Patent Description:
Presently, user equipment, such as wireless communication devices, communicate with other communication devices using wireless signals, such as within a network environment that can include one or more cells within which various communication connections with the network and other devices operating within the network can be supported. Network environments often involve one or more sets of standards, which each define various aspects of any communication connection being made when using the corresponding standard within the network environment. Examples of developing and/or existing standards include new radio access technology (NR), Long Term Evolution (LTE), Universal Mobile Telecommunications Service (UMTS), Global System for Mobile Communication (GSM), and/or Enhanced Data GSM Environment (EDGE).

When the user equipment communicates with a particular access point associated with a particular cell, the distance between the user equipment and the access point can vary. The varying distance can affect the amount of attenuation that a signal may experience between the time that the signal is transmitted to the time that the signal is ultimately received. While at least one factor that can contribute to an amount of signal attenuation can be related to distance, it is possible that other factors, including environmental factors, may also impact the power level of a signal when the signal is received at its intended destination. Correspondingly, the relative power levels being used by the user equipment in communicating with the network via the access point using a wireless signal can be adjusted, as needed.

In some instances, there can be a delay in determining the desired power control adjustment state value, where often in a closed loop environment, through an iterative process, where the amount for the power to be adjusted at the signal's source can be updated until the desired power level is received at the signal's destination. As conditions between the transmitter and the receiver change, the amount of adjustment can be further updated to match the more recent operating conditions. In any event, there can be a delay associated with establishing an initial value related to identifying the desired amount of power adjustment, as well as a delay associated with any update to the previously determined power level to account for any changes in the operation of the transmitter relative to the intended receiver. Often times the delay associated with establishing an initial power level will be a longer than the time related with updating an already determined power level, depending upon the starting value selected as part of the iterative process.

In the event of a communication failure, such as a beam failure and a corresponding beam failure recovery, it can sometimes be necessary to establish a new initial power adjustment level value. However, the present inventors have recognized that in some instances, information related to the preceding connection prior to failure can be used to accelerate the arrival at the new initial determination of a power adjustment level related to the recovered connection, where better defining the circumstances in which prior information can be used to accelerate the determination of a new value for the power adjustment level may be beneficial.

R1-<NUM> is a 3GPP discussion document titled "Summary for Al <NUM>. <NUM> NR UL power control in non-CA aspects" submitted by ZTE at the TSG RAN WG1 Meeting #94bis in Chengdu, China, on <NUM> October <NUM>, and identifies and summarizes some issues related to non-CA aspects based on the submitted contributions ([<NUM>]~[<NUM>]) in RAN1 #94bis. R1-<NUM> is a 3GPP discussion document titled "Maintenance for UL power control" submitted by Motorola Mobility & Lenovo at TSG RAN WG1 Meeting #<NUM>-bis in Chengdu, China on <NUM> October <NUM>. R1-<NUM> is a 3GPP discussion document titled "Remaining Details on non-CA NR UL power control" submitted by Motorola Mobility & Lenovo at TSG RAN WG1 #<NUM> in Busan, Korea, on <NUM> May <NUM>, and describes refinements for NR UL power control.

Claim <NUM> defines a method for determining physical uplink channel power control parameter values for use after a beam failure recovery in a user equipment, and claim <NUM> defines a user equipment in a communication network. In the following, any method and/or apparatus referred to as embodiments but nevertheless do not fall within the scope of the appended claims are to be understood as examples helpful in understanding the invention.

These and other features, and advantages of the present application are evident from the following description of one or more preferred embodiments, with reference to the accompanying drawings.

Embodiments provide a method and apparatus for determining physical uplink channel power control parameter values for use after a beam failure recovery.

<FIG> is an example block diagram of a system <NUM> according to a possible embodiment. The system <NUM> can include a wireless communication device <NUM>, such as user equipment (UE), a base station <NUM>, such as an enhanced NodeB (eNB) or next generation NodeB (gNB), and a network <NUM>. The wireless communication device <NUM> can be a wireless terminal, a portable wireless communication device, a smartphone, a cellular telephone, a flip phone, a personal digital assistant, a personal computer, a selective call receiver, a tablet computer, a laptop computer, or any other device that is capable of sending and receiving communication signals on a wireless network.

