Indicating user equipment capabilities using a random access preamble

Abstract

Various aspects of the present disclosure generally relate to wireless communications. In some aspects, a user equipment (UE) may transmit a physical random access channel (PRACH) preamble to a base station. At least one property associated with the PRACH preamble corresponds to a request for repetition of Msg3. Thus, the UE may transmit two or more repetitions of Msg3 to the base station based at least in part on the random access preamble. Numerous other aspects are provided.

Description

[Technical Field]

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS This patent application claims priority to U.S. Provisional Patent Application No. 63 / 111,264, entitled "INDICATING USER EQUIPMENT CAPABILITY USING RANDOM ACCESS PREAMBLES," filed November 9, 2020, and U.S. Non-Provisional Patent Application No. 17 / 453,722, entitled "INDICATING USER EQUIPMENT CAPABILITY USING RANDOM ACCESS PREAMBLES," filed November 5, 2021, which are expressly incorporated herein by reference.

[0002] Aspects of the present disclosure relate generally to wireless communications and to techniques and apparatus for indicating user equipment capabilities using a random access preamble. [Background technology]

[0003] Wireless communication systems are widely deployed to provide various telecommunication services such as telephony, video, data, messaging, and broadcasts. A typical wireless communication system may employ multiple-access technologies capable of supporting communication with multiple users by sharing available system resources (e.g., bandwidth, transmit power, etc.). Examples of such multiple-access technologies include code division multiple access (CDMA) systems, time division multiple access (TDMA) systems, frequency division multiple access (FDMA) systems, orthogonal frequency division multiple access (OFDMA) systems, single-carrier frequency division multiple access (SC-FDMA) systems, time division synchronous code division multiple access (TD-SCDMA) systems, and Long Term Evolution (LTE). LTE / LTE-Advanced is a set of extensions to the Universal Mobile Telecommunications System (UMTS) mobile standard promulgated by the 3rd Generation Partnership Project (3GPP®).

[0004] A wireless network may include one or more base stations that support communication for a user equipment (UE) or multiple UEs. A UE may communicate with a base station via downlink and uplink communications. "Downlink" (or "DL") refers to the communication link from a base station to a UE, and "uplink" (or "UL") refers to the communication link from a UE to a base station.

[0005] The above multiple access technologies have been adopted in various telecommunications standards to provide common protocols that enable different UEs to communicate on a city, national, regional, and / or global scale. New Radio (NR), sometimes referred to as 5G, is a set of extensions to the LTE mobile standard promulgated by 3GPP. NR is designed to better support mobile broadband Internet access by improving spectral efficiency, lowering costs, improving service, utilizing new spectrum, and using Orthogonal Frequency Division Multiplexing (OFDM) with Cyclic Prefix (CP) (CP-OFDM) on the downlink and CP-OFDM and / or Single Carrier Frequency Division Multiplexing (SC-FDM) (also known as Discrete Fourier Transform Spread OFDM (DFT-s-OFDM)) on the uplink, as well as better integration with other open standards that support beamforming, multiple-input multiple-output (MIMO) antenna technology, and carrier aggregation. As demand for mobile broadband access continues to grow, further improvements in LTE, NR, and other radio access technologies remain useful. Summary of the Invention [Means for solving the problem]

[0006] Certain aspects described herein relate to a method of wireless communication performed by a user equipment (UE). The method may include transmitting, to a base station, a physical random access channel (PRACH) preamble, wherein at least one property associated with the PRACH preamble corresponds to a request for Msg3 repetition. The method may further include transmitting, to the base station, two or more repetitions of Msg3 based at least in part on the random access preamble.

[0007] Certain aspects described herein relate to a method of wireless communication performed by a base station. The method may include receiving, from a UE, a PRACH preamble, where at least one property associated with the PRACH preamble corresponds to a request for Msg3 repetition. The method may further include receiving, from the UE, two or more repetitions of Msg3 based at least in part on the random access preamble.

[0008] Some aspects described herein relate to an apparatus for wireless communication in a UE. The apparatus may include a memory and one or more processors coupled to the memory. The one or more processors may be configured to transmit, to a base station, a PRACH preamble, where at least one property associated with the PRACH preamble corresponds to a request for Msg3 repetition. The one or more processors may be further configured to transmit, to the base station, two or more repetitions of Msg3 based at least in part on the random access preamble.

[0009] Some aspects described herein relate to an apparatus for wireless communication in a base station. The apparatus may include a memory and one or more processors coupled to the memory. The one or more processors may be configured to receive, from a UE, a PRACH preamble, where at least one property associated with the PRACH preamble corresponds to a request for Msg3 repetition. The one or more processors may be further configured to receive, from the UE, two or more repetitions of Msg3 based at least in part on the random access preamble.

[0010] Certain aspects described herein relate to a non-transitory computer-readable medium storing a set of instructions for wireless communication by a UE. The set of instructions, when executed by one or more processors of the UE, may cause the UE to transmit, to a base station, a PRACH preamble, where at least one property associated with the PRACH preamble corresponds to a request for Msg3 repetition. The set of instructions, when executed by the one or more processors of the UE, may further cause the UE to transmit, to the base station, two or more repetitions of Msg3 based at least in part on the random access preamble.

[0011] Certain aspects described herein relate to a non-transitory computer-readable medium storing a set of instructions for wireless communication by a base station. The set of instructions, when executed by one or more processors of the base station, may cause the base station to receive, from a UE, a PRACH preamble, where at least one property associated with the PRACH preamble corresponds to a request for Msg3 repetition. The set of instructions, when executed by the one or more processors of the base station, may further cause the base station to receive, from the UE, two or more repetitions of Msg3 based at least in part on the random access preamble.

[0012] Certain aspects described herein relate to an apparatus for wireless communication. The apparatus may include means for transmitting a PRACH preamble to a base station, wherein at least one property associated with the PRACH preamble corresponds to a request for Msg3 repetition. The apparatus may further include means for transmitting, to the base station, two or more repetitions of Msg3 based at least in part on the random access preamble.

[0013] Certain aspects described herein relate to an apparatus for wireless communication. The apparatus may include means for receiving a PRACH preamble from a UE, where at least one property associated with the PRACH preamble corresponds to a request for Msg3 repetition. The apparatus may further include means for receiving, from the UE, two or more repetitions of Msg3 based at least in part on the random access preamble.

[0014] Aspects generally include methods, apparatus, systems, computer program products, non-transitory computer-readable media, user equipment, base stations, wireless communication devices, and / or processing systems as fully described herein with reference to and as illustrated by the drawings and this specification.

[0015] The foregoing has outlined rather broadly the features and technical advantages of examples according to the present disclosure so that the following detailed description may be better understood. Additional features and advantages are described below. The concepts and examples disclosed may be readily utilized as a basis for modifying or designing other structures for carrying out the same purposes of the present disclosure. Such equivalent structures do not depart from the scope of the appended claims. The nature of the concepts disclosed herein, both their organization and method of operation, together with associated advantages, will be better understood from the following description when considered in conjunction with the accompanying figures. Each of the figures is provided for the purpose of illustration and description, and not as a definition of the limits of the claims.

[0016] Although aspects are described in this disclosure by illustrating some examples, those skilled in the art will understand that such aspects can be implemented in many different configurations and scenarios. The techniques described herein may be implemented using different platform types, devices, systems, shapes, sizes, and / or packaging configurations. For example, some aspects may be implemented via integrated chip embodiments or other non-modular component-based devices (e.g., end-user devices, vehicles, communications devices, computing devices, industrial equipment, retail / purchasing devices, medical devices, and / or artificial intelligence devices). Aspects may be implemented in chip-level components, modular components, non-modular components, non-chip-level components, device-level components, and / or system-level components. Devices incorporating the described aspects and features may include additional components and features for the implementation and practice of the claimed and described aspects. For example, transmission and reception of wireless signals may include one or more components for analog and digital applications (e.g., hardware components including antennas, radio frequency (RF) chains, power amplifiers, modulators, buffers, processors, interleavers, adders, and / or summers). It is contemplated that the aspects described herein may be practiced in a wide variety of devices, components, systems, distributed configurations, and / or end-user devices of various sizes, shapes, and configurations.

[0017] So that the above-listed features of the present disclosure may be understood in detail, a more detailed description briefly summarized above may be had by reference to embodiments, some of which are shown in the accompanying drawings. However, since the present description may admit of other equally effective embodiments, it should be noted that the accompanying drawings illustrate only some typical embodiments of the present disclosure and therefore should not be considered limiting of its scope. The same reference numbers in different drawings may identify the same or similar elements. [Brief explanation of the drawings]

[0018] [Figure 1] FIG. 1 illustrates an example of a wireless network according to the present disclosure. [Figure 2] FIG. 1 illustrates an example of a base station in communication with a user equipment (UE) in a wireless network, according to the present disclosure. [Figure 3] FIG. 1 illustrates an example of a four-step random access procedure according to the present disclosure. [Figure 4A] FIG. 10 illustrates an example of a repetition type for a UE according to the present disclosure. [Figure 4B] FIG. 10 illustrates an example of a repetition type for a UE according to the present disclosure. [Figure 5] FIG. 1 illustrates an example associated with indicating UE capabilities using a random access preamble, according to the present disclosure. [Figure 6] FIG. 1 illustrates an example process associated with indicating UE capabilities using a random access preamble, in accordance with the present disclosure. [Figure 7] FIG. 1 illustrates an example process associated with indicating UE capabilities using a random access preamble, in accordance with the present disclosure. [Figure 8] FIG. 1 is a diagram of an exemplary apparatus for wireless communication according to the present disclosure. [Figure 9] FIG. 1 is a diagram of an exemplary apparatus for wireless communication according to the present disclosure. DETAILED DESCRIPTION OF THE INVENTION

[0019] Various aspects of the present disclosure are described more fully below with reference to the accompanying drawings. However, the present disclosure may be embodied in many different forms and should not be construed as limited to any specific structure or function presented throughout this disclosure. Rather, these aspects are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art. Those skilled in the art will appreciate that the scope of the present disclosure encompasses any aspect of the present disclosure disclosed herein, whether implemented independently or in combination with any other aspect of the present disclosure. For example, an apparatus may be implemented or a method may be practiced using any number of the aspects described herein. In addition, the scope of the present disclosure is intended to encompass such apparatuses or methods practiced using other structure, functions, or structure and functions in addition to or other than the various aspects of the present disclosure described herein. It should be understood that any aspect of the present disclosure disclosed herein may be embodied by one or more elements of a claim.

