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WO2025199846A1 - Sélection de port dynamique pour synchronisation temporelle et de phase pour transmission conjointe cohérente - Google Patents

Sélection de port dynamique pour synchronisation temporelle et de phase pour transmission conjointe cohérente

Info

Publication number
WO2025199846A1
WO2025199846A1 PCT/CN2024/084294 CN2024084294W WO2025199846A1 WO 2025199846 A1 WO2025199846 A1 WO 2025199846A1 CN 2024084294 W CN2024084294 W CN 2024084294W WO 2025199846 A1 WO2025199846 A1 WO 2025199846A1
Authority
WO
WIPO (PCT)
Prior art keywords
csi
srs
trp
resources
resource
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/CN2024/084294
Other languages
English (en)
Inventor
Shaozhen GUO
Mostafa KHOSHNEVISAN
Jing Dai
Xiaoxia Zhang
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/CN2024/084294 priority Critical patent/WO2025199846A1/fr
Publication of WO2025199846A1 publication Critical patent/WO2025199846A1/fr
Pending legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/0001—Arrangements for dividing the transmission path
    • H04L5/0014—Three-dimensional division
    • H04L5/0023—Time-frequency-space

Definitions

  • aspects of the present disclosure generally relate to wireless communication and specifically relate to techniques, apparatuses, and methods for dynamic port selection for time and phase synchronization for coherent joint transmission.
  • 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
  • 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
  • the method may include transmitting one or more sounding reference signals (SRSs) using M SRS ports that are configured from multiple antenna ports, M being a first integer.
  • the method may include receiving multiple channel state information reference signals (CSI-RSs) from N CSI-RS resource sets, N being a second integer, each respective CSI-RS resource set of the N CSI-RS resource sets including M respective CSI-RS resources, the receiving being based at least in part on at least one of: a first operating condition that specifies to use at least a same set of antenna ports, from the multiple antenna ports, to receive at least a first CSI-RS of the multiple CSI-RSs using the M respective CSI-RS resources of a first CSI-RS resource set of the N CSI-RS resource sets and a second CSI-RS of the multiple CSI-RSs using the M respective CSI-RS resources of a second CSI-RS resource set of the N CSI-RS resource sets, or
  • the method may include receiving an SRS from a UE.
  • the method may include transmitting a CSI-RS that is based at least in part on a CSI-RS resource set that includes one or more CSI-RS resources, the CSI-RS including precoding that is based at least in part on the SRS.
  • the method may include receiving an indication of a time offset and a phase offset between the first TRP and a second TRP.
  • the apparatus may include one or more memories and one or more processors coupled to the one or more memories.
  • the one or more processors may be configured to transmit one or more SRSs using M SRS ports that are configured from multiple antenna ports, M being a first integer.
  • the one or more processors may be configured to receive multiple CSI-RSs from N CSI-RS resource sets, N being a second integer, each respective CSI-RS resource set of the N CSI-RS resource sets including M respective CSI-RS resources.
  • the one or more processors may be configured to receive the multiple CSI-RSs based at least in part on at least one of: a first operating condition that specifies to use at least a same set of antenna ports, from the multiple antenna ports, to receive at least a first CSI-RS of the multiple CSI-RSs using the M respective CSI-RS resources of a first CSI-RS resource set of the N CSI-RS resource sets and a second CSI-RS of the multiple CSI-RSs using the M respective CSI-RS resources of a second CSI-RS resource set of the N CSI-RS resource sets, or a second operating condition that specifies to receive the M respective CSI-RS resources of each respective CSI-RS resource set of the N CSI-RS resource sets using each antenna port included in the M SRS ports that are used to transmit the one or more SRSs, each antenna port included in the M SRS ports being linked to M respective CSI-RS resources of the N C SI-RS resource sets.
  • the apparatus may include one or more memories and one or more processors coupled to the one or more memories.
  • the one or more processors may be configured to receive an SRS from a UE.
  • the one or more processors may be configured to transmit a CSI-RS that is based at least in part on a CSI-RS resource set that includes one or more CSI-RS resources, the CSI-RS including precoding that is based at least in part on the SRS.
  • the one or more processors may be configured to receive an indication of a time offset and a phase offset between the first TRP and a second TRP.
  • Some aspects described herein relate to a non-transitory computer-readable medium that stores a set of instructions for wireless communication by a UE.
  • the set of instructions when executed by one or more processors of the UE, may cause the UE to transmit one or more SRSs using M SRS ports that are configured from multiple antenna ports, M being a first integer.
  • the set of instructions when executed by one or more processors of the UE, may cause the UE to receive multiple CSI-RSs from N CSI-RS resource sets, N being a second integer, each respective CSI-RS resource set of the N CSI-RS resource sets including M respective CSI-RS resources.
  • the set of instructions when executed by one or more processors of the UE, may cause the UE to receive the multiple CSI-RSs based at least in part on at least one of: a first operating condition that specifies to use at least a same set of antenna ports, from the multiple antenna ports, to receive at least a first CSI-RS of the multiple CSI-RSs using the M respective CSI-RS resources of a first CSI-RS resource set of the N CSI-RS resource sets and a second CSI-RS of the multiple CSI-RSs using the M respective CSI-RS resources of a second CSI-RS resource set of the N CSI-RS resource sets, or a second operating condition that specifies to receive the M respective CSI-RS resources of each respective CSI-RS resource set of the N CSI-RS resource sets using each antenna port included in the M SRS ports that are used to transmit the one or more SRSs, each antenna port included in the M SRS ports being linked to M respective CSI-RS resources of the N CSI-RS resource sets.
  • Some aspects described herein relate to a non-transitory computer-readable medium that stores a set of instructions for wireless communication by an one or more instructions that, when executed by one or more processors of a first TRP, may cause the first TRP to receive an SRS from a UE.
  • the set of instructions when executed by one or more processors of the first TRP, may cause the first TRP to transmit a CSI-RS that is based at least in part on a CSI-RS resource set that includes one or more CSI-RS resources, the CSI-RS including precoding that is based at least in part on the SRS.
  • the set of instructions when executed by one or more processors of the first TRP, may cause first TRP to receive an indication of a time offset and a phase offset between the first TRP and a second TRP.
  • the apparatus may include means for transmitting one or more SRSs using M SRS ports that are configured from multiple antenna ports, M being a first integer.
  • the apparatus may include means for receiving multiple CSI-RSs from N CSI-RS resource sets, N being a second integer, each respective CSI-RS resource set of the N CSI-RS resource sets including M respective CSI-RS resources, the receiving being based at least in part on at least one of: a first operating condition that specifies to use at least a same set of antenna ports, from the multiple antenna ports, to receive at least a first CSI-RS of the multiple CSI-RSs using the M respective CSI-RS resources of a first CSI-RS resource set of the N CSI-RS resource sets and a second CSI-RS of the multiple CSI-RSs using the M respective CSI-RS resources of a second CSI-RS resource set of the N CSI-RS resource sets, or a second operating condition that specifies to receive the M respective CSI-RS resources of
  • the apparatus may include means for receiving an SRS from a UE.
  • the apparatus may include means for transmitting a CSI-RS that is based at least in part on a CSI-RS resource set that includes one or more CSI-RS resources, the CSI-RS including precoding that is based at least in part on the SRS.
  • the apparatus may include means for receiving an indication of a time offset and a phase offset between the first TRP and a second TRP.
  • 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 communication network in accordance with the present disclosure.
  • Fig. 2 is a diagram illustrating an example network node in communication with an example 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. 6 is a diagram illustrating an example of a wireless communication process between a UE, a first TRP, and a second TRP, in accordance with the present disclosure.
  • Fig. 8 is a diagram illustrating an example of linkages between channel state information reference signal (CSI-RS) resource sets and a sounding reference signal (SRS) resource set, in accordance with the present disclosure.
  • CSI-RS channel state information reference signal
  • SRS sounding reference signal
  • Figs. 10A and 10B are diagrams illustrating a first example and a second example, respectively, of indicating a linkage between a CSI-RS resource and an SRS port, in accordance with the present disclosure.
  • Fig. 12 is a diagram illustrating an example process performed, for example, at a UE or an apparatus of a UE, in accordance with the present disclosure.
  • Fig. 13 is a diagram illustrating an example process performed, for example, at a first TRP or an apparatus of a first TRP, in accordance with the present disclosure.
  • Fig. 14 is a diagram of an example apparatus for wireless communication, in accordance with the present disclosure.
