WO2023039695A1 - Rapports d'informations d'état de canal liés à un domaine temporel pour une communication sans fil - Google Patents

Rapports d'informations d'état de canal liés à un domaine temporel pour une communication sans fil Download PDF

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Publication number
WO2023039695A1
WO2023039695A1 PCT/CN2021/118116 CN2021118116W WO2023039695A1 WO 2023039695 A1 WO2023039695 A1 WO 2023039695A1 CN 2021118116 W CN2021118116 W CN 2021118116W WO 2023039695 A1 WO2023039695 A1 WO 2023039695A1
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WIPO (PCT)
Prior art keywords
csi
pmi
csi report
cqi
cqi values
Prior art date
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PCT/CN2021/118116
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English (en)
Inventor
Runxin WANG
Yu Zhang
Muhammad Sayed Khairy Abdelghaffar
Hwan Joon Kwon
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Qualcomm Incorporated
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Publication date
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Priority to PCT/CN2021/118116 priority Critical patent/WO2023039695A1/fr
Publication of WO2023039695A1 publication Critical patent/WO2023039695A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
    • H04B7/0613—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission
    • H04B7/0615—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal
    • H04B7/0619—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal using feedback from receiving side
    • H04B7/0636—Feedback format
    • H04B7/0639—Using selective indices, e.g. of a codebook, e.g. pre-distortion matrix index [PMI] or for beam selection
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/0413—MIMO systems
    • H04B7/0456—Selection of precoding matrices or codebooks, e.g. using matrices antenna weighting
    • H04B7/0478—Special codebook structures directed to feedback optimisation
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
    • H04B7/0613—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission
    • H04B7/0615—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal
    • H04B7/0619—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal using feedback from receiving side
    • H04B7/0621—Feedback content
    • H04B7/063—Parameters other than those covered in groups H04B7/0623 - H04B7/0634, e.g. channel matrix rank or transmit mode selection
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
    • H04B7/0613—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission
    • H04B7/0615—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal
    • H04B7/0619—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal using feedback from receiving side
    • H04B7/0621—Feedback content
    • H04B7/0632—Channel quality parameters, e.g. channel quality indicator [CQI]
    • 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
    • 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
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0048—Allocation of pilot signals, i.e. of signals known to the receiver
    • 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
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0053—Allocation of signaling, i.e. of overhead other than pilot signals
    • H04L5/0057—Physical resource allocation for CQI

Definitions

  • the technology discussed below relates generally to wireless communication systems, and more particularly, to time domain related channel state information (CSI) reports in wireless communication.
  • CSI channel state information
  • Wireless communication networks are widely deployed to provide various communication services such as telephony, video, data, messaging, broadcasts, and so on.Such networks, which are usually multiple access networks, support communications for multiple users by sharing the available network resources.
  • multiple-access technologies include code division multiple access (CDMA) systems, time division multiple access (TDMA) systems, frequency division multiple access (FDMA) systems, orthogonal frequency division multiple access (OFDMA) systems, single-carrier frequency division multiple access (SC-FDMA) systems, and time division synchronous code division multiple access (TD-SCDMA) systems.
  • CDMA code division multiple access
  • TDMA time division multiple access
  • FDMA frequency division multiple access
  • OFDMA orthogonal frequency division multiple access
  • SC-FDMA single-carrier frequency division multiple access
  • TD-SCDMA time division synchronous code division multiple access
  • 5G New Radio 5G New Radio
  • 3GPP Third Generation Partnership Project
  • scalability e.g., with Internet of Things (IoT)
  • IoT Internet of Things
  • 5G NR may be based on the 4G Long Term Evolution (LTE) standard.
  • LTE Long Term Evolution
  • CSI channel state information
  • a CSI report can include Channel Quality Information (CQI) , Precoding Matrix Indicator (PMI) , CSI-RS Resource Indicator (CRI) , Layer Indicator (LI) , and Rank Indicator (RI) , etc.
  • CQI Channel Quality Information
  • PMI Precoding Matrix Indicator
  • CRI CSI-RS Resource Indicator
  • LI Layer Indicator
  • RI Rank Indicator
  • One aspect of the disclosure provides a method for wireless communications by a user equipment (UE) .
  • the method includes receiving a first channel state information reference signal (CSI-RS) from a scheduling entity.
  • the method further includes transmitting a first CSI report based on the first CSI-RS, the first CSI report including one or more first CSI components.
  • the method further includes receiving a second CSI-RS from the scheduling entity.
  • the method further includes transmitting a second CSI report based on the second CSI-RS and the first CSI report, the second CSI report including one or more second CSI components derived at least in part from the one or more first CSI components.
  • the method includes transmitting a first channel state information reference signal (CSI-RS) to a user equipment (UE) .
  • the method further includes receiving, from the UE, a first CSI report based on the first CSI-RS, the first CSI report including one or more first CSI components.
  • the method further includes transmitting a second CSI-RS to the UE.
  • the method further includes receiving, from the UE, a second CSI report based on the second CSI-RS and the first CSI report, the second CSI report including one or more second CSI components derived at least in part from the one or more first CSI components.
  • the UE includes a transceiver configured for wireless communication, a memory, and a processor coupled with the transceiver and the memory.
  • the processor and the memory are configured to receive a first channel state information reference signal (CSI-RS) from a scheduling entity.
  • the processor and the memory are further configured to transmit a first CSI report based on the first CSI-RS, the first CSI report including one or more first CSI components.
  • the processor and the memory are further configured to receive a second CSI-RS from the scheduling entity.
  • the processor and the memory are further configured to transmit a second CSI report based on the second CSI-RS and the first CSI report, the second CSI report including one or more second CSI components derived at least in part from the one or more first CSI components.
  • the scheduling entity includes a transceiver configured for wireless communication, a memory, and a processor coupled with the transceiver and the memory.
  • the processor and the memory are configured to transmit a first channel state information reference signal (CSI-RS) to a user equipment (UE) .
  • the processor and the memory are further configured to receive, from the UE, a first CSI report based on the first CSI-RS, the first CSI report including one or more first CSI components.
  • CSI-RS channel state information reference signal
  • the processor and the memory are further configured to transmit a second CSI-RS to the UE.
  • the processor and the memory are further configured to receive, from the UE, a second CSI report based on the second CSI-RS and the first CSI report, the second CSI report including one or more second CSI components derived at least in part from the one or more first CSI components.
  • FIG. 1 is a schematic illustration of a wireless communication system according to some aspects.
  • FIG. 2 is an illustration of an example of a radio access network according to some aspects.
  • FIG. 3 is a schematic illustration of an organization of wireless resources in an air interface utilizing orthogonal frequency divisional multiplexing (OFDM) according to some aspects.
  • OFDM orthogonal frequency divisional multiplexing
  • FIG. 4 is a block diagram illustrating a wireless communication system supporting multiple-input multiple-output (MIMO) communication according to some aspects.
  • MIMO multiple-input multiple-output
  • FIG. 5 illustrates an exemplary channel state information (CSI) resource mapping to support different report/measurement configurations according to some aspects.
  • CSI channel state information
  • FIG. 6 is a diagram illustrating multiple time domain related CSI reports according to some aspects.
  • FIG. 7 is a diagram illustrating a first process of generating channel quality indicator (CQI) values of a delta CSI report using a differential function according to some aspects.
  • CQI channel quality indicator
  • FIG. 8 is a diagram illustrating a second process of generating channel quality indicator (CQI) values of a delta CSI report using a differential function according to some aspects.
  • CQI channel quality indicator
  • FIG. 9 is a conceptual illustration of exemplary Type-II PMIs according to some aspects.
  • FIG. 10 is a conceptual illustration of exemplary eType-II PMIs according to some aspects.
  • FIG. 11 is a conceptual illustration of information contained in channel state feedback (CSF) according to some aspects.
  • CSF channel state feedback
  • FIG. 12 is a block diagram illustrating an example of a hardware implementation for a scheduling entity according to some aspects.
  • FIG. 13 is a flow chart illustrating an exemplary process at a scheduling entity for channel state feedback using time domain related CSI reports according to some aspects.
  • FIG. 14 is a block diagram conceptually illustrating an example of a hardware implementation for a scheduled entity according to some aspects.
  • FIG. 15 is a flow chart illustrating an exemplary process at a scheduled entity for channel state feedback using time domain related CSI reports according to some aspects.
  • implementations and/or uses may come about via integrated chip examples and other non-module-component based devices (e.g., end-user devices, vehicles, communication devices, computing devices, industrial equipment, retail/purchasing devices, medical devices, AI-enabled devices, etc. ) . While some examples may or may not be specifically directed to use cases or applications, a wide assortment of applicability of described innovations may occur.
  • non-module-component based devices e.g., end-user devices, vehicles, communication devices, computing devices, industrial equipment, retail/purchasing devices, medical devices, AI-enabled devices, etc.
  • Implementations may range a spectrum from chip-level or modular components to non-modular, non-chip-level implementations and further to aggregate, distributed, or OEM devices or systems incorporating one or more aspects of the described innovations.
  • devices incorporating described aspects and features may also necessarily include additional components and features for implementation and practice of claimed and described implementations.
  • transmission and reception of wireless signals necessarily includes a number of components for analog and digital purposes (e.g., hardware components including antenna, RF-chains, power amplifiers, modulators, buffer, processor (s) , interleaver, adders/summers, etc. ) .
  • innovations described herein may be practiced in a wide variety of devices, chip-level components, systems, distributed arrangements, end-user devices, etc. of varying sizes, shapes and constitutions.
  • aspects of the disclosure provide apparatuses and methods of channel state information (CSI) feedback using multiple time domain related CSI reports.
  • a user equipment UE can transmit multiple CSI reports that are related by certain differential functions such that the overhead for sending multiple CSI reports can be reduced.
  • the various concepts presented throughout this disclosure may be implemented across a broad variety of telecommunication systems, network architectures, and communication standards.
  • the wireless communication system 100 includes three interacting domains: a core network 102, a radio access network (RAN) 104, and a user equipment (UE) 106.
  • the UE 106 may be enabled to carry out data communication with an external data network 110, such as (but not limited to) the Internet.
  • the RAN 104 may implement any suitable wireless communication technology or technologies to provide radio access to the UE 106.
  • the RAN 104 may operate according to 3 rd Generation Partnership Project (3GPP) New Radio (NR) specifications, often referred to as 5G.
  • 3GPP 3 rd Generation Partnership Project
  • NR New Radio
  • the RAN 104 may operate under a hybrid of 5G NR and Evolved Universal Terrestrial Radio Access Network (eUTRAN) standards, often referred to as LTE.
  • eUTRAN Evolved Universal Terrestrial Radio Access Network
  • the 3GPP refers to this hybrid RAN as a next-generation RAN, or NG-RAN.
  • NG-RAN next-generation RAN
  • a base station is a network element in a radio access network responsible for radio transmission and reception in one or more cells to or from a UE.
  • a base station may variously be referred to by those skilled in the art as a base transceiver station (BTS) , a radio base station, a radio transceiver, a transceiver function, a basic service set (BSS) , an extended service set (ESS) , an access point (AP) , a Node B (NB) , an eNode B (eNB) , a gNode B (gNB) , a transmission and reception point (TRP) , or some other suitable terminology.
  • a base station may include two or more TRPs that may be collocated or non- collocated. Each TRP may communicate on the same or different carrier frequency within the same or different frequency band.
