Multiple channel state information feedback for multi-user multiple-input multiple-output pairing
By configuring UEs to report multiple CSIs for different beams, the system addresses interference challenges in MU-MIMO, improving cell coverage and spectrum efficiency through optimal precoder selection.
Patent Information
- Application Number
- PCT/CN2024/071977
- Authority / Receiving Office
- WO · WO
- Patent Type
- Applications
- Current Assignee / Owner
- Filing Date
- 2024-01-12
- Publication Date
- 2025-07-17
AI Technical Summary
In multi-user multiple-input multiple-output (MU-MIMO) systems, existing technologies face challenges in efficiently managing interference between multiple UEs due to limited CSI feedback, which hinders optimal precoder selection and leads to reduced cell coverage and spectrum efficiency.
The UE is configured to report multiple CSIs for different beams, allowing the network entity to determine orthogonal transmission paths and minimize interference, by receiving a CSI report configuration including CSI-RS resources, codebook configurations, and reporting parameters for multiple CSIs.
This approach enhances cell coverage and spectrum efficiency by enabling the network entity to select appropriate digital precoders for each UE, reducing interference and optimizing MU-MIMO operations.
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Figure CN2024071977_17072025_PF_FP_ABST
Abstract
Description
MULTIPLE CHANNEL STATE INFORMATION FEEDBACK FOR MULTI-USER MULTIPLE-INPUT MULTIPLE-OUTPUT PAIRINGTECHNICAL FIELD
[0001] The present disclosure relates generally to wireless communication, and more particularly, to multiple channel state information (CSI) feedback for multi-user multiple-input multiple-output (MU-MIMO) pairing.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, improvements in spectral efficiency using multiple CSI feedback for MU-MIMO pairing.
[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 configure a CSI report for a UE to indicate CSI based on measurement of the downlink channel. In MIMO systems, the CSI can provide useful information for the network entity to select a digital precoder for the UE.
[0007] To improve cell coverage and spectrum efficiency (SE) , the network entity may transmit on a physical downlink shared channel (PDSCH) for multiple UEs based on a MU-MIMO operation. In some examples, the network entity transmits on the PDSCHs for different UEs using a same analog beam and different digital precoders.
[0008] In other examples, the network entity transmits on the PDSCHs for different UEs using different analog beams and digital precoders, which may require the network entity to use more than one antenna panel. In a scenario with two UEs, the network entity requires the CSIs from both UEs measured from both beams, so that the network entity can determine whether the two beams for both UEs are orthogonal or do not cause strong mutual interference. Thus, the network entity may transmit to the first UE using the first beam and the second UE using the second beam, where the first UE does not experience strong interference from the second beam and the second UE does not experience strong interference from the first beam. However, it is difficult for the MU-MIMO pairing when the UE reports only one CSI for one beam.
[0009] The present disclosure addresses the above-noted and other deficiencies by the UE reporting multiple CSIs for different beams. Based on UE capabilities, the network entity transmits a control signaling configuring a CSI report configuration including a list of CSI reference signal (CSI-RS) resources for channel measurement, at least one codebook configuration, a parameter configuring the CSI report including multiple CSIs, and optionally configuring at least one of the parameters: a list of CSI-RS resources for interference measurement, a list of CSI interference measurement (CSI-IM) resources for interference measurement, at least one frequency granularity for CSI report, at least one codebook subset restriction or at least one rank restriction. The network entity may transmit control signaling activating or triggering the CSI report. The network transmits the CSI-RSs using different transmission beams based on the configured CSI-RS resources for channel measurement and / or the configured CSI-RS / CSI-IM resources for interference measurement. The UE transmits the CSI report including multiple CSIs corresponding to the different beams based on the CSI-RSs and the CSI report configuration when the CSI report meets the requirement of a minimum processing delay and CSI processing unit (CPU) occupancy rule.
[0010] According to some aspects, a UE receives, from a network entity, a CSI report configuration indicating a plurality of CSI-RS resources for channel measurement, a codebook configuration, and a reporting parameter for a CSI report to include a plurality of CSIs. The UE receives, from the network entity, a plurality of CSI-RSs on the plurality of CSI-RS resources. The UE transmits, to the network entity, the CSI report including the plurality of CSIs measured from the plurality of CSI-RSs based on the CSI report configuration.
[0011] According to some aspects, a network entity transmits, to a UE, a CSI report configuration indicating a plurality of CSI-RS resources for channel measurement, a codebook configuration, and a reporting parameter for a CSI report to include a plurality of CSIs. The network entity transmits, to the UE, a plurality of CSI-RSs on the plurality of CSI-RS resources. The network entity receives, from the UE, the CSI report including the plurality of CSIs measured from the plurality of CSI-RSs based on the CSI report configuration.BRIEF DESCRIPTION OF THE DRAWINGS
[0012] 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.
[0013] FIGs. 2A-2B illustrate diagrams of MU-MIMO schemes according to an embodiment.
[0014] FIG. 3 illustrates a signaling diagram illustrating communications between a UE and a network entity for multiple CSI feedback for MU-MIMO according to an embodiment.
[0015] FIGs. 4A-4E illustrate diagrams of a CSI report based on a number of reported CSIs according to an embodiment.
[0016] FIG. 5 is a flowchart of a method of wireless communication at a UE according to an embodiment.
[0017] FIG. 6 is a flowchart of a method of wireless communication at a network entity according to an embodiment.
[0018] FIG. 7 is a diagram illustrating a hardware implementation for an example UE apparatus according to some embodiments.
[0019] FIG. 8 is a diagram illustrating a hardware implementation for one or more example network entities according to some embodiments.
[0020] In FIGs. 1-8 like reference numbers refer to like features.DETAILED DESCRIPTION
[0021] 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) .
[0022] 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.
[0023] 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.
[0024] 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.
[0025] 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.
[0026] 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. ”
[0027] 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.
[0028] 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) .
[0029] 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.
[0030] 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.
[0031] 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.
[0032] 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.
[0033] Still referring to FIG. 1, in certain aspects, any of the UEs 102 may include a multi-CSI component 140 configured to receive, from a network entity, a CSI report configuration indicating a plurality of CSI-RS resources for channel measurement, a codebook configuration, and a reporting parameter for a CSI report to include a plurality of CSIs. The multi-CSI component 140 is further configured to receive, from the network entity, a plurality of CSI-RSs on the plurality of CSI-RS resources. The multi-CSI component 140 is further configured to transmit, to the network entity, the CSI report including the plurality of CSIs measured from the plurality of CSI-RSs based on the CSI report configuration.
[0034] In certain aspects, any of the base stations 104 or a network entity of the base stations 104 may include a multi-CSI configuration component 150 configured to transmit, to a UE, a CSI report configuration indicating a plurality of CSI-RS resources for channel measurement, a codebook configuration, and a reporting parameter for a CSI report to include a plurality of CSIs. The multi-CSI configuration component 150 is further configured to transmit, to the UE, a plurality of CSI-RSs on the plurality of CSI-RS resources. The multi-CSI configuration component 150 is further configured to receive, from the UE, the CSI report including the plurality of CSIs measured from the plurality of CSI-RSs based on the CSI report configuration.
[0035] 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.
