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WO2021212502A1 - Amélioration de la configuration de ressources de gestion d'interférence d'informations d'état de canal - Google Patents

Amélioration de la configuration de ressources de gestion d'interférence d'informations d'état de canal Download PDF

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Publication number
WO2021212502A1
WO2021212502A1 PCT/CN2020/086796 CN2020086796W WO2021212502A1 WO 2021212502 A1 WO2021212502 A1 WO 2021212502A1 CN 2020086796 W CN2020086796 W CN 2020086796W WO 2021212502 A1 WO2021212502 A1 WO 2021212502A1
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WIPO (PCT)
Prior art keywords
csi
resource
configuration
computer
reference signal
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/CN2020/086796
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English (en)
Inventor
Bo Chen
Yu Zhang
Jay Kumar Sundararajan
Ruifeng MA
Pavan Kumar Vitthaladevuni
Yeliz Tokgoz
Krishna Kiran Mukkavilli
Hao Xu
Tingfang Ji
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Qualcomm Inc
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Qualcomm Inc
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Publication date
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Priority to PCT/CN2020/086796 priority Critical patent/WO2021212502A1/fr
Publication of WO2021212502A1 publication Critical patent/WO2021212502A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0053—Allocation of signalling, i.e. of overhead other than pilot signals
    • H04L5/0057—Physical resource allocation for CQI
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/0006—Assessment of spectral gaps suitable for allocating digitally modulated signals, e.g. for carrier allocation in cognitive radio
    • 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
    • H04L5/0003—Two-dimensional division
    • H04L5/0005—Time-frequency
    • H04L5/0007—Time-frequency the frequencies being orthogonal, e.g. OFDM(A) or DMT
    • H04L5/001—Time-frequency the frequencies being orthogonal, e.g. OFDM(A) or DMT the frequencies being arranged in component carriers
    • 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 signalling, i.e. of overhead other than pilot signals
    • 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 signalling, i.e. of overhead other than pilot signals
    • H04L5/0055—Physical resource allocation for ACK/NACK
    • 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
    • H04L5/0058—Allocation criteria
    • H04L5/0062—Avoidance of ingress interference, e.g. ham radio channels
    • 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]

Definitions

  • aspects of the present disclosure relate generally to wireless communication systems, and more particularly, to enhancement of channel state information-interference management (CSI-IM) resource configuration.
  • CSI-IM channel state information-interference management
  • Wireless communication networks are widely deployed to provide various communication services such as voice, video, packet data, messaging, broadcast, and the like. These wireless networks may be multiple-access networks capable of supporting multiple users by sharing the available network resources. Such networks, which are usually multiple access networks, support communications for multiple users by sharing the available network resources.
  • UTRAN Universal Terrestrial Radio Access Network
  • the UTRAN is the radio access network (RAN) defined as a part of the Universal Mobile Telecommunications System (UMTS) , a third generation (3G) mobile phone technology supported by the 3rd Generation Partnership Project (3GPP) .
  • UMTS Universal Mobile Telecommunications System
  • 3GPP 3rd Generation Partnership Project
  • multiple-access network formats include Code Division Multiple Access (CDMA) networks, Time Division Multiple Access (TDMA) networks, Frequency Division Multiple Access (FDMA) networks, Orthogonal FDMA (OFDMA) networks, and Single-Carrier FDMA (SC-FDMA) networks.
  • CDMA Code Division Multiple Access
  • TDMA Time Division Multiple Access
  • FDMA Frequency Division Multiple Access
  • OFDMA Orthogonal FDMA
  • SC-FDMA Single-Carrier FDMA
  • a wireless communication network may include a number of base stations or node Bs that can support communication for a number of user equipments (UEs) .
  • a UE may communicate with a base station via downlink and uplink.
  • the downlink (or forward link) refers to the communication link from the base station to the UE
  • the uplink (or reverse link) refers to the communication link from the UE to the base station.
  • a base station may transmit data and control information on the downlink to a UE and/or may receive data and control information on the uplink from the UE.
  • a transmission from the base station may encounter interference due to transmissions from neighbor base stations or from other wireless radio frequency (RF) transmitters.
  • RF radio frequency
  • a transmission from the UE may encounter interference from uplink transmissions of other UEs communicating with the neighbor base stations or from other wireless RF transmitters. This interference may degrade performance on both the downlink and uplink.
  • a method of wireless communication includes receiving, by a user equipment (UE) , a CSI report setting configuration, obtaining, by the UE, a channel state information –interference measurement (CSI-IM) resource configuration including quasi-colocation (QCL) assumption information associated with a reference signal for one of channel feedback or interference feedback, receiving, by the UE, the reference signal using the QCL assumption information, measuring, by the UE, interference observed with the reference signal, and transmitting, by the UE, a CSI report indicating the interference observed based on the CSI-IM resource configuration.
  • CSI-IM channel state information –interference measurement
  • QCL quasi-colocation
  • an apparatus configured for wireless communication includes means for receiving, by a UE, a CSI report setting configuration, means for obtaining, by the UE, a CSI-IM resource configuration including QCL assumption information associated with a reference signal for one of channel feedback or interference feedback, means for receiving, by the UE, the reference signal using the QCL assumption information, means for measuring, by the UE, interference observed with the reference signal, and means for transmitting, by the UE, a CSI report indicating the interference observed based on the CSI-IM resource configuration.
  • a non-transitory computer-readable medium having program code recorded thereon.
  • the program code further includes code to receive, by a UE, a CSI report setting configuration, code to obtain, by the UE, a CSI-IM resource configuration including QCL assumption information associated with a reference signal for one of channel feedback or interference feedback, code to receive, by the UE, the reference signal using the QCL assumption information, code to measure, by the UE, interference observed with the reference signal, and code to transmit, by the UE, a CSI report indicating the interference observed based on the CSI-IM resource configuration.
  • an apparatus configured for wireless communication.
  • the apparatus includes at least one processor, and a memory coupled to the processor.
  • the processor is configured to receive, by a UE, a CSI report setting configuration, to obtain, by the UE, a CSI-IM resource configuration including QCL assumption information associated with a reference signal for one of channel feedback or interference feedback, to receive, by the UE, the reference signal using the QCL assumption information, to measure, by the UE, interference observed with the reference signal, and to transmit, by the UE, a CSI report indicating the interference observed based on the CSI-IM resource configuration.
  • FIG. 1 is a block diagram illustrating details of a wireless communication system.
  • FIG. 2 is a block diagram illustrating a design of a base station and a UE configured according to one aspect of the present disclosure.
  • FIG. 3 is a block diagram illustrating example blocks executed to implement one aspect of the present disclosure.
  • FIGs. 4A-4C are block diagrams illustrating a UE configured according to aspects of the present disclosure for conducting IMR-only feedback to a base station.
  • FIG. 5 is a block diagram illustrating a UE and base station configured according to one aspect of the present disclosure for configuration of aperiodic CSI-IM resources.
  • FIG. 6 is a block diagram illustrating a UE configured according to one aspect of the present disclosure.
  • wireless communications networks This disclosure relates generally to providing or participating in authorized shared access between two or more wireless communications systems, also referred to as wireless communications networks.
  • the techniques and apparatus may be used for wireless communication networks such as code division multiple access (CDMA) networks, time division multiple access (TDMA) networks, frequency division multiple access (FDMA) networks, orthogonal FDMA (OFDMA) networks, single-carrier FDMA (SC-FDMA) networks, LTE networks, GSM networks, 5 th Generation (5G) or new radio (NR) networks, as well as other communications networks.
  • CDMA code division multiple access
  • TDMA time division multiple access
  • FDMA frequency division multiple access
  • OFDMA orthogonal FDMA
  • SC-FDMA single-carrier FDMA
  • LTE long-term evolution
  • GSM Global System for Mobile communications
  • 5G 5 th Generation
  • NR new radio
  • An OFDMA network may implement a radio technology such as evolved UTRA (E-UTRA) , IEEE 802.11, IEEE 802.16, IEEE 802.20, flash-OFDM and the like.
  • E-UTRA evolved UTRA
  • GSM Global System for Mobile Communications
  • LTE long term evolution
  • UTRA, E-UTRA, GSM, UMTS and LTE are described in documents provided from an organization named “3rd Generation Partnership Project” (3GPP)
  • cdma2000 is described in documents from an organization named “3rd Generation Partnership Project 2” (3GPP2) .
  • 3GPP 3rd Generation Partnership Project
  • 3GPP long term evolution LTE
  • UMTS universal mobile telecommunications system
  • the 3GPP may define specifications for the next generation of mobile networks, mobile systems, and mobile devices.
