Cross-interface interference management

Abstract

An apparatus can be configured to transmit a set of reference signals on a shared resource of a first communication link and a second communication link, the set of reference signals indicating an interference channel on the shared resource. The apparatus can further communicate data or control information on the first communication link after the transmission of the set of reference signals. Another apparatus can be configured to detect a signal on a shared resource of a first communication link and a second communication link, the signal indicating an interference channel on the shared resource. The other apparatus can further perform a channel estimation of the interference channel based on detecting the signal. The other apparatus can further communicate data or control information on the first communication link based on the channel estimation of the interference channel.

Description

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application claims priority from U.S. Provisional Application No. 63 / 055,831, filed on July 23, 2020, entitled “INTERFERENCE MANAGEMENT ON DIFFERENT INTERFACES BASED ON MULTIPLE-INPUT MULTIPLE-OUTPUT (MIMO) CONFIGURATIONS,” U.S. Provisional Application No. 63 / 058,468, filed on July 29, 2020, entitled “INTERFERENCE MANAGEMENT ON DIFFERENT INTERFACES BASED ON MULTIPLE-INPUT MULTIPLE-OUTPUT (MIMO) CONFIGURATIONS,” and U.S. Provisional Application No. 63 / 058,468, filed on July 16, 2021, entitled “CROSS-INTERFACE INTERFERENCE MANAGEMENT" the disclosures of which are expressly incorporated herein by reference in their entirety. background Technical Field

[0004] The present disclosure relates generally to communication systems, and more particularly to the management of interfering channels formed by independent transmitter and receiver pairs that may communicate over the same or different interfaces.

[0005] introduction

[0006] Wireless communication systems are widely deployed to provide a variety of telecommunication services, such as telephony, video, data, messaging, and broadcasts. Typical wireless communication systems 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), time division multiple access (TDMA), frequency division multiple access (FDMA), orthogonal frequency division multiple access (OFDMA), single-carrier frequency division multiple access (SC-FDMA), and time division synchronous code division multiple access (TD-SCDMA).

[0007] These multiple access technologies have been adopted in various telecommunication standards to provide a common protocol that enables different wireless devices to communicate at a city, country, region, and even global level. An example telecommunication standard is 5G New Radio (NR). 5G NR is part of the continuous mobile broadband evolution promulgated by the Third Generation Partnership Project (3GPP) to meet new requirements associated with latency, reliability, security, scalability (e.g., with the 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 is a need for further improvements to 5G NR technology. These improvements may also be applicable to other multiple access technologies and telecommunication standards that employ these technologies.

[0008] Overview

[0009] The following is a brief summary of one or more aspects to provide a basic understanding of such aspects. This summary is not an exhaustive overview of all conceivable aspects and is neither intended to identify key or critical elements of all aspects nor to define 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.

[0010] In some environments, various wireless communication devices within range of each other may engage in different types of communications. For example, an example radio access network (RAN) environment may include devices configured to communicate using various technologies, including access network or network infrastructure technologies and direct device or sidelink technologies. Example technologies may be associated with communication and / or network interfaces. To communicate according to a particular technology, a device may implement an interface corresponding thereto.

[0011] For example, in 5G New Radio (NR) and other radio access technologies (RATs), the communication link between a base station and a user equipment (UE) in the RAN may be over a RAN or network infrastructure interface, such as a Uu interface. However, the UE may additionally or alternatively be configured for direct device communication over a direct communication link or a dedicated short range communication (DRSC) link. In the context of 5G NR, such direct communication and / or DRSC links may avoid network infrastructure and / or may be connectionless and may therefore occur over an interface other than the Uu interface, such as a PC5 interface or a sidelink interface.

[0012] Different communication links, whether on the same or different interfaces, can share RAN resources because the available system bandwidth can be constrained to certain frequency bands or sets of frequency bands, and various timing structures can be well defined and coordinated. For example, resources can be shared between two different UEs on two communication links on the same interface or different interfaces. As an example, resources can be shared between two UEs configured on two direct communication links, respectively. In another example, resources can be shared between a UE configured on a direct communication link and another UE configured on a cellular communication link.

[0013] Due to this resource sharing, communication links on the same and / or different interfaces may cause interference to each other. Accordingly, there is a need for improved management of interfering channels generated by different transmitter and receiver pairs that are in proximity to each other in a wireless environment.

[0014] This disclosure describes techniques and solutions for mitigating interference when resources are shared between communication links on the same or different interfaces. For example, this disclosure describes in detail multiple-input multiple-output (MIMO) techniques for interference nulling when the same resources are used for communication links on the same and / or different interfaces. Many of the techniques and solutions described herein can be implemented individually and can also be combined to reduce interference to shared resources of communication links on the same and / or different interfaces.

[0015] In one aspect of the present disclosure, a method, computer-readable medium, and apparatus are provided. The apparatus may be implemented at a UE, a base station, or a component thereof. The apparatus may be configured to transmit a reference signal set on a shared resource of a first communication link and a second communication link, the reference signal set indicating an interfering channel on the shared resource. The apparatus may be further configured to communicate data or control information on the first communication link after transmitting the reference signal set.

[0016] In another aspect of the present disclosure, another method, another computer-readable medium, and another device are provided. The another device can be implemented at a UE, a base station, or a component thereof. The another device can be configured to detect a signal on a shared resource of a first communication link and a second communication link, the signal indicating an interfering channel on the shared resource. The another device can be further configured to perform channel estimation on the interfering channel based on the detection of the signal. The another device can be further configured to communicate data or control information on the first communication link based on the channel estimate of the interfering channel.

[0017] In a third aspect of the present disclosure, a third method, a third computer-readable medium, and a third apparatus are provided. The third apparatus may be implemented at a base station or a component thereof. The third apparatus may be configured to configure a UE to communicate a reference signal set based on an interfering channel, the interfering channel comprising shared resources of a first communication link and a second communication link. The third apparatus may be further configured to communicate data or control information on the first communication link after configuring the communication performed by the UE.

[0018] To accomplish the foregoing and related ends, one or more aspects comprise the features hereinafter fully described and particularly pointed out in the claims. The following description and accompanying drawings set forth in detail certain illustrative features of the one or more aspects. However, these features are indicative of but a few of the various ways in which the principles of the various aspects may be employed, and this description is intended to encompass all such aspects and their equivalents. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 is a diagram illustrating an example of a wireless communication system and an access network.

[0021] Figure 2A is a diagram illustrating an example of a first frame according to various aspects of the present disclosure.

[0022] Figure 2B is a diagram illustrating an example of downlink channels within a subframe according to various aspects of the present disclosure.

[0023] Figure 2C is a diagram illustrating an example of a second frame according to various aspects of the present disclosure.

[0024] Figure 2D is a diagram illustrating an example of uplink channels within a subframe according to various aspects of the present disclosure.

[0025] Figure 3 is a diagram illustrating an example of a base station and a user equipment (UE) in an access network.

[0026] Figure 4 is an illustration of an example wireless communication environment.

[0027] Figure 5 is an illustration of another example wireless communication environment.

[0028] Figure 6 The present invention is a flowchart of a method for performing wireless communication by a wireless communication device.

[0029] Figure 7 is a flow chart of a method for performing wireless communication by a UE.

[0030] Figure 8is a flow chart of a method for performing wireless communication by a base station.

[0031] Figure 9 is a diagram illustrating an example of a hardware implementation for an example device.

[0032] Figure 10 is a diagram illustrating another example of a hardware implementation for another example device.

[0033] Detailed description

[0034] The detailed description set forth below in conjunction with the accompanying 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. This detailed description includes specific details to provide a thorough understanding of the various concepts. However, those skilled in the art will recognize that these concepts and related aspects may be practiced without these specific details. In some instances, well-known structures and components are shown in block diagram form to avoid obscuring such concepts.

[0035] Several aspects of telecommunications systems will now be presented with reference to various apparatus and methods. These apparatus and methods are described in the following detailed description and illustrated in the accompanying drawings by various blocks, components, circuits, processes, algorithms, etc. (collectively, "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 on the specific application and the design constraints imposed on the overall system.

[0036] As an example, an element, or any part of an element, or any combination of elements can be implemented as a "processing system" comprising one or more processors. Examples of processors include: a microprocessor, a microcontroller, a graphics processing unit (GPU), a central processing unit (CPU), an application processor, a digital signal processor (DSP), a reduced instruction set computing (RISC) processor, a system on a chip (SoC), a baseband processor, a field programmable gate array (FPGA), a programmable logic device (PLD), a state machine, a gating logic, a discrete hardware circuit, and other suitable hardware configured to perform the various functionalities described throughout this disclosure. One or more processors in a processing system can execute software. Software should be broadly interpreted to mean instructions, instruction sets, computer executable code, code segments, program codes, programs, subroutines, software components, applications, software applications, software packages, routines, subroutines, objects, executables, threads of execution, procedures, functions, etc., whether it is described in software, firmware, middleware, microcode, hardware description language, or other terms.

[0037] Accordingly, in one or more example embodiments, the functions described can be implemented in hardware, software, or any combination thereof. If implemented in software, each function can be stored or encoded as one or more instructions or computer executable code on a computer-readable medium. Computer-readable media include computer storage media. Storage media can be any available medium that can be accessed by a computer. As an example and not limitation, such computer-readable media may include random access memory (RAM), read-only memory (ROM), electrically erasable programmable ROM (EEPROM), optical disk storage, magnetic disk storage, other magnetic storage devices, a combination of the above-mentioned types of computer-readable media, or any other medium that can be used to store computer-accessible instructions or data structure forms of computer executable code.

[0038] Figure 1 1 is a diagram illustrating an example of a wireless communication system and access network 100. The wireless communication system (also known as a wireless wide area network (WWAN)) includes a base station 102, user equipment (UE) 104, an evolved packet core (EPC) 160, and another core network 190 (e.g., a 5G core (5GC)). The base station 102 may include a macro cell (a high-power cellular base station) and / or a small cell (a low-power cellular base station). A macro cell includes a base station. Small cells include femto cells, pico cells, and micro cells.

[0039] Base stations 102 configured for 4G Long Term Evolution (LTE), collectively referred to as the Evolved Universal Mobile Telecommunications System (UMTS) Terrestrial Radio Access Network (E-UTRAN), can interface with the EPC 160 via a first backhaul link 132 (e.g., an S1 interface). Base stations 102 configured for 5G New Radio (NR), collectively referred to as the Next Generation Radio Access Network (RAN) (NG-RAN), can interface with the core network 190 via a second backhaul link 184. Among other functions, the base stations 102 can perform one or more of the following: delivery of user data, radio channel encryption and decryption, integrity protection, header compression, mobility control functions (e.g., handover, dual connectivity), inter-cell interference coordination, connection establishment and release, load balancing, distribution of non-access stratum (NAS) messages, NAS node selection, synchronization, RAN sharing, Multimedia Broadcast Multicast Service (MBMS), subscriber and equipment tracking, RAN Information Management (RIM), paging, positioning, and delivery of alert messages.

[0040] In some aspects, the base stations 102 may communicate with each other directly or indirectly (e.g., via the EPC 160 or the core network 190) over a third backhaul link 134 (e.g., an X2 interface). The first backhaul link 132, the second backhaul link 184, and the third backhaul link 134 may be wired or wireless. At least some of the base stations 102 may be configured for integrated access and backhaul (IAB). Thus, such base stations may communicate wirelessly with other such base stations. For example, at least some of the base stations 102 configured for IAB may have a split architecture that includes at least one of a central unit (CU), a distributed unit (DU), a radio unit (RU), a remote radio head (RRH), and / or a remote unit, some or all of which may be co-located or distributed and / or may communicate with each other. In some configurations of such a split architecture, the CU may implement some or all of the functionality of the radio resource control (RRC) layer, while the DU may implement some or all of the functionality of the radio link control (RLC) layer.

[0041] Illustratively, some base stations 102 configured for IAB can communicate with the DU of an IAB donor node or other parent IAB node (e.g., a base station) via a corresponding CU, and further, can communicate with child IAB nodes (e.g., other base stations) and / or one or more UEs 104 via a corresponding DU. One or more base stations 102 configured for IAB can be an IAB donor connected to at least one of the EPC 160 and / or the core network 190 via a CU. By doing so, the base station 102 operating as an IAB donor can provide a link to one of the EPC 160 or the core network 190 for one or more UEs and / or other IAB nodes (which may be directly connected to the IAB donor or indirectly connected (e.g., separated from the IAB donor by more than one hop)). In the context of communicating with the EPC 160 or the core network 190, both the UE and the IAB node can communicate with the DU of the IAB donor. In some additional aspects, one or more base stations 102 can be configured with connectivity in an open RAN (ORAN) and / or a virtualized RAN (VRAN), which can be achieved through at least one corresponding CU, DU, RU, RRH and / or remote unit.

[0042] Base stations 102 can communicate wirelessly with UEs 104. Each base station 102 can provide communication coverage for a respective geographic coverage area 110. There can be overlapping geographic coverage areas 110. For example, a small cell 102' can have a coverage area 110' that overlaps with the coverage area 110 of one or more macro base stations 102. A network that includes both small cells and macro cells can be referred to as a heterogeneous network. A heterogeneous network can also include a home evolved Node B (eNB) (HeNB), which can provide service to a restricted group known as a closed subscriber group (CSG).

[0043] The communication link 120 between the base station 102 and the UE 104 may include uplink (also known as reverse link) transmissions from the UE 104 to the base station 102 and / or downlink (also known as forward link) transmissions from the base station 102 to the UE 104. The communication link 120 may utilize multiple-input multiple-output (MIMO) antenna technology, including spatial multiplexing, beamforming, and / or transmit diversity. The wireless link and other radio links may be on one or more carriers or component carriers (CCs). The base station 102 / UE 104 may utilize spectrum with a bandwidth of up to Y megahertz (MHz) (e.g., 5, 10, 15, 20, 100, 400 MHz, etc.) for each carrier allocated in a carrier aggregation for transmission in each direction totaling up to Yx MHz (e.g., x CCs). These CCs may or may not be contiguous to one another. The allocation of CCs may be asymmetric with respect to the downlink and uplink (e.g., more or fewer CCs may be allocated to the downlink than to the uplink).

[0044] A CC may include a primary CC and one or more secondary CCs. The primary CC may be referred to as a primary cell (PCell), and each secondary CC may be referred to as a secondary cell (SCell). When a UE is known to both a base station at the access network level and at least one core network entity (e.g., AMF and / or MME) at the core network level, and the UE is configured to receive downlink control information in the access network (e.g., the UE may be in an RRC connected state), the PCell may also be referred to as a "serving cell." In some instances where carrier aggregation is configured for a UE, each of the PCell and one or more SCells may be a serving cell.

[0045] Some UEs 104 may communicate with each other using device-to-device (D2D) communication links 158. The D2D communication links 158 may use downlink / uplink WWAN spectrum. The D2D communication links 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 accomplished through various wireless D2D communication 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.

[0046] The wireless communication system may further include a Wi-Fi access point (AP) 150 in communication with a Wi-Fi station (STA) 152 via a communication link 154, for example, in a 5 gigahertz (GHz) unlicensed spectrum. When communicating in the unlicensed spectrum, the STA 152 / AP 150 may perform a clear channel assessment (CCA) to determine whether the channel is available before communicating.

[0047] Small cell 102′ can operate in licensed and / or unlicensed spectrum. When operating in unlicensed spectrum, small cell 102′ can adopt NR and use the same unlicensed spectrum (e.g., 5 GHz, etc.) used by Wi-Fi AP 150. Small cell 102′ adopting NR in unlicensed spectrum can improve access network coverage and / or increase access network capacity.

