Patent Publication Number: US-2020280355-A1

Title: Control plane of a layer-1 millimeter wave repeater

Description:
CROSS-REFERENCE TO RELATED APPLICATION 
     This patent application claims priority to Provisional Patent Application No. 62/812,065, filed on Feb. 28, 2019, entitled “CONTROL PLANE OF A LAYER-1 MILLIMETER WAVE REPEATER,” and assigned to the assignee hereof. The disclosure of the prior application is considered part of and is incorporated by reference in this patent application. 
    
    
     INTRODUCTION 
     Aspects of the present disclosure generally relate to wireless communication, and more particularly to a millimeter wave repeater. 
     Wireless communication systems are widely deployed to provide various telecommunication services such as telephony, video, data, messaging, and broadcasts. Typical wireless communication systems may employ multiple-access technologies capable of supporting communication with multiple users by sharing available system resources (e.g., bandwidth, transmit power, and/or the like). Examples of such multiple-access technologies include code division multiple access (CDMA) systems, time division multiple access (TDMA) systems, frequency-division multiple access (FDMA) systems, orthogonal frequency-division multiple access (OFDMA) systems, single-carrier frequency-division multiple access (SC-FDMA) systems, time division synchronous code division multiple access (TD-SCDMA) systems, and Long Term Evolution (LTE). LTE/LTE-Advanced is a set of enhancements to the Universal Mobile Telecommunications System (UMTS) mobile standard promulgated by the Third Generation Partnership Project (3GPP). 
     A wireless communication network may include a number of base stations (BSs) that can support communication for a number of user equipment (UEs). A user equipment (UE) may communicate with a base station (BS) via the downlink and uplink. The downlink (or forward link) refers to the communication link from the BS to the UE, and the uplink (or reverse link) refers to the communication link from the UE to the BS. As will be described in more detail herein, a BS may be referred to as a Node B, a gNB, an access point (AP), a radio head, a transmit receive point (TRP), a New Radio (NR) BS, a 5G Node B, and/or the like. 
     The above multiple access technologies have been adopted in various telecommunication standards to provide a common protocol that enables different user equipment to communicate on a municipal, national, regional, and even global level. New Radio (NR), which may also be referred to as 5G, is a set of enhancements to the LTE mobile standard promulgated by the Third Generation Partnership Project (3GPP). NR is designed to better support mobile broadband Internet access by improving spectral efficiency, lowering costs, improving services, making use of new spectrum, and better integrating with other open standards using orthogonal frequency division multiplexing (OFDM) with a cyclic prefix (CP) (CP-OFDM) on the downlink (DL), using CP-OFDM and/or SC-FDM (e.g., also known as discrete Fourier transform spread OFDM (DFT-s-OFDM)) on the uplink (UL), as well as supporting beamforming, multiple-input multiple-output (MIMO) antenna technology, and carrier aggregation. However, as the demand for mobile broadband access continues to increase, there exists a need for further improvements in LTE and NR technologies. Preferably, these improvements may be applicable to other multiple access technologies and the telecommunication standards that employ these technologies. 
     SUMMARY 
     In some aspects, a method of wireless communication, performed by a base station, may include receiving, via a first interface of a repeater, information associated with a second interface of the repeater, the second interface being different from the first interface; determining a configuration for the second interface of the repeater based at least in part on the information associated with the second interface; and communicating the configuration for the second interface of the repeater via the first interface of the repeater. 
     In some aspects, a base station for wireless communication may include memory and one or more processors coupled to the memory. The memory and the one or more processors may be configured to receive, via a first interface of a repeater, information associated with a second interface of the repeater, the second interface being different from the first interface; determine a configuration for the second interface of the repeater based at least in part on the information associated with the second interface; and communicate the configuration for the second interface of the repeater via the first interface of the repeater. 
     In some aspects, a non-transitory computer-readable medium may store one or more instructions for wireless communication. The one or more instructions, when executed by one or more processors of a base station, may cause the one or more processors to: receive, via a first interface of a repeater, information associated with a second interface of the repeater, the second interface being different from the first interface; determine a configuration for the second interface of the repeater based at least in part on the information associated with the second interface; and communicate the configuration for the second interface of the repeater via the first interface of the repeater. 
     In some aspects, an apparatus for wireless communication may include means for receiving, via a first interface of a repeater, information associated with a second interface of the repeater, the second interface being different from the first interface; means for determining a configuration for the second interface of the repeater based at least in part on the information associated with the second interface; and means for communicating the configuration for the second interface of the repeater via the first interface of the repeater. 
     In some aspects, a method of wireless communication, performed by a repeater, may include transmitting, to a base station via a first interface, information associated with a second interface of the repeater, the second interface being different from the first interface; receiving, via the first interface and after transmitting the information associated with the second interface, a configuration for the second interface; and configuring the second interface of the repeater based at least in part on the configuration. 
     In some aspects, a repeater for wireless communication may include memory and one or more processors coupled to the memory. The memory and the one or more processors may be configured to transmit, to a base station via a first interface, information associated with a second interface of the repeater, the second interface being different from the first interface; receive, via the first interface and after transmitting the information associated with the second interface, a configuration for the second interface; and configure the second interface based at least in part on the configuration. 
     In some aspects, a non-transitory computer-readable medium may store one or more instructions for wireless communication. The one or more instructions, when executed by one or more processors of a repeater, may cause the one or more processors to: transmit, to a base station via a first interface, information associated with a second interface of the repeater, the second interface being different from the first interface; receive, via the first interface and after transmitting the information associated with the second interface, a configuration for the second interface; and configure the second interface based at least in part on the configuration. 
     In some aspects, an apparatus for wireless communication may include means for transmitting, to a base station via a first interface, information associated with a second interface of the repeater, the second interface being different from the first interface; means for receiving, via the first interface and after transmitting the information associated with the second interface, a configuration for the second interface; and means for configuring the second interface based at least in part on the configuration. 
     Aspects generally include a method, apparatus, system, computer program product, non-transitory computer-readable medium, user equipment, base station, wireless communication device, and processing system as substantially described herein with reference to and as illustrated by the accompanying drawings and specification. 
     The foregoing has outlined rather broadly the features and technical advantages of examples according to the disclosure in order that the detailed description that follows may be better understood. Additional features and advantages will be described hereinafter. The conception and specific examples disclosed may be readily utilized as a basis for modifying or designing other structures for carrying out the same purposes of the present disclosure. Such equivalent constructions do not depart from the scope of the appended claims. Characteristics of the concepts disclosed herein, both their organization and method of operation, together with associated advantages will be better understood from the following description when considered in connection with the accompanying figures. Each of the figures is provided for the purposes of illustration and description, and not as a definition of the limits of the claims. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       So that the above-recited features of the present disclosure can be understood in detail, a more particular description, briefly summarized above, may be had by reference to aspects, some of which are illustrated in the appended drawings. It is to be noted, however, that the appended drawings illustrate only certain typical aspects of this disclosure and are therefore not to be considered limiting of its scope, for the description may admit to other equally effective aspects. The same reference numbers in different drawings may identify the same or similar elements. 
         FIG. 1  is a block diagram conceptually illustrating an example of a wireless communication network, in accordance with various aspects of the present disclosure. 
         FIG. 2  is a block diagram conceptually illustrating an example of a base station in communication with a UE in a wireless communication network, in accordance with various aspects of the present disclosure. 
         FIG. 3  is a diagram illustrating examples of radio access networks, in accordance with various aspects of the present disclosure. 
         FIG. 4  is a diagram illustrating an example of communicating using a millimeter wave repeater, in accordance with various aspects of the present disclosure. 
