Patent Publication Number: US-2021195616-A1

Title: Techniques for signaling uplink transmission configuration indicator states

Description:
CROSS-REFERENCE TO RELATED APPLICATION(S) 
     This application claims the benefit of U.S. Provisional Application Ser. No. 62/949,959, entitled “TECHNIQUES FOR SIGNALING UPLINK TRANSMISSION CONFIGURATION INDICATOR STATES” and filed on Dec. 18, 2019, which is expressly incorporated by reference herein in its entirety. 
    
    
     BACKGROUND 
     Aspects of the present disclosure relate generally to communication systems, and more particularly, to techniques for signaling uplink transmission configuration indicator (TCI) states. 
     Wireless communication systems are widely deployed to provide various telecommunication services such as telephony, video, data, messaging, and broadcasts. Typical wireless communication systems may employ multiple-access technologies capable of supporting communication with multiple users by sharing available system resources. 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, and time division synchronous code division multiple access (TD-SCDMA) systems. 
     These multiple access technologies have been adopted in various telecommunication standards to provide a common protocol that enables different wireless devices to communicate on a municipal, national, regional, and even global level. An example telecommunication standard is fifth generation (5G) new radio (NR) technologies. 5G NR technologies are a part of a continuous mobile broadband evolution promulgated by Third Generation Partnership Project (3GPP) to meet new requirements associated with latency, reliability, security, scalability (e.g., with Internet of Things (IoT)), and other requirements. 5G NR technologies include services associated with enhanced mobile broadband (eMBB), massive machine type communications (mMTC), and ultra reliable low latency communications (URLLC). Some aspects of 5G NR technologies may be based on the fourth generation (4G) Long Term Evolution (LTE) standard. 
     During beam management, different schemes, including space division multiplexing (SDM) schemes, frequency division multiplexing (FDM) schemes, or time division multiplexing (TDM) schemes, may be used across multiple transmission and reception points. These schemes may allow for a more unified TCI framework for downlink (DL) and uplink (UL) beam indication. While wireless networks provide signaling for configuring DL transmissions according to the different schemes, these wireless networks do not provide signaling for configuring the UL transmissions based on the schemes. Accordingly, there exists a need for further improvements in 5G NR technologies. 
     SUMMARY 
     The following presents a simplified summary of one or more aspects in order to provide a basic understanding of such aspects. This summary is not an extensive overview of all contemplated aspects, and is intended to neither identify key or critical elements of all aspects nor delineate the scope of any or all aspects. Its sole purpose is to present some concepts of one or more aspects in a simplified form as a prelude to the more detailed description that is presented later. 
     In an aspect, a method of wireless communication by a user equipment (UE) is provided. The method may include receiving, from a base station, signaling indicating one or more uplink (UL) transmission configuration indicator (TCI) states; configuring, based on the signaling indicating the one or more UL TCI states, the one or more UL TCI states to be used by the UE for UL transmissions; and transmitting, to the base station, the UL transmissions based on the one or more UL TCI states. 
     In another aspect, a method of wireless communication by a UE is provided. The method may include receiving, from a base station, signaling indicating a first UL TCI codepoint mapped to one or more first UL TCI states; determining that the one or more first UL TCI states of the first UL TCI codepoint are not configured for UL transmissions; determining, in response to the one or more first UL TCI states not being configured, one or more second UL TCI states of a default UL TCI codepoint that are configured for the UL transmissions; and transmitting, to the base station, the UL transmissions based on the one or more second UL TCI states. 
     In another aspect, a method of wireless communication by a base station is provided. The method may include determining one or more capabilities of a UE; determining one or more UL TCI states for the UE to use based on the one or more capabilities; and transmitting, to the UE, signaling of the one or more UL TCI states. 
     In another aspect, a method of wireless communication by a base station is provided. The method may include transmitting, to a UE, signaling indicating a first UL TCI codepoint mapped to one or more first UL TCI states; receiving, from the UE in response to the transmitting the signaling, UL transmissions based on one or more second UL TCI states of a default UL TCI codepoint; determining, based on the received UL transmissions, that the one or more first UL TCI states of the first codepoint were not configured for UL transmissions; and storing an indication that the one or more first UL TCI states are not configured by the UE for the UL transmissions. 
     In one or more other aspects, apparatus and computer-readable mediums which perform the methods described herein are disclosed. 
     To the accomplishment of the foregoing and related ends, the one or more aspects comprise the features hereinafter fully described and particularly pointed out in the claims. The following description and the annexed drawings set forth in detail certain illustrative features of the one or more aspects. These features are indicative, however, of but a few of the various ways in which the principles of various aspects may be employed, and this description is intended to include all such aspects and their equivalents. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       The disclosed aspects will hereinafter be described in conjunction with the appended drawings, provided to illustrate and not to limit the disclosed aspects, wherein like designations denote like elements, and in which: 
         FIG. 1  is a schematic diagram of an example wireless communications system and access network, according to aspects of the present disclosure; 
         FIG. 2  is a flowchart of an example method of wireless communications by a UE, according to aspects of the present disclosure; 
         FIG. 3  is a flowchart of another example method of wireless communications by a UE, according to aspects of the present disclosure; 
         FIG. 4  is a schematic diagram of an example of the UE of  FIG. 1 , according to aspects of the present disclosure; 
         FIG. 5  is a flowchart of an example method of wireless communications by a base station, according to aspects of the present disclosure; 
         FIG. 6  is a flowchart of another example method of wireless communications by a base station, according to aspects of the present disclosure; and 
         FIG. 7  is a schematic diagram of an example of the base station of  FIG. 1 , according to aspects of the present disclosure. 
     
    
    
     DETAILED DESCRIPTION 
     The detailed description, set forth below, in connection with the appended drawings is intended as a description of various configurations and is not intended to represent the only configurations in which the concepts described herein may be practiced. The detailed description includes specific details for the purpose of providing a thorough understanding of various concepts. However, it will be apparent to those skilled in the art that these concepts may be practiced without these specific details. In some instances, well known structures and components are shown in block diagram form in order to avoid obscuring such concepts. 
     Several aspects of telecommunication systems will now be presented with reference to various apparatus and methods. These apparatus and methods will be described in the following detailed description and illustrated in the accompanying drawings by various blocks, components, circuits, processes, algorithms, etc. (collectively referred to as “elements”). These elements may be implemented using electronic hardware, computer software, or any combination thereof. Whether such elements are implemented as hardware or software depends upon the particular application and design constraints imposed on the overall system. 
     By way of example, an element, or any portion of an element, or any combination of elements may be implemented as a “processing system” that includes one or more processors. Examples of processors include microprocessors, microcontrollers, graphics processing units (GPUs), central processing units (CPUs), application processors, digital signal processors (DSPs), reduced instruction set computing (RISC) processors, systems on a chip (SoC), baseband processors, field programmable gate arrays (FPGAs), programmable logic devices (PLDs), state machines, gated logic, discrete hardware circuits, and other suitable hardware configured to perform the various functionality described throughout this disclosure. One or more processors in the processing system may execute software. Software shall be construed broadly to mean instructions, instruction sets, code, code segments, program code, programs, subprograms, software components, applications, software applications, software packages, routines, subroutines, objects, executables, threads of execution, procedures, functions, etc., whether referred to as software, firmware, middleware, microcode, hardware description language, or otherwise. 
