Uplink composite beamforming

Abstract

Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a user equipment (UE) can transmit sounding reference signals (SRSs) to a base station on multiple beams using a set of SRS resources indicated by the base station. The UE can receive, from the base station, an SRS resource indicator indicating one or more SRS resources of the set of SRS resources and determine a combined transmit beam from the multiple beams based at least in part on the SRS resource indicator. Numerous other aspects are provided.

Description

[0001] Cross-references to related applications

[0002] This patent application claims priority to U.S. Provisional Patent Application No. 62 / 705,815, entitled "UPLINK COMPOSITE BEAMSYNTHESIS," filed July 16, 2020, and U.S. Non-Provisional Patent Application No. 16 / 948,895, entitled "UPLINK COMPOSITE BEAM SYNTHESIS," filed October 5, 2020, which are hereby expressly incorporated by reference.

[0003] open field

[0004] Various aspects of this disclosure generally relate to wireless communication, and to techniques and apparatus for synthesizing uplink composite beams.

[0005] background

[0006] Wireless communication systems are widely deployed to provide a variety of telecommunications services such as telephone, video, data, messaging, and broadcasting. Typical wireless communication systems employ multiple access technologies that can support communication with multiple users by sharing available system resources (e.g., bandwidth, transmit power). 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 an enhancement set of the Universal Mobile Telecommunications System (UMTS) mobile standard issued by the 3rd Generation Partnership Project (3GPP).

[0007] A wireless network may include several base stations (BSs) capable of supporting communication between several user equipments (UEs). UEs can communicate with the base stations (BSs) via downlinks and uplinks. A downlink (or forward link) refers to the communication link from the BS to the UE, while an 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 may be referred to as a B-node, gNB, access point (AP), radio headend, transmit / receive point (TRP), new radio (NR) BS, 5G B-node, etc.

[0008] The multiple access technologies mentioned above have been adopted in various telecommunications standards to provide a common protocol enabling different user equipment to communicate at the city, country, region, and even global levels. New Radio (NR) (also known as 5G) is an enhancement set to the LTE mobile standard issued by the 3rd Generation Partnership Project (3GPP). NR is designed to better support mobile broadband internet access by using Orthogonal Frequency Division Multiplexing (OFDM) with a Cyclic Prefix (CP) (CP-OFDM) on the downlink (DL), and CP-OFDM and / or SC-FDM (e.g., also known as Discrete Fourier Transform Extended OFDM (DFT-s-OFDM)) on the uplink (UL), as well as supporting beamforming, multiple-input multiple-output (MIMO) antenna technologies and carrier aggregation to improve spectral efficiency, reduce costs, improve service, utilize new spectrum, and better integrate with other open standards. Further improvements to LTE, NR, and other radio access technologies remain useful as the demand for mobile broadband access continues to grow.

[0009] Overview

[0010] In some aspects, a wireless communication method performed by a user equipment (UE) includes transmitting SRS to a base station on multiple beams using a set of detection reference signals (SRS) resources indicated by a base station. The method further includes receiving from the base station an SRS resource indicator indicating one or more SRS resources in the SRS resource set, and determining a combined transmit beam from the multiple beams based at least in part on the SRS resource indicator.

[0011] In some aspects, a wireless communication method performed by a base station includes: determining, at least in part, a set of SRS resources to be provided to the UE based on feedback to one or more signals transmitted to the UE, and transmitting an indication of the SRS resource set to the UE for use in beam training. The method further includes: determining one or more SRS resources for the UE from the SRS resource set based at least in part on measurements of SRS received from the UE via the SRS resource set on multiple beams; transmitting an SRS resource indicator to the UE, the SRS resource indicator indicating the one or more SRS resources in the SRS resource set; and receiving communication from the UE on a combined transmit beam of multiple beam combinations based at least in part on the one or more SRS resources.

[0012] In some aspects, a UE for wireless communication includes a memory and one or more processors operatively coupled to the memory, the memory and the one or more processors being configured to: transmit SRS to the base station on a plurality of beams using an SRS resource set indicated by the base station, receive from the base station an SRS resource indicator indicating one or more SRS resources in the SRS resource set, and determine a combined transmit beam from the plurality of beams based at least in part on the SRS resource indicator.

[0013] In some aspects, a base station for wireless communication includes a memory and one or more processors operatively coupled to the memory, the memory and the one or more processors being configured to: determine, at least in part, a set of SRS resources to be provided to the UE based on feedback of one or more signals transmitted to a UE, and to transmit to the UE an indication of the SRS resource set for use in beam training. The memory and the one or more processors are configured to: determine, at least in part, one or more SRS resources for the UE from the SRS resource set based on measurements of SRS received from the UE via the SRS resource set on multiple beams; transmit an SRS resource indicator to the UE indicating the one or more SRS resources in the SRS resource set; and receive communication from the UE on a combined transmit beam of multiple beams based at least in part on the one or more SRS resources.

[0014] In some aspects, a non-transient 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 UE, cause the UE to: transmit SRS to the base station on multiple beams using an SRS resource set indicated by the base station; receive from the base station an SRS resource indicator indicating one or more SRS resources in the SRS resource set; and determine a combined transmit beam from the multiple beams based at least in part on the SRS resource indicator.

[0015] In some aspects, a non-transient 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 base station, cause the base station to: determine, at least in part, a set of SRS resources to be provided to the UE based on feedback of one or more signals transmitted to a UE; transmit to the UE an indication of the SRS resource set for use in beam training; determine, at least in part, one or more SRS resources for the UE from the SRS resource set based on measurements of SRS received from the UE via the SRS resource set on multiple beams; transmit to the UE an SRS resource indicator indicating the one or more SRS resources in the SRS resource set; and receive communication from the UE on a combined transmit beam of multiple beams based at least in part on the one or more SRS resources.

[0016] In some aspects, an apparatus for wireless communication includes: means for transmitting SRS to a base station on a plurality of beams using an SRS resource set indicated by a base station; means for receiving from the base station an SRS resource indicator indicating one or more SRS resources in the SRS resource set; and means for determining a combined transmit beam from the plurality of beams based at least in part on the SRS resource indicator.

