WO2021065016A1 - 端末及び通信方法 - Google Patents

端末及び通信方法 Download PDF

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Publication number
WO2021065016A1
WO2021065016A1 PCT/JP2019/039410 JP2019039410W WO2021065016A1 WO 2021065016 A1 WO2021065016 A1 WO 2021065016A1 JP 2019039410 W JP2019039410 W JP 2019039410W WO 2021065016 A1 WO2021065016 A1 WO 2021065016A1
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WO
WIPO (PCT)
Prior art keywords
search space
terminal
base station
downlink control
control channel
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/JP2019/039410
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English (en)
French (fr)
Japanese (ja)
Inventor
慎也 熊谷
浩樹 原田
聡 永田
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.)
NTT Docomo Inc
Original Assignee
NTT Docomo Inc
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 NTT Docomo Inc filed Critical NTT Docomo Inc
Priority to EP19947439.6A priority Critical patent/EP4040828A4/en
Priority to CN201980101013.9A priority patent/CN114467323A/zh
Priority to US17/754,412 priority patent/US20220386281A1/en
Priority to JP2021550943A priority patent/JP7339356B2/ja
Priority to PCT/JP2019/039410 priority patent/WO2021065016A1/ja
Publication of WO2021065016A1 publication Critical patent/WO2021065016A1/ja
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W16/00—Network planning, e.g. coverage or traffic planning tools; Network deployment, e.g. resource partitioning or cells structures
    • H04W16/14—Spectrum sharing arrangements between different networks
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/20—Control channels or signalling for resource management
    • H04W72/23—Control channels or signalling for resource management in the downlink direction of a wireless link, i.e. towards a 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 signalling, i.e. of overhead other than pilot signals
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0058—Allocation criteria
    • H04L5/0064—Rate requirement of the data, e.g. scalable bandwidth, data priority
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/04—Wireless resource allocation
    • H04W72/044—Wireless resource allocation based on the type of the allocated resource
    • H04W72/0446—Resources in time domain, e.g. slots or frames
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/0001—Arrangements for dividing the transmission path
    • H04L5/0003—Two-dimensional division
    • H04L5/0005—Time-frequency
    • H04L5/0007—Time-frequency the frequencies being orthogonal, e.g. OFDM(A) or DMT
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
    • Y02D30/00—Reducing energy consumption in communication networks
    • Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks

Definitions

  • the present invention relates to a terminal and a communication method in a wireless communication system.
  • NR New Radio
  • LTE Long Term Evolution
  • the frequency band licensed by the telecommunications carrier (operator) (the frequency band different from the licensed band (unlicensed band), unlicensed”
  • the use of carriers (also called unlicensed carriers) and unlicensed CCs (also called unlicensed CCs) is supported.
  • unlicensed bands for example, Wi-Fi (registered trademark) or Bluetooth (registered trademark) can be used2. .4 GHz band, 5 GHz band, 6 GHz band, etc. are assumed.
  • Rel-13 supports carrier aggregation (CA) that integrates licensed band carriers (CC) and unlicensed band carriers (CC). Communication performed using the unlicensed band together with the license band in this way is referred to as License-Assisted Access (LAA).
  • CA carrier aggregation
  • LAA License-Assisted Access
  • a base station device downlink
  • a user terminal uplink
  • another device for example, a base
  • Channel sensing carrier sense
  • LBT Listen Before Talk
  • GC Group common
  • PDCCH Physical Downlink Control Channel
  • the present invention has been made in view of the above points, and an object of the present invention is to switch the search space in a wireless communication system for efficient monitoring.
  • a receiver that monitors the search space of the downlink control channel, and when the downlink control channel is detected, the first search space is switched to the second search space, and the signal of the base station is transmitted.
  • a long terminal is provided.
  • a technology for efficiently monitoring by switching the search space is provided in the wireless communication system.
  • LTE Long Term Evolution
  • LTE-Advanced LTE-Advanced and later methods (eg, NR) unless otherwise specified.
  • SS Synchronization signal
  • PSS Primary SS
  • SSS Secondary SS
  • PBCH Physical broadcast channel
  • PRACH Physical
  • PDCCH Physical Downlink Control Channel
  • PDSCH Physical Downlink Shared Channel
  • PUCCH Physical Uplink Control Channel
  • PUSCH Physical Uplink Shared Channel
  • NR corresponds to NR-SS, NR-PSS, NR-SSS, NR-PBCH, NR-PRACH and the like. However, even if it is a signal used for NR, it is not always specified as "NR-".
  • the duplex system may be a TDD (Time Division Duplex) system, an FDD (Frequency Division Duplex) system, or other system (for example, Flexible Duplex, etc.). Method may be used.
  • TDD Time Division Duplex
  • FDD Frequency Division Duplex
  • Method may be used.
  • "configuring" the radio parameter or the like may mean that a predetermined value is set in advance (Pre-configure), or the base station 10 or The radio parameter notified from the terminal 20 may be set.
  • FIG. 1 is a diagram showing a configuration example of a wireless communication system according to the embodiment of the present invention.
  • the wireless communication system according to the embodiment of the present invention includes a base station 10 and a terminal 20 as shown in FIG.
  • FIG. 1 shows one base station 10 and one terminal 20, this is an example, and there may be a plurality of each.
  • the base station 10 is a communication device that provides one or more cells and performs wireless communication with the terminal 20.
  • the physical resources of the radio signal are defined in the time domain and the frequency domain, the time domain may be defined by the number of OFDM (Orthogonal Frequency Division Multiplexing) symbols, and the frequency domain is defined by the number of subcarriers or the number of resource blocks. May be good.
  • the base station 10 transmits a synchronization signal and system information to the terminal 20. Synchronous signals are, for example, NR-PSS and NR-SSS.
