Reference signal configuration and quasi co-location mapping for wide bandwidth systems

Abstract

Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a user equipment (UE) can receive a configuration indicating a set of frequency components for carrier aggregation and indicating a plurality of channel state information reference signal (CSI-RS) sets or sounding reference signal (SRS) sets, where different CSI-RS sets or SRS sets of the plurality of CSI-RS sets or SRS sets correspond to different subsets of frequency components included in the set of frequency components. The UE can monitor for one or more CSI-RSs or SRSs corresponding to a subset of frequency components included in the set of frequency components based at least in part on the configuration. Numerous other aspects are provided.

Description

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This Patent Application claims priority to U.S. Patent Application No. 63 / 057,621, filed July 28, 2020, entitled “REFERENCE SIGNAL CONFIGURATION AND QUASI CO-LOCATION MAPPINGS FOR WIDE BANDWIDTH SYSTEMS,” and U.S. Nonprovisional Patent Application No. 17 / 305,789, filed July 14, 2021, entitled “REFERENCE SIGNAL CONFIGURATION AND QUASI CO-LOCATION MAPPINGS FOR WIDE BANDWIDTH SYSTEMS,” which are hereby expressly incorporated by reference herein.

[0003] DISCLOSURE

[0004] Aspects of the present disclosure generally relate to wireless communication and to techniques and apparatuses for reference signal configuration and quasi co-location mappings for wide bandwidth systems.

[0005] BACKGROUND

[0006] Wireless communication systems are widely deployed to provide various telecommunication services such as telephony, video, data, messaging, and broadcasts. Typical wireless communication systems can employ multiple-access technologies capable of supporting communication with multiple users by sharing available system resources (e.g., bandwidth, transmit power, etc.). 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, time division synchronous code division multiple access (TD-SCDMA) systems, and Long Term Evolution (LTE). LTE / LTE-Advanced is a set of enhancements to the Universal Mobile Telecommunications System (UMTS) mobile standard promulgated by the Third Generation Partnership Project (3 GPP).

[0007] A wireless network can include a number of base stations (BSs) that can support communication for a number of user equipment (UEs). A UE can communicate with a BS via the downlink and uplink. “Downlink” (or “forward link”) refers to the communication link from the BS to the UE, and “uplink” (or “reverse link”) refers to the communication link from the UE to the BS. As will be described in more detail herein, a BS can be referred to as a Node B, a gNB, an access point (AP), a radio head, a transmit receive point (TRP), a new radio (NR) BS, a 5G Node B, and / or the like.

[0008] The above multiple access technologies have been adopted in various telecommunication standards to provide common protocols that enable different user equipment to communicate on the same physical frequency channel. NR, which can also be referred to as 5G, is a set of enhancements to the LTE mobile standard promulgated by 3GPP. NR is designed to better support mobile broadband Internet access by improving spectral efficiency, lowering costs, improving services, making use of new spectrum, and better integrating with other open standards using OFDM with a cyclic prefix (CP) (CP-OFDM) on the downlink (DL), using CP- OFDM and / or SC-FDM (e.g., also known as discrete Fourier transform spread orthogonal frequency division multiplexing (DFT-s-OFDM)) on the uplink (UL), as well as supporting beamforming, multiple-input multiple-output (MIMO) antenna technology, and carrier aggregation. However, as the demand for mobile broadband access continues to increase, there exists a need for further improvements in LTE, NR, and other radio access technologies.

[0009] SUMMARY

[0010] In some aspects, a method of wireless communication performed by a user equipment (UE) includes receiving a configuration that indicates a set of frequency components for carrier aggregation and indicates a plurality of sets of channel state information reference signals (CSI-RSs) or sounding reference signals (SRSs), wherein different sets of CSI-RSs or SRSs of the plurality of sets of CSI-RSs or SRSs correspond to different subsets of frequency components included in the set of frequency components; and monitoring one or more CSI-RSs or SRSs corresponding to a subset of frequency components included in the set of frequency components based at least in part on the configuration.

[0011] In some aspects, a method of wireless communication performed by a scheduling entity includes transmitting a configuration indicating a set of frequency components for carrier aggregation and indicating a plurality of sets of CSI-RSs or SRSs, wherein different sets of CSI-RSs or SRSs of the plurality of sets of CSI-RSs or SRSs correspond to different subsets of frequency components included in the set of frequency components; and transmitting one or more CSI-RSs or SRSs corresponding to a subset of frequency components included in the set of frequency components based at least in part on the configuration.

[0012] In some aspects, a UE for wireless communication includes a memory and one or more processors coupled to the memory, the memory and the one or more processors configured to receive a configuration indicating a set of frequency components for carrier aggregation and indicating a plurality of sets of CSI-RSs or SRSs, wherein different sets of CSI-RSs or SRSs of the plurality of sets of CSI-RSs or SRSs correspond to different subsets of frequency components included in the set of frequency components; and monitor for one or more CSI-RSs or SRSs corresponding to a subset of frequency components included in the set of frequency components based at least in part on the configuration.

[0013] In some aspects, a scheduling entity for wireless communication includes a memory and one or more processors coupled to the memory, the memory and the one or more processors configured to transmit a configuration indicating a set of frequency components for carrier aggregation and indicating a plurality of sets of CSI-RSs or SRSs, wherein different sets of CSI-RSs or SRSs of the plurality of sets of CSI-RSs or SRSs correspond to different subsets of frequency components included in the set of frequency components; and transmit one or more CSI-RSs or SRSs corresponding to a subset of frequency components included in the set of frequency components based at least in part on the configuration.

[0014] In some aspects, a non-transitory computer-readable medium storing a set of instructions for wireless communication includes one or more instructions that, when executed by one or more processors of a UE, cause the UE to receive a configuration indicating a set of frequency components for carrier aggregation and indicating a plurality of sets of CSI-RSs or SRSs, wherein different sets of CSI-RSs or SRSs of the plurality of sets of CSI-RSs or SRSs correspond to different subsets of frequency components included in the set of frequency components; and monitor for one or more CSI-RSs or SRSs corresponding to a subset of frequency components included in the set of frequency components based at least in part on the configuration.

[0015] In some aspects, a non-transitory computer-readable medium storing a set of instructions for wireless communication includes one or more instructions that, when executed by one or more processors of a scheduling entity, cause the scheduling entity to: transmit a configuration indicating a set of frequency components for carrier aggregation and indicating a plurality of sets of CSI-RSs or SRSs, wherein different sets of CSI-RSs or SRSs of the plurality of sets of CSI-RSs or SRSs correspond to different subsets of frequency components included in the set of frequency components; and transmit one or more CSI-RSs or SRSs corresponding to a subset of frequency components included in the set of frequency components based at least in part on the configuration.

[0016] In some aspects, an apparatus for wireless communication includes means for receiving a configuration indicating a set of frequency components for carrier aggregation and indicating a plurality of sets of CSI-RSs or SRSs, wherein different sets of CSI-RSs or SRSs of the plurality of sets of CSI-RSs or SRSs correspond to different subsets of frequency components included in the set of frequency components; and means for monitoring for one or more CSI-RSs or SRSs corresponding to a subset of frequency components included in the set of frequency components based at least in part on the configuration.

[0017] In some aspects, an apparatus for wireless communication includes means for transmitting a configuration indicating a set of frequency components for carrier aggregation and indicating a plurality of sets of CSI-RSs or SRSs, wherein different sets of CSI-RSs or SRSs of the plurality of sets of CSI-RSs or SRSs correspond to different subsets of frequency components included in the set of frequency components; and means for transmitting one or more CSI-RSs or SRSs corresponding to a subset of frequency components included in the set of frequency components based at least in part on the configuration.

[0018] Aspects generally include a method, apparatus, system, computer program product, non-transitory computer-readable medium, user equipment, base station, wireless communication device, and / or processing system as substantially described herein with reference to and as illustrated by the accompanying drawings and specification.

[0019] The foregoing has outlined rather broadly the features and technical advantages of examples according to the disclosure in order that the detailed description that follows can be better understood. Additional features and advantages will be described hereinafter. The disclosed concepts and specific examples can be readily utilized as bases for modifying or designing other structures for carrying out the same purposes of the present disclosure. Such equivalent constructions are not to be regarded as a departure from the scope of the accompanying claims. The illustrative examples disclosed herein are not meant to be limiting but merely to be illustrative and variations and modifications are possible. The features and advantages of the disclosed concepts will become more fully apparent from the following description, appended claims, and accompanying drawings, in which:

[0020] While aspects are described in the context of some examples in the disclosure, those skilled in the art will understand that these aspects can be implemented in many different configurations and scenarios. The technology described herein can be implemented using different platform types, devices, systems, shapes, sizes, and / or packaging arrangements. For example, some aspects can be implemented via integrated chip embodiments or other non-module-component based devices (e.g., end-user devices, vehicles, communication devices, computing devices, industrial equipment, retail / purchasing devices, medical devices, or artificial intelligence-enabled devices). The aspects can be implemented in chip-level components, module-level components, non-module-component level components, non-chip-level components, device-level components, or system-level components. Devices incorporating described aspects and features can include additional components and features for implementation and practice of the claimed and described aspects. For example, transmission and reception of wireless signals can include a number of components for analog and digital purposes (e.g., hardware components including antennas, radio frequency chains, power amplifiers, modulators, buffers, processors, interleavers, adders, or summers). Aspects described herein are intended to be practiced in a wide variety of devices, components, systems, distributed arrangements, or end-user devices of varying size, shape, and constitution. BRIEF DESCRIPTION OF DRAWINGS

[0022] For a more complete understanding of the foregoing features of the present disclosure, reference is made to the more particular description of the aspects turned to in conjunction with the accompanying drawings referenced above. For the purpose of illustration, the drawings provide explanations as to a few aspects of the present disclosure as contemplated by and encompassed within the claimed subject matter. The drawings illustrate the designs, features and concepts pertinent to various exemplary aspects disclosed herein.

[0023] Figure 1 is a diagram illustrating an example of a wireless network, in accordance with the present disclosure.

[0024] Figure 2 is a diagram illustrating an example of a base station in communication with a UE in a wireless network, in accordance with the present disclosure.

[0025] Figure 3 is a diagram illustrating an example beamforming architecture that supports beamforming for millimeter wave (mmW) communications, in accordance with the present disclosure.

[0026] Figure 4 is a diagram illustrating examples of carrier aggregation, in accordance with the present disclosure.

[0027] Figure 5 is a diagram illustrating examples of channel state information reference signal (CSI-RS) beam management procedures, in accordance with the present disclosure.

[0028] Figure 6This is a diagram illustrating an example of using a beam for communication between a base station and a UE according to this disclosure.

[0029] Figure 7 This is a diagram illustrating examples of frequency components within the frequency range according to this disclosure.

[0030] Figure 8 This is a diagram illustrating an example of a reference signal configuration and quasi-coexistence (QCL) mapping associated with a wide bandwidth system according to this disclosure.

[0031] Figure 9 This is a diagram illustrating another example of the reference signal configuration and QCL mapping associated with a wide bandwidth system according to this disclosure.

[0032] Figures 10-11 This is a diagram illustrating an example process associated with reference signal configuration and QCL mapping for wide bandwidth systems according to this disclosure.

[0033] Detailed description

[0034] The various aspects of this disclosure are described more fully below with reference to the accompanying drawings. However, this disclosure may be implemented in many different forms and should not be construed as being limited to any specific structure or function given throughout this disclosure. Rather, these aspects are provided so that this disclosure will be thorough and complete, and will fully convey the scope of this disclosure to those skilled in the art. Based on the teachings herein, those skilled in the art will appreciate that the scope of this disclosure is intended to cover any aspect of this disclosure disclosed herein, whether implemented independently of or in combination with any other aspect of this disclosure. For example, any number of aspects set forth herein may be used to implement an apparatus or method of practice. Furthermore, the scope of this disclosure is intended to cover such apparatus or methods practiced using additional structures, functionalities, or structures and functionalities that complement or supplement the various aspects of this disclosure set forth herein. It should be understood that any aspect of this disclosure disclosed herein may be implemented by one or more elements of the claims.

[0035] Several aspects of a telecommunications system will now be described with reference to various devices and techniques. These devices and techniques will be described in the following detailed description and explained in the accompanying drawings by various blocks, modules, components, circuits, steps, processes, algorithms, etc. (collectively, "elements"). These elements can be implemented using hardware, software, or a combination thereof. Whether such elements are implemented as hardware or software depends on the specific application and the design constraints imposed on the overall system.

[0036] It should be noted that while aspects can be described herein using terminology commonly associated with a 5G or NR radio access technology (RAT), aspects of the present disclosure can be applied to other RATs, such as a 3G RAT, a 4G RAT, and / or a RAT subsequent to 5G (e.g., 6G).

[0037] Figure 1 FIG. 1 is a diagram illustrating an example of a wireless network 100 in accordance with the present disclosure. The wireless network 100 can be or can include elements of a 5G (NR) network and / or a LTE network, among other examples. The wireless network 100 can include a number of base stations 110 (shown as BS 110a, BS 110b, BS 110c, and BS 1 lOd) and other network entities. A base station (BS) is an entity that communicates with user equipment (UE) and can also be referred to as an NR BS, a Node B, a gNB, a 5G node B (NB), an access point, a transmit receive point (TRP), and / or the like. Each BS can provide communication coverage for a particular geographic area. In 3GPP, the term “cell” can refer to a coverage area of a BS and / or a BS subsystem serving the coverage area, depending on the context in which the term is used.

[0038] BSs can be macro BSs, pico BSs, femto BSs, and / or other types of BSs. A macro BS can cover a relatively large geographic area (e.g., 5-10 miles in radius) and can allow unrestricted access to users with service subscriptions. A pico BS can cover a relatively small geographic area (e.g., a sports stadium) and can allow unrestricted access to users with service subscriptions. A femto BS can cover a relatively small geographic area (e.g., a home) and can allow restricted access to users with service subscriptions via a closed subscriber group (CSG). A BS for a macro cell can be referred to as a macro BS. A BS for a pico cell can be referred to as a pico BS. A BS for a femto cell can be referred to as a femto BS or a home BS. In the example shown in FIG. 1, the BS 110a can be a macro BS for the macro cell 102a, the BS 110b can be a pico BS for the pico cell 102b, and the BS 110c can be a femto BS for the femto cell 102c. A BS can support one or multiple (e.g., three) cells. The terms “eNB,” “base station,” “NR BS,” “gNB,” “TRP,” “AP,” “Node B,” “5G NB,” and “cell” can be used interchangeably herein. Figure 1

[0039] ​In some aspects, the cellular cells can not necessarily be stationary, and the geographic area of a cell can move based on the location of a mobile BS. In some aspects, the BSs can be interconnected to one another and / or to one or more other BSs or network nodes (not shown) in the wireless network 100 through various types of backhaul interfaces such as a direct physical connection or a virtual network, using any suitable transport network.

