Common beam as default beam for aperiodic channel state information reference signal

Abstract

Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a user equipment (UE) can identify transmission configuration indicator (TCI) states associated with at least two signals or at least two communication channels. The UE can receive a downlink control information (DCI) that schedules an aperiodic channel state information reference signal (CSI-RS). The UE can determine, based at least in part on a scheduling offset between a transmission of the aperiodic CSI-RS and a scheduling DCI that schedules the aperiodic CSI-RS being less than a beam switching latency threshold, that the TCI states are to be used as default beams for receiving the aperiodic CSI-RS. Numerous other aspects are provided.

Description

[0001] Cross-references to related applications

[0002] This patent application claims priority to U.S. Provisional Patent Application No. 63 / 110,746, filed November 6, 2020, entitled “DETERMINATION OF A COMMON BEAM AS A DEFAULT BEAM FOR APERIODIC CHANNEL STATE INFORMATION REFERENCE SIGNALS,” and U.S. Non-Provisional Patent Application No. 17 / 452,621, filed October 28, 2021, entitled “COMMON BEAM AS A DEFAULT BEAM FOR APERIODIC CHANNEL STATE INFORMATION REFERENCE SIGNALS,” which are hereby expressly incorporated by reference.

[0003] open field

[0004] Various aspects of this disclosure generally relate to wireless communications and techniques and apparatus for using a shared beam as the default beam for aperiodic channel state information (CSI) reference signal (CSI-RS). Background Technology

[0005] Wireless communication systems are widely deployed to provide a variety of telecommunications services such as telephone, video, data, messaging, and broadcasting. Typical wireless communication systems employ multiple access technologies that can support communication with multiple users by sharing available system resources (e.g., bandwidth, transmit power). 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 an enhancement set of the Universal Mobile Telecommunications System (UMTS) mobile standard issued by the 3rd Generation Partnership Project (3GPP).

[0006] A wireless network may include several base stations (BSs) capable of supporting communication for several user equipments (UEs). UEs may communicate with the BS via downlinks and uplinks. A "downlink" (or "forward link") refers to the communication link from the BS to the UE, while an "uplink" (or "backlink") refers to the communication link from the UE to the BS. As will be described in more detail herein, a BS may be referred to as a B-node, gNB, access point (AP), radio headend, transmit / receive point (TRP), new radio (NR) BS, 5G B-node, etc.

[0007] The multiple access technologies mentioned above have been adopted in various telecommunications standards to provide a common protocol enabling different user equipment to communicate at the city, country, region, and even global levels. NR (which can also be referred to as 5G) is an enhancement set of the LTE mobile standard issued by 3GPP. NR is designed to better support mobile broadband Internet access by improving spectrum efficiency, reducing costs, improving service, utilizing new spectrum, and better integrating with other open standards that support beamforming, multiple-input multiple-output (MIMO) antenna technologies and carrier aggregation, using Orthogonal Frequency Division Multiplexing (OFDM) with a Cyclic Prefix (CP) on the downlink (DL) (CP-OFDM), and CP-OFDM and / or SC-FDM (e.g., also known as Discrete Fourier Transform Extended OFDM (DFT-s-OFDM)) on the uplink (UL). Further improvements to LTE, NR, and other radio access technologies remain useful as the demand for mobile broadband access continues to grow.

[0008] Overview

[0009] In some aspects, a wireless communication method performed by a user equipment (UE) includes: identifying a transmission configuration indicator (TCI) state associated with at least two signals or at least two communication channels; and using the TCI state as a default beam for receiving the aperiodic CSI-RS, based at least in part on a scheduling offset between a scheduling downlink control information (DCI) of a scheduling aperiodic channel state information reference signal (CSI-RS) and the transmission time of the aperiodic CSI-RS being less than a beam switching wait time threshold.

[0010] In some aspects, a wireless communication method performed by a base station includes: transmitting to a UE an indication that a TCI state associated with at least two signals or at least two communication channels is to be used as a default beam for aperiodic CSI-RS; and transmitting to the UE aperiodic CSI-RS to be received by the UE using the TCI state as the default beam.

[0011] In some aspects, a UE for wireless communication includes a memory and one or more processors coupled to the memory. The one or more processors may be configured to: identify a TCI state associated with at least two signals or at least two communication channels; and to use the TCI state as the default beam to receive the aperiodic CSI-RS, based at least in part on a scheduling offset between the scheduling DCI of the scheduling aperiodic CSI-RS and the transmission time of the aperiodic CSI-RS being less than a beam switching wait time threshold.

[0012] In some aspects, a base station for wireless communication may include a memory; and one or more processors coupled to the memory. The one or more processors may be configured to: transmit to a UE an indication regarding a TCI state associated with at least two signals or at least two communication channels to be used as a default beam for aperiodic CSI-RS; and transmit to the UE aperiodic CSI-RS to be received by the UE using the TCI state as the default beam.

[0013] In some aspects, a non-transient computer-readable medium storing a set of instructions for wireless communication includes one or more instructions that, when executed by one or more processors of a UE, cause the UE to: identify a TCI state associated with at least two signals or at least two communication channels; and use the TCI state as the default beam to receive the aperiodic CSI-RS, based at least in part on the scheduling offset between the scheduling DCI of the scheduling aperiodic CSI-RS and the transmission time of the aperiodic CSI-RS being less than a beam switching wait time threshold.

[0014] In some aspects, a non-transient computer-readable medium storing a set of instructions for wireless communication, the set of instructions comprising one or more instructions that, when executed by one or more processors of a base station, cause the base station to: transmit to a UE an indication regarding a TCI state associated with at least two signals or at least two communication channels to be used as a default beam for aperiodic CSI-RS; and transmit to the UE aperiodic CSI-RS to be received by the UE using the TCI state as the default beam.

[0015] In some aspects, an apparatus for wireless communication includes: means for identifying a TCI state associated with at least two signals or at least two communication channels; and means for using the TCI state as a default beam for receiving the aperiodic CSI-RS, based at least in part on the fact that the scheduling offset between the scheduling DCI of the scheduling aperiodic CSI-RS and the transmission time of the aperiodic CSI-RS is less than a beam switching wait time threshold.

[0016] In some aspects, an apparatus for wireless communication includes: means for transmitting to a UE an indication that a TCI state associated with at least two signals or at least two communication channels is to be used as a default beam for aperiodic CSI-RS; and means for transmitting to the UE aperiodic CSI-RS to be received by the UE using the TCI state as the default beam.

[0017] The aspects generally include, as substantially described herein with reference to the accompanying drawings and description, methods, apparatus, systems, computer program products, non-transient computer-readable media, user equipment, base stations, wireless communication equipment, and / or processing systems.

[0018] The foregoing has broadly outlined the features and technical advantages of the examples according to this disclosure in an effort to facilitate a better understanding of the following detailed description. Additional features and advantages will be described thereafter. The disclosed concepts and specific examples can be readily used as the basis for modifying or designing other structures for implementing the same purposes as this disclosure. Such equivalent constructions do not depart from the scope of the appended claims. The characteristics of the concepts disclosed herein, in both their organization and manner of operation, and their associated advantages, will be better understood by considering the following description in conjunction with the accompanying drawings. Each drawing is provided for illustrative and descriptive purposes and not for defining limitations on the claims.

[0019] While aspects are described herein by way of example, those skilled in the art will understand that such aspects can be implemented in many different arrangements and scenarios. The techniques described herein can be implemented using different platform types, devices, systems, shapes, sizes, and / or package arrangements. For example, some aspects may be implemented via integrated chip embodiments or other devices based on non-modular components (e.g., end-user equipment, vehicles, communication equipment, computing devices, industrial equipment, retail / shopping devices, medical devices, or AI-enabled devices). Aspects can be implemented in chip-level components, modular components, non-modular components, non-chip-level components, device-level components, or system-level components. Devices incorporating the described aspects and features may include additional components and features for implementing and practicing the claimed and described aspects. For example, the transmission and reception of wireless signals may include several components (e.g., hardware components, including antennas, radio frequency (RF) chains, power amplifiers, modulators, buffers, processors, interleavers, adders, or summers) for analog and digital purposes. The aspects described herein are intended to be practiced in a wide variety of devices, components, systems, distributed arrangements, or end-user equipment of various sizes, shapes, and configurations. Brief description of the attached diagram

[0021] To gain a more detailed understanding of the features described above in this disclosure, reference can be made to various aspects of the above brief overview, some of which are illustrated in the accompanying drawings. However, it should be noted that the drawings illustrate only certain typical aspects of this disclosure and should not be considered as limiting its scope, as other equivalent aspects are permissible in this description. Identical reference numerals in different drawings may identify the same or similar elements.

[0022] Figure 1 This is a diagram illustrating an example of a wireless network according to this disclosure.

[0023] Figure 2 This is a diagram illustrating an example of communication between a base station and a user equipment (UE) in a wireless network according to this disclosure.

[0024] Figure 3 An example logical architecture of a distributed radio access network (RAN) according to various aspects of this disclosure is explained.

[0025] Figure 4 This is a diagram illustrating an example of multiple transmit / receive point (multiple TRP) communication according to this disclosure.

[0026] Figure 5 This is a diagram illustrating an example of physical channels and reference signals in a wireless network according to this disclosure.

[0027] Figure 6 This is a diagram illustrating an example of using a shared beam as the default beam for aperiodic channel state information reference signal (CSI-RS) according to this disclosure.

[0028] Figure 7 and 8 This is a diagram illustrating an example process associated with using a shared beam as the default beam for aperiodic CSI-RS according to this disclosure.

[0029] Figure 9 and 10 This is a block diagram of an example device for wireless communication according to the present disclosure.

[0030] Detailed description

[0031] The various aspects of this disclosure are described more fully below with reference to the accompanying drawings. However, this disclosure may be implemented in many different forms and should not be construed as being limited to any specific structure or function given throughout this disclosure. Rather, these aspects are provided so that this disclosure will be thorough and complete, and will fully convey the scope of this disclosure to those skilled in the art. Based on the teachings herein, those skilled in the art will appreciate that the scope of this disclosure is intended to cover any aspect of this disclosure disclosed herein, whether implemented independently of or in combination with any other aspect of this disclosure. For example, any number of aspects set forth herein may be used to implement an apparatus or practice. Furthermore, the scope of this disclosure is intended to cover such apparatuses or methods practiced using additional structures, functionalities, or structures and functionalities that complement or supplement the various aspects of this disclosure set forth herein. It should be understood that any aspect of this disclosure disclosed herein may be implemented by one or more elements of the claims.

[0032] Several aspects of a telecommunications system will now be described with reference to various devices and techniques. These devices and techniques will be described in the following detailed description and explained in the accompanying drawings by various blocks, modules, components, circuits, steps, processes, algorithms, etc. (collectively, "elements"). These elements can 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.

[0033] In some scenarios, a base station may configure a User Equipment (UE) to use a default beam (or default Transmission Configuration Indicator (TCI) state) for aperiodic Channel State Information Reference Signals (CSI-RS) in certain situations. For example, if the scheduling offset between the scheduling downlink control information (DCI) (e.g., which schedules aperiodic CSI-RS) and the transmission time of the aperiodic CSI-RS scheduled by that scheduling DCI is less than a beam-switching waiting time threshold for the UE, the base station may configure the UE to use a default beam. For instance, the scheduling DCI may indicate the beam to be used for aperiodic CSI-RS. However, if the scheduling offset between the scheduling DCI and the transmission time of the aperiodic CSI-RS scheduled by that scheduling DCI is less than the beam-switching waiting time threshold, the UE may not have sufficient time to identify and / or switch to the beam identified by that scheduling DCI. Therefore, the base station may configure the UE to use a default beam in these scenarios. The UE can determine the default beam by identifying the beam with the lowest identifier in the latest monitored timeslot (CORESET). However, since the default beam follows the beam of the CORESET with the lowest identifier in the most recently monitored time slot, the default beam can change over time (e.g., across different time slots) due to the variability of the beam used by the CORESET. As a result, the default beam may be associated with poor signal strength, poor signal quality, poor transmit power, and / or may otherwise be unoptimized.

[0034] Some of the techniques and apparatus described herein implement the use of a shared beam (e.g., a TCI state associated with at least two signal or communication channels) as the default beam for aperiodic CSI-RS. For example, a UE may determine (or identify) a shared beam associated with two or more signal or communication channels. The UE may determine that this shared beam should be used as the default beam for aperiodic CSI-RS (e.g., the default beam will be used if the scheduling offset between the scheduling DCI and the transmission time of the aperiodic CSI-RS scheduled by the scheduling DCI is less than a beam-switching wait time threshold for the UE). The UE may determine that the aperiodic CSI-RS should be received using the default beam, and the UE may use the shared beam as the default beam to receive the aperiodic CSI-RS.

