WO2021087971A1 - Indicateur de seuil de détection d'énergie servant au partage de temps d'occupation de canal (cot) - Google Patents

Indicateur de seuil de détection d'énergie servant au partage de temps d'occupation de canal (cot) Download PDF

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Publication number
WO2021087971A1
WO2021087971A1 PCT/CN2019/116684 CN2019116684W WO2021087971A1 WO 2021087971 A1 WO2021087971 A1 WO 2021087971A1 CN 2019116684 W CN2019116684 W CN 2019116684W WO 2021087971 A1 WO2021087971 A1 WO 2021087971A1
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Prior art keywords
cot
detection threshold
energy detection
lbt
indicating
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PCT/CN2019/116684
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English (en)
Inventor
Changlong Xu
Jing Sun
Kapil Bhattad
Xiaoxia Zhang
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Qualcomm Inc
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Qualcomm Inc
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Priority to PCT/CN2019/116684 priority Critical patent/WO2021087971A1/fr
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W74/00—Wireless channel access
    • H04W74/08—Non-scheduled access, e.g. ALOHA
    • H04W74/0808—Non-scheduled access, e.g. ALOHA using carrier sensing, e.g. carrier sense multiple access [CSMA]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W74/00—Wireless channel access
    • H04W74/002—Transmission of channel access control information
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W74/00—Wireless channel access
    • H04W74/002—Transmission of channel access control information
    • H04W74/006—Transmission of channel access control information in the downlink, i.e. towards the terminal

Definitions

  • This application relates to wireless communication systems, and more particularly to signaling an energy detection threshold for channel occupancy time (COT) sharing.
  • COT channel occupancy time
  • Wireless communications systems are widely deployed to provide various types of communication content such as voice, video, packet data, messaging, broadcast, and so on. These systems may be capable of supporting communication with multiple users by sharing the available system resources (e.g., time, frequency, and power) .
  • a wireless multiple-access communications system may include a number of base stations (BSs) , each simultaneously supporting communications for multiple communication devices, which may be otherwise known as user equipment (UE) .
  • BSs base stations
  • UE user equipment
  • NR next generation new radio
  • LTE long term evolution
  • NR next generation new radio
  • LTE long term evolution
  • NR is designed to provide a lower latency, a higher bandwidth or a higher throughput, and a higher reliability than LTE.
  • LTE long term evolution
  • NR is designed to operate over a wide array of spectrum bands, for example, from low-frequency bands below about 1 gigahertz (GHz) and mid-frequency bands from about 1 GHz to about 6 GHz, to high-frequency bands such as millimeter wave (mmWave) bands.
  • GHz gigahertz
  • mmWave millimeter wave
  • NR is also designed to operate across different spectrum types, from licensed spectrum to unlicensed and shared spectrum. Spectrum sharing enables operators to opportunistically aggregate spectrums to dynamically support high-bandwidth services. Spectrum sharing can extend the benefit of NR technologies to operating entities that may not have access to a licensed spectrum.
  • a transmitting node e.g., a BS or a UE
  • CAT2 LBT category 2 LBT
  • CAT4 LBT category 4
  • a BS may acquire a COT in an unlicensed frequency band by performing a CAT4 LBT.
  • the BS may schedule one or more UEs for UL and/or DL communication within the BS’s COT.
  • the BS may schedule one or more UEs for UL communication outside of the BS’s COT.
  • a method of wireless communication includes acquiring, by a user equipment (UE) , a first channel occupancy time (COT) based on a first energy detection threshold, wherein a duration of the first COT is for exclusive use by the UE; acquiring, by the UE, a second COT based on a second energy detection threshold indicated by COT sharing information associated with the second COT, wherein the first energy detection threshold is different from the second energy detection threshold; and receiving, by the UE from a base station (BS) , a downlink (DL) communication signal during a first portion of the second COT based on the COT sharing information.
  • BS base station
  • an apparatus includes a processor configured to acquire, by a user equipment (UE) , a first channel occupancy time (COT) based on a first energy detection threshold, wherein a duration of the first COT is for exclusive use by the UE; and acquire, by the UE, a second COT based on a second energy detection threshold indicated by COT sharing information associated with the second COT, wherein the first energy detection threshold is different from the second energy detection threshold; and a transceiver configured receive, by the UE from a base station (BS) , a downlink (DL) communication signal during a first portion of the second COT based on the COT sharing information.
  • BS base station
  • DL downlink
  • a computer-readable medium having program code recorded thereon includes code for causing a user equipment (UE) to acquire a first channel occupancy time (COT) based on a first energy detection threshold, wherein a duration of the first COT is for exclusive use by the UE; code for causing the UE to acquire a second COT based on a second energy detection threshold indicated by COT sharing information associated with the second COT, wherein the first energy detection threshold is different from the second energy detection threshold; and code for causing the UE to receive from a base station (BS) , a downlink (DL) communication signal during a first portion of the second COT based on the COT sharing information.
  • BS base station
  • DL downlink
  • an apparatus includes means for acquiring a first channel occupancy time (COT) based on a first energy detection threshold, wherein a duration of the first COT is for exclusive use by the UE; means for acquiring a second COT based on a second energy detection threshold indicated by COT sharing information associated with the second COT, wherein the first energy detection threshold is different from the second energy detection threshold; and means for receiving from a base station (BS) , a downlink (DL) communication signal during a first portion of the second COT based on the COT sharing information.
  • COT channel occupancy time
  • BS base station
  • DL downlink
  • a method of wireless communication includes receiving, by a base station (BS) from a user equipment (UE) , an uplink (UL) communication signal during a first UE-acquired channel occupancy time (COT) based on a first energy detection threshold, wherein a duration of the first COT is for exclusive use by the UE; acquiring, by the BS, a duration of a second UE-acquired COT based on a second energy detection threshold indicated by COT sharing information associated with the second UE-acquired COT, wherein the first energy detection threshold is different from the second energy detection threshold; and transmitting, by the BS to the UE, a downlink (DL) communication signal during the duration of the second UE-acquired COT.
  • BS base station
  • UE user equipment
  • COT channel occupancy time
  • an apparatus includes a transceiver configured to: receive, by a base station (BS) from a user equipment (UE) , an uplink (UL) communication signal during a first UE-acquired channel occupancy time (COT) based on a first energy detection threshold, wherein a duration of the first COT is for exclusive use by the UE; and transmit, by the BS to the UE, a downlink (DL) communication signal during a duration of a second UE-acquired COT; and a processor configured to: acquire, by the BS, the duration of the second UE-acquired COT based on a second energy detection threshold indicated by COT sharing information associated with the second UE-acquired COT, wherein the first energy detection threshold is different from the second energy detection threshold.
  • BS base station
  • UE user equipment
  • COT channel occupancy time
  • a computer-readable medium having program code recorded thereon includes code for causing a base station (BS) to receive from a user equipment (UE) , an uplink (UL) communication signal during a first UE-acquired channel occupancy time (COT) based on a first energy detection threshold, wherein a duration of the first COT is for exclusive use by the UE; code for causing the BS to acquire a duration of a second UE-acquired COT based on a second energy detection threshold indicated by COT sharing information associated with the second UE-acquired COT, wherein the first energy detection threshold is different from the second energy detection threshold; and code for causing the BS to transmit to the UE, a downlink (DL) communication signal during the duration of the second UE-acquired COT.
  • BS base station
  • UE user equipment
  • COT channel occupancy time
  • an apparatus includes means for receiving from a user equipment (UE) , an uplink (UL) communication signal during a first UE-acquired channel occupancy time (COT) based on a first energy detection threshold, wherein a duration of the first COT is for exclusive use by the UE; means for acquiring a duration of a second UE-acquired COT based on a second energy detection threshold indicated by COT sharing information associated with the second UE-acquired COT, wherein the first energy detection threshold is different from the second energy detection threshold; and means for transmitting to the UE, a downlink (DL) communication signal during the duration of the second UE-acquired COT.
  • UE user equipment
  • COT channel occupancy time
  • FIG. 1 illustrates a wireless communication network according to some aspects of the present disclosure.
  • FIG. 2 is a timing diagram illustrating a communication scheme for a user equipment (UE) having different energy detection thresholds for performing listen-before-talk (LBT) according to some aspects of the present disclosure.
  • UE user equipment
  • FIG. 3 is a block diagram of a UE according to some aspects of the present disclosure.
  • FIG. 4 is a block diagram of a base station (BS) according to some aspects of the present disclosure.
  • FIG. 5 is a timing diagram illustrating a communication scheme for assigning an energy detection threshold for the UE according to some aspects of the present disclosure.
  • FIG. 6 is a timing diagram illustrating a communication scheme for assigning an energy detection threshold for the UE according to some aspects of the present disclosure.
  • FIG. 7 is a timing diagram illustrating a communication scheme for a UE to indicate an energy detection threshold to the BS according to some aspects of the present disclosure.
  • FIG. 8 illustrates a frame based equipment (FBE) spectrum sharing scheme according to one or more aspects of the present disclosure.
  • FBE frame based equipment
  • FIG. 9 is a flow diagram of a communication method according to some aspects of the present disclosure.
  • FIG. 10 is a flow diagram of a communication method according to some aspects of the present disclosure.
  • 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, Global System for Mobile Communications (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) , Institute of Electrical and Electronics Engineers (IEEE) 802.11, IEEE 802.16, IEEE 802.20, flash-OFDM and the like.
  • E-UTRA evolved UTRA
  • IEEE Institute of Electrical and Electronics Engineers
  • 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
  • LTE long term evolution
  • 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.
  • 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 (SCS) , may efficiently address operating diverse services across diverse spectrum and diverse deployments.
  • SCS may occur with 15 kHz, for example over 5, 10, 20 MHz, and the like bandwidth (BW) .
  • BW bandwidth
  • SCS may occur with 30 kHz over 80/100 MHz BW.
  • the SCS may occur with 60 kHz over a 160 MHz BW.
  • the SCS may occur with 120 kHz over a 500 MHz BW.
  • 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 UL/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 UL/downlink that may be flexibly configured on a per-cell basis to dynamically switch between UL and downlink to meet the current traffic needs.
  • a UE may perform a first LBT using a first energy detection threshold. If the first LBT results in an LBT pass, the UE may acquire a first COT based on the first energy detection threshold. The UE may use the first energy detection threshold for the first LBT if a duration of the first COT is for exclusive use by the UE. In this example, the UE does not share the first COT with the BS. The UE may not have enough UL transmissions to use the entire duration of the first COT. As an example, the first COT may have a duration of about 6 milliseconds (ms) , but an UL communication signal may span a duration of about 2 ms. Thus, the remaining 4 ms may be unused.
