Patent Publication Number: US-2023146833-A1

Title: Cell-level srs configuration for cross-link interference management in full duplex

Description:
TECHNICAL FIELD 
     The present disclosure relates generally to communication systems, and more particularly, to intra-cell cross-link interference (CLI). 
     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 are provided. The apparatus may be a first device at a base station or a base station itself. The apparatus may be configured to transmit a configuration of a first set of common resources for a SRS for cross-link interference measurement, the first set of common resources being common to a first plurality of UEs. The apparatus may further be configured to receive, from a second UE in the first plurality of UEs, a report of the cross-link interference associated with a first UE in the first plurality of UEs and measured via a first resource in the first set of common resources. 
     In an aspect of the disclosure, a method, a computer-readable medium, and an apparatus are provided. The apparatus may be a second device at a UE or a UE itself. The apparatus may be configured to receive, from a base station, a configuration indicating a set of common resources for a SRS for cross-link interference measurement between UEs. The apparatus may further be configured to transmit a first SRS in a first resource in the set of common resources. 
     In an aspect of the disclosure, a method, a computer-readable medium, and an apparatus are provided. The apparatus may be a third device at a UE or a UE itself. The apparatus may be configured to receive, from a base station, a configuration indicating a first set of common resources for a SRS for cross-link interference measurement between UEs. The apparatus may further be configured to measure a cross-link interference from a SRS transmission received from a first UE via a first resource in the first set of common resources. The apparatus may further be configured to transmit, to the base station, a report of the measured cross-link interference. 
     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 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. 
         FIG.  6    illustrates an example communication system with a full-duplex base station that includes intra-cell CLI caused to a first UE by a second UE that are located within the same cell coverage as well as inter-cell interference from a base station outside of the cell coverage, in accordance with various aspects of the present disclosure. 
         FIG.  7    illustrates CLI and CLI leakage in SBFD and IBFD, in accordance with various aspects of the present disclosure. 
         FIG.  8    illustrates a set of SRS associated with (e.g., transmitted by) a set of UEs communicating with a base station, in accordance with various aspects of the present disclosure. 
         FIG.  9    is a call flow diagram illustrating a set of operations associated with CLI measurement based on a cell-level SRS configuration, in accordance with various aspects of the present disclosure. 
         FIG.  10    illustrates example sub-cell-level CLI-SRS configuration implementations, 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 flowchart of a method of wireless communication, in accordance with various aspects of the present disclosure. 
         FIG.  13    is a flowchart of a method of wireless communication, in accordance with various aspects of the present disclosure. 
         FIG.  14    is a flowchart of a method of wireless communication, in accordance with various aspects of the present disclosure. 
         FIG.  15    is a flowchart of a method of wireless communication, in accordance with various aspects of the present disclosure. 
         FIG.  16    is a diagram illustrating an example of a hardware implementation for an apparatus, in accordance with various aspects of the present disclosure. 
         FIG.  17    is a diagram illustrating an example of a hardware implementation for an apparatus, in accordance with various aspects of the present disclosure. 
         FIG.  18    illustrates aspects of an example slot structure for sidelink communication, in accordance with various aspects of the present disclosure. 
     
    
    
     DETAILED DESCRIPTION 
     For wireless communication with a base station, a UE may be configured to transmit a sounding reference signal (SRS) to the base station. The base station uses the SRS to perform uplink measurements for the UE. A UE may experience interference due to transmissions to and/or from another UE. The other UE may communicate with the same cell as the UE experiencing the interference, or may communicate with another cell. Aspects presented herein provide for CLI-SRS resources to be configured by a base station for each of a plurality of UEs served by the base station. A first UE may measure the CLI-SRS transmission of a second UE to determine cross-link interference experienced by the first UE due to uplink transmissions of the second UE. In order to measure CLI, CLI-SRS resources, aspects presented herein provide for alignment in the CLI-SRS resources for different user equipments (UEs) in the plurality of UEs. A base station may align a zero-power (ZP) CLI-SRS at a first UE with a non-ZP-CLI-SRS (e.g., a SRS transmission) at a second UE. Some aspects provide group-based (e.g., cell level, zone-based, or aggressor-based) CLI-SRS configurations that reduce management overhead associated with aligning CLI-SRS resources at different UEs independently. The group-based CLI-SRS resources may be used in association with communication between a UE and a base station or in association with sidelink communication. 
     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  (e.g., 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 (eNB s) (HeNB s), 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. 
     Some examples of sidelink communication may include vehicle-based communication devices that can communicate from vehicle-to-vehicle (V2V), vehicle-to-infrastructure (V2I) (e.g., from the vehicle-based communication device to road infrastructure nodes such as a Road Side Unit (RSU)), vehicle-to-network (V2N) (e.g., from the vehicle-based communication device to one or more network nodes, such as a base station), vehicle-to-pedestrian (V2P), cellular vehicle-to-everything (C-V2X), and/or a combination thereof and/or with other devices, which can be collectively referred to as vehicle-to-anything (V2X) communications. Sidelink communication may be based on V2X or other D2D communication, such as Proximity Services (ProSe), etc. In addition to UEs, sidelink communication may also be transmitted and received by other transmitting and receiving devices, such as Road Side Unit (RSU)  107 , etc. Sidelink communication may be exchanged using a PC5 interface, such as described in connection with the example in  FIG.  18   . Although the following description, including the example slot structure of  FIG.  2   , may provide examples for sidelink communication in connection with 5G NR, the concepts described herein may be applicable to other similar areas, such as LTE, LTE-A, CDMA, GSM, and other wireless technologies. 
     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 cell-level CLI-SRS component  198  configured to receive, from a base station, a configuration indicating a set of common resources for a SRS for cross-link interference measurement between UEs. The cell-level CLI-SRS component  198  may further be configured to transmit a first SRS in a first resource in the set of common resources. In some aspects, the cell-level CLI-SRS component  198  may be configured to receive, from a base station, a configuration of a first set of common resources for a SRS for cross-link interference measurement between UEs. The cell-level CLI-SRS component  198  may be configured to measure a cross-link interference from a SRS transmission received from a first UE via a first resource in the first set of common resources. The cell-level CLI-SRS component  198  may further be configured to transmit, to the base station, a report of the measured cross-link interference. The cell-level CLI-SRS component  198  may further be configured to transmit a second SRS via a second resource in the first set of common resources for measurement of the cross-link interference from the second UE. In certain aspects, the base station  180  may include a cell-level CLI-SRS component  199  configured to transmit a configuration of a first set of common resources for a SRS for cross-link interference measurement, the first set of common resources being common to a first plurality of UEs. The cell-level CLI-SRS component  199  may further be configured to receive, from a second UE in the first plurality of UEs, a report of the cross-link interference associated with a first UE in the first plurality of UEs and measured via a first resource in the first set of common resources. 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.  18    includes diagrams  1800  and  1810  illustrating example aspects of slot structures that may be used for sidelink communication (e.g., between UEs  104 , RSU  107 , etc.). The slot structure may be within a 5G/NR frame structure in some examples. In other examples, the slot structure may be within an LTE frame structure. 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. The example slot structure in  FIG.  18    is merely one example, and other sidelink communication may have a different frame structure and/or different channels for sidelink communication. 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 7 or 14 symbols, depending on the slot configuration. For slot configuration 0, each slot may include 14 symbols, and for slot configuration 1, each slot may include 7 symbols. Diagram  1800  illustrates a single resource block of a single slot transmission, e.g., which may correspond to a 0.5 ms transmission time interval (TTI). A physical sidelink control channel may be configured to occupy multiple physical resource blocks (PRBs), e.g., 10, 12, 15, 20, or 25 PRBs. The PSCCH may be limited to a single sub-channel. A PSCCH duration may be configured to be 2 symbols or 3 symbols, for example. A sub-channel may comprise 10, 15, 20, 25, 50, 75, or 100 PRBs, for example. The resources for a sidelink transmission may be selected from a resource pool including one or more subchannels. As a non-limiting example, the resource pool may include between 1-27 subchannels. A PSCCH size may be established for a resource pool, e.g., as between 10-100% of one subchannel for a duration of 2 symbols or 3 symbols. The diagram  1810  in  FIG.  18    illustrates an example in which the PSCCH occupies about 50% of a subchannel, as one example to illustrate the concept of PSCCH occupying a portion of a subchannel. The physical sidelink shared channel (PSSCH) occupies at least one subchannel. The PSCCH may include a first portion of sidelink control information (SCI), and the PSSCH may include a second portion of SCI in some examples. 