  • the radio access network 104 is further illustrated supporting wireless communication for multiple mobile apparatuses.
  • a mobile apparatus may be referred to as user equipment (UE) in 3GPP standards, but may also be referred to by those skilled in the art as a mobile station (MS) , a subscriber station, a mobile unit, a subscriber unit, a wireless unit, a remote unit, a mobile device, a wireless device, a wireless communications device, a remote device, a mobile subscriber station, an access terminal (AT) , a mobile terminal, a wireless terminal, a remote terminal, a handset, a terminal, a user agent, a mobile client, a client, or some other suitable terminology.
  • a UE may be an apparatus (e.g., a mobile apparatus) that provides a user with access to network services.
  • a “mobile” apparatus need not necessarily have a capability to move, and may be stationary.
  • the term mobile apparatus or mobile device broadly refers to a diverse array of devices and technologies.
  • UEs may include a number of hardware structural components sized, shaped, and arranged to help in communication; such components can include antennas, antenna arrays, RF chains, amplifiers, one or more processors, etc. electrically coupled to each other.
  • a mobile apparatus examples include a mobile, a cellular (cell) phone, a smart phone, a session initiation protocol (SIP) phone, a laptop, a personal computer (PC) , a notebook, a netbook, a smartbook, a tablet, a personal digital assistant (PDA) , and a broad array of embedded systems, e.g., corresponding to an “Internet of things” (IoT) .
  • IoT Internet of things
  • a mobile apparatus may additionally be an automotive or other transportation vehicle, a remote sensor or actuator, a robot or robotics device, a satellite radio, a global positioning system (GPS) device, an object tracking device, a drone, a multi-copter, a quad-copter, a remote control device, a consumer and/or wearable device, such as eyewear, a wearable camera, a virtual reality device, a smart watch, a health or fitness tracker, a digital audio player (e.g., MP3 player) , a camera, a game console, etc.
  • GPS global positioning system
  • a mobile apparatus may additionally be a digital home or smart home device such as a home audio, video, and/or multimedia device, an appliance, a vending machine, intelligent lighting, a home security system, a smart meter, etc.
  • a mobile apparatus may additionally be a smart energy device, a security device, a solar panel or solar array, a municipal infrastructure device controlling electric power (e.g., a smart grid) , lighting, water, etc.; an industrial automation and enterprise device; a logistics controller; agricultural equipment, etc.
  • a mobile apparatus may provide for connected medicine or telemedicine support, e.g., health care at a distance.
  • Telehealth devices may include telehealth monitoring devices and telehealth administration devices, whose communication may be given preferential treatment or prioritized access over other types of information, e.g., in terms of prioritized access for transport of critical service data, and/or relevant QoS for transport of critical service data.
  • Wireless communication between a RAN 104 and a UE 106 may be described as utilizing an air interface.
  • Transmissions over the air interface from a base station (e.g., base station 108) to one or more UEs (e.g., UE 106) may be referred to as downlink (DL) transmission.
  • DL downlink
  • the term downlink may refer to a point-to-multipoint transmission originating at a scheduling entity (described further below; e.g., base station 108) .
  • Another way to describe this scheme may be to use the term broadcast channel multiplexing.
  • Uplink Transmissions from a UE (e.g., UE 106) to a base station (e.g., base station 108) may be referred to as uplink (UL) transmissions.
  • UL uplink
  • the term uplink may refer to a point-to-point transmission originating at a scheduled entity (described further below; e.g., UE 106) .
  • a scheduling entity e.g., a base station 108 allocates resources for communication among some or all devices and equipment within its service area or cell.
  • the scheduling entity may be responsible for scheduling, assigning, reconfiguring, and releasing resources for one or more scheduled entities. That is, for scheduled communication, UEs 106, which may be scheduled entities, may utilize resources allocated by the scheduling entity 108.
  • Base stations 108 are not the only entities that may function as scheduling entities. That is, in some examples, a UE may function as a scheduling entity, scheduling resources for one or more scheduled entities (e.g., one or more other UEs) .
  • a scheduling entity 108 may broadcast downlink traffic 112 to one or more scheduled entities 106.
  • the scheduling entity 108 is a node or device responsible for scheduling traffic in a wireless communication network, including the downlink traffic 112 and, in some examples, uplink traffic 116 from one or more scheduled entities 106 to the scheduling entity 108.
  • the scheduled entity 106 is a node or device that receives downlink control information 114, including but not limited to scheduling information (e.g., a grant) , synchronization or timing information, or other control information from another entity in the wireless communication network such as the scheduling entity 108.
  • the scheduled entity 106 may further transmit uplink control information 118, including but not limited to a scheduling request or feedback information, or other control information to the scheduling entity 108.
  • the uplink and/or downlink control information 114 and/or 118 and/or traffic information 112 and/or 116 may be transmitted on a waveform that may be time-divided into frames, subframes, slots, and/or symbols.
  • a symbol may refer to a unit of time that, in an orthogonal frequency division multiplexed (OFDM) waveform, carries one resource element (RE) per sub-carrier.
  • a slot may carry 7 or 14 OFDM symbols.
  • a subframe may refer to a duration of 1ms. Multiple subframes or slots may be grouped together to form a single frame or radio frame.
  • a frame may refer to a predetermined duration (e.g., 10 ms) for wireless transmissions, with each frame consisting of, for example, 10 subframes of 1 ms each.
  • a predetermined duration e.g. 10 ms
  • each frame consisting of, for example, 10 subframes of 1 ms each.
  • these definitions are not required, and any suitable scheme for organizing waveforms may be utilized, and various time divisions of the waveform may have any suitable duration.
  • base stations 108 may include a backhaul interface for communication with a backhaul portion 120 of the wireless communication system.
  • the backhaul 120 may provide a link between a base station 108 and the core network 102.
  • a backhaul network may provide interconnection between the respective base stations 108.
  • Various types of backhaul interfaces may be employed, such as a direct physical connection, a virtual network, or the like using any suitable transport network.
  • the core network 102 may be a part of the wireless communication system 100, and may be independent of the radio access technology used in the RAN 104.
  • the core network 102 may be configured according to 5G standards (e.g., 5GC) .
  • the core network 102 may be configured according to a 4G evolved packet core (EPC) , or any other suitable standard or configuration.
  • 5G standards e.g., 5GC
  • EPC 4G evolved packet core
  • FIG. 2 a schematic illustration of a RAN 200 is provided.
  • the RAN 200 may be the same as the RAN 104 described above and illustrated in FIG. 1.
  • the geographic area covered by the RAN 200 may be divided into cellular regions (cells) that can be uniquely identified by a user equipment (UE) based on an identification broadcasted from one access point or base station.
  • FIG. 2 illustrates macrocells 202, 204, and 206, and a small cell 208, each of which may include one or more sectors (not shown) .
  • a sector is a sub-area of a cell. All sectors within one cell are served by the same base station.
  • a radio link within a sector can be identified by a single logical identification belonging to that sector.
  • the multiple sectors within a cell can be formed by groups of antennas with each antenna responsible for communication with UEs in a portion of the cell.
  • two base stations 210 and 212 are shown in cells 202 and 204; and a third base station 214 is shown controlling a remote radio head (RRH) 216 in cell 206.
  • a base station can have an integrated antenna or can be connected to an antenna or RRH by feeder cables.
  • the cells 202, 204, and 126 may be referred to as macrocells, as the base stations 210, 212, and 214 support cells having a large size.
  • a base station 218 is shown in the small cell 208 (e.g., a microcell, picocell, femtocell, home base station, home Node B, home eNode B, etc. ) which may overlap with one or more macrocells.
  • the cell 208 may be referred to as a small cell, as the base station 218 supports a cell having a relatively small size. Cell sizing can be done according to system design as well as component constraints.
  • the radio access network 200 may include any number of wireless base stations and cells. Further, a relay node may be deployed to extend the size or coverage area of a given cell.
  • the base stations 210, 212, 214, 218 provide wireless access points to a core network for any number of mobile apparatuses. In some examples, the base stations 210, 212, 214, and/or 218 may be the same as the base station/scheduling entity 108 described above and illustrated in FIG. 1.
  • FIG. 2 further includes a quadcopter or drone 220, which may be configured to function as a base station. That is, in some examples, a cell may not necessarily be stationary, and the geographic area of the cell may move according to the location of a mobile base station such as the quadcopter 220.
  • a quadcopter or drone 220 may be configured to function as a base station. That is, in some examples, a cell may not necessarily be stationary, and the geographic area of the cell may move according to the location of a mobile base station such as the quadcopter 220.
  • the cells may include UEs that may be in communication with one or more sectors of each cell.
  • each base station 210, 212, 214, 218, and 220 may be configured to provide an access point to a core network 102 (see FIG. 1) for all the UEs in the respective cells.
  • UEs 222 and 224 may be in communication with base station 210; UEs 226 and 228 may be in communication with base station 212; UEs 230 and 232 may be in communication with base station 214 by way of RRH 216; UE 234 may be in communication with base station 218; and UE 236 may be in communication with mobile base station 220.
  • the UEs 222, 224, 226, 228, 230, 232, 234, 236, 238, 240, and/or 242 may be the same as the UE/scheduled entity 106 described above and illustrated in FIG. 1.
  • a mobile network node e.g., quadcopter 220
  • quadcopter 220 may be configured to function as a UE.
  • the quadcopter 220 may operate within cell 202 by communicating with base station 210.
  • sidelink signals may be used between UEs without necessarily relying on scheduling or control information from a base station.
  • two or more UEs e.g., UEs 238, 240, and 242
  • P2P peer-to-peer
  • the UEs 238, 240, and 242 may each function as a scheduling entity or transmitting sidelink device and/or a scheduled entity or a receiving sidelink device to schedule resources and communicate sidelink signals 237 therebetween without relying on scheduling or control information from a base station.
  • two or more UEs within the coverage area of a base station (e.g., base station 212) may also communicate sidelink signals 227 over a direct link (sidelink) without conveying that communication through the base station 212.
  • the base station 212 may allocate resources to the UEs 226 and 228 for the sidelink communication.
  • sidelink signaling 227 and 237 may be implemented in a P2P network, a device-to-device (D2D) network, vehicle-to-vehicle (V2V) network, a vehicle-to-everything (V2X) , a mesh network, or other suitable direct link networks.
  • D2D device-to-device
  • V2V vehicle-to-vehicle
  • V2X vehicle-to-everything
  • the ability for a UE to communicate while moving, independent of its location is referred to as mobility.
  • the various physical channels between the UE and the radio access network are generally set up, maintained, and released under the control of an access and mobility management function (AMF, not illustrated, part of the core network 102 in FIG. 1) , which may include a security context management function (SCMF) and a security anchor function (SEAF) that perform authentication.
  • AMF access and mobility management function
  • SCMF security context management function
  • SEAF security anchor function
  • the SCMF can manage, in whole or in part, the security context for both the control plane and the user plane functionality.
  • a radio access network 200 may utilize DL-based mobility or UL-based mobility to enable mobility and handovers (i.e., the transfer of a UE’s connection from one radio channel to another) .
  • a UE may monitor various parameters of the signal from its serving cell as well as various parameters of neighboring cells. Depending on the quality of these parameters, the UE may maintain communication with one or more of the neighboring cells.
  • the UE may undertake a handoff or handover from the serving cell to the neighboring (target) cell.