  • the present disclosure is concerned with the evolution of wireless technologies from LTE, 4G, 5G, NR, and beyond with shared access to wireless spectrum between networks using a collection of new and different radio access technologies or radio air interfaces.
  • 5G networks contemplate diverse deployments, diverse spectrum, and diverse services and devices that may be implemented using an OFDM-based unified, air interface.
  • further enhancements to LTE and LTE-A are considered in addition to development of the new radio technology for 5G NR networks.
  • the 5G NR will be capable of scaling to provide coverage (1) to a massive Internet of things (IoTs) with an ultra-high density (e.g., ⁇ 1M nodes/km 2 ) , ultra-low complexity (e.g., ⁇ 10s of bits/sec) , ultra-low energy (e.g., ⁇ 10+ years of battery life) , and deep coverage with the capability to reach challenging locations; (2) including mission-critical control with strong security to safeguard sensitive personal, financial, or classified information, ultra-high reliability (e.g., ⁇ 99.9999%reliability) , ultra-low latency (e.g., ⁇ 1 ms) , and users with wide ranges of mobility or lack thereof; and (3) with enhanced mobile broadband including extreme high capacity (e.g., ⁇ 10 Tbps/km 2 ) , extreme data rates (e.g., multi-Gbps rate, 100+ Mbps user experienced rates) , and deep awareness with advanced discovery and optimizations.
  • IoTs Internet of things
  • the 5G NR may be implemented to use optimized OFDM-based waveforms with scalable numerology and transmission time interval (TTI) ; having a common, flexible framework to efficiently multiplex services and features with a dynamic, low-latency time division duplex (TDD) /frequency division duplex (FDD) design; and with advanced wireless technologies, such as massive multiple input, multiple output (MIMO) , robust millimeter wave (mmWave) transmissions, advanced channel coding, and device-centric mobility.
  • TTI transmission time interval
  • MIMO massive multiple input, multiple output
  • mmWave millimeter wave
  • Scalability of the numerology in 5G NR with scaling of subcarrier spacing, may efficiently address operating diverse services across diverse spectrum and diverse deployments.
  • subcarrier spacing may occur with 15 kHz, for example over 1, 5, 10, 20 MHz, and the like bandwidth.
  • subcarrier spacing may occur with 30 kHz over 80/100 MHz bandwidth.
  • the subcarrier spacing may occur with 60 kHz over a 160 MHz bandwidth.
  • subcarrier spacing may occur with 120 kHz over a 500 MHz bandwidth.
  • the scalable numerology of the 5G NR facilitates scalable TTI for diverse latency and quality of service (QoS) requirements. For example, shorter TTI may be used for low latency and high reliability, while longer TTI may be used for higher spectral efficiency.
  • QoS quality of service
  • 5G NR also contemplates a self-contained integrated subframe design with uplink/downlink scheduling information, data, and acknowledgement in the same subframe.
  • the self-contained integrated subframe supports communications in unlicensed or contention-based shared spectrum, adaptive uplink/downlink that may be flexibly configured on a per-cell basis to dynamically switch between uplink and downlink to meet the current traffic needs.
  • an aspect disclosed herein may be implemented independently of any other aspects and that two or more of these aspects may be combined in various ways.
  • an apparatus may be implemented or a method may be practiced using any number of the aspects set forth herein.
  • such an apparatus may be implemented or such a method may be practiced using other structure, functionality, or structure and functionality in addition to or other than one or more of the aspects set forth herein.
  • a method may be implemented as part of a system, device, apparatus, and/or as instructions stored on a computer readable medium for execution on a processor or computer.
  • an aspect may comprise at least one element of a claim.
  • FIG. 1 is a block diagram illustrating an example of a wireless communications system 100 that supports configuration of quasi-co-location (QCL) information for interference measurement reporting (IMR) -only operations in accordance with aspects of the present disclosure.
  • report configuration signaling provides transmission configuration indicator (TCI) state information associated with interference measurement resources, such that the QCL information associated with the interference measurement resources may be identified without relying on the TCI state information associated with any non-zero power channel state information-reference signal (NZP CSI-RS) of channel measurement reporting, which are not paired with the interference measurement resources during IMR-only operations.
  • TCI transmission configuration indicator
  • NZP CSI-RS non-zero power channel state information-reference signal
  • the wireless communications system 100 includes base stations 105, UEs 115, and a core network 130.
  • the wireless communications system 100 may be a Long Term Evolution (LTE) network, an LTE- Advanced (LTE-A) network, an LTE-A Pro network, or NR network.
  • LTE Long Term Evolution
  • LTE-A LTE-Advance
  • LTE-A Pro LTE-A Pro
  • NR NR network
  • wireless communications system 100 may support enhanced broadband communications, ultra-reliable (e.g., mission critical) communications, low latency communications, or communications with low-cost and low-complexity devices.
  • ultra-reliable e.g., mission critical
  • Base stations 105 may wirelessly communicate with UEs 115 via one or more base station antennas.
  • Base stations 105 described herein may include or may be referred to by those skilled in the art as a base transceiver station, a radio base station, an access point, a radio transceiver, a NodeB, an eNodeB (eNB) , a next-generation NodeB or giga-NodeB (either of which may be referred to as a gNB) , a Home NodeB, a Home eNodeB, or some other suitable terminology.
  • Wireless communications system 100 may include base stations 105 of different types (e.g., macro or small cell base stations) .
  • the UEs 115 described herein may be able to communicate with various types of base stations 105 and network equipment including macro eNBs, small cell eNBs, gNBs, relay base stations, and the like.
  • Each base station 105 may be associated with a particular geographic coverage area 110 in which communications with various UEs 115 is supported. Each base station 105 may provide communication coverage for a respective geographic coverage area 110 via communication links 125, and communication links 125 between a base station 105 and a UE 115 may utilize one or more carriers. Communication links 125 shown in wireless communications system 100 may include uplink transmissions from a UE 115 to a base station 105, or downlink transmissions from a base station 105 to a UE 115. Downlink transmissions may also be referred to as forward link transmissions while uplink transmissions may also be referred to as reverse link transmissions.
  • the geographic coverage area 110 for a base station 105 may be divided into sectors making up a portion of the geographic coverage area 110, and each sector may be associated with a cell.
  • each base station 105 may provide communication coverage for a macro cell, a small cell, a hot spot, or other types of cells, or various combinations thereof.
  • a base station 105 may be movable and, therefore, provide communication coverage for a moving geographic coverage area 110.
  • different geographic coverage areas 110 associated with different technologies may overlap, and overlapping geographic coverage areas 110 associated with different technologies may be supported by the same base station 105 or by different base stations 105.
  • the wireless communications system 100 may include, for example, a heterogeneous LTE/LTE-A/LTE-A Pro or NR network in which different types of base stations 105 provide coverage for various geographic coverage areas 110.
  • the term “cell” refers to a logical communication entity used for communication with a base station 105 (e.g., over a carrier) , and may be associated with an identifier for distinguishing neighboring cells (e.g., a physical cell identifier (PCID) , a virtual cell identifier (VCID) ) operating via the same or a different carrier.
  • a carrier may support multiple cells, and different cells may be configured according to different protocol types (e.g., machine-type communication (MTC) , narrowband Internet-of-things (NB-IoT) , enhanced mobile broadband (eMBB) , or others) that may provide access for different types of devices.
  • MTC machine-type communication
  • NB-IoT narrowband Internet-of-things
  • eMBB enhanced mobile broadband
  • the term “cell” may refer to a portion of a geographic coverage area 110 (e.g., a sector) over which the logical entity operates.
  • UEs 115 may be dispersed throughout the wireless communications system 100, and each UE 115 may be stationary or mobile.
  • a UE 115 may also be referred to as a mobile device, a wireless device, a remote device, a handheld device, or a subscriber device, or some other suitable terminology, where the “device” may also be referred to as a unit, a station, a terminal, or a client.
  • a UE 115 may also be a personal electronic device such as a cellular phone (UE 115a) , a personal digital assistant (PDA) , a wearable device (UE 115d) , a tablet computer, a laptop computer (UE 115g) , or a personal computer.
  • PDA personal digital assistant
  • a UE 115 may also refer to a wireless local loop (WLL) station, an Internet-of-things (IoT) device, an Internet-of-everything (IoE) device, an MTC device, or the like, which may be implemented in various articles such as appliances, vehicles (UE 115e and UE 115f) , meters (UE 115b and UE 115c) , or the like.
  • WLL wireless local loop
  • IoT Internet-of-things
  • IoE Internet-of-everything
  • Some UEs 115 may be low cost or low complexity devices, and may provide for automated communication between machines (e.g., via machine-to-machine (M2M) communication) .
