Configuration of phase tracking reference signal ports for uplink transmission over multiple codewords

Abstract

Various aspects of the present disclosure generally relate to wireless communications. In some aspects, a user device may determine an association between multiple phase tracking reference signal (PTRS) ports and multiple codewords to be used for uplink communications using multiple antenna port groups, and transmit uplink communications using the multiple codewords based at least in part on the association. Numerous other aspects are provided.

Description

Technical Field

[0001] Various aspects of the present disclosure generally relate to wireless communications and techniques and apparatus for Phase Tracking Reference Signal (PTRS) port configuration. Background Art

[0002] Wireless communication systems are widely deployed to provide a variety of telecommunication services, such as telephony, video, data, messaging, and broadcast. 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, etc.). Examples of such multiple access technologies include code division multiple access (CDMA) systems, time division multiple access (TDMA) systems, frequency division multiple access (FDMA) systems, orthogonal frequency division multiple access (OFDMA) systems, single-carrier frequency division multiple access (SC-FDMA) systems, time division synchronous code division multiple access (TD-SCDMA) systems, and long term evolution (LTE). LTE / LTE-Advanced is a set of enhancements to the Universal Mobile Telecommunications System (UMTS) mobile standard promulgated by the Third Generation Partnership Project (3GPP).

[0003] A wireless communication network may include multiple base stations (BSs) that may support communication for multiple user equipment (UEs). User equipment (UEs) may communicate with a base station (BS) via a downlink (DL) and an uplink (UL). A downlink (or forward link) refers to the communication link from the BS to the UE, while an uplink (or reverse link) refers to the communication link from the UE to the BS. As will be described in more detail herein, a BS may be referred to as a Node B, gNB, access point (AP), radio head, transmit receive point (TRP), new radio (NR) BS, 5G Node B, etc.

[0004] The above multiple access technologies have been adopted in various telecommunication standards to provide a common protocol that enables different user devices to communicate at municipal, national, regional, and even global levels. New Radio (NR), also known as 5G, is a set of enhancements to the LTE mobile standard released by the Third Generation Partnership Project (3GPP). NR is designed to better support mobile broadband Internet access by improving spectrum efficiency, reducing costs, improving services, utilizing new spectrum, and better integrating with other open standards. These open standards use orthogonal frequency division multiplexing (OFDM) (CP-OFDM) with a cyclic prefix (CP) on the downlink (DL) and CP-OFDM and / or SC-FDM (e.g., also known as discrete Fourier transform spread OFDM (DFT-s-OFDM)) on the uplink (UL) and support beamforming, multiple-input multiple-output (MIMO) antenna technology, and carrier aggregation. However, as the demand for mobile broadband access continues to increase, there is a need for further improvements to LTE and NR technologies. Preferably, these improvements should be applicable to other multiple access technologies and telecommunication standards that adopt these technologies. Summary of the Invention

[0005] In some aspects, a wireless communication method performed by a UE may include determining an association between a plurality of PTRS ports and a plurality of codewords to be used for uplink communication using a plurality of antenna port groups. The method may include transmitting the uplink communication using the plurality of codewords based at least in part on the association.

[0006] In some aspects, a wireless communication method performed by a base station may include determining transmission parameters for a plurality of codewords for a UE, the plurality of codewords to be used for uplink communication using a plurality of antenna port groups. The method may include sending downlink control information (DCI) identifying the transmission parameters to enable the UE to determine an association between the plurality of PTRS ports and the plurality of codewords.

[0007] 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 a plurality of PTRS ports and a plurality of codewords to be used for uplink communication using a plurality of antenna port groups. The memory and the one or more processors may be configured to transmit the uplink communication using the plurality of codewords based at least in part on the association.

[0008] 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 a plurality of codewords for a UE, the codewords to be used for uplink communications using a plurality of antenna port groups. The memory and the one or more processors may be configured to send a DCI identifying the transmission parameters to enable the UE to determine an association between the plurality of PTRS ports and the plurality of codewords.

[0009] In some aspects, a non-transitory computer-readable medium may store one or more instructions for wireless communication. When executed by one or more processors of a UE, the one or more instructions may cause the one or more processors to determine an association between a plurality of PTRS ports and a plurality of codewords to be used for uplink communication using a plurality of antenna port groups. The one or more instructions may cause the one or more processors to transmit the uplink communication using the plurality of codewords based at least in part on the association.

[0010] In some aspects, a non-transitory computer-readable medium may store one or more instructions for wireless communication. When executed by one or more processors of a base station, the one or more instructions may cause the one or more processors to determine transmission parameters for a plurality of codewords for a UE, the plurality of codewords to be used for uplink communication using a plurality of antenna port groups. The one or more instructions may cause the one or more processors to send a DCI identifying the transmission parameters to enable the UE to determine an association between a plurality of PTRS ports and a plurality of codewords.

[0011] In some aspects, an apparatus for wireless communication may include means for determining an association between a plurality of PTRS ports and a plurality of codewords to be used for uplink communication using a plurality of antenna port groups. The apparatus may also include means for transmitting the uplink communication using the plurality of codewords based at least in part on the association.

[0012] In some aspects, an apparatus for wireless communication may include means for determining transmission parameters for a plurality of codewords for a UE to be used for uplink communication using a plurality of antenna port groups. The apparatus may also include means for transmitting a DCI identifying the transmission parameters to enable the UE to determine an association between the plurality of PTRS ports and the plurality of codewords.

[0013] Various aspects generally include methods, apparatus, systems, computer program products, non-transitory computer-readable media, user equipment, base stations, wireless communication devices, and / or processing systems as generally described with reference to and as illustrated by the figures and description.

[0014] The foregoing has generally outlined the features and technical advantages of the examples disclosed herein so that the detailed description below may be better understood. Additional features and advantages will be described below. The disclosed concepts and specific examples may be readily used as a basis for modifying or designing other structures for achieving the same purpose of the present disclosure. Such equivalent constructions do not depart from the scope of the appended claims. The features of the concepts disclosed herein, their organization and method of operation, and associated advantages will be better understood when the following description is considered in conjunction with the accompanying drawings. Each of the figures is provided for the purpose of illustration and description and not as a definition of limitations to the claims. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order that the above-described features of the present disclosure may be understood in detail, a more particular description, briefly summarized above, may be obtained by reference to the various aspects, some of which are illustrated in the accompanying drawings. It should be noted, however, that the drawings illustrate only certain typical aspects of the present disclosure and, therefore, should not be considered limiting of the scope of the present disclosure, as the description may admit to other equally effective aspects. The same reference numerals in different drawings may identify the same or similar elements.

[0016] Figure 1 is a block diagram conceptually illustrating an example of a wireless communication network in accordance with various aspects of the present disclosure.

[0017] Figure 2 is a block diagram conceptually illustrating an example of a base station communicating with a UE in a wireless communication network in accordance with various aspects of the present disclosure.

[0018] Figure 3 is an example diagram of spatial division multiplexing according to various aspects of the present invention.

[0019] Figure 4 is a diagram illustrating an example of PTRS and demodulation reference signal (DMRS) communication according to various aspects of the present disclosure.

[0020] Figure 5 is a diagram of an example of a configuration for a PTRS port to enable uplink transmission through multiple codewords according to various aspects of the present disclosure.

[0021] Figure 6 is a diagram of example processes performed, for example, by a UE, according to various aspects of the present disclosure.

[0022] Figure 7 is a diagram of example processes performed by, for example, a BS, in accordance with various aspects of the present disclosure. DETAILED DESCRIPTION

[0023] The UE may use multiple antenna panels for uplink communications (e.g., for non-coherent joint transmission). Furthermore, the UE may use multiple codewords (e.g., two codewords) for uplink communications using multiple antenna panels, thereby improving uplink throughput. For example, the UE may use multiple transmission layers to transmit a first codeword for a first antenna panel and use multiple transmission layers to transmit a second codeword for a second antenna panel.

[0024] It may be useful for a UE to determine the PTRS configuration for multiple codewords for uplink communications. For example, it may be useful for the UE to determine the association between PTRS ports and codewords, the association between PTRS ports and antenna panels, the association between PTRS ports and DMRS ports, the PTRS density to be used for the codewords, the PTRS power boost to be used for the codewords, etc. Some techniques and apparatuses described herein provide for the PTRS configuration for multiple codewords for uplink communications.

