WO2021184327A1

WO2021184327A1 - Association of transmission layers and codewords to enable uplink transmission with multiple codewords

Info

Publication number: WO2021184327A1
Application number: PCT/CN2020/080315
Authority: WO
Inventors: Fang Yuan; Mostafa KHOSHNEVISAN; Wooseok Nam; Tao Luo
Original assignee: Qualcomm Incorporated
Priority date: 2020-03-20
Filing date: 2020-03-20
Publication date: 2021-09-23

Abstract

Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a user equipment may determine an association between sets of transmission layers and multiple codewords that are to be used for an uplink communication that uses multiple antenna panels, and transmit the uplink communication using the multiple codewords based at least in part on the association. Numerous other aspects are provided.

Description

ASSOCIATION OF TRANSMISSION LAYERS AND CODEWORDS TO ENABLE UPLINK TRANSMISSION WITH MULTIPLE CODEWORDS

INTRODUCTION

Aspects of the present disclosure generally relate to wireless communication and to techniques and apparatuses for association of transmission layers and codewords.

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

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

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

SUMMARY

In some aspects, a method of wireless communication, performed by a UE, may include determining an association between sets of transmission layers and multiple codewords that are to be used for an uplink communication that uses multiple antenna panels. The method may include transmitting the uplink communication using the multiple codewords based at least in part on the association.

In some aspects, a method of wireless communication, performed by a base station, may include determining transmission parameters for multiple codewords of a UE that are to be used for an uplink communication that uses multiple antenna panels. The method may include transmitting downlink control information (DCI) that identifies the transmission parameters to enable the UE to determine an association between sets of transmission layers and the multiple codewords.

In some aspects, a UE for wireless communication may include a memory and one or more processors coupled to the memory. The memory and the one or more processors may be configured to determine an association between sets of transmission layers and multiple codewords that are to be used for an uplink communication that uses multiple antenna panels. The memory and the one or more processors may be configured to transmit the uplink communication using the multiple codewords based at least in part on the association.

In some aspects, a base station for wireless communication may include a memory and one or more processors coupled to the memory. The memory and the one or more processors may be configured to determine transmission parameters for multiple codewords of a UE that are to be used for an uplink communication that uses multiple antenna panels. The memory and the one or more processors may be configured to transmit DCI that identifies the transmission parameters to enable the UE to determine an association between sets of transmission layers and the multiple codewords.

In some aspects, a non-transitory computer-readable medium may store one or more instructions for wireless communication. The one or more instructions, when executed by one or more processors of a UE, may cause the one or more processors to determine an association between sets of transmission layers and multiple codewords that are to be used for an uplink communication that uses multiple antenna panels. The one or more instructions may cause the one or more processors to transmit the uplink communication using the multiple codewords based at least in part on the association.

In some aspects, a non-transitory computer-readable medium may store one or more instructions for wireless communication. The one or more instructions, when executed by one or more processors of a base station, may cause the one or more processors to determine transmission parameters for multiple codewords of a UE that are to be used for an uplink communication that uses multiple antenna panels. The one or more instructions may cause the one or more processors to transmit DCI that identifies the transmission parameters to enable the UE to determine an association between sets of transmission layers and the multiple codewords.

In some aspects, an apparatus for wireless communication may include means for determining an association between sets of transmission layers and multiple codewords that are to be used for an uplink communication that uses multiple antenna panels. The apparatus may include means for transmitting the uplink communication using the multiple codewords based at least in part on the association.

In some aspects, an apparatus for wireless communication may include means for determining transmission parameters for multiple codewords of a UE that are to be used for an uplink communication that uses multiple antenna panels. The apparatus may include means for transmitting DCI that identifies the transmission parameters to enable the UE to determine an association between sets of transmission layers and the multiple codewords.

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

The foregoing has outlined rather broadly the features and technical advantages of examples according to the disclosure in order that the detailed description that follows may be better understood. Additional features and advantages will be described hereinafter. The conception and specific examples disclosed may be readily 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. Characteristics of the concepts disclosed herein, both their organization and method of operation, together with associated advantages will be better understood from the following description when considered in connection with the accompanying figures. Each of the figures is provided for the purpose of illustration and description, and not as a definition of the limits of the claims.

BRIEF DESCRIPTION OF THE DRAWINGS

So that the above-recited features of the present disclosure can be understood in detail, a more particular description, briefly summarized above, may be had by reference to aspects, some of which are illustrated in the appended drawings. It is to be noted, however, that the appended drawings illustrate only certain typical aspects of this disclosure and are therefore not to be considered limiting of its scope, for the description may admit to other equally effective aspects. The same reference numbers in different drawings may identify the same or similar elements.

Fig. 1 is a block diagram conceptually illustrating an example of a wireless communication network, in accordance with various aspects of the present disclosure.

Fig. 2 is a block diagram conceptually illustrating an example of a base station in communication with a UE in a wireless communication network, in accordance with various aspects of the present disclosure.

Fig. 3 is a diagram illustrating an example of spatial division multiplexing, in accordance with various aspects of the present disclosure.

Fig. 4 is a diagram illustrating an example of demodulation reference signal (DMRS) indication, in accordance with various aspects of the present disclosure.

Figs. 5 and 6 are diagrams illustrating one or more examples of association of transmission layers and codewords to enable uplink transmission with multiple codewords, in accordance with various aspects of the present disclosure.

Fig. 7 is a diagram illustrating an example process performed, for example, by a UE, in accordance with various aspects of the present disclosure.

Fig. 8 is a diagram illustrating an example process performed, for example, by a base station, in accordance with various aspects of the present disclosure.

