Reduction of path loss (PL) reference signal (RS) application time

Aspects of the present disclosure provide apparatus, methods, processing systems, and computer readable mediums for reducing path loss reference signal (PL RS) application time. An example method generally includes receiving signaling indicating activation of path loss (PL) reference signals (RSs), determining that the UE can reduce an application time for using the PL RS for uplink power control purposes, wherein the reduced application time is reduced relative to a non-reduced application time, and using PL RS measurements taken according to the reduced application time for uplink power control.

TECHNICAL FIELD

Aspects of the present disclosure relate to wireless communications, and more particularly, to techniques for reducing application time of path loss (PL) reference signal (RS) activation.

BACKGROUND

A control resource set (CORESET) for systems, such as an NR and LTE systems, may comprise one or more control resource (e.g., time and frequency resources) sets, configured for conveying PDCCH, within the system bandwidth. Within each CORESET, one or more search spaces (e.g., common search space (CSS), UE-specific search space (USS), etc.) may be defined for a given UE.

SUMMARY

One innovative aspect of the subject matter described in this disclosure can be implemented in a method for wireless communication by a user equipment (UE). The method generally includes receiving signaling indicating activation of path loss (PL) reference signals (RSs), determining that the UE can reduce an application time for using the PL RS for uplink power control purposes, wherein the reduced application time is reduced relative to a non-reduced application time, and using PL RS measurements taken according to the reduced application time for uplink power control.

One innovative aspect of the subject matter described in this disclosure can be implemented in a method for wireless communication by a network entity. The method generally includes sending, to a user equipment, signaling indicating activation of path loss (PL) reference signals (RSs), determining that the UE can reduce an application time for using the PL RS for uplink power control purposes, wherein the reduced application time is reduced relative to a non-reduced application time, and transmitting PL RS for the UE to measure according to the reduced application time for uplink power control.

One innovative aspect of the subject matter described in this disclosure can be implemented in an apparatus for wireless communication by a user equipment (UE). The apparatus generally includes a receiver configured to receive signaling indicating activation of path loss (PL) reference signals (RSs), and a processor configure to determine that the UE can reduce an application time for using the PL RS for uplink power control purposes, wherein the reduced application time is reduced relative to a non-reduced application time and use PL RS measurements taken according to the reduced application time for uplink power control.

One innovative aspect of the subject matter described in this disclosure can be implemented in an apparatus for wireless communication by a network entity. The apparatus generally includes a transmitter configured to send, to a user equipment, signaling indicating activation of path loss (PL) reference signals (RSs), and a processor configured to determine that the UE can reduce an application time for using the PL RS for uplink power control purposes, wherein the reduced application time is reduced relative to a non-reduced application time, wherein the transmitter is further configured to transmit PL RS for the UE to measure according to the reduced application time for uplink power control.

One innovative aspect of the subject matter described in this disclosure can be implemented in an apparatus for wireless communication by a user equipment (UE). The apparatus generally includes means for receiving signaling indicating activation of path loss (PL) reference signals (RSs), means for determining that the UE can reduce an application time for using the PL RS for uplink power control purposes, wherein the reduced application time is reduced relative to a non-reduced application time, and means for using PL RS measurements taken according to the reduced application time for uplink power control.

One innovative aspect of the subject matter described in this disclosure can be implemented in an apparatus for wireless communication by a network entity. The apparatus generally includes means for sending, to a user equipment, signaling indicating activation of path loss (PL) reference signals (RSs), means for determining that the UE can reduce an application time for using the PL RS for uplink power control purposes, wherein the reduced application time is reduced relative to a non-reduced application time, and means for transmitting PL RS for the UE to measure according to the reduced application time for uplink power control.

Aspects of the present disclosure provide means for, apparatus, processors, and computer-readable mediums for performing the methods described herein.

To the accomplishment of the foregoing and related ends, the one or more aspects comprise the features hereinafter fully described and particularly pointed out in the claims. The following description and the appended drawings set forth in detail some illustrative features of the one or more aspects. These features are indicative, however, of but a few of the various ways in which the principles of various aspects may be employed.

DETAILED DESCRIPTION

Aspects of the present disclosure provide apparatus, methods, processing systems, and computer readable mediums for reducing path loss (PL) reference signal (RS) application time.