The network <NUM> can include any type of network that is capable of sending and receiving wireless communication signals. For example, the network <NUM> can include a wireless communication network, a cellular telephone network, a Time Division Multiple Access (TDMA)-based network, a Code Division Multiple Access (CDMA)-based network, an Orthogonal Frequency Division Multiple Access (OFDMA)-based network, a Long Term Evolution (LTE) network, a 5th generation (<NUM>) network, a 3rd Generation Partnership Project (3GPP)-based network, a satellite communications network, a high altitude platform network, the Internet, and/or other communications networks.

Previously, a working assumption had been accepted, regarding a physical uplink control channel (PUCCH) spatial filter setting after a user equipment's (UE's) successful reception of a beam failure recovery (BFR) response from a network entity (e.g. gNodeB). Since the UE performs beam recovery procedure in the radio resource control (RRC) CONNECTED mode, UE-specifically configured higher layer (e.g. RRC) parameters including PUCCH and physical uplink shared channel (PUSCH) configurations are often still available. However, due to a serving beam change resulting from successful BFR, previously configured physical uplink control channel (PUCCH) and physical uplink shared channel (PUSCH) power control parameters (e.g. Po, alpha, a pathloss reference signal(s), closed-loop power control adjustment state(s)) associated with a previous serving beam(s), i.e. the previously activated 'PUCCH-SpatialRelationInfo' parameter and/or the previously configured parameter 'SRS-ResourceSet' (which is set to 'codebook' or 'nonCodebook') and corresponding power control parameter(s) 'SRI-PUSCH-PowerControl', may not be suitable for PUSCH/PUCCH transmissions after completion of BFR.

The working assumption that had been accepted, provides that a predetermined K symbols after successfully receiving BFR gNB response, the PUCCH transmissions shall use the same spatial filter as the physical random access channel (PRACH) transmission until the UE receives an activation or reconfiguration of spatial relation of corresponding PUCCH resource(s). It was noted that the latency of RRC or medium access control (MAC) control element (CE) configuration is included as part of the time duration for applying the same spatial filter as the PRACH transmission, and that the above applies for all bandwidth part(s) (BWP(s)) corresponding to the primary cell (PCell) or the primary secondary cell (PSCell). The value of K was identified for further study, as well as to whether to apply this for contention based random access (CBRA).

In accordance with the present disclosure, methods to determine PUCCH and PUSCH power control parameters after successful completion of beam failure recovery procedure are being proposed.

For PUCCH power control after successful BFR, the following solutions have been proposed, where for example, until the UE receives an activation or reconfiguration of spatial relation of PUCCH resource(s), and when a corresponding PUCCH transmission uses a same spatial filter as a PRACH transmission for BFR, the corresponding PUCCH transmission can use one or more of uplink (UL) power control parameters, as follows.

In connection with this existing proposal, the P0 value corresponding p0setindex=<NUM> of p0-pucch-set (i.e., q_u=<NUM>) is associated with one or more of previous serving beams, and may not be relevant to a newly selected beam during the BFR procedure. Similarly, the closed-loop power control process with index <NUM>, i.e. l=<NUM>, (or the lowest index) might have been associated with different beams from the newly selected serving beam during the BFR procedure, and the existing closed-loop power control adjustment state value may not be relevant to the newly selected serving beam.