[0025] Various aspects of the present disclosure are described more fully below with reference to the accompanying drawings. However, the present disclosure can be embodied in many different forms and should not be construed as being limited to any specific structure or function presented throughout the present disclosure. On the contrary, these aspects are provided so that the present 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, those skilled in the art will appreciate that the scope of the present disclosure is intended to encompass any aspect of the disclosure disclosed herein, whether implemented independently of any other aspect of the disclosure or implemented in combination with any other aspect of the disclosure. For example, any number of aspects set forth herein can be used to implement an apparatus or practice method. In addition, the scope of the present disclosure is intended to encompass such apparatus or methods that utilize other structures, functionalities, or structures and functionalities in addition to the various aspects of the disclosure set forth herein or in addition to the various aspects of the disclosure set forth herein. It should be understood that any aspect of the disclosure disclosed herein can be embodied by one or more elements of the claims.

[0026] Several aspects of telecommunication systems will now be presented with reference to various devices and techniques. These devices 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, etc. (collectively, "elements"). These elements can be implemented using hardware, software, or a combination thereof. Whether such elements are implemented as hardware or software depends on the specific application and the design constraints imposed on the overall system.

[0027] It should be noted that although various aspects may be described herein using terminology generally associated with 3G and / or 4G wireless technologies, various aspects of the present disclosure may be applied to other generation-based communication systems, such as 5G and newer technologies, including NR technologies.

[0028] Figure 1 is a diagram illustrating a wireless network 100 in which various aspects of the present disclosure may be practiced. The wireless network 100 may be an LTE network or some other wireless network, such as a 5G or NR network. The wireless network 100 may include multiple 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 a user equipment (UE) and may also be referred to as a base station, NR BS, Node B, gNB, 5G Node B (NB), access point, transmit receive point (TRP), etc. Each BS may provide communication coverage for a specific geographic area. In 3GPP, the term "cell" may refer to the coverage area of ​​a BS and / or a BS subsystem serving that coverage area, depending on the context in which the term is used.

[0029] 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., a radius of several kilometers) and may allow unrestricted access by UEs with a service subscription. A pico cell may cover a relatively small geographic area and may allow unrestricted access by UEs with a service subscription. A femto cell may cover a relatively small geographic area (e.g., a home) and may allow restricted access by UEs associated 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 Figure 1 In the example shown in FIG, BS 110a may be a macro BS for macrocell 102a, BS 110b may be a pico BS for picocell 102b, and BS 110c may be a femto BS for femtocell 102c. A BS may support one or more (e.g., three) cells. The terms "eNB," "base station," "NRBS," "gNB," "TRP," "AP," "Node B," "5G NB," and "cell" may be used interchangeably herein.

[0030] In some aspects, the cells may not necessarily be stationary, and the geographic area of ​​the cells may move depending on the location of the mobile BS. In some aspects, the BSs may be interconnected to each other and / or to one or more other BSs or network nodes (not shown) in the wireless network 100 via various types of backhaul interfaces (such as direct physical connections, virtual networks, etc.) using any suitable transport network.

[0031] The wireless network 100 may also include a relay station. A relay station is an entity that can receive transmissions of data from an upstream station (e.g., a BS or UE) and send transmissions of data to a downstream station (e.g., a UE or BS). A relay station may also be a UE that can relay transmissions of other UEs. Figure 1 In the example shown in FIG, a relay station 110d may communicate with a macro BS 110a and a UE 120d to facilitate communication between the BS 110a and the UE 120d. A relay station may also be referred to as a relay BS, a relay base station, a relay, or the like.

[0032] The wireless network 100 may be a heterogeneous network including different types of BSs (e.g., macro BSs, pico BSs, femto BSs, relay BSs, etc.). These different types of BSs may have different transmit power levels, different coverage areas, and different impacts on interference in the wireless network 100. For example, a macro BS may have a high transmit power level (e.g., 5 watts to 40 watts), while a pico BS, a femto BS, and a relay BS may have a lower transmit power level (e.g., 0.1 watt to 2 watts).

[0033] The network controller 130 may be coupled to a set of BSs and may provide coordination and control for these BSs. The network controller 130 may communicate with the BSs via a backhaul. The BSs may also communicate with each other directly or indirectly, for example, via a wireless or wired backhaul.

[0034] UEs 120 (e.g., 120a, 120b, 120c) may be dispersed throughout the wireless network 100, and each UE may be stationary or mobile. A UE may also be referred to as an access terminal, terminal, mobile station, subscriber unit, station, etc. A UE may be a cellular phone (e.g., a smartphone), 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 computer, a camera, a gaming device, a netbook, a smartbook, an ultrabook, a medical device or equipment, a biometric sensor / device, a wearable device (e.g., a smart watch, smart clothing, smart glasses, a smart wristband, smart jewelry (e.g., a smart ring, a smart bracelet)), an entertainment device (e.g., a music or video device or a satellite radio), an in-vehicle component or sensor, a smart meter / sensor, industrial manufacturing equipment, a global positioning system device, or any other suitable device configured to communicate via a wireless or wired medium.

[0035] 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, etc. that can communicate with a base station, another device (e.g., a remote device), or some other entity. A wireless node may provide connectivity to or with a network (e.g., a wide area network such as the Internet or a cellular network) via, for example, a wired or wireless communication link. Some UEs may be considered Internet of Things (IoT) devices and / or may be implemented as NB-IoT (Narrowband Internet of Things) devices. Some UEs may be considered customer premises equipment (CPE). The UE 120 may be included inside a housing that houses components of the UE 120 (e.g., a processor component, a memory component, etc.).

[0036] In general, any number of wireless networks can be deployed in a given geographic area. Each wireless network can support a specific radio access technology (RAT) and can operate at one or more frequencies. RAT can also be referred to as radio technology, air interface, etc. Frequency can also be referred to as carrier, frequency channel, etc. Each frequency can support a single RAT in a given geographic area to avoid interference between wireless networks of different RATs. In some cases, NR or 5G RAT networks can be deployed.

[0037] like Figure 1 As shown, UE 120 may include a communication manager 140. As described in more detail elsewhere herein, the communication manager 140 may determine an association between a plurality of PTRS ports and a plurality of codewords to be used for uplink communications using a plurality of antenna port groups, send uplink communications using the plurality of codewords based at least in part on the association, etc. Additionally or alternatively, the communication manager 140 may perform one or more other operations described herein.

[0038] Similarly, base station 110 may include a communication manager 150. As described in more detail elsewhere herein, communication manager 150 may determine transmission parameters for multiple codewords to be used for uplink communications for a UE using multiple antenna port groups, send DCI identifying the transmission parameters to enable the UE to determine an association between multiple PTRS ports and multiple codewords, etc. Additionally or alternatively, communication manager 150 may perform one or more other operations described herein.

[0039] As indicated above, provide Figure 1 This is just an example. Other examples can be found in Figure 1 What is described is different.

[0040] Figure 2A block diagram shows a design 200 of a base station 110 and a UE 120, which may be Figure 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.

[0041] At the 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 a channel quality indicator (CQI) received from the UE, process (e.g., encode and modulate) the data for each UE based at least in part on the MCS selected for the UE, and provide data symbols for all UEs. The transmit processor 220 may also process system information (e.g., for semi-static resource partitioning information (SRPI) and control information (e.g., CQI requests, grants, upper layer signaling, etc.) and provide overhead symbols and control symbols. The transmit processor 220 may also generate reference symbols for reference signals (e.g., cell-specific reference signals (CRS)) and synchronization signals (e.g., primary synchronization signals (PSS) and secondary synchronization signals (SSS)). If applicable, the transmit (TX) multiple-input multiple-output (MIMO) processor 230 may perform spatial processing (e.g., precoding) on ​​the data symbols, control symbols, overhead symbols, and / or reference symbols, and may provide T output symbol streams to T modulators (MODs) 232a through 232t. Each modulator 232 may process a corresponding output symbol stream (e.g., for OFDM, etc.) 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. The 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, position coding may be used to generate synchronization signals to convey additional information.

[0042] At UE 120, antennas 252a through 252r may receive 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) the received signal to obtain input samples. Each demodulator 254 may further process the input samples (e.g., for OFDM, etc.) 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. The channel processor may determine reference signal received power (RSRP), received signal strength indicator (RSSI), reference signal received quality (RSRQ), channel quality indicator (CQI), etc. In some aspects, one or more components of UE 120 may be included in a housing.

[0043] On the uplink, at the UE 120, a transmit processor 264 may receive and process data from a data source 262 and control information from a controller / processor 280 (e.g., for reports including RSRP, RSSI, RSRQ, CQI, etc.). The transmit processor 264 may also generate reference symbols for one or more reference signals. The symbols from the 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, etc.), and transmitted to the base station 110. At the base station 110, uplink signals from the UE 120 and other UEs may be received by the antennas 234, processed by the demodulators 232, detected by the MIMO detector 236 (if applicable), and further processed by the receive processor 238 to obtain 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 communicate with the network controller 130 via the communication unit 244. The network controller 130 may include a communication unit 294, a controller / processor 290, and a memory 292.

