Carrier selection for random access based on downlink transmit-receive points and uplink transmit-receive points
Patent Information
- Application Number
- PCT/CN2025/084576
- Authority / Receiving Office
- WO · WO
- Patent Type
- Applications
- Current Assignee / Owner
- Filing Date
- 2025-03-25
- Publication Date
- 2026-10-01
Smart Images

Figure CN2025084576_01102026_PF_FP_ABST
Abstract
Description
CARRIER SELECTION FOR RANDOM ACCESS BASED ON DOWNLINK TRANSMIT-RECEIVE POINTS AND UPLINK TRANSMIT-RECEIVE POINTSFIELD OF THE DISCLOSURE
[0001] Aspects of the present disclosure generally relate to wireless communication and specifically relate to techniques, apparatuses, and methods associated with carrier selection for random access based on downlink transmit-receive points (TRPs) and uplink TRPs. DESCRIPTION OF THE RELATED TECHNOLOGY
[0002] Wireless communication systems are widely deployed to provide various services, which may involve carrying or supporting voice, text, other messaging, video, data, or other traffic. Typical wireless communication systems may employ multiple-access radio access technologies (RATs) capable of supporting communication among multiple wireless communication devices including user devices or other devices by sharing the available system resources (for example, time domain resources, frequency domain resources, spatial domain resources, or device transmit power, among other examples) . Such multiple-access RATs are supported by technological advancements that have been adopted in various telecommunication standards, which define common protocols that enable different wireless communication devices to communicate on a local, municipal, national, regional, or global level. An example telecommunication standard is New Radio (NR) . NR, which also may be referred to as 5G, is part of a continuous mobile broadband evolution promulgated by the Third Generation Partnership Project (3GPP) . As the demand for connectivity continues to increase, further improvements in NR may be implemented, and other RATs, such as 6G and beyond, may be introduced to enable new applications and facilitate new use cases.SUMMARY
[0003] The systems, methods, and devices of this disclosure each have several innovative aspects, no single one of which is solely responsible for the desirable attributes disclosed herein.
[0004] In some implementations, an apparatus for wireless communication at a user equipment (UE) includes one or more memories; and one or more processors, coupled to the one or more memories, configured to cause the UE to: receive a configuration that indicates a plurality of signal power thresholds, wherein: a signal power threshold of the plurality of signal power thresholds is associated with a set of downlink reference signals, the set of downlink reference signals includes a first set of downlink reference signals associated with a downlink transmit-receive point (TRP) or a second set of downlink reference signals associated with an uplink TRP, and the signal power threshold is associated with an uplink carrier or a supplementary uplink (SUL) carrier; and select one of the uplink carrier or the SUL carrier and one of the first set of downlink reference signals or the second set of downlink reference signals based at least in part on whether a signal power of a set of downlink reference signals satisfies the signal power threshold, and in accordance with a priority order; and transmit signaling associated with a random access based at least in part on the uplink carrier or the SUL carrier, and based at least in part on the first set of downlink reference signals or the second set of downlink reference signals.
[0005] In some implementations, a method of wireless communication performed by a UE includes receiving a configuration that indicates a plurality of signal power thresholds, wherein: a signal power threshold of the plurality of signal power thresholds is associated with a set of downlink reference signals, the set of downlink reference signals includes a first set of downlink reference signals associated with a downlink TRP or a second set of downlink reference signals associated with an uplink TRP, and the signal power threshold is associated with an uplink carrier or an SUL carrier; and selecting one of the uplink carrier or the SUL carrier and one of the first set of downlink reference signals or the second set of downlink reference signals based at least in part on whether a signal power of a set of downlink reference signals satisfies the signal power threshold, and in accordance with a priority order; and transmitting signaling associated with a random access based at least in part on the uplink carrier or the SUL carrier, and based at least in part on the first set of downlink reference signals or the second set of downlink reference signals.
[0006] In some implementations, a non-transitory computer-readable medium storing a set of instructions for wireless communication includes one or more instructions that, when executed by one or more processors of a UE, cause the UE to: receive a configuration that indicates a plurality of signal power thresholds, wherein: a signal power threshold of the plurality of signal power thresholds is associated with a set of downlink reference signals, the set of downlink reference signals includes a first set of downlink reference signals associated with a downlink TRP or a second set of downlink reference signals associated with an uplink TRP, and the signal power threshold is associated with an uplink carrier or an SUL carrier; and select one of the uplink carrier or the SUL carrier and one of the first set of downlink reference signals or the second set of downlink reference signals based at least in part on whether a signal power of a set of downlink reference signals satisfies the signal power threshold, and in accordance with a priority order; and transmit signaling associated with a random access based at least in part on the uplink carrier or the SUL carrier, and based at least in part on the first set of downlink reference signals or the second set of downlink reference signals.
[0007] In some implementations, an apparatus for wireless communication includes means for receiving a configuration that indicates a plurality of signal power thresholds, wherein: a signal power threshold of the plurality of signal power thresholds is associated with a set of downlink reference signals, the set of downlink reference signals includes a first set of downlink reference signals associated with a downlink TRP or a second set of downlink reference signals associated with an uplink TRP, and the signal power threshold is associated with an uplink carrier or an SUL carrier; and means for selecting one of the uplink carrier or the SUL carrier and one of the first set of downlink reference signals or the second set of downlink reference signals based at least in part on whether a signal power of a set of downlink reference signals satisfies the signal power threshold, and in accordance with a priority order; and means for transmitting signaling associated with a random access based at least in part on the uplink carrier or the SUL carrier, and based at least in part on the first set of downlink reference signals or the second set of downlink reference signals.
[0008] Aspects of the present disclosure may generally be implemented by or as a method, apparatus, system, computer program product, non-transitory computer-readable medium, user equipment, network node, wireless communication device, or processing system as substantially described in the Detailed Description with reference to, and as illustrated by, the accompanying drawings. Details of one or more implementations of the subject matter described in this disclosure are set forth in the accompanying drawings and the description below. Other features, aspects, and advantages will become apparent from the description, the drawings, and the claims. Note that the relative dimensions of the following figures may not be drawn to scale.BRIEF DESCRIPTION OF THE DRAWINGS
[0009] Fig. 1 is a diagram illustrating an example of a wireless network.
[0010] Fig. 2 is a diagram illustrating an example of a supplementary uplink.
[0011] Fig. 3 is a diagram illustrating an example of an uplink dense deployment.
[0012] Fig. 4 is a diagram illustrating an example of an uplink dense deployment with limited downlink functions.
[0013] Fig. 5 is a diagram illustrating an example of a transmit-receive point (TRP) scenario.
[0014] Fig. 6 is a diagram illustrating an example of a TRP scenario.
[0015] Fig. 7 is a diagram illustrating an example of a TRP scenario.
[0016] Fig. 8 is a diagram illustrating an example of a TRP scenario.
[0017] Fig. 9 is a diagram illustrating an example associated with carrier selection for random access based on downlink TRPs and uplink TRPs.
[0018] Fig. 10 is a flowchart illustrating an example process performed, for example, by a user equipment (UE) .
[0019] Fig. 11 is a diagram of an example apparatus for wireless communication.DETAILED DESCRIPTION
[0020] In conjunction with an uplink / downlink (UL / DL) carrier pair, which may be associated with a frequency division duplexing (FDD) band, or a bidirectional carrier, which may be associated with a time division duplexing (TDD) band, a user equipment (UE) may be configured with an additional supplementary uplink (SUL) . SUL may differ from an aggregated uplink in that the UE may be scheduled to transmit either on the SUL or on an uplink of a carrier being supplemented, but not on both the SUL and the uplink at the same time. In other words, SUL may differ from a carrier aggregation that aggregates multiple uplink carriers.
[0021] In case of SUL, the UE may be configured with two uplink carriers for one downlink carrier of the same cell. Uplink transmissions on the two uplink carriers may be controlled by a network node to avoid overlapping physical uplink shared channel (PUSCH) or physical uplink control channel (PUCCH) transmissions in time. Overlapping PUSCH transmissions may be avoided via scheduling, whereas overlapping PUCCH transmissions may be avoided via a configuration. For example, a PUCCH transmission may be configured for only one of the two uplink carriers of the cell. In addition, an initial access may be supported in each uplink carrier.
[0022] An uplink transmit-receive point (TRP) in an uplink dense environment may be used to enhance an uplink coverage. SUL may also be used for an uplink coverage enhancement. When an uplink TRP is deployed in an SUL frequency, the uplink coverage may be further enhanced. A combination of the uplink TRP and SUL may be beneficial for the uplink coverage enhancement. When the uplink TRP is deployed in SUL, various deployment scenarios may be considered. In a first scenario or first case, both a downlink TRP and an uplink TRP may have an SUL carrier and an uplink carrier. In a second scenario or second case, a downlink TRP may have both an SUL carrier and an uplink carrier, and an uplink TRP may have an SUL carrier (e.g., only SUL) . In a third scenario or third case, a downlink TRP may have an uplink carrier (e.g., only uplink) , and an uplink TRP may have both an SUL carrier and an uplink carrier. In a fourth scenario or fourth case, a downlink TRP may have an uplink carrier (e.g., only uplink) , and an uplink TRP may have an SUL carrier (e.g., only SUL) .
[0023] In a legacy system, physical random access channel (PRACH) resources may be selected after an uplink carrier selection. A measured quality of a downlink transmission may be used as a metric for the uplink carrier selection. In one example, the uplink carrier selection may involve a selection of a subcarrier spacing, a selection of frequency domain dimensions of a resource grid for a PRACH preamble transmission, and / or a selection of an appropriate numerology for a current bandwidth part (BWP) . For an asymmetric downlink and uplink TRP, when an uplink TRP is associated with a limited downlink functionality (e.g., the uplink TRP is able to transmit a synchronization signal block (SSB) or a channel state information (CSI) reference signal (CSI-RS) ) , the measured quality of the downlink transmission may be different between a downlink TRP and the uplink TRP. However, a UE may be unable to determine whether to perform the uplink carrier selection using the measured quality of the downlink transmission in relation to the downlink TRP or the uplink TRP. In other words, the UE may not be configured to select between the measured quality of the downlink transmission associated with the downlink TRP or the measured quality of the downlink transmission associated with the uplink TRP, which may affect the uplink carrier selection. Further, an uplink-only TRP may not be associated with any downlink signal / channel, in which case the UE may be unable to measure a quality of a downlink transmission from the uplink TRP. The UE may not be able to correctly perform the uplink carrier selection when the UE is unable to measure the quality of the downlink transmission. As a result, the UE may be unable to correctly perform the uplink carrier selection, which may degrade an overall system performance.
[0024] Various aspects relate generally to carrier selection for random access. Some aspects more specifically relate to carrier selection for random access based on downlink TRPs and uplink TRPs. In some examples, a UE may receive, from a network node, a configuration that indicates a plurality of signal power thresholds. The plurality of signal power thresholds may be reference signal received power (RSRP) thresholds. A signal power threshold of the plurality of signal power thresholds may be associated with a set of downlink reference signals (e.g., CSI-RS or SSB) . The set of downlink reference signals may include a first set of downlink reference signals associated with a downlink TRP or a second set of downlink reference signals associated with an uplink TRP. The signal power threshold may be associated with an uplink carrier or an SUL carrier. The UE may select one of the uplink carrier or the SUL carrier and one of the first set of downlink reference signals or the second set of downlink reference signals based at least in part on whether a signal power of a set of downlink reference signals satisfies the signal power threshold, and in accordance with a priority order. The UE may perform an uplink / SUL carrier selection for asymmetric downlink and uplink TRPs (e.g., when a number of downlink TRPs is different than a number of uplink TRPs) . The UE may transmit, to the network node, signaling associated with a random access based at least in part on the uplink carrier or the SUL carrier, and based at least in part on the first set of downlink reference signals or the second set of downlink reference signals.
[0025] Particular aspects of the subject matter described in this disclosure can be implemented to realize one or more of the following potential advantages. In some examples, by configuring the UE with the plurality of signal power thresholds, where each signal power threshold is associated with a set of downlink reference signals and a given uplink / SUL carrier, the described techniques can be used by the UE to select an uplink carrier or an SUL carrier and the first set of downlink reference signals or the second set of downlink reference signals based at least in part on whether the signal power of the set of downlink reference signals satisfies the signal power threshold. The UE may determine whether to use a measured quality of a downlink of the downlink TRP or the uplink TRP, which may be different for asymmetric downlink TRPs and uplink TRPs, for an uplink / SUL carrier selection. By configuring the UE to appropriately use the measured quality of the downlink from the downlink TRP or the uplink TRP, the UE may be able to effectively perform the uplink / SUL carrier selection in a presence of asymmetric downlink TRPs and uplink TRPs. The uplink / SUL carrier selection may impact a selection of PRACH resources, so enabling the UE to effectively perform the uplink / SUL carrier selection may thereby improve an overall system performance.
[0026] 5G New Radio (NR) may support enhanced mobile broadband (eMBB) access, Internet of Things (IoT) networks or reduced capability (RedCap) device deployments, ultra-reliable low-latency communication (URLLC) applications, or massive machine-type communication (mMTC) , among other examples. To support these and other target verticals, a wireless communication system may be designed to implement a modularized functional infrastructure, a disaggregated and service-based network architecture, network function virtualization, network slicing, multi-access edge computing, millimeter wave (mmWave) technologies including massive multiple-input multiple-output (MIMO) , beamforming, IoT device or RedCap device connectivity and management, industrial connectivity, licensed and unlicensed spectrum access, sidelink and other device-to-device direct communication (for example, cellular vehicle-to-everything (CV2X) communication) , frequency spectrum expansion, overlapping spectrum use, small cell deployments, non-terrestrial network (NTN) deployments, device aggregation, advanced duplex communication (for example, sub-band full-duplex (SBFD) ) , multiple-subscriber implementations, high-precision positioning, radio frequency (RF) sensing, network energy savings (NES) , low-power signaling and radios, or artificial intelligence or machine learning (AI / ML) , among other examples.
[0027] The foregoing and other technological improvements may support use cases, such as wireless fronthauls, wireless midhauls, wireless backhauls, wireless data centers, extended reality (XR) and metaverse applications, meta services for supporting vehicle connectivity, holographic and mixed reality communication, autonomous and collaborative robots, vehicle platooning and cooperative maneuvering, sensing networks, gesture monitoring, human-brain interfacing, digital twin applications, asset management, and universal coverage applications using non-terrestrial or aerial platforms, among other examples.
[0028] The methods, operations, apparatuses, and techniques described herein may enable one or more of the foregoing technologies or new technologies or support one or more of the foregoing use cases or new use cases.
[0029] Fig. 1 is a diagram illustrating an example of a wireless communication network 100. The wireless communication network 100 may be or may include elements of a 5G network or a 6G network, among other examples. The wireless communication network 100 may include multiple network nodes 110. For example, in Fig. 1, the wireless communication network 100 includes multiple network nodes 110, including a network node 110a and a network node 110b (each of which also may be referred to herein simply as a “network node 110” ) . The network nodes 110 may support communications with multiple UEs 120. For example, in Fig. 1, the network nodes 110 support communication with a UE 120a, a UE 120b, and a UE 120c (each of which also may be referred to herein simply as a “UE 120” ) . In some examples, a UE 120 also may communicate with other UEs 120 and a network node 110 also may communicate with a core network and with other network nodes 110.
[0030] The network nodes 110 and the UEs 120 of the wireless communication network 100 communicate using the electromagnetic spectrum, which may be subdivided into various licensed or unlicensed operating bands, frequency ranges, component carriers, or channels that define associated frequencies available for communications. In some examples, each of the network nodes 110 and the UEs 120 may communicate using one or multiple component carriers in one or more operating bands or ranges. Typically, various operating bands are defined as frequency range designations FR1 (410 MHz through 7.125 GHz) , FR2 (24.25 GHz through 52.6 GHz) , FR3 (7.125 GHz through 24.25 GHz) , FR4a or FR4-1 (52.6 GHz through 71 GHz) , FR4 (52.6 GHz through 114.25 GHz) , and FR5 (114.25 GHz through 300 GHz) . Although a portion of FR1 is greater than 6 GHz, FR1 is often referred to (interchangeably) as a “sub-6 GHz” band in some documents and articles. Similarly, FR2 is often referred to (interchangeably) as a “millimeter wave” band in some documents and articles.
