Power control for initial access
By configuring UE with multiple power control parameter sets and applying path loss offsets based on transmission direction, the challenges of signal degradation and interference in uplink dense deployments are addressed, improving throughput and resource efficiency.
Patent Information
- Authority / Receiving Office
- WO · WO
- Patent Type
- Applications
- Current Assignee / Owner
- QUALCOMM INC
- Filing Date
- 2025-01-08
- Publication Date
- 2026-07-16
Smart Images

Figure CN2025071180_16072026_PF_FP_ABST
Abstract
Description
POWER CONTROL FOR INITIAL ACCESSFIELD 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 control for initial access.BACKGROUND
[0002] Wireless communication systems are widely deployed to provide various services, which may involve carrying or supporting voice, text, other messaging, video, data, and / 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, and / 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.
[0003] An example telecommunication standard is New Radio (NR) . NR, which may also be referred to as 5G, is part of a continuous mobile broadband evolution promulgated by the Third Generation Partnership Project (3GPP) . NR (and other RATs beyond NR) may be designed to better support enhanced mobile broadband (eMBB) access, Internet of things (IoT) networks or reduced capability device deployments, and ultra-reliable low latency communication (URLLC) applications. To support these verticals, NR systems 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) , licensed and unlicensed spectrum access, non-terrestrial network (NTN) deployments, sidelink and other device-to-device direct communication technologies (for example, cellular vehicle-to-everything (CV2X) communication) , multiple-subscriber implementations, high-precision positioning, and / or radio frequency (RF) sensing, among other examples. 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.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 random access channel (RACH) configuration that configures a plurality of sets of power control parameters, where each set of power control parameters includes one or more of a target receive power value, a power ramp up step value, or a maximum quantity of preamble transmissions. The method may include selecting a set of power control parameters from the plurality of sets of power control parameters based at least in part on a rule. The method may include transmitting a RACH message using the selected set of power control parameters.
[0005] Some aspects described herein relate to a method of wireless communication performed by a UE. The method may include receiving an indication of a path loss offset for initial access power control. The method may include transmitting a RACH message using the path loss offset based at least in part on whether the RACH message is to be transmitted to a downlink transmit receive point (TRP) , an uplink-only TRP, or either a downlink TRP or an uplink-only TRP.
[0006] Some aspects described herein relate to an apparatus for wireless communication at a UE. The apparatus may include one or more memories and one or more processors coupled to the one or more memories. The one or more processors may be individually or collectively configured to receive a RACH configuration that configures a plurality of sets of power control parameters, where each set of power control parameters includes one or more of a target receive power value, a power ramp up step value, or a maximum quantity of preamble transmissions. The one or more processors may be individually or collectively configured to select a set of power control parameters from the plurality of sets of power control parameters based at least in part on a rule. The one or more processors may be individually or collectively configured to transmit a RACH message using the selected set of power control parameters.
[0007] Some aspects described herein relate to an apparatus for wireless communication at a UE. The apparatus may include one or more memories and one or more processors coupled to the one or more memories. The one or more processors may be configured to receive an indication of a path loss offset for initial access power control. The one or more processors may be configured to transmit a RACH message using the path loss offset based at least in part on whether the RACH message is to be transmitted to a downlink TRP, an uplink-only TRP, or either a downlink TRP or an uplink-only TRP.
[0008] 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 RACH configuration that configures a plurality of sets of power control parameters, where each set of power control parameters includes one or more of a target receive power value, a power ramp up step value, or a maximum quantity of preamble transmissions. The set of instructions, when executed by one or more processors of the UE, may cause the UE to select a set of power control parameters from the plurality of sets of power control parameters based at least in part on a rule. The set of instructions, when executed by one or more processors of the UE, may cause the UE to transmit a RACH message using the selected set of power control parameters.
[0009] 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 an indication of a path loss offset for initial access power control. The set of instructions, when executed by one or more processors of the UE, may cause the UE to transmit a RACH message using the path loss offset based at least in part on whether the RACH message is to be transmitted to a downlink TRP, an uplink-only TRP, or either a downlink TRP or an uplink-only TRP.
[0010] Some aspects described herein relate to an apparatus for wireless communication. The apparatus may include means for receiving a RACH configuration that configures a plurality of sets of power control parameters, where each set of power control parameters includes one or more of a target receive power value, a power ramp up step value, or a maximum quantity of preamble transmissions. The apparatus may include means for selecting a set of power control parameters from the plurality of sets of power control parameters based at least in part on a rule. The apparatus may include means for transmitting a RACH message using the selected set of power control parameters.
[0011] Some aspects described herein relate to an apparatus for wireless communication. The apparatus may include means for receiving an indication of a path loss offset for initial access power control. The apparatus may include means for transmitting a RACH message using the path loss offset based at least in part on whether the RACH message is to be transmitted to a downlink TRP, an uplink-only TRP, or either a downlink TRP or an uplink-only TRP.
[0012] 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, base station, network node, network entity, wireless communication device, and / or processing system as substantially described with reference to, and as illustrated by, this specification and accompanying drawings.
[0013] The foregoing paragraphs of this section have broadly summarized some aspects of the present disclosure. These and additional aspects and associated advantages will be described hereinafter. The disclosed aspects may be used as a basis for modifying or designing other aspects for carrying out the same or similar purposes of the present disclosure. Such equivalent aspects do not depart from the scope of the appended claims. Characteristics of the aspects disclosed herein, both their organization and method of operation, together with associated advantages, will be better understood from the following description when considered in connection with the accompanying drawings.BRIEF DESCRIPTION OF THE DRAWINGS
[0014] The appended drawings illustrate some aspects of the present disclosure but are not limiting of the scope of the present disclosure because the description may enable other aspects. Each of the drawings is provided for purposes of illustration and description, and not as a definition of the limits of the claims. The same or similar reference numbers in different drawings may identify the same or similar elements.
[0015] Fig. 1 is a diagram illustrating an example of a wireless communication network, in accordance with the present disclosure.
[0016] Fig. 2 is a diagram illustrating an example disaggregated network node architecture, in accordance with the present disclosure.
[0017] Fig. 3 is a diagram illustrating an example of an uplink dense deployment, in accordance with the present disclosure.
[0018] Fig. 4 is a diagram illustrating an example associated with configuring power control parameters, in accordance with the present disclosure.
[0019] Fig. 5 is a diagram illustrating an example associated with configuring power control parameters, in accordance with the present disclosure.
[0020] Fig. 6 is a diagram illustrating an example process performed, for example, at a user equipment (UE) or an apparatus of a UE, in accordance with the present disclosure.
[0021] Fig. 7 is a diagram illustrating an example process performed, for example, at a UE or an apparatus of a UE, in accordance with the present disclosure.
[0022] Fig. 8 is a diagram of an example apparatus for wireless communication, in accordance with the present disclosure.DETAILED DESCRIPTION
[0023] Various aspects of the present disclosure are described hereinafter with reference to the accompanying drawings. However, aspects of the present disclosure may be embodied in many different forms. The present disclosure is not to be construed as limited to any specific aspect illustrated by or described with reference to an accompanying drawing or otherwise presented in this disclosure. Rather, these aspects are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art. One skilled in the art may appreciate that the scope of the disclosure is intended to cover any aspect of the disclosure disclosed herein, whether implemented independently of or in combination with any other aspect of the disclosure. For example, an apparatus may be implemented or a method may be practiced using various combinations or quantities of the aspects set forth herein. In addition, the scope of the disclosure is intended to cover an apparatus having, or a method that is practiced using, other structures and / or functionalities in addition to or other than the structures and / or functionalities with which various aspects of the disclosure set forth herein may be practiced. Any aspect of the disclosure disclosed herein may be embodied by one or more elements of a claim.
[0024] Several aspects of telecommunication systems will now be presented with reference to various methods, operations, apparatuses, and techniques. These methods, operations, apparatuses, and techniques will be described in the following detailed description and illustrated in the accompanying drawings by various blocks, modules, components, circuits, steps, processes, or algorithms (collectively referred to as “elements” ) . These elements may be implemented using hardware, software, or a combination of hardware and software. Whether such elements are implemented as hardware or software depends upon the particular application and design constraints imposed on the overall system.
[0025] A user equipment (UE) may perform a random access channel (RACH) procedure to connect to a network. The RACH procedure may include the transmission of random access messages, such as a physical RACH (PRACH) message (e.g., PRACH preamble) or a Msg3 or MsgA (depending on the RACH procedure) . The UE may use power control for transmission of the messages. There are several issues associated with power control for PRACH messages, especially in an uplink (UL) dense deployment, where UL transmit receive points (TRPs) may be densely deployed to assist with UL messages reaching a network entity. The UL dense deployment may include multiple UL receive (Rx) points, which are UL-only nodes where only UL signals and channels are received for reception by a network entity (e.g., gNB) . A UE may transmit a message to a UL-only node. In some aspects, the UL Rx points may be UL TRPs with limited DL transmissions. For example, the UL TRP may transmit a DL reference signal (e.g., a synchronization signal block (SSB) ) . Downlink (DL) signals and channels are transmitted from a different node (e.g., macro node, central node, serving cell, serving base station) . The UL Rx points are connected to the gNB via a backhaul.
