Beam training technology in full-duplex wireless communications

Abstract

Aspects described herein relate to measuring a signal quality of at least one receive beam while transmitting via each of one or more transmit beams associated with at least one receive beam in full-duplex communication, and determining a transmit / receive beam pair to use in full-duplex communication with one or more other nodes based at least in part on the measured signal qualities associated with each of the one or more transmit beams and the at least one receive beam.

Description

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This patent application claims priority to provisional patent application No. 62 / 931,020, entitled “Techniques for Beam Training in Full Duplex Wireless Communications,” filed on November 5, 2019, and U.S. patent application No. 17 / 076,397, entitled “Techniques for Beam Training in Full Duplex Wireless Communications,” filed on October 21, 2020, both of which have been assigned to the assignee of this application, and their entire contents are expressly incorporated herein by reference. Technical Field

[0003] Generally speaking, aspects of the present disclosure relate to wireless communication systems, and more particularly, aspects of the present disclosure relate to determining beams for use in full-duplex wireless communication. Background Art

[0004] Wireless communication systems are widely deployed to provide various types of communication content, such as voice, video, packet data, messaging, broadcast, and so on. These systems may be multiple-access systems capable of supporting communication with multiple users by sharing available system resources (e.g., time, frequency, and power). Examples of such multiple-access systems include code division multiple access (CDMA) systems, time division multiple access (TDMA) systems, frequency division multiple access (FDMA) systems, orthogonal frequency division multiple access (OFDMA) systems, and single-carrier frequency division multiple access (SC-FDMA) systems.

[0005] These multiple access technologies have been adopted in various telecommunication standards to provide a common protocol that enables different wireless devices to communicate on a city-wide, national-wide, regional-wide, and even global scale. For example, the fifth generation (5G) wireless communication technology, which may be referred to as 5G New Radio (5G NR), is envisioned to extend and support various usage scenarios and applications with respect to the current mobile network generation. In one aspect, 5G communication technologies may include: enhanced mobile broadband to address the use case of people-centric access to multimedia content, services, and data; ultra-reliable low-latency communication (URLLC) with specifications for latency and reliability; and massive machine-type communication, which may allow a very large number of connected devices to transmit relatively small amounts of non-latency-sensitive information.

[0006] In some wireless communication technologies, access points and / or other nodes may be configured for full-duplex (FD) communication, where the access points or other nodes may simultaneously transmit and receive over wireless communication resources within the same frequency band or component carrier. Access points may communicate with each other over one or more backhaul links; however, clutter may be present in the wireless communication path between two access points or other nodes, which may affect the signal-to-interference-plus-noise ratio (SINR) at one or more of the access points or other nodes. Summary of the Invention

[0007] To provide a basic understanding of one or more aspects of the present invention, a brief summary of these aspects is provided below. This summary is not an exhaustive overview of all contemplated aspects, nor is it intended to identify key or critical elements of all aspects, or to describe 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 detailed description that follows.

[0008] According to one example, a method for wireless communication is provided. The method includes measuring a signal quality at at least one receive beam while transmitting via each of one or more transmit beams associated with the at least one receive beam in full-duplex communication, and determining a transmit / receive beam pair to use in full-duplex communication with one or more other nodes based at least in part on the measured signal qualities associated with each of the one or more transmit beams and the at least one receive beam.

[0009] In another example, an apparatus for wireless communication is provided, the apparatus comprising a transceiver, a memory configured to store instructions, and one or more processors communicatively coupled to the memory and the transceiver. The one or more processors are configured to execute the instructions to perform the operations of the methods and examples described above and further herein. In another aspect, an apparatus for wireless communication is provided, the apparatus comprising means for performing the operations of the methods and examples described above and further herein. In another aspect, a computer-readable medium is provided, the computer-readable medium comprising code executable by one or more processors to perform the operations of the methods and examples described above and further herein.

[0010] In one aspect, an apparatus for wireless communication is provided, the apparatus comprising a transceiver, a memory configured to store instructions, and one or more processors communicatively coupled to the transceiver and the memory. The one or more processors are configured to: measure a signal quality at at least one receive beam when transmitting in full-duplex communication via each of one or more transmit beams associated with the at least one receive beam; and determine a transmit / receive beam pair to use in full-duplex communication with one or more other nodes based at least in part on the measured signal qualities associated with each of the one or more transmit beams and the at least one receive beam.

[0011] In another aspect, an apparatus for wireless communication is provided, the apparatus comprising: means for measuring a signal quality at at least one receive beam when transmitting through each of one or more transmit beams associated with the at least one receive beam in full-duplex communication; and means for determining a transmit / receive beam pair to be used in full-duplex communication with one or more other nodes based at least in part on the measured signal qualities associated with each of the one or more transmit beams and the at least one receive beam.

[0012] In another aspect, a computer-readable medium including code executable by one or more processors for wireless communication is provided. The code includes code for measuring a signal quality at at least one receive beam when transmitting through each of one or more transmit beams associated with the at least one receive beam in full-duplex communication; and code for determining a transmit / receive beam pair to use in full-duplex communication with one or more other nodes based at least in part on the measured signal qualities associated with each of the one or more transmit beams and the at least one receive beam.

[0013] To accomplish the foregoing and related ends, one or more aspects comprise the features fully described below and particularly pointed out in the claims. The following description and the accompanying drawings describe in detail certain exemplary features of the one or more aspects. However, these features are merely illustrative of the various ways in which the principles of these various aspects may be employed, and this description is intended to include all such aspects and their equivalents. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] The disclosed aspects of the present invention are described below in conjunction with the accompanying drawings, which are provided to illustrate and not to limit the disclosed aspects, wherein like reference numerals represent like elements, and wherein:

[0015] Figure 1 According to various aspects of the present disclosure, an example of a wireless communication system is shown;

[0016] Figure 2 is a block diagram illustrating an example of a base station according to various aspects of the present disclosure;

[0017] Figure 3 is a flow chart illustrating an exemplary method for determining transmit / receive beam pairs according to various aspects of the present disclosure;

[0018] Figure 4 is an example of a node for determining transmit / receive beam pairs in the presence of clutter, according to various aspects of the present disclosure; and

[0019] Figure 5 is a block diagram illustrating an example of a MIMO communication system including a base station in backhaul communication according to various aspects of the present disclosure. DETAILED DESCRIPTION

[0020] Various aspects will now be described with reference to the accompanying drawings. In the following description, for purposes of illustration, numerous specific details are provided to provide a thorough understanding of one or more aspects. However, it will be apparent that these aspects may be implemented without these specific details.

[0021] The described features generally relate to determining a beam to be used in transmitting and / or receiving full-duplex (FD) wireless communications. For example, a node may determine a desired (or undesired) transmit / receive beam pair, or a transmit / receive beam pair to be avoided or not avoided, in a wireless communication environment, and may determine the beam to be used based on the determined pair. In one example, FD communications at a node may be affected by clutter caused by an object that interferes with the wireless signal. For example, an object may cause a transmitted signal to be reflected back to an access point, and in FD communications, the reflected signal may be received and may interfere with other received wireless communications. In this regard, for example, when determining a transmit / receive beam pair for wireless communications, a transmit / receive beam pair with excessive noise from clutter may be determined and avoided. Similarly, in one example, a transmit / receive beam pair with desired characteristics (e.g., a beam pair determined to have a low noise level and / or determined not to be avoided) may be determined and used for wireless communications.

[0022] As referred to herein, FD communication may include a single node (e.g., access point) transmitting and receiving (e.g., simultaneously) on communication resources in the same frequency band and / or on communication resources in the same component carrier (CC). In one example, FD communication may include intra-band full-duplex (IBFD), where a single node may transmit and receive on the same time and frequency resources, and the downlink and uplink may share the same IBFD time / frequency resources (e.g., fully overlapping and / or partially overlapping). In another example, FD communication may include sub-band FD (also known as "flexible duplex"), where a single node may transmit and receive simultaneously on different frequency resources within the same frequency band (or on communication resources in the same CC), where the downlink resources and uplink resources may be separated in the frequency domain (e.g., by a guard band). For example, the guard band in sub-band FD may be on the order of a resource block (RB) width (e.g., 180 kilohertz (kHz) for 3rd Generation Partnership Project (3GPP) Long Term Evolution (LTE) and 5th Generation (5G) New Radio (NR), 60 and 120 kHz for NR, etc.). This can be distinguished from the guard band in frequency division duplex (FDD) communications defined in LTE and NR, which may be 5 megahertz (MHz) or higher and define related resources in FDD between frequency bands, but not within the same frequency band (or resources in the same CC) as in sub-band FD communications.

[0023] Because simultaneous transmission / reception is possible, FD systems can have higher rates and spectral efficiency than half-duplex systems. In addition, due to the effects of clutter, enhanced self-interference (and therefore reduced signal-to-interference-plus-noise ratio (SINR)) may be caused from the transmitting portion of the system to the receiving portion of the system, as described herein. For example, clutter can include any object that can act as a reflector, diffractor, scatterer, etc., redirecting signal energy to a different (e.g., unintended) direction, such objects including stationary objects (e.g., buildings, trees, etc.), moving objects (e.g., cars, etc.), etc. Thus, in one example, clutter can be static or dynamic, and the associated objects can be mobile (e.g., moving), or time-varying in terms of sensing gain. The clutter around an IAB node can be dense or sparse, and may depend on the local geometry and / or channel environment. In some examples of FD communication, various antenna configurations can be used within a device (e.g., an access point) to facilitate FD communication. In one configuration, the transmit antenna array can be spatially separated or isolated from the receive antenna array within the device to reduce leakage (e.g., self-interference) from the transmit antenna array to the receive antenna array. The circuitry used to achieve this isolation may be more suitable for backhaul or customer premises equipment (CPE) type applications. In another example, the antenna array configuration for non-FD communications can use the same antenna array for either transmit or receive (but not both simultaneously).

