Repetition of message 3 communication of four-step random access channel procedure

Abstract

Various aspects of the disclosure generally relate to wireless communication. In some aspects, a user equipment (UE) can determine a number of repetitions of a message 3 (msg3) communication of a four-step random access channel (RACH) procedure to transmit to a base station. The UE can transmit the repetitions of the msg3 communication to the base station based at least in part on determining the number of repetitions of the msg3 communication. Numerous other aspects are provided.

Description

[0001] Cross-reference to related applications

[0002] This patent application claims priority to U.S. Provisional Patent Application No. 63 / 045,560, filed June 29, 2020, entitled “REPETITION OF A MESSAGE 3 COMMUNICATION OF A FOUR-STEP RANDOM ACCESS CHANNEL PROCEDURE,” and U.S. Non-Provisional Patent Application No. 17 / 302,771, filed May 12, 2021, entitled “REPETITION OF A MESSAGE 3 COMMUNICATION OF A FOUR-STEP RANDOM ACCESS CHANNEL PROCEDURE,” which are expressly incorporated herein by reference. Technical Field

[0003] In summary, various aspects of this disclosure relate to wireless communication and to repetitive techniques and apparatus for message 3 (msg3) communication in a four-step random access channel (RACH) procedure. Background Technology

[0004] Wireless communication systems are widely deployed to provide a variety of telecommunications services such as telephone, video, data, messaging, and broadcasting. Typical wireless communication systems employ multiple access technologies that enable communication with multiple users by sharing available system resources (e.g., bandwidth, transmit power, etc.). Examples of such multiple access technologies include Code Division Multiple Access (CDMA) systems, Time Division Multiple Access (TDMA) systems, Frequency Division Multiple Access (FDMA) systems, Orthogonal Frequency Division Multiple Access (OFDMA) systems, Single Carrier Frequency Division Multiple Access (SC-FDMA) systems, Time Division Synchronous Code Division Multiple Access (TD-SCDMA) systems, and Long Term Evolution (LTE). LTE / Improved LTE is an enhanced set of the Universal Mobile Telecommunications System (UMTS) mobile standard released by the 3rd Generation Partnership Project (3GPP).

[0005] A wireless network may include multiple base stations (BSs) capable of supporting communication for multiple user equipments (UEs). UEs can communicate with the BS via downlinks and uplinks. A "downlink" (or "forward link") refers to the communication link from the BS to the UE, while an "uplink" (or "backlink") refers to the communication link from the UE to the BS. As will be described in more detail herein, a BS may be referred to as a Node B, gNB, Access Point (AP), Radio Headend, Transmit / Receive Point (TRP), New Radio (NR) BS, 5G Node B, etc.

[0006] The above multiple access technologies have been adopted in various telecommunications standards to provide a common protocol that enables different user equipment to communicate at the city, country, region, and even global levels. NR (which can also be referred to as 5G) is an enhancement set of the LTE mobile standard released by 3GPP. NR is designed to better integrate with other open standards by improving spectrum efficiency, reducing costs, improving service, utilizing new spectrum, and using Orthogonal Frequency Division Multiplexing (OFDM) with Cyclic Prefix (CP) on the downlink (DL) and CP-OFDM and / or SC-FDM (e.g., also known as Discrete Fourier Transform Spread Spectrum OFDM (DFT-s-OFDM)) on the uplink (UL), thereby better supporting mobile broadband internet access, as well as beamforming, multiple-input multiple-output (MIMO) antenna technologies, and carrier aggregation. As the demand for mobile broadband access continues to grow, further improvements to LTE, NR, and other wireless access technologies remain useful. Summary of the Invention

[0007] In some aspects, a method of wireless communication performed by a user equipment (UE) includes: determining the number of repetitions of a message 3 (msg3) communication to be transmitted to a base station in a four-step random access channel (RACH) procedure; and transmitting the repetitions of the msg3 communication to the base station based at least in part on the determination of the number of repetitions of the msg3 communication.

[0008] In some aspects, a method of wireless communication performed by a base station includes: sending a message 2 (msg2) communication of a four-step RACH procedure to a UE; and receiving a repeat of a msg3 communication of the four-step RACH procedure from the UE.

[0009] In some aspects, a UE for wireless communication includes: a memory and one or more processors coupled to the memory, the one or more processors being configured to: determine the number of repetitions of msg3 communication to be transmitted to a base station in a four-step RACH process; and transmit the repetitions of the msg3 communication to the base station based at least in part on the determination of the number of repetitions of the msg3 communication.

[0010] In some aspects, a base station for wireless communication includes: a memory and one or more processors coupled to the memory, the one or more processors being configured to: send msg2 communication of a four-step RACH procedure to a UE; and receive a repetition of msg3 communication of the four-step RACH procedure from the UE.

[0011] In some aspects, a non-transitory computer-readable medium storing a set of instructions for wireless communication includes: one or more instructions that, when executed by one or more processors of a UE, cause the UE to: determine the number of repetitions of msg3 communication to be sent to a base station for a four-step RACH procedure; and send the repetitions of the msg3 communication to the base station based at least in part on the determination of the number of repetitions of the msg3 communication.

[0012] In some aspects, a non-transitory computer-readable medium storing a set of instructions for wireless communication includes: one or more instructions that, when executed by one or more processors of a base station, cause the base station to: send msg2 communication of a four-step RACH procedure to a UE; and receive a repetition of msg3 communication of the four-step RACH procedure from the UE.

[0013] In some aspects, an apparatus for wireless communication at a user equipment includes: a unit for determining the number of repetitions of msg3 communication in a four-step RACH process to be transmitted to a base station; and a unit for transmitting the repetitions of the msg3 communication to the base station based at least in part on the determination of the number of repetitions of the msg3 communication.

[0014] In some aspects, an apparatus for wireless communication at a base station includes: a unit for transmitting msg2 communication of a four-step RACH procedure to a UE; and a unit for receiving repeating msg3 communication of the four-step RACH procedure from the UE.

[0015] In general, the aspects include methods, apparatus, systems, computer program products, non-transitory computer-readable media, user equipment, base stations, wireless communication equipment and / or processing systems as fully described herein with reference to the accompanying drawings and description and as shown by the accompanying drawings and description.

[0016] The foregoing has provided a fairly broad overview of the features and technical advantages of examples according to this disclosure in order to better understand the following detailed description. Additional features and advantages will be described below. The disclosed concepts and specific examples can be readily used as the basis for modifying or designing other structures for achieving the same purpose as this disclosure. Such equivalent constructions do not depart from the scope of the appended claims. The characteristics of the concepts disclosed herein (both their organization and manner of operation) and their associated advantages will be better understood when considered in conjunction with the accompanying drawings, based on the following description. Each drawing in the accompanying drawings is provided for illustrative and descriptive purposes and is not intended to define a limitation of the claims.

[0017] While aspects have been described herein by way of example, those skilled in the art will understand that such aspects can be implemented in many different arrangements and scenarios. The innovations described herein can be implemented using different platform types, devices, systems, shapes, sizes, and / or package arrangements. For example, some aspects can be implemented via integrated chip embodiments and other devices based on non-modular components (e.g., end-user equipment, vehicles, communication devices, computing devices, industrial equipment, retail / purchasing devices, medical devices, or AI-enabled devices). Aspects can be implemented in chip-level components, modular components, non-modular components, non-chip-level components, device-level components, or system-level components. Devices incorporating the described aspects and features may include additional components and features for the implementation and enforcement of the claimed and described aspects. For example, the transmission and reception of wireless signals may include multiple components for analog and digital purposes (e.g., hardware components including antennas, RF chains, power amplifiers, modulators, buffers, processors, interleavers, adders, or summers). The innovations described herein are intended to be implemented in a variety of devices, components, systems, distributed arrangements, or end-user equipment with different sizes, shapes, and configurations. Attached Figure Description

[0018] To gain a full understanding of the foregoing features of this disclosure, a more specific description can be obtained by referring to various aspects, some of which are illustrated in the accompanying drawings. However, it should be noted that the drawings illustrate only certain typical aspects of this disclosure and are therefore not intended to limit its scope, as other equally valid aspects are permissible under this description. The same reference numerals in different drawings may identify the same or similar elements.

[0019] Figure 1 This is a diagram illustrating an example of a wireless network according to this disclosure.

[0020] Figure 2 This is a diagram illustrating an example of communication between a base station and a UE in a wireless network according to this disclosure.

[0021] Figure 3 This is a diagram illustrating an example resource structure for wireless communication according to the present disclosure.

[0022] Figure 4 This is a diagram illustrating an example of a four-step random access process according to this disclosure.

[0023] Figure 5 This is a diagram illustrating an example of the repetition of message 3 (msg3) communication associated with a four-step random access channel (RACH) procedure according to this disclosure.

[0024] Figure 6 and 7 This is a diagram illustrating an example process associated with the repetition of msg3 communication in a four-step RACH process according to this disclosure. Detailed Implementation

[0025] The various aspects of this disclosure are described more fully below with reference to the accompanying drawings. However, this disclosure may be embodied in many different forms and should not be construed as limited to any particular 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 this disclosure to those skilled in the art. Based on the teachings herein, those skilled in the art will understand that the scope of this disclosure is intended to cover any aspect of this disclosure disclosed herein, whether implemented independently of or in combination with any other aspect of this disclosure. For example, an apparatus or a method may be implemented using any number of the aspects set forth herein. Furthermore, the scope of this disclosure is intended to cover such apparatuses or methods implemented using structures, functions, or structures and functions other than or different from the aspects of this disclosure set forth herein. It should be understood that any aspect of this disclosure disclosed herein may be embodied by one or more elements of the claims.

[0026] Several aspects of a telecommunications system will now be described with reference to various devices and techniques. These devices and techniques will be described in detail below and illustrated in the accompanying drawings, through various frames, modules, components, circuits, steps, processes, algorithms, etc. (collectively referred to as “elements”). These elements can be implemented using hardware, software, or a combination thereof. Whether such an element is implemented as hardware or software depends on the specific application and the design constraints imposed on the entire system.

[0027] It should be noted that while this document may use terms commonly associated with 5G or NR radio access technology (RAT) to describe aspects, aspects of this disclosure may be applied to other RATs, such as 3G RAT, 4G RAT and / or RATs after 5G (e.g., 6G).

[0028] Figure 1This is a diagram illustrating an example of a wireless network 100 according to this disclosure. Wireless network 100 may be or may include elements of a 5G (NR) network and / or an LTE network, as well as other examples. Wireless network 100 may include multiple base stations 110 (shown as BS 110a, BS 110b, BS 110c, and BS 110d) and other network entities. A base station (BS) is an entity that communicates with a user equipment (UE) and may also be referred to as an NR BS, Node B, gNB, 5G Node B (NB), access point, Transmit / Receive Point (TRP), etc. Each BS can provide communication coverage for a specific geographic area. In 3GPP, the term "cell" may refer to the coverage area of ​​a BS and / or the BS subsystem serving that coverage area, depending on the context in which the term is used.