[0026] The UL dense deployment reduces the UL path loss (PL) (loss of signal strength due to the environment) , which is helpful when UL coverage is the bottleneck. The UL dense deployment can also help with deployment costs and complexity because the UL Rx points do not transmit any DL signals or may reduce the DL transmission. The UL Rx points are expected to receive a UL signal and transmit the UL signal to the macro node, with or without some processing.
[0027] For coverage enhancement, it is beneficial to allow initial access to a UL TRP. A RACH configuration may be transmitted in a system information block one (SIB1) to configure a UE for the initial access. In some aspects, the RACH configuration may indicate power control parameters, such as a preamble received target power (P0) , a maximum quantity of preamble transmissions, or a power ramping step.
[0028] For asymmetric DL single TRP (sTRP) / UL multiple TRP (mTRP) deployment scenarios, a path loss offset may be a fixed value that is added to a path loss calculation to adjust for environmental, antenna, or deployment factors that affect signal strength. However, a path loss offset cannot be used for initial access RACH. Rather, a path loss offset is supported for physical downlink control channel (PDCCH) -ordered physical RACH (PRACH) , which is after a radio resource control (RRC) connection. Furthermore, initial access RACH may be associated with interference or radio frequency (RF) saturation, which may affect the transmission power. A transmission power that is too low may cause signal degradation that wastes signaling resources and reduces throughput. A transmission power that is too high may waste power and cause interference for other UEs.
[0029] Various aspects relate generally to initial access. Some aspects more specifically relate to a network entity that configures a UE with multiple sets of power control parameters for a RACH message (e.g., PRACH message or a MsgA preamble) , where each set of power control parameters may include a target receive power value, a power ramp up step value, and / or a maximum quantity of preamble transmissions. The UE may select a set of power control parameters from the multiple sets of power control parameters based at least in part on a rule, such as whether a RACH message is to be transmitted towards a DL TRP (e.g., allows both UL and DL) , towards a UL TRP (e.g., UL-only TRP) , or towards either a DL TRP or a UL TRP (both the DL TRP and the UL TRP will listen) . For example, there may be one set of power control parameters for a transmission to a DL TRP and another set of power control parameters for a transmission to a UL-only TRP. Alternatively, there may be one set of power control parameters for a transmission to a DL TRP and another set of power control parameters for a transmission to a UL TRP with limited DL. The UE may transmit the PRACH message using the selected set of power control parameters.
[0030] Particular aspects of the subject matter described in this disclosure can be implemented to realize one or more of the following potential advantages. By being configured with multiple sets of power control parameters and by selecting a set of power control parameters based on a rule, the UE may use an appropriate transmit power to conserve power or to use an appropriate power to avoid signal degradation, which conserves signaling resources, reduces interference, and increases throughput.
[0031] In some aspects, a network entity may configure the UE with a path loss offset for PRACH or MsgA preamble power control via a SIB1 or an RRC message (for an RRC-connected UE) . The network entity may transmit an indication of a path loss offset. Whether or not a path loss offset is applied (or which PL offset is applied) is based at least in part on whether a RACH message is to be transmitted towards a DL TRP, towards a UL-only TRP, or towards either a DL TRP or a UL-only TRP (both DL TRPs and UL TRPs will listen) . In some aspects, the path loss offset may be applied on top of the path loss in the power control formula. The UE may determine the transmission power for the RACH message. The UE may use a power control formula and determine whether to include a path loss offset in the power control formula. The UE may transmit a RACH message with a transmission power that is based at least in part on the power control formula.
[0032] By configuring the UE with a path loss offset for UL-only TRPs, the UE may use a more appropriate transmission power for a UL-TRP deployment. As a result, throughput is increased and signaling resources are conserved (not wasted by degradation) .
[0033] As described above, wireless communication systems may be deployed to provide various services, which may involve carrying or supporting voice, text, other messaging, video, data, and / or other traffic. Some wireless communications systems may employ multiple-access radio access technologies (RATs) . The multiple-access RATs may be capable of supporting communication with multiple wireless communication devices by sharing the available system resources (for example, time domain resources, frequency domain resources, spatial domain resources, and / or device transmit power, among other examples) . Examples of such multiple-access RATs include code division multiple access (CDMA) systems, time division multiple access (TDMA) systems, frequency division multiple access (FDMA) systems, orthogonal frequency division multiple access (OFDMA) systems, single-carrier frequency division multiple access (SC-FDMA) systems, and time division synchronous code division multiple access (TD-SCDMA) systems.
[0034] Multiple-access RATs are supported by technological advancements that have been adopted in various telecommunication standards, which define common protocols that enable wireless communication devices to communicate on a local, municipal, enterprise, national, regional, or global level. For example, 5G New Radio (NR) is part of a continuous mobile broadband evolution promulgated by the Third Generation Partnership Project (3GPP) . 5G 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, and / or massive machine-type communication (mMTC) , among other examples.
[0035] 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, and / or artificial intelligence or machine learning (AI / ML) , among other examples.
[0036] 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 and / or aerial platforms, among other examples.
[0037] 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. The methods, operations, apparatuses, and techniques described herein may enable one or more of the foregoing technologies or new technologies and / or support one or more of the foregoing use cases or new use cases.
[0038] Fig. 1 is a diagram illustrating an example of a wireless communication network 100, in accordance with the present disclosure. The wireless communication network 100 may be or may include elements of a 5G (or NR) 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 a network node (NN) 110a and a network node 110b. 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. In some examples, a UE 120 may also communicate with other UEs 120 and a network node 110 may communicate with a core network and with other network nodes 110.
[0039] The network nodes 110 and the UEs 120 of the wireless communication network 100 may communicate using the electromagnetic spectrum, which may be subdivided by frequency or wavelength into various classes, bands, carriers, and / or channels. For example, devices of the wireless communication network 100 may communicate using one or more operating bands. In some aspects, multiple wireless communication networks 100 may be deployed in a given geographic area. Each wireless communication network 100 may support a particular RAT (which may also be referred to as an air interface) and may operate on one or more carrier frequencies in one or more frequency bands or ranges. In some examples, when multiple RATs are deployed in a given geographic area, each RAT in the geographic area may operate on different frequencies to avoid interference with other RATs. Additionally or alternatively, in some examples, the wireless communication network 100 may implement dynamic spectrum sharing (DSS) , in which multiple RATs are implemented with dynamic bandwidth allocation (for example, based on user demand) in a single frequency band. In some examples, the wireless communication network 100 may support communication over unlicensed spectrum, where access to an unlicensed channel is subject to a channel access mechanism. For example, in a shared or unlicensed frequency band, a transmitting device may perform a channel access procedure, such as a listen-before-talk (LBT) procedure, to contend against other devices for channel access before transmitting on a shared or unlicensed channel.
[0040] Various operating bands have been 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, despite being different than the extremely high frequency (EHF) band (30 GHz through 300 GHz) , which is identified by the International Telecommunications Union (ITU) as a “millimeter wave” band. The frequencies between FR1 and FR2 are often referred to as mid-band frequencies, which include FR3. Frequency bands falling within FR3 may inherit FR1 characteristics or FR2 characteristics, and thus may effectively extend features of FR1 or FR2 into the mid-band frequencies. Thus, “sub-6 GHz, ” if used herein, may broadly refer to frequencies that are less than 6 GHz, that are within FR1, and / or that are included in mid-band frequencies. Similarly, the term “millimeter wave, ” if used herein, may broadly refer to mid-band frequencies or to frequencies that are within FR2, FR4, FR4-a or FR4-1, FR5, and / or the EHF band. Higher frequency bands may extend 5G NR operation, 6G operation, and / or other RATs beyond 52.6 GHz.
[0041] A network node 110 and / 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, such as a processing system 140 with communication manager 150 of the UE 120 or a processing system 145 with communication manager 155 of the network node 110. A processing system (for example, the processing system 140 and / 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) ) , and / 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.
[0042] 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 (RAM) or read-only memory (ROM) , 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 and may individually or collectively store processor-executable code or instructions (such as software) that, when executed by one or more of the processors, may configure one or more of the processors 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.
[0043] 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 and / or the processing system 145 include or implement one or more of the modems. The processing system 140 and the processing system 145 may also 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 and / or the processing system 145 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) , and / 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 of the UE 120 or by the processing system 145 of the network node 110) .
[0044] 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.
[0045] A network node 110 may be, may include, or may also 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 TRP, a network entity, a network element, a network equipment, and / 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 consist of 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.
