Multi-panel uplink transmission with precoding

Abstract

Aspects of the present disclosure generally relate to wireless communication. In some aspects, a user equipment (UE) may receive downlink control information indicating precoding information associated with a multi-panel uplink transmission, the precoding information including at least one of a demodulation reference signal port configuration associated with the multi-panel uplink transmission, a multiple-input multiple-output (MIMO) precoding configuration associated with the multi-panel uplink transmission, or a number of layers associated with the multi-panel uplink transmission. The UE may precode the multi-panel uplink transmission at least in part based on the precoding information for transmission via a first antenna panel of the UE and a second antenna panel of the UE. The UE may use the first antenna panel and the second antenna panel to send the precoded multi-panel uplink transmission. Numerous other aspects are provided.

Description

Technical Field

[0001] In general, aspects of the present disclosure relate to wireless communication, and more particularly, to techniques and apparatus for multi-panel uplink transmission with precoding. Background Art

[0002] Wireless communication systems are widely deployed to provide various telecommunication services such as telephony, video, data, messaging, and broadcasting. A typical wireless communication system may employ multiple access techniques capable of supporting communication with multiple users by sharing available system resources (e.g., bandwidth, transmit power, etc. or a combination thereof). Examples of such multiple access techniques 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 / Advanced LTE is an enhanced set of the universal mobile telecommunications system (UMTS) mobile standard promulgated by the 3rd Generation Partnership Project (3GPP).

[0003] The above multiple access techniques have been adopted in various telecommunication standards to provide a common protocol that enables different user equipments (UEs) to communicate at the city, national, regional, and even global levels. New radio (NR) (which may also be referred to as 5G) is an evolved set of the LTE mobile standard released by 3GPP. NR is designed to better support mobile broadband Internet access by improving spectral efficiency, reducing costs, improving services, leveraging new spectrums, and better integrating with other open standards that use orthogonal frequency division multiplexing (OFDM) with cyclic prefix (CP) (CP-OFDM) on the downlink (DL) and CP-OFDM and / or SC-FDMA (e.g., also referred to as discrete Fourier transform spread OFDM (DFT-s-OFDM)) on the uplink (UL), and by supporting beamforming, multiple input multiple output (MIMO) antenna techniques, and carrier aggregation. However, with the continuous increase in the demand for mobile broadband access, there is a need to further improve LTE and NR technologies. Preferably, these improvements are applicable to other multiple access techniques and telecommunication standards that employ these techniques.

[0004] In some aspects, a precoding process including transform precoding can be applied to single-layer uplink transmissions (e.g., uplink communications transmitted using a single antenna panel of a user equipment (UE)) to reduce the peak-to-average power ratio (PAPR) associated with the uplink transmission (e.g., the PAPR can be associated with a single antenna panel). The precoding process including transform precoding can be designed to meet the PAPR requirements associated with the antenna panel of the UE. To meet the PAPR requirements of the antenna panel of the UE, the precoding process can be limited to single-layer and single-antenna-panel uplink transmissions. However, in some cases, the UE can support multi-panel operation (e.g., the UE is capable of transmitting using multiple antenna panels). The PAPR of a UE supporting multi-panel operation can be determined on a per-antenna-panel basis (e.g., each antenna panel can be associated with a PAPR value or requirement). Thus, a precoding process including transform precoding only for a single layer and a single antenna panel may not be applicable to the multi-panel uplink transmission of the UE. SUMMARY OF THE INVENTION

[0005] In some aspects, a method of wireless communication performed by a user equipment (UE) includes: receiving downlink control information (DCI) indicating precoding information associated with a multi-panel uplink transmission, the precoding information including at least one of a demodulation reference signal (DMRS) port configuration associated with the multi-panel uplink transmission, a multiple-input multiple-output (MIMO) precoding configuration associated with the multi-panel uplink transmission, or a number of layers associated with the multi-panel uplink transmission. In some aspects, the method includes: precoding the multi-panel uplink transmission at least partially based on the precoding information for transmission via a first antenna panel of the UE and a second antenna panel of the UE. In some aspects, the method includes: using the first antenna panel and the second antenna panel to transmit the precoded multi-panel uplink transmission.

[0006] In some aspects, a method of wireless communication performed by a base station includes: determining precoding information for a multi-panel uplink transmission associated with a UE, the precoding information including at least one of a DMRS port configuration associated with the multi-panel uplink transmission, a MIMO precoding configuration associated with the multi-panel uplink transmission, or a number of layers associated with the multi-panel uplink transmission. In some aspects, the method includes: sending the DCI indicating the precoding information associated with the multi-panel uplink transmission to the UE.

[0007] 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 may be configured to: receive DCI indicating precoding information associated with a multi-panel uplink transmission, the precoding information including at least one of a DMRS port configuration associated with the multi-panel uplink transmission, a MIMO precoding configuration associated with the multi-panel uplink transmission, or a number of layers associated with the multi-panel uplink transmission. In some aspects, the memory and the one or more processors may be configured to: at least partially based on the precoding information, precode the multi-panel uplink transmission for transmission via a first antenna panel of the UE and a second antenna panel of the UE. In some aspects, the memory and the one or more processors may be configured to: use the first antenna panel and the second antenna panel to transmit the precoded multi-panel uplink transmission.

[0008] 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 may be configured to: determine precoding information for a multi-panel uplink transmission associated with a UE, the precoding information including at least one of a DMRS port configuration associated with the multi-panel uplink transmission, a MIMO precoding configuration associated with the multi-panel uplink transmission, or a number of layers associated with the multi-panel uplink transmission. In some aspects, the memory and the one or more processors may be configured to: send DCI indicating the precoding information associated with the multi-panel uplink transmission to the UE.

[0009] In some aspects, a non-transitory computer-readable medium storing an instruction set for wireless communication includes one or more instructions that, when executed by one or more processors of a UE, cause the UE to perform the following operations: receive DCI indicating precoding information associated with a multi-panel uplink transmission, the precoding information including at least one of a DMRS port configuration associated with the multi-panel uplink transmission, a MIMO precoding configuration associated with the multi-panel uplink transmission, or a number of layers associated with the multi-panel uplink transmission. In some aspects, the one or more instructions, when executed by one or more processors of the UE, cause the UE to at least partially based on the precoding information, precode the multi-panel uplink transmission for transmission via a first antenna panel of the UE and a second antenna panel of the UE. In some aspects, the one or more instructions, when executed by one or more processors of the UE, cause the UE to use the first antenna panel and the second antenna panel to transmit the precoded multi-panel uplink transmission.

[0010] In some aspects, a non-transitory computer-readable medium storing instructions for wireless communication includes one or more instructions that, when executed by one or more processors of a base station, cause the base station to perform the following operations: for a multi-panel uplink transmission associated with a UE, determine precoding information, the precoding information including at least one of a DMRS port configuration associated with the multi-panel uplink transmission, a MIMO precoding configuration associated with the multi-panel uplink transmission, or a number of layers associated with the multi-panel uplink transmission. In some aspects, the one or more instructions, when executed by one or more processors of the base station, cause the base station to send to the UE a DCI indicating the precoding information associated with the multi-panel uplink transmission.

[0011] In some aspects, a device for wireless communication includes: a unit for receiving a DCI indicating precoding information associated with a multi-panel uplink transmission, the precoding information including at least one of a DMRS port configuration associated with the multi-panel uplink transmission, a MIMO precoding configuration associated with the multi-panel uplink transmission, or a number of layers associated with the multi-panel uplink transmission. In some aspects, the device may include: a unit for precoding the multi-panel uplink transmission at least partially based on the precoding information for transmission via a first antenna panel of the device and a second antenna panel of the device. In some aspects, the device may include: a unit for using the first antenna panel and the second antenna panel to send the precoded multi-panel uplink transmission.

[0012] In some aspects, a device for wireless communication includes: a unit for determining precoding information for a multi-panel uplink transmission associated with a UE, the precoding information including at least one of a DMRS port configuration associated with the multi-panel uplink transmission, a MIMO precoding configuration associated with the multi-panel uplink transmission, or a number of layers associated with the multi-panel uplink transmission. In some aspects, the device may include: a unit for sending to the UE a DCI indicating the precoding information associated with the multi-panel uplink transmission.

[0013] Aspects generally include methods, devices, systems, computer program products, non-transitory computer-readable media, user equipment, base stations, wireless communication devices, or processing systems as fully described with reference to the drawings and the specification and as illustrated by the drawings and the specification.

[0014] The features and technical advantages of examples in accordance with the present disclosure have been outlined above rather broadly in order that the detailed description thereof that follows may be better understood. Additional features and advantages will be described hereinafter. The concepts and specific examples disclosed herein may readily be utilized as a basis for modifying or designing other structures for carrying out the same purposes of the present disclosure. Such equivalent constructions do not depart from the scope of the appended claims. The characteristics of the concepts disclosed herein, both as to their organization and method of operation, as well as associated advantages, will be better understood from the following description when considered in conjunction with the accompanying drawings. Each of the drawings in the accompanying drawings is provided for purposes of illustration and description only and is not a definition of the scope of the claims. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] To understand the above features of the present disclosure in detail, a more specific description of the above briefly summarized content can be obtained by referring to various aspects, some of which are shown in the accompanying drawings. It should be noted, however, that the drawings only show some typical aspects of the present disclosure and should not be considered as a limitation of the scope. Thus, the specification may admit other equally effective aspects. The same reference numerals in different drawings may identify the same or similar elements.

[0016] Figure 1 is a diagram illustrating an example of a wireless network according to various aspects of the present disclosure.

[0017] Figure 2 is a diagram illustrating an example of communication between a base station (BS) and a user equipment (UE) in a wireless network according to various aspects of the present disclosure.

[0018] Figure 3 is a diagram illustrating an example of multi-panel uplink transmission according to various aspects of the present disclosure.

[0019] Figure 4 is a diagram illustrating an example of a precoding process according to various aspects of the present disclosure.

[0020] Figures 5 - 8 is a diagram illustrating an example of multi-panel uplink transmission with precoding according to various aspects of the present disclosure.

[0021] Figure 9 is a flowchart illustrating an example process, such as one performed by a UE, according to various aspects of the present disclosure.

[0022] Figure 10 is a flowchart illustrating an example process, such as one performed by a base station, according to various aspects of the present disclosure.

[0023] Figure 11 and Figure 12Block diagram of an example apparatus for wireless communication in accordance with various aspects of the present disclosure. Detailed Description

[0024] Aspects of the present disclosure are described more fully hereinafter with reference to the accompanying drawings. However, the present disclosure may be embodied in many different forms and should not be construed as limited to any specific structure or function presented throughout this disclosure. Rather, these aspects are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the present disclosure to those skilled in the art. Based on the teachings herein, one skilled in the art can appreciate that the scope of the present disclosure is intended to cover any aspect of the disclosure disclosed herein, whether implemented independently or combined with any other aspect of the present disclosure. For example, an apparatus may be implemented or a method may be practiced using any number of the aspects set forth herein. In addition, the scope of the present disclosure is intended to cover such apparatus and methods implemented using other structures, functions, or combinations of structures and functions in addition to or different from the aspects of the disclosure set forth herein. Any aspect of the disclosure disclosed herein may be embodied by one or more elements of a claim.

[0025] Some aspects of a telecommunications system will now be presented with reference to various apparatuses and techniques. These apparatuses and techniques will be described in the following detailed description and illustrated in the accompanying drawings by various blocks, modules, components, circuits, steps, procedures, algorithms, etc., or combinations thereof (collectively referred to as "elements"). These elements may be implemented using hardware, software, or a combination thereof. Whether such elements are implemented as hardware or software depends upon the particular application and design constraints imposed on the overall system.

[0026] Aspects generally relate to multi-panel uplink transmissions with precoding. More specifically, some aspects relate to multi-panel uplink transmissions generated using a precoding process including transform precoding. In some aspects, a user equipment (UE) may receive an indication of precoding information associated with a multi-panel uplink transmission. In some aspects, the precoding information may include: the number of layers associated with the multi-panel uplink transmission, an indication of one or more demodulation reference signals (DMRS) ports associated with the multi-panel uplink transmission, or multiple-input multiple-output (MIMO) precoding information (such as one or more sounding reference signal (SRS) resource indicators (SRI), one or more transmit precoder matrix indicators (TPMI), or one or more uplink transmission configuration indicator (TCI) states), and so on. In some aspects, the UE may generate a multi-panel uplink transmission based on the precoding information (e.g., by performing one or more precoding processes at least partially based on the precoding information). Then, the UE may use multiple antenna panels to transmit the multi-panel uplink transmission.

[0027] Certain aspects of the subject matter described in this disclosure may be implemented to realize one or more of the following potential advantages. In some examples, the techniques described may be used to enable a UE to perform a precoding process associated with a multi-panel uplink transmission (such as a precoding process including transform precoding). The precoding process associated with the multi-panel uplink transmission may enable the UE to utilize the independent peak-to-average power ratio (PAPR) of different antenna panels of the UE 120. This may improve the transmission efficiency associated with the precoding process (e.g., when compared to a precoding process limited to a single layer and a single antenna panel).

