EP3834358A1 - Activation de signaux de référence spécifiques à une cellule (crs) pour une amélioration de performance de canal de commande de liaison descendante physique de communication de type machine (mpdcch) - Google Patents

Activation de signaux de référence spécifiques à une cellule (crs) pour une amélioration de performance de canal de commande de liaison descendante physique de communication de type machine (mpdcch)

Info

Publication number
EP3834358A1
EP3834358A1 EP19847984.2A EP19847984A EP3834358A1 EP 3834358 A1 EP3834358 A1 EP 3834358A1 EP 19847984 A EP19847984 A EP 19847984A EP 3834358 A1 EP3834358 A1 EP 3834358A1
Authority
EP
European Patent Office
Prior art keywords
crs
mpdcch
mapping
dmrs
antenna ports
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP19847984.2A
Other languages
German (de)
English (en)
Other versions
EP3834358A4 (fr
Inventor
Gregory V. Morozov
Qiaoyang Ye
Debdeep CHATTERJEE
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Intel Corp
Original Assignee
Intel Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Intel Corp filed Critical Intel Corp
Priority to EP24163937.6A priority Critical patent/EP4362406A3/fr
Publication of EP3834358A1 publication Critical patent/EP3834358A1/fr
Publication of EP3834358A4 publication Critical patent/EP3834358A4/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/0413—MIMO systems
    • H04B7/0456—Selection of precoding matrices or codebooks, e.g. using matrices antenna weighting
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L25/00—Baseband systems
    • H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
    • H04L25/0202—Channel estimation
    • H04L25/0224—Channel estimation using sounding signals
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0048—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
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0053—Allocation of signaling, i.e. of overhead other than pilot signals
    • 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
    • H04L5/0091—Signaling for the administration of the divided path
    • H04L5/0094—Indication of how sub-channels of the path are allocated
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
    • H04W4/70—Services for machine-to-machine communication [M2M] or machine type communication [MTC]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/02—Arrangements for detecting or preventing errors in the information received by diversity reception
    • H04L1/06—Arrangements for detecting or preventing errors in the information received by diversity reception using space diversity
    • H04L1/0606—Space-frequency coding
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/0001—Arrangements for dividing the transmission path
    • H04L5/0014—Three-dimensional division
    • H04L5/0023—Time-frequency-space
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0053—Allocation of signaling, i.e. of overhead other than pilot signals
    • H04L5/0057—Physical resource allocation for CQI

Definitions

  • the present disclosure relates to enhanced machine type communication (eMTC) systems, and in particular, to a system and a method to enable coherent demodulation of machine type communication physical downlink control channel (MPDCCH) associated with the eMTC system, based on cell-specific reference signal (CRS) and demodulation reference signals (DMRS) associated with the MPDCCH.
  • MPDCCH physical downlink control channel
  • CRS cell-specific reference signal
  • DMRS demodulation reference signals
  • Enhanced Machine Type Communication is a type of LTE-M network published by 3GPP in the Release 13 specification.
  • eMTC Is a low power wide area technology which supports internet of things (!oT) through lower device complexity and provides enhanced coverage, leveraging a mobile carriers existing LTE base stations.
  • An eMTC UE is only required to monitor a specific narrowband for upload and download (UL/DL) transmissions as against the complete system bandwidth in traditional LTE. Since eMTC UEs only care about a narrowband of six resource blocks (RBs) at a time, the traditional long-term evolution (LTE) channels that are carried in whole-system bandwidth (PDCCH, PHICH, PGF!GH) cannot be reused for eMTC. This necessitates a need for another mechanism to send control information to UEs Therefore, a new channel called machine type communication physical downlink control channel
  • MPDCCH Physical downlink shared channel
  • Fig. 1 illustrates a simplified block diagram of an enhanced machine type communication (eMTC) system, according to one embodiment of the disclosure.
  • eMTC enhanced machine type communication
  • FIG. 2 illustrates a block diagram of an apparatus employable at a Base Station (BS), eNodeB, gNodeB or other network device that can enable a user equipment (UE) to perform coherent demodulation of machine type communication physical downlink control channel (MPDCCH) based on cell-specific reference signals (CRS) and demodulation reference signals (DMRS), according to various aspects described herein.
  • BS Base Station
  • eNodeB eNodeB
  • gNodeB gNodeB or other network device that can enable a user equipment (UE) to perform coherent demodulation of machine type communication physical downlink control channel (MPDCCH) based on cell-specific reference signals (CRS) and demodulation reference signals (DMRS), according to various aspects described herein.
  • MPDCCH physical downlink control channel
  • CRS cell-specific reference signals
  • DMRS demodulation reference signals
  • FIG. 3 illustrates a block diagram of an apparatus employable at a user equipment (UE) or other network device (e.g., loT device) that facilitates to perform coherent demodulation of machine type communication physical downlink control channel (MPDCCH) based on cell-specific reference signals (CRS) and demodulation reference signals (DMRS), according to various aspects described herein.
  • UE user equipment
  • loT device e.g., loT device
  • MPDCCH machine type communication physical downlink control channel
  • CRS cell-specific reference signals
  • DMRS demodulation reference signals
  • an apparatus configured to be employed in an eNodeB associated with a machine type communication (MTC) system.
  • the apparatus comprises one or more processors configured to configure a mapping between cell-specific reference signal (CRS) antenna ports and
  • DMRS demodulation reference signals
  • MPDCCH physical downlink control channel
  • the one or more processors is further configured to generate a physical channel configuration signal comprising one or more mapping information parameters indicative of the CRS-to- DMRS antenna port mapping, in order to provide information on the CRS-to-DMRS antenna port mapping to the UE.
  • the apparatus further comprises a radio frequency (RF) interface, configured to provide, to a radio frequency (RF) circuitry, the physical channel configuration signal, for subsequent transmission to the UE.
  • RF radio frequency
  • an apparatus configured to be employed in a user equipment (UE) associated with a machine type communication (MTC) system.
