Power RAMP-up for physical random access channel transmissions
Patent Information
- Application Number
- PCT/CN2025/085260
- Authority / Receiving Office
- WO · WO
- Patent Type
- Applications
- Current Assignee / Owner
- Filing Date
- 2025-03-27
- Publication Date
- 2026-10-01
Smart Images

Figure CN2025085260_01102026_PF_FP_ABST
Abstract
Description
POWER RAMP-UP FOR PHYSICAL RANDOM ACCESS CHANNEL TRANSMISSIONSFIELD OF THE DISCLOSURE
[0001] Aspects of the present disclosure generally relate to wireless communication and specifically relate to techniques, apparatuses, and methods associated with power ramp up for physical random access channel transmissions. DESCRIPTION OF THE RELATED TECHNOLOGY
[0002] Wireless communication systems are widely deployed to provide various services, which may involve carrying or supporting voice, text, other messaging, video, data, or other traffic. Typical wireless communication systems may employ multiple-access radio access technologies (RATs) capable of supporting communication among multiple wireless communication devices including user devices or other devices by sharing the available system resources (for example, time domain resources, frequency domain resources, spatial domain resources, or device transmit power, among other examples) . Such multiple-access RATs are supported by technological advancements that have been adopted in various telecommunication standards, which define common protocols that enable different wireless communication devices to communicate on a local, municipal, national, regional, or global level. An example telecommunication standard is New Radio (NR) . NR, which also may be referred to as 5G, is part of a continuous mobile broadband evolution promulgated by the Third Generation Partnership Project (3GPP) . As the demand for connectivity continues to increase, further improvements in NR may be implemented, and other RATs, such as 6G and beyond, may be introduced to enable new applications and facilitate new use cases.
[0003] In some cases, a wireless communication device may transmit a communication to another wireless communication device. In some cases, the wireless communication device may monitor for a response message from the other wireless communication device based at least in part on transmitting the communication. In some cases, the wireless communication device may determine that the response message was not successfully received by the wireless communication device. In these cases, the wireless communication device may retransmit the communication to the other wireless communication device based at least in part on the response message not being successfully received by the wireless communication device.SUMMARY
[0004] Some aspects described herein relate to a method of wireless communication performed by a user equipment (UE) . The method may include receiving a physical downlink control channel (PDCCH) order associated with a physical random access channel (PRACH) communication, wherein the PDCCH order includes downlink control information (DCI) with a 1-bit indicator, wherein the DCI indicates a synchronization signal block (SSB) and a preamble index. The method may include performing a first transmission of the PRACH communication based at least in part on the SSB, the preamble index, and the 1-bit indicator. The method may include performing a second transmission of the PRACH communication based at least in part on the SSB, the preamble index, and the 1-bit indicator, and based at least in part on determining that the PRACH communication was not successfully received.
[0005] Some aspects described herein relate to a method of wireless communication performed by a network node. The method may include transmitting a PDCCH order associated with a PRACH communication, wherein the PDCCH order includes DCI with a 1-bit indicator, wherein the DCI indicates an SSB and a preamble index. The method may include receiving a transmission of the PRACH communication based at least in part on the SSB, the preamble index, and the 1-bit indicator, wherein the transmission of the PRACH communication comprises a second transmission of the PRACH communication that is transmitted based at least in part on the SSB, the preamble index, and the 1-bit indicator and based at least in part on determining that a first transmission of the PRACH communication was not successfully received by the network node, and wherein the second transmission of the PRACH communication is performed without transmitting a PDCCH order associated with the second transmission of the PRACH communication.
[0006] Some aspects described herein relate to a non-transitory computer-readable medium that stores a set of instructions for wireless communication by a UE. The set of instructions, when executed by one or more processors of the UE, may cause the UE to receive a PDCCH order associated with a PRACH communication, wherein the PDCCH order includes DCI with a 1-bit indicator, wherein the DCI indicates an SSB and a preamble index. The set of instructions, when executed by one or more processors of the UE, may cause the UE to perform a first transmission of the PRACH communication based at least in part on the SSB, the preamble index, and the 1-bit indicator. The set of instructions, when executed by one or more processors of the UE, may cause the UE to perform a second transmission of the PRACH communication based at least in part on the SSB, the preamble index, and the 1-bit indicator, and based at least in part on determining that the PRACH communication was not successfully received.
[0007] Some aspects described herein relate to a non-transitory computer-readable medium that stores a set of instructions for wireless communication by a network node. The set of instructions, when executed by one or more processors of the network node, may cause the network node to transmit a PDCCH order associated with a PRACH communication, wherein the PDCCH order includes DCI with a 1-bit indicator, wherein the DCI indicates an SSB and a preamble index. The set of instructions, when executed by one or more processors of the network node, may cause the network node to receive a transmission of the PRACH communication based at least in part on the SSB, the preamble index, and the 1-bit indicator, wherein the transmission of the PRACH communication comprises a second transmission of the PRACH communication that is transmitted based at least in part on the SSB, the preamble index, and the 1-bit indicator and based at least in part on determining that a first transmission of the PRACH communication was not successfully received by the network node, and wherein the second transmission of the PRACH communication is performed without transmitting a PDCCH order associated with the second transmission of the PRACH communication.
[0008] Some aspects described herein relate to a UE. The UE may include a processing system. The processing system may include one or more processors and one or more code-storing memories coupled with the one or more processors. The processing system may be configured to cause the UE to receive a PDCCH order associated with a PRACH communication, wherein the PDCCH order includes DCI with a 1-bit indicator, wherein the DCI indicates an SSB and a preamble index. The processing system may be configured to cause the UE to perform a first transmission of the PRACH communication based at least in part on the SSB, the preamble index, and the 1-bit indicator. The processing system may be configured to cause the UE to perform a second transmission of the PRACH communication based at least in part on the SSB, the preamble index, and the 1-bit indicator, and based at least in part on determining that the PRACH communication was not successfully received.
[0009] Some aspects described herein relate to a network node. The network node may include a processing system. The processing system may include one or more processors and one or more code-storing memories coupled with the one or more processors. The processing system may be configured to cause the network node to transmit a PDCCH order associated with a PRACH communication, wherein the PDCCH order includes DCI with a 1-bit indicator, wherein the DCI indicates an SSB and a preamble index. The processing system may be configured to cause the network node to receive a transmission of the PRACH communication based at least in part on the SSB, the preamble index, and the 1-bit indicator, wherein the transmission of the PRACH communication comprises a second transmission of the PRACH communication that is transmitted based at least in part on the SSB, the preamble index, and the 1-bit indicator and based at least in part on determining that a first transmission of the PRACH communication was not successfully received by the network node, and wherein the second transmission of the PRACH communication is performed without transmitting a PDCCH order associated with the second transmission of the PRACH communication.
[0010] Some aspects described herein relate to an apparatus for wireless communication. The apparatus may include means for receiving a PDCCH order associated with a PRACH communication, wherein the PDCCH order includes DCI with a 1-bit indicator, wherein the DCI indicates an SSB and a preamble index. The apparatus may include means for performing a first transmission of the PRACH communication based at least in part on the SSB, the preamble index, and the 1-bit indicator. The apparatus may include means for performing a second transmission of the PRACH communication based at least in part on the SSB, the preamble index, and the 1-bit indicator, and based at least in part on determining that the PRACH communication was not successfully received.
[0011] Some aspects described herein relate to an apparatus for wireless communication. The apparatus may include means for transmitting a PDCCH order associated with a PRACH communication, wherein the PDCCH order includes DCI with a 1-bit indicator, wherein the DCI indicates an SSB and a preamble index. The apparatus may include means for receiving a transmission of the PRACH communication based at least in part on the SSB, the preamble index, and the 1-bit indicator, wherein the transmission of the PRACH communication comprises a second transmission of the PRACH communication that is transmitted based at least in part on the SSB, the preamble index, and the 1-bit indicator and based at least in part on determining that a first transmission of the PRACH communication was not successfully received by the network node, and wherein the second transmission of the PRACH communication is performed without transmitting a PDCCH order associated with the second transmission of the PRACH communication.
[0012] The systems, methods, and devices of this disclosure each have several innovative aspects, no single one of which is solely responsible for the desirable attributes disclosed herein.
[0013] Aspects of the present disclosure may generally be implemented by or as a method, apparatus, system, computer program product, non-transitory computer-readable medium, user equipment, network node, wireless communication device, or processing system as substantially described in the Detailed Description with reference to, and as illustrated by, the accompanying drawings. Details of one or more implementations of the subject matter described in this disclosure are set forth in the accompanying drawings and the description below. Other features, aspects, and advantages will become apparent from the description, the drawings, and the claims. Note that the relative dimensions of the following figures may not be drawn to scale.BRIEF DESCRIPTION OF THE DRAWINGS
[0014] Fig. 1 is a diagram illustrating an example of a wireless communication network.
[0015] Fig. 2 is a diagram illustrating an example of a two-step random access procedure.
[0016] Fig. 3 is a diagram illustrating an example of a four-step random access procedure.
[0017] Fig. 4 is a diagram illustrating an example of an asymmetric downlink and uplink deployment.
[0018] Figs. 5A and 5B are diagrams illustrating a first example and a second example, respectively, of a physical downlink control channel order that is associated with triggering a random access channel procedure.
[0019] Fig. 6 is a diagram of an example associated with power ramp-up for physical random access channel transmissions.
[0020] Fig. 7 is a diagram illustrating an example process performed, for example, at a user equipment (UE) or an apparatus of a UE.
[0021] Fig. 8 is a diagram illustrating an example process performed, for example, at a network node or an apparatus of a network node.
[0022] Fig. 9 is a diagram of an example apparatus for wireless communication.
[0023] Fig. 10 is a diagram of an example apparatus for wireless communication.DETAILED DESCRIPTION
[0024] In wireless communication systems, a physical downlink control channel (PDCCH) and a physical random access channel (PRACH) are components for managing uplink and downlink transmissions between user equipment (UE) and network nodes. The PDCCH may be used for scheduling downlink and uplink resources by conveying downlink control information (DCI) to the UE, while the PRACH may be used by the UE to initiate a connection with the network node, typically for random access procedures or obtaining TA for UL synchronization.
[0025] In scenarios involving an uplink dense deployment (also referred to herein as an asymmetric downlink and uplink deployment) , where the downlink and uplink transmissions may occur over different transmission / reception points (TRPs) , the management of these channels may become more complex. Specifically, for PRACH retransmissions ordered by a PDCCH order, it may be necessary to consider factors such as the selected beamforming states and path loss offsets associated with the indicated transmission configuration indicator (TCI) states. These parameters may impact the transmission power and success rate of the PRACH transmission, necessitating coordination and signaling between the UE and the network node to optimize performance and ensure reliable communication.
[0026] To address this, a 1-bit DCI field may be included in the PDCCH order DCI to indicate whether the path loss offset associated with the indicated TCI state is included in the PRACH transmission power calculation. In some cases, the 1-bit DCI field may be included in the PDCCH order DCI when a corresponding radio resource control (RRC) parameter used to configure the presence of the 1-bit DCI field in the PDCCH order is enabled and at least one TCI state is configured with a path loss offset.
[0027] In some cases, there is one indicated joint or uplink TCI state (which is indicated via a beam indication DCI) . In these cases, the 1-bit DCI field may be set to a first value (e.g., 0) to indicate that the path loss offset is not included in the PRACH transmission power calculation and may be set to a second value (e.g., 1) to indicate that the path loss offset is included in the PRACH transmission power calculation.
[0028] In some cases, there may be two indicated joint or uplink TCI states (which are indicated via a beam indication DCI) . In these cases, the 1-bit DCI field may be set to a first value (e.g., 0) to indicate that the path loss offset associated with the first joint or uplink TCI state is included in the PRACH transmission power calculation and may be set to a second value (e.g., 1) to indicate that the path loss offset associated with the second joint or uplink TCI state is included in the PRACH transmission power calculation.
[0029] In some cases, a UE may need to perform a retransmission of a PRACH communication. For example, a UE may need to perform a retransmission of a PRACH communication based at least in part on a network node failing to successfully receive an initial transmission of the PRACH communication. In these cases, the UE may autonomously (e.g., without waiting to receive another PDCCH order) retransmit the PRACH communication. In some cases, the UE may retransmit the PRACH communication with power ramp-up (e.g., increment a preamble power ramping counter by 1 to cause the retransmission of the PRACH communication to be transmitted at a higher power relative to the initial transmission of the PRACH communication) . For example, the UE may retransmit the PRACH communication with power ramp-up if the spatial domain transmission filter for PRACH communication is not changed and if a selected synchronization signal block (SSB) or channel state information reference signal (CSI-RS) is not changed from the SSB or CSI-RS selected for the transmission of the previous random access preamble transmission.
[0030] However, in cases where there is one indicated joint / UL TCI state and a 1-bit DCI field is included in the PDCCH order DCI to indicate whether the path loss offset associated with the indicated joint / UL TCI state is included in the PRACH transmission power calculation, the UE may be unable to determine whether the UE is to follow the indicated joint or uplink TCI state for the retransmission of the PRACH communication. Further, in some cases the indicated joint or uplink TCI state may change prior to the retransmission of the PRACH communication. In these cases, the UE may be unable to determine whether the UE is to perform a retransmission or an initial transmission of the PRACH communication.
[0031] Without knowledge on whether the transmission of the PRACH communication is an initial PRACH transmission or a PRACH retransmission, the UE may use a transmission power level for transmitting a PRACH communication (or PRACH communication retransmission) that results in a candidate network node failing to receive the PRACH or the UE transmitting additional PRACH communication (re) transmissions that could have been mitigated with an appropriate transmission power level. The additional PRACH communication (re) transmissions may consume UE resources (e.g., battery power or computing resources) or air interface resources that could be used for other purposes and, as described above, may result in a shorter battery life at the UE, delayed communications by the UE for other applications, decreased data throughput in a wireless network, or increased data transfer latencies in the wireless network.
[0032] Various aspects relate generally to determining a transmission power level for a subsequent transmission of a PRACH communication (e.g., a second initial transmission of a PRACH communication or a retransmission of a PRACH) . Some aspects more specifically relate to performing a second transmission of a PRACH communication based at least in part on an SSB, a preamble index, and a 1-bit indicator indicated by DCI included in a PDCCH order associated with the PRACH communication. In some aspects, the 1-bit indicator indicates whether a PRACH transmission power calculation includes a path loss offset associated with a joint or uplink TCI state indicated in a beam indication DCI.
[0033] In some aspects, a UE may receive a beam indication DCI that indicates a first joint or uplink TCI state and a second joint or uplink TCI state. In some aspects, the 1-bit indicator is set to a first value to indicate that a first path loss offset associated with the first joint or uplink transmission TCI state is included in a PRACH transmission power calculation or that the first transmission of the PRACH communication is based at least in part on the first joint or uplink TCI state. In these aspects, a PRACH preamble power ramping counter may be incremented by one for the second transmission of the PRACH communication based at least in part on whether the first joint or uplink TCI state has changed.
[0034] In some aspects, the 1-bit indicator is set to a second value to indicate that a second path loss offset associated with the second joint or uplink transmission TCI state is included in the PRACH transmission power calculation or that the first transmission of the PRACH communication is based at least in part on the second joint or uplink TCI state. In these aspects, a PRACH preamble power ramping counter may be incremented by one for the second transmission of the PRACH communication based at least in part on whether the second joint or uplink TCI state has changed.
[0035] Particular aspects of the subject matter described in this disclosure can be implemented to realize one or more of the following potential advantages. In some examples, the described techniques can be used to determine a transmission power level for a subsequent transmission of a PRACH. Performing a subsequent transmission of a PRACH communication at an appropriate transmission power level for the subsequent transmission of the PRACH communication may decrease a likelihood that the UE will use a transmission power level for transmitting the PRACH communication that results in a network node failing to receive the PRACH communication or the UE transmitting additional PRACH communication (re) transmissions that could have been mitigated with an appropriate transmission power level.
[0036] By reducing the likelihood that the UE will use a transmission power level for transmitting the PRACH communication that results in a network node failing to receive the PRACH communication or the UE transmitting additional PRACH (re) transmissions that could have been mitigated with an appropriate transmission power level, the UE may conserve UE resources (e.g., battery power or computing resources, among other examples) or air interface resources that may otherwise be consumed by performing the additional PRACH communication (re) transmissions.
[0037] 5G New Radio (NR) may support enhanced mobile broadband (eMBB) access, Internet of Things (IoT) networks or reduced capability (RedCap) device deployments, ultra-reliable low-latency communication (URLLC) applications, or massive machine-type communication (mMTC) , among other examples. To support these and other target verticals, a wireless communication system may be designed to implement a modularized functional infrastructure, a disaggregated and service-based network architecture, network function virtualization, network slicing, multi-access edge computing, millimeter wave (mmWave) technologies including massive multiple-input multiple-output (MIMO) , beamforming, IoT device or RedCap device connectivity and management, industrial connectivity, licensed and unlicensed spectrum access, sidelink and other device-to-device direct communication (for example, cellular vehicle-to-everything (CV2X) communication) , frequency spectrum expansion, overlapping spectrum use, small cell deployments, non-terrestrial network (NTN) deployments, device aggregation, advanced duplex communication (for example, sub-band full-duplex (SBFD) ) , multiple-subscriber implementations, high-precision positioning, radio frequency (RF) sensing, network energy savings (NES) , low-power signaling and radios, or artificial intelligence or machine learning (AI / ML) , among other examples.
[0038] The foregoing and other technological improvements may support use cases, such as wireless fronthauls, wireless midhauls, wireless backhauls, wireless data centers, extended reality (XR) and metaverse applications, meta services for supporting vehicle connectivity, holographic and mixed reality communication, autonomous and collaborative robots, vehicle platooning and cooperative maneuvering, sensing networks, gesture monitoring, human-brain interfacing, digital twin applications, asset management, and universal coverage applications using non-terrestrial or aerial platforms, among other examples.
[0039] The methods, operations, apparatuses, and techniques described herein may enable one or more of the foregoing technologies or new technologies or support one or more of the foregoing use cases or new use cases.
[0040] Fig. 1 is a diagram illustrating an example of a wireless communication network 100. The wireless communication network 100 may be or may include elements of a 5G network or a 6G network, among other examples. The wireless communication network 100 may include multiple network nodes 110. For example, in Fig. 1, the wireless communication network 100 includes multiple network nodes 110, including a network node 110a and a network node 110b (each of which also may be referred to herein simply as a “network node 110” ) . The network nodes 110 may support communications with multiple UEs 120. For example, in Fig. 1, the network nodes 110 support communication with a UE 120a, a UE 120b, and a UE 120c (each of which also may be referred to herein simply as a “UE 120” ) . In some examples, a UE 120 also may communicate with other UEs 120 and a network node 110 also may communicate with a core network and with other network nodes 110.