[0020] Several aspects of telecommunications systems will now be presented with reference to various apparatus and techniques. These apparatus and techniques are described in the following detailed description and illustrated in the accompanying drawings by various blocks, modules, components, circuits, steps, processes, algorithms, etc. (collectively referred to as "elements"). These elements may be implemented using hardware, software, or a combination thereof. Whether such elements are implemented as hardware or software depends on the particular application and design constraints imposed on the overall system.

[0021] Although aspects may be described herein using terminology commonly associated with 5G or New Radio (NR) radio access technologies (RATs), aspects of the present disclosure may apply to other RATs, such as 3G RATs, 4G RATs, and / or post-5G (e.g., 6G) RATs.

[0022] FIG. 1 illustrates an example of a wireless network 100 according to the present disclosure. The wireless network 100 may be or include elements of a 5G (e.g., NR) network and / or a 4G (e.g., Long Term Evolution (LTE)) network, among other examples. The wireless network 100 may include one or more base stations 110 (depicted as BS 110a, BS 110b, BS 110c, and BS 110d), user equipment (UE) 120 or multiple UEs 120 (depicted as UE 120a, UE 120b, UE 120c, UE 120d, and UE 120e), and / or other network entities. The base stations 110 are entities that communicate with the UEs 120. The base stations 110 (sometimes referred to as BSs) may include, for example, NR base stations, LTE base stations, Node Bs, eNBs (e.g., in 4G), gNBs (e.g., in 5G), access points, and / or transmit receiving points (TRPs). Each base station 110 may provide communication coverage for a particular geographic area. In the Third Generation Partnership Project (3GPP®), the term “cell” can refer to the coverage area of ​​a base station 110 and / or a base station subsystem serving that coverage area, depending on the context in which the term is used.

[0023] A base station 110 may provide communication coverage for a macro cell, a pico cell, a femto cell, and / or another type of cell. A macro cell may cover a relatively large geographic area (e.g., a few kilometers in radius) and may allow unrestricted access by UEs 120 with service subscriptions. A pico cell may cover a relatively small geographic area and may allow unrestricted access by UEs 120 with service subscriptions. A femto cell may cover a relatively small geographic area (e.g., a home) and may allow restricted access by UEs 120 that have an association with the femto cell (e.g., UEs 120 in a Closed Subscriber Group (CSG)). A base station 110 for a macro cell may be referred to as a macro base station. A base station 110 for a pico cell may be referred to as a pico base station. A base station 110 for a femto cell may be referred to as a femto base station or an intra-home base station. 1, BS 110a may be a macro base station for a macro cell 102a, BS 110b may be a pico base station for a pico cell 102b, and BS 110c may be a femto base station for a femto cell 102c. A base station may support one or multiple (e.g., three) cells.

[0024] In some examples, the cells may not necessarily be stationary, and the geographic area of ​​the cells may move according to the location of the base station 110 that is mobile (e.g., a mobile base station). In some examples, the base stations 110 may be interconnected to each other and / or to one or more other base stations 110 or network nodes (not shown) in the wireless network 100 through various types of backhaul interfaces, such as direct physical connections or virtual networks, using any suitable transport network.

[0025] Wireless network 100 may include one or more relay stations. A relay station is an entity that can receive a data transmission from an upstream station (e.g., base station 110 or UE 120) and send the data transmission to a downstream station (e.g., UE 120 or base station 110). A relay station may be a UE 120 that can relay transmissions for other UEs 120. In the example shown in FIG. 1, BS 110d (e.g., a relay base station) may communicate with BS 110a (e.g., a macro base station) and UE 120d to facilitate communication between BS 110a and UE 120d. A base station 110 that relays communication may be referred to as a relay station, a relay base station, a relay, etc.

[0026] Wireless network 100 may be a heterogeneous network including different types of base stations 110, such as macro base stations, pico base stations, femto base stations, and relay base stations. These different types of base stations 110 may have different transmit power levels, different coverage areas, and / or different susceptibility to interference in wireless network 100. For example, macro base stations may have high transmit power levels (e.g., 5-40 watts), while pico base stations, femto base stations, and relay base stations may have lower transmit power levels (e.g., 0.1-2 watts).

[0027] Network controller 130 may couple to or communicate with a set of base stations 110 and may provide coordination and control for these base stations 110. Network controller 130 may communicate with base stations 110 via backhaul communication links. Base stations 110 may communicate with each other directly or indirectly via wireless or wireline backhaul communication links.

[0028] The UEs 120 may be dispersed throughout the wireless network 100, and each UE 120 may be fixed or mobile. The UEs 120 may include, for example, an access terminal, a terminal, a mobile station, and / or a subscriber unit. The UEs 120 may be a cellular phone (e.g., a smartphone), a personal digital assistant (PDA), a wireless modem, a wireless communication device, a handheld device, a laptop computer, a cordless phone, a wireless local loop (WLL) station, a tablet, a camera, a gaming device, a netbook, a smartbook, an ultrabook, a medical device, a biometric device, a wearable device (e.g., a smart watch, smart clothing, smart glasses, a smart wristband, smart jewelry (e.g., a smart ring or a smart bracelet)), an entertainment device (e.g., a music device, a video device, and / or a satellite radio), a vehicle component or sensor, a smart meter / sensor, industrial manufacturing equipment, a global positioning system device, and / or any other suitable device configured to communicate over a wireless medium.

[0029] Some UEs 120 may be considered machine type communication (MTC) UEs or evolved or enhanced machine type communication (eMTC) UEs. MTC UEs and / or eMTC UEs may include, for example, a robot, a drone, a remote device, a sensor, a meter, a monitor, and / or a location tag that may communicate with a base station, another device (e.g., a remote device), or some other entity. Some UEs 120 may be considered Internet of Things (IoT) devices and / or may be implemented as NB-IoT (narrowband IoT) devices. Some UEs 120 may be considered customer premises equipment. The UE 120 may be included within a housing that houses components of the UE 120, such as a processor component and / or a memory component. In some examples, the processor component and the memory component may be coupled to each other. For example, the processor component (e.g., one or more processors) and the memory component (e.g., a memory) may be operatively coupled, communicatively coupled, electronically coupled, and / or electrically coupled.

[0030] In general, any number of wireless networks 100 may be deployed in a given geographic area. Each wireless network 100 may support a particular RAT and may operate on one or more frequencies. A RAT may be referred to as a radio technology, air interface, etc. A frequency may be referred to as a carrier, frequency channel, etc. Each frequency may support a single RAT in a given geographic area to avoid interference between wireless networks of different RATs. In some cases, NR or 5G RAT networks may be deployed.

[0031] In some examples, two or more UEs 120 (e.g., shown as UE 120a and UE 120e) may communicate directly (e.g., without using the base station 110 as an intermediary for communicating with each other) using one or more sidelink channels. For example, the UEs 120 may communicate using peer-to-peer (P2P) communication, device-to-device (D2D) communication, vehicle-to-everything (V2X) protocols (which may include, e.g., vehicle-to-vehicle (V2V) protocols, vehicle-to-infrastructure (V2I) protocols, or vehicle-to-pedestrian (V2P) protocols), and / or mesh networks. In such examples, the UEs 120 may perform scheduling operations, resource selection operations, and / or other operations described elsewhere herein as being performed by the base station 110.

[0032] Devices of wireless network 100 may communicate using an electromagnetic spectrum, which may be subdivided by frequency or wavelength into various classes, bands, channels, etc. For example, devices of wireless network 100 may communicate using one or more operating bands. In 5G NR, two initial operating bands have been identified as frequency range designations FR1 (410 MHz to 7.125 GHz) and FR2 (24.25 GHz to 52.6 GHz). It should be understood that although a portion of FR1 is above 6 GHz, FR1 is often referred to (interchangeably) as the “sub-6 GHz” band in various documents and papers. Similar nomenclature issues may arise with respect to FR2, which is often referred to (interchangeably) as the “millimeter wave” band in documents and papers, even though it is different from the extremely high frequency (EHF) band (30 GHz to 300 GHz) identified by the International Telecommunications Union (ITU) as the “millimeter wave” band.

[0033] Frequencies between FR1 and FR2 are often referred to as mid-band frequencies. Recent 5G NR studies have identified operating bands for these mid-band frequencies as the frequency range designated FR3 (7.125 GHz to 24.25 GHz). Frequency bands falling within FR3 may inherit FR1 and / or FR2 characteristics, thus effectively extending the features of FR1 and / or FR2 to the mid-band frequencies. In addition, higher frequency bands are currently being considered to extend 5G NR operation beyond 52.6 GHz. For example, three higher operating bands have been identified as frequency ranges designated FR4a or FR4-1 (52.6 GHz to 71 GHz), FR4 (52.6 GHz to 114.25 GHz), and FR5 (114.25 GHz to 300 GHz). Each of these higher frequency bands falls within the EHF band.

[0034] With the above examples in mind, it should be understood that, unless otherwise specified, terms such as "sub-6 GHz," as used herein, may broadly refer to frequencies that may be below 6 GHz, may be within FR1, or may include mid-band frequencies. Furthermore, unless otherwise specified, it should be understood that terms such as "millimeter wave," as used herein, may broadly refer to frequencies that may include mid-band frequencies, may be within FR2, FR4, FR4-a or FR4-1, and / or FR5, or may be within the EHF band. It is contemplated that the frequencies included in these operating bands (e.g., FR1, FR2, FR3, FR4, FR4-a, FR4-1, and / or FR5) may be modified, and the techniques described herein are applicable to those modified frequency ranges.

[0035] As noted above, Figure 1 is provided as an example. Other examples may differ from those described with respect to Figure 1.

[0036] 2 is a diagram illustrating an example base station 110 200 in communication with a UE 120 in a wireless network 100 in accordance with the present disclosure. The base station 110 may be equipped with a set of antennas 234a through 234t, such as T antennas, where T≧1. The UE 120 may be equipped with a set of antennas 252a through 252r, such as R antennas, where R≧1.

