Method and apparatus for phase tracking reference signal (PTRS) allocation

Abstract

The present disclosure provides systems, methods, and apparatus, including computer programs encoded on computer storage media, for enabling a user equipment (UE) and a base station (BS) to communicate using a set of frequency resources in which a subset of the frequency resources includes phase tracking reference signals (PTRSs). In one aspect, the UE can measure the PTRSs in the subset of frequency resources and select phase noise compensation used to demodulate communications from the BS. The subset of frequency resources can be selected from the set of frequency resources based on channel conditions of different subsets of frequency resources. The BS can provide an indication of the selected subset of frequency resources to the UE, such as in control information scheduling communications from the BS.

Description

[0001] Cross-references

[0002] This patent application claims the benefit of U.S. Provisional Patent Application No. 63 / 087,151, filed October 2, 2020, entitled "FREQUENCY SELECTIVE PHASE TRACKING REFERENCE SIGNAL (PTRS) ALLOCATION," and U.S. Patent Application No. 17 / 482,100, filed September 22, 2021, entitled "FREQUENCY SELECTIVE PHASE TRACKING REFERENCE SIGNAL (PTRS) ALLOCATION," each of which is assigned to the assignee of this application. Technical Field

[0003] The following pertains to wireless communication, including the allocation of frequency selective phase tracking reference signals (PTRS).

[0004] background

[0005] Wireless communication systems are widely deployed to provide various types of communication content, such as voice, video, packet data, message sending and receiving, broadcasting, and so on. These systems can support communication with multiple users by sharing available system resources, such as time, frequency, and power. Examples of such multiple access systems include fourth-generation (4G) systems (such as Long Term Evolution (LTE) systems, LTE-A Advanced (LTE-A) systems, or LTE-A Pro systems) and fifth-generation (5G) systems, which may be referred to as NR systems. These systems can employ various technologies, such as Code Division Multiple Access (CDMA), Time Division Multiple Access (TDMA), Frequency Division Multiple Access (FDMA), Orthogonal Frequency Division Multiple Access (OFDMA), or Discrete Fourier Transform Extended Orthogonal Frequency Division Multiplexing (DFT-S-OFDM). A wireless multiple access communication system may include one or more base stations or one or more network access nodes, each of which simultaneously supports communication from multiple communication devices, which may also be referred to as User Equipment (UE).

[0006] Overview

[0007] The systems, methods, and apparatus disclosed herein each have several innovative aspects, and no single aspect is solely responsible for the desired properties disclosed herein.

[0008] One innovative aspect of the subject matter described in this disclosure can be implemented in an apparatus for wireless communication at a user equipment (UE). The apparatus may include a first interface, a second interface, and a processing system. In some implementations, the processing system may be configured to identify a set of frequency resources configured for phase tracking reference signal (PTRS) transmission. In some implementations, the first interface or the second interface may be configured to obtain control information from a base station (BS) instructing a first PTRS associated with a first communication to be transmitted using a subset of frequency resources from the set of frequency resources, wherein the first communication spans the set of frequency resources. In some implementations, the processing system may be configured to select phase noise compensation for the first communication.

[0009] Another innovative aspect of the subject matter described in this disclosure can be implemented in a method for wireless communication at a UE's device. In some implementations, the method may include: identifying a set of frequency resources configured for PTRS transmission; receiving control information from a BS indicating that a first PTRS associated with a first communication uses a subset of frequency resources from the set of frequency resources, wherein the first communication spans the set of frequency resources; and selecting phase noise compensation for the first communication.

[0010] Another innovative aspect of the subject matter described in this disclosure can be implemented in another device for wireless communication at a UE. In some implementations, the device may include means for performing the following operations: identifying a set of frequency resources configured for PTRS transmission; receiving control information from a BS instructing a first PTRS associated with a first communication to be transmitted using a subset of frequency resources from the set of frequency resources, wherein the first communication spans the set of frequency resources; and selecting phase noise compensation for the first communication.

[0011] Another innovative aspect of the subject matter described in this disclosure can be implemented in a non-transient computer-readable medium storing code for wireless communication at a device of a UE. In some implementations, the code may include instructions executable by a processor for: identifying a set of frequency resources configured for PTRS transmission; receiving control information from a BS instructing a first PTRS associated with a first communication to be transmitted using a subset of frequency resources from the set of frequency resources, wherein the first communication spans the set of frequency resources; and selecting phase noise compensation for the first communication.

[0012] In some implementations, the method, apparatus (device), and non-transient computer-readable medium may include operations, features, means, or instructions for receiving or obtaining configuration information from the BS that indicates the frequency resource set available for PTRS transmission as a number of PTRS frequency modulations per RB within the frequency resource set.

[0013] In some implementations of the methods, apparatus (devices) and non-transient computer-readable media described herein, the configuration information may provide: a set of frequency subbands as the set of frequency resources, a set of PTRS modes in at least one of these frequency subbands, or any combination thereof, and wherein the control information indicates a first frequency subband as a subset of the frequency resources and a first PTRS mode for the first PTRS.

[0014] In some implementations, the method, apparatus (device), and non-transient computer-readable medium may include operations, features, means, or instructions for receiving or obtaining a PTRS index value from the BS in the control information, and selecting a subset of frequency resources and a mode containing a resource element (RE) of the first PTRS based on the PTRS index value.

[0015] In some implementations, the method, apparatus (device), and non-transient computer-readable medium may include operations, features, means, or instructions for: identifying a resource partition indication in the control information, the resource partition indication indicating a first resource partition within a set of resource blocks (RBs) allocated for communication between the UE and the BS; identifying an offset indication in the control information, the offset indication indicating a first offset within the first resource partition; and selecting the frequency resource subset based on the first resource partition and the first offset. In some implementations, the method, apparatus (device), and non-transient computer-readable medium may include operations, features, means, or instructions for: identifying a PTRS mode indication in the control information, the PTRS mode indication indicating a resource element (RE) mode within the frequency resource subset for the first PTRS.

[0016] In some implementations, the method, apparatus (device), and non-transient computer-readable medium may include operations, features, means, or instructions for: measuring one or more reference signals from the BS, wherein the one or more reference signals span a set of frequency resources; identifying a first subset of frequency resources based on the measurement, the first subset of frequency resources having channel conditions that satisfy or exceed those of one or more other subsets of frequency resources; and transmitting an indication to the BS of the first subset of frequency resources, wherein the control information indicates that the first subset of frequency resources includes the first PTRS.

[0017] In some implementations of the methods, apparatus (devices), and non-transient computer-readable media described herein, the first PTRS includes a first number of frequency tunes within the first subset of frequency resources based on a frequency density parameter associated with the frequency resource set. In some implementations of the methods, apparatus (devices), and non-transient computer-readable media described herein, the first number of frequency tunes within the first subset of frequency resources can be power-boosted to provide a converged power level matching the total power associated with the total number of PTRS frequency tunes spanning the frequency resource set.

[0018] In some implementations, the method, apparatus (device), and non-transient computer-readable medium may include operations, features, means, or instructions for transmitting or outputting the total number of frequency modulations requested by the PTRS for the first communication based on the measurement.

[0019] In some implementations, the method, apparatus (device), and non-transient computer-readable medium may include operations, features, means, or instructions for selecting the TB size of the first communication based on an indicated transport block (TB) size or an overhead parameter used for calculating the TB size and the number of PTRS frequency modulations in the first frequency resource subset. In some implementations of the method, apparatus (device), and non-transient computer-readable medium described herein, the TB size of the first communication may be adjusted relative to the indicated TB size or the calculated TB size based on the fact that PTRS frequency modulations are transmitted only in the first frequency resource subset to account for reduced PTRS overhead. In some implementations of the method, apparatus (device), and non-transient computer-readable medium described herein, the control information indicates the TB size of the first communication, which may be adjusted for reduced PTRS overhead based on the fact that PTRS frequency modulations are transmitted only in the first frequency resource subset.

[0020] In some implementations, the method, apparatus (device), and non-transient computer-readable medium may include operations, features, means, or instructions for receiving or obtaining control signaling from the BS to activate or deactivate a PTRS frequency resource indication, wherein the control signaling may be received in one or more of Radio Resource Control (RRC) signaling or Media Access Control (MAC) control elements (CEs). In some implementations of the method, apparatus (device), and non-transient computer-readable medium described herein, the control signaling includes a threshold for activating an RB of the PTRS frequency resource indication provided by the control information.

[0021] Another innovative aspect of the subject matter described in this disclosure can be implemented in an apparatus for wireless communication at a BS. The apparatus may include a first interface, a second interface, and a processing system. In some implementations, the processing system may be configured to identify a set of frequency resources available for PTRS transmission to a UE. In some implementations, the first interface or the second interface may be configured to output control information indicating that a subset of frequency resources from the set includes a first PTRS for a first communication between the BS and the UE, wherein the first communication spans the set of frequency resources. In some implementations, the first interface or the second interface may be configured to output the first communication and the first PTRS, wherein the first PTRS is transmitted within the subset of frequency resources.

[0022] Another innovative aspect of the subject matter described in this disclosure can be implemented in a method for wireless communication at a BS device. In some implementations, the method may include: identifying a set of frequency resources available for PTRS transmission to a UE; transmitting control information to the UE indicating that a subset of frequency resources from the set includes a first PTRS for a first communication between the BS and the UE, wherein the first communication spans the set of frequency resources; and transmitting the first communication and the first PTRS to the UE, wherein the first PTRS is transmitted within the subset of frequency resources.

[0023] Another innovative aspect of the subject matter described in this disclosure can be implemented in a device for wireless communication at a BS. In some implementations, the device may include means for: identifying a set of frequency resources available for PTRS transmission to a UE; transmitting control information to the UE indicating that a subset of frequency resources from the set includes a first PTRS for a first communication between the BS and the UE, wherein the first communication spans the set of frequency resources; and transmitting the first communication and the first PTRS to the UE, wherein the first PTRS is transmitted within the subset of frequency resources.

[0024] Another innovative aspect of the subject matter described in this disclosure can be implemented in a non-transient computer-readable medium storing code for wireless communication at a BS. In some implementations, the code may include instructions executable by a processor to: identify a set of frequency resources available for PTRS transmission to a UE; transmit control information to the UE indicating that a subset of frequency resources from the set includes a first PTRS for a first communication between the BS and the UE, wherein the first communication spans the set of frequency resources; and transmit the first communication and the first PTRS to the UE, wherein the first PTRS is transmitted within the subset of frequency resources.

[0025] In some implementations, the method, apparatus (device), and non-transient computer-readable medium may include operations, features, means, or instructions for transmitting or outputting configuration information to the UE that indicates the frequency resource set available for PTRS transmission as a number of PTRS frequency modulations per RB within the frequency resource set.

[0026] In some implementations of the methods, apparatus (devices) and non-transient computer-readable media described herein, the configuration information may provide a set of frequency subbands as the set of frequency resources, a set of PTRS modes within at least one of these frequency subbands, or any combination thereof, and wherein the control information indicates a first frequency subband as a subset of the frequency resources and a first PTRS mode for the first PTRS.

[0027] In some implementations, the method, apparatus (device), and non-transient computer-readable medium may include operations, features, means, or instructions for: selecting a PTRS index value for the first PTRS based on the subset of frequency resources and a pattern of resource elements (REs) containing the first PTRS within the subset of frequency resources, and transmitting or outputting the PTRS index value to the UE in the control information.

[0028] In some implementations, the method, apparatus (device), and non-transient computer-readable medium may include operations, features, means, or instructions for: transmitting or outputting in the control information the location of the frequency resource subset as a resource partition indication and an offset indication, the resource partition indication indicating a first resource partition within a set of RBs allocated for communication between the UE and the BS, and the offset indication indicating a first offset within the first resource partition. In some implementations, the method, apparatus (device), and non-transient computer-readable medium may include operations, features, means, or instructions for: transmitting or outputting in the control information a PTRS mode indication for the RE mode of the first PTRS within the frequency resource subset.