[0036] FIG. 2A illustrates a diagram 200a of a first MU-MIMO scheme according to an embodiment. To improve the cell coverage and spectrum efficiency (SE) , the network entity may transmit the physical downlink shared channel (PDSCH) for multiple UEs based on a multi-user MIMO (MU-MIMO) operation. In some aspects, the network entity may transmit a PDSCH for different UEs based on the same analog beam and different digital precoders, referred to as a first MU-MIMO scheme as shown in Figure 2A. The network entity may transmit from an antenna panel having a number of horizontal beams (e.g., 2 horizontal beams) and a number of vertical beams (e.g., 4 vertical beams) . Further, the network entity may transmit using a number of horizontal precoders per beam (e.g., 8 horizontal precoders per beam) and a number of vertical precoders per beam (e.g., 4 vertical precoders per beam) . For example, the network entity may transmit a first PDSCH to a first UE 102a using beam 201 and precoder 202a. The network entity may transmit a second PDSCH to a second UE 102b using the beam 201 and precoder 202b.
[0037] For the first MU-MIMO scheme, the network entity selects orthogonal precoders 202a and 202b to transmit the PDSCHs for both the first UE 102a and the second UE 102b. Thus, the network entity requires the CSIs for both the first UE 102a and the second UE 102b measured from the beam so that it can create the orthogonal digital precoders and select the modulation and coding scheme (MCS) for both the first UE 102a and the second UE 102b.
[0038] FIG. 2B illustrates a diagram 200b of a second MU-MIMO scheme according to an embodiment. In some aspects, the network entity may transmit the PDSCHs for the first UE 102a and the second UE 102b based on different analog beams 201a, 201b and digital precoders 202a, 202b based on the use of more than one antenna panel, as shown in Figure 2B. For the second MU-MIMO scheme, the network entity requires the CSIs for both the first UE 102a and the second UE 102b measured from both beams so that the network entity can determine whether the two beams for the first UE 102a and the second UE 102b are orthogonal or whether the two beams would cause mutual interference. Thus, to apply the second MU-MIMO scheme, the network entity may transmit a PDSCH to the first UE 102a from a first beam 201a and transmit a PDSCH to the second UE 102b from a second beam 201b such that the first and second beams would not mutually interfere with one another. Therefore, to facilitate MU-MIMO pairing, the first UE 102a and the second UE 102b may report CSIs for different beams. In order to report multiple CSIs, the first UE 102a and the second UE 102b may be configured for the codebook / channel measurement resource (CMR) / interference measurement resource (IMR) for the CSI report, the selection of the beams for the CSI report, the CSI report content and format, a minimum CSI processing delay, and a CSI processing unit (CPU) occupancy rule.
[0039] FIG. 3 illustrates a signaling diagram 300 illustrating communications between a UE 102 and a network entity 104 for multiple CSI feedback for MU-MIMO according to an embodiment. The UE 102 may optionally transmit 302, to the network entity 104, UE capabilities indicating supported configurations for CSI reporting including multiple CSIs. The UE 102 may report at least one of the following UE capabilities: support for CSI reporting including multiple CSIs; the maximum number of reported CSIs; the maximum number of CSI-RS resources configured as CMRs for a CSI report configuration; the maximum number of antenna ports across CMRs for a CSI report configuration; supported time-domain behavior (e.g., periodic, semi-persistent, aperiodic) for the CMRs; supported time-domain behavior (e.g., periodic, semi-persistent, aperiodic, UE-initiated / event-driven) for the CSI report; supported codebook type (s) (e.g., Type1 single-panel codebook (as defined in 3GPP Technical Specification (TS) 38.214 section 5.2.2.2.1) ) , Type1 multi-panel codebook (as defined in 3GPP TS 38.214 section 5.2.2.2.2) , Type2 codebook (as defined in 3GPP TS 38.214 section 5.2.2.2.3) , Type2 port selection codebook (as defined in 3GPP TS 38.214 section 5.2.2.2.4) , eType2 codebook (as defined in 3GPP TS 38.214 section 5.2.2.2.5) , eType2 port selection codebook (as defined in 3GPP TS 38.214 section 5.2.2.2.6) , FeType2 port selection codebook (as defined in 3GPP TS 38.214 section 5.2.2.2.7) , eType2 codebook for coherent joint transmission (as defined in 3GPP TS 38.214 section 5.2.2.2.8) , FeType2 port selection codebook for coherent joint transmission (as defined in 3GPP TS 38.214 section 5.2.2.2.9) , eType2 codebook for predicted PMI (as defined in 3GPP TS 38.214 section 5.2.2.2.10) , and / or FeType2 port selection codebook for predicted PMI (as defined in 3GPP TS 38.214 section 5.2.2.2.11) for the CSI report with multiple CSIs.
[0040] The network entity 104 transmits 304 control signaling configuring a CSI report configuration including a plurality of CSI-RS resources for channel measurement (e.g., a list of CSI-RS resources for channel measurement) , at least one codebook configuration, a parameter configuring the CSI report including multiple CSIs. In some aspects, the network entity may optionally configure at least one of: a list of CSI-RS resources for interference measurement, a list of CSI-IM resources for interference measurement, at least one frequency granularity for the CSI report, at least one codebook subset restriction, and / or at least one rank restriction. The network entity 104 may transmit 304, to the UE 102, the control signaling by RRC signaling (e.g., RRCReconfiguration or CSI-ReportConfig) .
[0041] In some aspects, the network entity 104 configures a list of CSI-RS resources for channel measurement. The network entity 104 may configure a list of CSI-RS resources for interference measurement and / or a list of CSI-IM resources for interference measurement. In some aspects, the number of CSI-RS resources for channel measurement may be the same as the number of CSI-RS resources for interference measurement. The CSI-RS resources for channel measurement and CSI-RS / CSI-IM resources for interference measurement may have a resource-wise one-to-one association. The UE 102 measures one CSI based on one CSI-RS resource for channel measurement as well as the associated CSI-RS / CSI-IM resource. The UE 102 may apply the same spatial domain reception filter to receive the CSI-RS resource for channel measurement and the associated CSI-RS / CSI-IM resource.
[0042] In some aspects, the CSI-RS resources for channel measurement may be associated with common CSI-RS / CSI-IM resource for interference measurement. The UE 102 may measure one CSI based on one CSI-RS resource for channel measurement and the associated CSI-RS / CSI-IM resource. In some aspects, the network entity 104 may not configure the quasi-co-location (QCL) type D (spatial reception parameters) indication in the TCI state for the CSI-RS resources for channel measurement.
[0043] In some aspects, for semi-persistent CSI reporting or aperiodic CSI reporting, the network entity 104 may optionally transmit 306 a medium access control-control element (MAC CE) or downlink control information (DCI) activating or triggering the CSI report. For semi-persistent CSI-RS or aperiodic CSI-RS, the network entity may transmit 306 a MAC CE or DCI activating or triggering the CSI-RS.
[0044] In aspects, the network entity 104 transmits 308 the CSI-RSs on the CSI-RS resources in a CSI-RS resource set for channel measurement based on the same time domain behavior. The network entity 104 may configure the same value for at least one of the parameters for the CSI-RS resources in a CSI-RS resource set for channel measurement including at least one of: bandwidth, subcarriers, periodicity, number of antenna ports, energy per resource element (EPRE) ratio between PDSCH and the CSI-RS (e.g., powerControlOffset) , EPRE ratio between the CSI-RS and secondary synchronization signal (SSS) (e.g., powerControlOffsetSS) , and / or scrambling identifier (ID) . The network entity 104 may transmit 308 the CSI-RSs on CSI-RS resources in a CSI-RS resource set for channel measurement within one slot or S consecutive slots, where S may be predefined (e.g., S=2) or reported by the UE capability. Thus, the UE 102 expects the network entity 104 to configure the same value for at least one of the parameters for the CSI-RS resource in a CSI-RS resource set for channel measurement including at least one of: bandwidth, subcarriers, periodicity, number of antenna ports, EPRE ratio between PDSCH and the CSI-RS (e.g., powerControlOffset) , EPRE ratio between the CSI-RS and SSS (e.g., powerControlOffsetSS) , and / or scrambling ID. The UE 102 may further expect the network entity 104 to transmit 308 the CSI-RSs on CSI-RS resources within a CSI-RS resource set for channel measurement in one slot or S consecutive slots (e.g., S=2) .