     A resource grid may be used to represent the frame structure. Each time slot may include 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.  18   , some of the REs may include control information in PSCCH and some REs may include demodulation RS (DMRS). At least one symbol may be used for feedback.  FIG.  18    illustrates examples with two symbols for a physical sidelink feedback channel (PSFCH) with adjacent gap symbols. A symbol prior to and/or after the feedback may be used for turnaround between reception of data and transmission of the feedback. The gap enables a device to switch from operating as a transmitting device to prepare to operate as a receiving device, e.g., in the following slot. Data may be transmitted in the remaining REs, as illustrated. The data may comprise the data message described herein. The position of any of the data, DMRS, SCI, feedback, gap symbols, and/or LBT symbols may be different than the example illustrated in  FIG.  18   . Multiple slots may be aggregated together in some aspects. 
       FIG.  3    is a block diagram of a first wireless device in communication with a second wireless device. Although aspects will be described in connection with a base station  310  in communication with a UE  350  in an access network, in some aspects, the first wireless device may be a UE that measures SRS transmissions from the second device, e.g., the second device may be a second UE. In some aspects, the first and the second UE may communicate with a base station based in an access network based on Uu communication. In some aspects, the first UE and the second UE may communicate based on sidelink. 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 in connection with  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 in connection with  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 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 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. 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. 
       FIG.  6    illustrates an example communication system  600  with a full-duplex base station  602  that includes intra-cell cross-link interference (CLI) caused to UE  604  by UE  606  that are located within the same cell coverage  610  as well as inter-cell interference from a base station  608  outside of the cell coverage  610 . The full-duplex base station may be operating in one of a sub-band full duplex (SBFD) mode or an IBFD mode. Although not shown, a full-duplex UE may cause self-interference to its own downlink reception. In SBFD, a base station may configure a downlink transmission to a UE in frequency domain resources that are adjacent to frequency domain resources for uplink transmissions for another UE. For example, in  FIG.  6   , the frequency resources for the downlink transmission to the UE  604  may be adjacent to the frequency resources for the uplink transmission from the UE  606 . 
       FIG.  7    illustrates aspects of CLI and CLI leakage in SBFD and IBFD. In some aspects, the CLI may be due to energy leakage caused by timing and frequency misalignment between uplink resources and downlink resources associated with different UEs (e.g., a UE 1 and a UE2, respectively), or due to automatic gain control (AGC) mismatch if the AGC for UE2 is driven by a DL serving cell signal associated with UE2, but the CLI  725  (or CLI leakage  714  or  724 ) is strong enough to saturate the AGC. In SBFD, a base station (e.g., the base station  602 ) may configure the DL transmission to a UE (e.g., ‘UE2’ or the UE  604 ) in frequency domain resources  717  and  718  adjacent to the frequency domain resources  716  configured for UL transmission from another UE (e.g., ‘UE1’ or the UE  606 ). 
     Diagram  710  illustrates a set of SBFD resources, including uplink resources  716  and downlink resources  717  and  718  similar to the resource allocation described in relation to  FIG.  5   . Graph  712  illustrates uplink signal power over frequency indicating CLI  714  from the uplink signals leaking outside of the uplink frequency range (e.g., UL resources  716 ) into downlink frequency resources (e.g., DL resources  717  and  718 ) provided in the sub-band full-duplex resources  710 . Similarly, diagram  720  illustrates a set of IBFD resources including uplink resources  726  and downlink resources  727 . Graph  722  illustrates uplink signal power over frequency indicating CLI  725  in a set of overlapping uplink and downlink resources and CLI leakage  724  based on the uplink signal leaking outside of the uplink frequency range (e.g., UL resources  726 ) provided in the IBFD resources into downlink frequency resources (e.g., DL resources  727 ). 
     A base station may configure a UE to transmit a sounding reference signal (SRS) as an uplink reference signal. The base station may use the SRS transmitted by the UE to measure channel quality for an uplink path of the UE. The base station may configure the UE to transmit the SRS in SRS resources in time and frequency. 
     For individual SRS configurations, the SRS frequency domain (e.g., a frequency range for SRS transmissions/measurements) may be defined in reference to an active BWP part at each individual UE. An SRS frequency domain configuration for individual SRS configuration may indicate a frequency starting point k 0  (i.e., the lowest RE) of the SRS that may be defined based on a combination of three frequency offsets (f 1 +f 2 +f 3 ). The first frequency offset, f 1  is related to frequency hopping and may have a granularity of 4 RBs. The second frequency offset, f 2 , is the RB level shift, it has a granularity of 1 RB. The third frequency offset, f 3 , is a RE level shift. With the three frequency offsets, a network (e.g., a base station) may configure the starting position of SRS at any RE in any RB within an active BWP associated with the SRS transmitting UE. 
     In some aspects, the second offset is equal to n shift  RBs. n shift  determines the selection of one of two options for the frequency reference point. Given a first variable, N BWP   start , that is defined as the lowest frequency RB of the BWP in the cell and a common RB 0 that is the lowest frequency RB of the cell, if N BWP   start ≤n shift  the frequency reference point is subcarrier 0 in common resource block 0 (Option 1), otherwise the frequency reference point is the lowest subcarrier of the BWP (Option 2). In some aspects, the n shift  has a limited value range that allows for a maximum shift of 268 RBs which corresponds to about 50 MHz for 15 kHz SCS. If the cell has a carrier bandwidth wider than this range, the network may be unable to configure SRS in the full bandwidth if subcarrier 0 in common RB 0 is used as the reference point. In the individual SRS configurations, it is possible that depending on the BWP configuration, some UE may use option 1 and some UE may use option 2. For UEs using option 2, the same SRS configuration may also result in different SRS transmission due to different BWP configuration. 
       FIG.  8    illustrates an example a set of SRS resources  800  that may be configured for a UE. A particular UE may use a first set of UL/DL resources  810  for data or control and a second set of SRS resources  820  for transmission of the SRS. The SRS may be mapped to physical resources in a resource block, in some aspects. The SRS may span up to four symbols in the last 6 symbols of a slot and may be configured in frequency with a comb offset (e.g., comb-2 and/or comb-4). The SRS may further be configured to be one of periodic, aperiodic, or semi-persistent. A periodic SRS configuration may include a periodicity, a slot offset, and/or a frequency hopping pattern. A SRS configuration may further include a sounding bandwidth (or BWP) that may be the same as the active bandwidth (or BWP) (not illustrated in  FIG.  8   ) or may be different from an active bandwidth (or BWP) as illustrated in  FIG.  8   .  FIG.  8    illustrates a sounding bandwidth that is included within the active bandwidth, but the sounding bandwidth, in some aspects, may not overlap with, or may only partially overlap with, the active bandwidth. The SRS configuration may include a frequency hopping pattern for the UE to apply when transmitting the SRS in the configured resources. 
     The base station configures a UE specific SRS configuration, e.g., as part of a BWP configuration, in order to measure the uplink channel characteristics for the particular UE. In some aspects, a UE that is experiencing interference from another UE may provide a CLI measurement to a base station in L3 reporting that is based on an SRS transmission from an interfering UE. In order for the interfered UE to measure the CLI, the interfered UE may be configured with a ZP-SRS as a periodic measurement resource to measure the SRS of the interfering UE. In order to enable the UE to provide the report, the base station will configure the configurations of the two UEs to align, e.g., the SRS resources configured for the interfering UE to align with the ZP-SRS measurement resources configured for the interfered UE. As the SRS configuration is UE specific, the base station may configure pairs of configurations for each set of UEs that may experience CLI. A single UE may be configured with multiple configurations, or multiple sets of resources, in order to measure SRS transmissions from different UEs. 