[0041] The network nodes 110 and the UEs 120 of the wireless communication network 100 communicate using the electromagnetic spectrum, which may be subdivided into various licensed or unlicensed operating bands, frequency ranges, component carriers, or channels that define associated frequencies available for communications. In some examples, each of the network nodes 110 and the UEs 120 may communicate using one or multiple component carriers in one or more operating bands or ranges. Typically, various operating bands are defined as frequency range designations FR1 (410 MHz through 7.125 GHz) , FR2 (24.25 GHz through 52.6 GHz) , FR3 (7.125 GHz through 24.25 GHz) , FR4a or FR4-1 (52.6 GHz through 71 GHz) , FR4 (52.6 GHz through 114.25 GHz) , and FR5 (114.25 GHz through 300 GHz) . Although a portion of FR1 is greater than 6 GHz, FR1 is often referred to (interchangeably) as a “sub-6 GHz” band in some documents and articles. Similarly, FR2 is often referred to (interchangeably) as a “millimeter wave” band in some documents and articles.
[0042] A network node 110 or a UE 120 may include one or more devices, components, or systems that enable communication with other devices, components, or systems of the wireless communication network 100. For example, a UE 120 and a network node 110 may each include one or more chips, system-on-chips (SoCs) , chipsets, packages, or devices that individually or collectively constitute or comprise a processing system. As shown in Fig. 1, each UE 120 includes a processing system 140 and each network node 110 includes a processing system 145. A processing system (for example, the processing system 140 or the processing system 145) includes processor (or “processing” ) circuitry in the form of one or multiple processors, microprocessors, processing units (such as central processing units (CPUs) , graphics processing units (GPUs) , neural processing units (NPUs) (also referred to as neural network processors or deep learning processors (DLPs) ) , or digital signal processors (DSPs) ) , processing blocks, application-specific integrated circuits (ASICs) , programmable logic devices (PLDs) , or other discrete gate or transistor logic or circuitry (any one or more of which may be generally referred to herein individually as a “processor” or collectively as “the processor” or “the processor circuitry” ) . Such processors may be individually or collectively configurable or configured to perform various functions or operations described herein. A group of processors collectively configurable or configured to perform a set of functions may include a first processor configurable or configured to perform a first function of the set and a second processor configurable or configured to perform a second function of the set. In some other examples, each of a group of processors may be configurable or configured to perform a same set of functions.
[0043] The processing system 140 and the processing system 145 may each include memory circuitry in the form of one or multiple memory devices, memory blocks, memory elements, or other discrete gate or transistor logic or circuitry, each of which may include or implement tangible storage media, such as random-access memory, or read-only memory, or combinations thereof (any one or more of which may be generally referred to herein individually as a “memory” or collectively as “the memory” or “the memory circuitry” ) . One or more of the memories may be coupled (for example, operatively coupled, communicatively coupled, electronically coupled, or electrically coupled) with one or more of the processors. One or more of the memories may individually or collectively store processor-executable code or instructions (such as software) (for example, which may be referred to as “one or more code-storing memories” or “code-storing memory circuitry” ) . For example, “code-storing memory” or “code-storing memory circuitry” refers to memory (or memory circuitry) that is configured to store processor-executable code or instructions. The processor-executable code or instructions, when executed by one or more of the processors, may configure one or more of the processors (or processing circuitry) to perform various functions or operations described herein. Additionally, or alternatively, in some examples, one or more of the processors may be configured to perform various functions or operations described herein without requiring configuration by software. Software shall be construed broadly to mean instructions, instruction sets, code, code segments, program code, programs, subprograms, software modules, applications, software applications, software packages, routines, subroutines, objects, executables, threads of execution, procedures, or functions, among other examples, whether referred to as software, firmware, middleware, microcode, hardware description language, or otherwise.
[0044] The processing system 140 and the processing system 145 may each include or be coupled with one or more modems (such as a cellular (for example, a 5G or 6G compliant) modem) . In some examples, one or more processors of the processing system 140 or the processing system 145 may include or implement one or more of the modems. The processing system 140 and the processing system 145 also may include or be coupled with multiple radios (collectively “the radio” ) , multiple RF chains, or multiple transceivers, each of which may in turn be coupled with one or more of multiple antennas. In some examples, one or more processors of the processing system 140 or the processing system 145 may include or implement one or more of the radios, RF chains, or transceivers. An RF chain may include one or more filters, mixers, oscillators, amplifiers, analog-to-digital converters (ADCs) , or other devices that convert between an analog signal (such as for transmission or reception via an air interface) and a digital signal (such as for processing by the processing system 140 or by the processing system 145) .
[0045] A network node 110 and a UE 120 may each include one or multiple antennas or antenna arrays. Typical network nodes 110 and UEs 120 may include multiple antennas, which may be organized or structured into one or more antenna panels, one or more antenna groups, one or more sets of antenna elements, or one or more antenna arrays, among other examples. As used herein, the term “antenna” can refer to one or more antennas, one or more antenna panels, one or more antenna groups, one or more sets of antenna elements, or one or more antenna arrays. The term “antenna panel” can refer to a group of antennas (such as antenna elements) arranged in an array or panel, which may facilitate beamforming by manipulating parameters associated with the group of antennas. The term “antenna module” may refer to circuitry including one or more antennas as well as one or more other components (such as filters, amplifiers, or processors) associated with integrating the antenna module into a wireless communication device, such as the network node 110 and the UE 120.
[0046] A network node 110 may be, may include, or also may be referred to as an NR network node, a 5G network node, a 6G network node, a Node B, a gNB, an access point (AP) , a transmission reception point (TRP) , a network entity, a network element, a network equipment, or another type of device, component, or system included in a radio access network (RAN) . In various deployments, a network node 110 may be implemented as a single physical node (for example, a single physical structure) or may be implemented as two or more physical nodes (for example, two or more distinct physical structures) . For example, a network node 110 may be a device or system that implements a part of a radio protocol stack, a device or system that implements a full radio protocol stack (such as a full gNB protocol stack) , or a collection of devices or systems that collectively implement the full radio protocol stack. For example, and as shown, a network node 110 may be an aggregated network node having an aggregated architecture, meaning that the network node 110 may implement a full radio protocol stack that is physically and logically integrated within a single physical structure in the wireless communication network 100. For example, an aggregated network node 110 may include a single standalone base station or a single TRP that operates with a full radio protocol stack to enable or facilitate communication between a UE 120 and a core network of the wireless communication network 100.
[0047] Alternatively, a network node 110 may be a disaggregated network node 110 (sometimes referred to as a disaggregated base station) , having a disaggregated architecture, meaning that the network node 110 may operate with a radio protocol stack that is physically distributed or logically distributed among two or more nodes in the same geographic location or in different geographic locations. In some deployments, disaggregated network nodes 110 may be used in an integrated access and backhaul (IAB) network, in an open radio access network (O-RAN) (such as a network configuration in compliance with the O-RAN Alliance) , or in a virtualized radio access network (vRAN) , also known as a cloud radio access network (C-RAN) , to facilitate scaling by separating network functionality into multiple units or modules that can be individually deployed.
[0048] The disaggregated network nodes 110 of the wireless communication network 100 may include one or more central units (CUs) , one or more distributed units (DUs) , and one or more radio units (RUs) . A CU may host one or more higher layers, such as a radio resource control (RRC) layer, a packet data convergence protocol (PDCP) layer, and a service data adaptation protocol (SDAP) layer, among other examples. A CU can communicate with a core network either directly (for example, via a backhaul link) or indirectly (for example, via one or more disaggregated control units, such as a non-real-time (Non-RT) RAN intelligent controller (RIC) associated with a Service Management and Orchestration (SMO) framework or a near-real-time (Near-RT) RIC) . A DU may host one or more of a radio link control (RLC) layer, a medium access control (MAC) layer, or one or more higher physical (PHY) layers depending, at least in part, on a functional split, such as a functional split defined by the 3GPP. In some examples, a DU also may host a lower PHY layer that is configured to perform functions, such as a fast Fourier transform (FFT) , an inverse FFT (IFFT) , beamforming, or physical random access channel (PRACH) extraction and filtering, among other examples. An RU may perform RF processing functions or lower PHY layer functions, such as an FFT, an IFFT, beamforming, or PRACH extraction and filtering, among other examples, according to a functional split, such as a lower layer split (LLS) . In such an architecture, each RU can be operated to handle over the air (OTA) communication with one or more UEs 120. A CU may communicate with one or more DUs via respective midhaul links, such as via F1 interfaces. Each of the DUs may communicate with one or more RUs via respective fronthaul links. Each of the RUs may communicate with one or more UEs 120 via respective RF access links. In some deployments, a UE 120 may be simultaneously served by multiple RUs.
[0049] In some examples, a single network node 110 may include a combination of one or more CUs, one or more DUs, or one or more RUs. In some examples, a CU, a DU, or an RU may be implemented as a virtual unit, such as a virtual central unit (VCU) , a virtual distributed unit (VDU) , or a virtual radio unit (VRU) , among other examples, which may be implemented as a virtual network function, such as in a cloud deployment (for example, an open cloud (O-Cloud) platform) . An SMO framework may support RAN deployment and provisioning of non-virtualized and virtualized network elements.
[0050] In some examples, the wireless communication network 100 may be a heterogeneous network that includes network nodes 110 of various types. Different types of network nodes 110 may generally operate on the same or different operating bands, transmit at different power levels, or serve different coverage areas, each of which may be referred to as or associated with a particular cell 130 (for example, a cell 130a and a cell 130b) .
[0051] The UEs 120 may be physically dispersed throughout the coverage area of the wireless communication network 100, and each UE 120 may be stationary or mobile. A UE 120 may be, may include, or also may be referred to as an access terminal, a mobile station, a client device, or a subscriber unit. A UE 120 may be, include, or be coupled with a cellular phone (for example, a smart phone) , a personal digital assistant (PDA) , a wireless modem, a wireless communication device, a handheld device, a laptop computer, a cordless phone, a wireless local loop (WLL) station, a tablet, a camera, a netbook, a smartbook, an ultrabook, a medical device, a biometric device, a wearable device (for example, a smart watch, smart clothing, smart glasses, a smart wristband, or smart jewelry) , a gaming device, an entertainment device (for example, a music device, a video device, or a satellite radio) , an XR device, a vehicular component or sensor, a smart meter or sensor, industrial manufacturing equipment, a Global Navigation Satellite System (GNSS) device (such as a Global Positioning System device or another type of positioning device) , an artificially intelligent robot or other device implementing artificial intelligence, a UE function of a network node, or any other suitable device or function that may communicate in the wireless communication network 100.
[0052] Some UEs 120 may be classified according to different categories in association with different complexities or different capabilities. UEs 120 in a first category may be associated with relatively low complexity or cost such as NB-IoT devices or eMTC UEs. UEs 120 in a second category may include higher complexity or cost devices, such as mission-critical IoT devices, baseline UEs, high-tier UEs, advanced UEs, full-capability UEs, or premium UEs that are capable of URLLC, eMBB, or precise positioning in the wireless communication network 100. A third category of UEs 120 may have mid-tier complexity or capabilities (for example, capabilities between that of the UEs 120 of the first category and the UEs 120 of the second category) . A UE 120 of the third category may be referred to as a reduced capability UE ( “RedCap UE” ) , a mid-tier UE, an NR-Light UE, or an NR-Lite UE, among other examples.
[0053] In some examples, a network node 110 may be, may include, or may operate as an RU, a TRP, or a base station that communicates with one or more UEs 120 via a radio access link (which may be referred to as a “Uu” link) . The radio access link may include a downlink and an uplink. “Downlink” (or “DL” ) refers to a communication direction from a network node 110 to a UE 120, and “uplink” (or “UL” ) refers to a communication direction from a UE 120 to a network node 110. Downlink and uplink resources may include time domain resources (for example, frames, subframes, slots, and symbols) , frequency domain resources (for example, frequency bands, component carriers (CCs) , subcarriers, resource blocks, and resource elements) , and spatial domain resources (for example, particular transmit directions or beams) .
[0054] Frequency domain resources may be subdivided into bandwidth parts (BWPs) . A BWP may be a block of frequency domain resources (for example, a continuous set of resource blocks (RBs) within a full component carrier bandwidth) that may be configured at a UE-specific level. A UE 120 may be configured with both an uplink BWP and a downlink BWP (which may be the same or different) . Each BWP may be associated with its own numerology (indicating a sub-carrier spacing (SCS) and cyclic prefix (CP) ) . A BWP may be dynamically configured or activated (for example, by a network node 110 transmitting a downlink control information (DCI) configuration to the one or more UEs 120) or reconfigured (for example, in real-time or near-real-time) according to changing network conditions in the wireless communication network 100 or specific requirements of one or more UEs 120. An active BWP defines the operating bandwidth of the UE 120 within the operating bandwidth of the serving cell.
[0055] As used herein, a downlink signal may be or include a reference signal, control information, or data. For example, downlink reference signals include a primary synchronization signal (PSS) , a secondary SS (SSS) , an SS block (SSB) (for example, that includes a PSS, an SSS, and a physical broadcast channel (PBCH) ) , a demodulation reference signal (DMRS) , a phase tracking reference signal (PTRS) , a tracking reference signal (TRS) , and a channel state information (CSI) reference signal (CSI-RS) , among other examples. A downlink signal carrying control information or data may be transmitted via a downlink channel. Downlink channels may include one or more control channels for transmitting control information and one or more data channels for transmitting data. Downlink reference signals may be transmitted in addition to, or multiplexed with, downlink control channel communications or downlink data channel communications. A downlink control channel may be specifically used to transmit DCI from a network node 110 to a UE 120. DCI generally contains the information the UE 120 needs to identify RBs in a subsequent subframe and how to decode them, including a modulation and coding scheme (MCS) or redundancy version parameters. Different DCI formats carry different information, such as scheduling information in the form of downlink or uplink grants, slot format indicators (SFIs) , preemption indicators (PIs) , transmit power control (TPC) commands, hybrid automatic repeat request (HARQ) information, new data indicators (NDIs) , among other examples. A downlink data channel may be used to transmit downlink data (for example, user data associated with a UE 120) from a network node 110 to a UE 120. Downlink control channels may include PDCCHs, and downlink data channels may include physical downlink shared channels (PDSCHs) . Control information or data communications may be transmitted on a PDCCH and PDSCH, respectively. For example, a PDCCH can carry DCI, while a PDSCH can carry a MAC control element (MAC-CE) , an RRC message, or user data, among other examples. Each PDSCH may carry one or more transport blocks (TBs) of data.
[0056] As used herein, an uplink signal may include a reference signal, control information, or data. For example, uplink reference signals include a sounding reference signal (SRS) , a PTRS, and a DMRS, among other examples. An uplink signal carrying control information or data may be transmitted via an uplink channel. An uplink channel may include one or more control channels for transmitting control information and one or more data channels for transmitting data. Uplink reference signals may be transmitted in addition to, or multiplexed with, uplink control channel communications or uplink data channel communications. An uplink control channel may be specifically used to transmit uplink control information (UCI) from a UE 120 to a network node 110. An uplink data channel may be used to transmit uplink data (for example, user data associated with a UE 120) from a UE 120 to a network node 110. Uplink control channels may include physical uplink control channels (PUCCHs) , and uplink data channels may include physical uplink shared channels (PUSCHs) . Control information or data communications may be transmitted on a PUCCH and PUSCH, respectively. For example, a PUCCH can carry UCI, while a PUSCH can carry a MAC-CE, an RRC message, or user data, among other examples. UCI can include a scheduling request (SR) , HARQ feedback information (for example, a HARQ acknowledgement (ACK) indication or a HARQ negative acknowledgement (NACK) indication) , uplink power control information (for example, an uplink TPC parameter) , or CSI, among other examples. CSI can include a channel quality indicator (CQI) (indicative of downlink channel conditions to facilitate selection of transmission parameters, such as an MCS, by a network node 110) , a precoding matrix indicator (PMI) , a CSI-RS resource indicator (CRI) (for example, indicative of a beam used to transmit a CSI-RS) , an SS / PBCH resource block indicator (SSBRI) (for example, indicative of a beam used to transmit an SSB) , a layer indicator (LI) , a rank indicator (RI) , or measurement information (for example, a layer 1 (L1) -reference signal received power (RSRP) parameter, a received signal strength indicator (RSSI) parameter, a reference signal received quality (RSRQ) parameter, among other examples) which can be used for beam management, among other examples. Each PUSCH may carry one or more TBs of data.
[0057] The information (for example, data, control information, or reference signal information) transmitted by a network node 110 to a UE 120, or vice versa, may be represented as a sequence of binary bits that are mapped (for example, modulated) to an analog signal waveform (for example, a discrete Fourier transform (DFT) -spread-orthogonal frequency division multiplexing (OFDM) (DFT-s-OFDM) waveform or a CP-OFDM waveform) that is transmitted by the network node 110 or UE 120 over a wireless communication channel. In some examples, the network node 110 or the UE 120 (for example, using the processing system 145 or the processing system 140, respectively) may select an MCS (for example, an order of quadrature amplitude modulation (QAM) , such as 64-QAM, 128-QAM, or 256-QAM, among other examples) for a downlink signal or an uplink signal. For example, the network node 110 may select an MCS for a downlink signal in accordance with UCI received from the UE 120 or may transmit, to the UE 120, an indication of an MCS to be applied for an uplink signal.
[0058] A network node 110 or a UE 120 (such as by using the processing system 145 or the processing system 140, respectively, or one or more coupled modems) may perform signal processing on the information (such as filtering, amplification, modulation, digital-to-analog conversion, an IFFT operation, multiplexing, interleaving, mapping, or encoding, among other examples) to generate a processed signal in accordance with the selected MCS. In some examples, the network node 110 or the UE 120 (for example, using the processing system 145 or the processing system 140, respectively, or one or more coupled encoders or modems) may perform a channel coding operation or a forward error correction (FEC) operation to control errors in transmitted information. For example, the network node 110 or the UE 120 may perform an encoding operation to generate encoded information (such as by selectively introducing redundancy into the information, typically using an error correction code (ECC) , such as a polar code or a low-density parity-check (LDPC) code) . The network node 110 or the UE 120 (for example, using the processing system 145 or one or more modems) may further perform spatial processing (for example, precoding) on the encoded information to generate one or more processed or precoded signals for downlink or uplink transmission, respectively. In some examples, the network node 110a or the UE 120a may perform codebook-based precoding or non-codebook-based precoding. Codebook-based precoding may involve selecting a precoder (for example, a precoding matrix) using a codebook. For example, the network node 110a may provide precoding information indicating which precoder, defined by the codebook, is to be used by the UE 120a. Non-codebook-based precoding may involve selecting or deriving a precoder based on, or otherwise associated with, one or more downlink or uplink signal measurements. The network node 110a or the UE 120a may transmit the processed downlink or uplink signals, respectively, via one or more antennas.
