PRACH repetitions using different beams

Abstract

The present disclosure provides systems, methods, and devices for wireless communication that support PRACH repetition using different beams. In a first aspect, a method of wireless communication includes determining that a first PRACH transmission occasion occurs during a first time period; determining that the second PRACH transmission occasion occurs during a second time period; based on determining that the first PRACH transmission occasion occurs during the first time period, transmitting a first PRACH transmission at the first PRACH transmission occasion using the first beam; and based on determining that the second PRACH transmission occasion occurs during the second time period, transmitting a second PRACH transmission at the second PRACH transmission occasion using the second beam, where the second PRACH transmission is a repetition of the first PRACH transmission. Other aspects and features are also claimed and described.

Description

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application claims the benefit of international patent application No. PCT / CN2022 / 120438, entitled “PRACH REPETITION USING DIFFERENT BEAMS”, filed on September 22, 2022, which is expressly incorporated herein by reference in its entirety. Technical Field

[0003] Aspects of the present disclosure relate generally to wireless communication systems, and more particularly to physical random access channel (PRACH) repetition transmissions.Some features may enable and provide improved communications, including using different beams for PRACH repetition transmissions. Background Art

[0004] Wireless communication networks are widely deployed to provide various communication services such as voice, video, packet data, messaging, broadcast, etc. These wireless networks may be multiple-access networks capable of supporting multiple users by sharing the available network resources. Such networks may be multiple-access networks capable of supporting communication for multiple users by sharing the available network resources.

[0005] A wireless communication network may include several components. These components may include wireless communication devices, such as a base station (or Node B) that may support communications for several user equipments (UEs). A UE may communicate with a base station via a downlink and an uplink. A downlink (or forward link) refers to a communication link from a base station to a UE, and an uplink (or reverse link) refers to a communication link from a UE to a base station.

[0006] The base station may send data and control information to the UE on the downlink, or receive data and control information from the UE on the uplink. On the downlink, the transmission from the base station may encounter interference caused by transmissions from neighboring base stations or other wireless radio frequency (RF) transmitters. On the uplink, the transmission from the UE may encounter interference from other UEs communicating with neighboring base stations or from uplink transmissions of other wireless RF transmitters. This interference may degrade performance on both the downlink and uplink.

[0007] As the demand for mobile broadband access continues to grow, the potential for interference and congested networks grows with more UEs accessing long-range wireless communication networks and more short-range wireless systems deployed in communities. Research and development continues to advance wireless technologies to not only meet the growing demand for mobile broadband access, but also to improve and enhance the user experience with mobile communications. Summary of the invention

[0008] The following summarizes some aspects of the present disclosure to provide a basic understanding of the technology discussed. This summary is not an exhaustive overview of all the expected features of the present disclosure, and is neither intended to identify the key or important elements of all aspects of the present disclosure, nor to delineate the scope of any or all aspects of the present disclosure. The sole purpose of this summary is to present some concepts of one or more aspects of the present disclosure in a summarized form as a prelude to more specific embodiments presented later.

[0009] In one aspect of the present disclosure, a method for wireless communication performed by a UE includes: determining that a first PRACH transmission opportunity occurs during a first time period, wherein the first time period is a first time period in which the UE is configured to use a first beam to transmit a PRACH transmission; determining that a second PRACH transmission opportunity occurs during a second time period, wherein the second time period is a second time period in which the UE is configured to use a second beam different from the first beam to transmit a PRACH transmission; based on determining that the first PRACH transmission opportunity occurs during the first time period, using the first beam to transmit a first PRACH transmission at the first PRACH transmission opportunity; and based on determining that the second PRACH transmission opportunity occurs during the second time period, using the second beam to transmit a second PRACH transmission at the second PRACH transmission opportunity, wherein the second PRACH transmission is a repetition of the first PRACH transmission.

[0010] In an additional aspect of the present disclosure, an apparatus (such as a UE) includes at least one processor and a memory coupled to the at least one processor. The at least one processor is configured to: determine that a first PRACH transmission opportunity occurs during a first time period, wherein the first time period is a first time period in which the apparatus is configured to use a first beam to transmit a PRACH transmission; determine that a second PRACH transmission opportunity occurs during a second time period, wherein the second time period is a second time period in which the apparatus is configured to use a second beam to transmit a PRACH transmission; based on determining that the first PRACH transmission opportunity occurs during the first time period, use the first beam to transmit a first PRACH transmission at the first PRACH transmission opportunity; and based on determining that the second PRACH transmission opportunity occurs during the second time period, use the second beam to transmit a second PRACH transmission at the second PRACH transmission opportunity, wherein the second PRACH transmission is a repetition of the first PRACH transmission.

[0011] In an additional aspect of the present disclosure, an apparatus (such as a UE) includes: a component for determining that a first PRACH transmission opportunity occurs during a first time period, wherein the first time period is a first time period in which the apparatus is configured to use a first beam to transmit a PRACH transmission; a component for determining that a second PRACH transmission opportunity occurs during a second time period, wherein the second time period is a second time period in which the apparatus is configured to use a second beam different from the first beam to transmit a PRACH transmission; a component for transmitting a first PRACH transmission at the first PRACH transmission opportunity based on determining that the first PRACH transmission opportunity occurs during the first time period using the first beam; and a component for transmitting a second PRACH transmission at the second PRACH transmission opportunity based on determining that the second PRACH transmission opportunity occurs during the second time period using the second beam, wherein the second PRACH transmission is a repetition of the first PRACH transmission.

[0012] In an additional aspect of the present disclosure, a method for wireless communication performed by a first network node (such as a base station) includes: determining a coherence time for a UE based on one or more transmission parameters of the UE; sending an indication of the coherence time to the UE; and after sending the indication of the coherence time, receiving a first PRACH transmission from the UE using a first beam at a first PRACH transmission opportunity.

[0013] In an additional aspect of the present disclosure, an apparatus (such as a first network node) includes at least one processor and a memory coupled to the at least one processor. The at least one processor is configured to: determine a coherence time for a UE based on one or more transmission parameters of the UE; send an indication of the coherence time to the UE; and after sending the indication of the coherence time, receive a first PRACH transmission from the UE using a first beam at a first PRACH transmission opportunity.

[0014] In additional aspects of the present disclosure, an apparatus (such as a first network node) includes: a component for determining a coherence time for a UE based on one or more transmission parameters of the UE; a component for sending an indication of the coherence time to the UE; and a component for receiving a first PRACH transmission from the UE using a first beam at a first PRACH transmission opportunity after sending the indication of the coherence time.

[0015] In additional aspects of the present disclosure, a non-transitory computer-readable medium stores instructions that, when executed by a processor, cause the processor to perform the operations described herein.

[0016] The features and technical advantages of examples according to the present disclosure have been outlined quite extensively above so that the following specific embodiments may be better understood. Additional features and advantages will be described below. The disclosed concepts and specific examples may be easily used as a basis for modifying or designing other structures for the same purpose of achieving the present disclosure. Such equivalent constructions do not depart from the scope of the appended claims. When considered in conjunction with the accompanying drawings, the characteristics of the concepts disclosed herein (both their organization and methods of operation) and the associated advantages will be better understood according to the following description. Each of the figures in the accompanying drawings is provided for the purpose of illustration and description, and not as a definition of limitations to the claims.

[0017] Although various aspects and specific implementations are described in this application by the illustration of some examples, it will be understood by those skilled in the art that additional specific implementations and use cases may be generated in many different arrangements and scenarios. The innovation described herein can be implemented across many different platform types, devices, systems, shapes, sizes, and packaging arrangements. For example, aspects and / or uses can be generated via integrated chip specific implementations and other devices based on non-module components (e.g., end-user devices, vehicles, communication equipment, computing equipment, industrial equipment, retail / purchase equipment, medical equipment, devices that enable artificial intelligence (AI), etc.). Although some examples may or may not specifically point to use cases or applications, the applicability of a wide range of described innovations may occur. The scope of specific implementations can be in the range from chip-level or modular components to non-modular, non-chip-level specific implementations, and further to the scope of aggregated, distributed or original equipment manufacturer (OEM) devices or systems in conjunction with one or more aspects of the described innovations. In some practical environments, the equipment in conjunction with the various aspects and features described may also necessarily include additional components and features for implementing and practicing the various aspects claimed and described. For example, the transmission and reception of wireless signals necessarily include multiple components for analog and digital purposes (e.g., hardware components including antennas, radio frequency (RF) chains, power amplifiers, modulators, buffers, processors, interleavers, adders / summers, etc.). The innovations described herein are intended to be practiced in a variety of devices, chip-level components, systems, distributed arrangements, end-user devices, etc., having different sizes, shapes, and configurations. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] A further understanding of the nature and advantages of the present disclosure may be achieved by reference to the following drawings. In the drawings, similar components or features may have the same reference label. In addition, various components of the same type may be distinguished by adding a dash and a second label to distinguish between similar components after the reference label. If only the first reference label is used in the specification, the description applies to any one of the similar components having the same first reference label, regardless of the second reference label.

[0019] Figure 1 is a block diagram illustrating details of an example wireless communication system in accordance with one or more aspects.

[0020] Figure 2 is a block diagram illustrating an example of a base station and a user equipment (UE) according to one or more aspects.

[0021] Figure 3 is a block diagram illustrating an example wireless communication system that supports PRACH repetition using different beams in accordance with one or more aspects.

[0022] Figure 4 is a timing diagram illustrating PRACH and Msg3 repetition using different beams according to one or more aspects.

[0023] Figure 5 is a flow chart illustrating an example process for supporting PRACH repetition using different beams in accordance with one or more aspects.

[0024] Figure 6 is a flow chart illustrating an example process for supporting PRACH repetition using different beams in accordance with one or more aspects.

[0025] Figure 7 is a flow chart illustrating an example process for supporting PRACH repetition using different beams in accordance with one or more aspects.

[0026] Figure 8 is a block diagram of an example base station supporting PRACH repetition using different beams according to one or more aspects.

[0027] Fig. 9 is a block diagram of an example UE supporting PRACH repetition using different beams according to one or more aspects.

[0028] The same reference numbers and designations in different drawings indicate the same elements. DETAILED DESCRIPTION

[0029] The specific embodiments described below in conjunction with the accompanying drawings are intended as descriptions of various configurations and are not intended to limit the scope of the present disclosure. Instead, the specific embodiments include specific details for providing a thorough understanding of the subject matter of the present invention. It will be apparent to those skilled in the art that these specific details are not required in every case, and in some instances, well-known structures and components are shown in block diagram form for clarity of presentation.

[0030] The present disclosure as a whole relates to providing or participating in authorized shared access between two or more wireless devices in one or more wireless communication systems (also referred to as wireless communication networks). In various specific implementations, the techniques and devices may be used in wireless communication networks, such as code division multiple access (CDMA) networks, time division multiple access (TDMA) networks, frequency division multiple access (FDMA) networks, orthogonal FDMA (OFDMA) networks, single carrier FDMA (SC-FDMA) networks, LTE networks, GSM networks, fifth generation (5G) or new radio (NR) networks (sometimes referred to as "5G NR" networks, systems or devices) and other communication networks. As described herein, the terms "network" and "system" may be used interchangeably.

[0031] A CDMA network may implement, for example, a radio technology such as Universal Terrestrial Radio Access (UTRA), cdma2000, etc. UTRA includes Wideband-CDMA (W-CDMA) and Low Chip Rate (LCR). CDMA2000 covers IS-2000, IS-95, and IS-856 standards.

[0032] For example, a TDMA network may implement a radio technology such as a Global System for Mobile Communications (GSM). The 3rd Generation Partnership Project (3GPP) defines the standards for the GSM EDGE (Enhanced Data Rate GSM Evolution) Radio Access Network (RAN) (also referred to as GERAN). GERAN is the radio component of the network of GSM / EDGE together with connecting base stations (e.g., Ater and Abis interfaces) and base station controllers (A interfaces, etc.). The radio access network represents the component of the GSM network through which telephone calls and packet data are routed from the Public Switched Telephone Network (PSTN) and the Internet to subscriber phones (also referred to as user terminals or user equipment (UE)) and from subscriber phones to the PSTN and the Internet. The network of a mobile phone operator may include one or more GERANs, which may be coupled to the UTRAN in the case of a UMTS / GSM network. Additionally, the operator network may also include one or more LTE networks, or one or more other networks. Various network types may use different radio access technologies (RATs) and RANs.

[0033] OFDMA network can implement radio technology such as Evolved UTRA (E-UTRA), Institute of Electrical and Electronics Engineers (IEEE) 802.11, IEEE 802.16, IEEE 802.20, flash-OFDM, etc. UTRA, E-UTRA and GSM are part of Universal Mobile Telecommunications System (UMTS). Specifically, Long Term Evolution (LTE) is a version of UMTS using E-UTRA. UTRA, E-UTRA, GSM, UMTS and LTE are described in documents provided by an organization named "3rd Generation Partnership Project" (3GPP), and cdma2000 is described in documents from an organization named "3rd Generation Partnership Project 2" (3GPP2). These radio technologies and standards are known or under development. For example, 3GPP is a collaboration between telecommunications association groups to define a globally applicable third generation (3G) mobile phone specification. 3GPP LTE is a 3GPP plan to improve the UMTS mobile phone standard. 3GPP can define the specifications of next generation mobile networks, mobile systems and mobile devices. The present disclosure may describe certain aspects with reference to LTE, 4G or 5G NR technology; however, the description is not intended to be limited to a particular technology or application, and one or more aspects described with reference to one technology may be understood to be applicable to another technology. Additionally, one or more aspects of the present disclosure may relate to shared access to wireless spectrum between networks using different radio access technologies or radio air interfaces.

