SEMI-PERSISTENT WAVEFORM SWITCHING FOR UPLINK

Method and apparatus for semi-persistent waveform switching for uplink transmissions. The apparatus outputs a semi-static waveform configuration indicating a semi-statically indicated waveform. The apparatus outputs, after the output of the semi-static waveform configuration, an indication for a user equipment (UE) to switch to a first waveform configuration for uplink transmission during a time window of validity. The apparatus obtains the uplink transmission based on the first waveform configuration during the time window of validity. The apparatus switches, based on an expiration of the time window of validity, from obtaining the uplink transmission based on the first waveform configuration to obtaining the uplink transmission based on the semi-statically indicated waveform.

TECHNICAL FIELD

The present disclosure relates generally to communication systems, and more particularly, to a configuration for semi-persistent waveform switching for uplink transmissions.

INTRODUCTION

BRIEF SUMMARY

In an aspect of the disclosure, a method, a computer-readable medium, and an apparatus are provided. The apparatus may be a device at a UE. The device may be a processor and/or a modem at a UE or the UE itself. The apparatus receives an indication to switch to a first waveform configuration for uplink transmission over a period of time. The apparatus transmits the uplink transmission based on the first waveform configuration during the period of time.

In an aspect of the disclosure, a method, a computer-readable medium, and an apparatus are provided. The apparatus may be a device at a network node. The device may be a processor and/or a modem at a network node or the network node itself. The apparatus outputs an indication for a user equipment (UE) to switch to a first waveform configuration for uplink transmission over a period of time. The apparatus obtains the uplink transmission within the period of time and based on the first waveform configuration.

DETAILED DESCRIPTION

In wireless communications, switching between discrete Fourier transform (DFT) spread OFDM (DFT-s-OFDM) or cyclic prefix (CP) orthogonal frequency division multiplexing (OFDM) (CP-OFDM) may be determined by enabling or disabling transform precoding. In some instances, it may be more desirable to use DFT-s-OFDM due to DFT-s-OFDM having a lower peak to average power ratio (PAPR) than CP-OFDM, even though CP-OFDM may be more straight forward to implement in terms of symbol mapping. Waveform indication may be indicated by a scheduling DCI, such that the scheduling DCI that schedules an uplink transmission may also indicate the waveform that should be used for that uplink transmission. However, such scheduling DCI may include a new uplink DCI bit field for uplink scheduling to indicate the waveform.

Aspects presented herein provide a configuration to allow for the dynamically indicate a waveform for uplink transmission to be applied in a semi-persistent manner. The aspects presented herein may allow a UE to enable or disable a transform precoding based on a dynamic indication from a network entity. For example, the UE may switch to a specific waveform configuration for uplink transmission for a period of time in response to an indication from the network entity.

FIG. 1 is a diagram 100 illustrating an example of a wireless communications system and an access network. The illustrated wireless communications system includes a disaggregated base station architecture. The disaggregated base station architecture may include one or more CUs 110 that can communicate directly with a core network 120 via a backhaul link, or indirectly with the core network 120 through one or more disaggregated base station units (such as a Near-Real Time (Near-RT) RAN Intelligent Controller (RIC) 125 via an E2 link, or a Non-Real Time (Non-RT) RIC 115 associated with a Service Management and Orchestration (SMO) Framework 105, or both). A CU 110 may communicate with one or more DUs 130 via respective midhaul links, such as an F1 interface. The DUs 130 may communicate with one or more RUs 140 via respective fronthaul links. The RUs 140 may communicate with respective UEs 104 via one or more radio frequency (RF) access links. In some implementations, the UE 104 may be simultaneously served by multiple RUs 140.

Each of the units, i.e., the CUS 110, the DUs 130, the RUs 140, as well as the Near-RT RICs 125, the Non-RT RICs 115, and the SMO Framework 105, may include one or more interfaces or be coupled to one or more interfaces configured to receive or to transmit signals, data, or information (collectively, signals) via a wired or wireless transmission medium. Each of the units, or an associated processor or controller providing instructions to the communication interfaces of the units, can be configured to communicate with one or more of the other units via the transmission medium. For example, the units can include a wired interface configured to receive or to transmit signals over a wired transmission medium to one or more of the other units. Additionally, the units can include a wireless interface, which may include a receiver, a transmitter, or a transceiver (such as an RF transceiver), configured to receive or to transmit signals, or both, over a wireless transmission medium to one or more of the other units.

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

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

The SMO Framework 105 may be configured to support RAN deployment and provisioning of non-virtualized and virtualized network elements. For non-virtualized network elements, the SMO Framework 105 may be configured to support the deployment of dedicated physical resources for RAN coverage requirements that may be managed via an operations and maintenance interface (such as an O1 interface). For virtualized network elements, the SMO Framework 105 may be configured to interact with a cloud computing platform (such as an open cloud (O-Cloud) 190) to perform network element life cycle management (such as to instantiate virtualized network elements) via a cloud computing platform interface (such as an O2 interface). Such virtualized network elements can include, but are not limited to, CUs 110, DUs 130, RUs 140 and Near-RT RICs 125. In some implementations, the SMO Framework 105 can communicate with a hardware aspect of a 4G RAN, such as an open eNB (O-eNB) 111, via an O1 interface. Additionally, in some implementations, the SMO Framework 105 can communicate directly with one or more RUs 140 via an O1 interface. The SMO Framework 105 also may include a Non-RT RIC 115 configured to support functionality of the SMO Framework 105.