         FIGS. 5A and 5B  are diagrams illustrating example millimeter wave repeaters, in accordance with various aspects of the present disclosure. 
         FIG. 6  is a diagram illustrating an example associated with a control plane of a millimeter wave repeater, in accordance with various aspects of the present disclosure. 
         FIGS. 7 and 8  are diagrams illustrating example processes associated with a control plane of a millimeter wave repeater, in accordance with various aspects of the present disclosure. 
     
    
    
     DETAILED DESCRIPTION 
     As described herein, a layer-1 millimeter wave (mmW) repeater may include components that enable receiving a signal on a receive antenna associated with a high frequency (HF) interface (e.g., a mmW interface), amplifying the power of the signal using a gain component, and transmitting the amplified signal on a transmit antenna associated with the HF interface. These operations may be orchestrated and/or controlled by a controller of the mmW repeater. In some aspects, the mmW repeater may include a communication component that enables communication via a low frequency (LF) interface (e.g., an interface that uses a sub-6 gigahertz (GHz) frequency) for transmission or reception of information associated with such control signals (e.g., to or from one or more base stations). 
     However, particular capabilities, configurations, and/or architectures of HF interfaces may vary among mmW repeaters. Hence, a configuration for an HF interface of a given mmW repeater may take into account a capability, a configuration, and an architecture of an HF interface of the given mmW repeater. Some aspects described herein provide techniques and apparatuses for a control plane design of a mmW repeater. In some aspects, a repeater may transmit, to a base station via an LF interface, information associated with an HF interface of the repeater. In some aspects, the base station may receive, via the LF interface, the information associated with the HF interface, may determine a configuration for the HF interface based at least in part on the information associated with the HF interface, and may communicate the configuration for the HF interface via the LF interface. In some aspects, the repeater may receive, via the LF interface, the configuration for the HF interface, and may configure the HF interface based at least in part on the configuration. 
     Various aspects of the disclosure are described more fully hereinafter with reference to the accompanying drawings. This disclosure may, however, be embodied in many different forms and should not be construed as limited to any specific structure or function presented throughout this disclosure. Rather, these aspects are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art. Based on the teachings herein one skilled in the art should appreciate that the scope of the disclosure is intended to cover any aspect of the disclosure disclosed herein, whether implemented independently of or combined with any other aspect of the disclosure. For example, an apparatus may be implemented or a method may be practiced using any number of the aspects set forth herein. In addition, the scope of the disclosure is intended to cover such an apparatus or method which is practiced using other structure, functionality, or structure and functionality in addition to or other than the various aspects of the disclosure set forth herein. It should be understood that any aspect of the disclosure disclosed herein may be embodied by one or more elements of a claim. 
     Several aspects of telecommunication systems will now be presented with reference to various apparatuses and techniques. These apparatuses and techniques will be described in the following detailed description and illustrated in the accompanying drawings by various blocks, modules, components, circuits, steps, processes, algorithms, and/or the like (collectively referred to as “elements”). These elements may be implemented using hardware, software, or combinations thereof. Whether such elements are implemented as hardware or software depends upon the particular application and design constraints imposed on the overall system. 
     It should be noted that while aspects may be described herein using terminology commonly associated with 3G and/or 4G wireless technologies, aspects of the present disclosure can be applied in other generation-based communication systems, such as 5G and later, including NR technologies. 
       FIG. 1  is a diagram illustrating a wireless network  100  in which aspects of the present disclosure may be practiced. The wireless network  100  may be an LTE network, a 5G or NR network, and/or the like. The wireless network  100  may include a number of BSs  110  (shown as BS  110   a , BS  110   b , BS  110   c , and BS  110   d ) and other network entities. A BS is an entity that communicates with user equipment (UEs) and may also be referred to as a base station, a NR BS, a Node B, a gNB, a 5G node B (NB), an access point, a transmit receive point (TRP), and/or the like. Each BS may provide communication coverage for a particular geographic area. In 3GPP, the term “cell” can refer to a coverage area of a BS and/or a BS subsystem serving this coverage area, depending on the context in which the term is used. 
     A BS may provide communication coverage for a macro cell, a pico cell, a femto cell, and/or another type of cell. A macro cell may cover a relatively large geographic area (e.g., several kilometers in radius) and may allow unrestricted access by UEs with service subscription. A pico cell may cover a relatively small geographic area and may allow unrestricted access by UEs with service subscription. A femto cell may cover a relatively small geographic area (e.g., a home) and may allow restricted access by UEs having association with the femto cell (e.g., UEs in a closed subscriber group (CSG)). ABS for a macro cell may be referred to as a macro BS. ABS for a pico cell may be referred to as a pico BS. A BS for a femto cell may be referred to as a femto BS or a home BS. In the example shown in  FIG. 1 , a BS  110   a  may be a macro BS for a macro cell  102   a , a BS  110   b  may be a pico BS for a pico cell  102   b , and a BS  110   c  may be a femto BS for a femto cell  102   c . A BS may support one or multiple (e.g., three) cells. The terms “eNB”, “base station”, “NR BS”, “gNB”, “TRP”, “AP”, “node B”, “5G NB”, and “cell” may be used interchangeably herein. 
     In some examples, a cell may not necessarily be stationary, and the geographic area of the cell may move according to the location of a mobile BS. In some examples, the BSs may be interconnected to one another and/or to one or more other BSs or network nodes (not shown) in the wireless network  100  through various types of backhaul interfaces such as a direct physical connection, a virtual network, and/or the like using any suitable transport network. 
     Wireless network  100  may also include relay stations. A relay station is an entity that can receive a transmission of data from an upstream station (e.g., a BS or a UE) and send a transmission of the data to a downstream station (e.g., a UE or a BS). A relay station may also be a UE that can relay transmissions for other UEs. In the example shown in  FIG. 1 , a relay station  110   d  may communicate with macro BS  110   a  and a UE  120   d  in order to facilitate communication between BS  110   a  and UE  120   d . A relay station may also be referred to as a relay BS, a relay base station, a relay, and/or the like. 
     Wireless network  100  may be a heterogeneous network that includes BSs of different types, e.g., macro BSs, pico BSs, femto BSs, relay BSs, and/or the like. These different types of BSs may have different transmit power levels, different coverage areas, and different impacts on interference in wireless network  100 . For example, macro BSs may have a high transmit power level (e.g., 5 to 40 Watts) whereas pico BSs, femto BSs, and relay BSs may have lower transmit power levels (e.g., 0.1 to 2 Watts). 
     A network controller  130  may couple to a set of BSs and may provide coordination and control for these BSs. Network controller  130  may communicate with the BSs via a backhaul. The BSs may also communicate with one another, e.g., directly or indirectly via a wireless or wireline backhaul. 
     UEs  120  (e.g.,  120   a ,  120   b ,  120   c ,  120   d ,  120   e ,  120   f , and/or the like) may be dispersed throughout wireless network  100 , and each UE may be stationary or mobile. A UE may also be referred to as an access terminal, a terminal, a mobile station, a subscriber unit, a station, and/or the like. A UE may be a cellular phone (e.g., a smart phone), a personal digital assistant (PDA), a wireless modem, a wireless communication device, a handheld device, a laptop computer, a cordless phone, a wireless local loop (WLL) station, a tablet, a camera, a gaming device, a netbook, a smartbook, an ultrabook, a medical device or equipment, biometric sensors/devices, wearable devices (smart watches, smart clothing, smart glasses, smart wrist bands, smart jewelry (e.g., smart ring, smart bracelet)), an entertainment device (e.g., a music or video device, or a satellite radio), a vehicular component or sensor, smart meters/sensors, industrial manufacturing equipment, a global positioning system device, or any other suitable device that is configured to communicate via a wireless or wired medium. 
