WO2021189063A1

WO2021189063A1 - Beam management for mobile device clock synchronization

Info

Publication number: WO2021189063A1
Application number: PCT/US2021/070126
Authority: WO
Inventors: Jingchao Bao; Sony Akkarakaran; Xiaoxia Zhang; Alexandros MANOLAKOS; Yih-Hao Lin; Lorenzo Ferrari
Original assignee: Qualcomm Inc
Current assignee: Qualcomm Inc
Priority date: 2020-03-20
Filing date: 2021-02-04
Publication date: 2021-09-23
Anticipated expiration: 2022-09-20

Abstract

Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a first wireless node may identify a group of beams for a set of round-trip time (RTT) measurements of a link with at least one second wireless node, wherein the group of beams are associated with a set of common spatial filtering parameters; communicate with the at least one second wireless node to perform the set of RTT measurements using the group of beams; and synchronize a first clock of the first wireless node to at least one second clock of the at least one second wireless node based at least in part on the set of RTT measurements. Numerous other aspects are provided.

Description

BEAM MANAGEMENT FOR MOBILE DEVICE CLOCK SYNCHRONIZATION

CROSS-REFERENCE TO RELATED APPLICATION [0001] This Patent Application claims priority to Greece Patent Application No. 20200100150, filed on March 20, 2020, entitled “BEAM MANAGEMENT FOR MOBILE DEVICE CLOCK SYNCHRONIZATION,” and assigned to the assignee hereof. The disclosure of the prior Application is considered part of and is incorporated by reference into this Patent Application.

FIELD OF THE DISCLOSURE

[0002] Aspects of the present disclosure generally relate to wireless communication and to techniques and apparatuses for beam management for mobile device clock synchronization.

BACKGROUND

[0003] 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).

[0004] 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.

[0005] 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 should be applicable to other multiple access technologies and the telecommunication standards that employ these technologies.

SUMMARY

[0006] In some aspects, a method of wireless communication, performed by a first wireless node, may include identifying a group of beams for a set of round-trip time (RTT) measurements of a link with at least one second wireless node, wherein the group of beams are associated with a set of common spatial filtering parameters; communicating with the at least one second wireless node to perform the set of RTT measurements using the group of beams; and synchronizing a first clock of the first wireless node to at least one second clock of the at least one second wireless node based at least in part on the set of RTT measurements.

[0007] In some aspects, a first wireless node for wireless communication may include a memory and one or more processors operatively coupled to the memory. The memory and the one or more processors may be configured to identify a group of beams for a set of RTT measurements of a link with at least one second wireless node, wherein the group of beams are associated with a set of common spatial filtering parameters; communicate with the at least one second wireless node to perform the set of RTT measurements using the group of beams; and synchronize a first clock of the first wireless node to at least one second clock of the at least one second wireless node based at least in part on the set of RTT measurements.

[0008] 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 first wireless node, may cause the one or more processors to identify a group of beams for a set of RTT measurements of a link with at least one second wireless node, wherein the group of beams are associated with a set of common spatial filtering parameters; communicate with the at least one second wireless node to perform the set of RTT measurements using the group of beams; and synchronize a first clock of the first wireless node to at least one second clock of the at least one second wireless node based at least in part on the set of RTT measurements. [0009] In some aspects, an apparatus for wireless communication may include means for identifying a group of beams for a set of RTT measurements of a link with at least one wireless node, wherein the group of beams are associated with a set of common spatial filtering parameters; means for communicating with the at least one wireless node to perform the set of RTT measurements using the group of beams; and means for synchronizing a first clock of the apparatus to at least one second clock of the at least one wireless node based at least in part on the set of RTT measurements.

[0010] Aspects generally include a method, apparatus, system, computer program product, non-transitory computer-readable medium, user equipment, base station, wireless communication device, and/or processing system as substantially described herein with reference to and as illustrated by the drawings and specification.

[0011] 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 [0012] 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.

[0013] Fig. 1 is a block diagram conceptually illustrating an example of a wireless communication network, in accordance with various aspects of the present disclosure.

[0014] 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.

[0015] Figs. 3 A - 3C are diagrams illustrating examples of beam management for mobile device clock synchronization, in accordance with various aspects of the present disclosure. [0016] Fig. 4 is a diagram illustrating an example process performed, for example, by a wireless node, in accordance with various aspects of the present disclosure.

[0017] Fig. 5 is a block diagram illustrating an example apparatus, in accordance with various aspects of the present disclosure.

DETAILED DESCRIPTION

[0018] 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.

[0019] 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. [0020] 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.

[0021] 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 or some other wireless network, such as a 5G or NR network. The wireless network 100 may include a number of BSs 110 (shown as BS 110a, BS 110b, BS 110c, and BS 1 lOd) 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.

[0022] 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)). A BS for a macro cell may be referred to as a macro BS. A BS 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 110a may be a macro BS for a macro cell 102a, a BS 110b may be a pico BS for a pico cell 102b, and a BS 110c may be a femto BS for a femto cell 102c. 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.

[0023] In some aspects, 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 aspects, 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.