  • the apparatus comprises one or more processors configured to process a physical channel configuration signal, received from an eNodeB associated therewith, wherein the physical channel configuration signal comprises one or more mapping information parameters indicative of a mapping between cell-specific reference signal (CRS) antenna ports and demodulation reference signals (DMRS) antenna ports for an MTC physical downlink control channel (MPDCCH) associated with a UE, forming a CRS-to-DMRS antenna port mapping.
  • CRS cell-specific reference signal
  • DMRS demodulation reference signals
  • the one or more processors is further configured to determine the CRS-to-DMRS antenna port mapping, based on processing the physical channel configuration signal; and perform coherent demodulation of the MPDCCH, based on CRS and DMRS, in accordance with the determined CRS-to-DMRS antenna port mapping.
  • a computer readable storage device storing executable instructions that, in response to execution, cause one or more processors of an eNodeB to perform operations.
  • the operations comprise configuring a mapping between cell-specific reference signal (CRS) antenna ports and demodulation reference signals (DMRS) antenna ports for an MTC physical downlink control channel (MPDCCH) associated with a UE, forming a CRS-to-DMRS antenna port mapping, to be provided to the UE, in order to enable the UE to perform coherent demodulation of the MPDCCH based on CRS and DMRS.
  • CRS cell-specific reference signal
  • DMRS demodulation reference signals
  • the operations further comprise generating a physical channel configuration signal comprising one or more mapping information parameters indicative of the CRS-to-DMRS antenna port mapping, in order to provide information on the CRS- to-DMRS antenna port mapping to the UE; and providing the physical channel configuration signal, to a radio frequency (RF) circuitry, for subsequent transmission to the UE.
  • RF radio frequency
  • a component can be a processor (e.g., a microprocessor, a controller, or other processing device), a process running on a processor, a controller, an object, an executable, a program, a storage device, a computer, a tablet PC and/or a user equipment (e.g., mobile phone, etc.) with a processing device.
  • a processor e.g., a microprocessor, a controller, or other processing device
  • a process running on a processor e.g., a microprocessor, a controller, or other processing device
  • an object running on a server and the server
  • a user equipment e.g., mobile phone, etc.
  • an application running on a server and the server can also be a component.
  • One or more components can reside within a process, and a component can be localized on one computer and/or distributed between two or more computers.
  • a set of elements or a set of other components can be described herein, in which the term“set”
  • these components can execute from various computer readable storage media having various data structures stored thereon such as with a module, for example.
  • the components can communicate via local and/or remote processes such as in accordance with a signal having one or more data packets (e.g., data from one component interacting with another component in a local system, distributed system, and/or across a network, such as, the Internet, a local area network, a wide area network, or similar network with other systems via the signal).
  • a signal having one or more data packets (e.g., data from one component interacting with another component in a local system, distributed system, and/or across a network, such as, the Internet, a local area network, a wide area network, or similar network with other systems via the signal).
  • a component can be an apparatus with specific functionality provided by mechanical parts operated by electric or electronic circuitry, in which the electric or electronic circuitry can be operated by a software application or a firmware application executed by one or more processors.
  • the one or more processors can be internal or external to the apparatus and can execute at least a part of the software or firmware application.
  • a component can be an apparatus that provides specific functionality through electronic components without mechanical parts; the electronic components can include one or more processors therein to execute software and/or firmware that confer(s), at least in part, the functionality of the electronic components.
  • the term“or” is intended to mean an inclusive“or” rather than an exclusive“or”. That is, unless specified otherwise, or clear from context, “X employs A or B” is intended to mean any of the natural inclusive permutations. That is, if X employs A; X employs B; or X employs both A and B, then“X employs A or B” is satisfied under any of the foregoing instances.
  • the articles“a” and“an” as used in this application and the appended claims should generally be construed to mean“one or more” unless specified otherwise or clear from context to be directed to a singular form.
  • the terms “including”, “includes”, “having”, “has”, “with”, or variants thereof are used in either the detailed description and the claims, such terms are intended to be inclusive in a manner similar to the term
  • MPDCCH machine type communication physical downlink control channel
  • the MPDCCH plays a crucial role at the Evolved Terrestrial Radio Access Network (E-UTRAN) physical layer because all downlink (DL) scheduling assignments as well as uplink (UL) scheduling grants are delivered to eMTC UEs via this channel.
  • E-UTRAN Evolved Terrestrial Radio Access Network
  • the eMTC UEs are further referred to as bandwidth-reduced low complexity/coverage-enhanced (BL/CE) UEs, LTE-M1 UEs, CAT-M1 UEs etc.
  • the BL/CE UEs operates on a bandwidth 1 .08 MHz (i.e., 6 PRB's) within an existing LTE deployment, or 1.4 MHz in standalone deployment.
  • An eMTC UE or BL/CE UE is only required to monitor a specific narrowband for upload and download (UL/DL) transmissions as against the complete system bandwidth in traditional LTE.
  • dedicated reference signals are used for coherent demodulation of MPDCCH.
  • the dedicated reference signals for MPDCCH comprise demodulation reference signals (DMRS).
  • DMRS demodulation reference signals
  • Tx transmit
  • CRS cell-specific reference signals
  • the use of CRS in addition to the DMRS of MPDCCH may potentially improve the overall MPDCCH performance, for example, by providing better channel estimation.
  • the CRS are transmitted from other logical antenna ports than DMRS of MPDCCH.
  • the mapping of the physical antenna ports to the logical antenna ports, i.e., precoding, for CRS is different from the DMRS of MPDCCH. Therefore, in order to exploit the CRS for MPDCCH demodulation, the BL/CE UEs should know how the antenna ports of DMRS of MPDCCH are mapped to CRS antenna ports.
  • a system and a method to configure a mapping between the CRS antenna ports and the DMRS antenna ports for the MPDCCH associated with the UE is disclosed herein.
