Patent Publication Number: US-2021194545-A1

Title: System and method for determination of metrics for multiple-input multiple-output communication

Description:
CROSS REFERENCE TO RELATED APPLICATION(S) 
     This application claims the benefit of U.S. Provisional Ser. No. 62/951,980, entitled “SYSTEM AND METHOD FOR DETERMINATION OF METRICS FOR MULTIPLE-INPUT MULTIPLE-OUTPUT COMMUNICATION” and filed on Dec. 20, 2019, the disclosure of which is expressly incorporated by reference herein in its entirety. 
    
    
     BACKGROUND 
     Technical Field 
     The present disclosure relates generally to communication systems, and more particularly, to a user equipment configured to report a metric associated with multiple-input multiple-output communication to a base station. 
     Introduction 
     Wireless communication systems are widely deployed to provide various telecommunication services such as telephony, video, data, messaging, and broadcasts. Typical wireless communication systems may employ multiple-access technologies capable of supporting communication with multiple users by sharing available system resources. Examples of such multiple-access technologies include code division multiple access (CDMA) systems, time division multiple access (TDMA) systems, frequency division multiple access (FDMA) systems, orthogonal frequency division multiple access (OFDMA) systems, single-carrier frequency division multiple access (SC-FDMA) systems, and time division synchronous code division multiple access (TD-SCDMA) systems. 
     These multiple access technologies have been adopted in various telecommunication standards to provide a common protocol that enables different wireless devices to communicate on a municipal, national, regional, and even global level. An example telecommunication standard is 5G New Radio (NR). 5G NR is part of a continuous mobile broadband evolution promulgated by Third Generation Partnership Project (3GPP) to meet new requirements associated with latency, reliability, security, scalability (e.g., with Internet of Things (IoT)), and other requirements. 5G NR includes services associated with enhanced mobile broadband (eMBB), massive machine-type communications (mMTC), and ultra-reliable low-latency communications (URLLC). Some aspects of 5G NR may be based on the 4G Long Term Evolution (LTE) standard. There exists a need for further improvements in 5G NR technology. These improvements may also be applicable to other multi-access technologies and the telecommunication standards that employ these technologies. 
     SUMMARY 
     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, and is intended to neither identify key or critical elements of all aspects nor delineate 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. 
     According to some example access networks, a user equipment (UE) may be configured for group-based beam reporting. When configured for group-based beam reporting, the UE may simultaneously receive two reference and/or synchronization signals on two sets of resources either with a single spatial domain receive filter or with multiple simultaneous spatial domain receive filters. The UE may be configured to report, in one reporting instance, either a reference signal received power (RSRP) or a signal-to-interference-plus-noise ratio (SINR) for each of the two reference and/or synchronization signals in response to receiving the two reference and/or synchronization signals on the two sets of resources. 
     In such example access networks, however, a procedure for reporting other metrics for reference and/or synchronization signals carried on one or more sets of resources may be absent. For example, some access networks may not support dynamic reporting of other metrics and/or joint quantities of a metric associated with reference and/or synchronization signals carried on simultaneously received sets of resources. Consequently, group-based beam reporting configured for a UE may be based on heuristics and/or based on UE implementation, and therefore, may lack adequate information regarding joint channel properties for simultaneous transmission and reception on a channel configured with a base station. Therefore, a need exists for solutions to reporting metrics related to joint channel properties. 
     In view of the foregoing, the present disclosure provides some approaches and solutions that support various feedback metrics for resource grouping in association with transmission and reception operation modes and/or channel states, such as multiple-input multiple-output (MIMO) schemes, SINRs, channel properties, and the like. 
     In one aspect of the disclosure, a first method, a first computer-readable medium, and a first apparatus are provided. The first apparatus may be implemented in a UE. The first apparatus may determine a metric associated with MIMO communication with a base station based on at least one operational state associated with at least one channel configured with the base station. The first apparatus may determine at least one value of the metric based on at least one of a set of signals received from the base station on the at least one channel, the at least one value corresponding to at least one set of resources. Further, the first apparatus may transmit a report indicating the at least one value of the metric to the base station. 
     In another aspect of the disclosure, a second method, a second computer-readable medium, and a second apparatus are provided. The second apparatus may be implemented in a base station. The second apparatus may determine a metric associated with MIMO communication with a UE based on at least one operational state associated with at least one channel configured with the UE. The second apparatus may transmit information indicating the metric to the UE. The second apparatus may receive, from the UE, a report indicating at least one value of the metric based on at least one of a set of signals transmitted to the UE on the at least one channel, the at least one value corresponding to at least one set of resources. 
     To the accomplishment of the foregoing and related ends, the one or more aspects comprise the features hereinafter fully described and particularly pointed out in the claims. The following description and the annexed drawings set forth in detail certain illustrative features of the one or more aspects. These features are indicative, however, of but a few of the various ways in which the principles of various aspects may be employed, and this description is intended to include all such aspects and their equivalents. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         FIG. 1  is a diagram illustrating an example of a wireless communications system and an access network. 
         FIGS. 2A, 2B, 2C, and 2D  are diagrams illustrating examples of a first 5G/NR frame, DL channels within a 5G/NR subframe, a second 5G/NR frame, and UL channels within a 5G/NR subframe, respectively. 
         FIG. 3  is a diagram illustrating an example of a base station and user equipment (UE) in an access network. 
         FIG. 4  is a diagram illustrating an example access network including a UE and a base station. 
         FIG. 5  is a call flow diagram illustrating example operations by the UE and the base station in the access network. 
         FIG. 6  is a flowchart of a method of wireless communication by a UE. 
         FIG. 7  is a flowchart of a method of wireless communication by a base station. 
         FIG. 8  is a diagram illustrating an example of a hardware implementation for an example apparatus. 
         FIG. 9  is a diagram illustrating another example of a hardware implementation for another example apparatus. 
     
    
    
     DETAILED DESCRIPTION 
     The detailed description set forth below in connection with the appended drawings is intended as a description of various configurations and is not intended to 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 understanding of various concepts. However, it will be apparent to those skilled in the art that 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. 
     Several aspects of telecommunication systems will now be presented with reference to various apparatus and methods. These apparatus and methods will be described in the following detailed description and illustrated in the accompanying drawings by various blocks, components, circuits, processes, algorithms, etc. (collectively referred to as “elements”). These elements may be implemented using electronic hardware, computer software, or any combination thereof. Whether such elements are implemented as hardware or software depends upon the particular application and design constraints imposed on the overall system. 
     By way of example, 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 a chip (SoC), baseband processors, field programmable gate arrays (FPGAs), programmable logic devices (PLDs), state machines, gated logic, discrete hardware circuits, and other suitable hardware configured to perform the various functionality described throughout this disclosure. One or more processors in the processing system may execute software. 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, etc., whether referred to as software, firmware, middleware, microcode, hardware description language, or otherwise. 
     Accordingly, in one or more example embodiments, the functions described may be implemented in hardware, software, or any combination thereof. If implemented in software, the functions may be stored on or encoded as one or more instructions or code on a computer-readable medium. Computer-readable media includes computer storage media. Storage media may be any available media that can be accessed by a computer. By way of example, and not limitation, such computer-readable media can comprise 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 the aforementioned 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. 
       FIG. 1  is a diagram illustrating an example of a wireless communications system and an access network  100 . The wireless communications system (also referred to as a wireless wide area network (WWAN)) includes base stations  102 , UEs  104 , an Evolved Packet Core (EPC)  160 , and another core network  190  (e.g., a 5G Core (5GC)). The base stations  102  may include macrocells (high power cellular base station) and/or small cells (low power cellular base station). The macrocells include base stations. The small cells include femtocells, picocells, and microcells. 
     The base stations  102  configured for 4G LTE (collectively referred to as Evolved Universal Mobile Telecommunications System (UMTS) Terrestrial Radio Access Network (E-UTRAN)) may interface with the EPC  160  through first backhaul links  132  (e.g., S1 interface). The base stations  102  configured for 5G NR (collectively referred to as Next Generation RAN (NG-RAN)) may interface with core network  190  through second backhaul links  184 . In addition to other functions, the base stations  102  may perform one or more of the following functions: transfer of user data, radio channel ciphering and deciphering, integrity protection, header compression, mobility control functions (e.g., handover, dual connectivity), inter-cell interference coordination, connection setup and release, load balancing, distribution for non-access stratum (NAS) messages, NAS node selection, synchronization, radio access network (RAN) sharing, multimedia broadcast multicast service (MBMS), subscriber and equipment trace, RAN information management (RIM), paging, positioning, and delivery of warning messages. The base stations  102  may communicate directly or indirectly (e.g., through the EPC  160  or core network  190 ) with each other over third backhaul links  134  (e.g., X2 interface). The third backhaul links  134  may be wired or wireless. 
     The base stations  102  may wirelessly communicate with the UEs  104 . Each of the base stations  102  may provide communication coverage for a respective geographic coverage area  110 . There may be overlapping geographic coverage areas  110 . For example, the small cell  102 ′ may have a coverage area  110 ′ that overlaps the coverage area  110  of one or more macro base stations  102 . A network that includes both small cell and macrocells may be known as a heterogeneous network. A heterogeneous network may also include Home Evolved Node Bs (eNBs) (HeNBs), which may provide service to a restricted group known as a closed subscriber group (CSG). The communication links  120  between the base stations  102  and the UEs  104  may include uplink (UL) (also referred to as reverse link) transmissions from a UE  104  to a base station  102  and/or downlink (DL) (also referred to as forward link) transmissions from a base station  102  to a UE  104 . The communication links  120  may use multiple-input and multiple-output (MIMO) antenna technology, including spatial multiplexing, beamforming, and/or transmit diversity. The communication links may be through one or more carriers. The base stations  102 /UEs  104  may use spectrum up to Y MHz (e.g., 5, 10, 15, 20, 100, 400, etc. MHz) bandwidth per carrier allocated in a carrier aggregation of up to a total of Yx MHz (x component carriers) used for transmission in each direction. The carriers may or may not be adjacent to each other. Allocation of carriers may be asymmetric with respect to DL and UL (e.g., more or fewer carriers may be allocated for DL than for UL). The component carriers may include a primary component carrier and one or more secondary component carriers. A primary component carrier may be referred to as a primary cell (PCell) and a secondary component carrier may be referred to as a secondary cell (SCell). 
     Certain UEs  104  may communicate with each other using device-to-device (D2D) communication link  158 . The D2D communication link  158  may use the DL/UL WWAN spectrum. The D2D communication link  158  may use one or more sidelink channels, such as a physical sidelink broadcast channel (PSBCH), a physical sidelink discovery channel (PSDCH), a physical sidelink shared channel (PSSCH), and a physical sidelink control channel (PSCCH). D2D communication may be through a variety of wireless D2D communications systems, such as for example, FlashLinQ, WiMedia, Bluetooth, ZigBee, Wi-Fi based on the Institute of Electronics Engineers (IEEE) 802.11 standard, LTE, or NR. 
     The wireless communications system may further include a Wi-Fi access point (AP)  150  in communication with Wi-Fi stations (STAs)  152  via communication links  154  in a 5 GHz unlicensed frequency spectrum. When communicating in an unlicensed frequency spectrum, the STAs  152 /AP  150  may perform a clear channel assessment (CCA) prior to communicating in order to determine whether the channel is available. 
     The small cell  102 ′ may operate in a licensed and/or an unlicensed frequency spectrum. When operating in an unlicensed frequency spectrum, the small cell  102 ′ may employ NR and use the same 5 GHz unlicensed frequency spectrum as used by the Wi-Fi AP  150 . The small cell  102 ′, employing NR in an unlicensed frequency spectrum, may boost coverage to and/or increase capacity of the access network. 