  • UE 224 illustrated as a vehicle, although any suitable form of UE may be used
  • the UE 224 may transmit a reporting message to its serving base station 210 indicating this condition.
  • the UE 224 may receive a handover command, and the UE may undergo a handover to the cell 206.
  • UL reference signals from each UE may be utilized by the network to select a serving cell for each UE.
  • the base stations 210, 212, and 214/216 may broadcast unified synchronization signals (e.g., unified Primary Synchronization Signals (PSSs) , unified Secondary Synchronization Signals (SSSs) and unified Physical Broadcast Channels (PBCH) ) .
  • PSSs Primary Synchronization Signals
  • SSSs unified Secondary Synchronization Signals
  • PBCH Physical Broadcast Channels
  • the UEs 222, 224, 226, 228, 230, and 232 may receive the unified synchronization signals, derive the carrier frequency and slot timing from the synchronization signals, and in response to deriving timing, transmit an uplink pilot or reference signal.
  • the uplink pilot signal transmitted by a UE may be concurrently received by two or more cells (e.g., base stations 210 and 214/216) within the radio access network 200.
  • Each of the cells may measure the strength of the pilot signal, and the radio access network (e.g., one or more of the base stations 210 and 214/216 and/or a central node within the core network) may determine a serving cell for the UE 224.
  • the radio access network e.g., one or more of the base stations 210 and 214/216 and/or a central node within the core network
  • the network may continue to monitor the uplink pilot signal transmitted by the UE 224.
  • the network 200 may hand over the UE 224 from the serving cell to the neighboring cell, with or without informing the UE 224.
  • the synchronization signal transmitted by the base stations 210, 212, and 214/216 may be unified, the synchronization signal may not identify a particular cell, but rather may identify a zone of multiple cells operating on the same frequency and/or with the same timing.
  • the use of zones in 5G networks or other next generation communication networks enables the uplink-based mobility framework and improves the efficiency of both the UE and the network, since the number of mobility messages that need to be exchanged between the UE and the network may be reduced.
  • the air interface in the radio access network 200 may utilize one or more duplexing algorithms.
  • Duplex refers to a point-to-point communication link where both endpoints can communicate with one another in both directions.
  • Full-duplex means both endpoints can simultaneously communicate with one another.
  • Half-duplex means only one endpoint can send information to the other at a time.
  • Half-duplex emulation is frequently implemented for wireless links utilizing time division duplex (TDD) .
  • TDD time division duplex
  • transmissions in different directions on a given channel are separated from one another using time division multiplexing. That is, at some times the channel is dedicated for transmissions in one direction, while at other times the channel is dedicated for transmissions in the other direction, where the direction may change very rapidly, e.g., several times per slot.
  • a full-duplex channel In a wireless link, a full-duplex channel generally relies on physical isolation of a transmitter and receiver, and suitable interference cancellation technologies.
  • Full-duplex emulation is frequently implemented for wireless links by utilizing frequency division duplex (FDD) or spatial division duplex (SDD) .
  • FDD frequency division duplex
  • SDD spatial division duplex
  • transmissions in different directions may operate at different carrier frequencies (e.g., within paired spectrum) .
  • SDD transmissions in different directions on a given channel are separated from one another using spatial division multiplexing (SDM) .
  • full-duplex communication may be implemented within unpaired spectrum (e.g., within a single carrier bandwidth) , where transmissions in different directions occur within different sub-bands of the carrier bandwidth. This type of full-duplex communication may be referred to herein as sub-band full duplex (SBFD) , also known as flexible duplex.
  • SBFD sub-band full duplex
  • the air interface in the radio access network 200 may utilize one or more multiplexing and multiple access algorithms to enable simultaneous communication of the various devices.
  • 5G NR specifications provide multiple access for UL transmissions from UEs 222 and 224 to base station 210, and for multiplexing for DL transmissions from base station 210 to one or more UEs 222 and 224, utilizing orthogonal frequency division multiplexing (OFDM) with a cyclic prefix (CP) .
  • OFDM orthogonal frequency division multiplexing
  • CP cyclic prefix
  • 5G NR specifications provide support for discrete Fourier transform-spread-OFDM (DFT-s-OFDM) with a CP (also referred to as single-carrier FDMA (SC-FDMA) ) .
  • DFT-s-OFDM discrete Fourier transform-spread-OFDM
  • SC-FDMA single-carrier FDMA
  • multiplexing and multiple access are not limited to the above schemes, and may be provided utilizing time division multiple access (TDMA) , code division multiple access (CDMA) , frequency division multiple access (FDMA) , sparse code multiple access (SCMA) , resource spread multiple access (RSMA) , or other suitable multiple access schemes.
  • multiplexing DL transmissions from the base station 210 to UEs 222 and 224 may be provided utilizing time division multiplexing (TDM) , code division multiplexing (CDM) , frequency division multiplexing (FDM) , orthogonal frequency division multiplexing (OFDM) , sparse code multiplexing (SCM) , or other suitable multiplexing schemes.
  • FIG. 3 an expanded view of an exemplary subframe 302 is illustrated, showing an OFDM resource grid.
  • time is in the horizontal direction with units of OFDM symbols; and frequency is in the vertical direction with units of subcarriers of the carrier.
  • the resource grid 304 may be used to schematically represent time–frequency resources for a given antenna port. That is, in a multiple-input-multiple-output (MIMO) implementation with multiple antenna ports available, a corresponding multiple number of resource grids 304 may be available for communication.
  • the resource grid 304 is divided into multiple resource elements (REs) 306.
  • An RE which is 1 subcarrier ⁇ 1 symbol, is the smallest discrete part of the time–frequency grid, and contains a single complex value representing data from a physical channel or signal.
  • each RE may represent one or more bits of information.
  • a block of REs may be referred to as a physical resource block (PRB) or more simply a resource block (RB) 308, which contains any suitable number of consecutive subcarriers in the frequency domain.
  • an RB may include 12 subcarriers, a number independent of the numerology used.
  • an RB may include any suitable number of consecutive OFDM symbols in the time domain.
  • a set of continuous or discontinuous resource blocks may be referred to herein as a Resource Block Group (RBG) , sub-band, or bandwidth part (BWP) .
  • RBG Resource Block Group
  • BWP bandwidth part
  • a set of sub-bands or BWPs may span the entire bandwidth.
  • Scheduling of scheduled entities typically involves scheduling one or more resource elements 306 within one or more sub-bands or bandwidth parts (BWPs) .
  • a UE generally utilizes only a subset of the resource grid 304.
  • an RB may be the smallest unit of resources that can be allocated to a UE.
  • the RBs may be scheduled by a scheduling entity, such as a base station (e.g., gNB, eNB, etc. ) , or may be self-scheduled by a UE implementing D2D sidelink communication.
  • a scheduling entity such as a base station (e.g., gNB, eNB, etc. )
  • a base station e.g., gNB, eNB, etc.
  • the RB 308 is shown as occupying less than the entire bandwidth of the subframe 302, with some subcarriers illustrated above and below the RB 308.
  • the subframe 302 may have a bandwidth corresponding to any number of one or more RBs 308.
  • the RB 308 is shown as occupying less than the entire duration of the subframe 302, although this is merely one possible example.
  • Each 1 ms subframe 302 may consist of one or multiple adjacent slots.
  • one subframe 302 includes four slots 310, as an illustrative example.
  • a slot may be defined according to a specified number of OFDM symbols with a given cyclic prefix (CP) length.
  • CP cyclic prefix
  • a slot may include 7 or 14 OFDM symbols with a nominal CP.
  • Additional examples may include mini-slots, sometimes referred to as shortened transmission time intervals (TTIs) , having a shorter duration (e.g., one to three OFDM symbols) .
  • TTIs shortened transmission time intervals
  • These mini-slots or shortened transmission time intervals (TTIs) may in some cases be transmitted occupying resources scheduled for ongoing slot transmissions for the same or for different UEs. Any number of resource blocks may be utilized within a subframe or slot.
  • An expanded view of one of the slots 310 illustrates the slot 310 including a control region 312 and a data region 314.
  • the control region 312 may carry control channels
  • the data region 314 may carry data channels.
  • a slot may contain all DL, all UL, or at least one DL portion and at least one UL portion.
  • the structure illustrated in FIG. 3 is merely exemplary in nature, and different slot structures may be utilized, and may include one or more of each of the control region (s) and data region (s) .
  • the various REs 306 within a RB 308 may be scheduled to carry one or more physical channels, including control channels, shared channels, data channels, etc.
  • Other REs 306 within the RB 308 may also carry pilots or reference signals. These pilots or reference signals may provide for a receiving device to perform channel estimation of the corresponding channel, which may enable coherent demodulation/detection of the control and/or data channels within the RB 308.
  • the slot 310 may be utilized for broadcast, multicast, groupcast, or unicast communication.
  • a broadcast, multicast, or groupcast communication may refer to a point-to-multipoint transmission by one device (e.g., a base station, UE, or other similar device) to other devices.
  • a broadcast communication is delivered to all devices, whereas a multicast or groupcast communication is delivered to multiple intended recipient devices.
  • a unicast communication may refer to a point-to-point transmission by a one device to a single other device.
  • the scheduling entity may allocate one or more REs 306 (e.g., within the control region 312) to carry DL control information including one or more DL control channels, such as a physical downlink control channel (PDCCH) , to one or more scheduled entities (e.g., UEs) .
  • the PDCCH carries downlink control information (DCI) including but not limited to power control commands (e.g., one or more open loop power control parameters and/or one or more closed loop power control parameters) , scheduling information, a grant, and/or an assignment of REs for DL and UL transmissions.
  • DCI downlink control information
  • the PDCCH may further carry HARQ feedback transmissions such as an acknowledgment (ACK) or negative acknowledgment (NACK) .
  • HARQ is a technique well-known to those of ordinary skill in the art, wherein the integrity of packet transmissions may be checked at the receiving side for accuracy, e.g., utilizing any suitable integrity checking mechanism, such as a checksum or a cyclic redundancy check (CRC) . If the integrity of the transmission is confirmed, an ACK may be transmitted, whereas if not confirmed, a NACK may be transmitted. In response to a NACK, the transmitting device may send a HARQ retransmission, which may implement chase combining, incremental redundancy, etc.
  • the base station may further allocate one or more REs 306 (e.g., in the control region 312 or the data region 314) to carry other DL signals, such as a demodulation reference signal (DMRS) ; a phase-tracking reference signal (PT-RS) ; a channel state information (CSI) reference signal (CSI-RS) ; and a synchronization signal block (SSB) .
  • SSBs may be broadcast at regular intervals based on a periodicity (e.g., 5, 10, 20, 30, 80, or 130 ms) .
  • An SSB includes a primary synchronization signal (PSS) , a secondary synchronization signal (SSS) , and a physical broadcast control channel (PBCH) .
  • PSS primary synchronization signal
  • SSS secondary synchronization signal
  • PBCH physical broadcast control channel
  • a UE may utilize the PSS and SSS to achieve radio frame, subframe, slot, and symbol synchronization in the time domain, identify the center of the channel (system)
  • the PBCH in the SSB may further include a master information block (MIB) that includes various system information, along with parameters for decoding a system information block (SIB) .
  • the SIB may be, for example, a SystemInformationType 1 (SIB1) that may include various additional system information.
  • SIB and SIB1 together provide the minimum system information (SI) for initial access.
