CSI-RS resources for CSI acquisition and / or performance monitoring for AI / ML. The UE may detect a precoded channel based on a CSI-RS associated with the one or multiple precoded CSI-RS resources. The network entity can apply precoders in different granularities in a frequency-domain; however, the different granularities are unknown to the UE, which may affect an ability of the UE to receive the CSI-RS transmitted by the network entity. In an example, the UE performs block-wise channel estimation for a CSI-RS assuming that a channel in each block is highly correlated (e.g., continuous) . However, different precoders within a block used by the network entity could result in a discontinuous precoded channel, which could lead to performance degradation. Thus, details pertaining to identifying a physical resource block (PRB) bundling size for a CSI-RS resource may be undefined, where a PRB bundle may indicate a precoder resource block group (PRG) including a set of PRBs based on a common precoder. The network entity may also transmit a CSI-RS in multiple transmission occasions in a time-domain. The UE then measures the CSI-RS transmitted in the multiple transmission occasions to improve measurement accuracy. However, if the network entity transmits the CSI-RS in multiple transmission occasions in the time-domain using different precoders, performing joint measurement on the CSI-RS could lead to performance degradation. Thus, details pertaining to identifying a PRB bundling in a time-domain for multiple transmission occasions of a CSI-RS may be undefined. Moreover, for a CSI-RS with PRB bundling, details as to how to perform measurements and information that is to be reported for CSI acquisition and / or performance monitoring may be undefined.
[0008] Aspects of the present disclosure address the above-noted and other deficiencies by implementing methods for PRB bundling for a CSI-RS. For example, the present disclosure describes frequency-domain PRB bundling for a CSI-RS. Frequency-domain PRB bundling may be based on an explicit or an implicit determination. In some aspects, the present disclosure details determining a PRG based on: allocated resource block (RBs) for a CSI-RS, RBs for a bandwidth part, or a reference bandwidth. In other aspects, the present disclosure describes time-domain bundling for a CSI-RS. Time-domain PRB bundling may be based on an explicit configuration or an implicit configuration. The present disclosure describes fixed length time-domain bundling and flexible length time-domain bundling. The present disclosure further describes measurements and reporting for a CSI-RS with frequency-domain PRB bundling and / or time-domain PRB bundling. Vis-à-vis the various methods for PRB bundling describe herein, performance of a wireless communication system may be improved.
[0009] According to some aspects, a UE receives, from a network entity, control signaling configuring: a channel state information reference signal (CSI-RS) resource with a physical resource block (PRB) bundling configuration; and a report configuration based on the CSI-RS resource. The UE receives, from the network entity, a CSI-RS corresponding to the CSI-RS resource. The UE transmits, to the network entity, a report based on the report configuration and the CSI-RS.
[0010] According to some aspects, a network entity transmits, to a UE, control signaling configuring: a channel state information reference signal (CSI-RS) resource with a physical resource block (PRB) bundling configuration; and a report configuration based on the CSI-RS resource. The network entity transmits, to the UE, a CSI-RS corresponding to the CSI-RS resource. The network entity receives, from the UE, a report based on the report configuration and the CSI-RS.BRIEF DESCRIPTION OF THE DRAWINGS
[0011] FIG. 1 illustrates a diagram of a wireless communications system that includes a plurality of user equipments (UEs) and network entities in communication over one or more cells according to an embodiment.
[0012] FIG. 2 is a diagram illustrating an example of a channel state information reference signal (CSI-RS) reception with a frequency-domain precoder granularity mismatch according to an embodiment.
[0013] FIG. 3 is a diagram illustrating an example of a CSI-RS reception with a time-domain precoder granularity mismatch according to an embodiment.
[0014] FIG. 4 is a signaling diagram illustrating communications between a user equipment (UE) and a network entity for physical resource block (PRB) bundling for a CSI-RS according to an embodiment.
[0015] FIG. 5A is a diagram illustrating an example of UE behavior for PRB bundling for a CSI-RS according to an embodiment.
[0016] FIG. 5B is a diagram illustrating an example network entity behavior for PRB bundling for a CSI-RS according to an embodiment.
[0017] FIG. 6 is a diagram illustrating an example of determining a precoder resource block group (PRG) based on allocated resource blocks (RBs) for a CSI-RS according to an embodiment.
[0018] FIG. 7 is a diagram illustrating an example of determining a PRG based on RBs for a bandwidth part (BWP) according to an embodiment.
[0019] FIG. 8 is a diagram illustrating an example of determining a PRG based on a reference bandwidth according to an embodiment.
[0020] FIG. 9 is a diagram illustrating an example of determining a PRG based on a configured subband size according to an embodiment.
[0021] FIG. 10 is a diagram illustrating an example of determining a PRG based on a subband size for a linked report according to an embodiment.
[0022] FIG. 11 is a diagram illustrating an example of a fixed-length time-domain bundling window configuration according to an embodiment.
[0023] FIG. 12 is a diagram illustrating an example of a flexible length time-domain bundling window based on control signaling according to an embodiment.
[0024] FIG. 13 is a diagram illustrating an example of a flexible length time-domain bundling window based on an event according to an embodiment.
[0025] FIG. 14A is a diagram illustrating an example of a time-domain bundling window when cell discontinuous transmission (DTX) or UE discontinuous reception (DRX) is not configured or not activated according to an embodiment.
[0026] FIG. 14B is a diagram illustrating an example of a time-domain bundling window when cell DTX or UE DRX is configured or activated according to an embodiment.
[0027] FIG. 15 is a flowchart of a method of wireless communication at a UE according to an embodiment.
[0028] FIG. 16 is a flowchart of a method of wireless communication at a network entity according to an embodiment.
[0029] FIG. 17 is a diagram illustrating a hardware implementation for an example UE apparatus according to some embodiments.
[0030] FIG. 18 is a diagram illustrating a hardware implementation for one or more example network entities according to some embodiments.DETAILED DESCRIPTION
[0031] FIG. 1 illustrates a diagram 100 of a wireless communications system associated with a plurality of cells 190. The wireless communications system includes user equipments (UEs) 102 and base stations / network entities 104. Some base stations may include an aggregated base station architecture and other base stations may include a disaggregated base station architecture. The aggregated base station architecture utilizes a radio protocol stack that is physically or logically integrated within a single radio access network (RAN) node. A disaggregated base station architecture utilizes a protocol stack that is physically or logically distributed among two or more units (e.g., radio unit (RU) 106, distributed unit (DU) 108, central unit (CU) 110) . For example, a CU 110 is implemented within a RAN node, and one or more DUs 108 may be co-located with the CU 110, or alternatively, may be geographically or virtually distributed throughout one or multiple other RAN nodes. The DUs 108 may be implemented to communicate with one or more RUs 106. Any of the RU 106, the DU 108 and the CU 110 can be implemented as virtual units, such as a virtual radio unit (VRU) , a virtual distributed unit (VDU) , or a virtual central unit (VCU) . The base station / network entity 104 (e.g., an aggregated base station or disaggregated units of the base station, such as the RU 106 or the DU 108) , may be referred to as a transmission reception point (TRP) .
[0032] Operations of the base station 104 and / or network designs may be based on aggregation characteristics of base station functionality. For example, disaggregated base station architectures are utilized in an integrated access backhaul (IAB) network, an open-radio access network (O-RAN) network, or a virtualized radio access network (vRAN) , which may also be referred to a cloud radio access network (C-RAN) . Disaggregation may include distributing functionality across the two or more units at various physical locations, as well as distributing functionality for at least one unit virtually, which can enable flexibility in network designs. The various units of the disaggregated base station architecture, or the disaggregated RAN architecture, can be configured for wired or wireless communication with at least one other unit. For example, the base stations 104d, 104e and / or the RUs 106a, 106b, 106c, 106d may communicate with the UEs 102a, 102b, 102c, 102d, and / or 102s via one or more radio frequency (RF) access links based on a Uu interface. In examples, multiple RUs 106 and / or base stations 104 may simultaneously serve the UEs 102, such as by intra-cell and / or inter-cell access links between the UEs 102 and the RUs 106 / base stations 104.
[0033] The RU 106, the DU 108, and the CU 110 may include (or may be coupled to) one or more interfaces configured to transmit or receive information / signals via a wired or wireless transmission medium. For example, a wired interface can be configured to transmit or receive the information / signals over a wired transmission medium, such as via the fronthaul link 160 between the RU 106d and the baseband unit (BBU) 112 of the base station 104d associated with the cell 190d. The BBU 112 includes a DU 108 and a CU 110, which may also have a wired interface (e.g., midhaul link) configured between the DU 108 and the CU 110 to transmit or receive the information / signals between the DU 108 and the CU 110. In further examples, a wireless interface, which may include a receiver, a transmitter, or a transceiver, such as an RF transceiver, configured to transmit and / or receive the information / signals via the wireless transmission medium, such as for information communicated between the RU 106a of the cell 190a and the base station 104e of the cell 190e via cross-cell communication beams 136-138 of the RU 106a and the base station 104e.
[0034] The RUs 106 may be configured to implement lower layer functionality. For example, the RU 106 is controlled by the DU 108 and may correspond to a logical node that hosts RF processing functions, or lower layer PHY functionality, such as execution of fast Fourier transform (FFT) , inverse FFT (iFFT) , digital beamforming, physical random access channel (PRACH) extraction and filtering, etc. The functionality of the RU 106 may be based on the functional split, such as a functional split of lower layers.
[0035] The RUs 106 may transmit or receive over-the-air (OTA) communication with one or more UEs 102. For example, the RU 106b of the cell 190b communicates with the UE 102b of the cell 190b via a first set of communication beams 132 of the RU 106b and a second set of communication beams 134b of the UE 102b, which may correspond to inter-cell communication beams or, in some examples, cross-cell communication beams. For instance, the UE 102b of the cell 190b may communicate with the RU 106a of the cell 190a via a third set of communication beams 134a of the UE 102b and a fourth set of communication beams 136 of the RU 106a. DUs 108 can control both real-time and non-real-time features of control plane and user plane communications of the RUs 106.
[0036] Any combination of the RU 106, the DU 108, and the CU 110, or reference thereto individually, may correspond to a base station 104. Thus, the base station 104 may include at least one of the RU 106, the DU 108, or the CU 110. The base stations 104 provide the UEs 102 with access to a core network. The base stations 104 may relay communications between the UEs 102 and the core network (not shown) . The base stations 104 may be associated with macrocells for higher-power cellular base stations and / or small cells for lower-power cellular base stations. For example, the cell 190e may correspond to a macrocell, whereas the cells 190a-190d may correspond to small cells. Small cells include femtocells, picocells, microcells, etc. A network that includes at least one macrocell and at least one small cell may be referred to as a “heterogeneous network. ”
[0037] Transmissions from a UE 102 to a base station 104 / RU 106 are referred to as uplink (UL) transmissions, whereas transmissions from the base station 104 / RU 106 to the UE 102 are referred to as downlink (DL) transmissions. Uplink transmissions may also be referred to as reverse link transmissions and downlink transmissions may also be referred to as forward link transmissions. For example, the RU 106d utilizes antennas of the base station 104d of cell 190d to transmit a downlink / forward link communication to the UE 102d or receive an uplink / reverse link communication from the UE 102d based on the Uu interface associated with the access link between the UE 102d and the base station 104d / RU 106d.
[0038] Communication links between the UEs 102 and the base stations 104 / RUs 106 may be based on multiple-input and multiple-output (MIMO) antenna technology, including spatial multiplexing, beamforming, and / or transmit diversity. The communication links may be associated with one or more carriers. The UEs 102 and the base stations 104 / RUs 106 may utilize a spectrum bandwidth of Y MHz (e.g., 5, 10, 15, 20, 100, 400, 800, 1600, 2000, etc. MHz) per carrier allocated in a carrier aggregation of up to a total of Yx MHz, where x component carriers (CCs) are used for communication in each of the uplink and downlink directions. The carriers may or may not be adjacent to each other along a frequency spectrum. In examples, uplink and downlink carriers may be allocated in an asymmetric manner, with more or fewer carriers allocated to either the uplink or the downlink. A primary component carrier and one or more secondary component carriers may be included in the component carriers. The primary component carrier may be associated with a primary cell (PCell) and a secondary component carrier may be associated with a secondary cell (SCell) .