[0037] At the base station 110, the transmit processor 220 may receive data destined for the UE 120 (or set of UEs 120) from the data source 212. The transmit processor 220 may select one or more modulation and coding schemes (MCSs) for the UE 120 based at least in part on one or more channel quality indicators (CQIs) received from the UE 120. The base station 110 may process (e.g., encode and modulate) data for the UE 120 based at least in part on the MCS selected for the UE 120 and may provide data symbols to the UE 120. The transmit processor 220 may process system information and control information (e.g., CQI requests, grants, and / or higher layer signaling) (e.g., for semi-static resource partitioning information (SRPI)) and provide overhead symbols and control symbols. The transmit processor 220 may generate reference symbols for a reference signal (e.g., a cell-specific reference signal (CRS) or a demodulation reference signal (DMRS)) and a synchronization signal (e.g., a primary synchronization signal (PSS) or a secondary synchronization signal (SSS)). The transmit (TX) multiple-input multiple-output (MIMO) processor 230 may perform spatial processing (e.g., precoding) on ​​the data symbols, control symbols, overhead symbols, and / or reference symbols, if applicable, and may provide a set of output symbol streams (e.g., T output symbol streams) to a corresponding set of modems 232 (e.g., T modems), denoted as modems 232a through 232t. For example, each output symbol stream may be provided to a modulator component (denoted as MOD) of modem 232. Each modem 232 may process a respective output symbol stream (e.g., for OFDM) using a respective modulator component to obtain an output sample stream. Each modem 232 may further process (eg, convert to analog, amplify, filter, and / or upconvert) the output sample stream using a respective modulator component to obtain a downlink signal.Modems 232a through 232t may transmit a set of downlink signals (eg, T downlink signals) via a corresponding set of antennas 234 (eg, T antennas), which are depicted as antennas 234a through 234t.

[0038] At the UE 120, a set of antennas 252 (denoted as antennas 252a through 252r) may receive downlink signals from the base station 110 and / or other base stations 110 and may provide a set of received signals (e.g., R received signals) to a set of modems 254 (e.g., R modems) denoted as modems 254a through 254r. For example, each received signal may be provided to a demodulator component (denoted as DEMOD) of the modem 254. Each modem 254 may condition (e.g., filter, amplify, downconvert, and / or digitize) the received signal using its respective demodulator component to obtain input samples. Each modem 254 may further process the input samples (e.g., for OFDM) using the demodulator component to obtain received symbols. A MIMO detector 256 may obtain received symbols from the modems 254, perform MIMO detection on the received symbols, if applicable, and provide detected symbols. The receive processor 258 may process (e.g., demodulate and decode) the detected symbols, provide decoded data for the UE 120 to a data sink 260, and provide decoded control and system information to the controller / processor 280. The term “controller / processor” may refer to one or more controllers, one or more processors, or a combination thereof. The channel processor may determine a reference signal received power (RSRP) parameter, a received signal strength indicator (RSSI) parameter, a reference signal received quality (RSRQ) parameter, and / or a CQI parameter, among other examples. In some examples, one or more components of the UE 120 may be included in the housing 284.

[0039] The network controller 130 may include a communication unit 294, a controller / processor 290, and a memory 292. The network controller 130 may include, for example, one or more devices in a core network. The network controller 130 may communicate with the base stations 110 via the communication unit 294.

[0040] One or more antennas (e.g., antennas 234a-t and / or antennas 252a-r) may include or be contained within one or more antenna panels, one or more antenna groups, one or more sets of antenna elements, and / or one or more antenna arrays, among other examples. The antenna panels, antenna groups, sets of antenna elements, and / or antenna arrays may include one or more antenna elements (in a single housing or multiple housings), a set of coplanar antenna elements, a set of non-coplanar antenna elements, and / or one or more antenna elements coupled to one or more transmitting and / or receiving components, such as one or more components of FIG. 2.

[0041] On the uplink, at the UE 120, the transmit processor 264 may receive and process data from the data source 262 and control information from the controller / processor 280 (e.g., for reports including RSRP, RSSI, RSRQ, and / or CQI). The transmit processor 264 may generate reference symbols for one or more reference signals. The symbols from the transmit processor 264 may be precoded by the TX MIMO processor 266, if applicable, further processed by the modem 254 (e.g., for DFT-s-OFDM or CP-OFDM), and transmitted to the base station 110. In some examples, the modem 254 of the UE 120 may include a modulator and demodulator. In some examples, the UE 120 includes a transceiver. The transceiver may include any combination of the antennas 252, the modem 254, the MIMO detector 256, the receive processor 258, the transmit processor 264, and / or the TX MIMO processor 266. The transceiver may be used by a processor (e.g., controller / processor 280) and memory 282 to perform aspects of any of the methods described herein (e.g., with reference to Figures 5-9).

[0042] At the base station 110, uplink signals from the UE 120 and / or other UEs may be received by an antenna 234, processed by a modem 232 (e.g., a demodulator component of the modem 232, denoted as DEMOD), detected by a MIMO detector 236, if applicable, and further processed by a receive processor 238 to obtain decoded data and control information sent by the UE 120. The receive processor 238 may provide the decoded data to a data sink 239 and the decoded control information to a controller / processor 240. The base station 110 may include a communication unit 244 and may communicate with the network controller 130 via the communication unit 244. The base station 110 may include a scheduler 246 to schedule one or more UEs 120 for downlink and / or uplink communication. In some examples, the modem 232 of the base station 110 may include a modulator and a demodulator. In some examples, the base station 110 includes a transceiver. The transceiver may include any combination of antennas 234, modems 232, MIMO detectors 236, receive processors 238, transmit processors 220, and / or TX MIMO processors 230. The transceiver may be used by a processor (e.g., controller / processor 240) and memory 242 to perform aspects of any of the methods described herein (e.g., with reference to FIGS. 5-9).

[0043] The controller / processor 240 of the base station 110, the controller / processor 280 of the UE 120, and / or any other components of FIG. 2 may perform one or more techniques associated with indicating UE capabilities using a random access preamble, as described in more detail elsewhere herein. For example, the controller / processor 240 of the base station 110, the controller / processor 280 of the UE 120, and / or any other components of FIG. 2 may perform or direct the operation of, for example, process 600 of FIG. 6, process 700 of FIG. 7, and / or other processes as described herein. The memory 242 and the memory 282 may store data and program codes for the base station 110 and the UE 120, respectively. In some examples, the memory 242 and / or the memory 282 may include a non-transitory computer-readable medium that stores one or more instructions (e.g., code and / or program code) for wireless communication. For example, the one or more instructions, when executed (e.g., immediately or after being compiled, converted, and / or interpreted) by one or more processors of the base station 110 and / or the UE 120, may cause the one or more processors, the UE 120, and / or the base station 110 to perform or direct operations of, for example, process 600 of FIG. 6, process 700 of FIG. 7, and / or other processes described herein. In some examples, executing the instructions may include invoking the instructions, converting the instructions, compiling the instructions, and / or interpreting the instructions, among other examples.

[0044] In some aspects, a UE (e.g., UE 120 and / or apparatus 800 of FIG. 8) may include means for transmitting a physical random access channel (PRACH) preamble to a base station (e.g., base station 110 and / or apparatus 900 of FIG. 9), where at least one property associated with the PRACH preamble corresponds to a request for Msg3 repetition, and / or means for transmitting two or more repetitions of Msg3 to the base station based at least in part on the random access preamble. The means for the UE to perform the operations described herein may include, for example, one or more of antennas 252, modem 254, MIMO detector 256, receive processor 258, transmit processor 264, TX MIMO processor 266, controller / processor 280, or memory 282.

[0045] In some aspects, a base station (e.g., base station 110 and / or apparatus 900 of FIG. 9) may include means for receiving a PRACH preamble from a UE (e.g., UE 120 and / or apparatus 800 of FIG. 8), where at least one property associated with the PRACH preamble corresponds to a request for Msg3 repetition, and / or means for receiving two or more repetitions of Msg3 from the UE based at least in part on a random access preamble. The means for the base station to perform the operations described herein may include, for example, one or more of transmit processor 220, TX MIMO processor 230, modem 232, antenna 234, MIMO detector 236, receive processor 238, controller / processor 240, memory 242, or scheduler 246.

[0046] 2 are shown as separate components, the functionality described above with respect to the blocks may be implemented in a single hardware, software, or combined component, or in various combinations of components. For example, functionality described with respect to transmit processor 264, receive processor 258, and / or TX MIMO processor 266 may be performed by or under the control of controller / processor 280.

[0047] As noted above, Figure 2 is provided as an example. Other examples may differ from those described with respect to Figure 2.

[0048] 3 illustrates an example of a four-step random access procedure in accordance with the present disclosure. As shown in FIG. 3, a base station 110 and a UE 120 may communicate with each other to perform the four-step random access procedure.

[0049] As indicated by reference numeral 305, one or more synchronization signal blocks (SSBs) and random access configuration information may be transmitted by the base station 110 and received by the UE 120. In some aspects, the random access configuration information may be transmitted in and / or indicated by system information (e.g., in one or more system information blocks (SIBs)) and / or SSBs, such as for contention-based random access. Additionally or alternatively, the random access configuration information may be transmitted in a radio resource control (RRC) message and / or a physical downlink control channel (PDCCH) order message that triggers a random access channel (RACH) procedure, such as for contention-free random access. The random access configuration information may include one or more parameters to be used in the random access procedure, such as one or more parameters for transmitting a random access message (RAM) and / or one or more parameters for receiving a random access response (RAR).

[0050] As indicated by reference numeral 310, the UE 120 may transmit a RAM, which may include a preamble (sometimes referred to as a random access preamble, a PRACH preamble, or a RAM preamble). The message including the preamble may be referred to as message 1, msg1, MSG1, a first message, or an initial message in a four-step random access procedure. The random access message may include a random access preamble identifier.

[0051] As indicated by reference numeral 315, base station 110 may transmit an RAR in response to the preamble. A message including the RAR may be referred to as message 2, msg2, MSG2, or the second message in a four-step random access procedure. In some aspects, the RAR may indicate a detected random access preamble identifier (e.g., received from UE 120 in msg1). Additionally or alternatively, the RAR may indicate a resource allocation to be used by UE 120 to transmit message 3 (msg3).

