WO2021253142A1 - Configuration de signal de référence de sondage (srs) de groupe en duplex intégral - Google Patents

Configuration de signal de référence de sondage (srs) de groupe en duplex intégral Download PDF

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Publication number
WO2021253142A1
WO2021253142A1 PCT/CN2020/096022 CN2020096022W WO2021253142A1 WO 2021253142 A1 WO2021253142 A1 WO 2021253142A1 CN 2020096022 W CN2020096022 W CN 2020096022W WO 2021253142 A1 WO2021253142 A1 WO 2021253142A1
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Prior art keywords
srs
group
wireless communication
communication device
devices
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PCT/CN2020/096022
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English (en)
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Min Huang
Yu Zhang
Hao Xu
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Qualcomm Incorporated
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Priority to PCT/CN2020/096022 priority Critical patent/WO2021253142A1/fr
Publication of WO2021253142A1 publication Critical patent/WO2021253142A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/14—Two-way operation using the same type of signal, i.e. duplex
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0048—Allocation of pilot signals, i.e. of signals known to the receiver
    • H04L5/0051—Allocation of pilot signals, i.e. of signals known to the receiver of dedicated pilots, i.e. pilots destined for a single user or terminal

Definitions

  • aspects of the present disclosure relate to wireless communications, and more particularly, to techniques for group configuration of sounding reference signals (SRSs) for wireless communications devices to measure device-to-device interference.
  • SRSs sounding reference signals
  • Wireless communication systems are widely deployed to provide various telecommunication services such as telephony, video, data, messaging, broadcasts, etc. These wireless communication systems may employ multiple-access technologies capable of supporting communication with multiple users by sharing available system resources (e.g., bandwidth, transmit power, etc. ) .
  • available system resources e.g., bandwidth, transmit power, etc.
  • multiple-access systems examples include 3rd Generation Partnership Project (3GPP) Long Term Evolution (LTE) systems, LTE Advanced (LTE-A) systems, code division multiple access (CDMA) systems, time division multiple access (TDMA) systems, frequency division multiple access (FDMA) systems, orthogonal frequency division multiple access (OFDMA) systems, single-carrier frequency division multiple access (SC-FDMA) systems, and time division synchronous code division multiple access (TD-SCDMA) systems, to name a few.
  • 3GPP 3rd Generation Partnership Project
  • LTE Long Term Evolution
  • LTE-A LTE Advanced
  • CDMA code division multiple access
  • TDMA time division multiple access
  • FDMA frequency division multiple access
  • OFDMA orthogonal frequency division multiple access
  • SC-FDMA single-carrier frequency division multiple access
  • TD-SCDMA time division synchronous code division multiple access
  • a wireless multiple-access communication system may include a number of base stations (BSs) , which are each capable of simultaneously supporting communication for multiple communication devices, otherwise known as user equipments (UEs) .
  • BSs base stations
  • UEs user equipments
  • a set of one or more base stations may define an eNodeB (eNB) .
  • eNB eNodeB
  • a wireless multiple access communication system may include a number of distributed units (DUs) (e.g., edge units (EUs) , edge nodes (ENs) , radio heads (RHs) , smart radio heads (SRHs) , transmission reception points (TRPs) , etc.
  • DUs distributed units
  • EUs edge units
  • ENs edge nodes
  • RHs radio heads
  • SSRHs smart radio heads
  • TRPs transmission reception points
  • CUs central units
  • CNs central nodes
  • ANCs access node controllers
  • a BS or DU may communicate with a set of UEs on downlink channels (e.g., for transmissions from a BS or DU to a UE) and uplink channels (e.g., for transmissions from a UE to a BS or DU) .
  • New radio e.g., 5G NR
  • 5G NR is an example of an emerging telecommunication standard.
  • NR is a set of enhancements to the LTE mobile standard promulgated by 3GPP.
  • NR is designed to better support mobile broadband Internet access by improving spectral efficiency, lowering costs, improving services, making use of new spectrum, and better integrating with other open standards using OFDMA with a cyclic prefix (CP) on the downlink (DL) and on the uplink (UL) .
  • CP cyclic prefix
  • NR supports beamforming, multiple-input multiple-output (MIMO) antenna technology, and carrier aggregation.
  • MIMO multiple-input multiple-output
  • Certain aspects provide a method for wireless communication that may be performed by a wireless communication device.
  • the method generally includes receiving, from a network entity, a group sounding reference signal (SRS) configuration for a group of devices including the wireless communication device, and taking one or more actions based on an action indicator for the wireless communication device included in the group SRS configuration.
  • SRS group sounding reference signal
  • Certain aspects provide a method for wireless communication that may be performed by a network entity.
  • the method generally includes transmitting, to a group of devices, a group sounding reference signal (SRS) configuration for the group of devices, and receiving, from at least one wireless communication device in the group of devices, a measurement based on an action indicator included in the group SRS configuration for the at least one wireless communication device.
  • SRS group sounding reference signal
  • aspects of the present disclosure provide means for, apparatus, processors, and computer-readable mediums for performing the methods described herein.
  • the one or more aspects comprise the features hereinafter fully described and particularly pointed out in the claims.
  • the following description and the appended drawings set forth in detail certain illustrative features of the one or more aspects. These features are indicative, however, of but a few of the various ways in which the principles of various aspects may be employed.
  • FIG. 1 is a block diagram conceptually illustrating an example telecommunications system, in accordance with certain aspects of the present disclosure.
  • FIG. 2 is a block diagram illustrating an example architecture of a distributed radio access network (RAN) , in accordance with certain aspects of the present disclosure.
  • RAN radio access network
  • FIG. 3 shows an exemplary system model of a Uu interface interaction in a cell using a full-duplex technique, in accordance with certain aspects of the present disclosure.
  • FIGs. 4A &4B show an exemplary system model of a full-duplex wireless communications system using an integrated access and backhaul (IAB) node, in accordance with certain aspects of the present disclosure.
  • IAB integrated access and backhaul
  • FIGs. 5A &5B show an exemplary system model of a full-duplex wireless communications system using an integrated access and backhaul (IAB) node, in accordance with certain aspects of the present disclosure.
  • IAB integrated access and backhaul
  • FIG. 6 is a flow diagram illustrating example operations for wireless communication by a wireless communication device, in accordance with certain aspects of the present disclosure.