[0029] A BS can provide communication coverage for macrocells, picocells, femtocells, and / or another type of cell. A macrocell can cover a relatively large geographic area (e.g., a radius of several kilometers) and can allow unrestricted access by UEs with service subscriptions. A picocell can cover a relatively small geographic area and can allow unrestricted access by UEs with service subscriptions. A femtocell can cover a relatively small geographic area (e.g., a residential area) and can allow restricted access by UEs associated with that femtocell (e.g., UEs in a Closed User Group (CSG)). A BS used for macrocells can be referred to as a macro BS. A BS used for picocells can be referred to as a pico BS. A BS used for femtocells can be referred to as a femtocell BS or a home BS. Figure 1 In the examples shown, BS 110a can be a macro BS for macro cell 102a, BS 110b can be a pico BS for pico cell 102b, and BS 110c can be a femto BS for femto cell 102c. A BS can support one or more (e.g., three) cells. The terms “eNB,” “base station,” “NR BS,” “gNB,” “TRP,” “AP,” “Node B,” “5G NB,” and “cell” are used interchangeably herein.

[0030] In some respects, the cell may not be stationary, and the geographical area of ​​the cell may move depending on the location of the mobile BS. In some respects, BSs may be interconnected with each other and / or with one or more other BSs or network nodes (not shown) in the wireless network 100 using any suitable transport network via various types of backhaul interfaces (such as direct physical connections or virtual networks).

[0031] The wireless network 100 may also include a relay station. A relay station is an entity that can receive data transmissions from an upstream station (e.g., a BS or a UE) and transmit the data transmissions to a downstream station (e.g., a UE or a BS). A relay station can also be a UE capable of relaying transmissions for other UEs. Figure 1 In the example shown, relay BS 110d can communicate with macro BS 110a and UE 120d to facilitate communication between BS 110a and UE 120d. A relay BS can also be referred to as a relay station, relay base station, repeater, etc.

[0032] Wireless network 100 can be a heterogeneous network comprising different types of Base Stations (BSs) such as macro BSs, pico BSs, femto BSs, relay BSs, etc. These different types of BSs can have different transmit power levels, different coverage areas, and different effects on interference in wireless network 100. For example, macro BSs can have high transmit power levels (e.g., 5 to 40 watts), while pico BSs, femto BSs, and relay BSs can have lower transmit power levels (e.g., 0.1 to 2 watts).

[0033] Network controller 130 can be coupled to a group of base stations (BSs) and can provide coordination and control for these BSs. Network controller 130 can communicate with the BSs via backhaul. BSs can also communicate with each other directly or indirectly, for example, via wireless or wired backhaul.

[0034] UE 120 (e.g., 120a, 120b, 120c) may be distributed throughout the wireless network 100, and each UE may be stationary or mobile. UE may also be referred to as an access terminal, terminal, mobile station, user unit, station, etc. UE may be a cellular phone (e.g., a smartphone), personal digital assistant (PDA), wireless modem, wireless communication device, handheld device, laptop computer, cordless phone, wireless local loop (WLL) station, tablet device, camera, gaming device, netbook, smartbook, ultrabook, medical device or apparatus, biometric sensor / device, wearable device (smartwatch, smart clothing, smart glasses, smart wristband, smart jewelry (e.g., smart ring, smart bracelet, etc.)), entertainment device (e.g., music or video device, or satellite radio unit, etc.), vehicle component or sensor, smart meter / sensor, industrial manufacturing equipment, GPS device, or any other suitable device configured to communicate via wireless or wired media.

[0035] Some UEs can be considered Machine-Type Communication (MTC) or Evolved or Enhanced Machine-Type Communication (eMTC) UEs. MTC and eMTC UEs include, for example, robots, drones, remote devices, sensors, meters, monitors, and / or location tags, which can communicate with a base station, another device (e.g., a remote device), or some other entity. Wireless nodes can provide connectivity to or to a network (e.g., a wide area network such as the Internet or cellular networks) via wired or wireless communication links, for example. Some UEs can be considered Internet of Things (IoT) devices, and / or can be implemented as NB-IoT (Narrowband Internet of Things) devices. Some UEs can be considered Customer Premises Equipment (CPE). UE 120 can be included within a housing housing the components of UE 120, such as processor components and / or memory components. In some aspects, the processor components and memory components can be coupled together. For example, the processor components (e.g., one or more processors) and memory components (e.g., memory) can be operatively coupled, communicatively coupled, electronically coupled, and / or electrically coupled.

[0036] Typically, any number of wireless networks can be deployed in a given geographical area. Each wireless network can support a specific RAT and can operate on one or more frequencies. A RAT can also be referred to as a radio technology, air interface, etc. A frequency can also be referred to as a carrier, channel, etc. Each frequency can support a single RAT in a given geographical area to avoid interference between wireless networks using different RATs. In some cases, NR or 5G RAT networks can be deployed.

[0037] In some respects, two or more UEs 120 (e.g., shown as UE 120a and UE 120e) may communicate directly using one or more sidelink channels (e.g., without using base station 110 as an intermediary for communication with each other). For example, UE 120 may communicate using peer-to-peer (P2P) communication, device-to-device (D2D) communication, vehicle-to-everything (V2X) protocols (e.g., which may include vehicle-to-vehicle (V2V) protocols, vehicle-to-infrastructure (V2I) protocols, etc.) and / or mesh networks. In this case, UE 120 may perform scheduling operations, resource selection operations, and / or other operations described herein as being performed by base station 110.

[0038] Devices in the wireless network 100 can communicate using the electromagnetic spectrum, which can be subdivided into various categories, bands, channels, etc., based on frequency or wavelength. For example, devices in the wireless network 100 can communicate using an operating band with a first frequency range (FR1) (spanning from 410 MHz to 7.125 GHz), and / or can communicate using an operating band with a second frequency range (FR2) (spanning from 24.25 GHz to 52.6 GHz). The frequencies between FR1 and FR2 are sometimes referred to as intermediate frequencies (IFs). Although a portion of FR1 is greater than 6 GHz, FR1 is generally referred to as the "below 6 GHz" band. Similarly, FR2 is generally referred to as the "millimeter wave" band, although it is different from the extremely high frequency (EHF) band (30 GHz–300 GHz) designated as the "millimeter wave" band by the International Telecommunication Union (ITU). Therefore, unless otherwise explicitly stated, it should be understood that the terms "below 6 GHz" and the like (if used herein) can broadly refer to frequencies below 6 GHz, frequencies within FR1, and / or intermediate frequencies (e.g., above 7.125 GHz). Similarly, unless otherwise explicitly stated, it should be understood that the terms "millimeter wave" and the like (if used herein) can broadly refer to frequencies within the EHF band, frequencies within FR2, and / or intermediate frequencies (e.g., below 24.25 GHz). It is anticipated that the frequencies included in FR1 and FR2 may be modified, and the techniques described herein are applicable to those modified frequency ranges.

[0039] As pointed out above, Figure 1 This is provided as an example. Other examples may differ from the one provided. Figure 1 The example described.

[0040] Figure 2 This is a diagram illustrating an example of communication between a base station 110 and a UE 120 in a wireless network 100 according to the present disclosure. The base station 110 may be equipped with T antennas 234a to 234t, and the UE 120 may be equipped with R antennas 252a to 252r, wherein generally, T ≥ 1 and R ≥ 1.

[0041] At base station 110, transmit processor 220 can receive data for one or more UEs from data source 212, select one or more modulation and coding schemes (MCS) for that UE based at least in part on channel quality indicators (CQI) received from each UE, process (e.g., code and modulate) the data for that UE based at least in part on the MCS selected for each UE, and provide data symbols for all UEs. Transmit processor 220 can also process system information (e.g., semi-static resource allocation information (SRPI)) and control information (e.g., CQI requests, grants, and / or upper-layer signaling), and provide overhead symbols and control symbols. Transmit processor 220 can also generate reference symbols for reference signals (e.g., cell-specific reference signals (CRS) or demodulation reference signals (DMRS)) and synchronization signals (e.g., primary synchronization signal (PSS) or secondary synchronization signal (SSS)). The transmit (TX) multiple-input multiple-output (MIMO) processor 230 can perform spatial processing (e.g., precoding, if applicable) on data symbols, control symbols, overhead symbols, and / or reference symbols, and can provide T output symbol streams to T modulators (MODs) 232a to 232t. Each modulator 232 can (e.g., for OFDM) process its corresponding output symbol stream to obtain an output sample stream. Each modulator 232 can further process (e.g., convert to analog, amplify, filter, and up-convert) the output sample stream to obtain a downlink signal. The T downlink signals from modulators 232a to 232t can be transmitted via T antennas 234a to 234t respectively.

[0042] At UE 120, antennas 252a to 252r can receive downlink signals from base station 110 and / or other base stations, and can provide the received signals to demodulators (DEMODs) 254a to 254r respectively. Each demodulator 254 can adjust (e.g., filter, amplify, down-convert, and digitize) the received signal to obtain an input sample. Each demodulator 254 can further process the input sample (e.g., for OFDM) to obtain a received symbol. MIMO detector 256 can obtain the received symbols from all R demodulators 254a to 254r, perform MIMO detection on the received symbols (if applicable), and provide the detected symbols. Receive processor 258 can process (e.g., demodulate and decode) the detected symbols, provide decoded data for UE 120 to data sink 260, and provide decoded control information and system information to controller / processor 280. The term "controller / processor" can refer to one or more controllers, one or more processors, or a combination thereof. The channel processor can determine Reference Signal Received Power (RSRP) parameters, Received Signal Strength Indicator (RSSI) parameters, Reference Signal Received Quality (RSRQ) parameters, and / or CQI parameters, as well as other examples. In some aspects, one or more components of the UE 120 may be included in a housing.

[0043] Network controller 130 may include communication unit 294, controller / processor 290, and memory 292. Network controller 130 may include one or more devices, such as those in a core network. Network controller 130 may communicate with base station 110 via communication unit 294.

[0044] Antennas (e.g., antennas 234a to 234t and / or antennas 252a to 252r) may include or be included within the following: one or more antenna panels, antenna groups, antenna element sets, and / or antenna arrays, and other examples. Antenna panels, antenna groups, antenna element sets, and / or antenna arrays may include one or more antenna elements. Antenna panels, antenna groups, antenna element sets, and / or antenna arrays may include coplanar antenna element sets and / or non-coplanar antenna element sets. Antenna panels, antenna groups, antenna element sets, and / or antenna arrays may include antenna elements within a single housing and / or multiple antenna elements within housings. Antenna panels, antenna groups, antenna element sets, and / or antenna arrays may include antenna elements coupled to one or more transmitting and / or receiving components (such as...) Figure 2 One or more antenna elements (one or more components).

[0045] On the uplink, at UE 120, the transmitting processor 264 can receive and process data from data source 262 and control information from controller / processor 280 (e.g., for reporting RSRP, RSSI, RSRQ, and / or CQI). The transmitting processor 264 can also generate reference symbols for one or more reference signals. Symbols from the transmitting processor 264 can be pre-coded (if applicable) by TX MIMO processor 266, further processed by modulators 254a to 254r (e.g., for DFT-s-OFDM or CP-OFDM), and transmitted to base station 110. In some aspects, the modulator and demodulator (e.g., MOD / DEMOD 254) of UE 120 can be included in the modem of UE 120. In some aspects, UE 120 includes a transceiver. The transceiver may include any combination of antenna 252, modulator and / or demodulator 254, MIMO detector 256, receive processor 258, transmit processor 264 and / or 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., as referenced). Figure 5-7 (Described).

