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WO2025222361A1 - Sélection d'un état d'indication de configuration de transmission pour une transmission de canal physique d'accès aléatoire - Google Patents

Sélection d'un état d'indication de configuration de transmission pour une transmission de canal physique d'accès aléatoire

Info

Publication number
WO2025222361A1
WO2025222361A1 PCT/CN2024/089242 CN2024089242W WO2025222361A1 WO 2025222361 A1 WO2025222361 A1 WO 2025222361A1 CN 2024089242 W CN2024089242 W CN 2024089242W WO 2025222361 A1 WO2025222361 A1 WO 2025222361A1
Authority
WO
WIPO (PCT)
Prior art keywords
tci
codepoint
tci state
select
processors
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
PCT/CN2024/089242
Other languages
English (en)
Inventor
Siyi Chen
Shaozhen GUO
Mostafa KHOSHNEVISAN
Xiaoxia Zhang
Changlong Xu
Luanxia YANG
Hao Xu
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Qualcomm Inc
Original Assignee
Qualcomm Inc
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Qualcomm Inc filed Critical Qualcomm Inc
Priority to PCT/CN2024/089242 priority Critical patent/WO2025222361A1/fr
Publication of WO2025222361A1 publication Critical patent/WO2025222361A1/fr
Pending legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W74/00—Wireless channel access
    • H04W74/002—Transmission of channel access control information
    • H04W74/006—Transmission of channel access control information in the downlink, i.e. towards the terminal
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
    • H04B7/0686—Hybrid systems, i.e. switching and simultaneous transmission
    • H04B7/0695—Hybrid systems, i.e. switching and simultaneous transmission using beam selection
    • H04B7/06952—Selecting one or more beams from a plurality of beams, e.g. beam training, management or sweeping
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/20—Control channels or signalling for resource management
    • H04W72/23—Control channels or signalling for resource management in the downlink direction of a wireless link, i.e. towards a terminal
    • H04W72/232—Control channels or signalling for resource management in the downlink direction of a wireless link, i.e. towards a terminal the control data signalling from the physical layer, e.g. DCI signalling

Definitions

  • aspects of the present disclosure generally relate to wireless communication and specifically relate to techniques, apparatuses, and methods for selecting a transmission configuration indication (TCI) for a physical random access channel (PRACH) transmission.
  • TCI transmission configuration indication
  • PRACH physical random access channel
  • Wireless communication systems are widely deployed to provide various services that may include carrying voice, text, messaging, video, data, and/or other traffic.
  • the services may include unicast, multicast, and/or broadcast services, among other examples.
  • Typical wireless communication systems may employ multiple-access radio access technologies (RATs) capable of supporting communication with multiple users by sharing available system resources (for example, time domain resources, frequency domain resources, spatial domain resources, and/or device transmit power, among other examples) .
  • RATs radio access technologies
  • multiple-access RATs include code division multiple access (CDMA) systems, time division multiple access (TDMA) systems, frequency division multiple access (FDMA) systems, orthogonal frequency division multiple access (OFDMA) systems, single-carrier frequency division multiple access (SC-FDMA) systems, and time division synchronous code division multiple access (TD-SCDMA) systems.
  • CDMA code division multiple access
  • TDMA time division multiple access
  • FDMA frequency division multiple access
  • OFDMA orthogonal frequency division multiple access
  • SC-FDMA single-carrier frequency division multiple access
  • TD-SCDMA time division synchronous code division multiple access
  • NR New Radio
  • 5G New Radio
  • 3GPP Third Generation Partnership Project
  • NR may be designed to better support Internet of things (IoT) and reduced capability device deployments, industrial connectivity, millimeter wave (mmWave) expansion, licensed and unlicensed spectrum access, non-terrestrial network (NTN) deployment, sidelink and other device-to-device direct communication technologies (for example, cellular vehicle-to-everything (CV2X) communication) , massive multiple-input multiple-output (MIMO) , disaggregated network architectures and network topology expansions, multiple-subscriber implementations, high-precision positioning, and/or radio frequency (RF) sensing, among other examples.
  • IoT Internet of things
  • mmWave millimeter wave
  • NTN non-terrestrial network
  • CV2X massive multiple-input multiple-output
  • MIMO massive multiple-input multiple-output
  • disaggregated network architectures and network topology expansions multiple-subscriber implementations
  • RF radio frequency
  • an apparatus for wireless communication at a user equipment includes one or more memories; and one or more processors, coupled to the one or more memories, individually or collectively configured to cause the UE to: receive a transmission configuration indication (TCI) activation medium access control control element (MAC-CE) ; select a TCI codepoint based at least in part on the TCI activation MAC-CE; select a TCI state in the TCI codepoint; and transmit a physical downlink control channel (PDCCH) ordered physical random access channel (PRACH) transmission based at least in part on the TCI state.
  • TCI transmission configuration indication
  • MAC-CE medium access control control element
  • PDCCH physical downlink control channel
  • PRACH physical random access channel
  • a method of wireless communication performed by a UE includes receiving a TCI activation MAC-CE; selecting a TCI codepoint based at least in part on the TCI activation MAC-CE; selecting a TCI state in the TCI codepoint; and transmitting a PDCCH ordered PRACH transmission based at least in part on the TCI state.
  • 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 TCI activation MAC-CE; select a TCI codepoint based at least in part on the TCI activation MAC-CE; select a TCI state in the TCI codepoint; and transmit a PDCCH ordered PRACH transmission based at least in part on the TCI state.
  • an apparatus for wireless communication includes means for receiving a TCI activation MAC-CE; means for selecting a TCI codepoint based at least in part on the TCI activation MAC-CE; means for selecting a TCI state in the TCI codepoint; and means for transmitting a PDCCH ordered PRACH transmission based at least in part on the TCI state.
  • aspects of the present disclosure may generally be implemented by or as a method, apparatus, system, computer program product, non-transitory computer-readable medium, user equipment, base station, network node, network entity, wireless communication device, and/or processing system as substantially described with reference to, and as illustrated by, the specification and accompanying drawings.
  • Fig. 1 is a diagram illustrating an example of a wireless network, in accordance with the present disclosure.
  • Fig. 2 is a diagram illustrating an example of a network node in communication with a user equipment (UE) in a wireless network, in accordance with the present disclosure.
  • UE user equipment
  • Fig. 3 is a diagram illustrating an example disaggregated base station architecture, in accordance with the present disclosure.
  • Fig. 4 is a diagram illustrating an example of an uplink dense deployment, in accordance with the present disclosure.
  • Figs. 5-6 are diagrams illustrating examples associated with selecting a transmission configuration indication (TCI) for a physical random access channel (PRACH) transmission, in accordance with the present disclosure.
  • TCI transmission configuration indication
  • PRACH physical random access channel
  • Fig. 7 is a diagram illustrating an example process associated with selecting a TCI for a PRACH transmission, in accordance with the present disclosure.
  • Fig. 8 is a diagram of an example apparatus for wireless communication, in accordance with the present disclosure.
  • An uplink dense deployment may be used to improve a coverage and/or a capacity of an uplink direction.
  • the uplink dense deployment may be associated with an asymmetric downlink/uplink densification.
  • An uplink receive (Rx) point e.g., an uplink-only node
  • UE user equipment
  • Downlink signals and/or downlink channels transmitted from a network node 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 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 uplink Rx points do not transmit any downlink signal.
  • the uplink Rx points may receive an uplink signal and send the uplink signal to the network node with or without processing.
  • a downlink control information (e.g., a DCI associated with DCI format 1_0) scrambled by a cell radio network temporary identifier (C-RNTI) with corresponding frequency domain resource allocation (FDRA) fields set to all ones may be used for a random access procedure initiated by a PDCCH order (e.g., the PDCCH order may trigger a UE to initiate a PRACH transmission) .
  • the DCI format 1_0 for the PDCCH order may include various fields.
  • the DCI format 1_0 for the PDCCH order may include a random access preamble index field (6 bits) .
  • the DCI format 1_0 for the PDCCH order may include an uplink/SUL indicator field (1 bit) .
  • the DCI format 1_0 for the PDCCH order may include a synchronization signal (SS) or physical broadcast channel (PBCH) (SS/PBCH) index field (6 bits) .
  • the DCI format 1_0 for the PDCCH order may include a PRACH association indicator field (0 bits or 1 bit) .
  • a transmission configuration indicator (TCI) state may be indicated in a PDCCH order DCI for a PDCCH ordered PRACH transmission (e.g., a PRACH transmission that is in response to the PDCCH order) .
  • the TCI state may be a single TCI state in a TCI codepoint. However, one TCI codepoint may include multiple TCI states. In this case, the specific TCI state, of the multiple TCI states, that should be used for the PDCCH ordered PRACH may be ambiguous to a UE and/or a network node, thereby degrading an overall system performance.
  • a UE may receive, from a network node, a TCI activation MAC-CE.
  • the UE may be associated with a single transmission-reception point (TRP) or multiple TRPs.
  • the UE may be associated with an uplink dense environment in which an uplink TRP is different than a downlink TRP.
  • the TCI activation MAC-CE may include one or more TCI codepoints, where each TCI codepoint may include one or more TCI states.
  • the UE may select a TCI codepoint based at least in part on the TCI activation MAC-CE.
  • the UE may select the TCI codepoint based at least in part on a default rule and/or a beam indication DCI.
  • the UE may apply the default rule based at least in part on the beam indication DCI not being received by the UE, or the UE may apply the default rule before applying the TCI state, where the TCI state may be indicated from configured TCI states.
  • the UE may receive, from the network node, a PDCCH order DCI that includes an explicit indication, and the UE may select the TCI codepoint based at least in part on the explicit indication.
  • the UE may select a TCI state in the TCI codepoint.
  • the UE may select the TCI state based at least in part on a default rule.
  • the UE may receive, from the network node, a PDCCH order DCI that includes an explicit indication, and the UE may select the TCI state based at least in part on the explicit indication.
  • the UE may transmit, to the network node, a PDCCH ordered PRACH transmission based at least in part on the TCI state. In other words, the UE may transmit the PDCCH ordered PRACH transmission using the TCI state selected from the TCI codepoint.
  • the described techniques can be used by the UE to determine which TCI state in a TCI codepoint should be used for the PRACH transmission.
  • the TCI codepoint may include multiple TCI states, and the PRACH transmission may be the PDCCH ordered PRACH transmission.
  • the UE may select an appropriate TCI state as part of a TCI state determination for the PDCCH ordered PRACH transmission in a specific scenario of uplink dense deployment, in which no correlation exists between a downlink beam pair and an uplink beam pair.
  • the UE may be able to select the appropriate TCI state, from the multiple TCI states, for the PDCCH ordered PRACH transmission, which may improve an overall system performance.
  • 5G New Radio is part of a continuous mobile broadband evolution promulgated by the Third Generation Partnership Project (3GPP) .
  • 3GPP Third Generation Partnership Project
  • 5G NR supports various technologies and use cases including enhanced mobile broadband (eMBB) , ultra-reliable low-latency communication (URLLC) , massive machine-type communication (mMTC) , millimeter wave (mmWave) technology, beamforming, network slicing, edge computing, Internet of Things (IoT) connectivity and management, and network function virtualization (NFV) .