[0034] 5G networks are expected to have diverse deployments, diverse spectrum, and diverse services and devices that can be implemented using a unified air interface based on OFDM. To achieve these goals, in addition to developing new radio technologies for 5G NR networks, further enhancements to LTE and LTE-A are also being considered. 5G NR will be able to expand to provide coverage: (1) Support massive Internet of Things (IoT) with ultra-high density (e.g., about 1M nodes / km) 2 ), ultra-low complexity (e.g., about 10s of bits / sec), ultra-low power consumption (e.g., about 10+ years of battery life), and deep coverage capable of reaching challenging locations; (2) includes mission-critical control with strong security for protecting sensitive personal, financial, or classified information, ultra-high reliability (e.g., about 99.9999% reliability), ultra-low latency (e.g., about 1 millisecond (ms)), and support for users with a wide range of mobility or no mobility; and (3) has enhanced mobile broadband, including extremely high capacity (e.g., about 10Tbps / km 2 ), extremely high data rates (e.g., multi-Gbps rates, 100+Mbps user experience rates), and deep perception with advanced discovery and optimization.

[0035] Devices, networks, and systems may be configured to communicate via one or more portions of the electromagnetic spectrum. The electromagnetic spectrum is typically subdivided into various categories, bands, channels, etc. based on frequency / wavelength. In 5G NR, two initial operating bands have been identified as frequency ranges designated FR1 (410 MHz-7.125 GHz) and FR2 (24.25 GHz-52.6 GHz). Frequencies between FR1 and FR2 are typically referred to as mid-band frequencies. Although a portion of FR1 is greater than 6 GHz, FR1 is often referred to (interchangeably) as the "below 6 GHz" band in various documents and articles. Similar naming issues sometimes arise for FR2, which is often (interchangeably) referred to as the "millimeter wave" (mmWave) band in documents and articles, although it is different from the extremely high frequency (EHF) band (30 GHz-300 GHz) identified as the "mmWave" band by the International Telecommunication Union (ITU).

[0036] In view of the above aspects, unless otherwise specifically stated, it should be understood that if the term "below 6 GHz" or the like is used in this document, it can broadly represent frequencies that may be less than 6 GHz, may be within FR1, or may include mid-band frequencies. In addition, unless otherwise specifically stated, it should be understood that if used in this document, the term "mmWave" or the like can broadly represent frequencies that may include mid-band frequencies, may be within FR2, or may be within the EHF band.

[0037] 5G NR devices, networks, and systems can be implemented using optimized OFDM-based waveform features. These features may include scalable parameter sets and transmission time intervals (TTIs); a common flexible framework that efficiently multiplexes services and features using dynamic, low-latency time division duplex (TDD) designs or frequency division duplex (FDD) designs; and advanced wireless technologies such as massive multiple-input multiple-output (MIMO), robust mmWave transmission, advanced channel decoding, and device-centric mobility. The scalability of parameter sets in 5G NR and the scaling of subcarrier spacing can efficiently address various services operating across different spectrums and different deployments. For example, in various outdoor and macro coverage deployments of less than 3GHz FDD or TDD implementations, the subcarrier spacing may appear at 15kHz, such as over bandwidths of 1MHz, 5MHz, 10MHz, 20MHz, etc. For various other outdoor and small cell coverage deployments of TDD greater than 3GHz, the subcarrier spacing may appear at 30kHz over 80MHz / 100MHz bandwidth. For various other indoor broadband implementations, using TDD on the unlicensed portion of the 5GHz band, the subcarrier spacing may occur at 60kHz over a 160MHz bandwidth. Finally, for various deployments transmitting over mmWave components at 28GHz TDD, the subcarrier spacing may occur at 120kHz over a 500MHz bandwidth.

[0038] 5G NR's scalable parameter set facilitates scalable TTI for diverse latency and quality of service (QoS) requirements. For example, shorter TTIs can be used for low latency and high reliability, while longer TTIs can be used for higher spectral efficiency. Efficient multiplexing of long and short TTIs allows transmission to start on symbol boundaries. 5G NR also anticipates a self-contained integrated subframe design in which uplink or downlink scheduling information, data, and acknowledgments are in the same subframe. The self-contained integrated subframe supports communications in unlicensed or contention-based shared spectrum, adaptive uplink or downlink (which can be flexibly configured on a per-cell basis to dynamically switch between uplink and downlink to meet current business needs).

[0039] For clarity, certain aspects of the devices and techniques may be described below with reference to example 5G NR implementations or in a 5G-centric manner, and 5G terminology may be used as illustrative examples in portions of the description below; however, the description is not intended to be limited to 5G applications.

[0040] Furthermore, it should be understood that in operation, a wireless communication network adapted according to the concepts herein can operate using any combination of licensed spectrum or unlicensed spectrum depending on load and availability. Therefore, it will be apparent to one of ordinary skill in the art that the systems, devices, and methods described herein can be applied to other communication systems and applications beyond the specific examples provided.

[0041] Although various aspects and specific implementations are described in this application by the illustration of some examples, it will be understood by those skilled in the art that additional specific implementations and use cases may be generated in many different arrangements and scenarios. The innovation described herein can be implemented across many different platform types, devices, systems, shapes, sizes, and packaging arrangements. For example, specific implementation or use can be implemented via integrated chip specific implementation or other devices based on non-module components (e.g., end-user devices, vehicles, communication equipment, computing equipment, industrial equipment, retail equipment or purchasing equipment, medical equipment, AI-enabled devices, etc.). Although some examples may or may not specifically point to use cases or applications, the applicability of a wide range of described innovations may occur. The scope of specific implementation can range from chip-level or modular components to non-modular, non-chip-level specific implementations, and further to aggregated, distributed, or original equipment manufacturer (OEM) devices or systems containing one or more described aspects. In some practical environments, the equipment in combination with the various aspects and features described may also necessarily include additional components and features for implementing and practicing the various aspects claimed and described. It is intended that the innovations described herein may be implemented in a wide variety of embodiments of different sizes, shapes, and configurations, including both large and small devices, chip-level components, multi-component systems (e.g., radio frequency (RF) chains, communication interfaces, processors), distributed arrangements, end-user devices, and the like.

[0042] Figure 1 1 is a block diagram illustrating details of an example wireless communication system according to one or more aspects. The wireless communication system may include a wireless network 100. The wireless network 100 may, for example, include a 5G wireless network. As will be appreciated by those skilled in the art, Figure 1 Components appearing in are likely to have related corresponding components in other network arrangements (including, for example, cellular-style network arrangements and non-cellular-style network arrangements (e.g., device-to-device or peer-to-peer or ad hoc network arrangements, etc.)).

[0043] Figure 1The illustrated wireless network 100 includes many base stations 105 and other network entities. A base station may be a station that communicates with a UE, and may also be referred to as an evolved Node B (eNB), a next generation eNB (gNB), an access point, etc. Each base station 105 may provide communication coverage for a specific geographic area. In 3GPP, the term "cell" may refer to a specific geographic coverage area of ​​a base station or a base station subsystem serving the coverage area, depending on the context in which the term is used. In the specific implementation of the wireless network 100 herein, the base station 105 may be associated with the same operator or different operators (e.g., the wireless network 100 may include multiple operator wireless networks). Additionally, in the specific implementation of the wireless network 100 herein, the base station 105 may provide wireless communication using one or more frequencies (e.g., one or more frequency bands in a licensed spectrum, an unlicensed spectrum, or a combination thereof) in the same frequency as an adjacent cell. In some examples, a separate base station 105 or UE 115 may be operated by more than one network operating entity. In other examples, each base station 105 and UE 115 may be operated by a single network operating entity.

[0044] A base station may provide communication coverage for a macro cell or a small cell (e.g., a pico cell or a femto cell), or other types of cells. A macro cell generally covers a relatively large geographic area (e.g., several kilometers in radius) and may allow unrestricted access by UEs with a service subscription with a network provider. A small cell (such as a pico cell) will generally cover a relatively small geographic area and may allow unrestricted access by UEs with a service subscription with a network provider. A small cell (such as a femto cell) will generally also cover a relatively small geographic area (e.g., a home), and in addition to unrestricted access, may also provide restricted access by UEs associated with the femto cell (e.g., UEs in a closed subscriber group (CSG), UEs of users in a home, etc.). A base station for a macro cell may be referred to as a macro base station. A base station for a small cell may be referred to as a small cell base station, a pico base station, a femto base station, or a home base station. In Figure 1 In the example shown, base stations 105d and 105e are conventional macro base stations, while base stations 105a-105c are macro base stations implemented using one of 3-dimensional (3D), full-dimensional (FD) or massive MIMO. Base stations 105a-105c use their higher-dimensional MIMO capabilities to employ 3D beamforming in elevation and azimuth beamforming to increase coverage and capacity. Base station 105f is a small cell base station, which can be a home node or a portable access point. The base station can support one or more (e.g., two, three, four, etc.) cells.

[0045] Wireless network 100 may support synchronous or asynchronous operation. For synchronous operation, base stations may have similar frame timings, and transmissions from different base stations may be approximately aligned in time. For asynchronous operation, base stations may have different frame timings, and transmissions from different base stations may not be aligned in time. In some cases, the network may be enabled or configured to handle dynamic switching between synchronous or asynchronous operation.

[0046] UE 115 is dispersed throughout the wireless network 100, and each UE may be stationary or mobile. It should be understood that, although in the standards and specifications promulgated by 3GPP, mobile devices are generally referred to as UEs, such devices may be additionally or otherwise referred to as mobile stations (MS), subscriber stations, mobile units, subscriber units, wireless units, remote units, mobile devices, wireless devices, wireless communication devices, remote devices, mobile subscriber stations, access terminals (AT), mobile terminals, wireless terminals, remote terminals, mobile phones, terminals, user agents, mobile clients, clients, gaming devices, augmented reality devices, vehicle components, vehicle devices or vehicle modules or some other suitable terminology by those skilled in the art. In this document, a "mobile" device or UE does not necessarily have the ability to move and may be fixed. Some non-limiting examples of mobile devices (for example) may include one or more specific implementations of UE 115, including mobile phones, cellular phones, smart phones, session initiation protocol (SIP) phones, wireless local loop (WLL) stations, laptops, personal computers (PCs), notebooks, netbooks, smart books, tablet computers, and personal digital assistants (PDAs). The mobile device may additionally be an IoT or "Internet of Everything" (IoE) device, such as a car or other transportation vehicle, a satellite radio, a global positioning system (GPS) device, a global navigation satellite system (GNSS) device, a logistics controller, a drone, a multi-rotor helicopter, a quad-rotor helicopter, a smart energy or security device, a solar panel or solar array, city lighting, tap water or other infrastructure; industrial automation and enterprise equipment; consumer and wearable devices, such as glasses, wearable cameras, smart watches, health or fitness trackers, mammal implantable devices, gesture tracking devices, medical devices, digital audio players (e.g., MP3 players), cameras, game consoles, etc.; and digital home or smart home devices, such as home audio, video and multimedia devices, appliances, sensors, vending machines, smart lighting, home security systems, smart meters, etc. In one aspect, a UE may be a device including a universal integrated circuit card (UICC). In another aspect, a UE may be a device that does not include a UICC. In some aspects, a UE that does not include a UICC may also be referred to as an IoE device. Figure 1The UE 115a-115d of the specific implementation illustrated in the figure are examples of mobile smart phone type devices accessing the wireless network 100. The UE may also be a machine specially configured for connected communications (including machine type communications (MTC), enhanced MTC (eMTC), narrowband IoT (NB-IoT), etc.). Figure 1 The UEs 115e-115k illustrated in FIG. 1 are examples of various machines configured for communication that access the wireless network 100.

[0047] A mobile device, such as UE 115, may be able to communicate with any type of base station, whether macro, pico, femto, relay, etc. Figure 1 In the figure, the communication link (represented as a lightning ball) indicates the wireless transmission between the UE and the serving base station (the serving base station is a base station designated to serve the UE on the downlink or uplink) or the expected transmission between the base stations and the backhaul transmission between the base stations. The UE can operate as a base station or other network node in some scenarios. The backhaul communication between the base stations of the wireless network 100 can be carried out using a wired or wireless communication link.

[0048] In operation, at the wireless network 100, base stations 105a-105c use 3D beamforming and collaborative spatial techniques (e.g., coordinated multipoint (CoMP) or multi-connectivity) to serve UEs 115a and 115b. Macro base station 105d performs backhaul communications with base stations 105a-105c and small cells (base station 105f). Macro base station 105d also transmits multicast services that are subscribed to and received by UEs 115c and 115d. Such multicast services may include mobile TV or streaming video, or may include other services for providing community information, such as weather emergencies or alerts, such as Amber alerts or gray alerts.

