Beam-based random access occasion

Abstract

Various aspects of the present disclosure generally relate to wireless communication. In certain aspects, a user equipment (UE) can receive, from a base station, a message indicating a plurality of subsets within a set of random access occasions. Each of the plurality of subsets can be associated with a corresponding beam of a plurality of beams, and each corresponding beam can be different from a remaining beam of the plurality of beams. Accordingly, the UE can transmit, to the base station, at least one random access preamble based at least in part on the message. The at least one random access preamble is transmitted within one or more of the plurality of subsets using one or more corresponding beams of the plurality of beams. Numerous other aspects are described.

Description

[0001] Cross-references to related applications

[0002] This patent application claims priority to U.S. Provisional Patent Application No. 63 / 092,734, entitled “RANDOM ACCESS OCCASIONBUNDLING,” filed October 16, 2020, and U.S. Non-Provisional Patent Application No. 17 / 450,223, entitled “BEAM-BASED RANDOM ACCESS OCCASIONS,” filed October 7, 2021, both of which are expressly incorporated herein by reference. Technical Field

[0003] Various aspects of this disclosure generally relate to wireless communications and techniques and apparatus for use with random access timing. Background Technology

[0004] Wireless communication systems are widely deployed to provide a variety of telecommunications services, such as telephone, video, data, messaging, and broadcasting. Typical wireless communication systems employ multiple access technologies that enable communication with multiple users by sharing available system resources (e.g., bandwidth, transmit power, etc.). 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 published by the 3rd Generation Partnership Project (3GPP).

[0005] A wireless network may include one or more base stations that support communication between a user equipment (UE) or multiple UEs. A UE may communicate with a base station via downlink and uplink communication. "Downlink" (or "DL") refers to the communication link from the base station to the UE, and "uplink" (or "UL") refers to the communication link from the UE to the base station.

[0006] The above multiple access technologies have been adopted in various telecommunication standards to provide a common protocol that enables different UEs to communicate on a municipal, national, regional, and / or global level. New Radio (NR), which can also be referred to as 5G, is a set of enhancements to the LTE mobile standard promulgated by the 3 GPP. 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, CP- OFDM and / or single-carrier frequency division multiplexing (SC-FDM) (also known as discrete Fourier transform spread OFDM (DFT-s-OFDM)) on the uplink, and support beamforming, multiple input multiple output (MIMO) antenna technology, and carrier aggregation. As the demand for mobile broadband access continues to increase, further improvements in LTE, NR, and other radio access technologies remain very useful. SUMMARY

[0007] Some aspects described herein relate to an apparatus for wireless communication at a user equipment (UE). The apparatus can include a memory and one or more processors coupled to the memory. The one or more processors can be configured to receive, from a base station, a message indicating a plurality of subsets within a set of random access occasions, where each subset of the plurality of subsets is associated with a corresponding beam of a plurality of beams, where each corresponding beam is different from a remaining beam of the plurality of beams. The one or more processors can be further configured to transmit, to the base station, at least one random access preamble based at least in part on the message, where the at least one random access preamble is transmitted within one or more subsets of the plurality of subsets using one or more corresponding beams of the plurality of beams.

[0008] Some aspects described herein relate to an apparatus for wireless communication at a user equipment (UE). The apparatus can include a memory and one or more processors coupled to the memory. The one or more processors can be configured to receive, from a base station, a message indicating a plurality of subsets within a set of random access occasions, where each subset of the plurality of subsets is associated with a corresponding beam of a plurality of beams, where each corresponding beam is different from a remaining beam of the plurality of beams. The one or more processors can be further configured to transmit, to the base station, at least one random access preamble based at least in part on the message, where the at least one random access preamble is transmitted within one or more subsets of the plurality of subsets using one or more corresponding beams of the plurality of beams.

[0009] Some aspects described herein relate to a method of wireless communication performed by a UE. The method can include receiving, from a base station, a message indicating a plurality of subsets within a set of random access occasions, where each subset of the plurality of subsets is associated with a corresponding beam of a plurality of beams, where each corresponding beam is different from a remaining beam of the plurality of beams. The method can also include transmitting, to the base station, at least one random access preamble based at least in part on the message, where the at least one random access preamble is transmitted within one or more subsets of the plurality of subsets using one or more corresponding beams of the plurality of beams.

[0010] Some aspects described herein relate to a method of wireless communication performed by a base station. The method can include transmitting, to a UE, a message indicating a plurality of subsets within a set of random access occasions, where each subset of the plurality of subsets is associated with a corresponding beam of a plurality of beams, where each corresponding beam is different from a remaining beam of the plurality of beams. The method can also include receiving, from the UE, at least one random access preamble based at least in part on the message, where the at least one random access preamble is received within one or more subsets of the plurality of subsets using one or more corresponding beams of the plurality of beams.

[0011] Some aspects described herein relate to a non-transitory computer-readable medium storing a set of instructions for wireless communication by a UE. When executed by one or more processors of the UE, the set of instructions can cause the UE to receive, from a base station, a message indicating a plurality of subsets within a set of random access occasions, where each subset of the plurality of subsets is associated with a corresponding beam of a plurality of beams, where each corresponding beam is different from a remaining beam of the plurality of beams. When executed by the one or more processors of the UE, the set of instructions can also cause the UE to transmit, to the base station, at least one random access preamble based at least in part on the message, where the at least one random access preamble is transmitted within one or more subsets of the plurality of subsets using one or more corresponding beams of the plurality of beams.

[0012] Some aspects described herein relate to a non-transitory computer-readable medium storing a set of instructions for wireless communication by a base station. When executed by one or more processors of the base station, the set of instructions can cause the base station to transmit, to a UE, a message indicating a plurality of subsets within a set of random access occasions, where each subset of the plurality of subsets is associated with a corresponding beam of a plurality of beams, where each corresponding beam is different from a remaining beam of the plurality of beams. When executed by the one or more processors of the base station, the set of instructions can also cause the base station to receive, from the UE, at least one random access preamble based at least in part on the message, where the at least one random access preamble is received within one or more subsets of the plurality of subsets using one or more corresponding beams of the plurality of beams.

[0013] Some aspects described herein relate to an apparatus for wireless communication. The apparatus can include means for receiving, from a base station, a message indicating a plurality of subsets within a set of random access occasions, where each subset of the plurality of subsets is associated with a corresponding beam of a plurality of beams, where each corresponding beam is different from a remaining beam of the plurality of beams. The apparatus can also include means for transmitting, to the base station, at least one random access preamble based at least in part on the message, where the at least one random access preamble is transmitted within one or more subsets of the plurality of subsets using one or more corresponding beams of the plurality of beams.

[0014] Some aspects described herein relate to an apparatus for wireless communication. The apparatus can include means for receiving, from a base station, a message indicating a plurality of subsets within a set of random access occasions, where each subset of the plurality of subsets is associated with a corresponding beam of a plurality of beams, where each corresponding beam is different from a remaining beam of the plurality of beams. The apparatus can also include means for transmitting, to the base station, at least one random access preamble based at least in part on the message, where the at least one random access preamble is transmitted within one or more subsets of the plurality of subsets using one or more corresponding beams of the plurality of beams.

[0015] 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.

[0016] 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 can be better understood. Additional features and advantages will be described hereinafter. The disclosed concepts and specific examples can be readily utilized as bases for modifying or designing other for carrying the same purposes thereof. Such equivalent constructions not only follow from the scope of the appended claims, but are intended to be falling within the scope and range of equivalents. The particulars shown herein are by way of example and for purposes of illustrative, not limitation, as the scope of the concepts disclosed herein are best understood by a reading of the description when considered in connection with the figures. Each figure is provided for the intent and purpose of illustration and description and not limitation.

[0017] While aspects are described in the disclosure by illustration of some examples, those skilled in the art will understand that these aspects can be practiced in many different arrangements and scenarios. The technology described herein can be implemented using different platform types, devices, systems, shapes, sizes, and / or packaging arrangements. For example, some aspects can be implemented via integrated chip embodiments, or other non-module-component based devices (e.g., end-user devices, vehicles, communication devices, computing devices, industrial devices, retail / purchasing devices, medical devices, and / or artificial intelligence devices). Aspects can be implemented in chip-level components, modular components, non-modular components, non-chip-level components, device-level components, and / or system-level components. Devices incorporating the described aspects and features can include additional components and features for implementation and practice of the claimed and described aspects. For example, transmission and reception of wireless signals can include one or more components for analog and digital purposes (e.g., hardware components including antennas, radio frequency (RF) chains, power amplifiers, modulators, buffers, processors, interleaves, adders). It is intended that aspects described herein can be practiced in a wide variety of different devices, components, systems, distributed arrangements, and / or end-user devices of varying size, shape, and constitution. BRIEF DESCRIPTION OF DRAWINGS

[0018] In order to provide a detailed understanding of the above-mentioned features of the present disclosure, a more particular description will be rendered by reference to certain aspects, which are illustrated in the appended drawings. It is to be noted, however, that the appended drawings represent illustrative aspects only and are not intended to be limiting, inasmuch as the description can admit to other equally effective aspects. Like reference numerals can be used throughout the several views to designate like components.

[0019] Figure 1 FIG. 1 is a diagram illustrating an example of a wireless network according to the present disclosure.

[0020] Figure 2 FIG. 2 is a diagram illustrating an example of a base station in communication with a user equipment (UE) in a wireless network according to the present disclosure.

[0021] Figure 3 FIG. 3 is a diagram illustrating an example of a beamforming architecture that supports beamforming for millimeter wave (mmW) communications according to the present disclosure.

[0022] Figure 4 FIG. 4 is a diagram illustrating an example of a synchronization signal (SS) hierarchy according to the present disclosure.

[0023] Figure 5 FIG. 5 is a diagram illustrating an example of a four-step random access procedure according to the present disclosure.

[0024] Figure 6 FIG. 6 is a diagram illustrating an example of a two-step random access procedure according to the present disclosure. Figure 7FIG. 1 is a diagram illustrating an example of a random access occasion bundle, in accordance with the present disclosure.

[0025] Figure 8 and Figure 9 FIG. 2 is a diagram illustrating an example process associated with a random access occasion bundle, in accordance with the present disclosure.

[0026] Figure 10 and Figure 11 FIG. 3 is a diagram of an example apparatus for wireless communication, in accordance with the present disclosure. DETAILED DESCRIPTION

[0027] Aspects of the present disclosure will now be described with reference to the drawings. However, the present disclosure can be implemented in numerous different forms, and should not be construed as limited to any particular structure or function presented throughout this disclosure. Rather, these aspects are provided as illustrative examples so as to disclose sufficient information for practicing the present disclosure. Persons skilled in the art will recognize that the present disclosure is to be

[0028] Several aspects of telecommunication systems will now be presented with reference to various apparatus and methods. These apparatus and methods will be described in the following detailed description and illustrated in the accompanying drawings by various blocks, modules, components, circuits, steps, processes, algorithms, etc. (collectively referred to as “elements”). These elements can be implemented using hardware, software, or combinations thereof. Whether such elements are implemented as hardware or software depends on the particular application and design constraints imposed on the overall system.

[0029] While aspects can be described herein using terminology commonly associated with a 5G or New Radio (NR) wireless access technology (RAT), aspects of the present disclosure can be applied to other RATs, such as a 3G RAT, a 4G RAT, and / or a post-5G RAT (e.g., 6G).

[0030] Figure 1is a diagram illustrating an example of a wireless network 100, in accordance with the present disclosure. Wireless network 100 can be or include elements of a 5G (e.g., NR) network and / or a 4G (e.g., Long Term Evolution (LTE)) network, among other examples. Wireless network 100 can include one or more base stations 110 (shown as BS 110a, BS 110b, BS 110c, and BS 1 lOd), user equipment (UE) 120 or multiple UEs 120 (shown as UE 120a, UE 120b, UE 120c, UE 120d, and UE 120e), and / or other network entities. A base station 110 is an entity that communicates with UEs 120. Base stations 110 (sometimes referred to as BSs) can include, for example, NR base stations, LTE base stations, NodeBs, eNBs (e.g., in 4G), gNBs (e.g., in 5G), access points, and / or transmission reception points (TRPs). Each base station 110 can provide communication coverage for a particular geographic area. In Third Generation Partnership Project (3GPP), the term “cell” can refer to a coverage area of a base station 110 and / or a subsystem of a base station 110 that serves the coverage area, depending on the context in which the term is used.