  • an eNodeB configured to configure a mapping between the CRS antenna ports and the DMRS antenna ports for the MPDCCH, based on a predefined codebook, is proposed.
  • utilizing a mapping based on the predefined codebook provides time/frequency diversity which in turn improves the demodulation performance of MPDCCH in scenarios with fading channels and high moving speed of
  • performing coherent demodulation of the MPDCCH based on CRS and DMRS refers to the demodulation of MPDCCH based on a channel estimate derived based on CRS and DMRS.
  • Fig. 1 illustrates a simplified block diagram of an enhanced machine type communication (eMTC) system 100, according to one embodiment of the disclosure.
  • the eMTC system 100 comprises an eNodeB 102 and a user equipment (UE) 104.
  • the eMTC system 100 can comprise a plurality of eNodeBs and UEs.
  • the eNodeB 102 is equivalent to a base station, an gNodeB in new radio (NR) systems etc.
  • the UE 104 may comprise a mobile phone, tablet computer, an internet of things (loT) device etc.
  • LoT internet of things
  • the eNodeB 102 and the UE 104 are configured to communicate with one another over a communication medium (e.g., air).
  • the UE 104 may comprise a bandwidth reduced low complexity coverage enhancement (BL/CE) UEs.
  • the eNodeB 102 is configured to provide demodulation reference signals (DMRS) 106 to the UE 104.
  • the DMRS 106 enables the UE 102 to perform demodulation of a machine type communication physical downlink control channel (MPDCCH) associated with the eMTC system 100.
  • MPDCCH machine type communication physical downlink control channel
  • the eNodeB 102 is further configured to provide cell-specific reference signals (CRS) 108 to the UE 104.
  • CRS cell-specific reference signals
  • the UE 104 is configured to perform a coherent demodulation of the MPDCCH jointly based on the DMRS 106 and the CRS 108. in some embodiments, the UE 104 is configured to perform the demodulation of the MPDCCH jointly based on the DMRS 106 and the CRS 108, in accordance with an information on a mapping between CRS antenna ports and DMRS antenna ports for the MPDCCH associated with the UE 104.
  • the eNodeB 102 is further configured to generate and provide a physical channel configuration signal 1 10 comprising one or more mapping information parameters indicative of the mapping between CRS antenna ports and DMRS antenna ports for the MPDCCH to the UE 104.
  • the eNodeB 102 is further configured to configure the mapping between the CRS antenna ports and the DMRS antenna ports for the MPDCCH associated with the UE 104, forming a CRS-to-DMRS antenna port mapping (or referred to herein as a CRS-to- DMRS antenna port mapping).
  • the CRS-to-DMRS antenna port mapping comprises a UE-specific mapping.
  • the CRS-to-DMRS antenna port mapping is configured specifically for a select UE (e.g., the UE 104 in Fig. 1 ) associated with the eNodeB 102.
  • the CRS-to-DMRS antenna port mapping may be applicable to one or more UEs associated with the eNodeB 102.
  • the CRS-to-DMRS antenna port mapping may comprise a cell-specific mapping that is applicable to all the BL/CE UEs (for example, those which are capable of coherent demodulation of the MPDCCH based on CRS and DMRS) associated with the eNodeB 102.
  • the eNodeB 102 is configured to provide the physical channel configuration signal 1 10 comprising information indicative of the CRS-to-DMRS antenna port mapping, to the UE 104 via radio resource control (RRC) protocol.
  • RRC radio resource control
  • RRC messages with UE-specific signaling are delivered via physical downlink shared channel (PDSCH).
  • PDSCH is scheduled to BL/CE UEs (e.g., the UE 104) by MPDCCH. Therefore, in such embodiments, at the initial steps the UE 104 may demodulate MPDCCH relying on DMRS only. Later, after receiving the mapping information, the UE 104 may demodulate MPDCCH transmissions jointly based on the CRS 108 and the DMRS 106.
  • the eNodeB 102 is configured to provide the physical channel configuration signal 1 10 comprising information indicative of the CRS-to-DMRS antenna port mapping, to the UE 104 via system information (SI) messages, e.g., SIB1 -BR or SIBx-BR (x >1 ).
  • SI system information
  • the SI messages for BL/CE UEs are conveyed directly using PDSCH without dynamic scheduling via MPDCCH.
  • the UE 104 Upon receiving the physical channel configuration signal 1 10, the UE 104 is configured to process the physical channel configuration signal 1 10, and determine the CRS-to-DMRS antenna port mapping, based on processing the physical channel configuration signal 1 10. In some embodiments, the UE 102 is further configured to perform coherent demodulation of the MPDCCH based on the CRS 108 and the DMRS 106, in accordance with the determined CRS-to-DMRS antenna port mapping. [0022] In some embodiments, the CRS-to-DMRS antenna port mapping comprises a single mapping configuration applicable to all search spaces associated with the MPDCCH. However, in other embodiments, the CRS-to-DMRS antenna port mapping may be separately configured for one or more search spaces associated with the MPDCCH.
  • the CRS-to-DMRS antenna port mapping comprises a first mapping between the CRS antenna ports and the DMRS antenna ports configured for common search space (CSS) of the MPDCCH, and a second mapping between the CRS antenna ports and the DMRS antenna ports configured for UE-specific search spaces (UESS) of the MPDCCH.
  • the first mapping for the CSS and the second mapping for the UESS are the same.
  • the first mapping for the CSS and the second mapping for the UESS may be different.
  • the physical channel configuration signal 1 10 may comprise a single signal configured to convey information on the CRS- to-DMRS antenna port mapping associated with one or more search spaces
  • the physical channel configuration signal 1 10 may comprise one or more signals configured to convey information on the CRS-to-DMRS antenna port mapping associated with one or more search spaces respectively, associated with the MPDCCH.
  • the physical channel configuration signal 1 10 may comprise a common physical channel configuration signal comprising one or more mapping information parameters indicative of the first mapping for the CSS of the MPDCCH and a UE-specific physical channel configuration signal comprising one or more mapping information parameters indicative of the second mapping for the UESS of the MPDCCH.