     A base station  102 , whether a small cell  102 ′ or a large cell (e.g., macro base station), may include and/or be referred to as an eNB, gNodeB (gNB), or another type of base station. Some base stations, such as gNB  180  may operate in a traditional sub 6 GHz spectrum, in millimeter wave (mmW) frequencies, and/or near mmW frequencies in communication with the UE  104 . When the gNB  180  operates in mmW or near mmW frequencies, the gNB  180  may be referred to as an mmW base station. Extremely high frequency (EHF) is part of the radio frequency (RF) in the electromagnetic spectrum. EHF has a range of 30 GHz to 300 GHz and a wavelength between 1 millimeter and 10 millimeters. Radio waves in the band may be referred to as a millimeter wave. Near mmW may extend down to a frequency of 3 GHz with a wavelength of 100 millimeters. The super high frequency (SHF) band extends between 3 GHz and 30 GHz, also referred to as centimeter wave. Communications using the mmW/near mmW radio frequency band (e.g., 3 GHz-300 GHz) has extremely high path loss and a short range. The mmW base station  180  may utilize beamforming  182  with the UE  104  to compensate for the extremely high path loss and short range. The base station  180  and the UE  104  may each include a plurality of antennas, such as antenna elements, antenna panels, and/or antenna arrays to facilitate the beamforming. 
     The base station  180  may transmit a beamformed signal to the UE  104  in one or more transmit directions  182 ′. The UE  104  may receive the beamformed signal from the base station  180  in one or more receive directions  182 ″. The UE  104  may also transmit a beamformed signal to the base station  180  in one or more transmit directions. The base station  180  may receive the beamformed signal from the UE  104  in one or more receive directions. The base station  180 /UE  104  may perform beam training to determine the best receive and transmit directions for each of the base station  180 /UE  104 . The transmit and receive directions for the base station  180  may or may not be the same. The transmit and receive directions for the UE  104  may or may not be the same. 
     The EPC  160  may include a Mobility Management Entity (MME)  162 , other MMEs  164 , a Serving Gateway  166 , a Multimedia Broadcast Multicast Service (MBMS) Gateway  168 , a Broadcast Multicast Service Center (BM-SC)  170 , and a Packet Data Network (PDN) Gateway  172 . The MME  162  may be in communication with a Home Subscriber Server (HSS)  174 . The MME  162  is the control node that processes the signaling between the UEs  104  and the EPC  160 . Generally, the MME  162  provides bearer and connection management. All user Internet protocol (IP) packets are transferred through the Serving Gateway  166 , which itself is connected to the PDN Gateway  172 . The PDN Gateway  172  provides UE IP address allocation as well as other functions. The PDN Gateway  172  and the BM-SC  170  are connected to the IP Services  176 . The IP Services  176  may include the Internet, an intranet, an IP Multimedia Subsystem (IMS), a packet-switched (PS) streaming service, and/or other IP services. The BM-SC  170  may provide functions for MBMS user service provisioning and delivery. The BM-SC  170  may serve as an entry point for content provider MBMS transmission, may be used to authorize and initiate MBMS Bearer Services within a public land mobile network (PLMN), and may be used to schedule MBMS transmissions. The MBMS Gateway  168  may be used to distribute MBMS traffic to the base stations  102  belonging to a Multicast Broadcast Single Frequency Network (MBSFN) area broadcasting a particular service, and may be responsible for session management (start/stop) and for collecting eMBMS related charging information. 
     The core network  190  may include an Access and Mobility Management Function (AMF)  192 , other AMFs  193 , a Session Management Function (SMF)  194 , and a User Plane Function (UPF)  195 . The AMF  192  may be in communication with a Unified Data Management (UDM)  196 . The AMF  192  is the control node that processes the signaling between the UEs  104  and the core network  190 . Generally, the AMF  192  provides QoS flow and session management. All user Internet protocol (IP) packets are transferred through the UPF  195 . The UPF  195  provides UE IP address allocation as well as other functions. The UPF  195  is connected to the IP Services  197 . The IP Services  197  may include the Internet, an intranet, an IP Multimedia Subsystem (IMS), a PS Streaming Service, and/or other IP services. 
     The base station may include and/or be referred to as a gNB, Node B, 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 transmit reception point (TRP), or some other suitable terminology. The base station  102  provides an access point to the EPC  160  or core network  190  for a UE  104 . Examples of UEs  104  include a cellular phone, a smart phone, a session initiation protocol (SIP) phone, a laptop, a personal digital assistant (PDA), a satellite radio, a global positioning system, a multimedia device, a video device, a digital audio player (e.g., MP3 player), a camera, a game console, a tablet, a smart device, a wearable device, a vehicle, an electric meter, a gas pump, a large or small kitchen appliance, a healthcare device, an implant, a sensor/actuator, a display, or any other similar functioning device. Some of the UEs  104  may be referred to as IoT devices (e.g., parking meter, gas pump, toaster, vehicles, heart monitor, etc.). The UE  104  may also be referred to as a station, a mobile station, a subscriber station, a mobile unit, a subscriber unit, a wireless unit, a remote unit, a mobile device, a wireless device, a wireless communications device, a remote device, a mobile subscriber station, an access terminal, a mobile terminal, a wireless terminal, a remote terminal, a handset, a user agent, a mobile client, a client, or some other suitable terminology. 
     Although the present disclosure may focus on 5G NR, the concepts and various aspects described herein may be applicable to other similar areas, such as LTE, LTE-Advanced (LTE-A), Code Division Multiple Access (CDMA), Global System for Mobile communications (GSM), or other wireless/radio access technologies. 
     Referring again to  FIG. 1 , in certain aspects, the base station  102 / 180  may be configured to transmit each of a set of signals to the UE  104  on at least one channel configured with the UE  104 . The UE  104  may receive one or more of the set of signals in one or more of the receive directions  182 ″, as the base station  102 / 180  transmits each of the set of signals in a respective one of the transmit directions  182 ′. The set of signals, for example, may include reference signals and/or synchronization signals. 
     The base station  102 / 180  may determine a metric associated with MIMO communication with the UE  104  based on at least one operational state associated with the at least one channel configured with the UE  104  ( 198 ). The base station  102 / 180  may transmit information indicating the metric to the UE  104 . In one aspect, the base station  102 / 180  may explicitly indicate this information to the UE  104 , e.g., in a reporting configuration that includes a group-based beam report field. In another aspect, the base station  102 / 180  may configure the at least one operational state of the at least one channel, and the base station  102 / 180  may implicitly indicate the metric to the UE  104  via the at least one configured operational state. 
     Correspondingly, the UE  104  may determine a metric associated with the MIMO communication with the base station  102 / 180  based on at least one operational state associated with the at least one channel configured with the base station  102 / 180  ( 198 ). In one aspect, the UE  104  may determine the metric as indicated in the reporting configuration, which may be based on at least one operational state associated with the at least one channel. In another aspect, the UE  104  may determine the metric based on the operational state associated with the at least one channel as configured by the base station  102 / 180 . 
     The UE  104  may determine at least one value of the metric based on at least one signal of the set of signals received from the base station  102 / 180  on the at least one channel. The at least one value may correspond to at least one set of resources. For example, the at least one value may correspond to one or more of spatial resources, time resources, and/or frequency resources. In one aspect, the at least one value may include at least two values, each of which may correspond to at least one set of resources. In another aspect, the at least one value may include one value that corresponds to at least two set of resources. 
     The UE  104  may transmit a report indicating the at least one value of the metric to the base station  102 / 180 . The base station  102 / 180  may receive the report and, based on the at least one value of the metric indicated therein, may configure MIMO communication with the UE  104  on the at least one channel. Accordingly, configuration of MIMO communication may be improved through the approaches and solutions described in the present disclosure for dynamically indicating metrics based on operational states of channels between base stations and UEs. 
       FIG. 2A  is a diagram  200  illustrating an example of a first subframe within a 5G/NR frame structure.  FIG. 2B  is a diagram  230  illustrating an example of DL channels within a 5G/NR subframe.  FIG. 2C  is a diagram  250  illustrating an example of a second subframe within a 5G/NR frame structure.  FIG. 2D  is a diagram  280  illustrating an example of UL channels within a 5G/NR subframe. The 5G/NR frame structure may be frequency-division duplexed (FDD) in which for a particular set of subcarriers (carrier system bandwidth), subframes within the set of subcarriers are dedicated for either DL or UL, or may be time-division duplexed (TDD) in which for a particular set of subcarriers (carrier system bandwidth), subframes within the set of subcarriers are dedicated for both DL and UL. In the examples provided by  FIGS. 2A, 2C , the 5G/NR frame structure is assumed to be TDD, with subframe 4 being configured with slot format 28 (with mostly DL), where D is DL, U is UL, and X is flexible for use between DL/UL, and subframe 3 being configured with slot format 34 (with mostly UL). While subframes 3, 4 are shown with slot formats 34, 28, respectively, any particular subframe may be configured with any of the various available slot formats 0-61. Slot formats 0, 1 are all DL, UL, respectively. Other slot formats 2-61 include a mix of DL, UL, and flexible symbols. UEs are configured with the slot format (dynamically through DL control information (DCI), or semi-statically/statically through radio resource control (RRC) signaling) through a received slot format indicator (SFI). Note that the description infra applies also to a 5G/NR frame structure that is TDD. 
     Other wireless communication technologies may have a different frame structure and/or different channels. A frame (10 ms) may be divided into 10 equally sized subframes (1 ms). Each subframe may include one or more time slots. Subframes may also include mini-slots, which may include 7, 4, or 2 symbols. Each slot may include 7 or 14 symbols, depending on the slot configuration. For slot configuration 0, each slot may include 14 symbols, and for slot configuration 1, each slot may include 7 symbols. The symbols on DL may be cyclic prefix (CP) OFDM (CP-OFDM) symbols. The symbols on UL may be CP-OFDM symbols (for high throughput scenarios) or discrete Fourier transform (DFT) spread OFDM (DFT-s-OFDM) symbols (also referred to as single carrier frequency-division multiple access (SC-FDMA) symbols) (for power limited scenarios; limited to a single stream transmission). The number of slots within a subframe is based on the slot configuration and the numerology. For slot configuration 0, different numerologies μ 0 to 5 allow for 1, 2, 4, 8, 16, and 32 slots, respectively, per subframe. For slot configuration 1, different numerologies 0 to 2 allow for 2, 4, and 8 slots, respectively, per subframe. Accordingly, for slot configuration 0 and numerology μ, there are 14 symbols/slot and 2 μ  slots/subframe. The subcarrier spacing and symbol length/duration are a function of the numerology. The subcarrier spacing may be equal to 2 μ *15 kHz, where μ is the numerology 0 to 5. As such, the numerology μ=0 has a subcarrier spacing of 15 kHz and the numerology μ=5 has a subcarrier spacing of 480 kHz. The symbol length/duration is inversely related to the subcarrier spacing.  FIGS. 2A-2D  provide an example of slot configuration 0 with 14 symbols per slot and numerology μ=0 with 1 slot per subframe. The subcarrier spacing is 15 kHz and symbol duration is approximately 66.7 μs. 
     A resource grid may be used to represent the frame structure. Each time slot includes a resource block (RB) (also referred to as physical RBs (PRBs)) that extends 12 consecutive subcarriers. The resource grid is divided into multiple resource elements (REs). The number of bits carried by each RE depends on the modulation scheme. 
     As illustrated in  FIG. 2A , some of the REs carry reference (pilot) signals (RS) for the UE. The RS may include demodulation RS (DM-RS) (indicated as R x  for one particular configuration, where 100× is the port number, but other DM-RS configurations are possible) and channel state information (CSI) reference signals (CSI-RS) for channel estimation at the UE. The RS may also include beam measurement RS (BRS), beam refinement RS (BRRS), and phase tracking RS (PT-RS). 
       FIG. 2B  illustrates an example of various DL channels within a subframe of a frame. The physical downlink control channel (PDCCH) carries DCI within one or more control channel elements (CCEs), each CCE including nine RE groups (REGs), each REG including four consecutive REs in an OFDM symbol. A primary synchronization signal (PSS) may be within symbol 2 of particular subframes of a frame. The PSS is used by a UE  104  to determine subframe/symbol timing and a physical layer identity. A secondary synchronization signal (SSS) may be within symbol 4 of particular subframes of a frame. The SSS is used by a UE to determine a physical layer cell identity group number and radio frame timing. Based on the physical layer identity and the physical layer cell identity group number, the UE can determine a physical cell identifier (PCI). Based on the PCI, the UE can determine the locations of the aforementioned DM-RS. The physical broadcast channel (PBCH), which carries a master information block (MIB), may be logically grouped with the PSS and SSS to form a synchronization signal (SS)/PBCH block, which may be referred to as an SSB. The MIB provides a number of RBs in the system bandwidth and a system frame number (SFN). The physical downlink shared channel (PDSCH) carries user data, broadcast system information not transmitted through the PBCH such as system information blocks (SIBs), and paging messages. 