[0039] Some UEs 102, such as the UEs 102a and 102s, may perform device-to-device (D2D) communications over sidelink. For example, a sidelink communication / D2D link utilizes a spectrum for a wireless wide area network (WWAN) associated with uplink and downlink communications. Such sidelink / D2D communication may be performed through various wireless communications systems, such as wireless fidelity (Wi-Fi) systems, Bluetooth systems, Long Term Evolution (LTE) systems, New Radio (NR) systems, etc.
[0040] The UEs 102 and the base stations 104 / RUs 106 may each include a plurality of antennas. The plurality of antennas may correspond to antenna elements, antenna panels, and / or antenna arrays that may facilitate beamforming operations. For example, the RU 106b transmits a downlink beamformed signal based on a first set of communication beams 132 to the UE 102b in one or more transmit directions of the RU 106b. The UE 102b may receive the downlink beamformed signal based on a second set of communication beams 134b from the RU 106b in one or more receive directions of the UE 102b. In a further example, the UE 102b may also transmit an uplink beamformed signal (e.g., sounding reference signal (SRS) ) to the RU 106b based on the second set of communication beams 134b in one or more transmit directions of the UE 102b. The RU 106b may receive the uplink beamformed signal from the UE 102b in one or more receive directions of the RU 106b. The UE 102b may perform beam training to determine the best receive and transmit directions for the beamformed signals. The transmit and receive directions for the UEs 102 and the base stations 104 / RUs 106 may or may not be the same.
[0041] In further examples, beamformed signals may be communicated between a first base station / RU 106a and a second base station 104e. For instance, the base station 104e of the cell 190e may transmit a beamformed signal to the RU 106a based on the communication beams 138 in one or more transmit directions of the base station 104e. The RU 106a may receive the beamformed signal from the base station 104e of the cell 190e based on the RU communication beams 136 in one or more receive directions of the RU 106a. In further examples, the base station 104e transmits a downlink beamformed signal to the UE 102e based on the communication beams 138 in one or more transmit directions of the base station 104e. The UE 102e receives the downlink beamformed signal from the base station 104e based on UE communication beams 130 in one or more receive directions of the UE 102e. The UE 102e may also transmit an uplink beamformed signal to the base station 104e based on the UE communication beams 130 in one or more transmit directions of the UE 102e, such that the base station 104e may receive the uplink beamformed signal from the UE 102e in one or more receive directions of the base station 104e.
[0042] The base station 104 may include and / or be referred to as a network entity. That is, “network entity” may refer to the base station 104 or at least one unit of the base station 104, such as the RU 106, the DU 108, and / or the CU 110. The base station 104 may also include and / or be referred to as a next generation evolved Node B (ng-eNB) , a next generation NB (gNB) , an evolved NB (eNB) , an access point, a base transceiver station, a radio base station, a radio transceiver, a transceiver function, a basic service set (BSS) , an extended service set (ESS) , a TRP, a network node, network equipment, or other related terminology. The base station 104 or an entity at the base station 104 can be implemented as an IAB node, a relay node, a sidelink node, an aggregated (monolithic) base station, or a disaggregated base station including one or more RUs 106, DUs 108, and / or CUs 110. A set of aggregated or disaggregated base stations may be referred to as a next generation-radio access network (NG-RAN) . In some examples, the UE 102a operates in dual connectivity (DC) with the base station 104e and the base station / RU 106a. In such cases, the base station 104e can be a master node and the base station / RU 160a can be a secondary node.
[0043] Still referring to FIG. 1, in certain aspects, any of the UEs 102 may include a PRB bundling component 140 configured to receive, from a network entity, control signaling configuring: a channel state information reference signal (CSI-RS) resource with a physical resource block (PRB) bundling configuration; and a report configuration based on the CSI-RS resource. The PRB bundling component 140 is configured to receive, from the network entity, a CSI-RS corresponding to the CSI-RS resource. The PRB bundling component 140 is configured to transmit, to the network entity, a report based on the report configuration and the CSI-RS.
[0044] In certain aspects, any of the base stations 104 or a network entity of the base stations 104 may include a PRB bundling configuration component 150 configured to transmit, to a UE, control signaling configuring: a channel state information reference signal (CSI-RS) resource with a physical resource block (PRB) bundling configuration; and a report configuration based on the CSI-RS resource. The PRB bundling configuration component 150 is configured to transmit, to the UE, a CSI-RS corresponding to the CSI-RS resource. The PRB bundling configuration component 150 is configured to receive, from the UE, a report based on the report configuration and the CSI-RS.
[0045] Accordingly, FIG. 1 describes a wireless communication system that may be implemented in connection with aspects of one or more other figures described herein. Further, although the following description may be focused on 5G NR, the concepts described herein may be applicable to other similar areas, such as 5G-Advanced and future versions, LTE, LTE-advanced (LTE-A) , and other wireless technologies, such as 6G.
[0046] For a multiple-input multiple-output (MIMO) system, channel state information (CSI) can provide information for the network entity 104 to select a digital precoder for the UE 102. The network entity 104 can configure a CSI report using radio resource control (RRC) signaling (e.g., CSI-ReportConfig) . The UE 102 can use a channel state information reference signal (CSI-RS) as a channel measurement resource (CMR) for the UE 102 to measure a downlink channel. Meanwhile, the network entity 104 can configure an interference measurement resource (IMR) for the UE 102 to measure interference.
[0047] In a CSI report configuration, the network entity 104 can configure a report quantity for the CSI report. The report quantity may include one or multiple of the following: a synchronization signal block (SSB) resource indicator (SSBRI) , a CSI- RS resource indicator (CRI) , a rank indicator (RI) , a precoder matrix indicator (PMI) , a channel quality indicator (CQI) , a layer indicator (LI) , a time-domain channel property (TDCP) , a delay offset (DO) , a frequency offset (FO) , a phase offset (PO) , a layer 1 reference signal received power (L1-RSRP) , a layer 1 signal-to-interference plus noise ratio (L1-SINR) , or a received signal strength indication (RSSI) . The SSBRI indicates one of the configured SSB resources for the CSI report. The CRI indicates one of the configured CSI-RS resources for the CSI report. The RI and the PMI indicate a digital precoder. The CQI indicates a signal-to-interference plus noise (SINR) status in order to assist the network entity 104 in determining a modulation and coding scheme (MCS) . The LI identifies a strongest layer for the reported precoder indicated by the RI and the PMI. The TDCP indicates a cross-correlation for a channel in different time-domains, which may reflect a channel variance speed. The DO indicates a delay difference between two CSI-RS resource sets (e.g., two transmission and reception points (TRPs) ) . The FO indicates a frequency difference between two CSI-RS resource sets (e.g., two TRPs) . The PO indicates an uplink and a downlink channel phase difference between two CSI-RS resources (e.g., two TRPs) . The L1-RSRP indicates a signal quality for each resource element (RE) . The L1-SINR indicates a SINR for each RE. The RSSI indicates an interference strength. For each report quantity described above, the network entity 104 can configure the UE 102 to report one or multiple values based on different CMRs / IMRs.
[0048] Furthermore, the network entity 104 can configure the UE 102 to perform performance monitoring for some artificial intelligence (AI) / machine learning (ML) functionalities or models by one or multiple CSI-RS resources. Based on measurement (s) of the CSI-RS resource (s) , the UE 102 can report performance monitoring results (e.g., whether one or multiple AI / ML functionalities or models fail or do not fail) or the UE 102 can report intermediate results (e.g., a CQI, a hypothetical block error ratio (BLER) , a signal-to-interference noise ratio (SINR) , a reference signal received power (RSRP) etc. ) . The network entity 104 can determine whether one or multiple AI / ML functionalities or models fail or do not fail based on the reported intermediate results.
[0049] FIG. 2 is a diagram 200 illustrating an example of a channel state information reference signal (CSI-RS) reception with a frequency-domain precoder granularity mismatch according to an embodiment. For CSI acquisition and / or performance monitoring for AI / ML, the network entity 104 can transmit one or multiple precoded CSI-RS resources. The UE 102 can detect a precoded channel based on the CSI-RS (i.e., based on the one or multiple precoded CSI-RS resources) .
[0050] In one resource element (RE) k allocated for a CSI-RS, the UE 102 can obtain a received signal in a frequency-domain according to equation (I) below. (I) Yk=HkWkXk+Nk
[0051] In equation (I) , Hk is a frequency-domain channel, Wk is a precoder applied to the CSI-RS, Xk is a CSI-RS signal before the precoder is applied, and Nk is the noise and inference.
[0052] The UE 102 only knows a CSI-RS signal before the network entity 104 applies the precoder. Thus, the UE 102 may identify a precoded channel based on a received signal and the CSI-RS signal before the network entity 104 applies the precoder. In an example, the estimated precoded channel is HkWk.
[0053] The network entity 104 can apply precoders in different granularities in a frequency-domain. The UE 102 may not have knowledge pertaining to the precoders applied in different granularities in the frequency-domain. As such, the UE 102 may not perform proper granularity determination for CSI-RS reception. The UE 102 may perform block-wise channel estimation for a CSI-RS assuming a channel in each block is highly correlated with another channel in another block (e.g., continuous) . However, the network entity 104 can apply different precoders within a block which could result in discontinuous precoded channel, which could lead to performance degradation. Thus, how to identify a PRB bundling size for a CSI-RS resource could be an issue, where a PRB bundle may indicate a PRG including a set of PRBs based on a common precoder.
[0054] The diagram 200 depicts a PRG 202 (i.e., a PRG in / on a network side) and a CSI-RS reception block 204 (i.e., a CSI-RS reception block in / on a UE side) . As depicted in the diagram 200, a mismatch 206 may exist between the PRG 202 and the CSI-RS reception block 204. The mismatch 206 may lead to performance degradation.
[0055] FIG. 3 is a diagram 300 illustrating an example of a CSI-RS reception with a time-domain precoder granularity mismatch according to an embodiment. The network entity 104 can transmit a CSI-RS in multiple transmission occasions in a time-domain. The UE 102 can measure the CSI-RS by multiple transmission occasions to improve a measurement accuracy. However, if the multiple CSI-RS transmission occasions are based on different precoders, performing joint measurements by the UE 102 could also lead to performance degradation. Then, how to identify PRB bunding in the time-domain for multiple transmission occasions of the CSI-RS could be an issue.
[0056] The diagram 300 depicts multiple transmission occasions of a CSI-RS based on a first precoder 308a and multiple transmission occasions of a CSI-RS based on a second precoder 308b. The diagram 300 also depicts a UE-side bundling size for joint measurement 312. In an example, performing joint measurements on the transmission occasions corresponding to the UE-side bundling size for joint measurement 312 may lead to performance degradation.
[0057] Further, for a CSI-RS with PRB bundling, how to perform measurement (s) and information to be reported for CSI acquisition and / or performance monitoring could be another issue.
[0058] The present disclosure describes procedures for PRB bundling for a CSI-RS. The present disclosure describes a frequency-domain PRB bundling configuration for a CSI-RS, a time-domain PRB bundling (e.g., a time-domain PRB bundling configuration) for the CSI-RS, and measurement and reporting details based on a CSI-RS with frequency-domain and / or time-domain PRB bundling.
[0059] As used herein, unless otherwise specified, RRC signaling may indicate an RRC reconfiguration message from the network entity 104 to the UE 102, or the RRC signaling may indicate a system information block (SIB) . In an example, the SIB is an existing SIB (e.g., system information block 1 (SIB1) ) or a new SIB (e.g., SIB J, where J is an integer above 21) transmitted by the network entity 104. In some aspects, the network entity 104 receives a UE capability from the UE 102, from a core network (e.g., an Access and Mobility Management Function (AMF) ) , or from another network entity.
