Patent Publication Number: US-2023141830-A1

Title: Reference signal protection in a full-duplex mode

Description:
TECHNICAL FIELD 
     The present disclosure relates generally to communication systems, and more particularly, to wireless communication including full-duplex communication. 
     INTRODUCTION 
     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 5G New Radio (NR). 5G NR is 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 includes services associated with enhanced mobile broadband (eMBB), massive machine type communications (mMTC), and ultra-reliable low latency communications (URLLC). Some aspects of 5G NR may be based on the 4G Long Term Evolution (LTE) standard. There exists a need for further improvements in 5G NR technology. These improvements may also be applicable to other multi-access technologies and the telecommunication standards that employ these technologies. 
     BRIEF 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 of the disclosure, a method, a computer-readable medium, and an apparatus for wireless communication at a user equipment (UE) are provided. The apparatus receives a configuration for one or more downlink reference signal or downlink channel from a base station and receives an indication of one or more time and frequency resources for full-duplex communication at the base station. The apparatus skips reception of the one or more downlink reference signal or downlink channel based at least in part on the indication of the one or more time and frequency resources for the full-duplex communication at the base station. 
     In an aspect of the disclosure, a method, a computer-readable medium, and an apparatus for wireless communication at a UE are provided. The apparatus receives, from a base station, an allocation of uplink resources for an uplink transmission and receives an indication of one or more time and frequency resources for full-duplex communication at the base station. The apparatus transmits the uplink transmission to avoid the one or more time and frequency resources for the full-duplex communication at the base station. 
     In an aspect of the disclosure, a method, a computer-readable medium, and an apparatus for wireless communication at a base station are provided. The apparatus schedules full duplex communication including one or more downlink reference signal or downlink channel from the base station and an allocation of uplink resources for an uplink transmission to the base station based on cross link interference (CLI) to a reception of the one or more downlink reference signal or downlink channel at a first UE and transmits the one or more downlink reference signal or downlink channel. 
     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 
         FIG.  1    is a diagram illustrating an example of a wireless communications system and an access network, in accordance with various aspects of the present disclosure. 
         FIG.  2 A  is a diagram illustrating an example of a first frame, in accordance with various aspects of the present disclosure. 
         FIG.  2 B  is a diagram illustrating an example of DL channels within a subframe, in accordance with various aspects of the present disclosure. 
         FIG.  2 C  is a diagram illustrating an example of a second frame, in accordance with various aspects of the present disclosure. 
         FIG.  2 D  is a diagram illustrating an example of UL channels within a subframe, in accordance with various aspects of the present disclosure. 
         FIG.  3    is a diagram illustrating an example of a base station and user equipment (UE) in an access network, in accordance with various aspects of the present disclosure. 
         FIG.  4 A  shows a first example of full-duplex communication in which a first base station is in full duplex communication with a first UE and a second UE, in accordance with various aspects of the present disclosure. 
         FIG.  4 B  shows a second example of full-duplex communication in which a first base station is in full-duplex communication with a first UE, in accordance with various aspects of the present disclosure. 
         FIG.  4 C  shows a third example of full-duplex communication in which a first UE is a full-duplex UE in communication with a first base station and a second base station, in accordance with various aspects of the present disclosure. 
         FIG.  5    illustrates example aspects of full-duplex resources, in accordance with various aspects of the present disclosure. 
         FIGS.  6 A,  6 B, and  6 C  include diagrams showing different scenarios for full-duplex communication, in accordance with various aspects of the present disclosure. 
         FIG.  7    is a communication between a base station and a UE that includes protecting a downlink reception from cross-link interference, in accordance with various aspects of the present disclosure. 
         FIG.  8    is a communication between a base station and a UE that includes protecting a downlink reception from cross-link interference, in accordance with various aspects of the present disclosure. 
         FIG.  9 A  is a communication between a base station and a UE that includes protecting a downlink reception from cross-link interference, in accordance with various aspects of the present disclosure. 
         FIG.  9 B  illustrates a resource diagram including resources for a downlink transmission to be protected from CLI, in accordance with various aspects of the present disclosure. 
         FIGS.  10 A and  10 B  are flowcharts of methods of wireless communication, in accordance with various aspects of the present disclosure. 
         FIG.  11    is a flowchart of a method of wireless communication, in accordance with various aspects of the present disclosure. 
         FIG.  12    is a diagram illustrating an example of a hardware implementation for an example apparatus, in accordance with various aspects of the present disclosure. 
         FIGS.  13 A and  13 B  are flowcharts of methods of wireless communication, in accordance with various aspects of the present disclosure. 
         FIG.  14    is a diagram illustrating an example of a hardware implementation for an example apparatus, in accordance with various 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 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. 
     While aspects and implementations are described in this application by illustration to some examples, those skilled in the art will understand that additional implementations and use cases may come about in many different arrangements and scenarios. Innovations described herein may be implemented across many differing platform types, devices, systems, shapes, sizes, and packaging arrangements. For example, implementations and/or uses may come about via integrated chip implementations and other non-module-component based devices (e.g., end-user devices, vehicles, communication devices, computing devices, industrial equipment, retail/purchasing devices, medical devices, artificial intelligence (AI)-enabled devices, etc.). While some examples may or may not be specifically directed to use cases or applications, a wide assortment of applicability of described innovations may occur. Implementations may range a spectrum from chip-level or modular components to non-modular, non-chip-level implementations and further to aggregate, distributed, or original equipment manufacturer (OEM) devices or systems incorporating one or more aspects of the described innovations. In some practical settings, devices incorporating described aspects and features may also include additional components and features for implementation and practice of claimed and described aspect. For example, transmission and reception of wireless signals necessarily includes a number of components for analog and digital purposes (e.g., hardware components including antenna, RF-chains, power amplifiers, modulators, buffer, processor(s), interleaver, adders/summers, etc.). It is intended that innovations described herein may be practiced in a wide variety of devices, chip-level components, systems, distributed arrangements, aggregated or disaggregated components, end-user devices, etc. of varying sizes, shapes, and constitution. 
       FIG.  1    is a diagram illustrating an example of a wireless communications system and an access network  100 . 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 another core network  190  (e.g., a 5G Core (5GC)). The base stations  102  may include macrocells (high power cellular base station) and/or small cells (low power cellular base station). The macrocells 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 first backhaul links  132  (e.g., S1 interface). The base stations  102  configured for 5G NR (collectively referred to as Next Generation RAN (NG-RAN)) may interface with core network  190  through second 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 core network  190 ) with each other over third backhaul links  134  (e.g., X2 interface). The first backhaul links  132 , the second backhaul links  184  (Xn interface), and the third backhaul links  134  may be wired or wireless. 
     In some aspects, a base station  102  or  180  may be referred as a RAN and may include aggregated or disaggregated components. As an example of a disaggregated RAN, a base station may include a central unit (CU)  106 , one or more distributed units (DU)  105 , and/or one or more remote units (RU)  109 , as illustrated in  FIG.  1   . A RAN may be disaggregated with a split between an RU  109  and an aggregated CU/DU. A RAN may be disaggregated with a split between the CU  106 , the DU  105 , and the RU  109 . A RAN may be disaggregated with a split between the CU  106  and an aggregated DU/RU. The CU  106  and the one or more DUs  105  may be connected via an F1 interface. A DU  105  and an RU  109  may be connected via a fronthaul interface. A connection between the CU  106  and a DU  105  may be referred to as a midhaul, and a connection between a DU  105  and an RU  109  may be referred to as a fronthaul. The connection between the CU  106  and the core network may be referred to as the backhaul. The RAN may be based on a functional split between various components of the RAN, e.g., between the CU  106 , the DU  105 , or the RU  109 . The CU may be configured to perform one or more aspects of a wireless communication protocol, e.g., handling one or more layers of a protocol stack, and the DU(s) may be configured to handle other aspects of the wireless communication protocol, e.g., other layers of the protocol stack. In different implementations, the split between the layers handled by the CU and the layers handled by the DU may occur at different layers of a protocol stack. As one, non-limiting example, a DU  105  may provide a logical node to host a radio link control (RLC) layer, a medium access control (MAC) layer, and at least a portion of a physical (PHY) layer based on the functional split. An RU may provide a logical node configured to host at least a portion of the PHY layer and radio frequency (RF) processing. A CU  106  may host higher layer functions, e.g., above the RLC layer, such as a service data adaptation protocol (SDAP) layer, a packet data convergence protocol (PDCP) layer. In other implementations, the split between the layer functions provided by the CU, DU, or RU may be different. 
