Path loss reference signal identification

Abstract

In summary, various aspects of the present disclosure relate to wireless communications. In some aspects, a user equipment (UE) may identify one or more path loss reference signals based at least in part on whether a configuration indicating a path loss reference signal set has been received and based at least in part on whether a path loss reference signal activation command has been received; and estimate path loss using the one or more path loss reference signals. Numerous other aspects are provided.

Description

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This patent application claims the benefit of priority to U.S. Provisional Patent Application No. 62 / 980,847, filed on February 24, 2020, entitled “PATHLOSS REFERENCE SIGNAL IDENTIFICATION”; U.S. Provisional Patent Application No. 62 / 982,707, filed on February 27, 2020, entitled “PATHLOSS REFERENCE SIGNAL IDENTIFICATION”; and U.S. Non-Provisional Patent Application No. 17 / 168,497, filed on February 5, 2021, entitled “PATHLOSS REFERENCE SIGNAL IDENTIFICATION”, all of which are hereby expressly incorporated herein by reference. Technical Field

[0003]

[0006] Generally speaking, aspects of the disclosure relate to wireless communications and to techniques and apparatus for path loss reference signal identification. Background Art

[0004] Wireless communication systems are widely deployed to provide various telecommunication services such as telephony, video, data, messaging, and broadcasting. Typical wireless communication systems may employ multiple access technologies that can support communication with multiple users by sharing available system resources (e.g., bandwidth, transmit power, etc.). Examples of such multiple access technologies include code division multiple access (CDMA) systems, time division multiple access (TDMA) systems, frequency division multiple access (FDMA) systems, orthogonal frequency division multiple access (OFDMA) systems, single carrier frequency division multiple access (SC-FDMA) systems, time division synchronous code division multiple access (TD-SCDMA) systems, and long term evolution (LTE). LTE / LTE-Advanced is a set of enhancements to the Universal Mobile Telecommunications System (UMTS) mobile standard released by the Third Generation Partnership Project (3GPP).

[0005] A wireless communication network may include multiple base stations (BSs) that can support communications for multiple user equipments (UEs). The UE may communicate with the BS via a downlink and an uplink. The downlink (or forward link) refers to a communication link from the BS to the UE, and the uplink (or reverse link) refers to a communication link from the UE to the BS. As will be described in more detail herein, the BS may be referred to as a Node B, gNB, access point (AP), radio head, transmit receive point (TRP), new radio (NR) BS, 5G Node B, etc.

[0006] The above multiple access technologies have been adopted in various telecommunication standards to provide a common protocol that enables different user devices to communicate at the city, country, region, and even global level. NR (which may also be referred to as 5G) is an enhancement set to the LTE mobile standard released by 3GPP. NR is designed to better integrate with other open standards by improving spectrum efficiency, reducing costs, improving services, utilizing new spectrum, and using orthogonal frequency division multiplexing (OFDM) (CP-OFDM) with cyclic prefix (CP) on the downlink (DL), using CP-OFDM and / or SC-FDM (e.g., also known as discrete Fourier transform spread OFDM (DFT-s-OFDM)) on the uplink (UL), and supporting beamforming, multiple input multiple output (MIMO) antenna technology and carrier aggregation, so as to better support mobile broadband Internet access. However, as the demand for mobile broadband access continues to grow, there is a need for further improvements to LTE and NR technologies. Preferably, these improvements should be applicable to other multiple access technologies and telecommunication standards that adopt these technologies. Summary of the invention

[0007] In some aspects, a method of wireless communication performed by a user equipment (UE) may include: identifying one or more path loss reference signals based at least in part on whether a configuration indicating a path loss reference signal set has been received and at least in part on whether a path loss reference signal activation command has been received; and estimating path loss using the one or more path loss reference signals.

[0008] In some aspects, a method of wireless communication performed by a UE may include: identifying one or more path loss reference signals based at least in part on a configuration indicating a path loss reference signal set, wherein the number of path loss reference signals included in the path loss reference signal set is based at least in part on whether a path loss reference signal activation command is enabled or disabled; and estimating path loss using the one or more path loss reference signals.

[0009] In some aspects, a UE for wireless communication may include a memory and one or more processors operatively coupled to the memory. The memory and the one or more processors may be configured to: identify one or more path loss reference signals based at least in part on whether a configuration indicating a path loss reference signal set has been received and based at least in part on whether a path loss reference signal activation command has been received; and estimate path loss using the one or more path loss reference signals.

[0010] In some aspects, a UE for wireless communication may include a memory and one or more processors operatively coupled to the memory. The memory and the one or more processors may be configured to: identify one or more path loss reference signals based at least in part on a configuration indicating a path loss reference signal set, wherein the number of path loss reference signals included in the path loss reference signal set is based at least in part on whether a path loss reference signal activation command is enabled or disabled; and estimate path loss using the one or more path loss reference signals.

[0011] In some aspects, a non-transitory computer-readable medium may store one or more instructions for wireless communication. When the one or more instructions are executed by one or more processors of a UE, the one or more processors may perform the following operations: identifying one or more path loss reference signals based at least in part on whether a configuration indicating a path loss reference signal set has been received and at least in part on whether a path loss reference signal activation command has been received; and estimating path loss using the one or more path loss reference signals.

[0012] In some aspects, a non-transitory computer-readable medium may store one or more instructions for wireless communication. When executed by one or more processors of a UE, the one or more instructions may cause the one or more processors to perform the following operations: identifying one or more path loss reference signals based at least in part on a configuration indicating a path loss reference signal set, wherein the number of path loss reference signals included in the path loss reference signal set is based at least in part on whether a path loss reference signal activation command is enabled or disabled; and estimating path loss using the one or more path loss reference signals.

[0013] In some aspects, an apparatus for wireless communication may include: a unit for identifying one or more path loss reference signals based at least in part on whether a configuration indicating a path loss reference signal set has been received and at least in part on whether a path loss reference signal activation command has been received; and a unit for estimating path loss using the one or more path loss reference signals.

[0014] In some aspects, an apparatus for wireless communication may include: a unit for identifying one or more path loss reference signals based at least in part on a configuration indicating a path loss reference signal set, wherein the number of path loss reference signals included in the path loss reference signal set is based at least in part on whether a path loss reference signal activation command is enabled or disabled; and a unit for estimating path loss using the one or more path loss reference signals.

[0015] In summary, aspects include methods, apparatus, systems, computer program products, non-transitory computer-readable media, user equipment, base stations, wireless communication devices, and / or processing systems as fully described herein with reference to and as illustrated by the accompanying drawings and description.

[0016] The foregoing has been fairly broadly summarized according to the features and technical advantages of the examples of the present disclosure, so that the following detailed description can be better understood. Additional features and advantages will be described below. The disclosed concepts and specific examples can be easily used as the basis for modifying or designing other structures for the same purpose of achieving the present disclosure. Such equivalent constructions do not depart from the scope of the appended claims. When considered in conjunction with the accompanying drawings, the characteristics of the concepts disclosed herein (both their organization and method of operation) and the associated advantages will be better understood according to the description below. Each of the figures in the accompanying drawings is provided for the purpose of illustration and description, and is not intended to be a definition of the limitations of the claims. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to fully understand the above features of the present disclosure, a more specific description of the above brief summary can be obtained by referring to various aspects (some of which are shown in the accompanying drawings). However, it should be noted that the accompanying drawings only show some typical aspects of the present disclosure and are therefore not considered to limit the scope of the present disclosure, as the description may allow for other equally effective aspects. The same reference numerals in different drawings may identify the same or similar elements.

[0018] Figure 1 is a block diagram illustrating an example of a wireless communication network in accordance with various aspects of the present disclosure.

[0019] Figure 2 is a block diagram illustrating an example of a base station communicating with a UE in a wireless communication network according to various aspects of the present disclosure.

[0020] Figure 3 is a schematic diagram illustrating an example process, for example, performed by a user device, according to various aspects of the present disclosure.

[0021] Figure 4 is a schematic diagram illustrating another example process, for example, performed by a user device, according to various aspects of the present disclosure.

[0022] Figure 5 is a data flow diagram illustrating an example of data flow between different components in an example apparatus according to various aspects of the present disclosure.