[0024] 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 1 lOd may communicate with macro BS 110a and a UE 120d in order to facilitate communication between BS 110a and UE 120d. A relay station may also be referred to as a relay BS, a relay base station, a relay, and/or the like.

[0025] 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). [0026] 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, directly or indirectly, via a wireless or wireline backhaul.

[0027] UEs 120 (e.g., 120a, 120b, 120c) 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.

[0028] 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 Intemet-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 some aspects, the processor components and the memory components may be coupled together. For example, the processor components (e.g., one or more processors) and the memory components (e.g., a memory) may be operatively coupled, communicatively coupled, electronically coupled, electrically coupled, and/or the like.

[0029] In general, any number of wireless networks may be deployed in a given geographic area. Each wireless network may support a particular radio access technology (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. [0030] In some aspects, two or more UEs 120 (e.g., shown as UE 120a and UE 120e) 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.

[0031] As indicated above, Fig. 1 is provided as an example. Other examples may differ from what is described with regard to Fig. 1.

[0032] Fig. 2 shows a block diagram of a design 200 of base station 110 and UE 120, which may be one of the base stations and one of the UEs in Fig. 1. Base station 110 may be equipped with T antennas 234a through 234t, and UE 120 may be equipped with R antennas 252a through 252r, where in general T > 1 and R > 1.

[0033] 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) 232a through 232t. 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 232a through 232t may be transmitted via T antennas 234a through 234t, respectively. According to various aspects described in more detail below, the synchronization signals can be generated with location encoding to convey additional information. [0034] At UE 120, antennas 252a through 252r may receive the downlink signals from base station 110 and/or other base stations and may provide received signals to demodulators (DEMODs) 254a through 254r, respectively. Each demodulator 254 may condition (e.g., fdter, 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 254a through 254r, 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.

[0035] 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 254a through 254r (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.

[0036] Controller/processor 240 of base station 110, controller/processor 280 of UE 120, and/or any other component(s) of Fig. 2 may perform one or more techniques associated with beam management for mobile device clock synchronization, as described in more detail elsewhere herein. For example, controller/processor 240 of base station 110, controller/processor 280 of UE 120, and/or any other component s) of Fig. 2 may perform or direct operations of, for example, process 400 of Fig. 4 and/or other processes as described herein. Memories 242 and 282 may store data and program codes for base station 110 and UE 120, respectively. In some aspects, memory 242 and/or memory 282 may comprise a non- transitory computer-readable medium storing one or more instructions for wireless communication. For example, the one or more instructions, when executed (e.g., directly, or after compiling, converting, interpreting, and/or the like) by one or more processors of the base station 110 and/or the UE 120, may perform or direct operations of, for example, process 400 of Fig. 4 and/or other processes as described herein. In some aspects, executing instructions may include running the instructions, converting the instructions, compiling the instructions, interpreting the instructions, and/or the like. A scheduler 246 may schedule UEs for data transmission on the downlink and/or uplink.

[0037] In some aspects, a wireless node, such as BS 110, UE 120, and/or the like may include means for identifying a group of beams for a set of round-trip time (RTT) measurements of a link with at least one second wireless node, wherein the group of beams are associated with a set of common spatial filtering parameters, means for communicating with the at least one second wireless node to perform the set of RTT measurements using the group of beams, means for synchronizing a first clock of the first wireless node to at least one second clock of the at least one second wireless node based at least in part on the set of RTT measurements, and/or the like. In some aspects, such means may include one or more components of UE 120 described in connection with Fig. 2, such as controller/processor 280, transmit processor 264, TX MIMO processor 266, MOD 254, antenna 252, DEMOD 254, MIMO detector 256, receive processor 258, and/or the like. In some aspects, such means may include one or more components of BS 110 described in connection with Fig. 2, such as antenna 234, DEMOD 232, MIMO detector 236, receive processor 238, controller/processor 240, transmit processor 220, TX MIMO processor 230, MOD 232, antenna 234, and/or the like.

[0038] As indicated above, Fig. 2 is provided as an example. Other examples may differ from what is described with regard to Fig. 2.

[0039] In some communications systems, clock synchronization may be used for synchronized communication, synchronized device control, and/or the like. Some wireless communication devices may include a global positioning system (GPS) clock to enable clock synchronization. However, other wireless communication devices may lack a GPS clock or may require a higher level of clock synchronization than is achieved using a GPS clock. For example, in machine -type -communications (MTC), precision manufacturing, controlled demolitions, and other types of use cases, precise clock synchronization may be needed. In a wired network, a wired device may use network time protocol (NTP) to achieve clock synchronization. For example, the wired device may transmit and/or receive information identifying a clock offset and/or a propagation time, from which a round-trip-time (RTT) value is determined to synchronize clocks.