  • Examples of system information transmitted in the MIB may include, but are not limited to, a subcarrier spacing (e.g., default downlink numerology) , system frame number, a configuration of a PDCCH control resource set (CORESET) (e.g., PDCCH CORESET0) , a cell barred indicator, a cell reselection indicator, a raster offset, and a search space for SIB1.
  • Examples of remaining minimum system information (RMSI) transmitted in the SIB1 may include, but are not limited to, a random access search space, a paging search space, downlink configuration information, and uplink configuration information.
  • the scheduled entity may utilize one or more REs 306 to carry UL control information (UCI) including one or more UL control channels, such as a physical uplink control channel (PUCCH) , to the scheduling entity.
  • UCI may include a variety of packet types and categories, including pilots, reference signals, and information configured to enable or assist in decoding uplink data transmissions.
  • uplink reference signals may include a sounding reference signal (SRS) and an uplink DMRS.
  • the UCI may include a scheduling request (SR) , i.e., request for the scheduling entity to schedule uplink transmissions.
  • SR scheduling request
  • the scheduling entity may transmit downlink control information (DCI) that may schedule resources for uplink packet transmissions.
  • DCI may also include HARQ feedback, channel state feedback (CSF) , such as a CSI report, or any other suitable UCI.
  • CSF channel state feedback
  • one or more REs 306 may be allocated for data traffic. Such data traffic may be carried on one or more traffic channels, such as, for a DL transmission, a physical downlink shared channel (PDSCH) ; or for an UL transmission, a physical uplink shared channel (PUSCH) .
  • PDSCH physical downlink shared channel
  • PUSCH physical uplink shared channel
  • one or more REs 306 within the data region 314 may be configured to carry other signals, such as one or more SIBs and DMRSs.
  • the control region 312 of the slot 310 may include a physical sidelink control channel (PSCCH) including sidelink control information (SCI) transmitted by an initiating (transmitting) sidelink device (e.g., Tx V2X device or other Tx UE) towards a set of one or more other receiving sidelink devices (e.g., Rx V2X device or other Rx UE) .
  • the data region 314 of the slot 310 may include a physical sidelink shared channel (PSSCH) including sidelink data traffic transmitted by the initiating (transmitting) sidelink device within resources reserved over the sidelink carrier by the transmitting sidelink device via the SCI.
  • PSSCH physical sidelink shared channel
  • HARQ feedback information may be transmitted in a physical sidelink feedback channel (PSFCH) within the slot 310 from the receiving sidelink device to the transmitting sidelink device.
  • PSFCH physical sidelink feedback channel
  • one or more reference signals such as a sidelink SSB, a sidelink CSI-RS, a sidelink SRS, and/or a sidelink positioning reference signal (PRS) may be transmitted within the slot 310.
  • PRS sidelink positioning reference signal
  • Transport channels carry blocks of information called transport blocks (TB) .
  • TBS transport block size
  • MCS modulation and coding scheme
  • the channels or carriers illustrated in FIG. 3 are not necessarily all of the channels or carriers that may be utilized between devices, and those of ordinary skill in the art will recognize that other channels or carriers may be utilized in addition to those illustrated, such as other traffic, control, and feedback channels.
  • Transport channels carry blocks of information called transport blocks (TB) .
  • TBS transport block size
  • MCS modulation and coding scheme
  • the scheduling entity and/or scheduled entity may be configured for beamforming and/or multiple-input multiple-output (MIMO) technology.
  • FIG. 4 illustrates an example of a wireless communication system 400 supporting MIMO.
  • a transmitter 402 includes multiple transmit antennas 404 (e.g., N transmit antennas) and a receiver 406 includes multiple receive antennas 408 (e.g., M receive antennas) .
  • N transmit antennas e.g., N transmit antennas
  • M receive antennas e.g., M receive antennas
  • Each of the transmitter 402 and the receiver 406 may be implemented, for example, within a scheduling entity 108, a scheduled entity 106, or any other suitable wireless communication device.
  • Spatial multiplexing may be used to transmit different streams of data, also referred to as layers, simultaneously on the same time-frequency resource.
  • the data streams may be transmitted to a single UE to increase the data rate or to multiple UEs to increase the overall system capacity, the latter being referred to as multi-user MIMO (MU-MIMO) .
  • MU-MIMO multi-user MIMO
  • This is achieved by spatially precoding each data stream (i.e., multiplying the data streams with different weighting and phase shifting) and then transmitting each spatially precoded stream through multiple transmit antennas on the downlink.
  • the spatially precoded data streams arrive at the UE (s) with different spatial signatures, which enables each of the UE (s) to recover the one or more data streams destined for that UE.
  • each UE transmits a spatially precoded data stream, which enables the base station to identify the source of each spatially precoded data stream.
  • the number of data streams or layers corresponds to the rank of the transmission.
  • the rank of the MIMO system 400 is limited by the number of transmit or receive antennas 404 or 408, whichever is lower.
  • the channel conditions at the UE, as well as other considerations, such as the available resources at the base station, may also affect the transmission rank.
  • the rank (and therefore, the number of data streams) assigned to a particular UE on the downlink may be determined based on the rank indicator (RI) transmitted from the UE to the base station.
  • the RI may be determined based on the antenna configuration (e.g., the number of transmit and receive antennas) and a measured signal-to-interference-and-noise ratio (SINR) on each of the receive antennas.
  • SINR signal-to-interference-and-noise ratio
  • the RI may indicate, for example, the number of layers that may be supported under the current channel conditions.
  • the base station may use the RI, along with resource information (e.g., the available resources and amount of data to be scheduled for the UE) , to assign a transmission rank to the UE.
  • resource information e.g., the available resources and amount of data to be scheduled for the UE
  • the base station may assign the rank for DL MIMO transmissions based on UL SINR measurements (e.g., based on a Sounding Reference Signal (SRS) transmitted from the UE or other pilot signal) . Based on the assigned rank, the base station may then transmit CSI-RSs with separate C-RS sequences for each layer to provide for multi-layer channel estimation.
  • SINR measurements e.g., based on a Sounding Reference Signal (SRS) transmitted from the UE or other pilot signal
  • SRS Sounding Reference Signal
  • the UE may measure the channel quality across layers and resource blocks and feed back the RI and a channel quality indicator (CQI) that indicates to the base station a modulation and coding scheme (MCS) to use for transmissions to the UE for use in updating the rank and assigning REs for future downlink transmissions.
  • CQI channel quality indicator
  • MCS modulation and coding scheme
  • a rank-2 spatial multiplexing transmission on a 2x2 MIMO antenna configuration will transmit one data stream from each transmit antenna 404.
  • Each data stream reaches each receive antenna 408 along a different signal path 410.
  • the receiver 406 may then reconstruct the data streams using the received signals from each receive antenna 408.
  • FIG. 5 illustrates an exemplary CSI resource mapping to support different report/measurement configurations.
  • the CSI resource mapping includes CSI report setting 502, CSI resource settings 504, CSI resource sets 506, and CSI resources 508.
  • Each CSI resource setting 504 includes one or more CSI resource sets 506, and each CSI resource set 506 includes one or more CSI resources 508.
  • a single CSI resource setting e.g., CSI resource setting 0
  • any suitable number of CSI resource settings 504 may be supported.
  • Each CSI report setting 502 may include a reportQuantity that indicates, for example, the specific CSI parameters and granularity thereof (e.g., wideband/sub-band CQI, PMI, RI, SLI, etc. ) , or L1 parameters (e.g., L1-RSRP, L1-SINR) to include in a CSI report.
  • the CSI report setting 502 may further indicate a periodicity of the CSI report.
  • the CSI report setting 502 may indicate that the report should be generated periodically, aperiodically, or semi-persistently.
  • the CSI report may be sent on the PUSCH.
  • the CSI report may be sent on the PUCCH.
  • the CSI report may be sent on the PUCCH or the PUSCH.
  • semi-persistent CSI reports sent on the PUCCH may be activated or deactivated using a medium access control (MAC) control element (MAC-CE) .
  • Semi-persistent CSI reports sent on the PUSCH may be triggered using downlink control information (DCI) scrambled with a semi-persistent CSI (SP-CP) radio network temporary identifier (SP-CP-RNTI) .
  • CSI report settings 502 may further include a respective priority and other suitable parameters.
  • Each CSI report setting 502 may be linked to a CSI resource setting 504.
  • Each CSI resource setting 504 may be associated with a particular time domain behavior of reference signals.
  • each CSI resource setting 504 may include periodic, semi-persistent, or aperiodic CSI resources 508.
  • the number of configured CSI resource sets 506 may be limited to one.
  • the CSI resource settings 504 that may be linked to a particular CSI report setting 502 may be limited by the time domain behavior of the CSI resource setting 504 and the CSI report setting 502.
  • an aperiodic CSI report setting 502 may be linked to periodic, semi-persistent, or aperiodic CSI resource settings 504.
  • a semi-persistent CSI report setting 502 may be linked to only periodic or semi-persistent CSI resource settings 504.
  • a periodic CSI report setting 502 may be linked to only a periodic CSI resource setting 504.
  • Each CSI resource set 506 may be associated with a CSI resource type.
  • CSI resource types may include non-zero-power (NZP) CSI-RS resources, SSB resources, or channel state information interference measurement (CSI-IM) resources.
  • the CSI resources 508 may include channel measurement resources (CMRs) , such as NZP CSI-RS or SSB resources, and/or interference measurement resources (IMRs) , such as CSI-IM resources.
  • CMRs channel measurement resources
  • IMRs interference measurement resources
  • Each CSI resource set 506 includes a list of CSI resources 508 of a particular CSI resource type.
  • each CSI resource set 506 may further be associated with one or more of a set of frequency resources (e.g., a bandwidth and/or OFDM symbol (s) within a slot) , a particular set of ports, a power, or other suitable parameters.
  • a set of frequency resources e.g., a bandwidth and/or OFDM symbol (s) within a slot
  • a particular set of ports e.g., a power, or other suitable parameters.
  • Each CSI resource 508 indicates the particular beam (e.g., ports) , frequency resource, and OFDM symbol on which the reference signal may be measured by the wireless communication device.
  • each CSI-RS resource 508 may indicate an RE on which a CSI-RS pilot or SSB transmitted from a particular set of ports (e.g., on a particular beam) may be measured.
  • CSI-RS resource set 0.1 includes four CSI-RS resources (CSI-RS resource 0.10, CSI-RS resource 0.11, CSI-RS resource 0.12, and CSI-RS resource 0.13) .
  • Each CSI resource 508 may further be indexed by a respective beam identifier (ID) .
  • ID beam identifier
  • the beam ID may identify not only the particular beam (e.g., ports) , but also the resources on which the reference signal may be measured.
  • the beam ID may include a CSI-RS resource indicator (CRI) or an SSB resource indicator (SSBRI) .
  • CRI CSI-RS resource indicator
  • SSBRI SSB resource indicator
  • a scheduling entity may configure a scheduled entity (e.g., UE) with one or more CSI report settings 502 and CSI resource settings 504 via, for example, radio resource control (RRC) signaling.
  • RRC radio resource control
  • the scheduling entity may configure the scheduled entity with a list of periodic CSI report settings 502 indicating the associated CSI resource set 506 that the scheduled entity may utilize to generate periodic CSI reports.
  • the scheduling entity may configure the scheduled entity with a list of aperiodic CSI report settings in a CSI-AperiodicTriggerStateList.