[0035] As a result, the UE can be implemented to use an optimized shared beam as the default beam for aperiodic CSI-RS, thereby improving communication efficiency. For example, since the default beam may change over time, it may not be optimized and / or may result in poor signal strength or quality. Since the shared beam can remain constant over time (and is optimized, as described above), using the shared beam as the default beam for aperiodic CSI-RS can lead to improved communication performance and reliability when the default beam is used for aperiodic CSI-RS. Furthermore, using the shared beam as the default beam for aperiodic CSI-RS can reduce beam management latency and overhead. Additionally, using an optimized shared beam as the default beam for aperiodic CSI-RS can improve downlink channel estimation (e.g., downlink CSI capture) and / or CSI-RS beam management procedures by enabling the UE 120 to use the optimized shared beam instead of the time-varying default beam to receive and / or measure aperiodic CSI-RS.

[0036] It should be noted that although the aspects herein may be described using terms commonly associated with 5G or NR radio access technology (RAT), the aspects of this disclosure may be applied to other RATs, such as 3G RAT, 4G RAT, and / or RATs after 5G (e.g., 6G).

[0037] Figure 1 This is a diagram illustrating an example of a wireless network 100 according to this disclosure. The wireless network 100 may be a 5G (NR) network and / or an LTE network, etc., or may include its elements. The wireless network 100 may include several base stations 110 (shown as BS110a, BS 110b, BS 110c, and BS 110d) and other network entities. A base station (BS) is an entity that communicates with a user equipment (UE) and may also be referred to as an NR BS, B-node, gNB, 5G B-node (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 the coverage area of ​​a BS and / or the BS subsystem serving that coverage area, depending on the context in which the term is used.

[0038] A BS can provide communication coverage for macrocells, picocells, femtocells, and / or another type of cell. Macrocells can cover a relatively large geographic area (e.g., a radius of several kilometers) and allow unrestricted access by UEs with a service subscription. Picocells can cover a relatively small geographic area and allow unrestricted access by UEs with a service subscription. Femtocells can cover a relatively small geographic area (e.g., a residential area) and allow restricted access by UEs associated with that femtocell (e.g., UEs in a Closed Subscriber Group (CSG)). A BS used for macrocells may be referred to as a macro BS. A BS used for picocells may be referred to as a pico BS. A BS used for femtocells may be referred to as a femto BS or a home BS. Figure 1 In the example shown, BS 110a can be a macro BS for macro cell 102a, BS 110b can be a pico BS for pico cell 102b, and BS 110c can be a femto BS for femto cell 102c. A BS can support one or more (e.g., three) cells. The terms “eNB,” “base station,” “NR BS,” “gNB,” “TRP,” “AP,” “B node,” “5G NB,” and “cell” are used interchangeably herein.

[0039] In some respects, the cell may not be stationary, and the geographical area of ​​the cell may move depending on the location of the mobile BS. In some respects, BSs may interconnect with each other and / or interconnect to 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 or virtual networks, using any suitable transport network).

[0040] The wireless network 100 may also include a relay station. A relay station is an entity capable of receiving data transmissions from an upstream station (e.g., a BS or a UE) and transmitting those data transmissions to a downstream station (e.g., a UE or a BS). A relay station may also be a UE capable of relaying transmissions for other UEs. Figure 1 In the example shown, relay BS 110d can communicate with macro BS 110a and UE 120d to facilitate communication between BS 110a and UE 120d. A relay BS can also be referred to as a relay station, relay base station, relay, etc.

[0041] Wireless network 100 can be a heterogeneous network comprising different types of Base Stations (BSs) such as 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 wireless network 100. For example, macro BSs may have high transmit power levels (e.g., 5 to 40 watts), while pico BSs, femto BSs, and relay BSs may have lower transmit power levels (e.g., 0.1 to 2 watts).

[0042] Network controller 130 can be coupled to a set of Base Stations (BSs) and can provide coordination and control over these BSs. Network controller 130 can communicate with each BS via backhaul. These BSs can also communicate with each other directly or indirectly via wireless or wired backhaul.

[0043] UE 120 (e.g., 120a, 120b, 120c) may be distributed throughout the wireless network 100, and each UE may be stationary or mobile. UE may also be referred to as an access terminal, terminal, mobile station, subscriber unit, station, etc. UE may be a cellular phone (e.g., a smartphone), personal digital assistant (PDA), wireless modem, wireless communication device, handheld device, laptop computer, cordless phone, wireless local loop (WLL) station, tablet, camera, gaming device, netbook, smartbook, ultrabook, medical device or equipment, biometric sensor / device, wearable device (smartwatch, smart clothing, smart glasses, smart wristband, smart jewelry (e.g., smart ring, smart bracelet)), entertainment device (e.g., music or video device, or satellite radio), vehicle component or sensor, smart meter / sensor, industrial manufacturing equipment, GPS device, or any other suitable device configured to communicate via wireless or wired media.

[0044] Some UEs may be considered machine-type communication (MTC) devices or evolved or enhanced machine-type communication (eMTC) UEs. MTC and eMTC UEs include, for example, robots, drones, remote devices, sensors, instruments, monitors, and / or location tags that can communicate with a base station, another device (e.g., a remote device), or some other entity. Wireless nodes may provide connectivity to or to a network (e.g., a wide area network, such as the Internet or a cellular network) via wired or wireless communication links, for example. Some UEs may be considered Internet of Things (IoT) devices and / or may be implemented as NB-IoT (Narrowband Internet of Things) devices. Some UEs may be considered customer premises equipment (CPE). UE 120 may be included within a housing that houses components of UE 120, such as processor components and / or memory components. In some aspects, the processor components and memory components may be coupled together. For example, the processor components (e.g., one or more processors) and memory components (e.g., memory) may be operatively coupled, communicatively coupled, electronically coupled, and / or electrically coupled.

[0045] Generally, any number of wireless networks can be deployed in a given geographical area. Each wireless network can support a specific RAT and can operate on one or more frequencies. A RAT can also be referred to as a radio technology, air interface, etc. A frequency can also be referred to as a carrier, frequency channel, etc. Each frequency can support a single RAT in a given geographical area to avoid interference between wireless networks using different RATs. In some cases, NR or 5G RAT networks can be deployed.

[0046] In some respects, 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). For example, UEs 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 or vehicle-to-infrastructure (V2I) protocols), and / or mesh networks. In this scenario, UEs 120 may perform scheduling operations, resource selection operations, and / or other operations described elsewhere herein as performed by base station 110.

[0047] Devices in the wireless network 100 can communicate using the electromagnetic spectrum, which can be subdivided into various categories, bands, channels, etc., based on frequency or wavelength. For example, devices in the wireless network 100 can communicate using an operating band with a first frequency range (FR1) and / or an operating band with a second frequency range (FR2), where the first frequency range (FR1) spans from 410 MHz to 7.125 GHz and the second frequency range (FR2) spans from 24.25 GHz to 52.6 GHz. The frequencies between FR1 and FR2 are sometimes referred to as intermediate frequency bands. Although a portion of FR1 is greater than 6 GHz, FR1 is often referred to as the "sub-6 GHz band." Similarly, although different from the extremely high frequency (EHF) band (30 GHz–300 GHz) designated as the "millimeter wave" band by the International Telecommunication Union (ITU), FR2 is often referred to as the "millimeter wave" band. Therefore, unless otherwise stated, it should be understood that, if used herein, the term "sub-6GHz," etc., can broadly refer to frequencies less than 6GHz, frequencies within FR1, and / or intermediate frequency band frequencies (e.g., greater than 7.125GHz). Similarly, unless otherwise stated, it should be understood that, if used herein, the term "millimeter wave," etc., can broadly refer to frequencies within the EHF band, frequencies within FR2, and / or intermediate frequency band frequencies (e.g., less than 24.25GHz). It is conceivable that the frequencies included in FR1 and FR2 can be modified, and the techniques described herein are applicable to those modified frequency ranges.

[0048] As indicated above, Figure 1 This is provided as an example. Other examples may differ from the one provided. Figure 1 The example described.

[0049] Figure 2 This is a diagram illustrating an example 200 of communication between a base station 110 and a UE 120 in a wireless network 100 according to this disclosure. The base station 110 may be equipped with T antennas 234a to 234t, while the UE 120 may be equipped with R antennas 252a to 252r, wherein generally T≥1 and R≥1.

[0050] At base station 110, transmit processor 220 can receive data destined for one or more UEs from data source 212, select one or more modulation and coding schemes (MCS) for each UE based at least in part on channel quality indicators (CQI) received from each UE, process (e.g., encode and modulate) the data for each UE based at least in part on the MCS selected for each UE, and provide data symbols for all UEs. Transmit processor 220 can also process system information (e.g., semi-static resource allocation information (SRPI)) and control information (e.g., CQI requests, grants, and / or upper-layer signaling), and provide overhead symbols and control symbols. Transmit processor 220 can also generate reference symbols for reference signals (e.g., cell-specific reference signals (CRS) or demodulation reference signals (DMRS)) and synchronization signals (e.g., primary synchronization signal (PSS) or secondary synchronization signal (SSS)). The transmit (TX) multiple-input multiple-output (MIMO) processor 230 can perform spatial processing (e.g., precoding) on ​​data symbols, control symbols, overhead symbols, and / or reference symbols, where applicable, and can provide T output symbol streams to T modulators (MODs) 232a to 232t. Each modulator 232 can process its respective output symbol stream (e.g., for OFDM) to obtain an output sample stream. Each modulator 232 can further process (e.g., convert to analog, amplify, filter, and up-convert) the output sample stream to obtain a downlink signal. The T downlink signals from modulators 232a to 232t can be transmitted via T antennas 234a to 234t, respectively.

[0051] At UE 120, antennas 252a to 252r can receive downlink signals from base station 110 and / or other base stations and can provide the received signals to demodulators (DEMODs) 254a to 254r respectively. Each demodulator 254 can condition (e.g., filter, amplify, downconvert, and digitize) the received signal to obtain an input sample. Each demodulator 254 can further process the input sample (e.g., for OFDM) to obtain received symbols. MIMO detector 256 can obtain the received symbols from all R demodulators 254a to 254r, perform MIMO detection on these received symbols where applicable, and provide detected symbols. Receiver processor 258 can process (e.g., demodulate and decode) these 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 term "controller / processor" can refer to one or more controllers, one or more processors, or a combination thereof. The channel processor can determine parameters such as Reference Signal Received Power (RSRP), Received Signal Strength Indicator (RSSI), Reference Signal Received Quality (RSRQ), and / or CQI. In some respects, one or more components of the UE 120 may be included in the housing 284.

[0052] Network controller 130 may include communication unit 294, controller / processor 290, and memory 292. Network controller 130 may include one or more devices, such as those in a core network. Network controller 130 may communicate with base station 110 via communication unit 294.

[0053] Antennas (e.g., antennas 234a to 234t and / or antennas 252a to 252r) may include, or be included therein, one or more antenna panels, antenna groups, antenna element sets, and / or antenna arrays. Antenna panels, antenna groups, antenna element sets, and / or antenna arrays may include one or more antenna elements. Antenna panels, antenna groups, antenna element sets, and / or antenna arrays may include coplanar antenna element sets and / or non-coplanar antenna element sets. Antenna panels, antenna groups, antenna element sets, and / or antenna arrays may include antenna elements within a single housing and / or multiple antenna elements within housings. Antenna panels, antenna groups, antenna element sets, and / or antenna arrays may include elements coupled to one or more transmission and / or reception components (such as...). Figure 2 One or more antenna elements (one or more components).

[0054] On the uplink, at UE 120, transmit processor 264 can receive and process data from data source 262 and control information from controller / processor 280 (e.g., reports including RSRP, RSSI, RSRQ, and / or CQI). Transmit processor 264 can also generate reference symbols for one or more reference signals. Symbols from transmit processor 264 may be pre-encoded by TX MIMO processor 266 where applicable, further processed by modulators 254a to 254r (e.g., for DFT-s-OFDM or CP-OFDM), and transmitted to base station 110. In some aspects, modulators and demodulators (e.g., MOD / DEMOD 254) of UE 120 may be included in the modem of UE 120. In some aspects, UE 120 includes a transceiver. The transceiver may include any combination of antennas 252, modulators and / or demodulators 254, MIMO detectors 256, receiver processors 258, transmitter processors 264, and / or TX MIMO processors 266. The transceiver may be used by a processor (e.g., controller / processor 280) and memory 282 to perform aspects of any of the methods described herein, for example, as referenced. Figure 6-10 As described.