     Aspects presented herein provide for a cell level CLI-SRS configuration that may enable CLI measurements based on SRS between a plurality of different UEs. The cell level CLI-SRS configuration may enable the CLI measurements and reporting with reduced configuration signaling overhead and/or management from the base station. The cell level CLI SRS configuration may include aspects that are applicable for both the NZP CLI SRS, e.g., SRS resources for SRS transmission, and for ZP CLI SRS, e.g., measurement resources to receive and measure the SRS. To allow cell level CLI-SRS, in some aspects, a common reference frequency that is not dependent on the active BWP at each UE is used for multiple UEs for which the cell level CLI-SRS a group-based SRS configuration is applied. 
     In some aspects, a base station may flexibly trigger an aperiodic-SRS (A-SRS) based on a RRC configuration including a list of available slot ‘t’ values via an DCI indication of a particular ‘t’ value. A slot may be available for A-SRS if there are UL/Flexible symbols (e.g., a symbol in resources  710  of  FIG.  7   ) that accommodate all SRS resources of a triggered SRS set. For example, in some aspects, DCI that schedules a PDSCH (or a PUSCH) and DCI 0_1 (or DCI 0_2) without data and without CSI request may indicate T by adding a new configurable DCI field (e.g., up to 2 bits). In some aspects, the indication is not unless there are multiple candidate values of ‘t’ configured. 
     In some aspects of wireless communication, CLI-SRS resources are configured by a base station for each of a plurality of UEs served by the base station. In order to measure CLI, CLI-SRS resources, in some aspects, are aligned for different UEs in the plurality of UEs. A base station may align a zero-power (ZP) CLI-SRS at a first UE with a non-ZP-CLI-SRS (e.g., a SRS transmission) at a second UE. Some aspects provide group-based (e.g., cell level, zone-based, or aggressor-based) CLI-SRS configurations that reduce management overhead associated with aligning CLI-SRS resources at different UEs independently. The group-based CLI-SRS resources may be used in association with communication between a UE and a base station or in association with sidelink communication. In some aspects, the cell level CLI-SRS may be for Uu interference measurements, e.g., of an uplink SRS transmission. In some aspects, the cell level CLI-SRS may be configured to UEs to use for sidelink interference measurements, e.g., of a sidelink SRS transmission. 
       FIG.  9    is a call flow diagram  900  illustrating a set of operations associated with CLI measurement based on a cell-level SRS configuration. The BS  902  may transmit, and UEs  904  and  906  may receive, SRS configuration  912  that indicates a set of common (e.g., cell-level or zone-level) SRS resources. The SRS configuration  912  may indicate zero-power (ZP) CLI-SRS resources that may be used by at least one UE for measuring CLI based on SRS received from at least one other UE and non-ZP CLI-SRS resources that may be used for transmitting SRS for CLI measurement at the at least one other UE. Although the configuration  912  is illustrated with two lines, the configuration may be included in signaling that is received in common by the UEs  904  and  906 . In some aspects, the configuration  912  may be included in cell level signaling that is receivable by each UE in the cell, e.g., such as a cell level RRC configuration. Thus, the configuration may be used in common by multiple UEs. In some aspects, the configuration may be used in common by any UE in the cell. In some aspects, the SRS configuration  912  may indicate different ZP-CLI-SRS resources and NZP-CLI-SRS resources for the UE  904  and the UE  906 . For example, the SRS configuration  912  may indicate a particular resource as a ZP-CLI-SRS resource for a first UE (e.g., UE  904 ), while indicating the particular resource as an NZP-CLI-SRS resource for a second UE (e.g., UE  906 ), such that the second UE transmits a SRS transmission via the particular resource and the first UE receives the SRS transmission for measuring the CLI via the particular resource. 
     The SRS configuration  912  may indicate a SCS of the first set of common SRS resources and a reference frequency (e.g., used to indicate a frequency range and/or bandwidth) associated with the first set of common SRS resources. In some aspects, the SRS configuration  912  may provide SRS and reference frequency information for the CLI-SRS configuration by including a set of fields in an information element (IE) of the RRC associated with the SRS for a CLI measurement, e.g., dedicated for the CLI-SRS. In some aspects, the RRC configuration for the CLI-SRS may include one or more of a set of fields include a reference SCS field (e.g., which may be referred to by a name such as “Ref-SCS-CLI-SRS” or by another name) and a reference frequency field (e.g., which may be referred to by a name such as “Ref-freq-CLI-SRS” or by another name). The reference frequency may correspond to a starting resource block (RB) for the sounding bandwidth of the CLI-SRS, for example. 
     In some aspects, rather than having a reference frequency indicated to the UE, the starting RB of the sounding bandwidth for the CLI-SRS may be indicated or derived in a different manner than a UE specific SRS reference frequency. As an example, a value range of n_shift may cover an entire bandwidth (e.g., a carrier bandwidth of 100 MHz for FR1) for the CLI-SRS. 
     In some aspects, the RRC configuration of the CLI-SRS may include an indication of a reference BWP for derivation of the SCS and the reference frequency. Each UE may then use the reference BWP to derive an SCS and/or reference frequency for the CLI-SRS. In some aspects, the base station may align, e.g., configure the same or overlapping reference BWPs, for different UEs so that the UEs will derive the same SCS or same reference frequency. 
     In some aspects, an active BWP for communication may be the same as a BWP associated with the first set of common resources for the SRS for the CLI measurement and may be associated with a same SCS. An active BWP for communication, in some aspects, may be the same as a BWP associated with the first set of common resources for the SRS for the CLI measurement and may be associated with a different SCS than the first set of common resources. In some aspects, the active BWP for communication may be different than a BWP associated with the first set of common resources for the SRS for the CLI measurement and may be associated with an SCS that is the same as, or that is different from, an SCS associated with the first set of common resources. In aspects in which either (1) an active BWP is different from a BWP associated with the first set of common resources or (2) a SCS associated with the active BWP is different than a SCS associated with the first set of common resources, the SRS configuration  912  may include an indication of a minimum time gap (e.g.,  723 ) between a communication  925  in the active BWP and a SRS transmission or a SRS measurement  922  in the BWP associated with the first set of common resources. Although the illustration of an example time gap  923  in  FIG.  9    is shown between the SRS measurement, at  922 , and the communication  925  following the SRS measurement, a time gap may similarly be between communication prior to the SRS measurement  922  and/or for communication before or after the SRS transmission  914 . 
     In some aspects, a UE (e.g., UEs  904  and  906 ) may skip an uplink transmission or an SRS measurement if a time duration between the uplink transmission and transmission/measurement of the common-SRS is less than a minimum time gap. In some aspects, the SRS measurement may be skipped regardless of a minimum time gap. The minimum time gap may be indicated in the SRS configuration, in some aspects. As an example, the UE may skip one of a common-SRS operation or an UL transmission when the common-SRS operation and the UL transmission are associated with sets of resources that are separated by less than the minimum time gap, where the common-SRS operation includes one of a common-SRS transmission or a common-SRS measurement. In some aspects, which of the common-SRS operation or the UL transmission is skipped may be based on a priority assigned to each of the common-SRS operation or the UL transmission. 
     In some aspects, the SRS configuration  912  indicates a spatial relation for the first set of common resources based on a quasi co-location (QCL) relationship (e.g., QCL type D) to a reference signal for a cell or that is common to the first UE (e.g., UE  904 ) and the second UE (e.g., UE  906 ). The reference signal for the QCL relationship may be a cell level reference signal (e.g., a cell wide RS) such as an SSB or other reference signal that is common to the UEs in the cell. The reference signal for the QCL relationship may be a CSI-RS that is configured for multiple UEs, e.g., the multiple UEs that are intended to transmit/measure CLI with each other. 
     The SRS configuration  912 , in some aspects, may include an indication of a set of common power control parameters associated with the first set of common resources. The indicated power control parameters may include (e.g., reference) power control parameters associated with a UEs PUSCH power control (e.g., have no separate power control loop for the CLI-SRS) or may include separate power control parameters (e.g., an alpha, p0, and pathlossreferenceRS) for a separate power control loop for the CLI-SRS. 