[0040] However, in wireless communication, rather than a fixed path connecting a set of wired devices, a set of wireless nodes may connect via a plurality of paths. For example, wireless communication devices may communicate via a line-of-sight (LOS) path, a set of non- line-of-sight (NLOS) paths, and/or the like. To determine a propagation time for achieving clock synchronization when a plurality of paths are possible, a wireless node may match a power delay profde (PDP) for a link to and a link from another wireless node, ensure that a PDP measurement is performed using a link with a threshold link capacity or quality (e.g., a threshold signal strength, bandwidth, reference signal received power, signal to interference noise ratio, signal to noise ratio, link capacity, and/or the like), and/or the like.

[0041] However, in some cases, a downlink channel and an uplink channel between wireless nodes may be non-symmetric. For example, the downlink channel may be associated with a first beam or a first spatial filter and the uplink channel may be associated with a second beam or a second spatial filter. Although some aspects are described in terms of uplink and downlink, other configurations may be possible, such as a first direction on a sidelink and a second direction on a sidelink.

[0042] In some cases, a wireless node may be in a coverage area of a plurality of other wireless nodes from which to receive information associated with synchronizing a clock. For example, a first wireless node may be connected on a first uplink and a first downlink to a second wireless node (e.g., a first TRP) and on a second uplink and a second downlink to a third wireless node (e.g., a second TRP). In this case, the first wireless node may have differing beams or spatial filters for different links with the plurality of wireless nodes (e.g., differing beams for an uplink and a downlink with the second wireless node, differing beams for an uplink and a downlink with the third wireless node, and/or the like). As a result, the first wireless node may fail to accurately synchronize clocks.

[0043] Some aspects described herein enable beam management for clock synchronization. For example, a wireless node may identify a group of beams (e.g., an uplink beam, a downlink beam, a plurality of uplink beams, a plurality of downlink beams, and/or the like) with which to communicate with one or more other wireless nodes for clock synchronization. In this case, the wireless node may configure the group of beams with a set of common spatial filtering parameters, such as a common beamforming pattern, a common peak gain, a common beam width, and/or the like. The set of common spatial filtering parameters may form a spatial filtering configuration for the wireless node.

[0044] Using beams with the set of common spatial filtering parameters the wireless node may communicate with the one or more other wireless nodes to perform RTT measurements and to determine a clock timing offset with which to synchronize respective clocks of the wireless node and the one or more other wireless nodes. The set of common spatial filtering parameters may refer to beam pairs with common spatial filtering parameters, such that communication with a first other wireless node uses a first beam pair with a first set of common spatial filtering parameters and communication with a second other wireless node uses a second beam pair with a second set of common spatial filtering parameters that may differ from the first set of common spatial filtering parameters. In this way, the wireless communication device ensures that a clock of the wireless communication device is synchronized with a higher level of accuracy relative to attempting synchronization without symmetric links for RTT measurements.

[0045] Figs. 3 A - 3C are diagrams illustrating an example of beam management for mobile device clock synchronization, in accordance with various aspects of the present disclosure. [0046] As shown in Fig. 3A, example 300 may include a wireless node 305 (e.g., a UE 120 or a BS 110) in communication with one or more other devices in a network. For example, wireless node 305 may communicate with a UE 120 via a sidelink connection. Additionally, or alternatively, wireless node 305 may communicate with one or more BSs 110. For example, wireless node 305 may communicate with a BS 110-1 via a line-of-sight (LOS) path, a non-line- of-sight (NLOS) path (e.g., via a reflection of a signal off of an object, building, geographic feature, and/or the like), and/or the like. Similarly, wireless node 305 may communicate with another BS 110-2 (e.g., via an LOS path).

[0047] Additionally, or alternatively, wireless node 305 may communicate with a timing server 310. For example, wireless node 305 may communicate with timing server 310 directly (e.g., when timing server 310 is a component of a BS 110) or indirectly (e.g., via communications with a BS 110 that is directly or indirectly connected to timing server 310 via an access network, abackhauling network, a core network, and/or the like). In some aspects, other types of devices may be possible as synchronization reference sources, such as integrated access and backhauling (IAB) nodes, central servers, serving BSs, location management functions (LMFs), and/or the like.

[0048] As shown in Fig. 3B, and by reference number 350, wireless node 305 may identify matching beam parameters for an uplink beam and a downlink beam with BS 110-2 to perform RTT measurements, PDP measurements, and/or the like. For example, wireless node 305 may identify a common set of spatial filtering parameters to receive a beam and transmit a beam. In some aspects, wireless node 305 may set a spatial filter configuration of a set of spatial filtering configurations. For example, sets of spatial filtering parameters may form spatial filtering configurations that wireless node 305 may select for receiving or transmitting a beam. In other words, a first set of values for a beamforming pattern, beam width, or peak gain, among other examples, may form a first spatial filtering configuration, and a second set of values for the beamforming pattern, beam width, or peak gain, among other examples, may form a second spatial filtering configuration. In this case, wireless node 305 may select (e.g., based at least in part on signaling, a measurement, or a stored configuration, among other examples) one of the spatial filtering configurations for use in transmission or reception.

