Per panel PTRS density for UE cooperation

Abstract

Apparatuses and methods for per-panel PTRS density for a panel / antenna set of a UE are described. An apparatus is configured to: transmit information associated with a PTRS density for each panel in a set of panels associated with the UE; receiving, from a network entity, a configuration associated with the PTRS density for each panel in the set of panels; and communicating, based on the configuration, downlink data via a PDSCH or uplink data via a PUSCH based on the PTRS density for one of the panels in the set of panels, wherein the PTRS density for the one panel of the set of panels is based on at least one of a number of MCSs or scheduled RBs associated with PDSCH reception or PUSCH transmission through the one panel. Another device is configured to receive the information, generate and transmit the configuration, and also communicate via the PDSCH / PUSCH.

Description

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application claims the benefit of U.S. patent application serial number 17 / 934,531, filed on September 22, 2022, entitled “PER-PANEL PTRS DENSITY FOR UECOOPERATION,” which is expressly incorporated herein by reference in its entirety. Technical Field

[0003] The present disclosure relates generally to communication systems, and more particularly to wireless communications utilizing Phase Tracking Reference Signal (PTRS) density. Background Art

[0004] 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. 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, and time division synchronous code division multiple access (TD-SCDMA) systems.

[0005] These multiple access technologies have been adopted in various telecommunication standards to provide a common protocol that enables different wireless devices to communicate at a city, country, region, and even global level. An example telecommunication standard is 5G New Radio (NR). 5G NR is part of the continuous mobile broadband evolution promulgated by the Third Generation Partnership Project (3GPP) to meet new requirements associated with latency, reliability, security, scalability (e.g., with the Internet of Things (IoT)) and other requirements. 5G NR includes services associated with enhanced mobile broadband (eMBB), massive machine type communications (mMTC), and ultra-reliable low latency communications (URLLC). Certain aspects of 5G NR may be based on the 4G Long Term Evolution (LTE) standard. Further improvements to 5G NR technology are needed. In addition, these improvements may also be applicable to other multiple access technologies and telecommunication standards that employ these technologies. Summary of the invention

[0006] A simplified overview of one or more aspects is presented below to provide a basic understanding of these aspects. This summary is not an extensive review of all contemplated aspects. This summary neither identifies the key or important elements of all aspects, nor describes the scope of any or all aspects. Its sole purpose is to present some concepts of one or more aspects in a simplified form as a prelude to a more detailed description presented later.

[0007] In one aspect of the present disclosure, a method, computer-readable medium, and apparatus for wireless communication at a user equipment (UE) are provided. The apparatus is configured to send information associated with a phase tracking reference signal (PTRS) density for each panel in a set of panels associated with the UE. The apparatus is also configured to receive a configuration associated with the PTRS density for each panel in the set of panels from a network entity. The apparatus is further configured to communicate downlink data via a physical downlink shared channel (PDSCH) or uplink data via a physical uplink shared channel (PUSCH) based on the configuration, based on the PTRS density for one panel in the set of panels, wherein the PTRS density for the one panel in the set of panels is based on at least one of a modulation and coding scheme (MCS) associated with PDSCH reception or PUSCH transmission by the one panel or the number of scheduled resource blocks (RBs).

[0008] In this aspect, the method includes sending information associated with a phase tracking reference signal (PTRS) density for each panel in a set of panels associated with the UE. The method also includes receiving a configuration associated with the PTRS density for each panel in the set of panels from a network entity. The method also includes communicating downlink data via a physical downlink shared channel (PDSCH) or uplink data via a physical uplink shared channel (PUSCH) based on the PTRS density for one panel in the set of panels based on the configuration, wherein the PTRS density for the one panel in the set of panels is based on at least one of a modulation and coding scheme (MCS) or a number of scheduled resource blocks (RBs) associated with PDSCH reception or PUSCH transmission by the one panel.

[0009] In another aspect of the present disclosure, a method, computer-readable medium, and apparatus for wireless communication at a network node are provided. The apparatus is configured to receive information associated with a phase tracking reference signal (PTRS) density for each panel in a set of panels associated with the UE from a user equipment (UE). The apparatus is also configured to send a configuration associated with the PTRS density for each panel in the set of panels to the UE. The apparatus is further configured to communicate downlink data via a physical downlink shared channel (PDSCH) or uplink data via a physical uplink shared channel (PUSCH) with the UE based on the configuration, based on the PTRS density for one panel in the set of panels, wherein the PTRS density for the one panel in the set of panels is based on at least one of a modulation and coding scheme (MCS) associated with PDSCH reception or PUSCH transmission by the one panel or the number of scheduled resource blocks (RBs).

[0010] In this aspect, the method includes receiving information associated with a phase tracking reference signal (PTRS) density for each panel in a set of panels associated with the UE from a user equipment (UE). The method also includes sending, to the UE, a configuration associated with the PTRS density for each panel in the set of panels. The method also includes communicating, with the UE, based on the configuration, downlink data via a physical downlink shared channel (PDSCH) or uplink data via a physical uplink shared channel (PUSCH) based on the PTRS density for one panel in the set of panels, wherein the PTRS density for the one panel in the set of panels is based on at least one of a modulation and coding scheme (MCS) associated with PDSCH reception or PUSCH transmission by the one panel or a number of scheduled resource blocks (RBs).

[0011] To achieve the aforementioned and related purposes, one or more aspects include the features fully described below and particularly pointed out in the claims. The following description and the accompanying drawings set forth in detail some exemplary features of one or more aspects. However, these features indicate only some of the various ways in which the principles of the various aspects can be employed. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 is a diagram illustrating an example of a wireless communication system and an access network.

[0013] Figure 2A is a diagram illustrating an example of a first frame according to various aspects of the present disclosure.

[0014] Figure 2B is a diagram illustrating an example of downlink (DL) channels within a subframe according to various aspects of the present disclosure.

[0015] Figure 2C is a diagram illustrating an example of a second frame according to various aspects of the present disclosure.

[0016] Figure 2D is a diagram illustrating an example of uplink (UL) channels within a subframe according to various aspects of the present disclosure.

[0017] Figure 3 is a diagram illustrating an example of a base station and a user equipment (UE) in an access network.

[0018] Figure 4 is a diagram illustrating Phase Tracking Reference Signal (PTRS) density and configuration according to various aspects of the present disclosure.

[0019] Figure 5 is a diagram illustrating UE cooperation according to various aspects of the present disclosure.

[0020] Figure 6 is a call flow diagram for wireless communications according to various aspects of the present disclosure.

[0021] Figure 7 is a diagram illustrating a UE panel according to various aspects of the present disclosure.

[0022] Figure 8 is a diagram illustrating wireless communications with per-panel PTRS density for a UE panel in accordance with various aspects of the present disclosure.

[0023] Fig. 9 is a flow chart of a method of wireless communication according to various aspects of the present disclosure.

[0024] Fig.10 is a flow chart of a method of wireless communication according to various aspects of the present disclosure.

[0025] Fig.11 is a flow chart of a method of wireless communication according to various aspects of the present disclosure.

[0026] Fig.12 is a flow chart of a method of wireless communication according to various aspects of the present disclosure.

[0027] Fig.13 are diagrams illustrating examples of hardware implementations for example apparatuses and / or network entities.

[0028] Fig.14 is a diagram illustrating an example of a hardware implementation for an example network entity. DETAILED DESCRIPTION

[0029] Various aspects of this document relate to per-panel Phase Tracking Reference Signal (PTRS) density and configuration thereof for a panel / antenna set of a user equipment (UE). In NR (e.g., 5G NR), PRTS is defined for both the Physical Downlink Shared Channel (PDSCH) and the Physical Uplink Shared Channel (PUSCH), but is not utilized in a per-panel configuration. Additionally, UE collaboration with distributed panels via virtual UEs enables improved RF capabilities, however the UEs in the collaboration do not share a local oscillator and therefore phase noise correction cannot be obtained on a per-panel basis. The described aspects provide the ability to configure and utilize distributed panels with corresponding PTRS densities based on UE recommendations for PTRS thresholds for various frequency bands.

[0030] The specific embodiments described below in conjunction with the accompanying drawings are descriptions of various configurations and do not represent the only configurations in which the concepts described herein can be practiced. In order to provide a thorough understanding of the various concepts, the specific embodiments include specific details. However, these concepts can be practiced without these specific details. In some instances, well-known structures and components are shown in block diagram form to avoid blurring these concepts.

[0031] Several aspects of telecommunication systems are presented with reference to various apparatus and methods. These apparatus and methods are described in the following detailed description and illustrated in the accompanying drawings by various blocks, components, circuits, processes, algorithms, etc. (collectively referred to as "elements"). These elements may be implemented using electronic hardware, computer software, or any 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.

[0032] As an example, an element or any part of an element or any combination of elements can be implemented as a "processing system", which includes one or more processors. Examples of processors include microprocessors, microcontrollers, graphics processing units (GPUs), central processing units (CPUs), application processors, digital signal processors (DSPs), reduced instruction set computing (RISC) processors, systems on chip (SoCs), baseband processors, field programmable gate arrays (FPGAs), programmable logic devices (PLDs), state machines, gated logic components, discrete hardware circuits, and other suitable hardware configured to perform various functions described throughout the present disclosure. One or more processors in a processing system can execute software. Whether referred to as software, firmware, middleware, microcode, hardware description language, or other terms, software should be broadly interpreted as meaning instructions, instruction sets, codes, code segments, program codes, programs, subroutines, software components, applications, software applications, software packages, routines, subroutines, objects, executables, threads of execution, procedures, functions, or any combination thereof.

[0033] Thus, in one or more example aspects, specific implementations and / or use cases, the described functionality may be implemented in hardware, software, or any combination thereof. If implemented in software, the functionality may be stored or encoded as one or more instructions or codes on a computer-readable medium. Computer-readable media include computer storage media. Storage media may be any available media that can be accessed by a computer. As an example, such computer-readable media may include random access memory (RAM), read-only memory (ROM), electrically erasable programmable ROM (EEPROM), optical disk storage, magnetic disk storage, other magnetic storage devices, combinations of these types of computer-readable media, or any other media that can be used to store computer-executable code in the form of instructions or data structures that can be accessed by a computer.

[0034] Although various aspects, specific implementations and / or use cases are described in this application by the illustration of some examples, additional or different aspects, specific implementations and use cases may be generated in many different arrangements and scenarios. The various aspects, specific implementations and / or use cases described herein can be implemented across many different platform types, devices, systems, shapes, sizes and packaging arrangements. For example, various aspects, specific implementations and / or use cases can be generated via integrated chip specific implementations and other devices based on non-module components (e.g., end-user devices, vehicles, communication equipment, computing equipment, industrial equipment, retail / purchase equipment, medical equipment, devices that enable artificial intelligence (AI), etc.). Although some examples may or may not be specifically for use cases or applications, the described examples may have a wide range of applicability. Various aspects, specific implementations and / or use cases may be in the range from chip-level or modular components to non-modular, non-chip-level specific implementations, and further to the range of aggregated, distributed or original equipment manufacturer (OEM) devices or systems in conjunction with one or more technologies herein. In some actual settings, the equipment combined with the various aspects and features described may also include additional components and features for implementing and practicing the claimed and described aspects. For example, the transmission and reception of wireless signals necessarily include multiple components for analog and digital purposes (e.g., hardware components including antennas, RF chains, power amplifiers, modulators, buffers, processors, interleavers, adders / summers, etc.) The various techniques described herein can be practiced in a wide variety of devices, chip-level components, systems, distributed arrangements, aggregated or disaggregated components, end-user devices, etc., of various sizes, shapes, and configurations.

[0035] The deployment of a communication system (such as a 5G NR system) can be arranged in a variety of ways using various components or constituent parts. In a 5G NR system or network, a network node, a network entity, a mobility element of a network, a radio access network (RAN) node, a core network node, a network element or network equipment (such as a base station (BS)) or one or more units (or one or more components) performing base station functions can be implemented in an aggregated or decomposed architecture. For example, a BS (such as a Node B (NB), an evolved NB (eNB), an NR BS, a 5G NB, an access point (AP), a transmit receive point (TRP) or a cell, etc.) can be implemented as an aggregated base station (also referred to as an independent BS or a monolithic BS) or a decomposed base station.

[0036] A converged base station may be configured to utilize a radio protocol stack physically or logically integrated within a single RAN node. A decomposed base station may be configured to utilize a protocol stack physically or logically distributed between two or more units, such as one or more central or centralized units (CUs), one or more distributed units (DUs), or one or more radio units (RUs). In some aspects, a CU may be implemented within a RAN node, and one or more DUs may be co-located with the CU, or alternatively, may be geographically or virtually distributed in one or more other RAN nodes. A DU may be implemented to communicate with one or more RUs. Each of a CU, a DU, and a RU may be implemented as a virtual unit, i.e., a virtual central unit (VCU), a virtual distributed unit (VDU), or a virtual radio unit (VRU).

[0037] Base station operation or network design may take into account the aggregated nature of base station functionality. For example, a disaggregated base station may be used in an integrated access backhaul (IAB) network, an open radio access network (O-RAN (network configurations such as those initiated by the O-RAN Alliance)), or a virtualized radio access network (vRAN, also known as a cloud radio access network (C-RAN)). Decomposition may include distributing functionality across two or more units at various physical locations, as well as virtually distributing functionality of at least one unit, which may enable flexibility in network design. Various units of a disaggregated base station or disaggregated RAN architecture may be configured for wired or wireless communication with at least one other unit.

[0038] Figure 11 is a diagram 100 illustrating an example of a wireless communication system and an access network. The illustrated wireless communication system includes a disaggregated base station architecture. The disaggregated base station architecture may include one or more CUs 110 that may communicate directly with a core network 120 via a backhaul link, or indirectly with the core network 120 through one or more disaggregated base station units, such as a near real-time (near RT) RAN intelligent controller (RIC) 125 via an E2 link, or a non-real-time (non-RT) RIC 115 associated with a service management and orchestration (SMO) framework 105, or both. The CU 110 may communicate with one or more DUs 130 via corresponding midhaul links, such as an F1 interface. The DU 130 may communicate with one or more RUs 140 via corresponding fronthaul links. The RU 140 may communicate with corresponding UEs 104 via one or more radio frequency (RF) access links. In some implementations, a UE 104 may be served simultaneously by multiple RUs 140.

[0039] Each of these units (i.e., CU 110, DU 130, RU 140, and near-RT RIC 125, non-RT RIC 115, and SMO framework 105) may include or be coupled to one or more interfaces configured to receive or send signals, data, or information (collectively, signals) via a wired or wireless transmission medium. Each of the units or an associated processor or controller that provides instructions to the communication interface of these units may be configured to communicate with one or more of the other units via a transmission medium. For example, these units may include a wired interface configured to receive signals or send signals to one or more of the other units via a wired transmission medium. Additionally, these units may include a wireless interface that may include a receiver, transmitter, or transceiver (such as an RF transceiver) configured to receive and / or send signals to one or more of the other units via a wireless transmission medium.