FIG.1illustrates an example wireless communication network100in which aspects of the present disclosure may be performed. For example, as shown inFIG.1, UE120amay include a PL RS Application Time Reduction Module122that may be configured to perform (or cause UE120ato perform) operations400ofFIG.4. Similarly, base station110amay include a PL RS Application Time Reduction Module112that may be configured to perform (or cause BS110ato perform) operations500ofFIG.5.

NR access (for example, 5G NR) may support various wireless communication services, such as enhanced mobile broadband (eMBB) targeting wide bandwidth (for example, 80 MHz or beyond), millimeter wave (mmWave) targeting high carrier frequency (for example, 25 GHz or beyond), massive machine type communications MTC (mMTC) targeting non-backward compatible MTC techniques, or mission critical services targeting ultra-reliable low-latency communications (URLLC). These services may include latency and reliability requirements. These services may also have different transmission time intervals (TTI) to meet respective quality of service (QoS) requirements. In addition, these services may co-exist in the same time-domain resource (for example, a slot or subframe) or frequency-domain resource (for example, component carrier).

Wireless communication network100may also include relay stations (for example, relay station110r), also referred to as relays or the like, that receive a transmission of data or other information from an upstream station (for example, a BS110aor a UE120r) and sends a transmission of the data or other information to a downstream station (for example, a UE120or a BS110), or that relays transmissions between UEs120, to facilitate communication between devices.

A network controller130may couple to a set of BSs110and provide coordination and control for these BSs110. The network controller130may communicate with the BSs110via a backhaul. The BSs110may also communicate with one another (for example, directly or indirectly) via wireless or wireline backhaul.

FIG.2shows a block diagram illustrating an example base station (BS) and an example user equipment (UE) in accordance with some aspects of the present disclosure.

At the BS110, a transmit processor220may receive data from a data source212and control information from a controller/processor240. The control information may be for the physical broadcast channel (PBCH), physical control format indicator channel (PCFICH), physical hybrid ARQ indicator channel (PHICH), physical downlink control channel (PDCCH), group common PDCCH (GC PDCCH), etc. The data may be for the physical downlink shared channel (PDSCH), etc. The processor220may process (for example, encode and symbol map) the data and control information to obtain data symbols and control symbols, respectively. The transmit processor220may also generate reference symbols, such as for the primary synchronization signal (PSS), secondary synchronization signal (SSS), and cell-specific reference signal (CRS). A transmit (TX) multiple-input multiple-output (MIMO) processor230may perform spatial processing (for example, precoding) on the data symbols, the control symbols, or the reference symbols, if applicable, and may provide output symbol streams to the modulators (MODs)232a-232t. Each modulator232may process a respective output symbol stream (for example, for OFDM, etc.) to obtain an output sample stream. Each modulator may further process (for example, convert to analog, amplify, filter, and upconvert) the output sample stream to obtain a downlink signal. Downlink signals from modulators232a-232tmay be transmitted via the antennas234a-234t, respectively.

The memories242and282may store data and program codes for BS110and UE120, respectively. A scheduler244may schedule UEs for data transmission on the downlink or uplink.

The controller/processor280or other processors and modules at the UE120may perform or direct the execution of processes for the techniques described herein. As shown inFIG.2, the controller/processor280of the UE120has a PL RS Application Time Reduction Module122that may be configured to perform operations400ofFIG.4, while the controller/processor240of the BS110has a PL RS Application Time Reduction Module112that may be configured to perform operations500ofFIG.5, as discussed in further detail below. Although shown at the Controller/Processor, other components of the UE or BS may be used to perform the operations described herein.

FIG.3is a diagram showing an example of a frame format300for NR. The transmission timeline for each of the downlink and uplink may be partitioned into units of radio frames. Each radio frame may have a predetermined duration (e.g., 10 ms) and may be partitioned into 10 subframes, each of 1 ms, with indices of 0 through 9. Each subframe may include a variable number of slots depending on the subcarrier spacing. Each slot may include a variable number of symbol periods (e.g., 7 or 14 symbols) depending on the subcarrier spacing. The symbol periods in each slot may be assigned indices. A mini-slot, which may be referred to as a sub-slot structure, refers to a transmit time interval having a duration less than a slot (e.g., 2, 3, or 4 symbols).

