Path loss estimation using path loss reference signal activation and deactivation

Abstract

Methods, systems, and apparatus for wireless communications are described. In some systems, a user equipment (UE) may perform path loss estimation to support uplink transmit power control. The UE (115‑a) may perform path loss estimation on a path loss reference signal (220) configured by a base station (105‑a). In some cases, the base station (105‑a) may use a medium access control (MAC) control element (CE) to update (e.g., activate, deactivate, or both) a particular path loss reference signal. The UE may determine one or more path loss reference signals to be used for path loss estimation based on one or more techniques. For example, the UE may filter path loss measurements over a time duration, or may use a single unfiltered path loss measurement for path loss estimation. Additionally or alternatively, the UE may receive a disabled path loss reference signal (e.g., for a set amount of time or any amount of time), or may suppress receiving a disabled path loss reference signal.

Description

[0001] Cross-references

[0002] This patent application is the priority of U.S. patent application No. 16 / 803,835, entitled “PATH-LOSS ESTIMATION USING PATH-LOSS REFERENCE SIGNAL ACTIVIATION AND DEACTIVATION,” filed by RYU et al. on February 27, 2020, which claims the benefit of U.S. Provisional Patent Application No. 62 / 900,584, entitled “PATH-LOSS ESTIMATION USING PATH-LOSS REFERENCE SIGNAL ACTIVATION AND DEACTIVATION,” filed by RYU et al. on September 15, 2019, which applications are assigned to the assignee of this application.

[0003] introduction

[0004] The following relates to wireless communications, and more particularly to path loss estimation.

[0005] Wireless communication systems are widely deployed to provide various types of communication content, such as voice, video, packet data, messaging, broadcasting, etc. These systems may be able to support communication with multiple users by sharing available system resources (e.g., time, frequency, and power). Examples of such multiple access systems include fourth generation (4G) systems (such as long term evolution (LTE) systems, advanced LTE (LTE-A) systems, or LTE-A Pro systems), and fifth generation (5G) systems, which may be referred to as new radio (NR) systems. These systems may use various technologies, such as code division multiple access (CDMA), time division multiple access (TDMA), frequency division multiple access (FDMA), orthogonal frequency division multiple access (OFDMA), or discrete Fourier transform spread orthogonal frequency division multiplexing (DFT-S-OFDM). A wireless multiple access communication system may include one or more base stations or one or more network access nodes, each base station or network access node simultaneously supporting communication with multiple communication devices, which may be referred to as user equipment (UE) in addition.

[0006] Overview

[0007] A method for wireless communication at a UE is described. The method may include receiving, from a base station, a configuration for a set of configured reference signals for path loss estimation, determining a reference signal to be used for path loss estimation from the set of configured reference signals, calculating a path loss estimate using the determined reference signal, and transmitting an uplink message according to an uplink transmit power based on the path loss estimate.

[0008] An apparatus for wireless communication at a UE is described. The apparatus may include a processor and a memory coupled to the processor, the processor and the memory being configured to: receive a configuration for a set of configured reference signals for path loss estimation from a base station, determine a reference signal to be used for path loss estimation from the set of configured reference signals, calculate a path loss estimate using the determined reference signal, and transmit an uplink message according to an uplink transmit power based on the path loss estimate.

[0009] Another apparatus for wireless communication at a UE is described. The apparatus may include means for receiving, from a base station, a configuration for a set of configured reference signals for path loss estimation, determining a reference signal to be used for path loss estimation from the set of configured reference signals, calculating a path loss estimate using the determined reference signal, and transmitting an uplink message based on an uplink transmit power based on the path loss estimate.

[0010] A non-transitory computer-readable medium storing code for wireless communication at a UE is described. The code may include instructions executable by a processor for receiving a configuration for a set of configured reference signals for path loss estimation from a base station, determining a reference signal to be used for path loss estimation from the set of configured reference signals, calculating a path loss estimate using the determined reference signal, and transmitting an uplink message according to an uplink transmit power based on the path loss estimate.

[0011] Some examples of the methods, devices (apparatus), and non-transitory computer-readable media described herein may further include operations, features, apparatuses, or instructions for the following actions: updating the determined reference signal, wherein determining the reference signal to be used for the path loss estimation may be based on updating the determined reference signal.

[0012] In some examples of the methods, devices (apparatus), and non-transitory computer-readable media described herein, updating the determined reference signal may involve activating the determined reference signal, and determining the reference signal to be used for the path loss estimation may be based on the determined reference signal being an activated reference signal.

[0013] Some examples of the methods, devices (apparatus), and non-transitory computer-readable media described herein may further include operations, features, apparatuses, or instructions for the following actions: receiving a media access control (MAC) control element (CE) indicating the reference signal from the base station, wherein the update may be based on the MAC-CE.

[0014] Some examples of the methods, devices (apparatus), and non-transitory computer-readable media described herein may further include operations, features, apparatus, or instructions for the following actions: after the updating and based on the periodicity of the determined reference signal, receiving from the base station an active reference signal set corresponding to the determined reference signal, and measuring a path loss value set based on receiving the active reference signal set, wherein the path loss estimate can be calculated using the measured path loss value set.

[0015] Some examples of the methods, devices (apparatus), and non-transitory computer-readable media described herein may further include operations, features, apparatus, or instructions for performing layer 3 (L3) filtering on the measured set of path loss values, wherein the path loss estimate may be calculated based on the L3 filtering.

[0016] Some examples of the methods, devices, and non-transitory computer-readable media described herein may further include operations, features, devices, or instructions for determining a set of active reference signals to be received for the path loss estimate based on a threshold number of active reference signals or a threshold duration for measuring the set of path loss values, or both.

[0017] Some examples of the methods, devices (apparatus), and non-transitory computer-readable media described herein may further include operations, features, apparatus, or instructions for the following actions: receiving a determined reference signal from the base station after the update, and measuring a path loss value based on receiving the determined reference signal, wherein the path loss estimate can be calculated using the measured path loss value.

[0018] Some examples of the methods, devices, and non-transitory computer-readable media described herein may further include operations, features, devices, or instructions for the following actions: updating an additional reference signal in the configured reference signal set based on updating the determined reference signal, wherein updating the additional reference signal may involve deactivating the additional reference signal.

[0019] Some examples of the methods, devices (apparatus), and non-transitory computer-readable media described herein may further include operations, features, apparatus, or instructions for the following actions: receiving the additional reference signal from the base station after the deactivation, and measuring an additional path loss value based on receiving the additional reference signal.

[0020] Some examples of the methods, devices, and non-transitory computer-readable media described herein may further include operations, features, devices, or instructions for further updating the additional reference signal, wherein further updating the additional reference signal may involve reactivating the additional reference signal, calculating an additional path loss estimate using the measured additional path loss value, and transmitting an additional uplink message based on the additional uplink transmit power based on the additional path loss estimate and the reactivation of the additional reference signal.

[0021] Some examples of methods, devices (apparatus), and non-transitory computer-readable media described herein may further include operations, features, means, or instructions for: refraining from receiving the additional reference signal after the deactivating.

[0022] Some examples of the methods, devices (apparatus), and non-transitory computer-readable media described herein may further include operations, features, apparatus, or instructions for: activating a timer after the deactivation, receiving the additional reference signal from the base station after the deactivation if the timer is running, identifying expiration of the timer, and suppressing reception of the additional reference signal after the deactivation if the timer is inactive.

[0023] Some examples of the methods, devices, and non-transitory computer-readable media described herein may further include operations, features, devices, or instructions for storing an additional path loss estimate corresponding to the additional reference signal upon the deactivation, further updating the additional reference signal, wherein further updating the additional reference signal may involve reactivating the additional reference signal, and transmitting an additional uplink message based on the additional uplink transmit power based on the stored additional path loss estimate and the reactivation of the additional reference signal.

[0024] In some examples of the methods, devices (apparatus), and non-transitory computer-readable media described herein, determining a reference signal from a configured reference signal set to be used for the path loss estimation may include operations, features, apparatus, or instructions for the following actions: determining a set of active reference signals from a configured reference signal set to be used for a path loss estimation set corresponding to a communication beam set.

[0025] In some examples of the methods, devices (apparatus), and non-transitory computer-readable media described herein, the number of reference signals in the active reference signal set may be less than or equal to the number of reference signals in the configured reference signal set.

[0026] Some examples of the methods, devices (apparatus), and non-transitory computer-readable media described herein may further include operations, features, apparatus, or instructions for the following actions: transmitting an indication of UE beamforming capability to the base station, wherein the number of reference signals in the configured reference signal set or the number of reference signals in the active reference signal set, or both, may be based on the UE beamforming capability.

[0027] In some examples of the methods, devices, and non-transitory computer-readable media described herein, receiving the configuration may include operations, features, means, or instructions for the following actions: receiving a radio resource control (RRC) message indicating the configuration.

[0028] In some examples of the methods, devices (apparatus), and non-transitory computer-readable media described herein, the uplink message includes an uplink data packet or a sounding reference signal (SRS), or both.

[0029] A method for wireless communication at a base station is described. The method may include transmitting to a UE a configuration for a set of configured reference signals for path loss estimation at the UE, updating a reference signal in the set of configured reference signals for the path loss estimation, transmitting to the UE the updated reference signal, and receiving from the UE an uplink message transmitted at an uplink transmit power based on a path loss measurement for the updated reference signal.

[0030] An apparatus for wireless communication at a base station is described. The apparatus may include a processor and a memory coupled to the processor, wherein the processor and the memory are configured to: transmit to a UE a configuration for a set of configured reference signals for path loss estimation at the UE, update a reference signal in the set of configured reference signals for the path loss estimation, transmit to the UE the updated reference signal, and receive an uplink message from the UE, the uplink message being transmitted at an uplink transmit power based on a path loss measurement for the updated reference signal.

[0031] Another apparatus for wireless communication at a base station is described. The apparatus may include means for transmitting to a UE a configuration for a set of configured reference signals for path loss estimation at the UE, updating a reference signal in the set of configured reference signals for the path loss estimation, transmitting to the UE the updated reference signal, and receiving from the UE an uplink message transmitted at an uplink transmit power based on a path loss measurement for the updated reference signal.

[0032] A non-transitory computer-readable medium storing code for wireless communication at a base station is described. The code may include instructions executable by a processor for transmitting to a UE a configuration for a set of configured reference signals for path loss estimation at the UE, updating a reference signal in the set of configured reference signals for the path loss estimation, transmitting to the UE the updated reference signal, and receiving from the UE an uplink message transmitted at an uplink transmit power based on a path loss measurement for the updated reference signal.

[0033] In some examples of the methods, devices (apparatus), and non-transitory computer-readable media described herein, updating the reference signal may include operations, features, means, or instructions for the following actions: transmitting a MAC-CE indicating the reference signal to the UE.

[0034] In some examples of the methods, devices (apparatus), and non-transitory computer-readable media described herein, updating the reference signal may involve activating the reference signal.

[0035] In some examples of the methods, devices, and non-transitory computer-readable media described herein, transmitting an updated reference signal may include operations, features, devices, or instructions for the following actions: after the update and based on the periodicity of the updated reference signal, transmitting an active reference signal set corresponding to the updated reference signal to the UE, wherein the uplink transmit power may be based on a path loss measurement set of the active reference signal set.

[0036] Some examples of the methods, devices (apparatus), and non-transitory computer-readable media described herein may further include operations, features, means, or instructions for transmitting a deactivated reference signal in the configured reference signal set to the UE.

[0037] Some examples of the methods, devices, and non-transitory computer-readable media described herein may further include operations, features, devices, or instructions for: updating a deactivated reference signal used for the path loss estimation, wherein updating the deactivated reference signal may involve activating the deactivated reference signal, and receiving an additional uplink message from the UE based on an additional uplink transmit power based on an additional path loss measurement for the deactivated reference signal.

[0038] Some examples of methods, apparatuses, and non-transitory computer-readable media described herein may further include operations, features, means, or instructions for refraining from transmitting disabled reference signals in the configured reference signal set.

[0039] Some examples of the methods, devices (apparatus), and non-transitory computer-readable media described herein may further include operations, features, apparatus, or instructions for the following actions: updating an additional reference signal in a configured reference signal set for the path loss estimation, wherein updating the additional reference signal may involve deactivating the additional reference signal, activating a timer after the deactivation, transmitting the additional reference signal to the UE after the deactivation if the timer is running, identifying expiration of the timer, and suppressing transmission of the additional reference signal after the deactivation if the timer is inactive.

[0040] Some examples of the methods, devices (apparatus), and non-transitory computer-readable media described herein may further include operations, features, apparatus, or instructions for the following actions: updating a reference signal set in a configured reference signal set for a path loss estimation set corresponding to a communication beam set, wherein updating the reference signal set may involve activating the reference signal set.

[0041] In some examples of the methods, devices (apparatus), and non-transitory computer-readable media described herein, the number of reference signals in the activated reference signal set may be less than or equal to the number of reference signals in the configured reference signal set.

[0042] Some examples of the methods, devices (apparatus), and non-transitory computer-readable media described herein may further include operations, features, apparatuses, or instructions for the following actions: receiving an indication of UE beamforming capabilities from the UE, and determining the configuration based on the UE beamforming capabilities.

[0043] In some examples of the methods, devices (apparatus), and non-transitory computer-readable media described herein, transmitting the configuration may include operations, features, means, or instructions for: transmitting an RRC message indicating the configuration.

[0044] In some examples of the methods, devices (apparatus), and non-transitory computer-readable media described herein, the uplink message includes an uplink data packet, or an SRS, or both.

[0045] A method for wireless communication at a UE is described. The method may include receiving a MAC-CE from a base station that updates a first reference signal, determining a second reference signal to be used for path loss estimation from a set of configured reference signals based on the updated first reference signal, calculating a path loss estimate using the determined second reference signal, and transmitting an uplink message according to an uplink transmit power based on the path loss estimate.

[0046] An apparatus for wireless communication at a UE is described. The apparatus may include a processor and a memory coupled to the processor, the processor and the memory being configured to: receive a MAC-CE updating a first reference signal from a base station, determine a second reference signal to be used for path loss estimation from a configured reference signal set based on the updated first reference signal, calculate a path loss estimation using the determined second reference signal, and transmit an uplink message according to an uplink transmit power based on the path loss estimation.

[0047] Another apparatus for wireless communication at a UE is described. The apparatus may include means for receiving a MAC-CE updating a first reference signal from a base station, determining a second reference signal to be used for path loss estimation from a set of configured reference signals based on the updated first reference signal, calculating a path loss estimate using the determined second reference signal, and transmitting an uplink message according to an uplink transmit power based on the path loss estimate.

[0048] A non-transitory computer-readable medium storing code for wireless communication at a UE is described. The code may include instructions executable by a processor for: receiving a MAC-CE updating a first reference signal from a base station, determining a second reference signal to be used for path loss estimation from a configured reference signal set based on the updated first reference signal, calculating a path loss estimate using the determined second reference signal, and transmitting an uplink message according to an uplink transmit power based on the path loss estimate.

[0049] In some examples of the methods, devices, and non-transitory computer-readable media described herein, the MAC-CE may activate a first reference signal, and the first reference signal may be the same as a second reference signal, or the MAC-CE may deactivate the first reference signal, and the first reference signal may be different from the second reference signal. BRIEF DESCRIPTION OF THE DRAWINGS

[0051] Figures 1 to 3 An example of a wireless communication system that supports path loss estimation using path loss reference signal activation and deactivation in accordance with one or more aspects of the present disclosure is illustrated.

[0052] Figure 4 An example of a process flow supporting path loss estimation using path loss reference signal activation and deactivation in accordance with one or more aspects of the present disclosure is illustrated.