[0040] Wireless network 100 can also include relay stations. A relay station is an entity that can receive a transmission of data from an upstream station (e.g., a BS or a UE) and send a transmission of the data to a downstream station (e.g., a UE or a BS). A relay station can also be a UE that can relay transmissions for other UEs. Figure 1 In the example shown, a relay BS 1 lOd can communicate with macro BS 110a and a UE 120d in order to facilitate communications between the BS 110a and UE 120d. A relay BS can also be referred to as a relay station, a relay base station, a relay, or the like.

[0041] Wireless network 100 can be a heterogeneous network that includes BSs of different types, such as macro BSs, pico BSs, femto BSs, relay BSs, or the like. These different types of BSs can have different transmit power levels, different coverage areas, and different impacts on interference. For example, macro BSs can have a high transmit power level (e.g., 5 to 40 watts) whereas pico BSs, femto BSs, and relay BSs can have relatively lower transmit power levels (e.g., 0.1 to 2 watts).

[0042] A network controller 130 can couple to a set of BSs and can provide coordination and control for these BSs. Network controller 130 can communicate with the BSs via a backhaul. The BSs can also communicate with one another directly or indirectly via a wireless or wireline backhaul.

[0043] The UEs 120 (e.g., 120a, 120b, 120c) can be dispersed throughout the wireless network 100, and each UE can be stationary or mobile. A UE can also be referred to as an access terminal, a terminal, a mobile station, a subscriber unit, a station, etc. A UE can be a cellular phone (e.g., a smart phone), a personal digital assistant (PDA), a wireless modem, a wireless communication device, a handheld device, a laptop computer, a cordless phone, a wireless local loop (WLL) station, a tablet, a camera, a gaming device, a netbook, a smartbook, an ultrabook, a medical device or equipment, biometric sensors / devices, wearable devices (smart watches, smart clothing, smart glasses, smart wrist bands, smart jewelry (e.g., smart ring, smart bracelet)), an entertainment device (e.g., a music or video device, or a satellite radio), a vehicular component or sensor, a smart meter / sensor, industrial manufacturing equipment, a global positioning system device, or any other suitable device that is configured to communicate via a wireless or wired medium.

[0044] Some UEs can be considered machine-type communication (MTC) or evolved or enhanced machine-type communication (eMTC) UEs. MTC and eMTC UEs include, for example, robots, drones, remote devices, sensors, meters, monitors, and / or location tags, that can communicate with a base station, another device (e.g., remote device), or some other entity. A wireless node can provide, for example, connectivity for or to a network (e.g., a wide area network such as the Internet or a cellular network) via a wired or wireless communication link. Some UEs can be considered Internet-of-Things (IoT) devices, and / or can be implemented as NB-IoT (narrowband internet of things) devices. Some UEs can be considered customer premises equipment (CPE). The UEs 120 can be included in a housing that houses components of the UE 120, such as processor components and / or memory components. In some aspects, the processor components and the memory components can be coupled together. For example, the processor components (e.g., one or more processors) and the memory components (e.g., a memory) can be operatively coupled, communicatively coupled, electronically coupled, and / or electrically coupled.

[0045] In general, any number of wireless networks can be deployed in a given geographic area. Each wireless network can support a particular RAT and can operate on one or more frequencies. A RAT can also be referred to as a radio technology, an air interface, etc. A frequency can also be referred to as a carrier, a frequency channel, etc. Each frequency can support a single RAT in a given geographic area in order to avoid interference between wireless networks of different RATs. In some cases, NR or 5G RAT networks can be deployed.

[0046] In some aspects, two or more UEs 120 (e.g., shown as UE 120a and UE 120e) can communicate directly using one or more sidelink channels (e.g., without using a base station 110 as an intermediary to communicate with each other). For example, UE s 120 can communicate using peer-to-peer (P2P) communications, device-to-device (D2D) communications, a vehicle-to-everything (V2X) protocol (e.g., which can include a vehicle-to- vehicle (V2V) protocol or a vehicle-to-infrastructure (V2I) protocol), and / or a mesh network. In this case, the UE 120s can perform scheduling operations, resource selection operations, and / or other operations described elsewhere herein as being performed by the base station 110.

[0047] Devices of wireless network 100 can communicate using the electromagnetic spectrum, which can be subdivided, based on frequency or wavelength, into various classes, bands, channels, and / or the like. For example, devices of wireless network 100 can communicate using an operating band having a first frequency range (FR1), which can span from 410 MHz to 7.125 GHz, and / or can communicate using an operating band having a second frequency range (FR2), which can span from 24.25 GHz to 52.6 GHz. The frequencies between FR1 and FR2 are sometimes referred to as mid-band frequencies. Although a portion of FR1 is greater than 6 GHz, FR1 is often referred to as a “sub-6 GHz” band. Similarly, FR2 is often referred to as a “millimeter wave” band despite being different from the extremely high frequency (EHF) band (30 GHz - 300 GHz) identified by the International Telecommunications Union (ITU) as a “millimeter wave” band. Thus, unless specifically stated otherwise, it will be understood that the term “sub-6 GHz” or the like means frequencies less than 6 GHz, frequencies within FR1, and / or mid-band frequencies (e.g., greater than 7.125 GHz), if used herein. Similarly, unless specifically stated otherwise, it will be understood that the term “millimeter wave” or the like means frequencies within the EHF band, frequencies within FR2, and / or mid-band frequencies (e.g., less than 24.25 GHz), if used herein. It is contemplated that the frequencies included in FR1 and FR2 can be modified, and the techniques described herein are applicable to those modified frequencies ranges.

[0048] As indicated above, Figure 1 are provided as examples. Other examples can differ from what is described with respect to at least one of the Figure 1 described examples.

[0049] Figure 2is a diagram illustrating an example 200 of a base station 110 in communication with a UE 120 in a wireless network 100, in accordance with the present disclosure. The base station 110 can be equipped with T antennas 234a through 234t, and the UE 120 can be equipped with R antennas 252a through 252r, where in general T > 1 and R > 1.

[0050] At the base station 110, a transmit processor 220 can receive data from a data source 212 for one or more UEs, select one or more modulation and coding schemes (MCSs) for each UE based at least in part on channel quality indicators (CQIs) received from the UE, process (e.g., encode and modulate) the data for each UE based at least in part on the MCS(s) selected for the UE, and provide data symbols for all UEs. The transmit processor 220 can also process system information (e.g., for semi-static resource partitioning information (SRPI)) and control information (e.g., CQI requests, grants, and / or upper layer signaling) and provide overhead symbols and control symbols. The transmit processor 220 can also generate reference symbols for reference signals (e.g., a cell-specific reference signal (CRS) or a demodulation reference signal (DMRS)) and synchronization signals (e.g., a primary synchronization signal (PSS) or a secondary synchronization signal (SSS)). A transmit (TX) multiple-input multiple-output (MIMO) processor 230 can perform spatial processing (e.g., precoding) on the data symbols, the control symbols, the overhead symbols, and / or the reference symbols, if applicable, and can provide T output symbol streams to T modulators (MODs) 232a through 232t. Each modulator 232 can process a respective output symbol stream (e.g., for OFDM) to obtain an output sample stream. Each modulator 232 can further process (e.g., convert to analog, amplify, filter, and upconvert) the output sample stream to obtain a downlink signal. T downlink signals from modulators 232a through 232t can be transmitted via T antennas 234a through 234t, respectively.

[0051] At the UE 120, the antennas 252a through 252r can receive the downlink signals from the base station 110 and / or other base stations and can provide received signals to the demodulators (DEMODs) 254a through 254r, respectively. Each demodulator 254 can condition (e.g., filter, amplify, downconvert, and digitize) a received signal to obtain input samples. Each demodulator 254 can further process the input samples (e.g., for OFDM) to obtain received symbols. A MIMO detector 256 can obtain received symbols from all R demodulators 254a through 254r, perform MIMO detection on the received symbols if applicable, and provide detected symbols. A receive processor 258 can process (e.g., demodulate and decode) the detected symbols, provide decoded data for the UE 120 to a data sink 260, and provide decoded control information and system information to a controller / processor 280. The term “controller / processor” can refer to one or more controllers, one or more processors, or combinations thereof. A channel processor can determine reference signal received power (RSRP) parameters, received signal strength indicator (RSSI) parameters, reference signal received quality (RSRQ) parameters, and / or channel quality indicator (CQI) parameters, among other examples. In some aspects, one or more components of UE 120 can be included in a housing 284.

[0052] The network controller 130 can include a communication unit 294, a controller / processor 290, and a memory 292. The network controller 130 can include, for example, one or more devices in a core network. The network controller 130 can communicate with the base station 110 via the communication unit 294.

[0053] Antennas (e.g., antennas 234a through 234t and / or antennas 252a through 252r) can include or be included in one or more antenna panels, antenna groups, antenna element sets, and / or antenna arrays, among other examples. An antenna panel, antenna group, antenna element set, and / or antenna array can include one or more antenna elements. An antenna panel, antenna group, antenna element set, and / or antenna array can include a set of co-planar antenna elements and / or a set of non-co-planar antenna elements. An antenna panel, antenna group, antenna element set, and / or antenna array can include antenna elements within a single housing and / or antenna elements within multiple housings. An antenna panel, antenna group, antenna element set, and / or antenna array can include one or more antenna elements coupled to one or more transmit and / or receive components (such as one or more components of a transceiver 264). Figure 2 An antenna panel, antenna group, antenna element set, and / or antenna array can include one or more antenna elements coupled to one or more transmit and / or receive components (such as one or more components of a transceiver 264).

[0054] On the uplink, at UE 120, a transmit processor 264 can receive and process data from a data source 262 and control information (e.g., for reports comprising RSRP, RSSI, RSRQ, and / or CQI) from controller / processor 280. Transmit processor 264 can also generate reference symbols for one or more reference signals. The symbols from transmit processor 264 can be precoded by a TX MIMO processor 266 if applicable, further processed by modulators 254a through 254r (e.g., for DFT-s-OFDM or CP-OFDM), and transmitted to base station 110. In some aspects, a modulator and a demodulator (e.g., MOD / DEMOD 254) of the UE 120 can be included in a modem of the UE 120. In some aspects, the UE 120 includes a transceiver. The transceiver can include any combination of antenna(s) 252, modulators and / or demodulators 254, MIMO detector 256, receive processor 258, transmit processor 264, and / or TX MIMO processor 266. The transceiver can be used by a processor (e.g., controller / processor 280) and memory 282 to perform any of the methods described herein (for example, as described with reference to Figures 8-11

[0055] At base station 110, the uplink signals from UE 120 and other UEs can be received by antennas 234, processed by demodulators 232, detected by a MIMO detector 236 if applicable, and further processed by a receive processor 238 to obtain decoded data and control information sent by UE 120. Receive processor 238 can provide the decoded data to a data sink 239 and the decoded control information to controller / processor 240. Base station 110 can include communication unit 244 and communicate to network controller 130 via communication unit 244. Base station 110 can include a scheduler 246 to schedule UEs 120 for downlink and / or uplink communications. In some aspects, a modulator and a demodulator (e.g., MOD / DEMOD 232) of the base station 110 can be included in a modem of the base station 110. In some aspects, the base station 110 includes a transceiver. The transceiver can include any combination of antenna(s) 234, modulators and / or demodulators 232, MIMO detector 236, receive processor 238, transmit processor 220, and / or TX MIMO processor 230. The transceiver can be used by a processor (e.g., controller / processor 240) and memory 242 to perform any of the methods described herein (for example, as described with reference to Figures 8-11

[0056] ​​The controller / processor 240 of base station 110, the controller / processor 280 of UE 120, and / or Figure 2 Any other component may perform one or more techniques associated with reference signal configuration and QCL mapping for wide-bandwidth systems, as described in more detail elsewhere herein. For example, the controller / processor 240 of base station 110, the controller / processor 280 of UE 120, and / or Figure 2 Any other component that can execute or direct, for example Figure 10 Process 1000 Figure 11 The operation of process 1100 and / or other processes as described herein. Memory 242 and 282 may store data and program code for base station 110 and UE 120, respectively. In some aspects, memory 242 and / or memory 282 may include: a non-transitory computer-readable medium storing one or more instructions (e.g., code and / or program code) for wireless communication. For example, when executed by one or more processors of base station 110 and / or UE 120 (e.g., direct execution, or execution after compilation, transformation, and / or interpretation), the one or more processors, UE 120, and / or base station 110 may cause the one or more processors, UE 120, and / or base station 110 to perform or direct, for example... Figure 10 Process 1000 Figure 11 The operation of process 1100, and / or other processes described herein. In some aspects, the execution instructions may include run instructions, translate instructions, compile instructions, and / or interpret instructions, etc.

[0057] In some aspects, the UE (e.g., UE 120) may include: means for receiving a configuration indicating a set of frequency components for carrier aggregation and indicating a plurality of CSI-RS sets or SRS sets, wherein different CSI-RS sets or SRS sets in the plurality of CSI-RS sets or SRS sets correspond to different subsets of frequency components included in the frequency component set; means for monitoring one or more CSI-RS or SRSs corresponding to the subsets of frequency components included in the frequency component set, at least in part based on the configuration; and so on. In some aspects, such means may include a combination of Figure 2 One or more components of the described UE 120, such as controller / processor 280, transmit processor 264, TX MIMO processor 266, MOD 254, antenna 252, DEMOD 254, MIMO detector 256, receive processor 258, etc.

[0058] In some aspects, a scheduling entity (e.g., a base station 110, an integrated access and backhaul (IAB) node, etc.) can include means for transmitting a configuration indicating a set of frequency components for carrier aggregation and indicating a plurality of sets of CSI-RSs or SRSs, wherein different sets of CSI-RSs or SRSs of the plurality of sets of CSI-RSs or SRSs correspond to different subsets of frequency components included in the set of frequency components; means for transmitting, based at least in part on the configuration, one or more CSI-RSs or SRSs corresponding to a subset of frequency components included in the set of frequency components; and / or the like. In some aspects, such means can include one or more components of base station 110 described in connection with FIG. 14, such as antenna 234, DEMOD 232, MIMO detector 236, receive processor 238, controller / processor 240, transmit processor 220, TX MIMO processor 230, MOD 232, antenna 234, and / or the like. Figure 2 One or more components of the base station 110 described, such as antenna 234, DEMOD 232, MIMO detector 236, receive processor 238, controller / processor 240, transmit processor 220, TX MIMO processor 230, MOD 232, antenna 234, and / or the like.