  • the system information is transmitted by, for example, NR-PBCH, and is also referred to as broadcast information. As shown in FIG.
  • the base station 10 transmits a control signal or data to the terminal 20 by DL (Downlink), and receives the control signal or data from the terminal 20 by UL (Uplink). Both the base station 10 and the terminal 20 can perform beamforming to transmit and receive signals. Further, both the base station 10 and the terminal 20 can apply MIMO (Multiple Input Multiple Output) communication to DL or UL. Further, both the base station 10 and the terminal 20 may communicate via a secondary cell (SCell: Secondary Cell) and a primary cell (PCell: Primary Cell) by CA (Carrier Aggregation). Further, the terminal 20 may perform communication via the primary cell of the base station 10 by DC (Dual Connectivity) and the primary secondary cell (PSCell: Primary Secondary Cell) of another base station 10.
  • SCell Secondary Cell
  • PCell Primary Cell
  • CA Carrier Aggregation
  • the terminal 20 is a communication device having a wireless communication function such as a smartphone, a mobile phone, a tablet, a wearable terminal, and a communication module for M2M (Machine-to-Machine). As shown in FIG. 1, the terminal 20 receives a control signal or data from the base station 10 by DL, and transmits the control signal or data to the base station 10 by UL, so that various types provided by the wireless communication system are provided. Use communication services.
  • M2M Machine-to-Machine
  • FIG. 2 is a diagram for explaining a wireless communication system according to an embodiment of the present invention.
  • FIG. 2 shows a configuration example of a wireless communication system when NR-DC (NR-Dual connectivity) is executed.
  • a base station 10A serving as an MN (Master Node) and a base station 10B serving as an SN (Secondary Node) are provided.
  • the base station 10A and the base station 10B are each connected to the core network 30.
  • the terminal 20 communicates with both the base station 10A and the base station 10B.
  • the cell group provided by the MN base station 10A is called an MCG (Master Cell Group), and the cell group provided by the SN base station 10B is called an SCG (Secondary Cell Group).
  • MCG Master Cell Group
  • SCG Secondary Cell Group
  • the above-mentioned LBT is executed.
  • the base station 10 or the terminal 20 acquires a COT (Channel Occupancy Time) when the LBT result is idle (when the LBT is successful), performs transmission, and when the LBT result is busy (LBT-busy). , Do not send. That is, the base station 10 or the terminal 20 transmits a signal in the COT.
  • COT Channel Occupancy Time
  • the wireless communication system in the present embodiment may perform a carrier aggregation (CA) operation using an unlicensed CC and a licensed CC, or perform a dual connectivity (DC) operation using the unlicensed CC and the licensed CC.
  • CA carrier aggregation
  • DC dual connectivity
  • SA stand-alone
  • CA, DC, or SA may be performed by any one system of NR and LTE.
  • DC may be performed by at least two of NR, LTE, and other systems.
  • the terminal 20 uses a signal (for example, a Reference Signal (RS) such as Demodulation Reference Signal (DMRS)) in the PDCCH or the group common PDCCH (group common (GC) -PDCCH) for detecting the transmission burst from the base station 10. ) May exist.
  • RS Reference Signal
  • DMRS Demodulation Reference Signal
  • group common PDCCH group common (GC) -PDCCH)
  • the base station 10 may transmit a specific PDCCH (PDCCH or GC-PDCCH) including a specific DMRS notifying the start of the COT at the start of the COT triggered by the base station apparatus.
  • a specific PDCCH (PDCCH or GC-PDCCH) including a specific DMRS notifying the start of the COT at the start of the COT triggered by the base station apparatus.
  • At least one of the specific PDCCH and the specific DMRS may be referred to as a COT start notification signal.
  • the base station 10 transmits a COT start notification signal to one or more terminals 20, and the terminal 20 can recognize the COT when the specific DMRS is detected.
  • the presence of a signal such as DMRS contained in PDCCH or GC-PDCCH is present. You may assume.
  • the power saving operation may be enabled by transmitting the preamble at the beginning of the transmission burst.
  • other signals may be used for the purpose of detecting a transmission burst.
  • the PDCCH and / or the GC-PDCCH transmission payload contains information related to the COT structure and may be used for the power saving operation of the terminal 20.
  • the COT structure may be defined, for example, by the start time and end time when the channel is occupied by the device and the signal is transmitted.
  • the COT structure may include information indicating a frequency domain in which the channel is occupied at the start time and end time when the channel is occupied by the device and the signal is transmitted. Further, the COT structure may be defined by, for example, a start time and an end time at which the base station 10 transmits a signal. Hereinafter, COT may be defined or replaced with the time during which the device occupying the channel transmits a signal.
  • FIG. 3 is a diagram for explaining an example of monitoring. As shown in FIG. 3, Phase A and Phase B are defined for monitoring. Phase A and Phase B may be appropriately switched (dynamic switching).
  • Phase A a search space (SS # 1) for performing relatively frequent PDCCH monitoring in units of mini slots, for example, is set in the terminal 20.
  • Switching from Phase A to Phase B occurs when the terminal 20 succeeds in detecting PDCCH and / or GC-PDCCH.
  • Phase B for example, a search space (SS # 2) for performing normal PDCCH monitoring on a slot-by-slot basis is set in the terminal 20.
  • the switching from Phase B to Phase A occurs when the terminal 20 finishes DL burst transmission from the base station 10 based on the notification related to the COT structure.
  • SS # 2 may have a longer cycle than SS # 1.
  • GC-PDCCH monitoring can be set or not set.
  • the terminal 20 in which GC-PDCCH monitoring is set can notify the COT structure by SFI (Slot format indicator) of DCI format 2_0.