[0045] In some aspects, the network entity 104 may refrain from configuring more than one resource group for the CMRs. Thus, the network entity 104 may refrain from configuring the CSI report with multiple CSIs based on a non-coherent joint transmission scheme.
[0046] In some aspects, the network entity 104 configures at least one codebook configuration (e.g., codebookConfig) for the CSI-RS resources for channel measurement. The network entity 104 may configure a common codebook configuration for the CSI-RS resources for channel measurement. In some aspects, the network entity 104 may configure separate codebook configurations, where a different codebook configuration corresponds to different CSI-RS resources for channel measurement.
[0047] In some aspects, the network entity 104 may refrain from configuring the CSI report with multiple CSIs for a certain codebook type (e.g., Type1 single-panel codebook, Type1 multi-panel codebook, Type2 codebook, Type2 port selection codebook, eType2 codebook, eType2 port selection codebook, FeType2 port selection codebook, eType2 codebook for coherent joint transmission, FeType2 port selection codebook for coherent joint transmission, eType2 codebook for predicted PMI, and / or FeType2 port selection codebook for predicted PMI) .
[0048] In some aspects, the network entity 104 configures at least one codebook subset restriction for the CSI-RS resources for channel measurement. The codebook subset restriction indicates a subset of candidate precoders from the configured codebook for CSI report. The network entity 104 may configure a common codebook subset restriction for the CSI-RS resources for channel measurement. In some aspects, the network entity 104 may configure separate codebook subset restrictions, where a different codebook subset restriction corresponds to different CSI-RS resources for channel measurement.
[0049] In some aspects, the network entity 104 configures at least one rank indicator (RI) restriction, i.e. rank restriction, for the CSI-RS resources for channel measurement. The RI restriction indicates a list of candidate ranks for the CSI report. The network entity 104 may configure a common RI restriction for the CSI-RS resources for channel measurement. In aspects, the network entity 104 configures separate RI restrictions, where a different RI restriction corresponds to different CSI-RS resources for channel measurement.
[0050] The UE 102 may determine whether to report the CSI for the received CSI-RS resources and / or CSI-IM resources based on whether the scheduling offset meets the minimum processing delay requirement and the CPU occupancy rule. If the UE 102 determines to report the CSI, the UE 102 may transmit 310, to the network entity 104, the CSI report based on the CSI report configuration via an uplink channel (e.g., PUSCH or PUCCH) .
[0051] In some aspects, the UE 102 may determine whether to report CSI for a CSI-RS resource based on the measured CSI and / or beam quality of the CSI-RS resource. The UE 102 may determine to report the CSI for a CSI-RS resource if the UE 102 determines that one or more of the following conditions is true:
[0052] The measured beam quality (e.g., layer 1 reference signal received power (L1-RSRP) or layer 1 signal-to-interference plus noise ratio (L1-SINR) ) of the CSI-RS resource satisfies a first threshold criterion (e.g., the measured beam quality is above or equal to a first threshold) . The measured beam quality (e.g., L1-RSRP / L1-SINR) of the CSI-RS resource is above or equal to the highest beam quality among the CSI-RS resources in the CSI-RS resource set minus a first offset. The measured channel quality indicator (CQI) of the CSI-RS resource satisfies a second threshold criterion (e.g., the measured CQI for the CSI-RS resource is above or equal to the second threshold) . The measured CQI of the CSI-RS resource is above or equal to the highest CQI among the CSI-RS resources in the CSI-RS resource set minus a second offset. The spectrum efficiency (SE) of the measured CSI for the CSI-RS resource satisfies a third threshold criterion (e.g., the SE of the measured CQI for the CSI-RS resource is above or equal to the third threshold) . The SE of the measured CSI for the CSI-RS resource is above or equal to the highest SE among the CSI-RS resources in the CSI-RS resource set minus a third offset.
[0053] In some aspects, the first threshold, the second threshold, and / or the third threshold may be pre-defined or configured by the network entity. In some aspects, the first offset, the second offset, and / or the third offset may be pre-defined or configured by the network entity.
[0054] In some aspects, the network entity 104 configures the CSI-RS resource selection scheme. In an example, for the first MU-MIMO scheme, a first CSI-RS resource selection scheme includes reporting the top N CSIs (e.g., CSIs from the CSI-RS resources with the best beam quality, highest CQI, and / or highest SE) . In another example, for the second MU-MIMO scheme, a second CSI-RS resource selection scheme includes reporting the top N1 CSIs (e.g., CSIs from the CSI-RS resources with the best beam quality, highest CQI, and / or highest SE) and the bottom N2 CSIs (e.g., CSIs from the CSI-RS resources with the lowest beam quality, lowest CQI, and / or lowest SE) , where N1 and N2 may be pre-defined or configured by the network entity. In some aspects, the CSI-RS resource selection scheme may be predefined.
[0055] In some aspects, the CSI report may include at least one of the CSI-RS resource indicator (CRI) , the RI, the PMI, the CQI, and / or the LI. The UE 102 may report the CSIs based on the configured frequency domain granularity. Thus, the UE 102 may report wideband CSIs including at least one of the CRI, the RI, the LI, the wideband CQI, and / or the wideband PMI. The UE 102 may report subband CSI including the CQI and / or the PMI for each subband.
[0056] In some aspects, the network entity 104 may configure one PUCCH / PUSCH resource for the UE 102 to report the CSIs. In some aspects, the network entity may configure multiple PUCCH / PUSCH resources for the UE 102 to report the CSIs. The UE 102 may report different CSIs in different PUCCH / PUSCH resources. Alternatively, the UE 102 may report the same CSIs in different PUCCH / PUSCH resources to increase the probability of correct decoding of the CSIs by the network entity 104.
[0057] In some aspects, the network entity 104 may configure at least one report quantity indicating the report content for each CSI. The network entity 104 may configure one common report quantity for the CSIs indicating a common report content for each CSI. Alternatively, the network entity may configure separate report quantities in which different report quantities correspond to different CSIs.
[0058] The network entity 104 may configure the UE 102 to report at least one of the following for each CSI: CRI, RI, PMI, CQI, LI, and / or wideband precoder information for the PMI. In one example, the network entity 104 may configure at least one of the report quantities: cri-RI-PMI-CQI, cri-RI-i1, cri-RI-i1-CQI, cri-RI-CQI, and / or cri-RI-LI-PMI-CQI. The UE 102 may report the corresponding CSI component (s) based on the configured report quantity.
[0059] In some aspects, the UE 102 may report one CRI component to jointly report the CRI for each CSI. For example, as described with reference to FIGs. 4B, 4C, and 4D, the UE 102 may report a CRI bitmap indicating which CSI-RS resources the reported CSIs correspond to. In some aspects, the UE 102 may report a common RI for all the reported CSIs.
[0060] In some aspects, the UE 102 reports a CSI component from the first reported CSI-RS resource until the last reported CSI-RS resource and the next CSI component from the first reported CSI-RS resource until the last reported CSI-RS resource. Table 1 illustrates one example for the wideband CSI report including multiple CSIs for CSI part 1.
