WO2024079123A1 - Wireless device changing power class at instant of reporting power headroom - Google Patents

Wireless device changing power class at instant of reporting power headroom Download PDF

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Publication number
WO2024079123A1
WO2024079123A1 PCT/EP2023/078056 EP2023078056W WO2024079123A1 WO 2024079123 A1 WO2024079123 A1 WO 2024079123A1 EP 2023078056 W EP2023078056 W EP 2023078056W WO 2024079123 A1 WO2024079123 A1 WO 2024079123A1
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WO
WIPO (PCT)
Prior art keywords
power
phr
transmission
serving cell
power class
Prior art date
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PCT/EP2023/078056
Other languages
French (fr)
Inventor
Maomao CHEN LARSSON
Christian Bergljung
Robert Mark Harrison
Peter Alriksson
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Telefonaktiebolaget Lm Ericsson (Publ)
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Publication of WO2024079123A1 publication Critical patent/WO2024079123A1/en

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
    • H04W52/04—TPC
    • H04W52/06—TPC algorithms
    • H04W52/14—Separate analysis of uplink or downlink
    • H04W52/146—Uplink power control
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/0001—Arrangements for dividing the transmission path
    • H04L5/0003—Two-dimensional division
    • H04L5/0005—Time-frequency
    • H04L5/0007—Time-frequency the frequencies being orthogonal, e.g. OFDM(A), DMT
    • H04L5/001—Time-frequency the frequencies being orthogonal, e.g. OFDM(A), DMT the frequencies being arranged in component carriers
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
    • H04W52/04—TPC
    • H04W52/30—TPC using constraints in the total amount of available transmission power
    • H04W52/36—TPC using constraints in the total amount of available transmission power with a discrete range or set of values, e.g. step size, ramping or offsets
    • H04W52/365—Power headroom reporting
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0048—Allocation of pilot signals, i.e. of signals known to the receiver
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/0091—Signaling for the administration of the divided path
    • H04L5/0092—Indication of how the channel is divided
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
    • H04W52/04—TPC
    • H04W52/18—TPC being performed according to specific parameters
    • H04W52/24—TPC being performed according to specific parameters using SIR [Signal to Interference Ratio] or other wireless path parameters
    • H04W52/242—TPC being performed according to specific parameters using SIR [Signal to Interference Ratio] or other wireless path parameters taking into account path loss
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
    • H04W52/04—TPC
    • H04W52/30—TPC using constraints in the total amount of available transmission power
    • H04W52/34—TPC management, i.e. sharing limited amount of power among users or channels or data types, e.g. cell loading
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
    • H04W52/04—TPC
    • H04W52/30—TPC using constraints in the total amount of available transmission power
    • H04W52/36—TPC using constraints in the total amount of available transmission power with a discrete range or set of values, e.g. step size, ramping or offsets
    • H04W52/367—Power values between minimum and maximum limits, e.g. dynamic range
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
    • H04W52/04—TPC
    • H04W52/38—TPC being performed in particular situations
    • H04W52/40—TPC being performed in particular situations during macro-diversity or soft handoff
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W76/00—Connection management
    • H04W76/10—Connection setup
    • H04W76/15—Setup of multiple wireless link connections
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W76/00—Connection management
    • H04W76/20—Manipulation of established connections
    • H04W76/27—Transitions between radio resource control [RRC] states

