Phase Tracking Reference Signal (PTRS) allocation for multi-symbol demodulation reference signal (DMRS)

Abstract

The present disclosure provides systems, methods, and apparatus for wireless communications, including a computer program encoded on a computer storage medium. In one aspect of the present disclosure, a method of wireless communications includes receiving, at a user equipment (UE), a plurality of demodulation reference signals (DMRS) from a network entity or a second UE, the plurality of demodulation reference signals including a first set of DMRSs assigned to a first DMRS symbol and a first subset of subcarriers and a second set of DMRSs assigned to a second DMRS symbol and a second subset of subcarriers. The method also includes receiving a phase tracking reference signal (PTRS) associated with the plurality of DMRSs from the network entity or the second UE. The method also includes performing channel estimation based on the plurality of DMRSs, and performing a phase tracking process based on the plurality of DMRSs and the PTRSs. Other aspects and features are also claimed and described.

Description

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application claims the benefit of U.S. Patent Application No. 17 / 314,812, filed on May 7, 2021, and entitled “Phase Tracking Reference Signal (PTRS) Allocation for Multi-Symbol Demodulation Reference Signal (DMRS)” and U.S. Provisional Patent Application No. 63 / 024,262, filed on May 13, 2020, and entitled “Phase Tracking Reference Signal (PTRS) Allocation for Multi-Symbol Demodulation Reference Signal (DMRS)”, the entire contents of both patent applications are expressly incorporated herein by reference. Technical Field

[0003] Aspects of the present disclosure relate generally to wireless communication systems and, more particularly, to allocating a Phase Tracking Reference Signal (PTRS). Background Art

[0004] Wireless communication networks are widely deployed to provide various communication services, such as voice, video, packet data, messaging, broadcasting, etc. These wireless networks can be multiple access networks that can support multiple users by sharing available network resources. Such networks are typically multiple access networks that support communication for multiple users by sharing available network resources. An example of such a network is the Universal Terrestrial Radio Access Network (UTRAN). UTRAN is a radio access network (RAN) defined as a part of the Universal Mobile Telecommunications System (UMTS), which is a third generation (3G) mobile phone technology supported by the Third Generation Partnership Project (3GPP). Examples of multiple access network formats include code division multiple access (CDMA) networks, time division multiple access (TDMA) networks, frequency division multiple access (FDMA) networks, orthogonal FDMA (OFDMA) networks, and single carrier FDMA (SC-FDMA) networks.

[0005] A wireless communication network may include multiple base stations or Node Bs that can support communication for multiple user equipments (UEs). A UE may communicate with a base station via a downlink and an uplink. A downlink (or forward link) refers to a communication link from a base station to a UE, and an uplink (or reverse link) refers to a communication link from a UE to a base station.

[0006] The base station may send data and control information to the UE on the downlink, and / or may receive data and control information from the UE on the uplink. On the downlink, the transmission from the base station may encounter interference due to transmissions from neighboring base stations or other wireless radio frequency (RF) transmitters. On the uplink, the transmission from the UE may encounter interference from uplink transmissions from other UEs communicating with neighboring base stations or from other wireless RF transmitters. This interference can reduce the performance of the downlink and uplink.

[0007] As the demand for mobile broadband access continues to increase, the potential for interference and congested networks increases as more UEs access long-range wireless communication networks and more short-range wireless systems are deployed in communities. Research and development continue to drive the development of wireless technologies, not only to meet the growing demand for mobile broadband access, but also to improve and enhance the user's mobile communication experience.

[0008] In a wireless communication system, a wireless device may use a demodulation reference signal (DMRS) to achieve coherent demodulation of a wireless channel. Using frequency division multiplexing (FDM), different DMRS ports may be used to transmit on the same orthogonal frequency division multiplexing (OFDM) symbol by using different subcarriers (e.g., tones) for different DMRS ports. Using code division multiplexing (CDM), different DMRS ports may be used to transmit DMRS on the same OFDM symbol (or across a set of OFDM symbols on the same subcarrier) by using different orthogonal cover codes (OCCs) for different DMRS ports (e.g., DMRS ports used to transmit on the same subcarrier belong to the same CDM group). For wireless communications in frequency bands below 6 gigahertz (GHz), such as frequency range 1 (FR1), and millimeter wave bands, such as FR2, this DMRS design may allow relatively accurate channel estimation and interpolation for subcarriers where DMRS is not received. For example, a UE receiving a DMRS transmission on port 0 on an even subcarrier may be able to use the DMRS measurement to estimate or interpolate the channel on the odd subcarriers despite not receiving a DMRS transmission on the odd subcarriers.

[0009] However, for wireless communications in higher frequency bands (e.g., greater than 52.6 GHz, such as up to 71 GHz), a larger subcarrier spacing (e.g., 960 kilohertz (kHz), 1.92 megahertz (MHz), 3.84 MHz) may be used compared to lower frequency bands (such as FR1 and FR2, which may use subcarrier spacing of 15 kHz, 30 kHz, 60 kHz, 120 kHz, 240 kHz, as non-limiting examples), where the fast Fourier transform (FFT) size is the same as the lower frequency band. Larger subcarrier spacing may mitigate the effects of phase noise in higher frequency bands and may support larger bandwidths, such as 2 GHz, with reasonable FFT sizes. However, in the case of larger subcarrier spacing, the above DMRS design may not allow accurate channel estimation and interpolation for subcarriers where DMRS is not received, because the spacing between subcarriers (e.g., coherence bandwidth) is larger, and therefore accurate estimation and interpolation across subcarriers is more difficult. One technique to address this difficulty in larger subcarrier spacing is to assign the DMRS of the first CDM group to the first OFDM symbol of the first set of subcarriers and assign the DMRS of the second CDM group to the second OFDM symbol of the second set of subcarriers. However, this may cause the DMRS to be misaligned with other reference signals, such as the Phase Tracking Reference Signal (PTRS), which can affect the phase noise correction process. Summary of the invention

[0010] The following summarizes some aspects of the present disclosure to provide a basic understanding of the technology discussed. This summary is not an extensive review of all expected features of the present disclosure, and is neither intended to identify key or important elements of all aspects of the present disclosure, nor is it intended to describe the scope of any or all aspects of the present disclosure. Its sole purpose is to present some concepts of one or more aspects of the present disclosure in an overview form as a preface to a more detailed description presented later.

[0011] In one aspect of the present disclosure, a method of wireless communication includes receiving, at a user equipment (UE), a plurality of demodulation reference signals (DMRS) from a network entity or a second UE, the plurality of demodulation reference signals including a first set of DMRSs allocated to a first DMRS symbol and a first subset of subcarriers and a second set of DMRSs allocated to a second DMRS symbol and a second subset of subcarriers. The method also includes receiving a phase tracking reference signal (PTRS) associated with the plurality of DMRSs (e.g., DMRS symbols) from the network entity or the second UE. The method also includes performing channel and phase noise estimation based on the plurality of DMRSs and the PTRSs.

[0012] In an additional aspect of the present disclosure, a device configured for wireless communication is disclosed. The device includes at least one processor and a memory coupled to the at least one processor. The at least one processor is configured to, when executing instructions stored in the memory, cause the device to receive multiple DMRS from a network entity or a second UE, the multiple DMRS including a first set of DMRSs assigned to a first DMRS symbol and a first subset of subcarriers and a second set of DMRSs assigned to a second DMRS symbol and a second subset of subcarriers. The at least one processor is also configured to, when executing instructions stored in the memory, cause the device to receive PTRS associated with multiple DMRSs (e.g., DMRS symbols) from a network entity or a second UE. The at least one processor is also configured to, when executing instructions stored in the memory, cause the device to perform channel and phase noise estimation based on multiple DMRSs and PTRSs.

[0013] In an additional aspect of the present disclosure, a device configured for wireless communication is disclosed. The device includes a component for receiving a plurality of DMRS from a network entity or a second UE at a UE, the plurality of DMRS including a first set of DMRSs allocated to a first DMRS symbol and a first subset of subcarriers and a second set of DMRSs allocated to a second DMRS symbol and a second subset of subcarriers. The device also includes a component for receiving a PTRS associated with a plurality of DMRSs (e.g., DMRS symbols) from the network entity or the second UE. The device also includes a component for performing channel and phase noise estimation based on the plurality of DMRSs and the PTRSs.

[0014] In an additional aspect of the present disclosure, a non-transitory computer-readable medium stores instructions that, when executed by a processor, cause the processor to perform operations including receiving, at a UE, a plurality of DMRSs from a network entity or a second UE, the plurality of DMRSs including a first set of DMRSs allocated to a first DMRS symbol and a first subset of subcarriers and a second set of DMRSs allocated to a second DMRS symbol and a second subset of subcarriers. The operations also include receiving a PTRS associated with the plurality of DMRSs (e.g., DMRS symbols) from the network entity or the second UE. The operations also include performing channel and phase noise estimation based on the plurality of DMRSs and the PTRSs.

[0015] In another aspect of the present disclosure, a wireless communication method includes sending a plurality of DMRS from a UE to a network entity, the plurality of DMRS including a first set of DMRSs allocated to a first DMRS symbol and a first subset of subcarriers and a second set of DMRSs allocated to a second DMRS symbol and a second subset of subcarriers. The method also includes sending a PTRS associated with the plurality of DMRSs (e.g., DMRS symbols) to the network entity. The method also includes receiving a channel estimate from the network entity, the channel estimate being based on the plurality of DMRSs and the PTRS.

[0016] In an additional aspect of the present disclosure, a device configured for wireless communication is disclosed. The device includes at least one processor and a memory coupled to the at least one processor. At least one processor is configured to, when executing instructions stored in the memory, cause the device to initiate transmission of multiple DMRS to a network entity, the multiple DMRS including a first set of DMRS assigned to a first DMRS symbol and a first subset of subcarriers and a second set of DMRS assigned to a second DMRS symbol and a second subset of subcarriers. At least one processor is also configured to, when executing instructions stored in the memory, cause the device to initiate transmission of a PTRS associated with multiple DMRS (e.g., DMRS symbols) to the network entity. At least one processor is also configured to, when executing instructions stored in the memory, cause the device to receive a channel estimate from the network entity, the channel estimate being based on multiple DMRS and PTRS.

[0017] In an additional aspect of the present disclosure, an apparatus configured for wireless communication is disclosed. The apparatus includes a component for sending a plurality of DMRS from a UE to a network entity, the plurality of DMRS including a first set of DMRSs allocated to a first DMRS symbol and a first subset of subcarriers and a second set of DMRSs allocated to a second DMRS symbol and a second subset of subcarriers. The apparatus also includes a component for sending a PTRS associated with the plurality of DMRSs (e.g., DMRS symbols) to the network entity. The apparatus also includes a component for receiving a channel estimate from the network entity, the channel estimate being based on the plurality of DMRSs and the PTRS.

[0018] In another aspect of the present disclosure, a non-transitory computer-readable medium stores instructions that, when executed by a processor, cause the processor to perform operations including initiating transmission of a plurality of DMRSs from a UE to a network entity, the plurality of DMRSs including a first set of DMRSs allocated to a first DMRS symbol and a first subset of subcarriers and a second set of DMRSs allocated to a second DMRS symbol and a second subset of subcarriers. The operations also include initiating transmission of a PTRS associated with the plurality of DMRSs (e.g., DMRS symbols) to the network entity. The operations also include receiving a channel estimate from the network entity, the channel estimate being based on the plurality of DMRSs and the PTRS.

[0019] In another aspect of the present disclosure, a wireless communication method includes sending a plurality of DMRS from a transmitting node to a UE, the plurality of DMRS including a first set of DMRS allocated to a first DMRS symbol and a first subset of subcarriers and a second set of DMRS allocated to a second DMRS symbol and a second subset of subcarriers. The method also includes sending a PTRS associated with the plurality of DMRS (e.g., DMRS symbols) to the UE. The method also includes receiving a channel estimate from the UE, the channel estimate being based on the plurality of DMRS and the PTRS.

[0020] In an additional aspect of the present disclosure, a device configured for wireless communication is disclosed. The device includes at least one processor and a memory coupled to the at least one processor. The at least one processor is configured to, when executing instructions stored in the memory, cause the device to initiate transmission of multiple DMRS to a UE, the multiple DMRS including a first set of DMRS assigned to a first DMRS symbol and a first subset of subcarriers and a second set of DMRS assigned to a second DMRS symbol and a second subset of subcarriers. The at least one processor is also configured to, when executing instructions stored in the memory, cause the device to initiate transmission of PTRS associated with multiple DMRS (e.g., DMRS symbols) to the UE. The at least one processor is also configured to, when executing instructions stored in the memory, cause the device to receive a channel estimate from the UE, the channel estimate being based on multiple DMRS and PTRS.

[0021] In an additional aspect of the present disclosure, an apparatus configured for wireless communication is disclosed. The apparatus includes a component for sending a plurality of DMRS from a transmitting node to a UE, the plurality of DMRS including a first set of DMRSs allocated to a first DMRS symbol and a first subset of subcarriers and a second set of DMRSs allocated to a second DMRS symbol and a second subset of subcarriers. The apparatus also includes a component for sending a PTRS associated with the plurality of DMRSs (e.g., DMRS symbols) to the UE. The apparatus also includes a component for receiving a channel estimate from the UE, the channel estimate being based on the plurality of DMRSs and the PTRS.

[0022] In another aspect of the present disclosure, a non-transitory computer-readable medium stores instructions that, when executed by a processor, cause the processor to perform operations including initiating a transmission of multiple DMRSs from a transmitting node to a UE, the multiple DMRSs including a first set of DMRSs assigned to a first DMRS symbol and a first subset of subcarriers and a second set of DMRSs assigned to a second DMRS symbol and a second subset of subcarriers. The operations also include initiating a transmission of a PTRS associated with the multiple DMRSs (e.g., DMRS symbols) to the UE. The operations also include receiving a channel estimate from the UE, the channel estimate being based on the multiple DMRSs and the PTRSs.

[0023] In another aspect of the present disclosure, a wireless communication method includes receiving a plurality of DMRS from a UE at a network entity, the plurality of DMRS including a first set of DMRS allocated to a first DMRS symbol and a first subset of subcarriers and a second set of DMRS allocated to a second DMRS symbol and a second subset of subcarriers. The method also includes receiving a PTRS associated with the plurality of DMRS (e.g., DMRS symbols) from the UE. The method also includes performing channel estimation based on the plurality of DMRS, and performing a phase tracking process based on the plurality of DMRS and the PTRS.

[0024] In an additional aspect of the present disclosure, a device configured for wireless communication is disclosed. The device includes at least one processor and a memory coupled to the at least one processor. The at least one processor is configured to, when executing instructions stored in the memory, cause the device to receive multiple DMRS from a UE, the multiple DMRS including a first set of DMRSs assigned to a first DMRS symbol and a first subset of subcarriers and a second set of DMRSs assigned to a second DMRS symbol and a second subset of subcarriers. The at least one processor is also configured to, when executing instructions stored in the memory, cause the device to receive PTRS associated with multiple DMRS (e.g., DMRS symbols) from the UE. The at least one processor is also configured to, when executing instructions stored in the memory, cause the device to perform channel estimation based on multiple DMRSs and perform a phase tracking process based on multiple DMRSs and PTRSs.

[0025] In an additional aspect of the present disclosure, a device configured for wireless communication is disclosed. The device includes a component for receiving a plurality of DMRS from a UE at a network entity, the plurality of DMRS including a first set of DMRSs allocated to a first DMRS symbol and a first subset of subcarriers and a second set of DMRSs allocated to a second DMRS symbol and a second subset of subcarriers. The device also includes a component for receiving a PTRS associated with a plurality of DMRSs (e.g., DMRS symbols) from the UE. The device also includes a component for performing channel estimation based on the plurality of DMRSs and performing a phase tracking process based on the plurality of DMRSs and the PTRSs.

[0026] In another aspect of the present disclosure, a non-transitory computer-readable medium stores instructions that, when executed by a processor, cause the processor to perform operations including receiving, at a network entity, a plurality of DMRSs from a UE, the plurality of DMRSs including a first set of DMRSs allocated to a first DMRS symbol and a first subset of subcarriers and a second set of DMRSs allocated to a second DMRS symbol and a second subset of subcarriers. The operations also include receiving, from the UE, a PTRS associated with the plurality of DMRSs. The operations also include performing channel estimation based on the plurality of DMRSs and the PTRSs.

[0027] By reading the following description of specific exemplary embodiments in conjunction with the accompanying drawings, other aspects, features and embodiments will become apparent to those of ordinary skill in the art. Although features can be discussed relative to certain aspects and the accompanying drawings below, all embodiments may include one or more advantageous features discussed herein. In other words, although one or more aspects may be discussed as having certain advantageous features, one or more such features may also be used according to various aspects. In a similar manner, although exemplary aspects may be discussed below as equipment, systems or methods, exemplary aspects may be implemented in various equipment, systems and methods. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] A further understanding of the nature and advantages of the present disclosure may be achieved by reference to the following drawings. In the drawings, similar components or features may have the same reference numerals. In addition, various components of the same type may be distinguished by following the reference numeral with a dash and a second numeral, the second numeral being used to distinguish similar components. If only the first reference numeral is used in the specification, the description applies to any one similar component having the same first reference numeral, regardless of the second reference numeral.

[0029] Figure 1 is a block diagram illustrating details of a wireless communication system according to some aspects of the present disclosure.

[0030] Figure 2is a block diagram showing a design of a base station and a UE configured according to some aspects.

[0031] Figure 3 is a diagram illustrating examples of antenna ports according to some aspects.

[0032] Figure 4 is a diagram illustrating two examples of forming virtual antenna ports according to some aspects.

[0033] Figure 5 is a block diagram illustrating an example wireless communication system according to some aspects, the example wireless communication system being configured to be capable of communicating multiple demodulation reference signals (DMRS) and a phase tracking reference signal (PTRS) aligned with at least one of the multiple DMRS in a downlink (DL) or a sidelink (SL).

[0034] Figure 6 is a block diagram illustrating an example wireless communication system configured to enable communication of a plurality of DMRSs and a PTRS aligned with at least one of the plurality of DMRSs in an uplink (UL) according to some aspects.

[0035] Figure 7 is a diagram illustrating a first example associated with DMRS and PTRS design for large subcarrier spacing according to some aspects.

[0036] Figure 8 is a diagram illustrating a second example associated with DMRS and PTRS design for large subcarrier spacing according to some aspects.

[0037] Fig. 9 is a diagram illustrating a third example associated with DMRS and PTRS design for large subcarrier spacing according to some aspects.

[0038] Fig.10 is a diagram illustrating a fourth example associated with DMRS and PTRS design for large subcarrier spacing according to some aspects.

[0039] Fig.11 is a flow chart illustrating an example process of UE operation for receiving multiple DMRSs and a PTRS aligned with at least one of the multiple DMRSs in accordance with some aspects.

[0040] Fig.12 is a flow chart illustrating an example process of UE operation for transmitting multiple DMRSs and a PTRS aligned with at least one of the multiple DMRSs in accordance with some aspects.

[0041] Fig.13is a block diagram illustrating an example of a UE configured to receive or transmit a plurality of DMRSs and a PTRS aligned with at least one of the plurality of DMRSs according to some aspects.

[0042] Fig.14 is a flow chart illustrating an example process of a transmitting node operating to transmit a plurality of DMRSs and a PTRS aligned with at least one of the plurality of DMRSs in accordance with some aspects.

[0043] Fig.15 is a flow chart illustrating an example process of network entity operations for receiving a plurality of DMRSs and a PTRS aligned with at least one of the plurality of DMRSs in accordance with some aspects.

[0044] Fig.16 is a block diagram illustrating an example transmitter node configured to transmit or receive a plurality of DMRSs and a PTRS aligned with at least one of the plurality of DMRSs according to some aspects. DETAILED DESCRIPTION

[0045] The detailed description set forth below in conjunction with the accompanying drawings is intended as a description of various configurations and is not intended to limit the scope of the present disclosure. Instead, the detailed description includes specific details in order to provide a thorough understanding of the subject matter of the present invention. It will be apparent to those skilled in the art that these specific details are not required in every case, and in some cases, for clarity of presentation, well-known structures and components are shown in block diagram form.

[0046] The present disclosure provides systems, apparatuses, methods, and computer-readable media for designing (e.g., allocating) demodulation reference signals (DMRS) and phase tracking reference signals (PTRS) for larger subcarrier spacings (such as 960 kilohertz (kHz), 1.92 megahertz (MHz), or 3.84 MHz, as non-limiting examples) for use in higher frequency bands, such as greater than 52.6 gigahertz (GHz), such as up to 71 GHz, as non-limiting examples. The techniques described herein can enable allocating different DMRSs to different orthogonal frequency division multiplexing (OFDM) symbols and different sets of subcarriers (e.g., tones), and allocating PTRSs to other OFDM symbols and at least some subcarriers so that the PTRSs are aligned with at least one of the DMRSs. Aligning the PTRSs with at least one of the DMRSs can enable wireless devices receiving the DMRSs and PTRSs to accurately estimate the channel or interpolate reference signals onto other subcarriers where reference signals are not received, and track phase changes between symbols in transmissions from devices providing the DMRSs and PTRSs.

[0047] For illustration, a user equipment (UE) may receive multiple DMRS from a transmitting node (e.g., a base station or another UE). The UE may also receive a PTRS from the transmitting node. The transmitting node may allocate DMRS and PTRS to various OFDM symbols and various subcarriers so that the PTRS is aligned with at least some of the DMRS. In some implementations, the allocation of PTRS is fixed to align with the first DMRS of the multiple DMRS. This may provide backward compatibility with conventional PTRS designs, such as aligning the PTRS with the DMRS port with the lowest index if different from the first symbol. In some other implementations, the first portion of the PTRS may be aligned with a set of OFDM symbols and subcarriers associated with the first DMRS, and the second portion of the PTRS may be aligned with a set of OFDM symbols and subcarriers associated with the second DMRS of the multiple DMRS. In some other implementations, the allocation of PTRS may be fixed to align with the second DMRS.

[0048] The UE may perform channel estimation and phase tracking (e.g., phase noise estimation) based on the DMRS and PTRS to estimate the wireless channel between the UE and the transmitting node. For example, if the transmitting node is a base station (or other network entity), the base station may send DMRS and PTRS on the downlink (DL), and the UE may perform channel estimation of a physical downlink shared channel (PDSCH) between the UE and the base station, and track the phase change from one symbol to another. In some other implementations, if the transmitting node is a second UE, the second UE may send DMRS and PTRS on the side link (SL), and the UE may perform channel estimation of a physical side link shared channel (PSSCH) between the UE and the second UE, and track the phase change from one symbol to another. In some other implementations, the transmitting node is a base station (or other network entity), and the UE sends DMRS and PTRS. For example, the UE may send DMRS and PTRS to the base station on the uplink (UL), and the base station may perform channel estimation of a physical uplink shared channel (PUSCH) between the UE and the base station, and track the phase change from one symbol to another.

[0049] Specific implementations of the subject matter described in the present disclosure may be implemented to achieve one or more of the following potential advantages. In some aspects, the present disclosure provides techniques for DMRS and PTRS design (e.g., allocation) for larger subcarrier spacing (such as 960kHz, 1.92MHz, or 3.84MHz as non-limiting examples) that mitigate the effects of phase noise in higher frequency bands without reducing the accuracy of channel estimation and interpolation of reference signals to other subcarriers. For illustration, by allocating multiple DMRSs including different DMRSs to different OFDM symbols and subcarriers, a receiving device may use one of the multiple DMRSs corresponding to a selected subcarrier to more accurately estimate a channel, rather than attempting to interpolate a DMRS for a subcarrier based on a single DMRS that may be allocated to a subcarrier with a significantly different frequency due to a larger subcarrier spacing. Supporting larger subcarrier spacing may support larger bandwidths, such as 2GHz as a non-limiting example, with a reasonable Fast Fourier Transform (FFT) size. In addition, the techniques described herein may reduce the impact on the phase noise correction process at a wireless device receiving the DMRS and PTRS compared to other DMRS and PTRS designs for larger subcarrier spacing. For example, because the PTRS is aligned with at least some of the DMRS, the wireless device may estimate and compensate for phase noise with lower complexity and higher accuracy than if the PTRS is not aligned with at least some of the DMRS.

[0050] The present disclosure generally relates to providing or participating in authorized shared access between two or more wireless devices in one or more wireless communication systems (also referred to as wireless communication networks). In various implementations, these techniques and apparatuses may be used in wireless communication networks, such as code division multiple access (CDMA) networks, time division multiple access (TDMA) networks, frequency division multiple access (FDMA) networks, orthogonal FDMA (OFDMA) networks, single carrier FDMA (SC-FDMA) networks, LTE networks, GSM networks, fifth generation (5G) or new radio (NR) networks (sometimes referred to as "5G NR" networks / systems / devices), and other communication networks. As described herein, the terms "network" and "system" may be used interchangeably.

[0051] For example, a CDMA network may implement a radio technology such as Universal Terrestrial Radio Access (UTRA), cdma2000, etc. UTRA includes Wideband-CDMA (W-CDMA) and Low Chip Rate (LCR). CDMA2000 covers IS-2000, IS-95 and IS-856 standards.

[0052] A TDMA network may, for example, implement a radio technology such as the Global System for Mobile Communications (GSM). 3GPP defines the standard for the GSM EDGE (Enhanced Data Rates for GSM Evolution) Radio Access Network (RAN), also known as GERAN. GERAN is the radio component of GSM / EDGE, and the network that connects base stations (e.g., Ater and Abis interfaces) and base station controllers (A interfaces, etc.). The radio access network represents a component of the GSM network through which telephone calls and packet data are routed from the Public Switched Telephone Network (PSTN) and the Internet to user handsets, or from user handsets to the Public Switched Telephone Network and the Internet, and the user handsets are also referred to as user terminals or user equipment (UE). The network of a mobile phone operator may include one or more GERANs, which in the case of a UMTS / GSM network may be coupled to a Universal Terrestrial Radio Access Network (UTRAN). In addition, the operator network may also include one or more LTE networks, and / or one or more other networks. Various different network types may use different radio access technologies (RATs) and radio access networks (RANs).