  • eMBB enhanced mobile broadband
  • URLLC ultra-reliable low-latency communication
  • mMTC massive machine-type communication
  • mmWave millimeter wave
  • beamforming network slicing
  • edge computing Internet of Things (IoT) connectivity and management
  • NFV network function virtualization
  • Such technological improvements may be associated with new frequency band expansion, licensed and unlicensed spectrum access, overlapping spectrum use, small cell deployments, non-terrestrial network (NTN) deployments, disaggregated network architectures and network topology expansion, device aggregation, advanced duplex communication, sidelink and other device-to-device direct communication, IoT (including passive or ambient IoT) networks, reduced capability (RedCap) UE functionality, industrial connectivity, multiple-subscriber implementations, high-precision positioning, radio frequency (RF) sensing, and/or artificial intelligence or machine learning (AI/ML) , among other examples.
  • NTN non-terrestrial network
  • disaggregated network architectures and network topology expansion device aggregation
  • advanced duplex communication including passive or ambient IoT
  • RedCap reduced capability
  • industrial connectivity multiple-subscriber implementations
  • high-precision positioning radio frequency (RF) sensing
  • AI/ML artificial intelligence or machine learning
  • These technological improvements may support use cases such as wireless backhauls, wireless data centers, extended reality (XR) and metaverse applications, meta services for supporting vehicle connectivity, holographic and mixed reality communication, autonomous and collaborative robots, vehicle platooning and cooperative maneuvering, sensing networks, gesture monitoring, human-brain interfacing, digital twin applications, asset management, and universal coverage applications using non-terrestrial and/or aerial platforms, among other examples.
  • use cases such as wireless backhauls, wireless data centers, extended reality (XR) and metaverse applications, meta services for supporting vehicle connectivity, holographic and mixed reality communication, autonomous and collaborative robots, vehicle platooning and cooperative maneuvering, sensing networks, gesture monitoring, human-brain interfacing, digital twin applications, asset management, and universal coverage applications using non-terrestrial and/or aerial platforms, among other examples.
  • XR extended reality
  • 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-bra
  • Fig. 1 is a diagram illustrating an example of a wireless communication network 100 in accordance with the present disclosure.
  • the wireless communication network 100 may be or may include elements of a 5G (or NR) network or a 6G network, among other examples.
  • the wireless communication network 100 may include multiple network nodes 110, shown as a network node (NN) 110a, a network node 110b, a network node 110c, and a network node 110d.
  • the network nodes 110 may support communications with multiple UEs 120, shown as a UE 120a, a UE 120b, a UE 120c, a UE 120d, and a UE 120e.
  • the network nodes 110 and the UEs 120 of the wireless communication network 100 may communicate using the electromagnetic spectrum, which may be subdivided by frequency or wavelength into various classes, bands, carriers, and/or channels. For example, devices of the wireless communication network 100 may communicate using one or more operating bands.
  • multiple wireless networks 100 may be deployed in a given geographic area.
  • Each wireless communication network 100 may support a particular RAT (which may also be referred to as an air interface) and may operate on one or more carrier frequencies in one or more frequency ranges.
  • RATs include a 4G RAT, a 5G/NR RAT, and/or a 6G RAT, among other examples.
  • each RAT in the geographic area may operate on different frequencies to avoid interference with one another.
  • FR1 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) .
  • FR1 is often referred to (interchangeably) as a “Sub-6 GHz” band in some documents and articles.
  • FR2 is often referred to (interchangeably) as a “millimeter wave” band in some documents and articles, despite being different than the extremely high frequency (EHF) band (30 GHz through 300 GHz) , which is identified by the International Telecommunications Union (ITU) as a “millimeter wave” band.
  • EHF extremely high frequency
  • ITU International Telecommunications Union
  • the frequencies between FR1 and FR2 are often referred to as mid-band frequencies, which include FR3.
  • Frequency bands falling within FR3 may inherit FR1 characteristics or FR2 characteristics, and thus may effectively extend features of FR1 or FR2 into mid-band frequencies.
  • sub-6 GHz may broadly refer to frequencies that are less than 6 GHz, that are within FR1, and/or that are included in mid-band frequencies.
  • millimeter wave if used herein, may broadly refer to frequencies that are included in mid-band frequencies, that are within FR2, FR4, FR4-aor FR4-1, or FR5, and/or that are within the EHF band.
  • Higher frequency bands may extend 5G NR operation, 6G operation, and/or other RATs beyond 52.6 GHz.
  • each of FR4a, FR4-1, FR4, and FR5 falls within the EHF band.
  • the wireless communication network 100 may implement dynamic spectrum sharing (DSS) , in which multiple RATs (for example, 4G/LTE and 5G/NR) are implemented with dynamic bandwidth allocation (for example, based on user demand) in a single frequency band.
  • DSS dynamic spectrum sharing
  • multiple RATs for example, 4G/LTE and 5G/NR
  • dynamic bandwidth allocation for example, based on user demand
  • a network node 110 may include one or more devices, components, or systems that enable communication between a UE 120 and one or more devices, components, or systems of the wireless communication network 100.
  • a network node 110 may be, may include, or may also be referred to as an NR network node, a 5G network node, a 6G network node, a Node B, an eNB, a gNB, an access point (AP) , a TRP, a mobility element, a core, a network entity, a network element, a network equipment, and/or another type of device, component, or system included in a radio access network (RAN) .
  • RAN radio access network
  • 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) .
  • a network node 110 may be a device or system that implements 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.
  • 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 node (for example, a single physical structure) in the wireless communication network 100.
  • an aggregated network node 110 may consist of a single standalone base station or a single TRP that uses a full radio protocol stack to enable or facilitate communication between a UE 120 and a core network of the wireless communication network 100.
  • a network node 110 may be a disaggregated network node (sometimes referred to as a disaggregated base station) , meaning that the network node 110 may implement a radio protocol stack that is physically distributed and/or logically distributed among two or more nodes in the same geographic location or in different geographic locations.
  • a disaggregated network node may have a disaggregated architecture.
  • 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 base station functionality into multiple units that can be individually deployed.
  • IAB integrated access and backhaul
  • O-RAN open radio access network
  • vRAN virtualized radio access network
  • C-RAN cloud radio access network
  • the network nodes 110 of the wireless communication network 100 may include one or more central units (CUs) , one or more distributed units (DUs) , and/or one or more radio units (RUs) .
  • a CU may host one or more higher layer control functions, such as radio resource control (RRC) functions, packet data convergence protocol (PDCP) functions, and/or service data adaptation protocol (SDAP) functions, among other examples.
  • RRC radio resource control
  • PDCP packet data convergence protocol
  • SDAP service data adaptation protocol
  • a DU may host one or more of a radio link control (RLC) layer, a medium access control (MAC) layer, and/or one or more higher physical (PHY) layers depending, at least in part, on a functional split, such as a functional split defined by the 3GPP.
  • RLC radio link control
  • MAC medium access control
  • PHY physical
  • a DU also may host one or more lower PHY layer functions, such as a fast Fourier transform (FFT) , an inverse FFT (iFFT) , beamforming, physical random access channel (PRACH) extraction and filtering, and/or scheduling of resources for one or more UEs 120, among other examples.
  • An RU may host 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 functional split.
  • each RU can be operated to handle over the air (OTA) communication with one or more UEs 120.
  • OTA over the air
  • a single network node 110 may include a combination of one or more CUs, one or more DUs, and/or one or more RUs. Additionally or alternatively, a network node 110 may include one or more Near-Real Time (Near-RT) RAN Intelligent Controllers (RICs) and/or one or more Non-Real Time (Non-RT) RICs.
  • a CU, a DU, and/or an RU may be implemented as a virtual unit, such as a virtual central unit (VCU) , a virtual distributed unit (VDU) , or a virtual radio unit (VRU) , among other examples.
  • a virtual unit may be implemented as a virtual network function, such as associated with a cloud deployment.
  • Some network nodes 110 may provide communication coverage for a particular geographic area.
  • the term “cell” can refer to a coverage area of a network node 110 or to a network node 110 itself, depending on the context in which the term is used.
  • a network node 110 may support one or multiple (for example, three) cells.
  • a network node 110 may provide communication coverage for a macro cell, a pico cell, a femto cell, or another type of cell.
  • a macro cell may cover a relatively large geographic area (for example, several kilometers in radius) and may allow unrestricted access by UEs 120 with service subscriptions.
  • a pico cell may cover a relatively small geographic area and may allow unrestricted access by UEs 120 with service subscriptions.
  • a femto cell may cover a relatively small geographic area (for example, a home) and may allow restricted access by UEs 120 having association with the femto cell (for example, UEs 120 in a closed subscriber group (CSG) ) .
  • a network node 110 for a macro cell may be referred to as a macro network node.
  • a network node 110 for a pico cell may be referred to as a pico network node.
  • a network node 110 for a femto cell may be referred to as a femto network node or an in-home network node.
  • a cell may not necessarily be stationary.
  • the geographic area of the cell may move according to the location of an associated mobile network node 110 (for example, a train, a satellite base station, an unmanned aerial vehicle, or an NTN network node) .
  • an associated mobile network node 110 for example, a train, a satellite base station, an unmanned aerial vehicle, or an NTN network node
  • the wireless communication network 100 may be a heterogeneous network that includes network nodes 110 of different types, such as macro network nodes, pico network nodes, femto network nodes, relay network nodes, aggregated network nodes, and/or disaggregated network nodes, among other examples.
  • the network node 110a may be a macro network node for a macro cell 130a
  • the network node 110b may be a pico network node for a pico cell 130b
  • the network node 110c may be a femto network node for a femto cell 130c.
  • network nodes 110 may generally transmit at different power levels, serve different coverage areas, and/or have different impacts on interference in the wireless communication network 100 than other types of network nodes 110.
  • macro network nodes may have a high transmit power level (for example, 5 to 40 watts)
  • pico network nodes, femto network nodes, and relay network nodes may have lower transmit power levels (for example, 0.1 to 2 watts) .
  • 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
  • uplink or “UL”
  • Downlink channels may include one or more control channels and one or more data channels.
  • a downlink control channel may be used to transmit DCI (for example, scheduling information, reference signals, and/or configuration information) from a network node 110 to a UE 120.
  • 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 one or more physical downlink control channels (PDCCHs)
  • downlink data channels may include one or more physical downlink shared channels (PDSCHs) .
  • Uplink channels may similarly include one or more control channels and one or more data channels.
  • An uplink control channel may be used to transmit uplink control information (UCI) (for example, reference signals and/or feedback corresponding to one or more downlink transmissions) from a UE 120 to a network node 110.
  • UCI uplink control information
  • 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 one or more physical uplink control channels (PUCCHs)
  • uplink data channels may include one or more physical uplink shared channels (PUSCHs) .
  • the downlink and the uplink may each include a set of resources on which the network node 110 and the UE 120 may communicate.
  • Downlink and uplink resources may include time domain resources (frames, subframes, slots, and/or symbols) , frequency domain resources (frequency bands, component carriers, subcarriers, resource blocks, and/or resource elements) , and/or spatial domain resources (particular transmit directions and/or beam parameters) .