According to 3rd Generation Partnership Project (3GPP) technical specification (TS) <NUM>, a UE-specific open-loop power control parameter PO_UE_PUCCH(qu) for PUCCH transmission is determined as follows:
PO_PUCCH,b,f,c(qu) is a parameter composed of the sum of a component PO_NOMINAL_PUCCH, provided by higher layer parameter p0-nominal for carrier f of primary cell c and, if provided, a component PO_UE_PUCCH(qu) provided by higher layer parameter p0-PUCCH-Value in P0-PUCCH for active uplink (UL) BWP b of carrier f of primary cell c, where <NUM> ≤ qu < Qu. Qu is a size for a set of PO_UE_PUCCH values provided by higher layer parameter maxNrofPUCCH-P0-PerSet. The set of PO_UE_PUCCH values is provided by higher layer parameter p0-Set. If higher layer parameter p0-Set is not provided to the UE, PO_UE_PUCCH(qu) = <NUM>, <NUM>≤qu <Qu.

In addition, according to 3GPP TS38. <NUM>, a closed-loop power control adjustment state for PUCCH is determined as follows:
For the PUCCH power control adjustment state gb,f,c(i,l) for active UL BWP b of carrier f of primary cell c and PUCCH transmission occasion i.

In other words, during a UE's initial cell selection procedure, a UE is not provided with the UE-specific open-loop PUCCH power control parameter 'p0-Set' and accordingly, the UE-specific open-loop PUCCH power control parameter PO_UE_PUCCH(qu) is set to be zero for PUCCH transmission. Furthermore, the UE maintains only one closed-loop PUCCH power control adjustment state.

According to a possible embodiment, after a UE initiates a beam failure recovery procedure by selecting a physical random access channel (PRACH) resource, transmitting a corresponding PRACH on the selected PRACH resource, and receiving a random access response message (for contention-based random access) or a BFR response message (for contention-free random access), the UE resets all configured PUCCH closed-loop power control adjustment states except a PUCCH closed-loop power control adjustment state of the 'closedLoopIndex' which is indicated by (or included in) a parameter 'PUCCH-SpatialRelationInfo', wherein the parameter 'PUCCH-SpatialRelationInfo' indicates and/or includes a downlink reference signal such as a synchronization signal/physical broadcast channel (SS/PBCH) block or a channel state information-reference signal (CSI-RS) resource that the UE selected for PRACH resource selection as a value for the parameter 'referenceSignal'. That is, the UE resets the closed-loop power control adjustment states which are not associated with a newly selected serving beam(s) corresponding to the selected downlink (DL) reference signal (RS) for PRACH resource selection. If the downlink reference signal selected for PRACH resource selection is included in one of the configured 'PUCCH-SpatialRelationInfo' parameters, the UE continues using the closed-loop power control adjustment state corresponding to the 'closedLoopIndex' in the corresponding 'PUCCH-SpatialRelationInfo' parameter. In one example, if the downlink reference signal selected for PRACH resource selection is included in one of the configured 'PUCCH-SpatialRelationInfo' parameters, the UE continues to use the closed-loop power control adjustment state corresponding to the 'closedLoopIndex' in the corresponding 'PUCCH-SpatialRelationInfo' parameter if the value of the closed-loop power control adjustment state is greater than a given value (e.g., zero, the given value may be higher layer configured), otherwise the UE resets the closed-loop power control adjustment state corresponding to the 'closedLoopIndex'.

According to another possible embodiment, during a contention-based random access (CBRA) procedure in an RRC connected mode (including a beam failure recovery procedure), a UE can determine PUCCH power control parameters for message <NUM> (Msg4) hybrid automatic re-transmission request (HARQ)-acknowledgement (ACK) feedback as follows:.

According to another possible embodiment, after successful completion of a beam failure recovery procedure (based on either contention-free or contention based random access) but before being re-configured with a new UE-specific configuration for the parameters 'PUCCH-PowerControl' and/or 'PUCCH-SpatialRelationInfo', a UE can determine PUCCH power control parameters as follows:.