     Some UEs may be considered machine-type communication (MTC) or evolved or enhanced machine-type communication (eMTC) UEs. MTC and eMTC UEs include, for example, robots, drones, remote devices, sensors, meters, monitors, location tags, and/or the like, that may communicate with a base station, another device (e.g., remote device), or some other entity. A wireless node may provide, for example, connectivity for or to a network (e.g., a wide area network such as Internet or a cellular network) via a wired or wireless communication link. Some UEs may be considered Internet-of-Things (IoT) devices, and/or may be implemented as NB-IoT (narrowband internet of things) devices. Some UEs may be considered a Customer Premises Equipment (CPE). UE  120  may be included inside a housing that houses components of UE  120 , such as processor components, memory components, and/or the like. 
     In general, any number of wireless networks may be deployed in a given geographic area. Each wireless network may support a particular RAT and may operate on one or more frequencies. A RAT may also be referred to as a radio technology, an air interface, and/or the like. A frequency may also be referred to as a carrier, a frequency channel, and/or the like. Each frequency may support a single RAT in a given geographic area in order to avoid interference between wireless networks of different RATs. In some cases, NR or 5G RAT networks may be deployed. 
     In some aspects, two or more UEs  120  (e.g., shown as UE  120   a  and UE  120   e ) may communicate directly using one or more sidelink channels (e.g., without using a base station  110  as an intermediary to communicate with one another). For example, the UEs  120  may communicate using peer-to-peer (P2P) communications, device-to-device (D2D) communications, a vehicle-to-everything (V2X) protocol (e.g., which may include a vehicle-to-vehicle (V2V) protocol, a vehicle-to-infrastructure (V2I) protocol, and/or the like), a mesh network, and/or the like. In this case, the UE  120  may perform scheduling operations, resource selection operations, and/or other operations described elsewhere herein as being performed by the base station  110 . 
     In some aspects, millimeter wave (mmW) repeater  140  (sometimes referred to herein as a repeater  140 ) may receive an analog millimeter wave signal from a base station  110 , may amplify the analog millimeter wave signal, and may transmit the amplified millimeter wave signal to one or more UEs  120  (e.g., shown as UE  120   f ). In some aspects, the mmW repeater  140  may be an analog mmW repeater, sometimes also referred to as a layer-1 mmW repeater. Additionally, or alternatively, the repeater mmW  140  may be a wireless transmit receive point (TRP) acting as a distributed unit (e.g., of a 5G access node) that communicates wirelessly with a base station  110  acting as a central unit or an access node controller (e.g., of the 5G access node). The mmW repeater may receive, amplify, and transmit the analog mmW signal without performing analog-to-digital conversion of the analog mmW signal and/or without performing any digital signal processing on the mmW signal. In this way, latency may be reduced and a cost to produce the mmW repeater  140  may be reduced. Additional details regarding mmW repeater  140  are provided elsewhere herein. 
     As shown in  FIG. 1 , the base station  110  may include a communication manager  115 . As described in more detail elsewhere herein, the communication manager  115  may receive, via a first interface of mmW repeater  140 , information associated with a second interface of mmW repeater  140 , the second interface being different from the first interface; determine a configuration for the second interface of mmW repeater  140  based at least in part on the information associated with the HF interface; and communicate the configuration for the second interface of mmW repeater  140  via the first interface of mmW repeater  140 . Additionally, or alternatively, the communication manager  115  may perform one or more other operations described herein. 
     As indicated above,  FIG. 1  is provided merely as an example. Other examples may differ from what is described with regard to  FIG. 1 . 
       FIG. 2  shows a block diagram of a design  200  of base station  110  and UE  120 , which may respectively be one of the base stations and one of the UEs in  FIG. 1 . Base station  110  may be equipped with T antennas  234   a  through  234   t , and UE  120  may be equipped with R antennas  252   a  through  252   r , where in general T≥1 and R≥1. 
     At base station  110 , a transmit processor  220  may receive data from a data source  212  for one or more UEs, select one or more modulation and coding schemes (MCS) for each UE based at least in part on channel quality indicators (CQIs) received from the UE, process (e.g., encode and modulate) the data for each UE based at least in part on the MCS(s) selected for the UE, and provide data symbols for all UEs. Transmit processor  220  may also process system information (e.g., for semi-static resource partitioning information (SRPI) and/or the like) and control information (e.g., CQI requests, grants, upper layer signaling, and/or the like) and provide overhead symbols and control symbols. Transmit processor  220  may also generate reference symbols for reference signals (e.g., the cell-specific reference signal (CRS)) and synchronization signals (e.g., the primary synchronization signal (PSS) and secondary synchronization signal (SSS)). A transmit (TX) multiple-input multiple-output (MIMO) processor  230  may perform spatial processing (e.g., precoding) on the data symbols, the control symbols, the overhead symbols, and/or the reference symbols, if applicable, and may provide T output symbol streams to T modulators (MODs)  232   a  through  232   t . Each modulator  232  may process a respective output symbol stream (e.g., for OFDM and/or the like) to obtain an output sample stream. Each modulator  232  may further process (e.g., convert to analog, amplify, filter, and upconvert) the output sample stream to obtain a downlink signal. T downlink signals from modulators  232   a  through  232   t  may be transmitted via T antennas  234   a  through  234   t , respectively. According to various aspects described in more detail below, the synchronization signals can be generated with location encoding to convey additional information. 
     At UE  120 , antennas  252   a  through  252   r  may receive the downlink signals from base station  110  and/or other base stations and may provide received signals to demodulators (DEMODs)  254   a  through  254   r , respectively. Each demodulator  254  may condition (e.g., filter, amplify, downconvert, and digitize) a received signal to obtain input samples. Each demodulator  254  may further process the input samples (e.g., for OFDM and/or the like) to obtain received symbols. A MIMO detector  256  may obtain received symbols from all R demodulators  254   a  through  254   r , perform MIMO detection on the received symbols if applicable, and provide detected symbols. A receive processor  258  may process (e.g., demodulate and decode) the detected symbols, provide decoded data for UE  120  to a data sink  260 , and provide decoded control information and system information to a controller/processor  280 . A channel processor may determine reference signal received power (RSRP), received signal strength indicator (RSSI), reference signal received quality (RSRQ), channel quality indicator (CQI), and/or the like. In some aspects, one or more components of UE  120  may be included in a housing. 
     On the uplink, at UE  120 , a transmit processor  264  may receive and process data from a data source  262  and control information (e.g., for reports comprising RSRP, RSSI, RSRQ, CQI, and/or the like) from controller/processor  280 . Transmit processor  264  may also generate reference symbols for one or more reference signals. The symbols from transmit processor  264  may be precoded by a TX MIMO processor  266  if applicable, further processed by modulators  254   a  through  254   r  (e.g., for DFT-s-OFDM, CP-OFDM, and/or the like), and transmitted to base station  110 . At base station  110 , the uplink signals from UE  120  and other UEs may be received by antennas  234 , processed by demodulators  232 , detected by a MIMO detector  236  if applicable, and further processed by a receive processor  238  to obtain decoded data and control information sent by UE  120 . Receive processor  238  may provide the decoded data to a data sink  239  and the decoded control information to controller/processor  240 . Base station  110  may include communication unit  244  and communicate to network controller  130  via communication unit  244 . Network controller  130  may include communication unit  294 , controller/processor  290 , and memory  292 . 