[0044] The controller / processor 240 of the base station 110, the controller / processor 280 of the UE 120, and / or Figure 2Any other component of the UE 120 may perform one or more techniques associated with PTRS port configuration to enable uplink transmission with multiple codewords, 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, and / or Figure 2 Any other component may perform or direct e.g. Figure 6 The process of 600 Figure 7 The operations of process 700 and / or other processes as described herein may be performed. Memories 242 and 282 may store data and program codes for base station 110 and UE 120, respectively. Scheduler 246 may schedule UEs for data transmission on the downlink and / or uplink.

[0045] In some aspects, the UE 120 may include means for determining an association between a plurality of PTRS ports and a plurality of codewords to be used for uplink communications using a plurality of antenna port groups, means for transmitting uplink communications using the plurality of codewords based at least in part on the association, etc. 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 means for combining Figure 2 One or more components of UE 120 are described.

[0046] In some aspects, base station 110 may include: means for determining transmission parameters for a plurality of codewords for a UE, the plurality of codewords to be used for uplink communications using a plurality of antenna port groups; means for sending a DCI identifying the transmission parameters to enable the UE to determine an association between the plurality of PTRS ports and the plurality of codewords; and / or the like. Additionally or alternatively, base station 110 may include means for performing one or more other operations described herein. In some aspects, such means may include communications manager 150. In some aspects, such means may include in conjunction with Figure 2 One or more components of base station 110 are described.

[0047] As indicated above, provide Figure 2 This is just an example. Other examples can be found in Figure 2 What is described is different.

[0048] Figure 3is a diagram illustrating an example of spatial division multiplexing according to various aspects of the present disclosure. Specifically, reference numeral 305 illustrates 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), the UE may transmit the first PUSCH transmission 310 and the second PUSCH transmission 315 in the same time and frequency resources, as scheduled by a single DCI.

[0049] In some aspects, a UE may send a first PUSCH transmission 310 using a first antenna panel of the UE and a second PUSCH transmission 315 using a second antenna panel of the UE. In other words, the UE may form a first beam on a first antenna panel using a first precoding and a second beam on a second antenna panel using a second precoding. For non-coherent joint transmission, the precoding (P) may be determined by Indicates that represents the precoder of the first layer of the first antenna panel (A), In some aspects, the UE may transmit uplink communications based at least in part on a dynamic panel selection using a precoder that may be selected by or In some aspects, a UE may transmit uplink communications using a single antenna panel with precoding, which may be represented by P = [v1v2…v L ] to represent, where v L represents the precoder of layer L.

[0050] As shown by reference numeral 320, a first PUSCH transmission (PUSCH 1) may be associated with a first plurality of transmission layers (shown as layer group 1), and a second PUSCH transmission (PUSCH 2) may be associated with a second plurality of transmission layers (shown as layer group 2). Furthermore, the first group of layers (e.g., for MIMO transmission) may be associated with a first codeword (shown as codeword 1), and the second group of layers (e.g., for MIMO transmission) may be associated with a second codeword (shown as codeword 2). The first codeword and the second codeword may be transport blocks.

[0051] As mentioned above, Figure 3 are provided as examples. Other examples may differ from those described in Figure 3 described.

[0052] Figure 4 is a diagram illustrating an example of PTRS and DMRS communication according to various aspects of the present disclosure. Specifically, Figure 4The transmission of PTRS and DMRS in one time slot (e.g., 14 OFDM symbols in the time domain) is shown. For example, the UE can send PTRS in the layer mapped to a specific DMRS port. Figure 4 As shown, the first PTRS port (shown as port 1), the second PTRS port (shown as port 2), the third PTRS port (shown as port 3), and the fourth PTRS port (shown as port 4) can be orthogonal (e.g., can occupy different resource elements in frequency).

[0053] PTRS can be used to correct phase noise (e.g., oscillator phase noise) and is particularly suitable for millimeter wave communications. In a non-codebook based uplink, the UE may identify one or more PTRS ports based at least in part on a sounding reference signal (SRS) resource indicator (SRI) for uplink communications. For example, the SRI may identify one or more multiple SRS resources, and each SRS resource may be configured with a specific PTRS port. In a codebook based uplink, the UE may identify one or more PTRS ports based at least in part on a transmit precoding matrix indicator (TPMI) and the number of layers of the indicated uplink communication.

[0054] As described above, a UE may use multiple antenna panels for uplink communications (e.g., for non-coherent joint transmission). In some aspects, the antenna panels used for uplink communications may be referred to as PUSCH antenna port groups (or antenna port groups). Furthermore, as described above, a UE may use multiple codewords (e.g., two codewords) for uplink communications using multiple antenna panels, thereby improving uplink throughput. For example, a UE may use multiple transmission layers to transmit a first codeword for a first antenna port group and use multiple transmission layers to transmit a second codeword for a second antenna port group.

[0055] It may be useful for a UE to determine a PTRS configuration for multiple codewords for uplink communication. For example, it may be useful for the UE to determine an association between a PTRS port and a codeword, an association between a PTRS port and an antenna port subgroup, an association between a PTRS port and a DMRS port (which may be referred to herein as a PTRS-DMRS association), a PTRS density to be used for a codeword, a PTRS power boost to be used for a codeword, etc. Some techniques and apparatuses described herein provide for PTRS configuration for multiple codewords for uplink communication.

[0056] As mentioned above, Figure 4 are provided as examples. Other examples may differ from those described in Figure 4 described.

[0057] Figure 55 is a diagram illustrating an example 500 of a configuration of a PTRS port for enabling uplink transmission over multiple codewords according to various aspects of the present disclosure. Figure 5 As shown, UE 120 and BS 110 can communicate with each other. In some aspects, UE 120 can use multiple transmit antenna panels (e.g., multiple PUSCH antenna port groups). For example, UE 120 can transmit a first codeword in multiple transmission layers using a first antenna port group and transmit a second codeword in multiple transmission layers using a second antenna port group. In some aspects, the first codeword can be associated with a first index value (e.g., codeword 0) and the second codeword can be associated with a second index value (e.g., codeword 1).

[0058] As indicated by reference numeral 505, BS 110 may transmit, and UE 120 may receive, DCI that schedules uplink communications for UE 120. For example, the DCI may schedule multi-panel uplink communications for UE 120, such as a first PUSCH transmission (e.g., multiple layers) on a first antenna panel of UE 120 and a second PUSCH transmission (e.g., multiple layers) on a second antenna panel of UE 120. As described below, the DCI may enable UE 120 to determine an association between a PTRS port and multiple codewords. In some aspects, UE 120 may receive the DCI from a first TRP (e.g., associated with BS 110), and the DCI may schedule uplink multi-panel communications to the first TRP and a second TRP (e.g., associated with BS 110 or another BS).

[0059] In some aspects, the DCI may identify transmission parameters for uplink communications of UE 120. For example, BS 110 may determine transmission parameters for multiple codewords (e.g., two codewords) for UE 120, and the DCI may identify the determined transmission parameters. Thus, the transmission parameters indicated by the DCI may include a first set of transmission parameters for a first PUSCH transmission of UE 120, and a second set of transmission parameters for a second PUSCH transmission of UE 120.

[0060] The transmission parameters may include one or more precoding indicators, such as one or more TPMIs (e.g., for codebook-based uplink) or one or more SRIs (e.g., for non-codebook-based uplink). For example, the transmission parameters may include a first precoding indicator for a first PUSCH transmission and a second precoding indicator for a second PUSCH transmission. The precoding indicator may identify a number of transmission layers to be transmitted using one or more antenna port subsets of an antenna port group (e.g., the precoding indicator may identify a precoder matrix).

[0061] 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 a first PUSCH transmission and a second beam identifier for a second PUSCH transmission. The TCI may indicate a TCI state associated with a beam, which 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. Thus, the UE 120 may transmit a PUSCH transmission using a beam or spatial filter corresponding to a beam or spatial filter used for a reference signal associated with the TCI state indicated for the PUSCH transmission.

[0062] The transmission parameters may include one or more DMRS identifiers (e.g., one or more DMRS port indicators, DMRS code division multiplexing (CDM) group identifiers, etc.). For example, the transmission parameters may include a single DMRS identifier that identifies the DMRS port for the first PUSCH transmission and the second PUSCH transmission. The DMRS identifier may identify a DMRS port associated with multiple (e.g., at least two) CDM groups. Thus, the first codeword of the first PUSCH transmission may be associated with the first uplink precoding indicator (e.g., the first TPMI) and the first DMRS group, and the second codeword of the second PUSCH transmission may be associated with the second uplink precoding indicator (e.g., the second TPMI) and the second DMRS group.

