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WO2020055075A1 - Procédé et dispositif de transmission et de réception de signaux dans une bande sans licence - Google Patents

Procédé et dispositif de transmission et de réception de signaux dans une bande sans licence Download PDF

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Publication number
WO2020055075A1
WO2020055075A1 PCT/KR2019/011663 KR2019011663W WO2020055075A1 WO 2020055075 A1 WO2020055075 A1 WO 2020055075A1 KR 2019011663 W KR2019011663 W KR 2019011663W WO 2020055075 A1 WO2020055075 A1 WO 2020055075A1
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WO
WIPO (PCT)
Prior art keywords
information
slot
cot
coreset
pdcch monitoring
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/KR2019/011663
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English (en)
Korean (ko)
Inventor
정회윤
박성익
김흥묵
허남호
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.)
Electronics and Telecommunications Research Institute ETRI
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Electronics and Telecommunications Research Institute ETRI
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Filing date
Publication date
Priority claimed from KR1020190109839A external-priority patent/KR102836757B1/ko
Application filed by Electronics and Telecommunications Research Institute ETRI filed Critical Electronics and Telecommunications Research Institute ETRI
Publication of WO2020055075A1 publication Critical patent/WO2020055075A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B17/00—Monitoring; Testing
    • H04B17/30—Monitoring; Testing of propagation channels
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B17/00—Monitoring; Testing
    • H04B17/30—Monitoring; Testing of propagation channels
    • H04B17/382—Monitoring; Testing of propagation channels for resource allocation, admission control or handover
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/24—Radio transmission systems, i.e. using radiation field for communication between two or more posts
    • H04B7/26—Radio transmission systems, i.e. using radiation field for communication between two or more posts at least one of which is mobile
    • 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
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/26—Systems using multi-frequency codes
    • 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
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/04—Wireless resource allocation

Definitions

  • the present invention relates to a technology for transmitting and receiving signals in an unlicensed band, and more particularly, to a technology for transmitting and receiving a control channel within a channel occupancy time (COT) of an unlicensed band.
  • COT channel occupancy time
  • LTE long term evolution
  • NR new radio
  • LTE may be one of 4G (4th Generation) wireless communication technologies
  • NR may be one of 5G (5th Generation) wireless communication technologies.
  • a 4G communication system for example, a communication system supporting LTE
  • a 4G communication system as well as a frequency band of a 4G communication system (for example, a frequency band of 6 GHz or less)
  • a 5G communication system eg, a communication system supporting NR
  • the 5G communication system can support enhanced Mobile BroadBand (eMBB), Ultra-Reliable and Low Latency Communication (URLLC), and Massive Machine Type Communication (mMTC).
  • eMBB enhanced Mobile BroadBand
  • URLLC Ultra-Reliable and Low Latency Communication
  • mMTC Massive Machine Type Communication
  • the 5G communication system can operate in an unlicensed band.
  • the base station and / or the terminal may set a channel occupancy time (COT) in an unlicensed band, and may transmit and receive signals / channels within the COT.
  • the base station may transmit downlink control information in the COT, and may transmit data (eg, a physical downlink shared channel (PDSCH)) using resources scheduled by the downlink control information in the COT.
  • PDSCH physical downlink shared channel
  • a transmission location of downlink control information in a partial slot or a partial subframe for example, a physical downlink control channel (PDCCH) monitoring location
  • PDCCH physical downlink control channel
  • methods for setting the transmission location of the downlink control information in the COT will be required.
  • An object of the present invention for solving the above problems is to provide a method and apparatus for transmitting and receiving a control channel within a channel occupancy time (COT) of an unlicensed band.
  • COT channel occupancy time
  • the second configuration information of the PDCCH monitoring application is set in a slot, the partial slot includes less than n symbols, the general slot includes n symbols, and n is an integer of 2 or more.
  • the CORESET information may include information indicating whether the search space information includes the first setting information.
  • the monitoring operation may be performed when it is determined that the COT is set in the unlicensed band, and the monitoring operation may be performed within the COT.
  • each of the first setting information and the second setting information is information indicating a cycle of the PDCCH monitoring slot, information indicating an offset of the PDCCH monitoring slot, and the first monitoring operation is performed in the PDCCH monitoring slot. It may include one or more of the information indicating the first symbol (s).
  • the operation method of the terminal may further include performing communication with the base station in the unlicensed band based on the DCI obtained by the monitoring operation, wherein the DCI is based on the CORESET information and the search space information. It may include information indicating activation or deactivation of the PDCCH monitoring location set by.
  • the DCI may further include COT setting information, and the COT setting information may be selected from among information indicating the start point of the COT, information indicating the length of the COT, and information indicating the end point of the COT. It may include one or more.
  • the monitoring operation is performed in the PDCCH monitoring location indicated by the CORESET information and the first setting information in the starting slot in the COT. You can.
  • the operation method of the terminal may further include performing the monitoring operation in the PDCCH monitoring location indicated by the CORESET information and the second setting information in a slot after the start slot.
  • the monitoring operation may be performed in the PDCCH monitoring application indicated by the CORESET information and the second setting information.
  • a method of operating a base station for achieving the above object is a step of transmitting CORESET information to a terminal, first setting information of a PDCCH monitoring application set in a partial slot, and general setting of a slot. Transmitting discovery space information including the second setting information of the PDCCH monitoring location to the terminal, and DCI through the PDCCH monitoring location indicated by the CORESET information and the discovery space information in an unlicensed band; And transmitting to the terminal, wherein the partial slot includes less than n symbols, the normal slot includes n symbols, and n is an integer of 2 or more.
  • the CORESET information may include information indicating whether the search space information includes the first setting information.
  • each of the first setting information and the second setting information is information indicating a period of a PDCCH monitoring slot, information indicating an offset of the PDCCH monitoring slot, and the PDCCH monitoring slot in the It may include one or more of information indicating the first symbol (s) on which the monitoring operation is performed.
  • the DCI may include information indicating activation or deactivation of the PDCCH monitoring application, which is set by the CORESET information and the search space information.
  • the DCI is transmitted through the PDCCH monitoring location indicated by the CORESET information and the first setting information in the start slot in the COT. You can.
  • the DCI may be transmitted through the PDCCH monitoring application indicated by the CORESET information and the second setting information.
  • the terminal for achieving the above object includes a processor and a memory storing one or more instructions executed by the processor, wherein the one or more instructions receive CORESET information from a base station, It is executed to receive the search space information associated with the CORESET information from the base station, and to perform a monitoring operation in the PDCCH monitoring application of the unlicensed band indicated by the CORESET information and the search space information, and the search space information
  • the first configuration information of the PDCCH monitoring application is set in a partial slot and the second configuration information of the PDCCH monitoring application set in a general slot, and the partial slot includes less than n symbols, and the general A slot contains n symbols, where n is an integer greater than or equal to 2 .
  • the CORESET information may include information indicating whether the search space information includes the first setting information.
  • the one or more commands may be further executed to perform communication with the base station in the unlicensed band based on the DCI obtained by the monitoring operation, wherein the DCI is set by the CORESET information and the search space information It may include information indicating activation or deactivation of the PDCCH monitoring application.
  • the monitoring operation is performed in the PDCCH monitoring location indicated by the CORESET information and the first setting information in the starting slot in the COT. You can.
  • the monitoring operation may be performed in the PDCCH monitoring application indicated by the CORESET information and the second setting information.
  • the setting of a physical downlink control channel (PDCCH) monitoring location in a start slot (for example, a partial slot) in a channel occupancy time (COT) includes the remaining slots in the COT (for example, included in the COT).
  • the base station may transmit search space information including configuration information of the PDCCH monitoring application in the start slot of the COT and configuration information of the PDCCH monitoring application in the remaining slots of the COT.
  • the terminal can receive the search space information from the base station, can check the PDCCH monitoring application in slots included in the COT based on the search space information, and perform control in the PDCCH monitoring application to control information (for example, , DCI (downlink control information) can be obtained. That is, the terminal can successfully receive control information from the COT. Therefore, the performance of the wireless communication network can be improved.
  • control information for example, , DCI (downlink control information) can be obtained. That is, the terminal can successfully receive control information from the COT. Therefore, the performance of the wireless communication network can be improved.
  • FIG. 1 is a conceptual diagram showing a first embodiment of a wireless communication network.
  • FIG. 2 is a block diagram showing a first embodiment of a communication node constituting a communication system.
  • FIG. 3 is a conceptual diagram illustrating a first embodiment of a system frame in a wireless communication network.
  • FIG. 4 is a conceptual diagram illustrating a first embodiment of a subframe in a wireless communication network.
  • FIG. 5 is a conceptual diagram illustrating a first embodiment of a slot in a wireless communication network.
  • FIG. 6 is a conceptual diagram illustrating a second embodiment of a slot in a wireless communication network.