[0017] In some aspects, an apparatus for wireless communication includes: means for determining, at least in part, a set of SRS resources to be provided to the UE based on feedback of one or more signals transmitted to the UE; means for transmitting to the UE an indication of the SRS resource set for use in beam training; means for determining, at least in part, one or more SRS resources for the UE from the SRS resource set based on measurements of SRS received from the UE via the SRS resource set on multiple beams; means for transmitting to the UE an SRS resource indicator indicating the one or more SRS resources in the SRS resource set; and means for receiving communication from the UE on a combined transmit beam of multiple beams based at least in part on the one or more SRS resources.

[0018] The aspects generally include, as substantially described herein with reference to the accompanying drawings and description, methods, apparatus, systems, computer program products, non-transient computer-readable media, user equipment, base stations, wireless communication equipment, and / or processing systems.

[0019] The foregoing has broadly outlined the features and technical advantages of the examples according to this disclosure in an effort to facilitate a better understanding of the following detailed description. Additional features and advantages will be described thereafter. The disclosed concepts and specific examples can be readily used as the basis for modifying or designing other structures for implementing the same purposes as this disclosure. Such equivalent constructions do not depart from the scope of the appended claims. The characteristics of the concepts disclosed herein, in both their organization and manner of operation, and their associated advantages, will be better understood by considering the following description in conjunction with the accompanying drawings. Each drawing is provided for illustrative and descriptive purposes and not for defining limitations on the claims. Brief description of the attached diagram

[0021] To gain a more detailed understanding of the features described above in this disclosure, reference can be made to various aspects of the above brief overview, some of which are illustrated in the accompanying drawings. However, it should be noted that the drawings illustrate only certain typical aspects of this disclosure and should not be considered as limiting its scope, as other equivalent aspects are permissible in this description. Identical reference numerals in different drawings may identify the same or similar elements.

[0022] Figure 1 This is a diagram illustrating examples of wireless networks according to various aspects of this disclosure.

[0023] Figure 2 This is a diagram illustrating an example of communication between a base station and a user equipment (UE) in a wireless network according to various aspects of this disclosure.

[0024] Figure 3 This is a diagram illustrating an example of multiple subarrays for a UE according to various aspects of this disclosure.

[0025] Figure 4 This is a diagram illustrating examples of multiple deflected beams according to various aspects of this disclosure.

[0026] Figure 5 This is a diagram illustrating an example of a composite uplink beam according to various aspects of this disclosure.

[0027] Figure 6 This is a diagram illustrating an example of a composite uplink beam according to various aspects of this disclosure.

[0028] Figure 7 This is a diagram illustrating, for example, an example process performed by a UE according to various aspects of this disclosure.

[0029] Figure 8 This is a diagram illustrating, for example, an example process performed by a base station according to various aspects of this disclosure.

[0030] Detailed description

[0031] 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 practice. Furthermore, the scope of this disclosure is intended to cover such apparatuses 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.

[0032] 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.

[0033] It should be noted that although the aspects may be described herein using terms commonly associated with 5G or NR radio access technology (RAT), the aspects of this disclosure may be applied to other RATs, such as 3G RAT, 4G RAT, and / or RATs after 5G (e.g., 6G).

[0034] Figure 1 This is a diagram illustrating an example of a wireless network 100 according to various aspects of this disclosure. The wireless network 100 may be a 5G (NR) network, an LTE network, etc., or may include elements thereof. The wireless network 100 may include several base stations 110 (shown as BS 110a, BS 110b, BS 110c, and BS 110d) and other network entities. A base station (BS) is an entity that communicates with a user equipment (UE) and may also be referred to as an NR BS, B-node, gNB, 5G B-node (NB), access point, transmit / receive point (TRP), etc. Each BS may provide communication coverage for a specific geographic area. In 3GPP, the term "cell" may refer to the coverage area of ​​a BS and / or the BS subsystem serving that coverage area, depending on the context in which the term is used.

[0035] A BS can provide communication coverage for macrocells, picocells, femtocells, and / or another type of cell. Macrocells can cover a relatively large geographic area (e.g., a radius of several kilometers) and allow unrestricted access by UEs with a service subscription. Picocells can cover a relatively small geographic area and allow unrestricted access by UEs with a service subscription. Femtocells can cover a relatively small geographic area (e.g., a residential area) and allow restricted access by UEs associated with that femtocell (e.g., UEs in a Closed Subscriber Group (CSG)). A BS used for macrocells may be referred to as a macro BS. A BS used for picocells may be referred to as a pico BS. A BS used for femtocells may be referred to as a femto BS or a home BS. Figure 1 In the example shown, BS 110a can be a macro BS for macro cell 102a, BS 110b can be a pico BS for pico cell 102b, and BS 110c can be a femto BS for femto cell 102c. A BS can support one or more (e.g., three) cells. The terms “eNB,” “base station,” “NR BS,” “gNB,” “TRP,” “AP,” “B node,” “5G NB,” and “cell” are used interchangeably herein.

[0036] In some respects, the cell need not be stationary, and the geographical area of ​​the cell can move depending on the location of the mobile BS. In some respects, BSs can interconnect with each other and / or interconnect to one or more other BSs or network nodes (not shown) in the wireless network 100 using any suitable transport network through various types of backhaul interfaces (such as direct physical connections, virtual networks, etc.).

[0037] The wireless network 100 may also include a relay station. A relay station is an entity capable of receiving data transmissions from an upstream station (e.g., a BS or a UE) and transmitting those data transmissions to a downstream station (e.g., a UE or a BS). A relay station may also be a UE capable of relaying transmissions for other UEs. Figure 1 In the example shown, relay BS 110d can communicate with macro BS 110a and UE 120d to facilitate communication between BS 110a and UE 120d. A relay BS can also be referred to as a relay station, relay base station, relay, etc.