[0049] The wireless network 100 of the specific implementation supports mission critical communications with ultra-reliable and redundant links for mission critical devices such as UE 115e as drones. The redundant communication links with UE 115e include links from macro base stations 105d and 105e and small cell base station 105f. Other machine type devices such as UE 115f (thermometer), UE 115g (smart meter) and UE 115h (wearable device) can communicate directly with base stations such as small cell base station 105f and macro base station 105e through the wireless network 100, or in a multi-hop configuration by communicating with another user device that relays its information to the network, such as UE 115f communicating temperature measurement information to smart meter UE 115g, which then reports it to the network through small cell base station 105f. The wireless network 100 may also provide additional network efficiency through dynamic, low-latency TDD communications or low-latency FDD communications (eg, in a vehicle-to-vehicle (V2V) mesh network between UEs 115i-115k communicating with a macro base station 105e).

[0050] Figure 2 1 is a block diagram illustrating an example of a base station 105 and a UE 115 according to one or more aspects. The base station 105 and the UE 115 may be Figure 1 For a restricted association scenario (as described above), base station 105 may be any of the base stations in the UE and one of the UEs. Figure 1 The small cell base station 105f in the example of FIG. 105 and the UE 115 may be a UE 115c or 115d operating in the service area of ​​the base station 105f, which will be included in the list of accessible UEs of the small cell base station 105f in order to access the small cell base station 105f. The base station 105 may also be some other type of base station. Figure 2 As shown in FIG. 1 , the base station 105 may be equipped with antennas 234a through 234t and the UE 115 may be equipped with antennas 252a through 252r for facilitating wireless communication.

[0051] At the base station 105, the transmit processor 220 may receive data from the data source 212 and control information from the controller 240 (such as a processor). The control information may be for a physical broadcast channel (PBCH), a physical control format indicator channel (PCFICH), a physical hybrid ARQ (automatic repeat request) indicator channel (PHICH), a physical downlink control channel (PDCCH), an enhanced physical downlink control channel (EPDCCH), an MTC physical downlink control channel (MPDCCH), etc. The data may be for a physical downlink shared channel (PDSCH), etc. Additionally, the transmit processor 220 may process (e.g., encode and symbol map) the data and the control information, respectively, to obtain data symbols and control symbols. The transmit processor 220 may also generate reference symbols, such as for a primary synchronization signal (PSS) and a secondary synchronization signal (SSS), and a cell-specific reference signal. The transmit (TX) MIMO processor 230 may perform spatial processing (e.g., pre-coding) on ​​data symbols, control symbols, or reference symbols, if applicable, and may provide an output symbol stream to modulators (MODs) 232a to 232t. For example, the spatial processing performed on the data symbols, control symbols, or reference symbols may include pre-coding. Each modulator 232 may process a corresponding output symbol stream (e.g., for OFDM, etc.) to obtain an output sample stream. Additionally or alternatively, each modulator 232 may process the output sample stream (e.g., analog-convert, amplify, filter, and up-convert it) to obtain a downlink signal. The downlink signals from modulators 232a to 232t may be transmitted via antennas 234a to 234t, respectively.

[0052] At the UE 115, antennas 252a to 252r may receive downlink signals from the base station 105 and may provide received signals to demodulators (DEMODs) 254a to 254r, respectively. Each demodulator 254 may condition (e.g., filter, amplify, downconvert, and digitize) a corresponding received signal to obtain input samples. Each demodulator 254 may further process the input samples (e.g., for OFDM, etc.) to obtain received symbols. The MIMO detector 256 may obtain received symbols from the demodulators 254a to 254r, perform MIMO detection on the received symbols when necessary, and provide detected symbols. The receive processor 258 may process (e.g., demodulate, deinterleave, and decode) the detected symbols, provide decoded data for the UE 115 to the data sink 260, and provide decoded control information to the controller 280 (e.g., a processor).

[0053] On the uplink, at the UE 115, the transmit processor 264 may receive and process data from a data source 262 (e.g., for a physical uplink shared channel (PUSCH)) and control information from a controller 280 (e.g., for a physical uplink control channel (PUCCH)). Additionally, the transmit processor 264 may also generate reference symbols for reference signals. The symbols from the transmit processor 264 may be pre-decoded by the TX MIMO processor 266, if necessary, further processed by the modulators 254a through 254r (e.g., for SC-FDM, etc.), and transmitted to the base station 105. At the base station 105, the uplink signal from the UE 115 may be received by the antenna 234, processed by the demodulator 232, detected by the MIMO detector 236, if necessary, and further processed by the receive processor 238 to obtain decoded data and control information transmitted by the UE 115. Receive processor 238 may provide the decoded data to a data sink 239 and the decoded control information to controller 240 .

[0054] The controllers 240 and 280 may direct the operation at the base station 105 and the UE 115, respectively. The controller 240 or other processors and modules at the base station 105 or the controller 280 or other processors and modules at the UE 115 may perform or direct the execution of various processes for the techniques described herein, such as to perform or direct the execution of various processes for the techniques described herein. Figures 5 to 7 2 and 3. The memory 242 and 282 may store data and program codes for the base station 105 and the UE 115, respectively. The scheduler 244 may schedule the UE to transmit data on the downlink or uplink.

[0055] In some cases, the UE 115 and the base station 105 may operate in a shared radio spectrum band, which may include licensed or unlicensed (e.g., contention-based) spectrum. In the unlicensed frequency portion of the shared radio spectrum band, the UE 115 or the base station 105 may traditionally perform a medium sensing process to compete for access to the spectrum. For example, the UE 115 or the base station 105 may perform a listen-before-talk or listen-before-send (LBT) process (such as a clear channel assessment (CCA)) before communicating to determine whether the shared channel is available. In some specific implementations, the CCA may include an energy detection process to determine whether there are any other active transmissions. For example, the device may infer that a change in the received signal strength indicator (RSSI) of the power meter indicates that the channel is occupied. Specifically, the signal power concentrated in a certain bandwidth and exceeding a predetermined noise floor may indicate another wireless transmitter. CCA may also include detection of a specific sequence indicating the use of the channel. For example, another device may send a specific preamble before sending a data sequence. In some cases, the LBT process may include the wireless node adjusting its own backoff window based on the amount of energy detected on the channel or acknowledgement / negative acknowledgement (ACK / NACK) feedback for its own transmitted packets (as a manifestation of a collision).

[0056] A UE may send a physical random access channel (PRACH) transmission (such as a random access preamble) to one or more network nodes (such as one or more base stations) to synchronize uplink transmissions between the respective UEs and the network nodes. The PRACH transmission may be repeated one or more times to provide greater reception reliability. For example, the PRACH transmission may be repeated two, three, four, or more times. A PRACH transmission including a first PRACH transmission and one or more repetitions of the first PRACH transmission may be sent using different beams to provide greater reception reliability, reduced interference, and reduced energy usage.

[0057] PRACH transmissions may be used to synchronize uplink transmissions. For example, in a contention-based random access channel (RACH) procedure (such as a four-step RACH procedure), a base station that receives one or more PRACH transmissions from a UE (such as one or more random access preambles or message one (Msg1) transmissions) may respond to receiving the PRACH transmission by sending a message two (Msg2) response to the PRACH transmission to the sending UE. The Msg2 response may include resource allocations for the UE to use when sending information to the base station. Upon receiving the Msg2 response, the UE may send one or more Msg3 repetitions to the base station based on receiving the Msg2 response. Thus, the repeated PRACH transmissions may allow the UE to synchronize with the base station to send scheduled UL transmissions, such as Msg3 transmissions.

[0058] The UE may use different beams to send a PRACH transmission set including a first PRACH transmission and one or more repetitions of the first PRACH transmission, and an Msg3 transmission set including a first Msg3 transmission and one or more repetitions of the first Msg3 transmission. For example, the UE may use a first beam to send a first PRACH transmission and a second PRACH transmission, wherein the second PRACH transmission is a repetition of the first PRACH transmission. The UE may use a second beam different from the first beam to send a third PRACH transmission and a fourth PRACH transmission, wherein the third PRACH transmission and the fourth PRACH transmission are repetitions of the first PRACH transmission. The first PRACH transmission, the second PRACH transmission, the third PRACH transmission, and the fourth PRACH transmission may, for example, be a PRACH transmission set.

[0059] Using different beams to send sets of repeated PRACH transmissions and repeated Msg3 transmissions can enhance reliability. For example, a first beam used to send a first set of PRACH transmissions may have a first beam direction, and a second beam used to send a second set of PRACH transmissions may have a second beam direction. The first beam with the first beam direction may, for example, have a first transmit control information (TCI) state or a quasi-co-location (QCL) state, and the second beam with the second beam direction may have a second TCI state or QCL state that is different from the first TCI state or QCL state. Using different beams may include using different uplink spatial filtering configurations for PRACH transmissions and Msg3 transmissions.

[0060] When determining which PRACH transmissions should be sent using the same beam, the UE may use a time period for sending PRACH transmissions using a specific beam. For example, the UE may be configured to send a PRACH transmission set including a first PRACH transmission and one or more repetitions of the first PRACH transmission at multiple PRACH transmission opportunities. The UE may determine that one or more PRACH transmission opportunities for sending a PRACH transmission and a repetition of the PRACH transmission occur during a first time period, wherein the first time period is a first time period in which the UE is configured to send a PRACH transmission using a first beam. For example, the first time period may be a first time period for sending a PRACH transmission using a first beam at a PRACH opportunity during the first time period. The UE may further determine that one or more PRACH transmission opportunities for sending a repetition of the first PRACH transmission occur during a second time period, wherein the second time period is a second time period in which the UE is configured to send a PRACH transmission using a second beam different from the first beam. For example, the second time period may be a second time period for sending a PRACH transmission using a second beam at a PRACH opportunity during the second time period. PRACH transmission opportunities that occur in a certain time period may be referred to as a PRACH transmission opportunity bundle, and may all be transmitted using the same beam. Thus, for example, if two PRACH transmission opportunities occur during a first time period for transmitting a PRACH transmission using a first beam, and two PRACH transmission opportunities occur during a second time period for transmitting a PRACH transmission using a second beam, the PRACH transmissions of the PRACH transmission opportunities may be transmitted using the corresponding beams associated with the corresponding time periods. In some embodiments, such time periods may be determined to transmit PRACH transmissions in a four-step RACH process or other RACH process. In some embodiments, such time periods may be determined to transmit PRACH transmissions using a FR2 frequency band (such as a 60kHz to 120kHz frequency band) or a FR1 frequency band (such as a 15kHz to 30kHz frequency band). In addition, such time periods may be determined to transmit PRACH transmissions using PRACH format B4, short physical uplink control channel PRACH formats, and other PRACH formats.

[0061] The coherence time may be used to determine a time period for using a specific beam when sending a PRACH transmission. The coherence time may be a duration during which the same beam should be used to send a PRACH transmission and a repetition of the PRACH transmission. Using the coherence time may reduce interference while enhancing the reliability of receiving the PRACH transmission. For example, the coherence time may be determined based on the frequency range of the UE sending the PRACH transmission, the frequency band of the UE sending the PRACH transmission, the PRACH format of the UE sending the PRACH transmission, or the time domain window (TDW) for demodulation reference signal (DMRS) bundling of the UE sending the PRACH transmission. Thus, for example, the UE may determine the coherence time, and may determine, based on the coherence time, a first time period, a second time period, and (in some embodiments) an additional time period for using different beams when sending a PRACH transmission and one or more repetitions of the PRACH transmission. For example, the duration of the first time period, the second time period, and any additional time period may be equal to the duration of the coherence time. In some embodiments, the first time period may start at the beginning of the transmission of the initial PRACH transmission, and the second time period may start at the end of the first time period. Thus, the first time period may be a first instance of coherence time and the second time period may be a second instance of coherence time. For example, a first beam may be used to transmit any PRACH transmissions that occur during a first instance of coherence time, and a second beam may be used to transmit any PRACH transmissions that occur during a second instance of coherence time that immediately follows the first instance of coherence time. In some embodiments, additional instances of coherence time may correspond to additional sequential time periods for additional beams. Thus, the coherence time for a UE may be used to determine a beam for transmitting a PRACH transmission and a repetition of the PRACH transmission.

[0062] Figure 3 is a block diagram of an example wireless communication system 300 that supports PRACH repetition using different beams according to one or more aspects. In some examples, the wireless communication system 300 can implement aspects of the wireless network 100. The wireless communication system 300 includes a UE 115 and a base station 105. Although one UE 115 and one base station 105 are illustrated, in some other implementations, the wireless communication system 300 can generally include multiple UEs 115 and can include more than one base station 105.

[0063] UE 115 may include various components (such as structural components, hardware components) for performing one or more functions described herein. For example, these components may include one or more processors 302 (hereinafter collectively referred to as "processor 302"), one or more memory devices 304 (hereinafter collectively referred to as "memory 304"), one or more transmitters 316 (hereinafter collectively referred to as "transmitters 316"), and one or more receivers 318 (hereinafter collectively referred to as "receivers 318"). Processor 302 may be configured to execute instructions stored in memory 304 to perform the operations described herein. In some specific implementations, processor 302 includes one or more of receiving processor 258, transmitting processor 264, and controller 280 or corresponds to one or more of the receiving processor, the transmitting processor, and the controller, and memory 304 includes or corresponds to memory 282.