  • Fig. 15 is a diagram of an example apparatus for wireless communication, in accordance with the present disclosure.
  • multiple transmit-receive points may transmit data to, and/or receive data from, a user equipment (UE) in a synchronized and/or coherent manner.
  • a first TRP and a second TRP may phase align and/or time align respective transmissions to arrive at the UE in phase with one another to improve constructive interference and, consequently, improve a received signal quality (e.g., a higher power level) at the UE.
  • the first TRP and the second TRP may generate a joint transmission that combines a first signal from the first TRP and a second signal from the second TRP, resulting in a combined signal that has a higher received signal power level at the UE relative to the individual received powers of the first signal and/or the second signal.
  • the TRPs may use information about the respective channel between each TRP and the UE in order to select transmission weights or other transmission parameters (e.g., a timing offset and/or a phase offset) that improve constructive interference and, consequently, improve the received signal quality.
  • a UE may be configured with multiple sounding reference signal (SRS) ports that are used to transmit multiple SRSs to multiple TRPs operating in a CJT manner.
  • Each TRP may be assigned a respective set of resources, such as respective channel state information reference signal (CSI-RS) resources, that are used by the TRP to transmit a respective CSI-RS to the UE.
  • CSI-RS channel state information reference signal
  • a first TRP may use a first set of CSI-RS resources that are included in a first C SI-RS resource set
  • a second TRP may use a second set of CSI-RS resources that are included in a second CSI-RS set.
  • Each TRP may apply precoding to respective portions of the CSI-RS that are carried by a respective CSI-RS resource to mitigate distortion in the respective portion of the CSI-RS that is based at least in part on channel propagation and/or channel phase.
  • the precoding may be based at least in part on a respective SRS that is transmitted by the UE using a respective SRS port.
  • each TRP may derive channel estimations using the respective SRS, and the precoding may be based at least in part on the channel estimations. Accordingly, the channel estimations may be based at least in part on one or more characteristics of the respective SRS port used to transmit the SRS.
  • the UE may receive a precoded CSI-RS portion (e.g., a precoded CSI-RS resource as described below) using a same antenna port that is included in an SRS port that was used to transmit the SRS associated with the precoding.
  • the UE may also receive the precoded CSI-RS portion using a different antenna port than the SRS port associated with the precoding.
  • a precoded CSI-RS portion that is received by the UE using a different antenna port than the SRS port used for the precoding may be referred to as a cross-link signal, as described below.
  • the UE may be unable to cancel out the cross-link signals, resulting in inter-TRP phase offset estimations and/or inter-TRP timing offset estimations that are inaccurate by an amount that leads to transmissions from a first TRP and a second TRP (e.g., CJT performed by the TRPs) being unsynchronized.
  • Unsynchronized transmissions between TRPs may result in reduced signal quality at the UE (e.g., a signal power level that satisfies a low power threshold) , increased data recovery errors, reduced data throughput, and/or increased data transfer latencies.
  • a UE may transmit one or more SRSs using M SRS ports that are configured from multiple antenna ports (M being a first integer) .
  • M being a first integer
  • the UE may receive multiple CSI-RSs using N CSI-RS resource sets (N being a second integer) .
  • N being a second integer
  • each respective CSI-RS resource set of the N CSI-RS resource sets may include M respective CSI-RS resources.
  • the UE may receive the multiple CSI-RS based at least in part on one or more operating conditions.
  • a first operating condition may specify for the UE to use at least a same set of antenna ports (e.g., from the multiple antenna ports) to receive at least a first CSI-RS (e.g., of the multiple CSI-RSs) using the M respective CSI-RS resources of a first CSI-RS resource set (e.g. from the N CSI-RS resource sets) and a second CSI-RS (e.g., of the multiple CSI-RSs) using the M respective CSI-RS resources of a second CSI-RS resource set (e.g., of the N CSI-RS resource sets) .
  • a first CSI-RS e.g., of the multiple CSI-RSs
  • M respective CSI-RS resources of a first CSI-RS resource set e.g. from the N CSI-RS resource sets
  • a second CSI-RS e.g., of the multiple CSI-RSs
  • a second operating condition may specify for the UE to receive the M respective CSI-RS resources of each respective CSI-RS resource set (e.g., of the N CSI-RS resource sets) using each antenna port included in the M SRS ports that are used to transmit the one or more SRSs.
  • each antenna port included in the M SRS ports may be linked to a respective CSI-RS resource of each CSI-RS resource set in the N CSI-RS resource sets.
  • the described techniques can be used to enable a UE (e.g., a UE 120) to cancel cross-link signals and/or Tx-Rx mismatches in computations used to estimate the inter-TRP phase offset and/or the inter-TRP timing offset, and improve an accuracy of an inter-TRP phase offset estimation and/or an inter-TRP timing estimation, as described below.
  • a UE e.g., a UE 120
  • the operating condition (s) may ensure that the UE receives precoded CSI-RS resources that belong to different CSI-RS resource sets but are associated with the same SRS port, thus enabling the UE to cancel cross-link signals.
  • Improving an accuracy of an inter-TRP phase offset estimation and/or an inter-TRP timing offset estimation may improve synchronization in CJT between TRPs (e.g., reduce a timing offset and/or reduce a phase offset) , resulting in an increased signal quality at the UE (e.g., a signal power level that satisfies a high power threshold) , reduced data recovery errors, increased data throughput, and/or decreased data transfer latencies.
  • 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.
  • 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.
  • 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 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.
  • 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 downlink control channel may be used to transmit downlink control information (DCI) (for example, scheduling information, reference signals, and/or configuration information) from a network node 110 to a UE 120.
  • DCI downlink control information
  • 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.
  • 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.
  • 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
  • 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
  • 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.
  • 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.
  • 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.
  • 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.
  • 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
  • Fig. 3 is provided as an example. Other examples may differ from what is described with regard to Fig. 3.
  • 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 dynamic port selection for time and phase synchronization for CJT, 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 1200 of Fig.
  • a TRP described herein is a network node 110, is included in the network node 110, or includes one or more components of the network node 110 shown in Fig. 2.
  • 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.
  • a UE (e.g., a UE 120) includes means for transmitting one or more SRSs using M SRS ports that are configured from multiple antenna ports, M being a first integer; and/or means for receiving multiple CSI-RSs from N CSI-RS resource sets, N being a second integer, each respective CSI-RS resource set of the N CSI-RS resource sets including M respective CSI-RS resources, the receiving being based at least in part on at least one of: a first operating condition that specifies to use at least a same set of antenna ports, from the multiple antenna ports, to receive at least a first CSI-RS of the multiple CSI-RSs using the M respective CSI-RS resources of a first CSI-RS resource set of the N CSI-RS resource sets and a second CSI-RS of the multiple CSI-RSs using the M respective CSI-RS resources of a second CSI-RS resource set of the N CSI-RS resource sets, or a second operating condition that specifies to receive the M respective CSI-
  • 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.
  • a first TRP (e.g., a network node 110) includes means for receiving an SRS from a UE; means for transmitting a CSI-RS that is based at least in part on a CSI-RS resource set that includes one or more CSI-RS resources, the CSI-RS including precoding that is based at least in part on the SRS; and/or means for receiving an indication of a time offset and a phase offset between the first TRP and a second TRP.
  • the means for the first TRP to perform operations described herein may include, for example, one or more of communication manager 150, transmit processor 214, TX MIMO processor 216, modem 232, antenna 234, MIMO detector 236, receive processor 238, controller/processor 240, memory 242, or scheduler 246.
  • first DCI (e.g., transmitted by the first TRP 505) may schedule a first PDSCH communication associated with a first set of DMRS ports with a first QCL relationship (e.g., indicated by a first TCI state) for the first TRP 505, and second DCI (e.g., transmitted by the second TRP 505) may schedule a second PDSCH communication associated with a second set of DMRS ports with a second QCL relationship (e.g., indicated by a second TCI state) for the second TRP 505.
  • DCI (e.g., having DCI format 1_0 or DCI format 1_1) may indicate a corresponding TCI state for a TRP 505 corresponding to the DCI.
  • the TCI field of a DCI indicates the corresponding TCI state (e.g., the TCI field of the first DCI indicates the first TCI state and the TCI field of the second DCI indicates the second TCI state) .
  • ⁇ Tx phase uncertainty that is introduced by a transmit-side clock jitter
  • ⁇ Rx represents a receiver timing offset (e.g., a receiver phase ramp over adjacent subcarriers that are separated by a frequency difference of ⁇ f) that is introduced by the clock jitter at a receiver device, where ⁇ Rx may include a “UE” , “TRP1” , and/or “TRP2” subscript to indicate the receiver device as used above and/or below.