[0059] Although Figure 2 The blocks in FIG. 14 are illustrated as distinct components, but the functionality described above in relation to these blocks can be implemented in a single hardware, software, or combined component or a combination of various components. For example, the functionality described in relation to transmit processor 264, receive processor 258, and / or TX MIMO processor 266 can be performed by or under the control of controller / processor 280.

[0060] As indicated above, Figure 2 are provided by way of example. Other examples can differ from what is described in relation to Figure 2 the examples described in relation to

[0061] Figure 3 is a diagram illustrating an example beamforming architecture 300 that supports beamforming for millimeter wave (mmW) communications in accordance with the present disclosure. In some aspects, the architecture 300 can implement aspects of wireless network 100. In some aspects, the architecture 300 can be implemented in a transmitting device (e.g., a first wireless communication device, a UE, or a base station) and / or a receiving device (e.g., a second wireless communication device, a UE, or a base station), as described herein.

[0062] Broadly, Figure 3is a diagram of example hardware components of a wireless communication device that illustrates certain aspects of the present disclosure. The illustrated components can include those that can be used for antenna element selection and / or for beamforming for wireless signal transmission. There are numerous architectures for antenna element selection and implementing phase shifts, only one example of which is illustrated here. The architecture 300 includes a modem (modulator / demodulator) 302, a digital-to-analog converter (DAC) 304, a first mixer 306, a second mixer 308, and a splitter 310. The architecture 300 also includes a plurality of first amplifiers 312, a plurality of phase shifters 314, a plurality of second amplifiers 316, and an antenna array 318 including a plurality of antenna elements 320. In some examples, the modem 302 can be the modem 232 or the modem 254 described above. Figure 2 One or more of the described modems 232 or modems 254.

[0063] Transmission lines or other waveguides, wires, and / or traces are shown connecting the various components to illustrate how signals to be transmitted can travel between the components. Reference numbers 322, 324, 326, and 328 indicate regions in the architecture 300 in which different types of signals travel or are processed. Specifically, reference number 322 indicates a region in which digital baseband signals travel or are processed, reference number 324 indicates a region in which analog baseband signals travel or are processed, reference number 326 indicates a region in which analog intermediate frequency (IF) signals travel or are processed, and reference number 328 indicates a region in which analog radio frequency (RF) signals travel or are processed. The architecture also includes a local oscillator A 330, a local oscillator B 332, and a controller / processor 334. In some aspects, the controller / processor 334 corresponds to the controller / processor 240 described above in connection with the base station 110. In some aspects, the controller / processor 334 corresponds to the controller / processor 280 described above in connection with the UE 120. Figure 2 The described processor / processor 240 of the base station and / or the above-described controller / processor 280 of the UE. Figure 2 The described controller / processor 280 of the UE.

[0064] Each of the antenna elements 320 can include one or more sub-elements for radiating or receiving RF signals. For example, a single antenna element 320 can include a first sub-element that is cross-polarized with a second sub-element, which can be used to independently transmit cross-polarized signals. The antenna elements 320 can include patch antennas, dipole antennas, or other types of antennas arranged in a linear pattern, a two-dimensional pattern, or other pattern. The spacing between the antenna elements 320 can be such that signals having a desired wavelength transmitted apart by the antenna elements 320 can interact or interfere (e.g., to form a desired beam). For example, given an expected range of wavelengths or frequencies, the spacing can provide a quarter wavelength, a half wavelength, or other fraction of a wavelength of the spacing between adjacent antenna elements 320 to allow for interaction or interference of signals transmitted by separate antenna elements 320 within the expected range.

[0065] The modem 302 processes and generates digital baseband signals, and can also control operation of the DAC 304, the first and second mixers 306, 308, the splitter 310, the first amplifier 312, the phase shifter 314, and / or the second amplifier 316 to transmit signals via one or more or all of the antenna elements 320. The modem 302 can process signals and control operation in accordance with a communications standard, such as the wireless standards discussed herein. The DAC 304 can convert digital baseband signals received from the modem 302 (and to be transmitted) into analog baseband signals. The first mixer 306 uses a local oscillator A 330 to upconvert the analog baseband signals to analog IF signals within an IF. For example, the first mixer 306 can mix the signals with an oscillating signal generated by the local oscillator A 330 to “move” the baseband analog signals to the IF. In some cases, some processing or filtering (not shown) can occur at the IF. The second mixer 308 uses a local oscillator B 332 to upconvert the analog IF signals to analog RF signals. Similar to the first mixer, the second mixer 308 can mix the signals with an oscillating signal generated by the local oscillator B 332 to “move” the IF analog signals to the RF, or the frequency at which the signals are to be transmitted or received. The modem 302 and / or the controller / processor 334 can adjust the frequency of the local oscillator A 330 and / or the local oscillator B 332 so that a desired IF and / or RF frequency is produced and used to facilitate processing and transmission of signals within a desired bandwidth.

[0066] In the illustrated architecture 300, the signal upconverted by the second mixer 308 is split or duplicated by the splitter 310 into multiple signals. The splitter 310 in the architecture 300 splits the RF signal into multiple identical or nearly identical RF signals. In other examples, any type of signal can be split, including a baseband digital signal, a baseband analog signal, or an IF analog signal. Each of these signals can correspond to an antenna element 320, and the signal travels through or is processed by the amplifiers 312, 316, the phase shifter 314, and / or other elements corresponding to the respective antenna element 320 to be provided to or transmitted by the respective antenna element 320 of the antenna array 318. In one example, the splitter 310 can be an active splitter that is connected to a power source and provides some gain so that the RF signal leaving the splitter 310 is at or greater than the power level of the signal entering the splitter 310. In another example, the splitter 310 is a passive splitter that is not connected to a power source, and the RF signal leaving the splitter 310 can be at a lower power level than the RF signal entering the splitter 310.

[0067] After splitting by splitter 310, the resulting RF signals can enter an amplifier (such as first amplifier 312) or phase shifter 314 corresponding to an antenna element 320. First and second amplifiers 312, 316 are illustrated in dashed lines because in some aspects, one or both of them can not be necessary. In some aspects, both first amplifier 312 and second amplifier 316 are present. In some aspects, both first amplifier 312 and second amplifier 316 are not present. In some aspects, one of the two amplifiers 312, 316 is present, but the other is not. As an example, if splitter 310 is an active splitter, first amplifier 312 can not be used. As a further example, if phase shifter 314 is an active phase shifter that can provide gain, second amplifier 316 can not be used.

[0068] Amplifiers 312, 316 can provide a desired level of positive gain or negative gain. Positive gain (positive dB) can be used to increase the amplitude of the signal for radiation by a particular antenna element 320. Negative gain (negative dB) can be used to decrease the amplitude of the signal for radiation by a particular antenna element and / or to suppress its radiation. Each of amplifiers 312, 316 can be independently controlled (e.g., by modem 302 or controller / processor 334) to provide independent control of gain for each antenna element 320. For example, modem 302 and / or controller / processor 334 can have at least one control line connected to each of splitter 310, first amplifier 312, phase shifter 314, and / or second amplifier 316, which can be used to configure the gain to provide a desired amount of gain for each component and thus each antenna element 320.

[0069] Phase shifters 314 can provide a configurable phase shift or phase offset to the corresponding RF signal to be transmitted. Phase shifters 314 can be passive phase shifters that are not directly connected to a power source. Passive phase shifters can introduce some insertion loss. Second amplifiers 316 can boost the signal to compensate for the insertion loss. Phase shifters 314 can be active phase shifters that are connected to a power source, such that the active phase shifters provide some amount of gain or prevent insertion loss. The setting of each phase shifter 314 is independent, meaning that each phase shifter can be independently set to provide a desired amount of phase shift or the same amount of phase shift or some other configuration. Modem 302 and / or controller / processor 334 can have at least one control line connected to each phase shifter 314, and the at least one control line can be used to configure phase shifters 314 to provide a desired amount of phase shift or phase offset between antenna elements 320.

[0070] In the illustrated architecture 300, the RF signals received by the antenna elements 320 are provided to one or more first amplifiers 356 to boost the signal strength. The first amplifiers 356 can be connected to the same antenna array 318 (e.g., for time division duplex (TDD) operations). The first amplifiers 356 can be connected to different antenna arrays 318. The boosted RF signals are input into one or more phase shifters 354 to provide a configurable phase shift or phase offset for the corresponding received RF signals to enable reception via one or more Rx beams. The phase shifters 354 can be active phase shifters or passive phase shifters. The setting of each phase shifter 354 is independent, which means that each phase shifter can be independently set to provide a desired amount of phase shift or the same amount of phase shift or some other configuration. The modem 302 and / or the controller / processor 334 can have at least one control line connected to each phase shifter 354, and the at least one control line can be used to configure the phase shifters 354 to provide a desired amount of phase shift or phase offset between the antenna elements 320 to enable reception via one or more Rx beams.

[0071] The outputs of the phase shifters 354 can be input to one or more second amplifiers 352 for signal amplification of the phase-shifted received RF signals. The second amplifiers 352 can be individually configured to provide a configured amount of gain. The second amplifiers 352 can be individually configured to provide an amount of gain to ensure that the signals input to the combiner 350 have the same magnitude. The amplifiers 352 and / or 356 are illustrated in dashed lines because they can not be necessary in some aspects. In some aspects, both amplifiers 352 and 356 are present. In another aspect, neither amplifier 352 nor 356 is present. In other aspects, one of the amplifiers 352, 356 is present, but the other is not.

[0072] In the illustrated architecture 300, the signals output by the phase shifters 354 (via the amplifiers 352 when present) are combined in the combiner 350. The combiner 350 in the architecture 300 combines the RF signals into one signal. The combiner 350 can be a passive combiner (e.g., not connected to a power source), which can result in some insertion loss. The combiner 350 can be an active combiner (e.g., connected to a power source), which can result in some signal gain. When the combiner 350 is an active combiner, it can provide a different (e.g., configurable) amount of gain for each input signal so that the input signals have the same magnitude when combined. When the combiner 350 is an active combiner, the combiner 350 can not need the second amplifiers 352 because the active combiner can provide signal amplification.

[0073] The output of the combiner 350 is input to mixers 348 and 346. The mixers 348 and 346 generally use inputs from local oscillators 372 and 370, respectively, to down-convert the received RF signal to produce an intermediate or baseband signal that carries the encoded and modulated information. The outputs of the mixers 348 and 346 are input to an analog-to-digital converter (ADC) 344 for conversion to a digital signal. The digital signal output from the ADC 344 is input to the modem 302 for baseband processing such as decoding, de-interleaving, or similar operations.

[0074] The architecture 300 is presented by way of example only to illustrate an architecture for transmitting and / or receiving signals. In some cases, the architecture 300 and / or each portion of the architecture 300 can be repeated multiple times within the architecture to accommodate or provide any number of RF chains, antenna elements, and / or antenna panels. Moreover, numerous alternative architectures are possible and contemplated. For example, while only a single antenna array 318 is shown, two, three, or more antenna arrays can be included, each with its own respective one or more of amplifiers, phase shifters, splitters, mixers, DACs, ADCs, and / or modems. For example, a single UE can include two, four, or more antenna arrays for transmitting or receiving signals in different physical locations on the UE or in different directions.

[0075] Moreover, mixers, splitters, amplifiers, phase shifters, and other components can be located in different signal type regions (e.g., represented by different ones of the reference numbers 322, 324, 326, 328) in different implementation architectures. For example, splitting of a signal to be transmitted into multiple signals can occur at an analog RF, an analog IF, an analog baseband, or a digital baseband frequency in different examples. Similarly, amplification and / or phase shifting can also occur at different frequencies. For example, in some aspects, one or more of the splitters 310, amplifiers 312, 316, or phase shifters 314 can be located between the DAC 304 and the first mixer 306, or between the first mixer 306 and the second mixer 308. In one example, the functionality of one or more components can be combined into one component. For example, the phase shifter 314 can perform amplification to include or replace the first amplifier 312 and / or the second amplifier 316. As another example, the phase shift can be implemented by the second mixer 308 to eliminate the need for a separate phase shifter 314. This technique is sometimes referred to as local oscillator (LO) phase shifting. In some aspects of this configuration, there can be multiple IF-to-RF mixers within the second mixer 308 (e.g., for each antenna element chain), and the local oscillator B 332 can provide a different local oscillator signal (with a different phase shift) to each IF-to-RF mixer.

[0076] The modem 302 and / or the controller / processor 334 can control one or more of the other components 304 to 372 to select one or more antenna elements 320 and / or to shape a beam for transmission of one or more signals. For example, an antenna element 320 can be individually selected for transmission of a signal (or of each signal) or deselected by controlling the amplitude of one or more corresponding amplifiers, such as the first amplifier 312 and / or the second amplifier 316. Beamforming includes using multiple signals on different antenna elements to generate a beam, where one or more or all of the multiple signals are phase shifted relative to each other. The beam that is formed can carry a physical or higher layer reference signal or information. As each of the multiple signals radiates from a corresponding antenna element 320, the radiated signals interact, interfere (constructive and destructive interference), and amplify each other to form the resulting beam. The shape (such as the amplitude, width, and / or presence of side lobes) and direction (such as the angle of the beam relative to the surface of the antenna array 318) can be dynamically controlled by modifying the phase shift or phase offset imparted by the phase shifters 314 and the amplitude imparted by the amplifiers 312, 316 relative to each other of the multiple signals. The controller / processor 334 can be located partially or entirely within one or more other components of the architecture 300. For example, in some aspects, the controller / processor 334 can be located within the modem 302.

[0077] As indicated above, Figure 3 are provided by way of example. Other examples can differ from those described with respect to Figure 3 the examples described with respect to

[0078] Figure 4 is a diagram illustrating an example 400 of carrier aggregation, in accordance with the present disclosure.

[0079] Carrier aggregation is a technique that enables two or more component carriers (CCs, sometimes referred to as carriers) to be combined (e.g., into a single channel) for a single UE 120 to enhance data capacity. As shown, the carriers can be combined in the same or different frequency bands. Additionally or alternatively, contiguous or non-contiguous carriers can be combined. The base station 110 can configure carrier aggregation for the UE 120 (such as in a radio resource control (RRC) message, downlink control information (DCI), and / or the like).

