Resource allocation for peak reduction tones

Wireless communication techniques that include techniques for allocating resources for peak reduction tones are discussed. A UE may receive from a base station an indication of one or more frequency resources that are allocated for uplink communication. The UE may also receive from the base station an indication of a subset of the one or more frequency resources allocated for uplink communication that are also allocated for transmission of one or more peak reduction tones. The UE may transmit to the base station at least one peak reduction tone on at least one frequency resource of the subset of the one or more frequency resources. Other aspects and features are also claimed and described.

TECHNICAL FIELD

Aspects of the present disclosure relate generally to wireless communication systems, and more particularly, to techniques for allocating resources for peak reduction tones in wireless communication systems. Certain implementations of the technology discussed below can enable and provide enhanced communication features and techniques for communication systems, including higher data rates, higher capacity, higher performance, better spectral efficiency, higher mobility, lower memory usage, and lower power device operations.

INTRODUCTION

Wireless communication networks are widely deployed to provide various communication services such as voice, video, packet data, messaging, broadcast, and the like. These wireless networks may be multiple-access networks capable of supporting multiple users by sharing the available network resources. Such networks may be access networks that support communications for multiple users by sharing the available network resources.

A wireless communication network may include several components. These components may include wireless communication devices, such as base stations (or node Bs) that can support communication for a number of user equipments (UEs). A UE may communicate with a base station via downlink and uplink. The downlink (or forward link) refers to the communication link from the base station to the UE, and the uplink (or reverse link) refers to the communication link from the UE to the base station.

A base station may transmit data and control information on a downlink to a UE or may receive data and control information on an uplink from the UE. On the downlink, a transmission from the base station may encounter interference due to transmissions from neighbor base stations or from other wireless radio frequency (RF) transmitters. On the uplink, a transmission from the UE may encounter interference from uplink transmissions of other UEs communicating with the neighbor base stations or from other wireless RF transmitters. This interference may degrade performance on both the downlink and uplink.

SUMMARY

In one aspect of the disclosure, a method of wireless communication at a UE is provided. For example, a method can include receiving an indication of one or more frequency resources that are allocated for uplink communication. The method may also include receiving an indication of a subset of the one or more frequency resources allocated for uplink communication that are also allocated for transmission of one or more peak reduction tones. The method may further include transmitting at least one peak reduction tone on at least one frequency resource of the subset of the one or more frequency resources.

In another aspect of the disclosure, an apparatus configured for wireless communication is provided. For example, the apparatus can include means for receiving an indication of one or more frequency resources that are allocated for uplink communication. The apparatus can also include means for receiving an indication of a subset of the one or more frequency resources allocated for uplink communication that are also allocated for transmission of one or more peak reduction tones. The apparatus may further include means for transmitting at least one peak reduction tone on at least one frequency resource of the subset of the one or more frequency resources.

In an additional aspect of the disclosure, a non-transitory computer-readable medium having program code recorded thereon is provided. The program code can include program code executable by a computer for causing the computer to receive an indication of one or more frequency resources that are allocated for uplink communication. The program code can also include program code executable by the computer for causing the computer to receive an indication of a subset of the one or more frequency resources allocated for uplink communication that are also allocated for transmission of one or more peak reduction tones. The program code may also include program code executable by the computer for causing the computer to transmit at least one peak reduction tone on at least one frequency resource of the subset of the one or more frequency resources.

In another aspect of the disclosure, an apparatus configured for wireless communication is provided. The apparatus includes at least one processor, and a memory coupled to the processor. The at least one processor can be configured to receive an indication of one or more frequency resources that are allocated for uplink communication. The at least one processor can also be configured to receive an indication of a subset of the one or more frequency resources allocated for uplink communication that are also allocated for transmission of one or more peak reduction tones. The at least one processor may be further configured to transmit at least one peak reduction tone on at least one frequency resource of the subset of the one or more frequency resources.

In one aspect of the disclosure, a method of wireless communication at a base station is provided. For example, a method can include transmitting an indication of one or more frequency resources that are allocated for uplink communication. The method may also include transmitting an indication of a subset of the one or more frequency resources allocated for uplink communication that are also allocated for transmission of one or more peak reduction tones. The method may further include receiving at least one peak reduction tone on at least one frequency resource of the subset of the one or more frequency resources.