[0049] In some aspects, the uplink beam and the downlink beam may be in different beam sets. For example, wireless node 305 may use a downlink beam in a first beam set and an uplink beam in a second beam set. In some aspects, wireless node 305 may select BS 110-2 to use as a timing reference source from a group of available timing reference sources. For example, BS 110-2 may transmit information identifying an accuracy level of a clock of BS 110-2 (e.g., which may be based at least in part on whether BS 110-2 is synchronized directly to timing server 310, or indirectly to timing server 310 via synchronization to another device that is synchronized to timing server 310). In this case, based at least in part on selecting BS 110-2, wireless node 305 may perform a synchronization procedure including communication to determine an RTT measurement, a PDP measurement, and/or the like.

[0050] In some aspects, the common set of spatial filtering parameters includes a common beamforming pattern. For example, wireless node 305 and BS 110-2 may communicate to determine a common beamforming pattern for an uplink to BS 110-2 and a downlink to wireless node 305. In this case, a first beamforming pattern on the uplink and a second beamforming pattern on the downlink may be determined to be a common beamforming pattern based at least in part on differing by less than a threshold amount. For example, wireless node 305 may determine a common set of spatial filtering parameters such that the first beamforming pattern and the second beamforming pattern differ by less than a threshold peak gain, beam width, and/or the like. Additionally, or alternatively, wireless node 305 may determine to use the same beam weighting coefficients for antenna elements used on the uplink and on the downlink. [0051] In some aspects, wireless node 305 and BS 110-2 may communicate to configure a channel on which to perform RTT measurements, PDP measurements, and/or the like. For example, wireless node 305 may transmit a control message to BS 110-2 to request use of a whole channel (e.g., a full beam sweep) or a particular group of TRP resource sets (e.g., a plurality of beam pairs to achieve partial channel observation, a single beam pair, and/or the like) for a set of PDP measurements.

[0052] In this way, based at least in part on configuring matching beams for the uplink and the downlink, wireless node 305 ensures that beams resulting from spatial filtering and radio frequency chain processing are associated with a common set of spatial properties, such as beam direction, beam width, beam shape, side-lobe, and/or the like, which enables PDP matching for clock synchronization.

[0053] As further shown in Fig. 3B, and by reference number 352, wireless node 305 and BS 110-2 may communicate in order to synchronize clocks. For example, wireless node 305 may transmit first time synchronization information with at least one beam to BS 110-2 and receive second time synchronization information with at least one beam from BS 110-2 to enable a PDP measurement, an RTT measurement, and/or the like. For example, BS 110-2 may measure an RTT value and/or a PDP measurement and report the RTT value and/or the PDP measurement to wireless node 305 to enable clock synchronization. Additionally, or alternatively, BS 110-2 and/or wireless node 305 may report an RTT value, a PDP measurement, and/or the like to timing server 310, which may, as a response, provide information indicating a timing for synchronizing a clock of wireless node 305.

[0054] As shown in Fig. 3C, and by reference number 360, wireless node 305 may identify matching beam parameters for uplink and downlink beams with a plurality of BSs 110. For example, wireless node 305 may identify BS 110-1 and BS 110-2 as timing reference sources and may identify a first set of common spatial parameter for uplink and downlink beams to BS 110-1, a second set of common spatial parameters for uplink and downlink beams to BS 110-2, and/or the like as described above. As shown by reference numbers 362 and 364, wireless node 305 may communicate with BSs 110 to synchronize a clock. For example, wireless node 305 and BSs 110 may perform a plurality of PDP measurements, RTT measurements, and/or the like. In some aspects, wireless node 305 may determine a synchronization error based at least in part on the plurality of PDP measurements, RTT measurements, and/or the like and may synchronize a clock (e.g., to a reference time of a network) based at least in part on the synchronization error. In some aspects, wireless node 305 may receive a first wave form from one or more BSs 110 and transmit a second wave form to one or more BSs 110. For example, wireless node 305 may receive or transmit a downlink or uplink paging reference signal (PRS) with a first beam and synthesize an RRT wave form based at least in part on receiving or transmitting the downlink or uplink PRS.

[0055] Additionally, or alternatively, at least one BS 110 may determine the synchronization error and may report the synchronization error to wireless node 305 to enable wireless node 305 to synchronize a clock. Additionally, or alternatively, wireless node 305 and/or BSs 110 may report the plurality of PDP measurements, RTT measurements, and/or the like to timing server 310. In this case, timing server 310 may determine a link clock time error for links within a network and may report the link clock time error to wireless node 305 to enable synchronization of a clock. Additionally, or alternatively, timing server 310 may determine a synchronization time for the network (e.g., using an optimization algorithm), and may report synchronization errors, timing offsets, and/or the like to a plurality of wireless nodes to enable the plurality of wireless nodes to synchronize respective clocks to the synchronization time.

[0056] As indicated above, Figs. 3A - 3C are provided as examples. Other examples may differ from what is described with respect to Figs. 3 A - 3C.