     As illustrated in  FIG. 2C , some of the REs carry DM-RS (indicated as R for one particular configuration, but other DM-RS configurations are possible) for channel estimation at the base station. The UE may transmit DM-RS for the physical uplink control channel (PUCCH) and DM-RS for the physical uplink shared channel (PUSCH). The PUSCH DM-RS may be transmitted in the first one or two symbols of the PUSCH. The PUCCH DM-RS may be transmitted in different configurations depending on whether short or long PUCCHs are transmitted and depending on the particular PUCCH format used. The UE may transmit sounding reference signals (SRS). The SRS may be transmitted in the last symbol of a subframe. The SRS may have a comb structure, and a UE may transmit SRS on one of the combs. The SRS may be used by a base station for channel quality estimation to enable frequency-dependent scheduling on the UL. 
       FIG. 2D  illustrates an example of various UL channels within a subframe of a frame. The PUCCH may be located as indicated in one configuration. The PUCCH carries uplink control information (UCI), such as scheduling requests, a channel quality indicator (CQI), a precoding matrix indicator (PMI), a rank indicator (RI), and hybrid automatic repeat request (HARQ) ACK/NACK feedback. The PUSCH carries data, and may additionally be used to carry a buffer status report (BSR), a power headroom report (PHR), and/or UCI. 
       FIG. 3  is a block diagram of a base station  310  in communication with a UE  350  in an access network. In the DL, IP packets from the EPC  160  may be provided to a controller/processor  375 . The controller/processor  375  implements layer 3 and layer 2 functionality. Layer 3 includes a radio resource control (RRC) layer, and layer 2 includes a service data adaptation protocol (SDAP) layer, a packet data convergence protocol (PDCP) layer, a radio link control (RLC) layer, and a medium access control (MAC) layer. The controller/processor  375  provides RRC layer functionality associated with broadcasting of system information (e.g., MIB, SIBs), RRC connection control (e.g., RRC connection paging, RRC connection establishment, RRC connection modification, and RRC connection release), inter radio access technology (RAT) mobility, and measurement configuration for UE measurement reporting; PDCP layer functionality associated with header compression/decompression, security (ciphering, deciphering, integrity protection, integrity verification), and handover support functions; RLC layer functionality associated with the transfer of upper layer packet data units (PDUs), error correction through ARQ, concatenation, segmentation, and reassembly of RLC service data units (SDUs), re-segmentation of RLC data PDUs, and reordering of RLC data PDUs; and MAC layer functionality associated with mapping between logical channels and transport channels, multiplexing of MAC SDUs onto transport blocks (TBs), demultiplexing of MAC SDUs from TBs, scheduling information reporting, error correction through HARQ, priority handling, and logical channel prioritization. 
     The transmit (TX) processor  316  and the receive (RX) processor  370  implement layer 1 functionality associated with various signal processing functions. Layer 1, which includes a physical (PHY) layer, may include error detection on the transport channels, forward error correction (FEC) coding/decoding of the transport channels, interleaving, rate matching, mapping onto physical channels, modulation/demodulation of physical channels, and MIMO antenna processing. The TX processor  316  handles mapping to signal constellations based on various modulation schemes (e.g., binary phase-shift keying (BPSK), quadrature phase-shift keying (QPSK), M-phase-shift keying (M-PSK), M-quadrature amplitude modulation (M-QAM)). The coded and modulated symbols may then be split into parallel streams. Each stream may then be mapped to an OFDM subcarrier, multiplexed with a reference signal (e.g., pilot) in the time and/or frequency domain, and then combined together using an Inverse Fast Fourier Transform (IFFT) to produce a physical channel carrying a time domain OFDM symbol stream. The OFDM stream is spatially precoded to produce multiple spatial streams. Channel estimates from a channel estimator  374  may be used to determine the coding and modulation scheme, as well as for spatial processing. The channel estimate may be derived from a reference signal and/or channel condition feedback transmitted by the UE  350 . Each spatial stream may then be provided to a different antenna  320  via a separate transmitter  318 TX. Each transmitter  318 TX may modulate an RF carrier with a respective spatial stream for transmission. 
     At the UE  350 , each receiver  354 RX receives a signal through its respective antenna  352 . Each receiver  354 RX recovers information modulated onto an RF carrier and provides the information to the receive (RX) processor  356 . The TX processor  368  and the RX processor  356  implement layer 1 functionality associated with various signal processing functions. The RX processor  356  may perform spatial processing on the information to recover any spatial streams destined for the UE  350 . If multiple spatial streams are destined for the UE  350 , they may be combined by the RX processor  356  into a single OFDM symbol stream. The RX processor  356  then converts the OFDM symbol stream from the time-domain to the frequency domain using a Fast Fourier Transform (FFT). The frequency domain signal comprises a separate OFDM symbol stream for each subcarrier of the OFDM signal. The symbols on each subcarrier, and the reference signal, are recovered and demodulated by determining the most likely signal constellation points transmitted by the base station  310 . These soft decisions may be based on channel estimates computed by the channel estimator  358 . The soft decisions are then decoded and deinterleaved to recover the data and control signals that were originally transmitted by the base station  310  on the physical channel. The data and control signals are then provided to the controller/processor  359 , which implements layer 3 and layer 2 functionality. 
     The controller/processor  359  can be associated with a memory  360  that stores program codes and data. The memory  360  may be referred to as a computer-readable medium. In the UL, the controller/processor  359  provides demultiplexing between transport and logical channels, packet reassembly, deciphering, header decompression, and control signal processing to recover IP packets from the EPC  160 . The controller/processor  359  is also responsible for error detection using an ACK and/or NACK protocol to support HARQ operations. 
     Similar to the functionality described in connection with the DL transmission by the base station  310 , the controller/processor  359  provides RRC layer functionality associated with system information (e.g., MIB, SIBs) acquisition, RRC connections, and measurement reporting; PDCP layer functionality associated with header compression/decompression, and security (ciphering, deciphering, integrity protection, integrity verification); RLC layer functionality associated with the transfer of upper layer PDUs, error correction through ARQ, concatenation, segmentation, and reassembly of RLC SDUs, re-segmentation of RLC data PDUs, and reordering of RLC data PDUs; and MAC layer functionality associated with mapping between logical channels and transport channels, multiplexing of MAC SDUs onto TBs, demultiplexing of MAC SDUs from TBs, scheduling information reporting, error correction through HARQ, priority handling, and logical channel prioritization. 
     Channel estimates derived by a channel estimator  358  from a reference signal or feedback transmitted by the base station  310  may be used by the TX processor  368  to select the appropriate coding and modulation schemes, and to facilitate spatial processing. The spatial streams generated by the TX processor  368  may be provided to different antenna  352  via separate transmitters  354 TX. Each transmitter  354 TX may modulate an RF carrier with a respective spatial stream for transmission. 
     The UL transmission is processed at the base station  310  in a manner similar to that described in connection with the receiver function at the UE  350 . Each receiver  318 RX receives a signal through its respective antenna  320 . Each receiver  318 RX recovers information modulated onto an RF carrier and provides the information to a RX processor  370 . 
     The controller/processor  375  can be associated with a memory  376  that stores program codes and data. The memory  376  may be referred to as a computer-readable medium. In the UL, the controller/processor  375  provides demultiplexing between transport and logical channels, packet reassembly, deciphering, header decompression, control signal processing to recover IP packets from the UE  350 . IP packets from the controller/processor  375  may be provided to the EPC  160 . The controller/processor  375  is also responsible for error detection using an ACK and/or NACK protocol to support HARQ operations. 
     In some aspect of the present disclosure related to a UE, at least one of the TX processor  368 , the RX processor  356 , and the controller/processor  359  may be configured to perform aspects in connection with ( 198 ) of  FIG. 1 . 
     In some other aspects of the present disclosure related to a base station, at least one of the TX processor  316 , the RX processor  370 , and the controller/processor  375  may be configured to perform aspects in connection with ( 198 ) of  FIG. 1 . 
     According to various aspects of the present disclosure, a base station and a UE may perform beam management in order to select and adjust beams for communication between the UE and the base station. In downlink beam management, the base station may provide opportunities for the UE to measure beamformed channels of different combinations of Tx beams from the base station and UE Rx beams by transmitting a reference signal with different Tx beams. The base station may provide a beam management configuration to UE. The beam management configuration may include CSI-RS resource configuration, beam report setting, etc. The base station may perform periodic beam sweeping by transmitting a reference signal with different, individual Tx beams. The UE may measure information about a beamformed channel state with different UE Rx beams and may report the measurements to the base station. The UE may report measurement information such as a RSRP, CSI, etc. 
     After the UE detects the reference signal and performs measurements, the UE may send information about the beams back to the base station. The report may include a CSI report. The UE may use CSI-RSs and/or SSBs to perform measurements for different beams and to provide a CSI report. The SSB is used for initial access and may not require additional overhead for use in beam management. The SSB may have limited bandwidth, whereas CSI-RS may be configured with a different frequency range. The transmission of a CSI-RS for beam management may use additional overhead, yet may enable flexibility in the allocation of resources for the reference signal. 
     Beam management may be performed on a per beam basis with the UE measuring and reporting for individual beams. Group-based beam reporting may reduce signaling/feedback overhead for beam management for transmission/reception. For example, beam management may be performed and reported for a group of beams rather than for individual beams. Group-based beam management can be performed such that beam tracking and refinement within a group or multiple groups of beams can be supported. 
     The group-based beam reporting may reduce reporting compared to non-group-based beam reporting. A group-based beam report may include measurement information for a representative beam measured by a UE. The representative beam may be one of the beams in the group of beams or may represent an average of the measurements for the beams in the group. For example, the representative beam may be a beam that has a maximum measurement value compared to other beams in the group. The group-based report may include a reference signal received power (RSRP) for the representative beam and/or a differential RSRP for a different beam in the beam group. 
     Group-based beam reporting may be based on a report quantity set, RSRP (e.g., CRI-RSRP, SSB-index-RSRP, L1-RSRP, etc.), and/or SINR (e.g., CRI-SINR, SSB-Index-SINR, L1-SINR, etc.). The group-based beam reporting may include a metric, such as RSRP and/or SINR (e.g., CRI-SINR, SSB-Index-SINR, CRI-RSRP, SSB-index-RSRP, L1-RSRP, and/or other metric(s)). For example, the UE may report a largest SINR or largest RSRP (e.g., 7 bits) from the measured reference signals and/or a differential SINR or differential L1-RSRP (e.g., 4 bits) with respect to a largest measured SINR or largest measured RSRP, respectively. In some aspects, the group-based beam reporting might not include other CSI quantities per CSI-RS resource indicator (CRI)/SS/PBCH resource block indicator (SSBRI). The beam-based report may include measurement information for individual beams. The group-based report may have less information about individual beams than the beam-based report. 
     A base station may configure a UE for L1-SINR based beam report for non-group-based and/or group-based beam reporting. When the base station configures the UE to report an SSBRI and/or a CRI and the corresponding L1-SINR, the report format may include a range and a step size of differential SINR. For example, a differential SINR for a group of N beams, may be determined based on the difference between the measured SINR corresponding to the CRI/SSBRI for the N beams and the measured SINR corresponding to CRI/SSBRI for a beam having the largest SINR among the reported SINRs. 
     In order to improve link performance and to increase throughput, wireless communication between a base station and a UE may use multi-beam simultaneous transmission and reception. The use of multiple beams may provide macro-diversity as well as higher rates using MIMO techniques. Beam grouping and group-based beam reporting may support simultaneous reception at a UE, e.g., using the same spatial filters or different spatial filters at the receiver. 
     When a UE is configured to enable group-based beam reporting, the UE can report multiple different CRI/SSBRI per report setting, such as two different CRI/SSBRI per report setting. The CSI-RS and/or SSB resources upon which the CRI/SSBRI are respectively based may be received simultaneously by the UE either with a single beam or with multiple simultaneous beams. The measurement by the UE of the reference signals and the grouping of beams may be used for simultaneous Tx/Rx, e.g., with a joint QCL in a data channel. In some examples, the UE may be configured to simultaneously receive the CSI-RS and/or SSB resources via a single beam or with multiple simultaneous beams. 