  • M2M communication or MTC may refer to data communication technologies that allow devices to communicate with one another or a base station 105 without human intervention.
  • M2M communication or MTC may include communications from devices that integrate sensors or meters to measure or capture information and relay that information to a central server or application program that can make use of the information or present the information to humans interacting with the program or application.
  • Some UEs 115 may be designed to collect information or enable automated behavior of machines. Examples of applications for MTC devices include smart metering, inventory monitoring, water level monitoring, equipment monitoring, healthcare monitoring, wildlife monitoring, weather and geological event monitoring, fleet management and tracking, remote security sensing, physical access control, and transaction-based business charging.
  • Some UEs 115 may be configured to employ operating modes that reduce power consumption, such as half-duplex communications (e.g., a mode that supports one-way communication via transmission or reception, but not transmission and reception simultaneously) . In some examples, half-duplex communications may be performed at a reduced peak rate. Other power conservation techniques for UEs 115 include entering a power saving “deep sleep” mode when not engaging in active communications, or operating over a limited bandwidth (e.g., according to narrowband communications) . In other cases, UEs 115 may be designed to support critical functions (e.g., mission critical functions) , and a wireless communications system 100 may be configured to provide ultra-reliable communications for these functions.
  • critical functions e.g., mission critical functions
  • a UE 115 may also be able to communicate directly with other UEs 115 (e.g., using a peer-to-peer (P2P) or device-to-device (D2D) protocol) .
  • P2P peer-to-peer
  • D2D device-to-device
  • One or more of a group of UEs 115 utilizing D2D communications may be within the geographic coverage area 110 of a base station 105.
  • Other UEs 115 in such a group may be outside the geographic coverage area 110 of a base station 105, or be otherwise unable to receive transmissions from a base station 105.
  • groups of UEs 115 communicating via D2D communications may utilize a one-to-many (1: M) system in which each UE 115 transmits to every other UE 115 in the group.
  • a base station 105 may facilitate the scheduling of resources for D2D communications.
  • D2D communications may be carried out between UEs 115 without the involvement of a
  • Base stations 105 may communicate with the core network 130 and with one another.
  • base stations 105 may interface with the core network 130 through backhaul links 132 (e.g., via an S1, N2, N3, or other interface) .
  • Base stations 105 may communicate with one another over backhaul links 134 (e.g., via an X2, Xn, or other interface) either directly (e.g., directly between base stations 105) or indirectly (e.g., via core network 130) .
  • the core network 130 may provide user authentication, access authorization, tracking, Internet Protocol (IP) connectivity, and other access, routing, or mobility functions.
  • the core network 130 may be an evolved packet core (EPC) , which may include at least one mobility management entity (MME) , at least one serving gateway (S-GW) , and at least one packet data network (PDN) gateway (P-GW) .
  • the MME may manage non-access stratum (e.g., control plane) functions such as mobility, authentication, and bearer management for UEs 115 served by base stations 105 associated with the EPC.
  • User IP packets may be transferred through the S-GW, which itself may be connected to the P-GW.
  • the P-GW may provide IP address allocation as well as other functions.
  • the P-GW may be connected to the network operators IP services.
  • the operators IP services may include access to the Internet, Intranet (s) , an IP multimedia subsystem (IMS) , or a packet-switched (PS) streaming service.
  • IMS
  • At least some of the network devices may include subcomponents such as an access network entity, which may be an example of an access node controller (ANC) .
  • Each access network entity may communicate with UEs 115 through a number of other access network transmission entities, which may be referred to as a radio head, a smart radio head, or a transmission/reception point (TRP) .
  • TRP transmission/reception point
  • various functions of each access network entity or base station 105 may be distributed across various network devices (e.g., radio heads and access network controllers) or consolidated into a single network device (e.g., a base station 105) .
  • Wireless communications system 100 may operate using one or more frequency bands, typically in the range of 300 megahertz (MHz) to 300 gigahertz (GHz) .
  • the region from 300 MHz to 3 GHz is known as the ultra-high frequency (UHF) region or decimeter band, since the wavelengths range from approximately one decimeter to one meter in length.
  • UHF waves may be blocked or redirected by buildings and environmental features. However, the waves may penetrate structures sufficiently for a macro cell to provide service to UEs 115 located indoors. Transmission of UHF waves may be associated with smaller antennas and shorter range (e.g., less than 100 km) compared to transmission using the smaller frequencies and longer waves of the high frequency (HF) or very high frequency (VHF) portion of the spectrum below 300 MHz.
  • HF high frequency
  • VHF very high frequency
  • Wireless communications system 100 may also operate in a super high frequency (SHF) region using frequency bands from 3 GHz to 30 GHz, also known as the centimeter band.
  • SHF region includes bands such as the 5 GHz industrial, scientific, and medical (ISM) bands, which may be used opportunistically by devices that may be capable of tolerating interference from other users.
  • ISM bands 5 GHz industrial, scientific, and medical bands
  • Wireless communications system 100 may also operate in an extremely high frequency (EHF) region of the spectrum (e.g., from 30 GHz to 300 GHz) , also known as the millimeter band.
  • EHF extremely high frequency
  • wireless communications system 100 may support millimeter wave (mmW) communications between UEs 115 and base stations 105, and EHF antennas of the respective devices may be even smaller and more closely spaced than UHF antennas. In some cases, this may facilitate use of antenna arrays within a UE 115.
  • mmW millimeter wave
  • the propagation of EHF transmissions may be subject to even greater atmospheric attenuation and shorter range than SHF or UHF transmissions. Techniques disclosed herein may be employed across transmissions that use one or more different frequency regions, and designated use of bands across these frequency regions may differ by country or regulating body.
  • Wireless communications system 100 may include operations by different network operating entities (e.g., network operators) , in which each network operator may share spectrum.
  • a network operating entity may be configured to use an entirety of a designated shared spectrum for at least a period of time before another network operating entity uses the entirety of the designated shared spectrum for a different period of time.
  • certain resources e.g., time
  • a network operating entity may be allocated certain time resources reserved for exclusive communication by the network operating entity using the entirety of the shared spectrum.
  • the network operating entity may also be allocated other time resources where the entity is given priority over other network operating entities to communicate using the shared spectrum.
  • These time resources, prioritized for use by the network operating entity may be utilized by other network operating entities on an opportunistic basis if the prioritized network operating entity does not utilize the resources. Additional time resources may be allocated for any network operator to use on an opportunistic basis.
  • Access to the shared spectrum and the arbitration of time resources among different network operating entities may be centrally controlled by a separate entity, autonomously determined by a predefined arbitration scheme, or dynamically determined based on interactions between wireless nodes of the network operators.
  • wireless communications system 100 may use both licensed and unlicensed radio frequency spectrum bands.
  • wireless communications system 100 may employ license assisted access (LAA) , LTE-unlicensed (LTE-U) radio access technology, or NR technology in an unlicensed band (NR-U) , such as the 5 GHz ISM band.
  • LAA license assisted access
  • LTE-U LTE-unlicensed
  • NR-U unlicensed band
  • UE 115 and base station 105 of the wireless communications system 100 may operate in a shared radio frequency spectrum band, which may include licensed or unlicensed (e.g., contention-based) frequency spectrum.
  • UEs 115 or base stations 105 may traditionally perform a medium-sensing procedure to contend for access to the frequency spectrum.
  • UE 115 or base station 105 may perform a listen before talk (LBT) procedure such as a clear channel assessment (CCA) prior to communicating in order to determine whether the shared channel is available.
  • LBT listen before talk
  • CCA clear channel assessment
  • a CCA may include an energy detection procedure to determine whether there are any other active transmissions on the shared channel. For example, a device may infer that a change in a received signal strength indicator (RSSI) of a power meter indicates that a channel is occupied. Specifically, signal power that is concentrated in a certain bandwidth and exceeds a predetermined noise floor may indicate another wireless transmitter.
  • RSSI received signal strength indicator
  • a CCA also may include message detection of specific sequences that indicate use of the channel. For example, another device may transmit a specific preamble prior to transmitting a data sequence.
  • an LBT procedure may include a wireless node adjusting its own backoff window based on the amount of energy detected on a channel and/or the acknowledge/negative-acknowledge (ACK/NACK) feedback for its own transmitted packets as a proxy for collisions.
  • ACK/NACK acknowledge/negative-acknowledge
  • a first category no LBT or CCA is applied to detect occupancy of the shared channel.
  • a second category (CAT 2 LBT) , which may also be referred to as an abbreviated LBT, a single-shot LBT, or a 25- ⁇ s LBT, provides for the node to perform a CCA to detect energy above a predetermined threshold or detect a message or preamble occupying the shared channel.