  • Each trigger state in the CSI-AperiodicTriggerStateList may include a list of aperiodic CSI report settings 502 indicating the associated CSI resource sets 506 for channel (and optionally interference) measurement.
  • the scheduling entity may configure the scheduled entity with a list of semi-persistent CSI report settings in a CSI-SemiPersistentOnPUSCH-TriggerStateList.
  • Each trigger state in the CSI-SemiPersistentOnPUSCH-TriggerStateList may include one CSI report setting 502 indicating the associated CSI resource set 506.
  • the scheduling entity may then trigger one or more of the aperiodic or semi-persistent trigger states using, for example, DCI.
  • a MAC-CE may be used to activate or deactivate a semi-persistent CSI report setting 502 for a CSI report sent on the PUCCH.
  • the scheduled entity may be configured with a CSI resource setting 504 having up to sixteen CSI resource sets 506.
  • each of the CSI resource sets 506 may include up to sixty-four CSI resources 508 in each set.
  • the total number of different CSI resources 508 over all the CSI resource sets 506 may be no more than 128.
  • the scheduled entity may be configured with a CSI resource setting 504 that can include up to 64 CSI resources 508 (e.g., up to 64 CSI-RS resources or up to 64 SSB resources) .
  • a CSI report can be outdated and no longer accurately reflects the channel condition between a gNB and a UE when the channel condition changes significantly after the CSI-RS transmission and before DL data transmission.
  • the UE may be moving at high speed during the time delay.
  • the time delay can be caused by channel estimation based on the CSI-RS, CSI report computation at the UE, and CSI report processing at the gNB. If the channel condition changes significantly during this time delay, the gNB cannot depend on the CSI report to predict the real-time channel condition.
  • a scheduling entity e.g., base station 108 or gNB
  • a scheduled entity e.g., UE 106
  • FIG. 6 is a diagram illustrating multiple CSI reports transmitted between a UE and a base station in a time period according to some aspects. However, simply sending more CSI reports can increase signaling overhead.
  • the base station e.g., gNB
  • the base station can configure the UE to transmit a reference CSI report 602 and one or more delta CSI reports based on CSI-RS 603 transmitted by the base station.
  • Four exemplary delta CSI reports 604, 606, 608, and 610 are illustrated in FIG. 6.
  • the delta CSI reports can be related to or based on the reference CSI report in the time domain such that the payload size of the delta CSI reports can be reduced relative to the reference CSI report.
  • the delta CSI reports enable more frequent updates of the channel condition without significantly increasing the signaling overhead.
  • the delta CSI reports can be generated based on the reference CSI report 602 using certain differential functions or any suitable time domain functions to reduce the data payload or size of the delta CSI reports.
  • a differential function can determine a CSI component (e.g., RI, CQI, L1-RSRP, and PMI) of a delta CSI report based on a difference between the same CSI component and one or more components of a reference CSI report that is earlier in time than the delta CSI report.
  • a reference CSI report can be generated without depending on another CSI report that is earlier in time. Reducing the size of the delta CSI reports enables the UE to transmit multiple CSI reports without increasing overhead significantly.
  • one or more components of a delta CSI report can be generated based on one or more components (e.g., RI, CQI, L1-RSRP, and PMI) of a reference CSI report using certain differential functions such that the payload size of the delta CSI report can be smaller than the reference CSI report.
  • components e.g., RI, CQI, L1-RSRP, and PMI
  • CQI Differential Channel Quality Information
  • FIG. 7 is a diagram illustrating a process 700 of generating CQI values of a delta CSI report (e.g., delta CSI reports 604 to 610 of FIG. 6) using differential functions according to some aspects.
  • Process 700 may be performed by any of the UE illustrated in FIGs. 1, 2, and 6.
  • a base station may configure a UE to report a wideband CQI and one or more sub-band CQIs (sub-band CQI 1 to sub-band CQI n) in a reference CSI report 702.
  • the UE can include the values for the wideband CQI and sub-band CQIs for time T0 in the reference CSI report 702.
  • Each sub-band CQI value can be determined by quantizing (e.g., quantization operator Q 704 in FIG. 7) the difference between the sub-band CQI and the wideband CQI to generate the corresponding CQI value in the CSI report 702.
  • the wideband CQI can be subtracted from the sub-band CQI 1, and the difference is quantized to generate the corresponding sub-band CQI value (e.g., value 1) in the reference CSI report 702.
  • An exemplary quantization table 706 is illustrated in FIG. 7 that can be used for quantizing or constraining the sub-band CQI values.
  • the UE can generate a delta CSI report 708 including wideband CQI and sub-bands CQIs for time T1 based on at least in part the reference CSI report 702 using certain differential functions.
  • the wideband CQI value in the delta CSI report 708 can be based on the wideband CQI of time T1 and the wideband CQI value (A_0) of the reference CSI report 702; and the sub-band CQI values in the delta CSI report 708 can be based on the sub-band CQIs at T1 and the respective sub-band CQI values in the reference CSI report 702.
  • the wideband CQI value (value 0) of the delta CSI report 708 can be determined by quantizing (e.g., quantization operator Q 710) the difference between the wideband CQI of T1 and the wideband CQI value (e.g., W or A_0) in the reference CSI report 702.
  • the quantization 710 may be performed based on the quantization table 706.
  • the sub-band CQI value (e.g., value 1) of the delta CSI report 708 can be determined by a certain differential function based on the sub-band CQI at T1 and wideband CQI and sub-band CQI at T1.
  • the sub-band CQI value (e.g., value 1) of the reference CSI report 702 is dequantized 714 using a predetermined rule.
  • the dequantization 714 may convert the sub-band CQI value in the CSI report back to the original sub-band CQI value or a similar value at T0.
  • a sum (e.g., A_1) of the dequantized sub-band CQI value and the wideband CQI value (A_0) is used in a differential function 716 to determine the sub-band CQI value (e.g., value 1) in the delta CSI report 708.
  • the output of the differential function 716 is quantized 718 (e.g., using quantization operation Q’ in FIG. 7) to generate the sub-band CQI value (e.g., value 1) of the delta CSI report 708.
  • An exemplary quantization table 720 that can be used for the quantization 718 is illustrated in FIG . 7.
  • Similar processes can be used to determine the other sub-band CQI values (e.g., value 1 to value n) in the delta CSI report 708 based on the wideband CQI, sub-band CQIs of T0, and sub-band CQIs of T1.
  • the bit size or length of the CQI fields in the delta CSI report can be reduced, thus reducing signaling overhead in CSI reporting using the delta CSI report.
  • FIG. 8 is a diagram illustrating another process 800 of generating CQI values of a delta CSI report (e.g., CSI reports 604 to 610 of FIG. 6) using differential functions according to some aspects.
  • Process 800 may be performed by any of the UEs illustrated in FIGs. 1, 2, and 6.
  • a base station e.g., gNB
  • the UE can include the CQI values (e.g., value 0 to value n) for the wideband CQI and sub-band CQIs of T0 in the reference CSI report 802.
  • Each sub-band CQI value in the report 802 can be determined by quantizing (e.g., using quantization operator Q 804 in FIG. 8) the difference between the sub-band CQI and the wideband CQI. For example, the wideband CQI is subtracted from the sub-band CQI 1, and the difference is quantized to generate the corresponding sub-band CQI value (e.g., value 1) in the reference CSI report 802.
  • An exemplary quantization table 806 is illustrated in FIG. 8 that can be used for quantizing the sub-band CQI values.
  • the UE can generate a delta CSI report 808 including the wideband CQI and sub-band CQIs for time T1 (after T0) based on the CSI-RS and the reference CSI report 802 using certain differential functions.
  • the wideband CQI value in the delta CSI report 808 of T1 can be based on the wideband CQI of time T1 and the wideband CQI value (A_0) of T0 from the reference CSI report 802.
  • the sub-band CQI values (e.g., value 1 to value n) in the delta CSI report 808 are based on the sub-band CQIs at T1 and the wideband CQI value of the reference CSI report 802.
  • the wideband CQI value (value 0) of the delta CSI report 808 can be determined by quantizing 810 the difference between the wideband CQI at T1 and the wideband CQI value (e.g., W or A_0) of the reference CSI report 802.
  • the quantization 810 may be based on the quantization table 806.
  • the sub-band CQI value (e.g., value 1 to value n) of the delta CSI report 808 can be determined based on a difference between the sub-band CQI of T1 and the wideband CQI value of the reference CSI report 802.
  • the wideband CQI value (A_0) of the reference CSI report 802 can be subtracted (e.g., differential function 812) from sub-band CQI 1 to determine the value 1 in the delta CSI report 808.
  • the output of the differential function 812 can be quantized or constrained (e.g., using quantization operation Q’ 814 in FIG. 8) to generate the sub-band CQI value (e.g., value 1) of the delta CSI report 808.
  • An exemplary quantization table 816 that can be used for the quantization 814 is illustrated in FIG . 8.
  • Similar processes can be used to determine the other sub-band CQI values (e.g., value 1 to value n) in the delta CSI report 808 based on the wideband CQI of T0 and sub-band CQIs of T1.
  • the bit size or length of the CQI values in the delta CSI report can be reduced, thus reducing signaling overhead in CSI reporting.
  • a delta CSI report may include a differential PMI to reduce the payload size (e.g., bit length) of the delta CSI report relative to a reference CSI report.
  • a reference CSI report e.g., CSI report 602 of FIG. 6
  • a differential PMI 904 may include, for example, differential coefficients (e.g., i 1, 1 , i 1, 2 ) and non-differential (regular) coefficients (e.g., i 1, 3 , i 1,4 , i 2, 1 , and i 2, 2 ) .
  • the differential coefficients can be represented using fewer bits than non-differential coefficients such that the differential PMI can have a smaller data size than the PMI of a reference CSI report.
  • differential coefficients e.g., i 1, 1 , i 1, 2
  • differential coefficients can be determined using a circular differential function.
  • a differential PMI can include one or more differential coefficients (e.g., i 1, 1 , i 1, 2 , i 1, 3 , i 1, 4 , i 2, 1 , and i 2, 2 ) .
  • a differential PMI can include fixed coefficients i 1, 1 , i 1, 2 and one or more differential coefficients i 1, 3 , i 1, 4 , i 2, 1 , i 2, 2 and/or other PMI coefficients.
  • FIG. 10 is a drawing conceptually illustrating eType-II PMI 1002 and differential PMI 1004 according to some aspects.
  • the PMI 1002 has various coefficients for, for example, beam indices (i 1, 1 , i 1, 2 ) , frequency domain indices (i 1, 5 , i 1, 6 ) , amplitude coefficient indicators (i 2, 3 , i 2, 4 ) , phase coefficient indicators of each layer (i 2, 5 ) , amplitude/phase report indicators (i 1, 7 ) , and strongest coefficient of each layer (i 1, 8 ) .
  • the differential PMI 1004 may include, for example, differential coefficients (e.g., i 1, 1 , i 1, 2 , i 1, 5 , i 1, 6 ) and non-differential coefficients (e.g., i 2, 3 , i 2, 4 , i 2, 5 , i 1, 7 , i 1, 8 ) .
  • the differential coefficients i 1, 1 , i 1, 2 , i 1, 5 , i 1, 6 can be determined using a circular differential function as described above.
  • differential coefficients i 1, 1 , i 1, 2 , i 1, 5 , i 1, 6 can be quantized or constrained (e.g., 2 bit quantization) to reduce their bit size in the delta CSI report.