  • Frequency domain resources of some bands may be subdivided into bandwidth parts (BWPs) .
  • a BWP may be a continuous block of frequency domain resources (for example, a continuous block of resource blocks) that are allocated for one or more UEs 120.
  • a UE 120 may be configured with both an uplink BWP and a downlink BWP (where the uplink BWP and the downlink BWP may be the same BWP or different BWPs) .
  • a BWP may be dynamically configured (for example, by a network node 110 transmitting a DCI configuration to the one or more UEs 120) and/or reconfigured, which means that a BWP can be adjusted in real-time (or near-real-time) based on changing network conditions in the wireless communication network 100 and/or based on the specific requirements of the one or more UEs 120.
  • This enables more efficient use of the available frequency domain resources in the wireless communication network 100 because fewer frequency domain resources may be allocated to a BWP for a UE 120 (which may reduce the quantity of frequency domain resources that a UE 120 is required to monitor) , leaving more frequency domain resources to be spread across multiple UEs 120.
  • BWPs may also assist in the implementation of lower-capability UEs 120 by facilitating the configuration of smaller bandwidths for communication by such UEs 120.
  • the wireless communication network 100 may be, may include, or may be included in, an IAB network.
  • at least one network node 110 is an anchor network node that communicates with a core network.
  • An anchor network node 110 may also be referred to as an IAB donor (or “IAB-donor” ) .
  • the anchor network node 110 may connect to the core network via a wired backhaul link.
  • an Ng interface of the anchor network node 110 may terminate at the core network.
  • an anchor network node 110 may connect to one or more devices of the core network that provide a core access and mobility management function (AMF) .
  • AMF core access and mobility management function
  • An IAB network also generally includes multiple non-anchor network nodes 110, which may also be referred to as relay network nodes or simply as IAB nodes (or “IAB-nodes” ) .
  • Each non-anchor network node 110 may communicate directly with the anchor network node 110 via a wireless backhaul link to access the core network, or may communicate indirectly with the anchor network node 110 via one or more other non-anchor network nodes 110 and associated wireless backhaul links that form a backhaul path to the core network.
  • Some anchor network node 110 or other non-anchor network node 110 may also communicate directly with one or more UEs 120 via wireless access links that carry access traffic.
  • network resources for wireless communication (such as time resources, frequency resources, and/or spatial resources) may be shared between access links and backhaul links.
  • any network node 110 that relays communications may be referred to as a relay network node, a relay station, or simply as a relay.
  • a relay may receive a transmission of a communication from an upstream station (for example, another network node 110 or a UE 120) and transmit the communication to a downstream station (for example, a UE 120 or another network node 110) .
  • the wireless communication network 100 may include or be referred to as a “multi-hop network. ” In the example shown in Fig.
  • the network node 110d may communicate with the network node 110a (for example, a macro network node) and the UE 120d in order to facilitate communication between the network node 110a and the UE 120d.
  • a UE 120 may be or may operate as a relay station that can relay transmissions to or from other UEs 120.
  • a UE 120 that relays communications may be referred to as a UE relay or a relay UE, among other examples.
  • the UEs 120 may be physically dispersed throughout the wireless communication network 100, and each UE 120 may be stationary or mobile.
  • a UE 120 may be, may include, or may be included in an access terminal, another terminal, a mobile station, or a subscriber unit.
  • a UE 120 may be, include, or be coupled with a cellular phone (for example, a smart phone) , a personal digital assistant (PDA) , a wireless modem, a wireless communication device, a handheld device, a laptop computer, a cordless phone, a wireless local loop (WLL) station, a tablet, a camera, a gaming device, 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, and/or smart jewelry, such as a smart ring or a smart bracelet) , an entertainment device (for example, a music device, a video device, and/or a satellite
  • a UE 120 and/or a network node 110 may include one or more chips, system-on-chips (SoCs) , chipsets, packages, or devices that individually or collectively constitute or comprise a processing system.
  • the processing system 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) and/or digital signal processors (DSPs) ) , processing blocks, application-specific integrated circuits (ASIC) , programmable logic devices (PLDs) (such as field programmable gate arrays (FPGAs) ) , or other discrete gate or transistor logic or circuitry (all of which may be generally referred to herein individually as “processors” or collectively as “the processor” or “the processor circuitry” ) .
  • processors or “processing” circuitry in the form of one or multiple processors, microprocessors
  • One or more of the 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, or may include the group of processors all being configured or configurable to perform the set of functions.
  • the processing system may further include memory circuitry in the form of one or more memory devices, memory blocks, memory elements or other discrete gate or transistor logic or circuitry, each of which may include tangible storage media such as random-access memory (RAM) or read-only memory (ROM) , or combinations thereof (all of which may be generally referred to herein individually as “memories” or collectively as “the memory” or “the memory circuitry” ) .
  • RAM random-access memory
  • ROM read-only memory
  • One or more of the memories may be coupled (for example, operatively coupled, communicatively coupled, electronically coupled, or electrically coupled) with one or more of the processors and may individually or collectively store processor-executable code (such as software) that, when executed by one or more of the processors, may configure one or more of the processors to perform various functions or operations described herein. Additionally or alternatively, in some examples, one or more of the processors may be preconfigured to perform various functions or operations described herein without requiring configuration by software.
  • the processing system may further include or be coupled with one or more modems (such as a Wi-Fi (for example, IEEE compliant) modem or a cellular (for example, 3GPP 4G LTE, 5G, or 6G compliant) modem) .
  • modems such as a Wi-Fi (for example, IEEE compliant) modem or a cellular (for example, 3GPP 4G LTE, 5G, or 6G compliant) modem
  • one or more processors of the processing system include or implement one or more of the modems.
  • the processing system may further 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.
  • one or more processors of the processing system include or implement one or more of the radios, RF chains or transceivers.
  • the UE 120 may include or may be included in a housing that houses components associated with the UE 120 including the processing system.
  • Some UEs 120 may be considered machine-type communication (MTC) UEs, evolved or enhanced machine-type communication (eMTC) , UEs, further enhanced eMTC (feMTC) UEs, or enhanced feMTC (efeMTC) UEs, or further evolutions thereof, all of which may be simply referred to as “MTC UEs” ) .
  • An MTC UE may be, may include, or may be included in or coupled with a robot, an uncrewed aerial vehicle, a remote device, a sensor, a meter, a monitor, and/or a location tag.
  • Some UEs 120 may be considered IoT devices and/or may be implemented as NB-IoT (narrowband IoT) devices.
  • An IoT UE or NB-IoT device may be, may include, or may be included in or coupled with an industrial machine, an appliance, a refrigerator, a doorbell camera device, a home automation device, and/or a light fixture, among other examples.
  • Some UEs 120 may be considered Customer Premises Equipment, which may include telecommunications devices that are installed at a customer location (such as a home or office) to enable access to a service provider's network (such as included in or in communication with the wireless communication network 100) .
  • Some UEs 120 may be classified according to different categories in association with different complexities and/or different capabilities.
  • UEs 120 in a first category may facilitate massive IoT in the wireless communication network 100, and may offer low complexity and/or cost relative to UEs 120 in a second category.
  • UEs 120 in a second category may include mission-critical IoT devices, legacy UEs, baseline UEs, high-tier UEs, advanced UEs, full-capability UEs, and/or premium UEs that are capable of URLLC, enhanced mobile broadband (eMBB) , and/or precise positioning in the wireless communication network 100, among other examples.
  • eMBB enhanced mobile broadband
  • a third category of UEs 120 may have mid-tier complexity and/or capability (for example, a capability between UEs 120 of the first category and UEs 120 of the second capability) .
  • a UE 120 of the third category may be referred to as a reduced capacity UE ( “RedCap UE” ) , a mid-tier UE, an NR-Light UE, and/or an NR-Lite UE, among other examples.
  • RedCap UEs may bridge a gap between the capability and complexity of NB-IoT devices and/or eMTC UEs, and mission-critical IoT devices and/or premium UEs.
  • RedCap UEs may include, for example, wearable devices, IoT devices, industrial sensors, and/or cameras that are associated with a limited bandwidth, power capacity, and/or transmission range, among other examples.
  • RedCap UEs may support healthcare environments, building automation, electrical distribution, process automation, transport and logistics, and/or smart city deployments, among other examples.
  • two or more UEs 120 may communicate directly with one another using sidelink communications (for example, without communicating by way of a network node 110 as an intermediary) .
  • the UE 120a may directly transmit data, control information, or other signaling as a sidelink communication to the UE 120e. This is in contrast to, for example, the UE 120a first transmitting data in an UL communication to a network node 110, which then transmits the data to the UE 120e in a DL communication.
  • the UEs 120 may transmit and receive sidelink communications using peer-to-peer (P2P) communication protocols, device-to-device (D2D) communication protocols, vehicle-to-everything (V2X) communication protocols (which may include vehicle-to-vehicle (V2V) protocols, vehicle-to-infrastructure (V2I) protocols, and/or vehicle-to-pedestrian (V2P) protocols) , and/or mesh network communication protocols.
  • a network node 110 may schedule and/or allocate resources for sidelink communications between UEs 120 in the wireless communication network 100.
  • a UE 120 (instead of a network node 110) may perform, or collaborate or negotiate with one or more other UEs to perform, scheduling operations, resource selection operations, and/or other operations for sidelink communications.
  • some of the network nodes 110 and the UEs 120 of the wireless communication network 100 may be configured for full-duplex operation in addition to half-duplex operation.
  • a network node 110 or a UE 120 operating in a half-duplex mode may perform only one of transmission or reception during particular time resources, such as during particular slots, symbols, or other time periods.
  • Half-duplex operation may involve time-division duplexing (TDD) , in which DL transmissions of the network node 110 and UL transmissions of the UE 120 do not occur in the same time resources (that is, the transmissions do not overlap in time) .
  • TDD time-division duplexing
  • a network node 110 or a UE 120 operating in a full-duplex mode can transmit and receive communications concurrently (for example, in the same time resources) .
  • network nodes 110 and/or UEs 120 may generally increase the capacity of the network and the radio access link.
  • full-duplex operation may involve frequency-division duplexing (FDD) , in which DL transmissions of the network node 110 are performed in a first frequency band or on a first component carrier and transmissions of the UE 120 are performed in a second frequency band or on a second component carrier different than the first frequency band or the first component carrier, respectively.
  • FDD frequency-division duplexing
  • full-duplex operation may be enabled for a UE 120 but not for a network node 110.
  • a UE 120 may simultaneously transmit an UL transmission to a first network node 110 and receive a DL transmission from a second network node 110 in the same time resources.
  • full-duplex operation may be enabled for a network node 110 but not for a UE 120.
  • a network node 110 may simultaneously transmit a DL transmission to a first UE 120 and receive an UL transmission from a second UE 120 in the same time resources.
  • full-duplex operation may be enabled for both a network node 110 and a UE 120.
  • the UEs 120 and the network nodes 110 may perform MIMO communication.
  • MIMO generally refers to transmitting or receiving multiple signals (such as multiple layers or multiple data streams) simultaneously over the same time and frequency resources.
  • MIMO techniques generally exploit multipath propagation.
  • MIMO may be implemented using various spatial processing or spatial multiplexing operations.