     An access network may include one or more integrated access and backhaul (IAB) nodes  111  that exchange wireless communication with a UE  104  or other IAB node  111  to provide access and backhaul to a core network. In an IAB network of multiple IAB nodes, an anchor node may be referred to as an IAB donor. The IAB donor may be a base station  102  or  180  that provides access to a core network  190  or EPC  160  and/or control to one or more IAB nodes  111 . The IAB donor may include a CU  106  and a DU  105 . IAB nodes  111  may include a DU  105  and a mobile termination (MT). The DU  105  of an IAB node  111  may operate as a parent node, and the MT may operate as a child node. 
     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 macrocells 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 uplink (UL) (also referred to as reverse link) transmissions from a UE  104  to a base station  102  and/or downlink (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 fewer 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, WiMedia, Bluetooth, ZigBee, Wi-Fi based on the Institute of Electrical and Electronics Engineers (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 , e.g., in a 5 GHz unlicensed frequency spectrum or the like. 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 unlicensed frequency spectrum (e.g., 5 GHz, or the like) 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. 
     The electromagnetic spectrum is often subdivided, based on frequency/wavelength, into various classes, bands, channels, etc. In 5G NR, two initial operating bands have been identified as frequency range designations FR1 (410 MHz-7.125 GHz) and FR2 (24.25 GHz-52.6 GHz). Although a portion of FR1 is greater than 6 GHz, FR1 is often referred to (interchangeably) as a “sub-6 GHz” band in various documents and articles. A similar nomenclature issue sometimes occurs with regard to FR2, which is often referred to (interchangeably) as a “millimeter wave” band in documents and articles, despite being different from the extremely high frequency (EHF) band (30 GHz-300 GHz) which is identified by the International Telecommunications Union (ITU) as a “millimeter wave” band. 
     The frequencies between FR1 and FR2 are often referred to as mid-band frequencies. Recent 5G NR studies have identified an operating band for these mid-band frequencies as frequency range designation FR3 (7.125 GHz-24.25 GHz). Frequency bands falling within FR3 may inherit FR1 characteristics and/or FR2 characteristics, and thus may effectively extend features of FR1 and/or FR2 into mid-band frequencies. In addition, higher frequency bands are currently being explored to extend 5G NR operation beyond 52.6 GHz. For example, three higher operating bands have been identified as frequency range designations FR2-2 (52.6 GHz-71 GHz), FR4 (71 GHz-114.25 GHz), and FR5 (114.25 GHz-300 GHz). Each of these higher frequency bands falls within the EHF band. 
     With the above aspects in mind, unless specifically stated otherwise, it should be understood that the term “sub-6 GHz” or the like if used herein may broadly represent frequencies that may be less than 6 GHz, may be within FR1, or may include mid-band frequencies. Further, unless specifically stated otherwise, it should be understood that the term “millimeter wave” or the like if used herein may broadly represent frequencies that may include mid-band frequencies, may be within FR2, FR4, FR2-2, and/or FR5, or may be within the EHF band. 
     A base station  102 , whether a small cell  102 ′ or a large cell (e.g., macro base station), may include and/or be referred to as an eNB, gNodeB (gNB), or another type of base station. Some base stations, such as gNB  180  may operate in a traditional sub 6 GHz spectrum, in millimeter wave frequencies, and/or near millimeter wave frequencies in communication with the UE  104 . When the gNB  180  operates in millimeter wave or near millimeter wave frequencies, the gNB  180  may be referred to as a millimeter wave base station. The millimeter wave base station  180  may utilize beamforming  182  with the UE  104  to compensate for the path loss and short range. The base station  180  and the UE  104  may each include a plurality of antennas, such as antenna elements, antenna panels, and/or antenna arrays to facilitate the beamforming. 
     The base station  180  may transmit a beamformed signal to the UE  104  in one or more transmit directions  182 ′. The UE  104  may receive the beamformed signal from the base station  180  in one or more receive directions  182 ″. The UE  104  may also transmit a beamformed signal to the base station  180  in one or more transmit directions. The base station  180  may receive the beamformed signal from the UE  104  in one or more receive directions. The base station  180 /UE  104  may perform beam training to determine the best receive and transmit directions for each of the base station  180 /UE  104 . The transmit and receive directions for the base station  180  may or may not be the same. The transmit and receive directions for the UE  104  may or may not be the same. 
     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 core network  190  may include an 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 core network  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 Packet Switch (PS) Streaming (PSS) Service, and/or other IP services. 
     The base station may include and/or be referred to as a gNB, 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 core network  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. In some scenarios, the term UE may also apply to one or more companion devices such as in a device constellation arrangement. One or more of these devices may collectively access the network and/or individually access the network. 
     Referring again to  FIG.  1   , in certain aspects, the UE  104  may include a CLI avoidance component  198  that is configured to receive a configuration for one or more downlink reference signal or downlink channel from a base station  102  or  180  and receive an indication of one or more time and frequency resources for full-duplex communication at the base station  102  or  180 . The CLI avoidance component  198  may be configured to skip reception of the one or more downlink reference signal or downlink channel based at least in part on the indication of the one or more time and frequency resources for the full-duplex communication at the base station  102  or  180 . In some aspects, the CLI avoidance component  198  may be configured to receive, from a base station  102  or  180 , an allocation of uplink resources for an uplink transmission and receives an indication of one or more time and frequency resources for full-duplex communication at the base station  102  or  180 . The CLI avoidance component  198  may be configured to transmit the uplink transmission to avoid the one or more time and frequency resources for the full-duplex communication at the base station  102  or  180 . 
     In some aspects, a base station  102  or  180  may include a full-duplex component  199  configured to schedule full duplex communication including one or more downlink reference signal or downlink channel from the base station and an allocation of uplink resources for an uplink transmission to the base station based on CLI to a reception of the one or more downlink reference signal or downlink channel at a first UE. The base station  102  or  180  may be configured to transmit the one or more downlink reference signal or downlink channel, e.g., to a UE  104 . 
     Although the following description may be focused on 5G NR, the concepts described herein may be applicable to other similar areas, such as LTE, LTE-A, CDMA, GSM, and other wireless technologies. 
       FIG.  2 A  is a diagram  200  illustrating an example of a first subframe within a 5G NR frame structure.  FIG.  2 B  is a diagram  230  illustrating an example of DL channels within a 5G NR subframe.  FIG.  2 C  is a diagram  250  illustrating an example of a second subframe within a 5G NR frame structure.  FIG.  2 D  is a diagram  280  illustrating an example of UL channels within a 5G NR subframe. The 5G NR frame structure may be frequency division duplexed (FDD) in which for a particular set of subcarriers (carrier system bandwidth), subframes within the set of subcarriers are dedicated for either DL or UL, or may be time division duplexed (TDD) in which for a particular set of subcarriers (carrier system bandwidth), subframes within the set of subcarriers are dedicated for both DL and UL. In the examples provided by  FIGS.  2 A,  2 C , the 5G NR frame structure is assumed to be TDD, with subframe 4 being configured with slot format 28 (with mostly DL), where D is DL, U is UL, and F is flexible for use between DL/UL, and subframe 3 being configured with slot format 1 (with all UL). While subframes 3, 4 are shown with slot formats 1, 28, respectively, any particular subframe may be configured with any of the various available slot formats 0-61. Slot formats 0, 1 are all DL, UL, respectively. Other slot formats 2-61 include a mix of DL, UL, and flexible symbols. UEs are configured with the slot format (dynamically through DL control information (DCI), or semi-statically/statically through radio resource control (RRC) signaling) through a received slot format indicator (SFI). Note that the description infra applies also to a 5G NR frame structure that is TDD. 
       FIGS.  2 A- 2 D  illustrate a frame structure, and the aspects of the present disclosure may be applicable to other wireless communication technologies, which may have a different frame structure and/or different channels. A frame (10 ms) may be divided into 10 equally sized subframes (1 ms). Each subframe may include one or more time slots. Subframes may also include mini-slots, which may include 7, 4, or 2 symbols. Each slot may include 14 or 12 symbols, depending on whether the cyclic prefix (CP) is normal or extended. For normal CP, each slot may include 14 symbols, and for extended CP, each slot may include 12 symbols. The symbols on DL may be CP orthogonal frequency division multiplexing (OFDM) (CP-OFDM) symbols. The symbols on UL may be CP-OFDM symbols (for high throughput scenarios) or discrete Fourier transform (DFT) spread OFDM (DFT-s-OFDM) symbols (also referred to as single carrier frequency-division multiple access (SC-FDMA) symbols) (for power limited scenarios; limited to a single stream transmission). The number of slots within a subframe is based on the CP and the numerology. The numerology defines the subcarrier spacing (SCS) and, effectively, the symbol length/duration, which is equal to 1/SCS. 
     