[0028] Figure 1 FIG. is a diagram illustrating an example of a wireless network in accordance with various aspects of the present disclosure. The wireless network may be a 5G (NR) network or an LTE network, etc., or may include elements of a 5G (NR) network or an LTE network, etc. The wireless network may include one or more 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, a Node B, a gNB, a 5G Node B (NB), an access point, or a transmit receive point (TRP), etc. Each BS may provide communication coverage for a specific geographic area. In 3GPP, depending on the context in which the term "cell" is used, the term "cell" may refer to the coverage area of a BS or the BS subsystem serving that coverage area.

[0029] The BS can provide communication coverage for macro cells, pico cells, femto cells, or another type of cell. A macro cell can cover a relatively large geographical area (e.g., with a radius of several kilometers), and can allow unrestricted access by UEs with service subscriptions. A pico cell can cover a relatively small geographical area and can allow unrestricted access by UEs with service subscriptions. A femto cell can cover a relatively small geographical area (e.g., a residence), and can allow restricted access by UEs associated with the femto cell (e.g., UEs in a closed subscriber group (CSG)). The BS for a macro cell can be referred to as a macro BS. The BS for a pico cell can be referred to as a pico BS. The BS for a femto cell can be referred to as a femto BS or a home BS. The BS can support one or more (e.g., three) cells.

[0030] The wireless network can be a heterogeneous network including different types of BSs (e.g., macro BSs, pico BSs, femto BSs, relay BSs, etc., or a combination thereof). These different types of BSs can have different transmit power levels, different coverage areas, and different impacts on interference in the wireless network. For example, a macro BS can have a high transmit power level (e.g., 5 to 40 watts), while pico BSs, femto BSs, and relay BSs can have lower transmit power levels (e.g., 0.1 to 2 watts). In Figure 1 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. The network controller 130 can be coupled to the set of BSs 102a, 102b, 110a, and 110b, and can provide coordination and control for these BSs. The network controller 130 can communicate with the BSs via a backhaul. The BSs can also communicate with each other directly or indirectly, e.g., via a wireless backhaul or a wired backhaul.

[0031] In some aspects, the cell may not be stationary. Rather, the geographical area of the cell can move according to the position of a mobile BS. In some aspects, the BSs can use any suitable transmission network to interconnect with each other or with one or more other BSs or network nodes (not shown) in the wireless network via various types of backhaul interfaces (such as direct physical connections, or virtual networks, etc., or a combination thereof).

[0032] The wireless network 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 data to a downstream station (e.g., a UE or a BS). A relay station can also be a UE capable of relaying transmissions for other UEs. In Figure 1In the example shown, relay BS 110d can communicate with macro BS 110a and UE 120d to facilitate communication between BS 110a and UE 120d. The relay BS may also be referred to as a relay station, relay base station, repeater, etc., or a combination thereof.

[0033] UEs 120 (e.g., 120a, 120b, 120c) may be dispersed throughout the wireless network, and each UE may be stationary or mobile. A UE may also be referred to as an access terminal, terminal, mobile station, user unit, station, etc., or a combination thereof. A UE may 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 device, a camera, a gaming device, a netbook, a smartbook, a ultrabook, a medical device or equipment, a biosensor / device, a wearable device (smart watch, smart clothing, smart glasses, smart wristband, smart jewelry (e.g., smart ring, smart bracelet)), an entertainment device (e.g., a music or video device, or a satellite radio unit), a vehicle component or sensor, a smart meter / sensor, an industrial manufacturing device, a global positioning system device, or any other suitable device configured to communicate via a wireless medium.

[0034] Some UEs may be considered machine type communication (MTC) UEs or evolved or enhanced machine type communication (eMTC) UEs. For example, MTC UEs and eMTC UEs include robots, drones, remote devices, sensors, meters, monitors, or location tags, etc., or a combination thereof, that can communicate with a base station, another device (e.g., a remote device), or some other entity. For example, a wireless node may provide a connection to or for 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 may be considered Internet of Things (IoT) devices, or may be implemented as narrowband IoT (NB-IoT) devices. Some UEs may be considered customer premise equipment (CPE). UE 120 may be included in a housing that houses components of UE 120, such as a processor component, a memory component, etc., or a combination thereof.

[0035] Generally, any number of wireless networks may be deployed in a given geographical area. Each wireless network may support a specific radio access technology (RAT) and may operate on one or more frequencies or frequency channels. A frequency may also be referred to as a carrier, etc. Each frequency may support a single RAT in a given geographical area to avoid interference between wireless networks of different RATs. In some cases, an NR or 5G RAT network may be deployed.

[0036] In some aspects, two or more UEs 120 (e.g., shown as UE 120a and UE 120e) may communicate directly with each other using one or more sidelink channels (e.g., without using the base station 110 as an intermediate device). For example, the 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 or vehicle-to-infrastructure (V2I) protocols, etc., or a combination thereof), or a mesh network, etc., or a combination thereof. In such an example, the UE 120 may perform scheduling operations, resource selection operations, or other operations described elsewhere herein as being performed by the base station 110.

[0037] Devices of a wireless network may communicate using the electromagnetic spectrum, which may be subdivided into various categories, bands, or channels based on frequency or wavelength. For example, a device of a wireless network may communicate using an operating band having a first frequency range (FR1), where the span of FR1 may range from 410 MHz to 7.125 GHz. As another example, a device of a wireless network may communicate using an operating band having a second frequency range (FR2), where the span of FR2 may range from 24.25 GHz to 52.6 GHz. The frequencies between FR1 and FR2 are generally referred to as mid-band frequencies. 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), which is identified by the International Telecommunication Union (ITU) as the "millimeter wave" band, FR2 is often referred to as the "millimeter wave" band. Thus, unless otherwise explicitly stated, it should be understood that the term "sub-6 GHz" may broadly represent frequencies less than 6 GHz, frequencies within FR1, mid-band frequencies (e.g., greater than 7.125 GHz), or a combination thereof. Similarly, unless otherwise explicitly stated, it should be understood that the term "millimeter wave" may broadly represent frequencies within the EHF band, frequencies within FR2, mid-band frequencies (e.g., less than 24.25 GHz), or a combination thereof. The frequencies included in FR1 and FR2 may be modified, and the techniques described herein may be applied to these modified frequency ranges.

[0038] Figure 2 is a diagram showing an example of communication between a base station and a UE in a wireless network according to various aspects of the present disclosure. The base station may correspond to Figure 1 the base station 110. Similarly, the UE may correspond to Figure 1 the UE 120.

[0039] Base station 110 may be equipped with T antennas 234a through 234t, and UE 120 may be equipped with R antennas 252a through 252r, where typically T ≥ 1 and R ≥ 1. At base station 110, transmit processor 220 may receive data for one or more UEs from data source 212, select one or more modulation and coding schemes (MCSs) for the UEs at least in part based on channel quality indicators (CQIs) received from each UE, process (e.g., encode) the data for the UEs at least in part based on the MCSs selected for each UE, and provide data symbols for all UEs. Transmit processor 220 may also process system information (e.g., for semi-static resource partitioning information (SRPI), etc.) and control information (e.g., CQI requests, grants, or upper layer signaling, etc., or combinations thereof), and provide overhead symbols and control symbols. Transmit processor 220 may also generate reference symbols for reference signals and synchronization signals. Transmit (TX) multiple-input multiple-output (MIMO) processor 230 may perform spatial processing (e.g., precoding) on the data symbols, control symbols, overhead symbols, or reference symbols (if applicable), and provide T output symbol streams to T modulators (MODs) 232a through 232t. Each MOD 232 may process the corresponding output symbol stream (e.g., for OFDM, etc.) to obtain an output sample stream. Each MOD 232 may 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 MODs 232a through 232t may be transmitted via the T antennas 234a through 234t, respectively.

[0040] At the UE 120, antennas 252a through 252r may receive downlink signals from the base station 110 or other base stations, and may provide the received signals to R demodulators (DEMOD) 254a through 254r, respectively. Each DEMOD 254 may condition (e.g., filter, amplify, down-convert, and digitize) the received signal to obtain input samples. Each DEMOD 254 may further process the input samples (e.g., for OFDM, etc.) to obtain received symbols. The MIMO detector 256 may obtain the received symbols from all R DEMODs 254a through 254r, perform MIMO detection (if applicable) on the received symbols, and provide the detected symbols. The receive processor 258 may process (e.g., decode) the detected symbols, provide the decoded data for the UE 120 to the data sink 260, and provide the decoded control information and system information to the controller / processor 280. The term "controller / processor" may refer to one or more controllers, one or more processors, or a combination thereof. The channel processor may determine the reference signal received power (RSRP), received signal strength indicator (RSSI), reference signal received quality (RSRQ), or channel quality indicator (CQI), etc., or a combination thereof. In some aspects, one or more components of the UE 120 may be included in a housing.

[0041] The network controller 130 may include a communication unit 294, a controller / processor 290, and a memory 292. For example, the network controller 130 may include one or more devices in a core network. The network controller 130 may communicate with the base station 110 via the communication unit 294.

[0042] On the uplink, at the UE 120, the transmit processor 264 may receive and process data from the data source 262 and control information from the controller / processor 280 (e.g., for reports including RSRP, RSSI, RSRQ, or CQI, etc., or combinations thereof). The transmit processor 264 may also generate reference symbols for one or more reference signals. Symbols from the transmit processor 264 may be precoded by the TX MIMO processor 266 (if applicable), further processed by the MODs 254a through 254r (e.g., for discrete Fourier transform spread orthogonal frequency division multiplexing (DFT-s-OFDM), or orthogonal frequency division multiplexing with cyclic prefix (CP) (CP-OFDM), etc., or combinations thereof), and sent to the base station 110. In some aspects, the UE 120 includes a transceiver. The transceiver may include any combination of the antenna 252, modulators 254, demodulators 254, MIMO detector 256, receive processor 258, transmit processor 264, or TX MIMO processor 266. A processor (e.g., the controller / processor 280) and the memory 282 may use the transceiver to perform aspects of any of the methods described herein.

[0043] At the base station 110, uplink signals from the UE 120 and other UEs may be received by the antenna 234, processed by the DEMOD 232, detected by the MIMO detector 236 (if applicable), and further processed by the receive processor 238 to obtain the decoded data and control information transmitted by the UE 120. The receive processor 238 may provide the decoded data to the data sink 239 and the decoded control information to the controller / processor 240. The base station 110 may include a communication unit 244 and may communicate with the network controller 130 via the communication unit 244. The base station 110 may include a scheduler 246 to schedule the UE 120 for downlink and uplink communications. In some aspects, the base station 110 includes a transceiver. The transceiver may include any combination of the antenna 234, modulator 232, demodulator 232, MIMO detector 236, receive processor 238, transmit processor 220, or TX MIMO processor 230. A processor (e.g., the controller / processor 240) and the memory 242 may use the transceiver to perform aspects of any of the methods described herein.

[0044] The controller / processor 240 of the base station 110, the controller / processor 280 of the UE 120, or Figure 2Any other component may perform one or more techniques associated with precoded multi-panel uplink transmission, as described in more detail elsewhere herein. For example, the controller / processor 240 of the base station 110, the controller / processor 280 of the UE 120, or Figure 2 any other component may perform or direct, for example, Figure 9 process 900 of Figure 10 process 1000 of Figure 9 process 900 of Figure 10 process 1000 of

[0045] or other processes described herein. The memories 242 and 282 may store data and program codes for the base station 110 and the UE 120, respectively. In some aspects, the memory 242 or the memory 282 may include a non-transitory computer-readable medium storing one or more instructions (e.g., code or program code) for wireless communication. For example, when executed by one or more processors of the base station 110 or the UE 120 (e.g., directly, or after compilation, conversion, or interpretation), the one or more instructions may cause the one or more processors, the UE 120, or the base station 110 to perform or direct, for example,

[0046] In some aspects, the UE 120 includes: a unit for receiving downlink control information (DCI) indicating precoding information associated with multi-panel uplink transmission, the precoding information including at least one of a DMRS port configuration associated with multi-panel uplink transmission, a MIMO precoding configuration associated with multi-panel uplink transmission, or the number of layers associated with multi-panel uplink transmission. In some aspects, the UE 120 includes: a unit for precoding a multi-panel uplink transmission according to the precoding information for transmission via a first antenna panel of the UE and a second antenna panel of the UE. In some aspects, the UE 120 includes: a unit for transmitting the precoded multi-panel uplink transmission using the first antenna panel and the second antenna panel. The units for the UE 120 to perform the operations described herein may include, for example, the antenna 252, the demodulator 254, the MIMO detector 256, the receive processor 258, the transmit processor 264, the TX MIMO processor 266, the modulator 254, the controller / processor 280, or the memory 282.

[0046] In some aspects, UE 120 includes: a unit for applying a first MIMO precoder indicated by a MIMO precoding configuration to a DMRS port indicated by a DMRS port configuration to generate a multi-panel uplink transmission for a first antenna panel. In some aspects, UE 120 includes: a unit for applying a second MIMO precoder indicated by a MIMO precoding configuration to the DMRS port to generate a multi-panel uplink transmission for a second antenna panel.

[0047] In some aspects, UE 120 includes: a unit for applying a first MIMO precoder to a first DMRS port to generate a multi-panel uplink transmission for a first antenna panel. In some aspects, UE 120 includes: a unit for applying a second MIMO precoder to a second DMRS port to generate a multi-panel uplink transmission for a second antenna panel.