[0029] In some implementations, the method, apparatus (device), and non-transient computer-readable medium may include operations, features, means, or instructions for selecting a first subset of frequency resources from the frequency resource set based on one or more of the following: measurement reports from the UE, one or more measurements of a UE reference signal, one or more resource allocations to one or more other UEs, or any combination thereof, the first subset of frequency resources having channel conditions that satisfy or exceed the channel conditions of one or more other subsets of frequency resources, and wherein the control information indicates that the first subset of frequency resources includes a first PTRS. In some implementations of the method, apparatus (device), and non-transient computer-readable medium described herein, the first PTRS may include a first number of frequency modulations within the first subset of frequency resources based on frequency density parameters associated with the frequency resource set.

[0030] In some implementations of the methods, apparatus (devices) described herein and non-transient computer-readable media, a first number of frequency tunes within the first subset of frequency resources may be power-boosted to provide a converged power level that matches the total power associated with the total number of PTRS frequency tunes spanning the frequency resource set.

[0031] In some implementations, the method, apparatus (device), and non-transient computer-readable medium may include operations, features, means, or instructions for receiving or obtaining from the UE an indication of the total number of frequency modulations requested by the PTRS for the first communication. In some implementations, the method, apparatus (device), and non-transient computer-readable medium may include operations, features, means, or instructions for selecting the TB size of the first communication based on the TB size indicated in the control information and the number of PTRS frequency modulations in the first frequency resource subset. In some implementations of the method, apparatus (device), and non-transient computer-readable medium described herein, the TB size of the first communication may be adjusted relative to the indicated TB size based on the fact that the PTRS frequency modulations are transmitted only in the first frequency resource subset to account for reduced PTRS overhead.

[0032] In some implementations of the methods, apparatus (devices), and non-transient computer-readable media described herein, the control information indicates the TB size of the first communication, which may be adjusted for reduced PTRS overhead based on PTRS frequency modulation being transmitted only in the first subset of frequency resources. In some implementations, the methods, apparatus (devices), and non-transient computer-readable media may include operations, features, means, or instructions for transmitting or outputting control signaling to the UE to activate or deactivate a PTRS frequency resource indication, wherein the control signaling may be transmitted in one or more of RRC signaling or MAC-CE. In some implementations of the methods, apparatus (devices), and non-transient computer-readable media described herein, the control signaling includes a threshold for activating the RB of the PTRS frequency resource indication provided by the control information.

[0033] In some implementations of the methods, apparatus (devices) and non-transient computer-readable media described herein, the first PTRS may be transmitted in a set of frequency modalities of the subset of frequency resources, and wherein different frequency modalities in the set of frequency modalities have different transmit powers based on estimated channel conditions associated with each frequency modality.

[0034] In some implementations of the methods, apparatus (devices), and non-transient computer-readable media described herein, the transmit power of the set of frequency modulations for the subset of frequency resources can be determined to provide utilization of the total available transmit power for the first PTRS. In some implementations of the methods, apparatus (devices), and non-transient computer-readable media described herein, the BS selects a PTRS mode comprising one or more zero-power frequency modulations based on the estimated channel conditions, the PTRS mode being selected from a predefined set of modes, and wherein the index of the PTRS mode can be signaled to the UE via the control information.

[0035] Details of one or more implementations of the subject matter described in this disclosure are set forth in the accompanying drawings and the following description. Other features, aspects, and advantages will become apparent from this description, the drawings, and the claims. It should be noted that the relative dimensions in the following drawings may not be drawn to scale. Brief description of the attached diagram

[0037] Figure 1 and Figure 2 An example wireless communication system supporting frequency-selective phase tracking reference signal (PTRS) allocation is shown.

[0038] Figure 3 An example set of frequency resources supporting frequency-selective PTRS allocation is shown.

[0039] Figure 4 and Figure 5An example of a PTRS resource configuration that supports frequency-selective PTRS allocation is shown.

[0040] Figure 6 An example process flow supporting frequency-selective PTRS allocation is shown.

[0041] Figure 7 and Figure 8 An example system including an example device that supports frequency-selective PTRS allocation is shown.

[0042] Figures 9 to 13 A flowchart illustrating an example method for supporting frequency-selective PTRS allocation is shown.

[0043] Similar reference numerals and naming conventions in the various figures indicate similar elements.

[0044] Detailed description

[0045] The following description is directed to certain implementations in order to illustrate the innovative aspects of this disclosure. However, those skilled in the art will readily recognize that the teachings herein can be applied in many different ways. The described implementation can be implemented in any device, system, or network capable of transmitting and receiving RF signals according to: any of the IEEE 16.11 or IEEE 802.11 standards, Bluetooth®, Code Division Multiple Access (CDMA), Frequency Division Multiple Access (FDMA), Time Division Multiple Access (TDMA), Global System for Mobile Communications (GSM), GSM / General Packet Radio Service (GPRS), Enhanced Data GSM Environment (EDGE), Terrestrial Trunking Radio (TETRA), Wideband CDMA (W-CDMA), Evolved Data Optimized (EV-DO), 1xEV-DO, EV-DO Revision A, EV-DO Revision B, High-Speed ​​Packet Access (HSPA), High-Speed ​​Downlink Packet Access (HSDPA), High-Speed ​​Uplink Packet Access (HSUPA), Evolved High-Speed ​​Packet Access (HSPA+), Long Term Evolution (LTE), AMPS, or other known signals used for communication within wireless networks, cellular networks, or Internet of Things (IoT) networks (such as systems utilizing 3G, 4G, or 5G or technologies further implemented thereto).

[0046] In some wireless communication systems, a base station (BS) may transmit one or more reference signals to assist a user equipment (UE) in demodulating and decoding transmissions. One such reference signal may be a phase tracking reference signal (PTRS) that can be used at the UE to compensate for oscillator phase noise. Oscillator phase noise can increase due to variations in the oscillator carrier frequency, and this phase noise can be mitigated using PTRS at higher carrier frequencies, such as, for example, millimeter-wave (mmW) frequencies. Phase noise compensation may incur performance losses in cases where the PTRS is subjected to interference or frequency-selective fading. In some implementations, the BS may transmit the PTRS using one or more frequency subbands, which are subsets of the total number of frequency subbands used for communication with the UE. The subset of frequency subbands may be selected as one or more subbands with relatively better channel conditions compared to other frequency subbands in the total number of frequency subbands. The BS may provide the UE with an indication of the selected one or more subbands, and the UE may measure the PTRS in the one or more indicated subbands and perform phase noise compensation based on the measured PTRS.

[0047] In some implementations, the BS can select a subset of frequency resources from a set of frequency resources configured for communication with the UE for use with PTRS. The subset of frequency resources can be, for example, one or more subbands, one or more resource element (RE) interleavings, or a combination thereof. In some implementations, the BS can make this selection based on identified channel conditions associated with each of the total number of frequency subbands used for communication with the UE, channel conditions associated with one or more RE interleavings, or any combination thereof. For example, the BS can measure one or more reference signals, such as probe reference signals (SRS), transmitted by the UE across one or more subbands. Based on the reference signal measurements, the BS can select one or more subbands or RE interleavings to carry PTRS (e.g., subbands or RE interleavings with relatively high channel gain, relatively low interference, or any combination thereof). Additionally or alternatively, the UE can measure one or more reference signals from the BS, such as channel state information reference signals (CSI-RS), and transmit measurement reports to the BS indicating measurements across multiple subbands that the BS can use to select a subset of frequency resources to carry PTRS.

[0048] In some implementations, the BS may provide an indication of a selected subset of frequency resources to carry PTRS in the control information provided to the UE. For example, this indication may be provided in a scheduled downlink control information (DCI) communication to the UE. The indication of the selected subset of frequency resources may indicate, for example, the mode or location of the PTRS within a frequency domain resource allocation of multiple configured modes or locations (e.g., dynamically selecting one of the multiple configured modes or locations using bit fields in the scheduled DCI). In some implementations, the BS may select a subset of frequency resources based on a UE request. Additionally or alternatively, the BS and UE may adjust the transport block size (TBS) for communications (such as Physical Downlink Shared Channel (PDSCH) transmissions) based on the actual number of PTRS frequency modulations in the frequency resource set. In some implementations, the BS may activate or deactivate the provision of an indication of the selected subset of frequency resources, such as through Radio Resource Control (RRC) signaling, Media Access Control (MAC) control elements (CE), or any combination thereof. Furthermore, in some implementations, the BS may allocate transmit power to different REs for PTRS based on an estimated channel.

[0049] Specific implementations of the subject matter described in this disclosure can achieve one or more of the following potential advantages. For example, phase noise compensation can be enhanced by transmitting PTRS in a selected subset of frequency resources that has enhanced channel conditions compared to other subsets of frequency resources, which can improve the communication reliability of the UE and BS. In some implementations, the selected subset of frequency resources can be efficiently signaled to the UE in control information by configuring the UE with several available PTRS locations or modes. Furthermore, such techniques can be activated based on channel conditions or specific frequency resources associated with the BS and UE by implementing the activation or deactivation of PTRS transmission in the selected subset of frequency resources. Accordingly, the BS and UE can achieve higher communication efficiency and higher reliability based on the described techniques for PTRS transmission in the selected subset of frequency resources.

[0050] Figure 1 An example of a wireless communication system 100 supporting frequency-selective PTRS allocation is shown. The wireless communication system 100 may include one or more BS 105s, one or more UEs 115s, and a core network 130. In some implementations, the wireless communication system 100 may be a Long Term Evolution (LTE) network, an Advanced LTE (LTE-A) network, an LTE-A Pro network, or a New Radio (NR) network. In some implementations, the wireless communication system 100 may support enhanced broadband communication, ultra-reliable (e.g., mission-critical) communication, low latency communication, communication with low-cost and low-complexity devices, or any combination thereof.

[0051] Each BS 105 can be distributed across a geographical area to form a wireless communication system 100, and can be different types of devices or devices with different capabilities. BS 105 and UE 115 can perform wireless communication via one or more communication links 125. Each BS 105 can provide a coverage area 110, on which UE 115 and BS 105 can establish one or more communication links 125. Coverage area 110 can be an example of a geographical area over which BS 105 and UE 115 can support signal communication according to one or more radio access technologies.

[0052] Each UE 115 can be distributed throughout the coverage area 110 of the wireless communication system 100, and each UE 115 can be stationary or mobile, or stationary and mobile at different times. Each UE 115 can be a different type of device or a device with different capabilities. Figure 1 This document describes some example UE 115s. The UE 115s described herein can communicate with various types of devices, such as other UE 115s, BS 105s, or network equipment (such as core network nodes, relay equipment, integrated access and backhaul (IAB) nodes, or other network equipment). Figure 1 As shown in the image.

[0053] Each BS 105 can communicate with the core network 130, communicate with each other, or both. For example, BS 105 can interface with the core network 130 via one or more backhaul links 120 (such as via S1, N2, N3, or another interface). BS 105 can communicate with each other directly (such as directly between BS 105) or indirectly (such as via the core network 130), or both, on backhaul links 120 (such as via X2, Xn, or other interfaces). In some implementations, backhaul link 120 can be or includes one or more radio links.

[0054] One or more of the BS 105 described herein may include, or may be referred to by those skilled in the art as, base transceiver station, radio base station, access point, radio transceiver, B node, evolved B node (eNB), next-generation B node or gigabit B node (any of which may be referred to as gNB), home B node, home evolved B node, or other suitable terms.