[0046] At base station 110, uplink signals from UE 120 and other UEs can be received by antenna 234, processed by demodulator 232, detected by MIMO detector 236 (if applicable), and further processed by receiver processor 238 to obtain decoded data and control information transmitted by UE 120. Receiver processor 238 can provide decoded data to data sink 239 and decoded control information to controller / processor 240. Base station 110 may include communication unit 244 and communicate with network controller 130 via communication unit 244. Base station 110 may include scheduler 246 to schedule UE 120 for downlink and / or uplink communication. In some aspects, modulators and demodulators (e.g., MOD / DEMOD 232) of base station 110 may be included in the modem of base station 110. In some aspects, base station 110 includes a transceiver. The transceiver may include any combination of antenna 234, modulator and / or demodulator 232, MIMO detector 236, receive processor 238, transmit processor 220, and / or TX MIMO processor 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., as referenced). Figure 5-7 (Described).

[0047] The controller / processor 240 of base station 110, the controller / processor 280 of UE 120 and / or Figure 2 Any other components may perform one or more techniques associated with the repetition of message 3 (msg3) communication in the four-step RACH process, as described in more detail elsewhere herein. For example, the controller / processor 240 of base station 110, the controller / processor 280 of UE 120, and / or Figure 2 Any other component can perform or direct, for example Figure 6 Process 600 Figure 7 The operation of process 700 and / or other processes as described herein. Memory 242 and 282 may store data and program code for base station 110 and UE 120, respectively. In some aspects, memory 242 and / or memory 282 may include a non-transitory computer-readable medium storing one or more instructions (e.g., code and / or program code) for wireless communication. For example, one or more instructions, when executed by one or more processors of base station 110 and / or UE 120 (e.g., directly, or after compilation, translation, and / or interpretation), may cause one or more processors, UE 120, and / or base station 110 to perform or instruct, for example... Figure 6 Process 600 Figure 7 The operation of process 700 and / or other processes as described herein. In some aspects, the execution instructions may include run instructions, translation instructions, compilation instructions, and / or interpretation instructions, as well as other examples.

[0048] In some aspects, UE 120 may include: a unit for determining the number of repetitions of msg3 communication to be sent to the base station in a four-step RACH procedure; a unit for sending the repetitions of msg3 communication to the base station based at least in part on the determined number of repetitions of msg3 communication; and so on. In some aspects, such a unit may include a combination of Figure 2 One or more components of the described UE 120, such as controller / processor 280, transmit processor 264, TX MIMO processor 266, MOD 254, antenna 252, DEMOD 254, MIMO detector 256, receive processor 258, etc.

[0049] In some aspects, base station 110 may include: a unit for determining the number of repetitions of msg3 communication in a four-step RACH procedure to be transmitted by the UE; a unit for receiving repetitions of msg3 communication from the UE based at least in part on determining the number of repetitions of msg3 communication; and so on. In some aspects, base station 110 may include: a unit for transmitting msg2 communication in a four-step random access channel (RACH) procedure to the UE; a unit for receiving repetitions of msg3 communication in a four-step RACH procedure from the UE; and so on. In some aspects, such a unit may include a combination of Figure 2 One or more components of the described base station 110, such as antenna 234, DEMOD 232, MIMO detector 236, receiver processor 238, controller / processor 240, transmitter processor 220, TX MIMO processor 230, MOD 232, antenna 234, etc.

[0050] Although Figure 2 The boxes in the diagram are shown as different components, but the functions described above with respect to these boxes can be implemented in a single hardware, software, or combined component, or in various combinations of components. For example, the functions described with respect to transmit processor 264, receive processor 258, and / or TX MIMO processor 266 can be performed by or under the control of controller / processor 280.

[0051] As pointed out above, Figure 2 This is provided as an example. Other examples may differ from the one provided. Figure 2 The example described.

[0052] Figure 3 This is a diagram illustrating an example resource structure 300 for wireless communication according to the present disclosure. Resource structure 300 illustrates examples of various resource groups described herein. As shown, resource structure 300 may include subframes 305. Subframes 305 may include multiple time slots 310. Although resource structure 300 is shown as including 2 time slots per subframe, different numbers of time slots may be included in a subframe (e.g., 4 time slots, 8 time slots, 16 time slots, 32 time slots, etc.). In some aspects, different types of transmission time intervals (TTIs) may be used in addition to subframes and / or time slots. Time slots 310 may each include multiple symbols 315, such as 7 symbols or 14 symbols.

[0053] The potential control region of time slot 310 can be referred to as a control resource set (CORESET) 320 and can be configured to support efficient use of resources, for example, through flexible configuration or reconfiguration of resources in CORESET 320 for one or more physical downlink control channels (PDCCH), one or more physical downlink shared channels (PDSCH), etc. In some aspects, CORESET 320 may occupy the first symbol 315 of time slot 310, the first two symbols 315 of time slot 310, or the first three symbols 315 of time slot 310. Therefore, CORESET 320 may include multiple resource blocks (RBs) in the frequency domain and one, two, or three symbols 315 in the time domain. In 5G, the number of resources included in CORESET 320 can be flexibly configured, for example, by using Radio Resource Control (RRC) signaling to indicate the frequency domain region (e.g., number of resource blocks) and / or time domain region (e.g., number of symbols) for CORESET 320.

[0054] As shown in the figure, symbol 315, including CORESET 320, may include one or more control channel elements (CCEs) 325 spanning a portion of the system bandwidth; as an example, two CCEs 325 are shown. CCEs 325 may include downlink control information (DCI) for providing control information for wireless communication. The base station may transmit DCI during multiple CCEs 325 (as shown), where the number of CCEs 325 used for DCI transmission represents the aggregation level (AL) of the BS for DCI transmission. Figure 3 As an example, aggregation level two is shown, which corresponds to two CCEs 325 in slot 310. In some aspects, different aggregation levels can be used, such as 1, 4, 8, 16, etc.

[0055] Each CCE 325 may include a fixed number of resource element groups (REGs) 330 (shown as 4 REGs 330) or may include a variable number of REGs 330. In some aspects, the number of REGs 330 included in a CCE 325 may be specified by the RE bundle size. A REG 330 may include a resource block that may include 12 resource elements (REs) 335 within a symbol 315. A resource element 335 may occupy one subcarrier in the frequency domain and one OFDM symbol in the time domain.

[0056] The search space can include all possible locations where the PDCCH might be located (e.g., in time and / or frequency). The CORESET320 can include one or more search spaces, such as a UE-specific search space, a group common search space, and / or a common search space. The search space can indicate a set of CCE locations where the UE can find a PDCCH that can potentially be used to send control information to the UE. Possible locations for the PDCCH can depend on whether the PDCCH is a UE-specific PDCCH (e.g., for a single UE) or a group common PDCCH (e.g., for multiple UEs), the aggregation level used, etc. Possible locations for the PDCCH (e.g., in time and / or frequency) can be referred to as PDCCH candidates, and the set of all possible PDCCH locations can be referred to as the search space. For example, the set of all possible PDCCH locations for a specific UE can be referred to as a UE-specific search space. Similarly, the set of all possible PDCCH locations spanning all UEs can be referred to as a common search space. The set of all possible PDCCH locations for a specific group of UEs can be referred to as a group common search space.

[0057] CORESET 320 can be interleaved or non-interleaved. An interleaved CORESET 320 can have a CCE-to-REG mapping such that adjacent CCEs map to scattered REG bundles in the frequency domain (e.g., adjacent CCEs do not map to consecutive REG bundles of CORESET 320). A non-interleaved CORESET 320 can have a CCE-to-REG mapping such that all CCEs map to consecutive REG bundles of CORESET 320 (e.g., in the frequency domain).

[0058] As pointed out above, Figure 3 This is provided as an example. Other examples may differ from the one provided. Figure 3 The example described.

[0059] Figure 4 This is a diagram illustrating an example of a four-step random access procedure according to this disclosure. (See diagram for example.) Figure 4 As shown, base station 110 and UE 120 can communicate with each other to perform a four-step random access procedure.

[0060] As shown by reference numeral 405 in the attached figure, base station 110 can transmit and UE 120 can receive one or more synchronization signal blocks (SSBs) and random access configuration information. In some aspects, the random access configuration information may be transmitted and / or indicated by system information (e.g., in one or more system information blocks (SIBs)) and / or SSBs, for example for contention-based random access. Alternatively or additionally, the random access configuration information may be transmitted in radio resource control (RRC) messages and / or physical downlink control channel (PDCCH) command messages that trigger the random access channel (RACH) procedure, for example 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), one or more parameters for receiving a random access response (RAR), etc.

[0061] As shown by reference numeral 410 in the attached figure, UE 120 can transmit RAM, which may include a preamble (sometimes referred to as a random access preamble, physical RACH (PRACH) preamble, RAM preamble, etc.). During the four-step random access process, the message including the preamble may be referred to as Message 1, msg1, MSG1, first message, initial message, etc. The random access message may include a random access preamble identifier.

[0062] As shown by reference numeral 415 in the attached figure, base station 110 may send a RAR as a response to the preamble. During the four-step random access process, the message including the RAR may be referred to as message 2, msg2, MSG2, or a second message. In some aspects, the RAR may indicate the detected random access preamble identifier (e.g., received from UE 120 in msg1). Alternatively, the RAR may indicate the resource allocation to be used by UE 120 to send message 3 (msg3).

[0063] In some respects, as part of the second step of the four-step random access procedure, base station 110 may transmit PDCCH communications for RAR. The PDCCH communications may include downlink control information (DCI) (e.g., cyclic redundancy check (CRC) scrambled with a random access radio network temporary identifier (RA-RNTI)) that schedules PDSCH communications including RAR. For example, the PDCCH communications may indicate resource allocation for PDSCH communications. Also as part of the second step of the four-step random access procedure, base station 110 may transmit PDSCH communications for RAR, as scheduled by the PDCCH communications. RAR may be included in the Media Access Control (MAC) Protocol Data Unit (PDU) of the PDSCH communications.

[0064] As shown by reference numeral 420 in the attached figure, UE 120 can send an RRC connection request message. The RRC connection request message may be referred to as message 3, msg3, MSG3, or the third message in the four-step random access procedure. In some aspects, the RRC connection request may include the UE identifier, uplink control information (UCI), physical uplink shared channel (PUSCH) communication (e.g., the RRC connection request), etc.

[0065] As shown by reference numeral 425 in the attached figure, base station 110 can send an RRC connection establishment message. The RRC connection establishment message may be referred to as message 4, msg4, MSG4, or the fourth message in the four-step random access procedure. In some aspects, the RRC connection establishment message may include the detected UE identifier, timing advance value, contention resolution information, etc. As shown by reference numeral 430 in the attached figure, if UE 120 successfully receives the RRC connection establishment message, UE 120 can send a Hybrid Automatic Repeat Request (HARQ) acknowledgment (ACK).