[0038] Wireless network 100 can be a heterogeneous network comprising different types of Base Stations (BSs) (e.g., macro BSs, pico BSs, femto BSs, relay BSs, etc.). These different types of BSs may have different transmit power levels, different coverage areas, and different effects on interference in wireless network 100. For example, macro BSs may have high transmit power levels (e.g., 5 to 40 watts), while pico BSs, femto BSs, and relay BSs may have lower transmit power levels (e.g., 0.1 to 2 watts).

[0039] Network controller 130 can be coupled to a set of Base Stations (BSs) and can provide coordination and control over these BSs. Network controller 130 can communicate with each BS via backhaul. These BSs can also communicate with each other directly or indirectly, for example, via wireless or wired backhaul.

[0040] UE 120 (e.g., 120a, 120b, 120c) may be distributed throughout the wireless network 100, and each UE may be stationary or mobile. UE may also be referred to as an access terminal, terminal, mobile station, subscriber unit, station, etc. UE may be a cellular phone (e.g., a smartphone), personal digital assistant (PDA), wireless modem, wireless communication device, handheld device, laptop computer, cordless phone, wireless local loop (WLL) station, tablet, camera, gaming device, netbook, smartbook, ultrabook, medical device or equipment, biometric sensor / device, wearable device (smartwatch, smart clothing, smart glasses, smart wristband, smart jewelry (e.g., smart ring, smart bracelet)), entertainment device (e.g., music or video device, or satellite radio), vehicle component or sensor, smart meter / sensor, industrial manufacturing equipment, GPS device, or any other suitable device configured to communicate via wireless or wired media.

[0041] Some UEs can be considered Machine-Type Communication (MTC) UEs, or evolved or enhanced Machine-Type Communication (eMTC) UEs. MTC and eMTC UEs include, for example, robots, drones, remote devices, sensors, meters, monitors, location tags, etc., which can communicate with a base station, another device (e.g., a remote device), or some other entity. Wireless nodes can provide connectivity to or to a network (e.g., a wide area network such as the Internet) or a cellular network, for example, via wired or wireless communication links. 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). UE 120 can be included within a housing that houses the components of UE 120, such as processor components, memory components, etc. In some respects, the processor components and memory components can be coupled together. For example, the processor components (e.g., one or more processors) and memory components (e.g., memory) can be operatively coupled, communicatively coupled, electronically coupled, electrically coupled, etc.

[0042] Generally, any number of wireless networks can be deployed in a given geographical area. Each wireless network can support a specific RAT and can operate on one or more frequencies. A RAT may also be referred to as a radio technology, air interface, etc. A frequency may also be referred to as a carrier, frequency channel, etc. Each frequency can support a single RAT in a given geographical area to avoid interference between wireless networks using different RATs. In some cases, NR or 5G RAT networks can be deployed.

[0043] In some respects, two or more UEs 120 (e.g., shown as UE 120a and UE 120e) may communicate directly using one or more sidelink channels (e.g., without using base station 110 as an intermediary). For example, UE 120 may communicate using peer-to-peer (P2P) communication, device-to-device (D2D) communication, vehicle-to-everything (V2X) protocols (e.g., which may include vehicle-to-vehicle (V2V) protocols, vehicle-to-infrastructure (V2I) protocols, etc.), mesh networks, etc. In this scenario, UE 120 may perform scheduling operations, resource selection operations, and / or other operations described elsewhere herein as being performed by base station 110.

[0044] Devices of the wireless network 100 can communicate using the electromagnetic spectrum, which can be subdivided into various categories, bands, channels, etc., based on frequency or wavelength. For example, devices of the wireless network 100 can communicate using an operating band with a first frequency range (FR1) and / or an operating band with a second frequency range (FR2), the first frequency range (FR1) spanning from 410 MHz to 7.125 GHz and the second frequency range (FR2) spanning from 24.25 GHz to 52.6 GHz. The frequencies between FR1 and FR2 are sometimes referred to as intermediate frequency bands. Although a portion of FR1 is greater than 6 GHz, FR1 is often referred to as the "sub-6 GHz band." Similarly, although different from the extremely high frequency (EHF) band (30 GHz – 300 GHz) designated as the "millimeter wave" band by the International Telecommunication Union (ITU), FR2 is often referred to as the "millimeter wave" band. Therefore, unless otherwise stated, it should be understood that, if used herein, the terms "sub-6 GHz" and the like can broadly refer to frequencies less than 6 GHz, frequencies within FR1, and / or intermediate frequency band frequencies (e.g., greater than 7.125 GHz). Similarly, unless otherwise stated, it should be understood that, if used herein, the terms "millimeter wave" and the like can broadly refer to frequencies within the EHF band, frequencies within FR2, and / or intermediate frequency band frequencies (e.g., less than 24.25 GHz). It is conceivable that the frequencies included in FR1 and FR2 can be modified, and the techniques described herein are applicable to those modified frequency ranges.

[0045] As indicated above, Figure 1 This is provided as an example. Other examples may differ from the one provided. Figure 1 The example described.

[0046] Figure 2 This is a diagram illustrating an example 200 of communication between a base station 110 and a UE 120 in a wireless network 100 according to various aspects of this disclosure. The base station 110 may be equipped with T antennas 234a to 234t, and the UE 120 may be equipped with R antennas 252a to 252r, wherein generally T ≥ 1 and R ≥ 1.

[0047] At base station 110, transmit processor 220 can receive data destined for one or more UEs from data source 212, select one or more modulation and coding schemes (MCS) for each UE based at least in part on channel quality indicators (CQI) received from each UE, process (e.g., encode and modulate) the data destined for each UE based at least in part on the MCS selected for each UE, and provide data symbols for all UEs. Transmit processor 220 can also process system information (e.g., semi-static resource allocation information (SRPI) and other information) and control information (e.g., CQI requests, grants, upper-layer signaling, etc.), and provide overhead symbols and control symbols. Transmit processor 220 can also generate reference symbols for reference signals (e.g., cell-specific reference signals (CRS)), demodulation reference signals (DMRS), etc.) and synchronization signals (e.g., primary synchronization signal (PSS) and secondary synchronization signal (SSS)). The transmit (TX) multiple-input multiple-output (MIMO) processor 230 can perform spatial processing (e.g., precoding) on ​​data symbols, control symbols, overhead symbols, and / or reference symbols, where applicable, and can provide T output symbol streams to T modulators (MODs) 232a to 232t. Each modulator 232 can process its own output symbol stream (e.g., for OFDM, etc.) to obtain an output sample stream. Each modulator 232 can further process (e.g., convert to analog, amplify, filter, and up-convert) the output sample stream to obtain a downlink signal. The T downlink signals from modulators 232a to 232t can be transmitted via T antennas 234a to 234t, respectively.

