Method, device and system for transmitting physical uplink control channel in wireless communication system

Abstract

To provide a method for transmitting uplink control information in a wireless communication system, particularly a cellular wireless communication system, and a device therefor.SOLUTION: The present specification relates to a method, a device, and a system for transmitting a physical uplink control channel in a wireless communication system. The present specification discloses a terminal comprising: a communication module for receiving, from a base station, information on a PUCCH serving cell, which is a serving cell on which a PUCCH is to be transmitted, generating the PUCCH, and transmitting the generated PUCCH on the PUCCH serving cell; and a processor for configuring the PUCCH serving cell on the basis of the information on the PUCCH serving cell. The terminal can effectively transmit uplink control information.SELECTED DRAWING: Figure 26

Description

Technical Field

[0001] The present invention relates to a wireless communication system, and more particularly, to a method, apparatus, and system for transmitting a physical uplink control channel in a wireless communication system, and a semi-persistent scheduling PDSCH reception method and a HARQ-ACK transmission method.

Background Art

[0002] After the commercialization of the 4G (4th generation) communication system, efforts have been made to develop a new 5G (5th generation) communication system to meet the increasing demand for wireless data traffic. The 5G communication system is referred to as a communication system beyond the 4G network, a system post LTE, or an NR (new radio) system. To achieve a high data transmission rate, the 5G communication system includes a system operated using a millimeter wave (mmWave) band of 6 GHz or higher, and also includes a communication system operated using a frequency band of 6 GHz or lower from the aspect of ensuring coverage, and the implementation at the base station and the terminal is considered.

[0003] The 3GPP (registered trademark, the same hereinafter) (3rd generation partnership project) NR system improves the efficiency of the network spectrum so that a communication carrier can provide more data and voice services with the given bandwidth. Therefore, the 3GPP NR system is designed to meet the requirements for high-speed data and media transmission in addition to supporting large-capacity voice. The advantages of the NR system are high throughput, low latency, FDD (frequency division duplex), and TDD (time division duplex) support on the same platform, an improved end-user environment, and a simple architecture with low operating costs.

[0004] For more efficient data processing, dynamic TDD in the NR system can use a method of varying the number of OFDM (orthogonal frequency division multiplexing) symbols available for the uplink and downlink according to the data traffic directions of the users in the cell. For example, when the downlink traffic of the cell is higher than the uplink traffic, the base station can allocate a larger number of downlink OFDM symbols to a slot (or subframe). Information regarding the slot configuration needs to be transmitted to the terminal.

[0005] In order to mitigate the path loss of radio waves and increase the transmission distance of radio waves in the extremely high frequency band, beamforming, massive multiple-input multiple-output (massive MIMO), full-dimension multiple-input multiple-output (full dimension MIMO, FD-MIMO), array antenna, analog beamforming, hybrid beamforming that combines analog beamforming and digital beamforming, and large-scale antenna technology are being discussed in the 5G communication system. In addition, in order to improve the system network, evolved small cells, advanced small cells, cloud radio access network (cloud RAN), ultra-dense network, device-to-device communication (D2D), vehicle-to-everything communication (V2X), wireless backhaul, non-terrestrial network communication (NTN), moving network, cooperative communication, coordinated multi-points (CoMP), and interference cancellation technologies are being developed in the 5G communication system.In addition, in the 5G system, advanced coding modulation (ACM) methods such as FQAM (hybrid FSK and QAM modulation) and SWSC (sliding window superposition coding), as well as advanced access technologies such as FBMC (filter bank multi-carrier), NOMA (non-orthogonal multiple access), and SCMA (sparse code multiple access) have been developed.

[0006] On the other hand, the Internet is evolving from a human-centered connection network where humans generate and consume information to an IoT (Internet of Things, Internet of Things) network that exchanges and processes information among distributed components such as things. IoE (Internet of Everything) technology, which combines big data processing technology and others through connection to cloud servers and the like, has also emerged. To implement IoT, technical elements such as sensing technology, wired and wireless communication and network infrastructure, service interface technology, and security technology are required. Recently, technologies such as sensor networks for connecting things, machine to machine (M2M), and MTC (machine type communication) have been studied. In the IoT environment, intelligent IT (internet technology) services that collect and analyze data generated from connected things to create new value for human life are provided. IoT is applied to fields such as smart homes, smart buildings, smart cities, smart cars or connected cars, smart grids, healthcare, smart home appliances, and advanced medical services through the integration and combination of conventional IT technologies and various industries.

[0007] Therefore, various attempts have been made to apply the 5G communication system to the IoT network. For example, technologies such as sensor networks, machine-to-machine, and MTC are realized by techniques such as beamforming, MIMO, and array antennas, which are 5G communication technologies. The application of cloud radio access network (cloud RAN) as the above-mentioned big data processing technology can also be cited as an example of the integration of 5G technology and IoT technology. Generally, mobile communication systems have been developed to provide voice services while ensuring the mobility of users.

[0008] Such mobile communication systems have gradually expanded their scope from voice services to data services and have now developed to the extent that they can provide high-speed data services. However, in the current mobile communication systems where services are provided, due to the shortage of resources and the high-speed service requirements of users, a more advanced mobile communication system is desired.

Summary of the Invention

Problems to be Solved by the Invention

[0009] The technical problem of the present invention is to provide an uplink control information transmission method and an apparatus therefor in a wireless communication system, particularly in a cellular wireless communication system.

[0010] Another technical problem of the present invention is to provide a method for receiving SPS PDSCH and a method for transmitting HARQ-ACK of the SPS PDSCH and an apparatus therefor in the 3GPP NR system.

Means for Solving the Problems

[0011] According to one aspect of the present invention, a terminal for transmitting a physical uplink control channel (PUCCH) based on carrier aggregation is provided. The terminal includes a communication module that receives information about a PUCCH serving cell, which is a serving cell on which the PUCCH is transmitted, from a base station, generates the PUCCH, and transmits the generated PUCCH on the PUCCH serving cell, and a processor that configures the PUCCH serving cell based on the information about the PUCCH serving cell. The information about the PUCCH serving cell may include first information indicating whether to set a specific serving cell among the plurality of serving cells as the PUCCH serving cell, and second information regarding a period to which the setting related to the PUCCH serving cell is applied.

[0012] In one aspect, the first information may indicate whether to set the specific serving cell as the PUCCH serving cell by a series of indexes.

[0013] In another aspect, the number of the series of indexes is determined based on a subcarrier spacing (SCS) of any one cell, where the any one cell is one of the plurality of serving cells, and each index included in the series of indexes may correspond to one slot of the any one cell.

[0014] In still another aspect, the any one cell may be a primary serving cell among the plurality of serving cells.

[0015] In still another aspect, the number of the series of indexes is determined based on a subcarrier spacing (SCS), and each index included in the series of indexes may correspond to one slot according to the subcarrier spacing.

[0016] In yet another aspect, the sub-carrier spacing may be the smallest among the sub-carrier spacings of the plurality of serving cells.

[0017] In yet another aspect, the sub-carrier spacing may be the largest among the sub-carrier spacings of the plurality of serving cells.

[0018] In yet another aspect, the terminal has a TDD configuration set from a higher layer, and the sub-carrier spacing may be the reference sub-carrier spacing of the TDD configuration.

[0019] In yet another aspect, the series of indexes may correspond to at least some of the slots within the period.

[0020] In yet another aspect, the uplink slot of the primary serving cell is not included in the at least some of the slots, and the uplink slot may be a slot including only uplink symbols.

[0021] In yet another aspect, when all of the plurality of serving cells are downlink slots, the slot is not included in the at least some of the slots, and the downlink slot may include only downlink symbols.

[0022] In yet another aspect, the first information may indicate, on a per-slot basis, whether to set the specific serving cell as the PUCCH serving cell.

[0023] In yet another aspect, the plurality of serving cells includes a primary serving cell and at least one secondary serving cell, and the specific serving cell may be a secondary serving cell having the lowest cell index among the at least one secondary serving cell.

[0024] In yet another aspect, the information regarding the PUCCH serving cell may further include third information regarding an offset at which the period starts.

[0025] In yet another aspect, the communication module transmits the generated PUCCH based on a time division duplex (TDD) configuration, the information regarding the PUCCH serving cell is information regarding the TDD configuration, and a period to which the setting regarding the PUCCH serving cell is applied may be determined based on a period set in the TDD configuration.

[0026] In yet another aspect, the TDD configuration may be one of a TDD configuration regarding a primary serving cell, a TDD configuration regarding a serving cell having the lowest subcarrier spacing among the plurality of serving cells, or a TDD configuration regarding a serving cell having the highest subcarrier spacing among the plurality of serving cells.

[0027] In yet another aspect, when the generated PUCCH is configured with PUCCH repetition, the communication module performs the PUCCH repetition starting from a first slot in which the PUCCH repetition is indicated, determines the PUCCH serving cell for transmitting the PUCCH repetition in the first slot according to the first information, and the PUCCH repetitions after the first slot may be transmitted on the PUCCH serving cell when the PUCCH serving cell is indicated by the first information.

[0028] In yet another aspect, when the generated PUCCH is configured with PUCCH repetition, the communication module determines the PUCCH serving cell at each slot in which the PUCCH repetition is transmitted according to the first information, and the PUCCH repetition may be transmitted on the PUCCH serving cell at each slot.

[0029] In yet another aspect, the communication module is configured to receive a physical downlink shared channel (PDSCH) from the base station in a slot that is k1 reference slots earlier than the slot in which the generated PUCCH is transmitted. The generated PUCCH includes a HARQ (Hybrid Automatic Repeat request) ACK regarding the PDSCH. The time length of the reference slot may be determined based on any one of the subcarrier spacing of the primary serving cell, the largest subcarrier spacing among a plurality of serving cells, and the smallest subcarrier spacing among the plurality of serving cells.

[0030] In yet another aspect, the communication module is configured to receive a PUCCH resource indicator for indicating a PUCCH resource from the base station. When there are multiple specific serving cells that can be set as the PUCCH serving cell, the processor may determine, among the multiple specific serving cells, the serving cell that can use the PUCCH resource as the PUCCH serving cell.

[0031] According to another aspect of the present invention, there is provided a terminal that performs communication based on semi-persistent scheduling. The terminal receives a first physical downlink shared channel (PDSCH) from a base station according to a first semi-persistent scheduling, generates a HARQ (Hybrid Automatic Repeat request) ACK for reception of the first PDSCH, and is configured to transmit the HARQ ACK at a transmission timing of a PUCCH determined by a processor. The communication module is configured to perform transmission and reception operations according to a plurality of semi-persistent schedulings including the first semi-persistent scheduling. When a resource of a first PUCCH associated with and allocated to the first PDSCH is unavailable for use as the PUCCH, the processor may be configured to determine the transmission timing of the PUCCH based on a resource of a second PUCCH in a second slot available for use as the PUCCH.

[0032] In one aspect, when a resource of a first PUCCH is unavailable for use as the PUCCH, it may include a case where the resource of the first PUCCH overlaps with at least one of at least one downlink symbol, at least one symbol of a synchronization signal block, at least one symbol of a basic control channel resource (CORESET #0), and an invalid uplink symbol.

[0033] In another aspect, the communication module is configured to receive a second PDSCH according to the first semi-persistent scheduling after the first PDSCH. Resources of the second slot and the second PUCCH are associated with and allocated to the second PDSCH, and the transmission timing of the PUCCH may include an uplink slot.

[0034] In yet another aspect, the resources of the second slot and the second PUCCH may be associated with a PDSCH according to a predetermined specific semi-persistent scheduling among the plurality of semi-persistent schedulings.

[0035] In yet another aspect, the predetermined specific semi-persistent scheduling may be any one of a semi-persistent scheduling configuration having the lowest ID, a semi-persistent scheduling configuration having the shortest period, and a semi-persistent scheduling configuration having the same or lower priority as the first semi-persistent scheduling among the plurality of semi-persistent schedulings.

[0036] In yet another aspect, the PUCCH is composed of PUCCH repetitions, and when the difference between the second slot and the first slot is the same as or smaller than a certain constant value, the processor can determine that the transmission timing of the PUCCH is valid.

[0037] In yet another aspect, the first slot is the first slot to which a PUCCH repetition is assigned, and the second slot may be a slot in which the PUCCH repetition can be transmitted.

[0038] In yet another aspect, the first slot is the first slot to which a PUCCH repetition is assigned, and the second slot may be the first slot among the slots in which the PUCCH repetition can be transmitted.

[0039] In yet another aspect, the first slot is the first slot to which a PUCCH repetition is assigned, and the second slot may be each slot in which each PUCCH repetition can be transmitted.

[0040] In yet another aspect, the first slot is the first slot to which a PUCCH repetition is assigned, and the second slot may be the last slot among the slots in which each PUCCH repetition can be transmitted.

[0041] In yet another aspect, the first slot is the n-th slot among the slots to which PUCCH repetitions are allocated, the second slot is the n-th slot among the slots in which each PUCCH repetition can be transmitted, and the n may be a natural number from 1 to the number of repetitions of the PUCCH repetition.

Advantages of the Invention

[0042] According to an embodiment of the present invention, a terminal can accurately transmit uplink control information to a base station via an uplink control channel. In addition, the uplink control information can be effectively transmitted by accurately transmitting the physical uplink control channel. Further, according to the present invention, a terminal can effectively determine a PUCCH resource for HARQ-ACK transmission due to reception of SPS PDSCH and transmit HARQ-ACK of the SPS PDSCH.

[0043] The effects obtained from the present invention are not limited to the effects mentioned above, and other effects not mentioned will be clearly understood by those of ordinary skill in the technical field to which the present invention pertains from the following description.

Brief Description of the Drawings

[0044]

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Embodiments for Carrying Out the Invention

[0045] The terms used in this specification are chosen to be as general as currently widely used, taking into account the functions in the present invention. However, this may vary depending on the intentions, conventions of those skilled in the art, or the emergence of new technologies. In some specific cases, there are also terms arbitrarily selected by the applicant. In such cases, the meaning is described in the corresponding invention description part. Therefore, it is clarified that the terms used in this specification should be interpreted based not only on the names of the terms but also on the substantial meanings they have and the content throughout this specification.

[0046] Throughout the specification, when it is stated that a certain configuration is "connected" to another configuration, this includes not only the case of being "directly connected" but also being "electrically connected" via other intervening components. Also, when a certain configuration "includes" a specific component, this means that, unless otherwise stated to the contrary, it does not exclude other components but further includes other components. In addition, the limiting terms "above" or "below" based on a specific threshold may be appropriately replaced by "more than" or "less than" respectively according to the examples.

[0047] The following technologies are used in various wireless connection systems such as CDMA (code division multiple access), FDMA (frequency division multiple access), TDMA (time division multiple access), OFDMA (orthogonal frequency division multiple access), SC-FDMA (single carrier frequency division multiple access), etc. CDMA is implemented by wireless technologies such as UTRA (Universal Terrestrial Radio Access) and CDMA2000. TDMA is implemented by wireless technologies such as GSM (Global System for Mobile communications) / GPRS (General Packet Radio Service) / EDGE (Enhanced Data Rates for GSM Evolution). OFDMA is implemented by wireless technologies such as IEEE802.11 (Wi-Fi), IEEE802.16 (WiMAX), IEEE802-20, E-UTRA (Evolved UTRA), etc. UTRA is part of UMTS (Universal Mobile Telecommunication System). 3GPP LTE (Long term evolution) is part of E-UMTS (Evolved UMTS) that uses E-UTRA, and LTE-A (Advanced) is an evolved version of 3GPP LTE. 3GPP NR is a system designed separately from LTE / LTE-A and is a system for supporting the eMBB (enhanced Mobile BroadBand), URLLC (Ultra-Reliable and Low Latency Communication), and mMTC (massive Machine Type Communication) services that are requirements of IMT-2020. Although the explanation will focus on 3GPP NR for clarity, the technical idea of the present invention is not limited to this.

[0048] Unless otherwise specified in this specification, the base station may include a gNB (next generation node B) defined in 3GPP NR. Also, unless otherwise specified, the terminal may include a UE (user equipment). Hereinafter, for the sake of helping the understanding of the description, each content will be described in individual embodiments, but the respective embodiments may be used in combination with each other. In the present disclosure, configuring the terminal may mean configuring by the base station. Specifically, the base station can transmit a channel or a signal to the terminal to configure the operation of the terminal or the value of a parameter used in the wireless communication system.

[0049] FIG. 1 is a diagram showing an example of a radio frame structure used in a wireless communication system.

[0050] Referring to FIG. 1, the radio frame (or radio frame) used in the 3GPP NR system has a length of 10 ms (ΔfmaxNf / 100)*Tc). Also, the radio frame consists of 10 subframes (subfame, SF) of equal size. Here, Δfmax = 480*103 Hz, Nf = 4096, Tc = 1 / (Δfref*Nf,ref), Δfref = 15*103 Hz, and Nf,ref = 2048. The 10 subframes within one frame are each numbered from 0 to 9. Each subframe has a length of 1 ms and consists of one or more slots depending on the subcarrier spacing. More specifically, the subcarrier spacing that can be used in the 3GPP NR system is 15*2μ kHz. μ is the subcarrier spacing configuration factor and has a value of μ = 0 to 4. That is, 15 kHz, 30 kHz, 60 kHz, 120 kHz, or 240 kHz is used as the subcarrier spacing. The 1 ms long subframe consists of 2μ slots. At this time, the length of each slot is 2-μ ms. The 2μ slots within one subframe are each numbered from 0 to 2μ - 1. Also, the slots within one radio frame are each numbered from 0 to 10*2μ - 1. The time resources are divided by at least one of the radio frame number (or also called radio frame index), subframe number (or also called subframe index), and slot number (or slot index).

[0051] FIG. 2 is a diagram showing an example of a downlink (DL) / uplink (UL) slot structure in a wireless communication system. In particular, FIG. 2 shows the resource grid structure of the 3GPP NR system.

[0052] There is one resource grid per antenna port. Referring to FIG. 2, a slot includes a plurality of OFDM symbols in the time domain and a plurality of resource blocks (RBs) in the frequency domain. An OFDM symbol also means one symbol interval. Unless otherwise specified, an OFDM symbol is simply referred to as a symbol. Hereinafter, in this specification, a symbol includes an OFDM symbol, an SC-FDMA symbol, a DFTs-OFDM symbol, and the like. Referring to FIG. 2, the signal transmitted from each slot is represented by a resource grid consisting of Nsize, μgrid, x * NRBSC subcarriers and Nslotsymb OFDM symbols. Here, if it is a downlink resource grid, x = DL, and if it is an uplink resource grid, x = UL. Nsize, μgrid, and x indicate the number of resource blocks (RBs) according to the subcarrier spacing configuration factor μ (x is DL or UL), and Nslotsymb indicates the number of OFDM symbols in a slot. NRBSC is the number of subcarriers constituting one RB, and NRBSC = 12. An OFDM symbol is referred to as a CP-OFDM (cyclic prefix OFDM) symbol or a DFT-S-OFDM (discrete Fourier transform spread OFDM) symbol by a multiple access method.

[0053] The number of OFDM symbols included in one slot can vary depending on the length of the CP (cyclic prefix). For example, if it is a normal CP, one slot contains 14 OFDM symbols, while if it is an extended CP, one slot contains 12 OFDM symbols. In a specific embodiment, the extended CP is only used at a subcarrier spacing of 60 kHz. In FIG. 2, for the sake of convenience of explanation, the case where one slot consists of 14 OFDM symbols is illustrated, but the embodiments of the present invention are applied in the same manner to slots having other numbers of OFDM symbols. Referring to FIG. 2, each OFDM symbol includes Nsize, μgrid, x*NRBSC subcarriers in the frequency domain. The types of subcarriers are divided into data subcarriers for transmitting data, reference signal subcarriers for transmitting reference signals, and guard bands. The carrier frequency is also referred to as the center frequency (fc).

[0054] One RB is defined by NRBSC (for example, 12) consecutive subcarriers in the frequency domain. Incidentally, a resource composed of one OFDM symbol and one subcarrier is called a resource element (RE) or a tone. Therefore, one RB consists of Nslotsymb*NRBSC resource elements. Each resource element in the resource grid is uniquely defined by an index pair (k, l) within one slot. k is an index given from 0 to Nsize, μgrid, x*NRBSC - 1 in the frequency domain, and l is an index given from 0 to Nslotsymb - 1 in the time domain.

[0055] In order for the terminal to receive signals from the base station or transmit base station signals, the time / frequency synchronization of the terminal should be aligned with the time / frequency synchronization of the base station. This is because if the base station and the terminal are not synchronized, the terminal cannot determine the time and frequency parameters necessary to perform DL signal demodulation and UL signal transmission at the correct time points.

[0056] Each symbol of a radio frame operating in TDD (time division duplex) or an unpaired spectrum consists of at least one of a downlink symbol (DL symbol), an uplink symbol (UL symbol), or a flexible symbol. A radio frame operating on a downlink carrier in FDD (frequency division duplex) or a paired spectrum consists of a downlink symbol or a flexible symbol, and a radio frame operating on an uplink carrier consists of an uplink symbol or a flexible symbol. Downlink transmission can be performed in a downlink symbol, but uplink transmission cannot be performed. Uplink transmission can be performed in an uplink symbol, but downlink transmission cannot be performed. The type of a flexible symbol is determined whether it is used for downlink or uplink according to a signal.

[0057] Information regarding the type of each symbol, that is, information indicating any one of a downlink symbol, an uplink symbol, and a flexible symbol, consists of a cell-specific (or common) RRC signal. Further, information regarding the type of each symbol consists of an additional UE-specific (or dedicated) RRC signal. The base station uses the cell-specific RRC signal to notify i) the period of the cell-specific slot configuration, ii) the number of slots having only downlink symbols from the beginning of the period of the cell-specific slot configuration, iii) the number of downlink symbols from the first symbol of the slot immediately following the slot having only downlink symbols, iv) the number of slots having only uplink symbols from the end of the period of the cell-specific slot configuration, and v) the number of uplink symbols from the last symbol of the slot immediately preceding the slot having only uplink symbols. Here, a symbol not configured with either an uplink symbol or a downlink symbol is a flexible symbol.

[0058] If the information regarding the symbol type consists of the UE-specific RRC signal, the base station signals whether the flexible symbol is a downlink symbol or an uplink symbol by means of the cell-specific RRC signal. At this time, the UE-specific RRC signal cannot change the downlink symbol or uplink symbol consisting of the cell-specific RRC signal to another symbol type. The specific UE RRC signal signals, for each slot, the number of downlink symbols among the Nslotsymb symbols of the corresponding slot and the number of uplink symbols among the Nslotsymb symbols of the corresponding slot. At this time, the downlink symbols of the slot are continuously configured from the first symbol to the i-th symbol of the slot. Also, the uplink symbols of the slot are continuously configured from the j-th symbol to the last symbol of the slot (where i < j). In a slot, the symbol that is not configured as either an uplink symbol or a downlink symbol is a flexible symbol.

[0059] The type of symbol configured by the above RRC signal can be called a semi-static DL / UL configuration. In the semi-static DL / UL configuration configured by the above RRC signal, the flexible symbol may be indicated as a downlink symbol, an uplink symbol, or a flexible symbol by the dynamic SFI (slot format information) transmitted on the physical downlink control channel (PDCCH). At this time, the downlink symbol or uplink symbol configured by the RRC signal is not changed to another symbol type. Table 1 exemplifies the dynamic SFI that the base station can indicate to the UE.

[0060]

Table 1

[0061] In Table 1, D represents a downlink symbol, U represents an uplink symbol, and X represents a flexible symbol. As shown in Table 1, up to two DL / UL switchings may be allowed within one slot.

[0062] FIG. 3 is a diagram for explaining a physical channel used in a 3GPP system (e.g., NR) and a general signal transmission method using the corresponding physical channel.

[0063] If the terminal is powered on or newly enters a cell, the terminal performs an initial cell search operation S101. Specifically, the terminal synchronizes with the base station in the initial cell search. For this purpose, the terminal receives the primary synchronization signal (PSS) and the secondary synchronization signal (SSS) from the base station to synchronize with the base station and obtains information such as the cell ID. Next, the terminal receives the physical broadcast channel from the base station and obtains the broadcast information in the cell.

[0064] The terminal that has completed the initial cell search obtains more detailed system information than the system information obtained through the initial cell search by receiving the physical downlink control channel (PDCCH) and the physical downlink shared channel (PDSCH) carried on the PDCCH S102. Here, the system information transmitted to the terminal is cell-common system information for the terminal to operate correctly in the physical layer of Radio Resource Control (RRC), and is called remaining system information or System Information Block (SIB) 1.

[0065] When the terminal first connects to the base station or when there is no radio resource for signal transmission (when the terminal is in the RRC_IDLE mode), the terminal can perform a random access procedure with respect to the base station (steps S103 to S106). First, the terminal transmits a preamble on the physical random access channel (PRACH) (S103), and can receive a response message for the preamble on the PDCCH and the corresponding PDSCH from the base station (S104). When a valid random access response message is received by the terminal, the terminal transmits data including its own identifier and the like to the base station on the physical uplink shared channel (PUSCH) indicated by the uplink grant transmitted on the PDCCH from the base station (S105). Next, the terminal waits for the reception of the PDCCH as an instruction from the base station for collision resolution. When the terminal successfully receives the PDCCH with its own identifier (S106), the random access procedure ends. The terminal can obtain terminal-specific system information necessary for the terminal to operate correctly in the physical layer of the RRC layer during the random access procedure. If the terminal obtains the terminal-specific system information in the RRC layer, the terminal enters the RRC connected mode (RRC_CONNECTED mode).

[0066] The RRC layer is used for generating and managing messages for the control between the terminal and the Radio Access Network (RAN). Further, the base station and the terminal can perform, in the RRC layer, broadcasting of cell system information necessary for all terminals in the cell, transmission management of paging messages, mobility management and handover, measurement reporting of the terminal and control related thereto, terminal capability management and custody management. Generally, since the update of the signal transmitted in the RRC layer (hereinafter, the RRC signal) is longer than the transmission and reception cycle in the physical layer (that is, the transmission time interval, TTI), the RRC configuration can be maintained without change in a long cycle.

[0067] After the above-described procedure, the terminal performs PDCCH / PDSCH reception S107 and transmits a Physical Uplink Shared Channel (PUSCH) / Physical Uplink Control Channel (PUCCH) as a general uplink / downlink signal transmission procedure S108. In particular, the terminal receives downlink control information (DCI) via the PDCCH. The DCI includes control information such as resource allocation information for the terminal. Also, the DCI may have different formats depending on the usage purpose. The uplink control information (UCI) transmitted by the terminal to the base station via the uplink includes downlink / uplink ACK / NACK signals, a Channel Quality Indicator (CQI), a Precoding Matrix Index (PMI), a Rank Indicator (RI), etc. Here, the CQI, PMI, and RI are included in the Channel State Information (CSI). In the case of a 3GPP NR system, the terminal transmits control information such as the above-described HARQ-ACK and CSI via the PUSCH and / or PUCCH.

[0068] Figures 4A and 4B show the Synchronization Signal (SS) / Physical Broadcast Channel (PBCH) block for initial cell connection in a 3GPP NR system. When the terminal is powered on or attempts to newly access a cell, it acquires time and frequency synchronization with the cell and performs an initial cell search process. The terminal detects the physical cell identity NcellID of the cell during the cell search process. For this purpose, the terminal receives synchronization signals, for example, a Primary Synchronization Signal (PSS) and a Secondary Synchronization Signal (SSS), from the base station to synchronize with the base station. At this time, the terminal acquires information such as the cell identifier (identity, ID).

[0069] Referring to FIGS. 4A and 4B, the synchronization signal (SS) will be described in more detail. The synchronization signal is divided into the PSS and the SSS. The PSS is used to obtain time-domain synchronization such as OFDM symbol synchronization and slot synchronization and / or frequency-domain synchronization. The SSS is used to obtain frame synchronization and cell group ID. Referring to FIG. 4A and Table 2, the SS / PBCH block consists of 20 RBs (= 240 subcarriers) continuous on the frequency axis and 4 OFDM symbols continuous on the time axis. At this time, in the SS / PBCH block, the PSS is transmitted in the first OFDM symbol, and the SSS is transmitted in the third OFDM symbol via the 56th to 182nd subcarriers. Here, the lowest subcarrier index of the SS / PBCH block is numbered from 0. In the first OFDM symbol where the PSS is transmitted, the base station does not transmit signals via the remaining subcarriers, that is, the 0th to 55th and 183rd to 239th subcarriers. Also, in the third OFDM symbol where the SSS is transmitted, the base station does not transmit signals via the 48th to 55th and 183rd to 191st subcarriers. The base station transmits the PBCH (physical broadcast channel) via the remaining REs except for the signals in the SS / PBCH block.

[0070] [Table 2]

[0071] The SS has a total of 1008 unique physical layer cell identifiers through the combination of three PSSs and SSSs. Specifically, each physical layer cell ID becomes part of only one physical-layer cell-identifier group, and each group is grouped into 336 physical-layer cell-identifier groups, each containing three unique identifiers. Thus, the physical layer cell ID NcellID = 3N(1)ID + N(2)ID is uniquely defined by the index N(1)ID in the range from 0 to 335 indicating the physical-layer cell-identifier group and the index N(2)ID in the range from 0 to 2 indicating the physical-layer identifier within the physical-layer cell-identifier group. The terminal detects the PSS and identifies one of the three unique physical-layer identifiers. Also, the terminal detects the SSS and identifies one of the 336 physical layer cell IDs associated with the physical-layer identifier. At this time, the sequence dPSS(n) of the PSS is as shown in Equation 1 below.

[0072] d PSS (n) = 1 - 2x(m)

[0073] m = (n + 43N (2 ) ID ) mod 127

[0074] 0 ≤ n < 127

[0075] Here, x(i + 7) = (x(i + 4) + x(i)) mod 2, and

[0076] [x(6)x(5)x(4)x(3)x(2)x(1)x(0)] = [1110110] is given.

[0077] Also, the sequence d SSS (n) of the SSS is as follows.

[0078] d SSS (n) = [1 - 2x0((n + m0) mod 127][1 - 2x i ((n + m1) mod 127]

[0079] m0 = 15 floor(N( 1 ) ID / 112) + 5N( 2 ) ID

[0080] m1 = N( 1 ) ID mod 112

[0081] 0 ≤ n < 127

[0082] Here, x0(i + 7) = (x0(i + 4) + x0(i)) mod 2

[0083] x1(i + 7) = (x1(i + 1) + x1(i)) mod 2, and

[0084] [x0(6) x0(5) x0(4) x0(3) x0(2) x0(1) x0(0)] = [0000001]

[0085] [x1(6) x1(5) x1(4) x1(3) x1(2) x1(1) x1(0)] = [0000001] is given.

[0086] A 10 ms long radio frame is divided into two half - frames each 5 ms long. Referring to Fig. 4(b), the slots in each half - frame where the SS / PBCH block is transmitted will be described. The slot where the SS / PBCH block is transmitted is one of cases A, B, C, D, or E. In case A, the sub - carrier spacing is 15 kHz, and the start point of the SS / PBCH block is the {2, 8}+14*n - th symbol. At this time, for carrier frequencies below 3 GHz, n = 0, 1. Also, for carrier frequencies above 3 GHz and below 6 GHz, n = 0, 1, 2, 3. In case B, the sub - carrier spacing is 30 kHz, and the start point of the SS / PBCH block is the {4, 8, 16, 20}+28*n - th symbol. At this time, for carrier frequencies below 3 GHz, n = 0. Also, for carrier frequencies above 3 GHz and below 6 GHz, n = 0, 1. In case C, the sub - carrier spacing is 30 kHz, and the start point of the SS / PBCH block is the {2, 8}+14*n - th symbol. At this time, for carrier frequencies below 3 GHz, n = 0, 1. Also, for carrier frequencies above 3 GHz and below 6 GHz, n = 0, 1, 2, 3. In case D, the sub - carrier spacing is 120 kHz, and the start point of the SS / PBCH block is the {4, 8, 16, 20}+28*n - th symbol. At this time, for carrier frequencies above 6 GHz, n = 0, 1, 2, 3, 5, 6, 7, 8, 10, 11, 12, 13, 15, 16, 17, 18. In case E, the sub - carrier spacing is 240 kHz, and the start point of the SS / PBCH block is the {8, 12, 16, 20, 32, 36, 40, 44}+56*n - th symbol. At this time, for carrier frequencies above 6 GHz, n = 0, 1, 2, 3, 5, 6, 7, 8.