[0063] The transmission parameters may include one or more MCS identifiers. For example, the transmission parameters may include a first MCS identifier for a first PUSCH transmission and a second MCS identifier for a second PUSCH transmission. The transmission parameters may include one or more bandwidth identifiers (e.g., one or more bandwidth part identifiers). For example, the transmission parameters may include a first bandwidth identifier for a first PUSCH transmission and a second bandwidth identifier for a second PUSCH transmission. In some aspects, the bandwidth (e.g., bandwidth part) to be used for the first PUSCH transmission and the second PUSCH transmission is the same (e.g., the first bandwidth identifier and the second bandwidth identifier are the same).

[0064] In some aspects, the transmission parameters may identify one or more maximum numbers of PTRS ports (e.g., one or more maxNrofPorts parameters). For example, the transmission parameters may identify a first maximum number of PTRS ports (e.g., maxNrofPorts1) for a first codeword (e.g., for a first PUSCH transmission) and a second maximum number of PTRS ports (e.g., maxNrofPorts2) for a second codeword (e.g., for a second PUSCH transmission). In some aspects, the maximum number of PTRS ports for a codeword may be one PTRS port or more than one PTRS port (e.g., two PTRS ports). In some aspects, the UE 120 may be configured with a total of four PTRS ports (one or more of which may be associated with the first codeword and one or more of which may be associated with the second codeword), and the four PTRS ports may be orthogonal in frequency (e.g., in combination with Figure 4 described).

[0065] In some aspects, BS 110 may determine the maximum number of PTRS ports for a codeword based at least in part on a UE capability report regarding a codebook type. For example, UE 120 may transmit one or more capability reports reporting a first codebook subset type for a first antenna port group used by UE 120 (e.g., associated with a first codeword) and a second codebook subset type for a second antenna port group used by UE 120 (e.g., associated with a second codeword). The codebook subset type reported by UE 120 may be non-coherent; partially coherent and non-coherent (which may be referred to as partial / non-coherent); or fully coherent, partially coherent, and non-coherent (which may be referred to as full / partial / non-coherent).

[0066] BS 110 may determine a first maximum number of PTRS ports for a first codeword based at least in part on a first codebook subset type reported for a first antenna port group, and may determine a second maximum number of PTRS ports for a second codeword based at least in part on a second codebook subset type reported for a second antenna port group. When the codebook subset type reported for a codeword is full / partial / non-coherent, the maximum number of PTRS ports for the codeword may be one PTRS port. When the codebook subset type reported for a codeword is non-coherent or partial / non-coherent, the maximum number of PTRS ports for the codeword may be more than one PTRS port (e.g., two PTRS ports).

[0067] As shown by reference numeral 510, UE 120 may determine a PTRS configuration for multiple codewords (e.g., two codewords). For example, UE 120 may determine a first PTRS configuration for a first codeword to be transmitted using a first antenna port group (e.g., a first PUSCH transmission), and a second PTRS configuration for a second codeword to be transmitted using a second antenna port group (e.g., a second PUSCH transmission). The PTRS configuration for the multiple codewords may be based at least in part on transmission parameters identified by the DCI.

[0068] In some aspects, UE 120 may determine an association between a PTRS port and a plurality of codewords. For example, UE 120 may determine that one or more PTRS ports in a first set of PTRS ports (e.g., PTRS ports 0 and 1) are to be associated with a first codeword, and one or more PTRS ports in a second set of PTRS ports (e.g., PTRS ports 2 and 3) are to be associated with a second codeword (e.g., based on a maximum number of PTRS ports for each of the first and second codewords).

[0069] In some aspects, UE 120 may determine the PTRS ports to be associated with the multiple codewords based at least in part on the respective antenna port groups associated with the multiple codewords. As described above, a first codeword may be associated with a first antenna port group, and a second codeword may be associated with a second antenna port group. Furthermore, the first antenna port group may include first and second antenna port subgroups, and the second antenna port group may include first and second antenna port subgroups. For example, the first antenna port group may include antennas 0, 1, 2, and 3, the first antenna port subgroup of the first antenna port group may include antennas 0 and 2, and the second antenna port subgroup of the first antenna port group may include antennas 1 and 3.

[0070] In one example, if the maximum number of PTRS ports for a codeword is greater than one PTRS port (e.g., two PTRS ports), a group of PTRS ports may be associated with antenna port subgroups of the antenna port group associated with the codeword, respectively. That is, a first PTRS port may be associated with a first antenna port subgroup of the antenna port group, and a second PTRS port may be associated with a second antenna port subgroup of the antenna port group.

[0071] For example, if the maximum number of PTRS ports for the first codeword (e.g., maxNrofPorts1) is two PTRS ports (e.g., for a partial / incoherent or incoherent codebook subset type), the first PTRS port (e.g., PTRS port 0) may be associated with the first antenna port subgroup of the first antenna port group, and the second PTRS port (e.g., PTRS port 1) may be associated with the second antenna port subgroup of the first antenna port group. Similarly, if the maximum number of PTRS ports for the second codeword (e.g., maxNrofPorts2) is two PTRS ports (e.g., for a partial / incoherent or incoherent codebook subset type), the third PTRS port (e.g., PTRS port 2) may be associated with the first antenna port subgroup of the second antenna port group, and the fourth PTRS port (e.g., PTRS port 3) may be associated with the second antenna port subgroup of the second antenna port group.

[0072] In one example, if the maximum number of PTRS ports for a codeword is one PTRS port, a single PTRS port may be associated with multiple antenna port subgroups of an antenna port group associated with the codeword. That is, a single PTRS port may be associated with a first antenna port subgroup and a second antenna port subgroup of an antenna port group. For example, if the maximum number of PTRS ports for a first codeword (e.g., maxNrofPorts1) is one PTRS port, a first PTRS port (e.g., PTRS port 0) may be associated with a first antenna port subgroup and a second antenna port subgroup of the first antenna port group. Similarly, if the maximum number of PTRS ports for a second codeword (e.g., maxNrofPorts2) is one PTRS port, a third PTRS port (e.g., PTRS port 2) may be associated with a first antenna port subgroup and a second antenna port subgroup of the second antenna port group.

[0073] In some aspects, UE 120 may determine the actual number of PTRS ports to be associated with a codeword (e.g., when the codeword is to be transmitted in two, three, or four layers) based at least in part on a precoding indicator (e.g., TPMI or SRI) identified in the DCI. For example, if the maximum number of PTRS ports to be associated with the codeword is more than one PTRS port (e.g., two PTRS ports), then when the precoding indicator (e.g., a precoder matrix indicated by the precoding indicator) indicates a precoder for a first antenna port subgroup and a second antenna port subgroup of the antenna port group associated with the codeword, multiple PTRS ports (e.g., two PTRS ports) may be associated with the codeword.

[0074] As another example, if the maximum number of PTRS ports to be associated with a codeword is more than one PTRS port (e.g., two PTRS ports), then when the precoding indicator (e.g., the precoder matrix indicated by the precoding indicator) indicates a precoder for only one of the first antenna port subgroup or the second antenna port subgroup of the antenna port group associated with the codeword, only a single PTRS port can be associated with the codeword. As another example, if the maximum number of PTRS ports to be associated with a codeword is one PTRS port, then only a single PTRS port can be associated with the codeword.

[0075] In some aspects, UE 120 may determine a PTRS-DMRS association based at least in part on the actual number of PTRS ports determined for the codeword. That is, UE 120 may determine a mapping of DMRS ports associated with the codeword to PTRS ports. Thus, UE 120 may use the precoding for the PTRS port that is used for the layer identified by the precoding indicator of the codeword (the layer associated with the DMRS port).

[0076] In some aspects, the UE 120 may determine the PTRS-DMRS association (e.g., for codebook-based MIMO) based at least in part on an indication in the DCI. In one example, the actual number of PTRS ports associated with the codeword is one PTRS port, and the PTRS port may be shared by two layers that use the same antenna port subset of the antenna port group associated with the codeword (e.g., as indicated by a precoding indicator associated with the codeword). In this example, for the codeword, a single bit of the PTRS-DMRS association field of the DCI may indicate one of the two layers (e.g., the PTRS port is mapped to the DMRS port associated with the indicated layer).

[0077] For example, the first bit in the PTRS-DMRS Association field for a first codeword may have a value of zero to indicate that the first of two DMRS ports (e.g., two DMRS ports respectively associated with two layers shared by the PTRS port) is to be associated with the PTRS port of the first codeword. Alternatively, the first bit may have a value of 1 to indicate that the second of the two DMRS ports is to be associated with the PTRS port of the first codeword. Similarly, the second bit in the PTRS-DMRS Association field for a second codeword may have a value of zero to indicate that the first of two DMRS ports (e.g., two DMRS ports respectively associated with two layers shared by the PTRS port) is to be associated with the PTRS port for the second codeword. Alternatively, the second bit may have a value of 1 to indicate that the second of the two DMRS ports is to be associated with the PTRS port of the second codeword.