     Controller/processor  240  of base station  110  and/or any other component(s) of  FIG. 2  may perform one or more techniques associated with a control plane for a mmW repeater, as described in more detail elsewhere herein. For example, controller/processor  240  of base station  110  and/or any other component(s) of  FIG. 2  may perform or direct operations of, for example, process  700  of  FIG. 7 , process  800  of  FIG. 8 , and/or other processes as described herein. Memories  242  may store data and program codes for base station  110 , respectively. A scheduler  246  may schedule UEs for data transmission on the downlink and/or uplink. 
     In some aspects, the base station  110  may include means for receiving, via a first interface of mmW repeater  140 , information associated with a second interface of mmW repeater  140 , the second interface being different from the first interface; means for determining a configuration for the second interface of mmW repeater  140  based at least in part on the information associated with the second interface; means for communicating the configuration for the second interface of mmW repeater  140  via the first interface of mmW repeater  140 ; and/or the like. Additionally, or alternatively, the base station  110  may include means for performing one or more other operations described herein. In some aspects, such means may include the communication manager  115 . In some aspects, such means may include one or more components of the base station  110  described in connection with  FIG. 2 . 
     As indicated above,  FIG. 2  is provided merely as an example. Other examples may differ from what is described with regard to  FIG. 2 . 
       FIG. 3  is a diagram illustrating examples  300  of radio access networks, in accordance with various aspects of the disclosure. 
     As shown by reference number  305 , a traditional (e.g., 3G, 4G, LTE, and/or the like) radio access network may include multiple base stations  310  (e.g., access nodes (AN)), where each base station  310  communicates with a core network via a wired backhaul link  315 , such as a fiber connection. A base station  310  may communicate with a UE  320  via an access link  325 , which may be a wireless link. In some aspects, a base station  310  shown in  FIG. 3  may correspond to a base station  110  shown in  FIG. 1 . Similarly, a UE  320  shown in  FIG. 3  may correspond to a UE  120  shown in  FIG. 1 . 
     As shown by reference number  330 , a radio access network may include a wireless backhaul network, sometimes referred to as an integrated access and backhaul (IAB) network. In an IAB network, at least one base station is an anchor base station  335  that communicates with a core network via a wired backhaul link  340 , such as a fiber connection. An anchor base station  335  may also be referred to as an IAB donor (or IAB-donor). The IAB network may include one or more non-anchor base stations  345 , sometimes referred to as relay base stations or IAB nodes (or IAB-nodes). The non-anchor base station  345  may communicate directly with or indirectly with (e.g., via one or more non-anchor base stations  345 ) the anchor base station  335  via one or more backhaul links  350  to form a backhaul path to the core network for carrying backhaul traffic. Backhaul link  350  may be a wireless link. Anchor base station(s)  335  and/or non-anchor base station(s)  345  may communicate with one or more UEs  355  via access links  360 , which may be wireless links for carrying access traffic. In some aspects, an anchor base station  335  and/or a non-anchor base station  345  shown in  FIG. 3  may correspond to a base station  110  shown in  FIG. 1 . Similarly, a UE  355  shown in  FIG. 3  may correspond to a UE  120  shown in  FIG. 1 . 
     As shown by reference number  365 , in some aspects, a radio access network that includes an IAB network may utilize millimeter wave technology and/or directional communications (e.g., beamforming, precoding and/or the like) for communications between base stations and/or UEs (e.g., between two base stations, between two UEs, and/or between a base station and a UE). For example, wireless backhaul links  370  between base stations may use millimeter waves to carry information and/or may be directed toward a target base station using beamforming, precoding, and/or the like. Similarly, the wireless access links  375  between a UE and a base station may use millimeter waves and/or may be directed toward a target wireless node (e.g., a UE and/or a base station). In this way, inter-link interference may be reduced. 
     In some aspects, an IAB network may support a multi-hop wireless backhaul. Additionally, or alternatively, nodes of an IAB network may use the same radio access technology (e.g., 5G/NR). Additionally, or alternatively, nodes of an IAB network may share resources for access links and backhaul links, such as time resources, frequency resources, spatial resources, and/or the like. Furthermore, various architectures of IAB nodes and/or IAB donors may be supported. 
     The configuration of base stations and UEs in  FIG. 3  is shown as an example, and other examples are contemplated. For example, one or more base stations illustrated in  FIG. 3  may be replaced by one or more UEs that communicate via a UE-to-UE access network (e.g., a peer-to-peer network, a device-to-device network, and/or the like). In this case, an anchor node may refer to a UE that is directly in communication with a base station (e.g., an anchor base station or a non-anchor base station). 
     As indicated above,  FIG. 3  is provided as an example. Other examples may differ from what is described with regard to  FIG. 3 . 
       FIG. 4  is a diagram illustrating an example  400  of communicating using an analog millimeter wave repeater, in accordance with various aspects of the present disclosure. 
     Because millimeter wave communications have a higher frequency and shorter wavelength than other types of radio waves used for communications (e.g., sub-6 GHz communications), millimeter wave communications may have shorter propagation distances and may be more easily blocked by obstructions than other types of radio waves. For example, a wireless communication that uses sub-6 GHz radio waves may be capable of penetrating a wall of a building or a structure to provide coverage to an area on an opposite side of the wall from a base station  110  that communicates using the sub-6 GHz radio waves. However, a millimeter wave may not be capable of penetrating the same wall (e.g., depending on a thickness of the wall, a material from which the wall is constructed, and/or the like). Some techniques and apparatuses described herein use a millimeter wave repeater  140  to increase the coverage area of a base station  110 , to extend coverage to UEs  120  without line of sight to the base station  110  (e.g., due to an obstruction), and/or the like. Furthermore, the millimeter wave repeater  140  described herein may be a layer 1 or an analog millimeter wave repeater, which is associated with a lower cost, less processing, and lower latency than a layer 2 or layer 3 repeater. 
     As shown in  FIG. 4 , a millimeter wave repeater  140  may perform directional communication by using beamforming to communicate with a base station  110  via a first beam (e.g., a backhaul beam over a backhaul link with the base station  110 ) and to communicate with a UE  120  via a second beam (e.g., an access beam over an access link with the UE  120 ). To achieve long propagation distances and/or to satisfy a required link budget, the millimeter wave repeater may use narrow beams (e.g., with a beam width less than a threshold) for such communications. 
     However, using a narrower beam requires the use of more resources of the millimeter wave repeater  140  (e.g., processing resources, memory resources, power, battery power, and/or the like) and more network resources (e.g., time resources, frequency resources, spatial resources, and/or the like), as compared to a wider beam, to perform beam training (e.g., to determine a suitable beam), beam maintenance (e.g., to find suitable beam as conditions change due to mobility and/or the like), beam management, and/or the like. This may waste resources of the millimeter wave repeater  140  and/or network resources as compared to using a wider beam, and may lead to increased cost of production of millimeter wave repeaters  140 , which may be deployed extensively throughout a radio access network. 
     For example, a millimeter wave repeater  140  may be deployed in a fixed location with limited or no mobility, similar to a base station  110 . As shown in  FIG. 4 , the millimeter wave repeater  140  may use a narrower beam to communicate with the base station  110  without unnecessarily consuming network resources and/or resources of the millimeter wave repeater  140  because the need for beam training, beam maintenance, and/or beam management may be limited, due to limited or no mobility of the base station  110  and the millimeter wave repeater  140  (and/or due to a line of sight communication path between the base station  110  and the millimeter wave repeater  140 ). 