Definitions

  • the present disclosure relates to wireless communications, and in particular, to changing of a power class at a wireless device.
  • 3GPP Third Generation Partnership Project
  • 4G also referred to as Long Term Evolution (LTE)
  • 5G also referred to as New Radio (NR)
  • 4G fourth Generation
  • 5G Fifth Generation
  • Such systems provide, among other features, broadband communication between network nodes, such as base stations, and mobile wireless devices (WD), as well as communication between network nodes and between WDs.
  • 6G wireless communication systems are also under development.
  • Network node may refer to a central node while wireless device may refer to a device connected to the network node.
  • the power reporting is referred to as a power-headroom report that is governed by the power capability and uplink power control.
  • Power control and power capability Power capability determines the maximum wireless device uplink power per cell or for carrier aggregation (CA).
  • CA carrier aggregation
  • the uplink power remaining given a transmission allocation by the network node is also reported to the network node (by power headroom reporting).
  • the wireless device output power for uplink transmissions is controlled independently for each cell c and carrier frequency f.
  • the power control for uplink transmissions in a transmission occasion i typically involve both open- and closed-loop control
  • ⁇ ⁇ is the target received power at the receiver (the network node for NR), ⁇ ⁇ , ⁇ the path-loss estimate with a weight factor ⁇ ⁇ , ⁇ (the sum ⁇ ⁇ + ⁇ ⁇ , ⁇ ⁇ ⁇ , ⁇ the transmission resources required output power per resource for open-loop control), ⁇ ⁇ , ⁇ the allocated resource bandwidth, ⁇ ⁇ , ⁇ including factors such as the uplink modulation format and ⁇ ⁇ , ⁇ a relative power change for closed-loop control.
  • the output power determined by open- and closed loop power is limited by the maximum output power ⁇ ⁇ , ⁇ , ⁇ ( ⁇ ) configured (computed) by the wireless device for cell c and carrier frequency f.
  • the configured ⁇ ⁇ , ⁇ , ⁇ ( ⁇ ) applies for all types of transmissions (physical uplink control channel (PUCCH), physical uplink shared channel (PUSCH) and sounding reference signal (SRS)) and is in turn capped by the power capability ⁇ ⁇ ⁇ .
  • the ⁇ ⁇ , ⁇ , ⁇ ( ⁇ ) configured may essentially be described by ⁇ ⁇ , ⁇ , ⁇ ( ⁇ ) ⁇ ⁇ ⁇ ⁇ , ⁇ ⁇ ⁇ , ⁇ , ⁇ ⁇ ⁇ and hence limited by ⁇ the power capability ⁇ ⁇ ⁇ of the wireless device, indicated to the network by wireless device capability signaling ⁇ a function ⁇ ⁇ ⁇ , ⁇ ⁇ ⁇ ⁇ ⁇ of the power capability and maximum power reductions MPR allowed for compliance with, e.g., unwanted emissions requirements ⁇ a cell-specific or wireless device-specific limitation ⁇ ⁇ (absolute) indicated to the wireless device by the network node in the system information broadcasted in the cell or by dedicated signaling to the wireless device.
  • the wireless device is allowed a power-back-off up to MPR (dB) but does not necessarily use the full allowance.
  • the ⁇ ⁇ , ⁇ , ⁇ ( ⁇ ) is therefore specified in a range, from 3GPP standards such as, for example, 3GPP Technical Standard (TS) 38.101-1 v17.6.02022-06 for a single serving cell in FR1,
  • the configured maximum output power is set within the following bounds: P CMAX_L,f,c ⁇ P CMAX,f,c ⁇ P CMAX_H,f,c with where the lower bound is governed by the maximum allowed back-off MPR while both the upper and lower bounds are limited by the power class (power capability) ⁇ ⁇ ⁇ and a cell-specific limit class ⁇ ⁇ (the ⁇ ⁇ , ⁇ ).
  • ⁇ ⁇ filter attenuation
  • the power class may be modified by ⁇ ⁇ in case the maximum power capability must be reduced for e.g. exposure compliance (SAR).
  • SAR exposure compliance
  • Power class/capability may be modified for compliance with maximum exposure (MPE) measured as a Specific Absorption Ratio (SAR) below 10 GHz and MPE (usually) measured as a power-flux density for higher frequencies.
  • MPE maximum exposure
  • SAR Specific Absorption Ratio
  • the power class in the power-control equations may be modified by ⁇ ⁇ ⁇ under specific conditions e.g. when the uplink transmission duty cycle exceeds a threshold in time division duplex (TDD) bands (UL/downlink (DL) configuration). The conditions are specified but not the event in time at which the ⁇ ⁇ ⁇ is applied.
  • the other allowance is a proprietary power back-off denoted P- MPR (‘P’ for power management) the limits of which is not specified. This back-off is often used in case proximity sensors detect the presence of a user/wireless device and may be applied at any instance in time.
  • CA carrier aggregation
  • FR1 Frequency Range 1
  • Inter-band UL CA is essentially the sum of the configured power per cell and capped by the power class ⁇ ⁇ ⁇ , ⁇ of the CA band combination as described in 3GPP standards such as in, for example, 3GPP TS 38.101-1 v17.6.02022-06:
  • the total configured maximum output power P CMAX is set within the following bounds: PCMAX_L ⁇ PCMAX ⁇ PCMAX_H
  • P CMAX_L MIN ⁇ 10log 10 ⁇ MIN [ p EMAX,c / ( ⁇ t C,c ), p PowerClass.c /(MAX(mpr c ⁇ mpr c , a-mpr c ) ⁇ ⁇ t C,c ⁇ ⁇ t IB,c ⁇ ⁇ t RxSRS,c ) , p PowerClass,c /pmpr c ], P
  • Prioritizations for transmission power reductions For single cell operation with two uplink carriers or for operation with carrier aggregation, if a total wireless device transmit power for PUSCH or PUCCH or physical random access channel (PRACH) or SRS transmissions on serving cells in a frequency a respective transmission occasion i ⁇ range in would exceed , is the linear value of P CMAX( i ) in transmission occasion i as defined in 3GPP standards such as in, for example, 3GPP Technical Specification (TS) 38.101-1 for FR1 and 3GPP TS38.101-2 for FR2, the wireless device 22 allocates power to PUSCH/PUCCH/PRACH/SRS transmissions according to the following priority order (in descending order) so that the total wireless device transmit power for transmissions on serving cells in the frequency range is smaller than or equal to for that frequency range in every symbol of transmission occasion i .
  • 3GPP Technical Specification TS 38.101-1 for FR1
  • 3GPP TS38.101-2 for FR2
  • the wireless device When determining a total transmit power for serving cells in a frequency range in a symbol of transmission occasion i , the wireless device does not include power for transmissions starting after the symbol of transmission occasion i .
  • the total wireless device transmit power in a symbol of a slot is defined as the sum of the linear values of wireless device transmit powers for PUSCH, PUCCH, PRACH, and SRS in the symbol of the slot.
  • the wireless device prioritizes power allocation for transmissions on the primary cell of the MCG or the SCG over transmissions on a secondary cell. In case of same priority order and for operation with two UL carriers, the wireless device prioritizes power allocation for transmissions on the carrier where the wireless device is configured to transmit PUCCH. If PUCCH is not configured for any of the two UL carriers, the wireless device prioritizes power allocation for transmissions on the non-supplementary UL carrier. Given a total power ⁇ ⁇ , the wireless device allocates power for transmission types in a priority order when power limited.
  • the power class of the CA configuration may also be modified to account for MPE requirements by ⁇ ⁇ ⁇ , ⁇ for concurrent uplink transmissions on more several uplink serving cells. This means that the wireless device would start prioritizing the uplink power at ⁇ ⁇ ⁇ , ⁇ lower output power (dB scale). The conditions at which this is allowed is specified for selected cases and may depend on the uplink duty cycles on the serving cells.
  • the power class for band combination (CA or dual-connectivity) may be different from the power-class for the constituent bands.
  • Power headroom reporting The power capability determines the power headroom (PH) reported in the power- headroom report (PH) the ratio/difference (linear/dB) between the configured maximum output power (depending on the power class) and the estimated output power required for the uplink transmission scheduled by the network node.
  • PH power headroom
  • linear/dB ratio/difference
  • a positive value (in dB) means that there is remaining power available while a negative PH means that the uplink power is capped by the maximum power and that there is a power deficiency for the uplink allocation.
  • the maximum output power is also reported in the PHR.
  • the PH is changed for a given scheduled uplink transmission.
  • the PH may be based on an actual transmission with a scheduled uplink resource ( ⁇ ⁇ , ⁇ ( ⁇ ) in the expression above) or a reference format without a scheduled resource and an assumption that all power back-off are set to zero (including P-MPR).
  • the wireless device determines the PHR as described in 3GPP standards such as in, for example, 3GPP TS 38.213 v17.3.02022-09, as follows: determines whether PH value for an activated Serving Cell is based on real transmission or a reference format by considering the configured grant(s) or periodic/semi-persistent SRS transmissions and downlink control information which has been received until and including the physical downlink control channel (PDCCH) occasion in which the first UL grant for a new transmission is received since a PHR has been triggered if the PHR medium access control (MAC) control element (CE) is reported on an uplink grant received on the PDCCH or until the first uplink symbol of PUSCH transmission minus PUSCH preparation time as defined in subclause 3GPP TS 38.214 if the PHR MAC CE is reported on a configured grant.
  • 3GPP standards such as in, for example, 3GPP TS 38.213 v17.3.02022-09, as follows: determines whether
  • the ⁇ ⁇ affects the PHR for both an actual transmission and the reference format for both PUSCH and SRS.
  • the application of ⁇ ⁇ to uplink transmissions in time is up to wireless device implementation.
  • PHR is defined as below.
  • Power Headroom Reporting The Power Headroom reporting procedure is used to provide the serving network node with the following information: - Type 1 power headroom: the difference between the nominal wireless device maximum transmit power and the estimated power for UL-shared channel (SCH) transmission per activated Serving Cell; - Type 2 power headroom: the difference between the nominal wireless device maximum transmit power and the estimated power for UL-SCH and PUCCH transmission on SpCell of the other MAC entity (i.e., E-UTRA MAC entity in EN-DC, NE-DC, and NGEN-DC cases); - Type 3 power headroom: the difference between the nominal wireless device maximum transmit power and the estimated power for SRS transmission per activated Serving Cell; - MPE P-MPR: the power backoff to meet the MPE FR2 requirements for a Serving Cell operating on FR2.
  • SCH UL-shared channel
  • RRC controls Power Headroom reporting by configuring the following parameters: - phr-PeriodicTimer; - phr-ProhibitTimer; - phr-Tx-PowerFactorChange; - phr-Type2OtherCell; - phr-ModeOtherCG; - multiplePHR; - mpe-Reporting-FR2; - mpe-ProhibitTimer; - mpe-Threshold; - numberOfN; - mpe-ResourcePool; - twoPHRMode.
  • a Power Headroom Report may be triggered if any of the following PH reporting events occur (thus the following are examples of PH report events): - phr-ProhibitTimer expires or has expired and the path loss has changed more than phr-Tx-PowerFactorChange dB for at least one RS used as pathloss reference for one activated Serving Cell of any MAC entity of which the active DL bandwidth part (BWP) is not dormant BWP since the last transmission of a PHR in this MAC entity when the MAC entity has UL resources for new transmission;
  • BWP active DL bandwidth part
  • the path loss variation for one cell assessed above is between the pathloss measured at present time on the current pathloss reference and the pathloss measured at the transmission time of the last transmission of PHR on the pathloss reference in use at that time, irrespective of whether the pathloss reference has changed in between.
  • the current pathloss reference for this purpose does not include any pathloss reference configured using pathlossReferenceRS-Pos in 3GPP TS 38.331.
  • - phr-PeriodicTimer expires; - upon configuration or reconfiguration of the power headroom reporting functionality by upper layers, which is not used to disable the function; - activation of an SCell of any MAC entity with configured uplink of which firstActiveDownlinkBWP-Id is not set to dormant BWP; - activation of an SCG; - addition of the PSCell except if the secondary cell group (SCG) is deactivated (i.e., PSCell is newly added or changed); - phr-ProhibitTimer expires or has expired, when the MAC entity has UL resources for new transmission, and the following is true for any of the activated Serving Cells of any MAC entity with configured uplink: - there are UL resources allocated for transmission or there is a PUCCH transmission on this cell,
  • the MAC entity may avoid triggering a PHR when the required power backoff due to power management decreases only temporarily (e.g., for up to a few tens of milliseconds) and it may avoid reflecting such temporary decrease in the values of PCMAX,f,c/PH when a PHR is triggered by other triggering conditions.
  • NOTE 3 If a HARQ process is configured with cg-RetransmissionTimer and if the PHR is already included in a MAC PDU for transmission on configured grant by this HARQ process, but not yet transmitted by lower layers, it is up to wireless device implementation how to handle the PHR content.
  • PHR-Config :: SEQUENCE ⁇ phr-PeriodicTimer ENUMERATED ⁇ sf10, sf20, sf50, sf100, sf200,sf500, sf1000, infinity ⁇ , phr-ProhibitTimer ENUMERATED ⁇ sf0, sf10, sf20, sf50, sf100,sf200, sf500, sf1000 ⁇ , phr-Tx-PowerFactorChange ENUMERATED ⁇ dB1, dB3, dB6, infinity ⁇ , multiplePHR BOOLEAN, dummy BOOLEAN, phr-Type2OtherCell BOOLEAN, phr-ModeOtherCG ENUMERATED ⁇ real, virtual ⁇ , ..., [[ mpe-Reporting-FR2-r16 Set
  • PHR is reported for PUSCH (Type 1) and SRS (Type 3).
  • PH may be either single- entry (for a serving cell) or multi-entry including serving cells of a MR-DC or UL CA band combination. The latter is configured for the said band combinations, otherwise single-entry.
  • the PHR may be either periodic (typically 20-50 ms) or triggered with phr- PeriodicTimer by events such as DL path loss changes affecting the UL power required or a P-MPR change if this is above a configurable threshold value.
  • a PHR is triggered if any of the following events occur: - phr-ProhibitTimer expires or has expired and the path loss has changed more than phr-Tx-PowerFactorChange dB [configurable threshold] for at least one RS used as pathloss reference for one activated Serving Cell of any MAC entity of which the active DL BWP is not dormant BWP since the last transmission of a PHR in this MAC entity when the MAC entity has UL resources for new transmission; Relating to SAR and MPE compliance, a PHR is also triggered if the P-MPR is changed more than a configurable threshold with phr-Tx-PowerFactorChange for more than a few tenths of milliseconds (SAR a long-term average) when the wireless device has UL resources for new transmission: - there are UL resources allocated for transmission or there is a PUCCH transmission on this cell, and the required power back
  • the power capability change ⁇ ⁇ is not coordinated with the power (headroom) reporting event, which leads to a misalignment between the power reported to (and assumed by) a network node and the actual power available from the wireless device.
  • the power usage is not optimized for both the wireless device and the network node, from a system point of view.
  • existing systems suffer from various inefficiencies that may negatively affect system optimization.
  • the power capability modification (the change ⁇ ⁇ ) to and from a first power capability to a second power capability amongst a plurality of power capabilities is conditioned on (aligned with) reporting events of available power and capability (PHR).
  • the power capability modification is equivalent as power class change.
  • the power class change includes changing from a higher power class to a lower power class and changing from a lower power class to a higher power class, for at least one serving cells or a CA band combination with at least one serving cells.
  • Changes of (indicated) power capability of a wireless device e.g., user equipment
  • Changes of (indicated) power capability of a wireless device from a first value to a second value and back are made at power capability reporting events, all transmissions preceding this event are according to the first capability, transmissions succeeding the event are according to the second capability.
  • a wireless device configured to communicate with a network node.
  • the wireless device is configured to transmit a power headroom report, PHR, to the network node in response to a power headroom, PH, reporting event.
  • the WD is also configured to perform a power class change from a first power class value to a second power class value at a time instant associated with the PH reporting event.
  • the WD is configured to apply the power class change to uplink transmissions subsequent to the time instant associated with the PH reporting event.
  • the time instant occurs within a preconfigured interval of time preceding or following the PH reporting event.
  • the preconfigured interval of time is within at most two time slots of the PH reporting event. In some embodiments, the time instant occurs at a time of the PH reporting event.
  • each of the first and second power class value corresponds to an activated serving cell. In some embodiments, each of the first and second power class value corresponds to at least one activated serving cell in a configured band combination for carrier aggregation or dual connectivity.
  • the PHR is configured for an activated serving cell. In some embodiments, the PHR is configured for at least one activated serving cell in a configured band combination for carrier aggregation or dual connectivity.
  • the power class change is associated with at least one of: specific absorption ratio, SAR, limits, maximum permissible exposure, MPE, limits, internal heat limitations, transmission duty cycle and radio resource control, RRC, reconfiguration of a band combination for carrier aggregation or dual connectivity.
  • the WD is configured to apply the power class change for a serving cell of a configured operating band before a radio resource control, RRC, reconfiguration.
  • the WD is configured to apply the power class change for at least one serving cell of a configured operating band combination for carrier aggregation or dual connectivity after a radio resource control, RRC, reconfiguration.
  • the PH reporting event is at least one of expiry of a prohibit timer and a change in path loss that exceeds a threshold for at least one path loss reference signal for an activated serving cell of a medium access control, MAC, entity of which a downlink bandwidth part, BWP, is dormant since a last transmission of a PHR in the MAC entity when the MAC entity has uplink, UL, resources for a new transmission; expiry of a periodic timer; configuration of a PH reporting functionality by upper layers; activation of the MAC entity with a configured uplink of which a BWP parameter is not set to a dormant BWP; activation of a secondary cell group, SCG; addition of a primary special cell, PSCell, unless the SCG is deactivated; expiry of a prohibit time when the MAC entity has UL resources for a new transmission and the following is true for an activated serving cell of any MAC entity with a configured uplink: UL resources are allocated for transmission or
  • a method in a wireless device, WD, configured to communicate with a network node includes transmitting a power headroom report, PHR, to the network node in response to a power headroom, PH, reporting event; and performing a power class change from a first power class value to a second power class value at a time instant associated with the PH reporting event.
  • the method includes applying the power class change to uplink transmissions subsequent to the time instant associated with the PH reporting event.
  • the time instant occurs within a preconfigured interval of time preceding or following the PH reporting event.
  • the preconfigured interval of time within is at most two time slots of the PH reporting event.
  • the time instant occurs at a time of the PH reporting event.
  • each of the first and second power class value corresponds to an activated serving cell. within at most two time slots of the PH reporting event each of the first and second power class value corresponds to at least one activated serving cell in a configured band combination for carrier aggregation or dual connectivity.
  • the PHR is configured for an activated serving cell. In some embodiments, the PHR is configured for at least one activated serving cell in a configured band combination for carrier aggregation or dual connectivity.
  • the power class change is associated with at least one of: specific absorption ratio, SAR, limits, maximum permissible exposure, MPE, limits, internal heat limitations, transmission duty cycle and radio resource control, RRC, reconfiguration of a band combination for carrier aggregation or dual connectivity.
  • the method includes applying the power class change for a serving cell of a configured operating band before a radio resource control, RRC, reconfiguration.
  • the method includes applying the power class change for at least one serving cell of a configured operating band combination for carrier aggregation or dual connectivity after a radio resource control, RRC, reconfiguration.
  • the PH reporting event is at least one of: expiry of a prohibit timer and a change in path loss that exceeds a threshold for at least one path loss reference signal for an activated serving cell of a medium access control, MAC, entity of which a downlink bandwidth part, BWP, is dormant since a last transmission of a PHR in the MAC entity when the MAC entity has uplink, UL, resources for a new transmission; expiry of a periodic timer; configuration of a PH reporting functionality by upper layers; activation of the MAC entity with a configured uplink of which a BWP parameter is not set to a dormant BWP; activation of a secondary cell group, SCG; addition of a primary special cell, PSCell, unless the SCG is deactivated; expiry of a prohibit time when the MAC entity has UL resources for a new transmission and the following is true for an activated serving cell of any MAC entity with a configured uplink: UL resources are allocated for transmission
  • FIG.1 is a schematic diagram of an example network architecture illustrating a communication system connected via an intermediate network to a host computer according to the principles in the present disclosure
  • FIG.2 is a block diagram of a host computer communicating via a network node with a wireless device over an at least partially wireless connection according to some embodiments of the present disclosure
  • FIG.3 is a flowchart illustrating example methods implemented in a communication system including a host computer, a network node and a wireless device for executing a client application at a wireless device according to some embodiments of the present disclosure
  • FIG.4 is a flowchart illustrating example methods implemented in a communication system including a host computer, a network node and a wireless device for receiving user data at a wireless device according to some embodiments of the present disclosure
  • FIG.5 is a flowchart
  • the joining term, “in communication with” and the like may be used to indicate electrical or data communication, which may be accomplished by physical contact, induction, electromagnetic radiation, radio signaling, infrared signaling or optical signaling, for example.
  • electrical or data communication may be accomplished by physical contact, induction, electromagnetic radiation, radio signaling, infrared signaling or optical signaling, for example.
  • the term “coupled,” “connected,” and the like may be used herein to indicate a connection, although not necessarily directly, and may include wired and/or wireless connections.
  • the phrase "time instant” is used although the phrase "time instance" may be equally applicable.
  • network node may be any kind of network node comprised in a radio network which may further comprise any of base station (BS), radio base station, base transceiver station (BTS), base station controller (BSC), radio network controller (RNC), g Node B (gNB), evolved Node B (eNB or eNodeB), Node B, multi- standard radio (MSR) radio node such as MSR BS, multi-cell/multicast coordination entity (MCE), integrated access and backhaul (IAB) node, relay node, donor node controlling relay, radio access point (AP), transmission points, transmission nodes, Remote Radio Unit (RRU) Remote Radio Head (RRH), a core network node (e.g., mobile management entity (MME), self-organizing network (SON) node, a coordinating node, positioning node, MDT node, etc.), an external node (e.g., 3rd party node, a node external to the current network), nodes in distributed antenna system (