[0087] Figures 5A and 5B show procedures for control information and control channel transmission in a 3GPP NR system. Referring to Figure 5A, the base station can add a cyclic redundancy check (CRC) masked (e.g., XOR operation) with a radio network temporary identifier (RNTI) to the control information (e.g., downlink control information, DCI) (S202). The base station can scramble the CRC with an RNTI value determined by the purpose / target of each control information. The common RNTI used by one or more terminals may include at least any one of a system information RNTI (SI-RNTI), a paging RNTI (P-RNTI), a random access RNTI (RA-RNTI), and a transmit power control RNTI (TPC-RNTI). Also, the terminal-specific RNTI may include at least any one of a cell temporary RNTI (C-RNTI) and a CS-RNTI. Next, the base station performs channel encoding (e.g., polar coding) (S204), and then can perform rate-matching according to the amount of resources allocated for PDCCH transmission (S206). Thereafter, the base station can multiplex the DCI based on a PDCCH structure based on control channel elements (CCEs) (S208).

[0088] Also, the base station can map to the resources to be transmitted after applying additional processes (S210) such as scrambling, modulation (e.g., QPSK), and interleaving to the multiplexed DCI. A CCE is a basic resource unit for the PDCCH, and one CCE may be composed of a plurality (e.g., six) of REGs (resource element groups). One REG may be composed of a plurality (e.g., twelve) of REs. The number of CCEs used for one PDCCH can be defined as the aggregation level. In the 3GPP NR system, aggregation levels of 1, 2, 4, 8, or 16 can be used. FIG. 5B is a diagram related to the CCE aggregation level and the multiplexing of the PDCCH, showing the type of CCE aggregation level used for one PDCCH and the CCEs transmitted in the control region thereby.

[0089] FIG. 6 is a diagram showing a CORESET (control resource set) in which a PDCCH (physical downlink control channel) can be transmitted in the 3GPP NR system.

[0090] A CORESET is the time-frequency resource on which the PDCCH, which is a control signal for a terminal, is transmitted. Also, the search space, which will be described later, is mapped to one CORESET. Therefore, instead of monitoring all frequency bands to receive the PDCCH, the terminal monitors the time-frequency region designated as the CORESET and decodes the PDCCH mapped to the CORESET. The base station configures one or more CORESETS for each cell for the terminal. A CORESET consists of up to three consecutive symbols on the time axis. Also, a CORESET consists of units of six consecutive PRBs on the frequency axis. In the example of FIG. 5, CORESET #1 consists of consecutive PRBs, and CORESET #2 and CORESET #3 consist of non-consecutive PRBs. A CORESET can be located in any symbol within a slot. For example, in the example of FIG. 5, CORESET #1 starts from the first symbol of the slot, CORESET #2 starts from the fifth symbol of the slot, and CORESET #9 starts from the ninth symbol of the slot.

[0091] FIG. 7 is a diagram showing a method of setting a PDCCH search space in a 3GPP NR system.

[0092] To transmit PDCCH to a terminal, at least one or more search spaces exist in each CORESET. In an embodiment of the present invention, the search space is a set of all time-frequency resources (hereinafter, PDCCH candidates) where the PDCCH of the terminal is transmitted. The search space includes a common search space that all terminals in a cell belonging to the same base station should commonly search, and a terminal-specific or UE-specific search space that a specific terminal should search. In the common search space, all terminals in the cells belonging to the same base station monitor the PDCCH that is set to be commonly searched. Also, the terminal-specific search space is set for each terminal to monitor the PDCCH assigned to each terminal at different search space positions according to the terminal. In the case of the terminal-specific search space, due to the limited control region where the PDCCH is assigned, the search spaces between terminals may be partially overlapped and assigned. Monitoring the PDCCH includes blindly decoding the PDCCH candidates in the search space. When the blind decoding is successful, it is expressed that the PDCCH is (successfully) detected / received, and when the blind decoding fails, it is expressed that the PDCCH is not detected / not received, or not successfully detected / received.

[0093] For the sake of convenience of explanation, in order to transmit downlink control information to one or more terminals, the PDCCH scrambled with a group common (GC) RNTI that one or more terminals already know is called a group common (GC) PDCCH, or a common PDCCH. Also, in order to transmit uplink scheduling information or downlink scheduling information to a specific terminal, the PDCCH scrambled with a terminal-specific RNTI that the specific terminal already knows is called a terminal-specific PDCCH. The common PDCCH is included in the common search space, and the terminal-specific PDCCH is included in the common search space or the terminal-specific PDCCH.

[0094] The base station notifies each terminal or terminal group of information regarding resource allocation of the PCH (paging channel) and DL-SCH (downlink-shared channel), which are transmission channels, via the PDCCH (i.e., DL Grant), or information regarding resource allocation and HARQ (hybrid automatic repeat request) of the UL-SCH (i.e., UL Grant). The base station transmits the PCH transmission block and the DL-SCH transmission block via the PDSCH. The base station transmits data except for specific control information or specific service data via the PDSCH. Also, the terminal receives data except for specific control information or specific service data via the PDSCH.

[0095] The base station includes in the PDCCH and transmits information regarding to which terminal (one or more terminals) the data of the PDSCH is transmitted and how the corresponding terminal should receive and decode the PDSCH data. For example, assume that the DCI transmitted via a specific PDCCH is CRC masked with the RNTI "A", and that DCI indicates that the PDSCH is allocated to the radio resource (e.g., frequency position) "B" and indicates the transmission format information (e.g., size of the transmission block, modulation method, coding information, etc.) "C". The terminal monitors the PDCCH using the RNTI information it has. In this case, if there is a terminal that blindly decodes the PDCCH using the "A" RNTI, the corresponding terminal receives the PDCCH and receives the PDSCH indicated by "B" and "C" based on the information of the received PDCCH.

[0096] Table 3 shows an example of the PUCCH (physical uplink control channel) used in a radio communication system.

[0097]

Table 3

[0098] The PUCCH is used to transmit the following uplink control information (UCI).

[0099] - SR (Scheduling Request): Information used to request uplink UL-SCH resources.

[0100] - HARQ-ACK: Response to the PDCCH (indicating DL SPS release) and / or response to the uplink transport block (TB) on the PDSCH. HARQ-ACK indicates whether the information transmitted via the PDCCH or PDSCH has been received successfully. HARQ-ACK responses include positive ACK (simply ACK), negative ACK (hereinafter NACK), DTX (Discontinuous Transmission), or NACK / DTX. Here, the term HARQ-ACK is used interchangeably with HARQ-ACK / NACK, ACK / NACK. Generally, ACK is represented by the bit value 1, and NACK is represented by the bit value 0.

[0101] - CSI: Feedback information for the downlink channel. It is generated by the terminal based on the CSI-RS (Reference Signal) transmitted by the base station. MIMO (multiple input multiple output)-related feedback information includes RI and PMI. CSI is divided into CSI part 1 and CSI part 2 according to the information indicated by the CSI.

[0102] In the 3GPP NR system, five PUCCH formats are used to support various service scenarios, various channel environments, and the frame structure.

[0103] PUCCH format 0 is a format for transmitting 1-bit or 2-bit HARQ-ACK information or SR. PUCCH format 0 is transmitted via one or two OFDM symbols on the time axis and one RB on the frequency axis. If PUCCH format 0 is transmitted with two OFDM symbols, the same sequence is transmitted on different RBs for the two symbols. Through this, the terminal obtains a frequency diversity gain. More specifically, the terminal is M bit bits UCI (M bit = 1 or 2) to determine the cyclic shift value m cs and maps the sequence obtained by cyclic shifting the base sequence of length 12 by the determined value m cs to 12 REs of one OFDM symbol and one PRB for transmission. The number of available cyclic shifts for the terminal is 12. If M bit = 1, 1-bit UCI0 and 1 are indicated by sequences corresponding to two cyclic shifts with a cyclic shift value difference of 6. Also, if M bit = 2, 2-bit UCI00, 01, 11, 10 are indicated by sequences corresponding to four cyclic shifts with a cyclic shift value difference of 3.

[0104] PUCCH format 1 transmits 1-bit or 2-bit HARQ-ACK information or SR. PUCCH format 1 is transmitted via OFDM symbols that are continuous on the time axis and one PRB on the frequency axis. Here, the number of OFDM symbols occupied by PUCCH format 1 is one of 4 to 14. More specifically, UCI with Mbit = 1 is modulated by BPSK. The terminal modulates UCI with Mbit = 2 by QPSK (quadrature phase shift keying). A signal is obtained by multiplying the modulated complex valued symbol d(0) by a sequence of length 12. The terminal spreads and transmits the obtained signal on the even-numbered OFDM symbols assigned to PUCCH format 1 using time-axis OCC (orthogonal cover code). The maximum number of different terminals multiplexed on the same RB for PUCCH format 1 can be determined according to the length of the OCC used. On the odd-numbered OFDM symbols of PUCCH format 1, DMRS (demodulation reference signal) is spread and mapped by OCC.

[0105] PUCCH format 2 transmits UCI exceeding 2 bits. PUCCH format 2 is transmitted via one or two OFDM symbols on the time axis and one or more RBs on the frequency axis. If PUCCH format 2 is transmitted using two OFDM symbols, the same sequence is transmitted on different RBs via the two OFDM symbols. Through this, the terminal obtains a frequency diversity gain. More specifically, Mbit-bit UCI (Mbit > 2) is bit-level scrambled, QPSK modulated, and mapped to the RBs of one or two OFDM symbols. Here, the number of RBs is one of 1 to 16.

[0106] PUCCH format 3 or PUCCH format 4 transmits UCI exceeding 2 bits. PUCCH format 3 or PUCCH format 4 is transmitted via OFDM symbols continuous on the time axis and one PRB on the frequency axis. The number of OFDM symbols occupied by PUCCH format 3 or PUCCH format 4 is one of 4 to 14. Specifically, the terminal modulates Mbit bits of UCI (Mbit > 2) with π / 2-BPSK (Binary Phase Shift Keying) or QPSK to generate complex symbols d(0) to d(Msymb-1). Here, when using π / 2-BPSK, Msymb = Mbit, and when using QPSK, Msymb = Mbit / 2. The terminal does not apply block-unit spreading to PUCCH format 3. However, the terminal may apply block-unit spreading to one RB (i.e., 12 subcarriers) using a length-12 PreDFT-OCC so that PUCCH format 4 has two or four multiplexing capacities. The terminal transmit precodes (or DFT-precodes) the spread signal, maps it to each RE, and transmits the spread signal.

[0107] At this time, the number of RBs occupied by PUCCH format 2, PUCCH format 3, or PUCCH format 4 is determined according to the length of the UCI transmitted by the terminal and the maximum code rate. If the terminal uses PUCCH format 2, the terminal transmits both HARQ-ACK information and CSI information via PUCCH. If the number of RBs that the terminal can transmit is greater than the maximum number of RBs that PUCCH format 2, PUCCH format 3, or PUCCH format 4 can use, the terminal does not transmit some UCI information according to the priority of the UCI information and transmits only the remaining UCI information.

[0108] The PUCCH format 1, PUCCH format 3, or PUCCH format 4 is configured via an RRC signal such that it indicates frequency hopping within a slot. When frequency hopping is configured, the index of the RBs to perform frequency hopping is from the RRC signal. If the PUCCH format 1, PUCCH format 3, or PUCCH format 4 is transmitted over N OFDM symbols on the time axis, the first hop has floor(N / 2) OFDM symbols and the second hop has ceil(N / 2) OFDM symbols.

[0109] The PUCCH format 1, PUCCH format 3, or PUCCH format 4 is configured to be repeatedly transmitted over multiple slots. At this time, the number K of slots in which the PUCCH is repeatedly transmitted is configured by the RRC signal. The repeatedly transmitted PUCCH should start from the OFDM symbol at the same position within each slot and have the same length. If any one of the OFDM symbols of the OFDM symbols in the slot where the terminal should transmit the PUCCH is indicated as a DL symbol by the RRC signal, the terminal does not transmit the PUCCH from the corresponding slot and defers transmission to the next slot.

[0110] On one hand, in the 3GPP NR system, the terminal performs transmission and reception using a bandwidth smaller than or equal to the bandwidth of the carrier (or cell). For this purpose, the terminal forms a BWP (bandwidth part) consisting of a part of the continuous bandwidth within the carrier bandwidth. A terminal operating according to TDD or operating in an unpaired spectrum can form a maximum of 4 DL / UL BWP pairs in one carrier (or cell). Also, the terminal activates one DL / UL BWP pair. A terminal operating according to FDD or operating in a paired spectrum can form a maximum of 4 DL BWPs in the downlink carrier (or cell) and a maximum of 4 UL BWPs in the uplink carrier (or cell). The terminal activates one DL BWP and one UL BWP for each carrier (or cell). The terminal may not receive or transmit from time-frequency resources other than the activated BWP. The activated BWP is referred to as the active BWP.

[0111] The base station refers to the activated BWP among the BWPs configured by the terminal as DCI. The BWP indicated by the DCI is activated, and the other configured BWP(s) is deactivated. In a carrier (or cell) operating in TDD, the base station includes a BPI (bandwidth part indicator) indicating the activated BWP in the DCI that schedules the PDSCH or PUSCH in order to change the DL / UL BWP pair of the terminal. The terminal receives the DCI that schedules the PDSCH or PUSCH and identifies the DL / UL BWP pair activated based on the BPI. In the case of a downlink carrier (or cell) operating in FDD, the base station includes a BPI informing the activated BWP in the DCI that schedules the PDSCH in order to change the DL BWP of the terminal. In the case of an uplink carrier (or cell) operating in FDD, the base station includes a BPI indicating the activated BWP in the DCI that schedules the PUSCH in order to change the UL BWP of the terminal.

[0112] Figure 8 is a conceptual diagram for explaining carrier aggregation.

[0113] Carrier aggregation means a method in which a terminal uses a frequency block consisting of uplink resources (or component carriers) and / or downlink resources (or component carriers), or a plurality of cells (in a logical sense) to use in one large logical frequency band in order for a wireless communication system to use a wider frequency band. Hereinafter, for convenience of explanation, the term will be unified as component carrier.

[0114] Referring to FIG. 8, as an example of a 3GPP NR system, the overall system band includes a maximum of 16 component carriers, and each component carrier has a maximum bandwidth of 400 MHz. A component carrier includes one or more physically continuous subcarriers. In FIG. 8, each component carrier is shown to have the same bandwidth, but this is only an example, and each component carrier may have a different bandwidth from each other. Also, although each component carrier is shown to be adjacent to each other on the frequency axis, the drawing shows a logical concept, and each component carrier may be physically adjacent to each other or may be separated.

[0115] In each component carrier, different center frequencies are used. Also, in physically adjacent component carriers, one common center frequency is used. In the embodiment of FIG. 8, assuming that all component carriers are physically adjacent, the center frequency A is used for all component carriers. Also, assuming that each component carrier is not physically adjacent, the center frequency A and the center frequency B are used in each component carrier.

[0116] If the overall system bandwidth is extended by carrier aggregation, the frequency bands used for communication with each terminal are defined in terms of component carriers. Terminal A uses the entire 100 MHz system bandwidth and communicates using all five component carriers. Terminals B1 to B5 use only a 20 MHz bandwidth and communicate using one component carrier. Terminals C1 and C2 use only a 40 MHz bandwidth and communicate using two component carriers each. The two component carriers may or may not be logically / physically adjacent. The example of FIG. 8 shows the case where Terminal C1 uses two non-adjacent component carriers and Terminal C2 uses two adjacent component carriers.

[0117] FIG. 9 is a diagram for explaining terminal carrier communication and multi-carrier communication. In particular, FIG. 9(a) shows the sub-frame structure of a single carrier, and FIG. 9(b) shows the sub-frame structure of multi-carriers.

[0118] Referring to FIG. 9(a), a general wireless communication system performs data transmission or reception via one DL band and its corresponding one UL band in the case of the FDD mode. In another specific embodiment, in the case of the TDD mode, the wireless frame is divided in the time domain into an uplink time unit and a downlink time unit, and data transmission or reception is performed via the uplink / downlink time unit. Referring to FIG. 9(b), three 20 MHz component carriers (CCs) are aggregated for UL and DL respectively, and a 60 MHz bandwidth is supported. Each CC may or may not be adjacent to each other in the frequency domain. FIG. 9(b) shows the case where, for the sake of convenience, the bandwidths of the UL CC and the DL CC are both the same and symmetric, but the bandwidth of each CC may be determined independently. Also, an asymmetric carrier aggregation with different numbers of UL CCs and DL CCs is possible. The DL / UL CCs allocated / configured to a specific terminal via RRC are referred to as the serving DL / UL CCs of the specific terminal.

[0119] The base station communicates with the terminal by activating some or all of the serving CCs of the terminal or deactivating some of the CCs. The base station may change the CCs to be activated / deactivated or change the number of CCs to be activated / deactivated. When the base station assigns the CCs available to the terminal on a cell-specific or terminal-specific basis, at least one of the CCs once assigned need not be deactivated unless the CC assignment for the terminal is completely reconfigured or the terminal performs a handover. One CC that is not deactivated for the terminal is referred to as the primary CC (PCC) or the primary cell (PCell), and the CCs that can be freely activated / deactivated by the base station are referred to as the secondary CCs (SCCs) or the secondary cells (SCells).

[0120] On the other hand, 3GPP NR uses the concept of a cell to manage radio resources. A cell is defined as a combination of a downlink resource and an uplink resource, that is, a combination of a DL CC and a UL CC. A cell consists of a DL resource alone or a combination of a DL resource and a UL resource. If carrier aggregation is supported, the linkage between the carrier frequency of the DL resource (or the DL CC) and the carrier frequency of the UL resource (or the UL CC) is indicated by the system information. The carrier frequency means the center frequency of each cell or CC. The cell corresponding to the PCC is called the PCell, and the cell corresponding to the SCC is called the SCell. The carrier corresponding to the PCell in the downlink is the DL PCC, and the carrier corresponding to the PCell in the uplink is the UL PCC. Similarly, the carrier corresponding to the SCell in the downlink is the DL SCC, and the carrier corresponding to the SCell in the uplink is the UL SCC. Depending on the terminal capacity, the serving cell(s) consist of one PCell and zero or more SCells. For a UE in the RRC_CONNECTED state but with carrier aggregation not configured or not supported, there is only one serving cell consisting of the PCell alone.

[0121] As described above, the term "cell" used in carrier aggregation is distinguished from the term "cell" that refers to a certain geographical area where communication services are provided by one base station or one antenna group. However, in order to distinguish between the cell referring to a certain geographical area and the cell of carrier aggregation, in the present invention, the cell of carrier aggregation is referred to as CC, and the cell of the geographical area is referred to as cell.

[0122] FIG. 10 is a diagram showing an example to which a cross-carrier scheduling technique is applied. If cross-carrier scheduling is set, the control channel transmitted via the first CC schedules the data channel transmitted via the first CC or the second CC using the carrier indicator field (CIF). The CIF is included in the DCI. In other words, a scheduling cell is set, and the DL grant / UL grant transmitted from the PDCCH area of the scheduling cell schedules the PDSCH / PUSCH of the scheduled cell. That is, a search area for a plurality of component carriers exists in the PDCCH area of the scheduling cell. The PCell is basically a scheduling cell, and a specific SCell is designated as a scheduling cell by a higher layer.

[0123] In the embodiment of FIG. 10, it is assumed that three DL CCs are merged. Here, assume that DL component carrier #0 is the DL PCC (or, PCell), and DL component carriers #1 and #2 are DL SCCs (or, SCell). Also, assume that the DL PCC is set as the PDCCH monitoring CC. Without configuring cross-carrier scheduling by UE-specific (or UE-group-specific, or cell-specific) higher layer signaling, the CIF is disabled, and each DL CC transmits only the PDCCH that schedules its own PDSCH without CIF according to the NR PDCCH rule (non-cross-carrier scheduling, self-carrier scheduling). On the contrary, if cross-carrier scheduling is configured by UE-specific (or UE-group-specific, or cell-specific) higher layer signaling, the CIF is enabled, and a specific CC (e.g., DL PCC) transmits not only the PDCCH that schedules the PDSCH of DL CC A using the CIF but also the PDCCH that schedules the PDSCH of other CCs (cross-carrier scheduling). On the contrary, no PDCCH is transmitted on other DL CCs. Therefore, the UE monitors the PDCCH without CIF to receive the self-carrier scheduled PDSCH or monitors the PDCCH with CIF to receive the cross-carrier scheduled PDSCH according to whether cross-carrier scheduling is configured for the UE.

[0124] On the other hand, although FIGS. 9 and 10 illustrate the subframe structure of the 3GPP LTE-A system, the same or similar configuration is applicable to the 3GPP NR system. However, in the 3GPP NR system, the subframes in FIGS. 9 and 10 are switched to slots.

[0125] FIG. 11 is a block diagram showing the configurations of a terminal and a base station according to an embodiment of the present invention. In an embodiment of the present invention, the terminal is implemented as various types of wireless communication devices or computing devices that ensure portability and mobility. The terminal is referred to as a UE, STA (Station), MS (Mobile Subscriber), etc. Also, in an embodiment of the present invention, the base station controls and manages a cell (e.g., macro cell, femto cell, pico cell, etc.) corresponding to a service area and performs functions such as signal transmission, channel assignment, channel monitoring, self-diagnosis, and relaying. The base station is referred to as a gNB (next Generation NodeB) or an AP (Access Point), etc.

[0126] As shown in the figure, a terminal 100 according to an embodiment of the present invention includes a processor 110, a communication module 120, a memory 130, a user interface unit 140, and a display unit 150.

[0127] First, the processor 110 executes various instructions or programs and processes data inside the terminal 100. Also, the processor 110 controls the overall operation including each unit of the terminal 100 and controls the transmission and reception of data between the units. Here, the processor 110 is configured to perform operations according to the embodiments described in the present invention. For example, the processor 110 may receive slot configuration information, determine the configuration of the slot based on it, and perform communication according to the determined slot configuration.

[0128] Next, the communication module 120 is an integrated module that performs wireless communication using a wireless communication network and wireless LAN access using a wireless LAN. For this purpose, the communication module 120 includes a plurality of network interface cards (NICs), such as cellular communication interface cards 121, 122, and unlicensed band communication interface card 123, in a built-in or external form. In the drawings, the communication module 120 is shown as an integrated module, but each network interface card may be arranged independently according to the circuit configuration or application, different from the drawings.

[0129] The cellular communication interface card 121 transmits and receives wireless signals with at least one of the base station 200, external device, and server via a mobile communication network, and provides a cellular communication service in a first frequency band based on the instructions of the processor 110. According to an embodiment, the cellular communication interface card 121 includes at least one NIC module that uses a frequency band less than 6 GHz. At least one NIC module of the cellular communication interface card 121 independently performs cellular communication with at least one of the base station 200, external device, and server according to the cellular communication standard or protocol of the frequency band less than 6 GHz supported by the corresponding NIC module.

[0130] The cellular communication interface card 122 transmits and receives wireless signals with at least one of the base station 200, external device, and server using a mobile communication network, and provides a cellular communication service in a second frequency band based on the instructions of the processor 110. According to an embodiment, the cellular communication interface card 122 includes at least one NIC module that uses a frequency band of 6 GHz or higher. At least one NIC module of the cellular communication interface card 122 independently performs cellular communication with at least one of the base station 200, external device, and server according to the cellular communication standard or protocol of the frequency band of 6 GHz or higher supported by the corresponding NIC module.

[0131] The unlicensed band communication interface card 123 transmits and receives radio signals with at least one of the base station 200, external device, and server via a third frequency band which is an unlicensed band, and provides an unlicensed band communication service based on the instructions of the processor 110. The unlicensed band communication interface card 123 includes at least one NIC module that utilizes the unlicensed band. For example, the unlicensed band may be a band of 2.4 GHz or 52.6 GHz. At least one NIC module of the unlicensed band communication interface card 123 performs cellular communication with at least one of the base station 200, external device, and server independently or dependently according to the unlicensed band communication standard or protocol of the frequency band supported by the corresponding NIC module.

[0132] Next, the memory 130 stores the control program used in the terminal 100 and various data thereby. Such a control program includes a predetermined program necessary for the terminal 100 to perform wireless communication with at least one of the base station 200, external device, and server.

[0133] Next, the user interface 140 includes various forms of input / output means provided in the terminal 100. That is, the user interface unit 140 receives user input using various input means, and the processor 110 controls the terminal 100 based on the received user input. Also, the user interface 140 performs output based on the instructions of the processor 110 using various output means.

[0134] Next, the display unit 150 outputs various images on the display screen. The display unit 150 outputs various display objects such as content performed by the processor 110 or a user interface based on the control instructions of the processor 110.

[0135] Also, the base station 200 according to an embodiment of the present invention includes a processor 210, a communication module 220, and a memory 230.

[0136] First, the processor 210 executes various instructions or programs and processes data inside the base station 200. Also, the processor 210 controls the overall operation including each unit of the base station 200 and controls the transmission and reception of data between units. Here, the processor 210 is configured to perform operations according to the embodiments described in the present invention. For example, the processor 210 may signal slot configuration information and perform communication according to the signaled slot configuration.

[0137] Next, the communication module 220 is an integrated module that performs wireless communication using a wireless communication network and wireless LAN access using a wireless LAN. For this purpose, the communication module 220 includes a plurality of network interface cards such as cellular communication interface cards 221, 222, and unlicensed band communication interface cards 223 in a built-in or external form. In the drawings, the communication module 220 is shown as an integrated module, but each network interface card may be independently arranged according to the circuit configuration or application, different from the drawings.

[0138] The cellular communication interface card 221 transmits and receives wireless signals with at least one of the terminal 100, an external device, and a server described above using a mobile communication network, and provides a cellular communication service in a first frequency band based on an instruction from the processor 210. According to an embodiment, the cellular communication interface card 221 includes at least one NIC module that uses a frequency band less than 6 GHz. At least one NIC module of the cellular communication interface card 221 independently performs cellular communication with at least one of the terminal 100, an external device, and a server according to a cellular communication standard or protocol in a frequency band less than 6 GHz supported by the corresponding NIC module.

[0139] The cellular communication interface card 222 transmits and receives wireless signals with at least one of the terminal 100, an external device, and a server using a mobile communication network, and provides a cellular communication service in a second frequency band based on an instruction from the processor 210. According to one embodiment, the cellular communication interface card 222 includes at least one NIC module that utilizes a frequency band of 6 GHz or higher. At least one NIC module of the cellular communication interface card 222 independently performs cellular communication with at least one of the terminal 100, an external device, and a server according to a cellular communication standard or protocol in a frequency band of 6 GHz or higher supported by the corresponding NIC module.

[0140] The unlicensed band communication interface card 223 transmits and receives wireless signals with at least one of the terminal 100, an external device, and a server using a third frequency band that is an unlicensed band, and provides a communication service in the unlicensed band based on an instruction from the processor 210. The unlicensed band communication interface card 223 includes at least one NIC module that utilizes an unlicensed band. For example, the unlicensed band may be a band of 2.4 GHz or 52.6 GHz. At least one NIC module of the unlicensed band communication interface card 223 independently or dependently performs cellular communication with at least one of the terminal 100, an external device, and a server according to an unlicensed band communication standard or protocol in the frequency band supported by the corresponding NIC module.

[0141] The terminal 100 and the base station 200 shown in FIG. 11 are block diagrams according to an embodiment of the present invention, and the separately shown blocks logically distinguish the elements of the device. Therefore, the above-described elements of the device are attached to one chip or a plurality of chips according to the design of the device. In addition, some configurations of the terminal 100, for example, the user interface unit 150 and the display unit 150, may be selectively provided in the terminal 100. Further, the user interface 140 and the display unit 150, etc., may be additionally provided in the base station 200 if necessary.

[0142] FIG. 12A and FIG. 12B are diagrams showing the scheduling of the physical uplink shared channel in the time domain, and FIG. 13 is a diagram showing the scheduling of the physical uplink shared channel in the frequency domain.

[0143] A method for a terminal to transmit a physical uplink shared channel (PUSCH) will be described with reference to FIGS. 12A, 12B, and 13.

[0144] A terminal can transmit uplink data via the physical uplink shared channel. The terminal can transmit uplink data by a method (DG, dynamic grant) of scheduling the transmission of the physical uplink shared channel with downlink control information (DCI) transmitted by receiving a physical downlink control channel (PDCCH), or by a method (CG, configured grant) of transmitting the physical uplink shared channel by a preconfigured resource and transmission method from a base station.

[0145] The downlink control information (DCI) transmitted by a terminal receiving a PDCCH may include scheduling information for the PUSCH. This scheduling information may include information regarding the time domain (hereinafter, TDRA (time-domain resource assignment)) and information regarding the frequency domain (hereinafter, FDRA (frequency-domain resource assignment)). The terminal can interpret the DCI transmitted by receiving the PDCCH based on the control resource set and search space information, and perform the operations indicated by the DCI. The DCI may include one of DCI formats 0_0, 0_1, or 0_2 for scheduling the physical uplink shared channel (PUSCH).

[0146] The time domain information of the PUSCH indicated by the TDRA field in DCI format 0_0, 0_1, or 0_2 includes the following. K2 is the offset value between the slot in which the PDCCH is received from the base station and the slot in which the terminal transmits the PUSCH. SLIV (Start and length indication value) is the value in which the start symbol index (S) and the symbol length (L) of the PUSCH are jointly coded within the slot indicated by K2.

[0147] When the terminal receives DCI format 0_0, 0_1, or 0_2 that schedules the PUSCH in slot n, it determines the slot as slot floor(n*2 μPUSCH / n*2 μPDCCH ) + K2. Here, μPUSCH and μPDCCH are the subcarrier spacings (SCS) of the cell in which the PUSCH is scheduled and the cell in which the PDCCH is received, respectively.

[0148] For example, referring to FIG. 12A, since the subcarrier spacings of the cell in which the PDCCH is received and the cell in which the PUSCH is scheduled are the same, when the terminal receives the PDCCH in slot n and the K2 value is indicated as 4 as an example, the terminal determines the slot in which the PUSCH is scheduled as slot n + K2 = n + 4.

[0149] The physical uplink shared channel transmitted by the terminal can apply two mapping types, A and B. For the SLIV in which the start symbol index and symbol length of the PUSCH are jointly encoded, the range of values that can be taken depends on the PUSCH mapping type. For PUSCH mapping type A, only resource allocation including DMRS symbols is possible, and the DMRS symbol is located in the third or fourth OFDM symbol of the slot according to the value indicated by the upper layer. That is, in the case of PUSCH mapping type A, the index (S) of the start symbol of the PUSCH can be 0, and the length (L) of the PUSCH can be one of the values from 4 to 14 (12 in the case of extended CP) depending on the DMRS symbol position. In the case of PUSCH mapping type B, since the DMRS symbol is always the first symbol of the PUSCH, S can be one of the values from 0 to 13 (11 in the case of extended CP), and L can be one of the values from 1 to 14 (12 in the case of extended CP). Also, since one PUSCH does not cross the slot boundary, the values of S and L must satisfy S + L ≤ 14 (12 in the case of extended CP).

[0150] Figure 12B shows examples of PUSCH according to the PUSCH mapping type. In order from the upper figure, the terminal determines that a mapping type A PUSCH in which the third symbol is a DMRS symbol, the index (S) of the start symbol is 0, and the length (L) is 7, a mapping type A PUSCH in which the fourth symbol is a DMRS symbol, the index (S) of the start symbol is 0, and the length (L) is 7, and a mapping type B PUSCH in which the first symbol is a DMRS symbol, the index (S) of the start symbol is 5, and the length (L) is 5 are scheduled. The frequency domain information of the PUSCH indicated by the FDRA field in DCI format 0_0, 0_1, or 0_2 can be divided into two according to the frequency resource allocation type.

[0151] The first type is frequency resource allocation type 0. A fixed number of PRBs grouped by the number of RBs included in the BWP configured for the terminal form an RBG (resource block group). The terminal is instructed with a bitmap of RBG units to determine whether to use the RBG. The number of PRBs included in one RBG is configured by the upper layer. The larger the number of RBs included in the BWP configured for the terminal, the more PRBs are configured. For example, referring to FIG. 13(a), when the BWP size configured for the terminal is 72 PRBs and one RBG is composed of 4 PRBs, the terminal determines 4 PRBs from PRB0 in ascending order as one RBG. That is, when mapping from PRB0 to PRB3 as RBG0, PRB4 to PRB7 as RBG1, and so on up to RBG17, a total of 18 bits, with 1 bit (0 or 1) per RBG, are received to determine whether to use the PRBs within the RBG. At this time, if the bit value is 0, it is determined that no PUSCH is scheduled for any PRB within the RBG; if the bit value is 1, it is determined that PUSCH is scheduled for all PRBs within the RBG. Alternatively, the bit value can be applied inversely.