  • FIG. 7 is a flow diagram illustrating example operations for wireless communication by a network entity, in accordance with certain aspects of the present disclosure.
  • FIG. 8 illustrates a communications device that may include various components configured to perform operations for the techniques disclosed herein in accordance with aspects of the present disclosure.
  • FIG. 9 illustrates a communications device that may include various components configured to perform operations for the techniques disclosed herein in accordance with aspects of the present disclosure.
  • aspects of the present disclosure provide apparatus, methods, processing systems, and computer readable mediums for group configuration of sounding reference signals (SRSs) for wireless communications devices to measure device-to-device interference.
  • SRSs sounding reference signals
  • Wireless full-duplex (FD) communications is an emerging technique and is theoretically capable of doubling the link capacity when compared with half-duplex communications.
  • the main idea of wireless full-duplex communications is to enable radio network nodes to transmit and receive simultaneously on the same frequency band in the same time slot. This contrasts with conventional half-duplex operation, where transmission and reception either differ in time or in frequency.
  • a full-duplex network node such as a base station in a cellular network, can communicate simultaneously in uplink (UL) and downlink (DL) with two half-duplex terminals (i.e., user equipments (UEs) ) using the same radio resources.
  • UL uplink
  • DL downlink
  • UEs user equipments
  • a relay node in a wireless full-duplex application can communicate simultaneously with an anchor node and a mobile terminal (e.g., transmitting to the anchor node while receiving from the mobile terminal) in a one-hop scenario, or with two other relay nodes in a multi-hop scenario.
  • a UE receiving a downlink (DL) transmission and a UE transmitting an uplink (UL) transmission employ the same time-frequency resource in a full-duplex wireless communication system, if these two UEs are located a short distance from each other, the UL transmission signal may cause serious co-channel interference to the DL signal reception.
  • a backhaul link and an access link may employ the same time-frequency resource in a full-duplex wireless communication system, and thus if two nodes are located a short distance from each other, communications via the backhaul link and the access link may cause serious co-channel interference with each other.
  • LTE Long Term Evolution
  • LTE-A LTE-Advanced
  • CDMA code division multiple access
  • TDMA time division multiple access
  • FDMA frequency division multiple access
  • OFDMA orthogonal frequency division multiple access
  • SC-FDMA single-carrier frequency division multiple access
  • TD-SCDMA time division synchronous code division multiple access
  • network and “system” are often used interchangeably.
  • a CDMA network may implement a radio technology such as Universal Terrestrial Radio Access (UTRA) , cdma2000, etc.
  • UTRA includes Wideband CDMA (WCDMA) and other variants of CDMA.
  • cdma2000 covers IS-2000, IS-95 and IS-856 standards.
  • a TDMA network may implement a radio technology such as Global System for Mobile Communications (GSM) .
  • GSM Global System for Mobile Communications
  • An OFDMA network may implement a radio technology such as NR (e.g. 5G RA) , Evolved UTRA (E-UTRA) , Ultra Mobile Broadband (UMB) , IEEE 802.11 (Wi-Fi) , IEEE 802.16 (WiMAX) , IEEE 802.20, Flash-OFDMA, etc.
  • NR e.g. 5G RA
  • E-UTRA Evolved UTRA
  • UMB Ultra Mobile Broadband
  • IEEE 802.11 Wi-Fi
  • IEEE 802.16 WiMAX
  • UTRA and E-UTRA are part of Universal Mobile Telecommunication System (UMTS) .
  • UTRA, E-UTRA, UMTS, LTE, LTE-Aand GSM are described in documents from an organization named “3rd Generation Partnership Project” (3GPP) .
  • cdma2000 and UMB are described in documents from an organization named “3rd Generation Partnership Project 2” (3GPP2) .
  • New Radio is an emerging wireless communications technology under development in conjunction with the 5G Technology Forum (5GTF) .
  • NR access e.g., 5G NR
  • 5G NR may support various wireless communication services, such as enhanced mobile broadband (eMBB) targeting wide bandwidth (e.g., 80 MHz or beyond) , millimeter wave (mmW) targeting high carrier frequency (e.g., 25 GHz or beyond) , massive machine type communications MTC (mMTC) targeting non-backward compatible MTC techniques, and/or mission critical targeting ultra-reliable low-latency communications (URLLC) .
  • eMBB enhanced mobile broadband
  • mmW millimeter wave
  • mMTC massive machine type communications MTC
  • URLLC ultra-reliable low-latency communications
  • These services may include latency and reliability requirements.
  • TTI transmission time intervals
  • QoS quality of service
  • these services may co-exist in the same subframe.
  • FIG. 1 illustrates an example wireless communication network 100 in which aspects of the present disclosure may be performed.
  • the wireless communication network 100 may be a full-duplex NR system (e.g., a full-duplex 5G network) .
  • the UE 120a has a group sounding reference signal (SRS) configuration module that may be configured to measure sounding reference signals (SRS) based on a group SRS configuration, according to aspects described herein.
  • the BS 110a has a group SRS configuration module that may be configured to configure SRS for a group of wireless communication devices, according to aspects described herein.
  • SRS group sounding reference signal
  • the wireless communication network 100 may include a number of base stations (BSs) 110 and other network entities.
  • a BS may be a station that communicates with user equipments (UEs) .
  • Each BS 110 may provide communication coverage for a particular geographic area.
  • the term “cell” can refer to a coverage area of a Node B (NB) and/or a NB subsystem serving this coverage area, depending on the context in which the term is used.
  • NB Node B
  • AP access point
  • DU distributed unit
  • carrier or transmission reception point
  • a cell may not necessarily be stationary, and the geographic area of the cell may move according to the location of a mobile BS.
  • the BSs may be interconnected to one another and/or to one or more other BSs or network nodes (not shown) in wireless communication network 100 through various types of backhaul interfaces, such as a direct physical connection, a wireless connection, a virtual network, or the like using any suitable transport network.
  • any number of wireless networks may be deployed in a given geographic area.
  • Each wireless network may support a particular radio access technology (RAT) and may operate on one or more frequencies.
  • a RAT may also be referred to as a radio technology, an air interface, etc.
  • a frequency may also be referred to as a carrier, a subcarrier, a frequency channel, a tone, a subband, etc.