[0048] In some aspects, UE 120 includes: a unit for mapping a multi-panel uplink transmission to a first layer and a second layer. In some aspects, UE 120 includes: a unit for applying a first MIMO precoder to a first DMRS port and a first layer to generate a multi-panel uplink transmission for a first antenna panel. In some aspects, UE 120 includes: a unit for applying a second MIMO precoder to a second DMRS port and a second layer to generate a multi-panel uplink transmission for a second antenna panel.

[0049] In some aspects, UE 120 includes: a unit for applying a first transform precoder to a first layer to generate a multi-panel uplink transmission for a first antenna panel. In some aspects, UE 120 includes: a unit for applying a second transform precoder to a second layer to generate a multi-panel uplink transmission for a second antenna panel.

[0050] In some aspects, base station 110 includes: a unit for determining precoding information for a multi-panel uplink transmission associated with a UE, the precoding information including at least one of a DMRS port configuration associated with the multi-panel uplink transmission, a MIMO precoding configuration associated with the multi-panel uplink transmission, or a number of layers associated with the multi-panel uplink transmission. In some aspects, base station 110 includes: a unit for sending a DCI indicating the precoding information associated with the multi-panel uplink transmission to the UE. The units for base station 110 to perform the operations described herein may include, for example, transmit processor 220, TX MIMO processor 230, modulator 232, antenna 234, demodulator 232, MIMO detector 236, receive processor 238, controller / processor 240, memory 242, or scheduler 246.

[0051] In some aspects, base station 110 includes: a unit for receiving a multi-panel uplink transmission from a UE according to precoding information.

[0052] In some aspects, base station 110 includes: a unit for receiving a multi-panel uplink transmission that is at least one of a single-frequency network (SFN) multi-panel uplink transmission or a frequency-division multiplexing (FDM) multi-panel uplink transmission. In some aspects, base station 110 includes: a unit for determining a first DMRS code-division multiplexing (CDM) group associated with a first DMRS port. In some aspects, base station 110 includes: a unit for determining a second DMRS CDM group associated with a second DMRS port.

[0053] In some aspects, base station 110 includes: a unit for determining a first transform precoder associated with a first layer. In some aspects, base station 110 includes: a unit for determining a second transform precoder associated with a second layer.

[0054] Figure 3 is a diagram illustrating an example of a multi-panel uplink transmission 300 according to various aspects of the present disclosure. As Figure 3 shown, UE 120 may communicate with a first transmit receive point (TRP) 310a and a second TRP 310b. UE 120 may be a multi-panel device equipped with multiple antenna panels, such as a first antenna panel (antenna panel 1) and a second antenna panel (antenna panel 2), as Figure 3 shown.

[0055] In some aspects, an antenna panel may include a plurality of antenna elements (e.g., 16 antenna elements or 32 antenna elements). For the purpose of multi-panel operation, an antenna panel may include antenna elements that can independently control the transmit beam relative to other antenna panels, can independently control the transmit power relative to other antenna panels, or have a common uplink transmission timing, etc.

[0056] As Figure 3As shown, UE 120 may send a multi-panel uplink transmission including a first uplink transmission 315 and a second uplink transmission 320. For example, UE 120 may use the first antenna panel of UE 120 to send the first uplink transmission 315 (e.g., an uplink data transmission or an uplink control transmission) to the first TRP 310a. UE 120 may use the second antenna panel of UE 120 to send the second uplink transmission 320 (e.g., an uplink data transmission or an uplink control transmission) to the second TRP 310b. In some aspects, the first uplink transmission 315 and the second uplink transmission 320 may be associated with the same information (e.g., may carry the same data or the same uplink control information (UCI)). As described above, UE 120 may use a first transmit beam or a first transmit power to send the first uplink transmission 315. UE 120 may use a second transmit beam or a second transmit power to send the second uplink transmission 320. As a result, UE 120 is able to perform transmit diversity, uplink coverage enhancement, MIMO, or increase throughput, etc. using multiple antenna panels.

[0057] In some aspects, the multi-panel uplink transmission may be a space-division multiplexing (SDM) multi-panel uplink or a frequency-division multiplexing (FDM) multi-panel uplink transmission. In an SDM multi-panel uplink transmission, the first uplink transmission 315 and the second uplink transmission 320 may be associated with the same radio resources (e.g., the same time-domain resources and the same frequency-domain resources), but associated with different spatial information. For example, the first uplink transmission 315 may be associated with first spatial information (such as a first transmit beam, a first transmission direction, or a first uplink transmission configuration indicator (TCI) state, etc.), and the second uplink transmission 320 may be associated with second spatial information (such as a second transmit beam, a second transmission direction, or a second uplink TCI state, etc.). In an FDM multi-panel uplink transmission, the first uplink transmission 315 and the second uplink transmission 320 may be associated with the same time-domain resources, but associated with different frequency-domain resources. For example, the first uplink transmission 315 may be associated with a first portion of the frequency-domain resource allocation (FDRA) for the multi-panel uplink transmission (such as the first half of the FDRA), and the second uplink transmission 320 may be associated with a second portion of the FDRA for the multi-panel uplink transmission (such as the second half of the FDRA).

[0058] Figure 4 is a diagram illustrating an example of a precoding process 400 according to various aspects of the present disclosure. The precoding process 400 may be associated with a single-layer uplink transmission. In some aspects, the precoding process 400 may be a transform precoding process.

[0059] As Figure 4 shown in, in a first operation 410, the UE 120 may obtain uplink transmission information to be included in an uplink transmission. The uplink transmission information may include uplink data (e.g., to be transmitted in a Physical Uplink Shared Channel (PUSCH) communication) or uplink control information (e.g., to be transmitted in a Physical Uplink Control Channel (PUCCH) communication). In some aspects, the uplink transmission may be scheduled by the base station 110. In some aspects, the precoding process 400 may be indicated by the base station 110 (e.g., when scheduling an uplink transmission, or in another communication such as Radio Resource Control (RRC) communication).

[0060] In a second operation 420, the UE 120 may perform a transform precoding process associated with the uplink transmission information. The transform precoding process may expand the uplink transmission information (e.g., uplink data). For example, the transform precoding process may be a Discrete Fourier Transform (DFT) process, such as a DFT spread OFDM (DFT-s-OFDM) transform precoding process (or a Single Carrier (SC) OFDM transform precoding process). In some aspects, the DFT size associated with the transform precoding process may be equal to the size of the FDRA associated with the uplink transmission. The transform precoding process may be used by the UE 120 to reduce the Peak-to-Average Power Ratio (PAPR) associated with the uplink transmission. Reducing the PAPR enables the UE 120 to utilize the power amplifier associated with the UE 120, use power more efficiently, or reduce the power consumption of the UE 120, etc.

[0061] In a third operation 430, the UE 120 may determine the Demodulation Reference Signal (DMRS) ports associated with the uplink transmission. The DMRS ports may be used to transmit the DMRS associated with the uplink transmission. The DMRS may carry information for estimating the radio channel for demodulation of the associated physical channel (e.g., PUCCH or PUSCH). The design and mapping of the DMRS may be specific to the physical channel for which the DMRS is used for estimation. The DMRS is UE-specific, may be beamformed, may be restricted to the scheduled resources (e.g., rather than transmitted over a wideband), and may be transmitted only when necessary. The UE 120 may determine the DMRS ports associated with (e.g., allocated for) the uplink transmission.

[0062] In a fourth operation 440, the UE 120 may perform one or more MIMO precoding procedures. The MIMO precoding procedures may be codebook-based (e.g., where the UE 120 determines a precoding matrix at least in part based on an indication from the base station 110) or non-codebook-based (e.g., where the UE 120 determines a precoding matrix at least in part based on one or more downlink channel measurements). For example, the UE 120 may determine a transmit precoder matrix indicator (TPMI) associated with an uplink transmission. The TPMI may indicate a precoder associated with the uplink transmission.

[0063] In some aspects, the MIMO precoding procedure may include: determining a sounding reference signal (SRS) resource indicator (SRI) associated with an uplink transmission. The SRI may be used to identify one or more resources for the SRS associated with the uplink transmission. For example, the SRS may carry information for uplink channel estimation, which may be used for scheduling, link adaptation, precoder selection, beam management, etc. The base station 110 may configure one or more SRS resource sets for the UE 120, and the UE 120 may transmit the SRS on the configured SRS resource sets. The SRS resource sets may have a configured purpose, such as uplink channel state information (CSI) acquisition, downlink CSI acquisition for reciprocal-based operations, or uplink beam management, etc. The base station 110 may measure the SRS, may perform channel estimation at least in part based on the measurement, and may use the SRS measurement to configure communication with the UE 120. The UE 120 may determine the SRS resource set associated with the uplink transmission at least in part based on the SRI.

[0064] In some aspects, the MIMO precoding procedure may include: determining an uplink TCI state, spatial relation information, or a spatial transmit filter associated with an uplink transmission. The TCI state may indicate the directivity or characteristics of an uplink beam, e.g., one or more quasi-co-location (QCL) attributes of the uplink beam. The QCL attributes may include, for example, Doppler frequency shift, Doppler spread, average delay, delay spread, or spatial transmit / receive parameters, etc. The UE 120 may determine the uplink beam associated with the uplink transmission at least in part based on the uplink TCI state.

[0065] In a fifth operation 450, the UE 120 may transmit an uplink transmission based at least in part on performing one or more of the first through fourth operations described above. In some aspects, the UE 120 may use a single antenna panel to transmit the uplink transmission. For example, the uplink transmission generated using the precoding process 400 may be a single-layer, single-antenna-panel uplink transmission. In some aspects, in addition to or instead of one or more of the first through fourth operations described above, the UE 120 may perform one or more other actions (such as scrambling, modulation, resource block (RB) mapping, or layer mapping, etc.).

[0066] In some aspects, a precoding process that includes transform precoding (e.g., precoding process 400) may be applied to a single-layer uplink transmission (e.g., an uplink communication transmitted using a single antenna panel of the UE 120) because the PAPR may be associated with a single antenna panel. As described above, a precoding process that includes transform precoding may be designed to meet the PAPR requirements of the antenna panel. To meet the PAPR requirements of the antenna panel of the UE 120, the precoding process may be limited to single-layer and single-antenna-panel uplink transmissions.

[0067] However, in some cases, the UE 120 may support multi-panel operation (e.g., the UE 120 is capable of transmitting using multiple antenna panels, as described in connection with Figure 3 ). The PAPR of the UE 120 that supports multi-panel operation may be determined on a per-antenna-panel basis (e.g., each antenna panel may be associated with a PAPR value or requirement). Thus, a precoding process that includes transform precoding only for a single layer and a single antenna panel may not be applicable to the multi-panel uplink transmission of the UE 120.

[0068] Aspects generally relate to multi-panel uplink transmissions with precoding. More specifically, some aspects relate to multi-panel uplink transmissions generated using a precoding process that includes transform precoding. In some aspects, the UE 120 may receive an indication of precoding information associated with the multi-panel uplink transmission. In some aspects, the precoding information may include the number of layers associated with the multi-panel uplink transmission, an indication of one or more DMRS ports associated with the multi-panel uplink transmission, or MIMO precoding information (such as one or more SRIs, one or more TPMIs, or one or more uplink TCI states), etc. In some aspects, the UE 120 may generate a multi-panel uplink transmission based on the precoding information (e.g., by performing one or more precoding processes based at least in part on the precoding information). The UE 120 may then use multiple antenna panels to transmit the multi-panel uplink transmission.

[0069] Certain aspects of the subject matter described in this disclosure can be implemented to realize one or more of the following potential advantages. In some examples, the techniques described can be used to enable the UE 120 to perform a precoding process associated with a multi-panel uplink transmission (e.g., a precoding process including transform precoding). The precoding process associated with the multi-panel uplink transmission can enable the UE 120 to utilize the independent PAPR of different antenna panels of the UE 120. This can improve the transmission efficiency associated with the precoding process (e.g., when compared to a precoding process limited to a single layer and a single antenna panel).

[0070] Figure 5 FIG. is a diagram illustrating an example of a multi-panel uplink transmission 500 with precoding in accordance with various aspects of the present disclosure. As Figure 5 shown, the UE 120 can perform one or more operations to generate a multi-panel uplink transmission. In some aspects, the one or more operations can be indicated to the UE 120 by the base station 110 (e.g., in a downlink control information (DCI) communication). For example, as described herein, the base station 110 can determine precoding information associated with the multi-panel uplink transmission. The base station 110 can indicate the precoding information to the UE 120 in a DCI communication (e.g., a DCI communication scheduling the multi-panel uplink communication or another DCI communication). In some aspects, the multi-panel uplink communication can include an uplink data communication (e.g., a PUSCH communication) or an uplink control communication (e.g., a PUCCH communication).

[0071] In some aspects, the multi-panel uplink communication can be a single-layer uplink communication or a multi-layer (e.g., two-layer) uplink communication. In some aspects, the multi-panel uplink communication can be an FDM communication or a single-frequency network (SFN) communication. For example, in some cases, the UE 120 can operate in an SFN. An SFN can be a network configuration in which multiple cells (e.g., multiple base stations 110 or multiple cells associated with a single base station 110) simultaneously transmit the same signal on the same frequency channel. Similarly, the UE 120 in an SFN can simultaneously transmit the same signal on the same frequency channel. For example, an SFN can be a broadcast network. An SFN can achieve an extended coverage area without using additional frequencies. For example, the SFN configuration can include UE 120s in the SFN area that transmit one or more identical signals on the same frequency at the same or substantially the same time (e.g., in an SFN multi-panel uplink transmission).