The Non-RT RIC 115 may be configured to include a logical function that enables non-real-time control and optimization of RAN elements and resources, artificial intelligence (AI)/machine learning (ML) (AI/ML) workflows including model training and updates, or policy-based guidance of applications/features in the Near-RT RIC 125. The Non-RT RIC 115 may be coupled to or communicate with (such as via an A1 interface) the Near-RT RIC 125. The Near-RT RIC 125 may be configured to include a logical function that enables near-real-time control and optimization of RAN elements and resources via data collection and actions over an interface (such as via an E2 interface) connecting one or more CUs 110, one or more DUs 130, or both, as well as an O-eNB, with the Near-RT RIC 125.

In some implementations, to generate AI/ML models to be deployed in the Near-RT RIC 125, the Non-RT RIC 115 may receive parameters or external enrichment information from external servers. Such information may be utilized by the Near-RT RIC 125 and may be received at the SMO Framework 105 or the Non-RT RIC 115 from non-network data sources or from network functions. In some examples, the Non-RT RIC 115 or the Near-RT RIC 125 may be configured to tune RAN behavior or performance. For example, the Non-RT RIC 115 may monitor long-term trends and patterns for performance and employ AI/ML models to perform corrective actions through the SMO Framework 105 (such as reconfiguration via 01) or via creation of RAN management policies (such as A1 policies).

At least one of the CU 110, the DU 130, and the RU 140 may be referred to as a base station 102. Accordingly, a base station 102 may include one or more of the CU 110, the DU 130, and the RU 140 (each component indicated with dotted lines to signify that each component may or may not be included in the base station 102). The base station 102 provides an access point to the core network 120 for a UE 104. The base stations 102 may include macrocells (high power cellular base station) and/or small cells (low power cellular base station). The small cells include femtocells, picocells, and microcells. A network that includes both small cell and macrocells may be known as a heterogeneous network. A heterogeneous network may also include Home Evolved Node Bs (eNBs) (HeNBs), which may provide service to a restricted group known as a closed subscriber group (CSG). The communication links between the RUs 140 and the UEs 104 may include uplink (UL) (also referred to as reverse link) transmissions from a UE 104 to an RU 140 and/or downlink (DL) (also referred to as forward link) transmissions from an RU 140 to a UE 104. The communication links may use multiple-input and multiple-output (MIMO) antenna technology, including spatial multiplexing, beamforming, and/or transmit diversity. The communication links may be through one or more carriers. The base stations 102/UEs 104 may use spectrum up to Y MHz (e.g., 5, 10, 15, 20, 100, 400, etc. MHz) bandwidth per carrier allocated in a carrier aggregation of up to a total of Yx MHz (x component carriers) used for transmission in each direction. The carriers may or may not be adjacent to each other. Allocation of carriers may be asymmetric with respect to DL and UL (e.g., more or fewer carriers may be allocated for DL than for UL). The component carriers may include a primary component carrier and one or more secondary component carriers. A primary component carrier may be referred to as a primary cell (PCell) and a secondary component carrier may be referred to as a secondary cell (SCell).

The wireless communications system may further include a Wi-Fi AP 150 in communication with UEs 104 (also referred to as Wi-Fi stations (STAs)) via communication link 154, e.g., in a 5 GHz unlicensed frequency spectrum or the like. When communicating in an unlicensed frequency spectrum, the UEs 104/AP 150 may perform a clear channel assessment (CCA) prior to communicating in order to determine whether the channel is available.

The base station 102 and the UE 104 may each include a plurality of antennas, such as antenna elements, antenna panels, and/or antenna arrays to facilitate beamforming. The base station 102 may transmit a beamformed signal 182 to the UE 104 in one or more transmit directions. The UE 104 may receive the beamformed signal from the base station 102 in one or more receive directions. The UE 104 may also transmit a beamformed signal 184 to the base station 102 in one or more transmit directions. The base station 102 may receive the beamformed signal from the UE 104 in one or more receive directions. The base station 102/UE 104 may perform beam training to determine the best receive and transmit directions for each of the base station 102/UE 104. The transmit and receive directions for the base station 102 may or may not be the same. The transmit and receive directions for the UE 104 may or may not be the same.

The core network 120 may include an Access and Mobility Management Function (AMF) 161, a Session Management Function (SMF) 162, a User Plane Function (UPF) 163, a Unified Data Management (UDM) 164, one or more location servers 168, and other functional entities. The AMF 161 is the control node that processes the signaling between the UEs 104 and the core network 120. The AMF 161 supports registration management, connection management, mobility management, and other functions. The SMF 162 supports session management and other functions. The UPF 163 supports packet routing, packet forwarding, and other functions. The UDM 164 supports the generation of authentication and key agreement (AKA) credentials, user identification handling, access authorization, and subscription management. The one or more location servers 168 are illustrated as including a Gateway Mobile Location Center (GMLC) 165 and a Location Management Function (LMF) 166. However, generally, the one or more location servers 168 may include one or more location/positioning servers, which may include one or more of the GMLC 165, the LMF 166, a position determination entity (PDE), a serving mobile location center (SMLC), a mobile positioning center (MPC), or the like. The GMLC 165 and the LMF 166 support UE location services. The GMLC 165 provides an interface for clients/applications (e.g., emergency services) for accessing UE positioning information. The LMF 166 receives measurements and assistance information from the NG-RAN and the UE 104 via the AMF 161 to compute the position of the UE 104. The NG-RAN may utilize one or more positioning methods in order to determine the position of the UE 104. Positioning the UE 104 may involve signal measurements, a position estimate, and an optional velocity computation based on the measurements. The signal measurements may be made by the UE 104 and/or the serving base station 102. The signals measured may be based on one or more of a satellite positioning system (SPS) 170 (e.g., one or more of a Global Navigation Satellite System (GNSS), global position system (GPS), non-terrestrial network (NTN), or other satellite position/location system), LTE signals, wireless local area network (WLAN) signals, Bluetooth signals, a terrestrial beacon system (TBS), sensor-based information (e.g., barometric pressure sensor, motion sensor), NR enhanced cell ID (NR E-CID) methods, NR signals (e.g., multi-round trip time (Multi-RTT), DL angle-of-departure (DL-AoD), DL time difference of arrival (DL-TDOA), UL time difference of arrival (UL-TDOA), and UL angle-of-arrival (UL-AoA) positioning), and/or other systems/signals/sensors.