[0064] The memory 304 includes PRACH timing information 305 or is configured to store the PRACH timing information. The PRACH timing information 305 may, for example, include one or more times of one or more PRACH transmission opportunities. For example, the PRACH timing information 305 may include one or more times of one or more PRACH transmission opportunities for sending a PRACH transmission (such as a random access preamble or a Msg1 transmission) and one or more repetitions of the PRACH transmission. The memory 304 includes beam information 306 or is configured to store the beam information. The beam information 306 may, for example, include information about one or more beams to be used when sending a PRACH transmission, one or more repetitions of the PRACH transmission, an Msg3 transmission, or one or more repetitions of the Msg3 transmission. The beam information 306 may, for example, include information about the direction of one or more beams, such as TCI state information for one or more beams, QCL state information for one or more beams, uplink spatial filtering configuration for one or more beams, or other information for one or more beams. The memory 304 includes beam use time period information 307 or is configured to include the beam use time period information. The beam use time period information 307 may, for example, include one or more time periods for sending PRACH transmissions using one or more beams. For example, the beam use time period information 307 may include a first time period for sending PRACH transmissions using a first beam and a second time period for sending PRACH transmissions using a second beam. The beam use time period information 307 may, for example, include information about specific PRACH transmission opportunities that occur during a specific time period for PRACH transmissions using a specific beam. The beam use time period information 307 may also include one or more coherence times for the UE 115, such as one or more coherence times determined by the UE 115 or the base station 105. The memory 304 includes Msg3 transmission information 308 or is configured to include the Msg3 transmission information. The Msg3 transmission information 308 may include the number of Msg3 transmissions to be transmitted by the UE 115 (such as the number of Msg3 transmissions including the first Msg3 transmission and one or more repetitions of the Msg3 transmission) and timing information for the Msg3 transmission. The Msg3 transmission information 308 may include scheduling information for the Msg3 transmissions to be transmitted by the UE 115, received from the base station 105 in the Msg2 transmission. The memory 304 includes a beam usage determination module 309 or is configured to include the beam usage determination module. The beam usage determination module 309 may include instructions for determining a time period for transmitting a PRACH transmission (such as a PRACH transmission and one or more repetitions of the PRACH transmission) using different beams. Such instructions may, for example, include instructions for determining a time period for using different beams based on a coherence time.The beam usage determination module 309 may also include instructions for determining which PRACH transmission opportunities for sending PRACH transmissions and repetitions of the PRACH transmissions occur during a particular time period, and therefore which beams should be used to send PRACH transmissions at particular PRACH transmission opportunities. The beam usage determination module 309 may also include instructions for determining one or more beams to use when sending one or more Msg3 transmissions (such as an Msg3 transmission and one or more repetitions of the Msg3 transmission). Such instructions may, for example, include instructions for determining one or more beams to use when sending one or more Msg3 transmissions, the determination being based on the total number of Msg3 transmissions (including Msg3 transmissions and one or more repetitions of the Msg3 transmissions) to be sent in response to one or more PRACH transmissions.

[0065] The transmitter 316 is configured to send reference signals, control information, and data to one or more other devices, and the receiver 318 is configured to receive reference signals, synchronization signals, control information, and data from one or more other devices. For example, the transmitter 316 may send signaling, control information, and data to the base station 105, and the receiver 318 may receive signaling, control information, and data from the base station. In some implementations, the transmitter 316 and the receiver 318 may be integrated into one or more transceivers. Additionally or alternatively, the transmitter 316 or the receiver 318 may include a reference signal. Figure 2 One or more components of the UE 115 are described or correspond to the one or more components.

[0066] The base station 105 may include various components (such as structural components, hardware components) for performing one or more functions described herein. For example, these components may include one or more processors 352 (hereinafter collectively referred to as "processor 352"), one or more memory devices 354 (hereinafter collectively referred to as "memory 354"), one or more transmitters 356 (hereinafter collectively referred to as "transmitters 356"), and one or more receivers 358 (hereinafter collectively referred to as "receivers 358"). The processor 352 may be configured to execute instructions stored in the memory 354 to perform the operations described herein. In some specific implementations, the processor 352 includes one or more of the receiving processor 238, the transmitting processor 220, and the controller 240 or corresponds to one or more of the receiving processor, the transmitting processor, and the controller, and the memory 354 includes the memory 242 or corresponds to the memory.

[0067] The memory 354 includes beam information 360 or is configured to store the beam information. The beam information 360 may include information about one or more beams on which the UE 115 will send a PRACH transmission (such as a random access preamble or a Msg1 transmission) to the base station 105, or about one or more beams on which the UE 115 will send one or more Msg3 transmissions to the base station 105. The memory 354 includes beam use time period information 361 or is configured to store the beam use time period information. The beam use time period information 361 may include information about one or more time periods for the UE 115 to send PRACH transmissions using different beams. The beam use time period information 361 may include one or more coherence times for the UE 115. The beam use time period information 361 may include information for use by the beam use time period determination module 363 in determining the beam use time period or coherence time, such as the frequency range of the UE 115, the frequency band of the UE 115, the PRACH format used by the UE 115 to send the PRACH transmission, or the TDW of the UE 115 for DMRS bundling. The memory 354 includes Msg3 transmission information 362 or is configured to store the Msg3 transmission information. The Msg3 transmission information 362 may, for example, include information about the number of Msg3 transmissions (such as Msg3 transmissions and one or more repetitions of the Msg3 transmissions) to be sent by the UE 115 in response to the Msg2 transmission by the base station 105. The memory 354 includes the beam use time period determination module 363 or is configured to include the beam use time period determination module. The beam use time period determination module 363 may, for example, include instructions for determining a time period for the UE 115 to use a specific beam to send a PRACH transmission. For example, the beam use time period determination module 363 may include instructions for determining a first time period for PRACH transmission using a first beam, a second time period for PRACH transmission using a second beam, and (in some embodiments) an additional time period for PRACH transmission using an additional beam. Such time periods may be time periods during which the UE is configured to use the corresponding beam to transmit PRACH transmissions. In some embodiments, the beam use time period determination module 363 may include instructions for determining one or more coherence times for UE 115. In some embodiments, the beam use time period determination module 363 may include instructions for determining the coherence time for the UE based on the frequency range of the UE 115, the frequency band of the UE 115, the PRACH format used by the UE 115 to transmit the PRACH transmission, or the TDW of the UE 115 for DMRS bundling.

[0068] The transmitter 356 is configured to send reference signals, synchronization signals, control information, and data to one or more other devices, and the receiver 358 is configured to receive reference signals, control information, and data from one or more other devices. For example, the transmitter 356 may send signaling, control information, and data to the UE 115, and the receiver 358 may receive signaling, control information, and data from the UE. In some implementations, the transmitter 356 and the receiver 358 may be integrated into one or more transceivers. Additionally or alternatively, the transmitter 356 or the receiver 358 may include a reference signal. Figure 2 One or more components of the base station 105 are described or correspond to the one or more components.

[0069] In some implementations, the wireless communication system 300 implements a 5G NR network. For example, the wireless communication system 300 may include a plurality of 5G-capable UEs 115 and a plurality of 5G-capable base stations 105, such as UEs and base stations configured to operate according to a 5G NR network protocol, such as defined by 3GPP.

[0070] During operation of the wireless communication system 300, the base station 105 may send a beam use period transmission 370 to the UE 115. The beam use period transmission 370 may include the beam use period information 361. For example, the base station 105 may determine a coherence time for the UE 115 and may send an indication of the coherence time in the beam use period transmission 370. The beam use period transmission 370 may be a system information block one (SIB1) transmission or a radio resource control (RRC) transmission. The base station 105 may also send a Msg3 transmission 372, which may include Msg3 transmission information 662. The Msg3 transmission 372 may, for example, include scheduling information for one or more Msg3 transmissions to be sent in response to the Msg3 information transmission 372, or may include the number of Msg3 transmissions to be sent in response to the Msg3 information transmission 372, such as the number of Msg3 transmissions and one or more repetitions of the Msg3 transmission. The Msg3 information transmission 372 may be, for example, a Msg2 transmission sent by the base station 105 in response to receiving one or more PRACH transmissions (such as one or more random access preambles or Msg1 transmissions) from the UE 115.

[0071] The UE 115 may transmit a first PRACH transmission 380 using the first beam at a first PRACH opportunity in a first time period for using the first beam based on the beam use time period information 307. Thus, the UE 115 may be configured to transmit the PRACH transmission transmitted during the first time period using the first beam. The UE 115 may transmit a second PRACH transmission 382 using the second beam at a second PRACH opportunity in a second time period for using the second beam based on the beam use time period information 307. Thus, the UE 115 may be configured to transmit the PRACH transmission transmitted during the second time period using a second beam different from the first beam. The configuration of the UE to transmit the PRACH transmission in the first time period and the second time period using the first beam and the second beam may be performed, for example, based on the beam use time period information received by the UE 115 from the base station 105 in the beam use time period transmission 370. For example, the UE 115 may determine that a first PRACH transmission opportunity for transmitting the first PRACH transmission 380 occurs during a first time period for using the first beam, and may transmit the first PRACH transmission 380 using the first beam. Similarly, the UE 115 may determine that a second PRACH transmission opportunity for transmitting the second PRACH transmission 382 occurs during a second time period for using the second beam, and may transmit the second PRACH transmission 382 using the second beam. The second PRACH transmission 382 may be a repetition of the first PRACH transmission 380. In some embodiments, the UE 115 may determine that the second PRACH transmission 382 is to be transmitted at a second PRACH transmission opportunity (the second PRACH transmission opportunity is during the first time period for using the first beam), and may transmit the second PRACH transmission 382 at the second PRACH transmission opportunity using the first beam. The UE may further transmit a first Msg3 transmission 384 and a second Msg3 transmission 386. The first Msg3 transmission 384 may be sent using the first beam, and the second Msg3 transmission 386 may be sent using the second beam. The second Msg3 transmission 386 may, for example, be a repetition of the first Msg3 transmission 384. The UE 115 may determine to send the first Msg3 transmission 384 using the first beam and to send the second Msg3 transmission 386 using the second beam based on the Msg3 information received in the Msg3 information transmission 372, sending the first PRACH transmission 380 using the first beam, and sending the second PRACH transmission 382 using the second beam.

[0072] As discussed herein, a UE may be configured to use multiple different beams to send multiple PRACH transmissions, such as a first PRACH transmission and one or more repetitions of the first PRACH transmission. The UE may determine which beam to use for each PRACH transmission based on a time period in which a PRACH transmission opportunity occurs during which the PRACH transmission is to be sent. In some embodiments, such time periods may be determined based on a coherence time, and each time period may have a duration equal to the duration of the coherence time. In addition, based on the beam used to send the PRACH transmission, the same beam may be used to send a subsequent Msg3 transmission associated with the PRACH transmission. Figure 4 An example time / frequency diagram 400 of multiple PRACH transmissions 402A-402D and Msg3 transmissions 406A-406H is shown in FIG.

[0073] The UE may use the first beam to transmit the first PRACH transmission 402A and the second PRACH transmission 402B. The UE may determine to use the first beam to transmit the first PRACH transmission 402A and the second PRACH transmission 402B within the first time period 404A based on the PRACH transmission timing at which the first PRACH transmission 402A and the second PRACH transmission 402B are transmitted. The UE may further use the second beam to transmit the third PRACH transmission 402C and the fourth PRACH transmission 402D. The UE may determine to use the second beam to transmit the third PRACH transmission 402C and the fourth PRACH transmission 402D within the second time period 404B based on the PRACH transmission timing at which the third PRACH transmission 402C and the fourth PRACH transmission 402D are transmitted. The second PRACH transmission 402B, the third PRACH transmission 402C, and the fourth PRACH transmission 402D may be a repetition of the first PRACH transmission 402A, thereby including the same or similar information. The first time period 404A may, for example, be a first time period 404A for PRACH transmission using the first beam, such as a first time period in which the UE is configured to use the first beam to transmit PRACH transmissions, and the second time period 404B may be a second time period 404B for PRACH transmission using the second beam, such as a second time period in which the UE is configured to use the second beam to transmit PRACH transmissions. The UE may determine the first time period 404A and the second time period 404B based on the coherence time. For example, the coherence time may specify a duration for the UE to use the same beam for PRACH transmissions. The duration of the first time period 404A and the second time period 404B may be equal to the duration of the coherence time. The second time period 404B may start at the end of the first time period 404A. The first time period 404A may start at the beginning of a PRACH opportunity for transmitting a first PRACH transmission 402A (to be followed by one or more repetitions of the first PRACH transmission 402A). In some embodiments, one, two, or more PRACH transmission opportunities for PRACH transmissions may occur in a single time period for using the first beam. In some embodiments, less than or more than three repetitions of the same PRACH transmission may be sent. In some embodiments, more than two beams may be used for PRACH transmissions. For example, an additional time period may include one or more PRACH transmission opportunities for sending PRACH transmissions using additional beams. PRACH transmissions that are sent using the same beam and include the same or similar information, such as PRACH transmissions 402A and 402B or PRACH transmissions 402C and 402D, may be referred to as PRACH transmission bundling.Therefore, a PRACH transmission set including a first PRACH transmission and one or more repetitions of the first PRACH transmission may be transmitted using multiple beams based on the time period during which the PRACH transmission is transmitted.