[0024] Aspects described herein relate to mitigating the impact of clutter on SINR degradation, which can be based at least in part on determining a desired beam for transmitting and / or receiving wireless communications at a node. For example, determining the desired beam can be based on determining a beam not to be avoided based on associated signal characteristics, or determining a beam not in a list of beams to be avoided based on associated signal characteristics. In one example, beam training can be performed between nodes to determine transmit / receive beam pairs that cannot be avoided for communication between the nodes. In one example, as part of beam training, the nodes can determine whether one or more beam pairs exhibit undesirable interference caused by clutter and can accordingly at least attempt to avoid using these beam pairs, which can mitigate the impact of SINR degradation at the node. For example, if one or more beam pairs are determined to be avoided, the access node can attempt to use a different, more desirable beam pair. In one example, if one or more beam pairs are configured for the access node, the access node can replace at least one of these beams with a zero-shaped beam to direct energy in a desired direction and away from self-interference. In another example, if one or more beam pairs to be avoided are determined or configured for the access node, the access node may indicate the beam pairs to be avoided to one or more other nodes in an attempt to avoid assignment of the one or more beam pairs (or may indicate beam pairs that should not be avoided when attempting to receive a desired beam pair assignment). In another example, if one or more beam pairs to be avoided are determined or configured for the access node, the access node may request a different beam pair.

[0025] In any case, beams that cause excessive self-interference due to clutter can be determined and / or avoided to improve the quality / efficiency of backhaul communications or other communications between other nodes. As mentioned herein, a node may include substantially any type of node capable of FD wireless communication, which may include any class of devices defined in the Third Generation Partnership Project (3GPP), such as UEs, IAB nodes, CPEs, base stations or other access points, relay nodes, repeaters (e.g., smart or dumb repeaters), etc. that can communicate via access links, side links, etc., as further described herein.

[0026] Refer to the following Figure 1-5 Let's give the described features in more detail.

[0027] As used in this application, the terms "component," "module," "system," and the like are intended to include computer-related entities such as, but not limited to, hardware, software, a combination of hardware and software, or software in operation. For example, a component can be, but not limited to, a process running on a processor, a processor, an object, an executable file, a thread of execution, a program, and / or a computer. For example, both an application running on a computing device and the computing device can be components. One or more components can exist in a process and / or thread of execution, and a component can be located in a computer and / or distributed between two or more computers. In addition, these components can be executed from various computer-readable media having various data structures stored thereon. These components can communicate in the form of local and / or remote processes, such as based on signals having one or more data packets (e.g., data from a component that interacts with another component in a local system, a distributed system, and / or interacts with other systems in the form of signals over a network such as the Internet). Software shall be construed broadly to mean instructions, instruction sets, code, code segments, program code, programs, subroutines, software modules, applications, software applications, software packages, routines, subroutines, objects, executables, threads of execution, procedures, functions, etc., whether referred to as software, firmware, middleware, microcode, hardware description language, or otherwise.

[0028] The technology described herein can be used in various wireless communication systems, such as CDMA, TDMA, FDMA, OFDMA, SC-FDMA, and other systems. The terms "system" and "network" are often used interchangeably. A CDMA system can implement radio technologies such as CDMA2000, Universal Terrestrial Radio Access (UTRA), and the like. CDMA2000 covers IS-2000, IS-95, and IS-856 standards. IS-2000 versions 0 and A are commonly referred to as CDMA2000 1X, 1X, and the like. IS-856 (TIA-856) is commonly referred to as CDMA2000 1xEV-DO, High Rate Packet Data (HRPD), and the like. UTRA includes Wideband CDMA (WCDMA) and other variations of CDMA. A TDMA system can implement radio technologies such as Global System for Mobile Communications (GSM). OFDMA systems can implement technologies such as Ultra Mobile Broadband (UMB), Evolved UTRA (E-UTRA), Institute of Electrical and Electronics Engineers (IEEE) 802.11 (Wi-Fi), IEEE 802.16 (WiMAX), IEEE 802.20, Flash-OFDM TMRadio technologies such as UTRA and E-UTRA are part of the Universal Mobile Telecommunications System (UMTS). 3GPP Long Term Evolution (LTE) and Advanced LTE (LTE-A) are new versions of UMTS that use E-UTRA. UTRA, E-UTRA, UMTS, LTE, LTE-A, and GSM are described in documents from an organization called the "3rd Generation Partnership Project" (3GPP). CDMA2000 and UMBS are described in documents from an organization called the "3rd Generation Partnership Project 2" (3GPP2). The techniques described herein can be used for the systems and radio technologies mentioned above as well as other systems and radio technologies (including cellular (e.g., LTE) communications on shared radio spectrum bands). However, the following description describes an LTE / LTE-A system for example purposes only, and LTE terminology is used in most of the following description, but these techniques can also be applied beyond LTE / LTE-A applications (e.g., to fifth-generation (5G) new radio (NR) networks or other next-generation communication systems).

[0029] The following description provides some examples, which are not intended to limit the scope of protection, applicability, or illustrations set forth in the claims. The functions and arrangements of the components discussed may be changed without departing from the scope of protection of the present disclosure. Various examples may omit, replace, or add various processes or components as needed. For example, the described methods may be performed in an order different from that described, and various steps may be added, omitted, or combined. In addition, features described with respect to certain examples may also be combined in other examples.

[0030] Various aspects or features will be presented in the context of systems including a plurality of devices, components, modules, etc. It should be understood and appreciated that the various systems may include additional devices, components, modules, etc. and / or may not include all of the devices, components, modules, etc. discussed in conjunction with the figures. Combinations of these methods may also be used.

[0031] Figure 11 is a diagram illustrating an example of a wireless communication system and access network 100. The wireless communication system (also referred to as a wireless wide area network (WWAN)) may include a base station 102, user equipment (UE) 104, an evolved packet core (EPC) 160, and / or a 5G core (5GC) 190. Base stations 102 may include macro cells (high-power cellular base stations) and / or small cells (low-power cellular base stations). Macro cells may include base stations. Small cells may include femto cells, pico cells, and micro cells. In one example, base stations 102 may also include gNBs 180, as further described herein. In one example, some nodes of the wireless communication system may have modems 240 and backhaul components 242 for communicating with each other over wireless or wired backhaul links 134, as described herein. While base station 102 is shown as having modems 240 and backhaul components 242, this is merely an illustrative example, and substantially any node or type of node may include modems 240 and backhaul components to provide the corresponding functionality described herein.

[0032] Base stations 102 configured for 4G LTE (which may be collectively referred to as the Evolved Universal Mobile Telecommunications System (UMTS) Terrestrial Radio Access Network (E-UTRAN)) may interface with the EPC 160 via a backhaul link 132 (e.g., using an S1 interface). Base stations 102 configured for 5G NR (which may be collectively referred to as the Next Generation RAN (NG-RAN)) may interface with the 5GC 190 via a backhaul link 184. Among other functions, the base stations 102 may perform one or more of the following: transmission 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, radio access network (RAN) sharing, multimedia broadcast multicast service (MBMS), user and device tracking, RAN information management (RIM), paging, positioning, and transmission of warning messages. The base stations 102 can communicate with each other directly or indirectly (e.g., through the EPC 160 or the 5GC 190) via a backhaul link 134 (e.g., using an X2 interface). The backhaul link 134 can be wired or wireless.

[0033] Base station 102 can communicate wirelessly with one or more UEs 104. Each of base stations 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 including small cells and macro cells can be referred to as a heterogeneous network. A heterogeneous network can also include Home evolved Node Bs (eNBs) (HeNBs), which can provide service to a restricted group called a Closed Subscriber Group (CSG). The communication link 120 between base station 102 and UE 104 can include uplink (UL) (also known as reverse link) transmissions from UE 104 to base station 102 and / or downlink (DL) (also known as forward link) transmissions from base station 102 to UE 104. The communication link 120 can use multiple-input multiple-output (MIMO) antenna technology including spatial multiplexing, beamforming, and / or transmit diversity. The communication link can be over one or more carriers. The base station 102 / UE 104 may use spectrum with up to Y MHz (e.g., 5, 10, 15, 20, 100, 400, etc. MHz) of bandwidth per carrier allocated in a carrier aggregation of up to Yx MHz (e.g., corresponding to x component carriers) for transmission in the DL and / or UL directions. These carriers may be adjacent to each other or non-adjacent to each other. The allocation of carriers may be asymmetric with respect to DL and UL (e.g., more or fewer carriers may be allocated for DL ​​compared to UL). These component carriers may include a primary component carrier and one or more secondary component carriers. The primary component carrier may be referred to as a primary cell (PCell), and the secondary component carrier may be referred to as a secondary cell (SCell).

[0034] In another example, some UEs 104 can communicate with each other using a device-to-device (D2D) communication link 158. The D2D communication link 158 can use the DL / UL WWAN spectrum. The D2D communication link 158 can 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). The D2D communication can be carried out through various wireless D2D communication systems such as FlashLinQ, WiMedia, Bluetooth, ZigBee, Wi-Fi based on IEEE 802.11 standards, LTE, or NR.