Referring again to FIG. 1, in certain aspects, the UE 104 may include a switch component 198 configured to receive an indication to switch to a first waveform configuration for uplink transmission over a period of time; and transmit the uplink transmission based on the first waveform configuration during the period of time.

Referring again to FIG. 1, in certain aspects, the base station 102 may include a configuration component 199 configured to output an indication for a UE to switch to a first waveform configuration for uplink transmission over a period of time; and obtain the uplink transmission within the period of time and based on the first waveform configuration.

SCS
Cyclic

Extended

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

The UL transmission is processed at the base station 310 in a manner similar to that described in connection with the receiver function at the UE 350. Each receiver 318Rx receives a signal through its respective antenna 320. Each receiver 318Rx recovers information modulated onto an RF carrier and provides the information to a RX processor 370.

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

At least one of the TX processor 368, the RX processor 356, and the controller/processor 359 may be configured to perform aspects in connection with the switch component 198 of FIG. 1.

At least one of the TX processor 316, the RX processor 370, and the controller/processor 375 may be configured to perform aspects in connection with the configuration component 199 of FIG. 1.

In wireless communications, switching between DFT-s-OFDM or CP-OFDM may be determined by enabling or disabling transform precoding (e.g., based on a transform precoding parameter such as “RACH-ConfigCommon.msg3-transformPrecoding” for random access or “PUSCH-Config.transformPrecoding” for PUSCH in RRC-connected mode). CP-OFDM, in comparison to DFT-s-OFDM, may be more straight forward in terms of symbol mapping, but has a higher PAPR than DFT-s-OFDM. As such, in some instances, it may be more desirable to use DFT-s-OFDM due to DFT-s-OFDM having a lower PAPR than CP-OFDM, even though CP-OFDM may be more straight forward to implement in terms of symbol mapping.

A waveform indication may be indicated by a scheduling DCI, such that the scheduling DCI that schedules an uplink transmission may also indicate the waveform to be used for that uplink transmission. Such scheduling DCI may include a new uplink DCI bit field for uplink scheduling in order to indicate the waveform.

Aspects presented herein provide a configuration to allow for the dynamical indication of a waveform for uplink transmission, the waveform to be applied in a semi-persistent manner, such as a for a period of time. The aspects presented herein may allow a UE to enable or disable a transform precoding based on a dynamic indication from a network entity. For example, the UE may switch to a specific waveform configuration for uplink transmissions for a period of time in response to an indication from the network entity. At least one advantage of the disclosure is that the UE may change to use of a particular waveform for uplink transmissions during a period of time or until an indication for a semi-static waveform is overwritten based on the UE receiving an additional indication from the network entity.

In some instances, the network entity may indicate (e.g., dynamically indicate) to the UE to enable or disable transform precoding for a period of time or until overwritten by a subsequent indication. For example, the indication may indicate the UE to switch between DFT-s-OFDM or CP-OFDM for uplink transmissions. As an example, the network entity may indicate to the UE to switch to use DFT-s-OFDM for transmissions during a period of time. As another example, the network entity may indicate to the UE to switch to use CP-OFDM for transmissions during a period of time. In some aspects, the dynamic indication may be comprised within a group common DCI to a group of UEs including the UE. In some aspects, the dynamic indication may be included in a UE-specific DCI directed to a particular UE. In some aspects, the dynamic indication may be included in a downlink MAC-CE. In some aspects, the dynamic indication of waveform switching or dynamic enabling/disabling of transform precoding that is not for semi-static application may override a semi-static configuration of enabling/disabling of transform precoding or a dynamic indication of a waveform that is to be applied in a semi-static manner over a period of time. As an example, if the UE receives an indication in DCI or a MAC-CE to use a first waveform for a period of time (e.g., in a semi-static manner), and the UE receives a second indication in DCI or a MAC-CE to use a second waveform in a dynamic manner, the UE may apply the second waveform.

The dynamic indication for semi-static application of a waveform may expire after a period of time (e.g., which may be referred to as a time window of validity for the indication), such that expiration of period of time/time window for the dynamic indication results in the UE returning or resuming transmissions based on a prior waveform, such as a semi-static configuration of transform precoding. In some instances, the time window of validity may be preconfigured. In some instances, the time window of validity may be configured via RRC signaling. In some instances, the network may indicate the time window of validity together with or as a part of the dynamic indication of waveform switching. In some instances, the time window of validity may be configured or indicated in terms of a number of time slots, OFDM symbols, absolute time, or another time period.

The UE may apply (e.g., transmit using) the dynamic indication of the semi-persistent waveform switching after a predefined or preconfigured time period following receipt of the indication. For example, the indication may be implemented or applied after a corresponding processing time, which accounts for the amount of time or a time period the UE utilizes for processing the dynamic indication. In some instances, the processing time for semi-persistent waveform switching may be configured for the UE or indicated in terms of a number of time slots, OFDM symbols, or absolute time.

In some instances, the dynamic indication of the semi-persistent waveform switching may be valid for a subset of uplink data transmission. For example, the indication may be applied to a configured grant based on the configuration of the configured grant. In some instances, the configuration of the configured grant may determine whether the transform precoding may be switched by a dynamic indication.