[0055] At base station 110, uplink signals from UE 120 and other UEs can be received by antenna 234, processed by demodulator 232, detected by MIMO detector 236 where applicable, and further processed by receiver processor 238 to obtain decoded data and control information transmitted by UE 120. Receiver processor 238 can provide the decoded data to data sink 239 and the decoded control information to controller / processor 240. Base station 110 may include communication unit 244 and communicate with network controller 130 via communication unit 244. Base station 110 may include scheduler 246 to schedule UE 120 for downlink and / or uplink communications. In some aspects, the modulator and demodulator (e.g., MOD / DEMOD 232) of base station 110 may be included in the modem of base station 110. In some aspects, base station 110 includes a transceiver. The transceiver may include any combination of antennas 234, modulators and / or demodulators 232, MIMO detectors 236, receiver processors 238, transmitter processors 220, and / or TX MIMO processors 230. The transceiver may be used by a processor (e.g., controller / processor 240) and memory 242 to perform aspects of any of the methods described herein, for example, as referenced. Figure 6-10 As described.

[0056] The controller / processor 240 of base station 110, the controller / processor 280 of UE 120, and / or Figure 2 Any other component may perform one or more techniques associated with using a shared beam as the default beam for the aperiodic channel state information reference signal (CSI-RS), as described in more detail elsewhere herein. For example, the controller / processor 240 of base station 110, the controller / processor 280 of UE 120, and / or Figure 2 Any other component that can execute or direct, for example Figure 7 Process 700 Figure 8 The operation of process 800 and / or other processes as described herein. Memory 242 and 282 may store data and program code 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 (e.g., code and / or program code) for wireless communication. For example, when executed by one or more processors of base station 110 and / or UE 120 (e.g., directly executed, or executed after compilation, transformation, and / or interpretation), the one or more processors, UE 120, and / or base station 110 may cause the one or more processors, UE 120, and / or base station 110 to perform or direct, for example... Figure 7 Process 700 Figure 8 The operation of process 800, and / or other processes described herein. In some respects, the execution instructions may include run instructions, translate instructions, compile instructions, and / or interpret instructions, etc.

[0057] In some aspects, UE 120 includes: means for identifying a Transmission Configuration Indicator (TCI) state associated with at least two signals or at least two communication channels; means for determining, at least in part, that the TCI state should be used as the default beam for the aperiodic CSI-RS based on a scheduling offset between the scheduling downlink control information (DCI) for scheduling the aperiodic CSI-RS and the transmission time of the aperiodic CSI-RS being less than a beam switching wait time threshold; and / or means for using the TCI state as the default beam to receive the aperiodic CSI-RS. Means for UE 120 to perform the operations described herein may include, for example, one or more of antenna 252, demodulator 254, MIMO detector 256, receive processor 258, transmit processor 264, TX MIMO processor 266, modulator 254, controller / processor 280, and / or memory 282.

[0058] In some aspects, UE 120 includes means for identifying the TCI state based at least in part on implicit rules. In some aspects, UE 120 includes means for determining that the TCI state should always be used as the default beam by the UE if the scheduling offset between the scheduling DCI and the transmission time of the aperiodic CSI-RS scheduled by the scheduling DCI is less than a beam switching wait time threshold.

[0059] In some aspects, UE 120 includes means for receiving from a base station an indication regarding the TCI state to be used as the default beam for aperiodic CSI-RS. In some aspects, UE 120 includes means for receiving the indication via DCI communication. In some aspects, UE 120 includes means for receiving the indication via Media Access Control (MAC) Control Element (MAC-CE) communication. In some aspects, UE 120 includes means for receiving the indication via Radio Resource Control (RRC) communication.

[0060] In some aspects, UE 120 includes means for identifying the TCI state at least in part based on explicit rules. In some aspects, UE 120 includes means for receiving from a base station an indication that the TCI state is to be used as the default beam for aperiodic CSI-RS. In some aspects, UE 120 includes means for receiving the indication via DCI communication. In some aspects, UE 120 includes means for receiving the indication via MAC-CE communication. In some aspects, UE 120 includes means for receiving the indication via RRC communication.

[0061] In some respects, UE 120 includes means for receiving, in the same signal, an indication of the TCI state and an indication of whether the TCI state is to be used as the default beam for aperiodic CSI-RS.

[0062] In some aspects, UE 120 includes means for determining the TCI state to be used in a multiple transmit receive point (multiple TRP) configuration. In some aspects, UE 120 includes means for determining the TCI state associated with a TRP in the multiple TRP configuration to be used as the default beam for the aperiodic CSI-RS associated with that TRP.

[0063] In some aspects, UE 120 includes means for receiving from a base station an indication that the TCI state should not be used as the default beam for aperiodic CSI-RS. In some aspects, UE 120 includes means for determining another default beam for aperiodic CSI-RS based at least in part on a quasi-co-location assumption of the control resource set having the lowest identifier in the most recently monitored time slot of the active downlink bandwidth portion. In some aspects, UE 120 includes means for determining another TCI state determined before determining the co-location beam to be used as a new default beam for aperiodic CSI-RS.

[0064] In some aspects, base station 110 includes means for transmitting to the UE an indication regarding a TCI state associated with at least two signal or communication channels to be used as the default beam for aperiodic CSI-RS; and / or means for transmitting to the UE aperiodic CSI-RS to be received by the UE using the TCI state as the default beam. Means for base station 110 to perform the operations described herein may include, for example, one or more of the following: transmit processor 220, TX MIMO processor 230, modulator 232, antenna 234, demodulator 232, MIMO detector 236, receive processor 238, controller / processor 240, memory 242, or scheduler 246.

[0065] In some aspects, base station 110 includes means for transmitting to the UE an indication that the UE will use the default beam for the aperiodic CSI-RS if the scheduling offset between the scheduling DCI and the transmission time of the aperiodic CSI-RS scheduled by the scheduling DCI is less than a beam switching wait time threshold.

[0066] In some aspects, base station 110 includes means for transmitting an indication via DCI communication. In some aspects, base station 110 includes means for transmitting an indication via MAC-CE communication. In some aspects, base station 110 includes means for transmitting an indication via RRC communication.

[0067] In some respects, base station 110 includes means for transmitting an indication of TCI status to the UE.

[0068] In some respects, base station 110 includes means for transmitting in the same signal an indication of the TCI status and an indication of whether a shared beam is to be used as the default beam for aperiodic CSI-RS.

[0069] In some respects, base station 110 includes means for determining the TCI state to be used in multiple multi-TRP configurations.

[0070] In some aspects, base station 110 includes means for transmitting to the UE an indication of the TCI state associated with a TRP in a multi-TRP configuration to be used as the default beam for the aperiodic CSI-RS associated with that TRP.

[0071] In some respects, base station 110 includes means for transmitting to the UE an indication that the TCI state is no longer being used as the default beam.

[0072] In some aspects, base station 110 includes means for determining the TCI state associated with at least two signal or communication channels.

[0073] although Figure 2 The boxes in the diagram are interpreted as different components, but the functions described above with respect to these boxes can be implemented using a single hardware component, software component, or combination of components. For example, the functions described with respect to transmit processor 264, receive processor 258, and / or TX MIMO processor 266 can be performed by controller / processor 280 or under the control of controller / processor 280.

[0074] As indicated above, Figure 2 This is provided as an example. Other examples may differ from the one provided. Figure 2 The example described.

[0075] Figure 3 An example logical architecture of a distributed RAN 300 based on various aspects of this disclosure is explained.

[0076] 5G access node 305 may include access node controller 310. Access node controller 310 may be the central unit (CU) of a distributed RAN 300. In some aspects, backhaul interfaces to the 5G core network 315 may be terminated at access node controller 310. 5G core network 315 may include 5G control plane components 320 and 5G user plane components 325 (e.g., 5G gateways), and backhaul interfaces for one or both of the 5G control plane and 5G user plane may be terminated at access node controller 310. Additionally or alternatively, backhaul interfaces to one or more neighboring access nodes 330 (e.g., another 5G access node 305, LTE access node, etc.) may be terminated at access node controller 310.

[0077] Access node controller 310 may include one or more TRPs 335 and / or be able to communicate with one or more TRPs (e.g., via an F1 control (F1-C) interface and / or an F1 user (F1-U) interface). TRP 335 may be a distributed unit (DU) of the distributed RAN 300. In some aspects, TRP 335 may correspond to the above combination. Figure 1The described base station 110. For example, different TRPs 335 may be included in different base stations 110. Additionally or alternatively, multiple TRPs 335 may be included in a single base station 110. In some aspects, base station 110 may include a CU (e.g., access node controller 310) and / or one or more DUs (e.g., one or more TRPs 335). In some cases, TRPs 335 may be referred to as cells, panels, antenna arrays, arrays, etc.

[0078] The TRP 335 can be connected to a single access node controller 310 or multiple access node controllers 310. In some aspects, the architecture of the distributed RAN 300 can have dynamically configured split logical functions. For example, the Packet Data Convergence Protocol (PDCP) layer, Radio Link Control (RLC) layer, Media Access Control (MAC) layer, etc., can be configured to terminate at the access node controller 310 or the TRP 335.

[0079] In some aspects, multiple TRP 335s can transmit communication (e.g., the same or different communication) in the same Transmission Time Interval (TTI) (e.g., time slots, mini-slots, subframes, symbols, etc.) or in different TTIs using different Quasi-Co-location (QCL) relationships (e.g., different spatial parameters, different Transmission Configuration Indicator (TCI) states, different precoding parameters, different beamforming parameters, etc.). In some aspects, the TCI state can be used to indicate one or more QCL relationships. A beam can be associated with a TCI state. The TCI state can indicate the directivity or characteristics of the beam, such as one or more QCL attributes of a downlink beam. QCL attributes can include, for example, Doppler shift, Doppler spread, average delay, delay spread, or spatial reception parameters, etc. TRP 335s can be configured to serve traffic to the UE individually (e.g., using dynamic selection) or jointly (e.g., using joint transmission with one or more other TRP 335s).

[0080] As indicated above, Figure 3 This is provided as an example. Other examples may differ from the one provided. Figure 3 The example described.

[0081] Figure 4 This is a diagram illustrating example 400 of multi-TRP communication according to this disclosure. In some aspects, multi-TRP communication may be referred to as multi-panel communication. For example... Figure 4 As shown, multiple TRPs 405 can communicate with the same UE 120. The TRPs 405 can correspond to the combinations described above. Figure 3 The TRP 335 described.

[0082] Multiple TRPs 405 (shown as TRP A and TRP B) can communicate with the same UE 120 in a coordinated manner (e.g., using coordinated multicast, etc.) to improve reliability, increase throughput, etc. Such communication can be coordinated between TRPs 405 via an interface between them (e.g., a backhaul interface, access node controller 310, etc.). When TRPs 405 are co-located at the same base station 110 (e.g., when TRPs 405 are different antenna arrays or panels of the same base station 110), the interface can have lower latency and / or higher capacity, and when TRPs 405 are located at different base stations 110, the interface can have higher latency and / or lower capacity (compared to co-location). Different TRPs 405 can communicate with the UE 120 using different QCL relationships (e.g., different TCI states), different demodulation reference signal (DMRS) ports, (e.g., different layers in multilayer communication), etc.

[0083] In the first multi-TRP transmission mode (e.g., mode 1), a single physical downlink control channel (PDCCH) can be used to schedule downlink data communication for a single physical downlink shared channel (PDSCH). In this scenario, multiple TRPs 405 (e.g., TRP A and TRP B) can transmit communication to UE 120 on the same PDSCH. For example, communication can be transmitted using a single codeword having different spatial layers for different TRPs 405 (e.g., one codeword maps to a first layer set transmitted by a first TRP 405 and to a second layer set transmitted by a second TRP 405). As another example, communication can be transmitted using multiple codewords, where different codewords are transmitted by different TRPs 405 (e.g., using different layer sets). In either case, different TRPs 405 can use different QCL relationships (e.g., different TCI states) for different DMRS ports corresponding to different layers. For example, the first TRP 405 may use a first QCL relationship or a first TCI state for a first DMRS port set corresponding to a first layer set, and the second TRP 405 may use a second (different) QCL relationship or a second (different) TCI state for a second (different) DMRS port set corresponding to a second (different) layer set. In some aspects, the TCI state in the downlink control information (DCI) (e.g., transmitted on the PDCCH, such as DCI format 1_0, DCI format 1_1, etc.) may indicate a first QCL relationship (e.g., by indicating a first TCI state) and a second QCL relationship (e.g., by indicating a second TCI state). The first and second TCI states may be indicated using the TCI field in the DCI. Generally, in this multi-TRP transmission mode (e.g., mode 1), the TCI field may indicate a single TCI state (for a single TRP transmission) or multiple TCI states (for multi-TRP transmissions as discussed herein).

[0084] In the second multi-TRP transmission mode (e.g., mode 2), multiple PDCCHs can be used to schedule downlink data communication for multiple corresponding PDSCHs (e.g., one PDCCH per PDSCH). In this case, a first PDCCH can be scheduled to transmit a first codeword by a first TRP 405, and a second PDCCH can be scheduled to transmit a second codeword by a second TRP 405. Furthermore, a first DCI (e.g., transmitted by the first TRP 405) can be scheduled to communicate with a first PDSCH associated with a first DMRS port set having a first QCL relationship (e.g., indicated by a first TCI status) for the first TRP 405, and a second DCI (e.g., transmitted by the second TRP 405) can be scheduled to communicate with a second PDSCH associated with a second DMRS port set having a second QCL relationship (e.g., indicated by a second TCI status) for the second TRP 405. In this scenario, the DCI (e.g., having DCI format 1_0, DCI format 1_1, etc.) can indicate the corresponding TCI state for TRP 405 corresponding to the DCI. The TCI field of the DCI indicates the corresponding TCI state (e.g., the TCI field of the first DCI indicates the first TCI state and the TCI field of the second DCI indicates the second TCI state).