DETAILED DESCRIPTION

A UE may use multiple antenna panels for an uplink communication (e.g., for a non-coherent joint transmission) . In addition, a UE may use multiple codewords (e.g., two codewords) for an uplink communication that uses multiple antenna panels to thereby improve uplink throughput. For example, the UE may transmit a first codeword using multiple transmission layers for a first antenna panel, and a second codeword using multiple transmission layers for a second antenna panel.

It may be useful for the UE to determine a DMRS configuration for the multiple codewords used for an uplink communication. For example, it may be useful for the UE to determine an association between sets of transmission layers and codewords, an association between DMRS ports and codewords, a codeword-specific scrambling sequence, and/or the like. Some techniques and apparatuses described herein provide for DMRS configuration for multiple codewords used for an uplink communication.

Various aspects of the disclosure are described more fully hereinafter with reference to the accompanying drawings. This disclosure may, however, 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 disclosure to those skilled in the art. Based on the teachings herein one skilled in the art should appreciate that the scope of the disclosure is intended to cover any aspect of the disclosure disclosed herein, whether implemented independently of or combined with any other aspect of the 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 disclosure is intended to cover such an apparatus or method which is practiced using other structure, functionality, or structure and functionality in addition to or other than the various aspects of the disclosure set forth herein. It should be understood that any aspect of the disclosure disclosed herein may be embodied by one or more elements of a claim.

Several aspects of telecommunication systems 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, processes, algorithms, and/or the like (collectively referred to as “elements” ) . These elements may be implemented using hardware, software, or combinations thereof. Whether such elements are implemented as hardware or software depends upon the particular application and design constraints imposed on the overall system.

It should be noted that while aspects may be described herein using terminology commonly associated with 3G and/or 4G wireless technologies, aspects of the present disclosure can be applied in other generation-based communication systems, such as 5G and later, including NR technologies.

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

A BS may provide communication coverage for a macro cell, a pico cell, a femto cell, and/or another type of cell. A macro cell may cover a relatively large geographic area (e.g., several kilometers in radius) and may allow unrestricted access by UEs with service subscription. A pico cell may cover a relatively small geographic area and may allow unrestricted access by UEs with service subscription. A femto cell may cover a relatively small geographic area (e.g., a home) and may allow restricted access by UEs having association with the femto cell (e.g., UEs in a closed subscriber group (CSG) ) . A BS for a macro cell may be referred to as a macro BS. A BS for a pico cell may be referred to as a pico BS. A BS for a femto cell may be referred to as a femto BS or a home BS. In the example shown in Fig. 1, a BS 110a may be a macro BS for a macro cell 102a, a BS 110b may be a pico BS for a pico cell 102b, and a BS 110c may be a femto BS for a femto cell 102c. A BS may support one or multiple (e.g., three) cells. The terms “eNB” , “base station” , “NR BS” , “gNB” , “TRP” , “AP” , “node B” , “5G NB” , and “cell” may be used interchangeably herein.

In some examples, a cell may not necessarily be stationary, and the geographic area of the cell may move according to the location of a mobile BS. In some examples, the BSs may be interconnected to one another and/or to one or more other BSs or network nodes (not shown) in the wireless network 100 through various types of backhaul interfaces such as a direct physical connection, a virtual network, and/or the like using any suitable transport network.

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

Wireless network 100 may be a heterogeneous network that includes BSs of different types, e.g., macro BSs, pico BSs, femto BSs, relay BSs, and/or the like. These different types of BSs may have different transmit power levels, different coverage areas, and different impacts on interference in wireless network 100. For example, macro BSs may have a high transmit power level (e.g., 5 to 40 Watts) whereas pico BSs, femto BSs, and relay BSs may have lower transmit power levels (e.g., 0.1 to 2 Watts) .

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

UEs 120 (e.g., 120a, 120b, 120c) may be dispersed throughout wireless network 100, and each UE may be stationary or mobile. A UE may also be referred to as an access terminal, a terminal, a mobile station, a subscriber unit, a station, and/or the like. 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, a camera, a gaming device, a netbook, a smartbook, an ultrabook, a medical device or equipment, biometric sensors/devices, wearable devices (smart watches, smart clothing, smart glasses, smart wrist bands, smart jewelry (e.g., smart ring, smart bracelet) ) , an entertainment device (e.g., a music or video device, or a satellite radio) , a vehicular component or sensor, smart meters/sensors, industrial manufacturing equipment, a global positioning system device, or any other suitable device that is configured to communicate via a wireless or wired medium.

Some UEs may be considered machine-type communication (MTC) or evolved or enhanced machine-type communication (eMTC) UEs. MTC and eMTC UEs include, for example, robots, drones, remote devices, sensors, meters, monitors, location tags, and/or the like, that may communicate with a base station, another device (e.g., remote device) , or some other entity. A wireless node may provide, for example, connectivity for or to a network (e.g., a wide area network such as Internet or a cellular network) via a wired or wireless communication link. Some UEs may be considered Internet-of-Things (IoT) devices, and/or may be implemented as may be implemented as NB-IoT (narrowband internet of things) devices. Some UEs may be considered a Customer Premises Equipment (CPE) . UE 120 may be included inside a housing that houses components of UE 120, such as processor components, memory components, and/or the like.

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

As shown in Fig. 1, the UE 120 may include a communication manager 140. As described in more detail elsewhere herein, the communication manager 140 may determine an association between sets of transmission layers and multiple codewords that are to be used for an uplink communication that uses multiple antenna panels, transmit the uplink communication using the multiple codewords based at least in part on the association, and/or the like. Additionally, or alternatively, the communication manager 140 may perform one or more other operations described herein.