  • SFI Slot format indicator
  • the terminal 20 in which GC-PDCCH monitoring is not set can notify the COT structure by SFI of DCI format 2_0.
  • the end of the DL burst transmitted from the base station 10 by other means is terminated. Need to be detected. That is, it is necessary to specify a dynamic switching operation for switching between Phase A and Phase B for the terminal 20 in which the GC-PDCCH is set and the terminal 20 in which the GC-PDCCH is not set.
  • NR-U high frequency utilization efficiency and power consumption reduction are realized in each of the terminal 20 in which GC-PDCCH is set and the terminal 20 in which GC-PDCCH is not set.
  • a search space having a plurality of different PDCCH monitoring cycles and whether or not GC-PDCCH is transmitted may be set.
  • the terminal 20 set to have the transmission of GC-PDCCH may switch the search space to be applied based on the COT structure notified by GC-PDCCH. That is, the terminal 20 may switch the search space to be applied based on the setting information related to PDCCH monitoring.
  • the terminal 20 which is set not to transmit GC-PDCCH or is not set to transmit GC-PDCCH may switch the search space to be applied based on the detection result of PDCCH or the DMRS detection result of PDCCH. Good. That is, the terminal 20 may switch the search space to be applied based on the result of PDCCH monitoring.
  • FIG. 4 is a sequence diagram for explaining an example of signaling in the embodiment of the present invention.
  • the base station 10 may transmit a DL burst to the terminal 20.
  • step S1 the base station 10 notifies the terminal 20 of the settings related to PDCCH monitoring via higher layer signaling.
  • a search space (SS: Search space) having a plurality of different PDCCH monitoring cycles may be notified to the terminal 20. Further, the terminal 20 may be notified whether or not the GC-PDCCH is transmitted.
  • step S2 the base station 10 transmits the DCI for scheduling the PDSCH to the terminal 20 via the PDCCH.
  • the terminal 20 executes the set PDCCH monitoring and detects the PDCCH.
  • the PDCCH transmitted from the base station 10 may form a transmission burst.
  • the terminal 20 may not receive the DCI but only detect the DMRS of the PDCCH.
  • step S3 the terminal 20 receives data from the base station 10 via the PDSCH based on the received DCI.
  • step S2 if the terminal 20 does not receive the DCI and only detects the DMRS of the PDCCH, the step S3 may not be executed.
  • step S1 the terminal 20A is set to have GC-PDCCH transmission, and the terminal 20B is set to have no GC-PDCCH transmission. It is not necessary to make settings related to GC-PDCCH transmission in the terminal 20B.
  • the search space SS # 1 is set to the default USS (UE-specific Search Space), and the search space SS # 2 is set to the USS during the transmission period of the serving gNB.
  • the monitoring cycle of SS # 1 may be shorter than the slot length.
  • the monitoring cycle of SS # 2 may be equal to the slot length.
  • the terminal 20A and the terminal 20B which search space is SS # 1 and which search space is SS # 2.
  • the notification may be made by any of the methods 1) and 4) shown below.
  • the search space whose monitoring cycle set by the information element searchSpace is shorter than the slot length may be designated as SS # 1, and the search space whose monitoring cycle set by the set monitoring cycle is shorter than the slot length may be designated as SS # 2.
  • the search space set by searchSpaceOne is SS # 1
  • the search space set by searchSpaceTwo is SS # 2.
  • the name of the information element is an example and may be another name.
  • the searchSpaceId included in the information element searchSpace is an even number, it may be SS # 1, and if it is an odd number, it may be SS # 2.
  • searchSpaceId is a specific number (for example, 1), it may be SS # 1, and if it is any other number, it may be SS # 2.
  • searchSpaceType included in the information element searchSpace may notify which search space is SS # 1 or SS # 2.
  • the name of the information element is an example and may be another name.
  • the terminal 20A set to have GC-PDCCH transmission in step S1 may switch the search space to be applied based on the COT structure notified by GC-PDCCH.
  • the DCI format 2_0 may notify the terminal 20A of the structure of the COT time domain.
  • the terminal 20A may determine that the specified slot is outside the COT.
  • the terminal 20A may detect a CRC-scrambled DCI format 2_0 with a new RNTI to replace the SFI-RNTI (Radio network temporary identifier)
  • the last slot notified by the DCI format 2_0 is the end of the COT. It may be determined that.
  • the terminal 20A monitors SS # 1 in the slots after the end of COT, and SS # 2 does not have to be monitored.
  • FIG. 5 is a diagram for explaining an example (1) of monitoring in the embodiment of the present invention.
  • the terminal 20B that is set to have no GC-PDCCH transmission or is not set to transmit GC-PDCCH is a search space to be applied based on the DMRS detection result of PDCCH as shown in FIG. May be switched. Further, the terminal 20B may switch the search space to be applied based on the detection result of PDCCH.
  • the terminal 20B may switch to monitor SS # 2 if it succeeds in detecting PDCCH while monitoring SS # 1. Further, when the terminal 20B fails to detect DMRS of PDCCH n times in a row while monitoring SS # 2, it determines that the COT of the base station 10 has ended, and switches to monitor SS # 1. It is not necessary to monitor SS # 2.
  • FIG. 6 is a diagram for explaining an example (2) of monitoring in the embodiment of the present invention.
  • the terminal 20B starts the timer when the DMRS detection of the PDCCH fails n times in a row, determines that the COT of the base station 10 has ended when the timer expires, and monitors SS # 1. It is not necessary to monitor SS # 2 by switching to.
  • N and the timer expiration time may be set by higher layer signaling. If the terminal 20B succeeds in detecting DMRS on the PDCCH by the time the timer expires, the timer is stopped and initialized.