[0035] The wireless communication system may also include a Wi-Fi access point (AP) 150 that communicates with a Wi-Fi station (STA) 152 via a communication link 154 in the 5 GHz unlicensed spectrum. When communicating in the unlicensed spectrum, the STA 152 / AP 150 may perform a clear channel assessment (CCA) before communicating to determine whether the channel is available.

[0036] The small cell 102′ can operate in licensed and / or unlicensed spectrum. When operating in unlicensed spectrum, the small cell 102′ can employ NR and use the same 5 GHz unlicensed spectrum used by the Wi-Fi AP 150. The small cell 102′ employing NR in the unlicensed spectrum can improve the coverage and / or increase the capacity of the access network.

[0037] Base station 102 (whether a small cell 102′ or a large cell (e.g., a macro base station)) can include an eNB, gNodeB (gNB), or other type of base station. Some base stations, such as gNB 180, can operate in the traditional sub-6 GHz spectrum, at millimeter wave (mmW) frequencies, and / or near-mmW frequencies to communicate with UE 104. When gNB 180 operates at mmW or near-mmW frequencies, gNB 180 can be referred to as a mmW base station. Extremely high frequency (EHF) is a portion of the RF spectrum in the electromagnetic spectrum. EHF has frequencies ranging from 30 GHz to 300 GHz and wavelengths ranging from 1 mm to 10 mm. Radio waves in this band are referred to as millimeter waves. Near-mmW can extend down to frequencies of 3 GHz with a wavelength of 100 mm. The super high frequency (SHF) band is between 3 GHz and 30 GHz, also known as centimeter waves. Communications using the mmW / near-mmW radio frequency bands have extremely high path loss and a shorter communication range. The mmW base station 180 can utilize beamforming 182 with the UE 104 to compensate for the extremely high path loss and short range. The base station 102 referred to herein can include a gNB 180.

[0038] EPC 160 may include a Mobility Management Entity (MME) 162, other MMEs 164, a Serving Gateway 166, a Multimedia Broadcast Multicast Service (MBMS) Gateway 168, a Broadcast Multicast Service Center (BM-SC) 170, and a Packet Data Network (PDN) Gateway 172. MME 162 may communicate with a Home Subscriber Server (HSS) 174. MME 162 is a control node that handles signaling between UE 104 and EPC 160. Generally, MME 162 provides bearer and connection management. All user Internet Protocol (IP) packets are transmitted through Serving Gateway 166, which itself 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 may provide functionality for MBMS user service provisioning and delivery. The BM-SC 170 may serve as the entry point for content providers' MBMS transmissions, may be used to authorize and initiate MBMS bearer services within a public land mobile network (PLMN), and may be used to schedule MBMS transmissions. The MBMS gateway 168 may be used to distribute MBMS services to base stations 102 belonging to a multicast broadcast single frequency network (MBSFN) area broadcasting a specific service, and may be responsible for session management (start / stop) and collecting eMBMS-related billing information.

[0039] 5GC 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. AMF 192 may communicate with unified data management (UDM) 196. AMF 192 may be a control node that handles signaling between UE 104 and 5GC 190. Typically, AMF 192 may provide QoS flow and session management. User Internet Protocol (IP) packets (e.g., packets from one or more UEs 104) may be transmitted through UPF 195. UPF 195 may provide UE IP address allocation, as well as other functions, for one or more UEs. UPF 195 is connected to IP services 197. IP services 197 may include the Internet, an intranet, an IP multimedia subsystem (IMS), PS streaming services, and / or other IP services.

[0040] A base station may also be referred to as a gNB, a Node B, an evolved Node B (eNB), an access point, a base transceiver station, a radio base station, a radio transceiver, a transceiver function, a basic service set (BSS), an extended service set (ESS), a transmission reception point (TRP), or some other appropriate terminology. Base station 102 provides an access point to EPC 160 or 5GC 190 for UE 104. Examples of UE 104 include cellular phones, smartphones, Session Initiation Protocol (SIP) phones, laptop computers, personal digital assistants (PDAs), satellite radios, positioning systems (e.g., satellite, terrestrial), multimedia devices, video devices, digital audio players (e.g., MP3 players), cameras, game consoles, tablet devices, smart devices, robots, drones, industrial / manufacturing equipment, wearable devices (e.g., smart watches, smart clothing, smart glasses, virtual reality goggles, smart wristbands, smart jewelry (e.g., smart rings, smart bracelets)), vehicle / onboard equipment, meters (e.g., parking meters, electricity meters, gas meters, water meters, flow meters), gas pumps, large or small kitchen appliances, medical / healthcare equipment, implants, sensors / actuators, displays, or any other similarly functional device. Some UEs 104 may be referred to as IoT devices (e.g., meters, gas pumps, monitors, cameras, industrial / manufacturing equipment, appliances, vehicles, robots, drones, etc.). IoT UEs may include machine type communication (MTC) / enhanced MTC (eMTC, also known as Category (CAT)-M or Cat M1) UEs, NB-IoT (also known as CAT NB1) UEs, and other types of UEs. In the present disclosure, eMTC and NB-IoT may refer to future technologies that may evolve from or be based on these technologies. For example, eMTC may include FeMTC (further eMTC), eFeMTC (further enhanced eMTC), mMTC (massive MTC), and the like, while NB-IoT may include eNB-IoT (enhanced NB-IoT), FeNB-IoT (further enhanced NB-IoT), and the like. UE 104 may also be referred to as a station, mobile station, subscriber station, mobile unit, subscriber unit, wireless unit, remote unit, mobile device, wireless device, wireless communication device, remote device, mobile subscriber station, access terminal, mobile terminal, wireless terminal, remote terminal, handset, user agent, mobile client, client, or some other appropriate terminology.

[0041] In one example, backhaul component 242 can be configured to perform backhaul communications with one or more base stations 102 / gNB 180 using FD. In one example, backhaul component 242 can determine one or more beams to use for backhaul communications, which can include one or more transmit / receive beam pairs for each backhaul connection 134. In one example, base station 102 / gNB 180 can communicate with multiple other base stations 102 / gNB 180 over different backhaul connections 134 and can accordingly determine a transmit / receive beam pair to use for each backhaul connection 134. For example, base station 102 / gNB 180 can perform beam training or self-training with one or more other base stations 102 / gNB 180 to determine one or more beams (or one or more transmit / receive beam pairs) that should be avoided or desired, and can determine a beam to use based on the determined beams that should be avoided or desired, as further described herein.

[0042] Now go to Figure 2-5 , some aspects are described with reference to one or more components and one or more methods that can perform the actions or operations described herein, where aspects in dashed form may be optional. Figure 3 The operations described in the foregoing are presented as having a specific order and / or being performed by certain exemplary components, but it should be understood that the order of these actions and the components performing these actions may vary depending on the implementation. In addition, it should be understood that the following actions, functions, and / or described components may be performed by a specially programmed processor, a processor executing specially programmed software or computer-readable media, or any other combination of hardware components and / or software components capable of performing the described actions or functions.

[0043] See also Figure 2 , an example implementation of a base station 102 (and / or gNB 180) may include various components, some of which are described above and further described herein, including components such as one or more processors 212 and memory 216 communicating via one or more buses 244 and a transceiver 202, which may operate in conjunction with a modem 240 and / or backhaul component 242 to communicate with other base stations 102 / gNB 180 via a backhaul connection 134, determine beams for FD backhaul communications, and so on, as described herein.

[0044] In one aspect, the one or more processors 212 can include and / or be part of a modem 240 that utilizes one or more modem processors. Thus, various functions associated with the backhaul component 242 can be included in the modem 240 and / or the processor 212, and in one aspect, can be performed by a single processor, while in other aspects, different ones of these functions can be performed by a combination of two or more different processors. For example, in one aspect, the one or more processors 212 can include any one or any combination of the following: a modem processor, a baseband processor, a digital signal processor, a transmit processor, a receiver processor, or a transceiver processor associated with the transceiver 202. In other aspects, some of the features of the one or more processors 212 and / or the modem 240 associated with the backhaul component 242 can be performed by the transceiver 202.

[0045] In addition, the memory 216 can be configured to store data used herein and / or local versions of the applications 275 executed by the at least one processor 212 or one or more of the backhaul components 242 and / or its subcomponents. The memory 216 can include any type of computer-readable medium usable by a computer or the at least one processor 212, such as random access memory (RAM), read-only memory (ROM), tape, magnetic disk, optical disk, volatile memory, non-volatile memory, and any combination thereof. For example, in one aspect, when the base station 102 operates the at least one processor 212 to execute one or more of the backhaul components 242 and / or its subcomponents, the memory 216 can be a non-transitory computer-readable storage medium storing one or more computer-executable codes and / or data associated therewith for specifying one or more of the backhaul components 242 and / or its subcomponents.

[0046] The transceiver 202 may include at least one receiver 206 and at least one transmitter 208. The receiver 206 may include hardware and / or software executable by a processor to receive data, the code including instructions stored in a memory (e.g., a computer-readable medium). For example, the receiver 206 may be a radio frequency (RF) receiver. In one aspect, the receiver 206 may receive signals transmitted by at least one base station 102. In addition, the receiver 206 may process these received signals and may obtain measurements of these signals (e.g., but not limited to, Ec / Io, signal-to-noise ratio (SNR), reference signal received power (RSRP), received signal strength indicator (RSSI), etc.). The transmitter 208 may include hardware and / or software executable by a processor to transmit data, the code including instructions stored in a memory (e.g., a computer-readable medium). Suitable examples of the transmitter 208 may include, but are not limited to, an RF transmitter.

