Method and apparatus for reporting PHR to support dynamic waveform switching

Abstract

A method and apparatus for reporting PHR to support dynamic waveform switching is disclosed. The apparatus includes: a receiver that receives downlink control information (DCI) in an active serving cell that indicates a first waveform or a second waveform for a physical uplink shared channel (PUSCH) transmission; a processor that determines a first power headroom report (PHR) corresponding to the first waveform and a second PHR corresponding to the second waveform; and a transmitter that transmits the first PHR and / or the second PHR for the active serving cell.

Description

[Technical Field]

[0001] The subject matter disclosed herein relates generally to wireless communications, and more particularly, but not exclusively, to a method and apparatus for reporting power headroom reports (PHRs) to support dynamic waveform switching. [Background technology]

[0002] The following abbreviations and acronyms are defined along with this document, at least some of which will be referenced herein.

[0003] 3rd Generation Partnership Project (3GPP®), 5th Generation (5G), New Radio (NR), 5G Node B (gNB), Long Term Evolution (LTE), LTE-Advanced (LTE-A), E-UTRAN Node B (eNB), Universal Mobile Telecommunications System (UMTS), Worldwide Interoperable Microwave Access (WiMAX), Evolved UMTS Terrestrial Radio Access Network (E-UTRAN), wireless local area networking (WLAN), orthogonal frequency division multiplexing (OFDM), single-carrier frequency division multiple access (SC-FDMA), downlink (DL), uplink (UL), user equipment (UE), network equipment (NE), radio access technology (RAT), receiver or receiver (RX, or Rx), transmitter or transmitter (TX, or Tx), Physical Downlink Control Channel (PDCCH), Physical Uplink Shared Channel (PUSCH), Binary Phase Shift Keying (BPSK), Bandwidth Part (BWP), Control Element (CE), Cyclic Prefix (CP), Downlink Control Information (DCI), Frequency Division Multiple Access (FDMA), Index / Identifier (ID), Medium Access Control (MAC), Medium Access Control-Control Element (MAC-CE), Modulation and Coding Scheme (MCS), Quadrature Amplitude Modulation (QAM), Quadrature Phase Shift Keying (QPSK), Resource Block (RB), Radio Resource Control (RRC), Reference Signal (RS), Subcarrier Spacing (SCS), Time Division Multiplexing (TDM), Transmit Receiving Point (TRP), Component Carrier (CC), Dual Connectivity (DC), Discrete Fourier Transform (DFT), E-UTRANR Dual Connectivity (EN-DC), Frequency Range 1 (FR1), Frequency Range 2 (FR2), Maximum Power Reduction (MPR), Peak-to-Average Power Ratio (PAPR), Technical Specification (TS), Universal Terrestrial Radio Access (UTRA), Discrete Fourier Transform Spread Orthogonal Frequency Division Multiplexing (DFT-s-OFDM), Evolved Universal Terrestrial Radio Access (E-UTRA), NR-E-UTRA Dual Connectivity (NE-DC), Universal Terrestrial Radio Access Network (UTRAN), Power Headroom Report (PHR), Cyclic Prefix Orthogonal Frequency Division Multiplexing (CP-OFDM), Path Loss (PL), Path Loss Reference Signal (PL-RS).

[0004] In wireless communications, such as Third Generation Partnership Project (3GPP) mobile networks, a wireless mobile network may provide seamless wireless communication services to wireless communication terminals with mobility, i.e., user equipment (UE). A wireless mobile network may be formed of multiple base stations, which may implement wireless communications with the UE.

[0005] 5G New Radio (NR) is the latest in the series of 3GPP standards and supports ultra-high data rates with lower latency compared to its predecessor, LTE (4G) technology. 3GPP defines two frequency range (FR) types: frequencies in the sub-6 GHz range (450 to 6000 MHz) are called FR1, and frequencies in the millimeter wave range (24.25 GHz to 52.6 GHz) are called FR2. 5G NR supports both FR1 and FR2 frequency bands.

[0006] Enhancements to multi-TRP / panel transmission are being investigated, including improved reliability and robustness with both ideal and non-ideal backhaul between these TRPs (Transmit Receiving Points). A TRP is a device for transmitting and receiving signals and is controlled by the gNB through the backhaul between the gNB and the TRP.

[0007] Two waveforms, namely DFT-s-OFDM and CP-OFDM, are supported in NR UL transmission to take advantage of the advantages of different waveforms in different scenarios.

[0008] For PUSCH transmission with DFT-s-OFDM, only one layer is supported, while a CP-OFDM waveform can support PUSCH transmission of up to eight layers. However, the PAPR of the DFT-s-OFDM waveform is relatively low, and therefore the efficiency of the UE's power amplifier is higher compared to the CP-OFDM waveform. For example, if the UE is in a cell-center location, the PUSCH may be transmitted using CP-OFDM for higher throughput, and if the UE is at the cell edge, the PUSCH may be transmitted using DFT-s-OFDM because it provides better coverage due to its higher power efficiency. Summary of the Invention [Means for solving the problem]

[0009] A method and apparatus for reporting PHR to support dynamic waveform switching is disclosed.

[0010] According to a first aspect, an apparatus is provided that includes: a receiver that receives downlink control information (DCI) in an active serving cell that indicates a first waveform or a second waveform for a physical uplink shared channel (PUSCH) transmission; a processor that determines a first power headroom report (PHR) corresponding to the first waveform and a second PHR corresponding to the second waveform; and a transmitter that transmits the first PHR and / or the second PHR for the active serving cell.

[0011] According to a second aspect, an apparatus is provided that includes: a transmitter that transmits downlink control information (DCI) in an active serving cell, the DCI indicating a first waveform or a second waveform for a physical uplink shared channel (PUSCH) transmission; and a receiver that receives, for the active serving cell, a first power headroom report (PHR) corresponding to the first waveform and / or a second PHR corresponding to the second waveform.

[0012] According to a third aspect, there is provided a method including: receiving, by a receiver, downlink control information (DCI) in an active serving cell indicating a first waveform or a second waveform for a physical uplink shared channel (PUSCH) transmission; determining, by a processor, a first power headroom report (PHR) corresponding to the first waveform and a second PHR corresponding to the second waveform; and transmitting, by a transmitter, the first PHR and / or the second PHR for the active serving cell.

[0013] According to a fourth aspect, there is provided a method including: transmitting, by a transmitter, downlink control information (DCI) in an active serving cell indicating a first waveform or a second waveform for a physical uplink shared channel (PUSCH) transmission; and receiving, by a receiver, a first power headroom report (PHR) corresponding to the first waveform and / or a second PHR corresponding to the second waveform for the active serving cell.

[0014] A more particular description of the embodiments will be given by reference to specific embodiments that are illustrated in the accompanying drawings, which are not to be considered limiting in scope as they depict only some embodiments, and the embodiments will be described and explained with additional specificity and detail using the accompanying drawings. [Brief explanation of the drawings]

[0015] [Figure 1]FIG. 1 is a schematic diagram illustrating a wireless communication system according to some implementations of the present disclosure. [Figure 2] FIG. 1 is a schematic block diagram illustrating components of a user equipment (UE) according to some implementations of the present disclosure. [Figure 3] FIG. 1 is a schematic block diagram illustrating components of a network equipment (NE) according to some implementations of the present disclosure. [Figure 4A] 10A and 10B are schematic block diagrams illustrating examples of actual PUSCH transmissions of different waveforms that overlap slots for transmitting PHRs, according to some implementations of the present disclosure. [Figure 4B] FIG. 1 is a schematic block diagram illustrating examples of PCMAX calculation and PHR for different waveforms, according to some implementations of the present disclosure. [Figure 5A] FIG. 1 is a schematic block diagram illustrating an example of one single-entry PHR MAC-CE for PHR reporting for different waveforms, in accordance with some implementations of the present disclosure. [Figure 5B] FIG. 1 is a schematic block diagram illustrating an example of a separate single-entry PHR MAC-CE for PHR reporting for a waveform, in accordance with some implementations of the present disclosure. [Figure 5C] 1 is a schematic block diagram illustrating an example of a separate multiple-entry PHR MAC-CE for PHR reporting for a waveform for a UE configured with multiple serving cells, in accordance with some implementations of the present disclosure. [Figure 6] FIG. 1 is a schematic block diagram illustrating an example of a path loss variation problem in dynamic waveform switching, in accordance with some implementations of the present disclosure. [Figure 7] 10 is a flowchart illustrating steps for reporting a PHR to support dynamic waveform switching by a UE, according to some implementations of the present disclosure. [Figure 8] 1 is a flowchart illustrating steps for receiving a PHR to support dynamic waveform switching by a gNB, according to some implementations of the present disclosure. DETAILED DESCRIPTION OF THE INVENTION

[0016] As will be appreciated by one skilled in the art, aspects of the embodiments may be embodied as a system, apparatus, method, or program product. Accordingly, the embodiments may take the form of a hardware-only embodiment, a software-only embodiment (including firmware, resident software, microcode, etc.) or an embodiment combining software and hardware aspects.