  • the terminal 20B which is set not to transmit GC-PDCCH or is not set to transmit GC-PDCCH does not have to assume the switching of the search space. That is, only one search space may be set in the terminal 20B, or when a plurality of search spaces are set, it may be assumed that only the default search space is applied.
  • Search space switching based on the COT structure notified by GC-PDCCH, search space switching based on the PDCCH DMRS detection result, and search space switching based on the PDCCH detection result are bases as one UE capability. It may be reported to the station 10 or may be reported to the base station 10 as separate UE capabilities. If each is reported to base station 10 as a separate UE capability, any UE capability may be mandatory.
  • the terminal 20 can monitor the PDCCH by switching the search spaces having different monitoring cycles according to the communication status. That is, in NR-U, high frequency utilization efficiency and power consumption reduction are realized in each of the terminal 20 in which the GC-PDCCH is set and the terminal 20 in which the GC-PDCCH is not set.
  • the search space can be switched and monitoring can be performed efficiently.
  • the base station 10 and the terminal 20 include a function of carrying out the above-described embodiment.
  • the base station 10 and the terminal 20 may each have only a part of the functions in the embodiment.
  • FIG. 7 is a diagram showing an example of the functional configuration of the base station 10 according to the embodiment of the present invention.
  • the base station 10 includes a transmission unit 110, a reception unit 120, a setting unit 130, and a control unit 140.
  • the functional configuration shown in FIG. 7 is only an example. Any function classification and name of the functional unit may be used as long as the operation according to the embodiment of the present invention can be executed.
  • the transmission unit 110 includes a function of generating a signal to be transmitted to the terminal 20 side and transmitting the signal wirelessly. Further, the transmission unit 110 transmits a message between network nodes to another network node.
  • the receiving unit 120 includes a function of receiving various signals transmitted from the terminal 20 and acquiring information of, for example, a higher layer from the received signals. Further, the transmission unit 110 has a function of transmitting NR-PSS, NR-SSS, NR-PBCH, DL / UL control signals and the like to the terminal 20. In addition, the receiving unit 120 receives a message between network nodes from another network node.
  • the setting unit 130 stores preset setting information and various setting information to be transmitted to the terminal 20.
  • the content of the setting information is, for example, a setting related to NR-U communication.
  • the control unit 140 controls the UL grant as described in the embodiment.
  • the function unit related to signal transmission in the control unit 140 may be included in the transmission unit 110, and the function unit related to signal reception in the control unit 140 may be included in the reception unit 120.
  • FIG. 8 is a diagram showing an example of the functional configuration of the terminal 20 according to the embodiment of the present invention.
  • the terminal 20 has a transmission unit 210, a reception unit 220, a setting unit 230, and a control unit 240.
  • the functional configuration shown in FIG. 8 is only an example. Any function classification and name of the functional unit may be used as long as the operation according to the embodiment of the present invention can be executed.
  • the transmission unit 210 creates a transmission signal from the transmission data and wirelessly transmits the transmission signal.
  • the receiving unit 220 wirelessly receives various signals and acquires a signal of a higher layer from the received signal of the physical layer. Further, the receiving unit 220 has a function of receiving NR-PSS, NR-SSS, NR-PBCH, DL / UL / SL control signals and the like transmitted from the base station 10. Further, for example, the transmission unit 210 connects the other terminal 20 to PSCCH (Physical Sidelink Control Channel), PSCH (Physical Sidelink Shared Channel), PSDCH (Physical Sidelink Discovery Channel), PSBCH (Physical Sidelink Broadcast Channel) as D2D communication. Etc., and the receiving unit 220 receives PSCCH, PSCH, PSDCH, PSBCH, etc. from the other terminal 20.
  • PSCCH Physical Sidelink Control Channel
  • PSCH Physical Sidelink Shared Channel
  • PSDCH Physical Sidelink Discovery Channel
  • PSBCH Physical Sidelink Broadcast Channel
  • the setting unit 230 stores various setting information received from the base station 10 by the receiving unit 220.
  • the setting unit 230 also stores preset setting information.
  • the content of the setting information is, for example, a setting related to NR-U communication.
  • the control unit 240 controls to monitor the PDCCH as described in the embodiment.
  • the function unit related to signal transmission in the control unit 240 may be included in the transmission unit 210, and the function unit related to signal reception in the control unit 240 may be included in the reception unit 220.
  • each functional block may be realized by using one device that is physically or logically connected, or directly or indirectly (for example, by two or more devices that are physically or logically separated). , Wired, wireless, etc.) and may be realized using these plurality of devices.
  • the functional block may be realized by combining the software with the one device or the plurality of devices.
  • Functions include judgment, decision, judgment, calculation, calculation, processing, derivation, investigation, search, confirmation, reception, transmission, output, access, solution, selection, selection, establishment, comparison, assumption, expectation, and assumption. Broadcasting, notifying, communicating, forwarding, configuring, reconfiguring, allocating, mapping, assigning, etc., but limited to these I can't.
  • a functional block (constituent unit) that functions transmission is called a transmitting unit (transmitting unit) or a transmitter (transmitter).
  • transmitting unit transmitting unit
  • transmitter transmitter
  • the base station 10, the terminal 20, and the like in one embodiment of the present disclosure may function as a computer that processes the wireless communication method of the present disclosure.
  • FIG. 9 is a diagram showing an example of the hardware configuration of the base station 10 and the terminal 20 according to the embodiment of the present disclosure.
  • the above-mentioned base station 10 and terminal 20 are physically configured as a computer device including a processor 1001, a storage device 1002, an auxiliary storage device 1003, a communication device 1004, an input device 1005, an output device 1006, a bus 1007, and the like. May be good.
  • the word “device” can be read as a circuit, device, unit, etc.