[0085] As indicated above, Figure 4 This is provided as an example. Other examples may differ from the one provided. Figure 4 The example described.

[0086] Figure 5 This is a diagram illustrating example 500 of the physical channels and reference signals in a wireless network according to this disclosure. For example... Figure 5 As shown, the downlink channel and downlink reference signal can carry information from base station 110 to UE 120, and the uplink channel and uplink reference signal can carry information from UE 120 to base station 110.

[0087] As shown in the figure, downlink channels may include examples such as a Physical Downlink Control Channel (PDCCH) carrying downlink control information (DCI), a Physical Downlink Shared Channel (PDSCH) carrying downlink data, or a Physical Broadcast Channel (PBCH) carrying system information. In some aspects, PDCCH communication can be scheduled by PDSCH communication. As further shown, uplink channels may include a Physical Uplink Control Channel (PUCCH) carrying uplink control information (UCI), a Physical Uplink Shared Channel (PUSCH) carrying uplink data, or a Physical Random Access Channel (PRACH) for initial network access, and other examples. In some aspects, UE 120 may transmit acknowledgment (ACK) or negation (NACK) feedback (e.g., ACK / NACK feedback or ACK / NACK information) in the UCI on the PUCCH and / or PUSCH.

[0088] As further illustrated, downlink reference signals may include synchronization signal blocks (SSBs), channel state information (CSI) reference signals (CSI-RS), demodulation reference signals (DMRS), positioning reference signals (PRS), or phase tracking reference signals (PTRS), among other examples. Also as illustrated, uplink reference signals may include probe reference signals (SRS), DMRS, or PTRS, among other examples.

[0089] SSBs can carry information for initial network acquisition and synchronization, such as the primary synchronization signal (PSS), secondary synchronization signal (SSS), PBCH, and PBCH DMRS. SSBs are sometimes referred to as synchronization signal / PBCH (SS / PBCH) blocks. In some respects, base station 110 can transmit multiple SSBs on multiple corresponding beams, and SSBs can be used for beam selection.

[0090] CSI-RS can carry information for downlink channel estimation (e.g., downlink CSI capture), which can be used for scheduling, link adaptation, beam management, and other examples. Base station 110 can configure a set of CSI-RS for UE 120, and UE 120 can measure the configured set of CSI-RS. Based at least in part on these measurements, UE 120 can perform channel estimation and report channel estimation parameters to base station 110 (e.g., in a CSI report), such as Channel Quality Indicator (CQI), Precoding Matrix Indicator (PMI), CSI-RS Resource Indicator (CRI), Layer Indicator (LI), Rank Indicator (RI), or Reference Signal Received Power (RSRP), and other examples. Base station 110 can use the CSI report to select transmission parameters for downlink communication to UE 120, such as the number of transport layers (e.g., rank), precoding matrix (e.g., precoder), modulation and coding scheme (MCS), or refined downlink beam (e.g., using a beam refinement procedure or beam management procedure), and other examples.

[0091] DMRS can carry information used to estimate radio channels for demodulating associated physical channels (e.g., PDCCH, PDSCH, PBCH, PUCCH, or PUSCH). The design and mapping of DMRS can be specific to the physical channels it is used to estimate. DMRS is UE-specific, can be beamformed, can be confined to scheduled resources (e.g., not transmitted over broadband), and can be transmitted only when necessary. As shown, DMRS is used for both downlink and uplink communication.

[0092] PTRS can carry information for compensating oscillator phase noise. Typically, phase noise increases with the oscillator carrier frequency. Therefore, PTRS can be used to mitigate phase noise at high carrier frequencies (such as millimeter-wave frequencies). PTRS can be used to track the phase of the local oscillator and enables suppression of phase noise and common phase error (CPE). As shown, PTRS is used for both downlink communication (e.g., on the PDSCH) and uplink communication (e.g., on the PUSCH).

[0093] The PRS can carry information used to perform timing or distance measurements for the UE 120, at least in part, based on signals transmitted by base station 110, to improve Observed Time Difference of Arrival (OTDOA) positioning performance. For example, the PRS can be a pseudo-random quadrature phase shift keying (QPSK) sequence mapped diagonally with frequency and time offsets to avoid conflicts with reference signals and control channels (e.g., PDCCH) that vary by cell. Generally, the PRS can be designed to improve the detectability of the UE 120, which may need to detect downlink signals from multiple neighboring base stations to perform OTDOA-based positioning. Accordingly, the UE 120 can receive the PRS from multiple cells (e.g., a reference cell and one or more neighboring cells) and can report the Reference Signal Time Difference (RSTD) at least in part based on OTDOA measurements associated with the PRS received from the multiple cells. In some aspects, base station 110 can subsequently calculate the positioning of the UE 120 at least in part based on the RSTD measurements reported by the UE 120.

[0094] The SRS can carry information for uplink channel estimation, which can be used for scheduling, link adaptation, precoder selection, beam management, and other examples. Base station 110 can configure one or more SRS resource sets for UE 120, and UE 120 can transmit SRS on the configured SRS resource sets. The SRS resource sets can have configured uses, such as uplink CSI capture, downlink CSI capture for reciprocity-based operation, uplink beam management, and other examples. Base station 110 can measure the SRS, can perform channel estimation at least in part based on these measurements, and can use the SRS measurements to configure communication with UE 120.

[0095] As indicated above, Figure 5 This is provided as an example. Other examples may differ from the one provided. Figure 5 The example described.

[0096] In some cases, a shared beam can be used for at least two signals or communication channels in a wireless communication system to reduce beam management latency and overhead. A shared beam can be a beam associated with two or more signals or communication channels (e.g., a TCI state) (e.g., the same beam is used when either of the two or more signals or communication channels is used for transmission and / or reception). For example, the two or more signals or communication channels can be any combination of data signals, data channels (e.g., PDSCH and / or PUSCH), control signals, control channels (e.g., PDCCH, PUCCH, and / or PRACH), reference signals (e.g., CSI-RS, SSB, PRS, SRS, and / or DMRS), downlink signals or channels, and / or uplink signals or channels. "Shared beam" can refer to a TCI state associated with two or more signals or communication channels. Shared beam can be optimized, at least in part, based on one or more parameters. For example, a shared beam can be refined into a sharp or narrow beam (e.g., beamforming procedures can be applied to the shared beam to improve transmit power and / or received signal strength associated with the beam), which can improve the link budget for certain UEs (e.g., UEs with limited mobility or moving at low speeds). In another example, a shared beam can be optimized by selecting a wide beamwidth, which can improve robustness in high mobility or obstructed scenarios.

[0097] In multi-beam operations (e.g., for FR 1 and / or FR 2 operations), efficiency in beam management enables reduced beam management latency and overhead. This allows for higher intra-cell mobility and inter-cell mobility in Layer 1 or Layer 2 (L1 / L2) centralized cells, and / or an expanded number of configured TCI states. For example, using a shared beam for data, control transmission, and reception allows for such efficiency in various scenarios, such as in-band carrier aggregation. Other techniques that allow for efficiency in beam management procedures may include using a unified TCI framework for downlink and uplink beam indication (e.g., using TCI states to identify downlink and uplink beams), or using enhanced signaling mechanisms that improve latency and efficiency by replacing Radio Resource Control (RRC) signaling with increased use of dynamic control signaling.

[0098] In some scenarios, the base station can configure the UE to use a default beam (or default TCI state) for aperiodic CSI-RS in certain situations (e.g., in RRC configuration). Aperiodic CSI-RS can refer to CSI-RS dynamically scheduled by the DCI. For example, if the scheduling offset between the scheduling DCI (e.g., which schedules aperiodic CSI-RS) and the transmission time of the aperiodic CSI-RS scheduled by that scheduling DCI is less than the UE's beam-switching waiting time threshold, the base station can configure the UE to use a default beam. For example, the scheduling DCI can indicate the beam to be used for aperiodic CSI-RS. However, if the scheduling offset between the scheduling DCI and the transmission time of the aperiodic CSI-RS scheduled by that scheduling DCI is less than the beam-switching waiting time threshold, the UE may not have enough time to identify and / or switch to the beam identified by that scheduling DCI. Therefore, the base station can configure the UE to use a default beam in these scenarios. The UE can determine the default beam by identifying the beam with the lowest identifier in the control resource set (CORESET) of the most recently monitored time slot. The determination of the default beam by the UE may be specified or otherwise defined by a wireless communication standard, such as 3GPP Technical Specification 38.214, 5.2.1.5.1. However, since the default beam follows the beam of the CORESET with the lowest identifier in the most recently monitored time slot, the default beam may change over time (e.g., across different time slots) due to the variability of the beam used by the CORESET. As a result, the default beam may be associated with poor signal strength, poor signal quality, poor transmit power, and / or may otherwise be unoptimized.

[0099] Some of the techniques and apparatus described herein implement the determination of a shared beam (e.g., a TCI state associated with at least two signals and / or at least two communication channels) as the default beam for aperiodic CSI-RS. For example, a UE can determine (or identify) a shared beam associated with two or more signals or communication channels. The UE can use the shared beam (e.g., a TCI state) to receive aperiodic CSI-RS.

[0100] As a result, the UE can use an optimized shared beam as the default beam for aperiodic CSI-RS, thereby improving communication efficiency. For example, since the default beam can change over time, it may not be optimized and / or may result in poor signal strength or quality. Since the shared beam can remain constant over time (and is optimized, as described above), using it as the default beam for aperiodic CSI-RS when the default beam is used can lead to improved communication performance and reliability. Furthermore, using a shared beam as the default beam for aperiodic CSI-RS reduces beam management latency and overhead. Additionally, using an optimized shared beam as the default beam for aperiodic CSI-RS can improve downlink channel estimation (e.g., downlink CSI capture) and / or CSI-RS beam management procedures by enabling the UE 120 to use the optimized shared beam instead of the time-varying default beam to receive and / or measure aperiodic CSI-RS.

[0101] Figure 6 This is a diagram illustrating example 600 associated with the use of a shared beam as the default beam for aperiodic CSI-RS according to this disclosure. Figure 6 As shown, Example 600 includes communication between base station 110 and UE 120. In some aspects, base station 110 and UE 120 may be included in a wireless network (such as wireless network 100). Base station 110 and UE 120 may communicate via a wireless access link, which may include an uplink and a downlink.

[0102] As shown by reference numeral 605, base station 110 can transmit, and UE 120 can receive, configuration information. The configuration information can indicate whether UE 120 wants to use the default beam for aperiodic CSI-RS. For example, if the scheduling offset between the scheduling DCI and the transmission time of the aperiodic CSI-RS scheduled by the scheduling DCI is less than the UE's beam switching waiting time threshold, UE 120 can be configured by base station 110 to use the default beam, as described above. In some aspects, the configuration information can indicate one or more shared beams.

[0103] As indicated by reference numeral 610, UE 120 may determine (or identify) one or more shared beams. In some aspects, UE 120 may determine the shared beams at least in part based on implicit rules. For example, when the CORESET is configured in the active downlink bandwidth portion (BWP), the implicit rules may specify the shared beams to be identified at least in part based on the QCL assumption for receiving the CORESET with the lowest or highest identifier in the active downlink BWP. In another example, the implicit rules may identify the shared beams at least in part based on the QCL assumption of the activated PDSCH TCI state (e.g., with the highest or lowest identifier) ​​in the active DL BWP.

[0104] In some respects, UE 120 may determine (or identify) a shared beam at least in part based on explicit rules. Explicit rules may be based at least in part on one or more signals received by UE 120 from base station 110. For example, explicit rules may specify that a shared beam is identified at least in part based on downlink signaling (e.g., a single DCI or MAC-CE) that jointly updates (1) the downlink TCI state of one or more target downlink signals and (2) the uplink spatial relation identifier or uplink TCI state of one or more target uplink signals. In another example, explicit rules may specify that a shared beam is identified at least in part based on a single DCI that updates the TCI state of a semi-persistent or aperiodic reference signal resource (e.g., CSI-RS or SRS) resource used as the QCL source reference signal for both (1) the downlink TCI of one or more target downlink signals and (2) the uplink spatial relation or uplink TCI of one or more target uplink signals. In another example, explicit rules can specify the group of shared beams that are designated for uplink or downlink resources via downlink signaling (e.g., via RRC signaling, MAC-CE, or DCI). For example, RRC signaling can configure a resource group identifier for each uplink or downlink resource in the resource group or for a list of uplink and / or downlink resources in the group.