[0031] A network node 110 or a UE 120 may include one or more devices, components, or systems that enable communication with other devices, components, or systems of the wireless communication network 100. For example, a UE 120 and a network node 110 may each include one or more chips, system-on-chips (SoCs) , chipsets, packages, or devices that individually or collectively constitute or comprise a processing system. As shown in Fig. 1, each UE 120 includes a processing system 140 and each network node 110 includes a processing system 145. A processing system (for example, the processing system 140 or the processing system 145) includes processor (or “processing” ) circuitry in the form of one or multiple processors, microprocessors, processing units (such as central processing units (CPUs) , graphics processing units (GPUs) , neural processing units (NPUs) (also referred to as neural network processors or deep learning processors (DLPs) ) , or digital signal processors (DSPs) ) , processing blocks, application-specific integrated circuits (ASICs) , programmable logic devices (PLDs) , or other discrete gate or transistor logic or circuitry (any one or more of which may be generally referred to herein individually as a “processor” or collectively as “the processor” or “the processor circuitry” ) . Such processors may be individually or collectively configurable or configured to perform various functions or operations described herein. A group of processors collectively configurable or configured to perform a set of functions may include a first processor configurable or configured to perform a first function of the set and a second processor configurable or configured to perform a second function of the set. In some other examples, each of a group of processors may be configurable or configured to perform a same set of functions.
[0032] The processing system 140 and the processing system 145 may each include memory circuitry in the form of one or multiple memory devices, memory blocks, memory elements, or other discrete gate or transistor logic or circuitry, each of which may include or implement tangible storage media, such as random-access memory, or read-only memory, or combinations thereof (any one or more of which may be generally referred to herein individually as a “memory” or collectively as “the memory” or “the memory circuitry” ) . One or more of the memories may be coupled (for example, operatively coupled, communicatively coupled, electronically coupled, or electrically coupled) with one or more of the processors. One or more of the memories may individually or collectively store processor-executable code or instructions (such as software) (for example, which may be referred to as “one or more code-storing memories” or “code-storing memory circuitry” ) . For example, “code-storing memory” or “code-storing memory circuitry” refers to memory (or memory circuitry) that is configured to store processor-executable code or instructions. The processor-executable code or instructions, when executed by one or more of the processors, may configure one or more of the processors (or processing circuitry) to perform various functions or operations described herein. Additionally, or alternatively, in some examples, one or more of the processors may be configured to perform various functions or operations described herein without requiring configuration by software. Software shall be construed broadly to mean instructions, instruction sets, code, code segments, program code, programs, subprograms, software modules, applications, software applications, software packages, routines, subroutines, objects, executables, threads of execution, procedures, or functions, among other examples, whether referred to as software, firmware, middleware, microcode, hardware description language, or otherwise.
[0033] The processing system 140 and the processing system 145 may each include or be coupled with one or more modems (such as a cellular (for example, a 5G or 6G compliant) modem) . In some examples, one or more processors of the processing system 140 or the processing system 145 may include or implement one or more of the modems. The processing system 140 and the processing system 145 also may include or be coupled with multiple radios (collectively “the radio” ) , multiple RF chains, or multiple transceivers, each of which may in turn be coupled with one or more of multiple antennas. In some examples, one or more processors of the processing system 140 or the processing system 145 may include or implement one or more of the radios, RF chains, or transceivers. An RF chain may include one or more filters, mixers, oscillators, amplifiers, analog-to-digital converters (ADCs) , or other devices that convert between an analog signal (such as for transmission or reception via an air interface) and a digital signal (such as for processing by the processing system 140 or by the processing system 145) .
[0034] 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.
[0035] A network node 110 may be, may include, or also may be referred to as an NR network node, a 5G network node, a 6G network node, a Node B, a gNB, an access point (AP) , a TRP, a network entity, a network element, a network equipment, or another type of device, component, or system included in a radio access network (RAN) . In various deployments, a network node 110 may be implemented as a single physical node (for example, a single physical structure) or may be implemented as two or more physical nodes (for example, two or more distinct physical structures) . For example, a network node 110 may be a device or system that implements a part of a radio protocol stack, a device or system that implements a full radio protocol stack (such as a full gNB protocol stack) , or a collection of devices or systems that collectively implement the full radio protocol stack. For example, and as shown, a network node 110 may be an aggregated network node having an aggregated architecture, meaning that the network node 110 may implement a full radio protocol stack that is physically and logically integrated within a single physical structure in the wireless communication network 100. For example, an aggregated network node 110 may include a single standalone base station or a single TRP that operates with a full radio protocol stack to enable or facilitate communication between a UE 120 and a core network of the wireless communication network 100.
[0036] Alternatively, a network node 110 may be a disaggregated network node 110 (sometimes referred to as a disaggregated base station) , having a disaggregated architecture, meaning that the network node 110 may operate with a radio protocol stack that is physically distributed or logically distributed among two or more nodes in the same geographic location or in different geographic locations. In some deployments, disaggregated network nodes 110 may be used in an integrated access and backhaul (IAB) network, in an open radio access network (O-RAN) (such as a network configuration in compliance with the O-RAN Alliance) , or in a virtualized radio access network (vRAN) , also known as a cloud radio access network (C-RAN) , to facilitate scaling by separating network functionality into multiple units or modules that can be individually deployed.
[0037] The disaggregated network nodes 110 of the wireless communication network 100 may include one or more central units (CUs) , one or more distributed units (DUs) , and one or more radio units (RUs) . A CU may host one or more higher layers, such as a radio resource control (RRC) layer, a packet data convergence protocol (PDCP) layer, and a service data adaptation protocol (SDAP) layer, among other examples. A CU can communicate with a core network either directly (for example, via a backhaul link) or indirectly (for example, via one or more disaggregated control units, such as a non-real-time (Non-RT) RAN intelligent controller (RIC) associated with a Service Management and Orchestration (SMO) framework or a near-real-time (Near-RT) RIC) . A DU may host one or more of a radio link control (RLC) layer, a medium access control (MAC) layer, or one or more higher physical (PHY) layers depending, at least in part, on a functional split, such as a functional split defined by the 3GPP. In some examples, a DU also may host a lower PHY layer that is configured to perform functions, such as a fast Fourier transform (FFT) , an inverse FFT (IFFT) , beamforming, or PRACH extraction and filtering, among other examples. An RU may perform RF processing functions or lower PHY layer functions, such as an FFT, an IFFT, beamforming, or PRACH extraction and filtering, among other examples, according to a functional split, such as a lower layer split (LLS) . In such an architecture, each RU can be operated to handle over the air (OTA) communication with one or more UEs 120. A CU may communicate with one or more DUs via respective midhaul links, such as via F1 interfaces. Each of the DUs may communicate with one or more RUs via respective fronthaul links. Each of the RUs may communicate with one or more UEs 120 via respective RF access links. In some deployments, a UE 120 may be simultaneously served by multiple RUs.
[0038] In some examples, a single network node 110 may include a combination of one or more CUs, one or more DUs, or one or more RUs. In some examples, a CU, a DU, or an RU may be implemented as a virtual unit, such as a virtual central unit (VCU) , a virtual distributed unit (VDU) , or a virtual radio unit (VRU) , among other examples, which may be implemented as a virtual network function, such as in a cloud deployment (for example, an open cloud (O-Cloud) platform) . An SMO framework may support RAN deployment and provisioning of non-virtualized and virtualized network elements.
[0039] In some examples, the wireless communication network 100 may be a heterogeneous network that includes network nodes 110 of various types. Different types of network nodes 110 may generally operate on the same or different operating bands, transmit at different power levels, or serve different coverage areas, each of which may be referred to as or associated with a particular cell 130 (for example, a cell 130a and a cell 130b) .
[0040] The UEs 120 may be physically dispersed throughout the coverage area of the wireless communication network 100, and each UE 120 may be stationary or mobile. A UE 120 may be, may include, or also may be referred to as an access terminal, a mobile station, a client device, or a subscriber unit. A UE 120 may be, include, or be coupled with a cellular phone (for example, a smart phone) , a personal digital assistant (PDA) , a wireless modem, a wireless communication device, a handheld device, a laptop computer, a cordless phone, a wireless local loop (WLL) station, a tablet, a camera, a netbook, a smartbook, an ultrabook, a medical device, a biometric device, a wearable device (for example, a smart watch, smart clothing, smart glasses, a smart wristband, or smart jewelry) , a gaming device, an entertainment device (for example, a music device, a video device, or a satellite radio) , an XR device, a vehicular component or sensor, a smart meter or sensor, industrial manufacturing equipment, a Global Navigation Satellite System (GNSS) device (such as a Global Positioning System device or another type of positioning device) , an artificially intelligent robot or other device implementing artificial intelligence, a UE function of a network node, or any other suitable device or function that may communicate in the wireless communication network 100.
[0041] Some UEs 120 may be classified according to different categories in association with different complexities or different capabilities. UEs 120 in a first category may be associated with relatively low complexity or cost such as NB-IoT devices or eMTC UEs. UEs 120 in a second category may include higher complexity or cost devices, such as mission-critical IoT devices, baseline UEs, high-tier UEs, advanced UEs, full-capability UEs, or premium UEs that are capable of URLLC, eMBB, or precise positioning in the wireless communication network 100. A third category of UEs 120 may have mid-tier complexity or capabilities (for example, capabilities between that of the UEs 120 of the first category and the UEs 120 of the second category) . A UE 120 of the third category may be referred to as a reduced capability UE ( “RedCap UE” ) , a mid-tier UE, an NR-Light UE, or an NR-Lite UE, among other examples.
[0042] 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) .
[0043] Frequency domain resources may be subdivided into BWPs. A BWP may be a block of frequency domain resources (for example, a continuous set of resource blocks (RBs) within a full component carrier bandwidth) that may be configured at a UE-specific level. A UE 120 may be configured with both an uplink BWP and a downlink BWP (which may be the same or different) . Each BWP may be associated with its own numerology (indicating a sub-carrier spacing (SCS) and cyclic prefix (CP) ) . A BWP may be dynamically configured or activated (for example, by a network node 110 transmitting a downlink control information (DCI) configuration to the one or more UEs 120) or reconfigured (for example, in real-time or near-real-time) according to changing network conditions in the wireless communication network 100 or specific requirements of one or more UEs 120. An active BWP defines the operating bandwidth of the UE 120 within the operating bandwidth of the serving cell.
[0044] 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 CSI-RS, among other examples. A downlink signal carrying control information or data may be transmitted via a downlink channel. Downlink channels may include one or more control channels for transmitting control information and one or more data channels for transmitting data. Downlink reference signals may be transmitted in addition to, or multiplexed with, downlink control channel communications or downlink data channel communications. A downlink control channel may be specifically used to transmit DCI from a network node 110 to a UE 120. DCI generally contains the information the UE 120 needs to identify RBs in a subsequent subframe and how to decode them, including a modulation and coding scheme (MCS) or redundancy version parameters. Different DCI formats carry different information, such as scheduling information in the form of downlink or uplink grants, slot format indicators (SFIs) , preemption indicators (PIs) , transmit power control (TPC) commands, hybrid automatic repeat request (HARQ) information, new data indicators (NDIs) , among other examples. A downlink data channel may be used to transmit downlink data (for example, user data associated with a UE 120) from a network node 110 to a UE 120. Downlink control channels may include physical downlink control channels (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.
[0045] As used herein, an uplink signal may include a reference signal, control information, or data. For example, uplink reference signals include a sounding reference signal (SRS) , a PTRS, and a DMRS, among other examples. An uplink signal carrying control information or data may be transmitted via an uplink channel. An uplink channel may include one or more control channels for transmitting control information and one or more data channels for transmitting data. Uplink reference signals may be transmitted in addition to, or multiplexed with, uplink control channel communications or uplink data channel communications. An uplink control channel may be specifically used to transmit uplink control information (UCI) from a UE 120 to a network node 110. An uplink data channel may be used to transmit uplink data (for example, user data associated with a UE 120) from a UE 120 to a network node 110. Uplink control channels may include PUCCHs, and uplink data channels may include PUSCHs. Control information or data communications may be transmitted on a PUCCH and PUSCH, respectively. For example, a PUCCH can carry UCI, while a PUSCH can carry a MAC-CE, an RRC message, or user data, among other examples. UCI can include a scheduling request (SR) , HARQ feedback information (for example, a HARQ acknowledgement (ACK) indication or a HARQ negative acknowledgement (NACK) indication) , uplink power control information (for example, an uplink TPC parameter) , or CSI, among other examples. CSI can include a channel quality indicator (CQI) (indicative of downlink channel conditions to facilitate selection of transmission parameters, such as an MCS, by a network node 110) , a precoding matrix indicator (PMI) , a CSI-RS resource indicator (CRI) (for example, indicative of a beam used to transmit a CSI-RS) , an SS / PBCH resource block indicator (SSBRI) (for example, indicative of a beam used to transmit an SSB) , a layer indicator (LI) , a rank indicator (RI) , or measurement information (for example, a layer 1 (L1) -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.
[0046] The information (for example, data, control information, or reference signal information) transmitted by a network node 110 to a UE 120, or vice versa, may be represented as a sequence of binary bits that are mapped (for example, modulated) to an analog signal waveform (for example, a discrete Fourier transform (DFT) -spread-orthogonal frequency division multiplexing (OFDM) (DFT-s-OFDM) waveform or a CP-OFDM waveform) that is transmitted by the network node 110 or UE 120 over a wireless communication channel. In some examples, the network node 110 or the UE 120 (for example, using the processing system 145 or the processing system 140, respectively) may select an MCS (for example, an order of quadrature amplitude modulation (QAM) , such as 64-QAM, 128-QAM, or 256-QAM, among other examples) for a downlink signal or an uplink signal. For example, the network node 110 may select an MCS for a downlink signal in accordance with UCI received from the UE 120 or may transmit, to the UE 120, an indication of an MCS to be applied for an uplink signal.
[0047] A network node 110 or a UE 120 (such as by using the processing system 145 or the processing system 140, respectively, or one or more coupled modems) may perform signal processing on the information (such as filtering, amplification, modulation, digital-to-analog conversion, an IFFT operation, multiplexing, interleaving, mapping, or encoding, among other examples) to generate a processed signal in accordance with the selected MCS. In some examples, the network node 110 or the UE 120 (for example, using the processing system 145 or the processing system 140, respectively, or one or more coupled encoders or modems) may perform a channel coding operation or a forward error correction (FEC) operation to control errors in transmitted information. For example, the network node 110 or the UE 120 may perform an encoding operation to generate encoded information (such as by selectively introducing redundancy into the information, typically using an error correction code (ECC) , such as a polar code or a low-density parity-check (LDPC) code) . The network node 110 or the UE 120 (for example, using the processing system 145 or one or more modems) may further perform spatial processing (for example, precoding) on the encoded information to generate one or more processed or precoded signals for downlink or uplink transmission, respectively. In some examples, the network node 110a or the UE 120a may perform codebook-based precoding or non-codebook-based precoding. Codebook-based precoding may involve selecting a precoder (for example, a precoding matrix) using a codebook. For example, the network node 110a may provide precoding information indicating which precoder, defined by the codebook, is to be used by the UE 120a. Non-codebook-based precoding may involve selecting or deriving a precoder based on, or otherwise associated with, one or more downlink or uplink signal measurements. The network node 110a or the UE 120a may transmit the processed downlink or uplink signals, respectively, via one or more antennas.