In some instances, waveform switching may be applied based on whether the uplink transmission is a single layer or a multi-layer multiple input multiple output (MIMO), which may be predefined or configured by the network entity (e.g., via RRC signaling). In some aspects, the switching of the waveform may be linked to a change of uplink transmission parameters, such as but not limited to demodulation reference signal (DMRS), phase tracking (PTRS), contiguous RB allocation, or the like. In some instances, the waveform switching indication may be valid for a current BWP. In some instances, the network entity may expect to receive an acknowledgement (ACK) from the UE for the waveform switching indication before activation of the waveform switching. In such instances, the timing of the activation of the waveform switching indication may be based on or connected to the time of the transmission of the ACK by the UE to the network entity. The ACK may be comprised within a PUCCH or other uplink transmission from the UE to the network entity.

FIG. 4 is a call flow diagram 400 of signaling between a UE 402 and a network entity (e.g., base station or a component of a base station such as a CU, DU, or RU) 404. The UE 402 may be configured to communicate with the base station 404. For example, in the context of FIG. 1, the base station 404 may correspond to base station 102. Further, a UE 402 may correspond to at least UE 104. In another example, in the context of FIG. 3, the base station 404 may correspond to base station 310 and the UE 402 may correspond to UE 350.

At 406, the base station 404 may output (e.g., transmit or provide) a semi-static waveform configuration 406, e.g., in RRC signaling, prior to outputting (e.g., transmitting or providing) an indication for the UE to switch to a first waveform configuration, at 408. The base station 404 my output (e.g., transmit) the semi-static waveform configuration to the UE 402. The UE 402 may receive the semi-static waveform configuration from the base station 404. The UE may receive the first semi-static waveform configuration prior to receiving an indication to switch to a first waveform configuration, at 408. In some aspects, the first waveform may expire after a duration of time. In some aspects, the UE may receive a semi-static indication 405 to apply a different waveform, e.g., which may be referred to as a semi-static waveform, a semi-statically indicated waveform, or a second waveform. The semi-static indication may be different than a dynamic indication, as shown at 408. As illustrated at 407, the UE may transmit uplink transmissions using the semi-statically indicated waveform, as indicated at 405.

At 408, the base station 404 may output an indication for the UE 402 to switch to a first waveform configuration for uplink transmission over a period of time. The UE 402 may receive the indication to switch to the first waveform configuration from the base station 404. In some aspects, the indication may be comprised within a group common DCI, a UE-specific DCI, or a medium access control (MAC) control element (CE) (MAC-CE). In some aspects, the first waveform configuration may comprise at least one of a filtering configuration or a pulse shape. In some aspects, the indication may comprise an enabling or disabling of a transform precoding. The first waveform configuration may be for cyclic prefix orthogonal frequency division multiplexing (CP-OFDM) or DFT-s-OFDM. The first waveform configuration may be associated with a subset of uplink transmissions. The first waveform configuration may be associated with a single layer MIMO or a multi-layer MIMO. In some aspects, the first waveform configuration may be associated with a current BWP.

At 410, the UE 402 may switch to the first waveform configuration, e.g., switching from the semi-statically indicated waveform to the dynamically indicated first waveform for a period of time. For example, the UE may switch to uplink communication based on the first waveform configuration. The UE may switch to the uplink communication based on the first waveform configuration after a time period 413 following receipt of the indication. The time period may comprise a processing time to switch to the first waveform configuration. In another example, the UE may switch to the first waveform configuration for a current bandwidth part (BWP) in response to reception of the indication.

At 412, the base station 404 may switch to reception of uplink communication based on the first waveform configuration. The base station may switch to reception of uplink communication based on the first waveform configuration after a time period following the indication. In some aspects, the time period may comprise a processing time, e.g., time period 413, to switch to the first waveform configuration.

At 414, the UE 402 may transmit an acknowledgement (ACK) in response to the indication. The UE may transmit the ACK to the base station 404. The base station 404 may receive the ACK from the UE 402. The UE may transmit the ACK in response to the indication comprising the first waveform configuration.

At 416, the UE 402 may activate the first waveform configuration. In some aspects, the time period 413 may be an activation time based on the transmission of the ACK until the activation at 416 rather than from the indication at 408 to the activation at 416. For example, UE may activate the first waveform configuration at a time based on the transmission of the acknowledgement.

At 418, the base station 404 may output a configured grant of uplink resources. The UE may receive the configured grant of uplink resources from the base station. The UE may receive the configured grant of uplink resources based on the first waveform configuration. In some aspects, the UE may transmit an uplink transmission using one or more uplink resources of the configured grant and with the first waveform configuration based on the uplink transmission corresponding to a subset of uplink transmissions or based on an indication in the configured grant configured to enable waveform switching or transform precoding switching.

At 420, the UE 402 may transmit uplink transmission(s) based on the first waveform configuration. The base station 404 may obtain the uplink transmission from the UE 402. The UE transmits the uplink transmission based on the first waveform configuration during the period of time, e.g., 417. In some aspects, transmitting the uplink transmission based on the first waveform configuration may include transmitting the uplink transmission with a change of one or more uplink transmission parameters. The one or more uplink transmission parameters may include at least one of a demodulation reference signal parameter, a phase tracking reference signal configuration, or a contiguous resource block allocation.

At 422, the UE 402 may switch from the first waveform configuration to the semi-static waveform configuration. The UE switching from the first waveform configuration to the semi-static waveform configuration upon expiration of the duration of time, e.g., 417. At 424, the base station 404 may switch from receiving the uplink transmission based on the first waveform configuration to the semi-static waveform configuration. The base station may switch from receiving the uplink transmission based on the first waveform configuration to the semi-static waveform configuration upon expiration of the duration of time. The UE may transmit uplink transmissions to the base station, at 425, based on the semi-statically configured waveform, e.g., rather than the first waveform configuration. In some aspects, the duration of time may be preconfigured, configured via RRC signaling, or indicated within the indication. In some aspects, the duration of time may be comprised of at least one of at least one time slot, at least one OFDM symbol, or an absolute period of time.