[0072] In a first operation 510, the UE 120 may receive scheduling information for a multi-panel uplink transmission for transmitting uplink transmission information (e.g., data or control information). The scheduling information may be indicated by the base station 110 to the UE 120 in DCI communication. In some aspects, the DCI communication (or another downlink communication from the base station 110) may indicate precoding information associated with the multi-panel uplink transmission. For example, the base station 110 may indicate that the multi-panel uplink transmission is a single-layer multi-panel uplink transmission. The base station 110 may indicate the DMRS port configuration associated with the multi-panel uplink transmission (e.g., indicate the DMRS ports). The base station 110 may indicate the MIMO precoding configuration associated with the multi-panel uplink transmission (e.g., indicate one or more MIMO precoders, such as SRI, TPMI, or uplink TCI state, etc.).

[0073] In a second operation 520, the UE 120 may perform a transform precoding process indicated by the precoding information. In some aspects, the second operation 520 and the transform precoding process may be optional and not performed for some multi-panel uplink transmissions. The transform precoding process may include applying a DFT to the uplink transmission information. In some aspects, when the multi-panel uplink transmission is an FDM transmission, the size of the transform precoder (e.g., the size of the DFT) may be at least partially based on the size of the FDRA associated with the multi-panel uplink transmission. For example, for an FDM multi-panel uplink transmission, the DFT size associated with the transform precoding process may be reduced to a portion of the FDRA (e.g., half of the FDRA). In some aspects, when the multi-panel uplink transmission is an SFN transmission, the size of the transform precoder (e.g., the size of the DFT) may be equal to the size of the FDRA. In some aspects, the transform precoding process may be applied to a single layer (e.g., because the multi-panel uplink transmission may be a single-layer multi-panel uplink transmission).

[0074] In a third operation 530, the UE 120 may determine (or identify) the DMRS ports at least partially based on the DMRS port configuration indicated by the base station 110. For example, the precoding information indicated by the base station 110 may indicate that the multi-panel uplink transmission is associated with a single DMRS port. The UE 120 may map the single layer associated with the multi-panel uplink transmission to the DMRS port. That is, the multi-panel uplink transmission may be associated with a single DMRS. In some aspects, the DMRS ports associated with the multi-panel uplink transmission may not be explicitly indicated. For example, a default DMRS port (e.g., DMRS port index 0) may be associated with the multi-panel uplink transmission.

[0075] In a fourth operation 540, the UE 120 may determine (or identify) a first MIMO precoder associated with a multi-panel uplink transmission, at least in part, based on a MIMO precoding configuration indicated by the base station 110. The first MIMO precoder may indicate a first beam associated with the multi-panel uplink transmission (e.g., a first uplink TCI state, a first spatial relation information, or a first spatial transmit filter). The first MIMO precoder may indicate a first SRI (e.g., when the multi-panel uplink transmission is a non-codebook-based uplink transmission) or a first TPMI (e.g., when the multi-panel uplink transmission is a codebook-based uplink transmission), which indicate a digital MIMO transmit precoder associated with the multi-panel uplink transmission. In some aspects, the first MIMO precoder may be associated with a first antenna panel of the UE 120. The UE 120 may apply the first MIMO precoder to a single layer and DMRS ports associated with the multi-panel uplink transmission.

[0076] In a fifth operation 550, the UE 120 may determine (or identify) a second MIMO precoder associated with a multi-panel uplink transmission, at least in part, based on a MIMO precoding configuration indicated by the base station 110. The second MIMO precoder may indicate a second beam associated with the multi-panel uplink transmission (e.g., a second uplink TCI state, a second spatial relation information, or a second spatial transmit filter). The second MIMO precoder may indicate a second SRI (e.g., when the multi-panel uplink transmission is a non-codebook-based uplink transmission) or a second TPMI (e.g., when the multi-panel uplink transmission is a codebook-based downlink transmission), which indicate a digital MIMO transmit precoder associated with the multi-panel uplink transmission. In some aspects, the second MIMO precoder may be associated with a second antenna panel of the UE 120. The UE 120 may apply the second MIMO precoder to a single layer and DMRS ports associated with the multi-panel uplink transmission. That is, the UE 120 may apply the second MIMO precoder to the same layer and the same DMRS ports to which the first MIMO precoder is applied (e.g., as described above in connection with the fourth operation 540).

[0077] In this manner, the UE 120 can generate a first signal associated with multi-panel uplink transmission for the first antenna panel of the UE 120 (e.g., a first signal using a first beam, a first SRS resource set, or a first TPMI) and a second signal associated with multi-panel uplink transmission for the second antenna panel of the UE 120 (e.g., a second signal using a second beam, a second SRS resource set, or a second TPMI). The first signal and the second signal can be associated with a single layer and the same DMRS port of the PUSCH or PUCCH.

[0078] In a sixth operation 560, the UE 120 can use the first antenna panel to send a first signal associated with multi-panel uplink transmission to a first TRP. In a seventh operation 570, the UE 120 can use the second antenna panel to send a second signal associated with multi-panel uplink transmission to a second TRP. As described above, the multi-panel uplink transmission can be an FDM transmission (e.g., where the first signal and the second signal are associated with the same time domain resources but different frequency domain resources) or an SFN transmission (e.g., where the first signal and the second signal are associated with the same time domain resources and the same frequency domain resources). In some aspects, the UE 120 can perform one or more additional operations to generate the first signal and the second signal associated with multi-panel uplink transmission, in combination with or instead of one or more of the first through seventh operations described above, such as scrambling operations, modulation operations, layer mapping operations, or coding operations.

[0079] Figure 6 FIG. is a diagram illustrating an example of a multi-panel uplink transmission 600 with precoding in accordance with various aspects of the present disclosure. As Figure 6 shown, the UE 120 can perform one or more operations to generate a multi-panel uplink transmission. In some aspects, the one or more operations can be indicated by the base station 110 to the UE 120 (e.g., in DCI communication). For example, as described herein, the base station 110 can determine precoding information associated with the multi-panel uplink transmission. The base station 110 can indicate the precoding information to the UE 120 in DCI communication (e.g., DCI communication scheduling multi-panel uplink communication or another DCI communication).

[0080] In some aspects, multi-panel uplink communication may include uplink data communication (e.g., PUSCH communication) or uplink control communication (e.g., PUCCH communication). In some aspects, a multi-panel uplink transmission 600 with precoding may be associated with a single-layer multi-panel uplink transmission. In some aspects, a multi-panel uplink transmission 600 with precoding may be an SFN multi-panel uplink transmission.

[0081] In a first operation 610, the UE 120 may receive scheduling information for a multi-panel uplink transmission for transmitting uplink transmission information (e.g., data or control information). The scheduling information may be indicated by the base station 110 to the UE 120 in DCI communication. In some aspects, the DCI communication (or another downlink communication from the base station 110) may indicate precoding information associated with the multi-panel uplink transmission. For example, the base station 110 may indicate that the multi-panel uplink transmission is a single-layer multi-panel uplink transmission. The base station 110 may indicate the DMRS port configuration associated with the multi-panel uplink transmission (e.g., indicating one or more DMRS ports). The base station 110 may indicate the MIMO precoding configuration associated with the multi-panel uplink transmission (e.g., indicating one or more MIMO precoders, such as one or more SRIs, one or more TPMIs, or one or more uplink TCI states, etc.).

[0082] In a second operation 620, the UE 120 may perform a transform precoding process indicated by the precoding information. In some aspects, the second operation 620 and the transform precoding process may be optional and not performed for some multi-panel uplink transmissions. The transform precoding process may include: applying a DFT to the uplink transmission information. In some aspects, the size of the transform precoder (e.g., the size of the DFT) may be equal to the size of the FDRA (e.g., because the multi-panel uplink transmission 600 with precoding may be an SFN transmission). In some aspects, the transform precoding process may be applied to a single layer (e.g., because the multi-panel uplink transmission 600 with precoding may be a single-layer multi-panel uplink transmission).

[0083] In a third operation 630, the UE 120 may determine (or identify) a first DMRS port based at least in part on a DMRS port configuration indicated by the base station 110. For example, precoding information indicated by the base station 110 may indicate that a multi-panel uplink transmission is associated with multiple DMRS ports (e.g., two DMRS ports). In some aspects, the DMRS ports may not be explicitly indicated. For example, multiple default DMRS ports may be associated with a multi-panel uplink transmission (e.g., a DMRS port associated with index 0 and a DMCS port associated with index 2). The UE 120 may map a single layer associated with the multi-panel uplink transmission to the first DMRS port. The first DMRS port may be associated with generating a signal associated with the multi-panel uplink transmission for a first antenna panel of the UE 120.

[0084] In some aspects, the DMRS port configuration may indicate a first phase-tracking reference signal (PTRS) associated with the first DMRS port. The PTRS may carry information for compensating oscillator phase noise. Generally, phase noise increases as the oscillator carrier frequency increases. Thus, the PTRS may be used at high carrier frequencies (e.g., millimeter-wave frequencies) to mitigate phase noise. The PTRS may be used to track the phase of a local oscillator and achieve suppression of phase noise and common phase error (CPE). The UE 120 may determine (or identify) a first PTRS associated with the first DMRS port.

[0085] In a fourth operation 640, the UE 120 may determine (or identify) a second DMRS port based at least in part on a DMRS port configuration indicated by the base station 110. The UE 120 may map a single layer associated with the multi-panel uplink transmission to the second DMRS port. The second DMRS port may be associated with generating a signal associated with the multi-panel uplink transmission for a second antenna panel of the UE 120. In some aspects, the UE 120 may determine (or identify) a second PTRS associated with the second DMRS port.

[0086] In some aspects, the DMRS port configuration may indicate one or more DMRS code-division multiplexing (CDM) groups associated with the first DMRS port and the second DMRS port. For example, the DMRS port configuration may indicate that the first DMRS port and the second DMRS port are associated with the same DMRS CDM group. In some aspects, the DMRS port configuration may indicate a first DMRS CDM group associated with the first DMRS port and a second DMRS CDM group associated with the second DMRS port. The UE 120 may determine (or identify) a DMRS CDM group associated with the first DMS port or the second DMS port.

[0087] In a fifth operation 650, the UE 120 may determine (or identify) a first MIMO precoder associated with a multi-panel uplink transmission, at least in part based on a MIMO precoding configuration indicated by the base station 110. The first MIMO precoder may indicate a first beam associated with the multi-panel uplink transmission (e.g., a first uplink TCI state, a first spatial relation information, or a first spatial transmit filter). The first MIMO precoder may indicate a first SRI (e.g., when the multi-panel uplink transmission is a non-codebook-based uplink transmission) or a first TPMI (e.g., when the multi-panel uplink transmission is a codebook-based uplink transmission), which indicate a digital MIMO transmit precoder associated with the multi-panel uplink transmission. In some aspects, the first MIMO precoder may be associated with a first antenna panel of the UE 120. The UE 120 may apply the first MIMO precoder to a single layer and DMRS ports associated with the multi-panel uplink transmission.

[0088] In a sixth operation 660, the UE 120 may determine (or identify) a second MIMO precoder associated with a multi-panel uplink transmission, at least in part based on a MIMO precoding configuration indicated by the base station 110. The second MIMO precoder may indicate a second beam associated with the multi-panel uplink transmission (e.g., a second uplink TCI state or a second spatial relation information). The second MIMO precoder may indicate a second SRI or a second TPMI associated with the multi-panel uplink transmission. In some aspects, the second MIMO precoder may be associated with a second antenna panel of the UE 120. The UE 120 may apply the second MIMO precoder to a single layer and second DMRS ports associated with the multi-panel uplink transmission.

[0089] In some aspects, the first MIMO precoder and the second MIMO precoder may be the same or partially the same. For example, the first MIMO precoder and the second MIMO precoder may indicate the same SRI or the same TPMI (or for example, the MIMO precoding configuration may indicate only a single SRI or a single TPMI). For example, if the first MIMO precoder and the second MIMO precoder indicate the same SRI, the UE 120 may apply the SRI to the first DMRS port (e.g., in conjunction with the fifth operation 650), and the UE 120 may apply the SRI to the second DMRS port (e.g., in conjunction with the sixth operation 660).

[0090] In this manner, the UE 120 can generate a first signal associated with multi-panel uplink transmission for the first antenna panel of the UE 120 (e.g., a first signal using the first DMRS port, the first beam, the first SRS resource set, or the first TPMI) and a second signal associated with multi-panel uplink transmission for the second antenna panel of the UE 120 (e.g., a second signal using the second DMRS port, the second beam, the second SRS resource set, or the second TPMI). The first signal and the second signal can be associated with a single layer and different DMRS ports. By generating the first signal and the second signal using separate DMRS ports, the UE 120 can improve channel estimation associated with multi-panel uplink transmission. For example, since each signal can be associated with DMRS, channel estimation can be performed independently for the first signal transmitted using the first antenna panel and the second signal transmitted using the second antenna panel (e.g., using the DMRS associated with each signal). In this way, channel estimation associated with multi-panel uplink transmission can be improved.