[0048] The network node 110a or the UE 120a may receive uplink signals or downlink signals, respectively, via one or more antennas. The network node 110a or the UE 120a (for example, using the processing system 145 or the processing system 140, respectively, or one or more coupled modems) may perform signal processing (for example, in accordance with the MCS) on the received uplink or downlink signals, respectively (such as filtering, amplification, demodulation, analog-to-digital conversion, an FFT operation, demultiplexing, deinterleaving, de-mapping, equalization, interference cancellation, or decoding, among other examples) , to map the received signal (s) to a sequence of binary bits (for example, received information) that estimates the information transmitted by the network node 110 or the UE 120 via the downlink or uplink signals. The network node 110a or the UE 120a (for example, using the processing system 145 or the processing system 140, respectively, or a coupled decoder or one or more modems) may decode the received information (such as by using an ECC, a decoding operation, or an FEC operation) to detect errors or correct bit errors in the received information to generate decoded information. The decoded information may estimate the information transmitted via the downlink or uplink signals.
[0049] In some examples, a UE 120 and a network node 110 may perform MIMO communication. MIMO communication generally refers to transmitting or receiving multiple signals (such as multiple layers or multiple data streams) simultaneously over the same time and frequency resources. A network node 110 or a UE 120 may communicate using single-user MIMO or multi-user MIMO (MU-MIMO) , the latter of which being used by a network node 110 to simultaneously transmit signals to multiple UEs 120. MIMO techniques may involve spatial multiplexing (multi-layer transmission) or beamforming. To implement beamforming, the amplitudes or phases of signals transmitted via antenna elements may be modulated and shifted relative to each other (such as by manipulating a phase shift, a phase offset, or an amplitude) to generate one or more beams. For example, a network node 110 may generate one or more beams 160a, and a UE 120 may generate one or more beams 160b. The term “beam” may refer to a directional transmission of a wireless signal toward a receiving device or otherwise in a desired direction, a directional reception of a wireless signal from a transmitting device or otherwise in a desired direction, a direction associated with such a directional transmission or directional reception, a set of directional resources associated with a signal transmission or signal reception (for example, an angle of arrival, a horizontal direction, or a vertical direction) , or a set of parameters or resources associated with one or more aspects of a directional signal, among other examples.
[0050] In some examples, a network node 110 or a UE 120 may implement massive MIMO, which may be associated with an increased (for example, “massive” ) quantity of antennas at the network node 110 or at the UE 120, such as in a network implementing mmWave technology, which enables more precise beamforming or reduced interference. In some examples, the wireless communication network 100 may implement multi-TRP (mTRP) operation (including redundant transmission or reception on multiple TRPs) or non-coherent joint transmission (NC-JT) .
[0051] The network node 110 and the UE 120 may establish a communication link or beam pair, and otherwise increase reliability, throughput, signal strength, or other signal properties for MIMO communications, by performing beam management operations, such as an initial beam acquisition operation, a beam refinement operation, or a beam recovery operation. For example, an initial beam acquisition operation may involve the network node 110 transmitting signals (for example, SSBs or other signals) via respective beams (for example, of the beams 160 of the network node 110) and the UE 120 receiving and measuring the signal (s) via respective beams of multiple beams (for example, from the beams 160 of the UE 120) to identify a best beam (or beam pair) for communication between the UE 120 and the network node 110. A beam refinement operation may involve a first device (for example, the UE 120 or the network node 110) transmitting signal (s) via a subset of beams (for example, identified based on, or otherwise associated with, measurements reported as part of one or more other beam management operations) . A second device (for example, the network node 110 or the UE 120) may receive the signal (s) via a single beam (for example, to identify the best beam for communication from the subset of beams) . The beam (s) may be identified or defined via one or more spatial parameters, such as a transmission configuration indicator (TCI) state or a quasi co-location (QCL) parameter, among other examples.
[0052] Some aspects and techniques as described herein may be implemented, at least in part, using an artificial intelligence (AI) program (for example, referred to herein as an “AI / ML model” ) , such as a program that includes a machine learning (ML) model or an artificial neural network (ANN) model. The AI / ML model may be deployed at one or more devices 165 (for example, one or more network nodes 110, one or more UEs 120, one or more servers, or one or more components of a cloud computing network, among other examples) . For example, in a deployment in which AI / ML functionality is performed independently at a device 165, sometimes referred to as “overlay AI / ML, ” the AI / ML model (or an instance or portion of the AI / ML model) may be deployed at a UE 120 (for example, by the processing system 140) , a network node 110 (for example, by the processing system 145) , one or more servers, or one or more components of a cloud computing network, among other examples. Additionally, or alternatively, in a deployment where AI / ML functionality is coordinated between different devices 165, sometimes referred to as “coordinated AI / ML, ” or performed at all device and network layers, sometimes referred to as “native AI / ML, ” the AI / ML model (or an instance of the AI / ML model) may be deployed at multiple devices 165 (for example, a first portion of the AI / ML model may be deployed at a UE 120 and a second portion of the AI / ML model may be deployed at a network node 110) . In other examples of coordinated AI / ML or native AI / ML, a first AI / ML model may be deployed at a UE 120 and a second AI / ML model may be deployed at a network node 110. The AI / ML model (s) may be configured to enhance various aspects of the wireless communication network 100 (for example, to increase privacy, reliability, or efficient use of network bandwidth, or to reduce latency, among other examples) . For example, the AI / ML model (s) may be trained to identify patterns or relationships in data corresponding to the wireless communication network 100, a device, or an air interface, among other examples. The AI / ML model (s) may support operational decisions relating to one or more aspects associated with wireless communications devices, networks, or services.
[0053] Accordingly, in some examples, the AI / ML model (s) may enable AI-as-a-Service (for example, an end-to-end AI / ML service via a user plane) for use cases, such as a self-organizing network (SON) , minimization of drive test (MDT) , quality of experience (QoE) , positioning, sensing, predictive mobility, or traffic prediction, among other examples. In some examples, AI-as-a-Service use cases may include measurement collection reporting by a UE 120, device selection criteria (for example, according to a geographical area where measurements are to be collected or UE capabilities to be used to collected measurements) , or reporting configurations (for example, reporting parameters such as location, time, or sensor information, among other examples) . Additionally, or alternatively, the AI / ML model (s) may enable AI / ML procedures (for example, RAN-triggered service establishment, configuration, inferencing using UE-side or network-side models, performance monitoring or management, or capability signaling, among other examples) . Additionally, or alternatively, the AI / ML model (s) may enable RAN-based AI / ML services via one or more application program interfaces (APIs) or management interfaces for use cases, such as beam management, radio resource monitoring (RRM) relaxation, mobility prediction, load prediction, network energy savings, or coverage and capacity improvements, among other examples.
[0054] In some aspects, a UE (e.g., the UE 120) may include a communication manager 150. As described in more detail elsewhere herein, the communication manager 150 may receive a configuration that indicates a plurality of signal power thresholds, wherein: a signal power threshold of the plurality of signal power thresholds is associated with a set of downlink reference signals, the set of downlink reference signals includes a first set of downlink reference signals associated with a downlink TRP or a second set of downlink reference signals associated with an uplink TRP, and the signal power threshold is associated with an uplink carrier or an SUL carrier; and select one of the uplink carrier or the SUL carrier and one of the first set of downlink reference signals or the second set of downlink reference signals based at least in part on whether a signal power of a set of downlink reference signals satisfies the signal power threshold, and in accordance with a priority order; and transmit signaling associated with a random access based at least in part on the uplink carrier or the SUL carrier, and based at least in part on the first set of downlink reference signals or the second set of downlink reference signals. Additionally, or alternatively, the communication manager 150 may perform one or more other operations described herein.
[0055] The network node 110, the processing system 145 of the network node 110, the UE 120, the processing system 140 of the UE 120, or any other component (s) of Fig. 1 may implement one or more techniques or perform one or more operations associated with carrier selection for random access based on downlink TRPs and uplink TRPs, as described in more detail elsewhere herein. For example, the processing system 145 of the network node 110, or the processing system 140 of the UE 120 may perform or direct operations of, for example, process 1000 of Fig. 10, or other processes as described herein (alone or in conjunction with one or more other processors) . Memory of the network node 110 may store data and program code (or instructions) for the network node 110. In some examples, the memory of the network node 110 may store data relating to a UE 120, such as RRC state information or a UE context. Memory of a UE 120 may store data and program code (or instructions) for the UE 120, such as context information. In some examples, the memory of the UE 120 or the memory of the network node 110 may include a non-transitory computer-readable medium storing a set of instructions for wireless communication. For example, the set of instructions, when executed by one or more processors (for example, of the processing system 145 or the processing system 140) of the network node 110, or the UE 120, may cause the one or more processors to perform process 1000 of Fig. 10, or other processes as described herein. In some examples, executing instructions may include running the instructions, converting the instructions, compiling the instructions, or interpreting the instructions, among other examples.
[0056] In some aspects, a UE (e.g., the UE 120) includes means for receiving a configuration that indicates a plurality of signal power thresholds, wherein: a signal power threshold of the plurality of signal power thresholds is associated with a set of downlink reference signals, the set of downlink reference signals includes a first set of downlink reference signals associated with a downlink TRP or a second set of downlink reference signals associated with an uplink TRP, and the signal power threshold is associated with an uplink carrier or an SUL carrier; or means for selecting one of the uplink carrier or the SUL carrier and one of the first set of downlink reference signals or the second set of downlink reference signals based at least in part on whether a signal power of a set of downlink reference signals satisfies the signal power threshold, and in accordance with a priority order; or means for transmitting signaling associated with a random access based at least in part on the uplink carrier or the SUL carrier, and based at least in part on the first set of downlink reference signals or the second set of downlink reference signals. 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 1102 depicted and described in connection with Fig. 11) , or a transmission component (for example, transmission component 1104 depicted and described in connection with Fig. 11) , among other examples.
[0057] As indicated above, Fig. 1 is provided as an example. Other examples may differ from what is described with regard to Fig. 1.
[0058] A serving cell configuration (ServingCellConfig) may indicate a dedicated TDD uplink-downlink configuration (tdd-UL-DL-ConfigurationDedicated) , an initial downlink BWP (initialDownlinkBWP) , a downlink BWP to release list (downlinkBWP-ToReleaseList) , a downlink BWP to add or modify list (downlinkBWP-ToAddModList) , a first active downlink BWP identifier (ID) (firstActiveDownlinkBWP-Id) , a BWP inactivity timer (bwp-InactivityTimer) , a default downlink BWP ID (defaultDownlinkBWP-Id) , an uplink configuration (uplinkConfig) , an SUL configuration (supplementaryUplink) (which may be associated with an uplink configuration) , a PDCCH serving cell configuration (pdcch-ServingCellConfig) , and / or a PDSCH serving cell configuration (pdsch-ServingCellConfig) .
[0059] A common serving cell configuration (ServingCellConfigCommon) may indicate a physical cell ID (physCellId) , a common downlink configuration (downlinkConfigCommon) , a common uplink configuration (uplinkConfigCommon) , an SUL configuration (supplementaryUplinkConfig) (which may be associated with the common uplink configuration) , a timing advance offset (n-TimingAdvanceOffset) , and / or SSB positions in burst (ssb-PositionsInBurst) . The SSB positions in burst may include a short bitmap (shortBitmap) , a medium bitmap (mediumBitmap) , and / or a long bitmap (longBitmap) .
[0060] A serving cell configuration common system information block (SIB) (ServingCellConfigCommonSIB) may indicate a common downlink configuration (downlinkConfigCommon) , a common uplink configuration (uplinkConfigCommon) (which may be associated with an uplink configuration common SIB) , an SUL (supplementaryUplink) (which may be associated with the uplink configuration common SIB) , a timing advance offset (n-TimingAdvanceOffset) , and / or SSB positions in burst (ssb-PositionsInBurst) . The uplink configuration common SIB (UplinkConfigCommonSIB) may indicate frequency information for uplink (frequencyInfoUL) , an initial uplink BWP (initialUplinkBWP) (which may be associated with an uplink common BWP) , and / or a common time alignment timer (timeAlignmentTimerCommon) . The uplink common BWP (BWP-UplinkCommon) may indicate generic parameters (genericParameters) , a common random access channel (RACH) configuration (rach-ConfigCommon) , a common PUSCH configuration (pusch-ConfigCommon) , and / or a common PUCCH configuration (pucch-ConfigCommon) . When SUL is configured in a serving cell, separate PRACH configurations may be configured between SUL and uplink.
[0061] In conjunction with an UL / DL carrier pair, which may be associated with a FDD band, or a bidirectional carrier, which may be associated with a TDD band, a UE may be configured with an additional SUL. SUL may differ from an aggregated uplink in that the UE may be scheduled to transmit either on the SUL or on an uplink of a carrier being supplemented, but not on both the SUL and the uplink at the same time. In other words, SUL may differ from a carrier aggregation that aggregates multiple uplink carriers.
[0062] In case of SUL, the UE may be configured with two uplink carriers for one downlink carrier of the same cell. Uplink transmissions on the two uplink carriers may be controlled by a network node to avoid overlapping PUSCH / PUCCH transmissions in time. Overlapping PUSCH transmissions may be avoided via scheduling, whereas overlapping PUCCH transmissions may be avoided via a configuration. For example, a PUCCH transmission may be configured for only one of the two uplink carriers of the cell. In addition, an initial access may be supported in each uplink carrier.
[0063] Fig. 2 is a diagram illustrating an example 200 of a supplementary uplink.
[0064] As shown in Fig. 2, a network node 110 may provide coverage to a UE 120. The coverage may include a downlink and uplink coverage, a downlink-only coverage, and an SUL coverage. The downlink and uplink coverage may be associated with a higher frequency as compared to the SUL coverage. In NR, a downlink carrier may be associated with two uplink carriers (e.g., a non-SUL carrier and an SUL carrier) , where the SUL carrier may be located in a lower frequency band, thereby providing enhanced uplink coverage. SUL may be configured to improve an uplink coverage for high frequency scenarios. With SUL, the UE 120 may be configured with two uplink carriers for one downlink carrier of the same cell.
[0065] As indicated above, Fig. 2 is provided as an example. Other examples may differ from what is described with regard to Fig. 2.
[0066] As part of a random access procedure, for random access in a cell configured with SUL, a network node may explicitly signal which carrier to use (e.g., an uplink carrier or SUL carrier) . Otherwise, the UE may select the SUL carrier when a measured quality of a downlink carrier is lower than a broadcast threshold. The UE may perform a carrier selection before selecting between a two-step random access (RA) type or a four-step RA type. An RSRP threshold for selecting between the two-step RA type and the four-step RA type may be configured separately for uplink and SUL. A plurality of uplink transmissions associated with the random access procedure (e.g., all uplink transmissions of the random access procedure) may remain on a selected carrier (e.g., uplink carrier or SUL carrier) after uplink transmissions are started.
[0067] The network node may associate a set of RACH resources with one or more features applicable to the random access procedure. The one or more features may be associated with network slicing, (e) RedCap, small data transmissions (SDT) , and / or an NR coverage enhancement. A set of RACH resources associated with a feature may be valid for random access procedures applicable to at least that feature. A set of RACH resources associated with several features may be valid for random access procedures having at least all of the several features. The UE may select one or more sets of applicable RACH resources, after an uplink carrier (e.g., uplink or SUL) selection and a BWP selection, and before an RA type selection. An uplink carrier may also be referred to as a normal uplink (NUL) carrier.
[0068] During a random access procedure initialization, when a serving cell for a random access procedure is configured with SUL, and when an RSRP of a downlink pathloss reference is less than an SSB SUL RSRP threshold (rsrp-ThresholdSSB-SUL) , a UE may select an SUL carrier for performing the random access procedure. The UE may set a maximum power (PCMAX) to PCMAX, f, c of the SUL carrier. Otherwise, the UE may select an uplink carrier (e.g., NUL carrier) for performing the random access procedure. The UE may set a PCMAX to PCMAX, f, c of the uplink carrier.