     As further shown in  FIG. 4 , the millimeter wave repeater  140  may use a wider beam (e.g., a pseudo-omnidirectional beam and/or the like) to communicate with one or more UEs  120 . This wider beam may provide wider coverage for access links, thereby providing coverage to mobile UEs  120  without requiring frequent beam training, beam maintenance, and/or beam management. In this way, network resources and/or resources of the millimeter wave repeater  140  may be conserved. Furthermore, if the millimeter wave repeater  140  does not include digital signal processing capabilities, resources of the base station  110  (e.g., processing resources, memory resources, and/or the like) may be conserved that would otherwise be used to perform such signal processing for the millimeter wave repeater  140 , and network resources may be conserved that would otherwise be used to communicate input to or output of such processing between the base station  110  and the millimeter wave repeater  140 . 
     In this way, the millimeter wave repeater  140  may increase a coverage area, provide access around obstructions (as shown), and/or the like, while conserving resources of the base station  110 , resources of the millimeter wave repeater  140 , network resources, and/or the like. Additional details are described below. 
     As indicated above,  FIG. 4  is provided as an example. Other examples may differ from what is described with regard to  FIG. 4 . 
       FIGS. 5A and 5B  are diagrams illustrating examples of a millimeter wave repeater  500 , in accordance with various aspects of the present disclosure. In some aspects, millimeter wave repeater  500  may correspond to millimeter wave repeater  140  shown in  FIG. 1 . 
     As shown in  FIG. 5A , in some aspects, the millimeter wave repeater  500  may include one or more phased array antennas  510 - 1  through  510 -N (N&gt;1), a gain component  520 , a controller  530 , a communication component  540 , and a multiplexer (MUX) and/or demultiplexer (DEMUX) (MUX/DEMUX)  550 . 
     As shown in  FIG. 5B , in some aspects, the millimeter wave repeater  500  may include one or more metamaterial antennas  510 ′- 1  through  510 ′-N, gain component  520 , controller  530 , communication component  540 , and one or more MUX/DEMUX  550 . 
     An antenna  510 / 510 ′ includes one or more antenna elements capable of being configured for beamforming. In some aspects, as illustrated in  FIG. 5A , millimeter wave repeater  500  may include one or more phased array antennas  510 , which may be referred to as a phased array because phase values and/or phase offsets of the antenna elements may be configured to form a beam, with different phase values and/or phase offsets being used for different beams (e.g., in different directions). 
     In some aspects, as illustrated in  FIG. 5B , millimeter wave repeater  500  may include one or more metamaterial antennas  510 ′. In some aspects, a metamaterial antenna may comprise a synthetic material with negative permittivity and/or permeability, which yields a negative refractive index. Due to the resulting superior antenna gain and electro-magnetic lensing, the metamaterial antenna may not need to be used in a phased-array configuration. However, if in phased-array configuration, antenna spacing could be less than a typically used spacing of lambda/2, where lambda refers to a wavelength of the RF carrier signal. In some aspects, due to superior beamforming, the metamaterial antenna may reduce leakage back to the receive (RX) antenna and may reduce a chance of instability in the RF chain. Hence, the use of metamaterial antennas may reduce or obviate a need for a feedback path. 
     In some aspects, an antenna  510 / 510 ′ may be a fixed RX antenna capable of only receiving communications, and not transmitting communications. In some aspects, an antenna  510 / 510 ′ may be a fixed transmit (TX) antenna capable of only transmitting communications, and not receiving communications. In some aspects, an antenna  510 / 510 ′ may be capable of being configured to act as an RX antenna or a TX antenna (e.g., via a TX/RX switch, a MUX/DEMUX, and/or the like). The antennas  510 / 510 ′ may be capable of communicating using millimeter waves. 
     Gain component  520  includes a component capable of amplifying an input signal and outputting an amplified signal. For example, gain component  520  may include a power amplifier, a variable gain component, and/or the like. In some aspects, gain component  520  may have variable gain control. The gain component  520  may connect to an RX antenna (e.g., a first antenna  510 / 510 ′- 1 ) and a TX antenna (e.g., a second antenna  510 / 510 ′- 2 ) such that an analog millimeter wave signal, received via the RX antenna, can be amplified by the gain component  520  and output to the TX antenna for transmission. In some aspects, the level of amplification of the gain component  520  may be controlled by the controller  530 . 
     Controller  530  includes a component capable of controlling one or more other components of the millimeter wave repeater  500 . For example, the controller  530  may include a controller, a microcontroller, a processor, and/or the like. In some aspects, the controller  530  may control the gain component  520  by controlling a level of amplification or gain applied by the gain component  520  to an input signal. Additionally, or alternatively, the controller  530  may control an antenna  510 / 510 ′ by controlling a beamforming configuration for the antenna  510 / 510 ′ (e.g., one or more phase values for the antenna  510 / 510 ′, one or more phase offsets for the antenna  510 / 510 ′, one or more power parameters for the antenna  510 / 510 ′, one or more beamforming parameters for the antenna  510 / 510 ′, a TX beamforming configuration, an RX beamforming configuration, and/or the like), by controlling whether the antenna  510 / 510 ′ acts as an RX antenna or a TX antenna (e.g., by configuring interaction and/or connections between the antenna  510 / 510 ′ and a MUX/DEMUX  550 ), and/or the like. Additionally, or alternatively, the controller  530  may power on or power off one or more components of millimeter wave repeater  500  (e.g., when a base station  110  does not need to use the millimeter wave repeater to serve UEs  120 ). In some aspects, the controller  530  may control a timing of one or more of the above configurations. 
     Communication component  540  may include a component capable of wirelessly communicating with a base station  110  using a wireless technology other than millimeter wave. For example, the communication component  540  may communicate with the base station  110  using a personal area network (PAN) technology (e.g., Bluetooth, Bluetooth Low Energy (BLE), and/or the like), a 4G or LTE radio access technology, a narrowband Internet of Things (NB-IoT) technology, a visible light communication technology, and/or the like. In general, the communication component  540  enables communication (e.g., with base station  110 ) via a low frequency (LF) interface (e.g., an interface that uses a sub-6 GHz frequency). In some aspects, the communication component  540  may use a low frequency communication technology, and an antenna  510 / 510 ′ may use a higher frequency (HF) communication technology (e.g., millimeter wave and/or the like). In some aspects, an antenna  510 / 510 ′ may be used to transfer data between the millimeter wave repeater  500  and the base station  110 , and the communication component  540  may be used to transfer control information between the millimeter wave repeater  500  and the base station  110  (e.g., a report, a configuration, instructions to power on or power off one or more components, and/or the like). 
     MUX/DEMUX  550  may be used to multiplex and/or demultiplex communications received from and/or transmitted to an antenna  510 / 510 ′. For example, MUX/DEMUX  550  may be used to switch an RX antenna to a TX antenna. 
     In some aspects, the millimeter wave repeater  500  does not include any components for digital signal processing. For example, the millimeter wave repeater  500  may not include a digital signal processor, a baseband processor, a digital-to-analog converter (DAC), an analog-to-digital converter (ADC), and/or the like. In this way, a cost to produce the millimeter wave repeater  500  may be reduced. Furthermore, latency may be reduced by eliminating digital processing of received millimeter wave signals prior to transmission of corresponding amplified millimeter wave signals. 
     In some aspects, one or more antennas  510 / 510 ′, gain component  520 , controller  530 , communication component  540 , MUX/DEMUX  550 , and/or the like may perform one or more operations associated with a control plane of the millimeter wave repeater  500 , as described in more detail elsewhere herein. For example, one or more components of millimeter wave repeater  500  may perform or direct operations of, for example, process  700  of  FIG. 7 , process  800  of  FIG. 8 , and/or other processes as described herein. 