In another aspect of the disclosure, an apparatus configured for wireless communication is provided. For example, the apparatus can include means for transmitting an indication of one or more frequency resources that are allocated for uplink communication. The apparatus can also include means for transmitting an indication of a subset of the one or more frequency resources allocated for uplink communication that are also allocated for transmission of one or more peak reduction tones. The apparatus may further include means for receiving at least one peak reduction tone on at least one frequency resource of the subset of the one or more frequency resources.

In an additional aspect of the disclosure, a non-transitory computer-readable medium having program code recorded thereon is provided. The program code can include program code executable by a computer for causing the computer to transmit an indication of one or more frequency resources that are allocated for uplink communication. The program code may also include program code executable by the computer for causing the computer to transmit an indication of a subset of the one or more frequency resources allocated for uplink communication that are also allocated for transmission of one or more peak reduction tones. The program code may further include program code executable by the computer for causing the computer to receive at least one peak reduction tone on at least one frequency resource of the subset of the one or more frequency resources.

In another aspect of the disclosure, an apparatus configured for wireless communication is provided. The apparatus includes at least one processor, and a memory coupled to the processor. The at least one processor can be configured to transmit an indication of one or more frequency resources that are allocated for uplink communication. The at least one processor can also be configured to transmit an indication of a subset of the one or more frequency resources allocated for uplink communication that are also allocated for transmission of one or more peak reduction tones. The at least one processor may also be configured to receive at least one peak reduction tone on at least one frequency resource of the subset of the one or more frequency resources.

While aspects and implementations are described in this application by illustration to some examples, those skilled in the art will understand that additional implementations and use cases may come about in many different arrangements and scenarios. Innovations described herein may be implemented across many differing platform types, devices, systems, shapes, sizes, packaging arrangements. For example, aspects or uses may come about via integrated chip implementations and other non-module-component based devices (e.g., end-user devices, vehicles, communication devices, computing devices, industrial equipment, retail devices, purchasing devices, medical devices, artificial intelligence (AI)-enabled devices, etc.). While some examples may or may not be specifically directed to use cases or applications, a wide assortment of applicability of described innovations may occur. Implementations may range in spectrum from chip-level or modular components to non-modular, non-chip-level implementations and further to aggregate, distributed, or original equipment manufacturer (OEM) devices or systems incorporating one or more aspects of the described innovations. In some practical settings, devices incorporating described aspects and features may also necessarily include additional components and features for implementation and practice of claimed and described aspects. For example, transmission and reception of wireless signals necessarily includes a number of components for analog and digital purposes (e.g., hardware components including antenna, radio frequency (RF)-chains, power amplifiers, modulators, buffer, processor(s), interleaver, adders, summers, etc.). It is intended that innovations described herein may be practiced in a wide variety of devices, chip-level components, systems, distributed arrangements, end-user devices, etc. of varying sizes, shapes, and constitution.

DETAILED DESCRIPTION

While aspects and implementations are described in this application by illustration to some examples, those skilled in the art will understand that additional implementations and use cases may come about in many different arrangements and scenarios. Innovations described herein may be implemented across many differing platform types, devices, systems, shapes, sizes, packaging arrangements. For example, implementations and/or uses may come about via integrated chip implementations and/or other non-module-component based devices (e.g., end-user devices, vehicles, communication devices, computing devices, industrial equipment, retail/purchasing devices, medical devices, AI-enabled devices, etc.). While some examples may or may not be specifically directed to use cases or applications, a wide assortment of applicability of described innovations may occur. Implementations may range from chip-level or modular components to non-modular, non-chip-level implementations and further to aggregated, distributed, or OEM devices or systems incorporating one or more described aspects. In some practical settings, devices incorporating described aspects and features may also necessarily include additional components and features for implementation and practice of claimed and described implementations. It is intended that innovations described herein may be practiced in a wide variety of implementations, including both large/small devices, chip-level components, multi-component systems (e.g. RF-chain, communication interface, processor), distributed arrangements, end-user devices, etc. of varying sizes, shapes, and constitution.

FIG.1is a block diagram illustrating details of an example wireless communication system. The wireless communication system may include wireless network100. Wireless network100may, for example, include a 5G wireless network. As appreciated by those skilled in the art, components appearing inFIG.1are likely to have related counterparts in other network arrangements including, for example, cellular-style network arrangements and non-cellular-style-network arrangements (e.g., device to device or peer to peer or ad hoc network arrangements, etc.).