[0060] FIG. 4 is a signaling diagram 400 illustrating communications between a UE 102 and a network entity 104 for PRB bundling for a CSI-RS according to an embodiment. The PRB bundling for the CSI-RS may be in a time-domain and / or a frequency-domain. The UE 102 optionally transmits 414 (i.e., reports) and the network entity 104 optionally receives 414 UE capabilities indicating supported configurations for the PRB bundling for a CSI-RS. In an example, the UE 102 reports at least one of the following UE capabilities: whether the UE 102 supports PRB bundling for the CSI-RS in the time-domain, the frequency-domain, or a joint time and frequency-domain, a supported minimum or maximum bundling size (PRG size) in the frequency- domain, a supported minimum or maximum bundling size (time-domain bundling size) in the time-domain, supported types of CSI-RSs for PRB bundling (e.g., a CSI-RS for beam management or a CSI-RS for CSI acquisition) , supported report configuration (s) (e.g., CSI acquisition and / or performance monitoring for AI / ML functionality / models) based on the CSI-RS for PRB bundling in the time-domain and / or the frequency-domain.
[0061] The network entity 104 (e.g., based on the received UE capabilities) transmits 418 and the UE receives 418 control signaling configuring a CSI-RS resource or a CSI-RS resource set with a PRB bundling configuration in the time and / or frequency-domain and configuring a first report configuration based on the CSI-RS resource or the CSI-RS resource set. The control signaling optionally configures a second report configuration that is linked with the first report configuration or a sounding reference signal (SRS) associated with the CSI-RS resource or the CSI-RS resource set. In some aspects, the network entity 104 configures the SRS associated with the first report configuration. The network entity 104 can configure the first report configuration for CSI acquisition or performance monitoring for AI / ML model / functionality (e.g., the first report configuration may be associated with an associated identifier (ID) for an additional condition indication, a model ID for AI / ML model identification, and / or a dataset ID for training data set identification) . The network entity 104 can configure the second report configuration for CSI acquisition or with an inference configuration for an AI / ML functionality or model (e.g., the second report configuration may be associated with an associated ID for an additional condition indication, a model ID for AI / ML model identification, and / or a dataset ID for training data set identification) . In the first report configuration, the network entity 104 can configure a first CSI-RS resource or a first CSI-RS resource set with PRB bundling as a channel measurement resource and the network entity 104 can configure a second CSI-RS resource or a second CSI-RS resource set with PRB bundling as an interference measurement resource.
[0062] The network entity 104 can transmit the control signaling by RRC signaling (e.g., RRCReconfiguration) . The network entity 104 can provide some of the configurations (e.g., the first configuration, the second configuration, etc. ) or update some of the configurations by a medium access control (MAC) control element (CE) (MAC-CE) (e.g., a MAC-CE activating a (semi-persistent) CSI report) or by downlink control information (DCI) (e.g., different triggering states for a DCI triggering an (aperiodic) CSI report may correspond to different configurations) .
[0063] The UE 102 optionally transmits 422 and the network entity 104 optionally receives 422 a second report corresponding to the second report configuration. The UE 102 may report precoder information in the second report. Alternatively, the UE 102 can transmit the SRS associated with the CSI-RS resource. The network entity 104 can use the SRS for downlink CSI acquisition to determine a precoder for the CSI-RS.
[0064] The network entity 104 optionally transmits 426 and the UE 102 optionally receives 426 control signaling (e.g., a MAC-CE or DCI) activating or triggering the configured first report configuration and / or the configured CSI-RS resources for channel measurement and / or the configured CSI-RS / CSI-IM for interference measurement. The control signaling optionally indicates a PRB bundling configuration for the CSI-RS.
[0065] The network entity 104 transmits 430 (e.g., based on the received precoder information in the second report) and the UE 102 receives 430 a CSI-RS on the configured CSI-RS resource for channel measurement based on the PRB bundling configuration in the time-domain and / or the frequency-domain. In some aspects, the CSI-RS is transmitted on a configured CSI-RS resource for interference measurement (IM) or a CSI-IM resource based on the PRB bundling configuration.
[0066] The UE 102 transmits 434 and the network entity 104 receives 434 a first report based on the received CSI-RS and the first report configuration. In an example, the UE 102 transmits the first report by an RRC message (e.g., an RRC message for performance monitoring) , a MAC-CE (e.g., a MAC-CE for performance monitoring, ) uplink control information (UCI) on a physical uplink control channel (PUCCH) (e.g., a short PUCCH (aPUCCH with less than 4 symbols) or a long PUCCH (aPUCCH with 4 or more symbols) , or a physical uplink shared channel (PUSCH) .
[0067] FIG. 5A is a diagram 500A illustrating an example of UE behavior for PRB bundling for a CSI-RS according to an embodiment. The UE 102 optionally transmits 514a (i.e., reports) UE capabilities indicating supported configurations for the PRB bundling for a CSI-RS. In an example, the UE 102 reports at least one of the following UE capabilities: whether the UE 102 supports PRB bundling for the CSI-RS in the time-domain, the frequency-domain, or a joint time and frequency-domain, a supported minimum or maximum bundling size (PRG size) in the frequency-domain, a supported minimum or maximum bundling size (time-domain bundling size) in the time-domain, supported types of CSI-RSs for PRB bundling (e.g., a CSI-RS for beam management or a CSI-RS for CSI acquisition) , supported report configuration (s) (e.g., CSI acquisition and / or performance monitoring for AI / ML functionality / models) based on the CSI-RS for PRB bundling in the time and / or the frequency-domain.
[0068] The UE 102 receives 518a control signaling configuring a CSI-RS resource or a CSI-RS resource set with a PRB bundling configuration in the time and / or frequency-domain and configuring a first report configuration based on the CSI-RS resource or CSI-RS resource set. The control signaling optionally configures a second report configuration that is linked with the first report configuration or an SRS associated with the CSI-RS resource or the CSI-RS resource set.
[0069] The UE 102 can receive the control signaling by RRC signaling (e.g., RRCReconfiguration) . The UE 102 may obtain some of the configurations (e.g., the first configuration, the second configuration, etc. ) or update some of the configurations by a MAC-CE (e.g., a MAC-CE activating a (semi-persistent) CSI report) or by DCI (e.g., different triggering states for a DCI triggering an (aperiodic) CSI report may correspond to different configurations) .
[0070] The UE 102 optionally transmits 522a a second report corresponding to the second report configuration. The UE 102 may report precoder information in the second report. Alternatively, the UE 102 can transmit the SRS associated with the CSI-RS resource.
[0071] The UE 102 optionally receives 526a control signaling (e.g., a MAC-CE or DCI) activating or triggering the configured first report configuration and / or the configured CSI-RS resources for channel measurement and / or the configured CSI-RS / CSI-IM for interference measurement. The control signaling optionally indicates the PRB bundling configuration for the CSI-RS.
[0072] The UE 102 optionally determines 527a a PRG based on at least one of allocated RBs for the CSI-RS, RBs for a bandwidth part, a reference bandwidth, a bandwidth of the CSI-RS, a configured frequency-domain granularity for the report, or a frequency-domain granularity for a linked report.
[0073] The UE 102 optionally determines 528a a start of the time-domain bundling window based on at least one of an update of at least one RRC parameter for the CSI-RS, bandwidth part switching, transmission of an SRS associated with the CSI-RS resource, transmission of a linked report, an active period of cell DTX operation, an active time of UE DRX operation, or second control signaling indicating a start of the time-domain bundling window.
[0074] The UE 102 receives 530a (e.g., based on the received precoder information in the second report) a CSI-RS on the configured CSI-RS based on the PRB bundling configuration for the time-domain and / or frequency-domain.
[0075] The UE 102 transmits 534a a first report based on the received CSI-RS and the first report configuration. In an example, the UE 102 transmits the first report by an RRC message (e.g., an RRC message for performance monitoring) , a MAC-CE (e.g., a MAC-CE for performance monitoring, ) UCI on a PUCCH (e.g., a short PUCCH (aPUCCH with less than 4 symbols) or a long PUCCH (aPUCCH with 4 or more symbols) , or a PUSCH.
[0076] FIG. 5B is a diagram 500B illustrating an example network entity behavior for PRB bundling for a CSI-RS according to an embodiment. The network entity 104 optionally receives 514b UE capabilities indicating supported configurations for the PRB bundling for a CSI-RS. In an example, the network entity 104 receives at least one of the following UE capabilities: whether the UE 102 supports PRB bundling for the CSI-RS in the time-domain, the frequency-domain, or a joint time and frequency-domain, a supported minimum or maximum bundling size (PRG size) in the frequency-domain, a supported minimum or maximum bundling size (time-domain bundling size) in the time-domain, supported types of CSI-RSs for PRB bundling (e.g., a CSI-RS for beam management or a CSI-RS for CSI acquisition) , supported report configuration (s) (e.g., CSI acquisition and / or performance monitoring for AI / ML functionality / models) based on the CSI-RS for PRB bundling in the time and / or the frequency-domain.
[0077] The network entity 104 (e.g., based on the received UE capabilities) transmits 518b control signaling configuring a CSI-RS resource or a CSI-RS resource set with a PRB bundling configuration in the time and / or frequency-domain and configuring a first report configuration based on the CSI-RS resource or CSI-RS resource set. The control signaling optionally configures a second report configuration that is linked with the first report configuration or an SRS associated with the CSI-RS resource or the CSI-RS resource set. The network entity 104 can configure the first report configuration for CSI acquisition or performance monitoring for AI / ML model / functionality (e.g., the first report configuration may be associated with an associated ID for an additional condition indication, a model ID for AI / ML model identification, and / or a dataset ID for training data set identification) . The network entity 104 can configure the second report configuration for CSI acquisition or inference configuration for an AI / ML functionality or model (e.g., the first report configuration may be associated with an associated ID for an additional condition indication, a model ID for AI / ML model identification, and / or a dataset ID for training data set identification) . In the first report configuration, the network entity 104 can configure a first CSI-RS resource or a first CSI-RS resource set with PRB bundling as a channel measurement resource and the network entity 104 can configure a second CSI-RS resource or a second CSI-RS resource set with PRB bundling as an interference measurement resource.
[0078] The network entity 104 can transmit the control signaling by RRC signaling (e.g., RRCReconfiguration) . The network entity 104 can provide some of the configurations (e.g., the first configuration, the second configuration, etc. ) or update some of the configurations by a MAC-CE (e.g., a MAC-CE activating a (semi-persistent) CSI report) or by DCI (e.g., different triggering states for a DCI triggering an (aperiodic) CSI report may correspond to different configurations.
[0079] The network entity 104 optionally receives 522b a second report corresponding to the second report configuration. The second report may include precoder information. Alternatively, the network entity 104 can receive an SRS associated with the CSI-RS resource. The network entity 104 can use the SRS for downlink CSI acquisition to determine a precoder for the CSI-RS.
[0080] The network entity 104 optionally transmits 526b control signaling (e.g., a MAC-CE or DCI) activating or triggering the configured first report configuration and / or the configured CSI-RS resources for channel measurement and / or the configured CSI-RS / CSI-IM for interference measurement. The control signaling optionally indicates the PRB bundling configuration for the CSI-RS.
[0081] The network entity 104 optionally determines 527b a PRG based on at least one of allocated RBs for the CSI-RS, RBs for a bandwidth part, a reference bandwidth, a bandwidth of the CSI-RS, a configured frequency-domain granularity for the report, or a frequency-domain granularity for a linked report.
[0082] The network entity 104 optionally determines 528b a start of the time-domain bundling window based on at least one of an update of at least one RRC parameter for the CSI-RS, bandwidth part switching, transmission of an SRS associated with the CSI-RS resource, transmission of a linked report, an active period of cell DTX operation, an active time of UE DRX operation, or second control signaling indicating a start of the time-domain bundling window.
[0083] The network entity 104 transmits 530b (e.g., based on the received precoder information in the second report) a CSI-RS on the configured CSI-RS based on the PRB bundling configuration for the time-domain and / or frequency-domain.
[0084] The network entity 104 receives 534b a first report based on the received CSI-RS and the first report configuration. In an example, the network entity 104 receives the first report by an RRC message (e.g., an RRC message for performance monitoring) , a MAC-CE (e.g., a MAC-CE for performance monitoring, ) UCI on a PUCCH (e.g., a short PUCCH (aPUCCH with less than 4 symbols) or a long PUCCH (aPUCCH with 4 or more symbols) , or a PUSCH.
[0085] Various options exist for frequency-domain PRB bundling. In some aspects, the network entity 104 configures frequency-domain PRB bundling via an explicit configuration. In some aspects, the UE 102 and / or the network entity 104 determine frequency-domain PRB bundling implicitly.