  • the hardware configuration of the base station 10 and the terminal 20 may be configured to include one or more of the devices shown in the figure, or may be configured not to include some of the devices.
  • the processor 1001 For each function of the base station 10 and the terminal 20, the processor 1001 performs an operation by loading predetermined software (program) on the hardware such as the processor 1001 and the storage device 1002, and controls the communication by the communication device 1004. It is realized by controlling at least one of reading and writing of data in the storage device 1002 and the auxiliary storage device 1003.
  • Processor 1001 operates, for example, an operating system to control the entire computer.
  • the processor 1001 may be composed of a central processing unit (CPU: Central Processing Unit) including an interface with a peripheral device, a control device, an arithmetic unit, a register, and the like.
  • CPU Central Processing Unit
  • control unit 140, control unit 240, and the like may be realized by the processor 1001.
  • the processor 1001 reads a program (program code), a software module, data, or the like from at least one of the auxiliary storage device 1003 and the communication device 1004 into the storage device 1002, and executes various processes according to these.
  • a program program that causes a computer to execute at least a part of the operations described in the above-described embodiment is used.
  • the control unit 140 of the base station 10 shown in FIG. 7 may be realized by a control program stored in the storage device 1002 and operated by the processor 1001.
  • the control unit 240 of the terminal 20 shown in FIG. 8 may be realized by a control program stored in the storage device 1002 and operated by the processor 1001.
  • Processor 1001 may be implemented by one or more chips.
  • the program may be transmitted from the network via a telecommunication line.
  • the storage device 1002 is a computer-readable recording medium, for example, by at least one of ROM (Read Only Memory), EPROM (Erasable Programmable ROM), EPROM (Electrically Erasable Programmable ROM), RAM (Random Access Memory), and the like. It may be configured.
  • the storage device 1002 may be referred to as a register, a cache, a main memory (main storage device), or the like.
  • the storage device 1002 can store a program (program code), a software module, or the like that can be executed to implement the communication method according to the embodiment of the present disclosure.
  • the auxiliary storage device 1003 is a computer-readable recording medium, and is, for example, an optical disk such as a CD-ROM (Compact Disc ROM), a hard disk drive, a flexible disk, an optical magnetic disk (for example, a compact disk, a digital versatile disk, Blu).
  • -It may be composed of at least one of a ray (registered trademark) disk), a smart card, a flash memory (for example, a card, a stick, a key drive), a floppy (registered trademark) disk, a magnetic strip, and the like.
  • the storage medium described above may be, for example, a database, server or other suitable medium containing at least one of the storage device 1002 and the auxiliary storage device 1003.
  • the communication device 1004 is hardware (transmission / reception device) for communicating between computers via at least one of a wired network and a wireless network, and is also referred to as, for example, a network device, a network controller, a network card, a communication module, or the like.
  • the communication device 1004 includes, for example, a high frequency switch, a duplexer, a filter, a frequency synthesizer, and the like in order to realize at least one of frequency division duplex (FDD: Frequency Division Duplex) and time division duplex (TDD: Time Division Duplex). It may be composed of.
  • FDD Frequency Division Duplex
  • TDD Time Division Duplex
  • the transmission / reception unit may be physically or logically separated from each other in the transmission unit and the reception unit.
  • the input device 1005 is an input device (for example, a keyboard, a mouse, a microphone, a switch, a button, a sensor, etc.) that receives an input from the outside.
  • the output device 1006 is an output device (for example, a display, a speaker, an LED lamp, etc.) that outputs to the outside.
  • the input device 1005 and the output device 1006 may have an integrated configuration (for example, a touch panel).
  • each device such as the processor 1001 and the storage device 1002 is connected by a bus 1007 for communicating information.
  • the bus 1007 may be configured by using a single bus, or may be configured by using a different bus for each device.
  • the base station 10 and the terminal 20 are hardware such as a microprocessor, a digital signal processor (DSP: Digital Signal Processor), an ASIC (Application Specific Integrated Circuit), a PLD (Programmable Logic Device), and an FPGA (Field Programmable Gate Array). It may be configured to include, and a part or all of each functional block may be realized by the hardware. For example, processor 1001 may be implemented using at least one of these hardware.
  • DSP Digital Signal Processor
  • ASIC Application Specific Integrated Circuit
  • PLD Programmable Logic Device
  • FPGA Field Programmable Gate Array
  • the receiving unit that monitors the search space of the downlink control channel and the second from the first search space when the downlink control channel is detected. It has a control unit that switches from the second search space to the first search space when it is switched to the search space and determines that the signal transmission of the base station is completed.
  • the second search space is provided with a terminal having a long time domain cycle.
  • the terminal 20 can monitor the PDCCH by switching the search spaces having different monitoring cycles according to the communication status. That is, in NR-U, high frequency utilization efficiency and power consumption reduction are realized in each of the terminal 20 in which the GC-PDCCH is set and the terminal 20 in which the GC-PDCCH is not set. That is, in the wireless communication system, the search space can be switched and monitoring can be performed efficiently.
  • the control unit is based on the downlink control information received via the group common downlink control channel. It may be determined that the COT has been completed. With this configuration, the terminal 20 can switch the search space and efficiently monitor.
  • the control unit When the reception unit is set to have no transmission of the group common downlink control channel by the upper layer signaling received, or when the transmission of the group common downlink control channel is not set, the control unit is set to the downlink. If the detection of the link control channel fails, or if the receiving unit fails to detect the demodulation reference signal of the downlink control channel, it may be determined that the signal transmission of the base station has ended. With this configuration, the terminal 20 can switch the search space and efficiently monitor.
  • the control unit receives the reception unit.