[0059] The network node 110a or the UE 120a may receive uplink signals or downlink signals, respectively, via one or more antennas. The network node 110a or the UE 120a (for example, using the processing system 145 or the processing system 140, respectively, or one or more coupled modems) may perform signal processing (for example, in accordance with the MCS) on the received uplink or downlink signals, respectively (such as filtering, amplification, demodulation, analog-to-digital conversion, an FFT operation, demultiplexing, deinterleaving, de-mapping, equalization, interference cancellation, or decoding, among other examples) , to map the received signal (s) to a sequence of binary bits (for example, received information) that estimates the information transmitted by the network node 110 or the UE 120 via the downlink or uplink signals. The network node 110a or the UE 120a (for example, using the processing system 145 or the processing system 140, respectively, or a coupled decoder or one or more modems) may decode the received information (such as by using an ECC, a decoding operation, or an FEC operation) to detect errors or correct bit errors in the received information to generate decoded information. The decoded information may estimate the information transmitted via the downlink or uplink signals.
[0060] In some examples, a UE 120 and a network node 110 may perform MIMO communication. MIMO communication generally refers to transmitting or receiving multiple signals (such as multiple layers or multiple data streams) simultaneously over the same time and frequency resources. A network node 110 or a UE 120 may communicate using single-user MIMO or multi-user MIMO (MU-MIMO) , the latter of which being used by a network node 110 to simultaneously transmit signals to multiple UEs 120. MIMO techniques may involve spatial multiplexing (multi-layer transmission) or beamforming. To implement beamforming, the amplitudes or phases of signals transmitted via antenna elements may be modulated and shifted relative to each other (such as by manipulating a phase shift, a phase offset, or an amplitude) to generate one or more beams. For example, a network node 110 may generate one or more beams 160a, and a UE 120 may generate one or more beams 160b. The term “beam” may refer to a directional transmission of a wireless signal toward a receiving device or otherwise in a desired direction, a directional reception of a wireless signal from a transmitting device or otherwise in a desired direction, a direction associated with such a directional transmission or directional reception, a set of directional resources associated with a signal transmission or signal reception (for example, an angle of arrival, a horizontal direction, or a vertical direction) , or a set of parameters or resources associated with one or more aspects of a directional signal, among other examples.
[0061] In some examples, a network node 110 or a UE 120 may implement massive MIMO, which may be associated with an increased (for example, “massive” ) quantity of antennas at the network node 110 or at the UE 120, such as in a network implementing mmWave technology, which enables more precise beamforming or reduced interference. In some examples, the wireless communication network 100 may implement multi-TRP (mTRP) operation (including redundant transmission or reception on multiple TRPs) or non-coherent joint transmission (NC-JT) .
[0062] The network node 110 and the UE 120 may establish a communication link or beam pair, and otherwise increase reliability, throughput, signal strength, or other signal properties for MIMO communications, by performing beam management operations, such as an initial beam acquisition operation, a beam refinement operation, or a beam recovery operation. For example, an initial beam acquisition operation may involve the network node 110 transmitting signals (for example, SSBs or other signals) via respective beams (for example, of the beams 160 of the network node 110) and the UE 120 receiving and measuring the signal (s) via respective beams of multiple beams (for example, from the beams 160 of the UE 120) to identify a best beam (or beam pair) for communication between the UE 120 and the network node 110. A beam refinement operation may involve a first device (for example, the UE 120 or the network node 110) transmitting signal (s) via a subset of beams (for example, identified based on, or otherwise associated with, measurements reported as part of one or more other beam management operations) . A second device (for example, the network node 110 or the UE 120) may receive the signal (s) via a single beam (for example, to identify the best beam for communication from the subset of beams) . The beam (s) may be identified or defined via one or more spatial parameters, such as a transmission configuration indicator (TCI) state or a quasi co-location (QCL) parameter, among other examples.
[0063] Some aspects and techniques as described herein may be implemented, at least in part, using an artificial intelligence (AI) program (for example, referred to herein as an “AI / ML model” ) , such as a program that includes a machine learning (ML) model or an artificial neural network (ANN) model. The AI / ML model may be deployed at one or more devices 165 (for example, one or more network nodes 110, one or more UEs 120, one or more servers, or one or more components of a cloud computing network, among other examples) . For example, in a deployment in which AI / ML functionality is performed independently at a device 165, sometimes referred to as “overlay AI / ML, ” the AI / ML model (or an instance or portion of the AI / ML model) may be deployed at a UE 120 (for example, by the processing system 140) , a network node 110 (for example, by the processing system 145) , one or more servers, or one or more components of a cloud computing network, among other examples. Additionally, or alternatively, in a deployment where AI / ML functionality is coordinated between different devices 165, sometimes referred to as “coordinated AI / ML, ” or performed at all device and network layers, sometimes referred to as “native AI / ML, ” the AI / ML model (or an instance of the AI / ML model) may be deployed at multiple devices 165 (for example, a first portion of the AI / ML model may be deployed at a UE 120 and a second portion of the AI / ML model may be deployed at a network node 110) . In other examples of coordinated AI / ML or native AI / ML, a first AI / ML model may be deployed at a UE 120 and a second AI / ML model may be deployed at a network node 110. The AI / ML model (s) may be configured to enhance various aspects of the wireless communication network 100 (for example, to increase privacy, reliability, or efficient use of network bandwidth, or to reduce latency, among other examples) . For example, the AI / ML model (s) may be trained to identify patterns or relationships in data corresponding to the wireless communication network 100, a device, or an air interface, among other examples. The AI / ML model (s) may support operational decisions relating to one or more aspects associated with wireless communications devices, networks, or services.
[0064] Accordingly, in some examples, the AI / ML model (s) may enable AI-as-a-Service (for example, an end-to-end AI / ML service via a user plane) for use cases, such as a self-organizing network (SON) , minimization of drive test (MDT) , quality of experience (QoE) , positioning, sensing, predictive mobility, or traffic prediction, among other examples. In some examples, AI-as-a-Service use cases may include measurement collection reporting by a UE 120, device selection criteria (for example, according to a geographical area where measurements are to be collected or UE capabilities to be used to collected measurements) , or reporting configurations (for example, reporting parameters such as location, time, or sensor information, among other examples) . Additionally, or alternatively, the AI / ML model (s) may enable AI / ML procedures (for example, RAN-triggered service establishment, configuration, inferencing using UE-side or network-side models, performance monitoring or management, or capability signaling, among other examples) . Additionally, or alternatively, the AI / ML model (s) may enable RAN-based AI / ML services via one or more application program interfaces (APIs) or management interfaces for use cases, such as beam management, radio resource monitoring (RRM) relaxation, mobility prediction, load prediction, network energy savings, or coverage and capacity improvements, among other examples.
[0065] In some aspects, a UE 120 may include a communication manager 150. As described in more detail elsewhere herein, the communication manager 150 may receive a PDCCH order associated with a PRACH communication, wherein the PDCCH order includes DCI with a 1-bit indicator, wherein the DCI indicates an SSB and a preamble index; perform a first transmission of the PRACH communication based at least in part on the SSB, the preamble index, and the 1-bit indicator; and perform a second transmission of the PRACH communication based at least in part on the SSB, the preamble index, and the 1-bit indicator, and based at least in part on determining that the PRACH communication was not successfully received. Additionally, or alternatively, the communication manager 150 may perform one or more other operations described herein.
[0066] In some aspects, a network node 110 may include a communication manager 155. As described in more detail elsewhere herein, the communication manager 155 may transmit a PDCCH order associated with a PRACH communication, wherein the PDCCH order includes DCI with a 1-bit indicator, wherein the DCI indicates an SSB and a preamble index; and receive a transmission of the PRACH communication based at least in part on the SSB, the preamble index, and the 1-bit indicator, wherein the transmission of the PRACH communication comprises a second transmission of the PRACH communication that is transmitted based at least in part on the SSB, the preamble index, and the 1-bit indicator and based at least in part on determining that a first transmission of the PRACH communication was not successfully received by the network node, and wherein the second transmission of the PRACH communication is performed without transmitting a PDCCH order associated with the second transmission of the PRACH communication. Additionally, or alternatively, the communication manager 155 may perform one or more other operations described herein.
[0067] The network node 110, the processing system 145 of the network node 110, the UE 120, the processing system 140 of the UE 120, or any other component (s) of Fig. 1 may implement one or more techniques or perform one or more operations associated with power ramp-up for PRACH transmissions, as described in more detail elsewhere herein. For example, the processing system 145 of the network node 110, or the processing system 140 of the UE 120 may perform or direct operations of, for example, process 700 of Fig. 7, process 800 of Fig. 8, or other processes as described herein (alone or in conjunction with one or more other processors) . Memory of the network node 110 may store data and program code (or instructions) for the network node 110. In some examples, the memory of the network node 110 may store data relating to a UE 120, such as RRC state information or a UE context. Memory of a UE 120 may store data and program code (or instructions) for the UE 120, such as context information. In some examples, the memory of the UE 120 or the memory of the network node 110 may include a non-transitory computer-readable medium storing a set of instructions for wireless communication. For example, the set of instructions, when executed by one or more processors (for example, of the processing system 145 or the processing system 140) of the network node 110, or the UE 120, may cause the one or more processors to perform process 700 of Fig. 7, process 800 of Fig. 8, or other processes as described herein. In some examples, executing instructions may include running the instructions, converting the instructions, compiling the instructions, or interpreting the instructions, among other examples.
[0068] In some aspects, a UE includes means for receiving a PDCCH order associated with a PRACH communication, wherein the PDCCH order includes DCI with a 1-bit indicator, wherein the DCI indicates an SSB and a preamble index; means for performing a first transmission of the PRACH communication based at least in part on the SSB, the preamble index, and the 1-bit indicator; or means for performing a second transmission of the PRACH communication based at least in part on the SSB, the preamble index, and the 1-bit indicator, and based at least in part on determining that the PRACH communication was not successfully received. The means for the UE to perform operations described herein may include, for example, one or more of communication manager 150, processing system 140, a radio, one or more RF chains, one or more transceivers, one or more antennas, one or more modems, a reception component (for example, reception component 902 depicted and described in connection with Fig. 9) , or a transmission component (for example, transmission component 904 depicted and described in connection with Fig. 9) , among other examples.
[0069] In some aspects, the network node includes means for transmitting a PDCCH order associated with a PRACH communication, wherein the PDCCH order includes DCI with a 1-bit indicator, wherein the DCI indicates an SSB and a preamble index; or means for receiving a transmission of the PRACH communication based at least in part on the SSB, the preamble index, and the 1-bit indicator, wherein the transmission of the PRACH communication comprises a second transmission of the PRACH communication that is transmitted based at least in part on the SSB, the preamble index, and the 1-bit indicator and based at least in part on determining that a first transmission of the PRACH communication was not successfully received by the network node, and wherein the second transmission of the PRACH communication is performed without transmitting a PDCCH order associated with the second transmission of the PRACH communication. The means for the network node to perform operations described herein may include, for example, one or more of communication manager 155, processing system 145, a radio, one or more RF chains, one or more transceivers, one or more antennas, one or more modems, a reception component (for example, reception component 1002 depicted and described in connection with Fig. 10) , or a transmission component (for example, transmission component 1004 depicted and described in connection with Fig. 10) , among other examples.
[0070] Fig. 2 is a diagram illustrating an example 200 of a two-step random access procedure. As shown in Fig. 2, a network node 110 and a UE 120 may communicate with one another to perform the two-step random access procedure.
[0071] As shown by reference number 205, the network node 110 may transmit, and the UE 120 may receive, one or more SSBs and random access configuration information. In some aspects, the random access configuration information may be transmitted in or indicated by system information (e.g., in one or more system information blocks (SIBs) ) or an SSB, such as for contention-based random access. Additionally, or alternatively, the random access configuration information may be transmitted in an RRC message or a PDCCH order message that triggers a random access channel (RACH) procedure, such as for contention-free random access. The random access configuration information may include one or more parameters to be used in the two-step random access procedure, such as one or more parameters for transmitting a random access message (RAM) or receiving a random access response (RAR) to the RAM.
[0072] As shown by reference number 210, the UE 120 may transmit, and the network node 110 may receive, a RAM preamble. As shown by reference number 215, the UE 120 may transmit, and the network node 110 may receive, a RAM payload. As shown, the UE 120 may transmit the RAM preamble and the RAM payload to the network node 110 as part of an initial (or first) step of the two-step random access procedure. In some aspects, the RAM may be referred to as message A, msgA, a first message, or an initial message in a two-step random access procedure. Furthermore, in some aspects, the RAM preamble may be referred to as a message A preamble, a msgA preamble, a preamble, or a PRACH preamble, and the RAM payload may be referred to as a message A payload, a msgA payload, or a payload. In some aspects, the RAM may include some or all of the contents of message 1 (msg1) and message 3 (msg3) of a four-step random access procedure, which is described in more detail below. For example, the RAM preamble may include some or all contents of message 1 (e.g., a PRACH preamble) , and the RAM payload may include some or all contents of message 3 (e.g., a UE identifier, uplink control information (UCI) , or a physical uplink shared channel (PUSCH) transmission) .
[0073] As shown by reference number 220, the network node 110 may receive the RAM preamble transmitted by the UE 120. If the network node 110 successfully receives and decodes the RAM preamble, the network node 110 may then receive and decode the RAM payload.
[0074] As shown by reference number 225, the network node 110 may transmit an RAR (sometimes referred to as an RAR message) . As shown, the network node 110 may transmit the RAR message as part of a second step of the two-step random access procedure. In some aspects, the RAR message may be referred to as message B, msgB, or a second message in a two-step random access procedure. The RAR message may include some or all of the contents of message 2 (msg2) and message 4 (msg4) of a four-step random access procedure. For example, the RAR message may include the detected PRACH preamble identifier, the detected UE identifier, a timing advance value, or contention resolution information.
[0075] As shown by reference number 230, as part of the second step of the two-step random access procedure, the network node 110 may transmit a PDCCH communication for the RAR. The PDCCH communication may schedule a physical downlink shared channel (PDSCH) communication that includes the RAR. For example, the PDCCH communication may indicate a resource allocation (e.g., in DCI) for the PDSCH communication.
[0076] As shown by reference number 235, as part of the second step of the two-step random access procedure, the network node 110 may transmit the PDSCH communication for the RAR, as scheduled by the PDCCH communication. The RAR may be included in a medium access control (MAC) protocol data unit (PDU) of the PDSCH communication. As shown by reference number 240, if the UE 120 successfully receives the RAR, the UE 120 may transmit a HARQ ACK.
[0077] As indicated above, Fig. 2 is provided as an example. Other examples may differ from what is described with regard to Fig. 2.
[0078] Fig. 3 is a diagram illustrating an example of a four-step random access procedure. As shown in Fig. 3, a network node 110 and a UE 120 may communicate with one another to perform the four-step random access procedure.
[0079] As shown by reference number 305, the network node 110 may transmit, and the UE 120 may receive, one or more SSBs and random access configuration information. In some aspects, the random access configuration information may be transmitted in or indicated by system information (e.g., in one or more SIBs) or an SSB, such as for contention-based random access. Additionally, or alternatively, the random access configuration information may be transmitted in an RRC message or a PDCCH order message that triggers a RACH procedure, such as for contention-free random access. The random access configuration information may include one or more parameters to be used in the random access procedure, such as one or more parameters for transmitting a RAM or one or more parameters for receiving an RAR.
[0080] As shown by reference number 310, the UE 120 may transmit a RAM, which may include a preamble (sometimes referred to as a random access preamble, a PRACH preamble, or a RAM preamble) . The message that includes the preamble may be referred to as a message 1, msg1, MSG1, a first message, or an initial message in a four-step random access procedure. The random access message may include a random access preamble identifier.
[0081] As shown by reference number 315, the network node 110 may transmit an RAR as a reply to the preamble. The message that includes the RAR may be referred to as message 2, msg2, MSG2, or a second message in a four-step random access procedure. In some aspects, the RAR may indicate the detected random access preamble identifier (e.g., received from the UE 120 in msg1) . Additionally, or alternatively, the RAR may indicate a resource allocation to be used by the UE 120 to transmit message 3 (msg3) .
[0082] In some aspects, as part of the second step of the four-step random access procedure, the network node 110 may transmit a PDCCH communication for the RAR. The PDCCH communication may schedule a PDSCH communication that includes the RAR. For example, the PDCCH communication may indicate a resource allocation for the PDSCH communication. Also as part of the second step of the four-step random access procedure, the network node 110 may transmit the PDSCH communication for the RAR, as scheduled by the PDCCH communication. The RAR may be included in a MAC PDU of the PDSCH communication.
[0083] As shown by reference number 320, the UE 120 may transmit an RRC connection request message. The RRC connection request message may be referred to as message 3, msg3, MSG3, or a third message of a four-step random access procedure. In some aspects, the RRC connection request may include a UE identifier, UCI, or a PUSCH communication (e.g., an RRC connection request) .
[0084] As shown by reference number 325, the network node 110 may transmit an RRC connection setup message. The RRC connection setup message may be referred to as message 4, msg4, MSG4, or a fourth message of a four-step random access procedure. In some aspects, the RRC connection setup message may include the detected UE identifier, a timing advance value, or contention resolution information. As shown by reference number 330, if the UE 120 successfully receives the RRC connection setup message, the UE 120 may transmit a HARQ ACK.
[0085] As indicated above, Fig. 3 is provided as an example. Other examples may differ from what is described with regard to Fig. 3.
[0086] Fig. 4 is a diagram illustrating an example 400 of an asymmetric downlink and uplink deployment. The example 400 shown by Fig. 4 is an example of an asymmetric downlink and uplink deployment that may be used to improve a coverage or a capacity of an uplink direction.
[0087] As used herein, an asymmetric downlink and uplink deployment may refer to a network architecture that includes a first quantity of downlink TRPs and a second, greater quantity of uplink TRPs. For example, the uplink dense deployment may include a single downlink TRP and multiple (e.g., 2, 3, 5, 10, or the like) uplink TRPs.