     Based on the SRS configuration  912 , the first UE  904  may transmit, and the UE  906  may receive, a first SRS transmission  914  via a SRS resource configured (1) as a NZP-CLI-SRS resource at the first UE  904  and (2) as a ZP-CLI-SRS resource at the UE  906 . The UE  904  and the UE  906  may identify particular resources as NZP-CLI-SRS or ZP-CLI-SRS based on a UE identifier or other UE-specific value. The UE  906  may then measure, at  916 , the SRS transmission  914  received from the UE  904 . The UE  906  may then transmit a CLI report  918  regarding the SRS transmission from at least the UE  904 . 
     Similarly, the UE  906  may transmit, and the UE  904  may receive, a second SRS transmission  920  via a SRS resource configured (1) as a ZP-CLI-SRS resource at the first UE  904  and (2) as a NZP-CLI-SRS resource at the UE  906 . The UE  904  may then measure, at  922 , the SRS transmission  920  received from the UE  906 . The UE  904  may then transmit a CLI report  924  regarding the SRS transmission from at least the UE  904 . 
     The BS  902  may further transmit, and UEs  908  and  910  may receive, SRS configuration  926  that indicates a second set of group-level (e.g., cell-level or zone-level) SRS resources. The SRS configuration  926  may indicate zero-power (ZP) CLI-SRS resource used by at least one UE for measuring CLI based on SRS received from at least one other UE and non-ZP CLI-SRS resources for transmitting SRS to at least one other UE for CLI measurement at the at least one other UE. The SRS configuration  926  may indicate different ZP-CLI-SRS resources and NZP-CLI-SRS resources for the UE  908  and the UE  910 . For example, the SRS configuration  926  may indicate a particular resource as a ZP-CLI-SRS resource for a third UE (e.g., UE  908 ), while indicating the particular resource as a NZP-CLI-SRS resource for a fourth UE (e.g., UE  910 ), such that the third UE  908  transmits a SRS transmission via the particular resource and the fourth UE  910  receives the SRS transmission for measuring the CLI via the particular resource. 
     Based on the SRS configuration  926 , the third UE  908  may transmit, and the fourth UE  910  may receive, a third SRS transmission  928  via a SRS resource configured (1) as a NZP-CLI-SRS resource at the third UE  908  and (2) as a ZP-CLI-SRS resource at the fourth UE  910 . The third UE  908  and the fourth UE  910  may identify particular resources as NZP-CLI-SRS or ZP-CLI-SRS based on a UE identifier or other UE-specific value. The fourth UE  910  may then measure, at  930 , the SRS transmission  928  received from the third UE  908 . The fourth UE  910  may then transmit a CLI report  932  regarding the SRS transmission from at least the third UE  908 . 
     In some aspects the SRS transmission and measurement may be for sidelink, e.g., for CLI measurements relating to sidelink communication between UEs. The base station  902  may provide a configuration for the CLI-SRS, and one or more UEs may use the CLI-SRS resources to transmit a sidelink SRS transmission and/or to measure interference from an SRS transmission to sidelink communication. Aspects of sidelink communication are described in connection with  FIG.  1    and  FIG.  18   , for example. 
     Aspects presented herein may enable a CLI-SRS configuration that is common to multiple UEs in a cell. In some aspects, the CLI-SRS configuration may be common to each UE in a cell, e.g., a cell wide configuration. In other aspects, the CLI-RS configuration may be common to multiple levels that are a subset of UEs served by the cell. 
       FIG.  10    illustrates example sub-cell-level CLI-SRS configuration implementations. Diagram  1010  illustrates a first base station  1012  in FD communication with two pairs of UEs (e.g., UEs  1014  and  1015  and UEs  1034  and  1035 ). Each pair of UEs (e.g., UEs  1014  and  1015  and UEs  1034  and  1035 ) may experience CLI (e.g., CLI  1020  and CLI  1040 ). Each pair of UEs may be associated with a different synchronization signal block (SSB) index and each SSB index may be associated with a CLI-SRS configuration. Each SSB index may be associated with a beam direction (e.g., beam directions  1050 ,  1060 , or  1070 ) and adjacent beam directions may be associated with different CLI-SRS configurations, while a particular CLI-SRS configuration may be associated with each of a set of non-adjacent beam directions. 
     For example, beam directions  1050  and  1060  may be associated with a same CLI-SRS configuration while beam direction  1070  may be associated with a different CLI-SRS configuration. Each CLI-SRS configuration, in some aspects, includes a plurality of SRS resources to support a plurality of UEs using a same CLI-SRS configuration. The CLI-SRS configuration that is common to UEs  1014  and  1015  and/or common to UEs  1034  and  1035  may allow the UEs to measure CLI  1020  or  1040 . The different CLI-SRS configuration common to UEs associated with beam direction  1070  (UEs not shown) may indicate common SRS resources for CLI measurement at UEs associated with the beam direction  1070 . The CLI-SRS configuration common to UEs associated with beam direction  1070 , in some aspects, may be configured such that the SRS transmissions from UEs associated with beam directions  1050  and  1060  do not interfere with CLI measurements made by UEs associated with beam direction  1070  and vice versa. 
     Similarly, diagram  1080  illustrates a set of common SRS resource configurations (e.g., CLI-SRS Config  1  to CLI-SRS Config  3 ) for a zone-based CLI. For example, an area serviced by a base station  1082  may be divided into zones using one of three (or more) CLI-SRS configurations (e.g., CLI-SRS Config  1  to CLI-SRS Config  3 ). In some aspects, UEs associated with different beam directions (e.g., SSB index values), as in diagram  1010 , or in different zones, as in diagram  1080  may be scheduled by the base station for simultaneous UL and DL transmission/reception. 
       FIG.  11    is a flowchart  1100  of a method of wireless communication. The method may be performed by a base station (e.g., the base station  102 / 180 ,  902 ,  1012 ,  1082 ; the apparatus  1702 ). At  1102 , the base station may transmit, and at least one UE may receive, a configuration of a first set of common resources for a SRS for CLI measurement, the first set of common resources being common to a first plurality of UEs. For example,  1102  may be performed by CLI-SRS configuration component  1740 . The configuration may indicate a sub-carrier spacing of the first set of common resources and a reference frequency associated with the first set of common resources. In some aspects, the configuration includes one of (1) a set of fields in an information element associated with the SRS for the cross-link interference measurement, the set of fields including a reference sub-carrier spacing field and a reference frequency field, (2) an indication of the sub-carrier spacing of the first set of common resources and an indication of a frequency shift associated with the reference frequency, or (3) an indication of a reference BWP for derivation of the sub-carrier spacing and the reference frequency. For example, referring to  FIG.  9   , the base station  902  may transmit, and UE  904  or UE  906  may receive, a SRS configuration  912 . 
     In some aspects, an active BWP for communication may be the same as a BWP associated with the first set of common resources for the SRS for the CLI measurement and may be associated with a same SCS. An active BWP for communication, in some aspects, may be the same as a BWP associated with the first set of common resources for the SRS for the CLI measurement and may be associated with a different SCS than the first set of common resources. In some aspects, the active BWP for communication is different than a BWP associated with the first set of common resources for the SRS for the CLI measurement and may be associated with an SCS that is the same as, or that is different from, an SCS associated with the first set of common resources. In aspects in which either (1) an active BWP is different from a BWP associated with the first set of common resources or (2) a SCS associated with the active BWP is different than a SCS associated with the first set of common resources, the configuration may include an indication of a minimum time gap between a communication in the active BWP and a SRS transmission or a SRS measurement in the BWP associated with the first set of common resources. 
     The configuration may also include an indication for the plurality of UEs to skip one of a common-SRS operation or an UL transmission when the common-SRS operation and the UL transmission are associated with sets of resources that are separated by less than the minimum time gap, where the common-SRS operation includes one of a common-SRS transmission or a common-SRS measurement. In some aspects, the configuration indicates a spatial relation for the set of common resources based on a QCL relationship to a reference signal for a cell or that is common to a first UE and a second UE. The configuration, in some aspects, may include an indication of a set of common power control parameters associated with the first set of common resources. The indicated power control parameters may include (e.g., reference) power control parameters associated with a UEs PUSCH power control (e.g., have no separate power control loop for the CLI-SRS) or may include separate power control parameters (e.g., an alpha, p0, and pathlossreferenceRS) for a separate power control loop for the CLI-SRS. 