In NR, a synchronization signal (SS) block is transmitted. The SS block includes a PSS, a SSS, and a two symbol PBCH. The SS block can be transmitted in a fixed slot location, such as the symbols 0-3 as shown inFIG.3. The PSS and SSS may be used by UEs for cell search and acquisition. The PSS may provide half-frame timing, the SS may provide the CP length and frame timing. The PSS and SSS may provide the cell identity. The PBCH carries some basic system information, such as downlink system bandwidth, timing information within radio frame, SS burst set periodicity, system frame number, etc. The SS blocks may be organized into SS bursts to support beam sweeping. Further system information such as, remaining minimum system information (RMSI), system information blocks (SIBs), other system information (OSI) can be transmitted on a physical downlink shared channel (PDSCH) in certain subframes. The SS block can be transmitted up to sixty-four times, for example, with up to sixty-four different beam directions for mmW. The up to sixty-four transmissions of the SS block are referred to as the SS burst set. SS blocks in an SS burst set are transmitted in the same frequency region, while SS blocks in different SS bursts sets can be transmitted at different frequency locations.

A control resource set (CORESET) for systems, such as an NR and LTE systems, may comprise one or more control resource (e.g., time and frequency resources) sets, configured for conveying PDCCH, within the system bandwidth. Within each CORESET, one or more search spaces (e.g., common search space (CSS), UE-specific search space (USS), etc.) may be defined for a given UE. According to aspects of the present disclosure, a CORESET is a set of time and frequency domain resources, defined in units of resource element groups (REGs). Each REG may comprise a fixed number (e.g., twelve) tones in one symbol period (e.g., a symbol period of a slot), where one tone in one symbol period is referred to as a resource element (RE). A fixed number of REGs may be included in a control channel element (CCE). Sets of CCEs may be used to transmit new radio PDCCHs (NR-PDCCHs), with different numbers of CCEs in the sets used to transmit NR-PDCCHs using differing aggregation levels. Multiple sets of CCEs may be defined as search spaces for UEs, and thus a NodeB or other base station may transmit an NR-PDCCH to a UE by transmitting the NR-PDCCH in a set of CCEs that is defined as a decoding candidate within a search space for the UE, and the UE may receive the NR-PDCCH by searching in search spaces for the UE and decoding the NR-PDCCH transmitted by the NodeB.

Example Methods for Reducing Path Loss (PL) Reference Signal (RS) Application Time

Aspects of the present disclosure provide apparatus, methods, processing systems, and computer readable mediums for reducing path loss (PL) reference signal (RS) application time. As used herein, the term application time generally refers to the amount of time before a UE may use a PL RS measurement (e.g., for uplink power control purposes). As will be described in greater detail below, the application time may depend on a number of PL RS samples received by a UE, for example, to allow for sufficient filtering and/or a period with which the PL RS is transmitted.

The techniques presented herein may be applied in various bands utilized for NR. For example, for the higher band referred to as FR4 (e.g., 52.6 GHz-114.25 GHz), an OFDM waveform with very large subcarrier spacing (960 kHz-3.84 MHz) is required to combat severe phase noise. Due to the large subcarrier spacing, the slot length tends to be very short. In a lower band referred to as FR2 (24.25 GHz to 52.6 GHz) with 120 kHz SCS, the slot length is 125 μSec, while in FR4 with 960 kHz, the slot length is 15.6 μSec.

In multi-beam operation (e.g., involving FR1 and FR2 bands), more efficient uplink/downlink beam management may allow for increased intra-cell and inter-cell mobility and/or a larger number of transmission configuration indicator (TCI) states. For example, the states may include the use of a common beam for data and control transmission and reception for UL and DL operations, a unified TCI framework for UL and DL beam indication, and enhanced signaling mechanisms to improve latency and efficiency (e.g., dynamic usage of control signaling).

Some features may facilitate UL beam selection for UEs equipped with multiple panels. For example, UL beam selection may be facilitated through UL beam indication based on a unified TCI framework, enabling simultaneous transmission across multiple panels, and enabling fast panel selection. Further, UE-initiated or L1-event-driven beam management may also reduce latency and the probability that beam failure events occur.

Additional techniques for multi-TRP deployment may target both FR1 and FR2 bands. These techniques may improve reliability and robustness for channels other than the PDSCH (e.g., PDCCH, PUSCH, and PUCCH) using multi-TRP and/or multi-panel operations. These enhancements may enable inter-cell multi-TRP operations and may allow for simultaneous multi-TRP transmission with multi-panel reception.