  • ⁇ Tx represents a phase uncertainty introduced by a transmitter-side clock jitter, where ⁇ Tx may use a “UE” , “TRP1” , and/or “TRP2” subscript to identify the transmitter device, as used above and/or below.
  • the subscript TRP2 ⁇ UE [1] refers to a first SRS signal that was transmitted by the UE 702 via a first SRS port and is received by the second TRP 706, and the subscript TRP2 ⁇ UE [M] refers to an M-th SRS signal that was transmitted by the UE 702 via an M-th SRS port and is received by the second TRP 706.
  • the first TRP 704 may transmit, and the UE 702 may receive, a first CSI-RS that is based at least in part on M > 1 CSI-RS resources, and each portion of the first CSI-RS that is carried by a respective CSI-RS resource may be precoded based at least in part on a respective SRS and/or a respective SRS port.
  • the subscript UE [M] ⁇ TRP1 ⁇ UE [M] indicates that at least a portion of the CSI-RS is received by the UE 702 via an M-th antenna port (e.g., indicated by the leftmost UE [M] ) , that the CSI-RS was transmitted by the first TRP 704 (e.g., indicated by the TRP1) , and the first TRP 704 precoded the portion of the CSI-RS using an M-th SRS that was transmitted by the UE 702 via the M-th SRS port (e.g., indicated by the rightmost UE [M] ) .
  • the M-th antenna port may be a particular transceiver antenna port that is included in and/or used by the M-th SRS port.
  • the UE 702 may alternatively, or additionally, receive a portion of a CSI-RS using a different antenna port than the precoding associated with the portion of the CSI-RS.
  • the portion of the CSI-RS may be precoded based at least in part on an SRS port that includes a first antenna port, and the UE may receive the portion of the CSI-RS using a second antenna port that is not included in the SRS port, which may also be referred to as a cross-link signal and/or a transmit-receive (Tx-Rx) mismatch signal.
  • a cross-link signal may be represented as: y UE [M] ⁇ TRP1 ⁇ UE [1] ,
  • the subscript UE [M] ⁇ TRP1 ⁇ UE [1] indicates that a portion of CSI-RS that is received by the UE 702 via an M-th receive antenna port (e.g., indicated by UE [M] ) and was transmitted by the first TRP 704 (e.g., indicated by the TRP1) is precoded based at least in part on an SRS that is transmitted by the UE 702 using a first SRS port (e.g., indicated by UE [1] ) .
  • the combination of precoded CSI-RSs and receive antenna ports and/or transceiver antenna ports may be represented by the following matrix:
  • the second TRP 706 may transmit, and the UE 702 may receive, a second CSI-RS that is based at least part on M CSI-RS resources, where M > 1.
  • M M
  • Each portion of the CSI-RS that is carried by a respective CSI-RS resource may be precoded based at least in part on a respective SRS and/or a respective SRS port.
  • the second TRP 706 may precode a first portion of the CSI-RS that is carried by a first CSI-RS resource by applying precoding that is based at least in part on a phase conjugate of a first SRS received by the second TRP 704 (e.g., ) , and an M-th portion of the CSI-RS by applying precoding that is based at least in part on a phase conjugate of an M-th SRS received by the second TRP 706 (e.g., ) .
  • each antenna port of the UE 702 may receive at least a portion of the second CSI-RS that is transmitted by the second TRP 706, which may be represented as: y UE [1] ⁇ TRP2 ⁇ UE [1] , ..., y UE [M] ⁇ TRP2 ⁇ UE [M]
  • the subscript UE [1] ⁇ TRP2 ⁇ UE [1] indicates a first portion of a CSI-RS that is received by the UE 702 via a first antenna port (e.g., indicated by the leftmost UE [1] ) , that the first portion of the CSI-RS was transmitted by the second TRP 706 (e.g., indicated by TRP2) , and the second TRP 706 precoded the first portion of the CSI-RS based at least in part on a first SRS that was transmitted by the UE 702 using the first SRS port.
  • the UE 702 may receive a combination of precoded CSI-RSs via a combination of antenna ports, and the combination of precoded CSI-RSs and receive antenna ports (and/or transceiver antenna ports) may be represented by the following matrix:
  • the UE 702 may calculate a time offset (e.g., an inter-TRP time offset) and/or a phase offset (e.g., an inter-TRP phase offset) using the precoded CSI-RSs and/or the SRSs.
  • a time offset e.g., an inter-TRP time offset
  • a phase offset e.g., an inter-TRP phase offset
  • the UE 702 may calculate the time offset and/or the phase offset based at least in part on using the received signals described above (e.g., y UE [1] ⁇ TRP1 ⁇ UE [1] up to y UE [M] ⁇ TRP2 ⁇ UE [M] as indicated in the matrices above) to calculate an in-total A 2 received signal terms from each TRP and/or use the A 2 received signal terms to derive the inter-TRP timing offset ( ⁇ TRP2to1 ) and/or the inter-TRP phase offset ( ⁇ TRP2to1 ) .
  • the received signals described above e.g., y UE [1] ⁇ TRP1 ⁇ UE [1] up to y UE [M] ⁇ TRP2 ⁇ UE [M] as indicated in the matrices above
  • the UE 702 may transmit, and at least one of the first TRP 704 and/or the TRP 706 may receive, the time offset and/or the phase offset calculated as indicated by reference number 750.
  • the UE 702 may transmit the time offset and/or the phase offset in any combination of Layer 1 signaling (e.g., UCI) , Layer 2 signaling (e.g., a MAC CE) , and/or Layer 3 signaling (e.g., RRC signaling) .
  • Layer 1 signaling e.g., UCI
  • Layer 2 signaling e.g., a MAC CE
  • Layer 3 signaling e.g., RRC signaling
  • the second TRP 706 may synchronize to the first TRP 704.
  • the second TRP 706 may use the timing offset and/or the phase offset to adjust transmission of a first downlink signal by the second TRP 706 to improve synchronization (e.g., reduce a timing offset and/or reduce a phase offset) with a second downlink signal by the first TRP 704.
  • the first downlink signal and the second downlink signal may be part of a CJT that is directed to the UE 702.
  • the example 700 may be expanded such that, in other examples, one or more TRPs may include multiple antenna ports, and the mathematical representations and/or equations above may be expanded to apply to the TRPs with multiple antenna ports in to cancel out channel propagation delay and/or channel phase offsets to obtain inter-TRP time offsets and/or inter-TRP phase offsets.
  • Fig. 7 is provided as an example. Other examples may differ from what is described with regard to Fig. 7.
  • Fig. 8 is a diagram illustrating an example 800 of linkages between CSI-RS resource sets and an SRS resource set, in accordance with the present disclosure.
  • a UE may transmit multiple SRSs via multiple SRS ports, such as by transmitting multiple single SRS port transmissions and/or one or more multiple SRS port transmissions.
  • the UE may be configured with one SRS resource that includes M ports, or M single-port SRS resources that are each associated with a different SRS port.
  • M 2
  • the UE has been configured with an SRS resource set that includes a first SRS port 804-1 and a second SRS port 804-2 (each shown as a solid white disk) .
  • the UE may be configured to receive N CSI-RS resource sets, where N is an integer that represents a number of TRPs.
  • N 2 CSI-RS resource sets for two TRPs: a first CSI-RS resource set 806 that is associated with a first TRP (e.g., the first TRP 604 as described with regard to Fig. 6 and/or the first TRP 704 as described with regard to Fig. 7) and a second CSI-RS resource set 808 that is associated with a second TRP (e.g., the second TRP 606 as described with regard to Fig. 6 and/or the second TRP 706 as described with regard to Fig. 7) .
  • Each CSI-RS resource set may include at least M CSI-RS resources.
  • the first CSI-RS resource set 806 includes at least a first CSI-RS resource 810-1 and a second CSI-RS resource 810-2 (shown with a dotted pattern)
  • the second CSI-RS resource set 808 includes at least a first CSI-RS resource 812-1 and a second CSI-RS resource 812-2.
  • Each CSI-RS resource in a CSI-RS resource set may be linked to a respective SRS port of an SRS resource set (e.g., the SRS ports and/or SRS resources configured for the UE) .