[0086] In some aspects pertaining to the explicit configuration, the network entity 104 configures at least one of the following for a CSI-RS resource or a CSI-RS resource set: a PRG size for one or multiple PRGs which may include “wideband” (e.g., a number of RBs per PRG) , a number of PRGs, which may include the value of 1 (e.g., wideband operation) , or PRB index (es) for each PRG.
[0087] The network entity 104 can further configure RBs or a bandwidth for the CSI-RS resource or the CSI-RS resource set (e.g., ) . In one example, indicates a total number of configured RBs for the CSI-RS. In another example, indicates a number of RBs calculated based on a first RB and a last RB allocated for the CSI-RS resource or the CSI-RS resource set. In some aspects, the network entity 104 configures the CSI-RS resource or the CSI-RS resource set in consecutive PRBs. In some aspects, the network entity 104 provides the same PRG configuration for CSI-RS resources in a CSI-RS resource set. The network entity 104 can further configure the CSI-RS resources in the CSI-RS resource set from different ports or based on different quasi-colocation (QCL) configurations.
[0088] The network entity 104 can provide the aforementioned configuration in a configuration of a CSI-RS resource or a CSI-RS resource set, a CSI report configuration, a downlink bandwidth part configuration, or a serving cell configuration.
[0089] In one example, the network entity 104 provides a configuration for CSI-RS resource (s) for CSI acquisition (e.g., CSI-RS resource (s) in a CSI-RS resource set) without repetition and trs-Info configured. For other types of CSI-RS resource (s) , the UE 102 can determine PRB bundling based on a wideband manner.
[0090] In another example, the network entity 104 provides a configuration for a CSI report configuration based on a certain report quantity (e.g., a CRI / RI / CQI / LI report) . For CSI-RS resource (s) associated with other CSI report configurations, the UE 102 can determine the PRB bundling for the CSI-RS resource (s) based on a wideband manner.
[0091] In another example, the network entity 104 provides a configuration for performance monitoring for an AI / ML functionality or model (e.g., CSI prediction and / or CSI compression) . For CSI-RS resource (s) associated with other configurations, the UE 102 can determine the PRB bundling for the CSI-RS resource (s) based on a wideband manner.
[0092] In another example, when none of the parameters above is configured (e.g., when the PRG size, the number of PRGs, and the PRB index (es) are not configured) , the network entity 104 and the UE 102 determine CSI-RS resource (s) based on a wideband manner.
[0093] In some aspects, the network entity 104 configures or indicates at least one of the parameters above (e.g., the PRG size, the number of PRGs, and the PRB index (es) ) by RRC signaling (e.g., an RRC reconfiguration) , a MAC-CE, or a DCI. In one example, the MAC-CE activates a semi-persistent report or a separate MAC-CE. In another example, the DCI triggers the report, where different PRG configurations may be associated with different triggering states of the DCI. Alternatively, the DCI may be a separate DCI.
[0094] FIG. 6 is a diagram 600 illustrating an example of determining a PRG based on allocated RBs for a CSI-RS according to an embodiment. In some aspects pertaining to the explicit configuration, the UE 102 and / or the network entity 104 determine the PRG based on allocated RBs for a CSI-RS. In some aspects, the network entity 104 and the UE 102 determine the RBs for each PRG based on a configured number of RBs and the PRG configuration for the CSI-RS resource. Thus, the PRG configuration for the CSI-RS may be in UE-specific manner.
[0095] The diagram 600 depicts allocated RBs 636 for a CSI-RS. The diagram 600 further depicts PRG 1 638a and PRG 2 638b. In the example depicted in the diagram 600, the PRG size (e.g., the PRG size for PRG 1 638a and PRG 2 638b) is four RBs.
[0096] In one example, the network entity 104 configures the PRG size (e.g., a number of RBs per PRG ) , and the network entity 104 and the UE 102 determine each PRG as follows: if mod the PRG size for one PRG (e.g., the first PRG or the last PRG) is mod and the PRG size for other PRG (s) is otherwise the PRG size for all the PRG (s) is Each PRG may include consecutive RBs from the RBs. Alternatively, the network entity 104 configuration ensures that mod Then the PRG size for each PRG is
[0097] In another example, the network entity 104 configures the number of PRGs (NPRG) , and the network entity 104 and the UE 102 determine each PRG as follows: if mod NPRG>0, the PRG size for one PRG (e.g., the first PRG or the last PRG) is mod NPRG or or and the PRG size for other PRG (s) is or otherwise, the PRG size for all the PRG (s) is Each PRG may include consecutive RBs from the RBs. Alternatively, the configuration ensures that mod NPRG=0. Then the PRG size for each PRG is
[0098] FIG. 7 is a diagram 700 illustrating an example of determining a PRG based on RBs for a BWP according to an embodiment. In some aspects pertaining to the explicit configuration, the UE 102 and / or the network entity 104 determine the PRG based on RBs for a bandwidth part. In some aspects, the network entity 104 and the UE 102 determine RBs for each PRG based on configured RBs for a downlink BWP for a CSI-RS resource. Thus, the PRG configuration for the CSI-RS may be common for UEs in the same BWP. The network entity 104 can configure the RBs for the BWP, and above may indicate the number of RBs for the downlink BWP.
[0099] The diagram 700 depicts allocated RBs 736 for a CSI-RS and other RBs 740. The diagram 700 further depicts PRG 1 738a and PRG 2 738b. The diagram 700 additionally depicts an RB for a BWP 742. In an example, the network entity 104 and / or the UE 102 determine RB (s) for PRG 1 738a and PRG 2 738b based on the RBs for the BWP 742. In the example depicted in the diagram 700, the PRG size (e.g., the PRG size for PRG 1 738a and PRG 2 738b) is four RBs.
[0100] FIG. 8 is a diagram 800 illustrating an example of determining a PRG based on a reference bandwidth according to an embodiment. In some aspects pertaining to the explicit configuration, the UE 102 and / or the network entity 104 determine the PRG based on a reference bandwidth. In some aspects, the network entity 104 and the UE 102 determine RBs for each PRG based on a reference bandwidth. Thus, the PRG configuration for the CSI-RS may be common for all UEs. The above may indicate the number of RBs for the reference bandwidth.
[0101] The reference bandwidth may be predefined, the network entity 104 can configure the reference bandwidth, or the UE 102 can report the reference bandwidth. In one example, the network entity 104 and the UE 102 determine the reference bandwidth based on a starting RB offset for a DL BWP for a CSI-RS compared to a common RB 0, and the bandwidth of the DL BWP.
[0102] The diagram 800 depicts allocated RBs 836 for a CSI-RS and other RBs 840. The diagram 800 further depicts PRG 1 838a and PRG 2 838b. The diagram 800 additionally depicts an RB for a BWP 842, a reference bandwidth 844, a starting RB offset 846, and common RB 0 848. In an example, the network entity 104 and the UE 102 determine the reference bandwidth 844 based on the starting RB offset 846 for the BWP 842 compared to common RB 0 848 and the BWP 842. In the example depicted in the diagram 800, the PRG size (e.g., the PRG size for PRG 1 838a and PRG 2 838b) is four RBs.
[0103] FIG. 9 is a diagram 900 illustrating an example of determining a PRG based on a configured subband size according to an embodiment. In some aspects, the UE 102 and / or the network entity 104 determine frequency-domain PRB bundling implicitly. In some aspects, the UE 102 determines RBs for each PRG for a CSI-RS resource or a CSI-RS resource set based on at least one of the following: a bandwidth of a CSI-RS, a configured frequency-domain granularity for a report, or a frequency-domain granularity for a linked report. The network entity 104 can further configure whether to enable or disable PRG size determination for a CSI-RS resource or a CSI-RS resource set or a report configuration. If PRG size determination is enabled, the network entity 104 and the UE 102 may perform PRG determination for CSI-RS resource (s) based on the configuration for the CSI-RS resource (s) and / or report configuration; otherwise, the network entity 104 and the UE 102 may determine the PRG size for the CSI-RS resource (s) as ‘wideband’ (e.g., a common precoder is applied for the whole bandwidth of the CSI-RS resource (s) ) .
[0104] In some aspects, if the bandwidth of the CSI-RS is smaller than a threshold, the UE 102 determines that a PRG for a CSI-RS based on a wideband manner; otherwise, the UE 102 determines the PRG configuration based on configured explicit parameters (e.g., a PRG size for one or multiple PRGs which may include “wideband” (e.g., a number of RBs per PRG) , a number of PRGs, which may include the value of 1 (e.g., wideband operation) , or PRB index (es) for each PRG) or other configurations (e.g., a bandwidth of a CSI-RS, a configured frequency-domain granularity for a report, and a frequency-domain granularity for a linked report) . The threshold may be predefined (e.g., four RBs) , the network entity 104 can configure the threshold, or the UE 102 can report the threshold.
[0105] In some other aspects, the UE 102 determines a PRG for a CSI-RS based on a configured frequency-domain granularity (e.g., whether the report is based on a wideband manner or a subband manner, a subband size, and / or a number of subbands) . In one example, the UE 102 determines the PRG is based on X configured subbands, where X is predefined or where the network entity 104 configures X. Alternatively, the UE 102 can determine that each configured subband includes Y PRGs, where Y may be predefined or where the network entity 104 can configure Y, or where the UE 102 reports Y, or where the UE 102 and / or the network entity 104 determine Y based on a subband size.
[0106] The diagram 900 depicts allocated RBs 936 for a CSI-RS. The diagram 900 further depicts PRG 1 938a and PRG 2 938b. The diagram 900 additionally depicts a configured subband size 950. In the example depicted in the diagram 900, the configured subband size 950 is two RBs. In an example, the network entity 104 and / or the UE 102 determine a PRG (e.g., PRG 1 938a, PRG 2 938b, etc. ) based on the configured subband size 950.
[0107] FIG. 10 is a diagram 1000 illustrating an example of determining a PRG based on a subband size for a linked report according to an embodiment. In some aspects, the network entity 104 configures a report configuration linked with another report configuration, and the network entity 104 and the UE 102 determine a PRG configuration for a CSI-RS resource or a CSI-RS resource set based on a subband size for the report configuration. In one example, the network entity 104 configures a linked report configuration including at least a precoder information report (e.g., PMI or an AI / ML based CSI prediction and / or compression) . The network entity 104 can trigger the UE 102 to provide the report for both report configurations in a joint report manner or a separate report manner.
[0108] In one example, the UE 102 determines the PRG is based on X subbands for the linked report, where X is predefined or where the network entity 104 configures X. Alternatively, the UE 102 can determine each subband for the linked report includes Y PRGs, where Y may be predefined, the network entity 104 can configure Y, the UE 102 can report Y, or where the UE 102 and / or the network entity 104 determine Y based on a subband size.
[0109] The diagram 1000 depicts allocated RBs 1036 for a CSI-RS and other RBs 1040. The diagram 1000 further depicts PRG 1 1038a and PRG 2 1038b. The diagram 1000 additionally depicts a subband size 1052 for a linked report and a bandwidth 1054 for a channel measurement resource for a linked report. In an example, the subband size 1052 for the linked report is two RBs. In an example, the network entity 104 and / or the UE 102 determine a PRG (e.g., PRG 1 1038a, PRG 2 1038b, etc. ) based on the subband size 1052 for the linked report.
[0110] In some aspects, the network entity 104 can configure the UE 102 with an explicit configuration for time-domain PRB handling. In some aspects, the network entity 104 and / or the UE 102 determine time-domain PRB handling implicitly.
[0111] FIG. 11 is a diagram 1100 illustrating an example of a fixed-length time-domain bundling window configuration according to an embodiment. In some aspects pertaining to the explicit configuration, fixed length time-domain bundling is utilized. In such aspects, the network entity 104 configures at least one of the following for a timing-domain bundling window for a CSI-RS resource or a CSI-RS resource set: a periodicity for the time-domain bundling window, a starting location for each time-domain bundling window (e.g., a slot / subframe / frame offset for the time-domain bundling window) , or a duration for each time-domain bundling window (e.g., a number of consecutive (nominal or actual) transmission occasions of a CSI-RS resource per time-domain bundling window or a number of slots / subframes / frames / milliseconds per time-domain bundling window) .