[0053] OFDMA networks can implement radio technologies such as Evolved UTRA (E-UTRA), IEEE 802.11, IEEE802.16, IEEE 802.20, flash-OFDM, etc. UTRA, E-UTRA, and Global System for Mobile Communications (GSM) are part of Universal Mobile Telecommunications System (UMTS). In particular, Long Term Evolution (LTE) is a version of UMTS that uses E-UTRA. UTRA, E-UTRA, GSM, UMTS, and LTE are described in documents provided by an organization named "3rd Generation Partnership Project" (3GPP), and cdma2000 is described in documents provided by an organization named "3rd Generation Partnership Project 2" (3GPP 2). These different radio technologies and standards are known or under development. For example, 3GPP is a collaboration between telecommunications association groups to define globally applicable third generation (3G) mobile phone specifications. 3GPP Long Term Evolution (LTE) is a 3GPP project that aims to improve the Universal Mobile Telecommunications System (UMTS) mobile phone standard. 3GPP may define specifications for next generation mobile networks, mobile systems, and mobile devices. The present disclosure may describe certain aspects with reference to LTE, 4G, or 5G NR technologies; however, the description is not intended to be limited to a particular technology or application, and one or more aspects described with reference to one technology may be understood to be applicable to another technology. In fact, one or more aspects of the present disclosure relate to wireless spectrum shared access between networks using different radio access technologies or radio air interfaces.

[0054] 5G networks take into account different deployments, different spectrums, and different services and devices that can be implemented using a unified air interface based on OFDM. To achieve these goals, in addition to developing new radio technologies for 5G NR networks, further enhancements to LTE and LTE-A are also considered. 5G NR will be able to scale to provide coverage for: (1) Ultra-high density (e.g., about 1M nodes / km) 2 ), ultra-low complexity (e.g., about tens of bits / second), ultra-low energy (e.g., about 10+ years of battery life), and deep coverage with the ability to reach challenging locations; (2) mission-critical control including strong security for protecting sensitive personal, financial, or classified information, ultra-high reliability (e.g., ~99.9999% reliability), ultra-low latency (e.g., ~1 millisecond (ms)), and users with wide-range mobility or lack of mobility; and (3) enhanced mobile broadband, including extremely high capacity (e.g., about 10 Tbps / km 2 ), extremely high data rates (e.g., multi-Gbps rates, 100+Mbps user experience rates), and deep awareness for advanced discovery and optimization.

[0055] 5G NR devices, networks, and systems can be implemented to use optimized OFDM-based waveform features. These features can include scalable parameter sets and transmission time intervals (TTIs); a general, flexible framework for effectively multiplexing services and functions through dynamic, low-latency time division duplex (TDD) / frequency division duplex (FDD) designs; and advanced wireless technologies such as massive multiple-input multiple-output (MIMO), robust millimeter wave (mmWave) transmission, advanced channel coding, and device-centric mobility. The scalability of parameter sets in 5G NR, as well as the scaling of subcarrier spacing, can effectively solve the problem of operating different services on different spectrums and different deployments. For example, in various outdoor and macro coverage deployments of less than 3GHz FDD / TDD implementations, the subcarrier spacing may appear at 15kHz, such as on bandwidths of 1, 5, 10, 20MHz, etc. For other various outdoor and small cell coverage deployments of TDD greater than 3GHz, the subcarrier spacing on 80 / 100MHz bandwidth may appear at 30kHz. For various other indoor broadband implementations, using TDD on the unlicensed portion of the 5 GHz band, subcarrier spacing may occur at 60 kHz over a 160 MHz bandwidth. Finally, for various deployments that transmit the mmWave component with TDD at 28 GHz, subcarrier spacing may occur at 120 kHz over a 500 MHz bandwidth.

[0056] 5G NR's scalable parameter set helps to scalable TTI to meet different latency and quality of service (QoS) requirements. For example, shorter TTI can be used for low latency and high reliability, while longer TTI can be used for higher spectral efficiency. Efficient multiplexing of long TTI and short TTI allows transmission to start on symbol boundaries. 5G NR also considers a self-contained integrated subframe design with uplink / downlink scheduling information, data, and acknowledgment in the same subframe. The self-contained integrated subframe supports communications in unlicensed or contention-based shared spectrum, adaptive uplink / downlink, which can be flexibly configured on a per-cell basis to dynamically switch between uplink and downlink to meet current business needs.

[0057] For clarity, certain aspects of the apparatus and techniques may be described below with reference to example 5G NR implementations or in a 5G-centric manner, and 5G terminology may be used as an illustrative example in portions of the description below; however, the description is not intended to be limited to 5G applications.

[0058] Furthermore, it should be understood that in operation, a wireless communication network adapted according to the concepts herein can operate with any combination of licensed or unlicensed spectrum depending on load and availability. Therefore, it will be apparent to one of ordinary skill in the art that the systems, devices, and methods described herein can be applied to other communication systems and applications besides the specific examples provided.

[0059] Although various aspects and implementations are described in this application by way of illustration of some examples, it will be understood by those skilled in the art that additional implementations and use cases may occur in many different arrangements and scenarios. The innovations described herein may be implemented across many different platform types, devices, systems, shapes, sizes, and packaging arrangements. For example, implementation and / or use may be implemented by integrated chip implementations and / or other devices based on non-module components (e.g., end-user devices, vehicles, communication devices, computing devices, industrial devices, retail / purchasing devices, medical devices, AI-enabled devices, etc.). Although some examples may or may not be specific to use cases or applications, a variety of applicability of the described innovations may occur. The range of implementations may range from chip-level or modular components to non-modular, non-chip-level implementations, and further to aggregated, distributed, or OEM devices or systems incorporating one or more of the described aspects. In some practical settings, the devices incorporating the described aspects and features may also have to include additional components and features for implementing and practicing the claimed and described implementations. The innovations described herein may be implemented in a wide variety of implementations, including large / small devices of varying sizes, shapes, and configurations, chip-level components, multi-component systems (e.g., RF chains, communication interfaces, processors), distributed arrangements, end-user devices, etc.

[0060] Figure 1 1 is a block diagram illustrating details of an example wireless communication system. The wireless communication system may include a wireless network 100. The wireless network 100 may, for example, include a 5G wireless network. As will be appreciated by those skilled in the art, Figure 1 The components appearing in may have related counterparts in other network arrangements, including, for example, cellular network arrangements and non-cellular network arrangements (e.g., device-to-device or peer-to-peer or ad hoc network arrangements, etc.).

[0061] Figure 1 The wireless network 100 shown includes multiple base stations 105 and other network entities. A base station may be a station that communicates with a UE, and may also be referred to as an evolved Node B (eNB), a next generation eNB (gNB), an access point, etc. Each base station 105 may provide communication coverage for a specific geographic area. In 3GPP, the term "cell" may refer to a specific geographic coverage area of ​​a base station and / or a base station subsystem serving the coverage area, depending on the context in which the term is used. In the implementation of the wireless network 100 herein, the base station 105 may be associated with the same operator or different operators (e.g., the wireless network 100 may include multiple operator wireless networks). In addition, in the implementation of the wireless network 100 herein, the base station 105 may provide wireless communication using one or more of the same frequencies as neighboring cells (e.g., one or more frequency bands in a licensed spectrum, an unlicensed spectrum, or a combination thereof). In some examples, a single base station 105 or UE 115 may be operated by more than one network operating entity. In some other examples, each base station 105 and UE 115 may be operated by a single network operating entity.

[0062] A base station may provide communication coverage for a macro cell or a small cell (such as a pico cell or a femto cell) and / or other types of cells. A macro cell typically covers a relatively large geographic area (e.g., a radius of several kilometers) and may allow unrestricted access to UEs that have subscribed to services with a network provider. A small cell, such as a pico cell, typically covers a relatively small geographic area and may allow unrestricted access to UEs that have subscribed to services with a network provider. A small cell, such as a femto cell, also typically covers a relatively small geographic area (e.g., a home) and, in addition to unrestricted access, may also provide restricted access to UEs associated with the femto cell (e.g., UEs in a closed subscriber group (CSG), UEs of users in a home, etc.). A base station for a macro cell may be referred to as a macro base station. A base station for a small cell may be referred to as a small cell base station, a pico base station, a femto base station, or a home base station. In Figure 1In the example shown, base stations 105d and 105e are conventional macro base stations, while base stations 105a-105c are macro base stations that support one of three-dimensional (3D), full-dimensional (FD), or massive MIMO. Base stations 105a-105c utilize their higher-dimensional MIMO capabilities to increase coverage and capacity by utilizing 3D beamforming in elevation and azimuth beamforming. Base station 105f is a small cell base station, which can be a home node or a portable access point. The base station can support one or more (e.g., two, three, four, etc.) cells.

[0063] Wireless network 100 may support synchronous or asynchronous operation. For synchronous operation, base stations may have similar frame timing, and transmissions from different base stations may be approximately aligned in time. For asynchronous operation, base stations may have different frame timing, and transmissions from different base stations may not be aligned in time. In some cases, the network may be enabled or configured to handle dynamic switching between synchronous or asynchronous operation.

[0064] UE 115 is dispersed throughout the wireless network 100, and each UE may be fixed or mobile. It should be understood that, although in the standards and specifications issued by 3GPP, mobile devices are generally referred to as user equipment (UE), those skilled in the art may additionally or otherwise refer to such devices as mobile stations (MS), subscriber stations, mobile units, user units, wireless units, remote units, mobile devices, wireless devices, wireless communication devices, remote devices, mobile user stations, access terminals (AT), mobile terminals, wireless terminals, remote terminals, mobile phones, terminals, user agents, mobile clients, clients, gaming devices, augmented reality devices, vehicle component devices / modules, or some other suitable terms. In this document, a "mobile" device or UE does not necessarily need to have the ability to move, and may be stationary. Some non-limiting examples of mobile devices, such as one or more implementations that may include UE 115, include mobile phones, cellular (cellular) phones, smart phones, session initiation protocol (SIP) phones, wireless local loop (WLL) stations, laptop computers, personal computers (PCs), notebooks, netbooks, smart books, tablets, and personal digital assistants (PDAs). The mobile device may also be an "Internet of Things" (IoT) or "Internet of Everything" (IoE) device, such as a car or other vehicle, a satellite radio, a global positioning system (GPS) device, a logistics controller, a drone, a multicopter, a quadcopter, smart energy or security equipment, a solar panel or solar array, municipal lighting, water or other infrastructure; industrial automation and enterprise equipment; consumer and wearable devices, such as glasses, wearable cameras, smart watches, health or fitness trackers, mammal implantable devices, gesture tracking devices, medical devices, digital audio players (e.g., MP3 players), cameras, game consoles, etc.; and digital home or smart home devices, such as home audio, video and multimedia devices, appliances, sensors, vending machines, smart lighting, home security systems, smart meters, etc. In one aspect, a UE may be a device that includes a universal integrated circuit card (UICC). In another aspect, a UE may be a device that does not include a UICC. In some aspects, a UE that does not include a UICC may also be referred to as an IoE device. Figure 1 The UEs 115a-115d of the illustrated implementation are examples of mobile smartphone-type devices accessing the wireless network 100. A UE may also be a machine specifically configured for connected communications, including machine type communications (MTC), enhanced MTC (eMTC), narrowband IoT (NB-IoT), and the like. Figure 1 The UEs 115e - 115k shown in FIG. 1 are examples of various machines configured for communications accessing the wireless network 100 .

[0065] A mobile device such as UE 115 may be able to communicate with any type of base station, whether macro, pico, femto, relay, etc. Figure 1 In the figure, the communication link (represented as a lightning) indicates the wireless transmission between the UE and the serving base station (the base station designated to serve the UE on the downlink and / or uplink), or the expected transmission between the base stations, and the backhaul transmission between the base stations. In some cases, the UE can operate as a base station or other network node. The backhaul communication between the base stations of the wireless network 100 can be carried out using wired and / or wireless communication links.

[0066] In operation of the wireless network 100, base stations 105a-105c use 3D beamforming and cooperative spatial techniques (e.g., coordinated multipoint (CoMP) or multi-connectivity) to serve UEs 115a and 115b. Macro base station 105d performs backhaul communications with base stations 105a-105c and small cell base station 105f. Macro base station 105d also transmits multicast services that are subscribed to and received by UEs 115c and 115d. Such multicast services may include mobile TV or streaming video, or may include other services for providing community information, such as weather emergencies or alerts, such as yellow alerts or gray alerts.

[0067] The wireless network 100 of the embodiment supports mission-critical communications with ultra-reliable and redundant links for mission-critical devices, such as UE 115e, which is a drone. The redundant communication links with UE 115e include links from macro base stations 105d and 105e and small cell base station 105f. Other machine-type devices, such as UE 115f (thermometer), UE 115g (smart meter), and UE 115h (wearable device), can communicate directly with base stations such as small cell base station 105f and macro base station 105e through the wireless network 100, or communicate with base stations such as small cell base station 105f and macro base station 105e in a multi-hop configuration by communicating with another user device that relays its information to the network, such as UE 115f communicating temperature measurement information to smart meter UE 115g, which is then reported to the network through small cell base station 105f. The wireless network 100 may also provide additional network efficiency through dynamic, low-latency TDD / FDD communications, such as in a vehicle-to-vehicle (V2V) mesh network between UEs 115i - 115k communicating with a macro base station 105e .

[0068] Figure 2 A block diagram conceptually illustrating an example design of a base station 105 and a UE 115 is shown, which may be Figure 1 For the restricted association scenario (described above), the base station 105 can be any base station and UE in Figure 1 The small cell base station 105f in the example, and the UE 115 may be a UE 115c or 115D operating in the service area of ​​the base station 105f, which will be included in the accessible UE list of the small cell base station 105f in order to access the small cell base station 105f. The base station 105 may also be some other type of base station. Figure 2 As shown, the base station 105 may be equipped with antennas 234a through 234t, and the UE 115 may be equipped with antennas 252a through 252r, to facilitate wireless communications.

[0069] At the base station 105, the transmit processor 220 may receive data from the data source 212 and control information from the controller / processor 240. The control information may be for a physical broadcast channel (PBCH), a physical control format indicator channel (PCFICH), a physical hybrid ARQ (automatic repeat request) indicator channel (PHICH), a physical downlink control channel (PDCCH), an enhanced physical downlink control channel (EPDCCH), an MTC physical downlink control channel (MPDCCH), etc. The data may be for a PDSCH, etc. In addition, the transmit processor 220 may process (e.g., encode and symbol map) the data and the control information to obtain data symbols and control symbols, respectively. The transmit processor 220 may also generate reference symbols, e.g., for a primary synchronization signal (PSS) and a secondary synchronization signal (SSS) and a cell-specific reference signal. If applicable, the transmit (TX) multiple-input multiple-output (MIMO) processor 230 may perform spatial processing (e.g., precoding) on ​​the data symbols, control symbols, and / or reference symbols, and may provide an output symbol stream to the modulators (MODs) 232a to 232t. For example, the spatial processing performed on the data symbols, control symbols, or reference symbols may include precoding. Each modulator 232 may process a respective output symbol stream (e.g., for OFDM, etc.) to obtain an output sample stream. Each modulator 232 may additionally or alternatively process (e.g., convert to analog, amplify, filter, and upconvert) the output sample stream to obtain a downlink signal. The downlink signals from modulators 232a to 232t may be transmitted via antennas 234a to 234t, respectively.

[0070] At the UE 115, antennas 252a to 252r may receive downlink signals from the base station 105 and may provide received signals to demodulators (DEMODs) 254a to 254r, respectively. Each demodulator 254 may condition (e.g., filter, amplify, downconvert, and digitize) a corresponding received signal to obtain input samples. Each demodulator 254 may further process the input samples (e.g., for OFDM, etc.) to obtain received symbols. A MIMO detector 256 may obtain received symbols from the demodulators 254a to 254r, perform MIMO detection on the received symbols if applicable, and provide detected symbols. A receive processor 258 may process (e.g., demodulate, deinterleave, and decode) the detected symbols, provide decoded data for the UE 115 to a data sink 260, and provide decoded control information to a controller / processor 280.

[0071] On the uplink, at the UE 115, the transmit processor 264 may receive and process data from a data source 262 (e.g., for a physical uplink shared channel (PUSCH)) and control information from the controller / processor 280 (e.g., for a physical uplink control channel (PUCCH)). In addition, the transmit processor 264 may generate reference symbols for a reference signal. The symbols from the transmit processor 264 may be precoded by a TX MIMO processor 266, if applicable, further processed by modulators 254a through 254r (e.g., for SC-FDM, etc.), and transmitted to the base station 105. At the base station 105, the uplink signals from the UE 115 may be received by the antenna 234, processed by the demodulator 232, detected by the MIMO detector 236 (if applicable), and further processed by the receive processor 238 to obtain decoded data and control information transmitted by the UE 115. Receive processor 238 may provide decoded data to a data sink 239 and may provide decoded control information to controller / processor 240 .

[0072] The controllers / processors 240 and 280 may direct the operations at the base station 105 and the UE 115, respectively. The controller / processor 240 and / or other processors and modules at the base station 105 and / or the controller / processor 280 and / or other processors and modules at the UE 115 may perform or direct the execution of various processes for the techniques described herein, such as performing or directing Fig.11 , 12 , 14 and 15, and / or other processes of the techniques described herein. Memories 242 and 282 may store data and program codes for base station 105 and UE 115, respectively. Scheduler 244 may schedule UEs for data transmission on the downlink and / or uplink.

[0073] Wireless communication systems operated by different network operating entities (e.g., network operators) may share spectrum. In some cases, a network operating entity may be configured to use the entire designated shared spectrum for at least a period of time before another network operating entity uses the entire designated shared spectrum at a different time period. Therefore, in order to allow the network operating entity to use the entire designated shared spectrum and to mitigate interfering communications between different network operating entities, certain resources (e.g., time) may be divided and allocated to different network operating entities for certain types of communications.

[0074] For example, a network operating entity may be allocated certain time resources that are reserved for dedicated communications by the network operating entity using the entire shared spectrum. A network operating entity may also be allocated other time resources where the entity is given a higher priority than other network operating entities to communicate using the shared spectrum. If the prioritized network operating entity does not utilize the time resources that are prioritized for use by the network operating entity, then these time resources that are prioritized for use by the network operating entity may be utilized by other network operating entities on an opportunistic basis. Additional time resources may be allocated to any network operator for use on an opportunistic basis.

[0075] Access to the shared spectrum and arbitration of time resources between different network operating entities can be centrally controlled by a separate entity, autonomously determined by a predefined arbitration scheme, or dynamically determined based on interactions between wireless nodes of the network operator.

[0076] In some cases, the UE 115 and the base station 105 may operate in a shared radio spectrum band, which may include licensed or unlicensed (e.g., contention-based) spectrum. In the unlicensed frequency portion of the shared radio spectrum band, the UE 115 or the base station 105 may traditionally perform a media sensing process to compete for access to the spectrum. For example, the UE 115 or the base station 105 may perform a listen-before-talk or listen-before-transmit (LBT) process, such as a clear channel assessment (CCA), before communicating to determine whether the shared channel is available. In some implementations, the CCA may include an energy detection process to determine whether there are any other active transmissions. For example, a device may infer that a change in a received signal strength indicator (RSSI) of a power meter indicates that the channel is occupied. Specifically, a signal power concentrated in a certain bandwidth and exceeding a predetermined noise floor may indicate another wireless transmitter. CCA may also include detection of a specific sequence indicating channel usage. For example, another device may send a specific preamble before sending a data sequence. In some cases, the LBT process may include the wireless node adjusting its own backoff window based on the amount of energy detected on the channel and / or acknowledgement / negative acknowledgement (ACK / NACK) feedback for its own transmitted packets as a proxy for collisions.

[0077] Figure 3 is a diagram illustrating an example 300 of antenna ports according to some aspects. Figure 3 As shown, the first physical antenna 305-1 can send information via the first channel h1, the second physical antenna 305-2 can send information via the second channel h2, the third physical antenna 305-3 can send information via the third channel h3, and the fourth physical antenna 305-4 can send information via the fourth channel h4. Such information can be transmitted via logical antenna ports, which can represent some combination of physical antennas and / or channels. In some cases, the UE 115 may not be aware of the channels associated with the physical antennas and may operate only based on the knowledge of the channels associated with the antenna ports, as defined below.

[0078] Antenna ports may be defined so that the channel through which a symbol on the antenna port is transmitted may be inferred from the channel through which another symbol on the same antenna port is transmitted. In example 300, the channels associated with antenna port 1 (AP1) are represented as h1-h2+h3+j*h4, where the channel coefficients (e.g., 1, -1, 1, and j in this case) represent weighting factors (e.g., indicating phase and / or gain) applied to each channel. Such weighting factors may be applied to the channels to improve signal power and / or signal quality at one or more receivers. Applying such weighting factors to channel transmissions may be referred to as precoding, and a particular set of weighting factors applied to a set of channels may be referred to as a precoder.

[0079] Similarly, the channel associated with antenna port 2 (AP2) is represented as h1+j*h3, and the channel associated with antenna port 3 (AP3) is represented as 2*h1-h2+(1+j)*h3+j*h4. In this case, antenna port 3 can be represented as the sum of antenna port 1 and antenna port 2 (e.g., AP3=AP1+AP2) because the sum of the expression for antenna port 1 (h1-h2+h3+j*h4) and the expression for antenna port 2 (h1+j*h3) is equal to the expression for antenna port 3 (2*h1-h2+(1+j)*h3+j*h4). It can also be said that antenna port 3 is related to antenna ports 1 and 2 [AP1, AP2] via precoder [1,1] because the expression for antenna port 1 multiplied by 1 plus the expression for antenna port 2 multiplied by 1 is equal to the expression for antenna port 3.

[0080] Figure 4400 is a diagram illustrating two examples of forming virtual antenna ports according to some aspects. The antennas of a multi-antenna UE (e.g., UE 115) can be classified into one of three groups based on the coherence of the UE's antenna ports. A group of antenna ports (e.g., two antenna ports) is coherent if the relative phase between them remains the same between a sounding reference signal (SRS) transmission from those antenna ports and a subsequent physical uplink shared channel (PUSCH) transmission from those antenna ports. In this case, the SRS can be used (e.g., by a UE or a base station) to determine an uplink precoder for precoding a PUSCH transmission, because the relative phase of the antenna ports will be the same for both the SRS transmission and the PUSCH transmission. Precoding can span the group of coherent antenna ports.

[0081] If a group of antenna ports is non-coherent, such uplink precoder determination becomes difficult because the relative phase between the antenna ports will change from SRS transmission to PUSCH transmission. For example, if the relative phase between a group of antenna ports is different for SRS transmission and PUSCH transmission, the group of antenna ports is considered to be non-coherent. In this case, using the same uplink precoder for a group of non-coherent antenna ports may cause the UE to apply inappropriate or inaccurate precoding weights (e.g., phase and gain weights) to the data streams sent from the non-coherent antenna ports. In addition, if a first subset of a group of antenna ports are coherent with each other and a second subset of the group of antenna ports are coherent with each other, but the first subset of the group of antenna ports and the second subset of the group of antenna ports are incoherent with each other, the group of antenna ports is considered to be partially coherent. In this case, common precoding can be used within each corresponding subset of coherent antenna ports, but common precoding cannot be used across different subsets of non-coherent antenna ports.

[0082] In some cases, when a base station schedules PUSCH transmissions for a multi-antenna UE with non-coherent or partially coherent antenna ports, the signaling communication for scheduling the PUSCH transmissions may identify the uplink precoder to be used to precode the PUSCH transmissions. Conventionally, because the UE's antenna ports are non-coherent (or, in the case of partially coherent antenna ports, a non-coherent group of coherent antenna ports), the UE may be able to use an uplink precoder for only one of the antenna ports (or antenna port groups), while the other antenna ports (or antenna port groups) are not used for PUSCH transmissions. Because only a subset of the non-coherent or partially coherent antenna ports are used, this may result in reduced transmit power for the PUSCH transmission, reduced reliability of the PUSCH transmission (due to lack of transmit or spatial diversity), or a combination thereof.

[0083] In order to utilize some or all of the non-coherent or partially coherent antenna ports, the UE may apply various techniques to synthesize the non-coherent or partially coherent antenna ports into virtual antenna ports, so that common precoding may be used on the virtual antenna ports and common precoding may be applied on the non-coherent antenna ports. A virtual (or logical) antenna port may represent a combination of two or more antenna ports. This allows the base station to select an uplink precoder for the virtual antenna port and allows the UE to transmit using an uplink precoder on the non-coherent or partially coherent antenna ports that have been combined to form the virtual antenna port.

[0084] For example, as shown in reference numeral 405, a group of non-coherent antenna ports (e.g., shown as two non-coherent antenna ports) can be combined into a single virtual port using precoding (e.g., uplink precoding) and cyclic delay diversity. The precoder can be determined by the UE 115 and / or signaled by the base station 105. Cyclic delay diversity (CDD) can refer to a technique that introduces a delay (e.g., a cyclic delay) on one of the non-coherent antenna ports without introducing a delay on another non-coherent antenna port. The delay can be measured in samples (e.g., 5 samples, 10 samples, etc.), fractions of samples, etc. For example, a first non-coherent antenna port can send a first sample stream, while a second non-coherent antenna port can send a second sample stream (e.g., which can be the same stream) with a slight cyclic delay (e.g., a delay of 5 samples, 10 samples, etc.). For example, for a cyclic delay of 5 samples, where 16 samples are sent per symbol, a first non-coherent antenna port may send the 16 samples with the first sample sent first (e.g., [s1, s2, s3, s4, ..., s16]) and a second non-coherent antenna port may send the 16 samples with the first sample sent sixth (e.g., with a delay of 5 samples) (e.g., [s12, s13, s14, s15, s16, s1, s2, s3, ..., s11]).

[0085] Additionally or alternatively, as shown in reference numeral 410, a set of partially coherent antenna ports can be combined into a single virtual antenna port using precoding (e.g., uplink precoding) and cyclic delay diversity in a manner similar to that described above. As shown, a first subset of antenna ports can be coherent with each other, and a second subset of antenna ports can be coherent with each other, but the two subsets can be incoherent with each other. As further shown, precoding can be applied to each subset to generate a first virtual antenna port and a second virtual antenna port that are incoherent with each other. CDD can then be applied to the two virtual antenna ports (e.g., by sending communications from the virtual antenna ports using CDD) to form a single virtual antenna port from the partially coherent antenna ports (e.g., using precoding and CDD).