  • the eNodeB 102 is configured to provide the common physical channel configuration signal (indicative of the mapping for the CSS) to the UE 104 via system information (SI) messages. Further, the eNodeB 102 is configured to provide the UE-specific physical channel configuration signal (indicative of the mapping for the UESS) to the UE 104 via RRC messages.
  • the eNodeB 102 may configured to provide the common physical channel configuration signal and the UE-specific physical channel configuration signal to the UE 104 differently (e.g., both via SI messages or both via RRC messages).
  • the first mapping between the CRS antenna ports and the DMRS antenna ports configured for common search space (CSS) of the MPDCCH may comprise one or more mapping between the CRS antenna ports and the DMRS antenna ports configured respectively for one or more CSS types (e.g., Type 0, 1 , 2 etc.) associated with the MPDCCH.
  • the one or more mapping between the CRS antenna ports and the DMRS antenna ports configured respectively for the one or more CSS types associated with the MPDCCH may be same.
  • At least one mapping corresponding to one CSS type may be different from mapping associated with the other CSS types.
  • the CRS-to-DMRS antenna port mapping is configured as a function of narrowband (NB) associated with the MPDCCH. Further, in some embodiments, the CRS-to-DMRS antenna port mapping is configured as a function of the coverage enhancement (CE) mode (e.g., CE mode A or B) in which the MPDCCH is monitored for a given search space. In one example, for Type 2 CSS for MPDCCH (for random access), the CRS-to-DMRS antenna port mapping is configured corresponding to each physical random access channel (PRACH) resource set, in some embodiments.
  • PRACH physical random access channel
  • the CRS-to- DMRS antenna port mapping is defined corresponding to each paging occasion (PNB) and/or paging narrowband (PNB). Further, in some embodiments, the CRS-to-DMRS antenna port mapping is configured as a function of radio network temporary identifier (RNTI). In particular, the CRS-to-DMRS antenna port mapping may be separately configured for MPDCCH associated with different RNTIs, e.g., separate/different configurations of CRS-to-DMRS antenna port mapping for MPDCCH associated with C- RNTI, P-RNTI, RA-RNTI, and G-RNTI. In some embodiments, the different
  • DL downlink
  • MPDCCH MPDCCH transmissions may be targeted for.
  • the eNodeB 102 is configured to configure the CRS- to-DMRS antenna port mapping, based on a predefined codebook, as shown in Table 1 or Table 2 below.
  • the predefined codebook comprises a set of predefined precoding vectors/matrices known both at the UE 104 and the eNodeB 102.
  • the CRS-to-DMRS antenna port mapping is defined based on one or more precoding matrices of the set of precoding matrices associated with the predefined codebook.
  • codebooks specified in E-UTRAN for 2 and 4 antenna ports from Table 6.3.4.2.3-1 or Table 6.3.4.2.3-2 of the technical specification TS 36.21 1 corresponding to the single-layer transmission is reused for precoding of MPDCCH.
  • other codebooks may be used. Table 1 above illustrates the codebook specified in E-UTRAN for 2 antenna ports
  • a maximum number of CRS ports for MPDCCH is 4.
  • Table 1 is utilized for configuring the CRS-to-DMRS antenna port mapping, when the number of CRS antenna ports is less than or equal to 2. However, in embodiments where more than 2 CRS antenna ports are utilized, the CRS-to-DMRS antenna port mapping is configured based on Table 2.
  • Table 1 comprises a first column of precoding matrices corresponding to one CRS antenna port and a second column of precoding matrices corresponding to two CRS antenna ports. Further, Table 1 comprises an index column comprising a set of precoding matrix indices (PMIs). In some embodiments, each precoding matrix index identifies a respective precoding matrix from the predefined codebook, based on a number of layers (e.g., the number of CRS antenna ports).
  • Table 2 comprises a first column of precoding matrices corresponding to one CRS antenna port, a second column of precoding matrices corresponding to two CRS antenna ports, a third column of precoding matrices corresponding to three CRS antenna ports and a fourth column of precoding matrices corresponding to four CRS antenna ports.
  • Table 2 comprises an index column comprising a set of precoding matrix indices (PMIs).
  • each precoding matrix index identifies a respective precoding matrix from the predefined codebook, based on a number of layers (e.g., the number of CRS antenna ports).
  • the eNodeB 102 is configured to configure the CRS- to-DMRS antenna port mapping based on one or more precoding matrices, associated with the predefined codebook (e.g., Table 1 or Table 2). In some embodiments, the eNodeB 102 is further configured to provide information on the one or more precoding matrices to the UE 104, via the physical channel configuration signal 1 10. In some embodiments, the eNodeB 102 is configured to provide information of the one or more precoding matrices to the UE 104 based on providing the corresponding PMIs.
  • the predefined codebook e.g., Table 1 or Table 2
  • the one or more mapping information parameters associated with the physical channel configuration signal 1 10 comprises an index parameter comprising a precoding matrix index (PMI) associated with the predefined codebook.
  • PMI precoding matrix index
  • the PMI identifies a respective precoding matrix from the predefined codebook.
  • the UE 104 Upon receiving the physical channel configuration signal 1 10 from the eNodeB 102, the UE 104 is configured to identify the precoding matrix based on the PMI (by processing the physical channel configuration signal 1 10), and utilize the precoding matrix to determine a channel estimation of the MPDCCH based on both the DMRS 106 and the CRS 108, based on the precoding matrix.
  • determining channel estimation of the MPDCCH based on both DMRS 106 and CRS 108 comprises determining a channel estimation based on the CRS 108 and modifying the CRS based channel estimation based on utilizing the precoding matrix to get the channel estimation of the MPDCCH based on both the DMRS 106 and the CRS 108.
  • the UE 106 is subsequently configured to perform demodulation of the MPDCCH, based on the channel estimation derived based on both the DMRS 106 and the CRS 108.