[0152] The second type is frequency resource allocation type 1, which can indicate information on consecutive PRBs allocated according to the size of the terminal's initial BWP or active BWP. This information is the RIV (resource indication value) in which the start index (S) and length (L) of the consecutive PRBs are jointly encoded. For example, referring to FIG. 13(b), when the BWP size of the terminal is 50 PRBs and PUSCH is scheduled from PRB2 to PRB11, the start index of the consecutive PRBs is 2 and the length is 10. The terminal receives RIV = N size BWP *(L - 1)+S = 50*(10 - 1)+2 = 452, and can thus determine that the start index and length of the consecutive PRBs for which PUSCH is scheduled are 2 and 10 respectively.

[0153] For DCI format 0_1 or 0_2 that schedules PUSCH, the terminal may be configured to use only one of two frequency resource allocation types for PUSCH from the upper layer, or to use the two types dynamically. When configured to use the two types dynamically, the terminal can determine which type it is from the most significant bit (MSB) 1 bit of the FDRA field in DCI format 0_1 or 0_2 that schedules PUSCH.

[0154] Support a configured grant-based uplink shared channel transmission method configured to support uplink URLLC transmission, etc., and this method is also called grant-free transmission. The configured grant-based uplink transmission method is a method in which the base station configures the resources available for uplink transmission to the terminal by the upper layer, that is, RRC signaling, and the terminal transmits an uplink shared channel using the resources. This method may be divided into two types depending on whether activation or deactivation using DCI is possible.

[0155] The type 1 configured grant-based transmission method is a method of setting the resources and transmission method for configured grant-based transmission in advance in the upper layer.

[0156] The type 2 configured grant-based transmission method is a method of setting configured grant-based transmission in the upper layer, and the resources and method for transmission are indicated by DCI transmitted on the physical downlink control channel.

[0157] Since the configured grant-based uplink transmission method can support URLLC transmission, it supports retransmission in multiple slots for the purpose of ensuring high reliability. At this time, one of the values of the RV (redundancy version) sequence {0, 0, 0, 0}, {0, 2, 3, 1}, {0, 3, 0, 3} is set, and the RV corresponding to the (mod(n - 1, 4)+1)-th value is used in the n-th retransmission. Also, the terminal for which retransmission is configured can start retransmission only in the slot corresponding to the RV value of 0. However, when the RV sequence is {0, 0, 0, 0} and retransmission is performed in 8 slots, retransmission cannot be started in the 8-th slot. The terminal ends retransmission when it reaches the number of retransmissions set in the upper layer or exceeds the period, or when it receives a UL grant having the same HARQ process ID. Here, the UL grant means DCI for scheduling PUSCH.

[0158] In order to improve the reliability of reception and transmission of the physical uplink shared channel between the base station and the terminal in a wireless communication system, retransmission of the uplink shared channel may be configured by the base station for the terminal. This will be described with reference to FIGS. 14A and 14B.

[0159] FIGS. 14A and 14B are diagrams showing retransmission of the physical uplink shared channel according to an example.

[0160] Referring to FIGS. 14A and 14B, the PUSCH retransmissions that the terminal can perform can be divided into two types.

[0161] First, the transmission process of type A PUSCH retransmission of the terminal is as follows. When the terminal receives DCI format 0_1 or 0_2 in the PDCCH that schedules the PUSCH from the base station, PUSCH retransmission is possible in K consecutive slots. Here, the terminal can either have the K value set by the upper layer or receive it added in the TDRA field of the DCI. For example, referring to Figure 14A, assuming the terminal receives the PDCCH that schedules the PUSCH in slot n and receives a K2 value of 2 and a K value of 4 from the DCI format received in the PDCCH, the terminal starts transmitting the PUSCH in slot n + K2, i.e., n + 2, and retransmits the PUSCH from slot n + 2 to slot n + 2 + K - 1, i.e., n + 5. At this time, the time and frequency resources for transmitting the PUSCH in each slot are the same as those indicated by the DCI. That is, the PUSCH may be transmitted in the same symbol and PRB within the slot.

[0162] Next, the transmission process of type B PUSCH retransmission for supporting low-latency PUSCH retransmission to meet the requirements of URLLC, etc., of the terminal is as follows. The terminal may be instructed in the TDRA field of the base station about the start symbol (S) of the PUSCH and the length (L) of the PUSCH. Here, the PUSCH obtained based on the indicated start symbol and length is a temporarily obtained PUSCH rather than the actually transmitted PUSCH, and is called the nominal PUSCH. Also, the terminal may be instructed in the TDRA field about the nominal retransmission count (N) of the nominal PUSCH indicated above. The terminal can determine N nominal PUSCHs including the nominal PUSCH indicated in the TDRA field. Here, the lengths of the N nominal PUSCHs are the same as L, and since there are no other symbols between the nominal PUSCHs, they are continuous on the time axis.

[0163] The terminal can determine the actual PUSCH to be actually transmitted from the nominal PUSCH. One nominal PUSCH may be determined to be one or more actually transmitted PUSCHs. The terminal may be instructed or configured by the base station with symbols unusable in PUSCH retransmission type B. This is called an invalid symbol. The terminal can exclude the invalid symbol from the nominal PUSCH. As described above, the nominal PUSCH may be determined continuously for symbols or discontinuously when excluding the invalid symbol. The actually transmitted PUSCH may be determined as consecutive symbols in one nominal PUSCH excluding the invalid symbol. Here, when the consecutive symbols cross the slot boundary, the actually transmitted PUSCH may be determined separately based on that boundary.

[0164] For reference, the invalid symbol may include at least the DL symbols configured by the base station for the terminal.

[0165] For example, referring to FIG. 14B, assume that for the terminal, a PUSCH transmission of 5 symbol lengths is scheduled starting from the 12th OFDM symbol of the first slot (slot n), and 4 type B retransmissions are indicated. The nominal PUSCH is as follows. The first nominal PUSCH (nominal#1) includes symbol (n,11), symbol (n,12), symbol (n,13), symbol (n+1,0), and symbol (n+1,1). The second nominal PUSCH (nominal#2) includes symbol (n+1,2), symbol (n+1,3), symbol (n+1,4), symbol (n+1,5), and symbol (n+1,6). The third nominal PUSCH (nominal#3) includes symbol (n+1,7), symbol (n+1,8), symbol (n+1,9), symbol (n+1,10), and symbol (n+1,11). The fourth nominal PUSCH (nominal#4) includes symbol (n+1,12), symbol (n+1,13), symbol (n+2,0), symbol (n+2,1), and symbol (n+2,2). Here, symbol (n,k) represents symbol k of slot n. The symbol k index starts from 0 to 13 for normal CP and from 0 to 11 for extended CP.

[0166] Assume that the null symbols are set or indicated for symbol 6 and symbol 7 of slot n+1. Due to the null symbols set or indicated by the base station, the last symbol of the second nominal PUSCH (nominal#2) is excluded, and the first symbol of the third nominal PUSCH (nominal#3) is excluded.

[0167] Due to the slot boundary, the first nominal PUSCH (nominal#1) is divided into two actually transmitted PUSCHs (actual#1 and actual#2). The second nominal PUSCH (nominal#2) and the third nominal PUSCH (nominal#3) are each divided into one actually transmitted PUSCH (actual#3 and actual#4) by grouping consecutive symbols excluding the invalid symbols. Finally, the fourth nominal PUSCH (nominal#4) is divided into two actually transmitted PUSCHs (actual#5 and actual#6) by the slot boundary. The terminal finally transmits the actually transmitted PUSCH.

[0168] One actually transmitted PUSCH must include at least one DMRS symbol. When PUSCH retransmission type B is set, the actually transmitted PUSCH with a full length of 1 symbol may be omitted from transmission. This is because the actually transmitted PUSCH with a length of 1 symbol cannot transmit information other than DMRS.

[0169] To obtain a diversity gain in the frequency domain, frequency hopping may be set for the terminal.

[0170] When it is PUSCH retransmission type A, frequency hopping may be set for the terminal to be either intra-slot frequency hopping that performs frequency hopping within a slot or inter-slot frequency hopping that performs frequency hopping for each slot. When intra-slot frequency hopping is set for the terminal, the terminal bisects the PUSCH in the time domain in the slot where the PUSCH is transmitted, transmits half of it on the scheduled PRBs, and transmits the remaining half on the PRBs obtained by adding an offset value to the scheduled PRBs. At this time, the offset value has two or four values set by the active BWP size in the upper layer, and one of those values may be indicated to the terminal by DCI. When inter-slot frequency hopping is set for the terminal, the PUSCH is transmitted on the scheduled PRBs in the slots where the slot index is even, and the PUSCH is transmitted on the PRBs obtained by adding an offset value to the scheduled PRBs in the odd-numbered slots.

[0171] When it is PUSCH Type B retransmission, frequency hopping may be either inter-repetition frequency hopping that performs frequency hopping at the nominal PUSCH boundary or inter-slot frequency hopping that performs frequency hopping for each slot. When inter-repetition frequency hopping is configured for the terminal, for the actual PUSCH corresponding to the odd-numbered nominal PUSCH, the terminal transmits the PUSCH on the scheduled PRBs, and for the actual PUSCH corresponding to the even-numbered nominal PUSCH, the terminal transmits the PUSCH on the PRBs obtained by adding an offset value to the scheduled PRBs. At this time, the offset value is set to two or four values according to the active BWP size in the upper layer, and one of these values may be indicated to the terminal by DCI. When inter-slot frequency hopping is configured for the terminal, for the actual PUSCH in the slot with an even slot index, the terminal transmits the PUSCH on the scheduled PRBs, and for the actual PUSCH in the odd-numbered slots, the terminal transmits the PUSCH on the PRBs obtained by adding an offset value to the scheduled PRBs.

[0172] When the terminal performs PUSCH retransmission, if the symbol scheduled for transmitting PUSCH in a specific slot overlaps with the symbol position configured semi-statically for receiving a DL symbol or an SS / PBCH block, the terminal does not transmit the overlapping PUSCH in that slot and does not defer the transmission to the next slot.

[0173] Hereinafter, with reference to FIG. 15, a method for a terminal to transmit a physical uplink control channel (PUCCH) will be described.

[0174] FIG. 15 is a diagram showing the scheduling of a physical uplink control channel.

[0175] Referring to FIG. 15, when the terminal receives DCI format 1_0, 1_1, or 1_2 that schedules a physical uplink control channel, it must transmit the scheduled physical uplink control channel. The physical uplink control channel includes UCI (uplink control information), and the UCI may include HARQ-ACK, SR, and CSI information. The HARQ-ACK information may be HARQ-ACK information regarding whether reception of two types of channels was successful. The first type may be HARQ-ACK regarding whether reception of the physical downlink shared channel (PDSCH) scheduled by the DCI format 1_0, 1_1, or 1_2 was successful. The second type may be HARQ-ACK regarding whether reception of the DCI format 1_0, 1_1, or 1_2 was successful when the DCI format 1_0, 1_1, or 1_2 is DCI that instructs release of the semi-persistent physical downlink shared channel (SPS PDSCH).

[0176] To transmit a PUCCH that conveys HARQ-ACK, the PDSCH-to-HARQ_ feedback timing indicator field included in the DCI format 1_0, 1_1, or 1_2 can indicate a K1 value that is a value for information on the slot in which the scheduled physical uplink control channel should be transmitted. Here, the value of K1 may be a non-negative integer value. The K1 value of DCI format 1_0 can indicate one value among {0, 1, 2, 3, 4, 5, 6, 7}. The K1 value that can be indicated by DCI format 1_1 or 1_2 may be configured or set by a higher layer.

[0177] The terminal can determine the slot for transmitting the uplink control channel including the first type of HARQ-ACK information as follows. The terminal can determine the uplink slot overlapping with the last symbol of the physical downlink shared channel (PDSCH) corresponding to the HARQ-ACK information. If the index of the uplink slot is m, the uplink slot for the terminal to transmit the physical uplink control channel including the HARQ-ACK information may be m + K1. Here, the index of the uplink slot is a value based on the subcarrier spacing of the uplink BWP where the uplink control channel is transmitted.

[0178] For reference, when downlink slot aggregation is configured, the terminal indicates that the last symbol is the last symbol of the PDSCH scheduled within the last slot among the slots in which the physical downlink shared channel (PDSCH) is received.

[0179] Referring to FIG. 15, assume that the subcarrier spacing of the DL BWP where the PDCCH is received, the subcarrier spacing of the DL BWP where the PDSCH is scheduled, and the subcarrier spacing of the UL BWP where the PUCCH is transmitted are the same. Assume that the terminal receives the PDCCH for scheduling the PDSCH and the PUCCH from the base station in slot n, and the K0 = 2 and K1 = 3 indicated by the DCI transmitted by the PDCCH. If the reception of the last symbol of the PDSCH ends in slot n + K0, that is, n + 2, the terminal must transmit the HARQ-ACK of the PDSCH via the PUCCH in slot n + 2 + K1, that is, n + 5.

[0180] In the NR system, in order to ensure wide coverage, the terminal may be configured to repeatedly transmit the long PUCCH (PUCCH format 1, 3, 4) in 2, 4, or 8 slots. When the terminal is configured to repeatedly transmit the PUCCH, the same UCI is repeatedly transmitted every slot. This will be described with reference to FIG. 16.

[0181] FIG. 16 is a diagram showing the retransmission of a physical uplink control channel.

[0182] Referring to FIG. 16, when the reception of the PDSCH ends in slot n and K1 = 2, the terminal transmits the PUCCH in slot n + K1, that is, n + 2. At this time, if the number of retransmission times for the PUCCH is configured and set to N repeat PUCCH = 4 for the terminal, the PUCCH is retransmitted from slot n + 2 to slot n + 5. The symbol configuration of the retransmitted PUCCH is the same. That is, the retransmitted PUCCH starts from the same symbol in each slot and is composed of the same number of symbols.

[0183] To obtain a diversity gain in the frequency domain, frequency hopping may be configured for the terminal. The frequency hopping may be configured with intra-slot frequency hopping that performs frequency hopping within a slot and inter-slot frequency hopping that performs frequency hopping for each slot. When intra-slot frequency hopping is configured for the terminal, the terminal bisects the PUCCH in the time domain in the slot where the PUCCH is transmitted, and transmits half of it on the first PRB and the remaining half on the scheduled second PRB. At this time, the first PRB and the second PRB may be configured for the terminal by a higher layer that configures the PUCCH resource. When inter-slot frequency hopping is configured for the terminal, the PUCCH is transmitted on the first PRB in slots where the slot index is even, and the PUCCH is transmitted on the second PRB in slots where the slot index is odd.

[0184] When the terminal performs PUCCH retransmission, if the symbol for transmitting PUCCH in a specific slot overlaps with the symbol position configured semi-statically for receiving a DL symbol or an SS / PBCH block, the terminal does not transmit PUCCH in that slot. Instead, it defers the transmission to the next slot and transmits PUCCH when the symbol position configured semi-statically for receiving a DL symbol or an SS / PBCH block in that slot does not overlap with the PUCCH symbol.

[0185] I. Dynamic PUCCH Carrier Switching and PUCCH Repetition

[0186] This embodiment relates to a method for dynamically configuring PUCCH carrier switching for a terminal and PUCCH retransmission.

[0187] A plurality of uplink cells may be configured for the terminal by the base station. If a plurality of uplink cells are configured for the terminal, this is referred to as UL CA (carrier aggregation). In UL CA, one of the plurality of uplink cells may be designated for PUCCH transmission by the terminal. The cell for transmitting the PUCCH is called the PUCCH cell or Pcell. The terminal can transmit PUCCH on the Pcell and cannot transmit PUCCH on the remaining cells. For reference, the PUCCH may be transmitted on a Pcell, a PS cell, or a PUCCH_S cell, which is one of the PUCCH groups. Therefore, in the following description, the Pcell may be rephrased as a PS cell or a PUCCH_S cell, and the plurality of uplink cells refers to the uplink cells within the PUCCH group including the Pcell / PS cell / PUCCH_S cell.

[0188] The Pcell of the terminal may be unable to transmit PUCCH for various reasons. For example, when a downlink symbol is set for the Pcell, the PUCCH overlapping with the downlink symbol cannot be transmitted. When the base station uses the resources of the Pcell for other uplink transmissions (e.g., PUSCH and PUCCH of other terminals), the Pcell will be short of resources and unable to transmit PUCCH on the Pcell.

[0189] To solve the problem that it is difficult to transmit PUCCH on the Pcell in this way, the base station can configure the terminal with dynamic PUCCH carrier switching. Dynamic PUCCH carrier switching refers to a method of changing the cell in which PUCCH is transmitted among multiple uplink cells in a UL CA situation. Specifically, the dynamic PUCCH carrier switching may be configured as follows. Hereinafter, among multiple cells, the serving cell in which PUCCH is transmitted is referred to as the PUCCH serving cell.

[0190] The base station can set the index of the cell used as the PUCCH serving cell among multiple cells for the terminal through the RRC signal. The parameters set by the RRC signal may include the index sequence of the PUCCH serving cell that collects the indexes of the cells used as the PUCCH serving cell among multiple cells, the period and offset to which the index sequence is applied. The index sequence of the cell is a set of indexes and may be provided in the form of a bitmap. The index sequence, period, and offset may be interpreted as follows.

[0191] For reference, unless otherwise specifically mentioned throughout this specification, it is interpreted that the offset is not set. When the offset is not set, the index sequence of the PUCCH serving cell is applied from the first slot of the frame.

[0192] (First Method) The period and offset of the index sequence of the PUCCH serving cell may be given in milliseconds. For example, if the period of the index sequence of the PUCCH serving cell is given as 4 and the offset is given as 1, the terminal can apply the period starting from 1 ms after the frame boundary with the period of the index sequence of the PUCCH serving cell being 4 ms. Here, the length of the index sequence of the PUCCH serving cell (i.e., the number of indexes included) may be the same as the number of slots within the period. If the period is P, the number of slots within the period is given as P * 2^mu. Here, mu is the subcarrier spacing configuration. Here, the number of slots within the period may vary depending on the subcarrier spacing. Therefore, considering the case where multiple cells have different subcarrier spacings respectively, the length of the index sequence of the PUCCH serving cell (i.e., the number of indexes included) according to a given period P may be determined as follows.

[0193] (Example 1 of Index Sequence Length) The length of the index sequence may be the same as the number of slots of the cell having the lowest subcarrier spacing within the period. Here, the reason for using the lowest subcarrier spacing is that since the slot length of the cell having the lowest subcarrier spacing is the longest, it can prevent the PUCCH serving cell from being changed in the middle of the slot. For example, assume that the first cell is 15 kHz and the second cell is 30 kHz. The terminal can select 15 kHz (mu = 0), which is the lowest subcarrier spacing, according to this embodiment. Therefore, the length of the index sequence of the PUCCH serving cell is P * 2^mu = P. Here, each index of the index sequence of the PUCCH serving cell corresponds to the length of one slot of the cell with the selected lowest subcarrier spacing. That is, each index of the index sequence of the PUCCH serving cell corresponds to the length of one slot (1 ms) with a 15 kHz subcarrier spacing.

[0194] (Example 2 of the Length of the Index Sequence) The length of the index sequence may be the same as the number of slots of the cell having the highest subcarrier spacing within the period. Here, the reason for using the highest subcarrier spacing is that since the slot length of the cell having the highest subcarrier spacing is the shortest, the PUCCH serving cell can be changed in the shortest unit. For example, assume that the first cell is 15 kHz and the second cell is 30 kHz. According to this embodiment, the terminal can select 30 kHz (mu = 1), which is the highest subcarrier spacing. Therefore, the length of the index sequence is P * 2^mu = P * 2. Here, each value of the index sequence corresponds to one slot of the cell with the selected highest subcarrier spacing. That is, each index of the index sequence of the PUCCH serving cell corresponds to the length (0.5 ms) of one slot with a 30 kHz subcarrier spacing.

[0195] (Example 3 of the Length of the Index Sequence) In the case of FR1 (frequency range 1), the length of the index sequence may be the same as the number of slots of the cell having a 15 kHz subcarrier spacing within the period. In the case of FR2 (frequency range 2), it may be the same as the number of slots of the cell having a 60 kHz subcarrier spacing within the period. That is, the lowest subcarrier spacing among the subcarrier spacings capable of uplink transmission in each FR (frequency range) may be used. Using a 15 kHz subcarrier spacing in FR1 means that since the slot length is 1 ms, it is the same as changing the PUCCH serving cell every 1 ms. That is, the PUCCH serving cell may be changed every 1 ms according to the index sequence of the PUCCH serving cell. This has nothing to do with the subcarrier spacing (subcarrier spacing) set for the cell.

[0196] The length of the index sequence may be the same as the number of slots of a specific cell within the period. Here, the specific cell may be the Pcell when dynamic PUCCH carrier switching is not set. Here, the specific cell may be the cell having the lowest cell index among a plurality of cells. Thus, it may operate and be interpreted based on one specific cell. The length of the index sequence can be determined using the subcarrier spacing of one specific cell.

[0197] (Period setting method) In the above first method, the terminal receives from the base station the period and offset set in milliseconds by the RRC signal. However, even if another period and offset are not set for the terminal by the RRC signal from the base station, the terminal can infer the period and offset from other parameters set for itself. A specific method therefor is disclosed.

[0198] As an example, the terminal can determine the period and offset based on the TDD configuration of each TDD cell.

[0199] The terminal may have the TDD configuration of each TDD cell set by the base station. More specifically, the terminal can receive tdd-UL-DL-ConfigurationCommon that sets the cell-common TDD configuration by means of SIB1 (system information block 1) or the RRC parameter ServingCellConfigCommon. From the tdd-UL-DL-ConfigurationCommon, the terminal can know the period during which the TDD configuration can be applied and the reference subcarrier spacing in each TDD cell. Here, the reference subcarrier spacing can be obtained from the RRC parameter referenceSubcarrierSpacing. The TDD configuration provided by tdd-UL-DL-ConfigurationCommon includes at most two TDD patterns, and each pattern may include each period. Therefore, when up to two TDD patterns are set for one TDD cell in the terminal, the period of the TDD configuration is the sum of the period of the first pattern and the period of the second pattern. For reference, the period (hereinafter referred to as P. The period set by the TDD configuration (configured by tdd-UL-DL-ConfigurationCommon) is in milliseconds) set by the TDD configuration (configured by tdd-UL-DL-ConfigurationCommon) is set in milliseconds. And only P values that satisfy 20 / P being an integer can be set. The P value may be at least one value among 0.5 ms, 0.625 ms, 1 ms, 1.25 ms, 2 ms, 2.5 ms, 5 ms, and 10 ms. The number of slots according to the reference subcarrier spacing is S = P * 2^mu_ref. Here, mu_ref is the reference subcarrier spacing configuration. (For reference, the reference subcarrier spacing is 15 kHz * 2^mu_ref.).

[0200] The terminal may have a TDD configuration set individually and independently for each TDD cell. That is, the period according to the TDD configuration may be different for each cell. In this case, the period of the RRC signal regarding the index of the cell used as the PUCCH serving cell among a plurality of cells may be determined as follows.

[0201] As an example, the terminal can use the period P value of the TDD configuration of a specific cell as the period of the RRC signal regarding the cell used as the PUCCH serving cell. That is, the terminal can repeatedly apply the index sequence of the PUCCH serving cell among a plurality of cells for each TDD configuration period of the specific cell. For reference, the length of the index sequence of the PUCCH serving cell among a plurality of cells may be the same as P*2^mu_ref. Here, mu_ref is the reference subcarrier spacing of the TDD configuration of the specific cell.

[0202] On one aspect, the specific cell may be the Pcell. That is, the terminal can use the period P_pcell value of the TDD configuration of the Pcell as the period of the RRC signal regarding the cell used as the PUCCH serving cell among a plurality of cells. That is, the terminal can repeatedly apply the index sequence of the PUCCH serving cell among a plurality of cells for each TDD configuration period of the Pcell. For reference, the length of the index sequence of the PUCCH serving cell among a plurality of cells may be the same as P_pcell*2^mu_ref_pcell. Here, mu_ref_pcell is the reference subcarrier spacing of the TDD configuration of the Pcell.

[0203] On another aspect, the specific cell may be determined by the subcarrier spacing.

[0204] In yet another aspect, the specific cell may be the cell with the lowest subcarrier spacing. That is, the terminal can use the period P_low value of the TDD configuration of the cell with the lowest subcarrier spacing as the period of the RRC signal for the cell used as the PUCCH serving cell among the plurality of cells. That is, the terminal can repeatedly apply the index sequence of the PUCCH serving cell among the plurality of cells for each TDD configuration period of the cell with the lowest subcarrier spacing. For reference, the length of the index sequence of the PUCCH serving cell among the plurality of cells may be the same as P_low * 2^mu_ref_low. Here, mu_ref_low is the reference subcarrier spacing of the TDD configuration of the cell with the lowest subcarrier spacing. For reference, if there are multiple cells with the lowest subcarrier spacing and there are multiple periods of the TDD configuration of said cells, one of the periods may be selected.

[0205] In yet another aspect, the specific cell may be the cell with the highest subcarrier spacing. That is, the terminal can use the period P_high value of the TDD configuration of the cell with the highest subcarrier spacing as the period of the RRC signal for the cell used as the PUCCH serving cell among the plurality of cells. That is, the terminal can repeatedly apply the index sequence of the PUCCH serving cell among the plurality of cells for each TDD configuration period of the cell with the highest subcarrier spacing. For reference, the length of the index sequence of the PUCCH serving cell among the plurality of cells may be the same as P_high * 2^mu_ref_high. Here, mu_ref_high is the reference subcarrier spacing of the TDD configuration of the cell with the highest subcarrier spacing. For reference, if there are multiple cells with the highest subcarrier spacing and there are multiple periods of the TDD configuration of said cells, one of the periods can be selected.

[0206] In yet another aspect, the specific cell may be determined by the period of the TDD configuration.

[0207] In yet another aspect, the specific cell may be the cell with the longest period. That is, the terminal can use the period P_long value of the cell with the longest TDD configuration period among the cells as the period of the RRC signal for the cell used as the PUCCH serving cell among the plurality of cells. That is, the terminal can repeatedly apply the index sequence of the PUCCH serving cell among the plurality of cells for each TDD configuration period of the cell with the longest period. For reference, the length of the index sequence of the PUCCH serving cell among the plurality of cells may be the same as P_long * 2^mu_ref_long. Here, mu_ref_long is the reference subcarrier spacing of the TDD configuration of the cell with the longest period.

[0208] In yet another aspect, the specific cell may be the cell with the shortest period. That is, the terminal can use the period P_short value of the cell with the shortest TDD configuration period among the cells as the period of the RRC signal for the cell used as the PUCCH serving cell among the plurality of cells. That is, the terminal can repeatedly apply the index sequence of the PUCCH serving cell among the plurality of cells for each TDD configuration period of the cell with the shortest period. For reference, the length of the index sequence of the PUCCH serving cell among the plurality of cells may be the same as P_short * 2^mu_ref_short. Here, mu_ref_short is the reference subcarrier spacing of the TDD configuration of the cell with the shortest period.

[0209] As another example, based on the combination of the cycle P values of the TDD configuration of the cell, the period of the RRC signal related to the cell used as the PUCCH serving cell may be determined. That is, the terminal can use the combination of the cycle P values of the TDD configuration of the cell as the period of the RRC signal related to the cell used as the PUCCH serving cell. The terminal can have periods P_1, P_2, ···, P_N according to the TDD configuration for each TDD cell. The terminal can determine the period of the RRC signal related to the cell used as the PUCCH serving cell based on the least common multiple value of the above periods. That is, the period of the RRC signal related to the cell used as the PUCCH serving cell may be the least common multiple value of P_1, P_2, ···, P_N. Let this least common multiple value be P_lcm. The terminal can repeatedly apply the index sequence of the PUCCH serving cell among the plurality of cells every P_lcm ms. For reference, the length of the index sequence of the PUCCH serving cell among the plurality of cells may be the same as P_lcm * 2^mu_ref_lcm. Here, mu_ref_lcm may be determined by the smallest value or the largest value among the reference subcarrier spacings of the TDD configurations of each TDD cell, or the value of the reference subcarrier spacing of the TDD configuration of Pcell.

[0210] For example, assume that the period of the first cell is 1 ms, the reference subcarrier spacing is 60 kHz, the period of the second cell is 2 ms, the reference subcarrier spacing is 30 kHz, the period of the third cell is 5 ms, and the reference subcarrier spacing is 15 kHz. The terminal can determine the least common multiple P_lcm = 10 ms among the periods of 1 ms, 2 ms, and 5 ms as the period of the RRC signal related to the cell used as the PUCCH serving cell. And mu_ref_lcm = 1 can be determined by the lowest subcarrier spacing of 15 kHz among the reference subcarrier spacings of the cells. Therefore, the length of the index sequence of the PUCCH serving cell may be P_lcm * 2^mu_ref_lcm = 10 * 2^0 = 10. That is, each index indicates the index of the cell used as the PUCCH serving cell within the length of one slot of 15 kHz (i.e., 1 ms).

[0211] As another example, the terminal can determine the period of the RRC signal related to the cell used as the PUCCH serving cell to be fixed at 20 ms. For reference, the period P according to the TDD configuration of each TDD cell satisfies the condition that 20 / P is an integer. Therefore, 20 ms is an integer multiple value of the period according to the TDD configuration of each TDD cell. The terminal can repeatedly apply the index sequence of the PUCCH serving cell among the multiple cells every 20 ms. For reference, the length of the index sequence of the PUCCH serving cell among the multiple cells may be the same as 20 * 2^mu_ref_lcm. Here, mu_ref_lcm may be determined by the smallest value or the largest value among the reference subcarrier spacings of the TDD configurations of each TDD cell or the value of the reference subcarrier spacing of the TDD configuration of Pcell.

[0212] For example, assume that the period of the first cell is 1 ms, the reference subcarrier spacing is 60 kHz, the period of the second cell is 2 ms, the reference subcarrier spacing is 30 kHz, the period of the third cell is 5 ms, and the reference subcarrier spacing is 15 kHz. At this time, the terminal can determine 20 ms as the period of the RRC signal related to the cell used as the PUCCH serving cell. And mu_ref_lcm = 1 can be determined by the lowest subcarrier spacing of 15 kHz among the reference subcarrier spacings of the cells. Therefore, the length of the index sequence of the PUCCH serving cell may be 20 * 2^mu_ref_lcm = 20 * 2^0 = 20. That is, each index indicates the index of the cell used as the PUCCH serving cell within the length of one slot of 15 kHz (i.e., 1 ms).

[0213] Hereinafter, this embodiment will be described in more detail with reference to FIGS. 17 to 19.

[0214] FIG. 17 is a diagram showing a situation where two cells capable of uplink transmission are set in a terminal according to an example.

[0215] Referring to FIG. 17, two cells, cell 0 and cell 1, capable of uplink transmission are set in the terminal.

[0216] Cell 0 has a subcarrier spacing of 15 kHz and a period of 5 ms according to the TDD configuration. More specifically, there are 5 slots with a subcarrier spacing of 15 kHz in 5 ms. Among the 5 slots, the previous 3 slots are DL slots, the next slot is an S slot, and the last slot is a UL slot. Here, a DL slot is a slot containing only DL symbols, a UL slot is a slot containing only UL symbols, and an S slot is a slot containing at least one flexible symbol. Among the N symbol symbols of the S slot, the previous A DL symbols, the next B UL symbols, and N symbol- It may be composed of (A + B) flexible symbols. Here, A and B are integers greater than 0, and N symbol may be 14 or 12 depending on the type of CP (cyclic prefix). For cell 0, an offset is applied only for one slot with a subcarrier spacing of 15 kHz. Therefore, slot 0 of cell 0 starts from the second slot among the five slots within one period of the TDD configuration.

[0217] For cell 1, according to the TDD configuration, the subcarrier spacing is 30 kHz and the period is 2.5 ms. More specifically, there are five slots with a subcarrier spacing of 30 kHz in 2.5 ms. Among the five slots, the first three are DL slots, the next slot is an S slot, and the last slot is a UL slot. No separate offset is applied to cell 1. Therefore, slot 0 of cell 1 starts from the first slot among the five slots within one period of the TDD configuration.

[0218] FIG. 18 is a diagram for explaining a method of determining a PUCCH serving cell based on a low subcarrier spacing according to an example, and FIG. 19 is a diagram for explaining a method of determining a PUCCH serving cell based on a high subcarrier spacing. 5 ms, which is the least common multiple of the period of cell 0 and the period of cell 1, can be determined as the period of the index sequence of the PUCCH serving cell.