[0066] In some cases, the RRC connection establishment message may be delayed. For example, in some situations, UE 120 may need to retransmit the msg3 communication to the base station (e.g., an RRC connection request message). Specifically, if base station 110 does not receive the msg3 communication or is unable to decode the msg3 communication, base station 110 may send PDCCH communication for msg3 retransmission. The PDCCH communication may include DCI scheduling the msg3 retransmission (e.g., CRC scrambled via Temporary Cell RNTI (TC-RNTI)).

[0067] Therefore, msg3 communication can become a bottleneck in the four-step random access process, especially when multiple retransmissions of msg3 communication are required to successfully deliver the RRC connection request message to base station 110. This can increase the latency associated with UE 120 obtaining initial access to the network. Furthermore, UE 120 receives separate PDCCHs for scheduling RAR (e.g., providing resource allocation for initial msg3 communication) and scheduling each msg3 retransmission, resulting in significant PDCCH overhead.

[0068] Some techniques and apparatus described herein provide msg3 PUSCH repetition (e.g., repetition of PUSCH carrying msg3) to extend msg3 coverage. In some aspects, the UE can send multiple repetitions of the initial transmission of msg3 communication. Alternatively, the UE can send multiple repetitions of retransmissions of msg3 communication. In some aspects, the base station can implicitly indicate the number (e.g., quantity) of repetitions to be sent by the UE 120. For example, the number of repetitions can be implicitly indicated by the aggregation level of the PDCCH, which schedules msg2 communication via PDSCH or msg3 retransmission. In some aspects, the base station and / or the UE can determine the number of repetitions at least in part based on channel quality, transmit power, the UE's location relative to the base station, msg1 communication group, etc., thereby improving the efficiency of repetition configuration. That is, the number of repetitions of msg3 communication in the four-step RACH process can be determined based on information or parameters associated with the four-step RACH process. In this way, the performance of msg3 communication can be improved, thereby increasing the speed of the four-step random access process, reducing PDCCH overhead, reducing initial access delay, etc.

[0069] As pointed out above, Figure 4 This is provided as an example. Other examples may differ from the one provided. Figure 4 The example described.

[0070] Figure 5 This is a diagram illustrating example 500 of the repetition of msg3 communication in a four-step RACH process according to this disclosure. Figure 5 As shown, Example 500 includes a base station 110 and a UE 120 that can communicate with each other. For example, base station 110 and UE 120 can communicate in conjunction with UE 120 obtaining initial access to a network associated with base station 110. In some aspects, UE 120 and base station 110 can perform a four-step random access procedure (also referred to herein as a four-step RACH procedure).

[0071] As shown by reference numeral 505 in the accompanying drawings, base station 110 can transmit and UE 120 can receive random access configuration information, as described above. In some aspects, the random access configuration information can identify one or more msg1 communication groups. For example, one or more PRACH preambles can be associated with a msg1 communication group. As another example, one or more msg1 formats can be associated with a msg1 communication group. The msg1 format can be associated with specific time and / or frequency resources used for transmitting msg1 communication. The msg1 communication group can be associated with a specific number (e.g., quantity) of repetitions used for msg3 communication. For example, a first msg1 communication group can be associated with a first repetition quantity used for msg3 communication, and a second msg1 communication group can be associated with a second repetition quantity used for msg3 communication.

[0072] In some aspects, random access configuration information can identify one or more repetition sets. A repetition set can identify a specific number of repetitions to be used for msg3 communication. For example, a first repetition set can be associated with a first number of repetitions used for msg3 communication, and a second repetition set can be associated with a second number of repetitions used for msg3 communication. Furthermore, a repetition set can be associated with a specific transmit power used by UE 120. For example, a first repetition set can be associated with a first power value that meets a threshold power value, and a second repetition set can be associated with a second power value that does not meet the threshold power value.

[0073] In some aspects, base station 110 may send to UE 120 one or more different configurations (e.g., in addition to random access channel configurations) that identify one or more msg1 communication groups and / or one or more repeat sets. In some aspects, information identifying one or more msg1 communication groups and / or one or more repeat sets may be provided to UE 120.

[0074] As shown by reference numeral 510 in the accompanying drawings, UE 120 can transmit and base station 110 can receive msg1 communication (e.g., RAM), as described above. In some aspects, UE 120 can use a specific power to transmit msg1 communication, and the specific power can be associated with a specific power margin of UE 120.

[0075] In some aspects, UE 120 can determine the number (e.g., quantity) of repetitions to be used for msg3 communication (e.g., based at least in part on channel quality, the distance between UE 120 and base station 110, etc.). In this case, msg1 communication can indicate (e.g., recommend) the number of repetitions determined by UE 120 to base station 110. For example, msg1 communication can indicate the number of repetitions at least in part based on the msg1 communication group to which msg1 communication belongs. As an example, when msg1 communication is associated with a first msg1 communication group, msg1 communication can indicate a first number of repetitions for msg3 communication, and when msg1 communication is associated with a second msg1 communication group, msg1 communication can indicate a second number of repetitions for msg3 communication. In this way, base station 110 can use the number of repetitions indicated by UE 120 to determine a more efficient configuration of the number of repetitions used for msg3 communication.

[0076] In some respects, base station 110 can determine the number of repetitions to be used for msg3 communication. For example, base station 110 can determine the number of repetitions based at least in part on measurements (e.g., quality measurements) of the PRACH carrying msg1 communication.

[0077] As shown by reference numeral 515 in the attached figure, base station 110 can transmit and UE 120 can receive msg2 communication (e.g., RAR), as described above. In some aspects, UE 120 can receive msg2 communication in a PDSCH scheduled by DCI carried in the PDCCH. The CRC of the DCI can be scrambled via RA-RNTI. msg2 communication may include information identifying resource allocation for msg3 communication.

[0078] In some aspects, the PDCCH carrying the DCI can be associated with a specific aggregation level. For example, base station 110 can transmit (e.g., and UE 120 can receive) the PDCCH using an aggregation level at least partially based on the number of repetitions determined for msg3 communication. Therefore, UE 120 can determine the number of repetitions for msg3 communication at least partially based on the aggregation level associated with the PDCCH scheduling msg2 communication (e.g., the PDCCH used to detect the scheduling of msg2 communication). That is, the number of repetitions can be implicitly indicated by the aggregation level associated with the PDCCH. In this way, base station 110 can configure the number of repetitions for msg3 communication for UE 120 at least partially based on the aggregation level associated with the PDCCH (e.g., instead of explicitly indicating the number of repetitions in the DCI, RRC configuration, or system information). In some aspects, UE 120 can transmit the number of repetitions for the initial transmission or retransmission of msg3 communication, which is determined at least partially based on the PDCCH scheduling msg2 communication.

[0079] A series of repeated msg3 communications (e.g., multiple repetitions of msg3 communications) may include a first transmission of msg3 communications and one or more subsequent transmissions of msg3 communications (if any). A series of repeated msg3 communications (e.g., multiple repetitions of msg3 communications) may be an initial transmission of msg3 communications (e.g., msg3 communications scheduled by msg2 communications, which are scheduled by a DCI with a CRC scrambled via RA-RNTI). For example, multiple repetitions of the initial transmission of msg3 communications may include a first transmission of the initial transmission and one or more subsequent transmissions of the initial transmission. A series of repeated msg3 communications (e.g., multiple repetitions of msg3 communications) may be retransmissions of msg3 communications (e.g., msg3 communications scheduled by a DCI with a CRC scrambled via TC-RNTI). For example, multiple repetitions of retransmissions of msg3 communications may include a first retransmission and one or more subsequent retransmissions.

[0080] In some aspects, UE 120 can determine a first number of repetitions for msg3 communication when the aggregation level is a first aggregation level, and a second number of repetitions for msg3 communication when the aggregation level is a second aggregation level. For example, if the aggregation level is less than or equal to a first value (e.g., 4), this can indicate that repetitions for msg3 communication are not enabled, i.e., the number of repetitions is 1. As another example, if the aggregation level has a second value (e.g., 8), this can indicate that a first number of repetitions (K1) for msg3 communication should be used (e.g., K1 = 2). As yet another example, if the aggregation level has a third value (e.g., 16), this can indicate that a second number of repetitions (K2) for msg3 communication should be used (e.g., K2 = 4).

[0081] In some aspects, UE 120 can determine a first number of repetitions for msg3 communication when the aggregation level meets a first threshold value, and a second number of repetitions for msg3 communication when the aggregation level does not meet the first threshold value. For example, if the aggregation level is less than or equal to the threshold value (T) (e.g., T = 4), this can indicate that a first number of repetitions (K1) (e.g., K1 = 2) should be used for msg3 communication. As another example, if the aggregation level is greater than the threshold value (T), this can indicate that a second number of repetitions (K2) (e.g., K2 = 4) should be used for msg3 communication. It should be noted that any number of threshold values ​​can be configured. For example, if the aggregation level meets a second threshold value that is greater than the first threshold value, this can indicate that a third number of repetitions (K3) (e.g., K3 = 6) should be used for msg3 communication.

[0082] As shown by reference numeral 520 in the accompanying drawings, UE 120 can transmit and base station 110 can receive multiple repetitions (e.g., PUSCH repetitions) of msg3 communication (e.g., initial msg3 communication), as described above (e.g., UE 120 can repeatedly transmit msg3 communication). Multiple repetitions of msg3 communication may use different time resources (e.g., to improve time diversity of msg3 communication), different frequency resources (e.g., to improve frequency diversity of msg3 communication), different beams (e.g., to improve spatial diversity of msg3 communication), and so on. In some aspects, UE 120 may be configured with information indicating the resources, beams, etc., to be used by UE 120 for repetitions of msg3 communication.

[0083] In some aspects, UE 120 may transmit repeats of msg3 communication based on a number of repeats determined by UE 120 at least in part based on the aggregation level of the PDCCH scheduling msg2 communication. Alternatively, UE 120 may determine the number of repeats for msg3 communication based at least in part on the power used by UE 120 to transmit msg1 communication. For example, UE 120 may select a repeat set from one or more repeat sets configured for UE 120 based at least in part on the power used by UE 120, as described above. In some aspects, UE 120 may determine a first number of repeats for msg3 communication when the power value meets a threshold value (e.g., when the power value is less than or equal to the threshold value), and a second number of repeats for msg3 communication when the power value does not meet the threshold value (e.g., when the power value is greater than the threshold value). Therefore, UE 120 may transmit repeats of msg3 communication based on a number of repeats determined by UE 120 at least in part based on the power used by UE 120 for msg1 communication, as described above.

[0084] In some aspects, UE 120 may not send a duplicate of the initial msg3 communication. In other aspects, UE 120 may send a duplicate of the msg3 communication retransmission, either in addition to sending a duplicate of the initial msg3 communication or as an alternative to sending a duplicate of the initial msg3 communication. For example, UE 120 may send duplicates for msg3 communication retransmission, and the number of duplicates may be at least partially based on the aggregation level of the PDCCH scheduling msg2 communication, as described above. Even without sending a duplicate of the initial msg3 communication, sending a duplicate of the msg3 communication retransmission can reduce initial access latency.