[0055] UE 115 may include or be referred to as a mobile device, wireless device, remote device, handheld device, or subscriber device, or any other suitable term, wherein "device" may also be referred to as a unit, station, terminal, or client, etc. UE 115 may also include or be referred to as a personal electronic device, such as a cellular phone, personal digital assistant (PDA), tablet computer, laptop computer, or personal computer. In some implementations, UE 115 may include or be referred to as a wireless local loop (WLL) station, Internet of Things (IoT) device, Internet of Everything (IoE) device, or machine-type communication (MTC) device, which may be implemented in various objects such as appliances or vehicles, meters, etc.

[0056] The UE 115 described herein can communicate with various types of devices, such as other UE 115s that sometimes act as relays, as well as BS 105s and network equipment including macro eNBs or gNBs, small cell eNBs or gNBs, or relay base stations, etc. Figure 1 As shown in the image.

[0057] UE 115 and BS 105 can wirelessly communicate with each other via one or more communication links 125 on one or more carriers. The term "carrier" can refer to a set of radio frequency spectrum resources having a defined physical layer structure for supporting communication link 125. For example, a carrier for communication link 125 may include a portion of the radio spectrum band (such as a bandwidth portion (BWP)) operating according to one or more physical layer channels for a given radio access technology (such as LTE, LTE-A, LTE-A Pro, NR). Each physical layer channel may carry acquisition signaling (such as synchronization signals, system information), control signaling coordinating carrier operation, user data, or other signaling. Wireless communication system 100 may support communication with UE 115 using carrier aggregation or multi-carrier operation. UE 115 may be configured to have multiple downlink component carriers and one or more uplink component carriers according to a carrier aggregation configuration. Carrier aggregation can be used in conjunction with both frequency division duplex (FDD) and time division duplex (TDD) component carriers.

[0058] The signal waveform transmitted on a carrier may include multiple subcarriers (such as those using multi-carrier modulation (MCM) techniques, such as Orthogonal Frequency Division Multiplexing (OFDM) or Discrete Fourier Transform Extended OFDM (DFT-S-OFDM)). In systems employing MCM, a resource element may include a symbol period (such as the duration of a modulation symbol) and a subcarrier, where the symbol period and subcarrier spacing are inversely related. The number of bits carried by each resource element may depend on the modulation scheme (such as the order of the modulation scheme, the coding rate of the modulation scheme, or both). Therefore, the more resource elements the UE 115 receives and the higher the order of the modulation scheme, the higher the data rate the UE 115 can achieve. Wireless communication resources can refer to a combination of radio frequency spectrum resources, temporal resources, and spatial resources (such as spatial layers or beams), and using multiple spatial layers can further improve the data rate or data integrity of communication with the UE 115.

[0059] The time intervals of BS 105 or UE 115 can be expressed as multiples of a basic time unit, such as the sampling period. T s =1 ( Δf max N f ) seconds, of which Δf max This can represent the maximum supported subcarrier spacing, while N f This can represent the maximum supported Discrete Fourier Transform (DFT) size. The time interval of communication resources can be organized according to radio frames, each with a specific duration (such as 10 milliseconds (ms)). Each radio frame can be identified by a System Frame Number (SFN) (such as ranging from 0 to 1023).

[0060] Each frame may include multiple consecutively numbered subframes or time slots, and each subframe or time slot may have the same duration. In some implementations, a frame may be divided into subframes (e.g., in the time domain), and each subframe may be further divided into several time slots. Alternatively, each frame may include a variable number of time slots, and the number of time slots may depend on the subcarrier spacing. Each time slot may include several symbol periods (e.g., depending on the length of the cyclic prefix added before each symbol period). In some wireless communication systems 100, a time slot may be further divided into multiple mini-time slots containing one or more symbols. Excluding the cyclic prefix, each symbol period may contain one or more ( N f Sampling period. The duration of the symbol period can depend on the subcarrier spacing or the operating frequency band.

[0061] A subframe, time slot, mini-time slot, or symbol can be the smallest scheduling unit of the wireless communication system 100 (e.g., in the time domain) and can be referred to as a transmission time interval (TTI). In some implementations, the duration of the TTI (such as the number of symbol periods in the TTI) can be variable. Additionally or alternatively, the smallest scheduling unit of the wireless communication system 100 can be dynamically selected (e.g., in bursts of shortened TTIs (sTTIs)).

[0062] Physical channels can be multiplexed on a carrier using various techniques. Physical control channels and physical data channels can be multiplexed on a downlink carrier, for example, using one or more of Time Division Multiplexing (TDM), Frequency Division Multiplexing (FDM), or a hybrid TDM-FDM technique. Control regions (such as control resource sets (CORESET)) used for physical control channels can be defined by the number of symbol periods and can extend across the system bandwidth or a subset of the system bandwidth of the carrier. One or more control regions (such as CORESET) can be configured for a set of UEs 115. For example, one or more UEs 115 can monitor or search control regions for control information based on one or more search space sets, and each search space set can include one or more control channel candidates in one or more aggregation levels arranged in a cascaded manner. The aggregation level for control channel candidates can refer to the number of control channel resources (such as control channel elements (CCE)) associated with coded information for a control information format having a given payload size. The search space set may include a common search space set configured to send control information to multiple UEs 115 and a UE-specific search space set configured to send control information to a specific UE 115.

[0063] Each BS 105 may provide communication coverage via one or more cells (e.g., macrocells, small cells, hotspots, or other types of cells, or any combination thereof). The term "cell" may refer to a logical communication entity used to communicate with the BS 105 (e.g., on a carrier) and may be associated with an identifier used to distinguish adjacent cells (e.g., Physical Cell Identifier (PCID), Virtual Cell Identifier (VCID), or others). In some implementations, a cell may also refer to a geographic coverage area 110 or a portion of geographic coverage area 110 (e.g., a sector) on which a logical communication entity operates. The extent of such cells may vary from smaller areas (e.g., structures, subsets of structures) to larger areas depending on various factors (e.g., the capabilities of the BS 105). For example, a cell may be or include buildings, subsets of buildings, or external space between or overlapping geographic coverage areas 110, among other examples.

[0064] Macrocells typically cover a relatively large geographic area (e.g., a radius of several kilometers) and allow unrestricted access for UE 115s with service subscriptions to network providers supporting macrocells. Small cells may be associated with lower-power BS 105s (compared to macrocells) and may operate in the same or different frequency bands, licensed or unlicensed bands as macrocells. Small cells may provide unrestricted access to UE 115s with service subscriptions to network providers, or restricted access to UE 115s associated with small cells (e.g., UE 115s in a Closed Subscriber Group (CSG), or UE 115s associated with users in a home or office). BS 105 may support one or more cells and may also support communication on one or more cells using one or more component carriers.

[0065] In some implementations, a carrier can support multiple cells and can be configured with different cells depending on the different protocol types that can provide access for different types of devices, such as MTC, narrowband IoT (NB-IoT), or enhanced mobile broadband (eMBB) .

[0066] In some implementations, the BS 105 can be mobile, and thus provide communication coverage to mobile geographic coverage areas 110. In some implementations, different geographic coverage areas 110 associated with different technologies may overlap, but the different geographic coverage areas 110 may be supported by the same BS 105. In other implementations, overlapping geographic coverage areas 110 associated with different technologies may be supported by different BS 105s. The wireless communication system 100 may include, for example, a heterogeneous network, in which different types of BS 105s use the same or different radio access technologies to provide coverage to various geographic coverage areas 110.

[0067] Some UEs 115 can be configured to operate in reduced-power modes, such as half-duplex communication (e.g., a mode that supports unidirectional communication via transmission or reception but not simultaneous transmission and reception). In some implementations, half-duplex communication can be performed at reduced peak rates. Other power-saving techniques for UEs 115 include entering a power-saving deep sleep mode when not engaged in active communication, operating on limited bandwidth (e.g., according to narrowband communication), or a combination of these techniques. For example, some UEs 115 can be configured to operate using a narrowband protocol type associated with a defined portion or range (e.g., subcarriers or resource block (RB) set) within the carrier, within the carrier's guard band, or outside the carrier.

[0068] Wireless communication system 100 may be configured to support ultra-reliable communication or low latency communication, or various combinations thereof. For example, wireless communication system 100 may be configured to support ultra-reliable low latency communication (URLLC) or mission-critical communication. UE 115 may be designed to support ultra-reliable, low latency, or mission-critical functions (such as mission-critical functions). Ultra-reliable communication may include private or group communication and may be supported by one or more mission-critical services (such as Mission-Critical Talk-to-Talk (MCPTT), Mission-Critical Video (MCVideo), or Mission-Critical Data (MCData)). Support for mission-critical functions may include prioritization of services, and mission-critical services may be used for public safety or general commercial applications. The terms ultra-reliable, low latency, mission-critical, and ultra-reliable low latency are used interchangeably herein.

[0069] In some implementations, UE 115 may also be able to communicate directly with other UE 115s on D2D communication link 135 (e.g., using peer-to-peer (P2P) or D2D protocols). One or more UE 115s utilizing D2D communication may be within the geographic coverage area 110 of BS 105. Other UE 115s in this group may be outside the geographic coverage area 110 of BS 105 or may be unable to receive transmissions from BS 105 for other reasons. In some implementations, groups of UE 115s communicating via D2D communication may utilize a one-to-many (1:M) system, where each UE 115 transmits to every other UE 115 in the group. In some implementations, BS 105 facilitates the scheduling of resources for D2D communication. In other cases, D2D communication is performed between the individual UE 115s without involving BS 105.

[0070] In some systems, the D2D communication link 135 may be an example of a communication channel (such as a sidelink communication channel) between vehicles (such as UE 115). In some implementations, vehicles may communicate using vehicle-to-everything (V2X) communication, vehicle-to-vehicle (V2V) communication, or some combination of these communications. Vehicles may signal information related to traffic conditions, signaling, weather, safety, emergencies, or any other information relevant to the V2X system. In some implementations, vehicles in a V2X system may communicate with roadside infrastructure (such as roadside units), or with the network, or with both, via vehicle-to-network (V2N) communication through one or more network nodes (such as BS 105).

[0071] Core network 130 provides user authentication, access authorization, tracking, Internet Protocol (IP) connectivity, and other access, routing, or mobility functions. Core network 130 can be an evolved packet core (EPC) or a 5G core (5GC). The EPC or 5GC may include at least one control plane entity (such as a Mobility Management Entity (MME), Access and Mobility Management Function (AMF)) managing access and mobility, and at least one user plane entity (such as a Serving Gateway (S-GW), Packet Data Network (PDN) Gateway (P-GW), or User Plane Function (UPF)) routing packets or interconnecting to external networks. The control plane entity manages non-access stratum (NAS) functions, such as mobility, authentication, and bearer management for UE 115 served by BS 105 associated with core network 130. User IP packets can be delivered through a user plane entity, which provides IP address allocation and other functions. The user plane entity may be connected to one or more network operator IP services 150. The IP service 150 may include access to the Internet, intranet, IP Multimedia Subsystem (IMS), or packet-switched streaming services.

[0072] Some network devices (such as BS 105) may include sub-components, such as access network entity 140, which may be an example of an access node controller (ANC). Each access network entity 140 may communicate with each UE 115 through one or more other access network transport entities 145, which may be referred to as a radio headend, smart radio headend, or transmit / receive point (TRP). Each access network transport entity 145 may include one or more antenna panels. In some configurations, the various functions of each access network entity 140 or BS 105 may be distributed across various network devices (such as radio headends and ANCs) or combined into a single network device (such as BS 105).

[0073] Wireless communication system 100 can operate using one or more frequency bands, typically in the range of 300 MHz to 300 GHz. Generally, the 300 MHz to 3 GHz band is referred to as a UHF band or decimeter band because the wavelengths range from approximately 1 decimeter to 1 meter. UHF waves can be blocked or redirected by buildings and environmental features, but these waves can penetrate various structures sufficiently for macrocells to provide service to UE 115 located indoors. Compared to transmissions using smaller frequencies and longer waves in the lower HF or VHF portions of the spectrum below 300 MHz, UHF wave transmission can be associated with smaller antennas and shorter ranges (e.g., less than 100 km).