[0040] In some aspects, CU 110 may host one or more higher layer control functions. Such control functions may include radio resource control (RRC), packet data convergence protocol (PDCP), service data adaptation protocol (SDAP), etc. Each control function may be implemented using an interface that is configured to communicate signals with other control functions hosted by CU 110. CU 110 may be configured to handle user plane functions (i.e., central unit-user plane (CU-UP)), control plane functions (i.e., central unit-control plane (CU-CP)), or a combination thereof. In some specific implementations, CU 110 may be logically split into one or more CU-UP units and one or more CU-CP units. When implemented in an O-RAN configuration, the CU-UP unit may communicate bidirectionally with the CU-CP unit via an interface (such as an E1 interface). As needed, CU 110 may be implemented to communicate with DU 130 for network control and signaling.

[0041] DU 130 may correspond to a logical unit that includes one or more base station functions for controlling the operation of one or more RUs 140. In some aspects, DU 130 may host one or more of a radio link control (RLC) layer, a medium access control (MAC) layer, and one or more high physical (PHY) layers (such as modules for forward error correction (FEC) encoding and decoding, scrambling, modulation and demodulation, etc.) at least in part according to a functional split such as those defined by 3GPP. In some aspects, DU 130 may also host one or more low PHY layers. Each layer (or module) may be implemented using an interface that is configured to communicate signals with other layers (and modules) hosted by DU 130 or with control functions hosted by CU 110.

[0042] The lower layer functions may be implemented by one or more RUs 140. In some deployments, the RU 140 controlled by the DU 130 may correspond to a logical node that hosts RF processing functions or low PHY layer functions (such as performing fast Fourier transform (FFT), inverse FFT (iFFT), digital beamforming, physical random access channel (PRACH) extraction and filtering, etc.), or both, based at least in part on functional splitting (such as lower layer functional splitting). In such an architecture, the RU 140 may be implemented to handle over-the-air (OTA) communications with one or more UEs 104. In some specific implementations, real-time and non-real-time aspects of control plane and user plane communications with the RU 140 may be controlled by the corresponding DU 130. In some scenarios, this configuration may enable the implementation of the DU 130 and the CU 110 in a cloud-based RAN architecture (such as a vRAN architecture).

[0043] The SMO framework 105 may be configured to support RAN deployment and provisioning of non-virtualized network elements and virtualized network elements. For non-virtualized network elements, the SMO framework 105 may be configured to support the deployment of dedicated physical resources for RAN coverage requirements, which may be managed via an operation and maintenance interface (such as an O1 interface). For virtualized network elements, the SMO framework 105 may be configured to interact with a cloud computing platform (such as an open cloud (O-Cloud) 190) to perform network element lifecycle management (such as to instantiate virtualized network elements) via a cloud computing platform interface (such as an O2 interface). Such virtualized network elements may include, but are not limited to, CU 110, DU 130, RU 140, and near-RT RIC 125. In some specific implementations, the SMO framework 105 may communicate with hardware aspects of the 4G RAN (such as an open eNB (O-eNB) 111) via the O1 interface. Additionally, in some specific implementations, the SMO framework 105 may communicate directly with one or more RUs 140 via the O1 interface. The SMO framework 105 may also include a non-RT RIC 115 configured to support the functionality of the SMO framework 105 .

[0044] The non-RT RIC 115 may be configured to include logic functions that enable non-real-time control and optimization of RAN elements and resources, artificial intelligence (AI) / machine learning (ML) (AI / ML) workflows including model training and updating, or policy-based guidance of applications / features in the near-RT RIC 125. The non-RT RIC 115 may be coupled to or communicate with the near-RT RIC 125 (such as via an A1 interface). The near-RT RIC 125 may be configured to include logic functions that enable near-real-time control and optimization of RAN elements and resources via data collection and actions through an interface (such as via an E2 interface) that connects one or more CUs 110, one or more DUs 130, or both, and the O-eNB with the near-RT RIC 125.

[0045] In some implementations, in order to generate an AI / ML model to be deployed in the near-RT RIC 125, the non-RT RIC 115 may receive parameters or external enrichment information from an external server. Such information may be utilized by the near-RT RIC 125 and may be received from a non-network data source or from a network function at the SMO framework 105 or the non-RT RIC 115. In some examples, the non-RT RIC 115 or the near-RT RIC 125 may be configured to adjust RAN behavior or performance. For example, the non-RT RIC 115 may monitor long-term trends and patterns of performance and employ AI / ML models to perform corrective actions through the SMO framework 105 (such as via reconfiguration of O1) or via the creation of RAN management policies (such as A1 policies).

[0046] At least one of the CU 110, the DU 130, and the RU 140 may be referred to as a base station 102. Therefore, the base station 102 may include one or more of the CU 110, the DU 130, and the RU 140 (each component is indicated by a dotted line to indicate that each component may be included in the base station 102 or may not be included in the base station). The base station 102 provides an access point to the core network 120 for the UE 104. The base station 102 may include a macro cell (a high-power cellular base station) and / or a small cell (a low-power cellular base station). Small cells include femto cells, pico cells, and micro cells. A network including both small cells and macro cells may be referred to as a heterogeneous network. A heterogeneous network may also include a home evolved Node B (eNB) (HeNB), which may provide services to a restricted group referred to as a closed subscriber group (CSG). The communication link between RU 140 and UE 104 may include uplink (UL) (also known as reverse link) transmission from UE 104 to RU 140 and / or downlink (DL) (also known as forward link) transmission from RU 140 to UE 104. The communication link may use multiple-input multiple-output (MIMO) antenna technology, including spatial multiplexing, beamforming and / or transmit diversity. The communication link may be through one or more carriers. For each carrier allocated in a carrier aggregation of up to Yx MHz (x component carriers) for transmission in each direction, the base station 102 / UE 104 may use a spectrum of up to Y MHz (e.g., 5MHz, 10MHz, 15MHz, 20MHz, 100MHz, 400MHz, etc.) bandwidth. These carriers may or may not be adjacent to each other. The allocation of carriers may be asymmetric with respect to DL and UL (e.g., more or fewer carriers may be allocated to DL than to UL). Component carriers may include a primary component carrier and one or more secondary component carriers. The primary component carrier may be referred to as a primary cell (PCell) and the secondary component carrier may be referred to as a secondary cell (SCell).

[0047] Some UEs 104 may communicate with each other using a device-to-device (D2D) communication link 158. The D2D communication link 158 may use DL / UL wireless wide area network (WWAN) spectrum. The D2D communication link 158 may use one or more sidelink channels, such as a physical sidelink broadcast channel (PSBCH), a physical sidelink discovery channel (PSDCH), a physical sidelink shared channel (PSSCH), and a physical sidelink control channel (PSCCH). The D2D communication may be through a variety of wireless D2D communication systems, such as, for example, Bluetooth, Wi-Fi based on the Institute of Electrical and Electronics Engineers (IEEE) 802.11 standard, LTE, or NR.

[0048] The wireless communication system may also include a Wi-Fi AP 150 that communicates with a UE 104 (also referred to as a Wi-Fi station (STA)) via a communication link 154, e.g., in a 5 GHz unlicensed spectrum, etc. When communicating in an unlicensed spectrum, the UE 104 / AP 150 may perform a clear channel assessment (CCA) to determine whether a channel is available prior to communication.

[0049] The electromagnetic spectrum is typically subdivided into various categories, bands, channels, etc. based on frequency / wavelength. In 5G NR, two initial operating bands have been identified as frequency range designations FR1 (410 MHz-7.125 GHz) and FR2 (24.25 GHz-52.6 GHz). Although a portion of FR1 is greater than 6 GHz, FR1 is often referred to (interchangeably) as the "sub-6 GHz" band in various documents and articles. A similar naming issue sometimes occurs with respect to FR2, which is often (interchangeably) referred to as the "millimeter wave" band in documents and articles, although different from the extremely high frequency (EHF) band (30 GHz-300 GHz) identified as the "millimeter wave" band by the International Telecommunication Union (ITU).

[0050] Frequencies between FR1 and FR2 are generally referred to as mid-band frequencies. Recent 5G NR research has identified the operating bands for these mid-band frequencies as frequency range designation FR3 (7.125GHz-24.25GHz). The bands falling within FR3 can inherit FR1 characteristics and / or FR2 characteristics, and therefore the features of FR1 and / or FR2 can be effectively extended to mid-band frequencies. In addition, currently exploring higher frequency bands to extend 5G NR operation to more than 52.6GHz. For example, three higher operating bands have been identified as frequency range designations FR2-2 (52.6GHz-71GHz), FR4 (71GHz-114.25GHz) and FR5 (114.25GHz-300GHz). Each of these higher frequency bands falls within the EHF band.

[0051] In view of the above, unless otherwise specified, if the term "6 GHz or less" is used herein, it may broadly refer to frequencies that may be less than 6 GHz, may be within FR1, or may include mid-band frequencies. In addition, unless otherwise specified, if the term "millimeter wave" is used herein, it may broadly refer to frequencies that may include mid-band frequencies, may be within FR2, FR4, FR2-2, and / or FR5, or may be within the EHF band.

[0052] The base station 102 and the UE 104 may each include multiple antennas (such as antenna elements, antenna panels, and / or antenna arrays) to facilitate beamforming. The base station 102 may send a beamformed signal 182 to the UE 104 in one or more transmit directions. The UE 104 may receive the beamformed signal from the base station 102 in one or more receive directions. The UE 104 may also send a beamformed signal 184 to the base station 102 in one or more transmit directions. The base station 102 may receive the beamformed signal from the UE 104 in one or more receive directions. The base station 102 / UE 104 may perform beam training to determine the optimal receive direction and transmit direction for each of the base station 102 / UE 104. The transmit direction and receive direction of the base station 102 may be the same or different. The transmit direction and receive direction of the UE 104 may be the same or different.

[0053] The base station 102 may include and / or be referred to as a gNB, a Node B, an eNB, an access point, a base transceiver station, a radio base station, a radio transceiver, a transceiver function, a basic service set (BSS), an extended service set (ESS), a transmit receive point (TRP), a network node, a network entity, a network equipment, or some other suitable term. The base station 102 may be implemented as an integrated access and backhaul (IAB) node, a relay node, a sidelink node, an aggregated (monolithic) base station with a baseband unit (BBU) (including a CU and a DU) and a RU, or as a decomposed base station including one or more of a CU, a DU, and / or a RU. A set of base stations that may include decomposed base stations and / or aggregated base stations may be referred to as a next generation (NG) RAN (NG-RAN).

[0054] The core network 120 may include an access and mobility management function (AMF) 161, a session management function (SMF) 162, a user plane function (UPF) 163, a unified data management (UDM) 164, one or more location servers 168, and other functional entities. AMF 161 is a control node that handles signaling between UE 104 and the core network 120. AMF 161 supports registration management, connection management, mobility management, and other functions. SMF 162 supports session management and other functions. UPF 163 supports packet routing, packet forwarding, and other functions. UDM 164 supports the generation of authentication and key agreement (AKA) credentials, user identity handling, access authorization, and subscription management. One or more location servers 168 are illustrated as including a gateway mobile location center (GMLC) 165 and a location management function (LMF) 166. However, in general, the one or more location servers 168 may include one or more location / positioning servers, which may include one or more of the GMLC 165, LMF 166, position determination entity (PDE), serving mobile location center (SMLC), mobile positioning center (MPC), etc. GMLC 165 and LMF 166 support UE location services. GMLC 165 provides an interface for clients / applications (e.g., emergency services) to access UE positioning information. LMF 166 receives measurement and assistance information from NG-RAN and UE 104 via AMF 161 to calculate the location of UE 104. NG-RAN may determine the location of UE 104 using one or more positioning methods. Positioning UE 104 may involve signal measurements, position estimation, and optional speed calculation based on these measurements. Signal measurements may be performed by UE 104 and / or serving base station 102. The measured signals may be based on a satellite positioning system (SPS) 170 (e.g., one or more of a global navigation satellite system (GNSS), a global positioning system (GPS), a non-terrestrial network (NTN), or other satellite positioning / location systems), LTE signals, wireless local area network (WLAN) signals, Bluetooth signals, a terrestrial beacon system (TBS), sensor-based information (e.g., an atmospheric pressure sensor, a motion sensor), an NR enhanced cell ID (NR E-CID) method, NR signals (e.g., multi-round trip time (multi-RTT), DL angle of departure (DL-AoD), DL time difference of arrival (DL-TDOA), UL time difference of arrival (UL-TDOA), and UL angle of arrival (UL-AoA) positioning), and / or one or more of other systems / signals / sensors.

[0055] Examples of UE 104 include cellular phones, smart phones, session initiation protocol (SIP) phones, laptops, personal digital assistants (PDAs), satellite radios, global positioning systems, multimedia devices, video devices, digital audio players (e.g., MP3 players), cameras, game consoles, tablet computers, smart devices, wearable devices, vehicles, electric meters, gas pumps, large or small kitchen appliances, healthcare equipment, implants, sensors / actuators, displays, or any other similarly functional devices. Some of the UEs 104 may be referred to as IoT devices (e.g., parking meters, gas pumps, toasters, vehicles, heart monitors, etc.). UE 104 may also be referred to as stations, mobile stations, subscriber stations, mobile units, subscriber units, wireless units, remote units, mobile devices, wireless devices, wireless communication devices, remote devices, mobile subscriber stations, access terminals, mobile terminals, wireless terminals, remote terminals, mobile phones, user agents, mobile clients, clients, or some other suitable terminology. In some scenarios, the term "UE" may also be applied to one or more supporting devices, such as in a device constellation arrangement. One or more of these devices may access the network collectively and / or individually.

[0056] Reference again Figure 1 In certain aspects, the UE 104 may be configured to include a PTRS density component 198 ("component 198") configured to send information associated with a PTRS density for each panel in a set of panels associated with the UE. Component 198 is also configured to receive a configuration associated with the PTRS density for each panel in the set of panels from a network entity. Component 198 is further configured to communicate downlink data via the PDSCH or uplink data via the PUSCH based on the PTRS density for one of the panels in the set of panels based on the configuration, wherein the PTRS density for one of the panels in the set of panels is based on at least one of an MCS or a number of scheduled RBs associated with a PDSCH reception or a PUSCH transmission through the one panel. In some aspects, wherein the threshold associated with the PTRS density included in the information is a UE-recommended threshold for each panel in the set of panels, and wherein the configuration includes a configured threshold associated with the UE-recommended threshold for each panel in the set of panels, component 198 is further configured to determine the PTRS density based on the comparison according to the configuration. In some aspects, component 198 is further configured to determine at least one resource element (RE) based on the PTRS density, and in order to convey downlink data via the PDSCH or uplink data via the PUSCH based on the configuration, component 198 is configured to receive or send PTRS information in the determined at least one RE, respectively.