  • BS base station
  • the network node may also comprise test equipment.
  • radio node used herein may be used to also denote a wireless device (WD) such as a wireless device (WD) or a radio network node.
  • WD wireless device
  • UE user equipment
  • the WD herein may be any type of wireless device capable of communicating with a network node or another WD over radio signals, such as wireless device (WD).
  • the WD may also be a radio communication device, target device, device to device (D2D) WD, machine type WD or WD capable of machine to machine communication (M2M), low-cost and/or low-complexity WD, a sensor equipped with WD, Tablet, mobile terminals, smart phone, laptop embedded equipped (LEE), laptop mounted equipment (LME), USB dongles, Customer Premises Equipment (CPE), an Internet of Things (IoT) device, or a Narrowband IoT (NB-IOT) device, etc.
  • the generic term “radio network node” is used.
  • Radio network node may comprise any of base station, radio base station, base transceiver station, base station controller, network controller, RNC, evolved Node B (eNB), Node B, gNB, Multi-cell/multicast Coordination Entity (MCE), IAB node, relay node, access point, radio access point, Remote Radio Unit (RRU) Remote Radio Head (RRH).
  • RNC evolved Node B
  • MCE Multi-cell/multicast Coordination Entity
  • IAB node Multi-cell/multicast Coordination Entity
  • RRU Remote Radio Unit
  • RRH Remote Radio Head
  • WCDMA Wide Band Code Division Multiple Access
  • WiMax Worldwide Interoperability for Microwave Access
  • UMB Ultra Mobile Broadband
  • GSM Global System for Mobile Communications
  • the general description elements in the form of “one of A and B” corresponds to A or B.
  • at least one of A and B corresponds to A, B or AB, or to one or more of A and B.
  • at least one of A, B and C corresponds to one or more of A, B and C, and/or A, B, C or a combination thereof.
  • functions described herein as being performed by a wireless device or a network node may be distributed over a plurality of wireless devices and/or network nodes.
  • the functions of the network node and wireless device described herein are not limited to performance by a single physical device and, in fact, may be distributed among several physical devices.
  • all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this disclosure belongs. It will be further understood that terms used herein should be interpreted as having a meaning that is consistent with their meaning in the context of this specification and the relevant art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.
  • FIG.1 a schematic diagram of a communication system 10, according to an embodiment, such as a 3GPP-type cellular network that may support standards such as LTE and/or NR (5G), which comprises an access network 12, such as a radio access network, and a core network 14.
  • the access network 12 comprises a plurality of network nodes 16a, 16b, 16c (referred to collectively as network nodes 16), such as NBs, eNBs, gNBs or other types of wireless access points, each defining a corresponding coverage area 18a, 18b, 18c (referred to collectively as coverage areas 18).
  • Each network node 16a, 16b, 16c is connectable to the core network 14 over a wired or wireless connection 20.
  • a first wireless device (WD) 22a located in coverage area 18a is configured to wirelessly connect to, or be paged by, the corresponding network node 16a.
  • a second WD 22b in coverage area 18b is wirelessly connectable to the corresponding network node 16b. While a plurality of WDs 22a, 22b (collectively referred to as wireless devices 22) are illustrated in this example, the disclosed embodiments are equally applicable to a situation where a sole WD is in the coverage area or where a sole WD is connecting to the corresponding network node 16.
  • a WD 22 may be in simultaneous communication and/or configured to separately communicate with more than one network node 16 and more than one type of network node 16.
  • a WD 22 may have dual connectivity with a network node 16 that supports LTE and the same or a different network node 16 that supports NR.
  • WD 22 may be in communication with an eNB for LTE/E-UTRAN and a gNB for NR/NG-RAN.
  • the communication system 10 may itself be connected to a host computer 24, which may be embodied in the hardware and/or software of a standalone server, a cloud- implemented server, a distributed server or as processing resources in a server farm.
  • the host computer 24 may be under the ownership or control of a service provider, or may be operated by the service provider or on behalf of the service provider.
  • the connections 26, 28 between the communication system 10 and the host computer 24 may extend directly from the core network 14 to the host computer 24 or may extend via an optional intermediate network 30.
  • the intermediate network 30 may be one of, or a combination of more than one of, a public, private or hosted network.
  • the intermediate network 30, if any, may be a backbone network or the Internet.
  • the intermediate network 30 may comprise two or more sub-networks (not shown).
  • the communication system of FIG.1 as a whole enables connectivity between one of the connected WDs 22a, 22b and the host computer 24.
  • the connectivity may be described as an over-the-top (OTT) connection.
  • the host computer 24 and the connected WDs 22a, 22b are configured to communicate data and/or signaling via the OTT connection, using the access network 12, the core network 14, any intermediate network 30 and possible further infrastructure (not shown) as intermediaries.
  • the OTT connection may be transparent in the sense that at least some of the participating communication devices through which the OTT connection passes are unaware of routing of uplink and downlink communications.
  • a network node 16 may not or need not be informed about the past routing of an incoming downlink communication with data originating from a host computer 24 to be forwarded (e.g., handed over) to a connected WD 22a. Similarly, the network node 16 need not be aware of the future routing of an outgoing uplink communication originating from the WD 22a towards the host computer 24.
  • a network node 16 is configured to include an indication unit 32 which is configured to perform one or more network node 16 functions as described herein such as with respect to changing of a power class at a wireless device 22.
  • a wireless device 22 is configured to include a power headroom report (PHR) unit 34 which is configured to perform one or more wireless device 22 functions as described herein such as with respect to changing of a power class at a wireless device 22.
  • the PHR unit 34 may be configured to perform a power class change from a first power class value to a second power class value at a time instant associated with the PH reporting event.
  • the power class change may be applied to uplink transmission.
  • a host computer 24 comprises hardware (HW) 38 including a communication interface 40 configured to set up and maintain a wired or wireless connection with an interface of a different communication device of the communication system 10.
  • the host computer 24 further comprises processing circuitry 42, which may have storage and/or processing capabilities.
  • the processing circuitry 42 may include a processor 44 and memory 46.
  • the processing circuitry 42 may comprise integrated circuitry for processing and/or control, e.g., one or more processors and/or processor cores and/or FPGAs (Field Programmable Gate Array) and/or ASICs (Application Specific Integrated Circuitry) adapted to execute instructions.
  • the processor 44 may be configured to access (e.g., write to and/or read from) memory 46, which may comprise any kind of volatile and/or nonvolatile memory, e.g., cache and/or buffer memory and/or RAM (Random Access Memory) and/or ROM (Read-Only Memory) and/or optical memory and/or EPROM (Erasable Programmable Read-Only Memory).
  • memory 46 may comprise any kind of volatile and/or nonvolatile memory, e.g., cache and/or buffer memory and/or RAM (Random Access Memory) and/or ROM (Read-Only Memory) and/or optical memory and/or EPROM (Erasable Programmable Read-Only Memory).
  • Processing circuitry 42 may be configured to control any of the methods and/or processes described herein and/or to cause such methods, and/or processes to be performed, e.g., by host computer 24.
  • Processor 44 corresponds to one or more processors 44 for performing host computer 24 functions described herein.
  • the host computer 24 includes memory 46 that is configured to store data, programmatic software code and/or other information described herein.
  • the software 48 and/or the host application 50 may include instructions that, when executed by the processor 44 and/or processing circuitry 42, causes the processor 44 and/or processing circuitry 42 to perform the processes described herein with respect to host computer 24.
  • the instructions may be software associated with the host computer 24.
  • the software 48 may be executable by the processing circuitry 42.
  • the software 48 includes a host application 50.
  • the host application 50 may be operable to provide a service to a remote user, such as a WD 22 connecting via an OTT connection 52 terminating at the WD 22 and the host computer 24.
  • the host application 50 may provide user data which is transmitted using the OTT connection 52.
  • the “user data” may be data and information described herein as implementing the described functionality.
  • the host computer 24 may be configured for providing control and functionality to a service provider and may be operated by the service provider or on behalf of the service provider.
  • the processing circuitry 42 of the host computer 24 may enable the host computer 24 to observe, monitor, control, transmit to and/or receive from the network node 16 and or the wireless device 22.
  • the processing circuitry 42 of the host computer 24 may include an information unit 54 configured to enable the service provider to store, analyze, forward, relay, transmit, receiving, determine, etc. information related to changing of a power class at a wireless device 22.
  • the communication system 10 further includes a network node 16 provided in a communication system 10 and including hardware 58 enabling it to communicate with the host computer 24 and with the WD 22.
  • the hardware 58 may include a communication interface 60 for setting up and maintaining a wired or wireless connection with an interface of a different communication device of the communication system 10, as well as a radio interface 62 for setting up and maintaining at least a wireless connection 64 with a WD 22 located in a coverage area 18 served by the network node 16.
  • the radio interface 62 may be formed as or may include, for example, one or more RF transmitters, one or more RF receivers, and/or one or more RF transceivers.
  • the communication interface 60 may be configured to facilitate a connection 66 to the host computer 24.
  • the connection 66 may be direct or it may pass through a core network 14 of the communication system 10 and/or through one or more intermediate networks 30 outside the communication system 10.
  • the hardware 58 of the network node 16 further includes processing circuitry 68.
  • the processing circuitry 68 may include a processor 70 and a memory 72.
  • the processing circuitry 68 may comprise integrated circuitry for processing and/or control, e.g., one or more processors and/or processor cores and/or FPGAs (Field Programmable Gate Array) and/or ASICs (Application Specific Integrated Circuitry) adapted to execute instructions.
  • the processor 70 may be configured to access (e.g., write to and/or read from) the memory 72, which may comprise any kind of volatile and/or nonvolatile memory, e.g., cache and/or buffer memory and/or RAM (Random Access Memory) and/or ROM (Read-Only Memory) and/or optical memory and/or EPROM (Erasable Programmable Read-Only Memory).
  • the network node 16 further has software 74 stored internally in, for example, memory 72, or stored in external memory (e.g., database, storage array, network storage device, etc.) accessible by the network node 16 via an external connection.
  • the software 74 may be executable by the processing circuitry 68.
  • the processing circuitry 68 may be configured to control any of the methods and/or processes described herein and/or to cause such methods, and/or processes to be performed, e.g., by network node 16.
  • Processor 70 corresponds to one or more processors 70 for performing network node 16 functions described herein.
  • the memory 72 is configured to store data, programmatic software code and/or other information described herein.
  • the software 74 may include instructions that, when executed by the processor 70 and/or processing circuitry 68, causes the processor 70 and/or processing circuitry 68 to perform the processes described herein with respect to network node 16.
  • processing circuitry 68 of the network node 16 may include an indication unit 32 configured to perform one or more network node 16 functions as described herein such as with respect to changing of a power class at a wireless device.
  • the communication system 10 further includes the WD 22 already referred to.
  • the WD 22 may have hardware 80 that may include a radio interface 82 configured to set up and maintain a wireless connection 64 with a network node 16 serving a coverage area 18 in which the WD 22 is currently located.
  • the radio interface 82 may be formed as or may include, for example, one or more RF transmitters, one or more RF receivers, and/or one or more RF transceivers.
  • the hardware 80 of the WD 22 further includes processing circuitry 84.
  • the processing circuitry 84 may include a processor 86 and memory 88.
  • the processing circuitry 84 may comprise integrated circuitry for processing and/or control, e.g., one or more processors and/or processor cores and/or FPGAs (Field Programmable Gate Array) and/or ASICs (Application Specific Integrated Circuitry) adapted to execute instructions.
  • processors and/or processor cores and/or FPGAs Field Programmable Gate Array
  • ASICs Application Specific Integrated Circuitry
  • the processor 86 may be configured to access (e.g., write to and/or read from) memory 88, which may comprise any kind of volatile and/or nonvolatile memory, e.g., cache and/or buffer memory and/or RAM (Random Access Memory) and/or ROM (Read-Only Memory) and/or optical memory and/or EPROM (Erasable Programmable Read-Only Memory).
  • memory 88 may comprise any kind of volatile and/or nonvolatile memory, e.g., cache and/or buffer memory and/or RAM (Random Access Memory) and/or ROM (Read-Only Memory) and/or optical memory and/or EPROM (Erasable Programmable Read-Only Memory).
  • the WD 22 may further comprise software 90, which is stored in, for example, memory 88 at the WD 22, or stored in external memory (e.g., database, storage array, network storage device, etc.) accessible by the WD 22.
  • the software 90 may be executable by the processing circuitry 84.
  • the client application 92 may be operable to provide a service to a human or non-human user via the WD 22, with the support of the host computer 24.
  • an executing host application 50 may communicate with the executing client application 92 via the OTT connection 52 terminating at the WD 22 and the host computer 24.
  • the client application 92 may receive request data from the host application 50 and provide user data in response to the request data.
  • the OTT connection 52 may transfer both the request data and the user data.
  • the client application 92 may interact with the user to generate the user data that it provides.
  • the processing circuitry 84 may be configured to control any of the methods and/or processes described herein and/or to cause such methods, and/or processes to be performed, e.g., by WD 22.
  • the processor 86 corresponds to one or more processors 86 for performing WD 22 functions described herein.
  • the WD 22 includes memory 88 that is configured to store data, programmatic software code and/or other information described herein.
  • the software 90 and/or the client application 92 may include instructions that, when executed by the processor 86 and/or processing circuitry 84, causes the processor 86 and/or processing circuitry 84 to perform the processes described herein with respect to WD 22.
  • the processing circuitry 84 of the wireless device 22 may include a PHR unit 34 configured to perform one or more wireless device 22 functions as described herein such as with respect to changing of a power class at a wireless device 22.
  • the PHR unit 34 may be configured to perform a power class change from a first power class value to a second power class value at a time instant associated with the PH reporting event.
  • the inner workings of the network node 16, WD 22, and host computer 24 may be as shown in FIG.2 and independently, the surrounding network topology may be that of FIG.1.
  • the OTT connection 52 has been drawn abstractly to illustrate the communication between the host computer 24 and the wireless device 22 via the network node 16, without explicit reference to any intermediary devices and the precise routing of messages via these devices.
  • Network infrastructure may determine the routing, which it may be configured to hide from the WD 22 or from the service provider operating the host computer 24, or both. While the OTT connection 52 is active, the network infrastructure may further take decisions by which it dynamically changes the routing (e.g., on the basis of load balancing consideration or reconfiguration of the network).
  • the wireless connection 64 between the WD 22 and the network node 16 is in accordance with the teachings of the embodiments described throughout this disclosure.
  • One or more of the various embodiments improve the performance of OTT services provided to the WD 22 using the OTT connection 52, in which the wireless connection 64 may form the last segment. More precisely, the teachings of some of these embodiments may improve the data rate, latency, and/or power consumption and thereby provide benefits such as reduced user waiting time, relaxed restriction on file size, better responsiveness, extended battery lifetime, etc.
  • a measurement procedure may be provided for the purpose of monitoring data rate, latency and other factors on which the one or more embodiments improve.
  • the measurement procedure and/or the network functionality for reconfiguring the OTT connection 52 may be implemented in the software 48 of the host computer 24 or in the software 90 of the WD 22, or both.
  • sensors (not shown) may be deployed in or in association with communication devices through which the OTT connection 52 passes; the sensors may participate in the measurement procedure by supplying values of the monitored quantities exemplified above, or supplying values of other physical quantities from which software 48, 90 may compute or estimate the monitored quantities.
  • the reconfiguring of the OTT connection 52 may include message format, retransmission settings, preferred routing etc.; the reconfiguring need not affect the network node 16, and it may be unknown or imperceptible to the network node 16. Some such procedures and functionalities may be known and practiced in the art.
  • measurements may involve proprietary WD signaling facilitating the host computer’s 24 measurements of throughput, propagation times, latency and the like.
  • the measurements may be implemented in that the software 48, 90 causes messages to be transmitted, in particular empty or ‘dummy’ messages, using the OTT connection 52 while it monitors propagation times, errors, etc.
  • the host computer 24 includes processing circuitry 42 configured to provide user data and a communication interface 40 that is configured to forward the user data to a cellular network for transmission to the WD 22.
  • the cellular network also includes the network node 16 with a radio interface 62.
  • the network node 16 is configured to, and/or the network node’s 16 processing circuitry 68 is configured to perform the functions and/or methods described herein for preparing/initiating/maintaining/ supporting/ending a transmission to the WD 22, and/or preparing/terminating/ maintaining/supporting/ending in receipt of a transmission from the WD 22.
  • the host computer 24 includes processing circuitry 42 and a communication interface 40 that is configured to a communication interface 40 configured to receive user data originating from a transmission from a WD 22 to a network node 16.
  • the WD 22 is configured to, and/or comprises a radio interface 82 and/or processing circuitry 84 configured to perform the functions and/or methods described herein for preparing/initiating/maintaining/ supporting/ending a transmission to the network node 16, and/or preparing/ terminating/maintaining/supporting/ending in receipt of a transmission from the network node 16.
  • FIGS.1 and 2 show various “units” such as indication unit 32, and PHR unit 34 as being within a respective processor, it is contemplated that these units may be implemented such that a portion of the unit is stored in a corresponding memory within the processing circuitry. In other words, the units may be implemented in hardware or in a combination of hardware and software within the processing circuitry.
  • FIG.3 is a flowchart illustrating an example method implemented in a communication system, such as, for example, the communication system of FIGS.1 and 2, in accordance with one embodiment.
  • the communication system may include a host computer 24, a network node 16 and a WD 22, which may be those described with reference to FIG.2.
  • the host computer 24 provides user data (Block S100).
  • the host computer 24 provides the user data by executing a host application, such as, for example, the host application 50 (Block S102).
  • the host computer 24 initiates a transmission carrying the user data to the WD 22 (Block S104).
  • the network node 16 transmits to the WD 22 the user data which was carried in the transmission that the host computer 24 initiated, in accordance with the teachings of the embodiments described throughout this disclosure (Block S106).
  • the WD 22 executes a client application, such as, for example, the client application 92, associated with the host application 50 executed by the host computer 24 (Block S108).
  • FIG.4 is a flowchart illustrating an example method implemented in a communication system, such as, for example, the communication system of FIG.1, in accordance with one embodiment.
  • the communication system may include a host computer 24, a network node 16 and a WD 22, which may be those described with reference to FIGS.1 and 2.
  • the host computer 24 provides user data (Block S110).
  • the host computer 24 provides the user data by executing a host application, such as, for example, the host application 50.
  • the host computer 24 initiates a transmission carrying the user data to the WD 22 (Block S112).
  • the transmission may pass via the network node 16, in accordance with the teachings of the embodiments described throughout this disclosure.
  • the WD 22 receives the user data carried in the transmission (Block S114).
  • FIG.5 is a flowchart illustrating an example method implemented in a communication system, such as, for example, the communication system of FIG.1, in accordance with one embodiment.
  • the communication system may include a host computer 24, a network node 16 and a WD 22, which may be those described with reference to FIGS.1 and 2.
  • the WD 22 receives input data provided by the host computer 24 (Block S116).
  • the WD 22 executes the client application 92, which provides the user data in reaction to the received input data provided by the host computer 24 (Block S118).
  • the WD 22 provides user data (Block S120).
  • the WD provides the user data by executing a client application, such as, for example, client application 92 (Block S122).
  • the executed client application 92 may further consider user input received from the user. Regardless of the specific manner in which the user data was provided, the WD 22 may initiate, in an optional third substep, transmission of the user data to the host computer 24 (Block S124). In a fourth step of the method, the host computer 24 receives the user data transmitted from the WD 22, in accordance with the teachings of the embodiments described throughout this disclosure (Block S126).
  • FIG.6 is a flowchart illustrating an example method implemented in a communication system, such as, for example, the communication system of FIG.1, in accordance with one embodiment.
  • the communication system may include a host computer 24, a network node 16 and a WD 22, which may be those described with reference to FIGS.1 and 2.
  • the network node 16 receives user data from the WD 22 (Block S128). In an optional second step, the network node 16 initiates transmission of the received user data to the host computer 24 (Block S130). In a third step, the host computer 24 receives the user data carried in the transmission initiated by the network node 16 (Block S132).