[0219] Referring to FIG. 18, based on the lowest subcarrier spacing of 15 kHz among the subcarrier spacings of cell 0 and cell 1, the index sequence of the PUCCH serving cell is generated. Here, since the number of 15 kHz slots within a 5 ms period is 5, the index sequence of the PUCCH serving cell may be composed of 5 indices. Among the 5 indices, each index indicates the index of the PUCCH serving cell within the length (1 ms) of the 15 kHz slot at 5 ms. For example, the index sequence of the PUCCH serving cell may be given as

[1101] . Thus, from the frame boundary to 0 - 1 ms, based on the first index "0" of the index sequence, cell 0 is the PUCCH serving cell; from 1 - 2 ms, based on the second index "1" of the index sequence, cell 1 is the PUCCH serving cell; from 2 - 3 ms, based on the third index "1" of the index sequence, cell 1 is the PUCCH serving cell; from 3 - 4 ms, based on the second index "0" of the index sequence, cell 0 is the PUCCH serving cell; from 4 - 5 ms, based on the second index "1" of the index sequence, cell 1 is the PUCCH serving cell. Thereafter, the indices are repeated in a 5 ms cycle. For reference, within 1 ms, there may be 2 slots with a 30 kHz subcarrier spacing of cell 1. Therefore, the index of the PUCCH serving cell is applied by grouping 2 slots with a 30 kHz subcarrier spacing of cell 1 together.

[0220] Referring to FIG. 19, a PUCCH serving cell index sequence is generated based on the highest subcarrier spacing of 30 kHz among the subcarrier spacings of cell 0 and cell 1. Here, since the number of 30 kHz slots within a 5 ms period in the PUCCH serving cell index sequence is 10, it may be composed of 10 indexes. Among the 10 indexes, each index indicates the index of the PUCCH serving cell within the length of a 30 kHz slot (0.5 ms) within 5 ms. For example, the PUCCH serving cell index sequence may be given as [0001100011]. Thus, from the frame boundary to 0 - 0.5 ms, based on the first index "0" of the index sequence, cell 0 is the PUCCH serving cell; from 0.5 - 1 ms, based on the second index "0" of the index sequence, cell 0 is the PUCCH serving cell; from 1 - 1.5 ms, based on the third index "0" of the index sequence, cell 0 is the PUCCH serving cell; from 1.5 - 2 ms, based on the fourth index "1" of the index sequence, cell 1 is the PUCCH serving cell; from 2 - 2.5 ms, based on the fifth index "1" of the index sequence, cell 1 is the PUCCH serving cell; from 2.5 - 3 ms, based on the sixth index "0" of the index sequence, cell 0 is the PUCCH serving cell; from 3 - 3.5 ms, based on the seventh index "0" of the index sequence, cell 0 is the PUCCH serving cell; from 3.5 - 4 ms, based on the eighth index "0" of the index sequence, cell 0 is the PUCCH serving cell; from 4 - 4.5 ms, based on the ninth index "1" of the index sequence, cell 1 is the PUCCH serving cell; from 4.5 - 5 ms, based on the tenth index "1" of the index sequence, cell 1 is the PUCCH serving cell. Thereafter, the indexes are repeated in a 5 ms cycle as described above.For reference, within 0.5 ms, only half of the slots with a 15 kHz subcarrier spacing in cell 0 may be included. Therefore, the index of the PUCCH serving cell is applied to each half of the slots with a 15 kHz subcarrier spacing in cell 0.

[0221] In the description of the above first method, when a sub-slot is set for one cell, in the first method, the slot may be interpreted as an alternative to the sub-slot. For example, when generating Q sub-slots by grouping N symbols of one slot together, the length of the index sequence may increase by Q times. And if one index of the index sequence indicates a PUCCH serving cell within D ms, it can be interpreted as indicating a PUCCH serving cell within D / Q ms.

[0222] (Second method) As yet another example, the length of the index sequence of the PUCCH serving cell may be determined by the period and the length of time to which the index sequence is applied. More specifically, the length of the index sequence of the PUCCH serving cell may be determined as (the period) / (the length of time to which the index sequence is applied). Here, (the period) / (the length of time to which the index sequence is applied) is a natural number. That is, the length of time to which the index sequence of the PUCCH serving cell is applied is a divisor of the period, and the period is a multiple of the length of time to which the index sequence is applied. The length of time to which the index sequence is applied may have a unit of ms and may be set by the base station for the terminal or may be analogized as follows.

[0223] (Example 4 of the length of the index sequence) The length of the index sequence may be the same as the length of the slots of a specific cell within the period. Here, the specific cell may be the cell that is the Pcell when dynamic PUCCH carrier switching is not set. Here, the specific cell may be the cell having the lowest cell index among a plurality of cells. In this way, it may be operated and interpreted based on one specific cell.

[0224] Additionally, the index sequence of the PUCCH serving cell may be limited to cells having the same subcarrier spacing. That is, even if cells having different subcarrier spacings are set for the terminal, the Pcell by dynamic PUCCH carrier switching may be limited to cells having the same subcarrier spacing. By such a limitation, the problem with respect to the above-described index sequence length can be solved.

[0225] FIG. 20 is a diagram showing dynamic PUCCH carrier switching according to an embodiment.

[0226] Referring to FIG. 20, the terminal can perform dynamic PUCCH carrier switching as follows. Here, it is assumed that the length of the index sequence of the PUCCH serving cell is determined by (Index Sequence Length Example 1). The terminal may be set with a cell having a 15 kHz subcarrier spacing and a cell having a 30 kHz subcarrier spacing. Here, the index of the cell having a 15 kHz subcarrier spacing is 0, and the index of the cell having a 30 kHz subcarrier spacing is 1. The terminal is set with a period of 4 ms and an offset of 1 ms. In this case, the length of the index sequence of the PUCCH serving cell is 4. This is because 4 slots of the cell having a 15 kHz subcarrier spacing may be included within 4 ms. The terminal may set

[0010] with a length of 4 as the index sequence of the PUCCH serving cell. In this case, based on the index of the 15 kHz subcarrier cell, in slots 1, 2, and 4, cell 0 is the Pcell, and in slot 3, it is not the Pcell. Here, since slot 3 of cell 0 is not the Pcell, PUCCH is not transmitted in slot 3 of cell 0. Based on the index of the 30 kHz subcarrier cell, slots 6 and 7 are the Pcell, and slots 2, 3, 4, 5, 8, and 9 are not the Pcell. Here, since slots 2, 3, 4, 5, 8, and 9 of cell 1 are not the Pcell, PUCCH is not transmitted in slots 2, 3, 4, 5, 8, and 9 of cell 1.

[0227] In the above-mentioned first method and second method, the index of the PUCCH serving cell is included in the index sequence for all slots. However, for some slots, it may not be necessary to include them in the index sequence.

[0228] For example, referring to FIG. 17, assume that cell 0 is the Pcell. Since slot 3 with a 15 kHz subcarrier spacing of cell 0 is a UL slot (a slot containing only UL symbols), PUCCH transmission is possible in the UL slot. Therefore, it is not necessary to include it in the index sequence for the UL slot of the Pcell. In this case, the UL slot of the Pcell is always determined as the PUCCH serving cell. By this method, the length of the index sequence can be reduced.

[0229] Alternatively, referring to FIG. 17, assume that the terminal assumes that cell 0 is the Pcell. Slot 0 with a 15 kHz subcarrier spacing of cell 0 is a DL slot (a slot containing only DL symbols), and slots 0 and 1 with a 30 kHz subcarrier spacing of cell 1 overlapping with it are also DL slots. Therefore, no matter which cell is indicated as the PUCCH serving cell, transmission is impossible for both cells, so the indication is meaningless. Therefore, if all the slots of the cells that can be indicated by one index of the index sequence are DL slots, the index may be excluded from the index sequence. By this method, the length of the index sequence can be reduced.

[0230] On the other hand, the base station may indicate only a part of the index sequence of some PUCCH serving cells. For example, let the index sequence of the PUCCH serving cell with a length of L indicated to the terminal be [i0, i1, ···, i L-1 . The base station may indicate a part of the index sequence to the terminal as follows. The base station can indicate (l, i l )-pair to the terminal. Here, l is the position in the index sequence of the PUCCH serving cell and can have a value from 0 to L - 1. i lrepresents the index value of position l in the index sequence of the PUCCH serving cell. For example, referring to FIG. 18, when the base station wants to instruct the terminal with

[1101] as the index sequence of the PUCCH serving cell, the base station can instruct the terminal with (1,1), (2,1), (4,1). The index of the position not indicated by the pair can be assumed to be the index of the Pcell.

[0231] Furthermore, when there are two cells capable of uplink transmission and one cell is the Pcell, the terminal, when the pair (l,i l ) is indicated, i l may be omitted. For example, referring to FIG. 18, when the base station wants to instruct the terminal with

[1101] as the index sequence of the PUCCH serving cell, the base station can instruct the terminal with (1), (2), (4). That is, the position indicating a cell that is not the Pcell in the index sequence can be indicated. It can be assumed that the index of the Pell is indicated for positions other than the indicated position. If there are more than two cells capable of uplink transmission, the base station can select and configure two uplink cells for the terminal. Here, one uplink cell includes the Pcell.

[0232] Unless otherwise specifically mentioned in this specification, index 0 indicates the Pcell. And for cells other than the Pcell, another index may be set. This may be the value of SCellIndex in SCellConfig of CellGroupConfig IE.

[0233] In the present invention, index 0 always indicates the Pcell. For cells other than the Pcell, another index may be set. The base station can select some of the cells in the PUCCH group as PUCCH serving cell candidates. For example, cells having the same subcarrier spacing as the Pcell may be included in the PUCCH serving cell candidates. Cells excluded from the selection are cells where PUCCH transmission is not possible. The base station can newly assign an index to the PUCCH serving cell candidates. Here, the index can be assigned with a natural number other than 0. This is because the base station can set the index to the terminal by another RRC signal. As another example, the new index of the selected PUCCH serving cell candidates may be assigned from 1 in ascending order of the unique SCellIndex value of each candidate cell as a natural number.

[0234] For reference, among the cells in the PUCCH group, the terminal may include a Supplementary UL (SUL) cell. In this case, another index may be further assigned to the SUL cell.

[0235] Another technical problem of the present invention relates to a method for retransmitting PUCCH when dynamic PUCCH carrier switching is set in a terminal.

[0236] Referring to FIG. 20, assume that the terminal is instructed to transmit PUCCH in slot 1. At this time, the base station can set the terminal to retransmit the PUCCH 4 times for high reliability and coverage. In this case, the terminal must determine 4 slots for retransmitting the PUCCH. Before describing an embodiment of the present invention, referring to the 3GPP official document TS38.213, the terminal determines the slot in which the PUCCH was transmitted as follows.

[0237] In the case of an unpaired spectrum (a cell using TDD), the terminal determines N slots (N = 4 in the above example) from the slot (slot 1 in the above example) in which PUCCH transmission is indicated. If the symbol in which PUCCH transmission is indicated in a slot is an uplink symbol or a flexible symbol not configured as an SS / PBCH block, the slot is determined to be a slot in which PUCCH transmission is possible. In this way, N slots may be determined.

[0238] In the case of a paired spectrum (a cell using FDD (frequency division duplex)), the terminal determines N consecutive slots (N = 4 in the above example) from the slot (slot 1 in the above example) in which PUCCH transmission is indicated.

[0239] As described above, in the operation defined in TS38.213, it is not possible to determine the slot for transmitting PUCCH in consideration of dynamic PUCCH carrier switching. In the present invention, the following method is disclosed to solve this problem.

[0240] (First Embodiment of PUCCH Repeated Transmission) The terminal performs PUCCH repeated transmission in one cell and does not transmit repeatedly in other cells. In other words, when the Pcell is changed by dynamic PUCCH carrier switching, the slot of the changed Pcell is not included in the slots for transmitting PUCCH. Here, the one cell that performs PUCCH repeated transmission is the Pcell corresponding to the first slot in which PUCCH repeated transmission is indicated. This will be described in detail with reference to FIG. 21.

[0241] FIG. 21 is a diagram showing PUCCH transmission by dynamic PUCCH carrier switching according to an embodiment of the present invention.

[0242] Referring to FIG. 21, the terminal may be instructed to perform PUCCH transmission in slot 1 of cell 0. Here, slot 1 of cell 0 is the Pcell where PUCCH transmission is possible. The terminal must determine 4 slots for PUCCH iterative transmission starting from the said slot 1. At this time, the terminal may be limited to the Pcell slots of cell 0. Here, the Pcell slots of cell 0 refer to the slots when cell 0 is the Pcell. That is, PUCCH may be repeatedly transmitted in slots 1, 2, 4, and 5. Slot 3 may be excluded because the Pcell has been changed to cell 1.

[0243] For reference, when determining the slots for transmitting PUCCH in cell 0, as previously defined in TS38.213, flexible symbols that do not overlap with UL symbols and SS / PBCH blocks can be considered. For the sake of convenience of explanation, this process is omitted.

[0244] When PUCCH is repeatedly transmitted only in one cell as in the first embodiment, additional delay may occur in completing PUCCH iterative transmission. If the Pell changes frequently, such additional delay may further increase. In particular, such delay is not suitable for services that require low delay.

[0245] (Second Embodiment of PUCCH Iterative Transmission) The terminal performs PUCCH iterative transmission in one cell and does not transmit repeatedly in other cells. Here, the said PUCCH iterative transmission ignores the change of the Pcell by dynamic PUCCH carrier switching. Here, the one cell where PUCCH iterative transmission is performed is the Pcell corresponding to the first slot where PUCCH iterative transmission is instructed. This will be described in detail with reference to FIG. 22.

[0246] FIG. 22 is a diagram showing PUCCH transmission by dynamic PUCCH carrier switching according to another embodiment of the present invention.

[0247] Referring to FIG. 22, the terminal may be instructed to perform PUCCH transmission in slot 1 of cell 0. Here, slot 1 of cell 0 is a Pcell where PUCCH transmission is possible. The terminal must determine four slots for PUCCH repeated transmission starting from the said slot 1. At this time, the terminal may be limited to the slots of cell 0. Different from the first embodiment, it is not limited to the Pcell slots of cell 0. Here, four slots are determined regardless of whether it is a Pcell or not. That is, PUCCH may be repeatedly transmitted in slots 1, 2, 3, and 4. In the case of slot 3, the Pcell is changed to cell 1, but it is not applied in PUCCH repeated transmission.

[0248] In the second embodiment, PUCCH may be repeatedly transmitted in a slot that is not a Pcell slot. There may be other PUCCH transmissions in the said slot. The other PUCCH transmissions may be transmitted as follows. As a first method, the other PUCCH transmissions may be transmitted on a Pcell determined by dynamic PUCCH carrier switching. For example, in FIG. 22, other PUCCH may be transmitted in slots 6 and 7 of cell 1. That is, from the perspective of other PUCCH, slots 6 and 7 of cell 1 are Pcell slots where PUCCH transmission is possible. As a second method, the other PUCCH transmissions may also be transmitted in the slots where PUCCH is repeatedly transmitted. In FIG. 22, other PUCCH is not transmitted in slots 6 and 7 of cell 1, and other PUCCH may be transmitted in slot 3 of cell 0. That is, from the perspective of other PUCCH, slot 3 of cell 0 is a Pcell slot. In this way, the slot determined for PUCCH transmission by PUCCH repeated transmission may become a Pcell slot.

[0249] (Third Embodiment of PUCCH Repeated Transmission) In the above first and second embodiments, PUCCH is repeatedly transmitted in one cell. In the third embodiment of the present invention, the terminal can repeatedly transmit PUCCH on a Pcell determined by dynamic PUCCH carrier switching.

[0250] More specifically, if the Pcell is changed to a cell having the same subcarrier spacing, PUCCH retransmission is possible in the changed Pcell.

[0251] FIG. 23 is a diagram showing PUCCH transmission by dynamic PUCCH carrier switching according to still another embodiment of the present invention.

[0252] Referring to FIG. 23, three uplink cells may be configured for the terminal. Compared with FIGS. 20, 21, and 22, a new cell 2 is further configured. Here, the new cell 2 has a 15 kHz subcarrier spacing. Here, it is assumed that the index sequence of the PUCCH serving cell is

[0210] . According to the cell index sequence, slots 1, 4, 5, 8,... of cell 0 are Pcell slots, slots 6, 7,... of cell 1 are Pcell slots, and slot 2 of cell 2 is a Pcell slot.

[0253] The terminal may be instructed to perform PUCCH transmission in slot 1 of cell 0. Here, slot 1 of cell 0 is a Pcell where PUCCH transmission is possible. The terminal must determine four slots for PUCCH retransmission starting from the said slot 1. At this time, the terminal may be limited to the Pcell slots of the cell having the same subcarrier spacing as that of cell 0. That is, here, since the subcarrier spacings of cell 0 and cell 2 are the same, the Pcell slots of cell 0 and cell 2 are slots where PUCCH retransmission is possible. That is, PUCCH may be repeatedly transmitted in slots 1, 4, 5 of cell 0 and slot 2 of cell 2. Here, although slots 6, 7 of cell 1 are Pcell slots, they are excluded from the slots for PUCCH retransmission because the subcarrier spacing is different from that of cell 0.

[0254] (Fourth Embodiment of PUCCH Repeated Transmission) In the above-described third embodiment, PUCCH was repeatedly transmitted only in cells having the same subcarrier spacing. However, in dynamic PUCCH carrier switching between cells having different subcarrier spacings, a delay may still occur. The fourth embodiment of the present invention for solving this problem is as follows.

[0255] FIG. 24 is a diagram showing PUCCH transmission by dynamic PUCCH carrier switching according to still another embodiment of the present invention.

[0256] Referring to FIG. 24, the terminal may include a Pcell slot by dynamic PUCCH carrier switching as a slot for PUCCH repeated transmission. The terminal may be instructed to perform PUCCH transmission in slot 1 of cell 0. Here, slot 1 of cell 0 is a Pcell capable of PUCCH transmission. The terminal must determine four slots for PUCCH repeated transmission starting from the said slot 1. Here, the slots capable of PUCCH repeated transmission are slot 1 and 2 of cell 0, and slot 6 and 7 of cell 1. Here, slot 1 and 2 of cell 0 and slot 6 and 7 of cell 1 are Pcell slots.

[0257] In this case, the PUCCH repeatedly transmitted in cell 0 and cell 1 has the same symbol assignment. That is, if it starts from symbol S in the slot and has a length of L in cell 0, it also starts from symbol S in the slot and has a length of L in cell 1. Also, the PUCCH repeatedly transmitted in cell 0 and cell 1 has the same PRB assignment. That is, if it starts from PRB S and has a length of L in cell 0, it also starts from PRB S and has a length of L in cell 1. If inter-cell frequency hopping is set, the start PRB of the said PUCCH may be determined by frequency hopping.

[0258] Still another technical problem of the present invention relates to a method for interpreting the K1 value. The terminal may be set or instructed with a K1 value for determining a slot in which HARQ-ACK of the PDSCH is transmitted by an RRC signal or a DCI format. The K1 value is in units of slots according to the subcarrier spacing of the cell in which the PUCCH is transmitted (if a sub-slot is set, the K1 value is in units of sub-slots).

[0259] Referring to FIGS. 16 to 18, one of the cells having different subcarrier spacings from each other may be designated as the PUCCH serving cell. Therefore, when interpreting the K1 value, the terminal needs a method for interpreting the K1 value because the subcarrier spacing of the PUCCH serving cell may be different. A detailed solution thereto will be disclosed below.

[0260] According to the first method, the subcarrier spacing for interpreting the K1 value follows the subcarrier spacing of the Pcell. That is, the terminal can determine a slot for transmitting the PUCCH including HARQ-ACK based on the subcarrier spacing of the Pcell.

[0261] According to the second method, the subcarrier spacing for interpreting the K1 value follows one of the subcarrier spacings of the candidates of the PUCCH serving cell. For example, it may follow the lowest subcarrier spacing or the highest subcarrier spacing.

[0262] According to the third method, the subcarrier spacing for interpreting the K1 value may be set by the base station for the terminal. This may be the same as or different from the subcarrier spacing of the Pcell.

[0263] If it is indicated that PUCCH is to be transmitted in a slot to a cell other than the Pcell by the slot, the terminal can transmit PUCCH in the slot of the PUCCH serving cell overlapping with the slot. Here, if there is one slot of the PUCCH serving cell, PUCCH is transmitted in the slot. If there are two or more slots of the PUCCH serving cell, PUCCH is transmitted in one of the slots. The method for determining the one slot is as follows.

[0264] As an example, the terminal can select the earliest slot among the slots. By selecting the earliest slot in time, the terminal can transmit PUCCH at the earliest time to reduce the delay. The PUCCH resource in the slot may be determined by the PUCCH resource indicator indicated by the RRC configuration or the DCI format. If the PUCCH resource determined by the PUCCH resource indicator in the slot overlaps with a symbol in which uplink transmission is not possible, the PUCCH may be dropped without being transmitted.

[0265] As another example, the terminal can select the earliest slot among the slots in which PUCCH transmission is possible from among the slots. In the previous example, the terminal determined the slot and judged whether PUCCH resource transmission was possible. If transmission is not possible in this process, the PUCCH is dropped without being transmitted. To prevent this, the terminal first determines the PUCCH resource using the PUCCH resource indicator indicated by the RRC configuration or the DCI format. If the PUCCH resource can be transmitted in the earliest slot among the slots, the terminal transmits PUCCH in the earliest slot in time. If transmission is not possible in the earliest slot in time, the terminal can determine whether the PUCCH resource can be transmitted in the next slot. In this way, PUCCH can be transmitted in the earliest slot in time as much as possible to prevent unnecessary PUCCH drops.

[0266] II. SPS PDSCH Reception and HARQ-ACK Transmission Method

[0267] Using FIGS. 25 and 26, a method for a terminal to receive a physical downlink control channel and a physical downlink shared channel, and a method for transmitting a physical uplink control channel and a physical uplink shared channel will be described.

[0268] FIG. 25 is a diagram showing an example of scheduling of a physical downlink shared channel.

[0269] Referring to FIG. 25, a terminal can receive a physical downlink control channel transmitted from a base station. For receiving the downlink control channel, information such as a control resource set (CORESET) or a search space may be configured.

[0270] The control resource set includes information on a frequency region in which a physical downlink control channel should be received. More specifically, the information of the control resource set may include an index of a PRB or a set of PRBs and the number of consecutive symbols in which a terminal should receive a physical downlink control channel. Here, the number of consecutive symbols is one of 1, 2, and 3.

[0271] A search space includes time information for receiving a set of PRBs indicated by the control resource set. More specifically, the information of the search space may include at least one of periodicity and offset. Here, the periodicity or offset may be indicated in units of a slot or a sub-slot or a symbol or a set of symbols or a set of slots. Further, the information of the search space may include a CCE aggregation level received by a terminal, the number of PDCCHs monitored for each CCE aggregation level, a search space type, or DCI format or RNTI information to be monitored.

[0272] The CCE aggregation level has at least one value among 1, 2, 4, 8, and 16. The terminal can monitor PDCCH with the same number of CCEs as the value of the CCE aggregation level.

[0273] The search space types are a common search space (CSS) and a UE-specific search space. The common search space is a search space where all terminals in a cell or some terminals in a cell commonly monitor PDCCH. The terminal can monitor and receive PDCCH candidates (for example, PDCCH that transmits DCI having a CRC scrambled by at least one RNTI among SI-RNTI, RA-RNTI, MsgB-RNTI, P-RNTI, TC-RNTI, INT-RNTI, SFI-RNTI, TPC-PUSCH-RNTI, TPC-PUCCH-RNTI, TPC-SRS-RNTI, CI-RNTI, C-RNTI, MCS-C-RNTI, CS-RNTI, or PS-RNTI) broadcast to all terminals in the cell or some terminals in the cell in this search space. In the UE-specific search space, the terminal can monitor and receive PDCCH candidates (for example, PDCCH that transmits DCI having a CRC scrambled by at least one RNRTI among C-RNTI, MCS-C-RNTI, SP-CSI-RNTI, CS-RNTI, SL-RNTI, SL-CS-RNTI, or SL-L-CS-RNTI). Also, the terminal can receive PDCCH that transmits DCI indicating reception of a physical downlink shared channel, transmission of a physical uplink control channel, or transmission of a physical uplink shared channel in the common search space and the UE-specific search space.

[0274] The DCI formats monitored by a terminal for which the physical uplink shared channel transmission and the physical downlink shared channel reception are scheduled from a base station may be DCI format 0_0, 0_1, 0_2, 1_0, 1_1, or 1_2. The RNTI information may include at least one of CS-RNTI, MCS-C-RNTI, and C-RNTI in DCI format 0_0, 0_1, 0_2, 1_0, 1_1, or 1_2. Here, CS-RNTI may be used by the base station to schedule the activation / deactivation or retransmission of SPS (semi-persistent) PDSCH or CG (configured grant) PUSCH, and may also be used by the terminal to receive it. Here, MCS-C-RNTI may be used by the base station to schedule PDSCH or PUSCH using an MCS (modulation and coding scheme) with high reliability, and may be used by the terminal to receive it. C-RNTI may be used by the base station to schedule PDSCH or PUSCH, and may be used by the terminal to receive it.

[0275] In addition, the DCI formats that may be further included in the PDCCH monitored by the terminal may further include at least the following.

[0276] DCI format 2_0 includes dynamic SFI (slot format indicator) information indicating whether the symbols of the slot are uplink, downlink, or flexible symbols. The RNTI used for DCI format 2_0 is SFI-RNTI.

[0277] DCI format 2_1 includes a DL preemption indication (or interrupted transmission indication) indicating that there is no downlink transmission from the base station to the terminal in terms of PRB and symbols. The RNTI used for DCI format 2_1 is INT-RNTI.

[0278] DCI format 2_4 includes a UL cancellation indicator for the terminal to indicate uplink transmission cancellation in terms of PRBs and symbols. The RNTI used for DCI format 2_4 is the CI-RNTI.

[0279] Based on the configured control resource set and search space information, the terminal can determine the PDCCH candidates it should receive. The terminal monitors the PDCCH candidates and checks the CRC according to the RNTI value, and then can determine whether it has received the correct PDCCH. The RNTI value may include at least C-RNTI, MCS-C-RNTI, CS-RNTI, as well as SFI-RNTI, INT-RNTI, CI-RNTI values.

[0280] When the terminal receives the correct PDCCH, the terminal can interpret the DCI transmitted by the PDCCH based on the control resource set and search space information and perform the operations indicated by the DCI. The DCI may include one of DCI formats 0_0, 0_1, and 0_2 for scheduling the physical uplink shared channel (PUSCH). The DCI may include one of DCI formats 1_0, 1_1, and 1_2 for scheduling the physical downlink shared channel (PDSCH). The DCI may include one of DCI formats 1_0, 1_1, and 1_2 for scheduling the physical uplink control channel (PUCCH). For reference, the PUCCH may include the PUCCH for transmitting HARQ-ACK. Also, the DCI may include DCI format 2_0, 2_1 or 2_4.

[0281] When the terminal receives DCI format 1_0, 1_1, or 1_2 that schedules the physical downlink shared channel (PDSCH), the terminal must receive the downlink shared channel scheduled by the DCI format. To do so, the terminal must interpret (determine) from the DCI format the slot in which the physical downlink shared channel is scheduled and the start index and length of the symbols within the slot. The TDRA field of the DCI format 1_0, 1_1, or 1_2 can indicate the K0 value, which is the timing information of the scheduled slot, and the SLIV value, which is the index and length of the start symbol within the slot. Here, the value of K0 may be a non-negative integer value. Here, SLIV may be a value obtained by jointly encoding the index (S) and length (L) values of the start symbol within the slot. Also, SLIV may be a value in which the index (S) and length (L) values of the start symbol within the slot are transmitted separately. Here, S may have one value among 0, 1, ···, 13 for normal CP, and L may have one value among natural numbers that satisfy the condition that S + L is less than or equal to 14. S may have one value among 0, 1, ···, 11 for extended CP, and L may have one value among natural numbers that satisfy the condition that S + L is less than or equal to 12.

[0282] Based on the K0 value, the terminal can determine the slot in which the physical downlink shared channel (PDSCH) should be received. More specifically, based on the K0 value, the index of the slot in which the DCI is received, the subcarrier spacing (SCS) of the downlink BWP in which the DCI is received, or the subcarrier spacing of the downlink BWP in which the scheduled downlink shared channel is received, the terminal can determine the slot in which the physical downlink shared channel should be received.

[0283] For example, assume that the subcarrier spacing of the downlink BWP that receives the DCI is the same as that of the downlink BWP that receives the scheduled physical downlink shared channel (PDSCH). Assume that the DCI is received in downlink slot n. In this case, the downlink shared channel (PDSCH) must be received in downlink slot n+K0.

[0284] For example, assume that the subcarrier spacing of the downlink BWP that receives the DCI is 15kHz*2^mu_PDCCH, and the subcarrier spacing of the downlink BWP that receives the scheduled physical downlink shared channel (PDSCH) is 15kHz*2^mu_PDSCH. Assume that the DCI is received in downlink slot n. Here, the index of downlink slot n is the index based on the subcarrier spacing of the downlink BWP that receives the DCI. In this case, the physical downlink shared channel must be received in slot floor(n*2^mu_PDSCH / 2^mu_PDCCH)+K0. Here, the index floor(n*2^mu_PDSCH / 2^mu_PDCCH)+K0 of the downlink slot is the index based on the subcarrier spacing of the downlink BWP that receives the physical downlink shared channel. In the above description, mu_PDCCH or mu_PDSCH may have values of 0, 1, 2, 3.

[0285] Referring to FIG. 25, assume that the terminal receives a PDCCH that schedules a physical downlink shared channel (PDSCH) in downlink slot n. Assume that in the DCI transmitted from the PDCCH, K0=3 is indicated. Also assume that the subcarrier spacing of the DL BWP where the PDCCH is received is the same as the subcarrier spacing of the DL BWP where the PDSCH is scheduled. In this case, the terminal can determine that the PDSCH is scheduled in downlink slot n+K0, that is, slot n+3.

[0286] The terminal can determine the symbol on which to receive the Physical Downlink Shared Channel (PDSCH) in the slot for receiving the PDSCH based on the K0 value, using the index (S) and length (L) values of the starting symbol within the slot. The symbol on which to receive the PDSCH is from symbol S to symbol S + L - 1 within the slot obtained based on the K0 value. For reference, from symbol S to symbol S + L - 1 are L consecutive symbols.

[0287] The terminal may further receive from the base station that downlink slot aggregation is set. The downlink slot aggregation value may be 2, 4, or 8. When downlink slot aggregation is set, the terminal must receive the Physical Downlink Shared Channel (PDSCH) in consecutive slots corresponding to the slot aggregation value starting from the slot obtained based on the K0 value.

[0288] When the terminal receives DCI format 1_0, 1_1, or 1_2 for scheduling the Physical Uplink Control Channel, it must transmit the scheduled uplink control channel. The Physical Uplink Control Channel may include HARQ-ACK information. The PDSCH-to-HARQ_feedback timing indicator field included in the DCI format 1_0, 1_1, or 1_2 can indicate a K1 value that is a value for the information of the slot in which the scheduled uplink control channel is to be transmitted. Here, the value of K1 may be a non-negative integer value. The K1 value of DCI format 1_0 can indicate one of the values {0, 1, 2, 3, 4, 5, 6, 7}. The K1 value that can be indicated by DCI format 1_1 or 1_2 may be configured or set by the upper layer.

[0289] The HARQ-ACK information may be HARQ-ACK information regarding whether reception of two types of channels was successful. As the first type, when a physical downlink shared channel (PDSCH) is scheduled by the DCI format 1_0, 1_1, or 1_2, it may be HARQ-ACK regarding whether reception of the physical downlink shared channel (PDSCH) was successful. As the second type, when the DCI format 1_0, 1_1, or 1_2 is DCI that instructs release of a semi-persistent physical downlink shared channel (SPS PDSCH), it may be HARQ-ACK regarding whether reception of the DCI format 1_0, 1_1, or 1_2 was successful.

[0290] The terminal can determine the slot for transmitting an uplink control channel including the first type of HARQ-ACK information as follows. The terminal can determine the uplink slot overlapping with the last symbol of the physical downlink shared channel (PDSCH) corresponding to the HARQ-ACK information. If the index of the uplink slot is m, the uplink slot for the terminal to transmit the physical uplink control channel including the HARQ-ACK information may be m + K1. Here, the index of the uplink slot is a value based on the subcarrier spacing of the uplink BWP in which the uplink control channel is transmitted.