[0112] The network entity 104 can transmit the different transmission occasions of a CSI-RS resource within a time-domain bundling window based on the same precoder for the same PRG. Alternatively, the network entity 104 can transmit different CSI-RS resources within a time-domain bundling window based on the same precoder for the same PRG. The UE 102 can determine transmission occasions for a CSI-RS resource within a time-domain bundling window based on the same precoder for the same PRG. Alternatively, the UE 102 can determine different CSI-RS resources within a time-domain bundling window based on the same precoder for the same PRG. The network entity 104 can further configure whether the time-domain bundling is per-resource or cross resources. The network entity 104 can further configure the CSI-RS resources to apply a time-domain bundle for cross-resource bundling. In some aspects, the UE 102 further determines CSI-RS resource (s) within a time window based on a continuous phase. The network entity 104 can transmit the CSI-RS resource (s) within a time-domain bundling window based on the continuous phase.
[0113] In some aspects, the network entity 104 provide the configuration for the time-domain bundling window by RRC signaling, a MAC-CE, or DCI. In one example, the MAC-CE activates a semi-persistent CSI-RS report or a separate MAC-CE. In another example, the DCI triggers the CSI-RS report, where different PRG configurations may be associated with different triggering states of the DCI. Alternatively, the DCI may be a separate DCI.
[0114] The diagram 1100 depicts a CSI-RS based on a first precoder 1108a and a CSI-RS based on a second precoder 1108b. The diagram 1100 also depicts a time-domain bundling window 1156a (corresponding to transmission occasions associated with the first precoder 1108a) and a time-domain bundling window 1156b (corresponding to transmission occasions associated with the second precoder 1108b) . In an example, the time-domain bundling window 1156a and the time-domain bundling window 1156b have fixed lengths. In an example, the network entity 104 and / or the UE 102 determine the time-domain bundling window 1156a and the time-domain bundling window 1156b based on a fixed-length time-domain bundling window configuration.
[0115] FIG. 12 is a diagram 1200 illustrating an example of a flexible length time-domain bundling window based on control signaling according to an embodiment. In some aspects pertaining to the explicit configuration, flexible length time-domain bundling is utilized. In such aspects, the network entity 104 configures or indicates whether the precoder for a transmission occasion of a CSI-RS is changed or not changed or is the same as a previous transmission occasion or not the same as the previous transmission occasion. In one example, the network entity 104 indicates whether the transmission occasion of a CSI-RS resource or CSI-RS resource set is based on a different time-domain bundling window as previous transmission occasions of the CSI-RS resource or the CSI-RS resource set.
[0116] In some other aspects, the network entity 104 configures multiple time-domain bundling windows with different durations. The network entity 104 can further activate one or multiple time-domain bundling windows.
[0117] The network entity 104 can provide the configuration or indication by an RRC message, a MAC-CE, or DCI. In one example, the MAC-CE activates a semi-persistent CSI-RS or a report or a separate MAC-CE. In another example, the DCI triggers the CSI-RS or a report, where different PRG configurations may be associated with different triggering states of the DCI. Alternatively, the DCI may be a separate DCI.
[0118] The diagram 1200 depicts a CSI-RS based on a first precoder 1208a, a CSI-RS based on a second precoder 1208b, and control signaling 1258 indicating that a new time-domain bundling window begins. The diagram 1200 also depicts a time-domain bundling window 1256a and a time-domain bundling window 1256b. As depicted in the diagram 1200, lengths of the time-domain bundling window 1256a and the time-domain bundling window 1256b vary (i.e., the lengths are flexible) . In an example, the UE 102 and / or the network entity 104 determine the time-domain bundling window 1256b based on the reception or transmission, respectively, of the control signaling 1258 indicating that a new time-domain bundling window begins.
[0119] FIG. 13 is a diagram 1300 illustrating an example of a flexible length time-domain bundling window based on an event according to an embodiment. In some aspects, the network entity 104 and / or the UE 102 determine time-domain PRB handling implicitly. In such aspects, the network entity 104 and the UE 102 determine a new time-domain bundling window for a CSI-RS resource or a CSI-RS resource set starts if at least one of the following occurs: an update of at least one RRC parameter for the CSI-RS resource or the CSI-RS resource set (e.g., a reconfiguration of the CSI-RS or the report configuration or a QCL or transmission configuration indication (TCI) state update) , BWP switching, transmitting an SRS resource or an SRS resource set associated with the CSI-RS resource or the CSI-RS resource set, or transmitting a report for the second report configuration linked with the first report configuration based on the CSI-RS resource or the CSI-RS resource.
[0120] In some aspects, the network entity 104 configures whether dynamic determination of time-domain bundling for a CSI-RS resource or a CSI-RS resource set is enabled or disabled. If enabled, the UE 102 can determine the time-domain bundling window based on the events above; otherwise, the UE 102 can determine transmission occasions for the CSI-RS resource or the CSI-RS resource set as always bundled or always not bundled, which may be predefined, configured by the network entity 104, or reported by the UE 102.
[0121] In one example, the network entity 104 configures the CSI-RS resource or the CSI-RS resource set associated with an SRS resource or an SRS resource set. The SRS resource may be configured for antenna switching (e.g., in an SRS resource set with usage configured as ‘antennaSwitching’ ) . Then, based on reception of the SRS, the network entity 104 can update a precoder for the CSI-RS. Thus, after K symbols / slots / milliseconds after transmitting a last symbol for the SRS resource or the SRS resource set, the UE 102 can determine that a new time-domain bundling window starts for a corresponding CSI-RS resource or a corresponding CSI-RS resource set. The value of K may be predefined (e.g., K=0) , or configured by the network entity 104, or reported by the UE 102.
[0122] In another example, the network entity 104 configures the CSI-RS resource or the CSI-RS resource set for a first report configuration linked with a second report configuration. The network entity 104 can trigger the report for both report configurations jointly or separately. After K symbols / slots / milliseconds after transmitting a last symbol for the report for the second report configuration, the UE 102 can determine that a new time-domain bundling window starts for a corresponding CSI-RS resource or for a corresponding CSI-RS resource set. The value of K may be predefined (e.g., K=0) , configured by the network entity 104, or reported by the UE 102.
[0123] The diagram 1300 depicts a CSI-RS based on a first precoder 1308a, a CSI-RS based on a second precoder 1308b, and an event 1360 to determine that a new time-domain bundling window begins. The diagram 1300 also depicts a time-domain bundling window 1356a and a time-domain bundling window 1356b. As depicted in the diagram 1300, lengths of the time-domain bundling window 1356a and the time-domain bundling window 1356b vary (i.e., the lengths are flexible) . In an example, the UE 102 and / or the network entity 104 determine the time-domain bundling window 1356b based on detecting / identifying / determining the event 1360. In an example, the event 1360 may be or include an update of at least one RRC parameter for the CSI-RS resource or the CSI-RS resource set (e.g., a reconfiguration of the CSI- RS or the report configuration or a QCL or TCI state update) , BWP switching, transmitting an SRS resource or an SRS resource set associated with the CSI-RS resource or the CSI-RS resource set, or transmitting a report for the second report configuration linked with the first report configuration based on the CSI-RS resource or the CSI-RS resource.
[0124] FIG. 14A is a diagram 1400A illustrating an example of a time-domain bundling window when cell discontinuous transmission (DTX) or UE discontinuous reception (DRX) is not configured or not activated according to an embodiment. In some aspects, the network entity 104 and the UE 102 determine CSI-RS resources in different active periods or active times of cell DTX or UE DRX based on different time-domain bundling windows. In some other aspects, the network entity 104 and the UE 102 determine the CSI-RS resources in different active periods or active times of cell DTX or UE DRX based on the same time-domain bundling window. The network entity 104 can configure whether the CSI-RS resources in different active periods or active times of cell DTX or UE DRX are based on different time-domain bundling windows or not.
[0125] The diagram 1400A depicts a CSI-RS based on a first precoder 1108a and a CSI-RS based on a second precoder 1108b. The diagram 1400A also depicts a time-domain bundling window 1156a and a time-domain bundling window 1156b. In an example, the network entity 104 and / or the UE 102 determine the time-domain bundling window 1156a and the time-domain bundling window 1156b based on cell DTX or UE DRX not being configured / activated.
[0126] FIG. 14B is a diagram 1400B illustrating an example of a time-domain bundling window when cell DTX or UE DRX is configured or activated according to an embodiment. The diagram 1400B depicts a time-domain bundling window 1456a and a time-domain bundling window 1456b. The diagram 1400B further depicts an active time / period 1462a, an inactive time / period 1464, and an active time / period 1462b. In an example, the network entity 104 and / or the UE 102 determine the time-domain bundling window 1456a and the time-domain bundling window 1456b based on cell DTX or UE DRX being configured / activated.
[0127] In some aspects, the network entity 104 configures the UE 102 to report at least one of the following based on a CSI-RS with PRB bundling in a frequency / time-domain: a wideband RI or a subband RI, a wideband CRI or a subband CRI, a wideband CQI or a subband CQI, a wideband PMI or a subband PMI, a wideband LI or a subband LI, a wideband PO or a subband PO, a wideband DO or a subband DO, a wideband FO or a subband FO, wideband intermediate results for performance monitoring for one or multiple AI / ML functionalities or models (e.g., hypothetical BLER, SINR, RSRP, and / or CQI) or subband intermediate results for performance monitoring for one or multiple AI / ML functionalities or models (e.g., hypothetical BLER, SINR, RSRP, and / or CQI) , or wideband results for performance monitoring of events for one or multiple AI / ML functionalities or models (e.g., whether the results meet criteria for performance failure or not, whether the results meet criteria for valid performance or not) or subband results for performance monitoring of events for one or multiple AI / ML functionalities or models (e.g., whether the results meet criteria for performance failure or not, whether the results meet criteria for valid performance or not) .
[0128] The UE 102 can determine that results meet criteria for performance failure if the UE 102 detects N times of a failure event within a time window (e.g., the intermediate result above or below a first threshold, which may be predefined or configured by the network entity 104) . The value of N and / or the time window may be predefined, the network entity 104 can configure the value of N and / or the time window, or the UE 102 can report the value of N and / or the time window. The UE 102 can determine the results meets the criteria for valid performance if the UE 102 detects M times of a valid performance event within a time window (e.g., the intermediate result is above or below a second threshold, which may be predefined or configured by the network entity 104) . The value of M and / or the time window may be predefined, the network entity 104 can configure the value of M and / or the time window, or the UE 102 can report the value of M and / or the time window.
[0129] FIG. 15 illustrates a flowchart 1500 of a method of wireless communication at a UE. With reference to FIGs. 1-4, FIG. 5A, FIG. 5B, FIGs. 7-13, FIG. 14A, and FIG. 14B, the method may be performed by the UE 102.
[0130] The UE 102 optionally transmits 1514, to a network entity, a UE capability indicating support for at least one of: PRB bundling for the CSI-RS in a time-domain; PRB bundling for the CSI-RS in a frequency-domain; PRB bundling for the CSI-RS in a time and frequency-domain; a minimum or a maximum bundling size in the frequency-domain; a minimum or a maximum bundling size in the time-domain; types of CSI-RSs for PRB bundling; or report configurations based on a CSI-RS with PRB bundling. For example, FIG. 4 shows that the UE 102 optionally transmits 414, to a network entity 104, a UE capability indicating support for at least one of: PRB bundling for the CSI-RS in a time-domain; PRB bundling for the CSI-RS in a frequency-domain; PRB bundling for the CSI-RS in a time and frequency-domain; a minimum or a maximum bundling size in the frequency-domain; a minimum or a maximum bundling size in the time-domain; types of CSI-RSs for PRB bundling; or report configurations based on a CSI-RS with PRB bundling
[0131] The UE 102 receives 1518, from the network entity, control signaling configuring: a CSI-RS resource with a PRB bundling configuration and a report configuration based on the CSI-RS resource. For example, FIG. 4 shows that the UE 102 receives 418, from the network entity 104, control signaling configuring: a CSI-RS resource with a PRB bundling configuration and a report configuration based on the CSI-RS resource
[0132] The UE 102 optionally transmits 1522, to the network entity, a second report based on the second report configuration or an SRS associated with the CSI-RS resource. For example, FIG. 4 shows that the UE 102 optionally transmits 422, to the network entity 104, a second report based on the second report configuration or an SRS associated with the CSI-RS resource.