[0088] As shown in Fig. 4, the asymmetric downlink and uplink deployment may include a network node 110 that communicates with a UE 120. In some cases, the network node 110 may be a downlink network node that supports downlink communications or a combination of downlink communications and uplink communications. A downlink network node may alternatively be referred to as a downlink TRP.
[0089] The asymmetric downlink and uplink deployment shown by Fig. 4 also includes multiple uplink-only network nodes 402, shown as UL-only network node 402-1, UL-only network node 402-2, UL-only network node 402-3, and UL-only network node 402-4. An uplink-only network node may alternatively be referred to as an uplink TRP. In some cases, the network node 110, the UE 120, and the uplink-only network nodes 402 may communicate in a wireless communication network, such as wireless communication network 100. The UE 120 may communicate with the network node 110 using a downlink or a combination of an uplink and a downlink. Alternatively, or additionally, the UE 120 may communicate with the uplink-only network nodes 402 using only an uplink. Downlink signals or downlink channels transmitted by the network node 110 may be from a different node, such as a macro node, a central node, a serving cell, or a serving base station.
[0090] The various uplink-only network nodes 402 (e.g., the UL-only network node 402-1, the UL-only network node 402-2, the UL-only network node 402-3, or the UL-only network node 402-4) may provide an asymmetric downlink and uplink deployment in one or more coverage regions. More particularly, the uplink dense deployment may provide asymmetric downlink and uplink densification, where a quantity of the uplink-only network nodes 402 generally exceeds a quantity of network nodes 110 that support downlink communication or downlink and uplink communication.
[0091] For example, in an asymmetric downlink and uplink deployment, uplink signals or uplink channels that are transmitted by the UE 120 are received by one or more of the uplink-only network nodes 402, and downlink signals or downlink channels are transmitted only from the network node 110. In this way, the uplink dense deployment may reduce an uplink pathloss, which may improve performance in cases where uplink coverage is a performance bottleneck or reduce deployment costs or deployment complexity based at least in part on the uplink-only network nodes 402 not transmitting any downlink signals or downlink channels. Instead, the uplink-only network nodes 402 receive the uplink signals or uplink channels and forward the uplink signals or uplink channels to the network node 110 via a respective backhaul link, generally shown by reference number 404. The uplink-only network nodes 402 may receive an uplink signal and forward the uplink signal to the network node 110 with or without processing.
[0092] The network node 110 may compute one or more channel estimation metrics (e.g., CSI) that enable the network node 110 to select one or more transmission parameters that increase a quality of a downlink communication (e.g., increased signal power level, increased signal-to-noise radio (SNR) , decreased recovery errors, increased data throughput, or decreased data transfer latencies) . Accordingly, the UE 120 may transmit an uplink reference signal (e.g., an SRS) that the network node 110 uses to compute the channel estimation metric (s) .
[0093] As indicated above, Fig. 4 is provided as an example. Other examples may differ from what is described with regard to Fig. 4.
[0094] Figs. 5A and 5B are diagrams illustrating a first example 500 and a second example 502, respectively, of a PDCCH order that is associated with triggering a RACH procedure (e.g., a PDCCH ordered RACH procedure) .
[0095] In some cases, a network node (e.g., a network node 110) may transmit a PDCCH order to instruct a UE (e.g., 120) to initiate a RACH procedure, such as the four-step RACH procedure described with regard to Fig. 3 or a two-step RACH procedure described with regard to Fig. 2. As one example, the network node may transmit the PDCCH order in DCI based at least in part on using a DCI format that is specific to or associated with the PDCCH order. That is, the DCI format may partition the DCI into one or more fields that are specific to the PDCCH order. The network node may transmit the PDCCH order based at least in part on a variety of trigger events, such as a trigger event associated with the network node detecting that the UE’s timing is out-of-sync with the network node’s timing. In some cases, the network node may transmit a PDCCH order that is associated with another network node, such as a candidate network node, as described below.
[0096] The first example 500, shown by Fig. 5A, includes a communication exchange between a network node 504 (e.g., a network node 110) and a UE 506 (e.g., a UE 120) . A horizontal axis in the first example 500 represents time. As described above, the network node 504 may transmit a PDCCH order 508 that instructs the UE 506 to initiate a RACH procedure. In some cases, the network node 504 may transmit the PDCCH order in DCI based at least in part on using a DCI format specific to the PDCCH order. Alternatively, or additionally, the network node 504 may indicate random access configuration information that is associated with the RACH procedure, such as by transmitting the random access configuration information in an SIB prior to transmitting the PDCCH order 508, in an RRC message prior to transmitting the PDCCH order 508, or in the PDCCH order 508. As shown by Fig. 5A, the UE 506 may respond to the PDCCH order 508 based at least in part on transmitting a PRACH 510 to the network node 504.
[0097] In some cases, the UE 506 may determine that the PRACH 510 was not successfully received by the network node 504. For example, the random access configuration information may indicate a random access response window. The random access response window may correspond to a window of time during which the UE 506 is to receive an RAR. The UE 506 may determine that an RAR that contains a random access preamble identifier that is associated with a random access preamble transmitted by the UE 506 was not received upon an expiration of the random access response window. The UE 506 may determine that the PRACH 510 was not successfully received by the network node 504 based at least in part on the RAR not being received upon the expiration of the random access response window.
[0098] In some cases, the UE 506 may retransmit the PRACH 510 based at least in part on the PRACH 510 not being successfully received by the network node 504 or RAR in response to the PRACH 510 not being received by the UE 506. In these cases, the UE 506 may autonomously (e.g., without waiting to receive another PDCCH order) retransmit the PRACH 510. In some cases, the UE 506 may retransmit the PRACH 510 with power ramp-up (e.g., increment a preamble power ramping counter by 1 to cause the retransmission of the PRACH to be transmitted at a higher power relative to the initial transmission of the PRACH) . For example, the UE may retransmit the PRACH with power ramp-up if the spatial domain transmission filter for PRACH is not changed and if a selected SSB or CSI-RS is not changed from the SSB or CSI-RS selected for the transmission of the previous random access preamble transmission.
[0099] The second example 502, shown by Fig. 5B, includes a communication exchange between the network node 504, the UE 506, and a second network node 512. In some cases, the network node 504 may act as a primary cell of a master cell group or a secondary cell group (e.g., a special cell (SPCell) ) that provides service to the UE 506. A horizontal axis in the second example 502 represents time.
[0100] In some cases, the network node 504 may transmit a PDCCH order 514 that instructs the UE 506 to initiate a RACH procedure (e.g., a PDCCH ordered RACH procedure) that is associated with the second network node 512. To illustrate, the second network node 512 may be a candidate network node or candidate cell for inclusion in the master cell group, inclusion in the secondary cell group, or for a UE handover (e.g., the UE 506) . Accordingly, and based at least in part on acting as an SPCell, the network node 504 may transmit the PDCCH order 514 to instruct the UE 506 to perform a RACH procedure with the second network node 512. As shown by Fig. 5B, the UE 506 may transmit a PRACH 516 to the second network node 512 as part of performing the PDCCH ordered RACH procedure.
[0101] In an asymmetric downlink and uplink deployment, a 1-bit DCI may be included in the PDCCH order 514 DCI to indicate whether the PRACH transmission is based on an indicated joint or uplink TCI state (or that the PRACH transmission is not based on the indicated joint or uplink TCI state) . However, there may be ambiguity on how a UE performs PRACH retransmissions. To illustrate, for such a PDCCH order, the UE may not receive an RAR from the candidate network node that confirms receipt of the PRACH. In some cases, the PDCCH order 514 may include a 1-bit DCI indicating that the PRACH transmission is based on an indicated joint or uplink TCI state. A first ambiguity may be associated with whether the UE automatically transmits a PRACH retransmission or waits for an instruction to transmit the PRACH retransmission. A second ambiguity may be associated with whether the UE is to follow the indicated joint or uplink TCI state for the PRACH retransmission.
[0102] In some cases, the indicated joint or uplink TCI state may change prior to the UE performing the PRACH retransmission. In these cases, a UE may be unable to determine whether the UE is to perform a retransmission or an initial transmission of the PRACH. Accordingly, a third ambiguity may be associated with what transmission power level the UE should use for transmitting the PRACH (e.g., an initial transmission power level for an initial transmission of the PRACH or an increased transmission power level for a PRACH retransmission) .
[0103] Without knowledge on whether the transmission of the PRACH is an initial PRACH transmission or a PRACH retransmission, the UE may use a transmission power level for transmitting a PRACH (or PRACH retransmission) that results in a candidate network node failing to receive the PRACH or the UE transmitting additional PRACH (re) transmissions that could have been mitigated with an appropriate transmission power level. The additional PRACH (re) transmissions may consume UE resources (e.g., battery power or computing resources) or air interface resources that could be used for other purposes and may result in a shorter battery life at the UE, delayed computations by the UE for other applications, decreased data throughput in a wireless network, or increased data transfer latencies in the wireless communication network.
[0104] Some techniques and apparatuses described herein provide for determining a transmission power level for a subsequent transmission of a PRACH (e.g., a second initial transmission of a retransmission of a PRACH) . As described below, when a PRACH transmission is not successfully received by a network node, the UE may perform a subsequent PRACH transmission based at least in part on an SSB, a preamble index, and a 1-bit indicator indicated by DCI included in a PDCCH order associated with the PRACH.
[0105] As indicated above, Figs. 5A and 5B are provided as examples. Other examples may differ from what is described with regard to Figs. 5A and 5B.
[0106] Fig. 6 is a diagram of an example 600 associated with power ramp-up for PRACH transmissions. As shown in Fig. 6, multiple network nodes may communicate with a UE (e.g., UE 120) . The multiple network nodes may include one or more network nodes 110, one or more TRPs, one or more CUs, one or more DUs, or one or more RUs, among other examples. In some aspects, the UE and the multiple network nodes may be part of a wireless communication network (e.g., wireless communication network 100) .
[0107] In some aspects, the UE and the multiple network nodes may be associated with an asymmetrical downlink and uplink deployment. In some aspects, the multiple network nodes may include a first network node that communicates with the UE. In some aspects, the first network node may be a downlink network node that supports downlink communications or a combination of downlink communications and uplink communications, as described above with respect to Fig. 4.
[0108] In some aspects, the multiple network nodes may include a group of second network nodes. In some aspects, a second network node may be an uplink-only network node. In some aspects, the UE may communicate with the first network node using a downlink or a combination of a downlink and an uplink. In some aspects, the UE may communicate with the second network node using only an uplink. In some aspects, downlink signals or downlink channels transmitted by the first network node may be from a different network node (e.g., the second network node) . The UE and the first network node may have established a wireless connection prior to operations shown in Fig. 6.
[0109] As shown by reference number 605, the first network node may transmit, and the UE may receive, a PDCCH order associated with a PRACH communication. In some aspects, the PDCCH order may include DCI with a 1-bit indicator.
[0110] In some aspects, the PDCCH order may include random access configuration information indicating one or more configuration parameters (e.g., already known to the UE or previously indicated by the first network node or another network device) for selection by the UE, or explicit configuration information for the UE to use to configure the UE to perform a random access procedure. For example, the DCI may indicate an SSB and a preamble index associated with performing a two-step or a four-step random access procedure.
[0111] In some aspects, the 1-bit indicator may be a 1-bit DCI field in DCI format 1_0. In some aspects, the 1-bit indicator may indicate whether a PRACH transmission power calculation includes a path loss offset, as described in greater detail below.
[0112] As shown by reference number 610, the first network node may transmit, and the UE may receive, a beam indication DCI indicating one or more joint or uplink TCI states. In some aspects, the beam indication DCI may indicate a joint or uplink TCI state. In some aspects, the 1-bit indicator included in the DCI may be set to a first value to indicate that the PRACH transmission power calculation does not include the path loss offset and the 1-bit indicator may be set to the second value to indicate that the PRACH transmission calculation includes the path loss offset associated with the joint or uplink TCI state.
[0113] In some aspects, the beam indication DCI indicates a first joint or uplink TCI state and a second joint or uplink TCI state. In these aspects, the 1-bit indicator may be set to the first value to indicate that a first path loss offset associated with the first joint or uplink transmission TCI state is included in a PRACH transmission power calculation or that a first or initial transmission of a PRACH communication is based at least in part on the first joint or uplink TCI state. Similarly, the 1-bit indicator may be set to the second value to indicate that a second path loss offset associated with the second joint or uplink transmission TCI state is included in the PRACH transmission power calculation or that the first or initial transmission of the PRACH communication is based at least in part on the second joint or uplink TCI state.
[0114] In some aspects, the one or more joint or uplink TCI states may remain unchanged during a time period. For example, the one or more joint or uplink TCI states may remain unchanged during a time period associated with performing a first initial transmission of a PRACH communication, a retransmission of a PRACH communication, a second initial transmission of the PRACH communication, a first initial transmission and a retransmission of a PRACH communication, or first and second initial transmissions of a PRACH communication, as described in greater detail below.
[0115] As shown by reference number 615, the UE may transmit a first or initial PRACH communication to the second network node. In some aspects, the UE may transmit the first or initial PRACH communication based at least in part on the SSB, the preamble index, and the 1-bit indicator indicated by the PDCCH order DCI.
[0116] As shown by reference number 620, the UE may determine that the first or initial transmission of the PRACH communication is unsuccessful. In some aspects, the UE may determine that the first or initial transmission of the PRACH communication is unsuccessful based at least in part on failing to receive an RAR during a random access response window.
[0117] For example, the PRACH order may include random access configuration information that indicates a time period (e.g., a random access response window) during which the UE is to monitor for an RAR. In some aspects, the UE may monitor for an RAR during the random access response window based at least in part on transmitting the first or initial PRACH communication.
[0118] In some aspects, the UE may not detect an RAR during the random access response window. In these aspects, the UE may determine that the first or initial PRACH communication was not successfully received by the second network node based at least in part on not detecting an RAR during the random access response window.
[0119] In some aspects, the UE may detect an RAR during the random access response window. However, the detected RAR may not include a random access preamble identifier associated with the preamble index indicated in the PDCCH order. In these aspects, the UE may determine that the PRACH communication was not successfully received by the second network node based at least in part on not detecting an RAR that includes a random access preamble identifier associated with the preamble index indicated in the PDCCH order.
[0120] As shown by reference number 625, the UE may determine a type of transmission associated with a second transmission of the PRACH communication. In some aspects, the type of the transmission may correspond to a retransmission of the PRACH communication or a second initial transmission of the PRACH communication.
[0121] In some aspects, the UE may determine a retransmission of PRACH communication without PDCCH order.
[0122] In some aspects, the UE may determine the type of transmission based at least in part on a second PDCCH order. For example, the first network node may transmit, and the UE may receive, a second PDCCH order that includes information indicating whether the second transmission of the PRACH communication is a retransmission or a second initial transmission of the PRACH communication.
[0123] In some aspects, the information indicating whether the second transmission of the PRACH communication is a retransmission or a second initial transmission of the first or initial PRACH communication may include a 1-bit indicator. In some aspects, the UE may determine whether the second transmission of the PRACH communication is a retransmission or a second initial transmission of the first or initial PRACH communication based at least in part on whether a value of the 1-bit indicator included in the second PDCCH order matches (e.g., is the same as) a value of the 1-bit indicator included in the previously received PDCCH order.
[0124] In some aspects, the value of the 1-bit indicator included in the second PDCCH order may match the 1-bit indicator included in the previously received PDCCH order. In these aspects, the UE may determine that the second transmission of the PRACH communication is a retransmission of the PRACH communication based at least in part on the value of the 1-bit indicator included in the second PDCCH order matching the 1-bit indicator included in the previously received PDCCH order.
[0125] In some aspects, the value of the 1-bit indicator included in the second PDCCH order may not match (e.g., may be different than) the 1-bit indicator included in the previously received PDCCH order. For example, the 1-bit indicator included in the second PDCCH order may be set to the first value and the 1-bit indicator included in the previously received PDCCH order may be set to the second value. In these aspects, the UE may determine that the second transmission of the PRACH communication is a second initial transmission of the PRACH communication based at least in part on the value of the 1-bit indicator included in the second PDCCH order not matching the 1-bit indicator included in the previously received PDCCH order.
[0126] In some aspects, the UE may determine whether the second transmission of the PRACH communication is transmitted with power ramp-up based on the type of the transmission. In some aspects, the UE may determine that the second transmission of the PRACH communication is transmitted with power-ramp up based on the second transmission of the PRACH communication being a retransmission of the first or initial transmission of the PRACH communication. In some aspects, the UE may determine that the second transmission of the PRACH communication is not transmitted with power ramp-up based at least in part on the second transmission of the PRACH communication being a second initial transmission of the PRACH communication.
[0127] In some aspects, the UE may determine whether the second transmission of the PRACH communication is transmitted with power ramp-up based at least in part on the 1-bit indicator. In some aspects, the 1-bit indicator may indicate that the path loss offset is not included in the PRACH transmission power calculation and the UE may determine that the second transmission of the PRACH communication is transmitted with power ramp-up based at least in part on the 1-bit indicator indicating that the path loss offset is not included in the PRACH transmission power calculation.
[0128] In some aspects, the UE may determine whether the second transmission of the PRACH communication is transmitted with power ramp-up based at least in part on whether the first or initial transmission of the PRACH communication is based on a joint or uplink TCI state indicated in a beam indication DCI. For example, the UE may receive a beam indication DCI indicating one joint or uplink TCI state. The UE may determine that the first or initial transmission of the PRACH communication is not based on the indicated joint or uplink TCI state (e.g., based at least in part on the 1-bit indicator included in the PDCCH order, as described above) . The UE may determine that the second transmission of the PRACH communication is transmitted with power ramp-up based at least in part on the first or initial transmission of the PRACH communication not being based on the indicated joint or uplink TCI state.
[0129] In some aspects, the UE may determine whether the second transmission of the PRACH communication is transmitted with power ramp-up based at least in part on whether a joint or uplink TCI state indicated in a beam indication DCI has changed. In some aspects, a joint or uplink TCI state indicated in a beam indication DCI may not change prior to the UE performing the second transmission of the PRACH communication. In these aspects, the UE may determine that the second transmission of the PRACH communication is transmitted with power ramp-up based at least in part on the joint or uplink TCI stated indicated in the beam indication DCI not changing prior to the UE performing the second transmission of the PRACH communication.
[0130] In some aspects, a joint or uplink TCI state indicated in a beam indication DCI may change prior to the UE performing the second transmission of the PRACH communication. For example, the joint or uplink TCI state may change from a first joint or uplink TCI state to a second joint or TCI state. In these aspects, the UE may determine whether the first or initial transmission of the PRACH communication followed the first joint or uplink TCI state.