  • the eNodeB 102 in order to enable time/frequency diversity, is configured to enable precoder cycling (i.e., precoder matrix cycling) in the frequency and/or time domains. In such embodiments, the eNodeB 102 is configured to configure PMI switching patterns as a function of frequency and/or time.
  • the PMI switching pattern comprises a pattern based on which the PMI associated with the predefined codebook is varied among a set of PMIs associated with the predefined codebook, as a function of frequency and/or time.
  • the eNodeB 102 is further configured to provide the PMI switching pattern to the UE 104, via the physical channel configuration signal 1 10.
  • the one or more mapping information parameters associated with the physical channel configuration signal 1 10 further comprises a switching pattern parameter indicative of the PMI switching pattern.
  • the one or more mapping information parameters further comprises an interval parameter indicative of intervals in frequency (e.g., one or more physical resource blocks (PRBs)) and/or periods in time (e.g., one or more subframes) based on which the PMI associated with the predefined codebook is varied, in accordance with the PMI switching pattern.
  • an interval parameter indicative of intervals in frequency e.g., one or more physical resource blocks (PRBs)
  • PRBs physical resource blocks
  • periods in time e.g., one or more subframes
  • the eNodeB 102 in order to reduce the number of precoders (i.e., the precoding matrices) for the cycling operation, is configured to include a PMI restriction parameter within the physical channel configuration signal 1 10.
  • the PMI restriction parameter restricts the PMIs within the set of PMIs associated with the predefined codebook among which the PMI is varied as a function of frequency or time, to less than all the PMIs associated with the predefined codebook.
  • the one or more mapping information parameters associated with the physical channel configuration signal 1 10 further comprises the PMI restriction parameter.
  • the PMI restriction parameter may be part of the technical specification (or predefined).
  • the PMI restriction parameter may be known to both the eNodeB 102 and the UE 104, and therefore need not be signaled to the UE 104 (as part of the physical channel configuration signal 1 10).
  • the precoder for MPDCCH is cycled over the indicated precoding vectors only. Therefore, to fix the precoder in time and frequency, in some embodiments, the PMI restriction parameter restricts the codebook subset to a single precoding vector/matrix only (e.g., a single PMI). For the options of enabling cycling of the precoding (or mapping) over a set or subset of possible precoding vectors, in order to enable cross-subframe channel estimation for MPDCCH
  • the UE 102 may assume that for a given PRB, the choice of the precoder/mapping from CRS to DMRS antenna ports is the same over NNB ch DL consecutive subframes, where NNB ch DL is the frequency hopping interval configured for the corresponding CE mode.
  • the precoders i.e., the precoding matrices
  • the eNodeB 102 may be configured to configure a one- to-one antenna port mapping between the CRS antenna ports and the DMRS antenna ports for the MPDCCH, when joint CRS and DMRS operation is enabled for MPDCCH. Therefore, in such embodiments, the CRS-to-DMRS antenna port mapping comprises one-to-one antenna port mapping. In such embodiments, the eNodeB 102 is configured to utilize Space-Frequency Block Coding (SFBC)/Switched Tx diversity for precoding MPDCCH.
  • SFBC Space-Frequency Block Coding
  • the SFBC and Switched Tx Diversity corresponding to the cases of 2 and 4 antenna ports, respectively defined in E-UTRAN [36.21 1 ], in order to transmit legacy physical downlink control channel (PDCCH) channel are reused for precoding MPDCCH.
  • the eNodeB 102 is further configured to provide information on the one-to-one antenna port mapping between the CRS antenna ports and DMRS antenna ports, to the UE 104, via the physical channel configuration signal 1 10.
  • the one or more mapping information parameters associated with the physical channel configuration signal 1 10 comprises a mapping parameter indicative of the one-to-one antenna port mapping between the CRS antenna ports and DMRS antenna ports.
  • the UE 104 may assume that the CRS antenna ports and the DMRS antenna ports are the same. In such embodiments, the UE 104 may be configured to perform channel estimation based on the CRS 108 or the DMRS 106. In some embodiments, the eNodeB 102 is further configured to provide information on the precoding method comprising the SFBC and Switched Tx Diversity to the UE 104.
  • the physical channel configuration signal 1 10 further comprises a precoding parameter indicative of the SFBC and Switched Tx Diversity precoding method associated with the MPDCCH, in order to enable the UE 104 to perform coherent demodulation of the MPDCCH based on the CRS 108 and the DMRS 106 (specifically, based on the channel estimate derived based on the DMRS 106 or the CRS 108).
  • the eNodeB 102 is configured to apply transmit (Tx) power boosting to enhanced control channel elements (ECCEs) of MPDCCH, in some embodiments.
  • the power boosting may be applied to both MPDCCH and its DMRS. Therefore, if the joint CRS and DMRS based demodulation for MPDCCH is enabled, information on a power offset between the CRS antenna ports and DMRS antenna ports is required at the UE 104, in order to demodulate the MPDCCH.
  • the eNodeB 102 may be further configured to determine the power offset between the CRS antenna ports and the DMRS antenna ports associated with the MPDCCH.
  • the eNodeB 102 is further configured to provide information on the power offset between the CRS antenna ports and the DMRS antenna ports associated with the MPDCCH to the UE 104 (e.g., as part of the physical channel configuration signal 1 10).
  • the physical channel configuration signal 1 10 may further comprise one or more power offset parameters indicative of the power offset between the CRS antenna ports and the DMRS antenna ports associated with the MPDCCH.
  • one or more possible values of the power offset between the CRS antenna ports and the DMRS antenna ports associated with the MPDCCH are predefined and is available to the UE 104.
  • the eNodeB 102 is configured to provide the physical channel configuration signal 1 10 to the UE 104, in response to receiving a UE capability signal 1 12 from the UE 104.
  • the UE capability signal 1 12 comprises an indication regarding a capability of the UE 104 to perform coherent demodulation of the MPDCCH jointly based on the CRS and the DMRS.