     At  1104 , the base station may receive, from a second UE in the first plurality of UEs, a report of the CLI associated with a first UE in the first plurality of UEs and measured via a first resource in the first set of common resources. For example,  1104  may be performed by CLI-SRS report component  1742 . The report of the CLI associated with the first UE in the first plurality of UEs, in some aspects, may be based on a SRS transmitted from the first UE and received at the second UE based on the CLI-SRS configuration transmitted at  1102 . For example, referring to  FIG.  9   , the base station  902  may receive CLI report  918 . 
       FIG.  12    is a flowchart  1200  of a method of wireless communication. The method may be performed by a base station (e.g., the base station  102 / 180 ,  902 ,  1012 ,  1082 ; the apparatus  1702 ). At  1202 , the base station may transmit, and at least one UE may receive, a configuration of a first set of common resources for a SRS for CLI measurement, the first set of common resources being common to a first plurality of UEs. For example,  1202  may be performed by CLI-SRS configuration component  1740 . The configuration may indicate a sub-carrier spacing of the first set of common resources and a reference frequency associated with the first set of common resources. In some aspects, the configuration includes one of (1) a set of fields in an information element associated with the SRS for the cross-link interference measurement, the set of fields including a reference sub-carrier spacing field and a reference frequency field, (2) an indication of the sub-carrier spacing of the first set of common resources and an indication of a frequency shift associated with the reference frequency, or (3) an indication of a reference BWP for derivation of the sub-carrier spacing and the reference frequency. For example, referring to  FIG.  9   , the base station  902  may transmit, and UE  904  or UE  906  may receive, a SRS configuration  912 . 
     In some aspects, an active BWP for communication may be the same as a BWP associated with the first set of common resources for the SRS for the CLI measurement and may be associated with a same SCS. An active BWP for communication, in some aspects, may be the same as a BWP associated with the first set of common resources for the SRS for the CLI measurement and may be associated with a different SCS than the first set of common resources. In some aspects, the active BWP for communication is different than a BWP associated with the first set of common resources for the SRS for the CLI measurement and may be associated with an SCS that is the same as, or that is different from, an SCS associated with the first set of common resources. In aspects in which either (1) an active BWP is different from a BWP associated with the first set of common resources or (2) a SCS associated with the active BWP is different than a SCS associated with the first set of common resources, the configuration may include an indication of a minimum time gap between a communication in the active BWP and a SRS transmission or a SRS measurement in the BWP associated with the first set of common resources. 
     The configuration may also include an indication for the plurality of UEs to skip one of a common-SRS operation or an UL transmission when the common-SRS operation and the UL transmission are associated with sets of resources that are separated by less than the minimum time gap, where the common-SRS operation includes one of a common-SRS transmission or a common-SRS measurement. In some aspects, the configuration indicates a spatial relation for the set of common resources based on a QCL relationship to a reference signal for a cell or that is common to a first UE and a second UE. The configuration, in some aspects, may include an indication of a set of common power control parameters associated with the first set of common resources. The indicated power control parameters may include (e.g., reference) power control parameters associated with a UEs PUSCH power control (e.g., have no separate power control loop for the CLI-SRS) or may include separate power control parameters (e.g., an alpha, p0, and pathlossreferenceRS) for a separate power control loop for the CLI-SRS. 
     At  1204 , the base station may receive, from a second UE in the first plurality of UEs, a report of the CLI associated with a first UE in the first plurality of UEs and measured via a first resource in the first set of common resources. For example,  1204  may be performed by CLI-SRS report component  1742 . The report of the CLI associated with the first UE in the first plurality of UEs, in some aspects, may be based on a SRS transmitted from the first UE and received at the second UE based on the CLI-SRS configuration transmitted at  1202 . For example, referring to  FIG.  9   , the base station  902  may receive CLI report  918 . 
     At  1206 , the base station may transmit, and at least one UE may receive, a configuration of a second set of common resources for a SRS for CLI measurement, the second set of common resources being common to a second plurality of UEs. For example,  1202  may be performed by CLI-SRS configuration component  1740 . The configuration may indicate a sub-carrier spacing of the second set of common resources and a reference frequency associated with the second set of common resources. In some aspects, the configuration includes one of (1) a set of fields in an information element associated with the SRS for the cross-link interference measurement, the set of fields including a reference sub-carrier spacing field and a reference frequency field, (2) an indication of the sub-carrier spacing of the second set of common resources and an indication of a frequency shift associated with the reference frequency, or (3) an indication of a reference BWP for derivation of the sub-carrier spacing and the reference frequency. For example, referring to  FIG.  9   , the base station  902  may transmit, and UE  908  or UE  910  may receive, a SRS configuration  926 . 
     In some aspects, an active BWP for communication may be the same as a BWP associated with the second set of common resources for the SRS for the CLI measurement and may be associated with a same SCS. An active BWP for communication, in some aspects, may be the same as a BWP associated with the second set of common resources for the SRS for the CLI measurement and may be associated with a different SCS than the second set of common resources. In some aspects, the active BWP for communication is different than a BWP associated with the second set of common resources for the SRS for the CLI measurement and may be associated with an SCS that is the same as, or that is different from, an SCS associated with the second set of common resources. In aspects in which either (1) an active BWP is different from a BWP associated with the second set of common resources or (2) a SCS associated with the active BWP is different than a SCS associated with the second set of common resources, the configuration may include an indication of a minimum time gap between a communication in the active BWP and a SRS transmission or a SRS measurement in the BWP associated with the second set of common resources. 
     The configuration may also include an indication for the second plurality of UEs to skip one of a common-SRS operation or an UL transmission when the common-SRS operation and the UL transmission are associated with sets of resources that are separated by less than the minimum time gap, where the common-SRS operation includes one of a common-SRS transmission or a common-SRS measurement. In some aspects, the configuration indicates a spatial relation for the second set of common resources based on a QCL relationship to a reference signal for a cell or that is common to a third UE and a fourth UE. The configuration, in some aspects, may include an indication of a set of common power control parameters associated with the second set of common resources. The indicated power control parameters may include (e.g., reference) power control parameters associated with a UEs PUSCH power control (e.g., have no separate power control loop for the CLI-SRS) or may include separate power control parameters (e.g., an alpha, p0, and pathlossreferenceRS) for a separate power control loop for the CLI-SRS. 
     At  1208 , the base station may receive, from at least one UE in the second plurality of UEs, an additional report of a CLI measured via the second set of common resources. For example,  1208  may be performed by CLI-SRS configuration component  1740 . The additional report of the CLI, in some aspects, may be based on a SRS transmitted from a UE in the second plurality of UEs and received at the at least one UE in the second plurality of UEs based on the CLI-SRS configuration transmitted at  1206 . For example, referring to  FIG.  9   , the base station  902  may receive CLI report  932 . 
       FIG.  13    is a flowchart  1300  of a method of wireless communication. The method may be performed by a UE (e.g., the UE  104 ,  904 ,  906 ,  908 ,  910 ,  1014 ,  1015 ,  1034 ,  1035 ; the apparatus  1602 ). At  1302 , the UE may receive, from a base station, a configuration indicating a set of common resources for a SRS for CLI measurement between UEs. For example,  1302  may be performed by CLI-SRS configuration component  1640 . The configuration may indicate a sub-carrier spacing of the first set of common resources and a reference frequency associated with the first set of common resources. In some aspects, the configuration includes one of (1) a set of fields in an information element associated with the SRS for the cross-link interference measurement, the set of fields including a reference sub-carrier spacing field and a reference frequency field, (2) an indication of the sub-carrier spacing of the first set of common resources and an indication of a frequency shift associated with the reference frequency, or (3) an indication of a reference BWP for derivation of the sub-carrier spacing and the reference frequency. For example, referring to  FIG.  9   , the UE  904  may receive, a SRS configuration  912  from base station  902 . 