     Accordingly, in one or more example embodiments, the functions described may be implemented in hardware, software, or any combination thereof. If implemented in software, the functions may be stored on or encoded as one or more instructions or code on a computer-readable medium. Computer-readable media includes computer storage media. Storage media may be any available media that can be accessed by a computer. By way of example, and not limitation, such computer-readable media can comprise a random-access memory (RAM), a read-only memory (ROM), an electrically erasable programmable ROM (EEPROM), optical disk storage, magnetic disk storage, other magnetic storage devices, combinations of the aforementioned types of computer-readable media, or any other medium that can be used to store computer executable code in the form of instructions or data structures that can be accessed by a computer. 
     Enhancements to multi-beam operations, such as frequency range 2 (FR2) and frequency range 1 (FR1), may include identifying and specifying features to facilitate more efficient (e.g., lower latency and overhead) downlink (DL)/uplink (UL) beam management to support higher intra-cell mobility and layer 1 (L1)/layer 2 (L2)-centric inter-cell mobility and/or a larger number of configured transmission configuration indicator (TCI) states. These features may include: common beams for data and control transmission/reception for DL and UL transmissions, especially for intra-band carrier aggregation (CA); unified TCI framework for DL/UL beam indication; and enhancements on signaling mechanisms for the above features to improve latency and efficiency, such as more dynamic usage of control signalling, as opposed to radio resource control (RRC) signals. 
     The enhancements may also include identifying and specifying features to facilitate UL beam selection for user equipments (UEs) equipped with multiple panels including: UL beam indications based on the unified TCI framework; enabling simultaneous transmission across multiple panels (STxMP); and/or enabling panel selection. The enhancements may also include studying UE-initiated or L1-event-driven beam management for reducing latency and probability of beam failure events. 
     Additionally, enhancements for the support of multi-transmission and reception points (mTRPs) deployment, which may target both FR1 and FR2, may include identifying and specifying features to improve reliability and robustness for channels other than physical DL share channel (PDSCH), such as physical DL control channel (PDCCH), physical UL share channel (PUSCH), and physical UL control channel (PUCCH) using mTRPs and/or multi-panels, with reliability features used as a baseline. These enhancements may also include identifying and specifying features to enable inter-cell multi-TRP operations. These enhancements may also include evaluating and, if needed, specifying enhancements for simultaneous multi-TRP transmission with multi-panel reception. 
     For UL transmissions, space division multiplexing (SDM)/frequency division multiplexing (FDM)/time division multiplexing (TDM) schemes across mTRPs may also be extended. By using these schemes for UL transmissions, a more unified TCI framework for DL and UL beam indication may be achieved. Alternatively, introduction of a UL-TCI framework and support for UL-TCI based signalling analogous to DL beam indication may be considered to support multi-panel enhancements for UL. In the context of a DL, the schemes are supported as follows: scheme 1—SDM; scheme 2a—FDM and one control word (CW); scheme 2b—FDM and two CWs of the same transport block (TB); scheme 3—TDM within a slot; and scheme 4—TDM in different slots. These schemes may be extended for UL. 
     According to aspects of the present disclosure, multiple UL TCI states may be used to indicate UL transmissions. In an example, the multiple TCI states may be based on one or more SDM schemes, FDM schemes, or TDM schemes across indicated UL TCI states. 
     In another aspect, multiple UL TCI states may be mapped to a single UL TCI codepoint of a DL configuration indicator (DCI) that is scheduling a UL transmission. The multiple UL TCI states may be indicated through signalling, such as one or more of a DCI signal, a media access control-control element (MAC-CE) signal, or a radio resource control (RRC) signal. In some examples, the multiple UL TCI states are mapped to a single DCI based UL mTRP transmission. 
     In an aspect, multiple UL TCI states can be mapped to one composite mTRP UL TCI state in a DCI that is scheduling a UL transmission. The indication of these multiple UL TCI states may be signalled via, for example, a DCI signal, a MAC-CE signal, or an RRC signal. In an example, UL transmissions may include one or more sound reference signal (SRS), PUCCH signal, PUSCH signal, or PRACH signal. 
     In case of SDM, UL signals indicated by UL TCI states may be transmitted simultaneously in overlapped frequency resources. In case of FDM, UL signals indicated by UL TCI states may be transmitted simultaneously in non-overlapped frequency resources. In case of TDM, UL signals indicated by UL TCI states may be transmitted in different time resources, either slot or sub-slot based TDM. 
     In another aspect, at least one UL TCI codepoint may be mapped to multiple UL TCI states. For example, multiple UL TCI states may be mapped to a single DCI based on a UL mTRP operation mode. However, when a UE receives an indication of the multiple UL TCI states, the UE may be unable to use some of the UL TCI states due to, for example, a UL TCI state not being configured (e.g., when a relation or UL TCI is not indicated for certain resources or when a scheduled UL transmission is within a time-domain scheduling threshold). Accordingly, a default UL beam of SRS, PUCCH, PUSCH, or PRACH, may be used based on the previously used TCI codepoint. In an example, the UL beam may rely on a lowest index or a highest index of previously used UL TCI codepoint or rely on a recent successfully used TCI codepoint. 
     Turning now to the figures, examples of techniques for signaling UL TCI states are depicted. It is to be understood that aspects of the figures may not be drawn to scale and are instead drawn for illustrative purposes. 
     Referring to  FIG. 1 , a diagram illustrating an example of a wireless communications system and an access network  100  is provided. The wireless communications system (also referred to as a wireless wide area network (WWAN)) includes base stations  102 , UEs  104 , an Evolved Packet Core (EPC)  160 , and a 5G Core (5GC)  190 . 
     The base station  102  may include a modem  140  having a TCI signaling component  142  configured to signal to the UE  104  multiple TCI states and a codepoint indicating the multiple TCI states. For example, the TCI signaling component  142  may determine one or more capabilities of the UE  104 , determine one or more UL TCI states for the UE  104  to use based on the one or more capabilities, and transmit, to the UE  104 , signaling of the one or more UL TCI states. 
     In another example, the TCI signaling component  142  may transmit, to the UE  104 , signaling indicating a first UL TCI codepoint mapped to one or more first UL TCI states, receive, from the UE  104  in response to the transmitting the signaling, UL transmissions based on one or more second UL TCI states of a default UL TCI codepoint, determine, based on the received UL transmissions, that the one or more first UL TCI states of the first codepoint were not configured for UL transmissions, and store an indication that the one or more first UL TCI states are not configured by the UE  104  for the UL transmissions. 
     The UE  104  may include a modem  144  having a UL configuration component  146  configured to receive signaling from the base station  102  and transmit a UL transmission based on the signaling. For example, the UL configuration component  146  may receive, from the base station  102 , signaling indicating a first UL TCI codepoint mapped to one or more first UL TCI states, determine that the one or more first UL TCI states of the first UL TCI codepoint are not configured for UL transmissions, determine, in response to the one or more first UL TCI states not being configured, one or more second UL TCI states of a default UL TCI codepoint that are configured for the UL transmissions, and transmit, to the base station, the UL transmissions based on the one or more second UL TCI states. 