FIG.2shows a block diagram conceptually illustrating an example design of a base station105and a UE115, which may be any of the base stations and one of the UEs inFIG.1. For a restricted association scenario (as mentioned above), base station105may be small cell base station105finFIG.1, and UE115may be UE115cor115D operating in a service area of base station105f, which in order to access small cell base station105f, would be included in a list of accessible UEs for small cell base station105f. Base station105may also be a base station of some other type. As shown inFIG.2, base station105may be equipped with antennas234athrough234t, and UE115may be equipped with antennas252athrough252rfor facilitating wireless communications.

At base station105, transmit processor220may receive data from data source212and control information from controller/processor240. The control information may be for the physical broadcast channel (PBCH), physical control format indicator channel (PCFICH), physical hybrid-ARQ (automatic repeat request) indicator channel (PHICH), physical downlink control channel (PDCCH), enhanced physical downlink control channel (EPDCCH), MTC physical downlink control channel (MPDCCH), etc. The data may be for the PDSCH, etc. Additionally, transmit processor220may process (e.g., encode and symbol map) the data and control information to obtain data symbols and control symbols, respectively. Transmit processor220may also generate reference symbols, e.g., for the primary synchronization signal (PSS) and secondary synchronization signal (SSS), and cell-specific reference signal. Transmit (TX) multiple-input multiple-output (MIMO) processor230may perform spatial processing (e.g., precoding) on the data symbols, the control symbols, and/or the reference symbols, if applicable, and may provide output symbol streams to modulators (MODs)232athrough232t. For example, spatial processing performed on the data symbols, the control symbols, or the reference symbols may include precoding. Each modulator232may process a respective output symbol stream (e.g., for OFDM, etc.) to obtain an output sample stream. Each modulator232may additionally or alternatively process (e.g., convert to analog, amplify, filter, and upconvert) the output sample stream to obtain a downlink signal. Downlink signals from modulators232athrough232tmay be transmitted via antennas234athrough234t, respectively.

Controllers/processors240and280may direct the operation at base station105and UE115, respectively. Controller/processor240and/or other processors and modules at base station105and/or controller/processor280and/or other processors and modules at UE115may perform or direct the execution of various processes for the techniques described herein, such as to perform or direct the execution illustrated inFIGS.3and4, and/or other processes for the techniques described herein. Memories242and282may store data and program codes for base station105and UE115, respectively. Scheduler244may schedule UEs for data transmission on the downlink and/or uplink.

Wireless communications systems operated by different network operating entities (e.g., network operators) may share spectrum. In some instances, a network operating entity may be configured to use an entirety of a designated shared spectrum for at least a period of time before another network operating entity uses the entirety of the designated shared spectrum for a different period of time. Thus, in order to allow network operating entities use of the full designated shared spectrum, and in order to mitigate interfering communications between the different network operating entities, certain resources (e.g., time) may be partitioned and allocated to the different network operating entities for certain types of communication.

For example, a network operating entity may be allocated certain time resources reserved for exclusive communication by the network operating entity using the entirety of the shared spectrum. The network operating entity may also be allocated other time resources where the entity is given priority over other network operating entities to communicate using the shared spectrum. These time resources, prioritized for use by the network operating entity, may be utilized by other network operating entities on an opportunistic basis if the prioritized network operating entity does not utilize the resources. Additional time resources may be allocated for any network operator to use on an opportunistic basis.

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

In some aspects of the disclosure, wireless communication that utilizes orthogonal frequency-division multiplexing (OFDM) may exhibit a high peak-to-average power ratio (PAPR). A high PAPR is typically undesirable because it often requires large reductions of transmission power, which in turn may result in reduced transmission power efficiency and/or reduced overall transmission data rate.

PAPR may be reduced in many ways, such as through the use of peak reduction tones (PRTs). As disclosed herein, a tone may refer to a signal transmitted at a certain frequency resource, e.g., a subcarrier, and a PRT may refer to a tone transmitted to reduce a time-domain peak of another signal, such as a data signal. That is, a PRT may adjust the shape of the time-domain representation of the data signal such that a time-domain peak of the data signal is reduced. Many PRTs may be transmitted to reduce many peaks in a signal, e.g., to adjust the shape of the time-domain representation of the data signal. For example, data may be transmitted using certain frequency resources in the frequency domain, and that transmitted data may be associated with a certain time-domain representation, e.g., a time-domain data signal. Along with the data, PRTs may be transmitted using frequency resources in the frequency domain. In the time domain, when the time-domain representation of the transmitted PRTs is combined with the time-domain representation of the transmitted data signal, the PRTs may reduce some of the peaks of the time-domain data signal. As a result, the PAPR associated with transmission of the data signal may be reduced.