  • FIG.7 is a flowchart of an example process in a network node 16 according to some embodiments of the present disclosure. One or more blocks described herein may be performed by one or more elements of network node 16 such as by one or more of processing circuitry 68 (including the indication unit 32), processor 70, radio interface 62 and/or communication interface 60.
  • Network node 16 is configured to receive (Block S134) a power headroom report, PHR, indicating a PHR reporting event associated with a first time instant, as described herein.
  • Network node 16 is configured to indicate (Block S136) a change of a power class of the wireless device 22 from a first value to a second value at the time instant associated with the PHR reporting event, as described herein.
  • the processing circuitry 68 is further configured to: receive a first uplink transmission and a second uplink transmission from the wireless device 22 where the first uplink transmission precedes the first time instant associated with the PHR reporting event and is in accordance with the first value of the power class, and where the second uplink transmission succeeds (or occurs after or occurs immediately after) the first time instant associated with the PHR reporting event and in accordance with the second value of the power class.
  • the first time instant associated with the PHR reporting event one of: occurs at the time of the PHR reporting event; and occurs before or after the PHR reporting event within a time interval, the time interval being a predetermined length of time.
  • the power class values correspond to one of: power class values activated serving cell of an operating band; and power class values of at least one activated serving cells in a configured band combination for carrier aggregation, CA, or dual connectivity, DC.
  • FIG.8 is a flowchart of an example process in a wireless device 22 according to some embodiments of the present disclosure.
  • One or more blocks described herein may be performed by one or more elements of wireless device 22 such as by one or more of processing circuitry 84 (including the PHR unit 34), processor 86, radio interface 82 and/or communication interface 60.
  • Wireless device 22 is configured to determine (Block S138) a power headroom report, PHR, indicating a PHR reporting event associated with a first time instant, as described herein.
  • Wireless device 22 is configured to cause (Block S140) transmission of the PHR to the network node 16, as described herein.
  • the wireless device 22 is configured to receive (Block S142) an indication of a change of a power class of the wireless device 22 from a first value to a second value at the time instant associated with the PHR reporting event, the indication being based on the PHR, as described herein.
  • the processing circuitry 84 is further configured to: cause transmission of a first uplink transmission and a second uplink transmission where the first uplink transmission precedes the first time instant associated with the PHR reporting event and is in accordance with the first value of the power class, where the second uplink transmission succeeds (or occurs after or immediately after) the first time instant associated with the PHR reporting event and is in accordance with the second value of the power class.
  • the first time instant associated with the PHR reporting event one of: occurs at the time of the PHR reporting event; and occurs before or after the PHR reporting event within a time interval, the time interval being a predetermined length of time.
  • the power class values correspond to one of: power class values activated serving cell of an operating band; and power class values of at least one activated serving cells in a configured band combination for carrier aggregation, CA, or dual connectivity, DC.
  • FIG.9 is a flowchart of an example process in a wireless device 22 according to some embodiments of the present disclosure.
  • One or more blocks described herein may be performed by one or more elements of wireless device 22 such as by one or more of processing circuitry 84 (including the PHR unit 34), processor 86, radio interface 82 and/or communication interface 60.
  • Wireless device 22 is configured to transmit (Block S144) a power headroom report, PHR, to the network node in response to a power headroom, PH, reporting event.
  • the process also includes performing (Block S146) a power class change from a first power class value to a second power class value at a time instant associated with the PH reporting event.
  • the method includes applying the power class change to uplink transmissions subsequent to the time instant associated with the PH reporting event.
  • the time instant occurs within a preconfigured interval of time preceding or following the PH reporting event.
  • the preconfigured interval of time within is at most two time slots of the PH reporting event.
  • the time instant occurs at a time of the PH reporting event.
  • each of the first and second power class value corresponds to an activated serving cell.
  • each of the first and second power class value corresponds to at least one activated serving cell in a configured band combination for carrier aggregation or dual connectivity.
  • the PHR is configured for an activated serving cell.
  • the PHR is configured for at least one activated serving cell in a configured band combination for carrier aggregation or dual connectivity.
  • the power class change is associated with at least one of: specific absorption ratio, SAR, limits, maximum permissible exposure, MPE, limits, internal heat limitations, transmission duty cycle and radio resource control, RRC, reconfiguration of a band combination for carrier aggregation or dual connectivity.
  • the method includes applying the power class change for a serving cell of a configured operating band before a radio resource control, RRC, reconfiguration. In some embodiments, the method includes applying the power class change for at least one serving cell of a configured operating band combination for carrier aggregation or dual connectivity after a radio resource control, RRC, reconfiguration.
  • the PH reporting event is at least one of: expiry of a prohibit timer and a change in path loss that exceeds a threshold for at least one path loss reference signal for an activated serving cell of a medium access control, MAC, entity of which a downlink bandwidth part, BWP, is dormant since a last transmission of a PHR in the MAC entity when the MAC entity has uplink, UL, resources for a new transmission; expiry of a periodic timer; configuration of a PH reporting functionality by upper layers; activation of the MAC entity with a configured uplink of which a BWP parameter is not set to a dormant BWP; activation of a secondary cell group, SCG; addition of a primary special cell, PSCell, unless the SCG is deactivated; expiry of a prohibit time when the MAC entity has UL resources for a new transmission and the following is true for an activated serving cell of any MAC entity with a configured uplink: UL resources are allocated for transmission
  • a wireless device 22 is connected to a network node 16.
  • the network node 16 is allocating transmission resources to the wireless device 22 determined by reported capabilities from the wireless device 22 including power capability (power class) and power headroom reports.
  • the network node 16 may also use other complementary means for allocating resources such as measurements of uplink transmission quality from the wireless device 22.
  • the wireless device 22 For wireless devices 22 capable of higher power capabilities such that exposure limits are exceeded in case the uplink duty cycle exceeds a threshold ( ⁇ 1) specified or implementation specific, the wireless device 22 changes its power capability from P1 to P2 ⁇ P1 affecting the determination of the configured maximum output power and thus the reported power headroom (PHR).
  • a threshold ⁇ 1 specified or implementation specific
  • the wireless device 22 changes its power capability from P1 to P2 ⁇ P1 affecting the determination of the configured maximum output power and thus the reported power headroom (PHR).
  • PHR power headroom
  • the wireless device 22 includes a first power class P1 as part of capability reporting for an uplink serving cell.
  • the wireless device 22 falls back to a second power class P2 ⁇ P1 if SAR or MPE limits or wireless device 22 internal heat limitations cannot be fulfilled by the wireless device 22.
  • the condition for this fallback is either specified (uplink transmission duty cycle) or based on wireless device 22 implementation.
  • the wireless device 22 restores the first power class P1.
  • Both P1 and P2 affect the configured output maximum output power the ⁇ ⁇ , ⁇ , ⁇ .
  • FIG.10 is a diagram of an example transition from P1 to P2 when the PHR is reported using the resources on a UL grant received and indicated by a downlink control information DCI (PDCCH).
  • the transition between P1 to P2 is made associated with an event, which is in this embodiment the PHR reporting/transmission occasion.
  • the transition at the PHR reporting/transmission occasion occurs before (as shown by the dotted line) a wireless device 22 implementation-specific transition that may occur T_PHR later according to current NR specifications. Since the transition occurs associated with the event in the embodiment, the network node 16 may measure the PUSCH to determine the effect of ⁇ ⁇ on the transmitted power, and to take this into account in its scheduling. This embodiment also enables the wireless device 22 to save the power consumption during the T_PHR time. However, if the wireless device 22 changes ⁇ ⁇ after T_PHR, which is unknown to the network node 16, it may be difficult for the network node 16 to have accurate measurements of wireless device 22 power that are adjusted by ⁇ ⁇ .
  • FIG.11 is a diagram of an example transition from P2 to P1 when the PHR is reported using the resources on a configured UL grant.
  • the transition between P1 to P2 is made associated with an event, which is in this embodiment the PHR reporting/transmission occasion.
  • the transition at the PHR reporting/transmission occasion occurs later (the dotted line) than a wireless device 22 implementation-specific transition according to the current NR specifications, and that would have occurred T_PHR earlier.
  • This embodiment enables the wireless device 22 to save the power consumption during the T_PHR time.
  • This embodiment also enables the network node 16 to be aware of when the switch between P2 and P1 is made, and so shares the benefit described above where the network may have accurate measurements of wireless device 22 power that are adjusted by ⁇ ⁇ .
  • the wireless device 22 switches between P1 and P2 at a time that is no later than ⁇ ⁇ either before or after the PHR reporting/transmission occasion, where ⁇ ⁇ is a predetermined length of time.
  • ⁇ ⁇ is a predetermined length of time.
  • Such embodiments may be beneficial to allow some flexibility to wireless device 22 to adjust ⁇ ⁇ according to their implementation, but still allow the network node 16 to have a time at which it knows a change in ⁇ ⁇ should be applied to uplink transmissions, and therefore to make measurements of wireless device 22 power that are adjusted by ⁇ ⁇ .
  • the predetermined length of time for ⁇ ⁇ may be wireless device 22 specific depending on the wireless device 22 implementation for some transit time needed but may not exceed the time difference between triggering the PHR and the actual PHR transmission.
  • it may be a numbers of slots before or after the PHR reporting/transmission occasion/event.
  • it may be 1 slot which means +- 1 slot of the PHR transmission slot.
  • it may be 2 slots.
  • it may be either +1 or -2 slots in either before or after the PHR transmission slot.
  • There may be a plurality of maximum power capabilities for a serving cell in an operating band, P0, P1, ... Pn; transitions between these operating bands also occur when PHR is transmitted and when PHR is configured on the serving cell.
  • multi-entry PHR multi-entry PHR
  • MPE or SAR compliance is not affected by the T_PHR since the transmission time scale (in the order of ms) is much shorter than that used for measuring SAR (in the order of 30 seconds) and MPE (2-4 s above 10 GHz). Transitions between P1 and P2 not for the purpose of SAR/MPE compliance or wireless device 22 internal heat management does not have to coincide with PHR reporting: transitions between P1 and P2 (change of ⁇ ⁇ ) for the purpose of SRS transmissions used for antenna switching with wireless devices 22 supporting transmission diversity do not have to coincide with PHR reports but occurs at the actual SRS transmission occasion as specified in 3GPP standards such as in, for example, 3GPP TS 38.101-1 v17.6.02022-06.
  • FIG.12 is a diagram of another example of a power class change upon a RRC reconfiguration of a band combination for CA or DC, e.g., Pcell supports P1 for non-CA but P2 for CA (even if non-CA in the UL).
  • Example 1 A method of managing power class change, at a wireless device 22 capable of communicating to the network node 16 with more than one power class, wherein the wireless device 22 is operated in one or more than one serving cells, comprising: - Triggering a Power Headroom Reporting (PHR) - Reporting the PHR - Changing power class of the wireless device 22 from a first value to a second value at a time instant associated with the PHR reporting event, the method further comprising: o all UL transmissions preceding the time instant associated with the PHR reporting event are according to the first value of the power class; and o all UL transmissions succeeding the time instant associated with the PHR reporting event are according to the second value of the power class.
  • PHR Power Headroom Reporting
  • Example 2 A method according to Example 1, wherein the time instant associated with the PHR reporting event comprises one of the following: - the time instant occurs at the time of the PHR reporting event - the time instant occurs before or after the PHR reporting event within a time interval, wherein the time interval comprises a predetermined length of time.
  • Example 3 A method according to Example 1, wherein the reporting PHR comprises one of the following: - the PHR is transmitted by a PUSCH, o wherein the PUSCH is configured by a UL grant, received in DL DCI by the wireless device 22.
  • Example 4 A method according to at least one of Examples 1-3, changing power class of the wireless device 22 from a first value to a second value further comprising: - wherein the power class values correspond to one of the following: o One activated serving cell of an operating band o At least one activated serving cells in a configured band combination for CA or DC
  • Example 5 A method according to Example 3, wherein the PHR is configured for one of the following: - One activated serving cell of an operating band - At least one activated serving cells in a configured band combination for CA or DC
  • Example 6 A method according to at least one of Examples 1-5, changing power class of the wireless device 22 from a first value to a second value further associated with one or more than one of the following conditions: - SAR limits - MPE limits - UE internal heat limitation - UL transmission duty cycle - RRC reconfiguration of
  • Example 8 A wireless device 22 (e.g., UE) capable of communicating to the network node 16 with more than one power class, where the wireless device 22 is operated in one or more than one serving cells, comprising: - A module of managing power class change, includes: o Triggering a Power Headroom Reporting (PHR) o Reporting the PHR o Changing power class of the wireless device 22 from a first value to a second value at a time instant associated with the PHR reporting event, the method further comprising: ⁇ all UL transmissions preceding the time instant associated with the PHR reporting event are according to the first value of the power class; and ⁇ all UL transmissions succeeding the time instant associated with the PHR reporting event are according to the second value of the power class.
  • PHR Power Headroom Reporting
  • the network node 16 connected to the wireless device 22 allocates transmissions resources according to the reported power capability that is the same as the actual power capability. From a lower first power capability to a second higher power capability: reduced power consumption at the wireless device 22, the wireless device 22 applying a power capability in accordance to the last reported power capability to the network node 16. From a higher first power capability to a lower power capability: reduced risk of retransmissions since, the wireless device 22 does not apply a power capability lower than that last reported to -- and assumed for transmission resources by -- the network node 16.
  • Embodiment A1 A network node configured to communicate with a wireless device, the network node configured to, and/or comprising a radio interface and/or comprising processing circuitry configured to: receive a power headroom report, PHR, indicating a PHR reporting event associated with a first time instant; and indicate a change of a power class of the wireless device from a first value to a second value at the time instant associated with the PHR reporting event.
  • PHR power headroom report
  • the network node of Embodiment A1 wherein the processing circuitry is further configured to: receive a first uplink transmission and a second uplink transmission from the wireless device, the first uplink transmission preceding the first time instant associated with the PHR reporting event and being in accordance with the first value of the power class; and the second uplink transmission succeeding the first time instant associated with the PHR reporting event and in accordance with the second value of the power class.
  • Embodiment A3 The network node of any one of Embodiments A1-A2, wherein the first time instant associated with the PHR reporting event one of: occurs at the time of the PHR reporting event; and occurs before or after the PHR reporting event within a time interval, the time interval being a predetermined length of time.
  • Embodiment B1 A method implemented in a network node that is configured to communicate with a wireless device, the method comprising: receiving a power headroom report, PHR, indicating a PHR reporting event associated with a first time instant; and indicating a change of a power class of the wireless device from a first value to a second value at the time instant associated with the PHR reporting event.
  • PHR power headroom report
  • Embodiment B2 A method implemented in a network node that is configured to communicate with a wireless device, the method comprising: receiving a power headroom report, PHR, indicating a PHR reporting event associated with a first time instant; and indicating a change of a power class of the wireless device from a first value to a second value at the time instant associated with the PHR reporting event.
  • Embodiment B1 further comprising: receiving a first uplink transmission and a second uplink transmission from the wireless device, the first uplink transmission preceding the first time instant associated with the PHR reporting event and being in accordance with the first value of the power class; and the second uplink transmission succeeding the first time instant associated with the PHR reporting event and in accordance with the second value of the power class.
  • Embodiment B3 The method of any one of Embodiments B1-B2, wherein the first time instant associated with the PHR reporting event one of: occurs at the time of the PHR reporting event; and occurs before or after the PHR reporting event within a time interval, the time interval being a predetermined length of time.
  • Embodiment C1 The method of any one of Embodiments B1-B3, wherein the power class values correspond to one of: power class values activated serving cell of an operating band; and power class values of at least one activated serving cells in a configured band combination for carrier aggregation, CA, or dual connectivity, DC.
  • a wireless device configured to communicate with a network node, the wireless device configured to, and/or comprising a radio interface and/or processing circuitry configured to: determine a power headroom report, PHR, indicating a PHR reporting event associated with a first time instant; cause transmission of the PHR to the network node; and receive an indication of a change of a power class of the wireless device from a first value to a second value at the time instant associated with the PHR reporting event, the indication being based on the PHR.
  • PHR power headroom report
  • PHR indicating a PHR reporting event associated with a first time instant
  • the wireless device of Embodiment C1 wherein the processing circuitry is further configured to: cause transmission of a first uplink transmission and a second uplink transmission, the first uplink transmission preceding the first time instant associated with the PHR reporting event and being in accordance with the first value of the power class; and the second uplink transmission succeeding the first time instant associated with the PHR reporting event and being in accordance with the second value of the power class.
  • Embodiment C3 The wireless device of any one of Embodiments C1-C2, wherein the first time instant associated with the PHR reporting event one of: occurs at the time of the PHR reporting event; and occurs before or after the PHR reporting event within a time interval, the time interval being a predetermined length of time.
  • a method implemented in a wireless device that is configured to communicate with a network node comprising: determining a power headroom report, PHR, indicating a PHR reporting event associated with a first time instant; causing transmission of the PHR to the network node; and receiving an indication of a change of a power class of the wireless device from a first value to a second value at the time instant associated with the PHR reporting event, the indication being based on the PHR.
  • Embodiment D1 further comprising: causing transmission of a first uplink transmission and a second uplink transmission, the first uplink transmission preceding the first time instant associated with the PHR reporting event and being in accordance with the first value of the power class; and the second uplink transmission succeeding the first time instant associated with the PHR reporting event and being in accordance with the second value of the power class.
  • Embodiment D3 The method of any one of Embodiments D1-D2, wherein the first time instant associated with the PHR reporting event one of: occurs at the time of the PHR reporting event; and occurs before or after the PHR reporting event within a time interval, the time interval being a predetermined length of time.
  • the power class values correspond to one of: power class values activated serving cell of an operating band; and power class values of at least one activated serving cells in a configured band combination for carrier aggregation, CA, or dual connectivity, DC.
  • the concepts described herein may be embodied as a method, data processing system, computer program product and/or computer storage media storing an executable computer program.
  • the concepts described herein may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects all generally referred to herein as a “circuit” or “module.” Any process, step, action and/or functionality described herein may be performed by, and/or associated to, a corresponding module, which may be implemented in software and/or firmware and/or hardware.
  • the disclosure may take the form of a computer program product on a tangible computer usable storage medium having computer program code embodied in the medium that may be executed by a computer. Any suitable tangible computer readable medium may be utilized including hard disks, CD-ROMs, electronic storage devices, optical storage devices, or magnetic storage devices.
  • These computer program instructions may also be stored in a computer readable memory or storage medium that may direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer readable memory produce an article of manufacture including instruction means which implement the function/act specified in the flowchart and/or block diagram block or blocks.
  • the computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions/acts specified in the flowchart and/or block diagram block or blocks.
  • the program code may execute entirely on the user's computer, partly on the user's computer, as a stand-alone software package, partly on the user's computer and partly on a remote computer or entirely on the remote computer.
  • the remote computer may be connected to the user's computer through a local area network (LAN) or a wide area network (WAN), or the connection may be made to an external computer (for example, through the Internet using an Internet Service Provider).
  • LAN local area network
  • WAN wide area network
  • Internet Service Provider for example, AT&T, MCI, Sprint, EarthLink, etc.