[0078] In another example, the actual number of PTRS ports associated with a codeword is one or two PTRS ports, and the PTRS ports may be shared by more than two layers (e.g., four layers), for example, when the codeword may be transmitted using more than two layers (e.g., using four layers). In this example, two bits of the PTRS-DMRS association field of the DCI may indicate a mapping of PTRS ports to layers (e.g., DMRS ports associated with a layer), as described in 3GPP Release 15. For example, each bit of the PTRS-DMRS association field may indicate an index value identifying a mapping of a PTRS-DMRS association.

[0079] In some aspects, the UE 120 may use a one-to-one mapping to determine the PTRS-DMRS association. When the actual number of PTRS ports associated with the codeword corresponds to the number of layers using different antenna port subsets of the antenna port group associated with the codeword (e.g., as indicated by a precoding indicator associated with the codeword), the UE 120 may use the one-to-one mapping to determine the PTRS-DMRS association. Furthermore, when using the one-to-one mapping, one or more bits in the PTRS-DMRS field of the DCI may be reserved.

[0080] In some aspects, the actual number of PTRS ports associated with a codeword may be two PTRS ports, and the codeword may be transmitted using two layers that use different antenna port subsets. In this example, the PTRS ports and layers (e.g., the respective DMRS ports associated with the layers) may be mapped one-to-one in sequence (e.g., the lowest-indexed PTRS port may be associated with the lowest-indexed layer, and the highest-indexed PTRS port may be associated with the highest-indexed layer). In some aspects, the actual number of PTRS ports associated with a codeword may be one PTRS port, and the codeword may be transmitted using one layer. In this example, the PTRS ports and layers (e.g., the DMRS ports associated with the layers) may be mapped one-to-one.

[0081] In some aspects, UE 120 may determine a PTRS density for one or more PTRS ports associated with a codeword.In some aspects, UE 120 may determine a temporal density of PTRS ports based at least in part on one or more MCSs identified in a DCI.

[0082] In some aspects, UE 120 may determine a common time density to be used for PTRS ports associated with multiple codewords based at least in part on the highest MCS indicated for the multiple codewords in the DCI. For example, the DCI may indicate a first MCS for a first codeword and a second MCS for a second codeword. The highest MCS may be the MCS indicated by the highest MCS identifier (e.g., the highest index value) in the DCI. UE 120 may determine the time density based at least in part on the highest MCS using a table that associates MCS values ​​with time density values ​​(e.g., Table 6.2.3.1-1 of 3GPP Technical Specification 38.214).

[0083] In some aspects, UE 120 may use an MCS indicated in a DCI for a codeword to determine a time density of one or more PTRS ports associated with the codeword. For example, UE 120 may determine a first time density of one or more PTRS ports associated with the first codeword based at least in part on a first MCS indicated for the first codeword, and may determine a second time density of one or more PTRS ports associated with the second codeword based at least in part on a second MCS indicated for the second codeword. As described above, UE 120 may determine the time density based at least in part on the MCS using a table that associates MCS values ​​with time density values.

[0084] In some aspects, the UE 120 may determine the frequency density of the PTRS ports based at least in part on the bandwidth (e.g., bandwidth portion) identified in the DCI. As described above, the DCI may indicate the same bandwidth (e.g., the same bandwidth portion) for multiple codewords (e.g., a first bandwidth indicated for a first codeword may be the same as a second bandwidth indicated for a second codeword). Thus, the UE 120 may determine, based at least in part on the indicated bandwidth, a common frequency density to be used for one or more PTRS ports associated with the first codeword and one or more PTRS ports associated with the second codeword. The UE 120 may determine the frequency density based at least in part on the indicated bandwidth using a table that associates bandwidth values ​​with frequency density values ​​(e.g., Table 6.2.3.1-2 of 3GPP Technical Specification 38.214).

[0085] In some aspects, the UE 120 may determine a power boost (PB) for a PTRS port associated with a codeword. The power boost may be based at least in part on the number of layers (e.g., as indicated by a precoder matrix) (X) to be used to transmit the codeword, the total number of PTRS ports associated with the multiple codewords (e.g., the number of muted frequency resource elements associated with the multiple codewords) (Y), the coherence type associated with the precoding indicator (e.g., TPMI or SRI) of the codeword, the codebook subset type reported by the UE 120, etc. In some aspects, the power boost for PTRS relative to PUSCH may be expressed as PB = 10·log 10 (X·Y).

[0086] In some aspects, with respect to the PTRS of a codeword, when a precoding indicator (e.g., TPMI) for the codeword is associated with partial coherence or non-coherence (e.g., when the number of layers scheduled for the codeword reaches two layers), X may have a value of 1. In some aspects, with respect to the PTRS of a codeword, when a precoding indicator (e.g., TPMI) for the codeword is associated with non-coherence, X may have a value of 1, and a capability report sent by the UE 120 indicates a full / partial / non-coherent codebook subset type for the codeword (e.g., when the number of layers scheduled for the codeword reaches four layers, such as three or four layers).

[0087] In some aspects, with respect to the PTRS of a codeword, when the precoding indicator (e.g., TPMI) of the codeword is associated with perfect coherence, X may have a value corresponding to the number of layers to be used to transmit the codeword (e.g., as indicated by the TPMI of the codeword). In some aspects, with respect to the PTRS of codeword i, X may be represented as (where Li represents the number of layers scheduled for codeword i, and the sign corresponds to +1 if Li-3 is a positive value, or to -1 if Li-3 is a negative value), when the precoding indicator (e.g., TPMI) of the codeword is associated with partial coherence, and the capability report sent by UE 120 indicates a partial / non-coherent codebook subset type for the codeword (e.g., when the number of layers scheduled for the codeword is more than two, such as three or four layers). For example, if Li is greater than 3, X is 2, and if Li is less than or equal to 3, X is 1.

[0088] In some aspects, the value of Y may be expressed as Y=Qp0+Qp1, where Qp0 corresponds to the actual number of PTRS ports associated with the first codeword and Qp1 corresponds to the actual number of PTRS ports associated with the second codeword.

[0089] In some aspects, the ratio of the power used by the UE 120 for PUSCH to the power used by the UE 120 for PTRS It can be expressed as The values ​​are shown in Table 1:

[0090]

[0091] Table 1

[0092] Wherein, UL-PTRS-power represents the value of the higher layer PTRS power parameter configured for UE 120, and represents the number of layers to be used to transmit codeword i (eg, for transmitting PUSCH using codeword i).

[0093] Table 2 shows the power boost values ​​of one codeword (CW0) relative to another codeword (CW1) for various combinations of transmission layers associated with fully coherent (F), partially coherent (P), or non-coherent (N). In Table 2, the values ​​are shown in the format (Q1, Q2, X·Y), where Q1 represents the number of PTRS ports associated with CW0 (e.g., Qp0), Q2 represents the number of PTRS ports associated with CW1 (e.g., Qp1), and X·Y is for CW0, as described above:

[0094]

[0095]

[0096] Table 2

[0097] In some aspects, CW0 may be one of the first codeword or the second codeword, and CW1 may be the other of the first codeword or the second codeword.

[0098] As indicated by reference numeral 515, UE 120 may communicate with BS 110 using multiple antenna panels based at least in part on the determined PTRS configuration. For example, UE 120 may transmit multi-panel uplink communications based at least in part on the determined PTRS configuration. For example, UE 120 may transmit a first PUSCH transmission (e.g., one or more PTRS associated with a first codeword, and a first codeword) using a first antenna port group (e.g., using a first beam) and a second PUSCH transmission (e.g., one or more PTRS associated with a second codeword, and a second codeword) using a second antenna port group (e.g., using a second beam). In some aspects, UE 120 may transmit the first PUSCH transmission to a first TRP (e.g., associated with BS 110) and the second PUSCH transmission to a second TRP (e.g., associated with BS 110 or another BS).

[0099] As mentioned above, Figure 5 are provided as examples. Other examples may differ from those described in Figure 5 described.

[0100] Figure 6 An example process 600 is shown, for example, performed by a UE, in accordance with various aspects of the present disclosure. Example process 600 is an example of a UE (eg, UE 120, etc.) performing operations associated with configuring a PTRS port to enable uplink transmission over multiple codewords.

[0101] like Figure 6 As shown, in some aspects, process 600 may include determining an association between a plurality of PTRS ports and a plurality of codewords to be used for uplink communications using a plurality of antenna port groups (block 610). For example, as described above, a UE (e.g., using controller / processor 280, etc.) may determine an association between a plurality of PTRS ports and a plurality of codewords to be used for uplink communications using a plurality of antenna port groups.