Typically, PRTs are transmitted on only frequency resources that are orthogonal to the frequency resources used for the transmission of data. In other words, typically there is no known relation between data tones and PRTs. However, such a limitation to the frequency resources available for PRTs may result in less-than-optimal PAPR reduction.

Aspects of the disclosure may provide enhanced techniques for allocating resources for PRTs. For example, in some aspects, the resources may not be limited to only frequency resources that are orthogonal to the frequency resources used for the transmission of data.FIG.3, as an example, shows a block diagram illustrating a method for resource allocation for PRTs according to some aspects of the present disclosure. Aspects of method300may be implemented with various other aspects of this disclosure described with respect toFIGS.1-2and5, such as a mobile device/UE. For example, with reference toFIG.2, controller/processor280of UE115may control UE115to perform method300.

The example blocks of method300will also be described with respect to UE115as illustrated inFIG.5.FIG.5is a block diagram conceptually illustrating a design of a UE configured according to some aspects of the present disclosure. UE115may include various structures, hardware, and components, such as those illustrated for UE115ofFIG.2. For example, UE115includes controller/processor280, which operates to execute logic or computer instructions stored in memory282. The controller/processor280can also control components of UE115that provide the features and functionality of UE115. UE115, under control of controller/processor280, transmits and receives signals via wireless radios501a-rand antennas252a-r. Wireless radios501a-rinclude various components and hardware, as illustrated inFIG.2for UE115, including modulator/demodulators254a-r, MIMO detector256, receive processor258, transmit processor264, and TX MIMO processor266. The controller/processor280can be provided with digital signals obtained from sampling received analog wireless signals for purposes of controlling communication operations.

FIG.3illustrates a method300that may be performed by a wireless communication device, such as a UE115. Method300includes, at block302, a UE receiving an indication of one or more frequency resources that are allocated for uplink communication. Similarly, as described below with respect toFIG.4, a base station, such as a gNB105, may transmit an indication of one or more frequency resources that are allocated for uplink communication.

In some aspects, uplink communication may refer to the transmission of control information and/or data information from a UE to a base station. For example, uplink communication, e.g., as shown at block302ofFIG.3, may refer to information transmitted over a PUCCH and/or a PUSCH. As a specific example, uplink communication may include transmission of an uplink demodulation reference signal (DMRS).

According to some aspects, a frequency resource for wireless communication may refer to a single frequency resource element (RE) or a group of frequency resource elements. In some aspects, a single frequency resource may be referred to as a subcarrier and may correspond to a smallest unit of a frequency of a wireless communication system that can be allocated, e.g., mapped or made available, for transmission and/or reception of information, such as control information, data information, and/or PRTs. In additional aspects of the disclosure, a group of frequency resources may be referred to as resource block (RB) such that an RB can be allocated, e.g., mapped or made available, for transmission and/or reception of information, such as control information, data information, and/or PRTs. In some aspects of the disclosure, the one or more frequency resources that are allocated, e.g., mapped or made available, for uplink communication, e.g., as shown at block302ofFIG.3, may refer to one or more subcarriers and/or a one or more RBs.

In some aspects, a UE may also transmit PRTs to reduce PAPR associated with the uplink communication, e.g., information, such as an uplink DMRS, transmitted over a PUCCH and/or a PUSCH. In other words, the PRTs may be transmitted along with the uplink communication. The frequency resources for the PRTs may also be specified by a base station, such as a gNB105. The specified frequency resources to use for the PRTs may include only resources used for uplink communication, only resources not used for uplink communication, or a combination of resources used for uplink communication and resources not used for uplink communication.

According to some aspects, a UE may be informed by a base station of frequency resources already allocated for uplink communication that may also be allocated for transmission of one or more PRTs. For example, method300includes, at block304, a UE receiving an indication of a subset of the one or more frequency resources allocated for uplink communication that are also allocated for transmission of one or more PRTs. Similarly, as described below with respect toFIG.4, a base station, such as a gNB105, may transmit an indication of a subset of the one or more frequency resources allocated for uplink communication that are also allocated for transmission of one or more PRTs. In some aspects, the subset of frequency resources that are allocated for both uplink communication and for transmission of one or more PRTs may be used by a UE to transmit both uplink information and PRTs to a base station.