[0052] In some aspects, as part of a second step of the four-step random access procedure, the base station 110 may transmit a PDCCH communication for the RAR. The PDCCH communication may schedule a physical downlink shared channel (PDSCH) communication that includes the RAR. For example, the PDCCH communication may indicate a resource allocation for the PDSCH communication. Also, as part of the second step of the four-step random access procedure, the base station 110 may transmit a PDSCH communication for the RAR as scheduled by the PDCCH communication. The RAR may be included in a medium access control (MAC) protocol data unit (PDU) of the PDSCH communication.

[0053] As indicated by reference numeral 320, the UE 120 may transmit an RRC connection request message. The RRC connection request message may be referred to as message 3, msg3, MSG3, or the third message of the four-step random access procedure. In some aspects, the RRC connection request may include a UE identifier, uplink control information (UCI), and / or a physical uplink shared channel (PUSCH) communication (e.g., an RRC connection request).

[0054] As indicated by reference numeral 325, the base station 110 may transmit an RRC connection setup message. The RRC connection setup message may be referred to as message 4, msg4, MSG4, or the fourth message of the four-step random access procedure. In some aspects, the RRC connection setup message may include a detected UE identifier, a timing advance value, and / or contention resolution information. As indicated by reference numeral 330, if the UE 120 successfully receives the RRC connection setup message, the UE 120 may transmit a hybrid automatic repeat request (HARQ) acknowledgment (ACK).

[0055] As noted above, Figure 3 is provided as an example. Other examples may differ from those described with respect to Figure 3.

[0056] 4A and 4B are diagrams illustrating example repetition types 400 and 450, respectively, for a UE in accordance with the present disclosure. The repetitions illustrated in FIGS. 4A and 4B may be used for uplink communications from a UE (e.g., UE 120) to a base station (e.g., base station 110). Accordingly, UE 120 may repeat uplink communications across symbols to increase reliability of communications to base station 110. Example 400 illustrates repetition type A (e.g., used by UE 120 for PUSCH communications), and example 450 illustrates repetition type B (e.g., used by UE 120 for PUSCH communications). Other repetition types may include, for example, repetition across symbols in non-contiguous slots and / or repetition across symbols in consecutive slots (e.g., as shown in FIG. 4A) or non-contiguous slots that also cross slot boundaries (e.g., as shown in FIG. 4B).

[0057] As shown in FIG. 4A, repetition type A may include several repetitions (represented by K in example 400) applied across consecutive slots. In example 400, K=2, but the description similarly applies to a larger number of repetitions (e.g., three, four, five, etc.). Repetition type A may further be defined by a starting symbol (represented by S in example 400) and a length (represented by L in example 400). Thus, the repetitions shown in FIG. 4A are for a four-symbol transmission (L=4) (e.g., transmission 401 in the first slot, represented by n) starting after the tenth symbol (S=10) in each slot. UE 120 may then repeat the four-symbol transmission in the tenth symbol of one or more additional slots (e.g., transmission 403 in a subsequent slot, represented by n+1) until UE 120 has repeated the transmission for K number of repetitions. In example 400, L=4, but the discussion applies equally to shorter transmissions (e.g., 1 symbol, 2 symbols, etc.) or longer transmissions (e.g., 5 symbols, 6 symbols, etc.). In example 400, S=10, but the discussion applies equally to earlier symbols (e.g., 9th symbol, 8th symbol, etc.) or later symbols (e.g., 11th symbol, 12th symbol, etc.). In some aspects, the repetition may be configured by a starting symbol and length indication from base station 110 (e.g., including two integers, including a single integer (also referred to as a start and length indicator value (SLIV)), and / or another similar indicator).

[0058] As shown in FIG. 4B, repetition type B may include several repetitions (represented by K in example 450) applied over consecutive groups of symbols. In example 450, K=2, but the description similarly applies to a larger number of repetitions (e.g., three, four, five, etc.). Repetition type B may further be defined by a starting symbol (represented by S in example 450) and a length (represented by L in example 450). Thus, the repetition shown in FIG. 4B is for a four-symbol transmission (L=4) (e.g., transmission 451 in a set of symbols in a slot represented by n) starting after the tenth symbol (S=10) in the first slot. UE 120 may then repeat the four-symbol transmission in each next group of four symbols (e.g., transmission 453 in a subsequent set of symbols in a slot represented by n+1) until UE 120 has repeated the transmission for K number of repetitions. In example 450, L=4, but the discussion applies equally to shorter transmissions (e.g., 1 symbol, 2 symbols, etc.) or longer transmissions (e.g., 5 symbols, 6 symbols, etc.). In example 450, S=10, but the discussion applies equally to earlier symbols (e.g., 9th symbol, 8th symbol, etc.) or later symbols (e.g., 11th symbol, 12th symbol, etc.). In some aspects, the repetition may be configured by a starting symbol and length indication from base station 110 (e.g., including two integers, including a single integer (e.g., SLIV), and / or another similar indicator).

[0059] As noted above, Figures 4A and 4B are provided as examples. Other examples may differ from those described with respect to Figures 4A and 4B.

[0060] A UE and / or a base station may experience reduced signal power when using millimeter wave (mmW) and / or other higher radio frequencies (e.g., FR2 and / or other frequencies) compared to FR1 frequencies, mid-band frequencies, and / or other lower radio frequencies. Therefore, a UE may repeat uplink transmissions to a base station when using such frequencies to increase reliability. However, legacy UEs are not configured to perform uplink repetitions, particularly for random access procedures (e.g., as described with respect to FIG. 3). Therefore, if a base station does not monitor for repetitions, non-legacy UEs will not be able to use such repetitions to increase reliability. Alternatively, if the base station attempts to decode repetitions from a legacy UE, the base station will waste network and processing resources.

[0061] Some techniques and apparatus described herein enable a UE (e.g., UE 120) to implicitly indicate to a base station (e.g., base station 110) one or more capabilities (e.g., repetition capabilities) associated with the UE 120 using a PRACH preamble. For example, the UE 120 may vary one or more properties associated with the PRACH preamble (e.g., one or more properties of the content and / or transmission of the PRACH preamble) to indicate the one or more capabilities to the base station 110. As a result, the UE 120 may use the repetitions to increase reliability by ensuring that the base station 110 will monitor for those repetitions. Additionally, the base station 110 will not consume network and processing resources monitoring for repetitions unless the UE 120 indicates such a capability to the base station 110.

[0062] 5 is a diagram illustrating an example 500 associated with indicating UE capabilities using a random access preamble in accordance with the present disclosure. As shown in FIG. 5, example 500 includes communication between base station 110 and UE 120. In some aspects, base station 110 and UE 120 may be included in a wireless network, such as wireless network 100.

[0063] As shown with reference to reference numeral 505, a random access preamble may be transmitted by UE 120 and received by base station 110, where at least one property associated with the random access preamble corresponds to at least one capability of UE 120 associated with the connection request. In some aspects, the random access preamble includes a PRACH preamble (e.g., as described with reference to FIG. 3). Accordingly, UE 120 may perform the process described with reference to FIG. 5 to establish a RACH with base station 110.

[0064] In some aspects, the at least one capability may include a repetition capability associated with the connection request. For example, the UE 120 may use the at least one property to indicate that the UE 120 has the capability to repeat the connection request (e.g., as described with reference to reference numeral 520). Thus, the UE 120 may use the at least one property to request repetition of Msg3 (which includes the connection request).

[0065] Additionally or alternatively, the at least one capability may include a cross-slot channel estimation capability associated with the connection request. For example, the UE 120 may use the at least one property to indicate that the UE 120 has the capability to aggregate DMRSs across repetitions of Msg3 (including the connection request) to enable the base station 110 to perform cross-slot channel estimation.

[0066] Additionally or alternatively, the at least one capability may include a repeat capability associated with multiple transmission configuration indicator (TCI) states for the connection request. For example, the UE 120 may use the at least one property to indicate that the UE 120 has the capability to repeat Msg3 (containing the connection request) using multiple TCI states. Thus, the UE 120 may indicate that the UE 120 has the capability to repeat the connection request using multiple beams (e.g., in different directions), where the multiple beams correspond to multiple TCI states.

[0067] Additionally or alternatively, the at least one capability may include a repetition type associated with the connection request. For example, UE 120 may use at least one property to indicate that UE 120 has the capability to repeat Msg3 (containing the connection request) according to repetition type A (e.g., as described with reference to FIG. 4A), according to repetition type B (e.g., as described with reference to FIG. 4B), and / or according to another repetition type.

[0068] Accordingly, UE 120 may vary its at least one property as described below to indicate at least one capability as described above. In some aspects, the at least one property associated with the random access preamble may include repetition of the random access preamble across multiple random access opportunities. For example, UE 120 may repeat the random access preamble across multiple random access opportunities to indicate that UE 120 has the ability to repeat Msg3, the ability to aggregate DMRS across repetitions of Msg3, the ability to repeat Msg3 using multiple TCIs, and / or the ability to repeat Msg3 according to repetition type A (e.g., as described with reference to FIG. 4A), according to repetition type B (e.g., as described with reference to FIG. 4B), and / or according to another repetition type. In some aspects, UE 120 may repeat the random access preamble across a certain amount of random access opportunities to indicate different capabilities. For example, UE 120 may repeat a random access preamble over two random access opportunities to indicate that UE 120 has the capability to repeat Msg3 according to repetition type A (e.g., as described with reference to FIG. 4A), or may repeat a random access preamble over four random access opportunities to indicate that UE 120 has the capability to repeat Msg3 according to repetition type B (e.g., as described with reference to FIG. 4B). In another example, UE 120 may repeat a random access preamble over three random access opportunities to indicate that UE 120 has the capability to repeat Msg3, or may repeat a random access preamble over five random access opportunities to indicate that UE 120 has the capability to aggregate DMRS over repetitions of Msg3 and / or the capability to repeat Msg3 using multiple TCIs.

[0069] Additionally or alternatively, the at least one property associated with the random access preamble may include a selection of one or more sequences used to generate the random access preamble. For example, the UE 120 may generate the random access preamble based at least in part on a Zaddoff-Chu sequence and a cyclic shift. Thus, the UE 120 may use different Zaddoff-Chu sequences and / or different cyclic shifts such that the random access preambles generated using the different Zaddoff-Chu sequences and / or different cyclic shifts indicate at least one capability of the UE 120 (e.g., indicate a request to repeat Msg3). For example, UE 120 may transmit a random access preamble generated using a first sequence and / or cyclic shift to indicate that UE 120 has the capability to repeat a connection request according to repetition type A (e.g., as described with respect to FIG. 4A ), and may transmit a random access preamble generated using a second sequence and / or cyclic shift to indicate that UE 120 has the capability to repeat a connection request according to repetition type B (e.g., as described with respect to FIG. 4B ). In another example, UE 120 may transmit a random access preamble generated using a first sequence and / or cyclic shift to indicate that UE 120 has the capability to repeat a connection request, and UE 120 may transmit a random access preamble generated using a second sequence and / or cyclic shift to indicate that UE 120 has the capability to aggregate DMRS across repetitions of the connection request and / or the capability to repeat a connection request using multiple TCIs.