       
         
           
               
               
               
               
             
               
                   
                   
               
               
                   
                   
                 SCS 
                   
               
               
                   
                 μ 
                 Δf = 2 μ  · 15[kHz] 
                 Cyclic prefix 
               
               
                   
                   
               
             
            
               
                   
               
            
           
           
               
               
               
               
            
               
                   
                 0 
                 15 
                 Normal 
               
               
                   
                 1 
                 30 
                 Normal 
               
               
                   
                 2 
                 60 
                 Normal, 
               
               
                   
                   
                   
                 Extended 
               
               
                   
                 3 
                 120 
                 Normal 
               
               
                   
                 4 
                 240 
                 Normal 
               
               
                   
                   
               
            
           
         
       
     
     For normal CP (14 symbols/slot), different numerologies μ 0 to 4 allow for 1, 2, 4, 8, and 16 slots, respectively, per subframe. For extended CP, the numerology 2 allows for 4 slots per subframe. Accordingly, for normal CP and numerology μ, there are 14 symbols/slot and 2 μ  slots/subframe. The subcarrier spacing may be equal to 2 μ *15 kHz, where μ is the numerology 0 to 4. As such, the numerology μ=0 has a subcarrier spacing of 15 kHz and the numerology μ=4 has a subcarrier spacing of 240 kHz. The symbol length/duration is inversely related to the subcarrier spacing.  FIGS.  2 A- 2 D  provide an example of normal CP with 14 symbols per slot and numerology μ=2 with 4 slots per subframe. The slot duration is 0.25 ms, the subcarrier spacing is 60 kHz, and the symbol duration is approximately 16.67 μs. Within a set of frames, there may be one or more different bandwidth parts (BWPs) (see  FIG.  2 B ) that are frequency division multiplexed. Each BWP may have a particular numerology and CP (normal or extended). 
     A resource grid may be used to represent the frame structure. Each time slot includes a resource block (RB) (also referred to as physical RBs (PRBs)) that extends 12 consecutive subcarriers. The resource grid is divided into multiple resource elements (REs). The number of bits carried by each RE depends on the modulation scheme. 
     As illustrated in  FIG.  2 A , some of the REs carry reference (pilot) signals (RS) for the UE. The RS may include demodulation RS (DM-RS) (indicated as R for one particular configuration, but other DM-RS configurations are possible) and channel state information reference signals (CSI-RS) for channel estimation at the UE. The RS may also include beam measurement RS (BRS), beam refinement RS (BRRS), and phase tracking RS (PT-RS). 
       FIG.  2 B  illustrates an example of various DL channels within a subframe of a frame. The physical downlink control channel (PDCCH) carries DCI within one or more control channel elements (CCEs) (e.g., 1, 2, 4, 8, or 16 CCEs), each CCE including six RE groups (REGs), each REG including 12 consecutive REs in an OFDM symbol of an RB. A PDCCH within one BWP may be referred to as a control resource set (CORESET). A UE is configured to monitor PDCCH candidates in a PDCCH search space (e.g., common search space, UE-specific search space) during PDCCH monitoring occasions on the CORESET, where the PDCCH candidates have different DCI formats and different aggregation levels. Additional BWPs may be located at greater and/or lower frequencies across the channel bandwidth. A primary synchronization signal (PSS) may be within symbol 2 of particular subframes of a frame. The PSS is used by a UE  104  to determine subframe/symbol timing and a physical layer identity. A secondary synchronization signal (SSS) may be within symbol 4 of particular subframes of a frame. The SSS is used by a UE to determine a physical layer cell identity group number and radio frame timing. Based on the physical layer identity and the physical layer cell identity group number, the UE can determine a physical cell identifier (PCI). Based on the PCI, the UE can determine the locations of the DM-RS. The physical broadcast channel (PBCH), which carries a master information block (MIB), may be logically grouped with the PSS and SSS to form a synchronization signal (SS)/PBCH block (also referred to as SS block (SSB)). The MIB provides a number of RBs in the system bandwidth and a system frame number (SFN). The physical downlink shared channel (PDSCH) carries user data, broadcast system information not transmitted through the PBCH such as system information blocks (SIBs), and paging messages. 
     As illustrated in  FIG.  2 C , some of the REs carry DM-RS (indicated as R for one particular configuration, but other DM-RS configurations are possible) for channel estimation at the base station. The UE may transmit DM-RS for the physical uplink control channel (PUCCH) and DM-RS for the physical uplink shared channel (PUSCH). The PUSCH DM-RS may be transmitted in the first one or two symbols of the PUSCH. The PUCCH DM-RS may be transmitted in different configurations depending on whether short or long PUCCHs are transmitted and depending on the particular PUCCH format used. The UE may transmit sounding reference signals (SRS). The SRS may be transmitted in the last symbol of a subframe. The SRS may have a comb structure, and a UE may transmit SRS on one of the combs. The SRS may be used by a base station for channel quality estimation to enable frequency-dependent scheduling on the UL. 
       FIG.  2 D  illustrates an example of various UL channels within a subframe of a frame. The PUCCH may be located as indicated in one configuration. The PUCCH carries uplink control information (UCI), such as scheduling requests, a channel quality indicator (CQI), a precoding matrix indicator (PMI), a rank indicator (RI), and hybrid automatic repeat request (HARQ) acknowledgment (ACK) (HARQ-ACK) feedback (i.e., one or more HARQ ACK bits indicating one or more ACK and/or negative ACK (NACK)). The PUSCH carries data, and may additionally be used to carry a buffer status report (BSR), a power headroom report (PHR), and/or UCI. 
       FIG.  3    is a block diagram of a base station  310  in communication with a UE  350  in an access network. In the DL, IP packets from the EPC  160  may be provided to a controller/processor  375 . The controller/processor  375  implements layer 3 and layer 2 functionality. Layer 3 includes a radio resource control (RRC) layer, and layer 2 includes a service data adaptation protocol (SDAP) layer, a packet data convergence protocol (PDCP) layer, a radio link control (RLC) layer, and a medium access control (MAC) layer. The controller/processor  375  provides RRC layer functionality associated with broadcasting of system information (e.g., MIB, SIBs), RRC connection control (e.g., RRC connection paging, RRC connection establishment, RRC connection modification, and RRC connection release), inter radio access technology (RAT) mobility, and measurement configuration for UE measurement reporting; PDCP layer functionality associated with header compression/decompression, security (ciphering, deciphering, integrity protection, integrity verification), and handover support functions; RLC layer functionality associated with the transfer of upper layer packet data units (PDUs), error correction through ARQ, concatenation, segmentation, and reassembly of RLC service data units (SDUs), re-segmentation of RLC data PDUs, and reordering of RLC data PDUs; and MAC layer functionality associated with mapping between logical channels and transport channels, multiplexing of MAC SDUs onto transport blocks (TBs), demultiplexing of MAC SDUs from TBs, scheduling information reporting, error correction through HARQ, priority handling, and logical channel prioritization. 
     The transmit (TX) processor  316  and the receive (RX) processor  370  implement layer 1 functionality associated with various signal processing functions. Layer 1, which includes a physical (PHY) layer, may include error detection on the transport channels, forward error correction (FEC) coding/decoding of the transport channels, interleaving, rate matching, mapping onto physical channels, modulation/demodulation of physical channels, and MIMO antenna processing. The TX processor  316  handles mapping to signal constellations based on various modulation schemes (e.g., binary phase-shift keying (BPSK), quadrature phase-shift keying (QPSK), M-phase-shift keying (M-PSK), M-quadrature amplitude modulation (M-QAM)). The coded and modulated symbols may then be split into parallel streams. Each stream may then be mapped to an OFDM subcarrier, multiplexed with a reference signal (e.g., pilot) in the time and/or frequency domain, and then combined together using an Inverse Fast Fourier Transform (IFFT) to produce a physical channel carrying a time domain OFDM symbol stream. The OFDM stream is spatially precoded to produce multiple spatial streams. Channel estimates from a channel estimator  374  may be used to determine the coding and modulation scheme, as well as for spatial processing. The channel estimate may be derived from a reference signal and/or channel condition feedback transmitted by the UE  350 . Each spatial stream may then be provided to a different antenna  320  via a separate transmitter  318  TX. Each transmitter  318  TX may modulate a radio frequency (RF) carrier with a respective spatial stream for transmission. 
     At the UE  350 , each receiver  354  RX receives a signal through its respective antenna  352 . Each receiver  354  RX recovers information modulated onto an RF carrier and provides the information to the receive (RX) processor  356 . The TX processor  368  and the RX processor  356  implement layer 1 functionality associated with various signal processing functions. The RX processor  356  may perform spatial processing on the information to recover any spatial streams destined for the UE  350 . If multiple spatial streams are destined for the UE  350 , they may be combined by the RX processor  356  into a single OFDM symbol stream. The RX processor  356  then converts the OFDM symbol stream from the time-domain to the frequency domain using a Fast Fourier Transform (FFT). The frequency domain signal comprises a separate OFDM symbol stream for each subcarrier of the OFDM signal. The symbols on each subcarrier, and the reference signal, are recovered and demodulated by determining the most likely signal constellation points transmitted by the base station  310 . These soft decisions may be based on channel estimates computed by the channel estimator  358 . The soft decisions are then decoded and deinterleaved to recover the data and control signals that were originally transmitted by the base station  310  on the physical channel. The data and control signals are then provided to the controller/processor  359 , which implements layer 3 and layer 2 functionality. 
     The controller/processor  359  can be associated with a memory  360  that stores program codes and data. The memory  360  may be referred to as a computer-readable medium. In the UL, the controller/processor  359  provides demultiplexing between transport and logical channels, packet reassembly, deciphering, header decompression, and control signal processing to recover IP packets from the EPC  160 . The controller/processor  359  is also responsible for error detection using an ACK and/or NACK protocol to support HARQ operations. 
     Similar to the functionality described in connection with the DL transmission by the base station  310 , the controller/processor  359  provides RRC layer functionality associated with system information (e.g., MIB, SIBs) acquisition, RRC connections, and measurement reporting; PDCP layer functionality associated with header compression/decompression, and security (ciphering, deciphering, integrity protection, integrity verification); RLC layer functionality associated with the transfer of upper layer PDUs, error correction through ARQ, concatenation, segmentation, and reassembly of RLC SDUs, re-segmentation of RLC data PDUs, and reordering of RLC data PDUs; and MAC layer functionality associated with mapping between logical channels and transport channels, multiplexing of MAC SDUs onto TBs, demultiplexing of MAC SDUs from TBs, scheduling information reporting, error correction through HARQ, priority handling, and logical channel prioritization. 