[0057] In certain aspects, the base station 102 may be configured to include a PTRS density component 199 ("component 199") configured to receive information associated with a PTRS density for each panel in a set of panels associated with the UE from the UE. Component 199 is further configured to send, to the UE, a configuration associated with the PTRS density for each panel in the set of panels. Component 199 is further configured to communicate, with the UE, downlink data via the PDSCH or uplink data via the PUSCH based on the PTRS density for one panel in the set of panels based on the configuration, wherein the PTRS density for one panel in the set of panels is based on at least one of an MCS or a number of scheduled RBs associated with a PDSCH reception or a PUSCH transmission through the one panel. In some aspects, wherein the threshold associated with the PTRS density included in the information is a UE-recommended threshold for each panel in the set of panels, and wherein the configuration includes a configured threshold associated with the UE-recommended threshold for each panel in the set of panels, and component 199 is further configured to configure the configured threshold based on the UE-recommended threshold for determining the PTRS density. In some aspects, component 199 is further configured to receive an indication of at least one determined resource element (RE) based on the PTRS density, and in order to convey downlink data via the PDSCH or uplink data via the PUSCH based on the configuration, component 199 is configured to send or receive PTRS information, respectively, in the determined at least one RE.

[0058] Although the following description may focus on 5G NR, the concepts described herein may be applicable to other similar areas such as LTE, LTE-A, CDMA, GSM, and other wireless technologies.

[0059] Figure 2A FIG200 is a diagram illustrating an example of a first subframe within a 5G NR frame structure. Figure 2B FIG230 is a diagram illustrating an example of DL channels within a 5G NR subframe. Figure 2C FIG250 is a diagram illustrating an example of a second subframe within a 5G NR frame structure. Figure 2D FIG280 is a diagram illustrating an example of UL channels within a 5G NR subframe. The 5G NR frame structure may be frequency division duplex (FDD) (wherein for a particular set of subcarriers (carrier system bandwidth), subframes within that subcarrier set are dedicated to either DL or UL), or may be time division duplex (TDD) (wherein for a particular set of subcarriers (carrier system bandwidth), subframes within that subcarrier set are dedicated to both DL and UL). Figure 2A , Figure 2CIn the example provided, the 5G NR frame structure is assumed to be TDD, where subframe 4 is configured with slot format 28 (most of which are DL), where D is DL, U is UL, and F is flexible between DL / UL, and subframe 3 is configured with slot format 1 (all of which are UL). Although subframes 3 and 4 are shown as having slot formats 1 and 28, respectively, any particular subframe can be configured with any of the various available slot formats 0 to 61. Slot formats 0 and 1 are full DL and full UL, respectively. Other slot formats 2 to 61 include a mix of DL, UL and flexible symbols. The UE is configured with the slot format through the received slot format indicator (SFI) (dynamically configured through DL control information (DCI) or semi-statically / statically configured through radio resource control (RRC) signaling). Note that the following description also applies to the 5GNR frame structure as TDD.

[0060] FIG. 2A to FIG. 2D The frame structure is illustrated, and various aspects of the present disclosure may be applicable to other wireless communication technologies that may have different frame structures and / or different channels. A frame (10ms) may be divided into 10 equally sized subframes (1ms). Each subframe may include one or more time slots. A subframe may also include a microslot, which may include 7, 4, or 2 symbols. Each time slot may include 14 or 12 symbols, depending on whether the cyclic prefix (CP) is normal or extended. For a normal CP, each time slot may include 14 symbols, and for an extended CP, each time slot may include 12 symbols. The symbol on the DL may be a CP orthogonal frequency division multiplexing (OFDM) (CP-OFDM) symbol. The symbol on the UL may be a CP-OFDM symbol (for high throughput scenarios) or a discrete Fourier transform (DFT) extended OFDM (DFT-s-OFDM) symbol (for power-constrained scenarios; limited to single-stream transmission). The number of time slots within a subframe is based on the CP and parameter set. The parameter set defines the subcarrier spacing (SCS) (see Table 1). The symbol length / duration can be scaled by 1 / SCS.

[0061]

[0062] Table 1: Parameter set, SCS and CP

[0063] For normal CP (14 symbols / slot), different parameter sets μ0 to 4 allow 1, 2, 4, 8, and 16 slots per subframe, respectively. For extended CP, parameter set 2 allows 4 slots per subframe. Thus, for normal CP and parameter set μ, there are 14 symbols / slot and 2 μ timeslots / subframe. The subcarrier spacing can be equal to 2 μ*15kHz, where μ is parameter set 0 to 4. Therefore, the subcarrier spacing for parameter set μ=0 is 15kHz, and the subcarrier spacing for parameter set μ=4 is 240kHz. The symbol length / duration is inversely related to the subcarrier spacing. FIG. 2A to FIG. 2D An example of a parameter set μ=2 with a normal CP of 14 symbols per slot and 4 slots per subframe is provided. The slot duration is 0.25 ms, the subcarrier spacing is 60 kHz, and the symbol duration is about 16.67 μs. Within a frame set, there may be one or more different bandwidth parts (BWPs) that are frequency-division multiplexed (see Figure 2B ). Each BWP may have a specific parameter set and CP (normal or extended).

[0064] A resource grid may be used to represent a frame structure. Each slot includes a resource block (RB) (also referred to as a physical RB (PRB)) extending over 12 consecutive subcarriers. The resource grid is divided into a number of resource elements (REs). The number of bits carried by each RE depends on the modulation scheme.

[0065] like Figure 2A As illustrated, some of the REs carry reference (pilot) signals (RS) for the UE. The RS may include a demodulation RS (DM-RS) (indicated as R for a particular configuration, but other DM-RS configurations are possible) and a channel state information reference signal (CSI-RS) for channel estimation at the UE. The RS may also include a beam measurement RS (BRS), a beam refinement RS (BRRS), and a phase tracking RS (PT-RS).

[0066] Figure 2BExamples of various DL channels within a subframe of a frame are illustrated. A physical downlink control channel (PDCCH) carries DCI within one or more control channel elements (CCEs) (e.g., 1, 2, 4, 8, or 16 CCEs), each CCE including six RE groups (REGs), each REG including 12 consecutive REs in an OFDM symbol of an RB. A PDCCH within a BWP may be referred to as a control resource set (CORESET). The UE is configured to monitor PDCCH candidates in a PDCCH search space (e.g., a common search space, a UE-specific search space) during a PDCCH monitoring opportunity on a CORESET, wherein the PDCCH candidates have different DCI formats and different aggregation levels. Additional BWPs may be located at higher and / or lower frequencies on the channel bandwidth. A primary synchronization signal (PSS) may be within symbol 2 of a particular subframe of a frame. The PSS is used by UE 104 to determine subframe / symbol timing and physical layer identification. A secondary synchronization signal (SSS) may be within symbol 4 of a particular subframe of a frame. The SSS is used by the UE to determine the physical layer cell identity group number and the radio frame timing. Based on the physical layer identity and the physical layer cell identity group number, the UE can determine the physical cell identifier (PCI). Based on the PCI, the UE can determine the location of the DM-RS. The physical broadcast channel (PBCH) carrying the master information block (MIB) can be logically grouped with the PSS and SSS to form a synchronization signal (SS) / PBCH block (also referred to as an SS block (SSB)). The MIB provides the number of RBs in the system bandwidth and the system frame number (SFN). The physical downlink shared channel (PDSCH) carries user data, broadcast system information not sent via the PBCH (such as a system information block (SIB)), and paging messages.

[0067] like Figure 2C As illustrated, some of the REs carry DM-RS (indicated as R for a particular configuration, but other DM-RS configurations are possible) for channel estimation at the base station. The UE may send a DM-RS for a physical uplink control channel (PUCCH) and a DM-RS for a physical uplink shared channel (PUSCH). The PUSCH DM-RS may be sent in the first or first two symbols of the PUSCH. Depending on whether a short PUCCH or a long PUCCH is sent and depending on the specific PUCCH format used, the PUCCH DM-RS may be sent in different configurations. The UE may send a sounding reference signal (SRS). The SRS may be sent in the last symbol of a subframe. The SRS may have a comb structure, and the UE may send the SRS on one of the teeth of the comb. The SRS may be used by the base station for channel quality estimation to achieve frequency-dependent scheduling of the UL.

[0068] Figure 2DExamples of various UL channels within a subframe of a frame are illustrated. The PUCCH may be located at a position as indicated in one configuration. The PUCCH carries uplink control information (UCI), such as scheduling requests, channel quality indicators (CQI), precoding matrix indicators (PMI), rank indicators (RI), and hybrid automatic repeat request (HARQ) acknowledgement (ACK) (HARQ-ACK) feedback (i.e., one or more HARQ ACK bits indicating one or more ACKs and / or negative ACKs (NACKs)). The PUSCH carries data and may be used to carry, among other things, buffer status reports (BSRs), power headroom reports (PHRs), and / or UCI.

[0069] Figure 3 370 is a block diagram of a base station 310 communicating with a UE 350 in an access network. In the DL, Internet Protocol (IP) packets may be provided to a controller / processor 375. The controller / processor 375 implements layer 3 and layer 2 functions. Layer 3 includes a radio resource control (RRC) layer, and layer 2 includes a service data adaptation protocol (SDAP) layer, a packet data convergence protocol (PDCP) layer, a radio link control (RLC) layer, and a medium access control (MAC) layer. The controller / processor 375 provides RRC layer functions associated with broadcasting of system information (e.g., MIB, SIB), RRC connection control (e.g., RRC connection paging, RRC connection establishment, RRC connection modification, and RRC connection release), inter-radio access technology (RAT) mobility, and measurement configuration for UE measurement reporting; PDCP layer functions associated with header compression / decompression, security (encryption, decryption, integrity protection, integrity verification), and handover support functions; RLC layer functions associated with delivery of upper layer packet data units (PDUs), error correction through ARQ, concatenation, segmentation and reassembly of RLC service data units (SDUs), re-segmentation of RLC data PDUs, and reordering of RLC data PDUs; and MAC layer functions associated with mapping between logical channels and transport channels, multiplexing of MAC SDUs onto transport blocks (TBs), demultiplexing of MAC SDUs from TBs, scheduling information reporting, error correction through HARQ, priority handling, and logical channel prioritization.

[0070] The transmit (TX) processor 316 and the receive (RX) processor 370 implement layer 1 functions associated with various signal processing functions. Layer 1 (which includes the physical (PHY) layer) may include error detection on the transmission channel, forward error correction (FEC) decoding / decoding of the transmission channel, interleaving, rate matching, mapping to the physical channel, modulation / demodulation of the physical channel, and MIMO antenna processing. The TX processor 316 handles the mapping to the signal constellation based on various modulation schemes (e.g., binary phase shift keying (BPSK), quadrature phase shift keying (QPSK), M-order phase shift keying (M-PSK), M-order quadrature amplitude modulation (M-QAM)). The decoded and modulated symbols can then be divided into parallel streams. Subsequently, each stream can be mapped to an OFDM subcarrier, multiplexed with a reference signal (e.g., a pilot) in the time domain and / or frequency domain, and then combined using an inverse fast Fourier transform (IFFT) to produce a physical channel carrying a time domain OFDM symbol stream. The OFDM stream is spatially pre-coded to generate multiple spatial streams. Channel estimates from a channel estimator 374 may be used to determine the coding and modulation schemes, as well as for spatial processing. Channel estimates may be derived from reference signals and / or channel state feedback sent by the UE 350. Each spatial stream may then be provided to a different antenna 320 via a separate transmitter 318Tx. Each transmitter 318Tx may modulate a radio frequency (RF) carrier for transmission using a corresponding spatial stream.

[0071] At the UE 350, each receiver 354Rx receives a signal through its corresponding antenna 352. Each receiver 354Rx recovers the information modulated onto the RF carrier and provides the information to a receive (RX) processor 356. The TX processor 368 and the RX processor 356 implement layer 1 functions associated with various signal processing functions. The RX processor 356 can perform spatial processing on the information to recover any spatial streams destined for the UE 350. If multiple spatial streams are destined for the UE 350, they can be merged into a single OFDM symbol stream by the RX processor 356. The RX processor 356 then converts the OFDM symbol stream from the time domain to the frequency domain using a fast Fourier transform (FFT). The frequency domain signal includes a separate OFDM symbol stream for each subcarrier of the OFDM signal. The symbols on each subcarrier and the reference signal are recovered and demodulated by determining the most likely signal constellation point sent by the base station 310. These soft decisions can be based on channel estimates calculated by the channel estimator 358. The soft decisions are then decoded and deinterleaved to recover the data and control signals originally sent on the physical channel by base station 310. The data and control signals are then provided to controller / processor 359, which implements layer 3 and layer 2 functionality.

[0072] The controller / processor 359 may be associated with a memory 360 that stores program codes and data. The memory 360 may be referred to as a computer readable medium. In the UL, the controller / processor 359 provides demultiplexing between transport channels and logical channels, packet reassembly, decryption, header decompression, and control signal processing to recover IP packets. The controller / processor 359 is also responsible for error detection using ACK and / or NACK protocols to support HARQ operations.

[0073] Similar to the functions described in conjunction with DL transmission performed by the base station 310, the controller / processor 359 provides RRC layer functions associated with system information (e.g., MIB, SIB) acquisition, RRC connection, and measurement reporting; PDCP layer functions associated with header compression / decompression and security (encryption, decryption, integrity protection, integrity verification); RLC layer functions associated with delivery of upper layer PDUs, error correction through ARQ, concatenation, segmentation and reassembly of RLC SDUs, resegmentation of RLC data PDUs, and reordering of RLC data PDUs; and MAC layer functions associated with mapping between logical channels and transport channels, multiplexing of MAC SDUs onto TBs, demultiplexing of MAC SDUs from TBs, scheduling information reporting, error correction through HARQ, priority handling, and logical channel prioritization.

[0074] The TX processor 368 may use channel estimates derived by the channel estimator 358 from a reference signal or feedback sent by the base station 310 to select appropriate coding and modulation schemes and to facilitate spatial processing. The spatial streams generated by the TX processor 368 may be provided to different antennas 352 via corresponding transmitters 354Tx. Each transmitter 354Tx may modulate an RF carrier with a corresponding spatial stream for transmission.

[0075] UL transmissions are processed at the base station 310 in a manner similar to that described in conjunction with the receiver functionality at the UE 350. Each receiver 318Rx receives a signal through its respective antenna 320. Each receiver 318Rx recovers information modulated onto an RF carrier and provides the information to the RX processor 370.

[0076] The controller / processor 375 may be associated with a memory 376 that stores program codes and data. The memory 376 may be referred to as a computer readable medium. In the UL, the controller / processor 375 provides demultiplexing between transport channels and logical channels, packet reassembly, decryption, header decompression, control signal processing to recover IP packets. The controller / processor 375 is also responsible for error detection using ACK and / or NACK protocols to support HARQ operations.

[0077] At least one of the TX processor 368, the RX processor 356, and the controller / processor 359 may be configured to perform operations related to Figure 1 The PTRS density component 198 combines various aspects.