[0023] Figure 6is a schematic diagram illustrating an example of a hardware implementation for an apparatus employing a processing system according to various aspects of the present disclosure. DETAILED DESCRIPTION

[0024] The following is a more complete description of various aspects of the present disclosure with reference to the accompanying drawings. However, the present disclosure can be embodied in many different forms and should not be construed as being limited to any specific structure or function presented throughout the present disclosure. More specifically, these aspects are provided so that the present disclosure will be thorough and complete, and the scope of the present disclosure will be fully conveyed to those skilled in the art. Based on the teachings herein, it should be understood by those skilled in the art that the scope of the present disclosure is intended to cover any aspect of the present disclosure disclosed herein, whether it is implemented independently of any other aspect of the present disclosure or implemented in combination with any other aspect. For example, using any number of aspects set forth herein, a device can be implemented or a method can be implemented. In addition, the scope of the present disclosure is intended to cover such a device or method implemented using other structures, functions, or structures and functions other than the various aspects of the present disclosure set forth herein or different from the various aspects of the present disclosure set forth herein. It should be understood that any aspect of the present disclosure disclosed herein can be embodied by one or more elements of the claims.

[0025] Several aspects of telecommunication systems will now be presented with reference to various devices and techniques. These devices and techniques will be described in the following detailed description and illustrated in the accompanying drawings by various blocks, modules, components, circuits, steps, processes, algorithms, etc. (collectively referred to as "elements"). These elements may be implemented using hardware, software, or a combination thereof. Whether such elements are implemented as hardware or software depends on the specific application and the design constraints imposed on the overall system.

[0026] It should be noted that although various aspects may be described herein using terms commonly associated with 3G and / or 4G wireless technologies, various aspects of the present disclosure may be applied to communication systems based on other generations, such as 5G and beyond (including NR technologies).

[0027] Figure 11 is a schematic diagram showing a wireless network 100 in which various aspects of the present disclosure may be implemented. The wireless network 100 may be an LTE network or some other wireless network (such as a 5G or NR network). The wireless network 100 may include multiple BSs 110 (shown as BS 110a, BS 110b, BS 110c, and BS 110d) and other network entities. A BS is an entity that communicates with a user equipment (UE) and may also be referred to as a base station, NR BS, Node B, gNB, 5G Node B (NB), access point, transmit receive point (TRP), etc. Each BS may provide communication coverage for a specific geographic area. In 3GPP, the term "cell" may refer to a coverage area of ​​a BS and / or a BS subsystem serving the coverage area, depending on the context in which the term is used.

[0028] A BS may provide communication coverage for a macro cell, a pico cell, a femto cell, and / or another type of cell. A macro cell may cover a relatively large geographic area (e.g., several kilometers in radius) and may allow unrestricted access by UEs with service subscription. A pico cell may cover a relatively small geographic area and may allow unrestricted access by UEs with service subscription. A femto cell may cover a relatively small geographic area (e.g., a residence) and may allow restricted access by UEs associated with the femto cell (e.g., UEs in a closed subscriber group (CSG)). A BS for a macro cell may be referred to as a macro BS. A BS for a pico cell may be referred to as a pico BS. A BS for a femto cell may be referred to as a femto BS or a home BS. In Figure 1 In the example shown in , BS 110a may be a macro BS for macro cell 102a, BS 110b may be a pico BS for pico cell 102b, and BS 110c may be a femto BS for femto cell 102c. A BS may support one or more (e.g., three) cells. The terms "eNB", "base station", "NR BS", "gNB", "TRP", "AP", "Node B", "5G NB", and "cell" may be used interchangeably herein.

[0029] In some aspects, the cells may not necessarily be stationary, and the geographic area of ​​the cells may move depending on the location of the mobile BS. In some aspects, the BSs may be interconnected with each other and / or with one or more other BSs or network nodes (not shown) in the wireless network 100 via various types of backhaul interfaces, such as direct physical connections, virtual networks, and / or similar interfaces using any suitable transport networks.

[0030] The wireless network 100 may also include a relay station. A relay station is an entity that can receive data transmissions from an upstream station (e.g., a BS or a UE) and send data transmissions to a downstream station (e.g., a UE or a BS). A relay station may also be a UE that is capable of relaying transmissions for other UEs. Figure 1 In the example shown in , a relay station 110d may communicate with a macro BS 110a and a UE 120d to facilitate communication between the BS 110a and the UE 120d. A relay station may also be referred to as a relay BS, a relay base station, a relay, or the like.

[0031] The wireless network 100 may be a heterogeneous network including different types of BSs (e.g., macro BSs, pico BSs, femto BSs, relay BSs, etc.). These different types of BSs may have different transmit power levels, different coverage areas, and different effects on interference in the wireless network 100. For example, a macro BS may have a high transmit power level (e.g., 5 to 40 watts), while a pico BS, a femto BS, and a relay BS may have a lower transmit power level (e.g., 0.1 to 2 watts).

[0032] A network controller 130 may be coupled to a set of BSs and may provide coordination and control for these BSs. The network controller 130 may communicate with the BSs via a backhaul. The BSs may also communicate with each other directly or indirectly via a wireless or wired backhaul.

[0033] UE 120 (e.g., 120a, 120b, 120c) can be dispersed throughout the wireless network 100, and each UE can be stationary or mobile. UE can also be referred to as an access terminal, terminal, mobile station, subscriber unit, station, etc. UE can be a cellular phone (e.g., a smart phone), a personal digital assistant (PDA), a wireless modem, a wireless communication device, a handheld device, a laptop computer, a cordless phone, a wireless local loop (WLL) station, a tablet device, a camera, a gaming device, a netbook, a smartbook, an ultrabook, a medical device or apparatus, a biometric sensor / device, a wearable device (smart watch, smart clothing, smart glasses, smart wristband, smart jewelry (e.g., smart ring, smart bracelet, etc.)), an entertainment device (e.g., a music or video device, or a satellite radio unit), a vehicle component or sensor, a smart meter / sensor, an industrial manufacturing device, a global positioning system device, or any other suitable device configured to communicate via a wireless or wired medium.

[0034] Some UEs may be considered as machine type communication (MTC) or evolved or enhanced machine type communication (eMTC) UEs. MTC and eMTC UEs include, for example, robots, drones, remote devices, sensors, meters, monitors, location tags, etc., which may communicate with a base station, another device (e.g., a remote device), or some other entity. A wireless node may provide a connection to or to a network (e.g., a wide area network such as the Internet or a cellular network) via, for example, a wired or wireless communication link. Some UEs may be considered as Internet of Things (IoT) devices, and / or may be implemented as NB-IoT (narrowband Internet of Things) devices. Some UEs may be considered as customer premises equipment (CPE). UE 120 may be included inside a housing that houses components of UE 120 (such as a processor component, a memory component, etc.).

[0035] Typically, any number of wireless networks can be deployed in a given geographic area. Each wireless network can support a specific radio access technology (RAT) and can operate on one or more frequencies. RAT can also be referred to as radio technology, air interface, etc. Frequency can also be referred to as carrier, channel, etc. Each frequency can support a single RAT in a given geographic area to avoid interference between wireless networks of different RATs. In some cases, NR or 5G RAT networks can be deployed.

[0036] In some aspects, two or more UEs 120 (e.g., shown as UE 120a and UE 120e) may communicate directly using one or more sidelink channels (e.g., without using base station 110 as an intermediary to communicate with each other). For example, UE 120 may communicate using peer-to-peer (P2P) communication, device-to-device (D2D) communication, vehicle-to-everything (V2X) protocols (e.g., which may include vehicle-to-vehicle (V2V) protocols, vehicle-to-infrastructure (V2I) protocols, etc.), mesh networks, etc. In such cases, UE 120 may perform scheduling operations, resource selection operations, and / or other operations described elsewhere herein as being performed by base station 110.

[0037] As noted above, Figure 1 is provided as an example. Other examples may differ from those described above. Figure 1 Examples described.

[0038] Figure 2 Base station 110 and UE 120 (which may be Figure 11. Block diagram of a design 200 of a base station in a base station and a UE in a UE. Base station 110 may be equipped with T antennas 234a through 234t, and UE 120 may be equipped with R antennas 252a through 252r, where in general, T≥1 and R≥1.

[0039] At the base station 110, the transmit processor 220 may receive data for one or more UEs from the data source 212, select one or more modulation and coding schemes (MCS) for each UE based at least in part on a channel quality indicator (CQI) received from the UE, process (e.g., encode and modulate) the data for the UE based at least in part on the MCS selected for each UE, and provide data symbols for all UEs. The transmit processor 220 may also process system information (e.g., for semi-static resource partitioning information (SRPI), etc.) and control information (e.g., CQI requests, grants, upper layer signaling, etc.), and provide overhead symbols and control symbols. The transmit processor 220 may also generate reference symbols for reference signals (e.g., cell-specific reference signals (CRS)) and synchronization signals (e.g., primary synchronization signals (PSS) and secondary synchronization signals (SSS)). The transmit (TX) multiple-input multiple-output (MIMO) processor 230 may perform spatial processing (e.g., precoding) on ​​data symbols, control symbols, overhead symbols, and / or reference symbols, if applicable, and may provide T output symbol streams to T modulators (MOD) 232a to 232t. Each modulator 232 may process a corresponding output symbol stream (e.g., for OFDM, etc.) to obtain an output sample stream. Each modulator 232 may further process (e.g., convert to analog, amplify, filter, and up-convert) the output sample stream to obtain a downlink signal. T downlink signals from modulators 232a to 232t may be transmitted via T antennas 234a to 234t, respectively. According to various aspects described in more detail below, a synchronization signal may be generated using position coding to transmit additional information.