[0085] In some aspects, UE 120 can receive a PDCCH carrying a DCI for scheduling msg3 communication retransmissions. The CRC of the DCI can be scrambled via TC-RNTI. In some aspects, the PDCCH carrying the DCI can be associated with a specific aggregation level. For example, base station 110 can transmit (e.g., and UE 120 can receive) a PDCCH using an aggregation level at least partially based on the number of repetitions determined for msg3 communication retransmissions. Therefore, UE 120 can determine the number of repetitions for msg3 communication retransmissions at least partially based on the aggregation level associated with the PDCCH for scheduling msg3 communication retransmissions (e.g., for detecting the PDCCH for scheduling msg3 communication retransmissions), as described above. That is, the number of repetitions can be implicitly indicated by the aggregation level associated with the PDCCH. In some aspects, UE 120 can transmit repetitions of msg3 communication retransmissions and can determine the number of repetitions at least partially based on the PDCCH for scheduling msg3 communication retransmissions.

[0086] In some aspects, UE 120 may transmit a UCI along with msg3 communication. That is, msg3 communication may include a UCI, may be multiplexed with a UCI (e.g., a UCI may be multiplexed with msg3 PUSCH), or may be combined with a UCI in other ways. In some aspects, the UCI may include (e.g., carry) information that enables base station 110 to determine the number of repetitions to be used for msg3 communication (e.g., msg3 initial transmission or msg3 retransmission). For example, the UCI may indicate (e.g., recommend) the number of repetitions for msg3 communication (e.g., a UCI multiplexed with msg3 initial transmission may recommend the number of repetitions for msg3 retransmission). As another example, the UCI may indicate downlink quality measurements (e.g., coarse downlink quality measurements), power headroom reports related to the transmission of msg1 communication (e.g., power headroom reports after the transmission of msg1 communication), etc. Base station 110 can determine that a specific downlink quality measurement or a downlink quality measurement that meets a threshold (e.g., less than or equal to a threshold) is associated with a specific number of repetitions used for msg3 communication. Similarly, base station 110 can determine that a specific power margin value or a power margin value that meets a threshold is associated with a specific number of repetitions used for msg3 communication.

[0087] In some aspects, base station 110 may indicate to UE 120 a beta factor to be used for UCI (e.g., for resource determination for UCI). A scaling factor related to the channel coding rate between the data channel (e.g., PUSCH) and UCI may be referred to as the "beta factor". For example, the channel coding rate for UCI may correspond to the channel coding rate for PUSCH divided by the beta factor (e.g., ).

[0088] In some aspects, random access configuration information can indicate the beta factor. In some aspects, the DCI for scheduling msg2 communication (e.g., a DCI with CRC scrambled via RA-RNTI) can indicate the beta factor. For example, the DCI can indicate the beta factor in one or more bits (e.g., reserved bits). In some aspects, the DCI for scheduling msg3 communication retransmissions (e.g., a DCI with CRC scrambled via TC-RNTI) can indicate the beta factor. For example, the DCI can indicate the beta factor in one or more bits (e.g., reserved bits) and / or one or more fields (e.g., reserved fields) (such as the new data indicator field (allocated 1 bit), the HARQ process number field (allocated 4 bits), etc.). Two bits can be used to indicate the beta factor.

[0089] UE 120 can determine the amount of resources (e.g., quantity) to be used for UCI based at least in part on the beta factor. For example, UE 120 can determine the amount of resources based at least in part on the payload size of UCI, the coding rate of the PUSCH multiplexed with UCI, and the beta factor (e.g., the channel coding rate for UCI is equal to the channel coding rate for PUSCH divided by the beta factor). As mentioned above, the beta factor can be dynamically indicated in DCI, or it can be configured semi-statically via RRC signaling.

[0090] As shown by reference numeral 525 in the attached figure, base station 110 can transmit and UE 120 can receive msg4 communication (e.g., RRC connection establishment message). Base station 110 can transmit msg4 communication in response to receiving one or more repetitions of msg3 communication. Therefore, repetition of msg3 communication increases coverage for msg3 communication, thereby increasing the likelihood that base station 110 will receive and be able to decode msg3 communication. In this way, the performance of msg3 communication can be improved, thereby increasing the speed of the four-step random access procedure, reducing PDCCH overhead, reducing initial access delay, etc.

[0091] As pointed out above, Figure 5 This is provided as an example. Other examples may differ from the one provided. Figure 5 The example described.

[0092] Figure 6 This is a diagram illustrating an example procedure 600 performed by a UE, for example, according to this disclosure. Example procedure 600 is an example in which a UE (e.g., UE 120, etc.) performs an operation repeatedly associated with msg3 communication of a four-step RACH procedure.

[0093] like Figure 6 As shown, in some aspects, process 600 may include: determining the number of repetitions of the msg3 communication to be sent to the base station in the four-step RACH process (box 610). For example, the UE (e.g., using receive processor 258, transmit processor 264, controller / processor 280, memory 282, etc.) may determine the number of repetitions of the msg3 communication to be sent to the base station in the four-step RACH process, as described above in conjunction with... Figure 5 Described.

[0094] like Figure 6As further shown, in some aspects, process 600 may include: sending repeats of msg3 communication to the base station at least in part based on determining the number of repeats of msg3 communication (box 620). For example, the UE (e.g., using controller / processor 280, transmit processor 264, TX MIMO processor 266, MOD 254, antenna 252, etc.) may send repeats of msg3 communication to the base station at least in part based on determining the number of repeats of msg3 communication, as described above in conjunction with... Figure 5 Described.

[0095] Process 600 may include additional aspects, such as any single aspect or any combination thereof described below and / or in conjunction with one or more other process descriptions elsewhere described herein.

[0096] In the first aspect, the number of repetitions in msg3 communication is determined at least in part based on the aggregation level associated with PDCCH.

[0097] In the second aspect, either alone or in combination with the first aspect, the PDCCH carries downlink control information for the msg2 communication of the four-step RACH process.

[0098] In the third aspect, either alone or in combination with one or more of the first and second aspects, msg3 communication is an initial transmission or a retransmission.

[0099] In the fourth aspect, either alone or in combination with one or more of the first to third aspects, the PDCCH carries downlink control information for scheduling msg3 communication retransmissions.

[0100] In the fifth aspect, either alone or in combination with one or more of the first to fourth aspects, msg3 communication is a retransmission.

[0101] In the sixth aspect, either alone or in combination with one or more of the first to fifth aspects, when the aggregation level is a first aggregation level, the number of repetitions of msg3 communication is determined as a first number of repetitions of msg3 communication, and when the aggregation level is a second aggregation level, the number of repetitions of msg3 communication is determined as a second number of repetitions of msg3 communication.

[0102] In the seventh aspect, either alone or in combination with one or more of the first to sixth aspects, the number of repetitions of msg3 communication is determined as a first number of repetitions of msg3 communication when the aggregation level meets a threshold value (e.g., when the aggregation level is less than or equal to the threshold value), and the number of repetitions of msg3 communication is determined as a second number of repetitions of msg3 communication when the aggregation level does not meet the threshold value.

[0103] In the eighth aspect, either alone or in combination with one or more of the first to seventh aspects, the number of repetitions of msg3 communication is based at least in part on the base station's measurement of the physical RACH of msg1 communication carrying a four-step RACH process.

[0104] In the ninth aspect, either alone or in combination with one or more of the first to eighth aspects, process 600 includes: sending a msg1 communication of a four-step RACH process, the msg1 communication indicating the number of repetitions of the msg3 communication.

[0105] In the tenth aspect, either alone or in combination with one or more of the first to ninth aspects, when the msg1 communication is associated with a first msg1 communication group, the msg1 communication indicates a first number of repetitions of the msg3 communication, and when the msg1 communication is associated with a second msg1 communication group, the msg1 communication indicates a second number of repetitions of the msg3 communication.

[0106] In the eleventh aspect, either alone or in combination with one or more of the first to tenth aspects, the number of repetitions of msg3 communication is based at least in part on the power of msg1 communication used by the UE to transmit the four-step RACH procedure.

[0107] In the twelfth aspect, either alone or in combination with one or more of the first to eleventh aspects, the number of repetitions of msg3 communication is a first number of repetitions of msg3 communication when the power value meets a threshold value (e.g., when the power value is less than or equal to the threshold value), and the number of repetitions of msg3 communication is a second number of repetitions of msg3 communication when the power value does not meet the threshold value.

[0108] In the thirteenth aspect, alone or in combination with one or more of the first to twelfth aspects, the UCI is multiplexed with msg3 communication, and the UCI indicates at least one of the following: the number of repetitions of msg3 communication, downlink quality measurement, or power margin report.

[0109] In the fourteenth aspect, alone or in combination with one or more aspects from the first to the thirteenth aspects, process 600 includes: receiving an indication of a beta factor to be used for UCI resource determination.

[0110] In the fifteenth aspect, alone or in combination with one or more of the first to fourteenth aspects, the indication is received in at least one of the following: one or more bits of downlink control information of msg2 communication scheduling the four-step RACH process, one or more bits or one or more fields of downlink control information of msg3 communication retransmission scheduling, or system information messages associated with RACH configuration.

[0111] In the sixteenth aspect, either alone or in combination with one or more of the first to fifteenth aspects, the repetition of msg3 communication is the repetition of PUSCH carrying msg3.

[0112] In the seventeenth aspect, either alone or in combination with one or more of the first to sixteenth aspects, the number of repetitions of msg3 communication is determined at least in part based on the power of msg1 communication used by the UE to transmit the four-step RACH procedure.

[0113] In the eighteenth aspect, either alone or in combination with one or more of the first to seventeenth aspects, the number of repetitions of msg3 communication is determined as a first number of repetitions of msg3 communication when the power value meets a threshold value (e.g., when the power value is less than or equal to the threshold value), and the number of repetitions of msg3 communication is determined as a second number of repetitions of msg3 communication when the power value does not meet the threshold value.

[0114] In the nineteenth aspect, either alone or in combination with one or more aspects from the first to the eighteenth aspects, msg3 communication is multiplexed with uplink control information (UCI) in the physical uplink shared channel, which indicates at least one of the following: the number of repetitions of msg3 communication, downlink quality measurement, or power margin report for message 1 communication used in the four-step RACH procedure.

[0115] Although Figure 6 An example box of process 600 is shown, but in some aspects, process 600 may include... Figure 6 The boxes depicted in the diagram are compared to additional boxes, fewer boxes, different boxes, or boxes arranged in a different manner. Alternatively, two or more boxes in process 600 may be executed in parallel.

[0116] Figure 7 This is a diagram illustrating an example process 700 performed by a base station, for example, according to this disclosure. Example process 700 is an example in which a base station (e.g., base station 110, etc.) performs operations repeatedly associated with msg3 communication of a four-step RACH process.

[0117] like Figure 7As shown, in some aspects, process 700 may include sending msg2 communication of the four-step RACH procedure to the UE (block 710). For example, a base station (e.g., using a transmit processor 220, a receive processor 238, a controller / processor 240, a memory 242, etc.) may send msg2 communication of the four-step RACH procedure to the UE, as described above in conjunction with... Figure 5 Described.

[0118] like Figure 7 As further shown, in some aspects, process 700 may include: receiving a repetition of the msg3 communication of the four-step RACH process from the UE (box 720). For example, a base station (e.g., using antenna 234, DEMOD 232, MIMO detector 236, receive processor 238, controller / processor 240, etc.) may receive a repetition of the msg3 communication of the four-step RACH process from the UE, as described above in conjunction with... Figure 5 Described.