In some cases, media access control (MAC) control elements (CEs) may be used to activate PL RSs. In other cases, DCI may be used to activate PL RSs. Generally, PL RSs may be downlink signals transmitted from a network entity (e.g., a gNodeB) to a UE and may be used by a UE to determine power control parameters for uplink transmissions. These power control parameters may be used for uplink power control for PUSCH and/or SRS transmissions by a UE, among other uplink transmissions.

In either case, a newly activated PL RS may not be immediately ready to use until after some number of samples (e.g., after 5 PL RS samples from the end of an ACK for the activation MAC-CE or DCI) which may depend on filtering techniques used by the UE. In some cases, the application time can be relatively long. For example, if application is after 5 PL RS samples, and if PL RS has large periodicity (e.g., 20 ms), application time can be 100 ms or more. Thus, the application of power control parameters to uplink transmissions based on the newly activated PL RS may be delayed for some amount of time, during which time communications between the UE and the network entity may use outdated power control parameters that may result, for example, in a failure to receive uplink transmissions until the power control parameters are applied at the UE.

Aspects of the present disclosure provide various options for reducing path loss (PL) reference signal (RS) application time.

FIG.4illustrates example operations400for wireless communication by a UE, in accordance with some aspects of the present disclosure. For example, operations400may be performed by a UE120aofFIG.1to reduce PL RS application time.

Operations400begin, at402, by receiving signaling indicating activation of path loss (PL) reference signals (RSs). The signaling indicating activation of PL RSs may be carried in downlink control information (DCI), a medium access control (MAC) control element (CE), radio resource control (RRC) signaling, or the like. Generally, indications carried in higher layer signaling (e.g., DCIs in PHY layer signaling, MAC CEs, etc.) may impose less processing overhead than indications carried in lower layer signaling (e.g., RRC signaling). Generally, activation of PL RSs may include an indication that PL RSs will be transmitted to the UE and that the UE is to measure the PL RSs for various purposes. For example, activation of PL RSs may indicate that the UE is to measure the PL RSs and use the measurements for uplink power control and/or other purposes, as discussed in further detail below.

At404, the UE determines that the UE can reduce an application time for using the PL RS for uplink power control purposes. Generally, the reduced application time is reduced relative to a non-reduced application time. A non-reduced application time may be, for example, an application time defined by a number of PL RS samples to be measured prior to applying the PL RSs for uplink power control purposes and a periodicity between each PL RS sample, and the reduced application time may be a portion of the non-reduced application time.

At406, the UE uses PL RS measurements taken according to the reduced application time for uplink power control.

FIG.5illustrates example operations500for wireless communication by a network entity, in accordance with some aspects of the present disclosure. For example, operations500may be performed by a gNodeB110ofFIG.1to reduce PL RS application time (by a UE performing operations400).

Operations500begin, at502, by sending, to a user equipment, signaling indicating activation of path loss (PL) reference signals (RSs).

At504, the network entity determines that the UE can reduce an application time for using the PL RS for uplink power control purposes, wherein the reduced application time is reduced relative to a non-reduced application time.

At506, the network entity transmits PL RS for the UE to measure according to the reduced application time for uplink power control.

PL RS application time may be reduced in various manners, as discussed in further detail below.

In one example, a newly activated PL RS may be transmitted with a shorter (“on demand”) periodicity for some time from the end of ACK for the activation MAC-CE, so UE can measure 5 samples in a duration shorter than a normal PL RS period. That is, a same number of PL RS samples may be measured in a reduced application time and a non-reduced application time, though the periodicity at which the PL RS samples are measured may be reduced, and the total time over which the PL RS samples may be reduced.

To enable on demand periodicity, and the corresponding reduced application time, for each PL RS, the gNB may configure two periods: a shorter period and a longer period. The shorter period may be used for X samples, for example, from the end of an ACK. In some cases, the shorter period may have a periodicity of 10 milliseconds or less. After XPL RS samples, the longer period may be used. This longer period may have, for example, a periodicity greater than 10 milliseconds. In some cases, the shorter period may be used for uplink power control, while the longer period may be used for other purposes.