     Channel estimates derived by a channel estimator  358  from a reference signal or feedback transmitted by the base station  310  may be used by the TX processor  368  to select the appropriate coding and modulation schemes, and to facilitate spatial processing. The spatial streams generated by the TX processor  368  may be provided to different antenna  352  via separate transmitters  354 TX. Each transmitter  354 TX may modulate an RF carrier with a respective spatial stream for transmission. 
     The UL transmission is processed at the base station  310  in a manner similar to that described in connection with the receiver function at the UE  350 . Each receiver  318 RX receives a signal through its respective antenna  320 . Each receiver  318 RX recovers information modulated onto an RF carrier and provides the information to a RX processor  370 . 
     The controller/processor  375  can be associated with a memory  376  that stores program codes and data. The memory  376  may be referred to as a computer-readable medium. In the UL, the controller/processor  375  provides demultiplexing between transport and logical channels, packet reassembly, deciphering, header decompression, control signal processing to recover IP packets from the UE  350 . IP packets from the controller/processor  375  may be provided to the EPC  160 . The controller/processor  375  is also responsible for error detection using an ACK and/or NACK protocol to support HARQ operations. 
     At least one of the TX processor  368 , the RX processor  356 , and the controller/processor  359  may be configured to perform aspects described in connection with the CLI avoidance component  198  of  FIG.  1   . 
     At least one of the TX processor  316 , the RX processor  370 , and the controller/processor  375  may be configured to perform aspects described in connection with the full-duplex component  199  of  FIG.  1   . 
     Wireless communication systems may be configured to share available system resources and provide various telecommunication services (e.g., telephony, video, data, messaging, broadcasts, etc.) based on multiple-access technologies that support communication with multiple users. 
       FIGS.  4 A- 4 C  illustrate various modes of full-duplex communication and associated interference that may be experienced by one or more devices. Full-duplex communication supports transmission and reception of information over a same frequency band in a manner that overlaps in time. In some aspects, the full-duplex communication may include uplink and downlink transmissions in FR2 that overlap in time. In this manner, spectral efficiency may be improved with respect to the spectral efficiency of half-duplex communication, which supports transmission or reception of information in one direction at a time without overlapping uplink and downlink communication. The full-duplex capability may be supported by a base station and/or by a UE. As an example, a UE may support uplink transmission from one antenna, or antenna panel, and simultaneous downlink reception at another antenna, or antenna panel. Simultaneous may refer to at least a partial overlap in time. As another example, the base station may transmit a downlink transmission with one antenna panel and simultaneously receive an uplink transmission from another antenna panel. In some aspects, the full-duplex capability may be conditional. As an example, a UE or a base station may support full-duplex communication if a threshold level of beam separation may be achieved. As another example, support for the full-duplex communication may be based on a self-interference condition being met, e.g., self-interference between downlink and uplink communication being below threshold level, or based on a clutter echo condition. 
     Due to the simultaneous Tx/Rx nature of full-duplex communication, a UE or a base station may experience self-interference caused by signal leakage from its local transmitter to its local receiver. In addition, the UE or base station may also experience interference from other devices, such as transmissions from a second UE or a second base station. Such interference (e.g., self-interference or interference caused by other devices) may impact the quality of the communication, or even lead to a loss of information. 
       FIG.  4 A  shows a first example of full duplex communication  400  in which a first base station  402   a  is in full duplex communication with a first UE  404   a  and a second UE  406   a . The first UE  404   a  and the second UE  406   a  may be configured for half-duplex communication or full-duplex communication.  FIG.  4 A  illustrates the first UE  404   a  performing downlink reception, and the second UE  406   a  performing uplink transmission. The second UE  406   a  may transmit a first uplink signal to the first base station  402   a  as well as to other base stations, such as a second base station  408   a  in proximity to the second UE  406   a . The first base station  402   a  transmits a downlink signal to the first UE  404   a  concurrently (e.g., overlapping at least partially in time) with receiving the uplink signal from the second UE  406   a . The base station  402   a  may experience self-interference at its receiving antenna that is receiving the uplink signal from UE  406   a , the self-interference being due to reception of at least part of the downlink signal transmitted to the UE  404   a . The base station  402   a  may experience additional interference due to signals from the second base station  408   a . Interference may also occur at the first UE  404   a  based on signals from the second base station  408   a  as well as from uplink signals from the second UE  406   a.    
       FIG.  4 B  shows a second example of full-duplex communication  410  in which a first base station  402   b  is in full-duplex communication with a first UE  404   b . In this example, the UE  404   b  is also operating in a full-duplex mode. The first base station  402   b  and the UE  404   b  receive and transmit communication that overlaps in time and is in a same frequency band. The base station and the UE may each experience self-interference, due to a transmitted signal from the device leaking to (e.g., being received by) a receiver at the same device. The first UE  404   b  may experience additional interference based on one or more signals emitted from a second UE  406   b  and/or a second base station  408   b  in proximity to the first UE  404   b.    
       FIG.  4 C  shows a third example of full-duplex communication  420  in which a first UE  404   c  transmits and receives full-duplex communication with a first base station  402   c  and a second base station  408   c . The first base station  402   c  and the second base station  408   c  may serve as multiple transmission and reception points (multi-TRPs) for UL and DL communication with the UE  404   c . The second base station  408   c  may also exchange communication with a second UE  406   c . In  FIG.  4 C , the first UE  404   c  may transmit an uplink signal to the first base station  402   c  that overlaps in time with receiving a downlink signal from the second base station  408   c . The first UE  404   c  may experience self-interference as a result of receiving at least a portion of the first signal when receiving the second signal, e.g., the UE&#39;s uplink signal to the base station  402   c  may leak to (e.g., be received by) the UE&#39;s receiver when the UE is attempting to receive the signal from the other base station  408   c . The first UE  404   c  may experience additional interference from the second UE  406   c.    
     Full duplex communication may be in a same frequency band. The uplink and downlink communication may be in different frequency subbands, in the same frequency subband, or in partially overlapping frequency subbands.  FIG.  5    illustrates a first example  500  and a second example  510  of in-band full-duplex (IBFD) resources and a third example  520  of sub-band full-duplex resources. In IBFD, signals may be transmitted and received in overlapping times and overlapping in frequency. As shown in the first example  500 , a time and a frequency allocation of transmission resources  502  may fully overlap with a time and a frequency allocation of reception resources  504 . In the second example  510 , a time and a frequency allocation of transmission resources  512  may partially overlap with a time and a frequency of allocation of reception resources  514 . 
     IBFD is in contrast to sub-band FDD, where transmission and reception resources may overlap in time using different frequencies, as shown in  520 . As shown in  520 , the transmission resources  522  are separated from the reception resources  524  by a guard band  526 . The guard band may be frequency resources, or a gap in frequency resources, provided between the transmission resources  522  and the reception resources  524 . Separating the transmission frequency resources and the reception frequency resources with a guard band may help to reduce self-interference. Transmission resources and a reception resources that are immediately adjacent to each other may be considered as having a guard band width of 0. As an output signal from a wireless device may extend outside the transmission resources, the guard band may reduce interference experienced by the wireless device. Sub-band FDD may also be referred to as “flexible duplex”. 
     If the full-duplex operation is for a UE or a device implementing UE functionality, the transmission resources  502 ,  512 , and  522  may correspond to uplink resources, and the reception resources  504 ,  514 , and  524  may correspond to downlink resources, in some aspects. Alternatively, if the full-duplex operation is for a base station or a device implementing base station functionality, the transmission resources  502 ,  512 , and  522  may correspond to downlink resources, and the reception resources  504 ,  514 , and  524  may correspond to uplink resources. 
     A slot format may be referred to as a “D+U” slot when the slot has a frequency band that is used for both uplink and downlink transmissions. The downlink and uplink transmissions may occur in overlapping frequency resources, such as shown in  504  and  506  (e.g., in-band full duplex resources) or may occur in adjacent or slightly separated frequency resources, such as shown in  520  (e.g., sub-band full duplex resources). In a particular D+U symbol, a half-duplex device may either transmit in the uplink band or receive in the downlink band. In a particular D+U symbol, a full-duplex device may transmit in the uplink band and receive in the downlink band, e.g., in the same symbol or in the same slot. A D+U slot may include downlink only symbols, uplink only symbols, and full-duplex symbols. 
       FIGS.  6 A-C  illustrate example scenarios in which a UE and/or a base station may exchange full-duplex communication.  FIG.  6 A  illustrates a diagram  600  showing a single UE that transmits uplink communication to a first TRP  601 , e.g., of a base station, and receives downlink communication from a second TRP  603  of the base station in a full duplex mode, e.g., in which the uplink and downlink communication are in a same frequency range and overlap at least partially in time.  FIG.  6 B  illustrates a diagram  625  showing a single base station  602  that exchanges wireless communication with multiple UEs in a full-duplex mode. For example, the base station  602  transmits downlink communication to the first UE  604  and receives uplink communication from a second UE  605  in a full-duplex manner, e.g., in which the uplink and downlink communication are in a same frequency range and overlap at least partially in time.  FIG.  6 C  illustrates a diagram  650  showing a single base station  602  that exchanges full-duplex communication with a single UE  604 , in which the uplink and downlink communication are in a same frequency range and overlap at least partially in time. 
       FIG.  6 B  illustrates that the uplink transmission from the second UE  605  may cause cross-link interference  610  to downlink reception at the first UE  604 . As an example of a downlink signal, the first UE  604  may receive a tracking reference signal (TRS) from the base station  602 . The TRS may be transmitted in a wideband, e.g., across the frequency resources of the base station  602  in order to provide UEs with a single to perform a more accurate time and frequency offset estimation. The UE  604  may use the TRS to monitor and track variations across a downlink BWP, e.g., across an entire downlink BWP. As illustrated in  FIG.  6 B , if the base station receives uplink communication from the second UE  605  in a full-duplex mode while the UE  604  is receiving the TRS, CLI  610  from the second UE  605  may affect the TRS reception at the first UE  604 . The UEs  604  and/or  605  may support half-duplex communication or may support full-duplex communication. For example, the UE  604  may operate in a half-duplex mode, yet experiences interference due to the full-duplex operation of the base station  602 . 