[0047] Additionally, in one aspect, the base station 102 can include an RF front end 288 that can communicate with the one or more antennas 265 and the transceiver 202 to receive and transmit radio transmissions (e.g., wireless communications transmitted by another base station or wireless transmissions transmitted by the base station 102). The RF front end 288 can be connected to the one or more antennas 265 and can include one or more low noise amplifiers (LNAs) 290, one or more switches 292, one or more power amplifiers (PAs) 298, and one or more filters 296 to transmit and receive RF signals.

[0048] In one aspect, the LNAs 290 can amplify the received signal at a desired output level. In one aspect, each LNA 290 can have specified minimum and maximum gain values. In one aspect, the RF front end 288 can use one or more switches 292 to select a particular LNA 290 and its specified gain value based on the desired gain value for a particular application.

[0049] Furthermore, for example, the RF front end 288 can utilize one or more PAs 298 to amplify the signal for RF output at a desired output power level. In one aspect, each PA 298 can have a specified minimum and maximum gain value. In one aspect, the RF front end 288 can utilize one or more switches 292 to select a particular PA 298 and its specified gain value based on the desired gain value for a particular application.

[0050] Furthermore, for example, the RF front end 288 can utilize one or more filters 296 to filter a received signal to obtain an input RF signal. Similarly, in one aspect, for example, a corresponding filter 296 can be used to filter the output from a corresponding PA 298 to produce an output signal for transmission. In one aspect, each filter 296 can be connected to a specific LNA 290 and / or PA 298. In one aspect, the RF front end 288 can utilize one or more switches 292 to select a transmit path or a receive path using a specific filter 296, LNA 290, and / or PA 298 based on a configuration as specified by the transceiver 202 and / or processor 212.

[0051] Thus, the transceiver 202 can be configured to transmit and receive wireless signals via the RF front end 288 through one or more antennas 265. In one aspect, the transceiver can be tuned to operate at a specified frequency so that the base station 102 can communicate with one or more other base stations (and / or with one or more UEs), for example, via a backhaul connection. In one aspect, the modem 240 can configure the transceiver 202 to operate at a specified frequency and power level, for example, based on the configuration of the base station 102 and the communication protocol used by the modem 240.

[0052] In one aspect, the modem 240 can be a multi-band multi-mode modem that can process digital data and communicate with the transceiver 202 so that the digital data is sent and received using the transceiver 202. In one aspect, the modem 240 can be multi-band and configured to support multiple frequency bands with a specific communication protocol. In one aspect, the modem 240 can be multi-mode and configured to support multiple operating networks and communication protocols. In one aspect, the modem 240 can control one or more components of the base station 102 (e.g., RF front end 288, transceiver 202) to enable transmission and / or reception of signals from the network based on a specified modem configuration. In one aspect, the modem configuration can be based on the mode of the modem and the frequency band in use. In another aspect, the modem configuration can be based on configuration information associated with the base station 102, such as provided by the network or other components.

[0053] In one aspect, the backhaul component 242 may optionally include: a beamforming component 252 that generates transmit beams for sending communications on the backhaul connection and / or generates receive beams for receiving communications on the backhaul connection; a list generation component 254 that generates a transmit / receive beam pair list, which may include beam pairs to be avoided in FD backhaul communications or beam pairs to be allowed in FD backhaul communications; and / or a beam determination component 256 that determines transmit beams, receive beams and / or transmit / receive beam pairs to be used for FD communications on the backhaul connection, as described herein.

[0054] In one aspect, the processor 212 may correspond to Figure 5 Similarly, the memory 216 may correspond to one or more processors in conjunction with the base station described in the embodiment of the present invention. Figure 5 The memory of the base station description in.

[0055] Figure 3 A flow chart illustrating an example of a method 300 for determining a transmit / receive beam for FD backhaul communication with another node. In one example, base station 102 may use Figure 1 and Figure 2 One or more of the components described in the method 300 may be used to perform the functions described in the method 300.

[0056] In method 300, optionally at block 302, a plurality of transmit beams and a plurality of receive beams may be determined for one or more nodes. In one aspect, beamforming component 252, for example, in conjunction with processor 212, memory 216, transceiver 202, backhaul component 242, and the like, may determine a plurality of transmit beams and a plurality of receive beams for one or more nodes. For example, the plurality of transmit beams and the plurality of receive beams may include beams used by base station 102 for self-training and / or beam determination. In another example, the plurality of transmit beams and the plurality of receive beams may additionally or alternatively include beams for other nodes with which base station 102 may communicate via backhaul connection 134. For example, the plurality of transmit beams and the plurality of receive beams may be determined based on a configuration received or otherwise stored in base station 102. In one example, base station 102 and / or other nodes may be capable of beamforming communication resources to direct energy used to transmit or receive signals in certain directions.

[0057] In method 300, optionally at block 304, for each of the plurality of receive beams, multiple transmit beams may be sent. In one aspect, beamforming component 252, for example, in conjunction with processor 212, memory 216, transceiver 202, backhaul component 242, and the like, may send multiple transmit beams for each of the plurality of receive beams. For example, for a plurality of nodes in a network capable of FD backhaul communication (referred to herein as "FD nodes" or "nodes"), the transmit portion of each FD node may use N beams and the receive portion of each FD node may use M beams. In this example, beamforming component 252 may sequentially perform beam training operations from each transmit portion while all receive portions (including the transmit base station 102 and receive portions of other nodes) receive these beams. In one example, the base station 102 may perform this process while performing self-training on the beams, and / or the transmitting portion of each FD node may repeat this process until all FD nodes have transmitted beams that are received by all receiving portions of the other FD nodes (and / or by the transmitting FD node itself) as part of full beam training performed by / for multiple nodes.

[0058] In method 300, at block 306, a signal quality of at least one receive beam is measured while transmitting via each of one or more transmit beams associated with the receive beam in full-duplex communication. In one aspect, backhaul component 242, for example, in conjunction with processor 212, memory 216, transceiver 202, etc., can measure the signal quality of at least one receive beam while transmitting via each of one or more transmit beams associated with the receive beam in full-duplex communication. For example, this can include measuring the N received transmit beams at at least one of the M receive beams and / or measuring each of the N received transmit beams at all M receive beams, as described above and further herein. The measured signal quality can be an indicator of whether to avoid using a given transmit / receive beam pair or not to avoid using the given transmit / receive beam pair in backhaul communication with another node.

[0059] Upon measuring signal quality at block 306, optionally at block 308, a list of transmit / receive beam pairs may be generated for each of the plurality of transmit beams of a given receive beam by measuring the signal quality of the given receive beam while transmitting the transmit beam in FD communication. In one aspect, list generation component 254, for example, in conjunction with processor 212, memory 216, transceiver 202, backhaul component 242, etc., may generate a list of transmit / receive beam pairs for each of the plurality of transmit beams of a given receive beam by measuring the signal quality of the given receive beam while transmitting the transmit beam in FD communication. For example, certain transmit / receive beam pairs may cause interference at base station 102 due to clutter. For example, clutter may include objects in the signal path that may cause the signal to reflect, be blocked, or otherwise exhibit undesirable behavior. Potential negative impacts may be measured by receiving signals at base station 102 and determining whether clutter may cause the transmit beam to clutter, resulting in excessive energy being received using a particular receive beam (e.g., the measured energy being at least a threshold energy level). If so, the list generation component 254 can add these beam pairs to the list as beam pairs to be avoided, and these beam pairs can be avoided, as further described herein. In other examples, the list can include beam pairs that exhibit interference, which can include self-interference, are below a threshold (and therefore should not be avoided), and these beam pairs can be added to the list and attempted for use, as further described herein.

[0060] For example, list generation component 254 can generate a list to include: a measurement of interference experienced by a beam pair (e.g., SINR at a receive beam, measured in decibels), a classification of interference (e.g., low or high), an indication that the beam pair is to be avoided (or its presence in the list can indicate that the beam pair is to be avoided), etc. In this regard, for example, beam determination component 256 can determine the beam pair to be avoided (or used), as further described herein. Figure 4 An example list (described below) could be as follows:

[0061] <![CDATA[ Beam Pair Index ]]> <![CDATA[ Interference at the Rx part of the node ]]> Beam 1 at the Tx part, Beam 1 at the Rx part high Beam 2 at the Tx part, Beam 3 at the Rx part high Beam 5 at the Tx part, Beam 4 at the Rx part high … … A beam pair Low A beam pair Low

[0062] In this example, beam pairs indicated as exhibiting low interference may be used or attempted to be used to communicate with a given node.

