WO2021157038A1 - Terminal et procédé de communication - Google Patents

Terminal et procédé de communication Download PDF

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Publication number
WO2021157038A1
WO2021157038A1 PCT/JP2020/004685 JP2020004685W WO2021157038A1 WO 2021157038 A1 WO2021157038 A1 WO 2021157038A1 JP 2020004685 W JP2020004685 W JP 2020004685W WO 2021157038 A1 WO2021157038 A1 WO 2021157038A1
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WIPO (PCT)
Prior art keywords
terminal
retransmission
base station
uplink data
resource
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PCT/JP2020/004685
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English (en)
Japanese (ja)
Inventor
慎也 熊谷
聡 永田
高橋　秀明
リフェ ワン
ギョウリン コウ
Original Assignee
株式会社Ｎｔｔドコモ
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Application filed by 株式会社Ｎｔｔドコモ filed Critical 株式会社Ｎｔｔドコモ
Priority to PCT/JP2020/004685 priority Critical patent/WO2021157038A1/fr
Publication of WO2021157038A1 publication Critical patent/WO2021157038A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W28/00—Network traffic management; Network resource management
    • H04W28/02—Traffic management, e.g. flow control or congestion control
    • H04W28/04—Error control
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W74/00—Wireless channel access
    • H04W74/08—Non-scheduled access, e.g. ALOHA