[0091] In a seventh operation 670, the UE 120 can use the first antenna panel to send a first signal associated with multi-panel uplink transmission to a first TRP. In an eighth operation 680, the UE 120 can use the second antenna panel to send a second signal associated with multi-panel uplink transmission to a second TRP. As described above, the multi-panel uplink transmission can be an SFN transmission using a single transmission port (e.g., a single layer) but using two DMRS ports (e.g., where the first signal and the second signal are associated with the same time-domain resources and the same frequency-domain resources).

[0092] In some aspects, the UE 120 can perform one or more additional operations to generate the first signal and the second signal associated with multi-panel uplink transmission, such as scrambling operations, modulation operations, layer mapping operations, or coding operations, in combination with or instead of one or more of the first through eighth operations described above.

[0093] Figure 7 FIG. is a diagram illustrating an example of a multi-panel uplink transmission 700 with precoding according to various aspects of the present disclosure. As Figure 7As shown, UE 120 may perform one or more operations to generate a multi-panel uplink transmission. In some aspects, one or more operations may be indicated by base station 110 to UE 120 (e.g., in DCI communication). For example, as described herein, base station 110 may determine precoding information associated with a multi-panel uplink transmission. Base station 110 may indicate the precoding information to UE 120 in DCI communication (e.g., DCI communication scheduling multi-panel uplink communication or another DCI communication).

[0094] In some aspects, the multi-panel uplink communication may include uplink data communication (e.g., PUSCH communication) or uplink control communication (e.g., PUCCH communication). In some aspects, the multi-panel uplink transmission 700 with precoding may be associated with a multi-layer multi-panel uplink transmission (e.g., multi-layer PUSCH communication or multi-layer PUCCH communication).

[0095] In a first operation 705, UE 120 may receive scheduling information for a multi-panel uplink transmission for transmitting uplink transmission information (e.g., data or control information). The scheduling information may be indicated by base station 110 to UE 120 in DCI communication. In some aspects, the DCI communication (or another downlink communication from base station 110) may indicate precoding information associated with the multi-panel uplink transmission. For example, base station 110 may indicate that the multi-panel uplink transmission is a multi-layer multi-panel uplink transmission (e.g., base station 110 may indicate the number of layers associated with the multi-panel uplink transmission). Base station 110 may indicate the DMRS port configuration associated with the multi-panel uplink transmission (e.g., indicating one or more DMRS ports). Base station 110 may indicate the MIMO precoding configuration associated with the multi-panel uplink transmission (e.g., indicating one or more MIMO precoders, such as one or more SRIs, one or more TPMIs, or one or more uplink TCI states, etc.).

[0096] In a second operation 710, UE 120 may perform a layer mapping process to map the uplink transmission information to a first layer and a second layer. In some aspects, UE 120 may map the uplink transmission information to more than two layers (e.g., three layers or four layers). Thus, although the examples and operations described herein are described with respect to two layers, these examples and operations may be similarly applied to scenarios where the multi-panel uplink transmission includes more than two layers.

[0097] In a third operation 715, the UE 120 may perform a first transform precoding process indicated by precoding information. In some aspects, the third operation 715 and the first transform precoding process may be optional and not performed for some multi-panel uplink transmissions. The first transform precoding process may include applying a first DFT to uplink transmission information mapped to a first layer of a multi-panel uplink transmission.

[0098] In a fourth operation 720, the UE 120 may perform a second transform precoding process indicated by precoding information. In some aspects, the fourth operation 720 and the second transform precoding process may be optional and not performed for some multi-panel uplink transmissions. The second transform precoding process may include applying a second DFT to uplink transmission information mapped to a second layer of a multi-panel uplink transmission.

[0099] In some aspects, the first transform precoding process and the second transform precoding process may be the same transform precoding process (e.g., the UE 120 may perform a transform precoding process associated with a first layer and may perform the same transform precoding process associated with a second layer). For example, the UE 120 may apply a DFT to uplink transmission information mapped to a first layer of a multi-panel uplink transmission. The UE 120 may apply the same DFT to uplink transmission information mapped to a second layer of a multi-panel uplink transmission. In some aspects, the first transform precoding process and the second transform precoding process may be different transform precoding processes. For example, the UE 120 may apply a first DFT to uplink transmission information mapped to a first layer of a multi-panel uplink transmission. The UE 120 may apply a second DFT to uplink transmission information mapped to a second layer of a multi-panel uplink transmission.

[0100] In a fifth operation 725, the UE 120 may determine (or identify) a first DMRS port at least partially based on a DMRS port configuration indicated by the base station 110. For example, precoding information indicated by the base station 110 may indicate that a multi-panel uplink transmission is associated with multiple DMRS ports (e.g., two DMRS ports). In some aspects, the DMRS ports may not be explicitly indicated. For example, multiple default DMRS ports may be associated with a multi-panel uplink transmission (e.g., a DMRS port associated with index 0 and a DMCS port associated with index 2). The UE 120 may map a first layer associated with the multi-panel uplink transmission to the first DMRS port. The first DMRS port may be associated with generating a signal associated with the multi-panel uplink transmission for a first antenna panel of the UE 120. In some aspects, the DMRS port configuration may indicate a first PTRS associated with the first DMRS port.

[0101] In a sixth operation 730, the UE 120 may determine (or identify) a second DMRS port based at least in part on a DMRS port configuration indicated by the base station 110. The UE 120 may map a second layer associated with a multi-panel uplink transmission to the second DMRS port. The second DMRS port may be associated with generating a signal associated with the multi-panel uplink transmission for a second antenna panel of the UE 120. In some aspects, the UE 120 may determine (or identify) a second PTRS associated with the second DMRS port.

[0102] In some aspects, the DMRS port configuration may indicate one or more DMRS CDM groups associated with the first DMRS port and the second DMRS port. For example, the DMRS port configuration may indicate that the first DMRS port and the second DMRS port are associated with the same DMRS CDM group. In some aspects, the DMRS port configuration may indicate a first DMRS CDM group associated with the first DMRS port and a second DMRS CDM group associated with the second DMRS port. The UE 120 may determine (or identify) a DMRS CDM group associated with the first DMS port or the second DMS port.

[0103] In a seventh operation 735, the UE 120 may determine (or identify) a first MIMO precoder associated with a multi-panel uplink transmission based at least in part on a MIMO precoding configuration indicated by the base station 110. The first MIMO precoder may indicate a first beam associated with the multi-panel uplink transmission (e.g., a first uplink TCI state, first spatial relation information, or first spatial transmit filter). The first MIMO precoder may indicate a first SRI (e.g., when the multi-panel uplink transmission is a non-codebook-based uplink transmission) or a first TPMI (e.g., when the multi-panel uplink transmission is a codebook-based uplink transmission), which indicate a digital MIMO transmit precoder associated with the multi-panel uplink transmission. In some aspects, the first MIMO precoder may be associated with a first antenna panel of the UE 120. The UE 120 may apply the first MIMO precoder to a first layer and a first DMRS port associated with the multi-panel uplink transmission.

[0104] In an eighth operation 740, the UE 120 may determine (or identify) a second MIMO precoder associated with a multi-panel uplink transmission, at least in part, based on a MIMO precoding configuration indicated by the base station 110. The second MIMO precoder may indicate a second beam associated with the multi-panel uplink transmission (e.g., a second uplink TCI state, second spatial relation information, or second spatial transmit filter). The second MIMO precoder may indicate a second SRI or a second TPMI associated with the multi-panel uplink transmission. In some aspects, the second MIMO precoder may be associated with a second antenna panel of the UE 120. The UE 120 may apply the second MIMO precoder to a second layer and second DMRS ports associated with the multi-panel uplink transmission.

[0105] In some aspects, the first MIMO precoder and the second MIMO precoder may be the same or partially the same. For example, the first MIMO precoder and the second MIMO precoder may indicate the same SRI or the same TPMI (or, for example, the MIMO precoding configuration may indicate only a single SRI or a single TPMI). For example, if the first MIMO precoder and the second MIMO precoder indicate the same SRI, the UE 120 may apply the SRI to the first layer and first DMRS ports (e.g., in conjunction with the seventh operation 735), and the UE 120 may apply the SRI to the second layer and second DMRS ports (e.g., in conjunction with the eighth operation 740).

[0106] In this way, the UE 120 may generate a first signal associated with the multi-panel uplink transmission for a first antenna panel of the UE 120 (e.g., a first signal using the first layer, first DMRS ports, first beam, first SRS resource set, or first TPMI) and a second signal associated with the multi-panel uplink transmission for a second antenna panel of the UE 120 (e.g., a second signal using the second layer, second DMRS ports, second beam, second SRS resource set, or second TPMI). By generating the first signal and the second signal using separate layers, the capacity of the multi-panel uplink transmission may be improved. For example, by generating a first signal associated with the first layer of the multi-panel uplink transmission and a second signal associated with the second layer of the multi-panel uplink transmission, the UE 120 may transmit a greater amount of information in the multi-panel uplink transmission.

[0107] In the ninth operation 745, the UE 120 may use the first antenna panel to send a first signal associated with a multi-panel uplink transmission to the first TRP. In the tenth operation 750, the UE 120 may use the second antenna panel to send a second signal associated with a multi-panel uplink transmission to the second TRP. As described above, the multi-panel uplink transmission may be an SFN transmission using a single transmission port (e.g., single layer) but using two DMRS ports (e.g., where the first signal and the second signal are associated with the same time domain resources and the same frequency domain resources).

[0108] In some aspects, the UE 120 may perform one or more additional operations to generate the first signal and the second signal associated with the multi-panel uplink transmission in combination with or instead of one or more of the first operation to the eighth operation described above, such as scrambling operations, modulation operations, layer mapping operations, or coding operations, etc.

[0109] Figure 8 FIG. is a diagram illustrating an example associated with a multi-panel uplink transmission 800 with precoding according to various aspects of the present disclosure. As Figure 8 shown, the UE 120 may communicate with multiple TRPs (e.g., the first TRP 805 and the second TRP 810). In some aspects, the first TRP 805 may be associated with the first base station 110, and the second TRP 810 may be associated with the second base station 110. In some aspects, the first TRP 805 and the second TRP 810 may be associated with the same base station 110.

[0110] In the first operation 815, the first TRP 805 (e.g., the first base station 110) may determine precoding information associated with a multi-panel uplink transmission to be sent by the UE 120. The precoding information may include a DMRS port configuration associated with the multi-panel uplink transmission, a MIMO precoding configuration associated with the multi-panel uplink transmission, the number of layers associated with the multi-panel uplink transmission, or a transform precoding configuration associated with the multi-panel uplink transmission, etc. The precoding information may be the same as or similar to the precoding information described above in connection with Figure 5 、 6 or Figure 7 described.

[0111] In some aspects, the second TRP 810 (e.g., the second base station 110) may determine precoding information associated with a multi-panel uplink transmission to be sent by the UE 120. In some aspects, a third TRP (e.g., Figure 8A third base station 110 (not shown in the figure) may determine precoding information associated with a multi-panel uplink transmission to be sent by the UE 120.

[0112] In a second operation 820, the first TRP 805 (or the TRP that determines the precoding information) may send an indication of the precoding information associated with the multi-panel uplink transmission to the UE 120. In some aspects, the first TRP 805 may send an indication of the precoding information in DCI communication. In some aspects, the DCI communication may include DCI that schedules the multi-panel uplink transmission. In some aspects, the DCI communication may be a DCI separate from the DCI communication that schedules the multi-panel uplink transmission. In some aspects, the first TRP 805 may send an indication of the precoding information (or a part of the precoding information) associated with the multi-panel uplink transmission to the UE 120 in a configuration such as an RRC configuration. In such an example, the UE 120 may apply the precoding information (or a part of the precoding information) to multiple (or all) multi-panel uplink communications sent by the UE 120. In some aspects, the first TRP 805 may send an indication of the precoding information to the second TRP 810.

[0113] In a third operation 825, the UE 120 may generate a multi-panel uplink transmission according to the precoding information. The UE 120 may at least partially precode the multi-panel uplink transmission based on the precoding information for transmission via the first antenna panel of the UE 120 and the second antenna panel of the UE 120. For example, the UE 120 may precode the multi-panel uplink transmission as described above in connection with Figure 5 , Figure 6 or Figure 7 . The UE 120 may generate a first signal (e.g., a first layer, a first DMRS port, a first SRI, a first TPMI, or a first uplink TCI state) of the multi-panel uplink transmission associated with the first antenna panel of the UE 120. The UE 120 may generate a second signal (e.g., a second layer, a second DMRS port, a second SRI, a second TPMI, or a second uplink TCI state) of the multi-panel uplink transmission associated with the second antenna panel of the UE 120.

[0114] In a fourth operation 830, the UE 120 may transmit a precoded multi-panel uplink transmission to the first TRP 805 and the second TRP 810. For example, the UE 120 may use a first antenna panel of the UE 120 to transmit a first signal associated with the multi-panel uplink transmission to the first TRP 805. The UE 120 may use a second antenna panel of the UE 120 to transmit a second signal associated with the multi-panel uplink transmission to the second TRP 810. In some aspects, the multi-panel uplink transmission may be an FDM transmission or an SFN transmission, etc.

[0115] As a result, the UE 120 may be able to perform a precoding process associated with the multi-panel uplink transmission (e.g., a precoding process including transform precoding). The precoding process associated with the multi-panel uplink transmission may enable the UE 120 to utilize the independent PAPR of different antenna panels of the UE 120. This may improve the transmission efficiency associated with the precoding process associated with the multi-panel uplink transmission (e.g., when compared to a precoding process limited to a single layer and a single antenna panel).