[0078] At least one of the TX processor 316, the RX processor 370, and the controller / processor 375 may be configured to perform operations related to Figure 1 The PTRS density component 199 combines various aspects.

[0079] In NR (e.g., 5G NR), PRTS is defined for both the physical downlink shared channel (PDSCH) and the physical uplink shared channel (PUSCH), and PRTS can be used for phase noise correction. Given that a UE has its own local oscillator (LO) shared across its panels / antennas, even a UE with multiple panels has a common PTRS density without a per-panel (or per-TCI state / per-beam) PTRS density, not to mention collaboration via virtual UEs with distributed panels that do not share a common LO.

[0080] Various aspects presented herein may provide enhancements to support PTRS density evolution for NR. Various aspects presented herein may include, but are not limited to, PTRS density enhancements for per-panel PTRS density at the UE (e.g., separate PTRS density per panel for each of the following: individual UEs, virtual UEs, etc.), and PTRS density enhancements at the network side (e.g., gNB), which, for example, improve communications through phase noise correction on individual panels when the panels / UEs are distributed. Thus, various aspects of this document may achieve such improvements via PTRS density specific implementation and configuration scenarios, where a virtual UE recommends one or more (e.g., multiple) sets of per-panel thresholds for a given SCS and a given frequency band. Thus, the gNB may configure the PTRS density by individually configuring the thresholds for each panel, and the virtual UE may determine the PTRS density in the time domain, frequency domain, and / or sample domain based on the specific panel for TX / RX using the corresponding configured thresholds.

[0081] Figure 4 is a diagram 400 illustrating PTRS density and configuration for wireless communication in a network in various aspects. Diagram 400 includes a configuration block 402 and a PTRS density set 404. PTRS density set 404 may correspond to a DL set 406 and a UL set 408. Diagram 400 is also described with reference to Tables 2-4 below.

[0082] Table 2 shows example values ​​of time density as a function of scheduled MCS for PTRS, and it should be noted that the fourth threshold for time density (corresponding to the maximum MCS index that does not indicate retransmission, i.e., the maximum MCS index that is not the reserved MCS) may not be explicitly configured.

[0083] Scheduling MCS <![CDATA[Time density (L PTRS )]]> <![CDATA[I MCS <ptrs-MCS1]]> PTRS does not exist <![CDATA[ptrs-MCS1<I MCS ≤ptrs-MCS2]]> 4 <![CDATA[ptrs-MCS2<I MCS ≤ptrs-MCS3]]> 2 <![CDATA[ptrs-MCS3<I MCS ≤ptrs-MCS4]]> 1

[0084] Table 2 - PTRS time density / scheduled MCS

[0085] Table 3 shows example values ​​of frequency density as a function of scheduled bandwidth for PTRS.

[0086] Scheduled bandwidth <![CDATA[Time density (K PTRS )]]> <![CDATA[N RB <N RB0 ]]> PTRS does not exist <![CDATA[N RB0 ≤N RB <N RB1 ]]> 2 <![CDATA[N RB1 ≤N RB ]]> 4

[0087] Table 3 - PTRS time density / scheduled bandwidth

[0088] Table 4 shows example PTRS group patterns as a function of scheduled bandwidth.

[0089] Scheduling MCS Number of PTRS groups Number of samples per PTRS group <![CDATA[N RB0 ≤N RB <N RB1 ]]> 2 2 <![CDATA[N RB1 ≤N RB <N RB2 ]]> 2 4 <![CDATA[N RB2 ≤N RB <N RB3 ]]> 4 2 <![CDATA[N RB3 ≤N RB <N RB4 ]]> 4 4 <![CDATA[N RB4 ≤N RB ]]> 8 4

[0090] Table 4 - Bandwidth for PTRS group mode / scheduling

[0091] In NR (e.g., 5G NR), PRTS is defined for both the physical downlink shared channel (PDSCH) and the physical uplink shared channel (PUSCH). PTRS can be sent within the allocated resource blocks (RBs) of PDSCH / PUSCH and can be used for phase noise correction. PTRS does not conflict with demodulation reference signals (DMRS), non-zero power (NZP) CSI-RS, SSB, etc., and the presence of PTRS (and associated parameters) can be configured via RRC.

[0092] The density of PTRS transmissions (e.g., "PTRS density") may be valued with respect to time and / or frequency. That is, the PTRS density may be associated with the spacing between REs that transmit PTRS in the time / frequency domain within the allocated (assigned) time / frequency (or associated with other data in the time / frequency domain). The density in time (e.g., every "L" OFDM symbols) may depend on the MCS and a configurable threshold, and the density in frequency (e.g., every "K" RBs) may depend on the number of scheduled RBs and a configurable threshold. When transform precoding (e.g., transformPrecoding) is enabled by the network (e.g., for PUSCH), a threshold with respect to the number of RBs may determine the number of PTRS samples utilized, and as described above, the threshold may be configured by the network via RRC, such as for Figure 4 As shown in the configuration box 402 in.

[0093] As described above, the UE may recommend a threshold for a frequency band, for example, Figure 4 404 and DL set 406 and UL set 408 in . Based on this recommendation, the RRC configuration for the MCS / RB thresholds can be configured to determine the PTRS density in time and / or frequency. In addition, according to various aspects, the UE can recommend these thresholds to the network for each SCS, and the network can consider the UE recommendation for PTRS configuration (e.g., including configuration thresholds). That is, the time, frequency and / or sample density as a function of the MCS and / or the number of scheduled RBs may depend on the quality of the LO at a given UE. Therefore, various aspects can advantageously utilize the UE in the best positioning to recommend the thresholds for configuration to the network. In various aspects, the UE recommendation / report is made on a per-band basis.

[0094] Figure 5 5 is a diagram 500 illustrating UE cooperation in various aspects. Diagram 500 includes configuration 510, configuration 540, and configuration 570. Each of configuration 510, configuration 540, and configuration 570 shows communication between a network entity (e.g., a gNB) and one or more UEs, as described in further detail below.

[0095] For a given UE form factor, baseband modem capabilities may be higher than RF capabilities. UE relaying allows the creation of virtual UEs with a larger number of antennas, which can be exploited to increase the user experience on the cellular network, for example, by creating a virtual MIMO effect via a larger effective number of antennas at the virtual UE. In the context of virtual UEs, higher RF capabilities may provide benefits for sub-7 GHz and millimeter wave (mmW) implementations, where from a network side point of view, the virtual UE is being served (e.g., as a UE with a distributed panel or distributed antenna set).

[0096] For example, configuration 510 includes a gNB 512, e.g., with 64 antennas 514, communicating via a direct link 516 (e.g., NR-Uu) with a UE 518, e.g., including four (4) antennas 520. Configuration 510 enables the direct link 516 between the gNB 512 and the UE 518 to be 64×4 (e.g., 64 antennas 514 by 4 antennas 520). In contrast, configuration 540 includes a gNB 512 with 64 antennas 514 and three instances of direct links 516 to three UEs (UE 1 542, UE 2 546, and UE 3 550), which are shown as including four (4) antennas, 4 antennas 544, 4 antennas 548, and 4 antennas 552, respectively. In configuration 840, UE 1 542, UE 2 546, and UE 3 550 are configured as virtual UEs 554 in the illustrated configuration and may communicate with each other via one or more side links 556. In this configuration, the gNB 512 serves the virtual UEs 554 and thus enables direct links 516 between the gNB 512 and UE 1 542, UE 2 546, and UE 3 550 of the virtual UEs 554 to be 64×12 (e.g., 64 antennas 514 by 12 antennas (4 antennas 544 plus 4 antennas 548 plus 4 antennas 552)), thereby creating a virtual MIMO effect due to the larger effective number of antennas at the virtual UE 554.

[0097] Configuration 570 also includes a gNB 512 and a direct link 516 wirelessly connected to a virtual UE 580. The virtual UE includes a target UE 572 (with 4 antennas 574) and a UE 2 576 (with 4 antennas 578). The target UE 572 and UE 2 576 can communicate with each other via a wireless connection 582, which can be a PC5 / side link, Wi-Fi, and / or the like. The described aspects of per-panel PTRS density in UE cooperation improve phase noise correction while not affecting UE-to-UE communications, such as between the target UE 572 and UE 2 576 via a side link, Wi-Fi, etc., via the wireless connection 582, even when one UE is targeted.

[0098] Figure 6 is a call flow diagram 600 for wireless communication in various aspects. The call flow diagram 600 illustrates configuring and utilizing per-panel PTRS density in UE cooperation.

[0099] In the illustrated aspect, the UE 602 sends information 606 associated with a PTRS density for each panel in a set of panels associated with the UE 602 to a network node (e.g., a gNB 604 or one or more components of a gNB, BS, and / or the like). In one configuration, the information 606 sent from the UE 602 to the gNB 604 may include, but is not limited to, a recommended threshold for each panel in the set of panels of the UE 602. The gNB 604 generates a configuration for a PTRS threshold, including configuring a configured threshold for determining the PTRS density based on the UE 602 recommended threshold in the information 606 at 608. The gNB 604 sends a configuration 610 associated with a PTRS density for each panel in the set of panels and the UE 602 receives the configuration. In one configuration, the set of panels may be associated with a set of UEs, and in one configuration, the UE 602 may include a set of UEs, which may include a set of relay UEs, wherein the relay UE is a UE that communicates with other UEs to extend / enhance network coverage or enhance RF capabilities of a virtual UE. In one configuration, UE 602 may be a virtual UE.

[0100] In one configuration, the panel set may include a plurality of panels, wherein each panel may be associated with a different UE in the UE set (e.g., in a virtual UE). In various aspects, configuration 610 may include the configured threshold configured at 608. In one configuration, each panel in the panel set may be specified by at least one of an explicit panel identifier (ID), a beam group ID, a transmit configuration indicator (TCI) state group ID, an association with a control resource set (CORESET) group, an association with a sounding reference signal (SRS) resource set, one or more port numbers associated with communication, a code division multiplexing (CDM) group of one or more demodulation reference signal (DMRS) port numbers, an association with a timing advance group (TAG) ID, or a radio network temporary ID (RNTI).

[0101] The UE 602 determines a PTRS density at 612 according to the configuration 610. In aspects, the UE 602 determines the PTRS density based on a comparison between a configured threshold and a modulation and coding scheme (MCS) and / or a number of scheduled RBs of the configuration 610, e.g., as described in Tables 2-4 above. The UE 602 determines at 614 at least one resource element (RE) based on the PTRS density at 612. In one configuration, the RE is determined based on scheduling in time / frequency for the PDSCH and / or PUSCH.

[0102] Based on the PTRS density determined at 612, DL data and / or UL data 616 are communicated between the UE 602 and the gNB 604. In one configuration, the DL data and / or UL data 616 are communicated via a DL PDSCH and a UL PUSCH for one of the set of panels, respectively. In one configuration, the PTRS density for one panel may be based on an MCS and / or a number of scheduled RBs associated with PDSCH reception or PUSCH transmission through one panel (at 612). In one configuration, communicating the DL data and / or UL data 616 may include receiving or transmitting PTRS information, respectively, in the determined at least one RE (at 614). In one configuration, the PDSCH or PUSCH communicated via one panel may include at least a portion of the PDSCH or PUSCH, respectively.

[0103] In one configuration, the DL data communicated (e.g., 616) may include DL data of a PDSCH received on one panel and other downlink data of another PDSCH received on another panel in a panel set. In one configuration, the PDSCH and the other PDSCH completely overlap, partially overlap, or do not overlap with each other in at least one of time or frequency. In one configuration, the PTRS density for the PDSCH received on one panel and the other PTRS density for the other PDSCH received on another panel may be independent of each other. In one configuration, the DL data communicated (e.g., 616) may be based on a multi-transmission and reception point (mTRP) PDSCH transmission framework based on multi-downlink control information (multi-DCI), and the PDSCH and the other PDSCH are each associated with a corresponding control resource set (CORESET) pool index representing one panel and another panel associated with the PDSCH / PUSCH, respectively.

[0104] In one configuration, the communicated DL data (e.g., 616) may include DL data via a PDSCH, wherein the PDSCH may include a first portion received on one panel and may include a second portion received on another panel in a set of panels. In this configuration, a PTRS density for the first portion received on one panel and another PTRS density for the second portion received on another panel may be independent of each other, and the first portion and the second portion may each include at least one transmission. In this configuration, at least one transmission may include a first set of layers and a second set of layers for spatial division multiplexing (SDM) of the PDSCH, wherein the PTRS density of the first set of layers and the other PTRS density of the second set of layers are respectively associated with two sets of PTRS ports that may be independent of each other with respect to at least one of a time domain or a frequency domain. In this configuration, at least one transmission may include a first set of RBs and a second set of RBs for frequency division multiplexing (FDM) of the PDSCH, wherein the PTRS density of the first set of RBs and the other PTRS density of the second set of RBs may be independent of each other with respect to at least one of a time domain or a frequency domain. In this configuration, at least one transmission may include a first set of symbols and a second set of symbols for time division multiplexing (TDM) of a PDSCH, wherein the PTRS density of the first set of symbols and another PTRS density of the second set of symbols may be independent of each other with respect to at least one of a time domain or a frequency domain. In this configuration, at least one transmission may include the same set of layers, RBs, or symbols for a specific implementation of a system frame number (SFN) of a PDSCH, wherein the PTRS density of the same set of layers, RBs, or symbols and another PTRS density of the same set of layers, RBs, or symbols may be independent of each other with respect to at least one of a time domain or a frequency domain. A resource block may be the smallest unit of resource allocation in the wireless communications described herein, wherein a resource element is the smallest unit of a resource block, as similarly noted above with respect to a resource grid and a frame structure.

[0105] In one configuration, the communicated UL data (e.g., 616) may include uplink data via a PUSCH sent on one panel and other uplink data via another PUSCH sent on another panel in a panel set, wherein the PUSCH and the other PUSCH are completely overlapping, partially overlapping, or non-overlapping relative to each other in at least one of time or frequency. In one configuration, the PTRS density for the PUSCH sent on one panel and the other PTRS density for the other PUSCH sent on another panel may be independent of each other. In one configuration, communicating the UL data (e.g., 616) may be based on a multiple transmission and reception point (mTRP) PUSCH transmission framework based on multiple downlink control information (multi-DCI), wherein the PUSCH and the other PUSCH may each be associated with a corresponding control resource set (CORESET) pool index (e.g., coresetPoolIndex) or a sounding reference signal (SRS) resource set representing one panel and the other panel, respectively.