  • Each frequency may support a single RAT in a given geographic area in order to avoid interference between wireless networks of different RATs.
  • NR or 5G RAT networks may be deployed.
  • a BS may provide communication coverage for a macro cell, a pico cell, a femto cell, and/or other types of cells.
  • a macro cell may cover a relatively large geographic area (e.g., several kilometers in radius) and may allow unrestricted access by UEs with service subscription.
  • a pico cell may cover a relatively small geographic area and may allow unrestricted access by UEs with service subscription.
  • a femto cell may cover a relatively small geographic area (e.g., a home) and may allow 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, etc. ) .
  • CSG Closed Subscriber Group
  • a BS for a macro cell may be referred to as a macro BS.
  • a BS for a pico cell may be referred to as a pico BS.
  • a BS for a femto cell may be referred to as a femto BS or a home BS.
  • the BSs 110a, 110b and 110c may be macro BSs for the macro cells 102a, 102b and 102c, respectively.
  • the BS 110x may be a pico BS for a pico cell 102x.
  • the BSs 110y and 110z may be femto BSs for the femto cells 102y and 102z, respectively.
  • a BS may support one or multiple (e.g., three) cells.
  • Wireless communication network 100 may also include relay stations.
  • a relay station is a station that receives a transmission of data and/or other information from an upstream station (e.g., a BS or a UE) and sends a transmission of the data and/or other information to a downstream station (e.g., a UE or a BS) .
  • a relay station may also be a UE that relays transmissions for other UEs.
  • a relay station 110r may communicate with the BS 110a and a UE 120r in order to facilitate communication between the BS 110a and the UE 120r.
  • a relay station may also be referred to as a relay BS, a relay, etc.
  • Wireless communication network 100 may be a heterogeneous network that includes BSs of different types, e.g., macro BS, pico BS, femto BS, relays, etc. These different types of BSs may have different transmit power levels, different coverage areas, and different impact on interference in the wireless communication network 100.
  • macro BS may have a high transmit power level (e.g., 20 Watts) whereas pico BS, femto BS, and relays may have a lower transmit power level (e.g., 1 Watt) .
  • Wireless communication 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 techniques described herein may be used for both synchronous and asynchronous operation.
  • a network controller 130 may couple to a set of BSs and provide coordination and control for these BSs.
  • the network controller 130 may communicate with the BSs 110 via a backhaul.
  • the BSs 110 may also communicate with one another (e.g., directly or indirectly) via wireless or wireline backhaul.
  • the UEs 120 may be dispersed throughout the wireless communication network 100, and each UE may be stationary or mobile.
  • a UE may also be referred to as a mobile station, a terminal, an access terminal, a subscriber unit, a station, a Customer Premises Equipment (CPE) , a cellular phone, a smart phone, a personal digital assistant (PDA) , a wireless modem, a wireless communication device, a handheld device, a laptop computer, a cordless phone, a wireless local loop (WLL) station, a tablet computer, a camera, a gaming device, a netbook, a smartbook, an ultrabook, an appliance, a medical device or medical equipment, a biometric sensor/device, a wearable device such as a smart watch, smart clothing, smart glasses, a smart wrist band, smart jewelry (e.g., a smart ring, a smart bracelet, etc.
  • CPE Customer Premises Equipment
  • PDA personal digital assistant
  • WLL wireless local loop
  • MTC machine-type communication
  • eMTC evolved MTC
  • MTC and eMTC UEs include, for example, robots, drones, remote devices, sensors, meters, monitors, location tags, etc., that may communicate with a BS, another device (e.g., remote device) , or some other entity.
  • a wireless node may provide, for example, connectivity for or to a network (e.g., a wide area network such as Internet or a cellular network) via a wired or wireless communication link.
  • a network e.g., a wide area network such as Internet or a cellular network
  • Some UEs may be considered Internet-of-Things (IoT) devices, which may be narrowband IoT (NB-IoT) devices.
  • IoT Internet-of-Things
  • NB-IoT narrowband IoT
  • Certain wireless networks utilize orthogonal frequency division multiplexing (OFDM) on the downlink and single-carrier frequency division multiplexing (SC-FDM) on the uplink.
  • OFDM and SC-FDM partition the system bandwidth into multiple (K) orthogonal subcarriers, which are also commonly referred to as tones, bins, etc.
  • K orthogonal subcarriers
  • Each subcarrier may be modulated with data.
  • modulation symbols are sent in the frequency domain with OFDM and in the time domain with SC-FDM.
  • the spacing between adjacent subcarriers may be fixed, and the total number of subcarriers (K) may be dependent on the system bandwidth.
  • the spacing of the subcarriers may be 15 kHz and the minimum resource allocation (called a “resource block” (RB) ) may be 12 subcarriers (or 180 kHz) . Consequently, the nominal Fast Fourier Transfer (FFT) size may be equal to 128, 256, 512, 1024 or 2048 for system bandwidth of 1.25, 2.5, 5, 10, or 20 megahertz (MHz) , respectively.
  • the system bandwidth may also be partitioned into subbands. For example, a subband may cover 1.08 MHz (e.g., 6 RBs) , and there may be 1, 2, 4, 8, or 16 subbands for system bandwidth of 1.25, 2.5, 5, 10 or 20 MHz, respectively.
  • the basic transmission time interval (TTI) or packet duration is the 1 ms subframe.
  • a subframe is still 1 ms, but the basic TTI is referred to as a slot.
  • a subframe contains a variable number of slots (e.g., 1, 2, 4, 8, 16, ...slots) depending on the subcarrier spacing.
  • the NR RB is 12 consecutive frequency subcarriers.
  • NR may support a base subcarrier spacing of 15 KHz and other subcarrier spacing may be defined with respect to the base subcarrier spacing, for example, 30 kHz, 60 kHz, 120 kHz, 240 kHz, etc.
  • the symbol and slot lengths scale with the subcarrier spacing.
  • the CP length also depends on the subcarrier spacing.
  • NR may utilize OFDM with a CP on the uplink and downlink and include support for half-duplex operation using TDD. Beamforming may be supported and beam direction may be dynamically configured. MIMO transmissions with precoding may also be supported. In some examples, MIMO configurations in the DL may support up to 8 transmit antennas with multi-layer DL transmissions up to 8 streams and up to 2 streams per UE. In some examples, multi-layer transmissions with up to 2 streams per UE may be supported. Aggregation of multiple cells may be supported with up to 8 serving cells.