  • FIG. 7 is a conceptual diagram illustrating a first embodiment of time-frequency resources in a wireless communication network.
  • FIG. 8 is a conceptual diagram illustrating a first embodiment of a downlink channel set in a slot in a wireless communication network.
  • FIG. 9 is a conceptual diagram illustrating a second embodiment of a downlink channel set in a slot in a wireless communication network.
  • FIG. 10 is a conceptual diagram illustrating a first embodiment of a PDCCH monitoring application in a wireless communication network.
  • FIG. 11 is a conceptual diagram illustrating a second embodiment of a PDCCH monitoring application in a wireless communication network.
  • FIG. 12 is a timing diagram showing a first embodiment of a method for transmitting a burst signal in a wireless communication network.
  • FIG. 13 is a timing diagram showing a second embodiment of a method for transmitting a burst signal in a wireless communication network.
  • FIG. 14 is a timing diagram illustrating a third embodiment of a method for transmitting a burst signal in a wireless communication network.
  • 15 is a flowchart illustrating a first embodiment of a method for monitoring PDCCH in a wireless communication network.
  • 16 is a flowchart illustrating a first embodiment of a method for receiving a burst signal in a wireless communication network.
  • first and second may be used to describe various components, but the components should not be limited by the terms. The terms are used only for the purpose of distinguishing one component from other components.
  • first component may be referred to as a second component without departing from the scope of the present invention, and similarly, the second component may be referred to as a first component.
  • a wireless communication network to which embodiments according to the present invention are applied will be described.
  • the wireless communication network to which the embodiments according to the present invention are applied is not limited to the contents described below, and the embodiments according to the present invention can be applied to various wireless communication networks.
  • the wireless communication network may be used in the same sense as the wireless communication system.
  • FIG. 1 is a conceptual diagram showing a first embodiment of a wireless communication network.
  • the first base station 110 is a cellular (cellular) communication (e.g., 3GPP (3rd generation partnership project) standard defined in LTE (long term evolution), LTE-A (advanced), LTE- A Pro, LTE-U (unlicensed), NR (new radio), NR-U (unlicensed) can be supported, etc.
  • the first base station 110 is a multiple input multiple output (MIMO) (eg, single (SU) user) -MIMO, multi-user (MU) -MIMO, massive MIMO, etc., coordinated multipoint (CoMP), carrier aggregation (CA), and the like.
  • MIMO multiple input multiple output
  • MU multi-user
  • CA carrier aggregation
  • the first base station can operate at a frequency F1 and form a macro cell.
  • the first base station 110 may be connected to other base stations (eg, the second base station 120 and the third base station 130) through an idle backhaul or a non-idle backhaul.
  • the second base station 120 may be located within the coverage of the first base station 110.
  • the second base station 120 may operate at a frequency F2 and may form a small cell.
  • the second base station 120 may support a different communication method (eg, NR) from the first base station 110.
  • a different communication method eg, NR
  • the third base station 130 may be located within the coverage of the first base station 110.
  • the third base station 130 may operate at a frequency F2 and form a small cell.
  • the third base station 120 may support a different communication method (eg, NR) from the first base station 110.
  • a terminal connected to the first base station 110 may transmit / receive a signal / channel with the first base station 110 through a carrier aggregation (CA) between the frequency (F1) and the frequency (F2).
  • a terminal supporting dual connectivity (DC) may be connected to the first base station 110 and the second base station 120, and may transmit and receive signals / channels with the first base station 110 using a frequency F1. , It is possible to transmit and receive signals / channels with the second base station 120 using the frequency F2.
  • the communication nodes constituting the aforementioned wireless communication network are based on a code division multiple access (CDMA) communication protocol, a wideband CDMA (WCDMA) based communication protocol, and a time division multiple access (TDMA) based.
  • CDMA code division multiple access
  • WCDMA wideband CDMA
  • TDMA time division multiple access
  • Communication protocol FDMA (frequency division multiple access) based communication protocol
  • SC single carrier
  • OFDM orthogonal frequency division multiplexing
  • OFDMA orthogonal frequency division multiple access
  • the base station is a NodeB (NodeB), an advanced NodeB (evolved NodeB), a 5g NodeB (gNodeB), a base transceiver station (BTS), a radio base station, a radio transceiver, and an access point.
  • a terminal is a user equipment (UE), an access terminal, a mobile terminal, a station, a subscriber station, a portable subscriber station, and a mobile. It may be referred to as a mobile station, a node, or a device.
  • the communication node may have the following structure.
  • FIG. 2 is a block diagram showing a first embodiment of a communication node constituting a communication system.
  • the communication node 200 may include at least one processor 210, a memory 220, and a transceiver 230 connected to a network to perform communication.
  • the communication node 200 may further include an input interface device 240, an output interface device 250, and a storage device 260.
  • Each component included in the communication node 200 may be connected by a bus 270 to communicate with each other.
  • each component included in the communication node 200 may be connected via a separate interface or a separate bus centered on the processor 210, rather than the common bus 270.
  • the processor 210 may be connected to at least one of the memory 220, the transceiver 230, the input interface device 240, the output interface device 250, and the storage device 260 through a dedicated interface. .
  • the processor 210 may execute a program command stored in at least one of the memory 220 and the storage device 260.
  • the processor 210 may mean a central processing unit (CPU), a graphics processing unit (GPU), or a dedicated processor in which methods according to embodiments of the present invention are performed.
  • Each of the memory 220 and the storage device 260 may be configured as at least one of a volatile storage medium and a non-volatile storage medium.
  • the memory 220 may be configured as at least one of read only memory (ROM) and random access memory (RAM).
  • the corresponding second communication node corresponds to a method performed in the first communication node (eg For example, signal reception or transmission) may be performed. That is, when the operation of the terminal is described, the corresponding base station may perform an operation corresponding to the operation of the terminal. Conversely, when the operation of the base station is described, the corresponding terminal may perform an operation corresponding to the operation of the base station.
  • FIG. 3 is a conceptual diagram illustrating a first embodiment of a system frame in a wireless communication network.
  • time resources in a wireless communication network may be classified in units of frames.
  • system frames may be continuously set in a time axis of a wireless communication network.
  • the length of the system frame may be 10 milliseconds (ms).
  • the system frame number (SFN) may be set to # 0 to # 1023.
  • 1024 system frames may be repeated on the time axis of the wireless communication network.
  • the SFN of the system frame after system frame # 1023 may be # 0.
  • One system frame may include two half frames.
  • the length of one half frame may be 5 ms.
  • the half frame located in the start region of the system frame may be referred to as “half frame # 0”, and the half frame positioned in the end region of the system frame may be referred to as “half frame # 1”.
  • the system frame may include 10 subframes.
  • the length of one subframe may be 1 ms.
  • Ten subframes in one system frame may be referred to as "subframe # 0-9".
  • FIG. 4 is a conceptual diagram illustrating a first embodiment of a subframe in a wireless communication network.
  • one subframe may include n slots, and n may be a natural number. Therefore, one subframe may be composed of one or more slots.
  • FIG. 5 is a conceptual diagram illustrating a first embodiment of a slot in a wireless communication network
  • FIG. 6 is a conceptual diagram illustrating a second embodiment of a slot in a wireless communication network.
  • one slot may include one or more symbols.
  • One slot illustrated in FIG. 5 may include 14 symbols.
  • One slot illustrated in FIG. 6 may include 7 symbols.
  • the length of the slot may vary depending on the number of symbols included in the slot and the length of the symbol. Alternatively, the length of the slot may vary depending on numerology.
  • the length of the slot may be 1 ms.
  • one system frame may include 10 slots.
  • the length of the slot may be 0.5 ms.
  • one system frame may include 20 slots.
  • the length of the slot may be 0.25 ms.
  • one system frame may include 40 slots.
  • the length of the slot may be 0.125 ms.
  • one system frame may include 80 slots.
  • the length of the slot may be 0.0625 ms.
  • one system frame may include 160 slots.
  • the symbol may be configured as a downlink (DL) symbol, a flexible symbol, or an uplink (UL) symbol.
  • a slot composed only of the DL symbol may be referred to as a “DL slot”
  • a slot composed only of the FL symbol may be referred to as a “FL slot”
  • a slot composed only of the UL symbol may be referred to as a “UL slot”.
  • FIG. 7 is a conceptual diagram illustrating a first embodiment of time-frequency resources in a wireless communication network.
  • a resource composed of one OFDM symbol in the time axis and one subcarrier in the frequency axis may be defined as a “re (resource element)”.
  • Resources composed of one OFDM symbol in the time axis and K subcarriers in the frequency axis may be defined as a "resource element group (REG)".
  • the REG may include K REs.
  • REG can be used as a basic unit of resource allocation in the frequency axis.
  • K can be a natural number.
  • N may be a natural number.
  • N OFDM symbols can be used as a basic unit of resource allocation in the time axis.