Similarly, the base station 110 may include a communication manager 150. As described in more detail elsewhere herein, the communication manager 150 may determine transmission parameters for multiple codewords of a UE that are to be used for an uplink communication that uses multiple antenna panels, transmit DCI that identifies the transmission parameters to enable the UE to determine an association between sets of transmission layers and the multiple codewords, and/or the like. Additionally, or alternatively, the communication manager 150 may perform one or more other operations described herein.

As indicated above, Fig. 1 is provided merely as an example. Other examples may differ from what is described with regard to Fig. 1.

Fig. 2 shows a block diagram of a design 200 of base station 110 and UE 120, which may be one of the base stations and one of the UEs in Fig. 1. 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 in general T ≥ 1 and R ≥ 1.

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

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

On the uplink, at UE 120, a transmit processor 264 may receive and process data from a data source 262 and control information (e.g., for reports comprising RSRP, RSSI, RSRQ, CQI, and/or the like) from controller/processor 280. Transmit processor 264 may also generate reference symbols for one or more reference signals. The symbols from transmit processor 264 may be precoded by a TX MIMO processor 266 if applicable, further processed by modulators 254a through 254r (e.g., for DFT-s-OFDM, CP-OFDM, and/or the like) , and transmitted to base station 110. At base station 110, the uplink signals from UE 120 and other UEs may be received by antennas 234, processed by demodulators 232, detected by a MIMO detector 236 if applicable, and further processed by a receive processor 238 to obtain decoded data and control information sent by UE 120. Receive processor 238 may provide the decoded data to a data sink 239 and the decoded control information to controller/processor 240. Base station 110 may include communication unit 244 and communicate to network controller 130 via communication unit 244. Network controller 130 may include communication unit 294, controller/processor 290, and memory 292.

Controller/processor 240 of base station 110, controller/processor 280 of UE 120, and/or any other component (s) of Fig. 2 may perform one or more techniques relating to association of transmission layers and codewords to enable uplink transmission with multiple codewords, as described in more detail elsewhere herein. For example, controller/processor 240 of base station 110, controller/processor 280 of UE 120, and/or any other component (s) of Fig. 2 may perform or direct operations of, for example, process 700 of Fig. 7, process 800 of Fig. 8, and/or other processes as described herein.

Memories

242 and 282 may store data and program codes for base station 110 and UE 120, respectively. A scheduler 246 may schedule UEs for data transmission on the downlink and/or uplink.

In some aspects, the UE 120 may include means for determining an association between sets of transmission layers and multiple codewords that are to be used for an uplink communication that uses multiple antenna panels, means for transmitting the uplink communication using the multiple codewords based at least in part on the association, and/or the like. Additionally, or alternatively, the UE 120 may include means for performing one or more other operations described herein. In some aspects, such means may include the communication manager 140. Additionally, or alternatively, such means may include one or more components of the UE 120 described in connection with Fig. 2.

In some aspects, the base station 110 may include means for determining transmission parameters for multiple codewords of a UE that are to be used for an uplink communication that uses multiple antenna panels, means for transmitting DCI that identifies the transmission parameters to enable the UE to determine an association between sets of transmission layers and the multiple codewords, and/or the like. Additionally, or alternatively, the base station 110 may include means for performing one or more other operations described herein. In some aspects, such means may include the communication manager 150. In some aspects, such means may include one or more components of the base station 110 described in connection with Fig. 2.

As indicated above, Fig. 2 is provided merely as an example. Other examples may differ from what is described with regard to Fig. 2.

Fig. 3 is a diagram illustrating an example of spatial division multiplexing, in accordance with various aspects of the present disclosure. In particular, reference number 305 shows spatial division multiplexing of a first physical uplink shared channel (PUSCH) transmission 310 (shown as PUSCH 1) and a second PUSCH transmission 315 (shown as PUSCH 2) . In spatial division multiplexing (e.g., non-coherent joint transmission) , a UE may transmit the first PUSCH transmission 310 and the second PUSCH transmission 315 in a same time and frequency resource, as scheduled by a single DCI.

In some aspects, a UE may transmit the first PUSCH transmission 310 using a first antenna panel of the UE, and the second PUSCH transmission 315 using a second antenna panel of the UE. In other words, the UE may form a first beam on the first antenna panel using a first precoding, and form a second beam on the second antenna panel using a second precoding. For a non-coherent joint transmission, the precoding (P) may be represented by

where

represents a precoder for a first layer for a first antenna panel (A) , and

represents a precoder for a second layer for a second antenna panel (B) . In some aspects, a UE may transmit an uplink communication based at least in part on a dynamic panel selection using precoding that may be represented by

or

In some aspects, a UE may transmit an uplink communication using a single antenna panel using precoding that may be represented by P= [v ₁v ₂…v _L] , where v _L represents a precoder for a layer L.

As shown by reference number 320, the first PUSCH transmission (PUSCH 1) may be associated with a first set of multiple transmission layers (shown as Layer Set 1) , and the second PUSCH transmission (PUSCH 2) may be associated with a second set of multiple transmission layers (shown as Layer Set 2) . Moreover, the first set of layers (e.g., for a MIMO transmission) may be associated with a first codeword (shown as Codeword 1) , and the second set of layers (e.g., for a MIMO transmission) may be associated with a second codeword (shown as Codeword 2) . The first codeword and the second codeword may be transport blocks.

As indicated above, Fig. 3 is provided as an example. Other examples may differ from what is described with respect to Fig. 3.