[0074] Wireless communication system 100 may utilize both licensed and unlicensed radio spectrum bands. For example, wireless communication system 100 may employ licensed assisted access (LAA), LTE unlicensed (LTE-U) radio access technology, or NR technology in unlicensed frequency bands (such as the 5 GHz Industrial, Scientific, and Medical (ISM) band). When operating in unlicensed radio spectrum bands, devices (such as BS 105 and UE 115) may employ carrier sensing for collision detection and avoidance. In some implementations, operation in unlicensed frequency bands may be coordinated with component carriers operating in licensed frequency bands based on carrier aggregation configurations (such as LAA). Operation in unlicensed spectrum may include downlink transmissions, uplink transmissions, P2P transmissions, or D2D transmissions, etc.

[0075] BS 105 or UE 115 may be equipped with multiple antennas that can be used to employ techniques such as transmit diversity, receive diversity, multiple-input multiple-output (MIMO) communication, or beamforming. The antennas of BS 105 or UE 115 may be located within one or more antenna arrays or antenna panels that can support MIMO operation or transmit or receive beamforming. For example, one or more BS antennas or antenna arrays may coexist at an antenna assembly (such as an antenna tower). In some implementations, the antennas or antenna arrays associated with BS 105 may be located in a variety of geographical locations. BS 105 may have an antenna array with several rows and columns of antenna ports that BS 105 can use to support beamforming for communication with UE 115. Similarly, UE 115 may have one or more antenna arrays that can support various MIMO or beamforming operations. Additionally or alternatively, the antenna panel may support radio frequency beamforming for signals transmitted via the antenna ports.

[0076] Beamforming (also known as spatial filtering, directional transmission, or directional reception) is a signal processing technique that can be used at a transmitting or receiving device (e.g., BS 105, UE 115) to shape or guide an antenna beam (such as a transmit beam or receive beam) along a spatial path between the transmitting and receiving devices. Beamforming can be achieved by combining signals transmitted via antenna elements of an antenna array, such that some signals propagating relative to a particular orientation of the antenna array experience constructive interference, while others experience destructive interference. Adjustments to the signals transmitted via the antenna elements may include the transmitting or receiving device applying amplitude offset, phase offset, or both to the signals carried via the antenna elements associated with that device. The adjustments associated with each antenna element may be defined by a beamforming weight set associated with a particular orientation (such as the antenna array relative to the transmitting or receiving device, or relative to some other orientation).

[0077] Wireless communication system 100 can be a packet-based network operating according to a layered protocol stack. In the user plane, communication at the bearer or Packet Data Convergence Protocol (PDCP) layer can be IP-based. The Radio Link Control (RLC) layer performs packet segmentation and reassembly for communication on logical channels. The MAC layer performs priority handling and multiplexing of logical channels into transport channels. The MAC layer can also use error detection, error correction, or both to support MAC layer retransmissions to improve link efficiency. In the control plane, the Radio Resource Control (RRC) protocol layer can provide the establishment, configuration, and maintenance of RRC connections between UE 115 and BS 105 or core network 130 supporting user plane data radio bearers. At the physical layer, transport channels can be mapped to physical channels.

[0078] UE 115 and BS 105 can support data retransmission to increase the likelihood of successful data reception. Hybrid Automatic Repeat Request (HARQ) feedback is a technique used to increase the likelihood of correctly receiving data on communication link 125. HARQ may include a combination of error detection (e.g., using Cyclic Redundancy Check (CRC)), forward error correction (FEC), and retransmission (such as Automatic Repeat Request (ARQ)). HARQ can improve MAC layer throughput under adverse radio conditions (such as low signal-to-noise ratio conditions). In some implementations, the device may support simultaneous time-slot HARQ feedback, where the device can provide HARQ feedback in a specific time slot for data received in previous symbols within that time slot. In other cases, the device may provide HARQ feedback in subsequent time slots or according to some other time interval.

[0079] In some implementations, BS 105 may be configured to provide phase noise-compensated PTRS transmission at UE 115. In some implementations, BS 105 may use a subset of frequency resources from the set of frequency resources used for communication between UE 115 and BS 105 to transmit PTRS, such as one or more frequency subbands that are a subset of the total number of frequency subbands used for communication between UE 115 and BS 105. The frequency resource subset may be selected as one or more frequency resources (such as frequency subbands) that have relatively better channel conditions compared to other frequency resources in the total number of frequency subbands.

[0080] In some implementations, BS 105 may provide UE 115 with an indication of a selected subset of frequency resources, and UE 115 may measure the PTRS in that subset of frequency resources and use the PTRS measurement to perform phase noise compensation. In some implementations, BS 105 may select a subset of frequency resources based on identified channel conditions associated with each different subset of frequency resources in the frequency resource set used for communication with UE 115, channel conditions associated with one or more RE interleavings, or any combination thereof. For example, channel conditions may be determined at least in part based on one or more of SRS measurements across different subsets of frequency resources performed by BS 105, measurement reports (such as CSI reports) provided by UE 115, or any combination thereof. In some implementations, BS 105 may provide the UE with an indication of a selected subset of frequency resources in the scheduling DCI.

[0081] Figure 2 An example of a wireless communication system 200 supporting frequency-selective PTRS allocation has been explained. In some examples, wireless communication system 200 may implement aspects of wireless communication system 100. Wireless communication system 200 includes BS 105-a and UE115-a, which may be references. Figure 1 Examples of the corresponding devices described.

[0082] BS 105-a and UE 115-a can communicate via downlink communication link 205 and uplink communication link 210. In some implementations, BS 105-a can configure UE 115-a for communication via at least a portion of the configuration provided by configuration message 215. Configuration message 215 can provide information related to the set of frequency resources configured for communication, such as several frequency sub-bands configured in one or more carriers used in downlink communication link 205 and uplink communication link 210. In some implementations, BS 105-a can be configured to carry multiple component carriers for communication between UE 115-a and BS 105-a.

[0083] In some implementations, configuration message 215 may also provide indications of PTRS parameters configured for the frequency resource set. For example, configuration message 215 may provide the time and frequency density for PTRS transmissions 225 across the frequency resource set. In some implementations, the time density may be indicated as one PTRS transmission 225 per several PDSCH symbols (e.g., based on a parameter L indicating one PTRS per PDSCH symbol, one PTRS per two PDSCH symbols, or one PTRS per four PDSCH symbols). In some implementations, the frequency density may be indicated as the number of PTRS frequency modulations per resource block (RB) (e.g., based on a parameter K indicating the number of PTRS frequency modulations per RB). In some implementations, configuration message 215 may include a threshold for activating RBs indicated by the PTRS resource provided by scheduling DCI 220 (e.g., if the number of configured RBs for communication is less than the threshold, PTRS transmission 225 is provided across all RBs, and if the number of configured RBs is at least the threshold, scheduling DCI 220 may provide an indication of a subset of frequency resources including PTRS transmission 225).

[0084] As described herein, in some implementations, a subset of frequency resources from a set of frequency resources may be selected for PTRS transmission 225. In some implementations, the subset of frequency resources may be selected at BS 105-a based on channel conditions associated with each of several different subsets of frequency resources. Channel conditions may be determined based on one or more reference signal measurements at BS 105-a, UE 115-a, or any combination thereof. Measurements performed at UE 115-a may include, for example, channel measurements of CSI-RS reported to BS 105-a in measurement report 235, which in some cases may be transmitted along with PTRS request information. PTRS request information may include, for example, a requested PTRS time density, a requested PTRS frequency density, a requested subset of frequency resources for PTRS transmission 225, or any combination thereof. Measurements performed at BS 105-a may include channel measurements of SRS 230 transmitted by UE 115-a. Additionally or alternatively, BS 105-a may select a subset of frequency resources at least in part based on resource allocation for different UEs, which may allow BS 105-a to estimate the amount of interference that may occur at different subsets of frequency resources (e.g., interference estimates at different frequency modulations in frequency modulation groups within a frequency resource set).

[0085] In some implementations, BS 105-a may signal a selected subset of frequency resources in the scheduling DCI 220 transmitted to UE 115-a. The selected subset of frequency resources may be determined as, for example, a frequency subband with the highest measured channel gain, a frequency subband with the lowest measured interference, RE interleaving with the lowest measured interference, or any combination thereof. In some implementations, configuration message 215 may provide information relating to multiple PTRS modes, multiple PTRS locations, or combinations thereof within the configured set of frequency resources allocated in the frequency domain, and scheduling DCI 220 may provide an indication of which mode, location, or combination thereof has been selected. In some implementations, scheduling DCI 220 may include bit fields used to signal the selected subset of frequency resources, based on mode, location, or both. For example, scheduling DCI 220 may provide index values ​​to a table of different combinations of modes, locations, and frequency subbands available for PTRS transmission 225. In some implementations, this table may be configured, for example, via RRC signaling or via MAC-CE. In some implementations, the set of modes and locations used for PTRS transmission 225 may depend on RB allocation, modulation and coding scheme (MCS), one or more other communication parameters (such as frequency band) for downlink communication, or any combination thereof.

[0086] For example, configuration message 215 may provide an indication of the total RB allocation for PDSCH communication with UE 115-b. The total RB allocation may be divided into, for example, four blocks or resource partitions, and PTRS transmission 225 will be sent on a specific block or resource partition with acceptable channel conditions. In such implementations, scheduling DCI 220 may include an index value (such as a two-bit indication) of the selected block or resource partition. Additionally, in some implementations, scheduling DCI 220 may provide an offset selectable from several different pre-configured offsets, which may be selected to ensure that PTRS transmission 225 has optimal channel conditions through the selected block. In some implementations, the index of the offset may also be provided in scheduling DCI 220. Different modes of PTRS transmission 225 may be sent evenly within a selected subset of frequency resources (such as...). Figure 4 (as illustrated in the example) or can be sent as a clustered transmission (such as...) Figure 5 (As explained in the example).

[0087] In some implementations, UE 115-a may transmit a measurement report 235 that also indicates one or more PTRS requests. For example, such a PTRS request may be based on CSI-RS measurements at UE 115-a and may include a requested subset of frequency resources, a requested time density, a requested frequency density, a requested cluster configuration, or any combination thereof, for PTRS transmission 225. In such implementations, BS 105-a may select the subset of frequency resources, as well as the time density and frequency density, for PTRS transmission 225 based on the request from UE 115-a. In some implementations, the number of PTRS frequency tunes transmitted may be selected to maintain the total number of frequency tunes in cases where PTRS transmission 225 is transmitted on the frequency resource set according to a frequency density parameter (e.g., frequency density parameter K). In some other implementations, the number of PTRS frequency tunes transmitted may be selected as the requested number of frequency tunes from UE 115-a. In some other implementations, the number of transmitted PTRS frequency moduli can use frequency density on a selected subset of frequency resources (e.g., selected blocks), and BS 105-a can boost the power of the transmitted PTRS frequency moduli to match the total power that would exist if PTRS transmission 225 were transmitted through the entire set of frequency resources, not just a subset. This power boost can further enhance the PTRS channel quality at UE 115-a and thus further enhance phase noise compensation at UE 115-a.

[0088] Additionally or alternatively, in some implementations, the TBS of communication (e.g., PDSCH TBS) may be adjusted or scaled based on the actual PTRS overhead of PTRS transmission 225. In such implementations, the overhead value may be used for TBS calculation across a set of frequency resources using a certain PTRS frequency modulation density. However, the actual number of PTRS frequencies to be transmitted may be based on a subset of frequency resources, and the adjustment or scaling of the TBS may be based on the difference between the number of PTRS frequencies used in the overhead value and the actual number of PTRS frequencies transmitted. In some implementations, BS 105-a may use an overhead value different from the value configured by RRC for TBS calculation, and this different overhead value may also be signaled to UE 115-a in the scheduling DCI 220.

