WO2021157038A1 - Terminal and communication method - Google Patents

Abstract

A terminal (20) is provided with: a reception unit (201) that receives feedback information (Downlink Feedback Information (DFI)) for uplink data transmission by means of a Configured Grant (CG); and a control unit (203) that varies actions related to retransmission of the uplink data in response to the content of response information included in the feedback information. Specifically, the control unit (203) maintains uplink data corresponding to an ACK in a retransmission buffer, without performing retransmission by means of the CG when the response information indicates the ACK.

Description

Terminal and communication method

This disclosure relates to terminals and communication methods.

In the Universal Mobile Telecommunication System (UMTS) network, Long Term Evolution (LTE) has been specified for the purpose of higher data rate and lower latency. In addition, a successor system to LTE is also being studied for the purpose of further widening and speeding up from LTE. The successor systems to LTE include, for example, LTE-Advanced (LTE-A), FutureRadioAccess (FRA), 5thgenerationmobilecommunication system (5G), 5Gplus (5G +), RadioAccessTechnology (New-RAT), New. There is a system called Radio (NR).

In NR, it was agreed to use two grants called Dynamic Grant (DG) and Configured Grant (CG). 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. For example, 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.

DG is also called UL Grant, and 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. When 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.

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.

It was also agreed that when CG is set on the terminal, feedback information called Downlink Feedback Information (DFI) will be transmitted to the terminal. 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)). Note that DFI may be referred to as "CG-DFI" because it is transmitted to the terminal when CG is set in the terminal.

In addition, in the 3rd Generation Partnership Project (3GPP), as one function of Release 16 of NR, specifications for using unlicensed frequency bands that do not require a radio station license if specific conditions are met (5G NR in unlicensed spectrum, 5G NR in unlicensed spectrum, NR-U) is being formulated.

In the NR-U, in the uplink HARQ process, 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.

Further, in the HARQ process, the operation of the terminal when the terminal receives NACK via DFI is defined in Non-Patent Document 1.

However, in the HARQ process, there is room for consideration regarding the operation of the terminal when the terminal receives ACK via DFI.

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.

The terminal according to one aspect of the present disclosure 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.

According to the present disclosure, in the HARQ process, an appropriate operation can be performed when the terminal receives ACK via DFI.

It is a block diagram which shows an example of the structure of a base station. It is a block diagram which shows an example of the configuration of a terminal. It is a figure which shows an example of the hardware composition of a base station and a terminal.

Hereinafter, embodiments will be described with reference to the drawings as appropriate. Unless otherwise specified, the same elements are designated by the same reference numerals throughout the present specification. The matters described below along with the accompanying drawings are for illustration purposes and not for the sole embodiment. For example, when the order of operations is indicated in the embodiment, the order of operations may be appropriately changed as long as there is no contradiction in the overall operation.

When a plurality of embodiments and / or variants are exemplified, some configurations, functions and / or operations in the embodiments and / or variants are, to the extent that there is no contradiction, in other embodiments and / or. It may be included in the modifications and / or replaced with the corresponding configurations, functions and / or operations of other embodiments and / or variants.

Further, in the embodiment, an unnecessarily detailed explanation may be omitted. For example, publicly known or well-known technical matters in order to avoid unnecessarily redundant explanations and / or obscure technical matters or concepts and facilitate understanding by those skilled in the art. The detailed description of the above may be omitted. In addition, duplicate description of substantially the same configuration, function, and / or operation may be omitted.

The accompanying drawings and the following description are provided to aid in understanding the embodiments and are not intended to limit the subject matter described in the claims. In addition, the terms used in the following description may be appropriately read as other terms to aid the understanding of those skilled in the art.

<Knowledge that led to this disclosure>
Hereinafter, the findings leading to this disclosure will be described.

(1) Previous HARQ process Retransmission of lost or erroneous data units is processed by the HARQ process. In the conventional uplink HARQ process, when 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.

(2) Agreement on the HARQ process At the 3GPP meeting, it was agreed that at least the following would be supported for the HARQ process.

First, at RAN1 # 96 of 3GPP, the following matters were agreed.
-Retransmission of HARQ on the CG resource at the expiration of the CG timer (timer activated when transmitting data via the CG resource) is supported.

In addition, the following matters were agreed at RAN2 # 105bis of 3GPP.
• If the 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.

In addition, at RAN2 # 108 of 3GPP, the following matters were agreed.
-Retransmissions can be performed on different CG resources as long as the same HARQ process uses the same Transport Block Size (TBS).