  • ms milliseconds
  • the UE may share a COT with the BS for DL communications to reduce wasted resources.
  • the BS may transmit a DL communication signal during a portion of the 4 ms that would have originally been left unused by the UE in a non-COT sharing scenario.
  • the UE may perform a second LBT using a second energy detection threshold. If the second LBT results in an LBT pass, the UE may acquire a second COT based on the second energy detection threshold. The UE may use the second energy detection threshold in acquiring a COT if the second COT is shared between the UE and the BS.
  • the first energy detection threshold may be based on the maximum transmit power of the UE, and the second energy detection threshold may be based on the maximum transmit power of a serving BS. Accordingly, the UE may perform LBTs using different energy detection thresholds and the BS may be unaware of which energy detection threshold the UE uses for performing LBT.
  • the present application provides techniques for determining an energy detection threshold for the UE to use for an LBT.
  • the BS may assign one energy detection threshold per PDCCH UL grant or configured UL grant.
  • the BS may provide an indication of the energy detection threshold to the UE for use in acquiring one or more COTs.
  • the UE may determine the energy detection threshold and provide an indication of the energy detection threshold to the BS. Accordingly, the BS may be aware of the energy detection threshold being used by the UE.
  • FIG. 1 illustrates a wireless communication network 100 according to some aspects of the present disclosure.
  • the network 100 may be a 5G network.
  • the network 100 includes a number of base stations (BSs) 105 (individually labeled as 105a, 105b, 105c, 105d, 105e, and 105f) and other network entities.
  • a BS 105 may be a station that communicates with UEs 115 and may also be referred to as an evolved node B (eNB) , a next generation eNB (gNB) , an access point, and the like.
  • eNB evolved node B
  • gNB next generation eNB
  • Each BS 105 may provide communication coverage for a particular geographic area.
  • the term “cell” can refer to this particular geographic coverage area of a BS 105 and/or a BS subsystem serving the coverage area, depending on the context in which the term is used.
  • a BS 105 may provide communication coverage for a macro cell or a small cell such as a pico cell or a femto cell, and/or other types of cell.
  • a macro cell generally covers a relatively large geographic area (e.g., several kilometers in radius) and may allow unrestricted access by UEs with service subscriptions with the network provider.
  • a small cell, such as a pico cell would generally cover a relatively smaller geographic area and may allow unrestricted access by UEs with service subscriptions with the network provider.
  • a small cell such as a femto cell, would also generally cover a relatively small geographic area (e.g., a home) and, in addition to unrestricted access, may also provide restricted access by UEs having an association with the femto cell (e.g., UEs in a closed subscriber group (CSG) , UEs for users in the home, and the like) .
  • a BS for a macro cell may be referred to as a macro BS.
  • a BS for a small cell may be referred to as a small cell BS, a pico BS, a femto BS or a home BS. In the example shown in FIG.
  • the BSs 105d and 105e may be regular macro BSs, while the BSs 105a-105c may be macro BSs enabled with one of three dimension (3D) , full dimension (FD) , or massive MIMO.
  • the BSs 105a-105c may take advantage of their higher dimension MIMO capabilities to exploit 3D beamforming in both elevation and azimuth beamforming to increase coverage and capacity.
  • the BS 105f may be a small cell BS which may be a home node or portable access point.
  • a BS 105 may support one or multiple (e.g., two, three, four, and the like) cells.
  • the network 100 may support synchronous or asynchronous operation.
  • the BSs may have similar frame timing, and transmissions from different BSs may be approximately aligned in time.
  • the BSs may have different frame timing, and transmissions from different BSs may not be aligned in time.
  • the UEs 115 are dispersed throughout the wireless network 100, and each UE 115 may be stationary or mobile.
  • a UE 115 may also be referred to as a terminal, a mobile station, a subscriber unit, a station, or the like.
  • a UE 115 may be a cellular phone, a personal digital assistant (PDA) , a wireless modem, a wireless communication device, a handheld device, a tablet computer, a laptop computer, a cordless phone, a wireless local loop (WLL) station, or the like.
  • PDA personal digital assistant
  • WLL wireless local loop
  • a UE 115 may be a device that includes a Universal Integrated Circuit Card (UICC) .
  • a UE may be a device that does not include a UICC.
  • UICC Universal Integrated Circuit Card
  • the UEs 115 that do not include UICCs may also be referred to as IoT devices or internet of everything (IoE) devices.
  • the UEs 115a-115d are examples of mobile smart phone-type devices accessing network 100.
  • a UE 115 may also be a machine specifically configured for connected communication, including machine type communication (MTC) , enhanced MTC (eMTC) , narrowband IoT (NB-IoT) and the like.
  • MTC machine type communication
  • eMTC enhanced MTC
  • NB-IoT narrowband IoT
  • the UEs 115e-115h are examples of various machines configured for communication that access the network 100.
  • the UEs 115i-115k are examples of vehicles equipped with wireless communication devices configured for communication that access the network 100.
  • a UE 115 may be able to communicate with any type of the BSs, whether macro BS, small cell, or the like.
  • a lightning bolt e.g., communication links indicates wireless transmissions between a UE 115 and a serving BS 105, which is a BS designated to serve the UE 115 on the downlink (DL) and/or uplink (UL) , desired transmission between BSs 105, backhaul transmissions between BSs, or sidelink transmissions between UEs 115.
  • the BSs 105a-105c may serve the UEs 115a and 115b using 3D beamforming and coordinated spatial techniques, such as coordinated multipoint (CoMP) or multi-connectivity.
  • the macro BS 105d may perform backhaul communications with the BSs 105a-105c, as well as small cell, the BS 105f.
  • the macro BS 105d may also transmits multicast services which are subscribed to and received by the UEs 115c and 115d.
  • Such multicastservices may include mobile television or stream video, or may include other services for providing community information, such as weather emergencies or alerts, such as Amber alerts or gray alerts.
  • the BSs 105 may also communicate with a core network.
  • the core network may provide user authentication, access authorization, tracking, Internet Protocol (IP) connectivity, and other access, routing, or mobility functions.
  • IP Internet Protocol
  • At least some of the BSs 105 (e.g., which may be an example of a gNB or an access node controller (ANC) ) may interface with the core network through backhaul links (e.g., NG-C, NG-U, etc. ) and may perform radio configuration and scheduling for communication with the UEs 115.
  • the BSs 105 may communicate, either directly or indirectly (e.g., through core network) , with each other over backhaul links (e.g., X1, X2, etc. ) , which may be wired or wireless communication links.
  • the network 100 may also support mission critical communications with ultra-reliable and redundant links for mission critical devices, such as the UE 115e, which may be a drone. Redundant communication links with the UE 115e may include links from the macro BSs 105d and 105e, as well as links from the small cell BS 105f.
  • UE 115f e.g., a thermometer
  • UE 115g e.g., smart meter
  • UE 115h e.g., wearable device
  • the network 100 may also provide additional network efficiency through dynamic, low-latency TDD/FDD communications, such as vehicle-to-vehicle (V2V) communications among the UEs 115i-115k, vehicle-to-everything (V2X) communications between a UE 115i, 115j, or 115k and other UEs 115, and/or vehicle-to-infrastructure (V2I) communications between a UE 115i, 115j, or 115k and a BS 105.
  • V2V vehicle-to-vehicle
  • V2X vehicle-to-everything
  • V2I vehicle-to-infrastructure
  • the network 100 utilizes OFDM-based waveforms for communications.
  • An OFDM-based system may partition the system BW into multiple (K) orthogonal subcarriers, which are also commonly referred to as subcarriers, tones, bins, or the like. Each subcarrier may be modulated with data.
  • the SCS between adjacent subcarriers may be fixed, and the total number of subcarriers (K) may be dependent on the system BW.
  • the system BW may also be partitioned into subbands.
  • the SCS and/or the duration of TTIs may be scalable.
  • the BSs 105 can assign or schedule transmission resources (e.g., in the form of time-frequency resource blocks (RB) ) for downlink (DL) and uplink (UL) transmissions in the network 100.
  • DL refers to the transmission direction from a BS 105 to a UE 115
  • UL refers to the transmission direction from a UE 115 to a BS 105.
  • the communication can be in the form of radio frames.
  • a radio frame may be divided into a plurality of subframes or slots, for example, about 10. Each slot may be further divided into mini-slots. In a FDD mode, simultaneous UL and DL transmissions may occur in different frequency bands.
  • each subframe includes an UL subframe in an UL frequency band and a DL subframe in a DL frequency band.
  • a subframe may also be referred to as a slot.
  • UL and DL transmissions occur at different time periods using the same frequency band.
  • a subset of the subframes (e.g., DL subframes) in a radio frame may be used for DL transmissions and another subset of the subframes (e.g., UL subframes) in the radio frame may be used for UL transmissions.
  • each DL or UL subframe may have pre-defined regions for transmissions of reference signals, control information, and data.
  • Reference signals are predetermined signals that facilitate the communications between the BSs 105 and the UEs 115.
  • a reference signal can have a particular pilot pattern or structure, where pilot tones may span across an operational BW or frequency band, each positioned at a pre-defined time and a pre-defined frequency.
  • a BS 105 may transmit cell specific reference signals (CRSs) and/or channel state information –reference signals (CSI-RSs) to enable a UE 115 to estimate a DL channel.
  • CRSs cell specific reference signals
  • CSI-RSs channel state information –reference signals
  • a UE 115 may transmit sounding reference signals (SRSs) to enable a BS 105 to estimate an UL channel.
  • Control information may include resource assignments and protocol controls.
  • Data may include protocol data and/or operational data.
  • the BSs 105 and the UEs 115 may communicate using self-contained subframes.
  • a self-contained subframe may include a portion for DL communication and a portion for UL communication.
  • a self-contained subframe can be DL-centric or UL-centric.
  • a DL-centric subframe may include a longer duration for DL communication than for UL communication.
  • An UL-centric subframe may include a longer duration for UL communication than for DL communication.
  • the network 100 may be an NR network deployed over a licensed spectrum.
  • the BSs 105 can transmit synchronization signals (e.g., including a primary synchronization signal (PSS) and a secondary synchronization signal (SSS) ) in the network 100 to facilitate synchronization.
  • the BSs 105 can broadcast system information associated with the network 100 (e.g., including a master information block (MIB) , remaining system information (RMSI) , and other system information (OSI) ) to facilitate initial network access.
  • MIB master information block
  • RMSI remaining system information
  • OSI system information
  • the BSs 105 may broadcast the PSS, the SSS, and/or the MIB in the form of synchronization signal block (SSBs) over a physical broadcast channel (PBCH) and may broadcast the RMSI and/or the OSI over a physical downlink shared channel (PDSCH) .