[0089] Additionally or alternatively, in some implementations, BS 105-a can activate or deactivate PTRS transmissions 225 using only a subset of frequency resources. For example, it can be determined that the channel conditions across the frequency resource set are relatively uniform such that PTRS transmissions 225 using only a subset of frequency resources will not significantly enhance phase noise compensation, and adaptive PTRS allocation for the only frequency resource subset can be deactivated. Similarly, if it is determined that PTRS transmissions using a subset of frequency resources may enhance phase noise compensation, adaptive PTRS allocation for the only frequency resource subset can be activated. In some implementations, activation or deactivation can be indicated via RRC signaling, MAC-CE, or any combination thereof.

[0090] In some implementations, based on the estimated channel used for PTRS transmission 225, BS 105-a may allocate different transmit powers for different REs containing PTRS. For example, based on the actual transmitted PTRS frequency modulus, BS 105-a may determine the transmit power of that PTRS frequency modulus so that the total capacity of that PTRS frequency modulus is enhanced, and a first number of PTRS frequency modulus within a subset of frequency resources are power-up to provide a pooled power level that matches the total power associated with the total number of PTRS frequency modulus spanning the same set of frequency resources. In some implementations, BS 105-a may select a PTRS mode including one or more zero-power frequency modulus based on estimated channel conditions (e.g., the PTRS mode is selected from a predefined set of modes, and the index of the mode is signaled to UE 115-a via scheduling DCI 220).

[0091] Figure 3 An example frequency resource set 300 supporting frequency-selective PTRS allocation is shown. In some examples, frequency resource set 300 can implement... Figure 1 and 2 The various aspects of the wireless communication system 100 or 200 depicted and described herein. Figure 3 In the example, frequency resource set 300 may include frequency subband set 305. Frequency subband set 305 may include, for example, subbands in the mmW frequency resource set allocated for communication between the UE and the BS.

[0092] In some implementations, the frequency sub-band set 305 may include a first sub-band 310, a second sub-band 315 through an Nth sub-band 320. As discussed herein, one or more of the frequency sub-bands 305 may have more favorable or less favorable channel conditions for PTRS transmission, and PTRS transmission can be enhanced by providing PTRS transmission in a subset of the frequency sub-bands 305 with more favorable channel conditions. For example, this determination may be made based on one or more channel measurements of a reference signal transmitted and spanning the frequency sub-band set 305. Figure 3In this example, the second subband 310 can be identified as a subset of frequency resources with relatively good channel conditions. Therefore, in this example, the second subband 310 can be selected for PTRS transmission, and PTRS transmissions that would otherwise use other subbands in the frequency subband set 305 can be cancelled.

[0093] Figure 4 Two examples of PTRS resource configuration 400 supporting frequency-selective PTRS allocation are shown. In some examples, PTRS resource configuration 400 can implement aspects of the wireless communication system 100 or 200 as described herein. (See reference...) Figure 2 In some implementations, the PTRS configuration discussed may provide an indication of the time density of the PTRS, the frequency density of the PTRS, or a combination thereof.

[0094] exist Figure 4 In the example, the PTRS configuration may include a parameter L for time density and a parameter K for frequency density. In some implementations, the available values ​​of the defined plurality of L may include L=1, indicating that PTRS is transmitted in each symbol 420 including PDSCH 440, L=2, indicating that PTRS is transmitted on one symbol 420 of every two PDSCH 440 symbols, or L=4, indicating that PTRS is transmitted on one symbol 420 of every four PDSCH 440 symbols. Furthermore, the available values ​​of the defined plurality of K may include K=4, indicating that one PTRS FM 425 is transmitted every four RBs, or K=2, indicating that one PTRS FM 425 is transmitted every two RBs.

[0095] exist Figure 4In the first example 405, a PTRS configuration with K=2 and L=1 is provided, resulting in a resource subset 415 comprising a first PTRS frequency modulation 425-a and a second PTRS frequency modulation 425-b, which includes PTRS 430 transmission in each symbol 420 having a PDSCH 440 RE. Resource subset 415 also includes demodulation reference signal (DMRS) 435 resources and PDSCH 440 resources. In the second example 410, a PTRS configuration with K=2 and L=2 is provided, resulting in a resource subset 415 comprising a first PTRS frequency modulation 425-a and a second PTRS frequency modulation 425-b, which includes PTRS 430 transmission in every two symbols 420 having a PDSCH 440 RE. In some implementations, the PTRS configuration can be configured in a configuration message and can be repeated across all frequency resource subsets of the frequency resource set. According to the techniques discussed herein, resource subset 415 can be indicated to the UE, and the PTRS configuration within resource subset 415 can be used for PTRS 430 transmitted by the base station and for PTRS 430 monitored by the UE. Numerous other examples of PTRS configurations may exist, and Figure 4 The examples provided are for discussion and illustrative purposes only, and other examples of PTRS configurations for subsets of frequency resources are within the scope of this disclosure.

[0096] Figure 5 Two additional examples of a PTRS resource configuration 500 supporting frequency-selective PTRS allocation are shown. In some examples, the PTRS resource configuration 500 can implement aspects of the wireless communication systems 100 or 200 as described herein. (See reference...) Figure 2 In some implementations, as discussed, a PTRS configuration indicating the PTRS frequency modulation cluster within a subset 515 of frequency resources may be provided. Figure 5 In the example, PTRS 530 transmissions can occur in each frequency modulation and each symbol 520 of a PTRS frequency modulation cluster 525 with PDSCH 540 resources.

[0097] In the first example 505, multiple PTRS frequency modulation clusters 525 may exist within a frequency resource subset 515. In this example, a first PTRS frequency modulation cluster 525-a and a second PTRS frequency modulation cluster 525-b may be defined within the frequency resource subset 515. In the second example 510, a single PTRS frequency modulation cluster 525-c may be defined within the frequency resource subset 515. The frequency resource subset 515 also includes demodulation reference signal (DMRS) 535 resources. In some implementations, the PTRS configuration may be configured in a configuration message and may be repeated across all frequency resource subsets 515 of the frequency resource set. According to the techniques discussed herein, the frequency resource subset 515 may be indicated to the UE, and the PTRS configuration within the frequency resource subset 515 may be used for transmitting PTRS 530 by the base station and for monitoring PTRS 530 by the UE. Numerous other examples of PTRS frequency modulation cluster configurations may exist, and Figure 5 The examples provided are for discussion and illustrative purposes only, and other examples of PTRS configurations for subsets of frequency resources are within the scope of this disclosure.

[0098] Figure 6 An example process flow 600 supporting frequency-selective PTRS allocation is shown. In some implementations, process flow 600 may be implemented by aspects of wireless communication system 100 or 200, or may be implemented by aspects of wireless communication system 100 or 200. In one aspect, process flow 600 may include example operations associated with UE 115-b and BS 105-b. In the following description of process flow 600, the operations between UE 115-b and BS 105-b may be performed in a different order than the example order shown, or the operations performed by UE 115-b and BS 105-b may be performed in a different order or at different times. Some operations may also be omitted from process flow 600, and other operations may be added to process flow 600.

[0099] In some implementations, at 605, BS 105-b may optionally transmit configuration information to UE 115-b. The configuration information may include, for example, a set of frequency resources configured for communication between UE 115-b and BS 105-b. The configuration information may also include information relating to several available PTRS modes, locations, or combinations thereof that can be selected for PTRS transmission. Additionally or alternatively, the configuration information may include activation or deactivation indications that activate or deactivate adaptive PTRS transmissions using a subset of frequency resources as described herein. The configuration information may be provided in RRC signaling, in MAC-CE, in other downlink signaling, or in any combination thereof.

[0100] In some implementations, at 610, BS 105-b may transmit CSI-RS to UE 115-b. At 615, in some implementations where BS 105-b transmits CSI-RS, UE 115-b may measure CSI-RS across multiple subbands. In some implementations, the multiple subbands may correspond to a set of frequency resources configured for communication between UE 115-b and BS 105-b. In some implementations, at 620, UE 115-b may transmit a measurement report to BS 115-b. The measurement report may include channel measurements based on CSI-RS across multiple subbands and may be used to select a specific subband with more favorable channel conditions than other subbands among those multiple subbands. Additionally or alternatively, at 625, UE 115-b may transmit SRS across those multiple subbands. In some implementations, BS 105-b may measure SRS from UE 115-b and determine the channel conditions of different subbands.

[0101] At 630, BS 105-b can allocate PDSCH resources across this frequency resource set. At 635, BS 105-b selects a subset of frequency resources to be used for PTRS transmission. In some implementations, the selection of the frequency resource subset may be based on SRS-based channel measurements at BS 105-b, measurement reports received from UE 115-b, scheduling parameters for one or more other UEs served by BS 105-b, or any combination thereof. In some implementations, at 640, BS 105-b selects the TBS for the PDSCH based on the signaled overhead value and the frequency resource subset used for PTRS transmission.

[0102] In 645, BS 105-b can transmit a scheduling DCI to UE 115-b. The scheduling DCI may include an indication of a subset of resources to be included in PTRS transmissions. In some implementations, the subset of resources may be indicated in a bit field within the scheduling DCI, which provides an index value to a pre-configured PTRS mode or location set, or both.

[0103] At 650, UE 115-b can identify a subset of resources that includes PTRS transmissions. In some implementations, UE 115-b can identify the resource subset based on an index value provided in the scheduling DCI. At 650, BS 105-b can transmit PDSCH. PDSCH can be transmitted using a set of frequency resources and may include PTRS transmissions located within the subset of frequency resources, as indicated in the scheduling DCI.

[0104] At 660, UE 115-b can select phase noise compensation based on the PTRS transmission in the frequency resource subset. In some implementations, UE 115-b can select the TBS for the PDSCH based on the PTRS overhead and the actual PTRS transmission in the frequency resource subset. At 670, UE 115-b can demodulate and decode the PDSCH based on the selected phase noise compensation.

[0105] Figure 7 A diagram of a system 700 including an example device 705 supporting frequency-selective PTRS allocation is shown. Device 705 may be an example of UE 115 as described herein or include its components. Device 705 may include components for bidirectional voice and data communication, including components for transmitting and receiving communications, including a communication manager 710, an input / output (I / O) controller 715, a transceiver 720, an antenna 725, a memory 730, and a processor 740. These components may be in electronic communication via one or more buses (e.g., bus 745).

[0106] The communication manager 710 can identify a set of frequency resources configured for PTRS transmission. The communication manager 710 can receive control information from the BS instructing a first PTRS associated with a first communication to use a subset of frequency resources from the set of frequency resources, wherein the first communication spans the set of frequency resources. The communication manager 710 can select phase noise compensation for the first communication based on the first PTRS.

[0107] In some implementations, when used as a processor or processing system, the communication manager 710 can use a first interface to obtain signaling from a receiver (such as transceiver 720), and can use the first interface or a second interface to output signaling for transmission via a transmitter (such as transceiver 720).

[0108] I / O controller 715 manages the input and output signals of device 705. I / O controller 715 can also manage peripheral devices not integrated into device 705. In some implementations, I / O controller 715 may represent a physical connection or port to an external peripheral device. In some implementations, I / O controller 715 may utilize an operating system such as iOS®, ANDROID®, MS-DOS®, MS-WINDOWS®, OS / 2®, UNIX®, LINUX®, or another known operating system. In some other examples, I / O controller 715 may represent or interact with a modem, keyboard, mouse, touchscreen, or similar device. In some implementations, I / O controller 715 may be implemented as part of a processor. In some implementations, a user may interact with device 705 via I / O controller 715 or via hardware components controlled by I / O controller 715.