     In another example, the UL configuration component  146  may receive, from a base station  102 , signaling indicating a first UL TCI codepoint mapped to one or more first UL TCI states, determine that the one or more first UL TCI states of the first UL TCI codepoint are not configured for UL transmissions, determine, in response to the one or more first UL TCI states not being configured, one or more second UL TCI states of a default UL TCI codepoint that are configured for the UL transmissions, and transmit, to the base station, the UL transmissions based on the one or more second UL TCI states. 
     In an aspect, the base stations  102  may include macro cells (high power cellular base station) and/or small cells (low power cellular base station). The macro cells include base stations. The small cells include femtocells, picocells, and microcells. 
     The base stations  102  configured for 4G LTE (collectively referred to as Evolved Universal Mobile Telecommunications System (UMTS) Terrestrial Radio Access Network (E-UTRAN)) may interface with the EPC  160  through backhaul links  132  (e.g., S1 interface). The base stations  102  configured for 5GNR (collectively referred to as Next Generation RAN (NG-RAN)) may interface with 5GC  190  through backhaul links  184 . In addition to other functions, the base stations  102  may perform one or more of the following functions: transfer of user data, radio channel ciphering and deciphering, integrity protection, header compression, mobility control functions (e.g., handover, dual connectivity), inter-cell interference coordination, connection setup and release, load balancing, distribution for non-access stratum (NAS) messages, NAS node selection, synchronization, radio access network (RAN) sharing, multimedia broadcast multicast service (MBMS), subscriber and equipment trace, RAN information management (RIM), paging, positioning, and delivery of warning messages. The base stations  102  may communicate directly or indirectly (e.g., through the EPC  160  or 5GC  190 ) with each other over backhaul links  134  (e.g., X2 interface). Each of the backhaul links  132 ,  134 , and  184  may be wired or wireless. 
     The base stations  102  may wirelessly communicate with the UEs  104 . Each of the base stations  102  may provide communication coverage for a respective geographic coverage area  110 . There may be overlapping geographic coverage areas  110 . For example, the small cell  102 ′ may have a coverage area  110 ′ that overlaps the coverage area  110  of one or more macro base stations  102 . A network that includes both small cell and macro cells may be known as a heterogeneous network. A heterogeneous network may also include Home Evolved Node Bs (eNBs) (HeNBs), which may provide service to a restricted group known as a closed subscriber group (CSG). The communication links  120  between the base stations  102  and the UEs  104  may include UL (also referred to as reverse link) transmissions from a UE  104  to a base station  102  and/or DL (also referred to as forward link) transmissions from a base station  102  to a UE  104 . The communication links  120  may use multiple-input and multiple-output (MIMO) antenna technology, including spatial multiplexing, beamforming, and/or transmit diversity. The communication links may be through one or more carriers. The base stations  102 /UEs  104  may use spectrum up to Y MHz (e.g., 5, 10, 15, 20, 100, 400, etc. MHz) bandwidth per carrier allocated in a carrier aggregation of up to a total of Yx MHz (x component carriers) used for transmission in each direction. The carriers may or may not be adjacent to each other. Allocation of carriers may be asymmetric with respect to DL and UL (e.g., more or less carriers may be allocated for DL than for UL). The component carriers may include a primary component carrier and one or more secondary component carriers. A primary component carrier may be referred to as a primary cell (PCell) and a secondary component carrier may be referred to as a secondary cell (SCell). 
     Certain UEs  104  may communicate with each other using device-to-device (D2D) communication link  158 . The D2D communication link  158  may use the DL/UL WWAN spectrum. The D2D communication link  158  may use one or more sidelink channels, such as a physical sidelink broadcast channel (PSBCH), a physical sidelink discovery channel (PSDCH), a physical sidelink shared channel (PSSCH), and a physical sidelink control channel (PSCCH). D2D communication may be through a variety of wireless D2D communications systems, such as for example, FlashLinQ, WiMedia, Bluetooth, ZigBee, Wi-Fi based on the IEEE 802.11 standard, LTE, or NR. 
     The wireless communications system may further include a Wi-Fi access point (AP)  150  in communication with Wi-Fi stations (STAs)  152  via communication links  154  in a 5 GHz unlicensed frequency spectrum. When communicating in an unlicensed frequency spectrum, the STAs  152 /AP  150  may perform a clear channel assessment (CCA) prior to communicating in order to determine whether the channel is available. 
     The small cell  102 ′ may operate in a licensed and/or an unlicensed frequency spectrum. When operating in an unlicensed frequency spectrum, the small cell  102 ′ may employ NR and use the same 5 GHz unlicensed frequency spectrum as used by the Wi-Fi AP  150 . The small cell  102 ′, employing NR in an unlicensed frequency spectrum, may boost coverage to and/or increase capacity of the access network. 
     A base station  102 , whether a small cell  102 ′ or a large cell (e.g., macro base station), may include an eNB, gNodeB (gNB), or other type of base station. Some base stations, such as gNB  180  may operate in a traditional sub 6 GHz spectrum, in millimeter wave (mmW) frequencies, and/or near mmW frequencies in communication with the UE  104 . When the gNB  180  operates in mmW or near mmW frequencies, the gNB  180  may be referred to as an mmW base station. Extremely high frequency (EHF) is part of the RF in the electromagnetic spectrum. EHF has a range of 30 GHz to 300 GHz and a wavelength between 1 millimeter and 10 millimeters. Radio waves in the band may be referred to as a millimeter wave. Near mmW may extend down to a frequency of 3 GHz with a wavelength of 100 millimeters. The super high frequency (SHF) band extends between 3 GHz and 30 GHz, also referred to as centimeter wave. Communications using the mmW/near mmW radio frequency band has extremely high path loss and a short range. The mmW base station  180  may utilize beamforming  182  with the UE  104  to compensate for the extremely high path loss and short range. 
     The EPC  160  may include a Mobility Management Entity (MME)  162 , other MMEs  164 , a Serving Gateway  166 , a Multimedia Broadcast Multicast Service (MBMS) Gateway  168 , a Broadcast Multicast Service Center (BM-SC)  170 , and a Packet Data Network (PDN) Gateway  172 . The MME  162  may be in communication with a Home Subscriber Server (HSS)  174 . The MME  162  is the control node that processes the signaling between the UEs  104  and the EPC  160 . Generally, the MME  162  provides bearer and connection management. All user Internet protocol (IP) packets are transferred through the Serving Gateway  166 , which itself is connected to the PDN Gateway  172 . The PDN Gateway  172  provides UE IP address allocation as well as other functions. The PDN Gateway  172  and the BM-SC  170  are connected to the IP Services  176 . The IP Services  176  may include the Internet, an intranet, an IP Multimedia Subsystem (IMS), a PS Streaming Service, and/or other IP services. The BM-SC  170  may provide functions for MBMS user service provisioning and delivery. The BM-SC  170  may serve as an entry point for content provider MBMS transmission, may be used to authorize and initiate MBMS Bearer Services within a public land mobile network (PLMN), and may be used to schedule MBMS transmissions. The MBMS Gateway  168  may be used to distribute MBMS traffic to the base stations  102  belonging to a Multicast Broadcast Single Frequency Network (MBSFN) area broadcasting a particular service, and may be responsible for session management (start/stop) and for collecting eMBMS related charging information. 