[0048] At UE 120, antennas 252a to 252r can receive downlink signals from base station 110 and / or other base stations and can provide the received signals to demodulators (DEMODs) 254a to 254r respectively. Each demodulator 254 can condition (e.g., filter, amplify, downconvert, and digitize) the received signal to obtain an input sample. Each demodulator 254 can further process the input sample (e.g., for OFDM, etc.) to obtain received symbols. MIMO detector 256 can obtain the received symbols from all R demodulators 254a to 254r, perform MIMO detection on these received symbols where applicable, and provide detected symbols. Receiver processor 258 can process (e.g., demodulate and decode) these detected symbols, provide the decoded data for UE 120 to data sink 260, and provide the decoded control information and system information to controller / processor 280. The term "controller / processor" can refer to one or more controllers, one or more processors, or a combination thereof. The channel processor can determine the Reference Received Power (RSRP), Received Signal Strength Indicator (RSSI), Reference Received Quality (RSRQ), Channel Quality Indicator (CQI), and so on. In some respects, one or more components of the UE 120 may be included in the housing 284.

[0049] Network controller 130 may include communication unit 294, controller / processor 290, and memory 292. Network controller 130 may include one or more devices, such as those in the core network. Network controller 130 may communicate with base station 110 via communication unit 294.

[0050] On the uplink, at UE 120, transmit processor 264 can receive and process data from data source 262 and control information from controller / processor 280 (e.g., reports including RSRP, RSSI, RSRQ, CQI, etc.). Transmit processor 264 can also generate reference symbols for one or more reference signals. Symbols from transmit processor 264 may be pre-encoded by TX MIMO processor 266 where applicable, further processed by modulators 254a to 254r (e.g., for DFT-s-OFDM, CP-OFDM, etc.), and transmitted to base station 110. In some aspects, UE 120 includes a transceiver. The transceiver may include (e.g.) antenna 252, modulator and / or demodulator 254, MIMO detector 256, receive processor 258, transmit processor 264, and / or any combination of TX MIMO processor 266. The transceiver can be used by a processor (e.g., controller / processor 280) and memory 282 to perform aspects of any of the methods described herein, for example, as referenced Figure 3-8 As described.

[0051] At base station 110, uplink signals from UE 120 and other UEs can be received by antenna 234, processed by demodulator 232, detected by MIMO detector 236 where applicable, and further processed by receiver processor 238 to obtain decoded data and control information transmitted by UE 120. Receiver processor 238 can provide the decoded data to data sink 239 and the decoded control information to controller / processor 240. Base station 110 may include communication unit 244 and communicate with network controller 130 via communication unit 244. Base station 110 may include scheduler 246 to schedule UE 120 for downlink and / or uplink communication. In some aspects, base station 110 includes a transceiver. The transceiver may include any combination of antenna 234, modulator and / or demodulator 232, MIMO detector 236, receiver processor 238, transmitter 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 aspects of any of the methods described herein, for example, as referenced Figure 3-8 As described.

[0052] 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 synthetic uplink composite beamforming, as described elsewhere in this document. 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 7 The process 700 Figure 8 The operation of process 800 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, program code, etc.) for wireless communication. For example, when these one or more instructions are executed by one or more processors of base station 110 and / or UE 120 (e.g., directly, or after compilation, conversion, interpretation, etc.), they may cause the one or more processors, UE 120, and / or base station 110 to perform or direct, for example... Figure 7 The process 700 Figure 8 The process 800, and / or other processes as described herein. In some respects, the execution instructions may include run instructions, translate instructions, compile instructions, interpret instructions, etc.

[0053] In some aspects, UE 120 may include means for transmitting SRS to a base station on multiple beams using a set of detection reference signal (SRS) resources indicated by the base station; means for receiving from the base station an SRS resource indicator indicating one or more SRS resources in the SRS resource set; and means for determining a combined transmit beam from the multiple beams based at least in part on the SRS resource indicator. In some aspects, such means may include combining... 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.

[0054] In some aspects, base station 110 may include means for determining, at least in part, an SRS resource set to be provided to the UE based on feedback of one or more signals transmitted to the UE; means for transmitting to the UE an indication of the SRS resource set for use in beam training; means for determining, at least in part, one or more SRS resources for the UE from the SRS resource set based on measurements of SRS received from the UE via the SRS resource set on multiple beams; means for transmitting to the UE an SRS resource indicator indicating the one or more SRS resources in the SRS resource set; means for receiving communication from the UE on a combined transmit beam of multiple beam combinations based at least in part on the one or more SRS resources; and so on. In some aspects, such means may include a combination of Figure 2 One or more components of the described base station 110, such as antenna 234, DEMOD 232, MIMO detector 236, receiver processor 238, controller / processor 240, transmitter processor 220, TX MIMO processor 230, MOD 232, antenna 234, etc.

[0055] although Figure 2 The boxes in the diagram are interpreted as different components, but the functions described above with respect to these boxes can be implemented by a single hardware component, software component, or combination of components. For example, the functions described with respect to transmit processor 264, receive processor 258, and / or TX MIMO processor 266 can be performed by controller / processor 280 or under the control of controller / processor 280.

[0056] As indicated above, Figure 2 This is provided as an example. Other examples may differ from the one provided. Figure 2 The example described.

[0057] Figure 3This is an illustration of example 300 of multiple subarrays for a UE according to various aspects of this disclosure.

[0058] Figure 3 A UE with multiple subarrays at different locations is illustrated. Each subarray can form a beam in a specific direction. Beamforming in the frequency range FR2 can be based on guided energy in a single direction and may include hierarchical beamforming with one or more procedures. Such procedures may involve measurements of different beams and, at least in part, selection of the beams for transmission and / or reception based on these measurements. In some aspects, the UE can transmit multiple beams from multiple subarrays simultaneously.