[0105] In some aspects, such as in multi-TRP communication scenarios, UE 120 may identify a single shared beam or multiple shared beams. Whether a shared beam is associated with a single shared beam or multiple shared beams can be determined by UE 120 based at least in part on rules or dynamic signaling received from base station 110 (e.g., in DCI, MAC-CE, or RRC signaling). In some aspects, when a shared beam is associated with a single beam, that shared beam can be selected as the shared beam for a specific TRP in a multi-TRP scenario. The beam can be determined by fixed rules. For example, the rules can specify that the shared beam is the beam with the lowest TRP index or CORESET pool index. In some cases, a single shared beam can be indicated via downlink signaling.

[0106] In some aspects, when a shared beam is associated with multiple shared beams, these multiple beams can be determined on a per-TRP basis. In a single-DCI-based multi-TRP scenario, the shared beam for the first TRP can be determined at least in part based on the first TCI state among the TCI code points with the lowest identifier among the TCI code points mapped to two TCI states, and the shared beam for the second TRP can be determined at least in part based on the second TCI state in that TCI code point. In a multi-DCI-based multi-TRP scenario, the shared beam for the TRP can be determined at least in part based on the QCL assumption, which assumes that the CORESET with the lowest or highest identifier among the CORESETs configured for the active downlink BWP and associated with the TRP (e.g., a CORESET with a corresponding CORESETPoolIndex).

[0107] As shown by reference numeral 615 in the attached figure, UE 120 can determine that a shared beam is to be used as the default beam for aperiodic CSI-RS, which is the default beam to be used by the UE if the scheduling offset between the scheduling DCI and the transmission time of the aperiodic CSI-RS scheduled by the scheduling DCI is less than the UE's beam switching waiting time threshold, as described above. UE 120 can determine that the shared beam is to be used as the default beam for aperiodic CSI-RS based at least in part on implicit rules or explicit indications.

[0108] For example, when a shared beam is determined (or identified) using implicit rules, as described above, UE 120 may determine, at least in part, that the shared beam should be used as the default beam for aperiodic CSI-RS based on implicit rules specifying that the shared beam can be used as the default CSI-RS beam when it is selected. For example, the implicit rule may indicate that if the shared beam is selected or identified using implicit rules, then the shared beam will always be used by UE 120 as the default beam for aperiodic CSI-RS. In some aspects, when a shared beam is determined (or identified) using implicit rules, UE 120 may determine, at least in part, that the shared beam should be used as the default beam for aperiodic CSI-RS based on an indication received from base station 110. For example, base station 110 may transmit an indication to UE 120 via downlink signaling that the shared beam should be used as the default beam. The downlink signaling may include DCI, MAC-CE signaling, or RRC signaling. For example, base station 110 may indicate in a flag carried by the RRC signal that the shared beam is to be used as the default beam for aperiodic CSI-RS.

[0109] In some aspects, when a shared beam is determined (or identified) using explicit rules, as described above, UE 120 may determine, at least in part, that the shared beam should be used as the default beam for aperiodic CSI-RS based on implicit rules specifying that the shared beam can be used as the default CSI-RS beam when determined using explicit rules. For example, the implicit rule may indicate that if the shared beam is selected or identified using explicit rules, then the shared beam should always be used by UE 120 as the default beam for aperiodic CSI-RS. In some aspects, when a shared beam is determined (or identified) using explicit rules, UE 120 may determine, at least in part, that the shared beam should be used as the default beam for aperiodic CSI-RS based on an indication received from base station 110. For example, base station 110 may transmit an indication to UE 120 via downlink signaling that the shared beam should be used as the default beam. Downlink signaling may include DCI, MAC-CE signaling, or RRC signaling. For example, base station 110 may indicate in a flag carried by the RRC signal that a shared beam should be used as the default beam for aperiodic CSI-RS. As described above, explicit rules may be associated with signals transmitted by base station 110 (e.g., signals used to identify or update the shared beam). In some aspects, base station 110 may identify or update the shared beam in the same signal and indicate that the shared beam should be used as the default beam for aperiodic CSI-RS to save resources.

[0110] In a multi-TRP communication scenario, the indication that a shared beam for one TRP should be used as the default beam for the aperiodic CSI-RS of the same TRP can be implicitly or explicitly determined by the UE 120, as described above.

[0111] As shown by reference numeral 620, base station 110 can transmit, and UE 120 can receive, a DCI for scheduling aperiodic CSI-RS. The DCI may indicate the beam to be used by UE 120 to receive aperiodic CSI-RS and / or the transmission time of the aperiodic CSI-RS. As shown by reference numeral 625, UE 120 may determine that a default beam should be used to receive the aperiodic CSI-RS scheduled by the scheduling DCI. For example, UE 120 may determine that the scheduling offset between the transmission time of the scheduling DCI and the aperiodic CSI-RS is less than a beam switching wait time threshold for UE 120. Therefore, UE 120 may determine that a default beam (e.g., not the beam indicated by the scheduling DCI) should be used to receive the aperiodic CSI-RS. In some aspects, if the transmission time of the scheduling DCI and the aperiodic CSI-RS is equal to or greater than the beam switching wait time threshold for UE 120, UE 120 may determine that the beam indicated by the scheduling DCI should be used to receive the aperiodic CSI-RS.

[0112] As shown by reference numeral 630, base station 110 can transmit aperiodic CSI-RS as scheduled by the DCI. As shown by reference numeral 635, UE 120 can use a shared beam as the default beam to receive aperiodic CSI-RS, as described above.

[0113] In some aspects, base station 110 may indicate that a selected or identified shared beam should not be used as the default beam for aperiodic CSI-RS. For example, base station 110 may indicate that a shared beam determined by UE 120, at least in part, based on implicit rules, should not be used as the default beam for aperiodic CSI-RS. Similarly, base station 110 may indicate that a shared beam determined by UE 120, at least in part, based on explicit rules, should not be used as the default beam for aperiodic CSI-RS. In some aspects, base station 110 may update the shared beam or indicate a new shared beam. Base station 110 may indicate that the updated shared beam or the new shared beam should not be used as the default beam for aperiodic CSI-RS.

[0114] When base station 110 indicates that a shared beam should not be used as the default beam for aperiodic CSI-RS, UE 120 may determine the default beam for aperiodic CSI-RS based at least in part on the QCL assumption of the lowest identifier of the CORESET in the most recently monitored time slot in the active downlink BWP. In some aspects, when base station 110 indicates that a new or updated shared beam should not be used as the default beam for aperiodic CSI-RS, UE 120 may determine the default beam for aperiodic CSI-RS based at least in part on the last applicable shared beam (e.g., the shared beam determined or identified before the new or updated shared beam). For example, UE 120 may determine that the last applicable shared beam (e.g., before the new or updated shared beam) should be used as the default beam for aperiodic CSI-RS.

[0115] As a result, UE 120 can use an optimized shared beam as the default beam for aperiodic CSI-RS, thereby improving communication efficiency. Since the shared beam remains constant over time (and is optimized, as described above), using it as the default beam for aperiodic CSI-RS when the default beam is used results in improved communication performance and reliability. Furthermore, using the shared beam as the default beam for aperiodic CSI-RS reduces beam management latency and overhead. Additionally, using the optimized shared beam as the default beam for aperiodic CSI-RS improves downlink channel estimation (e.g., downlink CSI capture) and / or CSI-RS beam management procedures by enabling UE 120 to use the optimized shared beam instead of the time-varying default beam to receive and / or measure aperiodic CSI-RS.

[0116] As indicated above, Figure 6 This is provided as an example. Other examples may differ from the one provided. Figure 6 The example described.

[0117] Figure 7 This is a diagram illustrating an example procedure 700 performed by a UE according to this disclosure. Example procedure 700 is an example in which a UE (e.g., UE 120) performs operations associated with using a shared beam as the default beam for aperiodic CSI-RS.

[0118] like Figure 7 As shown, in some aspects, process 700 may include identifying the TCI state associated with at least two signals or at least two communication channels (block 710). For example, the UE (e.g., using...) Figure 9The TCI status identification component 908 described herein can identify the TCI status associated with at least two signals or at least two communication channels, as described above.

[0119] like Figure 7 As further illustrated, in some aspects, process 700 may optionally include determining, at least in part, based on the scheduling offset between the scheduling DCI of the scheduling aperiodic CSI-RS and the transmission time of the aperiodic CSI-RS being less than a beam switching wait time threshold, that the TCI state should be used as the default beam for the aperiodic CSI-RS (box 720). For example, the UE (e.g., using...) Figure 9 The default beam determination component 910 described herein can determine, at least in part, that the TCI state should be used as the default beam for the aperiodic CSI-RS based on the scheduling offset between the scheduling DCI of the scheduling aperiodic CSI-RS and the transmission time of the aperiodic CSI-RS being less than a beam switching wait time threshold, as described above.

[0120] like Figure 7 As further illustrated, in some aspects, process 700 may include using the TCI state as the default beam for receiving the aperiodic CSI-RS (box 730), at least in part based on the scheduling offset between the scheduling DCI of the scheduling aperiodic CSI-RS and the transmission time of the aperiodic CSI-RS being less than a beam switching wait time threshold. For example, the UE (e.g., using...) Figure 9 The receiving component 902 described herein may, at least in part, use the TCI state as the default beam for receiving the aperiodic CSI-RS based on the scheduling offset between the scheduling DCI of the scheduling aperiodic CSI-RS and the transmission time of the aperiodic CSI-RS being less than a beam switching wait time threshold, as described above.

[0121] Process 700 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.

[0122] In the first aspect, identifying the TCI state associated with at least two signals or at least two communication channels includes identifying the TCI state based at least in part on implicit rules.

[0123] In the second aspect, either alone or in combination with the first aspect, determining that the TCI state should be used as the default beam for aperiodic CSI-RS includes: determining that the TCI state should always be used as the default beam by the UE if the scheduling offset between the scheduling DCI and the transmission time of the aperiodic CSI-RS scheduled by the scheduling DCI is less than a beam switching waiting time threshold.

[0124] In the third aspect, determining, either alone or in combination with the first aspect, that the TCI state should be used as the default beam for aperiodic CSI-RS includes receiving an indication from the base station that the TCI state should be used as the default beam for aperiodic CSI-RS.

[0125] In the fourth aspect, receiving an indication, either alone or in combination with the first or second aspect, regarding the TCI state to be used as the default beam for aperiodic CSI-RS includes receiving the indication via DCI communication.

[0126] In the fifth aspect, receiving an indication, either alone or in combination with the first or second aspect, regarding the TCI state to be used as the default beam for the aperiodic CSI-RS includes receiving the indication via MAC-CE communication.

[0127] In the sixth aspect, receiving an indication, either alone or in combination with the first or second aspect, regarding the TCI state to be used as the default beam for the aperiodic CSI-RS includes receiving the indication via RRC communication.

[0128] In the seventh aspect, determining the TCI state associated with at least two signal or communication channels, either alone or in combination with one or more of the first to sixth aspects, includes determining the TCI state based at least in part on explicit rules.

[0129] In the eighth aspect, determining that the TCI state should be used as the default beam for aperiodic CSI-RS includes receiving an indication from the base station that the TCI state should be used as the default beam for aperiodic CSI-RS.

[0130] In the ninth aspect, alone or in combination with the eighth aspect, receiving an indication regarding the TCI state to be used as the default beam for aperiodic CSI-RS includes receiving the indication via DCI communication.

[0131] In the tenth aspect, alone or in combination with the eighth aspect, receiving an indication regarding the TCI state to be used as the default beam for aperiodic CSI-RS includes receiving the indication via MAC-CE communication.

[0132] In the eleventh aspect, receiving an indication, either alone or in conjunction with the eighth aspect, regarding the TCI state to be used as the default beam for aperiodic CSI-RS includes receiving the indication via RRC communication.

[0133] In the twelfth aspect, receiving an indication that the TCI state is to be used as the default beam for aperiodic CSI-RS, either alone or in combination with one or more of the eighth to eleventh aspects, includes receiving an indication of the TCI state and an indication that the TCI state is to be used as the default beam for aperiodic CSI-RS in the same signal.

[0134] In the thirteenth aspect, determining the TCI state associated with at least two signal or communication channels, either alone or in combination with one or more of the first to twelfth aspects, includes: determining the TCI state to be used for the multi-TRP configuration.

[0135] In the fourteenth aspect, either alone or in combination with one or more of the first to thirteenth aspects, the TCI state to be used for a multi-TRP configuration is associated with a single beam or multiple beams.

[0136] In the fifteenth aspect, determining the TCI state to be used as the default beam for aperiodic CSI-RS, either alone or in combination with one or more of the first to fourteenth aspects, includes: determining the TCI state associated with a TRP in a multi-TRP configuration to be used as the default beam for aperiodic CSI-RS associated with that TRP.

