Phase noise cancellation using a single pilot phase noise tracking reference signal

Abstract

Methods, systems, and devices for wireless communications are described. In some examples, a user equipment (UE) may estimate phase noise using a phase noise tracking reference signal (PTRS). A network entity may transmit a PTRS waveform to the UE including a single pilot tone with a boosted transmission power that is surrounded by zero-amplitude tones based on a capability of the UE. The network entity may transmit control signaling indicating that the PTRS waveform includes the single pilot tone. Additionally, the network entity may indicate a size of the PTRS waveform, a location of the pilot tone relative to the zero-amplitude tones, and locations of the pilot tone and the zero-amplitude tones within a wireless channel. The UE may select a phase noise estimation algorithm based on the capability of the UE and the control signaling and may estimate the phase noise in accordance with the selected algorithm.

Description

PHASE NOISE CANCELLATION USING A SINGLE PILOT PHASE NOISE TRACKING REFERENCE SIGNALCROSS REFERENCE

[0001] The present Application for Patent claims priority to Israel Patent Application No. 312307 by EISTEIN et al., entitled “PHASE NOISE CANCELLATION USING A SINGLE PILOT PHASE NOISE TRACKING REFERENCE SIGNAL,” filed April 19, 2024, assigned to the assignee hereof, and expressly incorporated by reference in its entirety herein.FIELD OF TECHNOLOGY

[0002] The following relates to wireless communications, including phase noise cancellation using a single pilot phase noise tracking reference signal.BACKGROUND

[0003] Wireless communications systems are widely deployed to provide various types of communication content such as voice, video, packet data, messaging, broadcast, and so on. These systems may be capable of supporting communication with multiple users by sharing the available system resources (e.g., time, frequency, and power). Examples of such multiple-access systems include fourth generation (4G) systems such as Long Term Evolution (LTE) systems, LTE- Advanced (LTE-A) systems, or LTE-A Pro systems, and fifth generation (5G) systems which may be referred to as New Radio (NR) systems. These systems may employ technologies such as code division multiple access (CDMA), time division multiple access (TDMA), frequency division multiple access (FDMA), orthogonal FDMA (OFDMA), or discrete Fourier transform spread orthogonal frequency division multiplexing (DFT-S-OFDM). A wireless multiple-access communications system may include one or more base stations, each supporting wireless communication for communication devices, which may be known as user equipment (UE).SUMMARY

[0004] The described techniques relate to improved methods, systems, devices, and apparatuses that support phase noise cancellation using a single pilot phase noise tracking reference signal (PTRS). For example, the described techniques provide for a UE estimating phase noise from a single-pilot phase noise tracking reference signal. A network entity may transmit control signaling to the UE indicating a type associated with a PTRS. The PTRS (e.g., the type of the PTRS) may be based on a capability of the UE. In some examples, the network entity may transmit a PTRS waveform to the UE including a single pilot tone surrounded by zero-amplitude tones based on a capability of the UE. The network entity may transmit the single pilot PTRS waveform with a boosted transmission power. Additionally, the network entity may indicate a size of the PTRS (e.g., a bandwidth), a location of the pilot tone (e.g., location of a non-zero PTRS tone) relative to the zero-amplitude tones, and locations of the pilot tone and the zeroamplitude tones within a wireless channel. The UE may select a phase noise estimation algorithm based on the capability of the UE and the indication. The UE may receive the PTRS waveform and use the PTRS waveform to estimate a phase noise in accordance with the selected algorithm. The UE may use the phase noise estimate to demodulate data transmitted with the PTRS waveform.

[0005] A method for wireless communications by a UE is described. The method may include transmitting, to a network entity, a capability message indicating that the UE supports a single pilot tone scheme for phase noise cancellation, receiving, from the network entity, control signaling indicating a configuration of a PTRS waveform based on the capability message, where the configuration indicates that the PTRS waveform includes a single pilot tone surrounded by a set of multiple zero-amplitude tones within a transmission time interval (TTI), receiving, within the TTI, the PTRS waveform in accordance with the configuration, and receiving, within the TTI, a data message based on a phase noise cancellation operation performed using the PTRS waveform.

[0006] A UE for wireless communications is described. The UE may include one or more memories storing processor executable code, and one or more processors coupled with the one or more memories. The one or more processors may individually or collectively be operable to execute the code to cause the UE to transmit, to a network entity, a capability message indicating that the UE supports a single pilot tone schemefor phase noise cancellation, receive, from the network entity, control signaling indicating a configuration of a PTRS waveform based on the capability message, where the configuration indicates that the PTRS waveform includes a single pilot tone surrounded by a set of multiple zero-amplitude tones within a TTI, receive, within the TTI, the PTRS waveform in accordance with the configuration, and receive, within the TTI, a data message based on a phase noise cancellation operation performed using the PTRS waveform.

[0007] Another UE for wireless communications is described. The UE may include means for transmitting, to a network entity, a capability message indicating that the UE supports a single pilot tone scheme for phase noise cancellation, means for receiving, from the network entity, control signaling indicating a configuration of a PTRS waveform based on the capability message, where the configuration indicates that the PTRS waveform includes a single pilot tone surrounded by a set of multiple zeroamplitude tones within a TTI, means for receiving, within the TTI, the PTRS waveform in accordance with the configuration, and means for receiving, within the TTI, a data message based on a phase noise cancellation operation performed using the PTRS waveform.

[0008] A non-transitory computer-readable medium storing code for wireless communications is described. The code may include instructions executable by one or more processors to transmit, to a network entity, a capability message indicating that the UE supports a single pilot tone scheme for phase noise cancellation, receive, from the network entity, control signaling indicating a configuration of a PTRS waveform based on the capability message, where the configuration indicates that the PTRS waveform includes a single pilot tone surrounded by a set of multiple zero-amplitude tones within a TTI, receive, within the TTI, the PTRS waveform in accordance with the configuration, and receive, within the TTI, a data message based on a phase noise cancellation operation performed using the PTRS waveform.

[0009] In some examples of the method, UEs, and non-transitory computer-readable medium described herein, receiving the control signaling may include operations, features, means, or instructions for receiving a control message indicating the configuration that identifies one or more parameters associated with the PTRS waveform, the one or more parameters including a bandwidth of the PTRS waveform, alocation of the bandwidth of the PTRS waveform within a channel, a location of the single pilot tone within the bandwidth of the PTRS waveform, or any combination thereof.

[0010] In some examples of the method, UEs, and non-transitory computer-readable medium described herein, receiving the control signaling may include operations, features, means, or instructions for receiving a control message that indicates a channel including a subchannel for the PTRS waveform and a second subchannel for the data message.

[0011] Some examples of the method, UEs, and non-transitory computer-readable medium described herein may further include operations, features, means, or instructions for receiving an indication of an updated configuration for the PTRS waveform, receiving, within a second TTI, a second PTRS waveform in accordance with the updated configuration, and receiving, within the second TTI, a second data message based on a second phase noise cancellation operation performed using the second PTRS waveform.

[0012] Some examples of the method, UEs, and non-transitory computer-readable medium described herein may further include operations, features, means, or instructions for demodulating the data message using an estimated phase noise of the phase noise cancellation operation.

[0013] Some examples of the method, UEs, and non-transitory computer-readable medium described herein may further include operations, features, means, or instructions for estimating phase noise associated with a signal including the data message based on the PTRS waveform.

[0014] In some examples of the method, UEs, and non-transitory computer-readable medium described herein, transmitting the capability message may include operations, features, means, or instructions for transmitting a medium access control (MAC) control element (CE) indicating that the UE supports the single pilot tone scheme for phase noise cancellation.

[0015] A method for wireless communications by a network entity is described. The method may include obtaining, from a UE, a capability message indicating that the UEsupports a single pilot tone scheme for phase noise cancellation, outputting, to the UE, control signaling indicating a configuration for a PTRS waveform based on the capability message, where the configuration indicates that the PTRS waveform includes a single pilot tone surrounded by a set of multiple zero-amplitude tones within a TTI, outputting, within the TTI, the PTRS waveform in accordance with the configuration, and outputting, within the TTI, a data message.

[0016] A network entity for wireless communications is described. The network entity may include one or more memories storing processor executable code, and one or more processors coupled with the one or more memories. The one or more processors may individually or collectively be operable to execute the code to cause the network entity to obtain, from a UE, a capability message indicating that the UE supports a single pilot tone scheme for phase noise cancellation, output, to the UE, control signaling indicating a configuration for a PTRS waveform based on the capability message, where the configuration indicates that the PTRS waveform includes a single pilot tone surrounded by a set of multiple zero-amplitude tones within a TTI, output, within the TTI, the PTRS waveform in accordance with the configuration, and output, within the TTI, a data message.

[0017] Another network entity for wireless communications is described. The network entity may include means for obtaining, from a UE, a capability message indicating that the UE supports a single pilot tone scheme for phase noise cancellation, means for outputting, to the UE, control signaling indicating a configuration for a PTRS waveform based on the capability message, where the configuration indicates that the PTRS waveform includes a single pilot tone surrounded by a set of multiple zeroamplitude tones within a TTI, means for outputting, within the TTI, the PTRS waveform in accordance with the configuration, and means for outputting, within the TTI, a data message.

[0018] A non-transitory computer-readable medium storing code for wireless communications is described. The code may include instructions executable by one or more processors to obtain, from a UE, a capability message indicating that the UE supports a single pilot tone scheme for phase noise cancellation, output, to the UE, control signaling indicating a configuration for a PTRS waveform based on the capability message, where the configuration indicates that the PTRS waveform includesa single pilot tone surrounded by a set of multiple zero-amplitude tones within a TTI, output, within the TTI, the PTRS waveform in accordance with the configuration, and output, within the TTI, a data message.

[0019] In some examples of the method, network entities, and non-transitory computer-readable medium described herein, outputting the control signaling may include operations, features, means, or instructions for outputting a control message indicating the configuration that identifies one or more parameters associated with the PTRS waveform, the one or more parameters including a bandwidth of the PTRS waveform, a location of the bandwidth of the PTRS waveform within a channel, a location of the single pilot tone within the bandwidth of the PTRS waveform, or any combination thereof.

[0020] Some examples of the method, network entities, and non-transitory computer-readable medium described herein may further include operations, features, means, or instructions for outputting, to the UE, control signaling indicating an updated configuration for the PTRS waveform, outputting, within a second TTI, a second PTRS waveform in accordance with the updated configuration, and outputting, within the second TTI, a second data message.

[0021] In some examples of the method, network entities, and non-transitory computer-readable medium described herein, outputting the PTRS waveform may include operations, features, means, or instructions for outputting the single pilot tone at a first transmit power level that exceeds a second transmit power level of the data message.

[0022] In some examples of the method, network entities, and non-transitory computer-readable medium described herein, outputting the control signaling may include operations, features, means, or instructions for outputting a control message that indicates a channel including a subchannel for the PTRS waveform and a second subchannel for the data message.

[0023] In some examples of the method, network entities, and non-transitory computer-readable medium described herein, outputting the control signaling may include operations, features, means, or instructions for outputting downlink control information (DCI) indicating the configuration for the PTRS waveform.BRIEF DESCRIPTION OF THE DRAWINGS

[0024] FIG. 1 shows an example of a wireless communications system that supports phase noise cancellation using a single pilot phase noise tracking reference signal in accordance with one or more aspects of the present disclosure.

[0025] FIG. 2 shows an example of a wireless communications system that supports phase noise cancellation using a single pilot phase noise tracking reference signal in accordance with one or more aspects of the present disclosure.

[0026] FIGs. 3 A and 3B show examples of PTRS waveforms that supports phase noise cancellation using a single pilot phase noise tracking reference signal in accordance with one or more aspects of the present disclosure.

[0027] FIG. 4 shows an example of a channel diagram that supports phase noise cancellation using a single pilot phase noise tracking reference signal in accordance with one or more aspects of the present disclosure.

[0028] FIG. 5 shows an example of a process flow that supports phase noise cancellation using a single pilot phase noise tracking reference signal in accordance with one or more aspects of the present disclosure.

[0029] FIGs. 6 and 7 show block diagrams of devices that support phase noise cancellation using a single pilot phase noise tracking reference signal in accordance with one or more aspects of the present disclosure.

[0030] FIG. 8 shows a block diagram of a communications manager that supports phase noise cancellation using a single pilot phase noise tracking reference signal in accordance with one or more aspects of the present disclosure.

[0031] FIG. 9 shows a diagram of a system including a device that supports phase noise cancellation using a single pilot phase noise tracking reference signal in accordance with one or more aspects of the present disclosure.

[0032] FIGs. 10 and 11 show block diagrams of devices that support phase noise cancellation using a single pilot phase noise tracking reference signal in accordance with one or more aspects of the present disclosure.

[0033] FIG. 12 shows a block diagram of a communications manager that supports phase noise cancellation using a single pilot phase noise tracking reference signal in accordance with one or more aspects of the present disclosure.

[0034] FIG. 13 shows a diagram of a system including a device that supports phase noise cancellation using a single pilot phase noise tracking reference signal in accordance with one or more aspects of the present disclosure.

[0035] FIGs. 14 and 15 show flowcharts illustrating methods that support phase noise cancellation using a single pilot phase noise tracking reference signal in accordance with one or more aspects of the present disclosure.DETAILED DESCRIPTION

[0036] In some wireless communications systems, devices may communicate signaling in accordance with a modulation scheme. For example, a user equipment (UE) may modulate signaling transmitted to a network entity, or may receive modulated signaling from the network entity. In some cases, the modulation scheme may be limited by phase noise from the transmitting and receiving devices. To reduce phase noise, devices in the wireless communications system may support communicating phase tracking reference signals (PTRS) to assist in phase noise estimation and cancellation. However, current estimation techniques may have low correction performance or high complexity. For example, the PTRS may follow a legacy scheme, and the UE may only estimate and correct a portion of the phase noise corresponding to a common phase error. Alternatively, the PTRS may follow a continuous scheme, which may introduce additional computational complexity when estimating the phase noise.

[0037] Various aspects of the present disclosure are related to phase noise cancellation using a single pilot phase noise tracking reference signal. In some examples, a UE and a network entity may support communication of a PTRS based on a capability of the UE to support phase noise cancellation. The network entity may indicate a type of the PTRS waveform to the UE. In some examples, the type of the PTRS waveform (e.g., single-pilot, legacy, continuous) may be based on a capability of the UE. For example, the network entity may transmit, within a bandwidth, a PTRS waveform to the UE that includes a single pilot tone surrounded by zero-amplitude tones based on a capability of the UE. Additionally, the network entity may indicate asize of the PTRS, a location of the single non-zero amplitude pilot tone relative to the zero-amplitude tones, and locations of the pilot tone and the zero-amplitude tones within a wireless channel. The UE may determine a phase noise estimation algorithm based on the capability of the UE and the indication. By surrounding the pilot tone with zero-amplitude tones, the network entity may boost a transmission power of the nonzero amplitude pilot tone, reducing error associated with phase noise estimation.

[0038] Aspects of the disclosure are initially described in the context of wireless communications systems. Aspects of the disclosure are additionally illustrated by and described with reference to PTRS waveforms, channel diagrams, and process flows. Aspects of the disclosure are further illustrated by and described with reference to apparatus diagrams, system diagrams, and flowcharts that relate to phase noise cancellation using a single pilot phase noise tracking reference signal.