[0017] Furthermore, one or more embodiments may take the form of a program product embodied in one or more computer-readable storage devices that store machine-readable code, computer-readable code, and / or program code, hereinafter referred to as "code." The storage devices may be tangible, non-transitory, and / or non-transmittable.

[0018] Throughout this specification, reference to "one embodiment," "an embodiment," "an example," "some embodiments," "some examples," or similar language means that a particular feature, structure, or characteristic being described is included in at least one embodiment or example. Thus, throughout this specification, instances of the phrases "in one embodiment," "in an example," "in some embodiments," and similar language may refer to the same embodiment, but not necessarily all. All disclosed embodiments may or may not be included. A feature, structure, element, or characteristic described in connection with one or some embodiments is applicable to other embodiments unless expressly stated otherwise. The terms "including," "comprising," "having," and variations thereof mean "including, but not limited to," unless expressly stated otherwise.

[0019] An enumerated list of items does not imply that any or all of the items are mutually exclusive unless expressly stated otherwise. The terms "a," "an," and "the" also refer to "one or more," and similarly, items expressed in the plural also include a reference to one or more instances of that item unless expressly stated otherwise.

[0020] Throughout this disclosure, all terms such as "first," "second," "third," etc. are used solely as designations to refer to relevant devices, components, procedural steps, etc., without implying any spatial or chronological order, unless otherwise specified. For example, a "first device" and a "second device" may refer to two separately formed devices or two parts or components of the same device. In some cases, for example, a "first device" and a "second device" may be the same and may be arbitrarily named. Similarly, a "first step" of a method or process may be carried out or performed after or concurrently with a "second step."

[0021] The term "and / or," as used herein, should be understood to refer to and include all possible combinations of one or more of the associated listed items. For example, "A and / or B" can refer to any of three combinations: the presence of A alone, the presence of B alone, and the coexistence of both A and B. The character " / " generally indicates an "or" relationship between the associated items. However, it can also include an "and" relationship between the associated items. For example, "A / B" means "A or B," but it can also include the coexistence of both A and B unless the context indicates otherwise.

[0022] Furthermore, the described features, structures, or characteristics of the embodiments may be combined in any suitable manner. In the following description, numerous specific details are provided, such as examples of programming, software modules, user selections, network transactions, database queries, database structures, hardware modules, hardware circuits, hardware chips, etc., to provide a thorough understanding of the embodiments. However, those skilled in the art will recognize that the embodiments may be practiced without one or more of the specific details, or with other methods, components, materials, etc. In other instances, well-known structures, materials, or operations are not shown or described in detail to avoid obscuring aspects of the embodiments.

[0023] Aspects of various embodiments are described below with reference to schematic flowchart illustrations and / or schematic block diagrams of methods, apparatus, systems, and program products. It will be understood that each block of the schematic flowchart illustrations and / or schematic block diagrams, and combinations of blocks in the schematic flowchart illustrations and / or schematic block diagrams, may be implemented by code. This code may be provided to a processor of a general-purpose computer, special-purpose computer, or other programmable data processing apparatus to produce machines, whereby the instructions, executed by the processor of the computer or other programmable data processing apparatus, create means for implementing the functions or acts specified in the schematic flowchart illustrations and / or schematic block diagrams.

[0024] The code may be stored in a storage device that can instruct a computer, other programmable data processing apparatus, or other device to function in a particular manner, such that the instructions stored on the storage device create an article of manufacture that includes instructions that implement the functions or acts specified in the schematic flowchart diagrams and / or schematic block diagrams.

[0025] The schematic flowchart diagrams and / or schematic block diagrams in the figures illustrate the architecture, functionality, and operation of possible implementations of different apparatus, systems, methods, and program products according to various embodiments. In this regard, each block in the schematic flowchart diagrams and / or schematic block diagrams may represent a module, segment, or portion of code, which comprises one or more executable instructions of code for implementing the specified logical function(s). However, those skilled in the art will recognize that the flowchart diagrams do not necessarily have to be practiced in the order shown, and may be practiced without one or more of the specific steps, or with other steps not shown.

[0026] It should also be noted that, in some alternative implementations, the functions noted in the identified blocks may occur out of the order noted in the figures. For example, two blocks shown in succession may, in fact, be executed substantially concurrently, or the blocks may sometimes be executed in the reverse order, depending upon the functionality involved.

[0027] 1 is a schematic diagram illustrating a wireless communication system. An embodiment of a wireless communication system 100 is shown. In one embodiment, the wireless communication system 100 may include user equipment (UE) 102 and network equipment (NE) 104. While a particular number of UEs 102 and NEs 104 are shown in FIG. 1, those skilled in the art will understand that any number of UEs 102 and NEs 104 may be included in the wireless communication system 100.

[0028] The UE 102 may also be referred to as a remote device, remote unit, subscriber unit, mobile, mobile station, user, terminal, mobile terminal, fixed terminal, subscriber station, user terminal, apparatus, device, user device, or other terminology used in the art.

[0029] In one embodiment, the UE 102 may be an autonomous sensor device, an alarm device, an actuator device, a remote control device, etc. In some other embodiments, the UE 102 may include a computing device such as a desktop computer, a laptop computer, a personal digital assistant (PDA), a tablet computer, a smartphone, a smart television (e.g., an Internet-connected television), a set-top box, a game console, a security system (including security cameras), an in-vehicle computer, a network device (e.g., a router, a switch, a modem), etc. In some embodiments, the UE 102 includes a wearable device such as a smart watch, a fitness band, an optical head-mounted display, etc. The UE 102 may communicate directly with one or more of the NEs 104.

[0030] The NE 104 may also be referred to as a base station, access point, access terminal, base, Node B, eNB, gNB, Home Node B, relay node, apparatus, device, or any other terminology used in the art. Throughout this specification, references to a base station may refer to any of the above-mentioned types of network equipment 104, such as eNBs and gNBs.

[0031] The NEs 104 may be distributed throughout a geographic region. The NEs 104 are generally part of a radio access network that includes one or more controllers communicatively coupled to one or more corresponding NEs 104. The radio access network is generally communicatively coupled to one or more core networks, which may be coupled to other networks, such as the Internet and the public switched telephone network. These and other elements of the radio access and core networks are not shown but are generally familiar to those skilled in the art.

[0032] In one implementation, the wireless communication system 100 complies with 3GPP 5G New Radio (NR). In some implementations, the wireless communication system 100 complies with 3GPP protocols, where the NE 104 transmits in the DL using an OFDM modulation scheme and the UE 102 transmits in the uplink (UL) using an SC-FDMA scheme or an OFDM scheme. However, more generally, the wireless communication system 100 may implement some other open or proprietary communication protocol, for example, WiMAX. This disclosure is not intended to be limited to any particular wireless communication system architecture or protocol implementation.

[0033] The NE 104 may serve several UEs 102 within a serving area, e.g., a cell (or cell sector) or more cells, via wireless communication links. The NE 104 transmits DL communication signals to serve the UEs 102 in the time, frequency, and / or spatial domains.

[0034] A communication link is provided between the NE 104 and the UEs 102a, 102b, which may be, for example, an NR UL or DL ​​communication link. Several UEs 102 may communicate simultaneously over different radio access technologies (RATs), such as NR and LTE. Direct or indirect communication links between two or more NEs 104 may be provided.