[0046] Alternatively, and as also shown, a network node 110 may be a disaggregated network node (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 and / or logically distributed among two or more nodes in the same geographic location or in different geographic locations. An example disaggregated network node architecture is described in more detail below with reference to Fig. 2. 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.
[0047] The 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 an RRC layer, a packet data convergence protocol (PDCP) layer, and a service data adaptation protocol (SDAP) layer, among other examples. A DU may host one or more of a radio link control (RLC) layer, a medium access control (MAC) layer, and / 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, and / or 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. In some examples, a single network node 110 may include a combination of one or more CUs, one or more DUs, and / or one or more RUs. In some examples, a CU, a DU, and / 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.
[0048] Some network nodes 110 (for example, a base station, an RU, or a TRP) may provide communication coverage for a particular geographic area. The term “cell” can refer to a coverage area of a network node 110 or to a network node 110 itself, depending on the context in which the term is used. A network node 110 may support one or more cells (for example, each cell may support communication within an angular (for example, 60 degree) range around the network node) . In some examples, a network node 110 may provide communication coverage for a macro cell, a pico cell, a femto cell, or another type of cell. A macro cell may cover a relatively large geographic area (for example, several kilometers in radius) and may allow unrestricted access by UEs 120 with associated service subscriptions. A pico cell may cover a relatively small geographic area and may also allow unrestricted access by UEs 120 with associated service subscriptions. A femto cell may cover a relatively small geographic area (for example, a home) and may allow restricted access by UEs 120 having association with the femto cell (for example, UEs 120 in a closed subscriber group (CSG) ) . In some examples, a cell may not necessarily be stationary. For example, the geographic area of the cell may move according to the location of an associated mobile network node 110 (for example, a train, a satellite, an unmanned aerial vehicle, or an NTN network node) .
[0049] The wireless communication network 100 may be a heterogeneous network that includes network nodes 110 of different types, such as macro network nodes, pico network nodes, femto network nodes, relay network nodes, aggregated network nodes, and / or disaggregated network nodes, among other examples. Various different types of network nodes 110 may generally transmit at different power levels, serve different coverage areas (for example, a cell 130a and a cell 130b) , and / or have different impacts on interference in the wireless communication network 100 than other types of network nodes 110.
[0050] 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 may also be referred to as an access terminal, a mobile station, 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) , a UE function of a network node, and / or any other suitable device or function that may communicate via a wireless medium.
[0051] Some UEs 120 may be classified according to different categories in association with different complexities and / or different capabilities. UEs 120 in a first category may facilitate massive IoT in the wireless communication network 100, and may offer low complexity and / or cost relative to UEs 120 in a second category. UEs 120 in a second category may include mission-critical IoT devices, legacy UEs, baseline UEs, high-tier UEs, advanced UEs, full-capability UEs, and / or premium UEs that are capable of URLLC, eMBB, and / or precise positioning in the wireless communication network 100, among other examples. A third category of UEs 120 may have mid-tier complexity and / or capability (for example, a capability between that of the UEs 120 of the first category and that of the UEs 120 of the second capability) . 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, and / or an NR-Lite UE, among other examples. RedCap UEs may bridge a gap between the capability and complexity of NB-IoT devices and / or eMTC UEs, and mission-critical IoT devices and / or premium UEs. RedCap UEs may include, for example, wearable devices, IoT devices, industrial sensors, or cameras that are associated with a limited bandwidth, power capacity, and / or transmission range, among other examples. RedCap UEs may support healthcare environments, building automation, electrical distribution, process automation, transport and logistics, or smart city deployments, among other examples.
[0052] 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) .
[0053] 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) and / or reconfigured (for example, in real-time or near-real-time) according to changing network conditions in the wireless communication network 100 and / 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. The use of BWPs enables more efficient use of the available frequency domain resources in the wireless communication network 100 because fewer frequency domain resources may be allocated to a BWP for a UE 120 (which may reduce the quantity of frequency domain resources that a UE 120 is required to monitor and reduce UE power consumption by enabling the UE to monitor fewer frequency domain resources) , leaving more frequency domain resources to be spread across multiple UEs 120. Thus, BWPs may also assist in the implementation of lower-capability (for example, RedCap) UEs 120 by facilitating the configuration of smaller bandwidths for communication by such UEs 120 and / or by facilitating reduced UE power consumption.
[0054] 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 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 and / 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.
[0055] As used herein, an uplink signal may include a reference signal, control information, or data. For example, uplink reference signals include 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 and / 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) , and / 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) , and / 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.
[0056] 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. The network node 110 may transmit, to the UE 120, an indication of the selected MCS for the downlink signal, such as via DCI that schedules the downlink signal. As another example, the network node 110 may transmit, and the UE 120 may receive, an indication of an MCS to be applied for the one or more uplink signals, such as via DCI scheduling transmission of the one or more uplink signals.
[0057] The network node 110 or the UE 120 (such as by using the processing system 145 or the processing system 140, respectively, and / 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, and / 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, and / 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 and / 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 110 or the UE 120 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 110 may provide precoding information indicating which precoder, defined by the codebook, is to be used by the UE 120. 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 110 or the UE 120 may transmit the processed downlink or uplink signals, respectively, via one or more antennas.
[0058] The network node 110 or the UE 120 may receive uplink signals or downlink signals, respectively, via one or more antennas. The network node 110 or the UE 120 (for example, using the processing system 145 or the processing system 140, respectively, and / 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, and / 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 110 or the UE 120 (for example, using the processing system 145 or the processing system 140, respectively, and / or a coupled decoder or one or more modems) may decode the received information (such as by using an ECC, a decoding operation, and / or an FEC operation) to detect errors and / 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.
[0059] In some examples, a UE 120 and a network node 110 may perform MIMO communication. “MIMO” generally refers to transmitting or receiving multiple signals (such as multiple layers or multiple data streams) simultaneously over the same time and frequency resources. MIMO techniques generally exploit multipath propagation. A network node 110 and / or UE 120 may communicate using massive MIMO, multi-user MIMO, or single-user MIMO, which may involve rapid switching between beams or cells. For example, the amplitudes and / or phases of signals transmitted via antenna elements and / or sub-elements may be modulated and shifted relative to each other (such as by manipulating a phase shift, a phase offset, and / or an amplitude) to generate one or more beams, which is referred to as beamforming. For example, the network node 110b may generate one or more beams 160a, and the UE 120b 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 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, and / or a vertical direction) , a set of parameters that indicate one or more aspects of a directional signal, a direction associated with the signal, and / or a set of directional resources associated with the signal, among other examples.
[0060] MIMO may be implemented using various spatial processing or spatial multiplexing operations. In some examples, MIMO may include a massive MIMO technique which may be associated with an increased (for example, “massive” ) quantity of antennas at the network node 110 and / or at the UE 120, such as in a network implementing mmWave technology. Massive MIMO may improve communication reliability by enabling a network node 110 and / or a UE 120 to communicate the same data across different propagation (or spatial) paths. In some examples, MIMO may support simultaneous transmission to multiple receivers, referred to as multi-user MIMO (MU-MIMO) . Some RATs may employ MIMO techniques, such as multi-TRP (mTRP) operation (including redundant transmission or reception on multiple TRPs) , reciprocity in the time domain or the frequency domain, single-frequency-network (SFN) transmission, or non-coherent joint transmission (NCJT) .
[0061] To support MIMO techniques, the network node 110 and the UE 120 may perform one or more beam management operations, such as an initial beam acquisition operation, one or more beam refinement operations, and / or a beam recovery operation. For example, an initial beam acquisition operation may involve the network node 110 transmitting signals (for example, SSBs, CSI-RSs, or other signals) via respective beams (for example, of the beams 160a 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 160b of the UE 120) to identify a best beam (or beam pair) for communication between the UE 120 and the network node 110. For example, the UE 120 may transmit an indication (for example, in a message associated with a RACH operation) of a (best) identified beam of the network node 110 (for example, by indicating an SSBRI or other identifier associated with the beam) . 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 via one or more spatial parameters, such as a transmission configuration indicator (TCI) state and / or a quasi-co-location (QCL) parameter, among other examples. The network node 110 and the UE 120 may increase reliability and / or achieve efficiencies in throughput, signal strength, and / or other signal properties for massive MIMO operations by performing the beam management operations.
[0062] 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 and / or an artificial neural network (ANN) model. The AI / ML model may be deployed at one or more devices 165 (for example, a network node 110 and / or UEs 120) . For example, the one or more devices 165 may include a UE 120 (for example, the processing system 140) , a network node 110 (for example, the processing system 145) , one or more servers, and / or one or more components of a cloud computing network, among other examples. In some examples, the AI / ML model (or an instance of the AI / ML model) may be deployed at multiple devices (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, 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, the AI / ML model (s) may be trained to identify patterns or relationships in data corresponding to the wireless communication network 100, a device, and / 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.