In another example, the UE may reduce a PL RS application time by using a smaller number of PL RS samples for uplink power control. In such a case, instead of applying the newly activated PL RS after a conventional number of samples (e.g., 5), the UE can apply the PL RS earlier (e.g., 3 samples). In some cases, the UE may indicate the earlier application time to gNB. In some cases, the UE can determine the earlier application time based on estimated measurement accuracy. For example, a smaller number of samples—and a corresponding earlier application time—may be sampled if the UE observes an insignificant amount of variation amongst some number of consecutive samples (e.g., if the observed variation of the 3 samples is within some threshold amount of variation). In another example, the UE may determine that an earlier PL RS application time is warranted if the UE has low mobility (e.g., is stationary or substantially stationary). A UE may determine that it is stationary or substantially stationary, for example, based on location information obtained from a satellite positioning system (e.g., NAVSTAR GPS, GLONASS, GALILEO, etc.) or other location services indicating that the UE has remained within a defined area over a period of time.

In still another example, a conventional number of samples (e.g., 5) can be overwritten by the UE capability, which can indicate that fewer samples (e.g., 3) are to be used to apply PL RSs and determine power control parameters for use in uplink transmissions by the UE to the gNB based on the PL RSs. In this case, the UE may signal, to the gNB, its capability for reduced PL RS application time and/or the reduced number of samples corresponding to the reduced application time.

The techniques described herein may be applied to PL RSs, in some cases, with the assumption that PL RSs for AP-SRS/SP-SRS can be activated/updated via a MAC CE and/or DCI. In some cases, a UE can be configured with multiple PL RSs (e.g., via RRC signaling). One of the multiple PL RSs may subsequently be activated/updated via the MAC CE and/or DCI for a SRS resource set.

In some cases, a UE may reuse higher layer filtered RSRP for path loss measurement, with applicable timing after activation (as noted above). Filtered RSRP values for previous path loss RS may be used before the application time (e.g., the next slot after the 5thmeasurement sample for conventional non-reduced application time or after the 3rdsample for reduced application time), where the 1stmeasurement sample corresponds to be the 1stinstance, e.g., 3 ms after sending ACK for the MAC CE. In some cases, these assumptions may only be applicable for UEs supporting the number of RRC-configurable path loss RSs larger than 4, and this is only for the case that the activated PL RS by the MAC CE is not tracked. This is because a UE may only need to track the activated PL RS if there are more than four PL RSs configured via RRC signaling. The UE may determine whether to update the filtered RSRP value for the previous PL RS 3 ms after sending an ACK for the MAC CE.

FIG.6is a call flow diagram illustrating an example of reducing a PL RS application time. As illustrated, UE602receives PL RS activation signaling610from a gNodeB604. As discussed, the signaling610generally indicates that PL RSs will be transmitted by the gNodeB604and that the UE is to use the PL RSs to determine, for example, uplink power control parameters for uplink transmissions to the gNodeB604.

At block612, the UE determines that a reduced application time can be used for the activated PL RS(s). The UE can determine, for example, that a reduced application time can be used based on a plurality of PL RS measurements or other UE mobility statistics. A reduced application time can be used if a number of PL RS measurements are within a threshold amount of each other, if the UE is stationary or substantially stationary as indicated by one or more location information systems (e.g., NAVSTAR GPS, GLONASS, GALILEO, etc.), or other scenarios in which a UE can determine that a normal application time need not be used in order to determine power control parameters for UL transmissions to the gNodeB604.

At block614, the UE determines UL power control parameters based on the PL RS samples. The UE can determine power control parameters based on a same number of PL RS samples taken using a smaller periodicity than taken in a non-reduced PL RS application time period or using a smaller number of PL RS samples taken at a same periodicity as that for PL RSs in the non-reduced application time period. Subsequently, the UE may use the determined UL power control parameters for UL transmissions616to the gNodeB604.

FIG.7illustrates a communications device700that may include various components (e.g., corresponding to means-plus-function components) configured to perform operations for the techniques disclosed herein, such as the operations illustrated inFIG.4. The communications device700includes a processing system702coupled to a transceiver708(e.g., a transmitter and/or a receiver). The transceiver708is configured to transmit and receive signals for the communications device700via an antenna710, such as the various signals as described herein. The processing system702may be configured to perform processing functions for the communications device700, including processing signals received and/or to be transmitted by the communications device700.