[0119] In some aspects, process 700 may include: determining the number of repetitions of the msg3 communication in the four-step RACH procedure to be transmitted by the UE. For example, the base station (e.g., using transmit processor 220, receive processor 238, controller / processor 240, memory 242, etc.) may determine the number of repetitions of the msg3 communication in the four-step RACH procedure to be transmitted by the UE, as described above. Figure 5 Described. In some aspects, process 700 may include: receiving repeats of msg3 communication from the UE based at least in part on determining the number of repeats of msg3 communication. For example, a base station (e.g., using antenna 234, DEMOD 232, MIMO detector 236, receive processor 238, controller / processor 240, etc.) may receive repeats of msg3 communication from the UE based at least in part on determining the number of repeats of msg3 communication, as described above. Figure 5 Described.

[0120] Process 700 may include additional aspects, such as any single aspect or any combination thereof described below and / or in conjunction with one or more other process descriptions elsewhere described herein.

[0121] In the first aspect, process 700 includes: sending PDCCH using an aggregation level that is at least partially based on the number of repetitions used for msg3 communication.

[0122] In the second aspect, either alone or in combination with the first aspect, the PDCCH carries downlink control information for scheduling msg2 communications.

[0123] In the third aspect, either alone or in combination with one or more of the first and second aspects, msg3 communication is an initial transmission or a retransmission.

[0124] In the fourth aspect, either alone or in combination with one or more of the first to third aspects, the PDCCH carries downlink control information for scheduling msg3 communication retransmissions.

[0125] In the fifth aspect, either alone or in combination with one or more of the first to fourth aspects, msg3 communication is a retransmission.

[0126] In the sixth aspect, either alone or in combination with one or more of the first to fifth aspects, when the aggregation level is the first aggregation level, the number of repetitions of msg3 communication is the first number of repetitions of msg3 communication, and when the aggregation level is the second aggregation level, the number of repetitions of msg3 communication is the second number of repetitions of msg3 communication.

[0127] In the seventh aspect, either alone or in combination with one or more of the first to sixth aspects, the number of repetitions of msg3 communication is a first number of repetitions of msg3 communication when the aggregation level meets a threshold value (e.g., when the aggregation level is less than or equal to the threshold value), and the number of repetitions of msg3 communication is a second number of repetitions of msg3 communication when the aggregation level does not meet the threshold value.

[0128] In the eighth aspect, either alone or in combination with one or more of the first to seventh aspects, the number of repetitions of msg3 communication is based at least in part on the base station's measurement of the physical RACH of msg1 communication carrying a four-step RACH process.

[0129] In the ninth aspect, either alone or in combination with one or more of the first to eighth aspects, process 700 includes: receiving a msg1 communication of a four-step RACH process, the msg1 communication indicating the number of repetitions of the msg3 communication.

[0130] In the tenth aspect, either alone or in combination with one or more of the first to ninth aspects, when the msg1 communication is associated with a first msg1 communication group, the msg1 communication indicates a first number of repetitions of the msg3 communication, and when the msg1 communication is associated with a second msg1 communication group, the msg1 communication indicates a second number of repetitions of the msg3 communication.

[0131] In the eleventh aspect, either alone or in combination with one or more of the first to tenth aspects, the number of repetitions of msg3 communication is based at least in part on the power of msg1 communication used by the UE to transmit the four-step RACH procedure.

[0132] In the twelfth aspect, either alone or in combination with one or more of the first to eleventh aspects, the number of repetitions of msg3 communication is a first number of repetitions of msg3 communication when the power value meets a threshold value (e.g., when the power value is less than or equal to the threshold value), and the number of repetitions of msg3 communication is a second number of repetitions of msg3 communication when the power value does not meet the threshold value.

[0133] In the thirteenth aspect, alone or in combination with one or more of the first to twelfth aspects, the UCI is multiplexed with msg3 communication, and the UCI indicates at least one of the following: the number of repetitions of msg3 communication, downlink quality measurement, or power margin report.

[0134] In the fourteenth aspect, alone or in combination with one or more aspects from the first to the thirteenth aspects, process 700 includes: sending an indication of a beta factor to be used for UCI resource determination.

[0135] In the fifteenth aspect, either alone or in combination with one or more of the first to fourteenth aspects, the indication is sent in at least one of the following: one or more bits of downlink control information scheduling msg2 communication, one or more bits or one or more fields of downlink control information scheduling msg3 communication retransmission, or a system information message associated with RACH configuration.

[0136] In the sixteenth aspect, either alone or in combination with one or more of the first to fifteenth aspects, the repetition of msg3 communication is the repetition of PUSCH carrying msg3.

[0137] In the seventeenth aspect, either alone or in combination with one or more of the first to sixteenth aspects, the number of repetitions of msg3 communication is determined at least in part based on the aggregation level associated with PDCCH.

[0138] In the eighteenth aspect, either alone or in combination with one or more of the first to seventeenth aspects, when the aggregation level is a first aggregation level, the number of repetitions of msg3 communication is determined as a first number of repetitions of msg3 communication, and when the aggregation level is a second aggregation level, the number of repetitions of msg3 communication is determined as a second number of repetitions of msg3 communication.

[0139] In the nineteenth aspect, either alone or in combination with one or more of the first to eighteenth aspects, the number of repetitions of msg3 communication is determined as a first number of repetitions of msg3 communication when the aggregation level meets a threshold value (e.g., when the aggregation level is less than or equal to the threshold value), and the number of repetitions of msg3 communication is determined as a second number of repetitions of msg3 communication when the aggregation level does not meet the threshold value.

[0140] In the twentieth aspect, either alone or in combination with one or more of the first to nineteenth aspects, the number of repetitions of msg3 communication is determined at least in part based on the power of msg1 communication used by the UE to transmit the four-step RACH procedure.

[0141] In the twenty-first aspect, either alone or in combination with one or more of the first to twentieth aspects, the number of repetitions of msg3 communication is determined as a first number of repetitions of msg3 communication when the power value meets a threshold value (e.g., when the power value is less than or equal to the threshold value), and the number of repetitions of msg3 communication is determined as a second number of repetitions of msg3 communication when the power value does not meet the threshold value.

[0142] In aspect 22, either alone or in combination with one or more of aspects 1 to 21, msg3 communication is multiplexed with UCI in PUSCH, which indicates at least one of the following: the number of repetitions of msg3 communication, downlink quality measurement, or power margin reporting for message 1 communication used in the four-step RACH process.

[0143] Although Figure 7 An example box of process 700 is shown, but in some aspects, process 700 may include... Figure 7 The boxes depicted in the diagram are compared to additional boxes, fewer boxes, different boxes, or boxes arranged in a different manner. Alternatively, two or more boxes in process 700 may be executed in parallel.

[0144] The following provides a summary of some aspects of this disclosure:

[0145] Aspect 1: A method for wireless communication performed by a user equipment (UE), comprising: determining the number of repetitions of a message 3 (msg3) communication to be transmitted to a base station in a four-step random access channel (RACH) procedure; and transmitting the repetitions of the msg3 communication to the base station based at least in part on the determination of the number of repetitions of the msg3 communication.

[0146] Aspect 2: According to the method of aspect 1, wherein the number of repetitions of the msg3 communication is determined at least in part based on the aggregation level associated with the physical downlink control channel (PDCCH).

[0147] Aspect 3: According to the method of aspect 2, wherein the PDCCH carries downlink control information (DCI) for scheduling the four-step RACH process for message 2 communication.

[0148] Aspect 4: According to the method of aspect 3, wherein the msg3 communication is an initial transmission or a retransmission.

[0149] Aspect 5: According to the method of aspect 2, wherein the PDCCH carries downlink control information (DCI) for scheduling the msg3 communication.

[0150] Aspect 6: According to the method described in aspect 5, wherein the msg3 communication is a retransmission.

[0151] Aspect 7: The method according to any one of Aspects 2-6, wherein when the aggregation level is a first aggregation level, the number of repetitions of the msg3 communication is determined as a first number of repetitions of the msg3 communication, and when the aggregation level is a second aggregation level, the number of repetitions of the msg3 communication is determined as a second number of repetitions of the msg3 communication.

[0152] Aspect 8: The method according to any one of Aspects 2-6, wherein when the aggregation level meets a threshold value, the number of repetitions of the msg3 communication is determined as a first number of repetitions of the msg3 communication, and when the aggregation level does not meet the threshold value, the number of repetitions of the msg3 communication is determined as a second number of repetitions of the msg3 communication.

[0153] Aspect 9: The method according to any one of Aspects 1-8, wherein the number of repetitions of the msg3 communication is based at least in part on a measurement of the physical RACH of the message 1 communication carrying the four-step RACH process.

[0154] Aspect 10: The method according to any one of aspects 1-9 further includes: sending a message 1 (msg1) communication of the four-step RACH process, the msg1 communication indicating the number of repetitions of the msg3 communication.

[0155] Aspect 11: The method according to aspect 10, wherein when the msg1 communication is associated with a first msg1 communication group, the msg1 communication indicates the first number of repetitions of the msg3 communication, and when the msg1 communication is associated with a second msg1 communication group, the msg1 communication indicates the second number of repetitions of the msg3 communication.

[0156] Aspect 12: The method according to any one of Aspects 1-8, wherein the number of repetitions of the msg3 communication is at least partially based on the power of the Message 1 communication used by the UE to transmit the four-step RACH procedure.

[0157] Aspect 13: According to the method of aspect 12, wherein when the value of the power satisfies a threshold value, the number of repetitions of the msg3 communication is a first number of repetitions of the msg3 communication, and when the value of the power does not satisfy the threshold value, the number of repetitions of the msg3 communication is a second number of repetitions of the msg3 communication.

[0158] Aspect 14: According to the method of aspect 1, wherein the uplink control information (UCI) is multiplexed with the msg3 communication, the UCI indicating at least one of the following: the number of repetitions of the msg3 communication, downlink quality measurement, or power margin report.

[0159] Aspect 15: The method according to any one of Aspect 1 or 14 further includes: receiving an indication of a beta factor to be used for determining uplink control information (UCI) resources.

[0160] Aspect 16: The method according to aspect 15, wherein the indication is received in at least one of the following: one or more bits of downlink control information (DCI) of message 2 communication scheduling the four-step RACH process, one or more bits or one or more fields of downlink control information (DCI) of msg3 communication scheduling the msg3 process, or a system information message associated with RACH configuration.

[0161] Aspect 17: The method according to any one of Aspects 1-16, wherein the repetition of the msg3 communication is a repetition of the Physical Uplink Shared Channel (PUSCH) carrying msg3.

[0162] Aspect 18: A method of wireless communication performed by a base station, comprising: sending a message 2 (msg2) communication of a four-step random access channel (RACH) procedure to a user equipment (UE); and receiving a repetition of a message 3 (msg3) communication of the four-step RACH procedure from the UE.

[0163] Aspect 19: The method according to aspect 18 further includes: transmitting a physical downlink control channel (PDCCH) using an aggregation level based at least in part on the number of repetitions used for the msg3 communication.

[0164] Aspect 20: The method according to aspect 19, wherein the PDCCH carries downlink control information (DCI) for scheduling the msg2 communication.