[0035] The NE 104 may also include one or more transmit reception points (TRPs) 104a. In some embodiments, the network equipment may be a gNB 104 that controls several TRPs 104a. Additionally, there is a backhaul between two TRPs 104a. In some other embodiments, the network equipment may be a TRP 104a controlled by a gNB.

[0036] A communication link is provided between each NE 104, 104a and each UE 102, 102a, which may be, for example, an NR UL / DL communication link. Several UEs 102, 102a may communicate simultaneously over different radio access technologies (RATs), such as NR and LTE.

[0037] In some embodiments, the UE 102a may be capable of simultaneously communicating with two or more TRPs 104a using non-ideal or ideal backhaul. A TRP may be a transmission point of a gNB. Multiple beams may be used by the UE and / or the TRP. The two or more TRPs may be of different gNBs or of the same gNB. That is, different TRPs may have the same cell ID or different cell IDs. The terms “TRP,” “transmit receiving point,” and “transmit receiving identity” may be used interchangeably throughout this disclosure.

[0038] 2 is a schematic block diagram illustrating components of a user equipment (UE) according to one embodiment. The UE 200 may include a processor 202, a memory 204, an input device 206, a display 208, and a transceiver 210. In some embodiments, the input device 206 and the display 208 are combined into one device, such as a touchscreen. In some embodiments, the UE 200 may not include any input device 206 and / or display 208. In various embodiments, the UE 200 may include one or more processors 202, or may not include the input device 206 and / or the display 208.

[0039] The processor 202, in one embodiment, may include any known controller capable of executing computer-readable instructions and / or performing logical operations. For example, the processor 202 may be a microcontroller, microprocessor, central processing unit (CPU), graphics processing unit (GPU), auxiliary processing unit, field programmable gate array (FPGA), or similar programmable controller. In some embodiments, the processor 202 executes instructions stored in the memory 204 to implement the methods and routines described herein. The processor 202 is communicatively coupled to the memory 204 and the transceiver 210.

[0040] Memory 204, in one embodiment, is a computer-readable storage medium. In some embodiments, memory 204 includes a volatile computer storage medium. For example, memory 204 may include RAM, including dynamic RAM (DRAM), synchronous dynamic RAM (SDRAM), and / or static RAM (SRAM). In some embodiments, memory 204 includes a non-volatile computer storage medium. For example, memory 204 may include a hard disk drive, flash memory, or any other suitable non-volatile computer storage device. In some embodiments, memory 204 includes both volatile and non-volatile computer storage media. In some embodiments, memory 204 stores data related to trigger conditions for transmitting measurement reports to network devices. In some embodiments, memory 204 also stores program code and associated data.

[0041] The input device 206, in one embodiment, may include any known computer input device, including a touch panel, buttons, a keyboard, a stylus, a microphone, etc. In some embodiments, the input device 206 may be integrated with the display 208, for example, as a touchscreen or similar touch display.

[0042] Display 208, in one embodiment, may include any known electronically controllable display or display device. Display 208 may be designed to output visual, auditory, and / or tactile signals.

[0043] The transceiver 210, in one embodiment, is configured to communicate wirelessly with network equipment. In some embodiments, the transceiver 210 comprises a transmitter 212 and a receiver 214. The transmitter 212 is used to transmit UL communication signals to the network equipment, and the receiver 214 is used to receive DL communication signals from the network equipment.

[0044] The transmitter 212 and receiver 214 may be any suitable type of transmitter and receiver. Although only one transmitter 212 and one receiver 214 are shown, the transceiver 210 may have any suitable number of transmitters 212 and receivers 214. For example, in some embodiments, the UE 200 includes multiple transmitter 212 and receiver 214 pairs for communicating over multiple wireless networks and / or radio frequency bands, each of the transmitter 212 and receiver 214 pairs configured to communicate over a different wireless network and / or radio frequency band.

[0045] 3 is a schematic block diagram illustrating components of a network equipment (NE) 300 according to one embodiment. The NE 300 may include a processor 302, a memory 304, an input device 306, a display 308, and a transceiver 310. As can be appreciated, the processor 302, the memory 304, the input device 306, the display 308, and the transceiver 310 may be similar to the processor 202, the memory 204, the input device 206, the display 208, and the transceiver 210 of the UE 200, respectively.

[0046] In some embodiments, the processor 302 controls the transceiver 310 to transmit DL signals or data to the UE 200. The processor 302 also controls the transceiver 310 to receive UL signals or data from the UE 200. In another example, the processor 302 may control the transceiver 310 to transmit DL signals to the UE 200 that include various configuration data.

[0047] In some embodiments, the transceiver 310 comprises a transmitter 312 and a receiver 314. The transmitter 312 is used to transmit DL communication signals to the UE 200, and the receiver 314 is used to receive UL communication signals from the UE 200.

[0048] The transceiver 310 may communicate with multiple UEs 200 simultaneously. For example, the transmitter 312 may transmit DL communication signals to the UEs 200. As another example, the receiver 314 may simultaneously receive UL communication signals from the UEs 200. The transmitter 312 and receiver 314 may be any suitable type of transmitter and receiver. Although only one transmitter 312 and one receiver 314 are shown, the transceiver 310 may have any suitable number of transmitters 312 and receivers 314. For example, the NE 300 may serve multiple cells and / or cell sectors, in which case the transceiver 310 includes a transmitter 312 and receiver 314 for each cell or cell sector.

[0049] Two waveforms, namely, DFT-s-OFDM and CP-OFDM, are supported in NR UL transmission to facilitate the advantages of different waveforms in different scenarios. When transform precoding is disabled, DFT-s-OFDM is used for UL transmission, and when transform precoding is enabled, CP-OFDM is used. In RAN1 #110b, it was agreed that DCI-level waveform switching between DFT-s-OFDM and CP-OFDM is supported, but when and how a gNB may decide to switch waveforms is still under discussion. In RAN1 #111, PHR was proposed as a candidate metric to assist a gNB in ​​waveform selection. However, the current PHR is based on a configured waveform, which does not support dynamic waveform switching. Enhancements on how to calculate PHRs corresponding to different waveforms and how to report PHRs for different waveforms are provided in this disclosure.

[0050] Furthermore, the PHR triggering event may also need to be enhanced. For example, if the path loss (PL) variation in two adjacent PHRs changes more than phr-Tx-PowerFactorChange dB, the PHR will be triggered according to the current triggering event. However, with dynamic waveform switching, if the path loss reference signals (PL-RS) used to calculate the PHR for different waveforms are different, whether one or two PLs measured based on the PL-RS are used to determine the PL variation and how to determine the PL variation will also be discussed in this disclosure.

[0051] Below is an example of a PH report as specified in 3GPP's current technical specification TS38.213. 7.7.1 Type 1 PH Report If the UE determines that the Type 1 power headroom report for the activated serving cell is based on an actual PUSCH transmission, then for a PUSCH transmission opportunity i in an active UL BWP b of carrier f of serving cell c, the UE may update the Type 1 power headroom report as follows:

number

number

number

number

[0043] If providing a Type 1 power headroom report for the actual PUSCH repetitions associated with - the UE receives a second RS resource index q in slot n; d , the UE should transmit a PUSCH repetition associated with a second RS resource index q that overlaps with slot n. d providing a Type 1 power headroom report for a first actual PUSCH repetition associated with Otherwise, the UE shall determine the second RS resource index q d providing a Type 1 power headroom report for a reference PUSCH transmission associated with - Otherwise, the UE selects the first RS resource index q d , the UE may provide a Type 1 power headroom report for a reference PUSCH transmission associated with the second RS resource index q d provides a Type 1 power headroom report for a reference PUSCH transmission associated with

[0052] Below is an example of UE maximum power reduction as specified in 3GPP's current technical specification TS38.101. 6.2.2.3 UE maximum output power reduction for power class 3 For power class 3, the MPR for contiguous allocation is MPR = max(MPR WT ,MPR narrow ) It is defined as follows: Transmission bandwidth setting of 200 MHz or less, and 0 ≤ RB start <Ceil(1 / 3N RB ) or Ceil((2 / 3N RB )-L CRB ) <RB start ≦N RB -L CRB In contrast, - BW alloc,RB When is 1.44MHz or less, MPR narrow = 2.5 dB, - 1.44MHz <BW alloc,RB ≦4.32MHz, MPR narrow = 2.0 dB, - Otherwise, MPR narrow =0dB. MPR WT is the maximum power reduction due to the modulation order, transmit bandwidth setting, and waveform type listed in Table 5.3.2-1. WT is defined for FR2-1 in Table 6.2.2.3-1. [Table 1] MPR WT is defined for FR2-2 in Table 6.2.2.3-1b (Table 2). [Table 2]

[0053] PHR calculation for each waveform Type 1: The UE power headroom (PH) is less than the UE configured maximum transmit power P CMAXand the power requirement for PUSCH transmission during the activation BWP of the serving cell, assuming no upper limit on the transmit power for PUSCH transmission. The Type 1 PHR can be calculated based on the actual PUSCH transmission, i.e., the actual PHR, or based on a reference PUSCH transmission, i.e., the virtual PHR.