[0053] Figure 5 and 6 A block diagram of an apparatus supporting path loss estimation using path loss reference signal activation and deactivation according to one or more aspects of the present disclosure is shown.

[0054] Figure 7 A block diagram of a communications manager supporting path loss estimation using path loss reference signal activation and deactivation is shown in accordance with one or more aspects of the present disclosure.

[0055] Figure 8 A diagram of a system including a device supporting path loss estimation using path loss reference signal activation and deactivation in accordance with one or more aspects of the present disclosure is shown.

[0056] Fig. 9 and 10 A block diagram of an apparatus supporting path loss estimation using path loss reference signal activation and deactivation according to one or more aspects of the present disclosure is shown.

[0057] Fig.11 A block diagram of a communications manager supporting path loss estimation using path loss reference signal activation and deactivation is shown in accordance with one or more aspects of the present disclosure.

[0058] Fig.12 A diagram of a system including a device supporting path loss estimation using path loss reference signal activation and deactivation in accordance with one or more aspects of the present disclosure is shown.

[0059] Figures 13 to 17 A flow chart illustrating a method of supporting path loss estimation using path loss reference signal activation and deactivation according to one or more aspects of the present disclosure is shown.

[0060] Detailed Description

[0061] In a wireless communication system, over-the-air (OTA) transmissions may experience signal power attenuation due to one or more factors. To account for such signal power attenuation, a UE may perform path loss estimation for a particular channel. For example, a base station may configure a set of reference signals for the UE to be used for path loss estimation. The UE may receive a path loss reference signal and may determine a path loss estimate based on a reference signal received power (RSRP) of the path loss reference signal (e.g., compared to a reference signal transmit power used by a base station). The UE may select an uplink transmit power for uplink transmission on the particular channel based on the path loss estimate (e.g., and other uplink transmit power control parameters).

[0062] However, in some cases, the channel used for transmission may change frequently. For example, if the UE and the base station implement beamforming technology, changes in the beam pairs used by the UE and the base station may change the path loss associated with the transmission. In some cases, the UE may be able to (or may implement) track path loss estimates for a subset of all possible beam pairs (e.g., due to the number of combinations, available channel overhead, available processing power, etc.). To support such tracking, the base station may activate specific reference signals for path loss estimation and may deactivate other reference signals for path loss estimation. In some cases, activating and deactivating reference signals for path loss estimation may be referred to as updating reference signals. For example, the base station may use MAC-CE to update (e.g., activate or deactivate) a specific path loss reference signal at the UE. The UE may implement one or more techniques for handling path loss estimation using path loss reference signal activation and deactivation.

[0063] In some cases, the UE may filter (e.g., average) path loss measurements across several received path loss reference signals to determine a path loss estimate. For example, the UE may be configured with a time duration for filtering path loss measurements. During the time duration, the UE may receive multiple repetitions of the path loss reference signal (e.g., according to the periodicity or scheduling of the path loss reference signal), and may filter the path loss measurement to determine an accurate path loss estimate over time (e.g., robustness to burst interference in the system). In some other cases, the UE may use a single unfiltered path loss reference signal measurement for path loss estimation (e.g., for low latency estimation). In some examples, the UE may track (e.g., receive, filter, or both) a disabled path loss reference signal. In some other examples, the UE may not track a disabled path loss reference signal. In yet other examples, the UE may track a disabled path loss reference signal within a set time duration after deactivation (e.g., according to a timer), and may then stop tracking the disabled path loss reference signal. In some cases, the base station may configure a number of configured path loss reference signals for the UE that is greater than the number of activated path loss reference signals (e.g., based on a maximum number of activated path loss reference signals supported by the UE). In some other cases, the base station may configure a number of configured path loss reference signals for the UE that is equal to the number of activated path loss reference signals. A path loss reference signal may be "active" from the perspective of the UE if the UE measures received signal properties of a path loss reference signal to estimate path loss that may be used in an uplink power control algorithm. A path loss reference signal may be "inactive" or "deactivated" from the perspective of the UE if the UE does not perform path loss estimation based on the path loss reference signal.

[0064] Various aspects of the present disclosure are initially described in the context of wireless communication systems. Various aspects of the present disclosure are further illustrated and described by and with reference to process flows, apparatus diagrams, system diagrams, and flow charts related to path loss estimation using path loss reference signal updates (e.g., activation and deactivation).

[0065] Figure 1 An example of a wireless communication system 100 that supports path loss estimation using path loss reference signal activation and deactivation according to one or more aspects of the present disclosure is illustrated. The wireless communication system 100 may include one or more base stations 105, one or more UEs 115, and a core network 130. In some examples, the wireless communication system 100 may be an LTE network, an LTE-A network, an LTE-A Pro network, or an NR network. In some examples, the wireless communication system 100 may support enhanced broadband communications, ultra-reliable (e.g., mission-critical) communications, low latency communications, communications with low-cost and low-complexity devices, or any combination thereof.

[0066] The base stations 105 may be dispersed throughout a geographic area to form the wireless communication system 100, and may be different forms of devices or devices with different capabilities. The base stations 105 and the UEs 115 may communicate wirelessly via one or more communication links 125. Each base station 105 may provide a coverage area 110 over which the UEs 115 and the base stations 105 may establish one or more communication links 125. The coverage area 110 may be an example of a geographic area over which the base stations 105 and the UEs 115 support communication of signals according to one or more radio access technologies.

[0067] The UEs 115 may be dispersed throughout the coverage area 110 of the wireless communication system 100, and each UE 115 may be stationary or mobile, or stationary and mobile at different times. The UEs 115 may be different forms of devices or devices with different capabilities. Figure 1 105. The UE 115 described herein may be capable of communicating with various types of devices, such as other UEs 115, base stations 105, or network equipment (e.g., core network nodes, relay devices, integrated access and backhaul (IAB) nodes, or other network equipment), such as Figure 1 as shown in .

[0068] Each base station 105 may communicate with the core network 130 or with each other or both. For example, the base station 105 may interface with the core network 130 via one or more backhaul links 120 (e.g., via S1, N2, N3, or other interfaces). The base stations 105 may communicate with each other directly (e.g., directly between the base stations 105) or indirectly (e.g., via the core network 130), or directly and indirectly on the backhaul link 120 (e.g., via X2, Xn, or other interfaces). In some examples, the backhaul link 120 may be or include one or more wireless links.

[0069] One or more of the base stations 105 described herein may include or may be referred to by a person of ordinary skill in the art as a base transceiver station, a radio base station, an access point, a radio transceiver, a B node, an evolved B node (eNB), a next generation B node or a gigabit B node (any of which may be referred to as a gNB), a home B node, a home evolved B node, or other suitable terminology.

[0070] UE 115 may include or may be referred to as a mobile device, a wireless device, a remote device, a handheld device, or a subscriber device, or some other suitable term, where a "device" may also be referred to as a unit, a station, a terminal, or a client, etc. UE 115 may also include or may be referred to as a personal electronic device, such as a cellular phone, a personal digital assistant (PDA), a tablet computer, a laptop computer, or a personal computer. In some examples, UE 115 may include or be referred to as a wireless local loop (WLL) station, an Internet of Things (IoT) device, an Internet of Everything (IoE) device, or a machine type communication (MTC) device, etc., which may be implemented in various objects such as electrical appliances or vehicles, meters, etc.

[0071] The UE 115 described herein may be able to communicate with various types of devices, such as other UEs 115, which may sometimes act as relays, as well as base stations 105 and network equipment including macro eNBs or gNBs, small cell eNBs or gNBs, relay base stations, etc. Figure 1 as shown in .

[0072] The UE 115 and the base station 105 may communicate wirelessly with each other via one or more communication links 125 on one or more carriers. The term "carrier" may refer to a set of radio frequency spectrum resources having a defined physical layer structure for supporting the communication link 125. For example, a carrier for the communication link 125 may include a portion of a radio frequency spectrum band (e.g., a bandwidth portion (BWP)) that operates according to one or more physical layer channels for a given radio access technology (e.g., LTE, LTE-A, LTE-A Pro, NR). Each physical layer channel may carry acquisition signaling (e.g., synchronization signals, system information), control signaling for coordinating carrier operations, user data, or other signaling. The wireless communication system 100 may support communication with the UE 115 using carrier aggregation or multi-carrier operation. The UE 115 may be configured to have multiple downlink component carriers and one or more uplink component carriers according to a carrier aggregation configuration. Carrier aggregation may be used in conjunction with both frequency division duplex (FDD) and time division duplex (TDD) component carriers.

[0073] The signal waveform transmitted on the carrier may include multiple subcarriers (e.g., using multi-carrier modulation (MCM) techniques, such as orthogonal frequency division multiplexing (OFDM) or discrete Fourier transform spread OFDM (DFT-S-OFDM)). In a system using MCM technology, a resource element may include a code element period (e.g., the duration of a modulation code element) and a subcarrier, where the code element period and the subcarrier spacing are inversely related. The number of bits carried by each resource element may depend on the modulation scheme (e.g., the order of the modulation scheme, the coding rate of the modulation scheme, or both). Thus, the more resource elements received by UE 115 and the higher the order of the modulation scheme, the higher the data rate of UE 115 can be. Wireless communication resources may refer to a combination of radio frequency spectrum resources, time resources, and spatial resources (e.g., spatial layers or beams), and the use of multiple spatial layers may further improve the data rate or data integrity of communication with UE 115.

[0074] The time interval of the base station 105 or the UE 115 can be expressed as a multiple of a basic time unit, and the basic time unit can be, for example, a sampling period T s =1 / (Δf max ·N f ) seconds, where Δf max It can represent the maximum supported subcarrier spacing, and N f The maximum supported discrete Fourier transform (DFT) size may be indicated. Time intervals of communication resources may be organized according to radio frames, each having a specified duration (e.g., 10 milliseconds (ms)). Each radio frame may be identified by a system frame number (SFN) (e.g., ranging from 0 to 1023).

[0075] Each frame may include a plurality of consecutively numbered subframes or time slots, and each subframe or time slot may have the same duration. In some examples, a frame may be divided into subframes (e.g., in the time domain), and each subframe may be further divided into a number of time slots. Alternatively, each frame may include a variable number of time slots, and the number of time slots may depend on the subcarrier spacing. Each time slot may include a number of code element periods (e.g., depending on the length of the cyclic prefix added before each code element period). In some wireless communication systems 100, a time slot may be further divided into a plurality of mini-time slots containing one or more code elements. Excluding the cyclic prefix, each code element period may contain one or more (e.g., N f The duration of a symbol period may depend on the subcarrier spacing or the operating band.

[0076] A subframe, slot, mini-slot, or symbol may be the smallest scheduling unit (e.g., in the time domain) of the wireless communication system 100 and may be referred to as a transmission time interval (TTI). In some examples, the TTI duration (e.g., the number of symbol periods in a TTI) may be variable. Additionally or alternatively, the smallest scheduling unit of the wireless communication system 100 may be dynamically selected (e.g., in bursts of shortened TTIs (sTTIs)).

[0077] Physical channels may be multiplexed on a carrier according to various techniques. Physical control channels and physical data channels may be multiplexed on a downlink carrier, for example, using one or more of a time division multiplexing (TDM) technique, a frequency division multiplexing (FDM) technique, or a hybrid TDM-FDM technique. A control region (e.g., a control resource set (CORESET)) for a physical control channel may be defined by a number of symbol periods and may extend across a system bandwidth or a subset of a system bandwidth of a carrier. One or more control regions (e.g., CORESETs) may be configured for a set of UEs 115. For example, one or more of the UEs 115 may monitor or search a control region for control information according to one or more search space sets, and each search space set may include one or more control channel candidates in one or more aggregation levels arranged in a cascaded manner. An aggregation level for a control channel candidate may refer to the number of control channel resources (e.g., control channel elements (CCEs)) associated with coded information for a control information format having a given payload size. The search space sets may include a common search space set configured for transmitting control information to multiple UEs 115 and a UE-specific search space set for transmitting control information to a specific UE 115 .

[0078] In some examples, base stations 105 may be mobile and thus provide communication coverage for mobile geographic coverage areas 110. In some examples, different geographic coverage areas 110 associated with different technologies may overlap, and the different geographic coverage areas 110 may be supported by the same base station 105. In other examples, overlapping geographic coverage areas 110 associated with different technologies may be supported by different base stations 105. The wireless communication system 100 may include, for example, a heterogeneous network in which different types of base stations 105 provide coverage for various geographic coverage areas 110 using the same or different radio access technologies.

[0079] The wireless communication system 100 may be configured to support ultra-reliable communication or low latency communication or various combinations thereof. For example, the wireless communication system 100 may be configured to support ultra-reliable low latency communication (URLLC) or mission-critical communication. UE 115 may be designed to support ultra-reliable, low latency or critical functions (e.g., mission-critical functions). Ultra-reliable communication may include private communication or group communication, and may be supported by one or more mission-critical services (such as mission-critical push-to-talk (MCPTT), mission-critical video (MCVideo), or mission-critical data (MCData). Support for mission-critical functions may include prioritization of services, and mission-critical services may be used for public safety or general commercial applications. The terms ultra-reliable, low latency, critical mission, and ultra-reliable low latency may be used interchangeably herein.

[0080] In some examples, UE 115 may also be able to communicate directly with other UE 115 over a device-to-device (D2D) communication link 135 (e.g., using a peer-to-peer (P2P) or D2D protocol). One or more UEs 115 utilizing D2D communication may be within a geographic coverage area 110 of a base station 105. Other UEs 115 in such a group may be outside the geographic coverage area 110 of the base station 105, or may not be able to receive transmissions from the base station 105 for other reasons. In some examples, a group of UEs 115 communicating via D2D communication may utilize a one-to-many (1:M) system, wherein each UE 115 transmits to each other UE 115 in the group. In some examples, the base station 105 facilitates the scheduling of resources for D2D communication. In other cases, D2D communication is performed between UEs 115 without involving the base station 105.

[0081] The core network 130 may provide user authentication, access authorization, tracking, Internet Protocol (IP) connectivity, and other access, routing, or mobility functions. The core network 130 may be an evolved packet core (EPC) or a 5G core (5GC), and the EPC or 5GC may include at least one control plane entity (e.g., a mobility management entity (MME), an access and mobility management function (AMF)) for managing access and mobility, and at least one user plane entity (e.g., a serving gateway (S-GW), a packet data network (PDN) gateway (P-GW), or a user plane function (UPF)) for routing packets or interconnecting to an external network. The control plane entity may manage non-access stratum (NAS) functions, such as mobility, authentication, and bearer management of UE 115 served by a base station 105 associated with the core network 130. User IP packets may be delivered via a user plane entity, which may provide IP address allocation and other functions. The user plane entity may be connected to a network operator IP service 150. Operator IP services 150 may include access to the Internet, an intranet, an IP Multimedia Subsystem (IMS), or packet-switched streaming services.

[0082] Some network devices (such as base stations 105) may include subcomponents, such as access network entities 140, which may be examples of access node controllers (ANCs). Each access network entity 140 may communicate with each UE 115 through one or more other access network transport entities 145, which may be referred to as radio heads, smart radio heads, or transmission / reception points (TRPs). Each access network transport entity 145 may include one or more antenna panels. In some configurations, the various functions of each access network entity 140 or base station 105 may be distributed across various network devices (e.g., radio heads and ANCs) or merged into a single network device (e.g., base station 105).