     In some aspects, an active BWP for communication may be the same as a BWP associated with the first set of common resources for the SRS for the CLI measurement and may be associated with a same SCS. An active BWP for communication, in some aspects, may be the same as a BWP associated with the first set of common resources for the SRS for the CLI measurement and may be associated with a different SCS than the first set of common resources. In some aspects, the active BWP for communication is different than a BWP associated with the first set of common resources for the SRS for the CLI measurement and may be associated with an SCS that is the same as, or that is different from, an SCS associated with the first set of common resources. In aspects in which either (1) an active BWP is different from a BWP associated with the first set of common resources or (2) a SCS associated with the active BWP is different than a SCS associated with the first set of common resources, the configuration may include an indication of a minimum time gap between a communication in the active BWP and a SRS transmission or a SRS measurement in the BWP associated with the first set of common resources. 
     The configuration may also include an indication for the plurality of UEs to skip one of a common-SRS operation or an UL transmission when the common-SRS operation and the UL transmission are associated with sets of resources that are separated by less than the minimum time gap, where the common-SRS operation includes one of a common-SRS transmission or a common-SRS measurement. In some aspects, the configuration indicates a spatial relation for the set of common resources based on a QCL relationship to a reference signal for a cell or that is common to a first UE and a second UE. The configuration, in some aspects, may include an indication of a set of common power control parameters associated with the first set of common resources. The indicated power control parameters may include (e.g., reference) power control parameters associated with a UEs PUSCH power control (e.g., have no separate power control loop for the CLI-SRS) or may include separate power control parameters (e.g., an alpha, p0, and pathlossreferenceRS) for a separate power control loop for the CLI-SRS. 
     At  1304 , the UE may transmit a first SRS in a first resource in the set of common resources to other UEs in the first plurality of UEs. For example,  1304  may be performed by CLI-SRS transmission component  1642 . The first SRS transmission may be received at another UE for measuring CLI between the UE and the other UE based on the configuration received, at  1302 , from the base station. For example, referring to  FIG.  9   , the UE  904  may transmit SRS transmission  914 . 
       FIG.  14    is a flowchart  1400  of a method of wireless communication. The method may be performed by a UE (e.g., the UE  104 ,  904 ,  906 ,  908 ,  910 ,  1014 ,  1015 ,  1034 ,  1035 ; the apparatus  1602 ). At  1402 , the UE may receive, from a base station, a configuration indicating a set of common resources for a SRS for CLI measurement between UEs. For example,  1402  may be performed by CLI-SRS configuration component  1640 . The configuration may indicate a sub-carrier spacing of the first set of common resources and a reference frequency associated with the first set of common resources. In some aspects, the configuration includes one of (1) a set of fields in an information element associated with the SRS for the cross-link interference measurement, the set of fields including a reference sub-carrier spacing field and a reference frequency field, (2) an indication of the sub-carrier spacing of the first set of common resources and an indication of a frequency shift associated with the reference frequency, or (3) an indication of a reference BWP for derivation of the sub-carrier spacing and the reference frequency. For example, referring to  FIG.  9   , the UE  906  may receive, a SRS configuration  912  from base station  902 . 
     In some aspects, an active BWP for communication may be the same as a BWP associated with the first set of common resources for the SRS for the CLI measurement and may be associated with a same SCS. An active BWP for communication, in some aspects, may be the same as a BWP associated with the first set of common resources for the SRS for the CLI measurement and may be associated with a different SCS than the first set of common resources. In some aspects, the active BWP for communication is different than a BWP associated with the first set of common resources for the SRS for the CLI measurement and may be associated with an SCS that is the same as, or that is different from, an SCS associated with the first set of common resources. In aspects in which either (1) an active BWP is different from a BWP associated with the first set of common resources or (2) a SCS associated with the active BWP is different than a SCS associated with the first set of common resources, the configuration may include an indication of a minimum time gap between a communication in the active BWP and a SRS transmission or a SRS measurement in the BWP associated with the first set of common resources. 
     The configuration may also include an indication for the plurality of UEs to skip one of a common-SRS operation or an UL transmission when the common-SRS operation and the UL transmission are associated with sets of resources that are separated by less than the minimum time gap, where the common-SRS operation includes one of a common-SRS transmission or a common-SRS measurement. In some aspects, the configuration indicates a spatial relation for the set of common resources based on a QCL relationship to a reference signal for a cell or that is common to a first UE and a second UE. The configuration, in some aspects, may include an indication of a set of common power control parameters associated with the first set of common resources. The indicated power control parameters may include (e.g., reference) power control parameters associated with a UEs PUSCH power control (e.g., have no separate power control loop for the CLI-SRS) or may include separate power control parameters (e.g., an alpha, p0, and pathlossreferenceRS) for a separate power control loop for the CLI-SRS. 
     At  1404 , the UE may measure a CLI from a SRS transmission received from a first UE via a first resource in the first set of common resources. For example,  1404  may be performed by CLI-SRS reporting component  1644 . The SRS transmission received from the first UE may be via a ZP-CLI-SRS resource for the UE indicated in the configuration received at  1402 . Measuring, at  1404 , the CLI may include measuring a reference signal received power (RSRP) or other measure of signal strength that is relevant to measuring interference at the UE. For example, referring to  FIG.  9   , the UE  906  may measure, at  916  the SRS transmission  914  transmitted by the UE  904  based on the SRS configuration  912  transmitted by the base station  902  and received at the UEs  904  and  906 . 
     Finally, at  1406 , the UE may transmit, to the base station, a report of the measured CLI. For example,  1406  may be performed by CLI-SRS reporting component  1644 . The CLI report transmitted at  1406 , may indicate a level of CLI from one or more UEs in the first plurality of UEs associated with the set of common resources. For example, referring to  FIG.  9   , the UE  906  may transmit CLI report  918  to the base station  902 . 
       FIG.  15    is a flowchart  1500  of a method of wireless communication. The method may be performed by a UE (e.g., the UE  104 ,  904 ,  906 ,  908 ,  910 ,  1014 ,  1015 ,  1034 ,  1035 ; the apparatus  1602 ). At  1502 , the UE may receive, from a base station, a configuration indicating a set of common resources for a SRS for CLI measurement between UEs. For example,  1502  may be performed by CLI-SRS configuration component  1640 . The configuration may indicate a sub-carrier spacing of the first set of common resources and a reference frequency associated with the first set of common resources. In some aspects, the configuration includes one of (1) a set of fields in an information element associated with the SRS for the cross-link interference measurement, the set of fields including a reference sub-carrier spacing field and a reference frequency field, (2) an indication of the sub-carrier spacing of the first set of common resources and an indication of a frequency shift associated with the reference frequency, or (3) an indication of a reference BWP for derivation of the sub-carrier spacing and the reference frequency. For example, referring to  FIG.  9   , the UE  906  may receive, a SRS configuration  912  from base station  902 . 
     In some aspects, an active BWP for communication may be the same as a BWP associated with the first set of common resources for the SRS for the CLI measurement and may be associated with a same SCS. An active BWP for communication, in some aspects, may be the same as a BWP associated with the first set of common resources for the SRS for the CLI measurement and may be associated with a different SCS than the first set of common resources. In some aspects, the active BWP for communication is different than a BWP associated with the first set of common resources for the SRS for the CLI measurement and may be associated with an SCS that is the same as, or that is different from, an SCS associated with the first set of common resources. In aspects in which either (1) an active BWP is different from a BWP associated with the first set of common resources or (2) a SCS associated with the active BWP is different than a SCS associated with the first set of common resources, the configuration may include an indication of a minimum time gap between a communication in the active BWP and a SRS transmission or a SRS measurement in the BWP associated with the first set of common resources. 
     The configuration may also include an indication for the plurality of UEs to skip one of a common-SRS operation or an UL transmission when the common-SRS operation and the UL transmission are associated with sets of resources that are separated by less than the minimum time gap, where the common-SRS operation includes one of a common-SRS transmission or a common-SRS measurement. In some aspects, the configuration indicates a spatial relation for the set of common resources based on a QCL relationship to a reference signal for a cell or that is common to a first UE and a second UE. The configuration, in some aspects, may include an indication of a set of common power control parameters associated with the first set of common resources. The indicated power control parameters may include (e.g., reference) power control parameters associated with a UEs PUSCH power control (e.g., have no separate power control loop for the CLI-SRS) or may include separate power control parameters (e.g., an alpha, p0, and pathlossreferenceRS) for a separate power control loop for the CLI-SRS. 