[0057] Fig. 4 is a diagram illustrating an example process 400 performed, for example, by a first wireless node, in accordance with various aspects of the present disclosure. Example process 400 is an example where the first wireless node (e.g., BS 110, UE 120, wireless node 305, and/or the like) performs operations associated with beam management for mobile device clock synchronization. [0058] As shown in Fig. 4, in some aspects, process 400 may include identifying a group of beams for a set of RTT measurements of a link with at least one second wireless node, wherein the group of beams are associated with a set of common spatial filtering parameters (block 410). For example, the first wireless node (e.g., using controller/processor 240, controller/processor 280, and/or the like) may identify a group of beams for a set of RTT measurements of a link with at least one second wireless node, as described above. In some aspects, the group of beams are associated with a set of common spatial filtering parameters. [0059] As further shown in Fig. 4, in some aspects, process 400 may include communicating with the at least one second wireless node to perform the set of RTT measurements using the group of beams (block 420). For example, the first wireless node (e.g., using antenna 234, DEMOD 232, MIMO detector 236, receive processor 238, controller/processor 240, transmit processor 220, TX MIMO processor 230, MOD 232, antenna 252, DEMOD 254, MIMO detector 256, receive processor 258, controller/processor 280, transmit processor 264, TX MIMO processor 266, MOD 254, and/or the like) may communicate with the at least one second wireless node to perform the set of RTT measurements using the group of beams, as described above.

[0060] As further shown in Fig. 4, in some aspects, process 400 may include synchronizing a first clock of the first wireless node to at least one second clock of the at least one second wireless node based at least in part on the set of RTT measurements (block 430). For example, the first wireless node (e.g., using controller/processor 240, controller/processor 280, and/or the like) may synchronize a first clock of the first wireless node to at least one second clock of the at least one second wireless node based at least in part on the set of RTT measurements, as described above.

[0061] Process 400 may include additional aspects, such as any single aspect or any combination of aspects described below and/or in connection with one or more other processes described elsewhere herein.

[0062] In a first aspect, communicating with the at least one second wireless node comprises: receiving a first RTT wave form from the at least one second wireless node using the group of beams, and transmitting a second RTT wave form to the at least one second wireless node using the group of beams.

[0063] In a second aspect, alone or in combination with the first aspect, the first RTT wave form and the second RTT wave form use a common spatial filtering configuration.

[0064] In a third aspect, alone or in combination with one or more of the first and second aspects, the set of common spatial filtering parameters includes a first parameter of a first beam of the group of beams and a second parameter of a second beam of the group of beams, and the first parameter and the second parameter differ by less than a threshold. [0065] In a fourth aspect, alone or in combination with one or more of the first through third aspects, the first beam is included in a first beam set and the second beam is included in a second beam set.

[0066] In a fifth aspect, alone or in combination with one or more of the first through fourth aspects, the first parameter and the second parameter are associated with a beamforming pattern and the threshold is at least one of a peak gain threshold, a beam width threshold, a boresight threshold, or a beam shape threshold.

[0067] In a sixth aspect, alone or in combination with one or more of the first through fifth aspects, the beamforming pattern includes a beam direction.

[0068] In a seventh aspect, alone or in combination with one or more of the first through sixth aspects, the set of common spatial filtering parameters includes a common set of beam weighting coefficients for a set of antenna elements of at least one of the first wireless node or the at least one second wireless node.

[0069] In an eighth aspect, alone or in combination with one or more of the first through seventh aspects, synchronizing the first clock to the second clock comprises synchronizing the first clock to the second clock based at least in part on the propagation delay.

[0070] In a ninth aspect, alone or in combination with one or more of the first through eighth aspects, synchronizing the first clock to the second clock comprises synchronizing the first clock to the second clock based at least in part on synchronization information received from the at least one second wireless node or a central timing server.

[0071] In a tenth aspect, alone or in combination with one or more of the first through ninth aspects, the synchronization information is received from the central timing server and is based at least in part on a plurality of sets of RTT measurements associated with a plurality of links. [0072] In an eleventh aspect, alone or in combination with one or more of the first through tenth aspects, the synchronization information includes information identifying a synchronization error associated with the link.

[0073] In a twelfth aspect, alone or in combination with one or more of the first through eleventh aspects, the set of common spatial filtering parameters includes a first one or more common spatial filtering parameters for communication with a first node of the at least one second wireless node and a second one or more common spatial filtering parameters for communication with a second node of the at least one second wireless node.

[0074] In a thirteenth aspect, alone or in combination with one or more of the first through twelfth aspects, at least one of the first wireless node or the at least one second wireless node is a base station or a UE.

[0075] Although Fig. 4 shows example blocks of process 400, in some aspects, process 400 may include additional blocks, fewer blocks, different blocks, or differently arranged blocks than those depicted in Fig. 4. Additionally, or alternatively, two or more of the blocks of process 400 may be performed in parallel.

[0076] Fig. 5 is a block diagram of an example apparatus 500 for wireless communication. The apparatus 500 may be a first wireless node, or a first wireless node may include the apparatus 500. In some aspects, the apparatus 500 includes a reception component 502 and a transmission component 504, which may be in communication with one another (for example, via one or more buses and/or one or more other components). As shown, the apparatus 500 may communicate with another apparatus 506 (a second wireless node, such as a UE, a base station, or another wireless communication device) using the reception component 502 and the transmission component 504. As further shown, the apparatus 500 may include one or more of a beam identification component 508 or a clock synchronization component 510, among other examples.