[0039] FIG. 1 shows an example of a wireless communications system 100 that supports phase noise cancellation using a single pilot phase noise tracking reference signal in accordance with one or more aspects of the present disclosure. The wireless communications system 100 may include one or more devices, such as one or more network devices (e.g., network entities 105), one or more UEs 115, and a core network 130. In some examples, the wireless communications system 100 may be a Long Term Evolution (LTE) network, an LTE- Advanced (LTE-A) network, an LTE-A Pro network, a New Radio (NR) network, or a network operating in accordance with other systems and radio technologies, including future systems and radio technologies not explicitly mentioned herein.

[0040] The network entities 105 may be dispersed throughout a geographic area to form the wireless communications system 100 and may include devices in different forms or having different capabilities. In various examples, a network entity 105 may be referred to as a network element, a mobility element, a radio access network (RAN) node, or network equipment, among other nomenclature. In some examples, network entities 105 and UEs 115 may wirelessly communicate via communication link(s) 125 (e.g., a radio frequency (RF) access link). For example, a network entity 105 may support a coverage area 110 (e.g., a geographic coverage area) over which the UEs 115 and the network entity 105 may establish the communication link(s) 125. The coverage area 110 may be an example of a geographic area over which a network entity 105 and aUE 115 may support the communication of signals according to one or more radio access technologies (RATs).

[0041] The UEs 115 may be dispersed throughout a coverage area 110 of the wireless communications system 100, and each UE 115 may be stationary, or mobile, or both at different times. The UEs 115 may be devices in different forms or having different capabilities. Some example UEs 115 are illustrated in FIG. 1. The UEs 115 described herein may be capable of supporting communications with various types of devices in the wireless communications system 100 (e.g., other wireless communication devices, including UEs 115 or network entities 105), as shown in FIG. 1.

[0042] As described herein, a node of the wireless communications system 100, which may be referred to as a network node, or a wireless node, may be a network entity 105 (e.g., any network entity described herein), a UE 115 (e.g., any UE described herein), a network controller, an apparatus, a device, a computing system, one or more components, or another suitable processing entity configured to perform any of the techniques described herein. For example, a node may be a UE 115. As another example, a node may be a network entity 105. As another example, a first node may be configured to communicate with a second node or a third node. In one aspect of this example, the first node may be a UE 115, the second node may be a network entity 105, and the third node may be a UE 115. In another aspect of this example, the first node may be a UE 115, the second node may be a network entity 105, and the third node may be a network entity 105. In yet other aspects of this example, the first, second, and third nodes may be different relative to these examples. Similarly, reference to a UE 115, network entity 105, apparatus, device, computing system, or the like may include disclosure of the UE 115, network entity 105, apparatus, device, computing system, or the like being a node. For example, disclosure that a UE 115 is configured to receive information from a network entity 105 also discloses that a first node is configured to receive information from a second node.

[0043] In some examples, network entities 105 may communicate with a core network 130, or with one another, or both. For example, network entities 105 may communicate with the core network 130 via backhaul communication link(s) 120 (e.g., in accordance with an SI, N2, N3, or other interface protocol). In some examples, network entities 105 may communicate with one another via backhaul communicationlink(s) 120 (e.g., in accordance with an X2, Xn, or other interface protocol) either directly (e.g., directly between network entities 105) or indirectly (e.g., via the core network 130). In some examples, network entities 105 may communicate with one another via a midhaul communication link 162 (e.g., in accordance with a midhaul interface protocol) or a fronthaul communication link 168 (e.g., in accordance with a fronthaul interface protocol), or any combination thereof. The backhaul communication link(s) 120, midhaul communication links 162, or fronthaul communication links 168 may be or include one or more wired links (e.g., an electrical link, an optical fiber link) or one or more wireless links (e.g., a radio link, a wireless optical link), among other examples or various combinations thereof. A UE 115 may communicate with the core network 130 via a communication link 155.

[0044] One or more of the network entities 105 or network equipment described herein may include or may be referred to as a base station 140 (e.g., a base transceiver station, a radio base station, an NR base station, an access point, a radio transceiver, a NodeB, an eNodeB (eNB), a next-generation NodeB or giga-NodeB (either of which may be referred to as a gNB), a 5GNB, a next-generation eNB (ng-eNB), a Home NodeB, a Home eNodeB, or other suitable terminology). In some examples, a network entity 105 (e.g., a base station 140) may be implemented in an aggregated (e.g., monolithic, standalone) base station architecture, which may be configured to utilize a protocol stack that is physically or logically integrated within one network entity (e.g., a network entity 105 or a single RAN node, such as a base station 140).

[0045] In some examples, a network entity 105 may be implemented in a disaggregated architecture (e.g., a disaggregated base station architecture, a disaggregated RAN architecture), which may be configured to utilize a protocol stack that is physically or logically distributed among multiple network entities (e.g., network entities 105), such as an integrated access and backhaul (IAB) network, an open RAN (O-RAN) (e.g., a network configuration sponsored by the O-RAN Alliance), or a virtualized RAN (vRAN) (e.g., a cloud RAN (C-RAN)). For example, a network entity 105 may include one or more of a central unit (CU), such as a CU 160, a distributed unit (DU), such as a DU 165, a radio unit (RU), such as an RU 170, a RAN Intelligent Controller (RIC), such as an RIC 175 (e.g., a Near-Real Time RIC (Near-RT RIC), a Non-Real Time RIC (Non-RT RIC)), a Service Management and Orchestration (SMO)system, such as an SMO system 180, or any combination thereof. An RU 170 may also be referred to as a radio head, a smart radio head, a remote radio head (RRH), a remote radio unit (RRU), or a transmission reception point (TRP). One or more components of the network entities 105 in a disaggregated RAN architecture may be co-located, or one or more components of the network entities 105 may be located in distributed locations (e.g., separate physical locations). In some examples, one or more of the network entities 105 of a disaggregated RAN architecture may be implemented as virtual units (e.g., a virtual CU (VCU), a virtual DU (VDU), a virtual RU (VRU)).

[0046] The split of functionality between a CU 160, a DU 165, and an RU 170 is flexible and may support different functionalities depending on which functions (e.g., network layer functions, protocol layer functions, baseband functions, RF functions, or any combinations thereof) are performed at a CU 160, a DU 165, or an RU 170. For example, a functional split of a protocol stack may be employed between a CU 160 and a DU 165 such that the CU 160 may support one or more layers of the protocol stack and the DU 165 may support one or more different layers of the protocol stack. In some examples, the CU 160 may host upper protocol layer (e.g., layer 3 (L3), layer 2 (L2)) functionality and signaling (e.g., Radio Resource Control (RRC), service data adaptation protocol (SDAP), Packet Data Convergence Protocol (PDCP)). The CU 160 (e.g., one or more CUs) may be connected to a DU 165 (e.g., one or more DUs) or an RU 170 (e.g., one or more RUs), or some combination thereof, and the DUs 165, RUs 170, or both may host lower protocol layers, such as layer 1 (LI) (e.g., physical (PHY) layer) or L2 (e.g., radio link control (RLC) layer, medium access control (MAC) layer) functionality and signaling, and may each be at least partially controlled by the CU 160. Additionally, or alternatively, a functional split of the protocol stack may be employed between a DU 165 and an RU 170 such that the DU 165 may support one or more layers of the protocol stack and the RU 170 may support one or more different layers of the protocol stack. The DU 165 may support one or multiple different cells (e.g., via one or multiple different RUs, such as an RU 170). In some cases, a functional split between a CU 160 and a DU 165 or between a DU 165 and an RU 170 may be within a protocol layer (e.g., some functions for a protocol layer may be performed by one of a CU 160, a DU 165, or an RU 170, while other functions of the protocol layer are performed by a different one of the CU 160, the DU 165, or the RU 170). A CU 160 may befunctionally split further into CU control plane (CU-CP) and CU user plane (CU-UP) functions. A CU 160 may be connected to a DU 165 via a midhaul communication link 162 (e.g., Fl, Fl-c, Fl-u), and a DU 165 may be connected to an RU 170 via a fronthaul communication link 168 (e.g., open fronthaul (FH) interface). In some examples, a midhaul communication link 162 or a fronthaul communication link 168 may be implemented in accordance with an interface (e.g., a channel) between layers of a protocol stack supported by respective network entities (e.g., one or more of the network entities 105) that are in communication via such communication links.

[0047] In some wireless communications systems (e.g., the wireless communications system 100), infrastructure and spectral resources for radio access may support wireless backhaul link capabilities to supplement wired backhaul connections, providing an IAB network architecture (e.g., to a core network 130). In some cases, in an IAB network, one or more of the network entities 105 (e.g., network entities 105 or IAB node(s) 104) may be partially controlled by each other. The IAB node(s) 104 may be referred to as a donor entity or an IAB donor. A DU 165 or an RU 170 may be partially controlled by a CU 160 associated with a network entity 105 or base station 140 (such as a donor network entity or a donor base station). The one or more donor entities (e.g., IAB donors) may be in communication with one or more additional devices (e.g., IAB node(s) 104) via supported access and backhaul links (e.g., backhaul communication link(s) 120). IAB node(s) 104 may include an IAB mobile termination (IAB-MT) controlled (e.g., scheduled) by one or more DUs (e.g., DUs 165) of a coupled IAB donor. An IAB-MT may be equipped with an independent set of antennas for relay of communications with UEs 115 or may share the same antennas (e.g., of an RU 170) of IAB node(s) 104 used for access via the DU 165 of the IAB node(s) 104 (e.g., referred to as virtual IAB-MT (vIAB-MT)). In some examples, the IAB node(s) 104 may include one or more DUs (e.g., DUs 165) that support communication links with additional entities (e.g., IAB node(s) 104, UEs 115) within the relay chain or configuration of the access network (e.g., downstream). In such cases, one or more components of the disaggregated RAN architecture (e.g., the IAB node(s) 104 or components of the IAB node(s) 104) may be configured to operate according to the techniques described herein.

[0048] In the case of the techniques described herein applied in the context of a disaggregated RAN architecture, one or more components of the disaggregated RAN architecture may be configured to support test as described herein. For example, some operations described as being performed by a UE 115 or a network entity 105 (e.g., a base station 140) may additionally, or alternatively, be performed by one or more components of the disaggregated RAN architecture (e.g., components such as an IAB node, a DU 165, a CU 160, an RU 170, an RIC 175, an SMO system 180).

[0049] A UE 115 may include or may be referred to as a mobile device, a wireless device, a remote device, a handheld device, or a subscriber device, or some other suitable terminology, where the “device” may also be referred to as a unit, a station, a terminal, or a client, among other examples. A UE 115 may also include or may be referred to as a personal electronic device such as a cellular phone, a personal digital assistant (PDA), a tablet computer, a laptop computer, or a personal computer. In some examples, a UE 115 may include or be referred to as a wireless local loop (WLL) station, an Internet of Things (loT) device, an Internet of Everything (loE) device, or a machine type communications (MTC) device, among other examples, which may be implemented in various objects such as appliances, vehicles, or meters, among other examples.

[0050] The UEs 115 described herein may be able to communicate with various types of devices, such as UEs 115 that may sometimes operate as relays, as well as the network entities 105 and the network equipment including macro eNBs or gNBs, small cell eNBs or gNBs, or relay base stations, among other examples, as shown in FIG. 1.

[0051] The UEs 115 and the network entities 105 may wirelessly communicate with one another via the communication link(s) 125 (e.g., one or more access links) using resources associated with one or more carriers. The term “carrier” may refer to a set of RF spectrum resources having a defined PHY layer structure for supporting the communication link(s) 125. For example, a carrier used for the communication link(s) 125 may include a portion of an RF spectrum band (e.g., a bandwidth part (BWP)) that is operated according to one or more PHY layer channels for a given RAT (e.g., LTE, LTE-A, LTE-A Pro, NR). Each PHY layer channel may carry acquisition signaling (e.g., synchronization signals, system information), control signaling that coordinates operation for the carrier, user data, or other signaling. The wireless communicationssystem 100 may support communication with a UE 115 using carrier aggregation or multi-carrier operation. A UE 115 may be configured with multiple downlink component carriers and one or more uplink component carriers according to a carrier aggregation configuration. Carrier aggregation may be used with both frequency division duplexing (FDD) and time division duplexing (TDD) component carriers. Communication between a network entity 105 and other devices may refer to communication between the devices and any portion (e.g., entity, sub-entity) of a network entity 105. For example, the terms “transmitting,” “receiving,” or “communicating,” when referring to a network entity 105, may refer to any portion of a network entity 105 (e.g., a base station 140, a CU 160, a DU 165, a RU 170) of a RAN communicating with another device (e.g., directly or via one or more other network entities, such as one or more of the network entities 105).

[0052] Signal waveforms transmitted via a carrier may be made up of multiple subcarriers (e.g., using multi-carrier modulation (MCM) techniques such as orthogonal frequency division multiplexing (OFDM) or discrete Fourier transform spread OFDM (DFT-S-OFDM)). In a system employing MCM techniques, a resource element may refer to resources of one symbol period (e.g., a duration of one modulation symbol) and one subcarrier, in which case the symbol period and subcarrier spacing may be inversely related. The quantity of bits carried by each resource element may depend on the modulation scheme (e.g., the order of the modulation scheme, the coding rate of the modulation scheme, or both), such that a relatively higher quantity of resource elements (e.g., in a transmission duration) and a relatively higher order of a modulation scheme may correspond to a relatively higher rate of communication. A wireless communications resource may refer to a combination of an RF spectrum resource, a time resource, and a spatial resource (e.g., a spatial layer, a beam), and the use of multiple spatial resources may increase the data rate or data integrity for communications with a UE 115.

[0053] The time intervals for the network entities 105 or the UEs 115 may be expressed in multiples of a basic time unit which may, for example, refer to a sampling period of Ts= l / (A / mflx■ Ay) seconds, for which fmaxmay represent a supported subcarrier spacing, and Ay may represent a supported discrete Fourier transform (DFT) size. Time intervals of a communications resource may be organized according to radioframes each having a specified duration (e.g., 10 milliseconds (ms)). Each radio frame may be identified by a system frame number (SFN) (e.g., ranging from 0 to 1023).

[0054] Each frame may include multiple consecutively-numbered subframes or slots, and each subframe or slot may have the same duration. In some examples, a frame may be divided (e.g., in the time domain) into subframes, and each subframe may be further divided into a quantity of slots. Alternatively, each frame may include a variable quantity of slots, and the quantity of slots may depend on subcarrier spacing. Each slot may include a quantity of symbol periods (e.g., depending on the length of the cyclic prefix prepended to each symbol period). In some wireless communications systems, such as the wireless communications system 100, a slot may further be divided into multiple mini-slots associated with one or more symbols. Excluding the cyclic prefix, each symbol period may be associated with one or more (e.g., Ay) sampling periods. The duration of a symbol period may depend on the subcarrier spacing or frequency band of operation.

[0055] A subframe, a slot, a mini-slot, or a symbol may be the smallest scheduling unit (e.g., in the time domain) of the wireless communications system 100 and may be referred to as a transmission time interval (TTI). In some examples, the TTI duration (e.g., a quantity of symbol periods in a TTI) may be variable. Additionally, or alternatively, the smallest scheduling unit of the wireless communications system 100 may be dynamically selected (e.g., in bursts of shortened TTIs (sTTIs)).