In some aspects, a UE may also be informed by a base station of frequency resources not already allocated for uplink communication that may also be allocated for transmission of one or more PRTs. For example, a UE may receive an indication of another one or more frequency resources that are allocated for transmission of one or more PRTs. Similarly, a base station may transmit an indication of an other one or more frequency resources that are allocated for transmission of one or more PRTs. In some aspects, the other one or more frequency resources may not include the one or more frequency resources. In other words, the other one or more frequency resources may not include a subset of the one or more frequency resources allocated for uplink communication. According to some aspects, the one or more frequency resources that may not include a subset of the one or more frequency resources allocated for uplink communication may still be used by a UE to transmit PRTs to a base station.

According to some aspects of the disclosure, a UE may transmit PRTs in accordance with one or more indications of frequency resources allocated for transmission of one or more PRTs. For example, method300includes, at block306, a UE transmitting at least one PRT on at least one frequency resource of the subset of the one or more frequency resources. In some aspects, a UE may also transmit at least one other PRT on at least one frequency resource of the one or more frequency resources that may not include a subset of the one or more frequency resources allocated for uplink communication. Similarly, as described below with respect toFIG.4, a base station, such as a gNB105, may receive at least one PRT on at least one frequency resource of the subset of the one or more frequency resources. In additional aspects, a base station, such as a gNB105, may receive at least one other PRT on at least one frequency resource of the one or more frequency resources that may not include a subset of the one or more frequency resources allocated for uplink communication.

In some aspects, a frequency resource used for wireless communication may be used to transmit both an information signal, e.g., control or data information, and a PRT. For example, when a UE transmits a PRT on a frequency resource of the subset of one or more frequency resources allocated for uplink communication, e.g., as shown at block306ofFIG.3, the UE may transmit both an information signal and a PRT using that same frequency resource during the same time span. In some aspects, the PRT may be added to an information signal that is to be transmitted using the one or more frequency resources allocated for uplink communication. According to some aspects, the PRT may be added to the information signal such that the PRT is present in only the subset of frequency resources allocated for both uplink communication, i.e., transmission of uplink information, and PRTs.

According to some aspects, the indication of the subset of the one or more frequency resources allocated for both uplink communication and transmission of one or more PRTs may include various types of indications. For example, in some aspects, the indication may include an indication of a frequency offset between a frequency resource of the subset of the one or more frequency resources and a frequency resource of the one or more frequency resources allocated for uplink communication. According to some aspects, the frequency offset may be specified as a number of RBs and/or a number of subcarriers. In some aspects, the frequency resource of the subset of the one or more frequency resources used as a reference for the frequency offset indication may be a frequency resource having the lowest frequency of the subset of frequency resources or a frequency resource having the highest frequency of the subset of frequency resources. In other aspects, the frequency resource of the subset of the one or more frequency resources used as a reference for the frequency offset indication may be a frequency resource having a centermost frequency of the subset of frequency resources. According to some aspects, the frequency resource of the one or more frequency resources allocated for uplink communication used as a reference for the frequency offset indication may be a frequency resource having the lowest frequency of the frequency resources allocated for uplink communication or a frequency resource having the highest frequency of the frequency resources allocated for uplink communication. In other aspects, the frequency resource of the one or more frequency resources allocated for uplink communication used as a reference for the frequency offset indication may be a frequency resource having a centermost frequency of the frequency resources allocated for uplink communication. For example, the frequency resource used as a reference may be a first or last frequency resource of a PUSCH.

In some aspects of the disclosure, the frequency offset indication may be in accordance with one or more time resources that are allocated for at least one of uplink communication or transmission of one or more PRTs. In other words, the frequency offset indication may be transmitted by a base station, and/or received by a UE, in accordance with one or more time resources that are allocated for at least one of uplink communication or transmission of one or more PRTs. In some aspects, a time resource may refer to a single time resource element or a group of time resource elements. In some aspects, a single time resource may be referred to as a symbol and may correspond to a smallest unit of a time period of a wireless communication system that can be allocated, e.g., mapped or made available, for transmission and/or reception of information, such as control information, data information, and/or PRTs. In additional aspects of the disclosure, a group of time resources, e.g., a group of symbols, may be referred to as a half-slot, slot, subframe, frame, etc. such that a group of symbols, such as a half-slot or a slot, can be allocated, e.g., mapped or made available, for transmission and/or reception of information, such as control information, data information, and/or PRTs.