     In some aspects, millimeter wave repeater  500  may include means for transmitting, to base station  110  via a first interface of millimeter wave repeater  500  information associated with a second interface of millimeter wave repeater  500 , the second interface being different from the first interface; means for receiving, via the first interface and after transmitting the information associated with the second interface, a configuration for the second interface of millimeter wave repeater  500 ; means for configuring the second interface of millimeter wave repeater  500  based at least in part on the configuration; and/or the like. In some aspects, such means may include one or more components of millimeter wave repeater  500  described in connection with  FIGS. 5A and 5B . 
     As indicated above,  FIGS. 5A and 5B  are provided as an example. Other examples may differ from what is described with regard to  FIGS. 5A and 5B . For example, millimeter wave repeater  500  may include additional components, fewer components, different components, or differently arranged components than those shown in  FIGS. 5A and 5B . Furthermore, two or more components shown in  FIGS. 5A and 5B  may be implemented within a single component, or a single component shown in  FIGS. 5A and 5B  may be implemented as multiple components. Additionally, or alternatively, a set of components (e.g., one or more components) of millimeter wave repeater  500  may perform one or more functions described as being performed by another set of components of millimeter wave repeater  500 . 
     As described above, a mmW repeater  140  may include components that enable receiving a signal on a RX antenna (e.g., antenna  510 / 510 ′- 1 ) associated with a high frequency (HF) interface (e.g., a mmW interface), amplifying the power of the signal using gain component  520 , and transmitting the amplified signal on TX antenna (e.g., antenna  510 / 510 ′- 2 ) associated with the HF interface. These operations may be orchestrated and/or controlled by controller  530 . In some aspects, mmW repeater  140  may include communication component  540  that enables communication via an LF interface (e.g., an interface that uses a sub-6 GHz frequency) for transmission or reception of information associated with such control signals (e.g., to or from one or more base stations  110 ). 
     However, particular capabilities, configurations, and/or architectures of HF interfaces may vary among mmW repeaters  140 . Hence, a configuration for an HF interface of a given mmW repeater  140  may take into account a capability, a configuration, and an architecture of an HF interface of the given mmW repeater  140 . Some aspects described herein provide techniques and apparatuses for a control plane design of a mmW repeater  140 . 
       FIG. 6  is a diagram illustrating an example  600  associated with a control plane of mmW repeater  140 , in accordance with various aspects of the present disclosure. 
     As shown in  FIG. 6 , and by reference number  605 , mmW repeater  140  may transmit information associated with an HF interface (e.g., a mmW interface) of mmW repeater  140 . In some aspects, mmW repeater  140  may transmit the information associated with the HF interface via an LF interface of mmW repeater  140 . 
     In some aspects, mmW repeater  140  may transmit the information associated with the HF interface based at least in part on a request transmitted by base station  110 . For example, base station  110  may transmit, to mmW repeater  140  and via an LF interface of base station  110 , a request for the information associated with the HF interface of mmW repeater  140 . Here, mmW repeater  140  may receive the request via the LF interface of mmW repeater  140 , and may transmit the information associated with the HF interface based at least in part on receiving the request. 
     In some aspects, mmW repeater  140  may transmit the information associated with the HF interface after a connection between mmW repeater  140  and base station  110 . For example, mmW repeater  140  and base station  110  may establish a connection via their respective LF interfaces, and mmW repeater  140  may transmit the information associated with the HF interface via the LF interface of the mmW repeater  140  after the connection is established. 
     In some aspects, the information associated with the HF interface includes information associated with a capability associated with the HF interface of mmW repeater  140 , a configuration of the HF interface of mmW repeater  140 , and/or an architecture of the HF interface of mmW repeater  140 . 
     For example, in some aspects, the information associated with the HF interface of mmW repeater  140  includes information that identifies one or more components of the HF interface and capability information associated with the one or more components of the HF interface. 
     As a particular example, the information associated with the HF interface of mmW repeater  140  may include information associated with antennas  510 / 510 ′ and their associated configurations. For example, when antenna  510 / 510 ′ includes a phased array, the information associated with the HF interface may include information that identifies a number of antenna elements in each antenna, a type of a given antenna, a polarization of a given antenna, an arrangement of the antennas, relative locations of the antennas, a beam correspondence capability of a given antenna, and/or the like. As another particular example, when antenna  510 / 510 ′ includes a metamaterial antenna, the information associated with the HF interface may include information that identifies a beam steering latency associated with the antenna, a frequency range associated with the antenna, a bandwidth associated with the antenna, whether the antenna is capable of creating multiple simultaneous beams (e.g., a composite beam), and/or the like. As another particular example, the information associated with the HF interface of mmW repeater  140  may include information associated with an amplifier of mmW repeater  140  (e.g., a low noise amplifier, a power amplifier, and/or the like), such as a type of the amplifier, an amplification capability of the amplifier, a location of the amplifier, and/or the like. As another particular example, the information associated with the HF interface of mmW repeater  140  may include information associated with a TX/RX switch of mmW repeater  140 , such as a number of TX/RX switches, a switching speed of a given TX/RX switch, a location of a given TX/RX switch, and/or the like. As another particular example, the information associated with the HF interface of mmW repeater  140  may include information associated with a power detector of mmW repeater  140  (e.g., whether mmW repeater  140  can measure received power on a given antenna  510 / 510 ′). As another particular example, the information associated with the HF interface of mmW repeater  140  may include information associated with a signal generator of mmW repeater  140  (e.g., whether mmW repeater  140  can generate an HF signal for transmission on the HF interface). 
     As another example, the information associated with the HF interface of mmW repeater  140  may include information that describes interconnection of two or more components of the HF interface of mmW repeater  140 . For example, the information associated with the HF interface may include information that describes connections between antennas  510 / 510 ′ of mmW repeater  140 , information that identifies a number of TX/RX chains of mmW repeater  140 , and/or the like. 
     As another example, the information associated with the HF interface of mmW repeater  140  may include information that describes a beamforming configuration associated with the HF interface of mmW repeater  140 . In some aspects, the information that describes the beamforming configuration may include, for example, information associated with a TX/RX beamforming codebook (e.g., a number of beams, beam widths, a number of layers, and/or the like), a spatial quasi co-location (QCL) indication, and/or the like. 
     As further shown in  FIG. 6 , base station  110  may receive the information associated with the HF interface and, as shown by reference number  610 , may determine a configuration for the HF interface of mmW repeater  140  based at least in part on the information associated with the HF interface. 
     In some aspects, the configuration includes information associated with a configuration of the HF interface of mmW repeater  140 . For example, the configuration may include information associated with powering on one or more components of the HF of the repeater (e.g., an indication that the one or more components are to be powered off) or information associated with powering off one or more components of the second interface of the repeater (e.g., an indication that the one or more components are to be powered on). As another example, the configuration may include information associated with setting a gain of a power amplifier. As another example, the configuration may include information associated with a TX beam beamforming configuration and/or information associated with an RX beam beamforming configuration. As another example, the configuration may include information associated with measuring receive power on a given antenna  510 / 510 ′. As another example, the configuration may include information associated with generating or transmitting a signal using the HF interface. As another example, the configuration may include information associated with performing beam sweeping (e.g., an indication of whether mmW repeater  140  is to perform beam sweeping). As another example, the configuration may include information associated with a set of time-domain resources on which to apply the configuration (e.g., information that identifies a set of time-domain resources for which a given configuration is to be applied). 
     As further shown in  FIG. 6 , and by reference number  615 , base station  110  may communicate the configuration for the HF interface of mmW repeater  140  to mmW repeater  140 . In some aspects, base station  110  may communicate the configuration via the LF interface of mmW repeater  140 . In some aspects, base station may communicate the configuration in a control command. 