FIG. 5 is a flowchart 500 of a method of wireless communication. The method may be performed by a UE (e.g., the UE 104; the apparatus 704). One or more of the illustrated operations may be omitted, transposed, or contemporaneous. The method may allow a UE to enable or disable transform precoding based on a dynamic indication from a network entity.

At 502, the UE receives an indication to switch to a first waveform configuration for uplink transmission over a period of time. For example, 502 may be performed by switch component 198 of apparatus 704. In some aspects, the indication may be received in a group common DCI, a UE-specific DCI, or a MAC-CE. In some aspects, the first waveform configuration may comprise at least one of a filtering configuration or a pulse shape. In some aspects, the indication may comprise an enabling or disabling of a transform precoding. The first waveform configuration may be for CP-OFDM or DFT-s-OFDM. The first waveform configuration may be associated with a subset of uplink transmissions. The first waveform configuration may be associated with a single layer MIMO or a multi-layer MIMO.

At 504, the UE transmits the uplink transmission based on the first waveform configuration. For example, 504 may be performed by switch component 198 of apparatus 704. The UE transmits the uplink transmission based on the first waveform configuration during the period of time. In some aspects, transmitting the uplink transmission based on the first waveform configuration may include transmitting the uplink transmission with a change of one or more uplink transmission parameters. The one or more uplink transmission parameters may include at least one of a demodulation reference signal parameter, a phase tracking reference signal configuration, or a contiguous resource block allocation.

FIG. 6 is a flowchart 600 of a method of wireless communication. The method may be performed by a UE (e.g., the UE 104; the apparatus 704). One or more of the illustrated operations may be omitted, transposed, or contemporaneous. The method may allow a UE to enable or disable transform precoding based on a dynamic indication from a network entity.

At 602, the UE may receive a semi-static waveform configuration. For example, 602 may be performed by switch component 198 of apparatus 704. The UE may receive the semi-static waveform configuration prior to receiving an indication to switch to a first waveform configuration. In some aspects, the first waveform configuration may be configured to expire after a duration of time.

At 604, the UE receives an indication to switch to a first waveform configuration for uplink transmission over a period of time. For example, 604 may be performed by switch component 198 of apparatus 704. In some aspects, the indication may be received in a group common DCI, a UE-specific DCI, or a MAC-CE. In some aspects, the first waveform configuration may comprise at least one of a filtering configuration or a pulse shape. In some aspects, the indication may comprise an enabling or disabling of a transform precoding. The first waveform configuration may be for CP-OFDM or DFT-s-OFDM. The first waveform configuration may be associated with a subset of uplink transmissions. The first waveform configuration may be associated with a single layer MIMO or a multi-layer MIMO.

At 606, the UE may switch to uplink communication based on the first waveform configuration. For example, 606 may be performed by switch component 198 of apparatus 704. The UE may switch to the uplink communication based on the first waveform configuration after a time period following receipt of the indication. The time period may comprise a processing time to switch to the first waveform configuration.

At 608, the UE may switch to the first waveform configuration for a current BWP. For example, 608 may be performed by switch component 198 of apparatus 704. The UE may switch to the first waveform configuration for the current BWP in response to reception of the indication.

At 610, the UE may transmit an ACK in response to the indication. For example, 610 may be performed by switch component 198 of apparatus 704. The UE may transmit the ACK in response to the indication comprising the first waveform configuration. The UE may transmit the ACK to the network entity.

At 612, the UE may activate the first waveform configuration. For example, 612 may be performed by switch component 198 of apparatus 704. The UE may activate the first waveform configuration at a time based on the transmission of the acknowledgement.

At 614, the UE may receive a configured grant of uplink resources. For example, 614 may be performed by switch component 198 of apparatus 704. The UE may receive the configured grant of uplink resources from the network entity. The UE may receive the configured grant of uplink resources based on the first waveform configuration. In some aspects, the UE may transmit an uplink transmission using one or more uplink resources of the configured grant and with the first waveform configuration based on the uplink transmission corresponding to a subset of uplink transmissions or based on an indication in the configured grant configured to enable waveform switching or transform precoding switching.

At 616, the UE transmits the uplink transmission based on the first waveform configuration. For example, 616 may be performed by switch component 198 of apparatus 704. The UE transmits the uplink transmission based on the first waveform configuration during the period of time. In some aspects, transmitting the uplink transmission based on the first waveform configuration may include transmitting the uplink transmission with a change of one or more uplink transmission parameters. The one or more uplink transmission parameters may include at least one of a demodulation reference signal parameter, a phase tracking reference signal configuration, or a contiguous resource block allocation.

At 618, the UE may switch from the first waveform configuration to the semi-static waveform configuration. For example, 618 may be performed by switch component 198 of apparatus 704. The UE switching from the first waveform configuration to the semi-static waveform configuration upon expiration of the duration of time. In some aspects, the duration of time may be preconfigured, configured via RRC signaling, or indicated within the indication. The duration of time may be comprised of at least one of at least one time slot, at least one orthogonal frequency division multiplexing (OFDM) symbol, or an absolute period of time.