[0061] Table 1
[0062] In some aspects, the UE 102 reports all the CSI components for a CSI part (e.g., CSI part 1, wideband CSI in CSI part 2, and subband CSI in CSI part 2) from the first reported CSI-RS resource and then all the CSI components for a CSI part (e.g., CSI part 1, wideband CSI in CSI part 2, and subband CSI in CSI part 2) for the next reported CSI-RS resource. Table 2 illustrates one example for the wideband CSI report including multiple CSIs for CSI part 1.
[0063] Table 2
[0064] In some aspects, for the CSI report including multiple CSIs, after the CSI report (re) configuration, serving cell activation, bandwidth part (BWP) change, or activation of semi-persistent (SP) -CSI report, the UE 102 reports a CSI report (or a CSI in a CSI report) only after receiving at least one CSI-RS transmission occasion for each of the CSI-RS resources in the corresponding CSI-RS resource set for channel measurement and one CSI-RS and / or CSI-IM resource transmission occasion for the CSI-RS and / or CSI-IM resource in the corresponding resource set for interference measurement no later than the CSI reference resource and within the same discontinuous reception (DRX) active time, when DRX is configured, and drops the report otherwise. The CSI reference resource may be as defined in 3GPP TS 38.214 section 5.2.2.5.
[0065] In some aspects, for the CSI report including multiple CSIs, after the CSI report (re) configuration, serving cell activation, BWP change, or activation of SP-CSI report, the UE 102 reports a CSI report (or a CSI in a CSI report) only after receiving at least one CSI-RS transmission occasion for each of the CSI-RS resources in the corresponding CSI-RS resource set for channel measurement and one CSI-RS and / or CSI-IM resource transmission occasion for the CSI-RS and / or CSI-IM resource in the corresponding resource set for interference measurement no later than the CSI reference resource and within the active period (s) of the cell discontinuous transmission (DTX) , when cell DTX is configured, and drops the report otherwise.
[0066] In some aspects, for the CSI report including multiple CSIs, after the CSI report (re) configuration, serving cell activation, BWP change, or activation of SP-CSI, the UE reports a CSI report (or a CSI in a CSI report) only after receiving at least one CSI-RS transmission occasion for each of the CSI-RS resources in the corresponding CSI-RS resource set for channel measurement and one CSI-RS and / or CSI-IM resource transmission occasion for the CSI-RS and / or CSI-IM resource in the corresponding resource set for interference measurement no later than the CSI reference resource and within the same discontinuous reception (DRX) active time (when DRX is configured) and active period (s) of the cell DTX (when cell DTX is configured) , and drops the report otherwise.
[0067] In some aspects, the network entity 104 and / or the UE 102 may determine the minimum processing delay for the CSI report including multiple CSIs based on at least one of the following factors: the number of CSI-RS resources for the channel measurement (K) ; the codebook configuration for each CSI-RS resource; the number of reported CSIs (N) ; the frequency granularity for the CSI report; and / or the UE capability for the minimum processing delay.
[0068] In some aspects, the UE 102 calculates the CSIs for all the configured CSI-RS resources in the CSI-RS resource set for channel measurement one by one. Then the minimum processing delay (Z, Z’) may be determined by (xKZm, xKZm’) , where x may be predefined or reported by the UE capability. The network entity 104 and / or the UE 102 may determine the value of (Zm, Zm’) based on the minimum processing delay for one CSI measurement. In one example, (Zm, Zm’) is based on (Z1, Z1’) , (Z2, Z2’) or (Z3, Z3’) as defined in 3GPP TS 38.214 section 5.4. In another example, (Zm, Zm’) is pre-defined or reported by the UE capability.
[0069] In some aspects, the UE 102 measures the beam quality for all the configured CSI-RS resources in the CSI-RS resource set for channel measurement one by one and the CSI for the top N CSI-RS resources with the best beam quality. Then the minimum processing delay (Z, Z’) may be determined by (xNZm+yKZn, xNZm’ +yKZn’) , where y may be predefined or reported by the UE capability. In one example, (Zn, Zn’) is based on (Z1, Z1’) , (Z2, Z2’) or (Z3, Z3’) as defined in 3GPP TS 38.214 section 5.4. In another example, (Zn, Zn’) is pre-defined or reported by the UE capability. In another example, (Zn, Zn’) is pre-defined as 0.
[0070] In some aspects, the UE 102 calculates the CSIs for some or all the configured CSI-RS resources in the CSI-RS resource set for channel measurement in parallel. Then the minimum processing delay (Z, Z’) may be determined by (xZm, xZm’) .
[0071] In some aspects, the network entity 104 and / or the UE 102 may determine the number of CPUs for the CSI report including multiple CSIs based on at least one of the following factors: the number of CSI-RS resources for the channel measurement (K) ; the number of reported CSIs (N) ; the frequency granularity for the CSI report; the UE capability for the number of CPUs. In some aspects, the UE 102 calculates the CSIs one by one. Then the number of CPUs is 1.
[0072] In some aspects, the UE 102 calculates some or all the CSIs for all the configured CSI-RS resources for channel measurement in parallel. Then the number of CPUs is x’K, where x’ is reported by the UE capability or predefined (e.g., x’ =1, or configured by the network entity) .
[0073] In some aspects, the UE 102 calculates some or all the CSIs for the CSI-RS resources for channel measurement in parallel. The UE 102 may use additional CPUs for the CSI-RS resource selection for the CSI report. Then the number of CPUs is x’N+y’K, where y’ is reported by the UE capability or predefined (e.g., y’ =1 or y’ =0, or configured by the network entity) . In some aspects, the total number of CPUs is no more than the maximum number of CPUs (e.g., 8) .
[0074] In some aspects, the network entity 104 may pair 312 the UE 102 with another UE for transmitting downlink communications (e.g., PUSCH communications) . For example, the network entity 104 may receive, from another UE, a second CSI report including a plurality of second CSIs. The network entity 104 may pair 312, based on the CSI report received from the UE 102 and the second CSI report received from the other UE, the UE 102 with the second UE. After pairing 312 the UE 102 with the second UE, the network entity 104 may transmit, to the UE 102 using a first beam, a first downlink communication (e.g., PUSCH communication) and transmit, to the second UE using a second beam, a second downlink communication (e.g., PUSCH communication) .
[0075] FIG. 4A illustrates a diagram 400a of a CSI report 411 based on a number of reported CSIs 413 according to an embodiment. In some aspects, the network entity configures K CSI-RS resources (e.g., four CSI-RS resources 405a, 405b, 405c, and 405d) in the CSI-RS resource set 403 for channel measurement. The UE reports K CSIs (e.g., four CSIs 413a, 413b, 413c, and 413d) , where each reported CSI 413a, 413b, 413c, and 413d corresponds to each CSI-RS resource 405a, 405b, 405c, and 405d, respectively, in the CSI-RS resource set 403 for channel measurement. If the network entity configures multiple CSI-RS resource sets 403 where CSI-RS resource set s includes Ks CSI-RS resources, the UE reports Kj CSIs 413 if the CSI-RS resource set j is triggered (e.g., via DCI) for the CSI report 411. In some aspects, the UE may not report the CRI in the CSI report 411. In some aspects, the network entity may configure a parameter enabling multiple CSI reports in the CSI report configuration for the CSI report 411. In some aspects, the network entity may configure the UE to report one or more of the CSI components: RI, CQI, PMI, wideband precoder information, and / or layer indicator (LI) by the report quantity in the CSI report configuration for CSI report 411. Thus, if the UE receives the configuration configuring the UE to report CRI, the UE may report one CSI based on one of the CSI-RS resources for channel measurement. Otherwise, the UE may report CSIs for all the CSI-RS resources in the CSI-RS resource set for channel measurement.