  • the unit fails to detect the downlink control channel or fails to detect the demodulation reference signal of the downlink control channel, the timer is activated, and when the timer expires, the signal transmission of the base station is performed. It may be determined that the process has ended. With this configuration, the terminal 20 can switch the search space and efficiently monitor.
  • the control unit may report that it supports switching of the search space as UE capability. With this configuration, the terminal 20 can report the ability to switch the search space to the base station 10.
  • the reception procedure for monitoring the search space of the downlink control channel and the switching from the first search space to the second search space when the downlink control channel is detected are performed.
  • the terminal executes the control procedure of switching from the second search space to the first search space, and the second search is performed rather than the first search space.
  • Space provides a communication method with a long time domain cycle.
  • the terminal 20 can monitor the PDCCH by switching the search spaces having different monitoring cycles according to the communication status. That is, in NR-U, high frequency utilization efficiency and power consumption reduction are realized in each of the terminal 20 in which the GC-PDCCH is set and the terminal 20 in which the GC-PDCCH is not set. That is, in the wireless communication system, the search space can be switched and monitoring can be performed efficiently.
  • the boundary of the functional unit or the processing unit in the functional block diagram does not always correspond to the boundary of the physical component.
  • the operation of the plurality of functional units may be physically performed by one component, or the operation of one functional unit may be physically performed by a plurality of components.
  • the processing order may be changed as long as there is no contradiction.
  • the base station 10 and the terminal 20 have been described with reference to functional block diagrams, but such devices may be implemented in hardware, software, or a combination thereof.
  • the software operated by the processor of the base station 10 according to the embodiment of the present invention and the software operated by the processor of the terminal 20 according to the embodiment of the present invention are random access memory (RAM), flash memory, and read-only memory, respectively. It may be stored in (ROM), EPROM, EEPROM, registers, hard disk (HDD), removable disk, CD-ROM, database, server or any other suitable storage medium.
  • information notification includes physical layer signaling (for example, DCI (Downlink Control Information), UCI (Uplink Control Information)), higher layer signaling (for example, RRC (Radio Resource Control) signaling, MAC (Medium Access Control) signaling, etc. Broadcast information (MIB (Master Information Block), SIB (System Information Block)), other signals, or a combination thereof may be used.
  • RRC signaling may be referred to as an RRC message, for example, RRC. It may be a connection setup (RRCConnectionSetup) message, an RRC connection reconfiguration (RRCConnectionReconfiguration) message, or the like.
  • Each aspect / embodiment described in the present disclosure includes LTE (Long Term Evolution), LTE-A (LTE-Advanced), SUPER 3G, IMT-Advanced, 4G (4th generation mobile communication system), and 5G (5th generation mobile communication).
  • system FRA (Future Radio Access), NR (new Radio), W-CDMA (registered trademark), GSM (registered trademark), CDMA2000, UMB (Ultra Mobile Broadband), IEEE 802.11 (Wi-Fi (registered trademark)) )), LTE 802.16 (WiMAX®), IEEE 802.20, UWB (Ultra-WideBand), Bluetooth®, and other systems that utilize suitable systems and have been extended based on these. It may be applied to at least one of the next generation systems. Further, a plurality of systems may be applied in combination (for example, a combination of at least one of LTE and LTE-A and 5G).
  • the specific operation performed by the base station 10 in the present specification may be performed by its upper node.
  • various operations performed for communication with the terminal 20 are performed by the base station 10 and other network nodes other than the base station 10 (for example, it is clear that it can be done by at least one of (but not limited to, MME, S-GW, etc.).
  • the other network node may be a combination of a plurality of other network nodes (for example, MME and S-GW). ..
  • the information, signals, etc. described in the present disclosure can be output from the upper layer (or lower layer) to the lower layer (or upper layer). Input / output may be performed via a plurality of network nodes.
  • the input / output information and the like may be stored in a specific location (for example, memory) or may be managed using a management table. Input / output information and the like can be overwritten, updated, or added. The output information and the like may be deleted. The input information or the like may be transmitted to another device.
  • the determination in the present disclosure may be made by a value represented by 1 bit (0 or 1), by a true / false value (Boolean: true or false), or by comparing numerical values (for example). , Comparison with a predetermined value).
  • Software whether referred to as software, firmware, middleware, microcode, hardware description language, or by any other name, is an instruction, instruction set, code, code segment, program code, program, subprogram, software module.
  • Applications, software applications, software packages, routines, subroutines, objects, executable files, execution threads, procedures, features, etc. should be broadly interpreted.
  • software, instructions, information, etc. may be transmitted and received via a transmission medium.
  • a transmission medium For example, a website that uses at least one of wired technology (coaxial cable, fiber optic cable, twist pair, digital subscriber line (DSL: Digital Subscriber Line), etc.) and wireless technology (infrared, microwave, etc.) When transmitted from a server, or other remote source, at least one of these wired and wireless technologies is included within the definition of transmission medium.
  • the information, signals, etc. described in this disclosure may be represented using any of a variety of different techniques.
  • data, instructions, commands, information, signals, bits, symbols, chips, etc. that may be referred to throughout the above description are voltages, currents, electromagnetic waves, magnetic fields or magnetic particles, light fields or photons, or any of these. It may be represented by a combination of.
  • a channel and a symbol may be a signal (signaling).
  • the signal may be a message.
  • the component carrier CC: Component Carrier
  • CC Component Carrier
  • system and “network” used in this disclosure are used interchangeably.
  • the information, parameters, etc. described in the present disclosure may be expressed using absolute values, relative values from predetermined values, or using other corresponding information. It may be represented.
  • the radio resource may be one indicated by an index.
  • base station Base Station
  • wireless base station base station
  • base station device fixed station
  • NodeB nodeB
  • eNodeB eNodeB
  • GNB nodeB
  • access point “ transmission point ”,“ reception point ”,“ transmission / reception point ”,“ cell ”,“ sector ”
  • Terms such as “cell group,” “carrier,” and “component carrier” can be used interchangeably.