[0056] Physical channels may be multiplexed for communication using a carrier according to various techniques. A physical control channel and a physical data channel may be multiplexed for signaling via a downlink carrier, for example, using one or more of time division multiplexing (TDM) techniques, frequency division multiplexing (FDM) techniques, or hybrid TDM-FDM techniques. A control region (e.g., a control resource set (CORESET)) for a physical control channel may be defined by a set of symbol periods and may extend across the system bandwidth or a subset of the system bandwidth of the carrier. One or more control regions (e.g., CORESETs) may be configured for a set of the UEs 115. For example, one or more of the UEs 115 may monitor or search control regions for control information according to one or more search space sets, and each search space set may include one or multiple control channelcandidates in one or more aggregation levels arranged in a cascaded manner. An aggregation level for a control channel candidate may refer to an amount of control channel resources (e.g., control channel elements (CCEs)) associated with encoded information for a control information format having a given payload size. Search space sets may include common search space sets configured for sending control information to UEs 115 (e.g., one or more UEs) or may include UE-specific search space sets for sending control information to a UE 115 (e.g., a specific UE).

[0057] In some examples, a network entity 105 (e.g., a base station 140, an RU 170) may be movable and therefore provide communication coverage for a moving coverage area, such as the coverage area 110. In some examples, coverage areas 110 (e.g., different coverage areas) associated with different technologies may overlap, but the coverage areas 110 (e.g., different coverage areas) may be supported by the same network entity (e.g., a network entity 105). In some other examples, overlapping coverage areas, such as a coverage area 110, associated with different technologies may be supported by different network entities (e.g., the network entities 105). The wireless communications system 100 may include, for example, a heterogeneous network in which different types of the network entities 105 support communications for coverage areas 110 (e.g., different coverage areas) using the same or different RATs.

[0058] The wireless communications system 100 may be configured to support ultra-reliable communications or low-latency communications, or various combinations thereof. For example, the wireless communications system 100 may be configured to support ultra-reliable low-latency communications (URLLC). The UEs 115 may be designed to support ultra-reliable, low-latency, or critical functions. Ultra-reliable communications may include private communication or group communication and may be supported by one or more services such as push-to-talk, video, or data. Support for ultra-reliable, low-latency functions may include prioritization of services, and such services may be used for public safety or general commercial applications. The terms ultra-reliable, low-latency, and ultra-reliable low-latency may be used interchangeably herein.

[0059] In some examples, a UE 115 may be configured to support communicating directly with other UEs (e.g., one or more of the UEs 115) via a device-to-device (D2D) communication link, such as a D2D communication link 135 (e.g., in accordance with apeer-to-peer (P2P), D2D, or sidelink protocol). In some examples, one or more UEs 115 of a group that are performing D2D communications may be within the coverage area 110 of a network entity 105 (e.g., a base station 140, an RU 170), which may support aspects of such D2D communications being configured by (e.g., scheduled by) the network entity 105. In some examples, one or more UEs 115 of such a group may be outside the coverage area 110 of a network entity 105 or may be otherwise unable to or not configured to receive transmissions from a network entity 105. In some examples, groups of the UEs 115 communicating via D2D communications may support a one-to- many (1 :M) system in which each UE 115 transmits to one or more of the UEs 115 in the group. In some examples, a network entity 105 may facilitate the scheduling of resources for D2D communications. In some other examples, D2D communications may be carried out between the UEs 115 without an involvement of a network entity 105.

[0060] The core network 130 may provide user authentication, access authorization, tracking, Internet Protocol (IP) connectivity, and other access, routing, or mobility functions. The core network 130 may be an evolved packet core (EPC) or 5G core (5GC), which may include at least one control plane entity that manages access and mobility (e.g., a mobility management entity (MME), an access and mobility management function (AMF)) and at least one user plane entity that routes packets or interconnects to external networks (e.g., a serving gateway (S-GW), a Packet Data Network (PDN) gateway (P-GW), or a user plane function (UPF)). The control plane entity may manage non-access stratum (NAS) functions such as mobility, authentication, and bearer management for the UEs 115 served by the network entities 105 (e.g., base stations 140) associated with the core network 130. User IP packets may be transferred through the user plane entity, which may provide IP address allocation as well as other functions. The user plane entity may be connected to IP services 150 for one or more network operators. The IP services 150 may include access to the Internet, Intranet(s), an IP Multimedia Subsystem (IMS), or a Packet-Switched Streaming Service.

[0061] The wireless communications system 100 may operate using one or more frequency bands, which may be in the range of 300 megahertz (MHz) to 300 gigahertz (GHz). Generally, the region from 300 MHz to 3 GHz is known as the ultra-highfrequency (UHF) region or decimeter band because the wavelengths range from approximately one decimeter to one meter in length. UHF waves may be blocked or redirected by buildings and environmental features, which may be referred to as clusters, but the waves may penetrate structures sufficiently for a macro cell to provide service to the UEs 115 located indoors. Communications using UHF waves may be associated with smaller antennas and shorter ranges (e.g., less than one hundred kilometers) compared to communications using the smaller frequencies and longer waves of the high frequency (HF) or very high frequency (VHF) portion of the spectrum below 300 MHz.

[0062] The wireless communications system 100 may utilize both licensed and unlicensed RF spectrum bands. For example, the wireless communications system 100 may employ License Assisted Access (LAA), LTE-Unlicensed (LTE-U) RAT, or NR technology using an unlicensed band such as the 5 GHz industrial, scientific, and medical (ISM) band. While operating using unlicensed RF spectrum bands, devices such as the network entities 105 and the UEs 115 may employ carrier sensing for collision detection and avoidance. In some examples, operations using unlicensed bands may be based on a carrier aggregation configuration in conjunction with component carriers operating using a licensed band (e.g., LAA). Operations using unlicensed spectrum may include downlink transmissions, uplink transmissions, P2P transmissions, or D2D transmissions, among other examples.

[0063] A network entity 105 (e.g., a base station 140, an RU 170) or a UE 115 may be equipped with multiple antennas, which may be used to employ techniques such as transmit diversity, receive diversity, multiple-input multiple-output (MIMO) communications, or beamforming. The antennas of a network entity 105 or a UE 115 may be located within one or more antenna arrays or antenna panels, which may support MIMO operations or transmit or receive beamforming. For example, one or more base station antennas or antenna arrays may be co-located at an antenna assembly, such as an antenna tower. In some examples, antennas or antenna arrays associated with a network entity 105 may be located at diverse geographic locations. A network entity 105 may include an antenna array with a set of rows and columns of antenna ports that the network entity 105 may use to support beamforming of communications with a UE 115. Likewise, a UE 115 may include one or more antenna arrays that may support variousMIMO or beamforming operations. Additionally, or alternatively, an antenna panel may support RF beamforming for a signal transmitted via an antenna port.

[0064] Beamforming, which may also be referred to as spatial filtering, directional transmission, or directional reception, is a signal processing technique that may be used at a transmitting device or a receiving device (e.g., a network entity 105, a UE 115) to shape or steer an antenna beam (e.g., a transmit beam, a receive beam) along a spatial path between the transmitting device and the receiving device. Beamforming may be achieved by combining the signals communicated via antenna elements of an antenna array such that some signals propagating along particular orientations with respect to an antenna array experience constructive interference while others experience destructive interference. The adjustment of signals communicated via the antenna elements may include a transmitting device or a receiving device applying amplitude offsets, phase offsets, or both to signals carried via the antenna elements associated with the device. The adjustments associated with each of the antenna elements may be defined by a beamforming weight set associated with a particular orientation (e.g., with respect to the antenna array of the transmitting device or receiving device, or with respect to some other orientation).

[0065] In some examples, a UE 115 and a network entity 105 may support communication of a PTRS to support phase noise cancellation for data transmitted along with the PTRS. The network entity 105 may transmit control signaling to the UE 115 indicating a type associated with a PTRS waveform. The PTRS waveform (e.g., a type of the PTRS waveform) may be based on a capability of the UE 115. In some examples, the network entity 105 may transmit the PTRS waveform to the UE 115 including a single pilot tone (e.g., with a non-zero amplitude) surrounded by zero-amplitude tones based on a capability of the UE 115. The network entity 105 may transmit the single pilot PTRS waveform with a boosted transmission power (e.g., the non-zero amplitude pilot tone may be transmitted at a higher transmission power level). Additionally, the network entity 105 may indicate a size of the PTRS waveform, a location of the pilot tone relative to the zero-amplitude tones, and locations of the pilot tone and the zeroamplitude tones within a wireless channel. The UE 115 may select a phase noise estimation algorithm based on the capability of the UE 115 and the indication and may estimate a phase noise in accordance with the selected algorithm.

[0066] FIG. 2 shows an example of a wireless communications system 200 that supports phase noise cancellation using a single pilot phase noise tracking reference signal in accordance with one or more aspects of the present disclosure. In some examples, the wireless communications system 200 may include a UE 115-a in communications with a network entity 105-a, which may be examples of corresponding devices as described herein, including with reference to FIG. 1. The UE 115-a and the network entity 105-a may communicate signaling via a wireless channel 205. In some examples, the UE 115-a and the network entity 105-b may implement quadrature amplitude modulation (QAM) for signals communicated between the UE 115-a and the network entity 105-b. For example, the UE 115-a and the network entity 105-a may modulate and demodulate signals in accordance with OFDM techniques.

[0067] In the example of FIG. 2, the UE 115-a may include an OFDM modulator 210, a local oscillator 215-a, and an up-converter 220, and the network entity 105-a may include an OFDM demodulator 225, a local oscillator 215-b, and a down-converter 230. Although the wireless communications system illustrates the UE 115-a as including the OFDM modulator 210 and the up-converter 220, it is to be understood that the UE 115-a may also include an OFDM demodulator 225 (not shown) and a down-converter 230 (not shown). Similarly, although the wireless communications system illustrates the network entity 105-a as including the OFDM demodulator 225 and the down-converter 230, it is to be understood that the network entity 105-a may also include an OFDM modulator 210 (not shown) and an up-converter 220 (not shown).

[0068] In some examples, the modulation scheme used by the UE 115-a and the network entity 105-a may be limited by the presence of radio-frequency (RF) noise floors in the wireless communications system 200. For example, the modulation scheme may be impacted significantly by phase noise (e.g., a phase noise floor) generated by the local oscillators 215 (e.g., the local oscillator 215-a and the local oscillator 215-b). In such examples, even if signals within the wireless communications system 200 were transmitted with an infinite thermal signal-to-noise ratio (SNR), a net available SNR for the wireless communications system may be capped (e.g., limited, restricted) to the phase noise floor. Accordingly, reducing a level of the phase noise floor may allow for an increased modulation order, which may support increased throughput for signaling between the UE 115-a and the network entity 105-a.

[0069] To reduce the phase noise present in the wireless communications system 200, the UE 115-a and the network entity 105-a may support communication of phase noise tracking reference signal (PTRS) waveforms. A PTRS waveform may include one or more pilot tones (e.g., a signal transmitted via a subcarrier in a resource element) that the UE 115-a may use to estimate and cancel the phase noise. The UE 115-a may select an estimation algorithm in accordance with a type of the PTRS waveform and may estimate and cancel the phase noise using the selected estimation algorithm. Examples of different types of PTRS waveforms and estimation algorithms are provided in more detail herein with respect to FIGs. 3 A, 3B, and 4. In some implementations as described herein, the UE 115-a and the network entity 105-a may support communication of PTRS waveforms that include a single pilot tone (e.g., having non -zero amplitude) surrounded by zero amplitude tones (e.g., without any transmission power and thus only contain noise). The UE 115-a may select an estimation algorithm in accordance with the PTRS waveform that includes the single pilot tone and may estimate and correct (e.g., reduce) the phase noise.

[0070] FIGs. 3A and 3B show examples of PTRS waveform 300-a and PTRS waveform 300-b that support phase noise cancellation using a single pilot phase noise tracking reference signal in accordance with one or more aspects of the present disclosure. In some examples, PTRS waveform 300-a and PTRS waveform 300-b may implement aspects of the wireless communications system 100 and the wireless communications system 200. For example, a UE (not shown) and a network entity (not shown) may communicate signaling in accordance with the PTRS waveform 300-a, the PTRS waveform 300-b, or both.

[0071] PTRS waveform 300 may be transmitted over a wireless channel 305 that includes pilot tones 310 and data 315. The UE may receive the pilot tones 310 and the data 315 during a TTI 320 (e.g., one or more symbol periods, a slot, a subframe, etc.). Specifically, PTRS waveform 300-a may be transmitted within a wireless channel 305 that includes multiple pilot tones 310 interspersed between data 315 (e.g., continuous chunks of data constellation symbols), and PTRS waveform 300-b may be transmitted within a wireless channel 305 that includes multiple consecutive pilot tones 310 (e.g., in a first portion of the channel 305) separated from the data 315 (e.g., in a second portion of the channel 305). The data 315 may be comprised of one or more data tones (notshown) that may correspond to a set of subcarriers. Each of the pilot tones 310 and each of the data tones of the data 315 may be communicated via a respective resource element 325. In some examples, the tones of the PTRS waveform 300 (e.g., the pilot tones 310 and the data tones of the data 315) may be the same duration in time as a TTI (e.g., symbol). In some other examples, the tones of the PTRS waveform 300 may be a longer duration in time or a shorter duration in time than a TTI (e.g., a symbol).

[0072] In some implementations, the received signal phase noise may be modeled in the time domain according to Equation 1.

[0073] ynmay represent the received signal in the time domain, xnmay represent the transmitted signal in the time domain, hnmay represent a time-domain version of the wireless channel 305, and e70nmay represent the phase noise process in the time domain. In some cases, 0nmay be represented as a vector, as shown in Equation 2.0n= an^Ze( / (0))

[0074] In some examples, the phase noise imposed on the transmitted signal in the time domain may be a multiplicative process and may be equivalent to a frequencydomain cyclic convolution of the phase noise process with the received signal.

[0075] In the example of FIG. 3 A where each pilot tone 310 within the wireless channel 305 is surrounded by data 315, the received resource element 325 of each pilot tone 310 may be contaminated by a symbol of the data 315 (data tones that comprise the data 315). For example, a symbol of the data 315 may leak into a pilot tone 310 through convolution. In such examples, the UE may only estimate a central tap / (0) of the phase noise mask using a least squares method according to Equation 3.

[0076] y( / pi) may represent the received signal, X(p.) may represent the known pilot tones 310, and H fPimay represent the channel. The central tap / (0) of the phasenoise mask may represent a common phase error (CPE) term of the overall phase noise. The UE may not be able to estimate other taps of the phase noise mask due to contamination from the data 315, which may limit the degree to which the UE is able to correct the overall phase noise when compared to other phase noise estimation methods (e.g., methods that estimate more phase noise mask taps).

[0077] In the example of FIG. 3B where the pilot tones 310 and the data 315 are in different bandwidths of the wireless channel 305, pilot tones 310 that are closer to the data 315 may experience more contamination due to convolution relative to pilot tones 310 that are further from the data 315. In such examples, the phase noise model can be described in the frequency domain according to Equation 4, which may be simplified into Equation 5.

[0078] {y lo1-1may represent the received signal, {X} |r_rmay represent the known pilot tones 310, {H} \r_rmay represent the channel, { / } \r_rmay represent the frequencydomain phase noise mask coefficients, ICI may represent inter-carrier interference, and N may represent additional noise present in the wireless communications system. A may be a matrix representative of a product of {X} \r_rand {H} \r_r. The UE may implement a phase noise algorithm to estimate the noise mask coefficients. For example, the UE may estimate the phase noise I using a linear minimum mean squared error method according to Equation 6

[0079] 0^1 may represent a variance in the observed noise, which may be equal to a noise power. In some other cases, the UE may estimate the phase noise I using a least squares method according to Equation 7.I = AHA')~1AHy <7)

[0080] To estimate the phase noise / , the UE may perform a matrix inversion operation on the (AHA + <J^ / ) matrix as described with reference to Equation 5, or the (AHA) matrix as described with reference to Equation 6. However, the matrix inversion operation may be significantly complex (e.g., computationally demanding), which may increase latency associated with phase noise estimation operations at the UE. For example, the complexity of the matrix inversion operation may be based on a size of the (AHA + <J^ / ) matrix as described with reference to Equation 5, or the (AHA~) matrix as described with reference to Equation 6. In the example of FIG. 3B, the PTRS waveform 300-b including multiple consecutive pilot tones 310 may be associated with a large matrix based on a quantity of the multiple consecutive pilot tones.