[0106] In one configuration, the communicated UL data (e.g., 616) may include uplink data via a PUSCH, wherein the PUSCH may include a first portion transmitted on one panel and may include a second portion transmitted on another panel in a set of panels, wherein a PTRS density for the first portion transmitted on one panel and another PTRS density for the second portion transmitted on another panel are independent of each other, and wherein the first portion and the second portion may each include at least one transmission. In this configuration, the at least one transmission may include a first set of layers and a second set of layers of the PUSCH for SDM, wherein the PTRS density of the first set of layers and the other PTRS density of the second set of layers are respectively associated with two sets of PTRS ports that are independent of each other with respect to at least one of a time domain, a frequency domain, or a sample domain. In this configuration, the at least one transmission may include a first set of RBs and a second set of RBs of the PUSCH for FDM, wherein the PTRS density of the first set of RBs and the other PTRS density of the second set of RBs are independent of each other with respect to at least one of a time domain or a frequency domain. In this configuration, at least one transmission may include a first set of symbols and a second set of symbols for TDM of a PUSCH, wherein a PTRS density of the first set of symbols and another PTRS density of the second set of symbols are independent of each other with respect to at least one of a time domain or a frequency domain. In this configuration, at least one transmission may include a same set of layers, RBs, or symbols for a specific SFN implementation of a PUSCH, wherein the PTRS density of the same set of layers, RBs, or symbols and another PTRS density of the same set of layers, RBs, or symbols are independent of each other with respect to at least one of a time domain or a frequency domain.

[0107] Figure 7700 is a diagram illustrating a UE panel in various aspects. Figure 5 UE1 542 and UE 2 546 are described. As an example, in the context of UE collaboration, virtual UEs and / or distributed panels / antenna sets, a panel can be a set of antennas for one or more UEs (e.g., one or more UEs and relay UEs included in a virtual UE), where each panel is configured to send / receive wireless signals separately from other panels. In various aspects, a UE and / or virtual UE may include more than one panel, and these panels may be distributed among different UEs included in the virtual UE. In other words, a panel of a UE may generally represent a set of antennas that can form a beam independently of other sets of antennas corresponding to other panels. UE 1 542 includes four antennas 544, and UE 2 546 includes four antennas 548. The four antennas 544 are illustrated in diagram 700 as being configured in two panels: panel 702 having the first two of the four antennas 544, and panel 704 having the second two of the four antennas 544. The four antennas 548 are illustrated in diagram 700 as being configured as a single panel 706. The panel configuration illustrated in diagram 700 is by way of example and not limitation, as it is contemplated herein that a UE may have more or less than four antennas and that a panel may include any number of antennas.

[0108] Figure 8 is a diagram illustrating wireless communications with per-panel PTRS density for a UE panel in various aspects. Figure 8 Three configurations for wireless communication with per-panel PTRS density for UE panels are shown: configuration 810, configuration 840, and configuration 870, wherein each configuration is illustrated by way of example and not limitation with reference to panel (two antennas) 802, panel (two antennas) 804, gNB 806. In the illustrated configurations, panel 802 and panel 804 are distributed panels of a UE included in a virtual UE (not shown for clarity and simplicity of illustration; in Figure 5 548 citations) and may be the above Figure 7 700 depicts various aspects of the panel.

[0109] Configuration 810 shows a configuration in which each communication is a PDSCH / PUSCH. For example, a first PDSCH1 / PUSCH1 812 may be communicated between gNB 806 and panel 802, while a second PDSCH2 / PUSCH2814 (e.g., a different PDSCH / PUSCH) may be communicated between gNB 806 and panel 804. In one configuration, the first PDSCH1 / PUSCH1 812 and the second PDSCH2 / PUSCH2 814 may overlap in whole or in part (816), or may not overlap (818). In configuration 810, panel 802 may have a panel PTRS density A and a CORESET pool index (e.g., coresetPoolIndex0), while panel 804 may have a panel PTRS density B and another CORESET pool index (e.g., coresetPoolIndex1), and panel PTRS density B may be the same as or different from panel PTRS density A. It should be noted that while panel PTRS density A and panel PTRS density B may be the same or different, each panel density is determined specifically for its corresponding panel and PDSCH / PUSCH (e.g., may be independent of each other, as described with respect to various aspects herein), rather than for the number of RBs, different MCSs, etc. In one configuration, the communicated DL data for the PDSCH1 portion of 812 may be based on a multiple transmission and reception point (mTRP) PDSCH transmission framework based on multiple downlink control information (multi-DCI).

[0110] Configuration 840 illustrates a configuration in which each communication is a portion of a PDSCH / PUSCH. For example, a first PDSCH1-A / PUSCH1-A portion 842 may be communicated between gNB 806 and panel 802, and a second PDSCH1-B / PUSCH1-B portion 844 may be communicated between gNB 806 and panel 804. In configuration 840, panel 802 may have a panel PTRS density C, and panel 804 may have a panel PTRS density D, which may be the same as or different from the panel PTRS density C. In one configuration, the first PDSCH1-A / PUSCH1-A portion 842 and the second PDSCH1-B / PUSCH1-B portion 844 may be a first set of layers and a second set of layers for SDM of a PDSCH / PUSCH, respectively, wherein the panel PTRS density C and the panel PTRS density D are respectively associated with two sets of PTRS ports that may be independent of each other with respect to at least one of a time domain or a frequency domain. In one configuration, the first PDSCH1-A / PUSCH1-A portion 842 and the second PDSCH1-B / PUSCH1-B portion 844 may be a first set of RBs and a second set of RBs for FDM of the PDSCH / PUSCH, respectively, wherein the panel PTRS density C and the panel PTRS density D may be independent of each other with respect to at least one of the time domain or the frequency domain. In one configuration, the first PDSCH1-A / PUSCH1-A portion 842 and the second PDSCH1-B / PUSCH1-B portion 844 may be a first set of symbols and a second set of symbols for TDM of the PDSCH, respectively, wherein the PTRS density of the first set of symbols and another PTRS density of the second set of symbols may be independent of each other with respect to at least one of the time domain or the frequency domain.

[0111] Configuration 870 illustrates a configuration where each communication is a portion of a PDSCH / PUSCH. For example, a PDSCH1 / PUSCH1 portion 872 may be communicated between gNB 806 and panel 802, and a PDSCH1 / PUSCH1 portion 872 may also be communicated between gNB 806 and panel 804. In configuration 870, panel 802 may have a panel PTRS density E, and panel 804 may have a panel PTRS density F, which may be the same as or different from panel PTRS density E. In one configuration, the PDSCH1 / PUSCH1 portion 872 may be the same set of layers, RBs, or symbols of a PDSCH / PUSCH, respectively, for a specific SFN implementation, wherein the panel PTRS density E and the panel PTRS density F may be independent of each other with respect to at least one of the time domain or the frequency domain.

[0112] It should be noted that in Figure 8In all cases illustrated in diagram 800 in FIG. 8 , the PDSCH / PUSCH may have two (or more) different PTRS densities for a panel (e.g., a distributed panel: panel 802 and panel 804) based on corresponding configured thresholds, as described herein. Additionally, for the described and depicted UL (e.g., PUSCH) scenarios / configurations, the SRS may represent and / or determine an association with a panel.

[0113] Fig. 9 900 is a flowchart of a method of wireless communication according to various aspects of the present disclosure. The method may be performed by a UE (e.g., UE 104, 602; device 1304). At 902, the UE sends information associated with a PTRS density for each panel in a set of panels associated with the UE. In some aspects, 902 may be performed by component 198. Additionally, at 904, the UE receives a configuration associated with a PTRS density for each panel in the set of panels from a network entity. In some aspects, 904 may be performed by component 198. Finally, at 906, the UE communicates downlink data via a PDSCH or uplink data via a PUSCH based on the PTRS density for one panel in the set of panels, based on the configuration, wherein the PTRS density for one panel in the set of panels is based on at least one of an MCS or a number of scheduled RBs associated with a PDSCH reception or a PUSCH transmission by one panel. In some aspects, 906 may be performed by component 198. For example, referring to Figure 6 , the UE 602 may send information 606 associated with a PTRS density for each panel in a set of panels associated with the UE. The information 606 associated with a PTRS density for each panel may be sent to the gNB 604 and may include a UE-recommended threshold for PTRS density for each panel (e.g., as described above in Tables 2-4). In various aspects, the UE may be a virtual UE (e.g., a set of UEs having distributed panels (e.g., antenna sets for each UE in the set) Figure 5 554; Figure 8 802, 804 shown in FIG. 802, 804). In addition, Figure 6 Configuration 610 in information 606 may include a threshold configured by gNB 604 for PTRS density based on the UE recommended threshold in information 606. In various aspects, DL data and / or UL data 616 communicated between UE 602 and gNB 604 based on the determined PTRS density may be communicated via PDSCH / PUSCH and may include separate PDSCH / PUSCH (e.g., Figure 8 812 / 814) or each part of PDSCH / PUSCH ( Figure 8 842 / 844, 872).

[0114] Fig.10 1000 is a flow chart of a method of wireless communication according to various aspects of the present disclosure. The method may be performed by a UE (e.g., UE 104, 602; device 1304). At 1002, the UE sends information associated with a PTRS density for each panel in a set of panels associated with the UE. In some aspects, 1002 may be performed by component 198. At 1004, the UE receives a configuration associated with a PTRS density for each panel in the set of panels from a network entity. In some aspects, 1004 may be performed by component 198. Additionally, at 1006, the UE determines a PTRS density based on the configuration based on a comparison. In some aspects, 1006 may be performed by component 198. Furthermore, at 1008, the UE determines a PTRS density based on the configuration based on a comparison. In some aspects, 1008 may be performed by component 198. Finally, at 1010, the UE communicates downlink data via the PDSCH or uplink data via the PUSCH based on a PTRS density for one of the panels in the set of panels based on the configuration, wherein the PTRS density for one of the panels in the set of panels is based on at least one of an MCS or a number of scheduled RBs associated with PDSCH reception or PUSCH transmission through the one panel. In some aspects, 1010 may be performed by component 198.

[0115] For example, refer again to Figure 6 , UE 602 may send information 606 associated with a PTRS density for each panel in a set of panels associated with the UE. Information 606 associated with a PTRS density for each panel may be sent to gNB 604 and may include a UE-recommended threshold for PTRS density for each panel (e.g., as described above in Tables 2-4). In various aspects, the UE may be a virtual UE (e.g., a set of UEs having distributed panels (e.g., antenna sets for each UE in the set) Figure 5 554; Figure 8 802, 804 shown in FIG. 802, 804). In addition, Figure 6The configuration 610 in the information 606 may include a threshold configured by the gNB 604 for the PTRS density based on the UE recommended threshold in the information 606. Utilizing the configuration 610 associated with the PTRS density for each panel, the UE may determine the PTRS density per panel / band based on a comparison between the configured threshold in the configuration 610 and the MCS and / or the number of scheduled RBs at 612 (e.g., as described above in Tables 2-4). The UE may then determine at 614 at least one RE based on the PTRS density for transmission / reception of wireless communication. In various aspects, DL data and / or UL data 616 communicated between the UE 602 and the gNB 604 based on the determined PTRS density may be communicated via the PDSCH / PUSCH and may include a separate PDSCH / PUSCH (e.g., Figure 8 812 / 814) or each part of PDSCH / PUSCH ( Figure 8 In various aspects, the communication of DL data and / or UL data 616 may include PTRS information received / sent in the REs determined at 614.

[0116] Fig.11 1100 is a flow chart of a method of wireless communication according to various aspects of the present disclosure. The method may be performed by a network entity, a base station, or a gNB (e.g., base station 102; gNB 604, gNB 806; network entity 1302, 1402). At 1102, the network entity receives from a UE information associated with a PTRS density for each panel in a set of panels associated with the UE. For example, as described with respect to Figure 6 As described, the gNB 604 may receive information 606 associated with a PTRS density for each panel in a set of panels associated with the UE. The information 606 associated with a PTRS density for each panel may be received by the gNB 604 from the UE 602 and may include a UE-recommended threshold for the PTRS density for each panel (e.g., as described above in Tables 2-4). In various aspects, the UE may be a virtual UE (e.g., a set of UEs having distributed panels (e.g., antenna sets for each UE in the set) Figure 5 554; Figure 8 In some aspects, 1102 may be performed by component 199. Additionally, at 1104, the network entity sends, for the UE, a configuration associated with a PTRS density for each panel in the panel set. For example, referring to Figure 6 , Figure 6The configuration 610 in the information 606 may include a threshold configured by the gNB 604 for the PTRS density based on the UE 602 recommended threshold in the information 606. In some aspects, 1104 may be performed by component 199. Finally, at 1106, the network entity communicates downlink data via the PDSCH or uplink data via the PUSCH with the UE based on the PTRS density for one of the panels in the set of panels based on the configuration, wherein the PTRS density for one of the panels in the set of panels is based on at least one of an MCS or a number of scheduled RBs associated with a PDSCH reception or a PUSCH transmission through the one panel. For example, referring to Figure 6 In various aspects, DL data and / or UL data 616 communicated between UE 602 and gNB 604 based on the PTRS density determined using configuration 610 may be communicated via PDSCH / PUSCH and may include separate PDSCH / PUSCH (e.g., Figure 8 812 / 814) or each part of PDSCH / PUSCH ( Figure 8 842 / 844, 872). In some aspects, 1106 may be performed by component 199.

[0117] Fig.12 1200 is a flow chart of a method of wireless communication according to various aspects of the present disclosure. The method may be performed by a network entity, a base station, or a gNB (e.g., base station 102; gNB 604, gNB 806; network entity 1302, 1402). At 1202, the network entity receives information associated with a PTRS density for each panel in a set of panels associated with the UE from a UE. For example, again referring to Figure 6 , the gNB 604 may receive information 606 associated with a PTRS density for each panel in a set of panels associated with the UE. The information 606 associated with a PTRS density for each panel may be received by the gNB 604 from the UE 602 and may include a UE-recommended threshold for PTRS density for each panel (e.g., as described above in Tables 2-4). In various aspects, the UE may be a virtual UE (e.g., a set of UEs having distributed panels (e.g., antenna sets for each UE in the set) Figure 5 554; Figure 8 802, 804 represented in ). In some aspects, 1202 may be performed by component 199. At 1204, the network entity may configure a configured threshold based on the UE recommended threshold for determining PTRS density. For example, referring to Figure 6 , gNB 604 may configure a (configured) threshold for determining PTRS density based on the UE recommended threshold in information 606 at 608. In some aspects, 1204 may be performed by component 199.

[0118] Additionally, at 1206, the network entity sends, to the UE, a configuration associated with a PTRS density for each panel in the panel set. Figure 6 , configuration 610 may be sent to UE 602 and may include a configured threshold value configured by gNB 604 for PTRS density based on the UE recommended threshold value at 608. In some aspects, 1206 may be performed by component 199. In addition, at 1208, the network entity may receive an indication of at least one determined RE based on PTRS density. For example, referring to Figure 6 , and as described above, the UE 602 may determine one or more REs based on the PTRS density in which to receive / send PTRS information at 614, and the gNB 604 may receive an indication of the one or more REs from the UE 602. In some aspects, 1208 may be performed by component 199. Finally, at 1210, the network entity communicates downlink data via PDSCH or uplink data via PUSCH with the UE based on the PTRS density for one of the panels in the panel set based on the configuration, wherein the PTRS density for one of the panels in the panel set is based on at least one of an MCS or a number of scheduled RBs associated with PDSCH reception or PUSCH transmission through the one panel. For example, with reference to Figure 6 In various aspects, DL data and / or UL data 616 communicated between UE 602 and gNB 604 based on the PTRS density determined using configuration 610 may be communicated via PDSCH / PUSCH and may include separate PDSCH / PUSCH (e.g., Figure 8 812 / 814) or each part of PDSCH / PUSCH ( Figure 8 842 / 844, 872). In some aspects, 1210 may be performed by component 199.