Definitions

  • This disclosure relates to terminals and communication methods.
  • LTE Long Term Evolution
  • FAA FutureRadioAccess
  • 5G 5thgenerationmobilecommunication system
  • 5G + 5thgenerationmobilecommunication system
  • New-RAT RadioAccessTechnology
  • NR Radio
  • DG and CG are information regarding scheduling of signal transmission in a terminal, for example, at least one of DG and CG schedules an uplink (UPlink, UL) channel.
  • the uplink channel includes a Physical Uplink Shared Channel (PUSCH) used for transmitting data and a Physical Uplink Control Channel (PUCCH) used for transmitting control information.
  • PUSCH Physical Uplink Shared Channel
  • PUCCH Physical Uplink Control Channel
  • DG is also called UL Grant
  • the terminal sends a scheduling request (SR), which is a signal requesting uplink resource allocation, to the base station, and the uplink data is transmitted by the PUSCH resource allocated by the base station. It is a method of transmitting.
  • SR scheduling request
  • the base station receives the SR, the base station performs scheduling, includes information indicating the scheduling result in control information (for example, Downlink Control Information (DCI)), and transmits the information to the terminal.
  • DCI Downlink Control Information
  • CG is a method in which a PUSCH resource is allocated to each terminal in advance, and the terminal autonomously transmits uplink data using the PUSCH resource without performing SR transmission.
  • the PUSCH resource scheduled by DG may be referred to as DG PUSCH or DG resource.
  • the PUSCH resource scheduled by CG may be referred to as CG PUSCH or CG resource.
  • DFI Downlink Feedback Information
  • the DFI includes, for example, response information to the PUSCH in the uplink Hybrid Automatic Repeat reQuest (HARQ) process (hereinafter, may be referred to as “HARQ-ACK”).
  • the response information includes, for example, an acknowledgment (ACK) or a negative response (Negative Acknowledgement (NACK)).
  • ACK acknowledgment
  • NACK Negative Acknowledgement
  • the retransmission of the data unit transmitted via the CG resource is scheduled by autonomous non-adaptive retransmission (Autonomous HARQ) via the same CG resource and DG. Both adaptive retransmissions over resources are supported.
  • Non-Patent Document 1 the operation of the terminal when the terminal receives NACK via DFI is defined in Non-Patent Document 1.
  • One of the purposes of the present disclosure is to perform an appropriate operation (for example, data maintenance, non-retransmission) when the terminal receives ACK via DFI in the HARQ process.
  • an appropriate operation for example, data maintenance, non-retransmission
  • the terminal differs between the receiving unit that receives the feedback information for the uplink data transmission by the Configured Grant (CG) and the operation related to the retransmission of the uplink data according to the content of the response information included in the feedback information. It is provided with a control unit and a control unit.
  • CG Configured Grant
  • an appropriate operation can be performed when the terminal receives ACK via DFI.
  • Previous HARQ process Retransmission of lost or erroneous data units is processed by the HARQ process.
  • the terminal starts the timer at the transmission timing of the data unit and receives NACK from the base station, or when the timer expires, the data unit is retransmitted and the timer is executed. If ACK is received from the base station before the expiration of, a new data unit is transmitted and the transmitted data is deleted from the HARQ buffer.
  • Transport Block (TB) was previously transmitted or retransmitted using a resource scheduled by DG, then retransmission of TB using the CG resource is not allowed.
  • -Retransmissions can be performed on different CG resources as long as the same HARQ process uses the same Transport Block Size (TBS).
  • TBS Transport Block Size
  • DFI includes a transport block (TB) level HARQ-ACK bitmap for all UL HARQ processes.
  • TB transport block
  • HARQ processes the total number of HARQ processes is specified in Release 15.
  • the total number of HARQ processes is 16.
  • the terminal receives a NACK via DFI after the CG timer is (re) activated, or DG for the terminal to schedule the retransmission of DFI and / or a particular HARQ process.
  • the operation of the terminal when it does not receive is already specified in the NR standard. That is, in the above case, the terminal autonomously initiates the retransmission of the first transmitted HARQ process via the CG mechanism for NR-U.
  • the NR standard does not specify the operation of the terminal when the terminal receives ACK via DFI in CG.
  • the base station instructs the retransmission of the data unit transmitted via the CG resource
  • the base station instructs the autonomous retransmission of the terminal via the same CG resource (hereinafter, referred to as "CG retransmission"), and the case where the base station instructs the retransmission of the data unit.
  • CG retransmission CG resource
  • DG retransmission resources scheduled by DG
  • the base station When instructing CG retransmission, the base station transmits NACK to the terminal via DFI. On the other hand, when instructing DG retransmission, the base station transmits ACK to the terminal via DFI in order to stop the CG timer for the purpose of preventing CG retransmission due to the expiration of the CG timer.
  • the pattern in which the base station transmits ACK is a pattern in which there is no error in the received data unit and an instruction to transmit a new data unit is instructed, and ACK is transmitted without going through DFI.
  • the terminal When the terminal always erases the transmitted data from the HARQ buffer when the terminal receives the ACK, when the base station transmits the ACK in the pattern 2, the data to be retransmitted at the time of DG retransmission is already performed. Will be lost.
  • the present inventor paid attention to this problem and came to make the present disclosure.
  • an appropriate operation for example, data maintenance, non-retransmission
  • FIG. 1 is a block diagram showing an example of the configuration of the base station 10.
  • the base station 10 includes, for example, a transmission unit 101, a reception unit 102, and a control unit 103.
  • the base station 10 wirelessly communicates with the terminal 20 (see FIG. 2).
  • the transmission unit 101 transmits a downlink (DL) signal to the terminal 20.
  • the transmission unit 101 transmits a DL signal under the control of the control unit 103.
  • the DL signal may include, for example, DCI.
  • DFI may include DFI.
  • the DFI may include response information regarding an acknowledgment to a signal transmitted from the terminal 20.
  • the receiving unit 102 receives the uplink (UL) signal transmitted from the terminal 20.
  • the receiving unit 102 receives the UL signal under the control of the control unit 103.
  • the control unit 103 controls the communication operation of the base station 10, including the transmission process of the transmission unit 101 and the reception process of the reception unit 102.
  • the control unit 103 receives data, control information, and the like from the upper layer and outputs the data to the transmission unit 101. Further, the control unit 103 outputs the data received from the reception unit 102, the control information, and the like to the upper layer.
  • FIG. 2 is a block diagram showing an example of the configuration of the terminal 20.
  • the terminal 20 includes, for example, a receiving unit 201, a transmitting unit 202, and a control unit 203.
  • the terminal 20 wirelessly communicates with the base station 10, for example.
  • the receiving unit 201 receives the DL signal transmitted from the base station 10. For example, the receiving unit 201 receives the DL signal under the control of the control unit 203.
  • the transmission unit 202 transmits the UL signal to the base station 10.
  • the transmission unit 202 transmits a UL signal under the control of the control unit 203.
  • the transmission unit 202 transmits a UL signal using DG PUSCH and / or CG PUSCH.
  • the control unit 203 controls the communication operation of the terminal 20, including the reception process in the reception unit 201 and the transmission process in the transmission unit 202.
  • the control unit 203 receives data, control information, and the like from the upper layer and outputs the data to the transmission unit 202. Further, the control unit 203 outputs, for example, the data received from the reception unit 201, the control information, and the like to the upper layer.
  • the autonomous HARQ of the HARQ process is supported in the unlicensed frequency band set in the CG setting.
  • the terminal 20 selects the HARQ process identifier from the set pool of HARQ processes.
  • the downlink ACK / NACK according to the uplink (re) transmission result is a cyclic redundancy check (Cyclic Redundancy Check) scrambled by the Configure Scheduling Radio-Network Temporary Identifier (CS-RNTI). It is transmitted by PDCCH using CRC).
  • Cyclic Redundancy Check Configure Scheduling Radio-Network Temporary Identifier
  • HARQ operation in the uplink is managed according to the following principles. 1. 1. Regardless of the content of the HARQ feedback information (ACK or NACK), when the PDCCH is correctly received by the terminal 20, the terminal 20 executes what the PDCCH requests from the terminal 20, that is, transmission or retransmission (called adaptive retransmission). do. 2. When CG downlink feedback information (CG-DFI) is detected in PDCCH using CRC scrambled by CS-RNTI, the HARQ feedback information indicates how the terminal 20 performs retransmission. NACK: The terminal 20 executes non-adaptive retransmission, that is, retransmission with the same CG resource.
  • CG-DFI CG downlink feedback information
  • the terminal 20 performs adaptive retransmission, that is, retransmission with a configured uplink resource different from the uplink resource previously used by the same process, as long as it is the same TBS with the same HARQ process.
  • ACK The terminal 20 does not execute the (re) transmission of the uplink and holds the data in the HARQ buffer. At that time, PDCCH is required to execute retransmission. That is, no non-adaptive retransmission is performed.