[0077] In some aspects, the apparatus 500 may be configured to perform one or more operations described herein in connection with Figs. 3A-3C. Additionally, or alternatively, the apparatus 500 may be configured to perform one or more processes described herein, such as process 400 of Fig. 4, among other examples. In some aspects, the apparatus 500 and/or one or more components shown in Fig. 5 may include one or more components of the first wireless node described above in connection with Fig. 2. Additionally, or alternatively, one or more components shown in Fig. 5 may be implemented within one or more components described above in connection with Fig. 2. Additionally, or alternatively, one or more components of the set of components may be implemented at least in part as software stored in a memory. For example, a component (or a portion of a component) may be implemented as instructions or code stored in a non-transitory computer-readable medium and executable by a controller or a processor to perform the functions or operations of the component.

[0078] The reception component 502 may receive communications, such as reference signals, control information, data communications, or a combination thereof, from the apparatus 506. The reception component 502 may provide received communications to one or more other components of the apparatus 500. In some aspects, the reception component 502 may perform signal processing on the received communications (such as filtering, amplification, demodulation, analog-to-digital conversion, demultiplexing, deinterleaving, de-mapping, equalization, interference cancellation, or decoding, among other examples), and may provide the processed signals to the one or more other components of the apparatus 506. In some aspects, the reception component 502 may include one or more antennas, a demodulator, a MIMO detector, a receive processor, a controller/processor, a memory, or a combination thereof, of the first wireless node described above in connection with Fig. 2.

[0079] The transmission component 504 may transmit communications, such as reference signals, control information, data communications, or a combination thereof, to the apparatus 506. In some aspects, one or more other components of the apparatus 506 may generate communications and may provide the generated communications to the transmission component 504 for transmission to the apparatus 506. In some aspects, the transmission component 504 may perform signal processing on the generated communications (such as filtering, amplification, modulation, digital-to-analog conversion, multiplexing, interleaving, mapping, or encoding, among other examples), and may transmit the processed signals to the apparatus 506. In some aspects, the transmission component 504 may include one or more antennas, a modulator, a transmit MIMO processor, a transmit processor, a controller/processor, a memory, or a combination thereof, of the first wireless node described above in connection with Fig. 2.

In some aspects, the transmission component 504 may be co-located with the reception component 502 in a transceiver.

[0080] The beam identification component 508 may identify a group of beams for a set of round-trip time (RTT) measurements of a link with at least one second wireless node, wherein the group of beams are associated with a set of common spatial filtering parameters. The reception component 502 and/or the transmission component 504 may communicate with the apparatus 506 to perform the set of RTT measurements using the group of beams. The clock synchronization component 510 may synchronize a first clock of the first wireless node to at least one second clock of the at least one second wireless node based at least in part on the set of RTT measurements. The clock synchronization component 510 may determine a propagation delay associated with the link with the apparatus 506 based at least in part on the set of RTT measurements. The transmission component 504 may report the set of RTT measurements to at least one of the apparatus 506 (e.g., at least one second wireless node or a central timing server). [0081] The number and arrangement of components shown in Fig. 5 are provided as an example. In practice, there may be additional components, fewer components, different components, or differently arranged components than those shown in Fig. 5. Furthermore, two or more components shown in Fig. 5 may be implemented within a single component, or a single component shown in Fig. 5 may be implemented as multiple, distributed components. Additionally, or alternatively, a set of (one or more) components shown in Fig. 5 may perform one or more functions described as being performed by another set of components shown in Fig. 5.

[0082] The following provides an overview of aspects of the present disclosure:

[0083] Aspect 1 : A method of wireless communication performed by a first wireless node, comprising: identifying a group of beams for a set of round-trip time (RTT) measurements of a link with at least one second wireless node, wherein the group of beams are associated with a set of common spatial filtering parameters; communicating with the at least one second wireless node to perform the set of RTT measurements using the group of beams; and synchronizing a first clock of the first wireless node to at least one second clock of the at least one second wireless node based at least in part on the set of RTT measurements.

[0084] Aspect 2: The method of aspect 1, wherein the set of common spatial filtering parameters includes a first one or more common spatial filtering parameters for communication with a first node of the at least one second wireless node and a second one or more common spatial filtering parameters for communication with a second node of the at least one second wireless node.

[0085] Aspect 3 : The method of any of aspects 1 to 2, wherein communicating with the at least one second wireless node comprises: receiving a first RTT wave form from the at least one second wireless node using the group of beams; and transmitting a second RTT wave form to the at least one second wireless node using the group of beams.

[0086] Aspect 4: The method of aspect 3, wherein the first RTT wave form and the second RTT wave form use a common spatial filtering configuration.

[0087] Aspect 5 : The method of any of aspects 1 to 4, wherein the set of common spatial filtering parameters includes a first parameter of a first beam of the group of beams and a second parameter of a second beam of the group of beams, and wherein the first parameter and the second parameter differ by less than a threshold.