[0069] Fig. 3 is a diagram illustrating an example 300 of an uplink dense deployment.
[0070] As shown in Fig. 3, an uplink dense deployment may be used to improve a coverage and / or a capacity of an uplink direction. A plurality of uplink Rx points (e.g., uplink (UL) -only nodes) , such as a first UL-only node 302, a second UL-only node 304, a third UL-only node 306, and a fourth UL-only node 308, may receive uplink signals and / or uplink channels from a UE 120. Downlink signals and / or downlink channels transmitted from a network node 110 may be from a different node (e.g., a macro node, a central node, a serving cell, or a serving base station) . Uplink Rx points may be connected to the network node 110 via backhaul links. The uplink dense deployment may help to reduce an uplink pathloss, which may be helpful when an uplink coverage is a bottleneck. The uplink dense deployment may help in terms of deployment cost and / or complexity since the plurality of uplink Rx points may not transmit any downlink signal. The plurality of uplink Rx points may receive an uplink signal and send the uplink signal to the network node 110 with or without processing. In addition, an SRS may still need to be transmitted to a downlink network node, for example, for a CSI acquisition in TDD.
[0071] As indicated above, Fig. 3 is provided as an example. Other examples may differ from what is described with regard to Fig. 3.
[0072] Fig. 4 is a diagram illustrating an example 400 of an uplink dense deployment with limited downlink functions.
[0073] For a downlink single TRP (sTRP) and uplink multiple TRP (mTRP) scenario, a downlink transmission function may be implemented from an uplink TRP. The uplink TRP may be deployed with the downlink transmission function, which may be useful for power control and / or beam management. For network energy saving, the uplink TRP may be deployed with a limited downlink function. The uplink TRP may implement a relatively simple downlink baseband capability for transmitting downlink reference signals (DL RSs) . A downlink reference signal from the uplink TRP may be transmitted with a low RF capability. A single transmit beam may be supported for the downlink reference signal. A periodicity of the downlink reference signal may be larger than a periodicity of downlink reference signals transmitted by a downlink TRP. A transmit power of the downlink reference signal from the uplink TRP may be lower than a transmit power of downlink reference signals transmitted by the downlink TRP, which may match an uplink coverage the uplink TRP.
[0074] As shown in Fig. 4, a network node 110 may be associated with downlink and uplink transmissions. The network node 110 may be configured to transmit a downlink transmission to a UE 120. The network node 110 may be associated with a first uplink TRP 402 with a limited downlink function, a second uplink TRP 404 with a limited downlink function, a third uplink TRP 406 with a limited downlink function, and a fourth uplink TRP 408 with a limited downlink function. A given uplink TRP with a limited downlink function may transmit a downlink reference signal to the UE 120 and / or receive an uplink transmission from the UE 120. The downlink reference signal may be associated with a single transmit beam, a relatively large periodicity, and / or a relatively low transmit power.
[0075] As indicated above, Fig. 4 is provided as an example. Other examples may differ from what is described with regard to Fig. 4.
[0076] An uplink TRP in an uplink dense environment may be used to enhance an uplink coverage. SUL may also be used for an uplink coverage enhancement. When an uplink TRP is deployed in an SUL frequency, the uplink coverage may be further enhanced. A combination of the uplink TRP and SUL may be beneficial for the uplink coverage enhancement. When the uplink TRP is deployed in SUL, various deployment scenarios may be considered (e.g., as shown in Figs. 5-8) . In a first scenario or first case, both a downlink TRP and an uplink TRP may have an SUL carrier and an uplink carrier. In a second scenario or second case, a downlink TRP may have both an SUL carrier and an uplink carrier, and an uplink TRP may have an SUL carrier (e.g., only SUL) . In a third scenario or third case, a downlink TRP may have an uplink carrier (e.g., only uplink) , and an uplink TRP may have both an SUL carrier and an uplink carrier. In a fourth scenario or fourth case, a downlink TRP may have an uplink carrier (e.g., only uplink) , and an uplink TRP may have an SUL carrier (e.g., only SUL) .
[0077] Fig. 5 is a diagram illustrating an example 500 of a TRP scenario.
[0078] As shown in Fig. 5, a downlink TRP 502 and an uplink TRP 504 may provide coverage for a UE 120. The downlink TRP 502 may be associated with an uplink coverage, a downlink coverage, and an SUL coverage. The uplink TRP 504 may be associated with an uplink coverage and an SUL coverage. In this example (e.g., first case) , both the downlink TRP 502 and the uplink TRP 504 may have an uplink carrier and an SUL carrier.
[0079] As indicated above, Fig. 5 is provided as an example. Other examples may differ from what is described with regard to Fig. 5.
[0080] Fig. 6 is a diagram illustrating an example 600 of a TRP scenario.
[0081] As shown in Fig. 6, a downlink TRP 602 and an uplink TRP 604 may provide coverage for a UE 120. The downlink TRP 602 may be associated with an uplink coverage, a downlink coverage, and an SUL coverage. The uplink TRP 604 may be associated with an SUL coverage. In this example (e.g., second case) , the downlink TRP 602 may have both an SUL carrier and an uplink carrier, and the uplink TRP 604 may have an SUL carrier (e.g., only SUL) .
[0082] As indicated above, Fig. 6 is provided as an example. Other examples may differ from what is described with regard to Fig. 6.
[0083] Fig. 7 is a diagram illustrating an example 700 of a TRP scenario.
[0084] As shown in Fig. 7, a downlink TRP 702 and an uplink TRP 704 may provide coverage for a UE 120. The downlink TRP 702 may be associated with an uplink coverage and a downlink coverage. The uplink TRP 704 may be associated with an uplink coverage and an SUL coverage. In this example (e.g., third case) , the downlink TRP 702 may have an uplink carrier (e.g., only uplink) , and the uplink TRP 704 may have both an SUL carrier and an uplink carrier.
[0085] As indicated above, Fig. 7 is provided as an example. Other examples may differ from what is described with regard to Fig. 7.
[0086] Fig. 8 is a diagram illustrating an example 800 of a TRP scenario.
[0087] As shown in Fig. 8, a downlink TRP 802 and an uplink TRP 804 may provide coverage for a UE 120. The downlink TRP 802 may be associated with an uplink coverage and a downlink coverage. The uplink TRP 804 may be associated with an SUL coverage. In this example (e.g., fourth case) , the downlink TRP 802 may have an uplink carrier (e.g., only uplink) , and the uplink TRP 804 may have an SUL carrier (e.g., only SUL) .
[0088] As indicated above, Fig. 8 is provided as an example. Other examples may differ from what is described with regard to Fig. 8.
[0089] In a legacy system, PRACH resources may be selected after an uplink carrier selection. A measured quality of a downlink transmission may be used as a metric for the uplink carrier selection. In one example, the uplink carrier selection may involve a selection of a subcarrier spacing, a selection of a frequency domain dimensions of a resource grid for a PRACH preamble transmission, and / or a selection of an appropriate numerology for a current BWP. For an asymmetric downlink and uplink TRP, when an uplink TRP is associated with a limited downlink functionality (e.g., the uplink TRP is able to transmit an SSB or a CSI-RS) , the measured quality of the downlink transmission may be different between a downlink TRP and the uplink TRP. However, a UE may be unable to determine whether to perform the uplink carrier selection using the measured quality of the downlink transmission in relation to the downlink TRP or the uplink TRP. In other words, the UE may not be configured to select between the measured quality of the downlink transmission associated with the downlink TRP or the measured quality of the downlink transmission associated with the uplink TRP, which may affect the uplink carrier selection. Further, an uplink-only TRP may not be associated with any downlink signal / channel, in which case the UE may be unable to measure a quality of a downlink transmission from the uplink TRP. The UE may not be able to correctly perform the uplink carrier selection when the UE is unable to measure the quality of the downlink transmission. As a result, the UE may be unable to correctly perform the uplink carrier selection, which may degrade an overall system performance.
[0090] In various aspects of techniques and apparatuses described herein, a UE may receive, from a network node, a configuration that indicates a plurality of signal power thresholds. The plurality of signal power thresholds may be RSRP thresholds. A signal power threshold of the plurality of signal power thresholds may be associated with a set of downlink reference signals (e.g., CSI-RS or SSB) . The set of downlink reference signals may include a first set of downlink reference signals associated with a downlink TRP or a second set of downlink reference signals associated with an uplink TRP. The signal power threshold may be associated with an uplink carrier or an SUL carrier. The UE may select one of the uplink carrier or the SUL carrier and one of the first set of downlink reference signals or the second set of downlink reference signals based at least in part on whether a signal power of a set of downlink reference signals satisfies the signal power threshold, and in accordance with a priority order. The UE may perform an uplink / SUL carrier selection for asymmetric downlink and uplink TRPs (e.g., when a number of downlink TRPs is different than a number of uplink TRPs) . The UE may transmit, to the network node, signaling associated with a random access based at least in part on the uplink carrier or the SUL carrier, and based at least in part on the first set of downlink reference signals or the second set of downlink reference signals.
[0091] In some aspects, by configuring the UE with the plurality of signal power thresholds, where each signal power threshold is associated with a set of downlink reference signals and a given uplink / SUL carrier, the described techniques can be used by the UE to select an uplink carrier or an SUL carrier and the first set of downlink reference signals or the second set of downlink reference signals based at least in part on whether the signal power of the set of downlink reference signals satisfies the signal power threshold. The UE may determine whether to use a measured quality of a downlink of the downlink TRP or the uplink TRP, which may be different for asymmetric downlink TRPs and uplink TRPs, for an uplink / SUL carrier selection. By configuring the UE to appropriately use the measured quality of the downlink from the downlink TRP or the uplink TRP, the UE may be able to effectively perform the uplink / SUL carrier selection in a presence of asymmetric downlink TRPs and uplink TRPs. The uplink / SUL carrier selection may impact a selection of PRACH resources, so enabling the UE to effectively perform the uplink / SUL carrier selection may thereby improve an overall system performance.
[0092] Fig. 9 is a diagram illustrating an example 900 associated with carrier selection for random access based on downlink TRPs and uplink TRPs. As shown in Fig. 9, example 900 includes communication between a UE (e.g., UE 120) and a network node (e.g., network node 110) . In some aspects, the UE and the network node may be included in a wireless network, such as wireless network 100.
[0093] As shown by reference number 902, the UE may receive, from the network node, a configuration that indicates a plurality of signal power thresholds. The UE may receive the configuration via a system information block (SIB) or RRC signaling. A signal power threshold of the plurality of signal power thresholds may be associated with a set of downlink reference signals. The set of downlink reference signals may include a first set of downlink reference signals associated with a downlink TRP or a second set of downlink reference signals associated with an uplink TRP. The signal power threshold may be associated with an uplink carrier or an SUL carrier.
[0094] In some aspects, the downlink TRP may be associated with an uplink coverage and an SUL coverage, and the uplink TRP may be associated with an uplink coverage and an SUL coverage. In some aspects, the downlink TRP may be associated with an uplink coverage and an SUL coverage, and the uplink TRP may be associated with an SUL coverage. In some aspects, the downlink TRP may be associated with an uplink coverage, and the uplink TRP may be associated with an uplink coverage and an SUL coverage. In some aspects, the downlink TRP may be associated with an uplink coverage, and the uplink TRP may be associated with an SUL coverage.
[0095] As shown by reference number 904, the UE may select one of the uplink carrier or the SUL carrier and one of the first set of downlink reference signals or the second set of downlink reference signals based at least in part on whether a signal power of a set of downlink reference signals satisfies the signal power threshold, and in accordance with a priority order. The priority order may be fixed in the specification or indicated via the SIB (e.g., SIB1) . The UE may perform an uplink / SUL carrier selection for asymmetric downlink and uplink TRPs (e.g., when a number of downlink TRPs is different than a number of uplink TRPs) .
[0096] In some aspects, the plurality of signal power thresholds may include, for an uplink TRP with a limited downlink functionality, a first signal power threshold, a second signal power threshold, a third signal power threshold, and a fourth signal power threshold. The first signal power threshold may be configured for the uplink carrier and may be associated with a measured quality of a downlink associated with the first set of downlink reference signals. The second signal power threshold may be configured for the uplink carrier and may be associated with a measured quality of a downlink associated with the second set of downlink reference signals. The third signal power threshold may be configured for the SUL carrier and may be associated with the measured quality of the downlink associated with the first set of downlink reference signals. The fourth signal power threshold may be configured for the SUL carrier and may be associated with the measured quality of the downlink associated with the second set of downlink reference signals.
[0097] In some aspects, the plurality of signal power thresholds may include, for an uplink-only TRP, a first signal power threshold and a third signal power threshold. The first signal power threshold may be configured for the uplink carrier and may be associated with a measured quality of a downlink associated with the first set of downlink reference signals. The third signal power threshold may be configured for the SUL carrier and may be associated with a measured quality of a downlink associated with the first set of downlink reference signals.
[0098] In some aspects, the UE may be configured with multiple RSRP thresholds via a system information block type 1 (SIB1) or RRC signaling. Each RSRP threshold may be associated with a set of downlink reference signals and a given uplink / SUL carrier. The UE may select an uplink / SUL carrier, a first set of downlink reference signals, and a second set of downlink reference signals based at least in part on whether an RSRP of one or more corresponding downlink reference signals satisfies a corresponding RSRP threshold in accordance with a priority order.
[0099] In some aspects, the priority order may be fixed, defined in a specification, or indicated via the SIB1. For an uplink TRP with a limited downlink functionality, four RSRP thresholds may be configured. A first RSRP threshold may be configured for an uplink carrier and may be associated with a measured quality of downlink associated with the first set of downlink reference signals (uplink of downlink TRP) . A second RSRP threshold may be configured for an uplink carrier and may be associated with a measured quality of downlink associated with the second set of downlink reference signals (uplink of uplink TRP) . A third RSRP threshold may be configured for an SUL carrier and may be associated with a measured quality of downlink associated with the first set of downlink reference signals (SUL of downlink TRP) . A fourth RSRP threshold may be configured for SUL and may be associated with a measured quality of downlink associated with the second set of downlink reference signals (SUL of uplink TRP) .
[0100] In some aspects, for an uplink-only TRP, two RSRP thresholds may be configured. The two RSRP thresholds may include the first RSRP threshold and the third RSRP threshold. The first RSRP threshold may be configured for an uplink carrier and may be associated with a measured quality of downlink associated with the first set of downlink reference signals. The third RSRP threshold may be configured for an SUL carrier and may be associated with a measured quality of downlink associated with the first set of downlink reference signals.
[0101] In some aspects, the third signal power threshold and the fourth signal power threshold of the plurality of signal power thresholds may be configured in respective PRACH configurations, or the third signal power threshold and the fourth signal power threshold of the plurality of signal power thresholds may be configured via a single PRACH configuration.
[0102] In some aspects, the UE may be configured with the multiple RSRP thresholds, where the third RSRP threshold and the fourth RSRP threshold may be configured in respective PRACH configurations in an SUL, or in a single PRACH configuration where each of the third RSRP threshold and the fourth RSRP threshold may be associated with different sets of downlink reference signals (e.g., associated with different TRPs) . The first RSRP threshold and the second RSRP threshold on an uplink carrier may be configured using one or more appropriate configurations.
[0103] In some aspects, a first common RACH configuration (RACH-ConfigCommon) may indicate an RSRP threshold (e.g., rsrp-ThresholdSSB-SUL) , which may be used to check a measured quality of a downlink from a downlink TRP. A second common RACH configuration (RACH-ConfigCommon2) may indicate an RSRP threshold (e.g., rsrp-ThresholdSSB-SUL) , which may be used to check a measured quality of a downlink from an uplink TRP. In some aspects, a single common RACH configuration (RACH-ConfigCommon) may indicate a first RSRP threshold (e.g., rsrp-ThresholdSSB-SUL) , which may be used to check a measured quality of a downlink from a downlink TRP. The single common RACH configuration may indicate a second RSRP threshold (e.g., rsrp-ThresholdSSB-SUL2) , which may be used to check a measured quality of a downlink from an uplink TRP.