[0040] At UE 120, antennas 252a to 252r may receive downlink signals from base station 110 and / or other base stations, and may provide received signals to demodulators (DEMODs) 254a to 254r, respectively. Each demodulator 254 may condition (e.g., filter, amplify, downconvert, and digitize) the received signal to obtain input samples. Each demodulator 254 may further process the input samples (e.g., for OFDM, etc.) to obtain received symbols. MIMO detector 256 may obtain received symbols from all R demodulators 254a to 254r, perform MIMO detection on the received symbols (if applicable), and provide detected symbols. Receive processor 258 may process (e.g., demodulate and decode) the detected symbols, provide decoded data for UE 120 to data sink 260, and provide decoded control information and system information to controller / processor 280. The channel processor may determine reference signal received power (RSRP), received signal strength indicator (RSSI), reference signal received quality (RSRQ), channel quality indicator (CQI), etc. In some aspects, one or more components of UE 120 may be included in a housing.

[0041] On the uplink, at the UE 120, a transmit processor 264 may receive and process data from a data source 262 and control information from a controller / processor 280 (e.g., for reports including RSRP, RSSI, RSRQ, CQI, etc.). The transmit processor 264 may also generate reference symbols for one or more reference signals. The symbols from the transmit processor 264 may be precoded by a TX MIMO processor 266 (if applicable), further processed by modulators 254a through 254r (e.g., for DFT-s-OFDM, CP-OFDM, etc.), and transmitted to the base station 110. At the base station 110, uplink signals from the UE 120 and other UEs may be received by the antenna 234, processed by the demodulator 232, detected by the MIMO detector 236 (if applicable), and further processed by the receive processor 238 to obtain decoded data and control information transmitted by the UE 120. The receive processor 238 may provide decoded data to a data sink 239 and provide decoded control information to a controller / processor 240. The base station 110 may include a communication unit 244 and communicate with the network controller 130 via the communication unit 244. The network controller 130 may include a communication unit 294, a controller / processor 290, and a memory 292.

[0042] The controller / processor 240 of the base station 110, the controller / processor 280 of the UE 120, and / or Figure 2Any other component in the controller / processor 240 of the base station 110, the controller / processor 280 of the UE 120, and / or Figure 2 Any other component in may perform or direct e.g. Figure 3 The process 300 Figure 4 The operations of process 400 and / or other processes as described herein. Memories 242 and 282 may store data and program codes for base station 110 and UE 120, respectively. In some aspects, memory 242 and / or memory 282 may include a non-transitory computer-readable medium storing one or more instructions for wireless communication. For example, one or more instructions, when executed by one or more processors of base station 110 and / or UE 120, may perform or direct, for example, Figure 3 The process 300 Figure 4 The scheduler 246 may schedule UEs for data transmission on the downlink and / or uplink.

[0043] In some aspects, UE 120 may include: a unit for identifying one or more path loss reference signals based at least in part on whether a configuration indicating a path loss reference signal set has been received and based at least in part on whether a path loss reference signal activation command has been received; a unit for estimating path loss using the one or more path loss reference signals; etc. Additionally or alternatively, UE 120 may include: a unit for identifying one or more path loss reference signals based at least in part on a configuration indicating a path loss reference signal set, wherein the number of path loss reference signals included in the path loss reference signal set is based at least in part on whether the path loss reference signal activation command is enabled or disabled; a unit for estimating path loss using the one or more path loss reference signals; etc. In some aspects, such a unit may include combining Figure 2 One or more components of UE 120 are depicted, such as controller / processor 280, transmit processor 264, TX MIMO processor 266, MOD 254, antenna 252, DEMOD 254, MIMO detector 256, receive processor 258, etc.

[0044] As noted above, Figure 2 is provided as an example. Other examples may differ from those described above. Figure 2 Examples described.

[0045] In some scenarios, quasi-co-location (QCL) information (e.g., QCL characteristics) and / or QCL types may be dependent on or based on other information. QCL characteristics may include, for example, Doppler shift, Doppler spread, average delay, delay spread, or spatial reception parameters, among other examples. For example, one or more QCL types indicated to the UE may be based on a higher-layer parameter QCL-Type, and may take one or a combination of the following types:

[0046] QCL-Type A: {Doppler shift, Doppler spread, average delay, delay spread},

[0047] QCL-Type B: {Doppler shift, Doppler spread},

[0048] QCL-Type C: {average delay, Doppler shift}, or

[0049] QCL-Type D: {Spatial Rx parameters}.

[0050] The UE may use the spatial QCL assumptions (e.g., spatial reception parameters of QCL-Type D) to select an analog or digital receive (Rx) beam (e.g., during a beam management procedure). For example, a synchronization signal block (SSB) resource indicator (SSBRI or SRI) may indicate that the same beam used for a previous reference signal should be used for subsequent communications.

[0051] The UE may identify an initial control resource set (CORESET) (e.g., with CORESET ID 0 or CORESET#0 for short) in the NR during an initialization procedure (e.g., via a field in a master information block (MIB)). A ControlResourceSet information element (CORESET IE) sent via radio resource control (RRC) signaling (e.g., included in an RRC message) may convey information about the CORESET configured for the UE. The CORESET IE typically includes a CORESET identifier (ID), an indication of the frequency domain resources (e.g., the number of RBs) assigned to the CORESET, the continuous duration of the CORESET (in number of symbols), and a transmission configuration indicator (TCI) status.

[0052] The TCI state may indicate the directionality or characteristics of a downlink beam, such as one or more QCL characteristics of a downlink beam. As mentioned above, a subset of TCI states indicates the QCL relationship between a DL reference signal (RS) in a reference signal (RS) set (e.g., TCI-Set) and a physical downlink control channel (PDCCH) demodulation reference signal (DMRS) port. A specific TCI state for a given UE (e.g., for a unicast PDCCH) may be transmitted to the UE via a medium access control (MAC) control element (MAC-CE). A specific TCI state is typically selected from a set of TCI states transmitted via a CORESET IE, where the initial CORESET (CORESET#0) is typically configured via the MIB.

[0053] Search space information may also be provided via RRC signaling. For example, the Search Space IE is another RRC IE that defines the resources in which the UE is to search for PDCCH candidates for a given CORESET. Each search space is associated with a CORESET. The Search Space IE uses a Search Space ID to identify the search space configured for the CORESET. In one aspect, the Search Space ID associated with CORESET#0 is Search Space ID#0. The search space is typically configured via the Physical Broadcast Channel (PBCH) (e.g., in the MIB).

[0054] In many cases, it is important for the UE to know which assumptions the UE may make on the channels corresponding to different transmissions. For example, the UE may need to know which reference signals the UE may use to estimate the channel in order to decode a transmitted signal or communication (e.g., a PDCCH communication or a physical downlink shared channel (PDSCH) communication). It may also be important to enable the UE to report relevant channel state information (CSI) to the base station for scheduling, link adaptation and / or beam management purposes. In NR, the concept of QCL and TCI states is used to convey information about these assumptions.

[0055] The QCL assumption is typically defined in terms of channel characteristics. According to 3GPP TS 38.214, "Two antenna ports are said to be quasi-co-located if the characteristics of the channel over which symbols on one antenna port are transmitted can be inferred from the channel over which symbols on the other antenna port are transmitted." Different reference signals may be considered to be quasi-co-located ("QCLed" or "QCL'd") if a receiver (e.g., UE) can apply channel characteristics determined by detecting the first reference signal to help detect the second reference signal. The TCI state typically includes configurations such as, for example, the QCL relationship between DLRS and PDSCH DMRS ports in a channel state information reference signal (CSI-RS) set.

[0056] In some cases, a UE may be configured with up to M TCI-States. The M TCI-States may be configured via higher layer signaling, and the UE may be signaled to decode the PDSCH based on a detected PDCCH with downlink control information (DCI), where the DCI indicates one of the TCI states. Each configured TCI state may include an RS set TCI-RS-SetConfig, which indicates different QCL assumptions between certain source and target signals.