[0088] Aspect 6: The method of aspect 5, wherein the first beam is included in a first beam set and the second beam is included in a second beam set.

[0089] Aspect 7 : The method of any of aspects 5 to 6, wherein the first parameter and the second parameter are associated with a beamforming pattern and the threshold is at least one of a peak gain threshold, a beam width threshold, a boresight threshold, or a beam shape threshold. [0090] Aspect 8: The method of aspect 7, wherein the beamforming pattern includes a beam direction.

[0091] Aspect 9: The method of any of aspects 1 to 8, wherein the set of common spatial filtering parameters includes a common set of beam weighting coefficients for a set of antenna elements of at least one of the first wireless node or the at least one second wireless node. [0092] Aspect 10: The method of any of aspects 1 to 9, further comprising: determining a propagation delay associated with the link with the at least one second wireless node based at least in part on the set of RTT measurements; and wherein synchronizing the first clock to the second clock comprises: synchronizing the first clock to the second clock based at least in part on the propagation delay, wherein synchronizing the first clock to the second clock comprises: synchronizing the first clock to the second clock based at least in part on the propagation delay. [0093] Aspect 11: The method of any of aspects 1 to 10, further comprising: reporting the set of RTT measurements to at least one of the at least one second wireless node or a central timing server; and wherein synchronizing the first clock to the second clock comprises: synchronizing the first clock to the second clock based at least in part on synchronization information received from the at least one second wireless node or the central timing server, wherein synchronizing the first clock to the second clock comprises: synchronizing the first clock to the second clock based at least in part on synchronization information received from the at least one second wireless node or the central timing server.

[0094] Aspect 12: The method of aspect 11, wherein the synchronization information is received from the central timing server and is based at least in part on a plurality of sets of RTT measurements associated with a plurality of links.

[0095] Aspect 13: The method of any of aspects 11 to 12, wherein the synchronization information includes information identifying a synchronization error associated with the link. [0096] Aspect 14: An apparatus for wireless communication at a device, comprising a processor; memory coupled with the processor; and instructions stored in the memory and executable by the processor to cause the apparatus to perform the method of one or more aspects of aspects 1-13.

[0097] Aspect 15: A device for wireless communication, comprising a memory and one or more processors coupled to the memory, the memory and the one or more processors configured to perform the method of one or more aspects of aspects 1-13.

[0098] Aspect 16: An apparatus for wireless communication, comprising at least one means for performing the method of one or more aspects of aspects 1-13.

[0099] Aspect 17: A non-transitory computer-readable medium storing code for wireless communication, the code comprising instructions executable by a processor to perform the method of one or more aspects of aspects 1-13.

[00100] Aspect 18: A non-transitory computer-readable medium storing a set of instructions for wireless communication, the set of instructions comprising one or more instructions that, when executed by one or more processors of a device, cause the device to perform the method of one or more aspects of aspects 1-13.

[00101] 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. [00102] As used herein, the term “component” is intended to be broadly construed as hardware, firmware, and/or a combination of hardware and software. As used herein, a processor is implemented in hardware, firmware, and/or a combination of hardware and software.

[00103] As used herein, satisfying a threshold may, depending on the context, 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.

[00104] It will be apparent that systems and/or methods described herein may be implemented in different forms of hardware, firmware, and/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.

[00105] 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).

[00106] 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.

Claims

WHAT IS CLAIMED IS:

1. A first wireless node for wireless communication, comprising: a memory; and one or more processors operatively coupled to the memory, the memory and the one or more processors configured to: identify a group of beams for a set of round-trip time (RTT) measurements of a link with at least one second wireless node, wherein the group of beams are associated with a set of common spatial filtering parameters; communicate with the at least one second wireless node to perform the set of RTT measurements using the group of beams; and synchronize a first clock of the first wireless node to at least one second clock of the at least one second wireless node based at least in part on the set of RTT measurements.

2. The first wireless node of claim 1, wherein the set of common spatial filtering parameters includes a first one or more common spatial filtering parameters for communication with a first node of the at least one second wireless node and a second one or more common spatial filtering parameters for communication with a second node of the at least one second wireless node.

3. The first wireless node of claim 1, wherein the one or more processors, when communicating with the at least one second wireless node, are configured to: receive a first RTT wave form from the at least one second wireless node using the group of beams; and transmit a second RTT wave form to the at least one second wireless node using the group of beams.

4. The first wireless node of claim 3, wherein the first RTT wave form and the second RTT wave form use a common spatial filtering configuration.

5. The first wireless node of claim 1, wherein the set of common spatial filtering parameters includes a first parameter of a first beam of the group of beams and a second parameter of a second beam of the group of beams, and wherein the first parameter and the second parameter differ by less than a threshold.

6. The first wireless node of claim 5, wherein the first beam is included in a first beam set and the second beam is included in a second beam set.

7. The first wireless node of claim 5, wherein the first parameter and the second parameter are associated with a beamforming pattern and the threshold is at least one of a peak gain threshold, a beam width threshold, a boresight threshold, or a beam shape threshold.