[0104] In some aspects, the uplink carrier or the SUL carrier, and the first set of downlink reference signals associated with the downlink TRP or the second set of downlink reference signals associated with the uplink TRP, may be selected in accordance with joint selection criteria. In some aspects, the uplink carrier or the SUL carrier may be selected prior to the first set of downlink reference signals associated with the downlink TRP or the second set of downlink reference signals associated with the uplink TRP being selected. In some aspects, the first set of downlink reference signals associated with the downlink TRP or the second set of downlink reference signals associated with the uplink TRP may be selected prior to the uplink carrier or the SUL carrier being selected.
[0105] In some aspects, criteria may be defined to select an uplink / SUL carrier and the first / second set of downlink reference signals based at least in part on whether an RSRP of one or more corresponding downlink reference signals satisfies a corresponding RSRP threshold in accordance with a priority order. In some aspects, joint selection criteria may be defined to select between an uplink carrier and an SUL carrier and between a downlink TRP and an uplink TRP. In some aspects, a hierarchical approach may be used to select between an uplink carrier and an SUL carrier and between a downlink TRP and an uplink TRP. In some aspects, the UE may first select an uplink / SUL carrier and then select between the first set of downlink reference signals or the second set of downlink reference signals (e.g., downlink TRP / uplink TRP) . In some aspects, the UE may first select between the first set of downlink reference signals or the second set of downlink reference signals (e.g., downlink TRP / uplink TRP) and then select an uplink / SUL carrier.
[0106] In some aspects, the UE may check whether the signal power of the set of downlink reference signals satisfies the signal power threshold in accordance with the priority order. The priority order may define an ordering of an uplink carrier of the downlink TRP, an uplink carrier of the uplink TRP, an SUL carrier of the downlink TRP, and an SUL carrier of the uplink TRP.
[0107] In some aspects, the uplink carrier and the first set of downlink reference signals may be selected for random access based at least in part on a measured quality of a downlink associated with the first set of downlink reference signals satisfying a first signal power threshold of the plurality of signal power thresholds. In some aspects, the uplink carrier and the second set of downlink reference signals may be selected for random access based at least in part on a measured quality of a downlink associated with the second set of downlink reference signals satisfying a second signal power threshold of the plurality of signal power thresholds. In some aspects, the SUL carrier and the first set of downlink reference signals may be selected for random access based at least in part on the measured quality of the downlink associated with the first set of downlink reference signals satisfying a third signal power threshold of the plurality of signal power thresholds. In some aspects, the SUL carrier and the second set of downlink reference signals may be selected for random access based at least in part on the measured quality of the downlink associated with the second set of downlink reference signals satisfying a fourth signal power threshold of the plurality of signal power thresholds.
[0108] In some aspects, for each configured RSRP threshold, the UE may check whether an RSRP of one or more corresponding downlink reference signals satisfies a corresponding RSRP threshold in accordance with a priority order. When an RSRP corresponding to a higher priority order is satisfied, the UE may select an uplink / SUL carrier and the set of downlink reference signals that are associated with an RSRP threshold corresponding to the higher priority order. For example, when the priority order indicates that an uplink of a downlink TRP is a higher priority than an uplink of an uplink TRP, the uplink of the uplink TRP is a higher priority than an SUL of a downlink TRP, and the SUL of the downlink TRP is a higher priority than an SUL of the uplink TRP, certain rules may be applied. When a measured quality of a downlink associated with the first set of downlink reference signals satisfies the first RSRP threshold, the UE may select an uplink carrier and the first set of downlink reference signals for random access. When a measured quality of the downlink associated with the second set of downlink reference signals satisfies the second RSRP threshold, the UE may select the uplink carrier and the second set of downlink reference signals for random access. When the measured quality of the downlink associated with the first set of downlink reference signals satisfies the third RSRP threshold, the UE may select an SUL carrier and the first set of downlink reference signals for random access. When the measured quality of the downlink associated with the second set of downlink reference signals satisfies the fourth RSRP threshold, the UE may select the SUL carrier and the second set of downlink reference signals for random access. In some aspects, other priority may be defined in a specification or indicated via a SIB1.
[0109] In some aspects, the uplink TRP may be an uplink-only TRP and the second set of downlink reference signals may not be configured. The second signal power threshold or the fourth signal power threshold may be assumed to be satisfied, the second signal power threshold or the fourth signal power threshold may be assumed not to be satisfied, or whether the second signal power threshold or the fourth signal power threshold is assumed to be satisfied may be based at least in part on a random determination at the UE.
[0110] In some aspects, to extend to an uplink-only TRP, the UE may check whether the RSRP of the one or more corresponding downlink reference signals satisfies the corresponding RSRP threshold based at least in part on the second RSRP threshold or the fourth RSRP threshold being satisfied. The second RSRP threshold or the fourth RSRP threshold may be assumed to be satisfied (e.g., always assumed to be satisfied) . The second RSRP threshold or the fourth RSRP threshold may be assumed to not be satisfied (e.g., always assumed to not be satisfied) . The second RSRP threshold or the fourth RSRP threshold may or may not be satisfied may be based at least in part on a random determination by the UE.
[0111] In some aspects, the uplink carrier or the SUL carrier may be selected prior to the first set of downlink reference signals or the second set of downlink reference signals being selected. In some aspects, the uplink carrier may be selected based at least in part on a measured quality of a downlink associated with the first set of downlink reference signals satisfying a first signal power threshold of the plurality of signal power thresholds and a measured quality of a downlink associated with the second set of downlink reference signals satisfying a second signal power threshold of the plurality of signal power thresholds. In some aspects, the first set of downlink reference signals or the second set of downlink reference signals may be selected based at least in part on signal power thresholds corresponding to a selected uplink carrier or a selected SUL carrier.
[0112] In some aspects, the UE may first select an uplink carrier (e.g., uplink carrier or SUL carrier) for a serving cell, in accordance with a first step. When the UE is configured with PRACH resources associated with different sets of downlink reference signals on a selected UL carrier (e.g., both downlink TRP and uplink TRP have the selected uplink carrier) , the UE may further select a downlink reference signal from multiple sets of downlink reference signals (e.g., selection between downlink TRP and uplink TRP) , in accordance with a second step.
[0113] In some aspects, for the first step, when a measured quality of a downlink associated with the first set of downlink reference signals is no less than the first RSRP threshold, and when a measured quality of a downlink associated with the second set of downlink reference signals is no less than the second RSRP threshold, the UE may select an uplink carrier for performing a random access procedure. Otherwise, when at least one of a measured quality of a downlink associated with a set of downlink reference signals is less than a corresponding RSRP threshold, the UE may select an SUL carrier for performing the random access procedure.
[0114] In some aspects, for the second step, the UE may select a downlink reference signal from multiple sets of downlink reference signals based at least in part on one or more RSRP thresholds associated with one or more sets of downlink reference signals. In this case, the one or more RSRP thresholds associated with the one or more sets of downlink reference signals may be separately configured for uplink and SUL. The UE may apply the one or more RSRP thresholds corresponding to the selected uplink carrier.
[0115] In some aspects, the SUL carrier may be selected based at least in part on the measured quality of the downlink associated with the first set of downlink reference signals not satisfying the first signal power threshold or the measured quality of a downlink associated with the second set of downlink reference signals not satisfying the second signal power threshold.
[0116] In some aspects, as part of the first step, when a measured quality of a downlink from a downlink TRP is greater than or equal to the first threshold and when a measured quality of a downlink from an uplink TRP is greater than or equal to the second threshold, the UE may select the uplink carrier for performing the random access procedure. When the measured quality of the downlink from the downlink TRP is less than the first threshold and when the measured quality of the downlink from the uplink TRP is greater than or equal to the second threshold, the UE may select the SUL carrier for performing the random access procedure. When the measured quality of the downlink from the downlink TRP is greater than or equal to the first threshold and when the measured quality of the downlink from the uplink TRP is less than the second threshold, the UE may select the SUL carrier for performing the random access procedure. When the measured quality of the downlink from the downlink TRP is less than the first threshold and when the measured quality of the downlink from the uplink TRP is less than the second threshold, the UE may select the SUL carrier for performing the random access procedure.
[0117] In some aspects, as part of the second step, when the uplink carrier is selected for performing the random access procedure, for the first case (e.g., both a downlink TRP and an uplink TRP have an SUL carrier and an uplink carrier) , a selection may be between the downlink TRP and the uplink TRP. For the second case (e.g., a downlink TRP has both an SUL carrier and an uplink carrier, and an uplink TRP has an SUL carrier) , a downlink TRP may be selected. For the third case (e.g., a downlink TRP has an uplink carrier, and an uplink TRP has both an SUL carrier and an uplink carrier) , a selection may be between a downlink TRP and an uplink TRP. For the fourth case (e.g., a downlink TRP has an uplink carrier and an uplink TRP has an SUL carrier) , a downlink TRP may be selected.
[0118] In some aspects, as part of the second step, when the SUL carrier is selected for performing the random access procedure, for the first case, a selection may be between a downlink TRP and an uplink TRP. For the second case, a selection may be between a downlink TRP and an uplink TRP. For the third case, an uplink TRP may be selected. For the fourth case, an uplink TRP may be selected.
[0119] In some aspects, the uplink TRP may be an uplink-only TRP and the second set of downlink reference signals may not be configured. The uplink carrier may be selected based at least in part on the measured quality of the downlink associated with the first set of downlink reference signals satisfying the first signal power threshold. In some aspects, the SUL carrier may be selected by default. In some aspects, the uplink carrier may be randomly selected based at least in part on the measured quality of the downlink associated with the first set of downlink reference signals satisfying the first signal power threshold and the measured quality of the downlink associated with the second set of downlink reference signals being assumed to satisfy the second signal power threshold.
[0120] In some aspects, to extend to an uplink-only TRP, when a measured quality of a downlink associated with the first set of downlink reference signals is no less than the first RSRP threshold, the UE may select an uplink carrier for performing the random access procedure. Otherwise, the UE may select an SUL carrier for performing the random access procedure. This example may be equivalent to an assumption that a quality of a downlink from an uplink TRP satisfies the second threshold (e.g., always satisfies the second RSRP threshold) . In some aspects, the UE may select an SUL carrier (e.g., always select an SUL carrier) for performing the random access procedure. This example may be equivalent to an assumption that a quality of a downlink from an uplink TRP is less than (e.g., always less than) the second RSRP threshold. In some aspects, when a measured quality of a downlink associated with the first set of downlink reference signals is no less than the first RSRP threshold, the UE may randomly select an uplink carrier between an uplink carrier and an SUL carrier for performing the random access procedure. Otherwise, the UE may select an SUL carrier for performing the random access procedure. This example may be equivalent to an assumption that whether a quality of a downlink from an uplink TRP satisfies the second RSRP threshold is randomly determined by the UE.
[0121] In some aspects, the uplink carrier or the SUL carrier may be selected prior to the first set of downlink reference signals or the second set of downlink reference signals being selected. In some aspects, the SUL carrier may be selected for the first set of downlink reference signals based at least in part on the downlink TRP having the uplink carrier and the SUL carrier and a measured quality of a downlink associated with the first set of downlink reference signals being less than a first signal power threshold of the plurality of signal power thresholds. In some aspects, the SUL carrier may be selected for the second set of downlink reference signals based at least in part on the uplink TRP having the uplink carrier and the SUL carrier and a measured quality of a downlink associated with the second set of downlink reference signals being less than a second signal power threshold of the plurality of signal power thresholds. In some aspects, the uplink carrier may be selected based at least in part on the downlink TRP or the uplink TRP having one uplink carrier. In some aspects, the first set of downlink reference signals or the second set of downlink reference signals may be selected based at least in part on signal power thresholds corresponding to a respective selected carrier and a respective set of downlink reference signals.
[0122] In some aspects, the UE may first select respective uplink carriers for a PRACH transmission associated with different sets of downlink reference signals based on the respective measured quality of a downlink, in accordance with a first step. The UE may then select a downlink reference signal from the multiple sets of downlink reference signals (e.g., selection between a downlink TRP and an uplink TRP) , in accordance with a second step.
[0123] In some aspects, as part of the first step, when a PRACH transmission associated with the first set of downlink reference signals is configured for both an uplink carrier and an SUL carrier (e.g., when a downlink TRP has both an uplink carrier and an SUL carrier) , and when a measured quality of a downlink associated with the first set of downlink reference signals is less than the first RSRP threshold, the UE may select an SUL carrier for the PRACH associated with the first set of downlink reference signals. Otherwise, the UE may select an uplink carrier for the PRACH transmission associated with the first set of downlink reference signals.
[0124] In some aspects, as part of the first step, when a PRACH transmission associated with the second set of downlink reference signals is configured for both an uplink carrier and an SUL carrier (e.g., when an uplink TRP has both an uplink carrier and an SUL carrier) , and when a measured quality of a downlink associated with the second set of downlink reference signals is less than the second RSRP threshold, the UE may select an SUL carrier for the PRACH transmission associated with the second set of downlink reference signals. Otherwise, the UE may select an uplink carrier for the PRACH transmission associated with the second set of downlink reference signals.
[0125] In some aspects, as part of the first step, when a PRACH transmission associated with a first / second set of downlink reference signals is configured with one uplink carrier (e.g., when a downlink TRP or an uplink TRP has only one uplink carrier) , the UE may use the uplink carrier for a random access associated with the corresponding set of downlink reference signals.
[0126] In some aspects, as part of the second step, the UE may select a downlink reference signal from multiple sets of downlink reference signals based at least in part on one or more RSRP thresholds associated with one or more sets of downlink reference signals. In this case, the one or more RSRP thresholds associated with the one or more sets of downlink reference signals may be separately configured for uplink and SUL. For a given set of downlink reference signals, the UE may apply an RSRP threshold corresponding to a selected uplink carrier of a given set of downlink reference signals.
[0127] In some aspects, as part of the first step, for the first case, and for a downlink TRP, the UE may select an uplink carrier based at least in part on a measured quality of a downlink from the downlink TRP being greater than or equal to the first threshold. For the first case and the downlink TRP, the UE may select an SUL carrier based at least in part on the measured quality of the downlink from the downlink TRP being less than the first threshold. For the first case and an uplink TRP, the UE may select an uplink carrier based at least in part on a measured quality of a downlink from the uplink TRP being greater than or equal to the second threshold. For the first case and the uplink TRP, the UE may select an SUL carrier based at least in part on the measured quality of the downlink from the uplink TRP being less than the second threshold.
[0128] In some aspects, as part of the first step, for the second case, and for a downlink TRP, the UE may select an uplink carrier based at least in part on a measured quality of a downlink from the downlink TRP being greater than or equal to the first threshold. For the second case and the downlink TRP, the UE may select an SUL carrier based at least in part on the measured quality of the downlink from the downlink TRP being less than the first threshold. For the second case and an uplink TRP, the UE may select an SUL carrier.
[0129] In some aspects, as part of the first step, for the third case, and for a downlink TRP, the UE may select an SUL carrier. For the third case and an uplink TRP, the UE may select an uplink carrier based at least in part on a measured quality of a downlink from the uplink TRP being greater than or equal to the second threshold. For the third case and the uplink TRP, the UE may select an SUL carrier based at least in part on a measured quality of a downlink from the uplink TRP being less than the second threshold.
[0130] In some aspects, as part of the first step, for the fourth case, and for a downlink TRP, the UE may select an uplink carrier. For the fourth case and an uplink TRP, the UE may select an SUL carrier.