FIG. 7 is a diagram 700 illustrating an example of a hardware implementation for an apparatus 704. The apparatus 704 may be a UE, a component of a UE, or may implement UE functionality. In some aspects, the apparatus 704 may include a cellular baseband processor 724 (also referred to as a modem) coupled to one or more transceivers 722 (e.g., cellular RF transceiver). The cellular baseband processor 724 may include on-chip memory 724′. In some aspects, the apparatus 704 may further include one or more subscriber identity modules (SIM) cards 720 and an application processor 706 coupled to a secure digital (SD) card 708 and a screen 710. The application processor 706 may include on-chip memory 706′. In some aspects, the apparatus 704 may further include a Bluetooth module 712, a WLAN module 714, an SPS module 716 (e.g., GNSS module), one or more sensor modules 718 (e.g., barometric pressure sensor/altimeter; motion sensor such as inertial management unit (IMU), gyroscope, and/or accelerometer(s); light detection and ranging (LIDAR), radio assisted detection and ranging (RADAR), sound navigation and ranging (SONAR), magnetometer, audio and/or other technologies used for positioning), additional memory modules 726, a power supply 730, and/or a camera 732. The Bluetooth module 712, the WLAN module 714, and the SPS module 716 may include an on-chip transceiver (TRX) (or in some cases, just a receiver (RX)). The Bluetooth module 712, the WLAN module 714, and the SPS module 716 may include their own dedicated antennas and/or utilize the antennas 780 for communication. The cellular baseband processor 724 communicates through the transceiver(s) 722 via one or more antennas 780 with the UE 104 and/or with an RU associated with a network entity 702. The cellular baseband processor 724 and the application processor 706 may each include a computer-readable medium/memory 724′, 706′, respectively. The additional memory modules 726 may also be considered a computer-readable medium/memory. Each computer-readable medium/memory 724′, 706′, 726 may be non-transitory. The cellular baseband processor 724 and the application processor 706 are each responsible for general processing, including the execution of software stored on the computer-readable medium/memory. The software, when executed by the cellular baseband processor 724/application processor 706, causes the cellular baseband processor 724/application processor 706 to perform the various functions described supra. The computer-readable medium/memory may also be used for storing data that is manipulated by the cellular baseband processor 724/application processor 706 when executing software. The cellular baseband processor 724/application processor 706 may be a component of the UE 350 and may include the memory 360 and/or at least one of the TX processor 368, the RX processor 356, and the controller/processor 359. In one configuration, the apparatus 704 may be a processor chip (modem and/or application) and include just the cellular baseband processor 724 and/or the application processor 706, and in another configuration, the apparatus 704 may be the entire UE (e.g., see 350 of FIG. 3) and include the additional modules of the apparatus 704.

As discussed supra, the component 198 is configured to receive an indication to switch to a first waveform configuration for uplink transmission over a period of time; and transmit the uplink transmission based on the first waveform configuration during the period of time. The component 198 may be within the cellular baseband processor 724, the application processor 706, or both the cellular baseband processor 724 and the application processor 706. The component 198 may be one or more hardware components specifically configured to carry out the stated processes/algorithm, implemented by one or more processors configured to perform the stated processes/algorithm, stored within a computer-readable medium for implementation by one or more processors, or some combination thereof. As shown, the apparatus 704 may include a variety of components configured for various functions. In one configuration, the apparatus 704, and in particular the cellular baseband processor 724 and/or the application processor 706, includes means for receiving an indication to switch to a first waveform configuration for uplink transmission over a period of time. The apparatus includes means for transmitting the uplink transmission based on the first waveform configuration during the period of time. The apparatus further includes means for receiving a semi-static waveform configuration prior to receiving the indication to switch to the first waveform configuration. The first waveform configuration is configured to expire after a duration of time. The apparatus further includes means for switching from the first waveform configuration to the semi-static waveform configuration upon expiration of the duration of time. The apparatus further includes means for switching to uplink communication based on the first waveform configuration after a period of time following receipt of the indication. The time period comprises a processing time to switch to the first waveform configuration. The apparatus further includes means for receiving a configured grant of uplink resources. The apparatus further includes means for transmitting the uplink transmission using one or more uplink resources of the configured grant and with the first waveform configuration based on the uplink transmission corresponding to the subset of uplink transmissions or based on an indication in the configured grant enabling waveform switching or transform precoding switching. The apparatus further includes means for switching to the first waveform configuration for a current BWP in response to reception of the indication. The apparatus further includes means for transmitting an acknowledgement in response to the indication comprising the first waveform configuration. The apparatus further includes means for activating of the first waveform configuration at a time based on transmission of the acknowledgement. The means may be the component 198 of the apparatus 704 configured to perform the functions recited by the means. As described supra, the apparatus 704 may include the TX processor 368, the RX processor 356, and the controller/processor 359. As such, in one configuration, the means may be the TX processor 368, the RX processor 356, and/or the controller/processor 359 configured to perform the functions recited by the means.

FIG. 8 is a flowchart 800 of a method of wireless communication. The method may be performed by a base station (e.g., the base station 102; the network entity 1002. One or more of the illustrated operations may be omitted, transposed, or contemporaneous. The method may allow a network entity to dynamically indicate a UE to enable or disable transform precoding.

At 802, the network entity may output an indication for a user equipment (UE) to switch to a first waveform configuration for uplink transmission over a period of time. For example, 802 may be performed by configuration component 199 of network entity 1002. In some aspects, the indication may be comprised within a group common DCI, a UE-specific DCI, or a MAC-CE. In some aspects, the first waveform configuration may comprise at least one of a filtering configuration or a pulse shape. In some aspects, the indication may comprise an enabling or disabling of a transform precoding. The first waveform configuration may be for CP-OFDM or DFT-s-OFDM. The first waveform configuration may be associated with a subset of uplink transmissions. The first waveform configuration may be associated with a single layer MIMO or a multi-layer MIMO. In some aspects, the first waveform configuration may be associated with a current BWP.

At 804, the network entity may obtain the uplink transmission within the period of time. For example, 804 may be performed by configuration component 199 of network entity 1002. The network entity may obtain the uplink transmission within the period of time and based on the first waveform configuration.

FIG. 9 is a flowchart 900 of a method of wireless communication. The method may be performed by a base station (e.g., the base station 102; the network entity 1002. One or more of the illustrated operations may be omitted, transposed, or contemporaneous. The method may allow a network entity to dynamically indicate a UE to enable or disable transform precoding.