[0054] If the UE determines that the Type 1 power headroom report for the activated BWP of the serving cell is based on the actual PUSCH transmission, the UE may calculate the Type 1 power headroom report, i.e., the actual PHR, as

number

number

[0055] If the UE determines that the Type 1 power headroom report is based on the reference PUSCH transmission, the UE may generate the Type 1 power headroom report, i.e., the virtual PHR, as

number

number

[0056] P CMAX is the UE configured maximum output power calculated by the UE using some MPR values ​​according to TS38.101. Two waveforms, namely CP-OFDM and DFT-s-OFDM, are supported for PUSCH transmission in NR Rel-15. DFT-s-OFDM supports only single-layer transmission for limited coverage scenarios, while CP-OFDM supports multi-layer PUSCH transmission for higher data rate transmissions. Furthermore, according to TS38.101, different P CMAX The value may be determined because the modulation scheme and RB allocation may be different for PUSCH transmissions with different waveforms. For PHR calculation based on actual PUSCH transmissions, the parameter Δ TF,b,f,c (i) may also be different for different waveforms, as it is determined by the indicated modulation scheme, the number of allocated RBs, and the number of layers for the scheduled PUSCH.

[0057] To assist gNBs in dynamic waveform selection, a waveform-specific PHR is introduced. The following three cases are considered for each PHR corresponding to different waveforms: CMAX and is considered for the calculation of pH.

[0058] Case 1: There is an actual PUSCH transmission using both different waveforms that overlaps with the slot of a PHR report. FIG. 4A is a schematic block diagram illustrating an example of actual PUSCH transmissions of different waveforms that overlap with slots transmitting PHRs, according to some implementations of the present disclosure.

[0059] For the case where there is actual PUSCH transmission using CP-OFDM and DFT-s-OFDM that overlaps with the slot in which the PHR is transmitted, CMAXand PH can be calculated based on the corresponding actual PUSCH transmission of each waveform. This means that equation (1) is used to calculate the actual PHR for different waveforms, and the parameters of equation (1) depend on the actual PUSCH transmission using the corresponding waveform. If there are multiple actual PUSCH transmissions corresponding to waveforms that overlap with the slot in which the PHR is transmitted, P CMAX and PH are calculated based on the first PUSCH transmission of a waveform that overlaps with the slot of the PHR report. The first PUSCH transmission may be the PUSCH with the earliest start symbol among the PUSCH transmissions that overlap with the slot of the PHR report.

[0060] FIG. 4A illustrates a case where an actual PUSCH transmission 402 (i.e., PUSCH #1) using CP-OFDM and an actual PUSCH transmission 404 (i.e., PUSCH #2) using DFT-s-OFDM overlap with the slot for the PHR transmission 410. That is, there is one actual PUSCH transmission whose waveform overlaps in the time domain with the slot of the first PHR and / or second PHR transmission. When there is one activated serving cell, different PUSCH transmissions with different waveforms may be transmitted by TDM within a slot, as shown by part (a) of FIG. 4A. When there are multiple activated serving cells, different PUSCH transmissions with different waveforms may be transmitted by TDM within or between slots, as shown by part (b) of FIG. 4A, where the subcarrier spacing (SCS) of the UL active bandwidth part (BWP) in the first component carrier CC #1 and the second component carrier CC #2 are different. In this example, PHR 410 is transmitted over CC#1, and PUSCH#1 402 and PUSCH#2 404 are transmitted over CC#2.

[0061] In some examples of the present disclosure, when there are one or more PUSCH transmissions corresponding to CP-OFDM and / or one or more PUSCH transmissions corresponding to DFT-s-OFDM that overlap with the slot in which the PHR is reported, the UE may calculate a PH value for each waveform based on the first, i.e., earliest, actual PUSCH transmission that corresponds to the waveform and overlaps with the slot of the PHR report.

[0062] FIG. 4B illustrates a P CMAX 4 is a schematic block diagram illustrating an example of the calculation of PHR for different waveforms. In this example, a UE is configured with two serving cells for PUSCH transmission, where the SCS of the active UL BWP of CC#1 is 15 KHz and the SCS of the active UL BWP of CC#2 is 30 KHz. The UE provides a Type 1 power headroom report PHR 410 during PUSCH transmission in a slot on the active UL BWP of CC#1.

[0063] In CC#2, dynamically scheduled PUSCHs are transmitted with repetitions 402a and 402b (i.e., PUSCH#1 and PUSCH#2) in slot n, and the prescribed waveform is CP-OFDM. Configuration grant PUSCH#3 404 is transmitted using DFT-s-OFDM in slot n+1. In this case, both slots n and n+1 of CC#2 overlap with the slot of CC#1 where PHR 410 is reported.

[0064] The UE then determines the PUSCH of the CP-OFDM based on PUSCH#1 since it is the first, i.e., earliest, PUSCH of the CP-OFDM. CMAX and PHR are calculated, and PHR of DFT-s-OFDM is calculated based on PUSCH#3, which is the only PUSCH of DFT-s-OFDM. CMAX and calculate pH.

[0065] Case 2: There is no actual PUSCH transmission of the eigenwaveform that overlaps with the slot in which the PHR is transmitted. For cases where there may be only a specific waveform or one or more actual PUSCH transmissions with the waveforms used in the current PHR transmission opportunity, CMAX and PHR may be calculated by equation (1) based on the first actual PUSCH transmission that overlaps with the slot of the PHR report.

[0066] Since there is no actual PUSCH transmission for the other waveform in the current PHR transmission opportunity, i.e., the unused waveform, P CMAX It needs to be determined how to calculate pH. The following method is suggested:

[0067] Method 1: The PHR for the other waveform is calculated based on the virtual PHR. Since there is no actual PUSCH transmission corresponding to the other waveform, ie, the unused waveform, in the current PHR transmission opportunity, the PHR may be denoted as a virtual PHR and is calculated based on equation (2).

[0068] Method 1-1: All parameters for the calculation of the virtual PHR are predefined and waveform-specific.

[0069] As shown in equation (2) in the current standard, the relevant parameters in equation (2) are predefined and independent of the waveform. To reflect the PH difference between different waveforms with virtual PH, different sets of parameters for calculating the virtual PH, such as modulation scheme, RB allocation (i.e., edge RB allocation, outer RB allocation, or inner RB allocation), and the number of scheduled RBs, are predefined for different waveforms. The sets of parameters may be configured to be the same or different for different waveforms. When the UE detects the P of the other waveform, CMAX When ρ and PH need to be reported, the corresponding set of predefined parameters is used in equation (2).

[0070] Method 1-2: P of the other waveform CMAX is calculated based on the actual PUSCH transmission.

[0071] P of the other waveform in equation (2) CMAX is enhanced to be calculated by assuming an actual PUSCH transmission using the other waveform, and the scheduled parameters of the assumed PUSCH are the same as the true actual PUSCH transmission, and P in equation (2) CMAX The other parameters are the same as those specified in the standard, except for P for the other waveform. CMAX The values ​​of the parameters for calculating are the same as for the actual scheduled PUSCH transmission, but the interpretation of the parameters is different for different waveforms. For example, even if the MCS values ​​for different waveforms are the same, different modulation schemes may be determined because different MCS tables for different waveforms are specified in TS38.214. In this example, the PHR for the unused waveform in the current PHR transmission opportunity is the virtual PHR based on equation (2), even though the parameters are derived from the actual PUSCH of the waveform used.