Fig. 4 is a diagram illustrating an example 400 of DMRS indication, in accordance with various aspects of the present disclosure. As shown in Fig. 4, a UE may be configured with one or more mappings of DMRS ports (shown as Port index) to DMRS code-division multiplexing (CDM) groups (shown as CDM group) . For example, the UE may be configured with a mapping 405 for type 1 DMRS and/or a mapping 410 for type 2 DMRS. The UE may use the mapping 405 and/or the mapping 410 to identify a CDM group to which an indicated (e.g., by downlink control information (DCI) ) DMRS port belongs and/or to identify DMRS ports that belong to an indicated (e.g., by DCI) CDM group.

As described above, a UE may use multiple antenna panels for an uplink communication (e.g., for a non-coherent joint transmission) . In some aspects, an antenna panel used for an uplink communication may be referred to as a PUSCH antenna port group (or an antenna port group) . In addition, as described above, a UE may use multiple codewords (e.g., two codewords) for an uplink communication that uses multiple antenna panels to thereby improve uplink throughput. For example, the UE may transmit a first codeword using multiple transmission layers for a first antenna panel, and a second codeword using multiple transmission layers for a second antenna panel.

In downlink communications that use multiple codewords, when more than four transmission layers (L) are to be used, the first

layers (e.g., according to layer index) may be associated with a first codeword and the remaining layers may be associated with a second codeword. However, a different mechanism for associating layers and codewords may be needed for uplink communications. Accordingly, it may be useful for the UE to determine a DMRS configuration for the multiple codewords used for an uplink communication. For example, it may be useful for the UE to determine an association between sets of transmission layers and codewords, an association between DMRS ports and codewords, a codeword-specific scrambling sequence, and/or the like. Some techniques and apparatuses described herein provide for DMRS configuration for multiple codewords used for an uplink communication.

As indicated above, Fig. 4 is provided merely as an example. Other examples may differ from what is described with regard to Fig. 4.

Fig. 5 is a diagram illustrating an example 500 of association of transmission layers and codewords to enable uplink transmission with multiple codewords, in accordance with various aspects of the present disclosure. As shown in Fig. 5, a UE 120 and a BS 110 may communicate with each other. In some aspects, the UE 120 may employ multiple transmit antenna panels (e.g., multiple PUSCH antenna port groups) . For example, the UE 120 may use a first antenna panel to transmit a first codeword in multiple transmission layers, and a second antenna panel to transmit a second codeword in multiple transmission layers. In some aspects, the first codeword may be associated with a first index value (e.g., codeword 0) and the second codeword may be associated with a second index value (e.g., codeword 1) .

As shown by reference number 505, the BS 110 may transmit, and the UE 120 may receive, DCI that schedules an uplink communication of the UE 120. For example, the DCI may schedule a multi-panel uplink communication of the UE 120, such as a first PUSCH transmission (e.g., of multiple layers) on a first antenna panel of the UE 120 and a second PUSCH transmission (e.g., of multiple layers) on a second antenna panel of the UE 120. The DCI may enable the UE 120 to determine an association between sets of transmission layers and the multiple codewords, as described below. In some aspects, the UE 120 may receive the DCI from a first TRP (e.g., associated with the BS 110) , and the DCI may schedule an uplink multi-panel communication to the first TRP and a second TRP (e.g., associated with the BS 110 or another BS) .

In some aspects, the DCI may identify transmission parameters for the uplink communication of the UE 120. For example, the BS 110 may determine transmission parameters for multiple codewords (e.g., two codewords) of the UE 120, and the DCI may identify the transmission parameters that are determined. Accordingly, the transmission parameters indicated by the DCI may include a first set of transmission parameters for a first PUSCH transmission of the UE 120, and a second set of transmission parameters for a second PUSCH transmission of the UE 120.

The transmission parameters may include one or more precoding indicators, such as one or more transmit precoder matrix indicators (TPMIs) (e.g., for codebook-based uplink) or one or more sounding reference signal (SRS) resource indicators (SRIs) (e.g., for non-codebook-based uplink) . For example, the transmission parameters may include a first precoding indicator for the first PUSCH transmission and a second precoding indicator for the second PUSCH transmission. A precoding indicator may identify multiple transmission layers that are to be transmitted using an antenna panel (e.g., a precoding indicator may identify a precoder matrix) .

The transmission parameters may include one or more uplink beam identifiers, such as one or more transmission configuration indicators (TCIs) . For example, the transmission parameters may include a first beam identifier for the first PUSCH transmission and a second beam identifier for the second PUSCH transmission. A TCI may indicate a TCI state associated with a beam, and the TCI state may be associated with a reference signal (RS) , such as an SRS resource, an SRS resource set, a channel state information (CSI) -RS, or a synchronization signal block (SSB) index. Accordingly, the UE 120 may transmit a PUSCH transmission using a beam or a spatial filter that corresponds to a beam or a spatial filter used for a reference signal associated with a TCI state indicated for the PUSCH transmission.

The transmission parameters may include one or more DMRS identifiers. For example, the transmission parameters may include a single DMRS identifier that identifies DMRS ports for the first PUSCH transmission and the second PUSCH transmission. Accordingly, the DMRS identifier may identify DMRS ports associated with multiple (e.g., at least two) CDM groups (e.g., according to mapping 405 or mapping 410, as described above) .

In some aspects, a DMRS identifier may be an index value of a mapping of DMRS ports. For example, the UE 120 may be configured with one or more mappings of DMRS ports that are to be used when multiple (e.g., two) codewords are to be transmitted by the UE 120 for the multi-panel uplink communication. In some aspects, the UE 120 may be configured with one or more of

mapping

605, 610, 615, 620, 625, or 630 of Fig. 6, as described below.