  • the CAT 2 LBT performs the CCA without using a random back-off operation, which results in its abbreviated length, relative to the next categories.
  • a third category performs CCA to detect energy or messages on a shared channel, but also uses a random back-off and fixed contention window. Therefore, when the node initiates the CAT 3 LBT, it performs a first CCA to detect occupancy of the shared channel. If the shared channel is idle for the duration of the first CCA, the node may proceed to transmit. However, if the first CCA detects a signal occupying the shared channel, the node selects a random back-off based on the fixed contention window size and performs an extended CCA. If the shared channel is detected to be idle during the extended CCA and the random number has been decremented to 0, then the node may begin transmission on the shared channel.
  • CAT 3 LBT performs CCA to detect energy or messages on a shared channel, but also uses a random back-off and fixed contention window. Therefore, when the node initiates the CAT 3 LBT, it performs a first CCA to detect occupancy of the shared channel. If the shared channel is idle for the duration of the first CCA, the no
  • the node decrements the random number and performs another extended CCA.
  • the node would continue performing extended CCA until the random number reaches 0. If the random number reaches 0 without any of the extended CCAs detecting channel occupancy, the node may then transmit on the shared channel. If at any of the extended CCA, the node detects channel occupancy, the node may re-select a new random back-off based on the fixed contention window size to begin the countdown again.
  • a fourth category (CAT 4 LBT) , which may also be referred to as a full LBT procedure, performs the CCA with energy or message detection using a random back-off and variable contention window size.
  • the sequence of CCA detection proceeds similarly to the process of the CAT 3 LBT, except that the contention window size is variable for the CAT 4 LBT procedure.
  • base stations 105 and UEs 115 may be operated by the same or different network operating entities. In some examples, an individual base station 105 or UE 115 may be operated by more than one network operating entity. In other examples, each base station 105 and UE 115 may be operated by a single network operating entity. Requiring each base station 105 and UE 115 of different network operating entities to contend for shared resources may result in increased signaling overhead and communication latency.
  • operations in unlicensed bands may be based on a carrier aggregation configuration in conjunction with component carriers operating in a licensed band (e.g., LAA) .
  • Operations in unlicensed spectrum may include downlink transmissions, uplink transmissions, peer-to-peer transmissions, or a combination of these.
  • Duplexing in unlicensed spectrum may be based on frequency division duplexing (FDD) , time division duplexing (TDD) , or a combination of both.
  • FDD frequency division duplexing
  • TDD time division duplexing
  • base station 105 or UE 115 may be equipped with multiple antennas, which may be used to employ techniques such as transmit diversity, receive diversity, multiple-input multiple-output (MIMO) communications, or beamforming.
  • wireless communications system 100 may use a transmission scheme between a transmitting device (e.g., a base station 105) and a receiving device (e.g., a UE 115) , where the transmitting device is equipped with multiple antennas and the receiving device is equipped with one or more antennas.
  • MIMO communications may employ multipath signal propagation to increase the spectral efficiency by transmitting or receiving multiple signals via different spatial layers, which may be referred to as spatial multiplexing.
  • the multiple signals may, for example, be transmitted by the transmitting device via different antennas or different combinations of antennas. Likewise, the multiple signals may be received by the receiving device via different antennas or different combinations of antennas.
  • Each of the multiple signals may be referred to as a separate spatial stream, and may carry bits associated with the same data stream (e.g., the same codeword) or different data streams.
  • Different spatial layers may be associated with different antenna ports used for channel measurement and reporting.
  • MIMO techniques include single-user MIMO (SU-MIMO) where multiple spatial layers are transmitted to the same receiving device, and multiple-user MIMO (MU-MIMO) where multiple spatial layers are transmitted to multiple devices.
  • SU-MIMO single-user MIMO
  • MU-MIMO multiple-user MIMO
  • Beamforming which may also be referred to as spatial filtering, directional transmission, or directional reception, is a signal processing technique that may be used at a transmitting device or a receiving device (e.g., a base station 105 or a UE 115) to shape or steer an antenna beam (e.g., a transmit beam or receive beam) along a spatial path between the transmitting device and the receiving device.
  • Beamforming may be achieved by combining the signals communicated via antenna elements of an antenna array such that signals propagating at particular orientations with respect to an antenna array experience constructive interference while others experience destructive interference.
  • the adjustment of signals communicated via the antenna elements may include a transmitting device or a receiving device applying certain amplitude and phase offsets to signals carried via each of the antenna elements associated with the device.
  • the adjustments associated with each of the antenna elements may be defined by a beamforming weight set associated with a particular orientation (e.g., with respect to the antenna array of the transmitting device or receiving device, or with respect to some other orientation) .
  • a base station 105 may use multiple antennas or antenna arrays to conduct beamforming operations for directional communications with a UE 115. For instance, some signals (e.g. synchronization signals, reference signals, beam selection signals, or other control signals) may be transmitted by a base station 105 multiple times in different directions, which may include a signal being transmitted according to different beamforming weight sets associated with different directions of transmission. Transmissions in different beam directions may be used to identify (e.g., by the base station 105 or a receiving device, such as a UE 115) a beam direction for subsequent transmission and/or reception by the base station 105.
  • some signals e.g. synchronization signals, reference signals, beam selection signals, or other control signals
  • Transmissions in different beam directions may be used to identify (e.g., by the base station 105 or a receiving device, such as a UE 115) a beam direction for subsequent transmission and/or reception by the base station 105.
  • Some signals may be transmitted by a base station 105 in a single beam direction (e.g., a direction associated with the receiving device, such as a UE 115) .
  • the beam direction associated with transmissions along a single beam direction may be determined based at least in in part on a signal that was transmitted in different beam directions.
  • a UE 115 may receive one or more of the signals transmitted by the base station 105 in different directions, and the UE 115 may report to the base station 105 an indication of the signal it received with a highest signal quality, or an otherwise acceptable signal quality.
  • a UE 115 may employ similar techniques for transmitting signals multiple times in different directions (e.g., for identifying a beam direction for subsequent transmission or reception by the UE 115) , or transmitting a signal in a single direction (e.g., for transmitting data to a receiving device) .
  • a receiving device may try multiple receive beams when receiving various signals from the base station 105, such as synchronization signals, reference signals, beam selection signals, or other control signals.
  • a receiving device may try multiple receive directions by receiving via different antenna subarrays, by processing received signals according to different antenna subarrays, by receiving according to different receive beamforming weight sets applied to signals received at a plurality of antenna elements of an antenna array, or by processing received signals according to different receive beamforming weight sets applied to signals received at a plurality of antenna elements of an antenna array, any of which may be referred to as “listening” according to different receive beams or receive directions.
  • a receiving device may use a single receive beam to receive along a single beam direction (e.g., when receiving a data signal) .
  • the single receive beam may be aligned in a beam direction determined based at least in part on listening according to different receive beam directions (e.g., a beam direction determined to have a highest signal strength, highest signal-to-noise ratio, or otherwise acceptable signal quality based at least in part on listening according to multiple beam directions) .
  • the antennas of a base station 105 or UE 115 may be located within one or more antenna arrays, which may support MIMO operations, or transmit or receive beamforming.
  • one or more base station antennas or antenna arrays may be co-located at an antenna assembly, such as an antenna tower.
  • antennas or antenna arrays associated with a base station 105 may be located in diverse geographic locations.
  • a base station 105 may have an antenna array with a number of rows and columns of antenna ports that the base station 105 may use to support beamforming of communications with a UE 115.
  • a UE 115 may have one or more antenna arrays that may support various MIMO or beamforming operations.
  • UEs 115 and base stations 105 may support retransmissions of data to increase the likelihood that data is received successfully.
  • HARQ feedback is one technique of increasing the likelihood that data is received correctly over a communication link 125.
  • HARQ may include a combination of error detection (e.g., using a cyclic redundancy check (CRC) ) , forward error correction (FEC) , and retransmission (e.g., automatic repeat request (ARQ) ) .
  • FEC forward error correction
  • ARQ automatic repeat request
  • HARQ may improve throughput at the MAC layer in poor radio conditions (e.g., signal-to-noise conditions) .
  • a wireless device may support same-slot HARQ feedback, where the device may provide HARQ feedback in a specific slot for data received in a previous symbol in the slot, while in other cases, the device may provide HARQ feedback in a subsequent slot, or according to some other time interval.
  • the radio frames may be identified by a system frame number (SFN) ranging from 0 to 1023.
  • SFN system frame number
  • Each frame may include 10 subframes numbered from 0 to 9, and each subframe may have a duration of 1 ms.
  • a subframe may be further divided into 2 slots each having a duration of 0.5 ms, and each slot may contain 6 or 7 modulation symbol periods (e.g., depending on the length of the cyclic prefix prepended to each symbol period) . Excluding the cyclic prefix, each symbol period may contain 2048 sampling periods.