At 902, the network entity may output a semi-static waveform configuration. For example, 902 may be performed by configuration component 199 of network entity 1002. The network entity may output the semi-static waveform configuration prior to outputting an indication to switch to a first waveform configuration. In some aspects, the first waveform configuration may be configured to expire after a duration of time.

At 904, the network entity may output an indication for a user equipment (UE) to switch to a first waveform configuration for uplink transmission over a period of time. For example, 904 may be performed by configuration component 199 of network entity 1002. In some aspects, the indication may be comprised within a group common DCI, a UE-specific DCI, or a MAC-CE. In some aspects, the first waveform configuration may comprise at least one of a filtering configuration or a pulse shape. In some aspects, the indication may comprise an enabling or disabling of a transform precoding. The first waveform configuration may be for CP-OFDM or DFT-s-OFDM. The first waveform configuration may be associated with a subset of uplink transmissions. The first waveform configuration may be associated with a single layer MIMO or a multi-layer MIMO. In some aspects, the first waveform configuration may be associated with a current BWP.

At 906, the network entity may switch to reception of uplink communication based on the first waveform configuration. For example, 906 may be performed by configuration component 199 of network entity 1002. The network entity may switch to reception of uplink communication based on the first waveform configuration after a time period following the indication. In some aspects, the time period may comprise a processing time to switch to the first waveform configuration.

At 908, the network entity may receive an ACK in response to the indication comprising the first waveform configuration. For example, 908 may be performed by configuration component 199 of network entity 1002. The network entity may receive the ACK in response to the transmission of the indication comprising the first waveform configuration. The network entity may receive the ACK from the UE. In some aspects, activation of the first waveform configuration may be based on a time of transmission of the acknowledgment.

At 910, the network entity may obtain the uplink transmission within the period of time. For example, 910 may be performed by configuration component 199 of network entity 1002. The network entity may obtain the uplink transmission within the period of time and based on the first waveform configuration.

At 912, the network entity may switch from receiving the uplink transmission based on the first waveform configuration to the semi-static waveform configuration. For example, 912 may be performed by configuration component 199 of network entity 1002. The network entity may switch from receiving the uplink transmission based on the first waveform configuration to the semi-static waveform configuration upon expiration of the duration of time. In some aspects, the duration of time may be preconfigured, configured via RRC signaling, or indicated within the indication. In some aspects, the duration of time may be comprised of at least one of at least one time slot, at least one OFDM symbol, or an absolute period of time.

FIG. 10 is a diagram 1000 illustrating an example of a hardware implementation for a network entity 1002. The network entity 1002 may be a BS, a component of a BS, or may implement BS functionality. The network entity 1002 may include at least one of a CU 1010, a DU 1030, or an RU 1040. For example, depending on the layer functionality handled by the component 199, the network entity 1002 may include the CU 1010; both the CU 1010 and the DU 1030; each of the CU 1010, the DU 1030, and the RU 1040; the DU 1030; both the DU 1030 and the RU 1040; or the RU 1040. The CU 1010 may include a CU processor 1012. The CU processor 1012 may include on-chip memory 1012′. In some aspects, the CU 1010 may further include additional memory modules 1014 and a communications interface 1018. The CU 1010 communicates with the DU 1030 through a midhaul link, such as an F1 interface. The DU 1030 may include a DU processor 1032. The DU processor 1032 may include on-chip memory 1032′. In some aspects, the DU 1030 may further include additional memory modules 1034 and a communications interface 1038. The DU 1030 communicates with the RU 1040 through a fronthaul link. The RU 1040 may include an RU processor 1042. The RU processor 1042 may include on-chip memory 1042′. In some aspects, the RU 1040 may further include additional memory modules 1044, one or more transceivers 1046, antennas 1080, and a communications interface 1048. The RU 1040 communicates with the UE 104. The on-chip memory 1012′, 1032′, 1042′ and the additional memory modules 1014, 1034, 1044 may each be considered a computer-readable medium/memory. Each computer-readable medium/memory may be non-transitory. Each of the processors 1012, 1032, 1042 is responsible for general processing, including the execution of software stored on the computer-readable medium/memory. The software, when executed by the corresponding processor(s) causes the processor(s) to perform the various functions described supra. The computer-readable medium/memory may also be used for storing data that is manipulated by the processor(s) when executing software.

As discussed supra, the component 199 is configured to output an indication for a UE to switch to a first waveform configuration for uplink transmission over a period of time; and obtain the uplink transmission within the period of time and based on the first waveform configuration. The component 199 may be within one or more processors of one or more of the CU 1010, DU 1030, and the RU 1040. The component 199 may be one or more hardware components specifically configured to carry out the stated processes/algorithm, implemented by one or more processors configured to perform the stated processes/algorithm, stored within a computer-readable medium for implementation by one or more processors, or some combination thereof. The network entity 1002 may include a variety of components configured for various functions. In one configuration, the network entity 1002 includes means for outputting an indication for a user equipment (UE) to switch to a first waveform configuration for uplink transmission over a period of time. The network entity includes means for obtaining the uplink transmission within the period of time and based on the first waveform configuration. The network entity further includes means for outputting a semi-static waveform configuration prior to outputting the indication to switch to the first waveform configuration. The first waveform configuration is configured to expire after a duration of time. The network entity further includes means for switching from receiving the uplink transmission based the first waveform configuration to the semi-static waveform configuration upon expiration of the duration of time. The network entity further includes means for switching to reception of uplink communication based on the first waveform configuration after a time period following the indication. The time period comprises a processing time to switch to the first waveform configuration. The network entity further includes means for receiving an acknowledgement in response to the indication comprising the first waveform configuration. Activation of the first waveform configuration is based on a time of transmission of the acknowledgement. The means may be the component 199 of the network entity 1002 configured to perform the functions recited by the means. As described supra, the network entity 1002 may include the TX processor 316, the RX processor 370, and the controller/processor 375. As such, in one configuration, the means may be the TX processor 316, the RX processor 370, and/or the controller/processor 375 configured to perform the functions recited by the means.