  • “linked” may denote a CSI-RS resource (e.g., a time domain and frequency domain resource) that carries a signal (e.g., a CSI-RS) that is precoded based at least in part on an SRS port. That is, a linkage between a CSI-RS resource and an SRS port may indicate that an CSI-RS carried by the CSI-RS resource is precoded based at least in part on the linked SRS port.
  • a CSI-RS resource that is linked to an SRS may be precoded based at least on the phase of a received SRS signal that uses the SRS port and/or SRS resource.
  • the linkage may be indicated and/or configured by a network node (e.g., a network node 110) , such as by the network node indicating the linkage in RRC signaling.
  • the network may indicate the linkage between a CSI-RS resource and an SRS port in first RRC signaling that indicates a CSI-RS resource configuration and/or second RRC signaling that indicates an SRS resource configuration and/or an SRS port configuration.
  • the first CSI-RS resource 810-1 of the first CSI-RS resource set 806 is linked to the first SRS port 804-1 (shown with a dashed line)
  • the second CSI-RS resource 810-2 of the first CSI-RS resource set 806 is linked to the second SRS port 804-2 (shown with a solid line) .
  • the calculations described with regard to Fig. 6 and Fig. 7 are able to cancel out a channel delay and/or a channel phase based at least in part on each CSI-RS being precoded based at least in part on a particular SRS port used by the UE to transmit a particular SRS.
  • the calculations described with regard to Fig. 6 and Fig. 7 are able to cancel out a channel delay and/or a channel phase based at least in part on the UE using a particular receive antenna port to receive the precoded CSI-RS, such as a particular transceiver antenna port that is used in the particular SRS port for transmission of the particular SRS.
  • a UE may transmit a single port SRS.
  • the UE may use a same antenna port that is used for the single port SRS (e.g., a transceiver antenna port) to receive the corresponding pre-coded CSI-RS.
  • the UE may transmit multiple SRSs via multiple SRS ports, such as an SRS that is based at least in part on a multi-port SRS that uses more than one antenna port, and/or multiple SRSs that use, respectively, a respective (single) SRS port.
  • the UE may receive a precoded CSI-RS using a same antenna port (e.g., a transceiver antenna port) that is used in the SRS port associated with the precoding and/or may receive the precoded CSI-RS using a different antenna port (e.g., a different transceiver antenna port) than the SRS port associated with the precoding.
  • a precoded CSI-RS (and/or a portion of a CSI-RS that is precoded) that is received by the UE using a different antenna port than the SRS port used for the precoding may be referred to as a cross-link signal and/or a Tx-Rx mismatch as described above.
  • the UE may be unable to cancel out the cross-link signals and/or the Tx-Rx mismatches, resulting in inter-TRP phase offset estimations and/or inter-TRP timing offset estimations that are inaccurate by an amount that leads to transmissions from a first TRP and a second TRP (e.g., CJT by the TRPs) being unsynchronized.
  • Unsynchronized transmissions between TRPs may result in reduced signal quality at the UE (e.g., a signal power level that satisfies a low power threshold) , increased data recovery errors, reduced data throughput, and/or increased data transfer latencies.
  • a UE may transmit one or more SRSs using M SRS ports that are configured from multiple antenna ports (M being a first integer) .
  • the UE may receive multiple CSI-RSs using N CSI-RS resource sets (N being a second integer) .
  • each respective CSI-RS resource set of the N CSI-RS resource sets may include M respective CSI-RS resources.
  • the UE may receive the multiple CSI-RSs based at least in part on one or more operating conditions.
  • a first operating condition may specify for the UE to use at least a same set of antenna ports (e.g., from the multiple antenna ports) to receive at least a first CSI-RS (e.g., of the multiple CSI-RSs) using the M respective CSI-RS resources of a first CSI-RS resource set (e.g. from the N CSI-RS resource sets) and a second CSI-RS (e.g., of the multiple CSI-RSs) using the M respective CSI-RS resources of a second CSI-RS resource set (e.g., of the N CSI-RS resource sets) .
  • a first CSI-RS e.g., of the multiple CSI-RSs
  • M respective CSI-RS resources of a first CSI-RS resource set e.g. from the N CSI-RS resource sets
  • a second CSI-RS e.g., of the multiple CSI-RSs
  • a second operating condition may specify for the UE to receive the M respective CSI-RS resources of each respective CSI-RS resource set (e.g., of the N CSI-RS resource sets) using each antenna port included in the M SRS ports that are used to transmit the one or more SRSs.
  • each antenna port included in the M SRS ports may be linked to a respective CSI-RS resource of each CSI-RS resource set in the N C SI-RS resource sets.
  • Using one or more operating conditions that specify allowed and/or disallowed antenna ports for receiving precoded CSI-RSs may enable a UE (e.g., a UE 120) to cancel cross-link signals and/or Tx-Rx mismatches and improve an accuracy of an inter-TRP phase offset estimation and/or an inter-TRP timing estimation as described below.
  • a UE e.g., a UE 120
  • the operating condition (s) may ensure that the UE receives precoded CSI-RS resources that belong to different CSI-RS resource sets but are associated with the same SRS port (e.g., the first CSI-RS resource 810-1 of the first CSI-RS resource set 806 and the first CSI-RS resource 812-1 of the second CSI-RS resource set 808 that are associated with the first SRS port 804-1) using a same antenna port, thus enabling the UE to cancel cross-link signals.
  • the UE receives precoded CSI-RS resources that belong to different CSI-RS resource sets but are associated with the same SRS port (e.g., the first CSI-RS resource 810-1 of the first CSI-RS resource set 806 and the first CSI-RS resource 812-1 of the second CSI-RS resource set 808 that are associated with the first SRS port 804-1) using a same antenna port, thus enabling the UE to cancel cross-link signals.
  • Example operating conditions may include a first operating condition that specifies to use at least a same set of antenna ports, from multiple antenna ports at the UE, to receive at least a first CSI-RS of multiple CSI-RSs (e.g., using M respective CSI-RS resources of a first CSI-RS resource set associated with the first CSI-RS) and a second CSI-RS of the multiple CSI-RSs (e.g., using M respective CSI-RS resources of a second CSI-RS resource set of the N CSI-RS resource sets) and/or a second operating condition that specifies to receive M respective CSI-RS resources of each respective CSI-RS resource set (e.g., of multiple CSI-RS resource sets) using each antenna port of M SRS ports that are used to transmit one or more SRSs, where each antenna port included in the M SRS ports is linked to M respective CSI-RS resource of multiple CSI-RS resource sets.
  • a first operating condition that specifies to use at least a same set of antenna ports, from multiple
  • two SRSs received at a first TRP (e.g., the first TRP 604 and/or the first TRP 704) via a link with a UE (e.g., the UE 602 and/or the UE 702) may be represented as:
  • the network node may trigger and/or request a CSI report from the UE using a unicast DCI, and the CSI report may be associated with and/or based at least in part on multiple CSI-RS resource sets (e.g., a first CSI-RS resource set associated with a first TRP and a second CSI-RS resource set associated with a second TRP) .
  • multiple CSI-RS resource sets e.g., a first CSI-RS resource set associated with a first TRP and a second CSI-RS resource set associated with a second TRP
  • Each CSI-RS resource set may include multiple CSI-RS resources (e.g., M CSI-RS resources, where M is greater than 1) based at least in part on the UE being configured with multiple SRS ports (e.g., M SRS ports) , and each CSI-RS resource may be linked to a respective SRS port as described above (e.g., based at least in part on precoding) .
  • the network node may trigger the UE to generate the CSI-RS report using a respective subset of CSI-RS resources in each of the multiple CSI-RS resource sets using a field in the unicast DCI and/or codepoints.
  • each codepoint in a field of the unicast DCI may indicate a subset of the SRS ports (e.g., M′ SRS ports, where M′ is an integer that is less than or equal to M) .
  • the variety of codepoint configurations transmitted in RRC signaling may indicate multiple subsets of SRS ports and/or multiple combinations of subsets of SRS ports
  • the field in the unicast DCI may indicate selection of one of the multiple subsets of SRS ports and/or one of the multiple combinations of subsets of SRS ports.
  • the UE may generate the CSI-RS report by measuring, for each CSI-RS resource sets of the multiple CSI-RS resource sets, a subset of CSI-RS resources instead of an entirety of the CSI-RS resources. That is, the UE will measure the M′ CSI-RS resources using each CSI-RS resource that is associated with a respective SRS port in the subset of SRS ports indicated by the unicast DCI.
  • each TRP may not use the CSI-RS resources that are not linked to the subset of SRS ports and/or the UE may not receive and/or use signals on antenna ports that are not included in the subset of SRS ports.