  • a subframe may be the smallest scheduling unit of the wireless communications system 100, and may be referred to as a transmission time interval (TTI) .
  • TTI transmission time interval
  • a smallest scheduling unit of the wireless communications system 100 may be shorter than a subframe or may be dynamically selected (e.g., in bursts of shortened TTIs (sTTIs) or in selected component carriers using sTTIs) .
  • a slot may further be divided into multiple mini-slots containing one or more symbols.
  • a symbol of a mini-slot or a mini-slot may be the smallest unit of scheduling.
  • Each symbol may vary in duration depending on the subcarrier spacing or frequency band of operation, for example.
  • some wireless communications systems may implement slot aggregation in which multiple slots or mini-slots are aggregated together and used for communication between a UE 115 and a base station 105.
  • carrier refers to a set of radio frequency spectrum resources having a defined physical layer structure for supporting communications over a communication link 125.
  • a carrier of a communication link 125 may include a portion of a radio frequency spectrum band that is operated according to physical layer channels for a given radio access technology.
  • Each physical layer channel may carry user data, control information, or other signaling.
  • a carrier may be associated with a pre-defined frequency channel (e.g., an evolved universal mobile telecommunication system terrestrial radio access (E-UTRA) absolute radio frequency channel number (EARFCN) ) , and may be positioned according to a channel raster for discovery by UEs 115.
  • E-UTRA evolved universal mobile telecommunication system terrestrial radio access
  • E-UTRA absolute radio frequency channel number
  • Carriers may be downlink or uplink (e.g., in an FDD mode) , or be configured to carry downlink and uplink communications (e.g., in a TDD mode) .
  • signal waveforms transmitted over a carrier may be made up of multiple sub-carriers (e.g., using multi-carrier modulation (MCM) techniques such as orthogonal frequency division multiplexing (OFDM) or discrete Fourier transform spread OFDM (DFT-S-OFDM) ) .
  • MCM multi-carrier modulation
  • OFDM orthogonal frequency division multiplexing
  • DFT-S-OFDM discrete Fourier transform spread OFDM
  • the organizational structure of the carriers may be different for different radio access technologies (e.g., LTE, LTE-A, LTE-A Pro, NR) .
  • communications over a carrier may be organized according to TTIs or slots, each of which may include user data as well as control information or signaling to support decoding the user data.
  • a carrier may also include dedicated acquisition signaling (e.g., synchronization signals or system information, etc. ) and control signaling that coordinates operation for the carrier.
  • acquisition signaling e.g., synchronization signals or system information, etc.
  • control signaling that coordinates operation for the carrier.
  • a carrier may also have acquisition signaling or control signaling that coordinates operations for other carriers.
  • Physical channels may be multiplexed on a carrier according to various techniques.
  • a physical control channel and a physical data channel may be multiplexed on a downlink carrier, for example, using time division multiplexing (TDM) techniques, frequency division multiplexing (FDM) techniques, or hybrid TDM-FDM techniques.
  • control information transmitted in a physical control channel may be distributed between different control regions in a cascaded manner (e.g., between a common control region or common search space and one or more UE-specific control regions or UE-specific search spaces) .
  • a carrier may be associated with a particular bandwidth of the radio frequency spectrum, and in some examples the carrier bandwidth may be referred to as a “system bandwidth” of the carrier or the wireless communications system 100.
  • the carrier bandwidth may be one of a number of predetermined bandwidths for carriers of a particular radio access technology (e.g., 1.4, 3, 5, 10, 15, 20, 40, or 80 MHz) .
  • each served UE 115 may be configured for operating over portions or all of the carrier bandwidth.
  • some UEs 115 may be configured for operation using a narrowband protocol type that is associated with a predefined portion or range (e.g., set of subcarriers or RBs) within a carrier (e.g., “in-band” deployment of a narrowband protocol type) .
  • a narrowband protocol type that is associated with a predefined portion or range (e.g., set of subcarriers or RBs) within a carrier (e.g., “in-band” deployment of a narrowband protocol type) .
  • a resource element may consist of one symbol period (e.g., a duration of one modulation symbol) and one subcarrier, where the symbol period and subcarrier spacing are inversely related.
  • the number of bits carried by each resource element may depend on the modulation scheme (e.g., the order of the modulation scheme) .
  • the more resource elements that a UE 115 receives and the higher the order of the modulation scheme the higher the data rate may be for the UE 115.
  • a wireless communications resource may refer to a combination of a radio frequency spectrum resource, a time resource, and a spatial resource (e.g., spatial layers) , and the use of multiple spatial layers may further increase the data rate for communications with a UE 115.
  • a spatial resource e.g., spatial layers
  • Devices of the wireless communications system 100 may have a hardware configuration that supports communications over a particular carrier bandwidth, or may be configurable to support communications over one of a set of carrier bandwidths.
  • the wireless communications system 100 may include base stations 105 and/or UEs 115 that support simultaneous communications via carriers associated with more than one different carrier bandwidth.
  • Wireless communications system 100 may support communication with a UE 115 on multiple cells or carriers, a feature which may be referred to as carrier aggregation or multi-carrier operation.
  • a UE 115 may be configured with multiple downlink component carriers and one or more uplink component carriers according to a carrier aggregation configuration.
  • Carrier aggregation may be used with both FDD and TDD component carriers.
  • wireless communications system 100 may utilize enhanced component carriers (eCCs) .
  • eCC may be characterized by one or more features including wider carrier or frequency channel bandwidth, shorter symbol duration, shorter TTI duration, or modified control channel configuration.
  • an eCC may be associated with a carrier aggregation configuration or a dual connectivity configuration (e.g., when multiple serving cells have a suboptimal or non-ideal backhaul link) .
  • An eCC may also be configured for use in unlicensed spectrum or shared spectrum (e.g., where more than one operator is allowed to use the spectrum, such as NR-shared spectrum (NR-SS) ) .
  • NR-SS NR-shared spectrum
  • An eCC characterized by wide carrier bandwidth may include one or more segments that may be utilized by UEs 115 that are not capable of monitoring the whole carrier bandwidth or are otherwise configured to use a limited carrier bandwidth (e.g., to conserve power) .
  • an eCC may utilize a different symbol duration than other component carriers, which may include use of a reduced symbol duration as compared with symbol durations of the other component carriers.
  • a shorter symbol duration may be associated with increased spacing between adjacent subcarriers.
  • a device such as a UE 115 or base station 105, utilizing eCCs may transmit wideband signals (e.g., according to frequency channel or carrier bandwidths of 20, 40, 60, 80 MHz, etc. ) at reduced symbol durations (e.g., 16.67 microseconds) .
  • a TTI in eCC may consist of one or multiple symbol periods. In some cases, the TTI duration (that is, the number of symbol periods in a TTI) may be variable.
  • Wireless communications system 100 may be an NR system that may utilize any combination of licensed, shared, and unlicensed spectrum bands, among others.
  • the flexibility of eCC symbol duration and subcarrier spacing may allow for the use of eCC across multiple spectrums.
  • NR shared spectrum may increase spectrum utilization and spectral efficiency, specifically through dynamic vertical (e.g., across the frequency domain) and horizontal (e.g., across the time domain) sharing of resources.
  • FIG. 2 shows a block diagram of a design of a base station 105 and a UE 115, which may be one of the base station and one of the UEs in FIG. 1.
  • a transmit processor 220 may receive data from a data source 212 and control information from a controller/processor 240.
  • the control information may be for the PBCH, PCFICH, PHICH, PDCCH, EPDCCH, MPDCCH etc.
  • the data may be for the PDSCH, etc.
  • the transmit processor 220 may process (e.g., encode and symbol map) the data and control information to obtain data symbols and control symbols, respectively.
  • the transmit processor 220 may also generate reference symbols, e.g., for the PSS, SSS, and cell-specific reference signal.
  • a transmit (TX) multiple-input multiple-output (MIMO) processor 230 may perform spatial processing (e.g., precoding) on the data symbols, the control symbols, and/or the reference symbols, if applicable, and may provide output symbol streams to the modulators (MODs) 232a through 232t.
  • Each modulator 232 may process a respective output symbol stream (e.g., for OFDM, etc. ) to obtain an output sample stream.
  • Each modulator 232 may further process (e.g., convert to analog, amplify, filter, and upconvert) the output sample stream to obtain a downlink signal.
  • Downlink signals from modulators 232a through 232t may be transmitted via the antennas 234a through 234t, respectively.
  • the antennas 252a through 252r may receive the downlink signals from the base station 105 and may provide received signals to the demodulators (DEMODs) 254a through 254r, respectively.