[0083] The wireless communication system 100 may operate using one or more frequency bands, for example, in the range of 300 megahertz (MHz) to 300 gigahertz (GHz). The 300 MHz to 3 GHz region may be referred to as the ultra-high frequency (UHF) region or decimeter band because the wavelengths range from about 1 decimeter to 1 meter long. UHF waves may be blocked or redirected by buildings and environmental features, but these waves may penetrate various structures sufficiently for macro cells to provide service to UEs 115 located indoors. Transmission of UHF waves may be associated with smaller antennas and shorter ranges (e.g., less than 100 kilometers) than transmission using lower frequencies and longer waves in the high frequency (HF) or very high frequency (VHF) portions of the spectrum below 300 MHz.

[0084] The wireless communication system 100 may utilize both licensed and unlicensed radio frequency spectrum bands. For example, the wireless communication system 100 may employ licensed assisted access (LAA), LTE unlicensed (LTE-U) radio access technology, or NR technology in an unlicensed band (such as the 5 GHz industrial, scientific, and medical (ISM) band). When operating in an unlicensed radio frequency spectrum band, devices (such as base stations 105 and UEs 115) may employ carrier sensing for collision detection and avoidance. In some examples, operations in an unlicensed band may be based on a carrier aggregation configuration (e.g., LAA) in coordination with component carriers operating in a licensed band. Operations in an unlicensed spectrum may include downlink transmissions, uplink transmissions, P2P transmissions, or D2D transmissions, among others.

[0085] The base station 105 or UE 115 may be equipped with multiple antennas, which can be used to employ technologies such as transmit diversity, receive diversity, multiple-input multiple-output (MIMO) communications, or beamforming. The antennas of the base station 105 or UE 115 may be located in one or more antenna arrays or antenna panels that can support MIMO operations or transmit or receive beamforming. For example, one or more base station antennas or antenna arrays may be co-located at an antenna assembly (such as an antenna tower). In some examples, the antennas or antenna arrays associated with the base station 105 may be located at different geographical locations. The base station 105 may have an antenna array having several rows and columns of antenna ports that the base station 105 can use to support beamforming for communications with the UE 115. Similarly, the UE 115 may have one or more antenna arrays that can support various MIMO or beamforming operations. Additionally or alternatively, the antenna panel may support radio frequency beamforming for signals transmitted via the antenna ports.

[0086] The base station 105 or UE 115 can use MIMO communication to utilize multipath signal propagation and improve spectrum efficiency by transmitting or receiving multiple signals via different spatial layers. Such technology may be referred to as spatial multiplexing. For example, the transmitting device may transmit multiple signals via different antennas or different antenna combinations. Similarly, the receiving device may receive multiple signals via different antennas or different antenna combinations. Each of the multiple signals may be referred to as a separate spatial stream and may carry bits associated with the same data stream (e.g., the same codeword) or different data streams (e.g., different codewords). Different spatial layers may be associated with different antenna ports for channel measurement and reporting. MIMO technology includes single-user MIMO (SU-MIMO), in which multiple spatial layers are transmitted to the same receiving device; and multi-user MIMO (MU-MIMO), in which multiple spatial layers are transmitted to multiple devices.

[0087] Beamforming (which may also be referred to as spatial filtering, directional transmission, or directional reception) is a signal processing technique that may be used at a transmitting device or a receiving device (e.g., a base station 105, a UE 115) to shape or steer an antenna beam (e.g., a transmit beam, a receive beam) along a spatial path between the transmitting device and the receiving device. Beamforming may be achieved by combining signals communicated via antenna elements of an antenna array so that some signals propagating at a particular orientation relative to the antenna array experience constructive interference, while other signals experience destructive interference. Adjustments to signals communicated via antenna elements may include the transmitting device or the receiving device applying an amplitude offset, a phase offset, or both to signals carried via antenna elements associated with the device. Adjustments associated with each antenna element may be defined by a set of beamforming weights associated with a particular orientation (e.g., relative to the antenna array of the transmitting device or the receiving device, or relative to some other orientation).

[0088] The base station 105 or the UE 115 may use beam sweeping techniques as part of a beamforming operation. For example, the base station 105 may use multiple antennas or antenna arrays (e.g., antenna panels) to perform beamforming operations for directional communication with the UE 115. Some signals (e.g., synchronization signals, reference signals, beam selection signals, or other control signals) may be transmitted multiple times by the base station 105 in different directions. For example, the base station 105 may transmit signals according to different sets of beamforming weights associated with different transmission directions. Transmissions in different beam directions may be used (e.g., by a transmitting device (such as the base station 105) or a receiving device (such as the UE 115)) to identify a beam direction used by the base station 105 for later transmission or reception.

[0089] Some signals, such as data signals associated with a particular recipient device, may be transmitted by base station 105 in a single beam direction, e.g., a direction associated with a recipient device, such as UE 115. In some examples, a beam direction associated with transmissions along a single beam direction may be determined based on signals transmitted in one or more beam directions. For example, UE 115 may receive one or more signals transmitted by base station 105 in different directions and may report to base station 105 an indication of the signal received by UE 115 with the highest signal quality or other acceptable signal quality.

[0090] In some examples, transmission by a device (e.g., by a base station 105 or a UE 115) may be performed using multiple beam directions, and the device may use a combination of digital precoding or radio frequency beamforming to generate a combined beam for transmission (e.g., from the base station 105 to the UE 105). The UE 115 may report feedback indicating precoding weights for one or more beam directions, and the feedback may correspond to the configured number of beams across the system bandwidth or one or more subbands. The base station 105 may transmit a reference signal (e.g., a cell-specific reference signal (CRS), a channel state information reference signal (CSI-RS)) that may be precoded or uncoded. The UE 115 may provide feedback for beam selection, which may be a precoding matrix indicator (PMI) or codebook-based feedback (e.g., a multi-faceted type codebook, a linear combination type codebook, a port selection type codebook). Although these techniques are described with reference to signals transmitted by base station 105 in one or more directions, UE 115 may use similar techniques to transmit signals multiple times in different directions (e.g., to identify a beam direction for subsequent transmission or reception by UE 115) or to transmit signals in a single direction (e.g., to transmit data to a receiving device).

[0091] A receiving device (e.g., UE 115) may try multiple reception configurations (e.g., directional listening) when receiving various signals (such as synchronization signals, reference signals, beam selection signals, or other control signals) from a base station 105. For example, the receiving device may try multiple reception directions by receiving via different antenna subarrays, processing received signals according to different antenna subarrays, receiving according to different receive beamforming weight sets (e.g., different directional listening weight sets) applied to signals received at multiple antenna elements of an antenna array, or processing received signals according to different receive beamforming weight sets applied to signals received at multiple antenna elements of an antenna array, any of which may be referred to as "listening" according to different reception configurations or reception directions. In some examples, the receiving device may use a single reception configuration to receive along a single beam direction (e.g., when receiving a data signal). The single reception configuration may be aligned on a beam direction determined based on listening according to different reception configuration directions (e.g., a beam direction determined to have the highest signal strength, the highest signal-to-noise ratio (SNR), or other acceptable signal quality based on listening according to multiple beam directions).

[0092] The wireless communication system 100 can be a packet-based network that operates according to a layered protocol stack. In the user plane, the communication of the bearer or packet data convergence protocol (PDCP) layer can be based on IP. The radio link control (RLC) layer can perform packet segmentation and reorganization to communicate on the logical channel. The MAC layer can perform priority handling and multiplex the logical channel into the transport channel. The MAC layer can also use error detection technology, error correction technology, or both to support the retransmission of the MAC layer to improve link efficiency. In the control plane, the RRC protocol layer can provide the establishment, configuration and maintenance of the RRC connection of the radio bearer that supports the user plane data between the UE 115 and the base station 105 or the core network 130. In the physical layer, the transport channel can be mapped to the physical channel.

[0093] In some wireless communication systems 100, UE 115 may perform path loss estimation to support power control for uplink transmissions. Base station 105 may transmit one or more reference signals for path loss estimation to UE 115, and UE 115 may receive the reference signals, measure received powers, and determine path loss estimates based on the received powers. UE 115 may use the determined path loss estimates when determining uplink transmit power for uplink transmissions.

[0094] In some cases, the base station 105 may update a path loss reference signal for power control (e.g., for physical uplink shared channel (PUSCH) transmission, SRS transmission, etc.) via MAC-CE. In a first example, for codebook-based PUSCH transmission, the path loss reference signal may be derived from a downlink reference signal in a spatial relationship associated with an SRS resource indicator (SRI) indicated in a scheduling downlink control information (DCI) message (e.g., if a path loss reference signal is not configured, but a periodic downlink reference signal is configured in a spatial relationship of the SRS). In a second example, the base station 105 may configure the path loss reference signal as a downlink reference signal in a spatial relationship information configuration. In a third example, the base station 105 may use MAC-CE to at least update (e.g., activate, deactivate, or both) a path loss reference signal for PUSCH, SRS, or both. In some cases, the base station 105 may additionally update (e.g., activate, deactivate, or both) other power control parameters (e.g., P0, α, closed-loop process index, etc.) via MAC-CE. For example, the base station 105 may use an SRS activation MAC-CE to activate an SRS power control parameter. In a fourth example, the base station 105 may use a MAC-CE to update a transmission configuration indication (TCI) state of a periodic CSI-RS, where the periodic CSI-RS may be used for path loss reference. In a fifth example, the base station 105 may support a semi-persistent CSI RS for path loss reference.

[0095] Using one or more techniques described herein, base station 105 may update (e.g., activate) path loss reference signals for UE 115. For example, base station 105 may configure a set of path loss reference signals, where a first subset of configured path loss reference signals is "active" and a second subset of configured path loss reference signals is "inactive." According to one or more techniques described herein, UE 115 may use the activated path loss reference signals to measure path loss. Additionally or alternatively, according to one or more techniques described herein, UE 115 may handle the deactivated path loss reference signals.

[0096] Specifically, UE 115 may receive a configuration for a reference signal set for path loss estimation from base station 105, determine a reference signal to be used for path loss estimation from the configured reference signal set, calculate a path loss estimation using the determined reference signal, and transmit an uplink message (to base station 105) according to an uplink transmit power based on the path loss estimation. One or more of these operations may be performed by UE communication manager 101, which may be as described in reference to Figures 5 to 8 Examples of the communication manager 515, 615, 705, or 810 described herein. In some cases, the transceiver may perform receive and transmit operations, and the transmit power controller may determine a path loss estimate and modify the uplink transmit power based on the path loss estimate.

[0097] Accordingly, base station 105 may transmit a configuration for a reference signal set for path loss estimation at UE 115, update (e.g., activate) a reference signal in the configured reference signal set for path loss estimation, transmit the updated (e.g., activated) reference signal to UE 115, and receive an uplink message from UE 115, the uplink message being transmitted at an uplink transmit power based on the path loss measurement for the updated (e.g., activated) reference signal. One or more of these operations may be performed by base station communication manager 102, which may be as described in reference to Figures 9 to 12 Examples of communication managers 915, 1015, 1105, or 1210 are described. In some cases, a transceiver may perform receive and transmit operations, a scheduler may determine a configuration, and an antenna controller may determine reference signals to activate, deactivate, or both (e.g., based on one or more communication beams).

[0098] Figure 2An example of a wireless communication system 200 that supports path loss estimation using path loss reference signal activation and deactivation according to one or more aspects of the present disclosure is illustrated. The wireless communication system 200 may be an example of the wireless communication system 100. The wireless communication system 200 may include a base station 105-a and a UE 115-a, which may be reference signals. Figure 1 Examples of corresponding wireless devices described. Base station 105-a may provide network coverage for geographic coverage area 110-a. Based on one or more path loss reference signals 220 transmitted on downlink channel 205, UE 115-a may perform path loss estimation to determine an uplink transmit power for transmitting uplink message 225 on uplink channel 210. In some cases, UE 115-a may support updating (e.g., activation and deactivation) of path loss reference signals to improve transmit power control.

[0099] In OTA communications, path loss refers to the attenuation of the power of a signal due to one or more effects. For example, free space loss, obstacles, propagation distance, refraction / diffraction / reflection, or any combination of these or other related effects may cause path loss. When selecting a transmit power to be used for transmission, the wireless device may estimate the path loss to accurately determine the corresponding received power at the receiving wireless device. Basing transmit power control at least in part on the path loss estimate may improve the reliability of signal reception.

[0100] In a system implementing beamforming, path loss may depend on the active beam pair used for communication. For example, different beam pairs may result in different signal paths with different path loss values. In order to estimate the path loss, the wireless device may receive a path loss reference signal 220 on the beam pair. For example, in order to measure the uplink path loss, a UE 115 (such as UE 115-a) may receive a path loss reference signal 220 from a base station 105 (such as base station 105-a). The base station 105-a may transmit the path loss reference signal 220 using the downlink transmit beam of the beam pair, and the UE 115-a may receive the path loss reference signal 220 using the downlink receive beam of the beam pair. The beam pair may correspond to a similar or related uplink beam pair. For example, the path loss reference signal 220 may indicate path loss information about the uplink transmit beam at the UE 115-a and the uplink receive beam at the base station 105-a. The uplink transmit beam and the downlink receive beam at UE 115-a may have the same or similar (e.g., within a threshold difference) beam direction, beam width, or both. In some cases, the downlink receive beam may be a relatively wide beam (e.g., compared to the uplink transmit beam), and UE 115-a may select an uplink transmit beam that is encompassed within the beam width of the downlink receive beam. The uplink receive beam and the downlink transmit beam at base station 105-a may also be similar or identical communication beams.

[0101] The base station 105-a may transmit a path loss reference signal 220 using a default transmit power known to both the base station 105-a and the UE 115-a. The UE 115-a may receive the path loss reference signal 220 and may estimate the path loss of the corresponding uplink beam pair based on the RSRP (or similar metric) of the path loss reference signal. That is, by comparing the measured RSRP with the transmit power used by the base station 105-a, the UE 115-a may determine the path loss experienced by the path loss reference signal 220. The path loss reference signal 220 may be an example of a CSI-RS, a synchronization signal block (SSB), or any other downlink reference signal. The UE 115-a may use the measured path loss estimate (as well as other parameters) for uplink transmit power control. For example, based on the path loss estimate, the UE 115-a may select a transmit power and may use the selected transmit power to transmit an uplink message 225 to the base station 105-a. The uplink message 225 may be an example of an uplink data message such as a PUSCH message, an uplink control message such as a Physical Uplink Control Channel (PUCCH) message, an SRS, or any other uplink message 225 .

[0102] The base station 105-a may configure a set of path loss reference signals for the UE 115-a using the configuration 215. In some cases, the base station 105-a may transmit the configuration 215 in an RRC message. For example, during the RRC configuration, the base station 105-a may indicate to the UE 115-a time resources, frequency resources, or both (e.g., specific physical resource blocks (PRBs)) for the UE 115-a to receive reference signals and measure path losses for these reference signals. Such reference signals may be referred to as path loss reference signals or configured path loss reference signals.

[0103] In some cases, the base station 105-a may update the path loss reference signal for the UE 115-a. For example, in a system that implements beamforming (e.g., a system that supports millimeter wave (mmW) communications), each beam change at the base station 105-a, the UE 115-a, or both may result in a change in the channel (and, correspondingly, a change in the path loss). Each path loss reference signal may correspond to a specific beam pair between the UE 115-a and the base station 105-a. Accordingly, changes to the selected beam pair for communication may result in changes to the corresponding reference signal used for path loss estimation. However, updating one or more path loss reference signals using RRC signaling may introduce significant latency (e.g., processing latency at the UE 115-a) to update the path loss reference signal. Alternatively, the base station 105-a may use MAC-CE to change the path loss reference signal. For example, the base station 105-a may transmit a MAC-CE indicating a change to a path loss reference signal to the UE 115-a, and the UE 115-a may process the MAC-CE and identify the change with a shorter processing latency (compared to processing an RRC message). For example, processing a MAC-CE may take up to three milliseconds, while processing an RRC message may take tens of milliseconds. Using the MAC-CE, the base station 105-a may make low latency updates to the path loss reference signal, thereby allowing the UE 115-a to measure the path loss of different beam pairs without significant latency and determine an updated uplink transmit power to transmit on the different beam pairs.