  • PBCH physical broadcast channel
  • PDSCH physical downlink shared channel
  • a UE 115 attempting to access the network 100 may perform an initial cell search by detecting a PSS from a BS 105.
  • the PSS may enable synchronization of period timing and may indicate a physical layer identity value.
  • the UE 115 may then receive a SSS.
  • the SSS may enable radio frame synchronization, and may provide a cell identity value, which may be combined with the physical layer identity value to identify the cell.
  • the PSS and the SSS may be located in a central portion of a carrier or any suitable frequencies within the carrier.
  • the UE 115 may receive a MIB, which may be transmitted in the physical broadcast channel (PBCH) .
  • the MIB may include system information for initial network access and scheduling information for RMSI and/or OSI.
  • the UE 115 may receive RMSI, OSI, and/or one or more system information blocks (SIBs) .
  • the RMSI and/or OSI may include radio resource control (RRC) information related to random access channel (RACH) procedures, paging, control resource set (CORESET) for physical downlink control channel (PDCCH) monitoring, physical UL control channel (PUCCH) , physical UL shared channel (PUSCH) , power control, and SRS.
  • RRC radio resource control
  • SIB1 may contain cell access parameters and scheduling information for other SIBs.
  • the UE 115 can perform a random access procedure to establish a connection with the BS 105. After establishing a connection, the UE 115 and the BS 105 can enter a normal operation stage, where operational data may be exchanged. For example, the BS 105 may schedule the UE 115 for UL and/or DL communications. The BS 105 may transmit UL and/or DL scheduling grants to the UE 115 via a PDCCH. The scheduling grants may be transmitted in the form of DL control information (DCI) .
  • DCI DL control information
  • the BS 105 may transmit a DL communication signal (e.g., carrying data) to the UE 115 via a PDSCH according to a DL scheduling grant.
  • the UE 115 may transmit an UL communication signal to the BS 105 via a PUSCH and/or PUCCH according to an UL scheduling grant.
  • the network 100 may operate over a system BW or a component carrier (CC) BW.
  • the network 100 may partition the system BW into multiple BWPs (e.g., portions) .
  • a BS 105 may dynamically assign a UE 115 to operate over a certain BWP (e.g., acertain portion of the system BW) .
  • the assigned BWP may be referred to as the active BWP.
  • the UE 115 may monitor the active BWP for signaling information from the BS 105.
  • the BS 105 may schedule the UE 115 for UL or DL communications in the active BWP.
  • a BS 105 may assign a pair of BWPs within the CC to a UE 115 for UL and DL communications.
  • the BWP pair may include one BWP for UL communications and one BWP for DL communications.
  • the network 100 may be an NR network deployed over a licensed or unlicensed spectrum.
  • the network 100 may operate over a shared channel, which may include shared frequency bands or unlicensed frequency bands, for example, at about 3.5 gigahertz (GHz) , sub-6 GHz or higher frequencies in the mmWav band.
  • a wireless communication device may share resources in the shared communication medium and may employ a listen-before-talk (LBT) procedure to reserve transmission opportunities (TXOPs) in the shared medium for communications.
  • TXOPs may be non-continuous in time and may refer to an amount of time a station can send frames when it has won contention for the wireless medium.
  • Each TXOP may include a plurality of slots and one or more medium sensing periods.
  • a TXOP may also be referred to as channel occupancy time (COT) .
  • COT channel occupancy time
  • a wireless communication device may perform an LBT (e.g., based on energy detection and/or signal detection) in the shared channel.
  • LBT is a channel access scheme that may be used in the unlicensed spectrum.
  • the wireless communication device may access the shared medium to transmit and/or receive data.
  • the BS 105 may perform an LBT in a frequency band prior to transmitting in the frequency band and may transmit in one or more channels based on the LBT result.
  • the BS 105 may perform a DL transmission, receive a UL transmission from the UE 115, and/or schedule the UE 115 for data transmission and/or reception within a COT. If the channel is not available (performance of the LBT results in a LBT fail) , the BS 105 does not gain access to the shared medium for data scheduling or transmission. The BS 105 may back off and perform the LBT procedure again at a later point in time. In another example, the UE 115 may perform an LBT in the frequency band prior to transmitting in the frequency band and may transmit in one or more channels based on the LBT result.
  • the UE 115 may perform an UL transmission or receive a DL transmission from the BS 105. If the channel is not available (performance of the LBT results in a LBT fail) , the UE 115 may back off and perform the LBT procedure again at a later point in time.
  • FIG. 2 is a timing diagram illustrating a communication scheme 200 for a UE having different energy detection thresholds for performing LBT according to some aspects of the present disclosure.
  • the scheme 200 may be employed by a BS 205 and a UE 215 in a network such as the network 100.
  • the BS 205 may correspond to BSs such as the BSs 105 and the UE 215 may correspond to UEs such as the UEs 115.
  • the BS 205 and the UE 215 may employ the scheme 200 for various communications, including without limitation UL transmissions during a COT that is not shared with the BS and for UL-to-DL COT sharing in a frequency spectrum (e.g., an unlicensed spectrum or a shared spectrum) shared by multiple network operating entities.
  • the x-axis represents time in some arbitrary units.
  • the UE 215 may determine an energy detection threshold 218 for acquiring a COT 220.
  • the UE 215 may contend for the COT 220 by performing a CAT4 LBT 222 in a shared channel. Upon passing the CAT4 LBT 222, the COT 220 may begin. Accordingly, the UE 215 may acquire the COT 220 based on the energy detection threshold 218.
  • the UE 215 acquires the COT 220 based on the energy detection threshold 218 if the UE performs LBT using the energy detection threshold 218 and acquires the COT 220 if the LBT results in an LBT pass.
  • a duration of the COT 220 starts at time T0 and ends at time T1, and a duration of the COT 220 can be for exclusive use by the UE 215. If the duration of the COT 220 is for exclusive use by the UE 215, then the UE 215 does not share the COT 220 with the BS 205.
  • An energy detection threshold may correspond to a COT if the UE 215 and/or the BS 205 performs LBT based on the energy detection threshold and acquires the COT upon an LBT pass. If the energy detection threshold 218 corresponds to a COT that is not shared with the BS 205, the energy detection threshold 218 may be based on the maximum transmit power of the UE.
  • the UE 215 transmits an UL communication signal 224 including UL data and/or UL control information (UCI) .
  • the UL data may be carried in a PUSCH
  • the UCI may be carried in a PUCCH.
  • the UCI may include a scheduling request, channel information (e.g., CSI reports) , and/or hybrid automatic repeat request (HARQ) acknowledgement/negative-acknowledgement (ACK/NACK) feedbacks.
  • the UE may acquire COTs based on the energy detection threshold 218 for UL transmissions such as configured grant (CG) -PUSCH and scheduled PUSCH with UL grant.
  • CG configured grant
  • PUSCH configured grant
  • a BS may schedule a UE for UL and/or DL communications.
  • the UE may transmit an UL data signal via an UL scheduling grant and/or may receive a DL data signal via a DL scheduling grant.
  • the UE may transmit a UL communication signal in a configured grant resource.
  • a configured grant may also be referred to as a grant-free grant, unscheduled grant, or autonomous grant.
  • the resources and other parameters used by the UE for a configured grant transmission may be provided by the BS in one or more of a RRC configuration or an activation DCI, without an explicit grant for each UE transmission.
  • a configured grant may be used to configure a UE for periodic transmission on, for example, specific resource blocks.
  • a COT (e.g., the COT 220 and/or COT 240) acquired from a CAT4 LBT (e.g., the CAT4 LBTs 222 and/or 242) may have a certain COT duration based on regulation for the spectrum in use.
  • the duration of the COT 220 is for exclusive use by the UE 215, the UE 215 may not use the entire duration of the COT 220 for transmitting the UL communication signal 224.
  • the COT 220 may have a duration of about 6 ms, but the UL communication signal 224 may span a duration of about 2 ms. Thus, the remaining 4 ms may be unused.
  • the UE 215 may share the COT 220 with the BS 205 for DL communications to reduce wasted resources.
  • the BS 205 may transmit a DL communication signal during a portion of the 4 ms that would have originally been left unused by the UE 215 in a non-COT sharing scenario.
  • the UE 215 may acquire a COT 240 for an UL transmission (e.g., configured grant-uplink (CG-UL) or scheduled UL transmission) and share the COT with the BS 205 for DL communications. Accordingly, the UE 215 and the BS 205 may communicate using UL-to-DL COT sharing.
  • the UE 215 may determine an energy detection threshold 238 indicated by COT sharing information 239 for acquiring the COT 240.
  • the COT sharing information 239 is associated with the COT 240 and may include, for example, an indication of whether the UE will share a COT, an energy detection threshold to use for performing LBT, etc.
  • the BS may generate the COT sharing information and may provide it to the UE for indicating to the UE whether to share a COT with the BS and/or the energy detection threshold for acquiring a COT.
  • the UE may generate the COT sharing information and may provide it to the BS for indicating to the BS whether the UE will or will not share a COT with the BS and/or the energy detection threshold used by the UE for acquiring a COT.
  • the UE may contend for the COT 240 by performing a CAT4 LBT 242 in the shared channel. Upon passing the CAT4 LBT 242, the COT 240 may begin.
  • the UE may acquire the COT 240 based on the energy detection threshold 238, which is based on the maximum transmit power of the BS.
  • a UE may acquire a COT based on an energy detection threshold if the UE performs an LBT using the energy detection threshold and acquires the COT if the LBT passes.
  • a duration of the COT 240 starts at time T2 and ends at time T4, and the COT 240 may be shared with the BS 205.
  • An entire duration of the COT 240 is not for exclusive use by the UE 215 because at least a portion of the COT 240 may be used by the BS 205 for DL transmissions.
  • the energy detection threshold 238 is used for acquiring a COT that is shared with the BS 205, the UE 215 and the BS 205 may both perform LBT using the energy detection threshold 238. Accordingly, the energy detection threshold 238 may be based on the maximum transmit power of the BS.
  • the BS 205 may be unable to detect the UE 215 in the channel.
  • the UE 215 transmits an UL communication signal 244 including UL data and/or UCI. Additionally, the UE 215 may use the energy detection threshold 238 for UL transmissions (e.g., CG-PUSCH or scheduled PUSCH with UL grant) and/or UL-to-DL COT sharing. Additionally, the UE 215 may acquire COTs based on the energy detection threshold 238 for UL transmissions such as configured grant (CG) -PUSCH and scheduled PUSCH with UL grant.
  • CG configured grant
  • the COT 240 may include a duration longer than the transmission duration of the UL communication signal 244. Accordingly, the UE 215 may share at least a portion of the remaining duration of the COT 240 with the BS 205 for DL communication.