[0081] FIG. 4 shows an example of a channel diagram 400 that supports phase noise cancellation using a single pilot phase noise tracking reference signal in accordance with one or more aspects of the present disclosure. In some examples, the channel diagram 400 may implement aspects of the wireless communications system 100 and the wireless communications system 200. For example, a UE (not shown) and a network entity (not shown) may communicate signaling via a wireless channel 405 in accordance with the channel diagram 400. In the example of FIG. 4, the UE and the network entity may communicate a PTRS waveform 410 (e.g., the PTRS waveform 410-a, the PTRS waveform 410-b) and data 415 via the wireless channel 405.

[0082] The UE may transmit a capability message to the network entity indicating whether the UE supports a single pilot tone scheme for phase noise cancellation. For example, the UE may indicate that it supports single-pilot based phase noise estimation, or that it supports other pilot tone schemes for phase noise cancellation as describedwith reference to FIGs. 3 A and 3B. The UE may transmit the capability message to the network entity via MAC control element (CE) signaling upon attachment to the network entity (e.g., at the beginning of communications between the UE and the network entity). The network entity may configure the PTRS waveform 410 based on the capability message and a policy associated with the network entity. In some examples, the network entity may determine the policy based on one or more parameters (e.g., requirements) for a cell associated with the network entity.

[0083] If the UE indicates in the capability message that it supports the single pilot tone scheme for phase noise cancellation, the network entity may configure the PTRS waveform 410 in accordance with the channel diagram 400 as described herein. For example, the network entity may configure the PTRS waveform 410 such that the PTRS waveform 410 includes a single pilot tone 420 (e.g., a non-zero amplitude PTRS tone) surrounded by zero tones 425 (e.g., zero-amplitude tones). For example, the PTRS waveform 410 may be configured such that both higher and lower frequencies neighboring the single pilot tone 410 may be occupied by the zero tones 425. A zero tone 425 may refer to a subcarrier on which the UE does not transmit data or otherwise output a signal that includes data or other information. In some examples, the zero tones 425 may represent (e.g., comprise) a guard bandwidth relative to the pilot tone 420 of the PTRS waveform 410. Otherwise, if the UE indicates in the capability message that it does not support the single pilot tone scheme, the network entity may configure the PTRS waveform 410 in accordance with the examples described herein with respect to FIGs. 3 A and 3B.

[0084] For example, if the UE indicates that it supports the single pilot tone scheme for phase noise cancellation, the UE may receive the PTRS waveform 410 (including the single pilot tone 420 and the zero tones 425) via the wireless channel 405. The wireless channel 405 may include one or more subchannels, including a first subchannel 430 (e.g., the first subchannel 430-a, the first subchannel 430-b), a second subchannel 435, and, in some examples, a third subchannel 440. The UE may receive the PTRS waveform 410 via the first subchannel 430 (e.g., the first subchannel 430-a, the first subchannel 430-b). and may receive the data 415 via the second subchannel 435. Alternatively, in some examples, the UE may receive the data 415 via the second subchannel 435 and the third subchannel 440. The UE may receive the PTRS waveform410 and the data 415 via the wireless channel 405 during a TTI 445 (e.g., a symbol period). The data 415 may be comprised of multiple data tones (not shown). Each of the single pilot tone 420, zero tones 425, and data tones of the data 415 may be communicated via a respective resource element 450. In some examples, the tones of the PTRS waveform 410 (e.g., the single pilot tone 420 and the zero tones 425) may be the same duration in time as a TTI (e.g., symbol). In some other examples, the tones of the PTRS waveform 410 may be a longer duration in time or a shorter duration in time than a TTI (e.g., symbol).

[0085] Additionally, the network entity may configure a bandwidth of the PTRS waveform 410. In some examples, the network entity may configure the PTRS waveform 410-a (e.g., a bandwidth size of the PTRS waveform 410-a, a location of the PTRS pilot tone 420 within the first subchannel 430-a) such that the PTRS waveform 410-a spans a bandwidth within the first subchannel 430-a. Similarly, in some other examples, the network entity may configure the PTRS waveform 410-b within the first subchannel 430-b such that the PTRS waveform 410-b spans a bandwidth within the first subchannel 430-b. In some cases, the bandwidth of the PTRS waveform 410-b may be larger than the bandwidth of the PTRS waveform 410-a. Though not explicitly illustrated, it should be known that in other examples, the bandwidth of the PTRS waveform 410-b may be smaller than, or the same as, the bandwidth of the PTRS waveform 410-a. The network entity may determine the bandwidth of the PTRS waveform 410 (e.g., bandwidth of subchannel 430) based on a phase noise suppression level configured at the network entity, one or more overhead restrictions at the network entity, one or more multi-user (MU) system requirements associated with the UE and the network entity, or any combination thereof.

[0086] The network entity may also configure a location of the single pilot tone 420 within the PTRS waveform 410 (e.g., within the zero tones 425), a location of the PTRS waveform 410 within the wireless channel 405 (e.g., location of the first subchannel 430-a within the channel 405), or both. In some examples, the network entity may configure the PTRS waveform 410-a such that the single pilot tone 420 is in the middle of the zero tones 425 of the PTRS waveform 410-a. Alternatively, the network entity may configure the PTRS waveform 410-b such that the single pilot tone 420 is not in the middle (e.g., offset from the middle) of the zero tones 425 of the PTRS waveform410-b. Similarly, in some examples, the network entity may configure the PTRS waveform 410-a (e.g., a bandwidth of the first subchannel 430-a) such that the zero tones 425 are separated from the data 415. Alternatively, the network entity may configure the PTRS waveform 410-b (e.g., a bandwidth of the first subchannel 430-b) such that the zero tones 425 are surrounded by the data 415. In such examples where the zero tones 425 are surrounded by the data 415, the network entity and the UE may communicate the data via the second subchannel 435 and the third subchannel 440.

[0087] The network entity may transmit control signaling to the UE indicating the configuration for the PTRS waveform 410. In some examples, the control signaling may indicate whether the PTRS waveform 410 includes a single pilot tone 420 (e.g., nonzero amplitude pilot) surrounded by zero tones 425. The network entity may also include additional information about the PTRS waveform 410 in the control signaling, including the bandwidth (e.g., size) of the PTRS waveform 410, the location of the single pilot tone 420 within the zero tones 425 of the PTRS waveform 410, the location of the PTRS waveform 410 within the wireless channel 405 (e.g. location of subchannel 430-a or 430-b within channel 405), or any combination thereof, in the control signaling. For example, the network entity may indicate the configuration via physicallayer signaling (e.g., via a physical downlink control channel (PDCCH) as a part of downlink control information (DCI)). In some cases, the network entity may update the configuration for the PTRS waveform 410 based on one or more temporary conditions at the network entity. In such cases, the network entity may update the control signaling to indicate the updated configuration for the PTRS waveform 410.

[0088] Upon receiving the control signaling from the network entity indicating the configuration for the PTRS waveform 410, the UE may estimate and correct the phase noise. The UE may select an estimation algorithm that fits the format of the PTRS waveform 410 based on the control signaling and the capability of the UE to support the single pilot tone scheme. For example, the UE may select a single-pilot pattern algorithm to estimate the PTRS waveform 410.

[0089] In the example of FIG. 4 where the single pilot tone 420 is transmitted within a region of zero tones 425 (e.g., within the PTRS waveform 410-a or the PTRS waveform 410-b), the network entity may boost (e.g., increase) a transmission power of the single pilot tone 420. The zero tones 425 may allow the network entity to boost thetransmission power of the single pilot tone 420 (e.g., boost the amplitude) while preserving a total power of the PTRS waveform 410. Assuming a quantity of N — 1 zero tones 425 surrounding the single pilot tone 420 (where N is a positive integer) , the network entity may boost the transmission power of the single pilot tone 420 by a factor of b according to Equation 8 b = 10 log10N (8)

[0090] Transmitting the PTRS waveform 410 with increased pilot transmission power may reduce a phase noise estimation error at the UE. In the example of FIG. 4 where the single pilot tone 420 is isolated from the data 415 by the zero tones 425, the single pilot tone 420 may experience reduced or minimal leaking (e.g., contamination) from the data 415. Additionally, the single pilot tone 420 may have a high SNR, which may allow for strong estimation of a large portion of the phase noise mask. In some examples, the phase noise imposed on the transmitted signal in the time domain may be a multiplicative process and may be equivalent to a frequency-domain cyclic convolution of the phase noise process with the received signal. The phase noise model can be described in the frequency domain according to Equation 9, which may be simplified into Equation 10.

[0091] {y}|or maY represent the received signal, b may represent the transmission power boosting factor, {A} |r_rmay represent the known single pilot tone 420, {H} \r_rmay represent the channel, { / } |r_rmay represent the frequency-domain phase noise mask coefficients, ICI may represent inter-carrier interference, and N may represent additional noise. The product of {X} \r_rand {H} \r_rmay be represented by a matrix A.In the example of FIG. 4, the A matrix may be a diagonal matrix. Accordingly, Equation 9 may be reduced into Equation 11.

[0092] X(r) may represent the channel over an observed resource element 450 r, and H (r) may represent the channel over the observed resource element 450 r. In the example of FIG. 4, the UE may use less channel information to estimate the phase noise. For example, the UE may estimate the phase noise mask only using a channel over an observed resource element 450 H (r) (e.g., over one resource element 450). As described herein, the UE may implement a phase noise algorithm to estimate the phase noise mask coefficients. In the example of FIG. 4, the UE may estimate the phase noise mask coefficients { / } \r_raccording to Equation 9, which has been reorganized into Equation 12.

[0093] In the example of FIG. 4, when estimating the phase noise mask coefficients { / } \r_r, the UE may be able to skip performing matrix inversion (e.g., in accordance with Equation 5, Equation 6, or both, as described with reference to FIGs. 3 A and 3B), but instead may perform a scalar division operation in accordance with Equation 10. For example, to estimate the phase noise mask coefficients { / } \r_r, the UE may divide each {y)lormeasurement by * X(r)H (r). Such a scalar division operation may be less computationally demanding compared to the matrix inversion operation, which may reduce latency associated with estimating the phase noise.

[0094] The UE may demodulate the data 415 in accordance with a modulation scheme. In some examples, as described herein with reference to FIG. 2, the modulation scheme may be based on the phase noise. In the example of FIG. 4, the UE may estimate and correct (e.g., reduce) the phase noise in accordance with the selected phase noise estimation algorithm. The UE may implement an algorithm to remove (e.g., cancel) the phase noise from the signal. Reducing the phase noise may allow for an increased modulation order, which may improve signaling throughput (e.g., of data 415)between the UE and the network entity. For example, the UE may determine an amount of amplitude and phase of noise based the PTRS waveform, and may perform a phase noise cancellation operation to cancel out a corresponding amount of amplitude and phase of noise from a signal carrying the data 415 For example, the UE may transform the signaling received over the wireless channel 405 (e.g., using a Fast Fourier transform) to determine one or more subcarriers used to carry the data 415. The UE may nullify the one or more subcarriers carrying the data 415 and may transform the signaling (e.g., using an Inverse Fast Fourier transform) to isolate the phase noise.

[0095] FIG. 5 shows an example of a process flow 500 that supports phase noise cancellation using a single pilot phase noise tracking reference signal in accordance with one or more aspects of the present disclosure. The process flow 500 may implement or be implemented by aspects of the wireless communications system 100, the wireless communications system 200, and the channel diagram 400, as described with reference to FIGs. 1, 2, and 4. For example, the process flow 500 illustrates actions performed by a UE 115-b and a network entity 105-b, which may be examples of corresponding devices described herein, including with reference to FIG. 1 or FIG. 2. In the following description of the process flow 500, the operations between the UE 115-b and the network entity 105-b may be performed in a different order than the example shown, or the operations between the UE 115-b and the network entity 105-b may be performed in different orders at different times. Some operations may also be omitted from the process flow 500, and other operations may be added to the process flow 500.

[0096] At 505, the UE 115-b may transmit, to the network entity 105-b, a capability message indicating that the UE 115-b supports a single pilot tone scheme for phase noise cancellation. In some examples, the UE 115-b may transmit the capability message indicating that the UE 115-b supports the single pilot tone scheme for phase noise cancellation via a MAC-CE.

[0097] At 510, the UE 115-b may receive, from the network entity 105-b, control signaling indicating a configuration of a PTRS waveform based on the capability message. The configuration may indicate that the PTRS waveform includes a single pilot tone surrounded by a plurality of zero-amplitude tones within a TTI. In some examples, the network entity 105-b may transmit DCI indicating the configuration for the PTRS waveform.

[0098] In some examples, the UE 115-b may receive a control message indicating the configuration that identifies one or more parameters associated with the PTRS waveform, the one or more parameters comprising a bandwidth of the PTRS waveform (e.g., bandwidth of subchannel 430), a location of the bandwidth of the PTRS waveform within a channel (e.g., location of subchannel 430 within channel 405), a location of the single pilot tone within the bandwidth of the PTRS waveform, or any combination thereof. Additionally, or alternatively, the UE 115-b may receive a control message that indicates a channel comprising a subchannel for the PTRS waveform and a second subchannel for a data message.

[0099] At 515, the UE 115-b may receive, within the TTI, the PTRS waveform in accordance with the configuration. In some examples, the network entity 105-b may output the PTRS waveform during the TTI. In such examples, the network entity 105-b may output the single pilot tone at a first transmit power level that exceeds a second transmit power level of the data message. At 520, the UE 115-b may receive, within the TTI, the data message based on a phase noise cancellation operation performed using the PTRS waveform. In some examples, the network entity 105-b may output the data message during the TTI.

[0100] At 525, the UE 115-b may estimate phase noise associated with a signal comprising the data message based on the PTRS waveform. In some examples, the UE 115-b may estimate the phase noise in accordance with (e.g., using) a phase noise estimation algorithm. The UE 115-b may select the phase noise estimation algorithm based on the capability of the UE and in accordance with a type associated with the PTRS waveform. For example, the UE 115-b may estimate the phase noise of the PTRS waveform in accordance with the configuration indicating that the PTRS waveform includes the single pilot tone surrounded by the plurality of zero-amplitude tones within the TTI. At 530, the UE 115-b may demodulate the data message using the estimated phase noise of the phase noise cancellation operation (e.g., the phase noise estimation algorithm). For example, with reference to FIG. 4, the UE 115-b may perform phase noise estimation using the PTRS waveform received in subchannel 430 for demodulating data communicated via subchannel 435 and / or 440.

[0101] In some examples, the network entity 105-b may update the configuration of the PTRS waveform. In such examples, network entity 105-b may update theconfiguration based on one or more temporary conditions (e.g., temporary requirements) at the network entity 105-b and may indicate the updated configuration to the UE 115-b. For example, at 535, the UE 115-b may receive an indication of an updated configuration for the PTRS waveform. In some examples, the network entity 105-b may output control signaling indicating the updated configuration to the UE 115-b. The network entity 105-b may include the updated configuration in DCI.