  • downlink data may be transmitted through a physical downlink shared channel (PDSCH).
  • PDSCH may mean downlink data.
  • the base station may transmit downlink control information (DCI) including configuration information of the PDSCH through a physical downlink control channel (PDCCH).
  • DCI downlink control information
  • PDCCH may mean DCI (eg, control information).
  • the UE may receive DCI through the PDCCH, and check configuration information of the PDSCH included in the DCI.
  • the PDSCH configuration information may include information indicating a PDSCH region on a time axis, information indicating a PDSCH region on a frequency axis, and / or modulation and coding scheme (MCS).
  • MCS modulation and coding scheme
  • FIG. 8 is a conceptual diagram illustrating a first embodiment of a downlink channel set in a slot in a wireless communication network.
  • one slot may include 14 symbols on the time axis.
  • some symbol (s) may be set as a PDCCH region, and the remaining symbols may be set as a PDSCH region.
  • symbol # 0-1 may be set as a PDCCH region
  • symbol # 2-13 may be set as a PDCCH region.
  • the PDCCH region may be set from the start of the slot, and a PDSCH region may be set after the PDCCH region in the slot.
  • This mapping type may be referred to as "PDSCH mapping type A".
  • PDSCH mapping type A the position of a demodulation reference signal (DMRS) in the time axis may be defined based on the first symbol (eg, symbol # 0) of the slot. For example, when the symbol offset of the DMRS is 2, the DMRS may be placed in symbol # 2 in the slot.
  • DMRS demodulation reference signal
  • FIG. 9 is a conceptual diagram illustrating a second embodiment of a downlink channel set in a slot in a wireless communication network.
  • one slot may include 14 OFDM symbols in the time axis.
  • the PDCCH region may be set in any symbol (s) in the slot, and the PDSCH region may be set in the slot after the PDCCH region.
  • symbol # 7-8 may be set as a PDCCH region
  • symbol # 9-13 may be set as a PDSCH region.
  • This mapping type may be referred to as "PDSCH mapping type B".
  • the position of the DMRS in the time axis may be defined based on the first symbol (for example, symbol # 9) in which the PDSCH is set. For example, when the symbol offset of the DMRS is 2, the DMRS may be placed in symbol # 11 in the slot.
  • the UE may perform a PDCCH monitoring operation to receive DCI including scheduling information of PDSCH.
  • Configuration information for PDCCH monitoring may be transmitted from a base station to a terminal through an upper layer message (for example, a radio resource control (RRC) message).
  • RRC radio resource control
  • Configuration information for PDCCH monitoring may be included in control resource set (CORESET) information and / or search space information.
  • CORESET control resource set
  • CORESET information may include one or more of the following parameters.
  • CORESET e.g., search space
  • -pdcch-DMRS-ScramblingID for example, DMRS information for PDCCH demodulation
  • the frequency resource information of the CORESET (for example, frequency resource information where a PDCCH can exist) may be set in n RB units.
  • n can be a natural number.
  • n can be 6.
  • the time resource information of CORESET (for example, time resource information where PDCCH can exist) may be set in units of m symbols.
  • m can be a natural number.
  • m can be 1, 2, or 3.
  • the search space information may include one or more of the following parameters.
  • searchSpaceId for example, search space ID
  • controlResourceSetId e.g. CORESET ID associated with the search space
  • -monitoringSymbolsWithinSlot (for example, the first symbol (s) in which PDCCH monitoring is performed in a slot, and the corresponding symbol (s) can be indicated in the form of a bitmap)
  • -nrofCandidates e.g., number of PDCCH candidates by aggregation level
  • -searchSpaceType e.g., CSS (common search space), USS (UE-specific search space), DCI format to be monitored)
  • the UE can receive the CORESET information and the search space information from the base station, can check the PDCCH monitoring occupancy based on the CORESET information and the search space information, and can perform a monitoring operation in the PDCCH monitoring application.
  • the PDCCH monitoring location can be set as follows.
  • FIG. 10 is a conceptual diagram illustrating a first embodiment of a PDCCH monitoring application in a wireless communication network.
  • the length of the PDCCH monitoring application on the time axis may be indicated by CORESET information (eg, duration).
  • the length of the PDCCH monitoring application may be indicated in units of symbols.
  • the length of the PDCCH monitoring application may be 2 symbols.
  • symbol # 0-1 may be a PDCCH monitoring application
  • the period of the PDCCH monitoring application slot may be one slot.
  • the offset of the PDCCH monitoring location slot may be 0.
  • the terminal may check the PDCCH monitoring location using the search space information and the CORESET information associated with the search space information (for example, CORESET information mapped to a CORESET ID included in the search space information). For example, the terminal may check the start symbol (for example, symbol # 0) of the PDCCH monitoring application in the slot based on the "monitoringSlotPeriodicityAndOffset" and "monitoringSymbolsWithinSlot” included in the search space information, and the search space information Based on the "duration" included in the associated CORESET information, it is possible to check the length (eg, 2 symbols) of the PDCCH monitoring application.
  • the terminal may perform a monitoring operation (eg, blind decoding operation) in the identified PDCCH monitoring application.
  • FIG. 11 is a conceptual diagram illustrating a second embodiment of a PDCCH monitoring application in a wireless communication network.
  • a plurality of CORESETs (eg, CORESET # 0-1) and a plurality of search spaces (eg, search space # 0-3) may be set.
  • the base station may transmit the CORESET # 0 information and the CORESET # 1 information to the terminal, and may transmit the search space # 0 information, the search space # 1 information, and the search space # 2 information to the terminal.
  • the terminal may receive the CORESET # 0-1 information and the search space # 0-2 information from the base station, and may identify the PDCCH monitoring application based on the CORESET # 0-1 information and the search space # 0-2 information.
  • Search space # 0 may be associated with CORESET # 0.
  • the length of the PDCCH monitoring location # 0 on the time axis may be 1 symbol
  • the starting symbol of the PDCCH monitoring location # 0 may be the symbol # 7, and the PDCCH.
  • the period of monitoring location # 0 may be 1 slot
  • the offset of PDCCH monitoring location # 0 may be 0.
  • the UE may perform a monitoring operation (eg, blind decoding operation) in PDCCH monitoring location # 0 set in symbol # 7 of each slot.
  • the UE may detect DCI by performing a monitoring operation in PDCCH monitoring location # 0, and may acquire a PDSCH based on information included in DCI.
  • Search space # 1 may be associated with CORESET # 1.
  • the length of the PDCCH monitoring option # 1 on the time axis may be two symbols, and the starting symbol of the PDCCH monitoring option # 1 may be the symbol # 0,
  • the period of PDCCH monitoring location # 1 may be two slots, and the offset of PDCCH monitoring location # 1 may be zero. Therefore, the terminal may perform a monitoring operation (eg, blind decoding operation) in the PDCCH monitoring location # 1 set in symbol # 0-1 of slots # 0 and # 2.
  • the UE may detect DCI by performing a monitoring operation in PDCCH monitoring location # 1, and may acquire a PDSCH based on information included in DCI.
  • Search space # 2 may be associated with CORESET # 1.
  • the length of the PDCCH monitoring option # 2 on the time axis may be two symbols, and the starting symbol of the PDCCH monitoring option # 2 may be the symbol # 4,
  • the period of PDCCH monitoring location # 2 may be two slots, and the offset of PDCCH monitoring location # 2 may be 1. Therefore, the terminal may perform a monitoring operation (eg, blind decoding operation) in the PDCCH monitoring location # 2 set in symbols # 4-5 of slots # 1 and # 3.
  • the UE may detect DCI by performing a monitoring operation in PDCCH monitoring location # 2, and may acquire a PDSCH based on information included in DCI.
  • COT channel occupancy time
  • the COT can indicate time resources, frequency resources, or time-frequency resources.
  • COT may be referred to as channel occupancy (CO) or channel occupancy resource (COR). Since time-frequency resources are shared with other communication nodes in the unlicensed band, time-frequency resources in a specific communication node can be used discontinuously. Therefore, signal / channel transmission in an unlicensed band may occur in the form of a discontinuous burst.
  • FIG. 12 is a timing diagram showing a first embodiment of a method for transmitting a burst signal in a wireless communication network.
  • time-frequency resources (eg, carrier frequency) of an unlicensed band are other networks (eg, WLAN (eg, 4G network, 5G network)) (eg, WLAN ( wireless local area network)).
  • time-frequency resources in the unlicensed band may be occupied by a burst signal transmitted and received between a base station and a terminal belonging to a cellular network.
  • the base station may set a COT based on a listen before talk (LBT) method, and may transmit an initial signal and a burst signal (eg, PDCCH, PDSCH, reference signal) within the COT.
  • the initial signal can be transmitted before COT.
  • the initial signal can be used to indicate that a burst signal is being transmitted.