[0116] Figure 9 is a flowchart illustrating an example process 900, such as performed by a UE, in accordance with various aspects of the present disclosure. The example process 900 is an example of operations performed by a UE (e.g., UE 120) associated with a precoded multi-panel uplink transmission.

[0117] As Figure 9 shown, in some aspects, process 900 may include: receiving DCI indicating precoding information associated with the multi-panel uplink transmission, the precoding information including at least one of a DMRS port configuration associated with the multi-panel uplink transmission, a MIMO precoding configuration associated with the multi-panel uplink transmission, or a number of layers associated with the multi-panel uplink transmission (block 910). For example, the UE may (e.g., by using Figure 11 the receiving component 1102 depicted therein) receive DCI indicating precoding information associated with the multi-panel uplink transmission, the precoding information including at least one of a DMRS port configuration associated with the multi-panel uplink transmission, a MIMO precoding configuration associated with the multi-panel uplink transmission, or a number of layers associated with the multi-panel uplink transmission, as described above.

[0118] As Figure 9 further shown, in some aspects, process 900 may include: precoding the multi-panel uplink transmission at least in part based on the precoding information for transmission via a first antenna panel of the UE and a second antenna panel of the UE (block 920). For example, the UE may (e.g., by using Figure 11The signal generation component 1110 depicted in [description] precodes the multi-panel uplink transmission at least in part based on precoding information for transmission via the first antenna panel of the UE and the second antenna panel of the UE, as described above.

[0119] As Figure 9 Further shown in [description], in some aspects, process 900 may include: using the first antenna panel and the second antenna panel to transmit the precoded multi-panel uplink transmission (block 930). For example, the UE may (e.g., by using Figure 11 the transmission component 1106 depicted in [description]) use the first antenna panel and the second antenna panel to transmit the precoded multi-panel uplink transmission, as described above.

[0120] Process 900 may include additional aspects, such as any single aspect or any combination of aspects described below or in combination with one or more other processes described elsewhere herein.

[0121] In a first additional aspect, the precoding information includes a transform precoding configuration associated with the multi-panel uplink transmission.

[0122] In a second additional aspect, either alone or in combination with the first aspect, the MIMO precoding configuration indicates a first MIMO precoder associated with the first antenna panel and a second MIMO precoder associated with the second antenna panel.

[0123] In a third additional aspect, either alone or in combination with one or more of the first and second aspects, the DMRS port configuration indicates the DMRS ports associated with the multi-panel uplink transmission.

[0124] In a fourth additional aspect, either alone or in combination with one or more of the first to third aspects, the MIMO precoding configuration indicates a first MIMO precoder associated with the first antenna panel and the DMRS ports and a second MIMO precoder associated with the second antenna panel and the DMRS ports.

[0125] In a fifth additional aspect, either alone or in combination with one or more of the first to fourth aspects, the first MIMO precoder indicates at least one of a first uplink TCI state, a first SRI, or a first TPMI, and the second MIMO precoder indicates at least one of a second uplink TCI state, a second SRI, or a second TPMI.

[0126] In a sixth additional aspect, either alone or in combination with one or more of the first to fifth aspects, receiving DCI indicating precoding information includes receiving an indication that the number of layers associated with a multi-panel uplink transmission indicates that the multi-panel uplink transmission is associated with a single layer, a DMRS port configuration indicates the DMRS ports associated with the multi-panel uplink transmission, and a MIMO precoding configuration indicates a first MIMO precoder associated with the first antenna panel and the DMRS ports and a second MIMO precoder associated with the second antenna panel and the DMRS ports.

[0127] In a seventh additional aspect, either alone or in combination with one or more of the first to sixth aspects, precoding a multi-panel uplink transmission for transmission via a first antenna panel of a UE and a second antenna panel of the UE includes: applying the first MIMO precoder indicated by the MIMO precoding configuration to the DMRS ports indicated by the DMRS port configuration to generate a multi-panel uplink transmission for the first antenna panel; and applying the second MIMO precoder indicated by the MIMO precoding configuration to the DMRS ports to generate a multi-panel uplink transmission for the second antenna panel.

[0128] In an eighth additional aspect, either alone or in combination with one or more of the first to seventh aspects, transmitting a precoded multi-panel uplink transmission includes transmitting at least one of an SFN multi-panel uplink transmission or an FDM multi-panel uplink transmission.

[0129] In a ninth additional aspect, either alone or in combination with one or more of the first to eighth aspects, the multi-panel uplink transmission is an FDM multi-panel uplink transmission, and the precoding information includes a transform precoding configuration indicating a transform precoder size that is at least partially based on the size of the FDRA associated with the multi-panel uplink transmission.

[0130] In a tenth additional aspect, either alone or in combination with one or more of the first to ninth aspects, the number of layers associated with the multi-panel uplink transmission indicates that the multi-panel uplink transmission is associated with a single layer.

[0131] In an eleventh additional aspect, either alone or in combination with one or more of the first or second aspects, the DMRS port configuration indicates a first DMRS port associated with the multi-panel uplink transmission and a second DMRS port associated with the multi-panel uplink transmission.

[0132] In a twelfth additional aspect, either alone or in combination with one or more of the first, second, or eleventh aspects, the number of layers associated with a multi-panel uplink transmission indicates that the multi-panel uplink transmission is associated with a single layer.

[0133] In a thirteenth additional aspect, either alone or in combination with one or more of the first, second, eleventh, or twelfth aspects, the DMRS port configuration indicates that a first DMRS port is associated with a first antenna panel and a second DMRS port is associated with a second antenna panel.

[0134] In a fourteenth additional aspect, either alone or in combination with one or more of the first, second, or eleventh to thirteenth aspects, the DMRS port configuration indicates a first PTRS associated with the first DMRS port and a second PTRS associated with the second DMRS port.

[0135] In a fifteenth additional aspect, either alone or in combination with one or more of the first, second, or eleventh to fourteenth aspects, the DMRS port configuration indicates that the first DMRS port and the second DMRS port are associated with the same DMRS CDM group.

[0136] In a sixteenth additional aspect, either alone or in combination with one or more of the first, second, or eleventh to fourteenth aspects, the DMRS port configuration indicates that the first DMRS port is associated with a first DMRS CDM group and the second DMRS port is associated with a second DMRS CDM group.

[0137] In a seventeenth additional aspect, either alone or in combination with one or more of the first, second, or eleventh to sixteenth aspects, the MIMO precoding configuration indicates a first MIMO precoder associated with the first antenna panel and the first DMRS port and a second MIMO precoder associated with the second antenna panel and the second DMRS port.

[0138] In an eighteenth additional aspect, either alone or in combination with one or more of the first, second, or eleventh to seventeenth aspects, the DCI that receives precoding information includes receiving an indication that the number of layers associated with a multi-panel uplink transmission indicates that the multi-panel uplink transmission is associated with a single layer, and the DMRS port configuration indicates a first DMRS port associated with the multi-panel uplink transmission and a second DMRS port associated with the multi-panel uplink transmission.

[0139] In a nineteenth additional aspect, alone or in combination with one or more of the first, second, or eleventh to eighteenth aspects, the DMRS port configuration indicates that the first DMRS port and the second DMRS port are associated with the same DMRS CDM group or different DMRS CDM groups.

[0140] In a twentieth additional aspect, alone or in combination with one or more of the first, second, or eleventh to nineteenth aspects, precoding a multi-panel uplink transmission for transmission via a first antenna panel of a UE and a second antenna panel of the UE includes: applying a first MIMO precoder to the first DMRS port to generate a multi-panel uplink transmission for the first antenna panel; and applying a second MIMO precoder to the second DMRS port to generate a multi-panel uplink transmission for the second antenna panel.

[0141] In a twenty-first additional aspect, alone or in combination with one or more of the first, second, or eleventh to twentieth aspects, transmitting a precoded multi-panel uplink transmission includes transmitting an SFN multi-panel uplink transmission.

[0142] In a twenty-second additional aspect, alone or in combination with one or more of the first or second aspects, the number of layers associated with a multi-panel uplink transmission indicates a first layer associated with the multi-panel uplink transmission and a second layer associated with the multi-panel uplink transmission.

[0143] In a twenty-third additional aspect, alone or in combination with one or more of the first, second, or twenty-second aspects, the DMRS port configuration indicates a first DMRS port associated with the first layer and a second DMRS port associated with the second layer.

[0144] In a twenty-fourth additional aspect, alone or in combination with one or more of the first, second, twenty-second, or twenty-third aspects, the DMRS port configuration indicates that the first DMRS port is associated with a first DMRS CDM group and the second DMRS port is associated with a second DMRS CDM group.

[0145] In a twenty-fifth additional aspect, alone or in combination with one or more of the first, second, or twenty-second to twenty-fourth aspects, the MIMO precoding configuration indicates a first MIMO precoder associated with the first antenna panel and the first layer and a second MIMO precoder associated with the second antenna panel and the second layer.

[0146] In a twenty-sixth additional aspect, either alone or in combination with one or more of the first aspect, the second aspect, or the twenty-second aspect to the twenty-fifth aspect, receiving DCI indicating precoding information includes receiving an indication that the number of layers associated with a multi-panel uplink transmission indicates a first layer and a second layer associated with the multi-panel uplink transmission, and the DMRS port configuration indicates a first DMRS port associated with the first layer and a first DMRS CDM group and a second DMRS port associated with the second layer and a second DMRS CDM group.

[0147] In a twenty-seventh additional aspect, either alone or in combination with one or more of the first aspect, the second aspect, or the twenty-second aspect to the twenty-sixth aspect, precoding a multi-panel uplink transmission for transmission via a first antenna panel of a UE and a second antenna panel of the UE includes: mapping the multi-panel uplink transmission to a first layer and a second layer; applying a first MIMO precoder to the first DMRS port and the first layer to generate a multi-panel uplink transmission for the first antenna panel; and applying a second MIMO precoder to the second DMRS port and the second layer to generate a multi-panel uplink transmission for the second antenna panel.

[0148] In a twenty-eighth additional aspect, either alone or in combination with one or more of the first aspect, the second aspect, or the twenty-second aspect to the twenty-seventh aspect, precoding a multi-panel uplink transmission for transmission via a first antenna panel of a UE and a second antenna panel of the UE includes: applying a first transform precoder to the first layer to generate a multi-panel uplink transmission for the first antenna panel; and applying a second transform precoder to the second layer to generate a multi-panel uplink transmission for the second antenna panel.

[0149] Although Figure 9 example blocks of process 900 are shown, in some aspects, compared to the blocks described in Figure 9 process 900 may include additional blocks, fewer blocks, different blocks, or differently arranged blocks. Additionally or alternatively, two or more of the blocks of process 900 may be executed in parallel.

[0150] Figure 10 is a flow chart showing an example process 1000, such as performed by a base station, according to various aspects of the present disclosure. Example process 1000 is an example of operations performed by a base station (e.g., base station 110) associated with a multi-panel uplink transmission with precoding.

[0151] As Figure 10As shown, in some aspects, process 1000 may include: determining precoding information for a multi-panel uplink transmission associated with a UE, the precoding information including at least one of a DMRS port configuration associated with the multi-panel uplink transmission, a MIMO precoding configuration associated with the multi-panel uplink transmission, or a number of layers associated with the multi-panel uplink transmission (block 1010). For example, a base station may (e.g., by using Figure 12 the determination component 1210 depicted in) determine precoding information for a multi-panel uplink transmission associated with a UE, the precoding information including at least one of a DMRS port configuration associated with the multi-panel uplink transmission, a MIMO precoding configuration associated with the multi-panel uplink transmission, or a number of layers associated with the multi-panel uplink transmission, as described above.

[0152] As Figure 10 further shown, in some aspects, process 1000 may include: sending to the UE a DCI indicating the precoding information associated with the multi-panel uplink transmission (block 1020). For example, the UE may (e.g., by using Figure 12 the transmission component 1206 depicted in) send to the UE a DCI indicating the precoding information associated with the multi-panel uplink transmission, as described above.

[0153] Process 1000 may include additional aspects, such as any single aspect or any combination of aspects described below or in combination with one or more other processes described elsewhere herein.

[0154] In a first additional aspect, process 1000 includes: receiving from the UE a multi-panel uplink transmission pre-coded by the UE at least partially based on the precoding information.

[0155] In a second additional aspect, either alone or in combination with the first aspect, determining the precoding information includes: determining a transform precoding configuration associated with the multi-panel uplink transmission.

[0156] In a third additional aspect, either alone or in combination with one or more of the first and second aspects, determining the precoding information includes: determining that the MIMO precoding configuration includes a first MIMO precoder associated with a first antenna panel of the UE and a second MIMO precoder associated with a second antenna panel of the UE.

[0157] In a fourth additional aspect, either alone or in combination with one or more of the first through third aspects, determining the precoding information includes: determining that the DMRS port configuration includes the UE's DMRS ports associated with the multi-panel uplink transmission.

[0158] In a fifth additional aspect, either alone or in combination with one or more of the first to fourth aspects, determining precoding information includes: determining that a MIMO precoding configuration includes a first MIMO precoder associated with a first antenna panel of a UE and a DMRS port of the UE, and a second MIMO precoder associated with a second antenna panel of the UE and a DMRS port of the UE.