[0063] Figure 4 An example of a node transmitting and receiving with noise is shown. Figure 4As shown in FIG, node 400 has a transmit chain 402 and a receive chain 404. Transmit chain 402 can perform beamforming in various directions to create transmit beams 406 numbered 1-7. Receive chain 404 can perform beamforming in various directions to create receive beams 408 numbered 1-6. Each transmit beam can have an associated line-of-sight (LOS) path (as shown for transmit beam 4) and a reflected path for the receive beam (as shown for receive beam 4). As described above, node 400 can send each transmit beam 406 for each receive beam 408 in beam training. Due to clutter (e.g., clutter 1 410, clutter 2 412, clutter 3 414), some transmit beams may become part of the reflected path of the receive beam. As described above, clutter can include essentially any object that redirects the signal energy of a transmit beam in the LOS path, such as a building or structure (e.g., another base station), a car, a tree, etc. Figure 4 In FIG. 4 , clutter 1 410 may cause transmit beam 1 to interfere with or reflect onto receive beam 1; clutter 2 412 may cause transmit beam 2 to interfere with or reflect onto receive beam 3; and clutter 3 414 may cause transmit beam 5 to interfere with or reflect onto receive beam 4. As described herein, interference may be detected by measuring signal energy, quality, or interference (e.g., SINR, SNR, etc.) at a receive beam, where the signal energy, quality, or interference may include a measure of self-interference caused at at least one receive beam by a corresponding transmit beam from one or more transmit beams. The measure of self-interference may correspond to the measured signal energy, quality, or interference, as a metric that may be measured (e.g., relative to a threshold) to determine whether self-interference prohibits communication using the beam pair. The measure of signal energy or interference may reflect the amount of self-interference caused at the receive beam. Beam pairs determined to be undesirable (e.g., exhibiting signal energy exceeding a threshold and therefore to be avoided) can be added to the list to be avoided for FD communications (or other beam pairs that are not to be avoided can be added to the list, depending on the list functionality), as shown in the list example above, which shows higher Rx interference in the first beam pair (Beam 1 of the Tx part, Beam 1 of the Rx part), the second beam pair (Beam 2 of the Tx part, Beam 3 of the Rx part), and the third beam pair (Beam 5 of the Tx part, Beam 4 of the Rx part).

[0064] In another example, each FD node can determine the relative interference level (in decibels (dB)) seen by the receiver portion due to the transmission of the transmitter portion of each beam pair. When different FD nodes perform beam training, node 400 can also determine the beam index for receiving signals from different FD nodes, which can be performed independently of the beam training described above. For example, node 400 can include another list of beam pairs for establishing links with other nodes, where these beam pairs can be determined during beam training. For example, the list can include the following:

[0065] <![CDATA[ FD node with which the link is established ]]> <![CDATA[ The beam pair used at node 400 ]]> Node 400←→Node 3 Beam 6 at the Tx part, Beam 2 at the Rx part Node 400←→Node 7 Beam 4 at the Tx part, beam 1 at the Rx part … … Node 400←→Node 2 Beam 5 at the Tx part, Beam 4 at the Rx part

[0066] However, the beam pair determined or selected for use with another node may conflict with the list of beam pairs to be avoided (e.g., beam 5 for the Tx portion, beam 4 for the Rx portion of communication with node 2). Figure 4 The beam codebook is shown, where N=7 beams are used for the transmitter (Tx) part and M=6 beams are used for the receiver (Rx) part. Figure 4 In this example, the receiver portion of node 400 exhibits high interference due to transmissions from the transmit portion of node 400 having the following beam pairs: beam 1 of the Tx portion, beam 1 of the Rx portion corresponding to clutter 1 410, beam 2 of the Tx portion, beam 3 of the Rx portion corresponding to clutter 2 412, and beam 5 of the Tx portion, beam 4 of the Rx portion corresponding to clutter 3 414. If node 400 uses beam index 4 as the Rx beam for receiving communications from different nodes, and uses beam index 5 as the TX beam for sending communications to different nodes, high interference cannot be avoided at the Rx portion of node 400.

[0067] Return Reference Figure 3In method 300, at block 310, a transmit / receive beam pair to be used in full-duplex communication with one or more other nodes may be determined based at least in part on the measured signal qualities associated with each of the one or more transmit beams and the at least one receive beam. In one aspect, beam determination component 256, for example, in conjunction with processor 212, memory 216, transceiver 202, backhaul component 242, etc., may determine a transmit / receive beam pair to be used in full-duplex communication with one or more other nodes based at least in part on the measured signal qualities associated with each of the one or more transmit beams and the at least one receive beam. In one example, beam determination component 256 may determine the transmit / receive beam pair based at least in part on the list generated at block 308, as further described herein. For example, the beam determination component 256 can determine beam pairs for sending and receiving communications to and from a given node, but can avoid beam pairs determined to have signal quality below a threshold (e.g., beam pairs indicated in a list, wherein the list includes undesired beam pairs that should be avoided due to self-interference). In another example, the beam determination component 256 can determine the beam pair to be used, request a beam pair from another node, request a new beam pair (wherein the beam pair to be avoided is assigned by another node), use zero shaping for the transmit beam (wherein the beam pair to be avoided is assigned by another node), and the like, as described herein.

[0068] In one example, when determining the transmit / receive beam pair at block 310, the transmit / receive beam pair can optionally be indicated as not to be avoided based on a list at block 312. In one aspect, the beam determination component 256, for example, in conjunction with the processor 212, the memory 216, the transceiver 202, the backhaul component 242, etc., can indicate the transmit / receive beam pair as not to be avoided (or allowed or otherwise required) based on the list. For example, the beam determination component 256 can determine that the transmit / receive beam pair is in the list (where the list includes allowed beam pairs (e.g., and does not include disallowed beam pairs)), can determine that the transmit / receive beam pair is not in the list (where the list includes disallowed beam pairs (or beam pairs to be avoided and does not include allowed beam pairs)), can determine that the beam pair is associated with low interference (e.g., high SINR) indicated in the list, can determine that the beam pair is not associated with high interference (e.g., low SINR) indicated in the list, and so on, as described above.

[0069] In another example, when determining the transmit / receive beam pair at block 310, optionally at block 314, an indication of a transmit / receive beam pair to be used can be received and the transmit beam can be replaced with a zero-shaped beam. In one aspect, the beam determination component 256, for example, in conjunction with the processor 212, the memory 216, the transceiver 202, the backhaul component 242, etc., can receive an indication of a transmit / receive beam pair to be used and can replace the transmit beam with a zero-shaped beam. For example, the beam determination component 256 can receive an indication as a configured transmit / receive beam pair that is configured for use by another node (e.g., a node with which FD communication is performed). For example, the other node can determine the desired beam pair based on performing beam training and can indicate the transmit / receive beam pair as the configured transmit / receive beam pair to be used based on the beam training, based on a signal received from the base station 102, based on a known location of the base station 102, etc. In this example, the beam determination component 256 can determine that the transmit / receive beam pair indicated by another node is in the list of beam pairs to avoid (or is not in the list of beam pairs to use, or has higher associated interference). In this case, for example, the beam determination component 256 can determine to replace the transmit beam in the indicated transmit / receive beam pair with a null-shaped beam, wherein the null-shaped beam can null the energy in the direction of the receive beam. For example, this can be an autonomous method to mitigate interference from clutter, wherein in this case, the indicated beam from another node is replaced with a null-shaped beam, which steers energy in the indicated direction and nulls the energy in the self-interference direction of the base station 102. For example, if a different node (e.g., node 2 in the above example) requests beam 5 of base station 102 (e.g., node 400 in the above example) for Tx, the base station (e.g., node 400) may reject the beam index or replace beam 5 of the transmit portion with a null-shaped beam that steers energy in the direction of beam 5 for transmission and nulls the direction of beam 4 used for the receive portion. This may cause the other node to use a different beam than beam 5 and / or detect and use beam 4 as its receive beam (or otherwise determine that base station 102 is using beam 4 as a transmit beam).

[0070] In another example, when determining the transmit / receive beam pair at block 310, optionally at block 316, an indication of a different transmit / receive beam pair to use can be received, and based on the list, a new transmit / receive beam pair can be requested, or the transmit / receive beam pair can be instructed to be used. In one aspect, the beam determination component 256, for example, in conjunction with the processor 212, the memory 216, the transceiver 202, the backhaul component 242, etc., can receive an indication of a different transmit / receive beam pair to use, and based on the list, a new transmit / receive beam pair can be requested, or the transmit / receive beam pair can be instructed to be used (e.g., the beam pair determined at block 310). For example, as described above, different nodes can indicate that use of a beam pair is not allowed or to be avoided based on the generated list. In this case, the beam determination component 256 can determine to request a new transmit / receive beam pair from the different nodes to avoid using the beam pair indicated by the received indication. In another example, the beam determination component 256 can indicate to different nodes a transmit / receive beam pair to use, where the transmit / receive beam pair can be a beam pair (or one of multiple beam pairs) determined in box 310 (e.g., not in the list when the list includes a beam pair to be avoided, in the list when the list includes a beam pair to be used, has low interference indicated in the list, etc., as described above).

[0071] For example, this can be a collaborative or interactive approach performed with different nodes. In one example, this approach can be used generally, or can be used instead of (or in addition to) using the null-shaped beams described above. In one example, the beam determination component 256 can request or indicate a transmit / receive beam pair where null-shaped beam weights may not be possible for a particular choice of desired signal direction and null direction (e.g., for large array sizes, phase shifter and antenna gain control (AGC) quantization limitations, calibration errors, proximity of desired and null directions, circuit-level architecture, etc.). In these scenarios, the beam determination component 256 can reject the request from the different node and can seek a better beam index selection for transmission and / or reception from the different node, as described above.

[0072] In another example, in method 300, optionally at block 318, at least a portion of the information from the list can be indicated to different nodes. In one aspect, beam determination component 256, e.g., in conjunction with processor 212, memory 216, transceiver 202, backhaul component 242, etc., can indicate at least a portion of the information from the list to different nodes (e.g., via a backhaul link). For example, beam determination component 256 can indicate a portion of the information from the list, which can include a list of beam pairs to be used with base station 102 (or to be avoided in communicating with base station 102).