  • the terminal 20 when the terminal 20 receives the feedback information (DFI) for the uplink data transmission by the CG, the terminal 20 retransmits the uplink data according to the content of the response information included in the feedback information. Behave differently.
  • DFI feedback information
  • the terminal 20 when the terminal 20 receives NACK via DFI, the terminal 20 performs non-adaptive retransmission using the same resource as the setting resource used for the previous uplink data transmission, and the setting resource used for the previous uplink data transmission. Either adaptive retransmission or adaptive retransmission using a resource different from the above is performed.
  • the terminal 20 when the terminal 20 receives the ACK via DFI and receives the ACK via DFI, the terminal 20 does not perform CG retransmission and maintains the transmitted data without erasing it from the HARQ buffer.
  • the base station 10 instructs the terminal 20 to retransmit the DG after transmitting the ACK via the DFI
  • the data to be retransmitted is maintained in the HARQ buffer of the terminal 20, so that the data to be retransmitted is maintained in the HARQ process.
  • the terminal 20 can perform an appropriate operation.
  • 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 only these.
  • a functional block that makes transmission function is called a transmitting unit (transmitting unit) or a transmitter (transmitter).
  • transmitting unit transmitting unit
  • transmitter transmitter
  • the base station, terminal, etc. in the embodiment of the present disclosure may function as a computer that processes the wireless communication method of the present disclosure.
  • FIG. 4 is a diagram showing an example of the hardware configuration of the base station and the terminal according to the embodiment of the present disclosure.
  • the base station 10 and the terminal 20 may be physically configured as a computer device including a processor 1001, a memory 1002, a storage 1003, a communication device 1004, an input device 1005, an output device 1006, a bus 1007, and the like.
  • 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 FIG. 4, 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 memory 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 memory 1002 and the storage 1003.
  • Processor 1001 operates, for example, an operating system to control the entire computer.
  • the processor 1001 may be configured by 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 103, control unit 203, and the like may be realized by the processor 1001.
  • the processor 1001 reads a program (program code), a software module, data, etc. from at least one of the storage 1003 and the communication device 1004 into the memory 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 103 of the base station 10 or the control unit 203 of the terminal 20 may be realized by a control program stored in the memory 1002 and operating in the processor 1001, or may be realized in the same manner for other functional blocks. good.
  • Processor 1001 may be implemented by one or more chips.
  • the program may be transmitted from the network via a telecommunication line.
  • the memory 1002 is a computer-readable recording medium, and is composed of at least one such as a ROM (Read Only Memory), an EPROM (Erasable Programmable ROM), an EPROM (Electrically Erasable Programmable ROM), and a RAM (Random Access Memory). May be done.
  • the memory 1002 may be referred to as a register, a cache, a main memory (main storage device), or the like.
  • the memory 1002 can store a program (program code), a software module, or the like that can be executed to implement the wireless communication method according to the embodiment of the present disclosure.
  • the storage 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, or a Blu-ray). It may consist of at least one (registered trademark) disk), smart card, flash memory (eg, card, stick, key drive), floppy (registered trademark) disk, magnetic strip, and the like.
  • the storage 1003 may be referred to as an auxiliary storage device.
  • the storage medium described above may be, for example, a database, server or other suitable medium containing at least one of the memory 1002 and the storage 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 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 memory 1002 is connected by the 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
  • information notification includes physical layer signaling (for example, DCI (Downlink Control Information), UCI (Uplink Control Information)), upper layer signaling (for example, RRC (Radio Resource Control) signaling, MAC (Medium Access Control) signaling, etc. It may be carried out by notification information (MIB (Master Information Block), SIB (System Information Block)), other signals, or a combination thereof.
  • RRC signaling may be referred to as an RRC message, and may be, for example, an RRC Connection Setup message, an RRC Connection Reconfiguration 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®), LTE 802.20, UWB (Ultra-WideBand), Bluetooth®, and other systems that utilize and extend 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 in the present disclosure may be performed by its upper node.
  • various operations performed for communication with the terminal are performed by the base station and other network nodes other than the base station (for example, MME or). It is clear that it can be done by at least one of (but not limited to, S-GW, etc.).
  • S-GW network node
  • the case where there is one network node other than the base station is illustrated above, it may be a combination of a plurality of other network nodes (for example, MME and S-GW).
  • Information and the like 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, a 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 may be made by a value represented by 1 bit (0 or 1), by a boolean value (Boolean: true or false), or by comparing numerical values (for example, a predetermined value). It may be done by comparison with the 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, executables, 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, twisted pair, digital subscriber line (DSL: Digital Subscriber Line), etc.) and wireless technology (infrared, microwave, etc.).
  • wired technology coaxial cable, fiber optic cable, twisted pair, digital subscriber line (DSL: Digital Subscriber Line), etc.
  • wireless technology infrared, microwave, etc.
  • Information, signal The information, signals, etc. described in the present disclosure may be represented using any of a variety of different techniques. For example, 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
  • 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 wireless base station
  • Base Station Wireless Base Station
  • NodeB Wireless Base Station
  • eNodeB eNodeB
  • gNodeB gNodeB
  • 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” refers to part or all of the coverage area of at least one of the base stations and base station subsystems that provide communication services in this coverage.
  • Mobile stations can be used by those skilled in the art as 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. 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 referred to as 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 a base station and a 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 user terminals (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 communication between terminals (for example, "side”).
  • an uplink channel, a downlink channel, and the like may be read as a side channel.
  • the terminal in the present disclosure may be read as a base station.
  • the base station 10 may have the functions of the terminal 20 described above.
  • determining and “determining” as used in this disclosure may include a wide variety of actions.
  • “Judgment” and “decision” are, for example, judgment, calculation, computing, processing, deriving, investigating, 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
  • 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. 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 "means”, 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 is independent of 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 interval (SCS: SubCarrier Spacing), bandwidth, symbol length, cyclic prefix length, transmission time interval (TTI: Transmission Time Interval), number of symbols per TTI, radio frame configuration, transmission / reception.
  • SCS SubCarrier Spacing
  • TTI Transmission Time Interval
  • At least one of a specific filtering process performed by the machine in the frequency domain, a specific windowing process performed by the transceiver 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 unit of time 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. Further, the mini slot may 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 the 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), a plurality of consecutive subframes may be called TTI, and one slot or one minislot may be called TTI.
  • TTI transmission time interval
  • 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 user terminal to allocate radio resources (frequency bandwidth that can be used in each user terminal, 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 the 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.
  • the bandwidth part (BWP: 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. good.
  • 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, minislots 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 in a slot, the number of symbols and RBs contained in a slot or minislot, and the number of RBs.
  • the number of subcarriers, the number of symbols in the TTI, the symbol length, the cyclic prefix (CP: Cyclic Prefix) length, and other configurations 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”.
  • each aspect / embodiment described in the present disclosure may be used alone, in combination, or switched with execution.
  • 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.
  • One aspect of the present disclosure is useful, for example, in a wireless communication system.
  • Base station 20 Terminal 101, 202 Transmitter 102, 201 Receiver 103, 203 Control