  • each codepoint in a field of the unicast DCI may indicate and/or be mapped to a subset of the CSI-RS resources (e.g., M′ CSI-RS resources, where M′ is an integer that is less than or equal to M) .
  • the variety of codepoint configurations transmitted in RRC signaling may indicate multiple subsets of CSI-RS resources and/or multiple combinations of subsets of CSI-RS resources
  • the field in the unicast DCI may indicate selection of one of the multiple subsets of CSI-RS resources and/or one of the multiple combinations of subsets of CSI-RS resources.
  • the UE may generate the CSI-RS report by measuring, for each CSI-RS resource set of the multiple CSI-RS resource sets, a subset of CSI-RS resources instead of an entirety of the CSI-RS resources.
  • the UE may not receive and/or use signals on antenna ports that are not linked to the M′ CSI-RS resources and/or each TRP may not use the CSI-RS resources that are not indicated in subset of CSI-RS resources.
  • each operating condition may apply the subset of SRS ports (e.g., the M′ SRS ports) and/or the subset of CSI-RS resources (e.g., the M′ CSI-RS resources) in each CSI-RS resource set.
  • the first example 1000 shown by Fig. 10A includes a UE 1002 (e.g., a UE 120) that may include at least four antenna ports, shown in Fig. 10A as antenna port 1, antenna port 2, antenna port 3, and antenna port 4, which may be any combination of a transmit port, a receive port, and/or a transceiver port.
  • each SRS port shown by reference number 1004 is configured with a respective antenna port of the UE 120.
  • SRS 1 is configured with antenna port 1 (each shown with diagonal stripes)
  • SRS 2 is configured with antenna port 2 (each shown with horizontal stripes)
  • SRS 3 is configured with antenna port 3 (each shown with a dotted pattern)
  • SRS 4 is configured with antenna port 4 (each shown in solid white) .
  • the UE 1002 may communicate with multiple TRPs, such as by using CJT communications as described above.
  • the UE 1002 is in communication with four TRPs (not shown in Fig 10A) , and each TRP has been configured with a respective CSI-RS resource set: a first TRP is configured with a first CSI-RS resource set 1006-1, a second TRP is configured with a second CSI-RS resource set 1006-2, a third TRP is configured with a third CSI-RS resource set 1006-3, and a fourth TRP is configured with a fourth CSI-RS resource set 1006-4.
  • Each CSI-RS resource set may include at least four CSI-RS resources (shown as circles within each CSI-RS resource set) based at least in part on the UE 1002 being configured with four SRS ports.
  • the first CSI-RS resource set 1006-1 includes a CSI-RS resource 1008-1
  • the second CSI-RS resource set 1006-2 includes a CSI-RS resource 1008-2
  • the third CSI-RS resource set 1006-3 includes a CSI-RS resource 1008-3
  • the fourth CSI-RS resource set 1006-4 includes a CSI-RS resource 1008-4.
  • Each CSI-RS resource of a respective CSI-RS resource set may be linked to a respective SRS port of the UE 1002 as indicated by the key and through the use of a same pattern.
  • the CSI-RS resource 1008-1 of the first CSI-RS resource set 1006-1 may be linked to the third SRS port (e.g., SRS 3) as indicated by the dotted pattern used in Fig. 10A for each, and the CSI-RS resource 1008-4 of the fourth CSI-RS resource set 1006-4 may also be linked to the third SRS port (e.g., SRS 3) as also indicated by the dotted pattern used in Fig. 10A for each.
  • the UE 1002 uses a same antenna port to receive the selected CSI-RS resources.
  • a network node may indicate to generate a CSI-RS report 1010 that is based at least in part on a subset of SRS ports. For example, the network node may indicate selection of a particular entry in a codepoint as shown by reference number 1012.
  • the second example 1050 shown by Fig. 10B includes the UE 1002 (described with regard to Fig. 10 A) , and the UE 1002 is configured with the four SRS ports described with regard to Fig. 10A.
  • the UE 1002 is in communication with four TRPs (not shown in Fig. 10B) , and each TRP has been configured with M respective CSI-RS resource sets.
  • Each CSI-RS resource set may include at least four CSI-RS resources, such as the CSI-RS resource 1008-1 in the first CSI-RS resource set 1006-1, the CSI-RS resource 1008-2 in the second CSI-RS resource set 1006-2, the CSI-RS resource 1008-3 in the third CSI-RS resource set 1006-3, and the CSI-RS resource 1008-4 in the fourth CSI-RS resource set 1006-4.
  • Each CSI-RS resource of a respective CSI-RS resource set may be linked to a respective SRS port of the UE 1002 as indicated by the key and through the use of a same pattern.
  • the network node may indicate to generate a second CSI-RS report 1052 that is based at least in part on a different subset of SRS ports relative to the first CSI-RS report 1010.
  • the network node may indicate selection of a particular entry in a codepoint as shown by reference number 1054. Accordingly, each TRP may transmit a subset of CSI-RS resources (shown in Fig.
  • subset 1054-1, subset 1054-2, subset 1054-3, and subset 1054-4) and/or the UE 1002 may receive a subset of CSI-RS resources, as shown by reference number 1056, using the antenna ports that are linked to the selected CSI-RS resources (e.g., via SRS transmission using a linked SRS port) .
  • Figs. 10A and 10B are provided as examples. Other examples may differ from what is described with regard to Figs. 10A and 10B.
  • Fig. 11 is a diagram illustrating an example 1100 of a wireless communication process between a UE 1102 (e.g., a UE 120) , a first network node 1104 (e.g., a first network node 110 and/or a first TRP) , and a second network node 1106 (e.g., a second network node 110 and/or a second TRP) , in accordance with the present disclosure.
  • a UE 1102 e.g., a UE 120
  • a first network node 1104 e.g., a first network node 110 and/or a first TRP
  • a second network node 1106 e.g., a second network node 110 and/or a second TRP
  • a first network node 1104 and a second network node 1106 may establish a connection with a UE 1102.
  • the first network node 1104 and the second network node 1106 may establish a connection with the UE 1102 based at least in part on CJT between the first network node 1104 and the second network node 1106.
  • the UE 1102 may power up in a cell coverage area that is jointly provided by the first network node 1104 and the second network node 1106 (e.g., via CJT) , and the UE 1102, the first network node 1104, and the second network node 1106 may perform one or more procedures (e.g., a random access channel (RACH) procedure and/or an RRC procedure) to establish a wireless connection.
  • the UE 1102 may move into the cell coverage area jointly provided by the first network node 1104 and the second network node 1106 and may perform a handover from a source network node (e.g., another network node 110) to at least one of the first network node 1104 and the second network node 1106.
  • a source network node e.g., another network node 110
  • the first network node 1104 and the second network node 1106 may communicate with the UE 1102 via the connection based at least in part on any combination of Layer 1 signaling (e.g., DCI and/UCI) , Layer 2 signaling (e.g., a MAC CE) , and/or Layer 3 signaling (e.g., RRC signaling) .
  • Layer 1 signaling e.g., DCI and/UCI
  • Layer 2 signaling e.g., a MAC CE
  • Layer 3 signaling e.g., RRC signaling
  • the first network node 1104 and the second network node 1106 may request, via RRC signaling, UE capability information and/or the UE 1102 may transmit, via RRC signaling, the UE capability information.
  • the first network node 1104 and the second network node 1106 may transmit configuration information via Layer 3 signaling (e.g., RRC signaling) , and activate and/or deactivate a particular configuration via Layer 2 signaling (e.g., a MAC CE) and/or Layer 1 signaling (e.g., DCI) .
  • Layer 3 signaling e.g., RRC signaling
  • Layer 2 signaling e.g., a MAC CE
  • Layer 1 signaling e.g., DCI
  • the first network node 1104 and/or the second network node 1106 may transmit, and the UE 1102 may receive, configuration information.
  • Fig. 11 illustrates the first network node 1104 and the second network node 1106 transmitting the configuration information separately from establishing the connection with the UE 1102, but in other examples, the first network node 1104 and the second network node 1106 may transmit the configuration as part of establishing the connection as described above.
  • the first network node 1104 and/or the second network node 1106 may indicate configuration information in any combination of Layer 1 signaling, Layer 2 signaling, and/or Layer 3 signaling.
  • the first network node 1104 and/or the second network node 1106 may transmit, and the UE 1102 may receive, a CSI report request.