  • the UE 215 may obtain the COT sharing information 239 by receiving it from the BS 205 or by generating the COT sharing information 239, as will be discussed further below.
  • the COT sharing information 239 may indicate that the BS 205 is allowed to share the COT 240 with the UE 215 for DL communication.
  • the COT sharing information 239 may indicate a sharable portion of the COT 240 starting at a time 250 (e.g., at time T3) with a duration 252 as shown by a dashed-dotted box 260.
  • the BS 205 may contend for the COT 240 by performing an LBT 254 based on the energy detection threshold 238 in the shared channel.
  • the energy detection threshold 238 is based on the maximum transmit power of the BS. Accordingly, the BS 205 may acquire a portion of the COT 240 based on the energy detection threshold 238.
  • the BS 205 may transmit a DL communication signal 256 during a first portion of the COT 240 (e.g., during a period within the sharable duration 252) .
  • the DL communication signal 256 may include DL control information (e.g., DL scheduling grants) and/or DL data.
  • the BS 205 may be allowed to use the COT 240 of UE 215 for DL and/or UL communications with the UE 215 and may not be allowed to use the COT 240 for communications with another UE (e.g., UE 115 in FIG. 1) .
  • the BS 205 may be allowed to use the shared portion of COT 240 for DL communications with another UE (e.g., UE 115 in FIG. 1) . If the duration 252 of the COT sharing is shorter than a remaining duration of the COT 240, then the UE 215 may transmit an UL communication signal during a second portion of the COT 240.
  • the UE 215 may acquire the COT based on an energy detection threshold (e.g., energy detection threshold 218) that is based on the maximum transmit power of the UE 215. If the UE-acquired COT is shared with the BS, then the UE 215 may acquire the COT based on an energy detection threshold (e.g., energy detection threshold 238) that is based on the maximum transmit power of the BS 205.
  • the maximum transmit power of the BS 205 may be higher (e.g., 1 dB, 5 dB, 10 dB, or otherwise) than the maximum transmit power of the UE 215.
  • the energy detection thresholds 218 and 238 may be different.
  • the BS 205 may assign the particular energy detection threshold for the UE 215 to use for performing LBT or the UE 215 may determine the energy detection threshold and indicate the energy detection threshold to the BS 205.
  • the UE 215 acquires the COT 220 that is not shared with the BS before acquiring the COT 240 that is shared with the BS, it should be understood that the order of the COTs is independent from each other. For example, after acquiringthe COT 240, the UE 215 may acquire a COT that is not shared with the BS 205.
  • FIG. 3 is a block diagram of a UE 300 according to some aspects of the present disclosure.
  • the UE 300 may be a UE 115 discussed above in FIG. 1.
  • the UE 300 may include a processor 302, a memory 304, a COT sharing module 308, a transceiver 310 including a modem subsystem 312 and a radio frequency (RF) unit 314, and one or more antennas 316.
  • These elements may be in direct or indirect communication with each other, for example via one or more buses.
  • the processor 302 may include a central processing unit (CPU) , a digital signal processor (DSP) , an application specific integrated circuit (ASIC) , a controller, a field programmable gate array (FPGA) device, another hardware device, a firmware device, or any combination thereof configured to perform the operations described herein.
  • the processor 302 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.
  • the memory 304 may include a cache memory (e.g., a cache memory of the processor 302) , random access memory (RAM) , magnetoresistive RAM (MRAM) , read-only memory (ROM) , programmable read-only memory (PROM) , erasable programmable read only memory (EPROM) , electrically erasable programmable read only memory (EEPROM) , flash memory, solid state memory device, hard disk drives, other forms of volatile and non-volatile memory, or a combination of different types of memory.
  • the memory 304 includes a non-transitory computer-readable medium.
  • the memory 304 may store, or have recorded thereon, instructions 306.
  • the instructions 306 may include instructions that, when executed by the processor 302, cause the processor 302 to perform the operations described herein with reference to the UEs 115 in connection with aspects of the present disclosure, for example, aspects of FIGs. 1-3 and 5-9. Instructions 306 may also be referred to as program code.
  • the programcode may be for causing a wireless communication device to perform these operations, for example by causing one or more processors (such as processor 302) to control or command the wireless communication device to do so.
  • the terms “instructions” and “code” should be interpreted broadly to include any type of computer-readable statement (s) .
  • the terms “instructions” and “code” may refer to one or more programs, routines, sub-routines, functions, procedures, etc. “Instructions” and “code” may include a single computer-readable statement or many computer-readable statements.
  • the COT sharing module 308 may be implemented via hardware, software, or combinations thereof.
  • the COT sharing module 308 may be implemented as a processor, circuit, and/or instructions 306 stored in the memory 304 and executed by the processor 302. In some instances, the COT sharing module 308 can be integrated within the modem subsystem 312.
  • the COT sharing module 308 can be implemented by a combination of software components (e.g., executed by a DSP or a general processor) and hardware components (e.g., logic gates and circuitry) within the modem subsystem 312.
  • the COT sharing module 308 may be used for various aspects of the present disclosure, for example, aspects of FIGs. 1-3 and 5-9.
  • the COT sharing module 308 may be configured to acquire a first COT based on a first energy detection threshold, where a duration of the COT is for exclusive use by the UE.
  • the COT sharing module 308 may be configured to acquire a second COT based on a second energy detection threshold indicated by COT sharing information associated with the second COT, where the first energy detection threshold is different from the second energy detection threshold.
  • the COT sharing module 308 may be configured to receive from a BS, a DL communication signal during a first portion of the second COT based on the COT sharing information.
  • the transceiver 310 may include the modem subsystem 312 and the RF unit 314.
  • the transceiver 310 can be configured to communicate bi-directionally with other devices, such as the BSs 105 or BS 400.
  • the modem subsystem 312 may be configured to modulate and/or encode the data from the memory 304 and/or the COT sharing module 308 according to a modulation and coding scheme (MCS) , e.g., a low-density parity check (LDPC) coding scheme, a turbo coding scheme, a convolutional coding scheme, a digital beamforming scheme, etc.
  • MCS modulation and coding scheme
  • LDPC low-density parity check
  • the RF unit314 may be configured to process (e.g., perform analog to digital conversion or digital to analog conversion, etc.
  • the RF unit314 may be further configured to perform analog beamforming in conjunction with the digital beamforming. Although shown as integrated together in transceiver 310, the modem subsystem 312 and the RF unit 314 may be separate devices that are coupled together at the UE 115 to enable the UE 115 to communicate with other devices.
  • the RF unit 314 may provide the modulated and/or processed data, e.g. data packets (or, more generally, data messages that may contain one or more data packets and other information) , to the antennas 316 for transmission to one or more other devices.
  • the antennas 316 may further receive data messages transmitted from other devices.
  • the antennas 316 may provide the received data messages for processing and/or demodulation at the transceiver 310.
  • the transceiver 310 may provide the demodulated and decoded data (e.g., first energy detection threshold, second energy detection threshold, a DL communication signal, COT sharing information) to the COT sharing module 308 for processing.
  • the antennas 316 may include multiple antennas of similar or different designs in order to sustain multiple transmission links.
  • the RF unit 314 may configure the antennas 316.
  • the antenna (s) 316 may correspond to the antenna element (s) or port (s) discussed in the present disclosure.
  • the transceiver 310 is configured to transmit an UL communication, receive COT sharing information indicating an energy detection threshold for a COT, receive a DL communication based on COT sharing information, by coordinating with the COT sharing module 308.
  • the UE 300 can include multiple transceivers 310 implementing different radio access technologies (RATs) (e.g., NR and LTE) .
  • RATs radio access technologies
  • the UE 300 can include a single transceiver 310 implementing multiple RATs (e.g., NR and LTE) .
  • the transceiver 310 can include various components, where different combinations of components can implement different RATs.
  • FIG. 4 is a block diagram of a BS 400 according to some aspects of the present disclosure.
  • the BS 400 may be a BS 105 as discussed above in FIG. 1.
  • the BS 400 may include a processor 402, a memory 404, a COT sharing module 408, a transceiver 410 including a modem subsystem 412 and a RF unit 414, and one or more antennas 416. These elements may be in direct or indirect communication with each other, for example via one or more buses.
  • the processor 402 may have various features as a specific-type processor. For example, these may include a CPU, a DSP, an ASIC, a controller, a FPGA device, another hardware device, a firmware device, or any combination thereof configured to perform the operations described herein.
  • the processor 402 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.
  • the memory 404 may include a cache memory (e.g., a cache memory of the processor 402) , RAM, MRAM, ROM, PROM, EPROM, EEPROM, flash memory, a solid state memory device, one or more hard disk drives, memristor-based arrays, other forms of volatile and non-volatile memory, or a combination of different types of memory.
  • the memory 404 may include a non-transitory computer-readable medium.
  • the memory 404 may store instructions 406.
  • the instructions 406 may include instructions that, when executed by the processor 402, cause the processor 402 to perform operations described herein, for example, aspects of FIGs. 1, 2, 5-8, and 10. Instructions 406 may also be referred to as code, which may be interpreted broadly to include any type of computer-readable statement (s) as discussed above with respect to FIG. 3.
  • the COT sharing module 408 may be implemented via hardware, software, or combinations thereof.
  • the COT sharing module 408 may be implemented as a processor, circuit, and/or instructions 406 stored in the memory 404 and executed by the processor 402. In some instances, the COT sharing module 408 can be integrated within the modem subsystem 412.
  • the COT sharing module 408 can be implemented by a combination of software components (e.g., executed by a DSP or a general processor) and hardware components (e.g., logic gates and circuitry) within the modem subsystem 412.
  • the COT sharing module 408 may be used for various aspects of the present disclosure, for example, aspects of FIGs. 1, 2, 5-8, and 10.
  • the COT sharing module 408 may be configured to receive from a UE, an UL communication signal during a first UE-acquired COT based on a first energy detection threshold, where a duration of the first COT is for exclusive use by the UE.
  • the COT sharing module 408 may be configured to acquire a duration of a second UE-acquired COT based on a second energy detection threshold indicated by COT sharing information associated with the second UE-acquired COT, where the first energy detection threshold is different from the second energy detection threshold.
  • the COT sharing module 408 may be configured to transmit to the UE, a DL communication signal during the duration of the second UE-acquired COT.
  • the transceiver 410 may include the modem subsystem 412 and the RF unit 414.
  • the transceiver 410 can be configured to communicate bi-directionally with other devices, such as the UEs 115 and/or 300 and/or another core network element.
  • the modem subsystem 412 may be configured to modulate and/or encode data according to a MCS, e.g., a LDPC coding scheme, a turbo coding scheme, a convolutional coding scheme, a digital beamforming scheme, etc.