[0131] In some aspects, the uplink TRP may be an uplink-only TRP and the second set of downlink reference signals may not be configured. In some aspects, the SUL carrier may be selected for the first set of downlink reference signals based at least in part on the downlink TRP having the uplink carrier and the SUL carrier, and the measured quality of the downlink associated with the first set of downlink reference signals being less than the first signal power threshold. In some aspects, the uplink TRP may be associated with the uplink carrier and the SUL carrier. The uplink carrier may be selected for the uplink TRP, the SUL carrier may be selected for the uplink TRP, or the uplink carrier or the SUL carrier may be randomly selected for the uplink TRP
[0132] In some aspects, to extend to an uplink-only TRP, in the first step, when a PRACH associated with the first set of downlink reference signals is configured for both an uplink carrier and an SUL carrier (e.g., when a downlink TRP has both an uplink carrier and an SUL carrier) , and when a measured quality of a downlink associated with a first set of DL RSs is less than the first RSRP threshold, the UE may select the SUL carrier for a PRACH transmission associated with the first set of DL RSs. Otherwise, the UE may select an uplink carrier for the PRACH transmission associated with the first set of downlink reference signals.
[0133] In some aspects, when a PRACH transmission associated with the second set of downlink reference signals is configured for both an uplink carrier and an SUL carrier (e.g., when an uplink TRP has both an uplink carrier and an SUL carrier) , the UE may use a first option, a second option, or a third option for uplink carrier selection. In the first option, the UE may select an uplink carrier for the PRACH transmission associated with the second set of downlink reference signals. In the second option, the UE may select an SUL carrier for the PRACH transmission associated with the second set of downlink reference signals. In third option, the UE may randomly select an uplink carrier or an SUL carrier for the PRACH transmission associated with the second set of downlink reference signals. In some aspects, when a PRACH transmission associated with the first / second set of downlink reference signals is configured with one uplink carrier (e.g., a downlink TRP or an uplink TRP has one uplink carrier) , the UE may use that uplink carrier for a random access associated with the corresponding set of downlink reference signals.
[0134] In some aspects, the first set of downlink reference signals or the second set of downlink reference signals may be selected prior to the uplink carrier or the SUL carrier being selected. In some aspects, the second set of downlink reference signals may be selected based at least in part on the downlink TRP having the uplink carrier and the SUL carrier, and a measured quality of a downlink may be less than a first signal power threshold and a third signal power threshold of the plurality of signal power thresholds. In some aspects, the second set of downlink reference signals may be selected based at least in part on the downlink TRP having one uplink carrier or one SUL carrier, and a measured quality of a downlink may be less than a configured signal power threshold associated with the one uplink carrier or the one SUL carrier.
[0135] In some aspects, the UE may first determine whether a PRACH transmission is based at least in part on the first set of downlink reference signals from a downlink TRP (e.g., whether a PRACH transmission is toward the downlink TRP) based at least in part on a first RSRP threshold in an uplink carrier and a third RSRP threshold in an SUL carrier, where both RSRP thresholds may be associated with a first set of downlink reference signals from the downlink TRP. When the downlink TRP has both the uplink carrier and the SUL carrier, both RSRP thresholds may be configured in a SIB1 or via RRC signaling. When a measured quality of a downlink for the first set of downlink reference signals is less than both RSRP thresholds, the UE may select a second set of downlink reference signals from an uplink TRP for random access. Otherwise, the UE may select the first set of downlink reference signals for random access. In some aspects, when the downlink TRP has one uplink / SUL carrier (e.g., only one uplink / SUL carrier) , the RSRP threshold on the uplink / SUL carrier may be configured in a SIB1 or via RRC signaling. When a measured quality of a downlink for the first set of downlink reference signals is less than a configured RSRP threshold on the UL / SUL carrier, the UE may select a second set of downlink reference signals from an uplink TRP for random access. Otherwise, the UE may select the first set of downlink reference signals for random access.
[0136] In some aspects, the SUL carrier may be selected based at least in part on a measured quality of a downlink associated with the first set of downlink reference signals being less than a third signal power threshold of the plurality of signal power thresholds when the first set of downlink signals is selected. In some aspects, the SUL carrier may be selected based at least in part on a measured quality of a downlink associated with the second set of downlink reference signals being less than a fourth signal power threshold of the plurality of signal power thresholds when the second set of downlink reference signals is selected.
[0137] In some aspects, the uplink TRP may be an uplink-only TRP and the first set of downlink reference signals may not be selected. In some aspects, the uplink carrier may be selected for the uplink TRP. In some aspects, the SUL carrier may be selected for uplink TRP. In some aspects, the uplink carrier or the SUL carrier may be selected for the uplink TRP based at least in part on a random UE selection.
[0138] In some aspects, after a set of downlink reference signals is selected, when a PRACH transmission associated with the selected set of downlink reference signals is configured in both an uplink carrier and an SUL carrier, the UE may further select between the uplink carrier and the SUL carrier based at least in part on an RSRP threshold for SUL selection. The RSRP threshold for SUL selection may be configured separately for different set of downlink reference signals, e.g., a third RSRP threshold associated with the first set of downlink reference signals, and a fourth RSRP threshold associated with the second set of downlink reference signals may be configured. When a PRACH transmission associated with the first set of downlink reference signals is selected, the UE may select the SUL carrier when a measured quality of a downlink associated with the first set of downlink reference signals is less than the third RSRP threshold. When a PRACH transmission associated with the second set of downlink reference signals is selected, for an uplink TRP with a limited downlink functionality, the UE may select an SUL carrier when a measured quality of a downlink associated with the second set of downlink reference signals is less than the fourth RSRP threshold. In some aspects, for an uplink-only TRP, the UE may select between an uplink carrier and an SUL carrier based at least in part on a first option, a second option, or a third option, In the first option, the UE may select the UL carrier for the uplink-only TRP. In the second option, the UE may select the SUL carrier for the uplink-only TRP. For the third option, the UE may randomly select the uplink carrier or the SUL carrier for the uplink-only TRP.
[0139] As shown by reference number 906, the UE may transmit, to the network node, signaling associated with a random access based at least in part on the uplink carrier or the SUL carrier, and based at least in part on the first set of downlink reference signals or the second set of downlink reference signals. The signaling associated with the random access may include an uplink transmission. The UE may transmit the signaling associated with the random access using the uplink carrier or the SUL carrier, where the uplink carrier or the SUL carrier may be selected based at least in part on whether the signal power of the set of downlink reference signals satisfies the signal power threshold, and in accordance with the priority order.
[0140] As indicated above, Fig. 9 is provided as an example. Other examples may differ from what is described with regard to Fig. 9.
[0141] Fig. 10 is a diagram illustrating an example process 1000 performed, for example, at a UE or an apparatus of a UE. Example process 1000 is an example where the apparatus or the UE (e.g., UE 120) performs operations associated with carrier selection for random access in presence of downlink TRPs and uplink TRPs.
[0142] As shown in Fig. 10, in some aspects, process 1000 may include receiving a configuration that indicates a plurality of signal power thresholds, wherein: a signal power threshold of the plurality of signal power thresholds is associated with a set of downlink reference signals, the set of downlink reference signals includes a first set of downlink reference signals associated with a downlink TRP or a second set of downlink reference signals associated with an uplink TRP, and the signal power threshold is associated with an uplink carrier or an SUL carrier (block 1010) . For example, the UE (e.g., using reception component 1102 or communication manager 1106, depicted in Fig. 11) may receive a configuration that indicates a plurality of signal power thresholds, wherein: a signal power threshold of the plurality of signal power thresholds is associated with a set of downlink reference signals, the set of downlink reference signals includes a first set of downlink reference signals associated with a downlink TRP or a second set of downlink reference signals associated with an uplink TRP, and the signal power threshold is associated with an uplink carrier or an SUL carrier, as described above.
[0143] As further shown in Fig. 10, in some aspects, process 1000 may include selecting one of the uplink carrier or the SUL carrier and one of the first set of downlink reference signals or the second set of downlink reference signals based at least in part on whether a signal power of a set of downlink reference signals satisfies the signal power threshold, and in accordance with a priority order (block 1020) . For example, the UE (e.g., using communication manager 1106, depicted in Fig. 11) may select one of the uplink carrier or the SUL carrier and one of the first set of downlink reference signals or the second set of downlink reference signals based at least in part on whether a signal power of a set of downlink reference signals satisfies the signal power threshold, and in accordance with a priority order, as described above.
[0144] As further shown in Fig. 10, in some aspects, process 1000 may include transmitting signaling associated with a random access based at least in part on the uplink carrier or the SUL carrier, and based at least in part on the first set of downlink reference signals or the second set of downlink reference signals (block 1030) . For example, the UE (e.g., using transmission component 1104 or communication manager 1106, depicted in Fig. 11) may transmit signaling associated with a random access based at least in part on the uplink carrier or the SUL carrier, and based at least in part on the first set of downlink reference signals or the second set of downlink reference signals, as described above.
[0145] Process 1000 may include additional aspects, such as any single aspect or any combination of aspects described below or in connection with one or more other processes described elsewhere herein.
[0146] In a first aspect, the configuration is received via a SIB or RRC signaling.
[0147] In a second aspect, alone or in combination with the first aspect, the priority order is indicated via a SIB.
[0148] In a third aspect, alone or in combination with one or more of the first and second aspects, the plurality of signal power thresholds includes, for an uplink TRP with a limited downlink functionality, a first signal power threshold, a second signal power threshold, a third signal power threshold, and a fourth signal power threshold, wherein the first signal power threshold is configured for the uplink carrier and is associated with a measured quality of a downlink associated with the first set of downlink reference signals, wherein the second signal power threshold is configured for the uplink carrier and is associated with a measured quality of a downlink associated with the second set of downlink reference signals, wherein the third signal power threshold is configured for the SUL carrier and is associated with the measured quality of the downlink associated with the first set of downlink reference signals, and the fourth signal power threshold is configured for the SUL carrier and is associated with the measured quality of the downlink associated with the second set of downlink reference signals.
[0149] In a fourth aspect, alone or in combination with one or more of the first through third aspects, the third signal power threshold and the fourth signal power threshold of the plurality of signal power thresholds are configured in respective PRACH configurations, or the third signal power threshold and the fourth signal power threshold of the plurality of signal power thresholds are configured via a single PRACH configuration
[0150] In a fifth aspect, alone or in combination with one or more of the first through fourth aspects, the plurality of signal power thresholds includes, for an uplink-only TRP, a first signal power threshold and a third signal power threshold, wherein the first signal power threshold is configured for the uplink carrier and is associated with a measured quality of a downlink associated with the first set of downlink reference signals, and the third signal power threshold is configured for the SUL carrier and is associated with a measured quality of a downlink associated with the first set of downlink reference signals.
[0151] In a sixth aspect, alone or in combination with one or more of the first through fifth aspects, the uplink carrier or the SUL carrier, and the first set of downlink reference signals associated with the downlink TRP or the second set of downlink reference signals associated with the uplink TRP, are selected in accordance with joint selection criteria, the uplink carrier or the SUL carrier is selected prior to the first set of downlink reference signals associated with the downlink TRP or the second set of downlink reference signals associated with the uplink TRP being selected, or the first set of downlink reference signals associated with the downlink TRP or the second set of downlink reference signals associated with the uplink TRP are selected prior to the uplink carrier or the SUL carrier being selected.
[0152] In a seventh aspect, alone or in combination with one or more of the first through sixth aspects, process 1000 includes checking whether the signal power of the set of downlink reference signals satisfies the signal power threshold in accordance with the priority order, wherein the priority order defines an ordering of an uplink carrier of the downlink TRP, an uplink carrier of the uplink TRP, an SUL carrier of the downlink TRP, and an SUL carrier of the uplink TRP.
[0153] In an eighth aspect, alone or in combination with one or more of the first through seventh aspects, the uplink carrier and the first set of downlink reference signals are selected for random access based at least in part on a measured quality of a downlink associated with the first set of downlink reference signals satisfying a first signal power threshold of the plurality of signal power thresholds, the uplink carrier and the second set of downlink reference signals are selected for random access based at least in part on a measured quality of a downlink associated with the second set of downlink reference signals satisfying a second signal power threshold of the plurality of signal power thresholds, the SUL carrier and the first set of downlink reference signals are selected for random access based at least in part on the measured quality of the downlink associated with the first set of downlink reference signals satisfying a third signal power threshold of the plurality of signal power thresholds, or the SUL carrier and the second set of downlink reference signals are selected for random access based at least in part on the measured quality of the downlink associated with the second set of downlink reference signals satisfying a fourth signal power threshold of the plurality of signal power thresholds.
[0154] In a ninth aspect, alone or in combination with one or more of the first through eighth aspects, the uplink TRP is an uplink-only TRP and the second set of downlink reference signals is not configured, and the second signal power threshold or the fourth signal power threshold is assumed to be satisfied, the second signal power threshold or the fourth signal power threshold is assumed not to be satisfied, or whether the second signal power threshold or the fourth signal power threshold is assumed to be satisfied is based at least in part on a random determination at the UE.
[0155] In a tenth aspect, alone or in combination with one or more of the first through ninth aspects, the uplink carrier or the SUL carrier is selected prior to the first set of downlink reference signals or the second set of downlink reference signals being selected, the uplink carrier is selected based at least in part on a measured quality of a downlink associated with the first set of downlink reference signals satisfying a first signal power threshold of the plurality of signal power thresholds and a measured quality of a downlink associated with the second set of downlink reference signals satisfying a second signal power threshold of the plurality of signal power thresholds, and the first set of downlink reference signals or the second set of downlink reference signals is selected based at least in part on signal power thresholds corresponding to a selected uplink carrier or a selected SUL carrier.
[0156] In an eleventh aspect, alone or in combination with one or more of the first through tenth aspects, the SUL carrier is selected based at least in part on the measured quality of the downlink associated with the first set of downlink reference signals not satisfying the first signal power threshold or the measured quality of a downlink associated with the second set of downlink reference signals not satisfying the second signal power threshold.
[0157] In a twelfth aspect, alone or in combination with one or more of the first through eleventh aspects, the uplink TRP is an uplink-only TRP and the second set of downlink reference signals is not configured, and the uplink carrier is selected based at least in part on the measured quality of the downlink associated with the first set of downlink reference signals satisfying the first signal power threshold, the SUL carrier is selected by default, or the uplink carrier is randomly selected based at least in part on the measured quality of the downlink associated with the first set of downlink reference signals satisfying the first signal power threshold and the measured quality of the downlink associated with the second set of downlink reference signals being assumed to satisfy the second signal power threshold.
[0158] In a thirteenth aspect, alone or in combination with one or more of the first through twelfth aspects, the uplink carrier or the SUL carrier is selected prior to the first set of downlink reference signals or the second set of downlink reference signals being selected, the SUL carrier is selected for the first set of downlink reference signals based at least in part on the downlink TRP having the uplink carrier and the SUL carrier and a measured quality of a downlink associated with the first set of downlink reference signals being less than a first signal power threshold of the plurality of signal power thresholds, or the SUL carrier is selected for the second set of downlink reference signals based at least in part on the uplink TRP having the uplink carrier and the SUL carrier and a measured quality of a downlink associated with the second set of downlink reference signals being less than a second signal power threshold of the plurality of signal power thresholds, or the uplink carrier is selected based at least in part on the downlink TRP or the uplink TRP having one uplink carrier, and the first set of downlink reference signals or the second set of downlink reference signals is selected based at least in part on signal power thresholds corresponding to a respective selected carrier and a respective set of downlink reference signals.
[0159] In a fourteenth aspect, alone or in combination with one or more of the first through thirteenth aspects, the uplink TRP is an uplink-only TRP and the second set of downlink reference signals is not configured, and the SUL carrier is selected for the first set of downlink reference signals based at least in part on the downlink TRP having the uplink carrier and the SUL carrier, and the measured quality of the downlink associated with the first set of downlink reference signals being less than the first signal power threshold, or the uplink TRP is associated with the uplink carrier and the SUL carrier, and the uplink carrier is selected for the uplink TRP, the SUL carrier is selected for the uplink TRP, or the uplink carrier or the SUL carrier is randomly selected for the uplink TRP.