[0086] The present disclosure provides systems, apparatus, methods, and computer-readable media for designing (e.g., allocating) demodulation reference signals (DMRS) and phase tracking reference signals (PTRS) for larger subcarrier spacing (such as 960kHz, 1.92MHz, or 3.84MHz as non-limiting examples) for use in higher frequency bands, such as greater than 52.6GHz, such as up to 71GHz. The techniques described herein can enable allocating different DMRS to different OFDM symbols and different sets of subcarriers (e.g., tones), and allocating PTRS to other OFDM symbols and at least some subcarriers so that the PTRS is aligned with at least one of the DMRS. Aligning the PTRS with at least one of the DMRS can enable a wireless device receiving the DMRS and PTRS to accurately estimate the channel or interpolate the reference signal onto other subcarriers where the reference signal is not received, as well as track phase changes between symbols.

[0087] For illustration, the UE may receive multiple DMRS from a transmitting node (e.g., a base station or another UE). The UE may also receive a PTRS from the transmitting node. The transmitting node may allocate DMRS and PTRS to various OFDM symbols and various subcarriers such that the PTRS is aligned with at least some of the DMRS. In some implementations, the allocation of the PTRS is fixed to align with the first DMRS of the multiple DMRSs. This may provide backward compatibility with conventional PTRS designs, such as aligning the PTRS with the DMRS port with the lowest index if different from the first symbol. In some other implementations, the first portion of the PTRS may be aligned with a set of OFDM symbols and subcarriers associated with the first DMRS, and the second portion of the PTRS may be aligned with a set of OFDM symbols and subcarriers associated with the second DMRS of the multiple DMRSs. In some other implementations, the allocation of the PTRS may be fixed to align with the second DMRS.

[0088] The UE may perform channel estimation and phase tracking (e.g., phase noise estimation) based on the DMRS and PTRS to estimate the wireless channel between the UE and the transmitting node. For example, if the transmitting node is a base station (or other network entity), the base station may send DMRS and PTRS on the downlink (DL), and the UE may perform channel estimation of a physical downlink shared channel (PDSCH) between the UE and the base station, and track the phase change from one symbol to another. In some other implementations, if the transmitting node is a second UE, the second UE may send DMRS and PTRS on the side link (SL), and the UE may perform channel estimation of a physical side link shared channel (PSSCH) between the UE and the second UE, and track the phase change from one symbol to another. In some other implementations, the transmitting node is a base station (or other network entity), and the UE sends DMRS and PTRS. For example, the UE may send DMRS and PTRS to the base station on the uplink (UL), and the base station may perform channel estimation of a physical uplink shared channel (PUSCH) between the UE and the base station, and track the phase change from one symbol to another.

[0089] Specific implementations of the subject matter described in the present disclosure may be implemented to achieve one or more of the following potential advantages. In some aspects, the present disclosure provides techniques for DMRS and PTRS design (e.g., allocation) for larger subcarrier spacing (such as 960kHz, 1.92MHz, or 3.84MHz as non-limiting examples) that mitigate the effects of phase noise in higher frequency bands without reducing the accuracy of channel estimation and interpolation of reference signals to other subcarriers. For illustration, by allocating multiple DMRSs including different DMRSs to different OFDM symbols and subcarriers, a receiving device may use one of the multiple DMRSs corresponding to a selected subcarrier to more accurately estimate a channel, rather than attempting to interpolate a DMRS for a subcarrier based on a single DMRS that may be allocated to a subcarrier with a significantly different frequency due to a larger subcarrier spacing. Supporting larger subcarrier spacing may support larger bandwidths, such as 2GHz as a non-limiting example, with a reasonable Fast Fourier Transform (FFT) size. In addition, the techniques described herein may reduce the impact on the phase noise correction process at a wireless device receiving the DMRS and PTRS compared to other DMRS and PTRS designs for larger subcarrier spacing. For example, because the PTRS is aligned with at least some of the DMRS, the wireless device may estimate and compensate for phase noise with lower complexity and higher accuracy than if the PTRS is not aligned with at least some of the DMRS.

[0090] Figure 51 is a block diagram of an example wireless communication system 500 for implementing communication of multiple DMRS and PTRS aligned with at least one of the multiple DMRS in the DL or SL according to some aspects. In some implementations, the wireless communication system 500 can implement aspects of the wireless network 100. The wireless communication system 500 includes a UE 115 and a transmitting node 550. In some implementations, the transmitting node 550 may include or correspond to a network entity. As an illustrative, non-limiting example, the network entity may include or correspond to a base station, such as a base station 105, a network, a network core, or another network device. In some other implementations, the transmitting node 550 includes or corresponds to a second UE. Although one UE 115 and one transmitting node 550 are shown, in some other implementations, the wireless communication system 500 may generally include multiple UEs 115 and may include more than one transmitting node 550.

[0091] The UE 115 may include various components (such as structures, hardware components) for performing one or more functions described herein. For example, these components may include a processor 502, a memory 504, an antenna port 514 (e.g., multiple antenna ports), a transmitter 520, and a receiver 522. The processor 502 may be configured to execute instructions stored in the memory 504 to perform the operations described herein. In some implementations, the processor 502 includes or corresponds to the controller / processor 280, and the memory 504 includes or corresponds to the memory 282.

[0092] In some implementations, the memory 504 may be configured to store a predetermined value 506, a comb 512, or a combination thereof. The predetermined value 506 may include a plurality of predetermined values ​​indicating an offset of a PTRS associated with a configuration of a DMRS, one or more combs for communicating a DMRS, or a combination thereof. In some embodiments, the predetermined value 506 includes at least a first predetermined value 508 and a second predetermined value 510. The comb 512 may be a comb (or data representing a comb) for transmitting or receiving a DMRS by the UE 115.

[0093] Antenna port 514 includes multiple antenna ports for transmitting signals from UE 115. Antenna port 514 can be a physical antenna port, such as Figure 3 The antenna ports 514 are described as being AP1, AP2, and AP3. In some implementations, the antenna ports 514 include at least a first antenna port 516 and a second antenna port 518.

[0094] The transmitter 520 is configured to send reference signals, control information, and data to one or more other devices, and the receiver 522 is configured to receive reference signals, synchronization signals, control information, and data from one or more other devices. For example, the transmitter 520 can send signaling, control information, and data, and the receiver 522 can receive signaling, control information, and data via a network, such as a wired network, a wireless network, or a combination thereof. For example, the UE 115 can be configured to send or receive signaling, control information, and data via a direct device-to-device connection, a local area network (LAN), a wide area network (WAN), a modem-to-modem connection, the Internet, an intranet, an extranet, a cable transmission system, a cellular communication network, any combination of the above, or any other communication network now known or later developed that allows two or more electronic devices to communicate therein. In some implementations, the transmitter 520 and the receiver 522 can be integrated in a transceiver. Additionally or alternatively, the transmitter 520, the receiver 522, or both can include and correspond to the reference Figure 2 One or more components of UE 115 are described.

[0095] The transmitting node 550 may include various components (such as structures, hardware components) for performing one or more functions described herein. For example, these components may include a processor 552, a memory 554, a transmitter 556, and a receiver 558. The processor 552 may be configured to execute instructions stored in the memory 554 to perform the operations described herein. In some implementations, the processor 552 includes or corresponds to the controller / processor 240, and the memory 554 includes or corresponds to the memory 242.

[0096] In some implementations, the memory 554 may be configured to store a predetermined value 555. The predetermined value 555 may include a plurality of predetermined values ​​indicating an offset of a PTRS associated with a configuration of a DMRS, one or more combs for communicating a DMRS, or a combination thereof. In some embodiments, the predetermined value 555 includes at least a first predetermined value 557 and a second predetermined value 559.

[0097] The transmitter 556 is configured to send reference signals, synchronization signals, control information, and data to one or more other devices, and the receiver 558 is configured to receive reference signals, control information, and data from one or more other devices. For example, the transmitter 556 can send signaling, control information, and data, and the receiver 558 can receive signaling, control information, and data via a network, such as a wired network, a wireless network, or a combination thereof. For example, the transmitting node 550 can be configured to send or receive data via a direct device-to-device connection, a LAN, a WAN, a modem-to-modem connection, the Internet, an intranet, an extranet, a cable transmission system, a cellular communication network, any combination of the above, or any other communication network now known or later developed that allows two or more electronic devices to communicate therein. In some implementations, the transmitter 556 and the receiver 558 can be integrated into a transceiver. Additionally or alternatively, the transmitter 556, the receiver 558, or both can include and correspond to the reference Figure 2 One or more components of base station 105 are described.

[0098] In some implementations, the wireless communication system 500 implements a 5G New Radio (NR) network. For example, the wireless communication system 500 may include a plurality of 5G-capable UEs 115 and a plurality of 5G-capable transmitting nodes 550, such as UEs and transmitting nodes configured to operate according to a 5G NR network protocol such as defined by 3GPP.

[0099] During operation of the wireless communication system 500, the transmitting node 550 may transmit a plurality of DMRS 560 to the UE 115. The DMRS 560 may include a first set 562 of DMRSs allocated to a first DMRS symbol and a first subset of subcarriers, and a second set 564 of DMRSs allocated to a second DMRS symbol and a second subset of subcarriers. For example, the transmitting node 550 may allocate one or more DMRSs to a first OFDM symbol across a first subset of subcarriers (referred to as first DMRS symbols due to the allocation of DMRSs to OFDM symbols), and the transmitting node 550 may allocate one or more other DMRSs to a second OFDM symbol across a second subset of subcarriers (referred to as second DMRS symbols). As a specific, non-limiting example, the transmitting node 550 may allocate the first set 562 of DMRSs to OFDM symbol 3 and odd subcarriers (e.g., subcarriers indexed as 1, 3, 5, etc.), and the transmitting node 550 may allocate the second set 564 of DMRSs to OFDM symbol 4 and even subcarriers (e.g., subcarriers indexed as 2, 4, 6, etc.). In some implementations, as a non-limiting example, the first DMRS symbol and the second DMRS symbol are consecutive symbols, such as OFDM symbol 3 and OFDM symbol 4. In some other implementations, as a non-limiting example, the first DMRS symbol and the second DMRS symbol are non-consecutive DMRS symbols, such as OFDM symbol 3 and OFDM symbol 7. Figure 7-10 Other details related to assigning DMRS to various OFDM symbols and subcarriers are described. Although the assignment of a first OFDM symbol to a second OFDM symbol is described, this description is not limiting. In some other implementations, the first set 562 of DMRS can be associated with (e.g., assigned to) a first group of OFDM symbols (e.g., a first group of DMRS symbols), the second set 564 of DMRS can be associated with (e.g., assigned to) a second group of OFDM symbols (e.g., a second group of DMRS symbols), or both.

[0100] The first set 562 of DMRS and the second set 564 of DMRS may each be sent using one or more DMRS ports. For example, the transmitting node 550 may send the first set 562 of DMRS using a first DMRS port (or a first DMRS port group), and the transmitting node 550 may send the second set 564 of DMRS using a second DMRS port (or a second DMRS port group) different from the first DMRS port. For illustration, an interleaved DMRS pattern may be formed by sending DMRS on different symbols according to resource element (RE) allocations for different configured ports, thereby effectively sending one port. For example, for rank 1, UE 115 is scheduled with one actual port. Reference Figure 7-10 Allocation of DMRS is further described.

[0101] In some implementations, different DMRSs may be associated with different antenna ports of the UE 115. For example, a first set 562 of DMRSs may be associated with the first antenna port 516, and a second set 564 of DMRSs may be associated with the second antenna port 518. In some such implementations, the first antenna port 516 may be included in (or associated with) a first code division multiplexing (CDM) group configured for the UE 115, and the second antenna port 518 may be included in (or associated with) a second CDM group configured for the UE 115. For illustration, the transmitting node 550 may send a DMRS configuration to the UE 115. The DMRS configuration may be included in a configuration message, such as a radio resource control (RRC) message. The DMRS configuration may indicate one or more CDM groups configured for the UE 115, and corresponding DMRS ports included in each CDM group. For example, the DMRS configuration may indicate a first CDM group including at least DMRS port 0 (corresponding to the first antenna port 516) and a second CDM group including at least DMRS port 2 (corresponding to the second antenna port 518). Before transmitting the DMRS 560, the transmitting node 550 may transmit to the UE 115 an indication of one or more antenna ports included in the one or more CDM groups and allocated to the UE 115 for receiving the DMRS 560. For example, the indication may indicate that a first port (e.g., DMRS port 0, corresponding to the first antenna port 516) included in the first CDM group is allocated to the UE 115 for receiving a first set 562 of DMRS, and a second port (e.g., DMRS port 2, corresponding to the second antenna port 518) in the second CDM group is allocated to the UE 115 for receiving a second set 564 of DMRS. These antenna ports (e.g., DMRS ports corresponding to the first antenna port 516 and the second antenna port 518) may be referred to as allocated DMRS ports or scheduled DMRS ports.

[0102] In some implementations, the indicated port for receiving a DMRS transmission may be assigned for one or more resource blocks (RBs) to the UE 115. For example, the indicated DMRS port may be used to receive a DMRS transmission (e.g., for one or more PDSCH communications or one or more PSSCH communications) in a set of RBs included in a resource allocation scheduled for the UE 115. In some implementations, the DMRS port, the set of RBs, the resource allocation, or a combination thereof may be included in downlink control information (DCI).

[0103] UE 115 may use antenna port 514 to receive DMRS 560. For example, UE 115 may use first antenna port 516 (e.g., an antenna port included in or corresponding to a first CDM group) to receive a first set 562 of DMRS, and UE 115 may use second antenna port 518 (e.g., an antenna port included in or corresponding to a second CDM group) to receive a second set 564 of DMRS. In some implementations, UE 115 may combine first antenna port 516 and second antenna port 518 into a single virtual port for receiving DMRS 560 (e.g., both first set 562 of DMRS and second set 564 of DMRS). For example, as described in reference Figure 4 As described, the UE 115 may combine the first antenna port 516 and the second antenna port 518 into a single virtual port. In some such implementations, the indication of the allocated DMRS port from the transmitting node 550 may also indicate that two or more allocated DMRS ports are to be combined into a corresponding virtual port. As non-limiting examples, the indication may be included in a configuration message (e.g., an RRC message), a DCI, an activation DCI, or a media access control (MAC) control element (MAC-CE). As further described herein, the UE 115 may perform channel estimation using a single virtual port.

[0104] In addition to transmitting DMRS 560, the transmitting node 550 may also transmit PTRS 566 to the UE 115. The PTRS 566 may be associated with the DMRS 560. For example, the transmitting node 550 may assign the PTRS 566 (or multiple PTRS) to OFDM symbols (also referred to as PTRS symbols) and subcarriers such that the PTRS 566 is aligned with at least one of the DMRS 560. The transmitting node 550 may use one or more PTRS ports to transmit the PTRS 566, similar to the DMRS ports used to transmit the DMRS 560. For example, different PTRS ports may be assigned to different OFDM symbols, different subcarriers, or both. In some embodiments, different PTRS ports may have different powers, such as zero power or non-zero power, as further described herein.

[0105] In some implementations, the PTRS 566 is allocated to one or more symbols after the first DMRS symbol to which the first set of DMRS 562 is allocated and one or more subcarriers of the first subset of subcarriers to which the first set of DMRS 562 is allocated. For example, the DMRS 560 and the PTRS 566 may be allocated according to the first configuration, as shown in FIG. Figure 7 In some other implementations, PTRS 566 is optionally allocated to a first set of symbols between a first DMRS symbol and a second DMRS symbol (to which a second set 564 of DMRS is allocated), and one or more subcarriers of a first set of subcarriers, and allocated to a second set of symbols after the second DMRS symbol and one or more subcarriers of a second subset of subcarriers (to which a second set 564 of DMRS is allocated). For example, DMRS 560 and PTRS 566 may be allocated according to a second configuration, as described in reference to Figure 8 In some other implementations, PTRS 566 is allocated to one or more symbols after the second DMRS symbol and one or more subcarriers of the second subset of subcarriers. For example, DMRS 560 and PTRS 566 may be allocated according to a third configuration, as described in reference to Fig. 9 Further described.

[0106] The DMRS 560 and PTRS 566 may be associated with one or more types of channels between the transmitting node 550 and the UE 115 and enable the UE 115 to determine channel estimates corresponding to the one or more types of channels. In some implementations, the transmitting node 550 is a network entity, and the DMRS 560 and PTRS 566 are associated with the PDSCH 590 between the UE 115 and the network entity (e.g., the transmitting node 550). In such implementations, the DMRS 560 and PTRS 566 may be allocated according to the first configuration, the second configuration, or the third configuration. In some other implementations, the transmitting node 550 is a second UE, and the DMRS 560 and PTRS 566 are associated with the PSSCH 592 between the UE 115 and the second UE (e.g., the transmitting node 550). In such implementations, the DMRS 560 and PTRS 566 may be allocated according to the first configuration or the second configuration instead of the third configuration.

[0107] In some implementations of allocating DMRS 560 and PTRS 566 according to the second configuration, the transmitting node 550 may signal the offset associated with the allocation of PTRS 566 to the UE 115. For example, the transmitting node 550 may send a higher layer parameter 572 to the UE 115. The higher layer parameter 572 may be included in a message, such as an RRC message, a MAC-CE, or some other signal or message. In some implementations, the higher layer parameter 572 is defined as a "resourceElementoffset" parameter. The higher layer parameter 572 may include a first higher layer parameter 574 associated with the first set 562 of DMRS and a second higher layer parameter 576 associated with the second set 564 of DMRS. The first higher layer parameter 574 may indicate a first offset of a first set of symbols to which the PTRS 566 is allocated, and the second higher layer parameter 576 may indicate a second offset of a second set of symbols to which the PTRS 566 is also allocated. As non-limiting examples, the first offset and the second offset may indicate an offset (in symbols) from an initial OFDM symbol of an RB allocated to UE 115, or the first offset may indicate an offset from a first DMRS symbol to which a first set 562 of DMRS is allocated, and the second offset may indicate an offset from a second DMRS symbol to which a second set 564 of DMRS is allocated.

[0108] In some other implementations of allocating DMRS 560 and PTRS 566 according to the second configuration, the offset associated with the allocation of PTRS 566 can be determined based on a predetermined value 506 stored at UE 115 (e.g., at memory 504) or a predetermined value 555 stored at transmitting node 550 (e.g., at memory 554). For illustration, the predetermined value 506 and the predetermined value 555 can indicate a plurality of offsets corresponding to a configuration of DMRS (and PTRS), a comb for communicating DMRS (and PTRS), or a combination thereof. The UE 115 and the transmitting node 550 can determine the offset associated with the allocation of PTRS 566 by accessing the predetermined value 506 or the predetermined value 555, respectively, and matching the configuration of DMRS 560 and PTRS 566, the comb (e.g., comb 512) for communicating DMRS 560 and PTRS 566, or both, with the configuration, comb, or both associated with one or more of the predetermined value 506 or the predetermined value 555. The predetermined value 506 may include a first predetermined value 508 indicating a first offset of a first set of symbols to which the PTRS 566 is assigned, and a second predetermined value 510 indicating a second offset of a second set of symbols to which the PTRS 566 is assigned. Similarly, the predetermined value 555 may include a first predetermined value 557 indicating a first offset of the first set of symbols, and a second predetermined value 559 indicating a second offset of the second set of symbols. As non-limiting examples, the first offset and the second offset may indicate an offset (in symbols) from an initial OFDM symbol of an RB assigned to the UE 115, or the first offset may indicate an offset from a first DMRS symbol, and the second offset may indicate an offset from a second DMRS symbol.

[0109] In some implementations, the PTRS 566 includes a plurality of PTRSs with different powers. For example, the PTRS 566 may include a non-zero power (NZP) PTRS 568 and a zero power (ZP) PTRS 570. The transmitting node 550 may transmit the NZP PTRS 568 using one or more NZP PTRS ports assigned to a first set of symbols, a first one or more subcarriers, or a combination thereof, and the transmitting node 550 may transmit the ZP PTRS 570 using one or more ZP PTRS ports assigned to a second set of symbols, a second one or more subcarriers, or a combination thereof. Transmitting the ZP PTRS 570 via one or more ZP PTRS ports may include adjusting parameters of one or more components of a transmit path at the transmitting node 550, such as a power amplifier as a non-limiting example. Transmitting ZP PTRS 570 may reserve some resource elements (REs) of the RB for transmitting NZP PTRS to other UEs, or for other UEs to transmit NZP PTRS to UE 115 (e.g., via SL), which reduces interference from PTRS 566 to other PTRS transmitted by the transmitting node 550 or other UEs. As an example, in an implementation configured for multi-user multiple input multiple output (MU-MIMO), the transmitting node 550 (e.g., a network entity) may use the ZP PTRS port to allow the UE to vacate some REs of the RB in order to reduce interference to the NZP PTRS transmitted to other UEs. Because different UEs may have different DMRS configurations, different modes of ZP and NZP PTRS may be used. As another example, in an Industrial Internet of Things (IIOT) system, a transmitting node 550 (e.g., a programmable logic controller (PLC)) may schedule multiple other UEs (e.g., sensors and actuators, as non-limiting examples). Using both NZP PTRS ports and ZP PTRS ports may be beneficial to enhance the performance of the PLC and UE.

[0110] According to the reference Figure 7In some implementations where the DMRS 560 and PTRS 566 are allocated in a first configuration as described (e.g., the PTRS 566 is allocated to one or more symbols following a first DMRS symbol and to one or more subcarriers of a first subset of subcarriers to which a first set of DMRS 562 is allocated), the NZP PTRS 568 may be allocated to the first subset of the one or more symbols, and the ZP PTRS 570 may be allocated to a second subset of the one or more symbols. Such implementations include MU-MIMO implementations where the transmitting node 550 is a network entity, and the DMRS 560 and PTRS 566 are associated with the PDSCH 590. In some such implementations, the first subset of one or more symbols and the second subset of one or more symbols may be fixed across one or more of the first subset of subcarriers, as described with reference to FIG. Fig.10 Further described.

[0111] In some other implementations where DMRS 560 and PTRS 566 are allocated according to a first configuration, NZP PTRS 568 may be allocated to a first subset of one or more symbols and ZP PTRS 570 may be allocated to a second subset of one or more symbols. Such implementations include SL implementations where the transmitting node 550 is a second UE and the DMRS 560 and PTRS 566 are associated with PSSCH 592. In some such implementations, the first subset of one or more symbols and the second subset of one or more symbols may be fixed across one or more of the first subset of subcarriers, as described in reference to FIG. Fig.10 Further described.

[0112] According to the reference Figure 8In some implementations of the described second configuration allocating DMRS 560 and PTRS 566 (e.g., PTRS 566 is optionally allocated to a first set of symbols between a first DMRS symbol and a second DMRS symbol and one or more subcarriers of a first subset of subcarriers to which a first set of DMRS 562 is allocated, and to a second set of symbols after a second DMRS symbol and one or more subcarriers of a second subset of subcarriers), NZP PTRS 568 may be allocated to a first subset of the first set of symbols and a first subset of the second set of symbols, and ZP PTRS 570 may be allocated to a second subset of the first set of symbols and a second subset of the second set of symbols. The first subset of the first set of symbols and the second subset of the first set of symbols may be associated with one or more of the first subset of subcarriers, and the first subset of the second set of symbols and the second subset of the second set of symbols may be associated with a second subset of subcarriers. For example, NZP PTRS 568 and ZP PTRS 570 may each be allocated to subcarriers of a first subset of subcarriers and a second subset of subcarriers.

[0113] In some such implementations (e.g., MU-MIMO implementations in which the transmitting node 550 is a network entity and the DMRS 560 and the PTRS 566 are associated with the PDSCH 590), the transmitting node 550 may send the DCI 578 to the UE 115. The DCI 578 may include a field 580 indicating that the ZP PTRS 570 is associated with (e.g., allocated to) multiple subsets of subcarriers (e.g., at least a first subset of subcarriers and a second subset of subcarriers). In some implementations, the field 580 is a single bit having a first value indicating that the ZP PTRS 570 is not associated with (e.g., not allocated to) multiple subsets of subcarriers, or having a second value indicating that the ZP PTRS 570 is associated with (e.g., allocated to) multiple subsets of subcarriers. Additionally or alternatively, the DCI 578 may include an offset 582. For example, one or more fields or bits of the DCI 578 may indicate an offset 582. The offset 582 may include an offset for a second subset of the first set of symbols, an offset for a second subset of the second set of symbols, or both (e.g., offsets of symbols allocated to the ZP PTRS 570), for example, initial symbols of a reference RB. Alternatively, as described above, the offset for a second subset of the first set of symbols, the offset for a second subset of the second symbols, or both (e.g., offsets of symbols allocated to the ZP PTRS 570) may be indicated by the first predetermined value 508 and the first predetermined value 557, or the second predetermined value 510 and the second predetermined value 559, respectively.

[0114] In some other such implementations (e.g., in SL implementations where the transmitting node 550 is a second UE and the DMRS 560 and the PTRS 566 are associated with the PSSCH 592), the transmitting node 550 may transmit a sidelink control information 1 (SCI-1) 584 to the UE 115. The SCI-1 584 may include a field 586 indicating that the ZP PTRS 570 is associated with (e.g., allocated to) a plurality of subsets of subcarriers (e.g., at least a first subset of subcarriers and a second subset of subcarriers). In some implementations, the field 586 is a single bit having a first value indicating that the ZP PTRS 570 is not associated with (e.g., not allocated to) a plurality of subsets of subcarriers, or having a second value indicating that the ZP PTRS 570 is associated with (e.g., allocated to) a plurality of subsets of subcarriers. Additionally or alternatively, the SCI-1 584 may include an offset 588. For example, one or more fields or bits of SCI-1 584 may indicate offset 588. Offset 588 may include an offset for a second subset of a first set of symbols, an offset for a second subset of a second set of symbols, or both (e.g., offset(s) of symbols assigned to ZP PTRS 570), such as an initial symbol of a reference RB.

[0115] Instead of receiving SCI-1 584 from the transmitting node 550, the UE 115 may receive DCI from a base station that schedules SL transmissions between the UE 115 and the transmitting node 550 (e.g., a second UE) via the PSSCH 592. The DCI may be similar to the DCI 578 described above. For example, the DCI may include a field (including a single bit in some implementations) indicating whether the ZP PTRS 570 is associated with (e.g., allocated to) multiple subsets of subcarriers and / or (multiple) offsets of the ZP PTRS 570. Instead of receiving SCI-1 584 or DCI from the base station, as described above, the offset of the second subset of the first set of symbols, the offset of the second subset of the second symbols, or both (e.g., the offset (multiple) of symbols allocated to the ZP PTRS 570) may be indicated by the first predetermined value 508 and the first predetermined value 557, or the second predetermined value 510 and the second predetermined value 559, respectively.