     A TRS is one example of a downlink signal that may be interfered by the uplink transmission from another UE. Similarly, the first UE&#39;s reception of a synchronization signal/physical broadcast channel block (SSB) may experience interference due to the uplink transmission by the second UE  605 . As another example, the first UE&#39;s reception of a synchronization signal/physical broadcast channel block (SSB) may experience interference due to the uplink transmission by the second UE  605 . As another example, the first UE&#39;s reception of a channel state information reference signal (CSI-RS) may experience interference due to the uplink transmission by the second UE  605 . As another example, the first UE&#39;s reception of remaining system information (RMSI) may experience interference due to the uplink transmission by the second UE  605 . As another example, the first UE&#39;s monitoring of a common search space (CSS) may experience interference due to the uplink transmission by the second UE  605 . As another example, the first UE&#39;s reception of a paging PDSCH may experience interference due to the uplink transmission by the second UE  605 . As another example, the first UE&#39;s reception of a random access occasion (RO) may experience interference due to the uplink transmission by the second UE  605 . As another example, the first UE&#39;s reception of a radio link monitoring (RLM) reference signal may experience interference due to the uplink transmission by the second UE  605 . As another example, the first UE&#39;s reception of a beam failure detection (BFD) reference signal may experience interference due to the uplink transmission by the second UE  605 . As another example, the first UE&#39;s reception of a PDCCH for BFD may experience interference due to the uplink transmission by the second UE  605 . As another example, the first UE&#39;s reception of an SS for the BFD may experience interference due to the uplink transmission by the second UE  605 . As another example, the first UE&#39;s reception of a phase tracking reference signal (PT-RS) may experience interference due to the uplink transmission by the second UE  605 . As another example, the first UE&#39;s reception of a positioning reference signal (PRS) may experience interference due to the uplink transmission by the second UE  605 . As another example, the first UE&#39;s reception of a reference signal associated with a modulation and coding scheme (MCS) may experience interference due to the uplink transmission by the second UE  605 . 
     Aspects presented herein provide protection for the accurate reception of one or more reference signals or downlink channels at a first UE than may experience interference due to an uplink transmission from a second UE to a base station operating in a full-duplex mode, e.g., exchanging uplink and downlink communication in a same frequency range and overlapping in time. The full-duplex communication of the base station may be in a frequency division multiplexed (FDM) mode, e.g., in which the downlink frequency bands are separated from the uplink frequency bands by a guard band, e.g., as described in connection with  520  in  FIG.  5   . In some aspects, the full-duplex communication of the base station may be based on spatial divisional multiplexing (SDM), e.g., in which the uplink transmission is received in one direction, and the downlink transmission is transmitted in a different direction. The frequency separation and/or spatial separation may help to reduce the interference to the UE  604  receiving the downlink reference signal or channel. However, even with a guard band and/or a different spatial direction, the UE  604  may experience interference from the uplink transmission of the UE  605 . 
       FIG.  7    illustrates an example communication flow  700  in which a base station  704  supports full-duplex communication with a UE  702  and another UE  705 . The base station  704  indicates to the UE  702  slots (or other time/frequency resources) that may experience CLI interference due to full-duplex communication of the base station  704 . The UE  702  may use the indication to skip reception of, or otherwise ignore, a TRS during the indicated slots. For example, the base station  704  may transmit a TRS  708  and  716  during slots that are not indicated, and the UE  702  may receive the TRSs at  710  and  718 . During an indicated slot, the UE  702  may skip reception of a TRS, e.g., as illustrated at  714 . The slot may be a slot during which the base station may receive an uplink transmission  713  from the other UE  705  in a full-duplex manner with transmission of the TRS  712 . In some aspects, the UE  702  may skip the reception of the TRS  712  based on the indication of the slot from the base station, at  706  and based on an estimated interference level. For example, if an estimated interference level is higher than a threshold amount, the UE  702  may skip the reception of the TRS  712 , at  714 . If the estimated interference level is lower than the threshold amount, the UE may receive the TRS in the indicated slot. 
     In some aspects, the UE  702  may measure interference in the TRS measurement, or corresponding DMRS, by subtracting an expected RSRP power from a total received RSSI. In some aspects, the UE may periodically measure CLI due to a neighbor UE, and may report the CLI measurements to the base station  704 , e.g., as illustrated at  703 . In some aspects, the indication, at  706 , may be based on the CLI measurements reported by the UE  702 . For example, the base station may determine that uplink transmissions from a neighbor UE cause CLI to the UE  702  based on the report, and the base station  704  may indicate slots in which the base station scheduled uplink transmissions from the UE  705  based on the CLI reported from the UE  702 . 
     The UE  702  may use the received TRS to determine a time and/or frequency offset estimation. For example, at  720 , the UE  702  may apply a frequency offset based on an estimation using the received TRS, e.g.,  708  and  716 . The UE  702  may use the frequency offset to exchange communication  720  with the base station, e.g., uplink or downlink communication. By avoiding reception of the TRS  712 , the UE  702  may obtain a more accurate time/frequency offset estimation. The base station  704  may assist the UE  702  in obtaining more accurate information by informing the UE  702  of the resources that are potentially interfered due to the full-duplex operation of the base station. 
     Although the example in  FIG.  7    is described for a TRS, the aspects may similarly be applied for other reference signals. For example, within the slots indicated at  706 , the UE  702  may skip reception of an SSB, a CSI-RS, RMSI, an RO, an RLM reference signal, a BFD reference signal, an SS for BFD, a PT-RS, a PRS, and/or a reference signal associated with an MCS. The UE may similarly skip monitoring a CSS in the indicated slots and/or reception of a paging PDSCH, a PDCCH for BFD, among other examples of channels for which reception may be skipped. 
     As well, although the example is described with an indication of slots in order to illustrate the concept, the base station may indicate more granular time resources, such as symbols, to the UE or may indicate less granular time resources, such as frames, for the UE to skip reception of a reference signal or downlink channel due to the potential for CLI caused by an uplink transmission to the base station. The base station may indicate other time and/or frequency resources to the UE for the UE to adjust or avoid reception of a reference signal or downlink channel. 
       FIG.  8    illustrates an example communication flow  800  in which a base station  804  supports full-duplex communication with a UE  802  and another UE  805 . For example,  FIG.  8    illustrates that the base station  804  may transmit downlink communication  812  and  820  to the UE  802  that overlaps in time with reception of uplink transmissions  813  and  822  from the UE  805 . Similar to the aspects described in  FIG.  7   , in some aspects, the UE  802  may measure CLI, at  810 , and report the measurements to the base station, at  803 . In contrast to  FIG.  7   , in  FIG.  8   , the base station  804  may use TDM scheduling, at  814 , to avoid scheduling uplink transmission (e.g.,  813  or  822 ) at a time that corresponds to a downlink transmission of a particular reference signal or downlink channel.  FIG.  8    illustrates an example in which the base station may avoid scheduling uplink transmissions during a time that the base station transmits the TRS  816 . The TRS is only one example, that the base station may avoid uplink allocations for one or more UEs that overlap with an SSB, a CSI-RS, RMSI, an RO, an RLM reference signal, a BFD reference signal, an SS for BFD, a PT-RS, a PRS, and/or a reference signal associated with an MCS, a CSS, a paging PDSCH, and/or a PDCCH for BFD, among other examples of channels for which reception may be skipped. For example, the base station  804  may schedule uplink communication in a full-duplex mode within resources that avoid one or more reference signals or downlink channels. The restricted resources, e.g., during which full-duplex communication is to be avoided, may be based on a rule, in some aspects. In some aspects, the base station may apply the TDM scheduling in response to the CLI report  803  from the UE  802 . 
       FIG.  9 A  illustrates an example communication flow  900  in which a base station  904  supports full-duplex communication with a UE  902  and another UE  905 . For example,  FIG.  9 A  illustrates that the base station  904  may transmit downlink communication  908  to the UE  902  that overlaps in time with reception of uplink transmissions  913  from the UE  905 . Similar to the aspects described in  FIG.  7   , in some aspects, the UE  902  may measure CLI, at  910 , and report the measurements to the base station, at  903 . At  906 , the base station  904  may indicate time and/or frequency resources to the UE  905  based on the full-duplex communication scheduled for the base station  904 . For example, the base station  904  may indicate to the UE  905  a pattern of resources based on downlink resources to which an uplink transmission from the UE  905  that may cause CLI for the UE  902 . The base station  904  may then transmit the downlink reference signal or downlink channel, such as a TRS  908 . As an example, at  914 , the UE  905  may use the indicated resources, e.g., the pattern, indicated at  906  to rate match an uplink transmission around the indicated resources (e.g. the resources of the TRS  908 ). By rate-matching around the indicated resources for, the UE  905  may help to reduce CLI in the TRS reception, e.g., at  910 , for the UE  902 . In some aspects, the base station  904  may indicate a pattern that includes a guard time and/or guard tone that surrounds the TRS resources. In some aspects, as illustrated at  916 , the UE may puncturing the uplink transmission based on the indicated resources. The UE  905  may then transmit the uplink transmission  913 , based on the puncturing or rate-matching. For example, the base station  904  may provide the UE  905  with an allocation of uplink resources, at  912 , the resources overlapping in time and frequency with the resources for a downlink reference signal, such as the TRS  908 . The UE  905  may transmit the uplink transmission  913  with the allocated resources after puncturing or rate-matching around the resources (within the allocated uplink resources) that are indicated in the pattern received at  906 . 
     As an example, the TRS  908  for reception by the UE  902  may be on symbol 2 and tone 2-3. At  906 , the base station  904  may indicate an uplink rate-matching pattern or puncturing pattern that includes symbol 2 and tones 2-3. In some aspects, the base station may provide a guard time or a guard frequency in the pattern and may indicate a pattern with symbol 1-3 and tone 1-4, within which the UE  905  is not to transmit the uplink transmission  913 , e.g., PUSCH.  FIG.  9 B  illustrates an example time and frequency resource diagram  950  showing the example resources for a TRS. The base station may indicate a pattern that includes the TRS resources and additional resources, e.g., surrounding the TRS resources in time and/or frequency. The UE  905  may use the remaining allocated resources to transmit the PUSCH. The UE  905  may rate-match or puncture the PUSCH on the indicated REs. For example, the uplink transmission  913  may include a PUSCH having resource holes that protect the reception of the TRS  908  by the UE  902 . In some aspects, the base station  904  may indicate a new rate-matching pattern due to the uplink puncturing around the TRS REs. 