  • the RF unit 414 may be configured to process (e.g., perform analog to digital conversion or digital to analog conversion, etc.
  • modulated/encoded data e.g., grants, resource allocations
  • the RF unit 414 may be further configured to perform analog beamforming in conjunction with the digital beamforming.
  • the modem subsystem 412 and/or the RF unit 414 may be separate devices that are coupled together at the BS 105 to enable the BS 105 to communicate with other devices.
  • the RF unit 414 may provide the modulated and/or processed data, e.g. data packets (or, more generally, data messages that may contain one or more data packets and other information) , to the antennas 416 for transmission to one or more other devices. This may include, for example, transmission of information to complete attachment to a network and communication with a camped UE 115 or 300 according to some aspects of the present disclosure.
  • the antennas 416 may further receive data messages transmitted from other devices and provide the received data messages for processing and/or demodulation at the transceiver 410.
  • the transceiver 410 may provide the demodulated and decoded data (e.g., first energy detection threshold, second energy detection threshold, a DL communication signal, COT sharing information) to the COT sharing module 408 for processing.
  • the antennas 416 may include multiple antennas of similar or different designs in order to sustain multiple transmission links.
  • the transceiver 410 is configured to receive an UL communication signal and transmit a DL communication signal, by coordinating with the COT sharing module 408.
  • the BS 400 can include multiple transceivers 410 implementing different RATs (e.g., NR and LTE) .
  • the BS 400 can include a single transceiver 410 implementing multiple RATs (e.g., NR and LTE) .
  • the transceiver 410 can include various components, where different combinations of components can implement different RATs.
  • Operations in unlicensed spectrum may include DL transmissions and/or UL transmissions.
  • An UL transmission (e.g., autonomous UL via a dynamic UL grant or scheduled UL transmission via a configured UL grant) in the licensed frequency band may occur under various circumstances.
  • a grantless or grant-free uplink transmission is an unscheduled transmission, performed on the channel without an UL grant.
  • a BS may schedule a UE for UL and/or DL communications. For example, the UE may transmit a UL data signal via an UL scheduling grant. Additionally, the UE may receive a DL data signal via a DL scheduling grant. In some examples, rather than wait for an UL grant, the UE may transmit a UL communication signal in a configured UL resource.
  • the BS may allocate configured UL resources in an unlicensed frequency band for UL or DL transmission.
  • the UL communication signal may include the CG-UL data.
  • the present disclosure provides techniques for determining an energy detection threshold for scheduled UL, CG
  • a BS may assign an energy detection threshold for a UE to use for acquiring a COT. For example, the BS may assign one energy detection threshold per PDCCH UL grant or configured UL grant. Referring back to FIG. 2, the BS may assign the energy detection threshold 238 to the UE for normal UL and UL-to-DL COT sharing. The BS may assign the energy detection threshold 238 to the UE, for example, if the transmission of DL data has a higher priority than the transmission of UL data or if the BS determines that the DL data should be transmitted first (even if this may result in no UL transmission by the UE) . The BS may assign the energy detection threshold 218 to the UE otherwise.
  • the energy detection threshold 218 may be used when a duration of a COT is for exclusive use by the UE (e.g., the UE does not share a COT with the BS) , and the energy detection threshold 238 may be used for COT sharing.
  • FIGs. 5 and 6 are timing diagrams illustrating communication schemes in which the BS assigns an energy detection threshold for the UE’s acquisition of a COT.
  • FIG. 5 is a timing diagram illustrating a communication scheme 500 for assigning an energy detection threshold for the UE according to some aspects of the present disclosure.
  • the scheme 500 may be employed by a BS 505 and a UE 515 in a network such as the network 100.
  • the BS 505 may correspond to BSs such as the BSs 105, 205, 400 and the UE 515 may correspond to UEs such as the UEs 115, 215, 300.
  • the x-axis represents time in some arbitrary units.
  • the BS 505 and the UE 515 may employ the scheme 500 for various communications, including without limitation UL transmissions and for UL-to-DL COT sharing in a frequency spectrum (e.g., an unlicensed spectrum or a shared spectrum) shared by multiple network operating entities.
  • the BS 505 and the UE 515 may use substantially similar LBT mechanisms as in the scheme 200 described in FIG. 2 to acquire a COT based on an indicated energy detection threshold.
  • a BS 505 may acquire a COT 502.
  • the BS may transmit DCI 504 indicating an UL scheduling grant 506 for a scheduled UL transmission (e.g., UL communication signal 224) .
  • the UL scheduling grant 506 may include an energy detection threshold indicator 518 indicating an energy detection threshold for the UE to apply when performing LBT.
  • the UE may acquire a COT 220 based on the energy detection threshold indicated by the energy detection threshold indicator 518.
  • the BS 505 may include a bit in the UL grant 506 for dynamically granted PUSCH that provides the energy detection threshold indicator 518.
  • the BS 505 may set the energy detection threshold indicator 518 to “0” , which indicates for the UE 505 to acquire the COT 220 based on the energy detection threshold 218 (in FIG. 2) and to not share the COT 220. If the BS 505 plans to share the COT 220 with the UE 515, the BS 505 may set the energy detection threshold indicator 518 to “1” , which indicates for the UE to acquire the COT 220 based on the energy detection threshold 238 (in FIG. 2) and to share the COT 220.
  • the energy detection threshold indicator 518 is “0” and indicates to the UE 515 to utilize the energy detection threshold 218, which is based on the maximum transmit power of the UE.
  • the BS 505 may transmit the UL scheduling grant 506 in the COT 502 to schedule the UE 515 for an UL transmission at a time T0 outside of the COT 502 acquired by the BS 505.
  • the UE 515 receives the DCI 504 from the BS 505 and determines, based on the energy detection threshold indicator 518 (i.e., “0” ) included in the DCI 504, to apply the energy detection threshold 218 for a CAT4 LBT 222.
  • the UE 515 performs the CAT4 LBT 222 prior to the scheduled time T0.
  • the UE 515 acquires the COT 220 and transmits an UL communication signal 224 beginning at the scheduled time T0 according to the UL scheduling grant 506.
  • the UE 515 does not share the COT 220 with the BS 505, and a duration of the COT 220 between time T0 and T1 is for exclusive use by the UE 515.
  • the BS 505 may acquire a COT 532.
  • the BS may transmit DCI 534 including COT sharing information 539.
  • the BS 505 may include the COT sharing information 539 in the DCI 534, and the COT sharing information 539 may indicate that the UE 515 will share the COT 240 with the BS 505.
  • the COT sharing information 539 may indicate a sharable portion of the COT 240 starting at the time 250 (e.g., at time T3) with a duration 252 as shown by a dashed-dotted box 560.
  • the COT sharing information 539 may include an UL scheduling grant 536 for a scheduled UL transmission (e.g., UL communication signal 244) .
  • the UL scheduling grant 536 may include an energy detection threshold indicator 538 that indicates an energy detection threshold for the UE 515 to apply when performing LBT.
  • the UE 515 may acquire the COT 240 based on the energy detection threshold indicated by the energy detection threshold indicator 538.
  • the BS 505 may include a bit in the UL grant 536 for dynamically granted PUSCH that provides the energy detection threshold indicator 538. As shown by the “X” over the 0 bit, the energy detection threshold indicator 538 is “1” and indicates to the UE 515 to utilize the energy detection threshold 238, which is based on the maximum transmit power of the BS 505.
  • the BS 505 may transmit the UL scheduling grant 536 in the COT 532 to schedule the UE for an UL transmission at a time T2 outside the BS’s COT 532.
  • the UL communication signal 244 may be a PUSCH signal and the COT sharing information 539 may be a DCI message.
  • the UE 515 receives the DCI 534 from the BS 505 and determines, based on the energy detection threshold indicator 538 (i.e., “1” ) included in the DCI 534, to apply the energy detection threshold 238 for a CAT4 LBT 242.
  • the UE 515 performs the CAT4 LBT 242 prior to the scheduled time T2.
  • the UE 515 acquires the COT 240 and transmits an UL communication signal 244 beginning at the scheduled time T2 according to the UL scheduling grant 536.
  • the COT 240 may include a duration longer than the transmission duration of the UL communication signal 244.
  • the COT 240 may end at time T4.
  • the UE 515 shares the COT 240 with the BS 505. Accordingly, the BS 505 may use at least a portion of the COT 240 for DL transmissions to the UE 515.
  • the BS 505 may perform an LBT 254 (e.g., CAT4 or CAT2 LBT) and transmit a DL communication signal 256 during a period within the sharable duration 252.
  • the DL communication signal 256 may include DL control information and/or DL data.
  • the BS 505 may be allowed to use the COT 240 for DL and/or UL communications with the UE and may not be allowed to use the UE’s COT 240 for communication with another UE (e.g., UE 115 in FIG. 1) . In some instances, the BS 505 may be allowed to use the shared portion of COT 240 for DL communications with another UE (e.g., UE 115 in FIG. 1) .
  • FIG. 6 is a timing diagram illustrating a communication scheme 600 for assigning an energy detection threshold for the UE according to some aspects of the present disclosure.
  • the scheme 600 may be employed by a BS 605 and a UE 615 in a network such as the network 100.
  • the BS 605 may correspond to BSs such as the BSs 105 205 400 505 and the UE 615 may correspond to UEs such as the UEs 115, 215, 300, 515.
  • the x-axis represents time in some arbitrary units.
  • the BS 605 and the UE 615 may employ the scheme 600 for various communications, including without limitation UL transmissions and for UL-to-DL COT sharing in a frequency spectrum (e.g., an unlicensed spectrum or a shared spectrum) shared by multiple network operating entities.
  • the BS 605 and the UE 615 may use substantially similar LBT mechanisms as in the scheme 200 described in FIG. 2 to acquire a COT based on an indicated energy detection threshold.
  • the BS 605 may configure the UE 615 with configured UL resources 660 and 662.
  • the BS 605 may acquire a COT 602 after an LBT pass.
  • the BS 605 may transmit DCI 604 to activate the configured resource 660 with an energy detection threshold indicated by an energy detection threshold indicator 618.
  • the activation of the configured resource 660 may refer to an indication field in the DCI 604.
  • the BS 605 may transmit the DCI 604 including the energy detection threshold indicator 618.
  • the energy detection threshold indicator 618 may indicate an energy detection threshold for the UE to apply when performing LBT.
  • the UE 615 may acquire a COT 620 based on the energy detection threshold indicated by the energy detection threshold indicator 618.