[0116] According to the reference Fig. 9In some implementations of the third configuration described to allocate DMRS 560 and PTRS 566 (e.g., PTRS 566 is allocated to one or more symbols after the second DMRS symbol and to one or more subcarriers of the second subset of subcarriers to which the second set 564 of DMRS is allocated), NZP PTRS 568 may be allocated to the first subset of the one or more symbols and ZP PTRS 570 may be allocated to the second subset of the one or more symbols. Such implementations include MU-MIMO implementations in which the transmitting node 550 is a network entity and the DMRS 560 and PTRS 566 are associated with the PDSCH 590. In some such implementations, the first subset of one or more symbols and the second subset of one or more symbols may be fixed across one or more subcarriers of the first subset of subcarriers, similar to the reference 540. Fig.10 An implementation that allocates DMRS 560 and PTRS 566 according to the third configuration may not support SL implementation.

[0117] After receiving the DMRS 560 and the PTRS 566 from the transmitting node 550, the UE 115 may perform channel estimation based on the DMRS 560 and the PTRS 566. In some implementations, the UE 115 may receive a first set 562 of DMRS using a first antenna port 516 (e.g., an antenna port included in or associated with a first CDM group), and may receive a second set 564 of DMRS using a second antenna port 518 (e.g., an antenna port included in or associated with a second CDM group), and the UE 115 may perform channel estimation (sometimes referred to as, e.g., de-CDMing) using a first orthogonal cover code (OCC) of the first set 562 of DMRS and a second OCC of the second set 564 of DMRS. The UE 115 may multiply the DMRS sequence received on the first antenna port 516 by the first OCC to obtain a first expected DMRS sequence, and the UE 115 may multiply the DMRS sequence received on the second antenna port 518 by the second OCC to obtain a second expected DMRS sequence. The UE 115 may then perform DMRS processing on the first and second expected DMRS sequences. Additionally or alternatively, the UE 115 may perform channel estimation on the PTRS 566, including PTRS 566 reception, decoding, and processing. In some implementations, as described in reference Figure 4 As described, UE 115 may combine first antenna port 516 and second antenna port 518 into a single virtual port, and UE 115 may use the single virtual port to receive DMRS 560 and PTRS 566 and perform channel estimation. Figure 7The first configuration or reference described Fig. 9 In some implementations of the third configuration described to allocate DMRS 560 and PTRS 566, performing channel estimation includes interpolating phase between REs of the first set 562 of DMRS and the second set 564 of DMRS. Additionally or alternatively, the UE 115 can estimate phase noise and track phase variations from one symbol to another (e.g., from a first DMRS symbol to a second DMRS symbol or from a PTRS symbol to a second PTRS symbol) and adjust one or more oscillators of the UE 115 accordingly, such as to reduce a common phase error (CPE) or otherwise compensate for phase noise.

[0118] Performing channel estimation may cause the UE 115 to generate a channel estimate 594. In some implementations, the channel estimate 594 represents an estimate of the PDSCH 590. In some other implementations, the channel estimate 594 represents an estimate of the PSSCH 592. The UE 115 may use the channel estimate 594 when preparing a signal to be sent to the transmitting node 550. Additionally or alternatively, the UE 115 may send the channel estimate 594 to the transmitting node 550. The transmitting node 550 may use the channel estimate 594 when preparing a signal to be sent to the UE 115.

[0119] As reference Figure 5 As described, the present disclosure provides a technique for allocating DMRS and PTRS for transmission on a DL or SL for a wireless communication system configured to support a larger subcarrier spacing (such as 960 kHz, 1.92 MHz, or 3.84 MHz as a non-limiting example) that mitigates the effects of phase noise in higher frequency bands without degrading the accuracy of channel estimation and interpolation of reference signals to other subcarriers. For illustration, by allocating DMRS 560 including a first set 562 of DMRS and a second set 564 of DMRS to different OFDM symbols and subcarriers, the UE 115 can use one of the multiple DMRS 560 corresponding to the selected subcarrier to more accurately estimate the channel, rather than attempting to interpolate the DMRS for the subcarrier based on a single DMRS that may be allocated to a subcarrier with a significantly different frequency due to the larger subcarrier spacing. Supporting a larger subcarrier spacing can support a larger bandwidth, such as 2 GHz as a non-limiting example, with a reasonable FFT size. In addition, compared to other DMRS and PTRS designs for larger subcarrier spacing, the reference signal can be used to estimate the channel more accurately. Figure 5The described techniques may reduce the impact on the phase noise correction process at the UE 115 that receives the DMRS 560 and the PTRS 566. For example, because the PTRS 566 is aligned with at least some of the DMRS 560 (or offset based on a predefined offset), the UE 115 may estimate and compensate for phase noise with less complexity and greater accuracy than if the PTRS 566 is not aligned with at least some of the DMRS 560.

[0120] Figure 6 6 is a block diagram of an example wireless communication system 600 for implementing communication of multiple DMRSs in a UL and a PTRS aligned with at least one of the multiple DMRSs according to some aspects. The wireless communication system 600 includes a UE 115 and a network entity 650. In some implementations, as illustrative, non-limiting examples, the network entity 650 may include or correspond to a base station, such as a base station 105, a network, a network core, or another network device. Although one UE 115 and one network entity 650 are shown, in some other implementations, the wireless communication system 600 may generally include multiple UEs 115 and may include more than one network entity 650.

[0121] As reference Figure 5 As described, UE 115 includes a processor 502, a memory 504, an antenna port 514, a transmitter 520, and a receiver 522. The network entity 650 may include various components (such as structures, hardware components) for performing one or more functions described herein. For example, these components may include a processor 652, a memory 654, a transmitter 656, and a receiver 658. The processor 652 may be configured to execute instructions stored in the memory 654 to perform the operations described herein. In some implementations, the processor 652 includes or corresponds to the controller / processor 240, and the memory 654 includes or corresponds to the memory 242.

[0122] In some implementations, the memory 654 may be configured to store a predetermined value 655. The predetermined value 655 may include a plurality of predetermined values ​​indicating an offset of a PTRS associated with a configuration of a DMRS, one or more combs for communicating a DMRS, or a combination thereof. In some embodiments, the predetermined value 655 includes at least a first predetermined value 657 and a second predetermined value 659.

[0123] The transmitter 656 is configured to send reference signals, synchronization signals, control information, and data to one or more other devices, and the receiver 658 is configured to receive reference signals, control information, and data from one or more other devices. For example, the transmitter 656 can send signaling, control information, and data, and the receiver 658 can receive signaling, control information, and data via a network, such as a wired network, a wireless network, or a combination thereof. For example, the network entity 650 can be configured to send or receive data via a direct device-to-device connection, a LAN, a WAN, a modem-to-modem connection, the Internet, an intranet, an extranet, a cable transmission system, a cellular communication network, any combination of the above, or any other communication network now known or later developed that allows two or more electronic devices to communicate therein. In some implementations, the transmitter 656 and the receiver 658 can be integrated into a transceiver. Additionally or alternatively, the transmitter 656, the receiver 658, or both can include and correspond to the reference Figure 2 One or more components of base station 105 are described.

[0124] In some implementations, the wireless communication system 600 implements a 5G NR network. For example, the wireless communication system 600 may include a plurality of 5G-capable UEs 115 and a plurality of 5G-capable network entities 650, such as UEs and network entities configured to operate according to a 5G NR network protocol such as defined by 3GPP.

[0125] During operation of the wireless communication system 600, the UE 115 may transmit a plurality of DMRS 660 to the network entity 650. The DMRS 660 may include a first set 662 of DMRSs allocated to a first DMRS symbol and a first subset of subcarriers, and a second set 664 of DMRSs allocated to a second DMRS symbol and a second subset of subcarriers. For example, the UE 115 may allocate one or more DMRSs across a first subset of subcarriers to a first OFDM symbol (e.g., a first DMRS symbol), and the UE 115 may allocate one or more other DMRSs across a second subset of subcarriers to a second OFDM symbol (e.g., a second DMRS symbol). As a specific, non-limiting example, the UE 115 may allocate the first set 662 of DMRSs to OFDM symbol 3 and odd subcarriers (e.g., subcarriers indexed as 1, 3, 5, etc.), and the network entity 650 may allocate the second set 664 of DMRSs to OFDM symbol 4 and even subcarriers (e.g., subcarriers indexed as 2, 4, 6, etc.). In some implementations, as a non-limiting example, the first DMRS symbol and the second DMRS symbol are consecutive symbols, such as OFDM symbol 3 and OFDM symbol 4. In some other implementations, as a non-limiting example, the first DMRS symbol and the second DMRS symbol are non-consecutive DMRS symbols, such as OFDM symbol 3 and OFDM symbol 7. Figure 7-10 Other details related to assigning DMRS to various OFDM symbols and subcarriers are described. Although the assignment of a first OFDM symbol to a second OFDM symbol is described, this description is not limiting. In some other implementations, the first set 662 of DMRS can be associated with (e.g., assigned to) a first group of OFDM symbols (e.g., a first group of DMRS symbols), the second set 664 of DMRS can be associated with (e.g., assigned to) a second group of OFDM symbols (e.g., a second group of DMRS symbols), or both.

[0126] The first set 662 of DMRS and the second set 664 of DMRS may each be sent using one or more DMRS ports. For example, UE 115 may send the first set 662 of DMRS using a first DMRS port (or a first DMRS port group), and UE 115 may send the second set 664 of DMRS using a second DMRS port (or a second DMRS port group) different from the first DMRS port. Figure 7-10 The use of different DMRS ports is further described.

[0127] In some implementations, different DMRS may be associated with different antenna ports of the UE 115, although effectively only one DMRS port may be used to transmit the DMRS to the UE 115 (e.g., a staggered DMRS pattern may be formed by transmitting the DMRS on different symbols according to the RE allocations of the different configured ports, such that effectively only one port is transmitted). For example, a first set 662 of DMRS may be associated with the first antenna port 516, and a second set 664 of DMRS may be associated with the second antenna port 518. In some such implementations, the first antenna port 516 may be included in (or associated with) a first CDM group configured for the UE 115, and the second antenna port 518 may be included in (or associated with) a second CDM group configured for the UE 115. For illustration, the network entity 650 may send a DMRS configuration to the UE 115. The DMRS configuration may be included in a configuration message, such as an RRC message. The DMRS configuration may indicate one or more CDM groups configured for the UE 115, and corresponding DMRS ports included in each CDM group. For example, the DMRS configuration may indicate a first CDM group including at least DMRS port 0 (corresponding to the first antenna port 516) and a second CDM group including at least DMRS port 2 (corresponding to the second antenna port 518). Before transmitting the DMRS 660, the network entity 650 may send an indication of one or more antenna ports to the UE 115, which are included in the one or more CDM groups and are allocated to the UE 115 for transmitting the DMRS 660. For example, the indication may indicate that a first port (e.g., DMRS port 0, corresponding to the first antenna port 516) included in the first CDM group is allocated to the UE 115 for transmitting a first set 662 of DMRS, and a second port (e.g., DMRS port 2, corresponding to the second antenna port 518) in the second CDM group is allocated to the UE 115 for transmitting a second set 664 of DMRS. These antenna ports (e.g., DMRS ports corresponding to the first antenna port 516 and the second antenna port 518) may be referred to as allocated DMRS ports or scheduled DMRS ports.

[0128] In some implementations, the indicated ports for sending DMRS transmissions may be assigned for one or more resource blocks (RBs) to the UE 115. For example, the indicated DMRS ports may be used to send DMRS transmissions in a group of RBs included in a resource allocation scheduled for the UE 115 (e.g., for one or more physical uplink shared channels (PUSCH communications)). In some implementations, the DMRS port, the group of RBs, the resource allocation, or a combination thereof may be included in the DCI.

[0129] The UE 115 may use the antenna port 514 to transmit the DMRS 660. For example, the UE 115 may use the first antenna port 516 (e.g., an antenna port included in or corresponding to the first CDM group) to transmit the first set 662 of DMRS, and the UE 115 may use the second antenna port 518 (e.g., an antenna port included in or corresponding to the second CDM group) to transmit the second set 664 of DMRS. In some implementations, the UE 115 may combine the first antenna port 516 and the second antenna port 518 into a single virtual port for transmitting the DMRS 660 (e.g., both the first set 662 of DMRS and the second set 664 of DMRS). For example, as described in reference Figure 4 As described, the UE 115 may combine the first antenna port 516 and the second antenna port 518 into a single virtual port. In some such implementations, the indication of the allocated DMRS ports from the network entity 650 may also indicate that two or more allocated DMRS ports are to be combined into a corresponding virtual port. As non-limiting examples, the indication may be included in a configuration message (e.g., an RRC message), a DCI, an activation DCI, or a MAC-CE.

[0130] In addition to transmitting DMRS 660, UE 115 may also transmit PTRS 666 to UE 115. PTRS 666 may be associated with DMRS 660. For example, UE 115 may assign PTRS 666 (or multiple PTRS) to OFDM symbols (also referred to as PTRS symbols) and subcarriers such that PTRS 666 is aligned with at least one of DMRS 660. UE 115 may use one or more PTRS ports to transmit PTRS 666, similar to the DMRS ports used to transmit DMRS 660. For example, different PTRS ports may be assigned to different OFDM symbols, different subcarriers, or both. In some embodiments, different PTRS ports may have different powers, such as zero power or non-zero power, as further described herein.

[0131] In some implementations, the PTRS 666 is allocated to one or more symbols after the first DMRS symbol to which the first set 662 of DMRS is allocated and to one or more subcarriers of the first subset of subcarriers to which the first set 662 of DMRS is allocated. For example, the DMRS 660 and the PTRS 666 may be allocated according to the first configuration, as shown in FIG. Figure 7In some other implementations, the PTRS 666 is optionally allocated to a first set of symbols between the first DMRS symbol and the second DMRS symbol (to which the second set 664 of DMRS is allocated) and one or more subcarriers of the first set of subcarriers, and allocated to a second set of symbols after the second DMRS symbol and one or more subcarriers of the second subset of subcarriers (to which the second set 664 of DMRS is allocated). For example, the DMRS 660 and the PTRS 666 may be allocated according to the second configuration, as described in reference to Figure 8 In some other implementations, PTRS 666 is allocated to one or more symbols after the second DMRS symbol and one or more subcarriers of the second subset of subcarriers. For example, DMRS 660 and PTRS 666 may be allocated according to a third configuration, as described in reference to Fig. 9 Further described.

[0132] The DMRS 660 and PTRS 666 may be associated with one or more types of channels between the network entity 650 and the UE 115 and enable the network entity 650 to determine channel estimates corresponding to the one or more types of channels. In some implementations, the DMRS 660 and PTRS 666 are associated with the PUSCH 684 between the UE 115 and the network entity 650. In such implementations, the DMRS 660 and PTRS 666 may be allocated according to the first configuration, the second configuration, or the third configuration.

[0133] In some implementations of allocating DMRS 660 and PTRS 666 according to the second configuration, UE 115 may signal an offset associated with the allocation of PTRS 666 to network entity 650. For example, UE 115 may send a higher layer parameter 672 to UE 115. The higher layer parameter 672 may be included in a message, such as an RRC message, a MAC-CE, or some other signal or message. In some implementations, the higher layer parameter 672 is defined as a "resourceElementoffset" parameter. The higher layer parameter 672 may include a first higher layer parameter 674 associated with a first set 662 of DMRS and a second higher layer parameter 676 associated with a second set 664 of DMRS. The first higher layer parameter 674 may indicate a first offset of a first set of symbols to which PTRS 666 is allocated, and the second higher layer parameter 676 may indicate a second offset of a second set of symbols to which PTRS 666 is also allocated. As non-limiting examples, the first offset and the second offset may indicate an offset (in symbols) from an initial OFDM symbol of the RB allocated to UE115, or the first offset may indicate an offset from a first DMRS symbol (to which the first set 662 of DMRS is allocated), and the second offset may indicate an offset from a second DMRS symbol (to which the second set 664 of DMRS is allocated).

[0134] In some other implementations of allocating DMRS 660 and PTRS 666 according to the second configuration, the offset associated with the allocation of PTRS 666 may be determined based on a predetermined value 506 stored at UE 115 (e.g., at memory 504) or a predetermined value 655 stored at network entity 650 (e.g., at memory 654). For illustration, the predetermined value 506 and the predetermined value 655 may indicate a plurality of offsets corresponding to a configuration of DMRS (and PTRS), a comb for communicating DMRS (and PTRS), or a combination thereof. The UE 115 and the network entity 650 may determine the offset associated with the allocation of PTRS 666 by accessing the predetermined value 506 or the predetermined value 655, respectively, and matching the configuration of DMRS 660 and PTRS 666, a comb (e.g., comb 512) for communicating DMRS 660 and PTRS 666, or both, with the configuration, comb, or both associated with one or more of the predetermined value 506 or the predetermined value 655. The predetermined value 506 may include a first predetermined value 508 indicating a first offset for a first set of symbols to which the PTRS 666 is assigned, and a second predetermined value 510 indicating a second offset for a second set of symbols to which the PTRS 666 is assigned. Similarly, the predetermined value 655 may include a first predetermined value 657 indicating a first offset for the first set of symbols, and a second predetermined value 659 indicating a second offset for the second set of symbols. As non-limiting examples, the first offset and the second offset may indicate an offset (in symbols) from an initial OFDM symbol of an RB assigned to the UE 115, or the first offset may indicate an offset from a first DMRS symbol and the second offset may indicate an offset from a second DMRS symbol.

[0135] In some implementations, the PTRS 666 includes multiple PTRSs with different powers. For example, the PTRS 666 may include a non-zero power (NZP) PTRS 668 and a zero power (ZP) PTRS 670. The UE 115 may use one or more NZP PTRS ports assigned to a first set of symbols, a first one or more subcarriers, or a combination thereof to send the NZP PTRS 668, and the UE 115 may use one or more ZP PTRS ports assigned to a second set of symbols, a second one or more subcarriers, or a combination thereof to send the ZP PTRS 670. Sending the ZP PTRS 670 via the one or more ZP PTRS ports may include adjusting parameters of one or more components of a transmission path at the UE 115, such as a power amplifier as a non-limiting example. Sending the ZP PTRS 670 may reserve some REs of the RB for other UEs to send the NZP PTRS to the network entity 650, which reduces interference from the PTRS 666 to other PTRSs sent by other UEs. As a non-limiting example, in an implementation configured for MU-MIMO, UE 115 may use the ZP PTRS port to allow network entity 650 to vacate some REs of the RB in order to reduce interference to NZP PTRS transmitted by other UEs. Because different UEs may have different DMRS configurations, different patterns of ZP and NZP PTRS may be used.

[0136] According to the reference Figure 7 In some implementations where the DMRS 660 and PTRS 666 are allocated in a first configuration as described (e.g., the PTRS 666 is allocated to one or more symbols following a first DMRS symbol and one or more subcarriers of a first subset of subcarriers to which a first set of DMRS 662 is allocated), the NZP PTRS 668 may be allocated to the first subset of the one or more symbols, and the ZP PTRS 670 may be allocated to a second subset of the one or more symbols. Such implementations include MU-MIMO implementations where the DMRS 660 and PTRS 666 are associated with the PUSCH 684. In some such implementations, the first subset of one or more symbols and the second subset of one or more symbols may be fixed across one or more subcarriers of the first subset of subcarriers, as described with reference to FIG. Fig.10 Further described.

[0137] According to the reference Figure 8In some implementations of the described second configuration allocating DMRS 660 and PTRS 666 (e.g., PTRS 666 is optionally allocated to a first set of symbols between a first DMRS symbol and a second DMRS symbol and one or more subcarriers of a first subset of subcarriers to which a first set of DMRS 662 is allocated, and to a second set of symbols after a second DMRS symbol and one or more subcarriers of a second subset of subcarriers), NZ PTRS 668 may be allocated to a first subset of the first set of symbols and a first subset of the second set of symbols, and ZP PTRS 670 may be allocated to a second subset of the first set of symbols and a second subset of the second set of symbols. The first subset of the first set of symbols and the second subset of the first set of symbols may be associated with one or more of the first subset of subcarriers, and the first subset of the second set of symbols and the second subset of the second set of symbols may be associated with a second subset of subcarriers. For example, NZP PTRS 668 and ZP PTRS 670 may each be allocated to subcarriers of a first subset of subcarriers and a second subset of subcarriers.

[0138] In some such implementations, the UE 115 may send uplink control information (UCI) 678 to the network entity 650. The UCI 678 may include a field 680 indicating that the ZP PTRS 670 is associated with (e.g., allocated to) multiple subsets of subcarriers (e.g., at least a first subset of subcarriers and a second subset of subcarriers). In some implementations, the field 680 is a single bit having a first value indicating that the ZP PTRS 670 is not associated with (e.g., not allocated to) multiple subsets of subcarriers, or having a second value indicating that the ZP PTRS 670 is associated with (e.g., allocated to) multiple subsets of subcarriers. Additionally or alternatively, the UCI 678 may include an offset 682. For example, one or more fields or bits of the UCI 678 may indicate the offset 682. The offset 682 may include an offset for a second subset of the first set of symbols, an offset for a second subset of the second set of symbols, or both (e.g., offsets of symbols assigned to the ZP PTRS 670), such as initial symbols of the reference RB. Alternatively, as described above, the offset for the second subset of the first set of symbols, the offset for the second subset of the second symbols, or both (e.g., offsets of symbols assigned to the ZP PTRS 670) may be indicated by the first predetermined value 508 and the first predetermined value 657, or the second predetermined value 510 and the second predetermined value 659, respectively.

[0139] According to the reference Fig. 9In some implementations of the third configuration described to allocate DMRS 660 and PTRS 666 (e.g., PTRS 666 is allocated to one or more symbols after the second DMRS symbol and one or more subcarriers of the second subset of subcarriers to which the second set of DMRS 664 is allocated), NZP PTRS 668 can be allocated to the first subset of one or more symbols, and ZP PTRS 670 can be allocated to the second subset of one or more symbols. In some such implementations, the first subset of one or more symbols and the second subset of one or more symbols can be fixed across the one or more subcarriers of the first subset of subcarriers, similar to the reference numerals 664 and 666. Fig.10 As described.

[0140] After receiving DMRS 660 and PTRS 666 from UE 115, network entity 650 may perform channel estimation based on DMRS 660 and PTRS 666, similar to reference Figure 6 Additionally or alternatively, the network entity 650 may track phase changes from one symbol to another (e.g., from a first DMRS symbol to a second DMRS symbol, or from a PTRS symbol to a second PTRS symbol) and adjust one or more oscillators of the network entity 650 accordingly. Performing channel estimation may cause the network entity 650 to generate a channel estimate 686. The channel estimate 686 may represent an estimate of the PUSCH 684. The network entity 650 may use the channel estimate 686 when preparing a signal to be sent to the UE 115. Additionally or alternatively, the network entity 650 may send the channel estimate 686 to the UE 115. The UE 115 may use the channel estimate 686 when preparing a signal to be sent to the network entity 650.

[0141] As reference Figure 6 As described, the present disclosure provides a technique for allocating DMRS and PTRS transmitted on the UL for a wireless communication system configured with a larger subcarrier spacing. A larger subcarrier spacing can support a larger bandwidth, such as 2 GHz, with a reasonable FFT size. In addition, compared with other DMRS and PTRS designs for larger subcarrier spacing, reference Figure 6 The described techniques may reduce the impact on the phase noise correction process at a wireless device receiving DMRS and PTRS.

[0142] Figure 7700 is a diagram showing a first example 700 associated with a DMRS and PTRS design for large subcarrier spacing according to some aspects. In a wireless communication system such as wireless communication systems 500-600, multiple DMRS ports can be used to transmit on the same OFDM symbol using CDM and FDM. Using FDM, different DMRS ports can be used to transmit DMRS on the same OFDM symbol by using different subcarriers (e.g., tones) for different DMRS ports. Using CDM, different DMRS ports can be used to transmit DMRS on the same OFDM symbol (or across a set of OFDM symbols on the same subcarrier) by using different OCCs for different DMRS ports. DMRS ports for transmitting on the same subcarrier belong to the same CDM group, and DMRS ports for transmitting on different subcarriers belong to different CDM groups. In other words, a CDM group includes a group of DMRS ports for transmitting a corresponding set of DMRS on the same subcarrier, wherein different OCCs are used for (e.g., scrambling) transmissions on different DMRS ports included in the group of DMRS ports. Additionally, one or more PTRS ports may be used to transmit PTRS on one or more OFDM symbols across one or more subcarriers.

[0143] Figure 7 The first example 700 shown in FIG. 1 is shown for an RB configured for a UE, such as UE 115. An RB includes a plurality of OFDM symbols (e.g., symbols indexed 0-13, shown on the horizontal axis) and a plurality of subcarriers (e.g., subcarriers indexed 0-11, shown on the vertical axis). In some implementations, one or more REs of an RB may be reserved or allocated for purposes other than reference signal transmission, as shown by symbols 0 and 1 across all subcarriers 0-13. As described above, reference signals may be transmitted to the RB. Figure 7 The described examples may be applied to DMRS and PTRS associated with PDSCH, PUSCH, or PSSCH.

[0144] like Figure 7As shown, the first configuration of DMRS and PTRS can support up to two CDM groups, with different CDM groups being used for different symbols. This configuration of different DMRS ports (or CDM groups) to different symbols may also be referred to as an "interleaved DMRS configuration." In this configuration, a first CDM group (CDM group 0) may occupy a first set or a first subset of subcarriers on a first symbol (also referred to as a first DMRS symbol), and a second CDM group (CDM group 1) may occupy a second set or a second subset of subcarriers on a second symbol (also referred to as a second DMRS symbol). The first CDM group may include multiple DMRS ports, such as DMRS port 0 (shown as port 1000), and the second CDM group may also include multiple DMRS ports, such as DMRS port 2 (shown as port 1002). Although Figure 7 Only one DMRS port of each CDM group is shown, but in other implementations, each CDM group may include two or more DMRS ports. In some implementations, a first CDM group (e.g., DMRS port 0) may be used to send a first set 562 of DMRS and / or a first set 662 of DMRS, and a second CDM group (e.g., DMRS port 1) may be used to send a second set 564 of DMRS and / or a second set 664 of DMRS, as shown in FIG. Figure 5-6 described.