[0063] In some aspects, a UE (e.g., a UE 120) may include a communication manager 150. As described in more detail elsewhere herein, the communication manager 150 may receive a RACH configuration that configures a plurality of sets of power control parameters, where each set of power control parameters includes one or more of a target receive power value, a power ramp up step value, or a maximum quantity of preamble transmissions; select a set of power control parameters from the plurality of sets of power control parameters based at least in part on a rule; and transmit a RACH message using the selected set of power control parameters. Additionally, or alternatively, the communication manager 150 may perform one or more other operations described herein.
[0064] In some aspects, the communication manager 150 may receive an indication of a path loss offset for initial access power control; and transmit a RACH message using the path loss offset based at least in part on whether the RACH message is to be transmitted to a downlink transmit receive point (TRP) , an uplink-only TRP, or either a downlink TRP or an uplink-only TRP. Additionally, or alternatively, the communication manager 150 may perform one or more other operations described herein.
[0065] Fig. 2 is a diagram illustrating an example disaggregated network node architecture 200, in accordance with the present disclosure. One or more components of the example disaggregated network node architecture 200 may be, may include, or may be included in one or more network nodes (such one or more network nodes 110) . The disaggregated network node architecture 200 may include a CU 210 that can communicate directly with a core network 220 via a backhaul link, or that can communicate indirectly with the core network 220 via one or more disaggregated control units, such as a non-real-time (Non-RT) RAN intelligent controller (RIC) 250 associated with a Service Management and Orchestration (SMO) Framework 260 and / or a near-real-time (Near-RT) RIC 270 (for example, via an E2 link) . The CU 210 may communicate with one or more DUs 230 via respective midhaul links, such as via F1 interfaces. Each of the DUs 230 may communicate with one or more RUs 240 via respective fronthaul links. Each of the RUs 240 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 240.
[0066] Each of the components of the disaggregated network node architecture 200, including the CUs 210, the DUs 230, the RUs 240, the Near-RT RICs 270, the Non-RT RICs 250, and the SMO Framework 260, may include one or more interfaces or may be coupled with one or more interfaces for receiving or transmitting signals, such as data or information, via a wired or wireless transmission medium.
[0067] In some aspects, the CU 210 may be logically split into one or more CU user plane (CU-UP) units and one or more CU control plane (CU-CP) units. A CU-UP unit may communicate bidirectionally with a CU-CP unit via an interface, such as the E1 interface when implemented in an O-RAN configuration. The CU 210 may be deployed to communicate with one or more DUs 230, as necessary, for network control and signaling. Each DU 230 may correspond to a logical unit that includes one or more base station functions to control the operation of one or more RUs 240. For example, a DU 230 may host various layers, such as an RLC layer, a MAC layer, or one or more PHY layers, such as one or more high PHY layers or one or more low PHY layers. Each layer (which also may be referred to as a module) may be implemented with an interface for communicating signals with other layers (and modules) hosted by the DU 230, or for communicating signals with the control functions hosted by the CU 210. Each RU 240 may implement lower layer functionality. In some aspects, real-time and non-real-time aspects of control and user plane communication with the RU (s) 240 may be controlled by the corresponding DU 230.
[0068] The SMO Framework 260 may support RAN deployment and provisioning of non-virtualized and virtualized network elements. For non-virtualized network elements, the SMO Framework 260 may support the deployment of dedicated physical resources for RAN coverage requirements, which may be managed via an operations and maintenance interface, such as an O1 interface. For virtualized network elements, the SMO Framework 260 may interact with a cloud computing platform (such as an open cloud (O-Cloud) platform 290) to perform network element life cycle management (such as to instantiate virtualized network elements) via a cloud computing platform interface, such as an O2 interface. A virtualized network element may include, but is not limited to, a CU 210, a DU 230, an RU 240, a non-RT RIC 250, and / or a Near-RT RIC 270. In some aspects, the SMO Framework 260 may communicate with a hardware aspect of a 4G RAN, a 5G NR RAN, and / or a 6G RAN, such as an open eNB (O-eNB) 280, via an O1 interface. Additionally or alternatively, the SMO Framework 260 may communicate directly with each of one or more RUs 240 via a respective O1 interface. In some deployments, this configuration can enable each DU 230 and the CU 210 to be implemented in a cloud-based RAN architecture, such as a vRAN architecture.
[0069] The Non-RT RIC 250 may include or may implement a logical function that enables non-real-time control and optimization of RAN elements and resources, AI / ML workflows including model training and updates, and / or policy-based guidance of applications and / or features in the Near-RT RIC 270. The Non-RT RIC 250 may be coupled to or may communicate with (such as via an A1 interface) the Near-RT RIC 270. The Near-RT RIC 270 may include or may implement a logical function that enables near-real-time control and optimization of RAN elements and resources via data collection and actions via an interface (such as via an E2 interface) connecting one or more CUs 210, one or more DUs 230, and / or an O-eNB 280 with the Near-RT RIC 270.
[0070] In some aspects, to generate AI / ML models to be deployed in the Near-RT RIC 270, the Non-RT RIC 250 may receive parameters or external enrichment information from external servers. Such information may be utilized by the Near-RT RIC 270 and may be received at the SMO Framework 260 or the Non-RT RIC 250 from non-network data sources or from network functions. In some examples, the Non-RT RIC 250 or the Near-RT RIC 270 may tune RAN behavior or performance. For example, the Non-RT RIC 250 may monitor long-term trends and patterns for performance and may employ AI / ML models to perform corrective actions via the SMO Framework 260 (such as reconfiguration via an O1 interface) or via creation of RAN management policies (such as A1 interface policies) .
[0071] The network node 110, the processing system 145 of the network node 110, the UE 120, the processing system 140 of the UE 120, the CU 210, the DU 230, the RU 240, or any other component (s) of Fig. 1 and / or Fig. 2 may implement one or more techniques or perform one or more operations associated with indicating a PL reference signal for a PRACH message, as described in more detail elsewhere herein. For example, the processing system 145 of the network node 110, the processing system 140 of the UE 120, the CU 210, the DU 230, or the RU 240 may perform or direct operations of, for example, process 600 of Fig. 6, process 700 of Fig. 7, 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, the CU 210, the DU 230, or the RU 240. 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, the UE 120, the CU 210, the DU 230, or the RU 240, may cause the one or more processors to perform process 600 of Fig. 6, process 700 of Fig. 7, or other processes as described herein. In some examples, executing instructions may include running the instructions, converting the instructions, compiling the instructions, and / or interpreting the instructions, among other examples.
[0072] In some aspects, a UE (e.g., a UE 120) includes means for receiving a RACH configuration that configures a plurality of sets of power control parameters, where each set of power control parameters includes one or more of a target receive power value, a power ramp up step value, or a maximum quantity of preamble transmissions; means for selecting a set of power control parameters from the plurality of sets of power control parameters based at least in part on a rule; and / or means for transmitting a RACH message using the selected set of power control parameters.
[0073] In some aspects, the UE includes means for receiving an indication of a path loss offset for initial access power control; and / or means for transmitting a RACH message using the path loss offset based at least in part on whether the RACH message is to be transmitted to a downlink TRP, an uplink-only TRP, or either a downlink TRP or an uplink-only TRP. 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 802 depicted and described in connection with Fig. 8) , and / or a transmission component (for example, transmission component 804 depicted and described in connection with Fig. 8) , among other examples.
[0074] Fig. 3 is a diagram illustrating an example 300 of a UL dense deployment, in accordance with the present disclosure.
[0075] In order to improve the coverage and capacity of UL transmissions, a UL dense deployment may be used. As shown by example 300, the UL dense deployment may include multiple UL receive (Rx) points, which are UL-only nodes where only UL signals and channels are received for reception by a network entity (e.g., gNB) . A UE may transmit a message to a UL-only node. However, without DL transmission from a UL TRP, many features like power control or beam management may become complicated because new mechanisms are needed to support these features. Therefore, in some aspects, the UL Rx points may include UL TRPs with limited DL transmissions for network energy saving. The UL TRP may implement simple DL baseband capability for transmitting a DL reference signal (RS) (e.g., an SSB or a CSI-RS) . The DL RS may be transmitted with a low RF capability. Only a single Tx beam may be supported for a DL RS. The periodicity of a DL RS can be much larger than from a DL TRP. The Tx power of a DL RS from a UL TRP can be much lower than a DL TRP to match the UL coverage of the UL TRP. DL signals and channels are transmitted from a different node (e.g., macro node, central node, serving cell, serving base station) . The UL Rx points are connected to the gNB via a backhaul.
[0076] The UL dense deployment reduces the UL path loss (loss of signal strength due to the environment) , which is helpful when UL coverage is the bottleneck. The UL dense deployment can also help with deployment costs and complexity because the UL Rx points do not transmit any DL signals or may reduce the DL transmissions. The UL Rx points are expected to just receive a UL signal and transmit the UL signal to the macro node, with or without some processing.