[0057] The UE may measure one or more downlink reference signals received from a base station to estimate the path loss between the UE and the base station. The path loss indicates the reduction in the power density of a signal when the signal propagates between a wireless communication device (e.g., a UE and a base station). For example, the base station may send a downlink reference signal using a transmit power known to the UE (e.g., due to an indication from the base station or due to a fixed transmit power). The UE may decode the downlink reference signal and measure a received power representing a power level at which the UE receives the downlink reference signal. The UE may compare the transmit power (e.g., reference signal transmit power) and the received power (e.g., RSRP) to determine the path loss. This is an example of estimating the path loss from a downlink reference signal, and the UE may estimate the path loss in another manner.

[0058] In some cases, the base station may configure (e.g., using a radio resource control (RRC) message) a set of path loss reference signals, which is sometimes referred to as a path loss reference signal pool. In some cases, the base station may use a command (e.g., a signal, a message, etc.) to instruct the UE to use one or more path loss reference signals in the configured path loss reference signal set. For example, the base station may activate one or more path loss reference signals in the configured path loss reference signal set by sending a path loss reference signal activation command to the UE. In some cases, the path loss reference signal activation command may be included in a medium access control (MAC) control element (CE) (collectively referred to as MAC-CE). Upon receiving a MAC-CE indicating that one or more path loss reference signals are to be activated, the UE may measure those one or more activated path loss reference signals and / or may use those one or more activated path loss reference signals to estimate the path loss between the UE and the base station.

[0059] In addition to the activated path loss reference signal for measuring and / or estimating path loss, the UE may also use one or more default path loss reference signals (if present). The use of sounding reference signal (SRS), physical uplink control channel (PUCCH) communication, and physical uplink shared channel (PUSCH) communication scheduled by DCI format 0_0 may be enabled by corresponding RRC flags, such as:

[0060] For PUSCH scheduled by DCI format 0_0, it is enableDefaultBeamPIForPUSCH0_0; for dedicated PUCCH, it is enableDefaultBeamPIForPUCCH; and / or for dedicated SRS, it is enableDefaultBeamPIForSRS.

[0061] If enabled, the default path loss reference signal is QCL (with one of QCL types A, B, C, or D), where the reference signal QCL parameters or attributes are used to receive the CORESET with the lowest ID in the active downlink bandwidth part (BWP) of the UE's current component carrier (CC). If no CORESET is configured for the UE in the active downlink BWP, the default path loss reference signal is a QCL type A, type B, type C, or type D reference signal in the TCI state activated for PDSCH reception in the active DL BWP of the UE's current CC. In some aspects, when the MAC-CE based path loss reference signal activation feature has been enabled (e.g., the RRC flag enablePLRSupdateForPUSCHSRS is set to true) and the total number of configured path loss reference signals meets a threshold (e.g., greater than four), the default path loss reference signal and the activated path loss reference signal can be measured and / or estimated using the default path loss reference signal. In some aspects, when a MAC-CE based path loss reference signal activation feature has been enabled and the total number of configured path loss reference signals does not meet a threshold (e.g., less than or equal to four), all configured path loss reference signals and activated path loss reference signals can be measured and / or estimated using them.

[0062] However, in some cases, the UE may receive a configuration indicating a path loss reference signal set, but may fail to receive a MAC-CE that activates one or more path loss reference signals in the configured path loss reference signal set. For example, the base station may fail to send a MAC-CE, the UE may fail to receive and / or fail to successfully decode the MAC-CE, and so on. In these cases, there may be ambiguity about which path loss reference signals the UE should use to estimate the path loss. For example, the base station may expect the UE to use a first path loss reference signal (or a first path loss reference signal set) to estimate the path loss, but the UE may use a second path loss reference signal (or a second path loss reference signal set) to estimate the path loss. This may result in an incorrect uplink transmit power determination (e.g., selection, calculation, etc.) of the UE, such as when the path loss is used to determine the transmit power of the UE. If the UE selects a transmit power lower than the necessary transmit power, the determination of the incorrect uplink transmit power may result in failed uplink communications, and if the UE selects a transmit power higher than the necessary transmit power, it may result in excessive consumption of UE resources (e.g., battery power). Similar problems may occur if the UE does not receive the configured path loss reference signal set (eg, due to failure of an RRC message, due to configuration failing to indicate the path loss reference signal set, etc.).

[0063] Some techniques and apparatus described herein enable UEs and base stations to reduce ambiguity in path loss reference signal selection. For example, some techniques and apparatus described herein provide rules for the UE to follow to select one or more path loss reference signals in various scenarios (e.g., when a configured set of path loss reference signals is received or not received, when an activation command is received or not received, etc.). In this way, the UE can correctly determine the uplink transmit power, which can improve the reliability of uplink communications, reduce latency and save network resources due to fewer failed communications, save UE battery power by reducing the possibility of determining too high an uplink transmit power, and so on.

[0064] In addition, some techniques and apparatus described herein save UE resources (e.g., processing resources, memory resources, battery power, etc.) by limiting the number of path loss reference signals allowed to be configured when MAC-CE-based activation of path loss reference signals is disabled. When MAC-CE-based activation of path loss reference signals is disabled, configuring a large number (e.g., greater than a threshold number) of path loss reference signals may cause the UE to always measure the large number of path loss reference signals because the MAC-CE cannot be used to activate or deactivate the path loss reference signals. Therefore, some techniques and apparatus described herein save UE resources by setting a maximum number of path loss reference signals allowed to be configured when MAC-CE-based activation of path loss reference signals is disabled. These techniques and apparatus may also increase flexibility in using path loss reference signals by allowing configuration of more than the maximum number of path loss reference signals when MAC-CE-based activation of path loss reference signals is enabled.

[0065] Figure 3 3 is a diagram illustrating an example process 300 performed, for example, by a UE, in accordance with various aspects of the present disclosure. Example process 300 is an example of a UE (eg, UE 120, etc.) performing operations associated with path loss reference signal identification.

[0066] like Figure 3 As shown in , in some aspects, process 300 may include: identifying one or more path loss reference signals based at least in part on whether a configuration indicating a path loss reference signal set has been received and based at least in part on whether a path loss reference signal activation command has been received (block 310). For example, the UE (e.g., using the receive processor 258, the transmit processor 264, the controller / processor 280, the memory 282, Figure 5 The identification component 506, etc.) can identify one or more path loss reference signals based at least in part on whether a configuration indicating a path loss reference signal set has been received and at least in part on whether a path loss reference signal activation command has been received.

[0067] like Figure 3 As further shown in FIG. 1 , in some aspects, process 300 may include: estimating path loss using one or more path loss reference signals (block 320). For example, a UE (e.g., using receive processor 258, transmit processor 264, controller / processor 280, memory 282, Figure 5 The estimation component 508, etc.) can use one or more path loss reference signals to estimate the path loss.

[0068] Process 300 may include additional aspects, such as any single aspect or any combination of aspects described below and / or in conjunction with one or more other processes described elsewhere herein.

[0069] In a first aspect, one or more path loss reference signals are identified based at least in part on at least one of: whether a path loss reference signal activation command is enabled, the number of configured path loss reference signals, whether the number of configured path loss reference signals meets a threshold, or a combination thereof.

[0070] In a second aspect, either alone or in combination with the first aspect, one or more path loss reference signals are identified based at least in part on a determination that a path loss reference signal activation command is enabled and that the number of configured path loss reference signals meets a threshold. In some aspects, the UE may determine that the path loss reference signal activation command is enabled based at least in part on a determination that a configuration (e.g., an RRC message) includes a specific information element (IE) or bit (e.g., an enablePLRSupdateForPUSCHSRS IE or bit) set to a specific value. For example, a first value (e.g., zero) of the IE or bit may indicate that the path loss reference signal activation command is disabled, and a second value (e.g., one) of the IE or bit may indicate that the path loss reference signal activation command is enabled. In some aspects, the threshold is equal to four.

[0071] In a third aspect, alone or in combination with one or more of the first and second aspects, one or more path loss reference signals are identified based at least in part on a determination that a path loss reference signal activation command is enabled and the number of configured path loss reference signals does not meet a threshold. In a fourth aspect, alone or in combination with one or more of the first to third aspects, one or more path loss reference signals are identified based at least in part on a determination that a path loss reference signal activation command is disabled and the number of configured path loss reference signals meets a threshold. In a fifth aspect, alone or in combination with one or more of the first to fourth aspects, one or more path loss reference signals are identified based at least in part on a determination that a path loss reference signal activation command is disabled and the number of configured path loss reference signals does not meet a threshold. In some aspects, the threshold is equal to four. In a sixth aspect, alone or in combination with one or more of the first to fifth aspects, the path loss reference signal activation command is a MAC-CE command.