[0291] For reference, when downlink slot aggregation is set for the terminal, the last symbol represents the last symbol of the PDSCH scheduled within the last slot among the slots in which the physical downlink shared channel (PDSCH) is received.

[0292] Referring to FIG. 26, assume that the terminal receives a Physical Downlink Control Channel (PDCCH) that schedules a Physical Downlink Shared Channel (PDSCH) in a downlink slot n. Assume that the Downlink Control Information (DCI) transmitted from the PDCCH indicates K0 = 3 and K1 = 2. Also assume that the subcarrier spacing of the DL BWP in which the PDCCH is received, the subcarrier spacing of the DL BWP in which the PDSCH is scheduled, and the subcarrier spacing of the UL BWP in which the Physical Uplink Control Channel (PUCCH) is transmitted are the same. In this case, the terminal can determine that the PDSCH is scheduled in downlink slot n + K0, that is, slot n + 3. Also, the terminal determines an uplink slot that overlaps with the last symbol of the PDSCH scheduled in downlink slot n + 3. Here, the last symbol of the PDSCH in downlink slot n + 3 overlaps with uplink slot n + 3. Therefore, the terminal transmits the PUCCH in uplink slot n + 3 + K1, that is, slot n + 5.

[0293] The terminal can determine the slot for transmitting the Physical Uplink Control Channel containing the second type of HARQ-ACK information as follows. The terminal can determine an uplink slot that overlaps with the last symbol of the Physical Downlink Control Channel (PDCCH) corresponding to the HARQ-ACK information. If the index of the uplink slot is m, the slot in which the terminal transmits the uplink control channel containing the HARQ-ACK information may be m + K1. Here, the index of the slot is a value based on the subcarrier spacing of the uplink BWP in which the Physical Uplink Control Channel (PUCCH) is transmitted.

[0294] Referring to FIG. 27, assume that the terminal receives a PDCCH that transmits an SPS PDSCH release DCI in the downlink slot n. Assume that the DCI transmitted from the PDCCH indicates K1 = 3. Also assume that the subcarrier spacing of the DL BWP where the PDCCH is received is the same as the subcarrier spacing of the UL BWP where the PUCCH is transmitted. In this case, the terminal determines the uplink slot that overlaps with the last symbol of the PDCCH in the downlink slot n. In this case, the terminal can determine that a PUCCH that transmits a HARQ-ACK of the SPS PDSCH release DCI is scheduled in the uplink slot n + K1, that is, n + 3.

[0295] When the terminal receives a DCI format 0_0, 0_1, or 0_2 that schedules a physical uplink shared channel, the terminal must transmit the scheduled physical uplink shared channel. For this purpose, the terminal must interpret (determine) from the DCI the slot in which the physical uplink shared channel is scheduled and the start index and length of the symbols in the slot. In the DCI format 0_0, 0_1, or 0_2, the TDRA field can indicate a K2 value that is a value for the information of the scheduled slot and an SLIV that is a value for the information of the start symbol index and length in the slot. Here, the value of K2 may be a non-negative integer value. Here, the SLIV may be a value obtained by jointly encoding the values of the start symbol index (S) and length (L) in the slot. Also, the SLIV may be a value in which the values of the start symbol index (S) and length (L) in the slot are transmitted separately. Here, S may have one value among 0, 1, ···, 13 in the normal CP, and L may have one value among natural numbers that satisfy the condition that S + L is less than or equal to 14. S may have one value among 0, 1, ···, 11 in the extended CP, and L may have one value among natural numbers that satisfy the condition that S + L is less than or equal to 12.

[0296] The terminal can determine the slot in which to transmit the Physical Uplink Shared Channel (PUSCH) based on the K2 value. More specifically, based on the K2 value, the index of the slot in which the DCI is received, the subcarrier spacing of the downlink BWP in which the DCI is received, or the subcarrier spacing of the uplink BWP in which the Physical Uplink Shared Channel (PUSCH) is transmitted, the slot in which to transmit the Physical Uplink Shared Channel (PUSCH) can be determined.

[0297] For example, assume that the subcarrier spacing of the downlink BWP in which the DCI is received is the same as the subcarrier spacing of the uplink BWP in which the scheduled Physical Uplink Shared Channel (PUSCH) is transmitted. Assume that the DCI is received in downlink slot n. In this case, the Physical Uplink Shared Channel (PUSCH) must be transmitted in uplink slot n + K2.

[0298] For example, assume that the subcarrier spacing of the downlink BWP in which the DCI is received is 15 kHz * 2^mu_PDCCH, and the subcarrier spacing of the uplink BWP in which the scheduled Physical Uplink Shared Channel (PUSCH) is received is 15 kHz * 2^mu_PUSCH. Assume that the DCI is received in downlink slot n. Here, the index of downlink slot n is the index according to the subcarrier spacing of the downlink BWP in which the DCI is received. In this case, the Physical Uplink Shared Channel (PUSCH) must be transmitted in slot floor(n * 2^mu_PUSCH / 2^mu_PDCCH) + K2. Here, the index of the uplink slot floor(n * 2^mu_PUSCH / 2^mu_PDCCH) + K2 is the index according to the subcarrier spacing of the uplink BWP in which the Physical Uplink Shared Channel is transmitted. In the above description, mu_PDCCH or mu_PUSCH may have values of 0, 1, 2, 3.

[0299] Referring to FIG. 27, assume that the terminal receives a PDCCH that schedules a Physical Uplink Shared Channel (PUSCH) in downlink slot n. Assume that the DCI transmitted from the PDCCH indicates K2 = 3. Also assume that the subcarrier spacing of the DL BWP where the PDCCH is received is the same as the subcarrier spacing of the UL BWP where the PUCCH is transmitted. In this case, the terminal can determine that the PUSCH is scheduled in uplink slot n + K2 = n + 3.

[0300] The terminal can determine the symbols for transmitting the Physical Uplink Shared Channel (PUSCH) using the index (S) and length (L) values of the start symbol within the slot at the slot for transmitting the Physical Uplink Shared Channel (PUSCH) based on the K2 value. The symbols for transmitting the Physical Uplink Shared Channel (PUSCH) are from symbol S to symbol S + L - 1 within the slot obtained based on the K2 value. For reference, from symbol S to symbol S + L - 1 are L consecutive symbols.

[0301] The terminal may further have an uplink slot aggregation configured by the base station. The uplink slot aggregation value may be 2, 4, or 8. When the uplink slot aggregation is configured, the terminal must transmit the Physical Uplink Shared Channel (PUSCH) in consecutive slots corresponding to the slot aggregation value starting from the slot obtained based on the K2 value.

[0302] In FIGS. 25 to 27, the terminal uses the K0 value, K1 value, and K2 value to determine the slot in which the scheduled Physical Downlink Shared Channel (PDSCH) is received, the slot for transmitting the Physical Uplink Control Channel (PUCCH), and the slot for transmitting the Physical Uplink Shared Channel (PUSCH). For the convenience of the present invention, the slot obtained by assuming the K0 value, K1 value, and K2 value to be 0 is called the reference point or reference slot.

[0303] In FIG. 25, the reference slot to which the K0 value is applied is the downlink slot n in which the PDCCH is received.

[0304] In FIG. 26, the reference slot to which the K1 value is applied is the uplink slot n+3 which is an uplink slot overlapping with the last symbol of the PDSCH.

[0305] In FIG. 27, the reference slot to which the K1 value is applied is the uplink slot n which is an uplink slot overlapping with the last symbol of the PDCCH. Also, the reference slot to which the K2 value is applied is the uplink slot n.

[0306] For the convenience of the present invention, the following description assumes that the subcarrier spacing of the downlink BWP in which the terminal receives the PDSCH and the PDCCH is the same as the subcarrier spacing of the uplink BWP in which the terminal transmits the PUSCH and the PUCCH. In this case, the separate uplink slot and downlink slot are not distinguished and are expressed as slots.

[0307] When the base station has data to be periodically transmitted to the terminal, it can use the semi-persistent scheduling (SPS) method as one method for transmitting it. The specific method is as follows.

[0308] The terminal may receive the setting information for the SPS method from the base station. The setting information may be transmitted by an RRC signal. The setting information may include at least the SPS period. Here, the SPS period may be one of the slot unit or the ms unit.

[0309] The terminal can receive a PDCCH from the base station to activate or deactivate (or release) the SPS mode. The PDCCH may include DCI format 1_0, 1_1, or 1_2. Here, DCI format 1_0, 1_1, or 1_2 may be scrambled with a CS-RNTI. The terminal can determine whether the PDCCH indicates activation or deactivation of the SPS mode. The determination may be made based on the value of the FDRA, RV, MCS, or HPN (HARQ process number) field transmitted by the DCI format.

[0310] When the terminal receives a PDCCH from the base station to activate the SPS mode, the terminal can obtain the following information according to the following fields of the PDCCH.

[0311] - TDRA: From this field, the terminal can obtain the slot where the SPS PDSCH of the SPS mode starts, and information about the start symbol and length within the slot. Here, the slot where the SPS PDSCH of the SPS mode starts is indicated based on the PDCCH that activates the SPS mode, and the start symbol and length within the slot are indicated by the SLIV.

[0312] - PDSCH-to-HARQ_feedback timing indicator: From this field, the terminal can obtain information about the slot for transmitting the HARQ-ACK of the SPS PDSCH of the SPS mode. Here, the slot for transmitting the HARQ-ACK of the PDSCH of the SPS mode can be indicated based on the slot to which the last symbol of the SPS PDSCH belongs.

[0313] The terminal can receive the SPS PDSCH using the information of the PDCCH and transmit a HARQ-ACK indicating whether the reception of the SPS PDSCH was successful. As described above, the terminal obtains information regarding the slot in which the SPS PDSCH of the SPS mode starts, the start symbol, and the length from the TDRA field. The terminal can receive the SPS PDSCH every SPS period. For example, when the terminal is instructed to receive the SPS PDSCH in slot n from the activated PDCCH, the terminal must receive the SPS PDSCH in slot n, slot n+P, slot n+2*P, ···. Also, the terminal must transmit a HARQ-ACK indicating whether the reception of the SPS PDSCH received every period was successful. Here, P includes 1. At this time, the slot in which the HARQ-ACK is transmitted is based on the PDSCH-to-HARQ_feedback timing indicator field. For example, when the PDSCH-to-HARQ_feedback timing indicator indicates a K1 value, the terminal can transmit the HARQ-ACK of the SPS PDSCH received in slot n in slot n+K1 and transmit the HARQ-ACK of the SPS PDSCH received in slot n+P in slot n+P+K1.

[0314] Here, unless otherwise specified, the HARQ-ACK of the SPS PDSCH is assumed to be 1 bit for convenience. When the SPS PDSCH has multiple bits according to the upper layer setting, the present invention may be interpreted accordingly.

[0315] The problem to be solved by the present invention is to determine the PUCCH that transmits the SPS PDSCH or the HARQ-ACK of the SPS PDSCH.

[0316] FIG. 28 is a diagram showing the reception of the SPS PDSCH.

[0317] Referring to FIG. 28, the terminal receives the SPS PDSCH. In FIG. 28, the period of the SPS is given as P_SPS. The terminal must receive the SPS PDSCH every period P_SPS of the SPS. In FIG. 28, the first SPS PDSCH is named SPS1, the second SPS PDSCH is named SPS2, the third SPS PDSCH is named SPS3, the fourth SPS PDSCH is named SPS4, and the fifth SPS PDSCH is named SPS5.

[0318] Referring to FIG. 28, if the cell that receives the SPS PDSCH operates in the TDD (time division duplex) mode, it may be determined whether the terminal can receive the SPS PDSCH according to the direction of the cell.

[0319] More specifically, if the cell operates in the TDD mode, one of a downlink symbol, an uplink symbol, and a flexible symbol may be set as the direction of each symbol of the cell. Here, the downlink symbol is a symbol through which the terminal can receive a downlink signal or channel, the uplink symbol is a symbol through which the terminal can transmit an uplink signal or channel, and the flexible symbol is a symbol whose direction has not yet been determined and can receive / transmit a downlink / uplink signal or channel.

[0320] If all the symbols for receiving the SPS PDSCH are downlink symbols, the terminal receives the SPS PDSCH.

[0321] If at least one of the symbols for receiving the SPS PDSCH overlaps with an uplink symbol, the terminal does not receive the SPS PDSCH.

[0322] If the symbol for receiving SPS PDSCH does not overlap with the uplink symbol but overlaps with at least one flexible symbol, the terminal may or may not receive the SPS PDSCH. Here, whether to receive it is determined by separate signaling, or one of the two operations (receiving or not receiving) may be selected. For example, if the reception of dynamic SFI (slot format information) is configured for the terminal, the SPS PDSCH is not received. If the reception of dynamic SFI (slot format information) is not configured for the terminal, the SPS PDSCH is received.

[0323] In the present invention, for convenience, the operation of the terminal is described using downlink symbols and uplink symbols. However, the flexible symbol may be interpreted as operating as a downlink symbol or an uplink symbol depending on the configuration. For example, when determining the reception of SPS PDSCH, the flexible symbol may be interpreted in the same way as the uplink symbol.

[0324] Referring to FIG. 28, SPS1, SPS2, SPS3, and SPS4 overlap with the downlink symbols. Therefore, the terminal receives SPS1, SPS2, SPS3, and SPS4. However, since SPS5 overlaps with the uplink symbol, the terminal cannot receive SPS5. Also, the terminal does not need to receive SPS5 and does not need to transmit the HARQ-ACK therefor.

[0325] FIG. 29 is a diagram showing the HARQ-ACK transmission of SPS PDSCH.

[0326] Referring to FIG. 29, the transmission of the PUCCH for transmitting the HARQ-ACK of the SPS PDSCH of the terminal is shown. In FIG. 29, the PDSCH-to-HARQ_feedback timing indicator assumes K1. The terminal receives the SPS PDSCH every period P_SPS of the SPS, and the PUCCH for transmitting the HARQ-ACK of the SPS PDSCH must be transmitted K1 slots after the slot in which the SPS PDSCH is received. In FIG. 29, let the HARQ-ACK information of SPS1 be b1, the HARQ-ACK information of SPS2 be b2, the HARQ-ACK information of SPS3 be b3, and the HARQ-ACK information of SPS4 be b4. In FIG. 29, the PUCCH for transmitting the HARQ-ACK information (b1) of SPS1 is PUCCH for SPS1, the PUCCH for transmitting the HARQ-ACK information (b2) of SPS2 is PUCCH for SPS2, the PUCCH for transmitting the HARQ-ACK information (b3) of SPS3 is PUCCH for SPS3, and the PUCCH for transmitting the HARQ-ACK information (b4) of SPS4 is PUCCH for SPS4.

[0327] If all the symbols for transmitting the PUCCH of the SPS PDSCH are uplink symbols, the terminal transmits the PUCCH of the SPS PDSCH.

[0328] If at least one of the symbols for transmitting the PUCCH of the SPS PDSCH overlaps with a downlink symbol, the terminal does not transmit the PUCCH of the SPS PDSCH.

[0329] If the symbol for transmitting the PUCCH of the SPS PDSCH does not overlap with the downlink symbol but overlaps with at least one flexible symbol, the terminal may or may not transmit the PUCCH of the SPS PDSCH. Here, whether to transmit or not may be determined by another signaling, or one of the two operations (transmitting or not transmitting) may be selected. For example, if the reception of dynamic SFI (slot format information) is set for the terminal, the PUCCH of the SPS PDSCH is not transmitted. If the reception of dynamic SFI (slot format information) is not set for the terminal, the PUCCH of the SPS PDSCH is transmitted.

[0330] In the present invention, for convenience, the operation of the terminal is described using downlink symbols and uplink symbols. However, the flexible symbol may be interpreted as operating as a downlink symbol or an uplink symbol depending on the setting. For example, when determining the transmission of the PUCCH for transmitting the HARQ-ACK of the SPS PDSCH, the flexible symbol may be interpreted in the same way as the downlink symbol.

[0331] Referring to FIG. 29, PUCCH for SPS1, PUCCH for SPS2, and PUCCH for SPS3 overlap with the downlink symbol. Therefore, the terminal cannot transmit PUCCH for SPS1, PUCCH for SPS2, and PUCCH for SPS3. However, since PUCCH for SPS4 overlaps with the uplink symbol, the terminal can transmit PUCCH for SPS4. Therefore, in FIG. 29, the terminal cannot transmit the HARQ-ACK information of SPS1, SPS2, and SPS3 to the base station, but can transmit the HARQ-ACK information of SPS4 to the base station.

[0332] In the above description, when one cell operates in TDD, the reception of the SPS PDSCH of the terminal and the transmission of the PUCCH for transmitting the HARQ-ACK of the SPS PDSCH were described. This may be extended when a plurality of cells are configured for one terminal. Specifically, the operation of the terminal in a plurality of cells is as follows.

[0333] If the terminal supports half-duplex operation and does not support full-duplex operation, when a certain cell is a downlink symbol, or the reception of a downlink signal or channel is indicated or configured, the symbol may be regarded as a downlink symbol in other cells. That is, the terminal does not transmit an uplink signal or channel to the symbol in other cells. If the terminal supports half-duplex operation and does not support full-duplex operation, when a certain cell is an uplink symbol, or the transmission of an uplink signal or channel is indicated or configured, the symbol may be regarded as an uplink symbol in other cells. That is, the terminal does not receive a downlink signal or channel to the symbol in other cells.

[0334] This embodiment discloses a method for the terminal to transmit the HARQ-ACK that could not be transmitted to the base station.

[0335] FIG. 30 is a diagram showing a PUCCH for transmitting the HARQ-ACK of the SPS PDSCH according to an embodiment.

[0336] Referring to FIG. 30, when the terminal cannot transmit a PUCCH including the HARQ-ACK of the SPS PDSCH, the terminal can transmit it on a PUCCH capable of transmitting the HARQ-ACK. In FIG. 30, the PUCCH capable of transmission is explicitly indicated as PUCCH for SPS. Referring to FIG. 30, the terminal can perform the following steps.

[0337] As a first step, the terminal can determine the SPS PDSCHs that are receivable and those that are not. The determination can be made based on the symbol direction. The terminal can determine that the HARQ-ACK information for the receivable SPS PDSCHs is the HARQ-ACK information to be transmitted to the base station, and the HARQ-ACK information for the non-receivable SPS PDSCHs may be excluded from the HARQ-ACK information to be transmitted to the base station. The exclusion method may be not to transmit the HARQ-ACK information or to include NACK as the HARQ-ACK information.

[0338] As a second step, the terminal can select a PUCCH for transmitting the HARQ-ACK information to be transmitted to the base station. If a PUCCH for transmitting the HARQ-ACK information of the SPS PDSCH can be transmitted according to the value of the PDSCH-to-HARQ_feedback timing indicator field, the terminal can transmit the HARQ-ACK information of the SPS PDSCH included in the PUCCH. If a PUCCH for transmitting the HARQ-ACK information of the SPS PDSCH cannot be transmitted according to the value of the PDSCH-to-HARQ_feedback timing indicator field, the terminal can transmit the HARQ-ACK information of the SPS PDSCH included in the PUCCH for SPS. Here, the PUCCH for SPS is not the PUCCH for transmitting the HARQ-ACK information of the SPS PDSCH according to the value of the PDSCH-to-HARQ_feedback timing indicator field.

[0339] As a third step, the terminal must determine the PUCCH for SPS. A more specific example of the third step is as follows.

[0340] As a first embodiment of the present invention, the terminal can determine the PUCCH for SPS as follows. If the PUCCH for transmitting the HARQ-ACK of the first SPS PDSCH is not transmittable, the terminal can check whether the PUCCH for transmitting the HARQ-ACK of the next second SPS PDSCH is transmittable. If the PUCCH for transmitting the HARQ-ACK of the second SPS PDSCH is transmittable, the terminal can transmit the HARQ-ACK of the first SPS PDSCH and the HARQ-ACK of the second SPS PDSCH to the transmittable PUCCH. If the PUCCH for transmitting the HARQ-ACK of the second SPS PDSCH is also not transmittable, the terminal can check whether the PUCCH for transmitting the HARQ-ACK of the next third SPS PDSCH is transmittable. In this way, if the PUCCH for transmitting the HARQ-ACK of the first SPS PDSCH is not transmittable, the terminal checks whether the PUCCH of the SPS PDSCH is transmittable among the SPS PDSCHs after the first SPS PDSCH, and transmits the HARQ-ACK of the first SPS PDSCH using the transmittable PUCCH of the SPS PDSCH.

[0341] FIG. 31 is a diagram showing a PUCCH for transmitting the HARQ-ACK of an SPS PDSCH according to another embodiment.

[0342] Figure 31 shows the first embodiment of the present invention. The PUCCH (PUCCH for SPS1) for transmitting the HARQ-ACK (b1) of SPS1 is not transmittable. In order to transmit this HARQ-ACK (b1), the terminal has to select another PUCCH. First, it can be determined whether the PUCCH (PUCCH for SPS2) for transmitting the HARQ-ACK (b2) of SPS2, which is the next SPS PDSCH of SPS1, is transmittable. Here, the PUCCH (PUCCH for SPS2) for transmitting the HARQ-ACK (b2) of SPS2 is not transmittable. Next, it can be determined whether the PUCCH (PUCCH for SPS3) for transmitting the HARQ-ACK (b3) of SPS3, which is the next SPS PDSCH of SPS2, is transmittable. Here, the PUCCH (PUCCH for SPS3) for transmitting the HARQ-ACK (b3) of SPS3 is not transmittable. Next, it can be determined whether the PUCCH (PUCCH for SPS4) for transmitting the HARQ-ACK (b4) of SPS4, which is the next SPS PDSCH of SPS3, is transmittable. Here, the PUCCH (PUCCH for SPS4) for transmitting the HARQ-ACK (b4) of SPS4 is transmittable. Therefore, the terminal can transmit the HARQ-ACK (b1) of SPS1 using the PUCCH for SPS4 that transmits the HARQ-ACK (b4) of SPS4.

[0343] Similarly, the HARQ-ACK (b2) of SPS2 and the HARQ-ACK (b3) of SPS3 can also be transmitted using the PUCCH for SPS4 that transmits the HARQ-ACK (b4) of SPS4.

[0344] Therefore, referring to Figure 31, the PUCCH for SPS4 may include not only the HARQ-ACK (b4) of SPS4, but also the HARQ-ACK (b1) of SPS1, the HARQ-ACK (b2) of SPS2, and the HARQ-ACK (b3) of SPS3. That is, the PUCCH for SPS4 may include [b1 b2 b3 b4] (where the order of b1 b2 b3 b4 is arranged in the order of slots, but it may be arranged in other orders).

[0345] If multiple SPS configurations are provided to one terminal, the first embodiment may be applied as follows.

[0346] One terminal may be provided with multiple SPS configurations in one cell. Each SPS configuration may have each SPS period. The terminal can receive each PDCCH that activates each SPS configuration. Each PDCCH can indicate the value of each PDSCH-to-HARQ_feedback timing indicator field.

[0347] Figs. 32 to 34 are diagrams showing PUCCHs that transmit HARQ-ACKs of SPS PDSCHs in multiple SPS configurations according to still other embodiments.

[0348] Referring to Figs. 32 to 34, two SPS configurations may be provided in one cell. SPS1-1, SPS1-2, SPS1-3, SPS1-4 represent SPS PDSCHs according to the first SPS configuration, b1-1, b1-2, b1-3, b1-4 represent HARQ-ACKs of SPS1-1, SPS1-2, SPS1-3, SPS1-4, and PUCCH for SPS1-1, PUCCH for SPS1-2, PUCCH for SPS1-3, PUCCH for SPS1-4 represent PUCCHs that transmit HARQ-ACKs of SPS1-1, SPS1-2, SPS1-3, SPS1-4. Here, the value of the PDSCH-to-HARQ_feedback timing indicator field according to the first SPS configuration is K1-1. SPS2-1, SPS2-2 represent SPS PDSCHs according to the second SPS configuration, b2-1, b2-2 represent HARQ-ACKs of SPS2-1, SPS2-2, and PUCCH for SPS2-1, PUCCH for SPS2-2 represent PUCCHs that transmit HARQ-ACKs of SPS2-1, SPS2-2.

[0349] The first SPS configuration is set with a shorter SPS period compared to the second SPS configuration.

[0350] The PUCCH for SPS1-1, PUCCH for SPS1-2, and PUCCH for SPS1-3 that transmit the HARQ-ACK (b1-1) of SPS1-1, the HARQ-ACK (b1-2) of SPS1-2, and the HARQ-ACK (b1-3) of SPS1-3 according to the first SPS setting cannot be transmitted. Also, the PUCCH for SPS2-1 that transmits the HARQ-ACK (b2-1) of SPS2-1 according to the second SPS setting cannot be transmitted.

[0351] Example 1-1 of the present invention is as shown in FIG. 32.

[0352] Referring to FIG. 32, the terminal can apply Example 1 to the SPS PDSCH having the same SPS setting. That is, the HARQ-ACK of the SPS PDSCH according to one SPS setting can be transmitted on the PUCCH that transmits the HARQ-ACK of other SPS PDSCHs according to that SPS setting. However, the HARQ-ACK of the SPS PDSCH according to one SPS setting cannot be transmitted on the PUCCH that transmits the HARQ-ACK of the SPS PDSCH according to another SPS setting.

[0353] The HARQ-ACK (b1-1) of SPS1-1, the HARQ-ACK (b1-2) of SPS1-2, and the HARQ-ACK (b1-3) of SPS1-3 in the first setting may be included in the PUCCH for SPS1-4 that transmits the HARQ-ACK (b1-4) of SPS1-4 in the first setting. Therefore, the PUCCH for SPS1-4 may include [b1-1, b1-2, b1-3, b1-4].

[0354] The HARQ-ACK (b2-1) of SPS2-1 in the second setting may be included in the PUCCH for SPS2-2 that transmits the HARQ-ACK (b2-2) of SPS2-2 in the second setting. Therefore, the PUCCH for SPS2-2 may include [b2-1, b2-2].

[0355] Example 1-2 of the present invention is as shown in FIG. 33.

[0356] Referring to FIG. 33, the terminal can apply the first embodiment to the SPS PDSCH of all SPS settings. That is, the HARQ-ACK of the SPS PDSCH according to one SPS setting can be transmitted on the PUCCH that transmits the HARQ-ACK of the SPS PDSCH according to the same or another SPS setting.

[0357] The HARQ-ACKs (b1-1), (b1-2), and (b1-3) of SPS1-1, SPS1-2, and SPS1-3 in the first setting cannot be transmitted, and a transmit-capable PUCCH must be searched for. At this time, regardless of the SPS setting, a transmit-capable PUCCH can be searched for. For example, the HARQ-ACK (b1-1) of SPS1-1 may be included in the earliest PUCCH for SPS2-2 in terms of time among PUCCH for SPS1-4 and PUCCH for SPS2-2, which are transmit-capable PUCCHs. As a result, PUCCH for SPS1-4 includes the HARQ-ACK (b1-4) of SPS1-4 in the first setting, and PUCCH for SPS2-2 may include the HARQ-ACKs (b1-1), (b1-2), and (b1-3) of SPS1-1, SPS1-2, and SPS1-3 in the first setting and the HARQ-ACKs (b2-1) and (b2-2) of SPS2-1 and SPS2-2 in the second setting.

[0358] Embodiments 1-3 of the present invention are as shown in FIG. 34.

[0359] Referring to FIG. 34, when applying the first embodiment, the terminal can apply it only to the SPS PDSCH of a specific SPS setting. That is, the HARQ-ACK of the SPS PDSCH according to one SPS setting can be transmitted on the PUCCH that transmits the HARQ-ACK of the SPS PDSCH according to the specific SPS setting.

[0360] Here, preferably, the specific SPS setting may be the SPS setting having the lowest ID among the SPS settings set in the terminal.

[0361] Here, preferably, the specific SPS setting may be the SPS setting with the shortest SPS period among the SPS settings set in the terminal.

[0362] The specific SPS setting is the first setting. That is, the HARQ-ACK of the SPS PDSCH of the first setting and the second setting can be transmitted on the PUCCH that transmits the HARQ-ACK of the SPS PDSCH of the first setting. However, the HARQ-ACK of the SPS PDSCH of the first setting and the second setting cannot be transmitted on the PUCCH that transmits the HARQ-ACK of the SPS PDSCH of the second setting.

[0363] The HARQ-ACK (b1-1) of SPS1-1, the HARQ-ACK (b1-2) of SPS1-2, and the HARQ-ACK (b1-3) of SPS1-3 of the first setting cannot be transmitted, and a transmitable PUCCH must be searched for. At this time, the transmitable PUCCH of the first SPS setting, which is the specific SPS setting, can be searched for. For example, the HARQ-ACK (b1-1) of SPS1-1 may be included in the PUCCH for SPS1-4 of the first SPS setting, which is the specific SPS setting, among the PUCCH for SPS1-4 and the PUCCH for SPS2-2 that are transmitable PUCCHs.

[0364] The HARQ-ACK (b2-1) of SPS2-1 of the second setting cannot be transmitted, and a transmitable PUCCH must be searched for. At this time, the transmitable PUCCH of the first SPS setting, which is the specific SPS setting, can be searched for. For example, the HARQ-ACK (b2-1) of SPS2-1 may be included in the PUCCH for SPS1-4 of the first SPS setting, which is the specific SPS setting, among the PUCCH for SPS1-4 and the PUCCH for SPS2-2 that are transmitable PUCCHs.

[0365] As a result, PUCCH for SPS1-4 may include [b1-1, b1-2, b1-3, b1-4, b2-1]. And PUCCH for 2-2 may include [b2-2].

[0366] A priority may be set for the SPS configuration.

[0367] If a priority is set for the SPS configuration, the transmitable PUCCH may be limited to the SPS configurations having the same priority. That is, if a priority is set for the SPS configuration, the HARQ-ACK of the SPS configuration having one priority may be included in the PUCCH that transmits the HARQ-ACK of the SPS configuration having that priority.

[0368] For example, in the descriptions of the above Examples 1-1, 1-2, and 1-3, the SPS configurations may have the same priority.

[0369] For example, referring to FIG. 32, when the first configuration and the second configuration have different priorities from each other, the HARQ-ACK of the SPS of the first configuration may be included in the transmitable PUCCH (PUCCH for SPS1-4) of the SPS configuration having the same priority as the first configuration. Also, the HARQ-ACK of the SPS of the second configuration may be included in the transmitable PUCCH (PUCCH for SPS2-2) of the SPS configuration having the same priority as the second configuration.

[0370] If a priority is set for the SPS configuration, the HARQ-ACK of the SPS configuration having one priority may be included in the PUCCH that transmits the HARQ-ACK of the SPS configuration having that priority or a lower priority than that priority.

[0371] For example, referring to FIG. 34, assume that the priority of the first configuration is lower than the priority of the second configuration. In this case, the HARQ-ACK of the SPS of the first configuration may be included in the transmitable PUCCH (PUCCH for SPS1-4) of the SPS configuration having the same or lower priority as the first configuration. Also, the HARQ-ACK of the SPS of the second configuration may be included in the transmitable PUCCH (PUCCH for SPS1-4) of the SPS configuration having the same or lower priority as the second configuration.

[0372] In the above-described first embodiment and its derivatives, namely, the first to third embodiments, the terminal transmitted including HARQ-ACKs that could not be transmitted on the PUCCH for transmitting HARQ-ACKs of the SPS PDSCH. However, in this case, the terminal may inadvertently transmit HARQ-ACKs of the SPS PDSCH together with HARQ-ACKs of other SPS PDSCHs. A method for solving this problem is disclosed in the second embodiment.

[0373] According to the second embodiment of the present invention, the base station can configure PUCCH resources for the terminal. Here, the configuration may be performed by an RRC signal or an SPS-activated PDCCH, and the configuration may include at least the following information.

[0374] - The period of the PUCCH resource (P_PUCCH). Similar to the SPS PDSCH having a period, the period of the PUCCH resource may be configured.

[0375] - The offset of the PUCCH resource (O_PUCCH). It can indicate the slot where the PUCCH resource starts. For example, when the offset value is given as O_PUCCH, the PUCCH resource starts from slot O_PUCCH. Depending on the period P_PUCCH, the PUCCH resource may exist in slot O_PUCCH, slot O_PUCCH + P_PUCCH, slot O_PUCCH + 2*P_PUCCH, slot O_PUCCH + 3*P_PUCCH, and so on. Here, O_PUCCH may be indicated by the PDSCH-to-HARQ_feedback timing indicator field of the SPS-activated PDCCH.