[0080] As shown by reference number 405, in some aspects, carrier aggregation can be configured in an intra-band contiguous mode, where the aggregated carriers are contiguous to each other and in the same frequency band. As shown by reference number 410, in some aspects, carrier aggregation can be configured in an intra-band non-contiguous mode, where the aggregated carriers are not contiguous to each other and in the same frequency band. As shown by reference number 415, in some aspects, carrier aggregation can be configured in an inter-band non-contiguous mode, where the aggregated carriers are not contiguous to each other and in different frequency bands.

[0081] In carrier aggregation, a UE 120 can be configured with a primary carrier and one or more secondary carriers. In some aspects, the primary carrier can carry control information (e.g., downlink control information, scheduling information, etc.) for scheduling data communications on the one or more secondary carriers, which can be referred to as cross-carrier scheduling. In some aspects, a carrier (e.g., a primary carrier or a secondary carrier) can carry control information for scheduling data communications on that carrier, which can be referred to as self-carrier scheduling or carrier self-scheduling.

[0082] As indicated above, Figure 4 are provided as examples. Other examples can differ from what is described with respect to at least one of the described examples. Figure 4

[0083] Figure 5 are diagrams illustrating examples 500, 510, and 520 of a CSI-RS beam management procedure according to the present disclosure. As shown in Figure 5 the examples 500, 510, and 520 include a UE 120 in communication with a base station 110 in a wireless network (e.g., the wireless network 100). However, Figure 5 the devices shown are provided as examples only, and a wireless network can support communication and beam management between other devices (e.g., between a UE 120 and a base station 110 or TRP, between a mobile terminating node and a control node, between an integrated IAB child node and an IAB parent node, between a scheduled node and a scheduling node, etc.). In some aspects, the UE 120 and the base station 110 can be in a connected state (e.g., an RRC connected state, etc.).

[0084] As shown in Figure 5 the example 500 can include the base station 110 and the UE 120 communicating to perform beam management using CSI-RS. The example 500 depicts a first beam management procedure (e.g., a PI CSI-RS beam management). The first beam management procedure can be referred to as a beam selection procedure, an initial beam acquisition procedure, a beam sweeping procedure, a cell search procedure, a beam search procedure, etc. As shown in Figure 5 and the example 500, a CSI-RS can be configured to be transmitted from the base station 110 to the UE 120. The CSI-RS can be configured to be periodic (e.g., using RRC signaling, etc.), semi-persistent (e.g., using medium access control (MAC) control element (MAC-CE) signaling, etc.), and / or aperiodic (e.g., using DCI, etc.).

[0085] ​The first beam management procedure may include base station 110 performing beam sweeping on multiple transmit (Tx) beams. Base station 110 can use each transmit beam to transmit CSI-RS for beam management. To enable UE 120 to perform receive (Rx) beam sweeping, each CSI-RS on the transmit beams can be transmitted multiple times in the same RS resource set so that UE 120 can sweep the receive beams in multiple transmission instances. For example, if base station 110 has a set of N transmit beams and UE 120 has a set of M receive beams, CSI-RS can be transmitted M times on each of the N transmit beams, so that UE 120 can receive M beams per transmit beam. In other words, for each transmit beam of base station 110, UE 120 can perform beam sweeping using UE 120's receive beams. As a result, the first beam management procedure enables UE 120 to measure CSI-RS on different transmit beams using different receive beams, supporting the selection of beam pairs for base station 110 transmit beams / UE 120(th) receive beams. UE 120 can report the measurement results to base station 110 so that base station 110 can select one or more beam pairs for communication between base station 110 and UE 120. Although Example 500 has been described in conjunction with CSI-RS, the first beam management procedure can also use SSB to perform beam management in a similar manner as described above.

[0086] like Figure 5 As shown, Example 510 may include base station 110 and UE 120 communicating to perform beam management using CSI-RS. Example 510 depicts a second beam management procedure (e.g., P2 CSI-RS beam management). The second beam management procedure may be referred to as a beam improvement procedure, a base station beam improvement procedure, a TRP beam improvement procedure, and / or a transmit beam improvement procedure, etc. Figure 5As shown in example 510, the CSI-RS can be configured to be transmitted from the base station 110 to the UE 120. The CSI-RS can be configured to be aperiodic (e.g., using DCI, etc.). The second beam management procedure can include the base station 110 performing a beam sweep on one or more transmit beams. The one or more transmit beams can be a subset of all transmit beams associated with the base station 110 (e.g., determined based at least in part on measurements reported by the UE 120 in connection with the first beam management procedure). The base station 110 can transmit a CSI-RS using each of the one or more transmit beams for beam management. The UE 120 can measure each CSI-RS using a single (e.g., same) receive beam (e.g., determined based at least in part on measurements performed in connection with the first beam management procedure). The second beam management procedure can enable the base station 110 to select a best transmit beam based at least in part on reported measurements received from the UE 120 (e.g., using the single receive beam).

[0087] As indicated above, Figure 5 Example 520 can depict a third beam management procedure (e.g., P3 CSI-RS beam management), as shown in the middle. The third beam management procedure can be referred to as a beam refinement procedure, a UE beam refinement procedure, a receive beam refinement procedure, etc. As indicated above, Figure 5 As shown in example 520, one or more CSI-RSs can be configured to be transmitted from the base station 110 to the UE 120. The CSI-RSs can be configured to be aperiodic (e.g., using DCI, etc.). The third beam management procedure can include the base station 110 transmitting one or more CSI-RSs on a single transmit beam (e.g., determined based at least in part on measurements reported by the UE 120 in connection with the first beam management procedure and / or the second beam management procedure). To enable the UE 120 to perform a receive beam sweep, the CSI-RSs on the transmit beam can be repeatedly transmitted multiple times in the same set of RS resources such that the UE 120 can sweep one or more receive beams in multiple transmission instances. The one or more receive beams can be a subset of all receive beams associated with the UE 120 (e.g., determined based at least in part on measurements performed in connection with the first beam management procedure and / or the second beam management procedure). The third beam management procedure can enable the base station 110 and / or the UE 120 to select a best receive beam based at least in part on reported measurements received from the UE 120 (e.g., using reported measurements of the CSI-RSs on the transmit beam of the one or more receive beams).

[0088] As indicated above, Figure 5 are provided as examples. Other examples can differ from what is described Figure 6 with respect to the examples described in this regard.

[0089] Figure 6 is a diagram illustrating an example 600 of using beams for communication between a base station and a UE, in accordance with the present disclosure. As shown in Figure 6 example 600 includes communication between a base station 110 and a UE 120. In some aspects, the base station 110 and the UE 120 can be included in a wireless network, such as the wireless network 100. The base station 110 and the UE 120 can communicate on a wireless access link, which can include uplink and downlink.

[0090] The base station 110 can transmit to the UE 120 located within a coverage area of the base station 110. The base station 110 and the UE 120 (shown in Figure 6 ) can be configured for beamformed communications, where the base station 110 can transmit in the direction of the UE 120 using directional BS transmit beams, and the UE 120 can receive transmissions using directional UE receive beams. Each BS transmit beam can have an associated beam ID, beam direction, or beam symbol, among other examples. The base station 110 can transmit downlink communications via one or more BS transmit beams 605.

[0091] The UE 120 can attempt to receive the downlink communications via one or more UE receive beams 610, which can be configured at the receive circuitry of the UE 120 using different beamforming parameters. The UE 120 can identify a particular BS transmit beam 605 (shown as BS transmit beam 605-A) and a particular UE receive beam 610 (shown as UE receive beam 610-A) that provide relatively good performance (e.g., that have the best channel quality of different measured combinations of BS transmit beams 605 and UE receive beams 610). In some aspects, the UE 120 can transmit an indication of which BS transmit beam 605 the UE 120 identifies as a preferred BS transmit beam, which the base station 110 can select for downlink communications to the UE 120. Thus, the UE 120 can obtain and maintain a beam pair link (BPL) with the base station 110 for downlink communications (e.g., the combination of BS transmit beam 605-A and UE receive beam 610-A), which can be further refined and maintained according to one or more established beam refinement procedures.

[0092] Downlink beams such as BS transmit beams 605 or UE receive beams 610 can be associated with transmission configuration indication (TCI) states. A TCI state can indicate a directionality or characteristics of a downlink beam, such as one or more quasi-co-located (QCL) properties of the downlink beam. QCL properties can include, for example, Doppler shift, Doppler spread, average delay, delay spread, or spatial receive parameter, among other examples. In some aspects, each BS transmit beam 605 can be associated with a synchronization signal block (SSB), and a UE 120 can indicate a preferred BS transmit beam 605 by transmitting an uplink communication in resources of a SSB associated with the preferred BS transmit beam 605. A particular SSB can have an associated TCI state (e.g., for antenna port or for beamforming). In some examples, a base station 110 can indicate a downlink BS transmit beam 605 based at least in part on antenna port QCL properties that can be indicated by a TCI state. For different QCL types (e.g., QCL types for different combinations of Doppler shift, Doppler spread, average delay, delay spread, or spatial receive parameter, among other examples), a TCI state can be associated with one set of downlink reference signals (e.g., SSBs, and aperiodic, periodic, or semi-persistent channel state information reference signals (CSI-RS)). In cases where a QCL type indicates a spatial receive parameter, the QCL type can correspond to an analog receive beamforming parameter of a UE receive beam 610 at the UE 120. Thus, a UE 120 can select a corresponding UE receive beam 610 from a set of BPLs based at least in part on a BS transmit beam 605 indicated by a base station 110 via TCI indication.

[0093] The base station 110 can maintain a set of activated TCI states for downlink shared channel communications and a set of activated TCI states for downlink control channel communications. The set of activated TCI states for downlink shared channel communications can correspond to beams that the base station 110 uses for downlink communications on a physical downlink shared channel (PDSCH). The set of activated TCI states for downlink control channel communications can correspond to beams that the base station 110 can use for downlink communications on a physical downlink control channel (PDSCH) or in a control resource set (CORESET). The UE 120 can also maintain a set of activated TCI states for receiving downlink shared channel communications and CORESET communications. If a TCI state is activated for the UE 120, the UE 120 can have one or more antenna configurations based at least in part on the TCI state, and the UE 120 can not have to reconfigure the antenna or antenna weighting configurations. In some examples, the set of activated TCI states (e.g., activated PDSCH TCI states and / or activated CORESET TCI states) for the UE 120 can be configured by a configuration message, such as a radio resource control (RRC) message.

[0094] Similarly, for uplink communications, the UE 120 can transmit in the direction of the base station 110 using a directional UE transmit beam, and the base station 110 can receive the communication using a directional BS receive beam. Each UE transmit beam can have an associated beam ID, beam direction, or beam symbol, among other examples. The UE 120 can transmit uplink communications via one or more UE transmit beams 615.

[0095] The base stations 110 can receive uplink communications via one or more BS receive beams 620. The base stations 110 can identify a particular UE transmit beam 615 (shown as UE transmit beam 615-A) and a particular BS receive beam 620 (shown as BS receive beam 620-A) that provide relatively good performance (e.g., that have the best channel quality of different measured combinations of UE transmit beams 615 and BS receive beams 620). In some examples, the base stations 110 can transmit an indication of which UE transmit beam 615 the base stations 110 identify as a preferred UE transmit beam for the base stations 110 to use for communications from the UE 120. Thus, the UE 120 and the base stations 110 can obtain and maintain a BPL for uplink communications (e.g., the combination of UE transmit beam 615-A and BS receive beam 620-A), which can be further refined and maintained according to one or more established beam refinement procedures. An uplink beam, such as a UE transmit beam 615 or a BS receive beam 620, can be associated with a spatial relation. The spatial relation can indicate a directionality or characteristic of the uplink beam, similar to one or more QCL properties as described above.

[0096] As indicated above, Figure 6 are provided by way of example. Other examples can differ from Figure 7 the examples described.

[0097] Figure 7 is a diagram illustrating an example 700 of frequency components within a frequency range in accordance with the present disclosure. As shown in Figure 7 a UE (e.g., a UE 120) can be in communication with a scheduling entity (e.g., a base station 110, an IAB node, etc.) in a wireless network (e.g., the wireless network 100), which can include uplink and downlink communications. The communications can be within a given frequency range, which has a set of frequency components (e.g., CH0, CH1, CH2, CH3, CH4, CH5, and / or CH6) partitioned into frequency bands (e.g., a 2.16 GHz frequency band). The frequency components can be component carriers, occupied bandwidths, bandwidth parts, channels, etc.

[0098] Frequency bands of the 5G NR can include frequency range 1 (FR1), frequency range 2 (FR2), and / or the like. FR1 can span from 410 MHz to 7.125 GHz, with various frequency bands allocated (e.g., nl, n2, n3, and / or the like) within this frequency range. FR2 can span from 24.25 GHz to 52.6 GHz, with various frequency bands allocated (e.g., n257, n258, n260, n261, and / or the like) within this frequency range. The frequencies between FR1 and FR2 are sometimes referred to as mid-band frequencies. FR1 is often referred to as a “sub-6 GHz” band, despite a portion of FR1 being greater than 6 GHz. Similarly, FR2 is often referred to as a “millimeter wave” band, despite the frequencies being different from the extremely high frequency (EHF) band (30 GHz - 300 GHz) identified by the International Telecommunications Union (ITU) as a “millimeter wave” band.

[0099] Frequency bands of the 5G NR continue to expand to include frequency range (FR4). FR4 can span from 52.6 GHz to 114.25 GHz, with various frequency bands allocated within this frequency range. FR4 is often referred to as “higher millimeter wave” or “sub-terahertz.” As shown, multiple frequency components (e.g., CH0, CH1, CH2, CH3, CH4, CH5, and / or CH6) can be part of FR4 (e.g., from approximately 57 GHz to approximately 71 GHz). Figure 3

[0100] To improve radio transmission performance, techniques such as quasi co-location (QCL) and / or beamforming can be used. QCL is a technique that characterizes the relationship between an antenna and a corresponding signaling beam. QCL can facilitate establishing beam characteristics of one channel based on characteristics of another channel.