[0072] In the seventh aspect, either alone or in combination with one or more of the first to sixth aspects, one or more path loss reference signals are identified based at least in part on a determination that a configuration has been received and at least in part on a determination that a path loss reference signal activation command has been received. In the eighth aspect, either alone or in combination with one or more of the first to seventh aspects, one or more path loss reference signals are indicated in a path loss reference signal activation command. In the ninth aspect, either alone or in combination with one or more of the first to eighth aspects, one or more path loss reference signals include a set of path loss reference signals indicated in the configuration or a subset of a set of path loss reference signals indicated in the configuration. For example, if the UE receives a configuration and a path loss reference signal activation command, the UE may estimate the path loss using the path loss reference signal indicated in the path loss reference signal activation command.

[0073] In the tenth aspect, either alone or in combination with one or more of the first to ninth aspects, one or more path loss reference signals are identified based at least in part on a determination that a configuration has been received and at least in part on a determination that a path loss reference signal activation command has not yet been received. In the eleventh aspect, either alone or in combination with one or more of the first to tenth aspects, one or more path loss reference signals include a synchronization signal block for obtaining a master information block. In the twelfth aspect, either alone or in combination with one or more of the first to eleventh aspects, one or more path loss reference signals include a subset of a set of path loss reference signals. In the thirteenth aspect, either alone or in combination with one or more of the first to twelfth aspects, the subset is identified at least in part based on a rule. In the fourteenth aspect, either alone or in combination with one or more of the first to thirteenth aspects, the subset includes a specific number of path loss reference signals (e.g., four path loss reference signals).

[0074] In the fifteenth aspect, alone or in combination with one or more of the first to fourteenth aspects, the subset includes one of the following: a path loss reference signal subset included in the path loss reference signal set and having the highest reference signal identifier in the path loss reference signal set; a path loss reference signal subset included in the path loss reference signal set and having the lowest reference signal identifier in the path loss reference signal set; a path loss reference signal subset included in the path loss reference signal set and having the highest reference signal identifier in the path loss reference signal set in the serving cell; a path loss reference signal subset included in the path loss reference signal set and having the lowest reference signal identifier in the path loss reference signal set in the serving cell; a path loss reference signal subset included in the path loss reference signal set and having the highest reference signal identifier in the path loss reference signal set in the active bandwidth part of the serving cell; or a path loss reference signal subset included in the path loss reference signal set and having the lowest reference signal identifier in the path loss reference signal set in the active bandwidth part of the serving cell.

[0075] In the sixteenth aspect, alone or in combination with one or more of the first to fifteenth aspects, one or more path loss reference signals are indicated by a base station or specified by a wireless communication standard. For example, if the UE does not receive a configuration and / or does not receive a path loss reference signal activation command, the base station and / or the wireless communication standard may indicate that a specific CSI-RS (e.g., with a specific CSI-RS identifier, such as 10) will be used for path loss estimation. In the seventeenth aspect, alone or in combination with one or more of the first to sixteenth aspects, one or more path loss reference signals are not included in a path loss reference signal set.

[0076] In an eighteenth aspect, alone or in combination with one or more of the first to seventeenth aspects, the one or more path loss reference signals include a path loss reference signal subset indicated in the configuration in the path loss reference signal set. In a nineteenth aspect, alone or in combination with one or more of the first to eighteenth aspects, the path loss reference signal subset includes at least one of the following: a path loss reference signal indicated in association with a physical uplink shared channel (PUSCH) power control configuration (e.g., for PUSCH power control, the UE may use the path loss reference signal indicated in the configured SRI-PUSCH-PowerControl IE), a path loss reference signal indicated in association with an activated physical uplink control channel (PUCCH) spatial relationship (e.g., for PUCCH power control, the UE may use the path loss reference signal configured in association with the PUCCH spatial relationship activated by the MAC-CE), a path loss reference signal indicated in association with a sounding reference signal (SRS) resource set (e.g., for SRS power control, the UE may use the path loss reference signal indicated in the SRS resource set used for the SRS), or a combination thereof. In the twentieth aspect, alone or in combination with one or more of the first to nineteenth aspects, the number of path loss reference signals included in the path loss reference signal subset is less than or equal to a threshold (e.g., four).

[0077] In aspect twenty-first aspect, either alone or in combination with one or more of aspects one to twenty, one or more path loss reference signals are identified based at least in part on a determination that a configuration has not been received and at least in part on a determination that a path loss reference signal activation command has not been received. In aspect twenty-second aspect, either alone or in combination with one or more of aspects one to twenty-first aspect, one or more path loss reference signals include a synchronization signal block for obtaining a master information block. In aspect twenty-third aspect, either alone or in combination with one or more of aspects one to twenty-second aspect, one or more path loss reference signals are indicated by a base station or specified by a wireless communication standard. For example, if the UE has not received a configuration and / or has not received a path loss reference signal activation command, the base station and / or the wireless communication standard may indicate that a specific CSI-RS (e.g., having a specific CSI-RS identifier, such as 10) will be used for path loss estimation.

[0078] In aspect twenty-four, either alone or in combination with one or more of aspects one to twenty-three, one or more path loss reference signals are identified for a specific uplink channel or a specific uplink reference signal. For example, one or more path loss reference signals may be identified for PUCCH (e.g., PUCCH communication), PUSCH (e.g., PUSCH communication), physical random access channel (PRACH) (e.g., PRACH communication), SRS, etc. In aspect twenty-fifth, either alone or in combination with one or more of aspects one to twenty-four, different uplink channels (e.g., PUCCH, PUSCH, PRACH, etc.) or different uplink reference signals (e.g., SRS) are associated with at least one of the following: different configurations of corresponding path loss reference signal sets indicating corresponding uplink channels or uplink reference signals, different path loss reference signal activation commands, or a combination thereof.

[0079] In aspect twenty-six, either alone or in combination with one or more of aspects one to twenty-fifth, the configuration and path loss reference signal activation command is specific to an uplink channel (e.g., PUCCH, PUSCH, PRACH, etc.), an uplink reference signal (e.g., SRS), an uplink channel group (e.g., PUCCH, PUSCH, PRACH, etc.), an uplink reference signal group (e.g., SRS in multiple SRS resource sets), or a group including at least one uplink channel and at least one uplink reference signal. In aspect twenty-seven, either alone or in combination with one or more of aspects one to twenty-six, one or more path loss reference signals are identified for all uplink channels and all uplink reference signals.

[0080] In aspect 28, alone or in combination with one or more of aspects 1 to 27, the number of path loss reference signals included in the path loss reference signal set is at least partially based on whether the path loss reference signal activation command is enabled or disabled. In aspect 29, alone or in combination with one or more of aspects 1 to 28, if the path loss reference signal activation command is enabled, the number of path loss reference signals is allowed to be greater than a threshold (e.g., four), and if the path loss reference signal activation command is disabled, the number of path loss reference signals is not allowed to be greater than the threshold (e.g., four).

[0081] In the 30th aspect, either alone or in combination with one or more of aspects 1 to 29, the configuration is included in a radio resource control message. In the 31st aspect, either alone or in combination with one or more of aspects 1 to 30, the path loss reference signal activation command is a MAC-CE message. In the 32nd aspect, either alone or in combination with one or more of aspects 1 to 31, the path loss reference signal set includes at least one channel state information reference signal (CSI-RS).

[0082] In the thirty-first aspect, alone or in combination with one or more of the first to thirtieth aspects, the one or more path loss reference signals include one or more default path loss reference signals.

[0083] Although Figure 3 Example blocks of process 300 are shown, but in some aspects, process 300 may include Figure 3 The blocks depicted in the process 300 may include additional blocks, fewer blocks, different blocks, or blocks arranged in a different manner than those depicted in the process 300. Additionally or alternatively, two or more blocks in the blocks of process 300 may be executed in parallel.

[0084] Figure 4 4 is a diagram illustrating an example process 400, for example, performed by a UE, in accordance with various aspects of the present disclosure. Example process 400 is an example of operations in which a UE (eg, UE 120, etc.) performs operations associated with path loss reference signal identification.

[0085] like Figure 4 As shown in , in some aspects, process 400 may include: identifying one or more path loss reference signals based at least in part on a configuration indicating a path loss reference signal set, wherein the number of path loss reference signals included in the path loss reference signal set is enabled or disabled based at least in part on a path loss reference signal activation command (block 410). For example, a UE (e.g., using receive processor 258, transmit processor 264, controller / processor 280, memory 282, Figure 5 The identification component 506 of the embodiment of the present invention can identify one or more path loss reference signals based at least in part on the configuration of the path loss reference signal set. In some aspects, the number of path loss reference signals included in the path loss reference signal set is based at least in part on whether the path loss reference signal activation command is enabled or disabled.