[0145] In some implementations, as shown in reference numeral 705, the DMRS symbols allocated according to the first configuration may span two adjacent (e.g., consecutive) symbols. In this case, the first CDM group (CDM group 0) may occupy a first set or a first subset of subcarriers on a first symbol (shown as symbol 2), and the second CDM group (CDM group 1) may occupy a second set or a second subset of subcarriers on a second symbol (shown as symbol 3). Figure 7 In the example of , the first subset of subcarriers includes even subcarriers (e.g., subcarriers 0, 2, 4, 6, 8, and 10), and the second subset of subcarriers includes odd subcarriers (e.g., subcarriers 1, 3, 5, 7, 9, and 11). In an implementation where each CDM group includes multiple DMRS ports (e.g., CDM group 0 includes port 1000 and port 1001, and CDM includes port 1002 and port 1003), the first subset of subcarriers can be allocated among the multiple DMRS ports of CDM group 0 (e.g., port 1000 can be allocated to symbol 2 on subcarriers 0, 2, and 4, and port 1001 can be allocated to symbol 2 on subcarriers 6, 8, and 10), and the second subset of subcarriers can be allocated among the multiple DMRS ports of CDM group 1 (e.g., port 1002 can be allocated to symbol 3 on subcarriers 1, 3, and 5, and port 1003 can be allocated to symbol 3 on subcarriers 7, 9, and 11).

[0146] In addition, the PTRS allocated according to the first configuration may be allocated to one or more symbols after the first DMRS symbol. As shown in reference numeral 705, when DMRS symbols are allocated to consecutive symbols (shown as symbols 2 and 3), the PTRS may be allocated to one or more symbols (shown as symbols 4-13) after the first DMRS symbol and also after the second DMRS symbol. In this example, the offset of the PTRS may be 4 (e.g., the PTRS is offset by 4 symbols from the initial symbol). Although the PTRS is shown as being allocated to all remaining symbols of the RB after the DMRS symbol (e.g., symbols 4-13), in other implementations, the PTRS may be allocated only to a subset of the remaining symbols, such as, as non-limiting examples, every other symbol, every other symbol, every other symbol, every other symbol, or every other symbol. As shown in FIG. Figure 7 As shown, the PTRS may be assigned to a single subcarrier of a first subset of subcarriers, such as a first subcarrier (shown as subcarrier 0) of a first subset of subcarriers (e.g., even subcarriers). In other implementations, the PTRS may be assigned to different subcarriers of the first subset of subcarriers, or more than one subcarrier of the first subset of subcarriers, such as every subcarrier, every other subcarrier, or every third subcarrier of the first subset of subcarriers, as non-limiting examples.

[0147] Alternatively, as shown by reference numeral 710, the DMRS ports allocated according to the first configuration may span two non-adjacent (e.g., non-contiguous) symbols (e.g., a single-symbol DMRS configuration with an additionally configured DMRS symbol). In this case, the first CDM group (CDM group 0) may occupy a first set or a first subset of subcarriers on a first symbol (shown as even subcarriers on symbol 2), and the second CDM group (CDM group 1) may occupy a second set or a second subset of subcarriers on a second symbol (shown as odd subcarriers on symbol 7), wherein the first symbol and the second symbol are non-contiguous symbols.

[0148] When DMRS symbols are assigned to non-contiguous symbols, the PTRS assigned according to the first configuration may be assigned to a first set of symbols between the first DMRS symbol and the second DMRS symbol and a second set of symbols after the second DMRS symbol. As shown in reference numeral 710, when DMRS symbols are assigned to non-contiguous symbols (shown as symbols 2 and 7), the PTRS may be assigned to a first set of symbols between the first DMRS symbol and the second DMRS symbol (shown as symbols 3-6) and a second set of symbols after the second DMRS symbol (shown as symbols 8-13). In this case, the PTRS may be associated with offset 3 and offset 8. Although the PTRS is shown as being assigned to all remaining symbols of the RB that are not assigned to DMRS symbols (e.g., symbols 3-6 and 8-13), in other implementations, the PTRS may be assigned only to a subset of the remaining symbols, such as, as non-limiting examples, every other symbol, every other symbol, every other symbol, every other symbol, or every other symbol. As shown in FIG. Figure 7 As shown, the PTRS may be assigned to a single subcarrier of the first subset of subcarriers, such as the first subcarrier (shown as subcarrier 0) of the first subset of subcarriers (e.g., even subcarriers). In other implementations, as non-limiting examples, the PTRS may be assigned to different subcarriers of the first subset of subcarriers, or more than one subcarrier of the first subset of subcarriers, such as each subcarrier, every other subcarrier, or every third subcarrier of the first subset of subcarriers.

[0149] In some implementations, the first configuration corresponds to a fixed PTRS pattern that does not change regardless of changes to the DMRS pattern (e.g., assigning different DMRS ports or CDM groups to different symbols). In such implementations, the phase tracking algorithm may be modified to interpolate phases between different DMRS REs. This enables the PTRS port to be aligned with the first DMRS symbol. In some such implementations, the DMRS port assigned to the first DMRS symbol is a DMRS port with a lowest index that complies with one or more wireless communication standards, such as the 3GPP wireless communication standard. To further illustrate, the DMRS port (e.g., port 1000) assigned to the first DMRS symbol may have a lowest index of a plurality of DMRS ports (e.g., other DMRS ports included in the first CDM group and a DMRS port included in the second CDM group), which may correspond to a first set of DMRS associated with an antenna port (e.g., first antenna port 516) having a lowest index among a plurality of antenna ports (e.g., antenna port 514) configured to receive DMRS at UE 115.

[0150] In some implementations, when the first configuration is used, multiple DMRS ports can be combined into a single virtual port, as described elsewhere herein. In this way, denser DMRS coverage in the frequency domain can be achieved. In addition, multiple DMRS symbols using a traditional DMRS configuration can be assigned different DMRS ports. Multiple DMRS symbols can be continuous or non-continuous.

[0151] Figure 8 is a diagram illustrating a second example 800 associated with DMRS and PTRS design for large subcarrier spacing in accordance with some aspects. Figure 8 A second configuration of DMRS and PTRS allocation is shown. As described above, the second configuration can be applied to DMRS and PTRS associated with PDSCH, PUSCH or PSSCH. Figure 7 Different DMRS ports (or CDM groups including multiple DMRS ports) may be assigned to different symbols (e.g., consecutive symbols or non-consecutive symbols) and different subsets of subcarriers. PTRS may optionally be assigned to a first set of symbols between a first DMRS symbol and a second DMRS symbol, and one or more subcarriers of a first subset of subcarriers, and PTRS may be assigned to a second set of symbols after a second DMRS symbol, and one or more subcarriers of a second subset of subcarriers.

[0152] In some implementations, the DMRS symbols allocated according to the second configuration may span two adjacent (e.g., consecutive) symbols, as shown by reference numeral 805. In this case, the first CDM group (at least CDM group 0 including DMRS port 1000) may occupy a first set or a first subset of subcarriers on the first symbol (shown as even subcarriers on symbol 2), and the second CDM group (at least CDM group 1 including DMRS port 1002) may occupy a second set or a second subset of subcarriers on the second symbol (shown as odd subcarriers on symbol 3).

[0153] As shown in reference numeral 805, when DMRS symbols are assigned to consecutive symbols (shown as symbols 2 and 3), PTRS is not assigned to a first set of symbols (e.g., between a first DMRS symbol and a second DMRS symbol), but is only assigned to a second set of symbols after the second DMRS symbol (shown as symbols 4-13). Although PTRS is shown as being assigned to all remaining symbols of the RB after the DMRS symbol (e.g., symbols 4-13), in other implementations, PTRS may be assigned to only a subset of the remaining symbols, such as every other symbol, every other symbol, every other symbol, every other symbol, every other symbol, as a non-limiting example. Figure 8As shown, the PTRS may be allocated to a single subcarrier of the second subset of subcarriers, such as the first subcarrier (shown as subcarrier 1) of the second subset of subcarriers (e.g., odd subcarriers). In other implementations, as non-limiting examples, the PTRS may be allocated to different subcarriers of the second subset of subcarriers, or more than one subcarrier of the second subset of subcarriers, such as each subcarrier, every other subcarrier, or every third subcarrier of the second subset of subcarriers.

[0154] Alternatively, as shown by reference numeral 810, the DMRS ports allocated according to the second configuration may span two non-adjacent (e.g., non-contiguous) symbols (e.g., a single-symbol DMRS configuration with an additionally configured DMRS symbol). In this case, the first CDM group (CDM group 0) may occupy a first set or a first subset of subcarriers on a first symbol (shown as even subcarriers on symbol 2), and the second CDM group (CDM group 1) may occupy a second set or a second subset of subcarriers on a second symbol (shown as odd subcarriers on symbol 7), wherein the first symbol and the second symbol are non-contiguous symbols.

[0155] When DMRS symbols are allocated to non-contiguous symbols, the PTRS allocated according to the second configuration may be allocated to a first set of symbols between the first DMRS symbol and the second DMRS symbol and a second set of symbols after the second DMRS symbol. As shown in reference numeral 810, when DMRS symbols are allocated to non-contiguous symbols (shown as symbols 2 and 7), the PTRS may be allocated to a first set of symbols between the first DMRS symbol and the second DMRS symbol (shown as symbols 3-6) and a second set of symbols after the second DMRS symbol (shown as symbols 8-13). Although the PTRS is shown as being allocated to all remaining symbols of the RB that are not allocated to DMRS symbols (e.g., symbols 3-6 and 8-13), in other implementations, the PTRS may be allocated only to a subset of the remaining symbols, such as, as non-limiting examples, every other symbol, every other symbol, every other symbol, every other symbol, or every other symbol. As shown in FIG. Figure 8 As shown, the PTRS may be assigned to a first set of symbols on a single subcarrier (shown as subcarrier 0) of a first subset of subcarriers, and a second set of symbols on a single subcarrier (shown as subcarrier 1) of a second subset of subcarriers. In other implementations, as non-limiting examples, the PTRS may be assigned to different subcarriers of a subset of subcarriers, or more than one subcarrier of each subset of subcarriers, such as each subcarrier, every other subcarrier, or every third subcarrier of a subset of subcarriers.

[0156] In some implementations, the second configuration corresponds to a "staggered PTRS pattern" that is aligned with both the REs of the first DMRS symbol and the REs of the second DMRS symbol. For example, at least some of the REs allocated to the PTRS are shifted to align with the second DMRS symbol, and are shifted to subcarriers of the second subset of subcarriers. In such an implementation, it may not be necessary to modify the phase tracking algorithm to interpolate the phases between different DMRS REs. As described in reference Figure 5-6 As described above, higher layer parameters associated with PTRS may be used to indicate that the PTRS spans multiple subsets and offsets of subcarriers of a first set of symbols and a second set of symbols. In some implementations, the PTRS may be allocated to avoid REs allocated for direct current (DC) tone transmissions, as described in reference to Fig.10 Further described.

[0157] In some implementations, when the second configuration is used, multiple DMRS ports can be combined into a single virtual port, as described elsewhere herein. In this way, denser DMRS coverage in the frequency domain can be achieved. In addition, multiple DMRS symbols using a traditional DMRS configuration can be assigned different DMRS ports. Multiple DMRS symbols can be continuous or non-continuous.

[0158] Fig. 9 is a diagram illustrating a third example 900 associated with DMRS and PTRS design for large subcarrier spacing in accordance with some aspects. Fig. 9 A third configuration of DMRS and PTRS allocation is shown. As described above, the third configuration can be applied to DMRS and PTRS associated with PDSCH or PUSCH. Figure 7 Different DMRS ports (or CDM groups including multiple DMRS ports) can be assigned to different symbols (e.g., consecutive symbols or non-consecutive symbols) and different subsets of subcarriers. PTRS can be assigned to one or more symbols after the second DMRS symbol and one or more subcarriers of the second subset of subcarriers.

[0159] In some implementations, the DMRS symbols allocated according to the second configuration may span two adjacent (e.g., consecutive) symbols, as shown by reference numeral 905. In this case, the first CDM group (at least CDM group 0 including DMRS port 1000) may occupy a first set or a first subset of subcarriers on the first symbol (shown as even subcarriers on symbol 2), and the second CDM group (at least CDM group 1 including DMRS port 1002) may occupy a second set or a second subset of subcarriers on the second symbol (shown as odd subcarriers on symbol 3).

[0160] As shown in reference numeral 905, when DMRS symbols are assigned to consecutive symbols (shown as symbols 2 and 3), PTRS may be assigned to one or more symbols after the second DMRS symbol (shown as symbols 4-13). Although PTRS is shown as being assigned to all remaining symbols of the RB after the DMRS symbol (e.g., symbols 4-13), in other implementations, PTRS may be assigned to only a subset of the remaining symbols, such as every other symbol, every other symbol, every other symbol, every other symbol, every other symbol, as a non-limiting example. Fig. 9 As shown, the PTRS may be allocated to a single subcarrier of the second subset of subcarriers, such as the first subcarrier (shown as subcarrier 1) of the second subset of subcarriers (e.g., odd subcarriers). In other implementations, as non-limiting examples, the PTRS may be allocated to different subcarriers of the second subset of subcarriers, or more than one subcarrier of the second subset of subcarriers, such as each subcarrier, every other subcarrier, or every third subcarrier of the second subset of subcarriers.

[0161] In a third configuration, as shown by reference numeral 905, the PTRS is aligned with a DMRS port that does not have the lowest index among the allocated DMRS ports. For example, the PTRS is aligned with port 1002, which has a higher index than port 1000. This may include or correspond to a PTRS associated with an antenna port (e.g., second antenna port 518) that does not have the lowest index (or may have the highest index) among a plurality of antenna ports (e.g., antenna port 514) at UE 115. In some implementations, the DMRS is aligned with a DMRS port having the lowest antenna index among the DMRS ports included in the second CDM group. In other implementations, the PTRS is aligned with a different DMRS port of the second CDM group, such as a DMRS port having the highest index of the second CDM group.

[0162] Alternatively, DMRS and PTRS may be allocated according to an alternative third configuration. As shown in reference numeral 910, the DMRS ports allocated according to the alternative third configuration may span two adjacent (e.g., consecutive) symbols, with the DMRS port with the lowest index being allocated to the second symbol. In this case, the first CDM group (CDM group 0) may occupy a first set or a first subset of subcarriers on the second symbol (shown as even subcarriers on symbol 3), and the second CDM group (CDM group 1) may occupy a second set or a second subset of subcarriers on the first symbol (shown as odd subcarriers on symbol 2).

[0163] When DMRS symbols are allocated to non-contiguous symbols, the PTRS allocated according to the second configuration may be allocated to both a first set of symbols between the first DMRS symbol and the second DMRS symbol and a second set of symbols after the second DMRS symbol. As shown in reference numeral 810, when DMRS symbols are allocated to non-contiguous symbols (shown as symbols 2 and 7), the PTRS may be allocated to a first set of symbols between the first DMRS symbol and the second DMRS symbol (shown as symbols 3-6) and a second set of symbols after the second DMRS symbol (shown as symbols 8-13). Although the PTRS is shown as being allocated to all remaining symbols of the RB that are not allocated to DMRS symbols (e.g., symbols 3-6 and 8-13), in other implementations, the PTRS may be allocated only to a subset of the remaining symbols, such as, as non-limiting examples, every other symbol, every other symbol, every other symbol, every other symbol, or every other symbol. As shown in FIG. Figure 8 As shown, the PTRS may be assigned to a first set of symbols on a single subcarrier (shown as subcarrier 0) of a first subset of subcarriers, and a second set of symbols on a single subcarrier (shown as subcarrier 1) of a second subset of subcarriers. In other implementations, as non-limiting examples, the PTRS may be assigned to different subcarriers of a subset of subcarriers, or more than one subcarrier of each subset of subcarriers, such as each subcarrier, every other subcarrier, or every third subcarrier of a subset of subcarriers.

[0164] The PTRS allocated according to the alternative third configuration may be allocated to one or more symbols (shown as symbols 4-13) after the second DMRS symbol. Although the PTRS is shown as being allocated to all remaining symbols (e.g., symbols 4-13) of the RB after the DMRS symbol, in other implementations, the PTRS may be allocated to only a subset of the remaining symbols, such as every other symbol, every other symbol, every other symbol, every other symbol, or every other symbol, as non-limiting examples. Fig. 9 As shown, the PTRS may be assigned to a single subcarrier of a first subset of subcarriers, such as a first subcarrier (shown as subcarrier 0) of a first subset of subcarriers (e.g., even subcarriers). In other implementations, as non-limiting examples, the PTRS may be assigned to different subcarriers of the first subset of subcarriers, or more than one subcarrier of the first subset of subcarriers, such as each subcarrier, every other subcarrier, or every third subcarrier of the first subset of subcarriers.

[0165] In a third configuration, as shown by reference numeral 910, the DMRS port with the lowest index among the allocated DMRS ports is allocated to the second DMRS symbol, and the PTRS is aligned with the DMRS port with the lowest index. For example, the PTRS is aligned with port 1000, which has the lowest index of the first CDM group and the second CDM group. This may include or correspond to a PTRS associated with an antenna port (e.g., first antenna port 516) with the lowest index among multiple antenna ports (e.g., antenna port 514) at UE 115. Aligning the PTRS with the DMRS port with the lowest index may comply with one or more wireless communication standards, such as the 3GPP wireless communication standard.

[0166] In some embodiments, when the third configuration (or an alternative third configuration) is used, multiple DMRS ports can be combined into a single virtual port, as described elsewhere herein. In this way, denser DMRS coverage in the frequency domain can be achieved. In addition, multiple DMRS symbols using a traditional DMRS configuration can be assigned different DMRS ports. Multiple DMRS symbols can be continuous or non-continuous.

[0167] Fig.10 is a diagram illustrating a fourth example 1000 associated with DMRS and PTRS design for large subcarrier spacing in accordance with some aspects. Fig.10 PTRS allocations for both NZP PTRS (e.g., NZP PTRS ports) and ZP PTRS (e.g., ZP PTRS ports) are shown. Figure 5-6 As described, NZP PTRS is a PTRS transmitted with non-zero power so that the PTRS can be received by the target device, while ZP PTRS is a PTRS transmitted with zero power (or approximately zero power) and is not intended to be received by the target device, but is used to enable other PTRS transmitted to other devices to have reduced interference in the RB allocated to the ZP PTRS. For the first configuration with continuous DMRS symbols and the second configuration with non-continuous DMRS symbols, in Fig.10 , although the techniques described herein may be applied in a similar manner to any of the first configuration, the second configuration, the third configuration, or an alternate third configuration.

[0168] As shown in reference numeral 1005, the DMRS symbols allocated according to the first configuration may span two adjacent (e.g., consecutive) symbols. In this case, the first CDM group (at least CDM group 0 including DMRS port 1000) may occupy a first set or a first subset of subcarriers on the first symbol (shown as even subcarriers on symbol 2), and the second CDM group (at least CDM group 1 including DMRS port 1002) may occupy a second set or a second subset of subcarriers on the second symbol (shown as odd subcarriers on symbol 3).

[0169] As shown in reference numeral 1005, when DMRS symbols are assigned to consecutive symbols (shown as symbols 2 and 3), NZP PTRS may be assigned to a first subset of one or more symbols after the second DMRS symbol (shown as symbols 4-7 and 11-13), and ZP PTRS may be assigned to a second subset of one or more symbols after the second DMRS symbol (shown as symbols 8-10). In other implementations, the first subset of symbols and the second subset of symbols may include different symbols in one or more symbols (e.g., symbols 4-13). Fig.10 As shown, the NZP PTRS and ZP PTRS may be assigned to a single subcarrier of a first subset of subcarriers, such as a first subcarrier (shown as subcarrier 0) of a first subset of subcarriers (e.g., even subcarriers). In other implementations, the NZP PTRS and ZP PTRS may be assigned to different subcarriers of the first subset of subcarriers, or to more than one subcarrier of the first subset of subcarriers, such as, as non-limiting examples, every subcarrier, every other subcarrier, or every third subcarrier of the first subset of subcarriers. Although described with reference to the first configuration, similar NZP PTRS and ZP PTRS allocations may be made for the second configuration (having contiguous DMRS symbols), the third configuration, or an alternative third configuration, with allocations made across the second subset of subcarriers, if desired. In these implementations, the first subset of symbols and the second subset of symbols are fixed across corresponding subsets of subcarriers, as described with reference to Figure 7 and 9 Additionally or alternatively, the allocation of NZP PTRS and ZP PTRS may be associated with PDSCH, PUSCH, or PSSCH. For example, the allocation of NZP PTRS and ZP PTRS according to the first configuration may be associated with PDSCH, PUSCH, or PSSCH. As another example, the allocation of NZP PTRS and ZP PTRS according to the third configuration or an alternative third configuration may be associated only with PDSCH or PUSCH.

[0170] As shown in reference numeral 1010, the DMRS ports allocated according to the second configuration may span two non-adjacent (e.g., non-contiguous) symbols. In this case, a first CDM group (CDM group 0) may occupy a first set or a first subset of subcarriers on a first symbol (shown as even subcarriers on symbol 2), and a second CDM group (CDM group 1) may occupy a second set or a second subset of subcarriers on a second symbol (shown as odd subcarriers on symbol 7), wherein the first symbol and the second symbol are non-contiguous symbols.

[0171] When DMRS symbols are allocated to non-contiguous symbols, the NZP PTRS and ZP PTRS allocated according to the second configuration may be allocated to both the first set of symbols between the first DMRS symbol and the second DMRS symbol and the second set of symbols after the second DMRS symbol. As shown in reference numeral 1010, when DMRS symbols are allocated to non-contiguous symbols (shown as symbols 2 and 7), the NZP PTRS may be allocated to a first subset of the first set of symbols between the first DMRS symbol and the second DMRS symbol (shown as symbols 4 and 5) and a first subset of the second set of symbols after the second DMRS symbol (shown as symbols 10-12), and the ZP PTRS may be allocated to a second subset of the first set of symbols (shown as symbols 3 and 6) and a second subset of the second set of symbols (shown as symbols 8, 9, and 13). Although the NZP PTRS and the ZP PTRS are shown as being allocated to all remaining symbols (e.g., symbols 3-6 and 8-13) of the RB that are not allocated to DMRS symbols, in other implementations, the NZP PTRS and the ZP PTRS may be allocated only to a subset of the remaining symbols. like Fig.10 As shown, the NZP PTRS may be assigned to a first subset of a first set of symbols on a single subcarrier (shown as subcarrier 0) of a first subset of subcarriers, and a first subset of a second set of symbols on a single subcarrier (shown as subcarrier 1) of a second subset of subcarriers, and the ZP PTRS may be assigned to a second subset of the first set of symbols on a single subcarrier of the first set of subcarriers and a second subset of the second set of symbols on a single subcarrier of the second subset of subcarriers. In other implementations, the NZP PTRS and the ZP PTRS may be assigned to different subcarriers of a subset of subcarriers, or more than one subcarrier of each subset of subcarriers, such as each subcarrier, every other subcarrier, or every third subcarrier of a subset of subcarriers, as non-limiting examples.

[0172] Thus, when a staggered DMRS pattern is used, a staggered pattern of NZP PTRS and ZP PTRS may be used. The allocation of NZP PTRS and ZP PTRS according to the second configuration may be associated with PDSCH, PUSCH, or PSSCH. Additionally or alternatively, information associated with the staggered NZP PTRS and ZP PTRS allocation, such as an indication of ZP PTRS staggering, an offset associated with NZP PTRS or ZP PTRS, etc. may be communicated using DCI, UCI, or SCI-1 as a non-limiting example.

[0173] In some implementations, PTRS may be allocated to avoid RBs for DC tone. For example, PTRS may not be allocated to symbols including DC tone. In some implementations, NZP PTRS is not allocated to symbols including DC tone, but ZP PTRS may be allocated to symbols including DC tone, such as Fig.10 Additionally or alternatively, a PTRS (eg, NZP PTRS, ZP PTRS, or both) may not be allocated to a subcarrier including a DC tone.

[0174] refer to Fig.11 and 12 , a flowchart illustrating an example process performed by a UE is shown. Fig.11

[00106] An example process 1100 of UE operations for receiving a plurality of DMRSs and a PTRS aligned with at least one of the plurality of DMRSs is shown in accordance with some aspects. Fig.12 An example process 1200 of UE operation for transmitting multiple DMRS and a PTRS aligned with at least one of the multiple DMRSs according to some aspects is shown. In some implementations, process 1100 and / or process 1200 may be performed by UE 115 or a UE 115. Fig.13 1100 and / or 1200. In some other implementations, process 1100 and / or process 1200 may be performed by a device configured for wireless communication. For example, the device may include at least one processor and a memory coupled to the processor. The processor may be configured to perform the operations of process 1100 and / or process 1200. In some other embodiments, process 1100 and / or process 1200 may be performed or run using a non-transitory computer-readable medium having program code recorded thereon. The program code may be a program code executable by a computer for causing a computer to perform the operations of process 1100 and / or process 1200.

[0175] The example operations (also referred to as "boxes") of processes 1100 and 1200 will also be directed to Fig.13 The UE 1300 shown is described. Fig.131 is a block diagram illustrating an example UE 1300 configured to receive or transmit a plurality of DMRSs and a PTRS aligned with at least one of the plurality of DMRSs according to some aspects. The UE 1300 includes Figure 2 , 5 1 and 6. For example, the UE 1300 includes a controller / processor 280 for executing logic or computer instructions stored in a memory 282 and controlling the components of the UE 1300 that provide the features and functions of the UE 1300. Under the control of the controller / processor 280, the UE 1300 sends and receives signals via the wireless radios 1301a-r and the antennas 252a-r. The wireless radios 1301a-r include various components and hardware, such as Figure 2 As shown for UE 115, modulators / demodulators 254a-r, MIMO detector 256, receive processor 258, transmit processor 264, and TX MIMO processor 266 are included.