[0102] like Figure 6 As further shown in FIG6 , in some aspects, process 600 may include transmitting uplink communications using multiple codewords based at least in part on the association (block 620). For example, as described above, the UE (e.g., using controller / processor 280, transmit processor 264, TX MIMO processor 266, MOD 254, antenna 252, etc.) may transmit uplink communications using multiple codewords based at least in part on the association.

[0103] Process 600 may include additional aspects, such as any single aspect or any combination of aspects described below, and / or be combined with one or more other processes described elsewhere herein.

[0104] In a first aspect, a maximum number of PTRS ports to be associated with a codeword is based at least in part on a capability report sent by the UE for a codebook type for an antenna port group associated with the codeword.

[0105] In a second aspect, alone or in combination with the first aspect, more than one PTRS port is associated with a codeword, a first PTRS port is associated with a first antenna port subset of the antenna port group, and a second PTRS port is associated with a second antenna port subset of the antenna port group.

[0106] In a third aspect, alone or in combination with one or more of the first and second aspects, only a single PTRS port will be associated with a codeword, and the single PTRS port will be associated with the first and second antenna port subgroups of the antenna port group.

[0107] In a fourth aspect, alone or in combination with one or more of the first to third aspects, the number of PTRS ports associated with a codeword is based at least in part on a precoding indicator indicated for the codeword.

[0108] In a fifth aspect, alone or in combination with one or more of the first to fourth aspects, multiple PTRS ports are associated with a codeword when a precoding indicator indicates a precoder for a first antenna port subgroup and a second antenna port subgroup of the antenna port group associated with the codeword, and the maximum number of PTRS ports associated with the codeword is greater than one PTRS port.

[0109] In a sixth aspect, alone or in combination with one or more of the first to fifth aspects, when the precoding indicator indicates a precoder of one of the first antenna port subgroup or the second antenna port subgroup of the antenna port group associated with the codeword, and the maximum number of PTRS ports associated with the codeword is greater than one PTRS port, only a single PTRS port is associated with the codeword.

[0110] In a seventh aspect, alone or in combination with one or more of the first to sixth aspects, when the maximum number of PTRS ports associated with the codeword is one PTRS port, only a single PTRS port is associated with the codeword.

[0111] In an eighth aspect, alone or in combination with one or more of the first to seventh aspects, process 600 includes determining a mapping of a DMRS port to a PTRS port associated with a codeword, and the PTRS port will use the same precoding as the layer associated with the DMRS port identified by the precoding indicator indicated for the codeword.

[0112] In a ninth aspect, alone or in combination with one or more of the first to eighth aspects, when only a single PTRS port is associated with the codeword and the precoding indicator identifies precoders for multiple layers using the same antenna port subset of the antenna port group associated with the codeword, the mapping is based at least in part on an indication in the downlink control information.

[0113] In the tenth aspect, alone or in combination with one or more of the first to ninth aspects, the mapping is a one-to-one mapping when the number of PTRS ports associated with the codeword corresponds to the number of layers identified by the precoding indicator that use different antenna port subgroups of the antenna port group associated with the codeword.

[0114] In an eleventh aspect, alone or in combination with one or more of the first to tenth aspects, process 600 includes determining a temporal density of a plurality of PTRS ports associated with the plurality of codewords based at least in part on a highest MCS indicated for the plurality of codewords.

[0115] In a twelfth aspect, alone or in combination with one or more of the first to eleventh aspects, process 600 includes determining a temporal density of one or more PTRS ports associated with a codeword based at least in part on an MCS indicated for the codeword.

[0116] In a thirteenth aspect, alone or in combination with one or more of the first to twelfth aspects, process 600 includes determining a frequency density of a plurality of PTRS ports associated with the plurality of codewords based at least in part on bandwidths associated with the plurality of codewords.

[0117] In a fourteenth aspect, alone or in combination with one or more of the first to thirteenth aspects, process 600 includes determining a power boost for a PTRS port associated with a codeword based at least in part on a number of layers identified by a precoding indicator of the codeword and a total number of PTRS ports associated with the plurality of codewords.

[0118] although Figure 6 Example blocks of process 600 are shown, but in some aspects, process 600 may include Figure 6 More blocks, fewer blocks, different blocks, or a different arrangement of blocks than shown. Additionally or alternatively, two or more blocks of process 600 can be executed in parallel.

[0119] Figure 7 An example process 700, such as performed by a base station, is shown in accordance with various aspects of the present disclosure. Example process 700 is an example of a base station (eg, base station 110, etc.) performing operations associated with configuring PTRS ports to enable uplink transmission over multiple codewords.

[0120] like Figure 7 As shown, in some aspects, process 700 may include determining transmission parameters for a plurality of codewords for a UE to be used for uplink communications using a plurality of antenna port groups (block 710). For example, as described above, a base station (e.g., using controller / processor 240, etc.) may determine transmission parameters for a plurality of codewords for a UE to be used for uplink communications using a plurality of antenna port groups.

[0121] like Figure 7 As further shown in FIG, in some aspects, process 700 may include transmitting DCI identifying transmission parameters to enable a UE to determine an association between multiple PTRS ports and multiple codewords (block 720). For example, a base station (e.g., using controller / processor 240, transmit processor 220, TX MIMO processor 230, MOD 232, antenna 234, etc.) may transmit DCI identifying transmission parameters to enable a UE to determine an association between multiple PTRS ports and multiple codewords, as described above.

[0122] Process 700 may include additional aspects, such as any single aspect or any combination of aspects described below, and / or be combined with one or more other processes described elsewhere herein.

[0123] In a first aspect, process 700 includes determining a maximum number of PTRS ports to be associated with a codeword based at least in part on a capability report for a codebook type sent by a UE for a group of antenna ports associated with the codeword.

[0124] In a second aspect, alone or in combination with the first aspect, more than one PTRS port is associated with a codeword, a first PTRS port is associated with a first antenna port subset of the antenna port group, and a second PTRS port is associated with a second antenna port subset of the antenna port group.

[0125] In a third aspect, alone or in combination with one or more of the first and second aspects, only a single PTRS port will be associated with a codeword, and the single PTRS port will be associated with the first and second antenna port subgroups of the antenna port group.

[0126] In a fourth aspect, alone or in combination with one or more of the first to third aspects, the number of PTRS ports associated with a codeword is based at least in part on a precoding indicator indicated by a transmission parameter of the codeword.

[0127] In a fifth aspect, alone or in combination with one or more of the first to fourth aspects, multiple PTRS ports are associated with a codeword when the precoding indicator indicates a precoder for a first antenna port subgroup and a second antenna port subgroup of the antenna port group associated with the codeword, and the maximum number of PTRS ports associated with the codeword is greater than one PTRS port.

[0128] In a sixth aspect, alone or in combination with one or more of the first to fifth aspects, when the precoding indicator indicates a precoder of one of the first antenna port subgroup or the second antenna port subgroup of the antenna port group associated with the codeword, and the maximum number of PTRS ports associated with the codeword is greater than one PTRS port, only a single PTRS port is associated with the codeword.

[0129] In a seventh aspect, alone or in combination with one or more of the first to sixth aspects, when the maximum number of PTRS ports associated with the codeword is one PTRS port, only a single PTRS port is associated with the codeword.

[0130] In the eighth aspect, alone or in combination with one or more of the first to seventh aspects, sending the DCI identifying the transmission parameters further enables the UE to determine the mapping of the DMRS port to the PTRS port associated with the codeword, and the PTRS port will use the same precoding as the layer identified by the precoding indicator associated with the DMRS port and indicated by the transmission parameters of the codeword.

[0131] In a ninth aspect, alone or in combination with one or more of the first to eighth aspects, the DCI includes an indication of the mapping when only a single PTRS port is associated with the codeword and the precoding indicator identifies precoders for multiple layers using the same antenna port subset of the antenna port group associated with the codeword.

[0132] In the tenth aspect, alone or in combination with one or more of the first to ninth aspects, the mapping is a one-to-one mapping when the number of PTRS ports associated with the codeword corresponds to the number of layers identified by the precoding indicator that use different antenna port subgroups of the antenna port group associated with the codeword.

[0133] In the eleventh aspect, alone or in combination with one or more of the first to tenth aspects, sending the DCI identifying the transmission parameters further enables the UE to determine the temporal density of multiple PTRS ports to be associated with multiple codewords based at least in part on the highest MCS indicated by the transmission parameters of the multiple codewords.

[0134] In the twelfth aspect, alone or in combination with one or more of the first to eleventh aspects, sending a DCI identifying a transmission parameter further enables the UE to determine the temporal density of one or more PTRS ports to be associated with a codeword based at least in part on the MCS indicated by the transmission parameter of the codeword.