According to further possible embodiments, if more than one 'PUCCH-SpatialRelationInfo' parameters include the DL RS selected for PRACH resource selection as a value of the parameter 'referenceSignal', the UE uses the power control parameters included in the 'PUCCH-SpatialRelationInfo' parameter with the lowest index 'pucch-SpatialRelationInfoId' among the 'PUCCH-SpatialRelationInfo' parameters that include the DL RS selected for PRACH resource selection. This scenario can occur if a network entity configures multiple sets of power control parameters for a given DL RS resource (i.e. a given DL beam) to support different service/traffic types, e.g. enhanced mobile broadband (eMBB) and ultra-reliable ultra-low latency communication (URLLC). For Msg4 HARQ-ACK feedback, the power control parameters do not have to optimized for a specific service (e.g. URLLC). Thus, the UE can use the default power control parameter set which is included in the 'PUCCH-SpatialRelationInfo' parameter with the lowest index 'pucch-SpatialRelationInfoId'.

According to yet another possible embodiment, if the UE uses a DL RS of another serving cell different than the current serving cell (where the UE initiates BFR or random access procedure) for PRACH resource selection, the UE determines that the DL RS selected for PRACH resource selection is included in a 'PUCCH-SpatialRelationInfo' parameter, when both the value of the 'ServCellIndex' parameter and the value of 'referenceSignal' match for the selected DL RS.

According to other possible embodiments, if the UE is in the connected mode with 'p0-Set' configuration but the parameter 'PUCCH-SpatialRelationInfo' is not provided (e.g. operation in frequency range below <NUM>), then UE's power control parameters do not have to be associated with a specific beam and accordingly, the UE can use open-loop power control parameters associated with the lowest index p0-PUCCH-Id'.

According to 3GPP TS <NUM>, for PUSCH scheduled by DCI format 0_0 on a cell, the UE shall transmit PUSCH according to the spatial relation, if applicable, corresponding to the PUCCH resource with the lowest identity (ID) within the active uplink (UL) bandwidth part (BWP) of the cell, and the PUSCH transmission is based on a single antenna port. A spatial setting for a PUCCH transmission is provided by higher layer parameter PUCCH-SpatialRelationInfo if the UE is configured with a single value for higher layer parameter pucch-SpatialRelationInfoId; otherwise, if the UE is provided multiple values for higher layer parameter PUCCH-SpatialRelationInfo, the UE determines a spatial setting for the PUCCH transmission based on a received PUCCH spatial relation activation/deactivation Medium Access Control (MAC) Control Element (CE) as described in 3GPP TS <NUM>. If PUSCH is scheduled by DCI format 0_1, the UE determines its PUSCH transmission precoder at least based on SRI (sounding reference signal resource indicator) given by the downlink control information (DCI) field of SRS resource indicator in Subclause <NUM>. <NUM> of 3GPP TS <NUM>.

According to 3GPP TS38. <NUM>, a UE-specific open-loop power control parameter PO_UE_PUSCH,f,c(<NUM>) for PUSCH transmission is determined, as follows:
If a UE is not provided higher layer parameter P0-PUSCH-AlphaSet or for a Msg3 PUSCH transmission as described in Subclause <NUM>, j = <NUM>, PO_UE_USCH,f,c(<NUM>) = <NUM>, and PO_NOMINAL_PUSCH,f,c(<NUM>) = PO_PRE + ΔPREAMBLE_Msg<NUM>, where the parameter preambleReceivedTargetPower [<NUM>, TS <NUM>] (for PO_PRE) and msg3-DeltaPreamble (for ΔPREAMBLE_Msg<NUM>) are provided by higher layers for carrier f of serving cell c.

That is, for PUSCH power control, a UE follows the mapping between SRI to a power control parameter set {j,k,l} (j: an index for open-loop power control parameters, k: an index of pathloss reference signal, l: an index for a closed-loop power control adjustment state). If SRI is not present in DCI or if the higher layer parameter 'SRI-PUSCHPowerControl' is not provided to the UE, the UE uses a default power control parameter set {j=<NUM>, k=<NUM>, l=<NUM>}, i.e. the value of the first higher layer parameter 'p0-Pusch-AlphaSet' in 'p0-AlphaSets'.

According to another possible embodiment, after successful completion of beam failure recovery procedure, a UE resets all configured PUSCH closed-loop power control adjustment states except a PUSCH closed-loop power control adjustment state of the 'closedLoopIndex' which is indicated by (or included in) a parameter 'SRI-PUSCHPowerControl', wherein the parameter 'SRI-PUSCHPowerControl' is associated with an SRS resource, where the SRS resource is associated with a DL RS selected for PRACH resource selection.