     In some example access networks, however, a procedure for reporting other metrics for reference and/or synchronization signals carried on one or more sets of resources may be absent. For example, some access networks may not support dynamic reporting of other metrics and/or joint quantities of a metric associated with reference and/or synchronization signals carried on simultaneously received sets of resources. Consequently, group-based beam reporting configured for a UE may be based on heuristics and/or based on UE implementation, and therefore, may lack adequate information regarding joint channel properties for simultaneous transmission and reception on a channel configured with a base station. Therefore, a need exists for solutions to reporting metrics related to joint channel properties. 
       FIGS. 4-7  illustrate some approaches and solutions that support various feedback metrics for resource grouping in association with transmission and reception operation modes and/or channel states, such as MIMO schemes, SINRs, channel properties, and the like. For example,  FIGS. 4-7  describe, inter alia, dynamically indicating metrics to be reported by UEs so that simultaneous transmission and reception may be sufficiently supported. 
     Referring to  FIG. 4 , an access network  400  may include a base station  402  and a UE  404  configured to communicate on at least one channel  410 . In some aspects, the base station  402  and the UE  404  may be configured for mmW/near-mmW communication. With mmW/near-mmW communication, for example, the base station  402  may configure a MIMO scheme with the UE  404 . In order to configure MIMO schemes, the base station  402  and the UE  404  may select M beams  412 ,  414  (e.g., beam pair links) out of N available beams  412 ,  414  (e.g., beam pair links). Such configurations may rely on beam training and management, e.g., to account for the conditions of the channel  410  on which the base station  402  and the UE  404  communicate. 
     The base station  402  and the UE  404  may select M beams  412 ,  414  based on beam training/management and/or channel measurements/feedback (e.g., as described supra). However, the UE  404  may include fewer antenna ports to measure the channel  410  than the number of physical antenna elements of the UE  404 . For example, the base station  402  and the UE  404  may transmit and receive, respectively, on the channel  410 , represented as H, as an effective channel, represented as H eff . The effective channel may be a function of the receiver analog combiner W RF =[w 1 , w 2 , . . . , w n ] and the transmitter analog precoder F RF =[f 1 , f 2 , . . . , f n ], where each of W RF  and F RF  may be a matric including beam weights w 1 , w 2 , . . . , w n  and f 1 , f 2 , . . . , f n , respectively. At a respective PHY layer (e.g., baseband), then, the effective channel may be observed according to Equation 1 (where W RF * is the conjugate): 
     
       
      
       H 
       e 
       =W 
       RF 
       *HF 
       RF  
      
     
     As observation on the channel  410  may be limited (e.g., by the number of antenna ports) to observations on the effective channel, the base station  402  and the UE  404  may benefit from an dynamically indicating metrics for resource grouping based on at least one operational state associated with the channel  410 . Thus, the base station  402  may dynamically configure the UE  404  with a reporting metric for a group-based beam report based on the at least one operational state of the channel  410 . Correspondingly, the UE  404  may measure at least one value for the reporting metric based on signals (e.g., CSI-RSs and/or SSBs) transmitted by the base station  402  with the Tx beams  412  and received by the UE  404  with the Rx beams  414 . 
     The at least one value may correspond to spatial, time, and/or frequency resources, the UE  404  may report the at least one value, for example, as a plurality of values respectively corresponding to a plurality of sets of resources and/or as a single value corresponding to a plurality of sets of resources. In so doing, the UE  404  may capture joint quantities per beam and, when reported to the base station  402 , may enable to base station to configure at least one operational state  420 —for example, the at least one operational state  420  may include a MIMO scheme, such as a time-division multiplexing (TDM) scheme, frequency-division multiplexing (FDM), and/or spatial division multiplexing (SDM) scheme, and/or a use case, such as enhanced mobile broadband (eMBB), ultra-reliable low-latency communications (URLLC), and/or massive machine-type communications (mMTC). 
     In some aspects, the at least one operational state  420  may include one or more properties of the channel  410 . For example, the at least one operational state  420  may include the noise or interference on the channel  410 , blockages on the channel  410  (if any), and/or the capacity of the channel  410 . 
     In some other aspects, the at least one operational state  420  of the channel  410  may include configurations of the channel  410 , for example, as configured by the base station  402 . For example, the at least one operational state  420  of the channel  410  include a multiplexing scheme and/or MIMO scheme configured on the channel  410 , such as TDM, FDM, and/or SDM. In some other examples, the at least one operational state  420  may include spatial domain transmit filters (e.g., at the base station  402 ) and/or spatial domain receive filters (e.g., at the UE  404 ) configured to form the links between pairs of beams  412 ,  414 . 
     In some further examples, the at least one operational state  420  of the channel  410  may include a modulation and coding scheme (MCS) configured by the base station  402  and signaled to the UE  404 . In some additional example, the at least one operational state  420  of the channel  410  may include a use case, such as eMBB, URLLC, and/or mMTC. 
     The base station  402  may determine the at least one operational state  420  of the channel  410 . For example, the base station  402  may determine one or more of an operational signal-to-noise ratio (SNR) and/or SINR associated with a link between a pair of beams  412 ,  414 , an effective SNR and/or SINR associated with the channel  410 , an operational RSRP associated with a link between a pair of beams  412 ,  414 , an effective RSRP associated with the channel  410 , one or more spatial properties of the channel  410 , a link or channel model, a link or channel capacity, mutual information, and/or a multiplexing scheme configured for the channel  410 . 
     By way of illustration, an operational SNR and/or SINR may include an SNR and/or SINR, respectively, measured from at least one of a set of signals received on the channel  410  and/or via a pair of beams  412 ,  414 . An operational SNR and/or SINR may be based on information (e.g., received in a report) indicating SNR and/or SINR measurement(s) from at least one of a set of signals received on the channel  410  and/or via a pair of beams  412 ,  414 . In some aspects, an operational SNR and/or SINR may be based on an individual beam pair link—e.g., one of the beams  412  of the base station  402  paired with one of the beams  414  of the UE  404 . An effective SNR and/or SINR, however, may be based on at least two beam pair links, which may be configured as a joint channel; for example, an effective SNR and/or SINR may be based on at least two of the beams  412  of the base station  402  respectively paired with at least two of the beams  414  of the UE  404 . In some additional and/or alternative aspects, an effective SNR and/or SINR may be based on information (e.g., received in a report) indicating SNR and/or SINR measurement(s) from at least one of a set of signals received on the channel  410  and/or via a pair of beams  412 ,  414 , and additionally, may be based on other information associated with the quality of communication on the channel  410  and/or via a pair of beams  412 ,  414 , such as a link quality indicator (LQI) and/or other information indicative of communication quality on the channel  410  and/or via a pair of beams  412 ,  414 . For example, the effective SNR and/or SINR may include information that is based on a combination of SNR and/or SINR measurement(s) and information associated with the quality of communication on the channel  410  and/or via a pair of beams  412 ,  414 , such as an LQI. 
     Similarly, an operational RSRP may be based on information (e.g., received in a report) indicating RSRP measurement(s) from at least one of a set of signals received on the channel  410  and/or via a pair of beams  412 ,  414 . In some aspects, an operational RSRP may be based on an individual beam pair link—e.g., one of the beams  412  of the base station  402  paired with one of the beams  414  of the UE  404 . An effective RSRP, however, may be based on at least two beam pair links, which may be configured as a joint channel; for example, an effective RSRP may be based on at least two of the beams  412  of the base station  402  respectively paired with at least two of the beams  414  of the UE  404 . In some additional and/or alternative aspects, an effective RSRP may be based on information (e.g., received in a report) indicating RSRP measurement(s) from at least one of a set of signals received on the channel  410  and/or via a pair of beams  412 ,  414 , and additionally, may be based on other information associated with the quality of communication on the channel  410  and/or via a pair of beams  412 ,  414 , such as an LQI and/or other information indicative of communication quality on the channel  410  and/or via a pair of beams  412 ,  414 . For example, the effective RSRP may include information that is based on a combination of RSRP measurement(s) and information associated with the quality of communication on the channel  410  and/or via a pair of beams  412 ,  414 , such as an LQI. 
     According to various additional illustrative examples, one or more spatial properties of the channel  410  may include signal gain, signal power, angle of arrival of a signal, fading, angular spread, and/or one or more other spatial properties associated with the channel  410 . A link or channel model may include information simulating wireless propagation (e.g., with spatial diversity and/or polarization) associated with the channel  410 , information indicating one or more blockages associated with the channel  410  and/or the environments of the base station  402  and/or the UE  404  (e.g., affecting communication on the channel  410 ), and/or other information that may model the channel  410 . A link or channel capacity may include information indicating the capacity of the channel  410 , such as a rate (e.g., an upper bound) at which information can be reliably communicated on the channel  410 . Mutual information may include information (e.g., parameters, schemes, etc.) agreed upon and/or acknowledged between the base station  402  and the UE  404 , such as a mutual information associated with modulated symbols and/or coded bits, mutual information associated with SNR and/or SINR, and/or mutual information associated with a block error rate (BLER) of communication on the channel  410 . A multiplexing scheme may include a configuration, e.g., by the base station  102 / 180 , for multiplexing (e.g., time, frequency, and/or spatial) of information communicated on the channel  410 . 
     In some aspects, the base station  402  may determine the at least one operational state  420  based on measurements and/or other information received from the UE  404 , such as an SNR, SINR, RSRP, LQI, and/or one or more other measurements and/or other information. For example, the UE  404  may transmit one or more reports indicating the measurements and/or other information, such as one or more CSI reports, which may be received by the base station  402 . In some other aspects, the base station  402  may determine the at least one operational state  420  based on measurements and/or other information determined (e.g., performed) by the base station  402 . In still further aspects, the base station  402  may determine the at least one operational state  420  when the base station  402  configures the channel  410 , such as when the base station  402  configures a multiplexing scheme on the channel. 
       FIG. 5  illustrates example operations  500  in the access network  400  that includes the base station  402  and the UE  404 . As described, supra, the base station  402  and the UE  404  may communicate on the channel  410 , and the channel  410  may be associated with at least one operational state  420 . The at least one operational state  420  may be associated with one or more beam pair links configured between beams  412  of the base station  402  and corresponding beams  414  of the UE  404 . 
     Based on the at least one operational state  420  associated with the channel  410  configured with the UE  404 , the base station  402  may determine  520  a metric  522  associated with MIMO communication with the UE  404 . The base station  402  may determine the metric  522  to include at least one of a CQI, a PMI, and/or an RI, e.g., for one or more sets of resources. 
     In some aspects, the base station  402  may determine  520  the metric  522  as that which best represents multiple streams and/or beam pairs based on which a MIMO scheme can be configured. Thus, in determining  520  the metric  522 , the base station  402  may determine at least one set of resources to be reported for the metric  522 . For example, the base station  402  may determine a quantity of sets of resources to be reported for the metric  522  that represent diversity on the channel  410  in order to improve communication on the channel  410  through macro-diversity and/or MIMO schemes, such as a quantity of sets of resources that represent joint properties of different sets of resources on the channel. The one or more sets of resources may be spatial, time, and/or frequency resources. 
     The base station  402  may transmit information indicating the metric  522  to the UE  404 . The information indicating the metric  522  may indicate the one or more sets of resources to be reported for the metric  522 , such as a quantity of joint sets of resources that represent joint properties associated with the channel  410 . According to various aspects, the base station  402  may explicitly indicate the information indicating the metric  522  to the UE  404  or may implicitly indicate the information indicating the metric  522  to the UE  404 . 
     In order to explicitly indicate the metric  522  to the UE  404 , the base station  402  may transmit the information indicating the metric  522  to the UE  404  via one of RRC signaling, a MAC control element (CE), and/or in DCI. In one aspect, the base station  402  may include the information indicating the metric  522  in a reporting configuration  524 , which the base station  402  may transmit to the UE  404 . The reporting configuration  524  may be a CSI reporting configuration, and the base station  402  may include the metric  522  in a field associated with a group-based beam reporting. 
     In order to implicitly indicate the metric  522  to the UE  404 , the base station  402  may configure at least one operational state  420  of the channel  410  to indicate the metric  522 . According to some aspects, the base station  402  may configure one multiplexing scheme of a plurality of different multiplexing schemes (e.g., TDM, FDM, and/or SDM) for communication with the UE  404  on the channel  410 , and the configured multiplexing scheme may implicitly indicate the metric  522  to the UE  404 . For example, when the base station  402  configures an SDM multiplexing scheme on the channel  410 , the base station  402  may be implicitly indicating that reporting for the metric  522  should be on one or more sets of spatial resources corresponding to links formed between pairs of the beams  412 ,  414 . 