[0074] The same beam used to send the PRACH transmission may be used to send a set of Msg3 transmissions 406A-406H, including a first Msg3 transmission 406A and multiple repetitions 406B-406H of the first Msg3 repetition. The Msg3 transmissions 406A-406H may, for example, be Msg3 transmissions associated with PRACH transmissions 402A-402D, such as Msg3 transmissions sent by the UE in response to (in response to one or more of the PRACH transmissions 402A-402D) receiving an Msg2 transmission from a base station. For example, the Msg3 transmissions 406A-406D may be sent using a first beam, and the Msg3 transmissions 406E-406H may be sent using a second beam. The Msg3 transmissions 406B-406H may be repetitions of the Msg3 transmission 406A and may include the same or similar information. The UE may determine which Msg3 transmissions in the set of Msg3 transmissions 406A-406H to use a specific beam to transmit based on the total number of Msg3 transmissions to be transmitted associated with one or more PRACH transmissions (such as a first PRACH transmission and one or more repetitions of the first PRACH transmission, including a first Msg3 transmission 406A and one or more repetitions 406B-406H of the first Msg3 transmission 406A) and based on the beam used to transmit the PRACH transmissions 402A-402D associated with the Msg3 transmissions 406A-406H. For example, if two beams are used for transmissions in the set of PRACH transmissions (including a first PRACH transmission and one or more repetitions of the first PRACH transmission), and the UE is scheduled to transmit eight Msg3 transmissions associated with these PRACH transmissions, the UE may transmit the first set 406A-406D of Msg3 transmissions using the first beam and transmit the second set 406E-406H of Msg3 transmissions using the second beam. Thus, the number of Msg3 transmissions transmitted using a particular beam may be equal to the total number of Msg3 transmissions associated with PRACH transmissions divided by the number of beams used to transmit the PRACH transmissions and one or more repetitions of the PRACH transmissions.

[0075] In some embodiments, the UE may be configured to send the number of Msg3 transmissions 406A-406H associated with the PRACH transmissions 402A-402D divided by the number of beams that may be used to send the associated PRACH transmissions so that the same number of Msg3 transmissions are sent using each respective beam. As another example, if the total number of Msg3 transmissions is six and three beams are used to send the associated PRACH transmissions, the UE may send two Msg3 transmissions using each of these beams. Although shown as being sent on the same frequency resources, in some embodiments, the PRACH transmissions 402A-402D and the Msg3 transmissions 406A-406H may be sent on different frequency resources. Thus, the UE may use multiple different beams to send PRACH transmissions and use the same beam to send associated Msg3 transmissions.

[0076] Figure 5 5 is a flow chart illustrating an example process 500 for supporting PRACH repetition using different beams according to one or more aspects. The operations of process 500 may be performed by a UE (such as the one described above with reference to Figure 1 , Figure 2 or Figure 3 UE 115 described or referenced Fig. 9 For example, the example operations (also referred to as "blocks") of process 500 may enable UE 115 to support PRACH repetition using different beams.

[0077] The UE may determine a beam for sending multiple PRACH transmissions, such as a first PRACH transmission and one or more repetitions of the first PRACH transmission, based on a time period during which a PRACH transmission opportunity occurs during which the PRACH transmission is sent. Such a time period may be determined, for example, based on a coherence time. At box 502, the UE may determine that a first PRACH transmission opportunity occurs during a first time period for sending a PRACH transmission using a first beam. The first time period may be a first time period during which the UE is configured to send a PRACH transmission using a first beam. For example, the UE may determine to send a first PRACH transmission and one or more repetitions of the first PRACH transmission. The UE may determine that the first PRACH transmission is to be sent at a first PRACH opportunity that occurs during the first time period. The first time period may be determined based on the coherence time, such as regarding Figure 6 The first PRACH transmission opportunity may be a transmission opportunity for an initial PRACH transmission that will be followed by one or more repetitions of the first PRACH transmission. Thus, in some embodiments, the first time period may begin at the beginning of the first PRACH transmission opportunity.

[0078] At block 504, the UE may determine that a second PRACH transmission opportunity occurs during a second time period for using a second beam. The second beam may be different from the first beam. The second time period may be a time period in which the UE is configured to use the second beam to send a PRACH transmission. The second PRACH transmission opportunity may be a PRACH transmission opportunity for sending a repetition of the first PRACH transmission including the same or similar information. For example, the UE may determine that a second PRACH transmission opportunity occurring in the second time period sends a second PRACH transmission that is a repetition of a first PRACH transmission that is to be sent at the first PRACH transmission opportunity. The second time period may be after the first time period. In some embodiments, the second time period may be equal to the first time period in duration. In some embodiments, the second time period may start at the end of the first time period. In some embodiments, the UE may determine that an additional PRACH transmission opportunity for sending an additional repetition of the first PRACH transmission occurs in an additional time period for using an additional different beam (such as an additional time period in which the UE is configured to use an additional different beam to send a PRACH transmission). In some embodiments, the time periods for using beams for PRACH transmissions do not overlap.

[0079] At box 506, the UE may determine that a third PRACH transmission opportunity occurs during the first time period for using the first beam. The third PRACH transmission opportunity may be a repeated PRACH transmission opportunity for sending the first PRACH transmission including the same or similar information. For example, the UE may determine that a third PRACH transmission opportunity occurring in the first time period transmits a third PRACH transmission that is a repetition of a first PRACH transmission that is to be sent at the first PRACH transmission opportunity in the first time period. Therefore, because the third PRACH transmission occurs in the first time period for using the first beam, the first beam may also be used to send the third PRACH transmission. In some embodiments, the UE may determine that an additional PRACH transmission opportunity for an additional repetition of the first PRACH transmission occurs during the first time period, the second time period, or the additional time period. Therefore, the UE may determine that a PRACH transmission and one or more repetitions of the PRACH transmission occur in a specific time period for using a specific beam. The third PRACH transmission opportunity and the first PRACH transmission opportunity and any other PRACH transmission opportunities for repetition of the first PRACH transmission occurring during the first time period may form a first RACH opportunity bundle.

[0080] At block 508, the UE may send a first PRACH transmission at a first PRACH opportunity using the first beam. For example, because the first PRACH transmission is sent at a first PRACH opportunity that occurs during a first time period for using the first beam (such as a first time period in which the UE is configured to send PRACH transmissions using the first beam), the UE may send the first PRACH transmission using the first beam. The first PRACH transmission may be, for example, a random access preamble, such as a Msg1 transmission.

[0081] At block 510, the UE may send a second PRACH transmission at a second PRACH opportunity using the second beam. For example, because the second PRACH transmission is sent at a second PRACH opportunity that occurs during a second time period for using the second beam (such as a second time period in which the UE is configured to send PRACH transmissions using the second beam), the UE may send the second PRACH transmission using the second beam. The second PRACH transmission may, for example, be a repetition of the first PRACH transmission including the same or similar information.

[0082] At block 512, the UE may transmit a third PRACH transmission at a third PRACH opportunity using the first beam. For example, because the third PRACH transmission is transmitted at a third PRACH opportunity that occurs during a first time period for using the first beam, the UE may transmit the third PRACH transmission using the first beam. Thus, the third PRACH transmission may be transmitted using the same beam as the first transmission because the PRACH transmission occasions at which the first PRACH transmission and the third PRACH transmission are transmitted occur during the first time period. The third PRACH transmission may, for example, be a repetition of the first PRACH transmission including the same or similar content.

[0083] The UE may use the same beam used to send the PRACH transmission to send a Msg3 transmission associated with the PRACH transmission, such as a first Msg3 repetition and one or more repetitions of the first Msg3 transmission. At block 514, the UE may determine the number of Msg3 transmissions associated with the PRACH transmission (such as associated with the first PRACH transmission, the second PRACH transmission, or the third PRACH transmission). For example, as described with respect to blocks 508-512, the UE may send a PRACH transmission and one or more repetitions of the PRACH transmission. One or more of the PRACH transmission and the repetition may be received by the base station. The base station may send a response, such as an Msg3 information transmission. The Msg3 information transmission may, for example, be a transmission including information for scheduling a set of Msg3 transmissions, such as an Msg2 transmission. For example, the Msg3 information transmission may include the total number of Msg3 transmissions associated with the PRACH transmission to be sent by the UE, such as the total number of the first Msg3 transmission and one or more repetitions of the first Msg3 transmission. For example, determining the number of Msg3 transmissions associated with a PRACH transmission may include receiving the number in a Msg2 transmission from the base station or receiving the number in a downlink control information (DCI) transmission from the base station (such as a DCI transmission for scheduling the Msg3 transmission). The Msg3 transmission associated with the PRACH transmission may, for example, be an Msg3 transmission and one or more repetitions of the Msg3 transmission scheduled by the base station in response to receiving a PRACH transmission and one or more repetitions of the PRACH transmission by the base station. Therefore, the Msg3 transmission may be associated with the first PRACH transmission, the second PRACH transmission, or the third PRACH transmission because these Msg3 transmissions may be scheduled by the base station in response to receiving the first PRACH transmission, the second PRACH transmission, or the third PRACH transmission or other PRACH transmissions that are repetitions of the first PRACH transmission.

[0084] At block 516, the UE may transmit a first set of Msg3 transmissions using a first beam and a second set of Msg3 transmissions using a second beam based on the number of Msg3 transmissions. For example, the UE may transmit a first set of Msg3 transmissions using a first beam based on the number of Msg3 transmissions and based on the transmission of a first PRACH transmission using the first beam. The UE may transmit a second set of Msg3 transmissions using a second beam based on the number of Msg3 transmissions and based on the transmission of a second PRACH transmission using the second beam. In some embodiments, the first set of Msg3 transmissions may include one or more Msg3 transmissions, and the second set of Msg3 transmissions may include one or more Msg3 transmissions. For example, the first set of Msg3 transmissions may include a first Msg3 transmission and one or more repetitions of the first Msg3 transmission, and the second set of Msg3 transmissions may include one or more repetitions of the first Msg3 transmission. The Msg3 transmission may, for example, be a scheduled uplink transmission transmitted by the UE. The transmission of the first set of Msg3 transmissions using the first beam based on the number of Msg3 transmissions and the transmission of the first PRACH transmission using the first beam and the transmission of the second set of Msg3 transmissions using the second beam based on the number of Msg3 transmissions and the transmission of the second PRACH transmission using the second beam may be based on the total number of beams used to transmit the first PRACH transmission and the repetition of the first PRACH transmission. For example, the UE may determine the total number of beams used to transmit the first PRACH transmission and the repetition of the first PRACH transmission, and may divide the number of Msg3 transmissions by the number of beams. The UE may then use each of these beams to transmit a number of consecutive Msg3 transmissions equal to the quotient of the number of beams used for PRACH transmissions and the number of Msg3 transmissions. In some embodiments, the UE may be configured to transmit the number of Msg3 transmissions that may be divided by the number of beams used for PRACH transmissions. Thus, for example, if the UE transmits a PRACH transmission and a repetition of the PRACH transmission using three beams and the total number of Msg3 transmissions to be transmitted by the UE is nine, the UE may transmit a first set of three Msg3 transmissions using a first beam, transmit a second set of three Msg3 transmissions using a second beam, and transmit a third set of three Msg3 transmissions using a third beam. Other combinations of the number of Msg3 transmissions and the number of PRACH transmissions may also be used. Thus, the UE may transmit the Msg3 transmission using a particular beam based on the beam used to transmit the associated PRACH transmission and the total number of Msg3 transmissions to be transmitted.

[0085] Figure 6600 is a flow chart illustrating an example process 600 for supporting PRACH repetition using different beams according to one or more aspects. The operations of process 600 may be performed by a UE (such as the one described above with reference to Figure 1 , Figure 2 , Figure 3 UE 115 described or referenced Fig. 9 For example, the example operations (also referred to as "blocks") of process 600 may enable UE 115 to support PRACH repetition using different beams.

[0086] At block 602, the UE may determine a coherence time. The coherence time may, for example, be the duration of a time period during which a PRACH transmission and repetitions of the PRACH transmission should be transmitted using the same beam. In some embodiments, the UE may determine the coherence time by receiving an indication of the coherence time from a base station, such as by receiving an indication of the coherence time from a base station in a system information block one (SIB1) transmission or other system information (OSI) transmission from the base station. In some embodiments, such as when the UE is configured in a radio resource control (RRC) connected mode, the UE may receive an indication of the coherence time in an RRC transmission from the base station, such as for a contention-free random access PRACH procedure. In some embodiments, the UE may determine the coherence time based on a frequency range of the UE, a frequency band of the UE, a PRACH format of the UE, such as a PRACH format used to transmit a first PRACH transmission and any repetitions of the first PRACH transmission. In some embodiments, such as when the UE is configured in RRC connected mode, the UE may determine the coherence time based on the TDW of the UE for DMRS bundling for a unicast physical uplink shared channel (PUSCH). Thus, the coherence time may be a duration during which all PRACH transmissions should be sent using the same beam. In some embodiments, the UE may determine the coherence time by accessing a predefined coherence time stored in a memory of the UE. For example, the coherence time may be a coherence time set by a standard specification and may be stored in a memory of the UE.

[0087] At block 604, the UE may determine a first time period based on the coherence time. The first time period may be a first time period for one or more PRACH transmissions using the first beam, such as a first time period in which the UE is configured to transmit PRACH transmissions using the first beam. Figure 5The duration of the first time period described with respect to process 500 may be equal to the duration of the coherence time. Thus, the first time period may be determined based on the coherence time. In some embodiments, the first time period may be determined by determining the start of the first PRACH transmission opportunity described with respect to process 500 and by establishing an end of the first time period at a point in time at which the duration of the first time period will be equal to the duration of the coherence time.