     The 5GC  190  may include a Access and Mobility Management Function (AMF)  192 , other AMFs  193 , a Session Management Function (SMF)  194 , and a User Plane Function (UPF)  195 . The AMF  192  may be in communication with a Unified Data Management (UDM)  196 . The AMF  192  is the control node that processes the signaling between the UEs  104  and the 5GC  190 . Generally, the AMF  192  provides QoS flow and session management. All user Internet protocol (IP) packets are transferred through the UPF  195 . The UPF  195  provides UE IP address allocation as well as other functions. The UPF  195  is connected to the IP Services  197 . The IP Services  197  may include the Internet, an intranet, an IP Multimedia Subsystem (IMS), a PS Streaming Service, and/or other IP services. 
     The base station  102  may also be referred to as a gNB, Node B, evolved Node B (eNB), an access point, a base transceiver station, a radio base station, a radio transceiver, a transceiver function, a basic service set (BSS), an extended service set (ESS), a transmit reception point (TRP), or some other suitable terminology. The base station  102  provides an access point to the EPC  160  or 5GC  190  for a UE  104 . Examples of UEs  104  include a cellular phone, a smart phone, a session initiation protocol (SIP) phone, a laptop, a personal digital assistant (PDA), a satellite radio, a global positioning system, a multimedia device, a video device, a digital audio player (e.g., MP3 player), a camera, a game console, a tablet, a smart device, a wearable device, a vehicle, an electric meter, a gas pump, a large or small kitchen appliance, a healthcare device, an implant, a sensor/actuator, a display, or any other similar functioning device. Some of the UEs  104  may be referred to as IoT devices (e.g., parking meter, gas pump, toaster, vehicles, heart monitor, etc.). The UE  104  may also be referred to as a station, a mobile station, a subscriber station, a mobile unit, a subscriber unit, a wireless unit, a remote unit, a mobile device, a wireless device, a wireless communications device, a remote device, a mobile subscriber station, an access terminal, a mobile terminal, a wireless terminal, a remote terminal, a handset, a user agent, a mobile client, a client, or some other suitable terminology. 
     Referring to  FIGS. 2 and 3 , example methods  200  and  300  of wireless communications are disclosed. The methods  200  and  300  may be performed by the UE  104  of  FIG. 1  along with any of the components (see e.g.,  FIG. 4 ) of the UE  104 . For example, the methods  200  and  300  may be performed by one or more of a processor  412 , a transceiver  402 , the modem  144 , the UL configuration component  146 , and/or one or more additional components/subcomponents of the UE  104 . 
     Turning to  FIG. 2 , at  202 , the method  200  may optionally include transmitting, to the base station, an indication of one or more capabilities of the UE. For example, one or more of the processor  412 , the transceiver  402 , the modem  144 , the UL configuration component  146 , and/or one or more components/subcomponents of the UE  104  may be configured to transmit, to the base station  102 , an indication of one or more capabilities of the UE  104 . Thus, the processor  412 , the transceiver  402 , the modem  144 , the UL configuration component  146 , and/or one or more components/subcomponents of the UE  104  may define the means for transmitting, to the base station  102 , an indication of one or more capabilities of the UE  104 . In an example, the one or more capabilities of the UE  104  may include, for example, capabilities of the UE  104  to support multiple transmissions from multiple panels of a base station  102  or capabilities of the UE  104  to support a switching time to activate transmissions between panels of the base station  102 . 
     At  204 , the method  200  may include receiving, from a base station, signaling indicating one or more UL TCI states. For example, one or more of the processor  412 , the transceiver  402 , the modem  144 , the UL configuration component  146 , and/or one or more components/subcomponents of the UE  104  may be configured to receive, from the base station  102 , signaling indicating one or more UL TCI states. Thus, the processor  412 , the transceiver  402 , the modem  144 , the UL configuration component  146 , and/or one or more components/subcomponents of the UE  104  may define the means for receiving, from the base station  102 , signaling indicating one or more UL TCI states. In an example, the signaling indicating the one or more UL TCI states is indicated via a mapping of the one or more UL TCI states to a single UL TCI codepoint. In an example, the signaling may be received via one or more of a DCI signal, a MAC-CE signal, or an RRC signal. In an example, the signaling may indicate the one or more UL TCI states via a mapping of the one or more UL TCI states to a single composite mTRP UL TCI state. 
     In an example, the one or more UL TCI states may be based on one or more of an SDM scheme, an FDM scheme, or a TDM scheme. When the one or more UL TCI states are based on the SDM scheme, the UL transmissions may be transmitted simultaneously in overlapped frequency resources. When the one or more UL TCI states are based on the FDM scheme, the UL transmissions may be transmitted simultaneously in non-overlapped frequency resources. When the one or more UL TCI states are based on the TDM scheme, the UL transmissions may be transmitted in different time resources. 
     At  206 , the method  200  may include receiving, from the base station, signaling indicating a codepoint that schedules the one or more of the UL transmissions. For example, one or more of the processor  412 , the transceiver  402 , the modem  144 , the UL configuration component  146 , and/or one or more components/subcomponents of the UE  104  may be configured to receive, from the base station  102 , signaling indicating a codepoint that schedules the one or more of the UL transmissions. Thus, the processor  412 , the transceiver  402 , the modem  144 , the UL configuration component  146 , and/or one or more components/subcomponents of the UE  104  may define the means for receiving, from the base station  102 , signaling indicating a codepoint that schedules the one or more of the UL transmissions. In an example, the codepoint is a code, a string, or one or more bits of a DCI signal. In an example, the UL transmissions are one or more of a SRS, a PUCCH, a PUSCH, or a PRACH. 
     At  208 , the method  200  may include configuring, based on the signaling indicating the one or more UL TCI states, the one or more UL TCI states to be used by the UE for UL transmissions. For example, one or more of the processor  412 , the modem  144 , the UL configuration component  146 , and/or one or more components/subcomponents of the UE  104  may be configured to configure, based on the signaling indicating the one or more UL TCI states, the one or more UL TCI states to be used by the UE  104  for UL transmissions. Thus, the processor  412 , the modem  144 , the UL configuration component  146 , and/or one or more components/subcomponents of the UE  104  may define the means for configuring, based on the signaling indicating the one or more UL TCI states, the one or more UL TCI states to be used by the UE  104  for UL transmissions. In an example, the determining of the one or more UL TCI states may be further based on the signaling indicating the codepoint. In an example, the one or more UL TCI states may be configured based on configuring one or more spatial relations parameters of one or more beams and using ports or signals that satisfy quasi co-location (QCL) properties as indicated by the TCI state for the UL transmission in scheduled time/frequency resources. 
     At  210 , the method  200  may include transmitting, to the base station, the UL transmissions based on the one or more UL TCI states. For example, one or more of the processor  412 , the transceiver  402 , the modem  144 , the UL configuration component  146 , and/or one or more components/subcomponents of the UE  104  may be configured to transmit, to the base station  102 , the UL transmissions based on the one or more UL TCI states. Thus, the processor  412 , the transceiver  402 , the modem  144 , the UL configuration component  146 , and/or one or more components/subcomponents of the UE  104  may define the means for transmitting, to the base station  102 , the UL transmissions based on the one or more UL TCI states. 