[0376] - The index of the PUCCH resource. The PUCCH resource may be configured by an index within a slot. The terminal can determine the PUCCH resource corresponding to the index.

[0377] The terminal can transmit the HARQ-ACK of the SPS PDSCH by including it in the configured PUCCH resource, as shown in FIG. 35.

[0378] FIG. 35 is a diagram showing a PUCCH for transmitting HARQ-ACK of SPS PDSCH using PUCCH resource settings according to still another embodiment.

[0379] Referring to FIG. 35, SPS1, SPS2, ···, SPS8 are indicated by an SPS setting (SPS period (P_SPS)). And PUCCH A for SPS and PUCCH B for SPS are indicated by a setting of PUCCH resources (period of PUCCH resources (P_PUCCH)).

[0380] According to the second embodiment of the present invention, the terminal can transmit the HARQ-ACK of the SPS PDSCH on the set PUCCH resource. More specifically, the HARQ-ACK of the SPS PDSCH can select the nearest (earliest) PUCCH resource among the set PUCCH resources starting after the last symbol of the SPS PDSCH reception.

[0381] Referring to FIG. 35, the HARQ-ACK of SPS1 may be included in the nearest PUCCH resource after SPS1. Here, there are PUCCH A for SPS and PUCCH B for SPS as PUCCH resources after SPS1, and among them, the HARQ-ACK of SPS1 may be included in the nearest PUCCH A for SPS. For example, the HARQ-ACK of SPS5 may be included in the nearest PUCCH resource after SPS5. Here, the HARQ-ACK of SPS5 may be included in PUCCH B for SPS as a PUCCH resource after SPS5.

[0382] In the above second embodiment, the terminal included the HARQ-ACK of the SPS PDSCH in the closest PUCCH resource after receiving the SPS PDSCH. However, the terminal requires a processing time for receiving the SPS PDSCH, which can be referred to as the PDSCH processing time. That is, the terminal requires the PDSCH processing time as the time for receiving the SPS PDSCH and generating the HARQ-ACK indicating whether the reception of the SPS PDSCH was successful. Therefore, including the HARQ-ACK in the closest PUCCH after receiving the SPS PDSCH, as in the second embodiment, may conflict with the PDSCH processing time.

[0383] As a second-1 embodiment of the present invention, the terminal can transmit the HARQ-ACK of the SPS PDSCH on the set PUCCH resource. At this time, the PUCCH resource can be selected in consideration of the PDSCH processing time of the SPS PDSCH. More specifically, for the HARQ-ACK of the SPS PDSCH, the closest (earliest) PUCCH resource among the set PUCCH resources starting from the last symbol of the SPS PDSCH reception after the PDSCH processing time can be selected.

[0384] FIG. 36 is a diagram showing a PUCCH for transmitting the HARQ-ACK of the SPS PDSCH using the PUCCH resource setting according to still another embodiment.

[0385] Referring to FIG. 36, for the HARQ-ACK of SPS4, there are PUCCH A for SPS and PUCCH B for SPS as the closest PUCCH resources after the said SPS4. However, the time between PUCCH A for SPS and SPS4 does not meet the PDSCH processing time. Therefore, the HARQ-ACK of SPS4 cannot be transmitted on PUCCH A for SPS. Since the time between PUCCH B for SPS and SPS4 meets the PDSCH processing time, the HARQ-ACK of SPS4 may be transmitted on PUCCH B for SPS.

[0386] Here, for the PDSCH processing time, the value defined in "5.3 UE PDSCH processing procedure time" of TS38.214 can be used.

[0387] The following embodiments relate to a method for a terminal to transmit the HARQ-ACK of an SPS PDSCH and the HARQ-ACK of an SPS release DCI when the terminal receives an SPS release DCI.

[0388] FIG. 37 is a diagram showing a PUCCH for transmitting the HARQ-ACK of an SPS PDSCH when a terminal according to an embodiment receives an SPS release DCI.

[0389] Referring to FIG. 37, the terminal may receive an SPS release DCI between SPS2 and SPS3. As a result, the terminal does not receive the SPS PDSCH (SPS3, SPS4) after the SPS release DCI. In this case, the terminal must determine how to transmit the HARQ-ACK of the SPS PDSCH.

[0390] As a fourth embodiment of the present invention, the operation when the terminal receives the SPS release DCI is as follows. The terminal can determine a PUCCH for transmitting the HARQ-ACK of the SPS PDSCH regardless of whether the SPS release DCI is received. That is, referring to FIG. 23, regardless of whether the SPS release DCI is received, PUCCH for SPS4, which is a transmit-capable PUCCH, can be selected to transmit the HARQ-ACK (b1) of SPS1, the HARQ-ACK (b2) of SPS2, and the HARQ-ACK (b3) of SPS3. In other words, when the SPS release DCI is not received, the HARQ-ACK (b1) of SPS1, the HARQ-ACK (b2) of SPS2, the HARQ-ACK (b3) of SPS3, and the HARQ-ACK (b4) of SPS4 may be included in the PUCCH for SPS4. Similarly, when the SPS release DCI is received, the HARQ-ACK (b1) of SPS1, the HARQ-ACK (b2) of SPS2, the HARQ-ACK (b3) of SPS3, and the HARQ-ACK (b4) of SPS4 may also be included in the PUCCH for SPS4. Therefore, [b1 b2 b3 b4] can be transmitted on the PUCCH for SPS4 regardless of whether the SPS release DCI is received.

[0391] In the fourth embodiment, since the HARQ-ACK of the SPS is transmitted regardless of whether the SPS release DCI is received, it has a characteristic that is robust against the DTX (reception failure) of the SPS release DCI. However, referring to FIG. 23, since SPS3 and SPS4 are already released SPS PDSCHs, the HARQ-ACKs of SPS3 and SPS4 are NACKs, and this information does not need to be transmitted to the base station. Therefore, in the fourth embodiment, the HARQ-ACK information to be transmitted may be limited to the SPS PDSCH before the reception of the SPS release DCI. That is, referring to FIG. 37, on the PUCCH for SPS4, the HARQ-ACK (b1) of SPS1 and the HARQ-ACK (b2) of SPS2, which are the SPSs before the reception of the SPS release DCI, can be transmitted, and the HARQ-ACK (b3) of SPS3 and the HARQ-ACK (b4) of SPS4, which are the SPSs after the reception of the SPS release DCI, do not need to be transmitted.

[0392] In the fourth embodiment, a PUCCH that transmits the HARQ-ACK of the already released SPS is used. Referring to FIG. 37, SPS4 corresponding to PUCCH for SPS4 where the HARQ-ACK is transmitted has already been released. Therefore, the PUCCH for SPS4 is also released accordingly and cannot be used. Hereinafter, an embodiment for solving this problem will be disclosed.

[0393] In the fifth embodiment of the present invention, the operation when the terminal receives the SPS release DCI is as follows. The terminal can determine that the PUCCH that transmits the HARQ-ACK of the SPS release DCI is the same as the PUCCH that transmits the HARQ-ACK of the SPS PDSCH. A more specific example is as shown in FIG. 38.

[0394] FIG. 38 is a diagram showing a PUCCH that transmits the HARQ-ACK of the SPS PDSCH when the terminal receives the SPS release DCI according to another embodiment.

[0395] Referring to FIG. 38, when the terminal determines the PUCCH that transmits the HARQ-ACK of SPS1 (b1) and the HARQ-ACK of SPS2 (b2), it can select the PUCCH (PUCCH for SPS release DCI) that transmits the HARQ-ACK of the SPS release DCI. Therefore, the PUCCH for SPS release DCI may include the HARQ-ACK of the SPS release DCI, the HARQ-ACK of SPS1 (b1), and the HARQ-ACK of SPS2 (b2).

[0396] FIG. 39 is a diagram showing a PUCCH that transmits the HARQ-ACK of the SPS PDSCH when the terminal receives the SPS release DCI according to still another embodiment.

[0397] Referring to FIG. 39, the fifth embodiment is applied because when the terminal receives the SPS release DCI, SPS4 corresponding to PUCCH for SPS4 that transmits the HARQ-ACK (b1) of SPS1 and the HARQ-ACK (b2) of SPS2 is released. If SPS4 corresponding to PUCCH for SPS4 is not released (for example, the SPS release DCI is received after SPS4), the terminal can transmit the HARQ-ACK (b1) of SPS1, the HARQ-ACK (b2) of SPS2, the HARQ-ACK (b3) of SPS3, and the HARQ-ACK (b4) of SPS4 on PUCCH for SPS4.

[0398] FIG. 40 is a diagram showing a PUCCH for transmitting the HARQ-ACK of the SPS PDSCH when a terminal according to still another embodiment receives the SPS release DCI.

[0399] Referring to FIG. 40, the terminal can include the HARQ-ACK that could not be transmitted in the PUCCH for SPS release DCI that always transmits the HARQ-ACK of the SPS release DCI. This is because even if SPS4 corresponding to PUCCH for SPS4 is not released (for example, the SPS release DCI is received after SPS4), the terminal can transmit the HARQ-ACK (b1) of SPS1, the HARQ-ACK (b2) of SPS2, and the HARQ-ACK (b3) of SPS3 on the PUCCH for SPS release DCI.

[0400] Another problem to be solved in this embodiment is to align the order of the HARQ-ACK bits. As described above, when the PUCCH for transmitting the HARQ-ACK of the SPS PDSCH cannot be transmitted, the HARQ-ACK may be transmitted on another PUCCH. At this time, the order of the HARQ-ACK bits must be determined on the other PUCCH.

[0401] As a preferred method for determining HARQ-ACK bits, the terminal can place the HARQ-ACK bits that should originally be transmitted on the PUCCH in front, and then place the extended HARQ-ACK bits. Here, when the PUCCH that transmits the HARQ-ACK of the SPS PDSCH cannot be transmitted, the HARQ-ACK that is transferred to and transmitted on the PUCCH is called the extended HARQ-ACK bits. The order of the extended HARQ-ACK bits may be determined based on at least the following.

[0402] On one aspect, the order of the extended HARQ-ACK bits may be determined by the ascending order of the index of the slot of the PUCCH on which the extended HARQ-ACK is to be transmitted.

[0403] On another aspect, the order of the extended HARQ-ACK bits may be determined by the ascending order of the index of the slot of the SPS PDSCH corresponding to the extended HARQ-ACK.

[0404] On still another aspect, the order of the extended HARQ-ACK bits may be determined by the ascending order of the HPN (HARQ process number) of the SPS PDSCH corresponding to the extended HARQ-ACK.

[0405] On still another aspect, the order of the extended HARQ-ACK bits may be determined by the ascending order of the index of the cell of the SPS PDSCH corresponding to the extended HARQ-ACK.

[0406] The above criteria may be used in combination. Also, although it is determined by the ascending order of the index of the cell of the SPS PDSCH corresponding to the extended HARQ-ACK, other criteria may be further applied in the same cell.

[0407] The SPS HARQ-ACK transmission of the present invention described above can be summarized step by step as follows.

[0408] Step 1) When the PUCCH resource for SPS HARQ-ACK overlaps with an invalid UL symbol in (sub-)slot n, the terminal drops this PUCCH resource.

[0409] Here, the PUCCH resource for SPS HARQ-ACK is the PUCCH resource configured by the upper layer signal n1PUCCH-AN in SPS-config or SPS-PUCCH-AN-r16 in sps-PUCCH-AN-List-r16. n1PUCCH-AN in SPS-config indicates the PUCCH resource for transmitting the 1-bit HARQ-ACK of SPS. Here, the PUCCH format is format 0 or 1. SPS-PUCCH-AN-r16 in sps-PUCCH-AN-List-r16 indicates up to 4 PUCCH resources. Here, one of the up to 4 PUCCH resources is selected according to the SPS HARQ-ACK bit size.

[0410] Here, the invalid UL symbol may include at least one of semi-static DL, SSB, CORESET#0, all high-priority uplink channels, and the PRACH channel.

[0411] Step 2-1) When the PUCCH resource for DG HARQ-ACK is scheduled in (sub-)slot n, the terminal multiplexes the SPS HARQ-ACK to be transmitted in slot n with the DG HARQ-ACK and transmits it on that PUCCH resource for DG HARQ-ACK.

[0412] Here, the PUCCH resource for DG (dynamic grant) HARQ-ACK is the PUCCH resource indicated for transmitting the HARQ-ACK of the PDSCH scheduled by DCI format 1_0, 1_1, or 1_2. This may be indicated by the PUCCH resource indicator (PRI) field included in DCI format 1_0, 1_1, or 1_2.

[0413] Here, multiplexing can concatenate the DG HARQ-ACK bits and the SPS HARQ-ACK bits to be transmitted in slot n to create a (cascade) bit sequence. This can be applied when it is a type-1 codebook or a type-2 codebook. When it is a type-3 codebook, the DG HARQ-ACK bits and the SPS HARQ-ACK bits are not concatenated and transmitted. In this case, according to the type-3 codebook generation method, the HARQ-ACK bits are aligned and generated in ascending order of the HARQ process number for one cell index in ascending order of the cell index.

[0414] Step2-2) If the PUCCH resource for DG HARQ-ACK is not scheduled in (sub)slot n and other configured PUCCH resources are valid, the terminal shall transmit SPS HARQ-ACK on the valid configured PUCCH resource instead.

[0415] Here, the other configured PUCCH resources may include the PUCCH resources configured for SPS HARQ-ACK transmission or the PUCCH resources configured for DG HARQ-ACK transmission. The PUCCH resources configured for SPS HARQ-ACK transmission may include the PUCCH resources configured by the upper layer signal n1PUCCH-AN in SPS-config or SPS-PUCCH-AN-r16 in sps-PUCCH-AN-List-r16. The PUCCH resources configured for DG HARQ-ACK transmission may include the PUCCH resources that can be indicated by the PUCCH resource indicator (PRI) fields of DCI formats 1-0, 1-1, or 1-2.

[0416] Here, when the other configured PUCCH resources do not overlap with the invalid UL symbols, the terminal can determine that the PUCCH resources are valid.

[0417] Here, if there are multiple PUCCH resources that are effectively configured, the terminal must determine one of the PUCCH resources. The specific method will be described later.

[0418] Step2-3) If the PUCCH resource for DG HARQ-ACK is not scheduled in (sub)slot n and none of the other configured PUCCH resources are valid, the terminal determines whether SPS HARQ-ACK transmission is possible in (sub)slot n+P.

[0419] Here, P may be the period of the SPS PDSCH or a specific value. Preferably, P = 1 may be given.

[0420] Here, to determine whether SPS HARQ-ACK transmission is possible in slot n+P, the above steps 1), 2-1), 2-2), and 2-3) can be used.

[0421] If there are multiple effectively configured PUCCH resources in the above step 2-2), the terminal must determine one of the PUCCH resources. The specific method is as follows.

[0422] First method: When there are multiple effectively configured PUCCH resources, the terminal can select a PUCCH resource based on the bit size that the PUCCH resource can transmit. More specifically, when the number of bits to be transmitted is B bits, among the effectively configured PUCCH resources, select a PUCCH resource that can transmit B bits or more. If there are multiple PUCCH resources that can transmit B bits or more, select the PUCCH resource that can transmit the smallest number of bits among them. More specifically, it is as follows.

[0423] In SPS-PUCCH-AN-r16, up to 4 PUCCH resources can be configured in the sps-PUCCH-AN-List-r16. For PUCCH resources configured for DG HARQ-ACK transmission, up to 4 PUCCH resources can be configured for one PRI value. More specifically, when the HARQ-ACK bit is B bits, if 0 < B ≤ N1, the HARQ-ACK bit is transmitted on PUCCH(~N1 bits); if N1 < B ≤ N2, the HARQ-ACK bit is transmitted on PUCCH(~N2 bits); if N2 < B ≤ N3, the HARQ-ACK bit is transmitted on PUCCH(~N3 bits); if N3 < B ≤ N4, the HARQ-ACK bit can be transmitted on PUCCH(~N4 bits).

[0424] Figure 41 is a diagram showing a method by which a terminal determines valid PUCCH resources according to an example.

[0425] Referring to Figure 41, assume that the HARQ-ACK bit to be transmitted is B bits and N1 < B ≤ N2. In this case, the terminal must transmit the B bits on PUCCH(~N2 bits). However, as shown in Figure 41, when PUCCH(~N2 bits) overlaps with an invalid UL symbol, the terminal does not transmit on PUCCH(~N2 bits) according to step 1). Then, the terminal can transmit the B bits on other configured PUCCH resources according to step 2-2).

[0426] Referring to Figure 41(a), PUCCH(~N1 bits) overlaps with an invalid UL symbol and is thus invalid. PUCCH(~N3 bits) does not overlap with an invalid UL symbol and is thus valid. The terminal can check whether it can transmit the B bits on PUCCH(~N3 bits). Since N3 is greater than B (B is less than N2 and N3 is greater than N2), PUCCH(~N3 bits) can transmit the B bits. Therefore, the terminal can transmit the B bits on PUCCH(~N3 bits).

[0427] Referring to FIG. 41(b), PUCCH (~N3 bits) overlaps with the invalid UL symbol and is thus invalid. Since PUCCH (~N1 bits) does not overlap with the invalid UL symbol, the terminal determines that the PUCCH is valid. The terminal can check whether it can transmit the B bits using PUCCH (~N1 bits). Since N1 is smaller than B, PUCCH (~N1 bits) cannot transmit the B bits. Therefore, since there is no valid configured PUCCH resource capable of transmitting the B bits, the terminal cannot transmit in (sub)slot n and can determine whether transmission is possible in (sub)slot n+1.

[0428] FIG. 42 is a diagram showing a method by which a terminal determines a valid PUCCH resource according to another example.

[0429] Referring to FIG. 42, PUCCH (~N3 bits) is valid because it does not overlap with the invalid UL symbol. PUCCH (~N4 bits) is valid because it does not overlap with the invalid UL symbol. Also, the two PUCCH resources can transmit the B bits. Here, N3 and N4 are larger values compared to B. Therefore, there are two or more valid PUCCH resources. In this case, the terminal must select one PUCCH resource. The terminal does not need to select a larger PUCCH resource to transmit the B bits. This is because if a larger PUCCH resource is selected, it may lead to waste of the PUCCH resource. Therefore, the terminal can select a smaller PUCCH resource. In FIG. 42, the terminal can select PUCCH (~N3 bits). Here, N3 is a smaller value than N4.

[0430] Second method: When there are multiple effectively configured PUCCH resources, the terminal can determine one PUCCH resource based on at least one of the start symbol, the last symbol, or the number of symbols of the PUCCH resource. Based on the start symbol, the PUCCH resource that starts earlier (the start symbol is the earliest) can be selected. This is because the PUCCH resource that starts earlier (the start symbol is the earliest) can reduce the delay time. Based on the last symbol, the PUCCH resource that ends earlier (the last symbol is the earliest) can be selected. This is because the PUCCH resource that ends earlier (the last symbol is the earliest) can reduce the delay time. Based on the number of symbols, the terminal can select the PUCCH resource with a larger number of symbols. This is because the PUCCH resource with a larger number of symbols can improve the reliability.

[0431] FIG. 43 is a diagram showing a method for a terminal to determine an effective PUCCH resource according to still another example.

[0432] Referring to FIG. 43, PUCCH (~N3 bits) is effective because it does not overlap with the invalid UL symbol. PUCCH (~N4 bits) is effective because it does not overlap with the invalid UL symbol. There are two or more effective PUCCH resources. In this case, the terminal must select one PUCCH resource. For example, as shown in FIG. 43(a), the terminal can select the PUCCH (~N3 bits) that starts earlier (the start symbol is the earliest). Also, as shown in FIG. 43(a), the terminal can select the PUCCH (~N3 bits) with a larger number of symbols. Or, as shown in FIG. 43(b), the terminal can select the PUCCH (~N4 bits) that ends earlier (the last symbol is the earliest).

[0433] FIG. 44 is a diagram showing a method for a terminal to determine an effective PUCCH resource according to still another example.

[0434] Referring to FIG. 44, PUCCH (~N3 bits) is valid because it does not overlap with the invalid UL symbol. PUCCH (~N4 bits) is valid because it does not overlap with the invalid UL symbol. There are two or more valid PUCCH resources. In this case, the terminal must select one PUCCH resource. However, some of the valid PUCCH resources may not meet the processing time conditions for PDSCH decoding and HARQ-ACK generation. In this case, the terminal cannot transmit a valid HARQ-ACK on the PUCCH resource. Therefore, it is preferable to select a PUCCH resource that meets the processing time conditions.

[0435] In FIG. 44, the PUCCH resource (~N3 bits) is a PUCCH resource that starts earlier (the start symbol is the earliest), but does not meet the processing time condition (T proc,1 ). Therefore, on PUCCH (~N3 bits), a valid HARQ-ACK for SPS PDSCH cannot be transmitted, and the terminal can select PUCCH (~N4 bits).

[0436] Third method: When there are multiple PUCCH resources set to be valid, the terminal can select one PUCCH resource based on the index of the PUCCH resource. The PUCCH resource may be assigned a unique index. The terminal can select the PUCCH resource corresponding to the lowest index (or a specific index configured by the upper layer) among the unique indexes of the validly configured PUCCH resources.

[0437] Fourth method: When there are multiple effectively configured PUCCH resources, and some of them are PUCCH resources configured for SPS HARQ-ACK transmission, and some of the others are PUCCH resources configured for DG HARQ-ACK transmission, the terminal can preferentially select one of the partial PUCCH resources. That is, among the multiple PUCCH resources, a PUCCH resource configured for SPS HARQ-ACK transmission can be preferentially selected to select one PUCCH resource. If one PUCCH resource cannot be selected from the PUCCH resources configured for SPS HARQ-ACK transmission, the terminal can select one PUCCH resource from the PUCCH resources configured for DG HARQ-ACK transmission. Conversely, a PUCCH resource configured for DG HARQ-ACK transmission can be preferentially selected from the multiple PUCCH resources to select one PUCCH resource. If one PUCCH resource cannot be selected from the PUCCH resources configured for DG HARQ-ACK transmission, a PUCCH resource can be selected from the PUCCH resources configured for SPS HARQ-ACK transmission.

[0438] Generally, URLLC services require short latency times. Therefore, the HARQ-ACK of SPS PDSCH for URLLC services needs to be transmitted within a certain time for retransmission within a short time. Therefore, when the HARQ-ACK of SPS PDSCH is delayed, if there is a maximum time by which it can be delayed, the HARQ-ACK transmission may not be necessary when exceeding the maximum time by which it can be delayed.

[0439] Still another embodiment of the present invention relates to a method for determining the maximum number of slots by which the HARQ-ACK of SPS PDSCH can be extended when it is extended.

[0440] Hereinafter, unless otherwise specifically mentioned in this specification, assume that when the HARQ-ACK of SPS PDSCH is transmitted on PUCCH, the PUCCH is repeatedly transmitted in a plurality of slots. Here, assume that the PUCCH is repeatedly transmitted in N slots.

[0441] When the PUCCH for transmitting HARQ-ACK is repeatedly transmitted in a plurality of slots, some of the plurality of slots may be slots within the slots that can be extended to the maximum extent (that is, slots that satisfy the delay time), and the remaining slots may be slots after the slots that can be extended to the maximum extent (that is, slots that do not satisfy the delay time).

[0442] Also, a plurality of SPS PDSCH configurations may be provided to one terminal. In this case, since each SPS PDSCH configuration can provide the same or different URLLC services, the same or different slots that can be extended to the maximum extent may be set for the SPS PDSCH configuration. The HARQ-ACK of SPS PDSCH according to the plurality of SPS PDSCH configurations may be transmitted on the same PUCCH. In other words, the HARQ-ACK included in one PUCCH may have the same or different slots that can be extended to the maximum extent depending on the same or different URLLC services.

[0443] The conditions to which this embodiment is applicable may include the following. i) The PUCCH on which the HARQ-ACK of SPS PDSCH is transmitted is repeatedly transmitted in a plurality of slots (N slots). ii) Two or more SPS PDSCH configurations are provided to one terminal. Here, the two or more SPS PDSCH configurations may include the same or different slots that can be extended to the maximum extent. iii) For the sake of convenience in this embodiment, it is described as two SPS PDSCH configurations, but this is not limited to two SPS PDSCH configurations and can also be applied to a larger number of SPS PDSCH configurations. The two SPS PDSCH configurations are referred to as SPS PDSCH configuration #0 and SPS PDSCH configuration #1.

[0444] FIG. 45 is an example of a scenario to which this embodiment is applied.

[0445] Referring to Figure 45, slots 0, 1, 3, and 4 are DL slots, and slots 2, 5, and 6 are UL slots. Here, in the DL slots, a terminal can receive downlink channels and signals, but cannot transmit uplink channels and signals. In the UL slots, a terminal can receive uplink channels and signals, but cannot transmit uplink channels and signals. In the present invention, for convenience, DL slots and UL slots are expressed, but they may also be expressed as DL symbols and UL symbols.

[0446] A terminal may be provided with two SPS PDSCH configurations. SPS PDSCH configuration #0 may configure the terminal to receive an SPS PDSCH (denoted as SPS0 in FIG. 31 and subsequent drawings) in slot 0. SPS PDSCH configuration #1 may configure the terminal to receive an SPS PDSCH (denoted as SPS1 in FIG. 31 and subsequent drawings) in slot 1.

[0447] The slot in which the HARQ-ACK is transmitted is determined by each SPS PDSCH configuration. The K1 value (K in FIG. 45 and the following drawings) indicates the slot in which the HARQ-ACK is transmitted in the SPS PDSCH configuration #0. 1,0 The K1 value (in FIG. 45 and the following figures, K 1,1 The HARQ-ACK for the SPS PDSCH (SPS0) set for reception in slot 0 must be transmitted in slot 2, and the HARQ-ACK for the SPS PDSCH (SPS1) set for reception in slot 1 must be transmitted in slot 2. That is, the terminal must transmit the HARQ-ACK for the SPS PDSCH (SPS0) in slot 0 and the SPS PDSCH (SPS1) in slot 1 in slot 2.

[0448] The PUCCH that transmits HARQ-ACK in slot 2 (the HARQ-ACK for the SPS PDSCH in slot 0 (SPS0) and the SPS PDSCH in slot 1 (SPS1)) may be repeatedly transmitted in multiple slots. Here, the number of multiple slots for repetition is 2. The terminal can repeatedly transmit the PUCCH in slot 2 and slot 3. The first repeatedly transmitted PUCCH may be designated as PUCCH Rep#0, and the second repeatedly transmitted PUCCH may be designated as PUCCH Rep#1. Slot 2 is an UL slot and PUCCH Rep#0 transmission is possible, while slot 3 is a DL slot and PUCCH Rep#0 transmission is not possible. The terminal can extend and transmit the PUCCH Rep#0 that should be transmitted in slot 3 to a slot where transmission is possible after slot 3. In Fig. 31, since slot 5 is an UL slot, the terminal can transmit PUCCH Rep#1 in slot 5. That is, the PUCCH that transmits the HARQ-ACK for the SPS PDSCH in slot 0 (SPS0) and the SPS PDSCH in slot 1 (SPS1) is repeatedly transmitted in slot 2 and slot 5.

[0449] The PUCCH Rep#1 that should be transmitted in slot 3 was extended to slot 5. If the base station can determine the accurate HARQ-ACK only after receiving all of PUCCH Rep#0 and PUCCH Rep#1, it has to wait until receiving the PUCCH Rep#1 transmitted in slot 5. In this case, the base station cannot instruct fast HARQ-ACK reception and retransmission. As another example, if the delay of the service transmitted by SPS is short and the base station can give the retransmission instruction only after transmitting the HARQ-ACK until at least slot 3, the base station cannot give the retransmission instruction even if it receives the PUCCH Rep#1 transmitted in slot 5. Therefore, it is necessary to determine whether it is necessary to transmit the PUCCH Rep#1 with extended transmission.

[0450] The services transmitted by SPS PDSCH configuration #0 and the services transmitted by SPS PDSCH configuration #1 may be given different service requirement conditions. For example, SPS PDSCH configuration #0 may be a service with a large delay time, and SPS PDSCH configuration #1 may be a service with a relatively short delay time. Therefore, among the HARQ-ACKs transmitted by PUCCH Rep#1 in slot 5, the HARQ-ACK of SPS0 by SPS PDSCH configuration #0 may be valid, and the HARQ-ACK of SPS1 by SPS PDSCH configuration #1 may not be valid. Accordingly, PUCCH Rep#1 in slot 5 needs to include the HARQ-ACK of SPS0, but does not need to include the HARQ-ACK of SPS1.

[0451] For reference, in the present invention, if the base station can retransmit within the delay time by HARQ-ACK, the HARQ-ACK is considered valid. Otherwise, the HARQ-ACK is considered invalid.

[0452] Let's assume that PUCCH Rep#0 contains HARQ-ACK information for both SPS0 and SPS1, and PUCCH Rep#1 contains HARQ-ACK information for SPS0 but not for SPS1. In this case, the reception method of PUCCH Rep#0 and PUCCH Rep#1 at the base station may become complicated. When the PUCCH is repeatedly transmitted in multiple slots, the PUCCH transmitted in each slot always contains the same UCI (Uplink control information). Therefore, the base station can perform soft-combining on the PUCCH received in each slot to determine the UCI. However, if the UCI contained in PUCCH Rep#0 is different from the UCI contained in PUCCH Rep#1, it is difficult for the base station to perform soft-combining, so a more complex receiver must be used. Also, if the size of the UCI transmitted by the PUCCH in each slot changes, the PUCCH resource may change. Therefore, as much as possible, the PUCCH repeatedly transmitted in multiple slots must contain the same UCI.

[0453] To solve such problems, embodiments of the present invention are disclosed.

[0454] First, prior to describing the embodiments, the validity of two HARQ-ACKs can be determined as follows.

[0455] Validity of HARQ-ACK

[0456] (Condition 1): If K1 + K def ≤ Y is satisfied, it is valid. Otherwise, it is invalid.

[0457] (Condition 2): If K def ≤ Y is satisfied, it is valid. Otherwise, it is invalid.

[0458] Under the above Conditions 1 and 2, Y represents the maximum delay time. For the convenience of the present invention, the unit of Y is a slot, but the unit of Y may be a symbol or an absolute time (e.g., ms), etc. The Y value may be the same or different for each SPS PDSCH configuration. For example, the Y value may be included in each SPS PDSCH configuration. For example, SPS PDSCH configuration #0 can set Y as the maximum delay time, and SPS PDSCH configuration #1 can set Y1 as the maximum delay time. Here, the Y0 and Y1 values may be the same or different. -0 can be set, and SPS PDSCH configuration #1 can set Y1 as the maximum delay time. Here, the Y0 and Y1 values may be the same or different.

[0459] Under Condition 1, K1 indicates the interval between the slot to which the PDSCH belongs and the slot in which the HARQ-ACK is transmitted. The K1 value may be indicated by the SPS PDSCH configuration or by the DCI (downlink control information) that activates the SPS PDSCH. The K1 value may be different for each SPS PDSCH configuration. For example, in SPS PDSCH configuration #0, K can be indicated as the K1 value, and in SPS PDSCH configuration #1, K 1,0 can be indicated as the K1 value. 1,1 can be indicated.

[0460] Under Conditions 1 and 2, K def represents the delay caused by the extension of the PUCCH transmission. More specifically, when the PUCCH is repeatedly transmitted in multiple slots, K def may be defined as follows.

[0461] K def Definition of

[0462] The K def value of the Nth PUCCH repetition may be determined by one of the following two options.

[0463] (Option 1): The difference between the slot indicated by the first PUCCH repetition transmission (the slot indicated by the K1 value) and the slot of the Nth PUCCH repetition transmission actually transmitted

[0464] (Option 2): The difference between the slot in which the Nth PUCCH retransmission is indicated (when the slot in which the K1 value is indicated is taken as the slot in which the first PUCCH retransmission is indicated, the slot in which the Nth PUCCH retransmission is indicated) and the Nth PUCCH retransmission slot actually transmitted

[0465] According to Option 1, K def value indicates how much later the Nth PUCCH retransmission is transmitted from the slot in which the first PUCCH retransmission is indicated. That is, K def value indicates how much later the Nth PUCCH retransmission is transmitted compared to the transmission of the first PUCCH.

[0466] According to Option 2, K def value indicates the delay time between the slot in which the Nth PUCCH retransmission is indicated before the extended transmission and the Nth PUCCH retransmission slot actually transmitted. That is, it indicates how much delay time occurs for each PUCCH retransmission.