[0086] like Figure 4As further shown in FIG. 4 , in some aspects, process 400 may include: estimating path loss using one or more path loss reference signals (block 420). For example, a UE (e.g., using receive processor 258, transmit processor 264, controller / processor 280, memory 282, Figure 5 The estimation component 508, etc.) can use one or more path loss reference signals to estimate the path loss.

[0087] Process 400 may include additional aspects, such as any single aspect or any combination of aspects described below and / or in conjunction with one or more other processes described elsewhere herein.

[0088] In the first aspect, if the path loss reference signal activation command is enabled, the number of path loss reference signals is allowed to be greater than a threshold, and if the path loss reference signal activation command is disabled, the number of path loss reference signals is not allowed to be greater than the threshold.

[0089] In a second aspect, alone or in combination with the first aspect, the one or more path loss reference signals include one or more default path loss reference signals.

[0090] Although Figure 4 Example blocks of process 400 are shown, but in some aspects, process 400 may include Figure 4 The blocks depicted in the process 400 may include additional blocks, fewer blocks, different blocks, or blocks arranged in a different manner than those depicted in the process 400. Additionally or alternatively, two or more blocks in the blocks of process 400 may be executed in parallel.

[0091] Figure 5 5 is a data flow diagram 500 illustrating the flow of data between different components in an example apparatus 502. Apparatus 502 may be a UE. In some aspects, apparatus 502 includes a receiving component 504, an identifying component 506, an estimating component 508, and / or a transmitting component 510. As shown, apparatus 502 may communicate with another apparatus 550 (e.g., a UE, a base station, or another wireless communication device) using receiving component 504 and / or transmitting component 510. As shown, apparatus 502 may communicate with apparatus 550 (such as a base station).

[0092] In some aspects, the identification component 506 may identify one or more path loss reference signals based at least in part on whether a configuration indicating a set of path loss reference signals has been received and based at least in part on whether a path loss reference signal activation command has been received. In some aspects, the identification component 506 may determine whether a configuration and / or a path loss reference signal activation command has been received based at least in part on information received from the receiving component 504. In some aspects, the receiving component 504 may receive (or may not receive) a configuration from the device 550 and / or may receive (or may not receive) a path loss reference signal activation command from the device 550. The receiving component 504 may indicate to the identification component 506 whether a configuration has been received and / or whether a path loss reference signal activation command has been received. Additionally or alternatively, the receiving component 504 may provide the configuration and / or the path loss reference signal activation command to the identification component 506. In some aspects, the identification component 506 may identify one or more path loss reference signals based at least in part on a configuration and / or based at least in part on a path loss reference signal activation command.

[0093] Estimation component 508 can estimate path loss using one or more path loss reference signals. For example, identification component 506 can indicate the identified one or more path loss reference signals to estimation component 508. Additionally or alternatively, receiving component 504 can provide a received path loss reference signal (e.g., from a configured set of path loss reference signals) to estimation component 508. Estimation component 508 can estimate path loss using the identified one or more path loss reference signals. In some aspects, estimation component 508 can indicate the estimated path loss to transmission component 510. In some aspects, transmission component 510 can communicate with device 550 using the estimated path loss, such as to determine a transmit power for communications to be sent to device 550.

[0094] The device may include performing the above Figure 3 The process 300 Figure 4 Each block of the algorithm in the process 400 and the like may be additionally configured as a component. Figure 3 The process 300 Figure 4 Each block in the process 400, etc., and the device may include one or more of those components. The component may be one or more hardware components specifically configured to perform the process / algorithm, implemented by a processor configured to perform the process / algorithm, stored in a computer-readable medium for implementation by a processor, or some combination thereof.

[0095] exist Figure 5 The number and arrangement of components shown in the figure are provided as examples. Figure 5 There may be additional components, fewer components, different components, or components arranged in a different manner than those shown in FIG. Figure 5 Two or more components shown in may be implemented in a single component, or in Figure 5 A single component shown in may be implemented as multiple distributed components. Additionally or alternatively, Figure 5 A set of components (e.g., one or more components) shown in can perform the operations described in Figure 5 One or more functions performed by another set of components shown in FIG.

[0096] Figure 6 6 is a diagram 600 illustrating an example of a hardware implementation for an apparatus 605 using a processing system 610. The apparatus 605 may be a UE.

[0097] The processing system 610 may be implemented with a bus architecture, represented generally by bus 615. The bus 615 may include any number of interconnecting buses and bridges, depending on the specific application of the processing system 610 and the overall design constraints. The bus 615 links together various circuits, including one or more processors and / or hardware components represented by processor 620, components 504, 506, 508, and / or 510, and computer-readable media / memory 625. The bus 615 may also link various other circuits such as timing sources, peripherals, voltage regulators, and power management circuits, which are well known in the art and, therefore, will not be described any further.

[0098] The processing system 610 can be coupled to a transceiver 630. The transceiver 630 is coupled to one or more antennas 635. The transceiver 630 provides a means for communicating with various other devices over a transmission medium. The transceiver 630 receives signals from the one or more antennas 635, extracts information from the received signals, and provides the extracted information to the processing system 610 (specifically, the receiving component 504). In addition, the transceiver 630 receives information from the processing system 610 (specifically, the transmitting component 510) and generates a signal to be applied to the one or more antennas 635 based at least in part on the received information.

[0099] The processing system 610 includes a processor 620 coupled to a computer-readable medium / memory 625. The processor 620 is responsible for general processing, which includes executing software stored on the computer-readable medium / memory 625. The software, when executed by the processor 620, causes the processing system 610 to perform the various functions described herein for any particular device. The computer-readable medium / memory 625 can also be used to store data manipulated by the processor 620 when executing the software. The processing system also includes at least one of the components 504, 506, 508, and / or 510. The component can be a software module resident / stored in the computer-readable medium / memory 625, running in the processor 620, one or more hardware modules coupled to the processor 620, or some combination thereof.

[0100] In some aspects, the processing system 610 may be a component of the UE 120 and may include at least one of the TX MIMO processor 266, the RX processor 258, and / or the controller / processor 280 and / or the memory 282. In some aspects, the apparatus 605 for wireless communication includes: a unit for identifying one or more path loss reference signals based at least in part on whether a configuration indicating a path loss reference signal set has been received and at least in part on whether a path loss reference signal activation command has been received; a unit for estimating path loss using the one or more path loss reference signals; and the like. Additionally or alternatively, the apparatus 605 for wireless communication may include: a unit for identifying one or more path loss reference signals based at least in part on a configuration indicating a path loss reference signal set, wherein the number of path loss reference signals included in the path loss reference signal set is enabled or disabled based at least in part on whether the path loss reference signal activation command has been received; a unit for estimating path loss using the one or more path loss reference signals; and the like. The aforementioned means may be one or more of the aforementioned components of the processing system 610 of the apparatus 502 and / or the apparatus 605 configured to perform the functions recited by the aforementioned means. As described elsewhere herein, the processing system 610 may include the TX MIMO processor 266, the RX processor 258, and / or the controller / processor 280. In one configuration, the aforementioned means may be the TX MIMO processor 266, the RX processor 258, and / or the controller / processor 280 configured to perform the functions and / or operations recited herein.

[0101] Figure 6 is provided as an example. Other examples can be combined with Figure 6 The examples described are different.

[0102] The following provides a summary of some aspects of the disclosure:

[0103] Aspect 1: A method of wireless communication performed by a user equipment (UE), comprising: identifying one or more path loss reference signals based at least in part on whether a configuration indicating a path loss reference signal set has been received and at least in part on whether a path loss reference signal activation command has been received; and estimating path loss using the one or more path loss reference signals.

[0104] Aspect 2: A method according to Aspect 1, wherein the one or more path loss reference signals are identified based at least in part on at least one of the following: whether a path loss reference signal activation command is enabled, the number of configured path loss reference signals, whether the number of configured path loss reference signals meets a threshold, or a combination thereof.

[0105] Aspect 3: A method according to Aspect 2, wherein the one or more path loss reference signals are identified based at least in part on a determination that a path loss reference signal activation command is enabled and the number of configured path loss reference signals meets a threshold.

[0106] Aspect 4: A method according to Aspect 2, wherein the one or more path loss reference signals are identified based at least in part on a determination that a path loss reference signal activation command is enabled and the number of configured path loss reference signals does not meet a threshold.

[0107] Aspect 5: A method according to Aspect 2, wherein the one or more path loss reference signals are identified based at least in part on a determination that a path loss reference signal activation command is disabled and the number of configured path loss reference signals meets a threshold.