[0031] Base stations 110 can provide communication coverage for macro cells, small cells, femtocells, and / or other types of cells. A macro cell can cover a relatively large geographic area (e.g., 5 kilometers in radius) and can allow unrestricted access by UEs 120 with service subscriptions. A small cell can cover a relatively small geographic area and can allow restricted access by UEs 120 having service subscriptions. Figure 1 In the example shown, BS 110a can be a macro base station for macro cell 102a, BS 110b can be a micro base station for micro cell 102b, and BS 110c can be a femto base station for femto cell 102c. Base stations can support one or multiple (e.g., three) cells.

[0032] In some examples, the cell is not necessarily stationary, and the geographic area of the cell can move based on the location of a mobile base station 110 (e.g., a mobile base station). In some examples, base stations 110 can be interconnected to one another and / or to one or more other base stations 110 or network nodes (not shown) in the wireless network 100 through various types of backhaul interfaces, such as a direct physical connection or a virtual network, using any suitable transport network.

[0033] Wireless network 100 can include one or more relay stations. A relay station is an entity that can receive a transmission of data from an upstream station (e.g., a base station 110 or a UE 120) and send a transmission of the data to a downstream station (e.g., a UE 120 or a base station 110). A relay station can be a UE 120 that can relay transmissions for other UEs 120. In Figure 1 In the illustrated example, BS 110d (e.g., a relay base station) can communicate with BS 110a (e.g., a macro base station) and UE 120d in order to communicate between BS 110a and UE 120d. A base station 110 that relays communications can be referred to as a relay station, a relay base station, a repeater, etc.

[0034] Wireless network 100 can be a heterogeneous network that includes base stations 110 of different types, such as macro base stations, pico base stations, femto base stations, relay base stations, etc. These different types of base stations 110 can have different transmit power levels, different coverage areas, and different impacts on interference in wireless network 100. For example, macro base stations can have a high transmit power level (e.g., 5 to 40 Watts) whereas pico base stations, femto base stations, and relay base stations can have lower transmit power levels (e.g., 0.1 to 2 Watts).

[0035] A network controller 130 can couple to a set of base stations 110 and can provide coordination and control for these base stations 110. The network controller 130 can communicate with the base stations 110 via a backhaul communication link. The base stations 110 can communicate with one another directly or indirectly via wireless or wireline backhaul communication links.

[0036] The UEs 120 can be dispersed throughout the wireless network 100, and each UE 120 can be stationary or mobile. A UE 120 can include, for example, an access terminal, a terminal, a mobile station, and / or a subscriber unit. A UE 120 can 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, a biometric device, a wearable device (e.g., a smart watch, smart clothing, smart glasses, a smart wristband, smart jewelry (e.g., a smart ring or a smart bracelet)), an entertainment device (e.g., a music device, a video device, and / or a satellite radio), a vehicular component or sensor, a smart meter / sensor, industrial manufacturing equipment, a global positioning system device, and / or any other suitable device that is configured to communicate via a wireless medium.

[0037] Some UEs 120 can be considered machine-type communication (MTC) or evolved or enhanced machine-type communication (eMTC) UEs. MTC and / or eMTC UEs can include, for example, robots, drones, remote devices, sensors, meters, monitors, and / or location tags, that can communicate with a base station, another device (e.g., remote device), or some other entity. A

[0038] In general, any number of wireless networks 100 can be deployed in a given geographic area. Each wireless network 100 can support a particular RAT and can operate on one or more frequencies. A RAT can be referred to as a radio technology, an air interface, and / or the like. A frequency can be referred to as a carrier, a frequency channel, and / or the like. Each frequency can 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 can be deployed.

[0039] In some examples, two or more UEs 120 (e.g., shown as UE 120a and UE 120e) can communicate directly using one or more sidelink channels (e.g., without using base station 110 as an intermediary to communicate with one another). For example, UE s 120 can communicate using peer-to-peer (P2P) communications, device-to-device (D2D) communications, vehicle-to-everything (V2X) protocols (which can include vehicle-to- vehicle (V2V) protocols, vehicle-to-infrastructure (V2I) protocols, or vehicle-to-pedestrian (V2P) protocols, and / or mesh networking. In this example, UEs 120 can perform scheduling operations, resource selection operations, and / or other operations described elsewhere herein as being performed by base stations 110.

[0040] Devices of wireless network 100 can use electromagnetic spectrum for communications, which can be subdivided by frequency or wavelength into various classes, bands, channels, and / or the like. For example, devices of wireless network 100 can communicate using one or more operating bands. In 5G NR, two initial operating bands were identified as frequency range designation FR1 (410 MHz - 7.125 GHz) and FR2 (24.25 GHz - 52.6 GHz). It should be understood that although a portion of FR1 is greater than 6 GHz, FR1 is often referred to (interchangeably) as a “Sub-6 GHz” band in various documents and articles. A similar naming convention can also apply to FR2, which is sometimes referred to (interchangeably) as a millimeter wave (mmW) band, despite being different from the extremely high frequency (EHF) band (30 GHz - 300 GHz) which is identified by the International Telecommunications Union (ITU) as a “millimeter wave” band.

[0041] The frequencies between FR1 and FR2 are often referred to as mid-band frequencies. Recent 5G NR studies have identified operating bands in these mid-band frequencies as frequency range designation FR3 (7.125 GHz - 24.25 GHz). Bands within FR3 can inherit FR1 and / or FR2 characteristics, and thus can effectively extend the features of FR1 and / or FR2 to mid-band frequencies. Furthermore, even higher bands are currently under exploration to extend 5G NR operations beyond 52.6 GHz. For example, three higher operating bands have been identified as frequency range designation FR4a or FR4-1 (52.6 GHz - 71 GHz), FR4 (52.6 GHz - 114.25 GHz), and FR5 (114.25 GHz - 300 GHz). Each of these higher bands fall within the EHF band.

[0042] With the above examples in mind, unless specifically stated otherwise, it should be understood that the term“sub-6 GHz” or the like, if used herein, can broadly represent frequencies below 6 GHz, can be within FR1, or can include mid-band frequency ranges. Further, unless specifically stated otherwise, it should be understood that the term“millimeter wave” or“mmW” or the like, if used herein, can broadly represent frequencies that can include mid-band frequency ranges, can be within FR2, FR4, FR4-a, or FR4-1, and / or FR5, or can be within the EHF frequency band. It is contemplated that the frequencies included in these operating bands (e.g., FR1, FR2, FR3, FR4, FR4-a, FR4-1, and / or FR5) can be modified, and techniques described herein are applicable to those modified frequency ranges.

[0043] As described above, Figure 1 are provided as examples. Other examples can differ from what is described with respect to at least one of the Figure 1 Aspects described. In some aspects, the wireless network 100 can further include one or more wired components. For example, one or more UEs 120 can receive data over wireless as well as via wired connections and combine the received data packets to increase throughput.

[0044] Figure 2 is a diagram illustrating an example 200 of a base station 110 in communication with a UE 120 in a wireless network 100, in accordance with the present disclosure. The base station 110 can be equipped with a set of antennas 234a through 234t, such as T antennas (T > 1). The UE 120 can be equipped with a set of antennas 252a through 252r, such as R antennas (R > 1).

[0045] At base station 110, a transmit processor 220 can receive data from a data source 212 for one or more UEs 120 (or groups of UEs 120). Transmit processor 220 can select one or more modulation and coding schemes (MCSs) for each UE 120 based at least in part on one or more channel quality indicators (CQIs) received from that UE 120. Base station 110 can process (e.g., encode and modulate) the data for each UE 120 based at least in part on the MCS(s) selected for the UE 120 and can provide data symbols for the UE 120. Transmit processor 220 can process system information (e.g., for semi-static resource partitioning information (SRPI)) and control information (e.g., CQI requests, grants, and / or upper layer signaling) and provide overhead symbols and control symbols. Transmit processor 220 can generate reference symbols for reference signals (e.g., a cell-specific reference signal (CRS) or a demodulation reference signal (DMRS)) and synchronization signals (e.g., a primary synchronization signal (PSS) or a secondary synchronization signal (SSS)). A transmit (TX) multiple-input multiple-output (MIMO) processor 230 can perform spatial processing (e.g., precoding) on the data symbols, the control symbols, the overhead symbols, and / or the reference symbols, if applicable, and can provide a set of output symbol streams (e.g., T output symbol streams) to a corresponding set of modems 232 (e.g., T modems), shown as modems 232a through 232t. Each output symbol stream can be provided to a modulator component (shown as MOD) of a respective modems 232. Each modems 232 can use a respective modulator component to process a respective output symbol stream (e.g., for OFDM) to obtain an output sample stream. Each modems 232 can further use a respective modulator component to process (e.g., convert to analog, amplify, filter, and / or upconvert) the output sample stream to obtain a downlink signal. Modems 232a through 232t can transmit a set of downlink signals (e.g., T downlink signals) via a corresponding set of antennas 234 (e.g., T antennas), shown as antennas 234a through 234t.

[0046] At the UE 120, a set of antennas 252 (shown as antennas 252a through 252r) can receive the downlink signals from base station 110 and / or other base stations 110 and can provide a set of received signals (e.g., R received signals) to a set of modems 254 (e.g., R modems), shown as modems 254a through 254r. For example, each received signal can be provided to a demodulator component (shown as DEMOD) of modems 254. Each demodulator 254 can condition (e.g., filter, amplify, downconvert, and / or digitize) a received signal to obtain input samples using a respective demodulator component. Each modem 254 can further process the input samples (e.g., for OFDM) using a demodulator component to obtain received symbols. A MIMO detector 256 can obtain received symbols from modems 254, perform MIMO detection on the received symbols if applicable, and can provide detected symbols. A receive processor 258 can process (e.g., demodulate and decode) the detected symbols, can provide decoded data for UE 120 to a data sink 260, and can provide decoded control information and system information to a controller / processor 280. The term “controller / processor” can refer to one or more controllers, one or more processors, or combinations thereof. A channel processor can determine reference signal received power (RSRP) parameters, receive signal strength indicator (RSSI) parameters, reference signal received quality (RSRQ) parameters, and / or CQI parameters, among other examples. In some examples, one or more components of UE 120 can be included in a housing 284.

[0047] Network controller 130 can include communication unit 294, controller / processor 290, and memory 292. Network controller 130 can include, for example, one or more devices in a core network. Network controller 130 can communicate with base station 110 via communication unit 294.

[0048] One or more antennas (e.g., antennas 234a through 234t and / or antennas 252a through 252r) can include or can be included in one or more antenna panels, one or more antenna groups, one or more sets of antenna elements, and / or one or more antenna arrays, among other examples. An antenna panel, antenna group, set of antenna elements, and / or antenna array can include one or more antenna elements (within a single housing or multiple housings), a set of co-planar antenna elements, a set of non-co-planar antenna elements, and / or one or more antenna elements coupled to one or more transmit and / or receive components (such as one or more components of Figure 2

[0049] ​On the uplink, at UE 120, a transmit processor 264 can receive and process data from a data source 262 and control information (e.g., for reports comprising RSRP, RSSI, RSRQ, and / or CQI) from controller / processor 280. Transmit processor 264 can also generate reference symbols for one or more reference signals. The symbols from transmit processor 264 can be precoded by a TX MIMO processor 266 if applicable, further processed by modems 254 (e.g., for DFT-s-OFDM or CP-OFDM), and transmitted to base station 110. In some examples, modems 254 of UE 120 can include modulators and demodulators. In some examples, UE 120 includes a transceiver. The transceiver can include any combination of antenna 252, modems 254, MIMO detector 256, receive processor 258, transmit processor 264, and / or TX MIMO processor 266. The processor (e.g., controller / processor 280) and memory 282 can utilize the transceiver to perform any of the aspects of the methods described herein (e.g., with reference to Figures 6 to 11 ) at UE 120.

[0050] At base station 110, the uplink signals from UE 120 and / or other UEs can be received by antennas 234, processed by modems 232 (e.g., demodulator components of modems 232, shown as DEMOD), 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 can provide the decoded data to a data sink 239 and the decoded control information to a controller / processor 240. Base station 110 can include communication unit 244 and can communicate with network controller 130 via communication unit 244. Base station 110 can include a scheduler 246 to schedule one or more UEs 120 for downlink and / or uplink communications. In some examples, modems 232 of base station 110 can include modulators and demodulators. In some examples, base station 110 includes a transceiver. The transceiver can include any combination of antenna 234, modems 232, MIMO detector 236, receive processor 238, transmit processor 220, and / or TX MIMO processor 230. The processor (e.g., controller / processor 240) and memory 242 can utilize the transceiver to perform any of the aspects of the methods described herein (e.g., with reference to Figures 6 to 11 ) at base station 110.