[0048] The electromagnetic spectrum is typically subdivided into various classes, bands, channels, etc. based on frequency / wavelength. 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). Frequencies between FR1 and FR2 are typically referred to as mid-band frequencies. Although a portion of FR1 is greater than 6 GHz, FR1 is often (interchangeably) referred to as the “sub-6 GHz” band in various documents and articles. Similar naming issues sometimes arise with respect to FR2, which is often (interchangeably) referred to as “millimeter wave” (or “mmWave” or simply “mmW”) in various documents and articles, although it is different from the extremely high frequency (EHF) band (30 GHz–300 GHz) identified as the “millimeter wave” (mmW) band by the International Telecommunication Union (ITU).

[0049] Taking the above into account, unless otherwise specified, as used herein, the terms "sub-6 GHz," "sub-7 GHz," and the like may broadly refer to frequencies that may be less than 6 GHz, less than 7 GHz, within FR1, or may include mid-band frequencies. Furthermore, unless otherwise specified, as used herein, the terms "millimeter wave" and other similar references may broadly refer to frequencies that may include mid-band frequencies, within FR2, or within the EHF band.

[0050] Whether a small cell 102' or a large cell (e.g., a macro base station), base station 102 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 the traditional sub-6 GHz spectrum, in millimeter wave frequencies, and / or near millimeter wave frequencies to communicate with UE 104. When gNB 180 operates in millimeter wave frequencies or near millimeter wave frequencies, gNB 180 may be referred to as a millimeter wave base station. Millimeter wave base station 180 may utilize beamforming 182 with UE 104 to compensate for path loss and short range. Base station 180 and UE 104 may each include multiple antennas, such as antenna elements, antenna panels, and / or antenna arrays, to facilitate beamforming.

[0051] Base station 180 may transmit beamformed signals in one or more transmit directions 182′ to UE 104. UE 104 may receive beamformed signals from base station 180 in one or more receive directions 182″. UE 104 may also transmit beamformed signals to base station 180 in one or more transmit directions. Base station 180 may receive beamformed signals from UE 104 in one or more receive directions. Base station 180 / UE 104 may perform beam training to determine the best receive direction and transmit direction for each of base station 180 / UE 104. The transmit direction and receive direction of base station 180 may be the same or different. The transmit direction and receive direction of UE 104 may be the same or different.

[0052] EPC 160 may include a Mobility Management Entity (MME) 162, other MMEs 164, a Serving Gateway 166, an MBMS Gateway 168, a Broadcast Multicast Service Center (BM-SC) 170, and a Packet Data Network (PDN) Gateway 172. MME 162 may be in communication with a Home Subscriber Server (HSS) 174. MME 162 is a control node that handles signals between UE 104 and EPC 160. Generally speaking, MME 162 provides bearer and connection management. All user Internet Protocol (IP) packets are passed through Serving Gateway 166, which is connected to PDN Gateway 172. PDN Gateway 172 provides UE IP address allocation and other functions. PDN Gateway 172 and BM-SC 170 are connected to IP Services 176. IP Services 176 may include the Internet, an intranet, an IP Multimedia Subsystem (IMS), Packet Switched (PS) streaming services, and / or other IP services. The BM-SC 170 can provide functionality for MBMS user service provisioning and delivery. The BM-SC 170 can serve as the entry point for content providers' MBMS transmissions, authorize and initiate MBMS bearer services within the Public Land Mobile Network (PLMN), and schedule MBMS transmissions. The MBMS Gateway 168 can be used to distribute MBMS traffic to base stations 102 within the Multicast Broadcast Single Frequency Network (MBSFN) area broadcasting a specific service, and can be responsible for session management (start / stop) and collecting eMBMS-related charging information.

[0053] 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 a control node that processes signals between the UE 104 and the core network 190. Generally speaking, the AMF 192 provides quality of service (QoS) flows and session management. All user IP packets are passed through the UPF 195. The UPF 195 provides UE IP address allocation and other functions. The UPF 195 is connected to the IP services 197. The IP services 197 may include the Internet, an intranet, IMS, PS streaming services, and / or other IP services.

[0054] A base station may include and / or be referred to as a gNB, a Node B, an 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. Base station 102 provides an access point for UE 104 to EPC 160 or core network 190. Examples of UE 104 include a cellular phone, a smartphone, 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., an MP3 player), a camera, a game console, a tablet device, 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 similarly functional device. Some UEs 104 may be referred to as IoT devices (e.g., a parking meter, a gas pump, an oven, a vehicle, a heart monitor, etc.). 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 communication 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.

[0055] Refer again Figure 1 In certain aspects, the wireless communication system and access network 100 may include, among other things, a base station 102 / 180, a first UE 104 communicating on a cellular communication link within a coverage area 110, a second UE 106 communicating on a side link or direct communication link within the coverage area 110, and a third UE 108 communicating on a side link or direct communication link outside the coverage area 110.

[0056] According to the system and access network 100, the cellular communication link may be over a Uu interface, while the side link or direct communication link may be over a PC5 interface. When the communication link and the associated interface may share a set of resources (which may cause interference), at least one of the base station 102 / 180, the first UE 104, the second UE 106, and / or the third UE 108 may be configured for spatial interference management (e.g., mitigation or avoidance) (198) on an interfering channel between the first communication link of the PC5 interface and the second communication link of the Uu interface.

[0057] In some aspects, at least one of the first UE 104, the second UE 106, or the base station 102 / 180 may be configured to determine at least one resource of an interfering channel that interferes with the first communication link of the first interface. The interfering channel may be associated with the second communication link of the second interface. At least one of the first UE 104, the second UE 106, or the base station 102 / 180 may generate at least one first reference signal (RS) for channel estimation of the interfering channel. At least one of the first UE 104, the second UE 106, or the base station 102 / 180 may then transmit at least one first reference signal on the at least one resource of the interfering channel. Further, at least one of the first UE 104, the second UE 106, or the base station 102 / 180 may communicate on the first communication link of the first interface. In such aspects, at least one generated reference signal and its transmission on the determined at least one resource may be used for spatial interference management (e.g., mitigation or avoidance) (198) on the interfering channel between the first communication link of the PC5 interface and the second communication link of the Uu interface.

[0058] In some other aspects, at least one of the first UE 104 or the second UE 106 can be configured to detect an interfering channel from a first communication link of the first interface to a second communication link of the second interface. At least one of the first UE 104 or the second UE 106 can then communicate on the first communication link of the first interface based on detecting the interfering channel. In such other aspects, the detection of the interfering channel can be used for spatial interference management (e.g., mitigation or avoidance) (198) on the interfering channel between the first communication link of the PC5 interface and the second communication link of the Uu interface.

[0059] In yet a further aspect, the base station 102 / 180 can be configured to determine at least one resource of an interfering channel that interferes with the first communication link of the first interface. The interfering channel can be associated with the second communication link of the second interface. The base station 102 / 180 can then transmit first configuration information indicating at least one resource to at least one of the first UE 104 or the second UE 106. The configuration information can enable transmission of at least one first reference signal on at least one resource of the interfering channel. Additionally, the base station 102 / 180 can communicate with the first UE 104 on the first communication link of the first interface. In such a further aspect, the transmission of the determined at least one resource of the interfering channel and the configuration information indicating the same resource can be used for spatial interference management (e.g., mitigation or avoidance) (198) on the interfering channel between the first communication link of the PC5 interface and the second communication link of the Uu interface.

[0060] While the present disclosure may focus on 5G NR, the concepts and aspects described herein may be applicable to other similar areas such as LTE, LTE-Advanced (LTE-A), Code Division Multiple Access (CDMA), Global System for Mobile Communications (GSM), or other wireless / radio access technologies.

[0061] Figure 2A is a diagram 200 illustrating an example of a first subframe within a 5G NR frame structure. Figure 2B is a diagram 230 illustrating an example of downlink channels within a 5G NR subframe. Figure 2C is a diagram 250 illustrating an example of a second subframe within a 5G NR frame structure. Figure 2D FIG280 is a diagram illustrating an example of an uplink channel within a 5G NR subframe. The 5G NR frame structure can be frequency division duplex (FDD), where for a particular set of subcarriers (carrier system bandwidth), subframes within that subcarrier set are dedicated to either downlink or uplink; or time division duplex (TDD), where for a particular set of subcarriers (carrier system bandwidth), subframes within that subcarrier set are dedicated to both downlink and uplink. Figure 2A 、 2C In the example provided, the 5G NR frame structure is assumed to be TDD, where subframe 4 is configured with slot format 28 (mostly downlink) and subframe 3 is configured with slot format 34 (mostly uplink), where D is downlink, U is uplink, and F is for flexible use between downlink / uplink. Although subframes 3 and 4 are shown as having slot formats 34 and 28, respectively, any particular subframe can be configured with any of the various available slot formats 0-61. Slot formats 0 and 1 are full downlink and full uplink, respectively. Other slot formats 2-61 include a mix of downlink, uplink, and flexible codewords. The UE is configured with the slot format (dynamically configured through downlink control information (DCI) or semi-statically / statically configured through RRC signaling) through the received slot format indicator (SFI). Note that the following description also applies to the 5G NR frame structure for TDD.

[0062] Other wireless communication technologies may have different frame structures and / or different channels. A frame (e.g., a 10 millisecond (ms) frame) may be divided into 10 equally sized subframes (1 ms). Each subframe may include one or more time slots. A subframe may also include mini-slots, which may include 7, 4, or 2 symbols. Each time slot may include 7 or 14 symbols, depending on the time slot configuration. For time slot configuration 0, each time slot may include 14 symbols, while for time slot configuration 1, each time slot may include 7 symbols. The symbols on the downlink may be cyclic prefix (CP) orthogonal frequency division multiplexing (OFDM) (CP-OFDM) symbols. The symbols on the uplink may be CP-OFDM symbols (for high throughput scenarios) or discrete Fourier transform (DFT) spread OFDM (DFT-s-OFDM) symbols (also known as single carrier frequency division multiple access (SC-FDMA) symbols) (for power-limited scenarios; limited to single-stream transmission). The number of time slots within a subframe is based on the time slot configuration and parameter design. For slot configuration 0, different parameter designs μ of 0 to 4 allow 1, 2, 4, 8, and 16 slots per subframe, respectively. For slot configuration 1, different parameter designs 0 to 2 allow 2, 4, and 8 slots per subframe, respectively. Accordingly, for slot configuration 0 and parameter design μ, there are 14 symbols per slot and 2 per subframe. μ The subcarrier spacing and symbol length / duration vary depending on the parameter design. The subcarrier spacing can be equal to 2 μ *15 kilohertz (kHz), where μ is parameter design 0 through 4. Thus, parameter design μ=0 has a subcarrier spacing of 15 kHz, while parameter design μ=4 has a subcarrier spacing of 240 kHz. The symbol length / duration is inversely related to the subcarrier spacing. Figures 2A to 2D An example is provided for slot configuration 0 with 14 symbols per slot and parameter design 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 microseconds (μs). Within a frame set, there may be one or more different bandwidth parts (BWPs) that are frequency division multiplexed (see Figure 2B ). Each BWP may have a specific parameter design.

[0063] A resource grid can be used to represent the frame structure. Each slot includes a resource block (RB) (also called a physical RB (PRB)) that extends over 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.

[0064] like Figure 2A As illustrated in FIG, some REs carry at least one pilot and / or reference signal (RS) for the UE. In some configurations, the RS may include at least one demodulation RS (DM-RS) (denoted as R for a particular configuration) for channel estimation at the UE.x , where 100x is the port number, but other DM-RS configurations are possible) and / or at least one channel state information (CSI) RS (CSI-RS). In some other configurations, the RS may additionally or alternatively include at least one beam measurement (or management) RS (BRS), at least one beam refinement RS (BRRS) and / or at least one phase tracking RS (PT-RS).

[0065] Figure 2B Examples of various downlink channels within a subframe of a frame are illustrated. The physical downlink control channel (PDCCH) carries DCI within one or more control channel elements (CCEs), each CCE consisting of nine RE groups (REGs), each REG consisting of four consecutive REs in an OFDM symbol. The PDCCH within a BWP may be referred to as a control resource set (CORESET). Additional BWPs may be located at higher and / or lower frequencies across the channel bandwidth. The primary synchronization signal (PSS) may be within symbol 2 of a particular subframe of a frame. The PSS is used by the UE 104 to determine subframe / symbol timing and the physical layer identity. The secondary synchronization signal (SSS) may be within symbol 4 of a particular subframe of a frame. The SSS is used by the UE to determine the 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 may determine the physical cell identifier (PCI). Based on the PCI, the UE may determine the location of the aforementioned DM-RS. The physical broadcast channel (PBCH), which carries the master information block (MIB), can be logically grouped with the PSS and SSS to form a synchronization signal (SS) / PBCH block (also known as an SS block (SSB)). The MIB provides the number of RBs in the system bandwidth and the system frame number (SFN). The physical downlink shared channel (PDSCH) carries user data, broadcast system information not transmitted via the PBCH (such as the system information block (SIB)), and paging messages.

[0066] As in Figure 2CAs illustrated in FIG, some REs carry DM-RSs for channel estimation at the base station (indicated as R for one specific configuration, but other DM-RS configurations are possible). The UE may transmit DM-RSs for the physical uplink control channel (PUCCH) and DM-RSs for the physical uplink shared channel (PUSCH). The PUSCH DM-RS may be transmitted in the first or first two symbols of the PUSCH. The PUCCH DM-RS may be transmitted in different configurations depending on whether a short PUCCH or a long PUCCH is transmitted and on the specific PUCCH format used. The UE may transmit a sounding reference signal (SRS). The SRS may be transmitted in the last symbol of the subframe. The SRS may have a comb structure, and the UE may transmit the SRS on one of the comb teeth. The SRS may be used by the base station for channel quality estimation to enable frequency-dependent scheduling on the uplink.

[0067] Figure 2D Illustrated are examples of various uplink channels within a subframe of a frame. The PUCCH may be located at the position indicated in one configuration. The PUCCH carries uplink control information (UCI), which may include a scheduling request (SR), a channel quality indicator (CQI), a precoding matrix indicator (PMI), a rank indicator (RI), and hybrid automatic repeat request (HARQ) acknowledgement (ACK) / negative acknowledgement (NACK) feedback. The PUSCH carries data and may additionally be used to carry a buffer status report (BSR), a power headroom report (PHR), and / or UCI.

[0068] Figure 33 is a block diagram of a base station 310 and a UE 350 in communication in an access network. In the downlink, IP packets from the EPC 160 may be provided to the controller / processor 375. The controller / processor 375 implements Layer 2 (L2) and Layer 3 (L3) functionality. The L3 layer includes the RRC layer, and the L2 layer includes the Service Data Adaptation Protocol (SDAP) layer, the Packet Data Convergence Protocol (PDCP) layer, the RLC layer, and the Medium Access Control (MAC) layer. The controller / processor 375 provides RRC layer functionality associated with broadcasting of system information (e.g., MIB, SIB), 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 delivery of upper layer packet data units (PDUs), error correction through ARQ, concatenation, segmentation and reassembly of RLC service data units (SDUs), resegmentation 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.

[0069] The transmit (TX) processor 316 and the receive (RX) processor 370 implement Layer 1 (L1) functionality associated with various signal processing functions. L1, which includes the physical (PHY) layer, may include error detection on the transport channel, forward error correction (FEC) encoding / decoding of the transport channel, interleaving, rate matching, mapping onto the physical channel, modulation / demodulation of the physical channel, and MIMO antenna processing. The TX processor 316 handles the mapping to the signal constellation 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., a 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 generate multiple spatial streams. Channel estimates from a channel estimator 374 may be used to determine the coding and modulation schemes and for spatial processing. The channel estimates 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 318TX. Each transmitter 318TX may modulate a radio frequency (RF) carrier with a corresponding spatial stream for transmission.