     Turning to  FIG. 3 , at  302 , the method  300  may include receiving, from a base station, signaling indicating a first UL TCI codepoint mapped to one or more first UL TCI states. For example, one or more of the processor  412 , the transceiver  402 , the modem  144 , the UL configuration component  146 , and/or one or more components/subcomponents of the UE  104  may be configured to receive, from the base station  102 , signaling indicating a first UL TCI codepoint mapped to one or more first UL TCI states. Thus, the processor  412 , the transceiver, the modem  144 , the UL configuration component  146 , and/or one or more components/subcomponents of the UE  104  may define the means for receiving, from a base station  102 , signaling indicating the first UL TCI codepoint mapped to one or more first UL TCI states. 
     At  304 , the method  300  may include determining that the one or more first UL TCI states of the first UL TCI codepoint are not configured for UL transmissions. For example, one or more of the processor  412 , the modem  144 , the UL configuration component  146 , and/or one or more components/subcomponents of the UE  104  may be configured to determine that the one or more first UL TCI states of the first UL TCI codepoint are not configured for UL transmissions. Thus, the processor  412 , the transceiver, the modem  144 , the UL configuration component  146 , and/or one or more components/subcomponents of the UE  104  may define the means for determining that the one or more first UL TCI states of the first UL TCI codepoint are not configured for UL transmissions. 
     At  306 , the method  300  may include determining, in response to the one or more first UL TCI states not being configured, one or more second UL TCI states of a default UL TCI codepoint that are configured for the UL transmissions. For example, one or more of the processor  412 , the modem  144 , the UL configuration component  146 , and/or one or more components/subcomponents of the UE  104  may be configured to determine, in response to the one or more first UL TCI states not being configured, one or more second UL TCI states of a default UL TCI codepoint that are configured for the UL transmissions. Thus, the processor  412 , the modem  144 , the UL configuration component  146 , and/or one or more components/subcomponents of the UE  104  may define the means for determining, in response to the one or more first UL TCI states not being configured, one or more second UL TCI states of a default UL TCI codepoint that are configured for the UL transmissions. 
     At  308 , the method  300  may include transmitting, to the base station, the UL transmissions based on the one or more second UL TCI states. For example, one or more of the processor  412 , the transceiver  402 , the modem  144 , the UL configuration component  146 , and/or one or more components/subcomponents of the UE  104  may be configured to transmit, to the base station  102 , the UL transmissions based on the one or more second UL TCI states. Thus, the processor  412 , the transceiver  402 , the modem  144 , the UL configuration component  146 , and/or one or more components/subcomponents of the UE  104  may define the means for transmitting, to the base station  102 , the UL transmissions based on the one or more second UL TCI states. 
     Referring to  FIG. 4 , one example of an implementation of the UE  104  may include a variety of components, some of which have already been described above, but including components such as one or more processors  412 , memory  416 , and transceiver  402  in communication via one or more buses  444 , which may operate in conjunction with the modem  144  to enable one or more of the functions of the methods  200  and  300  described herein. The one or more processors  412 , modem  140 , memory  416 , the transceiver  402 , RF front end  488  and one or more antennas  465 , may be configured to support voice and/or data calls (simultaneously or non-simultaneously) in one or more radio access technologies. 
     In an aspect, the one or more processors  412  may include the modem  144  that uses one or more modem processors. The various functions related to the UL configuration component  146  may be included in the modem  144  and/or the processors  412  and, in an aspect, may be executed by a single processor, while in other aspects, different ones of the functions may be executed by a combination of two or more different processors. For example, in an aspect, the one or more processors  412  may include any one or any combination of a modem processor, or a baseband processor, or a digital signal processor, or a transmit processor, or a receiver processor, or a transceiver processor associated with the transceiver  402 . In other aspects, some of the features of the one or more processors  412  and/or the modem  144  may be performed by the transceiver  402 . 
     Also, the memory  416  may be configured to store data used herein and/or local versions of applications  475  or the UL configuration component  146  and/or one or more of its subcomponents being executed by the at least one processors  412 . The memory  416  may include any type of computer-readable medium usable by a computer or the at least one processor  412 , such as random access memory (RAM), read only memory (ROM), tapes, magnetic discs, optical discs, volatile memory, non-volatile memory, and any combination thereof. In an aspect, for example, the memory  416  may be a non-transitory computer-readable storage medium that stores one or more computer-executable codes defining the UL configuration component  146  and/or one or more of its subcomponents, and/or data associated therewith, when the UE  104  is operating the at least one processor  412  to execute the UL configuration component  146  and/or one or more of its subcomponents. 
     The transceiver  402  may include at least one receiver  406  and at least one transmitter  408 . The receiver  406  may include hardware, firmware, and/or software code executable by a processor for receiving data, the code comprising instructions and being stored in a memory (e.g., computer-readable medium). The receiver  406  may be, for example, a radio frequency (RF) receiver. In an aspect, the receiver  406  may receive signals transmitted by at least one of the base stations  102 . Additionally, the receiver  406  may process such received signals, and also may obtain measurements of the signals, such as, but not limited to, Ec/Io, SNR, RSRP, RSSI, etc. The transmitter  408  may include hardware, firmware, and/or software code executable by a processor for transmitting data, the code comprising instructions and being stored in a memory (e.g., computer-readable medium). A suitable example of the transmitter  408  may include, but is not limited to, an RF transmitter. The transceiver  402 , receiver  406 , and/or transmitter  408  may be configured to operate in mmW frequencies and/or near mmW frequencies. 
     Moreover, in an aspect, the UE  104  may include the RF front end  488 , which may operate in communication with one or more antennas  465  and the transceiver  402  for receiving and transmitting radio transmissions, for example, wireless communications transmitted by at least one of the base stations  102  or wireless transmissions transmitted by the UE  104 . The RF front end  488  may be connected to the one or more antennas  465  and may include one or more low-noise amplifiers (LNAs)  490 , one or more switches  492 , one or more power amplifiers (PAs)  498 , and one or more filters  496  for transmitting and receiving RF signals. 
     In an aspect, the LNA  490  may amplify a received signal at a desired output level. In an aspect, each of the LNAs  490  may have a specified minimum and maximum gain values. In an aspect, the RF front end  488  may use the one or more switches  492  to select a particular LNA  490  and its specified gain value based on a desired gain value for a particular application. 
     The one or more PA(s)  498  may be used by the RF front end  488  to amplify a signal for an RF output at a desired output power level. In an aspect, each of the PAs  498  may have specified minimum and maximum gain values. In an aspect, the RF front end  488  may use the one or more switches  492  to select a particular PA  498  and its specified gain value based on a desired gain value for a particular application. 
     Also, for example, the one or more filters  496  may be used by the RF front end  488  to filter a received signal to obtain an input RF signal. Similarly, in an aspect, for example, a respective filter  496  may be used to filter an output from a respective PA  498  to produce an output signal for transmission. In an aspect, each of the filters  496  may be connected to a specific LNA  490  and/or PA  498 . In an aspect, the RF front end  488  may use the one or more switches  492  to select a transmit or receive path using a specified filter  496 , LNA  490 , and/or PA  498 , based on a configuration as specified by the transceiver  402  and/or the processor  412 . 