[0101] Beamforming is a technique used to form directional unicast beams between a UE and a base station to improve performance of a radio link between the UE and the base station. To perform beamforming, a base station can form a transmit beam that points toward a UE, and the UE can form a receive beam to receive the transmit beam. Additionally or alternatively, a UE can form a transmit beam that points toward a base station, and the base station can form a receive beam to receive the transmit beam. The base station and / or UE can use various hardware components to achieve beamforming, such as a controller / processor, an amplifier, a phase shifter, an antenna element, and / or the like. In some aspects, beamforming can use a beamforming codebook that includes one or more sets of beamforming weights that can be applied to an antenna array for a given frequency range. Beamforming is described in more detail above in connection with FIGS. 1-6. Figure 3 、 5 and 6.

[0102] ​Beamforming continues to provide valuable improvements to radio transmissions. However, when operating in ever-increasing frequency ranges, such as FR4, beamforming performance loss (also referred to as “beam squint”) for a given beamforming codebook can occur. Beamforming performance loss can result from limited hardware resources of a device (e.g., controller / processor, amplifiers, phase shifters, antenna elements, etc., as described above with reference to Figure 7 The attempt to implement beamforming for increasingly separate frequency components at higher frequencies. This can be particularly problematic for carrier aggregation (sometimes referred to as “channel bonding,” in which two or more frequency components are combined to increase data capacity). At higher frequencies, such as FR4, a configuration that can be an optimal beamforming configuration for one carrier aggregation can be suboptimal for another carrier aggregation.

[0103] Some techniques and apparatuses described herein can use a configuration between a scheduling entity and a UE to associate different sets of reference signals associated with a channel to different subsets of frequency components for carrier aggregation. Associating different sets of reference signals to different subsets of frequency components can allow different beamforming weights to be used for different subsets of frequency components and can allow different reference signals to be quasi co-located with optimal physical channels to minimize beamforming performance loss at higher frequencies, such as FR4. The reference signals can include channel state information reference signals (CSI-RSs) that can be used to report channel quality information (e.g., via downlink) and / or sounding reference signals (SRSs) that can be used to acquire channel state information (e.g., via uplink).

[0104] In some aspects, a scheduling entity, such as a base station, IAB node, etc., can transmit the configuration to a UE, and the UE can receive the configuration from the scheduling entity for associating different sets of reference signals to different subsets of frequency components for carrier aggregation. The scheduling entity can then transmit reference signals to the UE based at least in part on the configuration, and the UE can monitor for the reference signals from the scheduling entity. In some aspects, the scheduling entity can optimize its beamforming codebook and the UE can adjust accordingly. As a result, by using the configuration to associate different sets of reference signals to different subsets of frequency components for carrier aggregation to thereby allow optimal configurations for frequency components, beamforming performance loss at higher frequencies can be minimized.

[0105] As indicated above, Figure 7 are provided by way of example. Other examples can differ from what is described with respect to at least one of the Figure 8 described examples.

[0106] Figure 8 is a diagram illustrating an example 800 associated with reference signal configuration and QCL mapping for wide bandwidth systems, in accordance with the present disclosure. As Figure 7As shown in the middle, example 800 includes UE 120 in communication with a scheduling entity 805 (e.g., a base station 110, an IAB node, etc.). UE 120 and scheduling entity 805 can be in communication with each other in a wireless network (e.g., wireless network 100), which can include uplink and downlink.

[0107] As shown by reference number 810, to minimize beamforming performance loss at higher frequencies, scheduling entity 805 can transmit a configuration (e.g., via a downlink) to UE 120 that indicates a set of frequency components for carrier aggregation and that indicates a plurality of sets of reference signals. For example, scheduling entity 805 can transmit a configuration to UE 120 that indicates a set of frequency components for carrier aggregation (such as CH0, CH1, etc.) (as described in connection with Figure 8 and that indicates a plurality of sets of CSI-RSs (which can be used by UE 120 to report channel quality information to scheduling entity 805) and / or SRSs (which can be used by scheduling entity 805 to obtain channel state information).

[0108] The configuration from scheduling entity 805 can associate different sets of reference signals (e.g., sets of CSI-RSs and / or sets of SRSs) with different subsets of frequency components (e.g., CH0, CH1, etc.) included in the set of frequency components for UE 120. As shown, scheduling entity 805 can associate a first set of reference signals (e.g., set of CSI-RSs A and / or set of SRSs A) with a first subset of frequency components (e.g., subset of frequency components A, such as CH0 and CH1); associate a second set of reference signals (e.g., set of CSI-RSs B and / or set of SRSs B) with a second subset of frequency components (e.g., subset of frequency components B, such as CH2 and CH3); and so on. Associating different sets of reference signals with different subsets of frequency components can minimize beamforming performance loss at higher frequencies by allowing optimal configurations for frequency components. Figure 8

[0109] In some aspects, associating different sets of reference signals (e.g., sets of CSI-RSs and / or sets of SRSs) with different subsets of frequency components (e.g., CH0, CH1, etc.) can allow different beamforming weights to be used for different subsets of frequency components. For example, a first set of reference signals (e.g., set of CSI-RSs A and / or set of SRSs A) can be associated with a first set of beamforming weights; a second set of reference signals (e.g., set of CSI-RSs B and / or set of SRSs B) can be associated with a second set of beamforming weights; and so on. In some aspects, each set of reference signals can have a corresponding different set of beamforming weights. Allowing different beamforming weights to be used for different subsets of frequency components can allow UE 120 to minimize beamforming performance loss at higher frequencies by allowing optimal beamforming weights for frequency components. ​

[0110] In some aspects, associating different reference signal sets (e.g., CSI-RS sets and / or SRS sets) with different subsets of frequency components (e.g., CH0, CH1, etc.) can allow different reference signals to be quasi co-located with physical channels (e.g., physical downlink shared channels and / or physical uplink shared channels) on different subsets of frequency components, sometimes referred to as QCL mapping. For example, a first reference signal set (e.g., CSI-RS set A and / or SRS set A) can be quasi co-located with physical channels on a first subset of frequency components (e.g., frequency component subset A, such as CH0 and CH1); a second reference signal set (e.g., CSI-RS set B and / or SRS set B) can be quasi co-located with physical channels on a second subset of frequency components (e.g., frequency component subset B, such as CH2 and CH3); and so on. Allowing different reference signals to be quasi co-located with physical channels on different subsets of frequency components can allow UE 120 to minimize beamforming performance loss at higher frequencies by allowing optimal QCL mapping for frequency components.

[0111] The configuration from scheduling entity 805 to UE 120 can include an indication of resources for transmitting a reference signal set (e.g., a CSI-RS set and / or a SRS set) based at least in part on a variable bandwidth. The resources for transmitting the reference signal set can be defined by a starting resource block and an ending resource block and can be included in different subcarriers of a single OFDM symbol that is measured. In some aspects, the indication of resources for transmitting the reference signal set can be “two-dimensional” (e.g., using time and frequency resources), where the reference signal set is transmitted in multiple subcarriers across multiple OFDM symbols. In some aspects, the indication of resources for transmitting the reference signal set can be “three-dimensional” (e.g., using a combination of time, frequency, and beam resources), where the reference signal set is transmitted in multiple subcarriers and multiple beams across multiple OFDM symbols. Including an indication of resources for transmitting the reference signal set based at least in part on a variable bandwidth (rather than a fixed bandwidth) can provide increased flexibility.

[0112] As shown by reference number 815, based at least in part on the configuration, scheduling entity 805 can transmit (e.g., via a downlink) and UE 120 can receive one or more reference signals corresponding to a subset of frequency components included in the set of frequency components. For example, based at least in part on the configuration, scheduling entity 805 can transmit and UE 120 can receive one or more CSI-RSs and / or SRSs corresponding to a subset of frequency components, such as CH0, CH1, etc. As described above, scheduling entity 805 can transmit one or more reference signals corresponding to a subset of frequency components included in the set of frequency components to UE 120 to minimize beamforming performance loss at higher frequencies.

[0113] As shown by reference number 820, the UE 120 can monitor for one or more reference signals transmitted by the scheduling entity 805 corresponding to the subset of frequency components included in the set of frequency components. For example, based at least in part on the configuration, the UE 120 can monitor for one or more CSI-RSs and / or SRSs transmitted by the scheduling entity 805 corresponding to the subset of frequency components included in the set of frequency components, such as CH0, CH1, and / or the like. As described above, the UE 120 can receive one or more reference signals from the scheduling entity 805 corresponding to the subset of frequency components included in the set of frequency components to minimize beamforming performance loss at higher frequencies.

[0114] In some aspects, the UE 120 can measure one or more of the reference signals (e.g., CSI-RSs and / or SRSs) received from the scheduling entity 805 to improve beam performance (e.g., improved main lobe and / or reduced side lobes). For example, the UE 120 can measure one or more CSI-RSs and / or SRSs received from the scheduling entity 805 to perform a beam selection procedure, a beam management procedure, a beam improvement procedure, a beam failure detection procedure, a beam recovery procedure, and / or the like for the subset of frequency components based at least in part on measuring the one or more CSI-RSs or SRSs. As a result, the UE 120 can measure one or more of the reference signals received from the scheduling entity 805 to perform one or more beam procedures for improving beam performance.

[0115] As described above, the configuration from the scheduling entity 805 to the UE 120 can include an indication of resources for transmitting a set of reference signals (e.g., a set of CSI-RSs and / or a set of SRSs) based at least in part on a variable bandwidth (rather than a fixed bandwidth). To support the variable bandwidth, the UE 120 can measure frequency variations within a single OFDM symbol using a single radio frequency chain (associated with a single set of beam weights) of the UE 120 when monitoring for the one or more reference signals. In some aspects, the UE 120 can measure frequency variations of multiple OFDM symbols by using different radio frequency chains (associated with different sets of beam weights) of the UE 120 for different OFDM symbols when monitoring for the one or more reference signals. The UE 120 measuring frequency variations of one or more OFDM symbols using one or more radio frequency chains associated with beam weights can allow the UE 120 to support a variable bandwidth.

[0116] As indicated above, Figure 8 are provided by way of example. Other examples can differ from Figure 9 the examples described.

[0117] Figure 7is a diagram illustrating another example 900 associated with reference signal configuration and QCL mapping for wide bandwidth systems according to this disclosure. In example 900, a UE (e.g., UE 120) can be in communication with a scheduling entity (e.g., scheduling entity 805, such as a base station 110, IAB node, etc.) in a wireless network (e.g., wireless network 100), which can include uplink and downlink communications. The communications can be within a given frequency range, such as a portion of FR4 having multiple frequency components (e.g., CH0, CH1, CH2, CH3, CH4, CH5, and / or CH6), as described in connection with FIG. 8. The scheduling entity 805 can transmit (e.g., via a downlink) a configuration to the UE 120 indicating a set of frequency components for carrier aggregation and a plurality of reference signal sets and associating different reference signal sets with different subsets of frequency components. For example, the scheduling entity 805 can transmit a configuration to the UE 120 indicating a set of frequency components for carrier aggregation (e.g., CH0, CH1, CH2, and / or CH3), indicating a plurality of reference signal sets (e.g., CSI-RS1 or SRS1, CSI-RS2 or SRS2, CSI-RS3 or SRS3, and / or CSI-RS4 or SRS4), and associating different reference signal sets with different subsets of frequency components (e.g., CSI-RS1 or SRS1 is associated with CH0, CSI-RS2 or SRS2 is associated with CH1, CSI-RS3 or SRS3 is associated with CH2, and / or CSI-RS4 or SRS4 is associated with CH3). In this case, each subset of frequency components can include a single frequency component. As a result, each subset of frequency components can be associated with its own reference signal set to minimize beam transmission performance loss at higher frequencies. Figure 9 is described.

[0118] As shown by reference number 905, in a first example, to minimize beamforming performance loss at higher frequencies, the scheduling entity 805 can transmit (e.g., via a downlink) a configuration to the UE 120 indicating a set of frequency components for carrier aggregation and a plurality of reference signal sets and associating different reference signal sets with different subsets of frequency components. For example, the scheduling entity 805 can transmit a configuration to the UE 120 indicating a set of frequency components for carrier aggregation (e.g., CH0, CH1, CH2, and / or CH3), indicating a plurality of reference signal sets (e.g., CSI-RS1 or SRS1, CSI-RS2 or SRS2, CSI-RS3 or SRS3, and / or CSI-RS4 or SRS4), and associating different reference signal sets with different subsets of frequency components (e.g., CSI-RS1 or SRS1 is associated with CH0, CSI-RS2 or SRS2 is associated with CH1, CSI-RS3 or SRS3 is associated with CH2, and / or CSI-RS4 or SRS4 is associated with CH3). In this case, each subset of frequency components can include a single frequency component. As a result, each subset of frequency components can be associated with its own reference signal set to minimize beam transmission performance loss at higher frequencies.

[0119] In some aspects, different reference signal sets (e.g., CSI-RS1 or SRS1, CSI-RS2 or SRS2, CSI-RS3 or SRS3, and / or CSI-RS4 or SRS4) can be associated with different subsets of frequency components (e.g., CH0, CH1, CH2, and / or CH3) to allow different beamforming weights to be used for different subsets of frequency components. For example, a first reference signal set (e.g., CSI-RS1 or SRS1) can be associated with a first frequency component (e.g., CH0) to allow use of a first beamforming weight; a second reference signal set (e.g., CSI-RS2 or SRS2) can be associated with a second frequency component (e.g., CH1) to allow use of a second beamforming weight; a third reference signal set (e.g., CSI-RS3 or SRS3) can be associated with a third frequency component (e.g., CH2) to allow use of a third beamforming weight; and / or a fourth reference signal set (e.g., CSI-RS4 or SRS4) can be associated with a fourth frequency component (e.g., CH3) to allow use of a fourth beamforming weight. Allowing different beamforming weights to be used for different subsets of frequency components can allow UE 120 to minimize beamforming performance loss at higher frequencies.

[0120] In some aspects, different reference signal sets (e.g., CSI-RS1 or SRS1, CSI-RS2 or SRS2, CSI-RS3 or SRS3, and / or CSI-RS4 or SRS4) can be associated with different subsets of frequency components (e.g., CH0, CH1, CH2, and / or CH3) to allow different reference signals to be quasi co-located with physical channels on different subsets of frequency components. For example, a first reference signal set (e.g., CSI-RS1 or SRS1) can be quasi co-located with a physical channel on a first frequency component (e.g., CH0) in a first mapping (e.g., QCL1 mapping); a second reference signal set (e.g., CSI-RS2 or SRS2) can be quasi co-located with a physical channel on a second frequency component (e.g., CH1) in a second mapping (e.g., QCL2 mapping); a third reference signal set (e.g., CSI-RS3 or SRS3) can be quasi co-located with a physical channel on a third frequency component (e.g., CH2) in a third mapping (e.g., QCL3 mapping); and / or a fourth reference signal set (e.g., CSI-RS4 or SRS4) can be quasi co-located with a physical channel on a fourth frequency component (e.g., CH3) in a fourth mapping (e.g., QCL4 mapping); allowing different reference signals to be quasi co-located with physical channels on different subsets of frequency components can allow UE 120 to minimize beamforming performance loss at higher frequencies.