[0073] In this example, when determining the transmit / receive beam pair at block 310, an indication to use the transmit / receive beam pair can optionally be received at block 320 based at least in part on at least a portion of the information indicating a list. In one aspect, beam determination component 256, for example, in conjunction with processor 212, memory 216, transceiver 202, backhaul component 242, etc., can receive the indication to use the transmit / receive beam pair based at least in part on at least a portion of the information indicating a list. In this aspect, a different node can configure beam pairs for base station 102 based on receiving the information, such that the beams determined to be unavoidable can be used for communication with base station 102. In one example, a different node can be configured similarly to base station 102 and, therefore, can also determine a transmit / beam pair for base station 102 to avoid interference with itself.

[0074] Thus, for example, in method 300, optionally at block 322, information regarding transmit / receive beam pairs to be used or not to be used can be received from different nodes. In one aspect, beam determination component 256, e.g., in conjunction with processor 212, memory 216, transceiver 202, backhaul component 242, etc., can receive information regarding transmit / receive beam pairs to be used or not to be used from different nodes. For example, beam determination component 256 can determine transmit / receive beam pairs to be used based on information received from different nodes (e.g., to avoid beam pairs indicated in information from different nodes to avoid, to use beam pairs indicated in information from different nodes to use), and also based on information from the list generated at block 306, as described above.

[0075] This example may also be a collaborative / interactive approach between base station 102 and different nodes. For example, base station 102 may perform bidirectional beam training to train (or train together with) different nodes (e.g., in the example described above, node 400 may train node 2), where the training may include training the base station 102's Tx path and the different nodes' Tx paths. The different nodes may determine the optimal or acceptable beam pairs on the Rx path and may transmit information regarding the beam pairs to the base station 102 Tx path. Base station 102 may determine the optimal or acceptable beam pairs on the Rx path and transmit this information to the different nodes' Tx paths. However, as previously described, the beam pairs for the two links may not be consistent, and / or certain choices of beam pairs for one link may degrade the performance of the other link due to self-interference. It is also possible to perform beam pair adaptation on both links through an iterative approach. In this example, as described with reference to block 318, base station 102 may transmit additional information to the different nodes, which may include instructions or information to capture the clutter around them (e.g., the direction and interference level caused by different clutter). Different nodes can compare this information with their own lists to identify beam pairs that are determined to be unavoidable for both nodes. Since two nodes can have similar capabilities (e.g., FD in an integrated access and backhaul (IAB) configuration), both nodes can act as a "master node" and forward the appropriate information to the other node.

[0076] In another example, in method 300, optionally at block 324, beam training can be performed based on a list. In one aspect, beamforming component 252, for example, in conjunction with processor 212, memory 216, transceiver 202, backhaul component 242, etc., can perform beam training based on a list. In this example, blocks 302, 304, 306, and 310 can be performed in self-training to determine beam pairs to avoid or use, as described above, and then beam training can be performed based on the list. In this aspect, beam training component 252 can optimize beam training by avoiding transmitting transmit beams in the list, for example, at least for receive beam opportunities in which the receive beam is part of a transmit / receive beam pair. For example, during beam training, the Tx portion and the Rx portion of each node can perform self-training separately (e.g., via periodic, dedicated resources allocated for self-training), without performing beam training for (or with) other FD nodes. In the case where the Tx and Rx parts of the base station 102 are geographically co-located at the base node, self-training can be done with low power (and therefore with more tolerable interference coverage) and on symbols where the base station 102 is not active / will not be sending / receiving data. After the base station 102 identifies the allowed and disallowed beam sets, the beamforming component 252 can prune its beam codebook for the disallowed beams for subsequent beam training for other FD nodes.

[0077] In another example, in method 300, optionally at block 326, the ability to generate a null-shaped beam in one or more beam directions can be indicated to different nodes. In one aspect, beam determination component 256, for example, in conjunction with processor 212, memory 216, transceiver 202, backhaul component 242, etc., can indicate to different nodes the ability to generate a null-shaped beam in one or more beam directions. In this example, determining transmit / receive beam pairs at block 310 can include receiving, from different nodes, indications of beam pairs to use based on the ability to generate null-shaped beams. In this example, different nodes can select beam pairs based on the ability indicated by base station 102 to null beams in certain directions and / or can instruct base station 102 to null beams in certain directions. For example, beam determination component 256 can indicate to different nodes the ability to generate a null-shaped beam in one or more directions, or the ability to generate beams with specified null characteristics in one or more directions relative to directions with good signal energy, and the different nodes can configure base station 102 to generate null-shaped beams accordingly.

[0078] Figure 5is a block diagram of a MIMO communication system 500 including a base station 102-a and a base station 102-b, which may communicate via a wireless backhaul, in accordance with various aspects of the present disclosure. The MIMO communication system 500 may depict a system with reference to Figure 1 Aspects of the wireless communication access network 100 are described. The base stations 102-a, 102-b may be reference Figure 1 Examples of various aspects of base station 102 are described. Base station 102-a can be equipped with antennas 534 and 535, and base station 102-b can be equipped with antennas 552 and 553. In MIMO communication system 500, base station 102-a can simultaneously transmit data over multiple communication links. Each communication link can be referred to as a "layer," and the "rank" of a communication link can indicate the number of layers used for communication. For example, in a 2x2 MIMO communication system (in which base station 102-a transmits two "layers"), the rank of the backhaul link between base station 102-a and base station 102-b is two.

[0079] At base station 102-a, a transmit (Tx) processor 520 may receive data from a data source. The transmit processor 520 may process the data. The transmit processor 520 may also generate control symbols or reference symbols. The transmit MIMO processor 530 may perform spatial processing (e.g., precoding) on ​​the data symbols, control symbols, or reference symbols (if any), and provide output symbol streams to transmit modulators / demodulators 532 and 533. Each modulator / demodulator 532 to 533 may process its own output symbol stream (e.g., for OFDM, etc.) to obtain an output sample stream. Each modulator / demodulator 532 to 533 may further process (e.g., convert to an analog signal, amplify, filter, and upconvert) the output sample stream to obtain a DL signal. In one example, the DL signals from the modulators / demodulators 532 and 533 may be transmitted via antennas 534 and 535, respectively.

[0080] Base station 102-b may be a reference Figure 1-2Examples of various aspects of base station 102 (or other upstream node) are described. At base station 102-b, antennas 552 and 553 can receive DL signals from base station 102-a and can provide received signals to modulators / demodulators 554 and 555, respectively. Each modulator / demodulator 554 to 555 can condition (e.g., filter, amplify, downconvert, and digitize) its respective received signal to obtain input samples. Each modulator / demodulator 554 to 555 can further process the input samples (e.g., for OFDM, etc.) to obtain received symbols. A MIMO detector 556 can obtain received symbols from modulators / demodulators 554 and 555, perform MIMO detection on the received symbols (if applicable), and provide detected symbols. A receive (Rx) processor 558 can process (e.g., demodulate, deinterleave, and decode) the detected symbols, provide decoded data for UE 104 to a data output, and provide decoded control information to a processor 580 or memory 582.

[0081] In some cases, processor 580 may execute stored instructions to instantiate backhaul component 242 (e.g., see Figure 1 and Figure 2 ).

[0082] On the uplink (UL), at base station 102-b, a transmit processor 564 may receive and process data from a data source. The transmit processor 564 may also generate reference symbols for a reference signal. The symbols from transmit processor 564 may be precoded (if applicable) by transmit MIMO processor 566, further processed (e.g., for SC-FDM, etc.) by modulators / demodulators 554 and 555, and transmitted back to base station 102-a based on communication parameters received from base station 102-a. At base station 102-a, the UL signal from base station 102-b may be received by antennas 534 and 535, processed by modulators / demodulators 532 and 533, detected by MIMO detector 536 (if applicable), and further processed by receive processor 538. Receive processor 538 may provide decoded data to a data output and to processor 540 or memory 542.

[0083] In some cases, processor 540 may execute stored instructions to instantiate backhaul component 242 (e.g., see Figure 1 and Figure 3 ).

[0084] The components of base station 102-b may be implemented individually or collectively using one or more application-specific integrated circuits (ASICs), wherein the one or more ASICs are adapted to perform some or all of the applicable functions in hardware. Each of the stated modules may be a means for performing one or more functions related to the operation of MIMO communication system 500. Similarly, the components of base station 102 may be implemented individually or collectively using one or more ASICs, wherein the one or more ASICs are adapted to perform some or all of the applicable functions in hardware. Each of the stated components may be a means for performing one or more functions related to the operation of MIMO communication system 500.

[0085] In addition, base station 102-a and / or base station 102-b can communicate with downstream nodes using similar mechanisms as described for base station 102-a and base station 102-b, respectively, where the downstream nodes may include one or more UEs 104 or other base stations (e.g., where the downstream nodes can use the components and functions described above with respect to base station 102-b, and base station 102-a or base station 102-b as the upstream node can use the components and functions described above with respect to base station 102-a).

[0086] The specific embodiments described above in conjunction with the accompanying drawings describe some examples, but they do not represent all examples that can be implemented, nor do they represent all examples that fall within the scope of protection of the claims. As used in this specification, the word "exemplary" means "used as an example, illustration, or description", but does not mean "more preferred" or "more advantageous" than other examples. The specific embodiments include specific details to provide a thorough understanding of the described technology. However, these technologies can be implemented without using these specific details. In some instances, in order to avoid obscuring the concepts of the described examples, well-known structures and devices are shown in block diagram form.

[0087] Information and signals may be represented using any of a variety of different techniques and methods. For example, data, instructions, commands, information, signals, bits, symbols, and chips mentioned throughout the above description may be represented by voltages, currents, electromagnetic waves, magnetic fields or particles, optical fields or particles, computer-executable code or instructions stored on a computer-readable medium, or any combination thereof.