[0159] In a sixth additional aspect, either alone or in combination with one or more of the first to fifth aspects, determining precoding information includes determining that: the first MIMO precoder includes at least one of a first uplink TCI state, a first SRI, or a first TPMI, and the second MIMO precoder includes at least one of a second uplink TCI state, a second SRI, or a second TPMI.

[0160] In a seventh additional aspect, either alone or in combination with one or more of the first to sixth aspects, process 1000 includes: receiving a multi-panel uplink transmission that is at least one of an SFN multi-panel uplink transmission or an FDM multi-panel uplink transmission.

[0161] In an eighth additional aspect, either alone or in combination with one or more of the first to seventh aspects, the multi-panel uplink transmission is an FDM multi-panel uplink transmission, and determining precoding information includes: determining a transform precoder size associated with the multi-panel uplink transmission based at least in part on a size of an FDRA associated with the multi-panel uplink transmission.

[0162] In a ninth additional aspect, either alone or in combination with one or more of the first to eighth aspects, the number of layers associated with the multi-panel uplink transmission indicates that the multi-panel uplink transmission is associated with a single layer.

[0163] In a tenth additional aspect, either alone or in combination with one or more of the first to third aspects, determining precoding information includes: determining that a DMRS port configuration includes a first DMRS port of the UE associated with the multi-panel uplink transmission and a second DMRS port of the UE associated with the multi-panel uplink transmission.

[0164] In an eleventh additional aspect, either alone or in combination with one or more of the first to third aspects, or the tenth aspect, determining precoding information includes: determining that the multi-panel uplink transmission is associated with a single layer.

[0165] In a twelfth additional aspect, determining precoding information, either alone or in combination with one or more of the first aspect to the third aspect, the tenth aspect or the eleventh aspect, includes: determining that a first DMRS port is associated with a first antenna panel of the UE, and a second DMRS port is associated with a second antenna panel of the UE.

[0166] In a thirteenth additional aspect, determining precoding information, either alone or in combination with one or more of the first aspect to the third aspect, or the third aspect to the twelfth aspect, includes: determining a first PTRS associated with the first DMRS port and a second PTRS associated with the second DMRS port.

[0167] In a fourteenth additional aspect, determining precoding information, either alone or in combination with one or more of the first aspect to the third aspect, or the tenth aspect to the thirteenth aspect, includes: determining a DMRS CDM group associated with the first DMRS port and associated with the second DMRS port.

[0168] In a fifteenth additional aspect, determining precoding information, either alone or in combination with one or more of the first aspect to the third aspect, or the tenth aspect to the fourteenth aspect, includes: determining a first DMRS CDM group associated with the first DMRS port, and determining a second DMRS CDM group associated with the second DMRS port.

[0169] In a sixteenth additional aspect, determining precoding information, either alone or in combination with one or more of the first aspect to the third aspect, or the tenth to the fifteenth aspect, includes: determining that the MIMO and encoder configuration includes a first MIMO precoder associated with the first antenna panel of the UE and the first DMRS port of the UE, and a second MIMO precoder associated with the second antenna panel of the UE and the second DMRS port of the UE.

[0170] In a seventeenth additional aspect, determining precoding information, either alone or in combination with one or more of the first aspect to the third aspect, or the tenth aspect to the sixteenth aspect, process 1000 includes: receiving a multi-panel uplink transmission as an SFN multi-panel uplink transmission.

[0171] In an eighteenth additional aspect, determining precoding information, either alone or in combination with one or more of the first aspect to the third aspect, includes: determining that the multi-panel uplink transmission includes a first layer and a second layer.

[0172] In a nineteenth additional aspect, alone or in combination with one or more of the first aspect to the third aspect, or the eighteenth aspect, determining precoding information includes: determining that a DMRS port configuration includes a first DMRS port of a UE associated with a first layer and a second DMRS port of the UE associated with a second layer.

[0173] In a twentieth additional aspect, alone or in combination with one or more of the first aspect to the third aspect, the eighteenth aspect, or the nineteenth aspect, determining precoding information includes: determining a first DMRS CDM group associated with the first DMRS port, and determining a second DMRS CDM group associated with the second DMRS port.

[0174] In a twenty - first additional aspect, alone or in combination with one or more of the first aspect to the third aspect, or the eighteenth aspect to the twentieth aspect, determining precoding information includes: an MIMO precoding configuration includes a first MIMO precoder associated with a first antenna panel of the UE and a first layer, and a second MIMO precoder associated with a second antenna panel of the UE and a second layer.

[0175] In a twenty - second additional aspect, alone or in combination with one or more of the first aspect to the third aspect, or the eighteenth aspect to the twenty - first aspect, determining precoding information includes: determining a first transform precoder associated with the first layer, and determining a second transform precoder associated with the second layer.

[0176] Although Figure 10 example blocks of process 1000 are shown, in some aspects, compared to the blocks described in Figure 10 process 1000 may include additional blocks, fewer blocks, different blocks, or differently arranged blocks. Additionally or alternatively, two or more blocks of process 1000 may be executed in parallel.

[0177] Figure 11 is a block diagram of an example apparatus 1100 for wireless communication according to various aspects of the present disclosure. Apparatus 1100 may be a UE, or a UE may include apparatus 1100. In some aspects, apparatus 1100 includes a receiving component 1102, a communication manager 1104, and a transmitting component 1106, which may communicate with each other (e.g., via one or more buses). As shown, apparatus 1100 may use receiving component 1102 and transmitting component 1106 to communicate with another apparatus 1108 (e.g., a UE, a base station, or another wireless communication device).

[0178] In some aspects, apparatus 1100 may be configured to perform herein in connection with Figures 5 - 8One or more operations described. Additionally or alternatively, apparatus 1100 may be configured to perform one or more processes described herein, such as Figure 9 process 900. In some aspects, apparatus 1100 may include one or more components of the UE described above in connection with Figure 2 the UE.

[0179] Receiving component 1102 may receive communications from apparatus 1108, such as reference signals, control information, data communications, or combinations thereof. Receiving component 1102 may provide the received communications to one or more other components of apparatus 1100 (e.g., communication manager 1104). In some aspects, receiving component 1102 may perform signal processing on the received communications (e.g., filtering, amplification, demodulation, analog-to-digital conversion, demultiplexing, deinterleaving, demapping, equalization, interference cancellation, or decoding, etc.), and may provide the processed signals to one or more other components. In some aspects, receiving component 1102 may include one or more antennas, demodulators, MIMO detectors, receiving processors, controller / processors, memories, or combinations thereof of the UE described above in connection with Figure 2 the UE.

[0180] Transmitting component 1106 may send communications to apparatus 1108, such as reference signals, control information, data communications, or combinations thereof. In some aspects, communication manager 1104 may generate the communications, and may send the generated communications to transmitting component 1106 for transmission to apparatus 1108. In some aspects, transmitting component 1106 may perform signal processing on the generated communications (e.g., filtering, amplification, modulation, digital-to-analog conversion, multiplexing, interleaving, mapping, or encoding, etc.), and may send the processed signals to apparatus 1108. In some aspects, transmitting component 1106 may include one or more antennas, modulators, transmit MIMO processors, transmit processors, controller / processors, memories, or combinations thereof of the UE described above in connection with Figure 2 the UE. In some aspects, transmitting component 1106 may be collocated with receiving component 1102 in a transceiver.

[0181] The communication manager 1104 may receive or may cause the receiving component 1102 to receive DCI indicating precoding information associated with a multi-panel uplink transmission, where the precoding information includes at least one of a DMRS port configuration associated with the multi-panel uplink transmission, a MIMO precoding configuration associated with the multi-panel uplink transmission, or the number of layers associated with the multi-panel uplink transmission. The communication manager 1104 may precode the multi-panel uplink transmission at least in part based on the precoding information for transmission via a first antenna panel of the UE and a second antenna panel of the UE. The communication manager 1104 may use the first antenna panel and the second antenna panel to send the precoded multi-panel uplink transmission, or may cause the transmission component 1106 to use the first antenna panel and the second antenna panel to send the precoded multi-panel uplink transmission. In some aspects, the communication manager 1104 may perform one or more operations described elsewhere herein as being performed by one or more components of the communication manager 1104.

[0182] The communication manager 1104 may include the controller / processor, memory, or a combination thereof of the UE described above in connection with Figure 2 In some aspects, the communication manager 1104 includes a set of components, such as the signal generation component 1110. Alternatively, the set of components may be separate and distinct from the communication manager 1104. In some aspects, one or more components in the set of components may include the controller / processor, memory, or a combination thereof of the UE described above in connection with Figure 2 or may be implemented in the controller / processor, memory, or a combination thereof of the UE described above in connection with Figure 2 In addition or alternatively, one or more components in the set of components may be at least partially implemented as software stored in the memory. For example, a component (or a portion of a component) may be implemented as instructions or code stored in a non-transitory computer-readable medium and executable by a controller or processor to perform the functions or operations of the component.

[0183] The receiving component 1102 may receive DCI indicating precoding information associated with a multi-panel uplink transmission, where the precoding information includes at least one of a DMRS port configuration associated with the multi-panel uplink transmission, a MIMO precoding configuration associated with the multi-panel uplink transmission, or the number of layers associated with the multi-panel uplink transmission. The signal generation component 1110 may precode the multi-panel uplink transmission at least in part based on the precoding information for transmission via a first antenna panel of the UE and a second antenna panel of the UE. The transmission component 1106 may use the first antenna panel and the second antenna panel to send the precoded multi-panel uplink transmission.

[0184] In some aspects, the receiving component 1102 may receive the following indications: the number of layers associated with the multi-panel uplink transmission indicates that the multi-panel uplink transmission is associated with a single layer, the DMRS port configuration indicates the DMRS ports associated with the multi-panel uplink transmission, and the MIMO precoding configuration indicates a first MIMO precoder associated with the first antenna panel and the DMRS ports and a second MIMO precoder associated with the second antenna panel and the DMRS ports.

[0185] In some aspects, the receiving component 1102 may receive the following indications: the number of layers associated with the multi-panel uplink transmission indicates that the multi-panel uplink transmission is associated with a single layer, and the DMRS port configuration indicates a first DMRS port associated with the multi-panel uplink transmission and a second DMRS port associated with the multi-panel uplink transmission.

[0186] In some aspects, the receiving component 1102 may receive the following indications: the number of layers associated with the multi-panel uplink transmission indicates a first layer associated with the multi-panel uplink transmission and a second layer associated with the multi-panel uplink transmission, and the DMRS port configuration indicates a first DMRS port associated with the first layer and the first DMRS CDM group and a second DMRS port associated with the second layer and the second DMRS CDM group.

[0187] In some aspects, the signal generation component 1110 may apply the first MIMO precoder indicated by the MIMO precoding configuration to the DMRS ports indicated by the DMRS port configuration to generate a multi-panel uplink transmission for the first antenna panel. In some aspects, the signal generation component 1110 may apply the second MIMO precoder indicated by the MIMO precoding configuration to the DMRS ports to generate a multi-panel uplink transmission for the second antenna panel.

[0188] In some aspects, the signal generation component 1110 may apply the first MIMO precoder to the first DMRS port to generate a multi-panel uplink transmission for the first antenna panel. In some aspects, the signal generation component 1110 may apply the second MIMO precoder to the second DMRS port to generate a multi-panel uplink transmission for the second antenna panel.

[0189] In some aspects, the signal generation component 1110 may map a multi-panel uplink transmission to a first layer and a second layer. In some aspects, the signal generation component 1110 may apply a first MIMO precoder to a first DMRS port and the first layer to generate a multi-panel uplink transmission for a first antenna panel. In some aspects, the signal generation component 1110 may apply a second MIMO precoder to a second DMRS port and the second layer to generate a multi-panel uplink transmission for a second antenna panel.

[0190] In some aspects, the signal generation component 1110 may apply a first transform precoder to the first layer to generate a multi-panel uplink transmission for a first antenna panel. In some aspects, the signal generation component 1110 may apply a second transform precoder to the second layer to generate a multi-panel uplink transmission for a second antenna panel.

[0191] Figure 11 The number and arrangement of components shown are provided as an example. In practice, there may be additional components, fewer components, different components, or components arranged differently compared to Figure 11 those shown. Additionally, Figure 11 two or more components shown may be implemented in a single component, or Figure 11 a single component shown may be implemented as multiple distributed components. Additionally or alternatively, Figure 11 a set of components shown (e.g., one or more components) may perform one or more functions described as being performed by Figure 11 another set of components shown.

[0192] Figure 12 is a block diagram of an example apparatus 1200 for wireless communication according to various aspects of the present disclosure. The apparatus 1200 may be a base station, or a base station may include the apparatus 1200. In some aspects, the apparatus 1200 includes a receiving component 1202, a communication manager 1204, and a transmitting component 1206, which may communicate with each other (e.g., via one or more buses). As shown, the apparatus 1200 may communicate with another apparatus 1208 (e.g., a UE, a base station, or another wireless communication device) using the receiving component 1202 and the transmitting component 1206.

[0193] In some aspects, the apparatus 1200 may be configured to perform one or more operations described herein in connection with Figures 5 - 8 Additionally or alternatively, the apparatus 1200 may be configured to perform one or more processes described herein, such as Figure 10 the process 1000. In some aspects, the apparatus 1200 may include the above-described in connection with Figure 2One or more components of the described base station.