[0108] Aspect 6: A method according to Aspect 2, wherein the one or more path loss reference signals are identified based at least in part on a determination that a path loss reference signal activation command is disabled and the number of configured path loss reference signals does not meet a threshold.

[0109] Aspect 7: The method according to any one of aspects 2-6, wherein the path loss reference signal activation command is a medium access control (MAC) control element (CE) command.

[0110] Aspect 8: A method according to any of the preceding aspects, wherein the one or more path loss reference signals are identified based at least in part on a determination that the configuration has been received and at least in part on a determination that the path loss reference signal activation command has been received.

[0111] Aspect 9: The method according to aspect 8, wherein the one or more path loss reference signals are indicated in the path loss reference signal activation command.

[0112] Aspect 10: The method according to aspect 8, wherein the one or more path loss reference signals include a set of path loss reference signals indicated in the configuration or a subset of the set of path loss reference signals indicated in the configuration.

[0113] Aspect 11: A method according to any one of Aspects 1-7, wherein the one or more path loss reference signals are identified based at least in part on a determination that the configuration has been received and at least in part on a determination that the path loss reference signal activation command has not yet been received.

[0114] Aspect 12: The method according to aspect 11, wherein the one or more path loss reference signals include a synchronization signal block used to obtain a master information block.

[0115] Aspect 13: The method according to aspect 11, wherein the one or more path loss reference signals include a subset of the path loss reference signal set.

[0116] Aspect 14: The method according to aspect 13, wherein the subset is identified based at least in part on rules.

[0117] Aspect 15: The method according to any one of aspects 13-14, wherein the subset includes a specific number of path loss reference signals.

[0118] Aspect 16: A method according to any one of Aspects 13-15, wherein the subset includes one of the following items: a path loss reference signal subset included in the path loss reference signal set and having the highest reference signal identifier in the path loss reference signal set; a path loss reference signal subset included in the path loss reference signal set and having the lowest reference signal identifier in the path loss reference signal set; a path loss reference signal subset included in the path loss reference signal set and having the highest reference signal identifier in the path loss reference signal set in the serving cell; a path loss reference signal subset included in the path loss reference signal set and having the lowest reference signal identifier in the path loss reference signal set in the serving cell; a path loss reference signal subset included in the path loss reference signal set and having the highest reference signal identifier in the path loss reference signal set in the active bandwidth part of the serving cell; or a path loss reference signal subset included in the path loss reference signal set and having the lowest reference signal identifier in the path loss reference signal set in the active bandwidth part of the serving cell.

[0119] Aspect 17: The method according to aspect 11, wherein the one or more path loss reference signals are indicated by a base station or specified by a wireless communication standard.

[0120] Aspect 18: The method according to aspect 17, wherein the one or more path loss reference signals are not included in the path loss reference signal set.

[0121] Aspect 19: The method according to aspect 11, wherein the one or more path loss reference signals include a subset of path loss reference signals in the path loss reference signal set indicated in the configuration.

[0122] Aspect 20: A method according to Aspect 19, wherein the path loss reference signal subset includes at least one of the following: a path loss reference signal indicated in association with a physical uplink shared channel power control configuration, a path loss reference signal indicated in association with an activated physical uplink control channel spatial relationship, a path loss reference signal indicated in association with a sounding reference signal resource set, or a combination thereof.

[0123] Aspect 21: The method according to any one of Aspects 19-20, wherein the number of path loss reference signals included in the path loss reference signal subset is less than or equal to a threshold.

[0124] Aspect 22: A method according to any one of Aspects 1-7, wherein the one or more path loss reference signals are identified at least in part based on a determination that the configuration has not been received and at least in part based on a determination that the path loss reference signal activation command has not been received.

[0125] Aspect 23: The method according to aspect 22, wherein the one or more path loss reference signals include a synchronization signal block used to obtain a master information block.

[0126] Aspect 24: The method according to Aspect 22, wherein the one or more path loss reference signals are indicated by a base station or specified by a wireless communication standard.

[0127] Aspect 25: The method according to any one of the preceding aspects, wherein the one or more path loss reference signals are identified for a specific uplink channel or a specific uplink reference signal.

[0128] Aspect 26: A method according to any of the preceding aspects, wherein different uplink channels or different uplink reference signals are associated with at least one of the following: different configurations of corresponding path loss reference signal sets indicating corresponding uplink channels or uplink reference signals, different path loss reference signal activation commands, or a combination thereof.

[0129] Aspect 27: A method according to any one of the preceding aspects, wherein the configuration and the path loss reference signal activation command are specific to an uplink channel, an uplink reference signal, an uplink channel group, an uplink reference signal group, or a group comprising at least one uplink channel and at least one uplink reference signal.

[0130] Aspect 28: The method according to any one of the preceding aspects, wherein the one or more path loss reference signals are identified for all uplink channels and all uplink reference signals.

[0131] Aspect 29: The method according to any one of the preceding aspects, wherein the number of path loss reference signals included in the path loss reference signal set is at least partially based on whether a path loss reference signal activation command is enabled or disabled.

[0132] Aspect 30: A method according to Aspect 29, wherein if the path loss reference signal activation command is enabled, the number of path loss reference signals is allowed to be greater than a threshold, and if the path loss reference signal activation command is disabled, the number of path loss reference signals is not allowed to be greater than the threshold.

[0133] Aspect 31: The method according to any of the preceding aspects, wherein the configuration is included in a radio resource control message.

[0134] Aspect 32: The method according to any one of the preceding aspects, wherein the path loss reference signal activation command is a medium access control (MAC) control element (CE) message.

[0135] Aspect 33: The method according to any one of the preceding aspects, wherein the path loss reference signal set includes at least one channel state information reference signal.

[0136] Aspect 34: The method according to any one of the preceding aspects, wherein the one or more path loss reference signals include one or more default path loss reference signals.

[0137] Aspect 35: A method of wireless communication performed by a user equipment (UE), comprising: identifying one or more path loss reference signals based at least in part on a configuration indicating a path loss reference signal set, wherein the number of path loss reference signals included in the path loss reference signal set is based at least in part on whether a path loss reference signal activation command is enabled or disabled; and estimating path loss using the one or more path loss reference signals.

[0138] Aspect 36: A method according to Aspect 34, wherein if the path loss reference signal activation command is enabled, the number of path loss reference signals is allowed to be greater than a threshold, and if the path loss reference signal activation command is disabled, the number of path loss reference signals is not allowed to be greater than the threshold.

[0139] Aspect 37: An apparatus for wireless communication at a device, comprising: a processor; a memory coupled to the processor; and instructions, the instructions being stored in the memory and executable by the processor to cause the apparatus to perform a method according to one or more of Aspects 1-34.

[0140] Aspect 38: An apparatus for wireless communication, comprising a memory and one or more processors coupled to the memory, the memory and the one or more processors configured to perform the method according to one or more of aspects 1-34.

[0141] Aspect 39: An apparatus for wireless communication, comprising at least one unit for performing the method according to one or more of aspects 1-34.

[0142] Aspect 40: A non-transitory computer-readable medium storing code for wireless communication, the code comprising instructions executable by a processor to perform the method according to one or more of aspects 1-34.

[0143] Aspect 41: A non-transitory computer-readable medium storing an instruction set for wireless communication, the instruction set comprising one or more instructions, which, when executed by one or more processors of a device, causes the device to perform a method according to one or more of aspects 1-34.

[0144] Aspect 42: An apparatus for wireless communication at a device, comprising: a processor; a memory coupled to the processor; and instructions, the instructions being stored in the memory and executable by the processor to cause the apparatus to perform a method according to one or more of Aspects 35-36.

[0145] Aspect 43: An apparatus for wireless communication, comprising a memory and one or more processors coupled to the memory, the memory and the one or more processors configured to perform the method according to one or more of aspects 35-36.

[0146] Aspect 44: An apparatus for wireless communication, comprising at least one means for performing the method according to one or more of aspects 35-36.

[0147] Aspect 45: A non-transitory computer-readable medium storing code for wireless communication, the code comprising instructions executable by a processor to perform the method according to one or more of aspects 35-36.

[0148] Aspect 46: A non-transitory computer-readable medium storing an instruction set for wireless communication, the instruction set comprising one or more instructions, which when executed by one or more processors of a device causes the device to perform a method according to one or more aspects of aspects 35-36.

[0149] The foregoing disclosure provides illustration and description, but is not intended to be exhaustive or to limit the aspects to the precise forms disclosed. Modifications and variations are possible in light of the above disclosure or may be acquired from practice of the various aspects.