[0131] In some aspects, the first or initial transmission of the PRACH communication may follow the first joint or uplink TCI state. The UE may determine that the second transmission of the PRACH communication is transmitted without power ramp-up based at least in part on the first joint or uplink TCI stated changing to the second joint or uplink TCI state.
[0132] In some aspects, the first or initial transmission of the PRACH communication may not follow the first joint or uplink TCI state. The UE may determine that the second transmission of the PRACH communication is transmitted with power ramp-up based at least in part on the first or initial transmission of the PRACH communication not following the first joint or uplink TCI state.
[0133] In some aspects, the UE may determine whether the second transmission of the PRACH communication is transmitted with power-ramp up based at least in part on a second PDCCH order. In some aspects, the second PDCCH order may indicate whether the second transmission of the PRACH communication is a retransmission of the PRACH communication or a second initial transmission of the PRACH communication. For example, the second PDCCH order may include a 1-bit retransmission indicator that is set to the first value to indicate that the second transmission of the PRACH communication is a retransmission of the PRACH communication and is set to the second value to indicate that the second transmission of the PRACH communication is a second initial transmission of the PRACH communication.
[0134] In some aspects, the second PDCCH order may indicate the SSB and the preamble index indicated by the previously received PDCCH order. In some aspects, the second PDCCH order may include DCI with another 1-bit indicator for PL offset indication. In some aspects, the PDCCH order indicates that the second transmission of the PRACH communication is a retransmission of the PRACH communication. The UE may determine that the second transmission of the PRACH communication is transmitted with power ramp-up based at least in part on the second PDCCH order indicating the SSB and the preamble index indicated by the previously received PDCCH order and based at least in part on the other 1-bit indicator being set to the first value.
[0135] In some aspects, the other 1-bit indicator may be set to the second value. In these aspects, the UE may determine whether the second transmission of the PRACH communication is transmitted with power ramp-up based at least in part on whether a joint or uplink TCI state indicated in a beam indication DCI changes prior to the second transmission of the PRACH communication.
[0136] In some aspects, the UE may determine that the second transmission of the PRACH communication is transmitted with power ramp-up based at least in part on the joint or uplink TCI state indicated in the beam indication DCI not changing prior to the second transmission of the PRACH communication. In some aspects, the UE may determine that the second transmission of the PRACH communication is transmitted without power ramp-up based at least in part on the joint or uplink TCI state indicated in the beam indication DCI changing prior to the second transmission of the PRACH communication.
[0137] In some aspects, the UE may determine that the second transmission of the PRACH communication is transmitted with power ramp-up. In these aspects, the UE may increment a PRACH preamble power ramping counter by one for the second transmission of the PRACH communication based at least in part on the second transmission of the PRACH communication being transmitted with power ramp-up. The UE may increase a transmit power for the second transmission of the PRACH communication based at least in part on the PRACH preamble power ramping counter being incremented by one.
[0138] In some aspects, the UE may determine that the second transmission of the PRACH communication is a second initial transmission of the PRACH communication. The UE may determine that the second transmission of the PRACH communication is not transmitted with power ramp-up based at least in part on the second transmission of the PRACH communication being the second initial transmission of the PRACH communication.
[0139] In these aspects, the UE may not increment the PRACH preamble power ramping counter by one based at least in part on the second transmission of the PRACH communication being transmitted without power ramp-up. In some aspects, the UE may reset the PRACH preamble power ramping counter based at least in part on the second transmission of the PRACH communication comprising the second initial transmission of the PRACH communication. The UE may transmit the second PRACH communication without an increased transmit power based at least in part on the PRACH preamble power ramping counter not being incremented by one or based at least in part on the PRACH preamble ramping counter being reset.
[0140] In some aspects, the UE may determine that the second transmission of the PRACH communication is a retransmission of the first or initial PRACH communication. The UE may increment the preamble power ramping counter by 1 for the PRACH retransmission regardless of the 1-bit indicator. When there is one indicated joint or uplink TCI state, the UE doesn’ t expect the indicated joint or uplink TCI state to change during the PRACH retransmission, for example, when the 1-bit indicator in PDCCH order DCI indicates that the path loss offset associated with the indicated TCI state is included in the PRACH transmission power or the PRACH transmission is based on the indicated joint or uplink TCI state. When there are two indicated joint or uplink states, the UE doesn’ t expect the first or second joint or uplink TCI state that is indicated in the PDCCH order DCI to change during the PRACH retransmission.
[0141] As shown by reference number reference number 630, the UE may transmit a second PRACH communication (e.g., a retransmission of the first or initial PRACH communication or a second initial transmission of the PRACH communication) in accordance with the type of transmission. In some aspects, the UE may determine whether the second PRACH communication is transmitted autonomously (e.g., without waiting to receive a second PDCCH order) or based at least in part on receiving a second PDCCH order.
[0142] In some aspects, the UE may determine whether the second PRACH communication is transmitted autonomously (e.g., initiated by the UE) or based at least in part on (e.g., triggered by) receiving a second PDCCH order based at least in part on a wireless communication standard. For example, a wireless communication standard may indicate that the second PRACH communication is transmitted autonomously or that the second PRACH communication is transmitted based at least in part on the UE receiving a second PDCCH order.
[0143] Additionally, or alternatively, the UE may determine whether the PRACH communication is transmitted autonomously or based at least in part on receiving a second PDCCH information based at least in part on configuration information. For example, the UE may receive (e.g., via RRC signaling or a MAC CE, among other examples) configuration information indicating that the second PRACH communication is transmitted autonomously or that the second PRACH communication is transmitted based at least in part on the UE receiving a second PDCCH order from the first network node or another wireless communication device.
[0144] In some aspects, the second PDCCH order may indicate whether the second transmission of the PRACH communication is transmitted autonomously or based at least in part on receiving another PDCCH order. For example, the second PDCCH order may include a 1-bit indicator and the UE may determine whether the second transmission of the PRACH communication is transmitted autonomously based at least in part on whether the 1-bit indicator indicates that the PDCCH ordered PRACH communication (e.g., the second transmission of the PRACH communication) follows a joint or uplink TCI state indicated by a beam indication DCI.
[0145] In some aspects, the second transmission of the PRACH communication is transmitted autonomously by the UE based at least in part on the 1-bit indicator indicating that the PDCCH ordered PRACH communication does not follow the joint or uplink TCI state indicated by the beam indication DCI. In some aspects, the second transmission of the PRACH communication is transmitted based at least in part on receiving the second PDCCH order based at least in part on the 1-bit indicator indicating that the PDCCH ordered PRACH communication follows the joint or uplink TCI state indicated by the beam indication DCI.
[0146] As indicated above, Fig. 6 is provided as an example. Other examples may differ from what is described with respect to Fig. 6.
[0147] Fig. 7 is a diagram illustrating an example process 700 performed, for example, at a UE or an apparatus of a UE. Example process 700 is an example where the apparatus or the UE (e.g., UE 120) performs operations associated with power ramp-up for PRACH transmissions.
[0148] As shown in Fig. 7, in some aspects, process 700 may include receiving a PDCCH order associated with a PRACH communication, wherein the PDCCH order includes DCI with a 1-bit indicator, wherein the DCI indicates an SSB and a preamble index (block 710) . For example, the UE (e.g., using reception component 902 or communication manager 906, depicted in Fig. 9) may receive a PDCCH order associated with a PRACH communication, wherein the PDCCH order includes DCI with a 1-bit indicator, wherein the DCI indicates an SSB and a preamble index, as described above.
[0149] As further shown in Fig. 7, in some aspects, process 700 may include performing a first transmission of the PRACH communication based at least in part on the SSB, the preamble index, and the 1-bit indicator (block 720) . For example, the UE (e.g., using communication manager 906, depicted in Fig. 9) may perform a first transmission of the PRACH communication based at least in part on the SSB, the preamble index, and the 1-bit indicator, as described above.
[0150] As further shown in Fig. 7, in some aspects, process 700 may include performing a second transmission of the PRACH communication based at least in part on the SSB, the preamble index, and the 1-bit indicator, and based at least in part on determining that the PRACH communication was not successfully received (block 730) . For example, the UE (e.g., using communication manager 906, depicted in Fig. 9) may perform a second transmission of the PRACH communication based at least in part on the SSB, the preamble index, and the 1-bit indicator, and based at least in part on determining that the PRACH communication was not successfully received, as described above.
[0151] Process 700 may include additional aspects, such as any single aspect or any combination of aspects described below or in connection with one or more other processes described elsewhere herein.
[0152] In a first aspect, the second transmission of the PRACH communication is performed without receiving a PDCCH order associated with the second transmission of the PRACH communication.
[0153] In a second aspect, alone or in combination with the first aspect, the 1-bit indicator indicates whether a PRACH transmission power calculation includes a path loss offset associated with a first joint or uplink TCI state indicated in a beam indication DCI.
[0154] In a third aspect, alone or in combination with one or more of the first and second aspects, a PRACH preamble power ramping counter is incremented by one for the second transmission of the PRACH communication based at least in part on the 1-bit indicator indicating that the path loss offset is not included in the PRACH transmission power calculation or based at least in part on the first transmission of the PRACH communication not being based on the first joint or uplink TCI state.
[0155] In a fourth aspect, alone or in combination with one or more of the first through third aspects, the 1-bit indicator indicates that the path loss offset is included in the PRACH transmission power calculation, and wherein a PRACH preamble power ramping counter is not incremented based at least in part on the first joint or uplink TCI state being changed to a second joint or uplink TCI state, wherein the PRACH preamble power ramping counter is incremented by one when the first joint or uplink TCI state is not changed.
[0156] In a fifth aspect, alone or in combination with one or more of the first through fourth aspects, process 700 includes receiving a beam indication DCI that indicates a first joint or uplink TCI state and a second joint or uplink TCI state, wherein the 1-bit indicator is set to a first value to indicate that a first path loss offset associated with the first joint or uplink transmission TCI state is included in a PRACH transmission power calculation or that the first transmission of the PRACH communication is based at least in part on the first joint or uplink TCI state, and wherein the 1-bit indicator is set to a second value to indicate that a second path loss offset associated with the second joint or uplink transmission TCI state is included in the PRACH transmission power calculation or that the first transmission of the PRACH communication is based at least in part on the second joint or uplink TCI state.
[0157] In a sixth aspect, alone or in combination with one or more of the first through fifth aspects, the 1-bit indicator is set to the first value, and wherein a PRACH preamble power ramping counter is incremented by one for the second transmission of the PRACH communication based at least in part on whether the first joint or uplink TCI state is changed to a third joint or uplink TCI state.
[0158] In a seventh aspect, alone or in combination with one or more of the first through sixth aspects, the 1-bit indicator is set to the second value, and wherein a PRACH preamble power ramping counter is incremented by one for the second transmission of the PRACH communication based at least in part on whether the second joint or uplink TCI state is changed to a third joint or uplink TCI state.
[0159] In an eighth aspect, alone or in combination with one or more of the first through seventh aspects, process 700 includes receiving a beam indication DCI indicates at least one joint or uplink TCI state, wherein the at least one joint or uplink TCI state is configured to remain unchanged during a time period associated with the second transmission of the PRACH communication, and wherein a PRACH preamble power ramping counter is incremented by one for the second transmission of the PRACH communication based at least in part on the at least one joint or uplink TCI state being configured to remain unchanged during the time period.
[0160] In a ninth aspect, alone or in combination with one or more of the first through eighth aspects, process 700 includes receiving another PDCCH order, wherein the second transmission of the PRACH communication is performed based at least in part on the other PDCCH order.
[0161] In a tenth aspect, alone or in combination with one or more of the first through ninth aspects, the other PDCCH order indicates whether the second transmission of the PRACH communication comprises a retransmission of the PRACH communication or an initial transmission of the PRACH communication.
[0162] In an eleventh aspect, alone or in combination with one or more of the first through tenth aspects, the other PDCCH order includes DCI with another 1-bit indicator, and wherein the second transmission of the PRACH communication comprises the retransmission of the PRACH communication or the initial transmission of the PRACH communication based at least in part on whether a value of the 1-bit indicator and a value of the other 1-bit indicator are a same value.
[0163] In a twelfth aspect, alone or in combination with one or more of the first through eleventh aspects, the second transmission of the PRACH communication comprises the retransmission of the PRACH communication based at least in part on the value of the 1-bit indicator and the value of the other 1-bit indicator being the same value, and wherein the second transmission of the PRACH communication comprises the initial transmission of the PRACH communication based at least in part on the value of the 1-bit indicator and the value of the other 1-bit indicator being different values.
[0164] In a thirteenth aspect, alone or in combination with one or more of the first through twelfth aspects, the PDCCH order comprises a 1-bit retransmission indicator, and wherein the second transmission of the PRACH communication comprises the retransmission of the PRACH communication or the initial transmission of the PRACH communication based at least in part on whether the 1-bit retransmission indicator indicates a first value or a second value.
[0165] In a fourteenth aspect, alone or in combination with one or more of the first through thirteenth aspects, the other PDCCH indicates the second transmission of the PRACH communication comprises the retransmission of the PRACH communication and the other PDCCH indicates the SSB and the preamble index indicated by the PDCCH order, wherein the other PDCCH order includes DCI with another 1-bit indicator, wherein a PRACH preamble power ramping counter is incremented by one based at least in part on the other 1-bit indicator being set to a first value, and wherein the second transmission of the PRACH communication is performed based at least in part on incrementing the PRACH preamble power ramping counter.
[0166] In a fifteenth aspect, alone or in combination with one or more of the first through fourteenth aspects, the other PDCCH indicates the second transmission of the PRACH communication comprises the retransmission of the PRACH communication and the other PDCCH order indicates the SSB and the preamble index indicated by the PDCCH order, wherein the other PDCCH order includes DCI with another 1-bit indicator, wherein the other 1-bit indicator is set to a second value, and wherein a PRACH preamble power ramping counter associated with performing the second transmission of the PRACH communication is incremented based at least in part on whether a joint or uplink TCI state indicated in a beam indication DCI is changed or not during the first and the second PRACH transmission.
[0167] In a sixteenth aspect, alone or in combination with one or more of the first through fifteenth aspects, the PRACH preamble power ramping counter is incremented based at least in part on the joint or uplink TCI state indicated in the beam indication DCI being not changed.
[0168] In a seventeenth aspect, alone or in combination with one or more of the first through sixteenth aspects, the UE refrains from incrementing the PRACH preamble power ramping counter based at least in part on the joint or uplink TCI state indicated in the beam indicator DCI being changed to another joint or uplink TCI state.
[0169] In an eighteenth aspect, alone or in combination with one or more of the first through seventeenth aspects, a PRACH preamble power ramping counter is reset based at least in part on the other PDCCH order indicating that the second transmission of the PRACH communication comprises an initial transmission of the PRACH communication.
[0170] In a nineteenth aspect, alone or in combination with one or more of the first through eighteenth aspects, process 700 includes receiving a beam indication DCI that indicates a first joint or uplink TCI state and a second joint or uplink TCI state, wherein the other PDCCH indicates that the second transmission of the PRACH communication comprises the retransmission of the PRACH communication and the other PDCCH order indicates the SSB and the preamble index indicated by the PDCCH order, wherein the other PDCCH order includes DCI with another 1-bit indicator, and wherein a PRACH preamble power ramping counter is incremented based at least in part on whether the first joint or uplink TCI state is changed or not based at least in part on the other 1-bit indicator being set to a first value, or the PRACH preamble power ramping counter is incremented based at least in part on whether the second joint or uplink TCI state is changed or not based at least in part on the other 1-bit indicator being set to a second value.
[0171] In a twentieth aspect, alone or in combination with one or more of the first through nineteenth aspects, the other 1-bit indicator is set to the first value, and wherein the PRACH preamble power ramping counter is incremented based at least in part on the first joint or uplink TCI state being not changed, or wherein the UE refrains from incrementing the PRACH preamble power ramping counter based at least in part on the first joint or uplink TCI state being changed to another joint or uplink TCI state.
[0172] In a twenty-first aspect, alone or in combination with one or more of the first through twentieth aspects, the other 1-bit indicator is set to the second value, and wherein the PRACH preamble power ramping counter is incremented based at least in part on the second joint or uplink TCI state being not changed, or wherein the UE refrains from incrementing the PRACH preamble power ramping counter based at least in part on the second joint or uplink TCI state being changed to another joint or uplink TCI state.
[0173] In a twenty-second aspect, alone or in combination with one or more of the first through twenty-first aspects, the UE determines whether the second transmission of the PRACH communication is initiated by the UE or is triggered by receiving another PDCCH order based at least in part on a wireless communication standard.
[0174] In a twenty-third aspect, alone or in combination with one or more of the first through twenty-second aspects, process 700 includes receiving radio resource control signaling indicating whether the second transmission of the PRACH communication is initiated by the UE or is triggered by receiving another PDCCH order.
[0175] In a twenty-fourth aspect, alone or in combination with one or more of the first through twenty-third aspects, the UE determines whether the second transmission of the PRACH communication is initiated by the UE or is triggered by receiving another PDCCH order based at least in part on whether the 1-bit indicator indicates that the PDCCH ordered PRACH communication follows a joint or uplink TCI state indicated by a beam indication DCI.
[0176] In a twenty-fifth aspect, alone or in combination with one or more of the first through twenty-fourth aspects, the second transmission of the PRACH communication is initiated by the UE based at least in part on the 1-bit indicator indicating that the PDCCH ordered PRACH communication does not follow the joint or uplink TCI state indicated by the beam indication DCI.
[0177] In a twenty-sixth aspect, alone or in combination with one or more of the first through twenty-fifth aspects, the second transmission of the PRACH communication is triggered based at least in part on receiving the other PDCCH order based at least in part on the 1-bit indicator indicating that the PDCCH ordered PRACH communication follows the joint or uplink TCI state indicated by the beam indication DCI.
[0178] Although Fig. 7 shows example blocks of process 700, in some aspects, process 700 may include additional blocks, fewer blocks, different blocks, or differently arranged blocks than those depicted in Fig. 7. Additionally, or alternatively, two or more of the blocks of process 700 may be performed in parallel.
[0179] Fig. 8 is a diagram illustrating an example process 800 performed, for example, at a network node or an apparatus of a network node. Example process 800 is an example where the apparatus or the network node (e.g., network node 110) performs operations associated with power ramp-up for PRACH transmissions.