[0176] As shown, the memory 282 may include receiving logic 1302, channel estimation logic 1303, and transmitting logic 1304. The receiving logic 1302 may be configured to receive information or signaling, such as multiple DMRS and PTRS, from a transmitting node (e.g., a network entity or another UE). The channel estimation logic 1303 may be configured to determine a channel estimate based on the multiple DMRS and PTRS. The transmitting logic 1304 may be configured to be able to send signaling or messages, such as multiple DMRS and PTRS, to the transmitting node. The UE 1300 may receive signals from or send signals to one or more network entities or UEs, such as Figure 1-2 Base station 105, Figure 5 The sending node 550, Figure 6 A network entity 650, a core network, a core network device or a Fig.16 The network entities shown.

[0177] Back to reference Fig.11The process 1100 described, as shown in block 1102, UE 1300 receives a plurality of DMRS from a network entity or a second UE, including a first set of DMRS allocated to a first DMRS symbol and a first subset of subcarriers and a second set of DMRS allocated to a second DMRS symbol and a second subset of subcarriers. As an example of block 1102, UE 1300 may use wireless radio 1301a-r and antenna 252a-r and use receiving logic 1302 to receive the plurality of DMRS. For example, UE 1300 may execute receiving logic 1302 stored in memory 282 under the control of controller / processor 280. The execution environment of receiving logic 1302 provides the functionality of receiving a plurality of DMRS from a network entity or a second UE, the plurality of DMRS including a first set of DMRS allocated to a first DMRS symbol and a first subset of subcarriers and a second set of DMRS allocated to a second DMRS symbol and a second subset of subcarriers.

[0178] At block 1104, the UE 1300 receives a PTRS associated with a plurality of DMRSs from a network entity or a second UE. As an example of block 1104, the UE 1300 may use the wireless radio 1301a-r and the antenna 252a-r and receive the PTRS using the receiving logic 1302. For example, the UE 1300 may execute the receiving logic 1302 stored in the memory 282 under the control of the controller / processor 280. The execution environment of the receiving logic 1302 provides the functionality of receiving a PTRS associated with a plurality of DMRSs from a network entity or a second UE.

[0179] At block 1106, the UE 1300 performs channel and phase noise estimation based on the multiple DMRS and PTRS. For example, the UE 1300 may execute the channel estimation logic 1303 stored in the memory 282 under the control of the controller / processor 280. The execution environment of the channel estimation logic 1303 provides the functionality of performing channel and phase noise estimation based on the multiple DMRS and PTRS.

[0180] In some implementations, the first set of DMRS is associated with the first antenna port and the second set of DMRS is associated with the second antenna port. In some such implementations, the first antenna port may be included in a first CDM group configured for the UE 1300 and the second antenna port may be included in a second CDM group configured for the UE 1300. Additionally or alternatively, the process 1100 may further include combining the first antenna port and the second antenna port into a single virtual port. The single virtual port may be used to perform channel and phase noise estimation.

[0181] In some implementations, the first DMRS symbol and the second DMRS symbol are consecutive symbols. In some other implementations, the first DMRS symbol and the second DMRS symbol are non-consecutive symbols.

[0182] In some implementations, the PTRS may be assigned to one or more symbols after the first DMRS symbol and one or more subcarriers of the first subset of subcarriers. In some such implementations, the first set of DMRS may be associated with the antenna port having the lowest index among multiple antenna ports configured to receive DMRS at UE 1300. Additionally or alternatively, the one or more symbols after the first DMRS symbol may also be after the second DMRS symbol. Alternatively, the one or more symbols after the first DMRS symbol may include a first set of symbols between the first DMRS symbol and the second DMRS symbol and a second set of symbols after the second DMRS symbol. Additionally or alternatively, performing channel and phase noise estimation may include interpolating phases between resource elements of the first set of DMRS and the second set of DMRS. Additionally or alternatively, multiple DMRS and PTRS may be associated with a PDSCH between a UE and a network entity. Alternatively, multiple DMRS and PTRS may be associated with a PSSCH between a UE and a second UE.

[0183] In some implementations where the PTRS is assigned to one or more symbols following a first DMRS symbol and one or more subcarriers of a first subset of subcarriers, the PTRS may include an NZP PTRS assigned to the first subset of the one or more symbols and a ZP PTRS assigned to a second subset of the one or more symbols. In some such implementations, the first subset of the one or more symbols and the second subset of the one or more symbols may be fixed across the one or more subcarriers of the first subset of subcarriers. Additionally or alternatively, multiple DMRS and PTRS may be associated with a PDSCH between a UE and a network entity.

[0184] In some implementations where the PTRS is assigned to one or more symbols following a first DMRS symbol and one or more subcarriers of a first subset of subcarriers, the PTRS may include an NZP PTRS assigned to the first subset of the one or more symbols and a ZP PTRS assigned to a second subset of the one or more symbols, and the plurality of DMRSs and PTRSs may be associated with a PSSCH between a UE and a second UE. In some such implementations, the first subset of the one or more symbols and the second subset of the one or more symbols may be fixed across the one or more subcarriers of the first subset of subcarriers.

[0185] In some implementations, the PTRS may be optionally allocated to a first set of symbols between the first DMRS symbol and the second DMRS symbol and one or more subcarriers of the first subset of subcarriers, and may be allocated to a second set of symbols after the second DMRS symbol and one or more subcarriers of the second subset of subcarriers. In some such implementations, the PTRS is not allocated to the first set of symbols and one or more subcarriers of the first subset of subcarriers. In some other implementations, the PTRS is allocated to the first set of symbols and one or more subcarriers of the first subset of subcarriers. Additionally or alternatively, the process 1100 may further include receiving a first higher layer parameter associated with the first set of DMRS and a second higher layer parameter associated with the second set of DMRS from a network entity or a second UE. The first higher layer parameter may indicate an offset of the first set of symbols, and the second higher layer parameter may indicate an offset of the second set of symbols. Additionally or alternatively, the offset of the first set of symbols may be based on a first predetermined value stored in a memory of the UE 1300, and the offset of the second set of symbols may be based on a second predetermined value stored in the memory. In some such implementations, process 1100 also includes selecting a first predetermined value and a second predetermined value from a plurality of predetermined values ​​stored in a memory based on the configuration of the plurality of DMRS, one or more combs for communicating the plurality of DMRS, or both. Additionally or alternatively, the first set of symbols and the second set of symbols may not include one or more symbols assigned to a DC tone. Additionally or alternatively, the plurality of DMRS and PTRS may be associated with a PDSCH between UE 1300 and a network entity. In some other implementations, the plurality of DMRS and PTRS are associated with a PSSCH between UE 300 and a second UE.

[0186] In some implementations where the PTRS is optionally assigned to a first set of symbols between a first DMRS symbol and a second DMRS symbol and one or more subcarriers of a first subset of subcarriers, and to a second set of symbols after a second DMRS symbol and one or more subcarriers of a second subset of subcarriers, the PTRS may include an NZP PTRS assigned to a first subset of the first set of symbols and a first subset of the second set of symbols, and a ZP PTRS assigned to a second subset of the first set of symbols and a second subset of the second set of symbols. In some such implementations, the first subset of the first set of symbols and the second subset of the first set of symbols may be associated with one or more of the first subset of subcarriers, and the first subset of the second set of symbols and the second subset of the second set of symbols may be associated with the second subset of subcarriers. In some such implementations, the process 1100 also includes receiving a DCI from a network entity. The DCI may include a field indicating that the ZP PTRS is associated with multiple subsets of subcarriers. In some such implementations, the field includes a single bit. Additionally or alternatively, the DCI may indicate an offset of the second subset of the first set of symbols, an offset of the second subset of the second set of symbols, or both. As an alternative to receiving the DCI, the offset of the second subset of the first set of symbols, the offset of the second subset of the second set of symbols, or both may be based on one or more predefined values ​​stored in a memory of the UE 1300. Additionally or alternatively, multiple DMRS and PTRS may be associated with a PDSCH between the UE and a network entity.

[0187] In some implementations where the PTRS is optionally assigned to a first set of symbols between a first DMRS symbol and a second DMRS symbol and one or more subcarriers of a first subset of subcarriers, and to a second set of symbols after the second DMRS symbol and one or more subcarriers of a second subset of subcarriers, the PTRS may include an NZP PTRS assigned to a first subset of the first set of symbols and a first subset of the second set of symbols, and a ZP PTRS assigned to a second subset of the first set of symbols and a second subset of the second set of symbols. Multiple DMRS and PTRS may be associated with a PSSCH between UE1300 and a second UE. In some such implementations, a first subset of the first set of symbols and a second subset of the first set of symbols may be associated with one or more of the first subset of subcarriers, and a first subset of the second set of symbols and a second subset of the second set of symbols may be associated with a second subset of subcarriers. Additionally or alternatively, process 1100 may further include receiving an SCI-1 from a second UE. The SCI-1 may include a field indicating that the ZP PTRS is associated with multiple subsets of subcarriers. In some such implementations, the field includes a single bit. Additionally or alternatively, the SCI-1 may indicate an offset of a second subset of a first set of symbols, an offset of a second subset of a second set of symbols, or both. Instead of receiving the SCI-1, the process 1100 may further include receiving a DCI from a network entity. The DCI may include a field indicating that the ZPPTRS is associated with multiple subsets of subcarriers. In some such implementations, the field includes a single bit. Additionally or alternatively, the DCI may indicate an offset of a second subset of a first set of symbols, an offset of a second subset of a second set of symbols, or both. Instead of receiving the SCI-1 or the DCI, the offset of the second subset of the first set of symbols, the offset of the second subset of the second set of symbols, or both may be based on one or more predefined values ​​stored in a memory of the UE 1300.

[0188] In some implementations, the PTRS may be assigned to one or more symbols after the second DMRS symbol and one or more subcarriers of the second subset of subcarriers. In some such implementations, the first set of DMRS may be associated with an antenna port having a lower index than the antenna port associated with the second set of DMRS. Alternatively, the second set of DMRS may be associated with an antenna port having the lowest index of multiple antenna ports configured to receive DMRS at the UE. Additionally or alternatively, performing channel estimation may include interpolating phases between resource elements of the first set of DMRS and the second set of DMRS. Additionally or alternatively, multiple DMRS and PTRS may be associated with a PDSCH between UE1300 and a network entity. Additionally or alternatively, the PTRS may include an NZP PTRS assigned to a first subset of one or more symbols and a ZP PTRS assigned to a second subset of one or more symbols. In some such implementations, the first subset of one or more symbols and the second subset of one or more symbols may be fixed across one or more subcarriers of the second subset of subcarriers. Additionally or alternatively, multiple DMRSs and PTRSs may be associated with a PDSCH between the UE 1300 and a network entity.

[0189] Fig.12 A flow chart of process 1200 is shown. As shown in block 1202, UE 1300 transmits a plurality of DMRSs to a network entity, including a first set of DMRSs allocated to a first DMRS symbol and a first subset of subcarriers and a second set of DMRSs allocated to a second DMRS symbol and a second subset of subcarriers. As an example of block 1202, UE 1300 may transmit the plurality of DMRSs using wireless radios 1301a-r and antennas 252a-r and using transmit logic 1304. For example, UE 1300 may execute transmit logic 1304 stored in memory 282 under the control of controller / processor 280. The execution environment of transmit logic 1304 provides functionality for transmitting a plurality of DMRSs to a network entity, the plurality of DMRSs including a first set of DMRSs allocated to a first DMRS symbol and a first subset of subcarriers and a second set of DMRSs allocated to a second DMRS symbol and a second subset of subcarriers.

[0190] At block 1204, the UE 1300 transmits the PTRS associated with the plurality of DMRSs to a network entity. As an example of block 1204, the UE 1300 may transmit the PTRS using the wireless radios 1301a-r and the antennas 252a-r and using the transmit logic 1304. For example, the UE 1300 may execute the transmit logic 1304 stored in the memory 282 under the control of the controller / processor 280. The execution environment of the transmit logic 1304 provides functionality for transmitting the PTRS associated with the plurality of DMRSs to a network entity.

[0191] At block 1206, the UE 1300 receives a channel estimate from a network entity. The channel estimate may be based on a plurality of DMRS and PTRS. For illustration, the UE 1300 may receive the channel estimate using the wireless radio 1301a-r and antennas 252a-r and receive logic 1302. For further illustration, the UE 1300 may execute the receive logic 1302 stored in the memory 282 under the control of the controller / processor 280. The execution environment of the receive logic 1302 provides functionality for receiving a channel estimate from a network entity. The channel estimate may be based on a plurality of DMRS and PTRS.

[0192] In some implementations, multiple DMRS and PTRS are associated with a PUSCH between the UE 1300 and a network entity. Additionally or alternatively, a first set of DMRS may be associated with a first antenna port, and a second set of DMRS may be associated with a second antenna port. In some such implementations, the first antenna port may be included in a first CDM group configured for the UE 1300, and the second antenna port may be included in a second CDM group configured for the UE 1300.

[0193] In some implementations, the first DMRS symbol and the second DMRS symbol are consecutive symbols. In some other implementations, the first DMRS symbol and the second DMRS symbol are non-consecutive symbols.

[0194] In some implementations, process 1200 also includes assigning the PTRS to one or more symbols after the first DMRS symbol and one or more subcarriers of the first subset of subcarriers. In some such implementations, the one or more symbols after the first DMRS symbol may also be after the second DMRS symbol. Alternatively, the one or more symbols after the first DMRS symbol may include a first set of symbols between the first DMRS symbol and the second DMRS symbol and a second set of symbols after the second DMRS symbol.

[0195] In some implementations, the process 1200 also includes optionally allocating PTRS to a first set of symbols between the first DMRS symbol and the second DMRS symbol and one or more subcarriers of a first subset of subcarriers, and allocating PTRS to a second set of symbols after the second DMRS symbol and one or more subcarriers of a second subset of subcarriers. In some such implementations, the process 1200 also includes sending a first higher layer parameter associated with the first set of DMRS and a second higher layer parameter associated with the second set of DMRS to the network entity. The first higher layer parameter may indicate an offset of the first set of symbols, and wherein the second higher layer parameter may indicate an offset of the second set of symbols. Alternatively, the offset of the first set of symbols may be based on a first predetermined value stored in a memory of the UE, and the offset of the second set of symbols may be based on a second predetermined value stored in the memory. In some such implementations, the process 1200 also includes selecting a first predetermined value and a second predetermined value from a plurality of predetermined values ​​stored in the memory based on a configuration of a plurality of DMRSs, one or more combs for communicating a plurality of DMRSs, or both. Additionally or alternatively, the first set of symbols and the second set of symbols may not include one or more symbols allocated to a DC tone.

[0196] In some implementations, process 1200 also includes allocating the PTRS to one or more symbols following the second DMRS symbol and one or more subcarriers of the second subset of subcarriers. In some such implementations, the first set of DMRS may be associated with an antenna port having a lower index than an antenna port associated with the second set of DMRS. Alternatively, the second set of DMRS may be associated with an antenna port having a lowest index of a plurality of antenna ports configured to receive DMRS at UE 1300.

[0197] Figure 14-15 is a flow diagram illustrating an example process performed by a sending node, such as a network entity or a UE, in accordance with some aspects. Fig.14

[00106] An example process 1400 of transmitting node operations for transmitting a plurality of DMRSs and a PTRS aligned with at least one of the plurality of DMRSs is shown in accordance with some aspects. Fig.15 An example process 1500 of network entity operations for receiving a plurality of DMRSs and a PTRS aligned with at least one of the plurality of DMRSs according to some aspects is shown. In some implementations, any of the processes 1400-1500 may be performed by Figure 5 The sending node 550, Figure 6 The network entity 650 or as referenced Fig.16The sending node described in the present invention may be executed by a transmitting node. In some other implementations, any one of the processes 1400-1500 may be executed by a device configured for wireless communication. For example, the device may include at least one processor and a memory coupled to the processor. The processor may be configured to perform the operation of any one of the processes 1400-1500. In some other embodiments, a non-transitory computer-readable medium having a program code recorded thereon may be used to perform or run any one of the processes 1400-1500. The program code may be a program code executable by a computer for causing the computer to perform the operation of any one of the processes 1400-1500.

[0198] It will also target Fig.16 The sending node 1600 is shown to describe example blocks of processes 1400 - 1500 . Fig.16 1 is a block diagram illustrating an example of a transmitting node 1600 configured to transmit or receive a plurality of DMRSs and a PTRS aligned with at least one of the plurality of DMRSs according to some aspects. As an illustrative, non-limiting example, the transmitting node 1600 may include Figure 1-2 Base station 105, Figure 5 The sending node 550, Figure 6 The sending node 1600 includes a network entity 650, a network or a core network. Figure 1 and 2 Base station 105, Figure 5 The sending node 550, Figure 6 The structure, hardware, and components shown in the network entity 650 or a combination thereof. For example, the sending node 1600 may include a controller / processor 240, which is used to execute logic or computer instructions stored in the memory 242 and control the components of the sending node 1600 that provide the features and functions of the sending node 1600. The sending node 1600 sends and receives signals via the wireless radio device 1601a-t and the antenna 234a-t under the control of the controller / processor 240. The wireless radio device 1601a-t includes various components and hardware, such as Figure 2 As shown in FIG. 5 , a transmitting node 550 or a network entity 650 (eg, a base station 105 ) includes modulators / demodulators 232 a - t , a transmit processor 220 , a TX MIMO processor 230 , a MIMO detector 236 , and a receive processor 238 .

[0199] As shown, the memory 242 may include a transmission logic 1602, a reception logic 1603, and a channel estimation logic 1604. The transmission logic 1602 may be configured to initiate the transmission of information or signals, such as multiple DMRS and PTRS, to a UE. The reception logic 1603 may be configured to receive information or signals, such as multiple DMRS and PTRS, from a UE. The channel estimation logic 1604 may be configured to determine a channel estimate based on the multiple DMRS and PTRS. The transmitting node 1600 may receive information or signals, such as multiple DMRS and PTRS, from one or more UEs (e.g., Figure 1-2 , 5 and 6 UE 115 or Fig.13 UE 1300) receives signals or sends signals to it.

[0200] Back to reference Fig.14 The process 1400 described, as shown in block 1402, the transmitting node 1600 transmits a plurality of DMRS to the UE, including a first set of DMRS allocated to a first DMRS symbol and a first subset of subcarriers and a second set of DMRS allocated to a second DMRS symbol and a second subset of subcarriers. For illustration, the transmitting node 1600 may transmit the plurality of DMRS using the wireless radio 1601a-t and the antenna 234a-t and the transmitting logic 1602. For further illustration, the transmitting node 1600 may execute the transmitting logic 1602 stored in the memory 242 under the control of the controller / processor 240. The execution environment of the transmitting logic 1602 provides the functionality of transmitting the plurality of DMRS to the UE, the plurality of DMRS including a first set of DMRS allocated to a first DMRS symbol and a first subset of subcarriers and a second set of DMRS allocated to a second DMRS symbol and a second subset of subcarriers.

[0201] At block 1404, the transmitting node 1600 transmits the PTRS associated with the plurality of DMRSs to the UE. For illustration, the transmitting node 1600 may transmit the PTRS using the wireless radios 1601a-t and the antennas 234a-t and the transmitting logic 1602. For further illustration, the transmitting node 1600 may execute the transmitting logic 1602 stored in the memory 242 under the control of the controller / processor 240. The execution environment of the transmitting logic 1602 provides the functionality of transmitting the PTRS associated with the plurality of DMRSs to the UE.

[0202] At block 1406, the transmitting node 1600 receives a channel estimate from the UE. The channel estimate may be based on a plurality of DMRS and PTRS. For illustration, the transmitting node 1600 may receive the channel estimate using the wireless radio 1601a-t and the antenna 234a-t and the receiving logic 1603. For further illustration, the transmitting node 1600 may execute the receiving logic 1603 stored in the memory 242 under the control of the controller / processor 240. The execution environment of the receiving logic 1603 provides the functionality of receiving the channel estimate from the UE. The channel estimate may be based on a plurality of DMRS and PTRS.

[0203] In some implementations, the first set of DMRS is associated with a first antenna port and the second set of DMRS is associated with a second antenna port. In some such implementations, the first antenna port may be included in a first CDM group configured for the UE and the second antenna port may be included in a second CDM group configured for the UE. Additionally or alternatively, process 1400 may further include sending an indication to the UE. The indication may be to combine the first antenna port and the second antenna port into a single virtual port for performing channel estimation.

[0204] In some implementations, the first DMRS symbol and the second DMRS symbol are consecutive symbols. In some other implementations, the first DMRS symbol and the second DMRS symbol are non-consecutive symbols.

[0205] In some implementations, process 1400 also includes assigning a PTRS to one or more symbols after the first DMRS symbol and one or more subcarriers of a first subset of subcarriers. In some such implementations, the first set of DMRS may be associated with an antenna port having a lowest index of multiple antenna ports configured to receive DMRS at the UE. Additionally or alternatively, the one or more symbols after the first DMRS symbol may also be after the second DMRS symbol. Alternatively, the one or more symbols after the first DMRS symbol may include a first set of symbols between the first DMRS symbol and the second DMRS symbol and a second set of symbols after the second DMRS symbol. Additionally or alternatively, the transmitting node 1600 may include a network entity, and the plurality of DMRS and PTRS may be associated with a PDSCH between the network entity and the UE. Alternatively, the transmitting node 1600 may include a second UE, and the plurality of DMRS and PTRS may be associated with a PSSCH between the second UE and the UE.

[0206] In some implementations where process 1400 further includes assigning a PTRS to one or more symbols following a first DMRS symbol and to one or more subcarriers of a first subset of subcarriers, the PTRS may include an NZP PTRS assigned to the first subset of the one or more symbols and a ZP PTRS assigned to a second subset of the one or more symbols. In some such implementations, the first subset of the one or more symbols and the second subset of the one or more symbols may be fixed across the one or more subcarriers of the first subset of subcarriers. Additionally or alternatively, transmitting node 1600 may include a network entity, and the plurality of DMRSs and PTRSs may be associated with a PDSCH between the network entity and the UE.

[0207] In some implementations where process 1400 further includes allocating a PTRS to one or more symbols following the first DMRS symbol and to one or more subcarriers of a first subset of subcarriers, transmitting node 1600 may include a second UE, the PTRS may include an NZP PTRS allocated to the first subset of the one or more symbols and a ZP PTRS allocated to a second subset of the one or more symbols, and the plurality of DMRSs and PTRSs may be associated with a PSSCH between the second UE and the UE. In some such implementations, the first subset of the one or more symbols and the second subset of the one or more symbols may be fixed across the one or more subcarriers of the first subset of subcarriers.

[0208] In some implementations, the process 1400 also includes optionally allocating PTRS to a first set of symbols between the first DMRS symbol and the second DMRS symbol and one or more subcarriers of the first subset of subcarriers, and allocating PTRS to a second set of symbols after the second DMRS symbol and one or more subcarriers of the second subset of subcarriers. In some such implementations, PTRS may not be allocated to the first set of symbols and one or more subcarriers of the first subset of subcarriers. Alternatively, PTRS may be allocated to the first set of symbols and one or more subcarriers of the first subset of subcarriers. Additionally or alternatively, the process 1400 may also include sending a first higher layer parameter associated with the first set of DMRS and a second higher layer parameter associated with the second set of DMRS to the UE. The first higher layer parameter may indicate an offset of the first set of symbols, and the second higher layer parameter may indicate an offset of the second set of symbols. Alternatively, the offset of the first set of symbols may be based on a first predetermined value stored in a memory of the transmitting node 1600, and the offset of the second set of symbols may be based on a second predetermined value stored in the memory. In some such implementations, the memory may be configured to store a plurality of predetermined values ​​corresponding to one or more configurations of a plurality of DMRS, one or more combs for communicating a plurality of DMRS, or both. Additionally or alternatively, the first set of symbols and the second set of symbols may not include one or more symbols assigned to a DC tone. Additionally or alternatively, the transmitting node 1600 may include a network entity, and the plurality of DMRS and PTRS may be associated with a PDSCH between the network entity and the UE. Alternatively, the transmitting node 1600 may include a second UE, and the plurality of DMRS and PTRS may be associated with a PSSCH between the second UE and the UE.

[0209] In some implementations, the process 1400 also includes optionally assigning a PTRS to a first set of symbols between the first DMRS symbol and the second DMRS symbol and one or more subcarriers of a first subset of subcarriers, and assigning a PTRS to a second set of symbols after the second DMRS symbol and one or more subcarriers of a second subset of subcarriers, the PTRS may include an NZP PTRS assigned to a first subset of the first set of symbols and a first subset of the second set of symbols, and a ZP PTRS assigned to a second subset of the first set of symbols and a second subset of the second set of symbols. In some such implementations, the first subset of the first set of symbols and the second subset of the first set of symbols may be associated with one or more of the first subset of subcarriers, and the first subset of the second set of symbols and the second subset of the second set of symbols may be associated with the second subset of subcarriers. Additionally or alternatively, the process 1400 may also include sending a DCI to the UE. The DCI may include a field indicating that the ZP PTRS is associated with multiple subsets of subcarriers, and the sending node 1600 may include a network entity. In some such implementations, the field may include a single bit. Additionally or alternatively, the DCI may indicate an offset for the second subset of the first set of symbols, an offset for the second subset of the second set of symbols, or both. Instead of receiving the DCI, the offset for the second subset of the first set of symbols, the offset for the second subset of the second set of symbols, or both may be based on one or more predefined values ​​stored in a memory of the transmitting node. Additionally or alternatively, multiple DMRS and PTRS may be associated with a PDSCH between a network entity and a UE.

[0210] In some implementations, the process 1400 also includes optionally allocating PTRS to a first set of symbols between the first DMRS symbol and the second DMRS symbol and one or more subcarriers of the first subset of subcarriers, and allocating PTRS to a second set of symbols after the second DMRS symbol and one or more subcarriers of the second subset of subcarriers, the transmitting node 1600 may include a second UE, the PTRS may include NZP PTRS allocated to a first subset of the first set of symbols and a first subset of the second set of symbols and ZP PTRS allocated to a second subset of the first set of symbols and a second subset of the second set of symbols, and the plurality of DMRS and PTRS may be associated with a PSSCH between the second UE and the UE. In some such implementations, the first subset of the first set of symbols and the second subset of the first set of symbols may be associated with one or more of the first subset of subcarriers, and the first subset of the second set of symbols and the second subset of the second set of symbols may be associated with the second subset of subcarriers. Additionally or alternatively, the process 1400 may also include sending SCI-1 to the UE. The SCI-1 may include a field indicating that the ZP PTRS is associated with a plurality of subsets of subcarriers. In some such implementations, the field may comprise a single bit. Additionally or alternatively, the SCI-1 may indicate an offset for the second subset of the first set of symbols, an offset for the second subset of the second set of symbols, or both. Instead of receiving the SCI-1, the offset for the second subset of the first set of symbols, the offset for the second subset of the second set of symbols, or both may be based on one or more predefined values ​​stored in a memory of the sending node.