According to another possible embodiment, after successful completion of a BFR procedure but before being re-configured with a new UE-specific configuration for the parameters 'p0-AlphaSets' and/or 'SRI-PUSCHPowerControl', a UE can determine PUSCH power control parameters, as follows:.

According to another possible embodiment, after successful completion of a BFR procedure but before being re-configured with a new SRS resource set for PUSCH transmission, a UE shall use the same spatial filter as the PRACH transmission for PUSCH transmission until the UE receives an activation or reconfiguration of SRS resource set for PUSCH transmission, or reconfiguration of spatial relation of SRS resource set for PUSCH transmission.

<FIG> illustrates a flow diagram <NUM> in a user equipment for determining physical uplink channel power control parameter values for use after a beam failure recovery. The method includes transmitting <NUM> a physical random access channel with a spatial domain transmission filter associated with a selected downlink reference signal from a set of downlink reference signals configured for a link recovery. A determination <NUM> is made as to whether the selected downlink reference signal is configured for at least one of a set of uplink spatial relation configurations as a reference signal for an uplink spatial relation setting for a physical uplink channel transmission. A default power control parameter value for the physical uplink channel transmission is determined <NUM> in response to determining the selected downlink reference signal is not configured for any of the set of uplink spatial relation configurations until the user equipment receives an activation of an uplink spatial relation configuration or a reconfiguration of an uplink spatial relation configuration. A power control parameter value is determined <NUM> for the physical uplink channel transmission corresponding to the uplink spatial relation configuration with the selected downlink reference signal as the uplink spatial relation setting in response to determining the selected downlink reference signal is configured for at least one of the set of the uplink spatial relation configurations until the user equipment receives the activation of an uplink spatial relation configuration or the reconfiguration of an uplink spatial relation configuration. The physical uplink channel with the spatial domain transmission filter associated with the selected downlink reference signal and the determined physical uplink channel power control parameter value is then transmitted <NUM>.

In some instances, transmitting the physical uplink channel comprises transmitting the physical uplink channel with the same spatial domain transmission filter as that used for reception of the selected downlink reference signal.

In some instances, determining the default power control parameter value for the physical uplink channel transmission in response to determining the selected downlink reference signal is not configured for any of the set of uplink spatial relation configurations includes determining a value for a user equipment specific open loop physical uplink channel power control parameter. In some of these instances, as part of determining the default power control parameter value for the user equipment specific open loop physical uplink channel power control parameter includes setting the value of the user equipment specific open loop physical uplink channel power control parameter to zero and using a physical uplink channel closed loop power control adjustment state with a lowest index value.

In some instances, receiving the activation of the uplink spatial relation configuration includes receipt of the activation by higher layers, where the higher layers include a medium access control layer and the activation received in a medium access control - control element layer.

In some instances, receiving the reconfiguration of the uplink spatial relation configuration includes receiving the reconfiguration of a spatialRelationInfoToAddModList parameter configured by higher layers. In some of these instances, the higher layer includes at least one of a medium access control layer and a radio resource control layer.

In some instances, the physical uplink channel is a physical uplink shared channel, and each of a set of sounding reference signal resources is associated with one of the set of uplink spatial relation configurations and maps to an SRI-PUSCHPowerControl configuration.

In some instances, the physical uplink channel is a physical uplink control channel, and the set of uplink spatial relation configurations is a set of physical uplink control channel spatial relation info configurations.