[0072] The UE may set its maximum output power based on the waveform of the PUSCH transmission, the RB allocation for the PUSCH transmission, the modulation scheme, etc. CMAX are both calculated based on the actual PUSCH transmission, but the P CMAX Similarly, PHRs with different waveforms may have different P CMAX The PHR corresponding to the waveform instructed or used is also the actual PHR, and the PHR corresponding to the other waveform is the virtual PHR. Therefore, the reported PHRs for different waveforms from the UE may differ. CMAX and PHR may assist gNB in ​​waveform switching.

[0073] Method 2: The PHR for the other waveform is calculated based on the actual PHR. In this method, the P of the waveform that is not used in the current PHR transmission opportunity CMAXand PHR is calculated based on the assumed actual PUSCH transmission by assuming that the transmission is scheduled with the same parameter values ​​as the current actual PUSCH transmission of the waveform used according to equation (1) as the actual PHR.

[0074] The values ​​of the scheduled parameters of the assumed PUSCH transmission of the unused waveform are the same as those of the actual PUSCH transmission, but the interpretation is based on the unused waveform when calculating the PHR for the other waveform, as in Method 1-2. CMAX may be different as explained in Method 1-2. Different waveforms of PH may also have different P CMAX , and Δ associated with the modulation scheme TF,b,f,c It may differ depending on the item. CMAX and PH may assist the gNB in ​​waveform switching. In this method, the PH for the other waveform is calculated based on the actual PUSCH transmission according to equation (1), so the following parameters should be determined:

[0075]

number

number

number

[0076] As a first method, when calculating the PHR for DFT-s-OFDM,

number

number

number

number

[0077] Δ TF,b,f,c This parameter is a modulation scheme dependent offset for adjusting the transmit power, and when deltaMCS for the serving cell is configured,

number

number

[0078] Case 3: There is no actual PUSCH transmission corresponding to any waveform that overlaps with the slot in which the PHR is transmitted. For the case where there is no actual PUSCH transmission corresponding to either of the two waveforms, i.e., there is no actual PUSCH transmission using CP-OFDM and there is no actual PUSCH transmission using DFT-s-OFDM that sufficiently overlaps with the slot for which the PHR is reported, the PHR for each waveform is a virtual PHR, which is calculated by Equation (2). To reflect the difference in PHR between different waveforms, Method 1 in Case 2 may be reused for each waveform. That is, all parameters for calculating the virtual PHR are pre-defined and waveform-specific. The parameters may include, for example, the modulation scheme, the RB allocation (i.e., edge RB allocation, outer RB allocation, or inner RB allocation), and the number of scheduled RBs. The parameter sets may be configured to be the same or different for different waveforms.

[0079] PHR report for each waveform The UE can then compare the P CMAX After calculating the PHR and PH, the UE shall report these values ​​to the gNB for waveform selection. If the UE is not configured with a waveform-specific PHR, the UE shall select one PHR to report and its corresponding PHR. CMAX should be selected.

[0080] For some examples, the UE may select the P H and P H corresponding to the indicated waveform that corresponds to the first, i.e., earliest, actual PUSCH transmission. CMAX Alternatively, the UE may always report PH and P corresponding to the other waveform. CMAX may always be reported.

[0081] For some other examples, the UE may use PH and P corresponding to CP-OFDM. CMAX Alternatively, the UE may always report PH and P corresponding to DFT-s-OFDM. CMAX may always be reported.

[0082] If the UE is configured to report two PHRs for both waveforms, how can the UE report different PHRs? CMAX Whether to report PH should be determined to avoid ambiguity between the UE and the gNB.

[0083] In some examples, the UE may CMAX Alternatively, the UE may report P for only the other waveform. CMAX All you need to do is report the P CMAX The remaining terms except for , are the same, and the PH for the other waveform can be inferred or derived by the gNB. CMAX and reports P for the other waveform only CMAX This means reporting

[0084] In some examples, whether the UE can report one PHR or two PHRs for different waveforms depends on the UE's capabilities. If the UE reports that it is capable of reporting two PHRs for different waveforms, the gNB may configure the UE via RRC signaling to report one PHR or two PHRs for different waveforms.

[0085] In order to report different PHRs for different waveforms to the gNB, the following method is proposed:

[0086] Method 1: Different P for different waveforms CMAX and / or PH reported in one PHR MAC-CE FIG. 5A is a schematic block diagram illustrating an example of one single-entry PHR MAC-CE for PHR reporting for different waveforms, in accordance with some implementations of the present disclosure.

[0087] In this example, P, corresponding to CP-OFDM and DFT-s-OFDM for the serving cell, CMAX Two sets of PHRs are reported in one MAC-CE. To indicate whether the PHR is real or virtual, we use the P CMAX For each set of PHs, a virtual designation may be given. For example, the PHR MAC-CE may assign a first PH 512, a first P CMAX 514, and a first virtual indication 516. The PHR MAC-CE may also include a second PH 522, a second P CMAX 524, and a second virtual indication 526.

[0088] To avoid ambiguity between the UE and the gNB, each P CMAX And / or for PH, the corresponding waveform should also be defined. One way is to define the first P, which means that it is in the first place in MAC-CE. CMAX and / or PH, or P in the first position in PHR MAC-CE CMAXand / or PH is always an indication or configured waveform of the first PUSCH transmission that overlaps with the slot of the PHR transmission, and the second P CMAX and / or PH is always the same for the other waveform. Another method is to CMAX and / or PH is always for one particular waveform, e.g., CP-OFDM (or DFT-s-OFDM), and the second P CMAX and / or PH is always that of the other waveform, for example DFT-s-OFDM (or CP-OFDM).

[0089] For multiple-entry PHR MAC-CE for PHR reporting for different waveforms in multiple serving cells, the same rules as for single-entry PHR MAC-CE apply for PHR reporting for each serving cell. That is, in each serving cell configured to report waveform-specific PHR, different PHRs for different waveforms can be configured. CMAX and / or PH is reported for each serving cell.

[0090] Method 2: Different P for different waveforms CMAX and PH are reported in separate PHR MAC-CE FIG. 5B is a schematic block diagram illustrating an example of a separate single-entry PHR MAC-CE for PHR reporting for a waveform, in accordance with some implementations of the present disclosure.

[0091] In this method, the PH and P for different waveforms CMAX Different sets of PHR MAC-CEs are reported in different MAC-CEs by separate PHR procedures. To avoid ambiguity between the UE and the gNB, a new or reserved field in the PHR MAC-CE can be used to indicate which PHR MAC-CE is for which waveform. In this example, the PHR MAC-CE is CMAX 514, and waveform indication 510.

[0092] As shown in Figure 5B, a 1-bit "W" field (i.e., the original reserved bit) may be used to indicate for which waveform the PHR MAC-CE is reported. For example, if "W" is "0", it means that the P CMAX and PH may indicate that the PHR MAC-CE including the PH is for CP-OFDM (or DFT-s-OFDM), and if "W" is "1", it may indicate that the PHR MAC-CE is for DFT-s-OFDM (or CP-OFDM).

[0093] 5C is a schematic block diagram illustrating an example of a separate multiple-entry PHR MAC-CE for PHR reporting for a waveform for a UE configured with multiple serving cells, according to some implementations of the present disclosure. The above rules may also be applicable to a UE configured with multiple serving cells. That is, the same rules may be used for PHR reporting for a waveform in each serving cell in the multiple-entry PHR MAC-CE. The PHR is for a waveform in the serving cell, and the PHRs for different serving cells may be for the same or different waveforms.

[0094] However, for a multiple-entry PHR MAC-CE, there may not be enough reserved bits to indicate the waveform, and a new field for waveform indication may be introduced to indicate for which waveform the corresponding PHR in the PHR MAC-CE is reported. Each W indicates the waveform corresponding to the PHR for each serving cell. As shown in Figure 5C, the multiple-entry PHR MAC-CE can use the PH and P CMAX Multiple sets of, for example, PH and P CMAX The first set, second set, and third set of PH and P CMAX The first set includes the first PH512, the first P CMAX 514, a first virtual indication 516, and a first waveform indication 510. CMAX The second set includes the second PH522, the second PCMAX 524, a second virtual indication 526, and a second waveform indication 520. CMAX The third set includes the third PH532, the third P CMAX 534, a third virtual indication 536, and a third waveform indication 530.