  • Each demodulator 254 may condition (e.g., filter, amplify, downconvert, and digitize) a respective received signal to obtain input samples.
  • Each demodulator 254 may further process the input samples (e.g., for OFDM, etc. ) to obtain received symbols.
  • a MIMO detector 256 may obtain received symbols from all the demodulators 254a through 254r, perform MIMO detection on the received symbols if applicable, and provide detected symbols.
  • a receive processor 258 may process (e.g., demodulate, deinterleave, and decode) the detected symbols, provide decoded data for the UE 115 to a data sink 260, and provide decoded control information to a controller/processor 280.
  • a transmit processor 264 may receive and process data (e.g., for the PUSCH) from a data source 262 and control information (e.g., for the PUCCH) from the controller/processor 280.
  • the transmit processor 264 may also generate reference symbols for a reference signal.
  • the symbols from the transmit processor 264 may be precoded by a TX MIMO processor 266 if applicable, further processed by the modulators 254a through 254r (e.g., for SC-FDM, etc. ) , and transmitted to the base station 105.
  • the uplink signals from the UE 115 may be received by the antennas 234, processed by the demodulators 232, detected by a MIMO detector 236 if applicable, and further processed by a receive processor 238 to obtain decoded data and control information sent by the UE 115.
  • the processor 238 may provide the decoded data to a data sink 239 and the decoded control information to the controller/processor 240.
  • the controllers/processors 240 and 280 may direct the operation at the base station 105 and the UE 115, respectively.
  • the controller/processor 240 and/or other processors and modules at the base station 105 may perform or direct the execution of various processes for the techniques described herein.
  • the controllers/processor 280 and/or other processors and modules at the UE 115 may also perform or direct the execution of the functional blocks illustrated in FIG. 3, and/or other processes for the techniques described herein.
  • the memories 242 and 282 may store data and program codes for the base station 105 and the UE 115, respectively.
  • a scheduler 244 may schedule UEs for data transmission on the downlink and/or uplink.
  • two signals transmitted from the same antenna port may experience the same radio channel, while these same signals transmitted from two different antenna ports may experience different radio conditions.
  • the antenna ports can be characterized as quasi-co-located (QCL) .
  • QCL quasi-co-located
  • This QCL concept has been introduced to potentially help UEs with various operations, such as channel estimation, frequency offset error estimation, synchronization procedures, and the like. For example, if the UE knows that the radio channels corresponding to two different antenna ports are QCL in terms of Doppler shift, then the UE could determine the Doppler shift associated with one antenna port and apply the result on both antenna ports for channel estimation. Using the QCL concept, the UE avoids calculating the Doppler shift for both antenna ports separately.
  • the different properties that may be common across antenna ports includes Doppler spread/shift, average delay, delay spread, average gain, and spatial receiver parameters. These properties are referred to as the large-scale properties of the antennas port.
  • the specific combinations of large-scale properties that may be shared across various antenna ports have been grouped into four QCL types.
  • QCL-Type A includes the common properties of Doppler shift, Doppler spread, average delay, and delay spread and has been applied for obtaining channel state information (CSI) .
  • QCL-Type B includes Doppler shift and Doppler spread and has also been applied for obtaining CSI.
  • QCL-Type C includes average delay and delay spread and has been applied to obtain various measurement information, such as reference signal receive power (RSRP) .
  • RSRP reference signal receive power
  • QCL-Type D includes the spatial receiver parameter and has been applied to support beamforming.
  • the QCL concept may be used to support reception of various downlink signals at a UE.
  • QCL may be used by a UE to support reception of CSI-reference signal (CSI-RS) and/or CSI-interference measurement (CSI-IM) resources for CSI reporting.
  • CSI-RS CSI-reference signal
  • CSI-IM CSI-interference measurement
  • a base station may signal configuration information to the UE to configure transmission configuration indication (TCI) states that are associated with the particular QCL assumption.
  • TCI transmission configuration indication
  • the means with which the base station communicates such configuration information may depend on whether the CSI reporting is periodic, semi-persistent, or aperiodic.
  • Measurement information may be transmitted from a UE to a serving base station to indicate CSI to the serving base station.
  • a UE may measure and report both on the channel quality, via channel measurements, and interference, via interference measurements.
  • the UE receives configuration information for the channel state reporting.
  • CSI report configuration information may be received by UEs via report setting signaling.
  • a CSI report setting may indicate one resource setting for channel measurement and, optionally, one or two resource settings for interference measurement. Under current standards the resource setting for channel measurements will always be included in channel report signaling, while the resource setting for interference measurement is optional.
  • Interference information resulting from the interference measurement may be reported to a base station implicitly via channel quality indicator (CQI) signaling.
  • CQI channel quality indicator
  • Current standards provide for a specific latency requirement for each CSI reporting type with different criteria. For example, with sub-band wise CSI feedback, high latency requirements would be applied. However, in some of the newer bursty traffic use cases, such as cross-reality (XR) , low latency channel information reporting, especially for interference feedback, may be used by the base station to handle downlink transmissions in an more aggressive manner.
  • IMR interference measurement reporting
  • the UE In an IMR-only CSI feedback mechanism, the UE would determine a suitable receiver-side beam direction for reception of the source reference signal. This kind of information can be informed by the base station via QCL assumption information.
  • QCL-Type D includes a spatial receiver parameter that may be applied to support beamforming.
  • the QCL-Type D information could be used by the UE to determine the receiver-side beam direction.
  • CMR channel measurement reporting
  • IMR specifically-configured CSI-interference measurement
  • IMR-only mechanism is IMR-only –there is no channel measurement configuration.
  • the various aspect of the present disclosure are directed to explicit configuration of IMR-only resources with QCL assumption information, as well as any aperiodic triggering slot offset configuration, where applicable, because there is no paired NZP CSI-RS resource configuration to provide the QCL assumption.
  • FIG. 3 is a block diagram illustrating example blocks executed to implement one aspect of the present disclosure. The example blocks will also be described with respect to UE 115 as illustrated in FIGs. 2 and 6.
  • FIG. 6 is a block diagram illustrating UE 115 configured according to one aspect of the present disclosure.
  • UE 115 includes the structure, hardware, and components as illustrated for UE 115 of FIG. 2.
  • controller/processor 280 which operates to execute logic or computer instructions stored in memory 282, as well as controlling the components of UE 115 that provide the features and functionality of UE 115.
  • UE 115 under control of controller/processor 280, transmits and receives signals via wireless radios 600a-r and antennas 252a-r.
  • Wireless radios 600a-r includes various components and hardware, as illustrated in FIG. 2 for UE 115, including modulator/demodulators 254a-r, MIMO detector 256, receive processor 258, transmit processor 264, and TX MIMO processor 266.
  • a UE receives a CSI report setting configuration.
  • a UE such as UE 115, receives the CSI report setting configuration from a base station via antennas 252a-r and wireless radios 600a-r.
  • the CSI report setting configuration may be signaled from the base station via RRC signaling.
  • the CSI report setting includes the setting configuration for the CSI reporting for UE 115.
  • the CSI report setting configuration configures the type of CSI report for UE 115.
  • the type of CSI report may include configuration of the resource and type of measurement to be performed, such as a non-zero power CSI-reference signal (NZP CSI-RS) configuration for channel measurement, a NZP CSI-RS configuration for interference measurement, or a CSI-IM configuration for interference measurement.
  • the type configuration may also configured whether the CSI report is to be periodic, semi-persistent, or aperiodic. This resource and report type configuration information may then be stored in memory 282 at CSI report setting 601.
  • a UE obtains CSI-IM resource configuration including QCL assumption information associated with a reference signal for one of channel feedback or interference feedback.
  • UE 115 further receives the CSI-IM resource configuration via antennas 252a-r and wireless radios 600a-r.
  • the CSI-IM resource configuration may also be included within RRC signaling.
  • the CSI-IM resource configuration includes a QCL assumption explicitly associated with the identified CSI-IM resource.
  • the UE receives the reference signal using the QCL assumption information.
  • UE 115 In order to perform the CSI reporting process, UE 115 will receive the reference signal within the configured CSI-IM resource.
  • UE 115 uses the QCL assumption information for the reference signal.
  • the QCL assumption information may be identified by UE 115 using the TCI state identifier (ID) identified.
  • ID TCI state identifier
  • the CSI-IM resource configuration may include a TCI state associated with the identified CSI-IM resource.
  • UE 115 under control of controller/processor 280, would use the TCI state information in the CSI-IM resource configuration to identify the corresponding QCL assumption information in QCL table 603, in memory 282.
  • QCL table 603 includes a listing of QCL assumptions indexed by TCI state.