     In some aspects, base station  110  may communicate one or more items of information associated with the configuration in a set of control fields of the control command. The set of control fields may include, for example, a timing configuration field, a beamforming configuration field, a power configuration field, an operating mode field (e.g., indicating whether a given antenna  510 / 510 ′ is to be used for transmission or reception; indicating whether the given antenna  510 / 510 ′ is to be powered on, powered off, or remain in a current state; and/or the like). 
     In some aspects, the configuration indicates an active setting associated with the HF interface of mmW repeater  140 . The active setting may be associated with, for example, configuring mmW repeater  140  to adopt a set of parameters, included in a set of control command fields, according to a timing configuration include in the control command. In some aspects, active settings can be used in order to support a dynamic setting, a semi-persistent setting, and/or a periodic setting associated with the configuration of the HF interface of mmW repeater  140 . In some aspects, the active setting may indicate that mmW repeater  140  is to to adopt a beamforming configuration or a power setting for an upcoming communication. In some aspects, a control command may explicitly carry values of relevant parameters (e.g., a beam forming configuration, a power setting, and/or the like). Alternatively, in some aspects, the control command may indicate (e.g., by providing an index) a value that has been preconfigured using a passive setting. 
     In some aspects, the configuration indicates a passive setting associated with the HF interface of mmW repeater  140 . The passive setting may be associated with, for example, providing mmW repeater  140  with information to preconfigure a table to be stored on mmW repeater  140 . As another example, the passive setting may be a setting associated with a beamforming configuration that can be activated at a later time (e.g., using a control command). In some aspects, passive settings can be used in accordance with activation commands by, for example, providing mmW repeater  140  with control command that includes a row index to the preconfigured table (e.g., when the row of the preconfigured table includes information that identifies one or more configuration parameters for the HF interface of mmW repeater  140 ). In general, a passive setting may include one or more sets of configurations capable of being activated at a later time (e.g., by providing a control command, associated with the passive setting, to the UE at a later time). 
     In some aspects, the configuration may be used to semi-statically configure a first parameter associated with the HF interface and to dynamically configure a second parameter associated with the HF interface. In other words, in some aspects, the configuration may cause various parameters, associated with the HF interface of mmW repeater  140 , to be configured at different time scales. For example, an on-off period associated with a given antenna  510 / 510 ′ may be semi-statically configured, while a beamforming configuration (within on periods) may be dynamically configured. As another example, a beamforming configuration may be semi-static, while on-off periods may be dynamically configured. 
     As shown in  FIG. 6 , mmW repeater  140  may receive the configuration for the HF interface of mmW repeater  140  and, as shown by reference number  620 , may configure the HF interface of mmW repeater  140  based at least in part on the configuration. In some aspects, mmW repeater  140  may receive the configuration via the LF interface after mmW repeater  140  transmits the information associated with the HF interface via the LF interface. 
     In some aspects, mmW repeater  140  may communicate via the HF interface based at least in part on configuration. For example, mmW repeater  140  may communicate with base station  110  and/or another wireless node via the HF interface in accordance with the configuration. In some aspects, base station  110  may communication with a wireless node (e.g., another base station, a UE  120 , and/or the like) via mmW repeater  140  and using the second interface. For example, base station  110  may provide a communication to mmW repeater  140 , and mmW repeater  140  may forward the communication to the other wireless node via the HF interface of mmW repeater  140 . As another example, the other wireless node may provide a communication to mmW repeater  140 , and mmW repeater  140  may forward the communication to base station  110  via the HF interface of mmW repeater  140 . 
     As indicated above,  FIG. 6  is provided as an example. Other examples may differ from what is described with respect to  FIG. 6 . 
       FIG. 7  is a diagram illustrating an example process  700  performed, for example, by a base station, in accordance with various aspects of the present disclosure. Example process  700  is an example where a base station (e.g., base station  110 ) performs operations associated with a control plane of a repeater (e.g., mmW repeater  140 ). 
     As shown in  FIG. 7 , in some aspects, process  700  may include receiving, via a first interface of a repeater, information associated with a second interface of the repeater, the second interface being different from the first interface (block  710 ). For example, the base station (e.g., antenna  234 , receive processor  238 , controller/processor  240 , and/or the like) may receive, via a first interface of a repeater, information associated with a second interface of the repeater, as described above. In some aspects, the second interface may be different from the first interface. For example, the second interface may be an HF interface and the first interface may be an LF interface, in some aspects. In some aspects, the second interface and the first interface may be different interfaces, but may be the same in terms of frequency. For example, the second interface may be an interface used for relaying a signal and the first interface may be a control interface, where the interface used for relaying the signal and the control interface operate in the same frequency band. 
     As further shown in  FIG. 7 , in some aspects, process  700  may include determining a configuration for the second interface of the repeater based at least in part on the information associated with the HF interface (block  720 ). For example, the base station (e.g., using controller/processor  240 , memory  242 , and/or the like) may determine a configuration for the second interface of the repeater based at least in part on the information associated with the HF interface, as described above. 
     As further shown in  FIG. 7 , in some aspects, process  700  may include communicating the configuration for the second interface of the repeater via the first interface of the repeater (block  730 ). For example, the base station (e.g., using antenna  234 , transmit processor  220 , controller/processor  240 , memory  242 , and/or the like) may communicate the configuration for the second interface of the repeater via the first interface of the repeater, as described above. 
     Process  700  may include additional aspects, such as any single implementation or any combination of aspects described below and/or in connection with one or more other processes described elsewhere herein. 
     In a first aspect, the first interface is a low frequency interface and the second interface is a millimeter wave interface. 
     In a second aspect, alone or in combination with the first aspect, the base station may transmit, to the repeater, a request for the information associated with the second interface of the repeater. 
     In a third aspect, alone or in combination with one or more of the first and second aspects, the base station may establish a connection with the repeater via the first interface. 
     In a fourth aspect, alone or in combination with one or more of the first through third aspects, the base station may communicate with the repeater via the second interface based at least in part on the configuration. 
     In a fifth aspect, alone or in combination with one or more of the first through fourth aspects, the base station may communicate with a wireless node via the repeater and using the second interface. 
     In a sixth aspect, alone or in combination with one or more of the first through fifth aspects, the information associated with the second interface includes information associated with at least one of: a capability associated with the second interface of the repeater, a configuration of the second interface of the repeater, an architecture of the second interface of the repeater, or some combination thereof. 
     In a seventh aspect, alone or in combination with one or more of the first through sixth aspects, the information associated with the second interface of the repeater includes information that identifies one or more components of the second interface of the repeater and capability information associated with the one or more components of the second interface of the repeater. 
     In an eighth aspect, alone or in combination with one or more of the first through seventh aspects, the information associated with the second interface of the repeater includes information that describes interconnection of two or more components of the second interface of the repeater. 
     In a ninth aspect, alone or in combination with one or more of the first through eighth aspects, the information associated with the second interface of the repeater includes information that describes a beamforming configuration associated with the second interface of the repeater. 
     In a tenth aspect, alone or in combination with one or more of the first through ninth aspects, the configuration includes information associated with at least one of: powering on one or more components of the second interface of the repeater, powering off one or more components of the second interface of the repeater, setting a gain of a power amplifier, a transmit beam beamforming configuration, a receive beam beamforming configuration, measuring receive power on a given antenna of the second interface of the repeater, generating or transmitting a signal using the second interface of the repeater, performing beam sweeping, a set of time-domain resources on which to apply the configuration, or some combination thereof. 
     In an eleventh aspect, alone or in combination with one or more of the first through tenth aspects, a control command, associated with the configuration, includes a set of control fields including at least one of: a timing configuration field, a beamforming configuration field, a power configuration field, an operating mode field, or some combination thereof. 
     In a twelfth aspect, alone or in combination with one or more of the first through eleventh aspects, the configuration indicates an active setting associated with the second interface of the repeater. 