  • MIMO may support simultaneous transmission to multiple receivers, referred to as multi-user MIMO (MU-MIMO) .
  • MU-MIMO multi-user MIMO
  • Some RATs may employ advanced MIMO techniques, such as multiple TRP (mTRP) operation (including redundant transmission or reception on multiple TRPs) , reciprocity in the time domain or the frequency domain, single-frequency-network (SFN) transmission, or non-coherent joint transmission (NC-JT) .
  • mTRP multiple TRP
  • SFN single-frequency-network
  • NC-JT non-coherent joint transmission
  • a UE may include a communication manager 140.
  • the communication manager 140 may receive a TCI activation MAC-CE; select a TCI codepoint based at least in part on the TCI activation MAC-CE; select a TCI state in the TCI codepoint; and transmit a PDCCH ordered PRACH transmission based at least in part on the TCI state. Additionally, or alternatively, the communication manager 140 may perform one or more other operations described herein.
  • Fig. 1 is provided as an example. Other examples may differ from what is described with regard to Fig. 1.
  • Fig. 2 is a diagram illustrating an example network node 110 in communication with an example UE 120 in a wireless network in accordance with the present disclosure.
  • the network node 110 may include a data source 212, a transmit processor 214, a transmit (TX) MIMO processor 216, a set of modems 232 (shown as 232a through 232t, where t ⁇ 1) , a set of antennas 234 (shown as 234a through 234v, where v ⁇ 1) , a MIMO detector 236, a receive processor 238, a data sink 239, a controller/processor 240, a memory 242, a communication unit 244, and/or a scheduler 246, among other examples.
  • TX transmit
  • one or a combination of the antenna (s) 234, the modem (s) 232, the MIMO detector 236, the receive processor 238, the transmit processor 214, and/or the TX MIMO processor 216 may be included in a transceiver of the network node 110.
  • the transceiver may be under control of and used by one or more processors, such as the controller/processor 240, and in some aspects in conjunction with processor-readable code stored in the memory 242, to perform aspects of the methods, processes, and/or operations described herein.
  • the network node 110 may include one or more interfaces, communication components, and/or other components that facilitate communication with the UE 120 or another network node.
  • processors may refer to one or more controllers and/or one or more processors.
  • processors may include transmit processor 214, TX MIMO processor 216, MIMO detector 236, receive processor 238, and/or controller/processor 240.
  • processors of the UE 120 may include MIMO detector 256, receive processor 258, transmit processor 264, TX MIMO processor 266, and/or controller/processor 280.
  • a single processor may perform all of the operations described as being performed by the one or more processors.
  • a first set of (one or more) processors of the one or more processors may perform a first operation described as being performed by the one or more processors
  • a second set of (one or more) processors of the one or more processors may perform a second operation described as being performed by the one or more processors.
  • the first set of processors and the second set of processors may be the same set of processors or may be different sets of processors.
  • Reference to “one or more memories” should be understood to refer to any one or more memories of a corresponding device, such as the memory described in connection with Fig. 2. For example, operation described as being performed by one or more memories can be performed by the same subset of the one or more memories or different subsets of the one or more memories.
  • the transmit processor 214 may receive data ( “downlink data” ) intended for the UE 120 (or a set of UEs that includes the UE 120) from the data source 212 (such as a data pipeline or a data queue) .
  • the transmit processor 214 may select one or more MCSs for the UE 120 in accordance with one or more channel quality indicators (CQIs) received from the UE 120.
  • the network node 110 may process the data (for example, including encoding the data) for transmission to the UE 120 on a downlink in accordance with the MCS (s) selected for the UE 120 to generate data symbols.
  • the transmit processor 214 may process system information (for example, semi-static resource partitioning information (SRPI) ) and/or control information (for example, CQI requests, grants, and/or upper layer signaling) and provide overhead symbols and/or control symbols.
  • the transmit processor 214 may generate reference symbols for reference signals (for example, a cell-specific reference signal (CRS) , a demodulation reference signal (DMRS) , or a channel state information (CSI) reference signal (CSI-RS) ) and/or synchronization signals (for example, a primary synchronization signal (PSS) or a secondary synchronization signals (SSS) ) .
  • reference signals for example, a cell-specific reference signal (CRS) , a demodulation reference signal (DMRS) , or a channel state information (CSI) reference signal (CSI-RS)
  • CSI-RS channel state information reference signal
  • synchronization signals for example, a primary synchronization signal (PSS) or a secondary synchronization signals (SSS)
  • the TX MIMO processor 216 may perform spatial processing (for example, precoding) on the data symbols, the control symbols, the overhead symbols, and/or the reference symbols, if applicable, and may provide a set of output symbol streams (for example, T output symbol streams) to the set of modems 232.
  • each output symbol stream may be provided to a respective modulator component (shown as MOD) of a modem 232.
  • Each modem 232 may use the respective modulator component to process (for example, to modulate) a respective output symbol stream (for example, for orthogonal frequency division multiplexing (OFDM) ) to obtain an output sample stream.
  • OFDM orthogonal frequency division multiplexing
  • Each modem 232 may further use the respective modulator component to process (for example, convert to analog, amplify, filter, and/or upconvert) the output sample stream to obtain a time domain downlink signal.
  • the modems 232a through 232t may together transmit a set of downlink signals (for example, T downlink signals) via the corresponding set of antennas 234.
  • a downlink signal may include a DCI communication, a MAC control element (MAC-CE) communication, an RRC communication, a downlink reference signal, or another type of downlink communication.
  • Downlink signals may be transmitted on a PDCCH, a PDSCH, and/or on another downlink channel.
  • a downlink signal may carry one or more transport blocks (TBs) of data.
  • a TB may be a unit of data that is transmitted over an air interface in the wireless communication network 100.
  • a data stream (for example, from the data source 212) may be encoded into multiple TBs for transmission over the air interface. The quantity of TBs used to carry the data associated with a particular data stream may be associated with a TB size common to the multiple TBs.
  • the TB size may be based on or otherwise associated with radio channel conditions of the air interface, the MCS used for encoding the data, the downlink resources allocated for transmitting the data, and/or another parameter.
  • the larger the TB size the greater the amount of data that can be transmitted in a single transmission, which reduces signaling overhead.
  • larger TB sizes may be more prone to transmission and/or reception errors than smaller TB sizes, but such errors may be mitigated by more robust error correction techniques.
  • uplink signals from the UE 120 may be received by an antenna 234, may be processed by a modem 232 (for example, a demodulator component, shown as DEMOD, of a modem 232) , may be detected by the MIMO detector 236 (for example, an Rx MIMO processor) if applicable, and/or may be further processed by the receive processor 238 to obtain decoded data and/or control information.
  • the receive processor 238 may provide the decoded data to a data sink 239 (which may be a data pipeline, a data queue, and/or another type of data sink) and provide the decoded control information to a processor, such as the controller/processor 240.
  • the network node 110 may use the scheduler 246 to schedule one or more UEs 120 for downlink or uplink communications.
  • the scheduler 246 may use DCI to dynamically schedule DL transmissions to the UE 120 and/or UL transmissions from the UE 120.
  • the scheduler 246 may allocate recurring time domain resources and/or frequency domain resources that the UE 120 may use to transmit and/or receive communications using an RRC configuration (for example, a semi-static configuration) , for example, to perform semi-persistent scheduling (SPS) or to configure a configured grant (CG) for the UE 120.
  • RRC configuration for example, a semi-static configuration
  • SPS semi-persistent scheduling
  • CG configured grant
  • One or more of the transmit processor 214, the TX MIMO processor 216, the modem 232, the antenna 234, the MIMO detector 236, the receive processor 238, and/or the controller/processor 240 may be included in an RF chain of the network node 110.
  • An RF chain may include one or more filters, mixers, oscillators, amplifiers, analog-to-digital converters (ADCs) , and/or other devices that convert between an analog signal (such as for transmission or reception via an air interface) and a digital signal (such as for processing by one or more processors of the network node 110) .
  • the RF chain may be or may be included in a transceiver of the network node 110.
  • the network node 110 may use the communication unit 244 to communicate with a core network and/or with other network nodes.
  • the communication unit 244 may support wired and/or wireless communication protocols and/or connections, such as Ethernet, optical fiber, common public radio interface (CPRI) , and/or a wired or wireless backhaul, among other examples.
  • the network node 110 may use the communication unit 244 to transmit and/or receive data associated with the UE 120 or to perform network control signaling, among other examples.
  • the communication unit 244 may include a transceiver and/or an interface, such as a network interface.
  • the UE 120 may include a set of antennas 252 (shown as antennas 252a through 252r, where r ⁇ 1) , a set of modems 254 (shown as modems 254a through 254u, where u ⁇ 1) , a MIMO detector 256, a receive processor 258, a data sink 260, a data source 262, a transmit processor 264, a TX MIMO processor 266, a controller/processor 280, a memory 282, and/or a communication manager 140, among other examples.
  • One or more of the components of the UE 120 may be included in a housing 284.
  • one or a combination of the antenna (s) 252, the modem (s) 254, the MIMO detector 256, the receive processor 258, the transmit processor 264, or the TX MIMO processor 266 may be included in a transceiver that is included in the UE 120.
  • the transceiver may be under control of and used by one or more processors, such as the controller/processor 280, and in some aspects in conjunction with processor-readable code stored in the memory 282, to perform aspects of the methods, processes, or operations described herein.
  • the UE 120 may include another interface, another communication component, and/or another component that facilitates communication with the network node 110 and/or another UE 120.
  • the set of antennas 252 may receive the downlink communications or signals from the network node 110 and may provide a set of received downlink signals (for example, R received signals) to the set of modems 254.
  • each received signal may be provided to a respective demodulator component (shown as DEMOD) of a modem 254.
  • DEMOD demodulator component
  • Each modem 254 may use the respective demodulator component to condition (for example, filter, amplify, downconvert, and/or digitize) a received signal to obtain input samples.
  • Each modem 254 may use the respective demodulator component to further demodulate or process the input samples (for example, for OFDM) to obtain received symbols.
  • the MIMO detector 256 may obtain received symbols from the set of modems 254, may perform MIMO detection on the received symbols if applicable, and may provide detected symbols.
  • the receive processor 258 may process (for example, decode) the detected symbols, may provide decoded data for the UE 120 to the data sink 260 (which may include a data pipeline, a data queue, and/or an application executed on the UE 120) , and may provide decoded control information and system information to the controller/processor 280.
  • the transmit processor 264 may receive and process data ( “uplink data” ) from a data source 262 (such as a data pipeline, a data queue, and/or an application executed on the UE 120) and control information from the controller/processor 280.
  • the control information may include one or more parameters, feedback, one or more signal measurements, and/or other types of control information.
  • the receive processor 258 and/or the controller/processor 280 may determine, for a received signal (such as received from the network node 110 or another UE) , one or more parameters relating to transmission of the uplink communication.
  • the one or more parameters may include a reference signal received power (RSRP) parameter, a received signal strength indicator (RSSI) parameter, a reference signal received quality (RSRQ) parameter, a CQI parameter, or a transmit power control (TPC) parameter, among other examples.
  • the control information may include an indication of the RSRP parameter, the RSSI parameter, the RSRQ parameter, the CQI parameter, the TPC parameter, and/or another parameter.