[0070] At the UE 350, each receiver 354RX receives a signal via at least one corresponding antenna 352. Each receiver 354RX recovers information modulated onto an RF carrier and provides the information to a receive (RX) processor 356. The TX processor 368 and the RX processor 356 implement L1 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 there are multiple spatial streams 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 includes a separate OFDM symbol stream for each subcarrier of the OFDM signal. The symbols on each subcarrier, as well as the reference signal, are recovered and demodulated by determining the signal constellation point most likely transmitted by the base station 310. These soft decisions may be based on channel estimates calculated by the channel estimator 358. These soft decisions are then decoded and deinterleaved to recover the data and control signals originally transmitted on the physical channel by the base station 310. These data and control signals are then provided to the controller / processor 359, which implements L3 and L2 functionality.

[0071] The controller / processor 359 may 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 uplink, the controller / processor 359 provides demultiplexing between transport and logical channels, packet reassembly, cipher decoding, 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.

[0072] Similar to the functionality described in conjunction with downlink transmissions performed by the base station 310, the controller / processor 359 provides RRC layer functionality associated with system information (e.g., MIB, SIB) acquisition, RRC connection, and measurement reporting; PDCP layer functionality associated with header compression / decompression and security (ciphering, deciphering, integrity protection, integrity verification); RLC layer functionality associated with delivery of upper layer PDUs, error correction through ARQ, concatenation, segmentation, and reassembly of RLC SDUs, resegmentation of RLC data PDUs, and reordering of RLC data PDUs; and MAC layer functionality associated with mapping between logical channels and transport channels, multiplexing MAC SDUs onto TBs, demultiplexing MAC SDUs from TBs, scheduling information reporting, error correction through HARQ, priority handling, and logical channel prioritization.

[0073] Channel estimates derived by a channel estimator 358 from a reference signal or feedback transmitted by the base station 310 may be used by a TX processor 368 to select the appropriate coding and modulation scheme, and to facilitate spatial processing. The spatial streams generated by the TX processor 368 may be provided to different antennas 352 via separate transmitters 354TX. Each transmitter 354TX may modulate an RF carrier with a corresponding spatial stream for transmission.

[0074] Uplink transmissions are processed at the base station 310 in a manner similar to that described with respect to the receiver functionality at the UE 350. Each receiver 318RX receives a signal through at least one corresponding antenna 320. Each receiver 318RX recovers information modulated onto an RF carrier and provides the information to an RX processor 370.

[0075] The controller / processor 375 may 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 uplink, the controller / processor 375 provides demultiplexing between transport and logical channels, packet reassembly, cipher decoding, header decompression, and control signal processing to recover IP packets from the UE 350. The 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 ACK and / or NACK protocols to support HARQ operations.

[0076] In some aspects, at least one of the TX processor 368, the RX processor 356, and the controller / processor 359 may be configured to perform operations related to Figure 1 The 198 combines all aspects.

[0077] In some other aspects, at least one of the TX processor 316, the RX processor 370, and the controller / processor 375 may be configured to perform a combined Figure 1 Aspects of managing (eg, mitigating or avoiding) (198) spatial interference on an interfering channel between a first communication link of a PC5 interface and a second communication link of a Uu interface.

[0078] In some wireless networks, various wireless communication devices may be configured for different types of communications, even within the same network. For example, an example RAN may include devices configured to communicate using different technologies, such as conventional uplink / downlink communications that may provide connectivity to a core network, and D2D technologies, in which devices may communicate directly with each other, e.g., such that the communication path between the devices avoids the core network and generally does not rely on a base station (although a base station may configure or coordinate some aspects of the D2D communications).

[0079] Wireless communication may occur over a specific interface, which may implement one or more layers of a protocol stack. That is, devices may communicate according to a specific technology over an interface corresponding to the specific technology, where the interface provides a mechanism for implementing the layers of the protocol stack. Illustratively, a protocol stack for communicating in a RAN (e.g., a 5G NR RAN) may include L1, L2, and L3 layers (e.g., see above). Figure 3 description).

[0080] In 5G NR and some other RATs, the communication link between a base station and (user) in the RAN may be over the air interface. The air interface may be implemented over the Uu interface in the context of linking the UE to the RAN, such as a base station (e.g., eNB, gNB, etc.) or other network infrastructure. The Uu interface may include an L3 layer with an RRC layer, where resources and / or signaling radio bearers are allocated via RRC connection establishment. Channels on the Uu interface include uplink from the UE to the base station and downlink from the base station to the UE.

[0081] Two UEs in the RAN can also be configured with a direct communication link, which can be over a one-to-many interface and / or a sidelink interface. Such a direct device communication link can be implemented via a PC5 interface, which can include a sidelink channel (instead of uplink / downlink). The PC5 interface can be implemented over an air interface, although with some differences from the Uu interface (e.g., PC5 can be simplified relative to Uu). Specifically, the direct device communication link can be connectionless, and therefore, one or more layers of L2 and / or L3 (e.g., the RRC layer) can be excluded from the protocol stack.

[0082] Even on different interfaces, different communication links may share some or all of the RAN's radio resources, which may include overlapping and / or adjacent resources (e.g., resources onto which signaling is not specifically mapped but onto which signal energy may leak). Thus, resources may be shared between systems and devices on the same or different types of communication links, potentially within the same cell or other geographically adjacent areas. In one example, resources may be shared between UEs configured separately via PC5 interfaces on two direct communication links. In another example, resources may be shared between a UE configured via a PC5 interface on a direct communication link and a base station and another UE configured via a Uu interface on an access network communication link or a network infrastructure communication link.

[0083] The use of shared resources between communication links can lead to interference because signaling on different links may overlap or leak into each other, thereby reducing the signal-to-noise ratio (SNR) and the probability of a receiver successfully decoding the signal. Resources shared between a first transmitter-receiver link and a second transmitter-receiver link can result in an interfering channel. In the context of a RAN, sidelink channels on the PC5 interface that share resources with uplink and / or downlink channels on the Uu interface can define an interfering channel with respect to an access network communication link on the Uu interface and / or a direct device communication link on the PC5 interface. Potentially, the interference on the interfering channel caused by sidelink communication on the PC5 interface can be unconstrained (e.g., for U symbols), which can significantly degrade the link quality of the access network communication link on the Uu interface (and / or another direct device communication link on the PC5 interface). Accordingly, there is a need to improve resource sharing between independent transmitter-receiver pairs with adjacent communication links.

[0084] This disclosure describes techniques and solutions for managing (e.g., mitigating or avoiding) interference when resources are shared between independent transmitter-receiver pairs with adjacent communication links, whether those communication links are on the same interface (e.g., PC5) or on different interfaces (e.g., PC5 and Uu). For example, this disclosure details MIMO techniques for interference management (e.g., mitigation, avoidance, blanking, etc.) when the same resources are used for independent communication links on the same and / or different interfaces. Many of the techniques and solutions described herein can be implemented individually or in combination to manage interfering channels caused by resources being used in common on the same and / or different interfaces.

[0085] Figure 4 Illustrated are diagrams of example wireless communication environments 400, 420, 440 that include a base station 402 and multiple UEs 404, 406, 408. In each of the example environments 400, 420, 440, at least one of the base station 402 and / or the UEs 404, 406, 408 may be configured to implement various MIMO techniques for interference nulling when the same resources are used for Uu and / or PC5 communication links.

[0086] In various example environments, the base station 402 can communicate with the first UE 404 over a Uu interface, with the radio link therebetween being referred to as a Uu link 412. Thus, the first UE 404 can be referred to as a Uu UE, and further can be referred to as an RX Uu UE when receiving downlink communications from the base station 402 over the Uu interface and / or a TX Uu UE when transmitting uplink communications to the base station 402 over the Uu interface.

[0087] The second and third UEs 406, 408 can be configured to communicate directly with each other over the PC5 interface. Therefore, both the second and third UEs 406, 408 can be referred to as PC5 UEs, where the transmitting side is referred to as a TX PC5 UE and the receiving side is referred to as an RX PC5 UE. The PC5 UEs 406, 408 can communicate over a side link or a direct communication link (which can be referred to as a PC5 link 414) of the PC5 interface.

[0088] A potential scenario of UE-to-UE interference is illustrated with reference to a first example environment 400. Specifically, a first PC5 UE 406 may transmit to a second PC5 UE 408 on a PC5 link 414, and in doing so may cause interference to a Uu UE 404 configured to receive downlink communications from a base station 402 on a Uu link 412. Potentially, while causing interference to the Uu UE 404, the first PC5 UE 406 may refrain from or be prohibited from transmitting on the PC5 link 414. However, the potential for interference may not be known in advance, or it may be desirable to avoid interference management by backing off to some extent by each transmitter-receiver pair.

[0089] The interference caused by the first PC5 UE 406 may be on resources shared between the PC5 link 414 and the Uu link 412. Such shared resources may be represented (and modeled) as an interference channel 416 between the PC5 link 414 and the Uu link 412. The interference channel 416 may be modeled for estimating and compensating for the interference experienced on the shared and / or adjacent resources of the Uu link 412 and the PC5 link 414.

[0090] In some aspects, the interfering channel 416 can be managed so that the first PC5 UE 406 can be allowed to transmit in the null space of the interfering channel 416 (if any), which can correspond to a spatial direction that limits interference to the Uu UE 404 on the Uu link 412. In practice, the null space of the interfering channel 416 (or its matrix model) can include spatial regions or compartments in which energy does not exist or form, for example, due to cancellation and / or destructive interference patterns of radio frequency (RF) waves. Potentially, the null space of the interfering channel 416 can include a shared resource on which the first PC5 UE 406 transmits signaling on the PC5 link 414, which signaling is orthogonal to other signaling on the Uu link 412 on the interfering channel 416. Thus, the null space can be functionally equivalent to orthogonality on the interfering channel 416.

[0091] However, the first PC5 UE 406 may first detect the interfering channel 416 in order to determine whether to transmit on the PC5 link 414 or to refrain from (e.g., delay) transmitting on the PC5 link 414. Thus, RSs may be transmitted so that the first PC5 UE 406 can receive those RSs in order to detect the interfering channel 416. However, in order to be able to detect the interfering channel 416, the RS may be transmitted on at least one configured resource on the interfering channel 416, which may be at least one resource on the PC5 link 414 and the Uu link 412.

[0092] In some aspects, the base station 402 may configure at least one resource. For example, the base station 402 may determine at least one resource shared between the PC5 link 414 and the Uu link 412, and also on the interference channel 416. In some other aspects, the base station 402 may further configure at least one RS to be transmitted on the at least one resource. For example, the base station 402 may configure the at least one RS to include a specific sequence that may be known and / or shared with the first PC5 UE 406. The base station 402 may configure the at least one RS to be at least one of an SRS, a DM-RS, a PT-RS, or a CSI-RS.

[0093] The base station 402 may transmit configuration information indicating the at least one resource and / or the at least one RS to the Uu UE 404. Potentially, the base station 402 may also transmit such configuration information to the first PC5 UE 406 to configure the first PC5 UE 406 to receive the at least one RS on the at least one resource. For example, the base station 402 may transmit such configuration information via RRC signaling and / or DCI.

[0094] The Uu UE 404 may transmit the at least one RS on the at least one resource (e.g., based on the received configuration information) to indicate the interfering channel 416—e.g., the at least one RS may be used to perform channel estimation for the interfering channel 416. The first PC5 UE 406 may receive the at least one RS on the at least one resource (e.g., based on the configuration information). Accordingly, the first PC5 UE 406 may detect the interfering channel 416 based on the at least one RS on the at least one resource. For example, the first PC5 UE 406 may perform channel estimation for the interfering channel 416 based on receiving the at least one RS on the at least one resource. The first PC5 UE 406 may calculate one or more beamforming parameters (e.g., amplitude, direction, weight(s), etc.) and / or may determine a precoder based on the at least one RS received from the Uu UE 404.

[0095] According to various aspects, the Uu UE 404 may transmit the at least one RS on a precoded channel or a non-precoded (or unprecoded) channel. According to various other aspects, the Uu UE 404 may transmit the at least one RS on a whitened channel or a non-whitened channel. The base station 402 may configure the Uu UE 404 to transmit the at least one RS on a precoded or non-precoded channel and / or the at least one resource of a whitened or non-whitened channel.

[0096] In some aspects, the base station 402 may use a spatial relationship information parameter (e.g., a spatialRelationInfo parameter) to indicate configuration information for configuring the at least one RS on the at least one resource, the configuration information corresponding to an identifier (ID) of another reference RS (such as an SSB or CSI-RS or a reference SRS transmitted by the base station 402). Accordingly, the Uu UE 404 may use the same or similar spatial domain filter used for receiving the reference SSB or CSI-RS or transmitting the reference SRS to transmit the at least one RS on the at least one resource. In some other aspects, the base station 402 may transmit a DCI to the Uu UE 404 to indicate a transmission configuration indication (TCI) state of a quasi co-location (QCL) type of type-D. Accordingly, the Uu UE 404 may use the same spatial domain filter indicated by the TCI state for receiving (e.g., receiving the reference SSB or CSI-RS) to transmit the at least one RS on the at least one resource.

[0097] In some aspects, the first PC5 UE 406 may detect (and receive) the at least one RS on the at least one resource from the Uu UE 404. The first PC5 UE 406 may detect an interfering channel 416 based on the at least one RS and may configure transmissions based on the interfering channel 416. Modeling the effective channel (e.g., Uu link 412) with the interfering channel 416 may be used for interference management with the purpose of reducing or avoiding interference from another UE (such as the TX PC5 UE 406).

[0098] Illustratively, the interference signal from the first PC5 UE 406 may be modeled as Y, given in Equation 1:

[0099] Y=H gNB-Uu W d S d +H SL-Uu W I S I +Z where R nn =cov(Z)

[0100] Formula 1

[0101] In Equation 1, H is the channel, which in some instances can be represented by a channel model, such as a channel vector, a channel matrix, or other sample-based representation of the channel. Thus, H gNB-Uu The channel between the base station 402 and the Uu UE 404 (eg, the Uu link 412) may be represented, thereby potentially modeling an ideal channel. SL-Uu It can represent the channel (eg, interference channel 416) between the first PC5 UE 406 and the Uu UE 404. Further, W is the precoder, and thus W d is the desired precoder from base station 402 to Uu UE 404, and W I is the precoder of the first PC5 UE 406 associated with the potential interfering signal to the Uu UE 404 on the interference channel 416. Next, S represents a signal (eg, one or more symbols), where S d is the desired signal (e.g., an ideal signal without interference) transmitted by the base station 402. I represents a signal (eg, symbol) transmitted by the first PC5 UE 406, namely, S I may be a signal on the interfering channel 416 that potentially causes interference to the Uu UE 404. Z may model other interference plus noise from other sources; and R nn =cov(Z) is the covariance matrix of Z.

[0102] When the Uu UE 404 subsequently transmits the at least one RS on the at least one resource without using precoding, if there is any null space on the interfering channel 416, the first PC5 UE 406 may be configured to transmit the at least one RS on the at least one resource in H SL-Uu The precoded channel W in the null space of I The first PC5 UE 406 may receive the at least one non-precoded RS on the at least one resource and may estimate the non-precoded interference channel 416 between the first PC5 UE 406 and the Uu UE 404. If the first PC5 UE 406 finds a null space on the interference channel 416, the first PC5 UE 406 may be in the H SL-Uu The precoded channel W in the null space of I The sidelink transmission is transmitted to the second PC5 UE 408 on the PC5 link 414.