[0070] Additionally or alternatively, the at least one property associated with the random access preamble may include selection of one or more random access occasions for transmitting the random access preamble. For example, UE 120 may transmit the random access preamble at one or more of the multiple random access opportunities indicated by base station 110. Thus, UE 120 may use the one or more different random access occasions such that the random access preamble transmitted at the one or more different occasions indicates at least one capability of UE 120 (e.g., indicates a request to repeat Msg3). For example, UE 120 may transmit the random access preamble at one or more first random access occasions to indicate that UE 120 has the capability to repeat Msg3 according to repetition type A (e.g., described with reference to FIG. 4A) and may transmit the random access preamble at one or more second random access occasions to indicate that UE 120 has the capability to repeat Msg3 according to repetition type B (e.g., described with reference to FIG. 4B). In another example, UE 120 may transmit a random access preamble at one or more first random access opportunities to indicate that UE 120 has the capability to repeat Msg3, and may transmit a random access preamble at one or more second random access opportunities to indicate that UE 120 has the capability to aggregate DMRS across repetitions of Msg3 and / or the capability to repeat Msg3 using multiple TCIs.

[0071] These properties may be combined by UE 120. For example, UE 120 may transmit a random access preamble generated using a particular sequence and / or cyclic shift to indicate that UE 120 has the capability to repeat Msg3, and may transmit such a random access preamble at one or more particular random access occasions to indicate that UE 120 has the capability to aggregate DMRS across repetitions of Msg3 and / or to repeat Msg3 using multiple TCIs. In another example, UE 120 may repeat a random access preamble to indicate that UE 120 has the ability to repeat Msg3, and may repeat the random access preamble over a first plurality of random access opportunities to indicate that UE 120 has the ability to repeat Msg3 according to repetition type A (e.g., as described with reference to FIG. 4A), but may repeat the random access preamble over a second plurality of random access opportunities to indicate that UE 120 has the ability to repeat Msg3 according to repetition type B (e.g., as described with reference to FIG. 4B).

[0072] Thus, based on the at least one property, base station 110 may determine whether to monitor for Msg3 repetition from UE 120. For example, the at least one property may correspond to a request for Msg3 repetition based on an association (e.g., in accordance with 3GPP® specifications and / or another standard) programmed (and / or otherwise preconfigured) into base station 110. As a result, base station 110 enables Msg3 repetition for UE 120 while conserving power and processing resources by not monitoring for Msg3 repetition from legacy UEs (and non-legacy UEs that do not request Msg3 repetition).

[0073] A random access response may be transmitted by base station 110 and received by UE 120 based at least in part on the random access preamble, as shown with reference to reference numeral 510. In some aspects, the random access response may include downlink control information (DCI) scheduling Msg2 (e.g., as described with reference to FIG. 3). Additionally or alternatively, the random access response may include Msg2 (e.g., as described with reference to FIG. 3) transmitted on a PDSCH.

[0074] Based at least in part on the random access preamble, Msg3 may be transmitted by UE 120 and received by base station 110, as indicated with reference to reference numeral 515. In some aspects, Msg3 may include an RRC connection request. Additionally or alternatively, UE 120 may transmit Msg3 on the PUSCH (e.g., as described with reference to FIG. 3).

[0075] In some aspects, repetitions of Msg3 across multiple resources may be transmitted by UE 120 and received by base station 110. For example, as shown with reference to reference numeral 520, at least one repetition of Msg3 may be transmitted by UE 120 and received by base station 110.

[0076] In some aspects, the UE 120 may transmit, and the base station 110 may receive, repetitions of Msg3 across multiple resources based at least in part on the random access preamble. For example, the UE 120 may transmit, and the base station 110 may receive, repetitions of Msg3 across multiple resources based at least in part on one or more rules stored in the UE 120 and / or the base station 110. The rules may be based at least in part on 3GPP specifications and / or another standard and may be programmed (and / or otherwise preconfigured) into the UE 120 and / or the base station 110. The rules may use a frequency domain resource allocation (FDRA), a time domain resource allocation (TDRA), and / or another resource indicator (e.g., used for the first transmission of the connection request) as input. The rules may further provide one or more additional FDRA, TDRA, and / or other resource indicators (e.g., used for one or more repetitions of the connection request) as output. Additionally or alternatively, UE 120 may have received, and base station 110 may have transmitted (e.g., in Msg2 described above), an indication of one or more parameters associated with Msg3. For example, the one or more parameters may include FDRA, TDRA, and / or another resource indicator (e.g., to be used for the first transmission of the connection request). Thus, UE 120 may transmit, and base station 110 may receive, repetitions of Msg3 across multiple resources based at least in part on applying one or more rules to the one or more parameters (e.g., to determine one or more additional FDRA, TDRA, and / or other resource indicators to be used for one or more repetitions of Msg3).

[0077] Alternatively, UE 120 may transmit, and base station 110 may receive, repetitions of Msg3 across multiple resources based at least in part on an instruction to repeat Msg3. For example, UE 120 may have received, and base station 110 may have transmitted, an instruction to repeat Msg3 (e.g., in Msg2 described above). The instruction may include a DCI associated with Msg2 (e.g., as described above), a field included in Msg2, and / or a flag (e.g., a single bit marked as “1” or TRUE) included in another data structure. In some aspects, UE 120 may transmit, and base station 110 may receive, repetitions of Msg3 across multiple resources based at least in part on one or more rules stored in UE 120 and / or base station 110. The rules may be based at least in part on a 3GPP specification and / or another standard and may be programmed (and / or otherwise pre-configured) into UE 120 and / or base station 110. The rule may use the FDRA, TDRA, and / or another resource indicator (e.g., to be used for the first transmission of the connection request) as input. The rule may further provide one or more additional FDRA, TDRA, and / or other resource indicators (e.g., to be used for one or more iterations of the connection request) as output. Additionally or alternatively, the instructions may include one or more parameters associated with Msg3, and the UE 120 may transmit, and the base station 110 may receive, repetitions of the connection request across multiple resources based at least in part on the one or more parameters. For example, the one or more parameters may include multiple FDRAs, multiple TDRAs, and / or other resource indicators to be used for repetitions of Msg3.

[0078] 5, UE 120 may use the random access preamble to implicitly indicate to base station 110 one or more capabilities associated with UE 120 (e.g., a request to repeat Msg3). For example, as described above, UE 120 may vary one or more properties associated with the random access preamble (e.g., one or more properties of the content and / or transmission of the random access preamble) to indicate one or more capabilities to base station 110. Thus, UE 120 may transmit repetitions of Msg3 to increase reliability by ensuring that base station 110 will monitor for those repetitions. Additionally, base station 110 will save network and processing resources by not monitoring for repetitions of Msg3 unless UE 120 has implicitly indicated one or more capabilities.

[0079] As noted above, Figure 5 is provided as an example. Other examples may differ from those described with respect to Figure 5.

[0080] 6 illustrates an example process 600 performed, for example, by a UE, in accordance with the present disclosure. Example process 600 is an example in which a UE (e.g., UE 120 and / or apparatus 800 of FIG. 8) performs operations associated with indicating UE capabilities using a random access preamble.

[0081] 6, in some aspects, process 600 may include transmitting a PRACH preamble (block 610) to a base station (e.g., base station 110 and / or apparatus 900 of FIG. 9). For example, a UE (e.g., using transmitting component 804 shown in FIG. 8) may transmit the PRACH preamble to the base station as described herein. In some aspects, at least one property associated with the PRACH preamble corresponds to a request for repetition of Msg3.

[0082] 6, in some aspects, process 600 may include transmitting, to the base station, two or more repetitions of Msg3 based at least in part on the PRACH preamble (block 620). For example, the UE (e.g., using the transmitting component 804) may transmit, to the base station, two or more repetitions of Msg3 based at least in part on the PRACH preamble, as described herein.

[0083] Process 600 may include additional aspects, such as any single aspect or any combination of aspects described below and / or with respect to one or more other processes described elsewhere herein.

[0084] In a first aspect, Msg3 includes an RRC connection request, which results in reduced latency for the UE 120 in establishing an RRC connection with the base station 110.

[0085] In a second aspect, alone or in combination with the first aspect, Msg3 is transmitted on the PUSCH.

[0086] In a third aspect, alone or in combination with one or more of the first and second aspects, the request further indicates a cross-slot channel estimation capability associated with Msg3, a repetition capability associated with multiple transmission configuration indicators for Msg3, a repetition type associated with Msg3, or a combination thereof. As a result, UE 120 can increase the reliability of Msg3 by using cross-slot channel estimation, using repetition across multiple TCI states, and / or selecting repetition type A or repetition type B for Msg3.

[0087] In a fourth aspect, alone or in combination with one or more of the first through third aspects, the at least one property associated with the PRACH preamble includes a selection of one or more sequences used to generate the PRACH preamble, a selection of one or more PRACH opportunities for transmitting the PRACH preamble, or a combination thereof. As a result, the base station 110 can determine whether to monitor for Msg3 repetitions based on the at least one property.

[0088] In a fifth aspect, alone or in combination with one or more of the first through fourth aspects, transmitting two or more repetitions of Msg3 includes transmitting two or more repetitions across multiple resources, such that base station 110 can decode Msg3 using soft combining.

[0089] In a sixth aspect, alone or in combination with one or more of the first through fifth aspects, transmitting two or more repetitions across multiple resources is based at least in part on one or more rules stored in the UE.

[0090] In a seventh aspect, alone or in combination with one or more of the first through sixth aspects, the process 600 further includes receiving from the base station (e.g., using the receiving component 802 shown in FIG. 8 ) an indication of the amount of repetition associated with Msg3. As a result, the base station 110 conserves power and processing resources by monitoring for only the indicated amount of repetition of Msg3.