[0104] Updating the path loss reference signal may involve activating and / or deactivating a specific reference signal of the configured path loss reference signal for path loss estimation, modifying a set of configured path loss reference signals, or some combination thereof. For example, UE 115-a may store an indicator (e.g., a variable) in a memory indicating one or more active path loss reference signals (e.g., an identifier of a path loss reference signal tracked by UE 115-a). When base station 105-a uses MAC-CE to update the path loss reference signal, UE 115-a may update the indicator (e.g., a variable) in the memory to indicate one or more updated active path loss reference signals. In this way, base station 105-a and UE 115-a may use MAC-CE to update the path loss reference signal.

[0105] In a first example, configuration 215 may configure a full set of path loss reference signals for UE 115-a (e.g., up to 64 path loss reference signals, or some other number), where a subset of the configured reference signals (e.g., up to four path loss reference signals, or some other number) are active. That is, in some cases, the number of path loss reference signals configured for UE 115-a may be greater than the number of active path loss reference signals (e.g., the maximum number of selected and / or activated path loss reference signals). Having more configured path loss reference signals than active path loss reference signals may support more accurate path loss estimates. In some other cases, the number of path loss reference signals configured for UE 115-a may be equal to the number of active path loss reference signals, which may support low signaling and processing overhead (e.g., because activation / deactivation may not be used). Base station 105-a may transmit active path loss reference signals, and UE 115-a may receive active path loss reference signals to determine path loss estimates for corresponding beam pairs. The base station 105-a may transmit a MAC-CE (or some other message) to activate specific reference signals for path loss estimation and deactivate other reference signals. For example, the UE 115-a may receive the MAC-CE and may "activate" specific reference signals (e.g., identify that the reference signals are active for path loss estimation and receive these active path loss reference signals). In a second example, the configuration 215 may configure a set of active path loss reference signals, and the base station 105-a may use the MAC-CE (or some other message) to update the configured set of active path loss reference signals. The MAC-CE may indicate a reference signal identifier (e.g., an index for a reference signal to be activated, a reference signal to be deactivated, or both), or may indicate specific resources (e.g., time and frequency resources) for the updated reference signals.

[0106] In some cases, UE 115-a may measure path loss using multiple repetitions of active path loss reference signal 220. For example, base station 105-a may transmit path loss reference signal 220 repeatedly according to a periodicity or schedule. UE 115-a may receive multiple repetitions of path loss reference signal 220 (i.e., receive multiple reference signals corresponding to the same path loss reference signal 220 according to a periodicity or schedule), and may perform an averaging technique across the multiple repetitions to determine a path loss estimate. For example, UE 115-a may use L3 filtering on a path loss estimate for a set of reference signal repetitions corresponding to path loss reference signal 220. In some examples, an averaging technique may calculate a single path loss estimate using a set of measured path loss values ​​for a set of received path loss reference signals 220, wherein the most recent path loss value may or may not be emphasized in the calculation. UE 115-a may perform the averaging technique over a specific time duration, a specific number of reference signal repetitions, or a combination thereof. In some cases, a specific time duration, a specific number of repetitions, or both may be preconfigured at the UE 115-a or may be configurable by the base station 105-a. Additionally or alternatively, the specific time duration for the time-averaged path loss estimate may depend on the frequency and / or scheduling of path loss reference signal transmissions by the base station 105-a. The UE 115-a may use the averaged (e.g., L3 filtered) path loss estimate of the activated path loss reference signal to implement uplink transmit power control for uplink message 225 transmission. By performing the averaging technique, the UE 115-a may determine a stable and accurate path loss estimate because averaging mitigates the effects of interference (e.g., bursty interference) on the path loss measurement.

[0107] In some other cases, UE 115-a may measure a single path loss reference signal 220, and may use the single path loss measurement for path loss estimation. In some examples, using a single path loss reference signal 220 may be referred to as using an unfiltered path loss value for transmit power control. Using a single path loss reference signal 220 may reduce processing overhead at UE 115-a (e.g., compared to performing L3 filtering on the path loss estimate). In some cases, using a single path loss reference signal 220 may support low latency processing and transmission because UE 115-a may determine a path loss estimate for an uplink beam pair based on receiving a single path loss reference signal 220 (e.g., rather than converging on a path loss estimate after receiving multiple path loss reference signals 220 for filtering).

[0108] UE 115-a may be provided with a process for handling a disabled path loss reference signal. UE 115-a may be pre-configured or configured by base station 105-a with a process for handling a disabled path loss reference signal. In some cases, UE 115-a may track and / or filter a disabled path loss reference signal 220. For example, base station 105-a may transmit a disabled path loss reference signal 220, and UE 115-a may receive these disabled path loss reference signals 220 and calculate one or more path loss estimates. Tracking disabled path loss reference signals 220 may support low latency transmission updates when switching between beam pairs. For example, if UE 115-a switches beam pairs (and corresponding active path loss reference signals), UE 115-a may have maintained path loss measurements for the path loss reference signal, so UE 115-a can accurately determine the uplink transmit power (e.g., without having to wait for a specific duration for convergence of path loss estimates after activation).

[0109] In some other cases, UE 115-a may not track and / or filter the deactivated path loss reference signal 220. For example, base station 105-a may refrain from transmitting the deactivated path loss reference signal, and UE 115-a may additionally or alternatively refrain from monitoring the deactivated path loss reference signal. Not transmitting and tracking the deactivated path loss reference signal may reduce signaling overhead on downlink channel 205 and may reduce processing overhead for wireless devices (e.g., particularly UE 115-a).

[0110] In some other cases, the UE 115-a may track and / or filter the deactivated path loss reference signal 220 within a set amount of time (or a set number of reference signals) after deactivating the path loss reference signal. For example, upon deactivating the path loss reference signal (e.g., upon receiving an indication from the base station 105-a that the path loss reference signal is deactivated), the UE 115-a may start a timer. In some cases, the base station 105-a may start a corresponding timer. While the timer is running, the base station 105-a may continue to transmit the deactivated path loss reference signal (e.g., according to a periodicity or schedule), and the UE 115-a may continue to receive the deactivated path loss reference signal and calculate the path loss estimate. In some cases, if the deactivated path loss reference signal is reactivated while the timer is running (e.g., the corresponding beam pair is reselected), the UE 115-a may use the maintained path loss estimate for uplink transmit power control. The length of the timer may be configured by the base station 105-a or preconfigured at the UE 115-a.When the timer expires, the base station 105-a may stop transmitting the disabled path loss reference signal and the UE 115-a may stop monitoring the disabled path loss reference signal.

[0111] In some examples, UE 115-a may store the path loss estimate when the path loss reference signal is deactivated. For example, upon receiving an indication (e.g., in a MAC-CE) that the path loss reference signal is deactivated, UE 115-a may store the most recent path loss estimate for the path loss reference signal in a memory. Additionally, UE 115-a may store an indication of a corresponding path loss reference signal, beam pair, or both used for the path loss estimate. If the path loss reference signal is reactivated, UE 115-a may initially use the stored path loss estimate for uplink transmit power control. UE 115-a may further use the reactivated path loss reference signal to update the path loss estimate.

[0112] Figure 3 An example of a wireless communication system 300 that supports path loss estimation using path loss reference signal activation and deactivation according to one or more aspects of the present disclosure is illustrated. The wireless communication system 300 may be an example of a wireless communication system 100 or 200 as described herein. The wireless communication system 300 may include a base station 105-b and a UE 115-b, which may be reference signals. Figure 1 and 2An example of a corresponding wireless device described. The base station 105-b and the UE 115-b may implement beamforming techniques for communication. For example, the UE 115-b may communicate with the base station 105-b using a communication beam 310, which may be an example of an uplink transmit beam, a downlink receive beam, or both. The base station 105-b may also communicate with the UE 115-b using a communication beam (not shown). For example, the base station 105-b may send a transmission 305-a using a first communication beam (e.g., a first downlink transmit beam), send a transmission 305-b using a second communication beam (e.g., a second downlink transmit beam), and send a transmission 305-c using a third communication beam (e.g., a third downlink transmit beam).

[0113] The base station 105-b may configure a path loss reference signal set for the UE 115-b (e.g., using RRC signaling). Additionally or alternatively, the base station 105-b may update the path loss reference signal set for the UE 115-b (e.g., using MAC-CE signaling). For example, the base station 105-b may configure a reference signal set and may activate a specific reference signal in the reference signal set for path loss estimation. In some cases, based on changes in the channel, positioning of the UE, etc., the base station 105-b may activate different path loss reference signals to support path loss estimation for different beam pairs. For example, if UE 115-b is using communication beam 310-a for transmission, base station 105-b may activate path loss reference signal 315-a, if UE 115-b is using communication beam 310-b for transmission, base station 105-b may activate path loss reference signal 315-b, and if UE 115-c is using communication beam 310-c for transmission, base station 105-b may activate path loss reference signal 315-c.

[0114] In some cases, the base station 105-b may activate the first set of path loss reference signals 315 and may deactivate the second set of path loss reference signals 315. The number of active path loss reference signals 315 (or the number of configured path loss reference signals 315) may be based on the beamforming capability of the UE, the antenna configuration of the UE, or both. For example, a UE 115-b that supports lower beam capabilities (e.g., a lower number of communication beams 310, a wider beam, etc.) may be configured with fewer path loss reference signals 315 corresponding to the lower beam capabilities. In some cases, the UE 115-b may transmit an indication of the beam capability of the UE to the base station 105-b, and the base station 105-b may configure the UE 115-b to use the path loss reference signals 315 (e.g., configured path loss reference signals, active path loss reference signals, etc.) based on the beam capability of the UE. A greater number of configured path loss reference signals 315 may correspond to a finer communication beam 310 at UE 115-b, resulting in a more accurate path loss estimate. In some cases, base station 105-b may determine the number of path loss reference signals 315 to configure based on a tradeoff between path loss accuracy and signaling overhead / complexity.

[0115] In some cases, the UE 115-b may concurrently support a number of configured communication beams 310 based on the antenna configuration of the UE. For example, if the UE 115-b has two antenna arrays (e.g., two panels), the UE 115-b may concurrently support two communication beams 310. Accordingly, the base station 105-b may configure two active path loss reference signals 315 for the UE 115-b at a time (e.g., one path loss reference signal 315 per antenna array, per communication beam 310, etc.). However, the base station 105-b may configure more than two path loss reference signals 315 (e.g., potential reference signals that may be used for path loss estimation) for the UE 115-b, such as four, eight, etc. configured path loss reference signals 315. The base station 105-b may switch between the configured path loss reference signals (e.g., using MAC-CE to update, such as activating and / or deactivating different path loss reference signals) to improve the path loss estimation. Different configured path loss reference signals 315 may correspond to different communication beams 310 at UE 115-b. Additionally or alternatively, multiple configured path loss reference signals 315 may correspond to the same communication beam 310 at UE 115-b. For example, base station 105-b may activate and / or deactivate specific path loss reference signals 315 that all indicate path loss for the same communication beam 310-a at UE 115-b to support accurate path loss estimation.

[0116] In some examples, the base station 105-b may configure the UE 115-b with path loss reference signals 315-a, 315-b, and 315-c. However, the UE 115-b may support two active path loss reference signals 315. In some cases, the base station 105-b may activate the path loss reference signals 315-a and 315-b (e.g., using an indication in a MAC-CE). The base station 105-b may transmit the active path loss reference signals 315-a and 315-b to the UE 115-b using the resources configured for the reference signals and periodically. The UE 115-b may receive the active path loss reference signals 315-a and 315-b and may calculate path loss estimates for the corresponding communication beams 310-a and 310-b. In some cases, the UE 115-b may measure the path loss value of a single path loss reference signal 315 and may use the path loss value as a path loss estimate for uplink transmit power control. In some other cases, UE 115-b may measure multiple repetitions of path loss reference signal 315 and may converge on a path loss estimate based on filtering (e.g., averaging) the multiple repetitions. UE 115-b may determine uplink transmit power for communication beams 310-a and 310-b based on measuring active path loss reference signals 315-a and 315-b.

[0117] At a subsequent time, base station 105-b may update path loss reference signal 315. For example, base station 105-b may update (e.g., activate) path loss reference signal 315-c and update (e.g., deactivate) path loss reference signal 315-a. For example, UE 115-b may switch to using communication beam 310-c for uplink transmissions (e.g., based on UE 115-b moving within a cell served by base station 105-b).

[0118] In a first example, when the path loss reference signal 315 is deactivated, the UE 115-b may continue to track and / or filter the deactivated path loss reference signal 315. For example, prior to activation, the base station 105-b may transmit the path loss reference signal 315-c and the UE 115-b may receive the path loss reference signal 315-c (e.g., using a different communication beam 310-c or using the same communication beam 310, such as communication beam 310-b). If such tracking of the path loss reference signal 315-c is maintained, then when the base station 105-b activates the path loss reference signal 315-c, the UE 115-b may have a stored path loss estimate for the path loss reference signal 315-c (due to the continued tracking). In this manner, if UE 115-b implements filtering across a time duration for accurate path loss estimation, UE 115-b may converge on a path loss estimate based on path loss measurements made prior to activating path loss reference signal 315-c. UE 115-b may determine an accurate uplink transmit power based on the path loss estimate after activating path loss reference signal 315-c (e.g., without having to wait an additional time duration after activation of path loss reference signal 315-c to converge on a path loss estimate). Accordingly, maintaining tracking and / or filtering of a deactivated path loss reference signal 315 may support low latency switching of path loss reference signal 315, communication beam 310, or both for uplink transmissions.

[0119] In a second example, when the path loss reference signal 315 is deactivated, the UE 115-b may refrain from tracking and / or filtering the deactivated path loss reference signal 315. For example, the base station 105-b may not transmit the path loss reference signal 315-c before activating the path loss reference signal 315-c. Alternatively, the base station 105-b may transmit the path loss reference signal 315-c before activating the path loss reference signal 315-c at the UE 115-b, but the UE 115-b may not track the deactivated path loss reference signal 315-c. Refraining from tracking the deactivated path loss reference signal 315 may reduce signaling and processing overhead because the base station 105-b may refrain from transmitting the deactivated path loss reference signal 315, the UE 115-b may refrain from processing the deactivated path loss reference signal 315, or both. If UE 115-b implements filtering across a time duration to make accurate path loss estimates, UE 115-b may converge on the path loss estimate after activation of path loss reference signal 315-c and the additional duration. In some cases, to support low latency transmissions after activation of path loss reference signal 315-c, UE 115-b may use unfiltered path loss values ​​for uplink transmit power control prior to convergence, and may subsequently use the path loss estimate converged by UE 115-b for uplink transmit power control (e.g., using filtered path loss values ​​across the time duration). In some cases, UE 115-b may choose whether to implement filtering based on the periodicity or scheduling of path loss reference signal 315 transmissions. For example, UE 115-b may use filtering for relatively frequent (e.g., greater than a threshold frequency) path loss reference signal 315 transmissions, and may not use filtering for relatively infrequent (e.g., less than a threshold frequency) path loss reference signal 315 transmissions. Additionally or alternatively, the UE 115 - b may select a time duration for filtering based on a frequency of path loss reference signal 315 transmissions.