[0133] The UE 102 optionally receives 1526, from the network entity, second control signaling triggering the report and the CSI-RS resource, the second control signaling indicating a bundling size for the CSI-RS. For example, FIG. 4 shows that the UE 102 optionally receives 426, from the network entity 104, second control signaling triggering the report and the CSI-RS resource, the second control signaling indicating a bundling size for the CSI-RS.
[0134] The UE 102 optionally determines 1527a a PRG based on at least one of: allocated RBs for the CSI-RS; RBs for a bandwidth part; a reference bandwidth; a bandwidth of the CSI-RS; a configured frequency-domain granularity for the report; or a frequency-domain granularity for a linked report. For example, FIG. 5A shows that the UE 102 optionally determines 527a a PRG based on at least one of: allocated RBs for the CSI-RS; RBs for a bandwidth part; a reference bandwidth; a bandwidth of the CSI-RS; a configured frequency-domain granularity for the report; or a frequency-domain granularity for a linked report.
[0135] The UE 102 optionally determines 1528a a start of a time-domain bundling window based on at least one of: an update of at least one RRC parameter for the CSI-RS;bandwidth part switching; transmission of an SRS associated with the CSI-RS resource; transmission of a linked report; an active period of cell DTX operation; an active time of UE DRX operation; or second control signaling indicating the start of the time-domain bundling window. For example, FIG. 5A shows that the UE 102 optionally determines 528a a start of a time-domain bundling window based on at least one of: an update of at least one RRC parameter for the CSI-RS; bandwidth part switching; transmission of an SRS associated with the CSI-RS resource; transmission of a linked report; an active period of cell DTX operation; an active time of UE DRX operation; or second control signaling indicating the start of the time-domain bundling window.
[0136] The UE 102 receives 1530, from the network entity, a CSI-RS corresponding to the CSI-RS resource. For example, FIG. 4 shows that the UE 102 receives 430, from the network entity 104, a CSI-RS corresponding to the CSI-RS resource.
[0137] The UE 102 transmits 1534, to the network entity, a report based on the report configuration and the CSI-RS. For example, FIG. 4 shows that the UE 102 transmits 434, to the network entity 104, a report based on the report configuration and the CSI-RS.
[0138] FIG. 16 is a flowchart 1600 of a method of wireless communication at a network entity. With reference to FIGs. 1-4, FIG. 5A, FIG. 5B, FIGs. 7-13, FIG. 14A, and FIG. 14B, the method may be performed by one or more network entities 104, which may correspond to a base station or a unit of the base station, such as the RU 106, the DU 108, and / or the CU 110.
[0139] The network entity 104 optionally receives 1614, from a UE, a UE capability indicating support for at least one of: PRB bundling for the CSI-RS in a time-domain; PRB bundling for the CSI-RS in a frequency-domain; PRB bundling for the CSI-RS in a time and frequency-domain; a minimum or a maximum bundling size in the frequency-domain; a minimum or a maximum bundling size in the time-domain; types of CSI-RSs for PRB bundling; or report configurations based on a CSI-RS with PRB bundling. For example, FIG. 4 shows that the network entity 104 optionally receives 414, from a UE 102, a UE capability indicating support for at least one of: PRB bundling for the CSI-RS in a time-domain; PRB bundling for the CSI-RS in a frequency-domain; PRB bundling for the CSI-RS in a time and frequency-domain; a minimum or a maximum bundling size in the frequency-domain; a minimum or a maximum bundling size in the time-domain; types of CSI-RSs for PRB bundling; or report configurations based on a CSI-RS with PRB bundling.
[0140] The network entity 104 transmits 1618, to the UE, control signaling configuring: a CSI-RS resource with a PRB bundling configuration and a report configuration based on the CSI-RS resource. For example, FIG. 4 shows that the network entity 104 transmits 418, to the UE 102, control signaling configuring: a CSI-RS resource with a PRB bundling configuration and a report configuration based on the CSI-RS resource.
[0141] The network entity 104 optionally receives 1622, from the UE, a second report based on the second report configuration or an SRS associated with the CSI-RS resource. For example, FIG. 4 shows that the network entity 104 optionally receives 422, from the UE 102, a second report based on the second report configuration or an SRS associated with the CSI-RS resource.
[0142] The network entity 104 optionally transmits 1626, to the UE, second control signaling triggering the report and the CSI-RS resource, the second control signaling indicating a bundling size for the CSI-RS. For example, FIG. 4 shows that the network entity 104 optionally transmits 426, to the UE 102, second control signaling triggering the report and the CSI-RS resource, the second control signaling indicating a bundling size for the CSI-RS.
[0143] The network entity 104 optionally determines 1627b a PRG based on at least one of: allocated RBs for the CSI-RS; RBs for a bandwidth part; a reference bandwidth; a bandwidth of the CSI-RS; a configured frequency-domain granularity for the report; or a frequency-domain granularity for a linked report. For example, FIG. 5B shows that the network entity 104 optionally determines 527b a PRG based on at least one of: allocated RBs for the CSI-RS; RBs for a bandwidth part; a reference bandwidth; a bandwidth of the CSI-RS; a configured frequency-domain granularity for the report; or a frequency-domain granularity for a linked report.
[0144] The network entity 104 optionally determines 1628b a start of a time-domain bundling window based on at least one of: an update of at least one RRC parameter for the CSI-RS; bandwidth part switching; transmission of an SRS associated with the CSI-RS resource; transmission of a linked report; an active period of cell DTX operation; an active time of UE DRX operation; or second control signaling indicating the start of the time-domain bundling window. For example, FIG. 5B shows that the network entity 104 optionally determines 528b a start of a time-domain bundling window based on at least one of: an update of at least one RRC parameter for the CSI-RS;bandwidth part switching; transmission of an SRS associated with the CSI-RS resource; transmission of a linked report; an active period of cell DTX operation; an active time of UE DRX operation; or second control signaling indicating the start of the time-domain bundling window.
[0145] The network entity 104 transmits 1630, to the UE, a CSI-RS corresponding to the CSI-RS resource. For example, FIG. 4 shows that the network entity 104 transmits 430, to the UE 102, a CSI-RS corresponding to the CSI-RS resource.
[0146] The network entity 104 receives 1634, from the UE, a report based on the report configuration and the CSI-RS. For example, FIG. 4 shows that the network entity 104 receives 1634, from the UE 102, a report based on the report configuration and the CSI-RS.
[0147] A UE apparatus 1702, as described in FIG. 17, may perform the method of flowchart 1500. The one or more network entities 104, as described in FIG. 18, may perform the method of flowchart 1600.
[0148] FIG. 17 is a diagram 1700 illustrating an example of a hardware implementation for a UE apparatus 1702. The UE apparatus 1702 may be the UE 102, a component of the UE 102, or may implement UE functionality. The UE apparatus 1702 may include an application processor 1706, which may have on-chip memory 1706’ . In examples, the application processor 1706 may be coupled to a secure digital (SD) card 1708 and / or a display 1710. The application processor 1706 may also be coupled to a sensor (s) module 1712, a power supply 1714, an additional module of memory 1716, a camera 1718, and / or other related components.
[0149] The UE apparatus 1702 may further include a wireless baseband processor 1726, which may be referred to as a modem. The wireless baseband processor 1726 may have on-chip memory 1726'. Along with, and similar to, the application processor 1706, the wireless baseband processor 1726 may also be coupled to the sensor (s) module 1712, the power supply 1714, the additional module of memory 1716, the camera 1718, and / or other related components. The wireless baseband processor 1726 may be additionally coupled to one or more subscriber identity module (SIM) card (s) 1720 and / or one or more transceivers 1730 (e.g., wireless RF transceivers) .
[0150] Within the one or more transceivers 1730, the UE apparatus 1702 may include a Bluetooth module 1732, a WLAN module 1734, an SPS module 1736 (e.g., GNSS module) , and / or a cellular module 1738. The Bluetooth module 1732, the WLAN module 1734, the SPS module 1736, and the cellular module 1738 may each include an on-chip transceiver (TRX) , or in some cases, just a transmitter (TX) or just a receiver (RX) . The Bluetooth module 1732, the WLAN module 1734, the SPS module 1736, and the cellular module 1738 may each include dedicated antennas and / or utilize antennas 1740 for communication with one or more other nodes. For example, the UE apparatus 1702 can communicate through the transceiver (s) 1730 via the antennas 1740 with another UE (e.g., sidelink communication) and / or with a network entity 104 (e.g., uplink / downlink communication) , where the network entity 104 may correspond to a base station or a unit of the base station, such as the RU 106, the DU 108, or the CU 110.
[0151] The wireless baseband processor 1726 and the application processor 1706 may each include a computer-readable medium / memory 1726', 1706', respectively. The additional module of memory 1716 may also be considered a computer-readable medium / memory. Each computer-readable medium / memory 1726', 1706', 1716 may be non-transitory. The wireless baseband processor 1726 and the application processor 1706 may each be responsible for general processing, including execution of software stored on the computer-readable medium / memory 1726', 1706', 1716. The software, when executed by the wireless baseband processor 1726 / application processor 1706, causes the wireless baseband processor 1726 / application processor 1706 to perform the various functions described herein. The computer-readable medium / memory may also be used for storing data that is manipulated by the wireless baseband processor 1726 / application processor 1706 when executing the software. The wireless baseband processor 1726 / application processor 1706 may be a component of the UE 102. The UE apparatus 1702 may be a processor chip (e.g., modem and / or application) and include just the wireless baseband processor 1726 and / or the application processor 1706. In other examples, the UE apparatus 1702 may be the entire UE 102 and include the additional modules of the apparatus 1702.
[0152] As discussed in FIG. 1 and implemented with respect to FIG. 15, the PRB bundling component 140 is configured to receive, from a network entity, control signaling configuring: a channel state information reference signal (CSI-RS) resource with a physical resource block (PRB) bundling configuration and a report configuration based on the CSI-RS resource. The PRB bundling component 140 is configured to receive, from the network entity, a CSI-RS corresponding to the CSI-RS resource. The PRB bundling component 140 is configured to transmit, to the network entity, a report based on the report configuration and the CSI-RS.
[0153] The PRB bundling component 140 may be within the application processor 1706 (e.g., at 140a) , the wireless baseband processor 1726 (e.g., at 140b) , or both the application processor 1706 and the wireless baseband processor 1726. The PRB bundling component 140a-140b may be one or more hardware components specifically configured to carry out the stated processes / algorithm, implemented by one or more processors configured to perform the stated processes / algorithm, stored within a computer-readable medium for implementation by the one or more processors, or a combination thereof.
[0154] FIG. 18 is a diagram 1800 illustrating an example of a hardware implementation for one or more network entities 104. The one or more network entities 104 may be a base station, a component of a base station, or may implement base station functionality. The one or more network entities 104 may include, or may correspond to, at least one of the RU 106, the DU, 108, or the CU 110. The CU 110 may include a CU processor 1846, which may have on-chip memory 1846'. In some aspects, the CU 110 may further include an additional module of memory 1856 and / or a communications interface 1848, both of which may be coupled to the CU processor 1846. The CU 110 can communicate with the DU 108 through a midhaul link 162, such as an F1 interface between the communications interface 1848 of the CU 110 and a communications interface 1828 of the DU 108.
[0155] The DU 108 may include a DU processor 1826, which may have on-chip memory 1826'. In some aspects, the DU 108 may further include an additional module of memory 1836 and / or the communications interface 1828, both of which may be coupled to the DU processor 1826. The DU 108 can communicate with the RU 106 through a fronthaul link 160 between the communications interface 1828 of the DU 108 and a communications interface 1808 of the RU 106.
[0156] The RU 106 may include an RU processor 1806, which may have on-chip memory 1806'. In some aspects, the RU 106 may further include an additional module of memory 1816, the communications interface 1808, and one or more transceivers 1830, all of which may be coupled to the RU processor 1806. The RU 106 may further include antennas 1840, which may be coupled to the one or more transceivers 1830, such that the RU 106 can communicate through the one or more transceivers 1830 via the antennas 1840 with the UE 102.