  • a scheduling entity (e.g., a BS) allocates resources for communication among some or all devices and equipment within its service area or cell.
  • the scheduling entity may be responsible for scheduling, assigning, reconfiguring, and releasing resources for one or more subordinate entities. That is, for scheduled communication, subordinate entities utilize resources allocated by the scheduling entity.
  • Base stations are not the only entities that may function as a scheduling entity.
  • a UE may function as a scheduling entity and may schedule resources for one or more subordinate entities (e.g., one or more other UEs) , and the other UEs may utilize the resources scheduled by the UE for wireless communication.
  • a UE may function as a scheduling entity in a peer-to-peer (P2P) network, and/or in a mesh network.
  • P2P peer-to-peer
  • UEs may communicate directly with one another in addition to communicating with a scheduling entity.
  • two or more subordinate entities may communicate with each other using sidelink signals.
  • Real-world applications of such sidelink communications may include public safety, proximity services, UE-to-network relaying, vehicle-to-vehicle (V2V) communications, Internet of Everything (IoE) communications, IoT communications, mission-critical mesh, and/or various other suitable applications.
  • a sidelink signal may refer to a signal communicated from one subordinate entity (e.g., UE1) to another subordinate entity (e.g., UE2) without relaying that communication through the scheduling entity (e.g., UE or BS) , even though the scheduling entity may be utilized for scheduling and/or control purposes.
  • the sidelink signals may be communicated using a licensed spectrum (unlike wireless local area networks, which typically use an unlicensed spectrum) .
  • a solid line with double arrows indicates desired transmissions between a UE and a serving BS, which is a BS designated to serve the UE on the downlink and/or uplink.
  • a finely dashed line with double arrows indicates potentially interfering transmissions between a UE and a BS.
  • FIG. 2 illustrates example components of BS 110 and UE 120 (e.g., in the wireless communication network 100 of FIG. 1) , which may be used to implement aspects of the present disclosure.
  • antennas 252, processors 266, 258, 264, and/or controller/processor 280 of the UE 120 and/or antennas 234, processors 220, 230, 238, and/or controller/processor 240 of the BS 110 may be used to perform the various techniques and methods described herein.
  • the controller/processor 240 of the BS 110 has a group SRS configuration module that may be to measure sounding reference signals (SRS) based on a group SRS configuration, according to aspects described herein.
  • the controller/processor 280 of the UE 120 has a group SRS configuration module that may be configured to configure SRS for a group of wireless communication devices, according to aspects described herein.
  • a transmit processor 220 may receive data from a data source 212 and control information from a controller/processor 240.
  • the control information may be for the physical broadcast channel (PBCH) , physical control format indicator channel (PCFICH) , physical hybrid ARQ indicator channel (PHICH) , physical downlink control channel (PDCCH) , group common PDCCH (GC PDCCH) , etc.
  • the data may be for the physical downlink shared channel (PDSCH) , etc.
  • the processor 220 may process (e.g., encode and symbol map) the data and control information to obtain data symbols and control symbols, respectively.
  • the transmit processor 220 may also generate reference symbols, such as for the primary synchronization signal (PSS) , secondary synchronization signal (SSS) , and cell-specific reference signal (CRS) .
  • a transmit (TX) multiple-input multiple-output (MIMO) processor 230 may perform spatial processing (e.g., precoding) on the data symbols, the control symbols, and/or the reference symbols, if applicable, and may provide output symbol streams to the modulators (MODs) 232a-232t. Each modulator 232 may process a respective output symbol stream (e.g., for OFDM, etc. ) to obtain an output sample stream.
  • Each modulator may further process (e.g., convert to analog, amplify, filter, and upconvert) the output sample stream to obtain a downlink signal.
  • Downlink signals from modulators 232a-232t may be transmitted via the antennas 234a-234t, respectively.
  • the antennas 252a-252r may receive the downlink signals from the BS 110 and may provide received signals to the demodulators (DEMODs) in transceivers 254a-254r, respectively.
  • Each demodulator 254 may condition (e.g., filter, amplify, downconvert, and digitize) a respective received signal to obtain input samples.
  • Each demodulator may further process the input samples (e.g., for OFDM, etc. ) to obtain received symbols.
  • a MIMO detector 256 may obtain received symbols from all the demodulators 254a-254r, perform MIMO detection on the received symbols if applicable, and provide detected symbols.
  • a receive processor 258 may process (e.g., demodulate, deinterleave, and decode) the detected symbols, provide decoded data for the UE 120 to a data sink 260, and provide decoded control information to a controller/processor 280.
  • a transmit processor 264 may receive and process data (e.g., for the physical uplink shared channel (PUSCH) ) from a data source 262 and control information (e.g., for the physical uplink control channel (PUCCH) from the controller/processor 280.
  • the transmit processor 264 may also generate reference symbols for a reference signal (e.g., for the sounding reference signal (SRS) ) .
  • the symbols from the transmit processor 264 may be precoded by a TX MIMO processor 266 if applicable, further processed by the demodulators in transceivers 254a-254r (e.g., for SC-FDM, etc. ) , and transmitted to the base station 110.
  • the uplink signals from the UE 120 may be received by the antennas 234, processed by the modulators 232, detected by a MIMO detector 236 if applicable, and further processed by a receive processor 238 to obtain decoded data and control information sent by the UE 120.
  • the receive processor 238 may provide the decoded data to a data sink 239 and the decoded control information to the controller/processor 240.
  • the controllers/processors 240 and 280 may direct the operation at the BS 110 and the UE 120, respectively.
  • the controller/processor 240 and/or other processors and modules at the BS 110 may perform or direct the execution of processes for the techniques described herein.
  • the memories 242 and 282 may store data and program codes for BS 110 and UE 120, respectively.
  • a scheduler 244 may schedule UEs for data transmission on the downlink and/or uplink.
  • FIG. 3 shows an exemplary system model 300 of a Uu interface interaction in a cell using a full-duplex technique, according to aspects of the present disclosure.
  • full-duplex technique downlink transmissions and uplink transmissions can coexist in the same radio spectrum (i.e., the same frequency band) simultaneously in a Uu interface of a cell.