  • the initial signal may be set to the same or similar to the preamble specified in IEEE 802.11.
  • the initial signal may be set to the same or similar to the synchronization signal (for example, primary synchronization signal (PSS), secondary synchronization signal (SSS)) specified in 3GPP.
  • PSS primary synchronization signal
  • SSS secondary synchronization signal
  • the length of the initial signal on the time axis may be two symbols, a PSS may be set to one of the two symbols, and an SSS may be set to the other symbols.
  • the initial signal may be set to the same or similar to a reference signal (eg, channel state information-reference signal (CSI-RS), DMRS) specified in 3GPP.
  • the initial signal may be PDCCH.
  • the terminal may perform a monitoring operation to receive a signal in an unlicensed band, and when an initial signal is detected, it may be determined that a burst signal is transmitted after the initial signal. Therefore, the terminal can receive the burst signal after the initial signal, and perform a demodulation / decoding operation on the burst signal.
  • FIG. 13 is a timing diagram showing a second embodiment of a method for transmitting a burst signal in a wireless communication network.
  • the base station can set the COT based on the LBT method, and transmit DCI and burst signals including scheduling information of burst signals (eg, PDCCH, PDSCH, and reference signals) to the UE in the COT.
  • the DCI may include COT configuration information.
  • the UE may receive a PDCCH by performing a monitoring operation in a PDCCH monitoring location set by CORESET information and search space information, and may receive a burst signal based on DCI included in the PDCCH.
  • the UE can detect the PDCCH DMRS (eg, DMRS used for demodulation of the PDCCH) in the PDCCH region, can demodulate the PDCCH based on the detected PDCCH DMRS, and based on the DCI included in the PDCCH.
  • the UE may determine that the COT is set.
  • the PDCCH region may be located in the COT.
  • the PDCCH region may be located before COT.
  • the UE can check whether a burst signal is transmitted by performing a detection operation of the PDCCH DMRS in a group-common PDCCH region.
  • the UE can check whether the burst signal is transmitted by performing the detection operation of the PDCCH DMRS in the CORESET set by the base station.
  • a DMRS used for detection of a burst signal may be set according to “precoderGranularity” included in CORESET information.
  • precoderGranularity may be set to “sameAsREG-bundle” or "allContiguousRBs”.
  • DMRS eg, PDCCH DMRS
  • the base station may transmit DMRS in all REGs in the set of consecutive RBs of CORESET.
  • the terminal may assume that the DMRS is present in all REGs in the set of consecutive RBs of the CORESET, and thus can perform the detection operation of the DMRS.
  • "precoderGranularity" of the CORESET in which the group-common PDCCH is transmitted may be set to "allContiguousRBs", in which case DMRS may be transmitted in all REGs in the set of consecutive RBs of the CORESET.
  • the UE may assume that the same precoding is used in the REG bundle.
  • the "precoderGranularity" of the CORESET where the DCI including the scheduling information of the burst signal is transmitted is set to "allContiguousRBs”
  • the UE may assume that the same precoding is used in all REGs in the set of consecutive RBs of the CORESET. . In this case, the same precoding may be used in all of the CORESETs, and terminals in the cell may receive a common DMRS.
  • the size of the PDCCH region (eg, the first PDCCH region for scheduling a burst signal) on the frequency axis may be set equal to the size of CORESET on the frequency axis.
  • "precoderGranularity" of CORESET to which the PDCCH region belongs may be set to "allContiguousRBs”. Accordingly, the UE may assume that “precoderGranularity” of the first PDCCH region for scheduling of a burst signal is set to “allContiguousRBs”, and thus perform a signal detection operation.
  • the base station may set a separate CORESET for the first PDCCH area for scheduling the burst signal, and transmit the set CORESET information to the terminal.
  • the "precoderGranularity" included in the CORESET information may be set to "allContiguousRBs".
  • the UE may receive CORESET information from the base station, and it may be assumed that the first PDCCH area for scheduling a burst signal is set based on the received CORESET information.
  • the UE can confirm that “precoderGranularity” of CORESET is set to “allContiguousRBs”, and accordingly, may perform a DMRS detection operation in the first PDCCH area for scheduling a burst signal.
  • the base station through the group-common PDCCH CO setting information for example, channel occupancy (Channel Occupancy) related information of the base station, LBT priority class (Priority Class) information used by the base station to configure the CO, and / or
  • the terminal may transmit the type of LBT to be used for UL transmission in CO.
  • the UE may receive CO configuration information on the group-common PDCCH, and perform LBT or UL transmission for uplink transmission according to information indicated by the CO configuration information.
  • the base station can secure CO through LBT.
  • the composition of CO may vary according to the type of LBT performed by the base station. For example, the maximum length of CO may vary depending on the type of LBT performed by the base station.
  • the type of LBT performed by the base station may vary according to a priority class of data to be transmitted in the CO.
  • the base station may perform LBT using different LBT parameters to obtain CO corresponding to each priority class. When performing LBT according to the priority class, parameters for determining the LBT execution time may be different. For LBTs that require a random back-off procedure, the minimum and / or maximum size of a contention window for extracting a random back-off counter is determined by each priority class. It can be set differently.
  • the base station can secure the CO by performing the LBT as described above, and can transmit the corresponding CO information (for example, CO setting information) to the terminal.
  • the CO information may include LBT parameters used by the base station to perform LBT.
  • the LBT parameter may include priority class information.
  • the UE can check the LBT parameters used for obtaining the corresponding CO by using the CO information indicated from the base station.
  • the terminal may check priority class information for the corresponding CO based on the checked LBT parameters.
  • the UE may transmit PUSCH having a priority class equal to or higher than a priority class set in the corresponding CO for PUSCH transmission in CO.
  • the UE may not perform transmission on the PUSCH having a priority class less than the priority class set in the corresponding CO for PUSCH transmission in the CO.
  • the UE may transmit the PUSCH without limitation according to the priority class set in the corresponding CO for PUSCH transmission in CO.
  • the base station may transmit information on the CO obtained through the LBT to the terminal.
  • Information about CO eg, CO setting information
  • the UE may determine whether the downlink or uplink execution section is included in the CO using the CO information.
  • the terminal may perform LBT for uplink transmission based on the determination result.
  • the base station may transmit uplink scheduling information for uplink transmission of the terminal.
  • the terminal may perform uplink transmission based on the uplink scheduling information.
  • the base station may include information related to LBT to be performed in the terminal for uplink transmission in uplink scheduling information.
  • LBT-related information may include LBT execution time information.
  • the base station may instruct the UE to perform LBT based on random backoff in order to perform uplink transmission within the corresponding CO.
  • the base station may instruct the UE to perform LBT for a fixed time period in order to perform uplink transmission in the corresponding CO.
  • the length of the fixed time period may be 16us or 25us.
  • the base station may instruct the UE to perform uplink transmission without performing a separate LBT in order to perform uplink transmission within the corresponding CO.
  • the terminal may perform LBT for uplink transmission using LBT information indicated through uplink scheduling from the base station.
  • the UE may perform uplink transmission.
  • the UE may not perform uplink transmission when the LBT result channel for uplink transmission is in a busy state.
  • the base station may transmit CO information (eg, CO setting information) to the terminal.
  • CO information may include LBT-related information to be performed for uplink transmission in CO.
  • LBT-related information may include LBT execution time information.
  • the base station may instruct the UE to perform random backoff-based LBT in order to perform uplink transmission in the CO.
  • the base station may instruct the UE to perform LBT for a fixed time period in order to perform uplink transmission in CO.
  • the length of the fixed time period may be 16us or 25us.
  • the base station may instruct the UE to perform uplink transmission without performing additional LBT in the CO.
  • the terminal receiving the CO information from the base station may perform LBT for uplink transmission using the LBT information included in the CO information.
  • the UE may perform uplink transmission.
  • the UE may not perform uplink transmission when the LBT result channel for uplink transmission is busy.
  • the base station may instruct LBT-related information for uplink transmission to the terminal through uplink scheduling.
  • the base station may indicate LBT-related information for uplink transmission to the terminal through CO information.
  • the terminal may acquire LBT-related information for uplink transmission through two methods. When the terminal acquires LBT-related information for uplink transmission through uplink scheduling, the terminal may perform LBT using the LBT-related information. When the terminal acquires LBT-related information to be performed for uplink transmission through CO information, the terminal may perform LBT using the LBT-related information.
  • the terminal may perform LBT according to the LBT-related information obtained through CO information.
  • the terminal may perform LBT using the most recently obtained LBT-related information.
  • the base station may transmit uplink scheduling information indicating that the uplink transmission is performed in the time period #m to the terminal in the time period #n before the time period #m.
  • the uplink scheduling information may include LBT-related information # 1 for uplink transmission in the time period #m by the UE.
  • the base station may transmit the CO information (eg, CO setting information) acquired by the base station to the terminal in the time interval # n + x.