  • the UE 104 is further configured to generate the UE capability signal 1 12.
  • the eNodeB 102 may be configured to provide the physical channel configuration signal 1 10 to the UE 104, without receiving the UE capability signal 1 12 from the UE 104.
  • FIG. 2 illustrated is a block diagram of an apparatus 200 employable at a Base Station (BS), eNodeB, gNodeB or other network device that can enable a user equipment (UE) to perform coherent demodulation of machine type communication physical downlink control channel (MPDCCH) based on cell-specific reference signals (CRS) and demodulation reference signals (DMRS), according to various aspects described herein.
  • BS Base Station
  • eNodeB eNodeB
  • gNodeB gNodeB or other network device that can enable a user equipment (UE) to perform coherent demodulation of machine type communication physical downlink control channel (MPDCCH) based on cell-specific reference signals (CRS) and demodulation reference signals (DMRS), according to various aspects described herein.
  • MPDCCH machine type communication physical downlink control channel
  • CRS cell-specific reference signals
  • DMRS demodulation reference signals
  • the apparatus 200 can include one or more processors 210 comprising processing circuitry and associated interface(s) (e.g., a radio frequency interface), communication circuitry 220, which can comprise one or more of transmitter circuitry (e.g., associated with one or more transmit chains) or receiver circuitry (e.g., associated with one or more receive chains), wherein the transmitter circuitry and receiver circuitry can employ common circuit elements, distinct circuit elements, or a combination thereof), and memory 230 (which can comprise any of a variety of storage mediums and can store instructions and/or data associated with one or more of processor(s) 210 or communication circuitry 220).
  • processors 210 comprising processing circuitry and associated interface(s) (e.g., a radio frequency interface)
  • communication circuitry 220 which can comprise one or more of transmitter circuitry (e.g., associated with one or more transmit chains) or receiver circuitry (e.g., associated with one or more receive chains), wherein the transmitter circuitry and receiver circuitry can employ common circuit elements, distinct circuit elements, or a
  • the apparatus 200 can be included within an Evolved Universal Terrestrial Radio Access Network (E-UTRAN) Node B (Evolved Node B, eNodeB, or eNB), next generation Node B (gNodeB or gNB) or other base station or TRP (Transmit/Receive Point) in a wireless communications network.
  • E-UTRAN Evolved Universal Terrestrial Radio Access Network
  • Node B Evolved Node B, eNodeB, or eNB
  • next generation Node B gNodeB or gNB
  • TRP Transmit/Receive Point
  • the apparatus 200 could be included within the eNodeB 102 of Fig. 1 .
  • FIG. 3 illustrated is a block diagram of an apparatus 300 employable at a user equipment (UE) or other network device (e.g., loT device) that facilitates to perform coherent demodulation of machine type communication physical downlink control channel (MPDCCH) based on cell-specific reference signals (CRS) and demodulation reference signals (DMRS), according to various aspects described herein.
  • UE user equipment
  • loT device e.g., loT device
  • MPDCCH machine type communication physical downlink control channel
  • CRS cell-specific reference signals
  • DMRS demodulation reference signals
  • Apparatus 300 can include one or more processors 310 comprising processing circuitry and associated interface(s) (e.g., radio frequency interface), transceiver circuitry 320 (e.g., comprising RF circuitry, which can comprise transmitter circuitry (e.g., associated with one or more transmit chains) and/or receiver circuitry (e.g., associated with one or more receive chains) that can employ common circuit elements, distinct circuit elements, or a combination thereof), and a memory 330 (which can comprise any of a variety of storage mediums and can store instructions and/or data associated with one or more of processor(s) 310 or transceiver circuitry 320).
  • apparatus 300 can be included within a user equipment (UE).
  • UE user equipment
  • signals and/or messages can be generated and output for transmission, and/or transmitted messages can be received and processed.
  • outputting for transmission can comprise one or more of the following: generating a set of associated bits that indicate the content of the signal or message, coding (e.g., which can include adding a cyclic redundancy check (CRC) and/or coding via one or more of turbo code, low density parity-check (LDPC) code, tailbiting convolution code (TBCC), etc.), scrambling (e.g., based on a scrambling seed), modulating (e.g., via one of binary phase shift keying (BPSK), quadrature phase shift keying (QPSK), or some form of quadrature amplitude modulation (QAM), etc.), and/or resource mapping (e.g., to a scheduled set of resources, to a set of time and frequency resources granted for uplink
  • coding e.g., which can include adding a cyclic redundancy check (CRC) and/or coding
  • processing can comprise one or more of: identifying physical resources associated with the signal/message, detecting the signal/message, resource element group deinterleaving, demodulation, descrambling, and/or decoding.
  • the apparatus 300 could be included within the UE 104 of Fig. 1.
  • Examples can include subject matter such as a method, means for performing acts or blocks of the method, at least one machine-readable medium including instructions that, when performed by a machine cause the machine to perform acts of the method or of an apparatus or system for concurrent
  • CRS reference signal
  • DMRS DMRS antenna ports for an MTC physical downlink control channel (MPDCCH) associated with a UE, forming a CRS-to-DMRS antenna port mapping, to be
  • the UE in order to enable the UE to perform coherent demodulation of the MPDCCH, based on CRS and DMRS; generate a physical channel
  • configuration signal comprising one or more mapping information parameters indicative of the CRS-to-DMRS antenna port mapping, in order to provide
  • a radio frequency (RF) interface configured to provide, to a radio frequency (RF)
  • Example 2 is an apparatus, including the subject matter of example 1 , wherein the CRS-to-DMRS antenna port mapping is configured based on one or more precoding matrices associated with a predefined codebook, and wherein the one or more mapping information parameters comprises an index parameter comprising a precoding matrix index (PMI) associated with the predefined codebook, wherein the PMI identifies a respective precoding matrix from the predefined codebook.