  • a differential PMI can include one or more differential coefficients, for example, i 1, 1 , i 1, 2 , i 1, 5 , i 1, 6 i 2, 3 , i 2, 4 , i 2, 5 , i 1, 7 , and i 1, 8 .
  • a differential PMI can include fixed coefficients i 1, 1 , i 1, 2 , i 1, 5 , i 1, 6 and one or more differential coefficients i 2, 3 , i 2, 4 , i 2, 5 , i 1, 7 , and i 1, 8 and/or other coefficients.
  • a scheduling entity e.g., gNB or base station
  • can configure e.g., using RRC or DCI signaling
  • the UE can report different PMIs coefficients using different periodicities.
  • a gNB can configure a UE to report multiple CSI-reports (e.g., reference CSI report 602 and one or more delta CSI reports) .
  • the UE can transmit a reference CSI report that is followed by multiple delta CSI reports (e.g., delta CSI reports 604, 606, 608, and 610) .
  • the UE can use a longer periodicity for reporting certain PMI coefficients, for example, in a Type-I PMI and Type II PMI.
  • the UE can include PMI coefficients for beam indices (e.g., i 1, 1 and i 1, 2 ) in the reference CSI report 602, but not in one or more delta CSI reports.
  • the UE can use a longer periodicity for reporting certain PMI coefficients of a eType-II PMI.
  • the UE can include PMI coefficients i 1, 1 , i 1, 2 , i 1, 5 , i 1, 6 in the reference CSI report 602, but not in the delta CSI reports.
  • the scheduling entity/UE can determine the non-reported PMI coefficients (e.g., i 1, 1 , i 1, 2 , i 1, 5 , i 1, 6 ) of a PMI based on other coefficients included in the same PMI using a predetermined rule available to the UE/scheduling entity.
  • the predetermined rule can be defined in a communication standing (e.g., 5G NR) governing the communication between the scheduling entity and the UE.
  • the scheduling entity can configure the CSI reports using persistent or semi-persistent scheduling (e.g., RRC) and trigger the reference CSI report and/or delta CSI reports using dynamic signaling (e.g., DCI) .
  • a UE can send channel state feedback (CSF) (e.g., CSI reports 602 to 610 of FIG. 6) in uplink control information (UCI) .
  • CSF may include various CSI fields for a reference CSI report and/or delta CSI reports.
  • CSF can include various information that can indicate channel condition, for example, CRI, RI, LI, PMI, CQI, SSBRI, RSRP, SINR, etc. for a reference CSI report.
  • FIG. 11 is a drawing conceptually illustrating some information carried by a CSF 1100 according to some aspects.
  • the CSF 1100 may include CSI fields for a delta CSI report, for example, differential CRI (dCRI) 1102, differential RI (dRI) 1104, differential PMI (dPMI) 1106, differential QCI (dQCI) 1108, and differential LI (dLI) 1110.
  • the dCRI 1102 field can be determined based on the CRI of a reference CSI report using a differential function.
  • the dRI 1104 field can be determined based on the RI of a reference CSI report using a differential function.
  • the dPMI field 1106 can be determined based on the PMI of a reference CSI report using a differential function.
  • the dCQI field 1108 can be determined based on the CQI of a reference CSI report using a differential function.
  • the dLI field 1110 can be determined based on the LI of a reference CSI report using a differential function.
  • the UE can determine the values of dCRI, dRI, dPMI, dQCI, and dLI using differential processes similar to those described above in relation to FIGs. 6–10.
  • the base station can configure the UE to use various CSF formats to transmit a reference CSI report and/or one or more delta reference CSI reports.
  • the UE can transmit a delta CSI report individually or together with a reference CSI report in the same UCI.
  • the CSI fields can be arranged in the order of dCRI, dRI, dLI, zero padding (if needed) , dPMI, and dCQI.
  • the CSI fields can be arranged in the order of CRI, dCRI, RI, dRI, LI, dLI, zero padding (if needed) , PMI, dPMI, CQI, and dCQI.
  • the specific order of the above CSI fields may improve the processing time or efficiency of the CSI reports.
  • FIG. 12 is a block diagram illustrating an example of a hardware implementation for a scheduling entity 1200 employing a processing system 1214.
  • the scheduling entity 1200 may be a base station or gNB as illustrated in any one or more of FIGs. 1, 2, and/or 6.
  • the scheduling entity 1200 may be implemented with a processing system 1214 that includes one or more processors 1204.
  • processors 1204 include microprocessors, microcontrollers, digital signal processors (DSPs) , field programmable gate arrays (FPGAs) , programmable logic devices (PLDs) , state machines, gated logic, discrete hardware circuits, and other suitable hardware configured to perform the various functionality described throughout this disclosure.
  • DSPs digital signal processors
  • FPGAs field programmable gate arrays
  • PLDs programmable logic devices
  • state machines gated logic, discrete hardware circuits, and other suitable hardware configured to perform the various functionality described throughout this disclosure.
  • the scheduling entity 1200 may be configured to perform any one or more of the functions described herein. That is, the processor 1204, as utilized in a scheduling entity 1200, may be used to implement any one or more of the processes and procedures described below and illustrated in FIG. 13.
  • the processor 1204 may in some instances be implemented via a baseband or modem chip and in other implementations, the processor 1204 may include a number of devices distinct and different from a baseband or modem chip (e.g., in such scenarios as may work in concert to achieve examples discussed herein) . And as mentioned above, various hardware arrangements and components outside of a baseband modem processor can be used in implementations, including RF-chains, power amplifiers, modulators, buffers, interleavers, adders/summers, etc.
  • the processing system 1214 may be implemented with a bus architecture, represented generally by the bus 1202.
  • the bus 1202 may include any number of interconnecting buses and bridges depending on the specific application of the processing system 1214 and the overall design constraints.
  • the bus 1202 communicatively couples together various circuits including one or more processors (represented generally by the processor 1204) , a memory 1205, and computer-readable media (represented generally by the computer-readable medium 1206) .
  • the bus 1202 may also link various other circuits such as timing sources, peripherals, voltage regulators, and power management circuits, which are well known in the art, and therefore, will not be described any further.
  • a bus interface 1208 provides an interface between the bus 1202 and a transceiver 1210.
  • the transceiver 1210 provides a communication interface or means for communicating with various other apparatus over a transmission medium.
  • a user interface 1212 e.g., keypad, display, speaker, microphone, joystick
  • a user interface 1212 is optional, and may be omitted in some examples, such as a base station.
  • the processor 1204 is responsible for managing the bus 1202 and general processing, including the execution of software stored on the computer-readable medium 1206.
  • the software when executed by the processor 1204, causes the processing system 1214 to perform the various functions described below for any particular apparatus.
  • the computer-readable medium 1206 and the memory 1205 may also be used for storing data that is manipulated by the processor 1204 when executing software.
  • One or more processors 1204 in the processing system may execute software.
  • Software shall be construed broadly to mean instructions, instruction sets, code, code segments, program code, programs, subprograms, software modules, applications, software applications, software packages, routines, subroutines, objects, executables, threads of execution, procedures, functions, etc., whether referred to as software, firmware, middleware, microcode, hardware description language, or otherwise.
  • the software may reside on a computer-readable medium 1206.
  • the computer-readable medium 1206 may be a non-transitory computer-readable medium.
  • a non-transitory computer-readable medium includes, by way of example, a magnetic storage device (e.g., hard disk, floppy disk, magnetic strip) , an optical disk (e.g., a compact disc (CD) or a digital versatile disc (DVD) ) , a smart card, a flash memory device (e.g., a card, a stick, or a key drive) , a random access memory (RAM) , a read only memory (ROM) , a programmable ROM (PROM) , an erasable PROM (EPROM) , an electrically erasable PROM (EEPROM) , a register, a removable disk, and any other suitable medium for storing software and/or instructions that may be accessed and read by a computer.
  • a magnetic storage device e.g., hard disk, floppy disk, magnetic strip
  • an optical disk e.g., a compact disc (CD) or a digital versatile disc (DVD)
  • the computer-readable medium 1206 may reside in the processing system 1214, external to the processing system 1214, or distributed across multiple entities including the processing system 1214.
  • the computer-readable medium 1206 may be embodied in a computer program product.
  • a computer program product may include a computer-readable medium in packaging materials.
  • the processor 1204 may include circuitry configured for various functions, including, for example, channel state estimation and feedback.
  • the circuitry may be configured to implement one or more of the functions described below in relation to FIG. 13.
  • the processor 1204 may include communication and processing circuitry 1240 configured for various functions, including for example communicating with a network core (e.g., a 5G core network) , scheduled entities (e.g., UE) , or any other entity, such as, for example, local infrastructure or an entity communicating with the scheduling entity 1200 via the Internet, such as a network provider.
  • the communication and processing circuitry 1240 may include one or more hardware components that provide the physical structure that performs processes related to wireless communication (e.g., signal reception and/or signal transmission) and signal processing (e.g., processing a received signal and/or processing a signal for transmission) .
  • the communication and processing circuitry 1240 may include one or more transmit/receive chains.
  • the communication and processing circuitry 1240 may be configured to receive and process uplink traffic and uplink control messages (e.g., similar to uplink traffic 116 and uplink control 118 of FIG. 1) , transmit and process downlink traffic and downlink control messages (e.g., similar to downlink traffic 112 and downlink control 114) .
  • the communication and processing circuitry 1240 may further be configured to execute communication and processing software 1252 stored on the computer-readable medium 1206 to implement one or more functions described herein.
  • the communication and processing circuitry 1240 may obtain information from a component of the wireless communication device 1200 (e.g., from the transceiver 1210 that receives the information via radio frequency signaling or some other type of signaling suitable for the applicable communication medium) , process (e.g., decode) the information, and output the processed information.
  • the communication and processing circuitry 1240 may output the information to another component of the processor 1204, to the memory 1205, or to the bus interface 1208.
  • the communication and processing circuitry 1240 may receive one or more of signals, messages, other information, or any combination thereof.
  • the communication and processing circuitry 1240 may receive information via one or more channels.
  • the communication and processing circuitry 1240 may include functionality for a means for receiving.
  • the communication and processing circuitry 1240 may include functionality for a means for processing, including a means for demodulating, a means for decoding, etc.
  • the communication and processing circuitry 1240 may obtain information (e.g., from another component of the processor 1204, the memory 1205, or the bus interface 1208) , process (e.g., modulate, encode, etc. ) the information, and output the processed information.
  • the communication and processing circuitry 1240 may output the information to the transceiver 1210 (e.g., that transmits the information via radio frequency signaling or some other type of signaling suitable for the applicable communication medium) .
  • the communication and processing circuitry 1240 may send one or more of signals, messages, other information, or any combination thereof.
  • the communication and processing circuitry 1240 may send information via one or more channels.
  • the communication and processing circuitry 1240 may include functionality for a means for sending (e.g., a means for transmitting) . In some examples, the communication and processing circuitry 1240 may include functionality for a means for generating, including a means for modulating, a means for encoding, etc.
  • the processor 1204 may include channel state information circuitry 1242 configured for various functions, for example, generating reference signals (e.g., CSI-RS) and processing CSI report for channel estimation and measurement.
  • the channel state information circuitry 1242 can be configured to allocate resources (e.g., time, frequency, and spatial references) for reference signals (e.g., CSI-RS) transmission and configure a UE to estimate and report the channel condition based on the reference signals.