[0091] In an eighth aspect, alone or in combination with one or more of the first through seventh aspects, the process 600 further includes receiving (e.g., using the receiving component 802) an indication from the base station such that two or more repetitions of Msg3 are to be transmitted based at least in part on the indication to repeat Msg3. As a result, the UE 120 saves power and processing resources by only transmitting a repetition of Msg3 when the base station 110 indicates that the base station 110 will monitor for the repetition.

[0092] In a ninth aspect, alone or in combination with one or more of the first to eighth aspects, the indication is included in Msg2 received on the PDSCH.

[0093] In a tenth aspect, alone or in combination with one or more of the first through ninth aspects, two or more repetitions of Msg3 are transmitted based at least in part on one or more rules stored in the UE.

[0094] In an eleventh aspect, alone or in combination with one or more of the first through tenth aspects, the process 600 further includes receiving, from the base station (e.g., using the receiving component 802), one or more parameters associated with Msg3, such that two or more repetitions of Msg3 are transmitted based at least in part on the one or more parameters. As a result, the UE 120 experiences increased quality and reliability or reduced latency when transmitting the repetitions of Msg3 in response to the one or more parameters.

[0095] In a twelfth aspect, alone or in combination with one or more of the first to eleventh aspects, the indication is included in at least one of Msg2 received on the PDSCH or DCI received on the PDCCH.

[0096] 6 illustrates example blocks of process 600, in some aspects process 600 may include additional, fewer, different, or differently arranged blocks compared to the blocks illustrated in FIG 6. Additionally or alternatively, two or more of the blocks of process 600 may be performed in parallel.

[0097] 7 illustrates an example process 700 performed, for example, by a base station, in accordance with the present disclosure. Example process 700 is an example in which a base station (e.g., base station 110 and / or apparatus 900 of FIG. 9) performs operations associated with indicating UE capabilities using a random access preamble.

[0098] 7, in some aspects, process 700 may include receiving a PRACH preamble from a UE (e.g., UE 120 and / or apparatus 800 of FIG. 8) (block 710). For example, a base station (e.g., using receiving component 902 shown in FIG. 9) may receive the PRACH preamble from the UE as described herein. In some aspects, at least one property associated with the PRACH preamble corresponds to a request for Msg3 repetition.

[0099] 7, in some aspects, process 700 may include receiving, from the UE, two or more repetitions of Msg3 based at least in part on the PRACH preamble (block 720). For example, a base station (e.g., using receiving component 902) may receive, from the UE, two or more repetitions of Msg3 based at least in part on the PRACH preamble, as described herein.

[0100] Process 700 may include additional aspects, such as any single aspect or any combination of aspects described below and / or with respect to one or more other processes described elsewhere herein.

[0101] In a first aspect, Msg3 includes an RRC connection request, resulting in reduced latency for base station 110 in establishing an RRC connection with UE 120.

[0102] In a second aspect, alone or in combination with the first aspect, Msg3 is received on the PUSCH.

[0103] In a third aspect, alone or in combination with one or more of the first and second aspects, the request further indicates a cross-slot channel estimation capability associated with Msg3, a repetition capability associated with multiple transmission configuration indicators for Msg3, a repetition type associated with Msg3, or a combination thereof. As a result, UE 120 can increase the reliability of Msg3 by using cross-slot channel estimation, using repetition across multiple TCI states, and / or selecting repetition type A or repetition type B for Msg3.

[0104] In a fourth aspect, alone or in combination with one or more of the first through third aspects, the at least one property associated with the PRACH preamble includes a selection of one or more sequences on which the PRACH preamble is based, a selection of one or more PRACH occasions on which the PRACH preamble is received, or a combination thereof. As a result, the base station 110 can determine whether to monitor for Msg3 repetitions based on the at least one property.

[0105] In a fifth aspect, alone or in combination with one or more of the first through fourth aspects, receiving two or more repetitions of Msg3 includes receiving two or more repetitions across multiple resources, such that base station 110 can decode Msg3 using soft combining.

[0106] In a sixth aspect, alone or in combination with one or more of the first through fifth aspects, receiving two or more repetitions across multiple resources is based at least in part on one or more rules stored in the UE.

[0107] In a seventh aspect, alone or in combination with one or more of the first through sixth aspects, the process 700 further includes transmitting to the UE (e.g., using the transmitting component 904 shown in FIG. 9 ) an indication of the amount of repetition associated with Msg3. As a result, the base station 110 saves power and processing resources by monitoring for only the indicated amount of repetition of Msg3.

[0108] In an eighth aspect, alone or in combination with one or more of the first through seventh aspects, the process 700 further includes transmitting (e.g., using the transmitting component 904) an indication to the UE such that two or more repetitions of Msg3 are received based at least in part on the indication to repeat Msg3. As a result, the UE 120 saves power and processing resources by only transmitting repetitions of Msg3 when the base station 110 indicates that the base station 110 will monitor for repetitions.

[0109] In a ninth aspect, alone or in combination with one or more of the first to eighth aspects, the indication is included in Msg2 transmitted on the PDSCH.

[0110] In a tenth aspect, alone or in combination with one or more of the first through ninth aspects, two or more repetitions of Msg3 are received based at least in part on one or more rules stored in the base station.

[0111] In an eleventh aspect, alone or in combination with one or more of the first through tenth aspects, the process 700 further includes transmitting, to the UE (e.g., using the transmitting component 904), one or more parameters associated with Msg3 such that two or more repetitions of Msg3 are received based at least in part on the one or more parameters. As a result, the base station 110 can increase the quality and reliability of the repetitions of Msg3 or reduce the latency associated with the repetitions of Msg3 depending on the one or more parameters.

[0112] In a twelfth aspect, alone or in combination with one or more of the first to eleventh aspects, the indication is included in at least one of Msg2 transmitted on the PDSCH or DCI transmitted on the PDCCH.

[0113] 7 illustrates example blocks of process 700, in some aspects process 700 may include additional, fewer, different, or differently arranged blocks compared to the blocks illustrated in FIG 7. Additionally or alternatively, two or more of the blocks of process 700 may be performed in parallel.

[0114] 8 is a block diagram of an example apparatus 800 for wireless communication. The apparatus 800 may be a UE, or a UE may include the apparatus 800. In some aspects, the apparatus 800 includes a receiving component 802 and a transmitting component 804, which may be in communication with each other (e.g., via one or more buses and / or one or more other components). As shown, the apparatus 800 may communicate with another apparatus 806 (such as a UE, a base station, or another wireless communication device) using the receiving component 802 and the transmitting component 804. As further shown, the apparatus 800 may include an encoding component 808, among other examples.

[0115] In some aspects, apparatus 800 may be configured to perform one or more operations described herein with respect to FIG. 5. Additionally or alternatively, apparatus 800 may be configured to perform one or more processes described herein, such as process 600 of FIG. 6, or a combination thereof. In some aspects, apparatus 800 and / or one or more components shown in FIG. 8 may include one or more components of a UE described above with respect to FIG. 2. Additionally or alternatively, one or more components shown in FIG. 8 may be implemented within one or more components described above with respect to FIG. 2. Additionally or alternatively, one or more components of the set of components may be implemented at least in part as software stored in memory. For example, a component (or a portion of a component) may be implemented as instructions or code stored on a non-transitory computer-readable medium and executable by a controller or processor to perform the function or operation of the component.

[0116] The receiving component 802 may receive communications such as reference signals, control information, data communications, or combinations thereof from the device 806. The receiving component 802 may provide the received communications to one or more other components of the device 800. In some aspects, the receiving component 802 may perform signal processing (such as filtering, amplification, demodulation, analog-to-digital conversion, demultiplexing, deinterleaving, demapping, equalization, interference cancellation, or decoding, among other examples) on the received communications and may provide the processed signals to one or more other components of the device 800. In some aspects, the receiving component 802 may include one or more antennas, a demodulator, a MIMO detector, a receive processor, a controller / processor, a memory, or a combination thereof of a UE as described above with respect to FIG.

[0117] The transmitting component 804 may transmit a communication to the device 806, such as a reference signal, control information, a data communication, or a combination thereof. In some aspects, one or more other components of the device 800 may generate a communication and provide the generated communication to the transmitting component 804 for transmission to the device 806. In some aspects, the transmitting component 804 may perform signal processing (such as filtering, amplification, modulation, digital-to-analog conversion, multiplexing, interleaving, mapping, or encoding, among other examples) on the generated communication and may transmit the processed signal to the device 806. In some aspects, the transmitting component 804 may include one or more antennas, a modulator, a transmit MIMO processor, a transmit processor, a controller / processor, a memory, or a combination thereof, of a UE as described above with respect to FIG. 2. In some aspects, the transmitting component 804 may be co-located with the receiving component 802 in a transceiver.

[0118] In some aspects, the transmitting component 804 may transmit a PRACH preamble to the apparatus 806, where at least one property associated with the PRACH preamble may correspond to a request for Msg3 repetitions from the apparatus 800. For example, the encoding component 808 may select one or more sequences for generating a PRACH preamble to indicate the request. In some aspects, the encoding component 808 may include a modulator, a transmit MIMO processor, a transmit processor, a controller / processor, a memory, or a combination thereof of a UE, as described above with respect to FIG. 2. Additionally or alternatively, the transmitting component 804 may select one or more PRACH opportunities for transmitting the PRACH preamble to indicate the request. Thus, the transmitting component 804 may transmit two or more repetitions of Msg3 to the base station based at least in part on the PRACH preamble.

[0119] In some aspects, the receiving component 802 may receive from the device 806 an indication of one or more parameters associated with Msg3. Accordingly, the transmitting component 804 may transmit two or more repetitions of Msg3 based at least in part on the one or more parameters. Additionally or alternatively, the receiving component 802 may receive from the device 806 an indication to repeat the connection request. Accordingly, the transmitting component 804 may transmit two or more repetitions of Msg3 based at least in part on the indication. For example, the receiving component 802 may receive from the device 806 an indication of the amount of repetitions associated with Msg3.

[0120] The number and arrangement of components shown in Figure 8 are provided as an example. In practice, there may be additional, fewer, different, or differently arranged components compared to those shown in Figure 8. Furthermore, two or more components shown in Figure 8 may be implemented within a single component, or a single component shown in Figure 8 may be implemented as multiple distributed components. Additionally or alternatively, a set of components shown in Figure 8 may perform one or more functions described as being performed by another set of components shown in Figure 8.