According to some aspects, the frequency offset indication may be in accordance with or based, e.g., determined, transmitted, and/or received, on the one or more time resources that are allocated for at least one of uplink communication or transmission of one or more PRTs. For example, in some aspects, the frequency offset indication may be different for different time resources that are allocated for at least one of uplink communication or transmission of one or more PRTs. As a specific example, a first frequency offset indication for frequency resources associated with a first time resource allocated for at least one of uplink communication or transmission of one or more PRTs, such as a first symbol or a first slot, may be different than a second frequency offset indication for frequency resources associated with a second time resource allocated for at least one of uplink communication or transmission of one or more PRTs, such as a second symbol or a second slot. Accordingly, in some aspects, the indication of the subset of the one or more frequency resources allocated for both uplink communication and transmission of one or more PRTs may include an indication of one or more frequency offsets that are associated with one or more time resources that are allocated for at least one of uplink communication or transmission of one or more PRTs.

In some aspects, the indication of the subset of the one or more frequency resources allocated for both uplink communication and transmission of one or more PRTs may include a number of contiguous frequency resources included in the subset of the one or more frequency resources. According to some aspects, the contiguous frequency resources may be contiguous subcarriers. In some aspects, the contiguous frequency resources may be contiguous RBs. According to some aspects, when the contiguous frequency resources are contiguous RBs, the subcarriers within the contiguous RBs that are available for transmission of PRTs may be contiguous subcarriers of the contiguous RBs or may be non-contiguous subcarriers of the contiguous RBs. In some aspects, the indication of a number of contiguous frequency resources may be in accordance with or based, e.g., determined, transmitted, and/or received, on the one or more time resources that are allocated for at least one of uplink communication or transmission of one or more PRTs. For example, in some aspects, the indication of a number of contiguous frequency resources may be different for different time resources that are allocated for at least one of uplink communication or transmission of one or more PRTs. As a specific example, a first indication of a number of contiguous frequency resources associated with a first time resource allocated for at least one of uplink communication or transmission of one or more PRTs, such as a first symbol or a first slot, may be different than a second indication of a number of contiguous frequency resources associated with a second time resource allocated for at least one of uplink communication or transmission of one or more PRTs, such as a second symbol or a second slot.

According to some aspects, the indication of the subset of the one or more frequency resources allocated for both uplink communication and transmission of one or more PRTs may include a bitmap indicating frequency resources allocated for transmission of one or more PRTs. For example, the bitmap may identify which frequency resources are available for transmission of PRTs and which frequency resources are not available for transmission of PRTs. In some aspects, the bitmap indication may be in accordance with or based, e.g., determined, transmitted, and/or received, on the one or more time resources that are allocated for at least one of uplink communication or transmission of one or more PRTs. For example, in some aspects, the bitmap indication may be different for different time resources that are allocated for at least one of uplink communication or transmission of one or more PRTs. As a specific example, a first bitmap indication for frequency resources associated with a first time resource allocated for at least one of uplink communication or transmission of one or more PRTs, such as a first symbol or a first slot, may be different than a second bitmap indication for frequency resources associated with a second time resource allocated for at least one of uplink communication or transmission of one or more PRTs, such as a second symbol or a second slot.

In some aspects, the indication of the other one or more frequency resources may also be in accordance with or based, e.g., determined, transmitted, and/or received, on the one or more time resources that are allocated for at least one of uplink communication or transmission of one or more PRTs. For example, in some aspects, the indication of the other one or more frequency resources may be different for different time resources that are allocated for at least one of uplink communication or transmission of one or more PRTs. As a specific example, a first indication of the other one or more frequency resources associated with a first time resource, such as a first symbol or a first slot, may be different than a second indication of the other one or more frequency resources associated with a second time resource, such as a second symbol or a second slot.