  • the first network node 1104 and the second network node 1106 may transmit the request using CJT.
  • the first network node 1104 and/or the second network node 1106 may transmit an indication to transmit a CSI report that is based at least in part on a respective subset of CSI-RS resources of the M respective CSI-RS resources in the CSI-RS resource set.
  • the first network node 1104 and/or the second network node 1106 may indicate the respective subset of CSI-RS resources in a unicast DCI field as described with regard to Figs.
  • the UE 1102 may receive each respective CSI-RS using each respective CSI-RS resource set associated with the first network node 1104 and the second network node 1106 (e.g., the N CSI-RS resource sets) .
  • the UE 1102 may receive each respective CSI-RS using a respective subset of CSI-RS resources in each respective CSI-RS resource set as described with regard to Figs. 10A and 10B.
  • the UE 1102 may receive the CSI-RS (s) based at least in part on one or more operating conditions, such as one or more operating conditions that may be specified by a communication standard.
  • a first example operating condition may include an operating condition that specifies to use at least a same set of antenna ports to receive at least a first CSI-RS using the M respective CSI-RS resources of a first CSI-RS resource set (and/or a portion of the first CSI-RS using a subset of CSI-RS resources in a first CSI-RS resource set) and a second CSI-RS of the multiple CSI-RSs using the M respective CSI-RS resources of a second CSI-RS resource set (and/or a portion of the second CSI-RS using a subset of CSI-RS resources in a second CSI-RS resource set) .
  • the first operating condition may alternatively or additionally specify to not use different sets of antenna ports of the multiple antenna ports to receive the first CSI-RS resource set and the second CSI-RS resource set, such as that described with regard to Fig. 9D.
  • a second example operating condition may include an operating condition that specifies to receive the M respective CSI-RS resources of each respective CSI-RS resource set (and/or a respective subset of CSI-RS resources of each respective CSI-RS resource set) using each antenna port included in the M SRS ports that are used to transmit the one or more SRSs (and/or a subset of SRS ports from the M SRS ports) based at least in part on a linkage between the M SRS ports and M respective CSI-RS resource of the M CSI-RS resources in each respective CSI-RS resource set.
  • a respective portion of the CSI-RS (e.g., a portion that is carried by a respective CSI-RS resource) may be precoded based at least in part on a respective SRS that is transmitted via a respective SRS port of the M SRS ports.
  • each respective antenna port of the M SRS ports may be linked to a respective CSI-RS resource of the M CSI-RS resources of each respective CSI-RS resource set of the N CSI-RS resource set, and a respective portion of a CSI-RS that is carried by the respective CSI-RS resource may be precoded based at least in part on a respective SRS that is transmitted via the respective (linked) SRS port.
  • the UE 1102 may calculate a phase offset and/or a timing offset.
  • the UE 1102 may calculate an inter-TRP phase offset and/or an inter-TRP timing offset as described with regard to Fig. 6, Fig. 7, and Fig. 8 based at least in part on satisfying a first operating condition and/or a second operating condition as described with regard to reference number 1150.
  • the UE 1102 may not use a portion of the CSI-RS (s) that are received via one or more antennas that are not included in the M SRS ports.
  • Using one or more operating conditions that specify allowed and/or disallowed antenna ports for receiving precoded CSI-RSs may enable a UE (e.g., a UE 120) to cancel cross-link signals and/or Tx-Rx mismatches and improve an accuracy of an inter-TRP phase offset estimation and/or an inter-TRP timing estimation as described above. That is, the operating condition (s) may ensure that the UE receives precoded CSI-RS resources that belong to different CSI-RS resource sets but are associated with the same SRS port using a same antenna port, thus enabling the UE to cancel cross-link signals in computations associated with estimating the inter-TRP phase offset and/or the inter-TRP timing.
  • Improving an accuracy of an inter-TRP phase offset estimation and/or an inter-TRP timing offset estimation may improve synchronization in CJT between TRPs (e.g., reduce a timing offset and/or reduce a phase offset) , resulting in an increased signal quality at the UE (e.g., a signal power level that satisfies a high power threshold) , reduced data recovery errors, increased data throughput, and/or decreased data transfer latencies.
  • Fig. 11 is provided as an example. Other examples may differ from what is described with regard to Fig. 11.
  • Fig. 12 is a diagram illustrating an example process 1200 performed, for example, at a UE or an apparatus of a UE, in accordance with the present disclosure.
  • Example process 1200 is an example where the apparatus or the UE (e.g., UE 120) performs operations associated with dynamic port selection for time and phase synchronization for CJT.
  • the apparatus or the UE e.g., UE 120
  • process 1200 may include receiving multiple CSI-RSs from N CSI-RS resource sets, N being a second integer, each respective CSI-RS resource set of the N CSI-RS resource sets including M respective CSI-RS resources, the receiving being based at least in part on at least one of: a first operating condition that specifies to use at least a same set of antenna ports, from the multiple antenna ports, to receive at least a first CSI-RS of the multiple CSI-RSs using the M respective CSI-RS resources of a first CSI-RS resource set of the N CSI-RS resource sets and a second CSI-RS of the multiple CSI-RSs using the M respective CSI-RS resources of a second CSI-RS resource set of the N CSI-RS resource sets, or a second operating condition that specifies to receive the M respective CSI-RS resources of each respective CSI-RS resource set of the N CSI-RS resource sets using each antenna port included in the M SRS ports that are used to transmit the one or
  • the UE may receive multiple CSI-RSs from N CSI-RS resource sets, N being a second integer, each respective CSI-RS resource set of the N CSI-RS resource sets including M respective CSI-RS resources, the receiving being based at least in part on at least one of: a first operating condition that specifies to use at least a same set of antenna ports, from the multiple antenna ports, to receive at least a first CSI-RS of the multiple CSI-RSs using the M respective CSI-RS resources of a first CSI-RS resource set of the N CSI-RS resource sets and a second CSI-RS of the multiple CSI-RSs using the M respective CSI-RS resources of a second CSI-RS resource set of the N CSI-RS resource sets, or a second operating condition that specifies to receive the M respective CSI-RS resources of each respective CSI-RS resource set of the N CSI-RS resource sets using each
  • Process 1200 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.
  • receiving the N CSI-RS resource sets is based at least in part on the first operating condition, and the first operating condition further specifies to not use different sets of antenna ports of the multiple antenna ports to receive the first CSI-RS resource set and the second CSI-RS resource set.
  • each respective antenna port of the M SRS ports is linked to M respective CSI-RS resource of the A CSI-RS resources of each respective CSI-RS resource set of the N CSI-RS resource sets, and a respective portion of the CSI-RS carried by the respective CSI-RS resource is precoded based at least in part on a respective SRS of the one or more SRSs that is transmitted via the respective SRS port.
  • transmitting the one or more SRSs using the M SRS ports includes transmitting the one or more SRSs using a first antenna port of the multiple antenna ports and a second antenna port of the multiple antenna ports, the first antenna port and the second antenna port are included in the M SRS ports, the first CSI-RS resource set and the second CSI-RS resource set are linked to the M SRS ports, and receiving N CSI-RS resource sets includes receiving the first CSI-RS and the second CSI-RS using the first antenna port, the second antenna port, and at least a third antenna port of the multiple antenna ports, the third antenna port not being included in the M SRS ports used to transmit the one or more SRSs, and process 1200 includes not using a portion of the first CSI-RS and a portion of the second CSI-RS that are received via the third antenna port to calculate a time offset and a phase offset between the first TRP and a second TRP.
  • each respective CSI-RS resource of the M respective CSI-RS resources in a CSI-RS resource set of the N C SI-RS resource sets is linked to a respective antenna port included in the M SRS ports, and process 1200 includes receiving an indication to transmit a CSI report that is based at least in part on a respective subset of CSI-RS resources of the M respective CSI-RS resources in the CSI-RS resource set.
  • process 1200 includes receiving, prior to the unicast DCI field, a configuration that specifies one or more potential subsets of SRS antenna ports of the M SRS ports, the unicast DCI field indicating a particular subset of SRS antenna ports from the one or more potential subsets of SRS antenna ports, and generating the CSI report using, as the respective subset of CSI-RS resources, each CSI-RS resource of the one or more respective CSI-RS resources in the respective CSI-RS resource set that is linked to the particular subset of SRS antenna ports.