[0077] A UE may determine a transmission power for a PRACH message, PPRACH, b, f, c (i) , on an active UL BWP b of carrier f of cell c based on DL RS for cell c in transmission occasion i as: PPRACH, b, f, c (i) = min {PCMAX, f, c (i) , PPRACH, target, f, c + PLb, f, c} decibel milliwatts (dBm) , where PCMAX, f, c (i) is the UE configured maximum output power, PPRACH, target, f, c is the PRACH target reception power PREAMBLE_RECEIVED_TARGET_POWER provided by higher layers, and PLb, f, c is a pathloss for the active UL BWP b of carrier f based on the DL RS associated with the PRACH transmission on the active DL BWP of cell c and calculated by the UE in dB (e.g., as referenceSignalPower –higher layer filtered RSRP in dBm) .
[0078] For coverage enhancement, it is beneficial to allow initial access to a UL TRP. A RACH configuration may be transmitted in a SIB1 to configure a UE for the initial access. The RACH configuration may indicate power control parameters, such as a preamble received target power (P0) , a maximum quantity of preamble transmissions, or a power ramping step.
[0079] For asymmetric DL sTRP / UL mTRP deployment scenarios, a path loss offset may be a fixed value that is added to a path loss calculation to adjust for environmental, antenna, or deployment factors that affect signal strength. However, a path loss offset cannot be used for initial access RACH. Rather, a path loss offset is supported for PDCCH-ordered PRACH, which is after an RRC connection. Furthermore, the transmission power for initial access RACH may be associated with interference or RF saturation. A transmission power that is too low may cause signal degradation that wastes signaling resources and reduces throughput. A transmission power that is too high may waste power and increases the interference.
[0080] As indicated above, Fig. 3 is provided as an example. Other examples may differ from what is described with regard to Fig. 3.
[0081] Fig. 4 is a diagram illustrating an example 400 associated with configuring power control parameters, in accordance with the present disclosure. As shown in Fig. 4, a network entity 410 (e.g., network node 110) and a UE 420 (e.g., UE 120) may communicate with one another via a wireless network (e.g., wireless communication network 100) .
[0082] According to various aspects described herein, a network entity may configure a UE with multiple sets of power control parameters for a RACH message (e.g., PRACH message or a MsgA preamble) , where each set of power control parameters may include a target receive power value (e.g., preambleReceivedTargetPower or msgA-PreambleReceivedTargetPower) , a power ramp up step value (e.g., powerRampingStep or msgA-PreamblePowerRampingStep) , and / or a maximum quantity of preamble transmissions (e.g., preambleTransMax) . The UE may select a set of power control parameters from the multiple sets based at least in part on a rule, such as whether a RACH message is to be transmitted towards a DL TRP, towards a UL TRP (e.g., UL-only TRP) , or towards either a DL TRP or a UL TRP (both the DL TRP and the UL TRP will listen) . For example, there may be one set of power control parameters for a transmission to a DL TRP and another set of power control parameters for a transmission to a UL-only TRP. Alternatively, there may be one set of power control parameters for a transmission to a DL TRP and another set of power control parameters for a transmission to a UL TRP with limited DL. Alternatively, there may be one set of power control parameters for a transmission to a DL TRP and another set of power control parameters for a transmission to either DL TRP or UL TRP. The UE may transmit the PRACH message using the selected set of power control parameters. By being configuring with multiple sets of power control parameters and selecting a set of power control parameters based on a rule, the UE may use an appropriate transmit power to conserve power or to use an appropriate power to avoid signal degradation, which conserves signaling resources, reduces interference, and increases throughput.
[0083] Example 400 shows configuration of the UE 420. As shown by reference number 425, the network entity 410 may transmit one or more RACH configurations 422 to the UE 420. The one or more RACH configurations 422 may indicate a plurality of sets of power control parameters, shown by sets of power control parameters 424, 426, and 428. A set of power of control parameters, such as set of power control parameters 424, may include a target receive power 432, a power ramp up step 434, and a maximum quantity of preamble transmissions 436.
[0084] In some aspects, multiple RACH configurations may be configured via an SIB1, and a set of power control parameters may be configured for each RACH configuration. This can be applied to both UL TRPs with limited DL and UL-only TRPs. For UL TRPs with limited DL, different RACH configurations may be configured for different TRPs, and / or different RACH configurations may be associated with different SSBs or SSB groups. The UE 420 may determine which set of power control parameters to use based at least in part on which RACH configuration is selected for RACH transmission. As shown by reference number 430, the UE 420 may select the set of power control parameters (e.g., set of power control parameters 424, set of power control parameters 426, or set of power control parameters 428) . As shown by reference number 435, the UE 420 may transmit a RACH message (e.g., a PRACH message) using the set of power control parameters.
[0085] The UE 420 may select the set of power control parameters based at least in part on a rule. In some aspects, the rule specifies selection of the set of power control parameters is based at least in part on a set of power control parameters associated with the RACH configuration. In some aspects, the rule specifies selection of the set of power control parameters is based at least in part on a signal threshold (e.g., minimum RSRP for an SSB) for the RACH configuration being satisfied.
[0086] For a UL-only TRP, there is no SSB from the UL-only TRP. Therefore, there may be difference considerations for determining which power control parameters or which RACH configuration are to be used for a RACH transmission. In some aspects, the network entity 410 may indicate the set of power control parameters to select via a SIB1. The network entity 410 may also indicate whether a RACH message (e.g., PRACH message) is to be transmitted towards a DL TRP or a UL-only TRP. In some aspects, the UE 420 may select the set of power control parameters based at least in part on whether a signal threshold (e.g., an SSB-RSRP threshold) in the RACH configuration 422 (corresponding to the DL TRP) is satisfied (e.g., exceeds the threshold) . If the SSB-RSRP threshold is satisfied, the UE 420 may use the set of power control parameters in the RACH configuration 422 to transmit the RACH message. Otherwise, the UE 420 may use a set of power control parameters in a second RACH configuration to transmit the RACH message. Alternatively, the UE 420 may randomly select a set of power control parameters from the plurality of sets of power control parameters.
[0087] In some aspects, the UE 420 may transmit RACH messages using different sets of power control parameters until initial access succeeds or until all sets of power control parameters are used. As shown by reference number 440, the UE 420 may perform multiple attempts of the RACH procedure. The UE 420 may first initiate a RACH procedure using a first set of power control parameters. If the RACH procedure succeeds, the PRACH procedure is terminated. Otherwise, the UE 420 attempts to transmit the PRACH message (in another RACH procedure) using a different set of power control parameters until initial access succeeds or until all of the sets of power control parameters of the plurality of sets of control parameters are used.
[0088] In some aspects, a single RACH configuration may be configured via a SIB1, and the plurality of sets of power control parameters may be configured in a single RACH configuration. Each set of power control parameters may be configured per SSB or per SSB group. This can be applied to UL-only TRPs or UL TRPs with limited DL. For different TRPs, different SSB / SSB groups may be configured. For a UL-only TRP, to determine the RACH occasion, virtual SSBs may be configured in the SSB / SSB group associated with the UL-only TRP. In this case, the UE 420 may select the set of power control parameters to use based at least in part on a selected SSB / SSB group.
[0089] In some aspects, each set of power control parameters may be configured per RACH occasion (RO) or per RO group. This can be applied to both UL-only TRPs or UL TRPs with limited DL. For different TRPs, different RO / RO groups may be configured. In this case, the UE 420 may select the set of power control parameters to use based on the selected RO / RO group.
[0090] In some aspects, for UL-only TRPs, a path loss is included in the PRACH power control formula, and the path loss is based at least in part on the DL RS (e.g., measurement of the DL RS) from a DL TRP. In this case, the separate P0 may operate as a path loss offset. Alternatively, the path loss is not included in the PRACH power control formula.
[0091] In some aspects, for a UL TRP with limited DL, the path loss may be included in the PRACH power control formula, and the path loss may be based at least in part on the DL RS from the UL TRP with limited DL. In this case, a separate P0 and other power control parameters may be used to control the received power or step size separately between DL TRPs and UL TRPs with limited DL considering the capability or interference between different TRPs can be different.
[0092] As indicated above, Fig. 4 is provided as an example. Other examples may differ from what is described with regard to Fig. 4.
[0093] Fig. 5 is a diagram illustrating an example 500 associated with configuring power control parameters, in accordance with the present disclosure.
[0094] In some aspects, the network entity 410 may configure the UE 420 with one or more path loss offsets for PRACH or MsgA preamble power control via a SIB1 or an RRC message (for an RRC-connected UE) . As shown by reference number 505, the network entity 410 may transmit an indication of one or more path loss offsets (e.g., path loss offset 502) . Whether or not a path loss offset is applied (or which PL offset is applied) is based at least in part on whether a RACH message is to be transmitted towards a DL TRP, towards a UL-only TRP, or towards either a DL TRP or a UL-only TRP (both DL TRPs and UL TRPs will listen) . In some aspects, the path loss offset may be applied on top of the path loss in the power control formula.