[0095] PHR Triggering Events In the current standard, a Power Headroom Report (PHR) shall be triggered if the PL has changed by more than phr-Tx-PowerFactorChange dB for at least one activated serving cell of any MAC entity whose active DL BWP is not a dormant BWP since the phr-ProhibitTimer expires or since the last transmission of a PHR in this MAC entity when it has expired and the MAC entity has UL resources for a new transmission.

[0096] The path loss (PL) variation for a cell is the PL measured at the current time for the current PL-RS and the PL measured at the time of transmission of the last transmission of the PHR for the PL-RS in use at the time of transmission, regardless of whether the PL-RS has changed in the meantime.

[0097] In a legacy system, in the active serving cell, a UE reports only one PHR for the configured waveform, and one PL-RS may be determined at each PHR transmission opportunity. Therefore, the PL variation may be the PL change measured based on two PL-RSs at two adjacent PHRs. However, in a dynamic waveform switching scenario, different PHRs for different waveforms may be reported at each PHR transmission opportunity, and multiple PL-RSs may be measured at each PHR transmission if the PL-RSs for calculating the PHRs for the different waveforms are different.

[0098] 6 is a schematic block diagram illustrating an example of a path loss variation problem in dynamic waveform switching according to some implementations of the present disclosure. In this example, four PL-RSs are determined in two consecutive PHR reporting occasions (i.e., PHR transmission occasion n and PHR transmission occasion n+1), where PL-RS#1 602 and PL-RS#4 604 are for CP-OFDM, and PL-RS#2 612 and PL-RS#3 614 are for DFT-s-OFDM. The following method is proposed for how to define the PL variation.

[0099] Method 1: When PL variations are defined within the same waveform, and the phr-ProhibitTimer expires or has already expired, and any PL variation corresponding to the waveform in the serving cell has changed by more than phr-Tx-PowerFactorChange dB, PHR is triggered.

[0100] If the PL-RS used for PHR calculation for different waveforms are different, a waveform-specific PL variation for the cell may be defined. The PL variation for a waveform is the PL measured at the current time in the current PL-RS used for PH calculation for the waveform and the PL measured at the PL-RS currently used for PH calculation for the same waveform at the time of the last transmission of the PHR. That is, the PL variation is compared between the PL measured based on the two PL-RSs for PHR calculation for the same waveform. If either PL variation changes by more than Tx-PowerFactorChange dB, PHR is triggered.

[0101] For example, as shown in Figure 6, the PL variation for CP-OFDM is defined as the PL measured based on PL-RS#4 604 and the PL measured based on PL-RS#1 602, and the PL variation for DFT-s-OFDM is defined as the PL measured based on PL-RS#3 614 and the PL measured based on PL-RS#2 612. If either one of the PL variation for CP-OFDM and the PL variation for DFT-s-OFDM changes by more than Tx-PowerFactorChange dB, a PHR is triggered.

[0102] Method 2: When PL variation is defined within the same waveform and phr-ProhibitTimer expires or has already expired, and the PL variation of the specific waveform has changed by more than phr-Tx-PowerFactorChange dB in the serving cell, PHR is triggered.

[0103] In this method, the waveform-specific PL variations are the same as in Method 1. However, for each waveform, triggering events may cause the PHR to be transmitted more frequently. To reduce overhead, it may be determined that the PHR is triggered if only a predetermined one of the PL variations for CP-OFDM or DFT-s-OFDM changes more than Tx-PowerFactorChange dB.

[0104] Method 3: PL variation is defined between the measured PLs based on the PL-RS used to calculate the first PH (or second PH) during PHR MAC-CE.

[0105] In this method, the PL variation is the PL measured at the current PL-RS used for the first PH calculation (or the second PH calculation) and the PL measured at the PL-RS currently being used for the first PH calculation (or the second PH calculation) in the serving cell at the time of the final transmission of the PHR. The first PH is the PH at the first location in the PHR MAC-CE or the PH at the first position in the PHR MAC-CE, for example, PH#1 512 shown in FIG. 5A. If the phr-ProhibitTimer expires or has already expired and the PL variation has changed by more than Tx-PowerFactorChange dB, a PHR is triggered.

[0106] Method 4: PL variability is defined as the maximum or minimum variability among the PL measured by different PL-RSs.

[0107] In this way, four different PL variation candidates can be calculated, including: 1) PL31 as the PL variation between the PL measured according to PL-RS#3 614 and the PL measured according to PL-RS#1 602; 2) PL32 as the PL variation between the PL measured according to PL-RS#3 614 and the PL measured according to PL-RS#2 612; 3) PL41 as the PL variation between the PL measured according to PL-RS#4 604 and the PL measured according to PL-RS#1 602; and 4) PL42 as the PL variation between the PL measured according to PL-RS#4 604 and the PL measured according to PL-RS#2 612.

[0108] In one example, the PL variation may be defined as the minimum value among four PL variation candidates. When the phr-ProhibitTimer expires or has already expired, and if the minimum value exceeds the Tx-PowerFactorChange dB, the PHR is triggered.

[0109] In another example, the PL variation may be defined as the maximum value among four PL variation candidates, and the PHR is triggered only if the maximum value exceeds Tx-PowerFactorChange dB and the phr-ProhibitTimer expires or has already expired.

[0110] FIG. 7 is a flowchart illustrating steps for reporting a PHR to support dynamic waveform switching by a UE 200 according to some implementations of the present disclosure.

[0111] In step 702, the receiver 214 of the UE 200 receives downlink control information (DCI) in an active serving cell that indicates a first waveform or a second waveform for a physical uplink shared channel (PUSCH) transmission.

[0112] In step 704, the processor 202 of the UE 200 determines a first power headroom report (PHR) corresponding to the first waveform and a second PHR corresponding to the second waveform.

[0113] In step 706, the transmitter 212 of the UE 200 transmits the first PHR and / or the second PHR for the active serving cell.

[0114] FIG. 8 is a flowchart illustrating steps for receiving a PHR to support dynamic waveform switching by a gNB 300 according to some implementations of the present disclosure.

[0115] In step 802, the transmitter 312 of the gNB 300 transmits downlink control information (DCI) in the active serving cell indicating a first waveform or a second waveform for a physical uplink shared channel (PUSCH) transmission.

[0116] In step 804, the receiver 314 of the gNB 300 receives a first power headroom report (PHR) corresponding to a first waveform and / or a second PHR corresponding to a second waveform for an active serving cell.

[0117] In one aspect, some example items of the present disclosure related to UEs may be summarized as follows:

[0118] 1. A receiver that receives downlink control information (DCI) in an active serving cell that indicates a first waveform or a second waveform for a physical uplink shared channel (PUSCH) transmission; a processor that determines a first power headroom report (PHR) corresponding to the first waveform and a second PHR corresponding to the second waveform; a transmitter for transmitting a first PHR and / or a second PHR for an active serving cell; An apparatus comprising:

[0119] 2. The device described in item 1, wherein when the processor determines that there are one or more actual PUSCH transmissions using the first waveform that overlap in time domain with the slots of the transmissions of the first PHR and / or the second PHR, the first PHR is the actual PHR determined based on parameters of the earliest of the actual PUSCH transmissions.

[0120] 3. The device described in item 1, wherein when the processor determines that there is no actual PUSCH transmission using the first waveform that overlaps in the time domain with the slots of the transmission of the first PHR and / or the second PHR, the first PHR is a virtual PHR determined based on a predetermined set of parameters.

[0121] 4. The device described in item 1, wherein when the processor determines that there is no actual PUSCH transmission using the first waveform that overlaps in the time domain with the slots of the transmission of the first PHR and / or the second PHR, the first PHR is the actual PHR determined based on a predetermined set of parameters.