[0109] Transceiver 720 can communicate bidirectionally via one or more antennas, wired or wireless links, as described herein. For example, transceiver 720 may represent a wireless transceiver and be able to communicate bidirectionally with another wireless transceiver. Transceiver 720 may also include a modem to modulate packets and provide the modulated packets to the antenna for transmission, and to demodulate packets received from the antenna.

[0110] In some implementations, the wireless device may include a single antenna 725. However, in some implementations, the device may have more than one antenna 725, which may be able to transmit or receive multiple wireless transmissions concurrently.

[0111] Memory 730 may include random access memory (RAM) and read-only memory (ROM). Memory 730 may store computer-readable, computer-executable code 735, including instructions that, when executed, cause the processor to perform the various functions described herein. In some implementations, memory 730 may, in particular, include a basic I / O system (BIOS) that controls basic hardware or software operations, such as interaction with peripheral components or devices.

[0112] Processor 740 may include hardware devices such as a general-purpose processor, a digital signal processor (DSP), a central processing unit (CPU), a microcontroller, an application-specific integrated circuit (ASIC), a field-programmable gate array (FPGA), a programmable logic device, discrete gate or transistor logic components, discrete hardware components, or any combination thereof. In some implementations, processor 740 may be configured to use a memory controller to operate a memory array. In some other examples, the memory controller may be integrated into processor 740. Processor 740 may be configured to execute computer-readable instructions stored in memory (e.g., memory 730) to cause device 705 to perform various functions (e.g., supporting functions or tasks for SPS and configured-to-transmit time slot identifiers).

[0113] Processor 740 may be any suitable one or more processors capable of executing scripts or instructions of one or more software programs stored in device 705 (such as in memory 730). For example, processor 740 may execute communication manager 710 or I / O controller 715.

[0114] In some implementations, processor 740 may be a component of a processing system. A processing system generally refers to a system or a series of machines or components that receive inputs and process those inputs to produce a set of outputs (which may be passed to other systems or, for example, components of device 705). For example, the processing system of device 705 may refer to a system that includes various other components or sub-components of device 705.

[0115] The processing system of device 705 can interface with other components of device 705 and can process information (such as inputs or signals) received from other components and output information to other components. For example, the chip or modem of device 705 may include a processing system, a first interface for outputting information transmission, and a second interface for receiving information received on a wireless channel. In some cases, the first interface may refer to the interface between the processing system of the chip or modem and a transmitter, allowing device 705 to transmit information output from the chip or modem. In some cases, the second interface may refer to the interface between the processing system of the chip or modem and a receiver, allowing device 705 to receive information or signal input, and the information can be transmitted to the processing system. Those skilled in the art will readily recognize that the first interface can also receive information or signal input, and the second interface can also output information or signal output.

[0116] Code 735 may include instructions for implementing various aspects of this disclosure, including instructions for supporting wireless communication. Code 735 may be stored in a non-transient computer-readable medium, such as system memory or other types of memory. In some implementations, code 735 may not be directly executable by processor 740, but may enable a computer (e.g., at compile and execution time) to perform the functions described herein.

[0117] In some implementations, the communication manager 710 may be implemented as an integrated circuit or chipset for a mobile device modem, and the receiver and transmitter may be implemented as analog components (e.g., amplifiers, filters, antennas) coupled to the mobile device modem to enable wireless transmission and reception over one or more frequency bands.

[0118] Figure 8 A diagram of a system 800 including an example device 805 supporting frequency-selective PTRS allocation is shown. Device 805 may be an example of BS 105 as described herein or a component including BS 105. Device 805 may include components for bidirectional voice and data communication, including components for transmitting and receiving communications, including a communication manager 810, a network communication manager 815, a transceiver 820, an antenna 825, a memory 830, a processor 840, and an inter-station communication manager 845. These components may be in electronic communication via one or more buses (e.g., bus 850).

[0119] The communication manager 810 can identify a set of frequency resources available for PTRS transmission to the UE. The communication manager 810 transmits control information to the UE indicating that a subset of frequency resources from the frequency resource set includes a first PTRS for a first communication between the BS and the UE, wherein the first communication spans the frequency resource set. The communication manager 810 transmits the first communication and the first PTRS to the UE, wherein the first PTRS is transmitted within the frequency resource subset.

[0120] In some implementations, when used as a processor or processing system, the communication manager 810 can use a first interface or a second interface to obtain signaling from a receiver (such as transceiver 820), and can use the first interface or the second interface to output signaling for transmission via a transmitter (such as transceiver 820).

[0121] The network communication manager 815 can manage communication with the core network (e.g., via one or more wired backhaul links). For example, the network communication manager 815 can manage the delivery of data communication by client devices (such as one or more UEs 115).

[0122] Transceiver 820 can communicate bidirectionally via one or more antennas, wired or wireless links, as described herein. For example, transceiver 820 may represent a wireless transceiver and be able to communicate bidirectionally with another wireless transceiver. Transceiver 820 may also include a modem to modulate packets and provide the modulated packets to the antenna for transmission, and to demodulate packets received from the antenna.

[0123] In some implementations, the wireless device may include a single antenna 825. However, in some implementations, the device may have more than one antenna 825, which may be able to transmit or receive multiple wireless transmissions concurrently.

[0124] Memory 830 may include RAM, ROM, or a combination thereof. Memory 830 may store computer-readable code 835 including instructions that, when executed by a processor (e.g., processor 840), cause the device to perform the various functions described herein. In some implementations, memory 830 may, in particular, include a BIOS that controls basic hardware or software operations, such as interaction with peripheral components or devices.

[0125] Processor 840 may include intelligent hardware devices (e.g., general-purpose processors, DSPs, CPUs, microcontrollers, ASICs, FPGAs, programmable logic devices, discrete gate or transistor logic components, discrete hardware components, or any combination thereof). In some implementations, processor 840 may be configured to use a memory controller to operate a memory array. In some implementations, the memory controller may be integrated into processor 840. Processor 840 may be configured to execute computer-readable instructions stored in memory (e.g., memory 830) to cause device 805 to perform various functions (e.g., supporting functions or tasks for SPS and configured-to-transfer time slot identifiers).

[0126] Inter-site communication manager 845 can manage communication with other BS 105s and may include a controller or scheduler for cooperating with other BS 105s to control communication with UE 115. For example, inter-site communication manager 845 can coordinate the scheduling of transmissions to UE 115 for various interference mitigation techniques, such as beamforming or joint transmission. In some implementations, inter-site communication manager 845 may provide an X2 interface within LTE / LTE-A wireless communication network technology to facilitate communication between BS 105s.

[0127] Code 835 may include instructions for implementing various aspects of this disclosure, including instructions for supporting wireless communication. Code 835 may be stored in a non-transitory computer-readable medium, such as system memory or other types of memory. In some implementations, code 835 may not be directly executable by processor 840, but may enable a computer (e.g., at compile and execution time) to perform the functions described herein.

[0128] Figure 9 A flowchart illustrating a method 900 supporting frequency-selective PTRS allocation is shown. The operation of method 900 can be implemented by a UE 115 or its components as described herein. For example, the operation of method 900 can be implemented by, as described in reference... Figure 7 The described communication manager is used to perform this function. In some examples, the UE can execute a set of instructions to control the functional elements of the UE to perform the following functions. Alternatively or alternatively, the UE can use dedicated hardware to perform aspects of the following functions.

[0129] In 905, the UE can identify the set of frequency resources configured for PTRS transmission. Operation of 905 can be performed according to the methods described herein.

[0130] In 910, the UE may receive control information from the base station (BS) instructing a first PTRS associated with a first communication to be transmitted using a subset of frequency resources from the frequency resource set, wherein the first communication spans the frequency resource set. Operation of 910 may be performed according to the methods described herein.

[0131] In 915, the UE can select phase noise compensation for the first communication. The operation of 915 can be performed according to the method described herein.

[0132] Figure 10 A flowchart illustrating a method 1000 supporting frequency-selective PTRS allocation is shown. The operation of method 1000 can be implemented by a UE 115 or its components as described herein. For example, the operation of method 1000 can be implemented by, as described in reference... Figure 7 The described communication manager is used to perform this function. In some examples, the UE can execute a set of instructions to control the functional elements of the UE to perform the following functions. Alternatively or alternatively, the UE can use dedicated hardware to perform aspects of the following functions.

[0133] In 1005, the UE can receive configuration information from the BS, which indicates the frequency resource set available for PTRS transmission as a number of PTRS frequency tuners per RB within that frequency resource set. Operation of 1005 can be performed according to the methods described herein.

[0134] In 1010, the UE can identify the set of frequency resources configured for PTRS transmission based on this configuration information. Operation of 1010 can be performed according to the methods described herein.

[0135] In 1015, the UE may receive control information from the BS, which instructs a first PTRS associated with a first communication to be transmitted using a subset of frequency resources from the frequency resource set, wherein the first communication spans the frequency resource set. Operation of 1015 may be performed according to the methods described herein.

[0136] In 1020, the UE can select phase noise compensation for the first communication. The operation of 1020 can be performed according to the method described herein.

[0137] Figure 11 A flowchart illustrating method 1100 for supporting frequency-selective PTRS allocation is shown. Operation of method 1100 can be implemented by UE 115 or its components as described herein. For example, operation of method 1100 can be implemented by, as described in reference... Figure 7 The described communication manager is used to perform this function. In some examples, the UE can execute a set of instructions to control the functional elements of the UE to perform the following functions. Alternatively or alternatively, the UE can use dedicated hardware to perform aspects of the following functions.

[0138] In 1105, the UE can identify the set of frequency resources configured for PTRS transmission. Operation of 1105 can be performed according to the methods described herein.

[0139] In 1110, the UE can measure one or more reference signals from the BS, wherein the one or more reference signals span a set of frequency resources. The operation of 1110 can be performed according to the methods described herein.

[0140] In step 1115, the UE can identify a first subset of frequency resources based on the measurement, the first subset of frequency resources having channel conditions that satisfy or exceed the channel conditions of one or more other subsets of frequency resources. The operation of step 1115 can be performed according to the method described herein.

[0141] At 1120, the UE may transmit an indication of the first frequency resource subset to the BS. The operation of 1120 may be performed according to the method described herein.

[0142] At 1125, the UE may receive control information from the BS, the control information instructing a first PTRS associated with a first communication to use a first subset of frequency resources for transmission, wherein the first communication spans the set of frequency resources. Operation of 1125 may be performed according to the methods described herein.

[0143] At 1130, the UE can select phase noise compensation for the first communication. The operation of 1130 can be performed according to the method described herein.

[0144] Figure 12 A flowchart illustrating method 1200 for supporting frequency-selective PTRS allocation is shown. The operation of method 1200 can be implemented by BS 105 or its components as described herein. For example, the operation of method 1200 can be implemented by, as referenced... Figure 8 The described communication manager is used to perform this. In some examples, the base station can execute a set of instructions to control the functional elements of the base station to perform the following functions. Additionally or alternatively, the base station may use dedicated hardware to perform aspects of the following functions.

[0145] At 1205, the base station can identify a set of frequency resources available for PTRS transmission to the UE. Operation of 1205 can be performed according to the methods described herein.

[0146] In 1210, the base station may transmit control information to the UE, the control information indicating that a subset of frequency resources from the frequency resource set includes a first PTRS for a first communication between the BS and the UE, wherein the first communication spans the frequency resource set. Operation of 1210 may be performed according to the methods described herein.

[0147] At 1215, the base station may transmit the first communication and the first PTRS to the UE, wherein the first PTRS is transmitted in the subset of frequency resources. The operation of 1215 may be performed according to the method described herein.

[0148] Figure 13 A flowchart illustrating method 1300 for supporting frequency-selective PTRS allocation is shown. Operation of method 1300 can be implemented by BS 105 or its components as described herein. For example, operation of method 1300 can be implemented by, as referenced... Figure 8 The described communication manager is used to perform this. In some examples, the base station can execute a set of instructions to control the functional elements of the base station to perform the following functions. Additionally or alternatively, the base station may use dedicated hardware to perform aspects of the following functions.