[0095] As shown by reference number 510, the UE 420 may determine the transmission power for the RACH message. The UE 420 may use the power control formula and determine whether to include a path loss offset (and / or what value for the path loss offset) in the power control formula. In some aspects, the UE 420 may determine the path loss offset based at least in part on a path loss offset configured per RACH configuration. For UL-only TRPs, there may be several considerations when determining the path loss (e.g., associated with a RACH configuration) . If a RACH configuration is not configured with a path loss offset, the path loss offset may not be used if the RACH configuration is used. In some aspects, the network entity 410 may indicate the path loss offset (s) in a SIB1. In some aspects, the UE 420 may select the path loss offset based at least in part on whether a signal threshold (e.g., SSB-RSRP threshold) in a RACH configuration (corresponding to the DL TRP) is satisfied. If the SSB-RSRP threshold is satisfied, the UE 420 may use the path loss offset in the RACH configuration to transmit the RACH message. As shown by reference number 515, the UE 420 may transmit a RACH message (e.g., PRACH message) using the transmission power determined from the power control formula. Otherwise, the UE 420 may use the path loss offset in a second RACH configuration to transmit the RACH message. The UE 420 may also randomly select the path loss offset in one of the RACH configurations to transmit the RACH message.
[0096] In some aspects, the UE 420 may transmit RACH messages using different path loss offsets until initial access succeeds or until all path loss offsets are used. As shown by reference number 520, the UE 420 may transmit repetitions of the PRACH message (perform multiple attempts of the RACH procedure) . The UE 420 may first initiate a RACH procedure using a first path loss offset. If the RACH procedure succeeds, the RACH procedure is terminated. Otherwise, the UE 420 attempts to transmit the PRACH message using a different path loss offset until initial access succeeds or until all of the path loss offsets configured for the UE are used.
[0097] In some aspects, each path loss offset may be configured per SSB or SSB group. This can be applied to UL-only TRPs or to UL TRPs with limited DL. For different TRPs, different SSBs or SBS groups can be configured. For UL-only TRPs, to determine the RACH occasion, virtual SSBs can be configured in the SSBs or SSB groups. In this case, the UE 420 may determine which path loss offset to use based at least in part on the selected SSB or SSB group.
[0098] In some aspects, each path loss offset may be configured per RO or per RO group. This can be applied to UL-only TRPs or UL TRPs with limited DL. For different TRPs, different RO / RO groups may be configured. In this case, the UE 420 may select the path loss offset to use based at least in part on the selected RO / RO group. By configuring the UE 420 with a path loss offset for UL-only TRPs or UL TRPs with limited DL, the UE 420 may use a more appropriate transmission power for a UL-TRP deployment. As a result, throughput is increased and signaling resources are conserved (not wasted by degradation) .
[0099] As indicated above, Fig. 5 is provided as an example. Other examples may differ from what is described with regard to Fig. 5.
[0100] Fig. 6 is a diagram illustrating an example process 600 performed, for example, at a UE or an apparatus of a UE, in accordance with the present disclosure. Example process 600 is an example where the apparatus or the UE (e.g., UE 420) performs operations associated with power control for initial access.
[0101] As shown in Fig. 6, in some aspects, process 600 may include receiving a RACH configuration that configures a plurality of sets of power control parameters, where each set of power control parameters includes one or more of a target receive power value, a power ramp up step value, or a maximum quantity of preamble transmissions (block 610) . For example, the UE (e.g., using reception component 802 and / or communication manager 806, depicted in Fig. 8) may receive a RACH configuration that configures a plurality of sets of power control parameters, where each set of power control parameters includes one or more of a target receive power value, a power ramp up step value, or a maximum quantity of preamble transmissions, as described above.
[0102] As further shown in Fig. 6, in some aspects, process 600 may include selecting a set of power control parameters from the plurality of sets of power control parameters based at least in part on a rule (block 620) . For example, the UE (e.g., using communication manager 806, depicted in Fig. 8) may select a set of power control parameters from the plurality of sets of power control parameters based at least in part on a rule, as described above.
[0103] As further shown in Fig. 6, in some aspects, process 600 may include transmitting a RACH message using the selected set of power control parameters (block 630) . For example, the UE (e.g., using transmission component 804 and / or communication manager 806, depicted in Fig. 8) may transmit a RACH message using the selected set of power control parameters, as described above.
[0104] Process 600 may include additional aspects, such as any single aspect or any combination of aspects described below and / or in connection with one or more other processes described elsewhere herein.
[0105] In a first aspect, the rule specifies selection of the set of power control parameters is based at least in part on whether the RACH message is transmitted to an uplink-only TRP, a downlink TRP, or either an uplink-only TRP or a downlink TRP.
[0106] In a second aspect, alone or in combination with the first aspect, receiving the RACH configuration includes receiving the RACH configuration in a SIB1 that includes a plurality of RACH configurations, and where each RACH configuration configures a set of power control parameters of the plurality of sets of power control parameters.
[0107] In a third aspect, alone or in combination with one or more of the first and second aspects, the RACH configuration is specific to a transmit receive point, an SSB, or an SSB group.
[0108] In a fourth aspect, alone or in combination with one or more of the first through third aspects, the SIB1 indicates which set of power control parameters is to be used for the RACH message.
[0109] In a fifth aspect, alone or in combination with one or more of the first through fourth aspects, the rule specifies selection of the set of power control parameters is based at least in part on a set of power control parameters associated with the RACH configuration.
[0110] In a sixth aspect, alone or in combination with one or more of the first through fifth aspects, the rule specifies selection of the set of power control parameters is based at least in part on a signal threshold for the RACH configuration being satisfied.
[0111] In a seventh aspect, alone or in combination with one or more of the first through sixth aspects, process 600 includes repeating transmission of the RACH message using a different set of power control parameters of the plurality of sets of power control parameters for each repeated transmission until initial access is successful or until all of the plurality of sets of power control parameters have been used for the repeated transmissions.
[0112] In an eighth aspect, alone or in combination with one or more of the first through seventh aspects, receiving the RACH configuration includes receiving the RACH configuration in a SIB1 that includes a single RACH configuration, and the RACH configuration configures the plurality of sets of power control parameters.
[0113] In a ninth aspect, alone or in combination with one or more of the first through eighth aspects, each set of power control parameters of the plurality of sets of power control parameters is configured per SSB or per SSB group.
[0114] In a tenth aspect, alone or in combination with one or more of the first through ninth aspects, each set of power control parameters of the plurality of sets of power control parameters is configured per RO or per RO group.
[0115] In an eleventh aspect, alone or in combination with one or more of the first through tenth aspects, a path loss is included in a power control formula with the selected set of power control parameters, where the path loss is based at least in part on a downlink reference signal from a downlink TRP, and transmitting the RACH message includes transmitting the RACH message to an uplink-only TRP using the power control formula.
[0116] In a twelfth aspect, alone or in combination with one or more of the first through eleventh aspects, a path loss is not included in a power control formula with the selected set of power control parameters.
[0117] In a thirteenth aspect, alone or in combination with one or more of the first through twelfth aspects, a path loss is included in a power control formula with the selected set of power control parameters, where the path loss is based at least in part on a downlink reference signal from an uplink TRP with limited downlink, and transmitting the RACH message includes transmitting the RACH message to the uplink TRP with limited downlink using the power control formula.
[0118] Although Fig. 6 shows example blocks of process 600, in some aspects, process 600 may include additional blocks, fewer blocks, different blocks, or differently arranged blocks than those depicted in Fig. 6. Additionally, or alternatively, two or more of the blocks of process 600 may be performed in parallel.
[0119] Fig. 7 is a diagram illustrating an example process 700 performed, for example, at a UE or an apparatus of a UE, in accordance with the present disclosure. Example process 700 is an example where the apparatus or the UE (e.g., UE 420) performs operations associated with power control for initial access.
[0120] As shown in Fig. 7, in some aspects, process 700 may include receiving an indication of one or more path loss offsets for initial access power control (block 710) . For example, the UE (e.g., using reception component 802 and / or communication manager 806, depicted in Fig. 8) may receive an indication of one or more path loss offsets for initial access power control, as described above.
[0121] As further shown in Fig. 7, in some aspects, process 700 may include transmitting a RACH message using a path loss offset of the one or more path loss offsets based at least in part on whether the RACH message is to be transmitted to a downlink TRP, an uplink-only TRP, or either a downlink TRP or an uplink-only TRP (block 720) . For example, the UE (e.g., using transmission component 804 and / or communication manager 806, depicted in Fig. 8) may transmit a RACH message using a path loss offset of the one or more path loss offsets based at least in part on whether the RACH message is to be transmitted to a downlink TRP, an uplink-only TRP, or either a downlink TRP or an uplink-only TRP, as described above.