  • the control information may facilitate parameter selection and/or scheduling for the UE 120 by the network node 110.
  • the transmit processor 264 may generate reference symbols for one or more reference signals, such as an uplink DMRS, an uplink sounding reference signal (SRS) , and/or another type of reference signal.
  • the symbols from the transmit processor 264 may be precoded by the TX MIMO processor 266, if applicable, and further processed by the set of modems 254 (for example, for DFT-s-OFDM or CP-OFDM) .
  • the TX MIMO processor 266 may perform spatial processing (for example, precoding) on the data symbols, the control symbols, the overhead symbols, and/or the reference symbols, if applicable, and may provide a set of output symbol streams (for example, U output symbol streams) to the set of modems 254.
  • each output symbol stream may be provided to a respective modulator component (shown as MOD) of a modem 254.
  • Each modem 254 may use the respective modulator component to process (for example, to modulate) a respective output symbol stream (for example, for OFDM) to obtain an output sample stream.
  • Each modem 254 may further use the respective modulator component to process (for example, convert to analog, amplify, filter, and/or upconvert) the output sample stream to obtain an uplink signal.
  • the modems 254a through 254u may transmit a set of uplink signals (for example, R uplink signals or U uplink symbols) via the corresponding set of antennas 252.
  • An uplink signal may include a UCI communication, a MAC-CE communication, an RRC communication, or another type of uplink communication.
  • Uplink signals may be transmitted on a PUSCH, a PUCCH, and/or another type of uplink channel.
  • An uplink signal may carry one or more TBs of data.
  • Sidelink data and control transmissions may generally use similar techniques as were described for uplink data and control transmission, and may use sidelink-specific channels such as a physical sidelink shared channel (PSSCH) , a physical sidelink control channel (PSCCH) , and/or a physical sidelink feedback channel (PSFCH) .
  • PSSCH physical sidelink shared channel
  • PSCCH physical sidelink control channel
  • PSFCH physical sidelink feedback channel
  • One or more antennas of the set of antennas 252 or the set of antennas 234 may include, or may be included within, 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.
  • An antenna panel, an antenna group, a set of antenna elements, or an antenna array may include one or more antenna elements (within a single housing or multiple housings) , a set of coplanar antenna elements, a set of non-coplanar antenna elements, or one or more antenna elements coupled with one or more transmission or reception components, such as one or more components of Fig. 2.
  • 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.
  • 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 of the group of antennas.
  • Antenna module may refer to circuitry including one or more antennas, which may also include one or more other components (such as filters, amplifiers, or processors) associated with integrating the antenna module into a wireless communication device.
  • each of the antenna elements of an antenna 234 or an antenna 252 may include one or more sub-elements for radiating or receiving radio frequency signals.
  • a single antenna element may include a first sub-element cross-polarized with a second sub-element that can be used to independently transmit cross-polarized signals.
  • the antenna elements may include patch antennas, dipole antennas, and/or other types of antennas arranged in a linear pattern, a two-dimensional pattern, or another pattern.
  • a spacing between antenna elements may be such that signals with a desired wavelength transmitted separately by the antenna elements may interact or interfere constructively and destructively along various directions (such as to form a desired beam) .
  • the spacing may provide a quarter wavelength, a half wavelength, or another fraction of a wavelength of spacing between neighboring antenna elements to allow for the desired constructive and destructive interference patterns of signals transmitted by the separate antenna elements within that expected range.
  • the amplitudes and/or phases of signals transmitted via antenna elements and/or sub-elements may be modulated and shifted relative to each other (such as by manipulating phase shift, phase offset, and/or amplitude) to generate one or more beams, which is referred to as beamforming.
  • beam may refer to a directional transmission of a wireless signal toward a receiving device or otherwise in a desired direction.
  • Beam may also generally refer to a direction associated with such a directional signal transmission, a set of directional resources associated with the signal transmission (for example, an angle of arrival, a horizontal direction, and/or a vertical direction) , and/or a set of parameters that indicate one or more aspects of a directional signal, a direction associated with the signal, and/or a set of directional resources associated with the signal.
  • antenna elements may be individually selected or deselected for directional transmission of a signal (or signals) by controlling amplitudes of one or more corresponding amplifiers and/or phases of the signal (s) to form one or more beams.
  • the shape of a beam (such as the amplitude, width, and/or presence of side lobes) and/or the direction of a beam (such as an angle of the beam relative to a surface of an antenna array) can be dynamically controlled by modifying the phase shifts, phase offsets, and/or amplitudes of the multiple signals relative to each other.
  • Different UEs 120 or network nodes 110 may include different numbers of antenna elements.
  • a UE 120 may include a single antenna element, two antenna elements, four antenna elements, eight antenna elements, or a different number of antenna elements.
  • a network node 110 may include eight antenna elements, 24 antenna elements, 64 antenna elements, 128 antenna elements, or a different number of antenna elements.
  • a larger number of antenna elements may provide increased control over parameters for beam generation relative to a smaller number of antenna elements, whereas a smaller number of antenna elements may be less complex to implement and may use less power than a larger number of antenna elements.
  • Multiple antenna elements may support multiple-layer transmission, in which a first layer of a communication (which may include a first data stream) and a second layer of a communication (which may include a second data stream) are transmitted using the same time and frequency resources with spatial multiplexing.
  • While blocks in Fig. 2 are illustrated as distinct components, the functions described above with respect to the blocks may be implemented in a single hardware, software, or combination component or in various combinations of components.
  • the functions described with respect to the transmit processor 264, the receive processor 258, and/or the TX MIMO processor 266 may be performed by or under the control of the controller/processor 280.
  • Fig. 2 is provided as an example. Other examples may differ from what is described with regard to Fig. 2.
  • Fig. 3 is a diagram illustrating an example disaggregated base station architecture 300 in accordance with the present disclosure.
  • One or more components of the example disaggregated base station architecture 300 may be, may include, or may be included in one or more network nodes (such one or more network nodes 110) .
  • the disaggregated base station architecture 300 may include a CU 310 that can communicate directly with a core network 320 via a backhaul link, or that can communicate indirectly with the core network 320 via one or more disaggregated control units, such as a Non-RT RIC 350 associated with a Service Management and Orchestration (SMO) Framework 360 and/or a Near-RT RIC 370 (for example, via an E2 link) .
  • SMO Service Management and Orchestration
  • the CU 310 may communicate with one or more DUs 330 via respective midhaul links, such as via F1 interfaces.
  • Each of the DUs 330 may communicate with one or more RUs 340 via respective fronthaul links.
  • Each of the RUs 340 may communicate with one or more UEs 120 via respective RF access links.
  • a UE 120 may be simultaneously served by multiple RUs 340.
  • Each of the components of the disaggregated base station architecture 300 may include one or more interfaces or may be coupled with one or more interfaces for receiving or transmitting signals, such as data or information, via a wired or wireless transmission medium.
  • the CU 310 may be logically split into one or more CU user plane (CU-UP) units and one or more CU control plane (CU-CP) units.
  • a CU-UP unit may communicate bidirectionally with a CU-CP unit via an interface, such as the E1 interface when implemented in an O-RAN configuration.
  • the CU 310 may be deployed to communicate with one or more DUs 330, as necessary, for network control and signaling.
  • Each DU 330 may correspond to a logical unit that includes one or more base station functions to control the operation of one or more RUs 340.
  • a DU 330 may host various layers, such as an RLC layer, a MAC layer, or one or more PHY layers, such as one or more high PHY layers or one or more low PHY layers.
  • Each layer (which also may be referred to as a module) may be implemented with an interface for communicating signals with other layers (and modules) hosted by the DU 330, or for communicating signals with the control functions hosted by the CU 310.
  • Each RU 340 may implement lower layer functionality. In some aspects, real-time and non-real-time aspects of control and user plane communication with the RU (s) 340 may be controlled by the corresponding DU 330.
  • the SMO Framework 360 may support RAN deployment and provisioning of non-virtualized and virtualized network elements.
  • the SMO Framework 360 may support the deployment of dedicated physical resources for RAN coverage requirements, which may be managed via an operations and maintenance interface, such as an O1 interface.
  • the SMO Framework 360 may interact with a cloud computing platform (such as an open cloud (O-Cloud) platform 390) to perform network element life cycle management (such as to instantiate virtualized network elements) via a cloud computing platform interface, such as an O2 interface.
  • a cloud computing platform such as an open cloud (O-Cloud) platform 390
  • network element life cycle management such as to instantiate virtualized network elements
  • a virtualized network element may include, but is not limited to, a CU 310, a DU 330, an RU 340, a non-RT RIC 350, and/or a Near-RT RIC 370.
  • the SMO Framework 360 may communicate with a hardware aspect of a 4G RAN, a 5G NR RAN, and/or a 6G RAN, such as an open eNB (O-eNB) 380, via an O1 interface. Additionally or alternatively, the SMO Framework 360 may communicate directly with each of one or more RUs 340 via a respective O1 interface. In some deployments, this configuration can enable each DU 330 and the CU 310 to be implemented in a cloud-based RAN architecture, such as a vRAN architecture.
  • the Non-RT RIC 350 may include or may implement a logical function that enables non-real-time control and optimization of RAN elements and resources, AI/ML workflows including model training and updates, and/or policy-based guidance of applications and/or features in the Near-RT RIC 370.
  • the Non-RT RIC 350 may be coupled to or may communicate with (such as via an A1 interface) the Near-RT RIC 370.
  • the Near-RT RIC 370 may include or may implement a logical function that enables near-real-time control and optimization of RAN elements and resources via data collection and actions via an interface (such as via an E2 interface) connecting one or more CUs 310, one or more DUs 330, and/or an O-eNB with the Near-RT RIC 370.
  • the Non-RT RIC 350 may receive parameters or external enrichment information from external servers. Such information may be utilized by the Near-RT RIC 370 and may be received at the SMO Framework 360 or the Non-RT RIC 350 from non-network data sources or from network functions. In some examples, the Non-RT RIC 350 or the Near-RT RIC 370 may tune RAN behavior or performance. For example, the Non-RT RIC 350 may monitor long-term trends and patterns for performance and may employ AI/ML models to perform corrective actions via the SMO Framework 360 (such as reconfiguration via an O1 interface) or via creation of RAN management policies (such as A1 interface policies) .
  • SMO Framework 360 such as reconfiguration via an O1 interface
  • RAN management policies such as A1 interface policies
  • the network node 110, the controller/processor 240 of the network node 110, the UE 120, the controller/processor 280 of the UE 120, the CU 310, the DU 330, the RU 340, or any other component (s) of Figs. 1, 2, or 3 may implement one or more techniques or perform one or more operations associated with selecting a TCI for a PRACH transmission, as described in more detail elsewhere herein.
  • the controller/processor 240 of the network node 110, the controller/processor 280 of the UE 120, any other component (s) of Fig. 2, the CU 310, the DU 330, or the RU 340 may perform or direct operations of, for example, process 700 of Fig.
  • the memory 242 may store data and program codes for the network node 110, the network node 110, the CU 310, the DU 330, or the RU 340.
  • the memory 282 may store data and program codes for the UE 120.