[0121] As shown by reference number 910, in a second example, to minimize beamforming performance loss at higher frequencies, the scheduling entity 805 can transmit (e.g., via the downlink) a configuration to the UE 120 indicating a set of frequency components for carrier aggregation and a plurality of reference signal sets and associating different reference signal sets to different subsets of the plurality of frequency components. For example, the scheduling entity 805 can transmit a configuration to the UE 120 indicating a set of frequency components for carrier aggregation (e.g., CH0, CH1, CH2, and / or CH3), indicating a plurality of reference signal sets (e.g., CSI-RS1 or SRS1 and / or CSI-RS2 or SRS2), and associating different reference signal sets to different subsets of the plurality of frequency components (e.g., CSI-RS1 or SRS1 is associated with CH0 and CH1, and CSI-RS2 or SRS2 is associated with CH2 and CH3). As a result, subsets of the plurality of frequency components can be associated with their own reference signal set to minimize beam transmission performance loss at higher frequencies.

[0122] In some aspects, different reference signal sets (CSI-RS1 or SRS1 and / or CSI-RS2 or SRS2) can be associated with different subsets of the plurality of frequency components (e.g., CH0 and CH1 and / or CH2 and CH3) to allow for different beamforming weights to be used. For example, a first reference signal set (e.g., CSI-RS1 or SRS1) can be associated with a first subset of the plurality of frequency components (e.g., CH0 and CH1) to allow for a first beamforming weight to be used; and / or a second reference signal set (e.g., CSI-RS2 or SRS2) can be associated with a second subset of the plurality of frequency components (e.g., CH2 and CH3) to allow for a second beamforming weight to be used. Allowing different beamforming weights to be used for different subsets of the plurality of frequency components can allow the UE 120 to optimize the beamforming weights to minimize beamforming performance loss at higher frequencies.

[0123] In some aspects, different sets of reference signals (CSI-RS1 or SRS1 and / or CSI-RS2 or SRS2) can be associated with different subsets of the plurality of frequency components (e.g., CH0 and CH1 and / or CH2 and CH3) to allow different reference signals to be quasi co-located with physical channels. For example, a first set of reference signals (e.g., CSI-RS1 or SRS1) can be quasi co-located with physical channels on a first subset of the plurality of frequency components (e.g., CH0 and CH1) in a first mapping (e.g., QCL1 mapping); and / or a second set of reference signals (e.g., CSI-RS2 or SRS2) can be quasi co-located with physical channels on a second subset of the plurality of frequency components (e.g., CH2 and CH3) in a second mapping (e.g., QCL2 mapping). Allowing different reference signals to be quasi co-located with physical channels on different subsets of the plurality of frequency components can allow UE 120 to minimize beamforming performance loss at higher frequencies.

[0124] As shown by reference number 915, in a third example, to minimize beamforming performance loss at higher frequencies, scheduling entity 805 can transmit (e.g., via a downlink) a configuration to UE 120 indicating a set of frequency components for carrier aggregation and a plurality of sets of reference signals and associating different sets of reference signals with different subsets of frequency components and to one or more groups of different subsets of frequency components. For example, scheduling entity 805 can transmit a configuration to UE 120 indicating a set of frequency components for carrier aggregation (e.g., CH0 and / or CH1), indicating a plurality of sets of reference signals (e.g., CSI-RS1 or SRS1, CSI-RS2 or SRS2, and / or CSI-RS3 or SRS3), and associating different sets of reference signals to different subsets of frequency components (e.g., CSI-RS1 or SRS1 is associated with CH0 and CSI-RS2 or SRS2 is associated with CH1) and to one or more groups of different subsets of frequency components (e.g., CSI-RS3 or SRS3 is associated with CH0 and CH1 as a group). As a result, each subset of frequency components can be associated with its own set of reference signals and / or one or more groups of subsets of frequency components can be associated with its own set of reference signals to minimize beamforming performance loss at higher frequencies.

[0125] In some aspects, different reference signal sets (e.g., CSI-RS1 or SRS1, CSI-RS2 or SRS2, and / or CSI-RS3 or SRS3) can be associated with different subsets of frequency components (e.g., CH0 and CH1 as individual subsets) and to one or more groups of different subsets of frequency components (e.g., CH0 and CH1 as subsets in a group) to allow for different beamforming weights to be used. For example, a first reference signal set (e.g., CSI-RS1 or SRS1) can be associated with a first subset of frequency components (e.g., CH0) to allow for a first beamforming weight to be used; a second reference signal set (e.g., CSI-RS2 or SRS2) can be associated with a second subset of frequency components (e.g., CH1) to allow for a second beamforming weight to be used; and / or a third reference signal set (e.g., CSI-RS3 or SRS3) can be associated with a group of the first and second subsets of frequency components (e.g., CH0 and CH1) to allow for a third beamforming weight to be used. Allowing different beamforming weights to be used for different subsets of frequency components and different groups of subsets of frequency components can allow the UE 120 to optimize the beamforming weights to minimize beamforming performance loss at higher frequencies.

[0126] In some aspects, different reference signal sets (e.g., CSI-RS1 or SRS1, CSI-RS2 or SRS2, and / or CSI-RS3 or SRS3) can be associated with different subsets of frequency components (e.g., CH0 and CH1 as individual subsets) and to one or more groups of different subsets of frequency components (e.g., CH0 and CH1 as subsets in a group) to allow for different reference signals to be quasi co-located with physical channels on different subsets of frequency components and different groups of subsets of frequency components. For example, a first reference signal set (e.g., CSI-RS1 or SRS1) can be quasi co-located with physical channels on a first subset of frequency components (e.g., CH0) in a first mapping (e.g., QCL1 mapping); a second reference signal set (e.g., CSI-RS2 or SRS2) can be quasi co-located with physical channels on a second subset of frequency components (e.g., CH1) in a second mapping (e.g., QCL2 mapping); and / or a third reference signal set (e.g., CSI-RS3 or SRS3) can be quasi co-located with physical channels on a group of the first and second subsets of frequency components (e.g., CH0 and CH1) in a third mapping (e.g., QCL3 mapping). Allowing different reference signals to be quasi co-located with physical channels on different subsets of frequency components and different groups of subsets of frequency components can allow the UE 120 to optimize the QCL mappings to minimize beamforming performance loss at higher frequencies.

[0127] As indicated above, Figure 9 are provided as examples. Other examples can differ from what is described with respect to at least one of the following. Figure 10The described examples.

[0128] Figure 10 FIG. 10 is a diagram illustrating an example process 1000 performed, for example, by a UE, in accordance with aspects of the present disclosure. Example process 1000 is an example where the UE (e.g., UE 120) performs operations associated with reference signal configuration and QCL mapping for wide bandwidth systems.

[0129] As Figure 10 shown in FIG. 10, in some aspects, process 1000 can include receiving a configuration indicating a set of frequency components for carrier aggregation and indicating a plurality of sets of CSI-RSs or SRSs, where different sets of CSI-RSs or SRSs of the plurality of sets of CSI-RSs or SRSs correspond to different subsets of frequency components included in the set of frequency components (block 1010). For example, the UE (e.g., using antenna 252, demodulators 254, MIMO detector 256, receive processor 258, controller / processor 280, and / or memory 282) can receive a configuration indicating a set of frequency components for carrier aggregation and indicating a plurality of sets of CSI-RSs or SRSs, where different sets of CSI-RSs or SRSs of the plurality of sets of CSI-RSs or SRSs correspond to different subsets of frequency components included in the set of frequency components, as described above.

[0130] As Figure 10 further shown in FIG. 10, in some aspects, process 1000 can include monitoring, based at least in part on the configuration, one or more CSI-RSs or SRSs corresponding to a subset of frequency components included in the set of frequency components (block 1020). For example, the UE (e.g., using antenna 252, demodulators 254, MIMO detector 256, receive processor 258, controller / processor 280, and / or memory 282) can monitor, based at least in part on the configuration, one or more CSI-RSs or SRSs corresponding to a subset of frequency components included in the set of frequency components, as described above.

[0131] Process 1000 can include additional aspects, such as any single aspect or any combination of aspects described below and / or in connection with one or more other processes described elsewhere herein.

[0132] In a first aspect, a first set of CSI-RSs or SRSs of the plurality of sets of CSI-RSs or SRSs is associated with a first set of beamforming weights, and wherein a second set of CSI-RSs or SRSs of the plurality of sets of CSI-RSs or SRSs is associated with a second set of beamforming weights.

[0133] In a second aspect, alone or in combination with the first aspect, a first set of CSI-RSs or SRSs of the plurality of sets of CSI-RSs or SRSs is quasi co-located with a physical channel on a first subset of frequency components, and wherein a second set of CSI-RSs or SRSs of the plurality of sets of CSI-RSs or SRSs is quasi co-located with a physical channel on a second subset of frequency components.

[0134] In a third aspect, alone or in combination with one or more of the first and second aspects, a QCL mapping between a first set of CSI-RSs or SRSs of the plurality of sets of CSI-RSs or SRSs and the first subset of frequency components is different than a QCL mapping between a second set of CSI-RSs or SRSs of the plurality of sets of CSI-RSs or SRSs and the second subset of frequency components.

[0135] In a fourth aspect, alone or in combination with one or more of the first through third aspects, the first subset of frequency components is a single frequency component, and the second subset of frequency components includes the single frequency component and at least one other frequency component.

[0136] In a fifth aspect, alone or in combination with one or more of the first through fourth aspects, the subset of frequency components is a single frequency component.

[0137] In a sixth aspect, alone or in combination with one or more of the first through fifth aspects, the subset of frequency components includes two or more frequency components.

[0138] In a seventh aspect, alone or in combination with one or more of the first through sixth aspects, the process 1000 includes performing at least one of a beam selection procedure, a beam management procedure, a beam improvement procedure, a beam failure detection procedure, or a beam recovery procedure for the subset of frequency components based at least in part on measuring the one or more CSI-RSs or SRSs.

[0139] In an eighth aspect, alone or in combination with one or more of the first through seventh aspects, one or more CSI-RS or SRS resources used to transmit the one or more CSI-RSs or SRSs are based at least in part on a variable bandwidth for communications of the UE.

[0140] In a ninth aspect, alone or in combination with one or more of the first through eighth aspects, one or more CSI-RS or SRS resources used to transmit the one or more CSI-RSs or SRSs are defined by a starting resource block and an ending resource block.

[0141] In a tenth aspect, alone or in combination with one or more of the first through ninth aspects, the process 1000 includes receiving an indication of a set of CSI-RS or SRS resources included in different subcarriers of a single OFDM symbol, and wherein monitoring the one or more CSI-RS or SRS includes measuring a frequency variation within the single OFDM symbol using a single radio frequency chain of the UE.

[0142] In an eleventh aspect, alone or in combination with one or more of the first through tenth aspects, the process 1000 includes receiving an indication of a set of CSI-RS or SRS resources to be transmitted in multiple subcarriers across multiple OFDM symbols, and wherein monitoring the one or more CSI-RS or SRS includes measuring a frequency variation within each of the multiple OFDM symbols by using different radio frequency chains of the UE for different OFDM symbols.

[0143] In a twelfth aspect, alone or in combination with one or more of the first through eleventh aspects, the process 1000 includes receiving an indication of a set of CSI-RS or SRS resources to be transmitted in multiple subcarriers and multiple beams across multiple OFDM symbols, and wherein monitoring the one or more CSI-RS or SRS includes measuring a frequency variation within each of the multiple OFDM symbols by using different radio frequency chains of the UE for different OFDM symbols.

[0144] In a thirteenth aspect, alone or in combination with one or more of the first through twelfth aspects, the set of frequency components is a set of component carriers, a set of occupied bandwidths, a set of bandwidth parts, or a set of channelizations.

[0145] In a fourteenth aspect, alone or in combination with one or more of the first through thirteenth aspects, the set of frequency components is included in a frequency range included in at least one of a frequency range 2 band or a frequency range 4 band.

[0146] Although Figure 10 Example blocks of the process 1000 are illustrated, but in some aspects, the process 1000 can include additional blocks, fewer blocks, different blocks, or differently arranged blocks than those depicted in the figure. Additionally, or alternatively, two or more of the blocks of the process 1000 can be performed in parallel. Figure 11 In some aspects, the process 1000 can be performed by a UE, such as the UE 115a, 115b, or 115c illustrated in FIG. 1. In some aspects, the process 1000 can be performed by a component of the UE, such as a processor of the UE, or as software instructions executed by a processor of the UE.

[0147] Figure 11 FIG. 11 is a diagram illustrating an example process 1100 performed, for example, by a scheduling entity, in accordance with the present disclosure. Example process 1100 is an example of a process in which a scheduling entity (e.g., scheduling entity 805, such as a base station 110, IAB node, etc.) performs operations associated with reference signal configuration and QCL mapping for wide bandwidth systems.

[0148] As Figure 11 indicated at 1110, in some aspects, process 1100 can include transmitting a configuration indicating a set of frequency components for carrier aggregation and indicating a plurality of sets of CSI-RSs or SRSs, where different sets of CSI-RSs or SRSs of the plurality of sets of CSI-RSs or SRSs correspond to different subsets of frequency components included in the set of frequency components. For example, the scheduling entity (e.g., using transmit processor 220, TX MIMO processor 230, modulator 232, antenna 234, controller / processor 240, memory 242, and / or scheduler 246) can transmit a configuration indicating a set of frequency components for carrier aggregation and indicating a plurality of sets of CSI-RSs or SRSs, where different sets of CSI-RSs or SRSs of the plurality of sets of CSI-RSs or SRSs correspond to different subsets of frequency components included in the set of frequency components, as described above.

[0149] As Figure 11 further indicated in block 1120, in some aspects, process 1100 can include transmitting one or more CSI-RSs or SRSs corresponding to a subset of frequency components included in the set of frequency components based at least in part on the configuration. For example, the scheduling entity (e.g., using transmit processor 220, TX MIMO processor 230, modulator 232, antenna 234, controller / processor 240, memory 242, and / or scheduler 246) can transmit one or more CSI-RSs or SRSs corresponding to a subset of frequency components included in the set of frequency components based at least in part on the configuration, as described above.