[0122] Process 700 may include additional aspects, such as any single aspect or any combination of aspects described below and / or in connection with one or more other processes described elsewhere herein.
[0123] In a first aspect, receiving the indication of the path loss offset includes receiving the indication in a SIB1, and each path loss offset is configured per RACH configuration.
[0124] In a second aspect, alone or in combination with the first aspect, transmitting the RACH message includes transmitting the RACH message using the path loss offset, based at least in part on a signal threshold for a RACH configuration being satisfied.
[0125] In a third aspect, alone or in combination with one or more of the first and second aspects, process 700 includes repeating transmission of the RACH message using a different path loss offset for each repeated transmission until initial access is successful or until all path loss offsets configured for the UE have been used for the repeated transmissions.
[0126] In a fourth aspect, alone or in combination with one or more of the first through third aspects, the path loss offset is configured per SSB, per SSB group, per RO, or per RO group.
[0127] In a fifth aspect, alone or in combination with one or more of the first through fourth aspects, the path loss offset is applied in addition to a path loss in a power control formula, where the path loss is based at least in part on a downlink reference signal from a downlink TRP, and transmitting the RACH message includes transmitting the RACH message to an uplink-only TRP using the power control formula.
[0128] 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.
[0129] Fig. 8 is a diagram of an example apparatus 800 for wireless communication, in accordance with the present disclosure. The apparatus 800 may be a UE, or a UE may include the apparatus 800. In some aspects, the apparatus 800 includes a reception component 802, a transmission component 804, and / or a communication manager 806, which may be in communication with one another (for example, via one or more buses and / or one or more other components) . In some aspects, the communication manager 806 is the communication manager 150 described in connection with Fig. 1. As shown, the apparatus 800 may communicate with another apparatus 808, such as a UE or a network node (such as a CU, a DU, an RU, or a base station) , using the reception component 802 and the transmission component 804. The communication manager 806 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.
[0130] In some aspects, the apparatus 800 may be configured to perform one or more operations described herein in connection with Figs. 1-5. Additionally, or alternatively, the apparatus 800 may be configured to perform one or more processes described herein, such as process 600 of Fig. 6, process 700 of Fig. 7, or a combination thereof. In some aspects, the apparatus 800 and / or one or more components shown in Fig. 8 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. 8 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.
[0131] The reception component 802 may receive communications, such as reference signals, control information, data communications, or a combination thereof, from the apparatus 808. The reception component 802 may provide received communications to one or more other components of the apparatus 800. In some aspects, the reception component 802 may perform signal processing on the received communications, and may provide the processed signals to the one or more other components of the apparatus 800. In some aspects, the reception component 802 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.
[0132] The transmission component 804 may transmit communications, such as reference signals, control information, data communications, or a combination thereof, to the apparatus 808. In some aspects, one or more other components of the apparatus 800 may generate communications and may provide the generated communications to the transmission component 804 for transmission to the apparatus 808. In some aspects, the transmission component 804 may perform signal processing on the generated communications, and may transmit the processed signals to the apparatus 808. In some aspects, the transmission component 804 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 804 may be co-located with the reception component 802.
[0133] The communication manager 806 may support operations of the reception component 802 and / or the transmission component 804. For example, the communication manager 806 may receive information associated with configuring reception of communications by the reception component 802 and / or transmission of communications by the transmission component 804. Additionally, or alternatively, the communication manager 806 may generate and / or provide control information to the reception component 802 and / or the transmission component 804 to control reception and / or transmission of communications.
[0134] In some aspects, the reception component 802 may receive a RACH configuration that configures a plurality of sets of power control parameters, where each set of power control parameters includes one or more of a target receive power value, a power ramp up step value, or a maximum quantity of preamble transmissions. The communication manager 806 may select a set of power control parameters from the plurality of sets of power control parameters based at least in part on a rule. The transmission component 804 may transmit a RACH message using the selected set of power control parameters.
[0135] The communication manager 806 may repeat transmission of the RACH message using a different set of power control parameters of the plurality of sets of power control parameters for each repeated transmission until initial access is successful or until all of the plurality of sets of power control parameters have been used for the repeated transmissions.
[0136] In some aspects, the reception component 802 may receive an indication of one or more path loss offsets for initial access power control. The transmission component 804 may transmit a RACH message using a path loss offset ebased at least in part on whether the RACH message is to be transmitted to a downlink TRP, an uplink-only TRP, or either a downlink TRP or an uplink-only TRP.
[0137] The communication manager 806 may repeat transmission of the RACH message using a different path loss offset for each repeated transmission until initial access is successful or until all path loss offsets configured for the UE have been used for the repeated transmissions.
[0138] The number and arrangement of components shown in Fig. 8 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. 8. Furthermore, two or more components shown in Fig. 8 may be implemented within a single component, or a single component shown in Fig. 8 may be implemented as multiple, distributed components. Additionally, or alternatively, a set of (one or more) components shown in Fig. 8 may perform one or more functions described as being performed by another set of components shown in Fig. 8.
[0139] The following provides an overview of some Aspects of the present disclosure:
[0140] Aspect 1: A method of wireless communication performed by a user equipment (UE) , comprising: receiving a random access channel (RACH) configuration that configures a plurality of sets of power control parameters, wherein each set of power control parameters includes one or more of a target receive power value, a power ramp up step value, or a maximum quantity of preamble transmissions; selecting a set of power control parameters from the plurality of sets of power control parameters based at least in part on a rule; and transmitting a RACH message using the selected set of power control parameters.
[0141] Aspect 2: The method of Aspect 1, wherein the rule specifies selection of the set of power control parameters is based at least in part on whether the RACH message is transmitted to an uplink-only transmit receive point (TRP) , a downlink TRP, or either an uplink-only TRP or a downlink TRP.
[0142] Aspect 3: The method of any of Aspects 1-2, wherein receiving the RACH configuration includes receiving the RACH configuration in a system information block one (SIB1) that includes a plurality of RACH configurations, and wherein each RACH configuration configures a set of power control parameters of the plurality of sets of power control parameters.
[0143] Aspect 4: The method of Aspect 3, wherein the RACH configuration is specific to a transmit receive point, a synchronization signal block (SSB) , or an SSB group.
[0144] Aspect 5: The method of Aspect 3, wherein the SIB1 indicates which set of power control parameters is to be used for the RACH message.
[0145] Aspect 6: The method of any of Aspects 1-5, wherein the rule specifies selection of the set of power control parameters is based at least in part on a set of power control parameters associated with the RACH configuration.
[0146] Aspect 7: The method of any of Aspects 1-6, wherein the rule specifies selection of the set of power control parameters is based at least in part on a signal threshold for the RACH configuration being satisfied.
[0147] Aspect 8: The method of any of Aspects 1-7, further comprising repeating transmission of the RACH message using a different set of power control parameters of the plurality of sets of power control parameters for each repeated transmission until initial access is successful or until all of the plurality of sets of power control parameters have been used for the repeated transmissions.
[0148] Aspect 9: The method of any of Aspects 1-8, wherein receiving the RACH configuration includes receiving the RACH configuration in a system information block one (SIB1) that includes a single RACH configuration, and wherein the RACH configuration configures the plurality of sets of power control parameters.
[0149] Aspect 10: The method of Aspect 9, wherein each set of power control parameters of the plurality of sets of power control parameters is configured per synchronization signal block (SSB) or per SSB group.
[0150] Aspect 11: The method of Aspect 9, wherein each set of power control parameters of the plurality of sets of power control parameters is configured per RACH occasion (RO) or per RO group.
[0151] Aspect 12: The method of any of Aspects 1-11, wherein a path loss is included in a power control formula with the selected set of power control parameters, wherein the path loss is based at least in part on a downlink reference signal from a downlink transmit receive point (TRP) , and wherein transmitting the RACH message includes transmitting the RACH message to an uplink-only TRP using the power control formula.
[0152] Aspect 13: The method of any of Aspects 1-12, wherein a path loss is not included in a power control formula with the selected set of power control parameters.
[0153] Aspect 14: The method of any of Aspects 1-13, wherein a path loss is included in a power control formula with the selected set of power control parameters, wherein the path loss is based at least in part on a downlink reference signal from an uplink transmit receive point (TRP) with limited downlink, and wherein transmitting the RACH message includes transmitting the RACH message to the uplink TRP with limited downlink using the power control formula.
[0154] Aspect 15: A method of wireless communication performed by a user equipment (UE) , comprising: receiving an indication of one or more path loss offsets for initial access power control; and transmitting a random access channel (RACH) message using a path loss offset of the one or more path loss offsets based at least in part on whether the RACH message is to be transmitted to a downlink transmit receive point (TRP) , an uplink-only TRP, or either a downlink TRP or an uplink-only TRP.