[0103] Illustratively, if the first PC5 UE 406 finds W I S I With H SL-UuOrthogonal, the first PC5 UE 406 can transmit a sidelink transmission to the second PC5 UE 408 on the PC5 link 414. In other words, if the first PC5 UE 406 determines that H SL- Uu W I S I =0 or approximately 0, the first PC5 UE 406 may transmit a sidelink transmission on the PC5 link 414 to the second PC5 UE 408. In at least one configuration, however, when the interfering channel 416 is 2×2, the first PC5 UE 406 may be unable to find a null space on the interfering channel 416. When the first PC5 UE 406 is unable to find a null space on the interfering channel 416, the first PC5 UE 406 may refrain from transmitting a sidelink transmission on the PC5 link 414 to the second PC5 UE 408. That is, the PC5 UE 406 may back off or defer transmissions to the Uu link 412.

[0104] When the Uu UE 404 transmits the at least one RS on the at least one resource using whitening, the first PC5 UE 406 may be configured to transmit the at least one RS on the precoded channel W in the null space of the effective channel. I On transmitting signals, the effective channel can be modeled as Here, the first PC5 UE 406 is in the effective channel Thus, when the at least one RS is transmitted by the Uu UE 404 on the whitened channel, the first PC5 UE 406 may be able to find the null space on the whitened channel. The sidelink transmission is transmitted to the second PC5 UE 408 on the PC5 link 414 in the null space of .

[0105] On the other hand, when the Uu UE 404 transmits the at least one RS on the at least one resource using precoding, the null space of the interference channel 416 on which the first PC5 UE 406 may transmit on the PC5 link 414 may be modeled by the effective channel as That is, when the channel precoder W I Configured in When the sidelink transmission is in the null space of , the first PC5 UE 406 can transmit on the PC5 link 414. In other words, the first PC5 UE 406 can determine the channel estimate based on at least one precoded RS received on the precoded effective channel and transmit the channel estimate when the sidelink transmission is between the base station 402 and the Uu UE 404 by W I exist When the effective channel given by the null space is orthogonal to the one given by the first PC5 UE 406, the first PC5 UE 406 can transmit the sidelink transmission to the second PC5 UE 408 on the PC5 link 414. Here, the first PC5 UE 406 has the greatest chance of finding the null space on the effective channel compared to when at least one RS is transmitted without precoding or with whitening. However, this increase in chance comes at the cost of proportionally increased complexity, as precoding is relatively more complex than non-precoding and whitening.

[0106] In some other aspects, the Uu UE 404 may account for spatial interference from the first PC5 UE 406 on the interfering channel 416 when calculating at least one PMI and reporting the at least one PMI to the base station 402. For example, the Uu UE 404 may account for spatial interference on the interfering channel 416 when calculating at least one PMI based on configuration information received from the base station 402. In some aspects, the base station 402 may configure the Uu UE 404 to transmit at least two separate PMIs: at least one first PMI if spatial interference is present on the interfering channel 416 and at least one second PMI if spatial interference is not present on the interfering channel 416.

[0107] To this end, the base station 402 may transmit at least one second RS (e.g., SSB, CSI-RS, DM-RS, another RS), and the Uu UE 404 may receive the at least one second RS. The Uu UE 404 may determine at least one first PMI based on receiving the at least one second RS and based on spatial interference on the interfering channel, and the at least one first PMI may be associated with downlink communication on the Uu link 412 in the presence of spatial interference on the interfering channel 416.

[0108] Furthermore, the base station 402 may transmit at least one third RS (e.g., SSB, CSI-RS, DM-RS, another RS), and the Uu UE 404 may receive the at least one third RS. The Uu UE 404 may determine at least one second PMI based on receiving the at least one third RS without spatial interference on the interfering channel 416. In other words, the at least one second PMI may be associated with downlink communication on the Uu link 412 without spatial interference on the interfering channel 416.

[0109] The Uu UE 404 may then transmit at least one first PMI and / or at least one second PMI to the base station 402. Potentially, the at least one first PMI and / or the at least one second PMI may correspond to the highest mitigation of spatial interference on the interfering channel 416. In some aspects, the Uu UE 404 may transmit the at least one first PMI and / or the at least one second PMI based on configuration information received from the base station 402, which may configure the Uu UE 404 to report the PMI in both cases where spatial interference is present and where it is not present on the interfering channel 416.

[0110] The base station 402 may receive, for example, based on the transmitted configuration information, at least one first PMI and / or at least one second PMI from the RX Uu UE 404 over the Uu link 412. The base station 402 may then configure communications with the RX Uu UE 404 over the Uu link 412 based on the at least one first PMI and / or the at least one second PMI. For example, the base station 402 may apply the at least one first PMI and / or the at least one second PMI to a downlink transmission to the RX Uu UE 404 over the precoded Uu link 412, which may be received by the RX Uu UE 404.

[0111] Because the first PMI may be based on spatial interference on the interfering channel 416 (e.g., spatial interference caused by the TX PC5 UE 406), the base station 402 may use the first PMI for transmissions of downlink transmissions on the Uu link 412 to the RX Uu UE 404 when the TX PC5 UE 406 is also transmitting sidelink transmissions on the PC5 link 414. For example, when the base station 402 detects spatial interference on the interfering channel 416 (e.g., when the spatial interference satisfies a threshold), the base station 402 may configure a precoder for downlink transmissions on the Uu link 412 to the RX Uu UE 404 based on the first PMI.

[0112] In some aspects, the base station 402 may use the first PMI when scheduling overlapping (e.g., simultaneous) sidelink transmissions by the TX PC5 UE 406. That is, when the base station 402 controls scheduling of sidelink transmissions by the TX PC5 UE 406, the base station 402 may use the first PMI (based on spatial interference on the interfering channel 416) to schedule sidelink transmissions by the TX PC5 UE 406 on the same set of resources as downlink transmissions scheduled by the base station 402 for transmission to the RX Uu UE 404, such as when the Uu link 412 and the PC5 link 414 share a set of resources. For example, for Mode 1 resource allocation (e.g., resources on the PC5 link 414 are allocated by the base station 402), the base station 402 may know in advance whether the sidelink transmission on the PC5 link 414 is scheduled concurrently with the transmission on the Uu link 412. When the base station 402 has such advance knowledge (e.g., in accordance with Mode 1), the base station 402 may refrain from detecting interference on the interfering channel 416 (e.g., to determine whether the sidelink transmission on the PC5 link 414 is concurrent with the transmission on the Uu link 412), but may still use the first PMI (based on the spatial interference on the interfering channel 416) for downlink transmissions on the Uu link 412 to the RX Uu UE 404.

[0113] Similarly, when the TX PC5 UE 406 is not transmitting a sidelink transmission on the PC5 link 414 (or when the TX PC5 UE 406 is transmitting a sidelink transmission with a transmit power sufficiently low to not interfere with downlink transmissions from the base station 402 on the Uu link 412), the base station 402 may use the second PMI (which is based on the absence of spatial interference on the interfering channel 416) for transmitting downlink transmissions on the Uu link 414 to the RX Uu UE 404. For example, when the base station 402 detects the absence of spatial interference or sufficiently low spatial interference on the interfering channel 416 (e.g., when the spatial interference fails to meet a threshold), the base station 402 may configure a precoder for downlink transmissions on the Uu link 412 to the RX Uu UE 404 based on the second PMI.

[0114] In some aspects, the base station 402 may use the second PMI when scheduling non-overlapping (e.g., non-concurrent) sidelink transmissions by the TX PC5 UE 406. That is, when the base station 402 controls the scheduling of sidelink transmissions by the TX PC5 UE 406, the base station 402 may use the second PMI (based on the absence of spatial interference on the interfering channel 416) to schedule sidelink transmissions by the TX PC5 UE 406 on a different set of resources than downlink transmissions scheduled for transmission by the base station 402 to the RX Uu UE 404. For example, for Mode 1 resource allocation (e.g., resources on the PC5 link 414 are allocated by the base station 402), the base station 402 may know in advance that the sidelink transmissions on the PC5 link 414 are not scheduled concurrently with transmissions on the Uu link 412. When the base station 402 has such advance knowledge (e.g., in accordance with Mode 1), the base station 402 can refrain from detecting interference on the interfering channel 416 (e.g., to determine whether the sidelink transmission on the PC5 link 414 is not concurrent with the transmission on the Uu link 412), but can still use the second PMI (based on the absence of spatial interference on the interfering channel 416) for downlink transmissions on the Uu link 412 to the RXUu UE 404 because the base station 402 knows in advance that no sidelink transmissions are scheduled concurrently with the downlink transmission using the second PMI.

[0115] Another potential scenario for UE-to-UE interference is illustrated with reference to a second example environment 420. Specifically, a TX Uu UE 404 may transmit to a base station 402 on a Uu link 412 and, in doing so, may cause interference to an RX PC5 UE 408 configured to receive sidelink communications from a TX PC5 UE 406 on a PC5 link 414. Aspects described with reference to the example environments 400 and 420 may also be applied to a TX PC5 UE interfering with a different RX PC5 UE on a different PC5 link.

[0116] In some aspects, the interference caused by the TX Uu UE 404 may be on resources shared between the PC5 link 414 and the Uu link 412. Such shared resources may include an interference channel 416 between the PC5 link 414 and the Uu link 412.

[0117] The TX Uu UE 404 may be allowed to transmit in the null space between the PC5 link 414 and the Uu link 412, if any null space exists. In practice, the null space of the interfering channel 416 may include a spatial region or compartment where energy does not exist or form, for example, due to cancellation and / or destructive interference patterns of RF waves. Potentially, the null space of the interfering channel 416 may include a shared resource on which the TX Uu UE 404 transmits signaling on the Uu link 412, which is orthogonal to other signaling on the PC5 link 414 on the interfering channel 416. Thus, the null space may be functionally equivalent to orthogonality on the interfering channel 416.

[0118] However, the TX Uu UE 404 may first detect the interfering channel 416 in order to determine whether to transmit on the Uu link 412 or to refrain (e.g., delay) transmitting on the Uu link 414. Thus, the RS may be transmitted so that the TX Uu UE 404 can receive it in order to detect the interfering channel 416. However, in order to be able to detect the interfering channel 416, the RS may be transmitted on at least one configured resource on the interfering channel 416, which may be at least one resource on the Uu link 412 and the PC5 link 414.

[0119] In some aspects, the base station 402 may configure at least one resource (e.g., if the RX PC5 UE 408 is within the coverage area 110). In some other aspects, another UE (e.g., the TX PC5 UE 406) may configure at least one resource. For example, the base station 402 or the TX PC5 UE 406 may determine at least one resource to be shared between the Uu link 412 and the PC5 link 414, and also on the interfering channel 416.

[0120] In some aspects, the base station 402 may further configure at least one RS to be transmitted on the at least one resource (e.g., if the RX PC5 UE 408 is within the coverage area 110). In some other aspects, another UE (e.g., the TX PC5 UE 406) may configure the at least one resource. For example, the base station 402 or the TX PC5 UE 406 may configure the at least one RS to include a specific sequence, which may be known and / or shared with the TX Uu UE 404. The base station 402 or the TX PC5 UE 406 may configure the at least one RS to be at least one of an SRS, a DM-RS, a PT-RS, or a CSI-RS.

[0121] The base station 402 or the TX PC5 UE 406 may transmit configuration information indicating the at least one resource and / or the at least one RS to the RX PC5 UE 408. Potentially, the base station 402 may also transmit such configuration information to the TX Uu UE 404 to configure the TX Uu UE 404 to receive the at least one RS on the at least one resource. For example, the base station 402 may transmit such configuration information via RRC signaling and / or DCI, or the TX PC5 UE 406 may transmit such configuration information as sidelink control information (SCI).

[0122] The RX PC5 UE 408 may transmit the at least one RS on the at least one resource (e.g., based on the received configuration information) to indicate an interfering channel—e.g., the at least one RS may be used to perform channel estimation for the interfering channel 416. The TX Uu UE 404 may receive the at least one RS on the at least one resource (e.g., based on the configuration information). Accordingly, the TX Uu UE 404 may detect the interfering channel 416 based on the at least one RS on the at least one resource. For example, the TX Uu UE 404 may perform channel estimation for the interfering channel 416 based on receiving the at least one RS on the at least one resource.

[0123] In some aspects, the RX PC5 UE 408 may transmit the at least one RS using precoding, whitening, or no precoding. The base station 402 or the TX PC5 UE 406 may configure the RX PC5 UE 408 to transmit the at least one RS on the at least one resource using precoding, whitening, or no precoding. For example, the RX PC5 UE 408 may be configured to transmit the at least one RS on the at least one resource as described above with reference to the RX Uu UE 404.

[0124] In some other aspects, spatial interference from the TX Uu UE 404 on the interfering channel 416 can be considered when calculating precoding information (e.g., at the base station 402). For example, the TX Uu UE 404 can incorporate the spatial interference on the interfering channel 416 when transmitting at least one second RS to facilitate calculation of precoding information by the base station 402. In some aspects, the base station 402 can configure the TX Uu UE 404 to transmit at least two separate RSs: the at least one second RS if spatial interference is present on the interfering channel 416 and the at least one third RS if spatial interference is not present on the interfering channel 416.

[0125] Thus, the base station 402 can receive at least one second RS (e.g., an SRS, a CSI-RS, a DM-RS, another RS) from the TX Uu UE 404 in the presence of spatial interference on an interfering channel 416 for the RX PC5 UE 408—e.g., the at least one second RS can be transmitted when spatial interference is present on the interfering channel 416 (e.g., when the first PC5 UE 406 is concurrently transmitting). The base station 402 can determine first precoding matrix information based on receiving the at least one second RS in the presence of spatial interference on the interfering channel 416, and the first precoding matrix information can be associated with uplink communications on the Uu link 412 in the presence of spatial interference on the interfering channel 416. For example, the base station 402 can determine a first PMI based on the spatial interference on the interfering channel 416—i.e., the first PMI can account for overlapping sidelink transmissions from the TX PC5 UE 406 on the PC5 link 414.

[0126] Furthermore, the TX Uu UE 404 may transmit at least one third RS (e.g., SSB, CSI-RS, DM-RS, another RS), and the base station 402 may receive the at least one third RS. The at least one third RS may be transmitted in the absence of spatial interference on the interfering channel 416—for example, the TX Uu UE 404 may transmit the at least one third RS when the TX PC5 UE 406 is not transmitting a sidelink transmission on the PC5 link 414. The base station 402 may determine the second precoding information based on receiving the at least one third RS but in the absence of spatial interference on the interfering channel 416. In other words, the second precoding matrix information may be associated with uplink communications on the Uu link 412 in the absence of spatial interference on the interfering channel 416 caused by the TX PC5 UE 406. For example, base station 402 may determine a second PMI based on the absence (or sufficiently low) of spatial interference on interfering channel 416—i.e., the second PMI may be based on the absence (or sufficiently low) of overlapping sidelink transmissions from TX PC5 UE 406 on PC5 link 414.

[0127] In some aspects, the base station 402 may determine one of the first or second precoding matrix information associated with communications with the TX Uu UE 404. For example, the base station 402 may receive uplink communications on the Uu link 412 based on the first and / or second precoding information.

[0128] In some other aspects, the base station 402 may transmit the first PMI and / or the second PMI to the TX Uu UE 404. The TX Uu UE 404 may receive the first PMI and / or the second PMI for precoding an uplink channel from the base station 402. The TX Uu UE 404 may apply the first PMI or the second PMI when transmitting an uplink transmission to the base station 402 on the Uu link 412 based on spatial interference on the interfering channel 416.

[0129] For example, when spatial interference on the interfering channel 416 satisfies a threshold (e.g., when the TX PC5 UE 406 is concurrently transmitting on the PC5 link 414), the TX Uu UE 404 may apply the first PMI to uplink transmissions on the Uu link 412 to the base station 402. Thus, when spatial interference occurs on the interfering channel 416, the base station 402 may receive uplink transmissions based on the first PMI because the TX Uu UE 404 transmits uplink transmissions on the Uu link 412 along a precoded channel that accounts for the spatial interference from the TX PC5 UE 406.