[0150] Process 1100 can include additional aspects, such as any single aspect or any combination of aspects described below and / or in connection with one or more other processes described elsewhere herein.

[0151] In a first aspect, a first set of CSI-RSs or SRSs of the plurality of sets of CSI-RSs or SRSs is associated with a first set of beamforming weights, and where a second set of CSI-RSs or SRSs of the plurality of sets of CSI-RSs or SRSs is associated with a second set of beamforming weights.

[0152] In a second aspect, alone or in combination with the first aspect, a first set of CSI-RSs or SRSs of the plurality of sets of CSI-RSs or SRSs is quasi co-located with a physical channel on a first subset of frequency components, and where a second set of CSI-RSs or SRSs of the plurality of sets of CSI-RSs or SRSs is quasi co-located with a physical channel on a second subset of frequency components.

[0153] In a third aspect, alone or in combination with one or more of the first and second aspects, the QCL mapping between a first set of CSI-RSs or SRSs of the plurality of sets of CSI-RSs or SRSs and the first subset of frequency components is different than the QCL mapping between a second set of CSI-RSs or SRSs of the plurality of sets of CSI-RSs or SRSs and the second subset of frequency components.

[0154] In a fourth aspect, alone or in combination with one or more of the first through third aspects, the first subset of frequency components is a single frequency component and the second subset of frequency components includes the single frequency component and at least one other frequency component.

[0155] In a fifth aspect, alone or in combination with one or more of the first through fourth aspects, the subset of frequency components is a single frequency component.

[0156] In a sixth aspect, alone or in combination with one or more of the first through fifth aspects, the subset of frequency components includes two or more frequency components.

[0157] In a seventh aspect, alone or in combination with one or more of the first through sixth aspects, the process 1100 includes performing at least one of a beam selection procedure, a beam management procedure, a beam improvement procedure, a beam failure detection procedure, or a beam recovery procedure for the subset of frequency components based at least in part on measuring the one or more CSI-RSs or SRSs.

[0158] In an eighth aspect, alone or in combination with one or more of the first through seventh aspects, one or more CSI-RS or SRS resources used to transmit the one or more CSI-RSs or SRSs are based at least in part on a variable bandwidth for communications of the UE.

[0159] In a ninth aspect, alone or in combination with one or more of the first through eighth aspects, one or more CSI-RS or SRS resources used to transmit the one or more CSI-RSs or SRSs are defined by a starting resource block and an ending resource block.

[0160] In a tenth aspect, alone or in combination with one or more of the first through ninth aspects, the process 1100 includes transmitting an indication of a set of CSI-RS or SRS resources included in different subcarriers of a single OFDM symbol, and wherein transmitting the one or more CSI-RSs or SRSs includes transmitting the one or more CSI-RSs or SRSs to enable measurement of a frequency variation within the single OFDM symbol using a single radio frequency chain of the UE.

[0161] In an eleventh aspect, alone or in combination with one or more of the first through tenth aspects, process 1100 includes transmitting an indication of a set of CSI-RS or SRS resources across a plurality of subcarriers of a plurality of OFDM symbols, and wherein transmitting the one or more CSI-RS or SRS includes transmitting the one or more CSI-RS or SRS to enable measurement of frequency variations within each of the plurality of OFDM symbols by using different radio frequency chains of the UE for different OFDM symbols.

[0162] In a twelfth aspect, alone or in combination with one or more of the first through eleventh aspects, process 1100 includes transmitting an indication of a set of CSI-RS or SRS resources across a plurality of subcarriers and a plurality of beams of a plurality of OFDM symbols, and wherein transmitting the one or more CSI-RS or SRS includes transmitting the one or more CSI-RS or SRS to enable measurement of frequency variations within each of the plurality of OFDM symbols by using different radio frequency chains of the UE for different OFDM symbols.

[0163] In a thirteenth aspect, alone or in combination with one or more of the first through twelfth aspects, the set of frequency components is a set of component carriers, a set of occupied bandwidths, a set of bandwidth parts, or a set of channels.

[0164] In a fourteenth aspect, alone or in combination with one or more of the first through thirteenth aspects, the set of frequency components is included in a frequency range included in at least one of a frequency range 2 band or a frequency range 4 band.

[0165] Although Figure 11 Example blocks of process 1100 are illustrated, but in some aspects, process 1100 can include ​ more, different, or differently arranged blocks than pictured in block diagram 1100. Additionally or alternatively, two or more of the blocks of process 1100 can be performed in parallel.

[0166] The following provides an overview of some aspects of the disclosure:

[0167] Aspect 1 : A method of wireless communication performed by a user equipment (UE), comprising: receiving a configuration indicating a set of frequency components for carrier aggregation and indicating a plurality of sets of channel state information reference signals (CSI-RSs) or sounding reference signals (SRSs), wherein different sets of CSI-RSs or SRSs of the plurality of sets of CSI-RSs or SRSs correspond to different subsets of frequency components included in the set of frequency components; and monitoring for one or more CSI-RSs or SRSs corresponding to a subset of frequency components included in the set of frequency components based at least in part on the configuration.

[0168] Aspect 2: The method of aspect 1, wherein a first set of CSI-RSs or SRSs of the plurality of sets of CSI-RSs or SRSs is associated with a first set of beamforming weights, and wherein a second set of CSI-RSs or SRSs of the plurality of sets of CSI-RSs or SRSs is associated with a second set of beamforming weights.

[0169] Aspect 3: The method of any of aspects 1 or 2, wherein a first set of CSI-RSs or SRSs of the plurality of sets of CSI-RSs or SRSs is quasi co-located (QCL) with a first subset of frequency components on a physical channel, and wherein a second set of CSI-RSs or SRSs of the plurality of sets of CSI-RSs or SRSs is QCL with a second subset of frequency components on the physical channel.

[0170] Aspect 4: The method of any of aspects 1-3, wherein a QCL mapping between a first set of CSI-RSs or SRSs of the plurality of sets of CSI-RSs or SRSs and a first subset of frequency components is different than a QCL mapping between a second set of CSI-RSs or SRSs of the plurality of sets of CSI-RSs or SRSs and a second subset of frequency components.

[0171] Aspect 5: The method of aspect 4, wherein the first subset of frequency components is a single frequency component, and the second subset of frequency components includes the single frequency component and at least one other frequency component.

[0172] Aspect 6: The method of any of aspects 1-5, wherein the subset of frequency components is a single frequency component.

[0173] Aspect 7: The method of any of aspects 1-5, wherein the subset of frequency components includes two or more frequency components.

[0174] Aspect 8: The method of any of aspects 1-7, further comprising performing at least one of a beam selection procedure, a beam management procedure, a beam improvement procedure, a beam failure detection procedure, or a beam recovery procedure on the subset of frequency components based at least in part on measuring the one or more CSI-RSs or SRSs.

[0175] Aspect 9: The method of any of aspects 1-8, wherein one or more CSI-RS or SRS resources used to transmit the one or more CSI-RSs or SRSs are based at least in part on a variable bandwidth used for communications of the UE.

[0176] Aspect 10: The method of any of aspects 1-9, wherein the one or more CSI-RS or SRS resources used to transmit the one or more CSI-RS or SRS are defined by a starting resource block and an ending resource block.

[0177] Aspect 11: The method of any of aspects 1-10, further comprising: receiving an indication of a set of CSI-RS or SRS resources included in different subcarriers of a single orthogonal frequency division multiplexing (OFDM) symbol; and wherein monitoring the one or more CSI-RS or SRS comprises measuring a frequency variation within the single OFDM symbol using a single radio frequency chain of the UE.

[0178] Aspect 12: The method of any of aspects 1-10, further comprising: receiving an indication of a set of CSI-RS or SRS resources to be transmitted in multiple subcarriers across multiple orthogonal frequency division multiplexing (OFDM) symbols; and wherein monitoring the one or more CSI-RS or SRS comprises measuring a frequency variation within each of the multiple OFDM symbols by using different radio frequency chains of the UE for different OFDM symbols.

[0179] Aspect 13: The method of any of aspects 1-10, further comprising: receiving an indication of a set of CSI-RS or SRS resources to be transmitted in multiple subcarriers and multiple beams across multiple orthogonal frequency division multiplexing (OFDM) symbols; and wherein monitoring the one or more CSI-RS or SRS comprises measuring a frequency variation within each of the multiple OFDM symbols by using different radio frequency chains of the UE for different OFDM symbols.

[0180] Aspect 14: The method of any of aspects 1-13, wherein the set of frequency components is a set of component carriers, a set of occupied bandwidths, a set of bandwidth parts, or a set of channelizations.

[0181] Aspect 15: The method of any of aspects 1-14, wherein the set of frequency components is included in a frequency range included in at least one of a frequency range 2 frequency band or a frequency range 4 frequency band.

[0182] Aspect 16: A method of wireless communication performed by a scheduling entity, comprising: transmitting a configuration that indicates a set of frequency components for carrier aggregation and indicates a plurality of sets of channel state information reference signals (CSI-RSs) or sounding reference signals (SRSs), wherein different sets of CSI-RSs or SRSs of the plurality of sets of CSI-RSs or SRSs correspond to different subsets of frequency components included in the set of frequency components; and transmitting one or more CSI-RSs or SRSs corresponding to a subset of frequency components included in the set of frequency components based at least in part on the configuration.

[0183] Aspect 17: The method of any of Aspect 16, wherein a first set of CSI-RSs or SRSs of the plurality of sets of CSI-RSs or SRSs is associated with a first set of beamforming weights, and wherein a second set of CSI-RSs or SRSs of the plurality of sets of CSI-RSs or SRSs is associated with a second set of beamforming weights.

[0184] Aspect 18: The method of any of Aspect 16 or 17, wherein a first set of CSI-RSs or SRSs of the plurality of sets of CSI-RSs or SRSs is quasi co-located with a physical channel on a first subset of frequency components, and wherein a second set of CSI-RSs or SRSs of the plurality of sets of CSI-RSs or SRSs is quasi co-located with a physical channel on a second subset of frequency components.

[0185] Aspect 19: The method of any of Aspect 16-18, wherein a quasi co-location (QCL) mapping between a first set of CSI-RSs or SRSs of the plurality of sets of CSI-RSs or SRSs and a first subset of frequency components is different than a QCL mapping between a second set of CSI-RSs or SRSs of the plurality of sets of CSI-RSs or SRSs and a second subset of frequency components.

[0186] Aspect 20: The method of Aspect 19, wherein the first subset of frequency components is a single frequency component, and the second subset of frequency components includes the single frequency component and at least one other frequency component.

[0187] Aspect 21: The method of any of Aspect 16-20, wherein the subset of frequency components is a single frequency component.

[0188] Aspect 22: The method of any of Aspect 16-20, wherein the subset of frequency components includes two or more frequency components.

[0189] Aspect 23: The method of any of aspects 16-22, further comprising performing at least one of a beam selection procedure, a beam management procedure, a beam improvement procedure, a beam failure detection procedure, or a beam recovery procedure on the subset of frequency components based at least in part on measuring the one or more CSI-RSs or SRSs.

[0190] Aspect 24: The method of any of aspects 16-23, wherein the one or more CSI-RS or SRS resources used to transmit the one or more CSI-RSs or SRSs are based at least in part on a variable bandwidth used for communications of the UE.

[0191] Aspect 25: The method of any of aspects 16-24, wherein the one or more CSI-RS or SRS resources used to transmit the one or more CSI-RSs or SRSs are defined by a starting resource block and an ending resource block.

[0192] Aspect 26: The method of any of aspects 16-25, further comprising: transmitting an indication of a set of CSI-RS or SRS resources included in different subcarriers of a single orthogonal frequency-division multiplexing (OFDM) symbol; and wherein transmitting the one or more CSI-RSs or SRSs comprises transmitting the one or more CSI-RSs or SRSs to enable measurement of frequency variations within the single OFDM symbol using a single radio frequency chain of the UE.

[0193] Aspect 27: The method of any of aspects 16-25, further comprising: transmitting an indication of a set of CSI-RS or SRS resources across multiple subcarriers of multiple orthogonal frequency-division multiplexing (OFDM) symbols; and wherein transmitting the one or more CSI-RSs or SRSs comprises transmitting the one or more CSI-RSs or SRSs to enable measurement of frequency variations within each of the multiple OFDM symbols by using different radio frequency chains of the UE for different OFDM symbols.

[0194] Aspect 28: The method of any of aspects 16-25, further comprising: transmitting an indication of a set of CSI-RS or SRS resources across multiple subcarriers and multiple beams of multiple orthogonal frequency-division multiplexing (OFDM) symbols; and wherein transmitting the one or more CSI-RSs or SRSs comprises transmitting the one or more CSI-RSs or SRSs to enable measurement of frequency variations within each of the multiple OFDM symbols by using different radio frequency chains of the UE for different OFDM symbols.

[0195] Aspect 29: The method of any of aspects 16-28, wherein the set of frequency components is a set of component carriers, a set of occupied bandwidths, a set of bandwidth parts, or a set of channelizations.

[0196] Aspect 30: The method of any of aspects 16-29, wherein the set of frequency components is included in a frequency range included in at least one of a frequency range 2 band or a frequency range 4 band.

[0197] Aspect 31 : An apparatus for wireless communication at a device, comprising a processor; memory coupled with the processor; and instructions stored in the memory and executable by the processor to cause the apparatus to perform the method of one or more of Aspects 1-15.

[0198] Aspect 32: A device for wireless communication, comprising a memory; and one or more processors coupled to the memory, the one or more processors configured to perform the method of one or more of Aspects 1-15.

[0199] Aspect 33: A device for wireless communication, comprising at least one means for performing the method of one or more of Aspects 1-15.

[0200] Aspect 34: A non-transitory computer-readable medium storing code for wireless communication, the code comprising instructions executable by a processor to perform the method of one or more of Aspects 1-15.

[0201] Aspect 35: A non-transitory computer-readable medium storing a set of instructions for wireless communication, the set of instructions comprising one or more instructions that, when executed by one or more processors of a device, cause the device to perform the method of one or more of Aspects 1-15.

[0202] Aspect 36: An apparatus for wireless communication at a device, comprising a processor; memory coupled with the processor; and instructions stored in the memory and executable by the processor to cause the apparatus to perform the method of one or more of Aspects 16-30.