  • UE 115 uses the QCL assumption from QCL table 603 to receive the reference signal.
  • the UE measures interference observed with the reference signal.
  • UE 115 under control of controller/processor 280, executes measurement logic 604, in memory 282.
  • the measurement performed within the execution environment of measurement logic 604 includes interference measurements, as indicated in CSI report settings 601.
  • the UE transmits a CSI report indicating the interference observed based on the CSI-IM resource configuration.
  • UE 115 under control of controller/processor 280, executes CSI report generator 605, in memory 282.
  • the execution environment of CSI report generator 605 provides UE 115 with the functionality to prepare a CSI report that includes the interference measured on observance of the received reference signal.
  • the CSI report is further prepared according to the configurations within CSI report settings 601, configured from the CSI report setting configuration message received from the base station.
  • UE 115 may then transmit the generated CSI report to the base station via wireless radios 600a-r and antennas 252a-r.
  • FIGs. 4A-4C are block diagrams illustrating a UE 115 configured according to aspects of the present disclosure for conducting IMR-only feedback to base station 105.
  • the various aspects of the present disclosure are applicable to each type of CSI reporting, such as periodic, aperiodic, and semi-persistent.
  • the different implementations may include additional procedures related to the CSI-IM resource and report setting for the particular reporting type.
  • FIG. 4A illustrates configuration of UE 115 for periodic CSI-IM feedback reporting.
  • Base station 105 configures UE 115 for CSI reporting via RRC signaling 40.
  • RRC signaling 40 may include CSI report setting configuration 400, which configures the type of CSI report for UE 115.
  • the type of CSI report may include configuration of the resource and type of measurement to be performed, such as a non-zero power CSI-reference signal (NZP CSI-RS) configuration for channel measurement, a NZP CSI-RS configuration for interference measurement, or a CSI-IM configuration for interference measurement.
  • the type configuration may also configured whether the CSI report is to be periodic, semi-persistent, or aperiodic.
  • a reference to at least one TCI state may be provided in CSI-IM resource configuration 401, within RRC signaling 40.
  • the indicated TCI state associated with the configured CSI-IM resource corresponds to the QCL source and type information for UE 115.
  • the reference signal within the CSI-IM resource can be implemented using various reference signals, such as a synchronization signal block (SSB) , a periodic CSI-RS, or the like.
  • CSI-IM resource configuration 400 may be transmitted from base station 105 via RRC signaling 40 either along with or separately from CSI report setting configuration 400.
  • the referenced TCI state may be included as a TCI state identifier (ID) in an RRC information element (IE) of CSI-IM resource configuration 401.
  • RRC signaling 40 configuring the CSI-IM resource may be specific to the downlink bandwidth part (BWP) configured for downlink transmissions (e.g., PDSCH) .
  • BWP downlink bandwidth part
  • FIG. 4B illustrates configuration of UE 115 for periodic CSI-IM feedback reporting.
  • a reference to at the TCI states may be configured to provide the QCL source and type for either an identified CSI-IM resource or a CSI-IM resource set.
  • the CSI-IM resource set may be configured for interference measurement in a list of aperiodic trigger states for UE 115.
  • a set of possible trigger states e.g., up to 128 trigger states
  • RRC signaling such as RRC signaling 410.
  • Each trigger state may be associated with up to 16 report settings, which are linked through a CSI report configuration ID configuring a CSI-IM resource set.
  • Each CSI-IM resource set includes multiple CSI-IM resources. At least one TCI state may be indicated for each such CSI-IM resource in the resource set, which may be indicated as part of the trigger state configuration. As indicated for the periodic CSI reporting of FIG. 4A, RRC signaling 40 configuring the CSI-IM resource may be specific to the downlink BWP configured for downlink transmissions.
  • base station 105 transmits a medium access control –control element (MAC-CE) 411 that may activate or deactivate a subset of the available triggers states.
  • the number of trigger states activated, n may correspond to the number of bits, n, in the CSI request field of a downlink control information (DCI) message, such as DCI 412.
  • DCI downlink control information
  • the subset of available trigger states identify a CSI-IM resource set according to indicate report settings.
  • Base station 105 transmits DCI 412, which identifies one trigger state in the CSI request field.
  • UE 115 thus, reads the trigger state from DCI 412 to identify the specific CSI-IM resource and associated TCI state ID of the resource set indicated via MAC-CE 411.
  • the TCI state ID allows UE 115 to identify the QCL assumption information associated with the identified CSI-IM resource. Once the QCL assumption information is identified, UE 115 may receive reference signal 413 using the QCL assumption information.
  • Reference signal 413 can be implemented using various reference signals, such as SSB, CSI-RS, whether periodic, aperiodic, or semi-persistent, or the like.
  • configurations for NZP CSI-RS for channel measurement and CSI-IM/NZP CSI-RS for interference measurement are optional.
  • configuration of NZP CSI-RS for channel measurement would be mandatory in the configuration messages of RRC signaling 410.
  • FIG. 4C illustrates configuration of UE 115 for semi-persistent CSI-IM feedback reporting.
  • a new MAC CE MAC CE 420
  • MAC CE 420 is proposed for semi-persistent CSI-RS/CSI-IM resource set activation/deactivation, which can activate/deactivate semi-persistent CSI-RS and semi-persistent CSI-IM jointly or separately.
  • Base station 105 starts the process similarly to the aperiodic reporting procedure of FIG. 4B.
  • Base station 105 transmits RRC signalling, similar to RRC signalling 410, which defines the set of available CSI-IM resources through a set of available trigger states.
  • MAC CE 420 activates or deactivates a subset of trigger states, which may represent the semi-persistent CSI-RS/CSI-IM resource sets, as indicated above.
  • the identified TCI state IDs included within MAC CE 420 will be associated with either the semi-persistent CSI RS resource sets/trigger states or the semi-persistent CSI-IM resource sets/trigger states or both.
  • MAC CE 420 adds channel measurement (CM) field 421, which identifies to UE 115 whether the semi-persistent CSI-RS resource set ID field is valid or not. If CM field 421 is set to 1, the semi-persistent CSI-RS resource set ID field is considered valid, and if CM field is set to 0, the semi-persistent CSI-RS resource set ID field is not valid. When the semi-persistent CSI-RS resource set ID field is not valid, the TCI state IDs will apply to the CSI-IM resource set ID indicated in MAC CE 420.
  • CM channel measurement
  • the TCI state IDs will apply to both the semi-persistent CSI-RS resource set IDs and the semi-persistent CSI-IM resource set IDs. Similarly, where both are indicated as invalid, the TCI state IDs will not apply to either.
  • UE 115 may determine which QCL assumption to apply to receiving the reference signal on the CSI-IM resource either by determining from MAC CE 420 which CSI-IM resource of the resource set is transmitted or by receiving a DCI message, such as DCI 412 of FIG. 4B, which identifies the CSI-IM resource. UE 115 would then identify the QCL assumption information based on the TCI state ID associated with the CSI-IM resource of the activated CSI-IM resource set in MAC CE 420 for receiving the reference signal. As illustrated in FIG. 4B, UE 115 would then measure the interference observed on reference signal 413 and transmit a CSI report identifying the observed interference.
  • FIG. 5 is a block diagram illustrating UE 115 and base station 105 configured according to one aspect of the present disclosure for configuration of aperiodic CSI-IM resources.
  • the CSI-IM resource configuration message may include a triggering offset which identifies to UE 115 an offset of X slots between the slot containing the DCI that triggers the set of aperiodic CSI-IM resources and the slot in which the CSI-IM resource set is located. Because a number of slots may be available between the PDCCH slot 500, which includes the triggering DCI and the next uplink occasion at PUSCH slot 503, the triggering offset may be coded.
  • the trigger offset value provided at the DCI triggering CSI-IM resource set 501 is set to 4, corresponding to 4 slots between PDCCH slot 500 and the slot for CSI-IM resource set 501.
  • the trigger offset value provided at the DCI triggering CSI-IM resource set 502 is set to 5, corresponding to 16 slots between PDCCH slot 500 and the slot for CSI-IM resource set 502.
  • UE 115 will know to wait 4 slots before using the associated QCL assumption information for receiving the corresponding CSI-IM resource of CSI-IM resource set 501.
  • UE 115 will also know to wait 16 slots before using the associated QCL assumption information for receiving the corresponding CSI-IM resource of CSI-IM resource set 502.
  • UE 115 may apply the value 0 and look to receive the CSI-IM resource in the current slot.
  • the functional blocks and modules in FIG. 3 may comprise processors, electronics devices, hardware devices, electronics components, logical circuits, memories, software codes, firmware codes, etc., or any combination thereof.