  • process 1200 includes receiving, prior to the unicast DCI field, a configuration that specifies one or more potential subsets of respective CSI-RS resources of each respective CSI-RS resource set, the unicast DCI field indicating a particular subset of respective CSI-RS resources from the one or more potential subsets of respective CSI-RS resources, and generating the CSI report using, as the respective subset of CSI-RS resources, each CSI-RS resource of the particular subset of the respective CSI-RS resources in the respective CSI-RS resource set.
  • each CSI-RS resource of the particular subset of the respective CSI-RS resources in each respective CSI-RS resource set is linked to a respective antenna port of the M SRS ports.
  • the unicast DCI field indicates a selection of a codepoint entry.
  • the multiple antenna ports include any combination of one or more transmit antenna ports, one or more receive antenna ports, or one or more transceiver antenna ports.
  • process 1300 may include receiving an SRS from a UE (block 1310) .
  • the first TRP e.g., using reception component 1502 and/or communication manager 1506, depicted in Fig. 15
  • process 1300 may include receiving an indication of a time offset and a phase offset between the first TRP and a second TRP (block 1330) .
  • the first TRP e.g., using reception component 1502 and/or communication manager 1506, depicted in Fig. 15
  • Process 1300 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.
  • receiving the indication includes transmitting the indication in a unicast DCI field.
  • process 1300 includes transmitting, prior to the unicast DCI field, a configuration that specifies one or more potential subsets of CSI-RS resources of the CSI-RS resource set, and the unicast DCI field indicates a particular subset of CSI-RS resources from the one or more potential subsets of CSI-RS resources.
  • the unicast DCI field indicates a selection of a codepoint entry.
  • process 1300 may include additional blocks, fewer blocks, different blocks, or differently arranged blocks than those depicted in Fig. 13. Additionally, or alternatively, two or more of the blocks of process 1300 may be performed in parallel.
  • Fig. 14 is a diagram of an example apparatus 1400 for wireless communication, in accordance with the present disclosure.
  • the apparatus 1400 may be a UE, or a UE may include the apparatus 1400.
  • the apparatus 1400 includes a reception component 1402, a transmission component 1404, and/or a communication manager 1406, 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 1406 is the communication manager 140 described in connection with Fig. 1.
  • the apparatus 1400 may communicate with another apparatus 1408, such as a UE or a network node (such as a CU, a DU, an RU, or a base station) , using the reception component 1402 and the transmission component 1404.
  • another apparatus 1408 such as a UE or a network node (such as a CU, a DU, an RU, or a base station) , using the reception component 1402 and the transmission component 1404.
  • the reception component 1402 may receive communications, such as reference signals, control information, data communications, or a combination thereof, from the apparatus 1408.
  • the reception component 1402 may provide received communications to one or more other components of the apparatus 1400.
  • the reception component 1402 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 1400.
  • the communication manager 1406 may support operations of the reception component 1402 and/or the transmission component 1404. For example, the communication manager 1406 may receive information associated with configuring reception of communications by the reception component 1402 and/or transmission of communications by the transmission component 1404. Additionally, or alternatively, the communication manager 1406 may generate and/or provide control information to the reception component 1402 and/or the transmission component 1404 to control reception and/or transmission of communications.
  • the transmission component 1404 may transmit one or more SRSs using M SRS ports that are configured from multiple antenna ports, M being a first integer.
  • the reception component 1402 may receive multiple CSI-RSs from N CSI-RS resource sets, N being a second integer, each respective CSI-RS resource set of the N CSI-RS resource sets including M respective CSI-RS resources, the receiving being based at least in part on at least one of a first operating condition that specifies to use at least a same set of antenna ports, from the multiple antenna ports, to receive at least a first CSI-RS of the multiple CSI-RSs using the M respective CSI-RS resources of a first CSI-RS resource set of the N CSI-RS resource sets and a second CSI-RS of the multiple CSI-RSs using the M respective CSI-RS resources of a second CSI-RS resource set of the N CSI-RS resource sets, or a second operating condition that specifies to receive the M respective CSI-RS resources of each respective CSI-RS resource set of the N
  • the reception component 1402 may receive, prior to the unicast DCI field, a configuration that specifies one or more potential subsets of SRS antenna ports of the M SRS ports, and the unicast DCI field indicates a particular subset of SRS antenna ports from the one or more potential subsets of SRS antenna ports.
  • the communication manager 1406 may generate the CSI report using, as the respective subset of CSI-RS resources, each CSI-RS resource of the one or more respective CSI-RS resources in the respective CSI-RS resource set that is linked to the particular subset of SRS antenna ports.
  • the reception component 1402 may receive, prior to the unicast DCI field, a configuration that specifies one or more potential subsets of respective CSI-RS resources of each respective CSI-RS resource set, and the unicast DCI field indicates a particular subset of respective CSI-RS resources from the one or more potential subsets of respective CSI-RS resources.
  • the communication manager 1406 may generate the CSI report using, as the respective subset of CSI-RS resources, each CSI-RS resource of the particular subset of the respective CSI-RS resources in the respective CSI-RS resource set.
  • Fig. 15 is a diagram of an example apparatus 1500 for wireless communication, in accordance with the present disclosure.
  • the apparatus 1500 may be a TRP, or a TRP may include the apparatus 1500.
  • the apparatus 1500 includes a reception component 1502, a transmission component 1504, and/or a communication manager 1506, 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 1506 is the communication manager 150 described in connection with Fig. 1.
  • the apparatus 1500 may communicate with another apparatus 1508, such as a UE or a network node (such as a CU, a DU, an RU, or a base station) , using the reception component 1502 and the transmission component 1504.
  • another apparatus 1508 such as a UE or a network node (such as a CU, a DU, an RU, or a base station) , using the reception component 1502 and the transmission component 1504.
  • the apparatus 1500 may be configured to perform one or more operations described herein in connection with Figs. 6-11. Additionally, or alternatively, the apparatus 1500 may be configured to perform one or more processes described herein, such as process 1300 of Fig. 13, or a combination thereof.
  • the apparatus 1500 and/or one or more components shown in Fig. 15 may include one or more components of the TRP described in connection with Fig. 2. Additionally, or alternatively, one or more components shown in Fig. 15 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.
  • 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 1502 may receive communications, such as reference signals, control information, data communications, or a combination thereof, from the apparatus 1508.
  • the reception component 1502 may provide received communications to one or more other components of the apparatus 1500.
  • the reception component 1502 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 1500.
  • the reception component 1502 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 TRP described in connection with Fig. 2.
  • the reception component 1502 and/or the transmission component 1504 may include or may be included in a network interface.
  • the network interface may be configured to obtain and/or output signals for the apparatus 1500 via one or more communications links, such as a backhaul link, a midhaul link, and/or a fronthaul link.
  • the communication manager 1506 may support operations of the reception component 1502 and/or the transmission component 1504. For example, the communication manager 1506 may receive information associated with configuring reception of communications by the reception component 1502 and/or transmission of communications by the transmission component 1504. Additionally, or alternatively, the communication manager 1506 may generate and/or provide control information to the reception component 1502 and/or the transmission component 1504 to control reception and/or transmission of communications.
  • the reception component 1502 may receive an SRS from a UE.
  • the transmission component 1504 may transmit a CSI-RS that is based at least in part on a CSI-RS resource set that includes one or more CSI-RS resources, the CSI-RS including precoding that is based at least in part on the SRS.
  • the reception component 1502 may receive an indication of a time offset and a phase offset between the first TRP and a second TRP.
  • the transmission component 1504 may transmit, prior to the unicast DCI field, a configuration that specifies one or more potential subsets of SRS antenna ports of multiple SRS antenna ports that are configured at the UE, and the unicast DCI field indicates a particular subset of SRS antenna ports from the one or more potential subsets of SRS antenna ports. In other aspects, the transmission component 1504 may transmit, prior to the unicast DCI field, a configuration that specifies one or more potential subsets of CSI-RS resources of the CSI-RS resource set, and the unicast DCI field indicates a particular subset of CSI-RS resources from the one or more potential subsets of CSI-RS resources.
  • Fig. 15 The number and arrangement of components shown in Fig. 15 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. 15. Furthermore, two or more components shown in Fig. 15 may be implemented within a single component, or a single component shown in Fig. 15 may be implemented as multiple, distributed components. Additionally, or alternatively, a set of (one or more) components shown in Fig. 15 may perform one or more functions described as being performed by another set of components shown in Fig. 15.