[0130] Similarly, when the TX PC5 UE 406 does not transmit a sidelink transmission on the PC5 link 414 (or transmits with a sufficiently low transmit power such that no or a negligible amount of spatial interference is received on the interfering channel 416), the TX Uu UE 404 may apply the second PMI to transmit uplink transmissions on the Uu link 412 to the base station 402. Thus, when there is no spatial interference (or negligible spatial interference) on the interfering channel 416, the base station 402 may receive the uplink transmission based on the second PMI because the TX Uu UE 404 transmits the uplink transmission on the Uu link 412 along a precoded channel from the TX PC5 UE 406 that does not have spatial interference.

[0131] A base station to UE interference scenario is illustrated with reference to example environment 440. Here, RX PC5 UE 408 can transmit at least one RS on at least one resource of interfering channel 416, as described above. Potentially, Uu UE 404 can report at least one first PMI and / or at least one second PMI, as described above. Alternatively or additionally, Uu UE 404 can transmit at least one second RS and / or at least one third RS, as described above.

[0132] Figure 5A block diagram illustrates an example wireless communication environment 500 including a base station 502 and multiple UEs 504, 506, and 508. Example environment 500 illustrates a potential scenario for UE-to-base station interference. Specifically, a TX PC5 UE 506 may transmit to an RX PC5 UE 508 on a PC5 link 514 and, in doing so, may cause interference within a coverage area 510 to the base station 502 that is configured to receive uplink communications from the RX Uu UE 504 on a Uu link 512.

[0133] In some aspects, the interference caused by the TX PC5 UE 506 may be on resources shared between the PC5 link 514 and the Uu link 512. Such shared resources may be modeled as an interference channel 516, which includes the shared resources of the PC5 link 514 and the Uu link 512. According to some technologies (e.g., V2X), the interference on the interference channel 516 may be mitigated by configuring the TX PC5 UE 506 with a specific set of open-loop power control parameters, which may be different from other open-loop power control parameters and may be selected based on the interference caused to the base station 502 on the Uu link 512. For example, the power value(s) given below may be minimized: (1) open-loop power control based on downlink path loss; and (2) open-loop power control based on sidelink path loss. By configuring the TX PC5 UE 506 to transmit at the minimum power value(s), the interference on the interference channel 516 may be reduced.

[0134] In another aspect, the base station 502 may configure the TX PC5 UE 506 with a transmission scheme and / or precoder, for example, by transmitting configuration information to the TX PC5 UE 506 via RRC signaling or DCI. In some aspects, the TX PC5 UE 506 may transmit a transmission configuration (e.g., in RRC parameters (such as txconfig)) and / or at least one RS (e.g., at least one SRS) to the base station 502 on at least one resource. The base station 502 may receive the transmission configuration and / or at least one RS, and the base station 502 may determine a transmission scheme and / or precoder for the TX PC5 UE 506 that mitigates interference on the interfering channel 516 to reception of uplink transmissions of the base station 502 on the Uu link 512. The base station 502 may determine the transmission scheme and / or precoder for one or both of a codebook-based and / or non-codebook-based transmission configuration. The base station 502 may then transmit the transmission scheme and / or precoder information (eg, PMI) to the TX PC5 UE 506 to enable the TX PC5 UE 506 to transmit on the PC5 link 514 with reduced interference on the interfering channel 516 .

[0135] Figure 6 6 is a flow chart of a method 600 for wireless communication by a wireless communication device. The method 600 may be implemented at a UE (e.g., UEs 104, 106, 108, 350, 404, 406, 408, 504, 506, 508), at a base station (e.g., base stations 102 / 180, 310, 402, 502), and / or at another device (e.g., device 902, 1002). According to different aspects, one or more of the illustrated operations may be swapped, omitted, and / or performed concurrently.

[0136] At 602, the device may receive configuration information. For example, the configuration information may be received from a base station or another UE. The configuration information may be received via at least one of DCI, RRC signaling and / or SCI. The configuration information may indicate a spatial transmit filter with which the RS is transmitted. In some aspects, the configuration information may indicate a configuration for at least one RS and / or at least one resource on which the at least one RS is to be transmitted. In some other aspects, the configuration information may indicate a configuration for reporting at least one first PMI in the presence of spatial interference on an interfering channel and / or reporting at least one second PMI in the absence of spatial interference on an interfering channel. In a further aspect, the configuration information may indicate a configuration for transmitting at least one second RS for determining precoding matrix information in the presence of spatial interference on an interfering channel and / or transmitting at least one third RS in the absence of spatial interference on an interfering channel. Reference Figure 4 , for example, at least one of the Uu UE 404 and / or the TX PC5 UE 406 may receive configuration information associated with transmitting or receiving signaling on the interfering channel 416 .

[0137] In some aspects, the configuration information may include a transmission configuration including at least one of a transmission scheme and / or a precoder. In some aspects, the transmission configuration may be applied to codebook-based transmissions, while in other aspects, the configured transmissions may be applied to non-codebook-based transmissions. In still other aspects, the transmission configuration may be received on an interface (e.g., Uu) that is different from the interface (e.g., PC5) on which the transmission configuration is to be applied. For example, the transmission configuration may be received from a base station and the device may be configured to reduce interference caused to the base station. Figure 5 For example, the PC5 UE 506 may receive a transmission configuration from the base station 502 to be applied to the PC5 link 514 .

[0138] At 604, the device may determine at least one resource of an interfering channel that interferes with a first communication link of the first interface and is associated with a second communication link of the second interface. In some aspects, the device may decode the received configuration information, and the device may identify an indication of the at least one resource of the interfering channel from the decoded received configuration information. In some other aspects, the device may measure energy on resources allocated to a link on which the device communicates with another device, or may measure an SNR on these resources. The device may compare the measured energy and / or SNR to corresponding thresholds, and the device may determine whether the at least one resource is on the interfering channel based on the comparison. Figure 4 For example, at least one of the base station 402, the Uu UE 404, and / or the first PC5 UE 406 may determine at least one resource of the interfering channel 416 that interferes with one of the PC5 link 414 or the Uu link 412. Figure 5 For example, the PC5 UE 506 may determine at least one resource of the interfering channel 516 that interferes with the PC5 link 514 .

[0139] At 606, the device may generate at least one first RS for channel estimation of the interfering channel. According to various aspects, the at least one first RS may include one of an SRS, a CSI-RS, a DM-RS, or a PT-RS. In some aspects, the at least one first RS may include a sequence selected based on that the at least one first RS is intended for channel estimation. For example, first, the device may select a sequence for the at least one first RS and may generate a digital signal, and then, the device may convert the digital signal into analog for transmission. Figure 4 For example, at least one of the base station 402, the Uu UE 404, and / or the first PC5 UE 406 may generate at least one first RS for channel estimation of the interference channel 416. Figure 5 For example, the PC5 UE 506 may generate at least one first RS for channel estimation of the interfering channel 516 .

[0140] At 608, the device may transmit at least one first RS on the at least one resource of the interfering channel. That is, the device may transmit at least one first RS on the first communication link, and the first communication link may share the at least one resource with the second communication link (or the at least one resource may be adjacent to the resources of the second communication link and may therefore leak into the resources of the second communication link). Figure 4 For example, at least one of the base station 402, the Uu UE 404, and / or the first PC5 UE 406 may transmit at least one first RS on at least one resource of the interference channel 416. Figure 5 , for example, the PC5 UE 506 may transmit at least one first RS on at least one resource on the interference channel 516 .

[0141] At 610, the device may communicate on a first communication link of a first interface. For example, the device may transmit signaling on the first communication link of the first interface and / or the device may receive signaling on the first communication link of the first interface. When the device is a base station or communicates with a base station on an uplink / downlink, the first interface may include a Uu interface. When the device is a UE communicating with another UE on a side link, the first interface may include a PC5 interface. Figure 4 For example, the base station 402 and the Uu UE 404 may communicate over a Uu link 412 of a Uu interface, and / or the first PC5 UE 406 may communicate with the second PC5 UE 408 over a PC5 link 414 of a PC5 interface. Figure 5 , for example, PC5 UE 506 may communicate with a second PC5 UE 508 over a PC5 link 514 of a PC5 interface.

[0142] At 612, the device may receive at least one second RS and / or at least one third RS from another device (e.g., a base station). In some aspects, the at least one second RS and / or at least one third RS may include one or more of an SSB, a CSI-RS, a DM-RS, and / or a PT-RS. In some other aspects, the at least one second RS and / or at least one third RS may include at least one SRS. Figure 4 For example, the Uu UE 404 or the PC5 UE 406 may receive at least one second RS and / or at least one third RS from the base station 402. In another example, the base station 402 may receive at least one second RS and / or at least one third RS from one of the Uu UE 404 or the PC5 UE 406.

[0143] At 614, the device may determine at least one first PMI based on the at least one second RS and / or determine at least one second PMI based on the at least one third RS. For example, first, the device may perform channel estimation for the first communication link (e.g., using the at least one second RS and / or the at least one third RS), and second, the device may calculate or compute a desired precoder based on the channel estimation. In some aspects, the at least one first PMI may be determined (e.g., using the at least one second RS) in the presence of spatial interference on the interfering channel, and the at least one second PMI may be determined (e.g., using the at least one third RS) in the absence of spatial interference on the interfering channel. Reference Figure 4For example, the Uu UE 404 may determine at least one first PMI for the Uu link 412 based on at least one second RS received from the base station 402 and / or determine at least one second PMI based on at least one third RS received from the base station 402 .

[0144] At 616, the device may transmit at least one first PMI and / or at least one second PMI to the other device (eg, a base station). Figure 4 For example, the Uu UE 404 may transmit at least one first PMI to the base station 402 over the Uu link 412 and / or may transmit at least one second PMI to the base station 402 over the Uu link 412 .

[0145] At 618, the device may transmit at least one fourth signal to the other device (e.g., a base station) based on the presence of spatial interference on the interfering channel and / or transmit at least one fifth signal to the other device in the absence of spatial interference on the interfering channel. For example, the at least one fourth signal and / or the at least one fifth signal may include another RS. In some aspects, the at least one fourth signal and / or the at least one fifth signal may implement a precoder calculation performed by the other device (e.g., a base station on a Uu link or other PC5 UE on a PC5 link). In some other aspects, the at least one fourth signal and / or the at least one fifth signal may be based on a channel estimate or a precoded signal received from the other device. Reference Figure 4 For example, the Uu UE 404 or the PC5 UE 406 may transmit at least one fourth RS to the base station 402 based on the presence of spatial interference on the interference channel 416 and / or transmit at least one fifth RS to the base station 402 when the spatial interference on the interference channel 416 is canceled or cleared. In another example, the base station 402 may transmit at least one fourth RS to one of the Uu UE 404 or the PC5 UE 406 based on the presence of spatial interference on the interference channel 416 and / or transmit at least one fifth RS to one of the Uu UE 404 or the PC5 UE 406 when the spatial interference on the interference channel 416 is canceled or cleared.

[0146] Figure 7 7 is a flow chart of a method 700 for wireless communication by a wireless communication device. The method 700 can be implemented at a UE (e.g., UEs 104, 106, 108, 350, 404, 406, 408, 504, 506, 508), at a base station (e.g., base stations 102 / 180, 310, 402, 502), and / or at another device (e.g., device 902, 1002). According to different aspects, one or more of the illustrated operations may be swapped, omitted, and / or performed concurrently.

[0147] At 702, the device may receive at least one first RS on at least one resource of a first communication link. In some aspects, the at least one first RS may be a CSI-RS, a PT-RS, or a DM-RS. In some other aspects, the at least one first RS may be an SRS. Potentially, the at least one first RS may include a known sequence. In some aspects, the at least one first RS may be received on an interface that is different from the interface on which the device is communicating. For example, the at least one first RS may indicate the presence of another communication link that shares at least some resources with the communication link on which the device is communicating - for example, the at least one first RS may be received on an interfering channel. Figure 4 For example, the Uu UE 404 or the PC5 UE 406 may receive at least one first RS on at least one resource of the Uu link 412 or the PC5 link 414, respectively.

[0148] At 704, the device may detect an interfering channel based on at least one first RS. The interfering channel may be on resources of a first communication link of a first interface that are shared and / or adjacent to a second communication link of a second interface. For example, the device may detect a sequence included in at least one first RS, and the device may compare the detected sequence with at least one known sequence to determine whether the two match. In another example, the device may measure an SNR on the resources of the first communication link, and the device may perform a SNR on noise with a threshold. When the SNR is less than the threshold, the device may detect an interfering channel. Figure 4 , for example, the Uu UE 404 or the PC5 UE 406 may detect the interfering channel 416 based on at least one RS.

[0149] At 706, the device may perform channel estimation on the interference channel based on receiving the at least one first RS. For example, the device may measure at least one value, such as L1-SNR and / or L1-reference signal received power (RSRP), another L1 value, and / or other values, and the device may calculate a matrix model of the interference channel based on the at least one value. Figure 4 For example, the Uu UE 404 or the PC5 UE 406 may perform channel estimation on the interfering channel 416 based on receiving at least one first RS on the Uu link 412 or the PC5 link 414, respectively.

[0150] At 708, the device may determine a null space of the interfering channel based on the channel estimate for the interfering channel. For example, the device may find a null space of a matrix model of the interfering channel derived from performing the channel estimate, and the device may identify a beamforming and / or precoding configuration corresponding to the null space of the matrix. The beamforming and / or precoding configuration may reduce or minimize interference to the second communication link on the interfering channel. Figure 4 , for example, the Uu UE 404 or the PC5 UE 406 may determine the null space of the interfering channel 416 based on the channel estimation of the interfering channel 416 .

[0151] At 710, a device may communicate signaling on a first communication link of a first interface having a configuration to reduce interference to a second communication link of a second interface. For example, the device may transmit a signal on the first communication link along a vector defined by the null space of a matrix modeling an interference channel. In some aspects, the device may transmit non-precoded signaling (e.g., non-precoded SRS). In some aspects, the device may transmit a first signal that is orthogonal to the second signaling of the second communication link of the second interface on the interference channel. Figure 4 For example, the Uu UE 404 or the PC5 UE 406 may convey signaling on the Uu link 412 of the Uu interface or the PC5 link 414 of the PC5 interface, respectively, which signaling is configured to reduce interference on the interference channel 416 to the PC5 link 414 of the PC5 interface or the Uu link 412 of the Uu interface, respectively.

[0152] Figure 8 8 is a flow chart of a method 800 for wireless communication by a wireless communication device. The method 800 may be performed by a base station (e.g., base stations 102 / 180, 310, 402, 502) and / or another apparatus (e.g., apparatus 1002). According to various aspects, one or more of the illustrated operations may be swapped, omitted, and / or performed concurrently.

[0153] At 802, the base station may determine at least one resource of an interfering channel that interferes with a first communication link of the first interface and is associated with a second communication link of the second interface. For example, while the base station is transmitting and / or receiving on the Uu interface, the base station may detect signaling on the PC5 interface. The signal on the PC5 interface may be sidelink (or direct device) signaling and, therefore, may not be intended for the base station. The base station may measure the amount of interference, such as by measuring the SNR and / or RSRP, and the base station may compare the measurement to a threshold. When the measurement meets (e.g., is greater than or equal to) a threshold point at which interfering signaling becomes less likely to interrupt communications on the Uu interface, the interference from the second communication link may be negligible and potentially may not affect communications on the first communication link. However, when the measurement fails to meet the threshold, the signaling on the interfering channel may overlap with signaling to and / or from the base station. The base station may compare the measurements from each of the multiple resources on the Uu link 410 to find the set of resources that have the highest energy (considered as interference at the base station) or are most frequently broadcast relative to each other, and the base station may model the set of resources as the interfering channel for the first and second communication links. Reference Figure 4 For example, the base station 402 may determine at least one resource of the interference channel 416 that interferes with the Uu link 412 of the Uu interface and the PC5 link 414 of the PC5 interface.