[0059] As indicated above, Figure 3 This is provided as an example. Other examples may differ from the one provided. Figure 3 The example described.

[0060] Figure 4 These are illustrations of examples 400, 402 of multiple deflected beams according to various aspects of this disclosure.

[0061] A beam may include one or more transmit energy clusters, and beams may have different beamwidths. A beam with a wider beamwidth may include multiple clusters within its coverage area, while a beam with a narrower beamwidth may not include multiple clusters. Multiple energy clusters or multiple beams may arrive at the receiver from different angles due to beam reflections away from objects such as concrete walls, metal buildings, or glass windows.

[0062] The UE can detect energy clusters from different angles or spatial directions of the channel. The UE can select energy clusters from specific directions to receive downlink communication. The UE can also determine which uplink beam to transmit communication on in the same direction, such as... Figure 4 Example 400 illustrates this. However, if the UE transmits in only one direction on a single uplink beam, the UE may be unable to transmit uplink communication with a strong signal. As a result, communication with the base station may be degraded. The UE and the base station may waste retransmission signals or otherwise account for the processing and signaling resources of the degraded communication.

[0063] Based on the aspects described herein, a UE can synthesize an uplink composite beam from multiple beams that may deflect away from the target, leading to the base station. The UE can determine the uplink composite beam at least in part based on beam training using SRS. For example, the base station can indicate an SRS resource set to the UE, and the UE can transmit SRS within that SRS resource set. The base station can determine which SRS have higher signal strength and / or higher signal-to-interference-plus-noise ratio (SINR) and transmit SRS indicators for the SRS resources associated with the SRS having higher signal strength or SINR. The UE can form the uplink composite beam from multiple beams at least in part based on the SRS indicators, such as... Figure 4 Example 402 illustrates this. Accordingly, uplink communication transmitted on the uplink composite beam (and uplink communication reflected from the object) can be received with a stronger overall signal. As a result, uplink communication to the base station is improved, allowing the UE and base station to save processing and signaling resources that would otherwise be consumed for retransmission or degraded communication.

[0064] As indicated above, Figure 4 These are provided as examples. Other examples may differ from those provided. Figure 4 The example described.

[0065] Figure 5 This is a diagram illustrating example 500 of a composite uplink beamforming according to various aspects of this disclosure. (See diagram for example.) Figure 5 As shown, example 500 includes base station (BS) 510 (e.g., Figure 1 and Figure 2 The BS 110 and UE 520 described in the document (e.g., Figure 1 and Figure 2 Communication between BS 510 and UE 520 as depicted herein. In some respects, BS 510 and UE 520 may be included in a wireless network (such as wireless network 100). BS 510 and UE 520 may communicate on a wireless access link, which may include uplink and downlink.

[0066] As shown by reference numeral 530, the BS 510 may determine the set of SRS resources to be provided to the UE based at least in part on feedback to one or more signals transmitted to the UE. Feedback may include feedback to access procedures, feedback to random access channel procedures, channel state information report indicators (CRI), etc. The BS 510 may transmit to the UE an indication of the set of SRS resources to be used in beam training, as shown by reference numeral 535.

[0067] UE 520 can use the SRS resource set for beam training. Beam training may involve determining which beams are optimal for communication (e.g., determining a ranking or list of beams). As shown by reference numeral 540, UE 520 can use the SRS resource set to transmit SRS on multiple beams, which may involve SRS received on multiple beams. Some SRS resources may be associated with beams reflected off concrete buildings, and some SRS resources may be associated with another beam reflected off glass windows of different buildings.

[0068] As indicated above, Figure 5 This is provided as an example. Other examples may differ from the one provided. Figure 5 The example described.

[0069] Figure 6 This is a diagram illustrating example 600 of a composite uplink beam according to various aspects of this disclosure. Figure 6 It is a combination Figure 5 This is a continuation of the operations described in BS 510 and UE 520.

[0070] As shown by reference numeral 605, BS 510 may determine one or more SRS resources for UE 520 from an indicated SRS resource set indicated to UE 520, based at least in part on measurements of SRS received from UE 520 on multiple beams. These measurements may include signal strength measurements, SINR measurements, etc. UE 520 may have the ability to report the top K beams in terms of RSRP and / or SINR. BS 510 may determine SRS resources at least in part based on downlink beam training, initial acquisition signal, random access channel (RACH) messages, channel state information reference signal (CSI-RS), etc. In some aspects, BS 510 may request UE 520 to use uplink beams quasi-co-located with the downlink reference signal to transmit the SRS resource set.

[0071] As indicated by reference numeral 610, BS 510 may transmit an SRS resource indicator to UE 520. The SRS resource indicator may indicate SRS resources determined by BS 510 from an SRS resource set. UE 520 may determine, at least in part, an uplink composite beam composed of combinations of multiple beams based on the SRS resource indicator, as indicated by reference numeral 615. UE 520 may determine which beams to combine based, at least in part, on measurements performed by UE 520. For example, UE 520 may combine beams with higher signal strength, higher SINR, higher reliability, higher stability, etc. UE 520 may also combine beam pairs that can be considered complementary.

[0072] As indicated by reference numeral 620, BS 510 can receive communication on an uplink composite beam. For example, BS 510 can receive information about the uplink composite beam from UE 520 and can receive uplink communication by selecting a receive beam at least partially based on that uplink composite beam. BS 510 can combine one or more of the best CSI-RS Resource Indicator (CRI) or Transport Configuration Indicator (TCI) states reported by UE 520 (e.g., the top K best). BS 510 can be implemented using a Type II codebook. In some aspects, BS 510 can transmit downlink communication on a downlink composite beam formed by one or more beams (e.g., the top K best CRI or TCI states, or a subset of the top K best CRI or TCI states), which corresponds to the uplink composite beam, as indicated by reference numeral 625.