[0102] At 540, the UE 115-b may receive, within a second TTI, a second PTRS waveform in accordance with the updated configuration. In some examples, the network entity 105-b may output the second PTRS waveform within the second TTI. At 545, the UE 115-b may receive, within the second TTI, a second data message based at least in part on a second phase noise cancellation operation performed using the second PTRS waveform. In some examples, the network entity 105-b may output the second data message within the second TTI.

[0103] FIG. 6 shows a block diagram 600 of a device 605 that supports phase noise cancellation using a single pilot phase noise tracking reference signal in accordance with one or more aspects of the present disclosure. The device 605 may be an example of aspects of a UE 115 as described herein. The device 605 may include a receiver 610, a transmitter 615, and a communications manager 620. The device 605, or one or more components of the device 605 (e.g., the receiver 610, the transmitter 615, the communications manager 620), may include at least one processor, which may be coupled with at least one memory, to, individually or collectively, support or enable the described techniques. Each of these components may be in communication with one another (e.g., via one or more buses).

[0104] The receiver 610 may provide a means for receiving information such as packets, user data, control information, or any combination thereof associated with various information channels (e.g., control channels, data channels, information channels related to phase noise cancellation using a single pilot phase noise tracking reference signal). Information may be passed on to other components of the device 605. The receiver 610 may utilize a single antenna or a set of multiple antennas.

[0105] The transmitter 615 may provide a means for transmitting signals generated by other components of the device 605. For example, the transmitter 615 may transmitinformation such as packets, user data, control information, or any combination thereof associated with various information channels (e.g., control channels, data channels, information channels related to phase noise cancellation using a single pilot phase noise tracking reference signal). In some examples, the transmitter 615 may be co-located with a receiver 610 in a transceiver module. The transmitter 615 may utilize a single antenna or a set of multiple antennas.

[0106] The communications manager 620, the receiver 610, the transmitter 615, or various combinations or components thereof may be examples of means for performing various aspects of phase noise cancellation using a single pilot phase noise tracking reference signal as described herein. For example, the communications manager 620, the receiver 610, the transmitter 615, or various combinations or components thereof may be capable of performing one or more of the functions described herein.

[0107] In some examples, the communications manager 620, the receiver 610, the transmitter 615, or various combinations or components thereof may be implemented in hardware (e.g., in communications management circuitry). The hardware may include at least one of a processor, a digital signal processor (DSP), a central processing unit (CPU), an application-specific integrated circuit (ASIC), a field-programmable gate array (FPGA) or other programmable logic device, a microcontroller, discrete gate or transistor logic, discrete hardware components, or any combination thereof configured as or otherwise supporting, individually or collectively, a means for performing the functions described in the present disclosure. In some examples, at least one processor and at least one memory coupled with the at least one processor may be configured to perform one or more of the functions described herein (e.g., by one or more processors, individually or collectively, executing instructions stored in the at least one memory).

[0108] Additionally, or alternatively, the communications manager 620, the receiver 610, the transmitter 615, or various combinations or components thereof may be implemented in code (e.g., as communications management software or firmware) executed by at least one processor (e.g., referred to as a processor-executable code). If implemented in code executed by at least one processor, the functions of the communications manager 620, the receiver 610, the transmitter 615, or various combinations or components thereof may be performed by a general-purpose processor, a DSP, a CPU, an ASIC, an FPGA, a microcontroller, or any combination of these orother programmable logic devices (e.g., configured as or otherwise supporting, individually or collectively, a means for performing the functions described in the present disclosure).

[0109] In some examples, the communications manager 620 may be configured to perform various operations (e.g., receiving, obtaining, monitoring, outputting, transmitting) using or otherwise in cooperation with the receiver 610, the transmitter 615, or both. For example, the communications manager 620 may receive information from the receiver 610, send information to the transmitter 615, or be integrated in combination with the receiver 610, the transmitter 615, or both to obtain information, output information, or perform various other operations as described herein.

[0110] The communications manager 620 may support wireless communications in accordance with examples as disclosed herein. For example, the communications manager 620 is capable of, configured to, or operable to support a means for transmitting, to a network entity, a capability message indicating that the UE supports a single pilot tone scheme for phase noise cancellation. The communications manager 620 is capable of, configured to, or operable to support a means for receiving, from the network entity, control signaling indicating a configuration of a PTRS waveform based on the capability message, where the configuration indicates that the PTRS waveform includes a single pilot tone surrounded by a set of multiple zero-amplitude tones within a TTI. The communications manager 620 is capable of, configured to, or operable to support a means for receiving, within the TTI, the PTRS waveform in accordance with the configuration. The communications manager 620 is capable of, configured to, or operable to support a means for receiving, within the TTI, a data message based on a phase noise cancellation operation performed using the PTRS waveform.

[0111] By including or configuring the communications manager 620 in accordance with examples as described herein, the device 605 (e.g., at least one processor controlling or otherwise coupled with the receiver 610, the transmitter 615, the communications manager 620, or a combination thereof) may support techniques for reduced processing.

[0112] FIG. 7 shows a block diagram 700 of a device 705 that supports phase noise cancellation using a single pilot phase noise tracking reference signal in accordancewith one or more aspects of the present disclosure. The device 705 may be an example of aspects of a device 605 or a UE 115 as described herein. The device 705 may include a receiver 710, a transmitter 715, and a communications manager 720. The device 705, or one or more components of the device 705 (e.g., the receiver 710, the transmitter 715, the communications manager 720), may include at least one processor, which may be coupled with at least one memory, to support the described techniques. Each of these components may be in communication with one another (e.g., via one or more buses).

[0113] The receiver 710 may provide a means for receiving information such as packets, user data, control information, or any combination thereof associated with various information channels (e.g., control channels, data channels, information channels related to phase noise cancellation using a single pilot phase noise tracking reference signal). Information may be passed on to other components of the device 705. The receiver 710 may utilize a single antenna or a set of multiple antennas.

[0114] The transmitter 715 may provide a means for transmitting signals generated by other components of the device 705. For example, the transmitter 715 may transmit information such as packets, user data, control information, or any combination thereof associated with various information channels (e.g., control channels, data channels, information channels related to phase noise cancellation using a single pilot phase noise tracking reference signal). In some examples, the transmitter 715 may be co-located with a receiver 710 in a transceiver module. The transmitter 715 may utilize a single antenna or a set of multiple antennas.

[0115] The device 705, or various components thereof, may be an example of means for performing various aspects of phase noise cancellation using a single pilot phase noise tracking reference signal as described herein. For example, the communications manager 720 may include a capability message component 725, a control signaling component 730, an PTRS waveform component 735, a data message component 740, or any combination thereof. The communications manager 720 may be an example of aspects of a communications manager 620 as described herein. In some examples, the communications manager 720, or various components thereof, may be configured to perform various operations (e.g., receiving, obtaining, monitoring, outputting, transmitting) using or otherwise in cooperation with the receiver 710, the transmitter 715, or both. For example, the communications manager 720 may receiveinformation from the receiver 710, send information to the transmitter 715, or be integrated in combination with the receiver 710, the transmitter 715, or both to obtain information, output information, or perform various other operations as described herein.

[0116] The communications manager 720 may support wireless communications in accordance with examples as disclosed herein. The capability message component 725 is capable of, configured to, or operable to support a means for transmitting, to a network entity, a capability message indicating that the UE supports a single pilot tone scheme for phase noise cancellation. The control signaling component 730 is capable of, configured to, or operable to support a means for receiving, from the network entity, control signaling indicating a configuration of a PTRS waveform based on the capability message, where the configuration indicates that the PTRS waveform includes a single pilot tone surrounded by a set of multiple zero-amplitude tones within a TTI. The PTRS waveform component 735 is capable of, configured to, or operable to support a means for receiving, within the TTI, the PTRS waveform in accordance with the configuration. The data message component 740 is capable of, configured to, or operable to support a means for receiving, within the TTI, a data message based on a phase noise cancellation operation performed using the PTRS waveform.

[0117] FIG. 8 shows a block diagram 800 of a communications manager 820 that supports phase noise cancellation using a single pilot phase noise tracking reference signal in accordance with one or more aspects of the present disclosure. The communications manager 820 may be an example of aspects of a communications manager 620, a communications manager 720, or both, as described herein. The communications manager 820, or various components thereof, may be an example of means for performing various aspects of phase noise cancellation using a single pilot phase noise tracking reference signal as described herein. For example, the communications manager 820 may include a capability message component 825, a control signaling component 830, an PTRS waveform component 835, a data message component 840, a waveform configuration component 845, a demodulation component 850, a phase noise cancellation component 855, or any combination thereof. Each of these components, or components or subcomponents thereof (e.g., one or moreprocessors, one or more memories), may communicate, directly or indirectly, with one another (e.g., via one or more buses).

[0118] The communications manager 820 may support wireless communications in accordance with examples as disclosed herein. The capability message component 825 is capable of, configured to, or operable to support a means for transmitting, to a network entity, a capability message indicating that the UE supports a single pilot tone scheme for phase noise cancellation. The control signaling component 830 is capable of, configured to, or operable to support a means for receiving, from the network entity, control signaling indicating a configuration of a PTRS waveform based on the capability message, where the configuration indicates that the PTRS waveform includes a single pilot tone surrounded by a set of multiple zero-amplitude tones within a TTI. The PTRS waveform component 835 is capable of, configured to, or operable to support a means for receiving, within the TTI, the PTRS waveform in accordance with the configuration. The data message component 840 is capable of, configured to, or operable to support a means for receiving, within the TTI, a data message based on a phase noise cancellation operation performed using the PTRS waveform.

[0119] In some examples, to support receiving the control signaling, the control signaling component 830 is capable of, configured to, or operable to support a means for receiving a control message indicating the configuration that identifies one or more parameters associated with the PTRS waveform, the one or more parameters including a bandwidth of the PTRS waveform, a location of the bandwidth of the PTRS waveform within a channel, a location of the single pilot tone within the bandwidth of the PTRS waveform, or any combination thereof.

[0120] In some examples, to support receiving the control signaling, the control signaling component 830 is capable of, configured to, or operable to support a means for receiving a control message that indicates a channel including a subchannel for the PTRS waveform and a second subchannel for the data message.

[0121] In some examples, the waveform configuration component 845 is capable of, configured to, or operable to support a means for receiving an indication of an updated configuration for the PTRS waveform. In some examples, the PTRS waveform component 835 is capable of, configured to, or operable to support a means forreceiving, within a second TTI, a second PTRS waveform in accordance with the updated configuration. In some examples, the data message component 840 is capable of, configured to, or operable to support a means for receiving, within the second TTI, a second data message based on a second phase noise cancellation operation performed using the second PTRS waveform.

[0122] In some examples, the demodulation component 850 is capable of, configured to, or operable to support a means for demodulating the data message using an estimated phase noise of the phase noise cancellation operation.

[0123] In some examples, the phase noise cancellation component 855 is capable of, configured to, or operable to support a means for estimating phase noise associated with a signal including the data message based on the PTRS waveform.

[0124] In some examples, to support transmitting the capability message, the capability message component 825 is capable of, configured to, or operable to support a means for transmitting a MAC-CE indicating that the UE supports the single pilot tone scheme for phase noise cancellation.

[0125] FIG. 9 shows a diagram of a system 900 including a device 905 that supports phase noise cancellation using a single pilot phase noise tracking reference signal in accordance with one or more aspects of the present disclosure. The device 905 may be an example of or include components of a device 605, a device 705, or a UE 115 as described herein. The device 905 may communicate (e.g., wirelessly) with one or more other devices (e.g., network entities 105, UEs 115, or a combination thereof). The device 905 may include components for bi-directional voice and data communications including components for transmitting and receiving communications, such as a communications manager 920, an input / output (I / O) controller, such as an I / O controller 910, a transceiver 915, one or more antennas 925, at least one memory 930, code 935, and at least one processor 940. These components may be in electronic communication or otherwise coupled (e.g., operatively, communicatively, functionally, electronically, electrically) via one or more buses (e.g., a bus 945).

[0126] The I / O controller 910 may manage input and output signals for the device 905. The I / O controller 910 may also manage peripherals not integrated into the device 905. In some cases, the I / O controller 910 may represent a physical connection or portto an external peripheral. In some cases, the I / O controller 910 may utilize an operating system such as iOS®, ANDROID®, MS-DOS®, MS-WINDOWS®, OS / 2®, UNIX®, LINUX®, or another known operating system. Additionally, or alternatively, the I / O controller 910 may represent or interact with a modem, a keyboard, a mouse, a touchscreen, or a similar device. In some cases, the I / O controller 910 may be implemented as part of one or more processors, such as the at least one processor 940. In some cases, a user may interact with the device 905 via the I / O controller 910 or via hardware components controlled by the I / O controller 910.

[0127] In some cases, the device 905 may include a single antenna. However, in some other cases, the device 905 may have more than one antenna, which may be capable of concurrently transmitting or receiving multiple wireless transmissions. The transceiver 915 may communicate bi-directionally via the one or more antennas 925 using wired or wireless links as described herein. For example, the transceiver 915 may represent a wireless transceiver and may communicate bi-directionally with another wireless transceiver. The transceiver 915 may also include a modem to modulate the packets, to provide the modulated packets to one or more antennas 925 for transmission, and to demodulate packets received from the one or more antennas 925. The transceiver 915, or the transceiver 915 and one or more antennas 925, may be an example of a transmitter 615, a transmitter 715, a receiver 610, a receiver 710, or any combination thereof or component thereof, as described herein.

[0128] The at least one memory 930 may include random access memory (RAM) and read-only memory (ROM). The at least one memory 930 may store computer- readable, computer-executable, or processor-executable code, such as the code 935. The code 935 may include instructions that, when executed by the at least one processor 940, cause the device 905 to perform various functions described herein. The code 935 may be stored in a non-transitory computer-readable medium such as system memory or another type of memory. In some cases, the code 935 may not be directly executable by the at least one processor 940 but may cause a computer (e.g., when compiled and executed) to perform functions described herein. In some cases, the at least one memory 930 may include, among other things, a basic I / O system (BIOS) which may control basic hardware or software operation such as the interaction with peripheral components or devices.

[0129] The at least one processor 940 may include one or more intelligent hardware devices (e.g., one or more general-purpose processors, one or more DSPs, one or more CPUs, one or more graphics processing units (GPUs), one or more neural processing units (NPUs) (also referred to as neural network processors or deep learning processors (DLPs)), one or more microcontrollers, one or more ASICs, one or more FPGAs, one or more programmable logic devices, discrete gate or transistor logic, one or more discrete hardware components, or any combination thereof). In some cases, the at least one processor 940 may be configured to operate a memory array using a memory controller. In some other cases, a memory controller may be integrated into the at least one processor 940. The at least one processor 940 may be configured to execute computer- readable instructions stored in a memory (e.g., the at least one memory 930) to cause the device 905 to perform various functions (e.g., functions or tasks supporting phase noise cancellation using a single pilot phase noise tracking reference signal). For example, the device 905 or a component of the device 905 may include at least one processor 940 and at least one memory 930 coupled with or to the at least one processor 940, the at least one processor 940 and the at least one memory 930 configured to perform various functions described herein.