  • the memory 242 or the memory 282 may include a non-transitory computer-readable medium storing a set of instructions (for example, code or program code) for wireless communication.
  • the memory 242 may include one or more memories, such as a single memory or multiple different memories (of the same type or of different types) .
  • the memory 282 may include one or more memories, such as a single memory or multiple different memories (of the same type or of different types) .
  • the set of instructions when executed (for example, directly, or after compiling, converting, or interpreting) by one or more processors of the network node 110, the UE 120, the CU 310, the DU 330, or the RU 340, may cause the one or more processors to perform process 700 of Fig. 7, or other processes as described herein.
  • executing instructions may include running the instructions, converting the instructions, compiling the instructions, and/or interpreting the instructions, among other examples.
  • a UE (e.g., the UE 120) includes means for receiving a TCI activation MAC-CE; means for selecting a TCI codepoint based at least in part on the TCI activation MAC-CE; means for selecting a TCI state in the TCI codepoint; and/or means for transmitting a PDCCH ordered PRACH transmission based at least in part on the TCI state.
  • the means for the UE to perform operations described herein may include, for example, one or more of communication manager 140, antenna 252, modem 254, MIMO detector 256, receive processor 258, transmit processor 264, TX MIMO processor 266, controller/processor 280, or memory 282.
  • Fig. 3 is provided as an example. Other examples may differ from what is described with regard to Fig. 3.
  • Fig. 4 is a diagram illustrating an example 400 of an uplink dense deployment, in accordance with the present disclosure.
  • an uplink dense deployment may be used to improve a coverage and/or a capacity of an uplink direction.
  • the uplink dense deployment may be associated with an asymmetric downlink/uplink densification.
  • An uplink Rx point e.g., an uplink-only node
  • Downlink signals and/or downlink channels transmitted from a network node 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 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 uplink Rx points do not transmit any downlink signal.
  • the uplink Rx points may receive an uplink signal and send the uplink signal to the network node with or without processing.
  • Fig. 4 is provided as an example. Other examples may differ from what is described with regard to Fig. 4.
  • a DCI format 1_0 scrambled by a C-RNTI with corresponding FDRA fields set to all ones may be used for a random access procedure initiated by a PDCCH order.
  • the DCI format 1_0 for the PDCCH order may include various fields.
  • the DCI format 1_0 for the PDCCH order may include a random access preamble index field (6 bits) .
  • the DCI format 1_0 for the PDCCH order may include an uplink or supplementary uplink (SUL) indicator field (1 bit) .
  • SUL uplink
  • the uplink/SUL indicator field may indicate which uplink carrier in the cell to use for a PRACH transmission. Otherwise, the uplink/SUL indicator field may be reserved.
  • the DCI format 1_0 for the PDCCH order may include an SS/PBCH index field (6 bits) .
  • the SS/PBCH index field may indicate an SS/PBCH to be used to determine a random access channel (RACH) occasion for the PRACH transmission. Otherwise, the SS/PBCH index field may be reserved.
  • the DCI format 1_0 for the PDCCH order may include a PRACH mask index field (4 bits) .
  • the PRACH mask index field may indicate a RACH occasion associated with an SS/PBCH indicated by an SS/PBCH index for the PRACH transmission. Otherwise, the PRACH mask index field may be reserved.
  • the DCI format 1_0 for the PDCCH order may include a PRACH association indicator field (0 bits or 1 bit) .
  • the PRACH association indicator field may be 1 bit when the UE is provided with a tag identifier (tag-Id2) , and the UE is not provided a control resource set (CORESET) pool index (coresetPoolIndex) , or is provided a CORESET pool index with value 0 for first CORESETs and is provided a CORESET pool index with value 1 for second CORESETs.
  • CORESET control resource set
  • the PRACH association indicator field may indicate a physical cell identifier (PCI) associated with the PRACH transmission when the UE is provided a synchronization signal block (SSB) MTC additional PCI (SSB-MTC-AddtionalPCI) parameter.
  • PCI physical cell identifier
  • SSB synchronization signal block
  • SSB-MTC-AddtionalPCI MTC additional PCI
  • a bit field index 0 of the PRACH association indicator field may be mapped to a PCI of a serving cell, and a bit field index 1 of the PRACH association indicator field may be mapped to an active additional PCI.
  • the PRACH association indicator field may indicate a pathloss reference signal (PL-RS) for the PRACH transmission when the UE is not provided the SSB MTC additional PCI parameter.
  • PL-RS pathloss reference signal
  • a bit field index 0 of the PRACH association indicator field may be mapped to a downlink reference signal (DL RS) that a DMRS of the PDCCH order is quasi-co-located with, and a bit field index 1 of the PRACH association indicator field may be mapped to an SS/PBCH indicated by the SS/PBCH index field in the DCI format 1_0 for the PDCCH order. Otherwise, the PRACH association indicator field may be 0 bits.
  • the DCI format 1_0 for the PDCCH order may include reserved bits.
  • a same spatial domain transmission filter (Tx beam) used for reception (Rx beam) of a corresponding SSB or CSI-RS may be used.
  • an uplink TRP is different than a downlink TRP
  • an Rx beam of a downlink signal/channel should not be used for a Tx beam of the PRACH transmission.
  • a TCI state may be indicated in a PDCCH order DCI for a PDCCH ordered PRACH.
  • the TCI state may be a single TCI state in a TCI codepoint.
  • one TCI codepoint may include multiple TCI states.
  • the specific TCI state, of the multiple TCI states, that should be used for the PDCCH ordered PRACH may be ambiguous to a UE and/or a network node, thereby degrading an overall system performance.
  • a UE may receive, from a network node, a TCI activation MAC-CE.
  • the UE may be associated with a single transmission-reception point (TRP) or multiple TRPs.
  • the UE may be associated with an uplink dense environment in which an uplink TRP is different than a downlink TRP.
  • the TCI activation MAC-CE may include one or more TCI codepoints, where each TCI codepoint may include one or more TCI states.
  • the UE may select a TCI codepoint based at least in part on the TCI activation MAC-CE.
  • the UE may select the TCI codepoint based at least in part on a default rule and/or a beam indication DCI.
  • the UE may apply the default rule based at least in part on the beam indication DCI not being received by the UE, or the UE may apply the default rule before applying the TCI state, where the TCI state may be indicated from configured TCI states.
  • the UE may receive, from the network node, a PDCCH order DCI that includes an explicit indication, and the UE may select the TCI codepoint based at least in part on the explicit indication.
  • the UE may select a TCI state in the TCI codepoint.
  • the UE may select the TCI state based at least in part on a default rule.
  • the UE may receive, from the network node, a PDCCH order DCI that includes an explicit indication, and the UE may select the TCI state based at least in part on the explicit indication.
  • the UE may transmit, to the network node, a PDCCH ordered PRACH transmission based at least in part on the TCI state. In other words, the UE may transmit the PDCCH ordered PRACH transmission using the TCI state selected from the TCI codepoint.
  • the UE may be able to determine which TCI state in a TCI codepoint should be used for the PRACH transmission.
  • the TCI codepoint may include multiple TCI states
  • the PRACH transmission may be the PDCCH ordered PRACH transmission.
  • the UE may select an appropriate TCI state as part of a TCI state determination for the PDCCH ordered PRACH transmission in a specific scenario of uplink dense deployment, in which no correlation exists between a downlink beam pair and an uplink beam pair.
  • the UE may be able to select the appropriate TCI state, from the multiple TCI states, for the PDCCH ordered PRACH transmission, which may improve an overall system performance.
  • Fig. 5 is a diagram illustrating an example 500 associated with selecting a TCI for a PRACH transmission, in accordance with the present disclosure.
  • example 500 includes communication between a UE (e.g., UE 120) and a network node (e.g., network node 110) .
  • the UE and the network node may be included in a wireless network, such as wireless network 100.
  • the network node may be associated with a single TRP or multiple TRPs.
  • the UE and the network node may be associated with an uplink dense environment, in which an uplink TRP may be different from a downlink TRP.
  • the UE may receive, from the network node, a TCI activation MAC-CE.
  • the TCI activation MAC-CE may include one or more TCI codepoints, where each TCI codepoint may include one or more TCI states.
  • the UE may select a TCI codepoint based at least in part on the TCI activation MAC-CE.
  • the UE may select the TCI codepoint based at least in part on a default rule and/or a beam indication DCI.
  • the UE may apply the default rule based at least in part on the beam indication DCI not being received by the UE.
  • the UE may apply the default rule before applying the TCI state, where the TCI state may be indicated by configured TCI states.
  • the UE may select a TCI codepoint with a lowest index among TCI codepoints activated by the TCI activation MAC-CE, in accordance with the default rule. In some aspects, the UE may select a TCI codepoint with a lowest index among TCI codepoints activated by the TCI activation MAC-CE, in accordance with the default rule, where the TCI codepoint may include at least one joint TCI state or uplink TCI state. In some aspects, the UE may select a TCI codepoint with a lowest index among TCI codepoints activated by the TCI activation MAC-CE, in accordance with the default rule, where the TCI codepoint may include two joint TCI states or two uplink TCI states.
  • the UE may receive, from the network node, a PDCCH order DCI that includes an explicit indication.
  • the UE may select the TCI codepoint based at least in part on the explicit indication in the PDCCH order DCI.
  • the explicit indication may be a field that indicates one or more activated TCI states corresponding to the TCI codepoint.
  • the UE may receive, from the network node, the TCI activation MAC-CE, and then the UE may transmit, to the network node, a PDCCH ordered PRACH transmission.
  • the UE may select one or more activated TCI states corresponding to a TCI codepoint.
  • the UE may determine the TCI codepoint based at least in part on the default rule and/or the beam indication DCI, or the UE may determine the TCI codepoint based at least in part on the explicit indication in the PDCCH order DCI.
  • the UE may determine the TCI codepoint for a single TRP (sTRP) only scenario and/or an mTRP only scenario.
  • sTRP single TRP
  • the default rule may be applied based at least in part on a first condition or a second condition.
  • the UE may follow the default rule when the UE has not yet received the beam indication DCI.
  • the UE may follow the default rule before applying an indicated TCI state from configured TCI states.
  • the UE may use the TCI codepoint with the lowest index among TCI codepoints activated by the TCI activation MAC-CE.
  • the UE may use the TCI codepoint with the lowest index among TCI codepoints activated by the TCI activation MAC-CE, where the TCI codepoint may contain at least one joint/uplink TCI state.
  • the UE may use the TCI codepoint with the lowest index among TCI codepoints activated by the TCI activation MAC-CE, where the TCI codepoint may contain two joint/uplink TCI states.
  • the network node may use a field to explicitly indicate, to the UE, one or more activated TCI states corresponding to a TCI codepoint.
  • the field may be the explicit indication in the PDCCH order DCI.
  • the UE may select a TCI state in the TCI codepoint.
  • the UE may select the TCI state in the TCI codepoint based at least in part on a default rule, and the TCI state may include one or more of a first TCI state or a second TCI state.
  • the UE may apply the first TCI state in the TCI codepoint, in accordance with the default rule.
  • the UE may apply the second TCI state in the TCI codepoint, in accordance with the default rule.