[0149] At 1305, the base station can identify a set of frequency resources available for PTRS transmission to the UE. Operation of 1305 can be performed according to the methods described herein.

[0150] In 1310, the base station can transmit configuration information to the UE, which indicates the frequency resource set available for PTRS transmission as a number of PTRS frequency modulators per RB within the frequency resource set. The operation of 1310 can be performed according to the methods described herein.

[0151] At 1315, the base station may transmit control information to the UE, the control information indicating that a subset of frequency resources from the frequency resource set includes a first PTRS for a first communication between the BS and the UE, wherein the first communication spans the frequency resource set. Operation of 1315 may be performed according to the methods described herein.

[0152] At 1320, the base station can transmit the first communication and the first PTRS to the UE, wherein the first PTRS is transmitted in the subset of frequency resources. The operation of 1320 can be performed according to the method described herein.

[0153] The following provides an overview of some aspects of this disclosure:

[0154] Aspect 1: A method for wireless communication at a device of a UE, comprising: identifying a set of frequency resources configured for PTRS transmission; receiving control information from a BS, the control information indicating that a first PTRS associated with a first communication is transmitted using a subset of frequency resources from the set of frequency resources, wherein the first communication spans the set of frequency resources; and selecting phase noise compensation for the first communication.

[0155] Aspect 2: The method of aspect 1 further includes: receiving configuration information from the BS, the configuration information indicating the frequency resource set available for PTRS transmission as a number of PTRS frequency modulations per RB within the frequency resource set.

[0156] Aspect 3: The method of aspect 2, wherein the configuration information provides: a plurality of frequency subbands as the frequency resource set, a plurality of PTRS modes in at least one of the plurality of frequency subbands, or any combination thereof, and wherein the control information indicates a first frequency subband as a subset of the frequency resource set and a first PTRS mode for the first PTRS.

[0157] Aspect 4: The method of any of Aspects 1-3, wherein receiving the control information includes: receiving a PTRS index value from the BS in the control information; and selecting, at least in part, a mode of the frequency resource subset and the REs containing the first PTRS within the frequency resource subset based on the PTRS index value.

[0158] Aspect 5: The method of any of Aspects 1-3 further includes: identifying a resource partition indication in the control information, the resource partition indication indicating a first resource partition within a set of RBs allocated for communication between the UE and the BS; identifying an offset indication in the control information, the offset indication indicating a first offset within the first resource partition; and selecting the frequency resource subset based at least in part on the first resource partition and the first offset.

[0159] Aspect 6: The method of aspect 5 further includes: identifying a PTRS mode indication in the control information, the PTRS mode indication indicating a RE mode for the first PTRS within the subset of frequency resources.

[0160] Aspect 7: The method of any of Aspects 1-6 further includes: measuring one or more reference signals from the BS, wherein the one or more reference signals span a set of frequency resources; identifying a first subset of frequency resources based at least in part on the measurement, the first subset of frequency resources having channel conditions that satisfy or exceed channel conditions of one or more other subsets of frequency resources; and transmitting an indication of the first subset of frequency resources to the BS, wherein the control information indicates that the first subset of frequency resources includes the first PTRS.

[0161] Aspect 8: The method of aspect 7, wherein the first PTRS includes a first number of frequency modulations within the first frequency resource subset based on a frequency density parameter associated with the frequency resource set.

[0162] Aspect 9: The method of aspect 8, wherein the first number of frequency tunes within the first subset of frequency resources are power boosted to provide a converged power level that matches the total power associated with the total number of PTRS frequency tunes spanning the frequency resource set.

[0163] Aspect 10: The method of any of Aspects 7-9, wherein the transmission further comprises: transmitting, at least in part, the total number of frequency modulations requested by the PTRS for the first communication based on the measurement.

[0164] Aspect 11: The method of any of Aspects 7-10 further includes: selecting the TB size of the first communication based at least in part on the indicated TB size or the overhead parameter used for calculating the TB size and the number of PTRS frequency modulations in the first frequency resource subset.

[0165] Aspect 12: The method of aspect 11, wherein the TB size of the first communication is adjusted based on PTRS frequency modulation only in the first frequency resource subset relative to the indicated TB size or the calculated TB size to take into account reduced PTRS overhead.

[0166] Aspect 13: The method of any of Aspects 7-12, wherein the control information indicates the TB size of the first communication, the TB size of the first communication being adjusted for reduced PTRS overhead based on PTRS frequency modulation being transmitted only in the first frequency resource subset.

[0167] Aspect 14: The method of any of Aspects 1-13 further includes: receiving control signaling from the BS to activate or deactivate a PTRS frequency resource indication, wherein the control signaling is received in one or more of RRC signaling or MAC control elements.

[0168] Aspect 15: The method of aspect 14, wherein the control signaling includes a threshold for activating the RB indicated by the PTRS frequency resource provided by the control information.

[0169] Aspect 16: A method for wireless communication at a device of a BS, comprising: identifying a set of frequency resources available for PTRS transmission to a UE; transmitting control information to the UE, the control information indicating that a subset of frequency resources from the set of frequency resources includes a first PTRS for a first communication between the BS and the UE, wherein the first communication spans the set of frequency resources; and transmitting the first communication and the first PTRS to the UE, wherein the first PTRS is transmitted in the subset of frequency resources.

[0170] Aspect 17: The method of aspect 16 further includes: transmitting configuration information to the UE, the configuration information indicating the frequency resource set available for PTRS transmission as a number of PTRS frequency modulations per RB within the frequency resource set.

[0171] Aspect 18: The method of aspect 17, wherein the configuration information provides: a plurality of frequency subbands as the frequency resource set, a plurality of PTRS modes in at least one of the plurality of frequency subbands, or any combination thereof, and wherein the control information is used for the first frequency band of the first PTRS as a subset of the frequency resource set and the first PTRS mode.

[0172] Aspect 19: The method of any of Aspects 16-18, wherein transmitting the control information includes: selecting a PTRS index value of the first PTRS based at least in part on the frequency resource subset and a pattern in which the REs of the first PTRS are contained within the frequency resource subset; and transmitting the PTRS index value to the UE in the control information.

[0173] Aspect 20: The method of any of Aspects 16-18 further includes: transmitting in the control information the location of the frequency resource subset as a resource partition indication and an offset indication, the resource partition indication indicating a first resource partition within a set of RBs allocated for communication between the UE and the BS, and the offset indication indicating a first offset within the first resource partition.

[0174] Aspect 21: The method of aspect 20 further includes: transmitting in the control information a PTRS mode indication for a resource element (RE) mode for the first PTRS within the frequency resource subset.

[0175] Aspect 22: The method of any of Aspects 16-21 further includes: selecting a first subset of frequency resources from the frequency resource set based at least in part on one or more of a measurement report from the UE, one or more measurements of a UE reference signal, one or more resource allocations to one or more other UEs, or any combination thereof, the first subset of frequency resources having channel conditions that satisfy or exceed the channel conditions of one or more other subsets of frequency resources, and wherein the control information indicates that the first subset of frequency resources includes the first PTRS.

[0176] Aspect 23: The method of aspect 22, wherein the first PTRS includes a first number of frequency modulations within the first frequency resource subset based on a frequency density parameter associated with the frequency resource set.

[0177] Aspect 24: The method of aspect 23, wherein the first number of frequency tunes within the first subset of frequency resources are power boosted to provide a clustered power level that matches the total power associated with the total number of PTRS frequency tunes spanning the frequency resource set.

[0178] Aspect 25: The method of any of Aspects 22-24 further includes: receiving from the UE an indication of the total number of frequency modulations requested by the PTRS for the first communication.

[0179] Aspect 26: The method of any of Aspects 22-25 further includes: selecting the TB size of the first communication based at least in part on the TB size indicated in the control information and the number of PTRS frequency modulations in the first frequency resource subset.

[0180] Aspect 27: The method of aspect 26, wherein the TB size of the first communication is adjusted relative to the indicated TB size based on PTRS frequency modulation only in the first frequency resource subset to take into account reduced PTRS overhead.

[0181] Aspect 28: The method of any of Aspects 22-27, wherein the control information indicates the TB size of the first communication, the TB size of the first communication being adjusted for reduced PTRS overhead based on PTRS frequency modulation being transmitted only in the first frequency resource subset.

[0182] Aspect 29: The method of any of Aspects 16-28 further includes: transmitting control signaling to the UE to activate or deactivate a PTRS frequency resource indication, wherein the control signaling is transmitted in one or more of an RRC signaling or a Media Access Control (MAC) control element.

[0183] Aspect 30: The method of aspect 29, wherein the control signaling includes a threshold for activating a resource block (RB) indicated by the PTRS frequency resource provided by the control information.

[0184] Aspect 31: The method of any of Aspects 16-30, wherein the first PTRS is transmitted in a plurality of frequency moduli of the subset of frequency resources, and wherein different frequency moduli among the plurality of frequency moduli have different transmit powers based on estimated channel conditions associated with each frequency moduli.

[0185] Aspect 32: The method of aspect 31, wherein the transmit power of the plurality of frequency modulations for the subset of frequency resources is determined to provide utilization of the total available transmit power for the first PTRS.

[0186] Aspect 33: The method of any of Aspects 31-32, wherein the BS selects one or more PTRS modes including zero power frequency modulation based on the estimated channel conditions, the PTRS modes being selected from a predefined set of modes, and wherein the index of the PTRS mode is signaled to the UE via the control information.

[0187] Aspect 34: An apparatus for wireless communication at a UE, comprising: at least one first interface, and a processing system configured to cause the apparatus to perform a method as described in any of Aspects 1 to 15.

[0188] Aspect 35: An apparatus for wireless communication at a UE, comprising: a processor; a memory coupled to the processor; and instructions stored in the memory and executable by the processor to cause the apparatus to perform a method as described in any of Aspects 1 to 15.

[0189] Aspect 36: An apparatus for wireless communication at a UE, comprising at least one means for performing the method of any one of aspects 1 to 15.

[0190] Aspect 37: A non-transient computer-readable medium storing code for wireless communication at a UE, the code including instructions executable by a processor to perform methods as described in any of Aspects 1 to 15.

[0191] Aspect 38: An apparatus for wireless communication at a BS, comprising: at least one first interface, and a processing system configured to cause the apparatus to perform a method as described in any of Aspects 16 to 33.

[0192] Aspect 39: An apparatus for wireless communication at a BS, comprising: a processor; a memory coupled to the processor; and instructions stored in the memory and executable by the processor to cause the apparatus to perform a method as described in any of Aspects 16 to 33.

[0193] Aspect 40: An apparatus for wireless communication at a BS, comprising at least one means for performing the method of any one of aspects 16 to 33.

[0194] Aspect 41: A non-transient computer-readable medium storing code for wireless communication at a BS, the code including instructions executable by a processor to perform methods as described in any of Aspects 16 to 33.

[0195] As used in this article, the phrase “at least one of” referring to a list of items means any combination of those items, including a single member. As an example, “at least one of a, b, or c” is intended to cover: a, b, c, ab, ac, bc, and abc.

[0196] The various descriptive logics, logic blocks, modules, circuits, and algorithmic processes described in conjunction with the implementations disclosed herein can be implemented as electronic hardware, computer software, or a combination of both. This interchangeability between hardware and software has been generally described in terms of its functionality, and is explained in the various descriptive components, blocks, modules, circuits, and processes described above. Whether such functionality is implemented in hardware or software depends on the specific application and the design constraints imposed on the overall system.