As shown by reference number 510, the UE 120 may determine a DMRS configuration for multiple codewords (e.g., two codewords) . For example, the UE 120 may determine a first DMRS configuration for a first codeword that is to be transmitted using a first antenna panel, and a second DMRS configuration for a second codeword that is to be transmitted using a second antenna panel. The DMRS configuration for the multiple codewords may be based at least in part on the transmission parameters identified by the DCI.

In some aspects, the UE 120 may determine an association between sets of transmission layers and the multiple codewords (e.g., determine a split of transmission layers scheduled for the multi-panel uplink communication among multiple codewords) . For example, the UE 120 may determine that a first set of layers (e.g., one or more layers) is associated with the first codeword and a second set of layers (e.g., one or more layers) is associated with the second codeword. In some aspects, the UE 120 may determine the association between the sets of layers and the multiple codewords based at least in part on CDM groups indicated for the multiple codewords (e.g., indicated by a DMRS identifier, as described above) .

As described above, the DCI may identify respective precoding indicators (e.g., respective SRIs or TPMIs) for the multiple PUSCH transmissions. A precoding indicator may indicate a set of layers that is to be used to transmit a PUSCH transmission. For example, a first precoding indicator (e.g., a first SRI or TPMI) may indicate a first set of layers for the first PUSCH transmission and a second precoding indicator (e.g., a second SRI or TPMI) may indicate a second set of layers for the second PUSCH transmission. Accordingly, the UE 120 may determine that the first codeword is to be transmitted using the first set of layers, and the second codeword is to be transmitted using the second set of layers.

Moreover, the UE 120 may determine that one or more first DMRS ports identified by a DMRS identifier are associated with a first CDM group (e.g., using mapping 405 or mapping 410, as described above) , one or more second DMRS ports identified by the DMRS identifier are associated with a second CDM group (e.g., using mapping 405 or mapping 410) , and so forth. Accordingly, the UE 120 may determine that the one or more first DMRS ports in the first CDM group are mapped to the first set of layers (for transmitting the first codeword) , and the one or more second DMRS ports in the second CDM group are mapped to the second set of layers (for transmitting the second codeword) . Thus, the UE 120 may transmit the first codeword using DMRS port (s) of the first CDM group, and the second codeword using DMRS port (s) of the second CDM group.

The first DMRS ports in the first CDM group may be quasi-co-located with a first TCI state indicated by the DCI, and the second DMRS ports in the second CDM group may be quasi-co-located with a second TCI state indicated by the DCI. Accordingly, the first codeword may be transmitted using a first beam, and the second codeword may be transmitted using a second beam.

In one or more examples, the first set of layers includes one layer (Layer 0) and the second set of layers includes one layer (Layer 1) (e.g., the multi-panel uplink communication has a rank of 2) , and the DMRS identifier of the DCI identifies a single DMRS port associated with a first CDM group (e.g., port 0) and a single DMRS port associated with a second CDM group (e.g., port 2) . Accordingly, the UE 120 may determine that the first set of layers (Layer 0) is to be used for the first codeword and the second set of layers (Layer 1) is to be used for the second codeword. Moreover, the UE 120 may determine that the first CDM group (port 0) is mapped to the first set of layers (Layer 0) and the second CDM group (port 2) is mapped to the second set of layers (Layer 1) .

In one or more examples, the first set of layers includes two layers (Layers 0 and 1) and the second set of layers includes one layer (Layer 2) (e.g., the multi-panel uplink communication has a rank of 3) , and the DMRS identifier of the DCI identifies two DMRS port associated with a first CDM group (e.g., ports 0 and 1) and a single DMRS port associated with a second CDM group (e.g., port 2) . Accordingly, the UE 120 may determine that the first set of layers (Layers 0 and 1) is to be used for the first codeword and the second set of layers (Layer 2) is to be used for the second codeword. Moreover, the UE 120 may determine that the first CDM group (ports 0 and 1) is mapped to the first set of layers (Layers 0 and 1) (e.g., in order) and the second CDM group (port 2) is mapped to the second set of layers (Layer 2) .

In one or more examples, the first set of layers includes one layer (Layer 0) and the second set of layers includes two layers (Layers 1 and 2) (e.g., the multi-panel uplink communication has a rank of 3) , and the DMRS identifier of the DCI identifies a single DMRS port associated with a first CDM group (e.g., port 0) and two DMRS port associated with a second CDM group (e.g., ports 2 and 3) . Accordingly, the UE 120 may determine that the first set of layers (Layer 0) is to be used for the first codeword and the second set of layers (Layers 1 and 2) is to be used for the second codeword. Moreover, the UE 120 may determine that the first CDM group (port 0) is mapped to the first set of layers (Layer 0) and the second CDM group (ports 2 and 3) is mapped to the second set of layers (Layers 1 and 2) (e.g., in order) .

In one or more examples, the first set of layers includes one layer (Layer 0) and the second set of layers includes two layers (Layers 1 and 2) (e.g., the multi-panel uplink communication has a rank of 3) , and the DMRS identifier of the DCI identifies a single DMRS port associated with a first CDM group (e.g., port 3) and two DMRS port associated with a second CDM group (e.g., ports 4 and 5) . Accordingly, the UE 120 may determine that the first set of layers (Layer 0) is to be used for the first codeword and the second set of layers (Layers 1 and 2) is to be used for the second codeword. Moreover, the UE 120 may determine that the first CDM group (port 3) is mapped to the first set of layers (Layer 0) and the second CDM group (ports 4 and 5) is mapped to the second set of layers (Layers 1 and 2) (e.g., in order) .