     At  1504 , the UE may measure a CLI from a SRS transmission received from a first UE via a first resource in the first set of common resources. For example,  1504  may be performed by CLI-SRS reporting component  1644 . The SRS transmission received from the first UE may be via a ZP-CLI-SRS resource for the UE indicated in the configuration received at  1502 . Measuring, at  1504 , the CLI may include measuring a reference signal received power (RSRP) or other measure of signal strength that is relevant to measuring interference at the UE. For example, referring to  FIG.  9   , the UE  906  may measure, at  916  the SRS transmission  914  transmitted by the UE  904  based on the SRS configuration  912  transmitted by the base station  902  and received at the UEs  904  and  906 . 
     At  1506 , the UE may transmit, to the base station, a report of the measured CLI. For example,  1506  may be performed by CLI-SRS reporting component  1644 . The CLI report transmitted at  1506 , may indicate a level of CLI from one or more UEs in the first plurality of UEs associated with the set of common resources. For example, referring to  FIG.  9   , the UE  906  may transmit CLI report  918  to the base station  902 . 
     Finally, at  1508 , the UE may transmit a second SRS via a second resource in the set of common resources for measurement of the cross-link interference from the second UE at one or more other UEs in the first plurality of UEs. For example,  1508  may be performed by CLI-SRS transmission component  1642 . The second SRS transmission may be received at another UE for measuring CLI between the second UE and the other UE based on the configuration received, at  1502 , from the base station. For example, referring to  FIG.  9   , the UE  906  may transmit SRS transmission  920 . 
       FIG.  16    is a diagram  1600  illustrating an example of a hardware implementation for an apparatus  1602 . The apparatus  1602  may be a UE, a component of a UE, or may implement UE functionality. In some aspects, the apparatus  1602  may include a cellular baseband processor  1604  (also referred to as a modem) coupled to a cellular RF transceiver  1622 . In some aspects, the apparatus  1602  may further include one or more subscriber identity modules (SIM) cards  1620 , an application processor  1606  coupled to a secure digital (SD) card  1608  and a screen  1610 , a Bluetooth module  1612 , a wireless local area network (WLAN) module  1614 , a Global Positioning System (GPS) module  1616 , or a power supply  1618 . The cellular baseband processor  1604  communicates through the cellular RF transceiver  1622  with the UE  104  and/or BS  102 / 180 . The cellular baseband processor  1604  may include a computer-readable medium/memory. The computer-readable medium/memory may be non-transitory. The cellular baseband processor  1604  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  1604 , causes the cellular baseband processor  1604  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  1604  when executing software. The cellular baseband processor  1604  further includes a reception component  1630 , a communication manager  1632 , and a transmission component  1634 . The communication manager  1632  includes the one or more illustrated components. The components within the communication manager  1632  may be stored in the computer-readable medium/memory and/or configured as hardware within the cellular baseband processor  1604 . The cellular baseband processor  1604  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  1602  may be a modem chip and include just the baseband processor  1604 , and in another configuration, the apparatus  1602  may be the entire UE (e.g., see  350  of  FIG.  3   ) and include the additional modules of the apparatus  1602 . 
     The communication manager  1632  includes a CLI-SRS configuration component  1640  that is configured to receive, from a base station, a configuration indicating a set of common resources for a SRS for CLI measurement between UEs, e.g., as described in connection with  1302 ,  1402 ,  1502  of  FIGS.  13 - 15   . The communication manager  1632  further includes a CLI-SRS transmission component  1642  that receives input in the form of a CLI-SRS configuration from the CLI-SRS configuration component  1640  and is configured to transmit a SRS in a resource in the set of common resources to other UEs in the first plurality of UEs, e.g., as described in connection with  1304  and  1508  of  FIGS.  13  and  15   . The communication manager  1632  further includes a CLI-SRS reporting component  1644  that receives input in the form of a CLI-SRS configuration from the CLI-SRS configuration component  1640  and is configured to measure a CLI from a SRS transmission received from another UE via a resource in the first set of common resources and to transmit, to the base station, a report of the measured CLI, e.g., as described in connection with  1404 ,  1406 ,  1504 , and  1506  of  FIGS.  14  and  15   . 
     The apparatus may include additional components that perform each of the blocks of the algorithm in the flowcharts of  FIGS.  13 - 15   . As such, each block in the flowcharts of  FIGS.  13 - 15    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  1602  may include a variety of components configured for various functions. In one configuration, the apparatus  1602 , and in particular the cellular baseband processor  1604 , includes means for receiving, from a base station, a configuration indicating a set of common resources for a SRS for cross-link interference measurement between UEs. The apparatus  1602 , and in particular the cellular baseband processor  1604 , may further includes means for transmitting a first SRS in a first resource in the set of common resources. The apparatus  1602 , and in particular the cellular baseband processor  1604 , may further includes means for measuring a cross-link interference from a SRS transmission received from a first UE via the first resource in the first set of common resources. The apparatus  1602 , and in particular the cellular baseband processor  1604 , may further includes means for transmitting, to the base station, a report of the measured cross-link interference. The apparatus  1602 , and in particular the cellular baseband processor  1604 , may further includes means for transmitting a second SRS via a second resource in the first set of common resources for measurement of the cross-link interference from the second UE. The means may be one or more of the components of the apparatus  1602  configured to perform the functions recited by the means. As described supra, the apparatus  1602  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.  17    is a diagram  1700  illustrating an example of a hardware implementation for an apparatus  1702 . The apparatus  1702  may be a base station, a component of a base station, or may implement base station functionality. In some aspects, the apparatus  1602  may include a baseband unit  1704 . The baseband unit  1704  may communicate through a cellular RF transceiver  1722  with the UE  104 . The baseband unit  1704  may include a computer-readable medium/memory. The baseband unit  1704  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  1704 , causes the baseband unit  1704  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  1704  when executing software. The baseband unit  1704  further includes a reception component  1730 , a communication manager  1732 , and a transmission component  1734 . The communication manager  1732  includes the one or more illustrated components. The components within the communication manager  1732  may be stored in the computer-readable medium/memory and/or configured as hardware within the baseband unit  1704 . The baseband unit  1704  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  1732  includes a CLI-SRS configuration component  1740  that may configure a first set of common resources and transmit, to at least one UE, a configuration of a first set of common resources for a SRS for CLI measurement, the first set of common resources being common to a first plurality of UEs, e.g., as described in connection with  1102 ,  1202 , and  1206  of  FIGS.  11  and  12   . The communication manager  1732  further includes a CLI-SRS report component  1742  that may receive, from a second UE in the first plurality of UEs, a report of the CLI associated with a first UE in the first plurality of UEs and measured via a first resource in the first set of common resources, e.g., as described in connection with  1104 ,  1204 , and  1208  of  FIGS.  11  and  12   . 
     The apparatus may include additional components that perform each of the blocks of the algorithm in the flowcharts of  FIGS.  11  and  12   . As such, each block in the flowcharts of  FIGS.  11  and  12    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  1702  may include a variety of components configured for various functions. In one configuration, the apparatus  1702 , and in particular the baseband unit  1704 , includes means for transmitting a configuration of a first set of common resources for a SRS) for cross-link interference measurement, the first set of common resources being common to a first plurality of UEs. The apparatus  1702 , and in particular the baseband unit  1704 , may further include means for receiving, from a second UE in the first plurality of UEs, a report of the cross-link interference associated with a first UE in the first plurality of UEs and measured via a first resource in the first set of common resources. The apparatus  1702 , and in particular the baseband unit  1704 , may further include means for transmitting a second configuration of a second set of common resources for the SRS for the cross-link interference measurement, the second set of common resources being common to a second plurality of UEs. The apparatus  1702 , and in particular the baseband unit  1704 , may further include means for receiving from at least one UE in the second plurality of UEs an additional report of a cross-link interference measured via the second set of common resources. The means may be one or more of the components of the apparatus  1702  configured to perform the functions recited by the means. As described supra, the apparatus  1702  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. 