     In some aspects, the base station  402  may dynamically transmit information to the UE  404  that overrides or reconfigures the UE  404  from a previous reporting configuration. For example, the base station  402  may transmit a reporting configuration to the UE  404  that indicates a metric and at least one set of resources (e.g., a measurement set) and, subsequently, the base station  402  may transmit information to the UE  404  that explicitly or implicitly indicates the metric  522  or the at least one set of resources. Thus, one of the metric or the at least one set of resources indicated in the previous reporting configuration may still be valid for the UE  404 , but the other of the metric or the at least one set of resources may be reconfigured by the base station  402  for the UE  404 . 
     In addition to transmitting the information indicating the metric  522 , the base station  402  may transmit (e.g., periodically transmit) one or more sets of signals  526   a - c  to the UE  404 . According to various aspects, the signals  526   a - c  may be reference signals (e.g., CSI-RSs) and/or synchronization signals (e.g., SSBs). Potentially, the base station  402  may transmit each of the signals  526   a - c  with a respective one of the beams  412  of the base station  402 . The UE  404  may receive the signals  526   a - c , e.g., with a corresponding one of the beams  414  of the UE  404  forming a respective beam pair link between the base station  402  and the UE  404 . 
     Similar to the base station  402 , the UE  404  may determine the at least one operational state  420  of the channel  410 . For example, the UE  404  may determine one or more of an operational SNR and/or SINR associated with a link between a pair of beams  412 ,  414 , an effective SNR and/or SINR associated with the channel  410 , an operational RSRP associated with a link between a pair of beams  412 ,  414 , an effective RSRP associated with the channel  410 , one or more spatial properties of the channel  410 , a link or channel model (e.g., indicating one or more blockages, the environments of the base station  402  and/or the UE  404 , and the like), a link or channel capacity, mutual information, and/or a multiplexing scheme configured for the channel  410 . 
     In some aspects, the UE  404  may determine the at least one operational state  420  based on performing measurements based on signals (e.g., reference and/or synchronization signals) received from the base station  402 . In some other aspects, the UE  404  may determine the at least one operational state  420  based on information received from the base station  402 . For example, the base station  402  may configure the channel  410 , such as by configuring a multiplexing scheme on the channel  410 . The base station  402  may then transmit information indicating the channel configuration to the UE  404 , which may implicitly indicate the metric  522 . 
     Based on the at least one operational state  420  determined by the UE  404 , the UE  404  may determine  528  the metric  522  associated with MIMO communication with the base station  402 . When the base station  402  implicitly indicates the metric  522  to the UE  404 , the UE  404  may determine  528  the metric  522  by determining the at least one operational state  420  of the channel  410 . For example, the UE  404  may determine the multiplexing scheme configured for the channel  410  is FDM, and the UE  404  may determine that the base station  402  is implicitly indicating joint sets of frequency resources to be reported for the metric  522 . 
     Alternatively, when the base station  402  explicitly indicates the metric  522  to the UE  404 , the UE  404  may receive the information indicating the metric  522  via one of RRC signaling, a MAC CE, and/or DCI. In one aspect, the UE  404  may receive the reporting configuration  524  from the base station  402 , and the reporting configuration  524  may include information indicating the metric  522 , as determined by the base station  402  based on the at least one operational state  420  of the channel  410 . The UE  404  may determine  528  the metric  522 , as well as the one or more sets of resources (e.g., joint sets of resources), from the (explicit) indication transmitted by the base station  402 , as determined based on the at least one operational state  420  of the channel  410 . In some aspects, the UE  404  may determine  528  that the metric  522  overrides another metric received in a previously received reporting configuration. 
     Subsequently, the UE  404  may determine  530  at least one value  534  of the metric  522  based on one or more of the signals  526   a - c  (e.g., CSI-RSs and/or SSBs) received from the base station  402  on the channel  410 . The UE  404  may receive the signals  526   a - c  on sets of resources with a single one of the Rx beams  414  or with multiple ones of the Rx beams  414 . For example, the UE  404  may simultaneously receive CSI-RS and/or SSB resources with either a single spatial domain receive filter or with multiple simultaneous spatial domain receive filters. Accordingly, the UE  404  may determine  530  the at least one value  534  respectively corresponding to one or more sets of resources carrying one or more of the signals  526   a - c.    
     In one example, the UE  404  may determine  530  the at least one value  534  by calculating a PMI or RI CQI based on maximizing the mutual information between transmitted and received symbols, e.g., using at least two sets of resources. In another example, the UE  404  may determine  530  the at least one value  534  by calculating a CQI based on measuring SNRs, SINRs, and/or signal-to-noise-plus-distortion ratios (SNDRs) using at least two of the signals  526   a - c  carried on at least two different sets of resources, e.g., in order to derive a CQI for multiple streams. In a further example, the UE  404  may determine  530  the at least one value  534  by calculating mutual information for a group of links formed between pairs of beams  412 ,  414 . 
     As the base station  402  may indicate the sets of resources to be used by the UE  404  for determining the at least one value  534 , the UE  404  may determine  530  the at least one value  534  based on those sets of resources indicated by the base station  402 . For example, the UE  404  may determine at least two values each corresponding to at least one set of resources and/or the UE  404  may determine a single value corresponding to at least two different sets of resources—for example, the UE  404  may determine a joint CQI over at least two different sets of resources. 
     Alternatively, the UE  404  may determine  530  the at least one value  534  over different sets of resources than those indicated by the base station  402 . For example, the UE  404  may determine  530  the at least one value  534  using a single set of resources when the base station  402  has indicated a joint set of resources for the metric  522 . In another example, the UE  404  may determine  530  the at least one value  534  using fewer or greater sets of resources than indicated by the base station  402  for the metric  522 . In other words, the UE  404  potentially may determine a quantity for the at least one value  534  of the metric  522  that is different from the quantity of sets of resources signaled by the base station  402  in the information indicating the metric  522 . 
     By way of illustration, the UE  404  may determine that the effective and/or operational SNR on the channel  410  is relatively good (e.g., satisfies or meets/exceeds a threshold), and so the UE  404  may determine at least one value  534  of the metric  522  over sets of resources that represent diversity on the channel  410  in order to improve communication on the channel  410  through macro-diversity and/or MIMO schemes. Such a value may represent joint channel properties related to MIMO communication. Conversely, the UE  404  may determine that the effective and/or operational SNR on the channel  410  is relatively poor (e.g., does not satisfy or fails to meet/exceed a threshold), and so the UE  404  may determine at least one value  534  of the metric  522  on a single set of resources in order to maximize the performance of one link between one pair of beams  412 ,  414 . Thus, the UE  404  may independently indicate at least one value  534  of the metric  522  that corresponds to a quantity of sets of resources that is suitable for the at least one operational state  420  of the channel  410 , e.g., in order to prevent the base station  402  from configuring communication on the channel  410  that wastes time and power transmitting in multiple different directions when channel conditions are poor and power should be concentrated on one link between the beams  412 ,  414 . 
     The UE  404  may then transmit the at least one value  534  of the metric  522  to the base station  402 . In some aspects, the UE  404  may transmit two different values of the at least one value  534  corresponding to at least two sets of resources on which at least two of the signals  526   a - c  are received. Alternatively or additionally, the UE  404  may transmit one value of the at least one value  534  corresponding to at least two sets of resources on which at least two of the signals  526   a - c  are received. 
     The UE  404  may include the at least one value  534  of the metric  522  in a report  532 . The report  532  may be, for example, a CSI report. In some aspects, the UE  404  may transmit the report  532  in a configured reporting instance and/or on at least one configured reporting resource, such as at least one spatial resource (e.g., a configured beam or transmission configuration indicator (TCI) state), time resource, and/or frequency resource. 
     The base station  402  may receive the report  532  including the at least one value  534  of the metric  522 . Based on the at least one value  534  of the metric  522 , the base station  402  may configure  536  a communication mode on the channel  410 , such as by configuring an analog precoder based on the at least one value  534  of the metric  522 . For example, the base station  402  may configure a MIMO scheme or multiplexing scheme on the channel  410  for communication with the UE  404 . Illustratively, the base station  402  may configure FDM, TDM, and/or SDM on one or more streams based on the at least one value  534  of the metric  522 . 
     In some aspects, the base station  402  may configure  536  a communication mode on the channel  410  based on a preferred mode of the UE  404 , which may be indicated by the UE  404  through the at least one value  534  of the metric  522 . For example, when the at least one value  534  of the metric  522  correspond to a different quantity than that indicated by the base station  402 , which may indicate a different MIMO or multiplexing scheme than that configured by the base station  402 . Potentially, the UE  404  may indicate a preferred mode of single-input single-output (SISO) communication when at least one operational state  420  of the channel  410  is relatively poor. 
     The base station  402  may transmit information indicated the configured communication mode to the UE  404 . The UE  404  may receive the information indicating the configured communication mode from the base station  402 , and may configure one or more layers of the UE  404  according to the indicated communication mode. For example, the UE  404  may configure an analog combiner (e.g., at a PHY layer) in response to receiving the configured communication mode from the base station  402 . The base station  402  and the UE  404  may then communicate  538  according to the configured communication mode. 
       FIG. 6  is a flowchart of a method  600  of wireless communication. The method  600  may be performed by a UE (e.g., the UE  104 ,  350 ,  404 , which may include the memory  360  and which may be the entire UE  104 ,  350 ,  404  or a component of the UE  104 ,  350 ,  404 , such as the TX processor  368 , the RX processor  356 , and/or the controller/processor  359 ) and/or an apparatus (e.g., the apparatus  802 ). According to various aspects, one or more of the illustrated operations may be transposed, omitted, and/or contemporaneously performed. 
     At  602 , the UE may receive each of a set of signals from a base station on at least one channel configured with the base station. Each of the set of signals may be a CSI-RS and/or an SSB. The UE may receive the signals on sets of resources with a single Rx beam of the UE or with multiple Rx beams of the UE. For example, the UE may simultaneously receive resources with either a single spatial domain receive filter or with multiple simultaneous spatial domain receive filters. For example, referring to  FIGS. 4-5 , the UE  404  may receive the signals  526   a - c  from the base station  402  on sets of resources with a single one of the Rx beams  414  or using multiple ones of the Rx beams  414 . According to various aspects, the UE  404  may simultaneously receive CSI-RS and/or SSB resources with either a single spatial domain receive filter or with multiple simultaneous spatial domain receive filters. 
     At  604 , the UE may receive a reporting configuration from the base station. For example, the UE may receive the reporting configuration via one of RRC signaling, a MAC CE, or DCI. The reporting configuration may indicate a metric associated with MIMO communication on the channel, such as a PMI, RI, and/or CQI. Further, the reporting configuration may indicate at least one set of resources on which the UE is to report. In one aspect, the reporting configuration may be a CSI reporting configuration, and may include a group-based beam field that indicates the metric. For example, referring to  FIGS. 4-5 , the UE  404  may receive the reporting configuration  524  from the base station  402 , which may indicate the metric  522 . 
     At  606 , the UE may determine a metric associated with MIMO communication with the base station based on at least one operational state associated with the at least one channel configured with the base station. According to various aspects, the metric may be an RI, PMI, and/or CQI. The metric may be associated with a quantity of sets of resources, such as spatial resources, time resources, and/or frequency resources. For example, the UE may determine that the metric includes a CQI over a plurality of beams or spatial filters. 
     The at least one operational state of the channel may include channel properties (e.g., channel conditions) and/or channel configurations (e.g., a multiplexing scheme configured by the base station on the channel). According to various aspects, the at least one operational state may be one or more of an operational SNR and/or SINR associated with a link between a pair of beams, an effective SNR and/or SINR associated with the channel, an operational RSRP associated with a link between a pair of beams, an effective RSRP associated with the channel, one or more spatial properties of the channel, a link or channel model (e.g., indicating one or more blockages, the environments of the base station and/or the UE, and the like), a link or channel capacity, mutual information, and/or a multiplexing scheme configured for the channel. 