[0197] Hardware and data processing means for implementing the various descriptive logics, logic blocks, modules, and circuits described in conjunction with the aspects disclosed herein may be implemented or executed using a general-purpose single-chip or multi-chip processor, DSP, ASIC, 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, or any conventional processor, controller, microcontroller, or state machine. A processor may also be implemented as a combination of computing devices, such as a combination of a DSP and a microprocessor, multiple microprocessors, one or more microprocessors cooperating with a DSP core, or any other such configuration. In some implementations, specific processes and methods may be performed by a circuit system dedicated to a given function.

[0198] In one or more aspects, the described functionality may be implemented in hardware, digital electronic circuit systems, computer software, firmware (including the structures disclosed herein and their structural equivalents), or any combination thereof. Implementation of the subject matter described herein may also be implemented as one or more computer programs, such as one or more modules of computer program instructions encoded on a computer storage medium for execution by a data processing apparatus or for controlling the operation of a data processing apparatus.

[0199] Various modifications to the implementations described in this disclosure may be apparent to those skilled in the art, and the general principles defined herein may be applied to other implementations without departing from the spirit or scope of this disclosure. Therefore, the claims are not intended to be limited to the implementations shown herein, but are to be granted the broadest scope consistent with this disclosure, the principles disclosed herein, and the novel features.

[0200] Some features described in this specification in the context of separate implementations may also be implemented in combination in a single implementation. Conversely, various features described in the context of a single implementation may also be implemented separately or in any suitable sub-combination in multiple implementations. Furthermore, although features may be described above as operating in certain combinations and even originally claimed in this way, one or more features from the claimed combination may be removed from that combination in some implementations, and the claimed combination may be for sub-combinations or variations thereof.

[0201] Similarly, although the operations are depicted in a specific order in the accompanying drawings, this should not be construed as requiring such operations to be performed in the specific order shown or sequentially, or requiring the performance of all explained operations to achieve the desired result. Furthermore, the drawings may schematically depict one or more example processes in the form of flowcharts. However, other operations not depicted may be incorporated into the schematically explained example processes. For example, one or more additional operations may be performed before, after, simultaneously with, or between any explained operation. In some environments, multitasking and parallel processing may be advantageous. Moreover, the separation of the various system components in the implementations described above should not be construed as requiring such separation in all implementations, and it should be understood that the described program components and systems can generally be integrated together in a single software product or packaged into multiple software products. Additionally, other implementations also fall within the scope of the appended claims. In some implementations, the actions recited in the claims may be performed in a different order and still achieve the desired result.

Claims

1. An apparatus for performing wireless communication at a user equipment (UE), comprising: The first interface is configured as follows: The configuration information is obtained, which will be configured to indicate the frequency resource set used for phase tracking reference signal (PTRS) transmission as a number of PTRS frequency modulations per resource block (RB) within the frequency resource set; as well as Obtain control information indicating that a first PTRS associated with a first communication uses a subset of frequency resources from the frequency resource set configured for the PTRS transmission, wherein the first communication spans the frequency resource set configured for the PTRS transmission; and Processing system, the processing system being configured to: Select phase noise compensation for the first communication.

2. The apparatus of claim 1, wherein: The configuration information provides: Multiple frequency sub-bands constitute the frequency resource set. Multiple PTRS modes within at least one of the plurality of frequency sub-bands, or Any combination thereof, and The control information indicates a first frequency sub-band and a first PTRS mode, which are subsets of the frequency resources used for the first PTRS.

3. The apparatus of claim 1, wherein: The first interface or the second interface is configured as follows: Obtain the PTRS index value from the control information; and The processing system is further configured to: The selection of the frequency resource subset and the mode of the frequency resource subset containing the resource element RE of the first PTRS is based at least in part on the PTRS index value.

4. The apparatus of claim 1, wherein: The processing system is further configured to: The resource partitioning indication in the control information identifies a first resource partition within a set of resource blocks (RBs) allocated for communication between the UE and the network device. The offset indication in the control information indicates a first offset within the first resource partition; as well as The frequency resource subset is selected at least in part based on the first resource partition and the first offset.

5. The apparatus of claim 4, wherein: The processing system is further configured to: The PTRS mode indication in the control information indicates the RE mode of the resource element used for the first PTRS within the frequency resource subset.

6. The apparatus of claim 1, wherein: The processing system is further configured to: Measure one or more reference signals, wherein the one or more reference signals span a set of frequency resources; The first subset of frequency resources is identified at least in part based on the measurements, the first subset of frequency resources having channel conditions that satisfy or exceed the channel conditions of one or more other subsets of frequency resources; and The first interface or the second interface is configured as follows: Output an indication of the first frequency resource subset, wherein the control information indicates that the first frequency resource subset includes the first PTRS.

7. The apparatus of claim 6, wherein: The first PTRS is based on a frequency density parameter associated with the frequency resource set, including a first number of frequency modulations within the first frequency resource subset.

8. The apparatus of claim 7, wherein: The first number of frequency tunes within the first subset of frequency resources are boosted to provide a converged power level that matches the total power associated with the total number of PTRS frequency tunes spanning the first subset of frequency resources.

9. The apparatus of claim 6, wherein: The first interface or the second interface is configured to: Output the total number of frequency modulations requested by the PTRS used for the first communication.

10. The apparatus of claim 6, wherein: The processing system is further configured to: The TB size of the first communication is selected at least in part based on the indicated transport block (TB) size or the overhead parameter used for TB size calculation and the number of PTRS frequency modulations in the first frequency resource subset.

11. The apparatus of claim 1, wherein: The first interface or the second interface is configured as follows: Obtain control signaling to activate or deactivate a PTRS frequency resource indication, wherein the control signaling is provided in one or more of Radio Resource Control (RRC) signaling or Media Access Control (MAC) control elements, and wherein the control signaling includes a threshold for activating a resource block (RB) of the PTRS frequency resource indication provided by the control information.

12. An apparatus for wireless communication at a network device, comprising: Processing system; as well as The first interface is configured as follows: Output configuration information for user equipment (UE), wherein the configuration information is configured to indicate the frequency resource set for phase tracking reference signal (PTRS) transmission as a number of PTRS frequency modulations per resource block (RB) within the frequency resource set; as well as Output control information to the UE, the control information indicating that a subset of frequency resources from the frequency resource set configured for the PTRS transmission includes a first PTRS for a first communication between the network device and the UE, wherein the first communication spans the frequency resource set configured for the PTRS transmission; as well as The first communication and the first PTRS are output to the UE, wherein the first PTRS is transmitted in the frequency resource subset.

13. The apparatus of claim 12, wherein: The configuration information provides: Multiple frequency sub-bands constitute the frequency resource set. Multiple PTRS modes within at least one of the multiple frequency sub-bands or any combination thereof, and The control information indicates a first frequency sub-band and a first PTRS mode, which are subsets of the frequency resources used for the first PTRS.

14. The apparatus of claim 12, wherein: The processing system is further configured to: The PTRS index value of the first PTRS is selected at least in part based on the frequency resource subset and the pattern of resource elements REs containing the first PTRS within the frequency resource subset; and The first interface or the second interface is configured as follows: The PTRS index value is output to the UE in the control information.

15. The apparatus of claim 12, wherein: The first interface or the second interface is configured as follows: The control information outputs the location of the frequency resource subset as a resource partition indication and an offset indication. The resource partition indication indicates a first resource partition within a set of resource blocks (RBs) allocated for communication between the UE and the network device, and the offset indication indicates a first offset within the first resource partition.

16. The apparatus of claim 15, wherein: The first interface or the second interface is configured to: The control information outputs a PTRS mode indication for the RE mode of the resource element used for the first PTRS within the frequency resource subset.

17. The apparatus of claim 12, wherein: The processing system is further configured to: The channel conditions from a first subset of the frequency resource set that satisfy or exceed the channel conditions of one or more other frequency resource subsets are determined at least in part based on measurement reports from the UE, one or more measurements of the UE reference signal, one or more resource allocations to one or more other UEs, or any combination thereof; and The control information indicates that the first frequency resource subset includes the first PTRS.

18. The apparatus of claim 17, wherein: The first PTRS is based on a frequency density parameter associated with the frequency resource set, including a first number of frequency modulations within the first frequency resource subset.

19. The apparatus of claim 18, wherein: The first number of frequency tunes within the first subset of frequency resources are boosted to provide a converged power level that matches the total power associated with the total number of PTRS frequency tunes spanning the first subset of frequency resources.

20. The apparatus of claim 17, wherein: The first interface or the second interface is configured as follows: Obtain an indication of the total number of frequency modulations requested by the first PTRS used for the first communication.

21. The apparatus of claim 17, wherein: The processing system is further configured to: The TB size of the first communication is selected at least in part based on the transport block (TB) size indicated in the control information and the number of PTRS frequency modulations in the first frequency resource subset.

22. The apparatus of claim 12, wherein: The first interface or the second interface is configured as follows: The control signaling is output to the UE to activate or deactivate the PTRS frequency resource indication, wherein the control signaling is provided in one or more of the Radio Resource Control (RRC) signaling or the Media Access Control (MAC) control element, and wherein the control signaling includes a threshold for activating the resource block (RB) of the PTRS frequency resource indication provided by the control information.

23. The apparatus of claim 12, wherein: The first PTRS is transmitted in multiple frequency moduli of the subset of frequency resources, and the different frequency moduli in the plurality of frequency moduli have different transmit powers based on the estimated channel conditions associated with each frequency moduli.

24. A method for performing wireless communication at a device of a user equipment (UE), comprising: Receive configuration information, the configuration information being configured to indicate the frequency resource set for phase tracking reference signal (PTRS) transmission as a number of PTRS frequency modulations per resource block (RB) within the frequency resource set; Receive control information, the control information instructing a first PTRS associated with a first communication to be transmitted using a subset of frequency resources from the frequency resource set configured for the PTRS transmission, wherein the first communication spans the frequency resource set configured for the PTRS transmission; as well as Select phase noise compensation for the first communication.

25. The method of claim 24, further comprising: Measure one or more reference signals, wherein the one or more reference signals span a set of frequency resources; The first frequency resource subset is identified at least in part based on the measurement, the first frequency resource subset having channel conditions that satisfy or exceed the channel conditions of one or more other frequency resource subsets; as well as The control information indicates that the first frequency resource subset includes the first PTRS.

26. The method of claim 24, wherein: The configuration information provides: Multiple frequency sub-bands constitute the frequency resource set. Multiple PTRS modes within at least one of the plurality of frequency sub-bands, or Any combination thereof, and The control information indicates a first frequency sub-band and a first PTRS mode, which are subsets of the frequency resources used for the first PTRS.

27. The method of claim 24, further comprising: Obtain the PTRS index value from the control information; as well as The selection of the frequency resource subset and the mode of the frequency resource subset containing the resource element RE of the first PTRS is based at least in part on the PTRS index value.

28. A method for performing wireless communication at a means of a network device, comprising: The configuration information for the user equipment (UE) is transmitted, wherein the configuration information is configured such that the frequency resource set for phase tracking reference signal (PTRS) transmission is indicated as a number of PTRS frequency modulations per resource block (RB) within the frequency resource set; Control information is transmitted to the UE, the control information indicating that a subset of frequency resources from the frequency resource set configured for the PTRS transmission includes a first PTRS for a first communication between the network device and the UE, wherein the first communication spans the frequency resource set configured for the PTRS transmission; as well as The first communication and the first PTRS are transmitted to the UE, wherein the first PTRS is transmitted in the frequency resource subset.

29. The method of claim 28, wherein: The configuration information provides: Multiple frequency sub-bands constitute the frequency resource set. Multiple PTRS modes within at least one of the plurality of frequency sub-bands, or Any combination thereof, and The control information indicates a first frequency sub-band and a first PTRS mode, which are subsets of the frequency resources used for the first PTRS.

30. The method of claim 28, further comprising: The PTRS index value of the first PTRS is selected at least in part based on the frequency resource subset and the pattern of the resource element RE containing the first PTRS within the frequency resource subset; as well as The PTRS index value is output to the UE in the control information.

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