[0180] As shown in Fig. 8, in some aspects, process 800 may include transmitting a PDCCH order associated with a PRACH communication, wherein the PDCCH order includes DCI with a 1-bit indicator, wherein the DCI indicates an SSB and a preamble index (block 810) . For example, the network node (e.g., using transmission component 1004 or communication manager 1006, depicted in Fig. 10) may transmit a PDCCH order associated with a PRACH communication, wherein the PDCCH order includes DCI with a 1-bit indicator, wherein the DCI indicates an SSB and a preamble index, as described above.
[0181] As further shown in Fig. 8, in some aspects, process 800 may include receiving a transmission of the PRACH communication based at least in part on the SSB, the preamble index, and the 1-bit indicator, wherein the transmission of the PRACH communication comprises a second transmission of the PRACH communication that is transmitted based at least in part on the SSB, the preamble index, and the 1-bit indicator and based at least in part on determining that a first transmission of the PRACH communication was not successfully received by the network node, and wherein the second transmission of the PRACH communication is performed without transmitting a PDCCH order associated with the second transmission of the PRACH communication (block 820) . For example, the network node (e.g., using reception component 1002 or communication manager 1006, depicted in Fig. 10) may receive a transmission of the PRACH communication based at least in part on the SSB, the preamble index, and the 1-bit indicator, wherein the transmission of the PRACH communication comprises a second transmission of the PRACH communication that is transmitted based at least in part on the SSB, the preamble index, and the 1-bit indicator and based at least in part on determining that a first transmission of the PRACH communication was not successfully received by the network node, and wherein the second transmission of the PRACH communication is performed without transmitting a PDCCH order associated with the second transmission of the PRACH communication, as described above.
[0182] Process 800 may include additional aspects, such as any single aspect or any combination of aspects described below or in connection with one or more other processes described elsewhere herein.
[0183] In a first aspect, the 1-bit indicator indicates whether a PRACH transmission power calculation includes a path loss offset associated with a first joint or uplink TCI state indicated in a beam indication DCI.
[0184] In a second aspect, alone or in combination with the first aspect, a PRACH preamble power ramping counter is incremented by one for the second transmission of the PRACH communication based at least in part on the 1-bit indicator indicating that the path loss offset is not included in the PRACH transmission power calculation or based at least in part on the first transmission of the PRACH communication not being based on the first joint or uplink TCI state.
[0185] In a third aspect, alone or in combination with one or more of the first and second aspects, the 1-bit indicator indicates that the path loss offset is included in the PRACH transmission power calculation, and wherein a PRACH preamble power ramping counter is not incremented based at least in part on the first joint or uplink TCI state being changed to a second joint or uplink TCI state, wherein the PRACH preamble power ramping counter is incremented by one when the first joint or uplink TCI state is not changed.
[0186] In a fourth aspect, alone or in combination with one or more of the first through third aspects, process 800 includes transmitting a beam indication DCI that indicates a first joint or uplink TCI state and a second joint or uplink TCI state, wherein the 1-bit indicator is set to a first value to indicate that a first path loss offset associated with the first joint or uplink transmission TCI state is included in a PRACH transmission power calculation or that the first transmission of the PRACH communication is based at least in part on the first joint or uplink TCI state, and wherein the 1-bit indicator is set to a second value to indicate that a second path loss offset associated with the second joint or uplink transmission TCI state is included in the PRACH transmission power calculation or that the first transmission of the PRACH communication is based at least in part on the second joint or uplink TCI state.
[0187] In a fifth aspect, alone or in combination with one or more of the first through fourth aspects, the 1-bit indicator is set to the first value, and wherein a PRACH preamble power ramping counter is incremented by one for the second transmission of the PRACH communication based at least in part on whether the first joint or uplink TCI state is changed to a third joint or uplink TCI state.
[0188] In a sixth aspect, alone or in combination with one or more of the first through fifth aspects, the 1-bit indicator is set to the second value, and wherein a PRACH preamble power ramping counter is incremented by one for the second transmission of the PRACH communication based at least in part on whether the second joint or uplink TCI state is changed to a third joint or uplink TCI state.
[0189] In a seventh aspect, alone or in combination with one or more of the first through sixth aspects, process 800 includes transmitting a beam indication DCI that indicates at least one joint or uplink TCI state, wherein the at least one joint or uplink TCI state is configured to remain unchanged during a time period associated with the second transmission of the PRACH communication, and wherein a PRACH preamble power ramping counter is incremented by one for the retransmission of the PRACH communication based at least in part on the at least one joint or uplink TCI state being configured to remain unchanged during the time period.
[0190] In an eighth aspect, alone or in combination with one or more of the first through seventh aspects, process 800 includes transmitting another PDCCH order, wherein the second transmission of the PRACH communication is performed based at least in part on the other PDCCH order.
[0191] In a ninth aspect, alone or in combination with one or more of the first through eighth aspects, the other PDCCH order indicates whether the second transmission of the PRACH communication comprises a retransmission of the PRACH communication or an initial transmission of the PRACH communication.
[0192] In a tenth aspect, alone or in combination with one or more of the first through ninth aspects, the other PDCCH order includes DCI with another 1-bit indicator, and wherein the second transmission of the PRACH communication comprises the retransmission of the PRACH communication or the initial transmission of the PRACH communication based at least in part on whether a value of the 1-bit indicator and a value of the other 1-bit indicator are a same value.
[0193] In an eleventh aspect, alone or in combination with one or more of the first through tenth aspects, the second transmission of the PRACH communication comprises the retransmission of the PRACH communication based at least in part on the value of the 1-bit indicator and the value of the other 1-bit indicator being the same value, and wherein the second transmission of the PRACH communication comprises the initial transmission of the PRACH communication based at least in part on the value of the 1-bit indicator and the value of the other 1-bit indicator being different values.
[0194] In a twelfth aspect, alone or in combination with one or more of the first through eleventh aspects, the PDCCH comprises a 1-bit retransmission indicator, and wherein the second transmission of the PRACH communication comprises the retransmission of the PRACH communication or the initial transmission of the PRACH communication based at least in part on whether the 1-bit retransmission indicator indicates a first value or a second value.
[0195] In a thirteenth aspect, alone or in combination with one or more of the first through twelfth aspects, the other PDCCH indicates that the second transmission of the PRACH communication comprises the retransmission of the PRACH communication and the other PDCCH indicates the SSB and the preamble index indicated by the PDCCH order, wherein the other PDCCH order includes DCI with another 1-bit indicator, wherein a PRACH preamble power ramping counter is incremented based at least in part on the other 1-bit indicator being set to a first value, and wherein the second transmission of the PRACH communication is performed based at least in part on incrementing the PRACH preamble power ramping counter.
[0196] In a fourteenth aspect, alone or in combination with one or more of the first through thirteenth aspects, the other PDCCH indicates that the second transmission of the PRACH communication comprises the retransmission of the PRACH communication and the other PDCCH order indicates the SSB and the preamble index indicated by the PDCCH order, wherein the other PDCCH order includes DCI with another 1-bit indicator, wherein the other 1-bit indicator is set to a second value, and wherein a PRACH preamble power ramping counter associated with performing the second transmission of the PRACH communication is incremented based at least in part on whether a joint or uplink TCI state indicated in a beam indication DCI is changed with respect to the first transmission of the PRACH communication and the second transmission of the PRACH communication.
[0197] In a fifteenth aspect, alone or in combination with one or more of the first through fourteenth aspects, the PRACH preamble power ramping counter is incremented based at least in part on the joint or uplink TCI state indicated in the beam indication DCI not being changed.
[0198] In a sixteenth aspect, alone or in combination with one or more of the first through fifteenth aspects, the UE refrains from incrementing the PRACH preamble power ramping counter based at least in part on the joint or uplink TCI state indicated in the beam indication DCI being changed to another joint or uplink TCI state.
[0199] In a seventeenth aspect, alone or in combination with one or more of the first through sixteenth aspects, a PRACH preamble power ramping counter is reset based at least in part on the other PDCCH order indicating that the second transmission of the PRACH communication comprises an initial transmission of the PRACH communication.
[0200] In an eighteenth aspect, alone or in combination with one or more of the first through seventeenth aspects, process 800 includes transmitting a beam indication DCI that indicates a first joint or uplink TCI state and a second joint or uplink TCI state, wherein the other PDCCH indicates that the second transmission of the PRACH communication comprises the retransmission of the PRACH communication and the other PDCCH order indicates the SSB and the preamble index indicated by the PDCCH order, wherein the other PDCCH order includes DCI with another 1-bit indicator, and wherein a PRACH preamble power ramping counter is incremented based at least in part on whether the first joint or uplink TCI state is changed or not based at least in part on the other 1-bit indicator being set to a first value, or the PRACH preamble power ramping counter is incremented based at least in part on whether the second joint or uplink TCI state is changed or not based at least in part on the other 1-bit indicator being set to a second value.
[0201] In a nineteenth aspect, alone or in combination with one or more of the first through eighteenth aspects, the other 1-bit indicator is set to the first value, and wherein the PRACH preamble power ramping counter is incremented based at least in part on the first joint or uplink TCI state being not changed, or wherein the UE refrains from incrementing the PRACH preamble power ramping counter based at least in part on the first joint or uplink TCI state being changed to another joint or uplink TCI state.
[0202] In a twentieth aspect, alone or in combination with one or more of the first through nineteenth aspects, the other 1-bit indicator is set to the second value, and wherein the PRACH preamble power ramping counter is incremented based at least in part on the second joint or uplink TCI state being the same as the fourth joint or uplink TCI state, or wherein the UE refrains from incrementing the PRACH preamble power ramping counter based at least in part on the second joint or uplink TCI state being different from the fourth joint or uplink TCI state.
[0203] In a twenty-first aspect, alone or in combination with one or more of the first through twentieth aspects, whether the second transmission of the PRACH communication is triggered by receiving another PDCCH order based at least in part on a wireless communication standard.
[0204] In a twenty-second aspect, alone or in combination with one or more of the first through twenty-first aspects, process 800 includes transmitting radio resource control signaling indicating whether the second transmission of the PRACH communication is triggered by receiving another PDCCH order.
[0205] In a twenty-third aspect, alone or in combination with one or more of the first through twenty-second aspects, whether the second transmission of the PRACH communication is initiated by transmitting another PDCCH order is based at least in part on whether the 1-bit indicator indicates that the PDCCH ordered PRACH communication follows a joint or uplink TCI state indicated by a beam indication DCI.
[0206] In a twenty-fourth aspect, alone or in combination with one or more of the first through twenty-third aspects, the second transmission of the PRACH communication is initiated by a UE based at least in part on the 1-bit indicator indicating that the PDCCH ordered PRACH communication does not follow the joint or uplink TCI state indicated by the beam indication DCI.
[0207] In a twenty-fifth aspect, alone or in combination with one or more of the first through twenty-fourth aspects, the second transmission of the PRACH communication is triggered based at least in part on transmitting the other PDCCH order based at least in part on the 1-bit indicator indicating that the PDCCH ordered PRACH communication follows the joint or uplink TCI state indicated by the beam indication DCI.
[0208] Although Fig. 8 shows example blocks of process 800, in some aspects, process 800 may include additional blocks, fewer blocks, different blocks, or differently arranged blocks than those depicted in Fig. 8. Additionally, or alternatively, two or more of the blocks of process 800 may be performed in parallel.
[0209] Fig. 9 is a diagram of an example apparatus 900 for wireless communication. The apparatus 900 may be a UE, or a UE may include the apparatus 900. In some aspects, the apparatus 900 includes a reception component 902, a transmission component 904, or a communication manager 906, which may be in communication with one another (for example, via one or more buses or one or more other components) . In some aspects, the communication manager 906 is the communication manager 150 described in connection with Fig. 1. As shown, the apparatus 900 may communicate with another apparatus 908, such as a UE or a network node (such as a CU, a DU, an RU, or a base station) , using the reception component 902 and the transmission component 904. The communication manager 906 may be included in, or implemented via, a processing system (for example, the processing system 140 described in connection with Fig. 1) of the UE.
[0210] In some aspects, the apparatus 900 may be configured to perform one or more operations described herein in connection with Figs. 2-6. Additionally, or alternatively, the apparatus 900 may be configured to perform one or more processes described herein, such as process 700 of Fig. 7. In some aspects, the apparatus 900 or one or more components shown in Fig. 9 may include one or more components of the UE described in connection with Fig. 1. Additionally, or alternatively, one or more components shown in Fig. 9 may be implemented within one or more components described in connection with Fig. 1. Additionally, or alternatively, one or more components of the set of components may be implemented at least in part as software stored in one or more memories. For example, a component (or a portion of a component) may be implemented as instructions or code stored in a non-transitory computer-readable medium and executable by one or more controllers or one or more processors to perform the functions or operations of the component.
[0211] The reception component 902 may receive communications, such as reference signals, control information, data communications, or a combination thereof, from the apparatus 908. The reception component 902 may provide received communications to one or more other components of the apparatus 900. In some aspects, the reception component 902 may perform signal processing on the received communications, and may provide the processed signals to the one or more other components of the apparatus 900. In some aspects, the reception component 902 may include one or more components of the UE described above in connection with Fig. 1, such as a radio, one or more RF chains, one or more transceivers, or one or more modems, each of which may in turn be coupled with one or more antennas of the UE.
[0212] The transmission component 904 may transmit communications, such as reference signals, control information, data communications, or a combination thereof, to the apparatus 908. In some aspects, one or more other components of the apparatus 900 may generate communications and may provide the generated communications to the transmission component 904 for transmission to the apparatus 908. In some aspects, the transmission component 904 may perform signal processing on the generated communications, and may transmit the processed signals to the apparatus 908. In some aspects, the transmission component 904 may include one or more components of the UE described above in connection with Fig. 1, such as a radio, one or more RF chains, one or more transceivers, or one or more modems, each of which may in turn be coupled with one or more antennas of the UE described in connection with Fig. 1. In some aspects, the transmission component 904 may be co-located with the reception component 902.
[0213] The communication manager 906 may support operations of the reception component 902 or the transmission component 904. For example, the communication manager 906 may receive information associated with configuring reception of communications by the reception component 902 or transmission of communications by the transmission component 904. Additionally, or alternatively, the communication manager 906 may generate or provide control information to the reception component 902 or the transmission component 904 to control reception or transmission of communications.
[0214] The reception component 902 may receive a PDCCH order associated with a PRACH communication, wherein the PDCCH order includes DCI with a 1-bit indicator, wherein the DCI indicates an SSB and a preamble index. The communication manager 906 may perform a first transmission of the PRACH communication based at least in part on the SSB, the preamble index, and the 1-bit indicator. The communication manager 906 may perform a second transmission of the PRACH communication based at least in part on the SSB, the preamble index, and the 1-bit indicator, and based at least in part on determining that the PRACH communication was not successfully received.
[0215] The reception component 902 may receive a beam indication DCI that indicates a first joint or uplink TCI state and a second joint or uplink TCI state, wherein the 1-bit indicator is set to a first value to indicate that a first path loss offset associated with the first joint or uplink transmission TCI state is included in a PRACH transmission power calculation or that the first transmission of the PRACH communication is based at least in part on the first joint or uplink TCI state, and wherein the 1-bit indicator is set to a second value to indicate that a second path loss offset associated with the second joint or uplink transmission TCI state is included in the PRACH transmission power calculation or that the first transmission of the PRACH communication is based at least in part on the second joint or uplink TCI state.
[0216] The reception component 902 may receive a beam indication DCI indicates at least one joint or uplink TCI state, wherein the at least one joint or uplink TCI state is configured to remain unchanged during a time period associated with the second transmission of the PRACH communication, and wherein a PRACH preamble power ramping counter is incremented by one for the second transmission of the PRACH communication based at least in part on the at least one joint or uplink TCI state being configured to remain unchanged during the time period.
[0217] The reception component 902 may receive another PDCCH order, wherein the second transmission of the PRACH communication is performed based at least in part on the other PDCCH order.
[0218] The reception component 902 may receive a beam indication DCI that indicates a first joint or uplink TCI state and a second joint or uplink TCI state, wherein the other PDCCH indicates that the second transmission of the PRACH communication comprises the retransmission of the PRACH communication and the other PDCCH order indicates the SSB and the preamble index indicated by the PDCCH order, wherein the other PDCCH order includes DCI with another 1-bit indicator, and wherein a PRACH preamble power ramping counter is incremented based at least in part on whether the first joint or uplink TCI state is changed or not based at least in part on the other 1-bit indicator being set to a first value, or the PRACH preamble power ramping counter is incremented based at least in part on whether the second joint or uplink TCI state is changed or not based at least in part on the other 1-bit indicator being set to a second value.
[0219] The reception component 902 may receive radio resource control signaling indicating whether the second transmission of the PRACH communication is initiated by the UE or is triggered by receiving another PDCCH order.
[0220] The number and arrangement of components shown in Fig. 9 are provided as an example. In practice, there may be additional components, fewer components, different components, or differently arranged components than those shown in Fig. 9. Furthermore, two or more components shown in Fig. 9 may be implemented within a single component, or a single component shown in Fig. 9 may be implemented as multiple, distributed components. Additionally, or alternatively, a set of (one or more) components shown in Fig. 9 may perform one or more functions described as being performed by another set of components shown in Fig. 9.
[0221] Fig. 10 is a diagram of an example apparatus 1000 for wireless communication. The apparatus 1000 may be a network node, or a network node may include the apparatus 1000. In some aspects, the apparatus 1000 includes a reception component 1002, a transmission component 1004, or a communication manager 1006, which may be in communication with one another (for example, via one or more buses or one or more other components) . In some aspects, the communication manager 1006 is the communication manager 155 described in connection with Fig. 1. As shown, the apparatus 1000 may communicate with another apparatus 1008, such as a UE or a network node (such as a CU, a DU, an RU, or a base station) , using the reception component 1002 and the transmission component 1004. The communication manager 1006 may be included in, or implemented via, a processing system (for example, the processing system 145 described in connection with Fig. 1) of the network node.
[0222] In some aspects, the apparatus 1000 may be configured to perform one or more operations described herein in connection with Figs. 2-6. Additionally, or alternatively, the apparatus 1000 may be configured to perform one or more processes described herein, such as process 800 of Fig. 8. In some aspects, the apparatus 1000 or one or more components shown in Fig. 10 may include one or more components of the network node described in connection with Fig. 1. Additionally, or alternatively, one or more components shown in Fig. 10 may be implemented within one or more components described in connection with Fig. 1. Additionally, or alternatively, one or more components of the set of components may be implemented at least in part as software stored in one or more memories. For example, a component (or a portion of a component) may be implemented as instructions or code stored in a non-transitory computer-readable medium and executable by one or more controllers or one or more processors to perform the functions or operations of the component.