  • the CO information may include LBT-related information # 2 for uplink transmission of the UE within the corresponding CO.
  • the terminal can confirm that the uplink transmission time of the terminal (eg, time interval #m) is included in the corresponding CO using the CO information received from the base station.
  • the terminal can confirm that the terminal performs LBT using LBT-related information # 2 in the corresponding CO using the CO information received from the base station.
  • the UE may update LBT information performed at the time of uplink transmission (eg, time interval #m) from LBT-related information # 1 to LBT-related information # 2.
  • the terminal may perform LBT at an uplink transmission time (eg, time interval #m) using LBT-related information # 2.
  • the base station through the group-common PDCCH COT configuration information (for example, burst signal configuration information, information indicating the start / length / end time of the COT, information indicating the slot / symbol format in the COT, and / Or PDCCH configuration information in the COT).
  • the terminal may receive the COT configuration information from the group-common PDCCH, and may perform a monitoring operation in the PDCCH monitoring location indicated by the COT configuration information.
  • the burst signal setting information may include one or more of information indicating a start time of the burst signal, information indicating a length of the burst signal, and information indicating a time point of the end of the burst signal.
  • the information indicating the length of the COT may indicate the remaining occupancy time from the transmission point of the setting information of the burst signal. For example, when the actual COT is set from time t to time t + n, and the setting information of the burst signal is transmitted at time t + k before time t + n, the information indicating the length of the COT is "nk". You can indicate the corresponding time.
  • Information indicating the slot / symbol format in the COT may indicate that the slots in the COT are DL slots, FL slots, and / or UL slots. Further, the information indicating the slot / symbol format in the COT may indicate that the symbols in the COT are DL symbols, FL symbols, and / or UL symbols. Further, the information indicating the slot / symbol format in the COT may indicate that the time period in the COT is a DL period, a FL period, and / or an UL period. In this case, the UE may perform a PDCCH monitoring operation in the DL slot, FL slot, DL symbol, FL symbol, DL period, and / or FL period in the COT. The PDCCH monitoring operation may not be performed in the UL slot, UL symbol, and UL section.
  • the base station may inform the UE whether to transmit a burst signal using DMRS and / or group-common PDCCH.
  • the UE may determine whether to transmit a burst signal by detecting DMRS and / or group-common PDCCH, and may perform a PDCCH monitoring operation based on DMRS and group-common PDCCH.
  • the UE may perform a detection operation of DMRS (eg, PDCCH DMRS) in the CORESET or group-common PDCCH region.
  • DMRS eg, PDCCH DMRS
  • the UE may perform a demodulation operation on the group-common PDCCH based on the detected DMRS.
  • the UE may acquire COT configuration information from the group-common PDCCH, and may perform a PDCCH monitoring operation based on the COT configuration information.
  • the UE may determine that the burst signal is transmitted when decoding of the group-common PDCCH is successful. For example, the UE may determine that the burst signal is transmitted when the cyclic redundancy check (CRC) of the DCI obtained through the group-common PDCCH is successful.
  • CRC cyclic redundancy check
  • the terminal may determine that the burst signal is not transmitted when the CRC of the DCI acquired through the group-common PDCCH fails.
  • the PDCCH monitoring time point of the UE performing detection of the burst signal may be limited. For example, if the PDCCH monitoring operation is set to be performed in slot #n shown in FIG. 10 by the search space information, the UE may detect a burst signal from slot # n-1. When the PDCCH monitoring operation is set to be performed in slot # n + 1 shown in FIG. 10 by the search space information, the UE may detect a burst signal from slot #n.
  • the terminal may acquire downlink synchronization and system information by receiving an SS / PBCH (synchronization signal / physical broadcast channel) block from the base station.
  • the terminal can obtain uplink synchronization by performing a random access procedure with the base station.
  • a burst signal eg, PDCCH, PDSCH, physical uplink control channel (PUCCH), physical uplink shared channel (PUSCH), reference signal
  • PDCCH physical downlink control channel
  • PUSCH physical uplink shared channel
  • FIG. 14 is a timing diagram illustrating a third embodiment of a method for transmitting a burst signal in a wireless communication network.
  • the base station can set the COT based on the LBT method and transmit a burst signal in the COT.
  • the COT can be set from symbol # 4 in slot #n to symbol # 8 in slot # n + 4.
  • the UE may be determined to have the COT set by detecting an initial signal (eg, preamble, reference signal, synchronization signal, PDCCH) in the unlicensed band, and the COT (eg, burst signal) symbol # in slot #n It can be judged as starting from 4.
  • the base station may transmit the COT configuration information including information indicating the start time of the COT, information indicating the length of the COT, and / or information indicating the end time of the COT to the terminal.
  • the UE that detects the start time of the COT can acquire COT configuration information from the base station. COT configuration information may be obtained through the PDCCH.
  • the base station may transmit the COT configuration information to terminals located in a cell or band.
  • COT configuration information may be commonly applied to terminals located in a cell or band.
  • COT configuration information may be transmitted through a UE-specific search space (USS) or a common search space (CSS).
  • USS UE-specific search space
  • CSS common search space
  • the base station may transmit DCI format 2_0 including COT configuration information to the terminal.
  • the UE may obtain DCI format 2_0 by performing a blind decoding operation in CSS, and may check COT configuration information included in DCI format 2_0.
  • the UE may perform a PDCCH monitoring operation in CSS to obtain COT configuration information.
  • the UE may detect other channels / signals (eg, PDCCH, PDSCH, DMRS) in the COT indicated by the COT configuration information.
  • the UE may detect the PDCCH in the USS after detecting the COT configuration information in the CSS.
  • the COT configuration information may include information indicating the format of the slot / symbol constituting the COT, and the UE performs a PDCCH monitoring operation in the USS set in the DL slot, DL symbol, FL slot, and / or FL symbol in the COT. can do.
  • the COT configuration information may include information indicating the COT length, and the UE may perform a PDCCH monitoring operation in the USS set in the COT.
  • the terminal may perform an initial signal detection operation after the COT end point, and when the initial signal is detected, the terminal may perform a PDCCH monitoring operation in CSS.
  • the UE may not perform the PDCCH monitoring operation in the USS until obtaining the COT configuration information.
  • the PDCCH monitoring location shown in FIG. 14 may be set in CORESET X, and “duration” included in CORESET X information may indicate two symbols.
  • “Pdcch-DMRS-ScramblingID” included in the CORESET X information may be set to K, and "precoderGranularity” included in the CORESET X information may be set to M.
  • Search space X may be associated with CORESET X. In the search space X, the PDCCH monitoring period may be set to 1 slot, and the PDCCH monitoring offset may be set to 0. The starting point of PDCCH monitoring in the search space X may be symbol # 0.
  • the UE may receive the CORESET X information and the search space X information, and perform a PDCCH monitoring operation in symbols # 0-1 of slots # n + 1 to # n + 4 based on the CORESET X information and the search space X information.
  • the terminal may detect DMRS based on K and M, and perform a PDCCH monitoring operation based on the detected DMRS.
  • the PDCCH monitoring operation may be performed in a section in which a burst signal does not exist (for example, a section outside the COT).
  • the actual PDCCH may be transmitted in symbols # 4 to # 13 of slot #n, but the PDCCH may not be detected in the terminal because the UE does not perform the PDCCH monitoring operation in symbols # 4 to # 13 of slot #n. have.
  • the UE may determine that the COT is set when the initial signal is detected, and may perform a PDCCH monitoring operation based on the CORESET information and search space information obtained from the base station when the start point of the COT coincides with the slot boundary. have.
  • the UE may determine that the first slot of the COT is a partial slot.
  • a partial slot may contain less than 14 symbols. For example, since the first slot of the COT shown in FIG. 14 includes 10 symbols, the terminal may determine that the first slot of the COT is a partial slot.
  • the UE may perform a separate PDCCH monitoring operation in the partial slot.
  • the base station may set separate CORESET Y1 and search space Y1 for PDCCH monitoring in the partial slot, and may transmit CORESET Y1 information and search space Y1 information to the terminal.
  • the UE may obtain CORESET Y1 information and search space Y1 information from the base station, and may perform a PDCCH monitoring operation based on CORESET Y1 information and search space Y1 information in a partial slot.
  • the specific CORESET ID may indicate CORESET Y1 set for PDCCH monitoring in the partial slot
  • the specific search space ID may indicate search space Y1 set for PDCCH monitoring in the partial slot.
  • the UE may perform a PDCCH monitoring operation using CORESET Y1 information corresponding to a specific CORESET ID and search space Y1 information corresponding to a specific search space ID.
  • CORESET Y1 may further include information indicating that it is a CORESET used for PDCCH monitoring in a partial slot.
  • the search space Y1 may further include information indicating that it is a search space used for PDCCH monitoring in a partial slot.