[0467] In this way, the terminal can check the validity of HARQ-ACK in slot units. However, the proposal of the present invention can be applied to checking the validity of HARQ-ACK in symbol units. In this case, the validity of HARQ-ACK may be checked as follows.

[0468] Validity of HARQ-ACK (in symbol units)

[0469] (Condition 1): It is valid if it is smaller than or equal to the interval Y between the last symbol of the PDSCH and the last symbol of the Nth PUCCH retransmission actually transmitted. Otherwise, it is invalid.

[0470] (Condition 2-1): It is valid if the interval between the last symbol of the indicated first PUCCH retransmission and the last symbol of the Nth PUCCH retransmission actually transmitted is smaller than or equal to Y. Otherwise, it is invalid.

[0471] (Condition 2-2): It is valid if the interval between the last symbol of the indicated Nth PUCCH retransmission and the last symbol of the actually transmitted Nth PUCCH retransmission is less than or equal to Y. Otherwise, it is invalid.

[0472] Here, the last symbol of the PUCCH retransmission may be replaced by the first symbol of the PUCCH retransmission. Embodiments of the present invention are as follows.

[0473] First Embodiment: The terminal checks the validity of HARQ-ACK in the first PUCCH retransmission and transmits a valid HARQ-ACK in the first PUCCH retransmission. An invalid HARQ-ACK is not transmitted in the PUCCH retransmission. Thereafter, the PUCCH retransmission is transmitted including the same HARQ-ACK as the first PUCCH retransmission. When the terminal is instructed or configured to transmit the PUCCH N times in repetition, the terminal transmits the PUCCH N times in repetition.

[0474] Second Embodiment: The terminal checks the validity of Deferral HARQ-ACK in the first PUCCH retransmission and transmits a valid HARQ-ACK in the first PUCCH retransmission. An invalid HARQ-ACK is not transmitted in the PUCCH retransmission. Thereafter, the PUCCH retransmission includes the same HARQ-ACK as the first PUCCH retransmission. If all HARQ-ACKs to be transmitted in subsequent PUCCH retransmissions are invalid, the terminal does not transmit that PUCCH retransmission and subsequent PUCCH retransmissions. That is, even if the terminal is instructed or configured to transmit the PUCCH N times in repetition, if all HARQ-ACKs included in the PUCCH retransmission are invalid, the terminal does not transmit that PUCCH.

[0475] Third Embodiment: The terminal checks the validity of HARQ-ACK in the last PUCCH repetition and transmits a valid HARQ-ACK in the last PUCCH repetition. An invalid HARQ-ACK is not transmitted in the PUCCH repetition. The PUCCH repetitions before the last PUCCH repetition include the same HARQ-ACK as the last PUCCH repetition. When the terminal is instructed or configured to transmit the PUCCH by repeating N times, the terminal transmits the PUCCH by repeating N times.

[0476] The terminal may receive DCI and be instructed to retransmit the SPS PDSCH. In this case, the terminal does not need to transmit the HARQ-ACK of the SPS PDSCH in further PUCCH repetitions. Therefore, the HARQ-ACK can be regarded as an invalid HARQ-ACK when the retransmission of the SPS PDSCH is instructed by DCI in the first to third embodiments.

[0477] First Embodiment, Validity of HARQ-ACK: First Condition (K1 + K def ≦ Y) Method

[0478] FIG. 46 illustrates a method by which a terminal determines the validity of HARQ-ACK according to an example.

[0479] Referring to FIG. 46(a), the terminal is instructed to repeatedly transmit the HARQ-ACK of SPS0 and the HARQ-ACK of SPS1 in slot 2 and slot 3. Slot 3 is a DL slot and PUCCH Rep#1 cannot be transmitted, so PUCCH Rep#1 is transmitted in slot 5. The maximum delay time is Y 1,0 = 4 in SPS PDSCH configuration #0, and the maximum delay time is Y 1,1 = 4 in SPS PDSCH configuration #1. Here, the validity of HARQ-ACK follows the aforementioned condition 1 (K1 + K def ≦ Y) method.

[0480] According to the first embodiment of the present invention, the terminal can determine the validity of HARQ-ACK with PUCCH Rep#0 which is the first PUCCH repetition. Here, since the slot indicated for transmission and the slot actually transmitted are the same for PUCCH Rep#0, K def =0. The validity of HARQ-ACK of SPS0 is K 1,0 +K def =2, so since Y0 is not greater than 4, it is valid. Also, the validity of HARQ-ACK of SPS1 is K 1,1 +K def =1, and since Y1 is not greater than 4, it is valid. Therefore, since the HARQ-ACK of SPS0 and the HARQ-ACK of SPS1 are valid in PUCCH Rep#0, the terminal can include both HARQ-ACK information in PUCCH Rep#0 for transmission. The terminal can include both HARQ-ACK information in later PUCCH repetitions (PUCCH Rep#1) for transmission.

[0481] The terminal is instructed to repeatedly transmit the HARQ-ACK of SPS0 and the HARQ-ACK of SPS1 in slot 2 and slot 3. Slot 2 is a DL slot and PUCCH Rep#0 cannot be transmitted, so PUCCH Rep#0 is transmitted in slot 5. Slot 3 is a DL slot and PUCCH Rep#1 cannot be transmitted, so PUCCH Rep#0 is transmitted in slot 6. In SPS PDSCH configuration #0, the maximum delay time is Y 1,0 =4, and in SPS PDSCH configuration #1, the maximum delay time is Y 1,1 =4. Here, the validity of HARQ-ACK follows the above-mentioned condition 1 (K1+K def ≦Y) method.

[0482] According to the first embodiment of the present invention, the terminal can determine the validity of HARQ-ACK with PUCCH Rep#0 which is the first PUCCH repetition. Here, since the slot indicated for transmission (slot 2) and the slot actually transmitted (slot 5) for PUCCH Rep#0 have a difference of 3 slots, K def= 3. The validity of the HARQ-ACK of SPS0 is K 1,0 + K def = 5, and since Y0 = 4 is not greater than this, it is not valid. Also, the validity of the HARQ-ACK of SPS1 is K 1,1 + K def = 4, and since Y1 = 4 is not greater than this, it is valid. That is, since the HARQ-ACK of SPS1 is valid in PUCCH Rep#0, the terminal can include the HARQ-ACK information of SPS1 in PUCCH Rep#0 and transmit it. The terminal can include the HARQ-ACK information of SPS1 and transmit it in a later PUCCH repetition (PUCCH Rep#1). Here, the HARQ-ACK information of SPS0 is not transmitted (dropped).

[0483] First Embodiment, Validity of HARQ-ACK: Second Condition (K def ≤ Y) Method

[0484] FIG. 47 illustrates a method by which a terminal determines the validity of HARQ-ACK according to another example.

[0485] Referring to FIG. 47(a), the terminal is instructed to repeatedly transmit the HARQ-ACK of SPS0 and the HARQ-ACK of SPS1 in slot 2 and slot 3. Slot 3 is a DL slot and PUCCH Rep#1 cannot be transmitted, so PUCCH Rep#1 is transmitted in slot 5. In SPS PDSCH configuration #0, the maximum delay time is Y 1,0 = 2, and in SPS PDSCH configuration #1, the maximum delay time is Y 1,1 = 4. Here, the validity of the HARQ-ACK follows the aforementioned condition 2 (K def ≤ Y) method.

[0486] According to the first embodiment, the terminal can determine the validity of the HARQ-ACK in PUCCH Rep#0, which is the first PUCCH repetition. Here, since the slot in which transmission is instructed and the slot in which it is actually transmitted are the same for PUCCH Rep#0, K def = 0. The validity of the HARQ-ACK of SPS0 is K def=0, and since Y0 is not greater than 2, it is valid. Also, the validity of the HARQ-ACK of SPS1 is K def =0, and since Y1 is not greater than 4, it is valid. That is, since the HARQ-ACKs of SPS0 and SPS1 are valid in PUCCH Rep#0, the terminal can include both HARQ-ACK information in PUCCH Rep#0 and transmit it. The terminal can include both HARQ-ACK information and transmit it in a later PUCCH repetition (PUCCH Rep#1).

[0487] The terminal is instructed to repeatedly transmit the HARQ-ACKs of SPS0 and SPS1 in slot 2 and slot 3. Slot 2 is a DL slot and PUCCH Rep#0 cannot be transmitted, so PUCCH Rep#0 is transmitted in slot 5. Slot 3 is a DL slot and PUCCH Rep#1 cannot be transmitted, so PUCCH Rep#0 is transmitted in slot 6. In SPS PDSCH configuration #0, the maximum latency is Y 1,0 =2, and in SPS PDSCH configuration #1, the maximum latency is Y 1,1 =4. Here, the validity of the HARQ-ACK follows the aforementioned condition 2 (K def ≤Y) method.

[0488] According to the first embodiment, the terminal can determine the validity of the HARQ-ACK in PUCCH Rep#0, which is the first PUCCH repetition. Here, since the slot (slot 2) where transmission is instructed and the slot (slot 5) where it is actually transmitted are the same for PUCCH Rep#0, K def =3. The validity of the HARQ-ACK of SPS0 is K def =3, and since Y0 is greater than 2, it is not valid. Also, the validity of the HARQ-ACK of SPS1 is K defSince =3 and Y1 is not greater than 4, it is valid. That is, since the HARQ-ACK of SPS1 is valid in PUCCH Rep#0, the terminal can transmit the HARQ-ACK information of SPS1 by including it in PUCCH Rep#0. The terminal can transmit by including the HARQ-ACK information of SPS1 in a later PUCCH repetition (PUCCH Rep#1). Here, the HARQ-ACK information of SPS0 is not transmitted (dropped).

[0489] Second Embodiment, HARQ-ACK Validity: First Condition (K1 + K def ≦Y) Method, K def : Option 1 Method

[0490] FIG. 48 illustrates a method by which a terminal determines the validity of HARQ-ACK according to still another example.

[0491] Referring to FIG. 48(a), the terminal is instructed to repeatedly transmit the HARQ-ACK of SPS0 and the HARQ-ACK of SPS1 in slots 2, 3, and 4. Slot 3 is a DL slot and PUCCH Rep#1 cannot be transmitted, so PUCCH Rep#1 is transmitted in slot 5. Slot 4 is a DL slot and PUCCH Rep#2 cannot be transmitted, so PUCCH Rep#2 is transmitted in slot 6. In SPS PDSCH Configuration #0, the maximum delay time is Y 1,0 =4, and in SPS PDSCH Configuration #1, the maximum delay time is Y 1,1 =4. Here, the validity of HARQ-ACK follows the aforementioned Condition 1 (K1 + K def ≦Y) method. And K def is determined by the method of Option 1.

[0492] According to the second embodiment, the terminal can determine the validity of HARQ-ACK in PUCCH Rep#0, which is the first PUCCH repetition. Here, since the slot in which transmission is instructed and the slot actually transmitted are the same for PUCCH Rep#0, K def =0. The validity of the HARQ-ACK of SPS0 is K1,0 +K def = 2, and since Y0 is not greater than 4, it is valid. Also, the validity of the HARQ-ACK of SPS1 is related to K 1,1 +K def = 1, and since Y1 is not greater than 4, it is valid. That is, since the HARQ-ACK of SPS0 and the HARQ-ACK of SPS1 are valid in PUCCH Rep#0, the terminal can include both HARQ-ACK information in PUCCH Rep#0 for transmission. When subsequent PUCCH repetitions (PUCCH Rep#1, PUCCH Rep#2) are transmitted, the terminal can include both HARQ-ACK information for transmission.

[0493] After that, whether a PUCCH repetition is transmitted or not is determined as follows. The terminal can determine the validity of the HARQ-ACK in PUCCH Rep#1 to decide whether to transmit PUCCH Rep#1, which is the second PUCCH repetition. Here, the value of K def is determined by Option1. For the slot (slot 2) where the transmission of the first PUCCH is indicated and the slot (slot 5) where PUCCH Rep#1 is actually transmitted, so K def = 3. The validity of the HARQ-ACK of SPS0 is related to K 1,0 +K def = 5, and since Y0 is greater than 4, it is not valid. Also, the validity of the HARQ-ACK of SPS1 is related to K 1,1 +K def = 4, and since Y1 is not greater than 4, it is valid. The HARQ-ACK of SPS0 is not valid in PUCCH Rep#1, but the HARQ-ACK of SPS1 is valid. That is, since at least one HARQ-ACK is valid, the terminal transmits PUCCH Rep#1. Here, PUCCH Rep#1 includes the same UCI as PUCCH Rep#0, which is the first repetition. That is, PUCCH Rep#1 includes the HARQ-ACK of SPS0 that is not valid and the HARQ-ACK of SPS1 that is valid.

[0494] The terminal can determine the validity of HARQ-ACK in PUCCH Rep#1 to decide whether to transmit PUCCH Rep#2, which is the third PUCCH repetition. Here, K def The value of is Option1. Since the slot (slot 2) where the transmission of the first PUCCH is instructed and the slot (slot 6) where PUCCH Rep#2 is actually transmitted, K def = 4. The validity of the HARQ-ACK of SPS0 is K 1,0 + K def = 6. Since Y0 = 4 is greater, it is not valid. Also, the validity of the HARQ-ACK of SPS1 is K 1,1 + K def = 5. Since Y1 = 4 is greater, it is not valid. Therefore, the HARQ-ACK of SPS0 and SPS1 in PUCCH Rep#2 is not valid. That is, since all HARQ-ACKs are not valid, the terminal does not transmit (drop) PUCCH Rep#2.

[0495] The terminal is instructed to repeatedly transmit the HARQ-ACK of SPS0 and SPS1 in slot 2 and slot 3. Slot 2 is a DL slot and PUCCH Rep#0 cannot be transmitted, so PUCCH Rep#0 is transmitted in slot 5. Slot 3 is a DL slot and PUCCH Rep#1 cannot be transmitted, so PUCCH Rep#1 is transmitted in slot 6. In SPS PDSCH configuration #0, the maximum delay time is Y 1,0 = 4, and in SPS PDSCH configuration #1, the maximum delay time is Y 1,1 = 4. Here, the validity of HARQ-ACK follows the above-mentioned condition 1 (K1 + K def ≤ Y) method. And K def is determined by the Option 1 method.

[0496] According to the second embodiment, the terminal can determine the validity of HARQ-ACK in the first PUCCH repetition, i.e., PUCCH Rep#0. Here, according to Option 1, the slot (Slot 2) where the transmission of the first PUCCH is indicated and the slot (Slot 5) where PUCCH Rep#0 is actually transmitted have a K def = 3. The validity of the HARQ-ACK of SPS0 is K 1,0 + K def = 5, which is not valid because it is greater than Y0 = 4. Also, the validity of the HARQ-ACK of SPS1 is K 1,1 + K def = 1, which is valid because it is not greater than Y1 = 4. Therefore, the HARQ-ACK of SPS0 is not valid with PUCCH Rep#0, and the HARQ-ACK of SPS1 is valid. The terminal can include the valid SPS HARQ-ACK information in PUCCH Rep#0 for transmission. After that, when the PUCCH repetition (PUCCH Rep#1) is transmitted, the HARQ-ACK information of SPS1 can be included for transmission. However, the HARQ-ACK information of SPS0 is not transmitted (dropped).

[0497] After that, whether the PUCCH repetition is transmitted or not is determined as follows. The terminal can determine the validity of HARQ-ACK in PUCCH Rep#1 to determine whether to transmit PUCCH Rep#1, which is the second PUCCH repetition. Here, the value of K def is, according to Option 1, the slot (Slot 2) where the transmission of the first PUCCH is indicated and the slot (Slot 6) where PUCCH Rep#1 is actually transmitted, so K def = 4. The validity of the HARQ-ACK of SPS1 is K 1,1 + K def = 5, which is not valid because it is greater than Y1 = 4. Therefore, since all HARQ-ACKs are not valid, PUCCH Rep#1 is not transmitted (dropped). For reference, since the HARQ-ACK of SPS0 was dropped during the first PUCCH repetition transmission, there is no need to confirm its validity.

[0498] Second Embodiment, Effectiveness of HARQ-ACK: First Condition (K1 + K def ≦Y) Method, K def : Option 2 Method

[0499] FIG. 49 illustrates a method by which a terminal determines the effectiveness of HARQ-ACK according to an example.

[0500] Referring to FIG. 49(a), the terminal is instructed to repeatedly transmit the HARQ-ACK of SPS0 and the HARQ-ACK of SPS1 in slots 2, 3, and 4. Slot 3 is a DL slot, and since PUCCH Rep#1 cannot be transmitted, PUCCH Rep#1 is transmitted in slot 5. Slot 4 is a DL slot, and since PUCCH Rep#2 cannot be transmitted, PUCCH Rep#2 is transmitted in slot 6. In SPS PDSCH configuration #0, the maximum delay time is Y 1,0 = 4, and in SPS PDSCH configuration #1, the maximum delay time is Y 1,1 = 4. Here, the effectiveness of the HARQ-ACK follows the aforementioned condition 1 (K1 + K def ≦Y) method. And K def is determined by the method of Option 2.

[0501] According to the second embodiment, the terminal can determine the effectiveness of the HARQ-ACK with PUCCH Rep#0, which is the first PUCCH repetition. Here, the value of K def is determined by Option 2. For PUCCH Rep#0, since the slot where transmission is instructed (slot 2) and the slot where PUCCH Rep#0 is actually transmitted (slot 2) are the same, K def = 0. The effectiveness of the HARQ-ACK of SPS0 is K 1,0 + K def = 2, which is not greater than Y0 = 4, so it is effective. Also, the effectiveness of the HARQ-ACK of SPS1 is K 1,1 + K defSince it is equal to 1 and not greater than 4 for Y1, it is valid. That is, since the HARQ-ACKs of SPS0 and SPS1 are valid in PUCCH Rep#0, the terminal can transmit both HARQ-ACK information included in PUCCH Rep#0. Thereafter, when PUCCH repetitions (PUCCH Rep#1, PUCCH Rep#2) are transmitted, both HARQ-ACK information can be transmitted.

[0502] Thereafter, whether PUCCH repetitions are transmitted or not is determined as follows. The terminal can determine the validity of HARQ-ACK in PUCCH Rep#1 to determine whether to transmit PUCCH Rep#1, which is the second PUCCH repetition. Here, K def The value of is, according to Option 2, the slot (slot 3) in which the transmission of PUCCH Rep#1 is indicated and the slot (slot 5) in which PUCCH Rep#1 is actually transmitted, so K def = 2. The validity of the HARQ-ACK of SPS0 is K 1,0 + K def = 4, and since it is greater than 4 for Y0, it is not valid. Also, the validity of the HARQ-ACK of SPS1 is K 1,1 + K def = 3, and since it is not greater than 4 for Y1, it is valid. Therefore, the HARQ-ACK of SPS0 is not valid in PUCCH Rep#1, but the HARQ-ACK of SPS1 is valid. That is, since at least one HARQ-ACK is valid, the terminal transmits PUCCH Rep#1. Here, PUCCH Rep#1 includes the same UCI as PUCCH Rep#0, which is the first repetition. That is, PUCCH Rep#1 includes the HARQ-ACK of SPS0 that is not valid and the HARQ-ACK of SPS1 that is valid.

[0503] The terminal can determine the validity of HARQ-ACK in PUCCH Rep#2 to determine whether to transmit PUCCH Rep#2, which is the third PUCCH repetition. Here, K defThe value of K is determined by Option 2 and is the slot (Slot 4) where transmission of PUCCH Rep#2 is indicated and the slot (Slot 6) where PUCCH Rep#2 is actually transmitted. def So K 1,0 + K def = 4. Since it is greater than Y0 = 4, the HARQ-ACK of SPS0 is not valid. Also, for the HARQ-ACK of SPS1, K 1,1 + K def = 3, and since it is not greater than Y1 = 4, it is valid. Therefore, the HARQ-ACK of SPS0 is not valid with PUCCH Rep#2, but the HARQ-ACK of SPS1 is valid. That is, since at least one HARQ-ACK is valid, the terminal transmits PUCCH Rep#2. Here, PUCCH Rep#2 contains the same UCI as PUCCH Rep#0 which is the first repetition. That is, PUCCH Rep#2 contains the HARQ-ACK of SPS0 which is not valid and the HARQ-ACK of SPS1 which is valid.

[0504] Referring to Fig. 49(b), the terminal is instructed to repeatedly transmit the HARQ-ACK of SPS0 and SPS1 in Slot 2 and Slot 3. Slot 2 is a DL slot and since PUCCH Rep#0 cannot be transmitted, PUCCH Rep#0 is transmitted in Slot 5. Slot 3 is a DL slot and since PUCCH Rep#1 cannot be transmitted, PUCCH Rep#1 is transmitted in Slot 6. In SPS PDSCH configuration #0, the maximum delay time is Y 1,0 = 4, and in SPS PDSCH configuration #1, the maximum delay time is Y 1,1 = 4. Here, the validity of the HARQ-ACK follows the above-mentioned condition 1 (K1 + K def ≤ Y) method. And K def is determined by the method of Option 2.

[0505] According to the second embodiment, the terminal can determine the validity of HARQ-ACK in PUCCH Rep#0, which is the first PUCCH repetition. Here, according to Option 2, the slot (Slot 2) indicated by PUCCH Rep#0 and the slot (Slot 5) where PUCCH Rep#0 is actually transmitted have a K def = 3. The validity of the HARQ-ACK of SPS0 is K 1,0 + K def = 5, which is not valid because it is greater than Y0 = 4. Also, the validity of the HARQ-ACK of SPS1 is K 1,1 + K def = 4, which is valid because it is not greater than Y1 = 4.

[0506] Therefore, the HARQ-ACK of SPS0 is not valid in PUCCH Rep#0, and the HARQ-ACK of SPS1 is valid. The terminal can include the valid HARQ-ACK information of SPS1 in PUCCH Rep#0 and transmit it. After that, when the PUCCH repetition (PUCCH Rep#1) is transmitted, the HARQ-ACK information of SPS1 can be included and transmitted. However, the HARQ-ACK information of SPS0 is not transmitted (dropped).

[0507] After that, whether the PUCCH repetition is transmitted or not is determined as follows. The terminal can determine the validity of HARQ-ACK in PUCCH Rep#1 to determine whether to transmit PUCCH Rep#1, which is the second PUCCH repetition. Here, the value of K def is, according to Option 2, the slot (Slot 3) indicated for the transmission of PUCCH Rep#1 and the slot (Slot 6) where PUCCH Rep#1 is actually transmitted, so K def = 3. The validity of the HARQ-ACK of SPS1 is K 1,1 + K def= 4, and since Y1 is not greater than 4, it is valid. That is, since at least one HARQ-ACK is valid, the terminal transmits PUCCH Rep#1. Here, PUCCH Rep#1 contains the same UCI as PUCCH Rep#0 which is the first repetition. That is, PUCCH Rep#1 contains the HARQ-ACK of SPS1.

[0508] Second Embodiment, HARQ-ACK Validity: Second Condition (K def ≦ Y) Method, K def : Option 1 Method

[0509] FIG. 50 illustrates a method by which a terminal determines the validity of HARQ-ACK according to another example.

[0510] Referring to FIG. 50(a), the terminal is instructed to repeatedly transmit the HARQ-ACK of SPS0 and the HARQ-ACK of SPS1 in slot 2, slot 3, and slot 4. Since slot 3 is a DL slot and PUCCH Rep#1 cannot be transmitted, PUCCH Rep#1 is transmitted in slot 5. Since slot 4 is a DL slot and PUCCH Rep#2 cannot be transmitted, PUCCH Rep#2 is transmitted in slot 6. In SPS PDSCH configuration #0, the maximum delay time is Y 1,0 = 2, and in SPS PDSCH configuration #1, the maximum delay time is Y 1,1 = 3. Here, the validity of the HARQ-ACK follows the aforementioned condition 2 (K def ≦ Y) method. And K def is determined by the method of Option 1.

[0511] According to the second embodiment, the terminal can determine the validity of the HARQ-ACK with PUCCH Rep#0 which is the first PUCCH repetition. Here, the value of K def is determined by Option 1. Since the slot (slot 2) in which the transmission of the first PUCCH is instructed and the slot (slot 2) in which PUCCH Rep#0 is actually transmitted are the same, K def = 0. The validity of the HARQ-ACK of SPS0 is Kdef = 0 and since Y0 is not greater than 2, it is valid. Also, the validity of the HARQ-ACK of SPS1 is determined by K def = 2 and since Y1 is not greater than 3, it is valid. That is, since the HARQ-ACKs of SPS0 and SPS1 are valid in PUCCH Rep#0, the terminal can include both HARQ-ACK information in PUCCH Rep#0 for transmission. Thereafter, when PUCCH repetitions (PUCCH Rep#1, PUCCH Rep#2) are transmitted, both HARQ-ACK information can be included for transmission.

[0512] Thereafter, whether PUCCH repetitions are transmitted or not is determined as follows. The terminal can determine the validity of the HARQ-ACK in PUCCH Rep#1 to determine whether to transmit PUCCH Rep#1, which is the second PUCCH repetition. Here, K def has a value according to Option 1, which is the slot (slot 2) where the transmission of the first PUCCH is indicated and the slot (slot 5) where PUCCH Rep#1 is actually transmitted. So, K def = 3. The validity of the HARQ-ACK of SPS0 is determined by K def = 3 and since Y0 is greater than 2, it is not valid. Also, the validity of the HARQ-ACK of SPS1 is determined by K def = 3 and since Y1 is not greater than 3, it is valid. Therefore, the HARQ-ACK of SPS0 is not valid in PUCCH Rep#1, but the HARQ-ACK of SPS1 is valid. That is, since at least one HARQ-ACK is valid, the terminal transmits PUCCH Rep#1. Here, PUCCH Rep#1 includes the same UCI as PUCCH Rep#0, which is the first repetition. That is, PUCCH Rep#1 includes the HARQ-ACK of SPS0 that is not valid and the HARQ-ACK of SPS1 that is valid.

[0513] The terminal can determine the validity of the HARQ-ACK in PUCCH Rep#2 to determine whether to transmit PUCCH Rep#2, which is the third PUCCH repetition. Here, K defThe value of K is the slot (slot 2) where the transmission of the first PUCCH is indicated by option 1 and the slot (slot 6) where PUCCH Rep#2 is actually transmitted. Therefore, def K = 4. The validity of the HARQ-ACK of SPS0 is that K def = 4, and since Y0 = 2 is greater, it is not valid. Also, the validity of the HARQ-ACK of SPS1 is that K def = 4, and since Y1 = 3 is greater, it is not valid. That is, since the HARQ-ACK of all SPSs is not valid for PUCCH Rep#2, the terminal does not transmit (drops) PUCCH Rep#2.

[0514] Referring to FIG. 40(b), the terminal is instructed to repeatedly transmit the HARQ-ACK of SPS0 and SPS1 in slot 2 and slot 3. Slot 2 is a DL slot and since PUCCH Rep#0 cannot be transmitted, PUCCH Rep#0 is transmitted in slot 5. Slot 3 is a DL slot and since PUCCH Rep#1 cannot be transmitted, PUCCH Rep#1 is transmitted in slot 6. In SPS PDSCH configuration #0, the maximum delay time is Y 1,0 = 2, and in SPS PDSCH configuration #1, the maximum delay time is Y 1,1 = 3. Here, the validity of the HARQ-ACK follows the aforementioned condition 2 (K def ≤ Y) method. And K def is determined by the method of option 1.

[0515] According to the second embodiment, the terminal can determine the validity of the HARQ-ACK with PUCCH Rep#0 which is the first PUCCH repetition. Here, by option 1, the slot (slot 2) where the transmission of the first PUCCH is indicated and the slot (slot 5) where PUCCH Rep#0 is actually transmitted are such that K def = 3. The validity of the HARQ-ACK of SPS0 is that K def = 3, and since Y0 = 2 is greater, it is not valid. Also, the validity of the HARQ-ACK of SPS1 is that K defSince = 3 and Y1 is not greater than 3, it is valid.

[0516] Therefore, the HARQ-ACK of SPS0 is not valid in PUCCH Rep#0, while the HARQ-ACK of SPS1 is valid. The terminal can include the valid HARQ-ACK information of SPS1 in PUCCH Rep#0 and transmit it. Subsequently, when the PUCCH repetition (PUCCH Rep#1) is transmitted, the HARQ-ACK information of SPS1 can be included and transmitted. However, the HARQ-ACK information of SPS0 is not transmitted (dropped).

[0517] Subsequently, whether the PUCCH repetition is transmitted or not is determined as follows. The terminal can determine the validity of HARQ-ACK in PUCCH Rep#1 to determine whether to transmit PUCCH Rep#1, which is the second PUCCH repetition. Here, K def The value of is, according to Option 1, the slot (Slot 2) where the transmission of the first PUCCH is indicated and the slot (Slot 6) where PUCCH Rep#1 is actually transmitted. Therefore, K def = 4. The validity of the HARQ-ACK of SPS1 is that K def = 4 and Y1 is greater than 3, so it is not valid. Therefore, since the HARQ-ACK of all SPSs is not valid in PUCCH Rep#1, PUCCH Rep#1 is not transmitted (dropped).

[0518] Second Embodiment, Validity of HARQ-ACK: Second Condition (K def ≤ Y) Method, K def : Option 2 Method

[0519] FIG. 51 illustrates a method by which a terminal determines the validity of HARQ-ACK according to yet another example.

[0520] Referring to Fig. 51(a), the terminal is instructed to repeatedly transmit the HARQ-ACK of SPS0 and the HARQ-ACK of SPS1 in slot 2, slot 3, and slot 4. Slot 3 is a DL slot, and since PUCCH Rep#1 cannot be transmitted, PUCCH Rep#1 is transmitted in slot 5. Slot 4 is a DL slot, and since PUCCH Rep#2 cannot be transmitted, PUCCH Rep#2 is transmitted in slot 6. In SPS PDSCH configuration #0, the maximum delay time is Y 1,0 =1, and in SPS PDSCH configuration #1, the maximum delay time is Y 1,1 =2. Here, the validity of the HARQ-ACK follows the aforementioned condition 2 (K def ≦Y) method. And K def is determined by the method of option 2.

[0521] According to the second embodiment, the terminal can determine the validity of the HARQ-ACK with PUCCH Rep#0, which is the first PUCCH repetition. Here, the value of K def is determined by option 2. For PUCCH Rep#0, since the slot where transmission is instructed (slot 2) is the same as the slot where PUCCH Rep#0 is actually transmitted (slot 2), K def =0. The validity of the HARQ-ACK of SPS0 is that K def =0 and it is not greater than Y0 = 1, so it is valid. Also, the validity of the HARQ-ACK of SPS1 is that K def =0 and it is not greater than Y1 = 2, so it is valid. Therefore, the HARQ-ACK of SPS0 and the HARQ-ACK of SPS1 are valid with PUCCH Rep#0. That is, since the HARQ-ACK of SPS0 and the HARQ-ACK of SPS1 are valid with PUCCH Rep#0, the terminal can include both HARQ-ACK information in PUCCH Rep#0 and transmit it.

[0522] After that, when PUCCH repetitions (PUCCH Rep#1, PUCCH Rep#2) are transmitted, both HARQ-ACK information can be transmitted. After that, whether PUCCH repetitions are transmitted or not is determined as follows. The terminal can determine the validity of HARQ-ACK with PUCCH Rep#1 to determine whether to transmit PUCCH Rep#1, which is the second PUCCH repetition. Here, K def The value of is, according to Option 2, the slot (slot 3) in which the transmission of PUCCH Rep#1 is indicated and the slot (slot 5) in which PUCCH Rep#1 is actually transmitted. So, K def = 2. The validity of HARQ-ACK of SPS0 is that K def = 2 and since Y0 = 1 is greater, it is not valid. Also, the validity of HARQ-ACK of SPS1 is that K def = 2 and since Y1 = 2 is not greater, it is valid. Therefore, the HARQ-ACK of SPS0 with PUCCH Rep#1 is not valid, but the HARQ-ACK of SPS1 is valid. That is, since at least one HARQ-ACK is valid, the terminal transmits PUCCH Rep#1. Here, PUCCH Rep#1 contains the same UCI as PUCCH Rep#0 which is the first repetition. That is, PUCCH Rep#1 contains the HARQ-ACK of SPS0 which is not valid and the HARQ-ACK of SPS1 which is valid.