[0137] In the sixteenth aspect, alone or in combination with one or more of the first to fifteenth aspects, process 700 includes receiving from the base station an indication that the TCI state should not be used as the default beam for aperiodic CSI-RS.

[0138] In the seventeenth aspect, alone or in combination with one or more of the first to sixteenth aspects, the UE 700 includes determining another default beam for aperiodic CSI-RS based at least in part on a quasi-co-location assumption of the control resource set having the lowest identifier in the most recently monitored time slot in the active downlink bandwidth portion.

[0139] In the eighteenth aspect, alone or in combination with one or more of the first to seventeenth aspects, process 700 includes determining another TCI state determined prior to determining the TCI state to be used as a new default beam for aperiodic CSI-RS.

[0140] although Figure 7 An example box of process 700 is shown, but in some respects, process 700 may include... Figure 7 The boxes depicted in the process are compared to additional boxes, fewer boxes, different boxes, or boxes arranged differently. Additionally or alternatively, two or more boxes in process 700 can be executed in parallel.

[0141] Figure 8This is a diagram illustrating an example process 800 performed by a base station according to this disclosure. Example process 800 is an example in which a base station (e.g., base station 110) performs operations associated with using a shared beam as the default beam for aperiodic CSI-RS.

[0142] like Figure 8 As shown, in some aspects, process 800 may include transmitting to the UE an indication regarding the TCI states associated with at least two signals or at least two communication channels to be used as the default beam for aperiodic CSI-RS (box 810). For example, a base station (e.g., using...) Figure 10 The transmission component 1004 described herein can transmit to the UE an indication of the TCI state associated with at least two signals or at least two communication channels to be used as the default beam for aperiodic CSI-RS, as described above.

[0143] like Figure 8 As further illustrated, in some aspects, process 800 may include transmitting to the UE an aperiodic CSI-RS (block 820) to be received by the UE using the TCI state as the default beam. For example, the base station (e.g., using...) Figure 10 The transmission component 1004 described herein can transmit to the UE an aperiodic CSI-RS to be received by the UE using the TCI state as the default beam, as described above.

[0144] Process 800 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.

[0145] In a first aspect, process 800 includes transmitting a configuration to the UE indicating that if the scheduling offset between the scheduling DCI and the transmission time of the aperiodic CSI-RS scheduled by the scheduling DCI is less than a beam switching waiting time threshold, the UE will use the default beam for the aperiodic CSI-RS.

[0146] In the second aspect, either alone or in combination with the first aspect, the TCI state is determined by the UE based at least in part on implicit indications.

[0147] In the third aspect, either alone or in combination with one or more of the first and second aspects, transmitting an indication regarding the TCI state to be used as the default beam for aperiodic CSI-RS includes transmitting the indication via DCI communication.

[0148] In the fourth aspect, either alone or in combination with one or more of the first and second aspects, transmitting an indication regarding the TCI state to be used as the default beam for aperiodic CSI-RS includes transmitting the indication via MAC-CE communication.

[0149] In the fifth aspect, either alone or in combination with one or more of the first and second aspects, transmitting an indication regarding the TCI state to be used as the default beam for the aperiodic CSI-RS includes transmitting the indication via RRC communication.

[0150] In the sixth aspect, either alone or in combination with the first aspect, process 800 includes transmitting an indication of the TCI status to the UE.

[0151] In the seventh aspect, either alone or in combination with one or more of the first or sixth aspects, transmitting an indication regarding the TCI state to be used as the default beam for aperiodic CSI-RS includes transmitting the indication via DCI communication.

[0152] In the eighth aspect, either alone or in combination with one or more of the first or sixth aspects, transmitting an indication that the TCI state is to be used as the default beam for the aperiodic CSI-RS includes transmitting the indication via MAC-CE communication.

[0153] In the ninth aspect, the transmission of an indication regarding the TCI state to be used as the default beam for the aperiodic CSI-RS, either alone or in combination with one or more of the first or sixth aspects, includes transmitting the indication via RRC communication.

[0154] In the tenth aspect, transmitting an indication that the TCI state is to be used as the default beam for aperiodic CSI-RS, either alone or in combination with one or more of the first or sixth to ninth aspects, includes transmitting an indication of the TCI state and an indication that the TCI state is to be used as the default beam for aperiodic CSI-RS in the same signal.

[0155] In the eleventh aspect, alone or in combination with one or more of the first to tenth aspects, process 800 includes determining the TCI state to be used in the multi-TRP configuration.

[0156] In the twelfth aspect, the TCI state to be used for a multi-TRP configuration is associated with a single beam or multiple beams, either alone or in combination with one or more of the first to eleventh aspects.

[0157] In the thirteenth aspect, transmitting an indication, either alone or in combination with one or more of the first to twelfth aspects, regarding the TCI state to be used as the default beam for aperiodic CSI-RS includes: transmitting to the UE an indication regarding the TCI state associated with a TRP in a multi-TRP configuration to be used as the default beam for aperiodic CSI-RS associated with that TRP.

[0158] In the fourteenth aspect, alone or in combination with one or more of the first to thirteenth aspects, process 800 includes transmitting to the UE an indication that the TCI state is no longer to be used as the default beam.

[0159] In the fifteenth aspect, alone or in combination with one or more of the first to fourteenth aspects, process 800 includes determining a TCI state associated with at least two signal or communication channels.

[0160] although Figure 8 An example box of process 800 is shown, but in some respects, process 800 may include... Figure 8 The boxes depicted in the diagram are compared to additional boxes, fewer boxes, different boxes, or boxes arranged differently. Additionally or alternatively, two or more boxes in process 800 can be executed in parallel.

[0161] Figure 9 This is a block diagram of an example device 900 for wireless communication. Device 900 may be a UE, or a UE may include device 900. In some aspects, device 900 includes a receiving component 902 and a transmitting component 904, which may communicate with each other (e.g., via one or more buses and / or one or more other components). As shown, device 900 may use the receiving component 902 and the transmitting component 904 to communicate with another device 906 (such as a UE, a base station, or another wireless communication device). As further shown, device 900 may include one or more of the following: a TCI status identification component 908 or a default beam determination component 910.

[0162] In some respects, device 900 can be configured to perform the functions described herein. Figure 6 The described one or more operations. Additionally or alternatively, the device 900 may be configured to perform one or more processes described herein (such as...). Figure 7 The process 700) or a combination thereof. In some aspects, the device 900 and / or Figure 9 One or more components shown may include the above combination Figure 2 One or more components of the described UE. Additionally or alternatively, Figure 9 One or more components shown can be combined as described above. Figure 2Implemented within one or more of the described components. Additionally or alternatively, one or more components in the set of components may be implemented at least partially as software stored in memory. For example, a component (or a portion of a component) may be implemented as instructions or code stored in a non-transitory computer-readable medium and may be executed by a controller or processor to perform the function or operation of that component.

[0163] Receiver 902 may receive communications (such as reference signals, control information, data communications, or combinations thereof) from device 906. Receiver 902 may provide the received communications to one or more other components of device 900. In some aspects, receiver 902 may perform signal processing on the received communications (such as filtering, amplification, demodulation, analog-to-digital conversion, demultiplexing, deinterleaving, demapping, equalization, interference cancellation, or decoding, etc.), and may provide the processed signal to one or more other components of device 906. In some aspects, receiver 902 may include combinations of the above. Figure 2 The described UE includes one or more antennas, demodulators, MIMO detectors, receiver processors, controllers / processors, memory, or combinations thereof.

[0164] The transmission component 904 can transmit communications (such as reference signals, control information, data communications, or combinations thereof) to the device 906. In some aspects, one or more other components of the device 906 can generate communications and provide the generated communications to the transmission component 904 for transmission to the device 906. In some aspects, the transmission component 904 can perform signal processing (such as filtering, amplification, modulation, digital-to-analog conversion, multiplexing, interleaving, mapping, encoding, etc.) on the generated communications and can transmit the processed signals to the device 906. In some aspects, the transmission component 904 can include combinations of the above. Figure 2 The described UE includes one or more antennas, modulators, transmit MIMO processors, transmit processors, controllers / processors, memories, or combinations thereof. In some aspects, the transmit component 904 may coexist with the receive component 902 in a transceiver.

[0165] TCI status identification component 908 can identify the TCI status associated with at least two signals or at least two communication channels. TCI status identification component 908 may include the above combinations. Figure 2 The described UE's controller / processor and / or memory 282. The default beam determination component 910 can determine the TCI state to be used as the default beam for aperiodic CSI-RS, wherein the default beam will be used by the UE if the scheduling offset between the scheduling DCI and the transmission time of the aperiodic CSI-RS scheduled by the scheduling DCI is less than a beam switching wait time threshold. Figure 2The described UE's controller / processor and / or memory 282. The receiving component 902 may use the TCI state as the default beam to receive the aperiodic CSI-RS, at least in part, based on the scheduling offset between the scheduling DCI of the scheduling aperiodic CSI-RS and the transmission time of the aperiodic CSI-RS being less than a beam switching wait time threshold.

[0166] The receiving component 902 can receive from the base station an indication that the TCI status should not be used as the default beam for aperiodic CSI-RS.

[0167] The default beam determination component 910 can determine another default beam for aperiodic CSI-RS based at least in part on the quasi-co-location assumption of the control resource set with the lowest identifier in the latest monitored time slot in the active downlink bandwidth portion.

[0168] The default beam determination component 910 can determine another TCI state determined before this TCI state is determined to be used as the new default beam for aperiodic CSI-RS.

[0169] Figure 9 The number and arrangement of components shown are provided as an example. In practice, different arrangements may exist. Figure 9 The components shown are compared to additional components, fewer components, different components, or components arranged differently. Furthermore, Figure 9 The two or more components shown can be implemented within a single component, or Figure 9 The single component shown can be implemented as multiple distributed components. Additionally or alternatively, Figure 9 The collection of components shown (e.g., one or more components) can be executed as described by Figure 9 The other set of components shown in the diagram performs one or more functions.

[0170] Figure 10 This is a block diagram of an example device 1000 for wireless communication. Device 1000 may be a base station, or a base station may include device 1000. In some aspects, device 1000 includes a receiving component 1002 and a transmitting component 1004, which may be in communication with each other (e.g., via one or more buses and / or one or more other components). As shown, device 1000 may use the receiving component 1002 and the transmitting component 1004 to communicate with another device 1006 (such as a UE, a base station, or another wireless communication device). As further shown, device 1000 may include a determining component 1008 and other examples.

[0171] In some respects, device 1000 can be configured to perform the functions described herein. Figure 6One or more operations as described herein. Additionally or alternatively, the apparatus 1000 may be configured to perform one or more processes described herein (such as...). Figure 8 The process 800) or a combination thereof. In some aspects, the device 1000 and / or Figure 10 One or more components shown may include the above combination Figure 2 One or more components of the described base station. Additional or alternative. Figure 10 One or more components shown can be combined as described above. Figure 2 Implemented within one or more of the described components. Additionally or alternatively, one or more components in the set of components may be implemented at least partially as software stored in memory. For example, a component (or a portion of a component) may be implemented as instructions or code stored in a non-transitory computer-readable medium and may be executed by a controller or processor to perform the function or operation of that component.

[0172] Receiver 1002 may receive communications (such as reference signals, control information, data communications, or combinations thereof) from device 1006. Receiver 1002 may provide the received communications to one or more other components of device 1000. In some aspects, receiver 1002 may perform signal processing on the received communications (such as filtering, amplification, demodulation, analog-to-digital conversion, demultiplexing, deinterleaving, demapping, equalization, interference cancellation, or decoding, etc.), and may provide the processed signal to one or more other components of device 1006. In some aspects, receiver 1002 may include combinations of the above. Figure 2 The described base station includes one or more antennas, demodulators, MIMO detectors, receiver processors, controllers / processors, memory, or combinations thereof.

[0173] The transmission component 1004 can transmit communications (such as reference signals, control information, data communications, or combinations thereof) to the device 1006. In some aspects, one or more other components of the device 1006 can generate communications and provide the generated communications to the transmission component 1004 for transmission to the device 1006. In some aspects, the transmission component 1004 can perform signal processing (such as filtering, amplification, modulation, digital-to-analog conversion, multiplexing, interleaving, mapping, encoding, etc.) on the generated communications and can transmit the processed signals to the device 1006. In some aspects, the transmission component 1004 may include combinations of the above. Figure 2 The described base station includes one or more antennas, modulators, transmit MIMO processors, transmit processors, controllers / processors, memory, or combinations thereof. In some aspects, the transmit component 1004 may coexist with the receive component 1002 in a transceiver.

[0174] The transmission component 1004 can transmit to the UE an indication of the TCI state associated with at least two signal or communication channels to be used as the default beam for aperiodic CSI-RS, wherein the default beam will be used by the UE if the scheduling offset between the scheduling DCI and the transmission time of the aperiodic CSI-RS scheduled by the scheduling DCI is less than a beam switching wait time threshold associated with the UE. The transmission component 1004 can also transmit to the UE the aperiodic CSI-RS to be received by the UE using the TCI state as the default beam.