[0119] Fig.131300 is a diagram illustrating an example of a hardware implementation for an apparatus 1304. The apparatus 1304 may be a UE, a component of a UE, or may implement UE functionality. In some aspects, the apparatus 1304 may include a cellular baseband processor 1324 (also referred to as a modem) coupled to one or more transceivers 1322 (e.g., a cellular RF transceiver). The cellular baseband processor 1324 may include on-chip memory 1324'. In some aspects, the apparatus 1304 may also include one or more subscriber identity module (SIM) cards 1320 and an application processor 1306 coupled to a secure digital (SD) card 1308 and a screen 1310. The application processor 1306 may include on-chip memory 1306'. In some aspects, the device 1304 may also include a Bluetooth module 1312, a WLAN module 1314, an SPS module 1316 (e.g., a GNSS module), one or more sensor modules 1318 (e.g., an atmospheric pressure sensor / altimeter; a motion sensor such as an inertial measurement unit (IMU), a gyroscope, and / or an accelerometer; light detection and ranging (LIDAR), radio-aided detection and ranging (RADAR), sound navigation and ranging (SONAR), a magnetometer, audio, and / or other technologies for positioning), an additional memory module 1326, a power source 1330, and / or a camera 1332. The Bluetooth module 1312, the WLAN module 1314, and the SPS module 1316 may include an on-chip transceiver (TRX) (or in some cases, only a receiver (RX)). The Bluetooth module 1312, the WLAN module 1314, and the SPS module 1316 may include their own dedicated antennas and / or communicate using an antenna 1380. The cellular baseband processor 1324 communicates with the UE 104 and / or the RU associated with the network entity 1302 through the transceiver 1322 via one or more antennas 1380. The cellular baseband processor 1324 and the application processor 1306 may each include a computer-readable medium / memory 1324', 1306', respectively. The additional memory module 1326 may also be considered a computer-readable medium / memory. Each computer-readable medium / memory 1324', 1306', 1326 may be non-transitory. The cellular baseband processor 1324 and the application processor 1306 are each responsible for general processing, including executing software stored on a computer-readable medium / memory. The software, when executed by the cellular baseband processor 1324 / application processor 1306, enables the cellular baseband processor 1324 / application processor 1306 to perform the various functions described above. The computer-readable medium / memory may also be used to store data manipulated by the cellular baseband processor 1324 / application processor 1306 when executing the software.The cellular baseband processor 1324 / application processor 1306 may be a component of the UE 350 and may include the memory 360 and / or at least one of the TX processor 368, the RX processor 356, and the controller / processor 359. In one configuration, the device 1304 may be a processor chip (modem and / or application) and include only the cellular baseband processor 1324 and / or the application processor 1306, while in another configuration, the device 1304 may be the entire UE (e.g., see. Figure 3 350) and includes additional modules of device 1304.

[0120] As discussed above, component 198 is configured to send information associated with a PTRS density for each panel in a set of panels associated with the UE. Additionally, component 198 is configured to receive a configuration associated with a PTRS density for each panel in the set of panels from a network entity. Additionally, component 198 is configured to communicate downlink data via the PDSCH or uplink data via the PUSCH based on the PTRS density for one panel in the set of panels based on the configuration, wherein the PTRS density for one panel in the set of panels is based on at least one of an MCS or a number of scheduled RBs associated with a PDSCH reception or a PUSCH transmission by one panel. In various aspects, component 198 may be configured to determine the PTRS density based on the configuration based on a comparison. In some aspects, component 198 may be configured to determine the PTRS density based on the configuration based on a comparison. Component 198 may be further configured to perform in conjunction with Fig. 9 , Fig.10 , Fig.11 , Fig.12 Described and / or by Figure 61304. The device 1304 may include any of the aspects performed by the UE 602 in the embodiment of the present invention. The component 198 may be within the cellular baseband processor 1324, the application processor 1306, or both the cellular baseband processor 1324 and the application processor 1306. The component 198 may be one or more hardware components specifically configured to perform the stated process / algorithm, implemented by one or more processors configured to perform the stated process / algorithm, stored in a computer-readable medium for implementation by one or more processors, or some combination thereof. As shown, the device 1304 may include a variety of components configured for various functions. In one configuration, the device 1304 (and in particular the cellular baseband processor 1324 and / or the application processor 1306) includes a component for sending information associated with a PTRS density for each panel in a set of panels associated with the UE. In one configuration, the device 1304 (and in particular the cellular baseband processor 1324 and / or the application processor 1306) includes a component for receiving a configuration associated with a PTRS density for each panel in a set of panels from a network entity. In one configuration, the device 1304, and in particular the cellular baseband processor 1324 and / or the application processor 1306. The device 1304 (and in particular the cellular baseband processor 1324 and / or the application processor 1306) may include a processor for performing a combined Fig. 9 , Fig.10 , Fig.11 , Fig.12 Described and / or by Figure 6 1304. A component may be a component 198 of the apparatus 1304 configured to perform the functions recited by the component. As described above, the apparatus 1304 may include a TX processor 368, an RX processor 356, and a controller / processor 359. Thus, in one configuration, the component may be a TX processor 368, an RX processor 356, and / or a controller / processor 359 configured to perform the functions recited by the component.

[0121] Fig.141400 is a diagram illustrating an example of a hardware implementation for a network entity 1402. The network entity 1402 may be a BS, a component of a BS, or may implement BS functionality. The network entity 1402 may include at least one of a CU 1410, a DU 1430, or a RU 1440. For example, depending on the layer functionality handled by the component 199, the network entity 1402 may include a CU 1410; both the CU 1410 and the DU 1430; each of the CU 1410, the DU 1430, and the RU 1440; the DU 1430; both the DU 1430 and the RU 1440; or the RU 1440. The CU 1410 may include a CU processor 1412. The CU processor 1412 may include an on-chip memory 1412'. In some aspects, the CU 1410 may also include an additional memory module 1414 and a communication interface 1418. CU 1410 communicates with DU 1430 via a midhaul link, such as an F1 interface. DU 1430 may include a DU processor 1432. DU processor 1432 may include on-chip memory 1432'. In some aspects, DU 1430 may also include an additional memory module 1434 and a communication interface 1438. DU 1430 communicates with RU 1440 via a fronthaul link. RU 1440 may include a RU processor 1442. RU processor 1442 may include on-chip memory 1442'. In some aspects, RU 1440 may also include an additional memory module 1444, one or more transceivers 1446, an antenna 1480, and a communication interface 1448. RU 1440 communicates with UE 104. On-chip memory 1412', 1432', 1442' and additional memory modules 1414, 1434, 1444 may each be considered a computer-readable medium / memory. Each computer readable medium / memory may be non-transitory. Each of processors 1412, 1432, 1442 is responsible for general processing, including executing software stored on the computer readable medium / memory. The software, when executed by the corresponding processor, causes the processor to perform the various functions described above. The computer readable medium / memory may also be used to store data manipulated by the processor when executing the software.

[0122] As discussed above, component 199 is configured to receive, from the UE, information associated with a PTRS density for each panel in a set of panels associated with the UE. Additionally, component 199 is configured to send, to the UE, a configuration associated with a PTRS density for each panel in the set of panels. Additionally, component 199 is configured to communicate, with the UE, downlink data via the PDSCH or uplink data via the PUSCH based on the PTRS density for one panel in the set of panels, based on the configuration, wherein the PTRS density for one panel in the set of panels is based on at least one of an MCS or a number of scheduled RBs associated with a PDSCH reception or a PUSCH transmission through one panel. Additionally, component 199 may be configured to configure a configured threshold for determining the PTRS density based on a UE recommended threshold, and may be configured to receive an indication of at least one determined RE based on the PTRS density. Component 199 may be further configured to perform a combined Fig. 9 , Fig.10 , Fig.11 , Fig.12 Described and / or by Figure 6 Any of the aspects performed by the gNB 604 in . Component 199 may be within one or more processors of one or more of CU1410, DU 1430, and RU 1440. Component 199 may be one or more hardware components specifically configured to perform the stated process / algorithm, implemented by one or more processors configured to perform the stated process / algorithm, stored in a computer-readable medium for implementation by one or more processors, or some combination thereof. Network entity 1402 may include a variety of components configured for various functions. In one configuration, network entity 1402 includes components for receiving, from a UE, information associated with a PTRS density for each panel in a set of panels associated with the UE. In one configuration, network entity 1402 includes components for sending, to the UE, a configuration associated with a PTRS density for each panel in a set of panels. In one configuration, the network entity 1402 includes means for communicating downlink data via the PDSCH or uplink data via the PUSCH with the UE based on a PTRS density for one of the panels in the set of panels based on the configuration, wherein the PTRS density for one of the panels in the set of panels is based on at least one of an MCS or a number of scheduled RBs associated with PDSCH reception or PUSCH transmission through the one panel. Additionally, in one configuration, the network entity 1402 may include means for configuring a threshold configured based on a UE recommended threshold for determining the PTRS density, and for receiving an indication of at least one determined RE based on the PTRS density. The network entity 1402 may include means for performing a combined Fig. 9 , Fig.10 , Fig.11 , Fig.12 Described and / or by Figure 6 A means for any of the aspects performed by the gNB 604 in the embodiment of the present invention. A means may be a component 199 of the network entity 1402 configured to perform the functions recited by the means. As described above, the network entity 1402 may include a TX processor 316, an RX processor 370, and a controller / processor 375. Thus, in one configuration, a means may be a TX processor 316, an RX processor 370, and / or a controller / processor 375 configured to perform the functions recited by the means.

[0123] Some aspects of wireless communications (e.g., NR, 5G NR, etc.) define PRTS for both the physical downlink shared channel (PDSCH) and the physical uplink shared channel (PUSCH), but do not utilize PRTS in a per-panel configuration. Additionally, UE collaboration via virtual UEs with distributed panels enables improved RF capabilities, however the UEs in the collaboration do not share a local oscillator and therefore cannot obtain phase noise correction on a per-panel basis. The described aspects of per-panel PTRS density for a panel / antenna set for a UE (including a virtual UE) provide the ability to configure and utilize distributed panels with corresponding PTRS densities based on UE recommendations for PTRS thresholds for each frequency band. The various aspects presented herein may provide enhancements to support PTRS density evolution for NR, and include, but are not limited to, PTRS density enhancements for per-panel PTRS density at the UE (e.g., separate PTRS density per panel for each of the following: each UE, virtual UE, etc.), and PTRS density enhancements at the network side (e.g., gNB), which, for example, improve communications by phase noise correction on each panel when the panel / UE is distributed. Thus, various aspects herein may achieve such improvements via PTRS density specific implementation and configuration scenarios, where a virtual UE recommends one or more (e.g., multiple) sets of per-panel thresholds for a given SCS and a given frequency band. Thus, the gNB may configure the PTRS density by configuring the thresholds for each panel individually, and the virtual UE may determine the PTRS density in the time domain, frequency domain, and / or sample domain based on a specific panel for TX / RX using the corresponding configured thresholds.

[0124] It should be understood that the specific order or hierarchy of the blocks in the disclosed process / flowchart is merely an illustration of the exemplary method. It should be understood that the specific order or hierarchy of the blocks in the process / flowchart may be rearranged based on design preferences. Further, some blocks may be combined or omitted. The attached method claims provide the elements of the various blocks in a sample order, but are not limited to the specific order or hierarchy provided.

[0125] The foregoing description is provided to enable any person skilled in the art to practice the various aspects described herein. Various modifications to these aspects will be apparent to those skilled in the art, and the general principles defined herein may be applied to other aspects. Therefore, the claims are not limited to the various aspects described herein, but should be given the full scope consistent with the language claims. Unless otherwise specified, reference to an element in the singular form does not mean "one and only one", but "one or more". Terms such as "if", "when" and "while" do not mean a direct temporal relationship or reaction. That is, these phrases, such as "when ......", do not mean an immediate action in response to the occurrence of an action or during the occurrence of an action, but simply imply that if the conditions are met, then the action will occur, but no specific or immediate time limit is required for the occurrence of the action. The word "exemplary" is used herein to mean "used as an example, instance or illustration". Any aspect described as "exemplary" herein is not necessarily interpreted as being preferred or having advantages over other aspects. Unless otherwise specified, the term "some" refers to one or more. Combinations such as "at least one of A, B, or C", "one or more of A, B, or C", "at least one of A, B and C", "one or more of A, B, and C", and "A, B, C, or any combination thereof" include any combination of A, B, and / or C, which may include multiple A, multiple B, or multiple C. Specifically, combinations such as "at least one of A, B, or C", "one or more of A, B, or C", "at least one of A, B, and C", "one or more of A, B, and C", and "A, B, C, or any combination thereof" may be only A, only B, only C, A and B, A and C, B and C, or A and B and C, where any such combination may contain one or more members of A, B, or C. A set should be interpreted as a set of elements, where the number of elements is one or more. Thus, for a set of X, X will include one or more elements. If the first device receives data from the second device or sends data to the second device, the data may be received / sent directly between the first device and the second device, or indirectly between the first device and the second device through a collection of devices. All structural and functional equivalents of the elements of the various aspects described throughout the present disclosure that are known or will later be known to a person of ordinary skill in the art are expressly incorporated herein by reference and are covered by the claims. In addition, nothing disclosed herein is intended to be dedicated to the public, regardless of whether such disclosure is explicitly stated in the claims. Words such as "module", "mechanism", "element", "device", etc. cannot replace the word "component". Therefore, no claim element will be understood as a component plus function unless the element is explicitly stated using the phrase "component for..."

[0126] As used herein, the phrase "based on" should not be interpreted as referring to a closed set of information, one or more conditions, one or more factors, etc. In other words, the phrase "based on A" (where "A" can be information, conditions, factors, etc.) should be interpreted as "based at least on A" unless specifically stated differently.

[0127] The following aspects are merely illustrative and may be combined with other aspects or teachings described herein without limitation.

[0128] Aspect 1 is an apparatus for wireless communication at a user equipment (UE) or a wireless device, comprising a memory and at least one processor coupled to the memory, and based at least in part on information stored in the memory, the at least one processor is configured to: send information associated with a phase tracking reference signal (PTRS) density for each panel in a set of panels associated with the UE; receive a configuration associated with the PTRS density for each panel in the set of panels from a network entity; and based on the configuration, communicate downlink data via a physical downlink shared channel (PDSCH) or uplink data via a physical uplink shared channel (PUSCH) based on the PTRS density for one panel in the set of panels, wherein the PTRS density for the one panel in the set of panels is based on at least one of a modulation and coding scheme (MCS) or a number of scheduled resource blocks (RBs) associated with PDSCH reception or PUSCH transmission by the one panel.