     In some aspects, the base station may implicitly indicate the metric to the UE via the operational state of the channel, and therefore, the UE may determine the metric that corresponds to at least one operational state of the channel configured by the base station, such as by determining a multiplexing scheme configured by the base station for the channel. 
     In some other aspects, the base station may explicitly indicate the metric to the UE, and the metric may have been determined by the base station based on at least one operational state of the channel. For example, the UE may receive a reporting configuration that indicates at least one of the metric or the at least one set of resources corresponding to at least one value of the metric. In another example, the UE may receive information indicating the metric via at least one of RRC signaling, a MAC CE, and/or DCI. In still other aspects, the UE may explicitly or implicitly receive information from the base station that the reconfigures the UE with at least one of a metric or a set of resources that is different from that indicated in a previously received reporting configuration. For example, the UE may receive signaling from the base station that indicates a different metric from that indicated in the reporting configuration, but the at least one set of resources may still remain valid for reporting by the UE. 
     For example, referring to  FIGS. 4-5 , the UE  404  may determine  528  the metric  522  associated with MIMO communication with the base station  402  based on the at least one operational state  420  associated with the channel  410  configured with the base station  402 . In one aspect, the UE  404  may determine  528  the metric  522  based on information received from the base station  402  that explicitly indicates the metric  522 . For example, the UE  404  may receive the reporting configuration  524 , which may include information indicating the metric  522 , as determined by the base station  402  based on the at least one operational state  420  of the channel  410 . In another aspect, the UE  404  may determine  528  the metric  522  based on information received from the base station  402  that implicitly indicates the metric  522 . For example, the UE  404  may determine the at least one operational state  420  of the channel  410 , and the determined at least one operational state  420  may correspond to the metric  522 . 
     At  608 , the UE may determine at least one value of the metric based on at least one signal of the set of signals received from the base station on the channel. The at least one value may correspond to at least one set of resources, such as time, frequency, and/or spatial resources. The UE may determine the at least one value for a quantity, which may be indicated to the UE by the base station and/or may be determined by the UE (e.g., based on the at least one operational state). In one aspect, the UE may determine the at least one value as at least two values, and each of the at least two values may correspond to a respective set of resources. In another aspect, the UE may determine the at least one value as a single value that corresponds to at least two sets of resources. 
     For example, referring to  FIGS. 4-5 , the UE  404  may determine  530  the at least one value  534  based on at least one of the signals  526   a - c  received from the base station  402  on the channel  410 . In one aspect, the UE  404  may determine  530  the at least one value  534  as at least two values based on at least two of the signals  526   a - c  received from the base station  402  on the channel  410 , and each of the at least two values may correspond to a respective set of resources on which a respective one of the at least two of the signals  526   a - c  is received. In another aspect, the UE  404  may determine  530  the at least one value  534  as one value based on at least two of the signals  526   a - c  received from the base station  402  on the channel  410 —e.g., the at least one value  534  may be one value capturing the joint properties of at least two different sets of resources. 
     At  610 , the UE may transmit a report indicating the at least one value of the metric to the base station. For example, the UE may include the at least one value of the metric in a CSI report. In some aspects, the UE may transmit the report in a configured reporting instance and/or on at least one configured reporting resource, such as at least one spatial resource (e.g., a configured beam or TCI state), time resource, and/or frequency resource. For example, referring to  FIGS. 4-5 , The UE  404  may transmit the at least one value  534  of the metric  522  to the base station  402  in the report  532 . 
     At  612 , the UE may receive information indicating a MIMO scheme for communication with the base station in response to transmitting the report indicating the at least one value of the metric. For example, the UE may receive information indicating a TDM, FDM, and/or SDM scheme configured on the channel for MIMO communication with the base station. The UE may communicate with the base station (e.g., receive downlink data and/or control information from the base station) based on the information indicating the MIMO scheme. For example, referring to  FIGS. 4-5 , the UE  404  may receive information from the base station  402  that indicates a MIMO scheme for MIMO communication  538  on the channel  410 . 
       FIG. 7  is a flowchart of a method  700  of wireless communication. The method  700  may be performed by a base station (e.g., the base station  102 / 180 ,  310 ,  402 , which may include the memory  376  and which may be the entire base station  102 / 180 ,  310 ,  402  or a component of the base station  102 / 180 ,  310 ,  402 , such as the TX processor  316 , the RX processor  370 , and/or the controller/processor  375 ) and/or an apparatus (e.g., the apparatus  902 ). According to various aspects, one or more of the illustrated operations may be transposed, omitted, and/or contemporaneously performed. 
     At  702 , the base station may determine a metric associated with MIMO communication with a UE based on at least one operational state associated with at least one channel configured with the UE. According to various aspects, the metric may be an RI, PMI, and/or CQI. The metric may be associated with a quantity of sets of resources, such as spatial resources, time resources, and/or frequency resources. For example, the base station may determine that the metric includes a CQI over a plurality of beams or spatial filters. 
     The at least one operational state of the channel may include channel properties (e.g., channel conditions) and/or channel configurations (e.g., a multiplexing scheme configured by the base station on the channel). According to various aspects, the at least one operational state may be one or more of an operational SNR and/or SINR associated with a link between a pair of beams, an effective SNR and/or SINR associated with the channel, an operational RSRP associated with a link between a pair of beams, an effective RSRP associated with the channel, one or more spatial properties of the channel, a link or channel model (e.g., indicating one or more blockages, the environments of the base station and/or the UE, and the like), a link or channel capacity, mutual information, and/or a multiplexing scheme configured for the channel. 
     For example, referring to  FIGS. 4-5 , the base station  402  may determine  520  the metric  522  associated with MIMO communication with the UE  404  based on the at least one operational state  420  associated with the channel  410  configured with the UE  404 . 
     At  704 , the base station may transmit a reporting configuration to the UE. According to various aspects, the reporting configuration may indicate at least one of the metric and/or at least one set of resources. Potentially, the at least one set of resources may be associated with the metric. In some aspects, the reporting configuration may be associated with CSI reporting by the UE—for example, the reporting configuration may configure the UE with a type, contents, and/or periodicity associated with one or more CSI reports to be transmitted by the UE to the base station. For example, referring to  FIGS. 4-5 , the base station  402  may transmit the reporting configuration  524  to the UE  404  on one or more sets of resources. The reporting configuration  524  may be a CSI reporting configuration, and the base station  402  may include the metric  522  in a field associated with a group-based beam reporting. 
     At  706 , the base station may transmit each of a set of signals to a UE on at least one channel configured with the UE. Each of the set of signals may be a CSI-RS and/or an SSB. The base station may transmit the signals on sets of resources with a Tx beams of the base station, which may be paired with corresponding Rx beams of the UE. For example, referring to  FIGS. 4-5 , the base station  402  may transmit the signals  526   a - c  to the UE  404  on sets of resources. Each of the signals  526   a - c  may be transmitted with a respective one of the Tx beams  412 , which may be paired with a corresponding one of the Rx beams  414  of the UE  404 . 
     At  708 , the base station may transmit information indicating the metric to the UE. In some aspects, the base station may implicitly indicate the metric to the UE via the operational state of the channel. For example, the base station may configure at least one operational state (e.g., multiplexing scheme) of the channel, and the metric may correspond to at least one operational state of the channel configured by the base station. In some other aspects, the base station may explicitly indicate the metric to the UE in the reporting configuration, which may include information indicating a quantity of sets of resources on which at least one value of the metric is to be based. In one aspect, the reporting configuration may be a CSI reporting configuration, and may include a group-based beam field that indicates the metric and the quantity associated with the metric. The base station may transmit the reporting configuration to the UE via one of RRC signaling, a MAC CE, or DCI. 
     In some other aspects, the base station may explicitly or implicitly transmit information to the UE that the reconfigures the UE with at least one of a metric or a set of resources that is different from that indicated in a previously transmitted reporting configuration. For example, the base station may transmit signaling to the UE that indicates a different metric from that indicated in the previously transmitted reporting configuration, but the at least one set of resources may still remain valid for reporting by the UE. 
     For example, referring to  FIGS. 4-5 , the base station  402  may transmit information indicating the metric  522  to the UE  404 . In one aspect, the base station  402  may transmit the reporting configuration  524  to the UE  404 , which may indicate the metric  522 . In another aspect, the base station  402  may configure the at least one operational state  420  of the channel  410 , which may implicitly indicate the metric  522  to the UE  404 . Potentially, the base station  402  may configure the at least one operational state  420  of the channel  410  to indicate a quantity associated with the metric  522 . 
     At  710 , the base station may receive, from the UE, a report that indicates at least one value of the metric based on at least one signal of the set of signals transmitted to the UE on the channel. For example, the base station may receive the at least one value of the metric in a CSI report from the UE. In some aspects, the base station may receive the report in a configured reporting instance and/or on at least one configured reporting resource, such as at least one spatial resource (e.g., a configured beam or TCI state), time resource, and/or frequency resource. 
     The at least one value may correspond to at least one set of resources, such as time, frequency, and/or spatial resources. In one aspect, the at least one value may include at least two values, and each of the at least two values may correspond to a respective set of resources. In another aspect, the at least one value may include a single value that corresponds to at least two sets of resources. In other words, the at least one value may correspond to a quantity of sets of resources, which may be the same or different as the quantity indicated to the UE in the information indicating the metric. For example, the quantity associated with the at least one value received from the UE may indicate the UE preferred Tx/Rx mode. 
     For example, referring to  FIGS. 4-5 , the base station  402  may receive, from the UE  404 , the report  532  indicating the at least one value  534  of the metric  522  based on at least one of the signals  526   a - c  transmitted to the UE  404  on the channel  410 . For example, the at least one value  534  may be one value capturing the joint properties of at least two different sets of resources. 
     At  712 , the base station may configure a MIMO scheme for communication with the UE on the channel based on the at least one value of the metric received in the report. For example, the base station may configure a TDM, FDM, and/or SDM scheme on the channel for MIMO communication with the UE. The base station may communicate with the UE (e.g., transmit downlink data and/or control information to the UE) according to the configured MIMO scheme. For example, referring to  FIGS. 4-5 , the base station  402  may configure  536  a MIMO scheme for MIMO communication  538  with the UE  404  on the channel  410 . 
       FIG. 8  is a diagram  800  illustrating an example of a hardware implementation for an apparatus  802 . The apparatus  802  is a UE and includes a cellular baseband processor  804  (also referred to as a modem) coupled to a cellular RF transceiver  822  and one or more subscriber identity modules (SIM) cards  820 , an application processor  806  coupled to a secure digital (SD) card  808  and a screen  810 , a Bluetooth module  812 , a wireless local area network (WLAN) module  814 , a Global Positioning System (GPS) module  816 , and a power supply  818 . The cellular baseband processor  804  communicates through the cellular RF transceiver  822  with the UE  104  and/or BS  102 / 180 . The cellular baseband processor  804  may include a computer-readable medium/memory. The computer-readable medium/memory may be non-transitory. The cellular baseband processor  804  is responsible for general processing, including the execution of software stored on the computer-readable medium/memory. The software, when executed by the cellular baseband processor  804 , causes the cellular baseband processor  804  to perform the various functions described supra. The computer-readable medium/memory may also be used for storing data that is manipulated by the cellular baseband processor  804  when executing software. The cellular baseband processor  804  further includes a reception component  830 , a communication manager  832 , and a transmission component  834 . The communication manager  832  includes the one or more illustrated components. The components within the communication manager  832  may be stored in the computer-readable medium/memory and/or configured as hardware within the cellular baseband processor  804 . The cellular baseband processor  804  may be a component of the UE  350  and may include the memory  360  and/or at least one of the TX processor  368 , the RX processor  356 , and the controller/processor  359 . In one configuration, the apparatus  802  may be a modem chip and include just the baseband processor  804 , and in another configuration, the apparatus  802  may be the entire UE (e.g., see  350  of  FIG. 3 ) and include the aforediscussed additional modules of the apparatus  802 . 