[0088] The various exemplary blocks and components described in conjunction with the disclosure herein may be implemented or executed using a specially programmed device, such as, but not limited to, a digital signal processor (DSP), an ASIC, a field programmable gate array (FPGA) or other programmable logic device, discrete gate or transistor logic devices, discrete hardware components, or any combination thereof, for performing the functions described herein. A specially programmed processor may be a microprocessor, or the processor may be any conventional processor, controller, microcontroller, or state machine. A specially programmed processor may also be implemented as a combination of computing devices (e.g., a combination of a DSP and a microprocessor, a plurality of microprocessors, a combination of one or more microprocessors and a DSP core, or any other such configuration).

[0089] The functions described herein may be implemented using hardware, software executed by a processor, firmware, or any combination thereof. When implemented using software executed by a processor, the functions may be stored on a non-transitory computer-readable medium or transmitted as one or more instructions or codes on a non-transitory computer-readable medium. Other examples and implementations also fall within the scope and spirit of the present disclosure and the claims appended thereto. For example, due to the nature of software, the functions described above may be implemented using software executed by a specially programmed processor, hardware, hardware wiring, or any combination thereof. Features used to implement the functions may be physically distributed across multiple locations, including being distributed across different physical locations to implement a portion of the functions. In addition, the term "or" is intended to mean an inclusive "or" rather than an exclusive "or." That is, unless otherwise specified or clear from the context, phrases such as "X employs A or B" are intended to mean any naturally inclusive permutation. That is, for example, the phrase "X employs A or B" satisfies any of the following: X employs A; X employs B; or X employs A and B. Furthermore, as used herein (including the claims), “or” as used in a list item prefixed by “at least one of” indicates a separate list, so that, for example, the list “at least one of A, B, or C” means: A or B or C or AB or AC or BC or ABC (A and B and C).

[0090] Computer-readable media include computer storage media and communication media, wherein the communication media include any medium that is convenient for transmitting a computer program from one place to another. Storage media can be any available medium that a general or special-purpose computer can access. For example, but not limited to, computer-readable media can include RAM, ROM, EEPROM, CD-ROM or other optical disk storage, disk storage or other magnetic storage device, or any other medium that can be used to carry or store the desired program code unit with instruction or data structure form and can be accessed by a general or special-purpose computer or a general or special-purpose processor. In addition, any connection can be appropriately referred to as a computer-readable medium. For example, if software is transmitted from a website, server or other remote source using a coaxial cable, optical fiber cable, twisted pair, digital subscriber line (DSL) or wireless technologies such as infrared, wireless and microwave, then the coaxial cable, optical fiber cable, twisted pair, DSL or wireless technologies such as infrared, wireless and microwave are included in the definition of the medium. As used herein, disk and disc include compact disc (CD), laser disc, optical disc, digital versatile disc (DVD), floppy disk and Blu-ray disc, where disks usually reproduce data magnetically, while discs reproduce data optically with lasers. Combinations of the above should also be included within the scope of protection of computer-readable media.

[0091] To enable any person of ordinary skill in the art to implement or use the present disclosure, the above description is centered around the present disclosure. It is obvious to those of ordinary skill in the art that various modifications to the present disclosure are possible, and the general principles defined herein may also be applied to other variations without departing from the spirit or scope of the present disclosure. In addition, although the elements of the described aspects and / or embodiments are described or claimed in the singular, the plural form is contemplated unless expressly stated to be limited to the singular. In addition, unless otherwise stated, all parts or a portion of any aspect and / or embodiment may be used together with all parts or a portion of any other aspect and / or embodiment. Therefore, the present disclosure is not limited to the examples and design schemes described herein, but is consistent with the widest range of the principles and novel features disclosed herein.

[0092] The following aspects are merely illustrative, and aspects thereof may be combined with other embodiments or aspects of the teachings described herein without limitation.

[0093] Aspect 1 is a method for wireless communication of a node, the method comprising: measuring a signal quality of at least one receive beam when transmitting through each of one or more transmit beams associated with at least one receive beam in full-duplex communication; and determining a transmit / receive beam pair to be used in full-duplex communication with one or more other nodes based at least in part on the measured signal qualities associated with each of the one or more transmit beams and the at least one receive beam.

[0094] In aspect 2, the method according to aspect 1 includes determining, for the node, a plurality of transmit beams including the one or more transmit beams, and a plurality of receive beams including the at least one receive beam.

[0095] In aspect 3, the method according to aspect 2 includes, for each of the plurality of receive beams, transmitting the plurality of transmit beams.

[0096] In aspect 4, the method according to aspect 3 includes: wherein measuring the signal quality is part of generating a list of transmit / receive beam pairs, for each of the plurality of transmit beams and for a given receive beam, measuring the signal quality of the given receive beam when the transmit beam is transmitted in full-duplex communication, and wherein determining the transmit / receive beam pair to be used is based at least in part on the list.

[0097] In aspect 5, the method according to aspect 4 includes: wherein, generating the transmit / receive beam pair list includes: for each given transmit / receive beam pair, based on comparing the signal quality with a threshold, indicating through the list whether to avoid the given transmit / receive beam pair or not to avoid the given transmit / receive beam pair.

[0098] In aspect 6, the method of aspect 5 includes wherein determining the transmit / receive beam pair to use is based on determining not to avoid the transmit / receive beam pair.

[0099] In aspect 7, the method according to any one of aspects 1 to 6 includes: wherein the signal quality includes at least one of a signal-to-noise ratio (SNR) or a signal-to-interference-plus-noise ratio (SINR).

[0100] In aspect 8, the method according to any one of aspects 1 to 7 includes: wherein the measured signal quality includes a measure of self-interference caused by a corresponding transmit beam of the one or more transmit beams at the at least one receive beam.

[0101] In aspect 9, the method according to any one of aspects 1 to 8 includes: receiving an indication of a configured transmit / receive beam pair for communicating with the one or more other nodes from a different node among the one or more other nodes, wherein determining the transmit / receive beam pair to be used includes: based on the signal quality, replacing at least the transmit beam of the configured transmit / receive beam pair with a zero-shaped beam, wherein the zero-shaped beam directs energy away from at least the receive beam of the configured transmit / receive beam pair.

[0102] In aspect 10, the method according to any one of aspects 1 to 9 includes: receiving an indication of a different transmit / receive beam pair for communicating with the one or more other nodes from a different node among the one or more other nodes, and based on the measured signal quality associated with the different transmit / receive beam pair, indicating to the different node of the one or more other nodes not to use the different transmit / receive beam pair.

[0103] In aspect 11, the method according to aspect 10 includes: wherein, indicating not to use the different transmit / receive beam pair includes at least one of: requesting a new transmit / receive beam pair, or indicating to use the transmit / receive beam pair determined at least in part based on a transmit / receive beam pair list.

[0104] In aspect 12, the method according to any one of aspects 1 to 11 includes: indicating at least a portion of the information from the transmit / receive beam pair list to a different node of the one or more other nodes, which includes an indication of whether to avoid or not avoid each of the transmit / receive beam pairs, and receiving an indication of the transmit / receive beam pair to be used in communication with the one or more other nodes from the different node based at least on the portion of the information.

[0105] In aspect 13, the method according to any one of aspects 1 to 12 includes: receiving information from a different node among the one or more other nodes about a transmit / receive beam pair to be avoided or not avoided at the different node, wherein determining the transmit / receive beam pair to be used is additionally based on the information, and sending an indication to the different node to use the transmit / receive beam pair in communicating with the node.

[0106] In aspect 14, the method according to any one of aspects 1 to 13 includes: performing beam training with the one or more other nodes based on a portion of the transmit / receive beam pairs selected from the transmit / receive beam pair list, which includes an indication of whether each of the transmit / receive beam pairs is to be avoided or not avoided, wherein determining the transmit / receive beam pair to be used is based on a result of the beam training.

[0107] In aspect 15, the method according to any one of aspects 1 to 14 includes: indicating to different nodes among the one or more other nodes the ability to generate zero-shaped beams in one or more directions, or to generate beams with specified zero characteristics in one or more directions relative to the direction with the desired signal energy, and based on the capability, receiving from the different nodes an indication to communicate with the one or more other nodes using the transmit / receive beam pair.

[0108] Aspect 16 is an apparatus for wireless communication, comprising a transceiver, a memory configured to store instructions, and one or more processors communicatively coupled to the transceiver and the memory, wherein the one or more processors are configured to execute the instructions to perform the operations of one or more methods according to any one of Aspects 1 to 15.

[0109] Aspect 17 is an apparatus for wireless communication, the apparatus comprising means for performing the operations of one or more methods according to any one of aspects 1 to 15.

[0110] Aspect 18 is a computer-readable medium comprising code executable by one or more processors to perform the operations of one or more methods according to any one of aspects 1 to 15.

Claims

1. A method for wireless communication of a node, the method comprising: receiving an indication of a configured transmit / receive beam pair to be used by the node for full-duplex communication with one or more other nodes; measuring a signal quality of at least one receive beam while transmitting through each of the one or more transmit beams associated with the at least one receive beam in full-duplex communication; as well as and determining a transmit / receive beam pair to be used by the node for the full-duplex communication with the one or more other nodes based at least in part on a measured signal quality of the at least one receive beam, wherein determining the transmit / receive beam pair to be used by the node comprises replacing a transmit beam in the configured transmit / receive beam pair with a null-shaped beam that directs energy away from the receive beam in the configured transmit / receive beam pair based on the measured signal quality.