  • the terminal may acquire CORESET Y1 information and search space Y1 information from the base station.
  • the terminal may determine that the corresponding CORESET Y1 is a CORESET used for PDCCH monitoring in a partial slot based on the information included in the CORESET Y1 information.
  • the terminal may determine that the corresponding search space Y1 is a search space used for PDCCH monitoring in a partial slot based on information included in the search space Y1 information. Therefore, the UE can perform the PDCCH monitoring operation in the partial slot using the CORESET Y1 information and the search space Y1 information.
  • CORESET Y1 information for PDCCH monitoring and discovery space Y1 information may be used in a partial slot.
  • the UE may detect the start time point of the burst signal (eg, COT) by detecting the initial signal (eg, preamble, reference signal, and PDCCH).
  • the start point of the burst signal eg, COT
  • the UE may not use CORESET Y1 information and search space Y1 information.
  • the terminal may ignore the CORESET Y1 information and the search space Y1 information, and the CORESET Y1 and the search space Y1 may be deactivated.
  • the UE may perform a PDCCH monitoring operation using CORESET information for PDCCH monitoring and search space information in a normal slot (for example, a slot including 14 symbols).
  • the UE may perform a PDCCH monitoring operation using CORESET information for PDCCH monitoring and search space information in a common slot instead of CORESET Y1 information and search space Y1 information.
  • the UE performs a PDCCH monitoring operation using CORESET Y1 information and search space Y1 information in the start slot (for example, partial slot) of COT. can do.
  • the PDCCH monitoring operation using the CORESET Y1 information and the search space Y1 information may be performed until the end point of the start slot of the COT (eg, symbol # 13).
  • CORESET Y1 and search space Y1 may be activated.
  • the UE may ignore the CORESET information and the search space information for monitoring the PDCCH in the normal slot, and the CORESET and the search space for monitoring PDCCH in the normal slot may be deactivated.
  • the UE may perform a PDCCH monitoring operation using CORESET information and PSPCH monitoring information for PDCCH monitoring in a normal slot.
  • the terminal may ignore the CORESET Y1 information and the search space Y1 information in the slot (s) after the partial slot (for example, the start slot) of the COT, and the CORESET Y1 and the search space Y1 may be deactivated.
  • the CORESET Y1 information may not include “pdcch-DMRS-ScramblingID”.
  • a cell ID may be used for scrambling initialization of the PDCCH DMRS in CORESET Y1.
  • the "precoderGranularity" included in the CORESET Y1 information can be set to "allContiguousRBs".
  • the "frequencyDomainResources" included in the CORESET Y1 information may indicate a carrier bandwidth or a bandwidth part to which a burst signal is transmitted.
  • the size of CORESET Y1 on the frequency axis may be 20 MHz or less.
  • the "duration" included in the CORESET Y1 information may indicate 1, 2, or 3 symbols.
  • the length of the PDCCH monitoring application (eg, CORESET Y) in the partial slot may be determined according to the start time or length of the partial slot regardless of “duration” included in the CORESET Y1 information. For example, if the start time of the partial slot is before symbol # 7, the UE may estimate the length of CORESET Y1 on the time axis as k symbols. If the start time of the partial slot is after symbol # 7 or symbol # 7, the UE may estimate the length of CORESET Y1 on the time axis as j symbols. Each of k and j may be natural numbers.
  • the period of the PDCCH monitoring slot for the search space Y1 may be set to 1 slot, and the offset of the PDCCH monitoring slot for the search space Y1 may be set to 0.
  • the PDCCH monitoring slot may be a slot in which the PDCCH monitoring application is located.
  • the start point of PDCCH monitoring in search space Y1 may be symbol # 0.
  • the UE may perform a PDCCH monitoring operation from the first symbol in the first slot of the COT regardless of the start time of PDCCH monitoring indicated by the search space Y1 information.
  • the UE may perform a PDCCH monitoring operation in the partial slot using predefined parameters instead of separate CORESET Y1 and search space Y1.
  • the predefined parameters may be set to the same or similar to CORESET Y1 information and search space Y1 information.
  • the predefined parameters may include information indicating symbol (s) on which PDCCH monitoring is performed in a partial slot.
  • the UE may perform a PDCCH monitoring operation on all symbols belonging to the partial slot using predefined parameters. Since the first slot (for example, a partial slot) of the COT shown in FIG. 14 includes symbol # 4-13, the UE may perform a PDCCH monitoring operation in symbol # 4-13 of slot #n. When one, two, or three symbol (s) among symbols # 4-13 of slot #n is set as a PDCCH monitoring application, a blind decoding operation may be performed in each of the PDCCH monitoring applications. Here, symbol # 13 of slot #n may not be included in the PDCCH monitoring application.
  • the second PDCCH monitoring application in the partial slot may be preset, indicating the location of the second PDCCH monitoring application Information may be transmitted from the base station to the terminal.
  • the UE may perform a PDCCH monitoring operation in the preset symbol # 9.
  • a relationship eg, offset
  • the offset between PDCCH monitoring applications in a partial slot of the COT may be transmitted from the base station to the terminal.
  • the UE may perform a monitoring operation in the second PDCCH monitoring application in the partial slot using CORESET information and search space information including configuration information of the first PDCCH monitoring application in the partial slot.
  • the UE performs a second PDCCH monitoring operation on a preset symbol in a partial slot regardless of some information (for example, a period of the PDCCH monitoring slot, an offset of the PDCCH monitoring slot, and a PDCCH monitoring start point) among CORESET information and search space information. Can be done.
  • CORESET Y2 and search space Y2 for monitoring the second PDCCH in the partial slot may be set.
  • CORESET Y2 information and search space Y2 information may be transmitted from a base station to a terminal.
  • the number of symbols indicated by "duration" included in the CORESET Y2 information may be equal to or less than the number of symbols indicated by "duration” included in the CORESET Y1 information.
  • the UE performs a second PDCCH monitoring operation on a preset symbol (s) in a partial slot regardless of some information among search space Y2 information (for example, a period of a PDCCH monitoring slot, an offset of a PDCCH monitoring slot, and a PDCCH monitoring start point) You can do Alternatively, the terminal may perform a second PDCCH monitoring operation in the partial slot based on the CORESET Y2 information and the search space Y2 information.
  • CORESET Y2 information may include "precoderGranularity" and "pdcch-DMRS-ScramblingID".
  • Different CORESETs may be set for each of the terminals, and each of the terminals may perform a PDCCH monitoring operation based on CORESET and a search space associated with the corresponding CORESET.
  • the terminal is the second in the predetermined symbol (s) within the partial slot regardless of some information among the search space Y2 information (for example, the period of the PDCCH monitoring slot, the offset of the PDCCH monitoring slot, and the starting point of PDCCH monitoring).
  • a PDCCH monitoring operation can be performed.
  • the UE uses the information included in the DCI to perform a second PDCCH monitoring symbol in the partial slot ( Position).
  • the UE may determine the location of the symbol (s) on which the next PDCCH monitoring is performed using the time resource allocation information of the PDSCH included in the DCI. For example, in the embodiment illustrated in FIG. 14, the UE may detect DCI by performing PDCCH monitoring on symbol # 4 of slot #n, and time resource allocation information included in the DCI is a symbol of slot #n In the case of indicating # 5-8, symbol (s) on which the next PDCCH monitoring is performed may be determined as symbol # 9 in slot #n. In this case, the UE may perform a second PDCCH monitoring operation in symbol # 9 of slot #n.
  • the UE may perform a second PDCCH monitoring operation in the partial slot using CORESET Y1 information and discovery space Y1 information set for monitoring the first PDCCH in the partial slot.
  • the UE is included in the DCI detected by the first PDCCH monitoring operation regardless of some information among the search space Y1 information (for example, the period of the PDCCH monitoring slot, the offset of the PDCCH monitoring slot, and the starting point of the PDCCH monitoring).
  • a second PDCCH monitoring operation may be performed on the symbol (s) determined based on the allocated time resource allocation information.
  • separate CORESET Y2 and search space Y2 for monitoring the second PDCCH in the partial slot may be set.
  • the UE is a time resource included in the DCI detected by the first PDCCH monitoring operation regardless of some information among the search space Y2 information (for example, the period of the PDCCH monitoring slot, the offset of the PDCCH monitoring slot, and the start time of the PDCCH monitoring).
  • a second PDCCH monitoring operation may be performed on the symbol (s) determined based on the allocation information.
  • the CORESET and the search space for monitoring the second PDCCH in the partial slot may be independently set for each of the UEs, and the UE may perform the second PDCCH monitoring operation in the partial slot using the independently set CORESET and search space.
  • CORESET information may include individual "precoderGranularity" and "pdcch-DMRS-ScramblingID".