[0223] The reception component 1002 may receive communications, such as reference signals, control information, data communications, or a combination thereof, from the apparatus 1008. The reception component 1002 may provide received communications to one or more other components of the apparatus 1000. In some aspects, the reception component 1002 may perform signal processing on the received communications, and may provide the processed signals to the one or more other components of the apparatus 1000. In some aspects, the reception component 1002 may include one or more components of the network node described above in connection with Fig. 1, such as a radio, one or more RF chains, one or more transceivers, or one or more modems, each of which may in turn be coupled with one or more antennas of the network node. In some aspects, the reception component 1002 or the transmission component 1004 may include or may be included in a network interface. The network interface may be configured to obtain or output signals for the apparatus 1000 via one or more communications links, such as a backhaul link, a midhaul link, or a fronthaul link.
[0224] The transmission component 1004 may transmit communications, such as reference signals, control information, data communications, or a combination thereof, to the apparatus 1008. In some aspects, one or more other components of the apparatus 1000 may generate communications and may provide the generated communications to the transmission component 1004 for transmission to the apparatus 1008. In some aspects, the transmission component 1004 may perform signal processing on the generated communications, and may transmit the processed signals to the apparatus 1008. In some aspects, the transmission component 1004 may include one or more components of the network node described above in connection with Fig. 1, such as a radio, one or more RF chains, one or more transceivers, or one or more modems, each of which may in turn be coupled with one or more antennas of the network node described in connection with Fig. 1. In some aspects, the transmission component 1004 may be co-located with the reception component 1002.
[0225] The communication manager 1006 may support operations of the reception component 1002 or the transmission component 1004. For example, the communication manager 1006 may receive information associated with configuring reception of communications by the reception component 1002 or transmission of communications by the transmission component 1004. Additionally, or alternatively, the communication manager 1006 may generate or provide control information to the reception component 1002 or the transmission component 1004 to control reception or transmission of communications.
[0226] The transmission component 1004 may transmit a PDCCH order associated with a PRACH communication, wherein the PDCCH order includes DCI with a 1-bit indicator, wherein the DCI indicates an SSB and a preamble index. The reception component 1002 may receive a transmission of the PRACH communication based at least in part on the SSB, the preamble index, and the 1-bit indicator, wherein the transmission of the PRACH communication comprises a second transmission of the PRACH communication that is transmitted based at least in part on the SSB, the preamble index, and the 1-bit indicator and based at least in part on determining that a first transmission of the PRACH communication was not successfully received by the network node, and wherein the second transmission of the PRACH communication is performed without transmitting a PDCCH order associated with the second transmission of the PRACH communication.
[0227] The transmission component 1004 may transmit a beam indication DCI that indicates a first joint or uplink TCI state and a second joint or uplink TCI state, wherein the 1-bit indicator is set to a first value to indicate that a first path loss offset associated with the first joint or uplink transmission TCI state is included in a PRACH transmission power calculation or that the first transmission of the PRACH communication is based at least in part on the first joint or uplink TCI state, and wherein the 1-bit indicator is set to a second value to indicate that a second path loss offset associated with the second joint or uplink transmission TCI state is included in the PRACH transmission power calculation or that the first transmission of the PRACH communication is based at least in part on the second joint or uplink TCI state.
[0228] The transmission component 1004 may transmit a beam indication DCI that indicates at least one joint or uplink TCI state, wherein the at least one joint or uplink TCI state is configured to remain unchanged during a time period associated with the second transmission of the PRACH communication, and wherein a PRACH preamble power ramping counter is incremented by one for the retransmission of the PRACH communication based at least in part on the at least one joint or uplink TCI state being configured to remain unchanged during the time period.
[0229] The transmission component 1004 may transmit another PDCCH order, wherein the second transmission of the PRACH communication is performed based at least in part on the other PDCCH order.
[0230] The transmission component 1004 may transmit a beam indication DCI that indicates a first joint or uplink TCI state and a second joint or uplink TCI state, wherein the other PDCCH indicates that the second transmission of the PRACH communication comprises the retransmission of the PRACH communication and the other PDCCH order indicates the SSB and the preamble index indicated by the PDCCH order, wherein the other PDCCH order includes DCI with another 1-bit indicator, and wherein a PRACH preamble power ramping counter is incremented based at least in part on whether the first joint or uplink TCI state is changed or not based at least in part on the other 1-bit indicator being set to a first value, or the PRACH preamble power ramping counter is incremented based at least in part on whether the second joint or uplink TCI state is changed or not based at least in part on the other 1-bit indicator being set to a second value.
[0231] The transmission component 1004 may transmit radio resource control signaling indicating whether the second transmission of the PRACH communication is triggered by receiving another PDCCH order.
[0232] The number and arrangement of components shown in Fig. 10 are provided as an example. In practice, there may be additional components, fewer components, different components, or differently arranged components than those shown in Fig. 10. Furthermore, two or more components shown in Fig. 10 may be implemented within a single component, or a single component shown in Fig. 10 may be implemented as multiple, distributed components. Additionally, or alternatively, a set of (one or more) components shown in Fig. 10 may perform one or more functions described as being performed by another set of components shown in Fig. 10.
[0233] The following provides an overview of some Aspects of the present disclosure:
[0234] Aspect 1: A method of wireless communication performed by a UE, comprising: receiving a PDCCH order associated with a PRACH communication, wherein the PDCCH order includes DCI with a 1-bit indicator, wherein the DCI indicates an SSB and a preamble index; performing a first transmission of the PRACH communication based at least in part on the SSB, the preamble index, and the 1-bit indicator; and performing a second transmission of the PRACH communication based at least in part on the SSB, the preamble index, and the 1-bit indicator, and based at least in part on determining that the PRACH communication was not successfully received.
[0235] Aspect 2: The method of Aspect 1, wherein the second transmission of the PRACH communication is performed without receiving a PDCCH order associated with the second transmission of the PRACH communication.
[0236] Aspect 3: The method of any of Aspects 1-2, wherein the 1-bit indicator indicates whether a PRACH transmission power calculation includes a path loss offset associated with a first joint or uplink TCI state indicated in a beam indication DCI.
[0237] Aspect 4: The method of Aspect 3, wherein a PRACH preamble power ramping counter is incremented by one for the second transmission of the PRACH communication based at least in part on the 1-bit indicator indicating that the path loss offset is not included in the PRACH transmission power calculation or based at least in part on the first transmission of the PRACH communication not being based on the first joint or uplink TCI state.
[0238] Aspect 5: The method of Aspect 3, wherein the 1-bit indicator indicates that the path loss offset is included in the PRACH transmission power calculation, and wherein a PRACH preamble power ramping counter is not incremented based at least in part on the first joint or uplink TCI state being changed to a second joint or uplink TCI state, wherein the PRACH preamble power ramping counter is incremented by one when the first joint or uplink TCI state is not changed.
[0239] Aspect 6: The method of any of Aspects 1-5, further comprising: receiving a beam indication DCI that indicates a first joint or uplink TCI state and a second joint or uplink TCI state, wherein the 1-bit indicator is set to a first value to indicate that a first path loss offset associated with the first joint or uplink transmission TCI state is included in a PRACH transmission power calculation or that the first transmission of the PRACH communication is based at least in part on the first joint or uplink TCI state, and wherein the 1-bit indicator is set to a second value to indicate that a second path loss offset associated with the second joint or uplink transmission TCI state is included in the PRACH transmission power calculation or that the first transmission of the PRACH communication is based at least in part on the second joint or uplink TCI state.
[0240] Aspect 7: The method of Aspect 6, wherein the 1-bit indicator is set to the first value, and wherein a PRACH preamble power ramping counter is incremented by one for the second transmission of the PRACH communication based at least in part on whether the first joint or uplink TCI state is changed to a third joint or uplink TCI state.
[0241] Aspect 8: The method of Aspect 6, wherein the 1-bit indicator is set to the second value, and wherein a PRACH preamble power ramping counter is incremented by one for the second transmission of the PRACH communication based at least in part on whether the second joint or uplink TCI state is changed to a third joint or uplink TCI state.
[0242] Aspect 9: The method of any of Aspects 1-8, further comprising: receiving a beam indication DCI indicates at least one joint or uplink TCI state, wherein the at least one joint or uplink TCI state is configured to remain unchanged during a time period associated with the second transmission of the PRACH communication, and wherein a PRACH preamble power ramping counter is incremented by one for the second transmission of the PRACH communication based at least in part on the at least one joint or uplink TCI state being configured to remain unchanged during the time period.
[0243] Aspect 10: The method of any of Aspects 1-9, further comprising: receiving another PDCCH order, wherein the second transmission of the PRACH communication is performed based at least in part on the other PDCCH order.
[0244] Aspect 11: The method of Aspect 10, wherein the other PDCCH order indicates whether the second transmission of the PRACH communication comprises a retransmission of the PRACH communication or an initial transmission of the PRACH communication.
[0245] Aspect 12: The method of Aspect 11, wherein the other PDCCH order includes DCI with another 1-bit indicator, and wherein the second transmission of the PRACH communication comprises the retransmission of the PRACH communication or the initial transmission of the PRACH communication based at least in part on whether a value of the 1-bit indicator and a value of the other 1-bit indicator are a same value.
[0246] Aspect 13: The method of Aspect 12, wherein the second transmission of the PRACH communication comprises the retransmission of the PRACH communication based at least in part on the value of the 1-bit indicator and the value of the other 1-bit indicator being the same value, and wherein the second transmission of the PRACH communication comprises the initial transmission of the PRACH communication based at least in part on the value of the 1-bit indicator and the value of the other 1-bit indicator being different values.
[0247] Aspect 14: The method of Aspect 11, wherein the PDCCH order comprises a 1-bit retransmission indicator, and wherein the second transmission of the PRACH communication comprises the retransmission of the PRACH communication or the initial transmission of the PRACH communication based at least in part on whether the 1-bit retransmission indicator indicates a first value or a second value.
[0248] Aspect 15: The method of Aspect 10, wherein the other PDCCH indicates the second transmission of the PRACH communication comprises the retransmission of the PRACH communication and the other PDCCH indicates the SSB and the preamble index indicated by the PDCCH order, wherein the other PDCCH order includes DCI with another 1-bit indicator, wherein a PRACH preamble power ramping counter is incremented by one based at least in part on the other 1-bit indicator being set to a first value, and wherein the second transmission of the PRACH communication is performed based at least in part on incrementing the PRACH preamble power ramping counter.
[0249] Aspect 16: The method of Aspect 10, wherein the other PDCCH indicates the second transmission of the PRACH communication comprises the retransmission of the PRACH communication and the other PDCCH order indicates the SSB and the preamble index indicated by the PDCCH order, wherein the other PDCCH order includes DCI with another 1-bit indicator, wherein the other 1-bit indicator is set to a second value, and wherein a PRACH preamble power ramping counter associated with performing the second transmission of the PRACH communication is incremented based at least in part on whether a joint or uplink TCI state indicated in a beam indication DCI is changed or not during the first and the second PRACH transmission.
[0250] Aspect 17: The method of Aspect 16, wherein the PRACH preamble power ramping counter is incremented based at least in part on the joint or uplink TCI state indicated in the beam indication DCI being not changed.
[0251] Aspect 18: The method of Aspect 16, wherein the UE refrains from incrementing the PRACH preamble power ramping counter based at least in part on the joint or uplink TCI state indicated in the beam indicator DCI being changed to another joint or uplink TCI state.
[0252] Aspect 19: The method of Aspect 10, wherein a PRACH preamble power ramping counter is reset based at least in part on the other PDCCH order indicating that the second transmission of the PRACH communication comprises an initial transmission of the PRACH communication.
[0253] Aspect 20: The method of Aspect 10, further comprising: receiving a beam indication DCI that indicates a first joint or uplink TCI state and a second joint or uplink TCI state, wherein the other PDCCH indicates that the second transmission of the PRACH communication comprises the retransmission of the PRACH communication and the other PDCCH order indicates the SSB and the preamble index indicated by the PDCCH order, wherein the other PDCCH order includes DCI with another 1-bit indicator, and wherein a PRACH preamble power ramping counter is incremented based at least in part on whether the first joint or uplink TCI state is changed or not based at least in part on the other 1-bit indicator being set to a first value, or the PRACH preamble power ramping counter is incremented based at least in part on whether the second joint or uplink TCI state is changed or not based at least in part on the other 1-bit indicator being set to a second value.
[0254] Aspect 21: The method of Aspect 20, wherein the other 1-bit indicator is set to the first value, and wherein the PRACH preamble power ramping counter is incremented based at least in part on the first joint or uplink TCI state being not changed, or wherein the UE refrains from incrementing the PRACH preamble power ramping counter based at least in part on the first joint or uplink TCI state being changed to another joint or uplink TCI state.
[0255] Aspect 22: The method of Aspect 20, wherein the other 1-bit indicator is set to the second value, and wherein the PRACH preamble power ramping counter is incremented based at least in part on the second joint or uplink TCI state being not changed, or wherein the UE refrains from incrementing the PRACH preamble power ramping counter based at least in part on the second joint or uplink TCI state being changed to another joint or uplink TCI state.
[0256] Aspect 23: The method of any of Aspects 1-22, wherein the UE determines whether the second transmission of the PRACH communication is initiated by the UE or is triggered by receiving another PDCCH order based at least in part on a wireless communication standard.
[0257] Aspect 24: The method of any of Aspects 1-23, further comprising: receiving radio resource control signaling indicating whether the second transmission of the PRACH communication is initiated by the UE or is triggered by receiving another PDCCH order.
[0258] Aspect 25: The method of any of Aspects 1-24, wherein the UE determines whether the second transmission of the PRACH communication is initiated by the UE or is triggered by receiving another PDCCH order based at least in part on whether the 1-bit indicator indicates that the PDCCH ordered PRACH communication follows a joint or uplink TCI state indicated by a beam indication DCI.
[0259] Aspect 26: The method of Aspect 25, wherein the second transmission of the PRACH communication is initiated by the UE based at least in part on the 1-bit indicator indicating that the PDCCH ordered PRACH communication does not follow the joint or uplink TCI state indicated by the beam indication DCI.
[0260] Aspect 27: The method of Aspect 25, wherein the second transmission of the PRACH communication is triggered based at least in part on receiving the other PDCCH order based at least in part on the 1-bit indicator indicating that the PDCCH ordered PRACH communication follows the joint or uplink TCI state indicated by the beam indication DCI.
[0261] Aspect 28: A method of wireless communication performed by a network node, comprising: transmitting a PDCCH order associated with a PRACH communication, wherein the PDCCH order includes DCI with a 1-bit indicator, wherein the DCI indicates an SSB and a preamble index; and receiving a transmission of the PRACH communication based at least in part on the SSB, the preamble index, and the 1-bit indicator, wherein the transmission of the PRACH communication comprises a second transmission of the PRACH communication that is transmitted based at least in part on the SSB, the preamble index, and the 1-bit indicator and based at least in part on determining that a first transmission of the PRACH communication was not successfully received by the network node, and wherein the second transmission of the PRACH communication is performed without transmitting a PDCCH order associated with the second transmission of the PRACH communication.
[0262] Aspect 29: The method of Aspect 28, wherein the 1-bit indicator indicates whether a PRACH transmission power calculation includes a path loss offset associated with a first joint or uplink TCI state indicated in a beam indication DCI.
[0263] Aspect 30: The method of Aspect 29, wherein a PRACH preamble power ramping counter is incremented by one for the second transmission of the PRACH communication based at least in part on the 1-bit indicator indicating that the path loss offset is not included in the PRACH transmission power calculation or based at least in part on the first transmission of the PRACH communication not being based on the first joint or uplink TCI state.
[0264] Aspect 31: The method of Aspect 29, wherein the 1-bit indicator indicates that the path loss offset is included in the PRACH transmission power calculation, and wherein a PRACH preamble power ramping counter is not incremented based at least in part on the first joint or uplink TCI state being changed to a second joint or uplink TCI state, wherein the PRACH preamble power ramping counter is incremented by one when the first joint or uplink TCI state is not changed.
[0265] Aspect 32: The method of any of Aspects 28-31, further comprising: transmitting a beam indication DCI that indicates a first joint or uplink TCI state and a second joint or uplink TCI state, wherein the 1-bit indicator is set to a first value to indicate that a first path loss offset associated with the first joint or uplink transmission TCI state is included in a PRACH transmission power calculation or that the first transmission of the PRACH communication is based at least in part on the first joint or uplink TCI state, and wherein the 1-bit indicator is set to a second value to indicate that a second path loss offset associated with the second joint or uplink transmission TCI state is included in the PRACH transmission power calculation or that the first transmission of the PRACH communication is based at least in part on the second joint or uplink TCI state.
[0266] Aspect 33: The method of Aspect 32, wherein the 1-bit indicator is set to the first value, and wherein a PRACH preamble power ramping counter is incremented by one for the second transmission of the PRACH communication based at least in part on whether the first joint or uplink TCI state is changed to a third joint or uplink TCI state.
[0267] Aspect 34: The method of Aspect 32, wherein the 1-bit indicator is set to the second value, and wherein a PRACH preamble power ramping counter is incremented by one for the second transmission of the PRACH communication based at least in part on whether the second joint or uplink TCI state is changed to a third joint or uplink TCI state.
[0268] Aspect 35: The method of any of Aspects 28-34, further comprising: transmitting a beam indication DCI that indicates at least one joint or uplink TCI state, wherein the at least one joint or uplink TCI state is configured to remain unchanged during a time period associated with the second transmission of the PRACH communication, and wherein a PRACH preamble power ramping counter is incremented by one for the retransmission of the PRACH communication based at least in part on the at least one joint or uplink TCI state being configured to remain unchanged during the time period.
[0269] Aspect 36: The method of any of Aspects 28-35, further comprising: transmitting another PDCCH order, wherein the second transmission of the PRACH communication is performed based at least in part on the other PDCCH order.
[0270] Aspect 37: The method of Aspect 36, wherein the other PDCCH order indicates whether the second transmission of the PRACH communication comprises a retransmission of the PRACH communication or an initial transmission of the PRACH communication.
[0271] Aspect 38: The method of Aspect 37, wherein the other PDCCH order includes DCI with another 1-bit indicator, and wherein the second transmission of the PRACH communication comprises the retransmission of the PRACH communication or the initial transmission of the PRACH communication based at least in part on whether a value of the 1-bit indicator and a value of the other 1-bit indicator are a same value.