The processing system702includes a processor704coupled to a computer-readable medium/memory712via a bus706. In certain aspects, the computer-readable medium/memory712is configured to store instructions (e.g., computer-executable code) that when executed by the processor704, cause the processor704to perform the operations illustrated inFIG.4, or other operations for performing the various techniques discussed herein for reducing a PL RS application time. In certain aspects, computer-readable medium/memory712stores code714for receiving signaling indicating activation of path loss (PL) reference signals (RSs); code716for determining that the UE can reduce an application time for using the PL RS for uplink power control purposes, wherein the reduced application time is reduced relative to a non-reduced application time; and code718for using PL RS measurements taken according to the reduced application time for uplink power control, in accordance with aspects of the present disclosure. In certain aspects, the processor704has circuitry configured to implement the code stored in the computer-readable medium/memory712. The processor704includes circuitry720for receiving signaling indicating activation of path loss (PL) reference signals (RSs); circuitry722for determining that the UE can reduce an application time for using the PL RS for uplink power control purposes, wherein the reduced application time is reduced relative to a non-reduced application time; and circuitry724for using PL RS measurements taken according to the reduced application time for uplink power control, in accordance with aspects of the present disclosure.

FIG.8illustrates a communications device800that may include various components (e.g., corresponding to means-plus-function components) configured to perform operations for the techniques disclosed herein, such as the operations illustrated inFIG.5. The communications device800includes a processing system802coupled to a transceiver808(e.g., a transmitter and/or a receiver). The transceiver808is configured to transmit and receive signals for the communications device800via an antenna810, such as the various signals as described herein. The processing system802may be configured to perform processing functions for the communications device800, including processing signals received and/or to be transmitted by the communications device800.

The processing system802includes a processor804coupled to a computer-readable medium/memory812via a bus806. In certain aspects, the computer-readable medium/memory812is configured to store instructions (e.g., computer-executable code) that when executed by the processor804, cause the processor804to perform the operations illustrated inFIG.5, or other operations for performing the various techniques discussed herein for reducing a PL RS application time. In certain aspects, computer-readable medium/memory812stores code814for sending, to a user equipment, signaling indicating activation of path loss (PL) reference signals (RSs); code816for determining that the UE can reduce an application time for using the PL RS for uplink power control purposes, wherein the reduced application time is reduced relative to a non-reduced application time; and code818for transmitting PL RS for the UE to measure according to the reduced application time for uplink power control, in accordance with aspects of the present disclosure. In certain aspects, the processor804has circuitry configured to implement the code stored in the computer-readable medium/memory812. The processor804includes circuitry820for sending, to a user equipment, signaling indicating activation of path loss (PL) reference signals (RSs); circuitry822for determining that the UE can reduce an application time for using the PL RS for uplink power control purposes, wherein the reduced application time is reduced relative to a non-reduced application time; and circuitry824for transmitting PL RS for the UE to measure according to the reduced application time for uplink power control, in accordance with aspects of the present disclosure.

EXAMPLE EMBODIMENTS

A method for wireless communications by a user equipment (UE), comprising: receiving signaling indicating activation of path loss (PL) reference signals (RSs); determining that the UE can reduce an application time for using the PL RS for uplink power control purposes, wherein the reduced application time is reduced relative to a non-reduced application time; and using PL RS measurements taken according to the reduced application time for uplink power control.

The method of Embodiment 1, wherein the signaling indicating the activation of PL RSs comprises downlink control information (DCI) signaling.

The method of Embodiment 1, wherein the signaling indicating the activation of PL RSs comprises media access control (MAC) control element (CE) signaling.

The method of any of Embodiments 1 through 3, further comprising receiving signaling configuring the UE with at least first and second periods for transmitting the PL RS, wherein the first period is shorter than the second period and the reduced application time is achieved by measuring PL RS transmitted according to the first period.

The method of Embodiment 4, wherein: the UE uses the first period to reduce the application time after activation for a first measurement; and subsequently measures PL RSs transmitted to the UE according to the second period.

The method of claim4, wherein: the UE uses PL RSs transmitted to the UE according to the first period for uplink power control purposes; and the UE uses PL RSs transmitted to the UE according to the second period for one or more purposes other than uplink power control.

The method of any of Embodiments 1 through 6, wherein the UE achieves the reduced application by measuring fewer PL RS samples than a number of samples associated with the non-reduced application time.

The method of Embodiment 7, wherein the UE determines to use the reduced application time based on at least one of estimated measurement accuracy or mobility of the UE.

The method of any of Embodiments 1 through 8, further comprising signaling, to a network entity, capability of the UE to support the reduced application time.