     As such, the transceiver  402  may be configured to transmit and receive wireless signals through the one or more antennas  465  via the RF front end  488 . In an aspect, the transceiver  402  may be tuned to operate at specified frequencies such that the UE  104  may communicate with, for example, one or more of the base stations  102  or one or more cells associated with one or more of the base stations  102 . In an aspect, for example, the modem  144  may configure the transceiver  402  to operate at a specified frequency and power level based on the UE configuration of the UE  104  and the communication protocol used by the modem  144 . 
     In an aspect, the modem  144  may be a multiband-multimode modem, which may process digital data and communicate with the transceiver  402  such that the digital data is sent and received using the transceiver  402 . In an aspect, the modem  144  may be multiband and be configured to support multiple frequency bands for a specific communications protocol. In an aspect, the modem  144  may be multimode and be configured to support multiple operating networks and communications protocols. In an aspect, the modem  144  may control one or more components of the UE  104  (e.g., RF front end  488 , transceiver  402 ) to enable transmission and/or reception of signals from the network based on a specified modem configuration. In an aspect, the modem configuration may be based on the mode of the modem  144  and the frequency band in use. In another aspect, the modem configuration may be based on UE configuration information associated with the UE  104  as provided by the network during cell selection and/or cell reselection. 
     Referring to  FIGS. 5 and 6 , example methods  500  and  600  of wireless communications are disclosed. The methods  500  and  600  may be performed by the base station  102  of  FIG. 1  along with any of the components (see e.g.,  FIG. 7 ) of the base station  102 . For example, the methods  500  and  600  may be performed by one or more of the a processor  712 , a transceiver  702 , the modem  140 , the TCI signaling component  142 , and/or one or more additional components/subcomponents of the base station  102 . 
     Turning to  FIG. 5 , at  502 , the method  500  may optionally include receiving, from a UE, an indication of the one or more capabilities of the UE. For example, one or more of the processor  712 , the transceiver  702 , the modem  140 , the TCI signaling component  142  and/or one or more components/subcomponents of the base station  102  may be configured to receive, from the UE  104 , an indication of the one or more capabilities of the UE  104 . Thus, the processor  712 , the transceiver  702 , the modem  140 , the TCI signaling component  142 , and/or one or more components/subcomponents of the base station  102  may define the means for receiving, from the UE  104 , an indication of the one or more capabilities of the UE  104 . In an example, the one or more capabilities of the UE  104  may include, for example, capabilities of the UE  104  to support multiple transmissions from multiple panels of a base station  102  or capabilities of the UE  104  to support a switching time to activate transmissions between panels of the base station  102 . 
     At  504 , the method  500  may include determining one or more capabilities of a UE. For example, one or more of the processor  712 , the modem  140 , the TCI signaling component  142  and/or one or more components/subcomponents of the base station  102  may be configured to determine one or more capabilities of the UE  104 . Thus, the processor  712 , the modem  140 , the TCI signaling component  142 , and/or one or more components/subcomponents of the base station  102  may define the means for determining one or more capabilities of the UE  104 . In an example, the one or more capabilities of the UE  104  may be determined based on the received indication of the capabilities from the UE  104 . In another example, the one or more capabilities of the UE  104  may be determined based on stored data indicating the capabilities. 
     At  506 , the method  500  may also include determining one or more UL TCI states for the UE to use based on the one or more capabilities. For example, one or more of the processor  712 , the modem  140 , the TCI signaling component  142  and/or one or more components/subcomponents of the base station  102  may be configured to determine the one or more UL TCI states for the UE  104  to use based on the one or more capabilities. Thus, the processor  712 , the modem  140 , the TCI signaling component  142 , and/or one or more components/subcomponents of the base station  102  may define the means for determining the one or more UL TCI states for the UE  104  to use based on the one or more capabilities. In an example, the one or more UL TCI states may be based on one or more of an SDM scheme, an FDM scheme, or a TDM scheme. In an example, the base station  102  may determine one or more UL TCI states for the UE  104  based on capabilities of the UE  104  that allow mapping of multiple UL TCI states to a same codepoint. These capabilities may include, for example, the UE  104  supporting simultaneously transmitting (e.g., on UE  104  side) from multiple panels (e.g., as in SDM), the UE  104  supporting the timing of switching between different beams for back-to-back UL transmissions (e.g., as in TDM), or the UE  104  supporting multiple beams (e.g., TCI states) being transmitted simultaneously from the same panel but different resource blocks (RBs) (e.g., as in FDM). 
     At  508 , the method  500  may also include transmitting, to the UE, signaling of the one or more UL TCI states. For example, one or more of the processor  712 , the transceiver  702 , the modem  140 , the TCI signaling component  142  and/or one or more components/subcomponents of the base station  102  may be configured to transmit, to the UE  104 , the signaling of the one or more UL TCI states. Thus, the processor  712 , the transceiver  702 , the modem  140 , the TCI signaling component  142 , and/or one or more components/subcomponents of the base station  102  may define the means for transmitting, to the UE  104 , the signaling of the one or more UL TCI states. In an example, the signaling of the one or more UL TCI states is transmitted via one or more of a DCI signal, an MAC-CE signal, or an RRC signal. 
     At  510 , the method  500  may optionally include mapping the one or more UL TCI states to a codepoint of a signal that schedules one or more UL transmissions. For example, one or more of the processor  712 , the modem  140 , the TCI signaling component  142  and/or one or more components/subcomponents of the base station  102  may be configured to map the one or more UL TCI states to a codepoint of a signal that schedules one or more UL transmissions. Thus, the processor  712 , the transceiver  702 , the modem  140 , the TCI signaling component  142 , and/or one or more components/subcomponents of the base station  102  may define the means for mapping the one or more UL TCI states to a codepoint of a signal that schedules one or more UL transmissions. In an example, the codepoint may be a code, a string, or one or more bits of a DCI signal. 
     At  512 , the method  500  may include transmitting, to the UE, signaling indicating the codepoint. For example, one or more of the processor  712 , the transceiver  702 , the modem  140 , the TCI signaling component  142  and/or one or more components/subcomponents of the base station  102  may be configured to transmit, to the UE  104 , signaling indicating the codepoint. Thus, the processor  712 , the transceiver  702 , the modem  140 , the TCI signaling component  142 , and/or one or more components/subcomponents of the base station  102  may define the means for transmitting, to the UE  104 , signaling indicating the codepoint. 
     At  514 , the method  500  may optionally include receiving, from the UE, an UL transmission in response to the signaling, wherein the UL transmission is based on the one or more UL TCI states. For example, one or more of the processor  712 , the transceiver  702 , the modem  140 , the TCI signaling component  142  and/or one or more components/subcomponents of the base station  102  may be configured to receive, from the UE  104 , an UL transmission in response to the signaling, wherein the UL transmission is based on the one or more UL TCI states. Thus, the processor  712 , the transceiver  702 , the modem  140 , the TCI signaling component  142 , and/or one or more components/subcomponents of the base station  102  may define the means for receiving, from the UE  104 , an UL transmission in response to the signaling, wherein the UL transmission is based on the one or more UL TCI states. 