[0155] Aspect 16: The method of Aspect 15, wherein receiving the indication of the one or more path loss offsets includes receiving the indication in a system information block one (SIB1) , and wherein each of the one or more path loss offsets is configured per RACH configuration.
[0156] Aspect 17: The method of any of Aspects 15-16, wherein transmitting the RACH message includes transmitting the RACH message using the path loss offset, based at least in part on a signal threshold for a RACH configuration being satisfied.
[0157] Aspect 18: The method of any of Aspects 15-17, further comprising repeating transmission of the RACH message using a different path loss offset for each repeated transmission until initial access is successful or until all path loss offsets configured for the UE have been used for the repeated transmissions.
[0158] Aspect 19: The method of any of Aspects 15-18, wherein the path loss offset is configured per synchronization signal block (SSB) , per SSB group, per RACH occasion (RO) , or per RO group.
[0159] Aspect 20: The method of any of Aspects 15-19, wherein the path loss offset is applied in addition to a path loss in a power control formula, wherein the path loss is based at least in part on a downlink reference signal from a downlink transmit receive point (TRP) , and wherein transmitting the RACH message includes transmitting the RACH message to an uplink-only TRP using the power control formula.
[0160] Aspect 21: 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 1-20.
[0161] Aspect 22: 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 1-20.
[0162] Aspect 23: An apparatus for wireless communication, the apparatus comprising at least one means for performing the method of one or more of Aspects 1-20.
[0163] Aspect 24: 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 1-20.
[0164] Aspect 25: 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 1-20.
[0165] Aspect 26: 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 1-20.
[0166] Aspect 27: 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 1-20.
[0167] The foregoing disclosure provides illustration and description but is not intended to be exhaustive or to limit the aspects to the precise forms disclosed. Modifications and variations may be made in light of the above disclosure or may be acquired from practice of the aspects. No element, act, or instruction described herein should be construed as critical or essential unless explicitly described as such.
[0168] 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. The actual specialized control hardware or software used to implement these systems or methods is not limiting of the aspects. Thus, the operation and behavior of the systems or methods are described herein without reference to specific software code, because those skilled in the art will understand that software and hardware can be designed to implement the systems or methods based, at least in part, on the description herein. 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.
[0169] 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. ” Further, as used herein, the article “the” is intended to include one or more items referenced in connection with the article “the” and may be used interchangeably with “the one or more. ” Furthermore, as used herein, the terms “set” and “group” are intended to include one or more items and may be used interchangeably with “one or more. ” Where only one item is intended, the phrase “only one” or “a single one” or similar language is used. 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 may also have B) . Also, as used herein, the term “or” is intended to be inclusive when used in a series and may be used interchangeably with “and / or, ” unless explicitly stated otherwise (for example, if used in combination with “either” or “only one of” ) . As used herein, a phrase referring to “at least one of” a list of items refers to any combination of those items, including single members. As an example, “at least one of: a, b, or c” is intended to cover a, b, c, a + b, a + c, b + c, and a + b + c, as well as any combination with multiples of the same element (for example, a + a, a + a + a, a + a + b, a + a + c, a + b + b, a + c + c, b + b, b + b + b, b + b + c, c + c, and c + c + c, or any other ordering of a, b, and c) .
[0170] As used herein, the term “determine” or “determining” encompasses a wide variety of actions and, therefore, “determining” can include calculating, computing, processing, deriving, estimating, investigating, looking up (such as via looking up in a table, a database, or another data structure) , searching, inferring, ascertaining, and / or measuring, among other possibilities. Also, “determining” can include receiving (such as receiving information) , accessing (such as accessing data stored in memory) or transmitting (such as transmitting information) , among other possibilities. Additionally, “determining” can include resolving, selecting, obtaining, choosing, establishing, and / or other such similar actions.
[0171] As used herein, the phrase “based on” is intended to mean “based at least in part on” or “based on or otherwise in association with” unless explicitly stated otherwise. 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.
[0172] 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.An apparatus for wireless communication at a user equipment (UE) , comprising:one or more memories; andone or more processors, coupled to the one or more memories, individually or collectively configured to cause the UE to:receive a random access channel (RACH) configuration that configures a plurality of sets of power control parameters, wherein each set of power control parameters includes one or more of a target receive power value, a power ramp up step value, or a maximum quantity of preamble transmissions;select a set of power control parameters from the plurality of sets of power control parameters based at least in part on a rule; andtransmit a RACH message using the selected set of power control parameters.2.The apparatus of claim 1, wherein the rule specifies selection of the set of power control parameters is based at least in part on whether the RACH message is transmitted to an uplink-only transmit receive point (TRP) , a downlink TRP, or either an uplink-only TRP or a downlink TRP.3.The apparatus of claim 1, wherein to receive the RACH configuration, the one or more processors are individually or collectively configured to receive the RACH configuration in a system information block one (SIB1) that includes a plurality of RACH configurations, and wherein each RACH configuration configures a set of power control parameters of the plurality of sets of power control parameters.4.The apparatus of claim 3, wherein the RACH configuration is specific to a transmit receive point, a synchronization signal block (SSB) , or an SSB group.5.The apparatus of claim 3, wherein the SIB1 indicates which set of power control parameters is to be used for the RACH message.6.The apparatus of claim 1, wherein the rule specifies selection of the set of power control parameters is based at least in part on a set of power control parameters associated with the RACH configuration.7.The apparatus of claim 1, wherein the rule specifies selection of the set of power control parameters is based at least in part on a signal threshold for the RACH configuration being satisfied.8.The apparatus of claim 1, wherein the one or more processors are individually or collectively configured to cause the UE to repeat transmission of the RACH message using a different set of power control parameters of the plurality of sets of power control parameters for each repeated transmission until initial access is successful or until all of the plurality of sets of power control parameters have been used for the repeated transmissions.9.The apparatus of claim 1, wherein to receive the RACH configuration, the one or more processors are individually or collectively configured to receive the RACH configuration in a system information block one (SIB1) that includes a single RACH configuration, and wherein the RACH configuration configures the plurality of sets of power control parameters.10.The apparatus of claim 9, wherein each set of power control parameters of the plurality of sets of power control parameters is configured per synchronization signal block (SSB) or per SSB group.11.The apparatus of claim 9, wherein each set of power control parameters of the plurality of sets of power control parameters is configured per RACH occasion (RO) or per RO group.12.The apparatus of claim 1, wherein a path loss is included in a power control formula with the selected set of power control parameters, wherein the path loss is based at least in part on a downlink reference signal from a downlink transmit receive point (TRP) , and wherein to transmit the RACH message, the one or more processors are individually or collectively configured to transmit the RACH message to an uplink-only TRP using the power control formula.13.The apparatus of claim 1, wherein a path loss is not included in a power control formula with the selected set of power control parameters.14.The apparatus of claim 1, wherein a path loss is included in a power control formula with the selected set of power control parameters, wherein the path loss is based at least in part on a downlink reference signal from an uplink transmit receive point (TRP) with limited downlink, and wherein to transmit the RACH message, the one or more processors are individually or collectively configured to transmit the RACH message to the uplink TRP with limited downlink using the power control formula.15.An apparatus for wireless communication at a user equipment (UE) , comprising:one or more memories; andone or more processors, coupled to the one or more memories, individually or collectively configured to cause the UE to:receive an indication of one or more path loss offsets for initial access power control; andtransmit a random access channel (RACH) message using a path loss offset of the one or more path loss offsets based at least in part on whether the RACH message is to be transmitted to a downlink transmit receive point (TRP) , an uplink-only TRP, or either a downlink TRP or an uplink-only TRP.16.The apparatus of claim 15, wherein receiving the indication of the one or more path loss offsets includes receiving the indication in a system information block one (SIB1) , and wherein each of the one or more path loss offsets is configured per RACH configuration.17.The apparatus of claim 15, wherein to cause the UE to transmit the RACH message, the one or more processors are individually or collectively configured to cause the UE to transmit the RACH message using the path loss offset, based at least in part on a signal threshold for a RACH configuration being satisfied.18.The apparatus of claim 15, wherein the one or more processors are individually or collectively configured to cause the UE to repeat transmission of the RACH message using a different path loss offset for each repeated transmission until initial access is successful or until all path loss offsets configured for the UE have been used for the repeated transmissions.19.The apparatus of claim 15, wherein the path loss offset is configured per synchronization signal block (SSB) , per SSB group, per RACH occasion (RO) , or per RO group.20.The apparatus of claim 15, wherein the path loss offset is applied in addition to a path loss in a power control formula, wherein the path loss is based at least in part on a downlink reference signal from a downlink transmit receive point (TRP) , and wherein to transmit the RACH message, the one or more processors are individually or collectively configured to transmit the RACH message to an uplink-only TRP using the power control formula.