     The TRS is only one example for which the base station may indicate the rate matching or puncturing pattern to the UE  905 . In other examples, the base station  904  may indicate a rate-matching pattern based on resources for any of an SSB, a CSI-RS, RMSI, an RO, an RLM reference signal, a BFD reference signal, an SS for BFD, a PT-RS, a PRS, and/or a reference signal associated with an MCS, a CSS, a paging PDSCH, and/or a PDCCH for BFD, among other examples of channels for which reception may be skipped. 
       FIG.  10 A  is a flowchart  1000  of a method of wireless communication. The method may be performed by a UE (e.g., the UE  104 ,  350 ,  604 ,  702 , or  802 ; the apparatus  1202 ). The method may improve measurements of downlink reference signals at the UE by adjusting for or reducing CLI due to full-duplex communication at the base station. In some aspects, the method may be applied for a tracking reference signal and may improve the accuracy of time and/or frequency estimations based on the TRS be protecting the TRS or measurements of the TRS from CLI from full-duplex communication. 
     At  1002 , the UE receives a configuration for one or more downlink reference signal or downlink channel from a base station. For example,  FIG.  7    illustrates that the UE  702  may receive a configuration for a TRS from the base station  704 . A TRS is merely one example. In other examples, the downlink reference signal or channel may be any of an SSB, a CSI-RS, RMSI, an RO, an RLM reference signal, a BFD reference signal, an SS for BFD, a PT-RS, a PRS, and/or a reference signal associated with an MCS, a CSS, a paging PDSCH, and/or a PDCCH for BFD. The UE may use the configuration to receive the downlink reference signal from the base station. The reception of the configuration may be performed, e.g., by the DL component  1240  of the apparatus  1202  in  FIG.  12   . 
     At  1004 , the UE receives an indication of one or more time and frequency resources for full-duplex communication at the base station.  FIG.  7    illustrates an example of a UE  702  receiving an indication  706  of resources from a base station  704  for which full-duplex uplink transmissions to the base station from another UE may cause CLI to the TRS reception at the UE  702 . The reception of the indication may be performed, e.g., by the CLI resource component  1242  of the apparatus  1202 . 
     At  1006 , the UE skips reception of the one or more downlink reference signal or downlink channel based at least in part on the indication of the one or more time and frequency resources for the full-duplex communication at the base station.  FIG.  7    illustrates an example in which the UE  702  skips the reception of the TRS  712 . By skipping the reception of the TRS, the UE  702  may improve the accuracy of a time/frequency estimation based on other TRSs without CLI. The skipping of the reception of the downlink reference signal or channel may be performed, e.g., by the CLI avoidance component  1244  of the apparatus  1202 . 
       FIG.  10 B  illustrates example aspects of a method of wireless communication  1050  that may include  1002 ,  1004 , and  1006  from  FIG.  10 A . As illustrated at  1001 , the UE may further transmit a report of CLI to the base station, the indication of the one or more time and frequency resources being based on the CLI at the UE.  FIG.  7    illustrates an example of a UE transmitting a report  703  to a base station. The transmission of the report may be performed, e.g., by the CLI report component  1246  of the apparatus  1202  in  FIG.  12   . 
     As illustrated at  1005 , the UE may further measure cross link interference from at least one neighbor UE, wherein the UE skips the reception of the one or more downlink reference signal or downlink channel based on the one or more time and frequency resources being scheduled for uplink transmission by the at least one neighbor UE and the cross link interference from the at least one neighbor UE being higher than a threshold. The measurement may be performed, e.g., by the CLI measurement component  1248  of the apparatus  1202 . The indication from the base station comprises a group common downlink control information scheduling resources for the at least one neighbor UE. 
     In some aspects, the configuration may be for a TRS and the UE may skip the reception of the TRS in the one or more time and frequency resources for the full-duplex communication indicated by the base station. 
       FIG.  11    is a flowchart  1100  of a method of wireless communication. The method may be performed by a UE (e.g., the UE  104 ,  350 ,  604 ,  905 ; the apparatus  1202 ). The method may improve measurements of downlink reference signals at another UE by adjusting for or reducing CLI due to full-duplex communication through rate matching or puncturing of uplink transmissions at the UE. 
     At  1102 , the UE receives, from a base station, an allocation of uplink resources for an uplink transmission.  FIG.  9 A  illustrates an example of a UE  905  receiving an uplink resource allocation  912 . The uplink resources may be allocated for a PUSCH transmission from the UE to the base station, for example. The reception of the allocation may be performed, e.g., by the uplink component  1250  of the apparatus  1202  in  FIG.  12   . 
     At  1104 , the UE receives an indication of one or more time and frequency resources for full-duplex communication at the base station.  FIG.  9 A  illustrates an example, of a UE  905  receiving an indication of resources, at  906 , from a base station as a rate-matching or puncturing pattern for an uplink transmission. The one or more time and frequency resources may be for downlink reception of one or more of an SSB, a CSI-RS, RMSI, an RO, an RLM reference signal, a BFD reference signal, an SS for BFD, a PT-RS, a PRS, and/or a reference signal associated with an MCS, a CSS, a paging PDSCH, and/or a PDCCH for BFD. The reception of the indication may be performed, e.g., by the CLI resource component  1242  of the apparatus  1202 . 
     At  1106 , the UE transmits the uplink transmission to avoid the one or more time and frequency resources for the full-duplex communication at the base station. In some aspects, the uplink transmission may be a PUSCH. For example,  FIG.  9 A  illustrates an example of a UE transmitting an uplink transmission  913  that includes puncturing or rate matching around the indicated resources. The transmission may be performed, e.g., by the CLI avoidance component  1244  of the apparatus  1202 . In some aspects, the indication may comprise an uplink puncturing pattern, and the UE may puncture the uplink transmission based on the uplink puncturing pattern. In some aspects, the indication may include an uplink rate matching pattern, and the UE may rate match the uplink transmission based on the uplink rate matching pattern. 
       FIG.  12    is a diagram  1200  illustrating an example of a hardware implementation for an apparatus  1202 . The apparatus  1202  may be a UE, a component of a UE, or may implement UE functionality. In some aspects, the apparatus  1202  may include a cellular baseband processor  1204  (also referred to as a modem) coupled to a cellular RF transceiver  1222 . In some aspects, the apparatus  1202  may further include one or more subscriber identity modules (SIM) cards  1220 , an application processor  1206  coupled to a secure digital (SD) card  1208  and a screen  1210 , a Bluetooth module  1212 , a wireless local area network (WLAN) module  1214 , a Global Positioning System (GPS) module  1216 , or a power supply  1218 . The cellular baseband processor  1204  communicates through the cellular RF transceiver  1222  with the UE  104  and/or BS  102 / 180 . The cellular baseband processor  1204  may include a computer-readable medium/memory. The computer-readable medium/memory may be non-transitory. The cellular baseband processor  1204  is responsible for general processing, including the execution of software stored on the computer-readable medium/memory. The software, when executed by the cellular baseband processor  1204 , causes the cellular baseband processor  1204  to perform the various functions described supra. The computer-readable medium/memory may also be used for storing data that is manipulated by the cellular baseband processor  1204  when executing software. The cellular baseband processor  1204  further includes a reception component  1230 , a communication manager  1232 , and a transmission component  1234 . The communication manager  1232  includes the one or more illustrated components. The components within the communication manager  1232  may be stored in the computer-readable medium/memory and/or configured as hardware within the cellular baseband processor  1204 . The cellular baseband processor  1204  may be a component of the UE  350  and may include the memory  360  and/or at least one of the TX processor  368 , the RX processor  356 , and the controller/processor  359 . In one configuration, the apparatus  1202  may be a modem chip and include just the baseband processor  1204 , and in another configuration, the apparatus  1202  may be the entire UE (e.g., see  350  of  FIG.  3   ) and include the additional modules of the apparatus  1202 . 
     The communication manager  1232  includes a DL RS/channel component  1240  may be configured to receive a configuration for one or more downlink reference signal or downlink channel from a base station, e.g., as described in connection with  1002  of  FIGS.  10 A and  10 B . The CLI resource component  1242  may be configured to receive an indication of one or more time and frequency resources for full-duplex communication at the base station, e.g., as described in connection with  1004  of  FIGS.  10 A and  10 B . The CLI avoidance component  1244  may be configured to skip reception of the one or more downlink reference signal or downlink channel based at least in part on the indication of the one or more time and frequency resources for the full-duplex communication at the base station, e.g., as described in connection with  1006  of  FIGS.  10 A and  10 B . The apparatus  1202  may include a CLI report component  1246  configured to transmit a report of CLI to the base station, the indication of the one or more time and frequency resources being based on the CLI at the UE, e.g., as described in connection with  1001  in  FIG.  10 B . The apparatus  1202  may include a CLI measurement component  1248  configured to measure cross link interference from at least one neighbor UE, e.g., as described in connection with  1005  in  FIG.  10 B . apparatus  1202  may include an uplink component  1250  that is configured to receive, from a base station, an allocation of uplink resources for an uplink transmission, e.g., as in  1102  in  FIG.  11   . In some aspects, the CLI resource component  1242  may be configured to receive an indication of one or more time and frequency resources for full-duplex communication at the base station, e.g., as described in connection with  1104  in  FIG.  11   . In some aspects, the CLI avoidance component  1244  may be configured to transmit the uplink transmission to avoid the one or more time and frequency resources for the full-duplex communication at the base station, e.g., as described in connection with  1106  in  FIG.  11   . 
     The apparatus may include additional components that perform each of the blocks of the algorithm in the flowcharts of  FIGS.  10 A,  10 B,  11 A,  11 B , and/or the aspects performed by the UE  702  in  FIG.  7   , the UE  802  in  FIG.  8   , or the UE  905  in  FIG.  9 A . As such, each block in the flowcharts of  FIGS.  10 A,  10 B,  11 A,  11 B , and/or the aspects performed by the UE  702  in  FIG.  7   , the UE  802  in  FIG.  8   , or the UE  905  in  FIG.  9 A  may be performed by a component and the apparatus may include one or more of those components. The components may be one or more hardware components specifically configured to carry out the stated processes/algorithm, implemented by a processor configured to perform the stated processes/algorithm, stored within a computer-readable medium for implementation by a processor, or some combination thereof. 