In addition, at RAN1 # 98 of 3GPP, the following matters were agreed.
-Supports at least the following as a CG DFI design.
DFI includes a transport block (TB) level HARQ-ACK bitmap for all UL HARQ processes. Here, the total number of HARQ processes is specified in Release 15. For example, the total number of HARQ processes is 16.

As mentioned above, in CG, if 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.

However, the NR standard does not specify the operation of the terminal when the terminal receives ACK via DFI in CG.

When 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. In order to avoid collision with signals from other terminals, retransmission via resources scheduled by DG (hereinafter referred to as "DG retransmission") may be instructed.

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.

That is, in NR-U, 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. There are two types, 1 and the case where the received data unit has an error and the CG timer is stopped in order to instruct the DG retransmission, and the ACK is transmitted via DFI.

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. In one aspect of the present disclosure, a technique for performing an appropriate operation (for example, data maintenance, non-retransmission) when the terminal receives an ACK via DFI in the HARQ process will be described.

<Base station configuration>
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. For example, the transmission unit 101 transmits a DL signal under the control of the control unit 103. The DL signal may include, for example, DCI. In addition, 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. For example, 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. For example, 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.

<Terminal configuration>
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. For example, the transmission unit 202 transmits a UL signal under the control of the control unit 203. For example, 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. For example, 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.

<HARQ process in the present disclosure>
Next, the HARQ process in the present disclosure will be described.

The autonomous HARQ of the HARQ process is supported in the unlicensed frequency band set in the CG setting.

In the case of autonomous HARQ, the terminal 20 selects the HARQ process identifier from the set pool of HARQ processes.

In the case of autonomous HARQ, 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).

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. Alternatively, 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.

As described above, according to the above-described embodiment, 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.

Specifically, 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.

Further, 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.

As a result, when 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.

(Hardware configuration)
The block diagram used in the description of the above embodiment shows a block of functional units. These functional blocks (components) are realized by any combination of at least one of hardware and software. Further, the method of realizing each functional block is not particularly limited. That is, 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. There are broadcasting, notifying, communicating, forwarding, configuring, reconfiguring, allocating, mapping, assigning, etc., but only these. I can't. For example, a functional block (constituent unit) that makes transmission function is called a transmitting unit (transmitting unit) or a transmitter (transmitter). As described above, the method of realizing each of them is not particularly limited.

For example, 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.

In the following explanation, 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.

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. For example, the above-mentioned control unit 103, control unit 203, and the like may be realized by the processor 1001.

Further, 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. As the program, a program that causes a computer to execute at least a part of the operations described in the above-described embodiment is used. For example, 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. Although the above-mentioned various processes have been described as being executed by one processor 1001, they may be executed simultaneously or sequentially by two or more processors 1001. 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. For example, the transmission unit 101, the reception unit 102, the reception unit 201, the transmission unit 202, and the like described above may be realized by the communication device 1004.

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).

Further, 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.

Further, 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.

(Information notification, signaling)
The notification of information is not limited to the embodiments / embodiments described in the present disclosure, and may be performed by other methods. For example, 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. Further, the 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.

(Applicable system)
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).

(Processing procedure, etc.)
The order of the processing procedures, sequences, flowcharts, etc. of each aspect / embodiment described in the present disclosure may be changed as long as there is no contradiction. For example, the methods described in the present disclosure present elements of various steps using exemplary order, and are not limited to the particular order presented.

(Operation of base station)
In some cases, the specific operation performed by the base station in the present disclosure may be performed by its upper node. In a network consisting of one or more network nodes having a base station, 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.). Although 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).

(Input / output direction)
Information and the like (* see the item "Information, signal") 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.

(Handling of input / output information, etc.)
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.

(Judgment method)
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)
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.

Further, software, instructions, information, etc. may be transmitted and received via 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.). 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.

(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.

Note that the terms explained in the present disclosure and the terms necessary for understanding the present disclosure may be replaced with terms having the same or similar meanings. For example, at least one of a channel and a symbol may be a signal (signaling). Also, the signal may be a message. Further, the component carrier (CC: Component Carrier) may be referred to as a carrier frequency, a cell, a frequency carrier, or the like.

("System", "Network")
The terms "system" and "network" used in this disclosure are used interchangeably.

(Parameter, channel name)
In addition, 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. For example, the radio resource may be one indicated by an index.

The names used for the above parameters are not limited in any respect. Further, mathematical formulas and the like using these parameters may differ from those explicitly disclosed in this disclosure. Since the various channels (eg, PUCCH, PDCCH, etc.) and information elements can be identified by any suitable name, the various names assigned to these various channels and information elements are in any respect limited names. is not it.