[0073] In some aspects, BS 510 may determine combination coefficients used in conjunction with SRS resources and provide them to UE 520. BS 510 may determine the combination coefficients at least in part based on measurements of signal strength and correlate these combination coefficients with beam weights. This may be performed as part of or in conjunction with reference numeral 605. UE 520 may use the combination coefficients to form uplink composite beams. In some aspects, UE 520 may determine that beams can be boosted or improved through specific combination coefficients. For example, a beam with a weak signal but good SINR may be boosted or weighted more heavily for use in an uplink composite beam with combination coefficients. In some aspects, UE 520 may determine (as part of reference numeral 615) the uplink composite beam as a linear combination of the beam weights of individual beams, which is generated using combination coefficients. As a result, the uplink composite beam may be a combination of beams that provide greater signal strength and / or higher accuracy. Uplink composite beams improve communication between BS 510 and UE 520.

[0074] As indicated above, Figure 6 This is provided as an example. Other examples may differ from the one provided. Figure 6 The example described.

[0075] Figure 7 This is a diagram illustrating, for example, an example process 700 performed by a UE according to various aspects of this disclosure. Example process 700 is where the UE (e.g., Figure 1 and Figure 2 The UE 120 depicted in the text Figure 4 The UE depicted in Figure 5 and Figure 6 Examples of operations performed by UE520 (e.g., the one depicted in the text) associated with synthetic uplink composite beams.

[0076] like Figure 7 As shown, in some aspects, process 700 may include transmitting SRS to the base station on multiple beams using an SRS resource set indicated by the base station (block 710). For example, a UE (e.g., using a receive processor 258, a transmit processor 264, a controller / processor 280, a memory 282, etc.) may transmit SRS to the base station on multiple beams using an SRS resource set indicated by the base station, as described above.

[0077] like Figure 7 As further illustrated, in some aspects, process 700 may include receiving from the base station an SRS resource indicator (block 720) indicating one or more SRS resources in the SRS resource set. For example, a UE (e.g., using a receive processor 258, a transmit processor 264, a controller / processor 280, a memory 282, etc.) may receive from the base station an SRS resource indicator indicating one or more SRS resources in the SRS resource set, as described above.

[0078] like Figure 7 As further illustrated, in some aspects, process 700 may include determining a combined transmit beam from the plurality of beams based at least in part on the SRS resource indicator (block 730). For example, a UE (e.g., using a receive processor 258, a transmit processor 264, a controller / processor 280, a memory 282, etc.) may determine the combined transmit beam from the plurality of beams based at least in part on the SRS resource indicator, as described above.

[0079] Process 700 may include additional aspects, such as any single aspect or any combination of aspects described below and / or in conjunction with one or more other processes described elsewhere herein.

[0080] In a first aspect, process 700 includes using two or more of the plurality of beams as a combined transmit beam to transmit communication to the base station.

[0081] In a second aspect, either alone or in combination with the first aspect, process 700 includes receiving one or more combination coefficients across the one or more SRS resources from the base station, wherein determining the combined transmit beam includes further determining the combined transmit beam based at least in part on the one or more combination coefficients.

[0082] In a third aspect, determining the combined transmit beam, either alone or in combination with one or more of the first and second aspects, includes determining beam weights for the respective beams among the plurality of beams and generating the combined transmit beam as a linear combination of the beam weights.

[0083] In the fourth aspect, generating the combined transmit beam as a linear combination of beam weights, either alone or in combination with one or more of the first to third aspects, includes using one or more combination coefficients to generate the linear combination of beam weights.

[0084] In the fifth aspect, either alone or in combination with one or more of the first to fourth aspects, one or more combination coefficients of the combined transmit beam are weighted with respect to the strongest beam among the plurality of beams and the second strongest beam among the plurality of beams.

[0085] In the sixth aspect, either alone or in combination with one or more of the first to fifth aspects, one or more combination coefficients of the combined transmit beam are weighted with respect to the highest quality or reliability beam among the plurality of beams and the second highest quality or reliability beam among the plurality of beams.

[0086] In the seventh aspect, determining the combined transmit beam, either alone or in combination with one or more of the first to sixth aspects, includes determining the two or more beams of the plurality of beams as the combined transmit beam based at least in part on one or more of the signal strength or signal-to-noise ratio of each of the two or more beams.

[0087] In the eighth aspect, alone or in combination with one or more of the first to seventh aspects, the combined transmit beam comprises at least two complementary beams from the plurality of beams. In some aspects, the combined transmit beam will be transmitted at one or more frequencies of FR2.

[0088] In the ninth aspect, alone or in combination with one or more of the first to eighth aspects, the SRS resource set includes SRS resources quasi-co-located with different downlink reference signals.

[0089] although Figure 7 An example box of process 700 is shown, but in some respects, process 700 may include... Figure 7 The boxes depicted in the process are compared to additional boxes, fewer boxes, different boxes, or boxes arranged differently. Additionally or alternatively, two or more boxes in process 700 can be executed in parallel.

[0090] Figure 8 This is a diagram illustrating, for example, an example process 800 performed by a base station according to various aspects of this disclosure. Example process 800 is where a base station (e.g., Figure 1 and Figure 2 Base station 110 depicted in the text Figure 4 The base station depicted in the text Figure 5 and Figure 6 Examples of operations performed by BS 510 (e.g.) associated with synthetic uplink composite beams, as depicted in the diagram.

[0091] like Figure 8 As shown, in some aspects, process 800 may include determining the set of SRS resources to be provided to the UE based at least in part on feedback to one or more signals transmitted to the UE (block 810). For example, a base station (e.g., using transmit processor 220, receive processor 238, controller / processor 240, memory 242, etc.) may determine the set of SRS resources to be provided to the UE based at least in part on feedback to one or more signals transmitted to the UE, as described above.

[0092] like Figure 8 As further illustrated, in some aspects, process 800 may include transmitting to the UE an indication of the SRS resource set for use in beam training (block 820). For example, a base station (e.g., using transmit processor 220, receive processor 238, controller / processor 240, memory 242, etc.) may transmit the indication of the SRS resource set to the UE for use in beam training, as described above.