  • PMI precoding matrix index
  • Example 3 is an apparatus, including the subject matter of examples 1 -
  • the one or more mapping information parameters further comprises a switching pattern parameter indicative of a PMI switching pattern based on which the PMI associated with the predefined codebook is varied among a set of PMIs associated with the predefined codebook, as a function of frequency and/or time of the MPDCCH, respectively.
  • Example 4 is an apparatus, including the subject matter of examples 1 -
  • the one or more mapping information parameters further comprises an interval parameter indicative of intervals in frequency and/or periods in time, based on which the PMI associated with the predefined codebook is varied, in accordance with the PMI switching pattern.
  • Example 5 is an apparatus, including the subject matter of examples 1 -
  • mapping information parameters further comprises a PMI restriction parameter that restricts the PMIs within the set of PMIs associated with the predefined codebook among which the PMI is varied as a function of frequency or time, to less than all the PMIs associated with the predefined codebook.
  • Example 6 is an apparatus, including the subject matter of examples 1 -
  • the CRS-to-DMRS antenna port mapping comprises a one-to-one antenna port mapping
  • the one or more mapping information parameters comprises a mapping parameter indicative of the one-to-one antenna port mapping between the CRS antenna ports and DMRS antenna ports for the MPDCCH.
  • Example 7 is an apparatus, including the subject matter of examples 1 -
  • a precoding method associated with the MPDCCH comprises space frequency block coding (SFBC)/switched Tx diversity
  • the physical channel configuration signal further comprises a precoding parameter indicative of the (SFBC)/switched Tx diversity precoding method associated with the MPDCCH, in order to enable the UE to perform coherent demodulation of the MPDCCH based on the CRS and the DMRS.
  • Example 8 is an apparatus, including the subject matter of examples 1 -
  • the physical channel configuration signal further comprises one or more power offset parameters indicative of a power offset between the CRS antenna ports and the DMRS antenna ports of the MPDCCH.
  • Example 9 is an apparatus, including the subject matter of examples 1 -
  • the CRS-to-DMRS antenna port mapping comprises a first mapping between the CRS antenna ports and the DMRS antenna ports configured for common search space (CSS) of the
  • MPDCCH and a second mapping between the CRS antenna ports and the DMRS antenna ports configured for UE-specific search spaces (UESS) of the MPDCCH.
  • UESS UE-specific search spaces
  • Example 10 is an apparatus, including the subject matter of examples 1 -9, including or omitting elements, wherein the physical channel configuration signal comprises a common physical channel configuration signal comprising one or more mapping information parameters indicative of the first mapping for the CSS of the MPDCCH, and a UE-specific physical channel configuration signal comprising one or more mapping information parameters indicative of the second mapping for the UESS of the MPDCCH.
  • Example 1 1 is an apparatus, including the subject matter of examples 1 -10, including or omitting elements, wherein the first mapping for the CSS of the MPDCCH comprises one or more mapping configured for one or more CSS types, respectively, associated with the MPDCCH.
  • Example 12 is an apparatus, including the subject matter of examples 1 -1 1 , including or omitting elements, wherein the CRS-to-DMRS antenna port mapping is configured as a function of narrowband associated therewith.
  • Example 13 is an apparatus, including the subject matter of examples 1 -12, including or omitting elements, wherein the CRS-to-DMRS antenna port mapping is configured as a function of a coverage enhancement (CE) mode in which the MDPCCH is monitored for a given search space associated therewith.
  • CE coverage enhancement
  • Example 14 is an apparatus, including the subject matter of examples 1 -13, including or omitting elements, wherein the CRS-to-DMRS antenna port mapping is configured as a function of radio network temporary identifier (RNTI).
  • RNTI radio network temporary identifier
  • Example 15 is an apparatus, including the subject matter of examples 1 -14, including or omitting elements, wherein the CRS-to-DMRS antenna port mapping comprises UE-specific mapping that is configured specifically for the UE, and wherein the physical channel configuration signal comprises a UE-specific signal.
  • Example 16 is an apparatus configured to be employed in a user equipment (UE) associated with a machine type communication (MTC) system, comprising one or more processors configured to process a physical channel configuration signal, received from an eNodeB associated therewith, wherein the physical channel configuration signal comprises one or more mapping information parameters indicative of a mapping between cell-specific reference signal (CRS) antenna ports and demodulation reference signals (DMRS) antenna ports for an MTC physical downlink control channel (MPDCCH) associated with a UE, forming a CRS-to-DMRS antenna port mapping; determine the CRS-to-DMRS antenna port mapping, based on processing the physical channel configuration signal; and perform coherent demodulation of the MPDCCH, based on CRS and DMRS, in accordance with the determined CRS-to-DMRS antenna port mapping.
  • CRS cell-specific reference signal
  • DMRS demodulation reference signals
  • Example 17 is an apparatus, including the subject matter of example 16, wherein the CRS-to-DMRS antenna port mapping is based on one or more precoding matrices associated with a predefined codebook, and wherein the one or more mapping information parameters comprises an index parameter comprising a precoding matrix index (PMI) associated with the predefined codebook, wherein the precoding matrix index identifies a respective precoding matrix from the predefined codebook.
  • PMI precoding matrix index
  • Example 18 is an apparatus, including the subject matter of examples 16-17, including or omitting elements, wherein, in order to enable frequency domain diversity and/or time domain diversity, the one or more mapping information parameters further comprises a switching pattern parameter indicative of a PMI switching pattern based on which the PMI associated the predefined codebook is varied among a set of PMIs associated with the predefined codebook, as a function of frequency and/or time of the MPDCCH, respectively.
  • Example 19 is an apparatus, including the subject matter of examples 16-18, including or omitting elements, wherein, when the number of CRS antenna ports and the number of DMRS antenna ports associated with the MPDCCH are equal, the CRS-to-DMRS antenna port mapping comprises a one-to-one antenna port mapping, and wherein the one or more mapping information parameters comprises a mapping parameter indicative of the one-to-one antenna port mapping between the CRS antenna ports and DMRS antenna ports for the MPDCCH.