[0165] Aspect 21: According to the method of aspect 20, wherein the msg3 communication is an initial transmission or a retransmission.

[0166] Aspect 22: The method according to aspect 19, wherein the PDCCH carries downlink control information (DCI) for scheduling the msg3 communication.

[0167] Aspect 23: According to the method of aspect 22, wherein the msg3 communication is a retransmission.

[0168] Aspect 24: The method according to any one of Aspects 19-23, wherein when the aggregation level is a first aggregation level, the number of repetitions of the msg3 communication is a first number of repetitions of the msg3 communication, and when the aggregation level is a second aggregation level, the number of repetitions of the msg3 communication is a second number of repetitions of the msg3 communication.

[0169] Aspect 25: The method according to any one of Aspects 19-23, wherein when the aggregation level meets a threshold value, the number of repetitions of the msg3 communication is a first number of repetitions of the msg3 communication, and when the aggregation level does not meet the threshold value, the number of repetitions of the msg3 communication is a second number of repetitions of the msg3 communication.

[0170] Aspect 26: The method according to any one of Aspects 18-25, wherein the number of repetitions of the msg3 communication is based at least in part on the physical RACH of the Message 1 communication carrying the four-step RACH process measured by the base station.

[0171] Aspect 27: The method according to any one of aspects 18-26 further includes: receiving message 1 (msg1) communication of the four-step RACH process, the msg1 communication indicating the number of repetitions of the msg3 communication.

[0172] Aspect 28: The method according to aspect 27, wherein when the msg1 communication is associated with a first msg1 communication group, the msg1 communication indicates the first number of repetitions of the msg3 communication, and when the msg1 communication is associated with a second msg1 communication group, the msg1 communication indicates the second number of repetitions of the msg3 communication.

[0173] Aspect 29: The method according to any one of Aspects 18-25, wherein the number of repetitions of the msg3 communication is at least partially based on the power of the Message 1 communication used by the UE to transmit the four-step RACH procedure.

[0174] Aspect 30: According to the method of aspect 29, wherein when the power value meets a threshold value, the number of repetitions of the msg3 communication is a first number of repetitions of the msg3 communication, and when the power value does not meet the threshold value, the number of repetitions of the msg3 communication is a second number of repetitions of the msg3 communication.

[0175] Aspect 31: According to the method of aspect 18, wherein the uplink control information (UCI) is multiplexed with the msg3 communication, the UCI indicating at least one of the following: the number of repetitions of the msg3 communication, downlink quality measurement, or power margin report.

[0176] Aspect 32: The method according to any one of aspects 18 or 31 further includes: sending an indication of a beta factor to be used for uplink control information (UCI) resource determination.

[0177] Aspect 33: The method according to aspect 32, wherein the indication is sent in at least one of the following: one or more bits of downlink control information (DCI) scheduling the msg2 communication, one or more bits or one or more fields of downlink control information (DCI) scheduling the msg3 communication, or a system information message associated with RACH configuration.

[0178] Aspect 34: The method according to any one of Aspects 18-33, wherein the repetition of the msg3 communication is a repetition of the Physical Uplink Shared Channel (PUSCH) carrying msg3.

[0179] Aspect 35: An apparatus for wireless communication at a user equipment, 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 the method according to one or more of aspects 1-17.

[0180] Aspect 36: A user equipment for wireless communication, comprising a memory and one or more processors coupled to the memory, the memory and the one or more processors being configured to perform the method according to one or more of aspects 1-17.

[0181] Aspect 37: An apparatus for wireless communication at a user equipment, comprising at least one unit for performing the method according to one or more of aspects 1-17.

[0182] Aspect 38: A non-transitory computer-readable medium storing code for wireless communication, said code including instructions executable by a processor to perform the methods described in accordance with one or more of aspects 1-17.

[0183] Aspect 39: A non-transitory computer-readable medium storing a set of instructions for wireless communication, the set of instructions comprising one or more instructions which, when executed by one or more processors of a user equipment, cause the user equipment to perform the method according to one or more aspects of aspects 1-17.

[0184] Aspect 40: An apparatus for wireless communication at a base station, 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 the method according to one or more of aspects 18-34.

[0185] Aspect 41: A base station for wireless communication, comprising a memory and one or more processors coupled to the memory, the memory and the one or more processors being configured to perform the method according to one or more aspects of aspects 18-34.

[0186] Aspect 42: An apparatus for wireless communication at a base station, comprising at least one unit for performing the method according to one or more of aspects 18-34.

[0187] Aspect 43: A non-transitory computer-readable medium storing code for wireless communication, said code including instructions executable by a processor to perform the methods described in one or more of aspects 18-34.

[0188] Aspect 44: A non-transitory computer-readable medium storing a set of instructions for wireless communication, the set of instructions comprising one or more instructions, which, when executed by one or more processors of a base station, cause the user equipment to perform the method according to one or more aspects of aspects 18-34.

[0189] The foregoing disclosure provides explanations and descriptions, but is not intended to be exhaustive or to limit the aspects to the precise form disclosed. Modifications and variations may be made based on the foregoing disclosure, or modifications and variations may be derived from practice in the aspects.

[0190] As used herein, the term "component" is intended to be interpreted broadly as hardware and / or a combination of hardware and software. Whether referred to as software, firmware, middleware, microcode, hardware description language, or other names, "software" should be interpreted broadly as instructions, instruction sets, code, code segments, program code, programs, subroutines, software modules, applications, software applications, software packages, routines, subroutines, objects, executable files, threads of execution, procedures and / or functions, and other examples. As used herein, processors are implemented using hardware and / or a combination of hardware and software. It will be apparent that the systems and / or methods described herein can be implemented using various forms of hardware and / or combinations of hardware and software. The actual specialized control hardware or software code used to implement these systems and / or methods is not a limitation in any respect. Therefore, while the operation and behavior of systems and / or methods are described herein without reference to specific software code, it is to be understood that software and hardware can be designed to implement systems and / or methods, at least in part, based on the descriptions herein.

[0191] As used in this article, depending on the context, satisfying the threshold can refer to a value 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.

[0192] Even if a specific combination of features is recited in the claims and / or disclosed in the specification, such combinations are not intended to limit the disclosure of the aspects. In fact, many of these features can be combined in ways that are not specifically recited in the claims and / or specifically disclosed in the specification. While each dependent claim listed below may directly depend on only one claim, the disclosure of an aspect includes a combination of each dependent claim with every other claim in the claim set. As used herein, the phrase “at least one of” in the list of items refers to any combination of those items, including single members. For example, “at least one of a, b, or c” is intended to cover a, b, c, ab, ac, bc, and abc, as well as any combination of multiples of the same element (e.g., aa, aaa, aab, aac, abb, acc, bb, bbb, bbc, cc, and ccc, or any other ordering of a, b, and c).

[0193] None of the elements, actions, or instructions used herein should be construed as critical or necessary unless explicitly stated otherwise. Furthermore, as used herein, the articles “a” and “an” are intended to include one or more items and are interchangeable with “one or more.” Furthermore, as used herein, the article “the” is intended to include one or more items referenced in combination with the article “the” and is interchangeable with “one or more.” Furthermore, as used herein, the terms “set” and “group” are intended to include one or more items (e.g., related items, unrelated items, or a combination of related and unrelated items) and are interchangeable with “one or more.” Where only one item is anticipated, the phrase “only one” or similar language is used. Furthermore, as used herein, the terms “has,” “have,” “having,” etc., are intended to be open-ended terms. Furthermore, unless explicitly stated otherwise, the phrase “based on” is intended to mean “at least partially based on.” Furthermore, as used herein, the term “or” is intended to be inclusive when used in a series and may be used interchangeably with “and / or” unless otherwise expressly stated (e.g., if used in conjunction with “any” or “only one of”).

Claims

1. A method for wireless communication performed by a user equipment (UE), comprising: The number of repetitions of message 3 (msg3) communication to be sent to the base station in the four-step random access channel (RACH) procedure is determined at least in part based on the aggregation level associated with the physical downlink control channel (PDCCH). as well as The number of repetitions of the msg3 communication is sent to the base station based at least in part on determining the number of repetitions of the msg3 communication.

2. The method according to claim 1, wherein, The PDCCH carries downlink control information (DCI) for the communication of message 2, which schedules the four-step RACH process.

3. The method according to claim 2, wherein, The msg3 communication is either an initial transmission or a retransmission.

4. The method according to claim 1, wherein, The PDCCH carries downlink control information (DCI) for scheduling the msg3 communication.

5. The method according to claim 4, wherein, The msg3 communication is a retransmission.

6. The method according to claim 1, wherein, When the aggregation level is a first aggregation level, the number of repetitions of the msg3 communication is determined as a first number of repetitions of the msg3 communication, and when the aggregation level is a second aggregation level, the number of repetitions of the msg3 communication is determined as a second number of repetitions of the msg3 communication.

7. The method according to claim 1, wherein, When the aggregation level meets the threshold, the number of repetitions of the msg3 communication is determined as a first number of repetitions of the msg3 communication, and when the aggregation level does not meet the threshold, the number of repetitions of the msg3 communication is determined as a second number of repetitions of the msg3 communication.

8. The method according to claim 1, wherein, The number of repetitions of the msg3 communication is based at least in part on a measurement of the physical RACH of the message 1 communication carrying the four-step RACH process.

9. The method according to claim 1, further comprising: Send message 1 (msg1) communication of the four-step RACH process, the msg1 communication indicating the number of repetitions of the msg3 communication.

10. The method according to claim 1, wherein, The uplink control information (UCI) is multiplexed with msg3, and the UCI indicates at least one of the following: The number of repetitions in the msg3 communication. Downlink quality measurement, or Power margin report.

11. The method according to claim 1, further comprising: Receive an indication of the beta factor to be used for uplink control information (UCI) resource determination.

12. The method according to claim 11, wherein, The instruction is received in at least one of the following: One or more bits of downlink control information (DCI) in message 2 communication that schedules the four-step RACH process. One or more bits or fields of the downlink control information (DCI) that schedules the msg3 communication, or System information messages associated with RACH configuration.

13. The method according to claim 1, wherein, The number of repetitions in the msg3 communication is the number of repetitions of the Physical Uplink Shared Channel (PUSCH) carrying msg3.

14. A method for wireless communication performed by a base station, comprising: In the Physical Downlink Control Channel (PDCCH), message 2 (msg2) is sent to the User Equipment (UE) to communicate the four-step Random Access Channel (RACH) procedure; as well as The UE receives repeats of message 3 (msg3) communication in the four-step RACH process, wherein the number of repeats of the msg3 communication is at least in part based on the aggregation level associated with the PDCCH.

15. The method according to claim 14, wherein, The PDCCH carries downlink control information (DCI) for scheduling the msg2 communication.

16. The method according to claim 15, wherein, The msg3 communication is either an initial transmission or a retransmission.

17. The method of claim 14, wherein, The PDCCH carries downlink control information (DCI) for scheduling the msg3 communication.

18. The method according to claim 17, wherein, The msg3 communication is a retransmission.

19. The method of claim 14, wherein, When the aggregation level is a first aggregation level, the number of repetitions in the msg3 communication is a first number of repetitions in the msg3 communication, and when the aggregation level is a second aggregation level, the number of repetitions in the msg3 communication is a second number of repetitions in the msg3 communication.