8. The first wireless node of claim 7, wherein the beamforming pattern includes a beam direction.

9. The first wireless node of claim 1, wherein the set of common spatial filtering parameters includes a common set of beam weighting coefficients for a set of antenna elements of at least one of the first wireless node or the at least one second wireless node.

10. The first wireless node of claim 1, wherein the one or more processors are further configured to: determine a propagation delay associated with the link with the at least one second wireless node based at least in part on the set of RTT measurements; and wherein the one or more processors, when synchronizing the first clock to the second clock, are configured to: synchronize the first clock to the second clock based at least in part on the propagation delay.

11. The first wireless node of claim 1, wherein the one or more processors are further configured to: report the set of RTT measurements to at least one of the at least one second wireless node or a central timing server; and wherein the one or more processors, when synchronizing the first clock to the second clock, are configured to: synchronize the first clock to the second clock based at least in part on synchronization information received from the at least one second wireless node or the central timing server.

12. The first wireless node of claim 11, wherein the synchronization information is received from the central timing server and is based at least in part on a plurality of sets of RTT measurements associated with a plurality of links.

13. The first wireless node of claim 11, wherein the synchronization information includes information identifying a synchronization error associated with the link.

14. The first wireless node of claim 1, wherein at least one of the first wireless node or the at least one second wireless node is a base station or a user equipment.

15. A method of wireless communication performed by a first wireless node, comprising: identifying a group of beams for a set of round-trip time (RTT) measurements of a link with at least one second wireless node, wherein the group of beams are associated with a set of common spatial filtering parameters; communicating with the at least one second wireless node to perform the set of RTT measurements using the group of beams; and synchronizing a first clock of the first wireless node to at least one second clock of the at least one second wireless node based at least in part on the set of RTT measurements.

16. The method of claim 15, wherein the set of common spatial filtering parameters includes a first one or more common spatial filtering parameters for communication with a first node of the at least one second wireless node and a second one or more common spatial filtering parameters for communication with a second node of the at least one second wireless node.

17. The method of claim 15, wherein communicating with the at least one second wireless node comprises: receiving a first RTT wave form from the at least one second wireless node using the group of beams; and transmitting a second RTT wave form to the at least one second wireless node using the group of beams.

18. The method of claim 17, wherein the first RTT wave form and the second RTT wave form use a common spatial filtering configuration.

19. The method of claim 15, wherein the set of common spatial filtering parameters includes a first parameter of a first beam of the group of beams and a second parameter of a second beam of the group of beams, and wherein the first parameter and the second parameter differ by less than a threshold.

20. The method of claim 19, wherein the first beam is included in a first beam set and the second beam is included in a second beam set.

21. The method of claim 19, wherein the first parameter and the second parameter are associated with a beamforming pattern and the threshold is at least one of a peak gain threshold, a beam width threshold, a boresight threshold, a beam shape threshold, or a combination thereof.

22. The method of claim 21, wherein the beamforming pattern includes a beam direction.

23. The method of claim 15, wherein the set of common spatial filtering parameters includes a common set of beam weighting coefficients for a set of antenna elements of at least one of the first wireless node or the at least one second wireless node.

24. The method of claim 15, further comprising: determining a propagation delay associated with the link with the at least one second wireless node based at least in part on the set of RTT measurements; and wherein synchronizing the first clock to the second clock comprises: synchronizing the first clock to the second clock based at least in part on the propagation delay.

25. The method of claim 15, further comprising: reporting the set of RTT measurements to at least one of the at least one second wireless node or a central timing server; and wherein synchronizing the first clock to the second clock comprises: synchronizing the first clock to the second clock based at least in part on synchronization information received from the at least one second wireless node or the central timing server.

26. The method of claim 25, wherein the synchronization information is received from the central timing server and is based at least in part on a plurality of sets of RTT measurements associated with a plurality of links.

27. The method of claim 25, wherein the synchronization information includes information identifying a synchronization error associated with the link.

28. The method of claim 15, wherein at least one of the first wireless node or the at least one second wireless node is a base station or a user equipment.

29. A non-transitory computer-readable medium storing a set of instructions for wireless communication, the set of instructions comprising: one or more instructions that, when executed by one or more processors of a first wireless node, cause the first wireless node to: identify a group of beams for a set of round-trip time (RTT) measurements of a link with at least one second wireless node, wherein the group of beams are associated with a set of common spatial filtering parameters; communicate with the at least one second wireless node to perform the set of RTT measurements using the group of beams; and synchronize a first clock of the first wireless node to at least one second clock of the at least one second wireless node based at least in part on the set of RTT measurements.

30. An apparatus for wireless communication, comprising: means for identifying a group of beams for a set of round-trip time (RTT) measurements of a link with at least one wireless node, wherein the group of beams are associated with a set of common spatial filtering parameters; means for communicating with the at least one wireless node to perform the set of RTT measurements using the group of beams; and means for synchronizing a first clock of the apparatus to at least one second clock of the at least one wireless node based at least in part on the set of RTT measurements.