  • UE 306 (which may be an example of a UE 120, shown in FIG. 1) transmits a signal 310 to base station 302 (which may be an example of BS 110a, shown in FIG. 1) with transmit power P tx dB.
  • UE 304 receives a signal 312 from the base station with receive power P rx dB.
  • the UE 304 measures the channel (i.e., the interference-plus-noise power spectrum) from the base station, determines CSI, and sends an aperiodic (i.e., in response to a command from the base station) or a periodic CSI report 320 to the base station.
  • the base station transmits a downlink signal 312 according to a transport format determined by the base station based on the CSI 320 reported to the base station by the UE 304.
  • the UE-to-UE interference (i.e., from the UL transmission to the DL transmission) 330 is P tx -D dB. If the UE-to-UE interference power spectrum is larger than the original interference-plus-noise power spectrum at UE 304, then the UE-to-UE interference may impair the reception performance of the UE 304 in receiving the downlink signal 312.
  • a UE that generates UE-to-UE interference by sending an UL transmission is referred to as an aggressor UE (e.g., UE 306)
  • a UE that suffers from UE-to-UE interference is referred to as a victim UE (e.g., UE 304) .
  • FIGs. 4A &4B show an exemplary system model 400 of a full-duplex wireless communications system using an integrated access and backhaul (IAB) node 404, according to aspects of the present disclosure.
  • An IAB node 404 (which may be an example of BS 110a, shown in FIG. 1) can be regarded as a relay node through which data can be transmitted from an IAB donor 402 (which may be an example of a BS 110, shown in FIG. 1) to a UE 406 (which may be an example of UE 120a, shown in FIG. 1) or a child IAB node 408 (which may be an example of a BS 110, shown in FIG. 1) , as in FIG.
  • IAB donor 402 which may be an example of a BS 110, shown in FIG. 1
  • UE 406 which may be an example of UE 120a, shown in FIG. 1
  • a child IAB node 408 (which may be an example of a BS 110, shown in FIG. 1) , as
  • the IAB node 404 can receive first data from an IAB donor 402 via a downlink portion of a backhaul link 410 using a set of time-frequency radio resources and transmit the first data to the UE 406 or child IAB node 408 via a downlink portion of an access link 420 using the same set of time-frequency radio resources, as shown in FIG. 4A.
  • the IAB node 404 can receive second data from the UE 406 or child IAB node 408 via an uplink portion of the access link 420 using the set of time-frequency radio resources and transmit the second data to the IAB donor 402 via an uplink portion of the backhaul link 410 while using the same time-frequency radio resources, as shown in FIG. 4B.
  • the interference 430 from backhaul link 410 to access link 420 may cause a data reception performance deterioration for the UE 406 or the IAB donor 402.
  • FIGs. 5A and 5B show an exemplary system model 400 of a full-duplex wireless communication system in which a child IAB node experiences or causes interference to another IAB node in the full-duplex wireless communication system.
  • IAB nodes 502, 504, and 506 may each be examples of a BS 110, shown in FIG. 1.
  • IAB donor 502 may transmit downlink signaling to IAB node 504 on the downlink portion of a backhaul link 510, which may be regarded as a relay node through which data can be transmitted from IAB donor 502 to child IAB node 506.
  • IAB node 504 may transmit downlink signaling to child IAB node 506 via the downlink portion of an access link 520.
  • the interference 530 from backhaul link 510 to access link 520 may cause data reception performance deterioration for the child IAB node 506.
  • data reception performance deterioration may be experienced at IAB donor 502 in an uplink scenario where interference 530 is caused by the child IAB node transmitting signaling to the IAB node 504 via an uplink portion of the access link 520 while IAB node 504 transmits uplink signaling to the IAB donor 502 via an uplink portion of the backhaul link 510.
  • a downlink UE or IAB node may suffer from co-channel interference from a paired uplink UE or IAB node.
  • the strength of the interference may vary based on the distance between the downlink and uplink UEs or IAB nodes and may also vary based on uplink transmission beamforming by the uplink UEs or IAB nodes. In some cases, if the downlink UE or IAB node has more than one receive antenna and performs coherent antenna reception, interference strength may also vary based on the spatial direction of the interference signal.
  • Cross-Link Interference (CLI) handling may allow a UE in one cell to measure interference from UEs in other cells.
  • a set of sounding reference signal (SRS) resources may be configured for a victim UE (i.e., a UE experiencing interference) and an aggressor UE (i.e., a UE causing interference) by a network entity, as SRS may be multiplexed.
  • the victim UE may be configured to measure the strength of the SRS sent by the aggressor UEs in neighboring cells.
  • the victim and aggressor UEs may be located in different cells, and because of backhaul data rate and latency considerations, the victim UE may report a layer-3 measurement result, such as an SRS reference signal received power (RSRP) or CLI reference signal strength indicator (RSSI) .
  • RSRP SRS reference signal received power
  • RSSI CLI reference signal strength indicator
  • information about an SRS configuration may be transferred on the backhaul between the base stations of the victim cell and the aggressor cell. Due to backhaul transfer latency, the SRS configuration may be transferred using a static or semi-static mode, and thus, the SRS measurement may be configured in a static or semi-static pattern.
  • these CLI techniques may be used for long-term interference management, such as allocating non-overlapping radio resources to an aggressor UE and a victim UE, which may reduce system capacity and radio resource reuse.
  • inter-device interference may be measured and reported based on SRS reception such that an aggressor UE or IAB (e.g., an uplink UE or IAB) is scheduled to transmit an SRS on a resource identified by a victim UE or IAB (e.g., a downlink UE or IAB) .
  • an aggressor UE or IAB e.g., an uplink UE or IAB
  • a victim UE or IAB e.g., a downlink UE or IAB
  • dynamic configuration for each of these wireless communication devices to transmit or receive SRSs individually with dedicated signaling may impose a resource overhead and may thus reduce cell throughput and transmission robustness.
  • victim and aggressor wireless communication devices may use the same SRS, and many configuration parameters may be identical for victim and aggressor wireless communication devices. Because victim and aggressor wireless communication devices may use the same SRS resources and similar configuration parameters, aspects described herein may use this characteristic to efficiently configure SRS resources for a group of wireless communication devices. By configuring SRS resources for a group of wireless communication devices for inter-device interference measurement, control channel resource consumption may be reduced, which may improve SRS measurement capacity and data transfer throughput.