[0076] FIG. 4B illustrates a diagram 400b of a CSI report 411 based on a number of reported CSIs 413 according to another embodiment. In some aspects, the network entity configures K CSI-RS resources 405 (e.g., four CSI-RS resources 405a, 405b, 405c, and 405d) in the CSI-RS resource set 403 for channel measurement. The network entity configures the UE to report N (N<=K) CSIs 413 from the CSI-RS resources 405. The network entity may configure the number of reported CSIs 413 by RRC signaling, MAC CE, or DCI. In some aspects, the network entity configures the number of reported CSIs 413 by a parameter in the CSI report 411 configuration (e.g., CSI-ReportConfig) . In some aspects, the network entity configures the number of reported CSIs 413 by a MAC CE activating a semi-persistent CSI report. In some aspects, the network entity configures the number of reported CSIs 413 by the DCI triggering the aperiodic CSI report.
[0077] In some aspects, the UE reports N CSIs 413, where each reported CSI 413 corresponds to one CSI-RS resource 405 in the CSI-RS resource set 403 for channel measurement. For example, in the non-limiting example of FIG. 4B, the UE reports CSI 413a corresponding to CSI-RS resource 405a and CSI 413c corresponding to CSI-RS resource 405c. In some aspects, the UE reports N CRIs indicating the CSI-RS resource index (es) for the reported CSIs 413. In some aspects, the UE reports a CRI bitmap, where bit x indicates whether the CSI 413 corresponding to the CSI-RS resource x 405 for the CSI-RS resource set 403 is reported. For example, as shown in FIG. 4B, the CRI bitmap of 1010 (CRI = 1010) indicates the UE reports the first and third CSIs which are CSI 413a and CSI 413c respectively. The UE may select the CSIs 413 to be reported based on the measured beam quality for each CSI-RS resource 405.
[0078] FIG. 4C illustrates a diagram 400c of a CSI report 411 based on a number of reported CSIs 413 according to another embodiment. In some aspects, the network entity may configure a CRI restriction for the CSI report 411 by RRC signaling, MAC CE, or DCI. In one example, the CRI restriction indicates at least one CRI that the UE includes in the CSI report 411. For example, as show in FIG. 4C, the network entity always requires the UE to report CSI 413a for CSI-RS resource 405a. In another example, the CRI restriction indicates the candidate CRI combinations and the UE reports the CRIs based on one of the configured candidate CRI combinations. In some aspects, the UE reports a CRI bitmap, where bit x indicates whether the CSI corresponding to the CSI-RS resource x for the CSI-RS resource set 403 is reported. For example, as shown in FIG. 4C, the CRI bitmap of 1xxx indicates the UE always reports the first CSI 413a and optionally reports CSI 413b, 413c, or 413d based on the state of the second, third, and fourth bit of the CRI bitmap. Here, the CRI bitmap of 1001 indicates that the first and fourth CSIs are reported which are CSI 413a and CSI 413d respectively.
[0079] FIG. 4D illustrates a diagram 400d of a CSI report 411 based on a number of reported CSIs 413 according to another embodiment. In some aspects, the network entity configures K CSI-RS resources 405 (e.g., four CSI-RS resources 405a, 405b, 405c, and 405d) in the CSI-RS resource set 403 for channel measurement. The network entity configures the UE to report N (N<=K) CSIs 413 from the CSI-RS resources 405. The UE may report the value of N in the CSI report 411. In some aspects, the UE may report the value of N in CSI part 1.
[0080] In one example, the UE reports the value of N based on a dedicated component in the CSI report 411. In another example, the UE reports the value of N based on the reported CRIs. The UE reports a CRI bitmap, where bit x indicates whether the CSI 413 corresponding to the CSI-RS resource x 405 for the CSI-RS resource set 403 is reported. Here, the CSI report 411 indicates 2 CSIs reported (CSI=2) and / or CRI bitmap = 1010 which indicates CSI 413a corresponding to CSI resource 405a and CSI 413c correspond to CSI resource 405c are reported.
[0081] In some aspects, the network entity may configure a minimum number of reported CSIs 413 and / or a maximum number of reported CSIs 413 for the CSI report 411. The network entity may provide the configuration by RRC signaling, MAC CE, or DCI. In some aspects, the network entity may configure a CRI restriction for the CSI report 411. In one example, the CRI restriction indicates at least one CRI that the UE should report. For example, the network entity may always require the UE to report the CSI 413a for CSI-RS resource 405a. In another example, the CRI restriction indicates the candidate CRIs combinations, and the UE reports the CRIs based on one of the configured candidate CRIs combinations.
[0082] FIG. 4E illustrates a diagram 400e of a CSI report 411 based on a number of reported CSIs 413 according to another embodiment. In some aspects, the network entity configures K CSI-RS resources 405 (e.g., four CSI-RS resources 405a, 405b, 405c, and 405d) in the CSI-RS resource set 403 for channel measurement. The network entity configures the UE to report L (L<=K) CSIs 413 from the CSI-RS resources 405 in each CSI report occasion 411. The UE may report different CSIs 413 in different report occasions 411. For example, as shown in FIG. 4E, the UE may report CSI 413a and CSI 413b in CSI report occasion 411a. The UE may report CSI 413c and CSI 413d in CSI report occasion 411b. The value of L may be predefined or configured by the network entity. The reported CSIs 413 for each CSI report occasion 411 may be configured by the network entity or determined based on the timing information for the CSI report occasion 411 (e.g., symbol / slot / subframe / frame / occasion index) and / or the CSI-RS resource 405 index.
[0083] FIGs. 2A, 2B, 3, and 4A-4E illustrate multiple CSI feedback for MU-MIMO pairing. FIGs. 5 and 6 show methods for implementing one or more aspects of FIGs. 2A, 2B, 3, and 4A-4E. In particular, FIG. 5 shows an implementation by the UE 102 of one or more aspects of FIGs. 2A, 2B, 3, and 4A-4E. FIG. 6 shows an implementation by the network entity 104 of one or more aspects of FIGs. 2A, 2B, 3, and 4A-4E.
[0084] FIG. 5 illustrates a flowchart 500 of a method of wireless communication at a UE. With reference to FIGs. 1, 2A, 2B, 3, and 4A-4E, the method may be performed by the UE 102. In embodiments, the UE 102 optionally transmits 502, to a network entity, a UE capability on a supported configuration for a CSI report including a plurality of CSIs. For example, referring to FIG. 3, the UE 102 optionally transmits 302, to a network entity 104, a UE capability on a supported configuration for a CSI report including a plurality of CSIs.
[0085] The UE receives 504, from the network entity, a control signaling configuring a CSI report configuration including a plurality of CSI-RS resources for channel measurement, a codebook configuration, and a parameter indicating the UE to report a plurality of CSIs. For example, referring to FIG. 3, the UE 102 receives 304 control signaling configuring a CSI report configuration including a plurality of CSI-RS resources for channel measurement, at least one codebook configuration, and a parameter configuring the CSI report including a plurality of CSIs.
[0086] The UE optionally receives 506, from the network entity, a control signaling triggering the CSI report and the plurality CSI-RS resources for channel measurement. For example, referring to FIG. 3, the UE 102 optionally receives 306, from the network entity 104, a MAC CE or DCI triggering the configured CSI report and / or the plurality of CSI-RS resources for channel measurement.