In some instances, determining the power control parameter value for the physical uplink channel transmission in response to determining the selected downlink reference signal is configured for at least one of the set of uplink spatial relation configurations includes determining a value for a user equipment specific open loop physical uplink channel power control parameter corresponding to an uplink spatial relation configuration of the at least one of the set of uplink spatial relation configurations. In some of these instances, as part of determining the power control parameter value for the user equipment specific open loop physical uplink channel power control parameter includes determining a physical uplink channel closed loop power control adjustment state and a pathloss reference signal corresponding to the uplink spatial relation configuration of the at least one of the set of uplink spatial relation configurations. After transmitting the physical random access channel, and upon receiving a response message, in some instances, the user equipment can reset all configured physical uplink channel closed-loop power control adjustment states except for the determined physical uplink channel closed-loop power control adjustment state.

In some instances, the selected downlink reference signal includes a synchronization signal/physical broadcast channel block as a reference signal for the uplink spatial relation setting, and the selected downlink reference signal used by the user equipment for physical random access channel resource selection.

In some instances, the selected downlink reference signal includes a channel state information-reference signal as a reference signal for the uplink spatial relation setting, and the selected downlink reference signal used by the user equipment for physical random access channel resource selection.

In some instances, in response to determining the selected downlink reference signal is configured for more than one of the set of the uplink spatial relation configurations, the user equipment uses the values for the power control parameters included in the uplink spatial relation configuration with the lowest uplink spatial relation index. In some of these instances, the more than one of the set of uplink spatial relation configurations are respectively associated with different service/traffic types.

In some instances, the selected downlink reference signal is a reference signal of another serving cell different than a current serving cell used for physical random access channel resource selection, and determining whether the selected downlink reference signal is configured for at least one of a set of the uplink spatial relation configurations comprises determining whether both the value of a serving cell index and the selected downlink reference signal is configured for at least one of a set of uplink spatial relation configurations.

In some instances, during the link recovery while in a connected mode, if the user equipment is not configured with any of the at least one of a set of uplink spatial relation configurations, then the user equipment determines the default power control parameter value for a user equipment specific open loop physical uplink channel power control parameter as the parameter value associated with a lowest index of a set of user equipment specific open loop physical uplink channel power control parameter values.

<FIG> illustrates a flow diagram <NUM> in a network entity associated with the determination of a physical uplink channel power control parameter values for use in the user equipment. The method includes receiving <NUM> from a user equipment a physical random access channel transmitted with a spatial domain transmission filter associated with a selected downlink reference signal from a set of downlink reference signals configured for a link recovery. A physical uplink channel transmitted with the spatial domain transmission filter associated with the selected downlink reference signal and a determined physical uplink channel power control parameter value is received <NUM> from the user equipment. Whether the selected downlink reference signal is configured for at least one of a set of uplink spatial relation configurations as a reference signal for an uplink spatial relation setting for the physical uplink channel transmission is determined <NUM> by the user equipment. A default power control parameter value for the physical uplink channel transmission is determined <NUM> by the user equipment, in response to determining the selected downlink reference signal is not configured for any of the set of uplink spatial relation configurations, until the user equipment receives an activation of an uplink spatial relation configuration or a reconfiguration of an uplink spatial relation configuration. A power control parameter value for the physical uplink channel transmission corresponding to the uplink spatial relation configuration with the selected downlink reference signal as the uplink spatial relation setting is determined <NUM> by the user equipment, in response to determining the selected downlink reference signal is configured for at least one of the set of the uplink spatial relation configurations, until the user equipment receives the activation of an uplink spatial relation configuration or the reconfiguration of an uplink spatial relation configuration.

<FIG> is an example block diagram of an apparatus <NUM>, such as the wireless communication device <NUM>, according to a possible embodiment. The apparatus <NUM> can include a housing <NUM>, a controller <NUM> within the housing <NUM>, audio input and output circuitry <NUM> coupled to the controller <NUM>, a display <NUM> coupled to the controller <NUM>, a transceiver <NUM> coupled to the controller <NUM>, an antenna <NUM> coupled to the transceiver <NUM>, a user interface <NUM> coupled to the controller <NUM>, a memory <NUM> coupled to the controller <NUM>, and a network interface <NUM> coupled to the controller <NUM>. The apparatus <NUM> can perform the methods described in all the embodiments.