[0157] The on-chip memory 1806', 1826', 1846'a nd the additional modules of memory 1816, 1836, 1856 may each be considered a computer-readable medium / memory. Each computer-readable medium / memory may be non-transitory. Each of the processors 1806, 1826, 1846 is responsible for general processing, including execution of software stored on the computer-readable medium / memory. The software, when executed by the corresponding processor (s) 1806, 1826, 1846 causes the processor (s) 1806, 1826, 1846 to perform the various functions described herein. The computer-readable medium / memory may also be used for storing data that is manipulated by the processor (s) 1806, 1826, 1846 when executing the software. In examples, the PRB bundling configuration component 150 may sit at any of the one or more network entities 104, such as at the CU 110; both the CU 110 and the DU 108; each of the CU 110, the DU 108, and the RU 106; the DU 108; both the DU 108 and the RU 106; or the RU 106.
[0158] As discussed in FIG. 1 and implemented with respect to FIG. 16, the PRB bundling configuration component 150 is configured to transmit, to a UE, control signaling configuring: a channel state information reference signal (CSI-RS) resource with a physical resource block (PRB) bundling configuration and a report configuration based on the CSI-RS resource. The PRB bundling configuration component 150 is configured to transmit, to the UE, a CSI-RS corresponding to the CSI-RS resource. The PRB bundling configuration component 150 is configured to receive, from the UE, a report based on the report configuration and the CSI-RS.
[0159] The PRB bundling configuration component 150 may be within one or more processors of the one or more network entities 104, such as the RU processor 1806 (e.g., at 150a) , the DU processor 1826 (e.g., at 150b) , and / or the CU processor 1846 (e.g., at 150c) . The PRB bundling configuration component 150a-150c may be one or more hardware components specifically configured to carry out the stated processes / algorithm, implemented by one or more processors 1806, 1826, 1846 configured to perform the stated processes / algorithm, stored within a computer-readable medium for implementation by the one or more processors 1806, 1826, 1846, or a combination thereof
[0160] The specific order or hierarchy of blocks in the processes and flowcharts disclosed herein is an illustration of example approaches. Hence, the specific order or hierarchy of blocks in the processes and flowcharts may be rearranged. Some blocks may also be combined or deleted. Dashed lines may indicate optional elements of the diagrams. The accompanying method claims present elements of the various blocks in an example order, and are not limited to the specific order or hierarchy presented in the claims, processes, and flowcharts.
[0161] The detailed description set forth herein describes various configurations in connection with the drawings and does not represent the only configurations in which the concepts described herein may be practiced. The detailed description includes specific details for the purpose of providing a thorough explanation of various concepts. However, these concepts may be practiced without these specific details. In some instances, well known structures and components are shown in block diagram form in order to avoid obscuring such concepts.
[0162] Aspects of wireless communication systems, such as telecommunication systems, are presented with reference to various apparatuses and methods. These apparatuses and methods are described in the following detailed description and are illustrated in the accompanying drawings by various blocks, components, circuits, processes, call flows, systems, algorithms, etc. (collectively referred to as “elements” ) . These elements may be implemented using electronic hardware, computer software, or combinations thereof. Whether such elements are implemented as hardware or software depends upon the particular application and design constraints imposed on the overall system.
[0163] An element, or any portion of an element, or any combination of elements may be implemented as a “processing system” that includes one or more processors. Examples of processors include microprocessors, microcontrollers, graphics processing units (GPUs) , central processing units (CPUs) , application processors, digital signal processors (DSPs) , reduced instruction set computing (RISC) processors, systems-on-chip (SoC) , baseband processors, field programmable gate arrays (FPGAs) , programmable logic devices (PLDs) , state machines, gated logic, discrete hardware circuits, and other similar hardware configured to perform the various functionality described throughout this disclosure. One or more processors in the processing system may execute software, which may be referred to as software, firmware, middleware, microcode, hardware description language, or otherwise. Software shall be construed broadly to mean instructions, instruction sets, code, code segments, program code, programs, subprograms, software components, applications, software applications, software packages, routines, subroutines, objects, executables, threads of execution, procedures, functions, or any combination thereof.
[0164] If the functionality described herein is implemented in software, the functions may be stored on, or encoded as, one or more instructions or code on a computer-readable medium, such as a non-transitory computer-readable storage medium. Computer-readable media includes computer storage media and can include a random-access memory (RAM) , a read-only memory (ROM) , an electrically erasable programmable ROM (EEPROM) , optical disk storage, magnetic disk storage, other magnetic storage devices, combinations of these types of computer-readable media, or any other medium that can be used to store computer executable code in the form of instructions or data structures that can be accessed by a computer. Storage media may be any available media that can be accessed by a computer.
[0165] Aspects, implementations, and / or use cases described herein may be implemented across many differing platform types, devices, systems, shapes, sizes, and packaging arrangements. For example, the aspects, implementations, and / or use cases may come about via integrated chip implementations and other non-module-component based devices, such as end-user devices, vehicles, communication devices, computing devices, industrial equipment, retail / purchasing devices, medical devices, artificial intelligence (AI) -enabled devices, machine learning (ML) -enabled devices, etc. The aspects, implementations, and / or use cases may range from chip-level or modular components to non-modular or non-chip-level implementations, and further to aggregate, distributed, or original equipment manufacturer (OEM) devices or systems incorporating one or more techniques described herein.
[0166] Devices incorporating the aspects and features described herein may also include additional components and features for the implementation and practice of the claimed and described aspects and features. For example, transmission and reception of wireless signals necessarily includes a number of components for analog and digital purposes, such as hardware components, antennas, RF-chains, power amplifiers, modulators, buffers, processor (s) , interleavers, adders / summers, etc. Techniques described herein may be practiced in a wide variety of devices, chip-level components, systems, distributed arrangements, aggregated or disaggregated components, end-user devices, etc., of varying configurations.
[0167] The description herein is provided to enable a person skilled in the art to practice the various aspects described herein. Various modifications to these aspects will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other aspects. Thus, the claims are not limited to the aspects described herein, but are to be interpreted in view of the full scope of the present disclosure consistent with the language of the claims.
[0168] Reference to an element in the singular does not mean “one and only one” unless specifically stated, but rather “one or more. ” Terms such as “if, ” “when, ” and “while” do not imply an immediate temporal relationship or reaction. That is, these phrases, e.g., “when, ” do not imply an immediate action in response to or during the occurrence of an action, but simply imply that if a condition is met then an action will occur, but without requiring a specific or immediate time constraint for the action to occur. The terms “may” , “might” , and “can” , as used in this disclosure, often carry certain connotations. For example, “may” refers to a permissible feature that may or may not occur, “might” refers to a feature that probably occurs, and “can” refers to a capability (e.g., capable of) . The phrase “For example” often carries a similar connotation to “may” and, therefore, “may” is sometimes excluded from sentences that include “for example” or other similar phrases.
[0169] Unless specifically stated otherwise, the term “some” refers to one or more. Combinations such as “at least one of A, B, or C” or “one or more of A, B, or C” include any combination of A, B, and / or C, such as A and B, A and C, B and C, or A and B and C, and may include multiples of A, multiples of B, and / or multiples of C, or may include A only, B only, or C only. Sets should be interpreted as a set of elements where the elements number one or more. Terms or articles such as “a” , “an” , and / or “the” may refer to one of an item, feature, element, etc., that the term or article precedes, or may refer to more than one of said item, feature, element, etc. that the term or article precedes. For example, the recitation “a widget” does not preclude reference to multiples of said widget, as “multiple widgets” necessarily includes “a widget” . Hence, the recitation “a widget” may be interpreted as “at least one widget” or, similarly, interpreted as “one or more widgets” .
[0170] Unless otherwise specifically indicated, ordinal terms such as “first” and “second” do not necessarily imply an order in time, sequence, numerical value, etc., but are used to distinguish between different instances of a term or phrase that follows each ordinal term.
[0171] Reference numbers, as used in the specification and figures, are sometimes cross-referenced among drawings to denote same or similar features. A feature that is exactly the same in multiple drawings may be labeled with the same reference number in the multiple drawings. A feature that is similar among the multiple drawings, but not exactly the same, may be labeled with reference numbers that have different leading numbers but have one or more of the same trailing numbers (e.g., 206, 306, 406, etc., may refer to similar features in the drawings) . Hence, like numbers may refer to like actions.
[0172] Structural and functional equivalents to elements of the various aspects described throughout this disclosure that are known or later come to be known to those of ordinary skill in the art are expressly incorporated herein by reference and are encompassed by the claims. The words “module, ” “mechanism, ” “element, ” “device, ” and the like may not be a substitute for the word “means. ” As such, no claim element is to be construed as a means plus function unless the element is expressly recited using the phrase “means for. ” As used herein, the phrase “based on” shall not be construed as a reference to a closed set of information, one or more conditions, one or more factors, or the like. In other words, the phrase “based on A” , where “A” may be information, a condition, a factor, or the like, shall be construed as “based at least on A” unless specifically recited differently.
[0173] The following examples are illustrative only and may be combined with other examples or teachings described herein, without limitation.
[0174] Example 1 is a method of wireless communication at a UE, including: receiving, from a network entity, control signaling configuring: a channel state information reference signal (CSI-RS) resource with a physical resource block (PRB) bundling configuration; and a report configuration based on the CSI-RS resource; receiving, from the network entity, a CSI-RS corresponding to the CSI-RS resource; and transmitting, to the network entity, a report based on the report configuration and the CSI-RS.
[0175] Example 2 is the method of example 1, where the PRB bundling configuration includes a frequency-domain PRB bundling configuration including at least one of: a precoder resource block group (PRG) ; a number of PRGs; or a PRG index for each PRG in the PRGs.
[0176] Example 3 is the method of example 2, further including: determining the PRG based on at least one of: allocated resource blocks (RBs) for the CSI-RS; RBs for a bandwidth part; a reference bandwidth; a bandwidth of the CSI-RS; a configured frequency-domain granularity for the report; or a frequency-domain granularity for a linked report, where the receiving the CSI-RS includes receiving the CSI-RS based on the PRG.
[0177] Example 4 is the method of any of examples 1-3, where the PRB bundling configuration includes a time-domain PRB bundling configuration including at least one of: a periodicity of a time-domain bundling window; a starting location of the time-domain bundling window; or a duration of the time-domain bundling window, where the receiving the CSI-RS includes receiving the CSI-RS on multiple transmission occasions based on the time-domain PRB bundling configuration.
[0178] Example 5 is the method of example 4, where the time-domain PRB bundling configuration configures at least one of: a fixed length time-domain bundling window or a variable length time-domain bundling window.
[0179] Example 6 is the method of any of examples 4-5, further including: determining a start of the time-domain bundling window based on at least one of: an update of at least one radio resource control (RRC) parameter for the CSI-RS; bandwidth part switching; transmission of a sounding reference signal (SRS) associated with the CSI-RS resource; transmission of a linked report; an active period of cell discontinuous transmission (DTX) operation; an active time of UE discontinuous reception (DRX) operation; or second control signaling indicating a start of the time-domain bundling window, where the receiving the CSI-RS includes receiving the CSI-RS based on the start of the time-domain bundling window.
[0180] Example 7 is the method of any of examples 1-6, further including: transmitting, to the network entity, a UE capability indicating support for at least one of: PRB bundling for the CSI-RS in a time-domain; PRB bundling for the CSI-RS in a frequency-domain; PRB bundling for the CSI-RS in a time and frequency-domain; a minimum or a maximum bundling size in the frequency-domain; a minimum or a maximum bundling size in the time-domain; types of CSI-RSs for PRB bundling; or report configurations based on a CSI-RS with PRB bundling.
[0181] Example 8 is the method of any of examples 1-7, where the control signaling further configures a second report configuration that is linked to at least one of: the report configuration; or the SRS associated with the CSI-RS resource.
[0182] Example 9 is the method of example 8, further including: transmitting, to the network entity, a second report based on the second report configuration or an SRS associated with the CSI-RS resource.