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

Abstract

Terminal (20) pourvu : d'une unité de réception (201) qui reçoit des informations de rétroaction (informations de rétroaction de liaison descendante [DFI]) pour la transmission de données de liaison montante au moyen d'une autorisation configurée (CG); et d'une unité de commande (203) qui fait varier des actions liées à la retransmission des données de liaison montante en réponse au contenu d'informations de réponse incluses dans les informations de rétroaction. En particulier, l'unité de commande (203) maintient des données de liaison montante correspondant à un ACK dans un tampon de retransmission, sans réaliser de retransmission au moyen de la CG lorsque les informations de réponse indiquent l'ACK.
PCT/JP2020/004685 2020-02-06 2020-02-06 Terminal et procédé de communication WO2021157038A1 (fr)

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Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
NOKIA ET AL.: "On support of UL transmission with configured grants in NR-U", 3GPP TSG RAN WG1 #98B R1-1910595, 14 October 2019 (2019-10-14), XP051789389, Retrieved from the Internet <URL:https://www.3gpp.org/ftp/tsg_ran/WGl_RLl/TSGRl_98b/Docs/R1-1910595.zip> *
QUALCOMM INCORPORATED: "Enhancement to configured grants in NR unlicensed", 3GPP TSG RAN WG1 #99 R1-1912941, 18 November 2019 (2019-11-18), XP051823704, Retrieved from the Internet <URL:https://www.3gpp.org/ftp/tsg_ran/WG1_RL1/TSGR1_99/Docs/R1-1912941.zip> *

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