  • Example 20 is an apparatus, including the subject matter of examples 16-19, including or omitting elements, wherein a precoding method associated with the MPDCCH comprises space frequency block coding (SFBC)/switched Tx diversity, and wherein the physical channel configuration signal further comprises a precoding parameter indicative of the (SFBC)/switched Tx diversity precoding method associated with the MPDCCH, in order to enable the UE to perform coherent demodulation of the MPDCCH based on the CRS and the DMRS.
  • SFBC space frequency block coding
  • the physical channel configuration signal further comprises a precoding parameter indicative of the (SFBC)/switched Tx diversity precoding method associated with the MPDCCH, in order to enable the UE to perform coherent demodulation of the MPDCCH based on the CRS and the DMRS.
  • Example 21 is an apparatus, including the subject matter of examples 16-20, including or omitting elements, wherein the physical channel configuration signal further comprises one or more power offset parameters indicative of a power offset between the CRS antenna ports and the DMRS antenna ports associated with the MPDCCH.
  • Example 22 is an apparatus, including the subject matter of examples 16-21 , including or omitting elements, wherein the one or more processors is further configured to provide a UE capability signal comprising an indication regarding a capability of the UE to perform coherent demodulation of the
  • MPDCCH jointly based on the CRS and the DMRS, to the eNodeB, via a radio frequency (RF) circuitry, prior to processing the physical channel configuration signal.
  • RF radio frequency
  • Example 23 is a computer readable storage device storing executable instructions that, in response to execution, cause one or more processors of an eNodeB to perform operations, the operations comprising configuring a mapping between cell-specific reference signal (CRS) antenna ports and demodulation reference signals (DMRS) antenna ports for an MTC physical downlink control channel (MPDCCH) associated with a UE, forming a CRS-to-DMRS antenna port mapping, to be provided to the UE, in order to enable the UE to perform coherent demodulation of the MPDCCH based on CRS and DMRS; generating a physical channel configuration signal comprising one or more mapping information parameters indicative of the CRS-to-DMRS antenna port mapping, in order to provide information on the CRS-to-DMRS antenna port mapping to the UE; and providing the physical channel configuration signal, to a radio frequency (RF) circuitry, for subsequent transmission to the UE.
  • CRS cell-specific reference signal
  • DMRS demodulation reference signals
  • Example 24 is a computer readable storage device, including the subject matter of example 23, wherein the CRS-to-DMRS antenna port mapping is configured based on one or more precoding matrices associated with a predefined codebook, and wherein the one or more mapping information parameters comprises an index parameter comprising a precoding matrix index (PMI) associated with the predefined codebook, wherein the PMI identifies a precoding matrix index (PMI)
  • Example 25 is a computer readable storage device, including the
  • examples 23-24 including or omitting elements, wherein, when the number of CRS antenna ports and the number of DMRS antenna ports
  • mapping comprises a one-to-one antenna port mapping
  • the one or more mapping information parameters comprises a mapping parameter indicative of the one-to-one antenna port mapping between the CRS antenna ports

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Abstract

Cette invention concerne un appareil configuré pour être employé dans un eNode B associé à un système de communication de type machine (MTC). L'appareil comprend un ou plusieurs processeurs configurés pour configurer un mappage entre des ports d'antenne de signal de référence spécifique à une cellule (CRS) et des ports d'antenne de signaux de référence de démodulation (DMRS) pour un canal de commande de liaison descendante physique de système MTC (MPDCCH) associé à un EU, former un mappage de port d'antenne CRS à DMRS à fournir à l'EU, afin de permettre à l'EU d'effectuer une démodulation cohérente du du canal MPDCCH, à base de signaux CRS et DMRS. Le(s) processeur(s) est/sont en outre configuré(s) pour générer un signal de configuration de canal physique comprenant un ou plusieurs paramètres d'informations de mappage indiquant le mappage de port d'antenne CRS à DMRS, afin de fournir des informations sur le mappage de port d'antenne CRS à DMRS à l'EU.
EP19847984.2A 2018-08-10 2019-08-08 Activation de signaux de référence spécifiques à une cellule (crs) pour une amélioration de performance de canal de commande de liaison descendante physique de communication de type machine (mpdcch) Withdrawn EP3834358A4 (fr)

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US201862717661P 2018-08-10 2018-08-10
PCT/US2019/045617 WO2020033621A1 (fr) 2018-08-10 2019-08-08 Activation de signaux de référence spécifiques à une cellule (crs) pour une amélioration de performance de canal de commande de liaison descendante physique de communication de type machine (mpdcch)

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EP19847984.2A Withdrawn EP3834358A4 (fr) 2018-08-10 2019-08-08 Activation de signaux de référence spécifiques à une cellule (crs) pour une amélioration de performance de canal de commande de liaison descendante physique de communication de type machine (mpdcch)

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CN107257275B (zh) * 2012-01-27 2021-03-16 交互数字专利控股公司 由WTRU执行的用于ePDCCH的方法、WTRU、搜索空间监视方法和UE
US9596061B2 (en) 2014-02-10 2017-03-14 Telefonaktiebolaget Lm Ericsson (Publ) Reference signal coupling in a wireless network
JP2017526197A (ja) * 2014-06-27 2017-09-07 インテル アイピー コーポレーション 狭帯域を利用したＭＴＣのためのｅＮＢおよびＵＥの方法および装置
EP3200412B1 (fr) * 2014-09-24 2020-11-04 LG Electronics Inc. Procédé et dispositif sans fil permettant de recevoir un canal de commande de liaison descendante
US11637593B2 (en) * 2015-07-09 2023-04-25 Qualcomm Incorporated Machine type communication (MTC) configuration, interference management, and retuning time for uplink transmissions
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EP4362406A2 (fr) 2024-05-01
WO2020033621A1 (fr) 2020-02-13
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CN112514301A (zh) 2021-03-16
EP3834358A4 (fr) 2022-05-18

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