  • the BS may include a bit in the DCI 604 to indicate the energy detection threshold indicated by the energy detection threshold indicator 618 for CG-UL. If the BS 605 does not plan to share the COT 620 with the UE 615, the BS 605 may set the energy detection threshold indicator 618 to “0” , which indicates for the UE 615 to acquire the COT 620 based on the energy detection threshold 218 (in FIG. 2) and to not share the COT 620. If the BS 605 plans to share the COT 620 with the UE 615, the BS may set the energy detection threshold indicator 618 to “1” , which indicates for the UE 615 to acquire the COT 620 based on the energy detection threshold 238 (in FIG.
  • the energy detection threshold indicator 618 is “0” and indicates to the UE 615 to utilize the energy detection threshold 218, which is based on the maximum transmit power of the UE 615.
  • the UE 615 receives the DCI 604 from the BS 605 and determines, based on the energy detection threshold indicator 618 (i.e., “0” ) included in the DCI 604, to apply the energy detection threshold 218 for the CAT4 LBT 222 and to not share the COT 620 with the BS.
  • the UE 615 performs the CAT4 LBT 222 prior to the scheduled time T0.
  • the UE 615 acquires the COT 620 and transmits an UL communication signal 224.
  • the UE 515 does not share the COT 620 with the BS 505, and a duration of the COT 620 between time T0 and T1 is for exclusive use by the UE 615.
  • the BS 605 may acquire a COT 632 after an LBT pass.
  • the BS may transmit DCI 634 including COT sharing information 639.
  • the BS 605 may include the COT sharing information 639 in the DCI 634, and the COT sharing information 639 may indicate that the UE 615 will share the COT 640 with the BS 605.
  • the COT sharing information 639 may indicate a sharable portion of the COT 640 starting at the time 250 (e.g., at time T3) with the duration 252 as shown by a dashed-dotted box 659.
  • the COT sharing information 639 may include an energy detection threshold indicator 638 that indicates an energy detection threshold for the UE 615 to apply when performing LBT.
  • the UE 615 may acquire the COT 640 based on the energy detection threshold indicated by the energy detection threshold indicator 638.
  • the BS 605 may include a bit in the DCI 634 or COT sharing information 639 to activate the configured UL resource 662 with an energy detection threshold indicated by the energy detection threshold indicator 638 for CG-UL.
  • the BS may transmit the DCI 634 including the energy detection threshold indicator 638.
  • the energy detection threshold indicator 638 is “1” and indicates to the UE 615 to utilize the energy detection threshold indicated by the energy detection threshold indicator 638, which is based on the maximum transmit power of the BS 605.
  • the UL communication signal 244 may be CG-UL data and the COT sharing information 639 may be a DCI message.
  • the UE 615 receives the DCI 634 from the BS 605 and determines, based on the energy detection threshold indicator 638 (i.e., “1” ) included in the DCI 634, to apply the energy detection threshold 238 for the CAT4 LBT 242 and to share the COT 620 with the BS 605.
  • the BS 605 may perform an LBT 254 (e.g., CAT4 or CAT2 LBT) . If the LBT 254 results in an LBT pass, the BS 605 may transmit to the UE 615, a DL communication signal 256 during a portion of the COT 640 (e.g., within the sharable duration 252) .
  • the BS 605 may be allowed to use the COT 640 for DL and/or UL communications with the UE 605 and may not be allowed to use the COT 240 for communication with another UE (e.g., UE 115 in FIG. 1) . In some instances, the BS 605 may be allowed to use the shared portion of the COT 640 for DL communications with another UE (e.g., UE 115 in FIG. 1) .
  • the energy detection threshold indicators 618, 638 and/or the energy detection thresholds 218, 238 may be separately configured to be applicable to scheduled UL, CG-UL, or both scheduled UL and CG-UL.
  • the BS 605 and/or the UE 615 may configure whether the energy detection threshold indicator 618 and/or the energy detection threshold 218, based on the maximum transmit power of the UE 615, is/are applicable to the scheduled UL, the CG-UL, or both.
  • the BS 605 and/or the UE 615 may configure whether the energy detection threshold indicator 638 and/or the energy detection threshold 238, based on the maximum transmit power of the BS 605, is/are applicable to the scheduled UL, the CG-UL, or both.
  • FIGs. 5 and 6 describe the BS assigning the threshold to the UE, in other aspects of the present disclosure, the UE determines the threshold and provides an indication of the energy detection threshold to the BS.
  • FIGs. 7 and 8 are timing diagrams illustrating communication schemes in which the UE determines the energy detection threshold for acquiring a COT and indicates the energy detection threshold to the BS. Accordingly, the BS may be aware of the UE’s energy detection threshold for acquiring an LBT.
  • FIG. 7 is a timing diagram illustrating a communication scheme 700 for a UE to indicate an energy detection threshold to the BS according to some aspects of the present disclosure.
  • the scheme 700 may be employed by a BS 705 and a UE 715 in a network such as the network 100.
  • the BS 705 may correspond to BSs such as the BSs 105, 400, 505, 605 and the UE 715 may correspond to UEs such as the UEs 115, 300, 515, 615.
  • the x-axis represents time in some arbitrary units.
  • the BS 705 and the UE 715 may employ the scheme 700 for various communications, including without limitation UL transmissions during a COT that is not shared with the BS and for UL-to-DL COT sharing in a frequency spectrum (e.g., an unlicensed spectrum or a shared spectrum) shared by multiple network operating entities.
  • a frequency spectrum e.g., an unlicensed spectrum or a shared spectrum
  • the UE 715 may perform a CAT4 LBT 722 based on the energy detection threshold 218 and may perform a CAT4 LBT 742 based on the energy detection threshold 238.
  • the UE 715 may select the energy detection threshold based on a variety of ways.
  • the UE may select an energy detection threshold when performing the CAT4 LBTs based on two extended clear channel assessments (eCCA) with two energy detection thresholds in parallel.
  • eCCA extended clear channel assessments
  • a CAT4 LBT may be referred to as an eCCA, where backoff mechanisms may be used with CCA.
  • eCCA may be used interchangeably with “LBT” or “CAT4 LBT” in the present disclosure.
  • the UE 715 may listen to the channel and perform measurements, and the energy measurements may be shared. Accordingly, one common hardware may be used for performing the CAT4 LBT 722, 742 and the resulting energy measurement may be compared with the two energy detection thresholds 218 and 238.
  • the UE 715 may acquire a COT 720 and may transmit an UL communication signal 724 during the COT 720 to the BS 705.
  • the UL communication signal 724 may include a bit of information that is carried in UL to indicate a sharable portion of the COT 720.
  • the UL communication signal 724 may include COT sharing information 739 including the bit. In FIG. 7, the UE 715 does not plan to share the COT 720 with the BS 705.
  • the UE 715 may set the bit to “0” , which indicates to the BS 705 that the UE 715 is using the energy detection threshold 218 for performing LBT and further indicates to the BS 705 that the duration of the COT 720 is for exclusive use by the UE 715.
  • the UE 715 may transmit the UL communication 724 including the COT sharing information 739 to the BS 705.
  • the BS 705 may receive from the UE 715 during the COT 720 the UL communication 724 and determine based on the COT sharing information 739, that the BS 705 should not attempt to share the COT 720 with the UE 715. Additionally, the BS 705 may determine, based on the COT sharing information 739, that the UE 715 used the energy detection threshold 218 for acquiring the COT 720.
  • the UE 715 may acquire a COT 740 and transmit an UL communication signal 744 during the COT 740 to the BS 705.
  • the UL communication signal 744 may include a bit of information that is carried in UL to indicate a sharable portion of the COT 740 starting at time 750 (e.g., T1) with a duration 752 as shown by a dashed-dotted box 760.
  • the UL communication signal 744 may include COT sharing information 769 including a bit indicating an energy detection threshold.
  • the UE 715 plans to share the COT 740 with the BS 705.
  • the UE 715 may set the bit to “1” , which indicates to the BS 705 that the UE 715 used the energy detection threshold 238 for acquiring the COT 740 and further indicates to the BS 705 UL-to-DL sharing of the COT 740.
  • the UE 715 may transmit the UL communication 744 including the COT sharing information 769.
  • the UE 715 shares the COT (e.g., COT 740) with the BS 705.
  • COT e.g., COT 740
  • the BS 705 may receive from the UE 715 during the COT 704, the UL communication 744 and determine, based on the COT sharing information 769, that the BS 705 may share the COT 740 with the UE 715. The BS 705 may also determine, based on the COT sharing information 769, the energy detection threshold 238 used by the UE 715 for acquiring the COT 740. The BS 705 may perform an LBT 754. If the LBT 754 results in an LBT pass, the BS 705 may transmit to the UE 715 during a portion of the COT 740, a DL communication signal 756. The BS 705 may transmit the DL communication 756 within the duration 752 of the shared portion of the COT 740. The UE may later transmit an UL communication to the BS during the COT 740.
  • the UE 715 may implement various techniques for signaling to the BS 705 whether the UE 715 will share a COT with the BS 705.
  • the UE 715 may include a bit in CG-UCI, where the bit indicates whether the UE 715 will share or not share a COT with the BS 705.
  • the UE 715 may transmit the CG-UCI to the BS 705, which may determine, based on the CG-UCI, that the COT acquired by the UE 715 is for exclusive use by the UE 715 (e.g., not shared) or that the COT is shared with the BS 705.
  • the UE 715 may use different masks for cyclic redundancy check (CRC) of CG-UCI.
  • the CRC may be used to protect the UCI.
  • a first masking sequence e.g., a default mask
  • COT e.g., COT 720
  • the UE 715 may use the first masking sequence for CRC of CG-UCI for indicating no COT sharing and/or the energy detection threshold (e.g., energy detection threshold 218) used by the UE 715 to the BS 705.
  • a second masking sequence may indicate that the UE acquired a COT (e.g., COT 740) based on the energy detection threshold 238.
  • the UE may use the second masking sequence for CRC of CG-UCI for indicating UL-to-DL COT sharing and/or the energy detection threshold (e.g., energy detection threshold 238) used by the UE 715 to the BS 705.
  • the BS 705 may receive the CG-UCI, decode the data, and determine, based on the decoded data, whether the UE 715 will share a COT with the BS 705 and/or the energy detection threshold applied by the UE 715 in acquiring the COT.
  • the UE 715 uses demodulation reference signals (DMRSs) in PUSCH to indicate an energy detection threshold (e.g., energy detection threshold 218 or 238) to the BS 705.
  • the DMRS may be specific to the UE 715, which may use the DMRS to estimate the radio channel.
  • the UE 715 may scramble the DMRS sequence and use different DMRS scrambling sequences to differentiate between the energy detection threshold 218 and the energy detection threshold 238. For example, the UE 715 may use a first DMRS scrambling sequence to indicate the energy detection threshold 218 used by the UE 715 and may use a second DMRS scrambling sequence to indicate the energy detection threshold 238 used by the UE 715.