     Turning to  FIG. 6 , at  602 , the method  600  may include transmitting, to a UE, signaling indicating a first UL TCI codepoint mapped to one or more first UL TCI states. For example, one or more of the processor  712 , the transceiver  702 , the modem  140 , the TCI signaling component  142  and/or one or more components/subcomponents of the base station  102  may be configured to transmit, to the UE  104 , signaling indicating a first UL TCI codepoint mapped to one or more first UL TCI states. Thus, the processor  712 , the transceiver  702 , the modem  140 , the TCI signaling component  142 , and/or one or more components/subcomponents of the base station  102  may define the means for transmitting, to the UE  104 , signaling indicating a first UL TCI codepoint mapped to one or more first UL TCI states. In an example, the one or more UL TCI states may be based on one or more of an SDM scheme, an FDM scheme, or a TDM scheme. In an example, the codepoint is a code, a string, or one or more bits of a DCI signal. 
     At  604 , the method  600  may include receiving, from the UE in response to the transmitting the signaling, UL transmissions based on one or more second UL TCI states of a default UL TCI codepoint. For example, one or more of the processor  712 , the transceiver  702 , the modem  140 , the TCI signaling component  142  and/or one or more components/subcomponents of the base station  102  may be configured to receive, from the UE  104  in response to the transmitting the signaling, UL transmissions based on one or more second UL TCI states of a default UL TCI codepoint. Thus, the processor  712 , the transceiver  702 , the modem  140 , the TCI signaling component  142 , and/or one or more components/subcomponents of the base station  102  may define the means for receiving, from the UE  104  in response to the transmitting the signaling, UL transmissions based on one or more second UL TCI states of a default UL TCI codepoint. 
     At  606 , the method  600  may also include determining, based on the received UL transmissions, that the one or more first UL TCI states of the first codepoint were not configured for UL transmissions. For example, one or more of the processor  712 , the modem  140 , the TCI signaling component  142  and/or one or more components/subcomponents of the base station  102  may be configured to determine, based on the received UL transmissions, that the one or more first UL TCI states of the first codepoint were not configured for UL transmissions. Thus, the processor  712 , the modem  140 , the TCI signaling component  142 , and/or one or more components/subcomponents of the base station  102  may define the means for determining, based on the received UL transmissions, that the one or more first UL TCI states of the first codepoint were not configured for UL transmissions. In an example, the first UL TCI states may not have been configured for UL transmissions based on the one or more first UL TCI states not being ready in time for the UL transmissions. In an example, the first UL TCI states may not have been configured for UL transmissions based on the one or more first UL TCI states being received by the UE  104  within a time-domain scheduling threshold. 
     At  608 , the method  600  may also include storing an indication that the one or more first UL TCI states are not configured by the UE for the UL transmissions. For example, one or more of the processor  712 , the modem  140 , the TCI signaling component  142  and/or one or more components/subcomponents of the base station  102  may be configured to storing an indication that the one or more first UL TCI states are not configured by the UE  104  for the UL transmissions. Thus, the processor  712 , the modem  140 , the TCI signaling component  142 , and/or one or more components/subcomponents of the base station  102  may define the means for storing an indication that the one or more first UL TCI states are not configured by the UE  104  for the UL transmissions. 
     Referring to  FIG. 7 , one example of an implementation of base station  102  may include a variety of components, some of which have already been described above, but including components such as one or more processors  712 , memory  716  and transceiver  702  in communication via one or more buses  744 , which may operate in conjunction with modem  140  and the TCI signaling component  142  to enable one or more of the functions of the methods  500  and  600  described herein. 
     The transceiver  702 , receiver  706 , transmitter  708 , one or more processors  712 , memory  716 , applications  775 , buses  744 , RF front end  788 , LNAs  790 , switches  792 , filters  796 , PAs  798 , and one or more antennas  765  may be the same as or similar to the corresponding components of the UE  104 , as described above, but configured or otherwise programmed for base station operations as opposed to UE operations. 
     Some Further Example Embodiments 
     An example method of wireless communication by a UE, comprising: receiving, from a base station, signaling indicating one or more uplink transmission configuration indicator (TCI) states; configuring, based on the signaling indicating the one or more uplink TCI states, the one or more uplink TCI states to be used by the UE for uplink transmissions; and transmitting, to the base station, the uplink transmissions based on the one or more uplink TCI states. 
     The above example method, further comprising: receiving, from the base station, signaling indicating a codepoint that schedules one or more of the uplink transmissions. 
     One or more of the above example methods, wherein the codepoint is a code, a string, or one or more bits of a downlink configuration indicator (DCI). 
     One or more of the above example methods, further comprising: transmitting, to the base station, an indication of one or more capabilities of the UE, wherein the receiving the signaling is in response to the indication being transmitted. 
     One or more of the above example methods, wherein the signaling indicating the one or more uplink TCI states is indicated via a mapping of the one or more uplink TCI states to a single uplink TCI codepoint. 
     One or more of the above example methods, wherein the signaling indicating the one or more uplink TCI states is received via one or more of a downlink configuration indicator (DCI) signal, a media access control-control element (MAC-CE) signal, or a radio resource control (RRC) signal. 
     One or more of the above example methods, wherein the signaling indicates the one or more uplink TCI states via a mapping of the one or more uplink TCI states to a single composite multiple transmission and reception point (mTRP) uplink TCI state. 
     One or more of the above example methods, wherein the uplink transmissions are one or more of a sounding reference signal (SRS), a physical uplink control channel (PUCCH), a physical uplink shared channel (PUSCH), or a physical random access channel (PRACH). 
     One or more of the above example methods, wherein the one or more uplink TCI states are based on one or more of a space division multiplexing (SDM) scheme, a frequency division multiplexing (FDM) scheme, or a time division multiplexing (TDM) scheme. 
     One or more of the above example methods, wherein when the one or more uplink TCI states are based on the SDM scheme, the uplink transmissions are transmitted simultaneously in overlapped frequency resources. 
     One or more of the above example methods, wherein when the one or more uplink TCI states are based on the FDM scheme, the uplink transmissions are transmitted simultaneously in non-overlapped frequency resources. 
     One or more of the above example methods, wherein when the one or more uplink TCI states are based on the TDM scheme, the uplink transmissions are transmitted in different time resources. 
     An example apparatus for wireless communication, comprising: a memory storing instructions; and at least one processor communicatively coupled to the memory and configured to perform any of the above example methods. 
     An example computer-readable medium storing computer executable code, comprising code to: perform any of the above example methods. 
     Another example apparatus, comprising: means for performing any of the above example methods. 
     A second example method of wireless communication by a base station, comprising: determining one or more capabilities of a user equipment (UE); determining one or more uplink transmission configuration indicator (TCI) states for the UE to use based on the one or more capabilities; and transmitting, to the UE, signaling of the one or more uplink TCI states. 
     The above second example method, further comprising: mapping the one or more uplink TCI states to a codepoint of a signal that schedules one or more uplink transmissions; and transmitting, to the UE, signaling indicating the codepoint. 
     One or more of the above second example methods, wherein the codepoint is a code, a string, or one or more bits of a downlink configuration indicator (DCI). 
     One or more of the above second example methods, further comprising: receiving, from the UE, an indication of the one or more capabilities of the UE, wherein the determining the one or more capabilities of the UE is in response to receiving the indication. 
     One or more of the above second example methods, the determining the one or more capabilities of the UE is based on a stored setting. 
     One or more of the above second example methods, further comprising: receiving, from the UE, an uplink transmission in response to the signaling, wherein the uplink transmission is based on the one or more uplink TCI states. 
     One or more of the above second example methods, wherein the uplink transmission is one of a sounding reference signal (SRS), a physical uplink control channel (PUCCH), physical uplink shared channel (PUSCH), or physical random access channel (PRACH). 