[0087] The UE receives 508, from the network entity, a plurality of CSI-RSs on the plurality of CSI-RS resources. For example, referring to FIG. 3, the UE 102 receives 308, from the network entity, CSI-RSs on the plurality of CSI-RS resources.
[0088] The UE transmits 510, to the network entity, a CSI report including the plurality of CSIs measured from the plurality of CSI-RSs based on the CSI report configuration. For example, referring to FIG. 3, the UE 102 transmits 310, to the network entity 104, a CSI report including the plurality of CSIs measured from the plurality of CSI-RSs based on the CSI report configuration. FIG. 5 describes a method from a UE-side of a wireless communication link, whereas FIG. 6 describes a method from a network-side of the wireless communication link.
[0089] FIG. 6 is a flowchart 600 of a method of wireless communication at a network entity. With reference to FIGs. 1, 2A, 2B, 3, and 4A-4E, 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. In embodiments, the network entity optionally receives 602, from a UE, a UE capability on a supported configuration for a CSI report including a plurality of CSIs. For example, referring to FIG. 3, the network entity 104 optionally receives 302, from a UE 102, a UE capability on a supported configuration for a CSI report including a plurality of CSIs.
[0090] The network entity transmits 604, to the UE, a control signaling configuring a CSI report configuration including a plurality of CSI-RS resources for channel measurement, a codebook configuration, and a parameter indicating the UE to report a plurality of CSIs. For example, referring to FIG. 3, the network entity 104 transmits 304, to the UE 102, control signaling configuring a CSI report configuration including a plurality of CSI-RS resources for channel measurement, at least one codebook configuration, and a parameter configuring the CSI report including a plurality of CSIs.
[0091] The network entity optionally transmits 606, to the UE, a control signaling triggering the CSI report and the plurality CSI-RS resources for channel measurement. For example, referring to FIG. 3, the network entity 104 optionally transmits 306, to the UE 102, a MAC CE or DCI triggering the configured CSI report and / or the plurality of CSI-RS resources for channel measurement.
[0092] The network entity transmits 608, to the UE, a plurality of CSI-RSs on the plurality of CSI-RS resources. For example, referring to FIG. 3, the network entity 104 transmits 308, to the UE 102, CSI-RSs on the plurality of CSI-RS resources.
[0093] The network entity receives 610, from the UE, a CSI report including the plurality of CSIs measured from the plurality of CSI-RSs based on the CSI report configuration. For example, referring to FIG. 3, the network entity receives 310, from the UE 102, a CSI report including the plurality of CSIs measured from the plurality of CSI-RSs based on the CSI report configuration.
[0094] The network entity optionally pairs 612, based on the CSI report, the UE 102 with another UE for transmitting downlink communications. For example, referring to FIG. 3, the network entity 104 optionally pairs 312, based on the CSI report, the UE 102 with another UE for transmitting downlink communications. A UE apparatus 702, as described in FIG. 7, may perform the method of flowchart 500. The one or more network entities 104, as described in FIG. 8, may perform the method of flowchart 600.
[0095] FIG. 7 is a diagram 700 illustrating an example of a hardware implementation for a UE apparatus 702. The UE apparatus 702 may be the UE 102, a component of the UE 102, or may implement UE functionality. The UE apparatus 702 may include an application processor 706, which may have on-chip memory 706’ . In examples, the application processor 706 may be coupled to a secure digital (SD) card 708 and / or a display 710. The application processor 706 may also be coupled to a sensor (s) module 712, a power supply 714, an additional module of memory 716, a camera 718, and / or other related components.
[0096] The UE apparatus 702 may further include a wireless baseband processor 726, which may be referred to as a modem. The wireless baseband processor 726 may have on-chip memory 726'. Along with, and similar to, the application processor 706, the wireless baseband processor 726 may also be coupled to the sensor (s) module 712, the power supply 714, the additional module of memory 716, the camera 718, and / or other related components. The wireless baseband processor 726 may be additionally coupled to one or more subscriber identity module (SIM) card (s) 720 and / or one or more transceivers 730 (e.g., wireless RF transceivers) .
[0097] Within the one or more transceivers 730, the UE apparatus 702 may include a Bluetooth module 732, a WLAN module 734, an SPS module 736 (e.g., GNSS module) , and / or a cellular module 738. The Bluetooth module 732, the WLAN module 734, the SPS module 736, and the cellular module 738 may each include an on-chip transceiver (TRX) , or in some cases, just a transmitter (TX) or just a receiver (RX) . The Bluetooth module 732, the WLAN module 734, the SPS module 736, and the cellular module 738 may each include dedicated antennas and / or utilize antennas 740 for communication with one or more other nodes. For example, the UE apparatus 702 can communicate through the transceiver (s) 730 via the antennas 740 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.
[0098] The wireless baseband processor 726 and the application processor 706 may each include a computer-readable medium / memory 726', 706', respectively. The additional module of memory 716 may also be considered a computer-readable medium / memory. Each computer-readable medium / memory 726', 706', 716 may be non-transitory. The wireless baseband processor 726 and the application processor 706 may each be responsible for general processing, including execution of software stored on the computer-readable medium / memory 726', 706', 716. The software, when executed by the wireless baseband processor 726 / application processor 706, causes the wireless baseband processor 726 / application processor 706 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 726 / application processor 706 when executing the software. The wireless baseband processor 726 / application processor 706 may be a component of the UE 102. The UE apparatus 702 may be a processor chip (e.g., modem and / or application) and include just the wireless baseband processor 726 and / or the application processor 706. In other examples, the UE apparatus 702 may be the entire UE 102 and include the additional modules of the apparatus 702.
[0099] As discussed in FIG. 1 and implemented with respect to FIG. 5, the multi-CSI component 140 is configured to receive, from a network entity, a CSI report configuration indicating a plurality of CSI-RS resources for channel measurement, a codebook configuration, and a reporting parameter for a CSI report to include a plurality of CSIs. The multi-CSI component 140 is further configured to receive, from the network entity, a plurality of CSI-RSs on the plurality of CSI-RS resources. The multi-CSI component 140 is further configured to transmit, to the network entity, the CSI report including the plurality of CSIs measured from the plurality of CSI-RSs based on the CSI report configuration.
[0100] The multi-CSI component 140 may be within the application processor 706 (e.g., at 140a) , the wireless baseband processor 726 (e.g., at 140b) , or both the application processor 706 and the wireless baseband processor 726. The multi-CSI 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.
[0101] FIG. 8 is a diagram 800 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 846, which may have on-chip memory 846'. In some aspects, the CU 110 may further include an additional module of memory 856 and / or a communications interface 848, both of which may be coupled to the CU processor 846. The CU 110 can communicate with the DU 108 through a midhaul link 162, such as an F1 interface between the communications interface 848 of the CU 110 and a communications interface 828 of the DU 108.
[0102] The DU 108 may include a DU processor 826, which may have on-chip memory 826'. In some aspects, the DU 108 may further include an additional module of memory 836 and / or the communications interface 828, both of which may be coupled to the DU processor 826. The DU 108 can communicate with the RU 106 through a fronthaul link 160 between the communications interface 828 of the DU 108 and a communications interface 808 of the RU 106.
[0103] The RU 106 may include an RU processor 806, which may have on-chip memory 806'. In some aspects, the RU 106 may further include an additional module of memory 816, the communications interface 808, and one or more transceivers 830, all of which may be coupled to the RU processor 806. The RU 106 may further include antennas 840, which may be coupled to the one or more transceivers 830, such that the RU 106 can communicate through the one or more transceivers 830 via the antennas 840 with the UE 102.