[0523] The terminal can determine the validity of HARQ-ACK with PUCCH Rep#2 to determine whether to transmit PUCCH Rep#2, which is the third PUCCH repetition. Here, K def The value of is, according to Option 2, the slot (slot 4) in which the transmission of PUCCH Rep#2 is indicated and the slot (slot 6) in which PUCCH Rep#2 is actually transmitted. So, K def = 2. The validity of HARQ-ACK of SPS0 is that K def = 2 and since Y0 = 1 is greater, it is not valid. Also, the validity of HARQ-ACK of SPS1 is that K defSince =2 and Y1 is not greater than 2, it is valid. Therefore, the HARQ-ACK of SPS0 is not valid in PUCCH Rep#2, but the HARQ-ACK of SPS1 is valid. That is, since at least one HARQ-ACK is valid, the terminal transmits PUCCH Rep#2. Here, PUCCH Rep#2 contains the same UCI as PUCCH Rep#0 which is the first repetition. That is, PUCCH Rep#2 contains the HARQ-ACK of SPS0 which is not valid and the HARQ-ACK of SPS1 which is valid.

[0524] Referring to Fig. 51(b), the terminal is instructed to repeatedly transmit the HARQ-ACK of SPS0 and the HARQ-ACK of SPS1 in slot 2 and slot 3. Slot 2 is a DL slot and since PUCCH Rep#0 cannot be transmitted, PUCCH Rep#0 is transmitted in slot 4. Slot 3 is a DL slot and since PUCCH Rep#1 cannot be transmitted, PUCCH Rep#1 is transmitted in slot 6. In SPS PDSCH configuration #0, the maximum latency is Y 1,0 =1, and in SPS PDSCH configuration #1, the maximum latency is Y 1,1 =2. Here, the validity of the HARQ-ACK follows the aforementioned condition 2 (K def ≦Y) method. And K def is determined by the method of option 2.

[0525] According to the second embodiment, the terminal can determine the validity of the HARQ-ACK with PUCCH Rep#0 which is the first PUCCH repetition. Here, according to option 2, the slot (slot 2) indicated by PUCCH Rep#0 and the slot (slot 4) where PUCCH Rep#0 is actually transmitted are K def 2. The validity of the HARQ-ACK of SPS0 is that K def =2 and since Y0 = 1 and it is greater, it is not valid. Also, the validity of the HARQ-ACK of SPS1 is that K defSince =2 and Y1 is not greater than 2, it is valid. Therefore, the HARQ-ACK of SPS0 is not valid in PUCCH Rep#0, while the HARQ-ACK of SPS1 is valid. The terminal can send the valid HARQ-ACK information of SPS1 in PUCCH Rep#0. Subsequently, when the PUCCH repetition (PUCCH Rep#1) is transmitted, the HARQ-ACK information of SPS1 can be included in the transmission. However, the HARQ-ACK information of SPS0 is not transmitted (dropped).

[0526] Subsequently, whether the PUCCH repetition is transmitted or not is determined as follows. The terminal can determine the validity of HARQ-ACK in PUCCH Rep#1 to determine whether to transmit PUCCH Rep#1, which is the second PUCCH repetition. Here, K def The value of is, according to Option 2, the slot (Slot 3) where the transmission of PUCCH Rep#1 is indicated and the slot (Slot 6) where PUCCH Rep#1 is actually transmitted. Therefore, K def =3. The validity of the HARQ-ACK of SPS1 is that K def =3 and Y1 is greater than 2, so it is not valid. Therefore, since the HARQ-ACK of all SPSs is not valid in PUCCH Rep#1, PUCCH Rep#1 is not transmitted (dropped).

[0527] Example 3, Validity of HARQ-ACK: First Condition (K1 + K def ≤ Y) Method, K def : Option 1 Method

[0528] FIG. 52 illustrates a method by which a terminal determines the validity of HARQ-ACK according to yet another example.

[0529] Referring to FIG. 52(a), the terminal is instructed to repeatedly transmit the HARQ-ACK of SPS0 and the HARQ-ACK of SPS1 in Slots 2 and 3. Since Slot 3 is a DL slot and PUCCH Rep#1 cannot be transmitted, PUCCH Rep#1 is transmitted in Slot 5. In SPS PDSCH Configuration #0, the maximum delay time is Y1,0 = 4, and in SPS PDSCH configuration #1, the maximum delay time is Y 1,1 = 4. Here, the validity of HARQ-ACK follows the aforementioned condition 1 (K1 + K def ≤ Y) method. And K def is determined by the method of option 1.

[0530] According to the third embodiment, the terminal can determine the validity of HARQ-ACK in PUCCH Rep#1, which is the last PUCCH repetition. Here, the value of K def is determined by option 1. Since the slot where the first PUCCH transmission was instructed (slot 2) and the slot where PUCCH Rep#1 is actually transmitted (slot 5), K def = 3. The validity of HARQ-ACK of SPS0 is K 1,0 + K def = 5, which is greater than Y0 = 4, so it is not valid. Also, the validity of HARQ-ACK of SPS1 is K 1,1 + K def = 4, which is not greater than Y1 = 4, so it is valid. Therefore, in the last PUCCH repetition (PUCCH Rep#1), the HARQ-ACK of SPS0 is not valid, and the HARQ-ACK of SPS1 is valid. Therefore, it includes the HARQ-ACK of SPS1 that is valid in all PUCCH repetitions (PUCCH Rep#0, PUCCH Rep#1). However, the HARQ-ACK information of SPS0 is not transmitted (dropped).

[0531] Referring to FIG. 52(b), the terminal is instructed to repeatedly transmit the HARQ-ACK of SPS0 and the HARQ-ACK of SPS1 in slots 2 and 3. Slot 2 is a DL slot, and since PUCCH Rep#0 cannot be transmitted, PUCCH Rep#0 is transmitted in slot 5. Slot 3 is a DL slot, and since PUCCH Rep#1 cannot be transmitted, PUCCH Rep#1 is transmitted in slot 6. In SPS PDSCH configuration #0, the maximum delay time is Y 1,0 = 4, and in SPS PDSCH configuration #1, the maximum delay time is Y 1,1It is 4. Here, the validity of HARQ-ACK follows the aforementioned condition 1 (K1 + K def ≤ Y) method. And K def is determined by the method of Option 1.

[0532] According to the third embodiment, the terminal can determine the validity of HARQ-ACK in PUCCH Rep#1 which is the last PUCCH repetition. Here, the value of K def is determined by Option 1. Since the slot where the first PUCCH transmission is instructed (slot 2) and the slot where PUCCH Rep#1 is actually transmitted (slot 6), K def = 4. The validity of HARQ-ACK of SPS0 is K 1,0 + K def = 6, and since it is greater than Y0 = 4, it is not valid. Also, the validity of HARQ-ACK of SPS1 is K 1,1 + K def = 5, and since it is greater than Y1 = 4, it is not valid. Therefore, HARQ-ACK of SPS0 and SPS1 is not valid in the last PUCCH repetition (PUCCH Rep#1). That is, since there is no valid HARQ-ACK in the last PUCCH repetition (PUCCH Rep#1), all PUCCH repetitions (PUCCH Rep#0, PUCCH Rep#1) are not transmitted (dropped).

[0533] Third embodiment, validity of HARQ-ACK: First condition (K1 + K def ≤ Y) method, K def : Option 2 method

[0534] FIG. 53 illustrates a method by which a terminal determines the validity of HARQ-ACK according to still another example.

[0535] Referring to Fig. 53(a), the terminal is instructed to repeatedly transmit the HARQ-ACK of SPS0 and the HARQ-ACK of SPS1 in slot 2 and slot 3. Slot 3 is a DL slot, and since PUCCH Rep#1 cannot be transmitted, PUCCH Rep#1 is transmitted in slot 5. In SPS PDSCH configuration #0, the maximum delay time is Y 1,0 = 3, and in SPS PDSCH configuration #1, the maximum delay time is Y 1,1 = 3. Here, the validity of the HARQ-ACK follows the aforementioned condition 1 (K1 + K def ≦ Y) method. And K def is determined by the method of option 2.

[0536] According to the third embodiment, the terminal can determine the validity of the HARQ-ACK with PUCCH Rep#1, which is the last PUCCH repetition. Here, the value of K def is determined by option 2. Since the slot (slot 3) where the transmission of PUCCH Rep#1 is instructed and the slot (slot 5) where PUCCH Rep#1 is actually transmitted, K def is 2. The validity of the HARQ-ACK of SPS0 is K 1,0 + K def = 4, which is greater than Y0 = 3, so it is not valid. Also, the validity of the HARQ-ACK of SPS1 is K 1,1 + K def = 3, which is not greater than Y1 = 3, so it is valid. Therefore, in the last PUCCH repetition (PUCCH Rep#1), the HARQ-ACK of SPS0 is not valid, and the HARQ-ACK of SPS1 is valid. Therefore, the terminal includes the valid HARQ-ACK of SPS1 in all PUCCH repetitions (PUCCH Rep#0, PUCCH Rep#1). However, the HARQ-ACK information of SPS0 is not transmitted (dropped).

[0537] Referring to FIG. 53(b), the terminal is instructed to repeatedly transmit the HARQ-ACK of SPS0 and the HARQ-ACK of SPS1 in slot 2 and slot 3. Slot 2 is a DL slot, and since PUCCH Rep#0 cannot be transmitted, PUCCH Rep#0 is transmitted in slot 4. Slot 3 is a DL slot, and since PUCCH Rep#1 cannot be transmitted, PUCCH Rep#1 is transmitted in slot 6. In SPS PDSCH configuration #0, the maximum delay time is Y 1,0 =4, and in SPS PDSCH configuration #1, the maximum delay time is Y 1,1 =4. Here, the validity of the HARQ-ACK follows the aforementioned condition 1 (K1 + K def ≦Y) method. And K def is determined by the method of option 2.

[0538] According to the third embodiment, the terminal can determine the validity of the HARQ-ACK with PUCCH Rep#1, which is the last PUCCH repetition. Here, the value of K def is determined by option 2 to be the slot (slot 3) where the transmission of PUCCH Rep#1 is instructed and the slot (slot 6) where PUCCH Rep#1 is actually transmitted. So, K def =3. The validity of the HARQ-ACK of SPS0 is K 1,0 +K def =5, which is greater than Y0 = 3, so it is not valid. Also, the validity of the HARQ-ACK of SPS1 is K 1,1 +K def =4, which is greater than Y1 = 3, so it is not valid. Therefore, the HARQ-ACK of SPS0 and the HARQ-ACK of SPS1 are not valid in the last PUCCH repetition (PUCCH Rep#1). Therefore, since there is no valid HARQ-ACK in the last PUCCH repetition (PUCCH Rep#1), the terminal does not transmit (drop) all PUCCH repetitions (PUCCH Rep#0, PUCCH Rep#1).

[0539] Third Embodiment, Validity of HARQ-ACK: Second Condition (K def ≦Y) Method, K def: Option 1 Method

[0540] FIG. 54 illustrates a method by which a terminal determines the validity of HARQ-ACK according to still another example.

[0541] Referring to FIG. 54(a), the terminal is instructed to repeatedly transmit the HARQ-ACK of SPS0 and the HARQ-ACK of SPS1 in slot 2 and slot 3. Slot 3 is a DL slot, and since PUCCH Rep#1 cannot be transmitted, PUCCH Rep#1 is transmitted in slot 5. In SPS PDSCH configuration #0, the maximum delay time is Y 1,0 = 2, and in SPS PDSCH configuration #1, the maximum delay time is Y 1,1 = 3. Here, the validity of HARQ-ACK follows the aforementioned condition 2 (K def ≤ Y) method. And K def is determined by the method of Option 1.

[0542] According to the third embodiment, the terminal can determine the validity of HARQ-ACK with PUCCH Rep#1, which is the last PUCCH repetition. Here, the value of K def is, according to Option 1, the slot (slot 2) in which the transmission of the first PUCCH is instructed and the slot (slot 5) in which PUCCH Rep#1 is actually transmitted. So, K def = 3. The validity of the HARQ-ACK of SPS0 is that K def = 3 and it is not valid because it is greater than Y0 = 2. Also, the validity of the HARQ-ACK of SPS1 is that K def = 3 and it is valid because it is not greater than Y1 = 3. Therefore, in the last PUCCH repetition (PUCCH Rep#1), the HARQ-ACK of SPS0 is not valid and the HARQ-ACK of SPS1 is valid. Therefore, the terminal includes the valid HARQ-ACK of SPS1 in all PUCCH repetitions (PUCCH Rep#0, PUCCH Rep#1). However, the HARQ-ACK information of SPS0 is not transmitted (dropped).

[0543] Referring to FIG. 54(b), the terminal is instructed to repeatedly transmit the HARQ-ACK of SPS0 and the HARQ-ACK of SPS1 in slot 2 and slot 3. Slot 2 is a DL slot, and since PUCCH Rep#0 cannot be transmitted, PUCCH Rep#0 is transmitted in slot 5. Slot 3 is a DL slot, and since PUCCH Rep#1 cannot be transmitted, PUCCH Rep#1 is transmitted in slot 6. In SPS PDSCH configuration #0, the maximum delay time is Y 1,0 =2, and in SPS PDSCH configuration #1, the maximum delay time is Y 1,1 =3. Here, the validity of the HARQ-ACK follows the aforementioned condition 2 (K def ≦Y) method. And K def is determined by the method of option 1.

[0544] According to the third embodiment, the terminal can determine the validity of the HARQ-ACK with PUCCH Rep#1, which is the last PUCCH repetition. Here, the value of K def is determined by option 1. The slot where the transmission of the first PUCCH is instructed (slot 2) and the slot where PUCCH Rep#1 is actually transmitted (slot 6), so K def =4. The validity of the HARQ-ACK of SPS0 is K def =4, and since it is greater than Y0 = 2, it is not valid. Also, the validity of the HARQ-ACK of SPS1 is K def =4, and since it is greater than Y1 = 3, it is not valid. Therefore, the HARQ-ACK of SPS0 and the HARQ-ACK of SPS1 are not valid in the last PUCCH repetition (PUCCH Rep#1). That is, since there is no valid HARQ-ACK in the last PUCCH repetition (PUCCH Rep#1), the terminal does not transmit (drops) all PUCCH repetitions (PUCCH Rep#0, PUCCH Rep#1).

[0545] Third embodiment, validity of HARQ-ACK: Second condition (K def ≦Y) method, K def : Option 2 method

[0546] FIG. 55 illustrates a method by which a terminal determines the validity of HARQ-ACK according to still another example.

[0547] Referring to FIG. 55(a), the terminal is instructed to repeatedly transmit the HARQ-ACK of SPS0 and the HARQ-ACK of SPS1 in slot 2 and slot 3. Slot 3 is a DL slot and PUCCH Rep#1 cannot be transmitted, so PUCCH Rep#1 is transmitted in slot 5. In SPS PDSCH configuration #0, the maximum delay time is Y 1,0 = 1, and in SPS PDSCH configuration #1, the maximum delay time is Y 1,1 = 2. Here, the validity of HARQ-ACK follows the aforementioned condition 2 (K def ≤ Y). And K def is determined by the method of option 2.

[0548] According to the third embodiment, the terminal can determine the validity of HARQ-ACK with PUCCH Rep#1 which is the last PUCCH repetition. Here, the value of K def is, according to option 2, the slot (slot 3) in which the transmission of PUCCH Rep#1 is instructed and the slot (slot 5) in which PUCCH Rep#1 is actually transmitted. So K def is 2. The validity of the HARQ-ACK of SPS0 is that K def = 2 and since Y0 = 1 is greater, it is not valid. Also, the validity of the HARQ-ACK of SPS1 is that K def = 2 and since it is not greater than Y1 = 2, it is valid. Therefore, in the last PUCCH repetition (PUCCH Rep#1), the HARQ-ACK of SPS0 is not valid and the HARQ-ACK of SPS1 is valid. That is, the terminal includes the valid HARQ-ACK of SPS1 in all PUCCH repetitions (PUCCH Rep#0, PUCCH Rep#1). However, the HARQ-ACK information of SPS0 is not transmitted (dropped).

[0549] Referring to FIG. 55(b), the terminal is instructed to repeatedly transmit the HARQ-ACK of SPS0 and the HARQ-ACK of SPS1 in slot 2 and slot 3. Slot 2 is a DL slot, and since PUCCH Rep#0 cannot be transmitted, PUCCH Rep#0 is transmitted in slot 4. Slot 3 is a DL slot, and since PUCCH Rep#1 cannot be transmitted, PUCCH Rep#1 is transmitted in slot 6.

[0550] In SPS PDSCH configuration #0, the maximum latency is Y 1,0 = 1, and in SPS PDSCH configuration #1, the maximum latency is Y 1,1 = 2. Here, the validity of the HARQ-ACK follows the aforementioned condition 2 (K def ≤ Y) method. And K def is determined by the method of option 2.

[0551] According to the third embodiment, the terminal can determine the validity of the HARQ-ACK with PUCCH Rep#1 which is the last PUCCH repetition. Here, the value of K def is determined by option 2, and the slot (slot 3) where the transmission of PUCCH Rep#1 is instructed and the slot (slot 6) where PUCCH Rep#1 is actually transmitted, so K def = 3. The validity of the HARQ-ACK of SPS0 is K def = 3, and since it is greater than Y0 = 1, it is not valid. Also, the validity of the HARQ-ACK of SPS1 is K def = 3, and since it is greater than Y1 = 2, it is not valid. Therefore, the HARQ-ACK of SPS0 and the HARQ-ACK of SPS1 are not valid in the last PUCCH repetition (PUCCH Rep#1). That is, since there is no valid HARQ-ACK in the last PUCCH repetition (PUCCH Rep#1), the terminal does not transmit (drop) all PUCCH repetitions (PUCCH Rep#0, PUCCH Rep#1).

[0552] In the examples for explaining the above-described First to Third Embodiments, SPS0 of SPS PDSCH configuration #0 and SPS1 of SPS PDSCH configuration #1 are instructed to transmit HARQ-ACK in the same slot. However, the HARQ-ACKs of SPS0 and SPS1 may be instructed to be transmitted in different slots. In this case, when the PUCCH on which the HARQ-ACK is transmitted is repeatedly transmitted in a plurality of slots, they may overlap in some slots. In this case, the terminal needs a method for transmitting the PUCCH in the some slots.

[0553] FIG. 56 is a diagram for explaining a method by which a terminal performs PUCCH repetition according to an example.

[0554] Referring to FIG. 56, the terminal is set to receive SPS0 of SPS PDSCH configuration #0 in slot 0, and is set to receive SPS1 of SPS PDSCH configuration #1 in slot 4. In SPS PDSCH configuration #0, K 1,0 = 2 is set, and in SPS PDSCH configuration #1, K 1,1 = 1 is set. Therefore, the terminal must transmit the HARQ-ACK of SPS0 in slot 0 in slot 2, and transmit the HARQ-ACK of SPS1 in slot 4 in slot 5. When transmitting the HARQ-ACK in slot 2, the PUCCH can be repeatedly transmitted in two slots. Here, the slots in which transmission is instructed are slot 2 and slot 3.

[0555] Slot 3 is a DL slot, and since PUCCH cannot be transmitted, PUCCH is transmitted in slot 5. Therefore, the PUCCH for transmitting the HARQ-ACK of SPS0 is transmitted in slot 2 (PUCCH Rep#0 for SPS0) and slot 5 (PUCCH Rep#1 for SPS0). When transmitting the HARQ-ACK in slot 5, the PUCCH can be repeatedly transmitted in two slots. Here, the slots indicated for transmission are slot 5 and slot 6. Since slot 5 and slot 6 are UL slots, the PUCCH for transmitting the HARQ-ACK of SPS1 is transmitted in slot 5 (PUCCH Rep#0 for SPS1) and slot 6 (PUCCH Rep#1 for SPS1).

[0556] There may be an overlap between the second repetition of the PUCCH for transmitting the HARQ-ACK of SPS0 and the first repetition of the PUCCH for transmitting the HARQ-ACK of SPS1 in slot 5. The terminal cannot transmit both PUCCHs simultaneously in one slot and must solve this overlapping problem. A specific method for this is disclosed.

[0557] As a first method, the terminal may transmit the repetition of the PUCCH that started earlier and does not need to transmit the PUCCH that started later (drop). This does not distinguish whether the PUCCH that started earlier is the one transmitted in the slot indicated for transmission or the extended PUCCH.

[0558] As a second method, the terminal may transmit the repetition of the PUCCH that started later and does not need to transmit the PUCCH that started earlier (drop). This means that the transmission of the PUCCH that started earlier may be performed before colliding with other PUCCH repetitions.

[0559] As a third method, the terminal can preferentially transmit the PUCCH repetition in the slot in which transmission is indicated. That is, when the PUCCH repetition in the slot in which transmission is indicated and the extended PUCCH repetition that is not indicated for transmission overlap, the terminal can transmit the PUCCH repetition in the slot in which transmission is indicated and does not have to transmit the extended PUCCH repetition (drop). If both of the PUCCHs overlapping in one slot are repetitions of the PUCCH for which transmission is indicated (i.e., PUCCH not extended), then among the two PUCCHs, the terminal can transmit the PUCCH that started first and does not have to transmit the PUCCH that started later. If neither of the PUCCHs overlapping in one slot is a repetition of the PUCCH for which transmission is indicated (i.e., extended PUCCH), then among the two PUCCHs, the terminal can transmit the PUCCH that started first and does not have to transmit the PUCCH that started later.

[0560] As a fourth method, the terminal can transmit the PUCCH repetition corresponding to the smaller number of repetition times among the repetition of the PUCCH that started first and the repetition of the PUCCH that started later. For example, compare the number of repetitions when transmitting the repetition of the PUCCH that started first (here, including the PUCCH that does not repeat. At this time, assume the number of repetitions is 1) and the number of repetitions when transmitting the repetition of the PUCCH that started later, and the terminal can transmit the PUCCH repetition corresponding to the smaller number of PUCCH repetitions between the two. If the PUCCH to be transmitted first has a repetition number of 1, then the repetition of the PUCCH to be transmitted first is a smaller number, so the PUCCH can be transmitted. In this way, by relatively increasing the transmission of the PUCCH repetitions with a smaller number, the performance degradation of the PUCCH can be suppressed.

[0561] In the first to fourth methods, the terminal does not transmit at least one PUCCH repetition transmission. Therefore, performance degradation cannot be avoided due to the non-transmitted PUCCH repetition transmission. A fifth method for solving this is disclosed.

[0562] As a fifth method of the present invention, the terminal can transmit in the overlapping slots of the previously started PUCCH repetition, and does not transmit the PUCCH repetition started later in the overlapping slots, but can extend it to the slots where subsequent transmissions are possible. That is, when selecting a slot in which PUCCH repetition is possible, the terminal may exclude the slot in which the previously started PUCCH repetition starts. That is, the terminal can select a slot for repeating the PUCCH from among the slots in which the previously started PUCCH repetition is not transmitted.

[0563] FIG. 57 is a diagram for explaining a method by which a terminal performs PUCCH repetition according to another example.

[0564] Referring to FIG. 57, when PUCCH Rep#1 for SPS0 and PUCCH Rep#0 for SPS1 collide in slot 5, the terminal can transmit the previously started PUCCH Rep#1 for SPS0 in slot 5. And PUCCH Rep#0 for SPS1 not transmitted in slot 5 can be transmitted in slots after slot 5. Here, since transmission is possible in slot 6 and slot 7, PUCCH Rep#0 for SPS1 may be transmitted in slot 6 and PUCCH Rep#1 for SPS1 may be transmitted in slot 7.

[0565] In the fifth method, when a collision occurs, the terminal transmits the later-started PUCCH repetition extended to subsequent slots, so that there is no case where PUCCH repetition transmission is not performed. Therefore, there is no deterioration in the performance of the PUCCH. However, since the later-started PUCCH repetition is extended to subsequent slots, a delay in the PUCCH may occur. A sixth method for solving this is disclosed.

[0566] As a sixth method of the present invention, the terminal does not transmit in a slot where the repetitions of the previously started PUCCH overlap. Instead, the HARQ-ACK transmitted in the repetitions of the previously started PUCCH can be included and transmitted in the PUCCH repetitions that start later. For example, in FIG. 56, when PUCCH Rep#1 for SPS0 and PUCCH Rep#0 for SPS1 overlap in slot 5, the terminal does not transmit the previously started PUCCH Rep#1 for SPS0. Then, the HARQ-ACK of SPS0 transmitted in PUCCH Rep#1 for SPS0 can be included and transmitted in PUCCH Rep#0 for SPS1. That is, PUCCH Rep#0 for SPS1 may include not only the HARQ-ACK information of SPS1 but also the HARQ-ACK information of SPS0.

[0567] The above description of the present invention is for illustrative purposes, and those with ordinary knowledge in the technical field to which the present invention pertains can understand that it can be easily transformed into other specific forms without changing the technical idea and essential features of the present invention. Therefore, the above-described embodiments should be understood as illustrative and non-limiting in any aspect. For example, each component described as a single type may be implemented distributively, and similarly, components described as being distributed may also be implemented in a combined form.

[0568] The scope of the present invention should be represented by the claims described later rather than the above detailed description, and all changes or modified forms derived from the meaning and scope of the claims and their equivalent concepts should be construed as being included in the scope of the present invention.

Claims

1. A terminal configured to operate in a wireless communication system, the terminal comprising: a processor; a communication module; wherein the processor is configured to: receive a semi-persistent scheduling physical downlink shared channel (SPS PDSCH) based on an SPS setting, each of the SPS settings including a respective maximum delay time; determine a first physical uplink control channel (PUCCH) resource for transmitting first hybrid automatic repeat request acknowledgment (HARQ-ACK) information related to the SPS PDSCH, the first HARQ-ACK information including second HARQ-ACK information; if the first PUCCH resource overlaps with at least one of a semi-static downlink symbol, a symbol for a synchronization signal / physical broadcast channel (SSB), or a symbol for a control resource set #0 (CORESET#0), defer transmission of the second HARQ-ACK information to a second PUCCH resource; and is configured as follows: the second HARQ-ACK information corresponds to one or more SPS settings, each of the one or more SPS settings having a maximum delay time greater than a time difference between a slot of the second PUCCH resource and a slot of reception of a corresponding SPS PDSCH; a terminal.

2. Said deferring the transmission of the second HARQ-ACK information comprises: - if a first earliest available PUCCH resource in which the second HARQ-ACK information can be multiplexed, which occurs after the first PUCCH resource, is available for transmission, using the first earliest available PUCCH resource as the second PUCCH resource; - if the first earliest available PUCCH resource is not available for transmission due to an overlap with at least one of the semi-static downlink symbol, the symbol for the SSB, or the symbol for the CORESET#0, determining a second earliest available PUCCH resource in which the second HARQ-ACK information can be multiplexed; The terminal according to claim 1, comprising.

3. The second PUCCH resource is allocated to either a primary cell or a secondary cell based on a periodic cell switching pattern set by a bitmap of a radio resource control (RRC) signal. Each bit of the bitmap corresponds to a respective slot with reference to the numerology of the primary cell, and each bit value of the bitmap indicates either the primary cell or the secondary cell as a cell for PUCCH transmission in the corresponding slot. The terminal according to claim 1 or 2.

4. A method executed by a terminal in a wireless communication system, the method comprising: Receiving a semi-persistent scheduling physical downlink shared channel (SPS PDSCH) based on an SPS configuration, each of the SPS configurations including a respective maximum delay time; Determining a first physical uplink control channel (PUCCH) resource for transmitting first hybrid automatic repeat request acknowledgement (HARQ-ACK) information related to the SPS PDSCH, the first HARQ-ACK information including second HARQ-ACK information; When the first PUCCH resource overlaps at least one of a semi-static downlink symbol, a symbol for a synchronization signal / physical broadcast channel (SSB), or a symbol for a control resource set #0 (CORESET #0), deferring transmission of the second HARQ-ACK information to a second PUCCH resource; The second HARQ-ACK information corresponds to one or more SPS configurations, each of the one or more SPS configurations having a maximum delay time greater than a time difference between a slot of the second PUCCH resource and a slot of reception of the corresponding SPS PDSCH.

5. Deferring the transmission of the second HARQ-ACK information - If the earliest first PUCCH resource on which the second HARQ-ACK information can be multiplexed and which occurs after the first PUCCH resource is available for transmission, the earliest first PUCCH resource is used as the second PUCCH resource. - If the first earliest PUCCH resource is not valid for transmission due to overlap with at least one of the semi-static downlink symbol, the symbol for the SSB, or the symbol for the CORESET #0, determining a second earliest PUCCH resource on which the second HARQ-ACK information can be multiplexed The method according to claim 4, comprising: **Claim 6** The second PUCCH resource is assigned to either a primary cell or a secondary cell based on a periodic cell switching pattern set by a bitmap of radio resource control (RRC) signals, Each bit of the bitmap corresponds to a respective slot with reference to the numerology of the primary cell, and each bit value of the bitmap indicates either the primary cell or the secondary cell as the cell for PUCCH transmission in the corresponding slot. The method according to claim 4 or 5. **Claim 7** A base station (BS) operating in a wireless communication system, the base station comprising: a processor; a communication module; The processor is configured to: Transmit a semi-persistent scheduling physical downlink shared channel (SPS PDSCH) based on SPS settings, each of the SPS settings including a respective maximum delay time, Determine a first physical uplink control channel (PUCCH) resource for receiving first hybrid automatic repeat request acknowledgement (HARQ-ACK) information related to the SPS PDSCH, the first HARQ-ACK information including second HARQ-ACK information, If the first PUCCH resource overlaps with at least one of a semi-static downlink symbol, a symbol for a synchronization signal / physical broadcast channel (SSB), or a symbol for a control resource set #0 (CORESET #0), deferring reception of the second HARQ-ACK information to a second PUCCH resource, configured as such, The second HARQ-ACK information corresponds to one or more SPS settings, each of the one or more SPS settings having a maximum delay time greater than or equal to a time difference between the slot of the second PUCCH resource and the slot of transmission of the corresponding SPS PDSCH. A base station. **Claim 8** Delaying the reception of the second HARQ-ACK information includes: - If the first earliest PUCCH resource that occurs after the first PUCCH resource and on which the second HARQ-ACK information can be multiplexed is valid for reception, using the first earliest PUCCH resource as the second PUCCH resource; - If the first earliest PUCCH resource is not valid for reception due to overlapping with at least one of the semi-static downlink symbol, the symbol for the SSB, or the symbol for the CORESET #0, determining a second earliest PUCCH resource on which the second HARQ-ACK information can be multiplexed. The base station according to claim 7, comprising the above.

9. The second PUCCH resource is assigned to either a primary cell or a secondary cell based on a periodic cell switching pattern set by a bitmap of radio resource control (RRC) signals. Each bit of the bitmap corresponds to each slot with reference to the numerology of the primary cell, and each bit value of the bitmap indicates either the primary cell or the secondary cell as the cell for PUCCH transmission in the corresponding slot. The base station according to claim 7 or 8.

10. A method performed by a base station (BS) in a wireless communication system, the method comprising: Transmitting a semi-persistent scheduling physical downlink shared channel (SPS PDSCH) based on SPS settings, each of the SPS settings including a respective maximum delay time; Determining a first physical uplink control channel (PUCCH) resource for receiving first hybrid automatic repeat request acknowledgment (HARQ-ACK) information related to the SPS PDSCH, the first HARQ-ACK information including second HARQ-ACK information. When the first PUCCH resource overlaps at least one of a semi-static downlink symbol, a symbol for a synchronization signal / physical broadcast channel (SSB), or a symbol for a control resource set #0 (CORESET #0), delaying reception of the second HARQ-ACK information to a second PUCCH resource. The second HARQ-ACK information corresponds to one or more SPS settings, and each of the one or more SPS settings has a maximum delay time greater than or equal to a time difference between a slot of the second PUCCH resource and a slot of transmission of a corresponding SPS PDSCH. **Claim 11** Delaying the reception of the second HARQ-ACK information includes: - When a first earliest PUCCH resource in which the second HARQ-ACK information can be multiplexed and that occurs after the first PUCCH resource is valid for reception, using the first earliest PUCCH resource as the second PUCCH resource. - When the first earliest PUCCH resource is not valid for reception due to an overlap with at least one of the semi-static downlink symbol, the symbol for the SSB, or the symbol for the CORESET #0, determining a second earliest PUCCH resource in which the second HARQ-ACK information can be multiplexed. The method according to claim 10, including the above. **Claim 12** The second PUCCH resource is assigned to either a primary cell or a secondary cell based on a periodic cell switching pattern set by a bitmap of a radio resource control (RRC) signal. Each bit of the bitmap corresponds to each slot with reference to the numerology of the primary cell, and each bit value of the bitmap indicates either the primary cell or the secondary cell as a cell for PCCCH transmission in the corresponding slot. The method according to claim 10 or 11.

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