  • the BS 705 may receive the DMRS in PUSCH and determine, based on detecting the DMRS scrambling, the energy detection threshold 218 or 238 used by the UE 715.
  • the energy detection threshold 238 may be separately configured to be applicable to scheduled UL, CG-UL, or both scheduled UL and CG-UL.
  • the BS 705 and/or the UE 715 may configure whether the energy detection threshold 238, based on the maximum transmit power of the BS 705, is applicable to the scheduled UL, the CG-UL, or both.
  • the UE 715 and/or the BS 705 may share the UE-acquired COT under certain conditions.
  • DCI is protected by CRC, and UCI is sometimes not protected by CRC.
  • the channel may not have CRC protection. If the UCI includes at least thirteen bits, CRC will be attached for protection of the UCI.
  • the signaling of whether to share a COT may be insufficiently protected.
  • the UE 715 may transmit the UCI to the BS 705 during a COT, but may determine, based on the determination that the UCI is not CRC protected, to not share the COT with the BS 705.
  • UCI may be transmitted over PUSCH. If the UE 715 transmits the UCI over PUSCH, the UCI is part of transport blocks or code blocks, and the CRC may be computed across the data and UCI together. The UE 715 may determine to share a COT with the BS 705 if transport blocks and/or code blocks transmitted in the PUSCH have CRC protection. The UE 715 may provide this indication to share the COT with the BS 705 in the COT sharing information (e.g., COT sharing information 769) .
  • COT sharing information e.g., COT sharing information 769
  • the BS 705 may ignore COT sharing signaling if the information is not CRC protected.
  • the BS 705 may determine whether a channel is CRC protected. If the channel is CRC protected and indicates COT sharing by the UE 715, the BS 705 may share the COT and transmit DL communications during a portion of the shared COT. If the channel is not CRC protected (even if the channel indicates COT sharing by the UE 715) , the BS 705 may determine to not share the COT with the UE 715.
  • the UE 715 may initially choose a particular energy detection threshold and may perform CAT4 LBT for only that energy detection threshold based on, for example, whether the UE 715 wants to share a COT and/or the duration of the COT to share. Accordingly, the UE 715 may be provided with more flexibility on whether the UE 715 wants to share a COT with the BS 705. For example, if the UE 715 does not want to share the COT 720 with the BS 705, the UE 715 may select the energy detection threshold 218 for acquisition of a COT and indicate the energy detection threshold 218 to the BS 705.
  • the UE 715 may select the energy detection threshold 238 for acquisition of a COT and indicate the energy detection threshold 238 to the BS 705. Additionally, the UE 715 may indicate in the COT sharing information 769 that the UE 715 will only share a particular portion of the COT 740 with the BS 705. For example, the UE 715 may provide particular start and end times in relation to the COT duration, where the start and end times indicate the shareable portion of the COT. Accordingly, the BS 705 may transmit DL communications to the UE 715 only within this particular portion of the shared COT 740.
  • the UE 715 may transmit an UL communication including COT sharing information indicating, for example, that the UE 715 will or will not share the COT with the BS and/or an amount of time or duration that the UE 715 will share the COT.
  • LBT schemes may include Load Based Equipment (LBE) and Frame Based Equipment (FBE) .
  • LBE Load Based Equipment
  • FBE Frame Based Equipment
  • the channel sensing is performed at any time instant and random back-off is used if the channel is found busy.
  • the discussion above may refer to LBE systems.
  • FBE channel sensing is performed at fixed time instants (e.g., contention period or clear channel assessment (CCA) ) , and if the channel is busy, the wireless communication device (e.g., BS or UE) backs off for a fixed time period and senses the channel again after this period. If the channel is free, the wireless communication device may use the next fixed frame period (FFP) for communicating DL and/or UL transmissions for up to a maximum COT.
  • FFP next fixed frame period
  • the FFP may also be referred to as a transmission period, which can be used for UL and/or DL transmissions.
  • the UE and/or the BS may perform a CAT4 LBT, and in an FBE system, the UE and/or the BS may perform a CAT2 LBT.
  • FIG. 8 illustrates an FBE spectrum sharing scheme 800 according to one or more aspects of the present disclosure.
  • the x-axis represents time in some constant units.
  • the y-axis represents frequency in some constant units.
  • the scheme 800 may be employed by the BSs 105 and the UEs 115.
  • the spectrum spans a frequency band 801 and is time-partitioned into a plurality of periods for spectrum sharing. Each period includes a contention period followed by a FFP.
  • a contention period a plurality of UEs including a UE A and a UE B may contend for the shared medium and perform an LBT.
  • an FFP is fixed or configurable by the network 100. In some aspects, the FFP is configured from the range of 1 ms to 10 ms.
  • the contention period and the FFP may have fixed durations and/or predetermined times.
  • each contention period may include one or more OFDM symbols, and each FFP may include one or more subframes, slots, or TTIs.
  • the FFP may be defined in units of slots (e.g., about 850 microseconds ( ⁇ s) long) .
  • the FFP structure may be pre-determined and known by all network operating entities sharing the shared spectrum. The network operating entities may be time-synchronized when operating in the shared spectrum.
  • a UE A and a UE B may perform a CAT2 LBT 802 in the frequency band 801 and contend for the shared medium during a contention period 803.
  • the UE A may perform CAT2 LBT 802 and acquire a COT based on the energy detection threshold 218, where a duration of the COT is for exclusive use by the UE A. Accordingly, the UE A does not share the COT with the BS.
  • the UE A reserves the COT in the frequency band 801 and communicates UL signals during an FFP 810.
  • the UE A transmits an UL communication signal 822 to a BS. Based on a failed CAT2 LBT 802, the UE B skips the FFP 810 and contends for the shared medium again after the FFP 810, but before the start of the FFP 812.
  • the UE A and the UE B may perform a CAT2 LBT 804 in the frequency band 801 and contend for the shared medium during a contention period 805.
  • the UE A may perform CAT2 LBT 804 and acquire a COT based on the energy detection threshold 238, where a duration of the COT is shared between the UE A and the BS. Accordingly, the UE A shares the COT with the BS.
  • the UE A reserves the COT in the frequency band 801 and communicates UL signals during an FFP 812.
  • the UE A transmits an UL communication signal 840 to the BS.
  • the BS may transmit a DL communication signal 842 during a portion of the COT.
  • the UE B skips the FFP 812 and contends for the medium again after the FFP 812, but before the start of the next FFP.
  • the UE and/or the BS may use the teachings provided in the disclosure, with aspects for example from FIGs. 1-7, 9, and 10, for signaling UL-to-DL COT sharing or receiving the COT sharing signaling.
  • the BS may assign the energy detection threshold for the UE to apply when performing LBT (e.g., CAT2 LBT) .
  • the UE determines the energy detection threshold and indicates the energy detection threshold used by the UE to the BS.
  • FIG. 9 is a flow diagram of a communication method 900 according to some aspects of the present disclosure.
  • Blocks of the method 900 can be executed by a computing device (e.g., a processor, processing circuit, and/or other suitable component) of a wireless communication device or other suitable means for executing the blocks.
  • a wireless communication device such as the UE 115, UE 215, UE 300, UE 515, UE 615, UE 715, and/or UE 815 may utilize one or more components, such as the processor 302, the memory 304, the COT sharing module 306, the transceiver 310, the modem 312, and the one or more antennas 316, to execute the blocks of method 900.
  • the method 900 may employ similar mechanisms as in the communication schemes 200, 500, 600, 700 and/or 800 described above with respect to FIGs. 2, 5, 6, 7 and 8, respectively. As illustrated, the method 900 includes a number of enumerated blocks, but aspects of the method 900 may include additional blocks before, after, and in between the enumerated blocks. In some aspects, one or more of the enumerated blocks may be omitted or performed in a different order.
  • the method 900 includes acquiring, by a UE, a first COT based on a first energy detection threshold, where a duration of the first COT is for exclusive use by the UE.
  • the first energy detection threshold may be based on a maximum transmit power of the UE, and the second energy detection threshold may be based on a maximum transmit power of the BS.
  • the method 900 includes acquiring, by the UE, a second COT based on a second energy detection threshold indicated by COT sharing information associated with the second COT, where the first energy detection threshold is different from the second energy detection threshold.
  • the UE may receive from the BS, a first UL scheduling grant indicating the first energy detection threshold and a second UL scheduling grant indicating the second energy detection threshold.
  • the UE may perform a first LBT based on the first energy detection threshold indicated by the first UL scheduling grant, where acquiring the first COT is based on an LBT pass of the first LBT.
  • the UE may perform a second LBT based on the second energy detection threshold indicated by the second UL scheduling grant, where acquiring the second COT is based on an LBT pass of the second LBT.
  • the first and second LBTs may be CAT4 LBTs or CAT2 LBTs.
  • the UE may identify a first bit included in the first UL scheduling grant and identify a second it included in the second UL scheduling grant, where the first bit indicates the first energy detection threshold and the second bit indicates the second energy detection threshold.
  • the UE may receive from the BS, first DCI indicating the first energy detection threshold and second DCI indicating the second energy detection threshold, where acquiring the first COT includes acquiring the first COT for using the configured UL resourceand acquiring the second COT includes acquiring the second COT for using the second configured UL resource.
  • the UE may perform a first LBT based on the first energy detection threshold indicated by the first DCI and may perform a second LBT based on the second energy detection threshold indicated by the second DCI.
  • the UE may identify a first bit included in the first DCI indicating the first energy detection threshold may identify a second bit included in the second DCI indicating the second energy detection threshold.
  • the first and second LBTs may be CAT4 LBTs or CAT2 LBTs.
  • the UE may select one of the first energy detection threshold or the second energy detection threshold for acquisition of the second COT and may transmit an indication of the selected first or second energy detection threshold to the BS.
  • the UE may perform a first LBT for acquiring the second COT based on the first energy detection threshold and may perform a second LBT for acquiring the second COT based on the second energy detection threshold.
  • the UE may determine whether the first LBT or the second LBT results in an LBT pass at transmission time for acquiring the second COT, may select the first energy detection threshold for acquiring the second COT in response to a determination that the first LBT results in an LBT pass at the transmission time and in response to a determination that the second LBT does not result in an LBT pass, and may select the second energy detection threshold for acquiring the second COT in response to a determination that the second LBT results in an LBT pass at the transmission time.
  • the UE may transmit to the BS during the second COT, an UL communication including a bit indicating the second energy detection threshold for use by the BS in transmitting the DL communication signal during the first portion of the second COT.
  • the UE may transmit the UL communication by transmitting CG-UCI including the bit.