[0175] The transmission component 1004 can transmit a configuration to the UE indicating that if the scheduling offset between the scheduling DCI and the transmission time of the aperiodic CSI-RS scheduled by the scheduling DCI is less than a beam switching waiting time threshold, the UE will use the default beam for the aperiodic CSI-RS.

[0176] The transmission component 1004 can transmit an indication of the TCI status to the UE.

[0177] Component 1008 determines the TCI state to be used in a multi-TRP configuration. Component 1008 may include the above combinations. Figure 2 The described base station's controller / processor and / or memory 242.

[0178] The transmission component 1004 can transmit to the UE an indication that the TCI state is no longer to be used as the default beam.

[0179] The determining component 1008 can determine the TCI state associated with at least two signal or communication channels.

[0180] Figure 10 The number and arrangement of components shown are provided as an example. In practice, different arrangements may exist. Figure 10 The components shown are compared to additional components, fewer components, different components, or components arranged differently. Furthermore, Figure 10 The two or more components shown can be implemented within a single component, or Figure 10 The single component shown can be implemented as multiple distributed components. Additionally or alternatively, Figure 10 The collection of components shown (e.g., one or more components) can be executed as described by Figure 10 The other set of components shown in the diagram performs one or more functions.

[0181] The following provides an overview of some aspects of this disclosure:

[0182] Aspect 1: A method for wireless communication performed by a user equipment (UE), comprising: identifying a transmission configuration indicator (TCI) state associated with at least two signals or at least two communication channels; and using the TCI state as a default beam for receiving the aperiodic CSI-RS, based at least in part on a scheduling offset between scheduling downlink control information (DCI) of a scheduling aperiodic channel state information reference signal (CSI-RS) and the transmission time of the aperiodic CSI-RS being less than a beam switching wait time threshold.

[0183] Aspect 2: The method of aspect 1, wherein using the TCI state as the default beam is based at least in part on always using the TCI state as the default beam.

[0184] Aspect 3: The method of any of Aspects 1-2, wherein identifying the TCI state associated with at least two signals or at least two communication channels includes: identifying the TCI state at least in part based on implicit rules.

[0185] Aspect 4: The method of aspect 3 further includes: receiving from the base station an indication that the TCI state is to be used as the default beam for aperiodic CSI-RS.

[0186] Aspect 5: The method of aspect 4, wherein receiving an indication that the TCI state is to be used as the default beam for aperiodic CSI-RS includes receiving the indication via DCI communication.

[0187] Aspect 6: The method of aspect 4, wherein receiving an indication that the TCI state is to be used as the default beam for aperiodic CSI-RS includes receiving the indication via Media Access Control (MAC) Control Element (MAC-CE) communication.

[0188] Aspect 7: The method of aspect 4, wherein receiving an indication that the TCI state is to be used as the default beam for aperiodic CSI-RS includes receiving the indication via radio resource control (RRC) communication.

[0189] Aspect 8: The method of any of Aspects 1-7, wherein identifying the TCI state associated with at least two signals or at least two communication channels includes: identifying the TCI state based at least in part on explicit rules.

[0190] Aspect 9: The method of aspect 8 further includes: receiving from the base station an indication that the TCI state is to be used as the default beam for aperiodic CSI-RS.

[0191] Aspect 10: The method of aspect 9, wherein receiving an indication that the TCI state is to be used as the default beam for aperiodic CSI-RS includes receiving the indication via DCI communication.

[0192] Aspect 11: The method of aspect 9, wherein receiving an indication that the TCI state is to be used as the default beam for aperiodic CSI-RS includes receiving the indication via Media Access Control (MAC) Control Element (MAC-CE) communication.

[0193] Aspect 12: The method of aspect 9, wherein receiving an indication that the TCI state is to be used as the default beam for aperiodic CSI-RS includes receiving the indication via radio resource control (RRC) communication.

[0194] Aspect 13: The method of any of Aspects 9-12, wherein receiving an indication of the TCI state to be used as the default beam for aperiodic CSI-RS comprises: receiving the indication of the TCI state and the indication of the TCI state to be used as the default beam for aperiodic CSI-RS in the same signal.

[0195] Aspect 14: The method of any of Aspects 1-13, wherein identifying the TCI state associated with at least two signals or at least two communication channels includes: identifying that the TCI state is to be used in a multiple transmit receiver point (multiple TRP) configuration.

[0196] Aspect 15: The method of aspect 14, wherein the TCI state to be used for multi-TRP configuration is associated with a single beam or multiple beams.

[0197] Aspect 16: The method of any of Aspects 14-15, wherein the TCI state associated with a TRP in a multi-TRP configuration is to be used as the default beam for the aperiodic CSI-RS associated with that TRP.

[0198] Aspect 17: The method of any of Aspects 1-16 further includes: receiving from the base station an indication that the TCI state should not be used as the default beam for aperiodic CSI-RS.

[0199] Aspect 18: The method of aspect 17 further includes: determining another default beam for aperiodic CSI-RS based at least in part on a quasi-co-location assumption of the control resource set having the lowest identifier in the most recently monitored time slot in the active downlink bandwidth portion.

[0200] Aspect 19: The method of any of Aspects 17-18 further includes: determining another TCI state determined before identifying the TCI state to be used as a new default beam for the aperiodic CSI-RS.

[0201] Aspect 20: The method of any of Aspects 1-19 further includes: receiving a scheduling DCI for a periodic CSI-RS, wherein the DCI indicates the transmission time of the periodic CSI-RS; and determining that the scheduling offset between the scheduling DCI and the transmission time of the periodic CSI-RS is less than a beam switching wait time threshold.

[0202] Aspect 21: A method of wireless communication performed by a base station, comprising: transmitting to a user equipment (UE) an indication that a Transmission Configuration Indicator (TCI) state associated with at least two signals or at least two communication channels is to be used as a default beam for an aperiodic Channel State Information Reference Signal (CSI-RS); and transmitting to the UE an aperiodic CSI-RS to be received by the UE using the TCI state as the default beam.

[0203] Aspect 22: The method of aspect 20 further includes: transmitting a configuration to the UE indicating that if the scheduling offset between the scheduling DCI and the transmission time of the aperiodic CSI-RS scheduled by the scheduling DCI is less than a beam switching waiting time threshold, the UE will use the default beam for the aperiodic CSI-RS.

[0204] Aspect 23: The method of any of Aspects 20-21, wherein the TCI state is identified by the UE at least in part based on an implicit indication.

[0205] Aspect 24: The method of aspect 22, wherein transmitting an indication that the TCI state is to be used as the default beam for aperiodic CSI-RS includes transmitting the indication via DCI communication.

[0206] Aspect 25: The method of aspect 22, wherein transmitting an indication that the TCI state is to be used as the default beam for aperiodic CSI-RS comprises transmitting the indication via Media Access Control (MAC) Control Element (MAC-CE) communication.

[0207] Aspect 26: The method of aspect 22, wherein transmitting an indication that the TCI state is to be used as the default beam for aperiodic CSI-RS includes transmitting the indication via radio resource control (RRC) communication.

[0208] Aspect 27: The method of any of Aspects 20-25 further includes: transmitting an indication of the TCI state to the UE.

[0209] Aspect 28: The method of aspect 26, wherein transmitting an indication that the TCI state is to be used as the default beam for aperiodic CSI-RS includes transmitting the indication via DCI communication.

[0210] Aspect 29: The method of aspect 26, wherein transmitting an indication that the TCI state is to be used as the default beam for aperiodic CSI-RS includes transmitting the indication via Media Access Control (MAC) Control Element (MAC-CE) communication.

[0211] Aspect 30: The method of aspect 26, wherein transmitting an indication that the TCI state is to be used as the default beam for aperiodic CSI-RS includes transmitting the indication via radio resource control (RRC) communication.

[0212] Aspect 31: The method of any of Aspects 26-29, wherein transmitting an indication that the TCI state is to be used as the default beam for aperiodic CSI-RS comprises transmitting, in the same signal, an indication of the TCI state and an indication that the TCI state is to be used as the default beam for aperiodic CSI-RS.

[0213] Aspect 32: The method of any of Aspects 20-30 further includes: determining that the TCI state is to be used for a multiple transmit receiver point (multiple TRP) configuration.

[0214] Aspect 33: The method of aspect 31, wherein the TCI state to be used for multi-TRP configuration is associated with a single beam or multiple beams.

[0215] Aspect 34: The method of any of Aspects 31-32, wherein transmitting an indication that the TCI state is to be used as the default beam for the aperiodic CSI-RS comprises: transmitting to the UE an indication that the TCI state associated with a TRP in a multi-TRP configuration is to be used as the default beam for the aperiodic CSI-RS associated with that TRP.

[0216] Aspect 35: The method of any of Aspects 20-33 further includes: transmitting to the UE an indication that the TCI state is no longer to be used as the default beam.

[0217] Aspect 36: The method of any of Aspects 20-34 further includes: determining the TCI state associated with at least two signal or communication channels.

[0218] Aspect 37: An apparatus for wireless communication at a device, comprising: a processor; a memory coupled to the processor; and instructions stored in the memory and executable by the processor to cause the apparatus to perform methods as described in one or more of aspects 1-20.

[0219] Aspect 38: An apparatus for wireless communication, comprising a memory and one or more processors coupled to the memory, the one or more processors being configured to perform methods as described in one or more aspects of aspects 1-20.

[0220] Aspect 39: An apparatus for wireless communication, comprising at least one means for performing a method as described in one or more aspects of aspects 1-20.

[0221] Aspect 40: A non-transient computer-readable medium storing code for wireless communication, the code including instructions executable by a processor to perform methods as described in one or more aspects of aspects 1-20.

[0222] Aspect 41: A non-transient computer-readable medium storing a set of instructions for wireless communication, the set of instructions including one or more instructions which, when executed by one or more processors of a device, cause the device to perform methods as described in one or more aspects of aspects 1-20.

[0223] Aspect 42: An apparatus for wireless communication at a device, comprising: a processor; a memory coupled to the processor; and instructions stored in the memory and executable by the processor to cause the apparatus to perform methods as described in one or more aspects of aspects 21-36.

[0224] Aspect 43: An apparatus for wireless communication, comprising a memory and one or more processors coupled to the memory, the one or more processors being configured to perform methods as described in one or more aspects of aspects 21-36.

[0225] Aspect 44: An apparatus for wireless communication, comprising at least one means for performing a method as described in one or more aspects of aspects 21-36.

[0226] Aspect 45: A non-transient computer-readable medium storing code for wireless communication, the code including instructions executable by a processor to perform methods as described in one or more aspects of aspects 21-36.

[0227] Aspect 46: A non-transient computer-readable medium storing a set of instructions for wireless communication, the set of instructions including one or more instructions which, when executed by one or more processors of a device, cause the device to perform methods as described in one or more aspects of aspects 21-36.

[0228] The foregoing disclosure provides explanations and descriptions, but is not intended to be exhaustive or to limit the aspects to the precise forms disclosed. Modifications and variations may be made in light of the foregoing disclosure or may be obtained through practice.

[0229] As used herein, the term "component" is intended to be broadly interpreted as hardware and / or a combination of hardware and software. "Software" should be broadly interpreted as instructions, instruction sets, code, code segments, program code, programs, subroutines, software modules, applications, software applications, software packages, routines, subroutines, objects, executables, threads of execution, procedures, and / or functions, whether referred to as software, firmware, middleware, microcode, hardware description languages, or other terms. As used herein, processors are implemented using hardware and / or a combination of hardware and software. It will be apparent that the systems and / or methods described herein can be implemented in various forms of hardware and / or combinations of hardware and software. The actual dedicated control hardware or software code used to implement these systems and / or methods is not limited in any way. Thus, the operation and behavior of these systems and / or methods are described herein without reference to any specific software code—it is understood that software and hardware can be designed to implement these systems and / or methods, at least in part, based on the descriptions herein.

[0230] As used in this article, depending on the context, a threshold can refer to a value greater than the threshold, greater than or equal to the threshold, less than the threshold, less than or equal to the threshold, equal to the threshold, not equal to the threshold, etc.

[0231] Although specific combinations of features are described in the claims and / or disclosed in the specification, these combinations are not intended to limit the disclosure of aspects. In fact, many of these features can be combined in ways not specifically described in the claims and / or not disclosed in the specification. Although each dependent claim listed below may be directly subordinated to only one claim, the disclosure of aspects includes each dependent claim being combined with each other claim in this set of claims. As used herein, the phrase “at least one of” refers to any combination of these items, including single members. As an example, “at least one of a, b, or c” is intended to cover: a, b, c, ab, ac, bc, and abc, as well as any combination having multiple identical elements (e.g., aa, aaa, aab, aac, abb, acc, bb, bbb, bbc, cc, and ccc, or any other ordering of a, b, and c).