     One or more of the above second example methods, wherein the signaling of the one or more uplink TCI states is transmitted via one or more of a downlink configuration indicator (DCI) signal, a media access control-control element (MAC-CE) signal, or a radio resource control (RRC) signal. 
     One or more of the above second example methods, wherein the one or more uplink TCI states are based on one or more of a space division multiplexing (SDM) scheme, a frequency division multiplexing (FDM) scheme, or a time division multiplexing (TDM) scheme. 
     An example apparatus for wireless communication, comprising: a memory storing instructions; and at least one processor communicatively coupled to the memory and configured to perform any of the above second example methods. 
     An example computer-readable medium storing computer executable code, comprising code to: perform any of the above second example methods. 
     Another example apparatus, comprising: means for performing any of the above second example methods. 
     A third example method of wireless communication by a user equipment (UE), comprising: receiving, from a base station, signaling indicating a first uplink transmission configuration indicator (TCI) codepoint mapped to one or more first uplink TCI states; determining that the one or more first uplink TCI states of the first uplink TCI codepoint are not configured for uplink transmissions; determining, in response to the one or more first uplink TCI states not being configured, one or more second uplink TCI states of a default uplink TCI codepoint that are configured for the uplink transmissions; and transmitting, to the base station, the uplink transmissions based on the one or more second uplink TCI states. 
     The above third example method, further comprising: determining an index of the default uplink TCI codepoint mapped to the one or more second uplink TCI states, wherein the index of the default uplink TCI codepoint is sequentially higher or lower than an index of the first uplink TCI codepoint mapped to the one or more first uplink TCI states, wherein the one or more second TCI states are determined based on the index of the default uplink TCI codepoint. 
     One or more of the above third example methods, further comprising: determining an index of the default uplink TCI codepoint mapped to the one or more second uplink TCI states, wherein the index of the default uplink TCI codepoint corresponds to a recently used uplink TCI codepoint, wherein the one or more second TCI states are determined based on the index of the default uplink TCI codepoint. 
     An example apparatus for wireless communication, comprising: a memory storing instructions; and at least one processor communicatively coupled to the memory and configured to perform any of the above third example methods. 
     An example computer-readable medium storing computer executable code, comprising code to: perform any of the above third example methods. 
     Another example apparatus, comprising: means for performing any of the above third example methods. 
     A fourth example method of wireless communication by a base station, comprising: transmitting, to a user equipment (UE), signaling indicating a first uplink transmission configuration indicator (TCI) codepoint mapped to one or more first uplink TCI states; receiving, from the UE in response to the transmitting the signaling, uplink transmissions based on one or more second uplink TCI states of a default uplink TCI codepoint; determining, based on the received uplink transmissions, that the one or more first uplink TCI states of the first codepoint were not configured for uplink transmissions; and storing an indication that the one or more first UL TCI states are not configured by the UE for the UL transmissions. 
     An example apparatus for wireless communication, comprising: a memory storing instructions; and at least one processor communicatively coupled to the memory and configured to perform the above fourth example method. 
     An example computer-readable medium storing computer executable code, comprising code to: perform the above fourth example method. 
     Another example apparatus, comprising: means for performing the above fourth example method. 
     The above detailed description set forth above in connection with the appended drawings describes examples and does not represent the only examples that may be implemented or that are within the scope of the claims. The term “example,” when used in this description, means “serving as an example, instance, or illustration,” and not “preferred” or “advantageous over other examples.” The detailed description includes specific details for the purpose of providing an understanding of the described techniques. These techniques, however, may be practiced without these specific details. In some instances, well-known structures and apparatuses are shown in block diagram form in order to avoid obscuring the concepts of the described examples. 
     Information and signals may be represented using any of a variety of different technologies and techniques. For example, data, instructions, commands, information, signals, bits, symbols, and chips that may be referenced throughout the above description may be represented by voltages, currents, electromagnetic waves, magnetic fields or particles, optical fields or particles, computer-executable code or instructions stored on a computer-readable medium, or any combination thereof. 
     The various illustrative blocks and components described in connection with the disclosure herein may be implemented or performed with a specially-programmed device, such as but not limited to a processor, a digital signal processor (DSP), an ASIC, a FPGA or other programmable logic device, a discrete gate or transistor logic, a discrete hardware component, or any combination thereof designed to perform the functions described herein. A specially-programmed processor may be a microprocessor, but in the alternative, the processor may be any conventional processor, controller, microcontroller, or state machine. A specially-programmed processor may also be implemented as a combination of computing devices, e.g., a combination of a DSP and a microprocessor, multiple microprocessors, one or more microprocessors in conjunction with a DSP core, or any other such configuration. 
     The functions described herein may be implemented in hardware, software executed by a processor, firmware, or any combination thereof. If implemented in software executed by a processor, the functions may be stored on or transmitted over as one or more instructions or code on a non-transitory computer-readable medium. Other examples and implementations are within the scope and spirit of the disclosure and appended claims. For example, due to the nature of software, functions described above may be implemented using software executed by a specially programmed processor, hardware, firmware, hardwiring, or combinations of any of these. Features implementing functions may also be physically located at various positions, including being distributed such that portions of functions are implemented at different physical locations. Also, as used herein, including in the claims, “or” as used in a list of items prefaced by “at least one of” indicates a disjunctive list such that, for example, a list of “at least one of A, B, or C” means A or B or C or AB or AC or BC or ABC (i.e., A and B and C). 
     Computer-readable media includes both computer storage media and communication media including any medium that facilitates transfer of a computer program from one place to another. A storage medium may be any available medium that may be accessed by a general purpose or special purpose computer. By way of example, and not limitation, computer-readable media may comprise RAM, ROM, EEPROM, CD-ROM or other optical disk storage, magnetic disk storage or other magnetic storage devices, or any other medium that may be used to carry or store desired program code means in the form of instructions or data structures and that may be accessed by a general-purpose or special-purpose computer, or a general-purpose or special-purpose processor. Also, any connection is properly termed a computer-readable medium. For example, if the software is transmitted from a website, server, or other remote source using a coaxial cable, fiber optic cable, twisted pair, digital subscriber line (DSL), or wireless technologies such as infrared, radio, and microwave, then the coaxial cable, fiber optic cable, twisted pair, DSL, or wireless technologies such as infrared, radio, and microwave are included in the definition of medium. Disk and disc, as used herein, include compact disc (CD), laser disc, optical disc, digital versatile disc (DVD), floppy disk and Blu-ray disc where disks usually reproduce data magnetically, while discs reproduce data optically with lasers. Combinations of the above are also included within the scope of computer-readable media. 
     The previous description of the disclosure is provided to enable a person skilled in the art to make or use the disclosure. Various modifications to the disclosure will be readily apparent to those skilled in the art, and the common principles defined herein may be applied to other variations without departing from the spirit or scope of the disclosure. Furthermore, although elements of the described aspects and/or embodiments may be described or claimed in the singular, the plural is contemplated unless limitation to the singular is explicitly stated. Additionally, all or a portion of any aspect and/or embodiment may be utilized with all or a portion of any other aspect and/or embodiment, unless stated otherwise. Thus, the disclosure is not to be limited to the examples and designs described herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.