  • Base stations are sometimes referred to by terms such as macrocells, small cells, femtocells, and picocells.
  • the base station can accommodate one or more (for example, three) cells.
  • a base station accommodates multiple cells, the entire coverage area of the base station can be divided into multiple smaller areas, each smaller area being a base station subsystem (eg, a small indoor base station (RRH:)).
  • Communication services can also be provided by Remote Radio Head).
  • the term "cell” or “sector” is a part or all of the coverage area of at least one of the base station and the base station subsystem that provides the communication service in this coverage. Point to.
  • MS Mobile Station
  • UE User Equipment
  • Mobile stations can be subscriber stations, mobile units, subscriber units, wireless units, remote units, mobile devices, wireless devices, wireless communication devices, remote devices, mobile subscriber stations, access terminals, mobile terminals, wireless, depending on the trader. It may also be referred to as a terminal, remote terminal, handset, user agent, mobile client, client, or some other suitable term.
  • At least one of the base station and the mobile station may be called a transmitting device, a receiving device, a communication device, or the like. At least one of the base station and the mobile station may be a device mounted on the mobile body, the mobile body itself, or the like.
  • the moving body may be a vehicle (for example, a car, an airplane, etc.), an unmanned moving body (for example, a drone, an autonomous vehicle, etc.), or a robot (manned or unmanned type). ) May be.
  • at least one of the base station and the mobile station includes a device that does not necessarily move during communication operation.
  • at least one of the base station and the mobile station may be an IoT (Internet of Things) device such as a sensor.
  • IoT Internet of Things
  • the base station in the present disclosure may be read by the user terminal.
  • the communication between the base station and the user terminal is replaced with the communication between a plurality of terminals 20 (for example, it may be called D2D (Device-to-Device), V2X (Vehicle-to-Everything), etc.).
  • D2D Device-to-Device
  • V2X Vehicle-to-Everything
  • Each aspect / embodiment of the present disclosure may be applied to the configuration.
  • the terminal 20 may have the function of the base station 10 described above.
  • words such as "up” and “down” may be read as words corresponding to inter-terminal communication (for example, "side”).
  • an uplink channel, a downlink channel, and the like may be read as a side channel.
  • the user terminal in the present disclosure may be read as a base station.
  • the base station may have the functions of the above-mentioned user terminal.
  • determining and “determining” used in this disclosure may include a wide variety of actions.
  • “Judgment” and “decision” are, for example, judgment (judging), calculation (calculating), calculation (computing), processing (processing), derivation (deriving), investigation (investigating), search (looking up, search, inquiry). (For example, searching in a table, database or another data structure), ascertaining may be regarded as “judgment” or “decision”.
  • judgment and “decision” are receiving (for example, receiving information), transmitting (for example, transmitting information), input (input), output (output), and access.
  • Accessing (for example, accessing data in memory) may be regarded as "judgment” or “decision”.
  • judgment and “decision” mean that the things such as solving, selecting, choosing, establishing, and comparing are regarded as “judgment” and “decision”. Can include. That is, “judgment” and “decision” may include considering some action as “judgment” and “decision”. Further, “judgment (decision)” may be read as “assuming”, “expecting”, “considering” and the like.
  • connection means any direct or indirect connection or connection between two or more elements, and each other. It can include the presence of one or more intermediate elements between two “connected” or “combined” elements.
  • the connection or connection between the elements may be physical, logical, or a combination thereof.
  • connection may be read as "access”.
  • the two elements use at least one of one or more wires, cables and printed electrical connections, and, as some non-limiting and non-comprehensive examples, the radio frequency domain. Can be considered to be “connected” or “coupled” to each other using electromagnetic energies having wavelengths in the microwave and light (both visible and invisible) regions.
  • the reference signal can also be abbreviated as RS (Reference Signal), and may be called a pilot (Pilot) depending on the applicable standard.
  • RS Reference Signal
  • Pilot Pilot
  • references to elements using designations such as “first”, “second”, etc. as used in this disclosure does not generally limit the quantity or order of those elements. These designations can be used in the present disclosure as a convenient way to distinguish between two or more elements. Thus, references to the first and second elements do not mean that only two elements can be adopted, or that the first element must somehow precede the second element.
  • each of the above devices may be replaced with a "part”, a “circuit”, a “device”, or the like.
  • the wireless frame may be composed of one or more frames in the time domain. Each one or more frames in the time domain may be referred to as a subframe. Subframes may further consist of one or more slots in the time domain.
  • the subframe may have a fixed time length (eg, 1 ms) that does not depend on numerology.
  • the numerology may be a communication parameter that applies to at least one of the transmission and reception of a signal or channel.
  • Numerology includes, for example, subcarrier spacing (SCS: SubCarrier Spacing), bandwidth, symbol length, cyclic prefix length, transmission time interval (TTI: Transmission Time Interval), number of symbols per TTI, wireless frame configuration, and transmitter / receiver.
  • SCS subcarrier spacing
  • TTI Transmission Time Interval
  • At least one of a specific filtering process performed in the frequency domain, a specific windowing process performed by the transmitter / receiver in the time domain, and the like may be indicated.
  • the slot may be composed of one or more symbols in the time domain (OFDM (Orthogonal Frequency Division Multiplexing) symbol, SC-FDMA (Single Carrier Frequency Division Multiple Access) symbol, etc.). Slots may be in time units based on numerology.
  • OFDM Orthogonal Frequency Division Multiplexing
  • SC-FDMA Single Carrier Frequency Division Multiple Access
  • the slot may include a plurality of mini slots. Each minislot may consist of one or more symbols in the time domain.