     As shown, the apparatus  1202  may include a variety of components configured for various functions. In one configuration, the apparatus  1202 , and in particular the cellular baseband processor  1204 , may include means for receiving a configuration for one or more downlink reference signal or downlink channel from a base station; means for receiving an indication of one or more time and frequency resources for full-duplex communication at the base station; and means for skipping reception of the one or more downlink reference signal or downlink channel based at least in part on the indication of the one or more time and frequency resources for the full-duplex communication at the base station. The apparatus  1202  may further include means for transmitting a report of CLI to the base station, the indication of the one or more time and frequency resources being based on the CLI at the UE. The apparatus  1202  may further include means for measuring cross link interference from at least one neighbor UE, wherein the UE skips the reception of the one or more downlink reference signal or downlink channel based on the one or more time and frequency resources being scheduled for uplink transmission by the at least one neighbor UE and the cross link interference from the at least one neighbor UE being higher than a threshold. The apparatus  1202  may further include means for receiving, from a base station, an allocation of uplink resources for an uplink transmission; means for receiving an indication of one or more time and frequency resources for full-duplex communication at the base station; and means for transmitting the uplink transmission to avoid the one or more time and frequency resources for the full-duplex communication at the base station. The apparatus  1202  may further include means for puncturing the uplink transmission based on the uplink puncturing pattern. The apparatus  1202  may further include means for rate matching the uplink transmission based on the uplink rate matching pattern. The means may be one or more of the components of the apparatus  1202  configured to perform the functions recited by the means. As described supra, the apparatus  1202  may include the TX Processor  368 , the RX Processor  356 , and the controller/processor  359 . As such, in one configuration, the means may be the TX Processor  368 , the RX Processor  356 , and the controller/processor  359  configured to perform the functions recited by the means. 
       FIG.  13 A  is a flowchart  1300  of a method of wireless communication. The method may be performed by a base station (e.g., the base station  102 / 180 ,  310 ,  602 ,  704 ,  804 ,  904 ; the apparatus  1402 ). The method may improve measurements of downlink reference signals at a UE by adjusting for or reducing CLI due to full-duplex communication to protect downlink reception of a particular reference signal or downlink channel. 
     At  1302 , the base station schedules full duplex communication including one or more downlink reference signal or downlink channel from the base station and an allocation of uplink resources for an uplink transmission to the base station based on CLI to a reception of the one or more downlink reference signal or downlink channel at a first UE. The downlink reference signal or channel may be any of an SSB, a CSI-RS, RMSI, an RO, an RLM reference signal, a BFD reference signal, an SS for BFD, a PT-RS, a PRS, and/or a reference signal associated with an MCS, a CSS, a paging PDSCH, and/or a PDCCH for BFD. In some aspects, the scheduling may be performed, e.g., by a CLI protection component  1440  of the apparatus  1402 . 
     At  1304 , the base station transmits the one or more downlink reference signal or downlink channel.  FIGS.  7 ,  8 , and  9    illustrate examples of a base station transmitting a TRS as one example of a downlink reference signal. The transmission may be performed, e.g., by the transmission component  1434  of the apparatus  1402 . 
       FIG.  13 B  illustrates an example flow chart  1350  that may include  1302  and  1304  of  FIG.  13 A . As illustrated at  1312 , the base station may transmit a configuration for the one or more downlink reference signal or downlink channel to the first UE. At  1314 , the base station may transmit an indication of the uplink resources for full-duplex communication at the base station. In some aspects, the configuration may be for a TRS, and the indication indicates for the first UE to skip the reception of the TRS in the uplink resources. The transmission may be performed, e.g., by the transmission component  1434  of the apparatus  1402 . 
     As illustrated at  1310 , the base station may receive a report of the CLI from the first UE, the indication of the uplink resources being based on the CLI at the first UE. The reception may be performed, e.g., by the reception component  1430  of the apparatus  1402 .  FIGS.  7 ,  8 , and  9 B  illustrate examples of a base station receiving a CLI report, e.g.,  703 ,  803 , or  903 ). 
     The scheduling the full duplex communication may include allocating the uplink resources to avoid an overlap in time with the one or more downlink reference signal or downlink channel. 
     The scheduling the full duplex communication may include transmitting the allocation of the uplink resources to a second UE; and transmitting an indication of at least one time resource for the one or more downlink reference signal or the downlink channel. 
     In some aspects, the indication comprises an uplink puncturing pattern, and the base station may receive the uplink transmission that avoids the at least one time resource includes based on the uplink puncturing pattern. In some aspects, the indication comprises an uplink rate matching pattern, and the base station may receive the uplink transmission based on rate matching around the at least one time resource of the uplink rate matching pattern.  FIG.  9 B  illustrates example aspects of a pattern of resources including resources for a TRS, as an example of a downlink reference signal. 
       FIG.  14    is a diagram  1400  illustrating an example of a hardware implementation for an apparatus  1402 . The apparatus  1402  may be a base station, a component of a base station, or may implement base station functionality. In some aspects, the apparatus  1202  may include a baseband unit  1404 . The baseband unit  1404  may communicate through a cellular RF transceiver  1422  with the UE  104 . The baseband unit  1404  may include a computer-readable medium/memory. The baseband unit  1404  is responsible for general processing, including the execution of software stored on the computer-readable medium/memory. The software, when executed by the baseband unit  1404 , causes the baseband unit  1404  to perform the various functions described supra. The computer-readable medium/memory may also be used for storing data that is manipulated by the baseband unit  1404  when executing software. The baseband unit  1404  further includes a reception component  1430 , a communication manager  1432 , and a transmission component  1434 . The communication manager  1432  includes the one or more illustrated components. The components within the communication manager  1432  may be stored in the computer-readable medium/memory and/or configured as hardware within the baseband unit  1404 . The baseband unit  1404  may be a component of the base station  310  and may include the memory  376  and/or at least one of the TX processor  316 , the RX processor  370 , and the controller/processor  375 . 
     The communication manager  1432  includes a CLI Protection component  1440  that is configured to schedule full duplex communication including one or more downlink reference signal or downlink channel from the base station and an allocation of uplink resources for an uplink transmission to the base station based on CLI to a reception of the one or more downlink reference signal or downlink channel at a first UE, e.g., as described in connection with  1302  in  FIG.  13 A or  13 B . 
     The apparatus may include additional components that perform each of the blocks of the algorithm in the flowcharts of  FIGS.  13 A,  13 B , and/or the aspects performed by the base station in any of  FIGS.  7 - 9   . As such, each block in the flowcharts of  FIGS.  13 A,  13 B , and/or the aspects performed by the base station in any of  FIGS.  7 - 9    may be performed by a component and the apparatus may include one or more of those components. The components may be one or more hardware components specifically configured to carry out the stated processes/algorithm, implemented by a processor configured to perform the stated processes/algorithm, stored within a computer-readable medium for implementation by a processor, or some combination thereof. 
     As shown, the apparatus  1402  may include a variety of components configured for various functions. In one configuration, the apparatus  1402 , and in particular the baseband unit  1404 , includes means for scheduling full duplex communication including one or more downlink reference signal or downlink channel from the base station and an allocation of uplink resources for an uplink transmission to the base station based on CLI to a reception of the one or more downlink reference signal or downlink channel at a first UE; and means for transmitting the one or more downlink reference signal or downlink channel. The apparatus  1402  may further include means for transmitting a configuration for the one or more downlink reference signal or downlink channel to the first UE; and means for transmitting an indication of the uplink resources for full-duplex communication at the base station. The apparatus  1402  may further include means for receiving a report of the CLI from the first UE, the indication of the uplink resources being based on the CLI at the first UE. The apparatus  1402  may further include means for allocating the uplink resources to avoid an overlap in time with the one or more downlink reference signal or downlink channel. The apparatus  1402  may further include means for transmitting the allocation of the uplink resources to a second UE; and means for transmitting an indication of at least one time resource for the one or more downlink reference signal or the downlink channel. The apparatus  1402  may further include means for receiving the uplink transmission that avoids the at least one time resource includes based on the uplink puncturing pattern. The apparatus  1402  may further include means for receiving the uplink transmission based on rate matching around the at least one time resource of the uplink rate matching pattern. The means may be one or more of the components of the apparatus  1402  configured to perform the functions recited by the means. As described supra, the apparatus  1402  may include the TX Processor  316 , the RX Processor  370 , and the controller/processor  375 . As such, in one configuration, the means may be the TX Processor  316 , the RX Processor  370 , and the controller/processor  375  configured to perform the functions recited by the means. 
     It is understood that the specific order or hierarchy of blocks in the processes/flowcharts disclosed is an illustration of example approaches. Based upon design preferences, it is understood that the specific order or hierarchy of blocks in the processes/flowcharts may be rearranged. Further, some blocks may be combined or omitted. The accompanying method claims present elements of the various blocks in a sample order, and are not meant to be limited to the specific order or hierarchy presented. 
     The previous description is provided to enable any person skilled in the art to practice the various aspects described herein. Various modifications to these aspects will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other aspects. Thus, the claims are not intended to be limited to the aspects shown herein, but is to be accorded the full scope consistent with the language claims, wherein reference to an element in the singular is not intended to mean “one and only one” unless specifically so stated, but rather “one or more.” Terms such as “if,” “when,” and “while” should be interpreted to mean “under the condition that” rather than imply an immediate temporal relationship or reaction. That is, these phrases, e.g., “when,” do not imply an immediate action in response to or during the occurrence of an action, but simply imply that if a condition is met then an action will occur, but without requiring a specific or immediate time constraint for the action to occur. The word “exemplary” is used herein to mean “serving as an example, instance, or illustration.” Any aspect described herein as “exemplary” is not necessarily to be construed as preferred or advantageous over other aspects. Unless specifically stated otherwise, the term “some” refers to one or more. Combinations such as “at least one of A, B, or C,” “one or more of A, B, or C,” “at least one of A, B, and C,” “one or more of A, B, and C,” and “A, B, C, or any combination thereof” include any combination of A, B, and/or C, and may include multiples of A, multiples of B, or multiples of C. Specifically, combinations such as “at least one of A, B, or C,” “one or more of A, B, or C,” “at least one of A, B, and C,” “one or more of A, B, and C,” and “A, B, C, or any combination thereof” may be A only, B only, C only, A and B, A and C, B and C, or A and B and C, where any such combinations may contain one or more member or members of A, B, or C. All structural and functional equivalents to the elements of the various aspects described throughout this disclosure that are known or later come to be known to those of ordinary skill in the art are expressly incorporated herein by reference and are intended to be encompassed by the claims. Moreover, nothing disclosed herein is intended to be dedicated to the public regardless of whether such disclosure is explicitly recited in the claims. The words “module,” “mechanism,” “element,” “device,” and the like may not be a substitute for the word “means.” As such, no claim element is to be construed as a means plus function unless the element is expressly recited using the phrase “means for.” 