[0130] In some examples, the at least one processor 940 may include multiple processors and the at least one memory 930 may include multiple memories. One or more of the multiple processors may be coupled with one or more of the multiple memories, which may, individually or collectively, be configured to perform various functions described herein. In some examples, the at least one processor 940 may be a component of a processing system, which may refer to a system (such as a series) of machines, circuitry (including, for example, one or both of processor circuitry (which may include the at least one processor 940) and memory circuitry (which may include the at least one memory 930)), or components, that receives or obtains inputs and processes the inputs to produce, generate, or obtain a set of outputs. The processing system may be configured to perform one or more of the functions described herein. For example, the at least one processor 940 or a processing system including the at least one processor 940 may be configured to, configurable to, or operable to cause the device 905 to perform one or more of the functions described herein. Further, as described herein, being “configured to,” being “configurable to,” and being “operable to” may beused interchangeably and may be associated with a capability, when executing code 935 (e.g., processor-executable code) stored in the at least one memory 930 or otherwise, to perform one or more of the functions described herein.

[0131] The communications manager 920 may support wireless communications in accordance with examples as disclosed herein. For example, the communications manager 920 is capable of, configured to, or operable to support a means for transmitting, to a network entity, a capability message indicating that the UE supports a single pilot tone scheme for phase noise cancellation. The communications manager 920 is capable of, configured to, or operable to support a means for receiving, from the network entity, control signaling indicating a configuration of a PTRS waveform based on the capability message, where the configuration indicates that the PTRS waveform includes a single pilot tone surrounded by a set of multiple zero-amplitude tones within a TTI. The communications manager 920 is capable of, configured to, or operable to support a means for receiving, within the TTI, the PTRS waveform in accordance with the configuration. The communications manager 920 is capable of, configured to, or operable to support a means for receiving, within the TTI, a data message based on a phase noise cancellation operation performed using the PTRS waveform.

[0132] By including or configuring the communications manager 920 in accordance with examples as described herein, the device 905 may support techniques for reduced latency and improved user experience related to reduced processing and improved throughput.

[0133] In some examples, the communications manager 920 may be configured to perform various operations (e.g., receiving, monitoring, transmitting) using or otherwise in cooperation with the transceiver 915, the one or more antennas 925, or any combination thereof. Although the communications manager 920 is illustrated as a separate component, in some examples, one or more functions described with reference to the communications manager 920 may be supported by or performed by the at least one processor 940, the at least one memory 930, the code 935, or any combination thereof. For example, the code 935 may include instructions executable by the at least one processor 940 to cause the device 905 to perform various aspects of phase noise cancellation using a single pilot phase noise tracking reference signal as described herein, or the at least one processor 940 and the at least one memory 930 may beotherwise configured to, individually or collectively, perform or support such operations.

[0134] FIG. 10 shows a block diagram 1000 of a device 1005 that supports phase noise cancellation using a single pilot phase noise tracking reference signal in accordance with one or more aspects of the present disclosure. The device 1005 may be an example of aspects of a network entity 105 as described herein. The device 1005 may include a receiver 1010, a transmitter 1015, and a communications manager 1020. The device 1005, or one or more components of the device 1005 (e.g., the receiver 1010, the transmitter 1015, the communications manager 1020), may include at least one processor, which may be coupled with at least one memory, to, individually or collectively, support or enable the described techniques. Each of these components may be in communication with one another (e.g., via one or more buses).

[0135] The receiver 1010 may provide a means for obtaining (e.g., receiving, determining, identifying) information such as user data, control information, or any combination thereof (e.g., I / Q samples, symbols, packets, protocol data units, service data units) associated with various channels (e.g., control channels, data channels, information channels, channels associated with a protocol stack). Information may be passed on to other components of the device 1005. In some examples, the receiver 1010 may support obtaining information by receiving signals via one or more antennas. Additionally, or alternatively, the receiver 1010 may support obtaining information by receiving signals via one or more wired (e.g., electrical, fiber optic) interfaces, wireless interfaces, or any combination thereof.

[0136] The transmitter 1015 may provide a means for outputting (e.g., transmitting, providing, conveying, sending) information generated by other components of the device 1005. For example, the transmitter 1015 may output information such as user data, control information, or any combination thereof (e.g., I / Q samples, symbols, packets, protocol data units, service data units) associated with various channels (e.g., control channels, data channels, information channels, channels associated with a protocol stack). In some examples, the transmitter 1015 may support outputting information by transmitting signals via one or more antennas. Additionally, or alternatively, the transmitter 1015 may support outputting information by transmitting signals via one or more wired (e.g., electrical, fiber optic) interfaces, wireless interfaces,or any combination thereof. In some examples, the transmitter 1015 and the receiver 1010 may be co-located in a transceiver, which may include or be coupled with a modem.

[0137] The communications manager 1020, the receiver 1010, the transmitter 1015, or various combinations or components thereof may be examples of means for performing various aspects of phase noise cancellation using a single pilot phase noise tracking reference signal as described herein. For example, the communications manager 1020, the receiver 1010, the transmitter 1015, or various combinations or components thereof may be capable of performing one or more of the functions described herein.

[0138] In some examples, the communications manager 1020, the receiver 1010, the transmitter 1015, or various combinations or components thereof may be implemented in hardware (e.g., in communications management circuitry). The hardware may include at least one of a processor, a DSP, a CPU, an ASIC, an FPGA or other programmable logic device, a microcontroller, discrete gate or transistor logic, discrete hardware components, or any combination thereof configured as or otherwise supporting, individually or collectively, a means for performing the functions described in the present disclosure. In some examples, at least one processor and at least one memory coupled with the at least one processor may be configured to perform one or more of the functions described herein (e.g., by one or more processors, individually or collectively, executing instructions stored in the at least one memory).

[0139] Additionally, or alternatively, the communications manager 1020, the receiver 1010, the transmitter 1015, or various combinations or components thereof may be implemented in code (e.g., as communications management software or firmware) executed by at least one processor (e.g., referred to as a processor-executable code). If implemented in code executed by at least one processor, the functions of the communications manager 1020, the receiver 1010, the transmitter 1015, or various combinations or components thereof may be performed by a general-purpose processor, a DSP, a CPU, an ASIC, an FPGA, a microcontroller, or any combination of these or other programmable logic devices (e.g., configured as or otherwise supporting, individually or collectively, a means for performing the functions described in the present disclosure).

[0140] In some examples, the communications manager 1020 may be configured to perform various operations (e.g., receiving, obtaining, monitoring, outputting, transmitting) using or otherwise in cooperation with the receiver 1010, the transmitter 1015, or both. For example, the communications manager 1020 may receive information from the receiver 1010, send information to the transmitter 1015, or be integrated in combination with the receiver 1010, the transmitter 1015, or both to obtain information, output information, or perform various other operations as described herein.

[0141] The communications manager 1020 may support wireless communications in accordance with examples as disclosed herein. For example, the communications manager 1020 is capable of, configured to, or operable to support a means for obtaining, from a UE, a capability message indicating that the UE supports a single pilot tone scheme for phase noise cancellation. The communications manager 1020 is capable of, configured to, or operable to support a means for outputting, to the UE, control signaling indicating a configuration for a PTRS waveform based on the capability message, where the configuration indicates that the PTRS waveform includes a single pilot tone surrounded by a set of multiple zero-amplitude tones within a TTI. The communications manager 1020 is capable of, configured to, or operable to support a means for outputting, within the TTI, the PTRS waveform in accordance with the configuration. The communications manager 1020 is capable of, configured to, or operable to support a means for outputting, within the TTI, a data message.

[0142] By including or configuring the communications manager 1020 in accordance with examples as described herein, the device 1005 (e.g., at least one processor controlling or otherwise coupled with the receiver 1010, the transmitter 1015, the communications manager 1020, or a combination thereof) may support techniques for reduced processing.

[0143] FIG. 11 shows a block diagram 1100 of a device 1105 that supports phase noise cancellation using a single pilot phase noise tracking reference signal in accordance with one or more aspects of the present disclosure. The device 1105 may be an example of aspects of a device 1005 or a network entity 105 as described herein. The device 1105 may include a receiver 1110, a transmitter 1115, and a communications manager 1120. The device 1105, or one or more components of the device 1105 (e.g.,the receiver 1110, the transmitter 1115, the communications manager 1120), may include at least one processor, which may be coupled with at least one memory, to support the described techniques. Each of these components may be in communication with one another (e.g., via one or more buses).

[0144] The receiver 1110 may provide a means for obtaining (e.g., receiving, determining, identifying) information such as user data, control information, or any combination thereof (e.g., I / Q samples, symbols, packets, protocol data units, service data units) associated with various channels (e.g., control channels, data channels, information channels, channels associated with a protocol stack). Information may be passed on to other components of the device 1105. In some examples, the receiver 1110 may support obtaining information by receiving signals via one or more antennas. Additionally, or alternatively, the receiver 1110 may support obtaining information by receiving signals via one or more wired (e.g., electrical, fiber optic) interfaces, wireless interfaces, or any combination thereof.

[0145] The transmitter 1115 may provide a means for outputting (e.g., transmitting, providing, conveying, sending) information generated by other components of the device 1105. For example, the transmitter 1115 may output information such as user data, control information, or any combination thereof (e.g., I / Q samples, symbols, packets, protocol data units, service data units) associated with various channels (e.g., control channels, data channels, information channels, channels associated with a protocol stack). In some examples, the transmitter 1115 may support outputting information by transmitting signals via one or more antennas. Additionally, or alternatively, the transmitter 1115 may support outputting information by transmitting signals via one or more wired (e.g., electrical, fiber optic) interfaces, wireless interfaces, or any combination thereof. In some examples, the transmitter 1115 and the receiver 1110 may be co-located in a transceiver, which may include or be coupled with a modem.

[0146] The device 1105, or various components thereof, may be an example of means for performing various aspects of phase noise cancellation using a single pilot phase noise tracking reference signal as described herein. For example, the communications manager 1120 may include a capability message manager 1125, a control signaling manager 1130, an PTRS waveform manager 1135, a data messagemanager 1140, or any combination thereof. The communications manager 1120 may be an example of aspects of a communications manager 1020 as described herein. In some examples, the communications manager 1120, or various components thereof, may be configured to perform various operations (e.g., receiving, obtaining, monitoring, outputting, transmitting) using or otherwise in cooperation with the receiver 1110, the transmitter 1115, or both. For example, the communications manager 1120 may receive information from the receiver 1110, send information to the transmitter 1115, or be integrated in combination with the receiver 1110, the transmitter 1115, or both to obtain information, output information, or perform various other operations as described herein.

[0147] The communications manager 1120 may support wireless communications in accordance with examples as disclosed herein. The capability message manager 1125 is capable of, configured to, or operable to support a means for obtaining, from a UE, a capability message indicating that the UE supports a single pilot tone scheme for phase noise cancellation. The control signaling manager 1130 is capable of, configured to, or operable to support a means for outputting, to the UE, control signaling indicating a configuration for a PTRS waveform based on the capability message, where the configuration indicates that the PTRS waveform includes a single pilot tone surrounded by a set of multiple zero-amplitude tones within a TTI. The PTRS waveform manager 1135 is capable of, configured to, or operable to support a means for outputting, within the TTI, the PTRS waveform in accordance with the configuration. The data message manager 1140 is capable of, configured to, or operable to support a means for outputting, within the TTI, a data message.

[0148] FIG. 12 shows a block diagram 1200 of a communications manager 1220 that supports phase noise cancellation using a single pilot phase noise tracking reference signal in accordance with one or more aspects of the present disclosure. The communications manager 1220 may be an example of aspects of a communications manager 1020, a communications manager 1120, or both, as described herein. The communications manager 1220, or various components thereof, may be an example of means for performing various aspects of phase noise cancellation using a single pilot phase noise tracking reference signal as described herein. For example, the communications manager 1220 may include a capability message manager 1225, acontrol signaling manager 1230, an PTRS waveform manager 1235, a data message manager 1240, or any combination thereof. Each of these components, or components or subcomponents thereof (e.g., one or more processors, one or more memories), may communicate, directly or indirectly, with one another (e.g., via one or more buses). The communications may include communications within a protocol layer of a protocol stack, communications associated with a logical channel of a protocol stack (e.g., between protocol layers of a protocol stack, within a device, component, or virtualized component associated with a network entity 105, between devices, components, or virtualized components associated with a network entity 105), or any combination thereof.

[0149] The communications manager 1220 may support wireless communications in accordance with examples as disclosed herein. The capability message manager 1225 is capable of, configured to, or operable to support a means for obtaining, from a UE, a capability message indicating that the UE supports a single pilot tone scheme for phase noise cancellation. The control signaling manager 1230 is capable of, configured to, or operable to support a means for outputting, to the UE, control signaling indicating a configuration for a PTRS waveform based on the capability message, where the configuration indicates that the PTRS waveform includes a single pilot tone surrounded by a set of multiple zero-amplitude tones within a TTI. The PTRS waveform manager 1235 is capable of, configured to, or operable to support a means for outputting, within the TTI, the PTRS waveform in accordance with the configuration. The data message manager 1240 is capable of, configured to, or operable to support a means for outputting, within the TTI, a data message.

[0150] In some examples, to support outputting the control signaling, the control signaling manager 1230 is capable of, configured to, or operable to support a means for outputting a control message indicating the configuration that identifies one or more parameters associated with the PTRS waveform, the one or more parameters including a bandwidth of the PTRS waveform, a location of the bandwidth of the PTRS waveform within a channel, a location of the single pilot tone within the bandwidth of the PTRS waveform, or any combination thereof.

[0151] In some examples, the control signaling manager 1230 is capable of, configured to, or operable to support a means for outputting, to the UE, controlsignaling indicating an updated configuration for the PTRS waveform. In some examples, the PTRS waveform manager 1235 is capable of, configured to, or operable to support a means for outputting, within a second TTI, a second PTRS waveform in accordance with the updated configuration. In some examples, the data message manager 1240 is capable of, configured to, or operable to support a means for outputting, within the second TTI, a second data message.

[0152] In some examples, to support outputting the PTRS waveform, the PTRS waveform manager 1235 is capable of, configured to, or operable to support a means for outputting the single pilot tone at a first transmit power level that exceeds a second transmit power level of the data message.

[0153] In some examples, to support outputting the control signaling, the control signaling manager 1230 is capable of, configured to, or operable to support a means for outputting a control message that indicates a channel including a subchannel for the PTRS waveform and a second subchannel for the data message.

[0154] In some examples, to support outputting the control signaling, the control signaling manager 1230 is capable of, configured to, or operable to support a means for outputting DCI indicating the configuration for the PTRS waveform.

[0155] FIG. 13 shows a diagram of a system 1300 including a device 1305 that supports phase noise cancellation using a single pilot phase noise tracking reference signal in accordance with one or more aspects of the present disclosure. The device 1305 may be an example of or include components of a device 1005, a device 1105, or a network entity 105 as described herein. The device 1305 may communicate with other network devices or network equipment such as one or more of the network entities 105, UEs 115, or any combination thereof. The communications may include communications over one or more wired interfaces, over one or more wireless interfaces, or any combination thereof. The device 1305 may include components that support outputting and obtaining communications, such as a communications manager 1320, a transceiver 1310, one or more antennas 1315, at least one memory 1325, code 1330, and at least one processor 1335. These components may be in electronic communication or otherwise coupled (e.g., operatively, communicatively, functionally, electronically, electrically) via one or more buses (e.g., a bus 1340).