In some aspects, frequency resources may be allocated for transmission of one or more PRTs dynamically or statically. According to some aspects, when allocated dynamically, the indications of frequency resources allocated for transmission of one or more PRTs may be transmitted by the base station to the UE every time the base station transmits an uplink grant to the UE. For example, a base station may transmit the indications in downlink control information (DCI) transmitted to a UE every time the base station transmits an uplink grant to the UE. As a specific example, within one DCI, a base station may transmit, and a UE may receive, an indication of frequency resources, e.g., the indication of the subset and/or the indication of the other one or more frequency resources, that is in accordance with time resources, as described above, such that a first set of one or more frequency resources may be allocated for transmission of PRTs in a first time resource, such as a first symbol, half-slot, slot, etc., and a second set of one or more frequency resources may be allocated for transmission of PRTs in a second time resources, such as a second symbol, half-slot, slot, etc.

According to some aspects, when allocated statically, the indications of frequency resources allocated for transmission of one or more PRTs may not be transmitted by the base station to the UE every time the base station transmits an uplink grant to the UE. For example, a base station may transmit the indications using radio resource control (RRC) signals.

In some aspects of the disclosure, the indication of the subset of the one or more frequency resources and/or the indication of the other one or more frequency resources may be in accordance with or based, e.g., determined, transmitted, and/or received, at least in part, on at least one of a signal-to-interference-plus-noise ratio (SINR) or modulation and coding scheme (MCS) associated with one or more frequency resources of the subset of the one or more frequency resources. Similarly, the indication of the subset of the one or more frequency resources and/or the indication of the other one or more frequency resources may be in accordance with at least one of a SINR or MCS associated with the one or more frequency resources that are allocated for uplink communication. According to some aspects, a base station may measure SINR associated with one or more frequency resources, e.g., frequency resources that are allocated for uplink communication or more specifically the frequency resources of the subset of the one or more frequency resources. In some aspects, the base station may compare each of the measured SINRs to a threshold SINR. According to some aspects, the base station may select frequency resources to allocate for transmission of one or more PRTs in accordance with the SINR associated with a frequency resource being greater than or equal to the threshold SINR. For example, the subset of the one or more frequency resources allocated for transmission of one or more PRTs may correspond to frequency resources, of the one or more frequency resources that are allocated for uplink communication, whose associated SINRs are greater than or equal to the threshold SINR. In some aspects, when additional frequency resources are needed for transmission of PRTs, the additional frequency resources may be selected from the other one or more frequency resources, i.e., one or more frequency resources that may not include a subset of the one or more frequency resources allocated for uplink communication.

The selection of frequency resources to allocate for transmission of one or more PRTs may also be in accordance with the MCS associated with one or more frequency resources, e.g., frequency resources that are allocated for uplink communication or more specifically the frequency resources of the subset of the one or more frequency resources. According to some aspects, a base station may determine the MCS associated with one or more frequency resources, e.g., frequency resources that are allocated for uplink communication or more specifically the frequency resources of the subset of the one or more frequency resources. In some aspects, the subset of the one or more frequency resources allocated for transmission of one or more PRTs may correspond to frequency resources, of the one or more frequency resources that are allocated for uplink communication, associated with a particular one or more target MCSs. In some aspects, when additional frequency resources are needed for transmission of PRTs, the additional frequency resources may be selected from the other one or more frequency resources, i.e., one or more frequency resources that may not include a subset of the one or more frequency resources allocated for uplink communication.

In some aspects, a UE may also receive an indication of a maximum allowed ratio of a power spectral density (PSD) associated with the at least one PRT to a PSD associated with the uplink communication. In some aspects, the PSD associated with the at least PRT may refer to a PSD associated with the transmission of the at least one PRT on at least one frequency resource of the subset of the one or more frequency resources, e.g., as shown at block306ofFIG.3. In additional aspects, the PSD associated with the at least PRT may refer to a PSD associated with the transmission of the at least one PRT on at least one frequency resource of the subset of the one or more frequency resources and at least one frequency resource of the other one or more frequency resources, i.e., one or more frequency resources that may not include a subset of the one or more frequency resources allocated for uplink communication. In some aspects, the PSD associated with the uplink communication may refer to a PSD associated with the transmission of uplink information, such as control information and/or data information.

According to some aspects, a UE may transmit the at least one PRT in accordance with the received maximum allowed ratio. For example, the UE may transmit the at least one PRT such that the ratio of the PSD associated with the at least one PRT to the PSD associated with the uplink communication does not exceed the indicated maximum allowed ratio.