  • FIG. 6 is a flow diagram illustrating example operations 600 for wireless communication, in accordance with certain aspects of the present disclosure.
  • the operations 600 may be performed, for example, by a wireless communication device such as an IAB node (e.g., such as a BS 110 in the wireless communication network 100, shown in FIG. 1) or a UE (e.g., such as a UE 120 in the wireless communication network 100, shown in FIG. 1) .
  • Operations 600 may be implemented as software components that are executed and run on one or more processors (e.g., controller/processor 240 or 280 of FIG. 2) .
  • the transmission and reception of signals by wireless communication device in operations 600 may be enabled, for example, by one or more antennas (e.g., antennas 234 or 252 of FIG. 2) .
  • the transmission and/or reception of signals by the wireless communication device may be implemented via a bus interface of one or more processors (e.g., controller/processor 240 or 280) obtaining and/or outputting signals.
  • the operations 600 may begin, at block 602, with the wireless communication device receiving, from a network entity, a group sounding reference signal (SRS) configuration for a group of devices including the wireless communication device.
  • SRS group sounding reference signal
  • Operations 600 may continue, at block 604, with the wireless communication device taking one or more actions based on an action indicator for the wireless communication device included in the group SRS configuration.
  • FIG. 7 is a flow diagram illustrating example operations 700 for wireless communication, in accordance with certain aspects of the present disclosure.
  • the operations 700 may be performed, for example, by a network entity (e.g., such as a base station 110 in the wireless communication network 100, shown in FIG. 1) .
  • the operations 700 may be complimentary operations by the network entity to the operations 600 performed by the wireless communication device.
  • Operations 700 may be implemented as software components that are executed and run on one or more processors (e.g., controller/processor 240 of FIG. 2) .
  • the transmission and reception of signals by the network entity in operations 700 may be enabled, for example, by one or more antennas (e.g., antennas 234 of FIG. 2) .
  • the transmission and/or reception of signals by the network entity may be implemented via a bus interface of one or more processors (e.g., controller/processor 240) obtaining and/or outputting signals.
  • the operations 700 may begin, at block 702, by the network entity transmitting, to a group of devices, a group sounding reference signal (SRS) configuration for the group of devices.
  • SRS group sounding reference signal
  • Operations 700 may continue, at block 704, with the network entity receiving, from at least one wireless communication device in the group of devices, a measurement based on an action indicator included in the group SRS configuration for the at least one wireless communication device.
  • the group SRS configuration may be transmitted as a group-common downlink control information (DCI) to a group of UEs.
  • DCI downlink control information
  • the group SRS configuration may indicate whether a wireless communication device (e.g., a UE or an IAB node) is to transmit or receive SRS signals.
  • the group SRS configuration may include SRS-related action indicators for each device regarding at least one SRS resource.
  • An SRS resource may be represented, for example, by a particular time-frequency resource, a set of comb bins, or a set of cyclic shifts and a frequency hopping pattern.
  • the group SRS configuration may include a common SRS resource indicator (SRI) and a respective action indicator for each wireless communication device in the group of devices.
  • the common SRI may indicate one or more SRS resources on which each wireless communication device in the group of devices is to take one or more actions.
  • the action indicator for each wireless communication device in the group of devices may indicate whether the respective wireless communication device is to transmit an SRS on the resource (s) identified in the common SRI, receive an SRS on the resource (s) identified in the common SRI, or refrain from taking any action with respect to the resource (s) identified in the common SRI.
  • the group SRS configuration may include multiple SRIs.
  • the group SRS configuration may explicitly indicate which SRI is applicable for each wireless communication device in the group of devices.
  • one or multiple devices e.g., UEs, IAB nodes, etc.
  • a single device in the group of devices may have an action indicator indicating that the device is to transmit an SRS on the SRS resource.
  • the group SRS configuration may include an action indicator for each wireless communication device in a group of devices.
  • the group of devices may include a plurality of downlink (victim) wireless communication devices (e.g., UEs or IAB nodes) and a single uplink (aggressor) wireless communication device.
  • the group SRS configuration may not include an SRI.
  • the devices may use a common SRS resource, which may be configured a priori.
  • the common SRS resource may be configured via higher-layer signaling, such as in radio resource control (RRC) signaling, in a medium access control (MAC) control element (CE) , or in downlink control information (DCI) from a network entity.
  • RRC radio resource control
  • MAC medium access control
  • CE control element
  • DCI downlink control information
  • the action indicator index for each UE may be configured a priori via higher-layer signaling (e.g., RRC signaling) or in a MAC-CE.
  • the group SRS configuration may be mapped on a common search space of a PDCCH resource or a control resource set (CORESET) .
  • Each action indicator may be quantized to a number of bits corresponding to a number of actions that a device may be configured to perform. For example, where the actions that a UE can perform include transmitting an SRS, receiving an SRS, or refraining from transmitting or receiving an SRS, the action indicator may be quantized to a two-bit value.
  • the group SRS configuration may include other content related to the SRS.
  • the group SRS configuration may include an SRS power parameter, such as a power control parameter, a power difference relative to a physical uplink shared channel, or the like.
  • the group SRS configuration may include SRS beamforming parameters, such as whether SRS beamforming is codebook-based or non-codebook based, a number of ports to use for transmitting or receiving SRS, or the like.
  • the group SRS configuration may be transmitted using a special radio network temporary identifier (RNTI) , referred to as an SRS-measurement-RNTI.
  • RNTI radio network temporary identifier
  • the cyclic redundancy check (CRC) bits of the group SRS configuration may be scrambled using the SRS-measurement-RNTI, and a network entity may configure each wireless communication device in the group of devices with a SRS-measurement-RNTI value and to blindly decode the group SRS configuration (e.g., downlink control information (DCI) ) based on the SRS-measurement-RNTI value.
  • DCI downlink control information
  • the content of the group SRS configuration may be divided into n blocks, with each block being associated with a specific wireless communication device in the group of devices.
  • Each block generally includes an SRI and an action indicator and may include other information, as discussed above.
  • each device may be configured a priori with a block index value.