[0129] Aspect 2 is an apparatus according to aspect 1, wherein the panel set is associated with a UE set, wherein the UE includes the UE set, and the UE set includes a relay UE set.

[0130] Aspect 3 is an apparatus according to any one of aspects 1 and 2, wherein the panel set includes a plurality of panels, and wherein each panel is associated with a different UE in the UE set.

[0131] Aspect 4 is an apparatus according to any one of Aspects 1 to 3, wherein the information includes a threshold associated with the PTRS density, and wherein the PTRS density is based on a comparison between the threshold and the MCS or the number of scheduled RBs.

[0132] Aspect 5 is an apparatus according to Aspect 4, wherein the threshold associated with the PTRS density included in the information is a UE recommended threshold for each panel in the panel set, and wherein the configuration includes a configured threshold associated with the UE recommended threshold for each panel in the panel set, and the at least one processor is further configured to: determine the PTRS density according to the configuration based on the comparison.

[0133] Aspect 6 is an apparatus according to any one of aspects 1 to 5, wherein the PDSCH or the PUSCH communicated via the one panel includes at least a portion of the PDSCH or the PUSCH, respectively.

[0134] Aspect 7 is an apparatus according to any one of Aspects 1 to 6, wherein the at least one processor is further configured to: determine at least one resource element (RE) based on the PTRS density; wherein the apparatus also includes at least one transceiver coupled to the at least one processor, and wherein in order to convey the downlink data via the PDSCH or the uplink data via the PUSCH based on the configuration, the at least one processor is configured to: receive or send PTRS information in the determined at least one RE, respectively, via the at least one transceiver.

[0135] Aspect 8 is an apparatus according to any one of Aspects 1 to 7, wherein each panel in the panel set is specified by at least one of an explicit panel identifier (ID), a beam group ID, a transmit configuration indicator (TCI) state group ID, an association with a control resource set (CORESET) group, an association with a sounding reference signal (SRS) resource set, one or more port numbers associated with the communication, a code division multiplexing (CDM) group of one or more demodulation reference signal (DMRS) port numbers, an association with a timing advance group (TAG) ID, or a radio network temporary ID (RNTI).

[0136] Aspect 9 is a device according to any one of Aspects 1 to 8, wherein the communicated downlink data includes the downlink data via the PDSCH received on the one panel and other downlink data via another PDSCH received on another panel in the panel set, wherein the PDSCH and the another PDSCH completely overlap, partially overlap or do not overlap with each other in at least one of time or frequency, and wherein the PTRS density for the PDSCH received on the one panel and the other PTRS density for the another PDSCH received on the other panel are independent of each other.

[0137] Aspect 10 is an apparatus according to Aspect 9, wherein the communicated downlink data is based on a multiple transmission and reception point (mTRP) PDSCH transmission framework based on multiple downlink control information (multi-DCI), and wherein the PDSCH and the other PDSCH are each associated with a corresponding control resource set (CORESET) pool index representing the one panel and the other panel respectively.

[0138] Aspect 11 is an apparatus according to any one of Aspects 1 to 10, wherein the communicated downlink data includes the downlink data via the PDSCH, wherein the PDSCH includes a first part received on the one panel and includes a second part received on another panel in the panel set, wherein the PTRS density for the first part received on the one panel and another PTRS density for the second part received on the other panel are independent of each other, and wherein the first part and the second part respectively include at least one of the following items: a first set of layers and a second set of layers for spatial division multiplexing (SDM) of the PDSCH, wherein the PTRS density of the first set of layers and the other PTRS density of the second set of layers are respectively independent of each other with respect to PTRS ports in at least one of the time domain or the frequency domain. Two sets are associated; a first set of RBs and a second set of RBs of the PDSCH for frequency division multiplexing (FDM), wherein the PTRS density of the first set of RBs and the other PTRS density of the second set of RBs are independent of each other with respect to at least one of the time domain or the frequency domain; a first set of symbols and a second set of symbols of the PDSCH for time division multiplexing (TDM), wherein the PTRS density of the first set of symbols and the other PTRS density of the second set of symbols are independent of each other with respect to at least one of the time domain or the frequency domain; or the same set of layers, RBs or symbols of the PDSCH for a specific implementation of a system frame number (SFN), wherein the PTRS density of the same set of layers, RBs or symbols and the other PTRS density of the same set of layers, RBs or symbols are independent of each other with respect to at least one of the time domain or the frequency domain.

[0139] Aspect 12 is an apparatus according to any one of Aspects 1 to 8, wherein the communicated uplink data includes the uplink data via the PUSCH sent on the one panel and other uplink data via another PUSCH sent on another panel in the panel set, wherein the PUSCH and the another PUSCH completely overlap, partially overlap or do not overlap with each other in at least one of time or frequency, and wherein the PTRS density for the PUSCH sent on the one panel and the other PTRS density for the another PUSCH sent on the other panel are independent of each other.

[0140] Aspect 13 is an apparatus according to Aspect 12, wherein the communication is based on a multiple transmission and reception point (mTRP) PUSCH transmission framework based on multiple downlink control information (multi-DCI), and wherein the PUSCH and the other PUSCH are each associated with a corresponding control resource set (CORESET) pool index or a sounding reference signal (SRS) resource set representing the one panel and the other panel, respectively.

[0141] Aspect 14 is an apparatus according to any one of Aspects 1 to 8 and 12 to 13, wherein the communicated uplink data includes the uplink data via the PUSCH, wherein the PUSCH includes a first part sent on the one panel and includes a second part sent on another panel in the panel set, wherein the PTRS density for the first part sent on the one panel and another PTRS density for the second part sent on the other panel are independent of each other, and wherein the first part and the second part respectively include at least one of the following items: a first set of layers and a second set of layers for spatial division multiplexing (SDM) of the PUSCH, wherein the PTRS density of the first set of layers and the other PTRS density of the second set of layers are respectively independent of each other with respect to at least one of the time domain, the frequency domain or the sample domain. Two sets of RS ports are associated; a first set of RBs and a second set of RBs for frequency division multiplexing (FDM) of the PUSCH, wherein the PTRS density of the first set of RBs and the other PTRS density of the second set of RBs are independent of each other with respect to at least one of the time domain or the frequency domain; a first set of symbols and a second set of symbols for time division multiplexing (TDM) of the PUSCH, wherein the PTRS density of the first set of symbols and the other PTRS density of the second set of symbols are independent of each other with respect to at least one of the time domain or the frequency domain; or the same set of layers, RBs or symbols for a specific implementation of a system frame number (SFN) of the PUSCH, wherein the PTRS density of the same set of layers, RBs or symbols and the other PTRS density of the same set of layers, RBs or symbols are independent of each other with respect to at least one of the time domain or the frequency domain.

[0142] Aspect 15 is a device for performing wireless communications at a network node, comprising a memory and at least one processor coupled to the memory, and at least partially based on information stored in the memory, the at least one processor is configured to: receive information associated with a phase tracking reference signal (PTRS) density for each panel in a panel set associated with the UE from a user equipment (UE); send a configuration associated with the PTRS density for each panel in the panel set to the UE; and based on the configuration, communicate downlink data via a physical downlink shared channel (PDSCH) or uplink data via a physical uplink shared channel (PUSCH) with the UE based on the PTRS density for one panel in the panel set, wherein the PTRS density for the one panel in the panel set is based on at least one of a modulation and coding scheme (MCS) or a number of scheduled resource blocks (RBs) associated with PDSCH reception or PUSCH transmission by the one panel.

[0143] Aspect 16 is an apparatus according to claim 15, wherein the set of panels is associated with a set of UEs, wherein the UEs include the set of UEs, and the set of UEs includes a relay UE set.

[0144] Aspect 17 is an apparatus according to aspect 16, wherein the set of panels includes a plurality of panels, and wherein each panel is associated with a different UE in the set of UEs.

[0145] Aspect 18 is an apparatus according to any one of Aspects 15 to 17, wherein the information includes a threshold associated with the PTRS density, and wherein the PTRS density is based on a comparison between the threshold and the MCS or the number of scheduled RBs.

[0146] Aspect 19 is an apparatus according to Aspect 18, wherein the threshold associated with the PTRS density included in the information is a UE recommended threshold for each panel in the panel set, and wherein the configuration includes a configured threshold associated with the UE recommended threshold for each panel in the panel set, and the at least one processor is further configured to: configure the configured threshold based on the UE recommended threshold for determining the PTRS density.

[0147] Aspect 20 is an apparatus according to any one of aspects 15 to 19, wherein the PDSCH or the PUSCH communicated via the one panel includes at least a portion of the PDSCH or the PUSCH, respectively.

[0148] Aspect 21 is an apparatus according to any one of Aspects 15 to 20, wherein the at least one processor is further configured to: receive an indication of at least one determined resource element (RE) based on the PTRS density; the apparatus also includes at least one of an antenna or a transceiver coupled to the at least one processor, and wherein in order to convey the downlink data via the PDSCH or the uplink data via the PUSCH based on the configuration, the at least one processor is configured to: send or receive PTRS information in the determined at least one RE respectively via the at least one of the antenna or the transceiver.

[0149] Aspect 22 is an apparatus according to any one of Aspects 15 to 21, wherein each panel in the panel set is specified by an explicit panel identifier (ID), a beam group ID, a transmit configuration indicator (TCI) state group ID, an association with a control resource set (CORESET) group, an association with a sounding reference signal (SRS) resource set, one or more port numbers associated with the communication, a code division multiplexing (CDM) group of one or more demodulation reference signal (DMRS) port numbers, an association with a timing advance group (TAG) ID, or at least one of a radio network temporary ID (RNTI).

[0150] Aspect 23 is a device according to any one of Aspects 15 to 22, wherein the communicated downlink data includes the downlink data via the PDSCH sent to the one panel and other downlink data via another PDSCH sent to another panel in the panel set, wherein the PDSCH and the another PDSCH completely overlap, partially overlap or do not overlap with each other in at least one of time or frequency, and wherein the PTRS density for the PDSCH sent to the one panel and the other PTRS density for the another PDSCH sent to the other panel are independent of each other.

[0151] Aspect 24 is an apparatus according to Aspect 23, wherein the communicated downlink data is based on a multiple transmission and reception point (mTRP) PDSCH transmission framework based on multiple downlink control information (multi-DCI), and wherein the PDSCH and the other PDSCH are each associated with a corresponding control resource set (CORESET) pool index representing the one panel and the other panel, respectively.

[0152] Aspect 25 is an apparatus according to any one of Aspects 15 to 24, wherein the communicated downlink data includes the downlink data via the PDSCH, wherein the PDSCH includes a first part sent to the one panel and includes a second part sent to another panel in the panel set, wherein the PTRS density for the first part sent to the one panel and another PTRS density for the second part sent to the other panel are independent of each other, and wherein the first part and the second part respectively include at least one of the following: a first set of layers and a second set of layers for spatial division multiplexing (SDM) of the PDSCH, wherein the PTRS density of the first set of layers and the other PTRS density of the second set of layers are respectively related to two PTRS ports that are independent of each other with respect to at least one of the time domain or the frequency domain. A first set of RBs and a second set of RBs of the PDSCH for frequency division multiplexing (FDM), wherein the PTRS density of the first set of RBs and the other PTRS density of the second set of RBs are independent of each other with respect to at least one of the time domain or the frequency domain; a first set of symbols and a second set of symbols of the PDSCH for time division multiplexing (TDM), wherein the PTRS density of the first set of symbols and the other PTRS density of the second set of symbols are independent of each other with respect to at least one of the time domain or the frequency domain; or a same set of layers, RBs or symbols for a specific implementation of a system frame number (SFN) of the PDSCH, wherein the PTRS density of the same set of layers, RBs or symbols and the other PTRS density of the same set of layers, RBs or symbols are independent of each other with respect to at least one of the time domain or the frequency domain.

[0153] Aspect 26 is an apparatus according to any one of Aspects 15 to 22, wherein the communicated uplink data includes the uplink data via the PUSCH received from the one panel and other uplink data via another PUSCH received from another panel in the panel set, wherein the PUSCH and the another PUSCH completely overlap, partially overlap or do not overlap with each other in at least one of time or frequency, and wherein the PTRS density for the PUSCH received from the one panel and the other PTRS density for the another PUSCH received from the other panel are independent of each other.

[0154] Aspect 27 is an apparatus according to Aspect 26, wherein the communication is based on a multiple transmission and reception point (mTRP) PUSCH transmission framework based on multiple downlink control information (multi-DCI), and wherein the PUSCH and the other PUSCH are each associated with a corresponding control resource set (CORESET) pool index or a sounding reference signal (SRS) resource set representing the one panel and the other panel, respectively.

[0155] Aspect 28 is an apparatus according to any one of Aspects 15 to 22 and 26 to 27, wherein the communicated uplink data includes the uplink data via the PUSCH, wherein the PUSCH includes a first part received from the one panel and includes a second part received from another panel in the panel set, wherein the PTRS density for the first part received from the one panel and another PTRS density for the second part received from the other panel are independent of each other, and wherein the first part and the second part respectively include at least one of the following items: a first set of layers and a second set of layers for spatial division multiplexing (SDM) of the PUSCH, wherein the PTRS density of the first set of layers and the other PTRS density of the second set of layers are respectively independent of each other with respect to PTRs in at least one of a time domain, a frequency domain, or a sample domain. The PUSCH is associated with two sets of S ports; a first set of RBs and a second set of RBs for frequency division multiplexing (FDM) of the PUSCH, wherein the PTRS density of the first set of RBs and the other PTRS density of the second set of RBs are independent of each other with respect to at least one of the time domain or the frequency domain; a first set of symbols and a second set of symbols for time division multiplexing (TDM) of the PUSCH, wherein the PTRS density of the first set of symbols and the other PTRS density of the second set of symbols are independent of each other with respect to at least one of the time domain or the frequency domain; or the same set of layers, RBs or symbols for a specific implementation of a system frame number (SFN) of the PUSCH, wherein the PTRS density of the same set of layers, RBs or symbols and the other PTRS density of the same set of layers, RBs or symbols are independent of each other with respect to at least one of the time domain or the frequency domain.

[0156] Aspect 29 is a method for implementing wireless communication of any one of aspects 1 to 28.

[0157] Aspect 30 is an apparatus for wireless communication, the apparatus comprising means for implementing any one of aspects 1 to 28.

[0158] Aspect 31 is a computer-readable medium (eg, non-transitory computer-readable medium) storing computer-executable code, which, when executed by at least one processor, causes the at least one processor to implement any one of aspects 1 to 28.