2. The method according to claim 1, further comprising: A plurality of transmit beams including the one or more transmit beams and a plurality of receive beams including the at least one receive beam are determined for the node.

3. The method according to claim 2, further comprising: For each of the plurality of receive beams, the plurality of transmit beams are transmitted.

4. The method according to claim 1, wherein Replacing the transmit beam in the configured transmit / receive beam pair is performed upon determining that the configured transmit / receive beam pair is to be avoided.

5. The method according to claim 1, wherein The energy is directed in the direction of the transmit beam in the configured transmit / receive beam pair.

6. The method according to claim 3, wherein: Measuring the signal quality includes: for each transmit beam of the plurality of transmit beams and for a given receive beam, measuring the signal quality at the given receive beam when the transmit beam is transmitted in full-duplex communication, and the method further includes: generating a list of transmit / receive beam pairs based on the signal quality of each transmit beam and the given receive beam, wherein the configured transmit / receive beam pairs determined to be avoided are determined to be avoided based at least in part on the list.

7. The method according to claim 6, wherein: Generating the transmit / receive beam pair list includes, for each given transmit / receive beam pair, indicating by the list whether the given transmit / receive beam pair is to be avoided or not to be avoided based on comparing the signal quality with a threshold.

8. The method according to claim 7, wherein: Determining the transmit / receive beam pair to use is based on determining that the transmit / receive beam pair is not to be avoided.

9. The method according to claim 1, wherein: The signal quality includes at least one of a signal-to-noise ratio (SNR) or a signal-to-interference-plus-noise ratio (SINR).

10. The method according to claim 1, wherein The signal quality includes a measure of self-interference caused at the at least one receive beam by a corresponding transmit beam of the one or more transmit beams.

11. The method according to claim 1 , further comprising: receiving, from different ones of the one or more other nodes, indications of different transmit / receive beam pairs to be used for communicating with the one or more other nodes; as well as Based on the measured signal quality associated with the different transmit / receive beam pair, indicating to the different node of the one or more other nodes that the different transmit / receive beam pair is not to be used.

12. The method according to claim 11, wherein Indicating that the different transmit / receive beam pair is not to be used includes at least one of requesting a new transmit / receive beam pair or indicating that the transmit / receive beam pair determined at least in part based on a transmit / receive beam pair list is to be used.

13. The method according to claim 1, further comprising: indicating at least a portion of information from a transmit / receive beam pair list to a different one of the one or more other nodes, the transmit / receive beam pair list including an indication of whether each of the transmit / receive beam pairs is to be avoided or not to be avoided; as well as Based on at least a portion of the information, an indication is received from the different node to use a new transmit / receive beam pair in communicating with the one or more other nodes.

14. The method according to claim 1, further comprising: receiving, from a different node of the one or more other nodes, information regarding transmit / receive beam pairs to be avoided or not avoided at the different node, wherein determining the transmit / receive beam pairs to be used by the node is additionally based on the information; and An indication is sent to the different node to use the determined transmit / receive beam pair in communicating with the node.

15. The method according to claim 1, further comprising: indicating to different ones of the one or more other nodes an ability to generate null-shaped beams in one or more directions, or to generate beams having specified null characteristics in one or more directions relative to a direction having desired signal energy; as well as Based on the capabilities, an indication is received from the different node to use the transmit / receive beam pair in communicating with the one or more other nodes.

16. The method according to claim 1, wherein The node or the one or more other nodes include at least one of an integrated access and backhaul (IAB) node, a user equipment (UE), a customer premises equipment (CPE), an access point, a relay node, or a repeater.

17. An apparatus for wireless communication, comprising: transceiver; a memory configured to store instructions; as well as one or more processors communicatively coupled to the transceiver and the memory, wherein the one or more processors are configured to: receiving an indication of a configured transmit / receive beam pair to be used by the node for full-duplex communication with one or more other nodes; measuring a signal quality of at least one receive beam while transmitting through each of the one or more transmit beams associated with the at least one receive beam in full-duplex communication; and and determining a transmit / receive beam pair to be used by the node for the full-duplex communication with the one or more other nodes based at least in part on a measured signal quality of the at least one receive beam, wherein determining the transmit / receive beam pair to be used by the node comprises replacing a transmit beam in the configured transmit / receive beam pair with a null-shaped beam that directs energy away from the receive beam in the configured transmit / receive beam pair based on the measured signal quality.

18. The device according to claim 17, wherein The one or more processors are further configured to determine, for the node, a plurality of transmit beams comprising the one or more transmit beams and a plurality of receive beams comprising the at least one receive beam.

19. The device according to claim 18, wherein The one or more processors are further configured to, for each of the plurality of receive beams, transmit the plurality of transmit beams.

20. The apparatus according to claim 17, wherein Replacing the transmit beam in the configured transmit / receive beam pair is performed upon determining that the configured transmit / receive beam pair is to be avoided.

21. The apparatus according to claim 17, wherein The energy is directed in the direction of the transmit beam in the configured transmit / receive beam pair.

22. The apparatus according to claim 19, wherein The one or more processors are configured to measure the signal quality by: for each transmit beam of the plurality of transmit beams and for a given receive beam, measuring the signal quality at the given receive beam when the transmit beam is transmitted in full-duplex communication, and wherein the one or more processors are further configured to: generate a list of transmit / receive beam pairs based on the signal quality of each transmit beam and the given receive beam, wherein the one or more processors are configured to: configure the transmit / receive beam pairs determined to be avoided based at least in part on the list.

23. The device according to claim 22, wherein The one or more processors are configured to generate the transmit / receive beam pair list by: for each given transmit / receive beam pair, indicating by the list whether the given transmit / receive beam pair will be avoided or will not be avoided based on comparing the signal quality with a threshold.

24. The device according to claim 23, wherein The one or more processors are configured to determine the transmit / receive beam pair to be used by the apparatus based on determining that the transmit / receive beam pair is not to be avoided.

25. The apparatus according to claim 17, wherein The signal quality includes at least one of a signal-to-noise ratio (SNR) or a signal-to-interference-plus-noise ratio (SINR).

26. The apparatus according to claim 17, wherein The signal quality includes a measure of self-interference caused at the at least one receive beam by a corresponding transmit beam of the one or more transmit beams.

27. The apparatus according to claim 17, wherein The one or more processors are further configured to: receiving, from different ones of the one or more other nodes, indications of different transmit / receive beam pairs to be used for communicating with the one or more other nodes; as well as Based on the measured signal quality associated with the different transmit / receive beam pair, indicating to the different node of the one or more other nodes that the different transmit / receive beam pair is not to be used.

28. The apparatus according to claim 17, wherein The one or more processors are further configured to: indicating at least a portion of information from a transmit / receive beam pair list to a different one of the one or more other nodes, the transmit / receive beam pair list including an indication of whether each of the transmit / receive beam pairs is to be avoided or not to be avoided; as well as Based on at least a portion of the information, an indication is received from the different node to use a new transmit / receive beam pair in communicating with the one or more other nodes.

29. The apparatus according to claim 17, wherein The one or more processors are further configured to: receiving, from a different node of the one or more other nodes, information regarding transmit / receive beam pairs to be avoided or not avoided at the different node, wherein determining the transmit / receive beam pairs to be used by the node is additionally based on the information; and An indication is sent to the different node to use the determined transmit / receive beam pair in communicating with the node.

30. The apparatus of claim 17, wherein: The one or more processors are further configured to: indicating to different ones of the one or more other nodes an ability to generate null-shaped beams in one or more directions, or to generate beams having specified null characteristics in one or more directions relative to a direction having desired signal energy; as well as Based on the capabilities, an indication is received from the different node to use the transmit / receive beam pair in communicating with the one or more other nodes.

31. An apparatus for wireless communication, comprising: means for receiving an indication of a configured transmit / receive beam pair to be used by a node for full-duplex communication with one or more other nodes; means for measuring a signal quality of at least one receive beam while transmitting via each of one or more transmit beams associated with the at least one receive beam in full-duplex communication; as well as and means for determining a transmit / receive beam pair to be used by the node for the full-duplex communication with the one or more other nodes based at least in part on a measured signal quality of the at least one receive beam, wherein determining the transmit / receive beam pair to be used by the node comprises: replacing a transmit beam in the configured transmit / receive beam pair with a null-shaped beam that directs energy away from the receive beam in the configured transmit / receive beam pair based on the measured signal quality.

32. The apparatus of claim 31 , further comprising: Means for determining, for the node, a plurality of transmit beams comprising the one or more transmit beams and a plurality of receive beams comprising the at least one receive beam.

33. A non-transitory computer-readable medium comprising code executable by one or more processors for wireless communication, the code comprising code for: receiving an indication of a configured transmit / receive beam pair to be used by the node for full-duplex communication with one or more other nodes; measuring a signal quality of at least one receive beam while transmitting through each of the one or more transmit beams associated with the at least one receive beam in full-duplex communication; as well as and determining a transmit / receive beam pair to be used by the node for the full-duplex communication with the one or more other nodes based at least in part on a measured signal quality of the at least one receive beam, wherein determining the transmit / receive beam pair to be used by the node comprises replacing a transmit beam in the configured transmit / receive beam pair with a null-shaped beam that directs energy away from the receive beam in the configured transmit / receive beam pair based on the measured signal quality.

34. The computer-readable medium of claim 33, further comprising: Code for determining, for the node, a plurality of transmit beams comprising the one or more transmit beams and a plurality of receive beams comprising the at least one receive beam.

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