[0154] At 804, the base station may transmit configuration information for communicating a reference signal set based on an interfering channel to at least one UE. According to various aspects, the configuration information may be transmitted via one of DCI or RRC signaling. In some aspects, the configuration information may indicate a configuration for at least one RS and / or at least one resource on which the at least one RS is to be transmitted. In some other aspects, the configuration information may indicate a configuration for communicating (e.g., transmitting or receiving) at least one first PMI in the presence of spatial interference on the interfering channel and / or for communicating at least one second PMI in the absence of spatial interference on the interfering channel. In a further aspect, the configuration information may indicate a configuration for communicating (e.g., transmitting or receiving) at least one second RS for determining precoding matrix information in the presence of spatial interference on the interfering channel and / or for communicating at least one third RS in the absence of spatial interference on the interfering channel. With reference Figure 4 For example, the base station 402 may transmit configuration information for communication based on the RS set of the interference channel 416 to at least one of the Uu UE 404 or the PC5 UE 406 .

[0155] At 806, the base station may communicate with the at least one UE on the first communication link of the first interface. That is, the base station may transmit data and / or control information to the UE on the Uu link of the Uu interface. Figure 4For example, the base station 402 may communicate data or control information with the Uu UE 404 over the Uu link 412 .

[0156] At 808, the base station may transmit at least one second RS and / or at least one third RS to the at least one UE. According to various aspects, the at least one second RS and / or at least one third RS may include at least one of an SSB, a CSI-RS, and / or a DM-RS, and a PT-RS. Figure 4 For example, the base station 402 may transmit at least one second RS and / or at least one third RS to the Uu UE 404 on the Uu link 412 .

[0157] At 810, the base station may receive at least one first PMI from at least one UE based on at least one second RS and / or receive at least one second PMI from at least one UE based on at least one third RS. The at least one first PMI may be associated with downlink communication on a first communication link of a first interface in the presence of spatial interference on an interfering channel. The at least one second PMI may be associated with downlink communication on a first communication link of a first interface in the absence of spatial interference on an interfering channel. Figure 4 For example, the base station 402 may receive the first PMI and / or the second PMI from the Uu UE 404 on the Uu link 412 based on . Figure 4 For example, the base station 402 may transmit at least one second RS and / or at least one third RS to the Uu UE 404 on the Uu link 412 .

[0158] At 812, the base station may receive at least one fourth RS from the at least one UE based on the presence of spatial interference on the interference channel and / or receive at least one fifth RS from the at least one UE in the absence of spatial interference on the interference channel. According to various aspects, the at least one fourth RS and / or the at least one fifth RS may include at least one of an SRS, a CSI-RS, and / or a DM-RS, and a PT-RS. Figure 4 For example, the base station 402 may receive at least one fourth RS and / or at least one fifth RS from the Uu UE 404 on the Uu link 412 .

[0159] At 814, the base station may determine the first precoding matrix information based on receiving at least one fourth RS and / or determine the second precoding matrix information based on receiving at least one fifth RS. For example, the base station may measure one or more values ​​(e.g., SNR, RSRP, etc.) indicating channel quality based on receiving the fourth RS in the presence of spatial interference on the interference channel, the base station may further model the channel between the base station and the UE, and the base station may select a precoding matrix based on the channel between the base station and the UE in the presence of spatial interference on the interference channel. In another example, the base station may measure one or more other values ​​(e.g., another SNR, another RSRP, etc.) indicating channel quality based on receiving at least one fifth RS in the absence of spatial interference on the interference channel, the base station may model another channel between the base station and the UE, and the base station may select another precoding matrix based on the another channel between the base station and the UE in the absence of spatial interference on the interference channel. Reference Figure 4 For example, the base station 402 may receive at least one fourth RS and / or at least one fifth RS from the Uu UE 404 on the Uu link 412 .

[0160] At 816, the base station may determine a configuration of at least one of a precoding or a transmission scheme associated with communications on the second communication link of the second interface. For example, the base station may identify shared resources on an interfering channel of the first communication link, and the base station may reconfigure a precoder and / or a transmission scheme (e.g., transmission power, transmission mode, etc.) for the UE based on interference on the shared resources of the interfering channel. Figure 4 , for example, the base station 402 may determine a configuration of at least one of a precoding or a transmission scheme for use in association with communications on the PC5 link 414 of the PC5 interface.

[0161] At 818, the base station may transmit to another UE a configuration for at least one of a precoding or transmission scheme to reduce interference signaling for the first communication link for the first interface on an interfering channel. Figure 4 For example, the base station 402 may transmit, to the first PC5 UE 406 , interference signaling for configuration of at least one of a precoding or a transmission scheme to reduce interference for a Uu link 414 of a Uu interface on an interference channel 416 .

[0162] Figure 9 9 is a diagram illustrating an example of a hardware implementation for a device 902. The device 902 may be a UE or similar device, or the device 902 may be a component of a UE or similar device. The device 902 may include a cellular baseband processor 904 (also referred to as a modem) and / or a cellular RF transceiver 922, which may be coupled together and / or integrated into the same package or module.

[0163] In some aspects, the device 902 may receive or include one or more subscriber identity module (SIM) cards 920, which may be one or more integrated circuits, chips, or similar circuitry, and which may be removable or embedded. The one or more SIM cards 920 may carry identification and / or authentication information, such as an International Mobile Subscriber Identity (IMSI) and / or IMSI-related keys. Additionally, the device 902 may include one or more of an application processor 906 coupled to a secure digital (SD) card 908 and a screen 910, a Bluetooth module 912, a wireless local area network (WLAN) module 914, a global positioning system (GPS) module 916, and / or a power supply 918.

[0164] The cellular baseband processor 904 communicates with the UE 108 or base station 102 / 180 via the cellular RF transceiver 922. The cellular baseband processor 904 may include computer-readable media / memory. The computer-readable media / memory may be non-transitory. The cellular baseband processor 904 is responsible for general processing, including the execution of software stored on the computer-readable media / memory. When executed by the cellular baseband processor 904, the software enables the cellular baseband processor 904 to perform the various functions described above. The computer-readable media / memory may also be used to store data manipulated by the cellular baseband processor 904 when executing the software. The cellular baseband processor 904 further includes a receiving component 930, a communication manager 932, and a transmitting component 934. The communication manager 932 includes one or more of the illustrated components. The components within the communication manager 932 may be stored in the computer-readable media / memory and / or configured as hardware within the cellular baseband processor 904.

[0165] exist Figure 3 In the context of , the cellular baseband processor 904 may be a component of the UE 350 and may include the memory 360 and / or at least one of the following: the TX processor 368, the RX processor 356, and / or the controller / processor 359. In one configuration, the device 902 may be a modem chip and / or may be implemented as the baseband processor 904, while in another configuration, the apparatus 902 may be the entire UE (e.g., Figure 3 UE 350) and may include some or all of the above modules, components and / or circuit systems explained in the context of device 902. In one configuration, the cellular RF transceiver 922 may be implemented as at least one of the transmitter 354TX and / or the receiver 354RX.

[0166] The receiving component 930 may be configured to receive signaling over a wireless channel, such as signaling from a base station 102 / 180 or a UE 108. The transmitting component 934 may be configured to transmit signaling over a wireless channel, such as signaling destined for a base station 102 / 180 or a UE 108. The communication manager 932 may coordinate or manage some or all wireless communications by the device 902, including wireless communications across the receiving component 930 and the transmitting component 934.

[0167] Receiving component 930 can provide some or all data and / or control information included in received signaling to communications manager 932, and communications manager 932 can generate some or all data and / or control information to be included in transmitted signaling and provide such data and / or control information to transmitting component 934. Communications manager 932 can include various illustrated components, including one or more components configured to process received data and / or control information and / or one or more components configured to generate data and / or control information for transmission.

[0168] The communication manager 932 may include one or more of a determining component 940 , a generating component 942 , a precoding component 944 , a detecting component 946 , an estimating component 948 , and a nulling component 950 .

[0169] In one configuration of the device 902, the receiving component 930 can be configured to receive configuration information, for example, in conjunction with Figure 6 602 . For example, the configuration information may be received from a base station 102 / 180 or another UE (e.g., UE 104 or UE 108). The configuration information may be received via at least one of DCI, RRC signaling, and / or SCI. The configuration information may indicate a spatial transmit filter with which the RS is transmitted. In some aspects, the configuration information may indicate a configuration for at least one RS and / or at least one resource on which the at least one RS is to be transmitted. In some other aspects, the configuration information may indicate a configuration for reporting at least one first PMI in the case of spatial interference on an interfering channel and / or reporting at least one second PMI in the case of no spatial interference on an interfering channel. In a further aspect, the configuration information may indicate a configuration for transmitting at least one second RS for determining precoding matrix information in the case of spatial interference on an interfering channel and / or transmitting at least one third RS in the case of no spatial interference on an interfering channel.

[0170] In some aspects, the configuration information may include a transmission configuration including at least one of a transmission scheme and / or a precoder. In some aspects, the transmission configuration may be applied to codebook-based transmissions, while in other aspects, the configured transmission may be applied to non-codebook-based transmissions. In yet other aspects, the transmission configuration may be received on an interface (e.g., Uu) that is different from the interface (e.g., PC5) on which the transmission configuration is to be applied. For example, the transmission configuration may be received from a base station 102 / 180, and the device may be configured to reduce interference caused to the base station 102 / 180.

[0171] The determining component 940 may be configured to determine at least one resource of an interfering channel interfering with a first communication link of a first interface and associated with a second communication link of a second interface, for example, as described in conjunction with Figure 6 604. In some aspects, determining component 940 can decode the received configuration information, and determining component 940 can identify an indication of the at least one resource of the interfering channel from the decoded received configuration information. In some other aspects, determining component 940 can measure the energy on the resources allocated to the link on which device 902 communicates with another device, or can measure the SNR on these resources. Determining component 940 can compare the measured energy and / or SNR with corresponding thresholds, and determining component 940 can determine whether the at least one resource is on the interfering channel based on the comparison.

[0172] The generating component 942 can generate at least one first RS for channel estimation of the interfering channel, for example, as combined with Figure 6 606. According to various aspects, the at least one first RS may include one of an SRS, a CSI-RS, a DM-RS, or a PT-RS. In some aspects, the at least one first RS may include a sequence selected based on the at least one first RS being intended for channel estimation. For example, first, the generation component 942 may select a sequence for the at least one first RS and may generate a digital signal, and then the generation component 942 may convert the digital signal into analog for transmission.

[0173] Transmitting component 934 can transmit at least one first RS on the at least one resource of the interfering channel, for example, as combined with Figure 6 That is, the transmission component 934 can transmit at least one first RS on the first communication link, and the first communication link can share the at least one resource with the second communication link (or the at least one resource can be adjacent to the resources of the second communication link and thus can leak into the resources of the second communication link).

[0174] The receiving component 930 and / or the transmitting component 934 can communicate over the first communication link of the first interface, for example, as described in conjunction with Figure 6 610. For example, the transmission component 934 can transmit signaling on the first communication link of the first interface and / or the reception component 930 can receive signaling on the first communication link of the first interface. When the device 902 is implemented at a base station or communicates with the base station 102 / 180 on an uplink / downlink, the first interface may include a Uu interface. When the device is implemented at a UE communicating with another UE on a side link, the first interface may include a PC5 interface.

[0175] The receiving component 930 can receive at least one second RS and / or at least one third RS from another device (e.g., base station 102 / 180), for example, as combined with Figure 6 In some aspects, the at least one second RS and / or the at least one third RS may include one or more of an SSB, a CSI-RS, a DM-RS, and / or a PT-RS. In some other aspects, the at least one second RS and / or the at least one third RS may include at least one SRS.

[0176] The precoding component 944 can determine at least one first PMI based on at least one second RS and / or determine at least one second PMI based on at least one third RS, for example, as combined with Figure 6 614. For example, first, the precoding component 944 can perform channel estimation for the first communication link (e.g., using at least one second RS and / or at least one third RS), and second, the precoding component 944 can calculate or operate the desired precoder based on the channel estimation. In some aspects, at least one first PMI can be determined with spatial interference on the interfering channel (e.g., using at least one second RS), and at least one second PMI can be determined without spatial interference on the interfering channel (e.g., using at least one third RS).

[0177] Transmitting component 934 can transmit at least one first PMI and / or at least one second PMI to the other device (eg, base station 102 / 180), for example, as combined with Figure 6 The 616 described.

[0178] The transmitting component 934 can transmit at least one fourth signal to the other device (e.g., base station 102 / 180) based on the presence of spatial interference on the interfering channel and / or transmit at least one fifth signal to the other device in the absence of spatial interference on the interfering channel, e.g., as combined with Figure 6As described in 618. For example, the at least one fourth signal and / or the at least one fifth signal may include another RS. In some aspects, the at least one fourth signal and / or the at least one fifth signal may implement a precoder calculation performed by the other device (e.g., base station 102 / 180 on the Uu link or another PC5 UE on the PC5 link). In some other aspects, the at least one fourth signal and / or the at least one fifth signal may be based on a channel estimate or a precoded signal received from the other device.

[0179] In another configuration of the device 902, the receiving component 930 can receive at least one first RS on at least one resource of the first communication link, for example, as combined with Figure 7 As described in 702. In some aspects, the at least one first RS may be a CSI-RS, a PT-RS, or a DM-RS. In some other aspects, the at least one first RS may be an SRS. Potentially, the at least one first RS may include a known sequence. In some aspects, the at least one first RS may be received on an interface different from the interface on which the device is communicating. For example, the at least one first RS may indicate the presence of another communication link that shares at least some resources with the communication link on which the device is communicating - for example, the at least one first RS may be received on an interfering channel.

[0180] The detection component 946 can detect an interfering channel based on at least one first RS, for example, as combined with Figure 7 As described in 704. The interfering channel may be on resources of the first communication link of the first interface, which are shared and / or adjacent to the second communication link of the second interface. For example, the detection component 946 may detect a sequence included in at least one first RS, and the detection component 946 may compare the detected sequence with at least one known sequence to determine whether the two match. In another example, the detection component 946 may measure the SNR on the resources of the first communication link, and the detection component 946 may perform SNR on the noise with a threshold. When the SNR is less than the threshold, the detection component 946 may detect the interfering channel.

[0181] The estimation component 948 can perform channel estimation on the interfering channel based on receiving the at least one first RS, for example, as combined with Figure 7 For example, the estimation component 948 can measure at least one value, such as L1-SNR and / or L1-RSRP, another L1 value, and / or other values, and the estimation component 948 can calculate a matrix model of the interference channel based on the at least one value.

[0182] The nulling component 950 can determine the null space of the interfering channel based on the channel estimate of the interfering channel, for example, as combined with Figure 7 For example, the nulling component 950 can find the null space of the matrix model of the interfering channel derived from performing the channel estimation, and the nulling component 950 can identify the beamforming and / or precoding configuration corresponding to the null space of the matrix. The beamforming and / or precoding configuration can reduce or minimize interference to the second communication link on the interfering channel.

[0183] Receiving component 930 and / or transmitting component 934 can communicate signaling on a first communication link of a first interface having a configuration to reduce interference to a second communication link of a second interface, e.g., as in conjunction with Figure 7 710. For example, the transmission component 934 can transmit a signal on the first communication link along a vector defined by the null space of the matrix modeling the interference channel. In some aspects, the transmission component 934 can transmit non-precoded signaling (e.g., non-precoded SRS). In some aspects, the transmission component 934 can transmit a first signal that is orthogonal to the second signaling of the second communication link of the second interface on the interference channel.