[0120] In a third example, the base station 105-b and the UE 115-b may use a timer to maintain tracking and / or filtering of a deactivated path loss reference signal 315 for a set duration of time. For example, the base station 105-b and the UE 115-b may start running a timer when the path loss reference signal 315-c is activated and the path loss reference signal 315-a is deactivated. While the timer is running, the base station 105-b may transmit the path loss reference signal 315-a and the UE 115-b may receive the path loss reference signal 315-a. If the base station 105-b reactivates the path loss reference signal 315-a before the timer expires, the UE 115-b may maintain the path loss information and may efficiently converge on the path loss estimate of the path loss reference signal 315-a. However, if the timer expires, the base station 105-b may stop transmitting the disabled path loss reference signal 315-a, and the UE 115-b may stop receiving the disabled path loss reference signal 315-a (e.g., to reduce signaling and processing overhead).

[0121] In some systems, the base station 105-b, the UE 115-b, or both may use a decision metric to determine which deactivated path loss reference signals 315 to track. For example, based on the activated path loss reference signals 315, the active communication beams 310, or both, the UE 115-b may determine the deactivated path loss reference signals 315 for which to maintain path loss estimates. For example, the UE 115-b may track and / or filter the deactivated path loss reference signals 315 for communication beams (e.g., downlink transmit beams, uplink receive beams, or both) that are spatially similar to active communication beams (e.g., downlink transmit beams, uplink receive beams, or both), and may otherwise refrain from tracking the deactivated path loss reference signals 315. The decision metric may be based on beam direction, beam width, UE mobility, historical communication information, or any combination of these or other communication parameters.

[0122] Figure 4 An example of a process flow 400 for supporting path loss estimation using path loss reference signal activation and deactivation according to one or more aspects of the present disclosure is illustrated. The process flow 400 may include a base station 105-d and a UE 115-c, which may be as described with reference to FIG. Figures 1 to 3 Examples of corresponding wireless devices described herein. UE 115-c may use active path loss reference signals to calculate path loss estimates for uplink transmit power control. The following alternative examples may be implemented, where some of the processes are performed in a different order than described or not performed at all. In some cases, each process may include additional features not mentioned below, or further processes may be added.

[0123] At 405, the base station 105-c may transmit to the UE 115-c a configuration for a set of reference signals for path loss estimation at the UE 115-c. The base station 105-c may indicate these configured path loss reference signals using an RRC message.

[0124] At 410, the base station 105-c may update (e.g., activate) a reference signal in a set of configured reference signals for path loss estimation. In some cases, updating the reference signal may involve the base station 105-c transmitting a MAC-CE indicating the reference signal to the UE 115-c. The UE 115-c may determine a reference signal to be used for path loss estimation from the set of configured reference signals (e.g., based on an indication of an activated reference signal). In some cases, the UE 115-c may determine a set of active reference signals (e.g., corresponding to multiple communication beams) in the configured reference signals to be used for path loss estimation. The number of active reference signals may be less than or equal to the number of configured reference signals. In some cases, the number of active reference signals, the number of configured reference signals, or both may be based on UE capabilities (e.g., UE beamforming capabilities, UE antenna configuration, etc.) or default values ​​configured at the base station 105-c, the UE 115-c, or both.

[0125] At 415, the base station 105-c may transmit one or more reference signals to the UE 115-c. For example, the base station 105-c may transmit (one or more) activated reference signals to the UE 115-c in the configured resources (e.g., time and frequency resources). The base station 105-c may transmit multiple active reference signals (e.g., multiple repetitions) corresponding to the activated reference signals based on the periodicity (e.g., scheduling) of the activated reference signals. In some cases, the base station 105-c may additionally transmit one or more deactivated reference signals to the UE 115-c. In some other cases, the base station 105-c may refrain from transmitting the deactivated reference signals.

[0126] At 420, the UE 115-c may calculate a path loss estimate using the received one or more reference signals. For example, the UE 115-c may measure a single path loss value and use the single path loss value for the path loss estimate. In other examples, the UE 115-c may measure a set of path loss values ​​based on receiving an active set of reference signals (e.g., a repetition set) corresponding to the activated reference signal and may calculate the path loss estimate using the multiple measurements (e.g., by performing L3 filtering for a threshold duration, a threshold number of repetitions, or both). In some cases, the UE 115-c may track path estimates for deactivated reference signals (e.g., if the base station 105-c transmits the deactivated reference signal).

[0127] At 425, the UE 115-c may transmit an uplink message based on an uplink transmit power based on the calculated path loss estimate (e.g., for one or more activated path loss reference signals). The base station 105-c may receive the uplink message. In some cases, the uplink message may be a PUSCH message or an SRS. By performing the path loss estimate, the UE 115-c may account for signal power attenuation between the UE 115-c and the base station 105-c.

[0128] Although described herein with reference to uplink path loss estimation, it will be understood that the wireless device may perform similar techniques for other types of path loss estimation (e.g., downlink path loss estimation, side link path loss estimation, wireless backhaul path loss estimation, etc.).

[0129] Figure 5 A block diagram 500 of a device 505 supporting path loss estimation using path loss reference signal activation and deactivation according to one or more aspects of the present disclosure is shown. The device 505 may be an example of aspects of a UE 115 as described herein. The device 505 may include a receiver 510, a communication manager 515, and a transmitter 520. The device 505 may also include a processor. Each of these components may be in communication with each other (e.g., via one or more buses).

[0130] Receiver 510 may receive information such as packets, user data, or control information associated with various information channels (e.g., control channels, data channels, and information related to path loss estimation activated and deactivated using path loss reference signals, etc.). The information may be passed to other components of device 505. Receiver 510 may be a reference signal. Figure 8 Examples of aspects of the transceiver 820 are described. The receiver 510 may utilize a single antenna or a collection of antennas.

[0131] In some aspects, the communication manager 515 may receive a configuration for a set of configured reference signals for path loss estimation from a base station, determine a reference signal to be used for path loss estimation from the set of configured reference signals, calculate a path loss estimate using the determined reference signal, and transmit an uplink message based on an uplink transmit power based on the path loss estimate.

[0132] Additionally or alternatively, the communication manager 515 may receive a MAC-CE that updates a first reference signal from the base station, determine a second reference signal (e.g., the same reference signal or a different reference signal) to be used for path loss estimation from a set of configured reference signals based on the updated first reference signal, calculate a path loss estimate using the determined second reference signal, and transmit an uplink message based on an uplink transmit power based on the path loss estimate.

[0133] The actions performed by the communication manager 515 as described herein may be implemented to achieve one or more potential improvements in signaling overhead, signaling latency, or both. For example, determining a reference signal to be used for path loss estimation from a set of configured reference signals may improve path loss estimation. For example, determining to perform path loss estimation on an active reference signal (but not on an inactive reference signal) may maintain accurate path loss estimation while improving signaling overhead and processing latency at the UE 115 (e.g., device 505). Alternatively, performing path loss estimation on a deactivated reference signal may support low latency switching between beam configurations (e.g., by maintaining path loss estimates). Performing filtering on a path loss reference signal may support accurate, robust path loss estimation (e.g., by mitigating the effects of interference), while suppressing performing filtering may support low latency path loss estimation (e.g., by determining a path loss estimate from a single path loss reference signal instance).

[0134] Based on determining the reference signals to be used for path loss estimation, a processor of UE 115 (e.g., a processor controlling receiver 510, communication manager 515, transmitter 520, etc.) can reduce processing resources used for path loss estimation (and correspondingly transmit power control). For example, UE 115 can perform path loss estimation on active reference signals, and in some cases, can suppress path loss estimation on inactive reference signals. In this way, UE 115 can reduce the number of times the processor ramps up processing power and turns on processing units to handle reference signal reception. In addition, reducing the number of active reference signals used for path loss estimation can reduce signaling overhead on downlink channels. Additionally, implementing MAC-CE to activate and deactivate path loss reference signals (e.g., compared to using RRC messaging) can improve the latency involved in activating and deactivating reference signals.

[0135] The communication manager 515 may be an example of aspects of the communication manager 810 described herein. The communication manager 515 or its subcomponents may be implemented in hardware, in code (e.g., software or firmware) executed by a processor, or any combination thereof. If implemented in code executed by a processor, the functions of the communication manager 515 or its subcomponents may be performed by a general purpose processor, a digital signal processor (DSP), an application specific integrated circuit (ASIC), a field programmable gate array (FPGA) or other programmable logic device, discrete gate or transistor logic, discrete hardware components, or any combination thereof designed to perform the functions described in the present disclosure.

[0136] The communication manager 515 or its subcomponents may be physically located at various locations, including being distributed such that portions of the functionality are implemented by one or more physical components at different physical locations. In some examples, according to various aspects of the present disclosure, the communication manager 515 or its subcomponents may be separate and distinct components. The reference signal received by the UE 115-b may be defined as, where is the transmitted reference signal (with a filter), is the channel gain received by the UE 115-b, and noise may also be included in the reference signal received by the UE.

[0137] The transmitter 520 may transmit signals generated by other components of the device 505. In some examples, the transmitter 520 may be co-located with the receiver 510 in a transceiver module. For example, the transmitter 520 may be a reference Figure 8 Examples of aspects of the transceiver 820 are described. The transmitter 520 may utilize a single antenna or a collection of antennas.

[0138] Figure 6 A block diagram 600 of a device 605 supporting path loss estimation using path loss reference signal activation and deactivation according to one or more aspects of the present disclosure is shown. The device 605 may be an example of aspects of the device 505 or UE 115 as described herein. The device 605 may include a receiver 610, a communication manager 615, and a transmitter 640. The device 605 may also include a processor. Each of these components may be in communication with each other (e.g., via one or more buses).

[0139] Receiver 610 may receive information such as packets, user data, or control information associated with various information channels (e.g., control channels, data channels, and information related to path loss estimation activated and deactivated using path loss reference signals, etc.). The information may be passed to other components of device 605. Receiver 610 may be a reference signal. Figure 8 Examples of aspects of the transceiver 820 are described. The receiver 610 may utilize a single antenna or a collection of antennas.

[0140] Communications manager 615 may be an example of aspects of communications manager 515 as described herein. Communications manager 615 may include configuration component 620, reference signal determination component 625, path loss estimation component 630, and transmit power control component 635. Communications manager 615 may be an example of aspects of communications manager 810 as described herein.

[0141] Configuration component 620 can receive a configuration for a set of configured reference signals for path loss estimation from a base station. Reference signal determination component 625 can determine a reference signal to be used for path loss estimation from the set of configured reference signals. Path loss estimation component 630 can calculate a path loss estimate using the determined reference signal. Transmit power control component 635 can transmit an uplink message based on an uplink transmit power based on the path loss estimate.

[0142] The transmitter 640 may transmit signals generated by other components of the device 605. In some examples, the transmitter 640 may be co-located with the receiver 610 in a transceiver module. For example, the transmitter 640 may be a reference Figure 8 Examples of aspects of the transceiver 820 are described. The transmitter 640 may utilize a single antenna or a collection of antennas.

[0143] Figure 7 A block diagram 700 of a communication manager 705 supporting path loss estimation using path loss reference signal activation and deactivation according to one or more aspects of the present disclosure is shown. The communication manager 705 can be an example of aspects of the communication manager 515, the communication manager 615, or the communication manager 810 described herein. The communication manager 705 can include a configuration component 710, a reference signal determination component 715, a path loss estimation component 720, a transmit power control component 725, an activation component 730, a filtering component 735, a non-filtering component 740, a deactivation component 745, a timer component 750, a storage component 755, or any combination thereof. Each of these modules can communicate directly or indirectly with each other (e.g., via one or more buses).

[0144] Configuration component 710 can receive, from a base station, a configuration for a configured set of reference signals for path loss estimation. In some examples, receiving the configuration can involve configuration component 710 receiving an RRC message indicating the configuration.

[0145] The reference signal determination component 715 can determine a reference signal to be used for path loss estimation from a set of configured reference signals. The path loss estimation component 720 can use the determined reference signal to calculate a path loss estimate. The transmit power control component 725 can transmit an uplink message based on an uplink transmit power based on the path loss estimate. In some cases, the uplink message includes an uplink data packet, or an SRS, or both.

[0146] The activation component 730 may update (e.g., activate) the determined reference signal, wherein determining the reference signal to be used for path loss estimation is based on updating the determined reference signal (e.g., based on the determined reference signal being an activated reference signal). In some examples, the activation component 730 may receive a MAC-CE from the base station indicating the reference signal, wherein the updating is based on the MAC-CE. Updating the determined reference signal may involve activating the determined reference signal, wherein determining the reference signal to be used for path loss estimation is based on the determined reference signal being an activated reference signal.

[0147] In some examples, the activation component 730 may receive, from the base station, a set of active reference signals corresponding to the determined reference signal after the updating and based on the determined periodicity of the reference signal. The filtering component 735 may measure a set of path loss values ​​based on receiving the set of active reference signals, wherein the path loss estimate is calculated using the measured set of path loss values. In some examples, the filtering component 735 may perform L3 filtering on the measured set of path loss values, wherein the path loss estimate is calculated based on the L3 filtering. In some examples, the filtering component 735 may determine the set of active reference signals to be received for the path loss estimate based on a threshold number of active reference signals or a threshold duration for measuring the set of path loss values, or both.

[0148] In some other examples, the activation component 730 can receive the determined reference signal from the base station after updating (e.g., activating). The non-filtering component 740 can measure the path loss value based on receiving the determined reference signal, wherein the path loss estimate is calculated using the measured path loss value.

[0149] Deactivating component 745 can update (eg, deactivate) an additional reference signal of the configured set of reference signals based on updating (eg, activating) the reference signal.

[0150] In some examples, deactivation component 745 can receive the additional reference signal from the base station after the deactivation, and can measure an additional path loss value based on receiving the additional reference signal. In some such examples, activation component 730 can further update (e.g., reactivate) the additional reference signal, and can calculate an additional path loss estimate using the measured additional path loss value. Transmit power control component 725 can transmit an additional uplink message based on an additional uplink transmit power based on the additional path loss estimate and based on reactivating the additional reference signal.

[0151] In some other examples, the disabling component 745 can refrain from receiving the additional reference signal after the disabling.

[0152] In yet other examples, the timer component 750 can activate a timer after the deactivation. If the timer is running, the timer component 750 can receive the additional reference signal from the base station after the deactivation. In some examples, the timer component 750 can identify the expiration of the timer and, if the timer is inactive, can refrain from receiving the additional reference signal after the deactivation.

[0153] Storage component 755 can store the additional path loss estimate corresponding to the additional reference signal upon the deactivation. In some examples, activation component 730 can further update (e.g., reactivate) the additional reference signal, and transmit power control component 725 can transmit the additional uplink message according to the additional uplink transmit power based on the stored additional path loss estimate.

[0154] In some examples, determining a reference signal in the configured reference signal set to be used for the path loss estimation may involve the reference signal determination component 715 determining an active reference signal set in the configured reference signal set to be used for the path loss estimation set corresponding to the communication beam set. In some cases, the number of reference signals in the active reference signal set is less than or equal to the number of reference signals in the configured reference signal set. In some examples, the reference signal determination component 715 may transmit an indication of the UE beamforming capability to the base station, wherein the number of reference signals in the configured reference signal set or the number of reference signals in the active reference signal set, or both, is based on the UE beamforming capability.

[0155] In some aspects, the reference signal determination component 715 may receive a MAC-CE from a base station that updates a first reference signal, and may determine a second reference signal to be used for path loss estimation from a set of configured reference signals based on the updated first reference signal. In some examples, if the MAC-CE activates the first reference signal, the first reference signal may be the same as the second reference signal. In some other examples, if the MAC-CE deactivates the first reference signal, the first reference signal may be different from the second reference signal. The path loss estimation component 720 may calculate a path loss estimate using the determined second reference signal. The transmit power control component 725 may transmit an uplink message based on an uplink transmit power based on the path loss estimate.