[0051] Controller / processor 240 of base station 110, controller / processor 280 of UE 120, and / or Figure 2Any other component may perform one or more techniques associated with random access timing, as described in more detail elsewhere herein. For example, the controller / processor 240 of base station 110, the controller / processor 280 of UE 120, and / or Figure 2 Any other component can execute or direct, for example Figure 8 The process 800 Figure 9 The operation of process 900 and / or other processes described herein. Memory 242 and memory 282 may store data and program code of base station 110 and UE 120, respectively. In some examples, memory 242 and / or memory 282 may include a non-transitory computer-readable medium storing one or more instructions (e.g., code and / or program code) for wireless communication. For example, one or more instructions, when executed by one or more processors of base station 110 and / or UE 120 (e.g., directly executed, or executed after compilation, transformation, and / or interpretation), may cause one or more processors, UE 120, and / or base station 110 to perform or direct, for example... Figure 8 The process 800 Figure 9 The operation of process 900 and / or other processes described herein. In some examples, the execution instructions may include run instructions, transformation instructions, compilation instructions, and / or interpretation instructions, etc.

[0052] In some aspects, UE (e.g., Figure 10 The UE 120 and / or device 1000 may include a means for receiving signals from a base station (e.g., Figure 11 The base station 110 and / or device 1100) receive a message indicating a plurality of subsets within a set of random access opportunities, wherein each subset of the plurality of subsets is associated with a corresponding beam among a plurality of beams, wherein each corresponding beam is different from the remaining beams among the plurality of beams; and / or a component for transmitting at least one random access preamble to the base station at least in part based on the message, wherein the at least one random access preamble is transmitted within one or more subsets of the plurality of subsets using one or more corresponding beams among the plurality of beams. Components for the UE to perform the operations described herein may include, for example, one or more of antenna 252, modem 254, MIMO detector 256, receive processor 258, transmit processor 264, TX MIMO processor 266, controller / processor 280, or memory 282.

[0053] In some aspects, base stations (e.g., Figure 11 The base station 110 and / or device 1100) may include methods for sending signals to the UE (e.g., Figure 10a component for transmitting, from the UE 120 and / or the apparatus 1000, a message indicating a plurality of subsets within the set of random access occasions, where each subset of the plurality of subsets is associated with a corresponding beam of the plurality of beams, where each corresponding beam is different from a remaining beam of the plurality of beams; and / or a component for receiving, from the UE, at least one random access preamble based at least in part on the message, where the at least one random access preamble is received within one or more subsets of the plurality of subsets using one or more corresponding beams of the plurality of beams. The components for the base station to perform the operations described herein can include, for example, one or more of the transmit processor 220, the TX MIMO processor 230, the modems 232, the antennas 234, the MIMO detector 236, the receive processor 238, the controller / processor 240, the memory 242, or the scheduler 246.

[0054] Although Figure 2 The blocks in FIG. 14 are presented to provide a general description of the functionality of various aspects of the disclosure, and do not require a particular

[0055] As described above, Figure 2 are provided as examples. Other examples can differ from what is described with respect to at least one of the Figure 2 Aspects described with respect to FIG. 14 can include one or more of the following features. In some aspects, Figure 2 The hardware depicted in FIG. 14 can be integrated (e.g., the controller / processor 240 is at least partially integrated with the memory 242, the controller / processor 280 is at least partially integrated with the memory 282, etc.). In some aspects, Figure 2 The hardware depicted in FIG. 14 can be separated (e.g., the functionality of the transmit processor 220, the TX MIMO processor 230, the modulators 232, the antennas 234, the demodulators 232, the MIMO detector 236, the receive processor 238, the controller / processor 240, the memory 242, and / or the scheduler 246 can be conceptually, virtually, and / or physically separated between a central unit (CU) and a distributed unit (DU)).

[0056] Figure 3 is a diagram illustrating an example beamforming architecture 300 that supports beamforming for mmW communications, in accordance with the present disclosure. In some aspects, the architecture 300 can implement aspects of the wireless network 100. In some aspects, the architecture 300 can be implemented in a transmitting device (e.g., a first wireless communication device, a UE, or a base station) and / or a receiving device (e.g., a second wireless communication device, a UE, or a base station), as described herein.

[0057] Generally, Figure 3 is a diagram illustrating example hardware components of a wireless communication device according to certain aspects of the present disclosure. The illustrated components can include components that can be used for antenna element selection and / or for beamforming for wireless signal transmission. There are many architectures for antenna element selection and implementing phase shifts, only one example of which is shown herein. The architecture 300 includes a modem (modulator / demodulator) 302, a digital-to-analog converter (DAC) 304, a first mixer 306, a second mixer 308, and a splitter 310. The architecture 300 also includes a plurality of first amplifiers 312, a plurality of phase shifters 314, a plurality of second amplifiers 316, and an antenna array 318 including a plurality of antenna elements 320. In some examples, the modem 302 can be one or more of the modems 232 or modems 254 described above. Figure 2 The modem 302 is described above in connection with

[0058] Transmission lines or other waveguides, wires, and / or traces are shown connecting the various components to illustrate how signals to be transmitted propagate between the components. Reference numbers 322, 324, 326, and 328 represent regions in which different types of signals propagate or are processed in the architecture 300. Specifically, reference number 322 represents a region in which digital baseband signals propagate or are processed, reference number 324 represents a region in which analog baseband signals propagate or are processed, reference number 326 represents a region in which analog intermediate frequency (IF) signals propagate or are processed, and reference number 328 represents a region in which analog radio frequency (RF) signals propagate or are processed. The architecture also includes a local oscillator A 330, a local oscillator B 332, and a controller / processor 334. In some aspects, the controller / processor 334 corresponds to the controller / processor 240 of the base station described above in connection with Figure 2 and / or the controller / processor 280 of the UE described above in connection with Figure 2

[0059] Each antenna element 320 can include one or more sub-elements for radiating or receiving RF signals. For example, a single antenna element 320 can include a first sub-element that is cross-polarized with a second sub-element, which can be used to independently transmit cross-polarized signals. The antenna elements 320 can include patch antennas, dipole antennas, or other types of antennas arranged in a linear pattern, a two-dimensional pattern, or other pattern. The spacing between the antenna elements 320 can be such that signals having a desired wavelength transmitted by the antenna elements 320, respectively, can interact or interfere (e.g., to form a desired beam). For example, given an expected range of wavelengths or frequencies, the spacing can provide a quarter wavelength, a half wavelength, or other proportion of a wavelength of the spacing between adjacent antenna elements 320 to enable interaction or interference of signals transmitted by different antenna elements 320 within the expected range. ​

[0060] The modem 302 processes and generates digital baseband signals, and can also control the operation of the DAC 304, the first and second mixers 306, 308, the splitter 310, the first amplifier 312, the phase shifter 314, and / or the second amplifier 316 to transmit signals via one or more or all of the antenna elements 320. The modem 302 can process the signals and control the operations in accordance with a communication standard, such as the wireless standards discussed herein. The DAC 304 can convert the digital baseband signals received from the modem 302 (and signals to be transmitted) into analog baseband signals. The first mixer 306 upconverts the analog baseband signals to analog IF signals within an IF using a local oscillator A 330. For example, the first mixer 306 can mix the signals with an oscillating signal generated by the local oscillator A 330 to “move” the baseband analog signals to the IF. In some cases, some processing or filtering (not shown) can occur at the IF. The second mixer 308 upconverts the analog IF signals to analog RF signals using a local oscillator B 332. Similar to the first mixer, the second mixer 308 can mix the signals with an oscillating signal generated by the local oscillator B 332 to “move” the IF analog signals to the RF or the frequency at which the signals will be transmitted or received. The modem 302 and / or the controller / processor 334 can adjust the frequency of the local oscillator A 330 and / or the local oscillator B 332, resulting in the desired IF and / or RF frequencies and used to facilitate the processing and transmission of signals within the desired bandwidth.

[0061] In the illustrated architecture 300, the signals upconverted by the second mixer 308 are split or duplicated into multiple signals by the splitter 310. The splitter 310 in the architecture 300 divides the RF signal into multiple identical or nearly identical RF signals. In other examples, the splitting can occur on any type of signal, including baseband digital, baseband analog, or IF analog signals. Each of these signals can correspond to one of the antenna elements 320, and the signal is amplified by the amplifiers 312 and 316, the phase shifter 314, and / or other elements corresponding to the respective antenna element 320 and processed thereby for provision to and transmission by the respective antenna element 320 of the antenna array 318. In one example, the splitter 310 can be an active splitter that is connected to a power source and provides some gain such that the power level of the RF signals leaving the splitter 310 is equal to or greater than the signal entering the splitter 310. In another example, the splitter 310 is a passive splitter that is not connected to a power source, and the power level of the RF signals leaving the splitter 310 can be lower than the RF signal entering the splitter 310.

[0062] After being split by the splitter 310, the resulting RF signals can enter an amplifier, such as the first amplifier 312 or the phase shifter 314 corresponding to the antenna element 320. The first and second amplifiers 312 and 316 are shown with dashed lines because in certain aspects one or both of them can not be necessary. In some aspects, both the first amplifier 312 and the second amplifier 316 are present. In some aspects, neither the first amplifier 312 nor the second amplifier 316 is present. In some aspects, one of the two amplifiers 312 and 316 is present and the other is not. For example, if the splitter 310 is an active splitter, then the first amplifier 312 can not be used. As another example, if the phase shifter 314 is an active phase shifter that can provide gain, then the second amplifier 316 can not be used.

[0063] The amplifiers 312 and 316 can provide a desired level of positive or negative gain. Positive gain (positive dB) can be used to increase the amplitude of the signal radiated by a particular antenna element 320. Negative gain (negative dB) can be used to decrease the amplitude of the signal radiated by a particular antenna element and / or to suppress radiation. Each of the amplifiers 312 and 316 can be independently controlled (e.g., by the modem 302 or the controller / processor 334) to provide independent gain control for each antenna element 320. For example, the modem 302 and / or the controller / processor 334 can have at least one control line connected to each of the splitter 310, the first amplifier 312, the phase shifter 314, and / or the second amplifier 316, which can be used to configure the gain to provide a desired amount of gain for each component and in turn for each antenna element 320.

[0064] The phase shifters 314 can provide a configurable phase shift or phase offset to the corresponding RF signal to be transmitted. The phase shifters 314 can be passive phase shifters that are not directly connected to a power source. Passive phase shifters can introduce some insertion loss. The second amplifiers 316 can boost the signal to compensate for the insertion loss. The phase shifters 314 can be active phase shifters that are connected to a power source, such that the active phase shifters provide an amount of gain or prevent insertion loss. The settings of each phase shifter 314 are independent, meaning that each can be independently set to provide a desired amount of phase shift or the same amount of phase shift or some other configuration. The modem 302 and / or the controller / processor 334 can have at least one control line connected to each phase shifter 314, which can be used to configure the phase shifters 314 to provide a desired amount of phase shift or phase offset between the antenna elements 320.

[0065] In the illustrated architecture 300, the RF signals received by the antenna elements 320 are provided to one or more first amplifiers 356 to enhance the signal strength. The first amplifiers 356 can be connected to the same antenna array 318 (e.g., for time division duplex (TDD) operations). The first amplifiers 356 can be connected to different antenna arrays 318. The enhanced RF signals are input into one or more phase shifters 354 to provide a configurable phase shift or phase offset for the corresponding received RF signals to enable reception via one or more Rx beams. The phase shifters 354 can be active phase shifters or passive phase shifters. The settings of the phase shifters 354 are independent, meaning each can be independently set to provide a desired amount of phase shift or the same amount of phase shift or some other configuration. The modem 302 and / or the controller / processor 334 can have at least one control line connected to each phase shifter 354, which can be used to configure the phase shifters 354 to provide a desired amount of phase shift or phase offset between the antenna elements 320 to enable reception via one or more Rx beams.

[0066] The outputs of the phase shifters 354 can be input to one or more second amplifiers 352 for signal amplification of the phase-shifted received RF signals. The second amplifiers 352 can be individually configured to provide a configured amount of gain. The second amplifiers 352 can be individually configured to provide an amount of gain to ensure that the signals input to the combiner 350 have the same amplitude. The amplifiers 352 and / or 356 are shown in dashed lines because, in certain aspects, they can not be necessary. In some aspects, both amplifiers 352 and 356 are present. In another aspect, neither amplifier 352 nor 356 is present. In other aspects, one of the amplifiers 352 and 356 is present and the other is not.