[0160] In a fifteenth aspect, alone or in combination with one or more of the first through fourteenth aspects, the first set of downlink reference signals or the second set of downlink reference signals is selected prior to the uplink carrier or the SUL carrier being selected, and the second set of downlink reference signals is selected based at least in part on the downlink TRP having the uplink carrier and the SUL carrier, and a measured quality of a downlink is less than a first signal power threshold and a third signal power threshold of the plurality of signal power thresholds, or the second set of downlink reference signals is selected based at least in part on the downlink TRP having one uplink carrier or one SUL carrier, and a measured quality of a downlink is less than a configured signal power threshold associated with the one uplink carrier or the one SUL carrier.
[0161] In a sixteenth aspect, alone or in combination with one or more of the first through fifteenth aspects, the SUL carrier is selected based at least in part on a measured quality of a downlink associated with the first set of downlink reference signals being less than a third signal power threshold of the plurality of signal power thresholds when the first set of downlink signals is selected, or the SUL carrier is selected based at least in part on a measured quality of a downlink associated with the second set of downlink reference signals being less than a fourth signal power threshold of the plurality of signal power thresholds when the second set of downlink reference signals is selected.
[0162] In a seventeenth aspect, alone or in combination with one or more of the first through sixteenth aspects, the uplink TRP is an uplink-only TRP and the first set of downlink reference signals is not selected, and the uplink carrier is selected for the uplink TRP, the SUL carrier is selected for uplink TRP, or the uplink carrier or the SUL carrier is selected for the uplink TRP based at least in part on a random UE selection.
[0163] In an eighteenth aspect, alone or in combination with one or more of the first through seventeenth aspects, the downlink TRP is associated with an uplink coverage and an SUL coverage, and the uplink TRP is associated with an uplink coverage and an SUL coverage, the downlink TRP is associated with an uplink coverage and an SUL coverage, and the uplink TRP is associated with an SUL coverage, the downlink TRP is associated with an uplink coverage, and the uplink TRP is associated with an uplink coverage and an SUL coverage, or the downlink TRP is associated with an uplink coverage, and the uplink TRP is associated with an SUL coverage.
[0164] Although Fig. 10 shows example blocks of process 1000, in some aspects, process 1000 may include additional blocks, fewer blocks, different blocks, or differently arranged blocks than those depicted in Fig. 10. Additionally, or alternatively, two or more of the blocks of process 1000 may be performed in parallel.
[0165] Fig. 11 is a diagram of an example apparatus 1100 for wireless communication. The apparatus 1100 may be a UE, or a UE may include the apparatus 1100. In some aspects, the apparatus 1100 includes a reception component 1102, a transmission component 1104, or a communication manager 1106, which may be in communication with one another (for example, via one or more buses or one or more other components) . In some aspects, the communication manager 1106 is the communication manager 150 described in connection with Fig. 1. As shown, the apparatus 1100 may communicate with another apparatus 1108, such as a UE or a network node (such as a CU, a DU, an RU, or a base station) , using the reception component 1102 and the transmission component 1104. The communication manager 1106 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.
[0166] In some aspects, the apparatus 1100 may be configured to perform one or more operations described herein in connection with Fig. 9. Additionally, or alternatively, the apparatus 1100 may be configured to perform one or more processes described herein, such as process 1000 of Fig. 10. In some aspects, the apparatus 1100 or one or more components shown in Fig. 11 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. 11 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.
[0167] The reception component 1102 may receive communications, such as reference signals, control information, data communications, or a combination thereof, from the apparatus 1108. The reception component 1102 may provide received communications to one or more other components of the apparatus 1100. In some aspects, the reception component 1102 may perform signal processing on the received communications, and may provide the processed signals to the one or more other components of the apparatus 1100. In some aspects, the reception component 1102 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.
[0168] The transmission component 1104 may transmit communications, such as reference signals, control information, data communications, or a combination thereof, to the apparatus 1108. In some aspects, one or more other components of the apparatus 1100 may generate communications and may provide the generated communications to the transmission component 1104 for transmission to the apparatus 1108. In some aspects, the transmission component 1104 may perform signal processing on the generated communications, and may transmit the processed signals to the apparatus 1108. In some aspects, the transmission component 1104 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 1104 may be co-located with the reception component 1102.
[0169] The communication manager 1106 may support operations of the reception component 1102 or the transmission component 1104. For example, the communication manager 1106 may receive information associated with configuring reception of communications by the reception component 1102 or transmission of communications by the transmission component 1104. Additionally, or alternatively, the communication manager 1106 may generate or provide control information to the reception component 1102 or the transmission component 1104 to control reception or transmission of communications.
[0170] The reception component 1102 may receive a configuration that indicates a plurality of signal power thresholds, wherein a signal power threshold of the plurality of signal power thresholds is associated with a set of downlink reference signals, the set of downlink reference signals includes a first set of downlink reference signals associated with a downlink TRP or a second set of downlink reference signals associated with an uplink TRP, and the signal power threshold is associated with an uplink carrier or an SUL carrier. The communication manager 1106 may select one of the uplink carrier or the SUL carrier and one of the first set of downlink reference signals or the second set of downlink reference signals based at least in part on whether a signal power of a set of downlink reference signals satisfies the signal power threshold, and in accordance with a priority order. The transmission component 1104 may transmit signaling associated with a random access based at least in part on the uplink carrier or the SUL carrier, and based at least in part on the first set of downlink reference signals or the second set of downlink reference signals.
[0171] The communication manager 1106 may check whether the signal power of the set of downlink reference signals satisfies the signal power threshold in accordance with the priority order, wherein the priority order defines an ordering of an uplink carrier of the downlink TRP, an uplink carrier of the uplink TRP, an SUL carrier of the downlink TRP, and an SUL carrier of the uplink TRP.
[0172] The number and arrangement of components shown in Fig. 11 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. 11. Furthermore, two or more components shown in Fig. 11 may be implemented within a single component, or a single component shown in Fig. 11 may be implemented as multiple, distributed components. Additionally, or alternatively, a set of (one or more) components shown in Fig. 11 may perform one or more functions described as being performed by another set of components shown in Fig. 11.
[0173] The following provides an overview of some Aspects of the present disclosure:
[0174] Aspect 1: A method of wireless communication performed by a user equipment (UE) , comprising: receiving a configuration that indicates a plurality of signal power thresholds, wherein: a signal power threshold of the plurality of signal power thresholds is associated with a set of downlink reference signals, the set of downlink reference signals includes a first set of downlink reference signals associated with a downlink transmit-receive point (TRP) or a second set of downlink reference signals associated with an uplink TRP, and the signal power threshold is associated with an uplink carrier or a supplementary uplink (SUL) carrier; and selecting one of the uplink carrier or the SUL carrier and one of the first set of downlink reference signals or the second set of downlink reference signals based at least in part on whether a signal power of a set of downlink reference signals satisfies the signal power threshold, and in accordance with a priority order; and transmitting signaling associated with a random access based at least in part on the uplink carrier or the SUL carrier, and based at least in part on the first set of downlink reference signals or the second set of downlink reference signals.
[0175] Aspect 2: The method of Aspect 1, wherein the configuration is received via a system information block (SIB) or radio resource control (RRC) signaling.
[0176] Aspect 3: The method of any of Aspects 1-2, wherein the priority order is indicated via a system information block (SIB) .
[0177] Aspect 4: The method of any of Aspects 1-3, wherein the plurality of signal power thresholds includes, for an uplink transmit-receive point (TRP) with a limited downlink functionality, a first signal power threshold, a second signal power threshold, a third signal power threshold, and a fourth signal power threshold, wherein the first signal power threshold is configured for the uplink carrier and is associated with a measured quality of a downlink associated with the first set of downlink reference signals, wherein the second signal power threshold is configured for the uplink carrier and is associated with a measured quality of a downlink associated with the second set of downlink reference signals, wherein the third signal power threshold is configured for the SUL carrier and is associated with the measured quality of the downlink associated with the first set of downlink reference signals, and wherein the fourth signal power threshold is configured for the SUL carrier and is associated with the measured quality of the downlink associated with the second set of downlink reference signals.
[0178] Aspect 5: The method of Aspect 4, wherein the third signal power threshold and the fourth signal power threshold of the plurality of signal power thresholds are configured in respective physical random access channel (PRACH) configurations, or the third signal power threshold and the fourth signal power threshold of the plurality of signal power thresholds are configured via a single PRACH configuration
[0179] Aspect 6: The method of any of Aspects 1-5, wherein the plurality of signal power thresholds includes, for an uplink-only transmit-receive point (TRP) , a first signal power threshold and a third signal power threshold, wherein the first signal power threshold is configured for the uplink carrier and is associated with a measured quality of a downlink associated with the first set of downlink reference signals, and wherein the third signal power threshold is configured for the SUL carrier and is associated with a measured quality of a downlink associated with the first set of downlink reference signals.
[0180] Aspect 7: The method of any of Aspects 1-6, wherein: the uplink carrier or the SUL carrier, and the first set of downlink reference signals associated with the downlink TRP or the second set of downlink reference signals associated with the uplink TRP, are selected in accordance with joint selection criteria; the uplink carrier or the SUL carrier is selected prior to the first set of downlink reference signals associated with the downlink TRP or the second set of downlink reference signals associated with the uplink TRP being selected; or the first set of downlink reference signals associated with the downlink TRP or the second set of downlink reference signals associated with the uplink TRP are selected prior to the uplink carrier or the SUL carrier being selected.
[0181] Aspect 8: The method of any of Aspects 1-7, further comprising: checking whether the signal power of the set of downlink reference signals satisfies the signal power threshold in accordance with the priority order, wherein the priority order defines an ordering of an uplink carrier of the downlink TRP, an uplink carrier of the uplink TRP, an SUL carrier of the downlink TRP, and an SUL carrier of the uplink TRP.
[0182] Aspect 9: The method of Aspect 8, wherein: the uplink carrier and the first set of downlink reference signals are selected for random access based at least in part on a measured quality of a downlink associated with the first set of downlink reference signals satisfying a first signal power threshold of the plurality of signal power thresholds; the uplink carrier and the second set of downlink reference signals are selected for random access based at least in part on a measured quality of a downlink associated with the second set of downlink reference signals satisfying a second signal power threshold of the plurality of signal power thresholds; the SUL carrier and the first set of downlink reference signals are selected for random access based at least in part on the measured quality of the downlink associated with the first set of downlink reference signals satisfying a third signal power threshold of the plurality of signal power thresholds; or the SUL carrier and the second set of downlink reference signals are selected for random access based at least in part on the measured quality of the downlink associated with the second set of downlink reference signals satisfying a fourth signal power threshold of the plurality of signal power thresholds.
[0183] Aspect 10: The method of Aspect 9, wherein the uplink TRP is an uplink-only TRP and the second set of downlink reference signals is not configured, and wherein the second signal power threshold or the fourth signal power threshold is assumed to be satisfied, the second signal power threshold or the fourth signal power threshold is assumed not to be satisfied, or whether the second signal power threshold or the fourth signal power threshold is assumed to be satisfied is based at least in part on a random determination at the UE.
[0184] Aspect 11: The method of any of Aspects 1-10, wherein: the uplink carrier or the SUL carrier is selected prior to the first set of downlink reference signals or the second set of downlink reference signals being selected; the uplink carrier is selected based at least in part on a measured quality of a downlink associated with the first set of downlink reference signals satisfying a first signal power threshold of the plurality of signal power thresholds and a measured quality of a downlink associated with the second set of downlink reference signals satisfying a second signal power threshold of the plurality of signal power thresholds; and the first set of downlink reference signals or the second set of downlink reference signals is selected based at least in part on signal power thresholds corresponding to a selected uplink carrier or a selected SUL carrier.
[0185] Aspect 12: The method of Aspect 11, wherein: the SUL carrier is selected based at least in part on the measured quality of the downlink associated with the first set of downlink reference signals not satisfying the first signal power threshold or the measured quality of a downlink associated with the second set of downlink reference signals not satisfying the second signal power threshold.
[0186] Aspect 13: The method of Aspect 11, wherein the uplink TRP is an uplink-only TRP and the second set of downlink reference signals is not configured, and wherein: the uplink carrier is selected based at least in part on the measured quality of the downlink associated with the first set of downlink reference signals satisfying the first signal power threshold; the SUL carrier is selected by default; or the uplink carrier is randomly selected based at least in part on the measured quality of the downlink associated with the first set of downlink reference signals satisfying the first signal power threshold and the measured quality of the downlink associated with the second set of downlink reference signals being assumed to satisfy the second signal power threshold.
[0187] Aspect 14: The method of any of Aspects 1-13, wherein: the uplink carrier or the SUL carrier is selected prior to the first set of downlink reference signals or the second set of downlink reference signals being selected; the SUL carrier is selected for the first set of downlink reference signals based at least in part on the downlink TRP having the uplink carrier and the SUL carrier and a measured quality of a downlink associated with the first set of downlink reference signals being less than a first signal power threshold of the plurality of signal power thresholds, or the SUL carrier is selected for the second set of downlink reference signals based at least in part on the uplink TRP having the uplink carrier and the SUL carrier and a measured quality of a downlink associated with the second set of downlink reference signals being less than a second signal power threshold of the plurality of signal power thresholds, or the uplink carrier is selected based at least in part on the downlink TRP or the uplink TRP having one uplink carrier; and the first set of downlink reference signals or the second set of downlink reference signals is selected based at least in part on signal power thresholds corresponding to a respective selected carrier and a respective set of downlink reference signals.
[0188] Aspect 15: The method of Aspect 14, wherein the uplink TRP is an uplink-only TRP and the second set of downlink reference signals is not configured, and wherein: the SUL carrier is selected for the first set of downlink reference signals based at least in part on the downlink TRP having the uplink carrier and the SUL carrier, and the measured quality of the downlink associated with the first set of downlink reference signals being less than the first signal power threshold; or the uplink TRP is associated with the uplink carrier and the SUL carrier, and the uplink carrier is selected for the uplink TRP, the SUL carrier is selected for the uplink TRP, or the uplink carrier or the SUL carrier is randomly selected for the uplink TRP.
[0189] Aspect 16: The method of any of Aspects 1-15, wherein: the first set of downlink reference signals or the second set of downlink reference signals is selected prior to the uplink carrier or the SUL carrier being selected; and the second set of downlink reference signals is selected based at least in part on the downlink TRP having the uplink carrier and the SUL carrier, and a measured quality of a downlink is less than a first signal power threshold and a third signal power threshold of the plurality of signal power thresholds, or the second set of downlink reference signals is selected based at least in part on the downlink TRP having one uplink carrier or one SUL carrier, and a measured quality of a downlink is less than a configured signal power threshold associated with the one uplink carrier or the one SUL carrier.
[0190] Aspect 17: The method of Aspect 16, wherein: the SUL carrier is selected based at least in part on a measured quality of a downlink associated with the first set of downlink reference signals being less than a third signal power threshold of the plurality of signal power thresholds when the first set of downlink signals is selected, or the SUL carrier is selected based at least in part on a measured quality of a downlink associated with the second set of downlink reference signals being less than a fourth signal power threshold of the plurality of signal power thresholds when the second set of downlink reference signals is selected.
[0191] Aspect 18: The method of Aspect 16, wherein the uplink TRP is an uplink-only TRP and the first set of downlink reference signals is not selected, and wherein: the uplink carrier is selected for the uplink TRP; the SUL carrier is selected for uplink TRP; or the uplink carrier or the SUL carrier is selected for the uplink TRP based at least in part on a random UE selection.
[0192] Aspect 19: The method of any of Aspects 1-18, wherein: the downlink TRP is associated with an uplink coverage and an SUL coverage, and the uplink TRP is associated with an uplink coverage and an SUL coverage; the downlink TRP is associated with an uplink coverage and an SUL coverage, and the uplink TRP is associated with an SUL coverage; the downlink TRP is associated with an uplink coverage, and the uplink TRP is associated with an uplink coverage and an SUL coverage; or the downlink TRP is associated with an uplink coverage, and the uplink TRP is associated with an SUL coverage.