[0156] Figure 8A diagram of a system 800 including a device 805 supporting path loss estimation using path loss reference signal activation and deactivation according to one or more aspects of the present disclosure is shown. The device 805 may be an example of a device 505, a device 605, or a UE 115 as described herein or include a component of the device 405, the device 505, or the UE 115. The device 805 may include components for two-way voice and data communications, including components for transmitting and receiving communications, including a communication manager 810, an I / O controller 815, a transceiver 820, an antenna 825, a memory 830, and a processor 840. These components may be in electronic communication via one or more buses (e.g., a bus 845).

[0157] The communication manager 810 may receive a configuration for a set of configured reference signals for path loss estimation from a base station, determine a reference signal to be used for path loss estimation from the set of configured reference signals, calculate a path loss estimation using the determined reference signal, and transmit an uplink message based on an uplink transmit power based on the path loss estimation.

[0158] I / O controller 815 can manage input and output signals of device 805. I / O controller 815 can also manage peripheral devices that are not integrated into device 805. In some cases, I / O controller 815 can represent a physical connection or port to an external peripheral device. In some cases, I / O controller 815 can utilize an operating system, such as Or another known operating system. In other cases, I / O controller 815 may represent or interact with a modem, keyboard, mouse, touch screen, or similar device. In some cases, I / O controller 815 may be implemented as part of a processor. In some cases, a user may interact with device 805 via I / O controller 815 or via hardware components controlled by I / O controller 815.

[0159] The transceiver 820 may communicate bidirectionally via one or more antennas, wired or wireless links, as described above. For example, the transceiver 820 may represent a wireless transceiver and may communicate bidirectionally with another wireless transceiver. The transceiver 820 may also include a modem to modulate packets and provide the modulated packets to an antenna for transmission, and demodulate packets received from an antenna.

[0160] In some cases, a wireless device may include a single antenna 825. However, in some cases, the device may have more than one antenna 825, which may be capable of transmitting or receiving multiple wireless transmissions concurrently.

[0161] The memory 830 may include random access memory (RAM) and read-only memory (ROM). The memory 830 may store computer-readable, computer-executable code 835 including instructions that, when executed, cause the processor to perform the various functions described herein. In some cases, the memory 830 may include, among other things, a basic I / O system (BIOS) that may control basic hardware or software operations, such as interaction with peripheral components or devices.

[0162] The processor 840 may include an intelligent hardware device (e.g., a general purpose processor, a DSP, a central processing unit (CPU), a microcontroller, an ASIC, an FPGA, a programmable logic device, a discrete gate or transistor logic component, a discrete hardware component, or any combination thereof). In some cases, the processor 840 may be configured to operate a memory array using a memory controller. In other cases, the memory controller may be integrated into the processor 840. The processor 840 may be configured to execute computer-readable instructions stored in a memory (e.g., memory 830) to cause the device 805 to perform various functions (e.g., functions or tasks of supporting path loss estimation updated with a path loss reference signal using a MAC-CE).

[0163] The code 835 may include instructions for implementing various aspects of the present disclosure, including instructions for supporting wireless communications. The code 835 may be stored in a non-transitory computer-readable medium, such as a system memory or other type of memory. In some cases, the code 835 may not be directly executed by the processor 840, but may cause a computer (e.g., when compiled and executed) to perform the functions described herein.

[0164] Fig. 9 A block diagram 900 of a device 905 supporting path loss estimation using path loss reference signal activation and deactivation according to one or more aspects of the present disclosure is shown. The device 905 may be an example of aspects of a base station 105 as described herein. The device 905 may include a receiver 910, a communication manager 915, and a transmitter 920. The device 905 may also include a processor. Each of these components may be in communication with each other (e.g., via one or more buses).

[0165] Receiver 910 may receive information such as packets, user data, or control information associated with various information channels (e.g., control channels, data channels, and information related to path loss estimation activated and deactivated using path loss reference signals, etc.). The information may be passed to other components of device 905. Receiver 910 may be a reference signal. Fig.12 Examples of various aspects of the transceiver 1220 are described. The receiver 910 may utilize a single antenna or a collection of antennas.

[0166] The communication manager 915 may transmit to a UE a configuration of a configured reference signal set for path loss estimation at the UE, update a reference signal in the configured reference signal set for the path loss estimation, transmit the updated reference signal to the UE, and receive an uplink message from the UE, the uplink message being transmitted at an uplink transmit power based on a path loss measurement for the updated reference signal.

[0167] The actions performed by the communication manager 915 as described herein may be implemented to achieve one or more potential improvements in signaling overhead, signaling latency, or both. For example, updating (e.g., activating) a reference signal for path loss estimation at the UE 115 may improve the path loss estimation. For example, transmitting an activated path loss reference signal (but refraining from transmitting a deactivated path loss reference signal) may support accurate path loss estimation at the UE 115 while reducing signaling overhead and processing latency at the base station 105 (e.g., device 905). Alternatively, transmitting a deactivated path loss reference signal may support low latency switching between beam configurations (e.g., by maintaining a path loss estimate at the UE 115).

[0168] Based on updating (e.g., activating) the reference signal used for path loss estimation, the processor of the base station 105 (e.g., a processor controlling the receiver 910, the communication manager 915, the transmitter 920, etc.) can reduce the processing resources used for path loss estimation. For example, the base station 105 can transmit an active path loss reference signal, and in some cases, can suppress the transmission of an inactive path loss reference signal. In this way, the base station 105 can reduce the number of times the processor ramps up the processing power and turns on the processing unit to handle the reference signal transmission. In addition, reducing the number of active reference signals used for path loss estimation can reduce the signaling overhead on the downlink channel. Additionally, implementing MAC-CE to update (e.g., activate and deactivate) the path loss reference signal (e.g., compared to using RRC messaging) can improve the waiting time involved in activating and deactivating the reference signal.

[0169] The communication manager 915 may be an example of aspects of the communication manager 1210 described herein. The communication manager 915 or its subcomponents may be implemented in hardware, code (e.g., software or firmware) executed by a processor, or any combination thereof. If implemented in code executed by a processor, the functions of the communication manager 915 or its subcomponents may be performed by a general purpose processor, DSP, ASIC, FPGA or other programmable logic device designed to perform the functions described in this disclosure, discrete gate or transistor logic, discrete hardware components, or any combination thereof.

[0170] The communication manager 915 or its subcomponents may be physically located at various locations, including being distributed such that portions of functionality are implemented by one or more physical components at different physical locations. In some examples, according to various aspects of the present disclosure, the communication manager 915 or its subcomponents may be separate and distinct components. In some examples, according to various aspects of the present disclosure, the communication manager 915 or its subcomponents may be combined with one or more other hardware components (including, but not limited to, I / O components, a transceiver, a network server, another computing device, one or more other components described in the present disclosure, or a combination thereof).

[0171] The transmitter 920 may transmit signals generated by other components of the device 905. In some examples, the transmitter 920 may be co-located with the receiver 910 in a transceiver module. For example, the transmitter 920 may be a reference Fig.12 Examples of various aspects of the transceiver 1220 are described. The transmitter 920 may utilize a single antenna or a collection of antennas.

[0172] Fig.10 A block diagram 1000 of a device 1005 supporting path loss estimation using path loss reference signal activation and deactivation according to one or more aspects of the present disclosure is shown. The device 1005 may be an example of aspects of the device 905 or base station 105 as described herein. The device 1005 may include a receiver 1010, a communication manager 1015, and a transmitter 1040. The device 1005 may also include a processor. Each of these components may be in communication with each other (e.g., via one or more buses).

[0173] Receiver 1010 may receive information such as packets, user data, or control information associated with various information channels (e.g., control channels, data channels, and information related to path loss estimation activated and deactivated using path loss reference signals, etc.). The information may be passed to other components of device 1005. Receiver 1010 may be a reference signal. Fig.12 Examples of various aspects of the transceiver 1220 are described. The receiver 1010 may utilize a single antenna or a collection of antennas.

[0174] The communication manager 1015 can be an example of aspects of the communication manager 915 as described herein. The communication manager 1015 can include a configuration component 1020, an activation component 1025, a reference signal component 1030, and a receiving component 1035. The communication manager 1015 can be an example of aspects of the communication manager 1210 described herein.

[0175] Configuration component 1020 may transmit to a UE a configuration for a set of configured reference signals for path loss estimation at the UE. Activation component 1025 may update (e.g., activate) a reference signal for path loss estimation in the set of configured reference signals. Reference signal component 1030 may transmit the updated (e.g., activated) reference signal to the UE. Reception component 1035 may receive an uplink message from the UE, the uplink message transmitted at an uplink transmit power based on a path loss measurement for the updated (e.g., activated) reference signal.

[0176] Transmitter 1040 can transmit signals generated by other components of device 1005. In some examples, transmitter 1040 can be co-located with receiver 1010 in a transceiver module. For example, transmitter 1040 can be a reference Fig.12 Examples of various aspects of the transceiver 1220 are described. The transmitter 1040 may utilize a single antenna or a collection of antennas.

[0177] Fig.11 Block diagram 1100 of a communication manager 1105 supporting path loss estimation using path loss reference signal activation and deactivation according to one or more aspects of the present disclosure is illustrated. The communication manager 1105 can be an example of aspects of the communication manager 915, the communication manager 1015, or the communication manager 1210 described herein. The communication manager 1105 can include a configuration component 1110, an activation component 1115, a reference signal component 1120, a reception component 1125, a deactivation component 1130, a timer component 1135, a UE capability component 1140, or any combination thereof. Each of these modules can communicate directly or indirectly with each other (e.g., via one or more buses).

[0178] Configuration component 1110 can transmit to a UE a configuration for a configured reference signal set for path loss estimation at the UE. In some examples, transmitting the configuration can involve configuration component 1110 transmitting an RRC message indicating the configuration.

[0179] The activation component 1115 may update a reference signal in the configured reference signal set for the path loss estimation. In some examples, updating the reference signal may involve the activation component 1115 transmitting a MAC-CE indicating the reference signal to the UE. In some examples, updating the reference signal may involve activating the reference signal.

[0180] The reference signal component 1120 can transmit the updated (e.g., activated) reference signal to the UE. The receiving component 1125 can receive an uplink message from the UE, the uplink message being transmitted at an uplink transmit power based on the path loss measurement for the updated (e.g., activated) reference signal. In some cases, the uplink message includes an uplink data packet, or an SRS, or both.

[0181] In some examples, transmitting an updated (e.g., activated) reference signal may involve reference signal component 1120 transmitting an active reference signal set corresponding to the updated (e.g., activated) reference signal to the UE after the update and based on the periodicity of the updated (e.g., activated) reference signal, wherein the uplink transmit power is based on a path loss measurement set of the active reference signal set.

[0182] In some cases, deactivation component 1130 can transmit a deactivated reference signal from the configured reference signal set to the UE. In some examples, activation component 1115 can update (e.g., activate) the deactivated reference signal for path loss estimation, and receiving component 1125 can receive an additional uplink message from the UE based on an additional uplink transmit power based on the additional path loss measurement for the deactivated reference signal.

[0183] In some other cases, disabling component 1130 can refrain from transmitting disabled reference signals in the configured reference signal set.

[0184] In still other cases, the deactivation component 1130 can update (e.g., deactivate) an additional reference signal in the configured reference signal set for path loss estimation. The timer component 1135 can activate a timer after the deactivation, and if the timer is running, can transmit the additional reference signal to the UE after the deactivation. In some examples, the timer component 1135 can identify the expiration of the timer, and if the timer is inactive, can refrain from transmitting the additional reference signal after the deactivation.

[0185] In some examples, the activation component 1115 can update (e.g., activate) a reference signal set in the configured reference signal set to be used for the path loss estimation set corresponding to the communication beam set. In some cases, the number of reference signals in the activated reference signal set is less than or equal to the number of reference signals in the configured reference signal set.

[0186] The UE capability component 1140 may receive an indication of UE beamforming capabilities from the UE and may determine the configuration based on the UE beamforming capabilities.

[0187] Fig.12A diagram of a system 1200 including a device 1205 supporting path loss estimation using path loss reference signal activation and deactivation according to one or more aspects of the present disclosure is shown. The device 1205 may be an example of a device 905, a device 1005, or a base station 105 as described herein or include components of the above devices. The device 1205 may include components for two-way voice and data communications, including components for transmitting and receiving communications, including a communication manager 1210, a network communication manager 1215, a transceiver 1220, an antenna 1225, a memory 1230, a processor 1240, and an inter-station communication manager 1245. These components may be in electronic communication via one or more buses (e.g., a bus 1250).

[0188] The communication manager 1210 may transmit to a UE a configuration of a configured reference signal set for path loss estimation at the UE, update a reference signal in the configured reference signal set for the path loss estimation, transmit an updated (e.g., activated) reference signal to the UE, and receive an uplink message from the UE, the uplink message being transmitted with an uplink transmit power based on a path loss measurement for the updated (e.g., activated) reference signal.

[0189] The network communications manager 1215 may manage communications with the core network 130 (eg, via one or more wired backhaul links). For example, the network communications manager 1215 may manage the delivery of data communications for client devices, such as one or more UEs 115.

[0190] The transceiver 1220 may communicate bidirectionally via one or more antennas, wired or wireless links, as described above. For example, the transceiver 1220 may represent a wireless transceiver and may communicate bidirectionally with another wireless transceiver. The transceiver 1220 may also include a modem to modulate packets and provide the modulated packets to an antenna for transmission, and demodulate packets received from an antenna.

[0191] In some cases, a wireless device may include a single antenna 1225. However, in some cases, the device may have more than one antenna 1225, which may be capable of transmitting or receiving multiple wireless transmissions concurrently.

[0192] The memory 1230 may include RAM, ROM, or a combination thereof. The memory 1230 may store computer readable code 1235 including instructions that, when executed by a processor (e.g., processor 1240), cause the device to perform various functions described herein. In some cases, the memory 1230 may include, among other things, a BIOS that may control basic hardware or software operations, such as interaction with peripheral components or devices.

[0193] Processor 1240 may include an intelligent hardware device (e.g., a general purpose processor, a DSP, a CPU, a microcontroller, an ASIC, an FPGA, a programmable logic device, a discrete gate or transistor logic component, a discrete hardware component, or any combination thereof). In some cases, processor 1240 may be configured to operate a memory array using a memory controller. In some cases, the memory controller may be integrated into processor 1240. Processor 1240 may be configured to execute computer-readable instructions stored in a memory (e.g., memory 1230) to cause device 1205 to perform various functions (e.g., functions or tasks of supporting path loss estimation updated with a path loss reference signal using MAC-CE).

[0194] The inter-site communication manager 1245 may manage communications with other base stations 105 and may include a controller or scheduler for controlling communications with UE 115 in cooperation with other base stations 105. For example, the inter-site communication manager 1245 may coordinate the scheduling of transmissions to UE 115 for various interference mitigation techniques, such as beamforming or joint transmission. In some examples, the inter-site communication manager 1245 may provide an X2 interface within an LTE / LTE-A wireless communication network technology to provide communications between base stations 105.

[0195] The code 1235 may include instructions for implementing various aspects of the present disclosure, including instructions for supporting wireless communications. The code 1235 may be stored in a non-transitory computer-readable medium, such as a system memory or other type of memory. In some cases, the code 1235 may not be directly executed by the processor 1240, but may cause a computer (e.g., when compiled and executed) to perform the functions described herein.

[0196] Fig.13 A flow chart illustrating a method 1300 for supporting path loss estimation using path loss reference signal activation and deactivation according to one or more aspects of the present disclosure is shown. The operations of the method 1300 may be implemented by a UE 115 or a component thereof as described herein. For example, the operations of the method 1300 may be implemented by a UE 115 or a component thereof as described herein. Figures 5 to 8 In some examples, the UE may execute an instruction set to control the functional elements of the UE to perform the functions described below. Additionally or alternatively, the UE may use dedicated hardware to perform various aspects of the functions described below.