[0088] At block 606, the UE may determine a second time period based on the coherence time. The second time period may be a second time period for performing one or more PRACH transmissions using the second beam, such as a time period during which the UE is configured to transmit PRACH transmissions using the second beam. Figure 5 The duration of the second time period described in process 500 may be equal to the duration of the coherence time. Therefore, the second time period may be determined based on the coherence time, and the second time period may have a duration equal to the duration of the first time period. In some embodiments, the second time period may be determined by determining the end of the first time period described with respect to process 500 and by establishing the end of the second time period at a point in time at which the duration of the second time period will be equal to the duration of the coherence time. In some embodiments, the UE may determine an additional time period for using an additional beam when sending a PRACH transmission, such as a time period having a duration equal to the coherence time and starting from the end of the second time period. In some embodiments, the time period may start at the end of the previous time period and may have a duration equal to the coherence time. Therefore, the UE may determine a time period for using a specific beam for PRACH transmission and repetition of the PRACH transmission based on the coherence time.

[0089] Figure 7 700 is a flow chart illustrating an example process 700 for supporting PRACH repetition using different beams according to one or more aspects. The operations of process 700 may be performed by a base station (such as described above with reference to Figures 1 to 3 The base station 105 described or referred to below Figure 7 For example, the example operations of process 700 may enable base station 105 to support PRACH repetition using different beams.

[0090] The base station may determine a coherence time for the UE to use when sending one or more PRACH transmissions using different beams. The base station may also determine a number of Msg3 transmissions to be sent by the UE after sending the one or more PRACH transmissions. For example, process 700 may be performed by Figure 5 The process of 500 or Figure 6The process 600 is performed by a base station that communicates with a UE of the base station. At box 702, the base station may determine a coherence time for the UE. For example, the base station may determine a coherence time for a UE that is in an RRC connected state with the base station or otherwise communicates with the base station. The coherence time may, for example, be the length of a time period during which a PRACH transmission and a repetition of the PRACH transmission should be sent by the UE using the same beam. In some embodiments, the base station may determine the coherence time based on one or more transmission parameters of the UE for which the coherence time is determined, the one or more transmission parameters such as the frequency range of the UE, the frequency band of the UE, the PRACH format of the UE, such as the PRACH format used to send a first PRACH transmission and any repetitions of the first PRACH transmission. In some embodiments, such as when the UE is configured in RRC connected mode, the base station may determine the coherence time based on the TDW used for the DMRS bundling of the UE for the unicast physical uplink shared channel (PUSCH), which may also be a transmission parameter of the UE.

[0091] At block 704, the base station may send an indication of the coherence time to the UE. For example, the base station may send the indication of the coherence time to the UE in a SIB1 transmission or other system information (OSI) transmission. As another example, when the UE is in an RRC connected mode with the base station, the base station may send the indication of the coherence time to the UE in an RRC transmission, such as for a contention-free random access PRACH procedure.

[0092] At block 706, the base station may receive a first PRACH transmission from the UE using the first beam at a first PRACH transmission opportunity after sending the indication of the coherence time. In some embodiments, the base station may receive a first PRACH transmission from the UE using the first beam at a first PRACH transmission opportunity based on the indication of the coherence time. For example, the UE may determine a plurality of time periods for PRACH transmissions using different beams, as described with respect to process 600, and may transmit the PRACH transmission using a particular beam based on the determined time periods, as described with respect to process 500. The first PRACH transmission may, for example, be the first PRACH transmission described with respect to block 508 of process 500. Thus, for example, the first PRACH transmission received from the UE may be transmitted by the UE using the first beam at the first PRACH transmission opportunity based on a determination by the UE that the first PRACH transmission opportunity occurs during the first time period, and the first time period may be determined by the UE based on the coherence time.

[0093] At block 708, the base station may receive a second PRACH transmission from the UE using the second beam at the second PRACH transmission opportunity after sending the indication of the coherence time. In some embodiments, the base station may receive the second PRACH transmission from the UE using the second beam at the second PRACH transmission opportunity based on the coherence time. The second PRACH transmission received from the UE may be transmitted by the UE using the second beam at the second PRACH transmission opportunity based on a determination by the UE that the second PRACH transmission opportunity occurs during a second time period, and the second time period may be determined by the UE based on the coherence time.

[0094] At block 710, the base station may receive a third PRACH transmission from the UE using a third beam at a third PRACH transmission opportunity after sending an indication of the coherence time. In some embodiments, the base station may receive a third PRACH transmission from the UE using the first beam at a third PRACH transmission opportunity based on the coherence time. The third PRACH transmission received from the UE may be transmitted by the UE using the first beam at the third PRACH transmission opportunity based on a determination by the UE that the third PRACH transmission opportunity occurs during the first time period. In some embodiments, the base station may receive only a single PRACH transmission from the UE, such as one of the first PRACH transmission, the second PRACH transmission, or the third PRACH transmission. The second PRACH transmission and the third PRACH transmission may, for example, be a repetition of the first PRACH transmission. In some embodiments, the base station may receive additional PRACH transmissions using the same or different beams.

[0095] At block 712, the base station may send to the UE a number of Msg3 transmissions associated with one or more PRACH transmissions (such as a first PRACH transmission) of the received PRACH transmissions to be sent by the UE. For example, the base station may determine the number of Msg3 transmissions to be sent by the UE and may send the number to the UE. The base station may also allocate one or more resources for sending the PRACH transmissions to the UE and may send the allocation of the PRACH transmissions to the UE. The number of Msg3 transmissions may be sent in a Msg2 transmission sent by the base station in response to receiving one or more PRACH transmissions of the PRACH transmissions from the UE. The number of Msg3 transmissions may be sent in a DCI transmission. The Msg3 transmission may be associated with the PRACH transmission because the number of Msg3 transmissions or the resource allocation for the Msg3 transmission may be sent in response to receiving one or more PRACH transmissions of the PRACH transmissions from the UE.

[0096] At block 714, the base station may receive a first set of Msg3 transmissions transmitted by the UE using the first beam and a second set of Msg3 transmissions transmitted by the UE using the second beam based on the number of transmitted Msg3 transmissions. For example, the first set of multiple Msg3 transmissions may be transmitted by the UE using the first beam based on the number of multiple Msg3 transmissions and the transmission of the first PRACH transmission using the first beam, as described with reference to process 500. The base station may also receive a second set of Msg3 transmissions transmitted by the UE using the first beam based on the number of transmitted Msg3 transmissions. For example, the second set of multiple Msg3 transmissions may be transmitted by the UE using the second beam based on the number of multiple Msg3 transmissions and the transmission of the second PRACH transmission using the second beam, as described with reference to process 500. The base station may also receive additional sets of Msg3 transmissions using the same or different beams. In some embodiments, the first set of Msg3 transmissions may include one or more Msg3 transmissions, and the second set of Msg3 transmissions may include one or more Msg3 transmissions. The first set of Msg3 transmissions may include a first Msg3 transmission and one or more repetitions of the first Msg3 transmission, and the second set of Msg3 transmissions may include one or more repetitions of the first Msg3 transmission. A set of Msg3 transmissions transmitted using the same beam may be referred to as an Msg3 transmission bundle or an Msg3 repetition bundle. Thus, the base station may provide the UE with a coherence time and the number of Msg3 transmissions, and may receive a PRACH transmission and an Msg3 transmission respectively in response to an indication of the coherence time and the number of Msg3 transmissions.

[0097] Figure 8 8 is a block diagram of an example base station 800 supporting PRACH repetition using different beams according to one or more aspects. The base station 800 may be configured to perform operations including reference Figure 7 In some implementations, the base station 800 includes a block of the process 700 described above. Figures 1 to 3 105 of the present invention. For example, the base station 800 may include a controller 240 that operates to execute logic or computer instructions stored in a memory 242 and controls the components of the base station 800 that provide the features and functions of the base station 800. The base station 800 transmits and receives signals via wireless radio components 801a-801t and antennas 234a-234t under the control of the controller 240. The wireless radio components 801a-801t include various components and hardware, such as those described in Figure 2 , illustrated for base station 105, includes modulators and demodulators 232a-232t, a transmit processor 220, a TX MIMO processor 230, a MIMO detector 236, and a receive processor 238.

[0098] As shown, the memory 242 may include beam information 802, beam use time period information 803, Msg3 transmission information 804, and beam use time period determination logic 805. The beam information 802 may include information about one or more beams on which the UE 115 will send a PRACH transmission (such as a random access preamble or Msg1 transmission) to the base station 105, or about one or more beams on which the UE will send one or more Msg3 transmissions to the base station 800. The beam use time period information 803 may include information about one or more time periods for the UE 115 to send PRACH transmissions using different beams. For example, the beam use time period information 803 may include one or more coherence times. The beam use time period information 803 may also include information for use by the beam use time period determination logic 805 in determining the beam use time period or coherence time, such as the frequency range of the UE, the frequency band of the UE, the PRACH format used by the UE to send the PRACH transmission, or the TDW of the UE for DMRS bundling. The Msg3 transmission information 804 may, for example, include information about the number of Msg3 transmissions (such as Msg3 transmissions and one or more repetitions of the Msg3 transmissions) to be transmitted by the UE in response to the Msg2 transmission performed by the base station 800. The beam use time period determination logic 805 may include logic configured to determine a time period for the UE to use a particular beam to transmit a PRACH transmission. For example, the beam use time period determination logic 805 may be configured to determine a first time period for using a first beam for PRACH transmissions (such as a first time period in which the UE is configured to use the first beam to transmit PRACH transmissions), a second time period for using a second beam for PRACH transmissions (such as a second time period in which the UE is configured to use the second beam to transmit PRACH transmissions), and (in some embodiments) an additional time period for using an additional beam for PRACH transmissions. In some embodiments, the beam use time period determination logic 805 may include logic configured to determine one or more coherence times for the UE. In some embodiments, the beam use period determination logic 805 may include logic configured to determine the coherence time for the UE based on the frequency range of the UE, the frequency band of the UE, the PRACH format used by the UE to send PRACH transmissions, or the TDW of the UE for DMRS bundling. The base station 800 may receive information from one or more UEs (such as Figures 1 to 3 UE115 or Fig. 9 UE 900) receives signals or sends signals to one or more UEs.

[0099] Fig. 9 is a block diagram of an example UE 900 that supports PRACH repetition using different beams according to one or more aspects. The UE 900 may be configured to perform operations, including reference Figure 5 to Figure 6 In some implementations, the UE 900 includes a reference Figures 1 to 3 1 and 115. For example, the UE 900 includes a controller 280 that operates to execute logic or computer instructions stored in a memory 282 and controls the components of the UE 900 that provide the features and functions of the UE 900. Under the control of the controller 280, the UE 900 sends and receives signals via wireless radio components 901a-901r and antennas 252a-252r. The wireless radio components 901a-901r include various components and hardware, such as Figure 2 As illustrated for UE 115 in FIG. 1 , these components and hardware include modulators and demodulators 254a - 254r , a MIMO detector 256 , a receive processor 258 , a transmit processor 264 , and a TX MIMO processor 266 .

[0100] As shown, the memory 282 may include PRACH timing information 902, beam information 903, beam usage time period information 904, Msg3 transmission information 905, and beam usage determination logic 906. The PRACH timing information 902 may, for example, include one or more times of one or more PRACH transmission opportunities. For example, the PRACH timing information 902 may include one or more times of one or more PRACH transmission opportunities for transmitting a PRACH transmission (such as a random access preamble or Msg1 transmission) and one or more repetitions of the PRACH transmission. The beam information 903 may, for example, include information about one or more beams to be used when transmitting a PRACH transmission, one or more repetitions of a PRACH transmission, an Msg3 transmission, and one or more repetitions of the Msg3 transmission. The beam information 903 may, for example, include information about the direction of one or more beams, such as TCI status information for one or more beams, QCL status information for one or more beams, uplink spatial filtering configuration for one or more beams, or other information for one or more beams. The beam use time period information 904 may, for example, include one or more time periods for transmitting PRACH transmissions using one or more beams. For example, the beam use time period information 904 may include a first time period for transmitting PRACH transmissions using a first beam and a second time period for transmitting PRACH transmissions using a second beam. The beam use time period information 904 may, for example, include information about specific PRACH transmission opportunities that occur during a specific time period for PRACH transmissions using a specific beam. The beam use time period information 904 may also include one or more coherence times for the UE 900, such as one or more coherence times determined by the UE 900 or by a base station such as the base station 800. The Msg3 transmission information 905 may include the number of Msg3 transmissions to be transmitted by the UE 900 (such as the number of the first Msg3 transmission and one or more repetitions of the Msg3 transmission) and timing information for the Msg3 transmission. The Msg3 transmission information 905 may include scheduling information for the Msg3 transmission received from the base station 800 in the Msg2 transmission. The beam usage determination logic 906 may be configured to determine time periods for using different beams to transmit PRACH transmissions, such as a PRACH transmission and one or more repetitions of the PRACH transmission. Such determination may include determining time periods for using different beams based on coherence times. The beam usage determination logic 906 may further determine which PRACH transmission opportunities for transmitting PRACH transmissions and repetitions of the PRACH transmissions occur during a particular time period, and therefore which beams should be used to transmit the PRACH transmissions at particular PRACH transmission opportunities.The beam usage determination logic 906 may determine one or more beams for use when sending one or more Msg3 transmissions (such as an Msg3 transmission and one or more repetitions of the Msg3 transmission). Such a determination may include determining one or more beams for use when sending one or more Msg3 transmissions based on a total number of Msg3 repetitions to be sent in response to one or more PRACH transmissions. The beam usage determination logic 906 may also determine a coherence time as described herein. The UE 900 may receive information from one or more network entities (such as. Figures 1 to 3 Base station 800 or Figure 8 The base station illustrated in FIG. 1 receives a signal or sends a signal to one or more network entities.