  • the UE may communicate a first CG-UCI with a first masking sequence of CRC indicating the first energy detection threshold and may communicate a second CG-UCI with a second masking sequence of CRC indicating the second energy detection threshold.
  • the UE may communicate a first DMRS signal with a first scrambling sequence indicating the first energy detection threshold and may communicate a second DMRS signal with a second scrambling sequence indicating the second energy detection threshold.
  • the UE may determine whether to share the first COT with the BS.
  • the UE may select the first energy detection threshold in response to a determination to not share the first COT with the BS and may select the second energy detection threshold in response to a determination to share the first COT with the BS.
  • the UE may perform a first LBT for acquiring the first COT based on the selected energy detection threshold and may transmit an UL communication signal indicating the selected energy detection threshold to the BS.
  • the UE may transmit to the BS during the second COT, the COT sharing information including a duration of the second COT for COT sharing with the BS. Additionally, the UE may transmit to the BS, an UL communication signal during a second portion of the second COT based on the COT sharing information.
  • the method 900 includes receiving, by the UE from a BS, a DL communication signal during a first portion of the second COT based on the COT sharing information.
  • FIG. 10 is a flow diagram of a communication method 1000 according to some aspects of the present disclosure.
  • Blocks of the method 1000 can be executed by a computing device (e.g., a processor, processing circuit, and/or other suitable component) of a wireless communication device or other suitable means for executing the blocks.
  • a wireless communication device such as the BS 105, BS 205, BS 400, BS 505, BS 605, BS 705 and/or BS 805 may utilize one or more components, such as the processor 402, the memory 404, the COT sharing module 408, the transceiver 410, the modem 412, and the one or more antennas 416, to execute the blocks of method 1000.
  • the method 1000 may employ similar mechanisms as in the communication schemes 200, 500, 600, 700 and/or 800 described above with respect to FIGs. 2, 5, 6, 7 and 8, respectively. As illustrated, the method 1000 includes a number of enumerated blocks, but aspects of the method 1000 may include additional blocks before, after, and in between the enumerated blocks. In some aspects, one or more of the enumerated blocks may be omitted or performed in a different order.
  • the method 1000 includes receiving, by a BS from a UE, an UL communication signal during a first UE-acquired COT based on a first energy detection threshold, where a duration of the first COT is for exclusive use by the UE.
  • the BS may utilize one or more components, such as the processor 402, the memory 404, the COT sharing module 408, the transceiver 410, the modem 412, and the one or more antennas 416, to receive an UL communication signal during a first UE-acquired COT based on a first energy detection threshold, where a duration of the first COT is for exclusive use by the UE.
  • the UE does not share the first COT with the BS. Additionally, the UE may acquire a COT based on a first energy detection threshold if the UE performs LBT using the first energy detection threshold and the LBT results in an LBT pass. Additionally, the BS may receive the UL communication signal based on, for example, an UL scheduling grant or a CG-UL.
  • the method 1000 includes acquiring, by the BS, a duration of a second UE-acquired COT based on a second energy detection threshold indicated by COT sharing information associated with the second UE-acquired COT, where the first energy detection threshold is different from the second energy detection threshold.
  • the BS may utilize one or more components, such as the processor 402, the memory 404, the COT sharing module 408, the transceiver 410, the modem 412, and the one or more antennas 416, to acquire a duration of a second UE-acquired COT based on a second energy detection threshold indicated by COT sharing information associated with the second UE-acquired COT, where the first energy detection threshold is different from the second energy detection threshold.
  • the first energy detection threshold may be based on a maximum transmit power of the UE, and the second energy detection threshold may be based on a maximum transmit power of the BS.
  • the BS transmits COT sharing information to the UE.
  • the BS may transmit a first UL scheduling grant indicating to the UE to use the first energy detection threshold in acquiring the first UE-acquired COT and may transmit a second UL scheduling grant indicating to the UE to use the second energy detection threshold in acquiring the second UE-acquired COT.
  • the first UL scheduling grant may include a first bit indicating the first energy detection threshold
  • the second UL scheduling grant may include a second bit indicating the second energy detection threshold.
  • the BS may configure the UE with a first CG-UL resource and a second CG-UL resource.
  • the BS may transmit to the UE, first DCI indicating the first energy detection threshold and second DCI indicating the second energy detection threshold.
  • the BS may receive from the UE during the first UE-acquired COT, a first UL communication signal using the first CG-UL resource.
  • the BS may receive from the UE during the second UE-acquired COT, a second UL communication signal using the second CG-UL resource.
  • the first DCI may include a first bit indicating the first energy detection threshold
  • the second DCI may include a second bit indicating the second energy detection threshold.
  • the BS receives COT sharing information from the UE.
  • the COT sharing information may include for example one of the first energy detection threshold or the second energy detection threshold for use by the UE in acquisition of a COT, a duration of the COT that the UE will share with the BS, etc.
  • the BS may determine whether the UE will share the COT with the BS and/or a duration of the COT sharing.
  • the BS may receive from the UE, a first CG-UCI with a first masking sequence of CRC indicating the first energy detection threshold and a second CG-UCI with a second masking sequence of CRC indicating the second energy detection threshold.
  • the BS may determine, based on the given masking sequence, the energy detection threshold used by the UE in acquiring the COT.
  • the BS may receive from the UE, a first DMRS signal with a first scrambling sequence indicating the first energy detection threshold and a second DMRS signal with a second scrambling sequence indicating the second energy detection threshold.
  • the BS may determine, based on the given scrambling sequence, the energy detection threshold used by the UE in acquiring the COT.
  • the method 1000 includes transmitting, by the BS to the UE, a DL communication signal during the duration of the second UE-acquired COT.
  • the BS may utilize one or more components, such as the processor 402, the memory 404, the COT sharing module 408, the transceiver 410, the modem 412, and the one or more antennas 416, to transmit a DL communication signal during the duration of the second UE-acquired COT.
  • the BS may determine, based on the COT sharing information, that the UE will share the second UE-acquired COT with the BS and/or the duration in which the UE will share the second UE-acquired COT.
  • Information and signals may be represented using any of a variety of different technologies and techniques.
  • data, instructions, commands, information, signals, bits, symbols, and chips that may be referenced throughout the above description may be representedby voltages, currents, electromagnetic waves, magnetic fields or particles, optical fields or particles, or any combination thereof.
  • 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, multiple microprocessors, one or more microprocessors in conjunction with a DSP core, or any other such configuration) .
  • the functions described herein may be implemented in hardware, software executed by a processor, firmware, or any combination thereof. If implemented in software executed by a processor, the functions may be stored on or transmitted over as one or more instructions or code on a computer-readable medium. Other examples and implementations are within the scope of the disclosure and appended claims. For example, due to the nature of software, functions described above can be implemented using software executed by a processor, hardware, firmware, hardwiring, or combinations of any of these. Features implementing functions may also be physically located at various positions, including being distributed such that portions of functions are implemented at different physical locations.
  • “or” as used in a list of items indicates an inclusive list such that, for example, a list of [at least one of A, B, or C] means A or B or C or AB or AC or BC or ABC (i.e., A and B and C) .

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

Abstract

L'invention se rapporte aux communications sans fil dans un système, et concerne des systèmes et des procédés de communications sans fil. Un équipement utilisateur (UE) peut acquérir un premier temps d'occupation de canal (COT) en fonction d'un premier seuil de détection d'énergie, une durée du premier COT étant destinée à être exclusivement utilisée par l'UE. L'UE peut acquérir un second COT en fonction d'un second seuil de détection d'énergie indiqué par des informations de partage de COT associées au second COT. Le premier seuil de détection d'énergie est différent du second seuil de détection d'énergie. L'UE peut recevoir, d'une station de base (BTS), un signal de communication de liaison descendante (DL) pendant une première partie du second COT en fonction des informations de partage de COT.
PCT/CN2019/116684 2019-11-08 2019-11-08 Indicateur de seuil de détection d'énergie servant au partage de temps d'occupation de canal (cot) Ceased WO2021087971A1 (fr)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2022252196A1 (fr) * 2021-06-03 2022-12-08 Nokia Shanghai Bell Co., Ltd. Partage de temps d'occupation de canal pour transmission dans une bande sans licence

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20170238249A1 (en) * 2016-02-12 2017-08-17 Samsung Electronics Co., Ltd. Control information utilization method and apparatus of terminal in mobile communication system
US20180027554A1 (en) * 2016-07-21 2018-01-25 Qualcomm Incorporated Techniques for communicating on an uplink in a shared radio frequency spectrum band
WO2019038701A1 (fr) * 2017-08-22 2019-02-28 Telefonaktiebolaget Lm Ericsson (Publ) Contrôle de transmissions en liaison montante autonome lors d'une coexistence avec des équipements utilisateurs programmés
US20190208540A1 (en) * 2017-08-04 2019-07-04 Lg Electronics Inc. Method of transmitting uplink signal from user equipment in a wireless communication system supporting unlicensed band and apparatus supporting the same

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20170238249A1 (en) * 2016-02-12 2017-08-17 Samsung Electronics Co., Ltd. Control information utilization method and apparatus of terminal in mobile communication system
US20180027554A1 (en) * 2016-07-21 2018-01-25 Qualcomm Incorporated Techniques for communicating on an uplink in a shared radio frequency spectrum band
US20190208540A1 (en) * 2017-08-04 2019-07-04 Lg Electronics Inc. Method of transmitting uplink signal from user equipment in a wireless communication system supporting unlicensed band and apparatus supporting the same
WO2019038701A1 (fr) * 2017-08-22 2019-02-28 Telefonaktiebolaget Lm Ericsson (Publ) Contrôle de transmissions en liaison montante autonome lors d'une coexistence avec des équipements utilisateurs programmés

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
QUALCOMM INCORPORATED: "Channel access procedures for NR unlicensed", 3GPP DRAFT; R1-1907261 7.2.2.2.1 CHANNEL ACCESS PROCEDURES FOR NR UNLICENSED, 3RD GENERATION PARTNERSHIP PROJECT (3GPP), MOBILE COMPETENCE CENTRE ; 650, ROUTE DES LUCIOLES ; F-06921 SOPHIA-ANTIPOLIS CEDEX ; FRANCE, vol. RAN WG1, no. Reno, US; 20190513 - 20190517, 4 May 2019 (2019-05-04), Mobile Competence Centre ; 650, route des Lucioles ; F-06921 Sophia-Antipolis Cedex ; France, XP051709284 *

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2022252196A1 (fr) * 2021-06-03 2022-12-08 Nokia Shanghai Bell Co., Ltd. Partage de temps d'occupation de canal pour transmission dans une bande sans licence

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