  • a first aspect of wireless communication may include receiving, by a UE, a CSI report setting configuration; obtaining, by the UE, a CSI-IM resource configuration including QCL assumption information associated with a reference signal for one of channel feedback or interference feedback; receiving, by the UE, the reference signal using the QCL assumption information; measuring, by the UE, interference observed with the reference signal; and transmitting, by the UE, a CSI report indicating the interference observed based on the CSI-IM resource configuration.
  • the CSI report setting configuration includes one or more of: a NZP CSI-RS configuration for channel measurement; the NZP CSI-RS configuration for interference measurement; and a CSI-IM configuration for interference measurement.
  • the reference signal includes one of: a SSB transmission; or a CSI-RS.
  • the obtaining the CSI-IM resource configuration includes: receiving a RRC signaling including the CSI-IM resource configuration identifying the reference signal with the associated QCL assumption information and a CSI report setting mapping one or more measurement types for the CSI-IM resource configuration.
  • a fifth aspect based on the first aspect, wherein the CSI-IM resource configuration corresponds to a downlink BWP.
  • the obtaining the CSI-IM resource configuration includes: receiving, by the UE, a periodic CSI-IM resource configuration, wherein the periodic CSI-IM resource configuration includes identification of the reference signal and a TCI state corresponding to the QCL assumption information associated with the reference signal; receiving, by the UE, a CSI report setting, wherein the CSI report setting maps one or more measurement types associated with the periodic CSI-IM resource configuration, wherein the CSI report is based on the one or more measurement types performed on the reference signal.
  • a seventh aspect based on the sixth aspect, wherein the CSI report is one of: periodic, semi-persistent, or aperiodic.
  • the obtaining the CSI-IM resource configuration includes: receiving, at the UE, an aperiodic CSI-IM resource configuration including a plurality of CSI trigger states defining one or more CSI-IM resource sets including one or more corresponding CSI-IM resources and a transmission configuration indicator (TCI) state corresponding to the QCL assumption information associated with each of the one or more corresponding CSI-IM resources; receiving, by the UE, an aperiodic CSI report setting, wherein the aperiodic CSI report setting maps one or more measurement types associated with the aperiodic CSI-IM resource configuration, wherein the CSI report is based on the one or more measurement types performed on the CSI-IM resource; receiving, at the UE, a MAC-CE that activates a subset of activated CSI trigger states of the plurality of triggers states for aperiodic CSI-IM reporting; and receiving, at the UE, a DCI identifying an aperiodic CSI-IM resource
  • a ninth aspect based on the eighth aspect, wherein the receiving the CSI-IM resource includes: mapping, by the UE, the CSI-IM resource to the TCI state associated with the CSI-RS resource using the aperiodic CSI-IM resource configuration; identifying, by the UE, the QCL assumption information corresponding to the TCI state; and receiving, by the UE, the CSI-IM resource using the QCL assumption information.
  • the aperiodic CSI-IM resource configuration further includes a trigger offset for each of the one or more CSI-IM resource sets, wherein the trigger offset identifies a number of slots between a first slot carrying the DCI and a resource slot carrying the one or more corresponding CSI-IM resources.
  • the obtaining the CSI-IM resource configuration includes: receiving, at the UE, a semi-persistent CSI-IM resource configuration including a plurality of CSI trigger states defining one or more CSI-IM resource sets including one or more corresponding CSI-IM resources and a TCI state associated with each of the one or more corresponding CSI-IM resources; receiving, by the UE, a CSI report setting, wherein the CSI report setting maps one or more measurement types associated with the semi-persistent CSI-IM resource configuration, wherein the CSI report is based on the one or more measurement types performed on the CSI-IM resource; and receiving, at the UE, a MAC-CE that activates a subset of activated CSI trigger states of the plurality of triggers states for semi-persistent CSI-IM reporting identifying a CSI-IM resource set ID of the one or more CSI-IM resource sets and associated one or more TCI state IDs associated with the CSI-IM resource set
  • a twelfth aspect based on the eleventh aspect, wherein the CSI report is one of: semi-persistent or aperiodic.
  • the receiving the CSI-IM resource includes: mapping, by the UE, the a CSI-IM resource corresponding to the CSI-IM resource set ID to a TCI state associated with the CSI-RS resource using the semi-persistent CSI-IM resource configuration; identifying, by the UE, the QCL assumption information corresponding to the TCI state; and receiving, by the UE, the reference signal using the QCL assumption information.
  • a fourteenth aspect including any combination of the first through the thirteenth aspects.
  • DSP digital signal processor
  • ASIC application specific integrated circuit
  • FPGA field programmable gate array
  • a general-purpose processor may be a microprocessor, but in the alternative, the processor may be any conventional processor, controller, microcontroller, or state machine.
  • a processor may also be implemented as a combination of computing devices, e.g., a combination of a DSP and a microprocessor, a plurality of microprocessors, one or more microprocessors in conjunction with a DSP core, or any other such configuration.
  • a software module may reside in RAM memory, flash memory, ROM memory, EPROM memory, EEPROM memory, registers, hard disk, a removable disk, a CD-ROM, or any other form of storage medium known in the art.
  • An exemplary storage medium is coupled to the processor such that the processor can read information from, and write information to, the storage medium.
  • the storage medium may be integral to the processor.
  • the processor and the storage medium may reside in an ASIC.
  • the ASIC may reside in a user terminal.
  • the processor and the storage medium may reside as discrete components in a user terminal.
  • the functions described may be implemented in hardware, software, firmware, or any combination thereof. If implemented in software, the functions may be stored on or transmitted over as one or more instructions or code on a computer-readable medium.
  • Computer-readable media includes both computer storage media and communication media including any medium that facilitates transfer of a computer program from one place to another. Computer-readable storage media may be any available media that can be accessed by a general purpose or special purpose computer.
  • such computer-readable media can comprise RAM, ROM, EEPROM, CD-ROM or other optical disk storage, magnetic disk storage or other magnetic storage devices, or any other medium that can be used to carry or store desired program code means in the form of instructions or data structures and that can be accessed by a general-purpose or special-purpose computer, or a general-purpose or special-purpose processor.
  • a connection may be properly termed a computer-readable medium.
  • the software is transmitted from a website, server, or other remote source using a coaxial cable, fiber optic cable, twisted pair, or digital subscriber line (DSL) , then the coaxial cable, fiber optic cable, twisted pair, or DSL, are included in the definition of medium.
  • DSL digital subscriber line
  • Disk and disc includes compact disc (CD) , laser disc, optical disc, digital versatile disc (DVD) , floppy disk and blu-ray disc where disks usually reproduce data magnetically, while discs reproduce data optically with lasers. Combinations of the above should also be included within the scope of computer-readable media.
  • the term “and/or, ” when used in a list of two or more items means that any one of the listed items can be employed by itself, or any combination of two or more of the listed items can be employed.
  • the composition can contain A alone; B alone; C alone; A and B in combination; A and C in combination; B and C in combination; or A, B, and C in combination.

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Abstract

L'invention concerne l'amélioration de la configuration de ressources de gestion d'interférence d'informations d'état de canal (CSI-IM). La configuration de ressources CSI-IM peut comprendre des informations d'hypothèse de quasi-colocalisation (QCL) spécifiquement pour la ressource CSI-IM. Un équipement utilisateur (UE) compatible reçoit une configuration de réglage de rapport de CSI permettant de préparer un rapport de CSI sur des informations de canal. L'UE devrait obtenir une configuration de ressources CSI-IM comprenant les informations d'hypothèse QCL associées à un signal de référence pour une rétroaction de canal ou d'interférence. L'UE reçoit le signal de référence à l'aide des informations d'hypothèse QCL et mesure l'interférence observée à l'aide du signal de référence. L'UE transmet ensuite un rapport de CSI indiquant l'interférence observée sur la base de la configuration de ressources CSI-IM.
PCT/CN2020/086796 2020-04-24 2020-04-24 Amélioration de la configuration de ressources de gestion d'interférence d'informations d'état de canal Ceased WO2021212502A1 (fr)

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Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20180343653A1 (en) * 2017-05-26 2018-11-29 Samsung Electronics Co., Ltd. Method and apparatus for beam indication in next generation wireless systems
US20190165847A1 (en) * 2017-11-28 2019-05-30 Lg Electronics Inc. Method for reporting channel state information in wireless communication system and apparatus for the same

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20180343653A1 (en) * 2017-05-26 2018-11-29 Samsung Electronics Co., Ltd. Method and apparatus for beam indication in next generation wireless systems
US20190165847A1 (en) * 2017-11-28 2019-05-30 Lg Electronics Inc. Method for reporting channel state information in wireless communication system and apparatus for the same

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