[0203] Aspect 37: A device for wireless communication, comprising a memory; and one or more processors coupled to the memory, the one or more processors configured to perform the method of one or more of Aspects 16-30.

[0204] Aspect 38: A device for wireless communication, comprising at least one means for performing the method of one or more of Aspects 16-30.

[0205] Aspect 39: A non-transitory computer-readable medium storing code for wireless communication, the code comprising instructions executable by a processor to perform the method of one or more of Aspects 16-30.

[0206] Aspect 40: A non-transitory computer-readable medium storing a set of instructions for wireless communication that, when executed by one or more processors of a device, cause the device to perform the method of one or more of Aspects 16-30.

[0207] The foregoing disclosure provides explanation and description to enable a thorough understanding of aspects, but is not intended to be exhaustive or to limit aspects to the precise form disclosed. Modifications and variations can be made in light of the above disclosure or can be acquired from practice of aspects.

[0208] As used herein, the term “component” is intended to be broadly interpreted to encompass hardware and / or a combination of hardware and software. “Software” shall be broadly interpreted to mean instructions, instruction sets, code, code segments, program code, programs, subprograms, software modules, applications, software applications, software packages, routines, subroutines, objects, executables, threads of execution, procedures, and / or functions, among other examples, whether referred to as software, firmware, middleware, microcode, hardware description language, or otherwise. As used herein, a processor is implemented in hardware and / or a combination of hardware and software. It will be apparent that systems and / or methods described herein can be implemented in different forms of hardware and / or a combination of hardware and software. The actual specialized control hardware or software code used to implement these systems and / or methods is not limiting of the aspects. Thus, the operation and behavior of the systems and / or methods were described herein without reference to specific software code — it is understood that software and hardware can be designed to implement the systems and / or methods based, at least in part, on the description herein.

[0209] As used herein, depending on the context, meeting a threshold can refer to a value being greater than the threshold, greater than or equal to the threshold, less than the threshold, less than or equal to the threshold, equal to the threshold, not equal to the threshold, and / or the like.

[0210] Although specific combinations of features are set out in the claims and / or disclosed in the specification, these combinations are not intended to limit the disclosure of various aspects. In fact, many combinations of features can be made without departing from the scope of the disclosure as recited in the claims. Although each dependent claim listed below can stand on its own as a separate disclosure, the disclosure of various aspects includes each dependent claim in combination with every other claim in the set. As used in this document, the conjunction "or" as used in a list of items prefaced by "at least one of’ indicates a disjunctive list such that, for example, a list of "at least one of A, B, or C" means: A or B or C or any combination thereof. As used in this document, the conjunction "or" as used in a list of items prefaced by "one of’ indicates an conjunctive list such that, for example, a list of "one of A, B, or C" means: A or B or C or any combination thereof.

[0211] No element, act, or instruction used herein should be construed as critical or essential unless explicitly described as such. Also, as used herein, the articles "a” and "an” are intended to include one or more items, and can be used interchangeably with "one or more." Furthermore, as used herein, the article "the” is intended to include one or more items, and can be used interchangeably with "the one or more." Also, as used herein, the term "set” and "group” is intended to include one or more items (for example, related items, unrelated items, or a combination of related and unrelated items), and can be used interchangeably with "one or more." Where only one item is intended, the phrase "only one” or similar language is used. Also, as used herein, the terms "has,” "have,” "having,” or the like are intended to be open-ended terms. Further, the phrase "based on" is intended to mean "based, at least in part, on" unless explicitly stated otherwise. Also, as used herein, the term "or” as used in a list of items prefaced by "comprising at least one of’ indicates a disjunctive list such that, for example, a list of "at least one of A, B, or C" means: A, B, or C, or any combination thereof.

Claims

1. An apparatus for wireless communication at a user equipment (UE), comprising: a memory; and one or more processors coupled to the memory, the one or more processors configured to: receive a configuration indicating a set of frequency components for carrier aggregation and indicating a plurality of channel state information reference signal (CSI-RS) sets or sounding reference signal (SRS) sets, wherein different CSI-RS sets or SRS sets of the plurality of CSI-RS sets or SRS sets correspond to different subsets of frequency components included in the set of frequency components; and monitor, based at least in part on the configuration, one or more CSI-RSs or SRSs corresponding to a subset of frequency components included in the set of frequency components, wherein the one or more processors are further configured to: receive an indication of a set of CSI-RS or SRS resources included in different subcarriers of a single orthogonal frequency-division multiplexing (OFDM) symbol, wherein to monitor the one or more CSI-RSs or SRSs, the one or more processors are configured to measure a frequency variation within the single OFDM symbol using a single radio frequency chain of the UE; or receive an indication of a set of CSI-RS or SRS resources to be transmitted in multiple subcarriers across multiple OFDM symbols, wherein to monitor the one or more CSI-RSs or SRSs, the one or more processors are configured to measure a frequency variation within each of the multiple OFDM symbols by using different radio frequency chains of the UE for different OFDM symbols; or receive an indication of a set of CSI-RS or SRS resources to be transmitted in multiple subcarriers and multiple beams across multiple OFDM symbols, wherein to monitor the one or more CSI-RSs or SRSs, the one or more processors are configured to measure a frequency variation within each of the multiple OFDM symbols by using different radio frequency chains of the UE for different OFDM symbols, wherein each radio frequency chain is associated with a set of beam weights.

2. The apparatus of claim 1, wherein a first CSI-RS set or SRS set of the plurality of CSI-RS sets or SRS sets is associated with a first set of beamforming weights, and wherein a second CSI-RS set or SRS set of the plurality of CSI-RS sets or SRS sets is associated with a second set of beamforming weights.

3. The apparatus of claim 1, wherein a first CSI-RS set or SRS set of the plurality of CSI-RS sets or SRS sets is quasi co-located with a physical channel on a first subset of frequency components, and wherein a second CSI-RS set or SRS set of the plurality of CSI-RS sets or SRS sets is quasi co-located with a physical channel on a second subset of frequency components.

4. The apparatus of claim 1, wherein a quasi co-location (QCL) mapping between a first set of CSI-RSs or SRSs of the plurality of sets of CSI-RSs or SRSs and a first subset of frequency components is different than a QCL mapping between a second set of CSI-RSs or SRSs of the plurality of sets of CSI-RSs or SRSs and a second subset of frequency components.

5. The apparatus of claim 4, wherein the first subset of frequency components is a single frequency component and the second subset of frequency components includes the single frequency component and at least one other frequency component.

6. The apparatus of claim 1, wherein the subset of frequency components is a single frequency component.

7. The apparatus of claim 1, wherein the subset of frequency components includes two or more frequency components.

8. The apparatus of claim 1, wherein the one or more processors are further configured to perform at least one of a beam selection procedure, a beam management procedure, a beam improvement procedure, a beam failure detection procedure, or a beam recovery procedure for the subset of frequency components based at least in part on measuring the one or more CSI-RSs or SRSs.

9. The apparatus of claim 1, wherein one or more CSI-RS or SRS resources used to transmit the one or more CSI-RSs or SRSs are based at least in part on a variable bandwidth used for communications of the UE.

10. The apparatus of claim 1, wherein one or more CSI-RS or SRS resources used to transmit the one or more CSI-RSs or SRSs are defined by a starting resource block and an ending resource block.

11. The apparatus of claim 1, wherein the set of frequency components is a set of component carriers, a set of occupied bandwidths, a set of bandwidth parts, or a set of channelizations.

12. The apparatus of claim 1, wherein the set of frequency components is included in a frequency range included in at least one of a frequency range 2 band or a frequency range 4 band.

13. An apparatus for wireless communication at a scheduling entity, comprising: a memory; and one or more processors coupled to the memory, the one or more processors configured to: transmit a configuration, the configuration indicating a set of frequency components for carrier aggregation and indicating a plurality of sets of channel state information reference signals (CSI-RSs) or sounding reference signals (SRSs), wherein different sets of CSI-RSs or SRSs of the plurality of sets of CSI-RSs or SRSs correspond to different subsets of frequency components included in the set of frequency components; and transmit one or more CSI-RSs or SRSs corresponding to a subset of frequency components included in the set of frequency components based at least in part on the configuration, wherein the one or more processors are further configured to: transmitting an indication of a set of CSI-RS or SRS resources included in different subcarriers of a single orthogonal frequency division multiplexing (OFDM) symbol, wherein to transmit the one or more CSI-RS or SRS, the one or more processors are configured to transmit the one or more CSI-RS or SRS to enable measurement of a frequency variation within the single OFDM symbol using a single radio frequency chain of a user equipment (UE); or transmitting an indication of a set of CSI-RS or SRS resources in multiple subcarriers across multiple OFDM symbols, wherein to transmit the one or more CSI-RS or SRS, the one or more processors are configured to transmit the one or more CSI-RS or SRS to enable measurement of a frequency variation within each of the multiple OFDM symbols by using different radio frequency chains of the UE for different OFDM symbols; or transmitting an indication of a set of CSI-RS or SRS resources in multiple subcarriers and multiple beams across multiple OFDM symbols, wherein to transmit the one or more CSI-RS or SRS, the one or more processors are configured to transmit the one or more CSI-RS or SRS to enable measurement of a frequency variation within each of the multiple OFDM symbols by using different radio frequency chains of the UE for different OFDM symbols, wherein each radio frequency chain is associated with a set of beam weights.

14. The apparatus of claim 13, wherein a first set of CSI-RS or SRS of the multiple sets of CSI-RS or SRS is associated with a first set of beamforming weights, and wherein a second set of CSI-RS or SRS of the multiple sets of CSI-RS or SRS is associated with a second set of beamforming weights.

15. The apparatus of claim 13, wherein a first set of CSI-RS or SRS of the multiple sets of CSI-RS or SRS is quasi co-located (QCL) with a physical channel on a first subset of frequency components, and wherein a second set of CSI-RS or SRS of the multiple sets of CSI-RS or SRS is QCL with a physical channel on a second subset of frequency components.

16. The apparatus of claim 13, wherein a quasi co-location (QCL) mapping between a first set of CSI-RS or SRS of the multiple sets of CSI-RS or SRS and a first subset of frequency components is different than a QCL mapping between a second set of CSI-RS or SRS of the multiple sets of CSI-RS or SRS and a second subset of frequency components.

17. The apparatus of claim 16, wherein the first subset of frequency components is a single frequency component, and the second subset of frequency components includes the single frequency component and at least one other frequency component.

18. The apparatus of claim 13, wherein the one or more processors are further configured to perform at least one of a beam selection procedure, a beam management procedure, a beam improvement procedure, a beam failure detection procedure, or a beam recovery procedure for the subset of frequency components based at least in part on measuring the one or more CSI-RSs or SRSs.

19. The apparatus of claim 13, wherein one or more CSI-RS or SRS resources used to transmit the one or more CSI-RSs or SRSs are based at least in part on a variable bandwidth used for communications of the UE.

20. The apparatus of claim 13, wherein one or more CSI-RS or SRS resources used to transmit the one or more CSI-RSs or SRSs are defined by a starting resource block and an ending resource block.

21. The apparatus of claim 13, wherein the set of frequency components is a set of component carriers, a set of occupied bandwidths, a set of bandwidth parts, or a set of channelizations.

22. The apparatus of claim 13, wherein the set of frequency components is included in a frequency range included in at least one of a frequency range 2 band or a frequency range 4 band.

23. A method of wireless communication performed by a user equipment (UE), comprising: receiving a configuration indicating a set of frequency components for carrier aggregation and indicating a plurality of sets of channel state information reference signals (CSI-RSs) or sounding reference signals (SRSs), wherein different sets of CSI-RSs or SRSs of the plurality of sets of CSI-RSs or SRSs correspond to different subsets of frequency components included in the set of frequency components; and monitoring, based at least in part on the configuration, one or more CSI-RSs or SRSs corresponding to a subset of frequency components included in the set of frequency components, wherein the method further comprises: receiving an indication of a set of CSI-RS or SRS resources included in different subcarriers of a single orthogonal frequency-division multiplexing (OFDM) symbol, and to monitor the one or more CSI-RSs or SRSs, measuring a frequency variation within the single OFDM symbol using a single radio frequency chain of the UE; or receiving an indication of a set of CSI-RS or SRS resources to be transmitted in multiple subcarriers across multiple OFDM symbols, and to monitor the one or more CSI-RSs or SRSs, measuring a frequency variation within each of the multiple OFDM symbols by using different radio frequency chains of the UE for different OFDM symbols; or receiving an indication of a set of CSI-RS or SRS resources to be transmitted in multiple subcarriers across multiple OFDM symbols and multiple beams, and to monitor the one or more CSI-RSs or SRSs, measuring a frequency variation within each of the multiple OFDM symbols by using different radio frequency chains of the UE for different OFDM symbols, wherein each radio frequency chain is associated with a set of beam weights.

24. A method of wireless communication performed by a scheduling entity, comprising: a transmission configuration, the configuration indicating a set of frequency components for carrier aggregation and indicating a plurality of channel state information reference signal (CSI-RS) sets or sounding reference signal (SRS) sets, where different CSI-RS sets or SRS sets of the plurality of CSI-RS sets or SRS sets correspond to different subsets of frequency components included in the set of frequency components; and transmitting one or more CSI-RSs or SRSs corresponding to a subset of frequency components included in the set of frequency components based at least in part on the configuration, wherein the method further comprises: transmitting an indication of a set of CSI-RS or SRS resources included in different subcarriers of a single orthogonal frequency-division multiplexing (OFDM) symbol, and to transmit the one or more CSI-RSs or SRSs, transmitting the one or more CSI-RSs or SRSs to enable measurement of frequency variation within the single OFDM symbol using a single radio frequency chain of a user equipment (UE); or transmitting an indication of a set of CSI-RS or SRS resources in multiple subcarriers across multiple OFDM symbols, and to transmit the one or more CSI-RSs or SRSs, transmitting the one or more CSI-RSs or SRSs to enable measurement of frequency variation within each of the multiple OFDM symbols by using different radio frequency chains of the UE for different OFDM symbols; or transmitting an indication of a set of CSI-RS or SRS resources in multiple subcarriers and multiple beams across multiple OFDM symbols, and to transmit the one or more CSI-RSs or SRSs, transmitting the one or more CSI-RSs or SRSs to enable measurement of frequency variation within each of the multiple OFDM symbols by using different radio frequency chains of the UE for different OFDM symbols, wherein each radio frequency chain is associated with a set of beam weights.

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