[0093] like Figure 8 As further illustrated, in some aspects, process 800 may include determining one or more SRS resources for the UE from the SRS resource set based at least in part on measurements of SRS received from the UE via the SRS resource set on multiple beams (block 830). For example, a base station (e.g., using transmit processor 220, receive processor 238, controller / processor 240, memory 242, etc.) may determine one or more SRS resources for the UE from the SRS resource set based at least in part on measurements of SRS received from the UE via the SRS resource set on multiple beams, as described above.

[0094] like Figure 8 As further illustrated, in some aspects, process 800 may include transmitting an SRS resource indicator to the UE, the SRS resource indicator indicating one or more SRS resources in the SRS resource set (block 840). For example, a base station (e.g., using transmit processor 220, receive processor 238, controller / processor 240, memory 242, etc.) may transmit the SRS resource indicator to the UE, the SRS resource indicator indicating one or more SRS resources in the SRS resource set, as described above.

[0095] like Figure 8As further illustrated, in some aspects, process 800 may include receiving communication from the UE on a combined transmit beam of multiple beam combinations, at least in part based on the one or more SRS resources (block 850). For example, a base station (e.g., using transmit processor 220, receive processor 238, controller / processor 240, memory 242, etc.) may receive communication from the UE on a combined transmit beam of multiple beam combinations, at least in part based on the one or more SRS resources, as described above.

[0096] Process 800 may include additional aspects, such as any single aspect or any combination of aspects described below and / or in conjunction with one or more other processes described elsewhere herein.

[0097] In a first aspect, process 800 includes determining one or more combination coefficients across the one or more SRS resources to be used by the UE to determine the combined transmit beam and transmitting the one or more combination coefficients to the UE.

[0098] In the second aspect, determining the one or more combination coefficients, either alone or in combination with the first aspect, includes determining the one or more combination coefficients based at least in part on the received power or signal-to-noise ratio of the reference signal used for one or more of the plurality of beams.

[0099] In the third aspect, either alone or in combination with one or more of the first and second aspects, the feedback includes one or more of the following: feedback for random access channel procedures, feedback for initial access procedures, or channel state information reference signals.

[0100] In the fourth aspect, the determination of the one or more SRS resources and the transmission of the SRS resource indicator, either alone or in combination with one or more of the first to third aspects, includes the use of a Type II codebook, and the combined transmit beam is received at one or more frequencies in FR2.

[0101] In the fifth aspect, either alone or in combination with one or more of the first to fourth aspects, the SRS resource set includes SRS resources quasi-co-located with different downlink reference signals.

[0102] although Figure 8 An example box of process 800 is shown, but in some respects, process 800 may include... Figure 8 The boxes depicted in the process are compared to additional boxes, fewer boxes, different boxes, or boxes arranged differently. Additionally or alternatively, two or more boxes of process 800 can be executed in parallel.

[0103] The foregoing disclosure provides explanations and descriptions, but is not intended to be exhaustive or to limit the aspects to the precise forms disclosed. Modifications and variations may be made in light of the foregoing disclosure or may be obtained through practice.

[0104] As used herein, the term "component" is intended to be interpreted broadly as hardware, firmware, and / or a combination of hardware and software. As used herein, a processor is implemented using hardware, firmware, and / or a combination of hardware and software. It will be apparent that the systems and / or methods described herein can be implemented in various forms of hardware, firmware, and / or hardware and software combinations. The actual dedicated control hardware or software code used to implement these systems and / or methods is not limiting in any way. Therefore, the operation and behavior of these systems and / or methods are described herein without reference to any specific software code—it is understood that software and hardware can be designed to implement these systems and / or methods, at least in part, based on the description herein.

[0105] As used in this article, depending on the context, satisfying the threshold can mean a value 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, etc.

[0106] Although specific combinations of features are described in the claims and / or disclosed in the specification, these combinations are not intended to limit the disclosure of aspects. In fact, many of these features can be combined in ways not specifically described in the claims and / or not disclosed in the specification. Although each dependent claim listed below may be directly dependent on only one claim, the disclosure of aspects includes each dependent claim being combined with each other claim in this set of claims. The phrase “at least one of” refers to any combination of these items, including single members. As an example, “at least one of a, b, or c” is intended to cover: a, b, c, ab, ac, bc, and abc, as well as any combination having multiple identical elements (e.g., aa, aaa, aab, aac, abb, acc, bb, bbb, bbc, cc, and ccc, or any other ordering of a, b, and c).

[0107] The elements, actions, or instructions used herein should not be construed as critical or necessary unless explicitly stated otherwise. Furthermore, as used herein, the articles “a” and “a certain” are intended to include one or more items and may be used interchangeably with “one or more.” Additionally, as used herein, the article “the” is intended to include one or more items referenced in conjunction with the article “the” and may be used interchangeably with “one or more.” Furthermore, as used herein, the terms “set” and “group” are intended to include one or more items (e.g., related items, unrelated items, combinations of related and unrelated items, etc.) and may be used interchangeably with “one or more.” Where only one item is intended, the phrase “only one” or similar language is used. Moreover, as used herein, the terms “have,” “contain,” “include,” etc., are intended to be open-ended terms. Additionally, the phrase “based on” is intended to mean “at least partially based on” unless otherwise explicitly stated. Moreover, as used herein, the term “or” is intended to be inclusive when used in a sequence and may be used interchangeably with “and / or” unless otherwise explicitly stated (e.g., in combination with “either of” or “only one of”).

Claims

1. A wireless communication method performed by a user equipment (UE), comprising: SRS is transmitted to the base station on multiple beams using a probe reference signal (SRS) resource set indicated by the base station; Receive from the base station an SRS resource indicator that indicates one or more SRS resources in the SRS resource set; Receive multiple combination coefficients across the one or more SRS resources from the base station; as well as The combined transmit beam is determined from the plurality of beams based at least in part on the SRS resource indicator and at least in part on the plurality of combination coefficients; Determining the combined transmit beam includes determining beam weights for corresponding beams among the plurality of beams and generating the combined transmit beam as a linear combination of the beam weights, and generating the combined transmit beam as a linear combination of the beam weights includes using the plurality of combination coefficients to generate the linear combination of the beam weights. and One or more of the multiple combination coefficients of the combined transmit beam are weighted for the strongest beam and the second strongest beam among the multiple beams, and one or more of the multiple combination coefficients of the combined transmit beam are weighted for the highest quality beam and the second highest quality beam among the multiple beams.