     The reception component  830  may receive each of a set of signals from the base station  102 / 180  on at least one channel configured with the base station  102 / 180 , e.g., as described in connection with  602  of  FIG. 6 . The set of signals may include, for example, a set of SS/PBCH blocks and/or a set of CSI-RSs. In some aspects, at least one of the set of signals may be received via a single spatial domain receive filter or simultaneously received via multiple spatial domain receive filters. In some other aspects, at least one of the set of signals may be received via one of a single Rx beam of the apparatus  802  or a plurality of Rx beams of the apparatus  802 . For example, at least one Rx beam of the apparatus  802  may be paired with at least one Tx beam of the base station  102 / 180 , which may form a beam pair link, e.g., for communication on the channel  410 . Potentially, multiple beam pair links may be configured between the apparatus  802  and the base station  102 / 180 . 
     The reception component  830  may receive a reporting configuration from the base station  102 / 180 , e.g., as described in connection with  604  of  FIG. 6 . For example, the communication manager  832  may include a reporting configuration component  840  that obtains at least one input from the reception component  830  based on the reporting configuration, and the reporting configuration component  840  may configure at least one report of at least one value of at least one metric for transmission to the base station  102 / 180  based on the input from the reception component  830 . The reporting configuration may indicate at least one of the metric or at least one set of resources corresponding to the at least one value of the metric. 
     The communication manager  832  may further include an operational state component  842  that may configure an operational state of the apparatus  802 , and the operational state may be associated with the at least one channel. For example, the operational state component  842  may configure the operational state of the apparatus  802  based on information received from the base station  102 / 180  that configures the operational state of the apparatus  802 . Such information may be received from the base station  102 / 180  via one of RRC signaling, a MAC CE, and/or DCI. 
     The operational state associated with the at least one channel may include at least one of an operational SNR associated with a beam pair link (e.g., a Tx beam of the base station  102 / 180  paired with a Rx beam of the apparatus  802 ), an effective SNR associated with the at least one channel, an operational RSRP associated with the beam pair link, an effective RSRP associated with the at least one channel, one or more spatial properties of the at least one channel, a link model, a link capacity, mutual information, and/or a multiplexing scheme. 
     The communication manager  832  may include a MIMO metric component  844  that is configured to determine a metric associated with MIMO communication with the base station  102 / 180  based on at least one operational state associated with at least channel configured with the base station  102 / 180 , e.g., as described in connection with  606  of  FIG. 6 . For example, the metric may include at least one of a CQI, a PMI, and/or an RI. 
     In some aspects, the reception component  830  may receive information from the base station  102 / 180  via one of RRC signaling, a MAC CE, and/or DCI, and the MIMO metric component  844  may obtain input(s) from the reception component  830  based on the information received from the base station  102 / 180  via the one of RRC signaling, a MAC CE, and/or DCI. The MIMO metric component  844  may determine the metric associated with MIMO communication with the base station  102 / 180  further based on the information received from the base station  102 / 180  via the one of RRC signaling, a MAC CE, and/or DCI. 
     In some other aspects, the MIMO metric component  844  may obtain input(s) from the operational state component  842 . The MIMO metric component  844  may determine the metric associated with MIMO communication with the base station  102 / 180  further based on the at least one operational state, e.g., as obtained from the operational state component  842 . For example, the at least one operational state may implicitly indicate the metric, and therefore, the MIMO metric component  844  may determine the metric associated with MIMO communication with the base station  102 / 180  further based on the implicit indication of the at least one operational state. 
     In some further aspects, the MIMO metric component  844  may obtain input(s) from the reporting configuration component  840 . The MIMO metric component  844  may determine the metric associated with MIMO communication with the base station  102 / 180  further based on the reporting configuration, e.g., as obtained from the reporting configuration component  840 . 
     The communication manager  832  may further include a valuation component  846  that obtains input(s) from the reception component  830  based on the received set of signals, and the valuation component  846  may be configured to determine at least one value of the metric based on at least one of the set of signals received from the base station  102 / 180  on the at least one channel, e.g., as described in connection with  608  of  FIG. 6 . The at least one value may correspond to at least one set of resources—e.g., at least one set of resources associated the channel. Potentially, the at least one value may correspond to at least two sets of resources. 
     The at least one set of resources may include at least one set of spatial resources, at least one set of time resources, and/or at least one set of frequency resources. In some aspects, the at least one set of resources may be indicated by the reporting configuration, e.g., as provided by the reporting configuration component  840 . 
     In some aspects, the at least one value may include at least two values and the at least one set of resources may include at least two sets of resources, and each of the at least two values may correspond to a respective one of the at least two sets of resources. For example, the valuation component  846  may determine each of the at least two values, e.g., for the same metric or for a respective one of at least two metrics. In some aspects, the determined metric may be different from another metric indicated in the reporting configuration, e.g., as provided by the reporting configuration component  840 , and the at least one set of resources corresponding to the at least one value of the determined metric is different from another set of resources indicating in the reporting configuration, e.g., as provided by the reporting configuration component  840 . 
     Illustratively, the valuation component  846  may determine a first value corresponding to a first set of resources for a CQI metric at least based on a first signal, and further, the valuation component  846  may determine a second value corresponding to a second set of resources for a CQI metric at least based on a second signal. The first and second sets of resources may be the same set of resources or may be different sets of resources, and the first and second signals may be the same signal or may be different signals. 
     The transmission component  834  may obtain input(s) from the valuation component  846 , e.g., based on the at least one value of the metric. The transmission component  834  may be configured to transmit a report indicating the at least one value of the metric to the base station  102 / 180 , e.g., as described in connection with  610  of  FIG. 6 . 
     The reception component  830  may be configured to receive information indicating a MIMO scheme for the MIMO communication with the base station  102 / 180  in response to transmitting the report indicating the at least one value of the metric, e.g., as described in connection with  612  of  FIG. 6 . The apparatus  802  may then communicate with the base station  102 / 180  based on the MIMO scheme for MIMO communication, e.g., on the at least one channel. 
     The apparatus may include additional components that perform some or all of the blocks of the algorithms in the aforementioned call flow diagram of  FIG. 5  and/or flowchart of  FIG. 6 . As such, some of all of the blocks in the aforementioned call flow diagram of  FIG. 5  and/or flowchart of  FIG. 6  may be performed by a component and the apparatus may include one or more of those components. The components may be one or more hardware components specifically configured to carry out the stated processes/algorithm, implemented by a processor configured to perform the stated processes/algorithm, stored within a computer-readable medium for implementation by a processor, or some combination thereof. 
     In one configuration, the apparatus  802 , and in particular the cellular baseband processor  804 , includes means for determining a metric associated with MIMO communication with a base station based on at least one operational state associated with at least one channel configured with the base station; means for determining at least one value of the metric based on at least one of a set of signals received from the base station on the at least one channel, the at least one value corresponding to at least one set of resources; and means for transmitting a report indicating the at least one value of the metric to the base station. 
     In one aspect, the apparatus  802 , and in particular the cellular baseband processor  804 , may further include means for receiving a reporting configuration from the base station, and the reporting configuration indicates at least one of the metric or the at least one set of resources corresponding to the at least one value of the metric. 
     In one aspect, the metric is determined based on information received from the base station via one of RRC signaling, a MAC CE, or DCI. In one aspect, at least one of: the metric is different from another metric indicated in the reporting configuration, or the at least one set of resources corresponding to the at least one value of the metric is different from another set of resources indicated in the reporting configuration. 
     In one aspect, the apparatus  802 , and in particular the cellular baseband processor  804 , may further include means for receiving each of the set of signals from the base station on the at least one channel, and each of the set of signals comprises at least one of an SS/PBCH block or a CSI-RS. In one aspect, the at least one of the set of signals is received via one of a single Rx beam of the apparatus  802  or a plurality of Rx beams of the apparatus  802 . In one aspect, at least one of the set of signals may be received via a single spatial domain receive filter or simultaneously received via multiple spatial domain receive filters. 
     In one aspect, the at least one operational state associated with the at least one channel comprises at least one of an operational SNR associated with a beam pair link, an effective SNR associated with the at least one channel, an operational RSRP associated with the beam pair link, an effective RSRP associated with the at least one channel, one or more spatial properties of the at least one channel, a link model, a link capacity, mutual information, or a multiplexing scheme. In one aspect, the at least one operational state is configured by the base station, and the metric is implicitly indicated via the at least one operational state. 
     In one aspect, the metric comprises at least one of a CQI, a PMI, or a RI. In one aspect, the at least one value comprises at least two values and the at least one set of resources comprises at least two sets of resources, and wherein each of the at least two values corresponds to a respective one of the at least two sets of resources. In one aspect, the at least one value comprises one value that corresponds to at least two sets of resources. In one aspect, the at least one set of resources comprises at least one set of spatial resources, time resources, or frequency resources. 
     In one aspect, the apparatus  802 , and in particular the cellular baseband processor  804 , may further include means for receiving information indicating a MIMO scheme for the MIMO communication with the base station in response to transmitting the report indicating the at least one value of the metric. 
     The aforementioned means may be one or more of the aforementioned components of the apparatus  802  configured to perform the functions recited by the aforementioned means. As described supra, the apparatus  802  may include the TX Processor  368 , the RX Processor  356 , and the controller/processor  359 . As such, in one configuration, the aforementioned means may be the TX Processor  368 , the RX Processor  356 , and the controller/processor  359  configured to perform the functions recited by the aforementioned means. 
       FIG. 9  is a diagram  900  illustrating an example of a hardware implementation for an apparatus  902 . The apparatus  902  is a BS and includes a baseband unit  904 . The baseband unit  904  may communicate through a cellular RF transceiver with the UE  104 . The baseband unit  904  may include a computer-readable medium/memory. The baseband unit  904  is responsible for general processing, including the execution of software stored on the computer-readable medium/memory. The software, when executed by the baseband unit  904 , causes the baseband unit  904  to perform the various functions described supra. The computer-readable medium/memory may also be used for storing data that is manipulated by the baseband unit  904  when executing software. The baseband unit  904  further includes a reception component  930 , a communication manager  932 , and a transmission component  934 . The communication manager  932  includes the one or more illustrated components. The components within the communication manager  932  may be stored in the computer-readable medium/memory and/or configured as hardware within the baseband unit  904 . The baseband unit  904  may be a component of the base station  310  and may include the memory  376  and/or at least one of the TX processor  316 , the RX processor  370 , and the controller/processor  375 . 
     The communication manager  932  may further include an operational configuration component  940  that may configure an operational state of the UE  104 . The operational state may be associated with at least one channel configured between the apparatus  902  and the UE  104 . According to various aspects, the operational state associated with the at least one channel may include at least one of an operational SNR associated with a beam pair link (e.g., a Tx beam of the apparatus  902  paired with a Rx beam of the UE  104 ), an effective SNR associated with the at least one channel, an operational RSRP associated with the beam pair link, an effective RSRP associated with the at least one channel, one or more spatial properties of the at least one channel, a link model, a link capacity, mutual information, and/or a multiplexing scheme. The operational configuration component  940  may configure the UE  104  with the operational state by transmitting information to the UE  104 , e.g., through the transmission component  934 , via at least one of RRC signaling, a MAC CE, and/or DCI. 
     The communication manager  932  may further include a metric determination component  942  that may be configured to determine a metric associated with MIMO communication with the UE  104  based on at least one operational state associated with at least one channel configured with the UE  104 , e.g., as described in connection with  702  of  FIG. 7 . The metric may include at least one of a CQI, a PMI, and/or an RI. The metric may correspond to at least one value of the metric (e.g., at least one CQI value(s), PMI value(s), and/or RI value(s)) to be reported by the UE  104 , and the at least one value may be associated with at least one set of resources. For example, the at least one set of resources may include at least one set of spatial resources, at least one set of time resources, and/or at least one set of frequency resources. 
     The communication manager  932  may further include a reporting configuration component  944  that may configure reporting by the UE  104 . For example, the reporting configuration component  944  may configure CSI reporting by the UE  104 . The reporting configuration component  944  may provide input(s) to the transmission component  934  associated with configuring reporting by the UE  104 . Accordingly, the transmission component  934  may be configured to transmit a reporting configuration to the UE  104 , e.g., as described in connection with  704  of  FIG. 7 . According to various aspects, the reporting configuration may include information indicating at least one of the metric (e.g., associated with reporting by the UE  104 ) and/or at least one set of resources (e.g., corresponding to at least one value of a metric to be reported by the UE  104 ). 
     In some aspects, the metric determined by the metric determination component  942  may be different from the metric indicated in the reporting configuration configured by the reporting configuration component  944  and/or the at least one set of resources corresponding to the at least one value of the metric to be reported by the UE  104  may be different from the at least one set of resources indicated in the reporting configuration configured by the reporting configuration component  944 . 