[0101] In one or more aspects, techniques for supporting PRACH repetition using different beams may include additional aspects, such as any single aspect or any combination of aspects described below or in combination with one or more other processes or devices described elsewhere herein. In a first aspect, supporting PRACH repetition using different beams may include an apparatus configured to: determine that a first PRACH transmission opportunity occurs during a first time period, wherein the first time period is a first time period in which the apparatus is configured to use a first beam to transmit a PRACH transmission; determine that a second PRACH transmission opportunity occurs during a second time period, wherein the second time period is a second time period in which the apparatus is configured to use a second beam different from the first beam to transmit a PRACH transmission; based on determining that the first PRACH transmission opportunity occurs during the first time period, transmit the first PRACH transmission at the first PRACH transmission opportunity using the first beam; and based on determining that the second PRACH transmission opportunity occurs during the second time period, transmit the second PRACH transmission at the second PRACH transmission opportunity using the second beam, wherein the second PRACH transmission is a repetition of the first PRACH transmission. Additionally, the apparatus may perform or operate according to one or more aspects as described below. In some specific implementations, the device includes a wireless device, such as a UE. In some specific implementations, the device may include at least one processor, and a memory coupled to the processor. The processor may be configured to perform the operations described herein with respect to the device. In some other specific implementations, the device may include a non-transitory computer-readable medium having a program code recorded thereon, and the program code may be executable by a computer to enable the computer to perform the operations described herein with reference to the device. In some specific implementations, the device may include one or more components configured to perform the operations described herein. In some specific implementations, the method of wireless communication may include one or more operations described herein with reference to the device.

[0102] In a second aspect, alone or in combination with one or more of the above aspects, the apparatus is further configured to: determine that a third PRACH transmission opportunity occurs during a first time period; and based on determining that the third PRACH transmission opportunity occurs during the first time period, use the first beam to transmit a third PRACH transmission at the third PRACH transmission opportunity, wherein the third PRACH transmission is a repetition of the first PRACH transmission.

[0103] In a third aspect, either alone or in combination with one or more of the above aspects, the apparatus is further configured to: determine a coherence time for the UE, determine a first time period based on the coherence time; and determine a second time period based on the coherence time, wherein the first duration of the coherence time is equal to the second duration of the first time period and the third duration of the second time period.

[0104] In a fourth aspect, alone or in combination with one or more of the above aspects, the apparatus is further configured to determine the coherence time by at least one of: reading the coherence time from a memory of the UE; or receiving an indication of the coherence time from the first network node.

[0105] In a fifth aspect, either alone or in combination with one or more of the above aspects, the apparatus is further configured to receive an indication of the coherence time from the first network node by at least one of: receiving an indication of the coherence time in a system information block one (SIB1) transmission from the first network node; or receiving an indication of the coherence time in a radio resource control (RRC) transmission from the first network node.

[0106] In a sixth aspect, either alone or in combination with one or more of the above aspects, the apparatus is further configured to determine the coherence time based on at least one of: a frequency range of the UE; a frequency band of the UE; a PRACH format of the UE; or a time domain window (TDW) of the UE for demodulation reference signal (DMRS) bundling.

[0107] In a seventh aspect, alone or in combination with one or more of the above aspects, the apparatus is further configured to: determine the number of multiple message three (Msg3) transmissions associated with the first PRACH transmission and the second PRACH transmission; based on the number of multiple Msg3 transmissions and the transmission of the first PRACH transmission using the first beam, use the first beam to transmit a first set of multiple Msg3 transmissions; and based on the number of multiple Msg3 transmissions and the transmission of the second PRACH transmission using the second beam, use the second beam to transmit a second set of multiple Msg3 transmissions, wherein the second set includes one or more repetitions of the first Msg3 transmission in the first set.

[0108] In an eighth aspect, either alone or in combination with one or more of the above aspects, the apparatus is further configured to determine a quantity by at least one of: receiving a quantity in a message two (Msg2) sent from the first network node; or receiving a quantity in a downlink control information (DCI) sent from the first network node.

[0109] In one or more aspects, techniques for supporting PRACH repetition using different beams may include additional aspects, such as any single aspect or any combination of aspects described below or in combination with one or more other processes or devices described elsewhere herein. In a ninth aspect, supporting PRACH repetition using different beams may include a device configured to: determine a coherence time for a UE based on one or more transmission parameters of the UE; send an indication of the coherence time to the UE; and after sending the indication of the coherence time, receive a first PRACH transmission from the UE using a first beam at a first physical random access channel (PRACH) transmission opportunity. Additionally, the device may be performed or operated according to one or more aspects as described below. In some specific implementations, the device includes a wireless device, such as a first network node or a base station. In some specific implementations, the device may include at least one processor, and a memory coupled to the processor. The processor may be configured to perform the operations described herein with respect to the device. In some other implementations, the apparatus may include a non-transitory computer-readable medium having program code recorded thereon, and the program code may be executable by a computer to cause the computer to perform the operations described herein with reference to the apparatus. In some implementations, the apparatus may include one or more components configured to perform the operations described herein. In some implementations, the method of wireless communication may include one or more operations described herein with reference to the apparatus.

[0110] In a tenth aspect, either alone or in combination with one or more of the above aspects, a first PRACH transmission is transmitted by the UE using a first beam at the first PRACH transmission opportunity based on a determination by the UE that the first PRACH transmission opportunity occurs during a first time period, and wherein the first time period is determined by the UE based on a coherence time.

[0111] In an eleventh aspect, alone or in combination with one or more of the above aspects, the apparatus is configured to receive a second physical random access channel (PRACH) transmission from a UE using a first beam at a second PRACH transmission opportunity, wherein the second PRACH transmission is transmitted by the UE using the first beam at the second PRACH transmission opportunity based on a determination by the UE that the second PRACH transmission opportunity occurs during a first time period, and wherein the second PRACH transmission is a repetition of the first PRACH transmission.

[0112] In a twelfth aspect, either alone or in combination with one or more of the above aspects, one or more transmission parameters of the UE include at least one of the following items: a frequency range of the UE; a frequency band of the UE; a PRACH format of the UE; or a time domain window (TDW) of the UE for demodulation reference signal (DMRS) bundling.

[0113] In a thirteenth aspect, either alone or in combination with one or more of the above aspects, the apparatus is configured to send an indication of coherence time to the UE by at least one of: sending an indication of coherence time in a system information block one (SIB1) transmission; or sending an indication of coherence time in a radio resource control (RRC) transmission.

[0114] In a fourteenth aspect, alone or in combination with one or more of the above aspects, the apparatus is configured to send to a UE the number of multiple message three (Msg3) transmissions associated with a first PRACH transmission to be sent by the UE; and receive a first set of multiple Msg3 transmissions sent by the UE using a first beam, wherein the first set of multiple Msg3 transmissions is sent by the UE based on the number of multiple Msg3 transmissions and the first PRACH transmission using the first beam.

[0115] In a fifteenth aspect, either alone or in combination with one or more of the above aspects, the apparatus is configured to send the number of multiple Msg3 transmissions by: sending the number in a message two (Mg2) transmission; or sending the number in a downlink control information (DCI) transmission.

[0116] As described herein, a node (which may be referred to as a node, a network node, a network entity, or a wireless node) may include, may be, or may be included in (e.g., as a component of) a base station (e.g., any base station described herein), a UE (e.g., any UE described herein), a network controller, a device, an apparatus, a computing system, an integrated access and backhaul (IAB) node, a distributed unit (DU), a central unit (CU), a remote / radio unit (RU) (which may also be referred to as a remote radio unit (RRU)), and / or another processing entity configured to perform any of the techniques described herein. For example, a network node may be a UE. For another example, a network node may be a base station or a network entity. Similarly, references to UE, base station, apparatus, device, computing system, etc. may include disclosure of UE, base station, apparatus, device, computing system, etc. as a network node. For example, a disclosure that a UE is configured to receive information from a base station also discloses that a first network node is configured to receive information from a second network node. Consistent with the present disclosure, once a specific example is expanded according to the present disclosure (e.g., a UE is configured to receive information from a base station and it is also disclosed that a first network node is configured to receive information from a second network node), a broader example of a narrower example can be interpreted inversely, but in a broad, open-ended manner. In the above example where a UE is configured to receive information from a base station and it is also disclosed that a first network node is configured to receive information from a second network node, the first network node may refer to a first UE configured to receive information, a first base station, a first device, a first equipment, a first computing system, a first group of one or more components, a first processing entity, etc.; and the second network node may refer to a second UE, a second base station, a second device, a second equipment, a second computing system, a second group of one or more components, a second processing entity, etc.

[0117] It should be understood by those skilled in the art that any of a variety of different technologies and techniques may be used to represent information and signals. For example, data, instructions, commands, information, signals, bits, symbols, and chips that may be mentioned throughout the above description may be represented by voltage, current, electromagnetic waves, magnetic fields or magnetic particles, light fields or optical particles, or any combination thereof.

[0118] In this article Figures 1 to 3 as well as Figures 8 to 9The components, functional blocks and modules described include processors, electronic devices, hardware devices, electronic components, logical circuits, memories, software codes, firmware codes, etc., or any combination thereof. Software should be broadly interpreted to mean instructions, instruction sets, codes, code segments, program codes, programs, subroutines, software modules, applications, software applications, software packages, routines, subroutines, objects, executables, threads of execution, processes and / or functions, etc., whether referred to as software, firmware, middleware, microcode, hardware description language or other terms. In addition, the features discussed herein may be implemented via dedicated processor circuits, via executable instructions, or a combination thereof.

[0119] The technician will further understand that the various illustrative logic boxes, modules, circuits and algorithm steps described in conjunction with the disclosure of this article can be implemented as electronic hardware, computer software or a combination of the two. In order to clearly illustrate this interchangeability of hardware and software, various illustrative components, boxes, modules, circuits and steps have been roughly described in terms of their functions. Whether such functions are implemented as hardware or software depends on the specific application and the design constraints proposed to the entire system. Those skilled in the art can implement the described functions in different ways for each specific application, but such specific implementation decisions should not be interpreted as causing departure from the scope of the present disclosure. The technician will also easily recognize that the order or combination of the components, methods or interactions described herein are only examples, and the components, methods or interactions of the various aspects of the present disclosure can be combined or performed in a manner other than the manner illustrated and described herein.

[0120] The various illustrative logics, logic blocks, modules, circuits, and algorithmic processes described in conjunction with the specific implementations disclosed herein may be implemented as electronic hardware, computer software, or a combination of both. The interchangeability of hardware and software has been generally described in terms of functionality and exemplified in the various illustrative components, blocks, modules, circuits, and processes described above. Whether such functionality is implemented in hardware or software depends on the specific application and the design constraints imposed on the overall system.

[0121] The hardware and data processing apparatus for implementing the various exemplary logics, logic blocks, modules and circuits described in conjunction with the various aspects disclosed herein may be implemented or executed using a general purpose single-chip or multi-chip processor, a digital signal processor (DSP), an application specific integrated circuit (ASIC), a field programmable gate array (FPGA) or other programmable logic device, a discrete gate or transistor logic component, a discrete hardware component or any combination thereof designed to perform the functions described herein. A general purpose processor may be a microprocessor, or any conventional processor, controller, microcontroller or state machine. In some specific implementations, a processor may be implemented as a combination of computing devices, such as a combination of a DSP and a microprocessor, a plurality of microprocessors, one or more microprocessors in combination with a DSP core, or any other such configuration. In some specific implementations, specific processes and methods may be performed by circuits specific to a given function.

[0122] In one or more aspects, the functions described may be implemented in hardware, digital electronic circuitry, computer software, firmware, including the structures disclosed in this specification and their structural equivalents, or any combination thereof. Specific implementations of the subject matter described in this specification may also be implemented as one or more computer programs, i.e., one or more modules of computer program instructions encoded on computer storage media for execution by data processing apparatus or for controlling the operation of data processing apparatus.

[0123] If implemented in software, the function may be stored as one or more instructions or codes on a computer-readable medium or sent via a computer-readable medium. The process of the method or algorithm disclosed herein may be implemented in a processor executable software module that may reside on a computer-readable medium. Computer-readable media include both computer storage media and communication media, and the communication media include any media that can be implemented to transfer a computer program from one place to another. The storage medium may be any available medium that a computer can access. As an example and not limitation, such computer-readable media may include random access memory (RAM), read-only memory (ROM), electrically erasable programmable read-only memory (EEPROM), CD-ROM or other optical disk storage devices, magnetic disk storage devices or other magnetic storage devices, or any other medium that can be used to store the required program code in the form of an instruction or data structure and can be accessed by a computer. In addition, any connection may be appropriately referred to as a computer-readable medium. Disks and optical disks as used herein include compact disks (CDs), laser disks, optical disks, digital versatile disks (DVDs), floppy disks, and blue-ray disks, wherein disks generally reproduce data magnetically, and optical disks reproduce data optically with lasers. The above combination should also be included in the scope of computer-readable media. Additionally, the operations of a method or algorithm may reside as a code and instruction set, or any combination of code and instruction sets, on a machine-readable medium or computer-readable medium, which may be incorporated into a computer program product.