[0135] In the thirteenth aspect, alone or in combination with one or more of the first to twelfth aspects, sending the DCI identifying the transmission parameters further enables the UE to determine the frequency density of multiple PTRS ports to be associated with the multiple codewords based at least in part on the bandwidth indicated by the transmission parameters of the multiple codewords.

[0136] In a fourteenth aspect, alone or in combination with one or more of aspects one to thirteen, sending the DCI identifying the transmission parameters further enables the UE to determine the power boost of the PTRS ports to be associated with the codeword based at least in part on the number of layers identified by the precoding indicator indicated by the transmission parameters of the codeword and the total number of PTRS ports to be associated with the multiple codewords.

[0137] although Figure 7Example blocks of process 700 are shown, but in some aspects, process 700 may include Figure 7 More blocks, fewer blocks, different blocks, or a different arrangement of blocks than shown. Additionally or alternatively, two or more blocks of process 700 can be executed in parallel.

[0138] 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 are possible in light of the above disclosure or may be acquired from practice of the various aspects.

[0139] As used herein, the term "component" is intended to be broadly interpreted as hardware, firmware, and / or a combination of hardware and software. As used herein, a processor is implemented using hardware, firmware, and / or a combination of hardware and software.

[0140] Some aspects are described herein in conjunction with thresholds. As used herein, satisfying a threshold may refer to a value greater than a threshold, greater than or equal to a threshold, less than a threshold, less than or equal to a threshold, equal to a threshold, not equal to a threshold, etc., depending on the context.

[0141] Obviously, the systems and / or methods described herein can be implemented in various forms of hardware, firmware, and / or a combination of hardware and software. The actual dedicated control hardware or software code used to implement these systems and / or methods is not limiting of the various aspects. Therefore, the operation and behavior of the systems and / or methods are described herein without reference to specific software code - it is understood that software and hardware can be designed to implement the systems and / or methods based at least in part on the description herein.

[0142] 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 the various aspects. In fact, most of these features can be combined in ways that are 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 each aspect includes each dependent claim in combination with all other claims in the claim set. A phrase referring to "at least one of" a list of items refers to any combination of these items, including single members. As an example, "at least one of: a, b, or c" is intended to cover any combination of a, b, c, ab, ac, bc, and abc, and multiples of the same elements (e.g., aa, aaa, aab, aac, abb, acc, bb, bbb, bbc, cc, and ccc, or any other order of a, b, and c).

[0143] As used herein, the elements, actions or instructions should not be interpreted as being critical or necessary unless explicitly described as such. In addition, as used herein, the articles "one" and "an" are intended to include one or more items and can be used interchangeably with "one or more". In addition, as used herein, the terms "set" and "group" are intended to include one or more items (such as related items, unrelated items, a combination of related items and unrelated items, etc.) and can be used interchangeably with "one or more". In the case of only one item being expected, the phrase "only one" or similar language is used. In addition, as used herein, the terms "has", "have", "with", etc. are intended to be open terms. In addition, unless otherwise expressly stated, the phrase "based on" is intended to mean "based at least in part on".

Claims

1. A wireless communication method performed by a user equipment (UE), comprising: receiving downlink control information (DCI) identifying transmission parameters of a plurality of codewords for uplink communications using a plurality of antenna port groups; determining a temporal density of a plurality of PTRS ports associated with the plurality of codewords based at least in part on a highest modulation and coding scheme indicated for the plurality of codewords; and transmitting the uplink communication using the plurality of codewords based at least in part on an association between a Phase Tracking Reference Signal (PTRS) port and the plurality of codewords; wherein the power boosting of the PTRS ports associated with codewords of the plurality of codewords is based at least in part on a number of layers identified by a precoding indicator indicated by the transmission parameters of the plurality of codewords and a total number of PTRS ports associated with the plurality of codewords.

2. The method according to claim 1, wherein A maximum number of PTRS ports associated with a codeword of the plurality of codewords is based at least in part on a UE capability report for a codebook type for an antenna port group of the plurality of antenna port groups associated with the codeword.

3. The method according to claim 2, wherein: A plurality of PTRS ports are associated with the codeword, a first PTRS port of the plurality of PTRS ports is associated with a first antenna port subgroup of the antenna port group, and a second PTRS port of the plurality of PTRS ports is associated with a second antenna port subgroup of the antenna port group.

4. The method of claim 2, wherein a single PTRS port is associated with the codeword, and the single PTRS port is associated with a first antenna port subgroup and a second antenna port subgroup of the antenna port group.

5. The method according to claim 1, wherein The number of PTRS ports associated with a codeword of the plurality of codewords is based at least in part on a precoding indicator indicated by the transmission parameter of the codeword.

6. The method according to claim 5, wherein: In response to the precoding indicator indicating precoders for a first antenna port subset and a second antenna port subset of the antenna port group for the multiple PTRS ports associated with the codeword and a maximum number of PTRS ports associated with the codeword being greater than one PTRS port, the multiple PTRS ports are associated with the codeword.

7. The method according to claim 5, wherein: In response to the precoding indicator indicating a precoder for one of the first antenna port subset or the second antenna port subset of the antenna port group of multiple PTRS ports associated with the codeword and the maximum number of PTRS ports associated with the codeword being more than one PTRS port, a single PTRS port is associated with the codeword.

8. The method according to claim 5, wherein In response to the maximum number of PTRS ports associated with the codeword being one PTRS port, a single PTRS port is associated with the codeword.

9. The method according to claim 1, further comprising: determining a mapping of demodulation reference signal (DMRS) ports to PTRS ports associated with codewords of the plurality of codewords, The PTRS port uses the same precoding as a layer, the layer is associated with the DMRS port, and is identified by a precoding indicator indicated by the transmission parameter of the codeword.

10. The method according to claim 9, wherein: In response to a single PTRS port being associated with the codeword, and a precoding indicator identifying precoders for multiple layers using a same antenna port subset of antenna port groups of multiple PTRS ports associated with the codeword, the mapping is based at least in part on an indication in the DCI.

11. The method according to claim 9, wherein In response to the number of PTRS ports associated with the codeword corresponding to the number of layers identified by the precoding indicator that use different antenna port subsets of the antenna port groups of the multiple antenna port groups associated with the codeword, the mapping is a one-to-one mapping.

12. The method of claim 1, wherein: A frequency density of the PTRS ports associated with the plurality of codewords is based at least in part on bandwidths indicated by the transmission parameters of the plurality of codewords.

13. A wireless communication method performed at a network node, comprising: sending downlink control information (DCI) identifying transmission parameters of a plurality of codewords for uplink communication, the uplink communication using a plurality of antenna port groups; determining a temporal density of a plurality of PTRS ports associated with the plurality of codewords based at least in part on a highest modulation and coding scheme indicated for the plurality of codewords; and receiving the uplink communication using the plurality of codewords based at least in part on an association between a Phase Tracking Reference Signal (PTRS) port and the plurality of codewords; wherein the power boosting of the PTRS ports associated with codewords of the plurality of codewords is based at least in part on a number of layers identified by a precoding indicator indicated by the transmission parameters of the plurality of codewords and a total number of PTRS ports associated with the plurality of codewords.

14. The method of claim 13, wherein: The maximum number of PTRS ports associated with a codeword of the plurality of codewords is based at least in part on a user equipment capability report for a codebook type for an antenna port group of the plurality of antenna port groups associated with the codeword.

15. The method according to claim 14, wherein A plurality of PTRS ports are associated with the codeword, a first PTRS port of the plurality of PTRS ports is associated with a first antenna port subgroup of the antenna port group, and a second PTRS port of the plurality of PTRS ports is associated with a second antenna port subgroup of the antenna port group.

16. The method of claim 14, wherein a single PTRS port is associated with the codeword, and the single PTRS port is associated with a first antenna port subset and a second antenna port subset of the antenna port group.

17. The method according to claim 13, wherein: The number of PTRS ports associated with a codeword of the plurality of codewords is based at least in part on a precoding indicator indicated by a transmission parameter of the codeword.

18. The method according to claim 17, wherein In response to a precoding indicator indicating a precoder for a first antenna port subset and a second antenna port subset of the antenna port groups of the multiple antenna port groups associated with the codeword, and a maximum number of PTRS ports associated with the codeword being more than one PTRS port, the multiple PTRS ports are associated with the codeword.

19. The method according to claim 17, wherein In response to the precoding indicator indicating a precoder for one of the first antenna port subset or the second antenna port subset of the antenna port groups of the multiple antenna port groups associated with the codeword, and the maximum number of PTRS ports associated with the codeword is more than one PTRS port, a single PTRS port is associated with the codeword.

20. The method according to claim 17, wherein In response to the maximum number of PTRS ports associated with the codeword being one PTRS port, a single PTRS port is associated with the codeword.