[0067] In the illustrated architecture 300, the signals output by the phase shifters 354 (through the amplifiers 352, when present) are combined in the combiner 350. The combiner 350 in the architecture 300 combines the RF signals into one signal. The combiner 350 can be a passive combiner (e.g., not connected to a power source), which can result in some insertion loss. The combiner 350 can be an active combiner (e.g., connected to a power source), which can result in some signal gain. When the combiner 350 is an active combiner, it can provide different (e.g., configurable) amounts of gain for each input signal so that the input signals have the same amplitude when combined. When the combiner 350 is an active combiner, the combiner 350 can not need the second amplifiers 352 because the active combiner can provide signal amplification.

[0068] The output of the combiner 350 is input to mixers 348 and 346. The mixers 348 and 346 generally down-convert the received RF signal using inputs from local oscillators 372 and 370, respectively, to create an intermediate or baseband signal that carries the encoded and modulated information. The outputs of the mixers 348 and 346 are input to an analog-to-digital converter (ADC) 344 for conversion to a digital signal. The digital signal output from the ADC 344 is input to the modem 302 for baseband processing, such as decoding, de-interleaving, or similar operations.

[0069] The architecture 300 is presented by way of example only, to illustrate an architecture for transmitting and / or receiving signals. In some cases, the architecture 300 and / or each portion of the architecture 300 can be repeated multiple times within one architecture to accommodate or provide any number of RF chains, antenna elements, and / or antenna panels. Moreover, multiple alternative architectures are possible and contemplated. For example, although only a single antenna array 318 is shown, two, three, or more antenna arrays can be included, each with one or more of their own corresponding amplifiers, phase shifters, splitters, mixers, DACs, ADCs, and / or modems. For example, a single UE can include two, four, or more antenna arrays for transmitting or receiving signals at different physical locations on the UE or in different directions.

[0070] Moreover, in different architectures, the mixers, splitters, amplifiers, phase shifters, and other components can be located in different signal type regions (e.g., represented by different numbers in reference numerals 322, 324, 326, and 328). For example, splitting the signal to be transmitted into multiple signals can occur at an analog RF, an analog IF, an analog baseband, or a digital baseband frequency in different examples. Similarly, amplification and / or phase shifting can also occur at different frequencies. For example, in some aspects, one or more of the splitter 310, the amplifiers 312 and 316, or the phase shifter 314 can be located between the DAC 304 and the first mixer 306 or between the first mixer 306 and the second mixer 308. In one example, the functionality of one or more components can be combined in one component. For example, the phase shifter 314 can perform amplification to include or replace the first amplifier 312 and / or the second amplifier 316. As another example, the phase shift can be implemented by the second mixer 308 to avoid setting up a separate phase shifter 314. This technique is sometimes referred to as local oscillator (LO) phase shifting. In some aspects of this configuration, there can be multiple IF-to-RF mixers within the second mixer 308 (e.g., one for each antenna element chain), and the local oscillator B 332 can provide a different local oscillator signal (with a different phase shift) to each IF-to-RF mixer.

[0071] The modem 302 and / or the controller / processor 334 can control one or more of the other components 304 to 372 to select one or more antenna elements 320 and / or form a beam for transmitting one or more signals. For example, an antenna element 320 can be individually selected or deselected for transmission of a single signal (or multiple signals) by controlling the amplitude of one or more corresponding amplifiers, such as the first amplifier 312 and / or the second amplifier 316. Beamforming includes generating a beam using multiple signals on different antenna elements, where one or more or all of the multiple signals are phase shifted relative to each other. The formed beam can carry a physical or higher layer reference signal or information. As each of the multiple signals radiates from a respective antenna element 320, the radiated signals interact, interfere (constructive and destructive interference), and amplify to form a resultant beam. The shape (such as the amplitude, width, and / or presence of side lobes) and direction (such as the angle of the beam relative to the surface of the antenna array 318) can be dynamically controlled by modifying the phase shift or phase offset implemented by the phase shifters 314 and the amplitudes of the multiple signals relative to each other implemented by the amplifiers 312 and 316. The controller / processor 334 can be located partially or fully within one or more of the other components of the architecture 300. For example, in some aspects, the controller / processor 334 can be located within the modem 302.

[0072] As described above, Figure 3 are provided as examples. Other examples can differ from what is described with respect to at least one of the described examples. Figure 3 In some aspects, the beamforming architecture 300 can include additional components, such as a dielectric wall and / or other components that facilitate constructive and destructive interference needed for beamforming.

[0073] Figure 4 is a diagram illustrating an example 400 of a synchronization signal (SS) hierarchy, in accordance with the present disclosure. As shown, Figure 4 the SS hierarchy can include a set of SS bursts 405, which can include a plurality of SS bursts 410, shown as SS burst 0 through SS burst N-1, where N is a maximum number of repetitions of SS bursts 410 that a base station can transmit. As further shown, each SS burst 410 can include one or more SS blocks (SSBs) 415, shown as SSB 0 through SSB M-1, where M is a maximum number of SSBs 415 that an SS burst 410 can carry. In some aspects, different SSBs 415 can be differently beamformed (e.g., transmitted using different beams) and can be used for cell search, cell acquisition, beam management, and / or beam selection (e.g., as part of an initial network access procedure). As Figure 4As shown, a wireless node (e.g., base station 110) can periodically transmit a set of SS bursts 405, such as every X milliseconds. In some aspects, the set of SS bursts 405 can have a fixed or dynamic length, as shown in Y milliseconds in Figure 4 In some cases, the set of SS bursts 405 or the SS burst 410 can be referred to as a discovery reference signal (DRS) transmission window or an SSB measurement time configuration (SMTC) window.

[0074] In some aspects, the SSB 415 can include resources carrying a PSS 420, an SSS 425, and / or a physical broadcast channel (PBCH) 430. In some aspects, multiple SSBs 415 are included in the SS burst 410 (e.g., transmitted on different beams), and on each SSB 415 of the SS burst 410, the PSS 420, the SSS 425, and / or the PBCH 430 can be the same. In some aspects, a single SSB 415 can be included in the SS burst 410. In some aspects, the SSB 415 can be at least four symbols (e.g., OFDM symbols) in length, where each symbol carries one or more PSSs 420 (e.g., occupying one symbol), SSSs 425 (e.g., occupying one symbol), and / or PBCHs 430 (e.g., occupying two symbols). In some aspects, the SSB 415 can be referred to as an SS / PBCH block.

[0075] In some aspects, the symbols of the SSB 415 are contiguous, as shown in Figure 4 In some aspects, the symbols of the SSB 415 are non-contiguous. Similarly, in some aspects, one or more SSBs 415 of the SS burst 410 can be transmitted in contiguous wireless resources (e.g., contiguous symbols) during one or more slots. Additionally or alternatively, one or more SSBs 415 of the SS burst 410 can be transmitted in non-contiguous wireless resources.

[0076] In some aspects, the SS burst 410 can have a burst periodicity, and the SSB 415 of the SS burst 410 can be transmitted by the wireless node (e.g., base station 110) in accordance with the burst periodicity. In this case, the SSB 415 can repeat during each SS burst 410. In some aspects, the set of SS bursts 405 can have a set periodicity, whereby the SS bursts 410 of the set of SS bursts 405 are transmitted by the wireless node in accordance with a fixed set periodicity. In other words, the SS burst 410 can repeat during each set of SS bursts 405.

[0077] In some aspects, the SSB 415 can include an SSB index, which can correspond to a beam used to carry the SSB 415. As one example, the UE 120 can monitor and / or measure the SSB 415 using different receive (Rx) beams during an initial network access procedure and / or a cell search procedure. Based at least in part on the monitoring and / or measuring, the UE 120 can indicate one or more SSBs 415 with best signal parameters (e.g., RSRP parameters) to the base station 110. The base station 110 and the UE 120 can use the one or more indicated SSBs 415 to select one or more beams for communication between the base station 110 and the UE 120 (e.g., for a random access channel (RACH) procedure). Additionally, or alternatively, the UE 120 can use the SSB 415 and / or the SSB index to determine a cell timing of a cell (e.g., a serving cell) via which the SSB 415 is received.

[0078] As described above, Figure 4 are provided as examples. Other examples can differ from what is described with respect to at least one of the Figure 4 described. In some aspects, the PBCH can include a DMRS and / or include a payload of a master information block (MIB).

[0079] Figure 5 is a diagram illustrating an example of a four-step random access procedure in accordance with the present disclosure. As shown in Figure 5 , the base station 110 and the UE 120 can communicate with one another to perform a four-step random access procedure.

[0080] As shown by reference number 505, the base station 110 can transmit and the UE 120 can receive one or more SSBs and random access configuration information. In some aspects, the random access configuration information can be transmitted in and / or indicated by system information (e.g., in one or more system information blocks (SIBs)) and / or SSBs, such as for contention-based random access. Additionally, or alternatively, the random access configuration information can be transmitted in a radio resource control (RRC) message and / or a physical downlink control channel (PDCCH) command message that triggers a RACH procedure, such as for contention-free random access. The random access configuration information can include one or more parameters to be used in the random access procedure, such as one or more parameters for transmitting a random access message (RAM) and / or one or more parameters for receiving a random access response (RAR).

[0081] As shown by reference number 510, the UE 120 can transmit a RAM, which can include a preamble (sometimes referred to as a random access preamble, a physical RACH (PRACH) preamble, or a RAM preamble). The message including the preamble can be referred to as a message 1, msgl, MSG1, first message, or initial message in a four-step random access procedure. The random access message can include a random access preamble identifier.

[0082] As shown by reference number 515, the base station 110 can transmit a RAR as a reply to the preamble. The message including the RAR can be referred to as a message 2, msg2, MSG2, or second message in a four-step random access procedure. In some aspects, the RAR can indicate the detected random access preamble identifier (e.g., received from the UE 120 in msgl). Additionally, or alternatively, the RAR can indicate a resource allocation for the UE 120 to use to transmit a message 3 (msg3).

[0083] In some aspects, as part of the second step of the four-step random access procedure, the base station 110 can transmit a PDCCH communication for the RAR. The PDCCH communication can schedule a physical downlink shared channel (PDSCH) communication including the RAR. For example, the PDCCH communication can indicate a resource allocation of the PDSCH communication. Further, as part of the second step of the four-step random access procedure, the base station 110 can transmit the PDSCH communication for the RAR, as scheduled by the PDCCH communication. The RAR can be included in a medium access control (MAC) protocol data unit (PDU) of the PDSCH communication.

[0084] As shown by reference number 520, the UE 120 can transmit an RRC connection request message. The RRC connection request message can be referred to as a message 3, msg3, MSG3, or third message of the four-step random access procedure. In some aspects, the RRC connection request can include a UE identifier, uplink control information (UCI), and / or a physical uplink shared channel (PUSCH) communication (e.g., the RRC connection request).

[0085] As shown by reference number 525, the base station 110 can transmit an RRC connection setup message. The RRC connection setup message can be referred to as a message 4, msg4, MSG4, or fourth message of the four-step random access procedure. In some aspects, the RRC connection setup message can include a detected UE identifier, a timing advance value, and / or contention resolution information. As shown by reference number 530, if the UE 120 successfully receives the RRC connection setup message, the UE 120 can transmit a hybrid automatic repeat request (HARQ) acknowledgement (ACK).

[0086] As described above, Figure 5This is provided as an example. Other examples may differ from those provided. Figure 5 As described. In some respects, other examples may use a two-step random access procedure.

[0087] When wireless communication is being conducted, the UE and / or base station can perform beamforming (e.g., using a combination of...). Figure 3 (Described hardware). In some cases, when using mmW and / or other radio frequencies (e.g., FR2 and / or other frequencies), the UE and / or base station may experience reduced signal power. Therefore, the UE and / or base station can perform beamfinding, whereby the UE and / or base station selects a sub-beam within a selected beam (e.g., a narrower sub-beam within the selected beam) to increase signal power. The UE and / or base station can perform beamfinding for transmission (e.g., by selecting a sub-beam that can be transmitted at higher power) and / or reception (e.g., by selecting a receive filter that is narrower than the receive filter used to receive transmissions on the selected beam).