In one or more examples, the first set of layers includes two layers (Layers 0 and 1) and the second set of layers includes two layers (Layers 2 and 3) (e.g., the multi-panel uplink communication has a rank of 4) , and the DMRS identifier of the DCI identifies two DMRS ports associated with a first CDM group (e.g., ports 0 and 1) and two DMRS port associated with a second CDM group (e.g., ports 2 and 3) . Accordingly, the UE 120 may determine that the first set of layers (Layers 0 and 1) is to be used for the first codeword and the second set of layers (Layers 2 and 3) is to be used for the second codeword. Moreover, the UE 120 may determine that the first CDM group (ports 0 and 1) is mapped to the first set of layers (Layers 0 and 1) (e.g., in order) and the second CDM group (ports 2 and 3) is mapped to the second set of layers (Layers 2 and 3) (e.g., in order) .

In some aspects, other rank 4 configurations of the first set of layers and the second set of layers may be used. For example, the first set of layers may include one layer and the second set of layers may include three layers. As another example, the first set of layers may include three layers and the second set of layers may include one layer. In these examples, the DMRS identifier of the DCI may identify three DMRS ports associated with a first CDM group and one DMRS port associated with a second CDM group, and the CDM groups may be mapped to the layers as described above.

As shown by reference number 515, the UE 120 may communicate with the BS 110 using multiple antenna panels based at least in part on the determined DMRS configuration. For example, the UE 120 may transmit the multi-panel uplink communication based at least in part on the determined DMRS configuration. As an example, the UE 120 may transmit a first PUSCH transmission (e.g., transmit the first codeword in one or more transmission layers associated with the first codeword) using a first antenna port group, and transmit a second PUSCH transmission (e.g., transmit the second codeword in one or more transmission layers associated with the second codeword) using a second antenna port group. In some aspects, the UE 120 may transmit the first PUSCH transmission to a first TRP (e.g., associated with the BS 110) and the second PUSCH transmission to a second TRP (e.g., associated with the BS 110 or another BS) .

In some aspects, the UE 120 may transmit the multiple codewords using respective scrambling sequences. For example, the UE 120 may transmit the first codeword in the first PUSCH transmission using a first scrambling sequence, and the second codeword in the second PUSCH transmission using a second scrambling sequence. In some aspects, the UE 120 may determine respective scrambling sequences for the multiple codewords using a scrambling sequence generator. In some aspects, the UE 120 may initialize the scrambling sequence generator for a codeword using Equation 1:

c _init=n _RNTI·2 ¹⁵+q·2 ¹⁴+n _ID

Equation 1

where c _init represents an initial value for the scrambling sequence generator, n _RNTI represents a value of a radio network temporary identifier (RNTI) associated with the UE 120 (e.g., a value of a cell RNTI (C-RNTI) , a modulation and coding scheme cell RNTI (MCS-C-RNTI) , a configured scheduling RNTI (CS-RNTI) , and/or the like) , q represents an index value associated with the codeword (e.g., q = 0 for the first codeword, q = 1 for the second codeword, and so forth) , and n _ID represents a value for a higher-layer data scrambling identity PUSCH parameter (e.g., dataScramblingIdentityPUSCH) , when the parameter is configured and/or the PUSCH transmission is not scheduled using DCI format 0_0 in a common search space, or a value of a cell identifier

when the parameter is not configured and/or the PUSCH transmission is scheduled using DCI format 0_0 in a common search space.

As indicated above, Fig. 5 is provided as an example. Other examples may differ from what is described with respect to Fig. 5.

Fig. 6 is a diagram illustrating an example 600 of association of transmission layers and codewords to enable uplink transmission with multiple codewords, in accordance with various aspects of the present disclosure. In particular, Fig. 6 shows that the UE 120 may be configured with one or

more mappings

605, 610, 615, 620, 625, or 630. In some aspects, the UE 120 may use mapping 605 for type 1 DMRS, or mapping 610 for type 2 DMRS, when the multi-panel uplink communication has a rank of 2. In some aspects, the UE 120 may use mapping 615 for type 1 DMRS, or mapping 620 for type 2 DMRS, when the multi-panel uplink communication has a rank of 3. In some aspects, the UE 120 may use mapping 625 for type 1 DMRS, or mapping 630 for type 2 DMRS, when the multi-panel uplink communication has a rank of 4.

As described above, the mappings may map index values (shown as Value) to DMRS ports (shown as DMRS port (s) ) . For example, the transmission parameters of the DCI may indicate a DMRS identifier of 2 (e.g., for type 2 DMRS and a transmission rank of 3) , and the UE 120 may identify that

DMRS ports

0, 2, and 3 are to be used based at least in part on the DMRS identifier (e.g., using mapping 620) . Moreover, in this example, the UE 120 may determine that DMRS port 0 is associated with CDM group 0, and

DMRS ports

2 and 3 are associated with CDM group 1 according to mapping 410, as described above.

As indicated above, Fig. 6 is provided as an example. Other examples may differ from what is described with respect to Fig. 6.

Fig. 7 is a diagram illustrating an example process 700 performed, for example, by a UE, in accordance with various aspects of the present disclosure. Example process 700 is an example where the UE (e.g., UE 120, and/or the like) performs operations relating to association of transmission layers and codewords to enable uplink transmission with multiple codewords.

As shown in Fig. 7, in some aspects, process 700 may include determining an association between sets of transmission layers and multiple codewords that are to be used for an uplink communication that uses multiple antenna panels (block 710) . For example, the UE (e.g., using controller/processor 280, and/or the like) may determine an association between sets of transmission layers and multiple codewords that are to be used for an uplink communication that uses multiple antenna panels, as described above.