[0184] Device 902 may include executing Figure 6 and 7 Some or all of the additional components of the blocks, operations, signaling, etc. of the algorithms in the aforementioned flowcharts. Figure 6 and 7 Some or all of the blocks, operations, signaling, etc. in the aforementioned flow charts may be performed by a component, and the device 902 may include one or more of those components. These components may be one or more hardware components specifically configured to perform the process / algorithm, implemented by a processor configured to perform the process / algorithm, stored in a computer-readable medium for implementation by a processor, or some combination thereof.

[0185] In one configuration, the device 902, and in particular the cellular baseband processor 904, includes: means for transmitting a set of reference signals on a shared resource of a first communication link and a second communication link, the set of reference signals indicating an interfering channel on the shared resource; and means for communicating data or control information on the first communication link following transmission of the set of reference signals.

[0186] In one configuration, one of the first communication link or the second communication link is configured over a Uu interface, and the other of the first communication link or the second communication link is configured over a PC5 interface.

[0187] In one configuration, the apparatus 902, and in particular the cellular baseband processor 904, may further include means for receiving information configuring transmission of the reference signal set via DCI, RRC signaling, or SCI.

[0188] In one configuration, the information configuring transmission of a reference signal set includes information indicating a spatial transmit filter with which to transmit the reference signal set.

[0189] In one configuration, the reference signal set includes at least one of SRS, DM-RS, PT-RS, or CSI-RS.

[0190] In one configuration, the device 902, and in particular the cellular baseband processor 904, may further include: means for receiving a precoding matrix indicator (PMI), and the PMI is based on the presence of spatial interference on the interfering channel; and means for transmitting data or control information on the first communication link based on the PMI when the spatial interference is present on the interfering channel.

[0191] In one configuration, the device 902, and in particular the cellular baseband processor 904, may further include: means for receiving another PMI; and the another PMI is based on the absence of spatial interference on the interfering channel; and means for transmitting data or control information on the first communication link based on the another PMI when the spatial interference is not present on the interfering channel.

[0192] In one configuration, the device 902, and in particular the cellular baseband processor 904, may further include: means for transmitting a second reference signal set on the first communication link if the spatial interference is present on the interfering channel; and means for transmitting a third reference signal set on the first communication link if the spatial interference is not present on the interfering channel, and the PMI is based on the second reference signal set and the other PMI is based on the third reference signal set.

[0193] In one configuration, the device 902, and in particular the cellular baseband processor 904, may further include: means for calculating a PMI based on receiving a second set of reference signals on the first communication link when spatial interference is present on an interfering channel; means for transmitting information indicating the PMI on the first communication link; and means for receiving data or control information on the first communication link based on the PMI when the spatial interference is present on the interfering channel.

[0194] In one configuration, the device 902, and in particular the cellular baseband processor 904, may further include: means for calculating another PMI based on receiving a third reference signal set on the first communication link in the absence of spatial interference on the interfering channel; means for transmitting information indicating the another PMI on the first communication link; and means for receiving data or control information on the first communication link based on the another PMI when the spatial interference is not present on the interfering channel.

[0195] In one configuration, the channel over which the set of reference signals is transmitted is at least one of a non-precoded or non-whitened channel.

[0196] In one configuration, the channel over which the set of reference signals is transmitted is at least one of a precoded or whitened channel.

[0197] In one configuration, the wireless communication apparatus includes one of a UE or a base station.

[0198] In another configuration, the device 902, and in particular the cellular baseband processor 904, includes: means for detecting a signal on a shared resource of a first communication link and a second communication link, the signal indicating an interfering channel on the shared resource; means for performing channel estimation on the interfering channel based on detecting the signal; and means for communicating data or control information on the first communication link based on the channel estimate of the interfering channel.

[0199] In the other configuration, one of the first communication link or the second communication link is configured over the Uu interface, and the other of the first communication link or the second communication link is configured over the PC5 interface.

[0200] In this other configuration, the device 902, and in particular the cellular baseband processor 904, may further include: means for locating a null space associated with the interfering channel based on a channel estimate of the interfering channel; and means for transmitting a set of signals on the first communication link based on the locating of the null space, wherein the set of signals is transmitted on a precoded channel corresponding to the null space.

[0201] In this other configuration, when the signal on the shared resource is non-precoded, the precoded channel is in the null space of the interfering channel.

[0202] In this other configuration, the precoded channel is in the null space of the whitened interfering channel.

[0203] In the other configuration, the precoded channel is in the null space of effective precoded channels associated with the second communication link, and the set of signals on the precoded channel corresponding to the null space is orthogonal to another set of signals on other precoded channels associated with the second communication link.

[0204] In this other configuration, the signal on the shared resource includes at least one of SRS, DM-RS, PT-RS, or CSI-RS.

[0205] In this other configuration, the device 902, and in particular the cellular baseband processor 904, may further include: a device for communicating a PMI based on a reference signal set on the first communication link when spatial interference is present on an interfering channel; and a device for communicating data or control information on the first communication link based on the PMI when the spatial interference is present on the interfering channel.

[0206] In this other configuration, the device 902, and in particular the cellular baseband processor 904, may further include: a device for communicating another PMI based on another reference signal set on the first communication link when no spatial interference is present on the interfering channel; and a device for communicating data or control information on the first communication link based on the another PMI when the spatial interference is not present on the interfering channel.

[0207] The aforementioned means may be one or more of the aforementioned components in the device 902 configured to perform the functions recited by the aforementioned means. As described above, the device 902 may include the TX processor 368, the RX processor 356, and the controller / processor 359. Thus, in one configuration, the aforementioned means may be the TX processor 368, the RX processor 356, and the controller / processor 359 configured to perform the functions recited by the aforementioned means.

[0208] Figure 10 1 is a diagram illustrating an example of a hardware implementation for a device 1002. The device 1002 may be a base station or similar device or system, or the device 1002 may be a component of a base station or similar device or system. The device 1002 may include a baseband unit 1004. The baseband unit 1004 may communicate via a cellular RF transceiver. For example, the baseband unit 1004 may communicate with the UE 104 (such as for downlink and / or uplink communications) and / or communicate with the base station 102 / 180 (such as for IAB) via the cellular RF transceiver.

[0209] The baseband unit 1004 may include computer-readable media / memory, which may be non-transitory. The baseband unit 1004 is responsible for general processing, including the execution of software stored on the computer-readable media / memory. This software, when executed by the baseband unit 1004, enables the baseband unit 1004 to perform the various functions described above. The computer-readable media / memory may also be used to store data manipulated by the baseband unit 1004 when executing the software. The baseband unit 1004 further includes a receive component 1030, a communication manager 1032, and a transmit component 1034. The communication manager 1032 includes one or more of the illustrated components. The components within the communication manager 1032 may be stored in the computer-readable media / memory and / or configured as hardware within the baseband unit 1004. The baseband unit 1004 may be a component of the base station 310 and may include a memory 376 and / or at least one of the following: a TX processor 316, an RX processor 370, and a controller / processor 375.

[0210] The receiving component 1030 can be configured to receive signaling on a wireless channel, such as signaling from a Uu UE 104, a PC5 UE 106, or a base station 102 / 180. The transmitting component 1034 can be configured to transmit signaling on a wireless channel, such as signaling to a Uu UE 104, a PC5 UE 106, or a base station 102 / 180. The communication manager 1032 can coordinate or manage some or all wireless communications conducted by the device 1002, including wireless communications across the receiving component 1030 and the transmitting component 1034.

[0211] The receiving component 1030 can provide some or all of the data and / or control information included in the received signaling to the communication manager 1032, and the communication manager 1032 can generate some or all of the data and / or control information to be included in the transmitted signaling and provide the data and / or control information to the transmitting component 1034. The communication manager 1032 may include various illustrated components, including one or more components configured to process received data and / or control information and / or one or more components configured to generate data and / or control information for transmission. In some aspects, the generation of data and / or control information may include packetizing or otherwise reformatting the data and / or control information received from the core network (such as the core network 190 or the EPC 160) for transmission.

[0212] The communication manager 1032 can include one or more of a determining component 1040 , a precoding component 1042 , and / or a configuring component 1044 .

[0213] The determining component 1040 can determine at least one resource of an interfering channel that interferes with a first communication link of a first interface and is associated with a second communication link of a second interface, for example, as combined with Figure 8 802 as described. For example, when the transmission component 1034 is transmitting and / or receiving on the Uu interface, the determination component 1040 can detect signaling on the PC5 interface. The signal on the PC5 interface can be a side link (or direct device) signaling and therefore may not be intended for the device 1002. The determination component 1040 can measure the amount of interference, such as by measuring the SNR and / or RSRP, and the determination component 1040 can compare the measurement with a threshold. When the measurement meets (e.g., is greater than or equal to) the threshold point at which the interfering signaling becomes less likely to interrupt the communication on the Uu interface, the interference from the second communication link can be ignored and potentially may not affect the communication of the first communication link. However, when the measurement fails to meet the threshold, the signaling on the interfering channel may overlap with the signaling to and / or from the device 1002. The determination component 1040 can compare measurements from each of the multiple resources on the Uu link 410 to find the set of resources that have the highest energy (considered as interference at the base station) or are most frequently played relative to each other, and the determination component 1040 can model the set of resources as an interference channel for the first and second communication links.

[0214] Transmitting component 1034 can transmit configuration information to at least one of UEs 104, 106 for communicating a reference signal set based on an interfering channel, e.g., as described in conjunction with Figure 8 As described in 804 of . According to various aspects, the configuration information may be transmitted via one of DCI or RRC signaling. In some aspects, the configuration information may indicate a configuration for at least one RS and / or at least one resource on which the at least one RS is to be transmitted. In some other aspects, the configuration information may indicate a configuration for communicating (e.g., transmitting or receiving) at least one first PMI in the presence of spatial interference on an interfering channel and / or communicating at least one second PMI in the absence of spatial interference on an interfering channel. In a further aspect, the configuration information may indicate a configuration for communicating (e.g., transmitting or receiving) at least one second RS for determining precoding matrix information in the presence of spatial interference on an interfering channel and / or communicating at least one third RS in the absence of spatial interference on an interfering channel.

[0215] The receiving component 1030 and / or the transmitting component 1034 can communicate with at least one UE over the first communication link of the first interface, for example, as described in conjunction with Figure 8 For example, the transmission component 1034 can transmit data and / or control information to at least one of the UEs 104, 106 over a Uu link of the Uu interface.

[0216] Transmitting component 1034 can transmit at least one second RS and / or at least one third RS to at least one of UEs 104, 106, e.g., as combined with Figure 8 As described in 808. According to various aspects, the at least one second RS and / or the at least one third RS may include at least one of an SSB, a CSI-RS, and / or a DM-RS, and a PT-RS.

[0217] Receiving component 1030 can receive at least one first PMI from at least one of UEs 104, 106 based on at least one second RS and / or receive at least one second PMI based on at least one third RS, e.g., as in conjunction with Figure 8 As described in 810. At least one first PMI may be associated with downlink communication on the first communication link of the first interface in the presence of spatial interference on the interfering channel. At least one second PMI may be associated with downlink communication on the first communication link of the first interface in the absence of spatial interference on the interfering channel.

[0218] The receiving component 1030 can receive at least one fourth RS from at least one of the UEs 104, 106 based on the presence of spatial interference on the interfering channel and / or receive at least one fifth RS from at least one of the UEs 104, 106 without spatial interference on the interfering channel, e.g., as in conjunction with Figure 8 As described in 812. According to various aspects, the at least one fourth RS and / or the at least one fifth RS may include at least one of an SRS, a CSI-RS, and / or a DM-RS, and a PT-RS.

[0219] The precoding component 1042 can determine the first precoding matrix information based on receiving at least one fourth RS and / or determine the second precoding matrix information based on receiving at least one fifth RS, for example, as combined with Figure 8814. For example, the precoding component 1042 may measure one or more values ​​indicating channel quality (e.g., SNR, RSRP, etc.) based on receiving the fourth RS in the presence of spatial interference on the interfering channel, the precoding component 1042 may further model the channel between the device 1002 and at least one of the UEs 104 and 106, and the precoding component 1042 may select a precoding matrix based on the channel between the device 1002 and at least one of the UEs 104 and 106 in the presence of spatial interference on the interfering channel. In another example, the precoding component 1042 may measure one or more other values ​​indicative of channel quality (e.g., another SNR, another RSRP, etc.) based on receiving at least one fifth RS in the absence of spatial interference on the interfering channel, the precoding component 1042 may model another channel between the device 1002 and at least one of the UEs 104, 106, and the precoding component 1042 may select another precoding matrix based on the another channel between the device 1002 and at least one of the UEs 104, 106 in the absence of spatial interference on the interfering channel.

[0220] Configuration component 1044 can determine a configuration for at least one of a precoding or a transmission scheme associated with communications on a second communication link of a second interface, e.g., as described in conjunction with Figure 8 For example, as described in 816, the configuration component 1044 can identify shared resources on an interfering channel of the first communication link, and the configuration component 1044 can reconfigure a precoder and / or a transmission scheme (e.g., transmission power, transmission mode, etc.) for at least one of the UEs 104, 106 based on the interference on the shared resources of the interfering channel.

[0221] Transmitting component 1034 can transmit to the other of UEs 104, 106 a configuration for at least one of a precoding or transmission scheme to reduce interference signaling on an interfering channel for a first communication link of a first interface, e.g., as in conjunction with Figure 8 818 described.

[0222] Device 1002 may include executing Figure 6 and 8 Some or all of the additional components of the blocks, operations, signaling, etc. of the algorithms in the aforementioned flowcharts. Figure 6 and 8 Some or all of the blocks, operations, signaling, etc. in the aforementioned flow charts may be performed by a component, and the device 1002 may include one or more of those components. These components may be one or more hardware components specifically configured to perform the process / algorithm, implemented by a processor configured to perform the process / algorithm, stored in a computer-readable medium for implementation by a processor, or some combination thereof.

[0223] In one configuration, the device 1002, and in particular the baseband unit 1004, includes: means for configuring a UE to communicate a reference signal set based on an interference channel, the interference channel comprising shared resources of a first communication link and a second communication link; and means for communicating data or control information on the first communication link after configuring the communication by the UE.

[0224] In one configuration, the apparatus 1002, and in particular the baseband unit 1004, includes means for detecting interference signaling on an interfering channel; and means for configuring at least one of a transmission scheme or a precoder for the UE based on the interfering signal, wherein the interfering signal is transmitted by the UE.

[0225] In one configuration, the interfering signal includes at least one of an SRS, a DM-RS, a PT-RS, or a CSI-RS.

[0226] In one configuration, one of the first communication link or the second communication link is configured over a Uu interface, and the other of the first communication link or the second communication link is configured over a PC5 interface.

[0227] In one configuration, the device 1002, and in particular the baseband unit 1004, includes: means for communicating a PMI based on a reference signal set on a first communication link when spatial interference is present on an interfering channel; and means for communicating data or control information on the first communication link based on the PMI when the spatial interference is present on the interfering channel.

[0228] In one configuration, the device 1002, and in particular the baseband unit 1004, includes: a device for communicating another PMI based on another reference signal set on the first communication link when no spatial interference is present on the interfering channel; and a device for communicating data or control information on the first communication link based on the another PMI when the spatial interference is not present on the interfering channel.

[0229] The aforementioned means may be one or more of the aforementioned components in the device 1002 configured to perform the functions recited by the aforementioned means. As described above, the device 1002 may include the TX processor 316, the RX processor 370, and the controller / processor 375. Thus, in one configuration, the aforementioned means may be the TX processor 316, the RX processor 370, and the controller / processor 375 configured to perform the functions recited by the aforementioned means.