[0194] The receiving component 1202 can receive communications from the device 1208, such as reference signals, control information, data communications, or a combination thereof. The receiving component 1202 can provide the received communications to one or more other components of the device 1200 (e.g., the communication manager 1204). In some aspects, the receiving component 1202 can perform signal processing on the received communications (e.g., filtering, amplification, demodulation, analog-to-digital conversion, demultiplexing, deinterleaving, demapping, equalization, interference cancellation, or decoding, etc.), and can provide the processed signals to one or more other components. In some aspects, the receiving component 1202 can include one or more antennas, demodulators, MIMO detectors, receiving processors, controllers / processors, memories, or a combination thereof as described above in connection with Figure 2 One or more components of the described base station.

[0195] The transmitting component 1206 can send communications to the device 1208, such as reference signals, control information, data communications, or a combination thereof. In some aspects, the communication manager 1204 can generate the communications and can send the generated communications to the transmitting component 1206 for transmission to the device 1208. In some aspects, the transmitting component 1206 can perform signal processing on the generated communications (e.g., filtering, amplification, modulation, digital-to-analog conversion, multiplexing, interleaving, mapping, or encoding, etc.), and can send the processed signals to the device 1208. In some aspects, the transmitting component 1206 can include one or more antennas, modulators, transmitting MIMO processors, transmitting processors, controllers / processors, memories, or a combination thereof as described above in connection with Figure 2 One or more components of the described base station. In some aspects, the transmitting component 1206 can be co-located with the receiving component 1202 in a transceiver.

[0196] The communication manager 1204 can determine precoding information for a multi-panel uplink transmission associated with a UE, where the precoding information includes at least one of a DMRS port configuration associated with the multi-panel uplink transmission, a MIMO precoding configuration associated with the multi-panel uplink transmission, or the number of layers associated with the multi-panel uplink transmission. The communication manager 1204 can send to the UE or cause the transmitting component 1206 to send to the UE a DCI indicating the precoding information associated with the multi-panel uplink transmission. In some aspects, the communication manager 1204 can perform one or more operations described elsewhere herein as being performed by one or more components of the communication manager 1204.

[0197] The communication manager 1204 can include one or more as described above in connection with Figure 2The controller / processor, memory, scheduler, communication unit, or combination thereof of the described base station. In some aspects, communication manager 1204 includes a set of components, such as determination component 1210. Alternatively, the set of components can be separate and different from communication manager 1204. In some aspects, one or more components in the set of components can include the controller / processor, memory, scheduler, communication unit, or combination thereof of the base station described above in connection with Figure 2 or can be implemented within the controller / processor, memory, scheduler, communication unit, or combination thereof of the base station described above in connection with Figure 2 . Additionally or alternatively, one or more components of the set of components can be at least partially implemented as software stored in a memory. For example, a component (or a portion of a component) can be implemented as instructions or code stored in a non-transitory computer-readable medium and executable by a controller or processor to perform the functions or operations of the component.

[0198] Determination component 1210 can determine precoding information for a multi-panel uplink transmission associated with a UE, where the precoding information includes at least one of a DMRS port configuration associated with the multi-panel uplink transmission, a MIMO precoding configuration associated with the multi-panel uplink transmission, or a number of layers associated with the multi-panel uplink transmission. Transmission component 1206 can send a DCI indicating the precoding information associated with the multi-panel uplink transmission to the UE.

[0199] Receiving component 1202 can receive a multi-panel uplink transmission from the UE according to the precoding information. Receiving component 1202 can receive the multi-panel uplink transmission as at least one of an SFN multi-panel uplink transmission or an FDM multi-panel uplink transmission.

[0200] Determination component 1210 can determine a first DMRS CDM group associated with a first DMRS port. Determination component 1210 can determine a second DMRS CDM group associated with a second DMRS port. Determination component 1210 can determine a first transform precoder associated with a first layer. Determination component 1210 can determine a second transform precoder associated with a second layer.

[0201] Figure 12 The number and arrangement of the components shown in Figure 12 are provided as an example. In practice, there can be additional components, fewer components, different components, or differently arranged components compared to those shown in Figure 12 . Additionally, two or more components shown in Figure 12 can be implemented in a single component, or a single component shown inFigure 12 The set of components (e.g., one or more components) shown in Figure 12 can perform one or more functions described as being performed by another set of components shown in

[0202] The foregoing disclosure provides illustration and description, but is not intended to be exhaustive or to limit the various aspects to the precise forms disclosed. Modifications and variations may be made in light of the foregoing disclosure, or may be obtained from practice of the various aspects.

[0203] As used herein, the term "component" is intended to be broadly construed as hardware, firmware, or a combination of hardware and software. As used herein, a processor is implemented using hardware, firmware, or a combination of hardware and software. It will be apparent that the systems or methods described herein may be implemented in different forms of hardware, firmware, or a combination of hardware and software. The actual specific control hardware or software code used to implement such systems or methods is not a limitation on the various aspects. Accordingly, the operation and performance of the systems or methods are described herein without reference to specific software code, and it should be understood that software and hardware can be designed to implement such systems or methods based at least in part on the description herein.

[0204] As used herein, depending on the context, meeting a threshold may 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, or a combination thereof.

[0205] Although specific combinations of features are recited in the claims and / or disclosed in the specification, these combinations are not intended to limit the disclosure of the various aspects. In fact, many of these features may be combined in ways not specifically recited in the claims or disclosed in the specification. While each of the dependent claims listed below may directly depend on only one claim, the disclosure of the various aspects includes each dependent claim in combination with every other claim item in the set of claims. The phrase referring to a list of items "at least one of" refers to any combination of those items (including a single member). For example, "at least one of a, b, or c" is intended to cover a, b, c, a - b, a - c, b - c, and a - b - c, as well as any combination with multiple identical elements (e.g., a - a, a - a - a, a - a - b, a - a - c, a - b - b, a - c - c, b - b, b - b - b, b - b - c, c - c, and c - c - c, or any other ordering of a, b, and c).

[0206] Elements, acts, or instructions used herein should not be construed as critical or essential, unless so expressly described. Further, as used herein, the articles "a" and "an" are intended to include one or more items and may be used interchangeably with "one or more." Further, 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." Further, as used herein, the terms "set" and "group" are intended to include one or more items (e.g., related items, unrelated items, or a combination of related and unrelated items) and may be used interchangeably with "one or more." Where only one item is intended, the phrase "only one" or similar language is used. Further, as used herein, the terms "have", "having", "include" and similar terms are intended to be open-ended terms. Further, the phrase "based on" is intended to mean "at least partially based on", unless otherwise expressly stated. Further, as used herein, the term "or" when used in a series is intended to be inclusive and may be used interchangeably with "and / or", unless otherwise expressly stated (e.g., if used in conjunction with "either" or "only one of").

Claims

1. A method of wireless communication performed by a user equipment (UE), comprising: receiving downlink control information (DCI) indicating precoding information associated with a multi-panel uplink transmission, the precoding information including a demodulation reference signal (DMRS) port configuration, a multiple-input multiple-output (MIMO) precoding configuration, and a number of layers, wherein: the number of layers indicates that the multi-panel uplink transmission is associated with a single layer, the DMRS port configuration indicates the DMRS ports associated with the multi-panel uplink transmission, and the MIMO precoding configuration indicates a first MIMO precoder associated with a first antenna panel and the DMRS ports and a second MIMO precoder associated with a second antenna panel and the DMRS ports; precoding the multi-panel uplink transmission at least partially based on the precoding information for transmission via the first antenna panel of the UE and the second antenna panel of the UE, wherein the precoding includes transform precoding; and using the first antenna panel and the second antenna panel to transmit the precoded multi-panel uplink transmission.

2. The method according to claim 1, wherein, the precoding information includes a transform precoding configuration associated with the multi-panel uplink transmission.

3. The method according to claim 1, wherein, precoding the multi-panel uplink transmission for transmission via the first antenna panel of the UE and the second antenna panel of the UE includes: applying the first MIMO precoder indicated by the MIMO precoding configuration to the DMRS ports to generate the multi-panel uplink transmission for the first antenna panel; and applying the second MIMO precoder indicated by the MIMO precoding configuration to the DMRS ports to generate the multi-panel uplink transmission for the second antenna panel.

4. The method according to claim 1, wherein, transmitting the precoded multi-panel uplink transmission includes transmitting at least one of a single-frequency network (SFN) multi-panel uplink transmission or a frequency-division multiplexing (FDM) multi-panel uplink transmission.

5. The method according to claim 1, wherein, the multi-panel uplink transmission is a frequency-division multiplexing (FDM) multi-panel uplink transmission; and wherein the precoding information includes a transform precoding configuration indicating the size of a transform precoder, the size of the transform precoder being at least partially based on the size of a frequency-domain resource allocation (FDRA) associated with the multi-panel uplink transmission.

6. The method according to claim 1, wherein, transmitting the precoded multi-panel uplink transmission includes: using a first sounding reference signal (SRS) resource set to generate a first signal for the multi-panel uplink transmission of the first antenna panel; and using a second sounding reference signal (SRS) resource set to generate a second signal for the multi-panel uplink transmission of the second antenna panel.

7. A user equipment (UE) for wireless communication, comprising: a memory; and one or more processors operatively coupled to the memory, the memory and the one or more processors being configured to: receive downlink control information (DCI) indicating precoding information associated with a multi-panel uplink transmission, the precoding information including demodulation reference signal (DMRS) port configuration, multiple-input multiple-output (MIMO) precoding configuration, and number of layers, wherein: the number of layers indicates that the multi-panel uplink transmission is associated with a single layer, the DMRS port configuration indicates the DMRS ports associated with the multi-panel uplink transmission, and the MIMO precoding configuration indicates a first MIMO precoder associated with a first antenna panel and the DMRS ports and a second MIMO precoder associated with a second antenna panel and the DMRS ports; at least partially based on the precoding information, precode the multi-panel uplink transmission for transmission via the first antenna panel of the UE and the second antenna panel of the UE, wherein the precoding includes transform precoding; and use the first antenna panel and the second antenna panel to transmit the precoded multi-panel uplink transmission.

8. The UE according to claim 7, wherein, the precoding information includes a transform precoding configuration associated with the multi-panel uplink transmission.

9. The UE according to claim 7, wherein, when precoding the multi-panel uplink transmission for transmission via the first antenna panel of the UE and the second antenna panel of the UE, the one or more processors are configured to: apply the first MIMO precoder indicated by the MIMO precoding configuration to the DMRS ports to generate the multi-panel uplink transmission for the first antenna panel; and apply the second MIMO precoder indicated by the MIMO precoding configuration to the DMRS ports to generate the multi-panel uplink transmission for the second antenna panel.

10. The UE according to claim 7, wherein, when transmitting the precoded multi-panel uplink transmission, the one or more processors are configured to: transmit at least one of a single-frequency network (SFN) multi-panel uplink transmission or a frequency-division multiplexing (FDM) multi-panel uplink transmission.

11. The UE according to claim 7, wherein, the multi-panel uplink transmission is a frequency-division multiplexing (FDM) multi-panel uplink transmission; and wherein the precoding information includes a transform precoding configuration indicating the size of a transform precoder, the size of the transform precoder being at least partially based on the size of a frequency-domain resource allocation (FDRA) associated with the multi-panel uplink transmission.

12. The UE according to claim 7, wherein, when transmitting the precoded multi-panel uplink transmission, the one or more processors are configured to: Generate a first signal for the multi-panel uplink transmission for the first antenna panel using a first sounding reference signal (SRS) resource set; And Generate a second signal for the multi-panel uplink transmission for the second antenna panel using a second sounding reference signal (SRS) resource set.

13. 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 user equipment (UE), cause the UE to perform the following operations: Receive downlink control information (DCI) indicating precoding information associated with a multi-panel uplink transmission, the precoding information including demodulation reference signal (DMRS) port configuration, multiple-input multiple-output (MIMO) precoding configuration, and number of layers, where: The number of layers indicates that the multi-panel uplink transmission is associated with a single layer, The DMRS port configuration indicates the DMRS ports associated with the multi-panel uplink transmission, and The MIMO precoding configuration indicates a first MIMO precoder associated with a first antenna panel and the DMRS ports and a second MIMO precoder associated with a second antenna panel and the DMRS ports; At least partially based on the precoding information, precode the multi-panel uplink transmission for transmission via the first antenna panel of the UE and the second antenna panel of the UE, where the precoding includes transform precoding; and use the first antenna panel and the second antenna panel to transmit the precoded multi-panel uplink transmission.

14. An apparatus for wireless communication, comprising: A unit for receiving downlink control information (DCI) indicating precoding information associated with a multi-panel uplink transmission, the precoding information including demodulation reference signal (DMRS) port configuration, multiple-input multiple-output (MIMO) precoding configuration, and number of layers, where: The number of layers indicates that the multi-panel uplink transmission is associated with a single layer, The DMRS port configuration indicates the DMRS ports associated with the multi-panel uplink transmission, and The MIMO precoding configuration indicates a first MIMO precoder associated with a first antenna panel and the DMRS ports and a second MIMO precoder associated with a second antenna panel and the DMRS ports; A unit for at least partially based on the precoding information, precoding the multi-panel uplink transmission for transmission via the first antenna panel of the apparatus and the second antenna panel of the apparatus, where the precoding includes transform precoding; and A unit for using the first antenna panel and the second antenna panel to transmit the precoded multi-panel uplink transmission.

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