[0121] 9 is a block diagram of an example apparatus 900 for wireless communication. The apparatus 900 may be a base station, or a base station may include the apparatus 900. In some aspects, the apparatus 900 includes a receiving component 902 and a transmitting component 904, which may be in communication with each other (e.g., via one or more buses and / or one or more other components). As shown, the apparatus 900 may communicate with another apparatus 906 (such as a UE, a base station, or another wireless communication device) using the receiving component 902 and the transmitting component 904. As further shown, the apparatus 900 may include a decoding component 908, among other examples.

[0122] In some aspects, apparatus 900 may be configured to perform one or more operations described herein with respect to FIG. 5. Additionally or alternatively, apparatus 900 may be configured to perform one or more processes described herein, such as process 700 of FIG. 7, or a combination thereof. In some aspects, apparatus 900 and / or one or more components shown in FIG. 9 may include one or more components of the base station described above with respect to FIG. 2. Additionally or alternatively, one or more components shown in FIG. 9 may be implemented within one or more components described above with respect to FIG. 2. Additionally or alternatively, one or more components of the set of components may be implemented at least in part as software stored in memory. For example, a component (or a portion of a component) may be implemented as instructions or code stored on a non-transitory computer-readable medium and executable by a controller or processor to perform the function or operation of the component.

[0123] The receiving component 902 may receive communications such as reference signals, control information, data communications, or combinations thereof from the device 906. The receiving component 902 may provide the received communications to one or more other components of the device 900. In some aspects, the receiving component 902 may perform signal processing (such as filtering, amplification, demodulation, analog-to-digital conversion, demultiplexing, deinterleaving, demapping, equalization, interference cancellation, or decoding, among other examples) on the received communications and may provide the processed signals to one or more other components of the device 900. In some aspects, the receiving component 902 may include one or more antennas, a demodulator, a MIMO detector, a receive processor, a controller / processor, a memory, or a combination thereof of the base station described above with respect to FIG.

[0124] The transmitting component 904 may transmit a communication to the device 906, such as a reference signal, control information, a data communication, or a combination thereof. In some aspects, one or more other components of the device 900 may generate a communication and provide the generated communication to the transmitting component 904 for transmission to the device 906. In some aspects, the transmitting component 904 may perform signal processing (such as filtering, amplification, modulation, digital-to-analog conversion, multiplexing, interleaving, mapping, or encoding, among other examples) on the generated communication and may transmit the processed signal to the device 906. In some aspects, the transmitting component 904 may include one or more antennas, a modulator, a transmit MIMO processor, a transmit processor, a controller / processor, a memory, or a combination thereof, of a base station described above with respect to FIG. 2. In some aspects, the transmitting component 904 may be co-located with the receiving component 902 in a transceiver.

[0125] In some aspects, the receiving component 902 may receive a PRACH preamble from the device 906, where at least one property associated with the PRACH preamble may correspond to a request for a repetition of Msg3 from the device 906. For example, the decoding component 908 may decode one or more sequences based at least in part on the PRACH preamble, where the decoded sequence may indicate a request. In some aspects, the decoding component 908 may include a demodulator, a MIMO detector, a receive processor, a controller / processor, a memory, or a combination thereof, of a base station described above with respect to FIG. 2. Additionally or alternatively, the receiving component 902 may receive a PRACH preamble in one or more PRACH opportunities, where the one or more PRACH opportunities may indicate a request. Thus, the receiving component 902 may receive two or more repetitions of Msg3 from the device 906 based at least in part on the random access preamble.

[0126] In some aspects, the transmitting component 904 may transmit to the device 906 an indication of one or more parameters associated with Msg3. Thus, the receiving component 902 may receive two or more repetitions of Msg3 based at least in part on the one or more parameters. Additionally or alternatively, the transmitting component 904 may transmit to the device 906 an indication to repeat Msg3. Thus, the receiving component 902 may receive two or more repetitions of Msg3 based at least in part on the indication. For example, the transmitting component 904 may transmit to the device 906 an indication of the amount of repetitions associated with Msg3.

[0127] The number and arrangement of components shown in Figure 9 are provided as an example. In practice, there may be additional, fewer, different, or differently arranged components compared to those shown in Figure 9. Furthermore, two or more components shown in Figure 9 may be implemented within a single component, or a single component shown in Figure 9 may be implemented as multiple distributed components. Additionally or alternatively, a set of components shown in Figure 9 may perform one or more functions described as being performed by another set of components shown in Figure 9.

[0128] The following provides a summary of some aspects of the disclosure.

[0129] Aspect 1: A method of wireless communications performed by a user equipment (UE), the method including: transmitting, to a base station, a physical random access channel (PRACH) preamble, wherein at least one property associated with the PRACH preamble corresponds to a request for Msg3 repetition; and transmitting, to the base station, two or more repetitions of Msg3 based at least in part on the random access preamble.

[0130] Aspect 2: The method of aspect 1, wherein Msg3 includes a radio resource control (RRC) connection request.

[0131] Example 3: The method of any one of Examples 1 to 2, wherein Msg3 is transmitted on a physical uplink shared channel (PUSCH).

[0132] Aspect 4: The method of any of aspects 1 to 3, wherein the request further indicates a cross-slot channel estimation capability associated with Msg3, a repetition capability associated with multiple transmission configuration indicators for Msg3, a repetition type associated with Msg3, or a combination thereof.

[0133] Aspect 5: The method of any of aspects 1-4, wherein the at least one property associated with the PRACH preamble includes a selection of one or more sequences used to generate the PRACH preamble, a selection of one or more PRACH opportunities for transmitting the PRACH preamble, or a combination thereof.

[0134] Aspect 6: The method of any of aspects 1 to 5, wherein transmitting two or more repetitions of Msg3 includes transmitting two or more repetitions across multiple resources.

[0135] Aspect 7: The method of aspect 6, wherein the step of transmitting the two or more repetitions across the plurality of resources is based at least in part on one or more rules stored in the UE.

[0136] Aspect 8: The method of any of aspects 1-7, further comprising receiving, from a base station, an indication of an amount of repetition associated with Msg3.

[0137] Aspect 9: The method of aspect 8, wherein the indication is included in a Msg2 received on a physical downlink shared channel (PDSCH).

[0138] Aspect 10: The method of any of Aspects 1-9, further comprising receiving, from a base station, an indication to repeat Msg3, wherein two or more repetitions of Msg3 are transmitted based at least in part on the indication.

[0139] Aspect 11: The method of aspect 10, wherein the indication is included in a Msg2 received on a physical downlink shared channel (PDSCH).

[0140] Embodiment 12: The method of any of embodiments 1-11, wherein two or more iterations of Msg3 are sent based at least in part on one or more rules stored in the UE.

[0141] Aspect 13: The method of any of Aspects 1-12, further comprising receiving, from a base station, an indication of one or more parameters associated with Msg3, wherein two or more iterations of Msg3 are transmitted based at least in part on the one or more parameters.

[0142] Aspect 14: The method of aspect 13, wherein the indication is included in at least one of Msg2 received on a physical downlink shared channel (PDSCH) or downlink control information (DCI) received on a physical downlink control channel (PDCCH).

[0143] Aspect 15: A method of wireless communications performed by a base station, the method including: receiving a physical random access channel (PRACH) preamble from a user equipment (UE), wherein at least one property associated with the PRACH preamble corresponds to a request for Msg3 repetition; and receiving from the UE two or more repetitions of Msg3 based at least in part on the random access preamble.

[0144] Example 16: The method of example 15, wherein Msg3 includes a radio resource control (RRC) connection request.

[0145] Example 17: The method of any of Examples 15-16, wherein Msg3 is received on a physical uplink shared channel (PUSCH).

[0146] Aspect 18: The method of any of aspects 15-17, wherein the request further indicates a cross-slot channel estimation capability associated with Msg3, a repetition capability associated with the multiple transmission configuration indicators for Msg3, a repetition type associated with Msg3, or a combination thereof.

[0147] Embodiment 19: The method of any of embodiments 15-18, wherein the at least one property associated with the PRACH preamble includes a selection of one or more sequences on which the PRACH preamble is based, a selection of one or more PRACH occasions on which the PRACH preamble is received, or a combination thereof.

[0148] Aspect 20: The method of any of aspects 15 to 19, wherein receiving two or more repetitions of Msg3 includes receiving two or more repetitions across multiple resources.

[0149] Aspect 21: The method of aspect 20, wherein receiving two or more repetitions across a plurality of resources is based at least in part on one or more rules stored in the base station.

[0150] Aspect 22: The method of any of aspects 15-21, further comprising transmitting, to the UE, an indication of the amount of repetition associated with Msg3.

[0151]

[0071] Aspect 23: The method of aspect 22, wherein the indication is included in a Msg2 transmitted on a physical downlink shared channel (PDSCH).

[0152] Aspect 24: The method of any of aspects 15-23, further comprising sending an indication to the UE to repeat Msg3, wherein two or more repetitions of Msg3 are received based at least in part on the indication.

[0153]

[0071] Aspect 25: The method of aspect 24, wherein the indication is included in a Msg2 transmitted on a physical downlink shared channel (PDSCH).

[0154] Embodiment 26: The method of any of embodiments 15-25, wherein two or more iterations of Msg3 are received based at least in part on one or more rules stored in the base station.

[0155] Aspect 27: The method of any of aspects 15-26, further comprising transmitting, to the UE, an indication of one or more parameters associated with Msg3, wherein two or more iterations of Msg3 are received based at least in part on the one or more parameters.

[0156] Aspect 28: The method of aspect 27, wherein the indication is included in at least one of Msg2 transmitted on a physical downlink shared channel (PDSCH) or downlink control information (DCI) transmitted on a physical downlink control channel (PDCCH).

[0157] Aspect 29: An apparatus for wireless communication in a device, the apparatus comprising: a processor; a memory coupled to the processor; and instructions stored in the memory and executable by the processor to cause the apparatus to perform one or more methods of aspects 1-14.

[0158] Aspect 30: A device for wireless communication, comprising: a memory; and one or more processors coupled to the memory, the one or more processors configured to perform one or more methods of aspects 1-14.

[0159] Aspect 31: An apparatus for wireless communication, the apparatus comprising at least one means for performing one or more of the methods of aspects 1-14.