The display <NUM> can be a viewfinder, a liquid crystal display (LCD), a light emitting diode (LED) display, a plasma display, a projection display, a touch screen, or any other device that displays information. The transceiver <NUM> can include a transmitter and/or a receiver. The audio input and output circuitry <NUM> can include a microphone, a speaker, a transducer, or any other audio input and output circuitry. The user interface <NUM> can include a keypad, a keyboard, buttons, a touch pad, a joystick, a touch screen display, another additional display, or any other device useful for providing an interface between a user and an electronic device. The network interface <NUM> can be a Universal Serial Bus (USB) port, an Ethernet port, an infrared transmitter/receiver, an IEEE <NUM> port, a WLAN transceiver, or any other interface that can connect an apparatus to a network, device, or computer and that can transmit and receive data communication signals. The memory <NUM> can include a random access memory, a read only memory, an optical memory, a solid state memory, a flash memory, a removable memory, a hard drive, a cache, or any other memory that can be coupled to an apparatus.

The apparatus <NUM> or the controller <NUM> may implement any operating system, such as Microsoft Windows®, UNIX®, or LINUX®, Android™, or any other operating system. Apparatus operation software may be written in any programming language, such as C, C++, Java or Visual Basic, for example. Apparatus software may also run on an application framework, such as, for example, a Java® framework, a. NET® framework, or any other application framework. The software and/or the operating system may be stored in the memory <NUM> or elsewhere on the apparatus <NUM>. The apparatus <NUM> or the controller <NUM> may also use hardware to implement disclosed operations. For example, the controller <NUM> may be any programmable processor. Disclosed embodiments may also be implemented on a general-purpose or a special purpose computer, a programmed microprocessor or microprocessor, peripheral integrated circuit elements, an application-specific integrated circuit or other integrated circuits, hardware/electronic logic circuits, such as a discrete element circuit, a programmable logic device, such as a programmable logic array, field programmable gate-array, or the like. In general, the controller <NUM> may be any controller or processor device or devices capable of operating an apparatus and implementing the disclosed embodiments. Some or all of the additional elements of the apparatus <NUM> can also perform some or all of the operations of the disclosed embodiments.

While this disclosure has been described with specific embodiments thereof, it is evident that many alternatives, modifications, and variations will be apparent to those skilled in the art. For example, various components of the embodiments may be interchanged, added, or substituted in the other embodiments. Also, all of the elements of each figure are not necessary for operation of the disclosed embodiments. For example, one of ordinary skill in the art of the disclosed embodiments would be enabled to make and use the teachings of the disclosure by simply employing the elements of the independent claims. Accordingly, embodiments of the disclosure as set forth herein are intended to be illustrative, not limiting. Various changes may be made without departing from the scope of the appended claims.

Claim 1:
A method (<NUM>) for determining physical uplink channel power control parameter values for use after a beam failure recovery in a user equipment, the method comprising:
transmitting (<NUM>) a physical random access channel with a spatial domain transmission filter associated with a selected downlink reference signal from a set of downlink reference signals configured for a link recovery;
determining (<NUM>) whether the selected downlink reference signal is configured for at least one of a set of uplink spatial relation configurations as a reference signal for an uplink spatial relation setting for a physical uplink channel transmission;
determining (<NUM>) a default power control parameter value for the physical uplink channel transmission in response to determining the selected downlink reference signal is not configured for any of the set of uplink spatial relation configurations until the user equipment receives an activation of an uplink spatial relation configuration or a reconfiguration of an uplink spatial relation configuration;
determining (<NUM>) a power control parameter value for the physical uplink channel transmission corresponding to the uplink spatial relation configuration with the selected downlink reference signal as the uplink spatial relation setting in response to determining the selected downlink reference signal is configured for at least one of the set of the uplink spatial relation configurations until the user equipment receives the activation of an uplink spatial relation configuration or the reconfiguration of an uplink spatial relation configuration; and
transmitting (<NUM>) the physical uplink channel with the spatial domain transmission filter associated with the selected downlink reference signal and the determined physical uplink channel power control parameter value.