[0122] 5. The device described in item 3 or 4, wherein when the processor determines that there is at least one actual PUSCH transmission of the second waveform that overlaps in the time domain with slots of transmission of the first PHR and / or the second PHR, the predetermined set of parameters for determining the first PHR is derived from a reinterpretation of parameters indicated for the actual PUSCH transmission of the second waveform based on the first waveform.

[0123] 6. The first and second waveforms are selected from discrete Fourier transform spread orthogonal frequency division multiplexing (DFT-s-OFDM) and cyclic prefix orthogonal frequency division multiplexing (CP-OFDM), and the number of layers of the PUSCH transmission is determined by a parameter Δ for the PHR corresponding to the DFT-s-OFDM. TF,b,f,c Item 6. The apparatus according to item 5, wherein for the calculation of

[0124] 7. The apparatus of item 1, wherein the processor is configured to report only one PHR and selects for transmission from the first and second PHRs one PHR corresponding to the earliest actual PUSCH transmission that overlaps in time domain with a slot of transmission of the first PHR and / or the second PHR.

[0125] 8. The apparatus of item 1, wherein the first PHR and the second PHR are reported within one PHR media access control-control element (MAC-CE).

[0126] 9. The apparatus described in item 8, wherein the PHR at the top position in the PHR MAC-CE corresponds to the waveform of the earliest actual PUSCH transmission that overlaps in the time domain with the slot of the transmission of the first PHR and / or the second PHR.

[0127] 10. The apparatus according to item 8, wherein the PHR at the first position in the PHR MAC-CE corresponds to CP-OFDM, and the PHR at the subsequent position in the PHR MAC-CE corresponds to DFT-s-OFDM.

[0128] 11. The device of item 1, wherein each of the first PHR and the second PHR is reported in a separate PHR MAC-CE.

[0129] 12. The apparatus of item 11, wherein the PHR MAC-CE includes a field that indicates the waveform that the PHR in the PHR MAC-CE supports.

[0130] 13. The apparatus of item 1, wherein the receiver further receives radio resource control (RRC) signaling to configure whether one PHR or multiple PHRs for different waveforms should be reported.

[0131] 14. The device of item 1, wherein the processor further determines a path loss (PL) variation for each of the waveforms, and the transmitter transmits the first PHR and / or the second PHR when it determines that the PL variation exceeds phr-Tx-PowerFactorChange for the first waveform, for both waveforms, or for any of the waveforms.

[0132] 15. The device described in item 14, wherein the PL variation for a waveform is determined based on the PL measured at a current time in a current path loss reference signal (PL-RS) for power headroom (PH) calculation of the waveform and the PL measured at that time used at the time of transmission of the final transmission of the PHR in the PL-RS for PH calculation of the same waveform.

[0133] 16. The device described in item 1, wherein the processor further determines a path loss (PL) variation, the PL variation being determined based on the PL currently measured in the current path loss reference signal (PL-RS) for the first PHR and the PL measured at that time that is used at the time of transmission of the final transmission of the PHR in the PL-RS for the first PHR, and the transmitter transmits the first PHR and / or the second PHR when it determines that the PL variation exceeds phr-Tx-PowerFactorChange.

[0134] In another aspect, some example items of the present disclosure relating to gNBs may be summarized as follows:

[0135] 17. A transmitter that transmits downlink control information (DCI) in an active serving cell that indicates a first waveform or a second waveform for a physical uplink shared channel (PUSCH) transmission; a receiver for receiving a first power headroom report (PHR) corresponding to a first waveform and / or a second PHR corresponding to a second waveform for an active serving cell; An apparatus comprising:

[0136] 18. The apparatus of item 17, wherein the first and second waveforms are selected from discrete Fourier transform spread orthogonal frequency division multiplexing (DFT-s-OFDM) and cyclic prefix orthogonal frequency division multiplexing (CP-OFDM).

[0137] 19. The apparatus of item 17, wherein the first PHR and the second PHR are received within one PHR media access control-control element (MAC-CE).

[0138] 20. The apparatus described in item 19, wherein the PHR at the top position in the PHR MAC-CE corresponds to the waveform of the earliest actual PUSCH transmission that overlaps in the time domain with the slot of reception of the first PHR and / or the second PHR.

[0139] 21. The apparatus according to item 19, wherein the PHR at the first position in the PHR MAC-CE corresponds to CP-OFDM, and the PHR at the subsequent position in the PHR MAC-CE corresponds to DFT-s-OFDM.

[0140] 22. The apparatus of item 17, wherein each of the first PHR and the second PHR is received in a separate PHR MAC-CE.

[0141] 23. The apparatus of item 22, wherein the PHR MAC-CE includes a field that indicates the waveform that the PHR in the PHR MAC-CE supports.

[0142] 24. The apparatus of item 17, wherein the transmitter further transmits radio resource control (RRC) signaling to configure whether one PHR or multiple PHRs for different waveforms should be reported.

[0143] In further aspects, some example items of the present disclosure relating to UE methods may be summarized as follows:

[0144] 25. Receiving, by a receiver, downlink control information (DCI) in an active serving cell indicating a first waveform or a second waveform for a physical uplink shared channel (PUSCH) transmission; determining, by a processor, a first power headroom report (PHR) corresponding to the first waveform and a second PHR corresponding to the second waveform; transmitting, by a transmitter, a first PHR and / or a second PHR for the active serving cell; A method comprising:

[0145] 26. The method of item 25, wherein when the processor determines that there are one or more actual PUSCH transmissions using the first waveform that overlap in the time domain with the slots of the transmissions of the first PHR and / or the second PHR, the first PHR is the actual PHR determined based on parameters of the earliest of the actual PUSCH transmissions.

[0146] 27. The method of item 25, wherein when the processor determines that there is no actual PUSCH transmission using the first waveform that overlaps in the time domain with the slots of the transmission of the first PHR and / or the second PHR, the first PHR is a virtual PHR determined based on a predetermined set of parameters.

[0147] 28. The method of item 25, wherein when the processor determines that there is no actual PUSCH transmission using the first waveform that overlaps in the time domain with the slots of the transmission of the first PHR and / or the second PHR, the first PHR is the actual PHR determined based on a predetermined set of parameters.

[0148] 29. The method of item 27 or 28, wherein when the processor determines that there is at least one actual PUSCH transmission of the second waveform that overlaps in the time domain with slots of transmissions of the first PHR and / or the second PHR, the predetermined set of parameters for determining the first PHR is derived from a reinterpretation of parameters indicated for the actual PUSCH transmission of the second waveform based on the first waveform.

[0149] 30. The first and second waveforms are selected from discrete Fourier transform spread orthogonal frequency division multiplexing (DFT-s-OFDM) and cyclic prefix orthogonal frequency division multiplexing (CP-OFDM), and the number of layers of the PUSCH transmission is determined by a parameter Δ for the PHR corresponding to the DFT-s-OFDM. TF,b,f,c Item 30. The method according to item 29, wherein for the calculation of

[0150] 31. The method of item 25, wherein the processor is configured to report only one PHR and selects for transmission from the first and second PHRs one PHR corresponding to the earliest actual PUSCH transmission that overlaps in the time domain with a slot of transmission of the first PHR and / or the second PHR.

[0151] 32. The method of item 25, wherein the first PHR and the second PHR are reported within one PHR media access control-control element (MAC-CE).

[0152] 33. The method according to item 32, wherein the PHR at the top position in the PHR MAC-CE corresponds to the waveform of the earliest actual PUSCH transmission that overlaps in the time domain with the slot of the transmission of the first PHR and / or the second PHR.

[0153] 34. The method according to item 32, wherein the PHR at the first position in the PHR MAC-CE corresponds to CP-OFDM, and the PHR at the subsequent position in the PHR MAC-CE corresponds to DFT-s-OFDM.

[0154] 35. The method of item 25, wherein each of the first PHR and the second PHR is reported in a separate PHR MAC-CE.

[0155] 36. The method according to item 35, wherein the PHR MAC-CE includes a field in the PHR MAC-CE that indicates the waveform that the PHR supports.

[0156] 37. The method of claim 25, wherein the receiver further receives radio resource control (RRC) signaling to configure whether one PHR or multiple PHRs for different waveforms should be reported.