[0150] As used herein, the term "component" is intended to be broadly interpreted as hardware, firmware, and / or a combination of hardware and software. As used herein, a "processor" is implemented with hardware, firmware, and / or a combination of hardware and software.

[0151] As used herein, satisfying a threshold may refer to a value being greater than a threshold, greater than or equal to a threshold, less than a threshold, less than or equal to a threshold, equal to a threshold, not equal to a threshold, etc., depending on the context.

[0152] It will be apparent that the systems and / or methods described herein may be implemented with various forms of hardware, firmware, and / or combinations of hardware and software. The actual specialized control hardware or software code used to implement these systems and / or methods is not limiting in any respect. Therefore, the operation and behavior of the systems and / or methods are described herein without reference to specific software code, it being understood that software and hardware may be designed to implement the systems and / or methods based, at least in part, on the description herein.

[0153] Even if a specific combination of features is recorded in the claims and / or disclosed in the specification, these combinations are not intended to limit the disclosure of various aspects. In fact, many of these features can be combined in a manner that is not specifically recorded in the claims and / or specifically disclosed in the specification. Although each dependent claim listed below can only directly depend on one claim, the disclosure of various aspects includes the combination of each dependent claim with each other claim in the claim set. The phrase "at least one of" referring to the list of items refers to any combination of those items, including a single member. For example, "at least one of a, b or c" is intended to cover a, b, c, ab, ac, bc and abc, and any combination of the same elements in multiples (e.g., aa, aaa, aab, aac, abb, acc, bb, bbb, bbc, cc and ccc or any other ordering of a, b and c).

[0154] Any element, action or instruction used herein should not be interpreted as critical or necessary unless clearly described as such. In addition, as used herein, the articles "a" and "an" are intended to include one or more projects, and can be used interchangeably with "one or more". In addition, as used herein, the terms "set" and "group" are intended to include one or more projects (e.g., related projects, unrelated projects, combinations of related projects and unrelated projects, etc.), and can be used interchangeably with "one or more". In the case of only expecting one project, the phrase "only one" or similar language is used. In addition, as used herein, the terms "has", "have", "having" and / or similar terms are intended to be open terms. In addition, unless otherwise expressly stated, the phrase "based on" is intended to mean "based at least in part on".

Claims

1. A method of wireless communication performed by a user equipment (UE), comprising: identifying one or more path loss reference signals based at least in part on whether a configuration indicating a path loss reference signal set has been received and based at least in part on whether a path loss reference signal activation command has been received, wherein if the path loss reference signal activation command is enabled, the number of path loss reference signals included in the path loss reference signal set is allowed to be greater than a threshold, and if the path loss reference signal activation command is disabled, the number of path loss reference signals is not allowed to be greater than the threshold; and Path loss is estimated using the one or more path loss reference signals.

2. The method according to claim 1, wherein: The one or more path loss reference signals are identified based at least in part on a determination that the configuration has not been received and based at least in part on a determination that the path loss reference signal activation command has not been received.

3. The method according to claim 2, wherein: The one or more path loss reference signals include a synchronization signal block used to obtain a master information block.

4. The method according to claim 1, wherein: The one or more path loss reference signals are identified for a specific uplink channel or a specific uplink reference signal.

5. The method according to claim 1, wherein: The path loss reference signal activation command is a medium access control (MAC) control element (CE) message.

6. The method according to claim 1, wherein: The path loss reference signal set includes at least one channel state information reference signal.

7. The method according to claim 1, wherein: The one or more path loss reference signals include one or more default path loss reference signals.

8. The method according to claim 1, wherein: The one or more path loss reference signals are identified based at least in part on at least one of: Whether the path loss reference signal activation command is enabled, The number of path loss reference signals configured, Whether the number of configured path loss reference signals meets the threshold, or Its combination.

9. The method according to claim 1, wherein: The one or more path loss reference signals are identified based at least in part on a determination that the configuration has been received and based at least in part on a determination that the path loss reference signal activation command has been received.

10. The method according to claim 1, wherein: The one or more path loss reference signals are identified based at least in part on a determination that the configuration has been received and based at least in part on a determination that the path loss reference signal activation command has not been received.

11. The method according to claim 1, wherein: The configuration and the path loss reference signal activation command are specific to an uplink channel, an uplink reference signal, an uplink channel group, an uplink reference signal group, or a group including at least one uplink channel and at least one uplink reference signal.

12. A method of wireless communication performed by a user equipment (UE), comprising: identifying one or more path loss reference signals based at least in part on a configuration indicating a path loss reference signal set, wherein a number of path loss reference signals included in the path loss reference signal set is based at least in part on whether a path loss reference signal activation command is enabled or disabled, wherein if the path loss reference signal activation command is enabled, the number of path loss reference signals is allowed to be greater than a threshold, and if the path loss reference signal activation command is disabled, the number of path loss reference signals is not allowed to be greater than the threshold; and Path loss is estimated using the one or more path loss reference signals.

13. The method according to claim 12, wherein: The one or more path loss reference signals are identified based at least in part on a determination that the configuration has been received and based at least in part on a determination that the path loss reference signal activation command has been received.

14. The method according to claim 12, wherein: The one or more path loss reference signals are identified based at least in part on a determination that the configuration has been received and based at least in part on a determination that the path loss reference signal activation command has not been received.

15. The method according to claim 12, wherein: The one or more path loss reference signals are identified for a specific uplink channel or a specific uplink reference signal.

16. A user equipment (UE) for wireless communication, comprising: Memory; as well as one or more processors coupled to the memory, the one or more processors configured to: identifying one or more path loss reference signals based at least in part on whether a configuration indicating a path loss reference signal set has been received and based at least in part on whether a path loss reference signal activation command has been received, wherein if the path loss reference signal activation command is enabled, the number of path loss reference signals included in the path loss reference signal set is allowed to be greater than a threshold, and if the path loss reference signal activation command is disabled, the number of path loss reference signals is not allowed to be greater than the threshold; as well as Path loss is estimated using the one or more path loss reference signals.

17. The UE according to claim 16, wherein: The one or more path loss reference signals are identified based at least in part on a determination that the configuration has not been received and based at least in part on a determination that the path loss reference signal activation command has not been received.

18. The UE according to claim 17, wherein: The one or more path loss reference signals include a synchronization signal block used to obtain a master information block.

19. The UE according to claim 16, wherein: The one or more path loss reference signals are identified for a specific uplink channel or a specific uplink reference signal.

20. The UE according to claim 16, wherein: The path loss reference signal activation command is a medium access control (MAC) control element (CE) message.

21. The UE according to claim 16, wherein: The path loss reference signal set includes at least one channel state information reference signal.

22. The UE according to claim 16, wherein: The one or more path loss reference signals include one or more default path loss reference signals.

23. The UE according to claim 16, wherein: The one or more path loss reference signals are identified based at least in part on at least one of: Whether the path loss reference signal activation command is enabled, The number of path loss reference signals configured, Whether the number of configured path loss reference signals meets the threshold, or Its combination.

24. The UE according to claim 16, wherein: The one or more path loss reference signals are identified based at least in part on a determination that the configuration has been received and based at least in part on a determination that the path loss reference signal activation command has been received.

25. The UE according to claim 16, wherein: The one or more path loss reference signals are identified based at least in part on a determination that the configuration has been received and based at least in part on a determination that the path loss reference signal activation command has not been received.

26. The UE according to claim 16, wherein: The configuration and the path loss reference signal activation command are specific to an uplink channel, an uplink reference signal, an uplink channel group, an uplink reference signal group, or a group including at least one uplink channel and at least one uplink reference signal.

27. A user equipment (UE) for wireless communication, comprising: Memory; as well as one or more processors coupled to the memory, the one or more processors configured to: identifying one or more path loss reference signals based at least in part on a configuration indicating a path loss reference signal set, wherein a number of path loss reference signals included in the path loss reference signal set is based at least in part on whether a path loss reference signal activation command is enabled or disabled, wherein if the path loss reference signal activation command is enabled, the number of path loss reference signals is allowed to be greater than a threshold, and if the path loss reference signal activation command is disabled, the number of path loss reference signals is not allowed to be greater than the threshold; and Path loss is estimated using the one or more path loss reference signals.

28. The UE according to claim 27, wherein: The one or more path loss reference signals are identified based at least in part on a determination that the configuration has been received and based at least in part on a determination that the path loss reference signal activation command has not been received.

29. The UE according to claim 27, wherein: The one or more path loss reference signals are identified based at least in part on a determination that the configuration has not been received and based at least in part on a determination that the path loss reference signal activation command has not been received.

30. The UE according to claim 27, wherein: The one or more path loss reference signals are identified for a specific uplink channel or a specific uplink reference signal.

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