Aspect 1 is a method of wireless communication at a UE, comprising receiving an indication to switch to a first waveform configuration for uplink transmission over a period of time; and transmitting the uplink transmission based on the first waveform configuration during the period of time.

Aspect 2 is the method of Aspect 1, further includes that the indication is received in a group common DCI, a UE-specific DCI, or a MAC-CE.

Aspect 3 is the method of any of Aspects 1 and 2, further includes that the first waveform configuration comprises at least one of a filtering configuration or a pulse shape.

Aspect 4 is the method of any of Aspects 1-3, further includes that the indication comprises enabling or disabling of a transform precoding.

Aspect 5 is the method of any of Aspects 1-4, further includes that the first waveform configuration is for CP-OFDM or DFT-s-OFDM.

Aspect 6 is the method of any of Aspects 1-5, further including receiving a semi-static waveform configuration prior to receiving the indication to switch to the first waveform configuration, wherein the first waveform configuration is configured to expire after a duration of time; and switching from the first waveform configuration to the semi-static waveform configuration upon expiration of the duration of time.

Aspect 7 is the method of any of Aspects 1-6, further includes that the duration of time is preconfigured, configured via RRC signaling, or indicated within the indication, wherein the duration of time is comprised of at least one of at least one time slot, at least one OFDM symbol, or an absolute period of time.

Aspect 8 is the method of any of Aspects 1-7, further including switching to uplink communication based on the first waveform configuration after a time period following receipt of the indication, wherein the time period comprises a processing time to switch to the first waveform configuration.

Aspect 9 is the method of any of Aspects 1-8, further includes that the first waveform configuration is associated with a subset of uplink transmissions.

Aspect 10 is the method of any of Aspects 1-9, further includes that the first waveform configuration is associated with a single layer MIMO or a multi-layer MIMO.

Aspect 11 is the method of any of Aspects 1-10, further includes that to receive a configured grant of uplink resources, wherein to transmit the uplink transmission further includes transmitting the uplink transmission using one or more uplink resources of the configured grant and with the first waveform configuration based on the uplink transmission corresponding to the subset of the uplink transmissions or based on an additional indication in the configured grant enabling waveform switching or transform precoding switching.

Aspect 12 is the method of any of Aspects 1-11, further includes that transmitting the uplink transmission based on the first waveform configuration includes transmitting the uplink transmission with a change of one or more uplink transmission parameters, wherein the one or more uplink transmission parameters includes at least one of a demodulation reference signal parameter, a phase tracking reference signal configuration, or a contiguous resource block allocation.

Aspect 13 is the method of any of Aspects 1-12, further including switching to the first waveform configuration for a BWP in response to reception of the indication.

Aspect 14 is the method of any of Aspects 1-13, further including transmitting an acknowledgement in response to the indication comprising the first waveform configuration; and activating of the first waveform configuration at an activation time based on transmission of the acknowledgement.

Aspect 15 is an apparatus for wireless communication at a UE including at least one processor coupled to a memory and at least one transceiver, the at least one processor configured to implement any of Aspects 1-14.

Aspect 16 is an apparatus for wireless communication at a UE including means for implementing any of Aspects 1-14.

Aspect 18 is a method for wireless communication at a network node comprising outputting an indication for a UE to switch to a first waveform configuration for uplink transmission over a period of time; and obtaining the uplink transmission within the period of time and based on the first waveform configuration.

Aspect 19 is the method of Aspect 18, further includes that the indication is comprised in a group common DCI, a UE-specific DCI, or a MAC-CE.

Aspect 20 is the method of any of Aspects 18 and 19, further includes that the first waveform configuration comprises at least one of a filtering configuration or a pulse shape.

Aspect 21 is the method of any of Aspects 18-20, further includes that the indication comprises enabling or disabling of a transform precoding.

Aspect 22 is the method of any of Aspects 18-21, further includes that the first waveform configuration is for CP-OFDM or DFT-s-OFDM.

Aspect 23 is the method of any of Aspects 18-22, further including outputting a semi-static waveform configuration prior to outputting the indication to switch to the first waveform configuration, wherein the first waveform configuration is configured to expire after a duration of time; and switching from receiving the uplink transmission based the first waveform configuration to the semi-static waveform configuration upon expiration of the duration of time.

Aspect 24 is the method of any of Aspects 18-23, further includes that the duration of time is preconfigured, configured via RRC signaling, or indicated within the indication.

Aspect 25 is the method of any of Aspects 18-24, further includes that the duration of time is comprised of at least one of at least one time slot, at least one OFDM symbol, or an absolute period of time.

Aspect 26 is the method of any of Aspects 18-25, further including switching to reception of uplink communication based on the first waveform configuration after a time period following the indication, wherein the time period comprises a processing time to switch to the first waveform configuration.

Aspect 27 is the method of any of Aspects 18-26, further includes that the first waveform configuration is associated with a subset of uplink transmissions.

Aspect 28 is the method of any of Aspects 18-27, further includes that the first waveform configuration is associated with a single layer MIMO or a multi-layer MIMO, wherein the first waveform configuration further comprises a change of one or more uplink transmission parameters, wherein the first waveform configuration is associated with a current BWP.

Aspect 29 is the method of any of Aspects 18-28, further including receiving an acknowledgement in response to the indication comprising the first waveform configuration, wherein activation of the first waveform configuration is based on an activation time of transmission of the acknowledgement.

Aspect 30 is an apparatus for wireless communication at a network node including at least one processor coupled to a memory and at least one transceiver, the at least one processor configured to implement any of Aspects 18-29.

Aspect 31 is an apparatus for wireless communication at a network node including means for implementing any of Aspects 18-29.