  • the channel state information circuitry 1242 can be configured to process CSI reports, for example, a reference CSI report and one or more delta CSI reports.
  • the channel state information circuitry 1242 may further be configured to execute channel state information software 1254 stored on the computer-readable medium 1206 to implement one or more functions described herein.
  • FIG. 13 is a flow chart illustrating an exemplary process 1300 for channel state feedback in accordance with some aspects of the present disclosure. As described below, some or all illustrated features may be omitted in a particular implementation within the scope of the present disclosure, and some illustrated features may not be required for all implementations. In some examples, the process 1300 may be carried out by the scheduling entity 1200 illustrated in FIG. 12. In some examples, the process 1300 may be carried out by any suitable apparatus or means for carrying out the functions or algorithm described below.
  • a scheduling entity e.g., gNB transmits a first channel state information reference signal (CSI-RS) to a UE.
  • the communication and processing circuitry 1240 can provide a means to transmit the first CSI-RS using the transceiver 1210.
  • the first CSI-RS may be the CSI-RS 603 of FIG. 6 or any suitable reference signals for channel estimation.
  • the CSI-RS can be used for measuring the channel quality between the scheduling entity and the UE.
  • the channel state information circuitry 1242 can provide a means to prepare and allocate resources (e.g., time, frequency, and spatial resources) for the transmission of the first CSI-RS.
  • the scheduling entity receives a first CSI report based on the first CSI-RS from the UE.
  • the communication and processing circuitry 1240 can provide a means to receive the first CSI report using the transceiver 1210.
  • the first CSI report may be a reference or full CSI report (e.g., reference CSI report 602 of FIG. 6) as described above.
  • the first CSI report can include one or more first CSI components, for example, CRI, RI, LI, PMI, and CQI, based on the first CSI-RS.
  • the scheduling entity transmits a second CSI-RS to the UE.
  • the communication and processing circuitry 1240 can provide a means to transmit the second CSI-RS after the first CSI-RS.
  • the second CSI-RS may be the CSI-RS 603 of FIG. 6.
  • the second CSI-RS enables the UE to perform channel estimation on the wireless channel between the scheduling entity and the UE.
  • the channel state information circuitry 1242 can provide a means to prepare and allocate resources (e.g., time, frequency, and spatial resources) for the transmission of reference signals, for example, the second CSI-RS.
  • the scheduling entity receives a second CSI report based on the second CSI-RS and the first CSI report from the UE.
  • the first CSI report and the second CSI report are related in the time domain.
  • the second CSI report can include one or more second CSI components derived at least in part from one or more first CSI components of the first CSI report.
  • the communication and processing circuitry 1240 can provide a means to receive the second CSI report via the transceiver 1210.
  • the second CSI report may be a delta CSI report (e.g., delta CSI report 604 of FIG. 6) .
  • the second CSI report can include one or more second CSI components, for example, dCRI, dRI, dLI, dPMI, and dCQI, based on the second CSI-RS and at least in part on one or more first CSI components, for example, CRI, RI, LI, PMI, and CQI.
  • the channel state information circuitry 1242 can provide a means to estimate the channel using both the first CSI report and the second CSI report.
  • the apparatus 1200 for wireless communication includes means for performing the above described processes of FIG. 13.
  • the aforementioned means may be the processor 1204 shown in FIG. 12 configured to perform the functions recited by the aforementioned means.
  • the aforementioned means may be a circuit or any apparatus configured to perform the functions recited by the aforementioned means.
  • circuitry included in the processor 1204 is merely provided as an example, and other means for carrying out the described functions may be included within various aspects of the present disclosure, including but not limited to the instructions stored in the computer-readable storage medium 1206, or any other suitable apparatus or means described in any one of the FIGs. 1, 2, and/or 6, and utilizing, for example, the processes and/or algorithms described herein in relation to FIG. 13.
  • FIG. 14 is a conceptual diagram illustrating an example of a hardware implementation for an exemplary scheduled entity 1400 employing a processing system 1414.
  • an element, or any portion of an element, or any combination of elements may be implemented with a processing system 1414 that includes one or more processors 1404.
  • the scheduled entity 1400 may be a user equipment (UE) as illustrated in any one or more of FIGs. 1, 2, and/or 6.
  • UE user equipment
  • the processing system 1414 may be substantially the same as the processing system 1214 illustrated in FIG. 12, including a bus interface 1408, a bus 1402, memory 1405, a processor 1404, and a computer-readable medium 1406.
  • the scheduled entity 1400 may include a user interface 1412 and a transceiver 1410 substantially similar to those described above in FIG. 12. That is, the processor 1404, as utilized in a scheduled entity 1400, may be used to implement any one or more of the processes described below and illustrated in FIG. 15.
  • the processor 1404 may include communication and processing circuitry 1440 configured for various functions, including for example communicating with a scheduling entity (e.g., base station, gNB) .
  • the communication and processing circuitry 1440 may include one or more hardware components that provide the physical structure that performs processes related to wireless communication (e.g., signal reception and/or signal transmission) and signal processing (e.g., processing a received signal and/or processing a signal for transmission) .
  • the communication and processing circuitry 1440 may include one or more transmit/receive chains.
  • the communication and processing circuitry 1440 may be configured to transmit and process uplink traffic and uplink control messages (e.g., similar to uplink traffic 116 and uplink control 118 of FIG.
  • the communication and processing circuitry 1440 may further be configured to execute communication and processing software 1452 stored on the computer-readable medium 1406 to implement one or more functions described herein.
  • the communication and processing circuitry 1440 may obtain information from a component of the wireless communication device 1400 (e.g., from the transceiver 1410 that receives the information via radio frequency signaling or some other type of signaling suitable for the applicable communication medium) , process (e.g., decode) the information, and output the processed information.
  • the communication and processing circuitry 1440 may output the information to another component of the processor 1404, to the memory 1405, or to the bus interface 1408.
  • the communication and processing circuitry 1440 may receive one or more of signals, messages, other information, or any combination thereof.
  • the communication and processing circuitry 1440 may receive information via one or more channels.
  • the communication and processing circuitry 1440 may include functionality for a means for receiving.
  • the communication and processing circuitry 1440 may include functionality for a means for processing, including a means for demodulating, a means for decoding, etc.
  • the communication and processing circuitry 1440 may obtain information (e.g., from another component of the processor 1404, the memory 1405, or the bus interface 1408) , process (e.g., modulate, encode, etc. ) the information, and output the processed information.
  • the communication and processing circuitry 1440 may output the information to the transceiver 1410 (e.g., that transmits the information via radio frequency signaling or some other type of signaling suitable for the applicable communication medium) .
  • the communication and processing circuitry 1440 may send one or more of signals, messages, other information, or any combination thereof.
  • the communication and processing circuitry 1440 may send information via one or more channels.
  • the communication and processing circuitry 1440 may include functionality for a means for sending (e.g., a means for transmitting) . In some examples, the communication and processing circuitry 1440 may include functionality for a means for generating, including a means for modulating, a means for encoding, etc.
  • the processor 1404 may include channel state feedback circuitry 1442 configured for various functions, for example, measuring and estimating channel condition based on reference signals (e.g., CSI-RS) transmitted by the scheduling entity.
  • the channel state feedback circuitry 1442 can generate multiple time-domain related CSI reports, for example, a reference CSI report and one or more delta CSI reports as described above in relation to FIGs. 6–11.
  • the channel state feedback circuitry 1442 can generate a delta CSI report based on a reference CSI report using a differential function.
  • the channel state feedback circuitry 1442 can generate a delta CSI report including dCRI, dRI, dPMI, dQCI, and/or dLI.
  • the channel state feedback circuitry 1442 may further be configured to execute channel state feedback software 1454 stored on the computer-readable medium 1406 to implement one or more functions described herein.
  • FIG. 15 is a flow chart illustrating an exemplary process 1500 for channel state feedback in accordance with some aspects of the present disclosure. As described below, some or all illustrated features may be omitted in a particular implementation within the scope of the present disclosure, and some illustrated features may not be required for all implementations. In some examples, the process 1500 may be carried out by the scheduled entity 1400 illustrated in FIG. 14. In some examples, the process 1500 may be carried out by any suitable apparatus or means for carrying out the functions or algorithm described below.
  • a scheduled entity receives a first CSI-RS from a scheduling entity (e.g., gNB) .
  • the communication and processing circuitry 1440 can provide a means to receive the first CSI-RS using the transceiver 1410.
  • the first CSI-RS may be the CSI-RS 603 of FIG. 6 or any reference signal suitable for channel estimation.
  • the scheduled entity can measure or estimate a wireless channel between the scheduled entity and the scheduling entity.
  • the channel state feedback circuitry 1442 can provide a means to estimate the channel using the first CSI-RS and generate a CSI report to provide channel state feedback (CSF) to the scheduling entity.
  • CSF channel state feedback
  • the scheduled entity transmits a first CSI report based on the first CSI-RS to the scheduling entity.
  • the communication and processing circuitry 1440 can provide a means to transmit the first CSI report using the transceiver 1410.
  • the first CSI report may be a reference CSI report (e.g., reference CSI report 602 of FIG. 6) .
  • the first CSI report can include one or more first CSI components, for example, CRI, RI, LI, PMI, and CQI, based on the first CSI-RS.
  • the scheduled entity receives a second CSI-RS from the scheduling entity.
  • the communication and processing circuitry 1440 can provide a means to receive the second CSI-RS.
  • the second CSI-RS may be the CSI-RS 603 of FIG. 6.
  • the channel state feedback circuitry 1442 can provide a means to estimate the wireless channel between the scheduling entity and the scheduled entity using the second CSI-RS and generate a second CSI report to provide channel state feedback to the scheduling entity.
  • the scheduled entity can transmit a second CSI report based on the second CSI-RS and the first CSI report.
  • the second CSI report can include one or more second CSI components derived at least in part from the one or more first CSI components.
  • the communication and processing circuitry 1440 can provide a means to transmit the second CSI report.
  • the second CSI report may be a delta CSI report (e.g., delta CSI report 604 of FIG. 6) .
  • the second CSI report can include one or more second CSI components, for example, dCRI, dRI, dLI, dPMI, and dCQI, based on the second CSI-RS and at least in part on one or more first CSI components (e.g., CRI, RI, LI, PMI, CQI) .
  • the channel state feedback circuitry 1442 can provide a means to determine the one or more second CSI components based on at least in part from the one or more first CSI components.
  • the scheduled entity can determine one or more of dCRI, dRI, dLI, dPMI, and dCQI based on a differential function on one or more of the first CSI components.
  • the apparatus 1400 for wireless communication includes means for performing the above described processes of FIG. 15.
  • the aforementioned means may be the processor 1404 shown in FIG. 14 configured to perform the functions recited by the aforementioned means.
  • the aforementioned means may be a circuit or any apparatus configured to perform the functions recited by the aforementioned means.
  • circuitry included in the processor 1404 is merely provided as an example, and other means for carrying out the described functions may be included within various aspects of the present disclosure, including but not limited to the instructions stored in the computer-readable storage medium 1406, or any other suitable apparatus or means described in any one of the FIGs. 1, 2, and/or 6, and utilizing, for example, the processes and/or algorithms described herein in relation to FIG. 15.