     The following aspects are illustrative only and may be combined with other aspects or teachings described herein, without limitation. 
     Aspect 1 is a method of wireless communication, at a user equipment (UE), comprising: receiving a configuration for one or more downlink reference signal or downlink channel from a base station; receiving an indication of one or more time and frequency resources for full-duplex communication at the base station; and skipping reception of the one or more downlink reference signal or downlink channel based at least in part on the indication of the one or more time and frequency resources for the full-duplex communication at the base station. 
     In aspect 2, the method of aspect 1 further includes that the one or more downlink reference signal or downlink channel comprise one or more of: a TRS, a SSB, a CSI-RS, a CSS, RMSI, paging PDSCH, a RO, a RLM reference signal, a BFD reference signal, a PDCCH for BFD, a SS for the BFD, a PT-RS, a PRS, or a reference signal associated with a MCS. 
     In aspect 3, the method of aspect 1 or aspect 2 further includes transmitting a report of cross link CLI to the base station, the indication of the one or more time and frequency resources being based on the CLI at the UE. 
     In aspect 4, the method of any of aspects 1-3 further includes measuring cross link interference from at least one neighbor UE, wherein the UE skips the reception of the one or more downlink reference signal or downlink channel based on the one or more time and frequency resources being scheduled for uplink transmission by the at least one neighbor UE and the cross link interference from the at least one neighbor UE being higher than a threshold. 
     In aspect 5, the method of aspect 4 further includes that the indication from the base station comprises a group common downlink control information scheduling resources for the at least one neighbor UE. 
     In aspect 6, the method of any of aspects 1-5 further includes that the UE receives the configuration for a TRS and skips the reception of the TRS in the one or more time and frequency resources for the full-duplex communication indicated by the base station. 
     Aspect 7 is an apparatus for wireless communication including at least one processor coupled to a memory, the at least one processor configured to, based at least in part on information stored in the memory, perform the method of any of aspects 1-6. 
     In aspect 8, the apparatus of aspect 7 further includes at least one transceiver coupled to the at least one processor. 
     In aspect 9, the apparatus of aspect 7 or aspect 8 further includes at least one antenna coupled to the at least one processor. 
     Aspect 10 is an apparatus for wireless communication including means for performing the method of any of aspects 1-6. 
     In aspect 11, the apparatus of aspect 10 further includes at least one transceiver. 
     In aspect 12, the apparatus of aspect 10 or aspect 11 further includes at least one antenna. 
     Aspect 13 is a non-transitory computer-readable medium storing computer executable code, where the code when executed by a processor causes the processor to implement any of aspects 1-6. 
     Aspect 14 is a method of wireless communication, at a UE, comprising: receiving, from a base station, an allocation of uplink resources for an uplink transmission; receiving an indication of one or more time and frequency resources for full-duplex communication at the base station; and transmitting the uplink transmission to avoid the one or more time and frequency resources for the full-duplex communication at the base station. 
     In aspect 15, the method of aspect 14 further includes that the one or more time and frequency resources are for downlink reception of one or more of: a TRS, a SSB, a CSI-RS, a CSS, RMSI, paging PDSCH, a RO, a RLM reference signal, a BFD reference signal, a PDCCH for BFD, a SS for the BFD, a PT-RS, a PRS, or a reference signal associated with a MCS. 
     In aspect 16, the method of aspect 14 or 15 further includes that the indication comprises an uplink puncturing pattern, wherein transmitting the uplink transmission to avoid the one or more time and frequency resources includes puncturing the uplink transmission based on the uplink puncturing pattern. 
     In aspect 17, the method of aspect 14 or 15 further includes that the indication comprises an uplink rate matching pattern wherein transmitting the uplink transmission to avoid the one or more time and frequency resources includes rate matching the uplink transmission based on the uplink rate matching pattern. 
     Aspect 18 is an apparatus for wireless communication including at least one processor coupled to a memory, the at least one processor configured to, based at least in part on information stored in the memory, perform the method of any of aspects 14-17. 
     In aspect 19, the apparatus of aspect 18 further includes at least one transceiver coupled to the at least one processor. 
     In aspect 20, the apparatus of aspect 18 or aspect 19 further includes at least one antenna coupled to the at least one processor. 
     Aspect 21 is an apparatus for wireless communication including means for performing the method of any of aspects 14-17. 
     In aspect 22, the apparatus of aspect 21 further includes at least one transceiver. 
     In aspect 23, the apparatus of aspect 21 or aspect 22 further includes at least one antenna. 
     Aspect 24 is a non-transitory computer-readable medium storing computer executable code, where the code when executed by a processor causes the processor to implement any of aspects 14-17. 
     Aspect 25 is a method of wireless communication, at a base station, comprising: scheduling full duplex communication including one or more downlink reference signal or downlink channel from the base station and an allocation of uplink resources for an uplink transmission to the base station based on CLI to a reception of the one or more downlink reference signal or downlink channel at a first UE; and transmitting the one or more downlink reference signal or downlink channel. 
     In aspect 26, the method of aspect 25 further includes that the one or more downlink reference signal or downlink channel comprising one or more of a TRS, a SSB, a CSI-RS, a CSS, RMSI or paging PDSCH, a RO, a RLM reference signal, a BFD reference signal, a PDCCH for BFD, a SS for the BFD, a PT-RS, a PRS, or a reference signal associated with a MCS. 
     In aspect 27, the method of aspect 25 or aspect 26 further includes that scheduling the full duplex communication includes: transmitting a configuration for the one or more downlink reference signal or downlink channel to the first UE; and transmitting an indication of the uplink resources for full-duplex communication at the base station. 
     In aspect 28, the method of any of aspects 25-27 further includes receiving a report of the CLI from the first UE, the indication of the uplink resources being based on the CLI at the first UE. 
     In aspect 29, the method of any of aspects 25-28 further includes that the configuration is for a TRS, and the indication indicates for the first UE to skip the reception of the TRS in the uplink resources. 
     In aspect 30, the method of any of aspect 25 further includes that scheduling the full duplex communication includes: allocating the uplink resources to avoid an overlap in time with the one or more downlink reference signal or downlink channel. 
     In aspect 31, the method of any of aspect 25 further includes that scheduling the full duplex communication includes: transmitting the allocation of the uplink resources to a second UE; and transmitting an indication of at least one time resource for the one or more downlink reference signal or the downlink channel. 
     In aspect 32, the method of aspect 31 further includes that the indication comprises an uplink puncturing pattern, the method further comprising: receiving the uplink transmission that avoids the at least one time resource includes based on the uplink puncturing pattern. 
     In aspect 33, the method of aspect 31 further includes that the indication comprises an uplink rate matching pattern, the method further comprising: receiving the uplink transmission based on rate matching around the at least one time resource of the uplink rate matching pattern. 
     Aspect 34 is an apparatus for wireless communication including at least one processor coupled to a memory, the at least one processor configured to, based at least in part on information stored in the memory, perform the method of any of aspects 25-33. 
     In aspect 35, the apparatus of aspect 34 further includes at least one transceiver coupled to the at least one processor. 
     In aspect 36, the apparatus of aspect 34 or aspect 35 further includes at least one antenna coupled to the at least one processor. 
     Aspect 37 is an apparatus for wireless communication including means for performing the method of any of aspects 25-33. 
     In aspect 38, the apparatus of aspect 37 further includes at least one transceiver. 
     In aspect 39, the apparatus of aspect 37 or aspect 38 further includes at least one antenna. 
     Aspect 40 is a non-transitory computer-readable medium storing computer executable code, where the code when executed by a processor causes the processor to implement any of aspects 25-33. 
     Aspect 41 is a method of wireless communication, at a UE, comprising: receiving a configuration for one or more downlink reference signal or downlink channel from a base station; receiving an indication of one or more time and frequency resources for full-duplex communication at the base station; and skipping reception of the one or more downlink reference signal or downlink channel based at least in part on the indication of the one or more time and frequency resources for the full-duplex communication at the base station. 
     In aspect 42, the method of aspect 41 further includes that the one or more downlink reference signal or downlink channel comprise one or more of: a TRS, a SSB, a CSI-RS, a CSS, RMSI or paging PDSCH, a RO, a RLM reference signal, a BFD reference signal, a PDCCH for BFD, a SS for the BFD, a PT-RS, a PRS, or a reference signal associated with a MCS. 
     In aspect 43, the method of aspect 41 or 42 further includes transmitting a report of CLI to the base station, the indication of the one or more time and frequency resources being based on the CLI at the UE. 
     In aspect 44, the method of any of aspects 41-43 further includes measuring cross link interference from at least one neighbor UE, wherein the UE skips the reception of the one or more downlink reference signal or downlink channel based on the one or more time and frequency resources being scheduled for uplink transmission by the at least one neighbor UE and the cross link interference from the at least one neighbor UE being higher than a threshold. 
     In aspect 45, the method of aspect 44 further includes that the indication from the base station comprises a group common downlink control information scheduling resources for the at least one neighbor UE. 
     In aspect 46, the method of any of aspects 41-45 further includes that the UE receives the configuration for a TRS and skips the reception of the TRS in the one or more time and frequency resources for the full-duplex communication indicated by the base station. 
     Aspect 47 is an apparatus for wireless communication including at least one processor coupled to a memory, the at least one processor configured to, based at least in part on information stored in the memory, perform the method of any of aspects 41-46. 
     In aspect 48, the apparatus of aspect 47 further includes at least one transceiver coupled to the at least one processor. 
     In aspect 49, the apparatus of aspect 47 or aspect 48 further includes at least one antenna coupled to the at least one processor. 
     Aspect 50 is an apparatus for wireless communication including means for performing the method of any of aspects 41-46. 
     In aspect 51, the apparatus of aspect 50 further includes at least one transceiver. 
     In aspect 52, the apparatus of aspect 50 or aspect 51 further includes at least one antenna. 
     Aspect 53 is a non-transitory computer-readable medium storing computer executable code, where the code when executed by a processor causes the processor to implement any of aspects 41-46.