[0160] Aspect 32: A non-transitory computer-readable medium storing code for wireless communication, the code including instructions executable by a processor to perform one or more of the methods of aspects 1-14.

[0161] Aspect 33: A non-transitory computer-readable medium storing a set of instructions for wireless communication, the set of instructions including one or more instructions that, when executed by one or more processors of a device, cause the device to perform one or more methods of aspects 1-14.

[0162] Aspect 34: An apparatus for wireless communication in a device, the apparatus comprising: a processor; a memory coupled to the processor; and instructions stored in the memory and executable by the processor to cause the apparatus to perform one or more methods of aspects 15-28.

[0163] Aspect 35: A device for wireless communication, comprising: a memory; and one or more processors coupled to the memory, the one or more processors configured to perform one or more methods of aspects 15-28.

[0164] Aspect 36: An apparatus for wireless communication, comprising at least one means for performing one or more of the methods of aspects 15-28.

[0165] Aspect 37: A non-transitory computer-readable medium storing code for wireless communication, the code including instructions executable by a processor to perform one or more of the methods of aspects 15-28.

[0166] Aspect 38: A non-transitory computer-readable medium storing a set of instructions for wireless communication, the set of instructions including one or more instructions that, when executed by one or more processors of a device, cause the device to perform one or more methods of aspects 15-28.

[0167] The above disclosure provides illustration and description, but is not intended to be exhaustive or to limit the embodiments to the precise form disclosed. Modifications and variations may be made in light of the above disclosure or may be acquired from practice of the embodiments.

[0168] The term "component" as used herein shall be broadly construed as hardware and / or combinations of hardware and software. "Software" shall be broadly construed to mean, among other examples, instructions, instruction sets, code, code segments, program code, programs, subprograms, software modules, applications, software applications, software packages, routines, subroutines, objects, executable files, threads of execution, procedures, and / or functions, whether referred to as software, firmware, middleware, microcode, hardware description language, or otherwise. A "processor," as used herein, is implemented in hardware and / or a combination of hardware and software. It will be apparent that the systems and / or methods described herein may be implemented in different forms of hardware and / or combinations of hardware and software. The actual dedicated control hardware or software code used to implement these systems and / or methods is not intended to be limiting. Accordingly, the operation and behavior of the systems and / or methods will be described herein without reference to specific software code, as those skilled in the art will understand that software and hardware may be designed to implement the systems and / or methods based, at least in part, on the description herein.

[0169] As used herein, "meeting a threshold" can refer to a value being greater than the threshold, greater than or equal to the threshold, less than the threshold, less than or equal to the threshold, equal to the threshold, not equal to the threshold, etc., depending on the context.

[0170] Although particular combinations of features are recited in the claims and / or disclosed herein, these combinations do not limit the disclosure of various aspects. Many of these features may be combined in ways not specifically recited in the claims and / or disclosed herein. The disclosure of various aspects includes each dependent claim in combination with every other claim in the claim set. As used herein, a phrase referring to "at least one of" a list of items refers to any combination of those items, including single members. As an example, "at least one of a, b, or c" is intended to cover a, b, c, a+b, a+c, b+c, and a+b+c, as well as any combination having multiple identical elements (e.g., a+a, a+a+a, a+a+b, a+a+c, a+b+b, a+c+c, b+b, b+b+b, b+b+c, c+c, and c+c+c, or any other order of a, b, and c).

[0171] No element, act, or instruction used herein should be construed as critical or required unless explicitly described as such. Also, as used herein, the articles "a" and "an" are intended to include one or more items and may be used interchangeably with "one or more." Furthermore, as used herein, the article "the" is intended to include one or more items referred to in conjunction with the article "the" and may be used interchangeably with "one or more." Furthermore, as used herein, the terms "set" and "group" are intended to include one or more items and may be used interchangeably with "one or more." Where only one item is intended, the phrase "only one" or similar language is used. Also, as used herein, terms such as "has," "have," and "having" are intended to be open-ended terms that do not limit the elements they modify (e.g., an element that "has" A may also have B). Furthermore, the phrase "based on" is intended to mean "based at least in part on," unless expressly specified otherwise. Also, as used herein, the term "or" is intended to be inclusive when used consecutively and may be used interchangeably with "and / or" unless otherwise specified (e.g., when used in combination with "either" or "only one of"). [Explanation of symbols]

[0172] 100 Wireless Networks 102a Macrocell 102b Picocell 102c Femtocell 110 base station 110a BS 110b BS 110c BS 110d BS 120 UE 120a UE 120b UE 120c UE 120d UE 120e UE 130 Network Controller 200 examples 212 Data Sources 220 Transmit Processor 230 Transmit (TX) Multiple Input Multiple Output (MIMO) Processor, TX MIMO Processor 232, 232a~232t modems 234, 234a~234t antennas 236 MIMO detector 238 Receive Processor 239 Data Sink 240 Controllers / Processors 242 memory 244 communication unit 246 Scheduler 252, 252a~252r antennas 254, 254a~254r modems 256 MIMO detector 258 Receive Processor 260 Data Sink 262 Data Sources 264 Transmit Processor 266 TX MIMO Processor 280 Controller / Processor 282 memory 284 Housing 290 Controller / Processor 292 memory 294 Communication Unit 400 examples 401 Send 403 Send 450 examples 451 Send 453 Send 500 examples 600 processes 700 processes 800 equipment 802 Receiving Component 804 Transmission Components 806 equipment 808 Coding Component 900 equipment 902 Receiving Component 904 Transmission Components 906 Equipment 908 Decryption Component

Claims

1. 1. An apparatus for wireless communication in a user equipment (UE), comprising: Memory and one or more processors coupled to the memory; wherein the one or more processors: transmitting, to a base station, a physical random access channel (PRACH) preamble, wherein at least one property associated with the PRACH preamble corresponds to a request for Msg3 repetition, the request indicating a cross-slot channel estimation capability associated with Msg3 and a repetition capability associated with a plurality of transmission configuration indicators for Msg3; transmitting to the base station two or more repetitions of the Msg3 based on the PRACH preamble; An apparatus configured to:

2. The apparatus of claim 1 , wherein the Msg3 comprises a radio resource control (RRC) connection request.

3. The device of claim 1, wherein Msg3 is transmitted on a physical uplink shared channel (PUSCH).

4. The apparatus of claim 1, wherein the request further indicates a repetition type associated with Msg3.

5. The at least one property associated with the PRACH preamble: selecting one or more sequences to be used to generate the PRACH preamble; selecting one or more PRACH opportunities for transmitting said PRACH preamble; or combinations of these The apparatus of claim 1 , comprising:

6. 2. The apparatus of claim 1, wherein transmitting the two or more repetitions of the Msg3 comprises transmitting the two or more repetitions across multiple resources.

7. 7. The apparatus of claim 6, wherein transmitting the two or more repetitions across the plurality of resources is based on one or more rules stored in the UE.

8. the one or more processors: and further configured to receive from the base station an indication of an amount of repetition associated with the Msg3.

10. The apparatus of claim 1.

9. 10. The apparatus of claim 8, wherein the indication is included in a Msg2 received on a physical downlink shared channel (PDSCH).

10. the one or more processors: further configured to receive an indication from the base station to repeat the Msg3; the two or more repetitions of the Msg3 are sent based on the instruction, or the two or more repetitions of Msg3 are transmitted based on one or more rules stored in the UE; or the one or more processors: further configured to receive from the base station an indication of one or more parameters associated with the Msg3; the two or more iterations of the Msg3 are sent based on the one or more parameters.

10. The apparatus of claim 1.

11. 1. An apparatus for wireless communication at a base station, comprising: Memory and one or more processors coupled to the memory; wherein the one or more processors: receiving, from a user equipment (UE), a physical random access channel (PRACH) preamble, wherein at least one property associated with the PRACH preamble corresponds to a request for Msg3 repetition, the request indicating a cross-slot channel estimation capability associated with Msg3 and a repetition capability associated with a plurality of transmission configuration indicators for Msg3; receiving from the UE two or more repetitions of the Msg3 based on the PRACH preamble; An apparatus configured to:

12. 12. The apparatus of claim 11, wherein the Msg3 comprises a radio resource control (RRC) connection request.

13. The device of claim 11, wherein the Msg3 is received on a physical uplink shared channel (PUSCH).

14. The apparatus of claim 11, wherein the request further indicates a recurrence type associated with Msg3.

15. The at least one property associated with the PRACH preamble: selecting one or more sequences on which the PRACH preamble is based; selection of one or more PRACH occasions on which the PRACH preamble is to be received; or combinations of these 12. The apparatus of claim 11, comprising:

16. 12. The apparatus of claim 11, wherein receiving the two or more repetitions of the Msg3 comprises receiving the two or more repetitions across multiple resources.

17. 17. The apparatus of claim 16, wherein receiving the two or more repetitions across the plurality of resources is based on one or more rules stored in the base station.

18. the one or more processors: further configured to send to the UE an indication of the amount of repetition associated with the Msg3; or the one or more processors: further configured to send to the UE an instruction to repeat the Msg3; the two or more repetitions of the Msg3 are received based on the instruction, or the two or more iterations of Msg3 are received based on one or more rules stored in the base station; or the one or more processors: further configured to send to the UE an indication of one or more parameters associated with the Msg3; the two or more iterations of the Msg3 are received based on the one or more parameters.

12. The apparatus of claim 11.

19. 1. A method of wireless communication performed by a user equipment (UE), comprising: transmitting, to a base station, a physical random access channel (PRACH) preamble, wherein at least one property associated with the PRACH preamble corresponds to a request for Msg3 repetition, the request indicating a cross-slot channel estimation capability associated with Msg3 and a repetition capability associated with a plurality of transmission configuration indicators for Msg3; transmitting, to the base station, two or more repetitions of the Msg3 based on the PRACH preamble; A method comprising:

20. 1. A method of wireless communication performed by a base station, comprising: receiving a physical random access channel (PRACH) preamble from a user equipment (UE), wherein at least one property associated with the PRACH preamble corresponds to a request for Msg3 repetition, the request indicating a cross-slot channel estimation capability associated with Msg3 and a repetition capability associated with a plurality of transmission configuration indicators for Msg3; receiving from the UE two or more repetitions of the Msg3 based on the PRACH preamble; A method comprising:

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