[0197] At 1305, the UE may receive a configuration for a configured reference signal set for path loss estimation from a base station. The operations of 1305 may be performed according to the methods described herein. In some examples, aspects of the operations of 1305 may be performed as described with reference to Figures 5 to 8 Describes the configuration components to execute.

[0198] At 1310, the UE may determine a reference signal to be used for the path loss estimation from a configured reference signal set. The operations of 1310 may be performed according to the methods described herein. In some examples, aspects of the operations of 1310 may be performed as described with reference to Figures 5 to 8 The reference signal determination component described is performed.

[0199] At 1315, the UE may use the determined reference signal to calculate a path loss estimate. The operations of 1315 may be performed according to the methods described herein. In some examples, aspects of the operations of 1315 may be performed as described with reference to Figures 5 to 8 The path loss estimation component described is performed.

[0200] At 1320, the UE may transmit an uplink message according to an uplink transmit power based on the path loss estimate. The operations of 1320 may be performed according to the methods described herein. In some examples, aspects of the operations of 1320 may be performed as described with reference to Figures 5 to 8 The transmit power control component described is used to perform.

[0201] Fig.14 A flow chart illustrating a method 1400 for supporting path loss estimation using path loss reference signal activation and deactivation according to one or more aspects of the present disclosure is shown. The operations of the method 1400 may be implemented by a UE 115 or a component thereof as described herein. For example, the operations of the method 1400 may be implemented by a UE 115 or a component thereof as described herein. Figures 5 to 8 In some examples, the UE may execute an instruction set to control the functional elements of the UE to perform the following functions. Additionally or alternatively, the UE may use dedicated hardware to perform various aspects of the following functions.

[0202] At 1405, the UE may receive a configuration for a reference signal set for path loss estimation from a base station. The operations of 1405 may be performed according to the methods described herein. In some examples, aspects of the operations of 1405 may be performed as described with reference to Figures 5 to 8 Describes the configuration components to execute.

[0203] At 1410, the UE may receive a MAC CE indicating a reference signal from the base station. The operations of 1410 may be performed according to the methods described herein. In some examples, aspects of the operations of 1410 may be performed as described with reference to Figures 5 to 8 Described activation components to execute.

[0204] At 1415, the UE may update (eg, activate) the reference signal indicated by the MAC-CE. The operations of 1415 may be performed according to the methods described herein. In some examples, aspects of the operations of 1415 may be performed as described with reference to Figures 5 to 8 Described activation components to execute.

[0205] At 1420, the UE may determine a reference signal to be used for the path loss estimation from the configured reference signal set, wherein the reference signal to be used for the path loss estimation is determined based on the determined reference signal being an updated (e.g., activated) reference signal. The operations of 1420 may be performed according to the methods described herein. In some examples, aspects of the operations of 1420 may be performed as described with reference to Figures 5 to 8 The reference signal determination component described is performed.

[0206] At 1425, the UE may use the determined reference signal to calculate a path loss estimate. The operations of 1425 may be performed according to the methods described herein. In some examples, aspects of the operations of 1425 may be performed as described with reference to Figures 5 to 8 The path loss estimation component described is performed.

[0207] At 1430, the UE may transmit an uplink message according to an uplink transmit power based on the path loss estimate. The operations of 1430 may be performed according to the methods described herein. In some examples, aspects of the operations of 1430 may be performed as described with reference to Figures 5 to 8 The transmit power control component described is used to perform.

[0208] Fig.15 A flow chart illustrating a method 1500 for supporting path loss estimation using path loss reference signal activation and deactivation according to one or more aspects of the present disclosure is shown. The operations of the method 1500 may be implemented by a UE 115 or a component thereof as described herein. For example, the operations of the method 1500 may be implemented by a UE 115 or a component thereof as described herein. Figures 5 to 8 In some examples, the UE may execute an instruction set to control the functional elements of the UE to perform the following functions. Additionally or alternatively, the UE may use dedicated hardware to perform various aspects of the following functions.

[0209] At 1505, the UE may receive a configuration for a reference signal set for path loss estimation from a base station. The operations of 1505 may be performed according to the methods described herein. In some examples, aspects of the operations of 1505 may be performed as described with reference to Figures 5 to 8 Describes the configuration components to execute.

[0210] At 1510, the UE may update (eg, activate) a reference signal. The operations of 1510 may be performed according to the methods described herein. In some examples, aspects of the operations of 1510 may be performed as described with reference to Figures 5 to 8 Described activation components to execute.

[0211] At 1515, the UE may update (e.g., deactivate) an additional reference signal of the configured reference signal set (e.g., based on activating the reference signal). The operations of 1515 may be performed according to the methods described herein. In some examples, aspects of the operations of 1515 may be performed as described with reference to Figures 5 to 8 Deactivate the component described.

[0212] At 1520, the UE may determine a reference signal to be used for the path loss estimation from the configured reference signal set, wherein the reference signal to be used for the path loss estimation is determined based on the determined reference signal being an activated reference signal. The operations of 1520 may be performed according to the methods described herein. In some examples, aspects of the operations of 1520 may be performed as described with reference to Figures 5 to 8 The reference signal determination component described is performed.

[0213] At 1525, the UE may receive the determined reference signal from the base station after the activation. The operations of 1525 may be performed according to the methods described herein. In some examples, aspects of the operations of 1525 may be performed as described with reference to Figures 5 to 8 Described activation components to execute.

[0214] At 1530, the UE may measure a path loss value based on receiving the determined reference signal, wherein the path loss estimate is calculated using the measured path loss value. The operations of 1530 may be performed according to the methods described herein. In some examples, aspects of the operations of 1530 may be performed as described with reference to Figures 5 to 8 The non-filtering components described are performed.

[0215] At 1535, the UE may receive the additional reference signal from the base station after the deactivation. The operations of 1535 may be performed according to the methods described herein. In some examples, aspects of the operations of 1535 may be performed as described with reference to Figures 5 to 8 Deactivate the component described.

[0216] At 1540, the UE may measure an additional path loss value based on receiving the additional reference signal (ie, the deactivated reference signal). The operations of 1540 may be performed according to the methods described herein. In some examples, aspects of the operations of 1540 may be performed as described with reference to Figures 5 to 8 Deactivate the component described.

[0217] At 1545, the UE may use the determined reference signal (e.g., the measured path loss value of the determined reference signal) to calculate the path loss estimate. The operations of 1545 may be performed according to the methods described herein. In some examples, aspects of the operations of 1545 may be performed as described with reference to Figures 5 to 8 The path loss estimation component described is performed.

[0218] At 1550, the UE may transmit an uplink message according to an uplink transmit power based on the path loss estimate. The operations of 1550 may be performed according to the methods described herein. In some examples, aspects of the operations of 1550 may be performed as described with reference to Figures 5 to 8 The transmit power control component described is used to perform.

[0219] Fig.16 A flow chart illustrating a method 1600 for supporting path loss estimation using path loss reference signal activation and deactivation according to one or more aspects of the present disclosure is shown. The operations of the method 1600 may be implemented by a base station 105 or components thereof as described herein. For example, the operations of the method 1600 may be implemented by a base station 105 or components thereof as described herein. Figures 9 to 12 In some examples, the base station may execute an instruction set to control the functional elements of the base station to perform the functions described below. Additionally or alternatively, the base station may use dedicated hardware to perform various aspects of the functions described below.

[0220] At 1605, the base station may transmit to the UE a configuration of a configured reference signal set for path loss estimation at the UE. The operations of 1605 may be performed according to the methods described herein. In some examples, aspects of the operations of 1605 may be performed as described with reference to Figures 9 to 12 Describes the configuration components to execute.

[0221] At 1610, the base station may update (eg, activate) a reference signal in a configured reference signal set for path loss estimation. The operations of 1610 may be performed according to the methods described herein. In some examples, aspects of the operations of 1610 may be performed as described with reference to Figures 9 to 12 Described activation components to execute.

[0222] At 1615, the base station may transmit an updated (eg, activated) reference signal to the UE. The operations of 1615 may be performed according to the methods described herein. In some examples, aspects of the operations of 1615 may be performed as described with reference to Figures 9 to 12 The reference signal components described are implemented.

[0223] At 1620, the base station may receive an uplink message from the UE, the uplink message being transmitted at an uplink transmit power based on a path loss measurement for an updated (e.g., activated) reference signal. The operations of 1620 may be performed according to the methods described herein. In some examples, aspects of the operations of 1620 may be performed as described with reference to Figures 9 to 12 The receiving component described here is executed.

[0224] Fig.17A flow chart illustrating a method 1700 for supporting path loss estimation using path loss reference signal activation and deactivation according to one or more aspects of the present disclosure is shown. The operations of the method 1700 may be implemented by a UE 115 or a component thereof as described herein. For example, the operations of the method 1700 may be implemented by a UE 115 or a component thereof as described herein. Figures 5 to 8 In some examples, the UE may execute an instruction set to control the functional elements of the UE to perform the following functions. Additionally or alternatively, the UE may use dedicated hardware to perform various aspects of the following functions.

[0225] At 1705, the UE may receive a MAC-CE for updating a first reference signal from a base station. The operations of 1705 may be performed according to the methods described herein. In some examples, aspects of the operations of 1705 may be performed as described with reference to Figures 5 to 8 The reference signal determination component described is performed.

[0226] At 1710, the UE may determine a second reference signal to be used for path loss estimation from a set of configured reference signals based on the updated first reference signal. The operations of 1710 may be performed according to the methods described herein. In some examples, aspects of the operations of 1710 may be performed as described with reference to Figures 5 to 8 The reference signal determination component described is performed.

[0227] At 1715, the UE may use the determined second reference signal to calculate a path loss estimate. The operations of 1715 may be performed according to the methods described herein. In some examples, aspects of the operations of 1715 may be performed as described with reference to Figures 5 to 8 The path loss estimation component described is performed.

[0228] At 1720, the UE may transmit an uplink message according to an uplink transmit power based on the path loss estimate. The operations of 1720 may be performed according to the methods described herein. In some examples, aspects of the operations of 1720 may be as described with reference to Figures 5 to 8 The transmit power control component described is used to perform.

[0229] It should be noted that the methods described herein describe possible implementations, and that the operations may be rearranged or otherwise modified and other implementations are possible. Furthermore, aspects from two or more methods may be combined.

[0230] The following examples are given by way of illustration. Aspects of the following examples may be combined with aspects shown or discussed elsewhere in the drawings or in this document.

[0231] Example 1: A method for wireless communication at a UE, comprising: receiving a configuration for multiple configured reference signals for path loss estimation from a base station; determining a reference signal to be used for the path loss estimation from the multiple configured reference signals; calculating a path loss estimate using the determined reference signal; and transmitting an uplink message based on an uplink transmit power based at least in part on the path loss estimate.

[0232] Example 2: The method of Example 1 further comprises: updating the determined reference signal, wherein determining the reference signal to be used for the path loss estimation is based at least in part on updating the determined reference signal.

[0233] Example 3: A method as in Example 2, wherein: updating the determined reference signal includes activating the determined reference signal; and determining the reference signal to be used for the path loss estimation is at least partially based on the determined reference signal being an activated reference signal.

[0234] Example 4: The method of any one of Examples 2 or 3 further comprises: receiving a MAC-CE indicating the reference signal from the base station, wherein the updating is based at least in part on the MAC-CE.

[0235] Example 5: A method as in any of Examples 2-4, further comprising: receiving multiple active reference signals corresponding to the determined reference signal from the base station after the updating and at least partially based on the periodicity of the determined reference signal; and measuring multiple path loss values ​​based at least partially on receiving the multiple active reference signals, wherein the path loss estimate is calculated using the measured multiple path loss values.

[0236] Example 6: The method of Example 5 further comprises: performing L3 filtering on the measured plurality of path loss values, wherein the path loss estimate is calculated based at least in part on the L3 filtering.

[0237] Example 7: A method as in either Example 5 or 6, further comprising: determining a plurality of active reference signals to be received for the path loss estimation based at least in part on a threshold number of active reference signals or a threshold duration for measuring the plurality of path loss values, or both.

[0238] Example 8: A method as in any of Examples 2-7, further comprising: receiving a determined reference signal from the base station after the update; and measuring a path loss value based at least in part on receiving the determined reference signal, wherein the path loss estimate is calculated using the measured path loss value.

[0239] Example 9: The method of any of Examples 2-8, further comprising: updating an additional reference signal in the plurality of configured reference signals based at least in part on updating the determined reference signal, wherein updating the additional reference signal comprises deactivating the additional reference signal.

[0240] Example 10: The method of Example 9 further includes: receiving the additional reference signal from the base station after the deactivation; and measuring an additional path loss value based at least in part on receiving the additional reference signal.

[0241] Example 11: The method of Example 10 further includes: further updating the additional reference signal, wherein further updating the additional reference signal includes reactivating the additional reference signal; calculating an additional path loss estimate using the measured additional path loss value; and transmitting an additional uplink message based at least in part on the additional path loss estimate and the additional uplink transmit power of the reactivation of the additional reference signal.

[0242] Example 12: The method of Example 9 further comprises: suppressing receiving the additional reference signal after the deactivation.

[0243] Example 13: The method as in Example 9 further includes: activating a timer after the deactivation; if the timer is running, receiving the additional reference signal from the base station after the deactivation; identifying the expiration of the timer; and if the timer is inactive, suppressing the reception of the additional reference signal after the deactivation.

[0244] Example 14: A method as in any of Examples 9-13, further comprising: storing an additional path loss estimate corresponding to the additional reference signal at the time of the deactivation; further updating the additional reference signal, wherein further updating the additional reference signal comprises reactivating the additional reference signal; and transmitting an additional uplink message based at least in part on the stored additional path loss estimate and the additional uplink transmit power of the reactivation of the additional reference signal.

[0245] Example 15: A method as in any one of Examples 1-14, wherein determining a reference signal from among the multiple configured reference signals to be used for the path loss estimation comprises: determining a plurality of active reference signals from among the multiple configured reference signals to be used for a plurality of path loss estimates corresponding to a plurality of communication beams.

[0246] Example 16: The method of Example 15, wherein the number of reference signals in the plurality of active reference signals is less than or equal to the number of reference signals in the plurality of configured reference signals.

[0247] Example 17: The method of any one of Examples 15 or 16 further includes: transmitting an indication of UE beamforming capability to the base station, wherein the number of reference signals in the multiple configured reference signals or the number of reference signals in the multiple active reference signals, or both, is at least partially based on the UE beamforming capability.

[0248] Example 18: The method of any of Examples 1-17, wherein receiving the configuration comprises: receiving an RRC message indicating the configuration.

[0249] Example 19: The method of any of Examples 1-18, wherein the uplink message comprises an uplink data packet, or an SRS, or both.

[0250] Example 20: A method for wireless communication at a base station, comprising: transmitting to a UE a configuration of multiple configured reference signals for path loss estimation at the UE; updating a reference signal used for the path loss estimation among the multiple configured reference signals; transmitting the updated reference signal to the UE; and receiving an uplink message from the UE, the uplink message being transmitted with an uplink transmit power based at least in part on a path loss measurement for the updated reference signal.

[0251] Example 21: The method of Example 20, wherein updating the reference signal comprises: transmitting a MAC-CE indicating the reference signal to the UE.

[0252] Example 22: The method of any of Examples 20 or 21, wherein updating the reference signal comprises activating the reference signal.