[0211] In some implementations, process 1400 also includes optionally allocating PTRS to a first set of symbols between the first DMRS symbol and the second DMRS symbol and one or more subcarriers of a first subset of subcarriers, and allocating PTRS to a second set of symbols after the second DMRS symbol and one or more subcarriers of a second subset of subcarriers, the transmitting node 1600 may include a network entity, and process 1400 may also include sending DCI to the UE. The DCI may indicate that the ZP PTRS is associated with multiple subsets of subcarriers. In some such implementations, the DCI may indicate an offset of the ZP PTRS.

[0212] In some implementations, the process 1400 also includes assigning a PTRS to one or more symbols after the second DMRS symbol and one or more subcarriers of a second subset of subcarriers. In some such implementations, the first set of DMRS may be associated with an antenna port having a lower index than the antenna port associated with the second set of DMRS. Alternatively, the second set of DMRS may be associated with an antenna port having the lowest index of multiple antenna ports configured to receive DMRS at the UE. Additionally or alternatively, the transmitting node 1600 may include a network entity, and the plurality of DMRS and PTRS may be associated with a PDSCH between the network entity and the UE. Additionally or alternatively, the PTRS may include an NZP PTRS assigned to a first subset of one or more symbols and a ZP PTRS assigned to a second subset of one or more symbols. In some such implementations, the first subset of one or more symbols and the second subset of one or more symbols may be fixed across one or more subcarriers of a second subset of subcarriers. Additionally or alternatively, the transmitting node 1600 may include a network entity, and the plurality of DMRS and PTRS may be associated with a PDSCH between the network entity and the UE.

[0213] Fig.15 A flow chart of process 1500 is shown. As shown in box 1502, a transmitting node 1600 receives a plurality of DMRS from a UE, including a first set of DMRS allocated to a first DMRS symbol and a first subset of subcarriers, and a second set of DMRS allocated to a second DMRS symbol and a second subset of subcarriers. For illustration, the transmitting node 1600 may receive the plurality of DMRS using a wireless radio 1601a-t and antennas 234a-t. For further illustration, the transmitting node 1600 may execute receiving logic 1603 stored in memory 242 under the control of the controller / processor 240. The execution environment of the receiving logic 1603 provides functionality for receiving a plurality of DMRS from a UE, the plurality of DMRS including a first set of DMRS allocated to a first DMRS symbol and a first subset of subcarriers and a second set of DMRS allocated to a second DMRS symbol and a second subset of subcarriers.

[0214] At block 1504, the transmitting node 1600 receives a PTRS associated with a plurality of DMRSs from the UE. For illustration, the transmitting node 1600 may receive the PTRS using the radios 1601a-t and the antennas 234a-t. For further illustration, the transmitting node 1600 may execute the receiving logic 1603 stored in the memory 242 under the control of the controller / processor 240. The execution environment of the receiving logic 1603 provides the functionality of receiving a PTRS associated with a plurality of DMRSs from the UE.

[0215] At block 1506, the transmitting node 1600 performs channel estimation based on the plurality of DMRSs and performs a phase tracking process based on the plurality of DMRSs and PTRSs. As an example of block 1506, the transmitting node 1600 may execute channel estimation logic 1604 stored in the memory 242 under the control of the controller / processor 240. The execution environment of the channel estimation logic 1604 provides the functionality of performing channel estimation based on the plurality of DMRSs and performing a phase tracking process based on the plurality of DMRSs and PTRSs.

[0216] In some implementations, a plurality of DMRS and PTRS are associated with a PUSCH between a network entity and a UE. Additionally or alternatively, a first set of DMRS may be associated with a first antenna port, and a second set of DMRS may be associated with a second antenna port. In some such implementations, the first antenna port may be included in a first CDM group configured for the UE, and the second antenna port may be included in a second CDM group configured for the UE.

[0217] In some implementations, the first DMRS symbol and the second DMRS symbol are consecutive symbols. In some other implementations, the first DMRS symbol and the second DMRS symbol are non-consecutive symbols.

[0218] In some implementations, the PTRS is assigned to one or more symbols after the first DMRS symbol and one or more subcarriers of the first subset of subcarriers. In some such implementations, the one or more symbols after the first DMRS symbol may also be after the second DMRS symbol. Alternatively, the one or more symbols after the first DMRS symbol may include a first set of symbols between the first DMRS symbol and the second DMRS symbol and a second set of symbols after the second DMRS symbol.

[0219] In some implementations, the PTRS may optionally be allocated to a first set of symbols between a first DMRS symbol and a second DMRS symbol and one or more subcarriers of a first subset of subcarriers, and may be allocated to a second set of symbols after the second DMRS symbol and one or more subcarriers of a second subset of subcarriers. In some such implementations, process 1500 may also include receiving a first higher layer parameter associated with the first set of DMRS and a second higher layer parameter associated with the second set of DMRS from the UE. The first higher layer parameter may indicate an offset of the first set of symbols, and the second higher layer parameter may indicate an offset of the second set of symbols. Alternatively, the offset of the first set of symbols may be based on a first predetermined value stored in a memory of the UE, and the offset of the second set of symbols may be based on a second predetermined value stored in the memory. Additionally or alternatively, the first set of symbols and the second set of symbols may not include one or more symbols allocated to the DC tone.

[0220] In some implementations, the PTRS is allocated to one or more symbols after the second DMRS symbol and one or more subcarriers of the second subset of subcarriers. In some such implementations, the first set of DMRS may be associated with an antenna port having a lower index than an antenna port associated with the second set of DMRS. Alternatively, the second set of DMRS may be associated with an antenna port having a lowest index of a plurality of antenna ports configured to receive DMRS at the UE.

[0221] Note, reference Fig.11 , 12 , 14 and 15 may be combined with one or more blocks (or operations) of another figure. Fig.11 One or more boxes (or operations) of Fig.12 As another example, Fig.11 , 12 , 14 or 15 may be combined with one or more of the blocks Figure 2 , 5 or another combination of one or more blocks (or operations) of 6. Additionally or alternatively, the above reference Figure 1-15 One or more of the operations described may be combined with reference to Fig.16 Describes a combination of one or more operations.

[0222] In some aspects, the technology for implementing the alignment of PTRS with DMRS assigned to different symbols may include additional aspects, such as any single aspect or any combination of multiple aspects described below and / or in combination with one or more other processes or devices described elsewhere herein. In some aspects, implementing the alignment of PTRS with DMRS assigned to different symbols may include a device receiving multiple DMRSs from a network entity or a second UE, the multiple DMRSs including a first set of DMRSs assigned to a first DMRS symbol and a first subset of subcarriers and a second set of DMRSs assigned to a second DMRS symbol and a second subset of subcarriers. The device may also receive a PTRS associated with the multiple DMRSs from the network entity or the second UE. The device may also perform channel and phase noise estimation based on the multiple DMRSs and PTRSs. In some implementations, the device includes a wireless device, such as a UE. In some implementations, the device may include at least one processor and a memory coupled to the processor. The processor may be configured to perform the operations described herein for the wireless device. In some other implementations, the device may include a non-transitory computer-readable medium having a program code recorded thereon, and the program code may be executed by a computer for causing the computer to perform the operations described herein with reference to the wireless device. In some implementations, the apparatus may include one or more components configured to perform the operations described herein.

[0223] In a first aspect, a first set of DMRS is associated with a first antenna port and a second set of DMRS is associated with a second antenna port.

[0224] In a second aspect, in combination with the first aspect, the first antenna port is included in a first CDM group configured for the apparatus, and the second antenna port is included in a second CDM group configured for the apparatus.

[0225] In a third aspect, alone or in combination with one or more of the first to second aspects, the apparatus combines the first antenna port and the second antenna port into a single virtual port. The single virtual port is used to perform channel and phase noise estimation.

[0226] In a fourth aspect, alone or in combination with one or more of the first to third aspects, the first DMRS symbol and the second DMRS symbol are consecutive symbols.

[0227] In a fifth aspect, alone or in combination with one or more of the first to third aspects, the first DMRS symbol and the second DMRS symbol are non-contiguous symbols.

[0228] In a sixth aspect, alone or in combination with one or more of the first to fifth aspects, a PTRS is allocated to one or more symbols following a first DMRS symbol and one or more subcarriers of a first subset of subcarriers.

[0229] In a seventh aspect, in combination with the sixth aspect, the first set of DMRS is associated with an antenna port having a lowest index of a plurality of antenna ports configured to receive DMRS at the apparatus.

[0230] In an eighth aspect, alone or in combination with one or more of the sixth to seventh aspects, one or more symbols after the first DMRS symbol are also after the second DMRS symbol.

[0231] In the ninth aspect, alone or in combination with one or more of the sixth to seventh aspects, the one or more symbols after the first DMRS symbol include a first set of symbols between the first DMRS symbol and the second DMRS symbol and a second set of symbols after the second DMRS symbol.

[0232] In a tenth aspect, alone or in combination with one or more of the sixth to ninth aspects, performing channel and phase noise estimation includes interpolating phase between resource elements of the first set of DMRS and the second set of DMRS.

[0233] In an eleventh aspect, alone or in combination with one or more of the sixth to tenth aspects, a plurality of DMRSs and PTRSs are associated with a PDSCH between a device and a network entity.

[0234] In a twelfth aspect, alone or in combination with one or more of the sixth to tenth aspects, a plurality of DMRSs and PTRSs are associated with a PSSCH between the apparatus and a second UE.

[0235] In a thirteenth aspect, alone or in combination with one or more of the sixth to twelfth aspects, the PTRS comprises an NZP PTRS allocated to a first subset of one or more symbols and a ZP PTRS allocated to a second subset of one or more symbols.

[0236] In a fourteenth aspect, in combination with the thirteenth aspect, the first subset of one or more symbols and the second subset of one or more symbols are fixed across one or more subcarriers of the first subset of subcarriers.

[0237] In a fifteenth aspect, alone or in combination with one or more of the thirteenth to fourteenth aspects, a plurality of DMRS and PTRS are associated with a PDSCH between an apparatus and a network entity.

[0238] In the sixteenth aspect, alone or in combination with one or more of the sixth to twelfth aspects, the PTRS includes an NZP PTRS allocated to a first subset of one or more symbols and a ZP PTRS allocated to a second subset of one or more symbols, and the multiple DMRS and PTRS are associated with a PSSCH between the device and a second UE.

[0239] In a seventeenth aspect, in combination with the sixteenth aspect, the first subset of one or more symbols and the second subset of one or more symbols are fixed across one or more subcarriers of the first subset of subcarriers.

[0240] In the eighteenth aspect, alone or in combination with one or more of the first to fifth aspects, the PTRS is optionally allocated to a first set of symbols between the first DMRS symbol and the second DMRS symbol and one or more subcarriers of a first subset of subcarriers, and allocated to a second set of symbols after the second DMRS symbol and one or more subcarriers of a second subset of subcarriers.

[0241] In a nineteenth aspect, in combination with the eighteenth aspect, the PTRS is not allocated to the first set of symbols and one or more subcarriers of the first subset of subcarriers.

[0242] In the twentieth aspect, in combination with the eighteenth aspect, the PTRS is allocated to a first set of symbols and one or more subcarriers of a first subset of subcarriers.

[0243] In a twenty-first aspect, alone or in combination with one or more of aspects 18 to 20, an apparatus receives a first higher layer parameter associated with a first set of DMRS and a second higher layer parameter associated with a second set of DMRS from a network entity or a second UE. The first higher layer parameter indicates an offset of the first set of symbols, and the second higher layer parameter indicates an offset of the second set of symbols.

[0244] In aspect twenty-second, alone or in combination with one or more of aspects eighteen to twentieth, the offset of the first set of symbols is based on a first predetermined value stored in a memory of the device, and the offset of the second set of symbols is based on a second predetermined value stored in the memory.

[0245] In the twenty-third aspect, in combination with the twenty-second aspect, the device selects a first predetermined value and a second predetermined value from a plurality of predetermined values ​​stored in a memory based on the configuration of the plurality of DMRSs, one or more combs for communicating the plurality of DMRSs, or both.

[0246] In a twenty-fourth aspect, either alone or in combination with one or more of the eighteenth to twenty-third aspects, the first set of symbols and the second set of symbols exclude one or more symbols assigned to a DC tone.

[0247] In a twenty-fifth aspect, alone or in combination with one or more of the eighteenth to twenty-fourth aspects, a plurality of DMRS and PTRS are associated with a PDSCH between a device and a network entity.

[0248] In a twenty-sixth aspect, alone or in combination with one or more of the eighteenth to twenty-fourth aspects, a plurality of DMRSs and PTRSs are associated with a PSSCH between the device and a second UE.

[0249] In the twenty-seventh aspect, either alone or in combination with one or more of aspects eighteen to twenty-six, the PTRS comprises an NZP PTRS assigned to a first subset of the first set of symbols and a first subset of the second set of symbols, and a ZP PTRS assigned to a second subset of the first set of symbols and a second subset of the second set of symbols.

[0250] In aspect twenty-eight, in combination with aspect twenty-seven, a first subset of the first set of symbols and a second subset of the first set of symbols are associated with one or more of the first subset of subcarriers, and a first subset of the second set of symbols and a second subset of the second set of symbols are associated with a second subset of subcarriers.

[0251] In a twenty-ninth aspect, in combination with the twenty-eighth aspect, an apparatus receives DCI from a network entity. The DCI includes a field indicating that a ZPPTRS is associated with a plurality of subsets of subcarriers.

[0252] In the thirtieth aspect, in combination with the twenty-ninth aspect, the field comprises a single bit.

[0253] In the thirty-first aspect, alone or in combination with one or more of the twenty-ninth to thirtieth aspects, the DCI indicates an offset of a second subset of the first set of symbols, an offset of a second subset of the second set of symbols, or both.

[0254] In a thirty-second aspect, in combination with the twenty-eighth aspect, the offset of the second subset of the first set of symbols, the offset of the second subset of the second set of symbols, or both are based on one or more predefined values ​​stored in a memory of the device.

[0255] In a thirty-third aspect, alone or in combination with one or more of aspects twenty-eight to thirty-second, a plurality of DMRS and PTRS are associated with a PDSCH between an apparatus and a network entity.

[0256] In a thirty-fourth aspect, alone or in combination with one or more of aspects 18 to 26, the PTRS includes an NZP PTRS allocated to a first subset of the first set of symbols and a first subset of the second set of symbols, and a ZP PTRS allocated to a second subset of the first set of symbols and a second subset of the second set of symbols. The multiple DMRS and PTRS are associated with a PSSCH between the device and a second UE.

[0257] In aspect thirty-fifth, in combination with aspect thirty-fourth, a first subset of the first set of symbols and a second subset of the first set of symbols are associated with one or more of a first subset of subcarriers, and a first subset of the second set of symbols and a second subset of the second set of symbols are associated with a second subset of subcarriers.

[0258] In a thirty-sixth aspect, alone or in combination with one or more of the thirty-fourth to thirty-fifth aspects, the apparatus receives an SCI-1 from a second UE. The SCI-1 includes a field indicating that the ZP PTRS is associated with a plurality of subsets of subcarriers.

[0259] In the thirty-seventh aspect, in combination with the thirty-sixth aspect, the field comprises a single bit.

[0260] In aspect thirty-eight, either alone or in combination with one or more of aspects thirty-six to thirty-seven, the SCI-1 indicates an offset of a second subset of a first set of symbols, an offset of a second subset of a second set of symbols, or both.

[0261] In a thirty-ninth aspect, alone or in combination with one or more of aspects thirty-four to thirty-fifth, an apparatus receives a DCI from a network entity. The DCI includes a field indicating that a ZP PTRS is associated with a plurality of subsets of subcarriers.

[0262] In the fortieth aspect, in combination with the thirty-ninth aspect, the field comprises a single bit.

[0263] In the forty-first aspect, either alone or in combination with one or more of the thirty-ninth to fortieth aspects, the DCI indicates an offset of a second subset of a first set of symbols, an offset of a second subset of a second set of symbols, or both.

[0264] In aspect 42, either alone or in combination with one or more of aspects 34 to 35, the offset of the second subset of the first set of symbols, the offset of the second subset of the second set of symbols, or both are based on one or more predefined values ​​stored in a memory of the device.

[0265] In a 43rd aspect, alone or in combination with one or more of the first to fifth aspects, the PTRS is allocated to one or more symbols following the second DMRS symbol and one or more subcarriers of the second subset of subcarriers.

[0266] In a forty-fourth aspect, in combination with the forty-third aspect, the first set of DMRS is associated with antenna ports having a lower index than the antenna ports associated with the second set of DMRS.

[0267] In a forty-fifth aspect, in combination with the forty-third aspect, the second set of DMRS is associated with an antenna port having a lowest index of a plurality of antenna ports configured to receive the DMRS at the device.

[0268] In a 46th aspect, alone or in combination with one or more of aspects 43 to 45, performing channel estimation includes interpolating phases between resource elements of a first set of DMRS and a second set of DMRS.

[0269] In a 47th aspect, alone or in combination with one or more of the 43rd to 46th aspects, multiple DMRS and PTRS are associated with a PDSCH between a device and a network entity.

[0270] In a 48th aspect, either alone or in combination with one or more of aspects 43 to 47, the PTRS comprises an NZP PTRS allocated to a first subset of one or more symbols and a ZP PTRS allocated to a second subset of one or more symbols.

[0271] In a forty-ninth aspect, in combination with the forty-eighth aspect, the first subset of one or more symbols and the second subset of one or more symbols are fixed across one or more subcarriers of the second subset of subcarriers.

[0272] In a fiftieth aspect, alone or in combination with one or more of the forty-eighth to forty-ninth aspects, multiple DMRS and PTRS are associated with a PDSCH between a device and a network entity.

[0273] In some aspects, a device configured for wireless communication (such as a UE) is configured to send multiple DMRS to a network entity, the multiple DMRS including a first set of DMRSs assigned to a first DMRS symbol and a first subset of subcarriers and a second set of DMRSs assigned to a second DMRS symbol and a second subset of subcarriers. The device is also configured to send a PTRS associated with the multiple DMRSs to the network entity. The device is also configured to receive a channel estimate from the network entity. The channel estimate is based on the multiple DMRSs and the PTRS. In some implementations, the device includes a wireless device, such as a UE. In some implementations, the device may include at least one processor and a memory coupled to the processor. The processor may be configured to perform the operations described herein for the wireless device. In some other implementations, the device may include a non-transitory computer-readable medium having a program code recorded thereon, and the program code may be executed by a computer to cause the computer to perform the operations described herein with reference to the wireless device. In some implementations, the device may include one or more components configured to perform the operations described herein.

[0274] In a fifty-first aspect, multiple DMRS and PTRS are associated with a PUSCH between a device and a network entity.

[0275] In a fifty-second aspect, alone or in combination with the fifty-first aspect, a first set of DMRS is associated with a first antenna port, and wherein a second set of DMRS is associated with a second antenna port.

[0276] In a fifty-third aspect, in combination with the fifty-second aspect, the first antenna port is included in a first CDM group configured for the apparatus, and wherein the second antenna port is included in a second CDM group configured for the apparatus.

[0277] In a fifty-fourth aspect, alone or in combination with one or more of the fifty-first to fifty-third aspects, the first DMRS symbol and the second DMRS symbol are consecutive symbols.

[0278] In the fifty-fifth aspect, alone or in combination with one or more of the fifty-first to fifty-third aspects, the first DMRS symbol and the second DMRS symbol are non-contiguous symbols.

[0279] In aspect fifty-six, alone or in combination with one or more of aspects fifty-one to fifty-five, the apparatus allocates a PTRS to one or more symbols following a first DMRS symbol and to one or more subcarriers of a first subset of subcarriers.

[0280] In the fifty-seventh aspect, in combination with the fifty-sixth aspect, one or more symbols after the first DMRS symbol are also after the second DMRS symbol.

[0281] In the fifty-eighth aspect, in combination with the fifty-sixth aspect, the one or more symbols after the first DMRS symbol include a first set of symbols between the first DMRS symbol and the second DMRS symbol and a second set of symbols after the second DMRS symbol.

[0282] In aspect fifty-ninth, alone or in combination with one or more of aspects fifty-first to fifty-fifth, the apparatus optionally allocates PTRS to a first set of symbols between a first DMRS symbol and a second DMRS symbol and one or more subcarriers of a first subset of subcarriers, and allocates PTRS to a second set of symbols after a second DMRS symbol and one or more subcarriers of a second subset of subcarriers.

[0283] In a sixtieth aspect, in combination with the fifty-ninth aspect, the apparatus sends a first higher layer parameter associated with a first set of DMRS and a second higher layer parameter associated with a second set of DMRS to a network entity. The first higher layer parameter indicates an offset of the first set of symbols, and the second higher layer parameter indicates an offset of the second set of symbols.

[0284] In the sixty-first aspect, in combination with the fifty-ninth aspect, the offset of the first set of symbols is based on a first predetermined value stored in a memory of the device, and the offset of the second set of symbols is based on a second predetermined value stored in the memory.

[0285] In the sixty-second aspect, in combination with the sixty-first aspect, the device selects a first predetermined value and a second predetermined value from a plurality of predetermined values ​​stored in a memory based on the configuration of a plurality of DMRSs, one or more combs for communicating the plurality of DMRSs, or both.

[0286] In a sixty-third aspect, either alone or in combination with one or more of aspects fifty-nine to sixty-second, the first set of symbols and the second set of symbols exclude one or more symbols assigned to a DC tone.

[0287] In aspect sixty-four, alone or in combination with one or more of aspects fifty-one to fifty, the apparatus allocates PTRS to one or more symbols following a second DMRS symbol and to one or more subcarriers of a second subset of subcarriers.

[0288] In a sixty-fifth aspect, in combination with the sixty-fourth aspect, the first set of DMRS is associated with antenna ports having a lower index than the antenna ports associated with the second set of DMRS.

[0289] In a sixty-sixth aspect, in combination with the sixty-fourth aspect, the second set of DMRS is associated with an antenna port having a lowest index of a plurality of antenna ports configured to receive the DMRS at the device.

[0290] In some aspects, a device configured for wireless communication (such as a transmitting node) is configured to send multiple DMRS to a UE, the multiple DMRS including a first set of DMRSs assigned to a first DMRS symbol and a first subset of subcarriers and a second set of DMRSs assigned to a second DMRS symbol and a second subset of subcarriers. The device is also configured to send a PTRS associated with the multiple DMRS to the UE. The device is also configured to receive a channel estimate from the UE. The channel estimate is based on the multiple DMRS and the PTRS. In some implementations, as a non-limiting example, the device includes a wireless device, such as a transmitting node, which may include or correspond to a network entity or a second UE. In some implementations, the device may include at least one processor and a memory coupled to the processor. The processor may be configured to perform the operations described herein for the wireless device. In some other implementations, the device may include a non-transitory computer-readable medium having a program code recorded thereon, and the program code may be executed by a computer to cause the computer to perform the operations described herein with reference to the wireless device. In some implementations, the device may include one or more components configured to perform the operations described herein.

[0291] In a sixty-seventh aspect, a first set of DMRS is associated with a first antenna port and a second set of DMRS is associated with a second antenna port.

[0292] In the sixty-eighth aspect, in combination with the sixty-seventh aspect, the first antenna port is included in a first CDM group configured for the UE, and the second antenna port is included in a second CDM group configured for the UE.

[0293] In a sixty-ninth aspect, alone or in combination with one or more of the sixty-seventh to sixty-eighth aspects, the apparatus sends an instruction to a UE, the instruction being to combine the first antenna port and the second antenna port into a single virtual port for performing channel estimation.

[0294] In the seventieth aspect, alone or in combination with one or more of the sixty-seventh to sixty-ninth aspects, the first DMRS symbol and the second DMRS symbol are consecutive symbols.

[0295] In the seventy-first aspect, alone or in combination with one or more of the sixty-seventh to sixty-ninth aspects, the first DMRS symbol and the second DMRS symbol are non-contiguous symbols.

[0296] In aspect seventy-second, either alone or in combination with one or more of aspects sixty-seven to seventy-first, the apparatus allocates a PTRS to one or more symbols following a first DMRS symbol and to one or more subcarriers of a first subset of subcarriers.

[0297] In a seventy-third aspect, in combination with the seventy-second aspect, the first set of DMRS is associated with an antenna port having a lowest index of a plurality of antenna ports configured to receive DMRS at the UE.

[0298] In aspect 74, alone or in combination with one or more of aspects 72 to 73, one or more symbols following the first DMRS symbol are also following the second DMRS symbol.

[0299] In aspect seventy-fifth, alone or in combination with one or more of aspects seventy-two to seventy-three, the one or more symbols following the first DMRS symbol include a first set of symbols between the first DMRS symbol and the second DMRS symbol and a second set of symbols following the second DMRS symbol.

[0300] In a seventy-sixth aspect, alone or in combination with one or more of aspects seventy-two to seventy-fifth, the apparatus comprises a network entity, and a plurality of DMRS and PTRS are associated with a PDSCH between the network entity and a UE.

[0301] In a seventy-seventh aspect, alone or in combination with one or more of aspects seventy-two to seventy-five, the apparatus includes a second UE, and a plurality of DMRS and PTRS are associated with a PSSCH between the second UE and the UE.

[0302] In a seventy-eighth aspect, alone or in combination with one or more of aspects seventy-two to seventy-seven, the PTRS comprises an NZP PTRS allocated to a first subset of one or more symbols and a ZP PTRS allocated to a second subset of one or more symbols.

[0303] In a seventy-ninth aspect, in combination with the seventy-eighth aspect, the first subset of one or more symbols and the second subset of one or more symbols are fixed across one or more subcarriers of the first subset of subcarriers.

[0304] In an eightieth aspect, alone or in combination with one or more of aspects seventy-eight to seventy-ninth, the apparatus comprises a network entity, and a plurality of DMRS and PTRS are associated with a PDSCH between the network entity and a UE.

[0305] In the eighty-first aspect, alone or in combination with one or more of aspects seventy-second to seventy-seven, the apparatus includes a second UE, the PTRS includes an NZP PTRS allocated to a first subset of one or more symbols and a ZP PTRS allocated to a second subset of one or more symbols, and the multiple DMRS and PTRS are associated with a PSSCH between the second UE and the UE.