The method of Embodiment 9, further comprising signaling, to the network entity, an indication of the reduced application time.

A method for wireless communications by a network entity, comprising: sending, to a user equipment, signaling indicating activation of path loss (PL) reference signals (RSs); determining that the UE can reduce an application time for using the PL RS for uplink power control purposes, wherein the reduced application time is reduced relative to a non-reduced application time; and transmitting PL RS for the UE to measure according to the reduced application time for uplink power control.

The method of Embodiment 11, wherein the signaling indicating the activation of PL RSs comprises downlink control information (DCI) signaling.

The method of Embodiment 11, wherein the signaling indicating the activation of PL RSs comprises media access control (MAC) control element (CE) signaling.

The method of any of Embodiments 11 through 13, further comprising sending signaling configuring the UE with at least first and second periods for transmitting the PL RS, wherein the first period is shorter than the second period and the reduced application time is achieved by measuring PL RS transmitted according to the first period.

The method of Embodiment 14, wherein: the network entity transmits PL RSs according to the first period to reduce the application time after activation for a first measurement by the UE; and the network entity subsequently transmits PL RSs according to the second period.

The method of any of Embodiments 11 through 15, further comprising receiving signaling, from the UE, indicating capability of the UE to support the reduced application time.

The method of Embodiment 16, further comprising receiving signaling, from the UE, indicating the reduced application time.

An apparatus for wireless communications by a user equipment (UE), comprising: a processor; and a memory having instructions which, when executed by the processor, performs the operations of any of Embodiments 1 through 10.

An apparatus for wireless communications by a network entity, comprising: a processor; and a memory having instructions which, when executed by the processor, performs the operations of any of Embodiments 11 through 17.

An apparatus for wireless communications by a user equipment (UE), comprising: means capable of performing the operations of any of Embodiments 1 through 10.

An apparatus for wireless communications by a network entity, comprising: means capable of performing the operations of any of Embodiments 11 through 17.

A computer-readable medium having instructions stored thereon which, when executed by a processor, performs the operations of any of Embodiments 1 through 10.

A computer-readable medium having instructions stored thereon which, when executed by a processor, performs the operations of any of Embodiments 11 through 17.

Additional Considerations

The techniques described herein may be used for the wireless networks and radio technologies mentioned above as well as other wireless networks and radio technologies. For clarity, while aspects may be described herein using terminology commonly associated with 3G, 4G, or 5G wireless technologies, aspects of the present disclosure can be applied in other generation-based communication systems.

NR may utilize OFDM with a CP on the uplink and downlink and include support for half-duplex operation using TDD. In NR, a subframe is still 1 ms, but the basic TTI is referred to as a slot. A subframe contains a variable number of slots (for example, 1, 2, 4, 8, 16, . . . slots) depending on the subcarrier spacing. The NR RB is 12 consecutive frequency subcarriers. NR may support a base subcarrier spacing of 15 KHz and other subcarrier spacing may be defined with respect to the base subcarrier spacing, for example, 30 kHz, 60 kHz, 120 kHz, 240 kHz, etc. The symbol and slot lengths scale with the subcarrier spacing. The CP length also depends on the subcarrier spacing. Beamforming may be supported and beam direction may be dynamically configured. MIMO transmissions with precoding may also be supported. In some examples, MIMO configurations in the DL may support up to 8 transmit antennas with multi-layer DL transmissions up to 8 streams and up to 2 streams per UE. In some examples, multi-layer transmissions with up to 2 streams per UE may be supported. Aggregation of multiple cells may be supported with up to 8 serving cells.

As used herein, the term “determining” may encompass one or more of a wide variety of actions. For example, “determining” may include calculating, computing, processing, deriving, investigating, looking up (for example, looking up in a table, a database or another data structure), assuming and the like. Also, “determining” may include receiving (for example, receiving information), accessing (for example, accessing data in a memory) and the like. Also, “determining” may include resolving, selecting, choosing, establishing and the like.

As used herein, “or” is used intended to be interpreted in the inclusive sense, unless otherwise explicitly indicated. For example, “a or b” may include a only, b only, or a combination of a and b. As used herein, a phrase referring to “at least one of” or “one or more of” a list of items refers to any combination of those items, including single members. For example, “at least one of: a, b, or c” is intended to cover the possibilities of: a only, b only, c only, a combination of a and b, a combination of a and c, a combination of b and c, and a combination of a and b and c.