  • the UE is included in the DCI detected by the first PDCCH monitoring operation regardless of some information (eg, the period of the PDCCH monitoring slot, the offset of the PDCCH monitoring slot, and the start time of the PDCCH monitoring) among independently set search space information.
  • a second PDCCH monitoring operation may be performed on the symbol (s) determined based on the time resource allocation information.
  • the UE may not perform an additional PDCCH monitoring operation in the partial slot. In this case, the UE may perform the PDCCH monitoring operation in the next slot of the partial slot. For example, when DCI detection fails in symbol # 4 in slot #n of the COT shown in FIG. 14 (eg, a PDCCH monitoring application), the UE may not perform an additional PDCCH monitoring operation in slot #n. have. In this case, the UE may perform a PDCCH monitoring operation using CORESET information and search space information in slot # n + 1.
  • the UE may assume that one PDCCH monitoring application exists in a partial slot of the COT. In this case, the UE can perform monitoring in one PDCCH monitoring application in a partial slot of the COT.
  • the UE may not perform an additional PDCCH monitoring operation in the partial slot of the COT.
  • the UE may not perform an additional PDCCH monitoring operation in the partial slot of the COT.
  • the UE may perform a PDCCH monitoring operation in the remaining slot (s) after the start slot (eg, partial slot) of the COT.
  • the PDCCH monitoring operation may be performed based on the CORESET X information and the search space X information for PDCCH monitoring in the normal slot.
  • the PDCCH monitoring operation may be performed until the end point of the COT (eg, burst signal) (eg, a slot including the end point).
  • the terminal may check the end point of the COT (eg, burst signal) based on the COT setting information obtained from the base station. After the end of the COT (eg, burst signal), the UE may not perform the PDCCH monitoring operation.
  • the UE may perform a burst signal (eg, COT) detection operation instead of the PDCCH monitoring operation.
  • the terminal may detect a burst signal (eg, COT) by receiving an initial signal (eg, preamble, reference signal, PDCCH) from the base station.
  • the initial signal PDCCH may be a PDCCH obtained from CSS or USS.
  • the UE may not perform a PDCCH monitoring operation while performing a detection operation of a burst signal (eg, COT).
  • the UE may not perform a burst signal (eg, COT) detection operation during the PDCCH monitoring operation.
  • the PDCCH monitoring operation may be performed until the end of COT set by the base station.
  • COT may be set based on the LBT method.
  • DCI including COT configuration information may be transmitted from a base station to a terminal.
  • the terminal can obtain the COT setting information by receiving the DCI from the base station, and can confirm the end point of the COT based on the COT setting information.
  • the UE may perform a PDCCH monitoring operation until the end point of the COT indicated by the COT setting information (for example, a slot corresponding to the end point of the COT). After the end of the COT (for example, a slot corresponding to the end of the COT), the UE may not perform a PDCCH monitoring operation.
  • the UE may perform a burst signal (eg, COT) detection operation instead of the PDCCH monitoring operation.
  • the terminal may detect a burst signal (eg, COT) by receiving an initial signal (eg, preamble, reference signal, PDCCH) from the base station.
  • the initial signal PDCCH may be a PDCCH obtained from CSS or USS.
  • the UE may not perform a PDCCH monitoring operation while performing a detection operation of a burst signal (eg, COT).
  • the UE may not perform a burst signal (eg, COT) detection operation during the PDCCH monitoring operation.
  • the PDCCH monitoring operation may be performed in a specific time period (eg, m t ).
  • the base station may transmit an upper layer message (for example, an RRC message) including information indicating the length of m t and information indicating the start time of m t to the terminal.
  • information indicating a start time of t m may be an offset to the starting point of m t from the start of the burst signal (e.g., COT).
  • m t may be initialized or m t may be counted.
  • m t may be initialized.
  • the UE may start counting m t .
  • the UE may perform a monitoring operation to PDCCH (slot, for example, the expiration time of t m) expiration time of t m.
  • PDCCH slot, for example, the expiration time of t m
  • the UE may not perform a PDCCH monitoring operation.
  • the UE may perform a burst signal (eg, COT) detection operation instead of the PDCCH monitoring operation.
  • the terminal may detect a burst signal (eg, COT) by receiving an initial signal (eg, preamble, reference signal, PDCCH) from the base station.
  • the initial signal PDCCH may be a PDCCH obtained from CSS or USS.
  • the UE may not perform a PDCCH monitoring operation while performing a detection operation of a burst signal (eg, COT).
  • the UE may not perform a burst signal (eg, COT) detection operation during the PDCCH monitoring operation.
  • m t When m t has expired, m t may be initialized.
  • the terminal may receive the COT configuration information from the base station, and may determine the stopping point of the PDCCH monitoring operation based on the COT setting information, and may not perform the PDCCH monitoring operation after the stopping point of the PDCCH monitoring operation. For example, the terminal may check the end point of the COT based on the COT setting information and perform a burst signal detection operation instead of the PDCCH monitoring operation after the end point of the COT.
  • the PDCCH monitoring method in an unlicensed band may be performed based on one or more of the methods listed in Table 1 below.
  • the PDCCH monitoring operation may not be performed in an unlicensed band (for example, COT).
  • the UE may perform a monitoring operation based on the setting information of the PDCCH monitoring application for the scheme B in the starting slot (for example, a partial slot) of the COT.
  • a monitoring operation may be performed based on the setting information of the PDCCH monitoring application for method C.
  • the terminal may perform a monitoring operation based on the setting information of the PDCCH monitoring application for the scheme C in the COT.
  • the PDCCH monitoring location setting for method B may be different from the PDCCH monitoring location setting for method C.
  • one search space information includes setting information of the PDCCH monitoring application for method B (hereinafter referred to as “method B setting information”) and setting information of the PDCCH monitoring application for method C (hereinafter “method C”). Configuration information).
  • search space B information including the method B setting information may be generated, and search space C information including the method C setting information may be set.
  • the PDCCH monitoring method based on the methods B and C can be performed as follows.
  • 15 is a flowchart illustrating a first embodiment of a method for monitoring PDCCH in a wireless communication network.
  • the wireless communication network may include a base station and a terminal.
  • the base station may be one of the base stations 110, 120, 130 shown in FIG. 1
  • the terminal may be a terminal connected to one or more of the base stations 110, 120, 130 shown in FIG.
  • Each of the base station and the terminal may be configured the same or similar to the communication node 200 shown in FIG. 2.
  • the base station can generate CORESET information.
  • CORESET information may include one or more of the parameters listed in Table 2 below.
  • the search space information may include the method C setting information without the method B setting information.
  • the search space information may include the method C setting information without the method B setting information.
  • the method B setting information is included in the search space information associated with CORESET.
  • both the method B setting information and the method C setting information may be included in the corresponding search space information.
  • the base station can generate search space information.
  • the search space information may include one or more of the parameters listed in Table 3 below.
  • the base station can generate search space B information including "searchSpaceId”, “controlResourceSetId”, and “Method B setting information”, and includes “searchSpaceId”, “controlResourceSetId”, and “Method C setting information” Search space C information can be generated.
  • the method B setting information in Table 3 may be different from the method C setting information in Table 3.
  • the method B setting information in Table 3 may not include "monitoringSlotPeriodicityAndOffset” and "duration".
  • "monitoringSymbolsWithinSlot" included in the method B configuration information may indicate a plurality of symbols. Since the slot includes 14 symbols, "monitoringSymbolsWithinSlot" of each of the method B configuration information and the method C configuration information may be a bitmap composed of 14 bits. Each of the bits included in the bitmap may indicate whether a PDCCH monitoring operation is performed on a symbol corresponding to the corresponding bit.
  • "monitoringSymbolsWithinSlot" of the method B setting information may be set to "00001000010000”
  • “monitoringSymbolsWithinSlot” of the method C setting information may be set to "10000000000000”.
  • the base station may generate an upper layer message (for example, an RRC message) including CORESET information and search space information, and may transmit an upper layer message to the terminal (S1510).
  • CORESET information included in the upper layer message may include one or more of the parameters shown in Table 2.
  • "Pdcch-occasion-PresentInSS" of CORESET information may be set to 1.
  • the search space information associated with CORESET may include both type B setting information and type C setting information.
  • the search space information included in the upper layer message may be associated with the CORESET information, and the search space information may include one or more of the parameters shown in Table 3.
  • the search space information may include "searchSpaceId”, "controlResourceSetId”, method B configuration information, and method C configuration information.
  • "ControlResourceSetId" of the search space information may indicate a CORESET set by an upper layer message (that is, CORESET information) transmitted in step S1510.
  • the terminal may receive an upper layer message from the base station, and may check CORESET information and search space information included in the upper layer message (S1520).
  • the base station can set the COT based on the LBT method in the unlicensed band, and transmit a burst signal in the COT (S1530). Also, the base station may transmit an initial signal (eg, preamble, reference signal, synchronization signal, PDCCH) before COT. The initial signal may be used to detect a COT (eg, burst signal) at the terminal.