[0230] The specific order or hierarchy of each block or operation in each of the above-described processes, flow charts, and other diagrams disclosed herein is an illustration of an example approach. Based on design preferences, one of ordinary skill in the art will readily recognize that the specific order or hierarchy of each block in each of these processes, flow charts, and other diagrams may be rearranged, omitted, and / or performed concurrently without departing from the scope of this disclosure. In addition, some blocks may be combined or omitted. The accompanying method claims present the elements of the various blocks in an example order and are not meant to be limited to the specific order or hierarchy presented.

[0231] The following examples are merely illustrative and may be combined with other embodiments or aspects of the teachings described herein without limitation.

[0232] Example 1 is a method for performing wireless communication at a wireless communication device, comprising: transmitting a reference signal set on a shared resource of a first communication link and a second communication link, the reference signal set indicating an interference channel on the shared resource; and conveying data or control information on the first communication link after transmission of the reference signal set.

[0233] Example 2 may be the method of Example 1, wherein one of the first communication link or the second communication link is configured on a Uu interface, and the other of the first communication link or the second communication link is configured on a PC5 interface.

[0234] Example 3 may be the method of Example 1, further comprising: receiving information configuring transmission of the reference signal set via DCI, RRC signaling, or SCI.

[0235] Example 4 may be the method of Example 3, wherein the information configuring the transmission of the reference signal set includes information indicating a spatial transmit filter with which to transmit the reference signal set.

[0236] Example 5 may be the method of Example 1, wherein the reference signal set includes at least one of an SRS, a DM-RS, a PT-RS, or a CSI-RS.

[0237] Example 6 can be the method of Example 1, further comprising: receiving a PMI, wherein the PMI is based on spatial interference present on the interference channel; and transmitting the data or control information on the first communication link based on the PMI when the spatial interference is present on the interference channel.

[0238] Example 7 can be the method of Example 6, further including: receiving another PMI, wherein the another PMI is based on the absence of the spatial interference on the interference channel; and transmitting the data or control information on the first communication link based on the another PMI when the spatial interference does not exist on the interference channel.

[0239] Example 8 can be the method of Example 7, further including: transmitting a second reference signal set on the first communication link when the spatial interference exists on the interference channel; and transmitting a third reference signal set on the first communication link when the spatial interference does not exist on the interference channel, wherein the PMI is based on the second reference signal set and the other PMI is based on the third reference signal set.

[0240] Example 9 can be the method of Example 1, further including: calculating the PMI based on receiving a second reference signal set on the first communication link when spatial interference exists on the interference channel; transmitting information indicating the PMI on the first communication link; and receiving the data or control information on the first communication link based on the PMI when the spatial interference exists on the interference channel.

[0241] Example 10 can be the method of Example 9, further including: calculating another PMI based on receiving a third reference signal set on the first communication link in the absence of spatial interference on the interference channel; transmitting information indicating the another PMI on the first communication link; and receiving the data or control information on the first communication link based on the another PMI when the spatial interference does not exist on the interference channel.

[0242] Example 11 may be the method of Example 1, wherein the channel over which the set of reference signals is transmitted is at least one of a non-precoded or non-whitened channel.

[0243] Example 12 may be the method of Example 1, wherein the channel over which the set of reference signals is transmitted is at least one of a precoded or whitened channel.

[0244] Example 13 may be the method of Example 1, wherein the wireless communication apparatus comprises one of a UE or a base station.

[0245] Example 14 is a method for performing wireless communication at a wireless communication device, comprising: detecting a signal on a shared resource of a first communication link and a second communication link, the signal indicating an interference channel on the shared resource; performing channel estimation on the interference channel based on detecting the signal; and communicating data or control information on the first communication link based on the channel estimation of the interference channel.

[0246] Example 15 may be the method of Example 14, wherein one of the first communication link or the second communication link is configured on a Uu interface, and the other of the first communication link or the second communication link is configured on a PC5 interface.

[0247] Example 16 can be the method of Example 14, further comprising: locating a null space associated with the interference channel based on the channel estimate of the interference channel; and transmitting a signal set on the first communication link based on the locating of the null space, wherein the signal set is transmitted on a precoded channel corresponding to the null space.

[0248] Example 17 may be the method of Example 16, wherein when the signal on the shared resource is non-precoded, the precoded channel is in the null space of the interfering channel.

[0249] Example 18 can be the method of Example 16, wherein the precoded channel is in the null space of the whitened interfering channel.

[0250] Example 19 can be the method of Example 16, wherein the precoded channel is in the null space of the effective precoded channel associated with the second communication link, and the signal set on the precoded channel corresponding to the null space is orthogonal to another signal set on the other precoded channel associated with the second communication link.

[0251] Example 20 may be the method of Example 14, wherein the signal on the shared resource includes at least one of an SRS, a DM-RS, a PT-RS, or a CSI-RS.

[0252] Example 21 can be the method of Example 14, further including: communicating the PMI based on the reference signal set on the first communication link when spatial interference exists on the interference channel; and communicating the data or control information on the first communication link based on the PMI when the spatial interference exists on the interference channel.

[0253] Example 22 can be the method of Example 21, further including: communicating another PMI based on another reference signal set on the first communication link when no spatial interference exists on the interference channel; and communicating the data or control information on the first communication link based on the another PMI when the spatial interference does not exist on the interference channel.

[0254] Example 23 can be a method for performing wireless communication at a base station, comprising: configuring a UE to communicate a reference signal set based on an interference channel, the interference channel comprising shared resources of a first communication link and a second communication link; and conveying data or control information on the first communication link after configuring the communication performed by the UE.

[0255] Example 24 may be the method of Example 23, further comprising: detecting an interference signal on the interference channel; and configuring at least one of a transmission scheme or a precoder for the UE based on the interference signal, wherein the interference signal is transmitted by the UE.

[0256] Example 25 may be the method of Example 23, wherein the interference signal includes at least one of an SRS, a DM-RS, a PT-RS, or a CSI-RS.

[0257] Example 26 may be the method of Example 23, wherein one of the first communication link or the second communication link is configured on a Uu interface, and the other of the first communication link or the second communication link is configured on a PC5 interface.

[0258] Example 27 can be the method of Example 23, further including: communicating the PMI based on the reference signal set on the first communication link when spatial interference exists on the interference channel; and communicating the data or control information on the first communication link based on the PMI when the spatial interference exists on the interference channel.

[0259] Example 28 can be the method of Example 27, further including: communicating another PMI based on another reference signal set on the first communication link when no spatial interference exists on the interference channel; and communicating the data or control information on the first communication link based on the another PMI when the spatial interference does not exist on the interference channel.

[0260] The foregoing 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 universal principles defined herein may be applied to other aspects. Thus, the claims are not intended to be limited to the aspects shown herein, but should be given the full scope consistent with the language. Accordingly, the language employed herein is not intended to limit the scope of the claims to only those aspects shown herein, but should be given the full scope consistent with the language of the claims.

[0261] As an example, the language "determine" may encompass a wide variety of actions and, therefore, may not be limited to the concepts and aspects explicitly described or illustrated by this disclosure. In some contexts, "determine" may include calculating, computing, processing, measuring, deriving, investigating, looking up (e.g., looking up in a table, database, or another data structure), ascertaining, resolving, selecting, choosing, establishing, and the like. In some other contexts, "determining" may include some communication and / or memory operation / procedure by which some information or value is obtained, such as "receiving" (e.g., receiving information), "accessing" (e.g., accessing data in a memory), "detecting," and the like.

[0262] As another example, a reference to a singular element is not intended to mean "there is and only one" (unless specifically stated as such), but "one or more". Specifically, a reference to a singular element is not intended to mean "there is and only one" (unless specifically stated as such), but "one or more". Terms such as "if", "when..." and "at..." should be interpreted as meaning "under the condition", rather than implying a direct temporal relationship or reaction. That is, these phrases (e.g., "when...") do not imply an immediate action in response to the occurrence of an action or during the occurrence of an action, but only imply that an action will occur if the condition is met, without the need for a specific or immediate time constraint for the action to occur. The wording "exemplary" is used herein to mean "serving as an example, instance, or illustration". Any aspect described herein as "exemplary" is not necessarily to be interpreted as being superior to or superior to other aspects. Unless specifically stated otherwise, the term "some / certain" 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 multiple A, multiple B, or multiple 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 only A, only B, only C, A and B, A and C, B and C, or A, B, and C, where any such combination may include one or more of A, B, or C. All structural and functional equivalents to the elements of the various aspects described throughout this disclosure that are now or later known to those of ordinary skill in the art are expressly incorporated herein by reference and are intended to be encompassed by the claims. In addition, nothing disclosed herein is intended to be dedicated to the public regardless of whether such disclosure is explicitly recited in the claims. The terms “module,” “mechanism,” “element,” “device,” etc. may not be substitutes for the term “means.” Thus, no claim element should be construed as means-plus-function unless the element is explicitly recited using the phrase “means for.”

Claims

1. An apparatus for wireless communication, comprising: Memory; as well as at least one processor coupled to the memory and configured to: transmitting a set of reference signals on a shared resource of a first communication link on one of a Uu interface or a PC5 interface and a second communication link on the other of the Uu interface or the PC5 interface, the set of reference signals indicating an interference channel between the Uu interface and the PC5 interface on the shared resource; as well as Data or control information is communicated over the first communication link following transmission of the set of reference signals.

2. The apparatus of claim 1 , wherein the at least one processor is further configured to: Information for configuring transmission of the reference signal set is received via downlink control information DCI, radio resource control RRC signaling, or sidelink control information SCI.

3. The apparatus of claim 2 , wherein the information configuring the transmission of the reference signal set comprises: Information indicating a spatial transmit filter used to transmit the set of reference signals. 4 . The apparatus of claim 1 , wherein the reference signal set comprises at least one of a sounding reference signal (SRS), a demodulation reference signal (DM-RS), a phase tracking reference signal (PT-RS), or a channel state information reference signal (CSI-RS).

5. The apparatus of claim 1 , wherein the at least one processor is further configured to: receiving a precoding matrix indicator (PMI), wherein the PMI is based on spatial interference present on the interfering channel; and The data or control information is transmitted on the first communication link based on the PMI when the spatial interference is present on the interfering channel.

6. The apparatus of claim 5, wherein the at least one processor is further configured to: receiving another precoding matrix indicator (PMI), wherein the another PMI is based on the absence of the spatial interference on the interfering channel; and The data or control information is transmitted on the first communication link based on the other PMI when the spatial interference is not present on the interfering channel.

7. The apparatus of claim 6, wherein the at least one processor is further configured to: transmitting a second set of reference signals on the first communication link if the spatial interference is present on the interfering channel; and transmitting a third set of reference signals on the first communication link in the absence of the spatial interference on the interfering channel, wherein The PMI is based on the second reference signal set and the another PMI is based on the third reference signal set.

8. The apparatus of claim 1 , wherein the at least one processor is further configured to: calculating a precoding matrix indicator (PMI) based on receiving a second set of reference signals on the first communication link in the presence of spatial interference on the interfering channel; transmitting information indicating the PMI over the first communication link; as well as The data or control information is received on the first communication link based on the PMI when the spatial interference is present on the interfering channel.

9. The apparatus of claim 8, wherein the at least one processor is further configured to: calculating another PMI based on receiving a third set of reference signals on the first communication link in the absence of spatial interference on the interfering channel; transmitting information indicating the other PMI over the first communication link; and The data or control information is received on the first communication link based on the other PMI when the spatial interference is not present on the interfering channel.

10. The apparatus of claim 1, wherein a channel over which the set of reference signals is transmitted is at least one of a precoded or whitened channel.

11. The device of claim 1, wherein the wireless communication device comprises one of a user equipment (UE) or a network node.

12. An apparatus for wireless communication, comprising: Memory; as well as at least one processor coupled to the memory and configured to: detecting a signal on a shared resource of a first communication link on one of a Uu interface or a PC5 interface and a second communication link on the other of the Uu interface or the PC5 interface, the signal indicating an interfering channel between the Uu interface and the PC5 interface on the shared resource; performing channel estimation on the interfering channel based on the detection of the signal; and Data or control information is communicated over the first communication link based on the channel estimate of the interfering channel.

13. The apparatus of claim 12, wherein the at least one processor is further configured to: locating a null space associated with the interfering channel based on the channel estimate of the interfering channel; and A set of signals is transmitted over the first communication link based on the positioning of the null space, wherein the set of signals is transmitted over a precoded channel corresponding to the null space.

14. The apparatus of claim 13, wherein when the signal on the shared resource is non-precoded, the precoded channel is in the null space of the interfering channel.

15. The apparatus of claim 13, wherein the precoded channel is in the null space of a whitened interfering channel.

16. The apparatus of claim 13 , wherein the precoded channel is in the null space of effective precoded channels associated with the second communication link, and the set of signals on the precoded channel corresponding to the null space is orthogonal to another set of signals on another precoded channel associated with the second communication link.

17. The apparatus of claim 12, wherein the signal on the shared resource comprises at least one of a sounding reference signal (SRS), a demodulation reference signal (DM-RS), a phase tracking reference signal (PT-RS), or a channel state information reference signal (CSI-RS).

18. The apparatus of claim 12, wherein the at least one processor is further configured to: communicating a precoding matrix indicator (PMI) based on a set of reference signals on the first communication link in the presence of spatial interference on the interfering channel; and The data or control information is communicated over the first communication link based on the PMI when the spatial interference is present on the interfering channel.

19. The apparatus of claim 18, wherein the at least one processor is further configured to: communicating another precoding matrix indicator (PMI) based on another set of reference signals on the first communication link in the absence of spatial interference on the interfering channel; and The data or control information is transmitted on the first communication link based on the other PMI when the spatial interference is not present on the interfering channel.

20. An apparatus for wireless communication at a network node, comprising: Memory; as well as at least one processor coupled to the memory and configured to: configuring a user equipment (UE) to communicate a set of reference signals based on an interfering channel, the interfering channel comprising a shared resource between a Uu interface and a PC5 interface, a first communication link being configured over one of the Uu interface or the PC5 interface and a second communication link being configured over the other of the Uu interface or the PC5 interface; as well as Data or control information is communicated over the first communication link after configuring the communication by the UE.

21. The apparatus of claim 20, wherein the at least one processor is further configured to: detecting an interference signal on the interference channel; and At least one of a transmission scheme or a precoder is configured for the UE based on the interfering signal, wherein the interfering signal is transmitted by the UE.

22. The apparatus of claim 21, wherein the interference signal comprises at least one of a sounding reference signal (SRS), a demodulation reference signal (DM-RS), a phase tracking reference signal (PT-RS), or a channel state information reference signal (CSI-RS).

23. The apparatus of claim 20, wherein the at least one processor is further configured to: communicating a precoding matrix indicator (PMI) based on a set of reference signals on the first communication link in the presence of spatial interference on the interfering channel; and The data or control information is communicated over the first communication link based on the PMI when the spatial interference is present on the interfering channel.

24. The apparatus of claim 23, wherein the at least one processor is further configured to: communicating another precoding matrix indicator (PMI) based on another set of reference signals on the first communication link in the absence of spatial interference on the interfering channel; and The data or control information is transmitted on the first communication link based on the other PMI when the spatial interference is not present on the interfering channel.

25. A method of wireless communication at a device, comprising: transmitting a set of reference signals on a shared resource between a Uu interface and a PC5 interface, a first communication link being configured on one of the Uu interface or the PC5 interface and a second communication link being configured on the other of the Uu interface or the PC5 interface, the set of reference signals being configured to indicate an interfering channel on the shared resource; as well as Data or control information is communicated over the first communication link following transmission of the set of reference signals.

26. The method of claim 25, further comprising: Information for configuring transmission of the reference signal set is received via downlink control information DCI, radio resource control RRC signaling, or sidelink control information SCI.

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