[0232] The elements, actions, or instructions used herein should not be construed as critical or necessary unless explicitly stated otherwise. Furthermore, as used herein, the articles “a” and “a certain” are intended to include one or more items and may be used interchangeably with “one or more.” Additionally, as used herein, the article “the” is intended to include one or more items referenced in conjunction with the article “the” and may be used interchangeably with “one or more.” Furthermore, as used herein, the terms “set” and “group” are intended to include one or more items (e.g., related items, unrelated items, or a combination of related and unrelated items) and may be used interchangeably with “one or more.” Where only one item is intended, the phrase “only one” or similar language is used. Moreover, as used herein, the terms “have,” “contain,” “include,” etc., are intended to be open-ended terms. Additionally, the phrase “based on” is intended to mean “at least partially based on” unless otherwise explicitly stated. Moreover, as used herein, the term “or” is intended to be inclusive when used in a sequence and may be used interchangeably with “and / or” unless otherwise explicitly stated (e.g., in combination with “either of” or “only one of”).

Claims

1. A method for wireless communication performed by a user equipment (UE), comprising: Identify the Transmission Configuration Indicator (TCI) state associated with at least two signals or at least two communication channels, wherein the same TCI state is used when receiving using the at least two signals or at least two communication channels; and The TCI state is used as the default beam for receiving the aperiodic CSI-RS, based at least in part on the fact that the scheduling offset between the scheduling downlink control information (DCI) of the scheduling aperiodic channel state information reference signal (CSI-RS) and the transmission time of the aperiodic CSI-RS is less than a beam switching wait time threshold.

2. The method of claim 1, wherein using the TCI state as the default beam is at least in part based on always using the TCI state as the default beam.

3. The method of claim 1, wherein identifying the TCI state associated with at least two signals or at least two communication channels comprises: The TCI state is identified at least in part based on implicit rules.

4. The method of claim 3, further comprising: Receive an indication from the network entity that the TCI state should be used as the default beam for aperiodic CSI-RS.

5. The method of claim 4, wherein receiving an indication regarding the TCI state to be used as the default beam for aperiodic CSI-RS comprises: The instruction is received via at least one of DCI communication, Media Access Control (MAC) Control Element (MAC-CE) communication, or Radio Resource Control (RRC) communication.

6. The method of claim 1, wherein identifying the TCI state associated with at least two signals or at least two communication channels comprises: The TCI state is identified at least in part based on explicit rules.

7. The method of claim 6, further comprising: Receive an indication from the network entity that the TCI state should be used as the default beam for aperiodic CSI-RS.

8. The method of claim 7, wherein receiving an indication regarding the TCI state to be used as the default beam for aperiodic CSI-RS comprises: The instruction is received via at least one of DCI communication, Media Access Control (MAC) Control Element (MAC-CE) communication, or Radio Resource Control (RRC) communication.

9. The method of claim 7, wherein receiving an indication regarding the TCI state to be used as the default beam for aperiodic CSI-RS comprises: The same signal is received indicating the TCI state and indicating whether the TCI state should be used as the default beam for aperiodic CSI-RS.

10. The method of claim 1, wherein identifying the TCI state associated with at least two signals or at least two communication channels comprises: The TCI state indicates that it is to be used in a multiple transmit / receive point (multiple TRP) configuration.

11. The method of claim 10, wherein the TCI state to be used for the multi-TRP configuration is associated with a single beam or multiple beams.

12. The method of claim 10, wherein the TCI state associated with a TRP in the multi-TRP configuration is to be used as the default beam for the aperiodic CSI-RS associated with the TRP.

13. The method of claim 1, further comprising: Receive an indication from the network entity that the TCI state should not be used as the default beam for aperiodic CSI-RS.

14. The method of claim 13, further comprising: The alternative default beam for aperiodic CSI-RS is determined at least in part based on the quasi-co-location assumption of the control resource set with the lowest identifier in the latest monitored time slot of the bandwidth portion, wherein the bandwidth portion includes the active downlink bandwidth portion.

15. The method of claim 13, further comprising: Another TCI state determined before identifying the TCI state is to be used as the new default beam for aperiodic CSI-RS.

16. The method of claim 1, further comprising: Receive the scheduling DCI of the aperiodic CSI-RS, wherein the DCI indicates the transmission time of the aperiodic CSI-RS; as well as The scheduling offset between the transmission time of the scheduling DCI and the aperiodic CSI-RS is determined to be less than the beam switching wait time threshold.

17. A method for wireless communication performed by a network entity, comprising: Transmit to User Equipment (UE) an indication that a Transmission Configuration Indicator (TCI) state associated with at least two signals or at least two communication channels is to be used as the default beam for an aperiodic Channel State Information Reference Signal (CSI-RS), wherein the same TCI state will be used when the at least two signals or at least two communication channels are used for transmission; as well as Transmit to the UE a non-periodic CSI-RS to be received by the UE using the TCI state as the default beam.

18. The method of claim 17, further comprising: The UE is transmitted a configuration indicating that if the scheduling offset between the scheduling DCI and the transmission time of the aperiodic CSI-RS scheduled by the scheduling DCI is less than a beam switching wait time threshold, the UE will use the default beam for the aperiodic CSI-RS.

19. The method of claim 17, wherein the TCI state is identified by the UE at least in part based on an implicit indication.

20. The method of claim 19, wherein transmitting an indication regarding the TCI state to be used as the default beam for aperiodic CSI-RS comprises: The instruction is transmitted via at least one of DCI communication, Media Access Control (MAC) Control Element (MAC-CE) communication, or Radio Resource Control (RRC) communication.

21. The method of claim 17, further comprising: The UE is informed of the TCI status.

22. The method of claim 21, wherein transmitting an indication regarding the TCI state to be used as the default beam for aperiodic CSI-RS comprises: The instruction is transmitted via at least one of DCI communication, Media Access Control (MAC) Control Element (MAC-CE) communication, or Radio Resource Control (RRC) communication.

23. The method of claim 21, wherein transmitting an indication regarding the TCI state to be used as the default beam for aperiodic CSI-RS comprises: The indication of the TCI state and the indication that the TCI state should be used as the default beam for aperiodic CSI-RS are transmitted in the same signal.

24. The method of claim 17, further comprising: Determine that the TCI state is to be used in a multiple transmit / receive point (multiple TRP) configuration.

25. The method of claim 24, wherein transmitting an indication regarding the TCI state to be used as the default beam for aperiodic CSI-RS comprises: The UE is informed that the TCI state associated with a TRP in the multi-TRP configuration is to be used as the default beam for the aperiodic CSI-RS associated with the TRP.

26. The method of claim 17, further comprising: The UE is informed that the TCI state is no longer intended to be used as the default beam.

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 being configured to: Identify the Transmission Configuration Indicator (TCI) state associated with at least two signals or at least two communication channels, wherein the same TCI state is used when receiving using the at least two signals or at least two communication channels; and The TCI state is used as the default beam to receive the aperiodic CSI-RS, based at least in part on the fact that the scheduling offset between the scheduling downlink control information (DCI) of the scheduling aperiodic channel state information reference signal (CSI-RS) and the transmission time of the aperiodic CSI-RS is less than a beam switching wait time threshold.

28. The UE of claim 27, wherein using the TCI state as the default beam is at least in part based on always using the TCI state as the default beam.

29. The UE of claim 27, wherein the one or more processors configured to identify TCI states associated with at least two signals or at least two communication channels are further configured to: The TCI state is identified at least in part based on implicit rules.

30. The UE of claim 29, wherein the one or more processors are further configured to: Receive an indication from the network entity that the TCI state should be used as the default beam for aperiodic CSI-RS.

31. The UE of claim 30, wherein the one or more processors configured to receive an indication regarding the TCI state to be used as the default beam for aperiodic CSI-RS are further configured to: The instruction is received via at least one of DCI communication, Media Access Control (MAC) Control Element (MAC-CE) communication, or Radio Resource Control (RRC) communication.

32. The UE of claim 27, wherein the one or more processors configured to identify TCI states associated with at least two signals or at least two communication channels are further configured to: The TCI state is identified at least in part based on explicit rules.

33. The UE of claim 32, wherein the one or more processors are further configured to: Receive an indication from the network entity that the TCI state should be used as the default beam for aperiodic CSI-RS.

34. The UE of claim 33, wherein the one or more processors configured to receive an indication regarding the TCI state to be used as the default beam for aperiodic CSI-RS are further configured to: The instruction is received via at least one of DCI communication, Media Access Control (MAC) Control Element (MAC-CE) communication, or Radio Resource Control (RRC) communication.

35. The UE of claim 33, wherein the one or more processors configured to receive an indication regarding the TCI state to be used as the default beam for aperiodic CSI-RS are further configured to: The same signal is received indicating the TCI state and indicating whether the TCI state should be used as the default beam for aperiodic CSI-RS.

36. The UE of claim 27, wherein the one or more processors configured to identify TCI states associated with at least two signals or at least two communication channels are further configured to: The TCI state indicates that it is to be used in a multiple transmit / receive point (multiple TRP) configuration.

37. The UE of claim 36, wherein the TCI state to be used for the multi-TRP configuration is associated with a single beam or multiple beams.

38. The UE of claim 36, wherein the TCI state associated with a TRP in the multi-TRP configuration is to be used as the default beam for the aperiodic CSI-RS associated with the TRP.

39. The UE of claim 27, wherein the one or more processors are further configured to: Receive an indication from the network entity that the TCI state should not be used as the default beam for aperiodic CSI-RS.

40. The UE of claim 39, wherein the one or more processors are further configured to: The alternative default beam for aperiodic CSI-RS is determined at least in part based on the quasi-co-location assumption of the control resource set with the lowest identifier in the latest monitored time slot of the bandwidth portion, wherein the bandwidth portion includes the active downlink bandwidth portion.

41. The UE of claim 39, wherein the one or more processors are further configured to: Another TCI state determined before identifying the TCI state is to be used as the new default beam for aperiodic CSI-RS.

42. The UE of claim 27, wherein the one or more processors are further configured to: Receive the scheduling DCI for the aperiodic CSI-RS, wherein the DCI indicates the transmission time of the aperiodic CSI-RS; and The scheduling offset between the transmission time of the scheduling DCI and the aperiodic CSI-RS is determined to be less than the beam switching wait time threshold.

43. A network entity for wireless communication, comprising: Memory; as well as One or more processors coupled to the memory, the one or more processors being configured to: Transmit to User Equipment (UE) an indication that a Transmission Configuration Indicator (TCI) state associated with at least two signals or at least two communication channels is to be used as the default beam for an aperiodic Channel State Information Reference Signal (CSI-RS), wherein the same TCI state will be used when the at least two signals or at least two communication channels are used for transmission; as well as Transmit to the UE a non-periodic CSI-RS to be received by the UE using the TCI state as the default beam.

44. The network entity of claim 43, wherein the one or more processors are further configured to: The UE is transmitted a configuration indicating that if the scheduling offset between the scheduling DCI and the transmission time of the aperiodic CSI-RS scheduled by the scheduling DCI is less than a beam switching wait time threshold, the UE will use the default beam for the aperiodic CSI-RS.

45. The network entity of claim 43, wherein the TCI state is identified by the UE at least in part based on an implicit indication.

46. ​​The network entity of claim 45, wherein the one or more processors configured to transmit an indication regarding the TCI state to be used as the default beam for aperiodic CSI-RS are further configured to: The instruction is transmitted via at least one of DCI communication, Media Access Control (MAC) Control Element (MAC-CE) communication, or Radio Resource Control (RRC) communication.

47. The network entity of claim 43, wherein the one or more processors are further configured to: The UE is informed of the TCI status.

48. The network entity of claim 47, wherein the one or more processors configured to transmit an indication regarding the TCI state to be used as the default beam for aperiodic CSI-RS are further configured to: The instruction is transmitted via at least one of DCI communication, Media Access Control (MAC) Control Element (MAC-CE) communication, or Radio Resource Control (RRC) communication.

49. The network entity of claim 47, wherein the one or more processors configured to transmit an indication regarding the TCI state to be used as the default beam for aperiodic CSI-RS are further configured to: The indication of the TCI state and the indication that the TCI state should be used as the default beam for aperiodic CSI-RS are transmitted in the same signal.

50. The network entity of claim 43, wherein the one or more processors are further configured to: Determine that the TCI state is to be used in a multiple transmit / receive point (multiple TRP) configuration.

51. The network entity of claim 50, wherein the one or more processors configured to transmit an indication regarding the TCI state to be used as the default beam for aperiodic CSI-RS are further configured to: The UE is informed that the TCI state associated with a TRP in the multi-TRP configuration is to be used as the default beam for the aperiodic CSI-RS associated with the TRP.

52. The network entity of claim 43, wherein the one or more processors are further configured to: The UE is informed that the TCI state is no longer intended to be used as the default beam.

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