[0183] Example 10 is the method of any of examples 1-9, further including: receiving, from the network entity, second control signaling triggering the report and the CSI-RS resource, the second control signaling indicating a bundling size for the CSI-RS; where the receiving the CSI-RS includes receiving the CSI-RS based on the bundling size for the CSI-RS, and where the transmitting the report includes transmitting the report based on the second control signaling.
[0184] Example 11 is the method of any of examples 1-10, where the report configuration configures the UE to report at least one of a wideband parameter or a subband parameter, and where the at least one of the wideband parameter or the subband parameter includes at least one of: a rank indicator (RI) ; a CSI-RS resource indicator (CRI) ; a channel quality indicator (CQI) ; a precoder matrix indicator (PMI) ; a layer indicator (LI) ; a phase offset (PO) ; a delay offset (DO) ; a frequency offset (FO) ; intermediate results for performance monitoring of a machine learning (ML) model; or results for performance monitoring of the ML model.
[0185] Example 12 is the method of any of examples 1-11, where the CSI-RS resource is configured as a channel measurement resource; where the control signaling further configures another CSI-RS resource as at least one: interference measurement resource, or measurement resource for the performance monitoring of the ML model.
[0186] Example 13 is the method of any of examples 1-12, where the CSI resource is associated with at least one of: one or more precoders applied at different granularities in a frequency-domain; or multiple transmission occasions based on the one or more precoders.
[0187] Example 14 is a method of wireless communication at a network entity, including: transmitting, to a user equipment (UE) , control signaling configuring: a channel state information reference signal (CSI-RS) resource with a physical resource block (PRB) bundling configuration; and a report configuration based on the CSI-RS resource; transmitting, to the UE, a CSI-RS corresponding to the CSI-RS resource; and receiving, from the UE, a report based on the report configuration and the CSI-RS.
[0188] Example 15 is the method of example 14, where the PRB bundling configuration includes a frequency-domain PRB bundling configuration including at least one of: a precoder resource block group (PRG) ; a number of PRGs; or a PRG index for each PRG in the PRGs.
[0189] Example 16 is the method of example 15, further including: determining the PRG based on at least one of: allocated resource blocks (RBs) for the CSI-RS; RBs for a bandwidth part; a reference bandwidth; a bandwidth of the CSI-RS; a configured frequency-domain granularity for the report; or a frequency-domain granularity for a linked report, where the transmitting the CSI-RS includes transmitting the CSI-RS based on the PRG.
[0190] Example 17 is the method of any of examples 14-16, where the PRB bundling configuration includes a time-domain PRB bundling configuration including at least one of: a periodicity of a time-domain bundling window; a starting location of the time-domain bundling window; or a duration of the time-domain bundling window, where the transmitting the CSI-RS includes transmitting the CSI-RS on multiple transmission occasions based on the time-domain PRB bundling configuration.
[0191] Example 18 is the method of example 17, where the time-domain PRB bundling configuration configures at least one of: a fixed length time-domain bundling window or a variable length time-domain bundling window.
[0192] Example 19 is the method of any of examples 17-18, further including: determining a start of the time-domain bundling window based on at least one of: an update of at least one radio resource control (RRC) parameter for the CSI-RS; bandwidth part switching; transmission of a sounding reference signal (SRS) associated with the CSI-RS resource; transmission of a linked report; an active period of cell discontinuous transmission (DTX) operation; an active time of UE discontinuous reception (DRX) operation; or second control signaling indicating a start of the time-domain bundling window, where the transmitting the CSI-RS includes transmitting the CSI-RS based on the start of the time-domain bundling window.
[0193] Example 20 is the method of any of examples 14-19, further including: receiving, from the UE, a UE capability indicating support for at least one of: PRB bundling for the CSI-RS in a time-domain; PRB bundling for the CSI-RS in a frequency-domain; PRB bundling for the CSI-RS in a time and frequency-domain; a minimum or a maximum bundling size in the frequency-domain; a minimum or a maximum bundling size in the time-domain; types of CSI-RSs for PRB bundling; or report configurations based on a CSI-RS with PRB bundling.
[0194] Example 21 is the method of any of examples 14-20, where the control signaling further configures a second report configuration that is linked to at least one of: the report configuration; or the SRS associated with the CSI-RS resource.
[0195] Example 22 is the method of example 21, further including: receiving, from the UE, a second report based on the second report configuration or an SRS associated with the CSI-RS resource.
[0196] Example 23 is the method of any of examples 14-22, further including: transmitting, to the UE, second control signaling triggering the report and the CSI-RS resource, the second control signaling indicating a bundling size for the CSI-RS; where the transmitting the CSI-RS includes transmitting the CSI-RS based on the bundling size for the CSI-RS, and where the receiving the report includes receiving the report based on the second control signaling.
[0197] Example 24 is the method of any of examples 14-23, where the report configuration configures the UE to report at least one of a wideband parameter or a subband parameter, and where the at least one of the wideband parameter or the subband parameter includes at least one of: a rank indicator (RI) ; a CSI-RS resource indicator (CRI) ; a channel quality indicator (CQI) ; a precoder matrix indicator (PMI) ; a layer indicator (LI) ; a phase offset (PO) ; a delay offset (DO) ; a frequency offset (FO) ; intermediate results for performance monitoring of a machine learning (ML) model; or results for performance monitoring of the ML model.
[0198] Example 25 is the method of any of examples 14-24, where the CSI-RS resource is configured as a channel measurement resource; where the control signaling further configures another CSI-RS resource as at least one: interference measurement resource, or measurement resource for the performance monitoring of the ML model.
[0199] Example 26 is the method of any of examples 14-25, where the CSI resource is associated with at least one of: one or more precoders applied at different granularities in a frequency-domain; or multiple transmission occasions based on the one or more precoders.
[0200] Example 27 is an apparatus for wireless communication comprising a memory, a transceiver, and a processor coupled to the memory, the apparatus being configured to implement a method as in any of examples 1-26.
[0201] Example 28 is an apparatus for wireless communication including means for implementing a method as in any of examples 1-26.
[0202] Example 29 is a non-transitory computer-readable medium storing computer executable code, the computer executable code, when executed by a processor, causes the processor to implement a method as in any of examples 1-26.
Claims
1.A method of wireless communication at a user equipment, UE (102) , comprising:receiving (418) , from a network entity (104) , control signaling configuring:a channel state information reference signal, CSI-RS, resource with a physical resource block, PRB, bundling configuration; anda report configuration based on the CSI-RS resource;receiving (430) , from the network entity (104) , a CSI-RS corresponding to the CSI-RS resource; andtransmitting (434) , to the network entity (104) , a report based on the report configuration and the CSI-RS.2.The method of claim 1, wherein the PRB bundling configuration comprises a frequency-domain PRB bundling configuration comprising at least one of:a precoder resource block group, PRG;a number of PRGs; ora PRG index for each PRG in the PRGs.3.The method of claim 2, further comprising:determining (527a) the PRG based on at least one of:allocated resource blocks, RBs, for the CSI-RS;RBs for a bandwidth part;a reference bandwidth;a bandwidth of the CSI-RS;a configured frequency-domain granularity for the report; ora frequency-domain granularity for a linked report,wherein the receiving (430) the CSI-RS comprises receiving the CSI-RS based on the PRG.4.The method of any of claims 1-3, wherein the PRB bundling configuration comprises a time-domain PRB bundling configuration comprising at least one of:a periodicity of a time-domain bundling window;a starting location of the time-domain bundling window; ora duration of the time-domain bundling window,wherein the receiving (430) the CSI-RS comprises receiving the CSI-RS on multiple transmission occasions based on the time-domain PRB bundling configuration.5.The method of claim 4, wherein the time-domain PRB bundling configuration configures at least one of: a fixed length time-domain bundling window or a variable length time-domain bundling window.6.The method of any of claims 4-5, further comprising:determining (528a) a start of the time-domain bundling window based on at least one of:an update of at least one radio resource control, RRC parameter for the CSI-RS;bandwidth part switching;transmission of a sounding reference signal, SRS, associated with the CSI-RS resource;transmission of a linked report;an active period of cell discontinuous transmission, DTX, operation;an active time of UE discontinuous reception, DRX, operation; orsecond control signaling indicating a start of the time-domain bundling window,wherein the receiving (430) the CSI-RS comprises receiving the CSI-RS based on the start of the time-domain bundling window.7.The method of any of claims 1-6, further comprising:transmitting (414) , to the network entity (104) , a UE capability indicating support for at least one of:PRB bundling for the CSI-RS in a time-domain;PRB bundling for the CSI-RS in a frequency-domain;PRB bundling for the CSI-RS in a time and frequency-domain;a minimum or a maximum bundling size in the frequency-domain;a minimum or a maximum bundling size in the time-domain;types of CSI-RSs for PRB bundling; orreport configurations based on a CSI-RS with PRB bundling.8.The method of any of claims 1-7, wherein the control signaling further configures a second report configuration that is linked to at least one of:the report configuration; orthe SRS associated with the CSI-RS resource.9.The method of any of claims 1-8, further comprising:receiving (426) , from the network entity (104) , second control signaling triggering the report and the CSI-RS resource, the second control signaling indicating a bundling size for the CSI-RS;wherein the receiving (430) the CSI-RS comprises receiving the CSI-RS based on the bundling size for the CSI-RS, and wherein the transmitting (434) the report comprises transmitting the report based on the second control signaling.10.The method of any of claims 1-9, wherein the report configuration configures the UE (102) to report at least one of a wideband parameter or a subband parameter, and wherein the at least one of the wideband parameter or the subband parameter comprises at least one of:a rank indicator, RI;a CSI-RS resource indicator, CRI;a channel quality indicator, CQI;a precoder matrix indicator, PMI;a layer indicator, LI;a phase offset, PO;a delay offset, DO;a frequency offset, FO;intermediate results for performance monitoring of a machine learning, ML, model; orresults for performance monitoring of the ML model.11.The method of any of claims 1-10, wherein the CSI-RS resource is configured as a channel measurement resource;wherein the control signaling further configures another CSI-RS resource as at least one:interference measurement resource, ormeasurement resource for the performance monitoring of the ML model.12.The method of any of claims 1-11, wherein the CSI resource is associated with at least one of:one or more precoders applied at different granularities in a frequency-domain; ormultiple transmission occasions based on the one or more precoders.13.A method of wireless communication at a network entity (104) , comprising:transmitting (418) , to a user equipment, UE (102) , control signaling configuring:a channel state information reference signal, CSI-RS, resource with a physical resource block, PRB, bundling configuration; anda report configuration based on the CSI-RS resource;transmitting (430) , to the UE (102) , a CSI-RS corresponding to the CSI-RS resource; andreceiving (434) , from the UE (102) , a report based on the report configuration and the CSI-RS.14.The method of claim 13, wherein the PRB bundling configuration comprises a frequency-domain PRB bundling configuration comprising at least one of:a precoder resource block group, PRG;a number of PRGs; ora PRG index for each PRG in the PRGs.15.The method of any of claims 13-14, wherein the PRB bundling configuration comprises a time-domain PRB bundling configuration comprising at least one of:a periodicity of a time-domain bundling window;a starting location of the time-domain bundling window; ora duration of the time-domain bundling window,wherein the transmitting (430) the CSI-RS comprises transmitting the CSI-RS on multiple transmission occasions based on the time-domain PRB bundling configuration.16.The method of claim 15, further comprising:determining (528b) a start of the time-domain bundling window based on at least one of:an update of at least one radio resource control, RRC parameter for the CSI-RS;bandwidth part switching;transmission of a sounding reference signal, SRS, associated with the CSI-RS resource;transmission of a linked report;an active period of cell discontinuous transmission, DTX, operation;an active time of UE discontinuous reception, DRX, operation; orsecond control signaling indicating a start of the time-domain bundling window,wherein the transmitting (430) the CSI-RS comprises transmitting the CSI-RS based on the start of the time-domain bundling window.17.The method of any of claims 13-16, wherein the control signaling further configures a second report configuration that is linked to at least one of:the report configuration; orthe SRS associated with the CSI-RS resource.18.An apparatus for wireless communication comprising a memory, a transceiver, and a processor coupled to the memory and the transceiver, the apparatus being configured to implement a method as in any of claims 1-17.