     In a thirteenth aspect, alone or in combination with one or more of the first through twelfth aspects, the configuration indicates a passive setting associated with the second interface of the repeater, the passive setting including one or more sets of configurations capable of being activated at a later time. 
     In a fourteenth aspect, alone or in combination with one or more of the first through thirteenth aspects, the configuration is used to semi-statically configure a first parameter associated with the second interface and to dynamically configure a second parameter associated with the second interface. 
     Although  FIG. 7  shows example blocks of process  700 , in some aspects, process  700  may include additional blocks, fewer blocks, different blocks, or differently arranged blocks than those depicted in  FIG. 7 . Additionally, or alternatively, two or more of the blocks of process  700  may be performed in parallel. 
       FIG. 8  is a diagram illustrating an example process  800  performed, for example, by a repeater, in accordance with various aspects of the present disclosure. Example process  800  is an example where a repeater (e.g., mmW repeater  140 ) performs operations associated with a control plane of the repeater. 
     As shown in  FIG. 8 , in some aspects, process  800  may include transmitting, to a base station via a first interface, information associated with a second interface, the second interface being different from the first interface (block  810 ). For example, the repeater (e.g., using controller  530 , communication component  540 , and/or the like) may transmit, to a base station via a first interface, information associated with the HF interface, as described above. In some aspects, the second interface may be different from the first interface. For example, the second interface may be an HF interface and the first interface may be an LF interface, in some aspects. In some aspects, the second interface and the first interface may be different interfaces, but may be the same in terms of frequency. For example, the second interface may be an interface used for relaying a signal and the first interface may be a control interface, where the interface used for relaying the signal and the control interface operate in the same frequency band. 
     As further shown in  FIG. 8 , in some aspects, process  800  may include receiving, via the first interface and after transmitting the information associated with the HF interface, a configuration for the second interface (block  820 ). For example, the repeater (e.g., controller  530 , communication component  540 , and/or the like) may receive, via the first interface and after transmitting the information associated with the HF interface, a configuration for the second interface, as described above. 
     As further shown in  FIG. 8 , in some aspects, process  800  may include configuring the second interface based at least in part on the configuration (block  830 ). For example, the repeater (e.g., using controller  530 ) may configure the second interface based at least in part on the configuration, as described above. 
     Process  800  may include additional aspects, such as any single implementation or any combination of aspects described below and/or in connection with one or more other processes described elsewhere herein. 
     In a first aspect, the first interface is a low frequency interface and the second interface is a millimeter wave interface. 
     In a second aspect, alone or in combination with the first aspect, the repeater may receive, from the base station, a request for the information associated with the second interface. 
     In a third aspect, alone or in combination with one or more of the first and second aspects, the repeater may establish a connection with the base station via the first interface. 
     In a fourth aspect, alone or in combination with one or more of the first through third aspects, the repeater may communicate via the second interface based at least in part on the configuration. 
     In a fifth aspect, alone or in combination with one or more of the first through fourth aspects, the information associated with the second interface includes information associated with at least one of: a capability associated with the second interface, a configuration of the second interface, an architecture of the second interface, or some combination thereof. 
     In a sixth aspect, alone or in combination with one or more of the first through fifth aspects, the information associated with the second interface includes information that identifies one or more components of the second interface and capability information associated with the one or more components of the second interface. 
     In a seventh aspect, alone or in combination with one or more of the first through sixth aspects, the information associated with the second interface includes information that describes interconnection of two or more components of the second interface. 
     In an eighth aspect, alone or in combination with one or more of the first through seventh aspects, the information associated with the second interface includes information that describes a beamforming configuration associated with the second interface. 
     In a ninth aspect, alone or in combination with one or more of the first through eighth aspects, the configuration includes information associated with at least one of: powering on one or more components of the second interface, powering off one or more components of the second interface, setting a gain of a power amplifier, a transmit beam beamforming configuration, a receive beam beamforming configuration, measuring receive power on a given antenna of the second interface, generating or transmitting a signal using the second interface, performing beam sweeping, a set of time-domain resources on which to apply the configuration, or some combination thereof. 
     In a tenth aspect, alone or in combination with one or more of the first through ninth aspects, a control command, associated with the configuration, includes a set of control fields including at least one of: a timing configuration field, beamforming configuration field, a power configuration field, an operating mode field, or some combination thereof. 
     In an eleventh aspect, alone or in combination with one or more of the first through tenth aspects, the configuration indicates an active setting associated with the second interface. 
     In a twelfth aspect, alone or in combination with one or more of the first through eleventh aspects, the configuration indicates a passive setting associated with the second interface, the passive setting including one or more sets of configurations capable of being activated at a later time. 
     In a thirteenth aspect, alone or in combination with one or more of the first through twelfth aspects, the configuration is used to semi-statically configure a first parameter associated with the second interface and to dynamically configure a second parameter associated with the second interface. 
     Although  FIG. 8  shows example blocks of process  800 , in some aspects, process  800  may include additional blocks, fewer blocks, different blocks, or differently arranged blocks than those depicted in  FIG. 8 . Additionally, or alternatively, two or more of the blocks of process  800  may be performed in parallel. 
     The foregoing disclosure provides illustration and description, but is not intended to be exhaustive or to limit the aspects to the precise form disclosed. Modifications and variations may be made in light of the above disclosure or may be acquired from practice of the aspects. 
     As used herein, the term “component” is intended to be broadly construed as hardware, firmware, or a combination of hardware and software. As used herein, a processor is implemented in hardware, firmware, or a combination of hardware and software. 
     Some aspects are described herein in connection with thresholds. As used herein, satisfying a threshold may refer to a value being greater than the threshold, greater than or equal to the threshold, less than the threshold, less than or equal to the threshold, equal to the threshold, not equal to the threshold, and/or the like. 
     It will be apparent that systems and/or methods described herein may be implemented in different forms of hardware, firmware, or a combination of hardware and software. The actual specialized control hardware or software code used to implement these systems and/or methods is not limiting of the aspects. Thus, the operation and behavior of the systems and/or methods were described herein without reference to specific software code—it being understood that software and hardware can be designed to implement the systems and/or methods based, at least in part, on the description herein. 
     Even though particular combinations of features are recited in the claims and/or disclosed in the specification, these combinations are not intended to limit the disclosure of various aspects. In fact, many of these features may be combined in ways not specifically recited in the claims and/or disclosed in the specification. Although each dependent claim listed below may directly depend on only one claim, the disclosure of various aspects includes each dependent claim in combination with every other claim in the claim set. A phrase referring to “at least one of” a list of items refers to any combination of those items, including single members. As an example, “at least one of: a, b, or c” is intended to cover a, b, c, a-b, a-c, b-c, and a-b-c, as well as any combination with multiples of the same element (e.g., a-a, a-a-a, a-a-b, a-a-c, a-b-b, a-c-c, b-b, b-b-b, b-b-c, c-c, and c-c-c or any other ordering of a, b, and c). 
     No element, act, or instruction used herein should be construed as critical or essential unless explicitly described as such. Also, as used herein, the articles “a” and “an” are intended to include one or more items, and may be used interchangeably with “one or more.” Furthermore, as used herein, the terms “set” and “group” are intended to include one or more items (e.g., related items, unrelated items, a combination of related and unrelated items, and/or the like), and may be used interchangeably with “one or more.” Where only one item is intended, the phrase “only one” or similar language is used. Also, as used herein, the terms “has,” “have,” “having,” and/or the like are intended to be open-ended terms. Further, the phrase “based on” is intended to mean “based, at least in part, on” unless explicitly stated otherwise.