  • the UE may apply the TCI state, which may be associated with a pathloss offset in the TCI codepoint, in accordance with the default rule. In some aspects, when selecting the TCI state, the UE may apply the first TCI state and the second TCI state in the TCI codepoint based at least in part on a PRACH repetition for multiple TRPs, in accordance with the default rule.
  • the UE when selecting the TCI state, may apply the first TCI state in the TCI codepoint when a PDCCH order DCI is scrambled with a first radio network temporary identifier (RNTI) and the second TCI state in the TCI codepoint when the PDCCH order DCI is scrambled with a second RNTI, in accordance with the default rule.
  • RNTI radio network temporary identifier
  • the UE when selecting the TCI state, may apply the first TCI state in the TCI codepoint when a PDCCH order DCI is transmitted in odd slot, subframe, or system frame numbers and the second TCI state in the TCI codepoint when the PDCCH order DCI is transmitted in even slot, subframe, or system frame numbers, in accordance with the default rule.
  • the UE may receive, from the network node, a PDCCH order DCI that includes an explicit indication.
  • the UE may select the TCI state in the TCI codepoint based at least in part on the explicit indication included in the PDCCH order DCI.
  • the explicit indication may be associated with a TCI state selection field in the PDCCH order DCI.
  • the explicit indication may be a two-bit field that indicates the TCI state in the TCI codepoint to be used.
  • the UE may determine the TCI codepoint based at least in part on the default rule and the beam indication DCI, or the UE may determine the TCI codepoint based at least in part on the PDCCH order DCI. After the UE determines the TCI codepoint, the UE may determine which TCI state in the TCI codepoint is to be used for the PDCCH ordered PRACH transmission. The UE may determine the TCI state based at least in part on the default rule, or the UE may determine the TCI state based at least in part on the explicit indication in the PDCCH order DCI.
  • the UE may determine the TCI state based at least in part on the default rule. In a first option, the UE may always apply the first TCI state in the TCI codepoint, in accordance with the default rule. In a second option, the UE may always apply the second TCI state in the TCI codepoint, in accordance with the default rule. In a third option, when only one TCI state is configured with a pathloss offset, the UE may apply that TCI state (e.g., a TCI state associated with an uplink TRP) , in accordance with the default rule.
  • TCI state e.g., a TCI state associated with an uplink TRP
  • the UE may apply both TCI states (e.g., two TCI states) when a PRACH repetition for an mTRP scenario is configured, in accordance with the default rule.
  • the UE may use the first TCI state in the TCI codepoint when the PDCCH order DCI is scrambled with a first RNTI, and the second TCI state in the TCI codepoint when the PDCCH order DCI is scrambled with a second RNTI, in accordance with the default rule.
  • the UE may use a first TCI state in the TCI codepoint when the PDCCH order DCI is transmitted in odd slot/sub-frame/system frame numbers, and a second TCI state in the TCI codepoint when the PDCCH order DCI is transmitted in even slot/sub-frame/system frame numbers, in accordance with the default rule.
  • the UE may determine the TCI state based at least in part on the explicit indication.
  • the PDCCH order DCI may include the TCI state selection field to explicitly indicate which TCI state in the TCI codepoint is to be used.
  • the TCI state selection field may be the explicit indication in the PDCCH order DCI.
  • the TCI state selection field may be two bits, and some of the reserved bits in the PDCCH order DCI may be used for this purpose (e.g., some of the reserved bits may be used to explicitly indicate the TCI state) .
  • the TCI state selection field may be present when a TCI selection present in DCI PRACH “tciSelection-PresentInDCI-PRACH” higher layer parameter is configured by the network node.
  • the two bits may be used to convey a bit field mapped to an index.
  • a first TCI state in a TCI codepoint may be applied, in accordance with a TCI state determination.
  • a second TCI state in the TCI codepoint may be applied, in accordance with the TCI state determination.
  • the bit field e.g., 10) is mapped to index 2
  • both two TCI states may be applied, in accordance with the TCI state determination.
  • An order may be a first TCI state corresponding to a first set of PRACH occasions, and a second TCI state corresponding to a second set of PRACH occasions.
  • both of the two TCI states may be applied, in accordance with the TCI state determination.
  • An order may be a first TCI state corresponding to a second set of PRACH occasions, and a second TCI state corresponding to a first set of PRACH occasions.
  • the UE may transmit, to the network node, the PDCCH ordered PRACH transmission based at least in part on the TCI state, where the TCI state may be selected from the TCI codepoint.
  • the UE may transmit the PDCCH ordered PRACH transmission in accordance with the TCI state.
  • the UE may be able to select an appropriate TCI state for the PDCCH ordered PRACH transmission.
  • Fig. 5 is provided as an example. Other examples may differ from what is described with regard to Fig. 5.
  • Fig. 6 is a diagram illustrating an example 600 associated with selecting a TCI for a PRACH transmission, in accordance with the present disclosure.
  • a network node may transmit, to a UE, a PDCCH order DCI.
  • the network node may transmit the PDCCH order DCI with a cyclic redundancy check (CRC) that is scrambled with a first RNTI or a second RNTI.
  • CRC cyclic redundancy check
  • the UE may use a first TCI state in a TCI codepoint.
  • the PDCCH order DCI is scrambled with the second RNTI
  • the UE may use a second TCI state in the TCI codepoint.
  • Fig. 6 is provided as an example. Other examples may differ from what is described with regard to Fig. 6.
  • Fig. 7 is a diagram illustrating an example process 700 performed, for example, at a UE or an apparatus of a UE, in accordance with the present disclosure.
  • Example process 700 is an example where the apparatus or the UE (e.g., UE 120) performs operations associated with selecting a TCI state for a PRACH transmission.
  • the apparatus or the UE e.g., UE 120
  • process 700 may include receiving a TCI activation MAC-CE (block 710) .
  • the UE e.g., using reception component 802 and/or communication manager 806, depicted in Fig. 8 may receive a TCI activation MAC-CE, as described above.
  • process 700 may include selecting a TCI codepoint based at least in part on the TCI activation MAC-CE (block 720) .
  • the UE e.g., using communication manager 806, depicted in Fig. 8
  • process 700 may include selecting a TCI state in the TCI codepoint (block 730) .
  • the UE e.g., using communication manager 806, depicted in Fig. 8 may select a TCI state in the TCI codepoint, as described above.
  • process 700 may include transmitting a PDCCH ordered PRACH transmission based at least in part on the TCI state (block 740) .
  • the UE e.g., using transmission component 804 and/or communication manager 806, depicted in Fig. 8
  • Process 700 may include additional aspects, such as any single aspect or any combination of aspects described below and/or in connection with one or more other processes described elsewhere herein.
  • the UE is associated with a single TRP or multiple TRPs.
  • process 700 includes selecting the TCI codepoint based at least in part on at least one of a default rule or a beam indication DCI.
  • process 700 includes applying the default rule based at least in part on the beam indication DCI not being received by the UE, or applying the default rule before applying the TCI state, wherein the TCI state is indicated from configured TCI states.
  • process 700 includes selecting a TCI codepoint with a lowest index among TCI codepoints activated by the TCI activation MAC-CE, in accordance with the default rule.
  • process 700 includes selecting a TCI codepoint with a lowest index among TCI codepoints activated by the TCI activation MAC-CE, in accordance with the default rule, wherein the TCI codepoint includes at least one joint TCI state or uplink TCI state.
  • process 700 includes selecting a TCI codepoint with a lowest index among TCI codepoints activated by the TCI activation MAC-CE, in accordance with the default rule, wherein the TCI codepoint includes two joint TCI states or two uplink TCI states.
  • process 700 includes receiving a PDCCH order DCI that includes an explicit indication, and selecting the TCI codepoint based at least in part on the explicit indication in the PDCCH order DCI, wherein the explicit indication is a field that indicates one or more activated TCI states corresponding to the TCI codepoint.
  • process 700 includes selecting the TCI state in the TCI codepoint based at least in part on a default rule, and the TCI state includes one or more of a first TCI state or a second TCI state.
  • process 700 includes applying the first TCI state in the TCI codepoint, in accordance with the default rule.
  • process 700 includes applying the second TCI state in the TCI codepoint, in accordance with the default rule.
  • process 700 includes applying the TCI state, which is associated with a pathloss offset in the TCI codepoint, in accordance with the default rule.
  • process 700 includes applying the first TCI state and the second TCI state in the TCI codepoint based at least in part on a PRACH repetition for multiple TRPs, in accordance with the default rule.
  • process 700 includes applying the first TCI state in the TCI codepoint when a PDCCH order DCI is scrambled with a first RNTI and the second TCI state in the TCI codepoint when the PDCCH order DCI is scrambled with a second RNTI, in accordance with the default rule.
  • process 700 includes applying the first TCI state in the TCI codepoint when a PDCCH order DCI is transmitted in odd slot, subframe, or system frame numbers and the second TCI state in the TCI codepoint when the PDCCH order DCI is transmitted in even slot, subframe, or system frame numbers, in accordance with the default rule.
  • process 700 includes receiving a PDCCH order DCI that includes an explicit indication, and selecting the TCI state in the TCI codepoint based at least in part on the explicit indication included in the PDCCH order DCI.
  • the explicit indication is associated with a TCI state selection field in the PDCCH order DCI, and the explicit indication is a two-bit field that indicates the TCI state in the TCI codepoint to be used.
  • the UE is associated with an uplink dense environment in which an uplink TRP is different than a downlink TRP.
  • process 700 may include additional blocks, fewer blocks, different blocks, or differently arranged blocks than those depicted in Fig. 7. Additionally, or alternatively, two or more of the blocks of process 700 may be performed in parallel.
  • Fig. 8 is a diagram of an example apparatus 800 for wireless communication, in accordance with the present disclosure.
  • the apparatus 800 may be a UE, or a UE may include the apparatus 800.
  • the apparatus 800 includes a reception component 802, a transmission component 804, and/or a communication manager 806, which may be in communication with one another (for example, via one or more buses and/or one or more other components) .
  • the communication manager 806 is the communication manager 140 described in connection with Fig. 1.
  • the apparatus 800 may communicate with another apparatus 808, such as a UE or a network node (such as a CU, a DU, an RU, or a base station) , using the reception component 802 and the transmission component 804.
  • another apparatus 808 such as a UE or a network node (such as a CU, a DU, an RU, or a base station) , using the reception component 802 and the transmission component 804.
  • the apparatus 800 may be configured to perform one or more operations described herein in connection with Figs. 5-6. Additionally, or alternatively, the apparatus 800 may be configured to perform one or more processes described herein, such as process 700 of Fig. 7, or a combination thereof.
  • the apparatus 800 and/or one or more components shown in Fig. 8 may include one or more components of the UE described in connection with Fig. 2. Additionally, or alternatively, one or more components shown in Fig. 8 may be implemented within one or more components described in connection with Fig. 2. Additionally, or alternatively, one or more components of the set of components may be implemented at least in part as software stored in 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.
  • the reception component 802 may receive communications, such as reference signals, control information, data communications, or a combination thereof, from the apparatus 808.
  • the reception component 802 may provide received communications to one or more other components of the apparatus 800.