[0193] Aspect 20: 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 1-19.
[0194] Aspect 21: 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 1-19.
[0195] Aspect 22: An apparatus for wireless communication, the apparatus comprising at least one means for performing the method of one or more of Aspects 1-19.
[0196] Aspect 23: 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 1-19.
[0197] Aspect 24: 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 1-19.
[0198] Aspect 25: 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 1-19.
[0199] Aspect 26: 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 1-19.
[0200] Aspect 27: A device comprising a processing system that includes one or more processors and one or more code-storing memories coupled with the one or more processors, the processing system configured to cause the device to perform the method of one or more of Aspects 1-19.
[0201] Aspect 28: A device comprising a processing system that includes processor circuitry and code-storing memory circuitry, the processing system configured to cause the device to perform the method of one or more of Aspects 1-19.
[0202] It will be apparent that systems or methods described herein may be implemented in different forms of hardware or a combination of hardware and software. A component being configured to perform a function means that the component has a capability to perform the function, and does not require the function to be actually performed by the component, unless noted otherwise.
[0203] As used herein, the term “determine” or “determining” can encompass one or more of a wide variety of actions. For example, “determining” can include one or more of calculating, computing, processing, deriving, detecting, estimating, investigating, looking up, inferring, ascertaining, measuring, resolving, selecting, choosing, obtaining, identifying, interpreting, demodulating, decoding, reading, establishing, forming or generating, among other examples. In some such examples, determining can involve a processor performing some type of calculating, computing, deriving, estimating, inferring, ascertaining, resolving, predicting or other processing to obtain one or more numerical values, sets, elements or other information or results. In some other such examples, determining can involve a processor identifying, looking up, investigating or otherwise obtaining some type of value, set, element or other information or result from a table, a data structure, a database or other memory device or location. In some other such examples, determining can involve a processor identifying, interpreting, demodulating, decoding, detecting, reading or otherwise obtaining some type of value, set, element or other information or result signaled in, for example, a received wireless packet. In some other such examples, determining can involve a processor selecting or choosing one or more values, sets, elements or other information or results from a larger set of values, sets elements or other information or results. In some other such examples, determining can involve a processor performing a measurement, such as on a received signal.
[0204] As used herein, the articles “a” and “an” are intended to refer to one or more items and may be used interchangeably with “one or more” or “at least one. ” As used herein, a phrase referring to “at least one of” or “one or more of” a list of items refers to any combination of those items, including single members. As an example, “at least one of: a, b, or c” is intended to cover: a, b, c, a-b, a-c, b-c, and a-b-c. Additionally, as used herein, a phrase referring to “a” or “an” element refers to one or more of such elements acting individually or collectively to perform the recited function (s) . Additionally, as used herein, a “set” can refer to one or more items, and a “subset” can refer to a whole set or less than the whole set, but not an empty set. “Set, ” “group, ” and similar terms are intended to include one or more items and may be used interchangeably with “one or more. ” Furthermore, as used herein, the term “or” is intended to be interpreted in the inclusive sense (such as when referring to a series) and may be used interchangeably with “and / or, ” unless otherwise explicitly indicated (for example, if used in conjunction with “either” or “only one of” ) . For example, “A or B” may include A only, B only, or a combination of A and B. Also, as used herein, the terms “has, ” “have, ” “having, ” “comprise, ” “comprising, ” “include” and “including, ” and derivatives thereof or similar terms are intended to be open-ended terms that do not limit an element that they modify (for example, an element “having” A also may have B) .
[0205] As used herein, the phrase “associated with” is intended to be interpreted in the inclusive sense, unless otherwise explicitly indicated. For example, the phrase “associated with” is not to be construed as a reference to a closed set of conditions, factors, criteria, elements, components, or actions, among other examples. Specifically, unless a phrase refers to “associated with only ‘a, ’ ” or the equivalent in context, whatever it is that is “associated with ‘a, ’ ” may be associated with “a” alone or associated with a combination of “a” and one or more other conditions, factors, criteria, elements, components, or actions, among other examples. In various examples, the phrase “associated with” may be interpreted to mean “in association with, ” “in accordance with, ” “based on, ” “based at least in part on, ” “as a function of, ” “in response to, ” “responsive to, ” or “using” as appropriate in the relevant context unless otherwise explicitly indicated. Furthermore, what follows the phrase “associated with, ” “in association with, ” “in accordance with, ” “based on, ” “based at least in part on, ” “as a function of, ” “in response to, ” “responsive to, ” or “using” is not necessarily the focal point or primary factor associated with the limitation preceding the phrase.
[0206] 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.
[0207] 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, configured to cause the UE to:receive a configuration that indicates a plurality of signal power thresholds, wherein:a signal power threshold of the plurality of signal power thresholds is associated with a set of downlink reference signals,the set of downlink reference signals includes a first set of downlink reference signals associated with a downlink transmit-receive point (TRP) or a second set of downlink reference signals associated with an uplink TRP, andthe signal power threshold is associated with an uplink carrier or a supplementary uplink (SUL) carrier; andselect one of the uplink carrier or the SUL carrier and one of the first set of downlink reference signals or the second set of downlink reference signals based at least in part on whether a signal power of a set of downlink reference signals satisfies the signal power threshold, and in accordance with a priority order; andtransmit signaling associated with a random access based at least in part on the uplink carrier or the SUL carrier, and based at least in part on the first set of downlink reference signals or the second set of downlink reference signals.2.The apparatus of claim 1, wherein the configuration is received via a system information block (SIB) or radio resource control (RRC) signaling, and wherein the priority order is indicated via the SIB.3.The apparatus of claim 1, wherein the plurality of signal power thresholds includes, for an uplink transmit-receive point (TRP) with a limited downlink functionality, a first signal power threshold, a second signal power threshold, a third signal power threshold, and a fourth signal power threshold, wherein the first signal power threshold is configured for the uplink carrier and is associated with a measured quality of a downlink associated with the first set of downlink reference signals, wherein the second signal power threshold is configured for the uplink carrier and is associated with a measured quality of a downlink associated with the second set of downlink reference signals, wherein the third signal power threshold is configured for the SUL carrier and is associated with the measured quality of the downlink associated with the first set of downlink reference signals, and wherein the fourth signal power threshold is configured for the SUL carrier and is associated with the measured quality of the downlink associated with the second set of downlink reference signals.4.The apparatus of claim 3, wherein the third signal power threshold and the fourth signal power threshold of the plurality of signal power thresholds are configured in respective physical random access channel (PRACH) configurations, or the third signal power threshold and the fourth signal power threshold of the plurality of signal power thresholds are configured via a single PRACH configuration.5.The apparatus of claim 1, wherein the plurality of signal power thresholds includes, for an uplink-only transmit-receive point (TRP) , a first signal power threshold and a third signal power threshold, wherein the first signal power threshold is configured for the uplink carrier and is associated with a measured quality of a downlink associated with the first set of downlink reference signals, and wherein the third signal power threshold is configured for the SUL carrier and is associated with a measured quality of a downlink associated with the first set of downlink reference signals.6.The apparatus of claim 1, wherein:the uplink carrier or the SUL carrier, and the first set of downlink reference signals associated with the downlink TRP or the second set of downlink reference signals associated with the uplink TRP, are selected in accordance with joint selection criteria;the uplink carrier or the SUL carrier is selected prior to the first set of downlink reference signals associated with the downlink TRP or the second set of downlink reference signals associated with the uplink TRP being selected; orthe first set of downlink reference signals associated with the downlink TRP or the second set of downlink reference signals associated with the uplink TRP are selected prior to the uplink carrier or the SUL carrier being selected.7.The apparatus of claim 1, wherein the one or more processors are further configured to cause the UE to:check whether the signal power of the set of downlink reference signals satisfies the signal power threshold in accordance with the priority order, wherein the priority order defines an ordering of an uplink carrier of the downlink TRP, an uplink carrier of the uplink TRP, an SUL carrier of the downlink TRP, and an SUL carrier of the uplink TRP.8.The apparatus of claim 7, wherein:the uplink carrier and the first set of downlink reference signals are selected for random access based at least in part on a measured quality of a downlink associated with the first set of downlink reference signals satisfying a first signal power threshold of the plurality of signal power thresholds;the uplink carrier and the second set of downlink reference signals are selected for random access based at least in part on a measured quality of a downlink associated with the second set of downlink reference signals satisfying a second signal power threshold of the plurality of signal power thresholds;the SUL carrier and the first set of downlink reference signals are selected for random access based at least in part on the measured quality of the downlink associated with the first set of downlink reference signals satisfying a third signal power threshold of the plurality of signal power thresholds; orthe SUL carrier and the second set of downlink reference signals are selected for random access based at least in part on the measured quality of the downlink associated with the second set of downlink reference signals satisfying a fourth signal power threshold of the plurality of signal power thresholds.9.The apparatus of claim 8, wherein the uplink TRP is an uplink-only TRP and the second set of downlink reference signals is not configured, and wherein the second signal power threshold or the fourth signal power threshold is assumed to be satisfied, the second signal power threshold or the fourth signal power threshold is assumed not to be satisfied, or whether the second signal power threshold or the fourth signal power threshold is assumed to be satisfied is based at least in part on a random determination at the UE.10.The apparatus of claim 1, wherein:the uplink carrier or the SUL carrier is selected prior to the first set of downlink reference signals or the second set of downlink reference signals being selected;the uplink carrier is selected based at least in part on a measured quality of a downlink associated with the first set of downlink reference signals satisfying a first signal power threshold of the plurality of signal power thresholds and a measured quality of a downlink associated with the second set of downlink reference signals satisfying a second signal power threshold of the plurality of signal power thresholds; andthe first set of downlink reference signals or the second set of downlink reference signals is selected based at least in part on signal power thresholds corresponding to a selected uplink carrier or a selected SUL carrier.11.The apparatus of claim 10, wherein:the SUL carrier is selected based at least in part on the measured quality of the downlink associated with the first set of downlink reference signals not satisfying the first signal power threshold or the measured quality of a downlink associated with the second set of downlink reference signals not satisfying the second signal power threshold.12.The apparatus of claim 10, wherein the uplink TRP is an uplink-only TRP and the second set of downlink reference signals is not configured, and wherein:the uplink carrier is selected based at least in part on the measured quality of the downlink associated with the first set of downlink reference signals satisfying the first signal power threshold;the SUL carrier is selected by default; orthe uplink carrier is randomly selected based at least in part on the measured quality of the downlink associated with the first set of downlink reference signals satisfying the first signal power threshold and the measured quality of the downlink associated with the second set of downlink reference signals being assumed to satisfy the second signal power threshold.13.The apparatus of claim 1, wherein:the uplink carrier or the SUL carrier is selected prior to the first set of downlink reference signals or the second set of downlink reference signals being selected;the SUL carrier is selected for the first set of downlink reference signals based at least in part on the downlink TRP having the uplink carrier and the SUL carrier and a measured quality of a downlink associated with the first set of downlink reference signals being less than a first signal power threshold of the plurality of signal power thresholds, or the SUL carrier is selected for the second set of downlink reference signals based at least in part on the uplink TRP having the uplink carrier and the SUL carrier and a measured quality of a downlink associated with the second set of downlink reference signals being less than a second signal power threshold of the plurality of signal power thresholds, or the uplink carrier is selected based at least in part on the downlink TRP or the uplink TRP having one uplink carrier; andthe first set of downlink reference signals or the second set of downlink reference signals is selected based at least in part on signal power thresholds corresponding to a respective selected carrier and a respective set of downlink reference signals.14.The apparatus of claim 13, wherein the uplink TRP is an uplink-only TRP and the second set of downlink reference signals is not configured, and wherein:the SUL carrier is selected for the first set of downlink reference signals based at least in part on the downlink TRP having the uplink carrier and the SUL carrier, and the measured quality of the downlink associated with the first set of downlink reference signals being less than the first signal power threshold; orthe uplink TRP is associated with the uplink carrier and the SUL carrier, and the uplink carrier is selected for the uplink TRP, the SUL carrier is selected for the uplink TRP, or the uplink carrier or the SUL carrier is randomly selected for the uplink TRP.15.The apparatus of claim 1, wherein:the first set of downlink reference signals or the second set of downlink reference signals is selected prior to the uplink carrier or the SUL carrier being selected; andthe second set of downlink reference signals is selected based at least in part on the downlink TRP having the uplink carrier and the SUL carrier, and a measured quality of a downlink is less than a first signal power threshold and a third signal power threshold of the plurality of signal power thresholds, or the second set of downlink reference signals is selected based at least in part on the downlink TRP having one uplink carrier or one SUL carrier, and a measured quality of a downlink is less than a configured signal power threshold associated with the one uplink carrier or the one SUL carrier.16.The apparatus of claim 15, wherein:the SUL carrier is selected based at least in part on a measured quality of a downlink associated with the first set of downlink reference signals being less than a third signal power threshold of the plurality of signal power thresholds when the first set of downlink reference signals is selected, or the SUL carrier is selected based at least in part on a measured quality of a downlink associated with the second set of downlink reference signals being less than a fourth signal power threshold of the plurality of signal power thresholds when the second set of downlink reference signals is selected.17.The apparatus of claim 15, wherein the uplink TRP is an uplink-only TRP and the first set of downlink reference signals is not selected, and wherein:the uplink carrier is selected for the uplink TRP;the SUL carrier is selected for the uplink TRP; orthe uplink carrier or the SUL carrier is selected for the uplink TRP based at least in part on a random UE selection.18.The apparatus of claim 1, wherein:the downlink TRP is associated with an uplink coverage and an SUL coverage, and the uplink TRP is associated with an uplink coverage and an SUL coverage;the downlink TRP is associated with an uplink coverage and an SUL coverage, and the uplink TRP is associated with an SUL coverage;the downlink TRP is associated with an uplink coverage, and the uplink TRP is associated with an uplink coverage and an SUL coverage; orthe downlink TRP is associated with an uplink coverage, and the uplink TRP is associated with an SUL coverage.19.A method of wireless communication performed by a user equipment (UE) , comprising:receiving a configuration that indicates a plurality of signal power thresholds, wherein:a signal power threshold of the plurality of signal power thresholds is associated with a set of downlink reference signals,the set of downlink reference signals includes a first set of downlink reference signals associated with a downlink transmit-receive point (TRP) or a second set of downlink reference signals associated with an uplink TRP, and the signal power threshold is associated with an uplink carrier or a supplementary uplink (SUL) carrier; andselecting one of the uplink carrier or the SUL carrier and one of the first set of downlink reference signals or the second set of downlink reference signals based at least in part on whether a signal power of a set of downlink reference signals satisfies the signal power threshold, and in accordance with a priority order; andtransmitting signaling associated with a random access based at least in part on the uplink carrier or the SUL carrier, and based at least in part on the first set of downlink reference signals or the second set of downlink reference signals.20.A non-transitory computer-readable medium storing a set of instructions for wireless communication, the set of instructions comprising:one or more instructions that, when executed by one or more processors of a user equipment (UE) , cause the UE to:receive a configuration that indicates a plurality of signal power thresholds, wherein:a signal power threshold of the plurality of signal power thresholds is associated with a set of downlink reference signals,the set of downlink reference signals includes a first set of downlink reference signals associated with a downlink transmit-receive point (TRP) or a second set of downlink reference signals associated with an uplink TRP, andthe signal power threshold is associated with an uplink carrier or a supplementary uplink (SUL) carrier; andselect one of the uplink carrier or the SUL carrier and one of the first set of downlink reference signals or the second set of downlink reference signals based at least in part on whether a signal power of a set of downlink reference signals satisfies the signal power threshold, and in accordance with a priority order; andtransmit signaling associated with a random access based at least in part on the uplink carrier or the SUL carrier, and based at least in part on the first set of downlink reference signals or the second set of downlink reference signals.