[0088] Some of the techniques and apparatus described herein allow a base station (e.g., base station 110) to configure a set of random access opportunities for a UE (e.g., UE 120) into multiple subsets, such that each subset of random access opportunities is associated with a corresponding beam. Each corresponding beam is also different from the remaining beams in the plurality of beams. Therefore, UE 120 can perform beam refinement on the subsets (e.g., by selecting sub-beams that can be transmitted at higher power). Thus, UE 120 can improve the reliability and quality of transmission to base station 110. Additionally or alternatively, base station 110 can perform beam refinement within a subset (e.g., by selecting a narrower receive filter). Base station 110 can perform precise beam refinement because UE 120 uses the same corresponding beam for transmission within each subset. Therefore, base station 110 can improve the reliability and quality of reception at base station 110.

[0089] Figure 6 This is a diagram illustrating example 600 associated with a random access timing bundle according to this disclosure. Figure 6 As shown, Example 600 includes a set of random access opportunities 605a, 605b, 605c, and 605d (also referred to as "RO"). A random access opportunity may include one or more time resources (e.g., one or more symbols spanning one or more time slots of one or more radio frames) during which a UE (e.g., UE 120) may send a random access preamble (e.g., as combined with...) to a base station (e.g., base station 110). Figure 5 (As described). In some respects, the set may include at least two random access opportunities.

[0090] In some aspects, the set can be periodic. For example, the set can include one or more random access occasions that repeat in time according to one or more periodicities. In some aspects, the set can be periodic and not end (e.g., until the base station 110 reconfigures the set, such as with an RRC message). Alternatively, the set can end after one of the random access occasions or after a certain number of periodicities occur. In some aspects, the set can include a finite number of random access occasions that are aperiodic.

[0091] As further shown in Figure 6 the set of random access occasions can be divided into multiple subsets (also referred to as “RO bundles”). For example, the base station 110 can transmit and the UE 120 can receive a message indicating the multiple subsets. In some aspects, the message can include an RRC message, a remaining minimum system information (RMSI) message, and / or another message. Each of the multiple subsets can be associated with a corresponding beam of the multiple beams (e.g., using the hardware formation described in connection with Figure 3 In example 600, a first subset (“RO bundle 1”) is associated with beam 610a, while a second subset (“RO bundle 2”) is associated with beam 610b. Additionally or alternatively, each of the multiple subsets can be associated with a corresponding synchronization signal of the multiple synchronization signals (e.g., the SSBs described in connection with Figure 4 In some aspects, each of the multiple synchronization signals can be associated with a corresponding beam of the multiple beams, and each corresponding beam can be different from the remaining beams of the multiple beams. Thus, the UE 120 can select one of the multiple beams by, for example, selecting a corresponding one of the multiple synchronization signals.

[0092] In some aspects, the multiple subsets can be different from one or more subsets associated with legacy UEs. For example, the legacy UEs can include one or more UEs that are not configured for bundling random access occasions (e.g., as described above), do not include hardware for beamforming (e.g., as described in connection with Figure 3 and / or are not configured to perform beam refinement (e.g., are not programmed to perform this operation and / or do not include hardware capable of performing this operation).

[0093] In some aspects, each subset of the plurality of subsets can be associated with a corresponding beam of the plurality of beams according to a rule stored in memory of the UE 120 and / or the base station 110. For example, the rule can be set forth in a 3GPP specification and / or another standard. Additionally, or alternatively, each subset of the plurality of subsets can be associated with a corresponding beam of the plurality of beams according to a rule indicated by a message from the base station 110. For example, a set of random access occasions can be divided into subsets, where each subset includes a number of consecutive random access occasions that can be represented by a variable k, where the variable is indicated by the message. In one example, when the set of random access occasions includes six random access occasions, the base station 110 can indicate k = 2, such that the set is divided into three subsets, where each subset includes two random access occasions that are consecutive in time. In another example, when the set of random access occasions includes six random access occasions that are repeated in time according to a periodicity, the base station 110 can indicate k = 3, such that the set is divided into two subsets, where each subset includes three random access occasions that are consecutive in time, and the subsets are repeated in time according to the periodicity.

[0094] Based at least in part on the message from the base station 110, the UE 120 can transmit at least one random access preamble within one or more subsets of the plurality of subsets using one or more corresponding beams of the plurality of beams. Accordingly, the UE 120 can select a beam to shape (e.g., using hardware described in connection with FIG. 2) for transmitting a random access preamble based at least in part on which subset of the plurality of subsets the UE 120 transmits the random access preamble. Figure 3

[0095] In some aspects, the UE 120 can transmit a plurality of random access preambles on random access occasions included within one subset of the plurality of subsets. The plurality of random access preambles can be copies of the same random access preamble, or be associated with one another (e.g., each random access preamble includes one or more data portions that link the preamble to the remaining preambles of the plurality of random access preambles). Accordingly, the base station 110 can perform beam refinement (e.g., by narrowing a receive filter) based at least in part on the plurality of random access preambles transmitted within the one subset. The base station 110 can perform refinement because the UE 120 will transmit the plurality of random access preambles using the same beam corresponding to the one subset. For example, as described in connection with FIG. 2, the base station 110 can narrow a receive filter based at least in part on the UE 120 transmitting a plurality of random access preambles within a subset of the plurality of subsets. Figure 6 ​As shown, the UE 120 transmits a random access preamble in the random access occasions 605a and 605b using the same beam 610a. In some aspects, the UE 120 can transmit multiple random access preambles on random access occasions included within one subset based at least in part on an indication of repeated transmissions from the base station 110. The indication can be included in a message from the base station 110 or in a separate message. Additionally, or alternatively, the indication can be included in a RRC message, RMSI, and / or another message.

[0096] Additionally, or alternatively, the UE 120 can transmit multiple random access preambles on random access occasions included in different subsets of the multiple subsets. The multiple random access preambles can be copies of the same random access preamble or be associated with each other (e.g., each random access preamble includes one or more data portions that link the preamble to the remaining preambles of the multiple random access preambles). Thus, the UE 120 can perform beam refinement (e.g., by sweeping sub-beams) based at least in part on the multiple random access preambles transmitted on different subsets. The UE 120 can perform refinement because the base station 110 does not expect the UE 120 to transmit multiple random access preambles on different subsets using the same beam. For example, as shown, the UE 120 transmits a random access preamble in the random access occasions 605a and 605c (or in the random access occasions 605b and 605d and / or another combination of random access occasions across subsets) using different beams (e.g., beams 610a and 610b, respectively). Figure 6

[0097] In some aspects, a legacy UE can transmit and the base station 110 can receive additional random access preambles. Thus, the base station 110 can receive from the UE 120 and the legacy UE using a combination of sub-beams and beams associated with the additional random access preambles based at least in part on the one or more corresponding beams used by the UE 120. For example, the base station 110 can perform beam refinement (e.g., as described above) based at least in part on the random access preamble transmitted by the UE 120 to determine a sub-beam for the UE 120. The base station 110 can combine the determined sub-beam with the beam used by the legacy UE to determine a receive filter to use such that the base station 110 can receive from both the UE 120 and the legacy UE.

[0098] By using the combination of techniques described in connection with FIG. 6, the base station 110 can receive from both the UE 120 and the legacy UE. For example, the base station 110 can receive a first random access preamble from the UE 120 and a second random access preamble from the legacy UE. The base station 110 can determine a first sub-beam for the UE 120 based at least in part on the first random access preamble and a second sub-beam for the legacy UE based at least in part on the second random access preamble. The base station 110 can combine the first sub-beam and the second sub-beam to determine a receive filter to use to receive from both the UE 120 and the legacy UE. Figure 6 ​The described techniques, the UE 120 can perform beam refinement on the subset (e.g., by selecting a sub-beam that can be transmitted with higher power). Thus, the UE 120 improves the reliability and quality of transmissions to the base station 110. Additionally or alternatively, the base station 110 can perform beam refinement within the subset (e.g., by selecting a narrower receive filter). Thus, the base station 110 improves the reliability and quality of reception at the base station 110.

[0099] As described above, Figure 6 are provided as examples. Other examples can differ from what is described with respect to at least one of the following. Figure 6 In some aspects, other examples can include more random access occasions (e.g., more than four) or fewer random access occasions (e.g., two or three). Additionally or alternatively, other examples can also include additional subsets, in turn including additional corresponding beams (e.g., more than two).

[0100] Figure 7 is a diagram illustrating an example 700 associated with random access occasion beams, in accordance with the present disclosure. As shown in Figure 7 the example 700 includes communication between a base station 110 and a UE 120. In some aspects, the base station 110 and UE 120 can be included in a wireless network, such as the wireless network 100.

[0101] In some aspects, as described in connection with Figure 6 the base station 110 can configure a set of random access occasions that are divided into a plurality of subsets (also referred to as “RO beams”). For example, the base station 110 can transmit and the UE 120 can receive one or more messages (e.g., RRC messages, RMSI, and / or other messages) indicating the set of random access occasions and the plurality of subsets. As further described in connection with Figure 6 each subset of the plurality of subsets can be associated with a corresponding beam of a plurality of beams (e.g., formed using the hardware described in connection with Figure 3 Additionally or alternatively, each subset of the plurality of subsets can be associated with a corresponding synchronization signal of a plurality of synchronization signals (e.g., SSBs described in connection with Figure 4 In some aspects, each synchronization signal of the plurality of synchronization signals can be associated with a corresponding beam of the plurality of beams, and each corresponding beam can be different from remaining beams of the plurality of beams. Thus, the UE 120 can select one of the plurality of beams by, for example, selecting a corresponding one of the plurality of synchronization signals.

[0102] As shown in connection with reference number 705, the UE 120 can transmit and the base station 110 can receive a random access preamble in a random access occasion included within one of the plurality of subsets (e.g., one “RO beam”). The UE 120 can transmit the random access preamble using the corresponding beam of the subset.

[0103] As shown in connection with reference number 710, the base station 110 can perform beam refinement. For example, the base station 110 can narrow or otherwise adjust a receive filter. The base station 110 can perform refinement because the UE 120 can transmit an additional random access preamble in the one subset (e.g., as described in connection with reference number 715) using the same beam corresponding to the one subset.

[0104] As shown in connection with reference number 715, the UE 120 can transmit and the base station 110 can receive another random access preamble in another random access occasion included within one of the plurality of subsets (e.g., one “RO beam”). The UE 120 can transmit the additional random access preamble using the corresponding beam of the subset. In some aspects, the random access preamble and the additional random access preamble can be a copy of the same random access preamble, or be linked to one another (e.g., the random access preamble includes one or more data portions that link the preamble to the additional random access preamble, and / or the additional random access preamble includes one or more data portions that link the additional preamble to the random access preamble).

[0105] In some aspects, the UE 120 can transmit the additional random access preamble based at least in part on an indication of the repeated transmission from the base station 110. The indication can be included in one or more messages used to configure the set of random access occasions and the plurality of subsets, or can be included in a separate message. Additionally, or alternatively, the indication can be included in an RRC message, an RMSI, and / or another message.

[0106] As shown in connection with reference number 720, the UE 120 can perform beam refinement. For example, the UE 120 can narrow or otherwise adjust a beam used to transmit to the base station 110. The UE 120 can perform refinement because the base station 110 does not expect the UE 120 to transmit random access preambles on different subsets using the same beam.

[0107] As shown in connection with reference number 725, the UE 120 can transmit and the base station 110 can receive a random access preamble in a random access occasion included within another of the plurality of subsets (e.g., another “RO beam”). The UE 120 can transmit the random access preamble using the corresponding beam of the subset.

[0108] As shown in connection with reference number 730, the base station 110 can perform beam refinement. For example, the base station 110 can narrow or adjust a receive filter. The base station 110 can perform refinement because the UE 120 can transmit an additional random access preamble in the same subset (e.g., as described below in connection with reference number 735) using the same beam corresponding to the same subset.

[0109] As shown in connection with reference number 735, the UE 120 can transmit and the base station 110 can receive another random access preamble in another random access occasion within the same subset (e.g., the same “RO beam”) of the multiple subsets. The UE 120 can transmit the additional random access preamble using the corresponding beam of the subset. In some aspects, the random access preamble and the additional random access preamble can be a copy of the same random access preamble, or be linked to one another (e.g., the random access preamble includes one or more data portions that link the preamble to the additional random access preamble, and / or the additional random access preamble includes one or more data portions that link the additional preamble to the random access preamble).