2. The method of claim 1, further comprising using two or more of the plurality of beams as the combined transmit beam to transmit communication to the base station.

3. The method of claim 1, wherein determining the combined transmit beam comprises determining the two or more beams of the plurality of beams as the combined transmit beam based at least in part on one or more of the signal strength or signal-to-noise ratio of each of the two or more beams.

4. The method of claim 1, wherein the combined transmit beam comprises at least two beams that are complementary to each other among the plurality of beams.

5. The method of claim 4, wherein the SRS resource set includes SRS resources quasi-co-located with different downlink reference signals.

6. A wireless communication method performed by a base station, comprising: The set of probe reference signals (SRS) resources to be provided to the UE is determined at least in part based on feedback to one or more signals transmitted to the user equipment (UE). Instructions for the SRS resource set are transmitted to the UE for use in beam training; One or more SRS resources for the UE are determined from the SRS resource set, at least in part, based on measurements of SRS received from the UE via the SRS resource set on multiple beams. Transmit an SRS resource indicator to the UE, the SRS resource indicator indicating one or more SRS resources in the SRS resource set; Determine multiple combination coefficients across one or more SRS resources, the multiple combination coefficients being used by the UE to determine a linear combination of combined transmit beams as beam weights of corresponding beams among the multiple beams, wherein determining the multiple combination coefficients includes determining the one or more combination coefficients based at least in part on the reference signal received power and signal-to-noise ratio of one or more of the multiple beams, and wherein one or more of the multiple combination coefficients of the combined transmit beams are weighted with respect to the strongest beam and the second strongest beam among the multiple beams, and one or more of the multiple combination coefficients of the combined transmit beams are weighted with respect to the highest quality beam and the second highest quality beam among the multiple beams; as well as The plurality of combination coefficients are transmitted to the UE; as well as The UE receives communication from a combined transmit beam of multiple beam combinations based at least in part on the one or more SRS resources and at least in part on the multiple combination coefficients.

7. The method of claim 6, wherein the feedback includes one or more of the following: feedback for a random access channel procedure, feedback for an initial access procedure, or a channel state information reference signal.

8. The method of claim 6, wherein determining the one or more SRS resources and transmitting the SRS resource indicator comprises using a Type II codebook, and wherein the combined transmit beam is received at one or more frequencies in FR2.

9. The method of claim 6, wherein the SRS resource set includes SRS resources quasi-co-located with different downlink reference signals.

10. A user equipment (UE) for wireless communication, comprising: Memory; as well as One or more processors operatively coupled to the memory, the memory and the one or more processors being configured to: SRS is transmitted to the base station on multiple beams using a probe reference signal (SRS) resource set indicated by the base station; Receive from the base station an SRS resource indicator that indicates one or more SRS resources in the SRS resource set; Receive multiple combination coefficients across the one or more SRS resources from the base station; as well as The combined transmit beam is determined from the plurality of beams based at least in part on the SRS resource indicator and at least in part on the plurality of combination coefficients; Determining the combined transmit beam includes determining beam weights for corresponding beams among the plurality of beams and generating the combined transmit beam as a linear combination of the beam weights, and generating the combined transmit beam as a linear combination of the beam weights includes using the plurality of combination coefficients to generate the linear combination of the beam weights. and One or more of the multiple combination coefficients of the combined transmit beam are weighted for the strongest beam and the second strongest beam among the multiple beams, and one or more of the multiple combination coefficients of the combined transmit beam are weighted for the highest quality beam and the second highest quality beam among the multiple beams.

11. The UE of claim 10, wherein the one or more processors are further configured to use two or more of the plurality of beams as the combined transmit beam to transmit communications to the base station.

12. The UE of claim 10, wherein the one or more processors are further configured to: determine the combined transmit beam by determining the two or more beams of the plurality of beams as the combined transmit beam based at least in part on one or more of the signal strength or signal-to-noise ratio of each of the two or more beams of the plurality of beams.

13. The UE of claim 10, wherein the SRS resource set includes SRS resources quasi-co-located with different downlink reference signals.

14. A base station for wireless communication, comprising: Memory; as well as One or more processors operatively coupled to the memory, the memory and the one or more processors being configured to: The set of probe reference signals (SRS) resources to be provided to the UE is determined at least in part based on feedback to one or more signals transmitted to the user equipment (UE). Instructions for the SRS resource set are transmitted to the UE for use in beam training; One or more SRS resources for the UE are determined from the SRS resource set, at least in part, based on measurements of SRS received from the UE via the SRS resource set on multiple beams. Transmit an SRS resource indicator to the UE, the SRS resource indicator indicating one or more SRS resources in the SRS resource set; Determine multiple combination coefficients across one or more SRS resources, the multiple combination coefficients being used by the UE to determine a linear combination of combined transmit beams as beam weights of corresponding beams among the multiple beams, wherein determining the multiple combination coefficients includes determining the one or more combination coefficients based at least in part on the reference signal received power and signal-to-noise ratio of one or more of the multiple beams, and wherein one or more of the multiple combination coefficients of the combined transmit beams are weighted with respect to the strongest beam and the second strongest beam among the multiple beams, and one or more of the multiple combination coefficients of the combined transmit beams are weighted with respect to the highest quality beam and the second highest quality beam among the multiple beams; as well as The plurality of combination coefficients are transmitted to the UE; as well as The UE receives communication from a combined transmit beam of multiple beam combinations based at least in part on the one or more SRS resources and at least in part on the multiple combination coefficients.

15. The base station of claim 14, wherein the feedback includes one or more of the following: feedback for a random access channel procedure, feedback for an initial access procedure, or channel state information reference signal.

16. The base station of claim 14, wherein the SRS resource set includes SRS resources quasi-co-located with different downlink reference signals.

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