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Abstract

A method, system and apparatus are disclosed. According to some embodiments, a wireless device configured to communicate with a network node is provided. The wireless device (WD) is configured to transmit a power headroom report, PHR, to the network node in response to a power headroom (PH) reporting event. The wireless device is also configured to perform a power class change from a first power class value to a second power class value at a time instant associated with the PH reporting event.

Description

WIRELESS DEVICE CHANGING POWER CLASS AT INSTANT OF REPORTING POWER HEADROOM TECHNICAL FIELD The present disclosure relates to wireless communications, and in particular, to changing of a power class at a wireless device. BACKGROUND The Third Generation Partnership Project (3GPP) has developed and is developing standards for Fourth Generation (4G) (also referred to as Long Term Evolution (LTE)) and Fifth Generation (5G) (also referred to as New Radio (NR)) wireless communication systems. Such systems provide, among other features, broadband communication between network nodes, such as base stations, and mobile wireless devices (WD), as well as communication between network nodes and between WDs. Sixth Generation (6G) wireless communication systems are also under development. The technical background described below is explained for the 5G NR standard with references to the 4G LTE standard but may apply to any system with similar uplink power reporting events. Network node may refer to a central node while wireless device may refer to a device connected to the network node. For 4G and 5G, the power reporting is referred to as a power-headroom report that is governed by the power capability and uplink power control. Power control and power capability Power capability determines the maximum wireless device uplink power per cell or for carrier aggregation (CA). The uplink power remaining given a transmission allocation by the network node is also reported to the network node (by power headroom reporting). The wireless device output power for uplink transmissions (wireless device to network node) is controlled independently for each cell c and carrier frequency f. The power control for uplink transmissions in a transmission occasion i typically involve both open- and closed-loop control
Figure imgf000003_0001
where ^^ is the target received power at the receiver (the network node for NR), ^^^,^ the path-loss estimate with a weight factor ^^,^ (the sum ^^ + ^^,^^^^,^ the transmission resources required output power per resource for open-loop control), ^^,^ the allocated resource bandwidth, ∆^,^ including factors such as the uplink modulation format and ^^,^ a relative power change for closed-loop control. The output power determined by open- and closed loop power is limited by the maximum output power ^^^^^,^,^(^) configured (computed) by the wireless device for cell c and carrier frequency f. The configured ^^^^^,^,^(^) applies for all types of transmissions (physical uplink control channel (PUCCH), physical uplink shared channel (PUSCH) and sounding reference signal (SRS)) and is in turn capped by the power capability ^^^^^^ ^^^^^ . For NR in frequency range FR1 below 7 GHz for which the output power may be measured at the antenna connector, the ^^^^^,^,^(^) configured may essentially be described by ^^^^^,^,^ (^)~^^^ ^^^^^^^ ^^^^^, ^^^^^^^^ ^^^^^, ^^^^, ^^^^^ and hence limited by ^ the power capability ^^^^^^ ^^^^^ of the wireless device, indicated to the network by wireless device capability signaling ^ a function ^^^^^^^^ ^^^^^, ^^^^ ≤ ^^^^^^ ^^^^^ of the power capability and maximum power reductions MPR allowed for compliance with, e.g., unwanted emissions requirements ^ a cell-specific or wireless device-specific limitation ^^^^ (absolute) indicated to the wireless device by the network node in the system information broadcasted in the cell or by dedicated signaling to the wireless device. The wireless device is allowed a power-back-off up to MPR (dB) but does not necessarily use the full allowance. The ^^^^^,^,^(^) is therefore specified in a range, from 3GPP standards such as, for example, 3GPP Technical Standard (TS) 38.101-1 v17.6.02022-06 for a single serving cell in FR1, The configured maximum output power
Figure imgf000004_0001
is set within the following bounds: PCMAX_L,f,c ≤ PCMAX,f,c ≤ PCMAX_H,f,c with
Figure imgf000004_0002
where the lower bound is governed by the maximum allowed back-off MPR while both the upper and lower bounds are limited by the power class (power capability) ^^^^^^ ^^^^^ and a cell-specific limit class ^^^^ (the ^^^^^,^). Other allowed power reductions accounting for, e.g., filter attenuation (∆^^) also reduce the lower bound at the edges of carriers but are not included in what follows for notational simplicity without loss of generality. The upper bound corresponds to the case in which the wireless device is not applying any power back-off and is limited by the power class and power limits only. The power class may be modified by ∆^^^^^^^^^^^ in case the maximum power capability must be reduced for e.g. exposure compliance (SAR). Power-class (power capability) modification and exposure compliance Power class/capability may be modified for compliance with maximum exposure (MPE) measured as a Specific Absorption Ratio (SAR) below 10 GHz and MPE (usually) measured as a power-flux density for higher frequencies. These limits are averaged in time and thus determined by both the power level and the uplink (UL) duty cycle. There are two different allowances. The power class in the power-control equations may be modified by ∆^^^^^^ ^^^^^ under specific conditions e.g. when the uplink transmission duty cycle exceeds a threshold in time division duplex (TDD) bands (UL/downlink (DL) configuration). The conditions are specified but not the event in time at which the ∆^^^^^^ ^^^^^ is applied. The other allowance is a proprietary power back-off denoted P- MPR (‘P’ for power management) the limits of which is not specified. This back-off is often used in case proximity sensors detect the presence of a user/wireless device and may be applied at any instance in time. Both allowances affect the UL power and thus also the reporting of remaining uplink power in the power-headroom report. The power class may also be reduced due to internal wireless device heat management. Carrier aggregation and power capability Power capability is also reported for CA with more than one serving cell in the uplink. For carrier aggregation (CA), the wireless device configures a maximum total power ^^^^^ for all aggregated serving cells of a CA combination. For Frequency Range 1 (FR1) the ^^^^^ is specified at the antenna connector and includes the power back-off applied on the serving cells part of the CA configuration. Inter-band UL CA is essentially the sum of the configured power per cell and capped by the power class ∆^^^^^^ ^^^^^,^^ of the CA band combination as described in 3GPP standards such as in, for example, 3GPP TS 38.101-1 v17.6.02022-06: The total configured maximum output power PCMAX is set within the following bounds: PCMAX_L ≤ PCMAX ≤ PCMAX_H For uplink inter-band carrier aggregation with one serving cell c per operating band when same slot symbol pattern is used in all aggregated serving cells, PCMAX_L = MIN {10log10∑ MIN [ pEMAX,c/ ( ^tC,c), pPowerClass.c/(MAX(mprc·∆mprc, a-mprc)· ^tC,c · ^tIB,c· ^tRxSRS,c) , pPowerClass,c/pmprc], PEMAX,CA, PPowerClass,CA- ΔPPowerClass, CA} PCMAX_H = MIN{10 log10 ∑ pEMAX,c , PEMAX,CA, PPowerClass,CA-ΔPPowerClass, CA The configured total power ^^^^^ for all aggregated serving cells of a CA combination is used for prioritizations of transmission power when the wireless device is power limited, such as from, for example, 3GPP TS 38.213 v17.3.02022-09. Prioritizations for transmission power reductions For single cell operation with two uplink carriers or for operation with carrier aggregation, if a total wireless device transmit power for PUSCH or PUCCH or physical random access channel (PRACH) or SRS transmissions on serving cells in a frequency a respective transmission occasion i ˆ range in would exceed
Figure imgf000006_0001
, is the linear value of P CMAX( i ) in transmission occasion i as defined in 3GPP standards such as in, for example, 3GPP Technical Specification (TS) 38.101-1 for FR1 and 3GPP TS38.101-2 for FR2, the wireless device 22 allocates power to PUSCH/PUCCH/PRACH/SRS transmissions according to the following priority order (in descending order) so that the total wireless device transmit power for transmissions on serving cells in the frequency range is smaller than or equal to
Figure imgf000006_0002
for that frequency range in every symbol of transmission occasion i . When determining a total transmit power for serving cells in a frequency range in a symbol of transmission occasion i , the wireless device does not include power for transmissions starting after the symbol of transmission occasion i . The total wireless device transmit power in a symbol of a slot is defined as the sum of the linear values of wireless device transmit powers for PUSCH, PUCCH, PRACH, and SRS in the symbol of the slot. - PRACH transmission on the Pcell - PUCCH or PUSCH transmissions with higher priority index according to Clause 9 - For PUCCH or PUSCH transmissions with same priority index - PUCCH transmission with HARQ-ACK information, and/or SR, and/or LRR, or PUSCH transmission with HARQ-ACK information - PUCCH transmission with CSI or PUSCH transmission with CSI - PUSCH transmission without HARQ-ACK information or CSI and, for Type-2 random access procedure, PUSCH transmission on the PCell - SRS transmission, with aperiodic SRS having higher priority than semi- persistent and/or periodic SRS, or PRACH transmission on a serving cell other than the Pcell. In cases of the same priority order and for operation with carrier aggregation, the wireless device prioritizes power allocation for transmissions on the primary cell of the MCG or the SCG over transmissions on a secondary cell. In case of same priority order and for operation with two UL carriers, the wireless device prioritizes power allocation for transmissions on the carrier where the wireless device is configured to transmit PUCCH. If PUCCH is not configured for any of the two UL carriers, the wireless device prioritizes power allocation for transmissions on the non-supplementary UL carrier. Given a total power ^^^^^ , the wireless device allocates power for transmission types in a priority order when power limited. This means that, e.g., that the primary cell (PCell) is prioritized for a given transmission, e.g., for simultaneous PUSCH transmissions on multiple serving cells. The power class of the CA configuration may also be modified to account for MPE requirements by ∆^^^^^^ ^^^^^,^^ for concurrent uplink transmissions on more several uplink serving cells. This means that the wireless device would start prioritizing the uplink power at ∆^^^^^^ ^^^^^,^^ lower output power (dB scale). The conditions at which this is allowed is specified for selected cases and may depend on the uplink duty cycles on the serving cells. The power class for band combination (CA or dual-connectivity) may be different from the power-class for the constituent bands. In case the ^^^^^^ ^^^^^,^^ possibly modified by ∆^^^^^^ ^^^^^,^^ for the band combination is lower than the ^^^^^^ ^^^^^ for constituent band, transmission power on the latter would be prioritized (reduced). Power headroom reporting The power capability determines the power headroom (PH) reported in the power- headroom report (PH)
Figure imgf000007_0001
the ratio/difference (linear/dB) between the configured maximum output power (depending on the power class)
Figure imgf000007_0002
and the estimated output power required for the uplink transmission scheduled by the network node. A positive value (in dB) means that there is remaining power available while a negative PH means that the uplink power is capped by the maximum power and that there is a power deficiency for the uplink allocation. The maximum output power is also reported in the PHR. In case the maximum power is modified by ∆^^^^^^ ^^^^^ or P-MPR (or any other power back-off included in the ^^^^^,^,^) then the PH is changed for a given scheduled uplink transmission. The PH may be based on an actual transmission with a scheduled uplink resource (^^,^ (^) in the expression above) or a reference format without a scheduled resource and an assumption that all power back-off are set to zero (including P-MPR). The wireless device determines the PHR as described in 3GPP standards such as in, for example, 3GPP TS 38.213 v17.3.02022-09, as follows: determines whether PH value for an activated Serving Cell is based on real transmission or a reference format by considering the configured grant(s) or periodic/semi-persistent SRS transmissions and downlink control information which has been received until and including the physical downlink control channel (PDCCH) occasion in which the first UL grant for a new transmission is received since a PHR has been triggered if the PHR medium access control (MAC) control element (CE) is reported on an uplink grant received on the PDCCH or until the first uplink symbol of PUSCH transmission minus PUSCH preparation time as defined in subclause 3GPP TS 38.214 if the PHR MAC CE is reported on a configured grant. The ∆^^^^^^^^^^^ affects the PHR for both an actual transmission and the reference format for both PUSCH and SRS. The application of ∆^^^^^^^^^^^ to uplink transmissions in time is up to wireless device implementation. According to 3GPP standards such as, for example, 3GPP TS 38.321 v17.1.0 2022-06, PHR is defined as below. [3GPP specification described starts here] Power Headroom Reporting The Power Headroom reporting procedure is used to provide the serving network node with the following information: - Type 1 power headroom: the difference between the nominal wireless device maximum transmit power and the estimated power for UL-shared channel (SCH) transmission per activated Serving Cell; - Type 2 power headroom: the difference between the nominal wireless device maximum transmit power and the estimated power for UL-SCH and PUCCH transmission on SpCell of the other MAC entity (i.e., E-UTRA MAC entity in EN-DC, NE-DC, and NGEN-DC cases); - Type 3 power headroom: the difference between the nominal wireless device maximum transmit power and the estimated power for SRS transmission per activated Serving Cell; - MPE P-MPR: the power backoff to meet the MPE FR2 requirements for a Serving Cell operating on FR2. RRC controls Power Headroom reporting by configuring the following parameters: - phr-PeriodicTimer; - phr-ProhibitTimer; - phr-Tx-PowerFactorChange; - phr-Type2OtherCell; - phr-ModeOtherCG; - multiplePHR; - mpe-Reporting-FR2; - mpe-ProhibitTimer; - mpe-Threshold; - numberOfN; - mpe-ResourcePool; - twoPHRMode. A Power Headroom Report (PHR) may be triggered if any of the following PH reporting events occur (thus the following are examples of PH report events): - phr-ProhibitTimer expires or has expired and the path loss has changed more than phr-Tx-PowerFactorChange dB for at least one RS used as pathloss reference for one activated Serving Cell of any MAC entity of which the active DL bandwidth part (BWP) is not dormant BWP since the last transmission of a PHR in this MAC entity when the MAC entity has UL resources for new transmission; NOTE 1: The path loss variation for one cell assessed above is between the pathloss measured at present time on the current pathloss reference and the pathloss measured at the transmission time of the last transmission of PHR on the pathloss reference in use at that time, irrespective of whether the pathloss reference has changed in between. The current pathloss reference for this purpose does not include any pathloss reference configured using pathlossReferenceRS-Pos in 3GPP TS 38.331. - phr-PeriodicTimer expires; - upon configuration or reconfiguration of the power headroom reporting functionality by upper layers, which is not used to disable the function; - activation of an SCell of any MAC entity with configured uplink of which firstActiveDownlinkBWP-Id is not set to dormant BWP; - activation of an SCG; - addition of the PSCell except if the secondary cell group (SCG) is deactivated (i.e., PSCell is newly added or changed); - phr-ProhibitTimer expires or has expired, when the MAC entity has UL resources for new transmission, and the following is true for any of the activated Serving Cells of any MAC entity with configured uplink: - there are UL resources allocated for transmission or there is a PUCCH transmission on this cell, and the required power backoff due to power management (as allowed by P-MPRc as specified in 3GPP TS 38.101-1, 3GPP TS 38.101- 2, and 3GPP TS 38.101-3) for this cell has changed more than phr-Tx- PowerFactorChange dB since the last transmission of a PHR when the MAC entity had UL resources allocated for transmission or PUCCH transmission on this cell. - Upon switching of activated BWP from dormant BWP to non-dormant DL BWP of an SCell of any MAC entity with configured uplink; - if mpe-Reporting-FR2 is configured, and mpe-ProhibitTimer is not running: - the measured P-MPR applied to meet FR2 MPE requirements as specified in 3GPP TS 38.101-2 is equal to or larger than mpe-Threshold for at least one activated FR2 Serving Cell since the last transmission of a PHR in this MAC entity; or - the measured P-MPR applied to meet FR2 MPE requirements as specified in 3GPP TS 38.101-2 has changed more than phr-Tx-PowerFactorChange dB for at least one activated FR2 Serving Cell since the last transmission of a PHR due to the measured P-MPR applied to meet MPE requirements being equal to or larger than mpe- Threshold in this MAC entity. - in which case the PHR is referred below to as 'MPE P-MPR report'. NOTE 2: The MAC entity may avoid triggering a PHR when the required power backoff due to power management decreases only temporarily (e.g., for up to a few tens of milliseconds) and it may avoid reflecting such temporary decrease in the values of PCMAX,f,c/PH when a PHR is triggered by other triggering conditions. NOTE 3: If a HARQ process is configured with cg-RetransmissionTimer and if the PHR is already included in a MAC PDU for transmission on configured grant by this HARQ process, but not yet transmitted by lower layers, it is up to wireless device implementation how to handle the PHR content. [Specification description text ends] According to 3GPP standards such as, for example, 3GPP TS 38.331 v17.1.02022-06, the PHR config is defined as below. [Specification description text starts] – PHR-Config The information element (IE) PHR-Config is used to configure parameters for power headroom reporting. PHR-Config information element -- ASN1START -- TAG-PHR-CONFIG-START PHR-Config ::= SEQUENCE { phr-PeriodicTimer ENUMERATED {sf10, sf20, sf50, sf100, sf200,sf500, sf1000, infinity}, phr-ProhibitTimer ENUMERATED {sf0, sf10, sf20, sf50, sf100,sf200, sf500, sf1000}, phr-Tx-PowerFactorChange ENUMERATED {dB1, dB3, dB6, infinity}, multiplePHR BOOLEAN, dummy BOOLEAN, phr-Type2OtherCell BOOLEAN, phr-ModeOtherCG ENUMERATED {real, virtual}, ..., [[ mpe-Reporting-FR2-r16 SetupRelease { MPE-Config-FR2-r16 } OPTIONAL -- Need M ]], [[ mpe-Reporting-FR2-r17 SetupRelease { MPE-Config-FR2-r17 } OPTIONAL, -- Need M twoPHRMode-r17 ENUMERATED {enabled} OPTIONAL -- Need R ]] } MPE-Config-FR2-r16 ::= SEQUENCE { mpe-ProhibitTimer-r16 ENUMERATED {sf0, sf10, sf20, sf50, sf100, sf200, sf500, sf1000}, mpe-Threshold-r16 ENUMERATED {dB3, dB6, dB9, dB12} } MPE-Config-FR2-r17 ::= SEQUENCE { mpe-ProhibitTimer-r17 ENUMERATED {sf0, sf10, sf20, sf50, sf100, sf200, sf500, sf1000}, mpe-Threshold-r17 ENUMERATED {dB3, dB6, dB9, dB12}, numberOfN-r17 INTEGER(1..4), ... } -- TAG-PHR-CONFIG-STOP -- ASN1STOP
Figure imgf000012_0001
Figure imgf000013_0001
[Specification description text ends] PHR is reported for PUSCH (Type 1) and SRS (Type 3). PH may be either single- entry (for a serving cell) or multi-entry including serving cells of a MR-DC or UL CA band combination. The latter is configured for the said band combinations, otherwise single-entry. The PHR may be either periodic (typically 20-50 ms) or triggered with phr- PeriodicTimer by events such as DL path loss changes affecting the UL power required or a P-MPR change if this is above a configurable threshold value. According to 3GPP standards, a PHR is triggered if any of the following events occur: - phr-ProhibitTimer expires or has expired and the path loss has changed more than phr-Tx-PowerFactorChange dB [configurable threshold] for at least one RS used as pathloss reference for one activated Serving Cell of any MAC entity of which the active DL BWP is not dormant BWP since the last transmission of a PHR in this MAC entity when the MAC entity has UL resources for new transmission; Relating to SAR and MPE compliance, a PHR is also triggered if the P-MPR is changed more than a configurable threshold with phr-Tx-PowerFactorChange for more than a few tenths of milliseconds (SAR a long-term average) when the wireless device has UL resources for new transmission: - there are UL resources allocated for transmission or there is a PUCCH transmission on this cell, and the required power backoff due to power management (as allowed by P-MPRc as specified in 3GPP TS 38.101-1, 3GPP TS 38.101-2, and 3GPP TS 38.101-3) for this cell has changed more than phr-Tx-PowerFactorChange dB since the last transmission of a PHR when the MAC entity had UL resources allocated for transmission or PUCCH transmission on this cell. The power capability change ∆^^^^^^^^^^^ is not coordinated with the power (headroom) reporting event, which leads to a misalignment between the power reported to (and assumed by) a network node and the actual power available from the wireless device. During the time when there is such misalignment existing, the power usage is not optimized for both the wireless device and the network node, from a system point of view. Hence, existing systems suffer from various inefficiencies that may negatively affect system optimization. SUMMARY Some embodiments advantageously provide methods, systems, and apparatuses for changing of a power class at a wireless device. The power capability modification (the change ∆^^^^^^^^^^^) to and from a first power capability to a second power capability amongst a plurality of power capabilities is conditioned on (aligned with) reporting events of available power and capability (PHR). The power capability modification is equivalent as power class change. The power class change includes changing from a higher power class to a lower power class and changing from a lower power class to a higher power class, for at least one serving cells or a CA band combination with at least one serving cells. Changes of (indicated) power capability of a wireless device (e.g., user equipment) from a first value to a second value and back are made at power capability reporting events, all transmissions preceding this event are according to the first capability, transmissions succeeding the event are according to the second capability. This does not prevent use of any power back-off like P-MPR. According to one aspect, a wireless device, WD, configured to communicate with a network node is provided. The wireless device is configured to transmit a power headroom report, PHR, to the network node in response to a power headroom, PH, reporting event. The WD is also configured to perform a power class change from a first power class value to a second power class value at a time instant associated with the PH reporting event. According to this aspect, in some embodiments, the WD is configured to apply the power class change to uplink transmissions subsequent to the time instant associated with the PH reporting event. In some embodiments, the time instant occurs within a preconfigured interval of time preceding or following the PH reporting event. In some embodiments, the preconfigured interval of time is within at most two time slots of the PH reporting event. In some embodiments, the time instant occurs at a time of the PH reporting event. In some embodiments, each of the first and second power class value corresponds to an activated serving cell. In some embodiments, each of the first and second power class value corresponds to at least one activated serving cell in a configured band combination for carrier aggregation or dual connectivity. In some embodiments, the PHR is configured for an activated serving cell. In some embodiments, the PHR is configured for at least one activated serving cell in a configured band combination for carrier aggregation or dual connectivity. In some embodiments, the power class change is associated with at least one of: specific absorption ratio, SAR, limits, maximum permissible exposure, MPE, limits, internal heat limitations, transmission duty cycle and radio resource control, RRC, reconfiguration of a band combination for carrier aggregation or dual connectivity. In some embodiments, the WD is configured to apply the power class change for a serving cell of a configured operating band before a radio resource control, RRC, reconfiguration. In some embodiments, the WD is configured to apply the power class change for at least one serving cell of a configured operating band combination for carrier aggregation or dual connectivity after a radio resource control, RRC, reconfiguration. In some embodiments, the PH reporting event is at least one of expiry of a prohibit timer and a change in path loss that exceeds a threshold for at least one path loss reference signal for an activated serving cell of a medium access control, MAC, entity of which a downlink bandwidth part, BWP, is dormant since a last transmission of a PHR in the MAC entity when the MAC entity has uplink, UL, resources for a new transmission; expiry of a periodic timer; configuration of a PH reporting functionality by upper layers; activation of the MAC entity with a configured uplink of which a BWP parameter is not set to a dormant BWP; activation of a secondary cell group, SCG; addition of a primary special cell, PSCell, unless the SCG is deactivated; expiry of a prohibit time when the MAC entity has UL resources for a new transmission and the following is true for an activated serving cell of any MAC entity with a configured uplink: UL resources are allocated for transmission or there is a physical uplink control channel, PUCCH, transmission on a cell, and a change in power backoff for the cell exceeds a second threshold since a last transmission of a PHR when the MAC entity had UL resources for PUCCH transmission on the cell; switching of an activated BWP from a dormant BWP to a non-dormant downlink BWP of a secondary cell, SCell of any MAC entity with a configured uplink: and mpe-reporting-FR2 is configured and mpe-ProhibitTimer is not running and at least one of the following true: a measured maximum power reduction, P- MPR, applied to meet an FR2 maximum permissible exposure, MPE requirement exceeds a mpe-threshold for at least one activated FR2 serving cell since a last PHR transmission in the MAC entity; and a measured maximum power reduction, P-MPR, applied to meet an FR2 maximum permissible exposure, MPE requirement exceeds a power change factor threshold for at least one activated FR2 serving cell since a last PHR transmission due to the measured P-MPR being not less than an mpr-threshold in the MAC entity. According to another aspect, a method in a wireless device, WD, configured to communicate with a network node is provided. The method includes transmitting a power headroom report, PHR, to the network node in response to a power headroom, PH, reporting event; and performing a power class change from a first power class value to a second power class value at a time instant associated with the PH reporting event. According to this aspect, in some embodiments, the method includes applying the power class change to uplink transmissions subsequent to the time instant associated with the PH reporting event. In some embodiments, the time instant occurs within a preconfigured interval of time preceding or following the PH reporting event. In some embodiments, the preconfigured interval of time within is at most two time slots of the PH reporting event. In some embodiments, the time instant occurs at a time of the PH reporting event. In some embodiments, each of the first and second power class value corresponds to an activated serving cell. within at most two time slots of the PH reporting event each of the first and second power class value corresponds to at least one activated serving cell in a configured band combination for carrier aggregation or dual connectivity. In some embodiments, the PHR is configured for an activated serving cell. In some embodiments, the PHR is configured for at least one activated serving cell in a configured band combination for carrier aggregation or dual connectivity. In some embodiments, the power class change is associated with at least one of: specific absorption ratio, SAR, limits, maximum permissible exposure, MPE, limits, internal heat limitations, transmission duty cycle and radio resource control, RRC, reconfiguration of a band combination for carrier aggregation or dual connectivity. In some embodiments, the method includes applying the power class change for a serving cell of a configured operating band before a radio resource control, RRC, reconfiguration. In some embodiments, the method includes applying the power class change for at least one serving cell of a configured operating band combination for carrier aggregation or dual connectivity after a radio resource control, RRC, reconfiguration. In some embodiments, the PH reporting event is at least one of: expiry of a prohibit timer and a change in path loss that exceeds a threshold for at least one path loss reference signal for an activated serving cell of a medium access control, MAC, entity of which a downlink bandwidth part, BWP, is dormant since a last transmission of a PHR in the MAC entity when the MAC entity has uplink, UL, resources for a new transmission; expiry of a periodic timer; configuration of a PH reporting functionality by upper layers; activation of the MAC entity with a configured uplink of which a BWP parameter is not set to a dormant BWP; activation of a secondary cell group, SCG; addition of a primary special cell, PSCell, unless the SCG is deactivated; expiry of a prohibit time when the MAC entity has UL resources for a new transmission and the following is true for an activated serving cell of any MAC entity with a configured uplink: UL resources are allocated for transmission or there is a physical uplink control channel, PUCCH, transmission on a cell, and a change in power backoff for the cell exceeds a second threshold since a last transmission of a PHR when the MAC entity had UL resources for PUCCH transmission on the cell; switching of an activated BWP from a dormant BWP to a non-dormant downlink BWP of a secondary cell, SCell of any MAC entity with a configured uplink: and mpe-reporting-FR2 is configured and mpe-ProhibitTimer is not running and at least one of the following true: a measured maximum power reduction, P-MPR, applied to meet an FR2 maximum permissible exposure, MPE requirement exceeds a mpe-threshold for at least one activated FR2 serving cell since a last PHR transmission in the MAC entity; and a measured maximum power reduction, P-MPR, applied to meet an FR2 maximum permissible exposure, MPE requirement exceeds a power change factor threshold for at least one activated FR2 serving cell since a last PHR transmission due to the measured P-MPR being not less than an mpr-threshold in the MAC entity. BRIEF DESCRIPTION OF THE DRAWINGS A more complete understanding of the present embodiments, and the attendant advantages and features thereof, will be more readily understood by reference to the following detailed description when considered in conjunction with the accompanying drawings wherein: FIG.1 is a schematic diagram of an example network architecture illustrating a communication system connected via an intermediate network to a host computer according to the principles in the present disclosure; FIG.2 is a block diagram of a host computer communicating via a network node with a wireless device over an at least partially wireless connection according to some embodiments of the present disclosure; FIG.3 is a flowchart illustrating example methods implemented in a communication system including a host computer, a network node and a wireless device for executing a client application at a wireless device according to some embodiments of the present disclosure; FIG.4 is a flowchart illustrating example methods implemented in a communication system including a host computer, a network node and a wireless device for receiving user data at a wireless device according to some embodiments of the present disclosure; FIG.5 is a flowchart illustrating example methods implemented in a communication system including a host computer, a network node and a wireless device for receiving user data from the wireless device at a host computer according to some embodiments of the present disclosure; FIG.6 is a flowchart illustrating example methods implemented in a communication system including a host computer, a network node and a wireless device for receiving user data at a host computer according to some embodiments of the present disclosure; FIG.7 is a flowchart of an example process in a network node according to some embodiments of the present disclosure; FIG.8 is a flowchart of an example process in a wireless device according to some embodiments of the present disclosure; FIG.9 is a flowchart of another example process in a wireless device according to some embodiments of the present disclosure; FIG.10 is a diagram of an example transition between P1 and P2 for a PHR reported by DCI; FIG.11 is a diagram of an example transition between P2 and P1 for a PHR reported by a configured grant; and FIG.12 is a diagram of an example of power class upon configuration of a band combination. DETAILED DESCRIPTION Before describing in detail example embodiments, it is noted that the embodiments reside primarily in combinations of apparatus components and processing steps related to changing of a power class at a wireless device. Accordingly, components have been represented where appropriate by conventional symbols in the drawings, showing only those specific details that are pertinent to understanding the embodiments so as not to obscure the disclosure with details that will be readily apparent to those of ordinary skill in the art having the benefit of the description herein. Like numbers refer to like elements throughout the description. As used herein, relational terms, such as “first” and “second,” “top” and “bottom,” and the like, may be used solely to distinguish one entity or element from another entity or element without necessarily requiring or implying any physical or logical relationship or order between such entities or elements. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the concepts described herein. As used herein, the singular forms “a”, “an” and “the” are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms “comprises,” “comprising,” “includes” and/or “including” when used herein, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof. In embodiments described herein, the joining term, “in communication with” and the like, may be used to indicate electrical or data communication, which may be accomplished by physical contact, induction, electromagnetic radiation, radio signaling, infrared signaling or optical signaling, for example. One having ordinary skill in the art will appreciate that multiple components may interoperate and modifications and variations are possible of achieving the electrical and data communication. In some embodiments described herein, the term “coupled,” “connected,” and the like, may be used herein to indicate a connection, although not necessarily directly, and may include wired and/or wireless connections. In some embodiments, the phrase "time instant" is used although the phrase "time instance" may be equally applicable. The term “network node” used herein may be any kind of network node comprised in a radio network which may further comprise any of base station (BS), radio base station, base transceiver station (BTS), base station controller (BSC), radio network controller (RNC), g Node B (gNB), evolved Node B (eNB or eNodeB), Node B, multi- standard radio (MSR) radio node such as MSR BS, multi-cell/multicast coordination entity (MCE), integrated access and backhaul (IAB) node, relay node, donor node controlling relay, radio access point (AP), transmission points, transmission nodes, Remote Radio Unit (RRU) Remote Radio Head (RRH), a core network node (e.g., mobile management entity (MME), self-organizing network (SON) node, a coordinating node, positioning node, MDT node, etc.), an external node (e.g., 3rd party node, a node external to the current network), nodes in distributed antenna system (DAS), a spectrum access system (SAS) node, an element management system (EMS), etc. The network node may also comprise test equipment. The term “radio node” used herein may be used to also denote a wireless device (WD) such as a wireless device (WD) or a radio network node. In some embodiments, the non-limiting terms wireless device (WD) or a user equipment (UE) are used interchangeably. The WD herein may be any type of wireless device capable of communicating with a network node or another WD over radio signals, such as wireless device (WD). The WD may also be a radio communication device, target device, device to device (D2D) WD, machine type WD or WD capable of machine to machine communication (M2M), low-cost and/or low-complexity WD, a sensor equipped with WD, Tablet, mobile terminals, smart phone, laptop embedded equipped (LEE), laptop mounted equipment (LME), USB dongles, Customer Premises Equipment (CPE), an Internet of Things (IoT) device, or a Narrowband IoT (NB-IOT) device, etc. Also, in some embodiments the generic term “radio network node” is used. It may be any kind of a radio network node which may comprise any of base station, radio base station, base transceiver station, base station controller, network controller, RNC, evolved Node B (eNB), Node B, gNB, Multi-cell/multicast Coordination Entity (MCE), IAB node, relay node, access point, radio access point, Remote Radio Unit (RRU) Remote Radio Head (RRH). Note that although terminology from one particular wireless system, such as, for example, 3GPP LTE and/or New Radio (NR), may be used in this disclosure, this should not be seen as limiting the scope of the disclosure to only the aforementioned system. Other wireless systems, including without limitation Wide Band Code Division Multiple Access (WCDMA), Worldwide Interoperability for Microwave Access (WiMax), Ultra Mobile Broadband (UMB) and Global System for Mobile Communications (GSM), may also benefit from exploiting the ideas covered within this disclosure. In some embodiments, the general description elements in the form of “one of A and B” corresponds to A or B. In some embodiments, at least one of A and B corresponds to A, B or AB, or to one or more of A and B. In some embodiments, at least one of A, B and C corresponds to one or more of A, B and C, and/or A, B, C or a combination thereof. Note further, that functions described herein as being performed by a wireless device or a network node may be distributed over a plurality of wireless devices and/or network nodes. In other words, it is contemplated that the functions of the network node and wireless device described herein are not limited to performance by a single physical device and, in fact, may be distributed among several physical devices. Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this disclosure belongs. It will be further understood that terms used herein should be interpreted as having a meaning that is consistent with their meaning in the context of this specification and the relevant art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein. Some embodiments provide changing of a power class at a wireless device. Referring now to the drawing figures, in which like elements are referred to by like reference numerals, there is shown in FIG.1 a schematic diagram of a communication system 10, according to an embodiment, such as a 3GPP-type cellular network that may support standards such as LTE and/or NR (5G), which comprises an access network 12, such as a radio access network, and a core network 14. The access network 12 comprises a plurality of network nodes 16a, 16b, 16c (referred to collectively as network nodes 16), such as NBs, eNBs, gNBs or other types of wireless access points, each defining a corresponding coverage area 18a, 18b, 18c (referred to collectively as coverage areas 18). Each network node 16a, 16b, 16c is connectable to the core network 14 over a wired or wireless connection 20. A first wireless device (WD) 22a located in coverage area 18a is configured to wirelessly connect to, or be paged by, the corresponding network node 16a. A second WD 22b in coverage area 18b is wirelessly connectable to the corresponding network node 16b. While a plurality of WDs 22a, 22b (collectively referred to as wireless devices 22) are illustrated in this example, the disclosed embodiments are equally applicable to a situation where a sole WD is in the coverage area or where a sole WD is connecting to the corresponding network node 16. Note that although only two WDs 22 and three network nodes 16 are shown for convenience, the communication system may include many more WDs 22 and network nodes 16. Also, it is contemplated that a WD 22 may be in simultaneous communication and/or configured to separately communicate with more than one network node 16 and more than one type of network node 16. For example, a WD 22 may have dual connectivity with a network node 16 that supports LTE and the same or a different network node 16 that supports NR. As an example, WD 22 may be in communication with an eNB for LTE/E-UTRAN and a gNB for NR/NG-RAN. The communication system 10 may itself be connected to a host computer 24, which may be embodied in the hardware and/or software of a standalone server, a cloud- implemented server, a distributed server or as processing resources in a server farm. The host computer 24 may be under the ownership or control of a service provider, or may be operated by the service provider or on behalf of the service provider. The connections 26, 28 between the communication system 10 and the host computer 24 may extend directly from the core network 14 to the host computer 24 or may extend via an optional intermediate network 30. The intermediate network 30 may be one of, or a combination of more than one of, a public, private or hosted network. The intermediate network 30, if any, may be a backbone network or the Internet. In some embodiments, the intermediate network 30 may comprise two or more sub-networks (not shown). The communication system of FIG.1 as a whole enables connectivity between one of the connected WDs 22a, 22b and the host computer 24. The connectivity may be described as an over-the-top (OTT) connection. The host computer 24 and the connected WDs 22a, 22b are configured to communicate data and/or signaling via the OTT connection, using the access network 12, the core network 14, any intermediate network 30 and possible further infrastructure (not shown) as intermediaries. The OTT connection may be transparent in the sense that at least some of the participating communication devices through which the OTT connection passes are unaware of routing of uplink and downlink communications. For example, a network node 16 may not or need not be informed about the past routing of an incoming downlink communication with data originating from a host computer 24 to be forwarded (e.g., handed over) to a connected WD 22a. Similarly, the network node 16 need not be aware of the future routing of an outgoing uplink communication originating from the WD 22a towards the host computer 24. A network node 16 is configured to include an indication unit 32 which is configured to perform one or more network node 16 functions as described herein such as with respect to changing of a power class at a wireless device 22. A wireless device 22 is configured to include a power headroom report (PHR) unit 34 which is configured to perform one or more wireless device 22 functions as described herein such as with respect to changing of a power class at a wireless device 22. The PHR unit 34 may be configured to perform a power class change from a first power class value to a second power class value at a time instant associated with the PH reporting event. The power class change may be applied to uplink transmission. Example implementations, in accordance with an embodiment, of the WD 22, network node 16 and host computer 24 discussed in the preceding paragraphs will now be described with reference to FIG.2. In a communication system 10, a host computer 24 comprises hardware (HW) 38 including a communication interface 40 configured to set up and maintain a wired or wireless connection with an interface of a different communication device of the communication system 10. The host computer 24 further comprises processing circuitry 42, which may have storage and/or processing capabilities. The processing circuitry 42 may include a processor 44 and memory 46. In particular, in addition to or instead of a processor, such as a central processing unit, and memory, the processing circuitry 42 may comprise integrated circuitry for processing and/or control, e.g., one or more processors and/or processor cores and/or FPGAs (Field Programmable Gate Array) and/or ASICs (Application Specific Integrated Circuitry) adapted to execute instructions. The processor 44 may be configured to access (e.g., write to and/or read from) memory 46, which may comprise any kind of volatile and/or nonvolatile memory, e.g., cache and/or buffer memory and/or RAM (Random Access Memory) and/or ROM (Read-Only Memory) and/or optical memory and/or EPROM (Erasable Programmable Read-Only Memory). Processing circuitry 42 may be configured to control any of the methods and/or processes described herein and/or to cause such methods, and/or processes to be performed, e.g., by host computer 24. Processor 44 corresponds to one or more processors 44 for performing host computer 24 functions described herein. The host computer 24 includes memory 46 that is configured to store data, programmatic software code and/or other information described herein. In some embodiments, the software 48 and/or the host application 50 may include instructions that, when executed by the processor 44 and/or processing circuitry 42, causes the processor 44 and/or processing circuitry 42 to perform the processes described herein with respect to host computer 24. The instructions may be software associated with the host computer 24. The software 48 may be executable by the processing circuitry 42. The software 48 includes a host application 50. The host application 50 may be operable to provide a service to a remote user, such as a WD 22 connecting via an OTT connection 52 terminating at the WD 22 and the host computer 24. In providing the service to the remote user, the host application 50 may provide user data which is transmitted using the OTT connection 52. The “user data” may be data and information described herein as implementing the described functionality. In one embodiment, the host computer 24 may be configured for providing control and functionality to a service provider and may be operated by the service provider or on behalf of the service provider. The processing circuitry 42 of the host computer 24 may enable the host computer 24 to observe, monitor, control, transmit to and/or receive from the network node 16 and or the wireless device 22. The processing circuitry 42 of the host computer 24 may include an information unit 54 configured to enable the service provider to store, analyze, forward, relay, transmit, receiving, determine, etc. information related to changing of a power class at a wireless device 22. The communication system 10 further includes a network node 16 provided in a communication system 10 and including hardware 58 enabling it to communicate with the host computer 24 and with the WD 22. The hardware 58 may include a communication interface 60 for setting up and maintaining a wired or wireless connection with an interface of a different communication device of the communication system 10, as well as a radio interface 62 for setting up and maintaining at least a wireless connection 64 with a WD 22 located in a coverage area 18 served by the network node 16. The radio interface 62 may be formed as or may include, for example, one or more RF transmitters, one or more RF receivers, and/or one or more RF transceivers. The communication interface 60 may be configured to facilitate a connection 66 to the host computer 24. The connection 66 may be direct or it may pass through a core network 14 of the communication system 10 and/or through one or more intermediate networks 30 outside the communication system 10. In the embodiment shown, the hardware 58 of the network node 16 further includes processing circuitry 68. The processing circuitry 68 may include a processor 70 and a memory 72. In particular, in addition to or instead of a processor, such as a central processing unit, and memory, the processing circuitry 68 may comprise integrated circuitry for processing and/or control, e.g., one or more processors and/or processor cores and/or FPGAs (Field Programmable Gate Array) and/or ASICs (Application Specific Integrated Circuitry) adapted to execute instructions. The processor 70 may be configured to access (e.g., write to and/or read from) the memory 72, which may comprise any kind of volatile and/or nonvolatile memory, e.g., cache and/or buffer memory and/or RAM (Random Access Memory) and/or ROM (Read-Only Memory) and/or optical memory and/or EPROM (Erasable Programmable Read-Only Memory). Thus, the network node 16 further has software 74 stored internally in, for example, memory 72, or stored in external memory (e.g., database, storage array, network storage device, etc.) accessible by the network node 16 via an external connection. The software 74 may be executable by the processing circuitry 68. The processing circuitry 68 may be configured to control any of the methods and/or processes described herein and/or to cause such methods, and/or processes to be performed, e.g., by network node 16. Processor 70 corresponds to one or more processors 70 for performing network node 16 functions described herein. The memory 72 is configured to store data, programmatic software code and/or other information described herein. In some embodiments, the software 74 may include instructions that, when executed by the processor 70 and/or processing circuitry 68, causes the processor 70 and/or processing circuitry 68 to perform the processes described herein with respect to network node 16. For example, processing circuitry 68 of the network node 16 may include an indication unit 32 configured to perform one or more network node 16 functions as described herein such as with respect to changing of a power class at a wireless device. The communication system 10 further includes the WD 22 already referred to. The WD 22 may have hardware 80 that may include a radio interface 82 configured to set up and maintain a wireless connection 64 with a network node 16 serving a coverage area 18 in which the WD 22 is currently located. The radio interface 82 may be formed as or may include, for example, one or more RF transmitters, one or more RF receivers, and/or one or more RF transceivers. The hardware 80 of the WD 22 further includes processing circuitry 84. The processing circuitry 84 may include a processor 86 and memory 88. In particular, in addition to or instead of a processor, such as a central processing unit, and memory, the processing circuitry 84 may comprise integrated circuitry for processing and/or control, e.g., one or more processors and/or processor cores and/or FPGAs (Field Programmable Gate Array) and/or ASICs (Application Specific Integrated Circuitry) adapted to execute instructions. The processor 86 may be configured to access (e.g., write to and/or read from) memory 88, which may comprise any kind of volatile and/or nonvolatile memory, e.g., cache and/or buffer memory and/or RAM (Random Access Memory) and/or ROM (Read-Only Memory) and/or optical memory and/or EPROM (Erasable Programmable Read-Only Memory). Thus, the WD 22 may further comprise software 90, which is stored in, for example, memory 88 at the WD 22, or stored in external memory (e.g., database, storage array, network storage device, etc.) accessible by the WD 22. The software 90 may be executable by the processing circuitry 84. The software 90 may include a client application 92. The client application 92 may be operable to provide a service to a human or non-human user via the WD 22, with the support of the host computer 24. In the host computer 24, an executing host application 50 may communicate with the executing client application 92 via the OTT connection 52 terminating at the WD 22 and the host computer 24. In providing the service to the user, the client application 92 may receive request data from the host application 50 and provide user data in response to the request data. The OTT connection 52 may transfer both the request data and the user data. The client application 92 may interact with the user to generate the user data that it provides. The processing circuitry 84 may be configured to control any of the methods and/or processes described herein and/or to cause such methods, and/or processes to be performed, e.g., by WD 22. The processor 86 corresponds to one or more processors 86 for performing WD 22 functions described herein. The WD 22 includes memory 88 that is configured to store data, programmatic software code and/or other information described herein. In some embodiments, the software 90 and/or the client application 92 may include instructions that, when executed by the processor 86 and/or processing circuitry 84, causes the processor 86 and/or processing circuitry 84 to perform the processes described herein with respect to WD 22. For example, the processing circuitry 84 of the wireless device 22 may include a PHR unit 34 configured to perform one or more wireless device 22 functions as described herein such as with respect to changing of a power class at a wireless device 22. The PHR unit 34 may be configured to perform a power class change from a first power class value to a second power class value at a time instant associated with the PH reporting event. In some embodiments, the inner workings of the network node 16, WD 22, and host computer 24 may be as shown in FIG.2 and independently, the surrounding network topology may be that of FIG.1. In FIG.2, the OTT connection 52 has been drawn abstractly to illustrate the communication between the host computer 24 and the wireless device 22 via the network node 16, without explicit reference to any intermediary devices and the precise routing of messages via these devices. Network infrastructure may determine the routing, which it may be configured to hide from the WD 22 or from the service provider operating the host computer 24, or both. While the OTT connection 52 is active, the network infrastructure may further take decisions by which it dynamically changes the routing (e.g., on the basis of load balancing consideration or reconfiguration of the network). The wireless connection 64 between the WD 22 and the network node 16 is in accordance with the teachings of the embodiments described throughout this disclosure. One or more of the various embodiments improve the performance of OTT services provided to the WD 22 using the OTT connection 52, in which the wireless connection 64 may form the last segment. More precisely, the teachings of some of these embodiments may improve the data rate, latency, and/or power consumption and thereby provide benefits such as reduced user waiting time, relaxed restriction on file size, better responsiveness, extended battery lifetime, etc. In some embodiments, a measurement procedure may be provided for the purpose of monitoring data rate, latency and other factors on which the one or more embodiments improve. There may further be an optional network functionality for reconfiguring the OTT connection 52 between the host computer 24 and WD 22, in response to variations in the measurement results. The measurement procedure and/or the network functionality for reconfiguring the OTT connection 52 may be implemented in the software 48 of the host computer 24 or in the software 90 of the WD 22, or both. In embodiments, sensors (not shown) may be deployed in or in association with communication devices through which the OTT connection 52 passes; the sensors may participate in the measurement procedure by supplying values of the monitored quantities exemplified above, or supplying values of other physical quantities from which software 48, 90 may compute or estimate the monitored quantities. The reconfiguring of the OTT connection 52 may include message format, retransmission settings, preferred routing etc.; the reconfiguring need not affect the network node 16, and it may be unknown or imperceptible to the network node 16. Some such procedures and functionalities may be known and practiced in the art. In certain embodiments, measurements may involve proprietary WD signaling facilitating the host computer’s 24 measurements of throughput, propagation times, latency and the like. In some embodiments, the measurements may be implemented in that the software 48, 90 causes messages to be transmitted, in particular empty or ‘dummy’ messages, using the OTT connection 52 while it monitors propagation times, errors, etc. Thus, in some embodiments, the host computer 24 includes processing circuitry 42 configured to provide user data and a communication interface 40 that is configured to forward the user data to a cellular network for transmission to the WD 22. In some embodiments, the cellular network also includes the network node 16 with a radio interface 62. In some embodiments, the network node 16 is configured to, and/or the network node’s 16 processing circuitry 68 is configured to perform the functions and/or methods described herein for preparing/initiating/maintaining/ supporting/ending a transmission to the WD 22, and/or preparing/terminating/ maintaining/supporting/ending in receipt of a transmission from the WD 22. In some embodiments, the host computer 24 includes processing circuitry 42 and a communication interface 40 that is configured to a communication interface 40 configured to receive user data originating from a transmission from a WD 22 to a network node 16. In some embodiments, the WD 22 is configured to, and/or comprises a radio interface 82 and/or processing circuitry 84 configured to perform the functions and/or methods described herein for preparing/initiating/maintaining/ supporting/ending a transmission to the network node 16, and/or preparing/ terminating/maintaining/supporting/ending in receipt of a transmission from the network node 16. Although FIGS.1 and 2 show various “units” such as indication unit 32, and PHR unit 34 as being within a respective processor, it is contemplated that these units may be implemented such that a portion of the unit is stored in a corresponding memory within the processing circuitry. In other words, the units may be implemented in hardware or in a combination of hardware and software within the processing circuitry. FIG.3 is a flowchart illustrating an example method implemented in a communication system, such as, for example, the communication system of FIGS.1 and 2, in accordance with one embodiment. The communication system may include a host computer 24, a network node 16 and a WD 22, which may be those described with reference to FIG.2. In a first step of the method, the host computer 24 provides user data (Block S100). In an optional substep of the first step, the host computer 24 provides the user data by executing a host application, such as, for example, the host application 50 (Block S102). In a second step, the host computer 24 initiates a transmission carrying the user data to the WD 22 (Block S104). In an optional third step, the network node 16 transmits to the WD 22 the user data which was carried in the transmission that the host computer 24 initiated, in accordance with the teachings of the embodiments described throughout this disclosure (Block S106). In an optional fourth step, the WD 22 executes a client application, such as, for example, the client application 92, associated with the host application 50 executed by the host computer 24 (Block S108). FIG.4 is a flowchart illustrating an example method implemented in a communication system, such as, for example, the communication system of FIG.1, in accordance with one embodiment. The communication system may include a host computer 24, a network node 16 and a WD 22, which may be those described with reference to FIGS.1 and 2. In a first step of the method, the host computer 24 provides user data (Block S110). In an optional substep (not shown) the host computer 24 provides the user data by executing a host application, such as, for example, the host application 50. In a second step, the host computer 24 initiates a transmission carrying the user data to the WD 22 (Block S112). The transmission may pass via the network node 16, in accordance with the teachings of the embodiments described throughout this disclosure. In an optional third step, the WD 22 receives the user data carried in the transmission (Block S114). FIG.5 is a flowchart illustrating an example method implemented in a communication system, such as, for example, the communication system of FIG.1, in accordance with one embodiment. The communication system may include a host computer 24, a network node 16 and a WD 22, which may be those described with reference to FIGS.1 and 2. In an optional first step of the method, the WD 22 receives input data provided by the host computer 24 (Block S116). In an optional substep of the first step, the WD 22 executes the client application 92, which provides the user data in reaction to the received input data provided by the host computer 24 (Block S118). Additionally or alternatively, in an optional second step, the WD 22 provides user data (Block S120). In an optional substep of the second step, the WD provides the user data by executing a client application, such as, for example, client application 92 (Block S122). In providing the user data, the executed client application 92 may further consider user input received from the user. Regardless of the specific manner in which the user data was provided, the WD 22 may initiate, in an optional third substep, transmission of the user data to the host computer 24 (Block S124). In a fourth step of the method, the host computer 24 receives the user data transmitted from the WD 22, in accordance with the teachings of the embodiments described throughout this disclosure (Block S126). FIG.6 is a flowchart illustrating an example method implemented in a communication system, such as, for example, the communication system of FIG.1, in accordance with one embodiment. The communication system may include a host computer 24, a network node 16 and a WD 22, which may be those described with reference to FIGS.1 and 2. In an optional first step of the method, in accordance with the teachings of the embodiments described throughout this disclosure, the network node 16 receives user data from the WD 22 (Block S128). In an optional second step, the network