  • the reception component 802 may perform signal processing on the received communications (such as filtering, amplification, demodulation, analog-to-digital conversion, demultiplexing, deinterleaving, de-mapping, equalization, interference cancellation, or decoding, among other examples) , and may provide the processed signals to the one or more other components of the apparatus 800.
  • the reception component 802 may include one or more antennas, one or more modems, one or more demodulators, one or more MIMO detectors, one or more receive processors, one or more controllers/processors, one or more memories, or a combination thereof, of the UE described in connection with Fig. 2.
  • the transmission component 804 may transmit communications, such as reference signals, control information, data communications, or a combination thereof, to the apparatus 808.
  • one or more other components of the apparatus 800 may generate communications and may provide the generated communications to the transmission component 804 for transmission to the apparatus 808.
  • the transmission component 804 may perform signal processing on the generated communications (such as filtering, amplification, modulation, digital-to-analog conversion, multiplexing, interleaving, mapping, or encoding, among other examples) , and may transmit the processed signals to the apparatus 808.
  • the transmission component 804 may include one or more antennas, one or more modems, one or more modulators, one or more transmit MIMO processors, one or more transmit processors, one or more controllers/processors, one or more memories, or a combination thereof, of the UE described in connection with Fig. 2. In some aspects, the transmission component 804 may be co-located with the reception component 802 in one or more transceivers.
  • the communication manager 806 may support operations of the reception component 802 and/or the transmission component 804. For example, the communication manager 806 may receive information associated with configuring reception of communications by the reception component 802 and/or transmission of communications by the transmission component 804. Additionally, or alternatively, the communication manager 806 may generate and/or provide control information to the reception component 802 and/or the transmission component 804 to control reception and/or transmission of communications.
  • the reception component 802 may receive a TCI activation MAC-CE.
  • the communication manager 806 may select a TCI codepoint based at least in part on the TCI activation MAC-CE.
  • the communication manager 806 may select a TCI state in the TCI codepoint.
  • the transmission component 804 may transmit a PDCCH ordered PRACH transmission based at least in part on the TCI state.
  • Fig. 8 The number and arrangement of components shown in Fig. 8 are provided as an example. In practice, there may be additional components, fewer components, different components, or differently arranged components than those shown in Fig. 8. Furthermore, two or more components shown in Fig. 8 may be implemented within a single component, or a single component shown in Fig. 8 may be implemented as multiple, distributed components. Additionally, or alternatively, a set of (one or more) components shown in Fig. 8 may perform one or more functions described as being performed by another set of components shown in Fig. 8.
  • a method of wireless communication performed by a user equipment comprising: receiving a transmission configuration indication (TCI) activation medium access control control element (MAC-CE) ; selecting a TCI codepoint based at least in part on the TCI activation MAC-CE; selecting a TCI state in the TCI codepoint; and transmitting a physical downlink control channel (PDCCH) ordered physical random access channel (PRACH) transmission based at least in part on the TCI state.
  • TCI transmission configuration indication
  • MAC-CE medium access control control element
  • PDCCH physical downlink control channel
  • PRACH physical random access channel
  • Aspect 2 The method of Aspect 1, wherein the UE is associated with a single transmission-reception point (TRP) or multiple TRPs.
  • TRP transmission-reception point
  • Aspect 3 The method of any of Aspects 1-2, wherein selecting the TCI codepoint is based at least in part on at least one of a default rule or a beam indication downlink control information (DCI) .
  • DCI downlink control information
  • Aspect 4 The method of Aspect 3, further comprising: applying the default rule based at least in part on the beam indication DCI not being received by the UE; or applying the default rule before applying the TCI state, wherein the TCI state is indicated from configured TCI states.
  • Aspect 5 The method of Aspect 3, wherein selecting the TCI codepoint comprises: selecting a TCI codepoint with a lowest index among TCI codepoints activated by the TCI activation MAC-CE, in accordance with the default rule.
  • Aspect 6 The method of Aspect 3, wherein selecting the TCI codepoint comprises: selecting a TCI codepoint with a lowest index among TCI codepoints activated by the TCI activation MAC-CE, in accordance with the default rule, wherein the TCI codepoint includes at least one joint TCI state or uplink TCI state.
  • Aspect 7 The method of Aspect 3, wherein selecting the TCI codepoint comprises: selecting a TCI codepoint with a lowest index among TCI codepoints activated by the TCI activation MAC-CE, in accordance with the default rule, wherein the TCI codepoint includes two joint TCI states or two uplink TCI states.
  • Aspect 8 The method of any of Aspects 1-7, further comprising: receiving a PDCCH order downlink control information (DCI) that includes an explicit indication, wherein selecting the TCI codepoint is based at least in part on the explicit indication in the PDCCH order DCI, and the explicit indication is a field that indicates one or more activated TCI states corresponding to the TCI codepoint.
  • DCI PDCCH order downlink control information
  • Aspect 9 The method of any of Aspects 1-8, wherein selecting the TCI state in the TCI codepoint is based at least in part on a default rule, and the TCI state includes one or more of a first TCI state or a second TCI state.
  • Aspect 10 The method of Aspect 9, wherein selecting the TCI state comprises: applying the first TCI state in the TCI codepoint, in accordance with the default rule.
  • Aspect 11 The method of Aspect 9, wherein selecting the TCI state comprises: applying the second TCI state in the TCI codepoint, in accordance with the default rule.
  • Aspect 12 The method of Aspect 9, wherein selecting the TCI state comprises: applying the TCI state, which is associated with a pathloss offset in the TCI codepoint, in accordance with the default rule.
  • Aspect 13 The method of Aspect 9, wherein selecting the TCI state comprises: applying the first TCI state and the second TCI state in the TCI codepoint based at least in part on a PRACH repetition for multiple transmission-reception points (TRPs) , in accordance with the default rule.
  • TRPs transmission-reception points
  • Aspect 14 The method of Aspect 9, wherein selecting the TCI state comprises: applying the first TCI state in the TCI codepoint when a PDCCH order downlink control information (DCI) is scrambled with a first radio network temporary identifier (RNTI) and the second TCI state in the TCI codepoint when the PDCCH order DCI is scrambled with a second RNTI, in accordance with the default rule.
  • DCI downlink control information
  • RNTI radio network temporary identifier
  • Aspect 15 The method of Aspect 9, wherein selecting the TCI state comprises: applying the first TCI state in the TCI codepoint when a PDCCH order downlink control information (DCI) is transmitted in odd slot, subframe, or system frame numbers and the second TCI state in the TCI codepoint when the PDCCH order DCI is transmitted in even slot, subframe, or system frame numbers, in accordance with the default rule.
  • DCI downlink control information
  • Aspect 16 The method of any of Aspects 1-15, further comprising: receiving a PDCCH order downlink control information (DCI) that includes an explicit indication, wherein selecting the TCI state in the TCI codepoint is based at least in part on the explicit indication included in the PDCCH order DCI.
  • DCI downlink control information
  • Aspect 17 The method of Aspect 16, wherein the explicit indication is associated with a TCI state selection field in the PDCCH order DCI, and the explicit indication is a two-bit field that indicates the TCI state in the TCI codepoint to be used.
  • Aspect 18 The method of any of Aspects 1-17, wherein the UE is associated with an uplink dense environment in which an uplink transmission-reception point (TRP) is different than a downlink TRP.
  • TRP transmission-reception point
  • Aspect 19 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 1-18.
  • Aspect 20 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 1-18.
  • Aspect 21 An apparatus for wireless communication, the apparatus comprising at least one means for performing the method of one or more of Aspects 1-18.
  • Aspect 22 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 1-18.
  • Aspect 23 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 1-18.
  • a device for wireless communication 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 1-18.
  • Aspect 25 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 1-18.
  • the term “component” is intended to be broadly construed as hardware or a combination of hardware and at least one of software or firmware.
  • “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.
  • a “processor” is implemented in hardware or a combination of hardware and software. 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.
  • 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.
  • a phrase referring to “at least one of” a list of items refers to any combination of those items, including single members.
  • “at least one of: a, b, or c” is intended to cover a, b, c, a + b, a + c, b + c, and a + b + c, as well as any combination with multiples of the same element (for example, a + a, a + a + a, a + a + b, a + a + c, a + b + b, a + c + c, b + b, b + b + b, b + b + c, c + c, or any other ordering of a, b, and c) .
  • the terms “has, ” “have, ” “having, ” and similar terms are intended to be open-ended terms that do not limit an element that they modify (for example, an element “having” A may also have B) .
  • the phrase “based on” is intended to mean “based on or otherwise in association with” unless explicitly stated otherwise.
  • the term “or” is intended to be inclusive when used in a series and may be used interchangeably with “and/or, ” unless explicitly stated otherwise (for example, if used in combination with “either” or “only one of” ) . It should be understood that “one or more” is equivalent to “at least one. ”

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

Divers aspects de la présente divulgation se rapportent, de façon générale, à une communication sans fil. Selon certains aspects, un équipement utilisateur (UE) peut recevoir un élément de commande d'accès au support d'activation (MAC-CE) d'indication de configuration de transmission (TCI). L'UE peut sélectionner un point de code TCI sur la base au moins en partie du MAC-CE d'activation de TCI. L'UE peut sélectionner un état TCI dans le point de code TCI. L'UE peut transmettre une transmission de canal physique d'accès aléatoire (PRACH) commandée par un canal physique de commande de liaison descendante (PDCCH) sur la base au moins en partie de l'état TCI. De nombreux autres aspects sont décrits.
PCT/CN2024/089242 2024-04-23 2024-04-23 Sélection d'un état d'indication de configuration de transmission pour une transmission de canal physique d'accès aléatoire Pending WO2025222361A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PCT/CN2024/089242 WO2025222361A1 (fr) 2024-04-23 2024-04-23 Sélection d'un état d'indication de configuration de transmission pour une transmission de canal physique d'accès aléatoire

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/CN2024/089242 WO2025222361A1 (fr) 2024-04-23 2024-04-23 Sélection d'un état d'indication de configuration de transmission pour une transmission de canal physique d'accès aléatoire

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Citations (4)

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CN115516965A (zh) * 2020-04-23 2022-12-23 三星电子株式会社 用于动态波束指示机制的方法和装置
US20230292335A1 (en) * 2021-01-12 2023-09-14 Ofinno, Llc Common Beam Indication Based on Link Selection
US20230379843A1 (en) * 2020-10-08 2023-11-23 Lg Electronics Inc. Method for reporting power headroom in wireless communication system and device therefor
US20240015793A1 (en) * 2021-03-30 2024-01-11 Apple Inc. Physical downlink control channel (pdcch) ordered neighbor cell physical random access channel (prach) and beam group based timing

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115516965A (zh) * 2020-04-23 2022-12-23 三星电子株式会社 用于动态波束指示机制的方法和装置
US20230379843A1 (en) * 2020-10-08 2023-11-23 Lg Electronics Inc. Method for reporting power headroom in wireless communication system and device therefor
US20230292335A1 (en) * 2021-01-12 2023-09-14 Ofinno, Llc Common Beam Indication Based on Link Selection
US20240015793A1 (en) * 2021-03-30 2024-01-11 Apple Inc. Physical downlink control channel (pdcch) ordered neighbor cell physical random access channel (prach) and beam group based timing

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