FIG.4, as an example, shows another block diagram illustrating another method for resource allocation for PRTs according to some aspects of the present disclosure. Aspects of method400may be implemented with various other aspects of this disclosure described with respect toFIGS.1-2and6, such as a base station/gNB. For example, with reference toFIG.2, controller/processor240of base station105may control base station105to perform method400.

The example blocks of method400will also be described with respect to base station105as illustrated inFIG.6.FIG.6is a block diagram conceptually illustrating a design of a base station (e.g., a gNB) configured according to some aspects of the present disclosure. Base station105may include various structures, hardware, and components, such as those illustrated for base station105ofFIG.2. For example, base station105includes controller/processor240, which operates to execute logic or computer instructions stored in memory242. The controller/processor240can also control components of base station105that provide the features and functionality of base station105. Base station105, under control of controller/processor240, transmits and receives signals via wireless radios601a-tand antennas234a-t. Wireless radios601a-tinclude various components and hardware, as illustrated inFIG.2for base station105, including modulator/demodulators232a-t, MIMO detector236, receive processor238, transmit processor220, and TX MIMO processor230. The controller/processor240can be provided with digital signals obtained from sampling received analog wireless signals for purposes of controlling communication operations.

FIG.4illustrates a method400that may be performed by a wireless communication device, such as a gNB105. Method400includes, at block402, a base station transmitting an indication of one or more frequency resources that are allocated for uplink communication. Method400also includes, at block404, a base station transmitting an indication of a subset of the one or more frequency resources allocated for uplink communication that are also allocated for transmission of one or more peak reduction tones. At block406, method400may include a base station receiving at least one peak reduction tone on at least one frequency resource of the subset of the one or more frequency resources.

In some aspects, techniques for allocating resources for PRTs may include a UE receiving, and a base station transmitting, an indication of one or more frequency resources that are allocated for uplink communication. Techniques for allocating resources for PRTs may also include a UE receiving, and a base station transmitting, an indication of a subset of the one or more frequency resources allocated for uplink communication that are also allocated for transmission of one or more PRTs. Techniques for allocating resources for PRTs may also include a UE transmitting, and a base station receiving, at least one PRT on at least one frequency resource of the subset of the one or more frequency resources.

In a first aspect, a UE may receive, and a base station may transmit, an indication of an other one or more frequency resources that are allocated for transmission of one or more PRTs. In some aspects, the other one or more frequency resources may not include the one or more frequency resources that are allocated for uplink communication.

In a second aspect, alone or in combination with the first aspect, a UE may transmit, and a base station may receive, at least one other PRT on at least one frequency resource of the other one or more frequency resources.

In a third aspect, alone or in combination with one or more of the first and second aspects, the indication of the subset of the one or more frequency resource may be in accordance with at least one of a SINR or MCS associated with one or more frequency resources of the subset of the one or more frequency resources.

In a fourth aspect, alone or in combination with one or more of the first through third aspects, the indication of the subset of the one or more frequency resources may include a frequency offset between a frequency resource of the subset of the one or more frequency resources and a frequency resource of the one or more frequency resources.

In a fifth aspect, alone or in combination with one or more of the first through fourth aspects, the indication of the subset of the one or more frequency resources may include a number of contiguous frequency resources included in the subset of the one or more frequency resources.

In a sixth aspect, alone or in combination with one or more of the first through fifth aspects, the indication of the subset of the one or more frequency resources may include a bitmap indicating frequency resources allocated for transmission of one or more PRTs.

In a seventh aspect, alone or in combination with one or more of the first through sixth aspects, at least one of the frequency offset, the number of contiguous frequency resources, or the bitmap may be in accordance with one or more time resources that are allocated for at least one of uplink communication or transmission of one or more PRTs.

In an eighth aspect, alone or in combination with one or more of the first through seventh aspects, a UE may receive, and a base station may transmit, an indication of a maximum allowed ratio of a power spectral density associated with the at least one PRT to a power spectral density associated with the uplink communication.

In a ninth aspect, alone or in combination with one or more of the first through eighth aspects, a UE may transmit, and a base station may receive, the at least one PRT in accordance with the received maximum allowed ratio.

Components, the functional blocks, and modules described herein (e.g., the components, functional blocks, and modules inFIG.2) may comprise processors, electronics devices, hardware devices, electronics components, logical circuits, memories, software codes, firmware codes, etc., or any combination thereof. In addition, features discussed herein may be implemented via specialized processor circuitry, via executable instructions, and/or combinations thereof.