(Base station (wireless base station))
In the present disclosure, "Base Station (BS)", "Wireless Base Station", "Fixed Station", "NodeB", "eNodeB (eNB)", "gNodeB (gNB)", ""Accesspoint","transmissionpoint","receptionpoint","transmission / reception point", "cell", "sector", "cell group", Terms such as "carrier" and "component carrier" may 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. When 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.

(Terminal)
In the present disclosure, terms such as "mobile station (MS)", "user terminal", "user equipment (UE)", and "terminal" may be used interchangeably. ..

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.

(Base station / Mobile station)
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. It should be noted that at least one of the base station and the mobile station includes a device that does not necessarily move during communication operation. For example, at least one of a base station and a mobile station may be an IoT (Internet of Things) device such as a sensor.

Further, the base station in the present disclosure may be read by the user terminal. For example, 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.). Each aspect / embodiment of the present disclosure may be applied to the configuration. In this case, the terminal 20 may have the function of the base station 10 described above. In addition, words such as "up" and "down" may be read as words corresponding to communication between terminals (for example, "side"). For example, an uplink channel, a downlink channel, and the like may be read as a side channel.

Similarly, the terminal in the present disclosure may be read as a base station. In this case, the base station 10 may have the functions of the terminal 20 described above.

(Meaning and interpretation of terms)
The terms "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". Also, "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". In addition, "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.

The terms "connected", "coupled", or any variation thereof, mean 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. For example, "connection" may be read as "access". As used in the present disclosure, 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.

The phrase "based on" as used in this disclosure does not mean "based on" unless otherwise stated. In other words, the statement "based on" means both "based only" and "at least based on".

Any reference 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.

The "part" in the configuration of each of the above devices may be replaced with a "means", a "circuit", a "device", or the like.

When "include", "including" and variations thereof are used in the present disclosure, these terms are as comprehensive as the term "comprising". Is intended. Furthermore, the term "or" used in the present disclosure is intended not to be an exclusive OR.

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. 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.

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.

For example, 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. 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.

Here, TTI refers to, for example, the minimum time unit of scheduling in wireless communication. For example, in the LTE system, 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. When a TTI is given, the time interval (for example, the number of symbols) to which the transport block, code block, code word, etc. are actually mapped may be shorter than the TTI.

When one slot or one minislot is called TTI, one or more TTIs (that is, one or more slots or one or more minislots) 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.

Further, 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.

Further, the resource block may be composed of one or a plurality of resource elements (RE: Resource Element). For example, 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. Here, 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). 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. In addition, "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. For example, 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.

In the present disclosure, if articles are added by translation, for example, a, an and the in English, the disclosure may include that the nouns following these articles are plural.

In the present disclosure, 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".

(Variations of modes, etc.)
Each aspect / embodiment described in the present disclosure may be used alone, in combination, or switched with execution. Further, 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.

Although the present disclosure has been described in detail above, it is clear to those skilled in the art that the present disclosure is not limited to the embodiments described in the present disclosure. The present disclosure may be implemented as an amendment or modification without departing from the purpose and scope of the present disclosure, which is determined by the description of the scope of claims. Therefore, the description of the present disclosure is for the purpose of exemplary explanation and does not have any limiting meaning to the present disclosure.

One aspect of the present disclosure is useful, for example, in a wireless communication system.

10 Base station 20 Terminal 101, 202 Transmitter 102, 201 Receiver 103, 203 Control

Claims (5)

1. A receiver that receives feedback information for uplink data transmission by Configured Grant (CG),
   A control unit that makes the operation related to retransmission of uplink data different depending on the content of the response information included in the feedback information.
   A terminal equipped with.
2. When the response information indicates ACK, the control unit maintains uplink data corresponding to the ACK in the retransmission buffer.
   The terminal according to claim 1.
3. When the response information indicates ACK, the control unit does not perform retransmission by the CG.
   The terminal according to claim 2.
4. When the response information indicates NACK, the control unit performs non-adaptive retransmission using the same resource as the setting resource used for the previous uplink data transmission and a resource different from the setting resource used for the previous uplink data transmission. Perform one of the adaptive retransmissions used,
   The terminal according to claim 2 or 3.
5. The terminal is
   Receive feedback information for uplink data transmission by Configured Grant (CG),
   The operation related to the retransmission of uplink data differs depending on the content of the response information included in the feedback information.
   Communication method.

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