  • the burst signal may include a PDCCH, a PDSCH, and a reference signal.
  • COT may include slots #n to # n + 4, and slot #n, which is a starting slot of COT, may be a normal slot.
  • a general slot may include 14 symbols.
  • the base station can transmit the DCI in the PDCCH monitoring location indicated by "CORESET information + Method C configuration information".
  • the DCI (eg, DCI transmitted in the start slot of the COT) may include one or more of COT configuration information, PDSCH scheduling information, and PDCCH activation information.
  • the COT setting information may include one or more of information indicating a start point of the COT, information indicating a length of the COT, information indicating an end point of the COT, and information indicating a slot / symbol format included in the COT. have.
  • Information indicating the slot / symbol format included in the COT may indicate DL slot, FL slot, UL slot, DL symbol, FL symbol, and / or UL symbol.
  • the PDSCH scheduling information may include one or more of information indicating a time resource of the PDSCH, information indicating a frequency resource of the PDSCH, information indicating an MCS, and transmission power.
  • the PDCCH activation information may indicate activation or deactivation of a PDCCH monitoring application set by way C setting information included in the search space information and CORESET information associated with the search space.
  • the COT includes slots #n to # n + 4
  • the number of remaining slots excluding the starting slot (eg, slot #n) among the slots included in the COT is 4, so the PDCCH activation information is composed of 4 bits. It may be a bitmap.
  • the PDCCH activation information set to "1010" may indicate that "slots # n + 1 and # n + 3 are activated and slots # n + 2 and n + 4 are deactivated".
  • DCI may be transmitted through the PDCCH in PDCCH monitoring locations in slots # n + 1 and # n + 3, and DCI may be transmitted through PDCCH in PDCCH monitoring locations in slots # n + 2 and # n + 4. It may not be transmitted.
  • the PDCCH activation information may consist of 1 bit.
  • the PDCCH activation information may indicate that monitoring according to the method B is deactivated and monitoring according to the method C is activated from a reception time point (for example, a transmission time point) of the corresponding PDCCH activation information.
  • the base station After transmitting the DCI in the COT, the base station can transmit the PDSCH to the UE using resources indicated by the DCI.
  • DCI transmitted in a slot other than the start slot of the COT may not include COT configuration information and PDCCH activation information.
  • COT may include slots #n to # n + 4, and slot #n, which is a starting slot of COT, may be a partial slot.
  • slot #n of the COT may include symbol # 4-13.
  • the base station may transmit the DCI through the PDCCH monitoring application indicated by "CORESET information + method B configuration information" in the start slot (for example, slot #n) of the COT.
  • the DCI (eg, DCI transmitted in the start slot of the COT) may include one or more of COT configuration information, PDSCH scheduling information, and PDCCH activation information. After transmitting the DCI in the start slot (for example, slot #n) of the COT, the base station may transmit the PDSCH to the UE using resources indicated by the DCI.
  • the base station may transmit DCI through the PDCCH monitoring application indicated by "CORESET information + Method C configuration information” or "CORESET information + Method C configuration information + PDCCH activation information" in the next slot of the start slot of the COT.
  • the DCI may not include COT configuration information and PDCCH activation information.
  • the base station After transmitting the DCI in the next slot of the start slot of the COT, the base station can transmit the PDSCH to the UE using resources indicated by the DCI.
  • the UE may determine that the COT is set when a specific signal (eg, an initial signal) is detected in an unlicensed band.
  • the terminal may determine that the COT is set in another way.
  • the UE may receive a burst signal from a base station in COT (S1540). A method of receiving a burst signal in COT may be performed as follows.
  • 16 is a flowchart illustrating a first embodiment of a method for receiving a burst signal in a wireless communication network.
  • the UE may determine whether the starting point of the COT is a slot boundary (S1541).
  • a method of receiving a burst signal may be as follows.
  • the terminal may perform a monitoring operation in the PDCCH monitoring application indicated by "CORESET information + method C configuration information" in the start slot of the COT (S1542).
  • the terminal may receive the DCI from the base station by performing a monitoring operation.
  • the DCI may include one or more of COT configuration information, PDSCH scheduling information, and PDCCH activation information.
  • the UE may receive the PDSCH from the base station in resources indicated by the DCI (S1543).
  • the UE may perform a monitoring operation in the PDCCH monitoring location indicated by "CORESET information + Method C configuration information” or “CORESET information + Method C configuration information + PDCCH activation information" in the next slot of the start slot of the COT ( S1546).
  • the terminal may receive the DCI from the base station by performing a monitoring operation.
  • the DCI may include PDSCH scheduling information.
  • the UE may receive the PDSCH from the base station in resources indicated by the DCI (S1547).
  • the method of receiving the burst signal may be as follows.
  • the terminal may perform a monitoring operation in the PDCCH monitoring application indicated by "CORESET information + method B configuration information" in the start slot of the COT (S1544).
  • the terminal may receive the DCI from the base station by performing a monitoring operation.
  • the DCI may include one or more of COT configuration information, PDSCH scheduling information, and PDCCH activation information.
  • the UE may receive the PDSCH from the base station in resources indicated by the DCI (S1545).
  • the UE may perform a monitoring operation in the PDCCH monitoring location indicated by "CORESET information + Method C configuration information” or “CORESET information + Method C configuration information + PDCCH activation information" in the next slot of the start slot of the COT ( S1546).
  • the terminal may receive the DCI from the base station by performing a monitoring operation.
  • the DCI may include PDSCH scheduling information.
  • the UE may receive the PDSCH from the base station in resources indicated by the DCI (S1547).
  • the methods according to the present invention may be implemented in the form of program instructions that can be executed through various computer means and recorded in a computer readable medium.
  • Computer-readable media may include program instructions, data files, data structures, or the like alone or in combination.
  • the program instructions recorded on the computer-readable medium may be specially designed and configured for the present invention or may be known and usable by those skilled in computer software.
  • Examples of computer-readable media include hardware devices specifically configured to store and execute program instructions, such as roms, rams, flash memories, and the like.
  • Examples of program instructions include high-level language code that can be executed by a computer using an interpreter, etc., as well as machine code such as that produced by a compiler.
  • the above-described hardware device may be configured to operate with at least one software module to perform the operation of the present invention, and vice versa.

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

Abstract

L'invention concerne un procédé et un dispositif de transmission et de réception de signaux dans une bande sans licence. Un procédé d'exploitation d'un terminal consiste à : recevoir d'une station de base des informations de CORESET; recevoir de la station de base des informations d'espace de recherche associées aux informations de CORESET; et exécuter une opération de surveillance dans une occasion de surveillance de PDCCH d'une bande sans licence indiquée par les informations de CORESET et les informations d'espace de recherche. Les performances d'un réseau de communication sans fil peuvent ainsi être améliorées.
PCT/KR2019/011663 2018-09-10 2019-09-09 Procédé et dispositif de transmission et de réception de signaux dans une bande sans licence Ceased WO2020055075A1 (fr)

Applications Claiming Priority (10)

Application Number Priority Date Filing Date Title
KR10-2018-0107592 2018-09-10
KR20180107592 2018-09-10
KR20180127785 2018-10-24
KR10-2018-0127785 2018-10-24
KR20190027146 2019-03-08
KR10-2019-0027146 2019-03-08
KR20190097465 2019-08-09
KR10-2019-0097465 2019-08-09
KR1020190109839A KR102836757B1 (ko) 2018-09-10 2019-09-05 비면허 대역에서 신호의 송수신을 위한 방법 및 장치
KR10-2019-0109839 2019-09-05

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WO2021244413A1 (fr) * 2020-06-02 2021-12-09 Shanghai Langbo Communication Technology Company Limited Procédé et dispositif dans un nœud utilisé pour les communications sans fil
CN113810994A (zh) * 2020-06-11 2021-12-17 上海朗帛通信技术有限公司 一种被用于无线通信的节点中的方法和装置
US11764908B2 (en) 2020-07-31 2023-09-19 Electronics And Telecommunications Research Institute Method and apparatus for transmitting a HARQ codebook based on reference time
US12232133B2 (en) 2021-03-18 2025-02-18 Electronics And Telecommunications Research Institute Method and apparatus for channel access in communication system supporting unlicensed band

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US11764908B2 (en) 2020-07-31 2023-09-19 Electronics And Telecommunications Research Institute Method and apparatus for transmitting a HARQ codebook based on reference time
US12149362B2 (en) 2020-07-31 2024-11-19 Electronics And Telecommunications Research Institute Method and apparatus for transmitting a hybrid automatic repeat request (HARQ) response of a physical downlink shared channel (PDSCH)
US12232133B2 (en) 2021-03-18 2025-02-18 Electronics And Telecommunications Research Institute Method and apparatus for channel access in communication system supporting unlicensed band

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