     In some aspects of wireless communication, CLI-SRS resources are configured by a base station for each of a plurality of UEs served by the base station. In order to measure CLI, CLI-SRS resources, in some aspects, are aligned for different UEs in the plurality of UEs. A base station may align a zero-power (ZP) CLI-SRS at a first UE with a non-ZP-CLI-SRS (e.g., a SRS transmission) at a second UE. Some aspects provide group-based (e.g., cell level, zone-based, or aggressor-based) CLI-SRS configurations that reduce management overhead associated with aligning CLI-SRS resources at different UEs independently. The group-based CLI-SRS resources may be used in association with communication between a UE and a base station or in association with sidelink communication. 
     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 an apparatus for wireless communication including at least one processor coupled to a memory and configured to transmit a configuration of a first set of common resources for a SRS for cross-link interference measurement, the first set of common resources being common to a first plurality of UEs; and receive, from a second UE in the first plurality of UEs, a report of the cross-link interference associated with a first UE in the first plurality of UEs and measured via a first resource in the first set of common resources. 
     Aspect 2 is the apparatus of aspect 1, where the configuration indicates a sub-carrier spacing of the first set of common resources and a reference frequency associated with the first set of common resources. 
     Aspect 3 is the apparatus of aspect 2, where the configuration includes one of a set of fields in an information element associated with the SRS for the cross-link interference measurement, the set of fields including a reference sub-carrier spacing field and a reference frequency field, a first indication of the sub-carrier spacing of the first set of common resources and an indication of a frequency shift associated with the reference frequency, or a second indication of a reference BWP for derivation of the sub-carrier spacing and the reference frequency. 
     Aspect 4 is the apparatus of any of aspects 1 to 3, where an active BWP for communication is different than a BWP associated with the first set of common resources for the SRS for the cross-link interference measurement. 
     Aspect 5 is the apparatus of aspect 4, where the configuration of the first set of common resources further includes a first indication of a minimum time gap between a communication in the active BWP and a SRS transmission or a SRS measurement in the BWP associated with the first set of common resources. 
     Aspect 6 is the apparatus of aspect 5, where the configuration of the first set of common resources further includes a second indication for the plurality of UEs to skip one of a common-SRS operation or an UL transmission when the common-SRS operation and the UL transmission are associated with sets of resources that are separated by less than the minimum time gap, where the common-SRS operation includes one of a common-SRS transmission or a common-SRS measurement. 
     Aspect 7 is the apparatus of any of aspects 1 to 6, where the configuration of the first set of common resources indicates a spatial relation for the first set of common resources based on a QCL relationship to a reference signal for a cell or that is common to the first UE and the second UE. 
     Aspect 8 is the apparatus of any of aspects 1 to 7, where the configuration of the first set of common resources includes an indication of a set of common power control parameters associated with the first set of common resources. 
     Aspect 9 is the apparatus of any of aspects 1 to 8, where the first set of common resources is for a first plurality of UEs, the at least one processor coupled to the memory further configured to transmit a second configuration of a second set of common resources for the SRS for the cross-link interference measurement, the second set of common resources being common to a second plurality of UEs; and receive from at least one UE in the second plurality of UEs an additional report of a cross-link interference measured via the second set of common resources. 
     Aspect 10 is the apparatus of aspect 9, where the first plurality of UEs are associated with one of a first zone or a first SSB index and the second plurality of UEs are associated with one of a second zone or a second SSB index. 
     Aspect 11 is the apparatus of any of aspects 1 to 10, further including a transceiver coupled to the at least one processor. 
     Aspect 12 is an apparatus for wireless communication including at least one processor coupled to a memory and configured to receive, from a base station, a configuration indicating a set of common resources for a SRS for cross-link interference measurement between UEs; and transmitting a first SRS in a first resource in the set of common resources. 
     Aspect 13 is the apparatus of aspect 12, where the configuration indicates a sub-carrier spacing of the set of common resources and a reference frequency associated with the set of common resources. 
     Aspect 14 is the apparatus of aspect 13, where the configuration of the set of common resources includes one of a set of fields in an information element associated with the SRS for the cross-link interference measurement, the set of fields including a reference sub-carrier spacing field and a reference frequency field, a first indication of the sub-carrier spacing of the set of common resources and an indication of a frequency shift associated with the reference frequency, or a second indication of a reference BWP for derivation of the sub-carrier spacing and the reference frequency. 
     Aspect 15 is the apparatus of any of aspects 12 to 14, where an active BWP used for communication by the first UE is different than a BWP associated with the set of common resources for the SRS for the cross-link interference measurement. 
     Aspect 16 is the apparatus of aspect 15, where the configuration of the set of common resources further includes a first indication of a minimum time gap between a communication associated with the active BWP and a SRS transmission in the BWP associated with the set of common resources. 
     Aspect 17 is the apparatus of aspect 16, where the configuration of the set of common resources further includes a second indication for the first UE to skip one of a common-SRS operation or an UL transmission when the common-SRS operation and the UL transmission are associated with sets of resources that are separated by less than the minimum time gap, where the common-SRS operation includes one of a common-SRS transmission or a common-SRS measurement. 
     Aspect 18 is the apparatus of any of aspects 12 to 17, where the configuration of the first set of common resources indicates a spatial relation for the first set of common resources based on a QCL relationship to a reference signal for a cell or that is common to the first UE and the second UE. 
     Aspect 19 is the apparatus of any of aspects 12 to 18, where the configuration indicates a set of common power control parameters associated with the set of common resources. 
     Aspect 20 is the apparatus of any of aspects 12 to 19, further including a transceiver coupled to the at least one processor. 
     Aspect 21 is an apparatus for wireless communication including at least one processor coupled to a memory and configured to receive, from a base station, a configuration of a first set of common resources for a SRS for cross-link interference measurement between UEs; measure a cross-link interference from a SRS transmission received from a first UE via a first resource in the first set of common resources; and transmitting, to the base station, a report of the measured cross-link interference. 
     Aspect 22 is the apparatus of aspect 21, where the configuration indicates a sub-carrier spacing of the first set of common resources and a reference frequency associated with the first set of common resources. 
     Aspect 23 is the apparatus of aspect 22, where the configuration of the first set of common resources indicates one of a set of fields in an information element associated with the SRS for the cross-link interference measurement, the set of fields including a reference sub-carrier spacing field and a reference frequency field, a first indication of the sub-carrier spacing of the first set of common resources and an indication of a frequency shift associated with the reference frequency, or a second indication of a reference BWP for derivation of the sub-carrier spacing and the reference frequency. 
     Aspect 24 is the apparatus of any of aspects 21 to 23, where an active BWP used for communication by the second UE is different than a BWP associated with the first set of common resources for the SRS for the cross-link interference measurement. 
     Aspect 25 is the apparatus of aspect 24, where the configuration of the set of common resources further includes a first indication of a minimum time gap between a communication associated with the active BWP and a SRS measurement in the BWP associated with the first set of common resources; and a second indication for the second UE to skip the cross-link interference measurement in the BWP or an UL transmission when the cross-link interference measurement and the UL transmission are associated with sets of resources that are separated by less than the minimum time gap. 
     Aspect 26 is the apparatus of any of aspects 21 to 25, where the configuration indicates a spatial relation for the first set of common resources based on a QCL relationship to a reference signal for a cell or that is common to the first UE and the second UE. 
     Aspect 27 is the apparatus of any of aspects 21 to 26, where the configuration the first set of common resources includes an indication of a set of common power control parameters associated with the first set of common resources. 
     Aspect 28 is the apparatus of any of aspects 21 to 27, the at least one processor coupled to the memory further configured to transmit a second SRS via a second resource in the first set of common resources for measurement of the cross-link interference from the second UE. 
     Aspect 29 is the apparatus of any of aspects 21 to 28, further including a transceiver coupled to the at least one processor. 
     Aspect 30 is a method of wireless communication for implementing any of aspects 1 to 29. 
     Aspect 31 is an apparatus for wireless communication including means for implementing any of aspects 1 to 29. 
     Aspect 32 is a computer-readable medium storing computer executable code, where the code when executed by a processor causes the processor to implement any of aspects 1 to 29.