21. A user equipment (UE) for wireless communication, comprising: Memory; and one or more processors coupled to the memory, the one or more processors configured to: receiving downlink control information (DCI) identifying transmission parameters of a plurality of codewords for uplink communications using a plurality of antenna port groups; determining a temporal density of a plurality of PTRS ports associated with the plurality of codewords based at least in part on a highest modulation and coding scheme indicated for the plurality of codewords; and transmitting the uplink communication using the plurality of codewords based at least in part on an association between a Phase Tracking Reference Signal (PTRS) port and the plurality of codewords; wherein the power boosting of the PTRS ports associated with codewords of the plurality of codewords is based at least in part on a number of layers identified by a precoding indicator indicated by the transmission parameters of the plurality of codewords and a total number of PTRS ports associated with the plurality of codewords.

22. The UE according to claim 21, wherein: The maximum number of PTRS ports associated with a codeword of the plurality of codewords is based at least in part on a UE capability report of a codebook type for an antenna port group of the plurality of antenna port groups associated with the codeword.

23. The UE according to claim 21, wherein The number of PTRS ports associated with a codeword of the plurality of codewords is based at least in part on a precoding indicator indicated by a transmission parameter of the codeword.

24. The UE according to claim 21, wherein The one or more processors are further configured to: determining a mapping of demodulation reference signal (DMRS) ports to PTRS ports associated with codewords of the plurality of codewords, The PTRS port will use the same precoding as the layer associated with the DMRS port, which is identified by the precoding indicator indicated by the transmission parameters of the codeword.

25. The UE according to claim 22, wherein A plurality of PTRS ports are associated with the codeword, a first PTRS port of the plurality of PTRS ports is associated with a first antenna port subgroup of the antenna port group, and a second PTRS port of the plurality of PTRS ports is associated with a second antenna port subgroup of the antenna port group.

26. The UE of claim 22, wherein a single PTRS port is associated with the codeword, and the single PTRS port is associated with a first antenna port subgroup and a second antenna port subgroup of the antenna port group.

27. The UE according to claim 23, wherein: In response to the precoding indicator indicating precoders for a first antenna port subset and a second antenna port subset of the antenna port group for the multiple PTRS ports associated with the codeword and a maximum number of PTRS ports associated with the codeword being greater than one PTRS port, the multiple PTRS ports are associated with the codeword.

28. The UE according to claim 23, wherein: In response to the precoding indicator indicating a precoder for one of the first antenna port subset or the second antenna port subset of the antenna port group of multiple PTRS ports associated with the codeword and the maximum number of PTRS ports associated with the codeword being more than one PTRS port, a single PTRS port is associated with the codeword.

29. The UE according to claim 23, wherein: In response to the maximum number of PTRS ports associated with the codeword being one PTRS port, a single PTRS port is associated with the codeword.

30. The UE according to claim 24, wherein In response to a single PTRS port being associated with the codeword, and a precoding indicator identifying precoders for multiple layers using a same antenna port subset of antenna port groups of multiple PTRS ports associated with the codeword, the mapping is based at least in part on an indication in the DCI.

31. The UE according to claim 24, wherein In response to the number of PTRS ports associated with the codeword corresponding to the number of layers identified by the precoding indicator that use different antenna port subsets of the antenna port groups of the multiple antenna port groups associated with the codeword, the mapping is a one-to-one mapping.

32. A network node for wireless communication, comprising: Memory; and one or more processors coupled to the memory, the one or more processors configured to: sending downlink control information (DCI) identifying transmission parameters of a plurality of codewords for uplink communication, the uplink communication using a plurality of antenna port groups; determining a temporal density of a plurality of PTRS ports associated with the plurality of codewords based at least in part on a highest modulation and coding scheme indicated for the plurality of codewords; and receiving the uplink communication using the plurality of codewords based at least in part on an association between a Phase Tracking Reference Signal (PTRS) port and the plurality of codewords; wherein the power boosting of the PTRS ports associated with codewords of the plurality of codewords is based at least in part on a number of layers identified by a precoding indicator indicated by the transmission parameters of the plurality of codewords and a total number of PTRS ports associated with the plurality of codewords.

33. The network node according to claim 32, wherein: A maximum number of PTRS ports associated with a codeword of the plurality of codewords is based at least in part on a user equipment capability report of a codebook type for one of the plurality of antenna port groups associated with the codeword.

34. The network node of claim 32, wherein a number of PTRS ports to be associated with a codeword of the plurality of codewords is based at least in part on a precoding indicator indicated by a transmission parameter of the codeword.

35. The network node according to claim 33, wherein: A plurality of PTRS ports are associated with the codeword, a first PTRS port of the plurality of PTRS ports is associated with a first antenna port subgroup of the antenna port group, and a second PTRS port of the plurality of PTRS ports is associated with a second antenna port subgroup of the antenna port group.

36. The network node of claim 33, wherein a single PTRS port is associated with the codeword, and the single PTRS port is associated with a first antenna port subset and a second antenna port subset of the antenna port group.

37. The network node according to claim 34, wherein: In response to a precoding indicator indicating a precoder for a first antenna port subset and a second antenna port subset of the antenna port groups of the multiple antenna port groups associated with the codeword, and a maximum number of PTRS ports associated with the codeword being more than one PTRS port, the multiple PTRS ports are associated with the codeword.

38. The network node according to claim 34, wherein: In response to the precoding indicator indicating a precoder for one of the first antenna port subset or the second antenna port subset of the antenna port groups of the multiple antenna port groups associated with the codeword, and the maximum number of PTRS ports associated with the codeword is more than one PTRS port, a single PTRS port is associated with the codeword.

39. The network node according to claim 34, wherein: In response to the maximum number of PTRS ports associated with the codeword being one PTRS port, a single PTRS port is associated with the codeword.

40. A user equipment (UE) for wireless communication, comprising: means for receiving downlink control information (DCI) identifying transmission parameters of a plurality of codewords for uplink communications using a plurality of antenna port groups; means for determining a temporal density of a plurality of PTRS ports associated with the plurality of codewords based at least in part on a highest modulation and coding scheme indicated for the plurality of codewords; and means for transmitting the uplink communication using the plurality of codewords based at least in part on an association between a Phase Tracking Reference Signal (PTRS) port and the plurality of codewords; wherein the power boosting of the PTRS ports associated with codewords of the plurality of codewords is based at least in part on a number of layers identified by a precoding indicator indicated by the transmission parameters of the plurality of codewords and a total number of PTRS ports associated with the plurality of codewords.

41. A computer readable medium storing computer executable code at a user equipment (UE), the code, when executed by one or more processors, causing the one or more processors to: receiving downlink control information (DCI) identifying transmission parameters of a plurality of codewords for uplink communications using a plurality of antenna port groups; determining a temporal density of a plurality of PTRS ports associated with the plurality of codewords based at least in part on a highest modulation and coding scheme indicated for the plurality of codewords; and transmitting the uplink communication using the plurality of codewords based at least in part on an association between a Phase Tracking Reference Signal (PTRS) port and the plurality of codewords; wherein the power boosting of the PTRS ports associated with codewords of the plurality of codewords is based at least in part on a number of layers identified by a precoding indicator indicated by the transmission parameters of the plurality of codewords and a total number of PTRS ports associated with the plurality of codewords.

42. A network node for wireless communication, comprising: means for transmitting downlink control information (DCI) identifying transmission parameters of a plurality of codewords for uplink communications using a plurality of antenna port groups; means for determining a temporal density of a plurality of PTRS ports associated with the plurality of codewords based at least in part on a highest modulation and coding scheme indicated for the plurality of codewords; and means for receiving the uplink communication using the plurality of codewords based at least in part on an association between a Phase Tracking Reference Signal (PTRS) port and the plurality of codewords; wherein the power boosting of the PTRS ports associated with codewords of the plurality of codewords is based at least in part on a number of layers identified by a precoding indicator indicated by the transmission parameters of the plurality of codewords and a total number of PTRS ports associated with the plurality of codewords.

43. A computer readable medium storing computer executable code at a network node, the code, when executed by one or more processors, causing the one or more processors to: sending downlink control information (DCI) identifying transmission parameters of a plurality of codewords for uplink communication, the uplink communication using a plurality of antenna port groups; determining a temporal density of a plurality of PTRS ports associated with the plurality of codewords based at least in part on a highest modulation and coding scheme indicated for the plurality of codewords; and receiving the uplink communication using the plurality of codewords based at least in part on an association between a Phase Tracking Reference Signal (PTRS) port and the plurality of codewords; wherein the power boosting of the PTRS ports associated with codewords of the plurality of codewords is based at least in part on a number of layers identified by a precoding indicator indicated by the transmission parameters of the plurality of codewords and a total number of PTRS ports associated with the plurality of codewords.

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