[0110] When the multiple subsets include more than two subsets, the UE 120 can perform additional beam refinement on additional subsets. Additionally or alternatively, when a subset includes more than two random access occasions, the base station 110 can perform additional beam refinement within the subset.

[0111] In some aspects, the base station 110 can further transmit and the UE 120 can receive a random access response (e.g., as described above in connection with Figure 4 In some aspects, the random access response can indicate a beam of the one or more corresponding beams to use.

[0112] Further, in some aspects, the UE 120 can further transmit and the base station 110 can receive an additional random access message (e.g., a msg3 as described above in connection with Figure 4 In some aspects, the UE 120 can transmit the additional random access message using the same beam as used for the one or more random access preambles. For example, the UE 120 can have transmitted a random access preamble within one subset, such that the UE 120 selects a corresponding beam for that subset. Alternatively, the UE 120 can transmit the additional random access message using a beam indicated by the random access response (e.g., as described above). For example, the UE 120 can have transmitted a random access preamble on a subset, such that the base station 110 indicates which of the corresponding beams of those subsets to use.

[0113] By using the techniques described above in connection with Figure 7The described technology allows UE 120 to improve the reliability and quality of transmission to base station 110. Additionally or alternatively, base station 110 can improve the reliability and quality of reception at base station 110.

[0114] As mentioned above, Figure 7 This is provided as an example. Other examples may differ from those provided. Figure 7 As described. In some respects, other examples may include more random access opportunities (e.g., more than four) or fewer random access opportunities (e.g., two or three). Additionally or alternatively, other examples may also include additional subsets, and thus additional corresponding beams (e.g., more than two).

[0115] Figure 8 This is a diagram illustrating an example process 800 performed by a UE, for example, according to this disclosure. Example process 800 is a UE (e.g., Figure 10 An example of UE 120 and / or device 1000 performing operations associated with random access timing.

[0116] like Figure 8 As shown, in some aspects, process 800 may include data from a base station (e.g., Figure 11 The base station 110 and / or device 1100 receive messages indicating multiple subsets within a set of random access opportunities (box 810). For example, as described herein, the UE (e.g., using...) Figure 10 The receiving component 1002 depicted can receive messages from the base station indicating multiple subsets within a set of random access opportunities. In some aspects, each subset in the multiple subsets is associated with a corresponding beam in a plurality of beams, and each corresponding beam is different from the remaining beams in the plurality of beams.

[0117] like Figure 8 As further illustrated herein, in some aspects, process 800 may include sending at least one random access preamble to the base station based at least in part on the message (box 820). For example, as described herein, the UE (e.g., using...) Figure 10 The transmitting component 1004 described herein can transmit at least one random access preamble to the base station, at least in part, based on the message. In some aspects, at least one random access preamble is transmitted within one or more subsets of a plurality of beams using one or more corresponding beams of a plurality of beams.

[0118] Process 800 may include additional aspects, such as any single aspect or any combination of aspects of one or more other processes described below and / or elsewhere herein.

[0119] In the first aspect, each subset of the multiple subsets is associated with a corresponding beam in the multiple beams according to rules stored in the UE.

[0120] In a second aspect, alone or in combination with the first aspect, each of the plurality of subsets is associated with a corresponding beam of the plurality of beams according to rules indicated by the message.

[0121] In a third aspect, alone or in combination with one or more of the first and second aspects, transmitting the at least one random access preamble comprises transmitting a plurality of random access preambles on random access occasions included within one of the plurality of subsets.

[0122] In a fourth aspect, alone or in combination with one or more of the first through third aspects, the plurality of random access preambles are copies of a same random access preamble.

[0123] In a fifth aspect, alone or in combination with one or more of the first through fourth aspects, the plurality of random access preambles are associated with each other.

[0124] In a sixth aspect, alone or in combination with one or more of the first through fifth aspects, the process 800 further includes receiving (e.g., using reception component 1002) an indication from the base station to repeat transmissions on random access occasions included within one of the plurality of subsets, such that transmitting the plurality of random access preambles is based at least in part on receiving the indication.

[0125] In a seventh aspect, alone or in combination with one or more of the first through sixth aspects, the indication is included in RMSI received from the base station.

[0126] In an eighth aspect, alone or in combination with one or more of the first through seventh aspects, transmitting the at least one random access preamble comprises transmitting a plurality of random access preambles on random access occasions included within different ones of the plurality of subsets.

[0127] In a ninth aspect, alone or in combination with one or more of the first through eighth aspects, the process 800 further includes transmitting (e.g., using transmission component 1004) an additional random access message to the base station, wherein transmitting the at least one random access preamble comprises transmitting one or more random access preambles on random access occasions included within one of the plurality of subsets, and transmitting the additional random access message using a same beam as used for the one or more random access preambles.

[0128] In the tenth aspect, either alone or in combination with one or more of the first to ninth aspects, process 800 further includes receiving (e.g., using receiving component 1002) a response to at least one random access preamble from a base station, and sending (e.g., using transmitting component 1004) an additional random access message to the base station, the additional random access message being transmitted using one or more corresponding beams indicated by the response to at least one random access preamble.

[0129] In the eleventh aspect, individually or in combination with one or more of the first to tenth aspects, multiple subsets differ from one or more subsets associated with a conventional UE.

[0130] although Figure 8 The example box for process 800 is shown, but in some respects, process 800 may include... Figure 8 The boxes shown are compared to more boxes, fewer boxes, different boxes, or boxes arranged differently. Additionally or alternatively, two or more boxes of process 800 can be executed in parallel.

[0131] Figure 9 This is a diagram illustrating an example process 900 performed, for example, by a base station according to this disclosure. Example process 900 is performed by a base station (e.g., Figure 11 An example of base station 110 and / or device 1100 performing operations associated with random access timing.

[0132] like Figure 9 As shown, in some aspects, process 900 may include sending data to the UE (e.g., Figure 10 The UE 120 and / or device 1000 send a message indicating multiple subsets within the random access timing set (box 910). For example, as described herein, the base station (e.g., using...) Figure 11 The transmitting component 1104 depicted can send a message to the UE indicating multiple subsets within a set of random access opportunities. In some respects, each subset of the multiple subsets is associated with a corresponding beam in a set of multiple beams, and each corresponding beam is different from the remaining beams in the set of multiple beams.

[0133] like Figure 9 As further illustrated herein, in some aspects, process 900 may include receiving at least one random access preamble from the UE based at least in part on the message (box 920). For example, as described herein, the base station (e.g., using...) Figure 11 The receiving component 1102 depicted in the image can receive at least one random access preamble from the UE, at least in part, based on the message. In some aspects, at least one random access preamble is received within one or more subsets of a plurality of beams, using one or more corresponding beams of a plurality of beams.

[0134] Process 900 can 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.

[0135] In a first aspect, each of the plurality of subsets is associated with a corresponding beam of the plurality of beams according to a rule stored in the base station.

[0136] In a second aspect, alone or in combination with the first aspect, each of the plurality of subsets is associated with a corresponding beam of the plurality of beams according to a rule indicated by the message.

[0137] In a third aspect, alone or in combination with one or more of the first and second aspects, receiving the at least one random access preamble comprises receiving a plurality of random access preambles on random access occasions included within one of the plurality of subsets.

[0138] In a fourth aspect, alone or in combination with one or more of the first through third aspects, the plurality of random access preambles are copies of a same random access preamble.

[0139] In a fifth aspect, alone or in combination with one or more of the first through fourth aspects, the plurality of random access preambles are associated with each other.

[0140] In a sixth aspect, alone or in combination with one or more of the first through fifth aspects, process 900 further includes transmitting (e.g., using transmission component 1104), to the UE, an indication to repeat transmissions on random access occasions included within one of the plurality of subsets, such that the plurality of random access preambles are received based at least in part on transmitting the indication.

[0141] In a seventh aspect, alone or in combination with one or more of the first through sixth aspects, the indication is included in RMSI transmitted to the UE.

[0142] In an eighth aspect, alone or in combination with one or more of the first through seventh aspects, receiving the at least one random access preamble comprises receiving a plurality of random access preambles on random access occasions included within different ones of the plurality of subsets.

[0143] In a ninth aspect, alone or in combination with one or more of the first through eighth aspects, process 900 further includes receiving (e.g., using reception component 1102), from the UE, an additional random access message, wherein receiving the at least one random access preamble comprises receiving one or more random access preambles on random access occasions included within one of the plurality of subsets, and receiving the additional random access message using a same beam as used for the one or more random access preambles.

[0144] In the tenth aspect, alone or in combination with one or more of the first to ninth aspects, process 900 further includes sending (e.g., using transmission component 1104) a response to at least one random access preamble to the UE, and receiving (e.g., using reception component 1102) an additional random access message from the UE, the additional random access message being received using a beam in one or more corresponding beams indicated by the response to at least one random access preamble.

[0145] In the eleventh aspect, individually or in combination with one or more of the first to tenth aspects, multiple subsets differ from one or more subsets associated with a conventional UE.

[0146] In the twelfth aspect, either alone or in combination with one or more of the first to eleventh aspects, process 900 further includes receiving (e.g., using receiving component 1102) an additional random access preamble from a conventional UE, the additional random access preamble being associated with a beam, and receiving at least one random access preamble and an additional random access preamble using a combination of a sub-beam and a beam associated with the additional random access preamble, at least in part based on one or more corresponding beams.

[0147] although Figure 9 This shows an example box of process 900, but in some respects, process 900 may include... Figure 9 The boxes shown are compared to more boxes, fewer boxes, different boxes, or boxes arranged differently. Additionally or alternatively, two or more boxes in process 900 can be executed in parallel.

[0148] Figure 10 This is a block diagram of an example device 1000 for wireless communication. Device 1000 may be a UE, or a UE may include device 1000. In some aspects, device 1000 includes a receiving component 1002 and a transmitting component 1004, which can communicate with each other (e.g., via one or more buses and / or one or more other components). As shown, device 1000 can use the receiving component 1002 and the transmitting component 1004 to communicate with another device 1006 (such as a UE, a base station, or another wireless communication device). As further shown, for example, device 1000 may include a random access message component 1008.

[0149] In some respects, device 1000 can be configured to perform the functions described herein. Figures 6 to 7 One or more operations described herein. Additionally or alternatively, the apparatus 1000 may be configured to perform one or more processes described herein, such as Figure 8 The process 800 or a combination thereof. In some respects, Figure 10 The device 1000 and / or one or more components shown may include the above combinations.Figure 2 one or more components of the described UE. Additionally or alternatively, Figure 10 one or more components shown in FIG. 13 can be implemented within the one or more components of the described UE. Additionally or alternatively, one or more components of the group of components can be implemented at least in part as software stored in a memory. For example, a component (or a portion of a component) can 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. Figure 2 one or more components of the described UE. Additionally or alternatively,

[0150] The reception component 1002 can receive communications, such as reference signals, control information, data communications, or a combination thereof, from the apparatus 1006. The reception component 1002 can provide received communications to one or more other components of the apparatus 1000. In some aspects, the reception component 1002 can 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 can provide the processed signals to the one or more other components of the apparatus 1000. In some aspects, the reception component 1002 can include one or more antennas, a demodulator, a MIMO detector, a receive processor, a controller / processor, a memory, or a combination thereof, of the UE described above in connection with FIG. 13. Figure 2 The reception component 1002 can receive communications, such as reference signals, control information, data communications, or a combination thereof, from the apparatus 1006. The reception component 1002 can provide received communications to one or more other components of the apparatus 1000. In some aspects, the reception component 1002 can 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 can provide the processed signals to the one or more other components of the apparatus 1000. In some aspects, the reception component 1002 can include one or more antennas, a demodulator, a MIMO detector, a receive processor, a controller / processor, a memory, or a combination thereof, of the UE described above in connection with FIG. 13.

[0151] The transmission component 1004 can transmit communications, such as reference signals, control information, data communications, or a combination thereof, to the apparatus 1006. In some aspects, one or more other components of the apparatus 1000 can generate communications and can provide the generated communications to the transmission component 1004 for transmission to the apparatus 1006. In some aspects, the transmission component 1004 can 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 can transmit the processed signals to the apparatus 1006. In some aspects, the transmission component 1004 can 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 UE described above in connection with FIG. 13. In some aspects, the transmission component 1004 can be co-located with the reception component 1002 in a transceiver. Figure 2 The transmission component 1004 can transmit communications, such as reference signals, control information, data communications, or a combination thereof, to the apparatus 1006. In some aspects, one or more other components of the apparatus 1000 can generate communications and can provide the generated communications to the transmission component 1004 for transmission to the apparatus 1006. In some aspects, the transmission component 1004 can 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 can transmit the processed signals to the apparatus 1006. In some aspects, the transmission component 1004 can 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 UE described above in connection with FIG. 13. In some aspects, the transmission component 1004 can be co-located with the reception component 1002 in a transceiver.