[0124] Various modifications to the specific implementations described in this disclosure will be apparent to those skilled in the art, and the general principles defined herein may be applied to some other specific implementations without departing from the spirit or scope of the disclosure. Therefore, the claims are not intended to be limited to the specific implementations shown herein, but are to be consistent with the broadest scope consistent with the disclosure, the principles and novel features disclosed herein.

[0125] Additionally, one of ordinary skill in the art will readily recognize that the terms "upper" and "lower" are sometimes used for ease of describing the drawings and indicate relative positions corresponding to the orientation of the drawings on a correctly oriented page, and may not reflect the correct orientation of any device as implemented.

[0126] Certain features described in this specification in the context of separate implementations may also be implemented in combination in a single implementation. Conversely, various features described in the context of a single implementation may also be implemented in multiple implementations, either individually or in any suitable subcombination. Furthermore, while features may be described above as functioning in certain combinations and even initially claimed as such, one or more features from a claimed combination may in some cases be removed from the combination, and a claimed combination may be directed to subcombinations or variations of subcombinations.

[0127] Similarly, although the operations are depicted in a specific order in the accompanying drawings, this should not be understood as requiring such operations to be performed in the specific order shown or in a sequential order, or to perform all illustrated operations to achieve the desired result. In addition, the accompanying drawings can schematically depict one or more example processes in the form of a flow chart. However, other operations that are not depicted can be combined in the schematically illustrated example process. For example, one or more additional operations can be performed before, after, at the same time, or between any illustrated operations. In some environments, multitasking and parallel processing are advantageous. In addition, the separation of various system components in the specific implementation described above should not be understood as requiring such separation in all specific implementations, and it should be understood that the described program components and systems can generally be integrated together in a single software product or packaged into multiple software products. Additionally, some other specific implementations also fall within the scope of the appended claims. In some cases, the actions narrated in the claims can be performed in different orders and still achieve the desired result.

[0128] As used herein, including in the claims, the term "or" used in a list of two or more items means that any of the listed items may be employed alone, or any combination of two or more of the listed items may be employed. For example, if a composition is described as containing components A, B, or C, the composition may contain A alone; B alone; C alone; A and B combined; A and C combined; B and C combined; or A, B, and C combined. In addition, as used herein, including in the claims, "or" as used in a list of items beginning with "at least one" indicates a separate list, so that, for example, a list of "at least one of A, B, or C" means A or B or C or AB or AC or BC or ABC (i.e., A and B and C) or any combination of any of these. The term "substantially" is defined as to a large extent, but not necessarily entirely, what is specified (and includes what is specified; for example, substantially 90 degrees includes 90 degrees, and substantially parallel includes parallel), as understood by one of ordinary skill in the art. In any disclosed implementation, the term "substantially" may be replaced with "within [percentage] of" the specified content, where percentages include 0.1%, 1%, 5%, or 10%. As used herein, the phrase "based on" should not be interpreted as referring to a closed set of information, one or more conditions, one or more factors, etc. In other words, the phrase "based on A" (where "A" can be information, a condition, a factor, etc.) should be interpreted as "based on at least A" unless specifically stated differently. Similarly, as used herein, the phrase "set" should be understood to include the possibility of a set having one member. That is, the phrase "set" should be understood in the same manner as "one or more" or "at least one".

[0129] The previous description of the disclosure is provided to enable any person skilled in the art to make or use the disclosure. Various modifications to the disclosure will be apparent to those skilled in the art, and the general principles defined herein may be applied to other variations without departing from the spirit or scope of the disclosure. Therefore, the disclosure is not intended to be limited to the examples and designs described herein, but to be consistent with the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A method of wireless communication performed by a user equipment (UE), the method comprising: determining that a first PRACH transmission opportunity occurs during a first time period, wherein the first time period is a first time period in which the UE is configured to transmit a PRACH transmission using a first beam; determining that a second PRACH transmission opportunity occurs during a second time period, wherein the second time period is a second time period during which the UE is configured to transmit a PRACH transmission using a second beam different from the first beam; Based on determining that the first PRACH transmission opportunity occurs during the first time period, sending a first PRACH transmission at the first PRACH transmission opportunity using the first beam; as well as Based on determining that the second PRACH transmission opportunity occurs during the second time period, a second PRACH transmission is transmitted at the second PRACH transmission opportunity using the second beam, wherein the second PRACH transmission is a repetition of the first PRACH transmission.

2. The method according to claim 1, further comprising: Determining that a third PRACH transmission opportunity occurs during the first time period; as well as based on determining that the third PRACH transmission opportunity occurs during the first time period, transmitting a third PRACH transmission at the third PRACH transmission opportunity using the first beam, The third PRACH transmission is a repetition of the first PRACH transmission.

3. The method according to claim 1, further comprising: determining a coherence time for the UE, determining the first time period based on the coherence time; as well as determining the second time period based on the coherence time, Wherein a first duration of the coherence time is equal to a second duration of the first time period and a third duration of the second time period.

4. The method of claim 3, wherein determining the coherence time comprises at least one of: reading the coherence time from a memory of the UE; or An indication of the coherence time is received from a first network node.

5. The method of claim 4, wherein receiving the indication of the coherence time from the first network node comprises at least one of: receiving the indication of the coherence time in a system information block one (SIB1) transmission from the first network node; or The indication of the coherence time is received in a radio resource control (RRC) transmission from the first network node.

6. The method of claim 3, wherein the coherence time is determined based on at least one of the following: The frequency range of the UE; a frequency band of the UE; The PRACH format of the UE; or A time domain window (TDW) for demodulation reference signal (DMRS) bundling of the UE.

7. The method according to claim 1, further comprising: determining a number of multiple message three (Msg3) transmissions associated with the first PRACH transmission and the second PRACH transmission; transmitting a first set of the plurality of Msg3 transmissions using the first beam based on the number of the plurality of Msg3 transmissions and the transmission of the first PRACH transmission using the first beam; as well as transmitting a second set of the plurality of Msg3 transmissions using the second beam based on the number of the plurality of Msg3 transmissions and the transmission of the second PRACH transmission using the second beam, The second set includes one or more repetitions of the first Msg3 sent in the first set.

8. The method of claim 7, wherein determining the amount comprises at least one of: receiving the amount in a message two (Msg2) sent from the first network node; or The number is received in a downlink control information (DCI) transmission from the first network node.

9. A user equipment (UE), the user equipment (UE) comprising: Memory; as well as at least one processor coupled to the memory, wherein the at least one processor is configured to: determining that a first PRACH transmission opportunity occurs during a first time period, wherein the first time period is a first time period in which the UE is configured to transmit a PRACH transmission using a first beam; determining that a second PRACH transmission opportunity occurs during a second time period, wherein the second time period is a second time period during which the UE is configured to transmit a PRACH transmission using a second beam different from the first beam; Based on determining that the first PRACH transmission opportunity occurs during the first time period, sending a first PRACH transmission at the first PRACH transmission opportunity using the first beam; as well as Based on determining that the second PRACH transmission opportunity occurs during the second time period, a second PRACH transmission is transmitted at the second PRACH transmission opportunity using the second beam, wherein the second PRACH transmission is a repetition of the first PRACH transmission.

10. The UE of claim 9, wherein the at least one processor is further configured to: determining that a third PRACH transmission opportunity occurs during the first time period; and based on determining that the third PRACH transmission opportunity occurs during the first time period, transmitting a third PRACH transmission at the third PRACH transmission opportunity using the first beam, The third PRACH transmission is a repetition of the first PRACH transmission.

11. The UE of claim 9, wherein the at least one processor is further configured to: determining a coherence time for the UE; determining the first time period based on the coherence time; and determining the second time period based on the coherence time, Wherein a first duration of the coherence time is equal to a second duration of the first time period and a third duration of the second time period.

12. The UE of claim 11, wherein the at least one processor is configured to determine the coherence time by at least one of: reading a coherence time from the memory of the UE; or An indication of the coherence time is received from a first network node.

13. The UE of claim 12, wherein the at least one processor is configured to receive the indication of the coherence time from the first network node by at least one of: receiving the indication of the coherence time in a system information block one (SIB1) transmission from the first network node; or The indication of the coherence time is received in a radio resource control (RRC) transmission from the first network node.

14. The UE of claim 11, wherein the at least one processor is configured to determine the coherence time based on at least one of the following: The frequency range of the UE; a frequency band of the UE; The PRACH format of the UE; or A time domain window (TDW) for demodulation reference signal (DMRS) bundling of the UE.

15. The UE of claim 9, wherein the at least one processor is further configured to: determining a number of multiple message three (Msg3) transmissions associated with the first PRACH transmission and the second PRACH transmission; transmitting a first set of the plurality of Msg3 transmissions using the first beam based on the number of the plurality of Msg3 transmissions and the transmission of the first PRACH transmission using the first beam; and transmitting a second set of the plurality of Msg3 transmissions using the second beam based on the number of the plurality of Msg3 transmissions and the transmission of the second PRACH transmission using the second beam, The second set includes one or more repetitions of the first Msg3 sent in the first set.

16. The UE of claim 15, wherein the at least one processor is configured to determine the number by at least one of: receiving the amount in a message two (Msg2) sent from the first network node; or The number is received in a downlink control information (DCI) transmission from the first network node.

17. A method of wireless communication performed by a first network node, the method comprising: determining a coherence time for a user equipment (UE) based on one or more transmit parameters of the UE; sending an indication of the coherence time to the UE; as well as After sending the indication of the coherence time, receiving a first physical random access channel (PRACH) transmission from the UE using a first beam at a first PRACH transmission opportunity.

18. The method of claim 17, wherein the first PRACH transmission is transmitted by the UE using the first beam at the first PRACH transmission opportunity based on a determination by the UE that the first PRACH transmission opportunity occurs during a first time period, and wherein the first time period is determined by the UE based on the coherence time.

19. The method according to claim 18, further comprising: and receiving a second physical random access channel (PRACH) transmission from the UE using the first beam at a second PRACH transmission opportunity, wherein the second PRACH transmission is transmitted by the UE using the first beam at the second PRACH transmission opportunity based on a determination by the UE that the second PRACH transmission opportunity occurs during the first time period, and wherein the second PRACH transmission is a repetition of the first PRACH transmission.

20. The method according to claim 17, wherein the one or more transmission parameters of the UE include at least one of the following items: The frequency range of the UE; a frequency band of the UE; The PRACH format of the UE; or A time domain window (TDW) for demodulation reference signal (DMRS) bundling of the UE.

21. The method of claim 17, wherein sending the indication of the coherence time to the UE comprises at least one of: sending said indication of said coherence time in a system information block one (SIB1) transmission; or The indication of the coherence time is sent in a radio resource control (RRC) transmission.

22. The method according to claim 17, further comprising: sending, to the UE, a number of a plurality of message three (Msg3) transmissions associated with the first PRACH transmission to be sent by the UE; as well as Receive a first set of the multiple Msg3 transmissions sent by the UE using the first beam, wherein the first set of the multiple Msg3 transmissions is sent by the UE based on the number of the multiple Msg3 transmissions and the first PRACH transmission performed using the first beam.

23. The method of claim 22, wherein sending the amount comprises at least one of: Sending the amount in message 2 (Msg2); or The number is sent in a downlink control information (DCI) transmission.

24. A first network node, the first network node comprising: Memory; as well as at least one processor coupled to the memory, wherein the at least one processor is configured to: determining a coherence time for a user equipment (UE) based on one or more transmit parameters of the UE; sending an indication of the coherence time to the UE; as well as After sending the indication of the coherence time, receiving a first physical random access channel (PRACH) transmission from the UE using a first beam at a first PRACH transmission opportunity.

25. The first network node of claim 24, wherein the first PRACH transmission is transmitted by the UE using the first beam at the first PRACH transmission opportunity based on a determination by the UE that the first PRACH transmission opportunity occurs during a first time period, and wherein the first time period is determined by the UE based on the coherence time.

26. The first network node of claim 25, wherein the at least one processor is further configured to: and receiving a second physical random access channel (PRACH) transmission from the UE using the first beam at a second PRACH transmission opportunity, wherein the second PRACH transmission is transmitted by the UE using the first beam at the second PRACH transmission opportunity based on a determination by the UE that the second PRACH transmission opportunity occurs during the first time period, and wherein the second PRACH transmission is a repetition of the first PRACH transmission.

27. The first network node according to claim 24, wherein the one or more transmission parameters of the UE include at least one of the following: The frequency range of the UE; a frequency band of the UE; The PRACH format of the UE; or A time domain window (TDW) for demodulation reference signal (DMRS) bundling of the UE.

28. The first network node of claim 24, wherein the at least one processor is configured to send the indication of the coherence time to the UE by at least one of: sending said indication of said coherence time in a system information block one (SIB1) transmission; or The indication of the coherence time is sent in a radio resource control (RRC) transmission.

29. The first network node of claim 24, wherein the at least one processor is further configured to: sending to the UE a number of a plurality of message three (Msg3) transmissions associated with the first PRACH transmission to be sent by the UE; and Receive a first set of the multiple Msg3 transmissions sent by the UE using the first beam, wherein the first set of the multiple Msg3 transmissions is sent by the UE based on the number of the multiple Msg3 transmissions and the first PRACH transmission performed using the first beam.

30. The first network node of claim 29, wherein the at least one processor is further configured to send the number of the plurality of Msg3 transmissions by at least one of: Sending the amount in message 2 (Msg2); or The number is sent in a downlink control information (DCI) transmission.

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