20. The method of claim 14, wherein, When the aggregation level meets the threshold, the number of repetitions in the msg3 communication is a first number of repetitions in the msg3 communication, and when the aggregation level does not meet the threshold, the number of repetitions in the msg3 communication is a second number of repetitions in the msg3 communication.

21. The method according to claim 14, wherein, The number of repetitions of the msg3 communication is at least in part based on the base station's measurement of the physical RACH of the Message 1 communication carrying the four-step RACH process.

22. The method of claim 14, further comprising: Receive message 1 (msg1) communication of the four-step RACH process, the msg1 communication indicating the number of repetitions of the msg3 communication.

23. The method according to claim 14, wherein, The uplink control information (UCI) is multiplexed with msg3, and the UCI indicates at least one of the following: The number of repetitions in the msg3 communication. Downlink quality measurement, or Power margin report.

24. The method of claim 14, further comprising: Send an indication of the beta factor to be used for uplink control information (UCI) resource determination.

25. The method according to claim 24, wherein, The instruction is sent in at least one of the following: Schedule one or more bits of the downlink control information (DCI) of the msg2 communication. One or more bits or fields of the downlink control information (DCI) that schedules the msg3 communication, or System information messages associated with RACH configuration.

26. The method according to claim 14, wherein, The repetition of the msg3 communication is a repetition of the Physical Uplink Shared Channel (PUSCH) carrying msg3.

27. A user equipment (UE) for wireless communication, comprising: Memory; as well as One or more processors coupled to the memory, the one or more processors being configured to: The number of repetitions of message 3 (msg3) communication to be sent to the base station in the four-step random access channel (RACH) procedure is determined at least in part based on the aggregation level associated with the physical downlink control channel (PDCCH). as well as The number of repetitions of the msg3 communication is sent to the base station based at least in part on determining the number of repetitions of the msg3 communication.

28. The UE according to claim 27, wherein, The PDCCH carries downlink control information for Message 2 communication that schedules the four-step RACH process.

29. The UE according to claim 28, wherein, The msg3 communication is either an initial transmission or a retransmission.

30. The UE according to claim 27, wherein, The PDCCH carries downlink control information for scheduling the msg3 communication.

31. The UE according to claim 30, wherein, The msg3 communication is a retransmission.

32. The UE according to claim 27, wherein, When the aggregation level is a first aggregation level, the number of repetitions of the msg3 communication is determined as a first number of repetitions of the msg3 communication, and when the aggregation level is a second aggregation level, the number of repetitions of the msg3 communication is determined as a second number of repetitions of the msg3 communication.

33. The UE according to claim 27, wherein, When the aggregation level meets the threshold, the number of repetitions of the msg3 communication is determined as a first number of repetitions of the msg3 communication, and when the aggregation level does not meet the threshold, the number of repetitions of the msg3 communication is determined as a second number of repetitions of the msg3 communication.

34. The UE according to claim 27, wherein, The number of repetitions of the msg3 communication is based at least in part on a measurement of the physical RACH of the message 1 communication carrying the four-step RACH process.

35. The UE according to claim 27, wherein, The one or more processors are further configured to: Send message 1 (msg1) communication of the four-step RACH process, the msg1 communication indicating the number of repetitions of the msg3 communication.

36. The UE according to claim 27, wherein, The uplink control information (UCI) is multiplexed with msg3, and the UCI indicates at least one of the following: The number of repetitions in the msg3 communication. Downlink quality measurement, or Power margin report.

37. The UE according to claim 27, wherein, The one or more processors are further configured to: Receive an indication of the beta factor to be used for uplink control information (UCI) resource determination.

38. The UE according to claim 37, wherein, The instruction is received in at least one of the following: One or more bits of downlink control information (DCI) in message 2 communication that schedules the four-step RACH process. One or more bits or fields of the downlink control information (DCI) that schedules the msg3 communication, or System information messages associated with RACH configuration.

39. The UE according to claim 27, wherein, The repetition of the msg3 communication is a repetition of the Physical Uplink Shared Channel (PUSCH) carrying msg3.

40. A base station for wireless communication, comprising: Memory; as well as One or more processors coupled to the memory, the one or more processors being configured to: In the Physical Downlink Control Channel (PDCCH), message 2 (msg2) is sent to the User Equipment (UE) to communicate the four-step Random Access Channel (RACH) procedure; as well as The UE receives repeats of message 3 (msg3) communication in the four-step RACH process, wherein the number of repeats of the msg3 communication is at least in part based on the aggregation level associated with the PDCCH.

41. The base station according to claim 40, wherein, The PDCCH carries downlink control information (DCI) for scheduling the msg2 communication.

42. The base station according to claim 41, wherein, The msg3 communication is either an initial transmission or a retransmission.

43. The base station according to claim 40, wherein, The PDCCH carries downlink control information (DCI) for scheduling the msg3 communication.

44. The base station according to claim 43, wherein, The msg3 communication is a retransmission.

45. The base station according to claim 40, wherein, When the aggregation level is a first aggregation level, the number of repetitions in the msg3 communication is a first number of repetitions in the msg3 communication, and when the aggregation level is a second aggregation level, the number of repetitions in the msg3 communication is a second number of repetitions in the msg3 communication.

46. ​​The base station according to claim 40, wherein, When the aggregation level meets the threshold, the number of repetitions in the msg3 communication is a first number of repetitions in the msg3 communication, and when the aggregation level does not meet the threshold, the number of repetitions in the msg3 communication is a second number of repetitions in the msg3 communication.

47. The base station according to claim 40, wherein, The number of repetitions of the msg3 communication is at least in part based on the base station's measurement of the physical RACH of the Message 1 communication carrying the four-step RACH process.

48. The base station according to claim 40, wherein, The one or more processors are further configured to: Receive message 1 (msg1) communication of the four-step RACH process, the msg1 communication indicating the number of repetitions of the msg3 communication.

49. The base station according to claim 40, wherein, The uplink control information (UCI) is multiplexed with msg3, and the UCI indicates at least one of the following: The number of repetitions in the msg3 communication. Downlink quality measurement, or Power margin report.

50. The base station according to claim 40, wherein, The one or more processors are further configured to: Send an indication of the beta factor to be used for uplink control information (UCI) resource determination.

51. The base station according to claim 50, wherein, The instruction is sent in at least one of the following: Schedule one or more bits of the downlink control information (DCI) of the msg2 communication. One or more bits or fields of the downlink control information (DCI) that schedules the msg3 communication, or System information messages associated with RACH configuration.

52. The base station according to claim 40, wherein, The repetition of the msg3 communication is a repetition of the Physical Uplink Shared Channel (PUSCH) carrying msg3.

53. An apparatus for wireless communication at a user equipment, comprising: A unit for determining the number of repetitions of message 3 (msg3) communication to be sent to the base station in a four-step random access channel (RACH) procedure, based at least in part on the aggregation level associated with the physical downlink control channel (PDCCH). as well as A unit for sending the number of repetitions of the msg3 communication to the base station based at least in part on determining the number of repetitions of the msg3 communication.

54. The apparatus according to claim 53, wherein, The PDCCH carries downlink control information (DCI) for the communication of message 2, which schedules the four-step RACH process.

55. The apparatus according to claim 54, wherein, The msg3 communication is either an initial transmission or a retransmission.

56. The apparatus according to claim 53, wherein, The PDCCH carries downlink control information (DCI) for scheduling the msg3 communication.

57. The apparatus according to claim 56, wherein, The msg3 communication is a retransmission.

58. The apparatus according to claim 53, wherein, When the aggregation level is a first aggregation level, the number of repetitions of the msg3 communication is determined as a first number of repetitions of the msg3 communication, and when the aggregation level is a second aggregation level, the number of repetitions of the msg3 communication is determined as a second number of repetitions of the msg3 communication.

59. The apparatus according to claim 53, wherein, When the aggregation level meets the threshold, the number of repetitions of the msg3 communication is determined as a first number of repetitions of the msg3 communication, and when the aggregation level does not meet the threshold, the number of repetitions of the msg3 communication is determined as a second number of repetitions of the msg3 communication.

60. The apparatus according to claim 53, wherein, The uplink control information (UCI) is multiplexed with msg3, and the UCI indicates at least one of the following: The number of repetitions in the msg3 communication. Downlink quality measurement, or Power margin report.

61. The apparatus of claim 53, further comprising: A unit for receiving an indication of the beta factor to be used for determining uplink control information (UCI) resources.

62. The apparatus according to claim 61, wherein, The instruction is received in at least one of the following: One or more bits of downlink control information (DCI) in message 2 communication that schedules the four-step RACH process. One or more bits or fields of the downlink control information (DCI) that schedules the msg3 communication, or System information messages associated with RACH configuration.

63. The apparatus according to claim 53, wherein, The repetition of the msg3 communication is a repetition of the Physical Uplink Shared Channel (PUSCH) carrying msg3.

64. An apparatus for wireless communication at a base station, comprising: A unit for communicating message 2 (msg2) in the Physical Downlink Control Channel (PDCCH) and to the User Equipment (UE) to send the four-step Random Access Channel (RACH) procedure; as well as A unit for receiving repeated message 3 (msg3) communications from the UE in the four-step RACH process, wherein the number of repeated msg3 communications is at least partially based on the aggregation level associated with the PDCCH.

65. The apparatus according to claim 64, wherein, The PDCCH carries downlink control information (DCI) for scheduling the msg2 communication.

66. The apparatus according to claim 65, wherein, The msg3 communication is either an initial transmission or a retransmission.

67. The apparatus according to claim 64, wherein, The PDCCH carries downlink control information (DCI) for scheduling the msg3 communication.

68. The apparatus according to claim 67, wherein, The msg3 communication is a retransmission.

69. The apparatus according to claim 64, wherein, When the aggregation level is a first aggregation level, the number of repetitions in the msg3 communication is a first number of repetitions in the msg3 communication, and when the aggregation level is a second aggregation level, the number of repetitions in the msg3 communication is a second number of repetitions in the msg3 communication.

70. The apparatus according to claim 64, wherein, When the aggregation level meets the threshold, the number of repetitions in the msg3 communication is a first number of repetitions in the msg3 communication, and when the aggregation level does not meet the threshold, the number of repetitions in the msg3 communication is a second number of repetitions in the msg3 communication.

71. The apparatus according to claim 64, wherein, The uplink control information (UCI) is multiplexed with msg3, and the UCI indicates at least one of the following: The number of repetitions in the msg3 communication. Downlink quality measurement, or Power margin report.

72. The apparatus of claim 64, further comprising: A unit used to send an indication of the beta factor to be used for uplink control information (UCI) resource determination.

73. The apparatus according to claim 72, wherein, The instruction is sent in at least one of the following: Schedule one or more bits of the downlink control information (DCI) of the msg2 communication. One or more bits or fields of the downlink control information (DCI) that schedules the msg3 communication, or System information messages associated with RACH configuration.

74. The apparatus according to claim 64, wherein, The repetition of the msg3 communication is a repetition of the Physical Uplink Shared Channel (PUSCH) carrying msg3.

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