[0157] 38. The method of item 25, wherein the processor further determines a path loss (PL) variation for each of the waveforms, and the transmitter transmits the first PHR and / or the second PHR when it determines that the PL variation exceeds phr-Tx-PowerFactorChange for the first waveform, for both waveforms, or for any of the waveforms.

[0158] 39. The method of item 38, wherein the PL variation for a waveform is determined based on the PL measured at the current time in the current path loss reference signal (PL-RS) for the power headroom (PH) calculation of the waveform and the PL measured at that time being used at the time of transmission of the final transmission of the PHR in the PL-RS for the PH calculation of the same waveform.

[0159] 40. The method of item 25, wherein the processor further determines a path loss (PL) variation, the PL variation being determined based on the PL currently measured in the current path loss reference signal (PL-RS) for the first PHR and the PL measured at that time that is used at the time of transmission of the final transmission of the PHR in the PL-RS for the first PHR, and the transmitter transmits the first PHR and / or the second PHR when it determines that the PL variation exceeds phr-Tx-PowerFactorChange.

[0160] In still further aspects, some example items of the present disclosure relating to gNB methods may be summarized as follows:

[0161] 41. transmitting, by a transmitter, downlink control information (DCI) in the active serving cell indicating a first waveform or a second waveform for a physical uplink shared channel (PUSCH) transmission; receiving, by a receiver, a first power headroom report (PHR) corresponding to a first waveform and / or a second PHR corresponding to a second waveform for an active serving cell; A method comprising:

[0162] 42. The method of item 41, wherein the first and second waveforms are selected from discrete Fourier transform spread orthogonal frequency division multiplexing (DFT-s-OFDM) and cyclic prefix orthogonal frequency division multiplexing (CP-OFDM).

[0163] 43. The method of item 41, wherein the first PHR and the second PHR are received within one PHR media access control-control element (MAC-CE).

[0164] 44. The method according to item 43, wherein the PHR at the top position in the PHR MAC-CE corresponds to the waveform of the earliest actual PUSCH transmission that overlaps in the time domain with the slot of reception of the first PHR and / or the second PHR.

[0165] 45. The method according to item 43, wherein the PHR at the first position in the PHR MAC-CE corresponds to CP-OFDM, and the PHR at the subsequent position in the PHR MAC-CE corresponds to DFT-s-OFDM.

[0166] 46. ​​The method of item 41, wherein each of the first PHR and the second PHR is received in a separate PHR MAC-CE.

[0167] 47. The method of item 46, wherein the PHR MAC-CE includes a field in the PHR MAC-CE that indicates the waveform that the PHR supports.

[0168] 48. The method of claim 41, wherein the transmitter further transmits radio resource control (RRC) signaling to configure whether one PHR or multiple PHRs for different waveforms should be reported.

[0169] Various embodiments and / or examples are disclosed to provide exemplary and explanatory information to enable those skilled in the art to practice the present disclosure. Features or components disclosed with respect to one embodiment or example are applicable to all embodiments or examples unless expressly stated otherwise.

[0170] The embodiments may be embodied in other specific forms. The described embodiments are to be considered in all respects only as illustrative and not restrictive. The scope is, therefore, indicated by the appended claims, rather than by the foregoing description. All changes that come within the meaning and range of equivalency of the claims are to be embraced within their scope. [Explanation of symbols]

[0171] 100 Wireless Communication System 102 User Equipment (UE) 102a UE 104 Network Equipment (NE), gNB 104a Transmission Reception Point (TRP), NE 200 UE 202 processors 204 memory 206 Input Devices 208 Display 210 Transceiver 212 Transmitter 214 Receiver 300 Network Equipment (NE), gNB 302 processor 304 memory 306 Input Devices 308 Display 310 Transceiver 312 Transmitter 314 Receiver

Claims

1. a receiver that receives downlink control information (DCI) in an active serving cell that indicates a first waveform or a second waveform for a physical uplink shared channel (PUSCH) transmission; a processor that determines a first power headroom report (PHR) corresponding to the first waveform and a second PHR corresponding to the second waveform; a transmitter for transmitting the first PHR and / or the second PHR for the active serving cell; An apparatus comprising:

2. 2. The apparatus of claim 1, wherein when the processor determines that there are one or more actual PUSCH transmissions using the first waveform that overlap in time domain with slots of transmissions of the first PHR and / or the second PHR, the first PHR is an actual PHR determined based on parameters of an earliest one of the actual PUSCH transmissions.

3. 2. The apparatus of claim 1, wherein when the processor determines that there is no actual PUSCH transmission using the first waveform that overlaps in time domain with slots of transmission of the first PHR and / or the second PHR, the first PHR is a virtual PHR determined based on a predetermined set of parameters.

4. 2. The apparatus of claim 1, wherein when the processor determines that there is no actual PUSCH transmission using the first waveform that overlaps in time domain with slots of transmission of the first PHR and / or the second PHR, the first PHR is an actual PHR determined based on a predetermined set of parameters.

5. 5. The apparatus of claim 3, wherein when the processor determines that there is at least one actual PUSCH transmission of the second waveform that overlaps in time domain with the slots of transmission of the first PHR and / or the second PHR, the predetermined set of parameters for determining the first PHR is derived from a reinterpretation of parameters indicated for the actual PUSCH transmission of the second waveform based on the first waveform.

6. The first and second waveforms are selected from discrete Fourier transform spread orthogonal frequency division multiplexing (DFT-s-OFDM) and cyclic prefix orthogonal frequency division multiplexing (CP-OFDM), and the number of layers of the PUSCH transmission is determined by a parameter Δ for a PHR corresponding to the DFT-s-OFDM. TF,b,f,c The apparatus of claim 5, wherein for the calculation of

7. 2. The apparatus of claim 1, wherein the processor is configured to report only one PHR and selects for transmission one PHR from the first and second PHRs that corresponds to an earliest actual PUSCH transmission that overlaps in time domain with a slot of transmission of the first PHR and / or the second PHR.

8. 10. The apparatus of claim 1, wherein the first PHR and the second PHR are reported in one PHR media access control-control element (MAC-CE).

9. 9. The apparatus of claim 8, wherein the PHR at the top position in the PHR MAC-CE corresponds to a waveform of an earliest actual PUSCH transmission that overlaps in time domain with a slot of transmission of the first PHR and / or the second PHR.

10. 9. The apparatus of claim 8, wherein a PHR at a first position in the PHR MAC-CE corresponds to CP-OFDM, and a PHR at a subsequent position in the PHR MAC-CE corresponds to DFT-s-OFDM.

11. 2. The apparatus of claim 1, wherein the processor further determines a path loss (PL) variation for each of the waveforms, and wherein the transmitter transmits the first PHR and / or the second PHR when it determines that the PL variation exceeds phr-Tx-PowerFactorChange for the first waveform, for both waveforms, or for any of the waveforms.

12. 12. The apparatus of claim 11, wherein the PL variation for a waveform is determined based on a currently measured PL in a current path loss reference signal (PL-RS) for a power headroom (PH) calculation of the waveform and a currently measured PL used at the time of transmission of a final transmission of a PHR in a PL-RS for a PH calculation of the same waveform.

13. 2. The apparatus of claim 1, wherein the processor further determines a path loss (PL) variation, the PL variation being determined based on a PL currently measured in a current path loss reference signal (PL-RS) for the first PHR and a PL measured at that time that is used at the time of transmission of a final transmission of the PHR in the PL-RS for the first PHR, and the transmitter transmits the first PHR and / or the second PHR when it determines that the PL variation exceeds phr-Tx-PowerFactorChange.

14. a transmitter that transmits downlink control information (DCI) in an active serving cell, the DCI indicating a first waveform or a second waveform for a physical uplink shared channel (PUSCH) transmission; a receiver for receiving a first power headroom report (PHR) corresponding to the first waveform and / or a second PHR corresponding to the second waveform for the active serving cell; An apparatus comprising:

15. receiving, by a receiver, downlink control information (DCI) in an active serving cell indicating a first waveform or a second waveform for a physical uplink shared channel (PUSCH) transmission; determining, by a processor, a first power headroom report (PHR) corresponding to the first waveform and a second PHR corresponding to the second waveform; transmitting, by a transmitter, the first PHR and / or the second PHR for the active serving cell; A method comprising:

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