[0306] In an eighty-second aspect, in combination with the eighty-first aspect, the first subset of one or more symbols and the second subset of one or more symbols are fixed across one or more subcarriers of the first subset of subcarriers.

[0307] In aspect 83, alone or in combination with one or more of aspects 67 to 71, the apparatus optionally allocates PTRS to a first set of symbols between a first DMRS symbol and a second DMRS symbol and one or more subcarriers of a first subset of subcarriers, and allocates PTRS to a second set of symbols after a second DMRS symbol and one or more subcarriers of a second subset of subcarriers.

[0308] In an eighty-fourth aspect, in combination with the eighty-third aspect, a PTRS is not allocated to a first set of symbols and one or more subcarriers of a first subset of subcarriers.

[0309] In the eighty-fifth aspect, in combination with the eighty-third aspect, the PTRS is allocated to a first set of symbols and one or more subcarriers of a first subset of subcarriers.

[0310] In an eighty-sixth aspect, alone or in combination with one or more of aspects eighty-three to eighty-five, the apparatus sends a first higher layer parameter associated with a first set of DMRS and a second higher layer parameter associated with a second set of DMRS to a UE. The first higher layer parameter indicates an offset of the first set of symbols, and the second higher layer parameter indicates an offset of the second set of symbols.

[0311] In aspect eighty-seven, either alone or in combination with one or more of aspects eighty-three to eighty-five, the offset of a first set of symbols is based on a first predetermined value stored in a memory of the device, and the offset of a second set of symbols is based on a second predetermined value stored in the memory.

[0312] In an eighty-eighth aspect, in combination with the eighty-seventh aspect, the memory is configured to store a plurality of predetermined values ​​corresponding to one or more configurations of a plurality of DMRSs, one or more combs for communicating a plurality of DMRSs, or both.

[0313] In an eighty-ninth aspect, either alone or in combination with one or more of aspects eighty-three to eighty-eight, the first set of symbols and the second set of symbols exclude one or more symbols assigned to a DC tone.

[0314] In a ninetieth aspect, alone or in combination with one or more of aspects eighty-third to eighty-ninth, the apparatus comprises a network entity, and a plurality of DMRS and PTRS are associated with a PDSCH between the network entity and a UE.

[0315] In a ninety-first aspect, alone or in combination with one or more of aspects eighty-third to eighty-ninth, the apparatus includes a second UE, and a plurality of DMRS and PTRS are associated with a PSSCH between the second UE and the UE.

[0316] In aspect ninety-second, alone or in combination with one or more of aspects eighty-third to ninety-first, the PTRS comprises an NZP PTRS assigned to a first subset of a first set of symbols and a first subset of a second set of symbols, and a ZP PTRS assigned to a second subset of the first set of symbols and a second subset of the second set of symbols.

[0317] In aspect ninety-third, in combination with aspect ninety-second, a first subset of the first set of symbols and a second subset of the first set of symbols are associated with one or more of a first subset of subcarriers, and a first subset of the second set of symbols and a second subset of the second set of symbols are associated with a second subset of subcarriers.

[0318] In a ninety-fourth aspect, alone or in combination with one or more of aspects ninety-two to ninety-three, the apparatus transmits DCI to a UE. The DCI includes a field indicating that a ZP PTRS is associated with a plurality of subsets of subcarriers, wherein the transmitting node comprises a network entity.

[0319] In the ninety-fifth aspect, in combination with the ninety-fourth aspect, the field comprises a single bit.

[0320] In a ninety-sixth aspect, either alone or in combination with one or more of aspects ninety-four to ninety-five, the DCI indicates an offset of a second subset of the first set of symbols, an offset of a second subset of the second set of symbols, or both.

[0321] In a ninety-sixth aspect, either alone or in combination with one or more of aspects ninety-two to ninety-three, an offset of a second subset of a first set of symbols, an offset of a second subset of a second set of symbols, or both, is based on one or more predefined values ​​stored in a memory of the device.

[0322] In a ninety-seventh aspect, alone or in combination with one or more of aspects ninety-second to ninety-six, the apparatus comprises a network entity, and a plurality of DMRS and PTRS are associated with a PDSCH between the network entity and a UE.

[0323] In a ninety-eighth aspect, alone or in combination with one or more of aspects 83 to ninety-one, the apparatus includes a second UE, the PTRS including an NZP PTRS allocated to a first subset of a first set of symbols and a first subset of a second set of symbols and a ZP PTRS allocated to a second subset of the first set of symbols and a second subset of the second set of symbols, and the multiple DMRS and PTRS are associated with a PSSCH between the second UE and the UE.

[0324] In the ninety-ninth aspect, in combination with the ninety-eighth aspect, the first subset of the first set of symbols and the second subset of the first set of symbols are associated with one or more of the first subset of subcarriers, and the first subset of the second set of symbols and the second subset of the second set of symbols are associated with the second subset of subcarriers.

[0325] In a 100th aspect, alone or in combination with one or more of aspects 98 to 99, the apparatus sends an SCI-1 to a UE. The SCI-1 includes a field indicating that the ZP PTRS is associated with a plurality of subsets of subcarriers.

[0326] In the one hundred and first aspect, in combination with the one hundredth aspect, the field comprises a single bit.

[0327] In a one-hundred-second aspect, either alone or in combination with one or more of the one-hundred-to-one-hundred-first aspects, the SCI-1 indicates an offset of a second subset of the first set of symbols, an offset of a second subset of the second set of symbols, or both.

[0328] In aspect one hundred and three, either alone or in combination with one or more of aspects ninety-eight to ninety-nine, an offset of a second subset of a first set of symbols, an offset of a second subset of a second set of symbols, or both, is based on one or more predefined values ​​stored in a memory of the device.

[0329] In a one hundred and fourth aspect, alone or in combination with one or more of aspects 83 to 91, the apparatus comprises a network entity, and the apparatus sends a DCI to a UE. The DCI indicates that the ZP PTRS is associated with a plurality of subsets of subcarriers.

[0330] In the one-hundred-and-fifth aspect, in combination with the one-hundred-and-fourth aspect, the DCI indicates an offset of the ZP PTRS.

[0331] In aspect 106, either alone or in combination with one or more of aspects 67 to 71, the apparatus allocates PTRS to one or more symbols following a second DMRS symbol and to one or more subcarriers of a second subset of subcarriers.

[0332] In a one-hundred and seventh aspect, in combination with the one-hundred and sixth aspect, the first set of DMRS is associated with antenna ports having a lower index than antenna ports associated with the second set of DMRS.

[0333] In a one-hundred and eighth aspect, in combination with the one-hundred and sixth aspect, the second set of DMRS is associated with an antenna port having a lowest index of a plurality of antenna ports configured to receive the DMRS at the UE.

[0334] In a one-hundred and ninth aspect, alone or in combination with one or more of aspects one-hundred and sixth to one-hundred and eighth, the apparatus comprises a network entity, and a plurality of DMRS and PTRS are associated with a PDSCH between the network entity and a UE.

[0335] In a one hundred and tenth aspect, alone or in combination with one or more of aspects one hundred and six to one hundred and nine, the PTRS comprises an NZP PTRS allocated to a first subset of one or more symbols and a ZP PTRS allocated to a second subset of one or more symbols.

[0336] In a one hundred and eleven aspect, in combination with the one hundred and ten aspect, the first subset of one or more symbols and the second subset of one or more symbols are fixed across one or more of the second subset of subcarriers.

[0337] In a 112th aspect, alone or in combination with one or more of aspects 110 to 111, the apparatus includes a network entity, and a plurality of DMRS and PTRS are associated with a PDSCH between the network entity and a UE.

[0338] In some aspects, a device configured for wireless communication (such as a network entity) is configured to receive multiple DMRS from a UE, the multiple DMRS including a first set of DMRSs assigned to a first DMRS symbol and a first subset of subcarriers and a second set of DMRSs assigned to a second DMRS symbol and a second subset of subcarriers. The device is also configured to receive PTRS associated with the multiple DMRSs from the UE. The device is also configured to perform channel estimation based on the multiple DMRSs, and to perform a phase tracking process based on the multiple DMRSs and PTRSs. In some implementations, the device includes a wireless device, such as a network entity. In some implementations, the device may include at least one processor and a memory coupled to the processor. The processor may be configured to perform the operations described herein for the wireless device. In some other implementations, the device may include a non-temporary computer-readable medium having a program code recorded thereon, and the program code may be executed by a computer to cause the computer to perform the operations described herein with reference to the wireless device. In some implementations, the device may include one or more components configured to perform the operations described herein.

[0339] In a one-hundred-thirteenth aspect, a plurality of DMRS and PTRS are associated with a PUSCH between a device and a UE.

[0340] In a fourteenth aspect, alone or in combination with the thirteenth aspect, a first set of DMRS is associated with a first antenna port and a second set of DMRS is associated with a second antenna port.

[0341] In a fifteenth aspect, in combination with the fourteenth aspect, the first antenna port is included in a first CDM group configured for the UE, and the second antenna port is included in a second CDM group configured for the UE.

[0342] In a one-hundred and sixteenth aspect, alone or in combination with one or more of the one-hundred and thirteenth to fifteenth aspects, the first DMRS symbol and the second DMRS symbol are consecutive symbols.

[0343] In a one-hundred-seventeenth aspect, alone or in combination with one or more of the one-hundred-thirteenth to one-hundred-fifteenth aspects, the first DMRS symbol and the second DMRS symbol are non-contiguous symbols.

[0344] In a one-hundred and eighteenth aspect, alone or in combination with one or more of the one-hundred and thirteenth to seventeenth aspects, the PTRS is allocated to one or more symbols following the first DMRS symbol and to one or more subcarriers of the first subset of subcarriers.

[0345] In the one-hundred-nineteenth aspect, in combination with the one-hundred-eighteenth aspect, one or more symbols after the first DMRS symbol are also after the second DMRS symbol.

[0346] In the one hundred and twentieth aspect, in combination with the one hundred and eighteenth aspect, the one or more symbols after the first DMRS symbol include a first set of symbols between the first DMRS symbol and the second DMRS symbol and a second set of symbols after the second DMRS symbol.

[0347] In aspect 121, alone or in combination with one or more of aspects 113 to 117, the PTRS is optionally allocated to a first set of symbols between a first DMRS symbol and a second DMRS symbol and one or more subcarriers of a first subset of subcarriers, and allocated to a second set of symbols after the second DMRS symbol and one or more subcarriers of a second subset of subcarriers.

[0348] In a one hundred and twenty-second aspect, in combination with the one hundred and twenty-first aspect, the apparatus receives from a UE a first higher layer parameter associated with a first set of DMRS and a second higher layer parameter associated with a second set of DMRS. The first higher layer parameter indicates an offset of the first set of symbols, and wherein the second higher layer parameter indicates an offset of the second set of symbols.

[0349] In a one-hundred and twenty-third aspect, in combination with the one-hundred and twenty-first aspect, an offset of a first set of symbols is based on a first predetermined value stored in a memory of the UE, and an offset of a second set of symbols is based on a second predetermined value stored in the memory.

[0350] In a one hundred and twenty-fourth aspect, either alone or in combination with one or more of aspects one hundred and twenty-one to one hundred and twenty-three, the first set of symbols and the second set of symbols do not include one or more symbols assigned to a DC tone.

[0351] In a one-hundred and twenty-fifth aspect, alone or in combination with one or more of aspects one-hundred and thirteen to seventeen, a PTRS is allocated to one or more symbols following a second DMRS symbol and to one or more subcarriers of a second subset of subcarriers.

[0352] In a one-hundred and twenty-sixth aspect, in combination with the one-hundred and twenty-fifth aspect, the first set of DMRS is associated with antenna ports having a lower index than antenna ports associated with the second set of DMRS.

[0353] In a 127th aspect combined with the 125th aspect, the second set of DMRS is associated with an antenna port having a lowest index of a plurality of antenna ports configured to receive DMRS at the UE.

[0354] Those skilled in the art will appreciate that any of a variety of different techniques and methods may be used to represent information and signals. For example, data, instructions, commands, information, signals, bits, symbols, and chips that may be mentioned throughout the above description may be represented by voltages, currents, electromagnetic waves, magnetic fields or particles, optical fields or particles, or any combination thereof.

[0355] References Figure 2 , 5 , 6, 13 and 16 described components, functional blocks and modules may include processors, electronic devices, hardware devices, electronic components, logic circuits, memories, software codes, firmware codes, etc., or any combination thereof. Figure 1-16 The features discussed may be implemented by dedicated processor circuits, by executable instructions, and / or a combination thereof.

[0356] Those skilled in the art will further appreciate that the various illustrative logical blocks, modules, circuits, and algorithm steps (e.g., Fig.11 , 12 , 14 and 15) can be implemented as electronic hardware, computer software or a combination of the two. In order to clearly illustrate this interchangeability of hardware and software, various illustrative components, blocks, modules, circuits and steps have been generally described above according to their functions. Whether such functions are implemented as hardware or software depends on the specific application and the design constraints on the entire system. A skilled person can implement the described functions in different ways for each specific application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present disclosure. Those skilled in the art will also readily recognize that the order or combination of components, methods or interactions described herein are merely examples, and the components, methods or interactions of various aspects of the present disclosure may be combined or performed in a manner different from that shown and described herein.

[0357] The various exemplary logic blocks, modules, and circuits described in conjunction with the disclosure herein may be implemented or executed with a general purpose processor, a digital signal processor (DSP), an application specific integrated circuit (ASIC), a field programmable gate array (FPGA) or other programmable logic device, discrete gate or transistor logic, discrete hardware components, or any combination thereof designed to perform the functions described herein. A general purpose processor may be a microprocessor, but alternatively, the processor may be any conventional processor, controller, microcontroller, or state machine. The processor may also be implemented as a combination of computing devices, such as a combination of a DSP and a microprocessor, a plurality of microprocessors, a combination of one or more microprocessors and a DSP core, or any other such configuration.

[0358] The steps of the method or algorithm described in conjunction with the disclosure herein may be directly embodied in hardware, a software module executed by a processor, or a combination of the two. The software module may reside in a RAM memory, a flash memory, a ROM memory, an EPROM memory, an EEPROM memory, a register, a hard disk, a removable disk, a CD-ROM, or any other form of storage medium known in the art. An exemplary storage medium is coupled to the processor so that the processor can read information from the storage medium and write information to the storage medium. Alternatively, the storage medium may be integrated into the processor. The processor and the storage medium may reside in an ASIC. The ASIC may reside in a user terminal. Alternatively, the processor and the storage medium may reside in a user terminal as discrete components.

[0359] In one or more exemplary designs, the functions described may be implemented with hardware, software, firmware, or any combination thereof. If implemented with software, these functions may be stored or transmitted as one or more instructions or codes on a computer-readable medium. Computer-readable media include computer storage media and communication media, including any media that facilitates the transfer of a computer program from one place to another. Computer-readable storage media may be any available media that can be accessed by a general-purpose or special-purpose computer. As an example and not limitation, such computer-readable media may include RAM, ROM, EEPROM, CD-ROM or other optical disk storage, disk storage or other magnetic storage devices, or any other media that can be used to carry or store desired program code devices in the form of instructions or data structures and can be accessed by a general-purpose or special-purpose computer or a general-purpose or special-purpose processor. In addition, a connection may be appropriately referred to as a computer-readable medium. For example, if a coaxial cable, fiber optic cable, twisted pair, or digital subscriber line (DSL) is used to transmit software from a website, server, or other remote source, the coaxial cable, fiber optic cable, twisted pair, or DSL are all included in the definition of the medium. Disk and disc as used herein include compact disc (CD), laser disc, optical disc, digital versatile disc (DVD), hard disk, solid state disk and Blu-ray disc, where disks usually reproduce data magnetically, while optical discs reproduce data optically with lasers. Combinations of the above should also be included within the scope of computer-readable media.

[0360] As used herein, including in the claims, the term "and / or," when used in a list of two or more items, means that any one of the listed items may be used alone, or any combination of two or more of the listed items may be used. For example, if a composition is described as comprising components A, B, and / or C, the composition may comprise only A; only B; only C; a combination of A and B; a combination of A and C; a combination of B and C; or a combination of A, B, and C. Furthermore, as used herein, including in the claims, "or" used in a list of items ending with "at least one of" means a disjunctive list, such that, for example, a list of "at least one of A, B, or C" means any one of A or B or C or AB or AC or BC or ABC (i.e., A and B and C), or any combination thereof.

[0361] The foregoing description of the present disclosure is provided to enable any person skilled in the art to make or use the present disclosure. Various modifications to the present disclosure will be apparent to those skilled in the art, and the general principles defined herein may be applied to other variations without departing from the spirit or scope of the present disclosure. Therefore, the present disclosure is not intended to be limited to the examples and designs described herein, but to conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A method for wireless communication performed by a user equipment UE, the method comprising: receiving a plurality of demodulation reference signals DMRS from a network entity or a second UE, the plurality of demodulation reference signals comprising a first set of DMRSs allocated to a first DMRS symbol and a first subset of subcarriers and a second set of DMRSs allocated to a second DMRS symbol and a second subset of subcarriers, wherein the first set of DMRSs and the second set of DMRSs are allocated in a staggered configuration such that the first set of DMRSs occupies a first DMRS symbol and the second set of DMRSs occupies a second DMRS symbol, and wherein the second DMRS symbol is different from the first DMRS symbol; receiving a phase tracking reference signal PTRS associated with a plurality of DMRSs from a network entity or a second UE; and Channel and phase noise estimation is performed based on multiple DMRS and PTRS.

2. The method according to claim 1, wherein: A first antenna port associated with a first set of DMRS is included in a first code division multiplexing (CDM) group configured for the UE, wherein a second antenna port associated with a second set of DMRS is included in a second CDM group configured for the UE.

3. The method of claim 1 , further comprising combining a first antenna port associated with a first set of DMRS and a second antenna port associated with a second set of DMRS into a single virtual port, wherein the channel and phase noise estimation are performed using the single virtual port.

4. The method according to claim 1, wherein: The PTRS is allocated to one or more symbols after the first DMRS symbol and one or more subcarriers of the first subset of subcarriers.

5. The method according to claim 4, wherein: The first set of DMRS is associated with an antenna port having a lowest index of a plurality of antenna ports configured to receive DMRS at the UE.

6. The method according to claim 4, wherein: One or more symbols following the first DMRS symbol also follow the second DMRS symbol.

7. The method according to claim 4, wherein: The one or more symbols following the first DMRS symbol include a first set of symbols between the first DMRS symbol and the second DMRS symbol and a second set of symbols following the second DMRS symbol.

8. The method according to claim 4, wherein: Performing channel and phase noise estimation includes interpolating phase between resource elements of the first set of DMRS and the second set of DMRS.

9. The method according to claim 4, wherein: The PTRS includes a non-zero power NZP PTRS allocated to a first subset of the one or more symbols and a zero power ZP PTRS allocated to a second subset of the one or more symbols.

10. The method according to claim 4, wherein: The PTRS includes a non-zero power NZP PTRS allocated to a first subset of one or more symbols and a zero power ZP PTRS allocated to a second subset of one or more symbols, and wherein the multiple DMRS and PTRS are associated with a physical sidelink shared channel PSSCH between the UE and the second UE.

11. An apparatus configured for wireless communication at a user equipment UE, the apparatus comprising: at least one processor; and a memory coupled to at least one processor, Wherein, at least one processor is configured to, when executing instructions stored in the memory, cause the apparatus to: receiving a plurality of demodulation reference signals (DMRS) from a network entity or a second user equipment (UE), the plurality of DMRS comprising a first set of DMRSs allocated to a first DMRS symbol and a first subset of subcarriers and a second set of DMRSs allocated to a second DMRS symbol and a second subset of subcarriers, wherein the first set of DMRSs and the second set of DMRSs are allocated in a staggered configuration such that the first set of DMRSs occupies a first DMRS symbol and the second set of DMRSs occupies a second DMRS symbol, and wherein the second DMRS symbol is different from the first DMRS symbol; receiving a phase tracking reference signal PTRS associated with a plurality of DMRSs from a network entity or a second UE; and Channel and phase noise estimation is performed based on multiple DMRS and PTRS.

12. The device according to claim 11, wherein The first DMRS symbol and the second DMRS symbol are consecutive symbols.

13. The device according to claim 11, wherein: The first DMRS symbol and the second DMRS symbol are non-contiguous symbols.

14. The device according to claim 11, wherein: The PTRS is optionally allocated to a first set of symbols between the first DMRS symbol and the second DMRS symbol and one or more subcarriers of a first subset of subcarriers, and to a second set of symbols after the second DMRS symbol and one or more subcarriers of a second subset of subcarriers.

15. The device according to claim 14, wherein: The at least one processor is also configured to, when executing the instructions stored in the memory, cause the apparatus to receive, from a network entity or a second UE, a first higher layer parameter associated with a first set of DMRS and a second higher layer parameter associated with a second set of DMRS, wherein the first higher layer parameter indicates an offset of the first set of symbols, and wherein the second higher layer parameter indicates an offset of the second set of symbols.

16. The apparatus of claim 14, wherein the at least one processor is further configured to, when executing instructions stored in the memory, cause the apparatus to select a first predetermined value and a second predetermined value from a plurality of predetermined values ​​stored in the memory based on a configuration of a plurality of DMRSs, one or more combs for communicating the plurality of DMRSs, or both, wherein an offset of the first set of symbols is based on the first predetermined value, and wherein an offset of the second set of symbols is based on the second predetermined value.

17. The device according to claim 14, wherein: The first set of symbols and the second set of symbols exclude one or more symbols assigned to a direct current (DC) tone.

18. A method for performing wireless communication by a transmitting node, the method comprising: transmitting, from a transmitting node, a plurality of demodulation reference signals DMRS to a user equipment UE, the plurality of DMRS comprising a first set of DMRS allocated to a first DMRS symbol and a first subset of subcarriers and a second set of DMRS allocated to a second DMRS symbol and a second subset of subcarriers, wherein the first set of DMRS and the second set of DMRS are allocated in a staggered configuration such that the first set of DMRS occupies a first DMRS symbol and the second set of DMRS occupies a second DMRS symbol, and wherein the second DMRS symbol is different from the first DMRS symbol; Sending a phase tracking reference signal PTRS associated with a plurality of DMRSs to a UE; and A channel estimate is received from the UE, the channel estimate being based on the plurality of DMRSs and PTRSs.

19. The method according to claim 18, further comprising: assigning a PTRS to a first set of symbols between a first DMRS symbol and a second DMRS symbol and to one or more subcarriers of a first subset of subcarriers; and The PTRS is allocated to a second set of symbols following the second DMRS symbol and to one or more subcarriers of a second subset of subcarriers.

20. The method according to claim 19, wherein: The PTRS include non-zero power NZP PTRS allocated to a first subset of the first set of symbols and a first subset of the second set of symbols, and zero power ZP PTRS allocated to a second subset of the first set of symbols and a second subset of the second set of symbols.

21. The method of claim 20, further comprising sending downlink control information (DCI) to the UE, the DCI comprising a field indicating that the ZP PTRS is associated with a plurality of subsets of subcarriers, wherein the sending node comprises a network entity.

22. The method according to claim 20, wherein: The offset of the second subset of the first set of symbols, the offset of the second subset of the second set of symbols, or both are based on one or more predefined values ​​stored in a memory of the transmitting node.

23. The method of claim 20, further comprising sending sidelink control information 1, SCI-1, to the UE, the SCI-1 comprising a field indicating that the ZP PTRS is associated with multiple subsets of subcarriers, wherein the transmitting node comprises a second UE, and wherein the multiple DMRS and PTRS are associated with a physical sidelink shared channel, PSSCH, between the second UE and the UE.

24. The method according to claim 20, wherein: The transmitting node includes a second UE, wherein multiple DMRS and PTRS are associated with a physical side link shared channel PSSCH between the second UE and the UE, wherein an offset of a second subset of a first set of symbols, an offset of a second subset of a second set of symbols, or both are based on one or more predefined values ​​stored in a memory of the transmitting node.

25. The method of claim 19, wherein the transmitting node comprises a network entity, and further comprising transmitting downlink control information (DCI) to the UE, the DCI indicating that zero power (ZP) PTRS is associated with a plurality of subsets of subcarriers.

26. An apparatus configured for wireless communication at a transmitting node, the apparatus comprising: at least one processor; and a memory coupled to at least one processor, Wherein, at least one processor is configured to, when executing instructions stored in the memory, cause the apparatus to: initiating transmission of a plurality of demodulation reference signals DMRS to a user equipment UE, the plurality of DMRS comprising a first set of DMRS allocated to a first DMRS symbol and a first subset of subcarriers and a second set of DMRS allocated to a second DMRS symbol and a second subset of subcarriers, wherein the first set of DMRS and the second set of DMRS are allocated in a staggered configuration such that the first set of DMRS occupies a first DMRS symbol and the second set of DMRS occupies a second DMRS symbol, and wherein the second DMRS symbol is different from the first DMRS symbol; Initiate transmission of a phase tracking reference signal PTRS associated with a plurality of DMRSs to the UE; and A channel estimate is received from the UE, the channel estimate being based on the plurality of DMRSs and PTRSs.

27. The device according to claim 26, wherein: The at least one processor is further configured to, when executing the instructions stored in the memory, cause the apparatus to assign the PTRS to one or more symbols following the second DMRS symbol and to one or more subcarriers of the second subset of subcarriers.

28. The apparatus of claim 27, wherein the first set of DMRS is associated with antenna ports having a lower index than antenna ports associated with the second set of DMRS.

29. The apparatus of claim 27, wherein the second set of DMRS is associated with an antenna port having a lowest index of a plurality of antenna ports configured to receive DMRS at the UE.

30. The device according to claim 27, wherein: The PTRS includes a non-zero power NZP PTRS allocated to a first subset of one or more symbols and a zero power ZP PTRS allocated to a second subset of one or more symbols, and wherein the first subset of one or more symbols and the second subset of one or more symbols are fixed across one or more subcarriers of the second subset of subcarriers.

31. A computer readable medium storing instructions which, when executed by a processor, cause the processor to perform the method according to any one of claims 1 to 10.

32. A computer readable medium storing instructions which, when executed by a processor, cause the processor to perform the method according to any one of claims 18 to 25.

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