  • the group SRS configuration may include blocks for n devices sequentially, and each UE may retrieve its respective SRI and action indicator at a position in the group SRS configuration associated with the UE’s respective block index value. For example, given an array with indices 0-n-1 and a universe of block indices from 0 through n-1, each UE may retrieve the SRI and action indicator at a position in the array identified by the block index associated with that UE.
  • the group SRS configuration may include blocks for a subset of devices in the group of devices, and each block in the group SRS configuration may include the associated block index.
  • a UE may search for a block including the UE’s block index and, if not found, determine that the UE is to refrain from performing any activity with respect to an SRS resource.
  • a device may explore a search space for the group SRS configuration and may blindly decode the group SRS configuration based on the pre-configured SRS-measurement-RNTI value. If the device successfully receives the group SRS configuration (i.e., successfully decodes the group SRS configuration from the search space) , the UE may examine the group SRS configuration to determine whether its pre-configured block index is included in the group SRS configuration. If the pre-configured block index for the UE is included, the UE can examine the action indicator to determine which action to take with respect to an SRS resource. Otherwise, the UE can refrain from taking any action with respect to the SRS resource included in the group SRS configuration.
  • a network entity e.g., a gNodeB, base station, IAB node, etc.
  • a network entity e.g., a gNodeB, base station, IAB node, etc.
  • a network entity can efficiently configure an SRS resource and trigger a group of wireless communication devices to perform inter-device interference measurement.
  • aspects described herein can reduce control channel resource consumption, improvement SRS measurement capacity, and improve data transfer throughput in a full duplex system.
  • FIG. 8 illustrates a communications device 800 that may include various components (e.g., corresponding to means-plus-function components) configured to perform operations for the techniques disclosed herein, such as the operations illustrated in FIG. 6.
  • the communications device 800 includes a processing system 802 coupled to a transceiver 808.
  • the transceiver 808 is configured to transmit and receive signals for the communications device 800 via an antenna 810, such as the various signals as described herein.
  • the processing system 802 may be configured to perform processing functions for the communications device 800, including processing signals received and/or to be transmitted by the communications device 800.
  • the processing system 802 includes a processor 804 coupled to a computer-readable medium/memory 812 via a bus 806.
  • the computer-readable medium/memory 812 is configured to store instructions (e.g., computer-executable code) that when executed by the processor 804, cause the processor 804 to perform the operations illustrated in FIG. 6, or other operations for performing the various techniques discussed herein for measuring SRS based on a group SRS configuration in a full-duplex communication system.
  • computer-readable medium/memory 812 stores code 814 for receiving, from a network entity, a group sounding reference signal (SRS) configuration for a group of devices including the wireless communication device and code 816 for taking one or more actions based on an action indicator for the wireless communication device included in the group SRS configuration.
  • the processor 804 has circuitry configured to implement the code stored in the computer-readable medium/memory 812.
  • the processor 804 includes circuitry 820 for receiving, from a network entity, a group sounding reference signal (SRS) configuration for a group of devices including the wireless communication device and circuitry 822 for taking one or more actions based on an action indicator for the wireless communication device included in the group SRS configuration.
  • SRS group sounding reference signal
  • FIG. 9 illustrates a communications device 900 that may include various components (e.g., corresponding to means-plus-function components) configured to perform operations for the techniques disclosed herein, such as the operations illustrated in FIG. 7.
  • the communications device 900 includes a processing system 902 coupled to a transceiver 908.
  • the transceiver 908 is configured to transmit and receive signals for the communications device 900 via an antenna 910, such as the various signals as described herein.
  • the processing system 902 may be configured to perform processing functions for the communications device 900, including processing signals received and/or to be transmitted by the communications device 900.
  • the processing system 902 includes a processor 904 coupled to a computer-readable medium/memory 912 via a bus 906.
  • the computer-readable medium/memory 912 is configured to store instructions (e.g., computer-executable code) that when executed by the processor 904, cause the processor 904 to perform the operations illustrated in FIG. 7, or other operations for performing the various techniques discussed herein for configuring devices in a full-duplex communications system with a group SRS configuration.
  • computer-readable medium/memory 912 stores code 914 for transmitting, to a group of devices, a group sounding reference signal (SRS) configuration for the group of devices and code 916 for receiving, from at least one wireless communication device in the group of devices, a measurement based on an action indicator included in the group SRS configuration for the at least one wireless communication device.
  • the processor 904 has circuitry configured to implement the code stored in the computer-readable medium/memory 912.
  • the processor 904 includes circuitry 920 for transmitting, to a group of devices, a group sounding reference signal (SRS) configuration for the group of devices and circuitry 922 for receiving, from at least one wireless communication device in the group of devices, a measurement based on an action indicator included in the group SRS configuration for the at least one wireless communication device.
  • SRS group sounding reference signal
  • the methods disclosed herein comprise one or more steps or actions for achieving the methods.
  • the method steps and/or actions may be interchanged with one another without departing from the scope of the claims.
  • the order and/or use of specific steps and/or actions may be modified without departing from the scope of the claims.
  • a phrase referring to “at least one of” a list of items refers to any combination of those items, including single members.
  • “at least one of: a, b, or c” is intended to cover a, b, c, a-b, a-c, b-c, and a-b-c, as well as any combination with multiples of the same element (e.g., a-a, a-a-a, a-a-b, a-a-c, a-b-b, a-c-c, b-b, b-b-b, b-b-c, c-c, and c-c-c or any other ordering of a, b, and c) .
  • determining encompasses a wide variety of actions. For example, “determining” may include calculating, computing, processing, deriving, investigating, looking up (e.g., looking up in a table, a database or another data structure) , ascertaining and the like. Also, “determining” may include receiving (e.g., receiving information) , accessing (e.g., accessing data in a memory) and the like. Also, “determining” may include resolving, selecting, choosing, establishing and the like.
  • the various operations of methods described above may be performed by any suitable means capable of performing the corresponding functions.
  • the means may include various hardware and/or software component (s) and/or module (s) , including, but not limited to a circuit, an application specific integrated circuit (ASIC) , or processor.
  • ASIC application specific integrated circuit
  • DSP digital signal processor
  • ASIC application specific integrated circuit
  • FPGA field programmable gate array
  • PLD programmable logic device
  • a general-purpose processor may be a microprocessor, but in the alternative, the processor may be any commercially available processor, controller, microcontroller, or state machine.