[0272] Aspect 39: The method of Aspect 38, wherein the second transmission of the PRACH communication comprises the retransmission of the PRACH communication based at least in part on the value of the 1-bit indicator and the value of the other 1-bit indicator being the same value, and wherein the second transmission of the PRACH communication comprises the initial transmission of the PRACH communication based at least in part on the value of the 1-bit indicator and the value of the other 1-bit indicator being different values.
[0273] Aspect 40: The method of Aspect 37, wherein the PDCCH comprises a 1-bit retransmission indicator, and wherein the second transmission of the PRACH communication comprises the retransmission of the PRACH communication or the initial transmission of the PRACH communication based at least in part on whether the 1-bit retransmission indicator indicates a first value or a second value.
[0274] Aspect 41: The method of Aspect 36, wherein the other PDCCH indicates that the second transmission of the PRACH communication comprises the retransmission of the PRACH communication and the other PDCCH indicates the SSB and the preamble index indicated by the PDCCH order, wherein the other PDCCH order includes DCI with another 1-bit indicator, wherein a PRACH preamble power ramping counter is incremented based at least in part on the other 1-bit indicator being set to a first value, and wherein the second transmission of the PRACH communication is performed based at least in part on incrementing the PRACH preamble power ramping counter.
[0275] Aspect 42: The method of Aspect 36, wherein the other PDCCH indicates that the second transmission of the PRACH communication comprises the retransmission of the PRACH communication and the other PDCCH order indicates the SSB and the preamble index indicated by the PDCCH order, wherein the other PDCCH order includes DCI with another 1-bit indicator, wherein the other 1-bit indicator is set to a second value, and wherein a PRACH preamble power ramping counter associated with performing the second transmission of the PRACH communication is incremented based at least in part on whether a joint or uplink TCI state indicated in a beam indication DCI is changed with respect to the first transmission of the PRACH communication and the second transmission of the PRACH communication.
[0276] Aspect 43: The method of Aspect 42, wherein the PRACH preamble power ramping counter is incremented based at least in part on the joint or uplink TCI state indicated in the beam indication DCI not being changed.
[0277] Aspect 44: The method of Aspect 42, wherein the UE refrains from incrementing the PRACH preamble power ramping counter based at least in part on the joint or uplink TCI state indicated in the beam indication DCI being changed to another joint or uplink TCI state.
[0278] Aspect 45: The method of Aspect 36, wherein a PRACH preamble power ramping counter is reset based at least in part on the other PDCCH order indicating that the second transmission of the PRACH communication comprises an initial transmission of the PRACH communication.
[0279] Aspect 46: The method of Aspect 36, further comprising: transmitting a beam indication DCI that indicates a first joint or uplink TCI state and a second joint or uplink TCI state, wherein the other PDCCH indicates that the second transmission of the PRACH communication comprises the retransmission of the PRACH communication and the other PDCCH order indicates the SSB and the preamble index indicated by the PDCCH order, wherein the other PDCCH order includes DCI with another 1-bit indicator, and wherein a PRACH preamble power ramping counter is incremented based at least in part on whether the first joint or uplink TCI state is changed or not based at least in part on the other 1-bit indicator being set to a first value, or the PRACH preamble power ramping counter is incremented based at least in part on whether the second joint or uplink TCI state is changed or not based at least in part on the other 1-bit indicator being set to a second value.
[0280] Aspect 47: The method of Aspect 46, wherein the other 1-bit indicator is set to the first value, and wherein the PRACH preamble power ramping counter is incremented based at least in part on the first joint or uplink TCI state being not changed, or wherein the UE refrains from incrementing the PRACH preamble power ramping counter based at least in part on the first joint or uplink TCI state being changed to another joint or uplink TCI state.
[0281] Aspect 48: The method of Aspect 46, wherein the other 1-bit indicator is set to the second value, and wherein the PRACH preamble power ramping counter is incremented based at least in part on the second joint or uplink TCI state being the same as the fourth joint or uplink TCI state, or wherein the UE refrains from incrementing the PRACH preamble power ramping counter based at least in part on the second joint or uplink TCI state being different from the fourth joint or uplink TCI state.
[0282] Aspect 49: The method of any of Aspects 28-48, wherein whether the second transmission of the PRACH communication is triggered by receiving another PDCCH order based at least in part on a wireless communication standard.
[0283] Aspect 50: The method of any of Aspects 28-49, further comprising: transmitting radio resource control signaling indicating whether the second transmission of the PRACH communication is triggered by receiving another PDCCH order.
[0284] Aspect 51: The method of any of Aspects 28-50, wherein whether the second transmission of the PRACH communication is initiated by transmitting another PDCCH order is based at least in part on whether the 1-bit indicator indicates that the PDCCH ordered PRACH communication follows a joint or uplink TCI state indicated by a beam indication DCI.
[0285] Aspect 52: The method of Aspect 51, wherein the second transmission of the PRACH communication is initiated by a UE based at least in part on the 1-bit indicator indicating that the PDCCH ordered PRACH communication does not follow the joint or uplink TCI state indicated by the beam indication DCI.
[0286] Aspect 53: The method of Aspect 51, wherein the second transmission of the PRACH communication is triggered based at least in part on transmitting the other PDCCH order based at least in part on the 1-bit indicator indicating that the PDCCH ordered PRACH communication follows the joint or uplink TCI state indicated by the beam indication DCI.
[0287] Aspect 54: An apparatus for wireless communication at a device, the apparatus comprising one or more processors; one or more memories coupled with the one or more processors; and instructions stored in the one or more memories and executable by the one or more processors to cause the apparatus to perform the method of one or more of Aspects 1-53.
[0288] Aspect 55: An apparatus for wireless communication at a device, the apparatus comprising one or more memories and one or more processors coupled to the one or more memories, the one or more processors configured to cause the device to perform the method of one or more of Aspects 1-53.
[0289] Aspect 56: An apparatus for wireless communication, the apparatus comprising at least one means for performing the method of one or more of Aspects 1-53.
[0290] Aspect 57: A non-transitory computer-readable medium storing code for wireless communication, the code comprising instructions executable by one or more processors to perform the method of one or more of Aspects 1-53.
[0291] Aspect 58: A non-transitory computer-readable medium storing a set of instructions for wireless communication, the set of instructions comprising one or more instructions that, when executed by one or more processors of a device, cause the device to perform the method of one or more of Aspects 1-53.
[0292] Aspect 59: A device for wireless communication, the device comprising a processing system that includes one or more processors and one or more memories coupled with the one or more processors, the processing system configured to cause the device to perform the method of one or more of Aspects 1-53.
[0293] Aspect 60: An apparatus for wireless communication at a device, the apparatus comprising one or more memories and one or more processors coupled to the one or more memories, the one or more processors individually or collectively configured to cause the device to perform the method of one or more of Aspects 1-53.
[0294] Aspect 61: A device comprising a processing system that includes one or more processors and one or more code-storing memories coupled with the one or more processors, the processing system configured to cause the device to perform the method of one or more of Aspects 1-53.
[0295] Aspect 62: A device comprising a processing system that includes processor circuitry and code-storing memory circuitry, the processing system configured to cause the device to perform the method of one or more of Aspects 1-53.
[0296] It will be apparent that systems or methods described herein may be implemented in different forms of hardware or a combination of hardware and software. A component being configured to perform a function means that the component has a capability to perform the function, and does not require the function to be actually performed by the component, unless noted otherwise.
[0297] As used herein, the term “determine” or “determining” can encompass one or more of a wide variety of actions. For example, “determining” can include one or more of calculating, computing, processing, deriving, detecting, estimating, investigating, looking up, inferring, ascertaining, measuring, resolving, selecting, choosing, obtaining, identifying, interpreting, demodulating, decoding, reading, establishing, forming or generating, among other examples. In some such examples, determining can involve a processor performing some type of calculating, computing, deriving, estimating, inferring, ascertaining, resolving, predicting or other processing to obtain one or more numerical values, sets, elements or other information or results. In some other such examples, determining can involve a processor identifying, looking up, investigating or otherwise obtaining some type of value, set, element or other information or result from a table, a data structure, a database or other memory device or location. In some other such examples, determining can involve a processor identifying, interpreting, demodulating, decoding, detecting, reading or otherwise obtaining some type of value, set, element or other information or result signaled in, for example, a received wireless packet. In some other such examples, determining can involve a processor selecting or choosing one or more values, sets, elements or other information or results from a larger set of values, sets elements or other information or results. In some other such examples, determining can involve a processor performing a measurement, such as on a received signal.
[0298] As used herein, the articles “a” and “an” are intended to refer to one or more items and may be used interchangeably with “one or more” or “at least one. ” As used herein, a phrase referring to “at least one of” or “one or more of” a list of items refers to any combination of those items, including single members. As an example, “at least one of: a, b, or c” is intended to cover: a, b, c, a-b, a-c, b-c, and a-b-c. Additionally, as used herein, a phrase referring to “a” or “an” element refers to one or more of such elements acting individually or collectively to perform the recited function (s) . Additionally, as used herein, a “set” can refer to one or more items, and a “subset” can refer to a whole set or less than the whole set, but not an empty set. “Set, ” “group, ” and similar terms are intended to include one or more items and may be used interchangeably with “one or more. ” Furthermore, as used herein, the term “or” is intended to be interpreted in the inclusive sense (such as when referring to a series) and may be used interchangeably with “and / or, ” unless otherwise explicitly indicated (for example, if used in conjunction with “either” or “only one of” ) . For example, “A or B” may include A only, B only, or a combination of A and B. Also, as used herein, the terms “has, ” “have, ” “having, ” “comprise, ” “comprising, ” “include” and “including, ” and derivatives thereof or similar terms are intended to be open-ended terms that do not limit an element that they modify (for example, an element “having” A also may have B) .
[0299] As used herein, the phrase “associated with” is intended to be interpreted in the inclusive sense, unless otherwise explicitly indicated. For example, the phrase “associated with” is not to be construed as a reference to a closed set of conditions, factors, criteria, elements, components, or actions, among other examples. Specifically, unless a phrase refers to “associated with only ‘a, ’ ” or the equivalent in context, whatever it is that is “associated with ‘a, ’ ” may be associated with “a” alone or associated with a combination of “a” and one or more other conditions, factors, criteria, elements, components, or actions, among other examples. In various examples, the phrase “associated with” may be interpreted to mean “in association with, ” “in accordance with, ” “based on, ” “based at least in part on, ” “as a function of, ” “in response to, ” “responsive to, ” or “using” as appropriate in the relevant context unless otherwise explicitly indicated. Furthermore, what follows the phrase “associated with, ” “in association with, ” “in accordance with, ” “based on, ” “based at least in part on, ” “as a function of, ” “in response to, ” “responsive to, ” or “using” is not necessarily the focal point or primary factor associated with the limitation preceding the phrase.
[0300] As used herein, “satisfying a threshold” may, depending on the context, refer to a value being greater than the threshold, greater than or equal to the threshold, less than the threshold, less than or equal to the threshold, equal to the threshold, or not equal to the threshold, among other examples.
[0301] Even though particular combinations of features are recited in the claims or disclosed in the specification, these combinations are not intended to limit the scope of all aspects described herein. Many of these features may be combined in ways not specifically recited in the claims or disclosed in the specification. The disclosure of various aspects includes each dependent claim in combination with every other claim in the claim set.
Claims
1.A user equipment (UE) , comprising:a processing system that includes one or more processors and one or more code-storing memories coupled with the one or more processors, the processing system configured to cause the UE to:receive a physical downlink control channel (PDCCH) order associated with a physical random access channel (PRACH) communication, wherein the PDCCH order includes downlink control information (DCI) with a 1-bit indicator, wherein the DCI indicates a synchronization signal block (SSB) and a preamble index;perform a first transmission of the PRACH communication based at least in part on the SSB, the preamble index, and the 1-bit indicator; andperform a second transmission of the PRACH communication based at least in part on the SSB, the preamble index, and the 1-bit indicator, and based at least in part on determining that the PRACH communication was not successfully received.2.The UE of claim 1, wherein the second transmission of the PRACH communication is performed without receiving a PDCCH order associated with the second transmission of the PRACH communication.3.The UE of claim 1, wherein the 1-bit indicator indicates whether a PRACH transmission power calculation includes a path loss offset associated with a first joint or uplink transmission configuration indicator (TCI) state indicated in a beam indication DCI.4.The UE of claim 3, wherein a PRACH preamble power ramping counter is incremented by one for the second transmission of the PRACH communication based at least in part on the 1-bit indicator indicating that the path loss offset is not included in the PRACH transmission power calculation or based at least in part on the first transmission of the PRACH communication not being based on the first joint or uplink TCI state.5.The UE of claim 3, wherein the 1-bit indicator indicates that the path loss offset is included in the PRACH transmission power calculation, and wherein a PRACH preamble power ramping counter is not incremented based at least in part on the first joint or uplink TCI state being changed to a second joint or uplink TCI state, wherein the PRACH preamble power ramping counter is incremented by one when the first joint or uplink TCI state is not changed.6.The UE of claim 1, wherein the processing system is configured to cause the UE to:receive a beam indication DCI that indicates a first joint or uplink transmission configuration indicator (TCI) state and a second joint or uplink TCI state, wherein the 1-bit indicator is set to a first value to indicate that a first path loss offset associated with the first joint or uplink transmission TCI state is included in a PRACH transmission power calculation or that the first transmission of the PRACH communication is based at least in part on the first joint or uplink TCI state, and wherein the 1-bit indicator is set to a second value to indicate that a second path loss offset associated with the second joint or uplink transmission TCI state is included in the PRACH transmission power calculation or that the first transmission of the PRACH communication is based at least in part on the second joint or uplink TCI state.7.The UE of claim 6, wherein the 1-bit indicator is set to the first value, and wherein a PRACH preamble power ramping counter is incremented by one for the second transmission of the PRACH communication based at least in part on whether the first joint or uplink TCI state is changed to a third joint or uplink TCI state.8.The UE of claim 6, wherein the 1-bit indicator is set to the second value, and wherein a PRACH preamble power ramping counter is incremented by one for the second transmission of the PRACH communication based at least in part on whether the second joint or uplink TCI state is changed to a third joint or uplink TCI state.9.The UE of claim 1, wherein the processing system is configured to cause the UE to:receive a beam indication DCI indicates at least one joint or uplink transmission configuration indicator (TCI) state, wherein the at least one joint or uplink TCI state is configured to remain unchanged during a time period associated with the second transmission of the PRACH communication, and wherein a PRACH preamble power ramping counter is incremented by one for the second transmission of the PRACH communication based at least in part on the at least one joint or uplink TCI state being configured to remain unchanged during the time period.10.The UE of claim 1, wherein the processing system is configured to cause the UE to:receive another PDCCH order, wherein the second transmission of the PRACH communication is performed based at least in part on the other PDCCH order.11.The UE of claim 10, wherein the other PDCCH order indicates whether the second transmission of the PRACH communication comprises a retransmission of the PRACH communication or an initial transmission of the PRACH communication.12.The UE of claim 11, wherein the other PDCCH order includes DCI with another 1-bit indicator, and wherein the second transmission of the PRACH communication comprises the retransmission of the PRACH communication or the initial transmission of the PRACH communication based at least in part on whether a value of the 1-bit indicator and a value of the other 1-bit indicator are a same value.13.The UE of claim 12, wherein the second transmission of the PRACH communication comprises the retransmission of the PRACH communication based at least in part on the value of the 1-bit indicator and the value of the other 1-bit indicator being the same value, and wherein the second transmission of the PRACH communication comprises the initial transmission of the PRACH communication based at least in part on the value of the 1-bit indicator and the value of the other 1-bit indicator being different values.14.The UE of claim 11, wherein the PDCCH order comprises a 1-bit retransmission indicator, and wherein the second transmission of the PRACH communication comprises the retransmission of the PRACH communication or the initial transmission of the PRACH communication based at least in part on whether the 1-bit retransmission indicator indicates a first value or a second value.15.The UE of claim 11, wherein the other PDCCH indicates the second transmission of the PRACH communication comprises the retransmission of the PRACH communication and the other PDCCH indicates the SSB and the preamble index indicated by the PDCCH order, wherein the other PDCCH order includes DCI with another 1-bit indicator, wherein a PRACH preamble power ramping counter is incremented by one based at least in part on the other 1-bit indicator being set to a first value, and wherein the second transmission of the PRACH communication is performed based at least in part on incrementing the PRACH preamble power ramping counter.16.The UE of claim 11, wherein the other PDCCH indicates the second transmission of the PRACH communication comprises the retransmission of the PRACH communication and the other PDCCH order indicates the SSB and the preamble index indicated by the PDCCH order, wherein the other PDCCH order includes DCI with another 1-bit indicator, wherein the other 1-bit indicator is set to a second value, and wherein a PRACH preamble power ramping counter associated with performing the second transmission of the PRACH communication is incremented based at least in part on whether a joint or uplink TCI state indicated in a beam indication DCI is changed or not during the first transmission of the PRACH and the second transmission of the PRACH.17.The UE of claim 16, wherein the PRACH preamble power ramping counter is incremented based at least in part on the joint or uplink TCI state indicated in the beam indication DCI being not changed.18.The UE of claim 16, wherein the UE refrains from incrementing the PRACH preamble power ramping counter based at least in part on the joint or uplink TCI state indicated in the beam indication DCI being changed to another joint or uplink TCI state.19.A method of wireless communication performed by a user equipment (UE) , comprising:receiving a physical downlink control channel (PDCCH) order associated with a physical random access channel (PRACH) communication, wherein the PDCCH order includes downlink control information (DCI) with a 1-bit indicator, wherein the DCI indicates a synchronization signal block (SSB) and a preamble index;performing a first transmission of the PRACH communication based at least in part on the SSB, the preamble index, and the 1-bit indicator; andperforming a second transmission of the PRACH communication based at least in part on the SSB, the preamble index, and the 1-bit indicator, and based at least in part on determining that the PRACH communication was not successfully received.20.A non-transitory computer-readable medium storing a set of instructions for wireless communication, the set of instructions comprising:one or more instructions that, when executed by one or more processors of a user equipment (UE) , cause the UE to:receive a physical downlink control channel (PDCCH) order associated with a physical random access channel (PRACH) communication, wherein the PDCCH order includes downlink control information (DCI) with a 1-bit indicator, wherein the DCI indicates a synchronization signal block (SSB) and a preamble index;perform a first transmission of the PRACH communication based at least in part on the SSB, the preamble index, and the 1-bit indicator; andperform a second transmission of the PRACH communication based at least in part on the SSB, the preamble index, and the 1-bit indicator, and based at least in part on determining that the PRACH communication was not successfully received.