[0104] The on-chip memory 806', 826', 846'a nd the additional modules of memory 816, 836, 856 may each be considered a computer-readable medium / memory. Each computer-readable medium / memory may be non-transitory. Each of the processors 806, 826, 846 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) 806, 826, 846 causes the processor (s) 806, 826, 846 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) 806, 826, 846 when executing the software. In examples, the multi-CSI 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.
[0105] As discussed in FIG. 1 and implemented with respect to FIG. 6, the multi-CSI configuration component 150 is configured to transmit, to a UE, a CSI report configuration indicating a plurality of CSI-RS resources for channel measurement, a codebook configuration, and a reporting parameter for a CSI report to include a plurality of CSIs. The multi-CSI configuration component 150 is further configured to transmit, to the UE, a plurality of CSI-RSs on the plurality of CSI-RS resources. The multi-CSI configuration component 150 is further configured to receive, from the UE, the CSI report including the plurality of CSIs measured from the plurality of CSI-RSs based on the CSI report configuration.
[0106] The multi-CSI configuration component 150 may be within one or more processors of the one or more network entities 104, such as the RU processor 806 (e.g., at 150a) , the DU processor 826 (e.g., at 150b) , and / or the CU processor 846 (e.g., at 150c) . The multi-CSI 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 806, 826, 846 configured to perform the stated processes / algorithm, stored within a computer-readable medium for implementation by the one or more processors 806, 826, 846, or a combination thereof.
[0107] 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.
[0108] 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.
[0109] 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.
[0110] 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.
[0111] 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.
[0112] 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.
[0113] 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.
[0114] 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.
[0115] 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.
[0116] 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” .
[0117] 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.
[0118] 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.
[0119] 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.
[0120] The following examples are illustrative only and may be combined with other examples or teachings described herein, without limitation.
[0121] Example 1 is a method of wireless communication at a UE, comprising receiving, from a network entity, a CSI report configuration indicating: a plurality of CSI-RS resources for channel measurement; a codebook configuration; and a reporting parameter for a CSI report to include a plurality of CSIs; receiving, from the network entity, a plurality of CSI-RSs on the plurality of CSI-RS resources for channel measurement; and transmitting, to the network entity, the CSI report including the plurality of CSIs measured from the plurality of CSI-RSs based on the CSI report configuration.
[0122] Example 2 may be combined with Example 1 and includes the CSI report configuration further indicates at least one of: a second plurality of CSI-RS resources for interference measurement; a plurality of CSI-IM resources for interference measurement; frequency granularity for the CSI report; codebook subset restriction; or rank restriction.
[0123] Example 3 may be combined with any of Examples 1-2 and further includes transmitting, to the network entity, a UE capability message indicating at least one of: whether the UE supports the CSI report including the plurality of CSIs; a maximum number of the plurality of CSIs; a maximum number of the plurality of CSI-RS resources for channel measurement; a maximum number of antenna ports across the plurality of CSI-RS resources for channel measurement; a supported time-domain behavior for the plurality of CSI-RS resources for channel measurement; a supported time-domain behavior for the CSI report; or a supported codebook type for the CSI report with the plurality of CSIs.
[0124] Example 4 may be combined with any of Examples 1-3 and further includes the CSI report configuration further indicates, for each of the plurality of CSI-RS resources for channel measurement, a same value for at least one of: a bandwidth; subcarriers; a time domain behavior; a periodicity; a number of antenna ports; an EPRE ratio between a PDSCH and a CSI-RS; an EPRE ratio between the CSI-RS and a secondary synchronization signal; or a scrambling identifier.
[0125] Example 5 may be combined with any of Examples 1-4 and further includes the CSI report configuration further indicates, for each of the plurality of CSI-RS resources for channel measurement, at least one of: a codebook configuration; a codebook subset restriction; a rank indicator (RI) restriction; or a report quantity configuration.
[0126] Example 6 may be combined with any of Examples 1-5 and further includes each CSI of the plurality of CSIs corresponds to one of the plurality of CSI-RS resources for channel measurement.
[0127] Example 7 may be combined with any of Examples 1-6 and further includes the CSI report configuration further indicates a configuration of a CRI restriction for the CSI report.
[0128] Example 8 may be combined with any of Examples 1-7 and further includes transmitting, to the network entity, the CSI report comprises transmitting, to the network entity, the CSI report for each of the plurality of CSIs including at least one of: a CRI; an RI; a PMI; a CQI; a LI; wideband precoder information.
[0129] Example 9 may be combined with any of Examples 1-8 and further includes transmitting, to the network entity, the CSI report including comprises transmitting, to the network entity, the CSI report including the plurality of CSIs based on receiving at least one transmission occasion for each of the plurality of CSI-RS resources for channel measurement within a time window.
[0130] Example 10 may be combined with any of Examples 1-9 and further includes a minimum processing delay for the CSI report is based on at least one of: a number of the plurality of CSI-RS resources for channel measurement; a codebook configuration for each of the plurality of CSI-RS resources for channel measurement; a number of reported CSIs; a frequency granularity for the CSI report; or a UE capability for the minimum processing delay.
[0131] Example 11 may be combined with any of Examples 1-10 and further includes receiving, from the network entity, a control signaling triggering the CSI report and the plurality CSI-RS resources for channel measurement.
[0132] Example 12 is a method of wireless communication at a network entity and includes transmitting, to a first UE, a CSI report configuration indicating: a plurality of CSI-RS resources for channel measurement; a codebook configuration; and a reporting parameter for a first CSI report to include a plurality of CSIs; transmitting, to the first UE, a plurality of CSI-RSs on the plurality of CSI-RS resources for channel measurement; and receiving, from the first UE, the first CSI report including the plurality of CSIs measured from the plurality of CSI-RSs based on the CSI report configuration.
[0133] Example 13 may be combined with Example 12 and further includes receiving, from a second UE, a second CSI report including a plurality of second CSIs; pairing, based on the first CSI report and the second CSI report, the first UE with the second UE; transmitting, to the first UE using a first beam, a first downlink communication; and transmitting, to the second UE using a second beam, a second downlink communication.
[0134] Example 14 may be combined with any of Examples 12-13 and further includes the transmitting the plurality of CSI-RSs comprises: transmitting, to the first UE, a first CSI-RS using a first spatial domain filter and a second CSI-RS using a second spatial domain filter different from the first spatial domain filter.
[0135] Example 15 may be combined with any of Examples 12-14 and further includes the CSI report configuration further includes a second plurality of CSI-RS resources for interference measurement, a plurality of CSI-IM resources for interference measurement, at least one frequency granularity for the CSI report, at least one codebook subset restriction, or at least one rank restriction.
[0136] Example 16 may be combined with any of Examples 12-15 and further includes receiving, from the UE, a UE capability message indicating at least one of: whether the UE supports the CSI report including the plurality of CSIs; a maximum number of the plurality of CSIs; a maximum number of the plurality of CSI-RS resources for channel measurement; a maximum number of antenna ports across the plurality of CSI-RS resources for channel measurement; a supported time-domain behavior for the plurality of CSI-RS resources for channel measurement; a supported time-domain behavior for the CSI report; or a supported codebook type for the CSI report with the plurality of CSIs.
[0137] Example 17 may be combined with any of Examples 12-16 and further includes the CSI report configuration comprises: for each CSI-RS in a CSI-RS resource set of the plurality of CSI-RS resources for channel measurement, configuring a same value for at least one of: a bandwidth; subcarriers; a time domain behavior; a periodicity; a number of antenna ports; an EPRE ratio between physical downlink shared channel (PDSCH) and a CSI-RS; an EPRE ratio between the CSI-RS and secondary synchronization signal; or a scrambling identifier.