  • a processor may also be implemented as a combination of computing devices, e.g., a combination of a DSP and a microprocessor, a plurality of microprocessors, one or more microprocessors in conjunction with a DSP core, or any other such configuration.
  • an example hardware configuration may comprise a processing system in a wireless node.
  • the processing system may be implemented with a bus architecture.
  • the bus may include any number of interconnecting buses and bridges depending on the specific application of the processing system and the overall design constraints.
  • the bus may link together various circuits including a processor, machine-readable media, and a bus interface.
  • the bus interface may be used to connect a network adapter, among other things, to the processing system via the bus.
  • the network adapter may be used to implement the signal processing functions of the PHY layer.
  • a user interface e.g., keypad, display, mouse, joystick, etc.
  • a user interface e.g., keypad, display, mouse, joystick, etc.
  • the bus may also link various other circuits such as timing sources, peripherals, voltage regulators, power management circuits, and the like, which are well known in the art, and therefore, will not be described any further.
  • the processor may be implemented with one or more general-purpose and/or special-purpose processors. Examples include microprocessors, microcontrollers, DSP processors, and other circuitry that can execute software. Those skilled in the art will recognize how best to implement the described functionality for the processing system depending on the particular application and the overall design constraints imposed on the overall system.
  • the functions may be stored or transmitted over as one or more instructions or code on a computer readable medium.
  • Software shall be construed broadly to mean instructions, data, or any combination thereof, whether referred to as software, firmware, middleware, microcode, hardware description language, or otherwise.
  • Computer-readable media include both computer storage media and communication media including any medium that facilitates transfer of a computer program from one place to another.
  • the processor may be responsible for managing the bus and general processing, including the execution of software modules stored on the machine-readable storage media.
  • a computer-readable storage medium may be coupled to a processor such that the processor can read information from, and write information to, the storage medium. In the alternative, the storage medium may be integral to the processor.
  • the machine-readable media may include a transmission line, a carrier wave modulated by data, and/or a computer readable storage medium with instructions stored thereon separate from the wireless node, all of which may be accessed by the processor through the bus interface.
  • the machine-readable media, or any portion thereof may be integrated into the processor, such as the case may be with cache and/or general register files.
  • machine-readable storage media may include, by way of example, RAM (Random Access Memory) , flash memory, ROM (Read Only Memory) , PROM (Programmable Read-Only Memory) , EPROM (Erasable Programmable Read-Only Memory) , EEPROM (Electrically Erasable Programmable Read-Only Memory) , registers, magnetic disks, optical disks, hard drives, or any other suitable storage medium, or any combination thereof.
  • RAM Random Access Memory
  • ROM Read Only Memory
  • PROM Programmable Read-Only Memory
  • EPROM Erasable Programmable Read-Only Memory
  • EEPROM Electrical Erasable Programmable Read-Only Memory
  • registers magnetic disks, optical disks, hard drives, or any other suitable storage medium, or any combination thereof.
  • the machine-readable media may be embodied in a computer-program product.
  • a software module may comprise a single instruction, or many instructions, and may be distributed over several different code segments, among different programs, and across multiple storage media.
  • the computer-readable media may comprise a number of software modules.
  • the software modules include instructions that, when executed by an apparatus such as a processor, cause the processing system to perform various functions.
  • the software modules may include a transmission module and a receiving module. Each software module may reside in a single storage device or be distributed across multiple storage devices.
  • a software module may be loaded into RAM from a hard drive when a triggering event occurs.
  • the processor may load some of the instructions into cache to increase access speed.
  • One or more cache lines may then be loaded into a general register file for execution by the processor.
  • any connection is properly termed a computer-readable medium.
  • the software is transmitted from a website, server, or other remote source using a coaxial cable, fiber optic cable, twisted pair, digital subscriber line (DSL) , or wireless technologies such as infrared (IR) , radio, and microwave
  • the coaxial cable, fiber optic cable, twisted pair, DSL, or wireless technologies such as infrared, radio, and microwave are included in the definition of medium.
  • Disk and disc include compact disc (CD) , laser disc, optical disc, digital versatile disc (DVD) , floppy disk, and Blu-ray disc where disks usually reproduce data magnetically, while discs reproduce data optically with lasers.
  • computer-readable media may comprise non-transitory computer-readable media (e.g., tangible media) .
  • computer-readable media may comprise transitory computer-readable media (e.g., a signal) . Combinations of the above should also be included within the scope of computer-readable media.
  • certain aspects may comprise a computer program product for performing the operations presented herein.
  • a computer program product may comprise a computer-readable medium having instructions stored (and/or encoded) thereon, the instructions being executable by one or more processors to perform the operations described herein.
  • modules and/or other appropriate means for performing the methods and techniques described herein can be downloaded and/or otherwise obtained by a user terminal and/or base station as applicable.
  • a user terminal and/or base station can be coupled to a server to facilitate the transfer of means for performing the methods described herein.
  • various methods described herein can be provided via storage means (e.g., RAM, ROM, a physical storage medium such as a compact disc (CD) or floppy disk, etc. ) , such that a user terminal and/or base station can obtain the various methods upon coupling or providing the storage means to the device.
  • storage means e.g., RAM, ROM, a physical storage medium such as a compact disc (CD) or floppy disk, etc.
  • CD compact disc
  • floppy disk etc.
  • any other suitable technique for providing the methods and techniques described herein to a device can be utilized.

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Abstract

Certains aspects de la présente divulgation concernent des techniques pour configurer un groupe de dispositifs de communication sans fil pour effectuer une ou plusieurs actions par rapport à un signal de référence de sondage (SRS) dans un système de communication sans fil en duplex intégral. Un procédé donné à titre d'exemple consiste d'une manière générale à recevoir, en provenance d'une entité de réseau, une configuration de signal de référence de sondage (SRS) de groupe pour un groupe de dispositifs comprenant le dispositif de communication sans fil; et à prendre une ou plusieurs actions sur la base d'un indicateur d'action pour le dispositif de communication sans fil inclus dans la configuration de SRS de groupe.
PCT/CN2020/096022 2020-06-15 2020-06-15 Configuration de signal de référence de sondage (srs) de groupe en duplex intégral WO2021253142A1 (fr)

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