  • the mini-slot may also be referred to as a sub-slot.
  • a minislot may consist of a smaller number of symbols than the slot.
  • PDSCH (or PUSCH) transmitted in time units larger than the minislot may be referred to as PDSCH (or PUSCH) mapping type A.
  • the PDSCH (or PUSCH) transmitted using the minislot may be referred to as PDSCH (or PUSCH) mapping type B.
  • the wireless frame, subframe, slot, minislot and symbol all represent the time unit when transmitting a signal.
  • the radio frame, subframe, slot, minislot and symbol may have different names corresponding to each.
  • one subframe may be called a transmission time interval (TTI)
  • TTI transmission time interval
  • TTI transmission time interval
  • TTI transmission time interval
  • TTI transmission time interval
  • TTI time interval
  • TTI transmission time interval
  • TTI transmission time interval
  • TTI slot or one minislot
  • You may. That is, at least one of the subframe and TTI may be a subframe (1 ms) in existing LTE, a period shorter than 1 ms (eg, 1-13 symbols), or a period longer than 1 ms. It may be.
  • the unit representing TTI may be called a slot, a mini slot, or the like instead of a subframe.
  • TTI refers to, for example, the minimum time unit of scheduling in wireless communication.
  • the base station schedules each terminal 20 to allocate radio resources (frequency bandwidth that can be used in each terminal 20, transmission power, etc.) in TTI units.
  • the definition of TTI is not limited to this.
  • the TTI may be a transmission time unit such as a channel-encoded data packet (transport block), a code block, or a code word, or may be a processing unit such as scheduling or link adaptation.
  • the time interval for example, the number of symbols
  • the transport block, code block, code word, etc. may be shorter than the TTI.
  • one or more TTIs may be the minimum time unit for scheduling. Further, the number of slots (number of mini-slots) constituting the minimum time unit of the scheduling may be controlled.
  • a TTI having a time length of 1 ms may be referred to as a normal TTI (TTI in LTE Rel. 8-12), a normal TTI, a long TTI, a normal subframe, a normal subframe, a long subframe, a slot, or the like.
  • TTIs shorter than normal TTIs may be referred to as shortened TTIs, short TTIs, partial TTIs (partial or fractional TTIs), shortened subframes, short subframes, minislots, subslots, slots, and the like.
  • the long TTI (for example, normal TTI, subframe, etc.) may be read as a TTI having a time length of more than 1 ms, and the short TTI (for example, shortened TTI, etc.) is less than the TTI length of the long TTI and 1 ms. It may be read as a TTI having the above TTI length.
  • the resource block (RB) is a resource allocation unit in the time domain and the frequency domain, and may include one or a plurality of continuous subcarriers in the frequency domain.
  • the number of subcarriers contained in the RB may be the same regardless of the numerology, and may be, for example, 12.
  • the number of subcarriers contained in the RB may be determined based on numerology.
  • the time domain of RB may include one or more symbols, and may have a length of 1 slot, 1 mini slot, 1 subframe, or 1 TTI.
  • Each 1TTI, 1 subframe, etc. may be composed of one or a plurality of resource blocks.
  • One or more RBs include a physical resource block (PRB: Physical RB), a sub-carrier group (SCG: Sub-Carrier Group), a resource element group (REG: Resource Element Group), a PRB pair, an RB pair, and the like. May be called.
  • PRB Physical resource block
  • SCG Sub-Carrier Group
  • REG Resource Element Group
  • PRB pair an RB pair, and the like. May be called.
  • the resource block may be composed of one or a plurality of resource elements (RE: Resource Element).
  • RE Resource Element
  • 1RE may be a radio resource area of 1 subcarrier and 1 symbol.
  • Bandwidth part (which may also be called partial bandwidth) may represent a subset of consecutive common resource blocks (RBs) for a certain neurology in a carrier.
  • the common RB may be specified by the index of the RB with respect to the common reference point of the carrier.
  • PRBs may be defined in a BWP and numbered within that BWP.
  • the BWP may include a BWP for UL (UL BWP) and a BWP for DL (DL BWP).
  • UL BWP UL BWP
  • DL BWP DL BWP
  • One or more BWPs may be set in one carrier for the UE.
  • At least one of the configured BWPs may be active, and the UE may not expect to send or receive a given signal / channel outside the active BWP.
  • “cell”, “carrier” and the like in this disclosure may be read as “BWP”.
  • the above-mentioned structures such as wireless frames, subframes, slots, mini slots and symbols are merely examples.
  • the number of subframes contained in a wireless frame the number of slots per subframe or wireless frame, the number of minislots contained within a slot, the number of symbols and RBs contained in a slot or minislot, included in the RB.
  • the number of subcarriers, the number of symbols in the TTI, the symbol length, the cyclic prefix (CP) length, and the like can be changed in various ways.
  • the term "A and B are different” may mean “A and B are different from each other”.
  • the term may mean that "A and B are different from C”.
  • Terms such as “separate” and “combined” may be interpreted in the same way as “different”.
  • the notification of predetermined information (for example, the notification of "being X") is not limited to the explicit one, but is performed implicitly (for example, the notification of the predetermined information is not performed). May be good.
  • the "cycle” may be “periodicity” in English, “period”, “cycle”, or “cycle”. However, it may be "pitch”.
  • PDCCH is an example of a downlink control channel.
  • DMRS is an example of a demodulation reference signal.
  • Base station 110 Transmitter 120 Receiver 130 Setting unit 140 Control unit 20 Terminal 210 Transmitter 220 Receiver 230 Setting unit 240 Control unit 30 Core network 1001 Processor 1002 Storage device 1003 Auxiliary storage device 1004 Communication device 1005 Input device 1006 Output device

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