node 16 initiates transmission of the received user data to the host computer 24 (Block S130). In a third step, the host computer 24 receives the user data carried in the transmission initiated by the network node 16 (Block S132). FIG.7 is a flowchart of an example process in a network node 16 according to some embodiments of the present disclosure. One or more blocks described herein may be performed by one or more elements of network node 16 such as by one or more of processing circuitry 68 (including the indication unit 32), processor 70, radio interface 62 and/or communication interface 60. Network node 16 is configured to receive (Block S134) a power headroom report, PHR, indicating a PHR reporting event associated with a first time instant, as described herein. Network node 16 is configured to indicate (Block S136) a change of a power class of the wireless device 22 from a first value to a second value at the time instant associated with the PHR reporting event, as described herein. According to one or more embodiments, the processing circuitry 68 is further configured to: receive a first uplink transmission and a second uplink transmission from the wireless device 22 where the first uplink transmission precedes the first time instant associated with the PHR reporting event and is in accordance with the first value of the power class, and where the second uplink transmission succeeds (or occurs after or occurs immediately after) the first time instant associated with the PHR reporting event and in accordance with the second value of the power class. According to one or more embodiments, the first time instant associated with the PHR reporting event one of: occurs at the time of the PHR reporting event; and occurs before or after the PHR reporting event within a time interval, the time interval being a predetermined length of time. According to one or more embodiments, the power class values correspond to one of: power class values activated serving cell of an operating band; and power class values of at least one activated serving cells in a configured band combination for carrier aggregation, CA, or dual connectivity, DC. FIG.8 is a flowchart of an example process in a wireless device 22 according to some embodiments of the present disclosure. One or more blocks described herein may be performed by one or more elements of wireless device 22 such as by one or more of processing circuitry 84 (including the PHR unit 34), processor 86, radio interface 82 and/or communication interface 60. Wireless device 22 is configured to determine (Block S138) a power headroom report, PHR, indicating a PHR reporting event associated with a first time instant, as described herein. Wireless device 22 is configured to cause (Block S140) transmission of the PHR to the network node 16, as described herein. In some embodiments, the wireless device 22 is configured to receive (Block S142) an indication of a change of a power class of the wireless device 22 from a first value to a second value at the time instant associated with the PHR reporting event, the indication being based on the PHR, as described herein. According to one or more embodiments, the processing circuitry 84 is further configured to: cause transmission of a first uplink transmission and a second uplink transmission where the first uplink transmission precedes the first time instant associated with the PHR reporting event and is in accordance with the first value of the power class, where the second uplink transmission succeeds (or occurs after or immediately after) the first time instant associated with the PHR reporting event and is in accordance with the second value of the power class. According to one or more embodiments, the first time instant associated with the PHR reporting event one of: occurs at the time of the PHR reporting event; and occurs before or after the PHR reporting event within a time interval, the time interval being a predetermined length of time. According to one or more embodiments, the power class values correspond to one of: power class values activated serving cell of an operating band; and power class values of at least one activated serving cells in a configured band combination for carrier aggregation, CA, or dual connectivity, DC. FIG.9 is a flowchart of an example process in a wireless device 22 according to some embodiments of the present disclosure. One or more blocks described herein may be performed by one or more elements of wireless device 22 such as by one or more of processing circuitry 84 (including the PHR unit 34), processor 86, radio interface 82 and/or communication interface 60. Wireless device 22 is configured to transmit (Block S144) a power headroom report, PHR, to the network node in response to a power headroom, PH, reporting event. The process also includes performing (Block S146) a power class change from a first power class value to a second power class value at a time instant associated with the PH reporting event. In some embodiments, the method includes applying the power class change to uplink transmissions subsequent to the time instant associated with the PH reporting event. In some embodiments, the time instant occurs within a preconfigured interval of time preceding or following the PH reporting event. In some embodiments, the preconfigured interval of time within is at most two time slots of the PH reporting event. In some embodiments, the time instant occurs at a time of the PH reporting event. In some embodiments, each of the first and second power class value corresponds to an activated serving cell. within at most two time slots of the PH reporting event each of the first and second power class value corresponds to at least one activated serving cell in a configured band combination for carrier aggregation or dual connectivity. In some embodiments, the PHR is configured for an activated serving cell. In some embodiments, the PHR is configured for at least one activated serving cell in a configured band combination for carrier aggregation or dual connectivity. In some embodiments, the power class change is associated with at least one of: specific absorption ratio, SAR, limits, maximum permissible exposure, MPE, limits, internal heat limitations, transmission duty cycle and radio resource control, RRC, reconfiguration of a band combination for carrier aggregation or dual connectivity. In some embodiments, the method includes applying the power class change for a serving cell of a configured operating band before a radio resource control, RRC, reconfiguration. In some embodiments, the method includes applying the power class change for at least one serving cell of a configured operating band combination for carrier aggregation or dual connectivity after a radio resource control, RRC, reconfiguration. In some embodiments, the PH reporting event is at least one of: expiry of a prohibit timer and a change in path loss that exceeds a threshold for at least one path loss reference signal for an activated serving cell of a medium access control, MAC, entity of which a downlink bandwidth part, BWP, is dormant since a last transmission of a PHR in the MAC entity when the MAC entity has uplink, UL, resources for a new transmission; expiry of a periodic timer; configuration of a PH reporting functionality by upper layers; activation of the MAC entity with a configured uplink of which a BWP parameter is not set to a dormant BWP; activation of a secondary cell group, SCG; addition of a primary special cell, PSCell, unless the SCG is deactivated; expiry of a prohibit time when the MAC entity has UL resources for a new transmission and the following is true for an activated serving cell of any MAC entity with a configured uplink: UL resources are allocated for transmission or there is a physical uplink control channel, PUCCH, transmission on a cell, and a change in power backoff for the cell exceeds a second threshold since a last transmission of a PHR when the MAC entity had UL resources for PUCCH transmission on the cell; switching of an activated BWP from a dormant BWP to a non-dormant downlink BWP of a secondary cell, SCell of any MAC entity with a configured uplink: and mpe-reporting-FR2 is configured and mpe-ProhibitTimer is not running and at least one of the following true: a measured maximum power reduction, P- MPR, applied to meet an FR2 maximum permissible exposure, MPE requirement exceeds a mpe-threshold for at least one activated FR2 serving cell since a last PHR transmission in the MAC entity; and a measured maximum power reduction, P-MPR, applied to meet an FR2 maximum permissible exposure, MPE requirement exceeds a power change factor threshold for at least one activated FR2 serving cell since a last PHR transmission due to the measured P-MPR being not less than an mpr-threshold in the MAC entity. Having described the general process flow of arrangements of the disclosure and having provided examples of hardware and software arrangements for implementing the processes and functions of the disclosure, the sections below provide details and examples of arrangements for changing of a power class at a wireless device 22. Some embodiments provide changing of a power class at a wireless device 22. A wireless device 22 is connected to a network node 16. The network node 16 is allocating transmission resources to the wireless device 22 determined by reported capabilities from the wireless device 22 including power capability (power class) and power headroom reports. The network node 16 may also use other complementary means for allocating resources such as measurements of uplink transmission quality from the wireless device 22. For wireless devices 22 capable of higher power capabilities such that exposure limits are exceeded in case the uplink duty cycle exceeds a threshold (≤ 1) specified or implementation specific, the wireless device 22 changes its power capability from P1 to P2 < P1 affecting the determination of the configured maximum output power and thus the reported power headroom (PHR). Example: for LTE and NR P1 is a higher power class (PC226 dBm) and P2 the default (PC323 dBm), the duty cycle threshold is 0.5 specified for TDD bands above which the wireless device 22 applies ∆^^^^^^^^^^^ = P1 - P2 = 3 dB with P1 and P2 in logarithmic scale. The wireless device 22 includes a first power class P1 as part of capability reporting for an uplink serving cell. The wireless device 22 falls back to a second power class P2 < P1 if SAR or MPE limits or wireless device 22 internal heat limitations cannot be fulfilled by the wireless device 22. The condition for this fallback is either specified (uplink transmission duty cycle) or based on wireless device 22 implementation. When the duty cycle is decreased below the threshold or conditions are such that SAR limits may be fulfilled, the wireless device 22 restores the first power class P1. Both P1 and P2 affect the configured output maximum output power the ^^^^^,^,^. When PHR is configured for an uplink serving cell, transitions between P1 and P2 occur after PHR triggering at the transmission occasion when the PHR is transmitted and included in the uplink transmission for PHR is reported by a grant on the DCI or by configured grant and periodic/semi-persistent SRS transmissions. FIG.10 is a diagram of an example transition from P1 to P2 when the PHR is reported using the resources on a UL grant received and indicated by a downlink control information DCI (PDCCH). The transition between P1 to P2 is made associated with an event, which is in this embodiment the PHR reporting/transmission occasion. The transition at the PHR reporting/transmission occasion occurs before (as shown by the dotted line) a wireless device 22 implementation-specific transition that may occur T_PHR later according to current NR specifications. Since the transition occurs associated with the event in the embodiment, the network node 16 may measure the PUSCH to determine the effect of ^^^^^^^^^^^^ on the transmitted power, and to take this into account in its scheduling. This embodiment also enables the wireless device 22 to save the power consumption during the T_PHR time. However, if the wireless device 22 changes ^^^^^^^^^^^^ after T_PHR, which is unknown to the network node 16, it may be difficult for the network node 16 to have accurate measurements of wireless device 22 power that are adjusted by ^^^^^^^^^^^^. FIG.11 is a diagram of an example transition from P2 to P1 when the PHR is reported using the resources on a configured UL grant. The transition between P1 to P2 is made associated with an event, which is in this embodiment the PHR reporting/transmission occasion. The transition at the PHR reporting/transmission occasion occurs later (the dotted line) than a wireless device 22 implementation-specific transition according to the current NR specifications, and that would have occurred T_PHR earlier. This embodiment enables the wireless device 22 to save the power consumption during the T_PHR time. This embodiment also enables the network node 16 to be aware of when the switch between P2 and P1 is made, and so shares the benefit described above where the network may have accurate measurements of wireless device 22 power that are adjusted by ^^^^^^^^^^^^. In some embodiments, the wireless device 22 switches between P1 and P2 at a time that is no later than ^^^^^ either before or after the PHR reporting/transmission occasion, where ^^^^^ is a predetermined length of time. Such embodiments may be beneficial to allow some flexibility to wireless device 22 to adjust ^^^^^^^^^^^^ according to their implementation, but still allow the network node 16 to have a time at which it knows a change in ^^^^^^^^^^^^ should be applied to uplink transmissions, and therefore to make measurements of wireless device 22 power that are adjusted by ^^^^^^^^^^^^. The predetermined length of time for ^^^^^ may be wireless device 22 specific depending on the wireless device 22 implementation for some transit time needed but may not exceed the time difference between triggering the PHR and the actual PHR transmission. In practice, it may be a numbers of slots before or after the PHR reporting/transmission occasion/event. For example, it may be 1 slot which means +- 1 slot of the PHR transmission slot. In another example, it may be 2 slots. In another example, it may be either +1 or -2 slots in either before or after the PHR transmission slot. There may be a plurality of maximum power capabilities for a serving cell in an operating band, P0, P1, … Pn; transitions between these operating bands also occur when PHR is transmitted and when PHR is configured on the serving cell. When the wireless device 22 is configured with more than one uplink serving cell, and a change of the power class for the band combination ^^^^^^^^^^^,^^ by ∆^^^^^^^^^^^,^^ triggers a change ∆^^^^^^^^^^^ = P1 – P2 of the band capability for a serving cell, the ∆^^^^^^^^^^^ for the serving cell is applied to uplink transmissions at the PHR reporting event of the serving cells (multi-entry PHR). Example: if ^^^^^^^^^^^,^^ = ^^^^^^^^^^^ = P1 and ∆^^^^^^^^^^^,^^ = P1 – P2 for the band combination, then ∆^^^^^^^^^^^ = P1 – P2 applied when the PHR is reported. MPE or SAR compliance is not affected by the T_PHR since the transmission time scale (in the order of ms) is much shorter than that used for measuring SAR (in the order of 30 seconds) and MPE (2-4 s above 10 GHz). Transitions between P1 and P2 not for the purpose of SAR/MPE compliance or wireless device 22 internal heat management does not have to coincide with PHR reporting: transitions between P1 and P2 (change of ∆^^^^^^^^^^^) for the purpose of SRS transmissions used for antenna switching with wireless devices 22 supporting transmission diversity do not have to coincide with PHR reports but occurs at the actual SRS transmission occasion as specified in 3GPP standards such as in, for example, 3GPP TS 38.101-1 v17.6.02022-06. FIG.12 is a diagram of another example of a power class change upon a RRC reconfiguration of a band combination for CA or DC, e.g., Pcell supports P1 for non-CA but P2 for CA (even if non-CA in the UL). Some Non-Limiting Examples Note: The texts with italics indicate the implementation steps. Example 1: A method of managing power class change, at a wireless device 22 capable of communicating to the network node 16 with more than one power class, wherein the wireless device 22 is operated in one or more than one serving cells, comprising: - Triggering a Power Headroom Reporting (PHR) - Reporting the PHR - Changing power class of the wireless device 22 from a first value to a second value at a time instant associated with the PHR reporting event, the method further comprising: o all UL transmissions preceding the time instant associated with the PHR reporting event are according to the first value of the power class; and o all UL transmissions succeeding the time instant associated with the PHR reporting event are according to the second value of the power class. Example 2: A method according to Example 1, wherein the time instant associated with the PHR reporting event comprises one of the following: - the time instant occurs at the time of the PHR reporting event - the time instant occurs before or after the PHR reporting event within a time interval, wherein the time interval comprises a predetermined length of time. Example 3: A method according to Example 1, wherein the reporting PHR comprises one of the following: - the PHR is transmitted by a PUSCH, o wherein the PUSCH is configured by a UL grant, received in DL DCI by the wireless device 22. - The PHR is transmitted by an SRS o wherein the SRS is configured by a configured grant, and/or o the SRS transmission is periodic or semi-persistent Example 4: A method according to at least one of Examples 1-3, changing power class of the wireless device 22 from a first value to a second value further comprising: - wherein the power class values correspond to one of the following: o One activated serving cell of an operating band o At least one activated serving cells in a configured band combination for CA or DC Example 5: A method according to Example 3, wherein the PHR is configured for one of the following: - One activated serving cell of an operating band - At least one activated serving cells in a configured band combination for CA or DC Example 6: A method according to at least one of Examples 1-5, changing power class of the wireless device 22 from a first value to a second value further associated with one or more than one of the following conditions: - SAR limits - MPE limits - UE internal heat limitation - UL transmission duty cycle - RRC reconfiguration of a band combination for CA or DC Example 7: A method according to Example 6, wherein the power class change is associated with a RRC reconfiguration of a band combination of CA or DC, further comprises: - The first power class value is applied for the serving cell of one configured operating band, before the RRC reconfiguration - The second power class value is applied for at least one of the serving cell of one configured band combination of CA or DC, after the RRC reconfiguration. Example 8: A wireless device 22 (e.g., UE) capable of communicating to the network node 16 with more than one power class, where the wireless device 22 is operated in one or more than one serving cells, comprising: - A module of managing power class change, includes: o Triggering a Power Headroom Reporting (PHR) o Reporting the PHR o Changing power class of the wireless device 22 from a first value to a second value at a time instant associated with the PHR reporting event, the method further comprising: ^ all UL transmissions preceding the time instant associated with the PHR reporting event are according to the first value of the power class; and ^ all UL transmissions succeeding the time instant associated with the PHR reporting event are according to the second value of the power class. One or more embodiments/examples described herein provide one or more of the following advantages: The network node 16 connected to the wireless device 22 allocates transmissions resources according to the reported power capability that is the same as the actual power capability. From a lower first power capability to a second higher power capability: reduced power consumption at the wireless device 22, the wireless device 22 applying a power capability in accordance to the last reported power capability to the network node 16. From a higher first power capability to a lower power capability: reduced risk of retransmissions since, the wireless device 22 does not apply a power capability lower than that last reported to -- and assumed for transmission resources by -- the network node 16. Can be performed without affecting MPE or SAR compliance since the transmission time scale (order of ms) is much shorter than that used for measuring SAR (order of 30 seconds) and MPE (2-4 s above 10 GHz). Some embodiments may include one or more of the following: Embodiment A1. A network node configured to communicate with a wireless device, the network node configured to, and/or comprising a radio interface and/or comprising processing circuitry configured to: receive a power headroom report, PHR, indicating a PHR reporting event associated with a first time instant; and indicate a change of a power class of the wireless device from a first value to a second value at the time instant associated with the PHR reporting event. Embodiment A2. The network node of Embodiment A1, wherein the processing circuitry is further configured to: receive a first uplink transmission and a second uplink transmission from the wireless device, the first uplink transmission preceding the first time instant associated with the PHR reporting event and being in accordance with the first value of the power class; and the second uplink transmission succeeding the first time instant associated with the PHR reporting event and in accordance with the second value of the power class. Embodiment A3. The network node of any one of Embodiments A1-A2, wherein the first time instant associated with the PHR reporting event one of: occurs at the time of the PHR reporting event; and occurs before or after the PHR reporting event within a time interval, the time interval being a predetermined length of time. Embodiment A4. The network node of any one of Embodiments A1-A3, wherein the power class values correspond to one of: power class values activated serving cell of an operating band; and power class values of at least one activated serving cells in a configured band combination for carrier aggregation, CA, or dual connectivity, DC. Embodiment B1. A method implemented in a network node that is configured to communicate with a wireless device, the method comprising: receiving a power headroom report, PHR, indicating a PHR reporting event associated with a first time instant; and indicating a change of a power class of the wireless device from a first value to a second value at the time instant associated with the PHR reporting event. Embodiment B2. The method of Embodiment B1, further comprising: receiving a first uplink transmission and a second uplink transmission from the wireless device, the first uplink transmission preceding the first time instant associated with the PHR reporting event and being in accordance with the first value of the power class; and the second uplink transmission succeeding the first time instant associated with the PHR reporting event and in accordance with the second value of the power class. Embodiment B3. The method of any one of Embodiments B1-B2, wherein the first time instant associated with the PHR reporting event one of: occurs at the time of the PHR reporting event; and occurs before or after the PHR reporting event within a time interval, the time interval being a predetermined length of time. Embodiment B4. The method of any one of Embodiments B1-B3, wherein the power class values correspond to one of: power class values activated serving cell of an operating band; and power class values of at least one activated serving cells in a configured band combination for carrier aggregation, CA, or dual connectivity, DC. Embodiment C1. A wireless device configured to communicate with a network node, the wireless device configured to, and/or comprising a radio interface and/or processing circuitry configured to: determine a power headroom report, PHR, indicating a PHR reporting event associated with a first time instant; cause transmission of the PHR to the network node; and receive an indication of a change of a power class of the wireless device from a first value to a second value at the time instant associated with the PHR reporting event, the indication being based on the PHR. Embodiment C2. The wireless device of Embodiment C1, wherein the processing circuitry is further configured to: cause transmission of a first uplink transmission and a second uplink transmission, the first uplink transmission preceding the first time instant associated with the PHR reporting event and being in accordance with the first value of the power class; and the second uplink transmission succeeding the first time instant associated with the PHR reporting event and being in accordance with the second value of the power class. Embodiment C3. The wireless device of any one of Embodiments C1-C2, wherein the first time instant associated with the PHR reporting event one of: occurs at the time of the PHR reporting event; and occurs before or after the PHR reporting event within a time interval, the time interval being a predetermined length of time. Embodiment C4. The wireless device of any one of Embodiment C1-C3, wherein the power class values correspond to one of: power class values activated serving cell of an operating band; and power class values of at least one activated serving cells in a configured band combination for carrier aggregation, CA, or dual connectivity, DC. Embodiment D1. A method implemented in a wireless device that is configured to communicate with a network node, the method comprising: determining a power headroom report, PHR, indicating a PHR reporting event associated with a first time instant; causing transmission of the PHR to the network node; and receiving an indication of a change of a power class of the wireless device from a first value to a second value at the time instant associated with the PHR reporting event, the indication being based on the PHR. Embodiment D2. The method of Embodiment D1, further comprising: causing transmission of a first uplink transmission and a second uplink transmission, the first uplink transmission preceding the first time instant associated with the PHR reporting event and being in accordance with the first value of the power class; and the second uplink transmission succeeding the first time instant associated with the PHR reporting event and being in accordance with the second value of the power class. Embodiment D3. The method of any one of Embodiments D1-D2, wherein the first time instant associated with the PHR reporting event one of: occurs at the time of the PHR reporting event; and occurs before or after the PHR reporting event within a time interval, the time interval being a predetermined length of time. Embodiment D4. The method of any one of Embodiment D1-D3, wherein the power class values correspond to one of: power class values activated serving cell of an operating band; and power class values of at least one activated serving cells in a configured band combination for carrier aggregation, CA, or dual connectivity, DC. As will be appreciated by one of skill in the art, the concepts described herein may be embodied as a method, data processing system, computer program product and/or computer storage media storing an executable computer program. Accordingly, the concepts described herein may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects all generally referred to herein as a “circuit” or “module.” Any process, step, action and/or functionality described herein may be performed by, and/or associated to, a corresponding module, which may be implemented in software and/or firmware and/or hardware. Furthermore, the disclosure may take the form of a computer program product on a tangible computer usable storage medium having computer program code embodied in the medium that may be executed by a computer. Any suitable tangible computer readable medium may be utilized including hard disks, CD-ROMs, electronic storage devices, optical storage devices, or magnetic storage devices. Some embodiments are described herein with reference to flowchart illustrations and/or block diagrams of methods, systems and computer program products. It will be understood that each block of the flowchart illustrations and/or block diagrams, and combinations of blocks in the flowchart illustrations and/or block diagrams, may be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer (to thereby create a special purpose computer), special purpose computer, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions/acts specified in the flowchart and/or block diagram block or blocks. These computer program instructions may also be stored in a computer readable memory or storage medium that may direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer readable memory produce an article of manufacture including instruction means which implement the function/act specified in the flowchart and/or block diagram block or blocks. The computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions/acts specified in the flowchart and/or block diagram block or blocks. It is to be understood that the functions/acts noted in the blocks may occur out of the order noted in the operational illustrations. 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/acts involved. Although some of the diagrams include arrows on communication paths to show a primary direction of communication, it is to be understood that communication may occur in the opposite direction to the depicted arrows. Computer program code for carrying out operations of the concepts described herein may be written in an object oriented programming language such as Python, Java® or C++. However, the computer program code for carrying out operations of the disclosure may also be written in conventional procedural programming languages, such as the "C" programming language. The program code may execute entirely on the user's computer, partly on the user's computer, as a stand-alone software package, partly on the user's computer and partly on a remote computer or entirely on the remote computer. In the latter scenario, the remote computer may be connected to the user's computer through a local area network (LAN) or a wide area network (WAN), or the connection may be made to an external computer (for example, through the Internet using an Internet Service Provider). Many different embodiments have been disclosed herein, in connection with the above description and the drawings. It will be understood that it would be unduly repetitious and obfuscating to literally describe and illustrate every combination and subcombination of these embodiments. Accordingly, all embodiments may be combined in any way and/or combination, and the present specification, including the drawings, shall be construed to constitute a complete written description of all combinations and subcombinations of the embodiments described herein, and of the manner and process of making and using them, and shall support claims to any such combination or subcombination. It will be appreciated by persons skilled in the art that the embodiments described herein are not limited to what has been particularly shown and described herein above. In addition, unless mention was made above to the contrary, it should be noted that all of the accompanying drawings are not to scale. A variety of modifications and variations are possible in light of the above teachings without departing from the scope of the following claims.