[0156] The transceiver 1310 may support bi-directional communications via wired links, wireless links, or both as described herein. In some examples, the transceiver 1310 may include a wired transceiver and may communicate bi-directionally with another wired transceiver. Additionally, or alternatively, in some examples, the transceiver 1310 may include a wireless transceiver and may communicate bidirectionally with another wireless transceiver. In some examples, the device 1305 may include one or more antennas 1315, which may be capable of transmitting or receiving wireless transmissions (e.g., concurrently). The transceiver 1310 may also include a modem to modulate signals, to provide the modulated signals for transmission (e.g., by one or more antennas 1315, by a wired transmitter), to receive modulated signals (e.g., from one or more antennas 1315, from a wired receiver), and to demodulate signals. In some implementations, the transceiver 1310 may include one or more interfaces, such as one or more interfaces coupled with the one or more antennas 1315 that are configured to support various receiving or obtaining operations, or one or more interfaces coupled with the one or more antennas 1315 that are configured to support various transmitting or outputting operations, or a combination thereof. In some implementations, the transceiver 1310 may include or be configured for coupling with one or more processors or one or more memory components that are operable to perform or support operations based on received or obtained information or signals, or to generate information or other signals for transmission or other outputting, or any combination thereof. In some implementations, the transceiver 1310, or the transceiver 1310 and the one or more antennas 1315, or the transceiver 1310 and the one or more antennas 1315 and one or more processors or one or more memory components (e.g., the at least one processor 1335, the at least one memory 1325, or both), may be included in a chip or chip assembly that is installed in the device 1305. In some examples, the transceiver 1310 may be operable to support communications via one or more communications links (e.g., communication link(s) 125, backhaul communication link(s) 120, a midhaul communication link 162, a fronthaul communication link 168).

[0157] The at least one memory 1325 may include RAM, ROM, or any combination thereof. The at least one memory 1325 may store computer-readable, computerexecutable, or processor-executable code, such as the code 1330. The code 1330 may include instructions that, when executed by one or more of the at least one processor1335, cause the device 1305 to perform various functions described herein. The code 1330 may be stored in a non -transitory computer-readable medium such as system memory or another type of memory. In some cases, the code 1330 may not be directly executable by a processor of the at least one processor 1335 but may cause a computer (e.g., when compiled and executed) to perform functions described herein. In some cases, the at least one memory 1325 may include, among other things, a BIOS which may control basic hardware or software operation such as the interaction with peripheral components or devices. In some examples, the at least one processor 1335 may include multiple processors and the at least one memory 1325 may include multiple memories. One or more of the multiple processors may be coupled with one or more of the multiple memories which may, individually or collectively, be configured to perform various functions herein (for example, as part of a processing system).

[0158] The at least one processor 1335 may include one or more intelligent hardware devices (e.g., one or more general-purpose processors, one or more DSPs, one or more CPUs, one or more graphics processing units (GPUs), one or more neural processing units (NPUs) (also referred to as neural network processors or deep learning processors (DLPs)), one or more microcontrollers, one or more ASICs, one or more FPGAs, one or more programmable logic devices, discrete gate or transistor logic, one or more discrete hardware components, or any combination thereof). In some cases, the at least one processor 1335 may be configured to operate a memory array using a memory controller. In some other cases, a memory controller may be integrated into one or more of the at least one processor 1335. The at least one processor 1335 may be configured to execute computer-readable instructions stored in a memory (e.g., one or more of the at least one memory 1325) to cause the device 1305 to perform various functions (e.g., functions or tasks supporting phase noise cancellation using a single pilot phase noise tracking reference signal). For example, the device 1305 or a component of the device 1305 may include at least one processor 1335 and at least one memory 1325 coupled with one or more of the at least one processor 1335, the at least one processor 1335 and the at least one memory 1325 configured to perform various functions described herein. The at least one processor 1335 may be an example of a cloud-computing platform (e.g., one or more physical nodes and supporting software such as operating systems, virtual machines, or container instances) that may host thefunctions (e.g., by executing code 1330) to perform the functions of the device 1305. The at least one processor 1335 may be any one or more suitable processors capable of executing scripts or instructions of one or more software programs stored in the device 1305 (such as within one or more of the at least one memory 1325).

[0159] In some examples, the at least one processor 1335 may include multiple processors and the at least one memory 1325 may include multiple memories. One or more of the multiple processors may be coupled with one or more of the multiple memories, which may, individually or collectively, be configured to perform various functions herein. In some examples, the at least one processor 1335 may be a component of a processing system, which may refer to a system (such as a series) of machines, circuitry (including, for example, one or both of processor circuitry (which may include the at least one processor 1335) and memory circuitry (which may include the at least one memory 1325)), or components, that receives or obtains inputs and processes the inputs to produce, generate, or obtain a set of outputs. The processing system may be configured to perform one or more of the functions described herein. For example, the at least one processor 1335 or a processing system including the at least one processor 1335 may be configured to, configurable to, or operable to cause the device 1305 to perform one or more of the functions described herein. Further, as described herein, being “configured to,” being “configurable to,” and being “operable to” may be used interchangeably and may be associated with a capability, when executing code stored in the at least one memory 1325 or otherwise, to perform one or more of the functions described herein.

[0160] In some examples, a bus 1340 may support communications of (e.g., within) a protocol layer of a protocol stack. In some examples, a bus 1340 may support communications associated with a logical channel of a protocol stack (e.g., between protocol layers of a protocol stack), which may include communications performed within a component of the device 1305, or between different components of the device 1305 that may be co-located or located in different locations (e.g., where the device 1305 may refer to a system in which one or more of the communications manager 1320, the transceiver 1310, the at least one memory 1325, the code 1330, and the at least one processor 1335 may be located in one of the different components or divided between different components).

[0161] In some examples, the communications manager 1320 may manage aspects of communications with a core network 130 (e.g., via one or more wired or wireless backhaul links). For example, the communications manager 1320 may manage the transfer of data communications for client devices, such as one or more UEs 115. In some examples, the communications manager 1320 may manage communications with one or more other network entities 105, and may include a controller or scheduler for controlling communications with UEs 115 (e.g., in cooperation with the one or more other network devices). In some examples, the communications manager 1320 may support an X2 interface within an LTE / LTE-A wireless communications network technology to provide communication between network entities 105.

[0162] The communications manager 1320 may support wireless communications in accordance with examples as disclosed herein. For example, the communications manager 1320 is capable of, configured to, or operable to support a means for obtaining, from a UE, a capability message indicating that the UE supports a single pilot tone scheme for phase noise cancellation. The communications manager 1320 is capable of, configured to, or operable to support a means for outputting, to the UE, control signaling indicating a configuration for a PTRS waveform based on the capability message, where the configuration indicates that the PTRS waveform includes a single pilot tone surrounded by a set of multiple zero-amplitude tones within a TTI. The communications manager 1320 is capable of, configured to, or operable to support a means for outputting, within the TTI, the PTRS waveform in accordance with the configuration. The communications manager 1320 is capable of, configured to, or operable to support a means for outputting, within the TTI, a data message.

[0163] By including or configuring the communications manager 1320 in accordance with examples as described herein, the device 1305 may support techniques for reduced latency and improved user experience related to reduced processing and improved throughput.

[0164] In some examples, the communications manager 1320 may be configured to perform various operations (e.g., receiving, obtaining, monitoring, outputting, transmitting) using or otherwise in cooperation with the transceiver 1310, the one or more antennas 1315 (e.g., where applicable), or any combination thereof. Although the communications manager 1320 is illustrated as a separate component, in someexamples, one or more functions described with reference to the communications manager 1320 may be supported by or performed by the transceiver 1310, one or more of the at least one processor 1335, one or more of the at least one memory 1325, the code 1330, or any combination thereof (for example, by a processing system including at least a portion of the at least one processor 1335, the at least one memory 1325, the code 1330, or any combination thereof). For example, the code 1330 may include instructions executable by one or more of the at least one processor 1335 to cause the device 1305 to perform various aspects of phase noise cancellation using a single pilot phase noise tracking reference signal as described herein, or the at least one processor 1335 and the at least one memory 1325 may be otherwise configured to, individually or collectively, perform or support such operations.

[0165] FIG. 14 shows a flowchart illustrating a method 1400 that supports phase noise cancellation using a single pilot phase noise tracking reference signal in accordance with one or more aspects of the present disclosure. The operations of the method 1400 may be implemented by a UE or its components as described herein. For example, the operations of the method 1400 may be performed by a UE 115 as described with reference to FIGs. 1 through 9. In some examples, a UE may execute a set of instructions to control the functional elements of the UE to perform the described functions. Additionally, or alternatively, the UE may perform aspects of the described functions using special-purpose hardware.

[0166] At 1405, the method may include transmitting, to a network entity, a capability message indicating that the UE supports a single pilot tone scheme for phase noise cancellation. The operations of 1405 may be performed in accordance with examples as disclosed herein. In some examples, aspects of the operations of 1405 may be performed by a capability message component 825 as described with reference to FIG. 8.

[0167] At 1410, the method may include receiving, from the network entity, control signaling indicating a configuration of a PTRS waveform based on the capability message, where the configuration indicates that the PTRS waveform includes a single pilot tone surrounded by a set of multiple zero-amplitude tones within a TTI. The operations of 1410 may be performed in accordance with examples as disclosed herein.In some examples, aspects of the operations of 1410 may be performed by a control signaling component 830 as described with reference to FIG. 8.

[0168] At 1415, the method may include receiving, within the TTI, the PTRS waveform in accordance with the configuration. The operations of 1415 may be performed in accordance with examples as disclosed herein. In some examples, aspects of the operations of 1415 may be performed by an PTRS waveform component 835 as described with reference to FIG. 8.

[0169] At 1420, the method may include receiving, within the TTI, a data message based on a phase noise cancellation operation performed using the PTRS waveform. The operations of 1420 may be performed in accordance with examples as disclosed herein. In some examples, aspects of the operations of 1420 may be performed by a data message component 840 as described with reference to FIG. 8.

[0170] FIG. 15 shows a flowchart illustrating a method 1500 that supports phase noise cancellation using a single pilot phase noise tracking reference signal in accordance with one or more aspects of the present disclosure. The operations of the method 1500 may be implemented by a network entity or its components as described herein. For example, the operations of the method 1500 may be performed by a network entity as described with reference to FIGs. 1 through 5 and 10 through 13. In some examples, a network entity may execute a set of instructions to control the functional elements of the network entity to perform the described functions. Additionally, or alternatively, the network entity may perform aspects of the described functions using special-purpose hardware.

[0171] At 1505, the method may include obtaining, from a UE, a capability message indicating that the UE supports a single pilot tone scheme for phase noise cancellation. The operations of 1505 may be performed in accordance with examples as disclosed herein. In some examples, aspects of the operations of 1505 may be performed by a capability message manager 1225 as described with reference to FIG. 12.

[0172] At 1510, the method may include outputting, to the UE, control signaling indicating a configuration for a PTRS waveform based on the capability message, where the configuration indicates that the PTRS waveform includes a single pilot tone surrounded by a set of multiple zero-amplitude tones within a TTI. The operations of 1510 may be performed in accordance with examples as disclosed herein. In someexamples, aspects of the operations of 1510 may be performed by a control signaling manager 1230 as described with reference to FIG. 12.

[0173] At 1515, the method may include outputting, within the TTI, the PTRS waveform in accordance with the configuration. The operations of 1515 may be performed in accordance with examples as disclosed herein. In some examples, aspects of the operations of 1515 may be performed by an PTRS waveform manager 1235 as described with reference to FIG. 12.

[0174] At 1520, the method may include outputting, within the TTI, a data message. The operations of 1520 may be performed in accordance with examples as disclosed herein. In some examples, aspects of the operations of 1520 may be performed by a data message manager 1240 as described with reference to FIG. 12.

[0175] The following provides an overview of aspects of the present disclosure:

[0176] Aspect 1 : A method for wireless communications at a UE, comprising: transmitting, to a network entity, a capability message indicating that the UE supports a single pilot tone scheme for phase noise cancellation; receiving, from the network entity, control signaling indicating a configuration of a PTRS waveform based at least in part on the capability message, wherein the configuration indicates that the PTRS waveform comprises a single pilot tone surrounded by a plurality of zero-amplitude tones within a TTI; receiving, within the TTI, the PTRS waveform in accordance with the configuration; and receiving, within the TTI, a data message based at least in part on a phase noise cancellation operation performed using the PTRS waveform.

[0177] Aspect 2: The method of aspect 1, wherein receiving the control signaling further comprises: receiving a control message indicating the configuration that identifies one or more parameters associated with the PTRS waveform, the one or more parameters comprising a bandwidth of the PTRS waveform, a location of the bandwidth of the PTRS waveform within a channel, a location of the single pilot tone within the bandwidth of the PTRS waveform, or any combination thereof.

[0178] Aspect 3: The method of any of aspects 1 through 2, wherein receiving the control signaling further comprises: receiving a control message that indicates a channel comprising a subchannel for the PTRS waveform and a second subchannel for the data message.

[0179] Aspect 4: The method of any of aspects 1 through 3, further comprising: receiving an indication of an updated configuration for the PTRS waveform; receiving, within a second TTI, a second PTRS waveform in accordance with the updated configuration; and receiving, within the second TTI, a second data message based at least in part on a second phase noise cancellation operation performed using the second PTRS waveform.

[0180] Aspect 5: The method of any of aspects 1 through 4, further comprising: demodulating the data message using an estimated phase noise of the phase noise cancellation operation.

[0181] Aspect 6: The method of any of aspects 1 through 5, further comprising: estimating phase noise associated with a signal comprising the data message based at least in part on the PTRS waveform.

[0182] Aspect 7: The method of any of aspects 1 through 6, wherein transmitting the capability message further comprises: transmitting a MAC-CE indicating that the UE supports the single pilot tone scheme for phase noise cancellation.

[0183] Aspect 8: A method for wireless communications at a network entity, comprising: obtaining, from a UE, a capability message indicating that the UE supports a single pilot tone scheme for phase noise cancellation; outputting, to the UE, control signaling indicating a configuration for a PTRS waveform based at least in part on the capability message, wherein the configuration indicates that the PTRS waveform comprises a single pilot tone surrounded by a plurality of zero-amplitude tones within a TTI; outputting, within the TTI, the PTRS waveform in accordance with the configuration; and outputting, within the TTI, a data message.

[0184] Aspect 9: The method of aspect 8, wherein outputting the control signaling further comprises: outputting a control message indicating the configuration that identifies one or more parameters associated with the PTRS waveform, the one or more parameters comprising a bandwidth of the PTRS waveform, a location of the bandwidth of the PTRS waveform within a channel, a location of the single pilot tone within the bandwidth of the PTRS waveform, or any combination thereof.

[0185] Aspect 10: The method of any of aspects 8 through 9, further comprising: outputting, to the UE, control signaling indicating an updated configuration for the PTRS waveform; outputting, within a second TTI, a second PTRS waveform in accordance with the updated configuration; and outputting, within the second TTI, a second data message.

[0186] Aspect 11 : The method of any of aspects 8 through 10, wherein outputting the PTRS waveform further comprises: outputting the single pilot tone at a first transmit power level that exceeds a second transmit power level of the data message.

[0187] Aspect 12: The method of any of aspects 8 through 11, wherein outputting the control signaling further comprises: outputting a control message that indicates a channel comprising a subchannel for the PTRS waveform and a second subchannel for the data message.

[0188] Aspect 13: The method of any of aspects 8 through 12, wherein outputting the control signaling further comprises: outputting DCI indicating the configuration for the PTRS waveform.

[0189] Aspect 14: A UE for wireless communications, comprising one or more memories storing processor-executable code, and one or more processors coupled with the one or more memories and individually or collectively operable to execute the code to cause the UE to perform a method of any of aspects 1 through 7.