As further shown in Fig. 7, in some aspects, process 700 may include transmitting the uplink communication using the multiple codewords based at least in part on the association (block 720) . For example, the UE (e.g., using controller/processor 280, transmit processor 264, TX MIMO processor 266, MOD 254, antenna 252, and/or the like) may transmit the uplink communication using the multiple codewords based at least in part on the association, as described above.

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

In a first aspect, process 700 includes receiving DCI that identifies multiple SRIs or multiple TPMIs for the uplink communication, and the sets of transmission layers are indicated by the multiple SRIs or the multiple TPMIs.

In a second aspect, alone or in combination with the first aspect, process 700 includes receiving DCI that identifies multiple DMRS ports in multiple CDM groups for the uplink communication.

In a third aspect, alone or in combination with one or more of the first and second aspects, one or more first DMRS ports in a first CDM group are associated with a first set of layers that are to be used to transmit a first codeword, and one or more second DMRS ports in a second CDM group are associated with a second set of layers that are to be used to transmit a second codeword.

In a fourth aspect, alone or in combination with one or more of the first through third aspects, the one or more first DMRS ports are quasi-co-located with a first TCI state indicated by the DCI, and the one or more second DMRS ports are quasi-co-located with a second TCI state indicated by the DCI.

In a fifth aspect, alone or in combination with one or more of the first through fourth aspects, a first codeword is to be transmitted using a first scrambling sequence and a second codeword is to be transmitted using a second scrambling sequence.

In a sixth aspect, alone or in combination with one or more of the first through fifth aspects, a scrambling sequence for a codeword is based at least in part on an index value associated with the codeword.

Although Fig. 7 shows example blocks of process 700, in some aspects, process 700 may include additional blocks, fewer blocks, different blocks, or differently arranged blocks than those depicted in Fig. 7. Additionally, or alternatively, two or more of the blocks of process 700 may be performed in parallel.

Fig. 8 is a diagram illustrating an example process 800 performed, for example, by a base station, in accordance with various aspects of the present disclosure. Example process 800 is an example where the base station (e.g., base station 110, and/or the like) performs operations relating to association of transmission layers and codewords to enable uplink transmission with multiple codewords.

As shown in Fig. 8, in some aspects, process 800 may include determining transmission parameters for multiple codewords of a UE that are to be used for an uplink communication that uses multiple antenna panels (block 810) . For example, the base station (e.g., using controller/processor 240, and/or the like) may determine transmission parameters for multiple codewords of a UE that are to be used for an uplink communication that uses multiple antenna panels, as described above.

As further shown in Fig. 8, in some aspects, process 800 may include transmitting DCI that identifies the transmission parameters to enable the UE to determine an association between sets of transmission layers and the multiple codewords (block 820) . For example, the base station (e.g., using controller/processor 240, transmit processor 220, TX MIMO processor 230, MOD 232, antenna 234, and/or the like) may transmit DCI that identifies the transmission parameters to enable the UE to determine an association between sets of transmission layers and the multiple codewords, as described above.

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

In a first aspect, the transmission parameters identify multiple SRIs or multiple TPMIs for the uplink communication, and the sets of transmission layers are indicated by the multiple SRIs or the multiple TPMIs.

In a second aspect, alone or in combination with the first aspect, the transmission parameters identify multiple DMRS ports in multiple CDM groups for the uplink communication.

In a third aspect, alone or in combination with one or more of the first and second aspects, one or more first DMRS ports in a first CDM group are associated with a first set of layers that are to be used by the UE to transmit a first codeword, and one or more second DMRS ports in a second CDM group are associated with a second set of layers that are to be used by the UE to transmit a second codeword.

In a fifth aspect, alone or in combination with one or more of the first through fourth aspects, a first codeword is to be transmitted by the UE using a first scrambling sequence and a second codeword is to be transmitted by the UE using a second scrambling sequence.

Although Fig. 8 shows example blocks of process 800, in some aspects, process 800 may include additional blocks, fewer blocks, different blocks, or differently arranged blocks than those depicted in Fig. 8. Additionally, or alternatively, two or more of the blocks of process 800 may be performed in parallel.

The foregoing disclosure provides illustration and description, but is not intended to be exhaustive or to limit the aspects to the precise form disclosed. Modifications and variations may be made in light of the above disclosure or may be acquired from practice of the aspects.

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 in hardware, firmware, or a combination of hardware and software.

Some aspects are described herein in connection with thresholds. As used herein, satisfying 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, and/or the like.

It will be apparent that systems and/or methods described herein may be implemented in different forms of hardware, firmware, or a combination of hardware and software. The actual specialized control hardware or software code used to implement these systems and/or methods is not limiting of the aspects. Thus, the operation and behavior of the systems and/or methods were described herein without reference to specific software code-it being understood that software and hardware can be designed to implement the systems and/or methods based, at least in part, on the description herein.

Even though particular combinations of features are recited in the claims and/or disclosed in the specification, these combinations are not intended to limit the disclosure of various aspects. In fact, many of these features may be combined in ways not specifically recited in the claims and/or disclosed in the specification. Although each dependent claim listed below may directly depend on only one claim, the disclosure of various aspects includes each dependent claim in combination with every other claim in the claim set. A phrase referring to “at least one of” a list of items refers to any combination of those items, including single members. As an 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 multiples of the same element (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) .