Claims

Claims: 1. A wireless device, WD (22), configured to communicate with a network node (16), the wireless device (22) configured to: transmit a power headroom report, PHR, to the network node (16) in response to a power headroom, PH, reporting event; and perform a power class change from a first power class value to a second power class value at a time instant associated with the PH reporting event. 2. The WD (22) of Claim 1, wherein the WD (22) is configured to apply the power class change to uplink transmissions subsequent to the time instant associated with the PH reporting event. 3. The WD (22) of any of Claims 1 and 2, wherein the time instant occurs within a preconfigured interval of time preceding or following the PH reporting event. 4. The WD (22) of Claim 3 wherein the preconfigured interval of time is within at most two time slots of the PH reporting event. 5. The WD (22) of any of Claims 1-4, wherein the time instant occurs at a time of the PH reporting event. 6. The WD (22) of any of Claims 1-5, wherein each of the first and second power class value corresponds to an activated serving cell. 7. The WD (22) of any of Claims 1-5, wherein each of the first and second power class value corresponds to at least one activated serving cell in a configured band combination for carrier aggregation or dual connectivity. 8. The WD (22) of any of Claims 1-7, wherein the PHR is configured for an activated serving cell. 9. The WD (22) of any of Claims 1-7, wherein the PHR is configured for at least one activated serving cell in a configured band combination for carrier aggregation or dual connectivity. 10. The WD (22) of any of Claims 1-9, wherein power class change is associated with at least one of: specific absorption ratio, SAR, limits, maximum permissible exposure, MPE, limits, internal heat limitations, transmission duty cycle and radio resource control, RRC, reconfiguration of a band combination for carrier aggregation or dual connectivity. 11. The WD (22) of any of Claims 1-10, wherein the WD (22) is configured to apply the power class change for a serving cell of a configured operating band before a radio resource control, RRC, reconfiguration. 12. The WD (22) of any of Claims 1-10, wherein the WD (22) is configured to apply the power class change for at least one serving cell of a configured operating band combination for carrier aggregation or dual connectivity after a radio resource control, RRC, reconfiguration. 13. The WD (22) of any of Claims 1-12, wherein the PH reporting event is at least one of: expiry of a prohibit timer and a change in path loss that exceeds a threshold for at least one path loss reference signal for an activated serving cell of a medium access control, MAC, entity of which a downlink bandwidth part, BWP, is dormant since a last transmission of a PHR in the MAC entity when the MAC entity has uplink, UL, resources for a new transmission; expiry of a periodic timer; configuration of a PH reporting functionality by upper layers; activation of the MAC entity with a configured uplink of which a BWP parameter is not set to a dormant BWP; activation of a secondary cell group, SCG; addition of a primary special cell, PSCell, unless the SCG is deactivated; expiry of a prohibit time when the MAC entity has UL resources for a new transmission and the following is true for an activated serving cell of any MAC entity with a configured uplink: UL resources are allocated for transmission or there is a physical uplink control channel, PUCCH, transmission on a cell, and a change in power backoff for the cell exceeds a second threshold since a last transmission of a PHR when the MAC entity had UL resources for PUCCH transmission on the cell; switching of an activated BWP from a dormant BWP to a non-dormant downlink BWP of a secondary cell, SCell of any MAC entity with a configured uplink: and mpe-reporting-FR2 is configured and mpe-ProhibitTimer is not running and at least one of the following is true: a measured maximum power reduction, P-MPR, applied to meet an FR2 maximum permissible exposure, MPE requirement exceeds a mpe-threshold for at least one activated FR2 serving cell since a last PHR transmission in the MAC entity; and a measured maximum power reduction, P-MPR, applied to meet an FR2 maximum permissible exposure, MPE requirement exceeds a power change factor threshold for at least one activated FR2 serving cell since a last PHR transmission due to the measured P-MPR being not less than an mpr-threshold in the MAC entity. 14. A method in a wireless device, WD (22), configured to communicate with a network node (16), the method comprising: transmitting (S144) a power headroom report, PHR, to the network node (16) in response to a power headroom, PH, reporting event; and performing (S146) a power class change from a first power class value to a second power class value at a time instant associated with the PH reporting event. 15. The method of Claim 14, further comprising applying the power class change to uplink transmissions subsequent to the time instant associated with the PH reporting event. 16. The method of any of Claims 14 and 15, wherein the time instant occurs within a preconfigured interval of time preceding or following the PH reporting event. 17. The method of Claim 16 wherein the preconfigured interval of time is within at most two time slots of the PH reporting event. 18. The method of any of Claims 14-17, wherein the time instant occurs at a time of the PH reporting event. 19. The method of any of Claims 14-18, wherein each of the first and second power class value corresponds to an activated serving cell. 20. The method of any of Claims 14-18, wherein each of the first and second power class value corresponds to at least one activated serving cell in a configured band combination for carrier aggregation or dual connectivity. 21. The method of any of Claims 14-20, wherein the PHR is configured for an activated serving cell. 22. The method of any of Claims 14-20, wherein the PHR is configured for at least one activated serving cell in a configured band combination for carrier aggregation or dual connectivity. 23. The method of any of Claims 14-22, wherein the power class change is associated with at least one of: specific absorption ratio, SAR, limits, maximum permissible exposure, MPE, limits, internal heat limitations, transmission duty cycle and radio resource control, RRC, reconfiguration of a band combination for carrier aggregation or dual connectivity. 24. The method of any of Claims 14-23, further comprising applying the power class change for a serving cell of a configured operating band before a radio resource control, RRC, reconfiguration. 25. The method of any of Claims 14-23, further comprising applying the power class change for at least one serving cell of a configured operating band combination for carrier aggregation or dual connectivity after a radio resource control, RRC, reconfiguration. 26. The method of any of Claims 14-25, wherein the PH reporting event is at least one of: expiry of a prohibit timer and a change in path loss that exceeds a threshold for at least one path loss reference signal for an activated serving cell of a medium access control, MAC, entity of which a downlink bandwidth part, BWP, is dormant since a last transmission of a PHR in the MAC entity when the MAC entity has uplink, UL, resources for a new transmission; expiry of a periodic timer; configuration of a PH reporting functionality by upper layers; activation of the MAC entity with a configured uplink of which a BWP parameter is not set to a dormant BWP; activation of a secondary cell group, SCG; addition of a primary special cell, PSCell, unless the SCG is deactivated; expiry of a prohibit time when the MAC entity has UL resources for a new transmission and the following is true for an activated serving cell of any MAC entity with a configured uplink: UL resources are allocated for transmission or there is a physical uplink control channel, PUCCH, transmission on a cell, and a change in power backoff for the cell exceeds a second threshold since a last transmission of a PHR when the MAC entity had UL resources for PUCCH transmission on the cell; switching of an activated BWP from a dormant BWP to a non-dormant downlink BWP of a secondary cell, SCell of any MAC entity with a configured uplink: and mpe-reporting-FR2 is configured and mpe-ProhibitTimer is not running and at least one of the following is true: a measured maximum power reduction, P-MPR, applied to meet an FR2 maximum permissible exposure, MPE requirement exceeds a mpe-threshold for at least one activated FR2 serving cell since a last PHR transmission in the MAC entity; and a measured maximum power reduction, P-MPR, applied to meet an FR2 maximum permissible exposure, MPE requirement exceeds a power change factor threshold for at least one activated FR2 serving cell since a last PHR transmission due to the measured P-MPR being not less than an mpr-threshold in the MAC entity.
PCT/EP2023/078056 2022-10-10 2023-10-10 Wireless device changing power class at instant of reporting power headroom WO2024079123A1 (en)

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Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2021063071A1 (en) * 2019-09-30 2021-04-08 华为技术有限公司 Wireless communication method and apparatus

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2021063071A1 (en) * 2019-09-30 2021-04-08 华为技术有限公司 Wireless communication method and apparatus

Non-Patent Citations (12)

* Cited by examiner, † Cited by third party
Title
3GPP TECHNICAL SPECIFICATION (TS) 38.101-1
3GPP TECHNICAL STANDARD (TS) 38.101-1, June 2022 (2022-06-01)
3GPP TS 38.101-1
3GPP TS 38.101-1, June 2022 (2022-06-01)
3GPP TS 38.101-2
3GPP TS 38.101-3
3GPP TS 38.213, September 2022 (2022-09-01)
3GPP TS 38.214
3GPP TS 38.321, June 2022 (2022-06-01)
3GPP TS 38.331, June 2022 (2022-06-01)
3GPP TS38.101-2
SAMSUNG: "PHR trigger for P-MPR change", 3GPP DRAFT; R2-111891 PHR TIRGGER FOR P-MPR CHANGE, 3RD GENERATION PARTNERSHIP PROJECT (3GPP), MOBILE COMPETENCE CENTRE ; 650, ROUTE DES LUCIOLES ; F-06921 SOPHIA-ANTIPOLIS CEDEX ; FRANCE, vol. RAN WG2, no. Shanghai, China; 20110411, 5 April 2011 (2011-04-05), XP050494474 *

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