  • a method of wireless communication performed by a user equipment (UE) comprising: transmitting one or more sounding reference signals (SRSs) using M SRS ports that are configured from multiple antenna ports, M being a first integer; and receiving multiple channel state information reference signals (CSI-RSs) from N CSI-RS resource sets, N being a second integer, each respective CSI-RS resource set of the N CSI-RS resource sets including M respective CSI-RS resources, the receiving being based at least in part on at least one of: a first operating condition that specifies to use at least a same set of antenna ports, from the multiple antenna ports, to receive at least a first CSI-RS of the multiple CSI-RSs using the M respective CSI-RS resources of a first CSI-RS resource set of the N C SI-RS resource sets and a second CSI-RS of the multiple CSI-RSs using the M respective CSI-RS resources of a second CSI-RS resource set of the N CSI-RS resource sets, or a second operating condition that specifies
  • Aspect 2 The method of Aspect 1, wherein receiving the N CSI-RS resource sets is based at least in part on the first operating condition, and wherein the first operating condition further specifies to not use different sets of antenna ports of the multiple antenna ports to receive the first CSI-RS resource set and the second CSI-RS resource set.
  • Aspect 3 The method of any of Aspects 1-2, wherein each respective antenna port of the M SRS ports is linked to M respective CSI-RS resource of the A CSI-RS resources of each respective CSI-RS resource set of the N CSI-RS resource sets, wherein a respective portion of the CSI-RS carried by the respective CSI-RS resource is precoded based at least in part on a respective SRS of the one or more SRSs that is transmitted via the respective SRS port.
  • Aspect 4 The method of any of Aspects 1-3, wherein receiving the multiple CSI-RSs further comprises: receiving the first CSI-RS using the first CSI-RS resource set and the second CSI-RS using the second CSI-RS resource set based at least in part on at least one of the first operating condition or the second operating condition, and wherein the method further comprises: calculating a time offset and a phase offset between a first transmit-receive point (TRP) and a second TRP using the first CSI-RS received using the first CSI-RS resource set, the second CSI-RS received using the second CSI-RS resource set, the M SRS ports that are linked to the first CSI-RS, and the M SRS ports that are linked to the second CSI-RS; and transmitting an indication of the time offset and the phase offset to at least one of the first TRP or the second TRP.
  • TRP transmit-receive point
  • Aspect 5 The method of any of Aspects 1-4, wherein transmitting the one or more SRSs using the M SRS ports comprises: transmitting the one or more SRSs using a first antenna port of the multiple antenna ports and a second antenna port of the multiple antenna ports, wherein the first antenna port and the second antenna port are included in the M SRS ports, wherein the first CSI-RS resource set and the second CSI-RS resource set are linked to the M SRS ports, wherein receiving the N CSI-RS resource sets further comprises: receiving the first CSI-RS and the second CSI-RS using the first antenna port, the second antenna port, and at least a third antenna port of the multiple antenna ports, wherein the third antenna port is not included in the M SRS ports used to transmit the one or more SRSs, and wherein the method further comprises: not using a portion of the first CSI-RS and a portion of the second CSI-RS that are received via the third antenna port to calculate a time offset and a phase offset between the first TRP and a second TRP.
  • Aspect 6 The method of any of Aspects 1-5, wherein each respective CSI-RS resource of the M respective CSI-RS resources in a CSI-RS resource set of the N CSI-RS resource sets is linked to a respective antenna port included in the M SRS ports, and wherein the method further comprises: receiving an indication to transmit a CSI report that is based at least in part on a respective subset of CSI-RS resources of the M respective CSI-RS resources in the CSI-RS resource set.
  • Aspect 7 The method of Aspect 6, wherein receiving the indication comprises: receiving the indication in a unicast downlink control information (DCI) field.
  • DCI downlink control information
  • Aspect 8 The method of Aspect 7, further comprising: receiving, prior to the unicast DCI field, a configuration that specifies one or more potential subsets of SRS antenna ports of the M SRS ports, wherein the unicast DCI field indicates a particular subset of SRS antenna ports from the one or more potential subsets of SRS antenna ports; and generating the CSI report using, as the respective subset of CSI-RS resources, each CSI-RS resource of the one or more respective CSI-RS resources in the respective CSI-RS resource set that is linked to the particular subset of SRS antenna ports.
  • Aspect 11 The method of any of Aspects 7-10, wherein the unicast DCI field indicates a selection of a codepoint entry.
  • Aspect 12 The method of any of Aspects 1-11, wherein the multiple antenna ports comprise any combination of: one or more transmit antenna ports, one or more receive antenna ports, or one or more transceiver antenna ports.
  • Aspect 15 The method of Aspect 14, wherein receiving the indication comprises: transmitting the indication in a unicast downlink control information (DCI) field.
  • DCI downlink control information
  • Aspect 16 The method of Aspect 15, further comprising: transmitting, prior to the unicast DCI field, a configuration that specifies one or more potential subsets of SRS antenna ports of multiple SRS antenna ports that are configured at the UE, wherein the unicast DCI field indicates a particular subset of SRS antenna ports from the one or more potential subsets of SRS antenna ports.
  • Aspect 18 The method of Aspect 17, wherein each CSI-RS resource of the particular subset of the CSI-RS resources is linked to a respective antenna port of multiple SRS antenna ports at the UE.
  • Aspect 19 The method of any of Aspects 15-17, wherein the unicast DCI field indicates a selection of a codepoint entry.
  • Aspect 24 A non-transitory computer-readable medium storing a set of instructions for wireless communication, the set of instructions comprising one or more instructions that, when executed by one or more processors of a device, cause the device to perform the method of one or more of Aspects 1-12.
  • Aspect 26 An apparatus for wireless communication at a device, the apparatus comprising one or more memories and one or more processors coupled to the one or more memories, the one or more processors individually or collectively configured to cause the device to perform the method of one or more of Aspects 1-12.
  • Aspect 27 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 13-19.
  • Aspect 29 An apparatus for wireless communication, the apparatus comprising at least one means for performing the method of one or more of Aspects 13-19.
  • Aspect 33 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 13-19.
  • 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.
  • 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)
  • Signal Processing (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

Divers aspects de la présente divulgation se rapportent, de façon générale, à la communication sans fil. Selon certains aspects, un équipement utilisateur (UE) peut transmettre un ou plusieurs signaux de référence de sondage (SRS) au moyen de M ports SRS. L'UE peut recevoir de multiples signaux de référence d'informations d'état de canal (CSI-RS) provenant de N ensembles de ressources CSI-RS, et chaque ensemble de ressources CSI-RS respectif comprend M ressources CSI-RS respectives. La réception peut être basée au moins en partie sur une première condition de fonctionnement qui spécifie d'utiliser au moins un même ensemble de ports d'antenne afin de recevoir au moins un premier CSI-RS et un second CSI-RS, et/ou une seconde condition de fonctionnement qui spécifie de recevoir les M ressources CSI-RS respectives de chaque ensemble de ressources CSI-RS respectif au moyen de chaque port d'antenne inclus dans les M ports SRS qui sont liés aux M ressources CSI-RS respectives des N ensembles de ressources CSI-RS. De nombreux autres aspects sont décrits.
PCT/CN2024/084294 2024-03-28 2024-03-28 Sélection de port dynamique pour synchronisation temporelle et de phase pour transmission conjointe cohérente Pending WO2025199846A1 (fr)

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20150223089A1 (en) * 2014-01-31 2015-08-06 Broadcom Corporation Time offset acquisition for dual connectivity
US20200014507A1 (en) * 2018-07-09 2020-01-09 Qualcomm Incorporated Sounding reference signals and channel state information reference signals enhancements for coordinated multipoint communications
WO2022255721A1 (fr) * 2021-06-01 2022-12-08 삼성전자 주식회사 Procédé et dispositif de synchronisation temporelle et de phase entre des stations de base dans une communication coopérative en réseau
CN115811342A (zh) * 2021-09-13 2023-03-17 联发科技股份有限公司 无线通信系统中下行链路多天线传输方法

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20150223089A1 (en) * 2014-01-31 2015-08-06 Broadcom Corporation Time offset acquisition for dual connectivity
US20200014507A1 (en) * 2018-07-09 2020-01-09 Qualcomm Incorporated Sounding reference signals and channel state information reference signals enhancements for coordinated multipoint communications
WO2022255721A1 (fr) * 2021-06-01 2022-12-08 삼성전자 주식회사 Procédé et dispositif de synchronisation temporelle et de phase entre des stations de base dans une communication coopérative en réseau
CN115811342A (zh) * 2021-09-13 2023-03-17 联发科技股份有限公司 无线通信系统中下行链路多天线传输方法

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