[0253] Example 23: A method as in any of Examples 20-22, wherein transmitting an updated reference signal comprises: transmitting a plurality of active reference signals corresponding to the updated reference signal to the UE after the update and based at least in part on the periodicity of the updated reference signal, wherein the uplink transmit power is based at least in part on a plurality of path loss measurements of the plurality of active reference signals.

[0254] Example 24: The method of any one of Examples 20-23, further comprising: transmitting a deactivated reference signal of the plurality of configured reference signals to the UE.

[0255] Example 25: The method as in Example 24 further includes: updating a deactivated reference signal used for the path loss estimation, wherein updating the deactivated reference signal includes activating the deactivated reference signal; and receiving an additional uplink message from the UE based on an additional uplink transmit power based at least in part on an additional path loss measurement for the deactivated reference signal.

[0256] Example 26: The method of any of Examples 20-23, further comprising: refraining from transmitting a disabled reference signal of the plurality of configured reference signals.

[0257] Example 27: A method as in any one of Examples 20-23, further comprising: updating an additional reference signal among the multiple configured reference signals for the path loss estimation, wherein updating the additional reference signal comprises deactivating the additional reference signal; activating a timer after the deactivation; transmitting the additional reference signal to the UE after the deactivation if the timer is running; identifying the expiration of the timer; and suppressing transmission of the additional reference signal after the deactivation if the timer is inactive.

[0258] Example 28: The method of any one of Examples 20-27 further comprises: updating multiple reference signals among the multiple configured reference signals for multiple path loss estimates corresponding to multiple communication beams, wherein updating the multiple reference signals comprises activating the multiple reference signals.

[0259] Example 29: The method of Example 28, wherein the number of reference signals in the plurality of activated reference signals is less than or equal to the number of reference signals in the plurality of configured reference signals.

[0260] Example 30: A method as in any of Examples 20-29, further comprising: receiving an indication of UE beamforming capabilities from the UE; and determining the configuration based at least in part on the UE beamforming capabilities.

[0261] Example 31: The method of any of Examples 20-30, wherein transmitting the configuration comprises: transmitting an RRC message indicating the configuration.

[0262] Example 32: The method of any of Examples 20-31, wherein the uplink message comprises an uplink data packet, or an SRS, or both.

[0263] Example 33: A method for wireless communication at a UE, comprising: receiving a MAC-CE that updates a first reference signal from a base station; determining a second reference signal to be used for path loss estimation from a plurality of configured reference signals based at least in part on the updated first reference signal; calculating a path loss estimate using the determined second reference signal; and transmitting an uplink message based on an uplink transmit power based at least in part on the path loss estimate.

[0264] Example 34: The method of Example 33, wherein: the MAC-CE activates the first reference signal, and the first reference signal is the same as the second reference signal; or the MAC-CE deactivates the first reference signal, and the first reference signal is different from the second reference signal.

[0265] Example 35: An apparatus for wireless communication, comprising a processor; and a memory coupled to the processor, the processor and the memory configured to perform the method of any one of Examples 1 to 19.

[0266] Example 36: An apparatus for wireless communication, comprising a processor; and a memory coupled to the processor, the processor and the memory configured to perform the method of any one of Examples 20 to 32.

[0267] Example 37: An apparatus for wireless communication, comprising a processor; and a memory coupled to the processor, the processor and the memory configured to perform the method of any of Examples 33 or 34.

[0268] Example 38: An apparatus comprising: at least one device for performing the method of any one of Examples 1 to 19.

[0269] Example 39: An apparatus comprising: at least one device for performing the method of any one of Examples 20 to 32.

[0270] Example 40: An apparatus comprising: at least one device for performing the method of any of Examples 33 or 34.

[0271] Example 41: A non-transitory computer-readable medium storing code for wireless communication, the code comprising instructions executable by a processor to perform the method of any of Examples 1 to 19.

[0272] Example 42: A non-transitory computer-readable medium storing code for wireless communication, the code comprising instructions executable by a processor to perform the method of any of Examples 20 to 32.

[0273] Example 43: A non-transitory computer-readable medium storing code for wireless communication, the code comprising instructions executable by a processor to perform the method of any of Examples 33 or 34.

[0274] Although aspects of LTE, LTE-A, LTE-A Pro, or NR systems may be described for example purposes, and LTE, LTE-A, LTE-A Pro, or NR terminology may be used in much of the description, the techniques described herein may also be applicable to networks other than LTE, LTE-A, LTE-A Pro, or NR networks. For example, the techniques described may be applied to various other wireless communication systems, such as Ultra Mobile Broadband (UMB), Institute of Electrical and Electronics Engineers (IEEE) 802.11 (Wi-Fi), IEEE 802.16 (WiMAX), IEEE 802.20, Flash-OFDM, and other systems and radio technologies not explicitly mentioned herein.

[0275] The information and signals described herein may be represented using any of a variety of different techniques and technologies. For example, data, instructions, commands, information, signals, bits, symbols, and chips that may be referred to throughout this description may be represented by voltages, currents, electromagnetic waves, magnetic fields or particles, optical fields or particles, or any combination thereof.

[0276] The various illustrative blocks and components described in conjunction with the disclosure herein may be implemented or performed with a general purpose processor, a DSP, an ASIC, a CPU, an FPGA or other programmable logic device, discrete gate or transistor logic, discrete hardware components, or any combination thereof designed to perform the functions described herein. A general purpose processor may be a microprocessor, but in the alternative, the processor may be any processor, controller, microcontroller, or state machine. The processor may also be implemented as a combination of computing devices (e.g., a combination of a DSP and a microprocessor, a plurality of microprocessors, one or more microprocessors in conjunction with a DSP core, or any other such configuration).

[0277] The functions described herein may be implemented in hardware, software executed by a processor, firmware, or any combination thereof. If implemented in software executed by a processor, the functions may be stored on or transmitted by a computer-readable medium as one or more instructions or codes. Other examples and implementations fall within the scope of the present disclosure and the appended claims. For example, due to the nature of software, the functions described herein may be implemented using software executed by a processor, hardware, firmware, hardwiring, or any combination thereof. Features that implement the functions may also be physically located in various locations, including being distributed so that parts of the functions are implemented at different physical locations.

[0278] Computer-readable medium includes both non-transient computer storage medium and communication medium, and it includes any medium that facilitates computer program to transfer from one place to another place.Non-transient storage medium can be any available medium that can be accessed by general or special-purpose computer.As an example and not limitation, non-transient computer-readable medium can include RAM, ROM, electrically erasable programmable ROM (EEPROM), flash memory, compact disk (CD) ROM or other optical disk storage, disk storage or other magnetic storage device, or can be used to carry or store instruction or data structure form of desired program code means and can be accessed by general or special-purpose computer or general or special-purpose processor any other non-transient medium.Similarly, any connection is also properly referred to as computer-readable medium.For example, if software is transmitted from website, server or other remote source using coaxial cable, optical fiber cable, twisted pair, digital subscriber line (DSL) or wireless technology such as infrared, radio and microwave, then this coaxial cable, optical fiber cable, twisted pair, DSL or wireless technology such as infrared, radio and microwave are just included in the definition of computer-readable medium. Disk and disc as used herein include CDs, laser discs, optical discs, digital versatile discs (DVDs), floppy disks, and Blu-ray discs, where disks usually reproduce data magnetically, while discs reproduce data optically with lasers. Combinations of the above are also included within the scope of computer-readable media.

[0279] As used herein (including in the claims), "or" used in a list of items (e.g., a list of items with a phrase such as "at least one of" or "one or more of") indicates an inclusive list, so that, for example, a list of at least one of A, B, or C means A or B or C or AB or AC or BC or ABC (i.e., A and B and C). Similarly, as used herein, the phrase "based on" should not be interpreted as referring to a closed set of conditions. For example, an example operation described as "based on condition A" may be based on both condition A and condition B without departing from the scope of the present disclosure. In other words, as used herein, the phrase "based on" should be interpreted in the same manner as the phrase "based at least in part on."

[0280] In the accompanying drawings, similar components or features may have the same reference number. In addition, various components of the same type may be distinguished by following the reference number with a dash and a second reference number that distinguishes between similar components. If only the first reference number is used in the specification, the description may apply to any of the similar components having the same first reference number regardless of the second reference number, or other subsequent reference numbers.

[0281] The descriptions set forth herein in conjunction with the accompanying drawings describe example configurations and do not represent all examples that can be implemented or fall within the scope of the claims. The term "example" as used herein means "used as an example, instance, or illustration" and does not mean "better than" or "better than other examples." This detailed description includes specific details to provide an understanding of the described techniques. However, these techniques may be practiced without these specific details. In some instances, known structures and devices are shown in block diagram form to avoid obscuring the concepts of the described examples.

[0282] The description herein is provided to enable those skilled in the art to make or use the present disclosure. Various modifications to the present disclosure will be apparent to those skilled in the art, and the universal principles defined herein may be applied to other variations without departing from the scope of the present disclosure. Thus, the present disclosure is not limited to the examples and designs described herein, but should be granted the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A method for wireless communication at a user equipment (UE), include: receiving, from a base station, a configuration for a plurality of configured reference signals for path loss estimation; updating a reference signal to be used for the path loss estimation according to the plurality of configured reference signals; receiving, from the base station, a plurality of active reference signals corresponding to the reference signal after the updating and based at least in part on a periodicity of the reference signal; measuring a plurality of path loss values ​​based at least in part on receiving the plurality of active reference signals; calculating a path loss estimate using a plurality of measured path loss values ​​corresponding to the reference signal; as well as An uplink message is transmitted according to an uplink transmit power based at least in part on the path loss estimate.

2. The method of claim 1, wherein updating the reference signal comprises activating the reference signal, the method further comprising: include: The reference signal to be used for the path loss estimation is determined based at least in part on the reference signal being an activated reference signal.

3. The method of claim 1, further comprising: include: A medium access control (MAC) control element is received from the base station indicating the reference signal, wherein the updating is based at least in part on the MAC control element.

4. The method of claim 1, further comprising: include: Layer 3 filtering is performed on the measured plurality of path loss values, wherein the path loss estimate is calculated based at least in part on the layer 3 filtering.

5. The method of claim 1, further comprising: include: The plurality of active reference signals to be received for the path loss estimation are determined based at least in part on a threshold number of active reference signals or a threshold duration for measuring the plurality of path loss values, or both.

6. The method of claim 1, further comprising: include: An additional reference signal in the plurality of configured reference signals is updated based at least in part on updating the reference signal, wherein updating the additional reference signal comprises deactivating the additional reference signal.

7. The method of claim 6, further comprising: include: receiving the additional reference signal from the base station after the deactivation; as well as Additional path loss values ​​are measured based at least in part on receiving the additional reference signal.

8. The method of claim 7, further comprising: include: further updating the additional reference signal, wherein further updating the additional reference signal comprises reactivating the additional reference signal; calculating an additional path loss estimate using the measured additional path loss value; as well as An additional uplink message is transmitted based on an additional uplink transmit power based at least in part on the additional path loss estimate and the reactivation of the additional reference signal.

9. The method of claim 6, further comprising: include: Receiving the additional reference signal is refrained from subsequent to the deactivating.

10. The method of claim 6, further comprising: include: activating a timer after said deactivation; if the timer is running, receiving the additional reference signal from the base station after the deactivation; identifying expiration of the timer; as well as If the timer is inactive, receiving the additional reference signal is suppressed after the deactivating.

11. The method of claim 6, further comprising: include: storing, upon said deactivation, an additional path loss estimate corresponding to said additional reference signal; further updating the additional reference signal, wherein the further updating the additional reference signal comprises reactivating the additional reference signal; as well as An additional uplink message is transmitted based on an additional uplink transmit power based at least in part on the stored additional path loss estimate and the reactivation of the additional reference signal.

12. The method of claim 1, wherein the reference signal to be used for the path loss estimation among the plurality of configured reference signals is updated include: A plurality of active reference signals from the plurality of configured reference signals to be used for a plurality of path loss estimates corresponding to a plurality of communication beams is determined. 13 . The method of claim 12 , wherein the number of reference signals in the plurality of active reference signals is less than or equal to the number of reference signals in the plurality of configured reference signals.

14. The method of claim 12, further comprising: include: An indication of UE beamforming capabilities is transmitted to the base station, wherein a number of reference signals in the plurality of configured reference signals or a number of reference signals in the plurality of active reference signals, or both, is based at least in part on the UE beamforming capabilities.

15. A method for wireless communication at a base station, include: transmitting to a user equipment (UE) a configuration for a plurality of configured reference signals for path loss estimation at the UE; Updating a reference signal used for the path loss estimation among the plurality of configured reference signals; transmitting, after the updating and based at least in part on a periodicity of the updated reference signal, to the UE a plurality of active reference signals corresponding to the updated reference signal; as well as An uplink message is received from the UE, the uplink message transmitted at an uplink transmit power based at least in part on a plurality of path loss measurements for the plurality of active reference signals.

16. The method of claim 15, wherein updating the reference signal include: A medium access control (MAC) control element indicating the reference signal is transmitted to the UE.

17. The method of claim 15, wherein updating the reference signal include: The reference signal is activated.

18. The method of claim 15, further comprising: include: A deactivated reference signal of the plurality of configured reference signals is transmitted to the UE.

19. The method of claim 18, further comprising: include: updating a deactivated reference signal used for the path loss estimation, wherein updating the deactivated reference signal comprises activating the deactivated reference signal; as well as Additional uplink messages are received from the UE according to additional uplink transmit powers based at least in part on additional path loss measurements for the deactivated reference signals.

20. The method of claim 15, further comprising: include: Transmission of disabled reference signals among the plurality of configured reference signals is refrained.

21. The method of claim 15, further comprising: include: updating an additional reference signal among the plurality of configured reference signals for the path loss estimation, wherein updating the additional reference signal comprises deactivating the additional reference signal; activating a timer after said deactivation; if the timer is running, transmitting the additional reference signal to the UE after the deactivation; identifying expiration of the timer; as well as If the timer is inactive, transmitting the additional reference signal is refrained from following the deactivation.

22. The method of claim 15, further comprising: include: A plurality of reference signals among the plurality of configured reference signals for a plurality of path loss estimates corresponding to a plurality of communication beams are updated, wherein updating the plurality of reference signals comprises activating the plurality of reference signals.

23. The method of claim 22, wherein the number of reference signals in the plurality of activated reference signals is less than or equal to the number of reference signals in the plurality of configured reference signals.

24. A method for wireless communication at a user equipment (UE), include: receiving a medium access control MAC control element for updating a first reference signal from a base station; determining a second reference signal to be used for path loss estimation from a plurality of configured reference signals based at least in part on the updated first reference signal; receiving, from the base station, a plurality of active reference signals corresponding to the determined second reference signal based at least in part on the determined periodicity of the second reference signal; measuring a plurality of path loss values ​​based at least in part on receiving the plurality of active reference signals; calculating a path loss estimate using the measured plurality of path loss values ​​corresponding to the determined second reference signal; as well as An uplink message is transmitted according to an uplink transmit power based at least in part on the path loss estimate.

25. The method of claim 24, wherein the MAC control element activates the first reference signal, and the first reference signal is the same as the second reference signal.

26. The method of claim 24, wherein the MAC control element deactivates the first reference signal, and the first reference signal is different from the second reference signal.

27. An apparatus for wireless communication, include: processor; as well as A memory coupled to the processor, the processor and the memory being configured to perform the steps of the method of any one of claims 1 to 26.

28. A device for wireless communication, include: Apparatus for performing the steps of the method as claimed in any one of claims 1 to 26.

29. A non-transitory computer readable medium storing code for wireless communication, which, when executed by at least one processor of a device, causes the at least one processor to perform the steps of the method of any one of claims 1 to 26.

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