No element, act, or instruction used herein should be construed as critical or essential unless explicitly described as such. Also, as used herein, the articles “a” and “an” are intended to include one or more items, and may be used interchangeably with “one or more. ” Furthermore, as used herein, the terms “set” and “group” are intended to include one or more items (e.g., related items, unrelated items, a combination of related and unrelated items, and/or the like) , and may be used interchangeably with “one or more. ” Where only one item is intended, the phrase “only one” or similar language is used. Also, as used herein, the terms “has, ” “have, ” “having, ” and/or the like are intended to be open-ended terms. Further, the phrase “based on” is intended to mean “based, at least in part, on” unless explicitly stated otherwise.

Claims

A method of wireless communication performed by a user equipment (UE) , comprising:

determining an association between sets of transmission layers and multiple codewords that are to be used for an uplink communication that uses multiple antenna panels; and

transmitting the uplink communication using the multiple codewords based at least in part on the association.
The method of claim 1, further comprising:

receiving downlink control information that identifies multiple sounding reference signal resource indicators (SRIs) or multiple transmit precoder matrix indicators (TPMIs) for the uplink communication,

wherein the sets of transmission layers are indicated by the multiple SRIs or the multiple TPMIs.
The method of claim 1, further comprising:

receiving downlink control information (DCI) that identifies multiple demodulation reference signal (DMRS) ports in multiple code-division multiplexing (CDM) groups for the uplink communication.
The method of claim 3, wherein one or more first DMRS ports in a first CDM group are associated with a first set of layers that are to be used to transmit a first codeword, and one or more second DMRS ports in a second CDM group are associated with a second set of layers that are to be used to transmit a second codeword.
The method of claim 4, wherein the one or more first DMRS ports are quasi-co-located with a first transmission configuration indicator (TCI) state indicated by the DCI, and the one or more second DMRS ports are quasi-co-located with a second TCI state indicated by the DCI.
The method of claim 1, wherein a first codeword is to be transmitted using a first scrambling sequence and a second codeword is to be transmitted using a second scrambling sequence.
The method of claim 6, wherein a scrambling sequence for a codeword is based at least in part on an index value associated with the codeword.
A method of wireless communication performed by a base station, comprising:

determining transmission parameters for multiple codewords of a user equipment (UE) that are to be used for an uplink communication that uses multiple antenna panels; and

transmitting downlink control information (DCI) that identifies the transmission parameters to enable the UE to determine an association between sets of transmission layers and the multiple codewords.
The method of claim 8, wherein the transmission parameters identify multiple sounding reference signal resource indicators (SRIs) or multiple transmit precoder matrix indicators (TPMIs) for the uplink communication, and the sets of transmission layers are indicated by the multiple SRIs or the multiple TPMIs.
The method of claim 8, wherein the transmission parameters identify multiple demodulation reference signal (DMRS) ports in multiple code-division multiplexing (CDM) groups for the uplink communication.
The method of claim 10, wherein one or more first DMRS ports in a first CDM group are associated with a first set of layers that are to be used by the UE to transmit a first codeword, and one or more second DMRS ports in a second CDM group are associated with a second set of layers that are to be used by the UE to transmit a second codeword.
The method of claim 11, wherein the one or more first DMRS ports are quasi-co-located with a first transmission configuration indicator (TCI) state indicated by the DCI, and the one or more second DMRS ports are quasi-co-located with a second TCI state indicated by the DCI.
The method of claim 8, wherein a first codeword is to be transmitted by the UE using a first scrambling sequence and a second codeword is to be transmitted by the UE using a second scrambling sequence.
The method of claim 13, wherein a scrambling sequence for a codeword is based at least in part on an index value associated with the codeword.
A user equipment for wireless communication, comprising:

a memory; and

one or more processors coupled to the memory, the memory and the one or more processors configured to:

determine an association between sets of transmission layers and multiple codewords that are to be used for an uplink communication that uses multiple antenna panels; and

transmit the uplink communication using the multiple codewords based at least in part on the association.
A base station for wireless communication, comprising:

a memory; and

one or more processors coupled to the memory, the memory and the one or more processors configured to:

determine transmission parameters for multiple codewords of a user equipment (UE) that are to be used for an uplink communication that uses multiple antenna panels; and

transmit downlink control information (DCI) that identifies the transmission parameters to enable the UE to determine an association between sets of transmission layers and the multiple codewords.
A non-transitory computer-readable medium storing one or more instructions for wireless communication, the one or more instructions comprising:

one or more instructions that, when executed by one or more processors of a user equipment, cause the one or more processors to:

determine an association between sets of transmission layers and multiple codewords that are to be used for an uplink communication that uses multiple antenna panels; and

transmit the uplink communication using the multiple codewords based at least in part on the association.
A non-transitory computer-readable medium storing one or more instructions for wireless communication, the one or more instructions comprising:

one or more instructions that, when executed by one or more processors of a base station, cause the one or more processors to:

determine transmission parameters for multiple codewords of a user equipment (UE) that are to be used for an uplink communication that uses multiple antenna panels; and

transmit downlink control information (DCI) that identifies the transmission parameters to enable the UE to determine an association between sets of transmission layers and the multiple codewords.
An apparatus for wireless communication, comprising:

means for determining an association between sets of transmission layers and multiple codewords that are to be used for an uplink communication that uses multiple antenna panels; and

means for transmitting the uplink communication using the multiple codewords based at least in part on the association.
An apparatus for wireless communication, comprising:

means for determining transmission parameters for multiple codewords of a user equipment (UE) that are to be used for an uplink communication that uses multiple antenna panels; and

means for transmitting downlink control information (DCI) that identifies the transmission parameters to enable the UE to determine an association between sets of transmission layers and the multiple codewords.