[0152] In some aspects, the reception component 1002 can receive, from the apparatus 1006, a message indicating a plurality of subsets within the set of random access occasions. Each of the plurality of subsets can be associated with a corresponding beam of the plurality of beams, and each corresponding beam can be different from a remaining beam of the plurality of beams. Thus, the transmission component 1004 can transmit, to the apparatus 1006, at least one random access preamble based at least in part on the message. For example, the random access message component 1008 can encode the at least one random access preamble for transmission by the transmission component 1004. In some aspects, the random access message component 1008 can include the reception component 1002, the transmission component 1004, and / or the processor 1020 of the UE described in connection with FIG. 1. Figure 2 The transmission component 1004, the reception component 1002, the processor 1020, the memory 1022, the modem, the MIMO processor, the controller / processor, or a combination thereof, of the described UE. The transmission component 1004 can transmit the at least one random access preamble within one or more of the plurality of subsets using one or more corresponding beams of the plurality of beams.

[0153] In some aspects, the reception component 1002 can further receive, from the apparatus 1006, an indication of a repeated transmission on a random access occasion included within one of the plurality of subsets. Thus, the transmission component 1004 can transmit a plurality of random access preambles on the random access occasion included within the one subset based at least in part on the reception component 1002 receiving the indication. Additionally, or alternatively, the transmission component 1004 can transmit the plurality of random access preambles on random access occasions included within different subsets.

[0154] In some aspects, the reception component 1002 can receive, from the apparatus 1006, a response to the at least one random access preamble. In some aspects, the transmission component 1004 can transmit an additional random access message to the apparatus 1006. The transmission component 1004 can transmit the additional random access message using a same beam as a beam used to transmit one or more random access preambles on a random access occasion included within one of the plurality of subsets. Alternatively, the transmission component 1004 can transmit the additional random access message using a beam of the one or more corresponding beams indicated by the response to the at least one random access preamble.

[0155] Figure 10 The number and arrangement of components shown in FIG. 10 are provided as an example. In practice, there can be additional components, fewer components, different components, or differently arranged components than those shown in FIG. 10. Additionally, or alternatively, Figure 10 components shown in FIG. 10 can be implemented within a single component, or multiple components can be implemented as a single component. Additionally, or alternatively, Figure 10 components shown in FIG. 10 can be implemented within a single component, or multiple components can be implemented as a single component. Additionally, or alternatively, Figure 10 components shown in FIG. 10 can be implemented within a single component, or multiple components can be implemented as a single component. Additionally, or alternatively, Figure 10 components shown in FIG. 10 can be implemented within a single component, or multiple components can be implemented as a single component. Additionally, or alternatively, Figure 10The other set of components shown performs one or more functions.

[0156] Figure 11 This is a block diagram of an example device 1100 for wireless communication. Device 1100 may be a base station, or a base station may include device 1100. In some aspects, device 1100 includes a receiving component 1102 and a transmitting component 1104, which can communicate with each other (e.g., via one or more buses and / or one or more other components). As shown, device 1100 can use the receiving component 1102 and the transmitting component 1104 to communicate with another device 1106 (such as a UE, a base station, or another wireless communication device). As further shown, for example, device 1100 may include a random access response component 1108.

[0157] In some respects, device 1100 can be configured to perform the functions described herein. Figures 6 to 7 One or more operations described herein. Additionally or alternatively, the apparatus 1100 may be configured to perform one or more processes described herein, such as Figure 9 The process 900 or a combination thereof. In some respects, Figure 11 The device 1100 and / or one or more components shown may include the above combination. Figure 2 One or more components of the described base station. Additionally or alternatively, Figure 11 One or more components shown can be combined as described above. Figure 2 Implemented within one or more of the described components. Additionally or alternatively, one or more components of the group of components may be implemented at least partially as software stored in 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, which may be executed by a controller or processor to perform the function or operation of the component.

[0158] Receiver 1102 may receive communications from device 1106, such as reference signals, control information, data communications, or combinations thereof. Receiver 1102 may provide the received communications to one or more other components of device 1100. In some aspects, receiver 1102 may perform signal processing on the received communications (such as filtering, amplification, demodulation, analog-to-digital conversion, demultiplexing, deinterleaving, demapping, equalization, interference cancellation, or decoding), and may provide the processed signal to one or more other components of device 1100. In some aspects, receiver 1102 may include combinations of the above. Figure 2 The described base station includes one or more antennas, demodulators, MIMO detectors, receiver processors, controllers / processors, memory, or combinations thereof.

[0159] The transmission component 1104 can transmit communications, such as reference signals, control information, data communications, or a combination thereof, to the apparatus 1106. In some aspects, one or more other components of the apparatus 1100 can generate communications and can provide the generated communications to the transmission component 1104 for transmission to the apparatus 1106. In some aspects, the transmission component 1104 can 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 can transmit the processed signals to the apparatus 1106. In some aspects, the transmission component 1104 can 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 base station described above in connection with Fig. 2. In some aspects, the transmission component 1104 can be co-located with the reception component 1102 in a transceiver. Figure 2 The transmission component 1104 can transmit communications, such as reference signals, control information, data communications, or a combination thereof, to the apparatus 1106. In some aspects, one or more other components of the apparatus 1100 can generate communications and can provide the generated communications to the transmission component 1104 for transmission to the apparatus 1106. In some aspects, the transmission component 1104 can 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 can transmit the processed signals to the apparatus 1106. In some aspects, the transmission component 1104 can 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 base station described above in connection with Fig. 2. In some aspects, the transmission component 1104 can be co-located with the reception component 1102 in a transceiver.

[0160] In some aspects, the transmission component 1104 can transmit, to the apparatus 1106, a message indicating a plurality of subsets within the set of random access occasions. Each subset of the plurality of subsets can be associated with a corresponding beam of the plurality of beams, and each corresponding beam can be different from a remaining beam of the plurality of beams. Accordingly, the reception component 1102 can receive, from the apparatus 1106, at least one random access preamble based at least in part on the message. The reception component 1102 can receive the at least one random access preamble within one or more subsets of the plurality of subsets using one or more corresponding beams of the plurality of beams.

[0161] In some aspects, the transmission component 1104 can transmit, to the apparatus 1106, an indication of a repeated transmission on a random access occasion included within one subset of the plurality of subsets. Accordingly, the reception component 1102 can receive a plurality of random access preambles on the random access occasion included within the one subset based at least in part on the transmission component 1104 transmitting the indication. Additionally, or alternatively, the reception component 1102 can receive the plurality of random access preambles on random access occasions included within different subsets.

[0162] In some aspects, the transmission component 1104 can transmit, to the apparatus 1106, a response to the at least one random access preamble. For example, the random access response component 1108 can encode the response for transmission by the transmission component 1104. In some aspects, the random access response component 1108 can include a modulator, a transmit MIMO processor, a transmit processor, a controller / processor, a memory, or a combination thereof, of the base station described above in connection with Fig. 2. Figure 11 In some aspects, the transmission component 1104 can transmit, to the apparatus 1106, a response to the at least one random access preamble. For example, the random access response component 1108 can encode the response for transmission by the transmission component 1104. In some aspects, the random access response component 1108 can include a modulator, a transmit MIMO processor, a transmit processor, a controller / processor, a memory, or a combination thereof, of the base station described above in connection with Fig. 2.

[0163] In some aspects, the reception component 1102 can receive an additional random access message from the apparatus 1106. The reception component 1102 can receive the additional random access message using a same beam as a beam used for receiving one or more random access preambles on a random access occasion, the random access occasion included within one of the multiple subsets. Alternatively, the reception component 1102 can receive the additional random access message using a beam of one or more corresponding beams indicated by a response to the at least one random access preamble.

[0164] In some aspects, the reception component 1102 can receive an additional random access preamble from a legacy apparatus (e.g., a legacy UE). Accordingly, the reception component 1102 can receive the additional random access preamble and the at least one random access preamble using a combination of a sub-beam and a beam associated with the additional random access preamble based at least in part on the one or more corresponding beams.

[0165] Figure 11 The number and arrangement of components shown in FIG. 12 are provided as an example. In practice, there can be additional components, fewer components, different components, or differently arranged components than those shown in FIG. 12. Additionally or alternatively, two or more components shown in FIG. 12 can be implemented within a single component, or a single component shown in FIG. 12 can be implemented as multiple, distributed components. Additionally or alternatively, a component recited as being configured to perform a particular function Figure 11 may have additional components, fewer components, different components, or differently arranged components than those shown in FIG. 11. Additionally or alternatively, two or more components shown in FIG. 11 can be implemented within a single component, or a single component shown in FIG. 11 can be implemented as multiple, distributed components. Additionally or alternatively, a component recited as being configured to perform a particular function can actually Figure 11 be configured to perform additional functions not recited. Figure 11 Additionally or alternatively, a component recited as being configured to perform one or more functions can actually Figure 11 be configured to perform fewer functions than those recited, or additional functions not recited. ​ Additionally or alternatively, a component recited as being configured to perform a particular function can actually be configured to perform the particular function recited and one or more additional functions at the same or different times.

[0166] An overview of some aspects of the present disclosure is provided below:

[0167] Aspect 1 : A method of wireless communication performed by a user equipment (UE), comprising: receiving, from a base station, a message indicating a plurality of subsets within a set of random access occasions, wherein each subset of the plurality of subsets is associated with a corresponding beam of a plurality of beams, wherein each corresponding beam is different from a remaining beam of the plurality of beams; and transmitting, to the base station, at least one random access preamble based at least in part on the message, wherein the at least one random access preamble is transmitted within one or more subsets of the plurality of subsets using one or more corresponding beams of the plurality of beams.

[0168] Aspect 2: The method of Aspect 1, wherein each subset of the plurality of subsets is associated with the corresponding beam of the plurality of beams according to a rule stored in the UE.

[0169] Aspect 3: The method of any of aspects 1-2, wherein each subset of the plurality of subsets is associated with a corresponding beam of the plurality of beams according to a rule indicated by the message.

[0170] Aspect 4: The method of any of aspects 1-3, wherein transmitting the at least one random access preamble comprises transmitting a plurality of random access preambles on random access occasions included within one of the plurality of subsets.

[0171] Aspect 5: The method of aspect 4, wherein the plurality of random access preambles are copies of a same random access preamble.

[0172] Aspect 6: The method of aspect 4, wherein the plurality of random access preambles are associated with each other.

[0173] Aspect 7: The method of any of aspects 4-6, further comprising receiving an indication from the base station to repeat transmissions on random access occasions included within one of the plurality of subsets, wherein transmitting the plurality of random access preambles is based at least in part on receiving the indication.

[0174] Aspect 8: The method of aspect 7, wherein the indication is included within remaining minimum system information (RMSI) received from the base station.

[0175] Aspect 9: The method of any of aspects 1-8, wherein transmitting the at least one random access preamble comprises transmitting a plurality of random access preambles on random access occasions included within different ones of the plurality of subsets.

[0176] Aspect 10: The method of aspect 9, wherein the plurality of random access preambles are copies of a same random access preamble.

[0177] Aspect 11: The method of aspect 9, wherein the plurality of random access preambles are associated with each other.

[0178] Aspect 12: The method of any of aspects 1-11, further comprising: transmitting an additional random access message to the base station, wherein transmitting the at least one random access preamble comprises transmitting one or more random access preambles on random access occasions included within one of the plurality of subsets, and wherein the additional random access message is transmitted using a same beam as a beam used for the one or more random access preambles.

[0179] Aspect 13: The method of any of aspects 1-12, further comprising: receiving, from the base station, a response to the at least one random access preamble; and transmitting, to the base station, an additional random access message, wherein the additional random access message is transmitted using a beam of the one or more corresponding beams indicated by the response to the at least one random access preamble.

[0180] Aspect 14: The method of any of aspects 1-13, wherein the plurality of subsets are different from one or more subsets associated with a legacy UE.

[0181] Aspect 15: A method of wireless communication performed by a base station, comprising: transmitting, to a user equipment (UE), a message indicating a plurality of subsets within a set of random access occasions, wherein each subset of the plurality of subsets is associated with a corresponding beam of a plurality of beams, wherein each corresponding beam is different from a remaining beam of the plurality of beams; and receiving, from the UE, at least one random access preamble based at least in part on the message, wherein the at least one random access preamble is received within one or more subsets of the plurality of subsets using one or more corresponding beams of the plurality of beams.