  • a method for wireless communications by a user equipment comprises: receiving a first channel state information reference signal (CSI-RS) from a scheduling entity; transmitting a first CSI report based on the first CSI-RS, the first CSI report comprising one or more first CSI components; receiving a second CSI-RS from the scheduling entity; and transmitting a second CSI report based on the second CSI-RS and the first CSI report, the second CSI report comprising one or more second CSI components derived at least in part from the one or more first CSI components.
  • CSI-RS channel state information reference signal
  • the one or more first CSI components comprise one or more first channel quality information (CQI) values; and the one or more second CSI components comprise one or more second CQI values derived from the one or more first CQI values.
  • CQI channel quality information
  • the method further comprises: deriving the one or more second CQI values based on a difference between the one or more first CQI values and the one or more second CQI values.
  • the one or more first CSI components comprise a first precoding matrix indicator (PMI) based on the first CSI-RS; and the one or more second CSI components comprise a second PMI based on the second CSI-RS and the first PMI.
  • PMI precoding matrix indicator
  • first PMI and the second PMI have different periodicities with respect to one or more coefficients respectively included in the first PMI and the second PMI.
  • the first CSI report comprises channel quality information (CQI) , precoding matrix indicator (PMI) , CSI-RS resource indicator (CRI) , layer indicator (LI) , and rank indicator (RI)
  • the second CSI report comprises differential CQI (dCQI) , differential PMI (dPMI) , differential CRI (dCRI) , differential LI (dLI) , and differential RI (dRI)
  • the method further comprises transmitting uplink control information (UCI) comprising: dCRI, dRI, dLI, zero padding, dPMI, and dCQI arranged in sequence in the UCI; or CRI, dCRI, RI, dRI, LI, dLI, zero padding, PMI, dPMI, CQI, and dCQI arranged in sequence in the UCI.
  • UCI uplink control information
  • a method for wireless communications by a scheduling entity comprises: transmitting a first channel state information reference signal (CSI-RS) to a user equipment (UE) ; receiving, from the UE, a first CSI report based on the first CSI-RS, the first CSI report comprising one or more first CSI components; transmitting a second CSI-RS to the UE; and receiving, from the UE, a second CSI report based on the second CSI-RS and the first CSI report, the second CSI report comprising one or more second CSI components derived at least in part from the one or more first CSI components.
  • CSI-RS channel state information reference signal
  • UE user equipment
  • the one or more first CSI components comprise one or more first channel quality information (CQI) values; and the one or more second CSI components comprise one or more second CQI values derived from the one or more first CQI values.
  • CQI channel quality information
  • the method further comprises: deriving the one or more second CQI values based on a difference between the one or more first CQI values and the one or more second CQI values.
  • the one or more first CSI components comprise a first precoding matrix indicator (PMI) based on the first CSI-RS; and the one or more second CSI components comprise a second PMI based on the second CSI-RS and the first PMI.
  • PMI precoding matrix indicator
  • a fourteenth aspect alone or in combination with the thirteenth aspect, wherein at least one coefficient of the second PMI is derived from one or more coefficients of the first PMI using a differential function.
  • first PMI and the second PMI have different periodicities with respect to one or more coefficients respectively included in the first PMI and the second PMI.
  • a user equipment (UE) for wireless communication includes a transceiver configured for wireless communication, a memory, and a processor coupled with the transceiver and the memory.
  • the processor and the memory are configured to: receive a first channel state information reference signal (CSI-RS) from a scheduling entity; transmit a first CSI report based on the first CSI-RS, the first CSI report comprising one or more first CSI components; receive a second CSI-RS from the scheduling entity; and transmit a second CSI report based on the second CSI-RS and the first CSI report, the second CSI report comprising one or more second CSI components derived at least in part from the one or more first CSI components.
  • CSI-RS channel state information reference signal
  • the one or more first CSI components comprise one or more first channel quality information (CQI) values; and the one or more second CSI components comprise one or more second CQI values derived from the one or more first CQI values.
  • CQI channel quality information
  • processor and the memory are further configured to: derive the one or more second CQI values based on a difference between the one or more first CQI values and the one or more second CQI values.
  • the one or more first CSI components comprise a first precoding matrix indicator (PMI) based on the first CSI-RS; and the one or more second CSI components comprise a second PMI based on the second CSI-RS and the first PMI.
  • PMI precoding matrix indicator
  • first PMI and the second PMI have different periodicities with respect to one or more coefficients respectively included in the first PMI and the second PMI.
  • the first CSI report comprises channel quality information (CQI) , precoding matrix indicator (PMI) , CSI-RS resource indicator (CRI) , layer indicator (LI) , and rank indicator (RI)
  • the second CSI report comprises differential CQI (dCQI) , differential PMI (dPMI) , differential CRI (dCRI) , differential LI (dLI) , and differential RI (dRI)
  • the processor and the memory are further configured to transmit uplink control information (UCI) comprising: dCRI, dRI, dLI, zero padding, dPMI, and dCQI arranged in sequence in the UCI; or CRI, dCRI, RI, dRI, LI, dLI, zero padding, PMI, dPMI, CQI, and dCQI arranged in sequence in the UCI.
  • UCI uplink control information
  • a scheduling entity for wireless communication comprises a transceiver configured for wireless communication, a memory, and a processor coupled with the transceiver and the memory.
  • the processor and the memory are configured to: transmit a first channel state information reference signal (CSI-RS) to a user equipment (UE) ; receive, from the UE, a first CSI report based on the first CSI-RS, the first CSI report comprising one or more first CSI components; transmit a second CSI-RS to the UE; and receive, from the UE, a second CSI report based on the second CSI-RS and the first CSI report, the second CSI report comprising one or more second CSI components derived at least in part from the one or more first CSI components.
  • CSI-RS channel state information reference signal
  • the one or more first CSI components comprise one or more first channel quality information (CQI) values; and the one or more second CSI components comprise one or more second CQI values derived from the one or more first CQI values.
  • CQI channel quality information
  • processor and the memory are further configured to:derive the one or more second CQI values based on a difference between the one or more first CQI values and the one or more second CQI values.
  • the one or more first CSI components comprise a first precoding matrix indicator (PMI) based on the first CSI-RS; and the one or more second CSI components comprise a second PMI based on the second CSI-RS and the first PMI.
  • PMI precoding matrix indicator
  • first PMI and the second PMI have different periodicities with respect to one or more coefficients respectively included in the first PMI and the second PMI.
  • various aspects may be implemented within other systems defined by 3GPP, such as Long-Term Evolution (LTE) , the Evolved Packet System (EPS) , the Universal Mobile Telecommunication System (UMTS) , and/or the Global System for Mobile (GSM) .
  • LTE Long-Term Evolution
  • EPS Evolved Packet System
  • UMTS Universal Mobile Telecommunication System
  • GSM Global System for Mobile
  • Various aspects may also be extended to systems defined by the 3rd Generation Partnership Project 2 (3GPP2) , such as CDMA2000 and/or Evolution-Data Optimized (EV-DO) .
  • 3GPP2 3rd Generation Partnership Project 2
  • EV-DO Evolution-Data Optimized
  • Other examples may be implemented within systems employing IEEE 802.11 (Wi-Fi) , IEEE 802.16 (WiMAX) , IEEE 802.20, Ultra-Wideband (UWB) , Bluetooth, and/or other suitable systems.
  • Wi-Fi IEEE 802.11
  • WiMAX IEEE 8
  • the word “exemplary” is used to mean “serving as an example, instance, or illustration. ” Any implementation or aspect described herein as “exemplary” is not necessarily to be construed as preferred or advantageous over other aspects of the disclosure. Likewise, the term “aspects” does not require that all aspects of the disclosure include the discussed feature, advantage or mode of operation.
  • the term “coupled” is used herein to refer to the direct or indirect coupling between two objects. For example, if object A physically touches object B, and object B touches object C, then objects A and C may still be considered coupled to one another-even if they do not directly physically touch each other. For instance, a first object may be coupled to a second object even though the first object is never directly physically in contact with the second object.
  • circuit and “circuitry” are used broadly, and intended to include both hardware implementations of electrical devices and conductors that, when connected and configured, enable the performance of the functions described in the present disclosure, without limitation as to the type of electronic circuits, as well as software implementations of information and instructions that, when executed by a processor, enable the performance of the functions described in the present disclosure.
  • FIGs. 1–15 may be rearranged and/or combined into a single component, step, feature or function or embodied in several components, steps, or functions. Additional elements, components, steps, and/or functions may also be added without departing from novel features disclosed herein.
  • the apparatus, devices, and/or components illustrated in FIGs. 1–15 may be configured to perform one or more of the methods, features, or steps described herein.
  • the novel algorithms described herein may also be efficiently implemented in software and/or embedded in hardware.
  • “at least one of: a, b, or c” is intended to cover: a; b; c; a and b; a and c; b and c; and a, b and c. All structural and functional equivalents to the elements of the various aspects described throughout this disclosure that are known or later come to be known to those of ordinary skill in the art are expressly incorporated herein by reference and are intended to be encompassed by the claims. Moreover, nothing disclosed herein is intended to be dedicated to the public regardless of whether such disclosure is explicitly recited in the claims. No claim element is to be construed under the provisions of 35 U.S.C. ⁇ 112 (f) unless the element is expressly recited using the phrase “means for” or, in the case of a method claim, the element is recited using the phrase “step for. ”

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  • Mathematical Physics (AREA)
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Abstract

Un équipement utilisateur (UE) peut transmettre de multiples rapports d'informations d'état de canal (CSI) qui sont liés par certaines fonctions différentielles de telle sorte que le surdébit pour envoyer de multiples rapports de CSI puisse être réduit. L'UE reçoit un premier signal de référence d'informations d'état de canal (CSI-RS) provenant d'une entité de planification. L'UE transmet un premier rapport de CSI sur la base du premier CSI-RS, le premier rapport de CSI comprenant une ou plusieurs premières composantes de CSI. L'UE reçoit un second CSI-RS en provenance de l'entité de planification. L'UE transmet un second rapport de CSI sur la base du second CSI-RS et du premier rapport de CSI, le second rapport de CSI comprenant une ou plusieurs secondes composantes de CSI dérivées au moins en partie de la ou des premières composantes de CSI.
PCT/CN2021/118116 2021-09-14 2021-09-14 Rapports d'informations d'état de canal liés à un domaine temporel pour une communication sans fil WO2023039695A1 (fr)

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Citations (4)

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Publication number Priority date Publication date Assignee Title
WO2018040074A1 (fr) * 2016-09-02 2018-03-08 Huizhou Tcl Mobile Communication Co.,Ltd Procédés, stations de base, et équipements d'utilisateur pour une co-programmation mimo multiutilisateur avec mesurage d'interférence
US20180278315A1 (en) * 2017-03-23 2018-09-27 Qualcomm Incorporated Differential channel state information (csi) reporting for higher resolution csi
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WO2018040074A1 (fr) * 2016-09-02 2018-03-08 Huizhou Tcl Mobile Communication Co.,Ltd Procédés, stations de base, et équipements d'utilisateur pour une co-programmation mimo multiutilisateur avec mesurage d'interférence
US20180278315A1 (en) * 2017-03-23 2018-09-27 Qualcomm Incorporated Differential channel state information (csi) reporting for higher resolution csi
CN110582957A (zh) * 2017-05-05 2019-12-17 高通股份有限公司 用于差别信道状态信息(csi)报告的过程
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