Claims

1. An apparatus for wireless communication at a user equipment (UE), comprising: Memory; and at least one processor coupled to the memory and based at least in part on first information stored in the memory, the at least one processor configured to: transmitting information associated with a phase tracking reference signal (PTRS) density for each panel in a set of panels associated with the UE; receiving, from a network entity, a configuration associated with the PTRS density for each panel in the set of panels; and Based on the configuration, downlink data via a physical downlink shared channel (PDSCH) or uplink data via a physical uplink shared channel (PUSCH) is communicated based on the PTRS density for one of the panels in the panel set, wherein the PTRS density for the one of the panels in the panel set is based on at least one of a modulation and coding scheme (MCS) or a number of scheduled resource blocks (RBs) associated with PDSCH reception or PUSCH transmission through the one panel.

2. The apparatus of claim 1, wherein the panel set is associated with a UE set, wherein the UEs include the UE set, and the UE set includes a relay UE set.

3. The apparatus of claim 2, wherein the set of panels comprises a plurality of panels, and wherein each panel is associated with a different UE in the set of UEs.

4. The apparatus of claim 1, wherein the information comprises a threshold associated with the PTRS density, and wherein the PTRS density is based on a comparison between the threshold and the MCS or the number of scheduled RBs.

5. The apparatus of claim 4, wherein the threshold associated with the PTRS density included in the information is a UE-recommended threshold for each panel in the set of panels, and wherein the configuration comprises a configured threshold associated with the UE-recommended threshold for each panel in the set of panels, and wherein the at least one processor is further configured to: The PTRS density is determined according to the configuration based on the comparison. 6 . The apparatus of claim 1 , wherein the PDSCH or the PUSCH communicated via the one panel comprises at least a portion of the PDSCH or the PUSCH, respectively.

7. The apparatus of claim 1, wherein the at least one processor is further configured to: determining at least one resource element (RE) based on the PTRS density; and In order to convey the downlink data via the PDSCH or the uplink data via the PUSCH based on the configuration, the at least one processor is configured to: receive or send PTRS information in the determined at least one RE, respectively.

8. An apparatus according to claim 1, wherein each panel in the panel set is respectively specified by at least one of an explicit panel identifier (ID), a beam group ID, a transmit configuration indicator (TCI) state group ID, an association with a control resource set (CORESET) group, an association with a sounding reference signal (SRS) resource set, one or more port numbers associated with the communication, a code division multiplexing (CDM) group of one or more demodulation reference signal (DMRS) port numbers, an association with a timing advance group (TAG) ID, or a radio network temporary ID (RNTI).

9. A device according to claim 1, wherein the communicated downlink data includes the downlink data via the PDSCH received on the one panel and other downlink data via another PDSCH received on another panel in the panel set, wherein the PDSCH and the another PDSCH completely overlap, partially overlap or do not overlap with each other in at least one of time or frequency, and wherein the PTRS density for the PDSCH received on the one panel and the other PTRS density for the another PDSCH received on the other panel are independent of each other.

10. An apparatus according to claim 9, wherein the communicated downlink data is based on a multiple transmission and reception point (mTRP) PDSCH transmission framework based on multiple downlink control information (multi-DCI), and wherein the PDSCH and the other PDSCH are each associated with a corresponding control resource set (CORESET) pool index representing the one panel and the other panel respectively.

11. The apparatus of claim 1 , wherein the communicated downlink data comprises the downlink data via the PDSCH, wherein the PDSCH comprises a first portion received on the one panel and comprises a second portion received on another panel in the set of panels, wherein the PTRS density for the first portion received on the one panel and another PTRS density for the second portion received on the another panel are independent of each other, and wherein the first portion and the second portion respectively comprise at least one of the following: a first set of layers and a second set of layers for spatial division multiplexing (SDM) of the PDSCH, wherein the PTRS density of the first set of layers and the another PTRS density of the second set of layers are respectively associated with two sets of PTRS ports that are independent of each other with respect to at least one of a time domain or a frequency domain; a first set of RBs and a second set of RBs for frequency division multiplexing (FDM) of the PDSCH, wherein the PTRS density of the first set of RBs and the another PTRS density of the second set of RBs are independent of each other with respect to at least one of the time domain or the frequency domain; a first set of symbols and a second set of symbols for time division multiplexing (TDM) of the PDSCH, wherein the PTRS density of the first set of symbols and the another PTRS density of the second set of symbols are independent of each other with respect to at least one of the time domain or the frequency domain; or The same set of layers, RBs or symbols for a specific implementation of the PDSCH for a system frame number (SFN), wherein the PTRS density of the same set of layers, RBs or symbols and the other PTRS density of the same set of layers, RBs or symbols are independent of each other with respect to at least one of the time domain or the frequency domain.

12. An apparatus according to claim 1, wherein the communicated uplink data includes the uplink data via the PUSCH sent on the one panel and other uplink data via another PUSCH sent on another panel in the panel set, wherein the PUSCH and the another PUSCH completely overlap, partially overlap or do not overlap with each other in at least one of time or frequency, and wherein the PTRS density for the PUSCH sent on the one panel and the another PTRS density for the another PUSCH sent on the other panel are independent of each other.

13. An apparatus according to claim 12, wherein the communication is based on a multiple transmission and reception point (mTRP) PUSCH transmission framework based on multiple downlink control information (multi-DCI), and wherein the PUSCH and the other PUSCH are each associated with a corresponding control resource set (CORESET) pool index or a sounding reference signal (SRS) resource set representing the one panel and the other panel, respectively.

14. The apparatus of claim 1 , wherein the communicated uplink data comprises the uplink data via the PUSCH, wherein the PUSCH comprises a first portion transmitted on the one panel and comprises a second portion transmitted on another panel in the set of panels, wherein the PTRS density for the first portion transmitted on the one panel and another PTRS density for the second portion transmitted on the another panel are independent of each other, and wherein the first portion and the second portion respectively comprise at least one of the following: a first set of layers and a second set of layers for spatial division multiplexing (SDM) of the PUSCH, wherein the PTRS density of the first set of layers and the another PTRS density of the second set of layers are respectively associated with two sets of PTRS ports that are independent of each other with respect to at least one of a time domain, a frequency domain, or a sample domain; a first set of RBs and a second set of RBs for frequency division multiplexing (FDM) of the PUSCH, wherein the PTRS density of the first set of RBs and the another PTRS density of the second set of RBs are independent of each other with respect to at least one of the time domain or the frequency domain; a first set of symbols and a second set of symbols for time division multiplexing (TDM) of the PUSCH, wherein the PTRS density of the first set of symbols and the another PTRS density of the second set of symbols are independent of each other with respect to at least one of the time domain or the frequency domain; or The same set of layers, RBs or symbols for a specific implementation of the PUSCH for a system frame number (SFN), wherein the PTRS density of the same set of layers, RBs or symbols and the other PTRS density of the same set of layers, RBs or symbols are independent of each other with respect to at least one of the time domain or the frequency domain.

15. An apparatus for performing wireless communication at a network entity, comprising: Memory; and at least one processor coupled to the memory and based at least in part on first information stored in the memory, the at least one processor configured to: receiving, from a user equipment (UE), information associated with a phase tracking reference signal (PTRS) density for each panel in a set of panels associated with the UE; transmitting, for the UE, a configuration associated with the PTRS density for each panel in the set of panels; and Based on the configuration, downlink data via a physical downlink shared channel (PDSCH) or uplink data via a physical uplink shared channel (PUSCH) is communicated with the UE based on the PTRS density for one of the panels in the panel set, wherein the PTRS density for the one of the panels in the panel set is based on at least one of a modulation and coding scheme (MCS) or a number of scheduled resource blocks (RBs) associated with PDSCH reception or PUSCH transmission through the one panel.

16. The apparatus of claim 15, wherein the set of panels is associated with a set of UEs, wherein the UEs include the set of UEs, and the set of UEs includes a relay UE set.

17. The apparatus of claim 16, wherein the set of panels comprises a plurality of panels, and wherein each panel is associated with a different UE in the set of UEs.

18. The apparatus of claim 15, wherein the information comprises a threshold associated with the PTRS density, and wherein the PTRS density is based on a comparison between the threshold and the MCS or a number of scheduled RBs.

19. The apparatus of claim 18, wherein the threshold associated with the PTRS density included in the information is a UE-recommended threshold for each panel in the set of panels, and wherein the configuration comprises a configured threshold associated with the UE-recommended threshold for each panel in the set of panels, and wherein the at least one processor is further configured to: The configured threshold is configured based on the UE recommended threshold for determining the PTRS density.

20. The apparatus of claim 15, wherein the PDSCH or the PUSCH communicated via the one panel comprises at least a portion of the PDSCH or the PUSCH, respectively.

21. The apparatus of claim 15, wherein the at least one processor is further configured to: receiving an indication of at least one determined resource element (RE) based on the PTRS density; In order to convey the downlink data via the PDSCH or the uplink data via the PUSCH based on the configuration, the at least one processor is configured to: send or receive PTRS information in the determined at least one RE, respectively.

22. An apparatus according to claim 15, wherein each panel in the panel set is respectively specified by at least one of an explicit panel identifier (ID), a beam group ID, a transmit configuration indicator (TCI) state group ID, an association with a control resource set (CORESET) group, an association with a sounding reference signal (SRS) resource set, one or more port numbers associated with the communication, a code division multiplexing (CDM) group of one or more demodulation reference signal (DMRS) port numbers, an association with a timing advance group (TAG) ID, or a radio network temporary ID (RNTI).

23. A device according to claim 15, wherein the communicated downlink data includes the downlink data via the PDSCH sent to the one panel and other downlink data via another PDSCH sent to another panel in the panel set, wherein the PDSCH and the another PDSCH completely overlap, partially overlap or do not overlap with each other in at least one of time or frequency, and wherein the PTRS density for the PDSCH sent to the one panel and the another PTRS density for the another PDSCH sent to the other panel are independent of each other.

24. An apparatus according to claim 23, wherein the communicated downlink data is based on a multiple transmission and reception point (mTRP) PDSCH transmission framework based on multiple downlink control information (multi-DCI), and wherein the PDSCH and the other PDSCH are each associated with a corresponding control resource set (CORESET) pool index representing the one panel and the other panel respectively.

25. The apparatus of claim 15, wherein the communicated downlink data comprises the downlink data via the PDSCH, wherein the PDSCH comprises a first portion sent to the one panel and comprises a second portion sent to another panel in the set of panels, wherein the PTRS density for the first portion sent to the one panel and another PTRS density for the second portion sent to the another panel are independent of each other, and wherein the first portion and the second portion respectively comprise at least one of: a first set of layers and a second set of layers for spatial division multiplexing (SDM) of the PDSCH, wherein the PTRS density of the first set of layers and the another PTRS density of the second set of layers are respectively associated with two sets of PTRS ports that are independent of each other with respect to at least one of a time domain or a frequency domain; a first set of RBs and a second set of RBs for frequency division multiplexing (FDM) of the PDSCH, wherein the PTRS density of the first set of RBs and the another PTRS density of the second set of RBs are independent of each other with respect to at least one of the time domain or the frequency domain; a first set of symbols and a second set of symbols for time division multiplexing (TDM) of the PDSCH, wherein the PTRS density of the first set of symbols and the another PTRS density of the second set of symbols are independent of each other with respect to at least one of the time domain or the frequency domain; or The same set of layers, RBs or symbols for a specific implementation of the PDSCH for a system frame number (SFN), wherein the PTRS density of the same set of layers, RBs or symbols and the other PTRS density of the same set of layers, RBs or symbols are independent of each other with respect to at least one of the time domain or the frequency domain.

26. An apparatus according to claim 15, wherein the communicated uplink data includes the uplink data via the PUSCH received from the one panel and other uplink data via another PUSCH received from another panel in the panel set, wherein the PUSCH and the another PUSCH completely overlap, partially overlap, or do not overlap with each other in at least one of time or frequency, and wherein the PTRS density for the PUSCH received from the one panel and the another PTRS density for the another PUSCH received from the other panel are independent of each other.

27. An apparatus according to claim 26, wherein the communication is based on a multiple transmission and reception point (mTRP) PUSCH transmission framework based on multiple downlink control information (multi-DCI), and wherein the PUSCH and the other PUSCH are each associated with a corresponding control resource set (CORESET) pool index or a sounding reference signal (SRS) resource set representing the one panel and the other panel, respectively.

28. The apparatus of claim 15, wherein the communicated uplink data comprises the uplink data via the PUSCH, wherein the PUSCH comprises a first portion received from the one panel and comprises a second portion received from another panel in the set of panels, wherein the PTRS density for the first portion received from the one panel and another PTRS density for the second portion received from the another panel are independent of each other, and wherein the first portion and the second portion respectively comprise at least one of: a first set of layers and a second set of layers for spatial division multiplexing (SDM) of the PUSCH, wherein the PTRS density of the first set of layers and the another PTRS density of the second set of layers are respectively associated with two sets of PTRS ports that are independent of each other with respect to at least one of a time domain, a frequency domain, or a sample domain; a first set of RBs and a second set of RBs for frequency division multiplexing (FDM) of the PUSCH, wherein the PTRS density of the first set of RBs and the another PTRS density of the second set of RBs are independent of each other with respect to at least one of the time domain or the frequency domain; a first set of symbols and a second set of symbols for time division multiplexing (TDM) of the PUSCH, wherein the PTRS density of the first set of symbols and the another PTRS density of the second set of symbols are independent of each other with respect to at least one of the time domain or the frequency domain; or The same set of layers, RBs or symbols for a specific implementation of the PUSCH for a system frame number (SFN), wherein the PTRS density of the same set of layers, RBs or symbols and the other PTRS density of the same set of layers, RBs or symbols are independent of each other with respect to at least one of the time domain or the frequency domain.

29. A method of wireless communication at a user equipment (UE), comprising: transmitting information associated with a phase tracking reference signal (PTRS) density for each panel in a set of panels associated with the UE; receiving, from a network entity, a configuration associated with the PTRS density for each panel in the set of panels; and Based on the configuration, downlink data via a physical downlink shared channel (PDSCH) or uplink data via a physical uplink shared channel (PUSCH) is communicated based on the PTRS density for one of the panels in the panel set, wherein the PTRS density for the one of the panels in the panel set is based on at least one of a modulation and coding scheme (MCS) or a number of scheduled resource blocks (RBs) associated with PDSCH reception or PUSCH transmission through the one panel.

30. A method for wireless communication at a network entity, comprising: receiving, from a user equipment (UE), information associated with a phase tracking reference signal (PTRS) density for each panel in a set of panels associated with the UE; transmitting, for the UE, a configuration associated with the PTRS density for each panel in the set of panels; and Based on the configuration, downlink data via a physical downlink shared channel (PDSCH) or uplink data via a physical uplink shared channel (PUSCH) is communicated with the UE based on the PTRS density for one of the panels in the panel set, wherein the PTRS density for the one of the panels in the panel set is based on at least one of a modulation and coding scheme (MCS) or a number of scheduled resource blocks (RBs) associated with PDSCH reception or PUSCH transmission through the one panel.

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