[0138] Example 18 may be combined with any of Examples 12-17 and further includes the CSI report configuration indicates at least one of: the codebook configuration; a codebook subset restriction; a RI restriction; or a report quantity configuration; wherein each of the plurality of configuration corresponding to one of the plurality of CSI-RS resources for channel measurement, and wherein the plurality of configuration have a same value.
[0139] Example 19 may be combined with any of Examples 12-18 and further includes a number of the plurality of CSIs is based on a number of the plurality of CSI-RS resources for channel measurement, or configured by the network entity.
[0140] Example 20 may be combined with any of Examples 12-19 and further includes the CSI report configuration further includes a configuration of a CRI restriction for the CSI report.
[0141] Example 21 may be combined with any of Examples 12-20 and further includes the receiving, from the UE, the CSI report comprises: receiving, from the UE, the CSI report, for each of the plurality of CSIs, including at least one of: a CRI; an RI; a PMI; a CQI; a LI; wideband precoder information.
[0142] Example 22 may be combined with any of Examples 12-21 and further includes the receiving, from the UE, the CSI report comprises: receiving, from the UE, the CSI report including the plurality of CSIs based on receiving at least one transmission occasion for each of the plurality of CSI-RS resources for channel measurement within a time window.
[0143] Example 23 may be combined with any of Examples 12-22 and further includes a minimum processing delay for the CSI report is based on at least one of: a number of the plurality of CSI-RS resources for channel measurement; a codebook configuration for each of the plurality of CSI-RS resources for channel measurement; a number of reported CSIs; a frequency granularity for the CSI report; or a UE capability for the minimum processing delay.
[0144] Example 24 may be combined with any of Examples 12-23 and further includes transmitting, to the UE, a control signaling triggering the CSI report and the plurality CSI-RS resources for channel measurement.
[0145] Example 25 is an apparatus for wireless communication for implementing a method as in any of Examples 1-24.
[0146] Example 26 is an apparatus for wireless communication including means for implementing a method as in any of Examples 1-24.
[0147] Example 27 is a non-transitory computer-readable medium storing computer executable code, the code when executed by a processor causes the processor to implement a method as in any of Examples 1-24.
Claims
1.A method of wireless communication at a user equipment (UE) (102) , comprising:receiving (304) , from a network entity (104) , a channel state information (CSI) report configuration indicating:a plurality of CSI reference signal (CSI-RS) resources for channel measurement;a codebook configuration; anda reporting parameter for a CSI report to include a plurality of CSIs;receiving (308) , from the network entity (104) , a plurality of CSI-RSs on the plurality of CSI-RS resources for channel measurement; andtransmitting (310) , to the network entity (104) , the CSI report including the plurality of CSIs measured from the plurality of CSI-RSs based on the CSI report configuration.2.The method of claim 1, wherein the CSI report configuration further indicates at least one of:a second plurality of CSI-RS resources for interference measurement;a plurality of CSI interference measurement (CSI-IM) resources for interference measurement;frequency granularity for the CSI report;codebook subset restriction; orrank restriction.3.The method of any of claims 1-2, further comprising:transmitting (302) , to the network entity (104) , a UE capability message indicating at least one of:whether the UE (102) supports the CSI report including the plurality of CSIs;a maximum number of the plurality of CSIs;a maximum number of the plurality of CSI-RS resources for channelmeasurement;a maximum number of antenna ports across the plurality of CSI-RS resources for channel measurement;a supported time-domain behavior for the plurality of CSI-RS resources for channel measurement;a supported time-domain behavior for the CSI report; ora supported codebook type for the CSI report with the plurality of CSIs.4.The method of any of claims 1-3, wherein the CSI report configuration further indicates, for each of the plurality of CSI-RS resources for channel measurement, a same value for at least one of:a bandwidth;subcarriers;a time domain behavior;a periodicity;a number of antenna ports;an energy per resource element (EPRE) ratio between physical downlink shared channel (PDSCH) and a CSI-RS;an EPRE ratio between the CSI-RS and a secondary synchronization signal; ora scrambling identifier.5.The method of any of claims 1-4, wherein the CSI report configuration further indicates, for each of the plurality of CSI-RS resources for channel measurement, at least one of:a codebook configuration;a codebook subset restriction;a rank indicator (RI) restriction; ora report quantity configuration.6.The method of any of claims 1-5, wherein each CSI of the plurality of CSIs corresponds to one of the plurality of CSI-RS resources for channel measurement.7.The method of any of claims 1-6, wherein the CSI report configuration further indicates a configuration of a CSI-RS resource indicator (CRI) restriction for the CSI report.8.The method of any of claims 1-7, wherein the transmitting (310) , to the network entity (104) , the CSI report comprises transmitting (310) , to the network entity (104) , the CSI report for each of the plurality of CSIs including at least one of:a CRI;an RI;a precoder matrix indicator (PMI) ;a channel quality indicator (CQI) ;a layer indicator (LI) ;wideband precoder information.9.The method of any of claims 1-8, wherein the transmitting (310) , to the network entity (104) , the CSI report including comprises transmitting (310) , to the network entity (104) , the CSI report including the plurality of CSIs based on receiving (308) at least one transmission occasion for each of the plurality of CSI-RS resources for channel measurement within a time window.10.The method of any of claims 1-9, wherein a minimum processing delay for the CSI report is based on at least one of:a number of the plurality of CSI-RS resources for channel measurement;a codebook configuration for each of the plurality of CSI-RS resources for channel measurement;a number of reported CSIs;a frequency granularity for the CSI report; ora UE capability for the minimum processing delay.11.The method of any of claims 1-10, further comprising:receiving (306) , from the network entity (104) , a control signaling triggering the CSI report and the plurality CSI-RS resources for channel measurement.12.A method of wireless communication at a network entity (104) , comprising:transmitting (304) , to a first user equipment (UE) (102) , a channel state information (CSI) report configuration indicating:a plurality of CSI reference signal (CSI-RS) resources for channel measurement;a codebook configuration; anda reporting parameter for a first CSI report to include a plurality of first CSIs;transmitting (308) , to the first UE (102) , a plurality of CSI-RSs on the plurality of CSI-RS resources for channel measurement; andreceiving (310) , from the first UE (102) , the first CSI report including the plurality of first CSIs measured from the plurality of CSI-RSs based on the CSI report configuration.13.The method of claim 12, further comprising:receiving (310) , from a second UE (102) , a second CSI report including a plurality of second CSIs;pairing (312) , based on the first CSI report and the second CSI report, the first UE (102) with the second UE (102) ;transmitting, to the first UE (102) using a first beam, a first downlink communication; andtransmitting, to the second UE using a second beam, a second downlink communication.14.The method of any of claims 12 to 13, wherein the transmitting (308) the plurality of CSI-RSs comprises:transmitting (308) , to the first UE (102) , a first CSI-RS using a first spatial domain filter and a second CSI-RS using a second spatial domain filter different from the first spatial domain filter.15.The method of any of claims 12-14, further comprising:transmitting (306) , to the UE (102) , a control signaling triggering the CSI report including the plurality of CSIs.16.An apparatus for wireless communication comprising a transceiver, a memory, and a processor coupled to the memory and the transceiver, the apparatus being configured to implement a method as in any of claims 1-15.
Citation Information
Patent Citations
Method and apparatus for downlink and uplink CSI acquisition
US20200076490A1
Doppler-delay codebook-based precoding and CSI reporting wireless communications systems
US20210143885A1