[0182] Aspect 16: The method of aspect 15, wherein each subset of the plurality of subsets is associated with a corresponding beam of the plurality of beams according to a rule stored in the base station.

[0183] Aspect 17: The method of any of aspects 15-16, wherein each subset of the plurality of subsets is associated with a corresponding beam of the plurality of beams according to a rule indicated by the message.

[0184] Aspect 18: The method of any of aspects 15-17, wherein receiving the at least one random access preamble comprises receiving a plurality of random access preambles on a random access occasion included within one of the plurality of subsets.

[0185] Aspect 19: The method of aspect 18, wherein the plurality of random access preambles are copies of a same random access preamble.

[0186] Aspect 20: The method of aspect 18, wherein the plurality of random access preambles are associated with each other.

[0187] Aspect 21: The method of any of aspects 18-20, further comprising: transmitting, to the UE, an indication to repeat a transmission on a random access occasion included within one of the plurality of subsets, wherein the plurality of random access preambles are received based at least in part on transmitting the indication.

[0188] Aspect 22: The method of aspect 21, wherein the indication is included within remaining minimum system information (RMSI) transmitted to the UE.

[0189] Aspect 23: The method of any one of aspects 15-22, wherein receiving the at least one random access preamble comprises receiving a plurality of random access preambles on random access occasions included within different ones of the plurality of subsets.

[0190] Aspect 24: The method of aspect 23, wherein the plurality of random access preambles are copies of a same random access preamble.

[0191] Aspect 25: The method of aspect 23, wherein the plurality of random access preambles are associated with each other.

[0192] Aspect 26: The method of any one of aspects 15-25, further comprising: receiving an additional random access message from the UE, wherein receiving the at least one random access preamble comprises receiving one or more random access preambles on a random access occasion included within one of the plurality of subsets, and wherein the additional random access message is received using a same beam as used for the one or more random access preambles.

[0193] Aspect 27: The method of any one of aspects 15-26, further comprising: transmitting a response to the at least one random access preamble to the UE; and receiving an additional random access message from the UE, wherein the additional random access message is received using a beam of the one or more corresponding beams indicated by the response to the at least one random access preamble.

[0194] Aspect 28: The method of any one of aspects 15-27, wherein the plurality of subsets are different from one or more subsets associated with a legacy UE.

[0195] Aspect 29: The method of any one of aspects 15-28, further comprising: receiving an additional random access preamble from a legacy UE, wherein the additional random access preamble is associated with a beam, and wherein the at least one random access preamble and the additional random access preamble are received using a combination of a sub-beam and the beam associated with the additional random access preamble based at least in part on the one or more corresponding beams.

[0196] Aspect 30: 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 of aspects 1-14.

[0197] Aspect 31 : A device for wireless communication, comprising a memory and one or more processors coupled to the memory, the one or more processors configured to perform the method of one or more of Aspects 1-14.

[0198] Aspect 32 : An apparatus for wireless communication, comprising at least one means for performing the method of one or more of Aspects 1-14.

[0199] Aspect 33 : 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 of Aspects 1-14.

[0200] Aspect 34 : 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 of Aspects 1-14.

[0201] Aspect 35 : 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 of Aspects 15-29.

[0202] Aspect 36 : A device for wireless communication, comprising a memory and one or more processors coupled to the memory, the one or more processors configured to perform the method of one or more of Aspects 15-29.

[0203] Aspect 37 : An apparatus for wireless communication, comprising at least one means for performing the method of one or more of Aspects 15-29.

[0204] Aspect 38 : 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 of Aspects 15-29.

[0205] Aspect 39 : 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 of Aspects 15-29.

[0206] The foregoing presentation is provided for illustrative purposes and is not intended to be exhaustive or to limit the aspects to the precise form disclosed. Various modifications and variations are possible in light of the above disclosure or from practicing the aspects, and embodiments can implement a variety of altematives to two specific embodiments described.

[0207] As used herein, the term “component” is intended to be broadly interpreted to encompass hardware and / or a combination of hardware and software. “Software” shall be broadly interpreted to mean instructions, a set of instructions, code, code segments, program code, programs, subprograms, software modules, applications, software applications, software packages, routines, subroutines, objects, executables, threads of execution, procedures, and / or functions, among other examples, whether referred to as software, firmware, middleware, microcode, hardware description language, or otherwise. As used herein, a processor is implemented in hardware and / or a combination of hardware and software. It will be apparent that systems and / or methods described herein can be implemented in different forms of hardware 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 — because it will be understood that software and hardware can be designed to implement the systems and / or methods, based on the description herein, without departing from the scope of the aspects.

[0208] As used herein, depending on the context, satisfying a threshold can 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.

[0209] While specific combinations of features are recited in the claims and / or disclosed in the specification, such combinations are not intended to limit the disclosure of aspects. Many combinations of features can be made without departing from the scope of the aspects. The disclosure of aspects includes each dependent claim in combination with every other claim in the claim set. As used herein, a phrase referring to “at least one of’ a list of items refers to any combination of those items, including single members. For 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 number of multiples of the same elements (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), and is intended to cover one, two, three, four, or five or more items from the list.

[0210] 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 can be used interchangeably with “one or more.” Furthermore, as used herein, the article “the” is intended to include one or more items, and can be used interchangeably with “the one or more.” Also, as used herein, the terms “set” and “group” are intended to include one or more items, and can 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,” or the like are intended to be open-ended terms that are inclusive of both the item being described and one or more additional items. Further, the phrase “based on” is intended to mean “based, at least in part, on” unless explicitly stated otherwise. Also, as used herein, the term “or” used in the context of a series of items is intended to be inclusive of one or more of the items in the series unless otherwise indicated (e.g., if used in the context of “one or the other” or “only one of the other”).

Claims

1. An apparatus for wireless communication at a user equipment (UE), comprising: a memory; and one or more processors coupled to the memory and configured to: receive, from a base station, a message indicating a plurality of subsets within a set of random access occasions, wherein each of the plurality of subsets includes a plurality of random access occasions and is associated with a corresponding beam of a plurality of beams, wherein each corresponding beam is different from a remaining beam of the plurality of beams; and transmit, to the base station, at least one random access preamble based at least in part on the message, wherein the at least one random access preamble is transmitted within one or more of the plurality of subsets using one or more corresponding beams of the plurality of beams.

2. The apparatus of claim 1, wherein each of the plurality of subsets is associated with the corresponding beam of the plurality of beams according to a rule stored in the UE.

3. The apparatus of claim 1, wherein each of the plurality of subsets is associated with the corresponding beam of the plurality of beams according to a rule indicated by the message.

4. The apparatus of claim 1, wherein the one or more processors, to transmit the at least one random access preamble, are configured to transmit a plurality of random access preambles on random access occasions included within one of the plurality of subsets.

5. The apparatus of claim 4, wherein the plurality of random access preambles are copies of a same random access preamble.

6. The apparatus of claim 4, wherein the plurality of random access preambles are associated with each other.

7. The apparatus of claim 4, wherein the one or more processors are further configured to: receive an indication, from the base station, to repeat transmission on random access occasions included within one of the plurality of subsets, wherein the plurality of random access preambles are transmitted based at least in part on receiving the indication.

8. The apparatus of claim 7, wherein the indication is included within remaining minimum system information (RMSI) received from the base station.

9. The apparatus of claim 1, wherein the one or more processors, to transmit the at least one random access preamble, are configured to transmit a plurality of random access preambles on random access occasions included within different ones of the plurality of subsets.

10. The apparatus of claim 9, wherein the plurality of random access preambles are copies of a same random access preamble.

11. The apparatus of claim 9, wherein the plurality of random access preambles are associated with each other.

12. The apparatus of claim 1, wherein the one or more processors are further configured to: transmit, to the base station, an additional random access message, wherein the one or more processors, to transmit the at least one random access preamble, are configured to transmit one or more random access preambles on random access occasions included within one of the plurality of subsets, and wherein the additional random access message is transmitted using a same beam as a beam used for the one or more random access preambles. ​ 13. The apparatus of claim 1, wherein the one or more processors are further configured to: receive, from the base station, a response to the at least one random access preamble; and transmit, to the base station, an additional random access message, wherein the additional random access message is transmitted using a beam of the one or more corresponding beams indicated by the response to the at least one random access preamble.

14. The apparatus of claim 1, wherein the plurality of subsets are different from one or more subsets associated with a legacy UE.

15. An apparatus for wireless communication at a base station, comprising: a memory; and one or more processors coupled to the memory and configured to: transmit, to a user equipment (UE), a message indicating a plurality of subsets within a set of random access occasions, wherein each subset of the plurality of subsets includes a plurality of random access occasions and is associated with a corresponding beam of a plurality of beams, wherein each corresponding beam is different from a remaining beam of the plurality of beams; and receive, from the UE, at least one random access preamble based at least in part on the message, wherein the at least one random access preamble is received within one or more subsets of the plurality of subsets using one or more corresponding beams of the plurality of beams.

16. The apparatus of claim 15, wherein each subset of the plurality of subsets is associated with a corresponding beam of the plurality of beams according to a rule stored in the base station.

17. The apparatus of claim 15, wherein each subset of the plurality of subsets is associated with a corresponding beam of the plurality of beams according to a rule indicated by the message.

18. The apparatus of claim 15, wherein the one or more processors configured to receive the at least one random access preamble are configured to receive a plurality of random access preambles on random access occasions included within one subset of the plurality of subsets.

19. The apparatus of claim 18, wherein the plurality of random access preambles are copies of a same random access preamble.

20. The apparatus of claim 18, wherein the plurality of random access preambles are associated with each other.

21. The apparatus of claim 18, wherein the one or more processors are further configured to: transmit, to the UE, an indication to repeat transmissions on random access occasions included within one subset of the plurality of subsets, wherein the plurality of random access preambles are received based at least in part on transmitting the indication.

22. The apparatus of claim 21, wherein the indication is included within remaining minimum system information (RMSI) transmitted to the UE.

23. The apparatus of claim 15, wherein the one or more processors configured to receive the at least one random access preamble are configured to receive a plurality of random access preambles on random access occasions included within different subsets of the plurality of subsets.

24. The apparatus of claim 23, wherein the plurality of random access preambles are copies of a same random access preamble.

25. The apparatus of claim 23, wherein the plurality of random access preambles are associated with one another.

26. The apparatus of claim 15, wherein the one or more processors are further configured to: receive, from the UE, an additional random access message, wherein the one or more processors, in receiving the at least one random access preamble, are configured to receive one or more random access preambles on random access occasions included within one of the plurality of subsets, and wherein the additional random access message is received using a same beam as a beam used for the one or more random access preambles.

27. The apparatus of claim 15, wherein the one or more processors are further configured to: transmit, to the UE, a response to the at least one random access preamble; and receive, from the UE, an additional random access message, wherein the additional random access message is received using a beam of the one or more corresponding beams indicated by the response to the at least one random access preamble.

28. The apparatus of claim 15, wherein the one or more processors are further configured to: receive, from a legacy UE, an additional random access preamble, wherein the additional random access preamble is associated with a beam, and wherein the at least one random access preamble and the additional random access preamble are received using a combination of the beam associated with the additional random access preamble and a sub-beam based at least in part on the one or more corresponding beams.

29. A method of wireless communication performed by a user equipment (UE), comprising: receiving, from a base station, a message indicating a plurality of subsets within a set of random access occasions, wherein each of the plurality of subsets includes a plurality of random access occasions and is associated with a corresponding beam of a plurality of beams, wherein each corresponding beam is different from a remaining beam of the plurality of beams; and transmitting, to the base station, at least one random access preamble based at least in part on the message, wherein the at least one random access preamble is transmitted within one or more of the plurality of subsets using one or more corresponding beams of the plurality of beams.

30. A method of wireless communication performed by a base station, comprising: transmitting, to a user equipment (UE), a message indicating a plurality of subsets within a set of random access occasions, wherein each of the plurality of subsets includes a plurality of random access occasions and is associated with a corresponding beam of a plurality of beams, wherein each corresponding beam is different from a remaining beam of the plurality of beams; and receiving, from the UE, at least one random access preamble based at least in part on the message, wherein the at least one random access preamble is received within one or more of the plurality of subsets using one or more corresponding beams of the plurality of beams.

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