     The transmission component  934  may be configured to transmit each of a set of signals to the UE  104  on at least one channel, e.g., as described in connection with  706  of  FIG. 7 . The set of signals may include at least one of an SS/PBCH block and/or a CSI-RS. 
     The transmission component  934  may be further configured to transmit information indicating the metric to the UE  104 , e.g., as described in connection with  708  of  FIG. 7 . In some aspects, the transmission component  934  may transmit the information indicating the metric to the UE  104  via at least one of RRC signaling, a MAC CE, and/or DCI. In some other aspects, the at least one operational state (e.g., with which the UE  104  is configured) may implicitly indicate the metric to the UE  104 . In still other aspects, the metric may be indicated by the reporting configuration. 
     The reception component  930  may be configured to receive, from the UE  104 , a report indicating at least one value of the metric based on at least one of the set of signals transmitted to the UE  104  on the at least one channel, e.g., as described in connection with  710  of  FIG. 7 . As indicated, the at least one value may correspond to at least one set of resources (e.g., time, frequency, and/or spatial resources). In some aspects, the at least one value includes at least two values and the at least one set of resources includes at least two sets of resources, and each of the at least two values corresponds to a respective one of the at least two sets of resources. In some other aspects, the at least one value includes one value that corresponds to at least two sets of resources. The report received from the UE  104  may be based on the reporting configuration transmitted to the UE  104 . 
     The communication manager  932  may further include a component a MIMO scheme component  946  that obtains input(s) from the reception component  930  based on the at least one value of the metric corresponding to the at least one set of resources. The MIMO scheme component  946  may configure a MIMO scheme for MIMO communication with the UE  104  based on the at least one value of the metric, e.g., as described in connection with  712  of  FIG. 7 . For example, the transmission component  934  may obtain input(s) from the MIMO scheme component  946  based on the configured MIMO scheme, and the transmission component  934  may transmit information to the UE  104  that configures the UE  104  with the MIMO scheme for MIMO communication with the apparatus  902 . The apparatus  902  may then communicate with the UE  104  based on the MIMO scheme for MIMO communication, e.g., on the at least one channel. 
     The apparatus may include additional components that perform some or all of the blocks of the algorithms in the aforementioned call flow diagram of  FIG. 5  and/or flowchart of  FIG. 7 . As such, some of all of the blocks in the aforementioned call flow diagram of  FIG. 5  and/or flowchart of  FIG. 7  may be performed by a component and the apparatus may include one or more of those components. The components may be one or more hardware components specifically configured to carry out the stated processes/algorithm, implemented by a processor configured to perform the stated processes/algorithm, stored within a computer-readable medium for implementation by a processor, or some combination thereof. 
     In one configuration, the apparatus  902 , and in particular the baseband unit  904 , includes means for determining a metric associated with MIMO communication with a UE based on at least one operational state associated with at least one channel configured with the UE; means for transmitting information indicating the metric to the UE; and means for receiving, from the UE, a report indicating at least one value of the metric based on at least one of a set of signals transmitted to the UE on the at least one channel, the at least one value corresponding to at least one set of resources. 
     In one aspect, the apparatus  902 , and in particular the baseband unit  904 , may further include means for transmitting a reporting configuration to the UE, and the reporting configuration indicates at least one of the metric or the at least one set of resources corresponding to the at least one value of the metric. 
     In one aspect, at least one of: the metric is different from another metric indicated in the reporting configuration, or the at least one set of resources corresponding to the at least one value of the metric is different from another set of resources indicated in the reporting configuration. In one aspect, the information indicating the metric is transmitted via one of RRC signaling, a MAC CE, or DCI. 
     In one aspect, the apparatus  902 , and in particular the baseband unit  904 , may further include means for transmitting each of the set of signals to the UE on the at least one channel, and each of the set of signals comprises at least one of a SS/PBCH block or a CSI-RS. 
     In one aspect, the at least one operational state associated with the at least one channel comprises at least one of an operational SNR associated with a beam pair link, an effective SNR associated with the at least one channel, an operational RSRP associated with the beam pair link, an effective RSRP associated with the at least one channel, one or more spatial properties of the at least one channel, a link model, a link capacity, mutual information, or a multiplexing scheme. 
     In one aspect, the at least one operational state is configured by the base station, and the at least one operational state implicitly indicates the metric. In one aspect, the metric comprises at least one of a CQI, a PMI, or a RI. 
     In one aspect, the at least one value comprises at least two values and the at least one set of resources comprises at least two sets of resources, and wherein each of the at least two values corresponds to a respective one of the at least two sets of resources. In one aspect, the at least one value comprises one value that corresponds to at least two sets of resources. In one aspect, the at least one set of resources comprises at least one set of spatial resources, time resources, or frequency resources. 
     In one aspect, the apparatus  902 , and in particular the baseband unit  904 , may further include means for configuring a MIMO scheme for the MIMO communication with the UE based on the at least one value of the metric. 
     The aforementioned means may be one or more of the aforementioned components of the apparatus  902  configured to perform the functions recited by the aforementioned means. As described supra, the apparatus  902  may include the TX Processor  316 , the RX Processor  370 , and the controller/processor  375 . As such, in one configuration, the aforementioned means may be the TX Processor  316 , the RX Processor  370 , and the controller/processor  375  configured to perform the functions recited by the aforementioned means. 
     It is understood that the specific order or hierarchy of blocks in the processes/flowcharts disclosed is an illustration of example approaches. Based upon design preferences, it is understood that the specific order or hierarchy of blocks in the processes/flowcharts may be rearranged. Further, some blocks may be combined or omitted. The accompanying method claims present elements of the various blocks in a sample order, and are not meant to be limited to the specific order or hierarchy presented. 
     The previous description is provided to enable any 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 intended to be limited to the aspects shown herein, but is to be accorded the full scope consistent with the language claims, wherein reference to an element in the singular is not intended to mean “one and only one” unless specifically so stated, but rather “one or more.” The word “exemplary” is used herein to mean “serving as an example, instance, or illustration.” Any aspect described herein as “exemplary” is not necessarily to be construed as preferred or advantageous over other aspects. Unless specifically stated otherwise, the term “some” refers to one or more. Combinations such as “at least one of A, B, or C,” “one or more of A, B, or C,” “at least one of A, B, and C,” “one or more of A, B, and C,” and “A, B, C, or any combination thereof” include any combination of A, B, and/or C, and may include multiples of A, multiples of B, or multiples of C. Specifically, combinations such as “at least one of A, B, or C,” “one or more of A, B, or C,” “at least one of A, B, and C,” “one or more of A, B, and C,” and “A, B, C, or any combination thereof” may be A only, B only, C only, A and B, A and C, B and C, or A and B and C, where any such combinations may contain one or more member or members of A, B, or C. All structural and functional equivalents to the 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 intended to be encompassed by the claims. Moreover, nothing disclosed herein is intended to be dedicated to the public regardless of whether such disclosure is explicitly recited in 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.” 
     The following examples are illustrative only and may be combined with aspects of other embodiments or teachings described herein, without limitation. 
     Example 1 may be a UE configured to determine a metric associated with MIMO communication with a base station based on at least one operational state associated with at least one channel configured with the base station; determine at least one value of the metric based on at least one of a set of signals received from the base station on the at least one channel, the at least one value corresponding to at least one set of resources; and transmit a report indicating the at least one value of the metric to the base station. 
     Example 2 may be the UE of Example 1, and further configured to receive a reporting configuration from the base station, and the reporting configuration indicates at least one of the metric or the at least one set of resources corresponding to the at least one value of the metric. 
     Example 3 may be the UE of Example 2, and the metric is determined based on information received from the base station via one of RRC signaling, a MAC CE, or DCI. 
     Example 4 may be the UE of any of Examples 2 and 3, and the metric is different from another metric indicated in the reporting configuration, or the at least one set of resources corresponding to the at least one value of the metric is different from another set of resources indicated in the reporting configuration. 
     Example 5 may be the UE of any of Examples 1 through 4, further configured to receive each of the set of signals from the base station on the at least one channel, and each of the set of signals comprises at least one of a SS/PBCH block or a CSI-RS. 
     Example 6 may be the UE of Example 5, and the at least one of the set of signals is received via one of a single receive beam of the UE or a plurality of receive beams of the UE. 
     Example 7 may be the UE of Example 5, and the at least one of the set of signals may be received via a single spatial domain receive filter or simultaneously received via multiple spatial domain receive filters. 
     Example 8 may be the UE of any of Examples 1 through 7, and the at least one operational state associated with the at least one channel comprises at least one of an operational SNR associated with a beam pair link, an effective SNR associated with the at least one channel, an operational RSRP associated with the beam pair link, an effective RSRP associated with the at least one channel, one or more spatial properties of the at least one channel, a link model, a link capacity, mutual information, or a multiplexing scheme. 
     Example 9 may be the UE of any of Examples 1 through 8, and the at least one operational state is configured by the base station, and the metric is implicitly indicated via the at least one operational state. 
     Example 10 may be the UE of any of Examples 1 through 9, and the metric comprises at least one of a CQI, a PMI, or a RI. 
     Example 11 may be the UE of any of Examples 1 through 10, and the at least one value comprises at least two values and the at least one set of resources comprises at least two sets of resources, and wherein each of the at least two values corresponds to a respective one of the at least two sets of resources. 
     Example 12 may be the UE of any of Examples 1 through 10, and the at least one value comprises one value that corresponds to at least two sets of resources. 
     Example 13 may be the UE of any of Examples 1 through 12, and the at least one set of resources comprises at least one set of spatial resources, time resources, or frequency resources. 
     Example 14 may be the UE of any of Examples 1 through 13, further configured to receive information indicating a MIMO scheme for the MIMO communication with the base station in response to transmitting the report indicating the at least one value of the metric. 
     Example 15 may be a base station configured to determine a metric associated with MIMO communication with a UE based on at least one operational state associated with at least one channel configured with the UE; transmit information indicating the metric to the UE; and receive, from the UE, a report indicating at least one value of the metric based on at least one of a set of signals transmitted to the UE on the at least one channel, the at least one value corresponding to at least one set of resources. 
     Example 16 may be the base station of Example 15, further configured to transmit a reporting configuration to the UE, and the reporting configuration includes information indicating at least one of the metric or the at least one set of resources corresponding to the at least one value of the metric. 
     Example 17 may be the base station of Example 16, and the information indicating the metric is transmitted via one of RRC signaling, a MAC CE, or DCI. 
     Example 18 may be the base station of any of Example 16 and 17, and at least one of: the metric is different from another metric indicated in the reporting configuration, or the at least one set of resources corresponding to the at least one value of the metric is different from another set of resources indicated in the reporting configuration. 
     Example 19 may be the base station of any of Example 15 through 18, further configured to transmit each of the set of signals to the UE on the at least one channel, and each of the set of signals comprises at least one of a SS/PBCH block or a CSI-RS. 
     Example 20 may be the base station of any of Example 15 through 19, and the at least one operational state associated with the at least one channel comprises at least one of an operational SNR associated with a beam pair link, an effective SNR associated with the at least one channel, an operational RSRP associated with the beam pair link, an effective RSRP associated with the at least one channel, one or more spatial properties of the at least one channel, a link model, a link capacity, mutual information, or a multiplexing scheme. 
     Example 21 may be the base station of any of Example 15 through 20, and the at least one operational state is configured by the base station, and the at least one operational state implicitly indicates the metric. 
     Example 22 may be the base station of any of Example 15 through 21, and the metric comprises at least one of a CQI, a PMI, or a RI. 
     Example 23 may be the base station of any of Example 15 through 22, and the at least one value comprises at least two values and the at least one set of resources comprises at least two sets of resources, and wherein each of the at least two values corresponds to a respective one of the at least two sets of resources. 
     Example 24 may be the base station of any of Example 15 through 22, and the at least one value comprises one value that corresponds to at least two sets of resources. 
     Example 25 may be the base station of any of Example 15 through 24, and the at least one set of resources comprises at least one set of spatial resources, time resources, or frequency resources. 
     Example 26 may be the base station of any of Example 15 through 25, further configured to configure a MIMO scheme for the MIMO communication with the UE based on the at least one value of the metric.