[0190] Aspect 15: A UE for wireless communications, comprising at least one means for performing a method of any of aspects 1 through 7.

[0191] Aspect 16: A non-transitory computer-readable medium storing code for wireless communications, the code comprising instructions executable by one or more processors to perform a method of any of aspects 1 through 7.

[0192] Aspect 17: A network entity for wireless communications, comprising one or more memories storing processor-executable code, and one or more processors coupled with the one or more memories and individually or collectively operable to execute the code to cause the network entity to perform a method of any of aspects 8 through 13.

[0193] Aspect 18: A network entity for wireless communications, comprising at least one means for performing a method of any of aspects 8 through 13.

[0194] Aspect 19: A non-transitory computer-readable medium storing code for wireless communications, the code comprising instructions executable by one or more processors to perform a method of any of aspects 8 through 13.

[0195] It should be noted that the methods described herein describe possible implementations. The operations and the steps may be rearranged or otherwise modified and other implementations are possible. Further, aspects from two or more of the methods may be combined.

[0196] Although aspects of an LTE, LTE-A, LTE-A Pro, or NR system may be described for purposes of example, and LTE, LTE-A, LTE-A Pro, or NR terminology may be used in much of the description, the techniques described herein are applicable beyond LTE, LTE-A, LTE-A Pro, or NR networks. For example, the described techniques may be applicable to various other wireless communications systems such as Ultra Mobile Broadband (UMB), Institute of Electrical and Electronics Engineers (IEEE) 802.11 (Wi-Fi), IEEE 802.16 (WiMAX), IEEE 802.20, Flash-OFDM, as well as other systems and radio technologies not explicitly mentioned herein.

[0197] Information and signals described herein may be represented using any of a variety of different technologies and techniques. For example, data, instructions, commands, information, signals, bits, symbols, and chips that may be referenced throughout the description may be represented by voltages, currents, electromagnetic waves, magnetic fields or particles, optical fields or particles, or any combination thereof.

[0198] The various illustrative blocks and components described in connection with the disclosure herein may be implemented or performed using a general-purpose processor, a DSP, an ASIC, a CPU, a graphics processing unit (GPU), a neural processing unit (NPU), an 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, in the alternative, the processor may be any processor, controller, microcontroller, or state machine. A processor may also be implemented as a combination of computing devices (e.g., a combination of a DSP and a microprocessor, multiple microprocessors, one or more microprocessors in conjunction with a DSP core,or any other such configuration). Any functions or operations described herein as being capable of being performed by a processor may be performed by multiple processors that, individually or collectively, are capable of performing the described functions or operations.

[0199] The functions described herein may be implemented using hardware, software executed by a processor, firmware, or any combination thereof. If implemented using software executed by a processor, the functions may be stored as or transmitted using one or more instructions or code of a computer-readable medium. Other examples and implementations are within the scope of the disclosure and appended claims. For example, due to the nature of software, functions described herein may be implemented using software executed by a processor, hardware, firmware, hardwiring, or combinations of any of these. Features implementing functions may also be physically located at various positions, including being distributed such that portions of functions are implemented at different physical locations.

[0200] Computer-readable media includes both non-transitory computer storage media and communication media including any medium that facilitates transfer of a computer program from one location to another. A non-transitory storage medium may be any available medium that may be accessed by a general-purpose or special-purpose computer. By way of example, and not limitation, non-transitory computer-readable media may include RAM, ROM, electrically erasable programmable ROM (EEPROM), flash memory, compact disk (CD) ROM or other optical disk storage, magnetic disk storage or other magnetic storage devices, or any other non-transitory medium that may be used to carry or store desired program code means in the form of instructions or data structures and that may be accessed by a general-purpose or special-purpose computer or a general-purpose or special-purpose processor. Also, any connection is properly termed a computer-readable medium. For example, if the software is transmitted from a website, server, or other remote source using a coaxial cable, fiber optic cable, twisted pair, digital subscriber line (DSL), or wireless technologies such as infrared, radio, and microwave, then the coaxial cable, fiber optic cable, twisted pair, DSL, or wireless technologies such as infrared, radio, and microwave are included in the definition of computer-readable medium. Disk and disc, as used herein, include CD, laser disc, optical disc, digital versatile disc (DVD), floppy disk, and Blu-ray disc. Disks mayreproduce data magnetically, and discs may reproduce data optically using lasers. Combinations of the above are also included within the scope of computer-readable media. Any functions or operations described herein as being capable of being performed by a memory may be performed by multiple memories that, individually or collectively, are capable of performing the described functions or operations.

[0201] As used herein, including in the claims, “or” as used in a list of items (e.g., a list of items prefaced by a phrase such as “at least one of’ or “one or more of’) indicates an inclusive list such that, for example, a list of at least one of A, B, or C means A or B or C or AB or AC or BC or ABC (i.e., A and B and C). Also, as used herein, the phrase “based on” shall not be construed as a reference to a closed set of conditions. For example, an example step that is described as “based on condition A” may be based on both a condition A and a condition B without departing from the scope of the present disclosure. In other words, as used herein, the phrase “based on” shall be construed in the same manner as the phrase “based at least in part on.”

[0202] As used herein, including in the claims, the article “a” before a noun is open- ended and understood to refer to “at least one” of those nouns or “one or more” of those nouns. Thus, the terms “a,” “at least one,” “one or more,” and “at least one of one or more” may be interchangeable. For example, if a claim recites “a component” that performs one or more functions, each of the individual functions may be performed by a single component or by any combination of multiple components. Thus, the term “a component” having characteristics or performing functions may refer to “at least one of one or more components” having a particular characteristic or performing a particular function. Subsequent reference to a component introduced with the article “a” using the terms “the” or “said” may refer to any or all of the one or more components. For example, a component introduced with the article “a” may be understood to mean “one or more components,” and referring to “the component” subsequently in the claims may be understood to be equivalent to referring to “at least one of the one or more components.” Similarly, subsequent reference to a component introduced as “one or more components” using the terms “the” or “said” may refer to any or all of the one or more components. For example, referring to “the one or more components” subsequently in the claims may be understood to be equivalent to referring to “at least one of the one or more components.”

[0203] The term “determine” or “determining” encompasses a variety of actions and, therefore, “determining” can include calculating, computing, processing, deriving, investigating, looking up (such as via looking up in a table, a database, or another data structure), ascertaining, and the like. Also, “determining” can include receiving (e.g., receiving information), accessing (e.g., accessing data stored in memory), and the like. Also, “determining” can include resolving, obtaining, selecting, choosing, establishing, and other such similar actions.

[0204] In the appended figures, similar components or features may have the same reference label. Further, various components of the same type may be distinguished by following the reference label by a dash and a second label that distinguishes among the similar components. If just the first reference label is used in the specification, the description is applicable to any one of the similar components having the same first reference label irrespective of the second reference label or other subsequent reference label.

[0205] The description set forth herein, in connection with the appended drawings, describes example configurations and does not represent all the examples that may be implemented or that are within the scope of the claims. The term “example” used herein means “serving as an example, instance, or illustration” and not “preferred” or “advantageous over other examples.” The detailed description includes specific details for the purpose of providing an understanding of the described techniques. These techniques, however, may be practiced without these specific details. In some figures, known structures and devices are shown in block diagram form in order to avoid obscuring the concepts of the described examples.

[0206] The description herein is provided to enable a person having ordinary skill in the art to make or use the disclosure. Various modifications to the disclosure will be apparent to a person having ordinary skill in the art, and the generic principles defined herein may be applied to other variations without departing from the scope of the disclosure. Thus, the disclosure is not limited to the examples and designs described herein but is to be accorded the broadest scope consistent with the principles and novel features disclosed herein.

Claims

CLAIMSWhat is claimed is:

1. A user equipment (UE), comprising: one or more memories storing processor-executable code; and one or more processors coupled with the one or more memories and individually or collectively operable to execute the code to cause the UE to: transmit, to a network entity, a capability message indicating that the UE supports a single pilot tone scheme for phase noise cancellation; receive, from the network entity, control signaling indicating a configuration of a phase tracking reference signal (PTRS) waveform based at least in part on the capability message, wherein the configuration indicates that the PTRS waveform comprises a single pilot tone surrounded by a plurality of zero-amplitude tones within a transmission time interval; receive, within the transmission time interval, the PTRS waveform in accordance with the configuration; and receive, within the transmission time interval, a data message based at least in part on a phase noise cancellation operation performed using the PTRS waveform.

2. The UE of claim 1, wherein, to receive the control signaling, the one or more processors are individually or collectively further operable to execute the code to cause the UE to: receive a control message indicating the configuration that identifies one or more parameters associated with the PTRS waveform, the one or more parameters comprising a bandwidth of the PTRS waveform, a location of the bandwidth of the PTRS waveform within a channel, a location of the single pilot tone within the bandwidth of the PTRS waveform, or any combination thereof.

3. The UE of claim 1, wherein, to receive the control signaling, the one or more processors are individually or collectively further operable to execute the code to cause the UE to: receive a control message that indicates a channel comprising a subchannel for the PTRS waveform and a second subchannel for the data message.

4. The UE of claim 1, wherein the one or more processors are individually or collectively further operable to execute the code to cause the UE to: receive an indication of an updated configuration for the PTRS waveform; receive, within a second transmission time interval, a second PTRS waveform in accordance with the updated configuration; and receive, within the second transmission time interval, a second data message based at least in part on a second phase noise cancellation operation performed using the second PTRS waveform.

5. The UE of claim 1, wherein the one or more processors are individually or collectively further operable to execute the code to cause the UE to: demodulate the data message using an estimated phase noise of the phase noise cancellation operation.

6. The UE of claim 1, wherein the one or more processors are individually or collectively further operable to execute the code to cause the UE to: estimate phase noise associated with a signal comprising the data message based at least in part on the PTRS waveform.

7. The UE of claim 1, wherein, to transmit the capability message, the one or more processors are individually or collectively further operable to execute the code to cause the UE to: transmit a medium access control (MAC) control element (CE) indicating that the UE supports the single pilot tone scheme for phase noise cancellation.

8. A network entity, comprising: one or more memories storing processor-executable code; and one or more processors coupled with the one or more memories and individually or collectively operable to execute the code to cause the network entity to: obtain, from a user equipment (UE), a capability message indicating that the UE supports a single pilot tone scheme for phase noise cancellation;output, to the UE, control signaling indicating a configuration for a PTRS waveform based at least in part on the capability message, wherein the configuration indicates that the PTRS waveform comprises a single pilot tone surrounded by a plurality of zero-amplitude tones within a transmission time interval; output, within the transmission time interval, the PTRS waveform in accordance with the configuration; and output, within the transmission time interval, a data message.

9. The network entity of claim 8, wherein, to output the control signaling, the one or more processors are individually or collectively further operable to execute the code to cause the network entity to: output a control message indicating the configuration that identifies one or more parameters associated with the PTRS waveform, the one or more parameters comprising a bandwidth of the PTRS waveform, a location of the bandwidth of the PTRS waveform within a channel, a location of the single pilot tone within the bandwidth of the PTRS waveform, or any combination thereof.

10. The network entity of claim 8, wherein the one or more processors are individually or collectively further operable to execute the code to cause the network entity to: output, to the UE, control signaling indicating an updated configuration for the PTRS waveform; output, within a second transmission time interval, a second PTRS waveform in accordance with the updated configuration; and output, within the second transmission time interval, a second data message.

11. The network entity of claim 8, wherein, to output the PTRS waveform, the one or more processors are individually or collectively further operable to execute the code to cause the network entity to: output the single pilot tone at a first transmit power level that exceeds a second transmit power level of the data message.

12. The network entity of claim 8, wherein, to output the control signaling, the one or more processors are individually or collectively further operable to execute the code to cause the network entity to: output a control message that indicates a channel comprising a subchannel for the PTRS waveform and a second subchannel for the data message.

13. The network entity of claim 8, wherein, to output the control signaling, the one or more processors are individually or collectively further operable to execute the code to cause the network entity to: output downlink control information (DCI) indicating the configuration for the PTRS waveform.

14. A method for wireless communications at a user equipment (UE), comprising: transmitting, to a network entity, a capability message indicating that the UE supports a single pilot tone scheme for phase noise cancellation; receiving, from the network entity, control signaling indicating a configuration of a phase tracking reference signal (PTRS) waveform based at least in part on the capability message, wherein the configuration indicates that the PTRS waveform comprises a single pilot tone surrounded by a plurality of zero-amplitude tones within a transmission time interval; receiving, within the transmission time interval, the PTRS waveform in accordance with the configuration; and receiving, within the transmission time interval, a data message based at least in part on a phase noise cancellation operation performed using the PTRS waveform.

15. The method of claim 14, wherein receiving the control signaling further comprises: receiving a control message indicating the configuration that identifies one or more parameters associated with the PTRS waveform, the one or more parameters comprising a bandwidth of the PTRS waveform, a location of the bandwidth of the PTRS waveform within a channel, a location of the single pilot tone within the bandwidth of the PTRS waveform, or any combination thereof.

16. The method of claim 14, wherein receiving the control signaling further comprises: receiving a control message that indicates a channel comprising a subchannel for the PTRS waveform and a second subchannel for the data message.

17. The method of claim 14, further comprising: receiving an indication of an updated configuration for the PTRS waveform; receiving, within a second transmission time interval, a second PTRS waveform in accordance with the updated configuration; and receiving, within the second transmission time interval, a second data message based at least in part on a second phase noise cancellation operation performed using the second PTRS waveform.

18. The method of claim 14, further comprising: demodulating the data message using an estimated phase noise of the phase noise cancellation operation.

19. The method of claim 14, further comprising: estimating phase noise associated with a signal comprising the data message based at least in part on the PTRS waveform.

20. The method of claim 14, wherein transmitting the capability message further comprises: transmitting a medium access control (MAC) control element (CE) indicating that the UE supports the single pilot tone scheme for phase noise cancellation.

21. A method for wireless communications at a network entity, comprising: obtaining, from a user equipment (UE), a capability message indicating that the UE supports a single pilot tone scheme for phase noise cancellation; outputting, to the UE, control signaling indicating a configuration for a PTRS waveform based at least in part on the capability message, wherein theconfiguration indicates that the PTRS waveform comprises a single pilot tone surrounded by a plurality of zero-amplitude tones within a transmission time interval; outputting, within the transmission time interval, the PTRS waveform in accordance with the configuration; and outputting, within the transmission time interval, a data message.

22. The method of claim 21, wherein outputting the control signaling further comprises: outputting a control message indicating the configuration that identifies one or more parameters associated with the PTRS waveform, the one or more parameters comprising a bandwidth of the PTRS waveform, a location of the bandwidth of the PTRS waveform within a channel, a location of the single pilot tone within the bandwidth of the PTRS waveform, or any combination thereof.

23. The method of claim 21, further comprising: outputting, to the UE, control signaling indicating an updated configuration for the PTRS waveform; outputting, within a second transmission time interval, a second PTRS waveform in accordance with the updated configuration; and outputting, within the second transmission time interval, a second data message.

24. The method of claim 21, wherein outputting the PTRS waveform further comprises: outputting the single pilot tone at a first transmit power level that exceeds a second transmit power level of the data message.

25. The method of claim 21, wherein outputting the control signaling further comprises: outputting a control message that indicates a channel comprising a subchannel for the PTRS waveform and a second subchannel for the data message.

26. The method of claim 21, wherein outputting the control signaling further comprises:outputting downlink control information (DCI) indicating the configuration for the PTRS waveform.

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